CN113251029B - Hydraulic control system and method for adjusting roller press - Google Patents
Hydraulic control system and method for adjusting roller press Download PDFInfo
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- CN113251029B CN113251029B CN202110713865.2A CN202110713865A CN113251029B CN 113251029 B CN113251029 B CN 113251029B CN 202110713865 A CN202110713865 A CN 202110713865A CN 113251029 B CN113251029 B CN 113251029B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 206
- 238000001125 extrusion Methods 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims description 24
- 230000001276 controlling effect Effects 0.000 claims description 12
- 230000002035 prolonged effect Effects 0.000 abstract description 6
- 239000000463 material Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- 239000013072 incoming material Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/02—Servomotor systems with programme control derived from a store or timing device; Control devices therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C4/00—Crushing or disintegrating by roller mills
- B02C4/28—Details
- B02C4/32—Adjusting, applying pressure to, or controlling the distance between, milling members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/08—Assemblies of units, each for the control of a single servomotor only
- F15B13/0803—Modular units
- F15B13/0846—Electrical details
- F15B13/085—Electrical controllers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
- F15B13/08—Assemblies of units, each for the control of a single servomotor only
- F15B13/0803—Modular units
- F15B13/0846—Electrical details
- F15B13/086—Sensing means, e.g. pressure sensors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
- F15B2013/0448—Actuation by solenoid and permanent magnet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/63—Electronic controllers
- F15B2211/6303—Electronic controllers using input signals
- F15B2211/6306—Electronic controllers using input signals representing a pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/665—Methods of control using electronic components
- F15B2211/6656—Closed loop control, i.e. control using feedback
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Paper (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses a hydraulic control system and a hydraulic control method for regulating a roller press, which relate to the field of hydraulic pressure, and are characterized in that the working state of the roller press is monitored in real time through a data acquisition unit, once the inclination of a roller gap between two extrusion rollers is monitored, a control unit can control an oil pump to convey oil to a rod cavity of a transmission side oil cylinder, the pressure P1 of a transmission side hydraulic control oil way is increased, the roller gap width b1 of the transmission side is increased, and finally, the roller press is ensured to work under the state of constant pressure and constant roller gap all the time, so that the roller press can be stably produced, a bearing and the hydraulic control oil way are protected, and the service life of the roller press can be effectively prolonged.
Description
Technical Field
The invention relates to the field of hydraulic pressure, in particular to a hydraulic control system and a hydraulic control method suitable for adjustment of a roller press and a high-pressure roller mill in building materials and mining industries.
Background
The roller press (also called as high-pressure roller mill) is composed of two extrusion rollers which rotate synchronously in opposite directions, one is a fixed roller and the other is a movable roller, and materials are crushed by the pressure between the two rollers through the gap between the fixed roller and the movable roller of the roller press. When the roller press works, in order to ensure that the extrusion force to materials is not reduced, a rod cavity of an oil cylinder of the roller press is connected with an oil tank, oil in the rod cavity is discharged into the oil tank, the rod cavity is basically pressureless, a piston in the oil cylinder extends out of the oil cylinder by virtue of an accumulator, the materials pass through a roller gap, and the piston is retracted into the oil cylinder by extruding the roller. When the incoming materials are uneven or broken in production, the widths of the roll gaps on the transmission side and the non-transmission side of the extrusion roll are different, and the pressure difference is large. As can be seen from fig. 1, b1 is smaller than b2 (b 2 is the width of the roll gap on the non-transmission side, b1 is the width of the roll gap on the transmission side), the material input on the transmission side is small, the roll gap change is small, and the rising amplitude of P1 (P1 is the pressure of the rodless cavity of the oil cylinder on the transmission side) is small; the feeding of the non-transmission side is large, the roll gap change is large, and the rising amplitude of P2 (P2 is the pressure of the rodless cavity of the non-transmission side oil cylinder) is large. At this time, the gap between b1 and b2 becomes larger, and in the past, two squeeze rolls rotate under the state that the axis is not parallel to squeeze materials, can lead to uneven bearing stress, influence the life of roll squeezer, increase manufacturing cost.
In the whole production process, oil is not contained in the rod cavity all the time and is not pressed, and only when the roll gap is pulled, the oil can enter the rod cavity to pull the roll gap. When the roll squeezer works normally, two methods for adjusting the roll gap exist, as shown in fig. 1, firstly, the roll gap width b2 at the non-transmission side is reduced by improving P2 through a hydraulic control system, but P2 is larger than P1 when the roll gap is inclined, the pressure difference between P2 and P1 is larger by improving P2 again, the hydraulic control system is damaged by the excessive pressure difference, and the method is not allowed in actual production; secondly, P1 is reduced by the hydraulic control system, the roll gap width b1 at the transmission side can be increased under the extrusion of materials, and the pressure difference between P2 and P1 can be increased by the method. Therefore, the constant roll gap (b1≡b2) cannot be achieved by the existing method, and the pressures are basically equal (P1≡P2).
Disclosure of Invention
The invention aims at: according to the hydraulic control system for adjusting the roller press, the working state of the roller press is monitored in real time through the data acquisition unit, once the inclination of the roller gap between the two extrusion rollers is monitored, the control unit can control the oil pump to convey oil to the rod cavity of the transmission side oil cylinder, the pressure P1 of the transmission side hydraulic control oil way is increased, the roller gap width b1 of the transmission side is increased, the roller press is finally ensured to work under the state of constant pressure and constant roller gap all the time, so that the roller press can be stably produced, the bearing and the hydraulic control oil way are protected, and the service life of the roller press can be effectively prolonged.
The technical scheme adopted by the invention is as follows:
the hydraulic control system for adjusting the roller press comprises an energy accumulator, an oil cylinder, an oil pump and a squeeze roller, wherein the oil pump is connected with a rod cavity of the oil cylinder to form a control oil way, a rodless cavity of the oil cylinder is connected with the oil pump to form an adjusting oil way, a first electromagnetic reversing valve is arranged on the control oil way, the energy accumulator is arranged between the first electromagnetic reversing valve and the rodless cavity of the oil cylinder, a second electromagnetic reversing valve is arranged on the adjusting oil way, a piston of the oil cylinder is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil way and the control oil way are matched to form a hydraulic control oil way; the hydraulic control oil way of the oil cylinder at the transmission side of the control squeeze roller is a hydraulic control oil way at the transmission side, the hydraulic control oil way of the oil cylinder at the non-transmission side of the control squeeze roller is a hydraulic control oil way at the non-transmission side, and the hydraulic control oil way control device further comprises a data acquisition unit, a data processing unit and a control unit, wherein the data acquisition unit is in signal connection with the data processing unit, the data processing unit is in signal connection with the control unit, and the second electromagnetic reversing valve is in signal connection and is controlled by the control unit; the data acquisition unit acquires operation data of the transmission side and the non-transmission side of the squeeze roller, the data processing unit judges whether the squeeze roller needs to be regulated according to the data acquired by the data acquisition unit, and the control unit controls a second electromagnetic reversing valve and an oil pump of a hydraulic control oil circuit of the transmission side according to a judging result of the data processing unit; when the second electromagnetic directional valve of the transmission side hydraulic control oil circuit is powered on, the oil pump is communicated with the rod cavity of the oil cylinder through the second electromagnetic directional valve and conveys oil to the rod cavity, and the pressure and the roll gap width of the transmission side of the squeeze roll are adjusted.
By adopting the technical scheme, the working state of the roller press is monitored in real time through the data acquisition unit, once the inclination of the roll gap between the two extrusion rollers is monitored, the control unit can send control signals to the second electromagnetic reversing valve of the hydraulic control oil way at the transmission side and the oil pump, the second electromagnetic reversing valve is electrified, the oil pump is communicated with the rod cavity of the oil cylinder, the oil pump works to convey oil to the rod cavity, the pressure P1 of the hydraulic control oil way at the transmission side rises, the roll gap width b1 at the transmission side becomes larger, and finally, the pressure at the transmission side and the non-transmission side of the roller press is basically equal when the roll gap width at the transmission side and the non-transmission side of the roller press is basically equal, so that the roller press can be stably produced, the bearing and the hydraulic control oil way are protected, and the service life of the roller press can be effectively prolonged.
Further, a pressure relief oil way is arranged on the regulating oil way, one end of the pressure relief oil way is connected with a rod cavity of the oil cylinder through a second electromagnetic directional valve, the other end of the pressure relief oil way is connected with the oil tank, and when the second electromagnetic directional valve is not powered, the oil in the rod cavity flows back to the oil tank along the pressure relief oil way through the second electromagnetic directional valve.
By adopting the technical scheme, after the oil in the rod cavity is used for adjusting the roll gap, the second electromagnetic directional valve is not electrified under the control of the control unit, the pressure relief oil way is communicated with the rod cavity of the oil cylinder through the second electromagnetic directional valve, the oil in the rod cavity flows back to the oil tank from the oil pressure relief oil way, the pressure relief of the rod cavity is completed, and the roll squeezer returns to a normal working state.
Further, an overflow oil return path is arranged between the second electromagnetic reversing valve and a rod cavity of the oil cylinder, the overflow oil return path is connected with the oil tank through the overflow valve, after the pressure of the rod cavity reaches a threshold value, the overflow valve is opened, and oil in the rod cavity flows back to the oil tank through the overflow valve.
By adopting the technical scheme, the overflow oil return channel is arranged to protect the oil cylinder, if the pressure of the oil cylinder is too high, the overflow valve is automatically opened, the oil with the rod cavity flows back to the oil tank through the overflow valve, and the pressure of the oil cylinder is removed.
Further, the data acquisition unit comprises a pressure sensor, and the pressure sensor at least acquires the pressure P1 of the rodless cavity of the oil cylinder at the transmission side of the squeeze roller and the pressure P2 of the rodless cavity of the oil cylinder at the non-transmission side.
By adopting the technical scheme, the pressure P1 of the rodless cavity of the oil cylinder at the transmission side of the squeeze roller and the pressure P2 of the rodless cavity of the oil cylinder at the non-transmission side are collected through the pressure sensor, when the difference value between the pressure P2 and the pressure P1 is larger than or equal to the set pressure threshold value delta P, the control unit sends control signals to the second electromagnetic directional valve of the hydraulic control oil way at the transmission side and the oil pump, the oil pump works and conveys oil to the rod cavity through the second electromagnetic directional valve, the pressure P1 of the hydraulic control oil way at the transmission side rises, the width b1 of the roller gap at the transmission side becomes larger, and when the pressure P2 is equal to the pressure P1, the adjustment is completed, namely, the hydraulic control system adjusts the roller gap in a constant pressure mode.
Further, the pressure sensor is arranged between the energy accumulator and the rodless cavity of the oil cylinder, and collects the pressure of the rodless cavity of the oil cylinder; the pressure sensor is in signal connection with the data processing unit, and pressure data of the rodless cavity of the oil cylinder is transmitted between the pressure sensor and the data processing unit.
By adopting the technical scheme, after the pressure sensor collects the pressure P1 and the pressure P2, data are sent to the data processing unit, the data processing unit calculates the difference value between the pressure P2 and the pressure P1, judges whether the difference value is greater than or equal to a set threshold value, sends the judging result to the control unit, and the control unit regulates and controls the roller press according to the judging result, so that the roller press always works under the state of constant pressure and constant roller gap.
Further, the data acquisition unit comprises a displacement sensor, wherein the displacement sensor is used for acquiring at least the roll gap width b1 of the transmission side and the roll gap width b2 of the non-transmission side of the squeeze roll; the displacement sensor is in signal connection with the data processing unit, and data of the roll gap width are transmitted between the displacement sensor and the data processing unit.
By adopting the technical scheme, the roll gap width b1 of the extrusion roll on the transmission side and the roll gap width b2 of the extrusion roll on the non-transmission side are collected through the displacement sensor and sent to the data processing unit, the data processing unit calculates the difference value between the roll gap width b2 and the roll gap width b1, judges whether the difference value is larger than or equal to a set threshold value, and sends the judging result to the control unit, when the difference value is larger than or equal to the set roll gap threshold value delta b, the control unit sends control signals to the second electromagnetic reversing valve and the oil pump of the hydraulic control oil circuit on the transmission side, the oil pump works, oil is conveyed to the rod cavity through the second electromagnetic reversing valve, the pressure P1 of the hydraulic control oil circuit on the transmission side is increased, the roll gap width b1 on the transmission side is increased, and when the roll gap width b2 is equal to the roll gap width b1, adjustment is completed, namely the hydraulic control system adjusts the roll gap in a constant roll gap mode, and the roll press is ensured to always keep working under a constant pressure and constant roll gap state.
Correspondingly, the invention also discloses a hydraulic control method which is applied to a hydraulic control system of the roller press, wherein the hydraulic control system of the roller press comprises an energy accumulator, an oil cylinder, an oil pump and a squeeze roller, wherein a rod cavity of the oil pump is connected with the oil cylinder to form a control oil way, a rodless cavity of the oil cylinder is connected with the oil pump to form an adjusting oil way, a first electromagnetic reversing valve is arranged on the control oil way, the energy accumulator is arranged between the first electromagnetic reversing valve and the rodless cavity of the oil cylinder, a second electromagnetic reversing valve is arranged on the adjusting oil way, a piston of the oil cylinder is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil way is matched with the control oil way to form a hydraulic control oil way; the hydraulic control oil way for controlling the squeeze roller transmission side oil cylinder is a transmission side hydraulic control oil way, and the hydraulic control oil way for controlling the squeeze roller non-transmission side oil cylinder is a non-transmission side hydraulic control oil way; the method is characterized by comprising the following steps of:
The acquisition step: the operation data of the transmission side and the non-transmission side of the squeeze roller are collected through the collecting unit, and the collected data are sent to the data processing unit for processing;
judging: setting a threshold value, calculating a difference value of operation data of a non-transmission side and a transmission side by a data processing unit, judging whether the difference value is larger than or equal to the threshold value, and sending a judging result to a control unit by the data processing unit;
The control step: when the judging result received by the control unit is that the difference value is smaller than the threshold value, the second electromagnetic directional valve of the transmission side hydraulic control oil way is not powered on, the rod cavity of the oil cylinder is oilless and pressureless, when the judging result received by the control unit is that the difference value is larger than or equal to the threshold value, the control unit controls the second electromagnetic directional valve of the transmission side hydraulic control oil way to be powered on, the oil pump is communicated with the rod cavity of the oil cylinder through the second electromagnetic directional valve and conveys oil to the rod cavity, and when the difference value of the non-transmission side and transmission side operation data received by the control unit is 0, the control unit conveys a control signal to the second electromagnetic directional valve of the transmission side hydraulic control oil way to enable the second electromagnetic directional valve to be not powered on, conveys the control signal to the oil pump to close the oil pump, and the rod cavity of the oil cylinder is depressurized.
By adopting the technical scheme, the operation data of the roller press are collected in real time through the collecting step, whether the roll gap inclination degree between the two extrusion rolls exceeds a set threshold value is judged through the judging step, the hydraulic control system of the roller press is controlled through the control unit according to the result of the judging step, the pressure P1 of a hydraulic control oil way on the transmission side is increased in a way of filling oil into a rod cavity of a cylinder on the transmission side, the roll gap width b1 on the transmission side is increased, and finally, the roller press is ensured to work under the state of constant pressure and constant roll gap all the time, so that the roller press can be stably produced, the bearing and the hydraulic control oil way are protected, and the service life of the roller press can be effectively prolonged.
Further, in the collecting step, the collecting unit comprises a pressure sensor, the pressure sensor collects the pressure P1 of the hydraulic control oil way on the transmission side of the squeeze roller and the pressure P2 of the hydraulic control oil way on the non-transmission side, and the pressure P1 and the pressure P2 collected by the pressure sensor are sent to the data processing unit for processing; in the judging step, a pressure threshold value deltap is set, the data processing unit calculates a difference value between the pressure P2 and the pressure P1, judges whether the difference value is larger than or equal to the pressure threshold value deltap, and sends the judging result to the control unit.
Further, in the collecting step, the collecting unit comprises a displacement sensor, the displacement sensor collects the roll gap width b1 of the transmission side of the squeeze roll and the roll gap width b2 of the non-transmission side, and the roll gap width b1 and the roll gap width b2 collected by the displacement sensor are sent to the data processing unit for processing; in the judging step, a roll gap threshold value delta b is set, the data processing unit calculates a difference value between the roll gap width b2 and the roll gap width b1, judges whether the difference value is larger than or equal to the roll gap threshold value delta b, and sends a judging result to the control unit.
Further, a pressure relief oil way is arranged on the regulating oil way, one end of the pressure relief oil way is connected with a rod cavity of the oil cylinder through a second electromagnetic reversing valve, and the other end of the pressure relief oil way is connected with the oil tank; in the control step, when the second electromagnetic directional valve is not electrified, the pressure relief oil circuit is communicated with a rod cavity of the oil cylinder through the second electromagnetic directional valve, and oil in the rod cavity enters the pressure relief oil circuit along the second electromagnetic directional valve to finish pressure relief of the rod cavity.
In summary, due to the adoption of the technical scheme, the beneficial effects of the invention are as follows:
1. the invention can monitor the working state of the roller press in real time, and automatically adjusts when the roll gap between the two extrusion rollers is inclined.
2. The invention ensures that the roller press always works under the conditions of constant pressure and constant roller gap, ensures that the roller press can be stably produced, protects the bearing and the hydraulic control oil way, and can effectively prolong the service life of the roller press.
3. According to the invention, the roll gap is regulated in a mode of filling oil into the rod cavity of the transmission side oil cylinder, and the oil with the rod cavity can automatically flow back to the oil tank after the regulation is completed, so that the pressure relief is completed.
4. The invention is provided with an overflow oil return path for protecting the oil cylinder, if the pressure of the oil cylinder is overlarge, the overflow valve is automatically opened, oil with a rod cavity flows back to the oil tank through the overflow valve, and the pressure of the oil cylinder is removed.
5. The data acquisition unit can adopt a pressure sensor to adjust the roll gap in a constant pressure adjusting mode (the transmission side pressure P1 of the squeeze roll is equal to the non-transmission side pressure P2).
6. The data acquisition unit can adopt a displacement sensor to adjust the roll gap in a constant roll gap adjusting mode (the roll gap width b1 of the transmission side of the extrusion roll is equal to the roll gap width b2 of the non-transmission side).
Drawings
FIG. 1 is a schematic view of the roll gap tilt construction of the present invention;
FIG. 2 is a schematic diagram of the hydraulic control system of the present invention;
fig. 3 is a schematic view of the structure of the squeeze roll of the present invention for adjustment.
The marks in the figure: 1-energy accumulator, 2-first throttle valve, 3-first electromagnetic directional valve, 4-pressure sensor, 5-hydro-cylinder, 6-second electromagnetic directional valve, 7-one-way throttle valve, 8-overflow valve, 9-second throttle valve, 10-third electromagnetic directional valve, 11-oil pump.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
1-3, A hydraulic control system for adjusting a roller press comprises an energy accumulator 1, an oil cylinder 5, an oil pump 11 and a squeeze roller, wherein a rod cavity of the oil pump 11 is connected with the oil cylinder 5 to form a control oil path, a rodless cavity of the oil cylinder 5 is connected to form an adjusting oil path, a first electromagnetic directional valve 3 is arranged on the control oil path, a second throttle valve 9 is arranged between the oil pump 11 and the first electromagnetic directional valve 3, and the second throttle valve 9 can control the flow passing through the first electromagnetic directional valve 3 to avoid shaking of the oil cylinder 5 caused by overlarge flow; an energy accumulator 1 is arranged between the first electromagnetic directional valve 3 and the rodless cavity of the oil cylinder 5, a first throttle valve 2 is arranged between the energy accumulator 1 and the oil cylinder 5, and the flow between the energy accumulator 1 and the oil cylinder 5 can be controlled by the first throttle valve 2, so that the shaking of the oil cylinder 5 caused by overlarge flow is avoided; a control oil discharging branch is further arranged between the first electromagnetic directional valve 3 and the oil cylinder 5, a third electromagnetic directional valve 10 is arranged on the control oil discharging branch, and when the third electromagnetic directional valve 10 is powered, oil in a rodless cavity of the oil cylinder 5 flows out along the control oil discharging branch; the regulating oil way is provided with a second electromagnetic reversing valve 6, a piston of the oil cylinder 5 is connected with the squeeze roller and drives the squeeze roller to move, and the regulating oil way and the control oil way are matched to form a hydraulic control oil way; the hydraulic control oil way of the squeeze roll transmission side oil cylinder 5 is a transmission side hydraulic control oil way, the hydraulic control oil way of the squeeze roll non-transmission side oil cylinder 5 is a non-transmission side hydraulic control oil way, and the squeeze roll non-transmission side oil cylinder further comprises a data acquisition unit, a data processing unit and a control unit, wherein the data acquisition unit is in signal connection with the data processing unit, the data processing unit is in signal connection with the control unit, and the second electromagnetic directional valve 6 is in signal connection and is controlled by the control unit; the data acquisition unit acquires operation data of the transmission side and the non-transmission side of the squeeze roller, the data processing unit judges whether the squeeze roller needs to be regulated according to the data acquired by the data acquisition unit, and the control unit controls the second electromagnetic directional valve 6 and the oil pump 11 of the hydraulic control oil circuit of the transmission side according to the judging result of the data processing unit; when the second electromagnetic directional valve 6 of the transmission side hydraulic control oil way is powered on, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6 and conveys oil to the rod cavity, and the pressure and the roll gap width of the transmission side of the squeeze roll are adjusted. Specifically, the working state of the roller press is monitored in real time through the data acquisition unit, once the inclination of the roller gap between the two extrusion rollers is monitored, the control unit sends control signals to the second electromagnetic directional valve 6 and the oil pump 11 of the hydraulic control oil circuit on the transmission side, the second electromagnetic directional valve 6 is electrified, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5, the oil pump 11 works to convey oil to the rod cavity, the pressure P1 of the hydraulic control oil circuit on the transmission side rises, the roller gap width b1 on the transmission side becomes larger, and finally, the pressure on the transmission side and the non-transmission side can be basically equal when the roller gap widths on the transmission side and the non-transmission side of the roller press are basically equal, so that the roller press can be stably produced, the bearing and the hydraulic control oil circuit are protected, and the service life of the roller press can be effectively prolonged.
The regulating oil way is provided with a pressure relief oil way, one end of the pressure relief oil way is connected with a rod cavity of the oil cylinder 5 through a second electromagnetic directional valve 6, the other end of the pressure relief oil way is connected with an oil tank, and when the second electromagnetic directional valve 6 is not powered, the oil in the rod cavity flows back to the oil tank along the pressure relief oil way through the second electromagnetic directional valve 6. Specifically, after the oil in the rod cavity finishes the adjustment of the roll gap, the second electromagnetic directional valve 6 is not electrified under the control of the control unit, the pressure relief oil way is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6, the oil in the rod cavity flows back to the oil tank from the oil relief oil way, the pressure relief of the rod cavity is finished, and the roll squeezer returns to the normal working state.
The one-way throttle valve 7 is arranged between the second electromagnetic directional valve 6 and the oil cylinder 5, the one-way throttle valve 7 can control the flow entering the rod cavity of the oil cylinder 5, shaking of the oil cylinder 5 caused by overlarge flow is prevented, meanwhile, oil in the rod cavity can flow back to the oil tank through the one-way throttle valve 7 in an unobstructed manner, and rapid pressure relief of the rod cavity of the oil cylinder 5 is realized.
An overflow oil return path is arranged between the second electromagnetic directional valve 6 and a rod cavity of the oil cylinder 5, the overflow oil return path is connected with an oil tank through an overflow valve 8, after the pressure of the rod cavity reaches a threshold value, the overflow valve 8 is opened, and oil in the rod cavity flows back to the oil tank through the overflow valve 8. Specifically, an overflow oil return path is arranged to protect the oil cylinder 5, if the pressure of the oil cylinder 5 is too high, the overflow valve 8 is automatically opened, oil with a rod cavity flows back to the oil tank through the overflow valve 8, and the pressure of the oil cylinder 5 is relieved.
Example 2
1-3, A hydraulic control system for adjusting a roller press comprises an energy accumulator 1, an oil cylinder 5, an oil pump 11 and a squeeze roller, wherein a rod cavity of the oil pump 11 is connected with the oil cylinder 5 to form a control oil path, a rodless cavity of the oil cylinder 5 is connected to form an adjusting oil path, a first electromagnetic directional valve 3 is arranged on the control oil path, the energy accumulator 1 is arranged between the first electromagnetic directional valve 3 and the rodless cavity of the oil cylinder 5, a second electromagnetic directional valve 6 is arranged on the adjusting oil path, a piston of the oil cylinder 5 is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil path and the control oil path are matched to form a hydraulic control oil path; the hydraulic control oil way of the squeeze roll transmission side oil cylinder 5 is a transmission side hydraulic control oil way, the hydraulic control oil way of the squeeze roll non-transmission side oil cylinder 5 is a non-transmission side hydraulic control oil way, and the squeeze roll non-transmission side oil cylinder further comprises a data acquisition unit, a data processing unit and a control unit, wherein the data acquisition unit is in signal connection with the data processing unit, the data processing unit is in signal connection with the control unit, and the second electromagnetic directional valve 6 is in signal connection and is controlled by the control unit; the data acquisition unit acquires operation data of the transmission side and the non-transmission side of the squeeze roller, the data processing unit judges whether the squeeze roller needs to be regulated according to the data acquired by the data acquisition unit, and the control unit controls the second electromagnetic directional valve 6 and the oil pump 11 of the hydraulic control oil circuit of the transmission side according to the judging result of the data processing unit; when the second electromagnetic directional valve 6 of the transmission side hydraulic control oil way is powered on, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6 and conveys oil to the rod cavity, and the pressure and the roll gap width of the transmission side of the squeeze roll are adjusted.
The data acquisition unit comprises a pressure sensor 4, and the pressure sensor 4 at least acquires the pressure P1 of the rodless cavity of the extrusion roller transmission side oil cylinder 5 and the pressure P2 of the rodless cavity of the non-transmission side oil cylinder 5. Specifically, the pressure sensor 4 is used for collecting the pressure P1 of the rodless cavity of the extrusion roller transmission side oil cylinder 5 and the pressure P2 of the rodless cavity of the non-transmission side oil cylinder 5, when the difference value between the pressure P2 and the pressure P1 is larger than or equal to a set pressure threshold value delta P, the control unit sends a control signal to the second electromagnetic directional valve 6 of the transmission side hydraulic control oil circuit and the oil pump 11, the oil pump 11 works and conveys oil to the rod cavity through the second electromagnetic directional valve 6, the pressure P1 of the transmission side hydraulic control oil circuit is increased, the width b1 of the roller gap on the transmission side is increased, and when the pressure P2 is equal to the pressure P1, the adjustment is completed, namely, the hydraulic control system adjusts the roller gap in a constant pressure mode.
The pressure sensor 4 is arranged between the accumulator 1 and the rodless cavity of the oil cylinder 5, and collects the pressure of the rodless cavity of the oil cylinder 5; the pressure sensor 4 is in signal connection with the data processing unit, and pressure data of the rodless cavity of the oil cylinder 5 is transferred between the pressure sensor 4 and the data processing unit. Specifically, after the pressure sensor 4 collects the pressure P1 and the pressure P2, the data is sent to the data processing unit, the data processing unit calculates the difference between the pressure P2 and the pressure P1, judges whether the difference is greater than or equal to a set threshold value, and sends the judging result to the control unit, and the control unit regulates and controls the roll squeezer according to the judging result, so that the roll squeezer always keeps working under the state of constant pressure and constant roll gap.
Example 3
1-3, A hydraulic control system for adjusting a roller press comprises an energy accumulator 1, an oil cylinder 5, an oil pump 11 and a squeeze roller, wherein a rod cavity of the oil pump 11 is connected with the oil cylinder 5 to form a control oil path, a rodless cavity of the oil cylinder 5 is connected to form an adjusting oil path, a first electromagnetic directional valve 3 is arranged on the control oil path, the energy accumulator 1 is arranged between the first electromagnetic directional valve 3 and the rodless cavity of the oil cylinder 5, a second electromagnetic directional valve 6 is arranged on the adjusting oil path, a piston of the oil cylinder 5 is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil path and the control oil path are matched to form a hydraulic control oil path; the hydraulic control oil way of the squeeze roll transmission side oil cylinder 5 is a transmission side hydraulic control oil way, the hydraulic control oil way of the squeeze roll non-transmission side oil cylinder 5 is a non-transmission side hydraulic control oil way, and the squeeze roll non-transmission side oil cylinder further comprises a data acquisition unit, a data processing unit and a control unit, wherein the data acquisition unit is in signal connection with the data processing unit, the data processing unit is in signal connection with the control unit, and the second electromagnetic directional valve 6 is in signal connection and is controlled by the control unit; the data acquisition unit acquires operation data of the transmission side and the non-transmission side of the squeeze roller, the data processing unit judges whether the squeeze roller needs to be regulated according to the data acquired by the data acquisition unit, and the control unit controls the second electromagnetic directional valve 6 and the oil pump 11 of the hydraulic control oil circuit of the transmission side according to the judging result of the data processing unit; when the second electromagnetic directional valve 6 of the transmission side hydraulic control oil way is powered on, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6 and conveys oil to the rod cavity, and the pressure and the roll gap width of the transmission side of the squeeze roll are adjusted.
The data acquisition unit comprises a displacement sensor, wherein the displacement sensor acquires the roll gap width b1 of the transmission side of the extrusion roll and the roll gap width b2 of the non-transmission side; the displacement sensor is in signal connection with the data processing unit, and data of the roll gap width are transmitted between the displacement sensor and the data processing unit. Specifically, the roll gap width b1 of the squeeze roll on the transmission side and the roll gap width b2 of the non-transmission side are collected through a displacement sensor and sent to a data processing unit, the data processing unit calculates the difference value between the roll gap width b2 and the roll gap width b1, judges whether the difference value is larger than or equal to a set threshold value, and sends a judging result to a control unit, when the difference value is larger than or equal to the set roll gap threshold value delta b, the control unit sends a control signal to a second electromagnetic reversing valve 6 and an oil pump 11 of a transmission side hydraulic control oil circuit, the oil pump 11 works, oil is conveyed to a rod cavity through the second electromagnetic reversing valve 6, the pressure P1 of the transmission side hydraulic control oil circuit is increased, the roll gap width b1 on the transmission side is enlarged, and when the roll gap width b2 is equal to the roll gap width b1, adjustment is completed, namely, a hydraulic control system adjusts the roll gap in a constant roll gap mode, and the roll press is ensured to always keep working under a constant pressure and a constant roll gap state.
Example 4
1-3, The hydraulic control method is applied to a hydraulic control system of a roller press, the hydraulic control system of the roller press comprises an energy accumulator 1, an oil cylinder 5, an oil pump 11 and a squeeze roller, the oil pump 11 is connected with a rod cavity of the oil cylinder 5 to form a control oil path, a rodless cavity of the oil cylinder 5 is connected with an adjusting oil path, a first electromagnetic directional valve 3 is arranged on the control oil path, the energy accumulator 1 is arranged between the first electromagnetic directional valve 3 and the rodless cavity of the oil cylinder 5, a second electromagnetic directional valve 6 is arranged on the adjusting oil path, a piston of the oil cylinder 5 is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil path and the control oil path are matched to form a hydraulic control oil path; the hydraulic control oil way for controlling the squeeze roller transmission side oil cylinder 5 is a transmission side hydraulic control oil way, and the hydraulic control oil way for controlling the squeeze roller non-transmission side oil cylinder 5 is a non-transmission side hydraulic control oil way; the method is characterized by comprising the following steps of:
The acquisition step: the operation data of the transmission side and the non-transmission side of the squeeze roller are collected through the collecting unit, and the collected data are sent to the data processing unit for processing;
judging: setting a threshold value, calculating a difference value of operation data of a non-transmission side and a transmission side by a data processing unit, judging whether the difference value is larger than or equal to the threshold value, and sending a judging result to a control unit by the data processing unit;
The control step: when the difference value received by the control unit is smaller than the threshold value, the second electromagnetic directional valve 6 of the transmission side hydraulic control oil way is not electrified, the rod cavity of the oil cylinder 5 is oilless and pressureless, when the difference value received by the control unit is larger than or equal to the threshold value, the control unit controls the second electromagnetic directional valve 6 of the transmission side hydraulic control oil way to be electrified, the oil pump 11 is started, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6 and conveys oil to the rod cavity, and when the difference value of the non-transmission side operation data received by the control unit and the transmission side operation data is 0, the control unit transmits a control signal to the second electromagnetic directional valve 6 of the transmission side hydraulic control oil way to enable the second electromagnetic directional valve 6 to be not electrified, transmits the control signal to the oil pump 11 to close the oil pump 11, and the rod cavity of the oil cylinder 5 is depressurized.
Specifically, the operation data of the roller press are collected in real time through the collecting step, whether the roll gap inclination degree between the two extrusion rolls exceeds a set threshold value is judged through the judging step, the hydraulic control system of the roller press is controlled through the control unit according to the result of the judging step, the pressure P1 of a hydraulic control oil way on the transmission side is increased in a mode that a rod cavity is filled with oil to the oil cylinder 5 on the transmission side, the roll gap width b1 on the transmission side is increased, the roller press is finally ensured to work under the state that the roller press is always kept at constant pressure and constant roll gap, the roller press can be stably produced, the bearing and the hydraulic control oil way are protected, and the service life of the roller press can be effectively prolonged.
A pressure relief oil way is arranged on the regulating oil way, one end of the pressure relief oil way is connected with a rod cavity of the oil cylinder 5 through a second electromagnetic reversing valve 6, and the other end of the pressure relief oil way is connected with an oil tank; in the control step, when the second electromagnetic directional valve 6 is not electrified, the pressure relief oil path is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6, and oil in the rod cavity enters the pressure relief oil path along the second electromagnetic directional valve 6 to finish pressure relief of the rod cavity.
Example 5
1-3, The hydraulic control method is applied to a hydraulic control system of a roller press, the hydraulic control system of the roller press comprises an energy accumulator 1, an oil cylinder 5, an oil pump 11 and a squeeze roller, the oil pump 11 is connected with a rod cavity of the oil cylinder 5 to form a control oil path, a rodless cavity of the oil cylinder 5 is connected with an adjusting oil path, a first electromagnetic directional valve 3 is arranged on the control oil path, the energy accumulator 1 is arranged between the first electromagnetic directional valve 3 and the rodless cavity of the oil cylinder 5, a second electromagnetic directional valve 6 is arranged on the adjusting oil path, a piston of the oil cylinder 5 is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil path and the control oil path are matched to form a hydraulic control oil path; the hydraulic control oil way for controlling the squeeze roller transmission side oil cylinder 5 is a transmission side hydraulic control oil way, and the hydraulic control oil way for controlling the squeeze roller non-transmission side oil cylinder 5 is a non-transmission side hydraulic control oil way; the method is characterized by comprising the following steps of:
The acquisition step: the operation data of the transmission side and the non-transmission side of the squeeze roller are collected through the collecting unit, and the collected data are sent to the data processing unit for processing;
judging: setting a threshold value, calculating a difference value of operation data of a non-transmission side and a transmission side by a data processing unit, judging whether the difference value is larger than or equal to the threshold value, and sending a judging result to a control unit by the data processing unit;
The control step: when the difference value received by the control unit is smaller than the threshold value, the second electromagnetic directional valve 6 of the transmission side hydraulic control oil way is not electrified, the rod cavity of the oil cylinder 5 is oilless and pressureless, when the difference value received by the control unit is larger than or equal to the threshold value, the control unit controls the second electromagnetic directional valve 6 of the transmission side hydraulic control oil way to be electrified, the oil pump 11 is started, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6 and conveys oil to the rod cavity, and when the difference value of the non-transmission side operation data received by the control unit and the transmission side operation data is 0, the control unit transmits a control signal to the second electromagnetic directional valve 6 of the transmission side hydraulic control oil way to enable the second electromagnetic directional valve 6 to be not electrified, transmits the control signal to the oil pump 11 to close the oil pump 11, and the rod cavity of the oil cylinder 5 is depressurized.
In the collecting step, the collecting unit comprises a pressure sensor 4, the pressure sensor 4 collects the pressure P1 of the hydraulic control oil way at the transmission side of the squeeze roller and the pressure P2 of the hydraulic control oil way at the non-transmission side, and the pressure P1 and the pressure P2 collected by the pressure sensor 4 are sent to the data processing unit for processing; in the judging step, a pressure threshold value deltap is set, the data processing unit calculates a difference value between the pressure P2 and the pressure P1, judges whether the difference value is larger than or equal to the pressure threshold value deltap, and sends the judging result to the control unit. Specifically, when the difference between the pressure P2 and the pressure P1 is smaller than the pressure threshold Δp, the second electromagnetic directional valve 6 of the transmission side hydraulic control oil path is not powered, the rod cavity of the oil cylinder 5 is oil-free and non-pressurized, when the difference between the pressure P1 and the pressure P2 is greater than or equal to the pressure threshold Δp, the second electromagnetic directional valve 6 of the transmission side hydraulic control oil path is powered, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6 and delivers oil to the rod cavity, at this time, the pressure P1 is raised, the roll gap width b1 on the transmission side is increased, until the judgment result received by the control unit is that the pressure P1 is equal to the pressure P2, the second electromagnetic directional valve 6 of the transmission side hydraulic control oil path is not powered, and the rod cavity of the oil cylinder 5 is depressurized.
Example 6
1-3, The hydraulic control method is applied to a hydraulic control system of a roller press, the hydraulic control system of the roller press comprises an energy accumulator 1, an oil cylinder 5, an oil pump 11 and a squeeze roller, the oil pump 11 is connected with a rod cavity of the oil cylinder 5 to form a control oil path, a rodless cavity of the oil cylinder 5 is connected with an adjusting oil path, a first electromagnetic directional valve 3 is arranged on the control oil path, the energy accumulator 1 is arranged between the first electromagnetic directional valve 3 and the rodless cavity of the oil cylinder 5, a second electromagnetic directional valve 6 is arranged on the adjusting oil path, a piston of the oil cylinder 5 is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil path and the control oil path are matched to form a hydraulic control oil path; the hydraulic control oil way for controlling the squeeze roller transmission side oil cylinder 5 is a transmission side hydraulic control oil way, and the hydraulic control oil way for controlling the squeeze roller non-transmission side oil cylinder 5 is a non-transmission side hydraulic control oil way; the method is characterized by comprising the following steps of:
The acquisition step: the operation data of the transmission side and the non-transmission side of the squeeze roller are collected through the collecting unit, and the collected data are sent to the data processing unit for processing;
judging: setting a threshold value, calculating a difference value of operation data of a non-transmission side and a transmission side by a data processing unit, judging whether the difference value is larger than or equal to the threshold value, and sending a judging result to a control unit by the data processing unit;
The control step: when the difference value received by the control unit is smaller than the threshold value, the second electromagnetic directional valve 6 of the transmission side hydraulic control oil way is not electrified, the rod cavity of the oil cylinder 5 is oilless and pressureless, when the difference value received by the control unit is larger than or equal to the threshold value, the control unit controls the second electromagnetic directional valve 6 of the transmission side hydraulic control oil way to be electrified, the oil pump 11 is started, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6 and conveys oil to the rod cavity, and when the difference value of the non-transmission side operation data received by the control unit and the transmission side operation data is 0, the control unit transmits a control signal to the second electromagnetic directional valve 6 of the transmission side hydraulic control oil way to enable the second electromagnetic directional valve 6 to be not electrified, transmits the control signal to the oil pump 11 to close the oil pump 11, and the rod cavity of the oil cylinder 5 is depressurized.
In the collecting step, a displacement sensor is included in the collecting unit, the displacement sensor collects the roll gap width b1 of the transmission side of the squeeze roll and the roll gap width b2 of the non-transmission side, and the roll gap width b1 and the roll gap width b2 collected by the displacement sensor are sent to a data processing unit for processing; in the judging step, a roll gap threshold value delta b is set, the data processing unit calculates a difference value between the roll gap width b2 and the roll gap width b1, judges whether the difference value is larger than or equal to the roll gap threshold value delta b, and sends a judging result to the control unit. When the judging result received by the control unit is that the difference between the roll gap width b2 and the roll gap width b1 is smaller than the roll gap threshold value delta b, the second electromagnetic directional valve 6 of the transmission side hydraulic control oil circuit is not powered, the rod cavity of the oil cylinder 5 is oilless and pressureless, when the judging result received by the control unit is that the difference between the roll gap width b1 and the roll gap width b2 is larger than or equal to the roll gap threshold value delta b, the second electromagnetic directional valve 6 of the transmission side hydraulic control oil circuit is powered, the oil pump 11 is communicated with the rod cavity of the oil cylinder 5 through the second electromagnetic directional valve 6 and delivers oil to the rod cavity, at the moment, the roll gap width b1 is increased, the pressure P1 of the transmission side hydraulic control oil circuit is increased until the judging result received by the control unit is that the roll gap width b1 is equal to the roll gap width b2, the second electromagnetic directional valve 6 of the transmission side hydraulic control oil circuit is not powered, and the rod cavity of the oil cylinder 5 is depressurized.
The principles and embodiments of the present invention have been described herein with reference to specific examples, which are intended to be merely illustrative of the methods of the present invention and their core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Claims (5)
1. The hydraulic control system for adjusting the roller press comprises an energy accumulator (1), an oil cylinder (5), an oil pump (11) and a squeeze roller, wherein a rod cavity of the oil pump (11) is connected with the oil cylinder (5) to form a control oil path, a rodless cavity of the oil cylinder (5) is connected to form an adjusting oil path, a first electromagnetic directional valve (3) is arranged on the control oil path, the energy accumulator (1) is arranged between the first electromagnetic directional valve (3) and the rodless cavity of the oil cylinder (5), a second electromagnetic directional valve (6) is arranged on the adjusting oil path, a piston of the oil cylinder (5) is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil path and the control oil path are matched to form a hydraulic control oil path; the hydraulic control oil way for controlling the squeeze roller transmission side oil cylinder (5) is a transmission side hydraulic control oil way, and the hydraulic control oil way for controlling the squeeze roller non-transmission side oil cylinder (5) is a non-transmission side hydraulic control oil way, and is characterized in that: the system also comprises a data acquisition unit, a data processing unit and a control unit, wherein the data acquisition unit is in signal connection with the data processing unit, the data processing unit is in signal connection with the control unit, and the second electromagnetic directional valve (6) is in signal connection and is controlled by the control unit; the data acquisition unit acquires operation data of a transmission side and a non-transmission side of the squeeze roller, the data processing unit judges whether the squeeze roller needs to be regulated according to the data acquired by the data acquisition unit, and the control unit controls a second electromagnetic reversing valve (6) and an oil pump (11) of a hydraulic control oil circuit of the transmission side according to a judging result of the data processing unit; when a second electromagnetic directional valve (6) of the transmission side hydraulic control oil way is powered on, an oil pump (11) is communicated with a rod cavity of the oil cylinder (5) through the second electromagnetic directional valve (6) and conveys oil to the rod cavity, and the pressure and the roll gap width of the transmission side of the squeeze roll are adjusted; the regulating oil way is provided with a pressure relief oil way, one end of the pressure relief oil way is connected with a rod cavity of the oil cylinder (5) through a second electromagnetic directional valve (6), the other end of the pressure relief oil way is connected with the oil tank, and when the second electromagnetic directional valve (6) is not powered, the oil in the rod cavity flows back to the oil tank along the pressure relief oil way through the second electromagnetic directional valve (6); a one-way throttle valve (7) is arranged between the second electromagnetic directional valve (6) and the oil cylinder (5), the one-way throttle valve (7) can control the flow entering a rod cavity of the oil cylinder (5), and meanwhile, the oil with the rod cavity can flow back to the oil tank through the one-way throttle valve (7) without obstruction; an overflow oil return channel is arranged between the second electromagnetic directional valve (6) and a rod cavity of the oil cylinder (5), the overflow oil return channel is connected with an oil tank through an overflow valve (8), after the pressure of the rod cavity reaches a threshold value, the overflow valve (8) is opened, and oil in the rod cavity flows back to the oil tank through the overflow valve (8); the data acquisition unit comprises a pressure sensor (4), wherein the pressure sensor (4) is used for acquiring at least the pressure P1 of a rodless cavity of a squeeze roller transmission side oil cylinder (5) and the pressure P2 of a rodless cavity of a non-transmission side oil cylinder (5); the pressure sensor (4) is arranged between the energy accumulator (1) and the rodless cavity of the oil cylinder (5) and is used for collecting the pressure of the rodless cavity of the oil cylinder (5); the pressure sensor (4) is in signal connection with the data processing unit, and pressure data of the rodless cavity of the oil cylinder (5) is transmitted between the pressure sensor (4) and the data processing unit; the data acquisition unit comprises a displacement sensor, wherein the displacement sensor at least acquires the roll gap width b1 of the transmission side of the extrusion roll and the roll gap width b2 of the non-transmission side; the displacement sensor is in signal connection with the data processing unit, and data of the roll gap width are transmitted between the displacement sensor and the data processing unit.
2. The hydraulic control method is applied to the hydraulic control system for adjusting the roller press according to claim 1, the hydraulic control system for the roller press comprises an energy accumulator (1), an oil cylinder (5), an oil pump (11) and a squeeze roller, the oil pump (11) is connected with a rod cavity of the oil cylinder (5) to form a control oil path, a rodless cavity of the oil cylinder (5) is connected with the control oil path to form an adjusting oil path, a first electromagnetic directional valve (3) is arranged on the control oil path, the energy accumulator (1) is arranged between the first electromagnetic directional valve (3) and the rodless cavity of the oil cylinder (5), a second electromagnetic directional valve (6) is arranged on the adjusting oil path, a piston of the oil cylinder (5) is connected with the squeeze roller and drives the squeeze roller to move, and the adjusting oil path and the control oil path are matched with the control oil path to form a hydraulic control oil path; the hydraulic control oil way for controlling the squeeze roller transmission side oil cylinder (5) is a transmission side hydraulic control oil way, and the hydraulic control oil way for controlling the squeeze roller non-transmission side oil cylinder (5) is a non-transmission side hydraulic control oil way; the method is characterized by comprising the following steps of:
The acquisition step: the operation data of the transmission side and the non-transmission side of the squeeze roller are collected through the collecting unit, and the collected data are sent to the data processing unit for processing;
judging: setting a threshold value, calculating a difference value of operation data of a non-transmission side and a transmission side by a data processing unit, judging whether the difference value is larger than or equal to the threshold value, and sending a judging result to a control unit by the data processing unit;
The control step: when the difference value is smaller than the threshold value, the second electromagnetic directional valve (6) of the transmission side hydraulic control oil way is not electrified, the rod cavity of the oil cylinder (5) is free of oil and pressure, when the difference value is larger than or equal to the threshold value, the second electromagnetic directional valve (6) of the transmission side hydraulic control oil way is controlled by the control unit to be electrified, the oil pump (11) is started, the oil pump (11) is communicated with the rod cavity of the oil cylinder (5) through the second electromagnetic directional valve (6), oil is conveyed to the rod cavity, and when the difference value between the non-transmission side and the transmission side operation data received by the control unit is 0, the control unit transmits a control signal to the second electromagnetic directional valve (6) of the transmission side hydraulic control oil way to enable the control signal to be not electrified, and transmits the control signal to the oil pump (11) to close the oil pump (11), and the rod cavity of the oil cylinder (5) is depressurized.
3. The hydraulic control method according to claim 2, characterized in that: in the collecting step, the collecting unit comprises a pressure sensor (4), wherein the pressure sensor (4) collects the pressure P1 of a hydraulic control oil way at the transmission side of the squeeze roller and the pressure P2 of a hydraulic control oil way at the non-transmission side, and the pressure P1 and the pressure P2 collected by the pressure sensor (4) are sent to a data processing unit for processing; in the judging step, a pressure threshold value deltap is set, the data processing unit calculates a difference value between the pressure P2 and the pressure P1, judges whether the difference value is larger than or equal to the pressure threshold value deltap, and sends the judging result to the control unit.
4. The hydraulic control method according to claim 2, characterized in that: in the collecting step, a displacement sensor is included in the collecting unit, the displacement sensor collects the roll gap width b1 of the transmission side of the squeeze roll and the roll gap width b2 of the non-transmission side, and the roll gap width b1 and the roll gap width b2 collected by the displacement sensor are sent to a data processing unit for processing; in the judging step, a roll gap threshold value delta b is set, the data processing unit calculates a difference value between the roll gap width b2 and the roll gap width b1, judges whether the difference value is larger than or equal to the roll gap threshold value delta b, and sends a judging result to the control unit.
5. The hydraulic control method according to claim 2, 3, or 4, characterized in that: a pressure relief oil way is arranged on the regulating oil way, one end of the pressure relief oil way is connected with a rod cavity of the oil cylinder (5) through a second electromagnetic reversing valve (6), and the other end of the pressure relief oil way is connected with an oil tank; in the control step, when the second electromagnetic directional valve (6) is not electrified, the pressure relief oil circuit is communicated with a rod cavity of the oil cylinder (5) through the second electromagnetic directional valve (6), and oil in the rod cavity enters the pressure relief oil circuit along the second electromagnetic directional valve (6) to finish pressure relief of the rod cavity.
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