CN111379752A - Hydraulic clamp compression control system - Google Patents
Hydraulic clamp compression control system Download PDFInfo
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- CN111379752A CN111379752A CN202010300134.0A CN202010300134A CN111379752A CN 111379752 A CN111379752 A CN 111379752A CN 202010300134 A CN202010300134 A CN 202010300134A CN 111379752 A CN111379752 A CN 111379752A
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- 230000006835 compression Effects 0.000 title claims description 20
- 238000007906 compression Methods 0.000 title claims description 20
- 239000003921 oil Substances 0.000 claims abstract description 190
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 36
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000003754 machining Methods 0.000 description 10
- 230000006837 decompression Effects 0.000 description 8
- 238000000034 method Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 230000005489 elastic deformation Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000002452 interceptive effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000010729 system oil Substances 0.000 description 1
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q7/00—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting
- B23Q7/04—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting by means of grippers
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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
- F15B1/021—Installations or systems with accumulators used for damping
-
- 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
- F15B1/024—Installations or systems with accumulators used as a supplementary power source, e.g. to store energy in idle periods to balance pump load
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention relates to the technical field of hydraulic control, and particularly discloses a hydraulic clamp pressing control system, which comprises: the high-pressure valve bank and the low-pressure valve bank are both arranged on the oil circuit board, and one end of the oil circuit board is connected with an oil supply port and an oil return port of the hydraulic station; the output end of the high-pressure valve group and the output end of the low-pressure valve group are both used for connecting an execution assembly, the high-pressure valve group can introduce high-pressure hydraulic oil obtained by pressurizing hydraulic oil into the execution assembly, and the low-pressure valve group can introduce low-pressure hydraulic oil obtained by decompressing hydraulic oil into the execution assembly; the high-pressure valve bank can output high-pressure oil to the execution assembly, the low-pressure valve bank can output low-pressure oil to the execution assembly, and the high-pressure valve bank and the low-pressure valve bank are matched to further realize a pressure maintaining function and a pressure releasing function. The hydraulic clamp pressing control system provided by the invention can realize high-pressure, low-pressure, pressure maintaining and pressure relief control on the clamp, and can automatically switch and detect the pressure.
Description
Technical Field
The invention relates to the technical field of hydraulic control, in particular to a hydraulic clamp pressing control system.
Background
With the continuous upgrading of the automobile industry, the requirements on the machining precision and the machining beat of automobile parts are higher. With the continuous application of the automatic feeding and discharging mode in the processing, more requirements are also put forward on the processing clamp and the machine tool. For some parts with thin wall thickness, poor rigidity and high machining precision requirement, higher requirements are provided for the clamping control of the clamp during machining. When workpieces are fed and discharged and processed, the control of the pressure of the clamping loop is complex. The conventional circuit adopting the two-stage pressure reducing valve cannot meet the practical use requirement. There is a need for a hydraulic control system that can perform automatic pressure switching and sensing.
Disclosure of Invention
The invention provides a hydraulic clamp pressing control system, which solves the problem of lack of a hydraulic control system for automatically switching and detecting pressure in the related art.
As an aspect of the present invention, there is provided a hydraulic clamp compression control system, including: the hydraulic system comprises an oil circuit board, a high-pressure valve bank and a low-pressure valve bank, wherein the high-pressure valve bank and the low-pressure valve bank are both arranged on the oil circuit board, one end of the oil circuit board is connected with an oil supply port and an oil return port of a hydraulic station, hydraulic oil entering from the oil supply port can respectively enter the high-pressure valve bank and the low-pressure valve bank through an internal channel of the oil circuit board, and the output end of the high-pressure valve bank is communicated with the output end of the low-;
the output end of the high-pressure valve group and the output end of the low-pressure valve group are both used for being connected with an execution assembly, the high-pressure valve group can introduce high-pressure hydraulic oil obtained by pressurizing the hydraulic oil into the execution assembly, the low-pressure valve group can introduce low-pressure hydraulic oil obtained by depressurizing the hydraulic oil into the execution assembly, and the high-pressure hydraulic oil or the low-pressure hydraulic oil in the execution assembly can return to a hydraulic station through the internal channel of the oil circuit board and the oil return port;
the high-pressure valve bank can be right through the electrical control system the executive component outputs high-pressure oil, the low-pressure valve bank can be right through the electrical control system the executive component outputs low-pressure oil, and the high-pressure valve bank and the low-pressure valve bank are matched to further realize a pressure maintaining function and a pressure releasing function.
Further, the high pressure valve block includes: first pressure switch valve, first pilot operated check valve, high pressure relief valve and first switching-over valve, first pressure switch valve with the oil circuit board is connected, first pilot operated check valve with first pressure switch valve is connected, high pressure relief valve with first pilot operated check valve is connected, first switching-over valve with high pressure relief valve is connected, the hydraulic oil that supplies the mouth to get into can be followed first pressure switch valve and first pilot operated check valve get into high pressure relief valve, high pressure relief valve can be right hydraulic oil reduces pressure, then passes through first switching-over valve high pressure relief valve, first pilot operated check valve with first pressure switch valve enters into the executive component.
Further, the first pressure switch valve comprises a first pressure switch and a second pressure switch, and the first pressure switch and the second pressure switch are used for detecting the pressure of an oil path between the high-pressure valve group and the actuating assembly.
Further, the first reversing valve comprises a first electromagnet and a second electromagnet, and the first electromagnet and the second electromagnet are used for controlling reversing of an oil path of the high-pressure valve group.
Further, the low pressure valves include a second reversing valve, a low pressure reducing valve, a second hydraulic control one-way valve and a second pressure switch valve, the second pressure switch valve is connected with the oil circuit board, the second hydraulic control one-way valve is connected with the second pressure switch valve, the low pressure reducing valve is connected with the second hydraulic control one-way valve, the second reversing valve is connected with the low pressure reducing valve, hydraulic oil entering from the oil supply port can be followed by the second pressure switch valve and the second hydraulic control one-way valve to enter the low pressure reducing valve, and then enters the second reversing valve after the pressure reduction of the low pressure reducing valve, and then the low pressure reducing valve, the second hydraulic control one-way valve and the second pressure switch valve enter the execution assembly.
Further, the second pressure switch valve includes a third pressure switch and a fourth pressure switch, and the third pressure switch and the fourth pressure switch are both used for detecting the pressure of the oil path between the low pressure valve group and the actuating assembly.
Further, the second reversing valve comprises a third electromagnet and a fourth electromagnet, and the third electromagnet and the fourth electromagnet are used for controlling reversing of an oil path of the low-pressure valve group.
Further, the first reversing valve, the second reversing valve, the first hydraulic control one-way valve and the second hydraulic control one-way valve act together to realize pressure maintaining or pressure relief in the high-pressure valve bank, the low-pressure valve bank and the oil circuit board.
Furthermore, the hydraulic clamp compression control system further comprises an energy accumulator, and the energy accumulator is respectively connected with the oil way of the high-pressure valve bank and the oil way of the low-pressure valve bank.
Furthermore, the other end of the oil circuit board is provided with a detachable plugging structure.
Compared with the prior art, the hydraulic clamp pressing control system provided by the invention is based on fluid transmission and electrical control. The high-pressure valve bank, the low-pressure valve bank and the matching of the high-pressure valve bank and the low-pressure valve bank can realize high-pressure, low-pressure, pressure maintaining and pressure relief control of the clamp, can perform automatic pressure switching and detection, has the advantages of matching with the feeding and discharging of a mechanical arm, can save the advantages of an anti-falling mechanism or an auxiliary pressing mechanism on the clamp, reduces workpiece deformation, and improves the processing precision and the processing efficiency.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a hydraulic clamp pressing control system provided by the invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this embodiment, a hydraulic clamp pressing control system is provided, and fig. 1 is a schematic structural diagram of a hydraulic clamp pressing control system according to an embodiment of the present invention, as shown in fig. 1, including: the hydraulic system comprises an oil circuit board 9, a high-pressure valve bank and a low-pressure valve bank, wherein the high-pressure valve bank and the low-pressure valve bank are both installed on the oil circuit board 9, one end of the oil circuit board 9 is connected with an oil supply port and an oil return port of a hydraulic station, hydraulic oil entering from the oil supply port can respectively enter the high-pressure valve bank and the low-pressure valve bank through an internal channel of the oil circuit board, and an output end A1 of the high-pressure valve bank is communicated with an output end A2 of the low-;
the output end of the high-pressure valve group and the output end of the low-pressure valve group are both used for being connected with an execution assembly, the high-pressure valve group can introduce high-pressure hydraulic oil obtained by pressurizing the hydraulic oil into the execution assembly, the low-pressure valve group can introduce low-pressure hydraulic oil obtained by depressurizing the hydraulic oil into the execution assembly, and the high-pressure hydraulic oil or the low-pressure hydraulic oil in the execution assembly can return to a hydraulic station through the internal channel of the oil circuit board and the oil return port;
the high-pressure valve bank can output a high-pressure compression control signal to the execution assembly through the electrical control system, the low-pressure valve bank can output a low-pressure compression control signal to the execution assembly through the electrical control system, and the high-pressure valve bank and the low-pressure valve bank are matched to further realize a pressure maintaining function and a pressure releasing function.
Compared with the prior art, the hydraulic clamp pressing control system provided by the embodiment of the invention is based on fluid transmission and electrical control. The high-pressure valve bank, the low-pressure valve bank and the matching of the high-pressure valve bank and the low-pressure valve bank can realize high-pressure, low-pressure, pressure maintaining and pressure relief control of the clamp, can perform automatic pressure switching and detection, has the advantages of matching with the feeding and discharging of a mechanical arm, can save the advantages of an anti-falling mechanism or an auxiliary pressing mechanism on the clamp, reduces workpiece deformation, and improves the processing precision and the processing efficiency.
As shown in fig. 1, the actuating assemblies include a first actuating assembly 11 and a second actuating assembly 12, the output ends of the high-pressure valve set are respectively connected to the first actuating assembly 11 and the second actuating assembly 12, and the output ends of the low-pressure valve set are respectively connected to the first actuating assembly 11 and the second actuating assembly 12.
It should be noted that the second actuating assembly 12 and the first actuating assembly 11 may be pressing cylinders on the clamp in the embodiment of the present invention.
Specifically, as shown in fig. 1, the high pressure valve block includes: first pressure switch valve 1, first pilot operated check valve 2, high pressure relief valve 3 and first switching valve 4, first pressure switch valve 1 with oil circuit board 9 is connected, first pilot operated check valve and 2 first pressure switch valve 1 is connected, high pressure relief valve 3 with first pilot operated check valve 2 is connected, first switching valve 4 with high pressure relief valve 3 is connected, the hydraulic oil that supplies oil port P1 to get into can be followed first pressure switch valve 1 and the entering of first pilot operated check valve 2 high pressure relief valve 3, high pressure relief valve 3 can be right hydraulic oil reduces pressure, then passes through first switching valve 4 high pressure relief valve 3, first pilot operated check valve 2 and first pressure switch valve 1 enters into first execution component 11 and second execution component 12.
Further specifically, the first pressure switch valve 1 includes a first pressure switch 1.1 and a second pressure switch 1.2, and the first pressure switch 1.1 and the second pressure switch 1.2 are both used for detecting the pressure of the oil path between the high-pressure valve group and the actuating assembly.
Further specifically, the first reversing valve 4 includes a first electromagnet 4.1 and a second electromagnet 4.2, and the first electromagnet 4.1 and the second electromagnet 4.2 are used for controlling the reversing of the oil path of the high-pressure valve bank.
Specifically, as shown in fig. 1, the low pressure valve group comprises a second direction changing valve 5, a low pressure reducing valve 6, a second hydraulic control check valve 7 and a second pressure switch valve 8, the second pressure switch valve 8 is connected with the oil circuit board 9, the second hydraulic control one-way valve 7 is connected with the second pressure switch valve 8, the low-pressure reducing valve 6 is connected with the second hydraulic control one-way valve 7, the second reversing valve 5 is connected with the low-pressure reducing valve 6, the hydraulic oil entering from the oil supply port can enter the low-pressure reducing valve 6 along the second pressure switch valve 8 and the second hydraulic control one-way valve 7, and enters the second reversing valve 5 after being reduced in pressure by the low-pressure reducing valve 6, then enters the first actuating assembly 11 and the second actuating assembly 12 through the low-pressure reducing valve 6, the second hydraulic check valve 7 and the second pressure switching valve 8.
Further specifically, the second pressure switch valve 8 includes a third pressure switch 8.1 and a fourth pressure switch 8.2, and both the third pressure switch 8.1 and the fourth pressure switch 8.2 are used for detecting the pressure of the oil path between the low pressure valve group and the actuating assembly.
Further specifically, the second reversing valve 5 includes a third electromagnet 5.1 and a fourth electromagnet 5.2, and the third electromagnet 5.1 and the fourth electromagnet 5.2 are used for controlling the reversing of the oil path of the low-pressure valve group.
Specifically, the first reversing valve 4, the second reversing valve 5, the first hydraulic control one-way valve 2 and the second hydraulic control one-way valve 7 jointly act to realize pressure maintaining or pressure relief in the high-pressure valve bank, the low-pressure valve bank and the oil circuit board.
Specifically, the hydraulic clamp pressing control system further comprises an accumulator 10, and the accumulator 10 is connected with the A1 oil path of the high-pressure valve group and the A2 oil path of the low-pressure valve group respectively.
Specifically, in order to realize the expansion of the valve group, the other end of the oil circuit board 9 is provided with a detachable blocking structure.
The specific operation of the hydraulic clamp pressing control system according to the embodiment of the present invention will be described in detail with reference to fig. 1.
In this embodiment, the second actuator 12 and the first actuator 11 are both described by taking a pressing cylinder as an example.
As shown in fig. 1, the hydraulic clamp pressing control system is composed of a first pressure switch valve 1, a first hydraulic control one-way valve 2, a high-pressure reducing valve 3, a first reversing valve 4, a second reversing valve 5, a low-pressure reducing valve 6, a second hydraulic control one-way valve 7, a second pressure switch valve 8, an oil circuit board 9, an energy accumulator 10, a second pressing cylinder 11, a first pressing cylinder 12 and other components.
The components such as the first pressure switch valve 1, the first hydraulic control one-way valve 2, the high-pressure reducing valve 3, the first reversing valve 4, the second reversing valve 5, the low-pressure reducing valve 6, the second hydraulic control one-way valve 7, the second pressure switch valve 8 and the like are arranged on the oil circuit board 9. The oil channel plate 9 is fixed on the hydraulic station, and the left side of the oil channel plate 9 is respectively connected with an oil supply port (P1) and an oil return port (T1) of the hydraulic station. The right side oil circuit plug of oil circuit board 9 can be opened when needs, connects other oil circuit boards in series, expands the valves. P1 is a hydraulic oil path supplied from the oil pump side of the hydraulic station, and is introduced from the left side of the oil path plate 9, and is introduced into the control valve block through a passage inside the oil path plate 9. The port T1 is an oil passage connected to the oil tank of the hydraulic station, and oil returning from the inside of the actuator to the oil tank is led back to the oil tank through the internal passage of the oil passage plate 9 and the oil passage T1. The energy accumulator 10, the second pressing cylinder 11, the first pressing cylinder 12 and other components are installed on the clamp. The first pressure switch valve 1, the first hydraulic control one-way valve 2, the high-pressure reducing valve 3 and the first reversing valve 4 are a group of valves and are arranged on the left side of the oil circuit board 9. The second reversing valve 5, the low-pressure reducing valve 6, the second hydraulic control one-way valve 7 and the second pressure switch valve 8 are another group of valves and are arranged on the right side of the oil circuit board 9. The set pressure of the high pressure reducing valve 3 is greater than the set pressure of the low pressure reducing valve 6.
Specifically, the first pressure switch valve 1 has two pressure switches, namely, a left first pressure switch 1.1 and a right second pressure switch 1.2 (it should be understood that both the left and right sides in this embodiment of the present invention are illustrated in fig. 1), which are respectively connected to the B1 oil path and the a1 oil path. The pressure sensor is used for detecting the pressure of the B1 oil path and the A1 oil path and feeding back signals to a control system (the control system can be a PLC system in particular). Similarly, the second pressure switch valve 8 has two pressure switches, a third pressure switch 8.1 on the left side and a fourth pressure switch 8.2 on the right side, which are connected to the B2 oil path and the a2 oil path, respectively. The pressure of the oil circuit B2 and the oil circuit A2 are detected, and signals are fed back to the control system. The first reversing valve 4 is a Y-shaped three-position four-way reversing valve, and is provided with two electromagnets, namely a first electromagnet 4.1 on the left side and a second electromagnet 4.2 on the right side, which are used for controlling the reversing of the oil circuit of the left valve bank. The second reversing valve 5 is a Y-shaped three-position four-way reversing valve, and is provided with two electromagnets, namely a third electromagnet 5.1 on the left side and a fourth electromagnet 5.2 on the right side, and the electromagnets are used for controlling the reversing of the oil circuit of the right valve group.
P1 is a hydraulic oil path supplied from the hydraulic station oil pump side, and P1 enters the insides of the left and right valve sets, respectively, via internal passages of the oil path plate 9. The P1 enters the inlet of the high-pressure reducing valve 3 along the passage inside the first pressure switch valve 1 and the first pilot-controlled check valve 2, is reduced in pressure by the high-pressure reducing valve 3, and then enters the inlet of the first reversing valve 4. The outlets of the first reversing valve 4 are respectively provided with an A1 oil circuit and a B1 oil circuit. The A1 oil path is led out through the internal paths of the first reversing valve 4, the pressure reducing valve 3, the hydraulic one-way valve 2, the first pressure switch valve 1 and the oil path plate 9. The second pressure switch 1.2 on the right side of the first pressure switch valve 1 is communicated with the oil path A1, and the pressure of the oil path A1 can be detected. The first pilot-controlled check valve 2 is connected in series with the A1 oil path and is used for maintaining the pressure of the A1 oil path. The first pilot operated check valve 2 on the a1 circuit can be opened by the pressurized oil of the B1 circuit. The B1 oil path is led out through the internal paths of the first reversing valve 4, the high-pressure reducing valve 3, the hydraulic one-way valve 2, the first pressure switch valve 1 and the oil path plate 9. The first pressure switch 1.1 on the left side of the first pressure switch valve 1 is connected with the oil path B1, and the pressure of the oil path B1 can be detected.
Similarly, P1 enters the inlet of the low pressure reducing valve 6 along the internal passages of the second pressure switching valve 8 and the second hydraulic check valve 7, is reduced in pressure by the low pressure reducing valve 6, and then enters the inlet of the second direction changing valve 5. The outlets of the second reversing valve 5 are respectively provided with an A2 oil circuit and a B2 oil circuit. The A2 oil path is led out through the internal passages of the second reversing valve 5, the low-pressure reducing valve 6, the second hydraulic control one-way valve 7, the second pressure switch valve 8 and the oil path plate 9. The fourth pressure switch 8.2 on the right side of the second pressure switch valve 8 is connected with the oil passage A2, and the pressure of the oil passage A2 can be detected. The first pilot-controlled check valve 2 is connected in series with the A2 oil path and is used for maintaining the pressure of the A2 oil path. The second hydraulic check valve 7 on the a2 loop can be opened by the pressure oil of the B2 loop. The B2 oil path is led out to the oil path plate through the internal passages of the second reversing valve 5, the low-pressure reducing valve 6, the second hydraulic control one-way valve 7, the second pressure switch valve 8 and the oil path plate 9 and then is blocked and is not led out continuously.
The third pressure switch 8.1 on the left side of the second pressure switch valve 8 is communicated with the oil path B2, and the pressure of the oil path B2 can be detected. After the a1 oil path and the a2 oil path are communicated with each other outside the oil path plate 9, the oil paths are led into the pressing side oil ports of the second pressing cylinder 11 and the first pressing cylinder 12 on the clamp. The B1 oil path is led into the unclamping side oil ports of the second pressing cylinder 11 and the first pressing cylinder 12. The accumulators 10 are connected in parallel to the oil paths A1 and A2 to compensate for pressure loss or absorb pressure fluctuations.
In a normal state, the first electromagnet 4.1 and the second electromagnet 4.2 of the first reversing valve 4 and the first electromagnet 5.1 and the second electromagnet 5.2 of the second reversing valve 5 are all de-energized, and the first reversing valve 4 and the second reversing valve 5 are both in a neutral state. After a workpiece is placed on the clamp by the manipulator, the second electromagnet 5.2 on the right side of the second reversing valve 5 is electrified, the passage of the second reversing valve 5 is switched to the passage on the right side, low-pressure oil of the passage A2 decompressed by the low-pressure decompression valve 6 enters the compressing side of the second compressing cylinder 11 and the first compressing cylinder 12, and the workpiece is compressed by the second compressing cylinder 11 and the first compressing cylinder 12. After the low-pressure oil pressure of the passage A2 decompressed by the low-pressure decompression valve 6 reaches a certain level, the fourth pressure switch 8.2 on the right side of the second pressure switch valve 8 communicated with the oil passage A2 sends out a signal, and the first pressing cylinder 12 and the second pressing cylinder 11 are used for pressing the workpiece at a low pressure. Since the set pressure of the high pressure reducing valve 3 in the a1 oil passage is higher than the set pressure of the low pressure reducing valve 6 in the a2 oil passage, the pressure switch on the right side of the second pressure switching valve 8 on the a2 oil passage side connected to the a1 oil passage is not actuated, and no signal is sent.
After the pressure of the A1 loop is stabilized, the first hydraulic check valve 2 is closed under the action of the internal spring. And after the machine tool electrical control system obtains a signal sent by a fourth pressure switch 8.2 on the right side of the second pressure switch valve 8 communicated with the A2 oil way, the machine tool electrical control system controls the second electromagnet 5.2 on the right side of the second reversing valve 5 to lose power. The second reversing valve 5 returns to the middle position, and under the action of the second hydraulic control one-way valve 7, the low-pressure oil maintains the pressure, and meanwhile, the machine tool electrical control system prompts the manipulator to be removed. After the manipulator is removed, the first electromagnet 5.1 on the left side of the second reversing valve 5 is electrified, the second reversing valve 5 is switched to a left passage, low-pressure oil of a B2 oil passage decompressed by the low-pressure decompression valve 6 is led to a control port of the second hydraulic one-way valve 7, the second hydraulic one-way valve 7 is opened, and a third pressure switch 8.1 on the left side of a second pressure switch valve 8 communicated with a B2 oil passage sends a signal to indicate that the second hydraulic one-way valve 7 is opened.
The low-pressure oil in the communicating oil passages A1 and A2 and the accumulator 10 returns through the left passage of the second reversing valve 5, and returns to the oil tank of the hydraulic station through the T1 oil passage through the second reversing valve 5, the low-pressure reducing valve 6, the second hydraulic control one-way valve 7, the second pressure switch valve 8 and the internal passage of the oil passage plate 9. The A2 oil path is decompressed. The signal of the fourth pressure switch 8.2 on the right side of the second pressure switch valve 8 on the oil path side of a2 disappears, indicating that the oil path a2 is depressurized. The friction force between the cylinder body and the piston rod of the second pressing cylinder 11 keeps the piston rod of the second pressing cylinder 11 still and continues to contact with the workpiece, and the friction force between the cylinder body and the piston rod of the first pressing cylinder 12 keeps the piston rod of the first pressing cylinder 12 still and continues to contact with the workpiece, so that the workpiece is prevented from overturning or shaking under the disturbance of external force.
And after the electrical control system of the machine tool obtains the pressure switch signal, the electrical control system sends a signal to control the movement of the positioning mechanism of the clamp so as to position the workpiece at the correct position. Then, the first electromagnet 5.1 on the left side of the second reversing valve 5 loses power, the second reversing valve 5 returns to the middle position, and the second hydraulic control one-way valve 7 is closed under the action of an internal spring. The second electromagnet 4.2 on the right side of the first reversing valve 4 is electrified, and high-pressure oil of an A1 passage decompressed by the high-pressure decompression valve 3 enters the second pressing cylinder 11 and the first pressing cylinder 12 to press a workpiece. The accumulator 10 is used for absorbing pressure impact at the moment of oil supply of the A1 oil way and accumulating energy. After the high-pressure oil pressure of the passage A1 decompressed by the high-pressure decompression valve 3 reaches a certain level, the second pressure switch 1.2 on the right side of the first pressure switch valve 1 communicated with the oil passage A1 sends out a signal to indicate that the second pressing cylinder 11 and the first pressing cylinder 12 have pressed the workpiece. After the pressure of the a1 oil path is stabilized, the first pilot-operated check valve 2 is closed by the internal spring.
Similarly, since the pressure oil from port a1 is higher than the pressure oil from port a2, the fourth pressure switch 8.2 on the right side of the second pressure switch valve 8 on the a2 oil path side, which is interconnected with the a1 oil path, also signals. After the machine tool electrical control system obtains the pressure switch signal, the second electromagnet 4.2 on the right side of the first reversing valve 4 is controlled to lose power, the first hydraulic control one-way valve 2 keeps the pressure in the clamp pressing loop, and the action of other loops is prevented from interfering the pressing loop. The accumulator 9 is used for compensating pressure loss caused by internal leakage or external leakage of the compression circuit, and the stability of system pressure is ensured. The machine then begins to rough the workpiece.
After rough machining is finished, the machine tool electrical control system (specifically, a PLC system) controls the first electromagnet 5.1 on the left side of the second reversing valve 5 to be electrified, the second reversing valve 5 is switched to a left-side passage, low-pressure oil of a B2 oil path decompressed by the low-pressure reducing valve 6 is led to a control port of the second hydraulic one-way valve 7, the second hydraulic one-way valve 7 is opened, and a third pressure switch 8.1 on the left side of a second pressure switch valve 8 communicated with the B2 oil path sends a signal to indicate that the second hydraulic one-way valve 7 is opened. The oil passages communicated with the A1 and the A2 and the high-pressure oil in the accumulator 9 flow to the oil passage T1 through the left passage of the second reversing valve 5 and return to the oil tank, and the oil passages A1 and A2 are decompressed. The signal of the second pressure switch 1.2 on the right side of the first pressure switch valve 1, which is connected to the a1 oil path, disappears, and the signal of the fourth pressure switch 8.2 on the right side of the second pressure switch valve 8, which is connected to the a2 oil path, also disappears, indicating that the a1 and a2 oil paths are depressurized. The decompression of the compression system is used to release the elastic deformation of the workpiece.
After the elastic deformation of the workpiece is released, the machine tool electrical control system controls the second electromagnet 5.2 on the right side of the second reversing valve 5 to be electrified, low-pressure oil of an A2 oil way after being decompressed by the low-pressure decompression valve 6 passes through the second hydraulic control one-way valve 7 and then enters the compressing side of the second compressing cylinder 11 and the first compressing cylinder 12, and the workpiece is compressed by the low-pressure second compressing cylinder 11 and the first compressing cylinder 12. The fourth pressure switch 8.2 on the right of the second pressure switch valve 8, which is now connected to the a2 oil circuit, signals that the low pressure is in place. Since the set pressure of the low-pressure relief valve 6 is lower than the set pressure of the high-pressure relief valve 3, the second pressure switch 1.2 on the right of the first pressure switch valve 1 is not signaled. After the pressure of the a2 oil path is stabilized, the second hydraulic check valve 7 is closed by the internal spring. After the machine tool electrical control system receives the signals, the second electromagnet 5.2 on the right side of the second reversing valve 5 is controlled to lose power, the second reversing valve 5 returns to the middle position, and the second hydraulic control one-way valve 7 keeps the pressure in the clamp pressing loop, so that the action of other loops is prevented from interfering the pressing loop. The accumulator 9 is used to compensate for pressure losses caused by internal or external leakages of the hydraulic system. And the stability of the system pressure is ensured. The machine tool begins to finish the workpiece.
After finishing, the machine tool electrical control system notifies the manipulator to remove the workpiece. When the manipulator grabs the workpiece, the machine tool electrical control system controls the first electromagnet 5.1 on the left side of the second reversing valve 5 to be electrified. The low-pressure oil in the B2 oil path decompressed by the low-pressure decompression valve 6 enters the releasing sides of the second pressing cylinder 11 and the first pressing cylinder 12, and the second pressing cylinder 11 and the first pressing cylinder 12 are released. The third pressure switch 8.1 on the left of the second pressure switch valve 8, which is connected to the B2 oil passage, signals that the B2 oil passage low pressure is in place. And after the electrical control system of the machine tool receives the signal, the mechanical arm takes the workpiece off the clamp. The process cycle is complete.
After the workpiece is loaded, the clamp compresses the workpiece by adopting low pressure, and then the manipulator is removed, so that the clamp and the manipulator are protected. If the manipulator interferes with the clamp in the evacuation process, the workpiece compressed by low pressure can be driven by the manipulator to move in a proper amount, and the serious damage of the manipulator and parts on the clamp in the forced evacuation process of the manipulator is avoided.
During rough machining, the workpiece is pressed by adopting high pressure maintaining, and then the oil way is pressed for pressure relief. After rough machining of the workpiece, new elastic deformation and plastic deformation are generated due to redistribution of residual stress in the workpiece. The pressure relief of the compression circuit enables the workpiece to release elastic deformation. And then, pressing the workpiece under the condition of low pressure and maintaining pressure for finish machining. Therefore, the processing quality of the workpiece can be greatly improved. The pressure-maintaining clamping loop can avoid the interference of the actions of other loops of the hydraulic station on the pressing loop and keep the pressure of the pressing system stable.
In some more complex situations, such as loading and robot evacuation, the workpiece needs to be first decompressed and positioned, then low-pressure pre-pressed, the auxiliary support cylinder is raised in place, then high-pressure pressing rough machining is performed, and then low-pressure pressing fine machining is performed, the control mode is the same. Only after the pressure relief positioning, the processes of low-pressure compression and low-pressure high-pressure change are added. The control system is equally applicable.
In summary, the hydraulic clamp compression control system provided by the embodiment of the present invention realizes different output pressures through the high pressure reducing valve 3 and the low pressure reducing valve 6. And the system oil way is switched by the power on and power off of the electromagnets of the first reversing valve 4 and the second reversing valve 5. The combination of the first pilot operated check valve 2 and the second pilot operated check valve 7 is used to maintain the system pressure by the neutral Y-shaped function of the first direction valve 4 and the second direction valve 5. The pressure switching and pressure maintaining control of the hydraulic clamp pressing loop are realized by combining power on and power off control of different electromagnets of the first reversing valve 4 and the second reversing valve 5, matching with the pressure setting of the high-pressure reducing valve 3 and the low-pressure reducing valve 6 and the pressure setting of the high-pressure reducing valve 3 and the low-pressure reducing valve 6. The system pressure is detected by the first pressure switch valve 1 and the second pressure switch valve 8 and fed back to the control system. Therefore, compared with the prior art, the hydraulic transmission and the electric control are both based on. Utilizing the reversibility of the reversing valve; the pressure-adjustable performance of the pressure reducing valve; pressure detection and signal feedback of the pressure switch; the hydraulic control one-way valve automatically opens and closes the performance of the one-way valve along with the pressure on-off of the control oil port, and the pressure control of the hydraulic clamp pressing loop is realized by combining the control of power on and power off of the electromagnet of the reversing valve.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A hydraulic clamp compression control system, comprising: the hydraulic system comprises an oil circuit board, a high-pressure valve bank and a low-pressure valve bank, wherein the high-pressure valve bank and the low-pressure valve bank are both arranged on the oil circuit board, one end of the oil circuit board is connected with an oil supply port and an oil return port of a hydraulic station, hydraulic oil entering from the oil supply port can respectively enter the high-pressure valve bank and the low-pressure valve bank through an internal channel of the oil circuit board, and the output end of the high-pressure valve bank is communicated with the output end of the low-;
the output end of the high-pressure valve group and the output end of the low-pressure valve group are both used for being connected with an execution assembly, the high-pressure valve group can introduce high-pressure hydraulic oil obtained by pressurizing the hydraulic oil into the execution assembly, the low-pressure valve group can introduce low-pressure hydraulic oil obtained by depressurizing the hydraulic oil into the execution assembly, and the high-pressure hydraulic oil or the low-pressure hydraulic oil in the execution assembly can return to a hydraulic station through the internal channel of the oil circuit board and the oil return port;
the high-pressure valve bank can be right through the electrical control system the executive component outputs high-pressure oil, the low-pressure valve bank can be right through the electrical control system the executive component outputs low-pressure oil, and the high-pressure valve bank and the low-pressure valve bank are matched to further realize a pressure maintaining function and a pressure releasing function.
2. The hydraulic clamp compression control system of claim 1, wherein the high pressure valve block includes: first pressure switch valve, first pilot operated check valve, high pressure relief valve and first switching-over valve, first pressure switch valve with the oil circuit board is connected, first pilot operated check valve with first pressure switch valve is connected, high pressure relief valve with first pilot operated check valve is connected, first switching-over valve with high pressure relief valve is connected, the hydraulic oil that supplies the mouth to get into can be followed first pressure switch valve and first pilot operated check valve get into high pressure relief valve, high pressure relief valve can be right hydraulic oil reduces pressure, then passes through first switching-over valve high pressure relief valve, first pilot operated check valve with first pressure switch valve enters into the executive component.
3. The hydraulic clamp compression control system of claim 2, wherein the first pressure switch valve includes a first pressure switch and a second pressure switch, each for sensing pressure of an oil path between the high pressure valve block and the actuator assembly.
4. The hydraulic clamp compression control system of claim 2, wherein the first reversing valve includes a first solenoid and a second solenoid for controlling the reversing of the oil path of the high pressure valve block.
5. The hydraulic clamp pressing control system according to claim 2, wherein the low-pressure valve group includes a second directional valve, a low-pressure reducing valve, a second hydraulic check valve and a second pressure switch valve, the second pressure switch valve is connected to the oil circuit board, the second hydraulic check valve is connected to the second pressure switch valve, the low-pressure reducing valve is connected to the second hydraulic check valve, the second directional valve is connected to the low-pressure reducing valve, hydraulic oil entering from the oil supply port can enter the low-pressure reducing valve along the second pressure switch valve and the second hydraulic check valve, enters the second directional valve after being reduced in pressure by the low-pressure reducing valve, and then enters the actuator assembly through the low-pressure reducing valve, the second hydraulic check valve and the second pressure switch valve.
6. The hydraulic clamp compression control system of claim 5, wherein the second pressure switch valve includes a third pressure switch and a fourth pressure switch, each for sensing pressure in an oil path between the low pressure valve block and the actuator assembly.
7. The hydraulic clamp compression control system of claim 5, wherein the second reversing valve includes a third solenoid and a fourth solenoid for controlling the reversing of the oil path of the low pressure valve block.
8. The hydraulic clamp compression control system of claim 5, wherein the first and second directional valves, the first and second hydraulically controlled check valves cooperate to maintain pressure or relieve pressure in the high and low pressure valve banks and the oil circuit board.
9. The hydraulic clamp compression control system of claim 1, further comprising an accumulator connected to the oil passage of the high pressure valve block and the oil passage of the low pressure valve block, respectively.
10. The hydraulic clamp compression control system of claim 1, wherein the other end of the oil circuit board is provided with a removable blocking structure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010300134.0A CN111379752A (en) | 2020-04-16 | 2020-04-16 | Hydraulic clamp compression control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010300134.0A CN111379752A (en) | 2020-04-16 | 2020-04-16 | Hydraulic clamp compression control system |
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| CN111379752A true CN111379752A (en) | 2020-07-07 |
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| CN202010300134.0A Pending CN111379752A (en) | 2020-04-16 | 2020-04-16 | Hydraulic clamp compression control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111928042A (en) * | 2020-08-18 | 2020-11-13 | 安徽鲲鹏装备模具制造有限公司 | Automatic pressure relief system convenient for quick connector to be plugged |
| CN113565820A (en) * | 2021-08-11 | 2021-10-29 | 浙江旭昌昇装备科技有限公司 | Injection molding machine mould neutron pressurize pressure release oil piping system |
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| CN208106866U (en) * | 2018-04-23 | 2018-11-16 | 邯郸钢铁集团有限责任公司 | A kind of straightener balance hydraulic cylinder control valve group |
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2020
- 2020-04-16 CN CN202010300134.0A patent/CN111379752A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN208106866U (en) * | 2018-04-23 | 2018-11-16 | 邯郸钢铁集团有限责任公司 | A kind of straightener balance hydraulic cylinder control valve group |
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| 谢群等: "《液压与气压传动 第2版》", 30 April 2015, pages: 151 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111928042A (en) * | 2020-08-18 | 2020-11-13 | 安徽鲲鹏装备模具制造有限公司 | Automatic pressure relief system convenient for quick connector to be plugged |
| CN113565820A (en) * | 2021-08-11 | 2021-10-29 | 浙江旭昌昇装备科技有限公司 | Injection molding machine mould neutron pressurize pressure release oil piping system |
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Application publication date: 20200707 |