CN114687980A - Pumping equipment, pumping system and reversing parameter adjusting method thereof - Google Patents
Pumping equipment, pumping system and reversing parameter adjusting method thereof Download PDFInfo
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- CN114687980A CN114687980A CN202011593842.4A CN202011593842A CN114687980A CN 114687980 A CN114687980 A CN 114687980A CN 202011593842 A CN202011593842 A CN 202011593842A CN 114687980 A CN114687980 A CN 114687980A
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- 238000005086 pumping Methods 0.000 title claims abstract description 199
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000006698 induction Effects 0.000 claims abstract description 88
- 230000001939 inductive effect Effects 0.000 claims description 30
- 230000003139 buffering effect Effects 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 3
- 125000006850 spacer group Chemical group 0.000 abstract description 13
- 230000001960 triggered effect Effects 0.000 description 14
- 239000000463 material Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000001976 improved effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/34—Control not provided for in groups F04B1/02, F04B1/03, F04B1/06 or F04B1/26
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/02—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having two cylinders
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- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention provides pumping equipment, a pumping system and a reversing parameter adjusting method thereof, wherein the pumping system comprises a hydraulic driving unit, a control unit, an induction sensor and a pumping oil cylinder; the induction sensor is arranged at the reversing position of one end of the pumping oil cylinder corresponding to the piston of the pumping oil cylinder; the rear end of a piston rod of the pumping oil cylinder is connected with a piston, a first induction area and a second induction area are arranged on one side, close to the induction sensor, of the rear end of the piston rod, and the first induction area and the second induction area are arranged at intervals along the axial direction of the piston rod; the hydraulic driving unit is communicated with the pumping oil cylinder, and the control unit is electrically connected with the hydraulic driving unit and the induction sensor. By forming the spacer area and the two induction areas on the piston rod, the control unit can adjust the reversing buffer time of the next reversing period based on the number of the trigger signals received in the current reversing period, thereby automatically correcting the stroke deviation of the oil cylinder and avoiding the problem of too early reversing or too late reversing of the pumping oil cylinder.
Description
Technical Field
The invention relates to the technical field of material pumping, in particular to pumping equipment, a pumping system and a reversing parameter adjusting method thereof.
Background
Pumping equipment (such as a pump truck, a trailer pump, a vehicle-mounted pump, a fire engine and the like) is a mechanical device for conveying fluid (or slurry) materials to a preset position after pressurization, has the advantages of high operation efficiency, convenience in movement and the like, and is widely applied to engineering construction. The pumping equipment mainly comprises a tilt cylinder, a hydraulic pump, a reversing valve, two main oil cylinders and the like, and continuous pumping of the pumping equipment is realized through the matching of the tilt cylinder and the two main oil cylinders. In the pumping process, the reversing of the master cylinder is usually required to be accurately controlled, the reversing parameters of the existing pumping equipment are fixed, and when the load of the equipment changes, the fixed reversing parameters can cause the problem that the master cylinder is reversed too early or too late. If the reversing is too early, the stroke of the main oil cylinder is short, the stroke of the main oil cylinder is not fully utilized, the displacement of a pumping system is reduced, the work efficiency is not improved, and the reversing for more times is needed for completing the pumping of materials with the same volume, so the service life of the pumping system is reduced; if the direction is reversed too late, the master cylinder can generate a cylinder collision phenomenon (namely, a piston collides a cylinder body), mechanical loss and hydraulic impact are caused, and the service life of a pumping system can be shortened.
Disclosure of Invention
The invention provides pumping equipment, a pumping system and a reversing parameter adjusting method thereof, which are used for solving the problem that the reversing parameter of the conventional pumping equipment is fixed, so that the main oil cylinder is reversed too early or too late.
The invention provides a pumping system, which comprises a hydraulic driving unit, a control unit, an induction sensor and a pumping oil cylinder, wherein the hydraulic driving unit is connected with the control unit;
the induction sensor is arranged at a reversing position corresponding to the piston of the pumping oil cylinder and at one end of the pumping oil cylinder;
the rear end of a piston rod of the pumping oil cylinder is connected with the piston, a first induction area and a second induction area are arranged on one side, close to the induction sensor, of the rear end of the piston rod and are used for triggering the induction sensor to generate a trigger signal, and the first induction area and the second induction area are arranged at intervals along the axial direction of the piston rod so as to form a spacing area between the first induction area and the second induction area;
the induction sensor is opposite to the interval area under the condition that the piston runs to the reversing position of one end of the pumping oil cylinder;
the hydraulic driving unit is communicated with the pumping oil cylinder, and the control unit is electrically connected with the hydraulic driving unit and the induction sensor.
According to the pumping system provided by the embodiment of the invention, the pumping oil cylinder comprises a first pumping oil cylinder and a second pumping oil cylinder which are arranged in a linkage manner, and the induction sensor comprises a first induction sensor arranged corresponding to the first pumping oil cylinder and a second induction sensor arranged corresponding to the second pumping oil cylinder; or
The inductive sensor comprises a first inductive sensor and a second inductive sensor, the first inductive sensor is corresponding to the piston of the pumping oil cylinder and is arranged at the reversing position of the front end of the pumping oil cylinder, and the second inductive sensor is corresponding to the piston of the pumping oil cylinder and is arranged at the reversing position of the rear end of the pumping oil cylinder.
According to the pumping system of one embodiment of the invention, the rodless cavity of the first pumping cylinder is communicated with the rodless cavity of the second pumping cylinder; the rod cavity of the first pumping oil cylinder and the rod cavity of the second pumping oil cylinder are both communicated with the hydraulic driving unit; or,
the rod cavity of the first pumping oil cylinder is communicated with the rod cavity of the second pumping oil cylinder; and the rodless cavity of the first pumping oil cylinder and the rodless cavity of the second pumping oil cylinder are both communicated with the hydraulic driving unit.
According to the pumping system provided by the embodiment of the invention, the induction sensor is arranged at the front end of the pumping oil cylinder.
According to the pumping system of one embodiment of the invention, the induction sensor is a proximity switch arranged on the pumping oil cylinder;
one side of the rear end of the piston rod, which is close to the proximity switch, is provided with a first protruding part and a second protruding part so as to form the first induction area and the second induction area respectively.
According to the pumping system of one embodiment of the invention, the outside of the rear end of the piston rod is sleeved with an annular induction block;
the induction block is provided with a groove to form the interval area, and the front wall and the rear wall of the groove form the first induction area and the second induction area respectively.
According to the pumping system of one embodiment of the present invention, the hydraulic drive unit includes a reversing valve and an overflow valve;
the reversing valve is communicated with the pumping oil cylinder, an oil inlet of the reversing valve is communicated with the overflow valve through an oil inlet pipeline, and a pressure sensor is arranged on the oil inlet pipeline and used for generating an oil inlet pressure signal of the reversing valve;
the control unit is electrically connected with the reversing valve, the overflow valve and the pressure sensor.
The invention also provides a pumping apparatus comprising a pumping system as described above.
The invention also provides a reversing parameter adjusting method of the pumping system, which comprises the following steps:
determining the number of trigger signals received in the current commutation period;
and adjusting the commutation buffer time of the next commutation period based on the number of the trigger signals received in the current commutation period.
According to an embodiment of the present invention, the method for adjusting commutation parameters of a pumping system, wherein adjusting the commutation buffer time of the next commutation period based on the number of trigger signals received in the current commutation period includes:
if the number of the trigger signals received in the current commutation period is N1, determining the commutation buffer time of the next commutation period to be T1;
if the number of the trigger signals received in the current commutation period is N2, determining the commutation buffer time of the next commutation period to be T2;
if the number of the trigger signals received in the current commutation period is N3, determining the commutation buffer time of the next commutation period to be T3;
wherein N1, N2 and N3 are positive integers, and N1 is more than N2 and more than N3.
According to an embodiment of the present invention, before adjusting the commutation buffer time of the next commutation period based on the number of trigger signals received in the current commutation period, the method further includes:
acquiring an oil inlet pressure signal of the current reversing period;
determining the type of pressure impact of the current reversing period based on the oil inlet pressure signal of the current reversing period, wherein the pressure impact comprises cylinder impact and valve core neutral position impact;
and if the pressure impact of the current reversing period is determined to be the valve core middle position impact, increasing the overflow valve power-off buffering time of the next reversing period.
According to an embodiment of the present invention, if the number of trigger signals received in the current commutation period is N3, the determining that the commutation buffer time of the next commutation period is T3 includes:
and under the condition that the pressure impact of the current reversing period is determined to be the impact of the collision cylinder, if the pressure value of the oil inlet of the current reversing period is greater than the pressure threshold value and the number of the trigger signals received in the current reversing period is N3, determining the reversing buffer time of the next reversing period to be T3.
According to the pumping equipment, the pumping system and the pumping method, the spacer area and the two induction areas are formed on the piston rod, and the control unit can adjust the reversing buffer time of the next reversing period based on the number of the trigger signals received in the current reversing period, so that the stroke deviation of the oil cylinder is automatically corrected, and the problem that the pumping oil cylinder is reversed too early or too late is solved.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a pumping system according to the present invention;
fig. 2 is a schematic flow chart of a method for adjusting a commutation parameter of a pumping system according to the present invention.
Reference numerals are as follows:
100: a pumping system; 1: an inductive sensor; 1 a: a first inductive sensor; 1 b: a second inductive sensor; 2: a pumping cylinder; 2 a: a first pumping cylinder; 2 b: a second pumping cylinder; 21: a piston rod; 22: a first sensing region; 23: a second sensing region; 24: a spacer region; 25: an induction block; 3: a water tank.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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.
The pumping system of the present invention, which can be used for pumping equipment such as a pump truck, a trailer pump, a truck pump, a fire engine, etc., is described below with reference to fig. 1, and as shown in fig. 1, the pumping system 100 includes a hydraulic driving unit (not shown in the drawing), a control unit (not shown in the drawing), an induction sensor 1, and a pumping cylinder 2.
As shown in fig. 1, the inductive sensor 1 is disposed at a reversing position corresponding to a piston (not shown in the figure) of the pumping cylinder 2 at one end of the pumping cylinder 2; the rear end of a piston rod 21 of the pumping oil cylinder 2 is connected with a piston, a first induction area 22 and a second induction area 23 are arranged on one side, close to the induction sensor 1, of the rear end of the piston rod 21, the first induction area 22 and the second induction area 23 are used for triggering the induction sensor 1 to generate a trigger signal, and the first induction area 22 and the second induction area 23 are arranged at intervals along the axial direction of the piston rod 21 so as to form an interval area 24 between the first induction area 22 and the second induction area 23; in the event that the piston is running to a reversing position at one end of the pumping cylinder 2, the inductive sensor 1 is opposite the compartment 24.
Specifically, as shown in fig. 1, the pumping cylinder 2 generally includes a cylinder, a piston rod 21 and a piston, the piston is slidably installed in the cylinder back and forth, the rear end of the piston rod 21 is connected to the piston, and the front end of the piston rod 21 passes through the water tank 3. During one reversal cycle of the pumping cylinder 2, the piston will travel back and forth once between the front and rear ends of the cylinder.
The inductive sensor 1 is arranged at a reversing position corresponding to the piston of the pumping cylinder 2 at one end of the pumping cylinder 2, or the inductive sensor 1 is arranged at a reversing position close to the piston at the front end or the rear end of the pumping cylinder 2, and the first inductive area 22, the second inductive area 23 and the spacer area 24 are all positioned at the front side or the rear side of the piston, or are partially positioned at the front side, partially positioned at the rear side and partially positioned at the position of the piston. For example, as shown in fig. 1, the induction sensor 1 is disposed corresponding to the reversing position of the piston at the front end of the pumping cylinder 2, and the first induction area 22 is located at the front side of the second induction area 23.
The following will describe the operation principle of determining whether the stroke of the pumping cylinder 2 is normal based on the induction sensor 1, with reference to the structure of the pumping system 100 shown in fig. 1:
if only the first sensing area 22 passes through the sensing sensor 1 in a reversing period of the pumping cylinder 2, that is, the stroke of the pumping cylinder 2 is too short, that is, the pumping cylinder 2 reverses too early in the reversing period, the sensing sensor 1 is triggered only once in a round trip of the piston (the sensing sensor 1 is triggered by the first sensing area 22 in the process that the piston runs to the front end of the pumping cylinder 2), and a trigger signal is generated; if the first sensing area 22 and the spacer area 24 pass through the sensing sensor 1 in a reversing period of the pumping cylinder 2, namely the stroke of the pumping cylinder 2 is normal, the sensing sensor 1 is triggered twice in a reciprocating stroke of the piston (the sensing sensor 1 is triggered by the first sensing area 22 in the process that the piston runs to the front end of the pumping cylinder 2 (the piston moves leftwards in fig. 1), and the sensing sensor 1 is triggered by the first sensing area 22 again in the process that the piston runs to the rear end of the pumping cylinder 2 (the piston moves rightwards in fig. 1), so as to generate two trigger signals; if the first sensing area 22, the spacer area 24 and the second sensing area 23 pass through the sensing sensor 1 in a reversing period of the pumping cylinder 2, that is, the stroke of the pumping cylinder 2 is too long, that is, the pumping cylinder 2 reverses too late in the reversing period, then the sensing sensor 1 is triggered three times in a reciprocating stroke of the piston (in the process that the piston runs to the front end of the pumping cylinder 2, the sensing sensor 1 is sequentially triggered by the first sensing area 22 and the second sensing area 23, and in the process that the piston runs to the rear end of the pumping cylinder 2, the sensing sensor 1 is triggered by the first sensing area 22 again), so as to generate three trigger signals. In this way, the stroke deviation of the pumping cylinder 2 can be determined based on the number of trigger signals generated by the induction sensor 1 in one commutation period, wherein the trigger signals can be rising edge signals or falling edge signals.
The hydraulic driving unit is communicated with the pumping oil cylinder 2, and the control unit is electrically connected with the hydraulic driving unit and the induction sensor 1.
Specifically, the hydraulic drive unit is used to drive the pumping cylinder 2. In the current commutation period, after the induction sensor 1 is triggered to generate a trigger signal, the trigger signal is sent to the control unit. The control unit can determine the number of the trigger signals received in the current reversing period, and then control the hydraulic driving unit based on the number of the trigger signals received in the current reversing period so as to adjust the reversing buffer time of the next reversing period, thereby realizing the automatic correction of the stroke deviation of the pumping oil cylinder 2. For example, if the commutation buffer time of the current commutation period is T, and the control unit determines that the number of the trigger signals received in the current commutation period is 1, the control unit adjusts the commutation buffer time of the next commutation period to be T + Δ T1, that is, increases the commutation buffer time; under the condition that the control unit determines that the number of the trigger signals received in the current commutation period is 2, the control unit does not adjust the commutation buffer time of the next commutation period, namely the commutation buffer time of the next commutation period is T; in case the control unit determines that the number of trigger signals received in the current commutation period is 3, the control unit adjusts the commutation buffering time of the next commutation period to be T- Δ T2, i.e. decreases the commutation buffering time.
According to the pumping system 100 provided by the invention, the spacer region 24 and the two induction regions are formed on the piston rod 21, and the control unit can adjust the reversing buffer time of the next reversing period based on the number of the trigger signals received in the current reversing period, so that the stroke deviation of the oil cylinder is automatically corrected, and the problem of too early reversing or too late reversing of the pumping oil cylinder 2 is avoided.
The pumping device is generally provided with two pumping cylinders 2, so as shown in fig. 1, in this embodiment, the pumping cylinders 2 include a first pumping cylinder 2a and a second pumping cylinder 2b which are arranged in a linkage manner, and the induction sensor 1 includes a first induction sensor 1a arranged corresponding to the first pumping cylinder 2a and a second induction sensor 1b arranged corresponding to the second pumping cylinder 2 b.
Specifically, the first pumping cylinder 2a and the second pumping cylinder 2b are generally arranged in parallel, a piston rod 21 of the first pumping cylinder 2a is provided with a first sensing area 22 and a second sensing area 23, and the first sensing sensor 1a is used for determining whether the stroke of the first pumping cylinder 2a is normal, and simultaneously, may also be used for determining whether the reversing of the second pumping cylinder 2b at the rear end is normal. The piston rod 21 of the second pumping cylinder 2b is also provided with a first sensing area 22 and a second sensing area 23, and the second pumping cylinder 2b is used for judging whether the stroke of the second pumping cylinder 2b is normal or not and also can be used for judging whether the reversing of the first pumping cylinder 2a at the rear end is normal or not. In addition, in other embodiments of the present application, the inductive sensor 1 includes a first inductive sensor 1a and a second inductive sensor 1b, where the first inductive sensor 1a and the second inductive sensor 1b are respectively located at the front end and the rear end of the same pumping cylinder 2, and are used to determine whether the direction change of the pumping cylinder 2 at the front end and the rear end is normal.
The specific implementation manner of the linkage arrangement of the first pumping cylinder 2a and the second pumping cylinder 2b is usually set according to actual conditions, for example, in the present embodiment, in a low-pressure pumping state, the rodless cavity of the first pumping cylinder 2a is communicated with the rodless cavity of the second pumping cylinder 2 b; the rod cavity of the first pumping cylinder 2a and the rod cavity of the second pumping cylinder 2b are both communicated with a hydraulic drive unit. In a high-pressure pumping state, the rod cavity of the first pumping oil cylinder 2a is communicated with the rod cavity of the second pumping oil cylinder 2 b; the rodless cavity of the first pumping cylinder 2a and the rodless cavity of the second pumping cylinder 2b are both communicated with a hydraulic drive unit.
The induction sensor 1 is arranged at the reversing position of the piston of the corresponding pumping oil cylinder 2 at one end of the pumping oil cylinder 2, and the induction sensor 1 can be directly arranged on the pumping oil cylinder 2; the inductive sensor 1 may not be directly mounted on the pumping cylinder 2. Alternatively, as shown in fig. 1, in the present embodiment, the induction sensor 1 is disposed at the front end of the pumping cylinder 2. So that the inductive sensor 1 is less susceptible to interference.
Specifically, the first induction sensor 1a is provided at the front end of the cylinder body of the first pumping cylinder 2a, and the probe of the first induction sensor 1a faces the axis of the first pumping cylinder 2 a. The second induction sensor 1b is arranged at the front end of the cylinder body of the second pumping cylinder 2b, and the probe of the second induction sensor 1b faces the axis of the second pumping cylinder 2 b.
The first sensing area 22 and the second sensing area 23 on the piston rod 21 can trigger the inductive sensor 1 to generate a trigger signal, and the first sensing area 22 and the second sensing area 23 are specifically arranged in a manner related to the selection type of the inductive sensor 1, for example, the inductive sensor 1 is a hall switch, and the first sensing area 22 and the second sensing area 23 are both magnetic areas.
Alternatively, as shown in fig. 1, the inductive sensor 1 is a proximity switch disposed on the pumping cylinder 2; a first protrusion and a second protrusion are provided at a side of the rear end of the piston rod 21 close to the proximity switch to form a first sensing area 22 and a second sensing area 23, respectively.
Specifically, the proximity switch is arranged in a radial direction of the piston rod 21, and a probe of the proximity switch faces the piston rod 21. When the proximity switch is opposite to the piston rod 21, the piston rod 21 is positioned outside the sensing range of the proximity switch, so that the proximity switch cannot be triggered; when the proximity switch is opposite to the first sensing area 22, the first sensing area 22 is located in the sensing range of the proximity switch, so that the proximity switch is triggered to generate a trigger signal; when the proximity switch is opposite to the spacer 24, the spacer 24 is located outside the sensing range of the proximity switch, so the proximity switch cannot be triggered; when the proximity switch is opposite to the second sensing area 23, the second sensing area 23 is located in the sensing range of the proximity switch, so that the proximity switch is triggered to generate a trigger signal
Further, as shown in fig. 1, in the present embodiment, an annular sensing block 25 is sleeved outside the rear end of the piston rod 21; the sensing block 25 is provided with a recess to form a spacer region 24, the front and rear walls of the recess forming the first and second sensing regions 22 and 23, respectively. The first sensing region 22, the spacer region 24 and the second sensing region 23 are formed in a simple manner. Also, the groove is typically an annular groove.
Optionally, in this embodiment, the hydraulic drive unit includes a reversing valve and an overflow valve; the reversing valve is communicated with the pumping oil cylinder 2, an oil inlet of the reversing valve is communicated with the overflow valve through an oil inlet pipeline, and a pressure sensor is arranged on the oil inlet pipeline and used for generating an oil inlet pressure signal of the reversing valve; the control unit is electrically connected with the reversing valve, the overflow valve and the pressure sensor.
Specifically, the pressure sensor can detect the pressure of the oil inlet of the reversing valve in real time or periodically and send an oil inlet pressure signal to the control unit. When cylinder collision impact or valve core middle position impact occurs, the control unit distinguishes cylinder collision impact and valve core middle position impact based on an oil inlet pressure signal of the current reversing period. If the valve core middle position impact occurs in the current reversing period, the control unit can control the overflow valve to increase the overflow valve power-off buffering time of the next reversing period until the valve core middle position impact is eliminated to realize the protection of the reversing valve.
The invention also provides pumping equipment comprising the pumping system, wherein the pumping equipment can be a pump truck, a trailer pump, a vehicle-mounted pump, a fire engine and the like
According to the pumping equipment provided by the invention, the spacer area and the two induction areas are formed on the piston rod, and the control unit can adjust the reversing buffer time of the next reversing period based on the number of the trigger signals received in the current reversing period, so that the stroke deviation of the oil cylinder is automatically corrected, and the problem of too early reversing or too late reversing of the pumping oil cylinder is avoided.
The invention further provides a method for adjusting the reversing parameter of the pumping system, which is implemented based on the pumping system, as shown in fig. 2, and comprises steps S210 and S220.
Step S210: the number of trigger signals received in the current commutation period is determined.
Specifically, in the current commutation period, after the induction sensor is triggered to generate a trigger signal, the trigger signal is sent to the control unit. After the control unit receives the trigger signals, the control unit can determine the number of the trigger signals received in the current commutation period.
Step S220: and adjusting the commutation buffer time of the next commutation period based on the number of the trigger signals received in the current commutation period.
Specifically, when the commutation buffer time of the current commutation period is T, if the number of trigger signals received in the current commutation period is N1, for example, N1 is 1 in this embodiment, the control unit determines that the commutation buffer time of the next commutation period is T1, for example, T1 is T + Δ T1 in this embodiment; if the number of trigger signals received in the current commutation period is N2, for example, N2 is 2 in this embodiment, the control unit determines that the commutation buffer time of the next commutation period is T2, for example, T2 is T in this embodiment; if the number of trigger signals received in the current commutation period is N3, for example, N3 is 3 in this embodiment, the control unit determines that the commutation buffer time of the next commutation period is T3, for example, T3 is T- Δ T2 in this embodiment. Wherein N1, N2 and N3 are positive integers, N1 < N2 < N3, and T2 is the commutation buffer time of normal commutation. And the control unit adaptively adjusts the reversing buffer time of the next reversing period based on the number of the trigger signals received in the current reversing period until the stroke of the pumping oil cylinder is normal.
Optionally, before the control unit performs step S210, the control unit further performs: acquiring an oil inlet pressure signal of a current reversing period; determining the type of pressure impact in the current reversing period based on the pressure signal of the oil inlet in the current reversing period; and if the pressure impact of the current reversing period is determined to be the valve core middle position impact, increasing the overflow valve power-off buffering time of the next reversing period.
Specifically, the pressure impact includes cylinder impact and valve core neutral impact, and the oil inlet pressure signal may be a pressure impact oscillogram or the like. The pressure sensor can detect the pressure of the oil inlet of the reversing valve in real time or periodically and send an oil inlet pressure signal to the control unit. When cylinder collision impact or valve core middle position impact occurs, the control unit distinguishes cylinder collision impact and valve core middle position impact based on an oil inlet pressure signal of the current reversing period. If the valve core middle position impact occurs in the current reversing period, the control unit can control the overflow valve to increase the overflow valve power-off buffering time of the next reversing period until the valve core middle position impact is eliminated to realize the protection of the reversing valve.
Optionally, under the condition that it is determined that the pressure impact in the current commutation period is impact of a collision cylinder, if the pressure value of the oil inlet in the current commutation period is greater than the pressure threshold value and the number of the trigger signals received in the current commutation period is 3, it is determined that the commutation buffer time in the next commutation period is T3.
Specifically, under the condition that the control unit determines that the pressure impact in the current reversing period is the impact of cylinder collision, the control unit determines whether the stroke of the pumping oil cylinder in the current reversing period is too long or not based on the pressure value of the oil inlet in the current reversing period and the number of the trigger signals received in the current reversing period, so that the determination result is more accurate.
According to the reversing parameter adjusting method of the pumping system, the spacer area and the two induction areas are formed on the piston rod, and the control unit can adjust the reversing buffer time of the next reversing period based on the number of the trigger signals received in the current reversing period, so that the stroke deviation of the oil cylinder is automatically corrected, and the problem that the pumping oil cylinder is reversed too early or too late is solved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (12)
1. A pumping system is characterized by comprising a hydraulic driving unit, a control unit, an induction sensor and a pumping oil cylinder;
the induction sensor is arranged at a reversing position corresponding to the piston of the pumping oil cylinder and at one end of the pumping oil cylinder;
the rear end of a piston rod of the pumping oil cylinder is connected with the piston, a first induction area and a second induction area are arranged on one side, close to the induction sensor, of the rear end of the piston rod and are used for triggering the induction sensor to generate a trigger signal, and the first induction area and the second induction area are arranged at intervals along the axial direction of the piston rod so as to form a spacing area between the first induction area and the second induction area;
the induction sensor is opposite to the interval area under the condition that the piston runs to the reversing position of one end of the pumping oil cylinder;
the hydraulic driving unit is communicated with the pumping oil cylinder, and the control unit is electrically connected with the hydraulic driving unit and the induction sensor.
2. The pumping system of claim 1, wherein the pumping cylinder comprises a first pumping cylinder and a second pumping cylinder arranged in a linkage, and the inductive sensor comprises a first inductive sensor arranged corresponding to the first pumping cylinder and a second inductive sensor arranged corresponding to the second pumping cylinder; or
The induction sensor comprises a first induction sensor and a second induction sensor, the first induction sensor corresponds to the piston of the pumping oil cylinder and is arranged at the reversing position of the front end of the pumping oil cylinder, and the second induction sensor corresponds to the piston of the pumping oil cylinder and is arranged at the reversing position of the rear end of the pumping oil cylinder.
3. The pumping system of claim 1, wherein the rodless chamber of the first pumping cylinder is in communication with the rodless chamber of the second pumping cylinder; the rod cavity of the first pumping oil cylinder and the rod cavity of the second pumping oil cylinder are both communicated with the hydraulic driving unit; or,
the rod cavity of the first pumping oil cylinder is communicated with the rod cavity of the second pumping oil cylinder; and the rodless cavity of the first pumping oil cylinder and the rodless cavity of the second pumping oil cylinder are both communicated with the hydraulic driving unit.
4. The pumping system of claim 1, wherein the inductive sensor is disposed at a front end of the pumping cylinder.
5. The pumping system of claim 1, wherein the inductive sensor is a proximity switch disposed on the pumping cylinder;
one side of the rear end of the piston rod, which is close to the proximity switch, is provided with a first protruding part and a second protruding part so as to form the first induction area and the second induction area respectively.
6. The pumping system of claim 5, wherein the rear end of the piston rod is externally sleeved with an annular sensing block;
the induction block is provided with a groove to form the interval area, and the front wall and the rear wall of the groove form the first induction area and the second induction area respectively.
7. The pumping system of claim 1, wherein the hydraulic drive unit includes a reversing valve and an overflow valve;
the reversing valve is communicated with the pumping oil cylinder, an oil inlet of the reversing valve is communicated with the overflow valve through an oil inlet pipeline, and a pressure sensor is arranged on the oil inlet pipeline and used for generating an oil inlet pressure signal of the reversing valve;
the control unit is electrically connected with the reversing valve, the overflow valve and the pressure sensor.
8. A pumping apparatus comprising a pumping system according to any of claims 1 to 7.
9. A method of reversing parameter adjustment for a pumping system, comprising:
determining the number of trigger signals received in the current commutation period;
and adjusting the commutation buffer time of the next commutation period based on the number of the trigger signals received in the current commutation period.
10. The method of claim 9, wherein adjusting a commutation buffer time for a next commutation period based on the number of trigger signals received in the current commutation period comprises:
if the number of the trigger signals received in the current commutation period is N1, determining the commutation buffer time of the next commutation period to be T1;
if the number of the trigger signals received in the current commutation period is N2, determining the commutation buffer time of the next commutation period to be T2;
if the number of the trigger signals received in the current commutation period is N3, determining the commutation buffer time of the next commutation period to be T3;
wherein N1, N2 and N3 are positive integers, and N1 is more than N2 and more than N3.
11. The method of claim 10, wherein the adjusting the commutation parameter of the next commutation period based on the number of trigger signals received in the current commutation period further comprises:
acquiring an oil inlet pressure signal of the current reversing period;
determining the type of pressure impact of the current reversing period based on the oil inlet pressure signal of the current reversing period, wherein the pressure impact comprises cylinder impact and valve core neutral position impact;
and if the pressure impact of the current reversing period is determined to be the valve core middle position impact, increasing the overflow valve power-off buffering time of the next reversing period.
12. The method of claim 11, wherein if the number of trigger signals received in the current commutation period is N3, determining the commutation buffer time for the next commutation period to be T3 comprises:
and under the condition that the pressure impact of the current reversing period is determined to be the impact of the collision cylinder, if the pressure value of the oil inlet of the current reversing period is larger than the pressure threshold value and the number of the trigger signals received in the current reversing period is N3, determining the reversing buffer time of the next reversing period to be T3.
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