CN115289083A - Multistage flow plunger pump hydraulic control system and control method - Google Patents
Multistage flow plunger pump hydraulic control system and control method Download PDFInfo
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- CN115289083A CN115289083A CN202211088679.5A CN202211088679A CN115289083A CN 115289083 A CN115289083 A CN 115289083A CN 202211088679 A CN202211088679 A CN 202211088679A CN 115289083 A CN115289083 A CN 115289083A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/027—Check valves
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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
- F15B11/17—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors using two or more pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/023—Excess flow valves, e.g. for locking cylinders in case of hose burst
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/06—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention relates to a multistage flow plunger pump hydraulic control system and a control method, wherein two hydraulic pumps are provided, namely a first hydraulic pump and a second hydraulic pump, and the displacement of the first hydraulic pump is smaller than that of the second hydraulic pump; the first electromagnetic overflow valve is arranged at an oil outlet of the first hydraulic pump, and the second electromagnetic overflow valve is arranged at an oil outlet of the second hydraulic pump; the first one-way valve is arranged at an oil outlet of the first hydraulic pump, the second one-way valve is arranged at an oil outlet of the second hydraulic pump, an oil inlet of the one-way valve is connected with the hydraulic pump, and an oil outlet of the one-way valve is connected with an oil inlet of the electromagnetic reversing valve; the hydraulic cylinder is enabled to obtain three different speed stages by controlling the starting and stopping of the two hydraulic pumps or the unloading state of the electromagnetic overflow valve; the invention has the advantages of flexible and controllable output flow, small motor load, more energy saving, high working efficiency and small heating of hydraulic oil.
Description
Technical Field
The invention belongs to the technical field of ceramic plunger pumps, and relates to a multistage flow plunger pump hydraulic control system and a control method.
Background
The ceramic plunger pump is a common fluid delivery pump, is used for delivering other solid-containing fluids such as slurry, ore pulp and the like at high pressure and in a long distance, and is widely applied to occasions with high pressure and flow needing to be adjusted, such as pressure-changing slurry supply of a filter press.
The ceramic plunger pump drives the plunger cylinder to move up and down through the hydraulic cylinder to pump materials, the ceramic plunger pump in the prior art supplies oil to the hydraulic cylinder through one hydraulic pump, no overflow large-flow oil supply exists at low pressure, and overflow small-flow oil supply begins along with the rise of pressure; in the prior art, the flow of a plunger pump is uncontrollable, the load of a motor is large, the working efficiency is low, and the temperature of hydraulic oil is fast.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a multi-flow plunger pump hydraulic control system and a control method.
Multistage flow plunger pump hydraulic system includes: the hydraulic control system comprises two hydraulic pumps, a first check valve, a second check valve, a first electromagnetic overflow valve, a second electromagnetic overflow valve, an electromagnetic directional valve, a pressure sensor, a first proximity switch and a second proximity switch, wherein the two hydraulic pumps are the first hydraulic pump and the second hydraulic pump, and the displacement of the first hydraulic pump is smaller than that of the second hydraulic pump;
the first electromagnetic overflow valve is arranged at an oil outlet of the first hydraulic pump, and the second electromagnetic overflow valve is arranged at an oil outlet of the second hydraulic pump; the first one-way valve is arranged at an oil outlet of the first hydraulic pump, the second one-way valve is arranged at an oil outlet of the second hydraulic pump, an oil inlet of the one-way valve is connected with the hydraulic pump, and an oil outlet of the one-way valve is connected with an oil inlet of the electromagnetic reversing valve;
an oil outlet of the one-way valve is provided with a pressure sensor; two oil outlets of the electromagnetic directional valve are respectively connected with the rear cavities of the two hydraulic cylinders; the two proximity switches are arranged on the motion track of a piston rod of one hydraulic cylinder, the first proximity switch is arranged at the position of a contraction state of the piston rod, and the second proximity switch is arranged at the position of an extension state of the piston rod.
Preferably, the hydraulic control system is provided with a temperature control switch, has an overtemperature alarm function and prevents the oil temperature of the hydraulic system from being too high.
Preferably, an oil outlet of the one-way valve is provided with an energy accumulator to play a role in reducing impact.
Preferably, oil return holes of the first electromagnetic overflow valve, the second electromagnetic overflow valve and the electromagnetic directional valve are gathered and connected with a cooler.
Preferably, the neutral position function of the electromagnetic directional valve is an H-type.
According to another technical scheme of the disclosure, the hydraulic pump is a coaxial duplex pump, the coaxial duplex pump is a small pump with different discharge capacities, the small pump is a first hydraulic pump, and the large pump is a second hydraulic pump.
The control steps of the multistage flow plunger pump hydraulic control system are as follows:
step 1: starting, starting driving motors of the first hydraulic pump and the second hydraulic pump, and unloading the first electromagnetic overflow valve and the second electromagnetic overflow valve for 3-5 seconds;
and 2, step: in the large-flow stage, the first hydraulic pump and the second hydraulic pump simultaneously operate to drive the two hydraulic cylinders to reciprocate up and down, the electromagnetic directional valve switches an oil way when the piston rod of the hydraulic cylinder senses the second proximity switch downwards, the piston rod of the hydraulic cylinder starts to ascend, and the electromagnetic directional valve switches the oil way when the piston rod senses the first proximity switch upwards, the piston rod of the hydraulic cylinder starts to descend, and the operation is repeated; the first electromagnetic overflow valve and the second electromagnetic overflow valve are unloaded for 0.1-0.3 second during reversing;
and 3, step 3: in the medium-flow stage, when the pressure rises to reach a low-pressure set value of the pressure sensor, the motor of the first hydraulic pump stops, the second hydraulic pump independently drives the hydraulic cylinder to reciprocate up and down, and the second electromagnetic overflow valve unloads for 0.1-0.3 second during reversing;
and 4, step 4: in the stage of small flow, when the pressure rises to reach a high-pressure set value of the pressure sensor, the motor of the second hydraulic pump is stopped, the first hydraulic pump independently drives the hydraulic cylinder to reciprocate up and down, and the first electromagnetic overflow valve unloads for 0.1-0.3 second during reversing;
and 5: and stopping, driving a motor to stop by a hydraulic pump, and unloading the first electromagnetic overflow valve and the second electromagnetic overflow valve for 3-5 seconds.
The control steps of another technical scheme are as follows:
step 1: starting, starting driving motors of the first hydraulic pump and the second hydraulic pump, and unloading the first electromagnetic overflow valve and the second electromagnetic overflow valve for 3-5 seconds;
step 2: in the large-flow stage, the first hydraulic pump and the second hydraulic pump simultaneously operate to drive the two hydraulic cylinders to reciprocate up and down, the electromagnetic directional valve switches an oil way when the piston rod of the hydraulic cylinder senses the second proximity switch downwards, the piston rod of the hydraulic cylinder starts to ascend, and the electromagnetic directional valve switches the oil way when the piston rod senses the first proximity switch upwards, the piston rod of the hydraulic cylinder starts to descend, and the operation is repeated; the first electromagnetic overflow valve and the second electromagnetic overflow valve are unloaded for 0.1-0.3 second during reversing;
and 3, step 3: in the medium-flow stage, when the pressure rises to reach a low-pressure set value of the pressure sensor, the first electromagnetic overflow valve starts unloading to enable the first hydraulic pump to overflow in a no-load mode, the second hydraulic pump independently drives the hydraulic cylinder to reciprocate up and down, and the second electromagnetic overflow valve unloads for 0.1-0.3 second during reversing;
and 4, step 4: in the stage of small flow, when the pressure rises to reach a high-pressure set value of the pressure sensor, the second electromagnetic overflow valve starts unloading to enable the second hydraulic pump to overflow in a no-load way, the first hydraulic pump independently drives the hydraulic cylinder to reciprocate up and down, and the first electromagnetic overflow valve unloads for 0.1-0.3 second during reversing;
and 5: and stopping, driving a motor to stop by a hydraulic pump, and unloading the first electromagnetic overflow valve and the second electromagnetic overflow valve for 3-5 seconds.
The control method of the multi-flow plunger pump hydraulic control system can directly control the starting and stopping of the driving motors of the first hydraulic pump and the second hydraulic pump to obtain different flows.
The control method of the multistage flow plunger pump hydraulic control system can directly control the first electromagnetic overflow valve and the second electromagnetic overflow valve to unload, so that the corresponding hydraulic pumps overflow without load to obtain different flow rates.
The multi-stage flow plunger pump hydraulic control system and the control method have the advantages of flexible and controllable output flow, small motor load, more energy conservation, high working efficiency and small heating of hydraulic oil.
Drawings
Fig. 1 is a schematic view of a hydraulic system of a multi-stage flow plunger pump according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a second embodiment of the invention.
In the figure: 11. a first hydraulic pump; 12. a second hydraulic pump; 21. a first electromagnetic spill valve; 22. a second electromagnetic spill valve; 31. a first check valve; 32. a second one-way valve; 4. an electromagnetic directional valve; 5. a hydraulic cylinder; 61. a first proximity switch; 62. a second proximity switch; 7. a pressure sensor; 8. an accumulator; 9. a cooler; 10. a temperature control switch.
Detailed Description
The technical solution in the embodiment of the present invention is described below with reference to the drawings in the embodiment of the present invention.
Example one
As shown in fig. 1, there are two hydraulic pumps, namely a first hydraulic pump 11 and a second hydraulic pump 12, and the displacement of the first hydraulic pump 11 is smaller than that of the second hydraulic pump 12; the first electromagnetic overflow valve 21 is arranged at an oil outlet of the first hydraulic pump 11, and the second electromagnetic overflow valve 22 is arranged at an oil outlet of the second hydraulic pump 12; the first check valve 31 is arranged at an oil outlet of the first hydraulic pump 11, the second check valve 32 is arranged at an oil outlet of the second hydraulic pump 12, an oil inlet of the check valve is connected with the hydraulic pump, and an oil outlet of the check valve is connected with an oil inlet of the electromagnetic directional valve 4; an oil outlet of the one-way valve is provided with a pressure sensor 7; two oil outlets of the electromagnetic directional valve 4 are respectively connected with the rear cavities of the two hydraulic cylinders 5; the two proximity switches are arranged on the motion track of the piston rod of one of the hydraulic cylinders 5, the first proximity switch 61 is arranged at the position of the contraction state of the piston rod, and the second proximity switch 62 is arranged at the position of the extension state of the piston rod.
The hydraulic control system is provided with a temperature control switch 10, has an overtemperature alarm function and prevents the oil temperature of the hydraulic system from being too high; an oil outlet of the one-way valve is provided with an energy accumulator 8, so that the effect of reducing impact is achieved; the first electromagnetic overflow valve 21, the second electromagnetic overflow valve 22 and the oil return holes of the electromagnetic directional valve 4 are gathered and connected with the cooler 9; the neutral position function of the electromagnetic directional valve 4 is H-shaped.
The invention discloses a control method of a multistage flow plunger pump hydraulic control system, which comprises the following control steps:
step 1: starting, starting the driving motors of the first hydraulic pump 11 and the second hydraulic pump 12, unloading the first electromagnetic overflow valve 21 and the second electromagnetic overflow valve 22, and delaying for 3-5 seconds;
and 2, step: in the large-flow stage, the first hydraulic pump 11 and the second hydraulic pump 12 simultaneously operate to drive the two hydraulic cylinders 5 to reciprocate up and down, when the piston rods of the hydraulic cylinders 5 downwards sense the second proximity switch 62, the electromagnetic directional valves 4 switch oil passages, the piston rods of the hydraulic cylinders 5 start to upwards move, when the piston rods upwards sense the first proximity switch 61, the electromagnetic directional valves 4 switch oil passages, the piston rods of the hydraulic cylinders 5 start to downwards move, and the like; the first electromagnetic overflow valve 21 and the second electromagnetic overflow valve 22 are unloaded for 0.1-0.3 second during reversing;
and 3, step 3: in the medium-flow stage, when the pressure rises to reach a low-pressure set value of the pressure sensor 7, the motor of the first hydraulic pump 11 is stopped, the second hydraulic pump 12 independently drives the hydraulic cylinder 5 to reciprocate up and down, and the second electromagnetic overflow valve 22 is unloaded for 0.1-0.3 second during reversing;
and 4, step 4: in the stage of small flow, when the pressure rises to reach a high-pressure set value of the pressure sensor 7, the motor of the second hydraulic pump 12 is stopped, the first hydraulic pump 11 independently drives the hydraulic cylinder 5 to reciprocate up and down, and the first electromagnetic overflow valve 21 is unloaded for 0.1-0.3 second during reversing;
and 5: and (4) stopping, stopping the hydraulic pump driving motor, unloading the first electromagnetic overflow valve 21 and the second electromagnetic overflow valve 22, and delaying for 3-5 seconds.
Example two
As shown in fig. 2, the hydraulic pump is a coaxial duplex pump, the coaxial duplex pump is a small pump with different displacement, the small pump is a first hydraulic pump 11, and the large pump is a second hydraulic pump 12.
The invention discloses a control method of a multistage flow plunger pump hydraulic control system, which comprises the following control steps:
step 1: starting, starting the driving motors of the first hydraulic pump 11 and the second hydraulic pump 12, unloading the first electromagnetic overflow valve 21 and the second electromagnetic overflow valve 22, and delaying for 3-5 seconds;
step 2: in the large-flow stage, the first hydraulic pump 11 and the second hydraulic pump 12 simultaneously operate to drive the two hydraulic cylinders 5 to reciprocate up and down, when the piston rods of the hydraulic cylinders 5 downwards sense the second proximity switch 62, the electromagnetic directional valves 4 switch oil passages, the piston rods of the hydraulic cylinders 5 start to upwards move, when the piston rods upwards sense the first proximity switch 61, the electromagnetic directional valves 4 switch oil passages, the piston rods of the hydraulic cylinders 5 start to downwards move, and the like; the first electromagnetic overflow valve 21 and the second electromagnetic overflow valve 22 are unloaded for 0.1-0.3 second during reversing;
and step 3: in the medium flow stage, when the pressure rises to reach a low-pressure set value of the pressure sensor 7, the first electromagnetic overflow valve 21 starts unloading to enable the first hydraulic pump 11 to overflow in a no-load mode, the second hydraulic pump 12 independently drives the hydraulic cylinder 5 to reciprocate up and down, and the second electromagnetic overflow valve 22 unloads for 0.1-0.3 seconds in the reversing process;
and 4, step 4: in the stage of small flow, when the pressure rises to reach a high-pressure set value of the pressure sensor 7, the second electromagnetic overflow valve 22 starts unloading to enable the second hydraulic pump 12 to overflow in a no-load way, the first hydraulic pump 11 independently drives the hydraulic cylinder 5 to reciprocate up and down, and the first electromagnetic overflow valve 21 unloads for 0.1-0.3 seconds during reversing;
and 5: and stopping the machine, stopping the hydraulic pump driving motor, unloading the first electromagnetic overflow valve 21 and the second electromagnetic overflow valve 22, and delaying for 3-5 seconds.
The control method of the multi-flow plunger pump hydraulic system can directly control the start and stop of the driving motors of the first hydraulic pump 11 and the second hydraulic pump 12 to obtain different flows.
The control method of the multi-level flow plunger pump hydraulic control system can directly control the first electromagnetic overflow valve 21 and the second electromagnetic overflow valve 22 to unload, so that the corresponding hydraulic pumps overflow in a no-load mode to obtain different flows.
Claims (10)
1. Multistage flow plunger pump hydraulic system, its characterized in that includes: the hydraulic control system comprises two hydraulic pumps, a first check valve, a second check valve, a first electromagnetic overflow valve, a second electromagnetic overflow valve, an electromagnetic directional valve, a pressure sensor, a first proximity switch and a second proximity switch, wherein the two hydraulic pumps are the first hydraulic pump and the second hydraulic pump, and the displacement of the first hydraulic pump is smaller than that of the second hydraulic pump;
the first electromagnetic overflow valve is arranged at an oil outlet of the first hydraulic pump, and the second electromagnetic overflow valve is arranged at an oil outlet of the second hydraulic pump;
the first one-way valve is arranged at an oil outlet of the first hydraulic pump, the second one-way valve is arranged at an oil outlet of the second hydraulic pump, an oil inlet of the one-way valve is connected with the hydraulic pump, and an oil outlet of the one-way valve is connected with an oil inlet of the electromagnetic reversing valve;
an oil outlet of the one-way valve is provided with a pressure sensor;
two oil outlets of the electromagnetic directional valve are respectively connected with the rear cavities of the two hydraulic cylinders;
the two proximity switches are arranged on the motion track of a piston rod of one hydraulic cylinder, the first proximity switch is arranged at the position of a contraction state of the piston rod, and the second proximity switch is arranged at the position of an extension state of the piston rod.
2. The multi-rate plunger pump hydraulic system of claim 1, wherein the hydraulic pump is a co-axial tandem pump, the co-axial tandem pump is a size pump with different displacement, the small pump is a first hydraulic pump, and the large pump is a second hydraulic pump.
3. The multi-stage flow plunger pump hydraulic control system according to claim 1, wherein the hydraulic control system is provided with a temperature control switch, and has an overtemperature alarm function to prevent the oil temperature of the hydraulic system from being too high.
4. The multi-stage flow plunger pump hydraulic system as claimed in claim 1, wherein an accumulator is provided at an oil outlet of the check valve.
5. The multi-stage flow plunger pump hydraulic system according to claim 1, wherein the first electromagnetic overflow valve, the second electromagnetic overflow valve and the oil return holes of the electromagnetic directional valve are collected and connected with a cooler.
6. The multi-stage flow plunger pump hydraulic system of claim 1, wherein the median function of the electromagnetic directional valve is H-shaped.
7. The control method of the multistage flow plunger pump hydraulic system according to claim 1, characterized by comprising the following steps:
step 1: starting the driving motors of the first hydraulic pump and the second hydraulic pump, and unloading and delaying the first electromagnetic overflow valve and the second electromagnetic overflow valve for 3-5 seconds;
step 2: in the large-flow stage, the first hydraulic pump and the second hydraulic pump simultaneously operate to drive the two hydraulic cylinders to reciprocate up and down, the electromagnetic directional valve switches the oil way when the piston rod of the hydraulic cylinder senses the second proximity switch in a descending manner, the piston rod of the hydraulic cylinder starts to ascend, and the electromagnetic directional valve switches the oil way when the piston rod senses the first proximity switch in an ascending manner, so that the piston rod of the hydraulic cylinder starts to descend, and the reciprocating is performed; the first electromagnetic overflow valve and the second electromagnetic overflow valve are unloaded for 0.1-0.3 seconds during reversing;
and 3, step 3: in the medium-flow stage, when the pressure rises to reach a low-pressure set value of the pressure sensor, the motor of the first hydraulic pump stops, the second hydraulic pump independently drives the hydraulic cylinder to reciprocate up and down, and the second electromagnetic overflow valve unloads for 0.1-0.3 second during reversing;
and 4, step 4: in the stage of small flow, when the pressure rises to reach a high-pressure set value of the pressure sensor, the motor of the second hydraulic pump is stopped, the first hydraulic pump independently drives the hydraulic cylinder to reciprocate up and down, and the first electromagnetic overflow valve unloads for 0.1-0.3 second during reversing;
and 5: and stopping, driving a motor to stop by a hydraulic pump, and unloading the first electromagnetic overflow valve and the second electromagnetic overflow valve for 3-5 seconds.
8. The control method of the multistage flow plunger pump hydraulic system according to claims 1 to 2, characterized by comprising the following steps:
step 1: starting, starting driving motors of the first hydraulic pump and the second hydraulic pump, and unloading the first electromagnetic overflow valve and the second electromagnetic overflow valve for 3-5 seconds;
step 2: in the large-flow stage, the first hydraulic pump and the second hydraulic pump simultaneously operate to drive the two hydraulic cylinders to reciprocate up and down, the electromagnetic directional valve switches an oil way when the piston rod of the hydraulic cylinder senses the second proximity switch downwards, the piston rod of the hydraulic cylinder starts to ascend, and the electromagnetic directional valve switches the oil way when the piston rod senses the first proximity switch upwards, the piston rod of the hydraulic cylinder starts to descend, and the operation is repeated; the first electromagnetic overflow valve and the second electromagnetic overflow valve are unloaded for 0.1-0.3 second during reversing;
and 3, step 3: in the medium-flow stage, when the pressure rises to reach a low-pressure set value of the pressure sensor, the first electromagnetic overflow valve starts unloading to enable the first hydraulic pump to overflow in a no-load mode, the second hydraulic pump independently drives the hydraulic cylinder to reciprocate up and down, and the second electromagnetic overflow valve unloads for 0.1-0.3 second during reversing;
and 4, step 4: in the stage of small flow, when the pressure rises to reach a high-pressure set value of the pressure sensor, the second electromagnetic overflow valve starts unloading to enable the second hydraulic pump to overflow in a no-load way, the first hydraulic pump independently drives the hydraulic cylinder to reciprocate up and down, and the first electromagnetic overflow valve unloads for 0.1-0.3 second during reversing;
and 5: and (4) stopping, driving a motor to stop by the hydraulic pump, and unloading the first electromagnetic overflow valve and the second electromagnetic overflow valve for 3-5 seconds.
9. The method for controlling the hydraulic system of the multi-stage flow plunger pump according to claim 1, wherein the method can directly control the start and stop of the driving motors of the first hydraulic pump and the second hydraulic pump to obtain different flow rates.
10. The control method of the multistage flow plunger pump hydraulic system according to claims 1 to 2, characterized in that the unloading of the first electromagnetic overflow valve and the second electromagnetic overflow valve can be directly controlled, so that the unloaded overflow of the corresponding hydraulic pumps can obtain different flow rates.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211088679.5A CN115289083A (en) | 2022-09-07 | 2022-09-07 | Multistage flow plunger pump hydraulic control system and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211088679.5A CN115289083A (en) | 2022-09-07 | 2022-09-07 | Multistage flow plunger pump hydraulic control system and control method |
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| CN115289083A true CN115289083A (en) | 2022-11-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115783798A (en) * | 2022-11-24 | 2023-03-14 | 景津装备股份有限公司 | Discharging sliding frame hydraulic control system of storage bin and control method thereof |
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2022
- 2022-09-07 CN CN202211088679.5A patent/CN115289083A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115783798A (en) * | 2022-11-24 | 2023-03-14 | 景津装备股份有限公司 | Discharging sliding frame hydraulic control system of storage bin and control method thereof |
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