CN203272037U - Electronic control proportional variable axial plunger pump - Google Patents
Electronic control proportional variable axial plunger pump Download PDFInfo
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- CN203272037U CN203272037U CN 201320304327 CN201320304327U CN203272037U CN 203272037 U CN203272037 U CN 203272037U CN 201320304327 CN201320304327 CN 201320304327 CN 201320304327 U CN201320304327 U CN 201320304327U CN 203272037 U CN203272037 U CN 203272037U
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Abstract
The utility model discloses an electronic control proportional variable axial plunger pump. The electronic control proportional variable axial plunger pump comprises a plunger pump main body and a variable mechanism, wherein the variable mechanism is arranged on one side of the plunger pump main body. The plunger pump main body comprises a pump body and a variable disc, wherein the variable disc is arranged in the pump body. The variable mechanism comprises a variable piston, a first oil chamber and a second oil chamber, wherein the variable piston is connected with the variable disc, and the first oil chamber and the second oil chamber are formed in the two ends of the variable piston. A hydraulic control system is further arranged on the outer side of the pump body and comprises a controller, a proportional direction valve, a transition plate and a detection mechanism. The proportional direction valve is connected with the controller and used for controlling oil flow, the detection mechanism is used for monitoring the position of the variable piston, the transition plate is installed on the outer side of the pump body and provided with two oil outlets, the two oil outlets are communicated with the first oil chamber and the second oil chamber respectively, the proportional direction valve is installed on the transition plate, and the detection mechanism is connected with the controller. The electronic control proportional variable axial plunger pump has the advantages of being easy to control and high in reliability and repeated accuracy, and discharge capacity can be adjusted in real time in the working process.
Description
Technical field
The utility model relates to a kind of axial piston pump, especially relates to a kind of automatically controlled rate variable axial piston pump.
Background technique
The requirements at the higher level that transmission and control characteristic proposed in order to adapt to engineering system, electro-hydraulic proportional control technology become since the seventies progressively develops last century six Fluid Transmission and Control field the branch of the vigorous vitality of tool.At present, adopt the electric-hydraulic proportion hydraulics to design modern hydraulic equipment, become indispensable important means, obtain related industries circle, the especially attention of technos.Oil hydraulic pump is that the dynamical element of certain flow and pressure medium is provided for hydraulic system, and it is the heart of whole hydraulic system.Its performance directly affects the performance of whole hydraulic system.Automatically controlled ratio axial piston pump is easy because controlling, and is active in one's movements, and repeatability is high, can realize stepless variable, and rated working pressure advantages of higher, application are the most extensive.But some automatically controlled ratio axial piston pump used is handled the stroking mechanism of plunger pump by the driven by servomotor ball screw at present, need the configuration codes device to drive actuating motor work, the manufacture cost that it is expensive and maintenance cost, relatively large occupation of land space, complicated control mechanism restricts it and popularizes on a large scale; And some automatically controlled ratio axial piston pump passing ratio electromagnet, pilot valve is regulated, although structure is simple, it is limited by self-characteristic, and it is unreliable for repeatability, is difficult to satisfy actual operation requirements.
application number is to disclose a kind of unidirectional hydraulic axial variable displacement plunger pump in the Chinese utility model patent of 200810063066.x, this unidirectional hydraulic axial variable displacement plunger pump comprises the plunger pump main body and is located at the stroking mechanism of plunger pump main body one side, stroking mechanism comprises the first flange on the first flange mounting end face of the pump housing of being located at the plunger pump main body, the second flange of being located at the pump housing of plunger pump main body is installed the second flange on end face, the variable piston, Returnning spring, transition plate and solenoid directional control valve, the two ends of variable piston respectively with the first flange be connected flange seal and be connected and form respectively the first oil pocket and the second oil pocket, the bottom of variable piston is connected with the variable dish, transition plate is located at the outside of the pump housing and is had two oil outlets, two oil outlets of transition plate communicate with the first oil pocket and the second oil pocket respectively, solenoid directional control valve is arranged on transition plate, be used for controlling the flow direction of oil.When solenoid directional control valve is selected on transition plate with the first oil pocket communicates oil outlet oil-feed, the output discharge capacity of plunger pump is determined by the space size of the first oil pocket, when solenoid directional control valve is selected on transition plate with the second oil pocket communicates oil outlet oil-feed, the output discharge capacity of plunger pump is determined by the space size of the second oil pocket.In the plunger pump working procedure, solenoid directional control valve is according to the oil outlet oil-feed on the output discharge capacity selection transition plate of default plunger pump, until the plunger pump end-of-job.Cause thus this unidirectional hydraulic axial variable displacement plunger pump can not change in the course of the work its output discharge capacity.
The model utility content
Technical problem to be solved in the utility model is to provide a kind ofly can be adjusted the space size of the first oil pocket and the second oil pocket according to plunger pump delivery demand in the plunger pump working procedure, and select afterwards the automatically controlled rate variable axial piston pump of corresponding oil outlet input control oil in the space size adjustment of the first oil pocket and the second oil pocket, automatically controlled rate variable axial piston pump of the present utility model has been realized the adjusting of output discharge capacity in the plunger pump working procedure, and control simple, reliability is high, and repeatability is high.
the utility model solves the problems of the technologies described above the technological scheme that adopts: a kind of automatically controlled rate variable axial piston pump, comprise the plunger pump main body and be arranged at the stroking mechanism of described plunger pump main body one side, described plunger pump main body comprises the pump housing and is arranged at the interior variable dish of the described pump housing, described stroking mechanism comprises the variable piston that is connected with described variable dish and the first oil pocket and the second oil pocket that form at described variable piston two ends, the described pump housing outside also is provided with hydraulic control system, described hydraulic control system comprises controller, be connected and be used for controlling the proportional direction valve of the flow of oil with described controller, transition plate and be used for monitoring the feeler mechanism of described variable piston position, described transition plate is arranged on outside the described pump housing, described transition plate has two oil outlets, two oil outlets are communicated with the first oil pocket and the second oil pocket respectively, described proportional direction valve is arranged on described transition plate, described feeler mechanism is connected with described controller, the position of the described variable piston of described feeler mechanism Real-Time Monitoring also feeds back to described controller with this position information, described controller requires to drive the corresponding oil outlet of described proportional direction valve selection according to position and the discharge capacity of described variable piston.
described stroking mechanism also comprises the first flange and the second flange, described the first flange and described the second flange are arranged on respectively the outside of the described pump housing, one end of described variable piston and described the first flange are tightly connected and form described the first oil pocket between the two, the other end of described variable piston is connected with described the second flange seal and forms described the second oil pocket between the two, described feeler mechanism comprises linear displacement transducer and magnet ring, be provided with magnetic ring mounting base in described variable piston, described linear displacement transducer comprises sensor main body and test rod, described test rod extends in described magnetic ring mounting base after stretching into described the second oil pocket, described magnet ring is arranged in described magnetic ring mounting base and is enclosed within on described test rod, described controller be connected linear displacement transducer and connect.Be provided with the dividing plate that non-magnet material is made between described magnet ring and described magnetic ring mounting base, described dividing plate is fixed on described magnetic ring mounting base.
Be equipped with Adjusting bolt Adjusting screw on described the first end face of flange, the inner end of described Adjusting bolt Adjusting screw reaches in described the first oil pocket, the outer end of described Adjusting bolt Adjusting screw is provided with locking nut and top cover nut, the arranged outside of described variable piston has step surface, the described variable piston outside is arranged with spacing back-up ring, described spacing back-up ring is between the step surface and described the second flange in the described variable piston outside, and described spacing back-up ring is arranged on described the second flange.
be equipped with successively the first screw and push rod in described Adjusting bolt Adjusting screw, the outer end of described push rod is withstood in the inner end of described the first screw, the inner end of described push rod reaches in described variable piston, be provided with spring in described variable piston, described spring housing is located on the inner end and described magnetic ring mounting base of described push rod, the outside of the inner end of described push rod and the outside of described magnetic ring mounting base have respectively a step surface, one end of described spring withstands on the step surface in the outside of inner end of described push rod, the other end of described spring withstands on the step surface in the described magnetic ring mounting base outside.
described plunger pump main body also comprises and is assemblied on the described pump housing and forms the pump cover of a confined space with the described pump housing, be arranged at the slide plate on described variable dish, be arranged at the return plate on described slide plate, be installed on transmission shaft in the described pump housing by the bearing rotary dynamic formula, in the described pump housing and the cylinder body that is connected with described transmission shaft and be arranged at described cylinder body and described return plate between plunger piston slippery boots assembly, described cylinder body can rotate with described transmission shaft, described cylinder body has a neck near an end of described return plate, be provided with ball-joint on described neck, the outer side surface of described ball-joint and described return plate drive fit, be provided with belleville spring between the inner side surface of described ball-joint and described neck.
compared with prior art, the utility model has the advantage of that hydraulic control system comprises controller, be connected and be used for controlling the proportional direction valve of the flow of oil with controller, transition plate and be used for the feeler mechanism of monitored parameters piston position, transition plate is arranged on outside the pump housing, transition plate has two oil outlets, two oil outlets are communicated with the first oil pocket and the second oil pocket respectively, proportional direction valve is arranged on described transition plate, feeler mechanism is connected with controller, the passing ratio directional control valve is controlled flow and the pressure of the first oil pocket and the second oil pocket inner fluid, promote the left and right action of performance variable piston, the position of feeler mechanism's Real-Time Monitoring variable piston also feeds back to controller with this position information, controller coordinates the variable piston that the position of variable piston is controlled in closed-loop system, controller will be made comparisons corresponding to the input signal of variable piston expection final position and the feedback signal that feeler mechanism sends here, thereby generation error signal, after the error signal via controller is processed and is amplified, output to the oil outlet that proportional direction valve drive ratio proportional direction valve Action Selection adapts to, promote the variable piston action, thereby change feedback signal value, adjusting action continues to carry out, until feedback signal and input signal are in full accord, thereby the output discharge capacity demand according to plunger pump in the plunger pump working procedure is adjusted the space size of the first oil pocket and the second oil pocket, and select corresponding oil outlet input control oily after the space size adjustment of the first oil pocket and the second oil pocket, realize the adjusting of the output discharge capacity of plunger pump in working procedure, and possesses good reliability, high repeatability precision, reduce stagnant ring phenomenon to the impact of host performance, control simple, reliability is high, repeatability is high,
When feeler mechanism comprises linear displacement transducer and magnet ring, middle without any conversion process by the physical location of linear displacement transducer direct-detection variable piston, further improved the positional accuracy of variable piston and controlled and dynamic response characteristic;
When being provided with the dividing plate that non-magnet material makes between magnet ring and magnetic ring mounting base, the magnetic property that can avoid preventing magnet ring is affected, and guarantees the testing precision of linear displacement transducer;
When limit minimum and the maximum pump discharge of plunger pump by Adjusting bolt Adjusting screw and spacing back-up ring, namely can be according to the negative pivot angle maximum pump discharge of main process equipment actual demand restriction plunger pump and positive pivot angle maximum pump discharge, can guarantee plunger pump under the automatical control system failure conditions, not destroy plunger pump operation parts because pivot angle surpasses design angle;
be equipped with successively the first screw and push rod in Adjusting bolt Adjusting screw, be provided with spring in the variable piston, spring housing is located on the inner end and magnetic ring mounting base of push rod, one end of spring withstands on the step surface of variable piston inboard, when the other end of spring withstands on the step surface in the magnetic ring mounting base outside, when the variable piston is stressed, spring produces corresponding cushion effect, the pressure that is subject at the variable piston is during greater than cushion effect, the variable piston moves, prevent that the variable piston is subject to moment impulse force fast moving, guarantee stability and reliability that the variable piston moves, avoid the variable dish pendulum angle too fast plunger pump filler opening fluid that causes of moment to inhale sky, reduce simultaneously the wearing and tearing of variable piston,
When cylinder body has a neck near an end of return plate, be provided with ball-joint on neck, the outer side surface of ball-joint and return plate drive fit, when being provided with belleville spring between the inner side surface of ball-joint and neck, provide return plate to act on the initial pretightening force of plunger piston slippery boots assembly by belleville spring and ball-joint, increase area of contact, improved the ability of plunger piston slippery boots assembly anti-bias load.
Description of drawings
Fig. 1 is sectional view of the present utility model;
Fig. 2 is the sectional view of stroking mechanism of the present utility model;
Fig. 3 is electric hookup of the present utility model.
Embodiment
Embodiment is described in further detail the utility model below in conjunction with accompanying drawing.
embodiment: as shown in the figure, a kind of automatically controlled rate variable axial piston pump, comprise the plunger pump main body and be arranged at the stroking mechanism of plunger pump main body one side, the plunger pump main body comprises the pump housing 1 and is arranged at the interior variable dish 2 of the pump housing 1, stroking mechanism comprises the variable piston 3 that is connected with variable dish 2 and the first oil pocket 31 and the second oil pocket 32 that form at variable piston 3 two ends, variable piston 3 acts on variable dish 2 by variable slide block 33, the pump housing 1 outside also is provided with hydraulic control system, hydraulic control system comprises controller 4, be connected and be used for controlling the proportional direction valve 5 of the flow of oil with controller 4, transition plate 6 and be used for the feeler mechanism of monitored parameters piston 3 positions, transition plate 6 is arranged on the pump housing 1 outside, transition plate 6 has two oil outlets, two oil outlets are communicated with the first oil pocket 31 and the second oil pocket 32 respectively, proportional direction valve 5 is arranged on transition plate 6, feeler mechanism is connected with controller 4, the position of feeler mechanism's Real-Time Monitoring variable piston 3 also feeds back to controller 4 with this position information, controller 4 requires drive ratio proportional direction valve 5 to select corresponding oil outlet according to position and the discharge capacity of variable piston 3.
in the present embodiment, stroking mechanism also comprises the first flange 7 and the second flange 8, the first flange 7 and the second flange 8 are arranged on respectively the outside of the pump housing 1, one end of variable piston 3 and the first flange 7 are tightly connected and form the first oil pocket 31 between the two, the other end of variable piston 3 and the second flange 8 are tightly connected and form the second oil pocket 32 between the two, feeler mechanism comprises linear displacement transducer 9 and magnet ring 10, be provided with magnetic ring mounting base 11 in variable piston 3, linear displacement transducer 9 comprises sensor main body 91 and test rod 92, test rod 92 extends in magnetic ring mounting base 11 after stretching into the second oil pocket 32, magnet ring 10 is arranged in magnetic ring mounting base 11 and is enclosed within on test rod 92, controller 4 is connected connection with linear displacement transducer.
In the present embodiment, be provided with the dividing plate 12 that non-magnet material is made between magnet ring 10 and magnetic ring mounting base 11, dividing plate 12 is fixed on magnetic ring mounting base 11.
in the present embodiment, be equipped with Adjusting bolt Adjusting screw 13 on the first flange 7 end faces, the inner end of Adjusting bolt Adjusting screw 13 reaches in the first oil pocket 31, be provided with locking nut 16 and top cover nut 17 on the outer end of Adjusting bolt Adjusting screw 13, be equipped with successively the first screw 14 and push rod 15 in Adjusting bolt Adjusting screw 13, the outer end of push rod 15 is withstood in the inner end of the first screw 14, and the inner end of push rod 15 reaches in variable piston 3, be provided with spring 18 in variable piston 3, spring 18 is set on the inner end and magnetic ring mounting base 11 of push rod 15, the outside of the inboard in the outside of the inner end of push rod 15 and magnetic ring mounting base 11 has respectively a step surface, one end of spring 18 withstands on the step surface in the outside of inner end of push rod 15, the other end of spring 18 withstands on the step surface in magnetic ring mounting base 11 outsides, the arranged outside of variable piston 3 has step surface, variable piston 3 outsides are arranged with spacing back-up ring 19, spacing back-up ring 19 is between the step surface and the second flange 8 in variable piston 3 outsides, spacing back-up ring 19 is fixedly mounted on the second flange 8 by socket head screw.
in the present embodiment, the plunger pump main body also comprises and is assemblied on the pump housing 1 and forms the pump cover 20 of a confined space with the pump housing 1, be arranged at the slide plate 21 on variable dish 2, be arranged at the return plate 22 on slide plate 21, be installed on the interior transmission shaft 23 of the pump housing 1 by the bearing rotary dynamic formula, in the pump housing 1 and the cylinder body 24 that is connected with transmission shaft 23 and be arranged at cylinder body 24 and return plate 22 between plunger piston slippery boots assembly 25, cylinder body 24 can rotate with transmission shaft 23, cylinder body 24 has a neck 241 near an end of return plate 22, be provided with ball-joint 26 on neck 241, the outer side surface of ball-joint 26 and return plate 22 drive fits, be provided with belleville spring 27 between the inner side surface of ball-joint 25 and neck 241, variable dish 2 is an angle of inclination with transmission shaft 23.Pump cover 20 is connected by socket head screw with the pump housing 1, transmission shaft 23 is assemblied in the pump housing 1 by full rail cylindrical roller bearing (inner ring is arranged) 28 and full rail cylindrical roller bearing (without inner ring) 29, end cover 34 is arranged at will expire rail cylindrical roller bearing (inner ring is arranged) 28 and be pressed in the pump housing 1 on the pump housing 1, joining of pump cover 20 is equipped with oil distribution casing 35 on pasta.
working principle of the present utility model is: the transmission shaft 23 of axial piston pump is rotated by driven by motor, transmission shaft 23 connects with cylinder body 24 use involute spliness, transmission shaft 23 drives cylinder body 24 rotations, a plurality of plunger piston slippery boots assemblies 25 are around the center line rotation of transmission shaft 23 simultaneously, plunger piston slippery boots assembly 25 is pressed on the variable dish 2 that becomes certain angle of inclination with axis by interior belleville spring 27 compression force of ball-joint 26 in return plate 22, utilize a plurality of plunger piston slippery boots assemblies 25 the volume-variation that cylinder body 24 plunger holes in to-and-fro motion produce parallel with transmission shaft 23 to complete the do action of oil suction and force feed.The endoporus of variable piston 3 and the first flange 7 and the second right flange 8 consists of one group and carries out oil cylinder, and this execution oil cylinder comprises the first oil pocket 31 and the second oil pocket 32, and variable piston 3 changes the inclination angle by variable slide block 33 drive variable dishes 2 and realizes that pump displacement changes.Magnet ring 10 is fixed in variable piston 3 endoporus, supports the use detection variable piston 3 positions with linear displacement transducer 9, makes variable piston 3 move to desired location.Realize that by spacing ring washer 19 variable piston 3 farthest right position are spacing, realize that by Adjusting bolt Adjusting screw 13 variable piston 3 leftmost position are spacing, namely limit the plunger pump minimum, maximum pump discharge.Push rod 15 in the first screw 14 and variable piston 3 contacts, and satisfies variable piston 3 gently to the left movement purpose, and realizes that this pump reaches control cylinder zero-bit alignment function by spring 18 in non-pressurized situation.Passing ratio directional control valve 5 is controlled flow and the pressure of the first oil pocket 31 and the second oil pocket 32 inner fluids, promotes the 3 left and right actions of performance variable piston, realizes the function of Displacement Regulation.Controller 4 adopts the PID control meanss, and the PID control means coordinates 3 pairs, variable piston variable piston 3 positions to control in closed-loop system.The PID control means will be made comparisons with the feedback signal that linear displacement transducer 9 is sent here corresponding to the input signal of variable piston 3 expection final position, thus the generation error signal.Error signal is after variable piston 3 is processed and amplified, output to oil outlet action corresponding to drive ratio proportional direction valve selection in proportional direction valve 5, promote 3 actions of variable piston, thereby change feedback signal value, adjusting action continues to carry out, until feedback signal and input signal are in full accord, complete the requirement that the plunger pump discharge capacity is regulated.
Claims (6)
1. automatically controlled rate variable axial piston pump, comprise the plunger pump main body and be arranged at the stroking mechanism of described plunger pump main body one side, described plunger pump main body comprises the pump housing and is arranged at the interior variable dish of the described pump housing, described stroking mechanism comprises the variable piston that is connected with described variable dish and the first oil pocket and the second oil pocket that form at described variable piston two ends, it is characterized in that also being provided with hydraulic control system outside the described pump housing, described hydraulic control system comprises controller, be connected and be used for controlling the proportional direction valve of the flow of oil with described controller, transition plate and be used for monitoring the feeler mechanism of described variable piston position, described transition plate is arranged on outside the described pump housing, described transition plate has two oil outlets, two oil outlets are communicated with the first oil pocket and the second oil pocket respectively, described proportional direction valve is arranged on described transition plate, described feeler mechanism is connected with described controller, the position of the described variable piston of described feeler mechanism Real-Time Monitoring also feeds back to described controller with this position information, described controller requires to drive the corresponding oil outlet of described proportional direction valve selection according to position and the discharge capacity of described variable piston.
2. automatically controlled rate variable axial piston pump according to claim 1, it is characterized in that described stroking mechanism also comprises the first flange and the second flange, described the first flange and described the second flange are arranged on respectively the outside of the described pump housing, one end of described variable piston and described the first flange are tightly connected and form described the first oil pocket between the two, the other end of described variable piston is connected with described the second flange seal and forms described the second oil pocket between the two, described feeler mechanism comprises linear displacement transducer and magnet ring, be provided with magnetic ring mounting base in described variable piston, described linear displacement transducer comprises sensor main body and test rod, described test rod extends in described magnetic ring mounting base after stretching into described the second oil pocket, described magnet ring is arranged in described magnetic ring mounting base and is enclosed within on described test rod, described controller be connected linear displacement transducer and connect.
3. automatically controlled rate variable axial piston pump according to claim 2, is characterized in that being provided with the dividing plate that non-magnet material is made between described magnet ring and described magnetic ring mounting base, and described dividing plate is fixed on described magnetic ring mounting base.
4. automatically controlled rate variable axial piston pump according to claim 2, it is characterized in that being equipped with Adjusting bolt Adjusting screw on described the first end face of flange, the inner end of described Adjusting bolt Adjusting screw reaches in described the first oil pocket, the outer end of described Adjusting bolt Adjusting screw is provided with locking nut and top cover nut, the arranged outside of described variable piston has step surface, the described variable piston outside is arranged with spacing back-up ring, described spacing back-up ring is between the step surface and described the second flange in the described variable piston outside, described spacing back-up ring is arranged on described the second flange.
5. automatically controlled rate variable axial piston pump according to claim 4, it is characterized in that being equipped with successively in described Adjusting bolt Adjusting screw the first screw and push rod, the outer end of described push rod is withstood in the inner end of described the first screw, the inner end of described push rod reaches in described variable piston, be provided with spring in described variable piston, described spring housing is located on the inner end and described magnetic ring mounting base of described push rod, the outside of the inner end of described push rod and the outside of described magnetic ring mounting base have respectively a step surface, one end of described spring withstands on the step surface in the outside of inner end of described push rod, the other end of described spring withstands on the step surface in the described magnetic ring mounting base outside.
6. automatically controlled rate variable axial piston pump according to claim 1, it is characterized in that described plunger pump main body also comprises is assemblied on the described pump housing and forms the pump cover of a confined space with the described pump housing, be arranged at the slide plate on described variable dish, be arranged at the return plate on described slide plate, be installed on transmission shaft in the described pump housing by the bearing rotary dynamic formula, in the described pump housing and the cylinder body that is connected with described transmission shaft and be arranged at described cylinder body and described return plate between plunger piston slippery boots assembly, described cylinder body can rotate with described transmission shaft, described cylinder body has a neck near an end of described return plate, be provided with ball-joint on described neck, the outer side surface of described ball-joint and described return plate drive fit, be provided with belleville spring between the inner side surface of described ball-joint and described neck.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320304327 CN203272037U (en) | 2013-05-29 | 2013-05-29 | Electronic control proportional variable axial plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320304327 CN203272037U (en) | 2013-05-29 | 2013-05-29 | Electronic control proportional variable axial plunger pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203272037U true CN203272037U (en) | 2013-11-06 |
Family
ID=49502470
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320304327 Withdrawn - After Issue CN203272037U (en) | 2013-05-29 | 2013-05-29 | Electronic control proportional variable axial plunger pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203272037U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291575A (en) * | 2013-05-29 | 2013-09-11 | 宁波恒力液压股份有限公司 | Electric proportional variable axial plunger pump |
| CN114087149A (en) * | 2021-11-17 | 2022-02-25 | 重庆大学 | Double-cavity independently-controlled plunger pump variable control loop and multi-mode switching control method |
-
2013
- 2013-05-29 CN CN 201320304327 patent/CN203272037U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103291575A (en) * | 2013-05-29 | 2013-09-11 | 宁波恒力液压股份有限公司 | Electric proportional variable axial plunger pump |
| CN103291575B (en) * | 2013-05-29 | 2015-07-08 | 宁波恒力液压股份有限公司 | Electric proportional variable axial plunger pump |
| CN114087149A (en) * | 2021-11-17 | 2022-02-25 | 重庆大学 | Double-cavity independently-controlled plunger pump variable control loop and multi-mode switching control method |
| CN114087149B (en) * | 2021-11-17 | 2023-12-05 | 重庆大学 | Variable control loop of plunger pump with double-cavity independent control and multi-mode switching control method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131106 Effective date of abandoning: 20150708 |
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| RGAV | Abandon patent right to avoid regrant |