CN115585113A

CN115585113A - Electric hydraulic pump

Info

Publication number: CN115585113A
Application number: CN202211311783.6A
Authority: CN
Inventors: 李育冰; 陈瑞峰; 刘洪生; 安小旭; 胡闯; 蒙杰
Original assignee: China Railway Electrification Engineering Group Co Ltd; Third Engineering Co Ltd of China Railway Electrification Engineering Group Co Ltd
Current assignee: China Railway Electrification Engineering Group Co Ltd; Third Engineering Co Ltd of China Railway Electrification Engineering Group Co Ltd
Priority date: 2022-10-25
Filing date: 2022-10-25
Publication date: 2023-01-10

Abstract

The invention provides an electric hydraulic pump, and belongs to the technical field of hydraulic pumps. The problem that the existing hydraulic pump cannot control the speed of oil return is solved. This electronic hydraulic pump, hydraulic pump main part include ball valve subassembly, go out oil circuit, return oil circuit and connecting path one. The oil outlet path is communicated with the oil return path through a first connecting path, an oil return circular ring is arranged in the first connecting path, the ball valve assembly is positioned in the first connecting path, and the cross section of a through hole of the oil return circular ring is smaller than the maximum cross section of a ball valve I in the ball valve assembly; the electric hydraulic pump comprises a first motor, an oil return rod and a cam assembly, the cam assembly is installed on an output shaft of the first motor, one end of the oil return rod is abutted to the cam assembly, the other end of the oil return rod is located in a first connecting path and connected with a ball valve assembly, and an encoder is installed on an output shaft of the first motor. The encoder can detect the rotation angle of the motor in real time so as to accurately control the gap between the ball valve assembly and the oil return circular ring. Therefore, the oil return speed can be accurately controlled.

Description

Electric hydraulic pump

Technical Field

The invention belongs to the technical field of hydraulic pumps, and relates to an electric hydraulic pump.

Background

The electric hydraulic pump (including charging hydraulic pump and lithium electric hydraulic pump) is a hydraulic element for providing pressurized liquid for hydraulic transmission, and is mainly used as a power source for industrial industries such as automobile disassembly, material shearing, strength test and the like and civil hydraulic equipment. The electric hydraulic pump can be provided with hydraulic tools such as split scissors, split press-fit, split punching, split bending and the like. The electric hydraulic pump is typically self-contained with hydraulic oil.

The existing hydraulic pump comprises an oil bag, a plunger pump and an oil return valve, the plunger pump is used for discharging oil from the oil bag, the oil return valve is used for returning hydraulic oil to the oil bag, and the oil return valve is connected with an electromagnetic valve through a connecting rod. The electromagnetic valve drives the oil return valve to move through the connecting rod so as to open the oil return passage, but the opening mode just like a switch is only simple opening and closing, and an operator cannot control the oil return speed, so that the operation is inconvenient.

Disclosure of Invention

The invention aims to solve the technical problems and provides an electric hydraulic pump which solves the problem that the conventional hydraulic pump cannot control the speed of return oil.

The purpose of the invention can be realized by the following technical scheme:

the electric hydraulic pump comprises a hydraulic pump body, wherein the hydraulic pump body comprises a ball valve assembly, an oil outlet path, an oil return path and a first connecting path. The oil outlet path is communicated with the oil return path through the first connecting path, an oil return circular ring is arranged in the first connecting path, the ball valve assembly is positioned in the first connecting path, and the cross section of a through hole of the oil return circular ring is smaller than the maximum cross section of the first ball valve in the ball valve assembly;

the electric hydraulic pump further comprises a first motor, an oil return rod and a cam assembly, the cam assembly is installed on an output shaft of the first motor, one end of the oil return rod is abutted to the cam assembly, the other end of the oil return rod is located in the first connecting circuit and connected with the ball valve assembly, and an encoder is installed on the output shaft of the first motor.

The working principle is as follows:

the hydraulic pump body may refer to a hydraulic pump on the market that can be connected to and provide hydraulic pressure to a hydraulic tool. On this basis, this technical scheme's hydraulic pump main part is equipped with ball valve subassembly, goes out oil circuit, returns oil circuit and has the connection way one of oil return ring. During operation, oil flows through the oil outlet passage to the pressurizing area of the hydraulic pump main body. When the oil is not in operation, the oil flows back through the oil return circuit. The first oil return path and the first oil outlet path can be on the same horizontal plane, namely the first connecting path is transversely arranged. Or the oil return path is arranged at the upper side, the oil outlet path is arranged at the lower side, and the connecting path is longitudinally arranged.

The ball valve assembly is located in the first connecting path and can move in the first connecting path. In the ball valve assembly, as is conventional in the art, a gap is also provided between the ball valve assembly and the sidewall of the first connecting passage so that oil can flow through the gap. The oil return circular ring is formed by extending from one inner part of the first connecting path to the center, and the aperture of the oil return circular ring is smaller than that of the first connecting path, so that the ball valve assembly cannot penetrate through the oil return circular ring. When the ball valve assembly is abutted to the oil return circular ring, the ball valve assembly is tightly abutted to the hole edge of the oil return circular ring, so that oil is difficult to flow through the oil return circular ring, the oil return path and the oil outlet path are cut off, and oil is prevented from flowing to the oil return path when oil is discharged.

The electric hydraulic pump of the technical scheme further comprises a first motor, and the first motor drives the ball valve assembly to move in the first connecting path through the cam assembly and the oil return rod. The first motor converts rotation into linear reciprocating motion of the oil return rod through the cam assembly. The oil return rod is connected with the ball valve assembly. In both embodiments, the ball valve assembly may be located on the side of the return ring adjacent the return line, or the ball valve assembly may be located on the side of the return ring adjacent the return line. The oil return rod drives the ball valve assembly to move together, so that the clearance between the ball valve assembly and the oil return circular ring is changed, and the oil return speed is changed. The clearance is a little smaller, and the oil return speed is a little larger. The clearance is a little larger, and the oil return speed is a little smaller.

The encoder of the technical scheme is installed on a motor shaft of the motor I, and can accurately detect the shaft rotating speed of the motor in real time and detect the rotating angle of the motor shaft in real time. The rotating angle of the first motor corresponds to the moving distance of the oil return rod through the encoder, so that the gap between the ball valve assembly and the oil return ring is accurately controlled. Therefore, the speed of oil return can be accurately controlled, and the device is suitable for various conditions and is very convenient.

Preferably, the hydraulic pump main body comprises a pump driving mechanism, the first connecting path is longitudinally arranged, the upper end of the first connecting path is communicated with the oil return path, the lower end of the first connecting path is communicated with the oil outlet path, the lower end of the first connecting path is provided with a pressure sensor, and the pressure sensor is electrically connected with the pump driving mechanism.

The beneficial effects are as follows:

the pump drive mechanism is used for sucking oil out of an oil storage chamber of the hydraulic pump main body. Pump drive mechanisms are known in the art. According to the technical scheme, the pressure sensor is arranged at the lower end of the first connecting path. Pressure sensor and connecting way one intercommunication, pressure sensor and play oil way intercommunication promptly, pressure sensor can test out the oil pressure when producing oil like this to give the pump actuating mechanism with oil pressure data feedback, adjust pump actuating mechanism oil speed with this, and then reach the effect that can accurate control oil pressure.

Preferably, the ball valve assembly is located the oil return ring is close to one side of oil outlet way, the ball valve assembly includes ball valve one, spring one and disk seat, ball valve one is arranged in on the disk seat, the both ends of spring one butt respectively the disk seat with pressure sensor.

The beneficial effects are as follows:

the ball valve assembly is positioned on one side of the oil return ring close to the oil outlet path, and the oil return rod penetrates through the oil return ring to drive the ball valve assembly to move. In this technical scheme, oil return rod and ball valve butt, oil return rod move to a play oil circuit direction under the drive of motor one, and then ball valve moves down, and spring that is located this moment between disk seat and the pressure sensor receives the compression and produces the restoring force. At the moment, the first ball valve is not tightly abutted to the oil return circular ring any more, so that oil can flow to the oil return path from a gap between the first ball valve and the oil return circular ring. After oil return is finished, the oil return rod resets, and under the action of the restoring force of the spring I, the ball valve I resets until the ball valve I is tightly abutted to the oil return circular ring, so that blocking of an oil return path is realized.

Preferably, the electrically-driven hydraulic pump includes aircraft bonnet one, install aircraft bonnet one on the hydraulic pump main part, the cam subassembly includes the eccentric wheel, the one end of motor one is located the aircraft bonnet in the lump with an aircraft bonnet fixed connection, the eccentric wheel is installed on the output shaft of motor one, the eccentric wheel with the oil return pole butt.

The beneficial effects are as follows:

the eccentric wheel is installed on the output shaft of motor one, and the side of eccentric wheel and oil return pole butt can make oil return pole rotate downwards when the eccentric wheel rotates like this, and then drives oil return pole and remove downwards. Compared with a hydraulic pump adopting a connecting rod device in the prior art, one end of the first motor is arranged on the first hood, and the main body of the first motor and the main body of the hydraulic pump are distributed vertically, so that the space occupied by the electric hydraulic pump is reduced, and the component layout of the electric hydraulic pump is more compact and attractive.

Preferably, the electrically-driven hydraulic pump includes aircraft bonnet one, the aircraft bonnet one is installed in the hydraulic pump main part, the cam subassembly includes eccentric wheel and cam, the one end of motor one is located the aircraft bonnet in the lump with an aircraft bonnet fixed connection, the eccentric wheel is installed on the output shaft of motor one, the one end of cam rotates to be connected on the aircraft bonnet one, the side of going up of cam with the eccentric wheel butt, the downside of cam with the oil return pole butt.

The beneficial effects are as follows:

the eccentric wheel is installed on the output shaft of motor one, and the side and the cam butt of eccentric wheel can make the cam rotate downwards when the eccentric wheel rotates like this, and then the cam drives the oil return pole and moves downwards. Compared with a hydraulic pump adopting a connecting rod device in the prior art, one end of the first motor is arranged on the first hood, and the main body of the first motor and the main body of the hydraulic pump are distributed vertically, so that the space occupied by the electric hydraulic pump is reduced, and the component layout of the electric hydraulic pump is more compact and attractive.

Preferably, the encoder is fixedly connected with the eccentric wheel.

The working principle and the beneficial effects are as follows:

the eccentric wheel rotates to drive the oil return rod to move downwards, so that the rotating angle of the eccentric wheel is positively correlated with the downward moving distance of the oil return rod within a certain angle range, namely within the range, the larger the rotating angle of the eccentric wheel is, the more the downward moving distance of the oil return rod is, the larger the gap between the ball valve I and the oil return ring is, and the more the oil return amount is in unit time. The gap between the first ball valve and the oil return circular ring is adjusted through the eccentric wheel, so that the oil return speed is changed conveniently. The encoder is used for quantifying and feeding back the rotation angle of the eccentric wheel and adjusting the rotation angle of the eccentric wheel and data fed back by a user according to the encoder, so that accurate control is achieved, and the oil return effect desired by the user is achieved.

Preferably the electric hydraulic pump comprises a second spring, the second spring is sleeved on the oil return rod, a first boss is arranged in the first connecting circuit, a second boss is arranged on the oil return rod, and two ends of the second spring are respectively abutted to the first boss and the second boss.

The beneficial effects are as follows:

the eccentric wheel drives the oil return rod to move downwards through the cam assembly, and therefore the first ball valve is driven to move downwards. And at the connection position of the eccentric wheel and the output shaft of the first motor, defining the position a at which the outer side surface of the eccentric wheel is farthest from the connection position of the eccentric wheel, and defining the position b at which the outer side surface of the eccentric wheel is closest to the connection position of the eccentric wheel.

When the eccentric wheel rotates, the cam rotates downwards in the process from the abutting joint of the cam and the point b to the abutting joint of the cam and the point a, the oil return rod is further driven to move downwards until the cam abuts against the point a, the oil return rod reaches the maximum distance of downward movement, and the gap between the first ball valve and the oil return ring is maximum at the moment. Because the oil return rod moves downwards, the second spring arranged between the first boss and the second boss is extruded to generate restoring force.

The eccentric wheel continues to rotate, the cam rotates upwards under the action of restoring force of the second spring from the abutting of the point a to the abutting of the point B, the oil return rod is further driven to move upwards, the oil return rod resets until the cam abuts of the point B, and at the moment, the first ball valve is tightly abutted to the oil return ring.

Through the setting of spring two, realize returning oil way and the switching of going out oil way.

Preferably, the oil return rod comprises an upper oil return rod and a lower oil return rod, the first connecting path comprises an upper connecting path and a lower connecting path, the upper oil return rod is arranged on the upper connecting path, the lower oil return rod is arranged on the lower connecting path, the spring is sleeved on the upper oil return rod, the first boss is arranged on the upper connecting path, and the second boss is arranged on the upper oil return rod;

the electric hydraulic pump also comprises a third spring, the third spring is sleeved on the oil return lower rod, a third boss is arranged in the connecting lower path, a fourth boss is arranged on the oil return lower rod, and two ends of the third spring are respectively abutted against the third boss and the fourth boss;

the electric hydraulic pump further comprises an oil return handle, the oil return handle is provided with a butting portion, and two ends of the butting portion are respectively butted with the oil return upper rod and the oil return lower rod.

The working principle and the beneficial effects are as follows:

the oil return handle is arranged between the oil return upper rod and the oil return lower rod, when the oil return handle is not operated (namely not touched), the eccentric wheel enables the oil return upper rod and the oil return lower rod to move together by abutting against the oil return upper rod, and can reset under the action of the second spring and the third spring. If the electric hydraulic pump fails, the eccentric wheel is caused to rotate not as expected. Thus, an operator can pull the oil return handle, for example, the oil return handle is pulled downwards, and the oil return handle is abutted against the oil return lower rod to enable the oil return lower rod to move downwards. Under the action of the third spring, the oil return handle can be easily pulled upwards, and the oil return lower rod is reset.

Preferably, the electric hydraulic pump comprises a joint assembly, the hydraulic pump body comprises a pump body, the oil outlet path, the oil return path and the first connecting path are arranged in the pump body, the pump body is provided with a first mounting cavity, the first mounting cavity is communicated with the oil outlet path, and one end of the joint assembly is connected with the first mounting cavity.

The working principle is as follows:

the joint component is used for externally connecting various hydraulic tools, including hydraulic tools such as split type scissors, split type press-fit, split type punching and split type bent arrangement. The pump body is equipped with installation cavity one, and the installation cavity is located to the one end of joint Assembly. The oil outlet of the oil outlet is provided with hydraulic pressure to the joint assembly, so that a hydraulic tool connected with the joint assembly can normally operate.

Preferably the electric hydraulic pump comprises an oil bag, the oil return path and the oil outlet path are communicated with the oil bag, the oil outlet path is provided with an oil outlet, and one side of the oil outlet, which is far away from the oil bag, is provided with a ball valve II.

The working principle and the beneficial effects are as follows:

the oil bag is used for storing oil. When oil is needed, the oil is discharged from the oil bag and flows to the first installation cavity through the outlet. When oil is returned, the oil returns to the oil bag through the oil return path from the mounting cavity. Because the oil outlet path is provided with an oil outlet and the oil outlet is provided with a ball valve II. When oil is used, the second ball valve can be pushed open by the oil. During oil return, because the flow of the oil is opposite to that during oil outlet, the oil return enables the ball valve II to be tightly abutted against the oil outlet, and therefore the oil cannot return to the oil bag along the oil outlet path.

Preferably the hydraulic pump main part includes plunger pump and second aircraft bonnet, two fixed mounting of aircraft bonnet are in the pump body, the one end of plunger pump and the equal fixed mounting in one end of pump actuating mechanism are in the second aircraft bonnet, the other end setting of plunger pump is in the pump body, the oil pocket of plunger pump respectively with go out the oil circuit with the oil bag intercommunication, pump actuating mechanism with the plunger pump is connected just pump actuating mechanism can drive the plunger pump.

The beneficial effects are as follows:

the plunger pump is driven by the pump driving mechanism and can move up and down to generate air pressure difference, so that the oil bag can discharge oil. The second hood covers the plunger pump and part of the pump driving machine, plays a role in dust prevention, and can be used for mounting and supporting the hood together.

Compared with the prior art, the invention has the following advantages:

1. the encoder is arranged on a motor shaft of the motor I, and can accurately detect the speed of the motor in real time and detect the rotating angle of the motor in real time. And the rotating angle of the first motor corresponds to the moving distance of the oil return rod through the encoder, so that the gap between the ball valve assembly and the oil return ring is accurately controlled. Therefore, the speed of oil return can be accurately controlled, and the device is suitable for various conditions and is very convenient.

2. Compared with the mode that the electromagnetic valve drives the oil return valve through the connecting rod in the prior art, the arrangement of the output shaft of the first motor is connected with the cam assembly and drives the oil return rod through the cam assembly, so that the whole occupied space of the electric hydraulic pump is small.

Drawings

Fig. 1 is a schematic structural diagram of an electric hydraulic pump according to a first embodiment.

Fig. 2 is a schematic view of the electric hydraulic pump according to the first embodiment with the first and second covers removed.

Fig. 3 is an enlarged view of a in fig. 2.

Fig. 4 is a schematic structural view of the cam assembly according to the first embodiment.

Fig. 5 is a schematic structural view of the electric hydraulic pump according to the first embodiment.

Fig. 6 is a schematic sectional view taken at E-E in fig. 5.

Fig. 7 is an enlarged view of fig. 6 at B.

Fig. 8 is an enlarged view at C in fig. 6.

Fig. 9 is a schematic structural view of the electric hydraulic pump according to the first embodiment.

Fig. 10 is a schematic sectional view taken at F-F in fig. 9.

Fig. 11 is an enlarged view at D in fig. 10.

Fig. 12 is a schematic structural view of the electric hydraulic pump according to the first embodiment.

Fig. 13 is a schematic sectional view taken at G-G in fig. 12.

Fig. 14 is a schematic structural view of the electric hydraulic pump according to the second embodiment.

Fig. 15 is a schematic structural view of the electric hydraulic pump according to the second embodiment.

Fig. 16 is a schematic sectional view taken at H-H in fig. 15.

Fig. 17 is an enlarged view at I in fig. 16.

Fig. 18 is an enlarged view at J in fig. 16.

In the figure, the position of the first and second end faces,

1. a hydraulic pump main body;

101. a pump body; 111. an oil outlet path; 1111. an oil outlet; 1112. a ball valve II; 112. an oil return path; 113. connecting a first path; 1131. an oil return ring; 1132. a first boss; 1133. connecting an upper path; 1134. connecting a lower path; 11341. a boss III; 114. a first mounting cavity;

102. a ball valve assembly; 121. a first ball valve; 122. a first spring; 123. a valve seat; 13. a pump drive mechanism;

103. a plunger pump;

104. a second hood;

2. a first motor;

3. an oil return rod; 31. a second boss; 32. an oil return upper rod; 33. returning oil to the lower rod; 331. a boss IV;

4. a cam assembly; 401. an eccentric wheel; 402. a cam;

5. an encoder;

6. a pressure sensor;

7. a first engine cover;

8. a second spring;

9. a joint assembly;

10. an oil bag;

11. an oil return handle; 111. an abutting portion;

12. and a third spring.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

The first embodiment is as follows:

as shown in fig. 1 to 8, an electric hydraulic pump includes a hydraulic pump body 1, and the hydraulic pump body 1 includes a ball valve assembly 102, an oil outlet path 111, an oil return path 112, and a first connecting path 113. As shown in fig. 9-13, the oil outlet path 111 is communicated with the oil return path 112 through the first connecting path 113, an oil return ring 1131 is disposed in the first connecting path 113, the ball valve assembly 102 is disposed in the first connecting path 113, and a through hole cross section of the oil return ring 1131 is smaller than a maximum cross section of the first ball valve 121 in the ball valve assembly 102.

As shown in fig. 1, 2 and 4, the electric hydraulic pump includes a motor 2, an oil return rod 3 and a cam assembly 4, the cam assembly 4 is installed on an output shaft of the motor 2, one end of the oil return rod 3 abuts against the cam assembly 4, the other end of the oil return rod 3 is located in a connecting passage 113 and connected with a ball valve assembly 102, and an encoder 5 is installed on the output shaft of the motor 2.

The hydraulic pump body 1 may refer to a hydraulic pump on the market that can be connected to and provide hydraulic pressure to a hydraulic tool. On the basis, the hydraulic pump body 1 of the present embodiment is provided with a ball valve assembly 102, an oil outlet path 111, an oil return path 112, and a first connecting path 113 having an oil return ring 1131. During operation, oil flows through the oil outlet passage 111 to the pressurized region of the hydraulic pump main body 1. When not in operation, oil flows back through the return line 112. The first oil return path 112 and the first oil return path 111 can be on the same horizontal plane, i.e. the first connecting path 113 is transversely arranged. The oil return path 112 may be arranged at the upper side and the oil outlet path 111 at the lower side, and the first connecting path 113 may be arranged vertically.

As shown in fig. 3 and 8, the ball valve assembly 102 is located within the first connecting passage 113 and is movable within the first connecting passage 113. The ball valve assembly 102, as is conventional in the art, also has a gap between the ball valve assembly 102 and the sidewall of the first connecting passage 113 so that oil can flow through the gap. The oil return ring 1131 is formed by extending from one position inside the first connecting passage 113 to the center, and the aperture of the oil return ring 1131 is smaller than that of the first connecting passage 113, so that the ball valve assembly 102 cannot pass through the oil return ring 1131. When the ball valve assembly 102 abuts against the oil return ring 1131, the ball valve assembly 102 abuts against the hole edge of the oil return ring 1131 tightly, so that the oil is difficult to flow through the oil return ring 1131, and at this time, the oil return path 112 is cut off from the oil outlet path 111, and the oil is prevented from flowing to the oil return path 112 during oil outlet.

As shown in fig. 1 and 2, the electric hydraulic pump of the present embodiment further includes a motor i 2, and the motor i 2 drives the ball valve assembly 102 to move in the connecting passage i 113 through the cam assembly 4 and the return rod 3. The first motor 2 converts rotation into linear reciprocating motion of the oil return rod 3 through the cam assembly 4. The return rod 3 is connected to the ball valve assembly 102. In both embodiments, the ball valve assembly 102 may be located on the side of the return ring 1131 adjacent to the return line 112, or the ball valve assembly 102 may be located on the side of the return ring 1131 adjacent to the return line 111. The oil return rod 3 moves the ball valve assembly 102 together to change the gap between the ball valve assembly 102 and the oil return ring 1131, thereby changing the speed of oil return. The clearance is a little smaller, and the oil return speed is a little smaller. The clearance is a little larger, and the oil return speed is a little larger.

As shown in FIG. 2, the encoder 5 of the technical scheme is installed on the motor shaft of the first motor 2, and the encoder 5 can accurately detect the rotating speed of the motor shaft in real time and detect the rotating angle of the motor shaft in real time. The clearance between the ball valve assembly 102 and the oil return ring 1131 is accurately controlled by the encoder 5 by corresponding the rotation angle of the first motor 2 to the moving distance of the oil return rod 3. Therefore, the speed of oil return can be accurately controlled, and the device is suitable for various conditions and is very convenient.

As shown in fig. 1, 2 and 5, the hydraulic pump main body 1 includes a pump driving mechanism 13, a first connecting path 113 is longitudinally arranged, an upper end of the first connecting path 113 is communicated with the oil return path 112, a lower end of the first connecting path 113 is communicated with the oil outlet path 111, a pressure sensor 6 is arranged at a lower end of the first connecting path 113, and the pressure sensor 6 is electrically connected to the pump driving mechanism 13.

The pump drive mechanism 13 is for sucking oil from the oil reservoir chamber of the hydraulic pump main body 1. The pump drive mechanism 13 is prior art. According to the technical scheme, the pressure sensor 6 is arranged at the lower end of the first connecting passage 113 and used for detecting the oil outlet pressure on the oil passage 111. Pressure sensor 6 can test out the oil pressure when producing oil like this to give oil pressure data feedback to pump actuating mechanism 13, adjust pump actuating mechanism 13 speed of producing oil with this, and then reach the effect that can accurate control oil pressure.

As shown in fig. 3, 6 and 7, the ball valve assembly 102 is located on one side of the oil return circular ring 1131 close to the oil outlet 111, the ball valve assembly 102 includes a first ball valve 121, a first spring 122 and a valve seat 123, the first ball valve 121 is placed on the valve seat 123, and two ends of the first spring 122 abut against the valve seat 123 and the pressure sensor 6, respectively.

The ball valve assembly 102 is positioned on the side of the oil return ring 1131 adjacent to the oil outlet 111 such that the oil return rod 3 passes through the oil return ring 1131 to drive the ball valve assembly 102. In the technical scheme, the oil return rod 3 is abutted against the first ball valve 121, the oil return rod 3 is driven by the first motor 2 to move towards the oil outlet path 111, then the first ball valve 121 moves downwards, and at the moment, the first spring 122 between the valve seat 123 and the pressure sensor 6 is compressed to generate restoring force. At this time, since the first ball valve 121 and the oil return ring 1131 are no longer in close contact, oil can flow from the gap between the first ball valve 121 and the oil return ring 1131 to the oil return path 112. After oil return is completed, the oil return rod 3 resets, and under the action of the restoring force of the first spring 122, the first ball valve 121 resets until the first ball valve is tightly abutted to the oil return circular ring 1131, so that the oil return path 112 is blocked.

As shown in fig. 1, 5 and 6, the electric hydraulic pump includes a first cover 7, the first cover 7 is mounted on the hydraulic pump body 1, the cam assembly 4 includes an eccentric 401 and a cam 402, one end of the motor 2 is located on the first cover 7 and fixedly connected with the first cover 7, the eccentric 401 is mounted on an output shaft of the motor 2, one end of the cam 402 is rotatably connected to the first cover 7, an upper side of the cam 402 abuts against the eccentric 401, and a lower side of the cam 402 abuts against the oil return rod 3.

The eccentric wheel 401 is installed on an output shaft of the motor I2, and the side face of the eccentric wheel 401 is abutted to the cam 402, so that when the eccentric wheel 401 rotates, the cam 402 can rotate downwards, and the cam 402 drives the oil return rod 3 to move downwards. Compare with the hydraulic pump that adopts link means among the prior art, the one end of a 2 motor of this technical scheme is installed on aircraft bonnet 7, and a 2 hydraulic pump main part 1 of motor distribute from top to bottom, have reduced the shared space of electronic hydraulic pump, make electronic hydraulic pump's part overall arrangement seem compacter, pleasing to the eye.

As shown in fig. 6, the encoder 5 is fixedly connected to the eccentric 401.

The eccentric wheel 401 rotates to drive the oil return rod 3 to move downwards, so that the rotating angle of the eccentric wheel 401 is positively correlated with the downward moving distance of the oil return rod 3 within a certain angle range, namely within the range, the larger the rotating angle of the eccentric wheel 401 is, the more the oil return rod 3 moves downwards, and the larger the gap between the ball valve one 121 and the oil return ring 1131 is, the more oil is returned in unit time. The gap between the first ball valve 121 and the oil return ring 1131 is adjusted by the eccentric wheel 401, so as to change the oil return speed, which is very convenient. The encoder 5 is used for quantifying and feeding back the rotation angle of the eccentric wheel 401, and adjusting the rotation angle with the data fed back by the user according to the encoder 5, so as to perform accurate control, and achieve the oil return effect desired by the user.

As shown in fig. 2, 6 and 7, the electric hydraulic pump includes a second spring 8, the second spring 8 is sleeved on the oil return rod 3, a first boss 1132 is arranged in the first connecting path 113, a second boss 31 is arranged on the oil return rod 3, and two ends of the second spring 8 are respectively abutted to the first boss 1132 and the second boss 31.

The eccentric wheel 401 drives the oil return rod 3 to move downwards through the cam assembly 4, and therefore the downward movement of the ball valve I121 is driven. At the connection position of the eccentric wheel 401 and the output shaft of the motor I2, the position where the outer side face of the eccentric wheel 401 is farthest away from the connection position is defined as a, and the position where the outer side face of the eccentric wheel 401 is closest to the connection position is defined as b.

When the eccentric wheel 401 rotates, in the process from the abutment of the cam 402 with the point b to the abutment of the cam 402 with the point a, the cam 402 rotates downwards, and then the oil return rod 3 is driven to move downwards until the cam 402 abuts with the point a, the oil return rod 3 reaches the maximum distance of moving downwards, and at the moment, the gap between the first ball valve 121 and the oil return ring 1131 is maximum. Since the return oil rod 3 moves downward, the second spring 8 disposed between the first land 1132 and the second land 31 is pressed to generate a restoring force.

The eccentric wheel 401 continues to rotate, in the process that the cam 402 abuts against the point a to the point B, the cam 402 rotates upwards under the action of the restoring force of the spring II 8, the oil return rod 3 is further driven to move upwards, until the cam 402 abuts against the point B, the oil return rod 3 resets, and at the moment, the ball valve I121 is tightly abutted against the oil return ring 1131.

The oil return path 112 and the oil outlet path 111 are switched by the second spring 8.

As shown in fig. 1 and 6, the electric hydraulic pump includes a joint assembly 9, the hydraulic pump body 1 includes a pump body 101, an oil outlet path 111, an oil return path 112 and a first connecting path 113 are disposed in the pump body 101, the pump body 101 is provided with a first mounting cavity 114, the first mounting cavity 114 is communicated with the oil outlet path 111, and one end of the joint assembly 9 is connected with the first mounting cavity 114.

A plurality of oil paths are reserved in the pump body 101, and the reserved oil paths can be called by combining the encoder 5 according to the actual use environment and the working requirements to participate in actual work, such as single-inlet single-outlet oil paths or double-inlet double-outlet oil paths, so that more working requirements are met.

The joint component 9 is used for externally connecting various hydraulic tools, including hydraulic tools such as split type scissors, split type press-embedding, split type punching and split type bent arrangement. The pump body 101 is provided with a first mounting cavity 114 in which one end of the joint assembly 9 is arranged. The oil outlet 111 provides hydraulic pressure to the joint assembly 9 so that the hydraulic tool connected to the joint assembly 9 can operate normally.

As shown in fig. 13, the electric hydraulic pump includes an oil bag 10, the oil return path 112 and the oil outlet path 111 are both communicated with the oil bag 10, the oil outlet path 111 is provided with an oil outlet 1111, and one side of the oil outlet 1111, which is far away from the oil bag 10, is provided with a second ball valve 1112.

The oil bag 10 is used for storing oil. When oil is needed, the oil flows out from the oil bag 10 to the first installation cavity 114 through the outlet oil. When oil returns, the oil flows from the first mounting cavity 114 to the oil bag 10 through the oil return path 112. Because the oil outlet 111 is provided with an oil outlet 1111 and the oil outlet 1111 is provided with a ball valve two 1112. When oil is used, the oil can push the second ball valve 1112 open. During oil return, the flow of oil is opposite to that during oil outlet, and the oil return enables the second ball valve 1112 to be tightly abutted with the oil outlet 1111, so that the oil cannot return to the oil bag 10 along the oil outlet path 111.

As shown in fig. 2 and 6, the hydraulic pump main body 1 includes a plunger pump 103 and a second housing 104, the second housing 104 is fixedly mounted in the pump body 101, one end of the plunger pump 103 and one end of the pump driving mechanism 13 are both fixedly mounted in the second housing 104, the other end of the plunger pump 103 is disposed in the pump body 101, an oil chamber of the plunger pump 103 is respectively communicated with the oil outlet passage 111 and the oil bag 10, the pump driving mechanism 13 is connected with the plunger pump 103, and the pump driving mechanism 13 can drive the plunger pump 103.

The plunger pump 103 is driven by the pump drive mechanism 13, and the plunger pump 103 can move up and down to generate a pneumatic pressure difference, so that the oil bag 10 discharges oil. The second hood 104 covers the plunger pump 103 and the pump drive mechanism 13, plays a role of dust prevention, and can play a role of mounting and supporting the first hood 7.

Example two:

as shown in fig. 14 to 18, this embodiment is substantially the same as the first embodiment, except that the cam assembly 4 of this embodiment does not include the cam 402, and the oil return rod 3 of this embodiment can abut against the eccentric 401, so that when the eccentric 401 rotates, the oil return rod 3 can be rotated downward, and the oil return rod 3 is driven to move downward. The oil return rod 3 is divided into an oil return upper rod 32 and an oil return lower rod 33. Correspondingly, the first connecting path 113 is divided into an upper connecting path 1133 and a lower connecting path 1134. The oil return upper rod 32 is arranged on the connecting upper path 1133, the oil return lower rod 33 is arranged on the connecting lower path 1134, the spring II 8 is sleeved on the oil return upper rod 32, the boss I1132 is positioned on the connecting upper path 1133, and the boss II 31 is positioned on the oil return upper rod 32;

the electric hydraulic pump also comprises a third spring 12, the third spring 12 is sleeved on the oil return lower rod 33, a third boss 11341 is arranged in the connecting lower path 1134, a fourth boss 331 is arranged on the oil return lower rod 33, and two ends of the third spring 12 are respectively abutted against the third boss 11341 and the fourth boss 331;

the electric hydraulic pump further includes an oil return handle 11, the oil return handle 11 has an abutting portion 111, and both ends of the abutting portion 111 abut against the oil return upper rod 32 and the oil return lower rod 33, respectively.

The oil return handle 11 is arranged between the oil return upper rod 32 and the oil return lower rod 33, and when the oil return handle 11 is not operated (i.e. not touched), the eccentric wheel 401 enables the oil return upper rod 32 and the oil return lower rod 33 to move together by abutting against the oil return upper rod 32, and can be reset under the action of the second spring 8 and the third spring 12. If the electric hydraulic pump fails, the eccentric 401 is not rotated as expected. In this way, the operator can pull the oil return handle 11, for example, by pulling the oil return handle 11 downward, and the oil return handle 11 moves the oil return lower rod 33 downward by abutting against the oil return lower rod 33. Under the action of the third spring 12, the oil return handle 11 can be easily pulled upwards, and the oil return lower rod 33 is reset.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. An electric hydraulic pump comprising a hydraulic pump body (1) characterized in that,

the hydraulic pump main body (1) comprises a ball valve assembly (102), an oil outlet path (111), an oil return path (112) and a first connecting path (113), the oil outlet path (111) is communicated with the oil return path (112) through the first connecting path (113), an oil return circular ring (1131) is arranged in the first connecting path (113), the ball valve assembly (102) is located in the first connecting path (113), and the cross section of a through hole of the oil return circular ring (1131) is smaller than the maximum cross section of a first ball valve (121) in the ball valve assembly (102);

the electric hydraulic pump further comprises a motor I (2), an oil return rod (3) and a cam assembly (4), wherein the cam assembly (4) is installed on an output shaft of the motor I (2), one end of the oil return rod (3) is abutted to the cam assembly (4), the other end of the oil return rod (3) is located in a connecting path I (113) and connected with the ball valve assembly (102), and an encoder (5) is installed on an output shaft of the motor I (2).

2. The electric hydraulic pump according to claim 1, characterized in that the hydraulic pump main body (1) includes a pump driving mechanism (13), the first connecting path (113) is disposed longitudinally, an upper end of the first connecting path (113) communicates with the return path (112), a lower end of the first connecting path (113) communicates with the outlet path (111), a lower end of the first connecting path (113) is provided with a pressure sensor (6), and the pressure sensor (6) is electrically connected to the pump driving mechanism (13).

3. The electric hydraulic pump according to claim 2, characterized in that the ball valve assembly (102) is located on a side of the oil return ring (1131) close to the oil outlet path (111), the ball valve assembly (102) comprises a first ball valve (121), a first spring (122) and a valve seat (123), the first ball valve (121) is disposed on the valve seat (123), and two ends of the first spring (122) abut against the valve seat (123) and the pressure sensor (6), respectively.

4. The electric hydraulic pump of claim 3, characterized in that the electric hydraulic pump comprises a first cover (7), the first cover (7) is mounted on the hydraulic pump body (1), the cam assembly (4) comprises an eccentric wheel (401), one end of the first electric motor (2) is located on the first cover (7) and is fixedly connected with the first cover (7), the eccentric wheel (401) is mounted on an output shaft of the first electric motor (2), and the eccentric wheel (401) abuts against the oil return rod (3).

5. The electric hydraulic pump according to claim 3, characterized in that the electric hydraulic pump comprises a first cover (7), the first cover (7) is mounted on the hydraulic pump body (1), the cam assembly (4) comprises an eccentric wheel (401) and a cam (402), one end of the first motor (2) is located on the first cover (7) and is fixedly connected with the first cover (7), the eccentric wheel (401) is mounted on an output shaft of the first motor (2), one end of the cam (402) is rotatably connected on the first cover (7), an upper side of the cam (402) is abutted with the eccentric wheel (401), and a lower side of the cam (402) is abutted with the oil return rod (3).

6. The electric hydraulic pump according to claim 4 or 5, characterized in that the encoder (5) is fixedly connected with the eccentric (401).

7. The electric hydraulic pump of claim 6, characterized in that the electric hydraulic pump comprises a second spring (8), the second spring (8) is sleeved on the oil return rod (3), a first boss (1132) is arranged in the first connecting path (113), a second boss (31) is arranged on the oil return rod (3), and two ends of the second spring (8) are respectively abutted to the first boss (1132) and the second boss (31).

8. The electric hydraulic pump of claim 7, characterized in that the oil return rod (3) comprises an oil return upper rod (32) and an oil return lower rod (33), the first connecting path (113) comprises a connecting upper path (1133) and a connecting lower path (1134), the oil return upper rod (32) is arranged on the connecting upper path (1133), the oil return lower rod (33) is arranged on the connecting lower path (1134), the second spring (8) is sleeved on the oil return upper rod (32), the first boss (1132) is arranged on the connecting upper path (1133), and the second boss (31) is arranged on the oil return upper rod (32);

the electric hydraulic pump further comprises a spring III (12), the spring III (12) is sleeved on the oil return lower rod (33), a boss III (11341) is arranged in the connecting lower path (1134), a boss IV (331) is arranged on the oil return lower rod (33), and two ends of the spring III (12) are respectively abutted to the boss III (11341) and the boss IV (331);

the electric hydraulic pump further comprises an oil return handle (11), the oil return handle (11) is provided with a butting part (111), and two ends of the butting part (111) are respectively butted with the oil return upper rod (32) and the oil return lower rod (33).

9. The electric hydraulic pump according to claim 8, characterized in that the electric hydraulic pump comprises a joint component (9), the hydraulic pump body (1) comprises a pump body (101), the oil outlet path (111), the oil return path (112) and the first connecting path (113) are arranged in the pump body (101), the pump body (101) is provided with a first mounting cavity (114), the first mounting cavity (114) is communicated with the oil outlet path (111), and one end of the joint component (9) is connected with the first mounting cavity (114).

10. The electric hydraulic pump of claim 9, characterized in that the electric hydraulic pump comprises an oil bag (10), the oil return path (112) and the oil outlet path (111) are both communicated with the oil bag (10), the oil outlet path (111) is provided with an oil outlet (1111), and one side of the oil outlet (1111), which is far away from the oil bag (10), is provided with a second ball valve (1112).

The hydraulic pump main part (1) includes plunger pump (103) and two aircraft bonnets (104), two aircraft bonnet (104) fixed mounting are in the pump body (101), the one end of plunger pump (103) and the equal fixed mounting of one end of pump actuating mechanism (13) is in two aircraft bonnet (104), the other end setting of plunger pump (103) is in the pump body (101), the oil pocket of plunger pump (103) respectively with go out oil circuit (111) with oil bag (10) intercommunication, pump actuating mechanism (13) with plunger pump (103) are connected just pump actuating mechanism (13) can drive plunger pump (103).