An electro-hydraulic pump

Abstract

The application provides an electric hydraulic pump, and belongs to the technical field of hydraulic pumps. The electric hydraulic pump can control the speed of oil return. The hydraulic pump body comprises a ball valve assembly, an oil outlet path, an oil return path and a connecting path one. The oil outlet path is communicated with the oil return path through the connecting path one. The connecting path one is provided with an oil return ring. The ball valve assembly is located in the connecting path one. The cross section of the through hole of the oil return ring is smaller than the maximum cross section of a ball valve one in the ball valve assembly. The electric hydraulic pump comprises a motor one, an oil return rod and a cam assembly. The cam assembly is installed on the output shaft of the motor one. One end of the oil return rod abuts against the cam assembly. The other end of the oil return rod is located in the connecting path one and connected with the ball valve assembly. An encoder is installed on the output shaft of the motor one. 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 ring. In this way, the speed of oil return can be accurately controlled.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic pump technology and relates to an electric hydraulic pump. Background Technology

[0002] An electric hydraulic pump (including rechargeable hydraulic pumps and lithium-ion hydraulic pumps) is a hydraulic component that provides pressurized fluid for hydraulic transmission. It is mainly used as a power source for industrial and civilian hydraulic equipment in fields such as automotive dismantling, material shearing, and strength testing. Electric hydraulic pumps can be used with hydraulic tools such as split-type shears, split-type presses, split-type punches, and split-type bending tools. Electric hydraulic pumps generally contain their own hydraulic oil.

[0003] Existing hydraulic pumps include an oil bag, a piston pump, and a return valve. The piston pump dispenses oil from the oil bag, and the return valve returns hydraulic oil to the oil bag. The return valve is connected to a solenoid valve via a connecting rod. The solenoid valve drives the return valve to move via the connecting rod, thereby opening the return path. However, this opening method is like a simple on / off switch; the operator cannot control the speed of the return flow, which is inconvenient. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned technical problems by proposing an electric hydraulic pump that solves the problem that existing hydraulic pumps cannot control the speed of oil return.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] An electric hydraulic pump includes a hydraulic pump body, which includes a ball valve assembly, an oil outlet passage, an oil return passage, and a connecting passage. The oil outlet passage is connected to the oil return passage through the connecting passage, and a return oil ring is provided in the connecting passage. The ball valve assembly is located in the connecting passage, and the cross-sectional area of ​​the through hole of the return oil ring is smaller than the maximum cross-sectional area of ​​the ball valve in the ball valve assembly.

[0007] The electric hydraulic pump also includes a motor, a return rod, and a cam assembly. The cam assembly is mounted on the output shaft of the motor. One end of the return rod abuts against the cam assembly, and the other end of the return rod is located in the connecting circuit and connected to the ball valve assembly. An encoder is mounted on the output shaft of the motor.

[0008] Its working principle is:

[0009] The hydraulic pump body can refer to any commercially available hydraulic pump that can connect to and provide hydraulic force to hydraulic tools. Based on this, the hydraulic pump body of this technical solution includes a ball valve assembly, an oil outlet circuit, an oil return circuit, and a connecting circuit with a return annular ring. During operation, oil flows through the oil outlet circuit to the pressurization zone of the hydraulic pump body. When not in operation, the oil returns through the oil return circuit. The first oil return circuit and the first oil outlet circuit can be on the same horizontal plane, i.e., the first connecting circuit is horizontally arranged. Alternatively, the oil return circuit can be on top and the oil outlet circuit on the bottom, in which case the first connecting circuit is vertically arranged.

[0010] The ball valve assembly is located within and movable within the connecting passage. As in the prior art, a gap exists between the ball valve assembly and the side wall of the connecting passage, allowing oil to flow through. A return annulus extends from a point inside the connecting passage towards the center. The diameter of the return annulus is smaller than the diameter of the connecting passage, preventing the ball valve assembly from passing through it. When the ball valve assembly abuts against the return annulus, the ball valve assembly and the edge of the return annulus's hole are tightly pressed together, making it difficult for oil to flow through the return annulus. This effectively disconnects the return and outlet oil passages, preventing oil from flowing back into the return passage during outlet operation.

[0011] The electric hydraulic pump in this technical solution also includes a motor, which drives a ball valve assembly to move within a connecting passage via a cam assembly and a return rod. The motor converts rotation into linear reciprocating motion of the return rod via the cam assembly. The return rod is connected to the ball valve assembly. Two embodiments are available: the ball valve assembly can be located on the side of the return ring closer to the return passage, or it can be located on the side of the return ring closer to the outlet passage. The return rod moves the ball valve assembly together, thereby changing the gap between the ball valve assembly and the return ring, thus changing the return oil speed. A smaller gap results in a larger return oil speed, and vice versa.

[0012] In this technical solution, the encoder is mounted on the motor shaft of motor one. The encoder can accurately detect the rotation speed and angle of the motor shaft in real time. By correlating the rotation angle of motor one with the movement distance of the return oil rod, the gap between the ball valve assembly and the return oil ring can be precisely controlled. This allows for precise control of the return oil speed, is applicable to various situations, and is very convenient.

[0013] Preferably, the hydraulic pump body includes a pump drive mechanism, the first connecting road is arranged longitudinally, the upper end of the first connecting road is connected to the return oil road, the lower end of the first connecting road is connected to the outlet oil road, and a pressure sensor is provided at the lower end of the first connecting road, the pressure sensor being electrically connected to the pump drive mechanism.

[0014] Its beneficial effects are:

[0015] The pump drive mechanism is used to draw oil from the oil storage chamber of the hydraulic pump body. This pump drive mechanism is existing technology. In this technical solution, a pressure sensor is installed at the lower end of connection line one. The pressure sensor is connected to connection line one, that is, the pressure sensor is connected to the oil outlet line. This allows the pressure sensor to test the oil pressure during oil discharge and feed the pressure data back to the pump drive mechanism, thereby adjusting the oil discharge speed of the pump drive mechanism and achieving precise control of the oil pressure.

[0016] Preferably, the ball valve assembly is located on the side of the return oil ring closer to the oil outlet. The ball valve assembly includes a ball valve, a spring, and a valve seat. The ball valve is placed on the valve seat, and the two ends of the spring abut against the valve seat and the pressure sensor, respectively.

[0017] Its beneficial effects are:

[0018] The ball valve assembly is located on the side of the return oil ring closer to the oil outlet, allowing the return oil rod to pass through the return oil ring and drive the ball valve assembly to move. In this technical solution, the return oil rod abuts against ball valve one. Driven by motor one, the return oil rod moves towards the oil outlet, causing ball valve one to move downwards. At this time, spring one, located between the valve seat and the pressure sensor, is compressed, generating a restoring force. Since ball valve one is no longer in tight contact with the return oil ring, oil can flow through the gap between ball valve one and the return oil ring to the return oil circuit. After the return oil is completed, the return oil rod returns to its original position. Under the restoring force of spring one, ball valve one returns to its original position until it is in tight contact with the return oil ring, thus blocking the return oil circuit.

[0019] Preferably, the electric hydraulic pump includes a housing, which is mounted on the main body of the hydraulic pump. The cam assembly includes an eccentric wheel. One end of the motor is located on the housing and fixedly connected to it. The eccentric wheel is mounted on the output shaft of the motor and abuts against the return rod.

[0020] Its beneficial effects are:

[0021] An eccentric wheel is mounted on the output shaft of motor one, with its side abutting against the return rod. When the eccentric wheel rotates, it causes the return rod to rotate downwards, thereby moving the return rod downwards. Compared to existing hydraulic pumps that use a linkage mechanism, in this design, one end of motor one is mounted on the casing one, and the main body of the motor-hydraulic pump is vertically distributed, reducing the space occupied by the electric hydraulic pump and making its component layout more compact and aesthetically pleasing.

[0022] Preferably, the electric hydraulic pump includes a housing, which is mounted on the main body of the hydraulic pump. The cam assembly includes an eccentric wheel and a cam. One end of the motor is located on the housing and fixedly connected to it. The eccentric wheel is mounted on the output shaft of the motor. One end of the cam is rotatably connected to the housing. The upper side of the cam abuts against the eccentric wheel, and the lower side of the cam abuts against the return rod.

[0023] Its beneficial effects are:

[0024] An eccentric wheel is mounted on the output shaft of motor one, and the side of the eccentric wheel abuts against the cam. When the eccentric wheel rotates, it causes the cam to rotate downwards, which in turn drives the return rod to move downwards. Compared to existing hydraulic pumps that use a linkage mechanism, in this technical solution, one end of motor one is mounted on the housing one, and the main body of the motor-hydraulic pump is vertically distributed, reducing the space occupied by the electric hydraulic pump and making the component layout of the electric hydraulic pump appear more compact and aesthetically pleasing.

[0025] Preferably, the encoder is fixedly connected to the eccentric wheel.

[0026] Its working principle and beneficial effects are as follows:

[0027] The rotation of the eccentric wheel drives the return rod downwards. Therefore, within a certain angle range, the angle of rotation of the eccentric wheel is positively correlated with the downward distance of the return rod. That is, within this range, the larger the angle of rotation of the eccentric wheel, the greater the downward distance of the return rod. This results in a larger gap between the ball valve and the return ring, and a greater amount of oil return per unit time. Adjusting the gap between the ball valve and the return ring using the eccentric wheel is very convenient for changing the return speed. The encoder quantifies and feeds back the angle of rotation of the eccentric wheel, allowing the user to adjust the control based on the encoder feedback data, thereby achieving precise control and the desired oil return effect.

[0028] Preferably, the electric hydraulic pump includes a second spring, which is sleeved on the return rod. A first boss is provided in the first connecting channel, and a second boss is provided on the return rod. The two ends of the second spring abut against the first boss and the second boss, respectively.

[0029] Its beneficial effects are:

[0030] The eccentric wheel drives the return rod downwards via the cam assembly, thereby causing the ball valve one to move downwards. At the connection between the eccentric wheel and the output shaft of motor one, the position furthest from the connection point of the outer surface of the eccentric wheel is defined as 'a', and the position closest to the connection point of the outer surface of the eccentric wheel is defined as 'b'.

[0031] When the eccentric wheel rotates, as the cam moves from contacting point b to contacting point a, it rotates downwards, causing the return rod to move downwards until it contacts point a, at which point the return rod reaches its maximum downward distance. At this point, the gap between ball valve one and the return ring is at its maximum. Because the return rod moves downwards, spring two, located between boss one and boss two, is compressed and generates a restoring force.

[0032] As the eccentric wheel continues to rotate, during the process of the cam moving from contacting point a to contacting point b, the cam rotates upward under the restoring force of spring two, which in turn drives the return rod to move upward until the cam contacts point B, at which point the return rod returns to its original position, and the ball valve one and the return ring are tightly connected.

[0033] The switching between the return oil path and the outlet oil path is achieved by setting spring 2.

[0034] Preferably, the oil return rod includes an upper oil return rod and a lower oil return rod, the first connecting road includes an upper connecting road and a lower connecting road, the upper oil return rod is placed on the upper connecting road, the lower oil return rod is placed on the lower connecting road, the second spring is sleeved on the upper oil return rod, the first boss is located on the upper connecting road, and the second boss is located on the upper oil return rod;

[0035] The electric hydraulic pump also includes a spring three, which is sleeved on the return oil lower rod. The connecting lower circuit is provided with a boss three, and the return oil lower rod is provided with a boss four. The two ends of the spring three abut against the boss three and the boss four respectively.

[0036] The electric hydraulic pump also includes a return oil handle, which has an abutment portion, and the two ends of the abutment portion abut against the upper return oil rod and the lower return oil rod, respectively.

[0037] Its working principle and beneficial effects are as follows:

[0038] The return oil handle is positioned between the upper and lower return oil rods. When the return oil handle is not operated (i.e., not touched), the eccentric wheel moves both the upper and lower return oil rods together by abutting against the upper return oil rod, and can be reset by the action of springs two and three. If the electric hydraulic pump malfunctions, causing the eccentric wheel to not rotate as expected, the operator can move the return oil handle, for example, downwards. The return oil handle abuts against the lower return oil rod, causing the lower return oil rod to move downwards. Under the action of spring three, the return oil handle can be easily moved upwards, and the lower return oil rod resets.

[0039] Preferably, the electric hydraulic pump includes a connector assembly, the hydraulic pump body includes a pump body, the oil outlet, the oil return and connecting lines are disposed in the pump body, the pump body has an installation cavity, the installation cavity is connected to the oil outlet, and one end of the connector assembly is connected to the installation cavity.

[0040] Its working principle is:

[0041] The connector assembly is used to connect various hydraulic tools, including split-type scissors, split-type press-fitters, split-type punchers, split-type bending tools, and other hydraulic tools. The pump body has a mounting cavity, and one end of the connector assembly is located within this cavity. The oil outlet provides hydraulic pressure to the connector assembly, enabling the connected hydraulic tools to operate normally.

[0042] Preferably, the electric hydraulic pump includes an oil bag, and both the return oil path and the outlet oil path are connected to the oil bag. The outlet oil path is provided with an oil outlet, and a ball valve is provided on the side of the oil outlet away from the oil bag.

[0043] Its working principle and beneficial effects are as follows:

[0044] The oil bag is used for oil storage. When oil is needed, it flows from the oil bag through the outlet oil path to the first mounting chamber. When oil returns, it flows from the first mounting chamber through the return oil path to the oil bag. Because the outlet oil path has an outlet port and a ball valve (second ball valve) is installed at the outlet port, the oil can open the ball valve (second ball valve) when needed. When oil returns, since the oil flow is in the opposite direction to the outlet flow, the returning oil causes the ball valve (second ball valve) to tightly contact the outlet port, thus preventing oil from returning to the oil bag along the outlet oil path.

[0045] Preferably, the hydraulic pump body includes a plunger pump and a housing 2. The housing 2 is fixedly installed in the pump body. One end of the plunger pump and one end of the pump drive mechanism are both fixedly installed in the housing 2. The other end of the plunger pump is located in the pump body. The oil chamber of the plunger pump is connected to the oil outlet and the oil bag respectively. The pump drive mechanism is connected to the plunger pump and can drive the plunger pump.

[0046] Its beneficial effects are:

[0047] The plunger pump is driven by a pump drive mechanism. The plunger pump can move up and down to generate a pressure difference, thereby causing oil to be discharged from the oil bag. The hood covers the plunger pump and the pump drive mechanism, serving to prevent dust and also providing support for the installation of the hood.

[0048] Compared with the prior art, the present invention has the following advantages:

[0049] 1. The encoder of this invention is mounted on the motor shaft of motor one. The encoder can accurately detect the motor speed and rotation angle in real time. By correlating the rotation angle of motor one with the movement distance of the oil return rod through the encoder, the gap between the ball valve assembly and the oil return ring can be accurately controlled. This allows for precise control of the oil return speed, is applicable to various situations, and is very convenient.

[0050] 2. The output shaft of the motor of the present invention is connected to the cam assembly and drives the return oil rod through the cam assembly. Compared with the prior art, which uses a solenoid valve to drive the return oil valve through a connecting rod, this setting makes the overall space occupied by the electric hydraulic pump smaller. Attached Figure Description

[0051] Figure 1 This is a schematic diagram of the structure of the electric hydraulic pump in Example 1. Figure 1 .

[0052] Figure 2 This is a schematic diagram of the mechanism for removing the first and second covers of the electric hydraulic pump in Embodiment 1.

[0053] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0054] Figure 4 This is a schematic diagram of the cam assembly in Embodiment 1.

[0055] Figure 5 This is a schematic diagram of the structure of the electric hydraulic pump in Example 1. Figure 2 .

[0056] Figure 6 yes Figure 5 Schematic diagram of the cross section at the EE point.

[0057] Figure 7 yes Figure 6 Enlarged view of section B in the middle.

[0058] Figure 8 yes Figure 6 Enlarged view of point C in the middle.

[0059] Figure 9 This is a schematic diagram of the structure of the electric hydraulic pump in Example 1. Figure 3 .

[0060] Figure 10 yes Figure 9 Schematic diagram of the cross section at the middle FF point.

[0061] Figure 11 yes Figure 10 Enlarged view of point D in the middle.

[0062] Figure 12 This is a schematic diagram of the structure of the electric hydraulic pump in Example 1. Figure 4 .

[0063] Figure 13 yes Figure 12 Schematic diagram of the cross section at point GG.

[0064] Figure 14 This is a schematic diagram of the structure of the electric hydraulic pump in Embodiment 2. Figure 1 .

[0065] Figure 15 This is a schematic diagram of the structure of the electric hydraulic pump in Embodiment 2. Figure 2 .

[0066] Figure 16 yes Figure 15 Schematic diagram of the cross section at HH.

[0067] Figure 17 yes Figure 16 Enlarged view of section I in the middle.

[0068] Figure 18 yes Figure 16 Enlarged view of section J in the middle.

[0069] In the picture,

[0070] 1. Hydraulic pump body;

[0071] 101. Pump body; 111. Oil outlet; 1111. Oil outlet; 1112. Ball valve 2; 112. Oil return path; 113. Connecting path 1; 1131. Oil return ring; 1132. Boss 1; 1133. Upper connecting path; 1134. Lower connecting path; 11341. Boss 3; 114. Mounting cavity 1;

[0072] 102. Ball valve assembly; 121. Ball valve one; 122. Spring one; 123. Valve seat; 13. Pump drive mechanism;

[0073] 103. Plunger pump;

[0074] 104. Machine cover two;

[0075] 2. Motor 1;

[0076] 3. Return rod; 31. Boss 2; 32. Upper return rod; 33. Lower return rod; 331. Boss 4;

[0077] 4. Cam assembly; 401. Eccentric wheel; 402. Cam;

[0078] 5. Encoder;

[0079] 6. Pressure sensor;

[0080] 7. Machine cover one;

[0081] 8. Spring Two;

[0082] 9. Connector assembly;

[0083] 10. Oil bags;

[0084] 11. Return oil handle;

[0085] 12. Spring Three. Detailed Implementation

[0086] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0087] Example 1:

[0088] like Figures 1-8 As shown, an electric hydraulic pump includes a hydraulic pump body 1, which includes a ball valve assembly 102, an oil outlet passage 111, an oil return passage 112, and a connecting passage 113. Figures 9-13 As shown, the oil outlet 111 is connected to the return oil line 112 through the connecting line 113. The connecting line 113 is provided with a return oil ring 1131. The ball valve assembly 102 is located in the connecting line 113. The cross-sectional area of ​​the through hole of the return oil ring 1131 is smaller than the maximum cross-sectional area of ​​the ball valve 121 in the ball valve assembly 102.

[0089] like Figure 1 , Figure 2 and Figure 4 As shown, the electric hydraulic pump includes a motor 2, a return rod 3, and a cam assembly 4. The cam assembly 4 is mounted on the output shaft of the motor 2. One end of the return rod 3 abuts against the cam assembly 4, and the other end of the return rod 3 is located in the connecting channel 113 and connected to the ball valve assembly 102. An encoder 5 is mounted on the output shaft of the motor 2.

[0090] The hydraulic pump body 1 can refer to a commercially available hydraulic pump that can be connected to and provide hydraulic force to hydraulic tools. Based on this, the hydraulic pump body 1 of this technical solution includes a ball valve assembly 102, an oil outlet 111, an oil return 112, and a connecting passage 113 with a return annulus 1131. During operation, oil flows through the oil outlet 111 to the pressurization zone of the hydraulic pump body 1. When not in operation, the oil returns through the oil return 112. The oil return 112 and the oil outlet 111 can be on the same horizontal plane, i.e., the connecting passage 113 is arranged horizontally. Alternatively, the oil return 112 can be on top and the oil outlet 111 on the bottom, in which case the connecting passage 113 is arranged vertically.

[0091] like Figure 3 and Figure 8As shown, the ball valve assembly 102 is located within the connecting passage 113 and is movable within it. As in the prior art, a gap exists between the ball valve assembly 102 and the side wall of the connecting passage 113, allowing oil to flow through. A return oil ring 1131 extends from a point inside the connecting passage 113 towards the center. The diameter of the return oil ring 1131 is smaller than the diameter of the connecting passage 113, preventing the ball valve assembly 102 from passing through it. When the ball valve assembly 102 abuts against the return oil ring 1131, the ball valve assembly 102 is in close contact with the edge of the return oil ring 1131's hole, making it difficult for oil to flow through. At this point, the return oil passage 112 and the outlet oil passage 111 are disconnected, preventing oil from flowing into the return oil passage 112 during outlet operation.

[0092] like Figure 1 and Figure 2 As shown, the electric hydraulic pump of this technical solution also includes a motor 2. Motor 2 drives the ball valve assembly 102 to move within the connecting passage 113 via a cam assembly 4 and a return rod 3. Motor 2 converts rotation into linear reciprocating motion of the return rod 3 via the cam assembly 4. The return rod 3 is connected to the ball valve assembly 102. There are two embodiments: the ball valve assembly 102 can be located on the side of the return ring 1131 closer to the return passage 112, or the ball valve assembly 102 can be located on the side of the return ring 1131 closer to the outlet passage 111. The return rod 3 moves the ball valve assembly 102 together, thereby changing the gap between the ball valve assembly 102 and the return ring 1131, thus changing the return oil speed. A smaller gap results in a slower return oil speed, and a larger gap results in a faster return oil speed.

[0093] like Figure 2 As shown, the encoder 5 of this technical solution is mounted on the motor shaft of motor 2. The encoder 5 can accurately detect the rotation speed and rotation angle of the motor shaft in real time. Through the encoder 5, the rotation angle of motor 2 is correlated with the moving distance of the return oil rod 3, thereby precisely controlling the gap between the ball valve assembly 102 and the return oil ring 1131. This allows for precise control of the return oil speed, is applicable to various situations, and is very convenient.

[0094] like Figure 1 , Figure 2 and Figure 5 As shown, the hydraulic pump body 1 includes a pump drive mechanism 13, a connecting road 113 is arranged longitudinally, the upper end of the connecting road 113 is connected to the return oil road 112, the lower end of the connecting road 113 is connected to the outlet oil road 111, and a pressure sensor 6 is provided at the lower end of the connecting road 113. The pressure sensor 6 is electrically connected to the pump drive mechanism 13.

[0095] The pump drive mechanism 13 is used to draw oil from the oil storage chamber of the hydraulic pump body 1. The pump drive mechanism 13 is existing technology. In this technical solution, a pressure sensor 6 is installed at the lower end of the connecting line 113 to detect the oil pressure at the outlet of the oil line 111. Thus, when oil is discharged, the pressure sensor 6 can test the oil pressure and feed the pressure data back to the pump drive mechanism 13, thereby adjusting the oil discharge speed of the pump drive mechanism 13 and achieving precise control of the oil pressure at the outlet.

[0096] like Figure 3 , Figure 6 and Figure 7 As shown, the ball valve assembly 102 is located on the side of the return oil ring 1131 near the oil outlet 111. The ball valve assembly 102 includes a ball valve 121, a spring 122 and a valve seat 123. The ball valve 121 is placed on the valve seat 123, and the two ends of the spring 122 abut against the valve seat 123 and the pressure sensor 6, respectively.

[0097] The ball valve assembly 102 is located on the side of the return oil ring 1131 near the oil outlet 111, so that the return oil rod 3 passes through the return oil ring 1131 to drive the ball valve assembly 102 to move. In this technical solution, the return oil rod 3 abuts against the ball valve 121. Driven by the motor 2, the return oil rod 3 moves towards the oil outlet 111, and the ball valve 121 moves downward. At this time, the spring 122 located between the valve seat 123 and the pressure sensor 6 is compressed and generates a restoring force. Since the ball valve 121 and the return oil ring 1131 are no longer in tight contact, oil can flow from the gap between the ball valve 121 and the return oil ring 1131 to the return oil line 112. After the return oil is completed, the return oil rod 3 returns to its original position. Under the restoring force of the spring 122, the ball valve 121 returns to its original position until it is in tight contact with the return oil ring 1131, thereby blocking the return oil line 112.

[0098] like Figure 1 , Figure 5 and Figure 6 As shown, the electric hydraulic pump includes a housing 7, which is mounted on the hydraulic pump body 1. The cam assembly 4 includes an eccentric wheel 401 and a cam 402. One end of the motor 2 is located on the housing 7 and is fixedly connected to the housing 7. The eccentric wheel 401 is mounted on the output shaft of the motor 2. One end of the cam 402 is rotatably connected to the housing 7. The upper side of the cam 402 abuts against the eccentric wheel 401, and the lower side of the cam 402 abuts against the return rod 3.

[0099] An eccentric wheel 401 is mounted on the output shaft of motor 2, and its side abuts against cam 402. When the eccentric wheel 401 rotates, it causes cam 402 to rotate downwards, which in turn drives the return rod 3 to move downwards. Compared to existing hydraulic pumps using linkage mechanisms, in this design, one end of motor 2 is mounted on the housing 7, and the main body 1 of the hydraulic pump is vertically distributed, reducing the space occupied by the electric hydraulic pump and making its component layout more compact and aesthetically pleasing.

[0100] like Figure 6 As shown, encoder 5 is fixedly connected to eccentric wheel 401.

[0101] The rotation of the eccentric wheel 401 drives the return rod 3 to move downwards. Therefore, within a certain angle range, the rotation angle of the eccentric wheel 401 is positively correlated with the downward movement distance of the return rod 3. That is, within this range, the larger the rotation angle of the eccentric wheel 401, the greater the downward movement distance of the return rod 3. This results in a larger gap between the ball valve 121 and the return ring 1131, leading to a greater return oil volume per unit time. Adjusting the gap between the ball valve 121 and the return ring 1131 using the eccentric wheel 401 is very convenient for changing the return oil speed. The encoder 5 quantifies and feeds back the rotation angle of the eccentric wheel 401, allowing the user to adjust the control based on the data fed back by the encoder 5, thereby achieving precise control and the desired return oil effect.

[0102] like Figure 2 , Figure 6 and Figure 7 As shown, the electric hydraulic pump includes a second spring 8, which is sleeved on the return rod 3. A first boss 1132 is provided in the connecting channel 113, and a second boss 31 is provided on the return rod 3. The two ends of the second spring 8 abut against the first boss 1132 and the second boss 31, respectively.

[0103] The eccentric wheel 401 drives the return rod 3 downward through the cam assembly 4, thereby causing the ball valve 121 to move downward. At the connection between the eccentric wheel 401 and the output shaft of the motor 2, the position where the outer surface of the eccentric wheel 401 is furthest from the connection point is defined as a, and the position where the outer surface of the eccentric wheel 401 is closest to the connection point is defined as b.

[0104] When the eccentric wheel 401 rotates, as the cam 402 moves from contacting point b to contacting point a, the cam 402 rotates downwards, thereby driving the return rod 3 to move downwards until the cam 402 contacts point a, at which point the return rod 3 reaches its maximum downward distance. At this point, the gap between the ball valve 121 and the return ring 1131 is at its maximum. Because the return rod 3 moves downwards, the spring 8 located between the boss 1132 and the boss 21 is compressed, generating a restoring force.

[0105] As the eccentric wheel 401 continues to rotate, during the process of the cam 402 moving from contacting point a to contacting point b, the cam 402 rotates upward under the restoring force of the spring 8, which in turn drives the return rod 3 to move upward until the cam 402 contacts point B, at which point the return rod 3 returns to its original position, and the ball valve 121 and the return ring 1131 are tightly connected.

[0106] The switching between the return oil circuit 112 and the outlet oil circuit 111 is achieved by setting the second spring 8.

[0107] like Figure 1 and Figure 6 As shown, the electric hydraulic pump includes a connector assembly 9, and the hydraulic pump body 1 includes a pump body 101. An oil outlet 111, an oil return 112, and a connecting line 113 are arranged inside the pump body 101. The pump body 101 has an installation cavity 114, which is connected to the oil outlet 111. One end of the connector assembly 9 is connected to the installation cavity 114.

[0108] The pump body 101 has multiple oil circuits pre-installed. Depending on the actual usage environment and work requirements, the pre-installed oil circuits can be called in conjunction with the encoder 5 to participate in the actual work, such as a single inlet and single outlet oil circuit or a double inlet and double outlet oil circuit, thereby adapting to more work requirements.

[0109] The connector assembly 9 is used to connect various hydraulic tools, including split-type scissors, split-type press-fitters, split-type punchers, split-type bending tools, and other hydraulic tools. The pump body 101 has a mounting cavity 114, and one end of the connector assembly 9 is located within the mounting cavity. The oil outlet 111 provides hydraulic pressure to the connector assembly 9, enabling the hydraulic tools connected to the connector assembly 9 to operate normally.

[0110] like Figure 13 As shown, the electric hydraulic pump includes an oil bag 10, and both the return oil line 112 and the outlet oil line 111 are connected to the oil bag 10. The outlet oil line 111 is provided with an outlet 1111, and a ball valve 1112 is provided on the side of the outlet 1111 away from the oil bag 10.

[0111] Oil bag 10 is used for oil storage. When oil is needed, it flows from oil bag 10 through the outlet oil path to mounting cavity 114. When oil returns, it flows from mounting cavity 114 through return oil path 112 back to oil bag 10. Because the outlet oil path 111 has an outlet 1111 and a ball valve 1112 is installed at the outlet 1111, when oil is needed, the ball valve 1112 can be opened. When oil returns, since the oil flow is in the opposite direction to the outlet flow, the return oil causes the ball valve 1112 to come into tight contact with the outlet 1111, so the oil will not return to oil bag 10 along the outlet oil path 111.

[0112] like Figure 2 and Figure 6As shown, the hydraulic pump body 1 includes a plunger pump 103 and a housing 104. The housing 104 is fixedly installed inside the pump body 101. One end of the plunger pump 103 and one end of the pump drive mechanism 13 are both fixedly installed inside the housing 104. The other end of the plunger pump 103 is located inside the pump body 101. The oil chamber of the plunger pump 103 is connected to the oil outlet 111 and the oil bag 10, respectively. The pump drive mechanism 13 is connected to the plunger pump 103 and can drive the plunger pump 103.

[0113] The plunger pump 103 is driven by the pump drive mechanism 13. The plunger pump 103 can move up and down to generate a pressure difference, thereby causing the oil bag 10 to dispense oil. The second cover 104 covers part of the plunger pump 103 and the pump drive mechanism 13, which serves to prevent dust and also provides installation support for the first cover 7.

[0114] Example 2:

[0115] like Figures 14-18 As shown, this embodiment is largely the same as embodiment one, except that the cam assembly 4 in this embodiment does not include cam 402. In this embodiment, the return rod 3 can abut against the eccentric wheel 401, so that when the eccentric wheel 401 rotates, the return rod 3 can rotate downward, thereby driving the return rod 3 to move downward. The return rod 3 is divided into an upper return rod 32 and a lower return rod 33. Correspondingly, the connecting path 113 is divided into an upper connecting path 1133 and a lower connecting path 1134. The upper return rod 32 is placed on the upper connecting path 1133, the lower return rod 33 is placed on the lower connecting path 1134, the second spring 8 is sleeved on the upper return rod 32, the boss 1132 is located on the upper connecting path 1133, and the second boss 31 is located on the upper return rod 32.

[0116] The electric hydraulic pump also includes a spring 12, which is sleeved on the return oil lower rod 33. The lower connecting channel 1134 is provided with a boss 11341, and the return oil lower rod 33 is provided with a boss 331. The two ends of the spring 12 abut against the boss 11341 and the boss 331 respectively.

[0117] The electric hydraulic pump also includes a return handle 11, which has an abutment part, and the two ends of the abutment part abut against the upper return rod 32 and the lower return rod 33, respectively.

[0118] The return oil handle 11 is positioned between the upper return oil rod 32 and the lower return oil rod 33. When the return oil handle 11 is not operated (i.e., not touched), the eccentric wheel 401 abuts against the upper return oil rod 32, causing both the upper and lower return oil rods 32 and 33 to move together. It can then be reset by the action of springs 8 and 12. If the electro-hydraulic pump malfunctions, causing the eccentric wheel 401 to not rotate as expected, the operator can move the return oil handle 11, for example, downwards. The return oil handle 11 abuts against the lower return oil rod 33, causing the lower return oil rod 33 to move downwards. Under the action of spring 12, the return oil handle 11 can be easily moved upwards, resetting the lower return oil rod 33.

[0119] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. An electric hydraulic pump, comprising a hydraulic pump body (1), characterized in that, The hydraulic pump body (1) includes a ball valve assembly (102), an oil outlet (111), an oil return (112), and a connecting line (113). The oil outlet (111) is connected to the oil return (112) through the connecting line (113). The connecting line (113) is provided with an oil return ring (1131). The ball valve assembly (102) is located in the connecting line (113). The cross-sectional area of ​​the through hole of the oil return ring (1131) is smaller than the maximum cross-sectional area of ​​the ball valve (121) in the ball valve assembly (102). The electric hydraulic pump also includes a motor (2), a return rod (3) and a cam assembly (4). The cam assembly (4) is mounted on the output shaft of the motor (2). One end of the return rod (3) abuts against the cam assembly (4), and the other end of the return rod (3) is located in the connecting road (113) and connected to the ball valve assembly (102). An encoder (5) is mounted on the output shaft of the motor (2). The hydraulic pump body (1) includes a pump drive mechanism (13), the first connecting road (113) is arranged longitudinally, the upper end of the first connecting road (113) is connected to the return oil road (112), the lower end of the first connecting road (113) is connected to the outlet oil road (111), and a pressure sensor (6) is provided at the lower end of the first connecting road (113). The pressure sensor (6) is electrically connected to the pump drive mechanism (13). The ball valve assembly (102) is located on the side of the return oil ring (1131) near the oil outlet (111). The ball valve assembly (102) includes a ball valve (121), a spring (122) and a valve seat (123). The ball valve (121) is placed on the valve seat (123), and the two ends of the spring (122) abut against the valve seat (123) and the pressure sensor (6) respectively.

2. The electric hydraulic pump according to claim 1, characterized in that, The electric hydraulic pump includes a housing (7), which is mounted on the hydraulic pump body (1). The cam assembly (4) includes an eccentric wheel (401). One end of the motor (2) is located on the housing (7) and is fixedly connected to the housing (7). The eccentric wheel (401) is mounted on the output shaft of the motor (2) and abuts against the return rod (3).

3. The electric hydraulic pump according to claim 1, characterized in that, The electric hydraulic pump includes a housing (7), which is mounted on the hydraulic pump body (1). The cam assembly (4) includes an eccentric wheel (401) and a cam (402). One end of the motor (2) is located on the housing (7) and is fixedly connected to the housing (7). The eccentric wheel (401) is mounted on the output shaft of the motor (2). One end of the cam (402) is rotatably connected to the housing (7). The upper side of the cam (402) abuts against the eccentric wheel (401), and the lower side of the cam (402) abuts against the return rod (3).

4. The electric hydraulic pump according to claim 2 or 3, characterized in that, The encoder (5) is fixedly connected to the eccentric wheel (401).

5. The electric hydraulic pump according to claim 4, characterized in that, The electric hydraulic pump includes a second spring (8), which is sleeved on the return rod (3). The first connecting road (113) is provided with a first boss (1132), and the return rod (3) is provided with a second boss (31). The two ends of the second spring (8) abut against the first boss (1132) and the second boss (31) respectively.

6. The electric hydraulic pump according to claim 5, characterized in that, The return rod (3) includes an upper return rod (32) and a lower return rod (33). The first connecting road (113) includes an upper connecting road (1133) and a lower connecting road (1134). The upper return rod (32) is placed on the upper connecting road (1133), and the lower return rod (33) is placed on the lower connecting road (1134). The second spring (8) is sleeved on the upper return rod (32). The first boss (1132) is located on the upper connecting road (1133), and the second boss (31) is located on the upper return rod (32). The electric hydraulic pump also includes a spring three (12), which is sleeved on the return oil lower rod (33). The connecting lower road (1134) is provided with a boss three (11341), and the return oil lower rod (33) is provided with a boss four (331). The two ends of the spring three (12) abut against the boss three (11341) and the boss four (331) respectively. The electric hydraulic pump also includes a return handle (11), which has an abutment portion, and the two ends of the abutment portion abut against the upper return rod (32) and the lower return rod (33) respectively.

7. The electric hydraulic pump according to claim 6, characterized in that, The electric hydraulic pump includes a connector assembly (9), the hydraulic pump body (1) includes a pump body (101), the oil outlet (111), the oil return (112) and the connecting line (113) are arranged in the pump body (101), the pump body (101) has an installation cavity (114), the installation cavity (114) is connected to the oil outlet (111), and one end of the connector assembly (9) is connected to the installation cavity (114).

8. The electric hydraulic pump according to claim 7, characterized in that, The electric hydraulic pump includes an oil bag (10), the return oil passage (112) and the outlet oil passage (111) are both connected to the oil bag (10), the outlet oil passage (111) is provided with an outlet (1111), and a ball valve (1112) is provided on the side of the outlet oil passage (1111) away from the oil bag (10). The hydraulic pump body (1) includes a plunger pump (103) and a housing (104). The housing (104) is fixedly installed inside the pump body (101). One end of the plunger pump (103) and one end of the pump drive mechanism (13) are both fixedly installed inside the housing (104). The other end of the plunger pump (103) is located inside the pump body (101). The oil chamber of the plunger pump (103) is connected to the oil outlet (111) and the oil bag (10) respectively. The pump drive mechanism (13) is connected to the plunger pump (103) and can drive the plunger pump (103).

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