Press type quick oil return structure of electric hydraulic clamp

Abstract

A pressing type quick oil return structure of an electric hydraulic clamp is characterized in that the front end of a hydraulic cylinder body is fixedly connected with a clamp head, a movable piston is arranged in the hydraulic cylinder body, a first spring is arranged between the piston and the clamp head, an oil bag is fixedly connected to the rear end of the hydraulic cylinder body, and an inner cavity of the oil bag is used for storing oil. The plunger, the first one-way valve and the second one-way valve are all installed in the hydraulic cylinder body, the plunger reciprocates to enable oil to be supplied from the oil bag to the hydraulic cylinder body in a one-way mode, the motor foot stool is fixed to the side portion of the hydraulic cylinder body, a driving shaft is installed in the motor foot stool, a driving cam is arranged on the driving shaft, and the driving cam drives the plunger to reciprocate. The pressure relief oil way is formed on the hydraulic cylinder body, an inner cavity of the hydraulic cylinder body is communicated with an inner cavity of the oil bag through the pressure relief oil way, the oil return valve and the safety valve are both arranged on the pressure relief oil way, and the oil return pressing piece is arranged on the motor foot stand; through the arrangement of the oil return pressing piece, oil return and pressure relief become convenient, fast and efficient, and the electric hydraulic clamp is more convenient to clamp and higher in efficiency.

Description

Technical Field

[0001] The utility model relates to a press-type quick oil return structure of an electric hydraulic pliers. Background Art

[0002] Common electric hydraulic pliers on the market are generally powered by lithium batteries. The motor drives the plunger to move back and forth to achieve one-way oil supply, generating hydraulic force to make the piston move to meet the needs of clamping the workpiece. Conventional electric hydraulic pliers are equipped with a pressure relief oil circuit, and a return oil valve is configured on the pressure relief oil circuit. By controlling the return oil valve, rapid pressure relief can be achieved to quickly release the clamped workpiece.

[0003] Because in the existing electric hydraulic pliers structure, the control of the oil return valve is achieved by screwing a screw, resulting in low oil return efficiency, which affects the clamping efficiency of the electric hydraulic pliers. In addition, when the electric hydraulic valve is clamping the pipe workpiece, the clamping force cannot be too large. Excessive clamping force can easily cause deformation of the pipe wall of the pipe workpiece. Summary of the Invention

[0004] In order to solve the above-mentioned problems, the present invention provides a push-type quick oil return structure for electric hydraulic pliers.

[0005] To achieve the above-mentioned purpose, the present invention provides a push-type rapid oil return structure for an electric hydraulic pliers, comprising:

[0006] A hydraulic cylinder body, wherein the front end of the hydraulic cylinder body is fixedly connected to a clamp head, a movable piston is provided in the hydraulic cylinder body, and a first spring is arranged between the piston and the clamp head, and the first spring enables the piston to maintain a backward movement trend;

[0007] An oil bag, the oil bag being fixedly connected to the rear end of the hydraulic cylinder body, and the inner cavity of the oil bag being used for storing oil;

[0008] A plunger and a first one-way valve and a second one-way valve, wherein the plunger, the first one-way valve and the second one-way valve are all installed in the hydraulic cylinder body, and the reciprocating motion of the plunger causes the oil to be supplied from the oil bag to the hydraulic cylinder body in a one-way manner;

[0009] A motor bracket, the motor bracket being fixed to the side of the hydraulic cylinder body, a drive shaft being installed in the motor bracket, a drive cam being arranged on the drive shaft, and the drive cam driving the plunger to perform reciprocating motion;

[0010] A pressure relief oil circuit, an oil return valve, and a safety valve, wherein the pressure relief oil circuit is formed on the hydraulic cylinder body and connects the inner cavity of the hydraulic cylinder body with the inner cavity of the oil bag. The oil return valve and the safety valve are both provided on the pressure relief oil circuit;

[0011] The oil return pressing member is arranged on the motor bracket, and the oil return pressing member includes a supporting part formed at the middle position as a fulcrum, a pressing part formed at one end position for pressing, and an acting part formed at the other end position for acting with the oil return valve.

[0012] Furthermore, the oil bag is provided with an oil filling hole, and an oil plug for sealing is arranged at the position of the oil filling hole.

[0013] Furthermore, an oil cover is provided at the rear end of the hydraulic cylinder body, and the oil cover covers the oil bag therein to provide protection.

[0014] Furthermore, a motor is disposed on the motor bracket, and a transmission connection is formed between the output shaft of the motor and the drive shaft.

[0015] Furthermore, the pressure relief oil circuit includes oil circuit one, oil circuit two, and oil circuit three which are connected to each other. The safety valve is arranged at the oil circuit two and is always connected to the inner cavity of the hydraulic cylinder body via the oil circuit one.

[0016] Furthermore, the oil return valve includes an oil return valve seat fixedly mounted on the hydraulic cylinder body, an oil return valve stem and a valve stem spring arranged in the oil return valve seat, and a through hole is machined on the oil return valve seat to connect with the oil circuit three.

[0017] Furthermore, the oil return valve also includes a steel ball arranged on one side of the oil return valve stem and a holding spring for holding the steel ball.

[0018] The beneficial effects of the present invention compared to the prior art are:

[0019] 1. The setting of the oil return pressing piece makes the oil return pressure relief convenient and efficient, and the clamping of the electric hydraulic pliers is more convenient and more efficient.

[0020] 2. Equipped with a safety valve, when the pressure is too high, the electric hydraulic clamp can automatically release the pressure through the safety valve to ensure that no damage is caused to the workpiece when clamping thin-walled pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional diagram of a push-type quick oil return structure of an electric hydraulic pliers;

[0022] Figure 2 A three-dimensional cross-sectional view of a push-type quick oil return structure of an electric hydraulic pliers;

[0023] Figure 3 A cross-sectional view of a push-type quick oil return structure of an electric hydraulic pliers;

[0024] Figure 4 for Figure 3Enlarged view of the oil return valve;

[0025] Figure 5 Schematic diagram of the oil return pressure piece involved.

[0026] In the figure: 1. Clamp head; 2. First spring; 3. Piston; 4. Hydraulic cylinder; 41. Pressure relief oil circuit; 411. Oil circuit one; 412. Oil circuit two; 413. Oil circuit three; 5. First one-way valve; 6. Second one-way valve; 7. Oil bag; 8. Plunger; 9. Motor bracket; 10. Drive shaft; 11. Drive cam; 12. Oil return valve; 121. Oil return valve seat; 1211. Through hole; 122. Oil return valve stem; 123. Valve stem spring; 124. Steel ball; 125. Holding spring; 13. Safety valve; 14. Oil plug; 15. Oil cover; 16. Oil return pressing piece; 161. Pressing part; 162. Supporting part; 163. Action part. DETAILED DESCRIPTION

[0027] like Figures 1 to 5 As shown, a push-type quick oil return structure of an electric hydraulic pliers of the present utility model embodiment includes a hydraulic cylinder body 4, the front end of the hydraulic cylinder body 4 is fixedly connected to the pliers head 1, a movable piston 3 is provided in the hydraulic cylinder body 4, a first spring 2 is arranged between the piston 3 and the pliers head 1, and the first spring 2 keeps the piston 3 moving backward; an oil bag 7 is fixedly connected to the rear end of the hydraulic cylinder body 4, and the inner cavity of the oil bag 7 is used to store oil; a plunger 8, a first one-way valve 5, and a second one-way valve 6 are all installed in the hydraulic cylinder body 4, and the reciprocating motion of the plunger 8 causes the oil to be supplied from the oil bag 7 to the hydraulic cylinder body 4 in one direction; a motor bracket 9 is fixed to the side of the hydraulic cylinder body 4, A drive shaft 10 is installed in the motor bracket 9, and a drive cam 11 is arranged on the drive shaft 10, and the drive cam 11 drives the plunger 8 to reciprocate; a pressure relief oil circuit 41 is formed on the hydraulic cylinder body 4, and the pressure relief oil circuit 41 connects the inner cavity of the hydraulic cylinder body 4 with the inner cavity of the oil bag 7, and the return oil valve 12 and the safety valve 13 are both arranged on the pressure relief oil circuit 41; the return oil pressing member 16 is provided on the motor bracket 9, and the return oil pressing member 16 includes a support portion 162 formed in the middle position as a fulcrum, a pressing portion 161 formed at one end position for pressing, and an action portion 163 formed at the other end position for interacting with the return oil valve 12.

[0028] More specifically, the oil bag 7 is provided with an oil filling hole, and an oil plug 14 is provided at the position of the oil filling hole for sealing; the rear end of the hydraulic cylinder body 4 is also provided with an oil cover 15, which covers the oil bag 7 for protection; the motor bracket 9 is provided with a motor, and a transmission connection is formed between the output shaft of the motor and the drive shaft 10; the pressure relief oil circuit 41 includes an oil circuit 1 411, an oil circuit 2 412, and an oil circuit 3 413 connected to each other, and a safety valve 13 is provided at the oil circuit 2 412 and passes through The oil circuit 1 411 is always connected to the inner cavity of the hydraulic cylinder body 4; the oil return valve 12 includes an oil return valve seat 121 fixedly installed on the hydraulic cylinder body 4, an oil return valve stem 122 and a valve stem spring 123 arranged in the oil return valve seat 121, and a through hole 1211 is processed on the oil return valve seat 121 to form a connection with the oil circuit 3 413; the oil return valve 12 also includes a steel ball 124 provided on one side of the oil return valve stem 122 and a holding spring 125 for holding the steel ball 124.

[0029] The setting of the return oil pressing piece makes the return oil pressure relief convenient and efficient, and the clamping of the electric hydraulic pliers is more convenient and more efficient. It is equipped with a safety valve. When the pressure is too high, the electric hydraulic pliers can automatically release the pressure by the safety valve to ensure that no damage is caused to the workpiece when clamping thin-walled pipe fittings.

[0030] In order to facilitate understanding of the present invention, the following description will be given in conjunction with the accompanying drawings.

[0031] The lithium battery acts as a power source to operate the motor, which, via the drive shaft 10 and the drive cam 11, causes the plunger 8 to reciprocate. This causes the oil in the oil bag 7 to flow through the second and first one-way valves 6 and 5 into the hydraulic cylinder 4. The piston 3 overcomes the elastic force of the first spring 2 and moves forward, clamping the workpiece between the piston 3 and the clamp head 1. When the pressure in the hydraulic cylinder 4 exceeds the set value, the high-pressure oil in the hydraulic cylinder 4 automatically flows back into the oil bag 7 through the second oil line 412 and the safety valve 13.

[0032] When manual pressure relief is required to release the workpiece, the pressing portion 161 is pressed so that the return oil pressing member 16 uses the support portion 162 as a lever fulcrum, and the action portion 163 contacts the return oil valve stem 122. The movement of the return oil valve stem 122 causes the steel ball 124 to move, and the holding spring 125 is compressed. In this way, the oil in the hydraulic cylinder body 4 flows back to the oil bag 7 through the oil circuit 1 411, the through hole 1211, and the oil circuit 3 413. The elastic force of the first spring 2 causes the piston 3 to move backward, and the clamped workpiece is released.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A push-type quick oil return structure for electric hydraulic pliers, characterized by: include A hydraulic cylinder (4), the front end of which is fixedly connected to a clamp head (1), a movable piston (3) is provided in the hydraulic cylinder (4), a first spring (2) is arranged between the piston (3) and the clamp head (1), and the first spring (2) enables the piston (3) to maintain a backward movement trend; An oil bag (7), the oil bag (7) being fixedly connected to the rear end of the hydraulic cylinder body (4), and the inner cavity of the oil bag (7) being used for storing oil; A plunger (8), a first one-way valve (5), and a second one-way valve (6), wherein the plunger (8), the first one-way valve (5), and the second one-way valve (6) are all installed in the hydraulic cylinder (4); the plunger (8) reciprocates to supply oil from the oil bag (7) to the hydraulic cylinder (4) in a one-way manner; A motor bracket (9), the motor bracket (9) is fixed to the side of the hydraulic cylinder body (4), a drive shaft (10) is installed in the motor bracket (9), a drive cam (11) is arranged on the drive shaft (10), and the drive cam (11) drives the plunger (8) to perform reciprocating motion; a pressure relief oil circuit (41), an oil return valve (12), and a safety valve (13); the pressure relief oil circuit (41) is formed on the hydraulic cylinder body (4); the pressure relief oil circuit (41) enables the inner cavity of the hydraulic cylinder body (4) to communicate with the inner cavity of the oil bag (7); the oil return valve (12) and the safety valve (13) are both provided on the pressure relief oil circuit (41); An oil return pressing member (16) is provided on the motor stand (9), and comprises a supporting portion (162) formed at a middle position as a fulcrum, a pressing portion (161) formed at one end position for pressing, and an acting portion (163) formed at the other end position for acting on the oil return valve (12).

2. The push-type rapid oil return structure of the electric hydraulic pliers according to claim 1, characterized in that: The oil bag (7) is provided with an oil filling hole, and an oil plug (14) for sealing is arranged at the position of the oil filling hole.

3. The push-type rapid oil return structure of the electric hydraulic pliers according to claim 2, characterized in that: An oil cover (15) is also provided at the rear end of the hydraulic cylinder body (4), and the oil cover (15) covers the oil bag (7) therein to provide protection.

4. The push-type rapid oil return structure of the electric hydraulic pliers according to claim 1, characterized in that: The motor stand (9) is provided with a motor, and a transmission connection is formed between the output shaft of the motor and the drive shaft (10).

5. The push-type rapid oil return structure of the electric hydraulic pliers according to claim 1, characterized in that: The pressure relief oil circuit (41) includes an oil circuit 1 (411), an oil circuit 2 (412), and an oil circuit 3 (413) that are connected to each other. The safety valve (13) is arranged at the oil circuit 2 (412) and is always connected to the inner cavity of the hydraulic cylinder body (4) via the oil circuit 1 (411).

6. The push-type rapid oil return structure of the electric hydraulic pliers according to claim 5, characterized in that: The oil return valve (12) includes an oil return valve seat (121) fixedly mounted on the hydraulic cylinder body (4), an oil return valve stem (122) and a valve stem spring (123) disposed in the oil return valve seat (121), and a through hole (1211) is machined on the oil return valve seat (121) to form a communication with the oil circuit 3 (413).

7. The push-type rapid oil return structure of the electric hydraulic pliers according to claim 6, characterized in that: The oil return valve (12) further includes a steel ball (124) provided on one side of the oil return valve stem (122) and a holding spring (125) for holding the steel ball (124).

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