Electric hydraulic pliers

Abstract

The application discloses an electric hydraulic clamp, which comprises an oil pump base, an oil bag and a pressure relief valve assembly. The oil pump base is provided with an oil outlet channel and a first pressure relief channel. The oil bag is used for storing pressure oil. The pressure relief valve assembly is arranged on the oil pump base and is used for realizing automatic pressure relief. The pressure relief valve assembly comprises a pressure relief valve seat, a pressure relief valve piston, a plunger and a pressure relief elastic member. The pressure relief valve seat is arranged on the oil pump base. The pressure relief valve seat is provided with a pressure relief port which is communicated with the oil outlet channel. The pressure relief valve piston is movably arranged on the oil pump base and is used for moving along the axial direction of the pressure relief valve seat. The plunger is arranged on the pressure relief valve piston and is used for plugging the pressure relief port. The pressure relief elastic member is abutted between the pressure relief valve piston and the oil pump base and is used for providing an elastic force to the pressure relief valve piston, so that the plunger has a tendency of being close to the pressure relief port. The electric hydraulic clamp has high automation degree, can realize the functions of full-automatic pressure relief and reset, can protect internal sealing devices and the like, and prolongs the overall service life of the electric hydraulic clamp.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic pliers, and in particular to an electric hydraulic pliers. Background Art

[0002] Currently, electric hydraulic pliers typically consist of a motor, an oil reservoir, a hydraulic pump, a hydraulic cylinder, a switch assembly, and a control valve. The hydraulic cylinder is equipped with a return spring and a piston rod, the outer end of which is fixedly connected to a working end. When the electric hydraulic pliers are in operation, the motor drives the hydraulic pump, forcing pressurized oil from the oil reservoir into the hydraulic cylinder, pushing the hydraulic working end into operation. To deactivate the hydraulic working end, the switch assembly is closed, deactivating the motor, and the oil drain port is opened. The return spring then forces the pressurized oil back into the oil reservoir.

[0003] Existing electric hydraulic pliers have a reset knob on top. When the hydraulic pliers reach their maximum travel, the motor's start switch is released, and then the reset knob is manually turned to open the oil unloading channel and reset the hydraulic pliers. However, hydraulic pliers with this structure can only achieve a semi-automatic reset function. If the operator does not release the motor switch after the hydraulic pliers reach their maximum load or maximum allowable pressure, it can easily damage the entire hydraulic system, causing damage and leakage of internal components and pipelines (such as seals), reducing transmission stability, increasing the frequency of subsequent leakage, significantly shortening service life, and creating safety hazards. Therefore, it is necessary for those skilled in the art to provide an electric hydraulic pliers that can automatically release pressure and reset. Summary of the Invention

[0004] The purpose of this application is to provide an electric hydraulic pliers that can achieve automatic pressure relief, thereby protecting internal seals and other components and extending the service life of the equipment.

[0005] To achieve the above objectives, the present application provides an electric hydraulic pliers, comprising:

[0006] An oil pump seat is provided with an oil outlet channel and a first pressure relief channel;

[0007] an oil bag connected to the oil pump seat and in communication with the first pressure relief channel for storing pressurized oil;

[0008] The pressure relief valve assembly is provided on the oil pump seat and is used to relieve the pressure of the oil in the oil outlet channel when the pressure reaches a preset pressure value, so that the pressure oil in the oil outlet channel flows into the oil bag through the first pressure relief channel. It includes:

[0009] The pressure relief valve seat is located on the oil pump seat and is connected to the oil outlet channel.

[0010] Open pressure relief port;

[0011] The pressure relief valve piston is movably arranged on the oil pump seat and is used to move along the axis of the pressure relief valve seat.

[0012] Linear movement, and is used to block the first pressure relief channel;

[0013] The ejector pin is located on the piston of the pressure relief valve and is used to block the pressure relief port to prevent the pressure oil from

[0014] Flow out from the pressure relief port;

[0015] The pressure relief elastic member is in contact between the pressure relief valve piston and the oil pump seat, and is used to provide elastic force to the pressure relief valve piston so that the ejector pin tends to approach the pressure relief port.

[0016] In some embodiments, a pressure regulating structure is also included, which includes an adjusting seat. The adjusting seat is rotatably provided on the oil pump seat and abuts against the pressure relief elastic member. The adjusting seat is used to rotate along the axial direction of the pressure relief valve seat to adjust the elastic force of the pressure relief elastic member.

[0017] In some embodiments, the pressure regulating structure further includes a valve needle, which passes through the pressure relief valve piston and the regulating seat. The pressure relief elastic member is sleeved on the valve needle, and the ejector pin is arranged at one end of the valve needle away from the regulating seat.

[0018] In some embodiments, further comprising:

[0019] The pump body is connected to the oil pump seat and is provided with an oil inlet hole;

[0020] The oil pump piston structure is movably provided on the pump body and is used to move along the axis of the pump body to draw oil from the oil bag through the oil inlet hole, including:

[0021] Oil pump piston sleeve;

[0022] The oil pump piston rod is connected to the oil pump piston sleeve and is used to drive the oil pump piston sleeve to move along the axis of the pump body;

[0023] The oil pump elastic member is in contact between the oil pump piston sleeve and the pump body, and is used to provide elastic force to the oil pump piston sleeve so that the oil pump piston sleeve tends to move away from the pressure relief valve assembly.

[0024] In some embodiments, further comprising:

[0025] Cover body, connected to the oil pump piston rod;

[0026] The core shaft is connected to the cover body and is used for mounting the elastic part of the oil pump.

[0027] In some embodiments, a power drive assembly is further included, which is used to drive the oil pump piston rod to reciprocate along the axis of the pump body. The power drive assembly includes:

[0028] Power eccentric wheel, connected to the oil pump piston rod;

[0029] A power eccentric shaft connected to a power eccentric wheel;

[0030] The power driving member is connected to the power eccentric shaft and is used to drive the power eccentric shaft to rotate along the axial direction to drive the oil pump piston rod to move.

[0031] In some embodiments, an oil suction valve assembly is further included. The oil suction valve assembly is arranged on the pump body in a direction perpendicular to the axis of the pump body. The oil suction valve assembly includes:

[0032] The oil suction valve ball is used to block the oil inlet hole;

[0033] The oil suction valve seat is located on the pump body;

[0034] The oil suction valve elastic member is in contact between the oil suction valve seat and the oil suction valve ball, and is used to provide elastic force to the oil suction valve ball so that the oil suction valve ball tends to approach the oil inlet hole.

[0035] In some embodiments, the pump body is further provided with an oil outlet hole, which is connected to the oil inlet hole. The electric hydraulic pliers further include an oil outlet valve assembly, which is provided on the pump body and is coaxially arranged with the pump body. The oil outlet valve assembly includes:

[0036] The oil outlet valve ball is used to seal the oil outlet hole;

[0037] The oil outlet valve seat is provided on the pump body and is provided with a through hole;

[0038] The oil outlet valve elastic member is in contact between the oil outlet valve seat and the oil outlet valve ball, and is used to provide elastic force to the oil outlet valve ball so that the oil outlet valve ball tends to approach the oil outlet hole.

[0039] In some embodiments, the oil pump base is further provided with an oil unloading port and a second pressure relief channel, the oil unloading port is communicated with the oil outlet channel and the second pressure relief channel, and the second pressure relief channel is communicated with the oil bag. The electric hydraulic pliers further include a manual pressure relief structure, which is provided on the oil pump base and is used to supply the pressurized oil in the oil outlet channel to flow into the oil bag through the oil unloading port and the second pressure relief channel. The manual pressure relief structure includes:

[0040] Pressure relief ball, used to seal the oil unloading port;

[0041] The rotating pressure relief member is rotatably arranged on the oil pump seat and abuts against the pressure relief ball. It is used to rotate along the axis direction of the oil discharge port to tighten or loosen the pressure relief ball.

[0042] In some embodiments, a knob is provided on the rotating pressure relief member, a first cotter pin is provided on the knob, and a second cotter pin is provided on the oil pump seat, and the first cotter pin contacts and abuts against the second cotter pin to limit the rotation of the knob.

[0043] Compared with the above-mentioned background technology, the electric hydraulic pliers provided in the embodiment of the present application include an oil pump seat, an oil bag and a pressure relief valve assembly, wherein the oil pump seat is provided with an oil outlet channel and a first pressure relief channel, the oil bag is connected to the oil pump seat, the oil bag is communicated with the first pressure relief channel, the oil bag is used to store pressurized oil, and the pressure relief valve assembly is provided on the oil pump seat. The pressure relief valve assembly is used to realize automatic pressure relief when the pressure oil in the oil outlet channel reaches a preset pressure value, thereby allowing the pressure oil in the oil outlet channel to flow into the oil bag through the first pressure relief channel. Furthermore, the pressure relief valve assembly includes a pressure relief valve seat, a pressure relief valve piston, a ejector pin and a pressure relief elastic member, wherein the pressure relief valve seat is arranged on the oil pump seat, the pressure relief valve seat is provided with a pressure relief port connected to the oil outlet channel, the pressure relief valve piston is movably arranged on the oil pump seat, the pressure relief valve piston is used to move along the axial direction of the pressure relief valve seat, and at the same time, the pressure relief valve piston is used to block the first pressure relief channel, the ejector pin is arranged on the pressure relief valve piston, the ejector pin is used to block the pressure relief port to prevent the pressurized oil from flowing out of the pressure relief port, the pressure relief elastic member abuts between the pressure relief valve piston and the oil pump seat, the pressure relief elastic member is used to provide elastic force to the pressure relief valve piston, so that the ejector pin has a tendency to approach the pressure relief port.

[0044] In this way, when the oil pressure of the pressure oil in the oil outlet channel does not reach the threshold value (preset pressure value), under the action of the pressure relief elastic member, the ejector pin is pressed against the pressure relief port on the valve seat of the pressure relief valve, and the pressure relief valve piston blocks the first pressure relief channel. At this time, the pressure oil cannot flow out from the pressure relief port and the first pressure relief channel; when the oil pressure reaches the threshold value, the pressure oil will squeeze the ejector pin, and the pressure of the pressure oil will overcome the elastic force of the pressure relief elastic member, thereby squeezing the ejector pin open, and the pressure relief valve piston will move downward, and the pressure relief port and the first pressure relief channel will be opened at the same time. At this time, the pressure oil in the oil outlet channel returns to the oil bag through the pressure relief port and the first pressure relief channel, thereby realizing self-reset of the working end. Compared with traditional electric hydraulic pliers, the electric hydraulic pliers provided in the embodiment of the present application have a high degree of automation and can realize the functions of fully automatic pressure relief and reset. That is, once the oil pressure of the pressure oil in the oil outlet channel reaches the threshold, the pressure can be automatically relieved. The operation is convenient and avoids the situation where the hydraulic pliers are often close to or exceed the maximum allowable pressure due to improper operation of the staff during work, and ultimately the internal structure is damaged due to excessive oil pressure. This can protect internal seals and other components and extend the overall service life of the electric hydraulic pliers. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0046] Figure 1 This is a schematic diagram of the structure of the electric hydraulic pliers in an embodiment of the present application.

[0047] in:

[0048] 1-power drive assembly 1, 11-power drive member, 12-power eccentric shaft, 13-power eccentric wheel;

[0049] 2-oil pump piston structure, 21-oil pump piston rod, 22-oil pump piston sleeve, 23-oil pump elastic member, 24-cover body, 25-core shaft;

[0050] 3- pump body, 31- oil inlet hole, 32- oil outlet hole;

[0051] 4-oil suction valve assembly, 41-oil suction valve seat, 42-oil suction valve elastic member, 43-oil suction valve ball;

[0052] 5-oil outlet valve assembly, 51-oil outlet valve seat, 52-oil outlet valve elastic member, 53-oil outlet valve ball;

[0053] 6-Oil bag;

[0054] 7- oil pump seat, 71- oil outlet channel, 72- first pressure relief channel, 73- oil unloading port, 74- second pressure relief channel;

[0055] 8-pressure relief valve assembly, 81-pressure relief valve seat, 82-thimble, 83-pressure relief valve piston, 84-pressure relief elastic member, 85-pressure regulating structure, 851-adjusting seat, 852-valve needle;

[0056] 9-manual pressure relief structure, 91-pressure relief ball, 92-rotating pressure relief member, 93-knob, 94-first cotter pin, 95-second cotter pin;

[0057] 10-Big piston. DETAILED DESCRIPTION

[0058] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0059] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0060] It should be noted that the directional terms such as "upper end, lower end, left side, right side" described below are all defined based on the drawings in the specification.

[0061] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of the electric hydraulic pliers in an embodiment of the present application.

[0062] like Figure 1 As shown, the electric hydraulic pliers provided by the embodiment of the present application include, from left to right, an oil pump piston structure 2, an oil bag 6, an oil pump seat 7, and a large piston 10 for output. The reciprocating motion of the oil pump piston structure 2 pumps oil from the oil bag 6, and then the pumped-out pressurized oil is transported through the oil pump seat 7 toward the large piston 10, thereby pushing the large piston 10 out.

[0063] In order to achieve automatic pressure relief, the electric hydraulic pliers also include a pressure relief valve assembly 8, wherein the oil pump seat 7 is provided with an oil outlet channel 71 and a first pressure relief channel 72, the oil bag 6 is connected to the oil pump seat 7, the oil bag 6 is communicated with the first pressure relief channel 72, the oil bag 6 is used to store pressurized oil, and the pressure relief valve assembly 8 is provided on the oil pump seat 7. The pressure relief valve assembly 8 is used to achieve automatic pressure relief when the pressure oil in the oil outlet channel 71 reaches a preset pressure value, thereby allowing the pressure oil in the oil outlet channel 71 to flow into the oil bag 6 through the first pressure relief channel 72.

[0064] Furthermore, the pressure relief valve assembly 8 includes a pressure relief valve seat 81, a pressure relief valve piston 83, a ejector pin 82 and a pressure relief elastic member 84, wherein the head of the pressure relief valve seat 81 is fixedly mounted on the oil pump seat 7 by means of threads, the pressure relief valve seat 81 is provided with a pressure relief port connected to the oil outlet channel 71, the pressure relief valve piston 83 is movably provided on the oil pump seat 7, the pressure relief valve piston 83 is used to move along the axial direction of the pressure relief valve seat 81, and at the same time, the pressure relief valve piston 83 is used to block the first pressure relief channel 72, the ejector pin 82 is provided on the pressure relief valve piston 83, the ejector pin 82 is used to block the pressure relief port to prevent the pressurized oil from flowing out of the pressure relief port, the pressure relief elastic member 84 abuts between the pressure relief valve piston 83 and the oil pump seat 7, the pressure relief elastic member 84 is used to provide elastic force to the pressure relief valve piston 83, so that the ejector pin 82 has a tendency to approach the pressure relief port.

[0065] In this way, when the oil pressure of the pressure oil in the oil outlet channel 71 does not reach the threshold value (preset pressure value), under the action of the pressure relief elastic member 84, the ejector pin 82 is pressed against the pressure relief port on the pressure relief valve seat 81, and the pressure relief valve piston 83 blocks the first pressure relief channel 72. At this time, the pressure oil cannot flow out from the pressure relief port and the first pressure relief channel 72; when the oil pressure reaches the threshold value, the pressure oil will squeeze the ejector pin 82, and the pressure of the pressure oil will overcome the elastic force of the pressure relief elastic member 84, thereby squeezing the ejector pin 82 open, and the pressure relief valve piston 83 will move downward, and the pressure relief port and the first pressure relief channel 72 will be opened at the same time. At this time, the pressure oil in the oil outlet channel 71 returns to the oil bag 6 through the pressure relief port and the first pressure relief channel 72, thereby realizing self-reset of the working end.

[0066] Compared with traditional electric hydraulic pliers, the electric hydraulic pliers provided in the embodiment of the present application have a high degree of automation and can realize the functions of fully automatic pressure relief and reset. That is, once the oil pressure of the pressure oil in the oil outlet channel 71 reaches the threshold, the pressure can be automatically relieved. The operation is convenient and avoids the situation where the hydraulic pliers are often close to or exceed the maximum allowable pressure due to improper operation of the staff during work, and ultimately the internal structure is damaged due to excessive oil pressure. This can protect internal seals and other components and extend the overall service life of the electric hydraulic pliers.

[0067] In different usage scenarios, in order to crimp different products or make products with different pressure specifications, a pressure regulating structure 85 can be designed at the bottom of the pressure relief valve assembly 8. The pressure regulating structure 85 includes an adjusting seat 851, wherein the adjusting seat 851 is rotatably provided on the oil pump seat 7, and the adjusting seat 851 abuts against the pressure relief elastic member 84. The adjusting seat 851 is used to rotate along the axial direction of the pressure relief valve seat 81 to adjust the elastic force of the pressure relief elastic member 84. In this way, by rotating the adjusting seat 851 to adjust the deformation of the pressure relief elastic member 84, the threshold value of the oil unloading pressure is changed, thereby realizing the automatic pressure relief function of different oil pressures.

[0068] In some embodiments, the pressure regulating structure 85 further includes a valve needle 852 , which passes through the pressure relief valve piston 83 and the regulating seat 851 , the pressure relief elastic member 84 is sleeved on the valve needle 852 , and the ejector pin 82 is disposed at one end of the valve needle 852 away from the regulating seat 851 .

[0069] Specifically, valve needle 852 comprises a valve head and a stem. The pressure relief valve piston 83 is provided with a receiving groove for accommodating the valve head. The stem passes through the pressure relief valve piston 83 and the adjustment seat 851. The pressure relief elastic member 84 is sleeved on the stem. The stem guides the pressure relief elastic member 84, ensuring that it deforms along the axis of the stem, preventing it from tilting during deformation and affecting the pressure relief function. Furthermore, to ensure sealing, a sealing ring is provided between the stem and the adjustment seat 851.

[0070] The setting of the pressure regulating structure 85 can adjust the pressure relief pressure of the electric hydraulic pliers according to the working conditions, use environment and component performance.

[0071] In some embodiments, the electric hydraulic pliers further include a pump body 3 , which is connected to an oil pump seat 7 , and is provided with an oil inlet hole 31 .

[0072] It should be noted that the oil pump piston structure 2 is movably provided on the pump body 3, and the oil pump piston structure 2 is used to move along the axial direction of the pump body 3 to draw oil from the oil bag 6 through the oil inlet hole 31. Specifically, the oil pump piston structure 2 includes an oil pump piston sleeve 22, an oil pump piston rod 21 and an oil pump elastic member 23, wherein the oil pump piston sleeve 22 is provided in a built-in groove of the pump body 3, the oil pump piston rod 21 is connected to the oil pump piston sleeve 22, the oil pump piston rod 21 is used to drive the oil pump piston sleeve 22 to move along the axial direction of the pump body 3, the oil pump elastic member 23 abuts between the oil pump piston sleeve 22 and the pump body 3, and the oil pump elastic member 23 is used to provide elastic force to the oil pump piston sleeve 22, so that the oil pump piston sleeve 22 has a tendency to move away from the pressure relief valve assembly 8.

[0073] In some embodiments, because the oil pump elastic member 23 is large, has a long stroke, and changes rapidly, the electric hydraulic pliers further include a cover 24 and a core shaft 25. The cover 24 is connected to the oil pump piston rod 21, and the core shaft 25 is connected to the cover 24. The core shaft 25 is used to fit the oil pump elastic member 23 and serves as a guide. In other words, inserting the core shaft 25 in this location can reduce deformation of the oil pump elastic member 23 during operation and extend its service life.

[0074] In some embodiments, the electric hydraulic pliers further include a power drive assembly 1, which is used to drive the oil pump piston rod 21 to reciprocate along the axial direction of the pump body 3. The power drive assembly 1 includes a power eccentric wheel 13, a power eccentric shaft 12, and a power drive member 11, wherein the power eccentric wheel 13 is connected to the oil pump piston rod 21, the power eccentric shaft 12 is connected to the power eccentric wheel 13, and the power drive member 11 is connected to the power eccentric shaft 12. The power drive member 11 is used to drive the power eccentric shaft 12 to rotate along the axial direction to drive the oil pump piston rod 21 to move. Of course, the power drive member 11 is a motor, and the output shaft of the motor is connected to the power eccentric shaft 12.

[0075] It should be noted that the above structure is similar to an electric hammer, connecting the motor output shaft to the power eccentric shaft 12, and then connecting and cooperating the power eccentric wheel 13 with the oil pump piston rod 21 to achieve pressurization. In this way, the rotation of the power eccentric wheel 13 drives the oil pump piston rod 21 to reciprocate. Under the action of the oil pump elastic member 23, the oil pump piston rod 21 automatically resets and pumps oil from the oil bag 6 through the oil inlet hole 31. The extracted pressurized oil is then sent to the large piston 10 to push the large piston 10 out.

[0076] In some embodiments, the electro-hydraulic tong further comprises an oil suction valve assembly 4 arranged on the pump body 3 in a direction perpendicular to the axis of the pump body 3, the oil suction valve assembly 4 comprising an oil suction valve ball 43, an oil suction valve seat 41 and an oil suction valve spring 42, wherein the oil suction valve ball 43 is used to block the oil inlet hole 31, the oil suction valve seat 41 is threadedly connected to the pump body 3, the oil suction valve spring 42 is arranged between the oil suction valve seat 41 and the oil suction valve ball 43, and the oil suction valve spring 42 is used to provide an elastic force to the oil suction valve ball 43, so that the oil suction valve ball 43 has a tendency to be close to the oil inlet hole 31.

[0077] In some embodiments, the pump body 3 is further provided with an oil outlet hole 32 communicating with the oil inlet hole 31, and the electro-hydraulic tong further comprises an oil outlet valve assembly 5 arranged on the pump body 3 and coaxially arranged with the pump body 3, the oil outlet valve assembly 5 comprising an oil outlet valve ball 53, an oil outlet valve seat 51 and an oil outlet valve spring 52, wherein the oil outlet valve ball 53 is used to block the oil outlet hole 32, the oil outlet valve seat 51 is threadedly connected to the pump body 3, the oil outlet valve seat 51 is provided with a through hole communicating with the oil outlet hole 32, the oil outlet valve spring 52 is arranged in the through hole together with the oil outlet valve ball 53, the oil outlet valve spring 52 is arranged between the oil outlet valve seat 51 and the oil outlet valve ball 53, and the oil outlet valve spring 52 is used to provide an elastic force to the oil outlet valve ball 53, so that the oil outlet valve ball 53 has a tendency to be close to the oil outlet hole 32.

[0078] It should be noted that the above-mentioned pressure relief spring 84, oil pump spring 23, oil suction valve spring 42 and oil outlet valve spring 52 are all spring structures.

[0079] In this way, through the rotation of the power eccentric wheel 13, the oil pump piston rod 21 is driven to reciprocate, and under the action of the oil pump spring 23, the oil pump piston rod 21 is automatically reset and draws oil from the oil bag 6, and then injects the drawn pressure oil in the direction of the oil outlet valve assembly 5, extrudes the oil outlet valve ball 53 and the oil outlet valve spring 52, and sends the pressure oil to the large piston 10 through the through hole on the oil outlet valve spring seat, and pushes the large piston 10 out.

[0080] When oil is injected, the oil suction valve ball 43 is pushed against the oil inlet hole 31 by oil pressure to prevent backflow of hydraulic oil. In the static state, the oil suction valve seat 41, the oil suction valve spring 42 and the oil suction valve ball 43 thereat, and the oil outlet valve seat 51, the oil outlet valve spring 52 and the oil outlet valve ball 53 thereat, respectively block the oil inlet hole 31 and the oil outlet hole 32 to avoid oil leakage.

[0081] In some embodiments, the oil pump seat 7 is further provided with an oil unloading port 73 and a second pressure relief channel 74. The oil unloading port 73 is connected to the oil outlet channel 71 and the second pressure relief channel 74, and the second pressure relief channel 74 is connected to the oil bag 6. The electric hydraulic pliers also include a manual pressure relief structure 9. The manual pressure relief structure 9 is provided on the oil pump seat 7. The manual pressure relief structure 9 and the pressure relief valve assembly 8 are respectively provided on the upper and lower sides of the oil outlet channel 71. The manual pressure relief structure 9 is used to supply the pressure oil in the oil outlet channel 71 to flow into the oil bag 6 through the oil unloading port 73 and the second pressure relief channel 74.

[0082] Specifically, the manual pressure relief structure 9 includes a pressure relief ball 91 and a rotating pressure relief part 92, wherein the pressure relief ball 91 is used to seal the oil unloading port 73, and the rotating pressure relief part 92 is rotatably provided on the oil pump seat 7, and the rotating pressure relief part 92 abuts against the pressure relief ball 91. The rotating pressure relief part 92 is used to rotate along the axial direction of the oil unloading port 73 to tighten or loosen the pressure relief ball 91.

[0083] The provision of the manual pressure relief structure 9 enables the electric hydraulic pliers to have a manual pressure relief and reset function, thereby enabling manual reset during operation.

[0084] Of course, according to actual needs, the rotating pressure relief member 92 can be a pressure relief screw, which blocks the oil unloading port 73 through the pressure relief ball 91. Since the pressure relief screw is threadedly connected to the connecting hole on the oil pump seat 7, it has a self-locking state under the action of oil pressure. Therefore, without human intervention, the hydraulic oil cannot flow back from this place.

[0085] When resetting is required during pressurization, the operator turns the pressure relief screw to loosen the pressure relief ball 91, and the hydraulic oil can flow back from the oil unloading port 73, and then the pressure relief screw will slowly reset under the action of the negative pressure.

[0086] In some embodiments, a knob 93 is provided on the rotating pressure relief member 92, a first cotter pin 94 is provided on the knob 93, and a second cotter pin 95 is provided on the oil pump seat 7. The first cotter pin 94 and the second cotter pin 95 are in contact and abutment with each other to limit the rotation of the knob 93.

[0087] That is to say, by providing two cotter pins that can interfere with each other, it is possible to prevent the knob 93 from rotating at an excessive angle, thereby preventing the pressure relief screw from loosening.

[0088] It should be noted that the contact parts of each component of the electric hydraulic pliers are equipped with sealing structures, including but not limited to O-rings, gaskets, etc., to ensure the sealing of the internal structure of the electric hydraulic pliers, improve safety of use, and extend service life.

[0089] In summary, the electric hydraulic clamp provided by the embodiment of the application has two functions of automatic reset and manual reset during pressure increase, and the two functions do not interfere with each other, so that the electric hydraulic clamp can be automatically reset after reaching the set maximum pressure, the internal components are protected, and the degree of automation is improved. At the same time, the electric hydraulic clamp can be manually reset during pressure increase, and in the event of improper operation or other unexpected situations, the electric hydraulic clamp can be timely stopped to reduce losses, and the electric hydraulic clamp is more flexible to use.

[0090] It should be noted that the relational terms herein such as first and second, and the like, are used solely to distinguish one entity from another, without necessarily requiring or implying any actual relationship or order between or among the entities.

[0091] The electric hydraulic clamp provided by the application is described in detail above. The principles and implementation modes of the application are described by applying specific examples in this paper, and the above description of the embodiments is only used to help understand the scheme of the application and its core idea. It should be pointed out that for ordinary skilled persons in the art, some improvements and modifications can be made to the application without departing from the principles of the application, and these improvements and modifications also fall within the protection scope of the claims of the application.

Claims

1. An electric hydraulic pliers, characterized in that: include: An oil pump seat, wherein the oil pump seat is provided with an oil outlet channel and a first pressure relief channel; an oil bag connected to the oil pump seat and in communication with the first pressure relief channel, for storing pressurized oil; A pressure relief valve assembly is provided on the oil pump seat and is used to relieve pressure when the pressure oil in the oil outlet channel reaches a preset pressure value, so that the pressure oil in the oil outlet channel flows into the oil bag through the first pressure relief channel, comprising: A pressure relief valve seat is provided on the oil pump seat, and the pressure relief valve seat is provided with a pressure relief port communicated with the oil outlet channel; a pressure relief valve piston, movably disposed on the oil pump seat, adapted to move along the axis of the pressure relief valve seat and to block the first pressure relief passage; an ejector pin, provided on the pressure relief valve piston, for blocking the pressure relief port to prevent the pressure oil from flowing out of the pressure relief port; a pressure relief elastic member, abutting between the pressure relief valve piston and the oil pump seat, and used for providing elastic force to the pressure relief valve piston so that the ejector pin tends to approach the pressure relief port; The electric hydraulic pliers further include a pressure regulating structure, the pressure regulating structure including an adjusting seat, the adjusting seat being rotatably disposed on the oil pump seat, the adjusting seat abutting against the pressure relief elastic member, and the adjusting seat being configured to rotate along the axis of the pressure relief valve seat to adjust the elastic force of the pressure relief elastic member; The pressure regulating structure further includes a valve needle, which passes through the pressure relief valve piston and the regulating seat, the pressure relief elastic member is sleeved on the valve needle, and the ejector pin is provided at one end of the valve needle away from the regulating seat; The valve needle includes a valve head and a rod. The pressure relief valve piston is provided with a receiving groove for accommodating the valve head. The rod passes through the pressure relief valve piston and the adjustment seat. The pressure relief elastic member is sleeved on the rod. The rod can guide the pressure relief elastic member to ensure that the pressure relief elastic member can deform along the axial direction of the rod, thereby preventing the pressure relief elastic member from tilting during deformation and affecting the pressure relief function. A sealing ring is provided between the rod and the adjustment seat. The oil pump seat is further provided with an oil unloading port and a second pressure relief channel, the oil unloading port is in communication with the oil outlet channel and the second pressure relief channel, and the second pressure relief channel is in communication with the oil bag. The electric hydraulic pliers further include a manual pressure relief structure, which is provided on the oil pump seat and is used to allow the pressurized oil in the oil outlet channel to flow into the oil bag through the oil unloading port and the second pressure relief channel. The manual pressure relief structure includes: A pressure relief ball, used for blocking the oil unloading port; a rotating pressure relief member rotatably disposed on the oil pump seat and abutting against the pressure relief ball, and configured to rotate along the axis of the oil discharge port to compress or loosen the pressure relief ball; The rotary pressure relief member is provided with a knob, the knob is provided with a first cotter pin, and the oil pump seat is provided with a second cotter pin. The first cotter pin and the second cotter pin contact and abut against each other to limit the rotation of the knob.

2. The electric hydraulic pliers according to claim 1, characterized in that: Also includes: A pump body connected to the oil pump seat, the pump body being provided with an oil inlet hole; An oil pump piston structure is movably provided on the pump body and is used to move along the axial direction of the pump body to pump oil from the oil bag through the oil inlet hole, comprising: Oil pump piston sleeve; An oil pump piston rod connected to the oil pump piston sleeve and used to drive the oil pump piston sleeve to move along the axis of the pump body; The oil pump elastic member is in contact between the oil pump piston sleeve and the pump body, and is used to provide elastic force to the oil pump piston sleeve so that the oil pump piston sleeve tends to move away from the pressure relief valve assembly.

3. The electric hydraulic pliers according to claim 2, characterized in that: Also includes: a cover body connected to the oil pump piston rod; The core shaft is connected to the cover body and is used for the oil pump elastic member to be sleeved.

4. The electric hydraulic pliers according to claim 2, characterized in that: It also includes a power drive assembly, which is used to drive the oil pump piston rod to reciprocate along the axis of the pump body. The power drive assembly includes: A power eccentric wheel connected to the oil pump piston rod; A power eccentric shaft connected to the power eccentric wheel; The power driving member is connected to the power eccentric shaft and is used to drive the power eccentric shaft to rotate along the axial direction to drive the oil pump piston rod to move.

5. The electric hydraulic pliers according to claim 2, characterized in that: It also includes an oil suction valve assembly, which is arranged on the pump body in a direction perpendicular to the axis of the pump body, and the oil suction valve assembly includes: An oil suction valve ball, used for blocking the oil inlet hole; An oil suction valve seat is provided on the pump body; The oil suction valve elastic member is in contact between the oil suction valve seat and the oil suction valve ball, and is used to provide elastic force to the oil suction valve ball so that the oil suction valve ball tends to approach the oil inlet hole.

6. The electric hydraulic pliers according to claim 2, characterized in that: The pump body is further provided with an oil outlet hole, which is communicated with the oil inlet hole. The electric hydraulic pliers further include an oil outlet valve assembly, which is provided on the pump body and coaxially arranged with the pump body. The oil outlet valve assembly includes: An oil outlet valve ball, used for sealing the oil outlet hole; An oil outlet valve seat is provided on the pump body, and the oil outlet valve seat is provided with a through hole; The oil outlet valve elastic member is in contact between the oil outlet valve seat and the oil outlet valve ball, and is used to provide elastic force to the oil outlet valve ball so that the oil outlet valve ball tends to approach the oil outlet hole.

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