Electric hydraulic clamp with overload protection function

Abstract

This invention belongs to the field of electro-hydraulic tool technology, specifically referring to an electro-hydraulic clamp with overload protection function. It includes a body, a drive assembly, a pump body, a cylinder body, and a crimping assembly. The cylinder body and the rear end of the pump body are connected to form an oil storage chamber. An oil inlet channel and a piston chamber are opened within the pump body. A push block, linked to the crimping assembly, is sealed and slidably installed within the piston chamber. An inlet check valve and an outlet check valve are respectively installed between the oil inlet channel and the oil storage chamber and the piston chamber. The drive assembly can drive the piston rod within the pump body to reciprocate axially along the oil inlet channel, realizing continuous pumping of hydraulic oil. A return oil channel connecting the piston chamber and the oil storage chamber is provided within the pump body. A hydraulic overload protection check valve is installed in the return oil channel, which can conduct pressure relief when the hydraulic pressure in the piston chamber exceeds a preset safety threshold, fundamentally preventing equipment damage and workpiece scrap caused by overpressure operation, significantly extending equipment service life, reducing maintenance costs, ensuring stable and reliable crimping operation, and facilitating convenient operation.

Description

Technical Field

[0001] This invention belongs to the field of electro-hydraulic tool technology, and specifically refers to an electro-hydraulic clamp with overload protection function. Background Technology

[0002] Hydraulic crimping pliers are core tools used in the power, communications, and hardware processing industries for crimping cables, terminals, and metal parts. They achieve cold-pressing connections by using hydraulic power to drive the clamps to close. Currently, most commercially available electric hydraulic crimping pliers use a basic structure of motor drive + hydraulic pump body. The motor drives the hydraulic pump to apply pressure, replacing the repetitive manual operation of traditional manual hydraulic pliers and improving crimping efficiency to some extent. However, long-term engineering applications and market research have revealed that most mainstream electric hydraulic pliers on the market generally lack dedicated overload protection devices adapted to hydraulic systems, resulting in a serious deficiency in core safety protection. The technical defects and safety hazards exposed in actual operation are as follows: the equipment is prone to fatal damage, its service life is significantly shortened, and maintenance costs remain high. The drive motor of the electric hydraulic pliers has a fixed rated pressure and load limit. Continuous overpressure operation without overload protection will directly lead to drive motor stalling, winding overheating and burnout, directly causing the entire machine to be scrapped. In outdoor high-altitude and remote construction site scenarios, equipment failures not only cause construction interruptions and affect project progress, but also generate high equipment repair and replacement costs, failing to meet the long-term stable use requirements of engineering construction. In addition, electric hydraulic clamps without dedicated hydraulic overload protection are also prone to overpressure crimping problems: at best, they can cause terminal crushing and deformation, and cable core wire compression and breakage, leading to scrapping of crimping parts and increased rework rates; at worst, they can cause the electrical connection to fail to meet the conductivity and mechanical strength standards, creating major safety hazards such as joint overheating, wire breakage, and short circuits for the long-term operation of the power grid and equipment. Summary of the Invention

[0003] The purpose of this invention is to overcome the core defects of existing electric hydraulic clamps, such as the lack of dedicated hydraulic overload protection devices, easy overpressure damage, short service life, and high maintenance costs. This invention provides an electric hydraulic clamp with overload protection function. By incorporating a dedicated overload protection structure adapted to the hydraulic system, it avoids equipment damage caused by overpressure operations from the root, reduces maintenance costs, ensures stable and reliable crimping operations, guarantees the completion of crimping operations in one go, and reduces the scrap rate of workpieces.

[0004] The objective of this invention is achieved as follows: An electric hydraulic clamp with overload protection function includes a body, a drive assembly, a pump body, a cylinder body, and a crimping assembly. The crimping assembly includes a mounting base connected to the front end of the pump body, a fixed chuck fixedly mounted on the mounting base, and a movable chuck slidably mounted on the mounting base. A clamping cavity is formed between the fixed chuck and the movable chuck. The cylinder body is connected to the rear end of the pump body and has an internal oil storage chamber for storing hydraulic oil. The pump body has an oil inlet channel and a piston chamber inside. A push block is slidably and sealed inside the piston chamber. The push block is fixedly connected to a movable clamp on the mounting base. Driving the push block to slide can drive the movable clamp to move towards the fixed clamp. An oil inlet check valve is provided between the oil inlet channel and the oil storage chamber to restrict hydraulic oil to flow into the oil inlet channel only from the oil storage chamber. An oil outlet check valve is provided between the oil inlet channel and the piston chamber to restrict hydraulic oil to flow into the piston chamber only from the oil inlet channel. The drive assembly is located inside the machine body, and a piston rod is slidably arranged inside the pump body. Part of the piston rod is located in the oil inlet channel, and the lower end of the piston rod is connected to the drive assembly for transmission. The drive assembly can drive the piston rod to perform reciprocating linear motion up and down along the axial direction of the oil inlet channel. The drive assembly includes a drive motor, an eccentric shaft connected to the drive motor, a drive bearing sleeved on the eccentric shaft, and a return spring. The lower end of the piston rod abuts against the outer ring of the drive bearing. The return spring is located inside the pump body. An abutment platform is formed on the piston rod. One end of the return spring abuts against the inner wall of the pump body, and the other end of the return spring abuts against the abutment platform. When the drive motor operates and drives the eccentric shaft to rotate, the drive bearing rotates eccentrically and pushes the piston rod upward, causing the piston rod to compress the return spring. When the piston rod moves upward, the volume of the cavity in the oil inlet channel decreases, and the hydraulic oil is forced into the piston chamber by the piston rod through the oil outlet check valve; when the piston rod moves downward, the volume of the cavity in the oil inlet channel increases, creating a negative pressure, and the hydraulic oil in the oil storage chamber is drawn into the oil inlet channel through the oil inlet check valve. The pump body is also provided with an oil return channel, the two ends of which are connected to the oil storage chamber and the piston chamber respectively. A hydraulic overload protection check valve is provided in the oil return channel. The hydraulic overload protection check valve is used to open when the hydraulic pressure in the piston chamber exceeds a preset safety threshold, so that the hydraulic oil in the piston chamber flows back to the oil storage chamber through the hydraulic overload protection check valve.

[0005] Furthermore, the machine body is provided with a connecting seat, which is located below the pump body and fixedly connected to the pump body. Both sides of the top of the connecting seat are formed with arc-shaped wrapping parts, which are located on both sides of the pump body and fit against the pump body. The connecting seat is provided with a rotating cavity, and the eccentric shaft and the drive bearing are located in the rotating cavity. The lower end of the piston rod passes through the connecting seat and enters the rotating cavity and abuts against the drive bearing. The arc-shaped wrapping parts are fixedly connected to the pump body by bolts.

[0006] Furthermore, the hydraulic overload protection check valve includes a valve body, a protective spring disposed within the valve body, and a ball. A flow channel is formed within the valve body, and a limiting platform is formed on the inner wall of the flow channel. A through hole with a diameter smaller than that of the ball is opened on the limiting platform. The ball abuts against the limiting platform and blocks the through hole. The two ends of the protective spring abut against the ball and the inner wall of the valve body, respectively. The protective spring is a pre-compression spring, and its preload corresponds to the opening pressure of the check valve.

[0007] Furthermore, the hydraulic overload protection check valve also includes an abutment, which has a boss that abuts against the bottom end of the protection spring. The abutment has a semi-circular groove that matches the shape of the ball, and the ball is partially housed in the semi-circular groove and abuts against the abutment.

[0008] Furthermore, the hydraulic overload protection check valve also includes an adjusting screw threadedly connected to the valve body. The adjusting screw is threadedly connected to the end of the valve body, and an abutment groove is provided at the end of the adjusting screw facing the flow channel. One end of the protection spring abuts against the abutment groove.

[0009] Furthermore, the pump body has a pressure relief channel inside that connects the piston chamber and the oil storage chamber, and the pressure relief channel is equipped with a pressure relief component. Driving the pressure relief component to move can open the pressure relief channel.

[0010] Furthermore, the pump body has an installation channel connected to the pressure relief channel. The pressure relief assembly includes a pressure relief knob, a pressure relief valve stem mounted on the pressure relief knob, and a pressure relief bead. The pressure relief bead is located at the intersection of the installation channel and the pressure relief channel. The diameter of the pressure relief bead is larger than the diameter of the pressure relief channel. The pressure relief valve stem is located inside the installation channel and is threadedly connected to the pump body. The bottom end of the pressure relief valve stem abuts against the pressure relief bead, thereby restricting the pressure relief bead from moving backward and keeping the pressure relief channel blocked. The top end of the pressure relief valve stem protrudes outside the pump body and is connected to the pressure relief knob. Driving the pressure relief knob to rotate can drive the pressure relief valve stem to move along the installation channel away from the pressure relief bead. At this time, the hydraulic oil in the piston chamber pushes the pressure relief bead to move, connecting the pressure relief channel with the piston chamber.

[0011] Furthermore, the pressure relief knob is provided with an abutment rod, and the outer wall of the pump body is provided with a limiting rod. Driving the pressure relief knob to rotate can drive the abutment rod to rotate synchronously, and the limiting rod is located on the rotation path of the abutment rod.

[0012] Furthermore, the pump body has a connecting part formed therein, the piston chamber is inside the connecting part, the mounting base has a fixing part formed therein, the fixing part has a receiving cavity formed therein, the connecting part is located inside the receiving cavity and is fixedly connected to the fixing part, the push block has a mounting platform formed therein, the receiving cavity is also provided with abutting spring, the two ends of the abutting spring abut against the mounting platform and the bottom of the receiving cavity respectively, and the push block passes through the fixing part and is connected to the movable clamp.

[0013] The outstanding and beneficial technical effects of this invention compared to the prior art are: 1. Built-in hydraulic overload protection check valve prevents equipment damage at its source and significantly extends service life. This invention features a return oil channel directly connected to the piston chamber and oil reservoir within the pump body. A hydraulic overload protection check valve adapted to the hydraulic system is installed within this return oil channel. When the hydraulic pressure in the piston chamber exceeds a preset safety threshold, the hydraulic overload protection check valve automatically opens to release pressure instantly. This fundamentally prevents continuous overpressure operation caused by the lack of overload protection, completely eliminating problems such as drive motor stalling and winding overheating leading to complete machine failure. It also avoids pump and cylinder structure damage caused by overpressure, significantly reducing the probability of equipment failure, extending the overall machine's service life, reducing maintenance and replacement costs, ensuring construction continuity in outdoor high-altitude and remote construction sites, and fully meeting the long-term stable use requirements of engineering construction.

[0014] 2. The pumping structure is compact and efficient, ensuring stable and reliable crimping operations. This invention integrates the piston rod directly into the oil inlet channel. The reciprocating motion of the piston rod directly changes the volume of the oil inlet channel cavity. Combined with the inlet and outlet check valves, continuous oil suction and pressure actions are achieved. This eliminates the complex structure of the traditional independent plunger cavity, significantly shortens the oil circuit flow, ensures stable crimping pressure, guarantees one-time completion of the crimping operation, and reduces the workpiece scrap rate.

[0015] 3. Convenient and safe operation, highly practical. This invention integrates a knob-type pressure relief component, allowing for quick manual pressure relief and reset after operation. The abutment rod and limit rod prevent the pressure relief knob from excessive rotation and dislodging, avoiding the risk of misoperation. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention.

[0017] Figure 2 The explosion of the present invention Figure 1 .

[0018] Figure 3 This is an exploded view of the connector and the fuselage of the present invention.

[0019] Figure 4 The explosion of the present invention Figure 2 .

[0020] Figure 5 This is a schematic diagram of the internal structure of the pump body of the present invention. Figure 1 .

[0021] Figure 6 yes Figure 3 A magnified view of a portion of point A in the middle.

[0022] Figure 7 This is a perspective view of the pump body, cylinder body, and pressing assembly of the present invention.

[0023] Figure 8 This is a schematic diagram of the internal structure of the pump body of the present invention. Figure 2 .

[0024] Figure 9 This is an exploded view of the pump body, cylinder body, and crimping assembly of the present invention.

[0025] Figure 10 This is an exploded view of the pump body, push block, and abutment spring of the present invention.

[0026] Figure 11 This is a schematic diagram of the structure of the limiting rod and the abutment rod of the present invention.

[0027] Figure 12 This is an exploded view of the eccentric shaft and drive bearing of the present invention.

[0028] Figure 13 This is a cross-sectional view of the hydraulic overload protection check valve of the present invention.

[0029] Figure 14 This is an exploded view of the hydraulic overload protection check valve of the present invention.

[0030] Figure 15 This is an exploded view of the protective spring, the abutment, and the adjusting screw of the present invention.

[0031] Figure 16 This is a schematic diagram of the structure of the two clamps of the present invention when closed.

[0032] The meaning of the labels in the diagram: 1-Main body; 2-Pump body; 3-Cylinder body; 4-Mounting base; 5-Fixed chuck; 6-Modible chuck; 7-Clamping chamber; 8-Oil reservoir; 9-Oil inlet channel; 10-Piston chamber; 11-Push block; 12-Inlet check valve; 13-Outlet check valve; 14-Piston rod; 15-Return oil passage; 16-Hydraulic overload protection check valve; 17-Drive motor; 18-Eccentric shaft; 19-Drive bearing; 20-Return spring; 21-Abutment platform; 24-Valve body; 25-Protective spring; 26-Ball; 27-Flow channel; 28-Limiting stage; 29-Through hole; 30 - Abutment part; 31 - Boss; 32 - Semi-circular groove; 33 - Adjusting screw; 34-Abutment groove; 35-Pressure relief channel; 36-Installation channel; 37-Pressure relief knob; 38-Pressure relief valve stem; 39-Pressure relief bead; 40-Limit rod; 41-Abutment rod; 42-Connecting part; 43-Fixing part; 44-Receiving cavity; 45-Mounting platform; 46-Abutting spring; 47-Connecting seat; 48 - Arc-shaped wrapping part; 49 - Bolt; 50 - Rotating cavity. Detailed Implementation

[0033] The following describes specific embodiments and appendices. Figure 1-16 The present invention will be further described as follows: This embodiment discloses an electric hydraulic clamp with overload protection function. The overall structure is as shown in the attached instruction manual. Figure 1 Appendix Figure 4 As shown, the core components include a body 1, a drive assembly, a pump body 2, a cylinder body 3, and a pressing assembly. The pressing assembly is located at the front end of the pump body 2, as shown in the attached instruction manual. Figure 1 Appendix Figure 3 Appendix Figure 7 The device includes a mounting base 4, a fixed chuck 5, and a movable chuck 6. The mounting base 4 is installed at the front end of the pump body 2. The fixed chuck 5 is fixedly installed at the front end of the mounting base 4 by bolts. The movable chuck 6 is slidably installed on the mounting base 4 by a guide rail slider structure. The movable chuck 6 and the fixed chuck 5 are arranged opposite to each other, forming a clamping cavity 7 for placing the workpiece to be crimped.

[0034] The cylinder 3 is a closed cylindrical structure, which is sealed to the rear end of the pump body 2, as shown in the attached instruction manual. Figure 3 As shown, the cylinder body 3 has an oil reservoir 8 inside for storing hydraulic oil, providing the working medium for the hydraulic system. The pump body 2 has independent oil inlet channels 9 and piston chamber 10 inside. A push block 11 is slidably sealed inside the piston chamber 10. The front end of the push block 11 extends out of the pump body 2 and is fixedly connected to the movable clamp 6 on the mounting base 4 by bolts. When the push block 11 slides forward along the piston chamber 10, it can drive the movable clamp 6 to move towards the fixed clamp 5, so that the two clamps close and complete the workpiece pressing operation.

[0035] As per the instruction manual Figure 5 Appendix Figure 6As shown, an inlet check valve 12 is fixedly installed between the oil reservoir 8 and the oil inlet channel 9. The inlet check valve 12 only allows hydraulic oil to flow unidirectionally from the oil reservoir 8 to the oil inlet channel 9, and prohibits the hydraulic oil entering the oil inlet channel 9 from flowing back to the oil reservoir 8. An outlet check valve 13 is fixedly installed between the oil inlet channel 9 and the piston chamber 10. The outlet check valve 13 only allows hydraulic oil to flow unidirectionally from the oil inlet channel 9 to the piston chamber 10, and prohibits the hydraulic oil entering the piston chamber 10 from flowing back to the oil inlet channel 9. This type of check valve is common in the market and is widely used in hydraulic systems to prevent reverse flow of oil, or in pneumatic systems to prevent reverse flow of compressed air. In this case, the double check valve structure ensures unidirectional pumping of hydraulic oil and avoids pressure decay.

[0036] As per the instruction manual Figure 5 Appendix Figure 6 Appendix Figure 7 As shown, a piston rod 14 is slidably arranged inside the pump body 2 along the axial direction of the oil inlet channel 9. The upper part of the piston rod 14 extends into the oil inlet channel 9, and the lower end of the piston rod 14 extends out of the pump body 2 and is connected to the drive assembly arranged inside the machine body 1. The drive assembly can drive the piston rod 14 to perform reciprocating linear motion up and down along the axial direction of the oil inlet channel 9.

[0037] When the piston rod 14 moves upward, part of the piston rod 14 enters the oil inlet channel 9, reducing the volume of the cavity in the oil inlet channel 9 and increasing the hydraulic oil pressure inside the cavity. At this time, the oil inlet check valve 12 closes and the oil outlet check valve 13 opens, and the hydraulic oil is pressed into the piston chamber 10 by the piston rod 14 through the oil outlet check valve 13. When the piston rod 14 moves downward, part of the piston rod 14 leaves the oil inlet channel 9, increasing the volume of the cavity in the oil inlet channel 9 and creating a negative pressure inside the cavity. At this time, the oil outlet check valve 13 closes and the oil inlet check valve 12 opens, and the hydraulic oil in the oil storage chamber 8 is sucked into the oil inlet channel 9 through the oil inlet check valve 12, completing one complete oil suction-pressure pumping cycle. The continuous operation of the drive motor 17 can realize the continuous pumping of hydraulic oil.

[0038] As per the instruction manual Figure 8 As shown, a return oil channel 15 is also provided inside the pump body 2. The front end of the return oil channel 15 is connected to the piston chamber 10, and the rear end of the return oil channel 15 is connected to the oil storage chamber 8 through an oil passage. A hydraulic overload protection check valve 16 is fixedly installed inside the return oil channel 15. When the hydraulic pressure in the piston chamber 10 does not exceed the preset safety threshold, the hydraulic overload protection check valve 16 remains closed, the return oil channel 15 is disconnected, and the hydraulic system is pressurized normally. When the hydraulic pressure in the piston chamber 10 exceeds the preset safety threshold, the hydraulic overload protection check valve 16 automatically opens, and the hydraulic oil in the piston chamber 10 flows back to the oil storage chamber 8 through the return oil channel 15 and the hydraulic overload protection check valve 16, realizing automatic overload pressure relief and avoiding motor damage and equipment failure caused by continuous overpressure.

[0039] Implementation methods for driver components: In this embodiment, as per the appendix to the specification... Figure 2 Appendix Figure 3 Appendix Figure 5 Appendix Figure 7 Appendix Figure 12 As shown, a connecting seat 47 is provided on the body 1, located below the pump body 2. The connecting seat 47 securely connects the pump body 2 to the body 1 and shortens the overall length of the hydraulic clamp product. The eccentric shaft 18 and the drive bearing 19 are located within the rotating cavity 50 of the connecting seat 47, which provides installation space. Symmetrically formed upward-extending arc-shaped wrapping portions 48 are formed on both sides of the top of the connecting seat 47. These two arc-shaped wrapping portions 48 respectively encircle and fit against the left and right outer walls of the pump body 2. The inner curvature of the arc-shaped wrapping portions 48 matches the outer curvature of the pump body 2, achieving surface contact and limiting. The arc-shaped wrapping portions 48 are locked and fixed to the pump body 2 by bolts 49, completing the rigid connection between the pump body 2 and the connecting seat 47. The drive assembly includes a drive motor 17, an eccentric shaft 18, a drive bearing 19, and a return spring 20. The drive motor 17 is a brushless motor, which is horizontally fixed in the internal cavity of the machine body 1. The output end of the drive motor 17 is connected to the eccentric shaft 18 through a coupling, which can drive the eccentric shaft 18 to rotate around its own axis. The drive bearing 19 is sleeved on the eccentric section of the eccentric shaft 18. After the lower end of the piston rod 14 extends out of the pump body 2, it passes through the top of the connecting seat 47 and enters the rotating cavity 50, where it movably abuts against the outer ring of the drive bearing 19.

[0040] The piston rod 14 has an annular abutment platform 21 formed on the outer wall of the middle part. The return spring 20 is located inside the pump body 2. One end of the return spring 20 abuts against the inner wall of the pump body 2, and the other end of the return spring 20 abuts against the abutment platform 21. The return spring 20 always provides a downward return force to the piston rod 14, ensuring that the lower end of the piston rod 14 is always in close contact with the outer ring of the drive bearing 19.

[0041] The working process of this embodiment is as follows: the drive motor 17 drives the eccentric shaft 18 to rotate, and the eccentric section of the eccentric shaft 18 drives the drive bearing 19 to move upward, pushing the piston rod 14 to move upward. At the same time, the piston rod 14 compresses the return spring 20 through the contact platform 21 to complete the oil pressure action. When the eccentric shaft 18 drives the drive bearing 19 to rotate downward, the compressed return spring 20 releases its elastic force, pushing the piston rod 14 to move downward and return to its original position, so that the piston rod 14 always contacts the drive bearing 19 to complete the oil suction action. The continuous rotation of the eccentric shaft 18 can drive the piston rod 14 to complete continuous up and down reciprocating motion, realizing the continuous pumping of hydraulic oil.

[0042] The specific structure of the hydraulic overload protection check valve 16: As per the instruction manual Figure 13 Appendix Figure 14 Appendix Figure 15 As shown, the hydraulic overload protection check valve 16 includes a valve body 24, a protection spring 25, a ball 26, an abutment 30, and an adjusting screw 33. The valve body 24 is fixedly installed in the return oil channel 15 by threads. The valve body 24 has a through flow channel 27 inside, with the front end of the flow channel 27 being the oil inlet end, communicating with the piston chamber 10, and the rear end of the flow channel 27 being the oil outlet end, communicating with the oil storage chamber 8.

[0043] The inner wall of the flow channel 27 is integrally formed with a limiting platform 28. A through hole 29 is opened at the center of the limiting platform 28. The diameter of the through hole 29 is smaller than the diameter of the ball 26. The ball 26 fits against the front end face of the limiting platform 28, blocking the through hole 29 and achieving the sealing of the flow channel 27. The abutment 30 is located on the rear side of the ball 26. The rear end of the abutment 30 has a semi-circular groove 32 that matches the shape of the ball 26. The front half of the ball 26 is accommodated in the semi-circular groove 32, which can ensure the coaxiality of the movement of the ball 26 and avoid the sealing failure caused by the displacement of the ball 26. The abutment 30 has a boss 31, which protects the bottom end of the spring 25 from abutting against the boss 31 and prevents the spring from shifting.

[0044] The adjusting screw 33 is connected to the internal thread at the rear end of the valve body 24 via an external thread. A circular abutment groove 34 is formed at the end of the adjusting screw 33 facing the flow channel 27. One end of the protective spring 25 is housed within the abutment groove 34 and abuts against the bottom of the groove. The protective spring 25 is a pre-compression spring, and its preload corresponds to the opening pressure threshold of the one-way valve. By rotating the adjusting screw 33, its axial position within the valve body 24 can be adjusted, thereby changing the preload of the protective spring 25 and achieving flexible adjustment of the opening pressure threshold to adapt to the rated pressing pressure requirements of workpieces of different specifications.

[0045] Specific structure of the pressure relief assembly As per the instruction manual Figure 8 As shown, the pump body 2 has a pressure relief channel 35 inside, one end of which is connected to the piston chamber 10 and the other end is connected to the oil storage chamber 8; the side wall of the pump body 2 has an installation channel 36 that is perpendicularly connected to the pressure relief channel 35, and the outer end of the installation channel 36 extends to the outer wall of the pump body 2.

[0046] The pressure relief assembly includes a pressure relief knob 37, a pressure relief valve stem 38, and a pressure relief ball 39. The inner wall of the mounting channel 36 is threaded. The pressure relief valve stem 38 is threaded into the mounting channel 36, with its top end protruding from the pump body 2 and fixedly connected to the pressure relief knob 37, and its bottom end abutting against the pressure relief ball 39. The pressure relief ball 39 is located at the intersection of the mounting channel 36 and the pressure relief channel 35, and its diameter is larger than that of the pressure relief channel 35, thus keeping the pressure relief channel 35 closed under normal conditions and preventing the pressure relief ball 39 from flowing into the oil reservoir 8 under the pressure of hydraulic oil.

[0047] As per the instruction manual Figure 11 As shown, a radially extending abutment rod 41 is fixedly provided on the side wall of the pressure relief knob 37, and a limiting rod 40 is fixedly provided on the outer wall of the pump body 2. The limiting rod 40 is located on the rotation path of the abutment rod 41, which can limit the rotation angle of the pressure relief knob 37 and prevent the pressure relief valve rod 38 from rotating excessively and coming off.

[0048] The pressure relief operation process is as follows: After the crimping operation is completed, turn the pressure relief knob 37 to drive the pressure relief valve rod 38 to move backward along the installation channel 36. The pressure relief valve rod 38 releases the contact limit of the pressure relief ball 39. At this time, the high-pressure hydraulic oil in the piston chamber 10 pushes the pressure relief ball 39 to move, so that the piston chamber 10 is connected with the pressure relief channel 35. The hydraulic oil flows back to the oil storage chamber 8 through the pressure relief channel 35, completing the manual pressure relief. The operation is simple and convenient.

[0049] Push block 11 reset structure As per the instruction manual Figure 9 Appendix Figure 10 Appendix Figure 16 As shown, the front end of the pump body 2 is integrally formed with a cylindrical connecting part 42, and the piston chamber 10 is coaxially opened in the connecting part 42; the rear end of the mounting base 4 is integrally formed with a fixing part 43, and the fixing part 43 is provided with a receiving cavity 44 adapted to the connecting part 42. The connecting part 42 is installed into the receiving cavity 44 and fixedly connected to the fixing part 43.

[0050] The outer wall of the push block 11 is formed with an annular mounting platform 45. A retaining spring 46 is installed in the receiving cavity 44. The retaining spring 46 is sleeved on the outside of the push block 11, with its rear end abutting against the mounting platform 45 and its front end abutting against the bottom of the receiving cavity 44. When the piston cavity 10 is pressurized, the hydraulic oil pushes the push block 11 forward, compressing the retaining spring 46. When the pressure relief channel 35 is opened and the pressure in the piston cavity 10 is released, the retaining spring 46 releases its elastic force, pushing the push block 11 to move backward and reset, causing the movable chuck 6 to move away from the fixed chuck 5, automatically opening the clamping cavity 7, making it easy to remove the crimped workpiece without manual reset, thus improving work efficiency.

[0051] Complete working process of the whole machine Before operation, place the workpiece to be crimped in the clamping cavity 7 between the two clamps; adjust the opening pressure threshold of the hydraulic overload protection check valve 16 by rotating the adjusting screw 33 to match the rated crimping pressure of the workpiece to be crimped.

[0052] Start the drive motor 17, and the drive assembly drives the piston rod 14 to move up and down in a linear motion, continuously pumping the hydraulic oil in the oil storage chamber 8 into the piston chamber 10. The pressure in the piston chamber 10 continues to rise, pushing the push block 11 forward, which in turn drives the movable chuck 6 to move towards the fixed chuck 5. The two chucks close and press the workpiece.

[0053] When the pressure in the piston chamber 10 exceeds the preset safety threshold during the crimping process, the high-pressure hydraulic oil pushes the ball 26 forward, compresses the protection spring 25, and opens the through hole 29. The hydraulic oil in the piston chamber 10 flows back to the oil storage chamber 8 through the flow channel 27 and the return oil channel 15, realizing automatic pressure relief and avoiding problems such as drive motor 17 stalling and burning, hydraulic component damage, and workpiece scrapping caused by continuous overpressure.

[0054] After the crimping operation is completed, turn off the drive motor 17, turn the pressure relief knob 37 to open the pressure relief channel 35, the hydraulic oil in the piston chamber 10 flows back to the oil storage chamber 8, the pressure is released, the abutment spring 46 pushes the push block 11 and the movable chuck 6 to reset, open the clamping chamber 7, take out the crimped workpiece, and complete a complete crimping operation.

[0055] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An electric hydraulic clamp with overload protection function, comprising a body (1), a drive assembly, a pump body (2), a cylinder body (3), and a crimping assembly, characterized in that: The crimping assembly includes a mounting base (4) connected to the front end of the pump body (2), a fixed clamp (5) fixedly mounted on the mounting base (4), and a movable clamp (6) slidably mounted on the mounting base (4). A clamping cavity (7) is formed between the fixed clamp (5) and the movable clamp (6). The cylinder (3) is connected to the rear end of the pump body (2) and has an oil storage chamber (8) for storing hydraulic oil inside. The pump body (2) has an oil inlet channel (9) and a piston chamber (10) inside. A push block (11) is slidably sealed inside the piston chamber (10). The push block (11) is fixedly connected to the movable clamp (6) on the mounting base (4). Driving the push block (11) to slide can drive the movable clamp (6) to move toward the fixed clamp (5). An oil inlet check valve (12) is provided between the oil inlet channel (9) and the oil storage chamber (8) to restrict the hydraulic oil to flow into the oil inlet channel (9) only from the oil storage chamber (8). An oil outlet check valve (13) is provided between the oil inlet channel (9) and the piston chamber (10) to restrict the hydraulic oil to flow into the piston chamber (10) only from the oil inlet channel (9). The drive assembly is located inside the machine body (1), and a piston rod (14) is slidably arranged inside the pump body (2). Part of the piston rod (14) is located inside the oil inlet channel (9). The lower end of the piston rod (14) is connected to the drive assembly for transmission. The drive assembly can drive the piston rod (14) to make up-down reciprocating linear motion along the axial direction of the oil inlet channel (9). The drive assembly includes a drive motor (17), an eccentric shaft (18) connected to the drive motor (17), a drive bearing (19) sleeved on the eccentric shaft (18), and a return spring (20). The lower end of the piston rod (14) abuts against the outer ring of the drive bearing (19). The return spring (20) is located inside the pump body (2). An abutment platform (21) is formed on the piston rod (14). One end of the return spring (20) abuts against the inner wall of the pump body (2), and the other end of the return spring (20) abuts against the abutment platform (21). When the drive motor (17) works and drives the eccentric shaft (18) to rotate, the drive bearing (19) rotates eccentrically and pushes the piston rod (14) to move upward, so that the piston rod (14) compresses the return spring (20). When the piston rod (14) moves upward, the volume of the cavity in the oil inlet channel (9) decreases, and the hydraulic oil is forced into the piston chamber (10) by the piston rod (14) through the oil outlet check valve (13); when the piston rod (14) moves downward, the volume of the cavity in the oil inlet channel (9) increases to form a negative pressure, and the hydraulic oil in the oil storage chamber (8) is drawn into the oil inlet channel (9) through the oil inlet check valve (12); The pump body (2) is also provided with an oil return channel (15). The two ends of the oil return channel (15) are connected to the oil storage chamber (8) and the piston chamber (10) respectively. The oil return channel (15) is provided with a hydraulic overload protection check valve (16). The hydraulic overload protection check valve (16) is used to open when the hydraulic pressure in the piston chamber (10) exceeds the preset safety threshold, so that the hydraulic oil in the piston chamber (10) flows back to the oil storage chamber (8) through the hydraulic overload protection check valve (16).

2. The electric hydraulic clamp with overload protection function according to claim 1, characterized in that: The body (1) is provided with a connecting seat (47), which is located below the pump body (2) and is fixedly connected to the pump body (2). The top two sides of the connecting seat (47) are formed with arc-shaped wrapping parts (48), which are located on both sides of the pump body (2) and fit against the pump body (2). The connecting seat (47) is provided with a rotating cavity (50), the eccentric shaft (18) and the drive bearing (19) are located in the rotating cavity (50), and the lower end of the piston rod (14) passes through the connecting seat (47) and enters the rotating cavity (50) and abuts against the drive bearing (19). The arc-shaped wrapping part (48) is fixedly connected to the pump body (2) by bolts (49).

3. An electric hydraulic clamp with overload protection function according to claim 1, characterized in that: The hydraulic overload protection check valve (16) includes a valve body (24), a protection spring (25) disposed in the valve body (24), and a ball (26). A flow channel (27) is formed in the valve body (24), and a limiting platform (28) is formed on the inner wall of the flow channel (27). A through hole (29) with a diameter smaller than that of the ball (26) is opened on the limiting platform (28). The ball (26) abuts against the limiting platform (28) and blocks the through hole (29). The two ends of the protection spring (25) abut against the ball (26) and the inner wall of the valve body (24) respectively. The protection spring (25) is a pre-compression spring, and its preload corresponds to the opening pressure of the check valve.

4. An electric hydraulic clamp with overload protection function according to claim 3, characterized in that: The hydraulic overload protection check valve (16) also includes an abutment (30), which has a boss (31) that abuts against the bottom end of the protection spring (25). The abutment (30) has a semi-circular groove (32) that matches the shape of the ball (26). The ball (26) is partially housed in the semi-circular groove (32) and abuts against the abutment (30).

5. An electric hydraulic clamp with overload protection function according to claim 3, characterized in that: The hydraulic overload protection check valve (16) also includes an adjusting screw (33) that is threadedly connected to the valve body (24). The adjusting screw (33) is threadedly connected to the end of the valve body (24). The adjusting screw (33) has an abutment groove (34) at one end facing the flow channel (27). One end of the protection spring (25) abuts against the abutment groove (34).

6. An electric hydraulic clamp with overload protection function according to any one of claims 1-5, characterized in that: The pump body (2) has a pressure relief channel (35) inside that connects the piston chamber (10) and the oil storage chamber (8), and the pressure relief channel (35) is provided with a pressure relief component. Driving the pressure relief component to move can open the pressure relief channel (35).

7. An electric hydraulic clamp with overload protection function according to claim 6, characterized in that: The pump body (2) has an installation channel (36) that communicates with the pressure relief channel (35). The pressure relief assembly includes a pressure relief knob (37), a pressure relief valve stem (38) set on the pressure relief knob (37), and a pressure relief bead (39). The pressure relief bead (39) is located at the intersection of the installation channel (36) and the pressure relief channel (35). The diameter of the pressure relief bead (39) is larger than the diameter of the pressure relief channel (35). The pressure relief valve stem (38) is located in the installation channel (36) and is threadedly connected to the pump body (2). The bottom end of the valve stem (38) abuts against the pressure relief bead (39), thereby restricting the pressure relief bead (39) from moving backward, so that the pressure relief channel (35) is blocked. The top end of the pressure relief valve stem (38) protrudes outside the pump body (2) and is connected to the pressure relief knob (37). Driving the pressure relief knob (37) to rotate can drive the pressure relief valve stem (38) to move away from the pressure relief bead (39) along the installation channel (36). At this time, the hydraulic oil in the piston chamber (10) pushes the pressure relief bead (39) to move, so that the pressure relief channel (35) is connected to the piston chamber (10).

8. An electric hydraulic clamp with overload protection function according to claim 7, characterized in that: The pressure relief knob (37) is provided with an abutment rod (41), and the outer wall of the pump body (2) is provided with a limiting rod (40). Driving the pressure relief knob (37) to rotate can drive the abutment rod (41) to rotate synchronously, and the limiting rod (40) is located on the rotation path of the abutment rod (41).

9. An electric hydraulic clamp with overload protection function according to any one of claims 1-5, characterized in that: The pump body (2) has a connecting part (42) formed on it. The piston chamber (10) is inside the connecting part (42). The mounting base (4) has a fixing part (43) formed on it. The fixing part (43) has a receiving cavity (44) formed inside it. The connecting part (42) is located inside the receiving cavity (44) and is fixedly connected to the fixing part (43). The push block (11) has a mounting platform (45) formed on it. The receiving cavity (44) is also provided with an abutting spring (46). The two ends of the abutting spring (46) abut against the mounting platform (45) and the bottom of the receiving cavity (44) respectively. The push block (11) passes through the fixing part (43) and is connected to the movable clamp (6).

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