CN219833280U - Safe electric hydraulic pliers - Google Patents

Abstract

The utility model relates to a safe electric hydraulic clamp, which relates to the field of cable installation tools and comprises a hydraulic clamp body, wherein a clamping seat and a clamping piece are rotatably arranged on the hydraulic clamp body; the hydraulic pliers body is slidably provided with a movable pliers head which is detachably and fixedly connected with the driving end of the oil cylinder; a limiting opening is formed in one side, close to the clamping piece, of the clamping seat, and a connecting part is integrally formed on the side wall, close to the limiting opening, of the clamping piece and is embedded and clamped in the limiting opening; the fixed clamp head is detachably and fixedly connected with the clamping seat; the hydraulic clamp body is detachably and fixedly connected with a protecting belt which is detachably and fixedly connected with the clamping piece; and a crack detection module for detecting the crack state of the joint of the connecting part and the clamping part is further arranged on the clamping part, and when the crack of the connecting part and the clamping part is too deep, the crack detection state controls the oil cylinder to stop driving. The utility model has the effect of improving the safety of the electro-hydraulic pliers.

Description

Safe electric hydraulic pliers

Technical Field

The utility model relates to the field of cable installation tools, in particular to a safe electro-hydraulic clamp.

Background

The hydraulic pliers are special hydraulic tools for crimping cables and wiring terminals in power engineering, and are integrated, split, electric, manual and the like, and the charging hydraulic pliers are the most lightweight charging hydraulic tools, can be operated by one hand and are applied to crimping of power distribution operation terminals.

Currently, a common electro-hydraulic clamp mainly comprises a hydraulic clamp body and a hydraulic working end. The hydraulic pliers comprise a hydraulic pliers body, wherein the hydraulic pliers body is provided with a hydraulic cylinder body, a plunger hole for a plunger to enter and exit is formed in the hydraulic cylinder body, a sealing ring is fixed in the plunger hole, and the plunger moves back and forth along with a hydraulic handle to enter and exit the plunger hole and is in sliding fit with the inner wall of the sealing ring.

The plunger is repeatedly moved in and out of the plunger hole of the hydraulic cylinder body by manually pressing the hydraulic handle for multiple times, hydraulic oil is gradually injected into the hydraulic cylinder body, and the piston in the hydraulic cylinder body is pushed by using the Pascal principle, so that huge thrust is generated.

Referring to fig. 1, the hydraulic working end mainly includes a clamping seat 200, a fixed clamp head and a movable clamp head, an installation space for accommodating the fixed clamp head and the movable clamp head is formed on the clamping seat 200, the fixed clamp head is fixedly connected with the clamping seat 200, the fixed clamp head and the movable clamp head are oppositely arranged, the movable clamp head is in sliding fit with the clamping seat 200, and the movable clamp head is in transmission connection with the piston.

After an operator wears the wiring terminal of the cable into the wiring terminal, the operator places the wiring terminal between the fixed clamp head and the movable clamp head, and then presses a switch on the hydraulic clamp, so that the piston can push the movable clamp head to move towards the direction close to the fixed clamp head, and the wiring terminal and the cable are fixed into a whole in a crimping way.

The clamping seat 200 is in running fit with the hydraulic clamp body, the clamping hook 100 is further rotatably arranged on the hydraulic clamp body, the common clamping hook 100 is fixedly arranged in the clamping seat 200 in a built-in clamping manner, the common clamping hook 100 comprises a limiting end 110, a limiting hole 220 is formed in one end, close to the clamping hook 100, of the clamping seat 200, a receiving groove 210 matched with the clamping hook 100 is formed in the outer side wall of the clamping seat 200, the limiting hole 220 is located at the bottom of the receiving groove 210, when the hydraulic clamp head is installed, the clamping hook 100 is rotated to enter the receiving groove 210, and then the limiting end 110 is embedded in the limiting hole 220.

When the movable binding clip is driven by the driving end of the oil cylinder to move towards the direction close to the fixed binding clip, the pressure applied by the driving end of the oil cylinder to the movable binding clip is sequentially transmitted to the fixed binding clip, the clamping seat 200 and the clamping hook 100 through the wiring terminal, and the part of the clamping hook 100, which receives the pressure of the clamping seat 200, is only provided with the limiting end 110 embedded in the limiting hole 220, so that the stress on the clamping hook 100 is concentrated, the situation that the clamping end on the clamping hook 100 breaks and bounces easily occurs in the continuous pressing process, and potential safety hazards exist when an operator uses the hydraulic clamp to press a cable, so that improvement exists.

Disclosure of Invention

In order to reduce the occurrence of injury to operators caused by breaking of a clamping hook on the hydraulic clamp when the operators use the hydraulic clamp, and improve the safety of the hydraulic clamp, the utility model provides a safe electric hydraulic clamp.

The utility model provides a safe electric hydraulic clamp which adopts the following technical scheme:

the safe electric hydraulic pliers comprise a hydraulic pliers body, wherein a clamping seat and a clamping piece are rotatably arranged on the hydraulic pliers body;

the hydraulic pliers body is provided with a movable pliers head in a sliding manner, and the movable pliers head is detachably and fixedly connected with the driving end of the oil cylinder;

a limiting opening is formed in one side, close to the clamping piece, of the clamping seat, a connecting part is integrally formed on the side wall, close to the limiting opening, of the clamping piece, and the connecting part is embedded and clamped in the limiting opening;

the clamping seat is detachably and fixedly connected with a fixed clamp head, and after the connecting part is embedded and clamped in the limiting opening, the fixed clamp head is opposite to the movable clamp head;

the hydraulic clamp body is detachably and fixedly connected with a protecting belt, and one end, away from the hydraulic clamp body, of the protecting belt is detachably and fixedly connected with the clamping piece;

still be provided with crack detection module on the joint spare, crack detection module is used for detecting connecting portion with the crack state of joint spare junction, when connecting portion with the crack of joint spare junction is too dark, crack detection module control hydro-cylinder stops driving.

By adopting the technical scheme, when an operator uses the electric hydraulic pliers to press the wiring terminal and the cable, the movable pliers head matched with the wiring terminal in size is firstly arranged on the hydraulic pliers body, and then the fixed pliers head is arranged on the clamping seat; then operating personnel rotate the cassette for behind fixed binding clip and the activity binding clip relatively, inlay the joint on the joint piece in spacing mouthful, can form closed loop space on cassette and the hydraulic tong head body, distance between fixed binding clip and the hydraulic tong body is fixed this moment, and after binding post was placed between activity binding clip and the fixed binding clip, hydro-cylinder drive end drive activity binding clip moved towards the direction that is close to fixed binding clip, and exerts the pressure to binding post, makes binding post and cable internal wire be connected as an organic wholely. In the process that the piston continuously drives the movable binding clip to move towards the position close to the fixed binding clip, the crack detection module detects the crack depth at the joint of the connecting part and the clamping piece, and when the detected crack depth is greater than a set value, the crack detection module controls the oil cylinder to stop driving, so that the occurrence of the condition that the connecting part breaks and damages an operator can be effectively reduced. And because the arrangement of the protective belt, when the connecting part is stressed too much and suddenly broken, the connecting part is prevented from being far away from the clamping piece due to the restraint of the protective belt, and the broken part popped up is prevented from damaging other operators on the construction site. Compared with the original mode of clamping and matching between the limiting hole and the clamping piece, the plane where the opening of the original limiting hole is located is lower than the notch of the accommodating groove, the limiting hole is arranged in the embedded hole, the two side walls of the limiting hole are arranged on the outer side wall of the clamping seat in an external mode, and after the clamping piece is used, the clamping piece is rotated away from the limiting hole, so that the two side walls of the limiting hole can be cleaned conveniently. Meanwhile, as the plane of the opening of the limiting hole is lower than the notch of the accommodating groove, the inner side wall of the limiting hole is tightly propped against the clamping hook, the stress surface is the inner side wall of the limiting hole, the stress surface is smaller, and the clamping hook is concentrated in stress; the limiting opening is externally arranged and extends to the outer side wall of the clamping seat, the area of the tight bearing surface between the clamping seat and the clamping piece is increased, the situation that the clamping piece is excessively stressed and falls off from the clamping seat in the use process can be effectively reduced, and the stability and the bearing capacity of the electro-hydraulic pliers are improved.

Preferably, the crack detection module includes:

the ultrasonic sensor is detachably and fixedly connected with the clamping piece and is used for detecting the depth of a crack at the joint of the connecting part and the clamping piece and outputting a crack depth signal;

the ARM chip is in signal connection with the ultrasonic sensor and is used for receiving the crack depth signal, and outputting a control signal when the detected crack depth is higher than a set value;

the light-emitting diode is in signal connection with the signal output end of the ARM chip and is detachably and fixedly connected with the hydraulic clamp body at the same time, and is used for receiving the control signal and sending out an alarm signal;

and the signal output end of the ARM chip is connected with the oil cylinder in a control way, and when the detected crack depth is greater than a set value, the ARM chip controls the oil cylinder to stop driving.

By adopting the technical scheme, in the process that the driving end of the oil cylinder applies pressure to the wiring terminal, the fixed clamp head and the clamping seat through the movable clamp head, the ultrasonic sensor detects cracks at the joint of the connecting part and the clamping piece and outputs a crack state signal; the ARM chip receives the state signals of the crack states and compares the state signals, when the crack in the joint position between the connecting part and the clamping piece easily causes the connecting part to break away from the clamping piece, the ARM chip controls the oil cylinder to stop driving, and meanwhile, the light-emitting diode light-emitting warning clamping piece is in a state close to breaking, so that the state of the clamping piece of an operator is warned, and the situation that the damage to the operator is caused by the breaking of the clamping piece can be effectively reduced.

Preferably, a first clamping wall which is obliquely arranged is formed on one side, close to the clamping piece, of the limiting opening, and the first clamping wall is inclined towards the direction away from the movable clamp head;

a second clamping wall which is obliquely arranged is formed on one side, close to the movable clamp head, of the connecting part, and the second clamping wall is oblique towards the direction close to the movable clamp head;

the first clamping wall and the second clamping wall are parallel to each other, and after the clamping piece is embedded and clamped in the limiting opening, the first clamping wall and the second clamping wall are abutted.

Through adopting above-mentioned technical scheme, because first joint wall and second joint wall are the slope form setting, when first joint wall and second joint wall laminating support tightly afterwards, be similar to the state of hooking between connecting portion and the cassette, but further reduce in the use the condition emergence that the joint atress is too big and drop with the cassette, further promote hydraulic tong's stability.

Preferably, a first engagement angle is formed between the first clamping wall and the outer side wall of the clamping seat, a second engagement angle is formed between the second clamping wall and the side wall, close to the clamping seat, of the connecting portion, and the first engagement angle and the second engagement angle are all round-corner-shaped.

Through adopting above-mentioned technical scheme, operating personnel is embedding joint in spacing mouthful in-process with joint spare upper junction, and first linking angle and second linking angle contact, and first linking angle is the fillet form setting with the second linking angle, and operating personnel can comparatively laborsaving fix the junction lock joint on spacing mouthful, promotes the convenience of operating personnel installation hydraulic tongs.

Preferably, the clamping piece is provided with a limiting plate in an integrated manner, a limiting clamping groove is formed in the outer side wall, close to the clamping piece, of the clamping seat, and the limiting clamping groove is matched with the limiting plate;

when the first clamping wall is abutted against the second clamping wall, the limiting plate is embedded into the limiting clamping groove.

Through adopting above-mentioned technical scheme, the both sides of limiting plate are restricted between two lateral walls that spacing draw-in groove is relative, and reducible joint spare and cassette joint are fixed back joint spare and are rocked about the condition emergence, further promote hydraulic tong's stability.

Preferably, one side of the clamping piece far away from the clamping seat is in threaded connection with a fixing bolt, a rod portion of the fixing bolt penetrates through the end portion of the protecting belt and extends into the clamping piece, and the protecting belt abuts against between a bolt portion of the fixing bolt and the side wall of the clamping piece.

Through adopting above-mentioned technical scheme, fixing bolt can realize dismantling fixed connection's technical effect between protective belt and the joint spare.

In summary, the utility model comprises at least one of the following beneficial technical effects:

1. through the arrangement of the protection belt, one end of the protection belt is fixedly connected with the hydraulic clamp body, and one end of the protection belt, which is far away from the hydraulic clamp body, is fixedly connected with the clamping piece, so that the conditions that the connecting part is stressed and broken and bounces excessively and damages other operators on a construction site can be effectively reduced, and the personal safety of the operators can be effectively ensured;

2. through mutual overlapping and use among the ultrasonic sensor, the ARM chip, the light emitting diode and the oil cylinder, when the depth of a crack at the joint of the connecting part and the clamping piece is higher than a set value, the ARM chip controls the oil cylinder to stop driving and simultaneously controls the light emitting diode to emit a warning signal to warn an operator that the clamping piece is about to break, so that the occurrence of injury of the operator due to the breaking of the clamping piece is further reduced;

3. through with the external fixed with cassette joint of joint spare, can increase the contact surface of joint spare and cassette, and then increase the atress face of joint spare, effectively promote stability and compressive capacity of hydraulic tong, and spacing mouth is external in the outside of cassette, can promote the convenience of the attached impurity on the operating personnel clearance hydraulic tong.

Drawings

Fig. 1 is a schematic view mainly used for showing the overall structure of a hydraulic clamp head in the background art.

Fig. 2 is a schematic view mainly used for showing the overall structure of the hydraulic clamp head according to the embodiment of the utility model.

Fig. 3 is an enlarged view a of fig. 2, mainly for showing a detailed structure between the clamping member and the clamping seat on the hydraulic clamp head.

Fig. 4 is a schematic diagram mainly used for showing the ultrasonic detection of crack depth separation in the embodiment of the utility model.

Fig. 5 is a schematic diagram of an embodiment of the present utility model mainly used for showing internal signal transmission of the hydraulic pliers.

Reference numerals illustrate: 100. a clamping hook; 110. a limiting end; 200. a clamping seat; 210. a receiving groove; 220. a limiting hole; 1. a hydraulic clamp body; 11. a light emitting diode; 2. a clamping seat; 21. a limit opening; 211. a first clamping wall; 22. a limit clamping groove; 23. a first engagement angle; 3. a clamping piece; 31. a connection part; 311. a second clamping wall; 32. a limiting plate; 33. a second engagement angle; 34. a fixing screw; 4. a movable clamp head; 5. fixing the clamp head; 8. an ultrasonic sensor; 81. a transmitting end; 82. a receiving end; 9. and (5) protecting the belt.

Detailed Description

The utility model is described in further detail below with reference to fig. 2-5.

Examples

The embodiment of the utility model discloses a safe electric hydraulic clamp. Referring to fig. 2, the electro-hydraulic pliers mainly include a hydraulic pliers body 1, on which a clamping seat 2 and a clamping piece 3 are installed through two rotating shafts, and the clamping seat 2 and the clamping piece 3 are oppositely arranged.

Referring to fig. 2, the clamping seat 2 is approximately circular, the inner side wall of the clamping seat 2 is embedded and detachably and fixedly connected with a fixed clamp head 5, one side of the hydraulic clamp body 1, which is close to the clamping seat 2, is embedded and slidably provided with a movable clamp head 4, and the movable clamp head 4 is detachably and fixedly connected with a piston of the oil cylinder.

In the embodiment of the utility model, the movable binding clip 4 and the fixed binding clip 5 are arranged approximately in a semicircular arc shape, and when the clamping seat 2 rotates until the fixed binding clip 5 is opposite to the movable binding clip 4, an operator can rotate the clamping piece 3, so that the clamping piece 3 is clamped and fixed with the clamping seat 2.

At this time, the distance between the fixed clamp head 5 and the hydraulic clamp body 1 on the clamping seat 2 is fixed, an operator inserts a wiring terminal between the fixed clamp head 5 and the movable clamp head 4, and starts the hydraulic clamp, the driving end of the oil cylinder drives the movable clamp head 4 to move towards the direction close to the fixed clamp head 5, and the movable clamp head 4 applies pressure to the wiring terminal, so that the wiring terminal and the end part of the cable are tightly connected into a whole.

Because the plane of the opening of the limiting hole is lower than the notch of the accommodating groove, the inner side wall of the limiting hole is tightly propped against the clamping hook, the stress surface is the inner side wall of the limiting hole, the stress surface is smaller, and the clamping hook is concentrated in stress; the limiting opening 21 extends to the outer side wall of the clamping seat 2 externally, the area of a stress surface propped between the clamping seat 2 and the clamping piece 3 is increased, the situation that the clamping piece 3 is excessively stressed and falls off from the clamping seat 2 in the using process can be effectively reduced, and the stability and the bearing capacity of the electro-hydraulic pliers are improved.

Meanwhile, compared with the original mode of clamping and matching between the limiting hole and the clamping piece 3, the plane where the opening of the original limiting hole is located is lower than the notch of the accommodating groove, the limiting hole is arranged in the embedded hole, and the two side walls of the limiting hole 21 are arranged on the outer side wall of the clamping seat 2 in an external mode, after the clamping piece 3 is rotated away from the limiting hole 21, and therefore the two side walls of the limiting hole 21 can be cleaned conveniently.

In order to achieve the technical effect of detachable and fixed connection between the clamping seat 2 and the clamping piece 3, referring to fig. 2 and 3, a limiting opening 21 is formed on the outer side wall of the clamping seat 2, which is close to the clamping piece 3, and a first clamping wall 211 is formed on one side of the limiting opening 21, which is close to the hydraulic clamp body 1.

The end part of the clamping piece 3, which is close to the clamping seat 2, is integrally formed and extended to be provided with a connecting part 31, and one side of the connecting part 31, which is close to the liquid level clamp body, is formed with a second clamping wall 311.

The length of the first clamping wall 211 is matched with the length of the second clamping wall 311, when an operator rotates the clamping seat 2 to enable the fixed clamp head 5 on the clamping seat 2 to be opposite to the movable clamp head 4, the operator can rotate the clamping piece 3, and the connecting portion 31 on the clamping piece 3 is buckled in the limiting opening 21, so that the first clamping wall 211 is attached to the second clamping wall 311.

When the piston drives the movable binding clip 4 to move towards the direction close to the fixed binding clip 5, and the connecting terminal is abutted between the fixed binding clip 5 and the movable binding clip 4, the first clamping wall 211 is abutted with the second clamping wall 311, and the connecting part 31 limits the movement of the clamping seat 2 towards the direction far away from the hydraulic clamp body 1.

The hydraulic clamp body 1 is fixedly connected with a protecting belt 9 through a screw, one end of the clamping piece 3, which is far away from the hydraulic clamp body 1, is provided with a fixing bolt 34, the rod part of the fixing bolt 34 penetrates through the protecting belt 9 and then extends into the clamping piece 3, and the protecting belt 9 is abutted against the bolt part of the fixing bolt 34 between the clamping pieces 3.

Due to the arrangement of the protecting belt 9, when the connecting part 31 is stressed too much and suddenly breaks, the connecting part 31 is limited by the protecting belt 9 and is not far away from the clamping piece 3, and the broken part which is prevented from being ejected causes injury to other operators on the construction site.

In order to prevent the connection portion 31 of the clamping member 3 from breaking, a crack detection module is disposed on the clamping member 3.

Referring to fig. 3 and 5, in the embodiment of the present utility model, the crack detection module mainly includes an ultrasonic sensor 8, an ARM chip and a light emitting diode 11.

The ultrasonic sensor 8 is fixed on the side wall of the clamping piece 3 through a screw, and a signal output end of the ultrasonic sensor 8 is in signal connection with a signal input end of an ARM chip, and a signal output end of the ARM chip is in signal connection with the light emitting diode 11 and the oil cylinder.

In the process that the driving end of the oil cylinder applies pressure to the wiring terminal, the fixed clamp head 5 and the clamping seat 2 through the movable clamp head 4, the ultrasonic sensor 8 detects cracks at the joint of the connecting part 31 and the clamping piece 3 and outputs a crack state signal; the ARM chip receives the state signals of the crack states and compares the state signals, when the crack at the joint position between the connecting part 31 and the clamping piece 3 easily causes the connecting part 31 to collapse away from the clamping piece 3, the ARM chip controls the oil cylinder to stop driving, meanwhile, the light-emitting diode 11 emits light to warn the clamping piece 3 to be in a state close to the collapse state, and warn operators that the clamping piece 3 is in the state, so that the damage to the operators caused by the collapse of the clamping piece 3 can be effectively reduced.

Referring to fig. 4, the ultrasonic sensor 8 includes a transmitting end 81 and a receiving end 82, and in the embodiment of the present utility model, a symmetrical measurement method is adopted.

Because joint spare 3 and connecting portion 31 integrated into one piece, the position of linking between joint spare 3 and the connecting portion 31 is the position that the crack appears easily, installs transmitting end 81 and receiving end 82 and fixes in the both sides of crack, through the decay that detects the sound wave, can survey the cracked degree of depth.

It should be noted that, in the embodiment of the present utility model, the ARM chip is preloaded with a program for comparing the crack depth, which is the prior art, and in the embodiment of the present utility model, no modification and optimization are performed, and no description is given here.

Meanwhile, in some other embodiments, according to the actual use requirement, the image of the crack may be acquired by the CCD camera, and the crack width is compared by the chip loaded with the image processing program, so as to achieve the technical effect of the crack detection of the clamping piece 3, which is not limited herein.

Referring to fig. 3, in the embodiment of the present utility model, the first clamping wall 211 and the second clamping wall 311 are both inclined, and the first clamping wall 211 is inclined towards the direction away from the hydraulic clamp body 1, the second clamping wall 311 is inclined towards the direction close to the hydraulic clamp body 1, and the first clamping wall 211 and the second clamping wall 311 are parallel to each other.

After the connecting portion 31 is embedded and clamped in the limiting opening 21, the connecting portion 31 and the clamping seat 2 are in a state similar to a hooked and clamped state, so that the falling-off condition of the clamping piece 3 and the clamping seat 2 can be further reduced, and the stability of the hydraulic pliers is improved.

Referring to fig. 2, in the embodiment of the present utility model, the clamping member 3 is integrally provided with a limiting plate 32, and the limiting plate 32 is integrally connected with the connecting portion 31, the clamping seat 2 is provided with a limiting slot 22 adapted to the limiting plate 32, and the limiting slot 22 penetrates through the first clamping wall 211 and the end portion of the clamping seat 2.

When operating personnel rotate the clamping piece 3 and make the clamping between clamping piece 3 and the cassette 2 fixed, limiting plate 32 inlays to be established in spacing draw-in groove 22, limiting plate 32 inlays to be established between two opposite lateral walls of spacing draw-in groove 22, can restrict the position of clamping piece 3, further reduces the condition emergence that clamping piece 3 breaks away from with cassette 2, further promotes the stability of hydraulic tongs.

Referring to fig. 3, a first engagement angle 23 is formed between the first clamping wall 211 and the outer side wall of the clamping seat 2, a second engagement angle 33 is formed between the second clamping wall 311 and the end surface of the connecting portion 31, and the first engagement angle 23 and the second engagement angle 33 are both provided in a rounded shape.

The operating personnel is embedding joint in spacing mouthful 21 with connecting portion 31 on the joint spare 3 in-process, and first linking angle 23 and the contact of second linking angle 33, and first linking angle 23 and second linking angle 33 are the fillet form setting, and operating personnel can comparatively laborsaving with connecting portion 31 lock joint fixed on spacing mouthful 21, promotes the convenience of operating personnel installation hydraulic tongs.

The implementation principle of the safe electro-hydraulic clamp provided by the embodiment of the utility model is as follows: through the arrangement of the protection belt 9, one end of the protection belt 9 is fixedly connected with the hydraulic clamp body 1, and one end of the protection belt 9 far away from the hydraulic clamp body 1 is fixedly connected with the clamping piece 3, so that the occurrence of the condition that the connecting part 31 is subjected to overlarge fracture and flick to cause injury to other operators on a construction site can be effectively reduced, and the personal safety of the operators can be effectively ensured; through mutual overlapping and use among the ultrasonic sensor 8, the ARM chip, the light emitting diode 11 and the oil cylinder, when the depth of a crack at the joint of the connecting part 31 and the clamping piece 3 is higher than a set value, the ARM chip controls the oil cylinder to stop driving and simultaneously controls the light emitting diode 11 to emit a warning signal to warn an operator that the clamping piece 3 is about to break, so that the condition that the operator is injured due to the breaking of the clamping piece 3 is further reduced; through with the external fixed with cassette 2 joint of joint spare 3, can increase the contact surface of joint spare 3 and cassette 2, and then increase the atress face of joint spare 3, effectively promote the stability and the compressive capacity of hydraulic tong.

The above embodiments are not intended to limit the scope of the present utility model, so: all equivalent changes in structure, shape and principle of the utility model should be covered in the scope of protection of the utility model.

Claims (6)

1. The safe electric hydraulic pliers are characterized by comprising a hydraulic pliers body (1), wherein a clamping seat (2) and a clamping piece (3) are rotatably arranged on the hydraulic pliers body (1);

a movable clamp head (4) is slidably arranged on the hydraulic clamp body (1), and the movable clamp head (4) is detachably and fixedly connected with the driving end of the oil cylinder;

a limiting opening (21) is formed in one side, close to the clamping piece (3), of the clamping piece (2), a connecting portion (31) is formed in an integrated mode on the side wall, close to the limiting opening (21), of the clamping piece (3), and the connecting portion (31) is embedded and clamped in the limiting opening (21);

the clamping seat (2) is detachably and fixedly connected with a fixed clamp head (5), and after the connecting part (31) is embedded and clamped in the limiting opening (21), the fixed clamp head (5) is opposite to the movable clamp head (4);

a protecting belt (9) is detachably and fixedly connected to the hydraulic clamp body (1), and one end, away from the hydraulic clamp body (1), of the protecting belt (9) is detachably and fixedly connected with the clamping piece (3);

still be provided with crack detection module on joint spare (3), crack detection module is used for detecting connecting portion (31) with the crack state of joint spare (3) junction, when connecting portion (31) with the crack of joint spare junction is too dark, crack detection module control hydro-cylinder stops the drive.

2. The safety electro-hydraulic clamp of claim 1, wherein the crack detection module comprises:

the ultrasonic sensor (8) is detachably and fixedly connected with the clamping piece (3) and is used for detecting the depth of a crack at the joint of the connecting part (31) and the clamping piece (3) and outputting a crack depth signal;

the ARM chip is in signal connection with the ultrasonic sensor (8) and is used for receiving the crack depth signal, and when the detected crack depth is higher than a set value, a control signal is output;

the light-emitting diode (11) is in signal connection with the signal output end of the ARM chip and is detachably and fixedly connected with the hydraulic clamp body (1) at the same time, and is used for receiving the control signal and sending out an alarm signal;

and the signal output end of the ARM chip is connected with the oil cylinder in a control way, and when the detected crack depth is greater than a set value, the ARM chip controls the oil cylinder to stop driving.

3. The safety electro-hydraulic pliers according to claim 1, wherein a first clamping wall (211) which is obliquely arranged is formed on one side of the limiting opening (21) close to the clamping piece (3), and the first clamping wall (211) is inclined towards a direction away from the movable pliers head (4);

a second clamping wall (311) which is obliquely arranged is formed on one side of the connecting part (31) close to the movable clamp head (4), and the second clamping wall (311) is oblique towards the direction close to the movable clamp head (4);

the first clamping wall (211) and the second clamping wall (311) are parallel to each other, and after the clamping piece (3) is embedded and clamped in the limiting opening (21), the first clamping wall (211) and the second clamping wall (311) are abutted.

4. A safety electro-hydraulic clamp according to claim 3, wherein a first engagement angle (23) is formed between the first clamping wall (211) and the outer side wall of the clamping seat (2), a second engagement angle (33) is formed between the second clamping wall (311) and the side wall of the connecting portion (31) close to the clamping seat (2), and the first engagement angle (23) and the second engagement angle (33) are all round.

5. The safe electro-hydraulic pliers according to claim 3, wherein the clamping piece (3) is integrally formed with a limiting plate (32), a limiting clamping groove (22) is formed in the outer side wall, close to the clamping piece (3), of the clamping seat (2), and the limiting clamping groove (22) is matched with the limiting plate (32);

after the first clamping wall (211) is abutted against the second clamping wall (311), the limiting plate (32) is embedded in the limiting clamping groove (22).

6. A safety electrohydraulic clamp according to claim 1, characterized in that a side of the clamping element (3) remote from the clamping seat (2) is screwed with a fixing bolt (34), the shaft of the fixing bolt (34) extends through the end of the protective strip (9) into the clamping element (3), and the protective strip (9) is held tightly between the bolt of the fixing bolt (34) and the side wall of the clamping element (3).