Shearing pliers head and shearing tool

Abstract

The invention belongs to the technical field of shearing equipment, and particularly relates to a shearing tong head and a shearing tool. The shearing tool comprises a shearing plier head and a driving device used for driving the shearing plier head to work, the shearing plier head comprises a plier head seat, a first plier body and a second plier body, at least one first connecting rod is hinged to the rear end of the first plier body, and at least one second connecting rod is hinged to the rear end of the second plier body. The first connecting rod and the second connecting rod are installed on the push rod through a connecting rod pin, a guiding and regulating structure is arranged between the tong head seat and the connecting rod pin, and the guiding and regulating structure can guide the connecting rod pin and regulate acting force outside the moving direction of the connecting rod pin. When the first clamp body and the second clamp body deflect due to uneven stress, the guide convex part can abut against the side wall of the guide groove and conduct direction regulation, and the rotation stability of the first clamp body and the second clamp body is guaranteed. And the movement consistency of the push rod and the piston rod can be guaranteed, the piston is prevented from deviating and scratching the side wall of the piston cavity, and the service life of the cylinder body is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of shearing equipment, in particular to a shearing pliers head and a shearing tool. Background Art

[0002] A shearing tool typically consists of a shear head and a drive mechanism. The shear head contains a head base, two blades, a connecting rod, and a push rod. The two blades are rotatably mounted on the head base, with the front ends of the blades forming the jaws, and the rear ends of the blades being movably mounted on the same push rod via corresponding connecting rods. The drive mechanism is typically a hydraulic device, comprising a hydraulic cylinder with a piston chamber, a piston disposed within the piston chamber, and a push rod that extends directly into the piston chamber and connects to the piston, or indirectly via a piston rod. When the piston moves, it drives the push rod and enables the two blades to close.

[0003] When the shearing tool is cutting cables, especially multi-core cables (such as three-phase, three-phase four-wire) and armored cables, the shearing forces on the two blades of the shearing tool are inconsistent due to the different specifications and quantities of cable conductors and the random placement of the cables. As a result, the two blades will deflect during rotation and shearing, causing the blades, connecting rods and push rods to bear not only axial thrust but also radial offset load. The radial offset load will be transmitted to the piston rod and piston through the push rod, causing the piston to bear radial force and cause abnormal wear of the hydraulic cylinder, and even adverse phenomena such as hydraulic cylinder wear and oil leakage. Summary of the Invention

[0004] The object of the present invention is to provide a shearing pliers head and a shearing tool with a simple and stable structure and a long service life.

[0005] The object of the present invention is achieved like this:

[0006] A shearing pliers head comprises: a pliers head seat having a pliers body mounting portion and a push rod mounting portion, the pliers body mounting portion being provided with a mounting cavity and mounting windows arranged on both sides of the mounting cavity; a first pliers body and a second pliers body being rotatably arranged on the pliers body mounting portion, the front ends of the first pliers body and the second pliers body cooperating with each other to form a jaw, the rear end of the first pliers body being hinged with at least one first connecting rod, and the rear end of the second pliers body being hinged with at least one second connecting rod, the first connecting rod and the second connecting rod respectively entering the mounting cavity through the corresponding mounting windows; a push rod being movably arranged in the push rod mounting portion and having a connecting rod mounting portion located in the mounting cavity; and a connecting rod pin for connecting the first connecting rod and the second connecting rod to the connecting rod mounting portion; wherein a guide regulating structure is provided between the pliers head seat and the connecting rod pin, the guide regulating structure being capable of guiding the connecting rod pin and regulating the force acting outside its moving direction.

[0007] The present invention is further provided with that the guide regulation structure includes a guide groove arranged on the inner wall of the clamp head seat and a guide protrusion arranged on the end of the connecting rod pin; or, the guide regulation structure includes a guide protrusion arranged on the inner wall of the clamp head seat and a guide groove arranged on the end of the connecting rod pin.

[0008] The present invention further provides that the inner wall of the clamp head seat is symmetrically provided with guide grooves; the two ends of the connecting rod pin are symmetrically provided with long strip guide protrusions, and the guide protrusions each have a first guide surface and a second guide surface in contact with the guide groove.

[0009] The present invention is further provided with at least one connecting rod pin assembly hole on the side wall of the clamp head seat, through which the connecting rod pin can quickly enter the mounting cavity of the clamp head seat and be assembled and connected with the first connecting rod, the second connecting rod and the connecting rod mounting portion.

[0010] The present invention is further provided with two first connecting rods symmetrically arranged at the rear end of the first caliper body, and two second connecting rods symmetrically arranged at the rear end of the second caliper body; the connecting rod mounting portion has two mounting ribs distributed at intervals, and the connecting rod pin passes through the first connecting rod, the mounting rib, the second connecting rod, the other first connecting rod, the mounting rib and the other second connecting rod in sequence; a connecting rod retaining ring is provided at the outermost sides of both ends of the connecting rod pin, one side of the connecting rod retaining ring rests on the first connecting rod / second connecting rod, and the other side rests on the side wall of the caliper head seat.

[0011] The present invention further provides that the push rod mounting portion is provided with a push rod mounting hole, a guide washer is provided on the push rod mounting hole, the inner hole of the guide washer is adapted to the outer diameter of the push rod, and the push rod is movably arranged in the push rod mounting portion through the guide washer (116).

[0012] The present invention is further provided with that the first pliers body and the second pliers body are installed on the pliers body mounting part through a pliers head pin assembly, and the pliers head pin assembly includes a pliers head pin, a locking block, a locking screw and a pliers head pin nut, one end of the pliers head pin is provided with a guard, the other end is provided with a first external thread and an accommodating cavity for installing the locking block, and the accommodating cavity passes through the side wall where the first external thread is located; a threaded hole is provided in the middle of the locking block, and the locking screw can be installed in the threaded hole and can abut against the end face of the accommodating cavity, and the outer wall of the locking block is provided with a local external thread that is adapted to the shape of the first external thread; the pliers head pin nut is threadedly connected to the first external thread and the local external thread at the same time, and the locking block is driven to move relative to the pliers head pin by adjusting the locking screw to prevent the pliers head pin nut from loosening.

[0013] A shearing tool comprises a shearing pliers head and a driving device connected to the shearing pliers head and used for driving a push rod to move and realize the operation of the shearing pliers head.

[0014] The present invention is further provided with a shearing pliers head which is detachably arranged on a driving device through a quick-change connecting device, the driving device comprising a cylinder body, a connecting seat and a piston assembly, a piston chamber being formed between the cylinder body and the connecting seat, a piston assembly being arranged in the piston chamber, and the piston assembly having a piston rod which can extend out of the connecting seat; the quick-change connecting device comprising a pliers head quick-change connecting mechanism arranged between the pliers head seat and the connecting seat and a push rod quick-change connecting mechanism arranged between the push rod and the piston rod.

[0015] The present invention is further provided with a push rod quick-change connection mechanism having a connecting cavity opened at one end of the piston rod, a push rod connecting part arranged at one end of the push rod and a locking assembly radially arranged in the push rod connecting part, the connecting cavity is divided into a first connecting section and a second connecting section, the inner diameter of the first connecting section is larger than that of the second connecting section, the middle part of the first connecting section is circumferentially provided with a limiting protrusion for limiting the locking assembly, and a disengagement groove for disengagement of the locking assembly is formed between two adjacent limiting protrusions; the push rod connecting part has a first push rod connecting part adapted to the first connecting section and a second push rod connecting part adapted to the second connecting section, thereby realizing circumferential fixation of the push rod and the piston rod; the second push rod connecting part is radially provided with a locking hole, and a locking assembly is movably arranged in the locking hole, which can extend out of the locking hole and cooperate with the limiting protrusion for limiting.

[0016] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0017] 1. The present invention provides a guide and regulation structure between the pliers head seat and the connecting rod pin. The guide and regulation structure can guide the connecting rod pin and regulate the forces acting outside the direction of its movement. When the jaws are subjected to force deviation, the first guide surface or the second guide surface of the guide protrusion can abut against the side wall of the guide groove and regulate the direction, thereby ensuring the rotational stability of the first and second pliers bodies, preventing the first and second pliers bodies from deflecting when subjected to uneven force, and making the force on the jaws more uniform. In addition, it can also ensure the consistency of the movement of the push rod and the piston rod, prevent the piston from deviating and scratching the side wall of the piston cavity, and increase the service life of the cylinder body.

[0018] 2. The present invention has at least one connecting rod pin assembly hole on the side wall of the clamp head seat. The connecting rod pin can quickly enter the mounting cavity of the clamp head seat through the connecting rod assembly hole and be assembled and connected with the first connecting rod, the second connecting rod and the connecting rod mounting portion, thereby greatly improving the assembly efficiency.

[0019] 3. The present invention provides connecting rod retaining rings at the outermost sides of both ends of the connecting rod pin. One side of the connecting rod retaining ring abuts against the first connecting rod / second connecting rod, and the other side abuts against the side wall of the clamp head seat, thereby limiting the lateral movement of the first connecting rod / second connecting rod. This structure has the advantages of easy installation and low cost.

[0020] 4. The clamp head seat of the present invention is provided with at least one installation window that allows the push rod to enter. The push rod mounting portion is provided with a push rod mounting hole, and a guide washer is provided on the push rod mounting hole. The split design of the clamp head seat and the guide washer allows for higher processing precision and reduces friction with the push rod. Even if the guide washer is worn, it only needs to be replaced, thus reducing maintenance costs. At the same time, the push rod is installed on the clamp head seat at an angle through the installation window. Compared with the original assembly method of inserting the push rod into the installation window parallel to the axis of the push rod mounting hole, it can reduce the length of the installation window and the installation cavity of the clamp head seat, thereby reducing the size of the clamp head seat, reducing the weight of the component, and also improving assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the shearing tool of the present invention.

[0022] Figure 2 It is a structural schematic diagram of the shearing pliers head of the present invention.

[0023] Figure 3 It is a structural schematic diagram of a shearing pliers head with a hidden pliers head seat according to the present invention.

[0024] Figure 4 It is a cross-sectional view of the cutting pliers head of the present invention.

[0025] Figure 5 It is an exploded view of the cutting pliers head of the present invention.

[0026] Figure 6 It is a partial cross-sectional view of the quick-change connection device of the present invention.

[0027] Figure 7 yes Figure 6 Cross-sectional view at AA in the middle.

[0028] Figure 8 It is a structural schematic diagram of a portion of the quick-change connection device on the drive device of the present invention.

[0029] Figure 9 yes Figure 7 Cross-sectional view at the middle BB.

[0030] The meaning of the numbers in the figure:

[0031] Cutting pliers head 1; drive device 2; quick-change connection device 3; housing 4; battery pack 5;

[0032] Clamp head base 11; caliper body mounting portion 111; push rod mounting portion 112; push rod mounting cavity 1121; guide groove 113; connecting rod pin assembly hole 114; mounting window 115; guide washer 116; display mark 117; first caliper body 12; guide block 121; second caliper body 13; first connecting rod 14; second connecting rod 15; push rod 16; connecting rod mounting portion 161; mounting rib 1611; mounting base 1612; push rod spring 162; spring retaining ring 163; connecting rod pin 17; guide protrusion 171; connecting rod retaining ring 172; caliper head pin assembly 18; caliper head pin 181; accommodating cavity 1811; first external thread 1812; locking block 182; partial external thread 1821; positioning pin portion 1822; locking screw 183; caliper head pin nut 184; protective cover 19;

[0033] Cylinder body 21; connecting seat 22; connecting screw 221; sleeve mounting convex ring 222; piston assembly 23; piston rod 231; piston limiting groove 2311; piston 232; piston spring 233; piston limiting pin 234;

[0034] Connecting cavity 31; first connecting section 311; second connecting section 312; limiting protrusion 313; disengagement groove 314; push rod connecting portion 32; first push rod connecting portion 321; second push rod connecting portion 322; locking assembly 33; locking member 331; locking spring 332; locking limiting member 333; sliding sleeve 34; sliding sleeve pushing portion 341; air-avoiding groove portion 342; sliding sleeve limiting groove 343; sliding sleeve limiting member 344; sliding sleeve spring 35; limiting pin 36; plug-in portion 37; axial limiting protrusion 371; limiting pin hole 372; plug-in groove 38; axial limiting groove portion 381; axial installation gap 382; directional limiting portion 383;

[0035] Power switch 41. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with specific embodiments:

[0037] Example 1:

[0038] like Figure 1 As shown, a shearing tool includes a shearing pliers head 1, a driving device 2, a battery pack 5 and a housing 4.

[0039] A drive device 2 is provided in the housing 4. One end of the drive device 2 extends out of the housing 4 and is connected to the cutter head 1. A power switch 41 and a battery pack 5 are provided on the housing 4. The battery pack 5 supplies power to the tool. By controlling the power switch 41, the drive device 2 drives the cutter head 1 to work.

[0040] like Figure 2-5As shown, the shearing pliers head includes a pliers head base 11 , a first pliers body 12 , a second pliers body 13 , a pliers head pin assembly 18 , a first connecting rod 14 , a second connecting rod 15 , a push rod 16 and a connecting rod pin 17 .

[0041] like Figure 2 As shown, the pliers head seat 11 has a pliers body mounting portion 111 and a push rod mounting portion 112. The push rod mounting portion 112 is roughly cylindrical, and a push rod mounting hole for mounting the push rod 16 is provided in the middle. The push rod 16 is movably provided in the push rod mounting hole. The push rod 16 has a push rod main body and a connecting rod mounting portion 161 connecting the first connecting rod 14 and the second connecting rod 15.

[0042] The caliper body mounting portion 111 is two connecting arms symmetrically arranged on the end surface of the push rod mounting portion 112. The connecting arms and the caliper body mounting portion 111 are integrally formed. An installation space for installing the first caliper body 12 and the second caliper body 13 is formed between the ends of the two connecting arms, and a caliper head pin mounting hole is provided. A caliper head pin assembly 18 is provided in the caliper head pin mounting hole. The first caliper body 12 and the second caliper body 13 can be rotatably set on the caliper body mounting portion 111 through the caliper head pin assembly 18.

[0043] like Figure 3 As shown, the front ends of the first and second jaws 12, 13 have blades that cooperate to form the jaws. A guide block 121 is mounted on one of the blades, which defines a blade guide groove. When the jaws are closed, the other blade preemptively contacts the sidewall of the blade guide groove, preventing misalignment and deformation between the first and second jaws 12, 13, thereby ensuring cutting quality.

[0044] At least one first connecting rod 14 is hinged to the rear end of the first caliper body 12 , and at least one second connecting rod 15 is hinged to the rear end of the second caliper body 13 . The first connecting rod 14 and the second connecting rod 15 are connected to the connecting rod mounting portion 161 via a connecting rod pin 17 .

[0045] In this embodiment, two first connecting rods 14 are symmetrically provided at the rear end of the first caliper body 12, and two second connecting rods 15 are symmetrically provided at the rear end of the second caliper body 13. Specifically, first pin holes are provided at both ends of the first connecting rod 14 and the second connecting rod 15, and connecting pins are provided at the rear ends of the first caliper body 12 and the second caliper body 13. One end of the two first connecting rods 14 and the two second connecting rods 15 are respectively mounted on the connecting rod pin ends of the corresponding caliper body through the first pin holes and are limited by a retaining spring. The connecting rod mounting portion 161 has a mounting base 1612 and two mounting ribs 1611 spaced apart on the mounting base 1612. A second pin hole for mounting a connecting rod pin 17 is provided on the mounting rib 1611. The connecting rod pin 17 passes through the first connecting rod 14, the mounting rib 1611, the second connecting rod 15, another first connecting rod 14, another mounting rib 1611 and another second connecting rod 15 in sequence to achieve movable cooperation. When the push rod 16 moves, it can drive the corresponding first pliers body 12 and the second pliers body 13 to move through the first connecting rod 14 and the second connecting rod 15 to achieve closing and opening of the jaws.

[0046] like Figure 4 As shown, a guide regulation structure is provided between the clamp head seat 11 and the connecting rod pin 17. When the push rod 16 moves, the guide regulation structure can guide the connecting rod pin 17 and regulate the force outside the moving direction.

[0047] The guide structure includes a guide groove 113 provided on the inner wall of the clamp head base 11 and a guide protrusion 171 provided on the end of the connecting rod pin 17. Specifically, the guide grooves 113 are symmetrically provided on the inner walls of the two connecting arms of the clamp head base 11, and are arranged along the movement direction of the push rod 16. The connecting rod pin 17 is symmetrically provided at both ends with elongated guide protrusions 171, each of which has a first guide surface and a second guide surface that contact the guide groove 113. When the connecting rod pin 17 is arranged between the two connecting arms, the guide protrusions 171 at both ends of the connecting rod pin 17 are embedded in the corresponding guide grooves 113, and the first guide surface and the second guide surface are adapted to the side walls of the guide grooves 113, so that the connecting rod pin 17 can only move along the moving direction of the push rod 16. When the jaws are subjected to force deviation, the first guide surface or the second guide surface can abut against the side walls of the guide grooves 113 and regulate the direction, thereby ensuring the rotational stability of the first and second jaw bodies 12, 13, preventing the first and second jaw bodies 12, 13 from deflecting when the force is uneven, and making the force on the jaws more uniform. In addition, it can also ensure the consistency of the movement of the push rod and the piston rod, prevent the piston from deviating and scratching the side walls of the piston cavity, and increase the service life of the cylinder body.

[0048] In order to facilitate the installation of the connecting pin 17, at least one connecting pin assembly hole 114 is provided on the side wall of the clamp head seat 11. In this embodiment, corresponding connecting pin assembly holes 114 are provided on the two connecting arms respectively. The inner diameter of the connecting pin assembly hole 114 is adapted to or slightly larger than the outer diameter of the connecting pin 17. The connecting pin 17 can quickly enter the installation cavity of the clamp head seat 11 (i.e., the installation space between the two connecting arms) through the connecting pin assembly hole 114, and be assembled and connected with the first connecting rod 14, the second connecting rod 15 and the connecting rod mounting portion 161, thereby greatly improving the assembly efficiency.

[0049] Preferably, the connecting rod pin assembly hole 114 is connected to the guide groove 113 to facilitate the installation of the connecting rod pin 17. In addition, the connecting rod pin assembly hole 114 is located on the side close to the caliper mounting portion 111. The travel of the connecting rod 17 is generally limited by the travel of the push rod 16. Generally, the connecting rod 17 will not reach the installation position of the connecting rod assembly hole 114.

[0050] In order to prevent the first connecting rod 14 / the second connecting rod 15 from falling off or shifting, a connecting rod retaining ring 172 is provided at the outermost ends of the connecting rod pin 17. One side of the connecting rod retaining ring 172 abuts against the first connecting rod 14 / the second connecting rod 15, and the other side abuts against the side wall of the clamp head seat 11 (i.e., the inner surface of the connecting arm), thereby limiting the lateral movement of the first connecting rod 14 / the second connecting rod 15. This structure has the advantages of easy installation and low cost. In addition, the connecting rod retaining ring 172 is designed as a boss. The larger end contacts the first connecting rod 14 / the second connecting rod 15, which can increase the contact area with the first connecting rod 14 / the second connecting rod 15, making the installation more stable; the smaller end contacts the clamp head seat 11, which can reduce the contact area with the clamp head seat 11 and reduce sliding friction.

[0051] In this embodiment, an installation space for installing the first caliper body 12 and the second caliper body 13 and an installation cavity for installing the push rod 16, the first connecting rod 14, the second connecting rod 15 and the connecting rod pin 17 are formed between the ends of the two connecting arms. The size of the installation space is smaller than the size of the installation push rod 16 (mainly the installation base 1612), resulting in the push rod 16 being unable to pass through the installation space and enter the installation cavity.

[0052] like Figure 2 As shown, at least one installation window 115 is provided on the side wall of the clamp head base 11 to allow the push rod 16 to enter. In this embodiment, the installation window 115 is formed between the two connecting arms, which is equivalent to providing two installation windows 115. The width of the installation window 115 is greater than the outer diameter of the installation base 1612 of the push rod 16, ensuring that the push rod 16 can enter the installation cavity.

[0053] In order to facilitate the push rod 16 to slide on the clamp head seat 11, a guide washer 116 is provided on the push rod mounting hole in this embodiment. The inner hole of the guide washer 116 is adapted to the outer diameter of the push rod 16, and the outer periphery of the guide washer 116 has a step portion. The main body of the guide washer 116 can be embedded in the push rod mounting hole and cooperate with the push rod 16.

[0054] In order to reduce the overall length of the clamp head seat 11, the length of the installation window 115 of this embodiment is also smaller than the length of the push rod 16. In order to prevent the push rod mounting hole from interfering with the installation of the push rod 16, the inner diameter of the push rod mounting hole must be larger than the outer diameter of the push rod body, and a certain gap is provided between the two. In this embodiment, when the push rod 16 is tilted through the installation window 115 and enters the push rod mounting hole, the push rod 16 can be axially arranged in the push rod mounting hole only after the connecting rod mounting portion 161 of the push rod 16 enters the installation cavity. Thereafter, the guide washer 116 is sleeved onto the outer end of the push rod body of the push rod 16 and slides into the push rod mounting hole, thereby achieving the coordinated installation of the three. The inner diameter of the push rod mounting hole is mainly determined by the size of the push rod 16 and the tilted installation angle, but it is smaller than the outer diameter of the mounting base 1612. The mounting base 1612 can abut the end face of the push rod mounting hole and limit the extreme position of the push rod 16's retreat.

[0055] In addition, the push rod 16 can be slidably set on the guide washer 116. On the one hand, the guide washer 116 facilitates the inclined installation of the push rod 16; on the other hand, it can also provide a guiding support function for the push rod 16; at the same time, the guide washer 116 is made of wear-resistant material, which can reduce the friction with the push rod 16. After wear, only the guide washer 116 needs to be replaced, which does not affect the use of the clamp head seat 11 and reduces the maintenance cost.

[0056] The push rod mounting portion 112 further defines a push rod mounting cavity 1121 that communicates with the push rod mounting hole. One end of the push rod mounting cavity 1121 is open. When the push rod 16 is inserted into the push rod mounting hole, the guide washer 116 enters the open side of the push rod mounting cavity 1121 and is installed in the push rod mounting hole, thereby allowing the push rod 16 to be movably mounted within the push rod mounting portion 112.

[0057] Preferably, a protective cover 19 is provided outside the mounting window 115. The protective cover 19 can cover the clamp head seat 11 and the rear ends of the first and second clamp bodies 12, 13, preventing fingers or other objects from accidentally entering the mounting cavity of the clamp head seat 11, thereby protecting the operator and the tool from normal use. At the same time, the protective cover 19 covers the outside of the connecting rod pin assembly hole 114, further preventing the connecting rod pin 17 from falling, while also providing an aesthetically pleasing effect.

[0058] A push rod spring 162 and a spring retaining ring 163 are also provided at the outer end of the push rod body of push rod 16. One end of push rod spring 162 abuts against guide washer 116, while the other end abuts against spring retaining ring 163. Spring retaining ring 163 is mounted to the push rod body via a retaining ring retaining spring. Push rod spring 162 automatically resets push rod 16. At the same time, the travel of push rod 16 is limited by push rod spring 162.

[0059] In addition, the outer diameter of the step portion of the guide washer 116 is adapted to the inner diameter of the push rod mounting cavity 1121, and the outer diameter of the main body of the guide washer 116 is adapted to the push rod mounting hole. When the guide washer 116 is embedded in the push rod mounting hole, the guide washer 116, under the action of the push rod spring 162, makes the step portion rest against the end wall of the push rod mounting hole, thereby fixing the position of the guide washer 116 and ensuring that the push rod 16 can move stably on the guide washer 116.

[0060] Preferably, the outer diameter of the spring retaining ring 163 is adapted to the inner diameter of the push rod installation cavity 1121, and the inner diameter of the spring retaining ring 163 is adapted to the outer diameter of the push rod main body of the push rod 16, so that the push rod installation cavity 1121 can be sealed to prevent impurities from entering when the shearing pliers head 1 is stored alone; at the same time, when the push rod 16 moves, the spring retaining ring 163 can also play a guiding and supporting role.

[0061] like Figure 4 、 5 As shown, the first caliper body 12 and the second caliper body 13 are mounted on the caliper body mounting portion 111 via a caliper head pin assembly 18. The caliper head pin assembly 18 includes a caliper head pin 181, a locking block 182, a locking screw 183, and a caliper head pin nut 184. One end of the caliper head pin 181 is provided with a flange, and the other end is provided with a first external thread 1812 and an accommodating cavity 1811 for mounting the locking block 182. The accommodating cavity 1811 extends through the side wall where the first external thread 1812 is located. In this embodiment, the accommodating cavity 1811 is generally shaped like a straight slot extending through the side wall, and a locking screw positioning hole is provided at the bottom of the straight slot.

[0062] The locking block 182 has symmetrically extending stop portions on both sides, and the outer wall of the stop portion is formed with a partial external thread 1821 that is adapted to the shape of the first external thread 1812. The end face of the locking block 182 is axially extended with a positioning pin portion 1822 that is adapted to the inner diameter of the locking screw positioning hole. A threaded hole is opened in the middle of the locking block 182 and passes through the positioning pin portion 1822, and a locking screw 183 is arranged in the threaded hole.

[0063] After locking block 182 is inserted into accommodating cavity 1811, it is positioned and engaged with pliers pin 181 via positioning pin portion 1822. The partial external thread 1821 fills the gap left by the first external thread 1812, allowing locking screw 183 to rest against the end face of accommodating cavity 1811, i.e., the end face of the locking screw positioning hole. When pliers pin nut 184 is installed onto first external thread 1812 of pliers pin 181, it simultaneously threadably engages the partial external thread 1821 of locking block 182. At this point, adjusting locking screw 183 drives locking block 182 to move relative to pliers pin 181, creating resistance between locking block 182 and pliers pin nut 184, thereby preventing pliers pin nut 184 from loosening. When disassembly is required, it is only necessary to reversely adjust the locking screw 183 so that it leaves the end face of the locking screw positioning hole, so that the resistance between the locking block 182 and the clamp head pin nut 184 can be released, and the clamp head pin nut 184 can be easily disassembled.

[0064] like Figure 6-7 As shown, the driving device 2 includes a cylinder body 21, a connecting seat 22 and a piston assembly 23. The connecting seat 22 is threadedly connected to the end of the cylinder body 21. An annular groove is also provided on the side wall of the cylinder body 21. A connecting screw 221 is provided on the connecting seat 22. The end of the connecting screw 221 extends into the annular groove to prevent the connecting seat 22 from separating from the cylinder body 21.

[0065] A piston chamber is formed between the cylinder body 21 and the connecting seat 22. A piston assembly 23 is disposed within the piston chamber. The piston assembly 23 comprises a piston rod 231, a piston 232, and a piston spring 233 mounted on the outside of the piston rod 231. One end of the piston rod 231 is separately or integrally formed with the piston 232. The other end of the piston rod 231 extends beyond the connecting seat 22 and is provided with a flange extending therefrom. This flange serves to limit the axial position of the piston rod 231, preventing the piston rod 231 from fully entering the piston chamber. In this embodiment, to prevent the piston rod 231 from rotating, a piston limiting groove 2311 is defined in the sidewall of the piston rod 231. A piston limiting pin 234 is fixed to the cylinder body 21. One end of the piston limiting pin 234 engages with the piston limiting groove 2311, limiting the axial movement of the piston rod 231.

[0066] The quick-change connection device 3 includes a pliers head quick-change connection mechanism provided between the pliers head seat 11 and the connection seat 22 and a push rod quick-change connection mechanism provided between the push rod 16 and the piston rod 231 .

[0067] The pliers head quick-change connection mechanism includes a sliding sleeve 34 , a sliding sleeve spring 35 , at least one limiting pin 36 , an inserting portion 37 provided on the pliers head base 11 , and an inserting slot 38 provided on the connecting base 22 .

[0068] like Figure 2As shown, the outer end of the push rod mounting portion 112 of the clamp head seat 11 forms a plug-in portion 37, and the outer side wall of the plug-in portion 37 is provided with a plurality of axial limiting protrusions 371 evenly distributed in the circumference. In this embodiment, there are three groups of axial limiting protrusions 371, and each group has the same structure, that is, the axial limiting protrusions 371 include multiple axially arranged axial limiting protrusions. Figure 8 As shown, the connecting seat 22 has an insertion groove 38 that matches the shape of the insertion portion 37. The inner wall of the insertion groove 38 is provided with an axial limiting groove portion 381 that matches the shape of the axial limiting protrusion 371. The axial limiting groove portions 381 are divided into three groups, and each group of axial limiting grooves has a plurality of axial limiting grooves that can accommodate corresponding axial limiting protrusions. An axial installation gap 382 that can accommodate the axial limiting protrusion 371 is formed between two adjacent axial limiting groove portions 381. During installation, the axial limiting protrusion 371 of the insertion portion 37 is aligned with the axial installation gap 382 and enters the insertion groove 38. The insertion portion 37 is then rotated to allow the axial limiting protrusion 371 to enter the corresponding axial limiting groove portion 381, thereby achieving axial limitation of the clamp head seat 11 and the connecting seat 22.

[0069] like Figure 9 As shown, to limit the circumferential position of the plug portion 37 within the insertion slot 38, at least one stepped hole is formed through the sidewall of the insertion slot 38. Each stepped hole is provided with a stepped stopper pin 36, the length of which is greater than the length of the stepped hole. Corresponding stopper pin holes 372 are provided at corresponding positions on the plug portion 37. When the plug portion 37 is installed, the stopper pin 36 can extend through the stepped hole and enter the stopper pin hole 372, thereby achieving circumferential positioning of the plug portion 37.

[0070] In this embodiment, each group of axial limiting protrusions 371 corresponds to two limiting pins 36, and a limiting pin hole 372 is provided on the corresponding axial limiting protrusion of the corresponding axial limiting protrusion 371, wherein one limiting pin 36 cooperates with the limiting pin hole 372, and the other limiting pin hole 372 cooperates with one end face of the axial limiting protrusion to realize the reverse limiting. In addition, a directional limiting portion 383 is provided at the end of the axial limiting groove corresponding to each axial limiting groove portion 381, and the directional limiting portion 383 can cooperate with the other end face of the axial limiting protrusion. At the same time, the directional limiting portion 383 can also ensure the directional rotation installation of the plug-in portion 37. Figure 9 As shown, the plug portion 37 can only be moved into the installation position in a clockwise direction and can only be moved out of the installation position in a counterclockwise direction.

[0071] In this embodiment, the position of the limit pin 36 is locked and unlocked by the sliding sleeve 34. Figure 7As shown, the sliding sleeve 34 is movably mounted on the outside of the connecting seat 22 via a sliding sleeve spring 35. Specifically, the inner wall of the sliding sleeve 34 is provided with a sliding sleeve abutment portion 341 and a clearance groove portion 342. The connecting seat 22 is provided with a sliding sleeve mounting protrusion 222. The sliding sleeve spring 35 abuts between the sliding sleeve mounting protrusion 222 and the end wall of the sliding sleeve abutment portion 341. Simultaneously, a retaining spring is used to limit the position of the other end of the sliding sleeve 34 against the connecting seat 22. Under the action of the sliding sleeve spring 35, the sliding sleeve 34 is pressed against the retaining spring. At this time, the sliding sleeve abutment portion 341 is located outside the stepped hole and can abut the outer end of the limit pin 36, ensuring that the inner end of the limit pin 36 is always engaged with the limit pin hole 372. When it is necessary to contact the circumferential limit, the sleeve 34 is moved under the action of external force so that the air avoidance groove 342 is located outside the step hole, and the limit pin 36 can move freely in the air avoidance groove 342. After the clamp head seat 11 rotates, it can drive the limit pin 36 to move outward to unlock the circumferential position.

[0072] To help users better understand the distance to press the sleeve 34, at least one sleeve limiting groove 343 is defined at the lower end of the inner wall of the sleeve 34. The depth of the sleeve limiting groove 343 is set according to the travel distance of the sleeve 34. A corresponding sleeve limiting member 344 is mounted on the sleeve mounting protrusion 222. The sleeve limiting member 344 is preferably a steel ball. Passing through the end surface of the sleeve limiting groove 343, the steel ball limits the distance to which the sleeve 34 can be pressed downward. This distance is just sufficient to ensure that the sleeve push portion 341 is properly clear of the stepped hole. This prevents excessive compression of the sleeve spring 35 and effectively reduces the pressure applied by the user.

[0073] Preferably, if Figure 1 、 5 As shown, a marking 117 indicating that the cutting pliers head is in place is provided at the connection between the protective cover 19 and the cylinder body 21 or at the connection between the clamp head base 11 and the cylinder body 21. The marking 117 is a dot or an arrow. When the two markings are aligned, it indicates that the cutting pliers head is in place. In this embodiment, the protective cover 19, the cylinder body 21 and the clamp head base 11 are each provided with three evenly distributed markings 117, which facilitates checking whether the cutting pliers head is in place from different angles.

[0074] like Figure 6 As shown, the push rod quick-change connection mechanism has a connection cavity 31 opened at one end of the piston rod 231, a push rod connection portion 32 arranged at one end of the push rod 16, and a locking assembly 33 radially arranged in the push rod connection portion 32.

[0075] The connecting cavity 31 is divided into a first connecting section 311 and a second connecting section 312 from the outside to the inside. The inner diameter of the first connecting section 311 is larger than that of the second connecting section 312. A limiting protrusion 313 is circumferentially provided in the middle of the first connecting section 311 for limiting the locking assembly 33. A disengagement groove 314 is formed between two adjacent limiting protrusions 313 for disengaging the locking assembly 33. The push rod connecting portion 32 includes a first push rod connecting portion 321 adapted to fit with the first connecting section 311 and a second push rod connecting portion 322 adapted to fit with the second connecting section 312. The outer diameter of the second push rod connecting portion 322 is smaller than that of the first push rod connecting portion 321 and smaller than that of the push rod main body. When the shearing pliers head 1 is quickly installed, since the outer diameter of the second push rod connecting portion 322 is much smaller than the inner diameter of the first connecting section 311, the accuracy of the insertion can be effectively guaranteed; when the push rod connecting portion 32 is fully inserted, the first push rod connecting portion 321 is positioned and matched with the first connecting section 311, and the second push rod connecting portion 322 is positioned and matched with the second connecting section 312, thereby realizing the circumferential positioning of the push rod 16 and the piston rod 231, and at the same time further ensuring the coaxiality of the push rod 16 and the piston rod 231.

[0076] The push rod connecting portion 32 is integrally or separately provided at the outer end of the push rod main body of the push rod 16. In this embodiment, the push rod connecting portion 32 and the push rod main body are integrally formed to ensure the coaxiality of the two.

[0077] like Figure 6 When the locking cam 331 is unlocked, the locking cam 332 is unlocked and the unlocking cam 333 is unlocked, so that the unlocking cam 331 can be unlocked in the unlocking cam 333. When the locking cam 331 is unlocked, the unlocking cam 332 is unlocked and the unlocking cam 333 is unlocked.

[0078] In addition, the driving device 2 also includes a hydraulic mechanism for driving the piston assembly 23 to move. The hydraulic mechanism has an oil bag, an oil inlet check valve, a plunger assembly, an oil outlet check valve, a pressure relief valve and a motor assembly. The rear end of the cylinder body 21 is respectively provided with an oil inlet channel and an oil return channel connecting the oil bag and the piston chamber. The oil inlet channel is sequentially provided with an oil inlet check valve, a plunger assembly and an oil outlet check valve, and the oil return channel is provided with a pressure relief valve. The motor assembly drives the plunger assembly to move back and forth to realize oil intake into the piston chamber to realize the extension of the piston rod 231, and the push rod 4 is reset synchronously and drives the jaws to close; when the pressure in the piston chamber reaches the threshold, the pressure relief valve automatically opens to realize pressure relief and oil return, and the piston assembly 23 is automatically reset under the action of the piston spring 233, and the push rod 4 is reset synchronously and drives the jaws to open.

[0079] Example 2:

[0080] This embodiment is basically the same as the first embodiment, except that this embodiment adopts a fixed installation method of the cutting pliers head 1 , in which the cutting pliers head 1 is fixed on the driving device 2 .

[0081] Specifically, the driving device 2 includes a cylinder body 21, a piston chamber is opened at one end of the cylinder body 21, the clamp head seat 11 of the shearing pliers head 1 and the end of the cylinder body 21 where the piston chamber is located are threadedly connected, the push rod 16 extends into the piston chamber and is connected to the piston 232, and a piston spring 233 is mounted on the outside of the push rod 16. The piston spring 233 rests between the piston 232 and the clamp head seat 11, so that the push rod 16, the piston 232 and the piston spring 233 form a piston assembly 23.

[0082] Example 3:

[0083] This embodiment is basically the same as the first embodiment, except that:

[0084] The guide regulation structure of this embodiment includes a guide protrusion 171 provided on the inner wall of the clamp head base 11 and a guide groove 113 provided at the end of the connecting rod pin 17. Specifically, the inner walls of the two connecting arms are symmetrically provided with long strips of guide protrusions 171, which are arranged along the movement direction of the push rod 16. The guide grooves 113 are symmetrically provided at both ends of the connecting rod pin 17, and the connecting rod pin 17 is slidably provided on the guide protrusions 171 through the guide grooves 113.

[0085] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A shearing pliers head, characterized in that: include: The clamp head seat (11) comprises a clamp body mounting portion (111) and a push rod mounting portion (112); a mounting cavity and mounting windows (115) arranged on both sides of the mounting cavity are provided in the clamp body mounting portion (111); The first pliers (12) and the second pliers (13) are rotatably mounted on the pliers mounting portion (111), and the front ends of the first pliers (12) and the second pliers (13) cooperate with each other to form a jaw, the rear end of the first pliers (12) is hinged with at least one first connecting rod (14), and the rear end of the second pliers (13) is hinged with at least one second connecting rod (15), and the first connecting rod (14) and the second connecting rod (15) respectively enter the mounting cavity through the corresponding mounting window (115); A push rod (16) movably disposed in the push rod mounting portion (112) and having a connecting rod mounting portion (161) located in the mounting cavity; and A connecting rod pin (17) for connecting the first connecting rod (14) and the second connecting rod (15) to the connecting rod mounting portion (161); A guide regulation structure is provided between the clamp head seat (11) and the connecting rod pin (17), and the guide regulation structure can guide the connecting rod pin (17) and regulate the force outside the moving direction thereof.

2. A cutting pliers head according to claim 1, characterized in that: The guide regulation structure includes a guide groove (113) provided on the inner wall of the clamp head seat (11) and a guide protrusion (171) provided at the end of the connecting rod pin (17); Alternatively, the guide regulation structure includes a guide protrusion (171) provided on the inner wall of the clamp head seat (11) and a guide groove (113) provided at the end of the connecting rod pin (17).

3. A cutting pliers head according to claim 2, characterized in that: The guide grooves (113) are symmetrically arranged on the inner wall of the clamp head seat (11); Long strip-shaped guide protrusions (171) are symmetrically provided at both ends of the connecting rod pin (17), and each of the guide protrusions (171) has a first guide surface and a second guide surface that are in contact with the guide groove (113).

4. A cutting pliers head according to any one of claims 1 to 3, characterized in that: At least one connecting rod pin assembly hole (114) is provided on the side wall of the clamp head seat (11), and the connecting rod pin (17) can quickly enter the installation cavity of the clamp head seat (11) through the connecting rod pin assembly hole (114) and be assembled and connected with the first connecting rod (14), the second connecting rod (15) and the connecting rod mounting portion (161).

5. A cutting pliers head according to claim 4, characterized in that: Two first connecting rods (14) are symmetrically provided at the rear end of the first clamp body (12), and two second connecting rods (15) are symmetrically provided at the rear end of the second clamp body (13); The connecting rod mounting portion (161) has two mounting ribs (1611) spaced apart, and the connecting rod pin (17) is sequentially passed through a first connecting rod (14), the mounting rib (1611), a second connecting rod (15), another first connecting rod (14), the mounting rib (1611), and another second connecting rod (15); Connecting rod retaining rings (172) are provided at the outermost sides of both ends of the connecting rod pin (17). One side of the connecting rod retaining ring (172) abuts against the first connecting rod (14) / the second connecting rod (15), and the other side abuts against the side wall of the clamp head seat (11).

6. A cutting pliers head according to claim 1, characterized in that: The push rod mounting portion (112) is provided with a push rod mounting hole, and a guide washer (116) is provided on the push rod mounting hole. The inner hole of the guide washer (116) is adapted to the outer diameter of the push rod (16), and the push rod (16) is movably arranged in the push rod mounting portion (112) through the guide washer (116).

7. A cutting pliers head according to any one of claims 1 to 3, characterized in that: The first caliper body (12) and the second caliper body (13) are mounted on the caliper body mounting portion (111) via a caliper head pin assembly (18), wherein the caliper head pin assembly (18) comprises a caliper head pin (181), a locking block (182), a locking screw (183) and a caliper head pin nut (184). One end of the clamp head pin (181) is provided with a retaining edge, the other end is provided with a first external thread (1812) and an accommodating cavity (1811) for installing the locking block (182), and the accommodating cavity (1811) passes through the side wall where the first external thread (1812) is located; A threaded hole is provided in the middle of the locking block (182), and the locking screw (183) can be mounted in the threaded hole to abut against the end surface of the accommodating cavity (1811). The outer wall of the locking block (182) is provided with a partial external thread (1821) that matches the shape of the first external thread (1812). The clamp head pin nut (184) is simultaneously threadedly connected to the first external thread (1812) and the partial external thread (1821), and the locking block (182) is driven to move relative to the clamp head pin (181) by adjusting the locking screw (183) to prevent the clamp head pin nut (184) from loosening.

8. A shearing tool, characterized in that: include: A shearing pliers head (1), a shearing pliers head (1) according to any one of claims 1 to 7; as well as A driving device (2) is connected to the shearing pliers head (1) and is used to drive the push rod (16) to move and realize the operation of the shearing pliers head (1).

9. A shearing tool according to claim 8, characterized in that: The shearing pliers head (1) is detachably mounted on the driving device (2) via a quick-change connection device (3). The driving device (2) comprises a cylinder body (21), a connecting seat (22), and a piston assembly (23); a piston cavity is formed between the cylinder body (21) and the connecting seat (22); a piston assembly (23) is provided in the piston cavity; the piston assembly (23) has a piston rod (231) capable of extending out of the connecting seat (22); The quick-change connection device (3) comprises a clamp head quick-change connection mechanism arranged between the clamp head seat (11) and the connection seat (22) and a push rod quick-change connection mechanism arranged between the push rod (16) and the piston rod (231).

10. A shearing tool according to claim 9, characterized in that: The push rod quick-change connection mechanism comprises a connection cavity (31) provided at one end of the piston rod (231), a push rod connection portion (32) provided at one end of the push rod (16), and a locking assembly (33) radially provided in the push rod connection portion (32). The connecting cavity (31) is divided into a first connecting section (311) and a second connecting section (312). The inner diameter of the first connecting section (311) is larger than that of the second connecting section (312). A limiting protrusion (313) for limiting the locking assembly (33) is circumferentially provided in the middle of the first connecting section (311). A disengagement groove (314) for disengaging the locking assembly (33) is formed between two adjacent limiting protrusions (313). The push rod connecting portion (32) has a first push rod connecting portion (321) adapted to the first connecting section (311) and a second push rod connecting portion (322) adapted to the second connecting section (312), thereby achieving circumferential positioning of the push rod (16) and the piston rod (231); The second push rod connecting portion (322) is radially provided with a locking hole, in which the locking assembly (33) is movably arranged. The locking assembly (33) can extend out of the locking hole and cooperate with the limiting protrusion (313) for limiting.

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