Pliers and cutting tools

Abstract

This utility model belongs to the technical field of shearing equipment, specifically referring to a shearing pliers head and a shearing tool. The shearing tool includes a shearing pliers head and a driving device for driving the shearing pliers head. The shearing pliers head includes: a pliers head base, a first pliers body, and a second pliers body. At least one first connecting rod is hinged to the rear end of the first pliers body, and at least one second connecting rod is hinged to the rear end of the second pliers body. The first and second connecting rods are mounted on a push rod via connecting rod pins. A guide structure is provided between the pliers head base and the connecting rod pins. This guide structure can guide the connecting rod pins and regulate forces acting outside their direction of movement. When the first and second pliers bodies deflect due to uneven force, the guide protrusion can abut against the side wall of the guide groove and regulate their direction, ensuring the rotational stability of the first and second pliers bodies; it also ensures the consistency of movement of the push rod and piston rod, preventing piston deviation and scratching of the piston cavity side wall, and increasing the service life of the cylinder.

Description

Technical Field

[0001] This utility model belongs to the field of shearing equipment technology, specifically referring to a shearing pliers head and a shearing tool. Background Technology

[0002] Cutting tools generally include a cutting jaw and a drive mechanism. The cutting jaw contains a jaw base, two blades, a connecting rod, and a push rod. The two blades are rotatably mounted on the jaw base, with their front ends forming jaws and their rear ends movably mounted on the same push rod via corresponding connecting rods. The drive mechanism is generally a hydraulic device, including a hydraulic cylinder with a piston chamber containing a piston. The push rod extends directly into the piston chamber and connects to the piston, or indirectly through a piston rod. When the piston moves, it drives the push rod to move, thus closing the two blades.

[0003] When shearing tools are used to cut 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 the cable conductors and their arbitrary placement. This causes the two blades to deflect during rotation, so that the blades, connecting rods, and push rods not only have to bear axial thrust but also radial off-center load. This radial off-center load is transmitted to the piston rod and piston through the push rod, causing the piston to bear radial force, which leads to abnormal wear of the hydraulic cylinder and even adverse phenomena such as hydraulic cylinder scoring, wear, and oil leakage. Utility Model Content

[0004] The purpose of this invention is to provide a simple, stable, and long-lasting cutting pliers head and cutting tool.

[0005] The purpose of this utility model is achieved as follows:

[0006] A cutting pliers head includes: a pliers head base having a pliers body mounting portion and a push rod mounting portion; a first pliers body and a second pliers body rotatably mounted on the pliers body mounting portion, the front ends of the first pliers body and the second pliers body engaging with each other to form jaws, the rear end of the first pliers body being hinged to at least one first connecting rod, and the rear end of the second pliers body being hinged to at least one second connecting rod; a push rod movably mounted within the push rod mounting portion and having a connecting rod mounting portion; 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 structure is provided between the pliers head base and the connecting rod pin, the guide structure being able to guide the connecting rod pin and regulate forces acting outside its direction of movement.

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

[0008] The present invention further includes symmetrical guide grooves on the inner wall of the pliers head seat; and elongated guide protrusions symmetrically arranged at both ends of the connecting rod pin, each guide protrusion having a first guide surface and a second guide surface that contact the guide groove.

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

[0010] This utility model further includes a mounting cavity and mounting windows on both sides of the mounting cavity within the clamp body mounting portion; two first connecting rods are symmetrically arranged at the rear end of the first clamp body, and two second connecting rods are symmetrically arranged at the rear end of the second clamp body, with the first and second connecting rods respectively entering the mounting cavity through the corresponding mounting windows; the connecting rod mounting portion has two spaced-apart mounting ribs, and a connecting rod pin sequentially passes through the first connecting rod, the mounting rib, the second connecting rod, another first connecting rod, another mounting rib, and another second connecting rod; connecting rod retaining rings are provided on the outermost ends of both ends of the connecting rod pin, with one side of the connecting rod retaining ring abutting against the first / second connecting rod and the other side abutting against the side wall of the clamp head seat.

[0011] The present invention further includes a push rod mounting hole provided in the push rod mounting part, and a guide washer provided in 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 mounted in the push rod mounting part through the guide washer (116).

[0012] This utility model further includes a first clamp body and a second clamp body mounted on a clamp body mounting part via a clamp head pin assembly. The clamp head pin assembly includes a clamp head pin, a locking stop, a locking screw, and a clamp head pin nut. One end of the clamp head pin is provided with a retaining edge, and the other end is provided with a first external thread and a receiving cavity for installing the locking stop. The receiving cavity penetrates the side wall where the first external thread is located. The locking stop has a threaded hole in the middle. After the locking screw is installed in the threaded hole, it can abut against the end face of the receiving cavity. The outer side wall of the locking stop has a partial external thread that matches the shape of the first external thread. The clamp head pin nut is threadedly connected to both the first external thread and the partial external thread. By adjusting the locking screw, the locking stop is driven to move relative to the clamp head pin to prevent the clamp head pin nut from loosening.

[0013] A cutting tool includes: a cutting pliers head; and a drive device connected to the cutting pliers head for driving a push rod to move and enabling the cutting pliers head to work.

[0014] The present invention further includes a cutting pliers head that is detachably mounted on a drive device via a quick-change connecting device. The drive device includes a cylinder, a connecting seat, and a piston assembly. A piston chamber is formed between the cylinder and the connecting seat, and a piston assembly is disposed within the piston chamber. The piston assembly has a piston rod that can extend out of the connecting seat. The quick-change connecting device includes a pliers head quick-change connecting mechanism disposed between the pliers head seat and the connecting seat, and a push rod quick-change connecting mechanism disposed between the push rod and the piston rod.

[0015] This utility model further includes a push rod quick-change connection mechanism having a connecting cavity at one end of the piston rod, a push rod connecting part at one end of the push rod, and a locking component radially disposed within 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. A limiting protrusion for limiting the locking component is circumferentially disposed in the middle of the first connecting section, and a release groove for the locking component to disengage 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 achieving circumferential fixation of the push rod and the piston rod. The second push rod connecting part has a locking hole radially opened, and a locking component is movably disposed within the locking hole, which can extend out of the locking hole and cooperate with the limiting protrusion for limiting.

[0016] The outstanding and beneficial technical effects of this utility model compared to the prior art are:

[0017] 1. This utility model includes a guiding structure between the jaw holder and the connecting rod pin. This guiding structure guides the connecting rod pin and regulates forces acting outside its direction of movement. When the jaws experience force deviation, the first or second guide surface of the guide protrusion abuts against the side wall of the guide groove and regulates the direction, ensuring the rotational stability of the first and second jaws and preventing deflection when the first and second jaws are subjected to uneven forces, thus making the jaws more evenly stressed. Furthermore, it ensures the consistency of the push rod and piston rod movement, preventing piston misalignment and scratching the side wall of the piston chamber, and increasing the service life of the cylinder.

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

[0019] 3. The present invention provides connecting rod retaining rings on 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 restricting the lateral movement of the first connecting rod / second connecting rod. This structure has the advantages of convenient installation and low cost.

[0020] 4. The plier head holder of this utility model has at least one mounting window that allows the push rod to enter. The push rod mounting part is provided with a push rod mounting hole, and a guide washer is provided on the push rod mounting hole. Through the separate design of the plier head holder and the guide washer, the machining accuracy is higher, and the friction with the push rod can be reduced. Even if the guide washer wears, only the guide washer needs to be replaced, reducing maintenance costs. At the same time, the push rod is installed onto the plier head holder at an angle through the mounting window. Compared with the original assembly method of placing the push rod parallel to the axial direction of the push rod mounting hole in the mounting window, this can reduce the length of the mounting window and the mounting cavity of the plier head holder, thereby reducing the size of the plier head holder, reducing the weight of the component, and improving assembly efficiency. Attached Figure Description

[0021] Figure 1 This is a structural schematic diagram of the cutting tool of this utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the cutting pliers head of this utility model.

[0023] Figure 3 This is a schematic diagram of the structure of the cutting pliers head with the hidden pliers head base of this utility model.

[0024] Figure 4 This is a cross-sectional view of the cutting pliers head of this utility model.

[0025] Figure 5 This is an exploded view of the cutting pliers head of this utility model.

[0026] Figure 6 This is a partial sectional view of the quick-change connection device of this utility model.

[0027] Figure 7 yes Figure 6 Sectional view at point AA.

[0028] Figure 8 This is a structural schematic diagram of a portion of the quick-change connection device on the drive unit of this utility model.

[0029] Figure 9 yes Figure 7 Sectional view at point BB.

[0030] The meaning of the labels in the diagram:

[0031] 1. Cutting pliers head; 2. Drive unit; 3. Quick-change connection device; 4. Housing; 5. Battery pack;

[0032] 11. Clamp head seat; 111. Clamp body mounting part; 112. Push rod mounting part; 1121. Push rod mounting cavity; 113. Guide groove; 114. Connecting rod pin assembly hole; 115. Mounting window; 116. Guide washer; 117. Display mark; 12. First clamp body; 121. Guide block; 13. Second clamp body; 14. First connecting rod; 15. Second connecting rod; 16. Push rod; 161. Connecting rod mounting part; 1611. Mounting rib; 1612. Mounting base; 162. Push rod spring; 163. Spring retaining ring; 17. Connecting rod pin; 171. Connecting rod retaining ring; 172. Clamp head pin assembly; 18. Clamp head pin; 181. Receiving cavity; 1812. First external thread; 182. Locking stop block; 1821. Partial external thread; 1822. Positioning pin; 183. Locking screw; 184. Clamp head pin nut; 19. Protective cover.

[0033] Cylinder block 21; Connecting seat 22; Connecting screw 221; Sliding sleeve mounting 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 part 32; First push rod connecting part 321; Second push rod connecting part 322; Locking assembly 33; Locking member 331; Locking spring 332; Locking limiting member 333; Sliding sleeve 34; Sliding sleeve pushing part 341; Clearance groove part 342; Sliding sleeve limiting groove 343; Sliding sleeve limiting member 344; Sliding sleeve spring 35; Limiting pin 36; Insertion part 37; Axial limiting protrusion 371; Limiting pin hole 372; Insertion groove 38; Axial limiting groove part 381; Axial installation clearance 382; Orientation limiting part 383;

[0035] Power switch 41. Detailed Implementation

[0036] The present invention will be further described below with reference to specific embodiments:

[0037] Example 1:

[0038] like Figure 1 As shown, a cutting tool includes a cutting pliers head 1, a drive unit 2, a battery pack 5, and a housing 4.

[0039] A drive device 2 is installed inside the housing 4. One end of the drive device 2 extends out of the housing 4 and is connected to the cutting pliers head 1. A power switch 41 and a battery pack 5 are installed 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 cutting pliers head 1 to work.

[0040] like Figure 2-5As shown, the cutting pliers head includes a plier head base 11, a first plier body 12, a second plier body 13, a plier 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 clamp head seat 11 has a clamp body mounting part 111 and a push rod mounting part 112. The push rod mounting part 112 is generally cylindrical and has a push rod mounting hole for mounting a push rod 16 in the middle. The push rod 16 is movably disposed in the push rod mounting hole. The push rod 16 has a push rod body part and a connecting rod mounting part 161 that connects the first connecting rod 14 and the second connecting rod 15.

[0042] The clamp body mounting part 111 consists of two connecting arms symmetrically arranged on the end face of the push rod mounting part 112. The connecting arms are integrally formed with the clamp body mounting part 111. An installation space for mounting the first clamp body 12 and the second clamp body 13 is formed between the ends of the two connecting arms, and a clamp head pin mounting hole is provided. A clamp head pin assembly 18 is provided in the clamp head pin mounting hole. The first clamp body 12 and the second clamp body 13 are rotatably mounted on the clamp body mounting part 111 through the clamp head pin assembly 18.

[0043] like Figure 3 As shown, the front ends of the first clamp body 12 and the second clamp body 13 have blades that cooperate to form jaws. One of the blades is also equipped with a guide block 121, which has a blade guide groove. When the jaws close, the other blade contacts the side wall of the blade guide groove in advance to prevent the first clamp body 12 and the second clamp body 13 from being misaligned and deformed, thus ensuring the cutting quality.

[0044] The rear end of the first clamp body 12 is hinged to at least one first link 14, and the rear end of the second clamp body 13 is hinged to at least one second link 15. The first link 14 and the second link 15 are connected to the link mounting part 161 by a link pin 17.

[0045] In this embodiment, two first connecting rods 14 are symmetrically arranged at the rear end of the first clamp body 12, and two second connecting rods 15 are symmetrically arranged at the rear end of the second clamp body 13. Specifically, both ends of the first connecting rods 14 and the second connecting rods 15 are provided with first pin holes, and the rear ends of the first clamp body 12 and the second clamp body 13 are provided with connecting pins. One end of each of the two first connecting rods 14 and the two second connecting rods 15 is respectively installed at the end of the connecting rod pin of the corresponding clamp body through the first pin hole and is limited by a retaining spring. The connecting rod mounting part 161 has a mounting base 1612 and two mounting ribs 1611 spaced apart on the mounting base 1612. The mounting ribs 1611 are provided with second pin holes for mounting connecting rod pins 17. The connecting rod pins 17 pass through the first connecting rod 14, the mounting ribs 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 a movable fit. When the push rod 16 moves, it can drive the corresponding first clamp 12 and second clamp 13 to move through the first connecting rod 14 and the second connecting rod 15 to achieve the closing and opening of the jaws.

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

[0047] The guiding structure includes a guide groove 113 on the inner wall of the jaw holder 11 and a guide protrusion 171 at the end of the connecting rod pin 17. Specifically, guide grooves 113 are symmetrically arranged on the inner walls of the two connecting arms of the jaw holder 11, and these guide grooves 113 are arranged along the moving direction of the push rod 16. Elongated guide protrusions 171 are symmetrically arranged at both ends of the connecting rod pin 17, and each guide protrusion 171 has a first guide surface and a second guide surface that contact the guide groove 113. When the connecting rod pin 17 is positioned 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 sidewall of the guide groove 113. This ensures that the connecting rod pin 17 can only move along the direction of movement of the push rod 16. When the jaws experience force deviation, the first guide surface or the second guide surface can abut against the sidewall of the guide groove 113 and regulate the direction, ensuring the rotational stability of the first jaw 12 and the second jaw 13, preventing the first jaw 12 and the second jaw 13 from deflecting when the force is uneven, and making the jaws more evenly stressed. In addition, it can also ensure the consistency of movement of the push rod and the piston rod, prevent piston deviation from scratching the sidewall of the piston chamber, and increase the service life of the cylinder.

[0048] To facilitate the installation of the connecting rod pin 17, at least one connecting rod pin assembly hole 114 is provided on the side wall of the plier head seat 11. In this embodiment, corresponding connecting rod pin assembly holes 114 are provided on the two connecting arms respectively. The inner diameter of the connecting rod pin assembly hole 114 is adapted to or slightly larger than the outer diameter of the connecting rod pin 17. The connecting rod pin 17 can quickly enter the mounting cavity of the plier head seat 11 (i.e., the mounting space between the two connecting arms) 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 part 161, thereby greatly improving the assembly efficiency.

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

[0050] To prevent the first connecting rod 14 / second connecting rod 15 from detaching or shifting, connecting rod retaining rings 172 are provided on 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 / second connecting rod 15, and the other side abuts against the side wall of the jaw holder 11 (i.e., the inner surface of the connecting arm), thereby restricting the lateral movement of the first connecting rod 14 / second connecting rod 15. This structure has the advantages of convenient installation and low cost. In addition, the connecting rod retaining ring 172 is designed as a boss shape. The larger end contacts the first connecting rod 14 / second connecting rod 15, which can increase the contact area with the first connecting rod 14 / second connecting rod 15 and make the installation more stable; the smaller end contacts the jaw holder 11, which can reduce the contact area with the jaw holder 11 and reduce the sliding friction.

[0051] In this embodiment, an installation space for mounting the first clamp 12 and the second clamp 13, and an installation cavity for mounting 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 push rod 16 (mainly the mounting base 1612), so that the push rod 16 cannot enter the installation cavity through the installation space.

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

[0053] To facilitate the sliding of the push rod 16 on the clamp head seat 11, this embodiment provides a guide washer 116 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 outer periphery of the guide washer 116 has a stepped 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] To reduce the overall length of the clamp head seat 11, the length of the mounting window 115 in this embodiment is also less than the length of the push rod 16. 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 there must be a certain gap between them. In this embodiment, when the push rod 16 enters the push rod mounting hole at an angle through the mounting window 115, and after the connecting rod mounting part 161 of the push rod 16 enters the mounting cavity, the push rod 16 can be axially arranged in the push rod mounting hole. Then, the guide washer 116 is fitted 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 mating installation of the three components. The inner diameter of the push rod mounting hole is mainly determined by the size of the push rod 16 and the angle of tilt installation, but it is smaller than the outer diameter of the mounting base 1612. The mounting base 1612 can abut against the end face of the push rod mounting hole and limit the extreme position of the push rod 16's retraction.

[0055] In addition, the push rod 16 can be slidably mounted on the guide washer 116. The guide washer 116 facilitates the tilted installation of the push rod 16 and provides guidance and support 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 pliers head seat 11 and reduces maintenance costs.

[0056] The push rod mounting part 112 is also provided with a push rod mounting cavity 1121 that communicates with the push rod mounting hole, and 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 from the open side of the push rod mounting cavity 1121 and is installed on the push rod mounting hole, so that the push rod 16 can be movably disposed in the push rod mounting part 112.

[0057] Preferably, a protective cover 19 is provided on the outside of the mounting window 115. The protective cover 19 can cover the plier head seat 11 and the tail of the first plier body 12 and the second plier body 13, preventing fingers or other objects from accidentally entering the mounting cavity of the plier head seat 11, and protecting the operator and ensuring normal use of the tool. At the same time, the protective cover 19 covers the outside of the connecting rod pin mounting hole 114, further preventing the connecting rod pin 17 from falling off, and also has an aesthetic effect.

[0058] The outer end of the push rod body of push rod 16 is also provided with push rod spring 162 and spring retainer ring 163. One end of push rod spring 162 abuts against guide washer 116, and the other end abuts against spring retainer ring 163. Spring retainer ring 163 is mounted on push rod body via retainer ring snap. Under the action of push rod spring 162, push rod 16 can automatically return to its original position. At the same time, the stroke of push rod 16 is limited by push rod spring 162.

[0059] In addition, the outer diameter of the stepped 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 inserted into the push rod mounting hole, the stepped portion of the guide washer 116 abuts against the end wall of the push rod mounting hole under the action of the push rod spring 162, 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 mounting cavity 1121, and the inner diameter of the spring retaining ring 163 is adapted to the outer diameter of the push rod body of the push rod 16, thereby sealing the push rod mounting cavity 1121 and preventing impurities from entering when the shearing pliers head 1 is stored separately; at the same time, the spring retaining ring 163 can also play a guiding and supporting role when the push rod 16 moves.

[0061] like Figure 4 , 5 As shown, the first clamp body 12 and the second clamp body 13 are mounted on the clamp body mounting part 111 via a clamp head pin assembly 18. The clamp head pin assembly 18 includes a clamp head pin 181, a locking stop 182, a locking screw 183, and a clamp head pin nut 184. One end of the clamp head pin 181 is provided with a retaining edge, and the other end is provided with a first external thread 1812 and a receiving cavity 1811 for installing the locking stop 182. The receiving cavity 1811 penetrates the side wall where the first external thread 1812 is located. In this embodiment, the receiving cavity 1811 is generally shaped like a slot that penetrates the side wall, and a locking screw positioning hole is opened at the bottom of the slot.

[0062] The locking block 182 has symmetrically extended stops on both sides. The outer side wall of the stops has a partial external thread 1821 that matches the shape of the first external thread 1812. The end face of the locking block 182 has an axially extended locating pin 1822 that matches the inner diameter of the locking screw locating hole. The locking block 182 has a threaded hole in the middle that passes through the locating pin 1822. The locking screw 183 is installed in the threaded hole.

[0063] After the locking block 182 is inserted into the receiving cavity 1811, it is positioned and engaged with the pliers pin 181 via the positioning pin 1822. The partial external thread 1821 can fill the gap of the first external thread 1812, and the locking screw 183 can abut against the end face of the receiving cavity 1811, that is, against the end face of the locking screw positioning hole. When the pliers pin nut 184 is installed on the first external thread 1812 of the pliers pin 181, it will simultaneously be threaded onto the partial external thread 1821 of the locking block 182. At this time, by adjusting the locking screw 183, the locking block 182 is driven to move relative to the pliers pin 181, so that resistance is generated between the locking block 182 and the pliers pin nut 184, thereby preventing the pliers pin nut 184 from loosening. When disassembly is required, simply reverse the adjustment of the locking screw 183 so that it is away from the end face of the locking screw positioning hole. This will release the resistance between the locking block 182 and the pliers head pin nut 184, allowing the pliers head pin nut 184 to be easily disassembled.

[0064] like Figure 6-7 As shown, the drive device 2 includes a cylinder body 21, a connecting seat 22, and a piston assembly 23. The connecting seat 22 is threaded 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 detaching 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 has a piston rod 231, a piston 232, and a piston spring 233 fitted around the outside of the piston rod 231. One end of the piston rod 231 is separately disposed from or integrally formed with the piston 232. The other end of the piston rod 231 extends out of the connecting seat 22 and has a flange extending from this end. The flange is used to limit the axis of the piston rod 231, preventing the piston rod 231 from entering the piston chamber completely. In this embodiment, to prevent the piston rod 231 from rotating, a piston limiting groove 2311 is provided on the side wall of the piston rod 231. A piston limiting pin 234 is fixed on the cylinder body 21. One end of the piston limiting pin 234 cooperates with the piston limiting groove 2311, so that the piston rod 231 can only move axially.

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

[0067] The quick-change clamp head connection mechanism includes a sliding sleeve 34, a sliding sleeve spring 35, at least one limit pin 36, a plug-in portion 37 provided on the clamp head seat 11, and a plug-in groove 38 provided on the connecting seat 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. The outer wall of the plug-in portion 37 is provided with a plurality of circumferentially evenly distributed axially limiting protrusions 371. In this embodiment, there are three sets of axially limiting protrusions 371, each set having the same structure, that is, each axially limiting protrusion 371 includes multiple axially arranged axially limiting protrusions. For example... Figure 8 As shown, the connecting seat 22 has a plug groove 38 that matches the shape of the plug part 37. The inner wall of the plug groove 38 has an axial limiting groove 381 that matches the shape of the axial limiting protrusion 371. The axial limiting groove 381 is divided into three groups, and each group of axial limiting grooves has several axial limiting grooves that can accommodate the corresponding axial limiting protrusion. An axial installation gap 382 is formed between two adjacent axial limiting grooves 381 to accommodate the axial limiting protrusion 371. During installation, the axial limiting protrusion 371 of the plug part 37 is aligned with the axial installation gap 382 and enters the plug groove 38. Then, the plug part 37 is rotated to allow the axial limiting protrusion 371 to enter the corresponding axial limiting groove 381, thereby achieving axial positioning between the clamp head seat 11 and the connecting seat 22.

[0069] like Figure 9 As shown, to limit the circumferential position of the insertion part 37 within the insertion groove 38, at least one through-hole is provided in the side wall of the insertion groove 38. Each through-hole is provided with a stepped limiting pin 36, the length of which is greater than the length of the through-hole. A corresponding limiting pin hole 372 is provided at the corresponding position of the insertion part 37. When the insertion part 37 is installed in place, the limiting pin 36 can extend out of the through-hole and enter the limiting pin hole 372 to achieve circumferential positioning of the insertion part 37.

[0070] In this embodiment, each set of axial limiting protrusions 371 corresponds to two limiting pins 36. A limiting pin hole 372 is formed on the corresponding axial limiting protrusion of the axial limiting protrusion 371. One limiting pin 36 engages with the limiting pin hole 372, and the other limiting pin hole 372 engages with one end face of the axial limiting protrusion to achieve reverse limiting. Additionally, each axial limiting groove 381 has a directional limiting part 383 at its end, which engages with the other end face of the axial limiting protrusion. Simultaneously, the directional limiting part 383 also ensures the directional rotational installation of the insertion part 37. Figure 9 As shown, the connector 37 can only enter the installation position clockwise and leave the installation position counterclockwise.

[0071] In this embodiment, the limiting pin 36 is locked and unlocked by the sliding sleeve 34. Figure 7As shown, the sliding sleeve 34 is movably fitted onto 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 pushing part 341 and a clearance groove part 342. The connecting seat 22 is provided with a sliding sleeve mounting protrusion 222. The sliding sleeve spring 35 abuts against the end wall of the sliding sleeve mounting protrusion 222 and the sliding sleeve pushing part 341. At the same time, the other end of the sliding sleeve 34 and the connecting seat 22 are limited by a retaining ring. Under the action of the sliding sleeve spring 35, the sliding sleeve 34 is abutted against the retaining ring. At this time, the sliding sleeve pushing part 341 is located outside the stepped hole and can abut against the outer end of the limiting pin 36, so that the inner end of the limiting pin 36 is always engaged with the limiting pin hole 372. When the circumferential limit needs to be engaged, the sliding sleeve 34 moves under the action of external force, so that the clearance groove 342 is located outside the stepped hole, and the limit pin 36 can move freely in the clearance groove 342. After the clamp head seat 11 rotates, it can drive the limit pin 36 to move outward, unlocking the circumferential position.

[0072] To allow users to better control the distance of pressing the slide sleeve 34, at least one slide sleeve limiting groove 343 is provided at the lower end of the inner wall of the slide sleeve 34. The depth of the slide sleeve limiting groove 343 is set according to the moving distance of the slide sleeve 34. A corresponding slide sleeve limiting member 344 is installed on the slide sleeve mounting protrusion 222. The slide sleeve limiting member 344 is preferably a steel ball. The steel ball can limit the distance that the slide sleeve 34 is pressed down through the end face of the slide sleeve limiting groove 343. This distance is just enough to ensure that the slide sleeve pushing part 341 leaves the stepped hole. At this time, the slide sleeve spring 35 is not over-compressed, and the pressing intensity of the user can be effectively reduced.

[0073] Preferably, such as Figure 1 , 5 As shown, a display mark 117 indicating that the shearing pliers head is installed correctly is provided at the connection between the protective cover 19 and the cylinder 21 or at the connection between the pliers head seat 11 and the cylinder 21. This display mark 117 is either a dot or an arrow. When two display marks are aligned, it indicates that the shearing pliers head is installed correctly. In this embodiment, the protective cover 19, the cylinder 21, and the pliers head seat 11 are each provided with three evenly distributed display marks 117, which facilitates checking whether the shearing pliers head is installed correctly 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 part 32 provided at one end of the push rod 16, and a locking component 33 radially provided in the push rod connection part 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 for limiting the locking component 33 is provided circumferentially in the middle of the first connecting section 311. A release groove 314 for the locking component 33 to disengage is formed between two adjacent limiting protrusions 313. The push rod connecting part 32 has a first push rod connecting part 321 adapted to the first connecting section 311 and a second push rod connecting part 322 adapted to the second connecting section 312. The outer diameter of the second push rod connecting part 322 is smaller than that of the first push rod connecting part 321 and smaller than that of the push rod body. When the shearing pliers head 1 is quickly installed, the outer diameter of the second push rod connecting part 322 is much smaller than the inner diameter of the first connecting section 311, which can effectively ensure the accuracy of the insertion. After the push rod connecting part 32 is fully inserted, the first push rod connecting part 321 is positioned and engaged with the first connecting section 311, and the second push rod connecting part 322 is positioned and engaged with the second connecting section 312, so as to realize the circumferential positioning of the push rod 16 and the piston rod 231, and at the same time, it can further ensure the coaxiality of the push rod 16 and the piston rod 231.

[0076] The push rod connecting part 32 is integrally or separately disposed on the outer end of the push rod body of the push rod 16. In this embodiment, the push rod connecting part 32 is integrally formed with the push rod body, which can ensure the coaxiality of the two.

[0077] like Figure 6 As shown, the second push rod connecting part 322 has a locking hole radially opened, and a locking assembly 33 is movably disposed in the locking hole. The locking assembly 33 includes a locking member 331, a locking spring 332, and a locking limit member 333 installed in the locking hole. Specifically, an installation protrusion ring is provided extending from the inner wall of the locking hole. The locking member 331 is movably disposed in the installation protrusion ring and can be fully inserted into the locking hole. One end of the locking member 331 is limited by the locking limit member 333 (priority snap ring), and the other end is provided with a locking spring 332. The locking spring 332 abuts against the spring abutment protrusion of the installation protrusion ring and the locking member 331, and can drive one end of the locking member 331 to extend out of the locking hole, thereby cooperating with the limiting protrusion 313 to perform axial limiting, and realize the axial positioning of the push rod 16 and the piston rod 231.

[0078] In addition, the drive device 2 also includes a hydraulic mechanism for driving the piston assembly 23. The hydraulic mechanism has an oil bag, an inlet check valve, a plunger assembly, an outlet check valve, a pressure relief valve, and a motor assembly. The rear end of the cylinder body 21 is provided with an oil inlet channel and an oil return channel that connect the oil bag and the piston chamber. An inlet check valve, a plunger assembly, and an outlet check valve are arranged in sequence on the oil inlet channel. A pressure relief valve is arranged on the oil return channel. The motor assembly drives the plunger assembly to reciprocate to inject oil into the piston chamber, so as to extend the piston rod 231. At the same time, the push rod 4 is synchronously reset and drives the jaws to close. When the pressure in the piston chamber reaches the threshold, the pressure relief valve automatically opens to release pressure and return oil. The piston assembly 23 is automatically reset under the action of the piston spring 233. At the same time, the push rod 4 is synchronously reset and drives the jaws to open.

[0079] Example 2:

[0080] This embodiment is basically the same as embodiment one, except that: this embodiment is a fixed installation method for the shearing pliers head 1, which is fixed on the drive device 2.

[0081] Specifically, the drive device 2 includes a cylinder 21, one end of which has a piston chamber. The jaw seat 11 of the shearing pliers 1 is threadedly connected to the end of the cylinder 21 where the piston chamber is located. The push rod 16 extends into the piston chamber and connects to the piston 232. A piston spring 233 is fitted on the outside of the push rod 16. The piston spring 233 abuts against the piston 232 and the jaw 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 Embodiment 1, except that:

[0084] The guiding structure of this embodiment includes a guide protrusion 171 provided on the inner wall of the plier head seat 11 and a guide groove 113 provided at the end of the connecting rod pin 17. Specifically, elongated guide protrusions 171 are symmetrically provided on the inner walls of the two connecting arms. The guide protrusions 171 are arranged along the moving direction of the push rod 16. Guide grooves 113 are symmetrically provided at both ends of the connecting rod pin 17. The connecting rod pin 17 is slidably mounted on the guide protrusions 171 through the guide grooves 113.

[0085] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A cutting tongs head, characterized in that, include: The clamp head base (11) has a clamp body mounting part (111) and a push rod mounting part (112); The first clamp body (12) and the second clamp body (13) are rotatably mounted on the clamp body mounting part (111). The front ends of the first clamp body (12) and the second clamp body (13) cooperate with each other to form a clamp jaw. The rear end of the first clamp body (12) is hinged to at least one first connecting rod (14), and the rear end of the second clamp body (13) is hinged to at least one second connecting rod (15). A push rod (16) is movably disposed within the push rod mounting portion (112) and has a connecting rod mounting portion (161); and Link pin (17) is used to connect the first link (14) and the second link (15) to the link mounting part (161); A guide structure is provided between the clamp head seat (11) and the connecting rod pin (17). This guide structure can guide the connecting rod pin (17) and regulate the force outside its direction of movement.

2. The cutting tongs head of claim 1, wherein: The guiding structure includes a guide groove (113) provided on the inner wall of the plier 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) disposed on the inner wall of the caliper head seat (11) and a guide groove (113) disposed at the end of the connecting rod pin (17).

3. A cutting tine according to claim 2, wherein: The guide grooves (113) are symmetrically arranged on the inner wall of the clamp head seat (11); The connecting rod pin (17) has elongated guide protrusions (171) symmetrically arranged at both ends. Each guide protrusion (171) has a first guide surface and a second guide surface that contact the guide groove (113).

4. A cutting tine according to any one of claims 1 to 3, wherein: At least one connecting rod pin assembly hole (114) is provided on the side wall of the plier head seat (11). The connecting rod pin (17) can quickly enter the mounting cavity of the plier 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 part (161).

5. A cutting pliers head according to any one of claims 1-3, characterized in that: The clamp body mounting part (111) has a mounting cavity and mounting windows (115) on both sides of the mounting cavity; The rear end of the first clamp (12) is symmetrically provided with two first connecting rods (14), and the rear end of the second clamp (13) is symmetrically provided with two second connecting rods (15). The first connecting rods (14) and the second connecting rods (15) respectively enter the mounting cavity through the corresponding mounting window (115). The connecting rod mounting part (161) has two mounting ribs (1611) spaced apart, and 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), the mounting rib (1611) and the other second connecting rod (15) in sequence. The outermost ends of the connecting rod pin (17) are provided with connecting rod retaining rings (172). One side of the connecting rod retaining ring (172) abuts against the first connecting rod (14) / second connecting rod (15), and the other side abuts against the side wall of the pliers head seat (11).

6. The cutting tongs head of claim 1, wherein: The push rod mounting part (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 mounted in the push rod mounting part (112) through the guide washer (116).

7. A cutting tine according to any one of claims 1 to 3, wherein: The first clamp body (12) and the second clamp body (13) are mounted on the clamp body mounting part (111) via a clamp head pin assembly (18), which includes a clamp head pin (181), a locking stop (182), a locking screw (183), and a clamp head pin nut (184). One end of the pliers pin (181) is provided with a retaining edge, and the other end is provided with a first external thread (1812) and a receiving cavity (1811) for installing the locking block (182). The receiving cavity (1811) penetrates the side wall where the first external thread (1812) is located. The locking block (182) has a threaded hole in the middle. After the locking screw (183) is installed in the threaded hole, it can abut against the end face of the receiving cavity (1811). The outer side wall of the locking block (182) has a partial external thread (1821) that matches the shape of the first external thread (1812). The plier pin nut (184) is threadedly connected to both the first external thread (1812) and the partial external thread (1821). The locking stop (182) is driven to move relative to the plier pin (181) by adjusting the locking screw (183) to prevent the plier pin nut (184) from loosening.

8. A shearing tool characterized by, include: Cutting pliers head (1), as described in any one of claims 1-7; as well as The drive device (2) is connected to the shearing head (1) and is used to drive the push rod (16) to move and enable the shearing head (1) to work.

9. A cutting tool according to claim 8 wherein: The shearing pliers (1) is detachably mounted on the drive device (2) via a quick-change connecting device (3). The drive device (2) includes a cylinder (21), a connecting seat (22) and a piston assembly (23). A piston chamber is formed between the cylinder (21) and the connecting seat (22). The piston assembly (23) is provided in the piston chamber and has a piston rod (231) that can extend out of the connecting seat (22). The quick-change connection device (3) includes a plier quick-change connection mechanism disposed between the plier head seat (11) and the connecting seat (22) and a push rod quick-change connection mechanism disposed between the push rod (16) and the piston rod (231).

10. A cutting tool according to claim 9, wherein: 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 part (32) disposed at one end of the push rod (16), and a locking component (33) radially disposed in the push rod connection part (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 component (33) is provided circumferentially in the middle of the first connecting section (311). A release groove (314) for the locking component (33) to disengage is formed between two adjacent limiting protrusions (313). The push rod connecting part (32) has a first push rod connecting part (321) adapted to the first connecting section (311) and a second push rod connecting part (322) adapted to the second connecting section (312), thereby realizing the circumferential positioning of the push rod (16) and the piston rod (231); The second push rod connecting part (322) has a locking hole in the radial direction. The locking component (33) is movably disposed in the locking hole, which can extend out of the locking hole and cooperate with the limiting protrusion (313) to limit the movement.

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