Caliper type structure extrusion tool

Abstract

The utility model relates to the technical field of connecting or detaching objects in press fit, in particular to a clamping installation tool. According to the technical scheme, the extrusion tool of the caliper type structure comprises an upper arm and a lower arm, the middle section of the upper arm is connected with the middle section of the lower arm through a clamping plate, a plurality of gears are arranged in the clamping plate, and the tail ends of the upper arm and the lower arm are connected with the two ends of a hydraulic cylinder; the front end of the upper arm and the front end of the lower arm are each provided with a detachable wear-resisting shaft and an extrusion nozzle installed on the wear-resisting shaft. The utility model provides an extrusion tool with a caliper type structure, which solves the problems of complicated operation, high cost, easiness in damage and difficulty in maintenance in the prior art, and achieves the purposes of simplicity and convenience in operation, strong adaptability, convenience in disassembly and replacement of a wear-resistant shaft, convenience in processing, low maintenance cost, difficulty in damage of a gear and prevention of personnel injury.

Description

Technical Field

[0001] The utility model relates to the technical field of objects used for connecting or removing press-fit, in particular to a clamping installation tool. Background Art

[0002] In the production field such as construction, it is often necessary to connect metal wires. For example, in construction, the problem of connecting steel bars to each other is often encountered. Generally, welding is used to weld the ends of two adjacent steel bars together. Welding requires the use of welding equipment. Construction sites are often operated at high altitudes. Due to the space limitations of the construction site, it is very difficult to use welding equipment, there are huge safety hazards, welding consumes a lot of energy, and causes great pollution to the environment. In addition, the welded interface is not strong enough and is prone to rust and cracking. In recent years, a welding-free steel bar connection device has emerged. When using this connection device to connect two steel bars together, it is necessary to push the two cone sleeves of the connection device toward each other in order to firmly connect the steel bars. At present, the pressure clamp that pushes the two cone sleeves of the connection device is limited in the pressure stroke of the existing pressure clamp. When the distance between the two cone sleeves is too large, it will be impossible to apply pressure. That is, the two cone sleeves cannot be placed between the two clamp heads of the pressure clamp, which brings inconvenience to the use of the welding-free steel bar connection device and affects the connection efficiency. For example, the utility model disclosed herein relates to the field of steel bar connection technology, and in particular to a clamp head structure and a clamping installation tool. The present invention can transfer external force to the axis of the rod through two clamp rods, achieving strong extrusion on the axis of the rod; through the meshing fan-shaped teeth, the first clamp rod and the second clamp rod can be synchronously and symmetrically rotated around their respective lock axes to maintain the stability of the working shape during crimping. The fixed pressure head can achieve pre-compression of small loads; the movable pressure head can swing relative to the fixed pressure head, which can ensure that the working surfaces of the movable pressure heads on the two clamp rods are always parallel to each other during work; the telescopic device installed by the hinge between the two clamp rods can relatively open the two clamp head structures of the two clamp rods to reach a pre-extrusion state, or relatively close to achieve the pressing of the cone sleeve of the connecting device, and complete the synchronous axial advancement of the two cone sleeves of the connecting device in two steps through the fixed pressure head and the swinging pressure head. However, the above-mentioned clamp head structure and clamping installation tool do not use a hydraulic cylinder as a telescopic device, nor do they innovate the connection structure between the upper and lower arms, resulting in easy damage and high cost. Utility Model Content

[0003] The utility model solves the problems of complex operation, high cost, easy damage and difficult maintenance in the prior art. The utility model proposes a caliper-type structure extrusion tool, which achieves the purposes of simple operation, strong adaptability, convenient disassembly and replacement of wear-resistant shafts, convenient processing, low maintenance cost, gears not easily damaged and prevention of personal injury.

[0004] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A caliper-type extrusion tool includes an upper arm and a lower arm. The middle section of the upper arm is connected to the middle section of the lower arm by a splint. Several gears are provided in the splint. The ends of the upper arm and the lower arm are connected to the two ends of a hydraulic cylinder. The front ends of the upper arm and the lower arm are both provided with a detachable wear-resistant shaft and an extrusion nozzle installed on the wear-resistant shaft.

[0006] The advantage of this design is that the hydraulic cylinder provides a strong driving force to enhance the extrusion ability of the splint, while the detachable wear-resistant shaft and extrusion nozzle are easy to replace and maintain, thereby improving the service life and efficiency of the tool.

[0007] Preferably, the hydraulic cylinder includes a cylinder body and a piston rod, the cylinder body is provided with an orifice, the upper end of the outer wall is provided with a first sealing groove and an external thread, and the lower end is provided with an oil inlet and a through hole; the hydraulic cylinder is connected to the cylinder cover by a thread, one side of the inner wall of the cylinder cover is provided with a second sealing groove, a guide groove and a dustproof groove, the other side is provided with an internal thread, and the outer wall is provided with an oil return port; the head of the piston rod is provided with a third sealing groove and a threaded hole, and the tail is provided with a through hole.

[0008] The advantage of this design is that, through the application of multiple sealing grooves and guide grooves, the sealing and guiding properties of the hydraulic system are ensured, hydraulic oil leakage is effectively prevented, and the reliability and stability of the entire system are enhanced.

[0009] Preferably, the piston rod head is provided with an adaptive piston and piston pad, the outer wall of the piston is provided with a fourth sealing groove, the piston head is installed with a piston cover, the end face of the piston cover is provided with a screw countersunk hole, a buffer chamber is provided between the piston cover and the cylinder body, and the piston pad, the piston and the piston cover are fixed to the piston rod by screws.

[0010] The advantage of this design is that the buffer chamber can slow down the movement of the piston and avoid mechanical damage caused by high-speed impact. At the same time, the setting of the piston pad protects the sealing ring from being stretched, thereby enhancing the durability and stability of the entire hydraulic system.

[0011] Preferably, a guide ring is provided in the cylinder body to cooperate with the movement of the piston rod, and the guide ring is assembled on the guide groove. Sealing rings are provided in the first sealing groove, the second sealing groove, the third sealing groove and the fourth sealing groove, and a dust ring is also provided on the outermost side of the cylinder cover.

[0012] The advantage of this design is that the guide ring helps the piston rod move smoothly in the cylinder body, reducing wear; and the use of sealing rings and dust rings further improves the sealing and dustproof properties of the system, ensuring long-term and stable operation of the hydraulic system.

[0013] Preferably, the upper arm and the lower arm are both provided with a splint through-hole and a hydraulic cylinder through-hole, the upper arm tooth profile is provided below the middle section of the upper arm, the lower arm and the upper arm are mirror images of each other except for the tooth profile, the lower arm tooth profile is provided above the middle section of the lower arm, the number of teeth of the upper arm tooth profile near the front end of the upper arm is more than the number of teeth near the end of the upper arm, and the lower arm tooth profile is symmetrically distributed.

[0014] The advantage of this design is that, through the precise gear and tooth profile design, the synchronous movement and precise control of the upper and lower arms are ensured, which improves the operating accuracy and reliability of the extrusion tool.

[0015] Preferably, the center of the gear is provided with a gear through hole for assembling a graphite copper sleeve, the splint is provided with a splint through hole for assembling a pin shaft, and the side is provided with a threaded hole for installing a side plate.

[0016] The benefits of this design are that the use of graphite copper sleeves can reduce friction between the gears and the pins, extending the service life of the components while facilitating maintenance and replacement. The threaded holes on the side facilitate the installation of the side panels, enhancing the stability and durability of the entire tool structure.

[0017] Preferably, the side plates are rectangular in structure and are fixed to both sides of the splint with screws. The pin head is provided with a retaining ring groove for assembling an elastic retaining ring for the shaft and a pin through hole, and the pin through hole is equipped with a cotter pin.

[0018] The advantage of this design is that the fixed side panels prevent the gears and other moving parts from being intruded by foreign objects or dust during operation, protecting the internal structure from damage. The use of elastic rings and cotter pins ensures the reliability of the pin fixation, facilitating quick disassembly and maintenance.

[0019] Preferably, the splint through-hole, the hydraulic cylinder through-hole, the pin through-hole and the splint through-hole are all provided with graphite copper sleeves, and the pin passes through the splint through-hole and the graphite copper sleeves in the upper arm, the lower arm and the gear.

[0020] The advantage of this design is that the application of graphite copper sleeves in all through holes and moving joints reduces friction and wear, provides good lubrication, thereby protecting the pins and related components and extending the service life of the tool.

[0021] Preferably, the arc surface of the wear-resistant shaft is provided with an adaptive countersunk hole, and the wear-resistant shaft is fixed to the semi-circular arc surface position of the upper arm and the lower arm by screws; the extrusion nozzle adopts an upper and lower step-by-step layered type, and has a U-shaped structure. An extrusion nozzle pressure plate is provided between the wear-resistant shaft and the extrusion nozzle, and the extrusion nozzle pressure plate is shaped like an isosceles triangle structure. The extrusion nozzle pressure plate fixes the extrusion nozzle to the wear-resistant shaft by screws.

[0022] The advantage of this design is that the wear-resistant shaft and extrusion nozzle can effectively transmit and withstand pressure, ensuring the precision and efficiency of extrusion. The fixing method of the wear-resistant shaft and the layered design of the extrusion nozzle also facilitate the replacement and maintenance of components.

[0023] Preferably, the upper arm is further provided with a lifting hole, which is located at the center of mass and is fixed with a lifting ring via a thread.

[0024] The advantage of this design is that by setting a lifting hole on the upper arm and ensuring that it is located at the center of mass, the entire device can be easily lifted, making the transportation and installation process simpler and safer. At the same time, it ensures the balance of the tool during lifting and avoids accidental damage caused by imbalance.

[0025] Compared with the prior art, the beneficial effects of the present invention are:

[0026] 1. The powerful drive provided by the hydraulic cylinder in this utility model ensures the powerful extrusion capability of the splint, enabling efficient and precise extrusion regardless of the hardness or texture of the material. Furthermore, the front ends of both the upper and lower arms are equipped with removable wear-resistant shafts and extrusion nozzles mounted on these shafts. This design greatly facilitates tool replacement and maintenance, reducing downtime caused by component wear, thereby improving overall work efficiency. Furthermore, the gear and tooth design ensures synchronized movement and precise control of the upper and lower arms, further enhancing the operating accuracy and reliability of the extrusion tool.

[0027] 2. The use of graphite copper sleeves in all through-holes and moving joints reduces friction and wear, provides excellent lubrication, and protects the pins and related components, extending the tool's service life. Furthermore, the secure side plates prevent the intrusion of foreign objects and dust from the gears and other moving parts during operation, protecting the internal structure from damage. The use of circlips and cotter pins ensures reliable pin fixation and facilitates quick assembly and disassembly for maintenance. These features significantly reduce maintenance costs and frequency.

[0028] 3. This utility model ensures the sealing and guiding properties of the hydraulic system through the use of multiple sealing grooves and guide grooves, effectively preventing hydraulic oil leakage and enhancing the reliability and stability of the entire system. The design of the buffer chamber can slow the movement of the piston, avoiding mechanical damage caused by high-speed impact. At the same time, the provision of the piston pad protects the sealing ring from being strained, thereby enhancing the durability and stability of the entire hydraulic system. In addition, the hoisting hole provided on the upper arm and its position at the center of mass facilitates overall hoisting, making the handling and installation process simpler and safer. At the same time, it ensures the balance of the tool during the hoisting process, avoiding accidental damage caused by imbalance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural schematic diagram of a caliper-type extrusion tool of the utility model.

[0030] Figure 2 The utility model is a schematic diagram of the hydraulic cylinder structure of a caliper-type structure extrusion tool.

[0031] Figure 3 This is a half-section schematic diagram of the hydraulic cylinder structure of a caliper-type structure extrusion tool of the utility model.

[0032] Figure 4 This is a half-section schematic diagram of the gear of a caliper-type structure extrusion tool of the utility model.

[0033] Figure 5 This is a partial enlarged view of the gear part of a caliper-type structure extrusion tool of the utility model.

[0034] Figure 6 This is a schematic diagram of the back structure of a caliper-type extrusion tool of the present invention.

[0035] Figure 7 This is a partial enlarged view of an elastic retaining ring for a shaft of a caliper-type structure extrusion tool of the utility model.

[0036] Illustrations: 1. Piston rod, 2. Cylinder head, 3. Cylinder body, 4. Piston pad, 5. Piston, 6. Piston cover, 7. Buffer chamber, 8. Lower arm, 9. Wear-resistant shaft, 10. Extrusion nozzle pressure plate, 11. Extrusion nozzle, 12. Upper arm, 13. Pin, 14. Side plate, 15. Lifting ring, 16. Hydraulic cylinder, 17. Handle, 18. Gear, 19. Graphite copper sleeve, 20. Elastic circlip for shaft, 21. Cotter pin. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the present disclosure more clearly apparent, embodiments of the present disclosure are described in further detail below with reference to the accompanying drawings. The proportions of the components are not drawn to scale, and the proportions and dimensions shown in the accompanying drawings are not intended to limit the substantial technical solutions of the present disclosure. These embodiments do not describe all details in detail, nor do they limit the present disclosure to the specific embodiments described.

[0038] See also Figure 1-7 As shown, a caliper-type structure extrusion tool includes an upper arm 12 and a lower arm 8. The middle section of the upper arm 12 is connected to the middle section of the lower arm 8 by a splint. A plurality of gears 18 are provided in the splint. The ends of the upper arm 12 and the lower arm 8 are connected to the two ends of the hydraulic cylinder 16. The front ends of the upper arm 12 and the lower arm 8 are provided with a detachable wear-resistant shaft 9 and an extrusion nozzle 11 installed on the wear-resistant shaft 9.

[0039] like Figure 1 In one embodiment shown, Figure 1 This is a structural schematic diagram of a caliper-type extrusion tool of the utility model.

[0040] The utility model designs a caliper-type structure extrusion tool characterized by its innovative structure and efficient function. The tool includes an upper arm 12 and a lower arm 8, wherein the middle section of the upper arm 12 is connected to the middle section of the lower arm 8 by a splint. Several gears 18 are provided inside the splint, and the design of these gears increases the mechanical transmission efficiency of the tool. In addition, the ends of the upper arm 12 and the lower arm 8 are connected to the two ends of the hydraulic cylinder 16, and the use of the hydraulic cylinder makes the extrusion operation more labor-saving and efficient. The front ends of the upper arm 12 and the lower arm 8 are both provided with a detachable wear-resistant shaft 9, on which an extrusion nozzle 11 is mounted. This detachable design allows for quick and easy replacement of the extrusion nozzle when it is worn during the service life of the tool, thereby improving the durability and economy of the tool.

[0041] To achieve precise positioning control, both the upper arm 12 and lower arm 8 are equipped with through-holes for the clamping plate and the hydraulic cylinder 16. Upper arm 12 features a tooth profile below its midsection, while lower arm 8 features a tooth profile above its midsection. The upper arm tooth profile has more teeth near the front end than near the rear end, while the lower arm tooth profile is symmetrically distributed. This tooth profile design ensures even distribution of extrusion force, improving operational stability and precision. Furthermore, when the hydraulic cylinder is raised or lowered at only one end, the upper arm's tooth profile perfectly matches the gears.

[0042] The center of gear 18 features a through-hole for a graphite copper sleeve 19. This sleeve reduces friction during operation and prolongs the gear's life. The plate also features a through-hole for mounting the pin 13, and threaded holes on the sides for mounting the side panels 14. The side panels are rectangular and secured to the plate with screws. The head of the pin 13 features a groove for mounting a shaft circlip 20 and a through-hole for the pin. A cotter pin 21 is mounted in the through-hole, ensuring a tight connection and stability between the components.

[0043] Graphite copper sleeves 19 are installed in the through-holes of the clamping plate, the hydraulic cylinder 16, the pin 13, and the clamping plate. The pin passes through the through-holes of the clamping plate and the graphite copper sleeves in the upper arm, lower arm, and gear. This design reduces friction between the various mechanical components and improves the durability and reliability of the tool.

[0044] The arc surface of the wear-resistant shaft 9 is equipped with matching countersunk holes and is fixed to the semi-circular arc surfaces of the upper and lower arms by screws. The extrusion nozzle 11 adopts a layered design with upper and lower steps, forming a U-shaped structure. This shape helps to better distribute the extrusion force. The extrusion nozzle pressure plate 10 is located between the wear-resistant shaft and the extrusion nozzle. It is shaped like an isosceles triangle and is fixed to the wear-resistant shaft by screws. This fixing method ensures the stability of the extrusion nozzle during operation.

[0045] The upper arm 12 is also provided with a lifting hole, which is located at the center of mass and is fixed with a lifting ring 15 by a thread. This design makes the tool more convenient during transportation and installation, and reduces the labor intensity of the operator.

[0046] In summary, this caliper-type extrusion tool demonstrates a high degree of design rationality from its structure to its functionality. The removable, wear-resistant shaft and extrusion nozzle extend the tool's service life and facilitate maintenance. The combination of a gear drive system and a hydraulic cylinder makes the extrusion operation more labor-saving and efficient. The tight connection between components and the friction-reducing design significantly enhance the tool's durability and reliability. Overall, this tool not only improves work efficiency but also reduces operational difficulty, demonstrating its broad potential for application.

[0047] like Figure 2 and Figure 3 In one embodiment shown, Figure 2 This is a schematic diagram of the hydraulic cylinder structure of a caliper-type extrusion tool of the utility model. Figure 3 This is a schematic diagram of a half-section of the hydraulic cylinder structure of a caliper-type extrusion tool according to the present invention. The design of hydraulic cylinder 16 embodies a high degree of engineering precision and functionality. The hydraulic cylinder comprises a cylinder body 3 and a piston rod 1. The cylinder body has an internal orifice, a first sealing groove and external threads at the upper end of the outer wall, and an oil inlet and through-hole at the lower end. This design ensures greater stability and sealing during installation and use.

[0048] The hydraulic cylinder is connected to the cylinder head 2 via threads. A second sealing groove, a guide groove, and a dustproof groove are located on one side of the inner wall of the cylinder head. The other side is internally threaded, and the outer wall is equipped with an oil return port. This design not only ensures the hydraulic cylinder's tightness but also provides excellent guidance and dustproofing, extending the service life of the hydraulic cylinder.

[0049] The piston rod 1 has a third sealing groove and a threaded hole at its head, and a through-hole at its tail. The piston rod head is fitted with a matching piston 5 and piston pad 4, and the outer wall of the piston has a fourth sealing groove. A piston cap 6 is mounted on the piston head, with screw counterbores on the end face of the piston cap. A buffer chamber 7 is provided between the piston cap and the cylinder body. The piston pad, piston, and piston cap are fixed to the piston rod with screws. This design ensures stable movement of the piston within the cylinder body while providing a cushioning function, reducing impact and noise.

[0050] The cylinder body also features a guide ring that coordinates with the piston rod's movement. The guide ring is mounted on a guide groove. Seals are located in the first, second, third, and fourth sealing grooves, and a dust ring is located on the outermost side of the cylinder head. These sealing and guiding features significantly enhance the performance and durability of the hydraulic cylinder.

[0051] like Figure 4-Figure 7 In one embodiment shown, Figure 4 This is a half-section schematic diagram of the gear of a caliper-type structure extrusion tool of the utility model. Figure 5 This is a partial enlarged view of the gear part of a caliper-type extrusion tool of the utility model.

[0052] , Figure 6 This is a schematic diagram of the back structure of a caliper-type extrusion tool of the utility model. Figure 7 This is a partial enlarged view of the shaft circlip of a caliper-type extrusion tool in the present invention. The caliper-type extrusion tool is assembled from a hydraulic cylinder, upper arm, lower arm, gear, clamp, side plate, pin, graphite copper sleeve, wear-resistant shaft, extrusion nozzle, extrusion nozzle pressure plate, lifting ring, handle, shaft circlip, cotter pin, hexagon socket head screw, and hexagon socket countersunk screw.

[0053] The hydraulic cylinder is assembled from a cylinder body, a cylinder head, a piston rod, a piston pad, a piston, a piston cover, a guide ring, a sealing ring, a dust ring and a hexagon socket head screw.

[0054] The cylinder body is made of round steel and needs to undergo heat treatment. Its inner wall is smooth. In order to facilitate assembly and not damage the sealing ring, the inner hole of the cylinder body should be chamfered by 20-30°. The upper end of the cylinder body wall is provided with a sealing groove and an external thread, and the lower end is provided with an oil inlet and a through hole. The through hole is used for assembling the pin.

[0055] The cylinder head is made of round steel and needs to undergo heat treatment. A sealing groove, a guide groove and a dustproof groove are provided on one side of the inner wall. The sealing groove is used for assembling the sealing ring, the guide groove is used for assembling the guide ring, and the dustproof groove is used for assembling the dustproof ring. An internal thread is provided on the other side of the inner wall. The cylinder head and the cylinder body are fixed by a threaded connection, and an oil return port is provided on the outer wall of the cylinder head.

[0056] The piston rod is made of round steel and needs to undergo heat treatment. The piston rod head is provided with a sealing groove and a threaded hole, and the piston rod tail is provided with a through hole, which is used for assembling the pin.

[0057] The piston pad is made of seamless steel pipe and needs to undergo heat treatment process. The thickness allowance is adjusted according to the assembly condition of the piston rod.

[0058] The piston is made of seamless steel pipe and needs to undergo heat treatment. A sealing groove is provided on the outer wall of the piston. In order to facilitate assembly and not damage the sealing ring, the ends of the outer wall should be chamfered 20° and the inner hole should be chamfered 45°.

[0059] The piston cover is made of round steel and needs to undergo heat treatment. The end face of the piston cover is provided with a countersunk hole for cylindrical head screws.

[0060] The piston pad, piston and piston cover are fixed to the piston rod by hexagon socket head screws to prevent them from moving.

[0061] The guide ring, also called the support ring, is a part used to support the movement of the piston or piston rod on a hydraulic cylinder or pneumatic cylinder. It can prevent the piston or piston rod from direct contact and friction with the cylinder body during movement, thereby protecting the cylinder body and the piston or piston rod from damage.

[0062] Sealing rings are used in the grooves between the cylinder body and the cylinder cover, the piston and the piston rod, the piston and the cylinder body, and the piston rod and the cylinder cover in the hydraulic cylinder. They can seal the gaps between the various components in the hydraulic cylinder to prevent oil from leaking out of the hydraulic cylinder or from the high-pressure chamber to the low-pressure chamber.

[0063] The dust ring is installed on the outermost side of the cylinder cover to prevent external dust from entering the hydraulic cylinder.

[0064] The upper arm is made of alloy structural steel and requires a heat treatment process. It has two through holes for mounting graphite copper sleeves. The upper arm has a partial gear tooth profile and a lifting hole, which is located at the center of mass of the caliper structure tool.

[0065] The lower arm and the upper arm are mirror images except for the gear part.

[0066] Gears are made of carbon steel and undergo heat treatment. A gear is a mechanical component with teeth on a rim that mesh continuously to transmit motion and power. A through hole is located in the center of the gear, which is used to mount a graphite copper sleeve.

[0067] The splint is made of a steel plate, a through hole is provided on the plate, the through hole is used to assemble the pin shaft, and a threaded hole is provided on the side, the threaded hole is used to assemble the side plate.

[0068] The side panels are made of 2-3mm steel, a rectangular structure with through-holes. They are fixed to the sides of the clamping plate with hexagon socket head screws. The side panels are protective devices to prevent foreign objects from entering the gears during movement, which could cause jamming, and to prevent accidental contact with limbs and cause injury.

[0069] The pin is made of round steel and undergoes heat treatment. The pin head features a retaining ring groove and a through-hole. The retaining ring groove is used to accommodate the shaft's circlip, while the through-hole is used to accommodate the cotter pin. The pin passes through the through-hole in the splint and through the graphite copper sleeves in the upper arm, lower arm, and gear, completing the connection between the various tool components.

[0070] Graphite copper sleeves achieve self-lubricating properties by embedding graphite particles on the surface of the sleeve. The graphite particles can form a protective film during the friction process, reducing friction damage between parts, facilitating replacement, and reducing maintenance costs.

[0071] The wear-resistant shaft is made of round steel and undergoes heat treatment. The arc surface is provided with countersunk holes for cylindrical head screws. The wear-resistant shaft is fixed to the semi-circular surface of the upper and lower arms using hexagon socket head screws.

[0072] The extrusion nozzle is made of round steel and has a U-shaped structure with upper and lower stepped layers.

[0073] The extrusion nozzle pressure plate is made of steel plate and is shaped like an isosceles triangle. It has a through hole and two countersunk holes for countersunk screws. The extrusion nozzle is fixed to the wear-resistant shafts of the upper and lower arms via hexagon socket countersunk screws, allowing the extrusion nozzle to move in a circular motion around the wear-resistant shafts.

[0074] The lifting ring is a standard part and is fixed to the upper arm lifting hole by thread. It is used to lift the caliper-type structure tool as a whole.

[0075] The handle can be made by welding or bending round steel, and can be welded or screwed to the upper and lower arms near the cylinder to provide a support position for the tool during work.

[0076] Hydraulic cylinders are equipped with a buffer device. The piston and the bottom of the cylinder form a buffer chamber (oil drain chamber). The hydraulic oil in the closed oil drain chamber can only be squeezed out through the gap, increasing the oil discharge resistance and thus slowing the movement of the piston. The purpose is to eliminate the mechanical impact between the piston and the cylinder head caused by the inertia of the moving parts and the hydraulic pressure. It also facilitates installation and reduces the risk of strain on the sealing ring during piston installation, which can affect the normal operation of the hydraulic cylinder.

[0077] The extrusion nozzle does not come into direct contact with the upper and lower arms, so no wear will occur. The wear-resistant shaft is detachable, which is convenient for maintenance and replacement.

[0078] The side plates can prevent foreign objects from entering and damaging the gears during gear movement and protect people from being injured by accidental contact.

[0079] The graphite copper sleeves in the upper and lower arms and gears can produce a protective film during the friction process, reducing friction between parts and avoiding permanent wear damage to the upper and lower arms caused by direct contact between the pins and the upper and lower arms. The graphite copper sleeves are easy to replace, reducing maintenance costs.

[0080] The present invention is not limited to the above-mentioned embodiments. Regardless of any changes in its shape or material composition, any structural design provided by the present invention is a variation of the present invention and should be considered within the scope of protection of the present invention.

Claims

1. A caliper-type extrusion tool, characterized in that: The invention comprises an upper arm (12) and a lower arm (8), wherein the middle section of the upper arm (12) is connected to the middle section of the lower arm (8) via a clamping plate, wherein a plurality of gears (18) are provided in the clamping plate, and the ends of the upper arm (12) and the lower arm (8) are connected to the two ends of a hydraulic cylinder (16), and the front ends of the upper arm (12) and the lower arm (8) are both provided with a detachable wear-resistant shaft (9) and an extrusion nozzle (11) mounted on the wear-resistant shaft (9).

2. A caliper-type structure extrusion tool according to claim 1, characterized in that: The hydraulic cylinder (16) comprises a cylinder body (3) and a piston rod (1), wherein the cylinder body (3) is provided with an orifice, the upper end of the outer wall is provided with a first sealing groove and an external thread, and the lower end is provided with an oil inlet and a through hole; the hydraulic cylinder (16) is connected to the cylinder cover (2) through a thread, and the inner wall of the cylinder cover (2) is provided with a second sealing groove, a guide groove and a dustproof groove on one side, and an internal thread on the other side, and an oil return port on the outer wall; the head of the piston rod (1) is provided with a third sealing groove and a threaded hole, and the tail is provided with a through hole.

3. A caliper-type structure extrusion tool according to claim 2, characterized in that: The head of the piston rod (1) is provided with an adapted piston (5) and a piston pad (4), the outer wall of the piston (5) is provided with a fourth sealing groove, the head of the piston (5) is mounted with a piston cover (6), the end surface of the piston cover (6) is provided with a screw countersunk hole, a buffer chamber (7) is provided between the piston cover (6) and the cylinder body (3), and the piston pad (4), the piston (5) and the piston cover (6) are fixed to the piston rod (1) by screws.

4. A caliper-type structure extrusion tool according to claim 2 or 3, characterized in that: A guide ring is also provided in the cylinder body (3) to cooperate with the movement of the piston rod (1), and the guide ring is assembled on the guide groove. The first sealing groove, the second sealing groove, the third sealing groove, and the fourth sealing groove are all provided with sealing rings. A dust ring is also provided on the outermost side of the cylinder cover (2).

5. The caliper-type structure extrusion tool according to claim 4, characterized in that: The upper arm (12) and the lower arm (8) are both provided with a splint through hole and a hydraulic cylinder (16) through hole. An upper arm tooth profile is provided below the middle section of the upper arm (12). The lower arm (8) and the upper arm (12) are mirror images of each other except for the tooth profile. A lower arm tooth profile is provided above the middle section of the lower arm (8). The number of teeth of the upper arm tooth profile near the front end of the upper arm (12) is greater than the number of teeth near the end of the upper arm (12). The lower arm tooth profile is symmetrically distributed.

6. The caliper-type structure extrusion tool according to claim 5, characterized in that: The center of the gear (18) is provided with a gear through hole for assembling the graphite copper sleeve (19), the splint is provided with a splint through hole for assembling the pin shaft (13), and the side is provided with a threaded hole for installing the side plate (14).

7. The caliper-type structure extrusion tool according to claim 6, characterized in that: The side plates (14) are rectangular in structure and are fixed to both sides of the clamping plate with screws. The head of the pin shaft (13) is provided with a retaining ring groove for assembling an elastic retaining ring (20) for the shaft and a pin shaft through hole. The pin shaft (13) through hole is equipped with a split pin (21).

8. The caliper-type structure extrusion tool according to claim 7, characterized in that: The splint through-hole, the hydraulic cylinder (16) through-hole, the pin (13) through-hole and the splint through-hole are all provided with a graphite copper sleeve (19); the pin (13) passes through the splint through-hole and the graphite copper sleeve (19) in the upper arm (12), the lower arm (8) and the gear (18).

9. A caliper-type structure extrusion tool according to claim 1 or 8, characterized in that: The arc surface of the wear-resistant shaft (9) is provided with an adapted countersunk hole, and the wear-resistant shaft (9) is fixed to the semi-circular arc surface position of the upper arm (12) and the lower arm (8) by screws; the extrusion nozzle (11) adopts an upper and lower step-type layered structure, and has a U-shaped structure. An extrusion nozzle pressure plate (10) is provided between the wear-resistant shaft (9) and the extrusion nozzle (11), and the extrusion nozzle pressure plate (10) is in the shape of an isosceles triangle structure. The extrusion nozzle pressure plate (10) fixes the extrusion nozzle (11) to the wear-resistant shaft (9) by screws.

10. A caliper-type structure extrusion tool according to claim 1 or 8, characterized in that: The upper arm (12) is also provided with a lifting hole, which is located at the center of mass and is fixed with a lifting ring (15) via a thread.

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