A wire crimper and hydraulic system for controlling the oil circuit thereof

Abstract

The application discloses a wire crimping pliers and a hydraulic system for oil path control, which comprises a bottom plate, a swing plate rotatably arranged on the bottom plate, a vertical rod fixed on the swing plate, a rotating seat fixed on the top of the vertical rod, a swing rod rotatably arranged on the rotating seat, a second rotating seat fixed on the swing plate, a first rotating seat fixed on the bottom plate, a hydraulic cylinder arranged and connected between the first rotating seat and the second rotating seat, a gear fixed on the outer surface of a threaded shaft, a sector gear fixed on the top of the bottom plate and engaged with the gear, a lifting block arranged to slide up and down on the second rotating seat, a threaded shaft with threads arranged in the lifting block and threadedly connected with the threaded shaft, a T-shaped rod fixed on the top of the lifting block and movably connected with the swing rod, and the hydraulic cylinder drives the threaded shaft to rotate through the swing plate, the gear and the sector gear after working, so that the swing rod swings backward and the left lower part presses downward at the same time.

Description

Technical Field

[0001] This invention relates to the technical field of wire crimping pliers and their hydraulic systems, specifically a wire crimping pliers and its hydraulic system with oil circuit control. Background Technology

[0002] In the fields of pipeline engineering and pressure vessel manufacturing, the sealing installation of large-size flanges typically requires the use of crimping pliers to press the top outer area of ​​the flange downwards, ensuring a reliable sealing contact between the flange and the gasket. Existing crimping pliers often employ integrated hydraulic structures with complex hydraulic cavities machined inside the mold and coupled with dedicated piston rods. However, this approach has the following drawbacks: First, the hydraulic actuation structure of existing crimping pliers usually requires machining complex hydraulic cavities and corresponding piston rods within the mold body, resulting in high machining difficulty and manufacturing costs. Furthermore, since the hydraulic components are integrated with the mold, damage to the hydraulic components necessitates complete replacement or return to the factory for repair, leading to poor replaceability and maintenance convenience. Second, the swinging and pressing actions of existing crimping pliers and the lifting and lowering actions of the front pressure head are usually controlled by independent drive mechanisms, lacking mechanical linkage and making it difficult to achieve synchronous coordination of swinging and pressing. This results in complex hydraulic circuits and control systems. Third, existing hydraulic systems often use simple unidirectional oil supply circuits, leading to asymmetrical pressure during the extension and retraction of the hydraulic cylinder. This makes it difficult to maintain stable output pressure when clamping large-size flanges, affecting clamping reliability. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a wire crimping clamp and its hydraulic circuit control system, which adopts a standard hydraulic cylinder, low friction rotary connection, and can realize synchronous linkage of swing and pressing and has a pressure holding function, so as to reduce manufacturing costs, improve transmission efficiency and crimping reliability.

[0004] This invention is achieved through the following technical solution: A wire clamp of this invention includes a base plate, a swing plate rotatably mounted on the base plate, a vertical rod fixed on the swing plate, a rotating seat fixed at the top of the vertical rod, a swing arm rotatably mounted on the rotating seat, a second rotating seat fixed on the swing plate, a first rotating seat fixed on the base plate, a hydraulic cylinder connected between the first and second rotating seats, a gear fixed on the outer surface of the threaded shaft, a sector rack meshing with the gear fixed at the top of the base plate, a lifting block that slides up and down on the second rotating seat, an internal threaded hole threaded to the threaded shaft being opened in the lifting block, a T-shaped rod fixed at the top of the lifting block, and the T-shaped rod being movably connected to the swing arm. After the hydraulic cylinder operates, it drives the threaded shaft to rotate through the swing plate, gear, and sector rack, causing the lifting block and T-shaped rod to rise upwards, and causing the swing arm to swing backwards while pressing down on the lower left side.

[0005] A further technical solution is provided in which a bottom groove is formed inside the swing arm, and a sliding groove is provided on the front and rear sides of the bottom groove. The top of the T-shaped rod is cross-shaped, and the T-shaped rod passes through the bottom groove and is movably connected to the sliding groove. A ball seat is rotatably provided at the lower left side of the swing arm.

[0006] In a further technical solution, two sliding holes are provided in the lifting block, and two guide rods are fixed on the top of the second rotating seat. The guide rods extend into the sliding holes and slide to connect with them.

[0007] A further technical solution is that a stand is fixed to one side of the fan-shaped rack, a limit block is fixed to the bottom of the stand, the limit block is fixedly connected to the base plate, and limit plates are fixed to the front and rear sides of the inner wall of the base plate.

[0008] A further technical solution is provided, wherein a first housing is fixed to one side of the hydraulic cylinder body, and a second housing is fixed to one side of the hydraulic cylinder push rod. The first housing is rotatably disposed outside the first rotating seat, and the second housing is rotatably disposed outside the second rotating seat. A first low-friction rotating assembly is disposed between the first housing and the first rotating seat, and a second low-friction rotating assembly is disposed between the second housing and the second rotating seat.

[0009] A further technical solution includes a first low-friction rotating assembly comprising a first ball fixed to the bottom of the first rotating seat, the first ball being fixedly connected to the base plate, a second bearing being rotatably disposed on the outer ring of the first rotating seat, a second ring block being disposed on the outer ring of the second bearing, and a plurality of second balls being rotatably disposed on the bottom of the second ring block, the second balls rolling and abutting against the upper end face of the first ball, and the first housing being snapped onto the outer surface of the second ring block and detachably connected to the second ring block.

[0010] A further technical solution includes a second low-friction rotating assembly comprising a first plate fixed to the swing plate, a third bearing rotatably disposed on the outer surface of the second rotating seat, a first ring block disposed on the outer ring of the third bearing, the first ring block being detachably connected to the second housing, and a plurality of second plates disposed at the bottom of the first ring block, the second plates abutting against the upper surface of the first plate.

[0011] A hydraulic control system for a crimping pliers includes an oil tank. A plunger pump is connected to one side of the oil tank. A first check valve is connected to the outlet of the plunger pump. A filter and a safety valve are connected to the outlet of the first check valve. The outlet of the safety valve is connected to the oil tank. A pressure gauge, a pressure regulating valve, and a two-position four-way solenoid valve are connected to the outlet of the filter. The outlet of the pressure regulating valve is connected to the oil tank. One outlet of the two-position four-way solenoid valve is connected to the oil tank. A second check valve is connected to the other outlet of the two-position four-way solenoid valve. A pressure switch is connected to the outlet of the second check valve. A ball valve is connected to the outlet of the pressure switch. A seventh check valve is connected to the outlet of the ball valve. The seventh check valve is connected to the oil tank.

[0012] In a further technical solution, the hydraulic cylinder is divided into two chambers by a piston. A third check valve and a fourth check valve are respectively connected to the two sides of the first chamber, and a fifth check valve and a sixth check valve are respectively connected to the two sides of the second chamber. The outlet of the pressure switch is connected to the inlet of the third check valve and the fifth check valve, and the outlet of the fourth check valve and the sixth check valve is connected to the oil tank.

[0013] In a further technical solution, the third, fifth, fourth, and sixth check valves are electromagnetic check valves.

[0014] The beneficial effects of this invention are as follows: First, by rotatably connecting the two ends of the hydraulic cylinder to the first rotating seat on the base plate and the second rotating seat on the swing plate respectively, the hydraulic cylinder pushes the swing plate away from the first rotating seat to swing, causing the gear fixed on the swing plate to mesh and rotate with the sector rack on the base plate, thereby driving the threaded shaft to rotate. The threaded shaft is threadedly connected to the internal threaded hole in the lifting block, causing the lifting block and T-shaped rod to be lifted upward. The T-shaped rod is movably connected to the bottom groove and sliding groove in the swing rod, causing the ball seat at the front end of the swing rod to press down on the flange, thus realizing the synchronous linkage of swinging and pressing. At the same time, by using a standard hydraulic cylinder with a low-friction rotating component and configuring a hydraulic system with pressure holding and equal pressure bidirectional drive functions, the problems of complex processing, high friction loss, asynchronous operation and unstable pressure of existing wire clamps are effectively solved, reducing manufacturing costs and maintenance difficulty, and improving transmission efficiency and clamping reliability.

[0015] Second, through the meshing transmission of gears and sector racks, the horizontal swing of the swing plate is converted into the rotational motion of the threaded shaft. Then, through the helical transmission of the threaded shaft and the lifting block, the rotational motion is converted into the linear lifting of the lifting block. Finally, the T-shaped rod drives the swing arm to achieve the downward pressing action of the front end. The single linear thrust of the hydraulic cylinder is transmitted through the three motion forms of swinging, rotation and lifting in sequence. This realizes the synchronous and coordinated action of the swing arm pressing the flange downward while swinging forward, avoiding the uneven force caused by independent drive. It also allows multiple crimping clamps arranged in a circle to apply uniform clamping force to the flange at the same time, improving the reliability of the sealing installation.

[0016] Third, using standard hydraulic cylinders as the power source eliminates the need to machine complex hydraulic cavities and special piston rods in the mold body, significantly reducing processing difficulty and manufacturing costs; the hydraulic cylinder body and the push rod end are respectively fixed with a first housing and a second housing, and are rotatably connected to the first rotating seat and the second rotating seat through a low-friction rotating assembly. When the hydraulic cylinder is damaged, the first housing, the hydraulic cylinder and the second housing can be directly replaced as a whole, which is highly replaceable and convenient to maintain, overcoming the defects of difficult maintenance of existing integrated hydraulic structures.

[0017] Fourth, the first low-friction rotating assembly and the second low-friction rotating assembly respectively adopt the structure of ball bearing and bearing. The ball bearing provides rolling support to the ring block, so that the bearing is indirectly supported by the ring block during rotation. This avoids misalignment of the internal structure of the bearing due to axial load, significantly reduces the friction loss between the first housing and the first rotating seat and between the second housing and the second rotating seat, and enables the hydraulic thrust to be accurately transmitted to the swing plate, improving the transmission efficiency and positioning accuracy, while extending the service life of the rotating connection parts.

[0018] V. The hydraulic system, through the cooperation of a piston pump, a two-position four-way solenoid valve, and multiple check valves, can achieve the same pressure drive when the hydraulic cylinder extends and retracts the piston rod. The check valves keep the hydraulic oil under pressure within the hydraulic cylinder, ensuring that the crimping pliers maintain a stable output pressure after tightening the flange. At the same time, the system is equipped with a safety valve to prevent overpressure, a filter to filter impurities, a pressure gauge to monitor pressure, and a ball valve to release pressure, ensuring the safety and reliability of the hydraulic system operation.

[0019] 6. Limiting plates are fixed on the front and rear sides of the inner wall of the base plate. The included angle between the limiting plates limits the rotation range of the swing plate and prevents the swing plate from overtraveling. Two sliding holes are opened in the lifting block, which slide with the two guide rods on the top of the second rotating seat, providing precise up and down movement guidance for the lifting block. This ensures that the lifting block can only move up and down in a straight line along the guide rod when the threaded shaft rotates, thus ensuring the movement accuracy and stability of the T-shaped rod lifting swing arm.

[0020] 7. The top of the base plate is detachably connected to a housing. The housing has a first hole for the hydraulic pipe to pass through, a second hole for the T-shaped rod to move, and a third hole for the vertical rod to rotate through. The internal transmission mechanism is protected by the housing, preventing the intrusion of external dust and impurities. At the same time, each hole corresponds precisely to the moving parts, avoiding motion interference and improving the protection level and operational safety of the equipment.

[0021] 8. The outer surface of the threaded shaft is provided with multiple steps, which are rotated and connected with multiple bearings in the mounting hole, improving the load-bearing capacity and rotational stability of the threaded shaft; the outer surface of the shaft is provided with a boss that abuts against the upper end face of the inner ring of the first bearing, and the inner ring of the first bearing is abutted and fixed by the sleeve on the top of the cover plate, so that the vertical rod and the swing plate have stable rotational support, ensuring the smoothness and durability of the meshing transmission of the gear and the sector rack. Attached Figure Description

[0022] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the overall structure of the wire crimping pliers; Figure 2 This is a schematic diagram of the structure after the wire crimping pliers have been operated; Figure 3 for Figure 2 A bottom view of the structure of medium-voltage wire cutters; Figure 4 This is a schematic diagram of the structure of the limiting block 36; Figure 5 This is a structural schematic diagram of T-shaped rod 41; Figure 6 This is a schematic diagram of the swing arm 34 from a low angle. Figure 7 A schematic diagram of the wire crimping pliers after removing the housing 32; Figure 8 for Figure 7 A schematic diagram at point A in the middle; Figure 9 for Figure 7 A schematic diagram of the first vertical section of the medium-voltage wire cutter; Figure 10 for Figure 9 A schematic diagram at point B in the middle; Figure 11 This is a schematic diagram of the internal structure of the wire crimping pliers after operation. Figure 12 for Figure 11 A schematic diagram at point C in the middle; Figure 13 for Figure 11 A schematic diagram of the second vertical sectioning structure of the medium-pressure wire cutter; Figure 14 for Figure 13 A schematic diagram at point D in the middle; Figure 15 Diagram of the hydraulic control system for wire crimping pliers; In the diagram, the components are: oil tank 11, plunger pump 12, first check valve 13, safety valve 14, filter 15, pressure gauge 16, two-position four-way solenoid valve 17, pressure switch 18, hydraulic cylinder 19, seventh check valve 22, pressure regulating valve 23, second check valve 24, third check valve 25, fifth check valve 26, fourth check valve 27, sixth check valve 28, ball valve 29, base plate 31, housing 32, rotating seat 33, rocker arm 34, mounting plate 35, limit block 36, limit plate 37, and fan. 38. Toothed rack, 39. Stand, 41. T-shaped rod, 42. Lifting block, 43. Sliding hole, 45. Bottom groove, 46. Sliding groove, 47. Ball seat, 51. First housing, 52. First rotating seat, 53. Swing plate, 55. Vertical rod, 56. Second housing, 57. Gear, 61. Rotating shaft, 62. Mounting seat, 63. Cover plate, 64. First plate, 65. Guide rod, 67. Threaded shaft, 68. Second rotating seat, 69. Mounting hole, 71. First rolling ball, 72. Second rolling ball, 73. Second ring block, 74. Second plate, 75. Detailed Implementation

[0024] like Figures 1-15 As shown, the present invention will be described in detail. For ease of description, the directions mentioned below are defined as follows: the directions of up, down, left, right, front, and back mentioned below are the same as... Figure 1 The directions of the projection relationship are consistent in all directions: up, down, left, right, front, and back.

[0025] In embodiment one, a wire crimping pliers of the present invention includes a base plate 31, a swing plate 53 rotatably mounted on the base plate 31, a vertical rod 55 fixed on the swing plate 53, a rotating seat 33 fixed to the top of the vertical rod 55, a swing arm 34 rotatably mounted on the rotating seat 33, a second rotating seat 69 fixed on the swing plate 53, a first rotating seat 52 fixed on the base plate 31, a hydraulic cylinder 19 connecting the first rotating seat 52 and the second rotating seat 69, a gear 57 fixed to the outer surface of a threaded shaft 68, a sector-shaped rack 38 meshing with the gear 57 fixed to the top of the base plate 31, and the second rotating seat 69... The 9 is provided with a lifting block 42 that slides up and down. The lifting block 42 has an internal threaded hole 44 that is threaded to the threaded shaft 68. A T-shaped rod 41 is fixed on the top of the lifting block 42. The T-shaped rod 41 is movably connected to the swing rod 34. After the hydraulic cylinder 19 works, it drives the swing plate 53 away from the first rotating seat 52 to swing. The gear 57 meshes with the sector rack 38 and rotates, driving the threaded shaft 68 to rotate. Since the threaded shaft 68 is threaded to the internal threaded hole 44, it drives the lifting block 42 and the T-shaped rod 41 to lift upward, swinging the swing rod 34 backward while pressing the lower left side downward.

[0026] Advantageously, the swing arm 34 has a bottom groove 45, and the front and rear sides of the bottom groove 45 are connected by a sliding groove 46. The top of the T-shaped rod 41 is cross-shaped. After passing through the bottom groove 45, the T-shaped rod 41 is movably connected to the sliding groove 46. A ball seat 47 is rotatably provided at the lower left side of the swing arm 34.

[0027] The swing arm 34 and the rotating seat 33 form a lever structure. After the lifting block 42 and the T-shaped rod 41 push upward, since the T-shaped rod 41 is movably connected to the bottom groove 45 and the sliding groove 46, it also drives the right side of the swing arm 34 to push upward, causing the left side of the swing arm 34 to push downward, pressing the ball seat 47 onto the flange, thus achieving the function of simultaneous rotation and downward pressing. The flange refers to a large flange, which requires multiple crimping pliers around it. The crimping pliers operate simultaneously, pressing the top outer area of ​​the flange downward, thus tightening the flange downward.

[0028] Advantageously, the lifting block 42 has two sliding holes 43, and the top of the second rotating seat 69 has two guide rods 67, which extend into the sliding holes 43 and slide to connect with them.

[0029] The guide rod 67 is slidably connected to the sliding hole 43, so that the lifting block 42 can only move up and down after being guided. It provides the installation reference for the lifting block 42. After the internal threaded hole 44 is threadedly connected to the threaded shaft 68, the lifting block 42 can be moved up and down by rotating the threaded shaft 68.

[0030] Advantageously, a stand 39 is fixed to one side of the fan-shaped rack 38, a limit block 36 is fixed to the bottom of the stand 39, the limit block 36 is fixedly connected to the base plate 31, and a limit plate 37 is fixed to the front and rear sides of the inner wall of the base plate 31.

[0031] The limiting plate 37 provides a limiting structure for the rotation of the swing plate 53. The limiting plate 37 abuts against the side of the swing plate 53 to limit the rotation angle of the swing plate 53. The included angle between the limiting plates 37 is 45°, so the rotation range of the swing plate 53 is 45°.

[0032] Advantageously, the second rotating seat 69 has a mounting hole 71, and multiple bearings are installed in the mounting hole 71. The outer surface of the threaded shaft 68 has multiple steps, and the steps are rotatably connected with the bearings.

[0033] The threaded shaft 68 is rotatably connected to multiple bearings within the mounting hole 71 via a step on its outer surface, thereby improving its load-bearing capacity. Since the threaded shaft 68 needs to transmit torque, its stability requirements are high. This design enhances the rotational stability of the threaded shaft 68.

[0034] In Example 2, based on Example 1, the following further details are provided: a rotating seat assembly is provided between the swing plate 53 and the base plate 31. The rotating seat assembly includes a mounting base 62 fixed to the bottom of the base plate 31. A first bearing is installed and fixed inside the mounting base 62. A rotating shaft 61 concentrically arranged with the vertical rod 55 is fixed to the bottom of the swing plate 53. The rotating shaft 61 is rotatably connected to the first bearing.

[0035] Advantageously, the outer surface of the rotating shaft 61 is provided with a boss, which abuts against the upper end face of the inner ring of the first bearing. The rotating shaft 61 is inserted into the inner ring of the first bearing, and the outer ring of the first bearing is snapped and fixed in the mounting seat 62. The sleeve on the top of the cover plate 63 abuts and fixes the inner ring of the first bearing against one side of the boss.

[0036] By incorporating a rotating base assembly, the vertical rod 55 and the swing plate 53 are equipped with a stable rotation function.

[0037] In Example 3, based on any one of Examples 1 to 2, the following further details are provided: a first housing 51 is fixed to one side of the hydraulic cylinder 19 body, and a second housing 56 is fixed to one side of the push rod of the hydraulic cylinder 19. The first housing 51 is rotatably disposed outside the first rotating seat 52, and the second housing 56 is rotatably disposed outside the second rotating seat 69. A first low-friction rotating assembly is provided between the first housing 51 and the first rotating seat 52, and a second low-friction rotating assembly is provided between the second housing 56 and the second rotating seat 69.

[0038] By separately configuring a first low-friction rotating component and a second low-friction rotating component, the hydraulic cylinder 19 significantly reduces frictional losses between the first housing 51 and the first rotating seat 52, as well as between the second housing 56 and the second rotating seat 69, after operation. Compared to existing technologies, using a standard hydraulic cylinder 19 to transmit hydraulic pressure results in lower costs and avoids the need to machine complex hydraulic cavities in molds and separately machine corresponding piston rods, offering greater replaceability. If the hydraulic cylinder 19 is damaged, the first housing 51, the hydraulic cylinder 19, and the second housing 56 can be replaced as a whole, facilitating maintenance. Furthermore, compared to existing technologies, the push structure employs a low-friction design, reducing frictional losses and enabling accurate transmission of thrust.

[0039] Advantageously, the first low-friction rotating assembly includes a first ball 72 fixed to the bottom of the first rotating seat 52. The first ball 72 is fixedly connected to the base plate 31. A second bearing is rotatably provided on the outer ring of the first rotating seat 52. A second ring block 74 is provided on the outer ring of the second bearing. A plurality of second balls 73 are rotatably provided on the bottom of the second ring block 74. The second balls 73 roll and abut against the upper end face of the first ball 72. The first housing 51 is fastened to the outer surface of the second ring block 74 and is detachably connected to the second ring block 74.

[0040] Multiple threaded holes are provided on the upper surface of the second ring block 74, and through holes are provided in the first housing 51. Bolts are then threaded through the first housing 51 and fixed to the second ring block 74. The inclusion of the second ball bearing 73 supports the second ring block 74, indirectly lifting the second bearing during rotation and preventing misalignment or uneven operation of the bearing's internal structure. Furthermore, the first housing 51 and the second ring block 74 are detachably connected, facilitating the replacement of the first housing 51.

[0041] Advantageously, the second low-friction rotating assembly includes a first plate 64 fixed on the swing plate 53, a third bearing rotatably disposed on the outer surface of the second rotating seat 69, a first ring block 65 disposed on the outer ring of the third bearing, the first ring block 65 being detachably connected to the second housing 56, and a plurality of second plates 75 disposed at the bottom of the first ring block 65, the second plates 75 abutting against the upper end face of the first plate 64.

[0042] The second low-friction rotating assembly functions the same as the first low-friction rotating assembly. The second housing 56 and the first ring block 65 are detachably fixed together by bolts, facilitating the overall disassembly and replacement of the hydraulic cylinder.

[0043] Example 4, based on any one of Examples 1 to 3, further defines the following: the top of the base plate 31 is detachably connected to the housing 32, the front side of the housing 32 is provided with a first hole for the hydraulic pipe of the hydraulic cylinder 19 to pass through, the top of the housing 32 is also provided with a second hole for the T-shaped rod 41 to move, and the top of the housing 32 is also provided with a third hole for the vertical rod 55 to rotate through.

[0044] Multiple holes are provided on the housing 32 to avoid motion interference.

[0045] Example 5, based on any one of Examples 1 to 4, further specifies the following: The hydraulic cylinder 19 is controlled by a hydraulic system, which includes an oil tank 11. A plunger pump 12 is connected to one side of the oil tank 11. A first check valve 13 is connected to the outlet of the plunger pump 12. A filter 15 and a safety valve 14 are connected to the outlet of the first check valve 13. The outlet of the safety valve 14 is connected to the oil tank 11. A pressure gauge 16, a pressure regulating valve 23, and a two-position four-way solenoid valve 17 are connected to the outlet of the filter 15. The outlet of the pressure regulating valve 23 is connected to the oil tank 11. One outlet of the two-position four-way solenoid valve 17 is connected to the oil tank 11. Another outlet is connected to a second check valve 24, and the outlet of the second check valve 24 is connected to a pressure switch 18. The hydraulic cylinder 19 is divided into two chambers by a piston. The first chamber is connected to a third check valve 25 and a fourth check valve 27 on both sides, and the second chamber is connected to a fifth check valve 26 and a sixth check valve 28 on both sides. The outlet of the pressure switch 18 is connected to the inlet of the third check valve 25 and the fifth check valve 26. The outlets of the fourth check valve 27 and the sixth check valve 28 are connected to the oil tank 11. The outlet of the pressure switch 18 is connected to a ball valve 29, and the outlet of the ball valve 29 is connected to a seventh check valve 22. The seventh check valve 22 is connected to the oil tank 11.

[0046] The first check valve 13, the second check valve 24, and the seventh check valve 22 define the flow direction of the hydraulic oil. The first check valve 13 defines the flow of hydraulic oil from the plunger pump 12 to the safety valve 14 and the filter 15. The second check valve 24 defines the flow of hydraulic oil from the two-position four-way solenoid valve 17 to the hydraulic cylinder 19. The seventh check valve 22 defines the flow of hydraulic oil from the ball valve 29 to the oil tank 11.

[0047] The third check valve 25, fifth check valve 26, fourth check valve 27, and sixth check valve 28 are electromagnetic check valves, normally closed. When the hydraulic cylinder 19 is working, the third check valve 25 and the sixth check valve 28 open first, injecting high-pressure hydraulic oil into the first chamber through the third check valve 25. The piston rod inside the hydraulic cylinder 19 is pushed out of the hydraulic cylinder 19, and the hydraulic oil in the second chamber flows back to the oil tank 11 through the sixth check valve 28. When the hydraulic cylinder 19 is fully extended, the hydraulic system maintains pressure. When the piston rod returns to its original position, the fifth check valve 26 and the fourth check valve 27 open, injecting high-pressure hydraulic oil into the second chamber through the fifth check valve 26. The piston rod retracts into the hydraulic cylinder 19, and the hydraulic oil in the first chamber flows back to the oil tank 11 through the fourth check valve 27. The advantage of this design is that, since the hydraulic cylinder 19 needs to provide a sufficiently large thrust to overcome the meshing friction of the gear 57 and the sector rack 38, the thread friction of the threaded shaft 68 and the internal threaded hole 44, and the reaction force after the swing rod 34 is pressed down, this design ensures that the hydraulic cylinder 19 achieves the same pressure when extending and retracting the piston rod, so that the crimping pliers can work normally and reset.

[0048] The working principle of this hydraulic system is as follows: First, the plunger pump 12 pressurizes the oil tank 11. When the pressure reading displayed on the pressure gauge 16 reaches the preset 40 MPa of the pressure regulating valve 23, the plunger pump 12 is shut off. Then, the two-position four-way solenoid valve 17 and the pressure switch 18 work, injecting high-pressure hydraulic oil into the third check valve 25 through the second check valve 24 and the pressure switch 18. The return oil from the hydraulic cylinder 19 flows back to the oil tank 11 through the sixth check valve 28. At this time, due to the multiple check valves, the hydraulic oil from the oil tank 11 to the hydraulic cylinder 19 is in a pressure-holding state. This allows the hydraulic cylinder 19 to remain in the extended state. When the hydraulic cylinder 19 resets, the fifth check valve 26 and the fourth check valve 27 open, and the hydraulic cylinder 19 remains in the retracted state. If the system is not used for a long period, pressure relief is required by opening the ball valve 29 to allow the hydraulic oil to flow back to the oil tank 11, so that the pressure system gradually returns to its initial state.

[0049] The safety valve 14 is used to display whether the working pressure of the hydraulic cylinder 19 is normal. It is designed to prevent overpressure in the hydraulic system. The filter 15 is used to filter the hydraulic oil and prevent impurities.

[0050] Based on the hydraulic system of Example 5, the complete working process of this equipment is as follows: Based on the initial and final positions of the lever 34, the hydraulic clamp is properly installed around the flange. The initial position should be far from the upper side of the flange, and the final position should press against the hole on the flange. Multiple mounting plates 35 are fixed at the bottom of the base plate 31. The mounting plates 35 are used to install and fix the clamping clamp.

[0051] When the crimping pliers are working, the hydraulic cylinder 19 pushes out its piston rod, which in turn drives the swing plate 53 to swing counterclockwise. The swing plate 53 then drives the vertical rod 55, the rotating seat 33, and the swing rod 34 to rotate counterclockwise. Since the gear 57 is meshed with the sector rack 38, the gear 57 rolls clockwise backward on the sector rack 38. The gear 57 drives the threaded shaft 68 to rotate clockwise. Since the threaded shaft 68 is threadedly connected to the internal threaded hole 44, it also drives the lifting block 42 and the T-shaped rod 41 to rise upward. Since the T-shaped rod 41 passes through the bottom groove 45 and is movably connected to the sliding groove 46, it also drives the swing rod 34 to swing around the rotating seat 33. At the same time, the ball seat 47 at the bottom of the swing rod 34 presses the flange downward, and the hydraulic cylinder 19 is in a pressure-holding state.

[0052] When the hydraulic cylinder 19 is reset, the above working process is reversed to realize the resetting function of the crimping pliers. The hydraulic cylinder 19 can also be in a pressure-holding state so that after the new flange is replaced, the hydraulic cylinder 19 and the hydraulic system can work again in a timely manner.

[0053] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions conceived without creative effort should be included within the scope of protection of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A wire crimping clamp, comprising a base plate (31), wherein a swing plate (53) is rotatably disposed on the base plate (31), a vertical rod (55) is fixed on the swing plate (53), a rotating seat (33) is fixed to the top of the vertical rod (55), and a swing arm (34) is rotatably disposed on the rotating seat (33), characterized in that, A second rotating seat (69) is fixed on the swing plate (53), and a first rotating seat (52) is fixed on the base plate (31). A hydraulic cylinder (19) is connected between the first rotating seat (52) and the second rotating seat (69). A gear (57) is fixed on the outer surface of the threaded shaft (68). A sector rack (38) that meshes with the gear (57) is fixed on the top of the base plate (31). A lifting block (42) that slides up and down is provided on the second rotating seat (69). (42) has an internal threaded hole (44) that is threaded to the threaded shaft (68). The top of the lifting block (42) is fixed with a T-shaped rod (41). The T-shaped rod (41) is movably connected to the swing rod (34). After the hydraulic cylinder (19) works, it drives the threaded shaft (68) to rotate through the swing plate (53), gear (57), and fan-shaped rack (38), so that the lifting block (42) and the T-shaped rod (41) are lifted upward, and the swing rod (34) swings backward while the lower left side is pressed downward.

2. The wire crimping pliers according to claim 1, characterized in that: The swing rod (34) has a bottom groove (45) inside, and a sliding groove (46) is provided on the front and rear sides of the bottom groove (45). The top of the T-shaped rod (41) is cross-shaped. The T-shaped rod (41) passes through the bottom groove (45) and is movably connected to the sliding groove (46). A ball seat (47) is rotatably provided on the lower left side of the swing rod (34).

3. A wire crimping tool according to claim 1, characterized in that: The lifting block (42) has two sliding holes (43) and the top of the second rotating seat (69) has two guide rods (67) fixed. The guide rods (67) extend into the sliding holes (43) and slide to connect with them.

4. A wire crimping tool according to claim 1, characterized in that: A stand (39) is fixed to one side of the fan-shaped rack (38), and a limit block (36) is fixed to the bottom of the stand (39). The limit block (36) is fixedly connected to the base plate (31), and a limit plate (37) is fixed to the front and rear sides of the inner wall of the base plate (31).

5. A wire crimping tool according to claim 1, characterized in that: A first housing (51) is fixed to one side of the hydraulic cylinder (19) body, and a second housing (56) is fixed to one side of the push rod of the hydraulic cylinder (19). The first housing (51) is rotatably disposed outside the first rotating seat (52), and the second housing (56) is rotatably disposed outside the second rotating seat (69). A first low-friction rotating assembly is disposed between the first housing (51) and the first rotating seat (52), and a second low-friction rotating assembly is disposed between the second housing (56) and the second rotating seat (69).

6. A wire crimping tool according to claim 5, characterized in that: The first low-friction rotating assembly includes a first ball (72) fixed to the bottom of the first rotating seat (52). The first ball (72) is fixedly connected to the base plate (31). The outer ring of the first rotating seat (52) is provided with a second bearing. The outer ring of the second bearing is provided with a second ring block (74). The bottom of the second ring block (74) is provided with a plurality of second balls (73). The second balls (73) roll against the upper surface of the first ball (72). The first housing (51) is fastened to the outer surface of the second ring block (74) and is detachably connected to the second ring block (74).

7. A wire crimping tool according to claim 5, characterized in that: The second low-friction rotating assembly includes a first plate (64) fixed on the swing plate (53), a third bearing rotatably mounted on the outer surface of the second rotating seat (69), a first ring block (65) mounted on the outer ring of the third bearing, the first ring block (65) being detachably connected to the second housing (56), and a plurality of second plates (75) mounted on the bottom of the first ring block (65), the second plates (75) abutting against the upper surface of the first plate (64).

8. The hydraulic control system for a wire crimping tool according to any one of claims 1-7, characterized in that: Includes an oil tank (11), on one side of which a plunger pump (12) is connected. The outlet of the plunger pump (12) is connected to a first check valve (13). The outlet of the first check valve (13) is connected to a filter (15) and a safety valve (14). The outlet of the safety valve (14) is connected to the oil tank (11). The outlet of the filter (15) is connected to a pressure gauge (16), a pressure regulating valve (23), and a two-position four-way solenoid valve (17). The outlet of the pressure regulating valve (23) is connected to... The two-position four-way solenoid valve (17) is connected to the oil tank (11). One of its outlets is connected to the oil tank (11). The other outlet of the two-position four-way solenoid valve (17) is connected to a second check valve (24). The outlet of the second check valve (24) is connected to a pressure switch (18). The outlet of the pressure switch (18) is connected to a ball valve (29). The outlet of the ball valve (29) is connected to a seventh check valve (22). The seventh check valve (22) is connected to the oil tank (11).

9. A wire crimping tool and its hydraulic control system according to claim 8, characterized in that: The hydraulic cylinder (19) is divided into two chambers by a piston. The first chamber is connected to the third check valve (25) and the fourth check valve (27) on both sides respectively. The second chamber is connected to the fifth check valve (26) and the sixth check valve (28) on both sides respectively. The outlet of the pressure switch (18) is connected to the inlet of the third check valve (25) and the fifth check valve (26). The outlet of the fourth check valve (27) and the sixth check valve (28) is connected to the oil tank (11).

10. A wire crimping tool and its hydraulic control system according to claim 9, characterized in that: The third check valve (25), the fifth check valve (26), the fourth check valve (27) and the sixth check valve (28) are electromagnetic check valves.

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