Portable steel rail lead wire head pressing tool for railway

Abstract

The invention provides a portable steel rail lead wire head pressing tool for a railway, and relates to the technical field of wiring tools, and the portable steel rail lead wire head pressing tool is characterized in that a crimping hinge clamp is hinged to the upper end of a crimping machine body; the limiting hinge rod is hinged to the upper end of the crimping machine body; the fixed rod is fixedly connected to the outer side of the crimping machine body; the wire feeding sliding plate is connected to the outer side of the fixing rod in a sliding mode. The pressure head seat is connected to the upper end of the crimping machine body in a sliding manner; the multiple fixed guide rods are fixedly connected to the upper end face of the wire feeding sliding plate. The wire feeding adjusting plate is slidably connected to the outer sides of the multiple fixed guide rods, and the problem that in the process that a portable pressing head tool is used for conducting pressing connection on a lead wire, in the pressing connection process of different parts in sequence, after a worker completes one-time pressing connection, the lead wire needs to be adjusted to a proper position, then pressing connection operation is conducted again, and the pressing connection efficiency is high is solved. The problem that the overall efficiency of the crimping work is easily affected is solved, and the working efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of wiring tools, in particular to a portable railway rail lead wire pressing head tool. Background Art

[0002] The purpose of railway rail lead wires is to build a bridge connecting the rails with various outdoor signal equipment. Whenever actual wiring operations are performed, portable crimping tools are usually used to crimp the lead wires. In this way, the lead wires can be tightly and firmly connected to related components, thereby laying a solid foundation for the smooth transmission of signals and effectively ensuring that the railway signal system always maintains a normal and orderly operation state.

[0003] According to the application number: CN201010017652.8, an electric crimping tool is disclosed, comprising: a housing, a switch is arranged on the housing, a power supply and a circuit control device are arranged inside the lower end of the housing, a motor and a reducer are arranged inside the upper end of the housing, a driving gear is arranged on the output shaft of the reducer, the driving gear cooperates with a driven gear fixed on a screw sleeve, the screw sleeve is sleeved on a screw rod in the housing and spirally cooperates with the screw rod, a bumper is arranged on the screw rod, a front travel switch and a rear travel switch that cooperate with the bumper are arranged in the housing, and the front end of the screw rod cooperates with a clamp assembly arranged at the front end of the housing. Its advantages are: avoiding the structural defects of hydraulic crimping, having the advantages of convenient crimping, small size, light weight, easy to carry, high degree of automation, etc.

[0004] However, in current railway construction and maintenance operations, when using portable crimping tools to crimp lead wires, it is usually necessary to repeat the crimping operation at multiple different locations. Only in this way can the stability of the connection between the lead wire and related components be fully guaranteed. In the process of crimping different locations in turn, after completing one crimping, the staff needs to manually move the lead wire, adjust the lead wire to a suitable position, and then perform the crimping operation again. However, this method that relies on manual operation is likely to have an adverse effect on the overall efficiency of the crimping work, making it difficult to effectively improve work efficiency. Summary of the invention

[0005] In view of this, the present invention provides a portable railway rail lead wire pressing head tool, which has the advantages of improving work efficiency and reducing labor intensity.

[0006] The present invention provides a portable railway rail lead wire crimping tool, which specifically includes a crimping body, a crimping hinge clamp, a limiting hinge rod, a fixing rod, a wire feeding sliding plate, a crimping head seat, a fixed guide rod, a wire feeding adjustment plate, a hinge block, a wire feeding extrusion piece, a replacement mechanism and a crimping mechanism; the crimping hinge clamp is hinged at the upper end of the crimping body; the limiting hinge rod is hinged at the upper end of the crimping body; the fixing rod is fixedly connected to the outside of the crimping body; the wire feeding sliding plate is slidably connected to the outside of the fixing rod; the crimping head seat is slidably connected to the upper end of the crimping body; a plurality of fixed guide rods are provided, and a plurality of fixed guide rods are fixedly connected to the upper end surface of the wire feeding sliding plate; the wire feeding adjustment plate is slidably connected to the outside of a plurality of fixed guide rods; the hinge block is hinged at the upper end of the wire feeding adjustment plate; the wire feeding extrusion piece is threadedly connected to the inner side of the upper end of the hinge block; the replacement mechanism is arranged at the upper end of the crimping body; the crimping mechanism is arranged at the outside of the crimping body:.

[0007] Furthermore, the replacement mechanism includes: positioning balls, positioning springs, replacement blocks and positioning grooves; the positioning balls are provided in two groups, and the two groups of positioning balls are slidably connected to the inner side of the crimped hinged clamp; the positioning springs are provided in two groups, and one end of the two groups of positioning springs are respectively fixedly connected to the outer sides of the two groups of positioning balls, and the other ends of the two groups of positioning springs are respectively fixedly connected to the inner side of the crimped hinged clamp; the replacement blocks are provided in two groups, and the two replacement blocks are slidably connected to the inner side of the crimped hinged clamp; the positioning grooves are provided in two groups, and the two groups of positioning grooves are respectively opened on the outer sides of the two replacement blocks.

[0008] Furthermore, the replacement mechanism also includes: a replacement wiring pressure head and a disassembly groove; the replacement wiring pressure head is threadedly connected to the inner side of the pressure head seat; there are two disassembly grooves, and both disassembly grooves are opened on the outer side of the replacement wiring pressure head.

[0009] Furthermore, the crimping mechanism includes: a connecting rack, a connecting gear ring and a fixed ratchet; the connecting rack is fixedly connected to the lower end surface of the pressure head seat; the connecting gear ring is rotatably connected to the inner side of the upper end of the crimping body, and the connecting gear ring is meshed with the connecting rack; the fixed ratchet is fixedly connected to the inner side of the connecting gear ring.

[0010] Furthermore, the crimping mechanism also includes: a connecting shaft, a connecting pawl and a connecting threaded rod; the connecting shaft is rotatably connected to the inner side of the upper end of the crimping body; the connecting pawl is hinged to the outer side of the connecting shaft, and a torsion spring is provided at the hinge between the connecting pawl and the connecting shaft; the connecting threaded rod is fixedly connected to the inner side of the connecting shaft.

[0011] Furthermore, the crimping mechanism also includes: an adjusting member and an adjusting screw; the adjusting member is rotatably connected to the inner side of the wire feeding sliding plate; and the adjusting screw is fixedly connected to the upper end surface of the adjusting member.

[0012] Furthermore, the crimping mechanism also includes: a fixed plate, a sliding limit block and a limit compression spring; the fixed plate is fixedly connected to the outer side of the hinge block; there are two sliding limit blocks, and both sliding limit blocks are slidably connected to the inner side of the wire feeding adjustment plate; there are two groups of limit compression springs, one end of the two groups of limit compression springs are respectively fixedly connected to the outer sides of the two sliding limit blocks, and the other ends of the two groups of limit compression springs are fixedly connected to the inner side of the wire feeding adjustment plate.

[0013] Furthermore, the crimping mechanism also includes: a trapezoidal slot, a pressing operation block and a trapezoidal plug-in block; there are two trapezoidal slots, which are respectively opened on the inner sides of the two sliding limit blocks; there are two pressing operation blocks, which are both slidably connected to the inner side of the wire feeding adjustment plate; there are two trapezoidal plug-in blocks, which are respectively fixedly connected to the outer sides of the two pressing operation blocks.

[0014] Beneficial Effects The present invention realizes the replacement of the replacement block and the replacement wiring pressure head through the setting of the replacement mechanism. The replacement wiring pressure head can be disassembled and replaced by using corresponding tools. The replacement block is slidably connected to the inner side of the crimping hinge clamp. At this time, the positioning ball will be pressed in the positioning groove under the action of the positioning spring, so as to complete the installation of the replacement block. If the replacement block is pushed hard, the replacement block can be removed. The whole operation process is very simple, which not only effectively improves the work efficiency, but also reduces the use cost, and at the same time helps to extend the service life of related components.

[0015] In addition, through the setting of the crimping mechanism, continuous crimping of the lead wire is achieved. The pressing operation block is pushed to drive the trapezoidal plug block to be inserted into the inner side of the trapezoidal slot. At this time, the sliding limit block will slide toward the inner side of the wire feeding adjustment plate under the action of the trapezoidal plug block and the trapezoidal slot, and then the hinge block will be opened. The lead wire is placed into the upper end of the wire feeding adjustment plate and then the hinge block is closed. When the hinge block is closed, the sliding limit block will limit the fixed plate under the action of the limit compression spring. Then the wire feeding extrusion piece is rotated to squeeze the lead wire through the threaded connection with the hinge block. Then the crimping hinge clamp is opened, the lead wire and the parts to be connected are placed into the inner side of the crimping hinge clamp, and then the crimping hinge clamp is closed to start. The crimping machine body drives the pressure head seat to slide upward through the connecting rack, so that the replacement wiring pressure head slides upward to crimp the lead wires and parts. When the crimping machine body drives the connecting rack to slide downward, the connecting rack drives the fixed ratchet to rotate under the meshing action with the connecting gear ring. The rotation of the fixed ratchet will drive the connecting threaded rod to rotate under the action of the connecting pawl and the connecting shaft. The rotation of the connecting threaded rod drives the wire feeding sliding plate to slide under the action of the threaded connection with the wire feeding sliding plate. The sliding of the wire feeding sliding plate drives the lead wires and parts to be fed into the crimping articulated clamp, which is convenient for the replacement wiring pressure head to continuously crimp the lead wires, thereby improving work efficiency and reducing labor intensity.

[0016] In addition, through the setting of the above-mentioned mechanism, the replacement block and the replacement wiring crimping head can be replaced, which reduces the use cost and extends the service life. It also realizes the continuous crimping of the lead wires, improves work efficiency and reduces labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0018] The drawings described below are only related to some embodiments of the present invention, but are not intended to limit the present invention.

[0019] In the attached picture: Figure 1 It is a schematic structural diagram of the main body of the first embodiment of the present invention.

[0020] Figure 2 It is a schematic structural diagram of a cross-section of the crimping hinge clamp of the first embodiment of the present invention.

[0021] Figure 3 It is a schematic structural diagram of the positioning groove of the first embodiment of the present invention.

[0022] Figure 4 It is a schematic structural diagram of a positioning ball according to the first embodiment of the present invention.

[0023] Figure 5 It is a structural schematic diagram of a connecting gear ring according to a second embodiment of the present invention.

[0024] Figure 6 It is a schematic structural diagram of a connecting pawl according to a second embodiment of the present invention.

[0025] Figure 7 It is a schematic structural diagram of a fixing plate according to the second embodiment of the present invention.

[0026] Figure 8 It is a structural schematic diagram of a sliding limit block according to the second embodiment of the present invention.

[0027] Reference numerals list 1. Crimping machine body; 2. Crimping hinge clamp; 201. Positioning ball; 202. Positioning spring; 3. Limiting hinge rod; 4. Fixed rod; 5. Wire feeding sliding plate; 501. Adjusting piece; 502. Adjusting screw; 6. Press head seat; 601. Replacement of wiring press head; 602. Disassembly slot; 7. Fixed guide rod; 8. Wire feeding adjustment plate; 801. Articulated block; 802. Wire feeding extrusion piece; 803. Fixed plate; 804. Sliding limit block; 805. Limiting compression spring; 806. Trapezoidal slot; 807. Pressing operation block; 808. Trapezoidal plug block; 9. Replacement block; 901. Positioning slot; 10. Connecting rack; 11. Connecting gear ring; 1101. Fixed ratchet; 12. Connecting shaft; 1201. Connecting pawl; 1202. Connecting threaded rod. DETAILED DESCRIPTION

[0028] Embodiment 1: Please refer to Figure 1-Figure 4 As shown: The present invention provides a portable railway rail lead wire crimping tool, comprising a crimping body 1, a crimping hinge clamp 2, a limit hinge rod 3, a fixing rod 4, a wire feeding sliding plate 5, a crimping seat 6, a fixed guide rod 7, a wire feeding adjustment plate 8, a hinge block 801, a wire feeding extrusion piece 802, a replacement mechanism and a crimping mechanism; the crimping hinge clamp 2 is hinged at the upper end of the crimping body 1; the limit hinge rod 3 is hinged at the upper end of the crimping body 1; the fixing rod 4 is fixedly connected to the outer side of the crimping body 1; the wire feeding sliding plate 5 slides It is connected to the outer side of the fixed rod 4; the pressure head seat 6 is slidably connected to the upper end of the crimping body 1; a plurality of fixed guide rods 7 are provided, and the plurality of fixed guide rods 7 are fixedly connected to the upper end surface of the wire feeding sliding plate 5; the wire feeding adjustment plate 8 is slidably connected to the outer sides of the plurality of fixed guide rods 7; the hinge block 801 is hinged to the upper end of the wire feeding adjustment plate 8; the wire feeding extrusion piece 802 is threadedly connected to the inner side of the upper end of the hinge block 801; the replacement mechanism is arranged at the upper end of the crimping body 1; the crimping mechanism is arranged on the outer side of the crimping body 1.

[0029] Among them, the replacement mechanism includes: a positioning ball 201, a positioning spring 202, a replacement wiring pressure head 601, a disassembly groove 602, a replacement block 9 and a positioning groove 901; there are two groups of positioning balls 201, and both groups of positioning balls 201 are slidably connected to the inner side of the crimping hinge clamp 2; there are two groups of positioning springs 202, one end of the two groups of positioning springs 202 are respectively fixedly connected to the outer sides of the two groups of positioning balls 201, and the other ends of the two groups of positioning springs 202 are both fixedly connected to the inner side of the crimping hinge clamp 2; the replacement wiring pressure head 601 is threadedly connected to the inner side of the pressure head seat 6; there are two disassembly grooves 602, and both disassembly grooves 602 are opened on the outer side of the replacement wiring pressure head 601; there are two replacement blocks 9, and both replacement blocks 9 are slidably connected to the inner side of the crimping hinge clamp 2; there are two groups of positioning grooves 901, and both groups of positioning grooves 901 are respectively opened on the outer sides of the two replacement blocks 9.

[0030] Specific usage and function of this embodiment: By using tools, the replacement wiring crimping head 601 can be disassembled and replaced, and the replacement block 9 is slidably connected to the inner side of the crimping hinge clamp 2, so that the positioning ball 201 is pressed against the positioning groove 901 under the action of the positioning spring 202, thereby realizing the installation of the replacement block 9, and the replacement block 9 can be disassembled by pushing the replacement block 9 with force.

[0031] Embodiment 2: On the basis of the first embodiment, Figure 5-Figure 8 As shown, the crimping mechanism includes: an adjusting member 501, an adjusting screw 502, a fixing plate 803, a sliding limit block 804, a limit compression spring 805, a trapezoidal slot 806, a pressing operation block 807, a trapezoidal plug block 808, a connecting rack 10, a connecting gear ring 11, a fixed ratchet 1101, a connecting shaft 12, a connecting pawl 1201 and a connecting threaded rod 1202; the adjusting member 501 is rotatably connected to the inner side of the wire feeding sliding plate 5; the adjusting screw 502 is fixedly connected to the upper end surface of the adjusting member 501; the fixed plate 803 is fixedly connected to the outer side of the hinge block 801; there are two sliding limit blocks 804, and the two sliding limit blocks 804 are slidably connected to the inner side of the wire feeding adjustment plate 8; there are two groups of limit compression springs 805, one end of the two groups of limit compression springs 805 are respectively fixedly connected to the outer sides of the two sliding limit blocks 804, and the other ends of the two groups of limit compression springs 805 are fixedly connected to the inner side of the wire feeding adjustment plate 8; there are two trapezoidal slots 806, and the two trapezoidal slots 806 are respectively opened on the inner sides of the two sliding limit blocks 804; there are two pressing operation blocks 807, and the two pressing operation blocks 807 are slidably connected to the inner side of the wire feeding adjustment plate 8; there are two trapezoidal plug blocks 808, and the two trapezoidal plug blocks 808 are respectively fixedly connected to the outer sides of the two pressing operation blocks 807; the connecting rack 10 is fixedly connected to the lower end surface of the pressure head seat 6; the connecting gear The ring 11 is rotatably connected to the inner side of the upper end of the crimping body 1, and the connecting gear ring 11 is meshed with the connecting rack 10; the fixed ratchet 1101 is fixedly connected to the inner side of the connecting gear ring 11; the connecting shaft 12 is rotatably connected to the inner side of the upper end of the crimping body 1; the connecting pawl 1201 is hinged to the outer side of the connecting shaft 12, and a torsion spring is provided at the hinge between the connecting pawl 1201 and the connecting shaft 12; the connecting threaded rod 1202 is fixedly connected to the inner side of the connecting shaft 12.

[0032] The specific usage and function of this embodiment: When the lead wire is crimped, by pushing the pressing operation block 807, the pressing operation block 807 drives the trapezoidal plug block 808 to be inserted into the inner side of the trapezoidal slot 806. At this time, the sliding limit block 804 will slide toward the inner side of the wire feeding adjustment plate 8 under the action of the trapezoidal plug block 808 and the trapezoidal slot 806, so that the hinge block 801 can be opened, and then the lead wire is placed in the upper end of the wire feeding adjustment plate 8 and the hinge block 801 is closed. When the hinge block 801 is closed, the sliding limit block 804 will limit the fixed plate 803 under the action of the limit compression spring 805, rotate the wire feeding extrusion piece 802, so that the wire feeding extrusion piece 802 can squeeze the lead wire under the action of the threaded connection with the hinge block 801, and then open the crimping hinge clamp 2, put the lead wire and the parts to be connected into the inner side of the crimping hinge clamp 2, and then close the crimping hinge clamp 2, at this time, start the crimping machine 1, so that the crimping machine 1 drives the pressure head seat 6 to slide upward through the connecting rack 10, so that the replacement wire pressure head 601 slides upward, and the lead wire is pressed. The wire is crimped with the parts to be connected. When the crimping machine body 1 drives the connecting rack 10 to slide downward, the connecting rack 10 will drive the fixed ratchet 1101 to rotate under the action of meshing with the connecting gear ring 11. The rotation of the fixed ratchet 1101 will drive the connecting threaded rod 1202 to rotate under the action of the connecting pawl 1201 and the connecting shaft 12. The rotation of the connecting threaded rod 1202 will drive the wire feeding sliding plate 5 to slide under the action of the threaded connection with the wire feeding sliding plate 5. The sliding of the wire feeding sliding plate 5 will drive the lead-in The wire and the parts to be connected are fed into the crimping hinge clamp 2, which makes it convenient to replace the wiring crimping head 601 to continuously crimp the lead wire. When the connecting rack 10 slides upward, the connecting pawl 1201 will not engage with the fixed ratchet 1101, and the connecting threaded rod 1202 will not rotate at this time. By rotating the adjusting piece 501, the adjusting piece 501 will drive the adjusting screw 502 to rotate, and the rotation of the adjusting screw 502 will slide under the action of the threaded connection with the wire feeding adjustment plate 8, which can adapt to lead wires of different specifications.

[0033] In this article, there are a few points to note: 1. The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures may refer to general designs.

[0034] 2. In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0035] The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A portable railway rail lead wire crimping tool, comprising a crimping body (1), a crimping hinge clamp (2), a limit hinge rod (3), a fixing rod (4), a wire feeding sliding plate (5), a crimping head seat (6), a fixing guide rod (7), a wire feeding adjustment plate (8), a hinge block (801), a wire feeding extrusion piece (802), a replacement mechanism and a crimping mechanism; the crimping hinge clamp (2) is hinged to the upper end of the crimping body (1); the limit hinge rod (3) is hinged to the upper end of the crimping body (1); and the characteristics are: The fixed rod (4) is fixedly connected to the outer side of the crimping machine body (1); the wire feeding sliding plate (5) is slidably connected to the outer side of the fixed rod (4); the pressure head seat (6) is slidably connected to the upper end of the crimping machine body (1); a plurality of fixed guide rods (7) are provided, and the plurality of fixed guide rods (7) are all fixedly connected to the upper end surface of the wire feeding sliding plate (5); the wire feeding adjustment plate (8) is slidably connected to the outer sides of the plurality of fixed guide rods (7); the hinge block (801) is hinged to the upper end of the wire feeding adjustment plate (8); the wire feeding extrusion piece (802) is threadedly connected to the inner side of the upper end of the hinge block (801); the replacement mechanism is arranged at the upper end of the crimping machine body (1); and the crimping mechanism is arranged on the outer side of the crimping machine body (1).

2. A portable railway rail lead wire pressing tool as claimed in claim 1, characterized in that: The replacement mechanism comprises: a positioning ball (201), a positioning spring (202), a replacement block (9) and a positioning groove (901); the positioning ball (201) is provided in two groups, and the two groups of positioning balls (201) are both slidably connected to the inner side of the crimping hinge clamp (2); the positioning spring (202) is provided in two groups, one end of the two groups of positioning springs (202) is respectively fixedly connected to the outer side of the two groups of positioning balls (201), and the other end of the two groups of positioning springs (202) is both fixedly connected to the inner side of the crimping hinge clamp (2); the replacement block (9) is provided in two groups, and the two replacement blocks (9) are both slidably connected to the inner side of the crimping hinge clamp (2); the positioning groove (901) is provided in two groups, and the two groups of positioning grooves (901) are respectively opened on the outer sides of the two replacement blocks (9).

3. A portable railway rail lead wire pressing tool as claimed in claim 2, characterized in that: The replacement mechanism further comprises: a replacement wiring pressure head (601) and a disassembly groove (602); the replacement wiring pressure head (601) is threadedly connected to the inner side of the pressure head seat (6); and two disassembly grooves (602) are provided, and both disassembly grooves (602) are opened on the outer side of the replacement wiring pressure head (601).

4. A portable railway rail lead wire pressing tool as claimed in claim 1, characterized in that: The crimping mechanism comprises: a connecting rack (10), a connecting gear ring (11) and a fixed ratchet (1101); the connecting rack (10) is fixedly connected to the lower end surface of the crimping head seat (6); the connecting gear ring (11) is rotatably connected to the inner side of the upper end of the crimping machine body (1), and the connecting gear ring (11) is meshed with the connecting rack (10); and the fixed ratchet (1101) is fixedly connected to the inner side of the connecting gear ring (11).

5. A portable railway rail lead wire pressing tool as claimed in claim 4, characterized in that: The crimping mechanism further comprises: a connecting shaft (12), a connecting pawl (1201) and a connecting threaded rod (1202); the connecting shaft (12) is rotatably connected to the inner side of the upper end of the crimping machine body (1); the connecting pawl (1201) is hinged to the outer side of the connecting shaft (12), and a torsion spring is provided at the hinge between the connecting pawl (1201) and the connecting shaft (12); and the connecting threaded rod (1202) is fixedly connected to the inner side of the connecting shaft (12).

6. A portable railway rail lead wire pressing tool as claimed in claim 5, characterized in that: The crimping mechanism further comprises: an adjusting member (501) and an adjusting screw (502); the adjusting member (501) is rotatably connected to the inner side of the wire feeding sliding plate (5); and the adjusting screw (502) is fixedly connected to the upper end surface of the adjusting member (501).

7. A portable railway rail lead wire pressing tool as claimed in claim 6, characterized in that: The crimping mechanism further comprises: a fixed plate (803), a sliding limit block (804) and a limit compression spring (805); the fixed plate (803) is fixedly connected to the outer side of the hinge block (801); two sliding limit blocks (804) are provided, and the two sliding limit blocks (804) are both slidably connected to the inner side of the wire feeding adjustment plate (8); two groups of limit compression springs (805) are provided, one end of the two groups of limit compression springs (805) is respectively fixedly connected to the outer sides of the two sliding limit blocks (804), and the other ends of the two groups of limit compression springs (805) are both fixedly connected to the inner side of the wire feeding adjustment plate (8).

8. A portable railway rail lead wire pressing tool as claimed in claim 7, characterized in that: The crimping mechanism further comprises: a trapezoidal slot (806), a pressing operation block (807) and a trapezoidal plug-in block (808); two trapezoidal slots (806) are provided, and the two trapezoidal slots (806) are respectively opened on the inner sides of the two sliding limit blocks (804); two pressing operation blocks (807) are provided, and the two pressing operation blocks (807) are both slidably connected to the inner side of the wire feeding adjustment plate (8); and two trapezoidal plug-in blocks (808) are provided, and the two trapezoidal plug-in blocks (808) are respectively fixedly connected to the outer sides of the two pressing operation blocks (807).

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