CN221110216U - Be used for sensor soldering tin tool equipment - Google Patents

Abstract

The utility model discloses a soldering tin tool device for a sensor, and particularly relates to the technical field of sensor tools. According to the sensor soldering tool device, circuit boards and sensor elements with different sizes can be positioned and clamped through the positioning structure and the sensor clamping assembly, and meanwhile, the front-back adjusting bracket, the left-right adjusting bracket and the vertical adjusting bracket can be arranged to adjust the positions of the sensor elements in the three-axis direction, so that the sensor welding requirements of different welding plates can be met.

Description

Be used for sensor soldering tin tool equipment

Technical Field

The utility model relates to the technical field of sensor tools, in particular to a soldering tin tool device for a sensor.

Background

The sensor is a detection device which can sense the measured information, can convert the sensed information into an electric signal or other information output in a required form according to a certain rule so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like, is generally used together with a control circuit in daily use, and needs to weld the corresponding sensor at a preset position of a circuit board, and can be assisted by using tools when welding; tooling means refers to facilities for ensuring the production of certain products.

Chinese patent document CN209953961U discloses a sensor welding tool. Including the frock base, set up the circuit board draw-in groove respectively on the three angles of frock base upper surface, correspond circuit board sensor welded position and set up spring needle and circuit board support column, place the rubber cap at spring needle top in order to prevent spring needle damage sensor. The device in the above document uses the spring needle to prop against the sensor, and does not occupy one hand to prop against the sensor any more, so that the two hands can move more flexibly in the welding process, thereby simplifying the operation, reducing the possibility of secondary welding and improving the efficiency.

The device in the above document can make both hands more flexible to move during the welding process, thereby simplifying the operation, but in the actual use process, various circuits and sensors with different specifications exist, and the above cannot be suitable for the welding requirements of circuit boards or sensors with different dimensions.

Disclosure of utility model

The utility model mainly aims to provide a soldering tool device for a sensor, which can effectively solve the problem that the conventional equipment cannot be suitable for welding requirements of various specifications.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

The utility model provides a be used for sensor soldering tin tool equipment, includes the mount table, mount table upper end middle part fixedly connected with location structure, location structure upper end middle part movable mounting has the circuit board, mount table upper end left part and right side respectively fixedly connected with adjust the support from front to back, two adjust the support upper end jointly and be provided with from left to right, control the support front end middle part threaded connection and have perpendicular regulation support, perpendicular regulation support front end bilateral symmetry fixedly connected with sensor clamping assembly, mount table upper end rear portion fixedly connected with smoke and dust exhaust structure, two sensor clamping assembly inboard is movable mounting has sensor element jointly.

Preferably, the location structure includes driving motor, driving motor upper end and mount table bottom fixed connection, the driving motor output runs through the mount table bottom and extends to mount table upper end and fixedly connected with pivot, pivot left end and right-hand member rotate respectively and are connected with the bracing piece, two the equal symmetry of one end that the pivot was kept away from to the bracing piece rotates and is connected with the sliding support, two the sliding support bottom all with mount table upper end sliding connection, two the equal front and back symmetry of one side that the sliding support kept away from each other is connected with the locating wheel subassembly.

Preferably, the positioning wheel assembly comprises positioning wheel brackets, the bottom ends of the four positioning wheel brackets are fixedly connected with opposite sides of the upper end of the positioning wheel assembly, two symmetrical positioning wheel brackets are rotatably connected with right-angle brackets on one sides of the two positioning wheel brackets, and two pulleys are symmetrically rotatably connected with the front part and the rear part of the bottom ends of the right-angle brackets.

Preferably, the front-back adjusting bracket comprises two first supporting plates, two bottom ends of the first supporting plates are fixedly connected with the upper end of the mounting table, the front part and the rear part of the upper end of the first supporting plate, which are positioned on the left side, are connected with a first threaded rod in a rotating mode, the first threaded rod penetrates through the front part of the inner side of the first supporting plate to extend to the front end of the first supporting plate and is fixedly connected with an adjusting spanner, and the front part and the rear part of the front end of the upper end of the first supporting plate, which are positioned on the right side, are connected with a first guide rod in a rotating mode.

Preferably, the left-right adjusting support comprises a sliding cavity, the bottom end of the sliding cavity is in sliding connection with the upper end of a supporting plate, the right end of the sliding cavity is in threaded connection with an outer surface of a threaded rod, the left end of the sliding cavity is in sliding connection with the outer surface of a guide rod, the first threaded rod and the first guide rod penetrate through the front end of the sliding cavity to extend to the rear end of the sliding cavity, the left part and the right part of the inner cavity of the sliding cavity are connected with a second threaded rod in a common rotation mode, and the right part of the inner cavity of the sliding cavity is penetrated by the second threaded rod to extend to the right end of the sliding cavity and is fixedly connected with a second adjusting wrench.

Preferably, the vertical adjusting support comprises a sliding seat, the rear end of the sliding seat is in threaded connection with the outer surface of the threaded rod, the front end of the sliding seat is in sliding connection with a sliding block, the middle part of the upper end of the sliding seat is fixedly connected with a fixing support, the upper end of the fixing support is rotationally connected with an adjusting knob, the inner side of the adjusting knob is in threaded connection with a threaded rod III, the outer surface of the threaded rod III is in sliding connection with the inner side of the fixing support, and the three bottom ends of the threaded rod III are fixedly connected with the upper end of the sliding block.

Preferably, the smoke exhaust structure comprises an exhaust cavity, the bottom end of the exhaust cavity is fixedly connected with the rear part of the upper end of the mounting table, the front end of the exhaust cavity is fixedly connected with a fan, the rear end of the exhaust cavity is fixedly connected with an air pipe, and one end of the air pipe, which is far away from the exhaust cavity, penetrates through the bottom end of the sliding block and extends to the front end of the sliding block.

Preferably, the sensor clamping assembly comprises a second supporting plate, the front end of the second supporting plate is fixedly connected with the left part and the right part of the front end of the sliding block respectively, four compression springs I are fixedly connected to two opposite sides of the second supporting plate in a rectangular distribution mode respectively, clamping plates are fixedly connected to one ends, far away from the second supporting plate, of the first compression springs together, limiting assemblies are symmetrically and fixedly connected to the front part and the rear part of the lower part of one end, close to each other, of the two clamping plates, a second guide rod is fixedly connected to the middle part of one end, close to the second supporting plate, of the two clamping plates, and the two guide rods penetrate through the second supporting plate on the same side respectively and are in sliding connection with the inner side of the second supporting plate.

Preferably, the limiting assembly comprises a compression spring II, one end, close to the clamping plate, of the compression spring II is fixedly connected with the clamping plate, the front end of the compression spring II is fixedly connected with a limiting protruding block, and the outer surface of the limiting protruding block is in sliding connection with the inner side of a through hole formed in the clamping plate.

Compared with the prior art, the utility model has the following beneficial effects:

1. According to the utility model, the sensor elements with different sizes and different specifications can be positioned and clamped through the positioning structure and the sensor clamping assembly, so that the sensor welding requirements of different welding plates can be met, and meanwhile, the positions of the sensor elements can be adjusted in the three-axis direction through the front-back adjusting bracket, the left-right adjusting bracket and the vertical adjusting bracket, so that various products with different welding position requirements can be met, the applicability of tooling equipment is improved, the working efficiency is improved, and meanwhile, rosin smoke generated by welding can be extracted and absorbed through the smoke exhaust structure, and the harm to operators is reduced.

2. According to the utility model, the positions of the sensor clamping assemblies can be comprehensively adjusted through the first threaded rod, the second threaded rod and the third threaded rod, so that the positions of the sensor elements clamped by the sensor clamping assemblies can be adjusted, the welding requirements of different sizes, specifications and positions can be met, the application range of equipment can be improved, the acquisition and purchase of other tools can be reduced, and the production cost can be reduced.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a schematic view of the overall structure of the positioning structure of the present utility model;

FIG. 3 is a schematic view of a rear view of a partial structure of the present utility model;

FIG. 4 is a schematic view of the front-to-back adjusting bracket structure and connection relationship of the present utility model;

FIG. 5 is a schematic view of a sensor clamping assembly according to the present utility model.

In the figure: 1. a mounting table; 2. a positioning structure; 21. a positioning wheel assembly; 211. a pulley; 212. a right angle bracket; 213. a positioning wheel bracket; 22. a sliding support; 23. a support rod; 24. a rotating shaft; 25. a driving motor; 3. a circuit board; 4. adjusting the bracket back and forth; 41. adjusting a first spanner; 42. a first threaded rod; 43. a first supporting plate; 44. a first guide rod; 5. a left-right adjusting bracket; 51. adjusting a second spanner; 52. a second threaded rod; 53. a sliding chamber; 6. a sensor element; 7. a smoke exhaust structure; 71. a fan; 72. an air draft cavity; 73. an air duct; 8. a vertical adjustment bracket; 81. a slide; 82. a fixed bracket; 83. an adjustment knob; 84. a third threaded rod; 85. a sliding block; 9. a sensor clamping assembly; 91. a second supporting plate; 92. compressing a first spring; 93. a second guide rod; 94. a clamping plate; 95. a limit component; 951. compression spring II; 952. and a limit bump.

Detailed Description

The utility model is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the utility model easy to understand.

As shown in FIG. 1, a soldering tin tool device for a sensor comprises a mounting table 1, wherein the middle part of the upper end of the mounting table 1 is fixedly connected with a positioning structure 2, the middle part of the upper end of the positioning structure 2 is movably provided with a circuit board 3, the left part and the right part of the upper end of the mounting table 1 are respectively fixedly connected with a front-back adjusting bracket 4, the upper ends of the two front-back adjusting brackets 4 are jointly provided with a left-right adjusting bracket 5, the middle part of the front end of the left-right adjusting bracket 5 is in threaded connection with a vertical adjusting bracket 8, the front end of the vertical adjusting bracket 8 is fixedly connected with a sensor clamping assembly 9 in bilateral symmetry, the rear part of the upper end of the mounting table 1 is fixedly connected with a smoke exhaust structure 7, and the inner sides of the two sensor clamping assemblies 9 are jointly movably provided with a sensor element 6.

In order to realize the positioning and clamping functions of the circuit board 3 to be welded, as shown in fig. 2, the positioning structure 2 comprises a driving motor 25, the upper end of the driving motor 25 is fixedly connected with the bottom end of the mounting table 1, the output end of the driving motor 25 penetrates through the bottom end of the mounting table 1 and extends to the upper end of the mounting table 1 and is fixedly connected with a rotating shaft 24, the left end and the right end of the rotating shaft 24 are respectively and rotationally connected with supporting rods 23, one ends, far away from the rotating shaft 24, of the two supporting rods 23 are symmetrically and rotationally connected with sliding supports 22, the bottom ends of the two sliding supports 22 are both in sliding connection with the upper end of the mounting table 1, and one sides, far away from each other, of the two sliding supports 22 are symmetrically and fixedly connected with pulleys 211.

In order to achieve the alignment of circuit boards 3 with different sizes and specifications, as shown in fig. 2, the positioning wheel assembly 21 comprises positioning wheel brackets 213, bottom ends of the four positioning wheel brackets 213 are fixedly connected with opposite sides of the upper end of the positioning wheel assembly 21, right angle brackets 212 are rotatably connected to one sides of the two symmetrical positioning wheel brackets 213, which are close to each other, and two positioning wheel brackets 213 are rotatably connected to front and rear parts of the bottom ends of the right angle brackets 212.

The driving motor 25 is controlled to drive the rotating shaft 24 to drive the supporting rod 23 to approach inwards, the sliding support 22 drives the positioning wheel assembly 21 to approach inwards, and when the pulley 211 contacts the circuit board 3, the pulley can drive the circuit board 3 to align and clamp inwards, so that positioning and clamping of the circuit board 3 are completed.

To achieve the front-rear position adjustment of the sensor element 6, as shown in fig. 4, the front-rear adjustment bracket 4 includes two support plates one 43, the bottom ends of the two support plates one 43 are fixedly connected with the upper end of the mounting table 1, the front and rear parts of the upper ends of the support plates one 43 located on the left side are rotatably connected with a threaded rod one 42, the threaded rod one 42 extends to the front end of the support plate one 43 through the front part of the inner side of the support plate one 43 and is fixedly connected with an adjustment wrench one 41, and the front and rear parts of the upper ends of the support plates one 43 located on the right side are rotatably connected with a guide rod one 44.

In order to realize the left and right adjustment of the sensor element 6, as shown in fig. 3 and 4, the left and right adjustment bracket 5 comprises a sliding cavity 53, the bottom end of the sliding cavity 53 is slidably connected with the upper end of the first support plate 43, the right end of the sliding cavity 53 is in threaded connection with the outer surface of the first threaded rod 42, the left end of the sliding cavity 53 is slidably connected with the outer surface of the first guide rod 44, the first threaded rod 42 and the first guide rod 44 extend to the rear end of the sliding cavity 53 through the front end of the sliding cavity 53, the left part and the right part of the inner cavity of the sliding cavity 53 are rotatably connected with a second threaded rod 52, and the second threaded rod 52 extends to the right end of the sliding cavity 53 through the right part of the inner cavity of the sliding cavity 53 and is fixedly connected with an adjustment wrench 51.

In order to realize the vertical height adjustment of the sensor element 6, as shown in fig. 3 and 4, the vertical adjustment support 8 comprises a sliding seat 81, the rear end of the sliding seat 81 is in threaded connection with the outer surface of a second threaded rod 52, the front end of the sliding seat 81 is in sliding connection with a sliding block 85, the middle part of the upper end of the sliding seat 81 is fixedly connected with a fixing support 82, the upper end of the fixing support 82 is rotationally connected with an adjustment knob 83, the inner side of the adjustment knob 83 is in threaded connection with a third threaded rod 84, the outer surface of the third threaded rod 84 is in sliding connection with the inner side of the fixing support 82, and the bottom end of the third threaded rod 84 is fixedly connected with the upper end of the sliding block 85.

Rotating the first adjusting spanner 41 drives the first threaded rod 42 to rotate, so as to drive the second adjusting spanner 51 in threaded connection with the first threaded rod 42 to move forwards and backwards, and thus the front and rear positions of the second adjusting spanner 51 are adjusted; similarly, rotating the second adjusting wrench 51 drives the second threaded rod 52 to rotate, so as to drive the sliding block 85 in threaded connection with the second threaded rod 52 to move left and right, thereby adjusting the left and right positions of the sliding block 85, and after reaching a preset position, rotating the adjusting knob 83 to drive the third threaded rod 84 to drive the sliding block 85 to move downwards, so that the pins of the sensor element 6 are inserted into preset welding holes to be welded.

In order to exhaust smoke dust generated by rosin and soldering tin, as shown in fig. 2 and 5, the smoke dust exhaust structure 7 comprises an exhaust cavity 72, the bottom end of the exhaust cavity 72 is fixedly connected with the rear part of the upper end of the mounting table 1, the front end of the exhaust cavity 72 is fixedly connected with a fan 71, the rear end of the exhaust cavity 72 is fixedly connected with an air pipe 73, and one end of the air pipe 73, far away from the exhaust cavity 72, penetrates through the bottom end of the sliding block 85 and extends to the front end of the sliding block 85.

In order to realize the clamping of the sensor element 6 with different sizes, as shown in fig. 4 and 5, the sensor clamping assembly 9 comprises a second supporting plate 91, the front ends of the second supporting plate 91 are respectively and fixedly connected with the left part and the right part of the front end of the sliding block 85, four first compression springs 92 are respectively and fixedly connected to opposite sides of the second supporting plate 91 in a rectangular distribution mode, the first compression springs 92 can play a supporting role on the clamping plate 94, the clamping plate 94 is tightly attached to the sensor element 6, a limiting assembly 95 arranged on the clamping plate 94 can be tightly attached to the outer surface of the sensor element 6 synchronously, the sensor element 6 is limited, the clamping plates 94 are fixedly connected to one ends, far away from the second supporting plate 91, of the first compression springs 92 on the same side, the front parts and the rear parts of the lower parts of the ends, close to each other, of the two clamping plates 94 are symmetrically and fixedly connected with limiting assemblies 95, the middle parts of one ends, close to the second supporting plate 91, of the two clamping plates 94 are fixedly connected with guide rods 93, and the two guide rods 93 respectively penetrate through the second supporting plate 91 on the same side and are in sliding connection with the inner side of the second supporting plate 91.

In order to limit the clamped sensor element 6, as shown in fig. 4 and 5, the limiting assembly 95 includes a second compression spring 951, one end of the second compression spring 951, which is close to the clamping plate 94, is fixedly connected with the clamping plate 94, the front end of the second compression spring 951 is fixedly connected with a limiting projection 952, and the outer surface of the limiting projection 952 is slidably connected with the inner side of a through hole formed in the clamping plate 94.

When the sensor element 6 is positioned in the clamping plates 94, the sensor element 6 can be tightly clamped between the two clamping plates 94 by the four limiting assemblies 95, so that the functions of auxiliary fixing, inclination prevention and falling-off of the sensor element 6 can be realized; meanwhile, the compression spring II 951 is arranged in the limiting assembly 95, the sensor element 6 can be directly pulled out forwards when the welding is completed and needs to be disassembled, the compression spring II 951 is compressed by the limiting projection 952 under a certain strength, and the sensor element 6 can be directly pulled out at the moment, so that the sensor element 6 is convenient to disassemble.

The working principle of the utility model is as follows: firstly, a circuit board 3 is placed at the upper end of a welding plate positioning structure 2, a driving motor 25 is controlled to enable a rotating shaft 24 to drive a supporting rod 23 to approach inwards, a sliding bracket 22 is enabled to drive a positioning wheel assembly 21 to approach inwards, when a pulley 211 contacts the circuit board 3, the circuit board 3 is driven to be aligned and clamped inwards, and positioning and clamping of the circuit board 3 are completed; the sensor element 6 is placed between the two clamping plates 94, the sensor element 6 is fixed at the corresponding position through the limiting assembly 95, the first adjusting spanner 41 and the second adjusting spanner 51 are rotated to adjust the sensor element 6 to the position where the corresponding circuit board 3 needs to be welded, then the adjusting knob 83 is rotated to enable the third threaded rod 84 to drive the sliding block 85 to move downwards until the pins of the sensor element 6 enter the preset welding position for welding, and smoke dust generated by rosin and soldering tin can be extracted by the fan 71 through the air pipe 73 and discharged to the outside.

The foregoing has shown and described the basic principles and main features of the present utility model and the advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (9)

1. Be used for sensor soldering tin tool equipment, including mount table (1), its characterized in that: the novel intelligent smoke exhaust device is characterized in that a positioning structure (2) is fixedly connected to the middle of the upper end of the mounting table (1), a circuit board (3) is movably mounted at the middle of the upper end of the positioning structure (2), a front-rear adjusting support (4) is fixedly connected to the left part and the right part of the upper end of the mounting table (1), a left-right adjusting support (5) is commonly arranged at the upper end of the front-rear adjusting support (4), a vertical adjusting support (8) is connected to the middle of the front end of the left-right adjusting support (5) through threads, a sensor clamping assembly (9) is symmetrically and fixedly connected to the front end of the vertical adjusting support (8), a smoke exhaust structure (7) is fixedly connected to the rear part of the upper end of the mounting table (1), and a sensor element (6) is movably mounted on the inner side of the sensor clamping assembly (9).

2. The soldering tool device for a sensor according to claim 1, wherein: the positioning structure (2) comprises a driving motor (25), the upper end of the driving motor (25) is fixedly connected with the bottom end of the mounting table (1), the output end of the driving motor (25) penetrates through the bottom end of the mounting table (1) and extends to the upper end of the mounting table (1) and is fixedly connected with a rotating shaft (24), the left end and the right end of the rotating shaft (24) are respectively and rotationally connected with a supporting rod (23), one end, far away from the rotating shaft (24), of each supporting rod (23) is symmetrically and rotationally connected with a sliding support (22), the bottom ends of the sliding supports (22) are fixedly connected with positioning wheel assemblies (21) in a sliding mode, and the two sides, far away from each other, of the sliding supports (22) are symmetrically and fixedly connected with positioning wheel assemblies (21).

3. The soldering tool device for a sensor according to claim 2, wherein: the positioning wheel assembly (21) comprises positioning wheel brackets (213), the bottom ends of the four positioning wheel brackets (213) are fixedly connected with opposite sides of the upper end of the positioning wheel assembly (21), right angle brackets (212) are rotatably connected to one sides of the left and right symmetrical two positioning wheel brackets (213) which are close to each other, and two pulleys (211) are rotatably connected to the front part and the rear part of the bottom end of each right angle bracket (212).

4. The soldering tool device for a sensor according to claim 1, wherein: the front-back adjusting support (4) comprises two first supporting plates (43), the bottom ends of the first supporting plates (43) are fixedly connected with the upper end of the mounting table (1), the front part and the rear part of the upper end of the first supporting plates (43) on the left side are connected with a first threaded rod (42) in a rotating mode, the first threaded rod (42) penetrates through the front part of the inner side of the first supporting plates (43) to extend to the front end of the first supporting plates (43) and is fixedly connected with an adjusting spanner (41), and the front part and the rear part of the upper end of the first supporting plates (43) on the right side are connected with a first guide rod (44) in a rotating mode.

5. The soldering tool device for a sensor of claim 4, wherein: the left-right adjusting support (5) comprises a sliding cavity (53), the bottom end of the sliding cavity (53) is in sliding connection with the upper end of a first supporting plate (43), the right end of the sliding cavity (53) is in threaded connection with the outer surface of a first threaded rod (42), the left end of the sliding cavity (53) is in sliding connection with the outer surface of a first guide rod (44), the first threaded rod (42) and the first guide rod (44) penetrate through the front end of the sliding cavity (53) and extend to the rear end of the sliding cavity (53), a second threaded rod (52) is connected to the left part and the right part of the inner cavity of the sliding cavity (53) in a common rotating mode, and the second threaded rod (52) penetrates through the right part of the inner cavity of the sliding cavity (53) and extends to the right end of the sliding cavity (53) and is fixedly connected with an adjusting wrench II (51).

6. The soldering tool device for a sensor of claim 5, wherein: perpendicular regulation support (8) include slide (81), slide (81) rear end and threaded rod two (52) surface threaded connection, slide (81) front end sliding connection has sliding block (85), slide (81) upper end middle part fixedly connected with fixed bolster (82), fixed bolster (82) upper end rotation is connected with adjust knob (83), adjust knob (83) inboard threaded connection has threaded rod three (84), threaded rod three (84) surface and fixed bolster (82) inboard sliding connection, threaded rod three (84) bottom and sliding block (85) upper end fixed connection.

7. The soldering tool device for a sensor of claim 6, wherein: the smoke exhaust structure (7) comprises an exhaust cavity (72), the bottom end of the exhaust cavity (72) is fixedly connected with the rear part of the upper end of the mounting table (1), the front end of the exhaust cavity (72) is fixedly connected with a fan (71), the rear end of the exhaust cavity (72) is fixedly connected with an air pipe (73), and one end of the air pipe (73) away from the exhaust cavity (72) penetrates through the bottom end of the sliding block (85) and extends to the front end of the sliding block (85).

8. The soldering tool device for a sensor of claim 6, wherein: the sensor clamping assembly (9) comprises a second supporting plate (91), the front end of the second supporting plate (91) is fixedly connected with the left part and the right part of the front end of the sliding block (85) respectively, four compression springs (92) are fixedly connected to opposite sides of the second supporting plate (91) respectively in a rectangular distribution mode, clamping plates (94) are fixedly connected to one ends, far away from the second supporting plate (91), of the first compression springs (92), two clamping plates (94) are symmetrically and fixedly connected with limiting assemblies (95) at the front part and the rear part of the lower part of one end, close to each other, of the two clamping plates (94) respectively, guide rods (93) are fixedly connected to the middle part of one end, close to the second supporting plate (91), of the same side are penetrated through the second supporting plate (91) of the same side respectively, and are in sliding connection with the inner side of the second supporting plate (91).

9. The solder tooling device for a sensor of claim 8, wherein: the limiting assembly (95) comprises a compression spring II (951), one end, close to the clamping plate (94), of the compression spring II (951) is fixedly connected with the clamping plate (94), the front end of the compression spring II (951) is fixedly connected with a limiting projection (952), and the outer surface of the limiting projection (952) is in sliding connection with the inner side of a through hole formed in the clamping plate (94).