Lead combination device of circuit board electrical element
By designing the lead bonding device for electrical components of the circuit board, and adjusting the positioning groove spacing using the support screw, the equipment replacement problem caused by the fixation of the positioning groove width in the prior art is solved, and flexible positioning and fixing of leads of different diameters is achieved.
Patent Information
- Application Number
- CN202510516336.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-23
- Publication Date
- 2025-07-18
AI Technical Summary
The width of the existing circuit boards is fixed, making it difficult to adapt to leads of different diameters, and the equipment needs to be replaced, which is inconvenient to use.
A lead bonding device for electrical components of circuit boards is designed, including lead plates, positioning slots, limiting plates, support screws and other components. The positioning slot spacing is adjusted by driving the positioning plate displacement through the support screws to adapt to the positioning and fixing of leads of different diameters.
It realizes flexible positioning and fixing of leads of different diameters, avoids equipment replacement, and improves convenience and adaptability.
Smart Images

Figure CN120343824A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of circuit boards, and specifically to a lead bonding device for electrical components of a circuit board. Background Art
[0002] The names of circuit boards include: ceramic circuit boards, alumina ceramic circuit boards, aluminum nitride ceramic circuit boards, printed wiring boards, printed copper etching technology circuit boards, etc. Circuit boards miniaturize and visualize circuits, and play an important role in the mass production of fixed circuits and the optimization of the layout of electrical appliances. When in use, a soldering device is used to fix the leads on the circuit board to connect various electrical components.
[0003] In the prior art, in order to facilitate the positioning of the leads, the leads are first placed in the opened positioning grooves to avoid the leads from shifting during wiring, and then the soldering device can be used to fix the leads on the circuit board, so that the electrical components on the circuit board can be conveniently connected through the leads.
[0004] However, generally, the width of the positioning grooves provided for limiting the leads is fixed. Therefore, when it is necessary to fix leads with different diameters, different lead limiting devices need to be replaced, which makes it inconvenient to use. For this reason, the present invention proposes a lead bonding device for electrical components of a circuit board to solve the above-mentioned technical problems. Summary of the Invention
[0005] The purpose of the present invention is to provide a lead bonding device for electrical components of a circuit board to solve the problems raised in the above background art.
[0006] To achieve the above purpose, the present invention provides the following technical solution: A lead bonding device for electrical components of a circuit board, comprising: a lead soldering device, a support base is arranged on the surface of the lead soldering device, a lead board is arranged on the surface of the support base, a positioning card slot is opened on the surface of the lead board, a storage groove is opened on the side of the positioning card slot, a limiting plate is arranged in the storage groove, a clamping plate is arranged in the limiting plate, and a support bracket is arranged on the side of the clamping plate; A vertical plate, a positioning groove is opened on the surface of the vertical plate, a positioning plate is arranged in the positioning groove, a guiding plate is arranged on the side of the vertical plate, a support screw is arranged in the guiding plate, a fixing plate is arranged at one end of the support screw, an auxiliary plate is arranged at the end face of the vertical plate, an auxiliary groove is opened on the side of the auxiliary plate, and a moving plate is sleeved on the surface of the support screw.
[0007] Preferably, a moving groove is opened on the side of the storage groove, two groups of storage grooves are opened, and the two groups of storage grooves are symmetrically distributed about the long side center line of the surface of the lead board. The storage groove is in an overall square plate structure, and the limiting plate is stored in the storage groove.
[0008] Preferably, through holes are formed in the side surface of the lead board, a limiting bearing is arranged in the through holes, a support rod is fixedly connected to the inner ring surface of the limiting bearing, a left-handed thread is formed on the surface of one end of the support rod, a right-handed thread is formed on the surface of the other end of the support rod, traction plates are respectively screwed to both ends of the support rod, and one end of the traction plate is fixedly connected to the bottom of the limiting plate.
[0009] Preferably, a placement groove is formed in the side surface of the limiting plate, a traction frame is arranged in the placement groove, a baffle is arranged on the end surface of the clamping plate, the baffle is inserted into the traction frame, the baffle is in a square plate structure, a lifting groove is formed in the side surface of the clamping plate, and a lifting opening is formed in the side surface of the lifting groove.
[0010] Preferably, metal elastic sheets are arranged on the side surface of the placement groove, there are multiple groups of metal elastic sheets, the multiple groups of metal elastic sheets are linearly arranged at equal intervals with respect to the side surface of the clamping plate, one end of the metal elastic sheet is fixedly connected to the surface of the placement groove, and the other end of the metal elastic sheet is fixedly connected to the side surface of the clamping plate.
[0011] Preferably, a lifting plate is arranged in the lifting groove, a groove is formed in the end surface of the lifting plate, a rotating rod is arranged in the groove, a damping bearing is sleeved on the surface of the rotating rod, a limiting block is sleeved on the outer ring surface of the damping bearing, the limiting block is in a square plate structure, and the support pallet is in an overall "T" - shaped plate structure, and one end of the support pallet passes through the lifting opening and is fixedly connected to the side surface of the lifting plate.
[0012] Preferably, a bottom plate is arranged on the side surface of the clamping plate, installation grooves are formed in the side surface of the bottom plate, there are multiple groups of installation grooves, the multiple groups of installation grooves are linearly arranged at equal intervals with respect to the side surface of the bottom plate, and one end of the limiting block is inserted into the installation groove.
[0013] Preferably, the vertical plate is fixedly connected to the surface of the lead board, a moving opening is formed in the side surface of the positioning groove, a moving block is arranged on the outer side surface of the positioning plate, the moving block is in an "L" - shaped plate structure, and one end of the moving plate is fixedly connected to the side surface of the moving block.
[0014] Preferably, the guiding plate is fixedly connected to the side surface of the vertical plate, a limiting spring is sleeved on the surface of the supporting screw rod, one end of the limiting spring is fixedly connected to the side surface of the guiding plate, one end of the limiting spring is fixedly connected to the surface of the supporting screw rod, the other end of the limiting spring is fixedly connected to the side surface of the guiding plate, a first bearing is arranged on the side surface of the moving plate, a positioning nut is arranged on the surface of the first bearing, and the positioning nut is screwed on the supporting screw rod.
[0015] Preferably, there are multiple groups of auxiliary grooves, the multiple groups of auxiliary grooves are linearly arranged at equal intervals with respect to the side surface of the auxiliary plate, a second bearing is arranged on the side surface of the fixing plate, one end of the supporting screw rod is fixedly connected to the inner ring surface of the second bearing, and one end of the fixing plate is inserted into the auxiliary groove.
[0016] Compared with the prior art, the beneficial effects of the present invention are: The lead bonding device for circuit board electrical components proposed by the present invention, when in use and when welding the lead to the circuit board is required, first, the lead can be placed in the positioning groove, and then, with the cooperation of the positioning plate and the positioning groove, the two sides of the lead can be positioned, so that it is convenient for the lead welding equipment to fix the lead on the circuit board and connect the electrical components through the lead. When welding leads of different diameters is required, first, the support screw can be directly pulled, so that the support screw drives multiple groups of positioning plates to displace simultaneously, thereby adjusting the distance between the positioning plate and the side of the positioning groove, facilitating subsequent limiting of leads of different diameters, and thus facilitating fixing the leads on the circuit board. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 Schematic diagram of the device of the present invention; Figure 2 Side view of the device of the present invention; Figure 3 Schematic diagram of the lead board structure of the present invention; Figure 4 Schematic diagram of the structure of the lead board when tilted in the present invention; Figure 5 is Figure 4 Enlarged schematic diagram of part A in Figure 6 Front view of the lead board structure of the present invention; Figure 7 Side view of the lead board structure of the present invention; Figure 8 is Figure 6 Enlarged schematic diagram of part B in Figure 9 Partial cross-sectional view of the lead board structure of the present invention; Figure 10 Schematic diagram of the positioning plate structure of the present invention; Figure 11 Schematic diagram of the support pallet structure of the present invention.
[0017] In the figure: 1. Lead welding equipment; 2. Support base; 3. Lead board; 4. Positioning card slot; 5. Storage slot; 6. Limiting plate; 7. Clamping plate; 8. Support tray; 9. Vertical plate; 10. Positioning slot; 11. Positioning plate; 12. Guide plate; 13. Support screw; 14. Fixed plate; 15. Auxiliary plate; 16. Auxiliary slot; 17. Moving plate; 18. Moving slot; 19. Support rod; 20. Traction plate; 21. Placing slot; 22. Traction frame; 23. Baffle; 24. Lifting slot; 25. Lifting opening; 26. Metal elastic sheet; 27. Lifting plate; 28. Groove; 29. Rotating rod; 30. Damping bearing; 31. Limiting block; 32. Bottom plate; 33. Installation slot; 34. Moving block; 35. Limiting spring; 36. First bearing; 37. Positioning nut; 38. Second bearing; 39. Moving opening; 40. Limiting bearing. Detailed implementation manner
[0018] In order to clearly and completely describe the purpose, technical solution of the present invention and make the advantages more clear, the following further details the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, not to limit the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.
[0019] Embodiment 1: Please refer to Figures 1-11 , the present invention provides a technical solution: A lead bonding device for circuit board electrical components, including: a lead welding device 1, a support base 2 is arranged on the surface of the lead welding device 1, a lead board 3 is arranged on the surface of the support base 2, a positioning card slot 4 is opened on the surface of the lead board 3, a storage slot 5 is opened on the side of the positioning card slot 4, a limiting plate 6 is arranged in the storage slot 5, a clamping plate 7 is arranged in the limiting plate 6, and a support tray 8 is arranged on the side of the clamping plate 7; a vertical plate 9, a positioning slot 10 is opened on the surface of the vertical plate 9, a positioning plate 11 is arranged in the positioning slot 10, a guide plate 12 is arranged on the side of the vertical plate 9, a support screw 13 is arranged in the guide plate 12, a fixed plate 14 is arranged at one end of the support screw 13, an auxiliary plate 15 is arranged on the end face of the vertical plate 9, an auxiliary slot 16 is opened on the side of the auxiliary plate 15, and a moving plate 17 is sleeved on the surface of the support screw 13; When it is necessary to weld the lead wire to the circuit board, first, the lead wire can be placed in the positioning groove 10, and then, in cooperation with the setting of the positioning plate 11 and the positioning groove 10, the two sides of the lead wire can be positioned. Thus, it is convenient for the lead wire welding device 1 to fix the lead wire on the circuit board so that the electrical components are connected through the lead wire. When welding leads of different diameters, first, the support screw 13 can be directly pulled, so that the support screw 13 drives multiple groups of positioning plates 11 to displace simultaneously. Thus, the distance between the positioning plate 11 and the side of the positioning groove 10 can be adjusted, which is convenient for subsequent limiting of leads of different diameters and for fixing the lead wire on the circuit board.
[0020] Embodiment 2: On the basis of Embodiment 1, a positioning card slot 4 is provided to facilitate welding the lead wire to the circuit board. A moving slot 18 is provided on the side of the storage slot 5. There are two groups of storage slots 5, and the two groups of storage slots 5 are symmetrically distributed about the long-side center line of the surface of the lead wire board 3. The storage slot 5 is in an overall square plate-like structure. The limiting plate 6 is stored in the storage slot 5. Through holes are provided on the side of the lead wire board 3, and limiting bearings 40 are arranged in the through holes. The inner ring surface of the limiting bearing 40 is fixedly connected with a support rod 19. The surface of one end of the support rod 19 is provided with a left-handed thread, and the surface of the other end of the support rod 19 is provided with a right-handed thread. Traction plates 20 are screwed to both ends of the support rod 19 respectively, and one end of the traction plate 20 is fixedly connected to the bottom of the limiting plate 6; During use, first, the circuit board can be directly placed in the positioning card slot 4, and then, in cooperation with the limiting bearing 40, the support rod 19 can be rotated. Thus, the traction plates 20 screwed to both ends of the support rod 19 can displace along the moving slot 18. When the support rod 19 is rotated, the two traction plates 20 can displace in opposite directions. Thus, the two clamping plates 7 can clamp and position both ends of the circuit board, thereby avoiding the problem of offset during lead wire connection to the circuit board.
[0021] In order to improve the safety during clamping of the circuit board, a metal elastic sheet 26 is provided. A placement groove 21 is provided on the side of the limiting plate 6. A traction frame 22 is arranged in the placement groove 21. A baffle 23 is arranged on the end face of the clamping plate 7, and the baffle 23 is inserted into the traction frame 22. The baffle 23 is in a square plate-like structure. A lifting groove 24 is provided on the side of the clamping plate 7, and a lifting opening 25 is provided on the side of the lifting groove 24. A metal elastic sheet 26 is provided on the side of the placement groove 21. There are multiple groups of metal elastic sheets 26, and the multiple groups of metal elastic sheets 26 are linearly arranged at equal intervals about the side of the clamping plate 7. One end of the metal elastic sheet 26 is fixedly connected to the surface of the placement groove 21, and the other end of the metal elastic sheet 26 is fixedly connected to the side of the clamping plate 7; When in use, when the two sets of clamping plates 7 are displaced by rotating the support rod 19, after the clamping plates 7 contact both sides of the circuit board, the buffer of the metal elastic sheet 26 can be used to avoid the problem that the clamping plates 7 directly and rigidly contact the side of the circuit board and damage the circuit board. The traction frame 22 cooperates with the baffle 23 to prevent the clamping plates 7 from disengaging from the placement groove 21 and can play a role in limiting the clamping plates 7.
[0022] In order to facilitate raising the heights of different circuit boards to facilitate subsequent lead fixing, a support pallet 8 is provided. A lifting plate 27 is arranged in the lifting groove 24. A groove 28 is formed in the end face of the lifting plate 27. A rotating rod 29 is arranged in the groove 28. A damping bearing 30 is sleeved on the surface of the rotating rod 29. A limiting block 31 is sleeved on the outer ring surface of the damping bearing 30. The limiting block 31 is in a square plate-like structure. The support pallet 8 is in an overall "T"-shaped plate-like structure. One end of the support pallet 8 passes through the lifting opening 25 and is fixedly connected to the side of the lifting plate 27. A bottom plate 32 is arranged on the side of the clamping plate 7. An installation groove 33 is formed in the side of the bottom plate 32. Multiple groups of installation grooves 33 are provided. The multiple groups of installation grooves 33 are linearly arranged at equal intervals on the side of the bottom plate 32. One end of the limiting block 31 is inserted into the installation groove 33; When in use, first place the circuit board on the support pallet 8 and fix it in cooperation with the clamping plates 7. Then, the limiting block 31 can be rotated in cooperation with the damping bearing 30 to disengage the limiting block 31 from the installation groove 33. Then, the lifting plate 27 can be lifted. When the lifting plate 27 is moved to an appropriate height, rotate the limiting block 31 again to make one end of the limiting block 31 snap into other installation grooves 33, so that the limiting block 31 after height adjustment can be fixed. Then, it is convenient to adjust the height of circuit boards of different models.
[0023] Embodiment 3: On the basis of Embodiment 2, a positioning plate 11 is provided to facilitate lead positioning. The vertical plate 9 is fixedly connected to the surface of the lead board 3. A moving port 39 is formed in the side of the positioning groove 10. A moving block 34 is arranged on the outer side of the positioning plate 11. The moving block 34 is in an "L"-shaped plate-like structure. One end of the moving plate 17 is fixedly connected to the side of the moving block 34. The guiding plate 12 is fixedly connected to the side of the vertical plate 9. A limiting spring 35 is sleeved on the surface of the support screw 13. One end of the limiting spring 35 is fixedly connected to the side of the guiding plate 12. One end of the limiting spring 35 is fixedly connected to the surface of the support screw 13. The other end of the limiting spring 35 is fixedly connected to the side of the guiding plate 12. A first bearing 36 is arranged on the side of the moving plate 17. A positioning nut 37 is arranged on the surface of the first bearing 36. The positioning nut 37 is screwed on the support screw 13; First, the lead wire can be placed in the positioning groove 10 to avoid the problem of lead wire offset during welding. Then, by pulling the support screw 13, multiple groups of positioning plates 11 can be displaced simultaneously, facilitating the positioning of lead wires with different diameters according to the displacement of the positioning plates 11. When it is necessary to position multiple lead wires with different diameters at one time, the positioning nut 37 can be rotated in cooperation with the first bearing 36, so that the moving plate 17 can be displaced to drive the individual positioning plates 11 to be displaced, thereby limiting the lead wires with different diameters at one time. The limiting spring 35 and the guiding plate 12 can, on the one hand, support the support screw 13 through the guiding plate 12, and on the other hand, can improve the pulling force on the support screw 13 through the elastic force of the limiting spring 35 to play a limiting role on the fixed plate 14.
[0024] To facilitate the positioning of the moved support screw 13, an auxiliary plate 15 is provided. Multiple groups of auxiliary grooves 16 are provided, and the multiple groups of auxiliary grooves 16 are linearly arranged equidistantly on the side of the auxiliary plate 15. A second bearing 38 is provided on the side of the fixed plate 14, and one end of the support screw 13 is fixedly connected to the inner ring surface of the second bearing 38. One end of the fixed plate 14 is inserted into the auxiliary groove 16; During use, after the support screw 13 is pulled, the fixed plate 14 can be rotated in cooperation with the second bearing 38, so that one end of the fixed plate 14 can be conveniently inserted into the auxiliary groove 16, thereby fixing the moved support screw 13. The pulling force of the limiting spring 35 can facilitate the limitation of the fixed plate 14 in the auxiliary groove 16 to prevent the fixed plate 14 from disengaging from the auxiliary groove 16.
[0025] In actual use, when welding the lead wire to the circuit board, first place the lead wire in the positioning groove 10, and then, in cooperation with the positioning plate 11 and the positioning groove 10, position both sides of the lead wire, so that the lead wire welding device 1 can conveniently fix the lead wire on the circuit board to connect electrical components through the lead wire. When welding leads of different diameters, first directly pull the support screw 13, so that the support screw 13 drives multiple groups of positioning plates 11 to move at the same time, thereby adjusting the distance between the positioning plate 11 and the side of the positioning groove 10, facilitating subsequent limiting of leads of different diameters, and thus facilitating fixing the lead wire on the circuit board. When the two clamping plates 7 are displaced by rotating the support rod 19, after the clamping plates 7 contact both sides of the circuit board, the buffer of the metal elastic sheet 26 can be used to avoid the problem that the clamping plates 7 directly and rigidly contact the side of the circuit board and damage the circuit board. The traction frame 22 cooperates with the baffle 23 to prevent the clamping plates 7 from disengaging from the placement groove 21 and can play a role in limiting the clamping plates 7. After moving the lifting plate 27 to an appropriate height, rotate the limiting block 31 so that one end of the limiting block 31 is inserted into other installation grooves 33, thereby fixing the limiting block 31 after adjusting the height, and then facilitating height adjustment of circuit boards of different models.
[0026] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A lead bonding device for circuit board electrical components, comprising: Lead welding equipment (1), a support base (2) is arranged on the surface of the lead welding equipment (1), a lead board (3) is arranged on the surface of the support base (2), and it is characterized in that: a positioning card slot (4) is opened on the surface of the lead board (3), a storage slot (5) is opened on the side of the positioning card slot (4), a limiting plate (6) is arranged in the storage slot (5), a clamping plate (7) is arranged in the limiting plate (6), and a support tray (8) is arranged on the side of the clamping plate (7); A vertical plate (9), a positioning slot (10) is opened on the surface of the vertical plate (9), a positioning plate (11) is arranged in the positioning slot (10), a guide plate (12) is arranged on the side of the vertical plate (9), a support screw rod (13) is arranged in the guide plate (12), a fixing plate (14) is arranged at one end of the support screw rod (13), an auxiliary plate (15) is arranged at the end face of the vertical plate (9), an auxiliary slot (16) is opened on the side of the auxiliary plate (15), and a moving plate (17) is sleeved on the surface of the support screw rod (13).
2. The lead bonding device for a circuit board electrical component according to claim 1, wherein: A moving slot (18) is opened on the side of the storage slot (5), there are two groups of storage slots (5), and the two groups of storage slots (5) are symmetrically distributed about the center line of the long side of the surface of the lead board (3). The storage slot (5) is integrally in the shape of a square plate structure, and the limiting plate (6) is stored in the storage slot (5).
3. The lead bonding device for circuit board electrical components according to claim 1, characterized in that: A through hole is opened on the side of the lead board (3), a limiting bearing (40) is arranged in the through hole, a support rod (19) is fixedly connected to the inner ring surface of the limiting bearing (40), a left-handed thread is opened on the surface of one end of the support rod (19), a right-handed thread is opened on the surface of the other end of the support rod (19), traction plates (20) are respectively screwed at both ends of the support rod (19), and one end of the traction plate (20) is fixedly connected to the bottom of the limiting plate (6).
4. The lead bonding device for circuit board electrical components according to claim 1, characterized in that: A placement slot (21) is opened on the side of the limiting plate (6), a traction frame (22) is arranged in the placement slot (21), a baffle (23) is arranged at the end face of the clamping plate (7), the baffle (23) is inserted into the traction frame (22), the baffle (23) is in the shape of a square plate structure, a lifting slot (24) is opened on the side of the clamping plate (7), and a lifting opening (25) is opened on the side of the lifting slot (24).
5. The lead bonding device for circuit board electrical components according to claim 4, characterized in that: Metal elastic pieces (26) are arranged on the side of the placement slot (21), there are multiple groups of metal elastic pieces (26), and the multiple groups of metal elastic pieces (26) are arranged at equal intervals linearly on the side of the clamping plate (7). One end of the metal elastic piece (26) is fixedly connected to the surface of the placement slot (21), and the other end of the metal elastic piece (26) is fixedly connected to the side of the clamping plate (7).
6. The lead bonding device for a circuit board electrical component according to claim 4, wherein: A lifting plate (27) is arranged in the lifting slot (24), a groove (28) is opened at the end face of the lifting plate (27), a rotating rod (29) is arranged in the groove (28), a damping bearing (30) is sleeved on the surface of the rotating rod (29), a limiting block (31) is sleeved on the outer ring surface of the damping bearing (30), the limiting block (31) is in the shape of a square plate structure, and the support tray (8) is integrally in the shape of a "T" - shaped plate structure. One end of the support tray (8) passes through the lifting opening (25) and is fixedly connected to the side of the lifting plate (27).
7. The lead bonding device for circuit board electrical components according to claim 1, characterized in that: A bottom plate (32) is arranged on the side of the clamping plate (7). An installation groove (33) is formed on the side of the bottom plate (32). A plurality of groups of installation grooves (33) are provided, and the plurality of groups of installation grooves (33) are linearly arranged at equal intervals on the side of the bottom plate (32). One end of the limit block (31) is inserted into the installation groove (33).
8. The lead bonding device for circuit board electrical components according to claim 1, characterized in that: The vertical plate (9) is fixedly connected to the surface of the lead plate (3). A moving port (39) is formed on the side of the positioning groove (10). A moving block (34) is arranged on the outer side of the positioning plate (11). The moving block (34) has an "L"-shaped plate structure. One end of the moving plate (17) is fixedly connected to the side of the moving block (34).
9. The lead bonding device for a circuit board electrical component according to claim 1, characterized in that: The guiding plate (12) is fixedly connected to the side of the vertical plate (9). A limit spring (35) is sleeved on the surface of the support screw (13). One end of the limit spring (35) is fixedly connected to the side of the guiding plate (12). One end of the limit spring (35) is fixedly connected to the surface of the support screw (13). The other end of the limit spring (35) is fixedly connected to the side of the guiding plate (12). A first bearing (36) is arranged on the side of the moving plate (17). A positioning nut (37) is arranged on the surface of the first bearing (36). The positioning nut (37) is screwed on the support screw (13).
10. The lead bonding device for circuit board electrical components according to claim 1, characterized in that: A plurality of groups of auxiliary grooves (16) are provided, and the plurality of groups of auxiliary grooves (16) are linearly arranged at equal intervals on the side of the auxiliary plate (15). A second bearing (38) is arranged on the side of the fixing plate (14). One end of the support screw (13) is fixedly connected to the inner ring surface of the second bearing (38). One end of the fixing plate (14) is inserted into the auxiliary groove (16).