Diamond wire electroplating equipment reel convenient to replace

Abstract

The utility model discloses a reel of diamond wire electroplating equipment, which is convenient to replace and install and comprises a large winding roller, a left roller piece is positioned on one side of the large winding roller, a right roller piece is positioned on the other side of the large winding roller, and a V-shaped groove small roller is movably arranged in a groove of a grooved wheel. A plurality of groups of conducting rods are arranged on the outer ring of the large winding roller on the outer side of the V-shaped groove small roller, and the conducting rods rotate on the outer ring of the large winding roller; the interior of the right roller piece is a metal structure, and the exterior of the right roller piece is an injection molding structure. And the V-shaped groove small roller independently moves relative to the winding large roller. The reel of the diamond wire electroplating equipment convenient to replace is long in service life, greatly solves the problem of wire grinding, expands with heat and contracts with cold, is small in deformation, is low in accessory replacement cost, does not need to disassemble a large roller during accessory replacement, is rapid and convenient to replace, is adjusted by a conducting rod through one key, is high in precision, and is integrally formed through mold injection molding or stamping.

Description

Technical Field

[0001] The utility model relates to the field of diamond wire electroplating processing, in particular to a winding wheel of diamond wire electroplating equipment which is convenient to replace. Background Art

[0002] The winding wheel of diamond wire electroplating equipment is a supporting device for winding the diamond wire during processing. Diamond wire is the abbreviation of diamond cutting wire, also known as diamond cutting wire or diamond wire. Electroplating is required when the diamond wire is processed. With the continuous development of science and technology, people have higher and higher requirements on the manufacturing process of the winding wheel of diamond wire electroplating equipment.

[0003] The existing winding wheels of diamond wire electroplating equipment have certain disadvantages when in use. First of all, the existing winding wheels are prone to wire wearing during use, have a short service life, and have a large deformation, which is not conducive to people's use. In addition, it is not very convenient to disassemble and replace, and the overall disassembly and assembly is costly, which brings certain adverse effects to people's use process. For this reason, we propose a winding wheel for diamond wire electroplating equipment that is easy to replace. Utility Model Content

[0004] Technical problems solved: In view of the shortcomings of the prior art, the utility model provides a winding wheel for diamond wire electroplating equipment that is easy to replace and has a long service life. It greatly solves the problem of wire grinding, and has small deformation due to thermal expansion and contraction. The cost of replacing accessories is low, and there is no need to dismantle the large drum to replace accessories. Replacement is quick and convenient. The conductive rod can be adjusted with one button and has high precision. The accessories are integrally formed by mold injection or stamping, which can effectively solve the problems in the background technology.

[0005] Technical solution: To achieve the above purpose, the technical solution adopted by the utility model is: a winding wheel of a diamond wire electroplating device that is easy to replace, including a large winding roller, a left roller sheet is positioned on one side of the large winding roller, a right roller sheet is positioned on the other side of the large winding roller, a plurality of groups of grooved wheel grooves are provided on the surface of the large winding roller, a small V-groove roller is movably arranged inside the grooved wheel groove, both ends of the large winding roller are located at the outer positions of the left roller sheet and the right roller sheet, and an intermediate shaft is arranged in the middle of the large winding roller;

[0006] The outer ring of the winding large roller is located outside the V-groove small roller and is provided with a plurality of sets of conductive rods, and the conductive rods rotate on the outer ring of the winding large roller;

[0007] The conductive rod rotates and adopts a pressure plate press-fit structure, the conductive rod passes through the positions of the left roller sheet and the right roller sheet, the position where the conductive rod contacts the left roller sheet is provided with a first pressure plate, and the position where the conductive rod contacts the right roller sheet is provided with a second pressure plate, the two ends of the conductive rod are respectively press-fitted and limited by the first pressure plate and the second pressure plate, the first pressure plate and the second pressure plate adopt a one-to-two structure, and the first pressure plate and the second pressure plate are both fixed through the screw holes in the middle, a large gear and a small gear are provided on the right roller sheet, wherein the small gear is located on the side of the second pressure plate, the conductive rod passes through the inner wall of the second pressure plate and extends out, and the end of the conductive rod is welded and positioned with the small gear, the large gear drives the small gear to rotate, and the small gear drives the conductive rod to rotate;

[0008] The interior of the right drum sheet is a metal structure, and the exterior of the right drum sheet is an injection molding structure;

[0009] The V-groove small roller moves independently relative to the large winding roller, and the V-groove small roller is located at the outer ring of the large winding roller in a segmented structure or a whole segment structure.

[0010] As a preferred technical solution of the present application, the V-groove small roller includes a V-shaped wheel, a V-groove shaft, a wheel cover, a baffle and steel balls. The wheel cover is located at both ends of the V-shaped wheel, the V-groove shaft is located in the middle of the V-shaped wheel, and the baffle and steel balls are located between the V-shaped wheel and the V-groove shaft.

[0011] As a preferred technical solution of the present application, the right drum sheet includes a second rod groove, a metal frame, rubber coating, a second positioning axis, a second middle groove and reinforcing ribs. The rubber coating covers the position of the metal frame, the second middle groove is located in the middle of the metal frame, the reinforcing ribs are located on the surface of the metal frame, and a second pressure plate is arranged on the right drum sheet at the position of the second rod groove.

[0012] As a preferred technical solution of the present application, the left roller sheet includes a first rod groove, a first middle groove, a first positioning axis and a metal plate. The first rod groove is located on the outer wall of the metal plate, the first middle groove is located in the middle of the metal plate, the first positioning axis is located on the surface of the metal plate, and a first pressure plate is arranged on the left roller sheet at the position of the first rod groove.

[0013] As a preferred technical solution of the present application, the V-groove small roller is engaged in the internal position of the groove wheel groove and rotates, the large winding roller is fixed between the left drum sheet and the right drum sheet, the large winding roller rotates through the intermediate shaft, and the conductive rod rotates on the surface of the large winding roller.

[0014] As a preferred technical solution of the present application, both ends of the V-shaped wheel are positioned by wheel covers, and the V-shaped wheel rotates on the outer wall of the V-groove shaft through baffles and steel balls.

[0015] As a preferred technical solution of the present application, the metal skeleton and the rubber bag are wrapped and positioned, and fixed by a second positioning shaft, the metal skeleton and the reinforcing ribs are integrally formed by die-casting, a large gear and a small gear are arranged on the side of the right drum sheet, wherein the small gear is located on the side of the second pressure plate, a conductive rod is movably arranged on the inner wall of the second pressure plate, and the conductive rod is welded and positioned through the position of the small gear, the large gear drives the small gear to rotate, and the small gear drives the conductive rod to rotate.

[0016] As a preferred technical solution of the present application, the metal plate and the first rod groove are integrally formed by die-casting, and the metal plate is fixed by a first positioning shaft.

[0017] Beneficial effects: Compared with the prior art, the utility model provides a winding wheel for diamond wire electroplating equipment that is easy to replace, and has the following beneficial effects: the winding wheel for diamond wire electroplating equipment that is easy to replace has a long service life, greatly solves the problem of wire grinding, has thermal expansion and contraction, small deformation, low cost for replacing accessories, and no need to dismantle the large roller for replacing accessories, which is quick and convenient to replace. The conductive rod can be adjusted with one key and has high precision. The accessories are integrally formed by mold injection or stamping, and the V-groove roller is rotating, adopting a metal plus rubber-coated structure. The wire is positioned on the V-groove wheel, and the V-groove wheel is dragged to rotate when the wire rotates, so as to reduce friction, and the injection molded product It includes a metal frame, which is directly positioned with the intermediate shaft and the positioning shaft. The most vulnerable part of the large drum is the wear of the wire positioning part. It is now replaced with a V-groove wheel, which can be disassembled and assembled separately to avoid replacing the entire drum. The V-groove wheel can be directly removed and replaced on the drum. The conductive rod is welded to the pinion gear, and all the pinion gears are driven to rotate by the large gear. All conductive rods can be adjusted with one click. The V-groove wheel and the drum sheet are integrally injection molded to ensure uniform precision. The metal frame in the drum sheet is integrally stamped to ensure precision within 2 wires. The winding wheel of the entire diamond wire electroplating equipment has a simple structure, is easy to operate, and has a better effect than the traditional method. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The utility model is a schematic diagram of the overall structure of a winding wheel of a diamond wire electroplating device which is easy to replace.

[0019] Figure 2 It is a structural schematic diagram of the main view of the winding wheel of the diamond wire electroplating equipment which is easy to replace according to the utility model.

[0020] Figure 3 It is a structural schematic diagram of a side view of a winding wheel of a diamond wire electroplating device which is convenient to replace according to the utility model.

[0021] Figure 4This is a structural schematic diagram of an enlarged view of point A in a winding wheel of a diamond wire electroplating device that is easy to replace according to the utility model.

[0022] Figure 5 The utility model is a schematic diagram of the structure of a winding wheel intermediate pressure plate of a diamond wire electroplating device which is easy to replace.

[0023] Figure 6 The utility model is a schematic structural diagram of a V-groove small roller in a winding wheel of a diamond wire electroplating device which is easy to replace.

[0024] Figure 7 The utility model is a schematic structural diagram of a cross-section of a small V-groove roller in a winding wheel of a diamond wire electroplating device which is easy to replace.

[0025] Figure 8 The utility model is a schematic diagram of the structure inside the right roller in the winding wheel of the diamond wire electroplating equipment which is easy to replace.

[0026] Fig. 9 It is a structural schematic diagram of the main view inside the right roller sheet in the winding wheel of the diamond wire electroplating equipment which is easy to replace according to the utility model.

[0027] Fig.10 It is a structural schematic diagram of the inner side view of the right roller sheet in the winding wheel of the diamond wire electroplating equipment with convenient replacement according to the utility model.

[0028] Fig.11 It is a structural schematic diagram of the left roller in the winding wheel of the diamond wire electroplating equipment which is easy to replace according to the utility model.

[0029] Fig.12 It is a structural schematic diagram of the front view of the left roller in the winding wheel of the diamond wire electroplating equipment which is easy to replace according to the utility model.

[0030] In the figure: 1. large winding roller; 2. left roller sheet; 3. right roller sheet; 4. V-groove small roller; 5. groove wheel groove; 6. intermediate shaft; 7. limiter; 8. conductive rod; 9. first pressure plate; 10. second pressure plate; 11. V-shaped wheel; 12. V-groove shaft; 13. wheel cover; 14. baffle; 15. steel ball; 16. second rod groove; 17. metal frame; 18. rubber bag; 19. second positioning shaft; 20. second middle groove; 21. reinforcing rib; 22. first rod groove; 23. first middle groove; 24. first positioning shaft; 25. metal plate. DETAILED DESCRIPTION

[0031] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings and specific embodiments, but those skilled in the art will understand that the embodiments described below are part of the embodiments of the utility model, rather than all of the embodiments, and are only used to illustrate the utility model, and should not be considered as limiting the scope of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the utility model. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figure 1-12 As shown, a winding wheel of a diamond wire electroplating device with convenient replacement includes a large winding roller 1, a left roller sheet 2 is positioned on one side of the large winding roller 1, a right roller sheet 3 is positioned on the other side of the large winding roller 1, a plurality of groups of grooved wheel grooves 5 are provided on the surface of the large winding roller 1, a small V-groove roller 4 is movably provided inside the grooved wheel groove 5, both ends of the large winding roller 1 are located at the outer sides of the left roller sheet 2 and the right roller sheet 3, and an intermediate shaft 6 is provided in the middle of the large winding roller 1;

[0035] A plurality of conductive rods 8 are arranged on the outer ring of the winding large roller 1, which is located outside the V-groove small roller 4, and the conductive rods 8 rotate on the outer ring of the winding large roller 1;

[0036] The conductive rod 8 rotates and adopts a pressure plate press-fit structure. The conductive rod 8 passes through the positions of the left roller sheet 2 and the right roller sheet 3. The position where the conductive rod 8 contacts the left roller sheet 2 is provided with a first pressure plate 9, and the position where the conductive rod 8 contacts the right roller sheet 3 is provided with a second pressure plate 10. The two ends of the conductive rod 8 are respectively press-fitted and limited by the first pressure plate 9 and the second pressure plate 10. The first pressure plate 9 and the second pressure plate 10 adopt a one-to-two structure, and the first pressure plate 9 and the second pressure plate 10 are fixed through the screw holes in the middle. A large gear and a small gear are provided on the right roller sheet 3, wherein the small gear is located on the side of the second pressure plate 10. The conductive rod 8 passes through the inner wall of the second pressure plate 10 and extends out, and the end of the conductive rod 8 is welded and positioned with the small gear. The large gear drives the small gear to rotate, and the small gear drives the conductive rod 8 to rotate;

[0037] The inside of the right drum sheet 3 is a metal structure, and the outside of the right drum sheet 3 is an injection molding structure;

[0038] The V-groove small roller 4 moves independently relative to the winding large roller 1, and the V-groove small roller 4 is one of a segmented structure and a whole segment structure at the outer ring position of the winding large roller 1;

[0039] Long service life, greatly solve the problem of wire grinding, thermal expansion and contraction, small deformation, low cost of replacing accessories, no need to dismantle the large roller to replace accessories, quick and convenient replacement, conductive rod adjustment, one-button adjustment, high precision, accessories are molded in one piece by mold injection or stamping.

[0040] Furthermore, the V-groove small roller 4 includes a V-shaped wheel 11, a V-groove shaft 12, a wheel cover 13, a baffle 14 and a steel ball 15. The wheel cover 13 is located at both ends of the V-shaped wheel 11, the V-groove shaft 12 is located in the middle of the V-shaped wheel 11, and the baffle 14 and the steel ball 15 are located between the V-shaped wheel 11 and the V-groove shaft 12.

[0041] Furthermore, the right roller sheet 3 includes a second rod groove 16, a metal frame 17, a rubber bag 18, a second positioning axis 19, a second middle groove 20 and a reinforcing rib 21. The rubber bag 18 covers the position of the metal frame 17, the second middle groove 20 is located in the middle of the metal frame 17, the reinforcing rib 21 is located on the surface of the metal frame 17, and a second pressure plate 10 is arranged on the right roller sheet 3 at the position of the second rod groove 16.

[0042] Furthermore, the left drum sheet 2 includes a first rod groove 22, a first middle groove 23, a first positioning shaft 24 and a metal plate 25. The first rod groove 22 is located on the outer wall of the metal plate 25, the first middle groove 23 is located in the middle of the metal plate 25, the first positioning shaft 24 is located on the surface of the metal plate 25, and a first pressure plate 9 is arranged on the left drum sheet 2 at the position of the first rod groove 22.

[0043] Furthermore, the V-groove small roller 4 is engaged in the internal position of the groove wheel groove 5 and rotates, and the large winding roller 1 is fixed between the left drum sheet 2 and the right drum sheet 3. The large winding roller 1 rotates through the intermediate shaft 6, and the conductive rod 8 rotates on the surface of the large winding roller 1.

[0044] Furthermore, both ends of the V-shaped wheel 11 are positioned by wheel covers 13 , and the V-shaped wheel 11 rotates on the outer wall of the V-groove shaft 12 through the baffle 14 and the steel ball 15 .

[0045] Furthermore, the metal frame 17 and the rubber bag 18 are wrapped and positioned, and fixed by the second positioning shaft 19. The metal frame 17 and the reinforcing rib 21 are integrally formed by die-casting. A large gear and a small gear are arranged on the side of the right drum sheet 3, wherein the small gear is located on the side of the second pressure plate 10. A conductive rod 8 is movably arranged on the inner wall of the second pressure plate 10, and the conductive rod 8 is welded and positioned by passing through the position of the small gear. The large gear drives the small gear to rotate, and the small gear drives the conductive rod 8 to rotate.

[0046] Furthermore, the metal plate 25 and the first rod groove 22 are integrally formed by die-casting, and the metal plate 25 is fixed by the first positioning shaft 24 .

[0047] Working principle: The utility model includes a large winding roller 1, a left roller sheet 2, a right roller sheet 3, a V-groove small roller 4, a groove wheel groove 5, an intermediate shaft 6, a limiter 7, a conductive rod 8, a first pressure plate 9, a second pressure plate 10, a V-shaped wheel 11, a V-groove shaft 12, a wheel cover 13, a baffle 14, a steel ball 15, a second rod groove 16, a metal skeleton 17, a rubber bag 18, a second positioning shaft 19, a second middle groove 20, a reinforcing rib 21, a first rod groove 22, a first middle groove 23, a first positioning shaft 24, and a metal plate 25. When in use, the V-groove roller rotates, and a metal plus rubber bag structure is adopted. The positioning of the line is on the V-groove wheel. When the line rotates, it drags the V-groove wheel to rotate, so as to reduce friction. The injection molded product contains a metal skeleton, a metal skeleton Directly positioned with the intermediate shaft and the positioning shaft, the most vulnerable part of the large drum is the wear and tear of the wire positioning part. It is now replaced with a V-groove wheel. The V-groove wheel can be disassembled and assembled separately to avoid replacing the entire drum. The V-groove wheel can be directly removed from the drum and replaced. The conductive rod is welded to the pinion, and all the pinions are driven to rotate by the large gear. All conductive rods can be adjusted with one click. The V-groove wheel and the drum sheet are integrally injection molded to ensure their uniform precision. The metal skeleton in the drum sheet is integrally stamped to ensure the precision of 2 wires, long service life, greatly solve the problem of wire grinding, thermal expansion and contraction, small deformation, low cost of replacing accessories, no need to disassemble the large drum to replace accessories, quick and convenient replacement, conductive rod adjustment, one-click adjustment, high precision, accessories are integrally molded by mold injection or stamping.

[0048] It should be noted that, in this article, relational terms such as first and second (number one, number two), etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0049] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. The technicians in this industry should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A winding wheel for diamond wire electroplating equipment that is easy to replace, comprising a large winding roller (1), characterized in that: A left roller sheet (2) is positioned on one side of the large winding roller (1), and a right roller sheet (3) is positioned on the other side of the large winding roller (1). A plurality of groups of grooved wheel grooves (5) are provided on the surface of the large winding roller (1), and a small V-grooved roller (4) is movably provided inside the grooved wheel groove (5). Limiters (7) are positioned at the outer sides of the left roller sheet (2) and the right roller sheet (3) at both ends of the large winding roller (1), and an intermediate shaft (6) is provided in the middle of the large winding roller (1); The outer ring of the large winding roller (1) is provided with a plurality of groups of conductive rods (8) at a position outside the V-groove small roller (4), and the conductive rods (8) are capable of self-rotation on the outer ring of the large winding roller (1); The conductive rod (8) rotates and adopts a pressure plate press-fit structure. The conductive rod (8) passes through the positions of the left roller sheet (2) and the right roller sheet (3). A first pressure plate (9) is provided at the position where the conductive rod (8) contacts the left roller sheet (2). A second pressure plate (10) is provided at the position where the conductive rod (8) contacts the right roller sheet (3). The two ends of the conductive rod (8) are respectively press-fitted and limited by the first pressure plate (9) and the second pressure plate (10). The first pressure plate (9) and the second pressure plate (10) adopt a one-to-two structure, and the first pressure plate (9) and the second pressure plate (10) are both fixed through screw holes in the middle. A large gear and a small gear are provided on the right roller sheet (3), wherein the small gear is located on the side of the second pressure plate (10). The conductive rod (8) passes through the inner wall of the second pressure plate (10) and extends out, and the end of the conductive rod (8) is welded to the small gear for positioning. The large gear drives the small gear to rotate, and the small gear drives the conductive rod (8) to rotate. The interior of the right roller sheet (3) is a metal structure, and the exterior of the right roller sheet (3) is an injection-molded structure; The V-groove small roller (4) moves independently relative to the winding large roller (1), and the V-groove small roller (4) is one of a segmented structure and a whole segment structure at the outer ring position of the winding large roller (1).

2. The wire winding wheel of the diamond wire electroplating equipment with convenient replacement according to claim 1, characterized in that: The V-groove small roller (4) comprises a V-shaped wheel (11), a V-groove shaft (12), a wheel cover (13), a baffle (14) and a steel ball (15), wherein the wheel cover (13) is located at both ends of the V-shaped wheel (11), the V-groove shaft (12) is located in the middle of the V-shaped wheel (11), and the baffle (14) and the steel ball (15) are located between the V-shaped wheel (11) and the V-groove shaft (12).

3. The wire winding wheel of the diamond wire electroplating equipment with convenient replacement according to claim 1, characterized in that: The right roller sheet (3) comprises a second rod groove (16), a metal frame (17), a rubber coating (18), a second positioning shaft (19), a second middle groove (20) and a reinforcing rib (21), wherein the rubber coating (18) covers the position of the metal frame (17), the second middle groove (20) is located in the middle of the metal frame (17), the reinforcing rib (21) is located on the surface of the metal frame (17), and a second pressing plate (10) is provided on the right roller sheet (3) at the position of the second rod groove (16).

4. The wire winding wheel of the diamond wire electroplating equipment with convenient replacement according to claim 1, characterized in that: The left roller sheet (2) comprises a first rod groove (22), a first middle groove (23), a first positioning shaft (24) and a metal plate (25); the first rod groove (22) is located on the outer wall of the metal plate (25); the first middle groove (23) is located in the middle of the metal plate (25); the first positioning shaft (24) is located on the surface of the metal plate (25); and a first pressing plate (9) is provided on the left roller sheet (2) at the position of the first rod groove (22).

5. The wire winding wheel of the diamond wire electroplating equipment with convenient replacement according to claim 1, characterized in that: The V-groove small roller (4) is engaged in an inner position of the groove wheel groove (5) and is rotatable. The large winding roller (1) is fixed between the left roller sheet (2) and the right roller sheet (3). The large winding roller (1) is rotatable via an intermediate shaft (6). The conductive rod (8) is rotatable on the surface of the large winding roller (1).

6. The wire winding wheel of the diamond wire electroplating equipment with convenient replacement according to claim 2, characterized in that: The two ends of the V-shaped wheel (11) are positioned by wheel covers (13), and the V-shaped wheel (11) rotates on the outer wall of the V-groove shaft (12) through a baffle (14) and a steel ball (15).

7. The wire winding wheel of the diamond wire electroplating equipment with convenient replacement according to claim 3, characterized in that: The metal frame (17) and the rubber coating (18) are wrapped and positioned, and fixed by a second positioning shaft (19); the metal frame (17) and the reinforcing rib (21) are integrally formed by die-casting.

8. The wire winding wheel of the diamond wire electroplating equipment with convenient replacement according to claim 4, characterized in that: The metal plate (25) and the first rod groove (22) are integrally formed by die-casting, and the metal plate (25) is fixed by a first positioning shaft (24).

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