A reversible spot welding tool

Abstract

The invention provides a reversible spot welding tool, including a welding plate, a support assembly for supporting the welding plate, and a welding clamp for welding the welding plate; the support assembly includes a ground mounting groove, a movable plate mounted on the ground mounting groove, and a folding assembly mounted on the movable plate; the movable plate is slidably connected to the ground mounting groove, the folding assembly is fixed on the top of the movable plate, a support block is provided on the top of the movable plate, the welding plate is mounted on the support block, and the support assembly is flipped to avoid the welding clamp, so that the welding clamp can drive in from one end and out from the other end. The reversible spot welding tool described in the invention can realize all spot welding at one time, avoid moving the workpiece, secondary (multiple) spot welding, improve spot welding efficiency, and is suitable for spot welding of structural parts with higher cross-sections.

Description

Technical Field

[0001] The invention belongs to the technical field of rail vehicles, and in particular relates to a reversible spot welding tool. Background Art

[0002] Prior art: When spot welding large components of rail vehicles (C-type welding clamps), the large components of the vehicle are placed on the tooling, the C-type welding clamps enter from the side of the large components, and the electrodes of the C-type welding clamps reach the spot welding position for spot welding.

[0003] The disadvantages of the prior art are as follows: ① When the C-type welding clamp enters from the side of the workpiece, the height of the workpiece must not be greater than the opening height of the C-type welding clamp, which has certain limitations; ② During the spot welding process of the C-type welding clamp, due to the interference problem of tooling, the welding clamp needs to avoid the tooling when it moves to the tooling support position, and the welding point at the tooling interference position needs to move the workpiece before spot welding. This spot welding method has a long moving distance for the welding clamp and low spot welding efficiency. Summary of the invention

[0004] In view of this, the invention aims to propose a reversible spot welding tool to solve the problem that the welding clamp cannot perform spot welding due to the high cross-section of the spot welding part, and the problem that the tool and the welding clamp interfere with each other during spot welding and the workpiece needs to be moved to perform the spot filling process, resulting in low spot welding efficiency.

[0005] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0006] A reversible spot welding tool comprises a welding plate, a supporting assembly for supporting the welding plate, and a welding clamp for welding the welding plate;

[0007] The support assembly includes a ground mounting groove, a movable plate mounted on the ground mounting groove, and a folding assembly mounted on the movable plate;

[0008] The movable plate is slidably connected to the ground mounting groove, the folding assembly is fixed on the top of the movable plate, a support block is provided on the top of the movable plate, the welding plate is mounted on the support block, and the support assembly is flipped to allow the welding clamp to move in from one end and move out from the other end to reach the welding point position.

[0009] Furthermore, the ground mounting groove includes three T-shaped slide grooves, a transmission component is installed in each of the T-shaped slide grooves, a rack is installed on the transmission component, and the rack is located in the T-shaped slide groove.

[0010] Furthermore, the transmission assembly includes a first drive motor, two first gears, and two groups of chains. Two first gear mounting grooves are respectively provided at both ends of the ground mounting groove, and the two first gear mounting grooves are communicated with the T-shaped slide groove. The two first gears are respectively installed in the two first gear mounting grooves. A first drive motor mounting seat is provided between the two first gear mounting grooves. The first drive motor is installed on the first drive motor mounting seat. The first drive motor shaft is respectively connected to the two first gears, and the first gear extends into the T-shaped slide groove. The two groups of chains are respectively meshed through the first gears opposite to each other at both ends of the ground mounting groove, and the two groups of chains are respectively located in the T-shaped slide grooves.

[0011] Furthermore, the rack is segmented, and each segment of the rack is correspondingly fixed on two adjacent chain links.

[0012] Furthermore, a plurality of movable plate mounting holes are provided on the top of the ground mounting groove, and the plurality of movable plate mounting holes are respectively communicated with the T-shaped slide groove, and a T-shaped slider corresponding to the T-shaped slide groove is provided at the bottom of each movable plate, and the size of the movable plate mounting hole corresponds to the width of the bottom of the T-shaped slider, and the T-shaped slider is installed in the T-shaped slide groove.

[0013] Furthermore, two T-shaped sliders are respectively provided with a second gear mounting groove, and another T-shaped slider is provided with a third gear mounting groove, the two second gear mounting grooves are adjacent, the third gear mounting groove is located at the edge of the ground mounting groove, a second gear is installed in the second gear mounting groove, a second drive motor mounting seat is provided between the two second gear mounting grooves, a second drive motor is installed on the second drive motor mounting seat, the second drive motor shaft is respectively connected to the second gears on both sides of the second drive motor, a third gear is installed in the third gear mounting groove, a third drive motor mounting seat is provided between the third gear mounting groove and the adjacent second gear mounting groove, a third drive motor is installed on the third drive motor mounting seat, the third drive motor shaft is connected to the third gear, and the second gear and the third gear are respectively meshed with the rack.

[0014] Furthermore, a plurality of mounting holes are provided on the top of the movable plate, and the folding assembly is installed in the mounting holes by means of bolts.

[0015] Furthermore, the folding assembly includes a fixed seat, a column installed on the fixed seat, a jack installed on the column, and a support block installed on the top of the jack. The fixed seat is rectangular and has two ears extending from the top. The column is hinged with the two ears near the bottom. The jack is installed on the top of the column. The top of the column is provided with a mounting groove. The jack is installed in the mounting groove at the top of the column. The support block is fixed on the top of the jack, and the welding plate is placed on the support block.

[0016] Furthermore, the interior of the fixing seat is a hollow structure, an electric telescopic rod is installed in the hollow structure, the electric telescopic rod is transversely installed in the fixing seat, the bottom end of the electric telescopic rod is fixed to the side wall inside the fixing seat by bolts, one end of the telescopic rod of the electric telescopic rod is connected to one end of a hinged plate, and the other end of the hinged plate is hinged to the column near the bottom end;

[0017] A mounting edge extends from the bottom of the fixing seat, and a plurality of bolt holes are arranged on the mounting edge. The mounting edge is mounted in the mounting holes on the top of the moving plate by bolts.

[0018] Compared with the prior art, the reversible spot welding tool created by the present invention has the following advantages:

[0019] (1) The flip spot welding tool of the present invention can realize all spot welding at one time, avoid moving the workpiece and performing secondary (multiple) spot welding, improve the spot welding efficiency, and is suitable for spot welding of structural parts with higher cross-sections.

[0020] (2) The movable plate and the supporting assembly described in the present invention can be adjusted. The number of supporting assemblies can be increased according to the size of the welding plate actually being welded, or the distance between each group of supporting assemblies can be adjusted to support heavier welding plates and larger welding plates. Each adjustable part is automatically adjusted without manual adjustment, which is convenient, fast, and saves time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0022] Figure 1 A structural diagram of a reversible spot welding tooling according to an embodiment of the present invention;

[0023] Figure 2 A partial structural diagram of a reversible spot welding tooling according to an embodiment of the present invention;

[0024] Figure 3 The ground installation slot and the movable plate installation structure diagram described in the embodiment of the present invention are created;

[0025] Figure 4 A structural diagram of the ground installation slot according to an embodiment of the present invention;

[0026] Figure 5 The movable plate structure described in the embodiment of the present invention is created Figure 1 ;

[0027] Figure 6 The movable plate structure described in the embodiment of the present invention is created Figure 2 ;

[0028] Figure 7 A structural diagram of the folding assembly described in an embodiment of the present invention;

[0029] Figure 8 A front cross-sectional view of the movable plate according to an embodiment of the present invention;

[0030] Fig. 9 A side sectional view of a ground mounting slot according to an embodiment of the present invention;

[0031] Fig.10 A front cross-sectional view of a ground mounting slot according to an embodiment of the present invention;

[0032] Fig.11 This is a front view structural diagram of the base described in the embodiment of the present invention.

[0033] Description of reference numerals:

[0034] 1. Ground mounting groove; 2. Moving plate; 3. Folding assembly; 4. Welding plate; 5. Second gear; 6. Second drive motor; 7. Third drive motor; 11. T-shaped slide groove; 12. Bottom slide groove; 13. Moving plate mounting hole; 14. Rack; 15. First gear; 16. First drive motor; 21. T-shaped slider; 22. Mounting hole; 31. Fixed seat; 32. Column; 33. Jack; 34. Support block; 35. Hinge plate; 310. Double ears; 312. Electric telescopic rod; 313. Mounting edge; 61. Second gear mounting groove; 71. Third gear mounting groove; 72. Third gear. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying 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 a limitation on the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0037] In the description of the 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 invention can be understood according to specific circumstances.

[0038] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0039] like Figures 1 to 11 As shown, a reversible spot welding tool comprises a welding plate 4, a supporting assembly for supporting the welding plate 4, and a welding clamp for welding the welding plate 4;

[0040] The support assembly includes a ground mounting groove 1, a movable plate 2 mounted on the ground mounting groove 1, and a folding assembly 3 mounted on the movable plate 2;

[0041] The movable plate 2 is slidably connected to the ground mounting groove 1, the folding assembly 3 is fixed on the top of the movable plate 2, a support block 34 is provided on the top of the movable plate 2, the welding plate 4 is mounted on the support block 34, and the support assembly is flipped to allow the welding clamp to enter from one end and exit from the other end to reach the welding point position;

[0042] The welding tongs are C-type welding tongs.

[0043] like Figure 3 to Figure 4 As shown, the ground mounting groove 1 includes three T-shaped slide grooves 11 , a transmission component is installed in each of the T-shaped slide grooves 11 , a rack 14 is installed on the transmission component, and the rack 14 is located in the T-shaped slide groove 11 .

[0044] like Fig. 9 , Fig.10 As shown, the transmission assembly includes a first drive motor 16, two first gears 15, and two groups of chains. Two first gear mounting grooves are respectively provided at both ends of the ground mounting groove 1, and the two first gear mounting grooves are communicated with the T-shaped slide groove 11. The two first gears 15 are respectively installed in the two first gear mounting grooves, and a first drive motor mounting seat is provided between the two first gear mounting grooves. The first drive motor 16 is installed on the first drive motor mounting seat, and the rotating shaft of the first drive motor 16 is respectively connected to the two first gears 15, and the first gear 15 extends into the T-shaped slide groove 11. The two groups of chains are respectively meshed through the first gears 15 opposite to each other at both ends of the ground mounting groove 1, and the two groups of chains are respectively located in the T-shaped slide groove 11;

[0045] The rack 14 is segmented, and each segment of the rack 14 is correspondingly fixed on two adjacent chain links. A mounting block is provided at the bottom of each segment of the rack 14, and the mounting block is fixed on each chain link by welding.

[0046] like Figures 3 to 6 As shown, the top of the ground mounting groove 1 is provided with a plurality of movable plate mounting holes 13, and the plurality of movable plate mounting holes 13 are respectively communicated with the T-shaped slide groove 11, and the bottom of each movable plate 2 is provided with a T-shaped slider 21 corresponding to the T-shaped slide groove 11, and the size of the movable plate mounting hole 13 corresponds to the width of the bottom of the T-shaped slider 21, and the T-shaped slider 21 is installed in the T-shaped slide groove 11;

[0047] like Figure 5 , Figure 6 , Figure 8 Two T-shaped sliders 21 are respectively provided with second gear mounting grooves 61, and another T-shaped slider 21 is provided with a third gear mounting groove 71, the two second gear mounting grooves 61 are adjacent, the third gear mounting groove 71 is located at the edge of the ground mounting groove 1, a second gear 5 is installed in the second gear mounting groove 61, a second drive motor mounting seat is provided between the two second gear mounting grooves 61, a second drive motor mounting seat is provided, a second drive motor 6 is installed on the second drive motor mounting seat, the second drive motor 6 shaft is respectively connected to the second gears 5 on both sides of the second drive motor 6, a third gear 72 is installed in the third gear mounting groove 71, a third drive motor 7 mounting seat is provided between the third gear mounting groove 71 and the adjacent second gear mounting groove 61, a third drive motor 7 is installed on the third drive motor 7 mounting seat, the third drive motor 7 shaft is connected to the third gear 72, and the second gear 5 and the third gear 72 are respectively meshed with the rack 14;

[0048] The mobile seat is installed into the T-shaped slide groove 11 of the ground installation groove 1 through the mobile plate installation hole 22. Since the second gear 5 and the third gear 72 in the mobile plate 2 are meshed with the rack 14 on the chain, the first drive motor 16 is driven to drive the multiple first gears 15 to rotate, and the rotation of the multiple first gears 15 drives the chain to rotate, thereby completing the installation of the mobile seat. When the rack 14 does not rotate, the second drive motor 6 and the third drive motor 7 are started to drive the second gear 5 and the third gear 72 to rotate, so as to adjust the distance between each mobile plate 2;

[0049] The first drive motor 16 and the second drive motor 6 are double-headed motors, and the third drive motor 7 is a single-headed motor. Figure 3 and Figure 6 As shown, a plurality of mounting holes 22 are provided on the top of the movable plate 2, and the folding assembly 3 is mounted in the mounting holes 22 by bolts.

[0050] like Figure 7 As shown, the folding assembly 3 includes a fixing seat 31, a column 32 installed on the fixing seat 31, a jack 33 installed on the column 32, and a support block 34 installed on the top of the jack 33. The fixing seat 31 is rectangular, and two ears 310 extend from the top. The column 32 is hinged with the two ears 310 near the bottom. The jack 33 is installed on the top of the column 32. A mounting groove is provided on the top of the column 32. The jack 33 is installed in the mounting groove on the top of the column 32. The support block 34 is fixed on the top of the jack 33, and the welding plate 4 is placed on the support block 34.

[0051] The interior of the fixing seat 31 is a hollow structure, and an electric telescopic rod 312 is installed in the hollow structure. The electric telescopic rod 312 is horizontally installed in the fixing seat 31, and the bottom end of the electric telescopic rod 312 is fixed to the side wall inside the fixing seat 31 by bolts. One end of the telescopic rod of the electric telescopic rod 312 is connected to one end of a hinge plate 35, and the other end of the hinge plate 35 is hinged to the column 32 near the bottom end;

[0052] A mounting edge 313 extends from the bottom of the fixing seat 31, and a plurality of bolt holes are provided on the mounting edge 313. The mounting edge 313 is mounted in the mounting hole 22 at the top of the moving plate 2 by bolts.

[0053] The mounting edge 313 of the fixing seat 31 is provided with bolt holes, which correspond to the mounting holes 22. The fixing seat 31 is mounted on the moving plate 2 by bolts. The moving plate 2 is provided with multiple groups of mounting holes 22, and the installation of the support assembly can be increased according to actual needs.

[0054] An electric telescopic rod 312 is installed in the mobile seat, and one end of the telescopic rod of the electric telescopic rod 312 is hinged to the bottom of the column 32 through a hinge plate 35. The column 32 is located above the connection of the hinge plate 35 and is hinged to the double ears 310. When the telescopic rod is extended, the column 32 and the double ears 310 rotate, and the hinge plate 35 and the column 32 also rotate until the column 32 is parallel to the base. The length of the telescopic rod is just enough for the column 32 to flip over. The fixed seat 31 is located below the double ears 310 and is provided with a boss. After the column 32 is flipped over, it fits with the boss. The boss supports the fixed seat 31. The electric telescopic rod 312 realizes that the support component can be automatically flipped.

[0055] The specific structure is as follows:

[0056] When installing the moving plate 2, the moving plate 2 is installed into the T-shaped slide groove 11 of the ground installation groove 1 through the moving plate installation hole 22. Since the second gear 5 and the third gear 72 in the moving plate 2 are meshed with the rack 14 on the chain, the first driving motor 16 is driven to drive the multiple first gears 15 to rotate, and the multiple first gears 15 rotate to drive the chain to rotate, thereby completing the installation of the moving plate 2;

[0057] When the rack 14 does not rotate, the second drive motor 6 and the third drive motor 7 are started to drive the second gear 5 and the third gear 72 to rotate, so as to adjust the distance between each movable plate 2;

[0058] The first drive motor 16 is a double-headed motor, and the two rotating shafts of the two first drive motors 16 respectively drive the two first gears 15 to rotate. Two first drive motors 16 are respectively installed at both ends of the ground mounting slot 1, and the four first gears 15 are started at the same time, thereby realizing the rotation of the chain;

[0059] The second drive motor 6 and the third drive motor 7 are installed in the movable plate. Since there are three gear mounting grooves, the second drive motor 6 is a double-headed motor, and the two rotating shafts respectively control the two second gears 5. The third drive motor 7 is a single-headed motor, and the single-headed motor controls the third gear 72 to rotate to achieve the adjustment of the movable plate 2.

[0060] The mounting edge 313 of the fixing seat 31 is provided with bolt holes, which correspond to the mounting holes 22. The fixing seat 31 is mounted on the moving plate 2 by bolts. The moving plate 2 is provided with multiple groups of mounting holes 22, and the installation of the support assembly can be increased according to actual needs.

[0061] An electric telescopic rod 312 is installed in the mobile seat, and one end of the telescopic rod of the electric telescopic rod 312 is hinged to the bottom of the column 32 through a hinge plate 35. The column 32 is located above the connection of the hinge plate 35 and is hinged to the double ears 310. When the telescopic rod is extended, the column 32 rotates at the double ears 310, and the hinge plate 35 and the column 32 also rotate until the column 32 is parallel to the base. The length of the telescopic rod is just enough for the column 32 to flip over. The fixed seat 31 is provided with a boss below the double ears 310. The column 32 flips over and fits with the boss. The boss supports the fixed seat 31. The electric telescopic rod 312 realizes that the flip assembly can be automatically flipped.

[0062] The installation method of the first drive motor 16, the second drive motor 6, the third drive motor 7 and the first gear 15, the second gear 5 is a conventional installation method, which will not be described in detail here.

[0063] The welding clamp enters from one end of the workpiece and exits from the other end, which can avoid the limitation of the workpiece height on the spot welding of the welding clamp to a certain extent; when the welding clamp encounters interference with the tooling during its movement, the interfering tooling is flipped over to avoid the welding clamp. After the welding clamp completes the spot welding of the welding point at that position, the tooling is flipped back to support the workpiece, and so on, so as to achieve all spot welding at one time and improve the spot welding efficiency.

[0064] As shown, the first drive motor 16, the second drive motor 6, the third drive motor 7, and the electric telescopic rod 312 are all connected to the control device to achieve fully automatic adjustment.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A reversible spot welding tool, comprising a welding plate (4), a supporting assembly for supporting the welding plate (4), and a welding clamp for welding the welding plate (4), characterized in that: The support assembly comprises a ground installation groove (1), a movable plate (2) installed in the ground installation groove (1), and a folding assembly (3) installed on the movable plate (2); The movable plate (2) is slidably connected to the ground mounting groove (1), the folding assembly (3) is fixed on the top of the movable plate (2), a support block (34) is provided on the top of the movable plate (2), the welding plate (4) is mounted on the support block (34), and the support assembly is turned over to avoid the welding clamp, so that the welding clamp can move in from one end of the workpiece and out from the other end; The ground installation groove (1) comprises three T-shaped slide grooves (11), each of the T-shaped slide grooves (11) is equipped with a transmission component, a rack (14) is installed on the transmission component, and the rack (14) is located in the T-shaped slide groove (11); The transmission assembly comprises a first drive motor (16), two first gears (15), and two groups of chains. Two first gear mounting grooves are respectively provided at both ends of the ground mounting groove (1), and the two first gear mounting grooves are communicated with the T-shaped slide groove (11). The two first gears (15) are respectively installed in the two first gear mounting grooves. A first drive motor mounting seat is provided between the two first gear mounting grooves. The first drive motor (16) is installed on the first drive motor mounting seat. The rotating shaft of the first drive motor (16) is respectively connected to the two first gears (15). The first gears (15) extend into the T-shaped slide groove (11). The two groups of chains are respectively meshed through the first gears (15) opposite to each other at both ends of the ground mounting groove (1), and the two groups of chains are respectively located in the T-shaped slide groove (11); The folding assembly (3) comprises a fixing seat (31), a column (32) mounted on the fixing seat (31), a jack (33) mounted on the column (32), and a support block (34) mounted on the top of the jack (33); the fixing seat (31) is rectangular, with two ears (310) extending from the top; the column (32) is hinged with the two ears (310) near the bottom; the jack (33) is mounted on the top of the column (32); a mounting groove is provided on the top of the column (32); the jack (33) is mounted in the mounting groove on the top of the column (32); the support block (34) is fixed on the top of the jack (33); and the welding plate (4) is placed on the support block (34).

2. The reversible spot welding tool according to claim 1, characterized in that: The rack (14) is segmented, and each segment of the rack (14) is correspondingly fixed on two adjacent chain links.

3. The reversible spot welding tool according to claim 1, characterized in that: The top of the ground mounting groove (1) is provided with a plurality of movable plate mounting holes (13), and the plurality of movable plate mounting holes (13) are respectively communicated with the T-shaped slide groove (11); the bottom of each movable plate (2) is provided with a T-shaped sliding block (21) corresponding to the T-shaped slide groove (11); the size of the movable plate mounting hole (13) corresponds to the width of the bottom of the T-shaped sliding block (21); and the T-shaped sliding block (21) is installed in the T-shaped slide groove (11).

4. The reversible spot welding tool according to claim 3 is characterized in that: Two T-shaped slide blocks (21) are respectively provided with second gear mounting grooves (61), and another T-shaped slide block (21) is provided with a third gear mounting groove (71), the two second gear mounting grooves (61) are adjacent to each other, the third gear mounting groove (71) is located at the edge of the ground mounting groove (1), a second gear (5) is installed in the second gear mounting groove (61), a second drive motor mounting seat is provided between the two second gear mounting grooves (61), a second drive motor (6) is installed on the second drive motor mounting seat, and the second drive motor ( 6) rotating shafts are respectively connected to the second gears (5) on both sides of the second drive motor (6); a third gear (72) is installed in the third gear installation groove (71); a third drive motor (7) mounting seat is provided between the third gear installation groove (71) and the adjacent second gear installation groove (61); a third drive motor (7) is installed on the third drive motor (7) mounting seat; the third drive motor (7) rotating shaft is connected to the third gear (72); the second gear (5) and the third gear (72) are respectively meshed with the rack (14).

5. The reversible spot welding tool according to claim 1, characterized in that: The top of the movable plate (2) is provided with a plurality of mounting holes (22), and the folding assembly (3) is mounted in the mounting holes (22) by means of bolts.

6. A reversible spot welding tool according to claim 1 or 5, characterized in that: The interior of the fixing seat (31) is a hollow structure, and an electric telescopic rod (312) is installed in the hollow structure. The electric telescopic rod (312) is installed transversely in the fixing seat (31), and the bottom end of the electric telescopic rod (312) is fixed to the side wall inside the fixing seat (31) by bolts. One end of the telescopic rod of the electric telescopic rod (312) is connected to one end of a hinged plate (35), and the other end of the hinged plate (35) is hinged to the column (32) near the bottom end; A mounting edge (313) extends from the bottom of the fixing seat (31), and a plurality of bolt holes are provided on the mounting edge (313). The mounting edge (313) is mounted in the mounting hole (22) at the top of the moving plate (2) by means of bolts.

Images