Gear laser welding fixture

Abstract

The application discloses a gear laser welding clamp and relates to the technical field of manufacturing and automation, which comprises a base, the upper side of the base is provided with a docking device, a clamping device and a turnover device, after the gear is installed, the gear can be rotationally welded by rotating the rotating frame, cooperating with the placing frame, the clamping block, the rotating knob and the rotating rod, the rotationally welding utilizes the precise control and high energy density of the laser beam, can realize high-quality welding at the joint part of the gear, can reduce the heat-affected zone, reduce deformation and stress, thereby improving the strength and durability of the welded joint, if the rotation is stopped, the limiting block is clamped into the limiting groove, at this time, the rotating knob cannot be rotated, the rotating knob is prevented from being touched and rotated by external force, causing operation mistakes, the limiting block drives the contact block to move rightwards by cooperating with the contact block and the spiral groove, the radius size of the gear can be properly adjusted, so that the gear size can be adapted to the appropriate gear size.

Description

Technical Field

[0001] This invention relates to the fields of manufacturing and automation technology, specifically to a gear laser welding fixture. Background Technology

[0002] Gear laser welding fixtures are commonly used to achieve high-precision welding during gear manufacturing. These fixtures are designed to ensure the gear remains stable and aligned during laser welding, thereby improving welding quality and efficiency. They utilize a high-energy laser beam to locally heat the welding material and are suitable for welding high-precision and complex geometries.

[0003] Patent publication number CN202667942U relates to the fields of manufacturing and automation technology, including a power rotation mechanism, a welding platform, a gear ring clamping mechanism, a spoke clamping mechanism, and a gear ring tightening mechanism. The welding platform is fixedly connected to the power rotation mechanism. The gear ring clamping mechanism, mounted on the welding platform, axially clamps the gear ring. The spoke clamping mechanism, also mounted on the welding platform, axially clamps the spokes. The gear ring tightening mechanism, mounted on the welding platform, radially clamps the gear ring, ensuring its concentricity. The axial clamping mechanism ensures the end face accuracy of the gear ring and provides anti-splash protection. The spoke clamping mechanism, also mounted axially, prevents welding deformation and improves welding accuracy. The entire device effectively prevents welding deformation, protects the gears, and improves welding accuracy and efficiency.

[0004] In the aforementioned patent, the entire device can effectively prevent welding deformation, protect gears, and improve welding accuracy and efficiency. However, the current measuring equipment has the following problems: if the gear is difficult to rotate and weld, the molten pool during the welding process may not be evenly distributed, resulting in uneven welds, affecting strength and durability. Furthermore, if the rotating gear is not limited after rotation, external force may accidentally cause rotation, leading to welding operation errors. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a gear laser welding fixture, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a gear laser welding fixture, comprising a base, with a docking device, a clamping device, and a flipping device disposed above the base; wherein, the docking device comprises a fixed frame, an adjusting frame, a fixed block, a knob, a limiting rod, a limiting block, a rotating rod, an elastic telescopic rod, a placement frame, a rotating frame, a locking block, a bearing, a stop wheel, and a contact block; the fixed frame is fixedly mounted on the top of the base; the adjusting frame is rotatably mounted on the inner wall of the fixed frame; the fixed block is fixedly mounted on the top of the adjusting frame; the knob is rotatably mounted on the right side of the fixed block; a limiting groove is formed on the right side of the knob; the limiting rod is rotatably mounted on the right side of the knob; and the limiting block is slidably mounted on the circumferential surface of the limiting rod. One side of the rotating rod is fixedly installed on the left side of the knob, and the other side of the rotating rod rotates through the inner and outer walls of the fixed block. The fixed end of the elastic telescopic rod is fixedly installed on the top of the base. The placement frame is fixedly installed on the output end of the elastic telescopic rod. The rotating frame is rotatably installed on the inner wall of the placement frame. The locking block is rotatably installed on the surface of the placement frame. After the gear is installed, the gear can be rotated and welded by rotating the rotating frame in conjunction with the placement frame, the locking block, the knob, and the rotating rod. The surface of the rotating frame has a circular groove. The bearing is set between the placement frame and the rotating frame. The blocking wheel is rotatably installed on the inner wall of the bearing. The contact block is fixedly installed on the circumferential surface of the blocking wheel. If the rotation stops, the limiting block is locked into the limiting groove, and the knob cannot be rotated at this time.

[0007] According to the above technical solution, a spiral groove is provided on the circumferential surface of the rotating rod. The spiral groove is threadedly connected to the stop wheel. By rotating the stop wheel, the contact block is driven to rotate. The spiral groove causes the stop wheel to drive the contact block to move to the right.

[0008] According to the above technical solution, the clamping device includes a tripod, a sliding column, and a receiving plate. The tripod is fixedly installed on the circumferential surface of the rotating rod, the sliding column is slidably installed on the circumferential surface of the rotating rod, a No. 1 spring is provided between the sliding column and the rotating rod, and the receiving plate is fixedly installed on the circumferential surface of the sliding column. By moving the contact block to contact the sliding column, the sliding column moves to the right, causing the receiving plate to move.

[0009] According to the above technical solution, the clamping device further includes an L-shaped slider and a rotating rod. One side of the L-shaped slider is slidably mounted on the inner wall of the tripod, one side of the rotating rod is rotatably mounted on the surface of the L-shaped slider, and the other side of the rotating rod is rotatably mounted on the outer wall of the receiving plate. The movement of the receiving plate causes the rotating rod to rotate upward. The rotation of the rotating rod drives the L-shaped slider to move upward, and the tripod limits the movement distance of the L-shaped slider until it contacts the inner wall of the gear.

[0010] According to the above technical solution, the clamping device further includes a receiving block, a round rod, and a positioning groove. The receiving block is fixedly installed on the front side of the fixed frame, the round rod is fixedly installed through the inner and outer walls of the fixed frame, and the positioning groove is fixedly installed on the outer wall of the adjusting frame. The round rod is freed from the restriction so that the round rod can rotate freely.

[0011] According to the above technical solution, the flipping device includes a pressure plate, a connecting rod, a second spring, and a limiting post. The connecting rod slides through the inner and outer walls of the receiving block. The pressure plate is fixedly installed on the top of the connecting rod. The second spring is disposed between the receiving block and the pressure plate. One side of the limiting post is fixedly installed on the surface of the connecting rod, and the other side of the limiting post slides through the inner and outer walls of the round rod. By pressing the pressure plate, the connecting rod moves downward and the second spring is compressed, causing the limiting post to disengage from the round rod.

[0012] According to the above technical solution, the flipping device further includes a mounting frame and a hollow block. The mounting frame is fixedly installed on the top of the base, and the hollow block is fixedly installed on the top of the mounting frame to support the clamping device after flipping.

[0013] According to the above technical solution, the flipping device further includes an insert block, a sliding plate, a No. 3 spring, and a limiting plate. The insert block is slidably installed on the inner wall of the hollow block, and the sliding plate is slidably installed on the inner wall of the hollow block. The No. 3 spring is disposed between the insert block and the sliding plate. The limiting plate is fixedly installed on the rear side of the mounting frame. The top of the insert block is set as an inclined surface. A No. 4 spring is disposed between the sliding plate and the hollow block. If it is necessary to release the adjusted frame after rotation, the sliding plate is pulled outward to move it. The movement of the sliding plate will stretch the No. 3 spring. When the No. 3 spring is stretched to a certain extent, it will pull the insert block to move. At this time, the insert block is disengaged from the positioning groove, and the adjusted frame can be rotated freely. The quick fixing and disassembly can significantly reduce the time in the process of equipment installation and changing welding angles.

[0014] This invention provides a gear laser welding fixture. It has the following beneficial effects:

[0015] (1) In this invention, after the gear is installed by setting up the docking device, the gear can be rotated and welded by rotating the rotating frame in conjunction with the placement frame, the locking block, the knob and the rotating rod. The rotational welding utilizes the precise control and high energy density of the laser beam to achieve high-quality welding at the joint of the gear, which can reduce the heat-affected zone, reduce deformation and stress, thereby improving the strength and durability of the welded joint. If the rotation stops, the limiting block is locked into the limiting groove. At this time, the knob cannot be rotated to prevent external force from touching the knob and causing operational errors. At this time, the limiting block is rotated to drive the contact block to rotate. The spiral groove causes the limiting block to drive the contact block to move to the right, so as to make appropriate adjustments to the docking radius of the gear to adapt to the appropriate gear size.

[0016] (2) In this invention, after the gear is placed, the inner wall of the gear can be supported by the contact block, sliding column, receiving plate, rotating rod, L-shaped slider and triangular frame, so as to clamp the gear. The triangular support can effectively disperse the force applied to the gear and reduce stress concentration, thereby reducing the deformation or stress concentration problems that may occur during the processing. This can ensure the geometric accuracy and functional consistency of the gear. After the card block restricts the rotating frame, it is removed. The rotating frame drives the round rod to rotate and moves the positioning groove. At this time, the adjusting frame can be rotated 90° to the right, and the welding of the gear can be changed from the circumferential surface to the top of the gear. By welding at different angles, the size and shape of the gear can be controlled more precisely, thereby reducing the subsequent processing steps. This can reduce production costs and improve manufacturing efficiency.

[0017] (3) This invention, through the setting of the flipping device, uses the pressing plate in conjunction with the connecting rod, the second spring, the limiting post, the round rod, the positioning groove, the insert block, and the third spring to support the adjustment frame, preventing the adjustment frame from having nowhere to support it after rotation, which would lead to unstable position after rotation and thus cause operational errors during welding. If it is necessary to release the adjustment frame after rotation, the sliding plate is pulled outward to move it. The movement of the sliding plate will stretch the third spring. When the third spring is stretched to a certain extent, it will pull the insert block to move. At this time, the insert block is disengaged from the positioning groove, and the adjustment frame can be rotated freely. Through quick fixing and disassembly, the time for equipment installation and changing welding angles can be significantly reduced, the downtime is reduced, and the production efficiency is improved. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram showing the positional relationship between the card block and the rotating frame of the present invention;

[0020] Figure 3 This is a schematic diagram showing the positional relationship between the blocking wheel and the contact block of the present invention;

[0021] Figure 4 This is a schematic diagram showing the positional relationship between the rotating rod and the sliding column of the present invention;

[0022] Figure 5 This is a schematic diagram showing the positional relationship between the limiting block and the limiting rod of the present invention;

[0023] Figure 6 This is a schematic diagram showing the positional relationship between the receiving block and the round rod in this invention;

[0024] Figure 7 This is a schematic diagram of the internal structure of the hollow block of the present invention.

[0025] In the diagram: 1. Base; 10. Fixing frame; 11. Adjusting frame; 12. Fixing block; 13. Knob; 14. Limiting rod; 15. Limiting block; 16. Rotating rod; 17. Elastic telescopic rod; 18. Placement frame; 19. Rotating frame; 110. Locking block; 111. Bearing; 112. Abutting wheel; 113. Contact block; 20. Triangular frame; 21. Sliding column; 22. Support plate; 23. L-shaped slider; 24. Rotating rod; 25. Supporting block; 26. Round rod; 27. Positioning groove; 31. Pressure plate; 32. Connecting rod; 33. Spring No. 2; 34. Limiting column; 35. Mounting frame; 36. Hollow block; 37. Insert block; 38. Slide plate; 39. Spring No. 3. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0027] Please see Figures 1-5One embodiment of the present invention is: a gear laser welding fixture, including a base 1, with a docking device disposed above the base 1. The docking device includes a fixed frame 10, an adjusting frame 11, a fixed block 12, a knob 13, a limiting rod 14, a limiting block 15, a rotating rod 16, an elastic telescopic rod 17, a placement frame 18, a rotating frame 19, a locking block 110, a bearing 111, a stop wheel 112, and a contact block 113. The fixed frame 10 is fixedly installed on the top of the base 1, the adjusting frame 11 is rotatably installed on the inner wall of the fixed frame 10, the fixed block 12 is fixedly installed on the top of the adjusting frame 11, the knob 13 is rotatably installed on the right side of the fixed block 12, a limiting groove is formed on the right side of the knob 13, the limiting rod 14 is rotatably installed on the right side of the knob 13, and the limiting block 15 is slidably installed on the circumferential surface of the limiting rod 14 to prevent external force from touching the knob 13 and causing operational errors. One side of the rotating rod 16 is fixedly installed on the left side of the knob 13, and the other side of the rotating rod 16 rotates through the inner and outer walls of the fixing block 12. The fixed end of the elastic telescopic rod 17 is fixedly installed on the top of the base 1. The placement frame 18 is fixedly installed on the output end of the elastic telescopic rod 17. The rotating frame 19 is rotatably installed on the inner wall of the placement frame 18. The locking block 110 is rotatably installed on the surface of the placement frame 18. A circular groove is opened on the surface of the rotating frame 19. The bearing 111 is set between the placement frame 18 and the rotating frame 19. The stop wheel 112 is rotatably installed on the inner wall of the bearing 111. The contact block 113 is fixedly installed on the circumferential surface of the stop wheel 112. At this time, the gear can be rotated and welded. Rotation welding utilizes the precise control and high energy density of the laser beam to achieve high-quality welding at the joint of the gear. It can reduce the heat-affected zone, reduce deformation and stress, thereby improving the strength and durability of the welded joint.

[0028] The circumferential surface of the rotating rod 16 is provided with a spiral groove, which is threadedly connected to the stop wheel 112. The stop wheel 112 drives the contact block 113 to move to the right through the spiral groove.

[0029] In this embodiment, after the gear is installed, the rotating frame 19 is brought into contact with the placement frame 18 by rotation, and the rotating block 110 restricts the rotating frame 19. At this time, the rotating rod 16 is rotated by the knob 13, and the gear can be rotated for welding. Rotation welding utilizes the precise control and high energy density of the laser beam to achieve high-quality welding at the joint of the gear, which can reduce the heat-affected zone, reduce deformation and stress, thereby improving the strength and durability of the welded joint. If the rotation stops, the limiting block 15 is engaged in the limiting groove, and the knob 13 cannot be rotated at this time to prevent external force from touching the knob 13 and causing operational errors. At this time, the contact block 113 is rotated by rotating the abutment wheel 112, and the contact block 113 is moved to the right by the helical groove, so that the radius of the gear can be appropriately adjusted to adapt to the appropriate gear size.

[0030] Please see Figures 1-7 Based on the above embodiments, in another embodiment of the present invention, a clamping device and a flipping device are provided above the base 1. The clamping device includes a tripod 20, a sliding column 21 and a receiving plate 22. The tripod 20 is fixedly installed on the circumferential surface of the rotating rod 16, and the sliding column 21 is slidably installed on the circumferential surface of the rotating rod 16. A first spring is provided between the sliding column 21 and the rotating rod 16. The first spring drives the sliding column 21 to reset. The receiving plate 22 is fixedly installed on the circumferential surface of the sliding column 21, so that the sliding column 21 moves to the right and drives the receiving plate 22 to move. The movement of the receiving plate 22 causes the rotating rod 24 to rotate upward.

[0031] The clamping device also includes an L-shaped slider 23 and a rotating rod 24. One side of the L-shaped slider 23 is slidably mounted on the inner wall of the triangular frame 20, and one side of the rotating rod 24 is rotatably mounted on the surface of the L-shaped slider 23. The other side of the rotating rod 24 is rotatably mounted on the outer wall of the receiving plate 22 to clamp the gear. The triangular support can effectively disperse the force applied to the gear and reduce stress concentration, thereby reducing the deformation or stress concentration problems that may occur during the processing. This can ensure the geometric accuracy and functional consistency of the gear.

[0032] The clamping device also includes a receiving block 25, a round rod 26 and a positioning groove 27. The receiving block 25 is fixedly installed on the front side of the fixed frame 10. The round rod 26 is fixedly installed through the inner and outer walls of the fixed frame 10. The positioning groove 27 is fixedly installed on the outer wall of the adjusting frame 11. The round rod 26 is rotated by the rotation of the adjusting frame 11, which in turn drives the positioning groove 27 to move. At this time, the adjusting frame 11 can be rotated 90° to the right.

[0033] The flipping device includes a pressure plate 31, a connecting rod 32, a second spring 33, and a limiting post 34. The connecting rod 32 slides through the inner and outer walls of the receiving block 25. The pressure plate 31 is fixedly installed on the top of the connecting rod 32. The second spring 33 is located between the receiving block 25 and the pressure plate 31. The second spring 33 drives the pressure plate 31 to reset. One side of the limiting post 34 is fixedly installed on the surface of the connecting rod 32, and the other side of the limiting post 34 slides through the inner and outer walls of the round rod 26. By pressing the pressure plate 31, the connecting rod 32 moves downward and the second spring 33 is compressed, causing the limiting post 34 to disengage from the round rod 26.

[0034] The flipping device also includes a mounting bracket 35 and a hollow block 36. The mounting bracket 35 is fixedly mounted on the top of the base 1, and the hollow block 36 is fixedly mounted on the top of the mounting bracket 35, so that the flipping device can rotate.

[0035] The flipping device also includes an insert block 37, a slide plate 38, a third spring 39, and a limiting plate 310. The insert block 37 is slidably installed on the inner wall of the hollow block 36, and the slide plate 38 is slidably installed on the inner wall of the hollow block 36. The third spring 39 is set between the insert block 37 and the slide plate 38. The insert block 37 is reset by the third spring 39. The limiting plate 310 is fixedly installed on the rear side of the mounting frame 35. The limiting plate 310 supports the positioning groove 27, that is, supports the adjusting frame 11, to prevent the adjusting frame 11 from being unstable after rotation due to lack of support, which could lead to operational errors during welding. The top of the insert block 37 is set as an inclined surface. A fourth spring is set between the slide plate 38 and the hollow block 36. The slide plate 38 is reset by the fourth spring.

[0036] In this embodiment, after the gear is placed, the contact block 113 moves to contact the sliding column 21, causing the sliding column 21 to move to the right, which in turn moves the receiving plate 22. The movement of the receiving plate 22 causes the rotating rod 24 to rotate upward. The rotation of the rotating rod 24 causes the L-shaped slider 23 to move upward, and the movement distance of the L-shaped slider 23 is limited by the tripod 20 until it contacts the inner wall of the gear. At this time, the inner wall of the gear can be supported to clamp the gear. The triangular support can effectively disperse the force applied to the gear, reduce stress concentration, and thus reduce the deformation or stress concentration problems that may occur during processing. This can ensure the geometric accuracy and functional consistency of the gear. After the locking block 110 is released from the restriction of the rotating frame 19, it is removed. The adjustment frame 11 rotates, which drives the round rod 26 to rotate, and at the same time drives the positioning groove 27 to move. At this time, the adjustment frame 11 can be rotated 90° to the right, which can change the welding of the gear from the circumferential surface to the top of the gear. By welding at different angles, the size and shape of the gear can be controlled more precisely, thereby reducing subsequent processing steps. This can reduce production costs and improve manufacturing efficiency.

[0037] By pressing the pressure plate 31, the connecting rod 32 moves downward, simultaneously compressing the second spring 33, causing the limiting post 34 to disengage from the round rod 26. At this point, the round rod 26 is freed from its restraint and can rotate freely. The movement of the positioning groove 27 causes its outer wall to contact the inclined surface of the insertion block 37, moving the insertion block 37 forward and compressing the third spring 39. When the positioning groove 27 and the insertion block 37 are at the same level, the third spring 39 is released, causing the insertion block 37 to insert into the positioning groove 27. Simultaneously, the outer wall of the positioning groove 27 also contacts the limiting plate 310, which supports the positioning groove 27. The adjustment frame 11 is supported to prevent it from becoming unstable after rotation due to lack of support, which could lead to operational errors during welding. If the adjusted frame 11 needs to be released after rotation, it can be moved by pulling the slide plate 38 outward. The movement of the slide plate 38 will stretch the No. 3 spring 39. When the No. 3 spring 39 is stretched to a certain extent, it will pull the insert block 37 to move. At this time, the insert block 37 will disengage from the positioning groove 27, and the adjustment frame 11 can be rotated freely. The quick fixing and disassembly can significantly reduce the time spent on equipment installation and changing welding angles, reduce downtime, and improve production efficiency.

[0038] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gear laser welding fixture, comprising a base (1), characterized in that: A docking device, a clamping device and a flipping device are provided above the base (1); The docking device includes a fixed frame (10), an adjusting frame (11), a fixed block (12), a knob (13), a limiting rod (14), a limiting block (15), a rotating rod (16), an elastic telescopic rod (17), a placement frame (18), a rotating frame (19), a locking block (110), a bearing (111), a stop wheel (112), and a contact block (113). The fixed frame (10) is fixedly installed on the top of the base (1). The adjusting frame (11) is rotatably installed on the inner wall of the fixed frame (10). The fixed block (12) is fixedly installed on the top of the adjusting frame (11). The knob (13) is rotatably installed on the right side of the fixed block (12). A limiting groove is provided on the right side of the knob (13). The limiting rod (14) is rotatably installed on the right side of the knob (13). The limiting block (15) is slidably installed. The rotating rod (16) is fixedly installed on one side of the knob (13) on the circumferential surface of the limiting rod (14), and the other side of the rotating rod (16) rotates through the inner and outer walls of the fixing block (12). The fixed end of the elastic telescopic rod (17) is fixedly installed on the top of the base (1). The placement frame (18) is fixedly installed on the output end of the elastic telescopic rod (17). The rotating frame (19) is rotatably installed on the inner wall of the placement frame (18). The locking block (110) is rotatably installed on the surface of the placement frame (18). The surface of the rotating frame (19) is provided with a circular groove. The bearing (111) is set between the placement frame (18) and the rotating frame (19). The blocking wheel (112) is rotatably installed on the inner wall of the bearing (111). The contact block (113) is fixedly installed on the circumferential surface of the blocking wheel (112). The clamping device includes a tripod (20), a sliding column (21), and a receiving plate (22). The tripod (20) is fixedly installed on the circumferential surface of the rotating rod (16). The sliding column (21) is slidably installed on the circumferential surface of the rotating rod (16). A first-order spring is provided between the sliding column (21) and the rotating rod (16). The receiving plate (22) is fixedly installed on the circumferential surface of the sliding column (21). The clamping device also includes a receiving block (25), a round rod (26) and a positioning groove (27). The receiving block (25) is fixedly installed on the front side of the fixing frame (10), the round rod (26) is fixedly inserted through the inner and outer walls of the fixing frame (10), and the positioning groove (27) is fixedly installed on the outer wall of the adjusting frame (11). The flipping device includes a pressure plate (31), a connecting rod (32), a second spring (33), and a limiting post (34). The connecting rod (32) slides through the inner and outer walls of the receiving block (25). The pressure plate (31) is fixedly installed on the top of the connecting rod (32). The second spring (33) is set between the receiving block (25) and the pressure plate (31). One side of the limiting post (34) is fixedly installed on the surface of the connecting rod (32), and the other side of the limiting post (34) slides through the inner and outer walls of the round rod (26). The flipping device also includes a mounting bracket (35) and a hollow block (36), the mounting bracket (35) being fixedly mounted on the top of the base (1), and the hollow block (36) being fixedly mounted on the top of the mounting bracket (35); The flipping device also includes a plug (37), a slide plate (38), a third spring (39), and a limiting plate (310). The plug (37) is slidably installed on the inner wall of the hollow block (36), the slide plate (38) is slidably installed on the inner wall of the hollow block (36), the third spring (39) is disposed between the plug (37) and the slide plate (38), the limiting plate (310) is fixedly installed on the rear side of the mounting frame (35), the top of the plug (37) is set as an inclined surface, and a fourth spring is disposed between the slide plate (38) and the hollow block (36). The circumferential surface of the rotating rod (16) is provided with a spiral groove, and the spiral groove is threadedly connected to the stop wheel (112); The clamping device also includes an L-shaped slider (23) and a rotating rod (24). One side of the L-shaped slider (23) is slidably mounted on the inner wall of the tripod (20), one side of the rotating rod (24) is rotatably mounted on the surface of the L-shaped slider (23), and the other side of the rotating rod (24) is rotatably mounted on the outer wall of the receiving plate (22).

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