Surface treatment device for rivets

Abstract

The surface treatment device for the rivets comprises an electroplating box, a barrel plating mechanism is rotationally arranged in the electroplating box, the barrel plating mechanism comprises a barrel plating barrel, and layering assemblies distributed circumferentially are arranged in the barrel plating barrel in an array mode. All to-be-electroplated rivets can be evenly distributed among different layers through the layering assemblies, the rivets in all the layering assemblies roll in the current space, the collision phenomenon between the upper layer and the lower layer does not exist, and therefore the electroplating quality is improved, the layering assemblies can further evenly distribute parts in the direction of all the side walls of the barrel plating barrel, and the electroplating quality is improved. And the feeding quantity of single electroplating is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of electroplating, and in particular relates to a surface treatment device for rivets. Background Art

[0002] The electroplating of rivet fasteners is different from that of conventional machined parts. Due to their large production capacity, small workpiece size, and no special fixed structure, they cannot be plated using processes such as rack plating or brush plating.

[0003] Rivets and other fasteners are often electroplated using the barrel plating process. Barrel plating can concentrate scattered small parts in the barrel for centralized electroplating, which improves the efficiency of electroplating. When the small parts are constantly rolling in the barrel, it can ensure that each part can contact the electroplating solution.

[0004] However, due to the limitations of the current structure of the barrel plating tooling, the quality of barrel plating still has certain defects. During barrel plating, the parts are constantly rolling in the drum, and the frequent friction and collision between parts at different levels will cause surface defects of the electroplating. Moreover, the parts cannot control their flipping cycle during rolling. The time for each part to flip from the inner layer to the surface layer and then from the surface layer to the inner layer cannot be accurately controlled, and the phenomenon of parts stacking cannot be avoided.

[0005] The above problems will lead to uneven electroplating thickness of parts, scratches on the electroplating surface and other quality defects. Summary of the invention

[0006] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a surface treatment device for rivets, which at least partially solves the above problems.

[0007] The technical solution adopted by the present invention is as follows: A surface treatment device for rivets proposed by the present invention comprises an electroplating box, wherein an electroplating solution is contained in the electroplating box for electroplating the surface of parts; Furthermore, a roller plating mechanism is rotatably provided in the electroplating box, and the rivet parts to be electroplated are filled inside the roller plating mechanism. The roller plating mechanism reciprocates to make the rivets fully contact and react with the electroplating solution, thereby completing the electroplating operation.

[0008] Furthermore, the roller plating mechanism includes a roller plating cylinder, and pressure covers are symmetrically provided at both ends of the roller plating cylinder, and the pressure covers are used to seal the roller plating cylinder to prevent parts such as rivets inside the roller plating cylinder from slipping out.

[0009] Furthermore, in order to drive the roller plating mechanism to rotate, a driven wheel is fixed on the pressure cover, a sliding shaft runs through the middle of the electroplating box, and the center rotation of the roller plating cylinder is arranged on the sliding shaft; Furthermore, a power shaft is detachably fixed to the electroplating box through a flange block, a motor is fixed to one end of the power shaft, the output shaft of the motor is connected to the power shaft through a coupling, and an intermittent wheel is symmetrically fixed to the power shaft, the intermittent wheel has teeth distributed at intervals, the intermittent wheel can mesh with the driven wheel, and the intermittent wheel drives the driven wheel to rotate at a fixed frequency, and whenever the intermittent wheel meshes with the driven wheel, the driven wheel will rotate and drive the roller plating cylinder to rotate.

[0010] Furthermore, in order to promote the vibration of the rivet parts in the barrel plating tube and promote the parts to be evenly distributed, a feeler rod is provided above the gland, and the feeler rods on the glands at both ends are symmetrically arranged relative to the axis center of the sliding shaft; Furthermore, the inner side wall of the electroplating box is symmetrically provided with inclined guide plates, the height and angle of which are adapted to the diameter of the roller plating cylinder and the size of the touch rod, when the touch rod at one end contacts the top end of the inclined guide plate, the touch rod at the other end contacts the bottom end of the inclined guide plate on the other side, and when the roller plating cylinder rotates around the sliding shaft, the roller plating cylinder will reciprocate left and right under the action of the touch rod and the inclined guide plate; Furthermore, in order to cope with the horizontal reciprocating movement of the roller plating cylinder, the width of the intermittent wheel should be greater than the width of the driven wheel.

[0011] Furthermore, the inner array of the barrel plating cylinder is provided with circumferentially distributed layered components, the number of the layered components is adapted to the number of edges of the barrel plating cylinder, the circumferentially distributed layered components form a closed regular polygon, one end of the layered component is slidably disposed on the inner side wall of the barrel plating cylinder, and the end of the layered component away from the inner side wall of the barrel plating cylinder slides on the adjacent layered component; Furthermore, the layered components are positioned and connected to the side wall of the roller plating cylinder via positioning pins. By adjusting the position of the positioning pins, the distance between the outermost layered components and the roller plating cylinder and the distance between adjacent layered components can be adjusted. This width distance is adapted to the size of the rivet parts to be electroplated.

[0012] Furthermore, the layered component includes an inner lining plate and a sealing plate, one end of the inner lining plate is slidably disposed on the inner wall of the roller plating cylinder, the angle between the inner lining plate and the inner wall of the roller plating cylinder is the same as the dihedral angle (the angle between two adjacent planes) of the roller plating cylinder, the sealing plate is slidably disposed in the inner lining plate by a spring, and the spring always pushes the sealing plate away from the inner lining plate, the outermost sealing plate is slidably disposed on the inner wall of the roller plating cylinder at one end away from the spring, the inner sealing plate is slidably disposed on the side wall of the inner lining plate adjacent to its outer side at one end away from the spring, and the end of the adjacent inner lining plate is slidably disposed on the side wall of the sealing plate.

[0013] Furthermore, the side wall array of the blocking plate is provided with a liquid guide groove, and the blocking plate is penetrated by a leakage hole 1 in an array, so that the plating liquid can enter the inside of the blocking plate from the liquid guide groove and then flow out from the leakage hole 1, so that the plating liquid is filled between the layered components; Further, the inner lining plate comprises a plate body 1, a sliding groove is arranged in the plate body 1, and a plug-in frame is symmetrically arranged on one side of the plate body 1, and the distance between the plug-in frames on both sides is adapted to the width of the plate body 1, so that the adjacent inner lining plates in the same layered assembly can be slidably installed, so that the plate body 1 of the inner lining plate is slidably arranged between the plug-in frames of the adjacent inner lining plates; Furthermore, the blocking plate is slidably arranged in the sliding groove, and there is a gap between the blocking plate and the inserting frame, and the gap is smaller than the size of the part to be electroplated, and the part cannot flow out of the gap; Furthermore, the plate body 1 is provided with a second leakage hole array, and the electroplating liquid can enter the sliding groove from the second leakage hole, and then enter the first leakage hole through the liquid guide groove, so that the electroplating liquid is evenly distributed in the gaps between the layered components; Furthermore, a positioning groove is provided at the end of the inserting rack, and the positioning pin is arranged in the positioning groove, so as to facilitate the adjustment of the gap between the layered components and fix it on the roller plating cylinder.

[0014] The beneficial effects achieved by the present invention are as follows: 1. The layered components can evenly distribute all the rivets to be electroplated between different layers. All the rivets in the layered components roll in the current space, and there is no collision between the upper and lower layers, which improves the electroplating quality; 2. The layered components can evenly distribute the parts on each side wall of the barrel, increasing the number of single electroplating loads; 3. The intermittent wheel can make the roller plating cylinder vibrate and rotate intermittently, and the inclined guide plate can make the roller plating cylinder vibrate back and forth, thereby promoting the tumbling and vibration of the rivets, so that all surfaces of the rivets are fully in contact with the electroplating solution, further improving the quality and uniformity of electroplating. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment of the present invention; Figure 2 for Figure 1 A cross-sectional view of Figure 3 It is a structural schematic diagram of a barrel plating mechanism; Figure 4 Schematic diagram of the internal structure of the barrel Figure 1 ; Figure 5 Schematic diagram of the internal structure of the barrel Figure 2 ; Figure 6 A state diagram of a single layered component in a barrel; Figure 7 It is a schematic diagram of the structure of layered components; Figure 8 This is a positional relationship diagram of the inner lining plate and the sealing plate; Fig. 9 This is a fracture view of the blocking plate; Fig.10 This is a fracture view of the lining plate.

[0016] Among them, 1. electroplating box, 2. roller plating mechanism, 3. motor, 4. power shaft, 5. intermittent wheel, 6. sliding shaft, 7. flange pressure block, 8. inclined guide plate, 9. touch rod, 10. roller plating cylinder, 11. pressure cover, 12. driven wheel, 13. layered component, 14. positioning pin, 15. lining plate, 16. sealing plate, 17. spring, 18. liquid guide groove, 19. leakage hole one, 20. plate body one, 21. bracket, 22. positioning groove, 23. sliding groove, 24. leakage hole two.

[0017] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it should be understood that terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “top”, “bottom”, “inside” and “outside” indicating directions or positional relationships are based on the directions 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0020] like Figure 1 and Figure 2 As shown, a surface treatment device for rivets proposed by the present invention comprises an electroplating box 1, wherein the electroplating box 1 contains an electroplating solution for electroplating the surface of a part; A roller plating mechanism 2 is rotatably provided in the electroplating box 1. The interior of the roller plating mechanism 2 is filled with rivet parts to be electroplated. The roller plating mechanism 2 reciprocates to make the rivets fully contact and react with the electroplating solution, thereby completing the electroplating operation.

[0021] like Figure 3As shown, the barrel plating mechanism 2 includes a barrel plating cylinder 10, and pressure covers 11 are symmetrically provided at both ends of the barrel plating cylinder 10. The pressure covers 11 are used to seal the barrel plating cylinder 10 to prevent parts such as rivets inside it from slipping out.

[0022] Combination Figure 2 As shown, in order to drive the barrel plating mechanism 2 to rotate, a driven wheel 12 is fixed on the pressure cover 11, a sliding shaft 6 runs through the middle of the electroplating box 1, and the center of the barrel plating cylinder 10 is rotatably arranged on the sliding shaft 6; A power shaft 4 is detachably fixed to the electroplating box 1 through a flange pressing block 7, and a motor 3 is fixed to one end of the power shaft 4. The output shaft of the motor 3 is connected to the power shaft 4 through a coupling, and an intermittent wheel 5 is symmetrically fixed to the power shaft 4. The intermittent wheel 5 has teeth distributed at intervals, and the intermittent wheel 5 can mesh with the driven wheel 12. The intermittent wheel 5 drives the driven wheel 12 to rotate at a fixed frequency. Whenever the intermittent wheel 5 meshes with the driven wheel 12, the driven wheel 12 will rotate and drive the roller plating cylinder 10 to rotate. After the roller plating cylinder 10 is subjected to intermittent external force, energy is transmitted and vibration is generated. Each drive will cause vibration, which will not only make the parts roll, but also make the parts evenly distributed to prevent overlapping, thereby making the rivets inside the roller plating cylinder 10 flip to different angles, thereby improving the quality and uniformity of electroplating.

[0023] In order to promote the vibration of the rivet parts in the barrel plating cylinder 10 and promote the parts to be evenly distributed, a feeler rod 9 is provided above the gland 11, and the feeler rods 9 on the glands 11 at both ends are symmetrically arranged relative to the axis center of the sliding shaft 6; The inner wall of the electroplating box 1 is symmetrically provided with inclined guide plates 8, the height and angle of the inclined guide plates 8 are adapted to the diameter of the barrel plating cylinder 10 and the size of the feeler rod 9, when the feeler rod 9 at one end contacts the top end of the inclined guide plate 8, the feeler rod 9 at the other end contacts the bottom end of the inclined guide plate 8 on the other side, when the barrel plating cylinder 10 rotates around the sliding shaft 6, the barrel plating cylinder 10 will reciprocate left and right under the action of the feeler rod 9 and the inclined guide plate 8, thereby vibrating the material inside the barrel plating cylinder 10 in the horizontal direction to make its distribution more uniform; In order to cope with the horizontal reciprocating movement of the roller plating cylinder 10, the width of the intermittent wheel 5 should be greater than the width of the driven wheel 12, so that the driven wheel 12 on the roller plating cylinder 10 is not affected by the change of the horizontal position and is always engaged with the intermittent wheel 5.

[0024] like Figure 4 and Figure 5 As shown, the inner array of the barrel plating cylinder 10 is provided with circumferentially distributed layered components 13, the number of the layered components 13 is adapted to the number of edges of the barrel plating cylinder 10, and the circumferentially distributed layered components 13 form a closed regular polygon, one end of the layered component 13 is slidably disposed on the inner side wall of the barrel plating cylinder 10, and the end of the layered component 13 away from the inner side wall of the barrel plating cylinder 10 slides on the adjacent layered component 13; The layered components 13 are positioned and connected to the side wall of the roller plating cylinder 10 by means of the positioning pins 14. By adjusting the position of the positioning pins 14, the distance between the outermost layered components 13 and the roller plating cylinder 10 and the distance between adjacent layered components 13 can be adjusted. This width distance is adapted to the size of the rivet parts to be electroplated. When the rivet is filled into this gap, the rivet can roll slightly within this width range but will not produce large fluctuations and vibrations, so that the rivet can roll slightly to adjust the electroplating angle without vibrating greatly to cause scratches and collisions. In addition, the rivets between layered components 13 at different levels will not contact each other, and there will be no up and down collision.

[0025] like Figure 6-Figure 8 As shown, the layered assembly 13 includes an inner lining plate 15 and a blocking plate 16. One end of the inner lining plate 15 is slidably disposed on the inner side wall of the barrel plating cylinder 10. The angle between the inner lining plate 15 and the inner side wall of the barrel plating cylinder 10 is the same as the dihedral angle (the angle between two adjacent planes) of the barrel plating cylinder 10. The blocking plate 16 is slidably disposed in the inner lining plate 15 through a spring 17. The spring 17 always pushes the blocking plate 16 away from the inner lining plate 15. The end of the outermost blocking plate 16 away from the spring 17 is slidably disposed on the barrel plating cylinder 10. 0, the inner sealing plate 16 is slidably disposed on the side wall of the adjacent inner lining plate 15 on its outer side, and the end of the adjacent inner lining plate 15 is slidably disposed on the side wall of the sealing plate 16. When any one of the inner lining plates 15 slides along the inner wall of the roller plating cylinder 10, the remaining inner lining plates 15 and the sealing plate 16 in the current layered assembly 13 move synchronously, thereby changing the gap between adjacent layered assemblies 13, which is convenient for adjusting the gap size of the layered assembly 13 according to the size of the electroplated parts.

[0026] like Figure 9-10 As shown, the side wall array of the blocking plate 16 is provided with a liquid guide groove 18, and the upper array of the blocking plate 16 is penetrated with a leakage hole 19, so that the plating liquid can enter the inside of the blocking plate 16 from the liquid guide groove 18 and then flow out from the leakage hole 19, so that the plating liquid is filled between the layered components 13; The inner lining plate 15 includes a plate body 20, a sliding groove 23 is provided in the plate body 20, and a plug-in frame 21 is symmetrically provided on one side of the plate body 20, and the distance between the plug-in frames 21 on both sides is adapted to the width of the plate body 20, so that the adjacent inner lining plates 15 in the same layered component 13 can be slidably installed, so that the plate body 20 of the inner lining plate 15 is slidably arranged between the plug-in frames 21 of the adjacent inner lining plates 15; The blocking plate 16 is slidably disposed in the sliding groove 23. There is a gap between the blocking plate 16 and the inserting frame 21. The gap is smaller than the size of the parts to be electroplated, and the parts cannot flow out of the gap. The plate body 1 20 is provided with a second leakage hole 24 in an array, and the electroplating liquid can enter the sliding groove 23 from the second leakage hole 24, and then enter the first leakage hole 19 through the liquid guide groove 18, so that the electroplating liquid is evenly distributed in the gaps between the layered components 13; A positioning groove 22 is provided at the end of the inserting frame 21 , and a positioning pin 14 is provided in the positioning groove 22 , so as to facilitate adjustment of the gap between the layered components 13 and fix them on the roller plating cylinder 10 .

[0027] During the specific operation, the pressure covers 11 at both ends of the roller plating cylinder 10 are opened, and the gaps between the layered components 13 and the inner wall of the roller plating cylinder 10, as well as the gaps between adjacent layered components 13, are adjusted through the positioning pins 14 to make the gap distance match the maximum outer diameter of the rivets to be electroplated. The rivets can only roll slightly in this space and cannot produce large jumps, thereby reducing the damage caused by the up and down impact of the rivets.

[0028] When adjusting the gap, the position of the blocking plate 16 in different layers relative to the inner lining plate 15 will change, but the blocking plate 16 is always in contact with the side wall of the roller plating cylinder 10 or the inner lining plate 15 under the action of the spring 17, so that the different layered components 13 are completely isolated to prevent the material from flowing between the layered components 13 when the material is added later.

[0029] After the adjustment is completed, the rivets to be electroplated are filled into the gaps of each layered component 13 to fill them up. At this time, the gap height is adapted to the outer diameter of the material, and there will be no stacking phenomenon, which will reduce the collision of the material during subsequent rotation. Then, the pressure cover 11 is re-fixed on both ends of the roller plating cylinder 10, and the driven wheel 12 is fixed.

[0030] Then hoist the roller plating cylinder 10 into the electroplating box 1, pass the sliding shaft 6 through the center of the roller plating cylinder 10, fix the height of the roller plating cylinder 10, and then contact the inclined guide plate 8, and then fix the flange block 7 and the power shaft 4 at the upper end of the electroplating box 1. At this time, the intermittent wheel 5 is engaged and fixed with the driven wheel 12.

[0031] Start the motor 3, which drives the driven wheel 12 to rotate through the intermittent wheel 5. The rotation of the driven wheel 12 will drive the roller plating cylinder 10 to rotate through the pressure cover 11. When the roller plating cylinder 10 rotates, the materials in each layered component 13 rotate along with it, and tumble during the rotation, so that the materials are fully in contact with the electroplating solution.

[0032] At the same time, during the rotation of the intermittent wheel 5, the roller plating cylinder 10 will only rotate when the intermittent wheel 5 is in contact with the driven wheel 12. After the roller plating cylinder 10 is subjected to intermittent external force, energy is transmitted and vibration is generated. Each drive will cause vibration, which will not only make the parts roll, but also make the parts evenly distributed, thereby flipping the rivets inside the roller plating cylinder 10 to different angles, further improving the quality and uniformity of electroplating.

[0033] When the roller plating cylinder 10 rotates, the feeler rod 9 is always in contact with the inclined guide plate 8. Under the push of the inclined guide plate 8, the roller plating cylinder 10 also synchronously reciprocates in the horizontal direction, thereby generating vibration in the horizontal direction.

[0034] The material vibrates synchronously in the horizontal and rotational directions, which can promote the contact between each surface of the material and the electroplating solution and improve the uniformity of the electroplating layer.

[0035] When the electroplating is completed, the flange pressing block 7 is removed, the power shaft 4, the intermittent wheel 5 and the sliding shaft 6 are taken out, and the barrel 10 is lifted out, the pressure cover 11 is removed, and the material is poured out from the layered assembly 13.

[0036] It should be noted that, in this article, relational terms such as first and second, 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.

[0037] While the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that many changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the invention.

[0038] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A surface treatment device for rivets, characterized in that: include: An electroplating box (1) for containing an electroplating solution; A roller plating cylinder (10) is arranged in an electroplating box (1), wherein a circumferentially distributed layered component (13) is arranged in an array in the roller plating cylinder (10), wherein the layered component (13) comprises an inner lining plate (15) and a blocking plate (16), wherein one end of the inner lining plate (15) is slidably arranged on the inner side wall of the roller plating cylinder (10), wherein the angle between the inner lining plate (15) and the inner side wall of the roller plating cylinder (10) is the same as the dihedral angle of the roller plating cylinder (10), and wherein the inner lining plate (15) is provided at a position equal to the inner side wall of the roller plating cylinder (10). The blocking plate (16) is slidably arranged in the inner lining plate (15) via a spring (17); the end of the outermost blocking plate (16) away from the spring (17) is slidably arranged on the inner wall of the roller plating cylinder (10); the end of the inner blocking plate (16) away from the spring (17) is slidably arranged on the side wall of the adjacent inner lining plate (15) on its outer side; and the end of the adjacent inner lining plate (15) is slidably arranged on the side wall of the blocking plate (16).

2. The surface treatment device for rivets according to claim 1, characterized in that: The side wall array of the blocking plate (16) is provided with a liquid guide groove (18), and the upper array of the blocking plate (16) is penetrated by a leakage hole one (19).

3. The surface treatment device for rivets according to claim 2, characterized in that: The inner lining plate (15) comprises a plate body (20), a sliding groove (23) is provided in the plate body (20), a plug-in frame (21) is symmetrically provided on one side of the plate body (20), the distance between the plug-in frames (21) on both sides is adapted to the width dimension of the plate body (20), and the plate body (20) of the inner lining plate (15) is slidably arranged between the plug-in frames (21) of adjacent inner lining plates (15).

4. The surface treatment device for rivets according to claim 3, characterized in that: The blocking plate (16) is slidably disposed in the sliding groove (23).

5. The surface treatment device for rivets according to claim 3, characterized in that: The plate body (20) is provided with leakage holes (24) in an array, and the end of the inserting frame (21) is provided with a positioning groove (22).

6. The surface treatment device for rivets according to claim 5, characterized in that: The layered assembly (13) is connected to the side wall of the roller plating cylinder (10) in a positioning manner via a positioning pin (14), and the positioning pin (14) is disposed in a positioning groove (22).

7. The rivet surface treatment device according to claim 1, characterized in that: Pressure covers (11) are symmetrically provided at both ends of the roller plating cylinder (10), and a driven wheel (12) is fixed on the pressure cover (11).

8. The rivet surface treatment device according to claim 6, characterized in that: A sliding shaft (6) passes through the middle of the electroplating box (1), and the center of the roller plating cylinder (10) is rotatably arranged on the sliding shaft (6).

9. The surface treatment device for rivets according to claim 7, characterized in that: A power shaft (4) is detachably fixed to the electroplating box (1) via a flange pressing block (7), a motor (3) is fixed to one end of the power shaft (4), an intermittent wheel (5) is symmetrically fixed to the power shaft (4), the intermittent wheel (5) has teeth arranged at intervals, the intermittent wheel (5) is meshable with the driven wheel (12), and the width of the intermittent wheel (5) is greater than the width of the driven wheel (12).

10. The rivet surface treatment device according to claim 7, characterized in that: A touch rod (9) is provided above the pressure cover (11), and the touch rods (9) on the pressure covers (11) at both ends are symmetrically arranged relative to the axis center of the sliding shaft (6). The inner side wall of the electroplating box (1) is symmetrically provided with inclined guide plates (8), and the height and angle of the inclined guide plates (8) are adapted to the diameter of the roller plating cylinder (10) and the size of the touch rod (9).

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