Molding device for intelligent manufacturing of ice maker

Abstract

The invention discloses a forming device for intelligent manufacturing of an ice maker, and belongs to the field of production and processing of the ice maker, the forming device comprises a base and an ice making tray, the surface of the base is provided with a positioning groove and an action rack, an abutting assembly and a lead screw translation mechanism are arranged above the base, and a welding assembly is arranged in the lead screw translation mechanism; the welding assembly comprises a moving frame, a welding and conveying assembly and a positioning and filling assembly. By arranging the filling bin and the abutting assembly, orderly storage and stable abutting of the stacked barrier plates are achieved, and a guarantee is provided for subsequent separation of the single barrier plates and pushing of the single barrier plates into the clamping blocks through the pushing block; separation, pushing positioning and primary welding or double-face welding of a single barrier plate are synchronously completed in one-time lifting action, a positioning roller can accurately rotate in the linear motion process by arranging a positioning filling assembly, and a clamping block set is driven to be switched between a filling position and a welding position.

Description

Technical Field

[0001] The present invention relates to the technical field of ice making machine production and processing, and in particular to a forming device for intelligent manufacturing of ice making machines. Background Art

[0002] An ice maker is an electrical device designed specifically for automatically producing ice cubes. It can provide ice cubes quickly, continuously, and in large quantities. The ice tray is a grid-like structure formed by welding an aluminum alloy bottom plate, longitudinal beams, and grid plates. It is one of the core components of the ice maker.

[0003] Existing automated welding equipment cannot accurately fill the grid panels. Workers need to manually insert and position each panel into the longitudinal beam gap, which is inefficient and prone to welding defects due to positioning deviations. Robots are then used to perform point-by-point positioning and welding. However, because existing six-axis robots are prone to inter-axis collisions in dense grids, the welding gun must be frequently adjusted to avoid adjacent longitudinal beams, making motion trajectory planning highly complex.

[0004] At the same time, the filling, positioning and welding of the grille plates need to be carried out in steps, resulting in poor equipment coordination and low production efficiency, which also affects the welding quality. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem in the prior art that it is difficult to achieve grid plate welding through automated equipment during the production and processing of ice making machines, and to propose a forming device for intelligent manufacturing of ice making machines.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A forming device for intelligent manufacturing of ice making machines, comprising a base and an ice making tray composed of a bottom plate, a longitudinal beam, and a grille plate; a surface of the base is provided with a positioning groove and an action rack; a tightening assembly and a screw translation mechanism are provided above the base; a welding assembly is provided within the screw translation mechanism; the welding assembly comprises a moving frame; a semi-open loading bin is provided at the top of the moving frame; a mounting cavity is provided on the side wall of the moving frame; a welding and feeding assembly is provided within the mounting cavity; and a positioning and filling assembly is provided at the bottom of the moving frame;

[0008] The welding delivery assembly includes a plurality of welding gun bodies, and a lifting action rod is provided on a side of the welding gun body away from the movable frame;

[0009] The positioning and filling assembly includes a positioning roller, the outer wall of which is provided with a plurality of clamping blocks that match the gap between the longitudinal beams and an action gear that matches the action rack, and the interior of the positioning roller is provided with a plurality of clamping action rods that match the clamping blocks. One end of the positioning roller is rotatably connected to the mobile frame, and the other end of the positioning roller passes through the mobile frame. A driving unit is provided at one end of the positioning roller that passes through the mobile frame.

[0010] Preferably, a compartment matching the longitudinal beam gap is provided in the loading bin, stacked grid plates are placed in the compartment, and loading grooves matching the pushing blocks are provided on the upper and lower surfaces of the loading bin away from the opening end.

[0011] Preferably, the clamping assembly includes a bracket fixedly mounted on the surface of the base, a plurality of pneumatic clamping rods matching the longitudinal beam gaps are fixedly mounted in the bracket, and one end of the pneumatic clamping rod close to the loading bin is fixedly connected with a clamping plate for clamping the stacked grille plates.

[0012] Preferably, the welding gun body is slidably connected to the mounting cavity, a tooth groove is provided on the side of the welding gun body away from the loading bin, a plasma integrated welding head is fixedly installed on the bottom of the welding gun body, and a pushing block matching the grid plate is fixedly connected to the top of the welding gun body.

[0013] Preferably, the outer wall of the lifting action rod is fixedly connected with a plurality of lifting gears with matching teeth, the lifting gears are meshed with the teeth, the end of the lifting action rod is rotatably connected with the side wall of the installation cavity, and the end of the lifting action rod extends outward through the side wall of the installation cavity and is fixedly connected with a lifting motor.

[0014] Preferably, the clamping blocks are arranged in groups of two around the central axis of the positioning roller, and the ends of the clamping blocks are rotatably connected to the positioning roller. The ends of the clamping blocks are arranged in a gear shape and meshed with each other, so that clamping and releasing actions can be performed synchronously.

[0015] Preferably, the clamping action rod passes through one of the clamping blocks in each group and is fixedly connected thereto, one end of the clamping action rod is rotatably connected to the inner wall of the positioning roller, and the other end of the clamping action rod passes through the inner wall of the positioning roller and extends outward to the inside of the drive unit.

[0016] Preferably, the driving unit includes a shell and four clamping motors, the clamping motors are located inside the shell and fixedly connected to the inner wall of the shell, the clamping motors correspond one-to-one to the clamping action rods, the output ends of the clamping motors are fixedly connected to the ends of the clamping action rods extending into the driving unit, and a conductive slip ring is fixedly connected to one end of the shell close to the clamping motor, and the conductive slip ring is electrically connected to the clamping motor.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention provides a loading bin and a tightening assembly, and separates the stacked grille plates through a partition to ensure that they will not be misplaced during welding. The stacked grille plates can be pressed into the loading bin during movement through the pneumatic push rod and the push plate to prevent them from being displaced during movement. The combined action of the pneumatic push rod and the partition ensures that the single grille plate at the bottom can be stably separated and pushed to the predetermined position when the pushing block is in action.

[0019] 2. The present invention uses a welding gun body and a push block in combination. When the lifting action rod drives the welding gun body to descend, the push block descends synchronously. During the descent process, the push block first enters the loading slot and uses mechanical pressure to separate the individual grid plates. Then, the welding gun body and the plasma integrated welding head at the bottom continue to descend to the welding position, and welding can begin. By integrating the push welding steps into a continuous lifting action, the degree of automation and welding efficiency are improved.

[0020] 3. The present invention sets a positioning and filling component, utilizes the linear motion of the screw translation mechanism, and precisely rotates the positioning roller through the engagement of the action gear and the action rack, driving the clamping block group to switch between the filling position and the welding position, thereby achieving the function of filling the grid plate between the longitudinal beams and positioning it. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a forming device for intelligent manufacturing of ice making machines proposed by the present invention;

[0022] Figure 2 This is an overall structural assembly diagram of a forming device for intelligent manufacturing of ice making machines proposed by the present invention;

[0023] Figure 3 This is a structural schematic diagram of a welding assembly in a forming device for intelligent manufacturing of an ice maker proposed by the present invention;

[0024] Figure 4 This is a cross-sectional view of the internal structure of a positioning and filling component in a forming device for intelligent manufacturing of an ice maker proposed by the present invention;

[0025] Figure 5 This is a structural cross-sectional view of a clamping block in an expanded state in a forming device for intelligent manufacturing of an ice maker proposed by the present invention;

[0026] Figure 6 This is a front structural cross-sectional view of a fixture assembly in a forming device for intelligent manufacturing of an ice maker proposed by the present invention in a working state;

[0027] Figure 7 This is a schematic diagram of the back structure of a clamp assembly in a forming device for intelligent manufacturing of an ice maker proposed by the present invention in a working state;

[0028] Figure 8 This is a cross-sectional view of a welding and conveying assembly in a forming device for intelligent manufacturing of an ice maker proposed by the present invention in a standby state;

[0029] Figure 9 This is a cross-sectional view of the welding and conveying assembly in the working state of a forming device for intelligent manufacturing of an ice maker proposed by the present invention.

[0030] In the figure: 1. base; 2. ice tray; 201. bottom plate; 202. longitudinal beam; 203. grille plate; 3. positioning groove; 4. action rack; 5. screw translation mechanism; 6. moving frame; 601. installation cavity; 7. loading chamber; 8. welding gun body; 9. lifting action rod; 10. positioning roller; 11. clamping block; 12. action gear; 13. clamping action rod; 14. compartment; 15. loading groove; 16. pneumatic push rod; 17. push plate; 18. tooth groove; 19. plasma integrated welding head; 20. push block; 21. lifting motor; 22. housing; 23. clamping motor; 24. conductive slip ring. DETAILED DESCRIPTION

[0031] 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.

[0032] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "mounted / connected," and "connected" should be understood in a broad sense. For example, "connected" can mean 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 an indirect connection through an intermediate medium, and it can be internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention in specific circumstances.

[0034] Example, see Figures 1 to 9A forming device for intelligent manufacturing of ice making machines includes a base 1 and an ice making tray 2 composed of a bottom plate 201, a longitudinal beam 202, and a grille plate 203. The surface of the base 1 is provided with a positioning groove 3 and an action rack 4. A tightening component and a screw translation mechanism 5 are provided above the base 1. A welding assembly is provided in the screw translation mechanism 5. The welding assembly includes a moving frame 6. A semi-open loading bin 7 is provided on the top of the moving frame 6. A mounting cavity 601 is provided on the side wall of the moving frame 6. A welding and feeding component is provided in the mounting cavity 601. A positioning and filling component is provided at the bottom of the moving frame 6.

[0035] The welding delivery assembly includes a plurality of welding gun bodies 8, and a lifting action rod 9 is provided on the side of the welding gun body 8 away from the moving frame 6;

[0036] The positioning filling assembly includes a positioning roller 10. The outer wall of the positioning roller 10 is provided with a plurality of clamping blocks 11 that match the gap of the longitudinal beam 202 and an action gear 12 that matches the action rack 4. The interior of the positioning roller 10 is provided with a plurality of clamping action rods 13 that match the clamping blocks 11. One end of the positioning roller 10 is rotatably connected to the mobile frame 6, and the other end of the positioning roller 10 passes through the mobile frame 6. A driving unit is provided at one end of the positioning roller 10 that passes through the mobile frame 6.

[0037] It should be noted that the welding connection structure between the bottom plate 201 and the longitudinal beam 202 can be completed by using the automatic welding equipment in the prior art, and this process will not be described in detail below.

[0038] Furthermore, a compartment 14 is provided in the loading bin 7 to match the gap between the longitudinal beams 202. Stacked grid plates 203 are placed in the compartment 14. Loading slots 15 matching the pushing block 20 are provided on the upper and lower surfaces of the loading bin 7 away from the opening.

[0039] Furthermore, the abutment assembly includes a bracket fixedly mounted on the surface of the base 1, in which a plurality of pneumatic abutment rods 16 matching the gaps between the longitudinal beams 202 are fixedly mounted. An abutment plate 17 for abutting the stacked grid plates 203 is fixedly connected to one end of the pneumatic abutment rods 16 close to the loading bin 7.

[0040] It should be noted that the stacked grid plates 203 are formed by cutting aluminum alloy blocks, and the grid plates 203 are connected to each other through weak metal sheets reserved during cutting. This processing method is a prior art and will not be described in detail below.

[0041] A further advantage of adopting the above method is that the stacked grille plates 203 are separated by the compartment 14 to ensure that they will not be misaligned during welding. The stacked grille plates 203 can be pressed tightly into the loading bin 7 during movement through the pneumatic push rod 16 and the push plate 17 to prevent the stacked grille plates 203 from shifting in the loading bin 7 during operation, thereby ensuring that the stacked grille plates 203 are aligned with the loading slot 15. The joint action of the pneumatic push rod 16 and the compartment 14 ensures that the single grille plate 203 at the bottom can be stably separated and pushed to the predetermined position when the pushing block 20 is in action.

[0042] Furthermore, the welding gun body 8 is slidably connected to the mounting cavity 601. A tooth groove 18 is provided on the side of the welding gun body 8 away from the loading chamber 7. A plasma integrated welding head 19 is fixedly mounted on the bottom of the welding gun body 8. A push block 20 matching the grid plate 203 is fixedly connected to the top of the welding gun body 8.

[0043] It should be noted that the plasma integrated welding head 19 is composed of four welding heads, and the directions of the welding heads match the inner four corners of the grid in the ice tray 2.

[0044] Furthermore, a plurality of lifting gears matching the tooth grooves 18 are fixedly connected to the outer wall of the lifting action rod 9. The lifting gears are meshed with the tooth grooves 18. The end of the lifting action rod 9 is rotatably connected to the side wall of the installation cavity 601. The end of the lifting action rod 9 extends outward through the side wall of the installation cavity 601 and is fixedly connected to the lifting motor 21.

[0045] A further advantage of adopting the above method is that, through the coordinated use of the welding gun body 8 and the pushing block 20, when the lifting action rod 9 drives the welding gun body 8 to descend, the pushing block 20 descends synchronously. During the descent process, the pushing block 20 first enters the loading slot 15 and uses mechanical pressure to separate the single grid plate 203. Then, the welding gun body 8 and the plasma integrated welding head 19 at the bottom continue to descend to the welding position, and welding can begin. By integrating the push welding steps into a continuous lifting action, the degree of automation and welding efficiency are improved.

[0046] Furthermore, the clamping blocks 11 are arranged in groups of two around the central axis of the positioning roller 10, and the ends of the clamping blocks 11 are rotatably connected to the positioning roller 10. The ends of the clamping blocks 11 are configured in the shape of gears and mesh with each other, so that the clamping and releasing actions can be performed synchronously.

[0047] Furthermore, a clamping action rod 13 passes through one of the clamping blocks 11 in each group and is fixedly connected thereto. One end of the clamping action rod 13 is rotatably connected to the inner wall of the positioning roller 10, and the other end of the clamping action rod 13 passes through the inner wall of the positioning roller 10 and extends outwardly to the interior of the drive unit.

[0048] A further advantage of adopting the above method is that the linear motion of the screw translation mechanism 5 is utilized, and the positioning roller 10 is precisely rotated through the engagement of the action gear 12 and the action rack 4, driving the clamping block 11 group to switch between the filling position and the welding position, thereby achieving the function of filling the grid plate 203 between the longitudinal beams 202 and positioning it. The clamping action rod 13 drives the gear end of one of the clamping blocks 11 through the lifting gear thereon, and utilizes the engagement to drive the other clamping blocks 11 in the same group to perform the action synchronously, thereby achieving uniform distribution of clamping force and stable grasping of the grid plate 203.

[0049] Furthermore, the drive unit includes a housing 22 and four clamping motors 23. The clamping motors 23 are located inside the housing 22 and fixedly connected to the inner wall of the housing 22. The clamping motors 23 correspond one-to-one with the clamping action rods 13. The output ends of the clamping motors 23 are fixedly connected to the ends of the clamping action rods 13 extending into the drive unit. A conductive slip ring 24 is fixedly connected to one end of the housing 22 near the clamping motors 23. The conductive slip ring 24 is electrically connected to the clamping motors 23.

[0050] When the present invention is used, a worker places the semi-finished ice tray 2, with the bottom plate 201 and the longitudinal beam 202 welded together, into the positioning groove 3. The stacked grid plates 203 are then placed into the compartments 14 of the loading bin 7. Finally, an air pump in the prior art drives the pneumatic push rod 16 to extend, causing the push plate 17 to press against the stacked grid plates 203. This completes the work preparation.

[0051] The lifting motor 21 drives the lifting action rod 9 to rotate, and the lifting action rod 9 drives the welding gun body 8 and the pushing block 20 to descend synchronously by meshing with the tooth groove 18. During the descending process, the pushing block 20 enters from the top of the filling groove 15 and pushes the single grid plate 203 downwards, breaking the weak metal sheet between the grid plates 203 by pressure, and then pushes the grid plate 203 from the bottom of the filling groove 15 to between the clamping blocks 11, and uses the clamping blocks 11 to limit it to prevent the grid plate 203 from falling. Then, the clamping motor 23 corresponding to the clamping block 11 here is started, driving the clamping action rod 13 to rotate. The clamping action rod 13 rotates by meshing when rotating, and the clamping blocks 11 rotate synchronously in the opposite direction by meshing with each other to clamp the grid plate 203, completing one loading. After the loading is completed, the lifting motor 21 rotates in the opposite direction to reset the welding and feeding assembly. The above loading action will not be repeated below.

[0052] When welding, the device realizes automatic welding through the following actions:

[0053] Action 1: The screw translation mechanism 5 drives the moving frame 6 to perform a forward movement. The meshing of the action gear 12 and the action rack 4 drives the positioning roller 10 to roll 90 degrees during the forward movement, so that the state of the clamping block 11 group holding the grid plate 203 is as follows: Figure 6 As shown, at the same time, the next group of idle splints are aligned with the filling slot 15, and then the welding and delivery assembly performs the filling action again, and the grid plate 203 is loaded on the splint group here. During this process, the pneumatic rod 16 is synchronously decompressed by the air pump, while keeping it against the grid plate 203 and avoiding obstructing the movement of the moving frame 6. The action of the pneumatic rod 16 will not be repeated in the following actions;

[0054] Action 2, the mobile frame 6 performs a forward action, and the positioning roller 10 rolls 90° again during the forward process. At this time, the first grid plate 203 loaded enters the gap between the longitudinal beams 202 and is perpendicular to the bottom plate 201, while being close to the side wall of the longitudinal beam 202 and the upper surface of the floor, thereby achieving the effect of filling the grid plate 203 between the longitudinal beams 202 and positioning it in the subsequent welding process. Then, the welding and delivery assembly performs the loading and welding actions at the same time, and the welding gun body 8 starts during the descending process, and welds the end of one side of the grid plate 203 to the inner wall of the longitudinal beam 202 through the plasma integrated welding head 19 to complete the preliminary welding, and then the welding and delivery assembly is reset. At the same time, the clamping motor 23 corresponding to the grid plate 203 here rotates in the opposite direction, so that the clamping block 11 is expanded to Figure 5 The state shown is to release the grid plate 203, thereby preventing the grid plate 203 from blocking the movement of the positioning roller 10;

[0055] Action 3: The clamping block 11 deployed in action 2 is reset to position the next grid plate 203. The mobile frame 6 performs a forward movement, causing the positioning roller 10 to roll 90 degrees again during the forward movement. After achieving the effect in action 2, welding is performed. During welding, the welding gun body 8 is started during the descent process, and the end of the grid plate 203 facing the plasma integrated welding head 19 is welded to the inner wall of the longitudinal beam 202 through the plasma integrated welding head 19. At the same time, the end of the other side of the grid plate 203 that has completed the preliminary welding in action 2 is welded to the inner wall of the longitudinal beam 202. Finally, the welding assembly is reset.

[0056] Finally, the third step is repeated until all the grid plates 203 are welded and the ice tray 2 is welded and formed.

[0057] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A forming device for intelligent manufacturing of ice making machines, comprising a base (1) and an ice making tray (2) composed of a bottom plate (201), a longitudinal beam (202), and a grid plate (203), characterized in that: The surface of the base (1) is provided with a positioning groove (3) and an action rack (4); a tightening assembly and a screw translation mechanism (5) are provided above the base (1); a welding assembly is provided in the screw translation mechanism (5); the welding assembly includes a moving frame (6); a semi-open loading bin (7) is provided on the top of the moving frame (6); a mounting cavity (601) is provided on the side wall of the moving frame (6); a welding delivery assembly is provided in the mounting cavity (601); and a positioning filling assembly is provided at the bottom of the moving frame (6); The welding delivery assembly comprises a plurality of welding gun bodies (8), and a lifting action rod (9) is provided on a side of the welding gun body (8) away from the movable frame (6); The positioning filling assembly comprises a positioning roller (10), the outer wall of the positioning roller (10) is provided with a plurality of clamping blocks (11) matching the gap of the longitudinal beam (202) and an action gear (12) matching the action rack (4), the interior of the positioning roller (10) is provided with a plurality of clamping action rods (13) matching the clamping blocks (11), one end of the positioning roller (10) is rotatably connected to the moving frame (6), the other end of the positioning roller (10) passes through the moving frame (6), and the end of the positioning roller (10) passing through the moving frame (6) is provided with a driving unit.

2. The forming device for intelligent manufacturing of ice making machines according to claim 1, characterized in that: The loading bin (7) is provided with a compartment (14) matching the gap between the longitudinal beams (202), and stacked grid plates (203) are placed in the compartment (14). The loading bin (7) is provided with loading grooves (15) matching the pushing block (20) on the upper and lower surfaces away from the opening end.

3. The forming device for intelligent manufacturing of ice making machines according to claim 1, characterized in that: The abutting assembly comprises a bracket fixedly mounted on the surface of a base (1), wherein a plurality of pneumatic abutting rods (16) matching the gaps between longitudinal beams (202) are fixedly mounted in the bracket, and an abutting plate (17) for abutting against the stacked grating plates (203) is fixedly connected to one end of the pneumatic abutting rod (16) close to the loading bin (7).

4. The forming device for intelligent manufacturing of ice making machines according to claim 1, characterized in that: The welding gun body (8) is slidably connected to the mounting cavity (601); a tooth groove (18) is provided on a side of the welding gun body (8) away from the loading bin (7); a plasma integrated welding head (19) is fixedly mounted on the bottom of the welding gun body (8); and a push block (20) matching the grid plate (203) is fixedly connected above the welding gun body (8).

5. The forming device for intelligent manufacturing of ice making machines according to claim 4, characterized in that: The outer wall of the lifting action rod (9) is fixedly connected with a plurality of lifting gears matching the tooth grooves (18), and the lifting gears are meshed with the tooth grooves (18). The end of the lifting action rod (9) is rotatably connected with the side wall of the installation cavity (601). The end of the lifting action rod (9) extends outward through the side wall of the installation cavity (601) and is fixedly connected with the lifting motor (21).

6. The forming device for intelligent manufacturing of ice making machines according to claim 1, characterized in that: The clamping blocks (11) are arranged in groups of two around the central axis of the positioning roller (10), and the ends of the clamping blocks (11) are rotatably connected to the positioning roller (10). The ends of the clamping blocks (11) are arranged in a gear shape and mesh with each other, so that clamping and releasing actions can be performed synchronously.

7. The forming device for intelligent manufacturing of ice making machines according to claim 1, characterized in that: The clamping action rod (13) passes through one of the clamping blocks (11) in each group and is fixedly connected thereto; one end of the clamping action rod (13) is rotatably connected to the inner wall of the positioning roller (10); the other end of the clamping action rod (13) passes through the inner wall of the positioning roller (10) and extends outward to the interior of the drive unit.

8. The forming device for intelligent manufacturing of ice making machines according to claim 1, characterized in that: The drive unit comprises a shell (22) and four clamping motors (23), wherein the clamping motors (23) are located inside the shell (22) and are fixedly connected to the inner wall of the shell (22), wherein the clamping motors (23) correspond to the clamping action rods (13) one by one, wherein the output ends of the clamping motors (23) are fixedly connected to the ends of the clamping action rods (13) extending into the drive unit, and wherein a conductive slip ring (24) is fixedly connected to one end of the shell (22) close to the clamping motors (23), and wherein the conductive slip ring (24) is electrically connected to the clamping motors (23).

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