Novel lifting conveyor mechanism

Abstract

The novel lifting conveyor mechanism comprises supporting arms, the two ends of each supporting arm are each provided with a connecting frame, the number of the supporting arms is four, and the tops and the bottoms of the two ends of each connecting frame are each connected with one supporting arm; the two supporting arms located on the upper layer are connected through a plurality of first connecting arms and second connecting arms, the two supporting arms located on the lower layer are connected through two connecting supports, the bottom ends of the connecting supports are connected with the movable end of a three-axis air cylinder, and a connector is arranged at the bottom end of the three-axis air cylinder. Through cooperative use of the special-shaped limiting grooves and the limiting columns, the distance between the center of the shape defined by the friction layers on the two clamping tables and the central axis of the central column is a fixed value through the shapes of the special-shaped limiting grooves, and therefore the friction layers can clamp friction rods with different diameters with the maximum contact area all the time; when different friction rods are installed, the positions of the friction rods do not need to be adjusted.

Description

Technical Field

[0001] The invention belongs to the field of automated mechanical equipment, in particular to a novel lifting conveyor mechanism. Background Art

[0002] The silicon wafers are taken out from the basket by the telescopic belt conveyor, and the lifting conveyor is lifted to the designated position by the cylinder. The silicon wafers are transferred to the lifting conveyor by the belt conveyor, arranged on the lifting conveyor, and then lowered by the cylinder to reach the same height as the reversing conveyor, thus completing the next step.

[0003] The prior art still has some shortcomings. For example, due to the friction between the friction layer and the friction rod during operation, the diameter of the friction rod will be reduced. The common brake mechanism will cause a very large reduction in the contact surface due to the reduction in the diameter of the friction rod, which will easily lead to the release of the lock, thereby causing the friction rod to need to be replaced and installed, which greatly interferes with the production work of the device. Angle aluminum is used as the connecting column, and its bending strength is insufficient, resulting in poor stability of the entire mechanism. Silicon wafers are prone to shaking during the operation of the mechanism. The motor is installed on one side of the mechanism, and the force on the entire mechanism is uneven. When the cylinder rises or falls, one side of the mechanism will move first and the other side will be delayed, causing the silicon wafer to shift on the elevator. The three-axis cylinder is installed in the middle position of the mechanism, and there is a gap between the piston column of the three-axis cylinder itself and the cylinder wall, causing the mechanism to shake during lifting and lowering, and the running efficiency is greatly reduced. Therefore, a new lifting conveyor mechanism is proposed. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the following technical problems in the prior art: when the cylinder rises or descends, one side of the mechanism will move first and the other side will be delayed, causing the silicon wafer to shift on the elevator; the three-axis cylinder is installed in the middle position of the mechanism, and there is a gap between the piston column of the three-axis cylinder itself and the cylinder wall, causing the mechanism to shake during lifting and lowering, and the wafer running efficiency is greatly reduced.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a novel lifting conveyor mechanism, comprising a supporting arm, wherein there are four supporting arms, the four supporting arms are parallel to each other, both ends of the four supporting arms are connected to a connecting frame, and the top and the bottom of both ends of the connecting frame are respectively connected to a supporting arm;

[0007] The two support arms at the upper layer are connected by several connecting arms, the two support arms at the same height are connected by several connecting arms, and the two support arms at the lower layer are connected by two connecting brackets, the bottom ends of the connecting brackets are connected to the movable ends of the three-axis cylinders, and the bottom ends of the three-axis cylinders are provided with joints;

[0008] The front and back sides of the connecting frame are rotatably connected to two belt rollers 1, the belt passes around the outside of the belt roller 1, the belt is sleeved on the outside of the support arm, and the belt is movably connected to the support arm;

[0009] The middle parts of the two support arms located at the lower layer are connected with a power assembly.

[0010] As an optimal technical solution for a new type of lifting conveyor mechanism, the power assembly includes a belt roller two, a belt roller three, a side bracket and a workbench. A side bracket is provided at each end of the workbench. A belt roller three and two belt rollers two are screwed onto each side bracket. The belt passes around the two belt rollers two and wraps around three-fifths of the outer circumference of the belt roller three. The two power ends of the dual-axis motor on the inner side of the workbench are correspondingly connected to the two belt rollers three, and the side bracket is correspondingly connected to the support arm.

[0011] As a preferred technical solution for a new type of lifting conveyor mechanism, the emergency stop locking assembly includes a brake seat, a center column is installed on the upper side of the brake seat, two special-shaped limiting grooves are reserved on one side of the brake seat, and the two special-shaped limiting grooves are arranged on both sides of the center column, two clamping arms are crossed with each other, and the two clamping arms are rotatably connected to the same center column, and a clamping seat is installed at one end of each clamping arm, and a pulling column is installed on the clamping seat, and the lower side of the pulling column is screwed to the clamping arm, and one side of the clamping seat is fixedly connected to the clamping platform, and a limiting column is installed on the lower side of the other side of the clamping seat, and the limiting column is inserted into the special-shaped limiting groove, and the opposite surface of the clamping platform is arc-shaped, and a friction layer is installed on the arc-shaped surface of the clamping platform;

[0012] As the friction between the friction layer and the friction rod causes the diameter of the friction rod to decrease continuously, the clamping table with the friction layer can lock the friction rod and brake the friction layer. The shape of the special-shaped limiting groove makes the distance between the center of the shape surrounded by the friction layers on the two clamping tables and the central axis of the center column a constant value, so that the friction layer can always clamp friction rods of different diameters with the largest contact area. When installing different friction rods, the position of the friction rod does not need to be adjusted.

[0013] The emergency stop locking assembly includes a brake seat, a center column, a special-shaped limiting groove, a clamping arm, a clamping seat, a pulling column and a clamping platform. A groove is recessed on the other side of the brake seat that deviates from the special-shaped limiting groove. The groove is movably connected with an abutment column, one end of which is located between two clamping arms. When the abutment column moves forward, it pushes one end of the clamping arm to separate, and the other end of the clamping arm also separates, so that the clamping platforms on the two clamping arms move away from each other. The clamping assembly includes a pulling column and an elastic member. The abutment column is connected to an operating assembly. The operating assembly is used to control the translation of the abutment column, and the abutment column can control the clamping assembly of the clamping arm to relax, so as to move forward. This causes the friction layers on the two clamping tables to move away from each other. During the retreat of the abutment column, the clamping assembly releases potential energy, and the clamping assembly pulls the clamping arm 1 together. The clamping arm 1 brings the clamping seat closer to each other, so that the two clamping tables can clamp the friction rod between the two clamping tables. A connecting hole is reserved on the clamping seat, and the connecting hole is connected to the pulling column. The lower side of the pulling column is connected to the clamping arm 1, and the pulling column is screwed to the clamping arm 1. The two pulling columns are respectively connected to the two ends of the elastic member 1. The clamping assembly has a simple structure and is easy to maintain. The limit column moves along the direction of the special-shaped limiting groove due to the limitation of the special-shaped limiting groove.

[0014] As an optimal technical solution for a new type of lifting conveyor mechanism, a constraint platform is threadedly connected to the screw rod, a constraint channel is recessed on one side of the channel adjacent to the center column, the screw rod is screwed in the constraint channel, a thread connection hole is recessed at the lower part of the abutment column, the thread connection hole is threadedly connected to the screw rod, one end of the screw rod passes through the thread connection hole and is clamped with a limit plate, the screw rod is also threadedly connected to the constraint platform, the constraint platform and the limit plate are arranged on both sides of the abutment column, the diameter of the constraint platform is larger than the diameter of the constraint channel, the constraint platform and the limit plate limit the position of the abutment column, a thread connection section is preset at the lower side of the abutment column, the thread connection section is threadedly connected to a hexagonal sleeve, the diameter of the hexagonal sleeve is larger than the lateral width of the channel, the constraint platform limits the position of the abutment column, so that the upper side of the hexagonal sleeve moves against the lower side of the brake seat;

[0015] The servo motor controls the rotation of the lead screw, and the lead screw controls the movement of the abutment column. The abutment column cooperates with the clamping assembly to control the clamping or loosening of the friction layer on the clamping table, so that the friction layer is braked.

[0016] The beneficial effects of the novel lifting conveyor mechanism of the present invention are as follows: through the coordinated use of the special-shaped limiting groove and the limiting column, the shape of the special-shaped limiting groove is used to make the distance between the center of the shape surrounded by the friction layers on the two clamping tables and the central axis of the central column a constant value, so that the friction layer can always clamp the friction rods of different diameters with the largest contact area, and when installing different friction rods, the position of the friction rod does not need to be adjusted;

[0017] By using three-axis cylinders and connecting brackets, the structure is compact, the interior is made of corrosion-resistant materials, and has high rigidity and high precision; during the lifting process, the mechanism runs more smoothly, while ensuring the safety of the silicon wafers and greatly improving the wafer running efficiency; the entire mechanism is compactly designed, with good overall stability and high strength, and is easy to disassemble as a whole during later maintenance; the dual-axis motor is installed in the middle area of ​​the mechanism, eliminating the problem of uneven force on the mechanism, and the connecting columns always remain at the same level during the lifting process; the dual-axis motor installation position can be adjusted according to the design requirements of the multi-channel conveyor mechanism to avoid interference with the conveyor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0019] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0020] Figure 2 It is a structural schematic diagram of the emergency stop locking assembly of the present invention;

[0021] Figure 3 The three-dimensional structure of the emergency stop locking assembly of the present invention is shown in FIG. Figure 1 ;

[0022] Figure 4 The three-dimensional structure of the emergency stop locking assembly of the present invention is shown in FIG. Figure 1 ;

[0023] Figure 5 It is a front view of the emergency stop locking assembly of the present invention;

[0024] Figure 6 It is a rear view of the emergency stop locking assembly of the present invention;

[0025] Figure 7 It is a schematic diagram of the connection between the clamping seat and the clamping platform of the present invention;

[0026] Figure 8 It is a schematic cross-sectional structure diagram of the emergency stop locking assembly of the present invention;

[0027] Fig. 9 It is the location of the L line of the present invention.

[0028] 1. Support arm; 2. Connecting frame; 3. Belt roller one; 4. Belt roller two; 5. Belt roller three; 6. Belt; 7. Side bracket; 8. Workbench; 9. Three-axis cylinder; 10. Joint; 11. Connecting bracket; 12. Brake seat; 13. Center column; 14. Special-shaped limiting groove; 15. Clamping arm one; 16. Clamping seat; 17. Pulling column; 18. Clamping platform; 19. Friction layer; 21. Limiting column; 22. Channel; 23. Abutting column; 232. Threaded section; 25. Connecting hole; 26. Elastic part one; 27. Screw rod; 28. Constraint platform; 29. ​​Constraint channel; 31. Limiting plate; 32. Hexagonal sleeve; 33. Servo motor; 34. Friction rod; 35. Connecting arm one; 36. Connecting arm two. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0033] like Figure 1 As shown, the present invention proposes a novel lifting conveyor mechanism, comprising a support arm 1, wherein there are four support arms 1, the four support arms 1 are parallel to each other, both ends of the four support arms 1 are connected to a connecting frame 2, and the top and bottom of both ends of the connecting frame 2 are respectively connected to a support arm 1;

[0034] The two support arms 1 located at the upper layer are connected by a plurality of connecting arms 36, the two support arms 1 located at the same height are connected by a plurality of connecting arms 35, and the two support arms 1 located at the lower layer are connected by two connecting brackets 11, the bottom end of the connecting bracket 11 is connected to the movable end of the three-axis cylinder 9, and the bottom end of the three-axis cylinder 9 is provided with a joint 10;

[0035] The front and back sides of the connecting frame 2 are rotatably connected to two belt rollers 3, the belt 6 passes around the outside of the belt roller 3, the belt 6 is sleeved on the outside of the support arm 1, and the belt 6 is movably connected to the support arm 1;

[0036] The middle parts of the two support arms 1 located at the lower layer are connected with a power assembly.

[0037] The power assembly includes a belt roller 2 4, a belt roller 3 5, a side bracket 7 and a workbench 8. A side bracket 7 is respectively provided at both ends of the workbench 8. A belt roller 3 5 and two belt rollers 2 4 are screwed onto each of the side brackets 7. The belt 6 passes around the two belt rollers 2 4 and wraps around three-fifths of the outer circumference of the belt roller 3 5. The two power ends of the dual-axis motor on the inner side of the workbench 8 are correspondingly connected to the two belt rollers 3 5, and the side bracket 7 is correspondingly connected to the support arm 1.

[0038] like Figures 2 to 9 As shown, the emergency stop locking assembly includes a brake seat 12, a center column 13 is installed on the upper side of the brake seat 12, two special-shaped limiting grooves 14 are reserved on one side of the brake seat 12, and the two special-shaped limiting grooves 14 are arranged on both sides of the center column 13, two clamping arms 15 cross each other, and the two clamping arms 15 are rotatably connected to the same center column 13, and a clamping seat 16 is installed at one end of each clamping arm 15, and a pulling column 17 is installed on the clamping seat 16. The lower side of 17 is screwed with the clamp arm 15, one side of the clamp seat 16 is fixedly connected with the clamping platform 18, and a limit column 21 is arranged on the lower side of the other side of the clamp seat 16, and the limit column 21 is inserted into the special-shaped limiting groove 14. The shape of the special-shaped limiting groove 14 makes the distance between the center of the shape surrounded by the friction layers 19 on the two clamping platforms 18 and the central axis of the center column 13 be a constant value, and the opposite surface of the clamping platform 18 is an arc shape, and the friction layer 19 is arranged on the arc surface of the clamping platform 18;

[0039] As the friction generated between the friction layer 19 and the friction rod 34 causes the diameter of the friction rod 34 to continue to decrease, the clamping platform 18 with the friction layer 19 can lock the friction rod 34 and brake the friction layer 19. Due to the shape of the special-shaped limiting groove 14, the distance between the center of the shape surrounded by the friction layers 19 on the two clamping platforms 18 and the central axis of the central column 13 is a constant, so that the friction layer 19 can always clamp the friction rods 34 of different diameters with the largest contact area and the best angle. When installing different friction rods 34, the position of the friction rod 34 does not need to be adjusted.

[0040] A channel 22 is recessed on the other side of the brake seat 12 that deviates from the special-shaped limiting groove 14, and the channel 22 is movably connected with an abutment column 23, one end of which is located between the two clamping arms 15. When the abutment column 23 moves forward, it pushes one end of the clamping arm 15 apart, and the other end of the clamping arm 15 is also separated, so that the clamping platforms 18 on the two clamping arms 15 move away from each other. The clamping assembly includes a pulling column 17 and an elastic member 26. The abutment column 23 is connected to an operating assembly, and the operating assembly is used to control the translation of the abutment column 23. The abutment column 23 can control the clamping assembly of the clamping arm 15 to relax, thereby causing the friction layers 19 on the two clamping platforms 18 to move away from each other. During the retreat of the connecting column 23, the clamping assembly releases potential energy, and the clamping assembly pulls the clamping arm 15 together, and the clamping arm 15 brings the clamping seat 16 closer to each other, so that the two clamping platforms 18 can clamp the friction rod 34 between the two clamping platforms 18. A connecting hole 25 is reserved on the clamping seat 16, and the connecting hole 25 is connected to the pulling column 17. The lower side of the pulling column 17 is connected to the clamping arm 15, and the pulling column 17 is screwed to the clamping arm 15. The two pulling columns 17 are respectively connected to the two ends of the elastic member 26. The clamping assembly has a simple structure and is easy to maintain. The limit column 21 moves along the direction of the special-shaped limiting groove 14 due to the limitation of the special-shaped limiting groove 14.

[0041] The screw rod 27 is threadedly connected with a constraint platform 28. A constraint channel 29 is recessed on one side of the channel 22 adjacent to the center column 13. The constraint channel 29 is screwed with the screw rod 27. A thread connection hole is recessed at the lower part of the abutment column 23. The thread connection hole is threadedly connected with the screw rod 27. One end of the screw rod 27 passes through the thread connection hole and is clamped with a limit plate 31. The screw rod 27 is also threadedly connected with the constraint platform 28. The constraint platform 28 and the limit plate 31 are arranged on the abutment column 23. 3, the diameter of the constraint platform 28 is larger than the diameter of the constraint channel 29, the constraint platform 28 and the limit plate 31 limit the position of the abutment column 23, the lower side of the abutment column 23 is preset with a wire segment 232, the wire segment 232 is wired to a hexagonal sleeve 32, the diameter of the hexagonal sleeve 32 is larger than the lateral width of the channel 22, the constraint platform 28 limits the position of the abutment column 23, so that the upper side of the hexagonal sleeve 32 moves against the lower side of the brake seat 12;

[0042] The servo motor 33 controls the screw rod 27 to rotate, and the screw rod 27 controls the movement of the abutment column 23. The abutment column 23 cooperates with the clamping assembly to control the clamping or loosening of the friction layer 19 on the clamping platform 18, so that the friction layer 19 is braked.

[0043] like Fig. 9 As shown, the intersection point of the perpendicular bisector of the shortest connecting line between the two ends of the contact surface of the friction rod 34 when the clamping table 18 is clamped is as, and a perpendicular line L is made from as to the central axis of the central column 13. The shape of the special-shaped limiting groove 14 ensures that the length of L is a constant, so that the shape of the special-shaped limiting groove 14 makes the distance between the center of the shape surrounded by the friction layers 19 on the two clamping tables 18 and the central axis of the central column 13 a constant, which enables the friction layer 19 to always clamp the friction rods 34 of different diameters with the largest contact area and the best angle. At the same time, when installing different friction rods 34, the position of the friction rod 34 does not need to be adjusted.

[0044] The specific implementation method is as follows: the servo motor 33 controls the screw rod 27 to rotate, the screw rod 27 controls the movement of the abutting column 23, and the abutting column 23 cooperates with the clamping assembly to control the friction layer 19 on the clamping table 18 to clamp or loosen. When the abutting column 23 moves away from the center column 13, the potential energy of the elastic member 26 is released to pull the clamping seat 16 and the clamping table 18 closer, and the friction layer 19 clamps the friction rod 34. Friction is generated between the friction layer 19 and the friction rod 34, so that the friction rod 34 cannot continue to rotate, so that the belt 6 stops running quickly to avoid material transportation accidents.

[0045] The dual-axis motor can control the belt roller three 5 to rotate, and the belt roller three 5 drives the belt 6 to operate, and the belt 6 can smoothly transport the silicon wafer.

[0046] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A new type of lifting conveyor mechanism, characterized in that: It comprises a support arm (1), wherein there are four support arms (1), the four support arms (1) are parallel to each other, both ends of the four support arms (1) are connected to a connecting frame (2), and the top and bottom of both ends of the connecting frame (2) are respectively connected to a support arm (1); The two support arms (1) located at the upper layer are connected by a plurality of connecting arms (36), the two support arms (1) located at the same height are connected by a plurality of connecting arms (35), and the two support arms (1) located at the lower layer are connected by two connecting brackets (11), and the bottom ends of the connecting brackets (11) are connected to the movable ends of the three-axis cylinders (9); The front and back sides of the connecting frame (2) are rotatably connected to two belt rollers (3), a belt (6) passes around the outside of the belt roller (3), the belt (6) is sleeved on the outside of the support arm (1), and the belt (6) is movably connected to the support arm (1); The middle parts of the two support arms (1) located at the lower layer are connected with a power assembly.

2. A novel lifting conveyor mechanism according to claim 1, characterized in that: The power assembly comprises a belt roller two (4), a belt roller three (5), a side bracket (7) and a workbench (8). A side bracket (7) is respectively arranged at both ends of the workbench (8). Each of the side brackets (7) is screwed with a belt roller three (5) and two belt rollers two (4). The belt (6) passes around the two belt rollers two (4) and wraps around three-fifths of the outer circumference of the belt roller three (5). The two power ends of the double-axis motor on the inner side of the workbench (8) are correspondingly connected to the two belt rollers three (5), and the side bracket (7) is correspondingly connected to the support arm (1).

3. A novel lifting conveyor mechanism according to claim 1, characterized in that: A joint (10) is provided at the bottom end of the three-axis cylinder (9).

4. A novel lifting conveyor mechanism according to claim 2, characterized in that: An emergency stop locking assembly is arranged between the dual-shaft motor and the friction rod (34).

5. A novel lifting conveyor mechanism according to claim 4, characterized in that: The emergency stop locking assembly comprises a brake seat (12), a clamping arm (15), a clamping seat (16) and a clamping platform (18), wherein a central column (13) is arranged on the upper side of the brake seat (12), two clamping arms (15) are intersected with each other, and the two clamping arms (15) are rotatably connected to the same central column (13), and a clamping seat (16) is arranged at one end of each clamping arm (15), and a clamping seat (16) is arranged on the clamping seat (16). A pulling column (17), the lower side of which is screwed to a clamping arm (15), one side of a clamping seat (16) is fixedly connected to a clamping platform (18), a limiting column (21) is arranged on the lower side of the other side of the clamping seat (16), the limiting column (21) is inserted into the special-shaped limiting groove (14), the opposite surface of the clamping platform (18) is in an arc shape, and a friction layer (19) is arranged on the arc-shaped surface of the clamping platform (18).

6. A novel lifting conveyor mechanism according to claim 5, characterized in that: A channel (22) is recessed on the other side of the brake seat (12) that deviates from the special-shaped limiting groove (14), and the channel (22) is movably connected to an abutment column (23), one end of which is located between the two clamping arms (15).

7. A novel lifting conveyor mechanism according to claim 6, characterized in that: A restraining channel (29) is concavely arranged on one side of the channel (22) adjacent to the center column (13), a screw rod (27) is screwed into the restraining channel (29), a restraining platform (28) is screwed into the screw rod (27), a screw hole is concavely arranged at the lower part of the abutting column (23), the screw hole is screwed into the screw rod (27), one end of the screw rod (27) passes through the screw hole and is clamped into the limit plate (31), and the screw rod (27) is also screwed into the restraining platform (28). The constraint platform (28) and the limiting plate (31) are arranged on both sides of the abutment column (23). The diameter of the constraint platform (28) is larger than the diameter of the constraint channel (29). The constraint platform (28) and the limiting plate (31) limit the position of the abutment column (23). A wire connecting section (232) is preset at the bottom of the abutment column (23). The wire connecting section (232) is connected to a hexagonal sleeve (32) by wire. The diameter of the hexagonal sleeve (32) is larger than the lateral width of the channel (22).

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