A motor end cover docking device

Abstract

The present invention belongs to the technical field of motor production, and provides a motor end cover docking device, including a base, a substrate fixedly mounted on the base, a U-shaped groove provided on the substrate and a fixing assembly for fixing the motor end cover provided on the substrate, a slide plate slidably mounted on the base and a servo module for driving the slide plate to move provided on the base, so as to solve the technical problem in the prior art that it is difficult to accurately position the rotor and the end cover, resulting in difficulty in ensuring the quality of the rotor and the motor end cover after installation. The present invention first positions the motor end cover by a positioning rod and a positioning assembly, and then positions the rotor again by the positioning rod, both the motor end cover and the rotor are positioned by the positioning rod, and the basis for positioning the motor end cover and the rotor is the same, so as to ensure that the axes of the motor end cover and the rotor are in a coincident state after the positioning is completed. The present invention can be widely used in operation scenarios for accurate axis positioning.

Description

Technical Field

[0001] The invention belongs to the technical field of motor production, and in particular relates to a motor end cover docking device. Background Art

[0002] A motor is a device that converts electrical energy into mechanical energy. The motor includes workpieces such as a rotor, a stator and an end cover. During the motor assembly process, the rotor and the end cover need to be combined and installed. During the process of combining the rotor and the end cover, the rotor and the end cover need to be positioned to ensure that the two positions are aligned.

[0003] Most of the existing docking equipment, when in use, positions the end cover through a fixed positioning structure, and clamps and positions the rotor through a clamping structure, then aligns the two sets of positioning structures, and then rivets and installs the aligned rotor and motor end cover. However, since the rotor and the motor end cover are positioned by different positioning structures, and after the positioning is completed, the rotor or the end cover is moved and aligned when necessary during the process of aligning the rotor and the motor end cover, the rotor or the end cover is easily moved due to vibration or external force during the movement, which leads to errors in the positioning of the rotor or the end cover, making it difficult to ensure the accuracy of the positioning of the rotor and the end cover, and it is difficult to ensure the quality of the rotor and the motor end cover after installation. Summary of the invention

[0004] The purpose of the present invention is to provide a motor end cover docking device, aiming to solve the technical problem in the prior art that it is difficult to accurately position the rotor and the end cover, resulting in difficulty in ensuring the quality of the rotor and the motor end cover after installation.

[0005] The present invention is implemented as follows: a motor end cover docking device comprises a base, a base plate is fixedly mounted on the base, a U-shaped groove is arranged on the base plate and a fixing assembly for fixing the motor end cover is arranged on the base plate, a slide plate is slidably mounted on the base and a servo module for driving the slide plate to move is arranged on the base, a moving frame of a frame structure is slidably mounted on the slide plate and a first telescopic member for driving the moving frame to move is fixedly mounted on the slide plate;

[0006] A support plate that is in sliding contact with the base is fixedly installed at one end of the moving frame, and a limit block for placing the rotor is arranged on the support plate. Second telescopic members are fixedly installed on the side walls on both sides of the moving frame, and a plurality of groups of second balls that exist in pairs are arranged at the output end of the second telescopic members. The second balls located on both sides of the rotor move toward one side of the rotor at the same time and contact the rotor to achieve clamping and positioning of the rotor. A positioning rod for positioning the motor end cover is fixedly installed on the slide plate, and a positioning assembly is arranged on the positioning rod.

[0007] Further technical solution: A lifting plate is slidably installed on the support plate, the lifting plate is parallel to the support plate and the limit block is fixedly installed on the lifting plate, the limit block is a V-shaped structure and the vertical plane where the axis of the positioning rod is located is the symmetry plane of the limit block.

[0008] Further technical solution: A horizontal plate is fixedly installed at the output end of the second telescopic member, and two groups of pillars are fixedly installed at both ends of the horizontal plate. Multiple groups of second balls are respectively installed on the pillars, and the multiple groups of second balls located on the two groups of horizontal plates are axially symmetrically distributed about the axis of the positioning rod.

[0009] Further technical solution: the fixing assembly includes two groups of clamping plates, which are slidably mounted on a base plate and are located on the same side of the base plate. A first threaded rod is provided on the base plate to drive the two groups of clamping plates to move in opposite directions at the same time.

[0010] Further technical solution: a support block is fixedly installed on the end of the splint away from the substrate, a pressure rod is slidably installed on the support block, the pressure rod points to the substrate and a first ball is rotatably installed on the end close to the substrate, an elastic part is fixedly installed on the support block, and the end of the elastic part away from the support block is fixedly connected to the end of the pressure rod.

[0011] Further technical solution: a pad is slidably installed in the middle of the base plate, and a second threaded rod for driving the pad to move is rotatably installed on the base.

[0012] Further technical solution: The positioning assembly includes two groups of positioning top plates, which are installed on the positioning rod through telescopic rods and are symmetrically distributed. The positioning top plates move along the radial direction of the positioning rod. The surface of the positioning top plates away from the positioning rod is an arc structure. A third telescopic member is fixedly installed on the slide board to drive the two groups of positioning top plates to move simultaneously in a direction away from the positioning rod.

[0013] Further technical solution: a cavity is provided at one end of the positioning rod close to the skateboard, and a connecting rod extending into the cavity is slidably installed on the skateboard, the connecting rod and the positioning rod are coaxially arranged and the connecting rod is fixedly connected to the output end of the third telescopic member, and two groups of symmetrically distributed first connecting plates are rotatably installed at one end of the connecting rod located in the cavity, the first connecting plate extends out of the cavity and a second connecting plate is rotatably installed at its end, one end of the second connecting plate is rotatably installed on the positioning rod, and when the second connecting plate rotates in a direction away from the positioning rod, it pushes the positioning top plate to move in a direction away from the positioning rod.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The motor end cover is first positioned by the positioning rod and the positioning assembly, and then the rotor is positioned again by the positioning rod. Both the motor end cover and the rotor are positioned by the positioning rod. The basis for positioning the motor end cover and the rotor is the same, so as to ensure that the axis of the motor end cover and the rotor is in a coincident state after the positioning is completed, so as to achieve accurate and rapid positioning of the motor end cover and the rotor axis, improve the positioning accuracy of the motor end cover and the rotor axis, and ensure the quality of the rotor and the motor end cover after installation.

[0016] 2. After the motor end cover and the rotor are positioned, the rotor is clamped and fixed from both ends of the rotor by using a movable frame, a slide plate and a positioning rod. When clamping the rotor, an axial force can be applied to the rotor. Under the action of the axial force, the interference of non-axial external forces can be resisted, which can improve the stability of the rotor, further improve the accuracy of rotor positioning, ensure that the rotor is aligned with the motor end cover, and ensure the quality of the rotor and the motor end cover after installation.

[0017] 3. When the rotor moves through the motor end cover, the positioning rod is always used to limit and guide the end of the rotor shaft entering the motor end cover, so that the end of the rotor shaft can stably enter the motor end cover and pass through the mounting hole of the bearing, further improving the stability of the rotor during installation and ensuring the quality of the rotor and the motor end cover after installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of the clamping plate in the present invention.

[0020] Figure 3 It is a schematic diagram of the structure of the fixing component in the present invention.

[0021] Figure 4 for Figure 2 A magnified schematic diagram of the A1 region in the middle.

[0022] Figure 5 It is a schematic diagram of the structure of the positioning component in the present invention.

[0023] In the accompanying drawings: 1. base; 2. base plate; 3. clamping plate; 4. first threaded rod; 5. support block; 6. pressure rod; 7. elastic member; 8. first ball; 9. second threaded rod; 10. pad; 11. slide plate; 12. servo module; 13. moving frame; 14. first telescopic member; 15. positioning rod; 16. second telescopic member; 17. cross plate; 18. pillar; 19. second ball; 20. support plate; 21. lifting plate; 22. third threaded rod; 23. limit block; 24. cavity; 25. telescopic rod; 26. positioning top plate; 27. connecting rod; 28. first connecting plate; 29. ​​second connecting plate; 30. third telescopic member; 31. fixing component; 32. positioning component. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0026] like Figure 1-Figure 5 As shown, a motor end cover docking device provided by the present invention comprises a base 1, a base plate 2 is fixedly mounted on the base 1, a U-shaped groove is provided on the base plate 2 and a fixing assembly 31 for fixing the motor end cover is provided on the base plate 2, a slide plate 11 is slidably mounted on the base 1 and a servo module 12 for driving the slide plate 11 to move is provided on the base 1, a moving frame 13 of a frame structure is slidably mounted on the slide plate 11 and a first telescopic member 14 for driving the moving frame 13 to move is fixedly mounted on the slide plate 11;

[0027] A support plate 20 that is in sliding contact with the base 1 is fixedly installed at one end of the mobile frame 13, and a limit block 23 for placing the rotor is arranged on the support plate 20, and a lifting plate 21 is slidably installed on the support plate 20, and the lifting plate 21 is parallel to the support plate 20 and the limit block 23 is fixedly installed on the lifting plate 21, and the limit block 23 is a V-shaped structure and the vertical plane where the axis of the positioning rod 15 is located is the symmetry plane of the limit block 23, and the second telescopic member 16 is fixedly installed on the side walls on both sides of the mobile frame 13, and the output end of the second telescopic member 16 is provided with a plurality of groups of pairs. The second ball 19, a transverse plate 17 is fixedly installed at the output end of the second telescopic member 16, two groups of pillars 18 are fixedly installed at both ends of the transverse plate 17, and multiple groups of second balls 19 are respectively installed on the pillars 18. The multiple groups of second balls 19 located on the two groups of transverse plates 17 are axially symmetrically distributed about the axis of the positioning rod 15. The second balls 19 located on both sides of the rotor move toward one side of the rotor at the same time and contact with the rotor to achieve clamping and positioning of the rotor. A positioning rod 15 for positioning the motor end cover is fixedly installed on the slide plate 11, and a positioning assembly 32 is provided on the positioning rod 15.

[0028] In actual application of this embodiment, the motor end cover is placed and installed on the base plate 2 and preliminarily fixed by the fixing assembly 31. At this time, the motor end cover can move up and down, and the axis of the bearing in the motor end cover is slightly lower than the height of the axis of the positioning rod 15. At the same time, the iron core of the rotor is placed on the limit block 23. According to the size of the rotor, the lifting plate 21 is driven to move by the third threaded rod 22, so that the height of the axis of the rotor is slightly lower than the height of the axis of the positioning rod 15. At this time, the height adjustment of the limit block 23 is completed;

[0029] After that, the servo module 12 drives the slide plate 11 to move in the direction close to the base plate 2. After the positioning rod 15 passes through the mounting hole of the bearing in the motor end cover, the slide plate 11 stops moving. At this time, the motor end cover is positioned by the positioning component 32 so that the axis of the bearing in the motor end cover coincides with the axis of the positioning rod 15. After the motor end cover is positioned, it is fixed again by the fixing component 31. At this time, the motor end cover is in a fixed state, and the positioning rod 15 is no longer connected to the motor end cover.

[0030] After the motor end cover is positioned, the two groups of second telescopic members 16 simultaneously drive the cross plate 17 to move inward. When the second ball 19 contacts the rotor shaft, since the multiple groups of second ball 19 located on the two groups of cross plates 17 are axially symmetrically distributed about the axis of the positioning rod 15, and the height of the rotor axis is slightly lower than the height of the axis of the positioning rod 15, the second ball 19 will continue to move, causing the rotor to move upward away from the limit block 23, thereby allowing the rotor shaft to be clamped by the multiple groups of second ball 19 on both sides. At this time, the axis of the rotor coincides with the axis of the positioning rod 15, completing the positioning of the motor end cover and the rotor axis, and both are positioned by the positioning rod 15, and the basis for positioning the two is the same, thereby ensuring that the axes are in a coincident state after the positioning is completed, achieving accurate and rapid positioning of the motor end cover and the rotor axis, improving the positioning accuracy of the motor end cover and the rotor axis, and ensuring the quality of the rotor and the motor end cover after installation;

[0031] After the motor end cover and the rotor are positioned, the first telescopic member 14 drives the moving frame 13 to move so that the support plate 20 moves in the direction close to the base plate 2. When the end of the rotor shaft contacts the end of the positioning rod 15, the moving frame 13 continues to move. The rotor cannot continue to move due to the restriction of the positioning rod 15. At this time, the second ball 19 rolls along the rotor shaft until the moving frame 13 contacts the other end of the rotor shaft and applies pressure to the rotor. At this time, the rotor is fixed from both ends of the rotor by the moving frame 13, the slide plate 11 and the positioning rod 15, and an axial force is applied to the rotor at the same time. Under the action of the axial force, the interference of non-axial external forces can be resisted, the stability of the rotor can be improved, the accuracy of the rotor positioning can be further improved, the alignment of the rotor and the motor end cover can be ensured, and the quality of the rotor and the motor end cover after installation can be ensured. The positioning rod 15 is used to limit and guide one end of the rotor shaft entering the motor end cover, so that the end of the rotor shaft can stably enter the motor end cover and pass through the mounting hole of the bearing, further improving the stability of the rotor during the installation process, and ensuring the quality of the rotor and the motor end cover after installation.

[0032] Afterwards, the servo module 12 drives the slide plate 11 to move away from the substrate 2. At this time, the rotor can be pushed through the motor end cover by the movable frame 13 to complete the installation of the rotor and the motor end cover. After the installation is completed, the first telescopic member 14 contracts to make the movable frame 13 separate from the end of the rotor shaft. At this time, the fixing of the motor end cover by the fixing component 31 can be released to take out the installed motor end cover and the rotor upwards, and the above steps can be repeated to continue the installation of the rotor and the motor end cover.

[0033] In an example of the present embodiment, the first telescopic member 14 and the second telescopic member 16 are respectively the first electric telescopic rod and the second electric telescopic rod, and of course, they can also be other components that can actively change the length, such as a hydraulic cylinder. The first electric telescopic rod drives the movable frame 13 to move, thereby fixing the rotor, and the second electric telescopic rod drives the second ball 19 to move, thereby positioning and clamping the rotor.

[0034] like Figure 1-Figure 4 As shown, a motor end cover docking device provided by the present invention, the fixing assembly 31 includes two groups of clamping plates 3, the two groups of clamping plates 3 are slidably installed on the base plate 2 and are located on the same side of the base plate 2, and the base plate 2 is provided with a first threaded rod 4 that drives the two groups of clamping plates 3 to move in opposite directions at the same time.

[0035] Specifically, a support block 5 is fixedly installed at one end of the clamp 3 away from the base plate 2, a pressure rod 6 is slidably installed on the support block 5, the pressure rod 6 points to the base plate 2 and a first ball 8 is rotatably installed on the end of the pressure rod 6 close to the base plate 2, an elastic member 7 is fixedly installed on the support block 5, and the end of the elastic member 7 away from the support block 5 is fixedly connected to the end of the pressure rod 6.

[0036] Specifically, a backing plate 10 is slidably mounted in the middle of the base plate 2 , and a second threaded rod 9 for driving the backing plate 10 to move is rotatably mounted on the base 1 .

[0037] When this embodiment is actually used, the motor end cover is placed on the pad 10 and the side that is not connected to the stator component is close to the base plate 2. The height of the pad 10 is adjusted by the second threaded rod 9 according to the size of the motor end cover. After the motor end cover is placed on the pad 10, the axis height of the bearing on the motor end cover is slightly lower than the axis height of the positioning rod 15. Then, the first threaded rod 4 is rotated to drive the two sets of clamps 3 to move inward at the same time and contact the side of the motor end cover. The clamps 3 contact the side of the motor end cover but apply force. After the subsequent positioning of the motor end cover is completed, the clamps 3 clamp the motor end cover. During the movement of the clamps 3, the pressure rod 6 is manually pulled to move away from the base plate 2 and compress the elastic member 7. When the position of the clamps 3 is determined, the pressure rod 6 is released. At this time, under the action of the elastic member 7, the pressure rod 6 moves to one side of the base plate 2 until the first ball 8 contacts the motor end cover. The motor end cover is pressed on the base plate 2 by the force of the stretching deformation of the elastic member 7. At this time, the installation of the motor end cover is completed.

[0038] In an embodiment of the present invention, the elastic member 7 is a spring, and of course it can also be other elastic members such as an elastic ball, and the pressure is applied to the motor end cover through the stretching deformation of the spring.

[0039] like Figure 1 , Figure 5 As shown, a motor end cover docking device provided by the present invention, the positioning assembly 32 includes two groups of positioning top plates 26, the positioning top plates 26 are installed on the positioning rod 15 through the telescopic rod 25 and the two groups of positioning top plates 26 are symmetrically distributed, the positioning top plates 26 move along the radial direction of the positioning rod 15, and the surface of the positioning top plates 26 away from the positioning rod 15 is an arc structure, and the slide plate 11 is fixedly installed with a third telescopic member 30 that drives the two groups of positioning top plates 26 to move simultaneously in a direction away from the positioning rod 15.

[0040] Specifically, a cavity 24 is opened at one end of the positioning rod 15 close to the skateboard 11, and a connecting rod 27 extending into the cavity 24 is slidably installed on the skateboard 11. The connecting rod 27 is coaxially arranged with the positioning rod 15 and is fixedly connected to the output end of the third telescopic member 30. Two groups of symmetrically distributed first connecting plates 28 are rotatably installed at one end of the connecting rod 27 located in the cavity 24. The first connecting plate 28 extends out of the cavity 24 and a second connecting plate 29 is rotatably installed at its end. One end of the second connecting plate 29 is rotatably installed on the positioning rod 15. When the second connecting plate 29 rotates in a direction away from the positioning rod 15, it pushes the positioning top plate 26 to move in a direction away from the positioning rod 15.

[0041] When the motor end cover is installed, the slide plate 11 drives the positioning rod 15 to move in the direction close to the base plate 2. At this time, the bearing is installed in the motor end cover, so that the positioning rod 15 passes through the bearing mounting hole in the motor end cover. When the positioning top plate 26 enters the bearing mounting hole, the slide plate 11 stops moving. At this time, the third telescopic member 30 contracts and drives the connecting rod 27 to move. The connecting rod 27 pushes the second connecting plate 29 to rotate in the direction away from the positioning rod 15 through the first connecting plate 28. When the second connecting plate 29 rotates in the direction away from the positioning rod 15, its end contacts the positioning top plate 26 and pushes the positioning top plate 26 to move in the direction away from the positioning rod 15 until the two groups of positioning top plates 26 are respectively in contact with the bearing mounting holes. The upper and lower parts of the inner wall of the mounting hole are in contact at the same time. Since the height of the axis of the bearing on the motor end cover is slightly lower than the height of the axis of the positioning rod 15, the positioning top plate 26 will drive the motor end cover to move upward after completing the positioning of the motor end cover through the bearing, so that the axis of the bearing in the motor end cover coincides with the axis of the positioning rod 15, thereby completing the accurate positioning of the motor end cover. After the positioning of the motor end cover is completed, the first threaded rod 4 is rotated again so that the clamping plate 3 clamps and fixes the motor end cover. After the subsequent positioning of the rotor and the motor end cover is completed, the third telescopic member 30 is extended to drive the connecting rod 27 to reset. At this time, the second connecting plate 29 no longer applies thrust to the positioning top plate 26, and then the positioning top plate 26 no longer applies force to the bearing in the motor end cover, and the connection between the positioning rod 15 and the motor end cover is released.

[0042] In one embodiment of the present invention, the third telescopic member 30 is a third electric telescopic rod, and of course it can also be other components such as a hydraulic cylinder that can actively change the length. The third electric telescopic rod drives the two sets of positioning top plates 26 to move, thereby controlling the connection between the positioning rod 15 and the motor end cover.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0044] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A motor end cover docking device, comprising a base (1), on which a substrate (2) is fixedly mounted, characterized in that: The base plate (2) is provided with a U-shaped groove and a fixing assembly (31) for fixing a motor end cover is provided on the base plate (2); a slide plate (11) is slidably mounted on the base (1) and a servo module (12) for driving the slide plate (11) to move is provided on the base (1); a moving frame (13) of a frame structure is slidably mounted on the slide plate (11) and a first telescopic member (14) for driving the moving frame (13) to move is fixedly mounted on the slide plate (11); A support plate (20) that is in sliding contact with the base (1) is fixedly mounted on one end of the movable frame (13), a limit block (23) for placing the rotor is arranged on the support plate (20), second telescopic members (16) are fixedly mounted on both side walls of the movable frame (13), a plurality of groups of second balls (19) that exist in pairs are arranged at the output end of the second telescopic members (16), the second balls (19) located on both sides of the rotor move toward one side of the rotor at the same time and contact the rotor to clamp and position the rotor, a positioning rod (15) for positioning the motor end cover is fixedly mounted on the slide plate (11), and a positioning assembly (32) is arranged on the positioning rod (15); The fixing assembly (31) comprises two groups of clamping plates (3), the two groups of clamping plates (3) are slidably mounted on the base plate (2) and are located on the same side of the base plate (2), and a first threaded rod (4) is provided on the base plate (2) for driving the two groups of clamping plates (3) to move in opposite directions simultaneously; A support block (5) is fixedly mounted on one end of the clamping plate (3) away from the base plate (2); a pressure rod (6) is slidably mounted on the support block (5); the pressure rod (6) points toward the base plate (2) and a first ball (8) is rotatably mounted on the end of the pressure rod (6) close to the base plate (2); an elastic member (7) is fixedly mounted on the support block (5); and an end of the elastic member (7) away from the support block (5) is fixedly connected to the end of the pressure rod (6); A backing plate (10) is slidably mounted in the middle of the base plate (2), and a second threaded rod (9) for driving the backing plate (10) to move is rotatably mounted on the base (1).

2. The motor end cover docking device according to claim 1, characterized in that: A lifting plate (21) is slidably mounted on the support plate (20), the lifting plate (21) is parallel to the support plate (20) and a limit block (23) is fixedly mounted on the lifting plate (21), the limit block (23) is a V-shaped structure and the vertical plane where the axis of the positioning rod (15) is located is a symmetric plane of the limit block (23).

3. The motor end cover docking device according to claim 1, characterized in that: A transverse plate (17) is fixedly mounted on the output end of the second telescopic member (16), two sets of pillars (18) are fixedly mounted on both ends of the transverse plate (17), and a plurality of sets of second balls (19) are respectively mounted on the pillars (18), and the plurality of sets of second balls (19) located on the two sets of transverse plates (17) are axially symmetrically distributed about the axis of the positioning rod (15).

4. The motor end cover docking device according to claim 1, characterized in that: The positioning assembly (32) comprises two groups of positioning top plates (26), the positioning top plates (26) being mounted on the positioning rod (15) via telescopic rods (25) and the two groups of positioning top plates (26) being symmetrically distributed, the positioning top plates (26) moving along the radial direction of the positioning rod (15), the surfaces of the positioning top plates (26) away from the positioning rod (15) being an arc-shaped structure, and a third telescopic member (30) is fixedly mounted on the slide plate (11) for driving the two groups of positioning top plates (26) to move simultaneously in a direction away from the positioning rod (15).

5. The motor end cover docking device according to claim 4, characterized in that: A cavity (24) is formed at one end of the positioning rod (15) close to the slide plate (11), and a connecting rod (27) is slidably mounted on the slide plate (11) and extends into the cavity (24). The connecting rod (27) and the positioning rod (15) are coaxially arranged and the connecting rod (27) is fixedly connected to the output end of the third telescopic member (30). Two groups of symmetrically distributed first connecting plates (28) are rotatably mounted on one end of the connecting rod (27) located in the cavity (24). The first connecting plate (28) extends out of the cavity (24) and a second connecting plate (29) is rotatably mounted on the end thereof. One end of the second connecting plate (29) is rotatably mounted on the positioning rod (15). When the second connecting plate (29) rotates in a direction away from the positioning rod (15), it pushes the positioning top plate (26) to move in a direction away from the positioning rod (15).

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