Loading mechanism for nuclear reactor full-size cladding and control rod guide tube coating

Abstract

The invention discloses a loading mechanism for a nuclear reactor full-size cladding and control rod guide tube coating, and relates to the field of loading mechanisms, the loading mechanism comprises a frame body, the frame body is internally provided with a lifting mechanism, the lifting mechanism comprises a cylinder base, a cylinder body and a cylinder trunnion seat, a supporting frame is fixedly connected to one side of the air cylinder trunnion base, two sets of lifting hinges are rotationally connected to one end of the supporting frame, and a limiting mechanism is movably installed at the top of the supporting frame and comprises a limiting plate. According to the invention, the lifting mechanism is arranged, and a lower end limiting mechanism, a plurality of middle supporting plates with grooves and an upper end annular clamp mechanism are matched for use, so that a long pipe is prevented from bending, shifting and falling out in the erecting process, pipe bending caused by manual pipe erecting is avoided, the number of operators is reduced, and the operation efficiency is improved; and the limiting mechanism, the supporting plate and the annular clamp can be exchanged to meet the loading of the pipes with different diameters.

Description

Technical Field

[0001] The invention relates to the technical field of loading mechanisms, in particular to a loading mechanism for coatings of a full-size cladding and a control rod guide tube of a nuclear reactor. Background Art

[0002] Full-size cladding tubes and control rod guide tubes (extra-long thin tubes) are key components of nuclear power and require high straightness. During the coating process, the cladding tubes and control rod guide tubes need to be placed vertically instead of horizontally so that they can be hoisted on the fixture of the coating machine. Currently, there are many ways to realize the vertical mechanism, such as hydraulic, cylinder, motor, etc. as the power to realize the vertical function.

[0003] However, in the prior art, there are multiple ways to implement the uprighting mechanism. Since the cladding tube and the control rod guide tube are extra-long thin tubes, they are easily bent during the uprighting process, resulting in excessive straightness. This cannot meet the requirement of preventing bending and bumping when the extra-long thin tubes are upright. In view of the above problems, a loading mechanism for coating the full-size cladding and control rod guide tube of a nuclear reactor is proposed. Summary of the invention

[0004] The object of the present invention is to provide a loading mechanism for coating of a full-size cladding and control rod guide tube of a nuclear reactor, so as to solve the problem that there are multiple implementation methods of the uprighting mechanism proposed in the above-mentioned background technology. Since the cladding tube and the control rod guide tube are extra-long thin tubes, they are prone to bending during the uprighting process, resulting in excessive straightness, and the requirements for preventing bending and bumping when the extra-long thin tubes are upright cannot be met.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a loading mechanism for coating of a full-size cladding and control rod guide tube of a nuclear reactor, comprising a frame body, two sets of universal wheels and two sets of directional wheels, a lifting mechanism is arranged inside the frame body, the lifting mechanism comprises a cylinder base, a cylinder body and a cylinder trunnion seat, a support frame is fixedly connected to one side of the cylinder trunnion seat, two sets of lifting hinges are rotatably connected to one end of the support frame, a limiting mechanism is movably installed on the top of the support frame, the limiting mechanism comprises a limiting plate, a plurality of limiting grooves are arranged inside the limiting plate, two sets of support plates are fixedly installed on the top of the support frame, a ring clamp is fixedly installed on the top of the support frame, and a controller is fixedly installed on one side of the frame body; The limit plate is made of PVC material, and the side is processed with multiple side-by-side limit grooves with an aperture of 10mm and a depth of 5mm. The position of the limit plate on the support frame is adjustable. The support plate is a PVC plate with multiple side-by-side and spaced 10*10mm grooves, and the groove interval is 3-5mm. The cladding tube and the control rod guide tube are placed in the square groove to prevent the cladding and the control rod guide tube from being bumped and scratched. The ring clamp is a pipe clamp with a V-shaped opening made of highly elastic metal. The ring clamp is fixed on the top support frame. When clamping the pipe, adjust the position of the limit mechanism according to the length of the pipe so that the pipe is exposed 5-10mm from the ring clamp to facilitate pipe removal. The lower end limit mechanism, the middle support plate with multiple grooves, and the upper end ring clamp are used in combination to ensure that the long pipe does not bend, shift, or fall out during the upright process, avoid bending of the pipe caused by manual uprighting, save the number of operators, and improve work efficiency.

[0006] Preferably, the tops of the two groups of universal wheels are fixedly mounted on the bottom of the frame body, and the tops of the two groups of directional wheels are fixedly mounted on the bottom of the frame body. The frame body is welded with square steel pipes, and a blank area is reserved below one end to facilitate docking with the loading position of the coating machine. The two groups of universal wheels and the two groups of directional wheels are used to support the movement of the frame body and the mechanism.

[0007] Preferably, the bottom of the cylinder base is fixedly mounted inside the frame body, and the top of the cylinder base is rotatably connected to one end of the cylinder body.

[0008] Preferably, the output end of the cylinder body is rotatably connected to one side of the cylinder ear shaft seat, and one side of the two sets of lifting hinges is fixedly connected to one side of the frame body. The control system controls the air intake of compressed air to achieve smooth operation of the cylinder body. After the pipe is placed horizontally and stably, the cylinder body is started to extend its piston rod, thereby gradually pushing one side of the support frame to a vertical state.

[0009] Preferably, four groups of stabilizing mechanisms are arranged throughout the interior of the frame body, and the stabilizing mechanisms include mounting rods, threaded rods and stabilizing seats. The four groups of threaded rods are rotated to make the threaded rods rotate inside the mounting rods. The threaded rods move in the vertical direction while rotating inside the mounting rods, and the threaded rods drive the stabilizing seats to move downward until the bottom of the stabilizing seats touches the ground. The four groups of stabilizing seats are adjusted to contact the ground in the same way. Since the friction between the stabilizing seats and the ground is large, the four groups of stabilizing seats stabilize the frame body in this position.

[0010] Preferably, the outer wall of the mounting rod is installed through the interior of the frame body, and the outer wall of the threaded rod is threadedly connected to the inner wall of the mounting rod.

[0011] Preferably, the top of the stabilizing seat is fixedly connected to the bottom of the threaded rod, and the stabilizing seat is arranged below the mounting rod.

[0012] Preferably, the limit plate is movably provided with four groups of limit rods inside, and a clamping plate is fixedly installed on one side of each two groups of limit rods. The clamping plates are pulled toward both sides so that one side of the clamping plates is not in contact with the support frame, and the clamping plates drive the limit rods to move. While one end of the limit rod moves inside the limit plate, the reset spring is compressed, and the position of the limit mechanism is manually adjusted.

[0013] Preferably, a return spring is provided on the outer wall of the limit rod, and one side of the clamping plate is in contact with one side of the support frame. When the clamping plates on both sides of the limit plate are loosened, the return spring rebounds and drives one end of the limit rod to move toward the inside of the limit plate, so that the limit rod drives the clamping plate to contact one side of the clamping plate.

[0014] Preferably, one end of the return spring is fixedly connected to one side of the limiting rod, and the other end of the return spring is fixedly connected to the inner wall of the limiting plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, a lifting mechanism is provided, and a lower end limiting mechanism, a middle multi-channel support plate with grooves, and an upper end ring clamp mechanism are used in combination to ensure that the long tube does not bend, shift, or fall out during the erection process, thereby avoiding bending of the tube caused by manual erection, saving the number of operators, and improving operating efficiency. Compressed air is used as power to avoid the use of motors, hydraulic mechanisms, etc., which are prone to oil droplets and oil and gas pollution of the cladding tube and the control rod guide tube. The structure is simple in design and easy to process and manufacture. The position of the limiting mechanism can be simply adjusted to meet the loading of tubes of different lengths, and the limiting mechanism, support plate, and ring clamp can be replaced to meet the loading of tubes of different diameters.

[0016] 2. In the present invention, by setting a stabilizing mechanism, the threaded rod rotates inside the mounting rod while moving in the vertical direction, and the threaded rod drives the stabilizing seat to move downward until the bottom of the stabilizing seat contacts the ground, and the four groups of stabilizing seats are adjusted to contact the ground in the same way. Since the friction between the stabilizing seat and the ground is relatively large, the four groups of stabilizing seats stabilize the frame body in this position, and an empty space is set at the front end of the frame body to avoid interference with the coating machine during docking, and a stabilizing seat is set to ensure the stability of the mechanism after the docking is completed.

[0017] 3. In the present invention, a limit mechanism is provided, the clamping plates on both sides of the limit plate are loosened, and the return spring rebounds to drive one end of the limit rod to move toward the inside of the limit plate, so that the limit rod drives the clamping plate to contact one side of the clamping plate, thereby realizing that the two groups of clamping plates drive the limit plates to be fixed somewhere on the top of the support frame, and the bottom of the pipe is inserted into the inside of the limit groove, and is fixed on the support plate and the annular clamp in turn, so that the pipe is exposed 5-10mm from the annular clamp, which is convenient for taking out the pipe, and the position of the limit plate can be simply adjusted to meet the loading of pipes of different lengths. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural schematic diagram of a loading mechanism for coating of a full-size cladding and control rod guide tube of a nuclear reactor according to the present invention; Figure 2 It is a schematic diagram of the internal structure of a loading mechanism for coating a full-size cladding and control rod guide tube of a nuclear reactor according to the present invention; Figure 3 It is a schematic diagram of the top structure of a loading mechanism for coating of a full-size cladding and control rod guide tube of a nuclear reactor according to the present invention; Figure 4 It is a three-dimensional structural schematic diagram of a stabilizing mechanism of a loading mechanism for a coating of a full-size cladding and control rod guide tube of a nuclear reactor according to the present invention; Figure 5 It is a three-dimensional structure explosion diagram of a stabilizing mechanism of a loading mechanism for a coating of a full-size cladding and control rod guide tube of a nuclear reactor according to the present invention; Figure 6 It is a three-dimensional structural schematic diagram of a limit plate of a loading mechanism for coating of a full-size cladding and control rod guide tube of a nuclear reactor according to the present invention; Figure 7 The present invention is a three-dimensional structural exploded view of a limit plate of a loading mechanism for coating a full-size cladding and control rod guide tube of a nuclear reactor.

[0019] In the figure: 1. frame body; 2. universal wheel; 3. directional wheel; 4. lifting mechanism; 41. cylinder base; 42. cylinder body; 43. cylinder ear shaft seat; 44. support frame; 45. lifting hinge; 5. limiting mechanism; 51. limiting plate; 52. limiting groove; 53. limiting rod; 54. clamping plate; 55. reset spring; 6. support plate; 7. ring clamp; 8. controller; 9. stabilizing mechanism; 91. mounting rod; 92. threaded rod; 93. stabilizing seat. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0021] Reference Figure 1-3As shown: a loading mechanism for coating a full-size cladding and control rod guide tube of a nuclear reactor, comprising a frame body 1, two sets of universal wheels 2 and two sets of directional wheels 3, a lifting mechanism 4 is arranged inside the frame body 1, the lifting mechanism 4 comprises a cylinder base 41, a cylinder body 42 and a cylinder trunnion seat 43, a support frame 44 is fixedly connected to one side of the cylinder trunnion seat 43, one end of the support frame 44 is rotatably connected to two sets of lifting hinges 45, a limiting mechanism 5 is movably installed on the top of the support frame 44, the limiting mechanism 5 comprises a limiting plate 51, a plurality of limiting grooves 52 are arranged inside the limiting plate 51, and the support frame 4 4 is fixedly installed with two groups of support plates 6 on the top, a ring clamp 7 is fixedly installed on the top of the support frame 44, a controller 8 is fixedly installed on one side of the frame body 1, the tops of the two groups of universal wheels 2 are fixedly installed with the bottom of the frame body 1, the tops of the two groups of directional wheels 3 are fixedly installed with the bottom of the frame body 1, the bottom of the cylinder base 41 is fixedly installed with the inside of the frame body 1, the top of the cylinder base 41 is rotatably connected to one end of the cylinder body 42, the output end of the cylinder body 42 is rotatably connected to one side of the cylinder ear shaft seat 43, and one side of the two groups of lifting hinges 45 is fixedly connected with one side of the frame body 1.

[0022] In this embodiment, the frame body 1 is welded with a square steel pipe, and a blank area is reserved at the bottom of one end to facilitate docking with the coating machine loading position. Two sets of universal wheels 2 and two sets of directional wheels 3 are used to support the movement of the frame body 1 and the mechanism. When in use, the mechanism is first moved to the coating machine loading position and stabilized at this position. The pipes are then placed horizontally on the top of the support frame 44 in turn. The limit plate 51 is made of PVC material, and a plurality of side-by-side limit grooves 52 are processed on the side with an aperture of 10 mm and a depth of 5 mm. The position of the limit plate 51 on the support frame 44 is The support plate 6 is a PVC plate with multiple 10*10mm slots arranged side by side and spaced apart, and the slot spacing is 3-5mm. The cladding tube is placed in the square slot to prevent the cladding tube from being bumped and scratched. The ring clamp 7 is a pipe clamp made of highly elastic metal with a V-shaped opening. The ring clamp 7 is fixed on the top support frame 44. When clamping the pipe, the position of the limit mechanism 5 is adjusted according to the length of the pipe so that the pipe is exposed by 75-10mm of the ring clamp, which is convenient for taking the pipe. The controller 8 is provided with a control module inside, which is controlled by the control system. The air intake of the compressed air is controlled to realize the smooth operation of the cylinder body 42. After the pipe is placed horizontally and stably, the cylinder body 42 is started to extend its piston rod, thereby gradually pushing one side of the support frame 44 to a vertical state. The support frame 44 rotates on one side of the lifting hinge 45, and the two ends of the cylinder body 42 rotate on one side of the cylinder base 41 and the cylinder ear shaft seat 43. The support frame 44 drives the pipe to gradually stand vertically until the pipe is in a vertical state. By setting the lifting mechanism 4, adopting the lower end limit mechanism 5, and the middle multi-channel grooved support plate 6. The mechanism of the upper ring clamp 7 is used in conjunction to ensure that the long tube does not bend, shift, or fall out during the erection process, thereby avoiding bending of the tube caused by manual erection, saving the number of operators, and improving work efficiency. Compressed air is used as the power to avoid the use of motors, hydraulic mechanisms, etc., which are prone to oil droplets and oil and gas pollution of the shelled tube. The structure is simple in design and easy to process and manufacture. The position of the limiting mechanism 5 can be simply adjusted to meet the loading of tubes of different lengths. The loading of tubes of different diameters can be met by replacing the limiting mechanism 5, the support plate 6, and the ring clamp 7. Example

[0023] Figure 1-Figure 5 As shown, four groups of stabilizing mechanisms 9 are arranged throughout the interior of the frame body 1, and the stabilizing mechanism 9 includes a mounting rod 91, a threaded rod 92 and a stabilizing seat 93. The outer wall of the mounting rod 91 is installed throughout the interior of the frame body 1, the outer wall of the threaded rod 92 is threadedly connected to the inner wall of the mounting rod 91, the top of the stabilizing seat 93 is fixedly connected to the bottom of the threaded rod 92, and the stabilizing seat 93 is arranged below the mounting rod 91.

[0024] In this embodiment, the mechanism is moved to the loading station of the coating machine. The frame body 1 is welded with square steel pipes, and a blank area is reserved below one end to facilitate docking with the loading station of the coating machine. After docking, the four groups of threaded rods 92 are rotated so that the threaded rods 92 rotate inside the mounting rods 91. By setting a stabilizing mechanism 9, the threaded rods 92 rotate inside the mounting rods 91 while moving in the vertical direction. The threaded rods 92 drive the stabilizing seats 93 to move downward until the bottom of the stabilizing seats 93 touches the ground. The four groups of stabilizing seats 93 are adjusted to contact the ground in the same way. Since the friction between the stabilizing seats 93 and the ground is large, the four groups of stabilizing seats 93 stabilize the frame body 1 in this position. An empty space is set at the front end of the frame body 1 to avoid interference with the coating machine during docking. The stabilizing seats 93 are set to ensure the stability of the mechanism after the docking is completed. Example

[0025] according to Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, four groups of limiting rods 53 are movably arranged inside the limiting plate 51, and a clamping plate 54 is fixedly installed on one side of each two groups of limiting rods 53. A return spring 55 is arranged on the outer wall of the limiting rod 53, and one side of the clamping plate 54 contacts with one side of the support frame 44. One end of the return spring 55 is fixedly connected to one side of the limiting rod 53, and the other end of the return spring 55 is fixedly connected to the inner wall of the limiting plate 51.

[0026] The clamping plate 54 is pulled to both sides so that one side of the clamping plate 54 is not in contact with the support frame 44, and the clamping plate 54 drives the limiting rod 53 to move. One end of the limiting rod 53 moves inside the limiting plate 51 and compresses the reset spring 55. After the position of the limiting mechanism 5 is manually adjusted, the limiting mechanism 5 is set to release the clamping plates 54 on both sides of the limiting plate 51. The reset spring 55 rebounds and drives one end of the limiting rod 53 to move inside the limiting plate 51, so that the limiting rod 53 drives the clamping plate 54 to contact one side of the clamping plate 54, so that the two groups of clamping plates 54 drive the limiting plate 51 to be fixed somewhere on the top of the support frame 44, and the bottom of the pipe is inserted into the limiting groove 52, and is fixed on the support plate 6 and the annular clamp 7 in turn, so that the pipe is exposed 75-10mm from the annular clamp, which is convenient for taking out the pipe. The position of the limiting plate 51 can be simply adjusted to meet the loading of pipes of different lengths.

[0027] The use method and working principle of this device: the frame body 1 is welded with square steel pipes, and a blank area is reserved at the bottom of one end to facilitate docking with the coating machine loading position. Two sets of universal wheels 2 and two sets of directional wheels 3 are used to support the movement of the frame body 1 and the mechanism. When in use, first move the mechanism to the coating machine loading position, and after docking, rotate the four sets of threaded rods 92 so that the threaded rods 92 rotate inside the mounting rods 91. The threaded rods 92 move in the vertical direction while rotating inside the mounting rods 91. The threaded rods 92 drive the stabilizing seats 93 to move downward until the bottom of the stabilizing seats 93 touches the ground. The four sets of stabilizing seats 93 are adjusted in the same way to contact the ground. The friction between 93 and the ground is relatively large, and then the four groups of stable seats 93 make the frame body 1 stable in this position. The pipes are placed horizontally on the top of the support frame 44 in turn. The limit plate 51 is made of PVC material, and the side is processed with multiple parallel limit grooves 52, with a hole diameter of 10mm and a depth of 5mm. The position of the limit plate 51 on the support frame 44 can be adjusted. The support plate 6 is a PVC plate processed with multiple parallel and spaced 10*10mm grooves, and the groove interval is 3-5mm. The control rod guide tube is placed in the square groove to avoid collision and scratching with the control rod guide tube. The ring clamp 7 is a pipe clamp made of highly elastic metal with a V-shaped opening. The ring clamp 7 is fixed at the most When the pipe is clamped on the support frame 44 at the top, the position of the limit mechanism 5 is adjusted according to the length of the pipe, and the clamping plate 54 is pulled to both sides so that one side of the clamping plate 54 does not contact the support frame 44, and the clamping plate 54 drives the limit rod 53 to move. While one end of the limit rod 53 moves inside the limit plate 51, the reset spring 55 is compressed. After manually adjusting the position of the limit mechanism 5, the clamping plates 54 on both sides of the limit plate 51 are released, and the reset spring 55 rebounds and drives one end of the limit rod 53 to move inside the limit plate 51, so that the limit rod 53 drives the clamping plate 54 to contact one side of the clamping plate 54, thereby realizing that the two groups of clamping plates 54 drive the limit plates 5 1 is fixed somewhere on the top of the support frame 44, and the bottom of the pipe is inserted into the inside of the limit groove 52, so that the pipe is exposed 75-10mm from the ring clamp, which is convenient for taking out the pipe. The controller 8 is provided with a control module inside, and the air intake of the compressed air is controlled by the control system to realize the smooth operation of the cylinder body 42. After the pipe is placed horizontally and stably, the cylinder body 42 is started to extend its piston rod, thereby gradually pushing one side of the support frame 44 to a vertical state, and the support frame 44 rotates on one side of the lifting hinge 45, and the two ends of the cylinder body 42 rotate on one side of the cylinder base 41 and the cylinder ear shaft seat 43, and the support frame 44 drives the pipe to gradually stand vertically until the pipe is in a vertical state.

[0028] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A loading mechanism for coating a full-size cladding and control rod guide tube of a nuclear reactor, comprising a frame body (1), two sets of universal wheels (2) and two sets of directional wheels (3), characterized in that: A lifting mechanism (4) is arranged inside the frame body (1), the lifting mechanism (4) comprising a cylinder base (41), a cylinder body (42) and a cylinder ear shaft seat (43), one side of the cylinder ear shaft seat (43) is fixedly connected to a support frame (44), one end of the support frame (44) is rotatably connected to two sets of lifting hinges (45), a limiting mechanism (5) is movably installed on the top of the support frame (44), the limiting mechanism (5) comprises a limiting plate (51), a plurality of limiting grooves (52) are arranged inside the limiting plate (51), two sets of support plates (6) are fixedly installed on the top of the support frame (44), a ring clamp (7) is fixedly installed on the top of the support frame (44), and a controller (8) is fixedly installed on one side of the frame body (1).

2. A loading mechanism for coating of a full-size cladding and control rod guide tube of a nuclear reactor according to claim 1, characterized in that: The tops of the two sets of universal wheels (2) are fixedly mounted on the bottom of the frame body (1), and the tops of the two sets of fixed wheels (3) are fixedly mounted on the bottom of the frame body (1).

3. A loading mechanism for coating of a full-size cladding and control rod guide tube of a nuclear reactor according to claim 1, characterized in that: The bottom of the cylinder base (41) is fixedly mounted inside the frame body (1), and the top of the cylinder base (41) is rotatably connected to one end of the cylinder body (42).

4. A loading mechanism for coating of a full-size cladding and control rod guide tube of a nuclear reactor according to claim 2, characterized in that: The output end of the cylinder body (42) is rotatably connected to one side of the cylinder trunnion seat (43), and one side of the two sets of lifting hinges (45) is fixedly connected to one side of the frame body (1).

5. A loading mechanism for coating of a full-size cladding and control rod guide tube of a nuclear reactor according to claim 1, characterized in that: Four groups of stabilizing mechanisms (9) are arranged throughout the interior of the frame body (1), and the stabilizing mechanisms (9) comprise a mounting rod (91), a threaded rod (92) and a stabilizing seat (93).

6. A loading mechanism for coating of a full-size cladding and control rod guide tube of a nuclear reactor according to claim 5, characterized in that: The outer wall of the mounting rod (91) is installed through the interior of the frame body (1), and the outer wall of the threaded rod (92) is threadedly connected to the inner wall of the mounting rod (91).

7. A loading mechanism for coating of a full-size cladding and control rod guide tube of a nuclear reactor according to claim 6, characterized in that: The top of the stabilizing seat (93) is fixedly connected to the bottom of the threaded rod (92), and the stabilizing seat (93) is arranged below the mounting rod (91).

8. A loading mechanism for coating of a full-size cladding and control rod guide tube of a nuclear reactor according to claim 1, characterized in that: Four groups of limit rods (53) are movably arranged inside the limit plate (51), and a clamping plate (54) is fixedly mounted on one side of every two groups of limit rods (53).

9. A loading mechanism for coating of a full-size cladding and control rod guide tube of a nuclear reactor according to claim 8, characterized in that: A return spring (55) is provided on the outer wall of the limiting rod (53), and one side of the clamping plate (54) is in contact with one side of the supporting frame (44).

10. A loading mechanism for coating of a full-size cladding and control rod guide tube of a nuclear reactor according to claim 9, characterized in that: One end of the return spring (55) is fixedly connected to one side of the limiting rod (53), and the other end of the return spring (55) is fixedly connected to the inner wall of the limiting plate (51).

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