Caterpillar link chain plate connecting hole drilling tool

Abstract

The utility model belongs to the technical field of caterpillar track link production, and discloses a caterpillar track link link plate connecting hole drilling tool which comprises a liquid storage tank, a bearing structure and a drilling structure, positioning blocks are arranged at the top of the liquid storage tank, the bearing structure comprises a bearing seat and bearing blocks, the bearing seat is movably arranged between the positioning blocks, and the drilling structure is arranged on the bearing seat. The bearing block is placed in the positioning groove, the drilling structure comprises an adjusting frame and a drilling column, and the drilling column is movably connected with the driving structure. The adjusting frame vertically moves under the action of the pushing structure to drive the driving structure and the drilling column to ascend or descend, the driving structure provides power for rotation of the drilling column, the drilling column conducts drilling treatment on the track link section in the bearing groove in the rotating process, a plurality of bearing blocks are arranged on the bearing seat, and the track link section in the bearing groove can be adjusted through the bearing blocks. And the drilling columns in one-to-one correspondence with the bearing blocks are arranged on the driving structure, drilling treatment can be conducted on the multiple track link sections at the same time, and then the drilling efficiency of the track link sections is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chain track segment processing, in particular to a tool for drilling connecting holes of chain track segments and chain plates. Background Art

[0002] Excavator track links are crucial components of excavators, with holes drilled into their sides to serve as connecting holes for pins. Patent application number 202122832314.6, for example, discloses a drilling device for track link production. While this device addresses the issue of drill bit chipping, it also suffers from issues such as an inability to drill multiple track links simultaneously, limited versatility, the inability to recycle drilling fluid, and poor track link stability during drilling.

[0003] Based on this, the applicant proposed a tool for drilling connecting holes of track links and chain plates. Utility Model Content

[0004] The purpose of the utility model is to overcome the problems of the existing track link and chain plate connection hole drilling tooling that cannot drill multiple track links at the same time, has low versatility, cannot recycle drilling fluid, and has poor stability of the track links during the drilling process, and to provide a track link and chain plate connection hole drilling tooling that has a reasonable structural design, can drill multiple track links at the same time, has good versatility, can recycle drilling fluid, and has good stability of the track links during the drilling process.

[0005] The technical solution adopted by the utility model to solve the technical problem is:

[0006] A tool for drilling holes in connecting holes of a track link and a chain plate, comprising a liquid storage tank, a bearing structure, and a drilling structure. A positioning block is provided on the top of the liquid storage tank, a column and an infusion structure are provided on the positioning block, a top plate is provided on the top of the column, and a pushing structure is provided on the top plate. The bearing structure comprises a bearing seat and a bearing block, the bearing seat is movably arranged between the positioning blocks, and a positioning groove is provided on the top of the bearing seat, the bearing block is placed in the positioning groove, and a bearing groove is provided on the bearing block. The track link that needs to be drilled is placed in the bearing groove, which can position the track link during the drilling process, avoid shaking of the track link during the drilling process, and enhance the drilling of the track link. Quality, the drilling structure includes an adjustment frame and a drilling column, the adjustment frame is connected to the pushing structure, and a driving structure is provided on the adjustment frame, the drilling column is movably connected to the driving structure, and the drilling column and the bearing block are set as a one-to-one corresponding mechanism, the adjustment frame moves vertically under the action of the pushing structure, driving the driving structure and the drilling column to rise or fall, the driving structure provides power for the rotation of the drilling column, so that the drilling column in the rotating process drills the chain track segment in the bearing groove, a plurality of bearing blocks are provided on the bearing seat, and a plurality of drilling columns corresponding to the bearing blocks are provided on the driving structure, which can drill a plurality of chain track segments at the same time, thereby improving the drilling efficiency of the chain track segments.

[0007] Preferably, a fixing groove is provided on the side wall of the positioning block, and fixing rods are provided on both sides of the bearing seat, and auxiliary wheels are provided on the fixing rods, and the auxiliary wheels are placed in the fixing grooves. The bearing block and the positioning groove are connected by threads, and the bearing block is set to a structure that can be replaced in the positioning groove. The auxiliary wheels on the fixing rods on both sides of the bearing seat are placed in the fixing grooves, which makes it easy to push the bearing seat to drive the bearing block to rotate between the positioning block and the positioning block, so that the bearing block drives the chain track segment to move to the bottom of the drilling column, which is convenient for the drilling column to drill the drilling position of the chain track segment. According to the chain track segments of different specifications, the bearing block with the corresponding bearing groove is selected, which can not only improve the chain track The stability of the section in the bearing groove can also improve the versatility of the chain track section drilling tooling and reduce the cost of manufacturing multiple sets of drilling tooling. By rotating the position of the bearing block in the positioning groove, the position of the chain track section can be adjusted, so that the drilling position on the chain track section is accurately moved to just below the drilling column, thereby improving the accuracy of the drilling position and enhancing the drilling quality of the chain track section. In order to prevent the auxiliary wheel from rolling back and forth in the fixed groove during the drilling process of the chain track section, a limiting groove can be provided at the bottom of the fixed groove, so that after the drilling position of the chain track section is moved to just below the drilling column, the auxiliary wheel rolls into the limiting groove to limit the auxiliary wheel, thereby preventing the auxiliary wheel from rocking back and forth in the fixed groove and affecting the drilling quality of the chain track section.

[0008] Preferably, an inner cavity is provided in the bearing seat, a liquid inlet groove connected to the inner cavity is provided on the top of the bearing seat, and a liquid discharge pipe connected to the inner cavity is provided at the bottom of the bearing seat. The liquid infusion structure sprays lubricating liquid during the drilling process of the chain track segment, thereby reducing the difficulty of drilling the chain track segment. The used lubricating liquid flows into the inner cavity through the liquid inlet groove and flows back to the liquid storage tank through the liquid discharge pipe, so that the lubricating liquid can be recycled and the utilization efficiency of the lubricating liquid is improved.

[0009] Preferably, a transverse filter plate is provided in the inner cavity of the bearing seat, a push-pull plate is provided at one end of the filter plate, and the filter plate is arranged to be a structure that can enter and exit the inner cavity through the push-pull plate. The lubricating fluid entering the inner cavity can be filtered through the filter plate to prevent impurities generated by drilling holes in the chain track segments from flowing into the liquid storage tank, thereby improving the purity of the lubricating fluid and preventing impurities from damaging the infusion structure.

[0010] Preferably, the infusion structure includes an infusion pump, which is arranged on the outer wall of the positioning block. A suction tube and an infusion tube are provided on the infusion pump, and the suction tube is connected to the liquid storage tank. A nozzle is provided on the infusion tube. A fixed block is provided at the bottom of the adjustment frame, and the infusion tube passes through the fixed block. The infusion pump draws out the lubricating liquid in the liquid storage tank through the suction tube, and sprays it onto the surface of the chain track segment through the infusion tube and the nozzle on the infusion tube, thereby reducing the difficulty of drilling the chain track segment and improving the drilling efficiency of the chain track segment.

[0011] Preferably, the pushing structure includes a hydraulic cylinder, which is arranged on the top plate. A piston rod is provided on the hydraulic cylinder, and the piston rod is connected to the adjustment frame. The hydraulic cylinder and the piston rod drive the vertical movement of the adjustment frame, driving the driving structure and the drilling column to rise or fall, so that the drilling column drills the chain track segment.

[0012] Preferably, the inner wall of the adjustment frame is provided with a bearing 1, the bottom of the adjustment frame is provided with a bearing 2, the driving structure includes a motor and a rotating shaft, the motor is provided on the outer wall of the adjustment frame, a transmission shaft is provided on the motor, one end of the transmission shaft is inserted into the bearing 1, and a bevel gear 1 is provided on the transmission shaft, the rotating shaft vertically passes through the bearing 2, and a bevel gear 2 meshing with the bevel gear 1 is provided at the top of the rotating shaft, a mounting block is provided on the drilling column, and the mounting block is installed at the bottom end of the rotating shaft, the motor drives the transmission shaft and the bevel gear 1 on the transmission shaft to rotate, the gear 1 drives the bevel gear 2 and the rotating shaft to rotate, the rotating shaft drives the drilling column to rotate, and combined with the action of the hydraulic cylinder, the drilling column is lowered during the rotation process, and the chain track section is drilled.

[0013] Preferably, a pressing structure is provided at the bottom of the adjustment frame, and the drilling column is arranged as a structure that can be replaced on the rotating shaft through the mounting block. The pressing structure can press the track segment from above the track segment to prevent the track segment from shaking up and down during the drilling process, thereby improving the stability of the track segment and enhancing the drilling quality of the track segment. The mounting block on the drilling column is connected to the rotating shaft through a threaded connection to facilitate the installation or disassembly of the mounting block on the rotating shaft. According to different drilling requirements of the track segment, the corresponding drilling column is selected, which can not only improve the drilling quality of the track segment, but also further improve the versatility of the track segment drilling tooling.

[0014] Preferably, the pressing structure includes a fixed cylinder and a pressure plate, the top of the fixed cylinder is arranged at the bottom of the adjustment frame, and the pressure plate is provided with a connecting column, the top of the connecting column is inserted into the fixed cylinder, and a spring is provided between the top of the fixed cylinder and the connecting column. When drilling the chain track segment, the adjustment frame moves downward under the action of the hydraulic cylinder, and the adjustment frame drives the fixed cylinder and the pressure plate to descend, so that the pressure plate first contacts the chain track segment, and the pressure plate presses the chain track segment. The adjustment frame continues to descend, and the drilling column contacts the chain track segment, and the chain track segment is drilled, which squeezes the spring in the fixed cylinder, and the compressed spring pushes the connecting column and the pressure plate downward. The pressure plate fully presses the track segment to enhance the stability of the track segment. After the drilling of the track segment is completed, the adjustment frame rises under the action of the hydraulic cylinder, the drilling column and the track segment are separated first, and the pressure plate presses the track segment to prevent the track segment from rising with the rising drilling column. After the drilling column and the track segment are completely separated, the pressure plate rises with the adjustment frame to separate the pressure plate from the track segment. In order to further improve the stability of the track segment during the drilling process, fixed cylinders can also be provided at the bottom of the adjustment frame on both sides of the drilling column, so that the pressure plate presses the track segment from both sides of the drilling position, thereby improving the stability of the track segment during the drilling process and enhancing the drilling quality of the track segment.

[0015] Beneficial effects:

[0016] 1. The adjustment frame moves vertically under the action of the pushing structure, driving the driving structure and the drilling column to rise or fall. The driving structure provides power for the rotation of the drilling column, so that the drilling column drills the chain track segments in the bearing groove during the rotation. A plurality of bearing blocks are provided on the bearing seat, and a plurality of drilling columns corresponding to the bearing blocks are provided on the driving structure. Multiple chain track segments can be drilled simultaneously, thereby improving the drilling efficiency of the chain track segments.

[0017] 2. An inner cavity is provided in the bearing seat, a liquid inlet groove communicating with the inner cavity is provided at the top of the bearing seat, and a liquid discharge pipe communicating with the inner cavity is provided at the bottom of the bearing seat. The liquid infusion structure sprays lubricating liquid during the drilling process of the track segment, thereby reducing the drilling difficulty of the track segment. The used lubricating liquid flows into the inner cavity through the liquid inlet groove and returns to the liquid storage tank through the liquid discharge pipe, so that the lubricating liquid can be recycled and the utilization efficiency of the lubricating liquid is improved.

[0018] 3. The adjusting frame moves downward under the action of the hydraulic cylinder, and the adjusting frame drives the fixed cylinder and the pressure plate to descend, so that the pressure plate first contacts the chain track segment, and the pressure plate presses the chain track segment. The adjusting frame continues to descend, and the drilling column contacts the chain track segment, and the chain track segment is drilled, and the spring in the fixed cylinder is squeezed. The compressed spring pushes the connecting column and the pressure plate downward, so that the pressure plate fully presses the chain track segment and enhances the stability of the chain track segment. After the drilling of the chain track segment is completed, the adjusting frame rises under the action of the hydraulic cylinder, and the drilling column and the chain track segment are separated first, and the pressure plate presses the chain track segment to prevent the chain track segment from rising with the rising drilling column. After the drilling column and the chain track segment are completely separated, the pressure plate rises with the adjusting frame to separate the pressure plate from the chain track segment, making it convenient for the staff to take out the drilled chain track segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural diagram of the present utility model.

[0020] Figure 2 It is a partial structural diagram of the utility model, illustrating the connection structure between the bearing seat and the bearing block.

[0021] Figure 3 It is a partial structural diagram of the utility model, illustrating the connection structure between the bearing block and the push-pull plate.

[0022] Figure 4 It is a partial structural diagram of the utility model, illustrating the connection structure between the transmission shaft and the rotating shaft.

[0023] Figure 5 It is a partial structural diagram of the utility model, illustrating the connection structure between the fixing cylinder and the connecting column.

[0024] Figure 6 This is another structural diagram of the present invention.

[0025] In the figure: 1. liquid storage tank, 2. positioning block, 3. column, 4. top plate, 5. fixing groove, 6. infusion pump, 7. suction tube, 8. infusion tube, 9. nozzle, 10. bearing seat, 11. bearing block, 12. fixing rod, 13. positioning groove, 14. liquid inlet tank, 15. inner cavity, 16. discharge pipe, 17. push-pull plate, 18. auxiliary wheel, 19. filter plate, 20. bearing groove, 21. hydraulic cylinder, 22. adjustment frame, 23. motor, 24. rotating shaft, 25. drilling column, 26. piston rod, 27. bearing 1, 28. bearing 2, 29. fixing block, 30. fixing cylinder, 31. transmission shaft, 32. bevel gear 1, 33. bevel gear 2, 34. mounting block, 35. connecting column, 36. pressure plate, 37. spring, 38. anti-slip pad. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0028] Example 1:

[0029] As attached Figure 1-5As shown, a tool for drilling holes in the connection holes of a chain track link and chain plate comprises a liquid storage tank 1, a bearing structure, and a drilling structure. A positioning block 2 is provided on the top of the liquid storage tank 1, a column 3 and an infusion structure are provided on the positioning block 2, a top plate 4 is provided on the top of the column 3, and a pushing structure is provided on the top plate 4. The bearing structure comprises a bearing seat 10 and a bearing block 11. The bearing seat 10 is movably arranged between the positioning block 2 and the positioning block 2, and a positioning groove 13 is provided on the top of the bearing seat 10. The bearing block 11 is placed in the positioning groove 13, and a bearing groove 20 is provided on the bearing block 11. The drilling structure comprises an adjustment frame 22 and a drilling column 25. The adjustment frame 22 is connected to the pushing structure, and a driving structure is provided on the adjustment frame 22. The drilling column 25 is movably connected to the driving structure, and the drilling column 25 is provided with a one-to-one correspondence with the bearing block 11, a fixing groove 5 is provided on the side wall of the positioning block 2, and a fixing rod 12 is provided on both sides of the bearing seat 10. An auxiliary wheel 18 is provided on the fixing rod 12, and the auxiliary wheel 18 is placed in the fixing groove 5. The bearing block 11 and the positioning groove 13 are connected by a thread, and the bearing block 11 is provided with a structure that can be replaced in the positioning groove 13. An inner cavity 15 is provided in the bearing seat 10, and a liquid inlet groove 14 communicating with the inner cavity 15 is provided at the top of the bearing seat 10, and a drain pipe 16 communicating with the inner cavity 15 is provided at the bottom of the bearing seat 10. A horizontal filter plate 19 is provided in the inner cavity 15 of the bearing seat 10, and a push-pull plate 17 is provided at one end of the filter plate 19, and the filter plate 19 is provided with a structure that can enter and exit the inner cavity 15 through the push-pull plate 17.

[0030] Among them, the infusion structure includes an infusion pump 6, which is arranged on the outer wall of the positioning block 2, and is provided with a suction tube 7 and an infusion tube 8 on the infusion pump 6, connecting the suction tube 7 with the liquid storage tank 1, and a nozzle 9 is provided on the infusion tube 8. A fixed block 29 is provided at the bottom of the adjustment frame 22, and the infusion tube 8 passes through the fixed block 29.

[0031] The pushing structure includes a hydraulic cylinder 21 , which is disposed on the top plate 4 . A piston rod 26 is disposed on the hydraulic cylinder 21 , and the piston rod 26 is connected to the adjustment frame 22 .

[0032] Among them, the inner wall of the adjustment frame 22 is provided with a bearing 27, and the bottom of the adjustment frame 22 is provided with a bearing 28. The driving structure includes a motor 23 and a rotating shaft 24. The motor 23 is provided on the outer wall of the adjustment frame 22. A transmission shaft 31 is provided on the motor 23. One end of the transmission shaft 31 is inserted into the bearing 27, and a bevel gear 32 is provided on the transmission shaft 31. The rotating shaft 24 vertically passes through the bearing 28. A bevel gear 2 33 engaged with the bevel gear 32 is provided at the top of the rotating shaft 24. A mounting block 34 is provided on the drilling column 25, and the mounting block 34 is installed at the bottom end of the rotating shaft 24.

[0033] Among them, a pressing structure is provided at the bottom of the adjustment frame 22, and the drilling column 25 is set as a structure that can be replaced on the rotating shaft 24 through the mounting block 34. The pressing structure includes a fixed cylinder 30 and a pressing plate 36. The top of the fixed cylinder 30 is set at the bottom of the adjustment frame 22, and a connecting column 35 is provided on the pressing plate 36. The top of the connecting column 35 is inserted into the fixed cylinder 30, and a spring 37 is provided between the top of the fixed cylinder 30 and the connecting column 35.

[0034] Example 2:

[0035] Further explanation will be given based on the first embodiment. Figure 6 As shown, the surface of the pressure plate 36 is provided with an anti-skid pad 38. The anti-skid pad 38 can increase the friction between the pressure plate 36 and the track link, so that the pressure plate 36 presses the track link to prevent the track link from sliding during the drilling process, thereby improving the stability of the track link during the drilling process and enhancing the drilling quality of the track link.

[0036] Working principle: according to the specifications of the track segment and the drilling requirements that need to be drilled, select the bearing block 11 and the drilling column 25 with the corresponding bearing groove 20, install the bearing block 11 in the positioning groove 13, install the mounting block 34 on the drilling column 25 on the rotating shaft 24, put the track segment into the bearing groove 20, push the bearing seat 10 to move, and move the drilling position of the track segment to just below the drilling column 25, start the infusion pump 6, and the infusion pump 6 draws the lubricating liquid in the reservoir 1 through the suction tube 7, and sprays it onto the surface of the track segment through the infusion tube 8 and the nozzle 9 on the infusion tube 8, start the motor 23, the motor 23 drives the transmission shaft 31 and the bevel gear 1 32 on the transmission shaft 31 to rotate, the gear 1 drives the bevel gear 2 33 and the rotating shaft 24 to rotate, the rotating shaft 24 drives the drilling column 25 to rotate, start the hydraulic cylinder 21, and the adjustment frame 22 moves downward under the action of the hydraulic cylinder 21, and the adjustment frame 22 drives the fixed cylinder 30 and the pressure plate 36 to descend, so that the pressure plate 36 first contacts the chain track segment, the pressure plate 36 presses the chain track segment, the adjustment frame 22 continues to descend, the drilling column 25 contacts the chain track segment, and the chain track segment is drilled; the spring 37 in the fixing cylinder 30 is squeezed, and the compressed spring 37 pushes the connecting column 35 and the pressure plate 36 downward, so that the pressure plate 36 fully presses the chain track segment. After the chain track segment drilling is completed, the adjustment frame 22 rises under the action of the hydraulic cylinder 21, and the drilling column 25 is separated from the chain track segment first. The pressure plate 36 suppresses the chain track segment to prevent the chain track segment from rising with the rising drilling column 25. After the drilling column 25 is completely separated from the chain track segment, the pressure plate 36 rises with the adjustment frame 22 to separate the pressure plate 36 from the chain track segment, pushing the bearing seat 10 to move, and moving the drilled chain track segment out from directly under the drilling column 25. The undrilled chain track segment is moved to directly under the drilling column 25 for drilling. After the drilled chain track segment is taken out, a new chain track segment is placed in to continue drilling.

[0037] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0038] The parts not involved in the present invention are the same as the existing technology or can be implemented by using the existing technology.

Claims

1. A tool for drilling connecting holes of track links and chain plates, comprising a liquid storage tank, a bearing structure, and a drilling structure, characterized in that: A positioning block is provided on the top of the liquid storage tank, a column and an infusion structure are provided on the positioning block, a top plate is provided on the top of the column, and a pushing structure is provided on the top plate. The bearing structure includes a bearing seat and a bearing block. The bearing seat is movably arranged between the positioning block and the positioning block, and a positioning groove is provided on the top of the bearing seat. The bearing block is placed in the positioning groove, and a bearing groove is provided on the bearing block. The drilling structure includes an adjustment frame and a drilling column. The adjustment frame is connected to the pushing structure, and a driving structure is provided on the adjustment frame. The drilling column is movably connected to the driving structure, and the drilling column and the bearing block are set as a one-to-one corresponding mechanism.

2. The track link and chain plate connecting hole drilling tool according to claim 1, characterized in that: A fixing groove is provided on the side wall of the positioning block, and fixing rods are provided on both sides of the bearing seat. Auxiliary wheels are provided on the fixing rods, and the auxiliary wheels are placed in the fixing grooves. The bearing block is connected to the positioning groove by a threaded connection, and the bearing block is set as a structure that can be replaced in the positioning groove.

3. The track link and chain plate connecting hole drilling tool according to claim 1 or 2, characterized in that: An inner cavity is provided in the bearing seat, a liquid inlet groove communicating with the inner cavity is provided on the top of the bearing seat, and a liquid discharge pipe communicating with the inner cavity is provided on the bottom of the bearing seat.

4. The track link and chain plate connecting hole drilling tool according to claim 3, characterized in that: A transverse filter plate is arranged in the inner cavity of the bearing seat, a push-pull plate is arranged at one end of the filter plate, and the filter plate is arranged to be able to enter and exit the inner cavity through the push-pull plate.

5. The track link and plate connecting hole drilling tool according to claim 1, characterized in that: The infusion structure includes an infusion pump, which is arranged on the outer wall of the positioning block. A suction tube and an infusion tube are provided on the infusion pump. The suction tube is connected to the liquid storage tank, and a nozzle is provided on the infusion tube. A fixed block is provided at the bottom of the adjustment frame, and the infusion tube passes through the fixed block.

6. The track link and plate connecting hole drilling tool according to claim 1, characterized in that: The pushing structure comprises a hydraulic cylinder, which is arranged on the top plate. A piston rod is arranged on the hydraulic cylinder, and the piston rod is connected to the adjustment frame.

7. The track link and chain plate connecting hole drilling tool according to claim 1, characterized in that: The inner wall of the adjustment frame is provided with bearing 1, and the bottom of the adjustment frame is provided with bearing 2. The driving structure includes a motor and a rotating shaft. The motor is provided on the outer wall of the adjustment frame, and a transmission shaft is provided on the motor. One end of the transmission shaft is inserted into bearing 1, and a bevel gear 1 is provided on the transmission shaft. The rotating shaft vertically passes through bearing 2, and a bevel gear 2 engaged with bevel gear 1 is provided at the top of the rotating shaft; a mounting block is provided on the drilling column, and the mounting block is installed at the bottom end of the rotating shaft.

8. The tool for drilling the connecting holes of the track link and chain plate according to claim 7, characterized in that: The bottom of the adjustment frame is provided with a pressing structure, and the drilling column is provided as a structure that can be replaced on the rotating shaft through a mounting block.

9. The track link and chain plate connecting hole drilling tool according to claim 8, characterized in that: The pressing structure includes a fixed cylinder and a pressing plate. The top of the fixed cylinder is arranged on the bottom of the adjustment frame. A connecting column is arranged on the pressing plate. The top of the connecting column is inserted into the fixed cylinder, and a spring is arranged between the top of the fixed cylinder and the connecting column.

Images