A mine semi-automatic drill jumbo

Abstract

The present application relates to a kind of mining semi-automatic rock drilling jumbo, including vehicle body, drive assembly and vehicle-mounted hydraulic system being installed on vehicle body, fixedly arranged in the driving module of the vehicle body one side, detachably installed in the multi-stage telescopic arm of the driving module one side and by the vehicle-mounted hydraulic system control, rock drilling mechanism being installed on the multi-stage telescopic arm;Adopt one person driving one person remote control operation mode, two staff cooperate, reasonably control the distance and speed of rock drilling, and can find deviation in rock drilling process in time, and the present application is inserted into rock hole when drill bit cooling, make rock drilling mechanism keep stable posture, not because the vibration of equipment leads to deviation, facilitate drill bit and anchor rod are inserted into the same rock hole again continue operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rock drilling jumbo, in particular to a mine semi-automatic rock drilling jumbo. BACKGROUND

[0002] When the rock drilling jumbo is operated by one person, the operator needs to simultaneously consider equipment driving, rock drilling parameter adjustment and deviation monitoring and other tasks, and the dispersion of energy easily leads to inaccurate rock drilling distance control, speed adjustment lag, and difficulty in discovering the deviation in the rock drilling process in real time. Once the drilling hole deviates, the equipment needs to be re-adjusted, and the rock hole may be scrapped, which seriously affects the operation efficiency. In the two-person cooperation mode, the two workers need to cooperate in the same operation space, and the communication and coordination are delayed due to the limitation of the equipment operation area, so that the accurate control of the rock drilling distance and speed cannot be efficiently realized, and the timeliness of deviation discovery and correction is poor.

[0003] Secondly, in the rock drilling operation process, the drill bit generates a large amount of heat due to continuous friction with the rock, and needs to be cooled down regularly. The existing rock drilling jumbo lacks an effective posture stabilizing mechanism during the drill bit cooling stage: the vibration generated by the equipment itself during operation easily leads to the deviation of the rock drilling mechanism, so that the cooled drill bit is difficult to accurately align with the original rock hole. If the operation needs to continue, the rock hole position needs to be repositioned, which not only increases the operation steps, but also may cause the anchor rod to fail to be smoothly inserted into the original rock hole due to the second positioning error, further prolonging the operation cycle, and even causing additional damage to the rock mass structure, affecting the safety and stability of the subsequent supporting operation. SUMMARY

[0004] In order to solve the above problems existing in the prior art, the present application aims to provide a mine semi-automatic rock drilling jumbo.

[0005] The technical scheme adopted by the present application is as follows:

[0006] A mine semi-automatic rock drilling jumbo, comprising a vehicle body, a driving assembly and a vehicle-mounted hydraulic system mounted on the vehicle body, a driving module fixedly arranged on one side of the vehicle body, a multi-stage telescopic arm detachably mounted on one side of the driving module and controlled by the vehicle-mounted hydraulic system, and a rock drilling mechanism mounted on the multi-stage telescopic arm.

[0007] The rock drilling mechanism comprises a bearing rail connected with the multi-stage telescopic arm, a mounting seat slidingly arranged on the bearing rail, a driving motor detachably mounted on the mounting seat, an anchor rod connected with the output shaft of the driving motor through a shaft coupling, a drill bit fixedly arranged at the end of the anchor rod away from the driving motor, and a positioning assembly mounted between the drill bit and the anchor rod.

[0008] The positioning assembly comprises a moving sleeve sleeved on the side of the anchor rod, a sliding sleeve slidingly arranged in the moving sleeve, and a plurality of positioning plates connected with the sliding sleeve through a rotating rod; the sliding sleeve is controlled to slide relative to the moving sleeve by the action of the drill bit being pulled out from the rock hole, the sliding sleeve drives the positioning plates to gather through the rotating rod, the positioning assembly is driven to insert into the rock hole, and the rock drilling mechanism is kept in a stable posture by the positioning assembly when the drill bit is cooled, and the rock drilling mechanism is assisted to insert into the rock hole again.

[0009] As a preferred embodiment of the present application, the rock drilling mechanism further comprises a fixed pulley rotatably arranged at one end of the bearing rail, the fixed pulley is located on the side of the bearing rail close to the mounting seat, a plurality of steel ropes are arranged between the mounting seat and the fixed pulley, the mounting seat is controlled to move relative to the bearing rail by driving the winch to rotate through the vehicle-mounted hydraulic system, and the feeding of the anchor rod in the rock drilling process is realized.

[0010] As a preferred embodiment of the present application, a fixed frame is fixedly arranged at the end of the bearing rail away from the fixed pulley, a sliding seat is connected with the bearing rail through a control cylinder, and the fixed frame and the sliding seat are used for bearing the anchor rod, and a wire harness clamp is fixedly arranged on one side of the bearing rail.

[0011] As a preferred embodiment of the present application, the positioning assembly further comprises a fixed plate fixedly connected with the fixed frame, a positioning cylinder is arranged on the side of the fixed plate away from the fixed frame, a cylinder barrel of the positioning cylinder is fixedly connected with the fixed plate, and a piston rod of the positioning cylinder is connected with the moving sleeve.

[0012] As a preferred embodiment of the present application, the positioning plate comprises an integral insertion hole part and clamping part, and a connecting rod is fixedly arranged at one end of the clamping part and hinged with one end of the rotating rod, the insertion hole part is used for inserting into the rock hole, the clamping part is used for clamping the drill bit, and the insertion hole part and the clamping part realize the positioning of the drill bit after the drill bit is separated from the rock hole.

[0013] As a preferred embodiment of the present application, the moving sleeve comprises a sleeve main body sleeved on the side of the anchor rod, a mounting flange fixedly arranged at one end of the sleeve main body and connected with the piston rod of the positioning cylinder, and a sliding groove arranged on the side of the sleeve main body and used for supporting the sliding of the sliding sleeve.

[0014] As a preferred embodiment of the present application, the moving sleeve further comprises a fixed rod fixedly arranged at one end of the sleeve main body away from the mounting flange, a fixed ring fixedly arranged at one end of the fixed rod away from the mounting flange, and a through hole arranged on the fixed ring and slidingly connected with the connecting rod; the connecting rod penetrates through the through hole.

[0015] As the preferred of the present application, the sliding sleeve comprises a plurality of clamping parts connected with the sliding groove, a connecting part for connecting the plurality of clamping parts and located inside the sleeve body, and an extension part fixedly arranged on the clamping part and hinged with the rotating rod away from the connecting rod.

[0016] As the preferred of the present application, the sliding sleeve is internally provided with a rubber gasket, the outer side of the rubber gasket is provided with a positioning groove, the inner wall of the sliding sleeve is provided with a mounting groove, a snap ring is arranged between the mounting groove and the positioning groove, the mounting groove, the positioning groove and the snap ring are matched, the inner wall of the rubber gasket forms a friction part, and the shape of the friction part is matched with the shape of the drill bit.

[0017] As the preferred of the present application, the moving sleeve is provided with a spring ring on the side, and one grommet is fixedly arranged at each end of the spring ring, and the two grommets are respectively abutted with the extension part and the mounting flange.

[0018] The present application has the advantages that: as a mine semi-automatic rock drilling jumbo, the present application adopts the operation mode of one person driving and one person remotely controlling, two workers cooperate, reasonably control the drilling distance and speed, and can timely find the deviation in the drilling process, and when the drill bit is cooled, the positioning assembly is inserted into the rock hole, so that the rock drilling mechanism maintains a stable posture and does not deviate due to the vibration of the equipment, and the drill bit and the anchor rod can be conveniently inserted into the same rock hole again for continuous operation. BRIEF DESCRIPTION OF DRAWINGS

[0019] The present application will be further described in detail below in combination with the drawings and specific implementation methods.

[0020] Figure 1 is a structural schematic diagram of the present application (the rock drill is not installed);

[0021] Figure 2 is a structural schematic diagram of the present application Figure 1 ;

[0022] Figure 3 is a structural schematic diagram of the present application Figure 2 ;

[0023] Figure 4 is a structural schematic diagram of the present application Figure 3 ;

[0024] Figure 5 is a structural schematic diagram of the present application Figure 4 ; PARTICULAR EMBODIMENTS

[0025] In order to further illustrate the technical means adopted by the present application and the effects achieved by the present application in realizing the predetermined object of the present application, the specific embodiments, structures, features and effects thereof according to the present application are described in detail below in combination with the drawings and preferred embodiments.

[0026] In combination Figures 1-5 A mine semi-automatic drilling jumbo comprises a vehicle body 11, a driving assembly 12 and a vehicle-mounted hydraulic system 13 installed on the vehicle body 11, a driving module 14 fixedly arranged on one side of the vehicle body 11, a multi-stage telescopic arm 15 detachably installed on one side of the driving module 14 and controlled by the vehicle-mounted hydraulic system 13, and a drilling mechanism 16 installed on the multi-stage telescopic arm 15. One staff drives from inside the driving module 14 to drive the vehicle body 11 to a construction area, and another staff carries an operation box to remotely control the jumbo from behind the shelter. The two staffs cooperate to reasonably control the drilling distance and speed and can timely find the deviation in the drilling process.

[0027] The drilling mechanism 16 comprises a bearing rail 18 connected with the multi-stage telescopic arm 15, a mounting seat 20 slidingly arranged on the bearing rail 18, a driving motor 24 detachably installed on the mounting seat 20, an anchor rod 25 connected with an output shaft of the driving motor 24 through a shaft coupling, a drill bit 27 fixedly arranged at an end of the anchor rod 25 away from the driving motor 24, and a positioning assembly 26 installed between the drill bit 27 and the anchor rod 25. The multi-stage telescopic arm 15 can be controlled to move the bearing rail 18 to a specified working position through the telescoping and angle adjustment between the sections. The drilling machine comprises a rotating part controlled by the driving motor 24, an impact part controlled by a winch, and a side water injection system. The rotating part is used to drive a gear transmission box to increase the torque and reduce the rotation speed of the hydraulic motor on the drill bit. The impact part is responsible for energy conversion, and the output energy is transmitted to the rock through the anchor rod and the drill bit to achieve the purpose of breaking the rock. The side water injection system is used to provide cooling and lubrication during the drilling process to ensure the efficient operation of the drilling machine.

[0028] The positioning assembly 26 comprises a moving sleeve 34 sleeved on the side of the anchor rod 25, a sliding sleeve 33 slidingly arranged in the moving sleeve 34, a plurality of positioning plates 32 connected with the sliding sleeve 33 through a rotating rod 28; the sliding sleeve 33 is driven to slide relative to the moving sleeve 34 by the action of the drill bit 27 pulled out from the rock hole, the sliding sleeve 33 drives the positioning plates 32 to gather through the rotating rod 28, and the positioning assembly 26 is driven to insert into the rock hole, the rock drilling mechanism 16 is kept in a stable posture by the positioning assembly 26 when the drill bit 27 is cooled, and the rock drilling mechanism 16 is assisted to insert into the rock hole again. The positioning assembly 26 is inserted into the rock hole when the drill bit 27 is cooled, so that the rock drilling mechanism 16 will not deviate due to vibration of the equipment, the accuracy of subsequent operation on the same rock hole is improved, the time for repeated positioning is reduced, and the work efficiency is improved.

[0029] Beneficially, the rock drilling mechanism 16 further comprises a fixed pulley 21 rotatably arranged at one end of the bearing rail 18, the fixed pulley 21 is located on the side of the bearing rail 18 close to the mounting seat 20, the mounting seat 20 and the fixed pulley 21 are connected through a plurality of steel ropes, the mounting seat 20 is driven to move relative to the bearing rail 18 by driving the winch to rotate through the vehicle-mounted hydraulic system 13, and feeding of the anchor rod 25 in the rock drilling process is realized. The winch can realize forward movement and backward movement of the mounting seat 20 through the plurality of steel ropes controlled by winding.

[0030] Beneficially, the bearing rail 18 is fixedly provided with a fixed frame 17 at the end away from the fixed pulley 21, the sliding seat 23 is connected with the bearing rail 18 through a control cylinder 22, the fixed frame 17 and the sliding seat 23 are used for bearing the anchor rod 25, and a wire harness clamp 19 is fixedly arranged on one side of the bearing rail 18. The center of the fixed frame 17 and the center of the sliding seat 23 are both provided with bearing rings, and the bearing rings allow the anchor rod 25 and the drill bit 27 to rotate and slide relative to the fixed frame 17 and the sliding seat 23.

[0031] Beneficially, the positioning assembly 26 further comprises a fixed plate 31 fixedly connected with the fixed frame 17, the fixed plate 31 is provided with a positioning cylinder 29 away from the fixed frame 17, a cylinder barrel of the positioning cylinder 29 is fixedly connected with the fixed plate 31, and a piston rod of the positioning cylinder 29 is connected with the moving sleeve 34. The positioning cylinder 29 is driven by the vehicle-mounted hydraulic system, can be cooperated with the winch, and can form accurate linkage with movement of the anchor rod 25 during feeding and backward movement.

[0032] Beneficially, the positioning plate 32 comprises an integral insertion part 37 and clamping part 38, a connecting rod 36 fixedly arranged at one end of the clamping part 38 and hinged to one end of the rotating rod 28, the insertion part 37 is used for inserting into the rock hole, the clamping part 38 is used for clamping the drill bit 27, and the insertion part 37 and the clamping part 38 realize the positioning of the drill bit 27 after being separated from the rock hole. The inner side of the clamping part 38 is shaped to match the outer wall of the drill bit 27, and the inner and outer sides of the insertion part 37 are smooth, which can cooperate with the inner wall of the rock hole.

[0033] Beneficially, the moving sleeve 34 comprises a sleeve body 44 sleeved on the side of the anchor rod 25, a mounting flange 43 fixedly arranged at one end of the sleeve body 44 and connected to the piston rod of the positioning cylinder 29, and a sliding groove 42 opened on the side of the sleeve body 44 and used for supporting the sliding of the sliding sleeve 33. The sliding groove 42 is hollowly formed in the side wall of the sleeve body 44, and when the moving sleeve 34 and the sliding sleeve 33 are not allowed to slide relative to each other, the positioning cylinder 29 drives them to move synchronously.

[0034] Beneficially, the moving sleeve 34 further comprises a fixed rod 41 fixedly arranged at one end of the sleeve body 44 away from the mounting flange 43, a fixed ring 39 fixedly arranged at one end of the fixed rod 41 away from the mounting flange 43, and a through hole 40 arranged on the fixed ring 39 and in sliding connection with the connecting rod 36; the connecting rod 36 penetrates through the through hole 40. The through hole 40 allows the positioning plate 32 to move only radially.

[0035] Beneficially, the sliding sleeve 33 comprises a plurality of clamping parts 47 in sliding connection with the sliding groove 42, a connecting part 45 for connecting the plurality of clamping parts 47 and located inside the sleeve body 44, and an extension part 46 fixedly arranged on the clamping part 47 and hinged to one end of the rotating rod 28 away from the connecting rod 36. The connecting part 45 allows the plurality of clamping parts 47 to move synchronously, and through the transmission of the rotating rod 28, the plurality of positioning plates 32 can be driven to move synchronously.

[0036] Beneficially, the sliding sleeve 33 is provided with a rubber washer 35, the outer side of the rubber washer 35 is provided with a positioning groove 49, the inner wall of the sliding sleeve 33 is provided with a mounting groove 48, the mounting groove 48 and the positioning groove 49 are provided with a snap ring, the mounting groove 48, the positioning groove 49 and the snap ring cooperate, the inner wall of the rubber washer 35 forms a friction part 50, the shape of the friction part 50 is matched with the shape of the drill bit 27. The rubber washer 35 is a consumable material and needs to be replaced regularly after a certain period of use. The snap ring can make the rubber washer 35 and the sliding sleeve 33 move synchronously after being installed in the sliding sleeve 33, but does not affect the rotation of the rubber washer 35 relative to the sliding sleeve 33. The specifications, materials and structures of the anchor rod 25 and the drill bit 27 are different, and the friction force generated when the anchor rod 25 and the rubber washer 35 move relative to each other is not enough to overcome the elastic force of the spring ring 30, so the positioning plate 32 has a tendency to maintain a stable posture when it is diverging.

[0037] Beneficially, the moving sleeve 34 is provided with a spring ring 30 on the side, and the two ends of the spring ring 30 are respectively fixed with a washer, and the two washers are respectively in abutment with the extension 46 and the mounting flange 43. The spring ring 30 can make the positioning plate 32 diverge instantaneously after the positioning plate 32 leaves the rock hole, and can keep the positioning plate 32 in a diverging state during normal operation of the rock drill, without interfering with the normal operation of the anchor rod 25 and the drill bit 27.

[0038] The working principle of the present application is as follows:

[0039] The vehicle-mounted hydraulic system 13 is used to control the multi-stage telescopic arm 15 to start, adjust the rock drilling mechanism 16 to a suitable construction position, remotely control the driving motor 24 to start, the output shaft of the driving motor 24 controls the rotation of the anchor rod 25 and the drill bit 27, and the vehicle-mounted hydraulic system 13 controls the winch to wind the steel wire to make the mounting seat 20 and the driving motor 24 slide along the bearing rail 18, controls the feeding of the anchor rod 25 and the drill bit 27, and the drill bit 27 contacts the rock to start drilling.

[0040] The drill bit 27 stops working after a certain period of time, the vehicle-mounted hydraulic system 13 controls the winch to wind the steel wire to make the mounting seat 20 and the driving motor 24 slide along the bearing rail 18, so that the drill bit 27 and the anchor rod 25 retreat, and the drill bit 27 retreats to the fixed frame 17 position for cooling, which can be water cooling or other common cooling methods.

[0041] During the retraction of the drill bit 27, the anchor rod 25 and the drill bit 27 slide with the positioning assembly 26, and the anchor rod 25 and the drill bit 27 pass through the rubber washer 35 in turn. The friction between the anchor rod 25 and the rubber washer 35 is small, and does not change the state of the positioning assembly 26. When the drill bit 27 passes through the rubber washer 35, the drill bit 27 moves together with the rubber washer 35 under the action of the friction force. The sliding sleeve 33 moves together with the rubber washer 35 and slides relative to the moving sleeve 34. The spring ring 30 is compressed, the sliding sleeve 33 drives the plurality of positioning plates 32 to gather together through the rotating rod 28, and the plurality of positioning plates 32 cannot continue to gather together after the plurality of positioning plates 32 gather together to the clamping part 38 to clamp the drill bit 27. The drill bit 27 continues to retract, and the positioning cylinder 29 is on standby at this time. When the drill bit 27 leaves the rock hole, the positioning cylinder 29 controls the piston rod to extend, and drives the moving sleeve 34 and the positioning plates 32 in the gathering state to push out to the insertion hole part 37 and insert into the rock hole.

[0042] The drill bit 27 retracts to the fixed plate 31 and the mounting flange 43 to cool, and at this time, the positioning plates 32 are inserted into the rock hole, and the rock drilling mechanism 16 will not deviate due to the vibration of the equipment.

[0043] When the drill bit 27 works again, the vehicle-mounted hydraulic system 13 controls the winch to wind the steel rope to make the mounting seat 20 and the driving motor 24 slide along the bearing rail 18, and the anchor rod 25 and the drill bit 27 are fed. During this process, the positioning plates 32 are bound by the inner wall of the rock hole, and the movement of the drill bit 27 cannot change the state of the positioning assembly 26. When the drill bit 27 is inserted into the rock hole, the positioning cylinder 29 is started to control the piston rod to reset, drive the moving sleeve 34 and the positioning plates 32 in the gathering state to pull out, and when the positioning plates 32 leave the rock hole, the spring ring 30 resets to drive the sliding sleeve 33 to move relative to the moving sleeve 34, so that the plurality of positioning plates 32 diverge and remain in this state. At this time, the driving motor 24 is started, and the anchor rod 25 and the drill bit 27 are allowed to rotate normally again to perform the rock drilling work.

[0044] The above is only a preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as the above preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above disclosed technical content to obtain equivalent embodiments with equivalent changes, without departing from the technical solution of the present application. Any modification, change, modification and modification of the above embodiments according to the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A semi-automatic rock drilling rig for mining, characterized in that: It includes a vehicle body, a drive assembly and an on-board hydraulic system mounted on the vehicle body, a driving module fixedly mounted on one side of the vehicle body, a multi-stage telescopic boom detachably mounted on one side of the driving module and controlled by the on-board hydraulic system, and a rock drilling mechanism mounted on the multi-stage telescopic boom. The rock drilling mechanism includes a bearing rail connected to the multi-stage telescopic arm, a mounting base slidably disposed on the bearing rail, a drive motor detachably mounted on the mounting base, an anchor rod connected to the output shaft of the drive motor via a coupling, a drill bit fixedly disposed at the end of the anchor rod away from the drive motor, and a positioning assembly installed between the drill bit and the anchor rod. The positioning assembly includes a movable sleeve sleeved around the anchor bolt, a sliding sleeve slidably disposed inside the movable sleeve, and multiple positioning plates connected to the sliding sleeve via a rotating rod. The sliding sleeve is controlled to slide relative to the movable sleeve by the action of the drill bit being pulled out of the rock hole. After the sliding sleeve drives the positioning plates to converge via the rotating rod, it drives the positioning assembly to insert into the rock hole. When the drill bit cools down, the positioning assembly is used to maintain the rock drilling mechanism in a stable posture and assist the rock drilling mechanism in re-inserting into the rock hole.

2. The semi-automatic rock drilling rig for mining according to claim 1, characterized in that: The rock drilling mechanism also includes a fixed pulley rotatably mounted at one end of the bearing rail. The fixed pulley is located on the side of the bearing rail near the mounting base. The mounting base and the fixed pulley are connected by multiple steel cables. The winch is driven by the vehicle-mounted hydraulic system to rotate and control the movement of the mounting base relative to the bearing rail, thereby realizing the feed of the anchor rod during the rock drilling process.

3. A semi-automatic rock drilling rig for mining according to claim 2, characterized in that: A fixed frame is fixedly provided at one end of the bearing rail away from the fixed pulley. The sliding seat is connected to the bearing rail through a control cylinder. The fixed frame and the sliding seat are used to support the anchor rod. A wire harness clamp is fixedly provided on one side of the bearing rail.

4. A semi-automatic rock drilling rig for mining according to claim 3, characterized in that: The positioning assembly also includes a fixing plate fixedly connected to the fixing frame. A positioning cylinder is provided on the side of the fixing plate away from the fixing frame. The cylinder barrel of the positioning cylinder is fixedly connected to the fixing plate, and the piston rod of the positioning cylinder is connected to the movable sleeve.

5. A semi-automatic rock drilling rig for mining according to claim 4, characterized in that: The positioning plate includes an integral insertion hole and a clamping part, and a connecting rod fixedly disposed at one end of the clamping part and hinged to one end of the rotating rod. The insertion hole is used to insert into the rock hole, and the clamping part is used to clamp the drill bit. The insertion hole and the clamping part realize the positioning of the drill bit after it is separated from the rock hole.

6. A semi-automatic rock drilling rig for mining according to claim 5, characterized in that: The movable sleeve includes a sleeve body sleeved around the anchor rod, a mounting flange fixedly disposed at one end of the sleeve body and connected to the piston rod of the positioning cylinder, and a sliding groove formed on the periphery of the sleeve body to support the sliding of the sliding sleeve.

7. A semi-automatic rock drilling rig for mining according to claim 6, characterized in that: The movable sleeve further includes a fixed rod fixedly disposed at the end of the sleeve body away from the mounting flange, a fixed ring fixedly disposed at the end of the fixed rod away from the mounting flange, and a through hole disposed on the fixed ring and slidably connected to the connecting rod; the connecting rod passes through the through hole.

8. A semi-automatic rock drilling rig for mining according to claim 6, characterized in that: The sliding sleeve includes multiple snap-fit ​​parts that are slidably connected to the slide groove, a connecting part for connecting the multiple snap-fit ​​parts and located inside the sleeve body, and an extension part that is fixedly disposed on the snap-fit ​​parts and hinged to the end of the rotating rod away from the connecting rod.

9. A semi-automatic rock drilling rig for mining according to claim 4, characterized in that: The sliding sleeve is provided with a rubber washer, the outer side of the rubber washer is provided with an alignment groove, the inner wall of the sliding sleeve is provided with an installation groove, and a retaining ring is provided between the installation groove and the alignment groove. The installation groove, the alignment groove and the retaining ring cooperate, and the inner wall of the rubber washer forms a friction part. The shape of the friction part is adapted to the shape of the drill bit.

10. A semi-automatic rock drilling rig for mining according to claim 8, characterized in that: The movable sleeve is provided with a spring ring on its periphery, and a washer is fixed at each end of the spring ring. The two washer rings abut against the extension and the mounting flange, respectively.

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