CN213795920U

CN213795920U - Processing device for electronic electromechanical assembly

Info

Publication number: CN213795920U
Application number: CN202022662856.9U
Authority: CN
Inventors: 陈承; 秦海旺
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-07-27
Anticipated expiration: 2030-11-18

Abstract

The utility model relates to the electromechanical technical field, in particular to a processing device for an electronic electromechanical component, which comprises a bottom plate, wherein both ends of the upper surface of the bottom plate are fixedly connected with an L-shaped supporting plate, the L-shaped supporting plate is connected with a rotating barrel through a rotating mechanism, the rotating barrel is fixedly connected with a gear ring, the bottom plate is rotatably connected with a first connecting shaft through a bearing, the upper end of the first connecting shaft is fixedly connected with a gear, the bottom plate is rotatably connected with a third connecting shaft through a bearing, the third connecting shaft is provided with a second external thread, both ends of the rotating shaft are provided with first external threads, the two first external threads are provided with first movable plates through threads, two first movable plates are provided with a limiting mechanism, one of the first movable plates is fixedly connected with a first fixed rod, the opposite inner sides of the first fixed rod and the second fixed rod are fixedly connected with fixed disks, and the third connecting shaft is connected with the first connecting shaft through a driving mechanism. The utility model discloses be favorable to strengthening the characteristics of the effect of polishing.

Description

Processing device for electronic electromechanical assembly

Technical Field

The utility model relates to an electromechanical technical field especially relates to a processingequipment for electron electromechanical component.

Background

The electromechanical technology is combined with the applied mechanical technology and the electronic technology, along with the rapid development and wide application of the computer technology, the electromechanical integration technology is developed unprecedentedly, becomes a crossed system technology integrating a computer and an information technology, an automatic control technology, a sensing detection technology, a servo transmission technology, a mechanical technology and the like, is developed towards the optical electromechanical integration technology, and has wider application range.

The electromechanical assembly comprises all parts forming the electromechanical device, when the parts are assembled and installed, most of the parts are made of metal materials, after machining is completed, burrs are generated on the surface, the smoothness of the assembly is influenced, in the prior art, the assembly needing to be polished is placed into an abrasive material, the surface of the assembly is polished and the burrs are removed through movement of the abrasive material, but when the assembly is placed into the abrasive material, the assembly and the abrasive material can move together, relative movement between the abrasive material and the assembly is difficult to generate, and accordingly the polishing effect of the abrasive material on the assembly is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem that the grinding material and the component are difficult to move relatively in the prior art, and influencing the grinding material to polish the component, and providing a processing device for an electronic and electromechanical component.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the machining device for the electronic and electromechanical assembly comprises a bottom plate, wherein two ends of the upper surface of the bottom plate are fixedly connected with L-shaped supporting plates, the L-shaped supporting plates are connected with a rotating barrel through a rotating mechanism, the rotating barrel is fixedly connected with a gear ring, the bottom plate is rotatably connected with a first connecting shaft through a bearing, the upper end of the first connecting shaft is fixedly connected with a gear, the gear is meshed with the gear ring, the bottom plate is rotatably connected with a third connecting shaft through a bearing, a second external thread is arranged on the third connecting shaft, a transverse plate is in threaded through connection with the second external thread, a rotating shaft is rotatably connected onto the transverse plate through a bearing, two ends of the rotating shaft are respectively provided with a first external thread, the thread directions of the two first external threads are opposite, and a first moving plate is in threaded through connection with the two first external threads, two be provided with stop gear on the first movable plate, one of them fixedly connected with first dead lever on the first movable plate, another fixedly connected with second dead lever on the first movable plate, the second dead lever runs through it extends to rotate the bucket inside, first dead lever with the equal fixedly connected with fixed disk of the relative inboard of second dead lever, fixedly connected with fourth friction pulley in the pivot, be connected with fifth friction pulley through adjustment mechanism on the third connecting axle, the third connecting axle with connect through actuating mechanism between the first connecting axle.

Preferably, the rotating mechanism comprises a connecting ring fixedly connected with the lower end of the rotating barrel, a slide way is arranged on the outer side of the connecting ring, and the L-shaped supporting plate is slidably arranged on the slide way.

Preferably, the adjusting mechanism include with fixed connection's sleeve on the diaphragm, the telescopic internal plug has the lifter, the spacing dish of lower extreme fixedly connected with of lifter, the upper end fixedly connected with T shape slider of lifter, T shape spout has been seted up to the lower surface of fifth friction pulley, T shape slider slidable ground sets up in the T shape spout, the spacing arris of fixedly connected with on the third connecting axle, the spacing groove has been seted up on the fifth friction pulley, spacing arris slidable ground sets up in the spacing inslot.

Preferably, the limiting mechanism comprises a limiting rod fixedly connected with the first moving plate positioned at the upper end of the rotating barrel, the first moving plate positioned at the lower end of the rotating barrel is provided with a through hole, and the limiting rod can be inserted into the through hole.

Preferably, actuating mechanism include with bottom plate fixed mounting's motor, fixedly connected with adapter sleeve on the output shaft of motor, the adapter sleeve upper end is connected with the second friction pulley through elevating system, rotate through the bearing on the bottom plate and be connected with the second connecting axle, fixedly connected with third friction pulley on the second connecting axle, the second connecting axle with equal fixedly connected with belt pulley, two on the third connecting axle the cover is equipped with the belt between the belt pulley, the first friction pulley of fixedly connected with on the first connecting axle.

Preferably, the lifting mechanism include with fixed connection support frame on the bottom plate, screw thread through connection has the threaded rod on the support frame, the threaded rod lower extreme pass through thrust ball bearing with the second friction pulley rotates to be connected, threaded rod upper end fixedly connected with handle, second friction pulley lower extreme fixedly connected with carriage release lever, a plurality of connection keys of circumference equidistance fixedly connected with on the carriage release lever, a plurality of spread grooves have been seted up to the circumference equidistance on the link sleeve, the connection key can be pegged graft in the spread groove.

Preferably, a plurality of leakage holes are formed in the bottom wall of the rotary barrel at equal intervals on the circumference.

The utility model provides a processingequipment for electron electromechanical component, beneficial effect lies in: when rotating through the pivot, drive two movable plates and remove, press from both sides the subassembly tightly, drive the ring gear simultaneously and rotate through the gear, play the effect of motion to the abrasive material, thereby make the subassembly produce and produce relative displacement with the abrasive material, be favorable to the reinforcing to the effect of polishing, when carrying out the lapse through the diaphragm simultaneously, will make the fixed disk fix the subassembly earlier, then enter into the abrasive material again, when diaphragm rebound, will remove the fixed disk earlier, make the subassembly take out from the abrasive material, then relax the subassembly again, thereby be convenient for go up unloading on the subassembly.

Drawings

Fig. 1 is a first perspective view of a processing apparatus for an electronic-mechanical assembly according to the present invention;

fig. 2 is a second perspective view of the processing apparatus for an electronic-mechanical assembly according to the present invention;

fig. 3 is a third perspective view of the processing apparatus for an electronic-mechanical assembly according to the present invention;

fig. 4 is a fourth perspective view of the processing apparatus for an electronic-mechanical assembly according to the present invention;

fig. 5 is a front view of a processing apparatus for an electronic-mechanical-electrical component according to the present invention;

fig. 6 is an enlarged view of a portion a of fig. 1 of a processing apparatus for an electronic and electromechanical assembly according to the present invention;

fig. 7 is an enlarged view of a portion B of the processing apparatus for electronic-mechanical-electrical components shown in fig. 5 according to the present invention;

fig. 8 is an enlarged view of a portion C in fig. 4 of a processing apparatus for an electronic-mechanical assembly according to the present invention.

In the figure: the device comprises a first fixing rod 1, a fixing disk 2, a rotating barrel 3, a gear ring 4, a gear 5, a first connecting shaft 6, a first friction wheel 7, a bottom plate 8, an L-shaped supporting plate 9, a second fixing rod 10, a belt 11, a connecting ring 12, a first moving plate 13, a rotating shaft 14, a limiting rod 15, a motor 16, a second connecting shaft 17, a supporting frame 18, a threaded rod 19, a second friction wheel 20, a belt pulley 21, a third friction wheel 22, a handle 23, a moving rod 24, a connecting groove 25, a connecting sleeve 26, a connecting key 27, a first external thread 28, a fourth friction wheel 29, a transverse plate 30, a third connecting shaft 31, a fifth friction wheel 32, a second external thread 33, a limiting rib 34, a limiting groove 35, a lifting rod 36, a sleeve 37, a limiting disk 38, a T-shaped sliding groove 39, a T-shaped sliding block 40, a sliding way 41 and a leakage hole 42.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-8, a processing device for electronic and electromechanical components, comprising a bottom plate 8, wherein both ends of the upper surface of the bottom plate 8 are fixedly connected with an L-shaped supporting plate 9, the L-shaped supporting plate 9 is connected with a rotating barrel 3 through a rotating mechanism, the rotating barrel 3 is fixedly connected with a gear ring 4, the bottom plate 8 is rotatably connected with a first connecting shaft 6 through a bearing, the upper end of the first connecting shaft 6 is fixedly connected with a gear 5, the gear 5 is meshed with the gear ring 4, a plurality of leak holes 42 are equidistantly arranged on the circumference of the bottom wall of the rotating barrel 3, an abrasive material with a diameter larger than that of the leak holes 42 is placed in the rotating barrel 3, through the design of the leak holes 42, ground debris is discharged, the gear 5 is driven to rotate through the rotation of the first connecting shaft 6, the gear ring 4 is driven to rotate due to the meshing between the gear 5 and the gear ring 4, and the gear ring 4 is fixed, will drive the abrasive material that rotates in the bucket 3 and rotate, and the subassembly is fixed through fixed disk 2, makes subassembly and abrasive material produce relative displacement, is favorable to the effect of polishing.

A third connecting shaft 31 is rotatably connected on the bottom plate 8 through a bearing, a second external thread 33 is arranged on the third connecting shaft 31, a transverse plate 30 is in threaded through connection on the second external thread 33, a rotating shaft 14 is rotatably connected on the transverse plate 30 through a bearing, first external threads 28 are arranged at two ends of the rotating shaft 14, the thread directions of the two first external threads 28 are opposite, first moving plates 13 are in threaded through connection on the two first external threads 28, a limiting mechanism is arranged on the two first moving plates 13, a first fixed rod 1 is fixedly connected on one first moving plate 13, a second fixed rod 10 is fixedly connected on the other first moving plate 13, the second fixed rod 10 penetrates through the rotating barrel 3 and extends into the rotating barrel 3, a fixed disk 2 is fixedly connected on the inner sides of the first fixed rod 1 and the second fixed rod 10, and a fourth friction wheel 29 is fixedly connected on the rotating shaft 14, the third connecting shaft 31 is connected with a fifth friction wheel 32 through an adjusting mechanism, the third connecting shaft 31 is connected with the first connecting shaft 6 through a driving mechanism, the driving mechanism drives the third connecting shaft 31 to rotate in the forward direction, the transverse plate 30 is connected with the third connecting shaft 31 through threads, the transverse plate 30 is driven to move downwards, at the moment, as shown in fig. 5, the fourth friction wheel 29 is contacted with the fifth friction wheel 32 to drive the fourth friction wheel 29 to rotate, the fourth friction wheel 29 is fixedly connected with the rotating shaft 14 to drive the rotating shaft 14 to rotate, as the first external threads 28 are arranged at two ends of the rotating shaft 14 and the thread directions are opposite, the two first moving plates 13 are driven to move in opposite directions, so that the first fixing rod 1 moves downwards, and the second fixing rod 10 moves upwards, so that the two fixing disks 2 clamp the assembly, after clamping, under the action of the adjusting mechanism, the fourth friction wheel 29 is separated from the fifth friction wheel 32, the rotating shaft 14 does not rotate, the third connecting shaft 31 still rotates, the component continues to move downwards and enters the grinding materials for grinding, when the third connecting shaft 31 rotates reversely, the transverse plate 30 is driven to ascend, the component is taken out of the grinding materials, and meanwhile, when the transverse plate 30 continuously ascends, under the action of the adjusting mechanism, the fourth friction wheel 29 is made to be in contact with the fifth friction wheel 32, the rotating shaft 14 rotates again, the rotating direction of the rotating shaft 14 is opposite to the descending direction of the transverse plate 30, so that the two first movable plates 13 are driven to move back and forth, the fixed disc 2 loosens the component, and the component is conveniently loaded and unloaded.

The rotating mechanism comprises a connecting ring 12 fixedly connected with the lower end of the rotating barrel 3, a slide way 41 is arranged on the outer side of the connecting ring 12, the slide way 41 is annular, the L-shaped supporting plate 9 can be slidably arranged on the slide way 41, the L-shaped supporting plate 9 and the connecting ring 12 are designed to support the rotating barrel 3, and the L-shaped supporting plate 9 is driven to slide in the slide way 41 when the rotating barrel 3 rotates.

The adjusting mechanism comprises a sleeve 37 fixedly connected with the transverse plate 30, a lifting rod 36 can be inserted into the sleeve 37, the lower end of the lifting rod 36 is fixedly connected with a limiting disc 38, the upper end of the lifting rod 36 is fixedly connected with a T-shaped slide block 40, the lower surface of the fifth friction wheel 32 is provided with a T-shaped slide groove 39, the T-shaped slide block 40 is slidably arranged in the T-shaped slide groove 39, a limiting edge 34 is fixedly connected with the third connecting shaft 31, a limiting groove 35 is arranged on the fifth friction wheel 32, the limiting edge 34 is slidably arranged in the limiting groove 35, when the transverse plate 30 moves downwards, the sleeve 37 is driven to move downwards, as the transverse plate 30 continuously descends, the limiting disc 38 is enabled to be abutted against the upper end position of the sleeve 37, a pulling force is formed on the fifth friction wheel 32, the fifth friction wheel 32 is enabled to be separated from the fourth friction wheel 29, when the transverse plate 30 moves upwards, the transverse plate 30 continuously ascends, the limiting disc 38 is abutted against the lower end of the sleeve 37 to form thrust on the fifth friction wheel 32, so that the fifth friction wheel 32 is in contact with the fourth friction wheel 29 to drive the fourth friction wheel 29 to rotate, when the fifth friction wheel 32 rotates, the T-shaped sliding block 40 is driven to slide in the T-shaped sliding groove 39 to play a role of a bearing and simultaneously perform axial load, and the design of the limiting groove 35 and the limiting edge 34 plays a role of limiting the fifth friction wheel 32 to ensure that the third connecting shaft 31 can still drive the fifth friction wheel 32 to rotate when the fifth friction wheel 32 moves up and down.

The limiting mechanism comprises a limiting rod 15 fixedly connected with the first moving plate 13 positioned at the upper end of the rotating barrel 3, a through hole is formed in the first moving plate 13 positioned at the lower end of the rotating barrel 3, the limiting rod 15 can be inserted into the through hole, and the first moving plate 13 is limited by the design of the through hole and the limiting rod 15, so that the rotating shaft 14 is prevented from driving the first moving plate 13 to rotate when rotating, and the first moving plate 13 is ensured to move up and down only.

The driving mechanism comprises a motor 16 fixedly installed on the bottom plate 8, an output shaft of the motor 16 is fixedly connected with a connecting sleeve 26, the upper end of the connecting sleeve 26 is connected with a second friction wheel 20 through a lifting mechanism, the bottom plate 8 is rotatably connected with a second connecting shaft 17 through a bearing, a third friction wheel 22 is fixedly connected on the second connecting shaft 17, belt pulleys 21 are fixedly connected on the second connecting shaft 17 and a third connecting shaft 31, a belt 11 is sleeved between the two belt pulleys 21, a first friction wheel 7 is fixedly connected on the first connecting shaft 6 and is rotated through the motor 16 to drive the connecting sleeve 26 to rotate, the position of the second friction wheel 20 is adjusted through the lifting mechanism, when the second friction wheel 20 is contacted with the third friction wheel 22, the third friction wheel 22 is driven to rotate, the third friction wheel 22 drives the second connecting shaft 17 to rotate, so as to drive the belt pulleys 21 to rotate, under the effect of belt 11, it rotates to drive third connecting axle 31, thereby go up unloading to the subassembly, through control motor 16 just reversal, drive third connecting axle 31 corotation or reversal, when second friction pulley 20 contacts with first friction pulley 7, will drive first friction pulley 7 and rotate, thereby drive first connecting axle 6, adopt a motor 16 to drive, the power supply has been saved, also be favorable to controlling the device simultaneously, guaranteed that the device can only be in and go up unloading or polish, it goes on with polishing simultaneously to have avoided going up unloading, cause the chaotic condition.

The lifting mechanism comprises a supporting frame 18 fixedly connected with the bottom plate 8, a threaded rod 19 is connected with the supporting frame 18 in a threaded penetrating way, the lower end of the threaded rod 19 is rotatably connected with a second friction wheel 20 through a thrust ball bearing, a handle 23 is fixedly connected with the upper end of the threaded rod 19, a moving rod 24 is fixedly connected with the lower end of the second friction wheel 20, a plurality of connecting keys 27 are fixedly connected with the upper circumference of the moving rod 24 at equal intervals, a plurality of connecting grooves 25 are formed in the upper circumference of the connecting sleeve 26 at equal intervals, the connecting keys 27 can be inserted into the connecting grooves 25, the position of the second friction wheel 20 can be adjusted by rotating the handle 23, so that the working state of the device can be changed, when the connecting sleeve 26 is driven by the motor 16 to rotate, due to the design of the connecting grooves 25 and the connecting keys 27, the moving rod 24 can still be guaranteed to rotate when moving up and down and moving rod 24 is fixedly connected with the second friction wheel 20, thereby ensuring that the second friction wheel 20 rotates.

When in use, the component is placed between the two fixed disks 2, the driving mechanism drives the third connecting shaft 31 to rotate in the forward direction, the transverse plate 30 is driven to move downwards, the fourth friction wheel 29 contacts with the five friction wheels 32, so as to drive the fourth friction wheel 29 to rotate, the fourth friction wheel 29 is fixedly connected to the rotating shaft 14, so as to drive the rotating shaft 14 to rotate, the first external threads 28 are formed at the two ends of the rotating shaft 14, the threads are in opposite directions, so as to drive the two first moving plates 13 to move in opposite directions, so that the first fixing rod 1 moves downwards, the second fixing rod 10 moves upwards, so as to enable the two fixed disks 2 to clamp the component, after clamping, the limiting disk 38 is abutted against the upper end position of the sleeve 37, so as to form a pulling force on the fifth friction wheel 32, so as to enable the fifth friction wheel 32 to be separated from the fourth friction wheel 29, and the rotating shaft 14 will not rotate, the third connecting shaft 31 still rotates to move the component downwards to enter the abrasive, then the driving mechanism drives the first connecting shaft 6 to rotate to drive the gear ring 4 to rotate, the gear ring 4 is fixed on the rotating barrel 3 to drive the abrasive in the rotating barrel 3 to rotate, the component is fixed through the fixed disk 2 to enable the component and the abrasive to generate relative displacement, which is beneficial to the polishing effect, after polishing is finished, the driving mechanism drives the third connecting shaft 31 to rotate reversely to drive the transverse plate 30 to ascend, the component is taken out of the abrasive, meanwhile, when the transverse plate 30 continuously ascends, the limiting disk 38 is abutted against the lower end position of the sleeve 37 to form thrust on the fifth friction wheel 32, the fifth friction wheel 32 moves upwards to enable the fifth friction wheel 32 to contact with the fourth friction wheel 29, the rotating shaft 14 rotates again, the rotating direction of the rotating shaft 14 is opposite to the descending direction of the transverse plate 30, thereby drive two first movable plates 13 and do the back-to-back motion, fixed disk 2 relaxes the subassembly to go up unloading to the subassembly.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The processing device for the electronic and electromechanical assembly comprises a bottom plate (8) and is characterized in that two ends of the upper surface of the bottom plate (8) are fixedly connected with L-shaped supporting plates (9), the L-shaped supporting plates (9) are connected with a rotating barrel (3) through a rotating mechanism, the rotating barrel (3) is fixedly connected with a gear ring (4), the bottom plate (8) is rotatably connected with a first connecting shaft (6) through a bearing, the upper end of the first connecting shaft (6) is fixedly connected with a gear (5), the gear (5) is meshed with the gear ring (4), the bottom plate (8) is rotatably connected with a third connecting shaft (31) through a bearing, a second external thread (33) is arranged on the third connecting shaft (31), a transverse plate (30) is in threaded through connection with the second external thread (33), and a rotating shaft (14) is rotatably connected with the transverse plate (30) through a bearing, first external threads (28) are formed at two ends of the rotating shaft (14), the thread directions of the two first external threads (28) are opposite, first movable plates (13) are connected to the two first external threads (28) in a threaded penetrating manner, limiting mechanisms are arranged on the two first movable plates (13), one of the first movable plates (13) is fixedly connected with a first fixed rod (1), the other first movable plate (13) is fixedly connected with a second fixed rod (10), the second fixed rod (10) penetrates through the rotating barrel (3) and extends into the rotating barrel (3), fixed disks (2) are fixedly connected to the inner sides of the first fixed rod (1) and the second fixed rod (10) opposite to each other, a fourth friction wheel (29) is fixedly connected to the rotating shaft (14), and a fifth friction wheel (32) is connected to a third connecting shaft (31) through an adjusting mechanism, the third connecting shaft (31) is connected with the first connecting shaft (6) through a driving mechanism.

2. The processing device for the electronic and electromechanical assembly according to claim 1, wherein the rotating mechanism comprises a connecting ring (12) fixedly connected to the lower end of the rotating barrel (3), a slide way (41) is opened on the outer side of the connecting ring (12), and the L-shaped supporting plate (9) is slidably disposed on the slide way (41).

3. The processing device for the electronic and electromechanical assembly according to claim 1, wherein the adjusting mechanism includes a sleeve (37) fixedly connected to the transverse plate (30), a lifting rod (36) is inserted into the sleeve (37), a limiting disc (38) is fixedly connected to a lower end of the lifting rod (36), a T-shaped slider (40) is fixedly connected to an upper end of the lifting rod (36), a T-shaped sliding slot (39) is formed in a lower surface of the fifth friction wheel (32), the T-shaped slider (40) is slidably disposed in the T-shaped sliding slot (39), a limiting rib (34) is fixedly connected to the third connecting shaft (31), a limiting groove (35) is formed in the fifth friction wheel (32), and the limiting rib (34) is slidably disposed in the limiting groove (35).

4. The processing device for the electronic and electromechanical assembly according to claim 1, wherein the limiting mechanism comprises a limiting rod (15) fixedly connected to the first moving plate (13) at the upper end of the rotating barrel (3), the first moving plate (13) at the lower end of the rotating barrel (3) is provided with a through hole, and the limiting rod (15) can be inserted into the through hole.

5. The processing device for the electronic and electromechanical assembly according to claim 1, wherein the driving mechanism comprises a motor (16) fixedly mounted on the base plate (8), a connecting sleeve (26) is fixedly connected to an output shaft of the motor (16), a second friction wheel (20) is connected to the upper end of the connecting sleeve (26) through a lifting mechanism, a second connecting shaft (17) is rotatably connected to the base plate (8) through a bearing, a third friction wheel (22) is fixedly connected to the second connecting shaft (17), a belt (11) is sleeved between the second connecting shaft (17) and a belt pulley (21) is fixedly connected to the third connecting shaft (31), and a first friction wheel (7) is fixedly connected to the first connecting shaft (6).

6. The processing device for the electronic and electromechanical assembly according to claim 5, wherein the lifting mechanism comprises a support frame (18) fixedly connected to the bottom plate (8), a threaded rod (19) is connected to the support frame (18) in a threaded through manner, a lower end of the threaded rod (19) is rotatably connected to the second friction wheel (20) through a thrust ball bearing, a handle (23) is fixedly connected to an upper end of the threaded rod (19), a moving rod (24) is fixedly connected to a lower end of the second friction wheel (20), a plurality of connection keys (27) are fixedly connected to the moving rod (24) at equal intervals on the circumference, a plurality of connection slots (25) are formed on the connection sleeve (26) at equal intervals on the circumference, and the connection keys (27) are inserted into the connection slots (25).