Tool for continuous machining of parts

Abstract

The tool for continuous machining of the parts comprises a supporting base, a plurality of adjusting grooves are formed in the top of the supporting base in an annular array mode, sliding rods are fixedly connected to the inner walls of the adjusting grooves, the sliding rods are slidably sleeved with adjusting blocks, and the tops of the adjusting blocks are fixedly connected with a mounting frame; according to the tool for continuous machining of the parts, the adjusting mechanism, the adjusting block, the mounting frame, the mounting block and the clamping blocks are arranged, so that the function of driving the multiple sets of clamping blocks to conduct synchronous adjusting and clamping is achieved, it is guaranteed that when the parts are clamped, positioning is accurate, stress is uniform, the clamping blocks can be rapidly disassembled, assembled and replaced according to needs, and the machining efficiency is improved. The adaptation effect is better; the dust collection cover can be driven to swing in a reciprocating mode through the arrangement of the swing mechanism, sweeps in a machining area can be evenly cleaned in cooperation with multiple sets of dust collection openings in the dust collection cover, the influence of attached and accumulated sweeps on the follow-up machining precision is effectively avoided, and the service life of equipment is prolonged.

Description

Technical Field

[0001] This invention relates to the field of parts processing technology, specifically to a tooling for continuous parts processing. Background Technology

[0002] Chamfering is a fundamental process in machining. It involves using cutting or other methods to transform sharp edges and corners into bevels or rounded surfaces. The purpose is to remove burrs and sharp edges, improving the fit and safety of assembly, while also optimizing the appearance of the parts. Fixtures are needed to hold the parts in place during continuous machining.

[0003] In existing continuous machining fixtures for parts, although most of the waste is absorbed by the dust extraction mechanism of the machining equipment during chamfering, some waste still adheres to the fixture. Traditional fixtures mostly lack self-cleaning capabilities, easily leading to waste accumulation, which affects the processing and use of subsequent parts and reduces the overall efficiency of the equipment. Therefore, we propose a new fixture for continuous machining of parts. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a tooling for continuous part processing, which solves the problem that most traditional tooling lacks self-cleaning function, easily leading to the accumulation of waste chips, affecting the processing and use of subsequent parts, and reducing the effectiveness of the device.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A tooling for continuous machining of parts includes a support base. The top of the support base has multiple adjustment slots arranged in a circular array. A slide rod is fixedly connected to the inner wall of the adjustment slot. An adjustment block is slidably sleeved on the outside of the slide rod. A mounting frame is fixedly connected to the top of the adjustment block. An installation block is installed inside the mounting frame by bolts. A clamping block is fixedly connected to one side of the installation block. The support base is provided with an adjustment mechanism for moving the adjustment block. The outer side of the support base is fixedly connected to multiple fixed frames in a circular array. A rotating shaft is rotatably connected between two adjacent fixed frames. A connecting seat is fixedly sleeved on the outside of the rotating shaft. A dust suction hood is fixedly connected to one end of the connecting seat. Dust suction ports are equidistantly opened on one side of the dust suction hood. The inside of the support base is provided with a swing mechanism for driving the dust suction hood to swing.

[0006] In a preferred embodiment, the adjustment mechanism includes a support frame fixedly connected to the inner cavity of the support base, a connecting frame fixedly connected to the top of the support frame, guide rods symmetrically fixedly connected between the connecting frame and the support frame, a lifting block slidably sleeved on the outside of the guide rod, and multiple fixed rods fixedly connected in a circular array on the outer side of the lifting block, a connecting rod rotatably connected to the end of the fixed rod away from the lifting block, and the end of the connecting rod away from the fixed rod rotatably connected to the adjustment block.

[0007] The technical effect of adopting the above-mentioned further solution is that the movement of the lifting block can be limited by setting two sets of guide rods, so that the lifting block slides along the guide rods to prevent deviation. The lifting block drives the fixed rod to move, and the movement of the fixed rod drives multiple sets of connecting rods to rotate, thereby driving multiple sets of adjusting blocks to move.

[0008] In a preferred embodiment, a lead screw is rotatably connected between the connecting frame and the support frame, the lifting block is threadedly connected to the lead screw, and one end of the lead screw passes through the support frame and is fixedly connected to a second bevel gear.

[0009] The technical effect of adopting the above-mentioned further solution is that the rotation of the lead screw drives the lifting block to move, which in turn drives multiple sets of fixed rods to move.

[0010] In a preferred embodiment, the swing mechanism includes a plurality of limiting rods fixedly connected in a ring array to the inner cavity of the support base. An L-shaped connecting rod is slidably sleeved on the outside of the limiting rod. One end of the L-shaped connecting rod passes through the support base and extends into the interior of the fixed frame. A rack is fixedly connected to the end of the L-shaped connecting rod extending into the fixed frame. One end of the rotating shaft extends into the fixed frame. A sector gear that cooperates with the rack is fixedly sleeved at the end of the rotating shaft extending into the fixed frame.

[0011] The technical effect of adopting the above-mentioned further solution is that the movement of the L-shaped connecting rod can be limited by the setting of the limiting rod to prevent deviation. The L-shaped connecting rod drives the rack to move, and the movement of the rack drives the sector gear to rotate, which in turn drives the rotating shaft to rotate.

[0012] In a preferred embodiment, the L-shaped connecting rod is slidably connected to the fixed frame, and the support base has multiple through slots arranged in a circular array inside, with the L-shaped connecting rod slidably connected to the through slots.

[0013] The technical effect of adopting the above-mentioned further solution is that the through groove can help limit the movement of the L-shaped connecting rod and prevent deviation.

[0014] In a preferred embodiment, the support base is provided with a transmission assembly for driving the L-shaped connecting rod to reciprocate. The transmission assembly includes a connecting shaft rotatably connected inside the support frame. Both ends of the connecting shaft are fixedly connected to discs. A cylinder is eccentrically fixedly connected to the side of the disc away from the support frame. One end of the L-shaped connecting rod is fixedly connected to a lifting frame. Connecting frames are symmetrically fixedly connected to the inner wall of the lifting frame. The connecting frame has a connecting groove inside that cooperates with the cylinder.

[0015] The technical effect of adopting the above-mentioned further solution is that the connecting shaft drives the cylinder to rotate through the disc, so that the cylinder and the connecting groove cooperate to use, thereby squeezing and driving the connecting frame to move back and forth when the cylinder rotates. The connecting frame drives multiple sets of L-shaped connecting rods to move back and forth through the lifting frame.

[0016] In a preferred embodiment, a worm gear is fixedly sleeved on the outside of the connecting shaft, a support platform is fixedly connected to one side of the support frame, and a worm gear that cooperates with the worm gear is rotatably connected between the support platform and the support frame.

[0017] The technical effect of adopting the above-mentioned further solution is that the worm gear drives the worm wheel to rotate, and the worm wheel drives the connecting shaft to rotate.

[0018] In a preferred embodiment, a motor is fixedly connected to the outer side of the support platform, the output end of the motor is fixedly connected to the worm gear, and a first bevel gear that cooperates with the second bevel gear is fixedly sleeved on the outside of the connecting shaft.

[0019] The technical effect of adopting the above-mentioned further solution is that the motor drives the worm to rotate, the connecting shaft drives the second bevel gear to rotate through the first bevel gear, and then drives the lead screw to rotate.

[0020] This invention provides a tooling for continuous machining of parts. Compared with the prior art, it has the following advantages: 1. This tooling for continuous machining of parts, through the setting of adjustment mechanism, adjustment block, mounting bracket, mounting block and clamping block, realizes the function of driving multiple sets of clamping blocks to adjust and clamp synchronously. With the limiting and guiding effect of slide rod on adjustment block, it effectively avoids the problem of clamping block offset during movement, ensuring accurate positioning and uniform force when clamping parts, providing a reliable guarantee for the accuracy of continuous chamfering machining, and the clamping blocks can be quickly disassembled and replaced according to needs, with better adaptation effect.

[0021] 2. The tooling for continuous processing of this part can drive the dust collection hood to swing back and forth through the setting of the swing mechanism. With the multiple sets of dust collection ports on the dust collection hood, the waste in the processing area can be cleaned evenly. Compared with the fixed position dust collection method, the swing dust collection can cover all corners of key components such as mounting frame and clamping block, effectively avoiding the impact of waste accumulation on the subsequent processing accuracy and extending the service life of the equipment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the support base of the present invention; Figure 3 This is an enlarged view of part A of the present invention; Figure 4 This is a schematic diagram of the internal structure of the support base of the present invention; Figure 5 This is a schematic diagram of the lifting frame of the present invention; Figure 6 This is an enlarged view of part B of the present invention; Figure 7 This is a schematic diagram of the structure of the L-shaped connecting rod of the present invention; Figure 8 This is an enlarged view of part C of the present invention; Figure 9 This is a schematic diagram of the support frame of the present invention; Figure 10 This is a schematic diagram of the internal structure of the fixing frame of the present invention; Figure 11 This is an exploded view of the adjusting block of the present invention.

[0023] Legend: 1. Support base; 11. Fixing frame; 12. Connecting base; 13. Dust hood; 14. Limiting rod; 15. Rotating shaft; 16. Slide rod; 17. Through groove; 18. Sector gear; 2. Adjusting block; 21. Clamping block; 22. Connecting rod; 23. Adjusting groove; 24. Mounting bracket; 25. Mounting block; 3. Lifting frame; 31. L-shaped connecting rod; 32. Rack; 33. Connecting frame; 34. Connecting groove; 4. Support frame; 41. Connecting shaft; 42. Worm gear; 43. Worm; 44. First bevel gear; 45. Support platform; 46. Motor; 47. Disc; 48. Cylinder; 5. Connecting frame; 51. Second bevel gear; 52. Fixing rod; 53. Lifting block; 54. Lead screw; 55. Guide rod. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Please see Figures 1 to 11 The present invention provides a technical solution: like Figure 1 , Figure 2 and Figure 3 As shown: A tooling for continuous machining of parts includes a support base 1. Multiple adjusting grooves 23 are arranged in a circular array on the top of the support base 1. A sliding rod 16 is fixedly connected to the inner wall of each adjusting groove 23. An adjusting block 2 is slidably sleeved on the outside of the sliding rod 16. A mounting frame 24 is fixedly connected to the top of the adjusting block 2. A mounting block 25 is bolted to the inside of the mounting frame 24. A clamping block 21 is fixedly connected to one side of the mounting block 25. The support base 1 has an adjusting mechanism for moving the adjusting block 2. The adjusting grooves 23 and sliding rods 16 limit the movement of the adjusting block 2 to prevent offset. The adjusting block 2 moves the clamping block 21, facilitating clamping and fixing of parts. The mounting block 25 and mounting frame 24 allow for quick assembly and disassembly of the clamping block 21, facilitating the replacement of different clamping blocks 21 for better compatibility. The outer side of the support base 1 is fixedly connected with multiple fixed frames 11 in a circular array. A rotating shaft 15 is rotatably connected between two adjacent fixed frames 11. A connecting seat 12 is fixedly sleeved on the outside of the rotating shaft 15. A dust suction hood 13 is fixedly connected to one end of the connecting seat 12. Dust suction ports are equidistantly opened on one side of the dust suction hood 13. A dust suction pipe is provided on the outside of the dust suction hood 13. The inside of the support base 1 is provided with a swing mechanism for driving the dust suction hood 13 to swing.

[0026] In this solution, the swing mechanism can drive the dust hood 13 to swing and vacuum, thereby evenly cleaning the debris and other debris attached to the mounting bracket 24 and clamping block 21, resulting in better cleaning effect.

[0027] like Figure 2 , Figure 3 and Figure 9As shown: In this scheme, the adjustment mechanism includes a support frame 4 fixedly connected to the inner cavity of the support base 1. A connecting frame 5 is fixedly connected to the top of the support frame 4. Guide rods 55 are symmetrically fixedly connected between the connecting frame 5 and the support frame 4. A lifting block 53 is slidably sleeved on the outside of the guide rod 55. Multiple fixed rods 52 are fixedly connected in a ring array on the outer side of the lifting block 53. A connecting rod 22 is rotatably connected to the end of the fixed rod 52 away from the lifting block 53. The end of the connecting rod 22 away from the fixed rod 52 is rotatably connected to the adjustment block 2. A lead screw 54 is rotatably connected between the connecting frame 5 and the support frame 4. The lifting block 53 is threadedly connected to the lead screw 54. One end of the lead screw 54 passes through the support frame 4 and is fixedly connected to a second bevel gear 51.

[0028] In this solution, when it is necessary to clamp the part, the part is placed on the top of the support base 1. The rotation of the lead screw 54 drives the lifting block 53 to move downward along the two sets of guide rods 55. The lifting block 53 drives the fixed rod 52 to move downward. The movement of the fixed rod 52 drives the multiple sets of connecting rods 22 to rotate, which in turn drives the multiple sets of adjusting blocks 2 to move along the slide rod 16 towards the center of the support base 1. The adjusting blocks 2 drive the clamping block 21 to move, thereby clamping and fixing the part to be processed, which facilitates continuous chamfering of the part. When the part needs to be loosened after processing, the lifting block 53 moves upward along the two sets of guide rods 55 by the reverse rotation of the lead screw 54. The lifting block 53 drives the fixed rod 52 to move upward. The movement of the fixed rod 52 drives the multiple sets of connecting rods 22 to rotate, thereby driving the multiple sets of adjusting blocks 2 to move towards the edge of the support seat 1. The adjusting blocks 2 drive the clamping block 21 to move away from the part, thereby loosening the part.

[0029] like Figure 4 , Figure 7 and Figure 10 As shown: In this scheme, the swing mechanism includes multiple limiting rods 14 fixedly connected in a ring array to the inner cavity of the support base 1. An L-shaped connecting rod 31 is slidably sleeved on the outside of the limiting rod 14. One end of the L-shaped connecting rod 31 passes through the support base 1 and extends into the interior of the fixed frame 11. A rack 32 is fixedly connected to the end of the L-shaped connecting rod 31 extending into the fixed frame 11. One end of the rotating shaft 15 extends into the fixed frame 11. A sector gear 18 that cooperates with the rack 32 is fixedly sleeved at the end of the rotating shaft 15 extending into the fixed frame 11. The L-shaped connecting rod 31 is slidably connected to the fixed frame 11. Multiple through slots 17 are opened in a ring array inside the support base 1. The L-shaped connecting rod 31 is slidably connected to the through slots 17 to assist in limiting the movement of the L-shaped connecting rod 31.

[0030] In this solution, the L-shaped connecting rod 31 drives the rack 32 to move back and forth, thereby driving the sector gear 18 to rotate back and forth. The sector gear 18 drives the dust collection hood 13 to swing and collect dust through the rotating shaft 15 and the connecting seat 12, which can evenly clean the waste and debris attached to the mounting bracket 24 and clamping block 21, and the cleaning effect is better.

[0031] like Figures 5 to 9 As shown: In this scheme, the support base 1 is equipped with a transmission assembly for driving the L-shaped connecting rod 31 to reciprocate. The transmission assembly includes a connecting shaft 41 rotatably connected inside the support frame 4. Both ends of the connecting shaft 41 are fixedly connected to a disc 47. A cylinder 48 is eccentrically fixedly connected to the side of the disc 47 away from the support frame 4. One end of the L-shaped connecting rod 31 is fixedly connected to a lifting frame 3. A connecting frame 33 is symmetrically fixedly connected to the inner wall of the lifting frame 3. The connecting frame 33 has a connecting groove 34 inside that cooperates with the cylinder 48. A worm gear 42 is fixedly sleeved on the outside of the connecting shaft 41. A support platform 45 is fixedly connected to one side of the support frame 4. A worm 43 that cooperates with the worm gear 42 is rotatably connected between the support platform 45 and the support frame 4. A motor 46 is fixedly connected to the outer side of the support platform 45. The output end of the motor 46 is fixedly connected to the worm 43. A first bevel gear 44 that cooperates with the second bevel gear 51 is fixedly sleeved on the outside of the connecting shaft 41.

[0032] In this scheme, the motor 46 drives the worm wheel 42 to rotate through the worm gear 43, the worm wheel 42 drives the connecting shaft 41 to rotate, and the connecting shaft 41 drives the cylinder 48 to rotate through the disc 47, so that the cylinder 48 cooperates with the connecting groove 34. Thus, when the cylinder 48 rotates, it squeezes and drives the connecting frame 33 to reciprocate and move up and down. The connecting frame 33 drives multiple sets of L-shaped connecting rods 31 to reciprocate and move through the lifting frame 3.

[0033] Working principle: In use, the support base 1 is installed on the worktable for continuous part processing. When continuous chamfering of the part is required, the part is placed on the top of the support base 1, and the motor 46 is started. The motor 46 drives the worm wheel 42 to rotate through the worm 43. The worm wheel 42 drives the connecting shaft 41 to rotate. The connecting shaft 41 drives the second bevel gear 51 to rotate through the first bevel gear 44, thereby driving the lead screw 54 to rotate. The rotation of the lead screw 54 drives the lifting block 53 to move downward along the two sets of guide rods 55. The lifting block 53 drives the fixed rod 52 to move downward. The movement of the fixed rod 52 drives the multiple sets of connecting rods 22 to rotate, thereby driving the multiple sets of adjusting blocks 2 to move along the slide rod 16 towards the center of the support base 1. The adjusting blocks 2 drive the clamping block 21 to move, thereby clamping and fixing the part to be processed, which facilitates continuous chamfering of the part. When the part needs to be loosened after processing, the motor 46 is started. The motor 46 drives the worm wheel 42 to rotate through the worm 43. The worm wheel 42 drives the connecting shaft 41 to rotate in the opposite direction. The connecting shaft 41 drives the second bevel gear 51 to rotate in the opposite direction through the first bevel gear 44, thereby driving the lead screw 54 to rotate in the opposite direction. The reverse rotation of the lead screw 54 drives the lifting block 53 to move upward along the two sets of guide rods 55. The lifting block 53 drives the fixed rod 52 to move upward. The movement of the fixed rod 52 drives the multiple sets of connecting rods 22 to rotate, thereby driving the multiple sets of adjusting blocks 2 to move towards the edge of the support base 1. The adjusting blocks 2 drive the clamping block 21 to move away from the part, thereby loosening the part. Meanwhile, the suction pipe of the dust hood 13 is connected to the external filter equipment and fan. The dust suction port of the dust hood 13 can clean the debris attached to the mounting frame 24 and clamping block 21. When the adjusting block 2 moves to the edge of the support base 1, the connecting shaft 41 drives the cylinder 48 to rotate through the disc 47, so that the cylinder 48 cooperates with the connecting groove 34. When the cylinder 48 rotates, it squeezes and drives the connecting frame 33 to move back and forth. The connecting frame 33 drives multiple sets of L-shaped connecting rods 31 to move back and forth through the lifting frame 3. The L-shaped connecting rods 31 drive the rack 32 to move back and forth, thereby driving the sector gear 18 to rotate back and forth. The sector gear 18 drives the dust hood 13 to swing and suck up dust through the rotating shaft 15 and the connecting base 12. This can clean the debris attached to the mounting frame 24 and clamping block 21 evenly, and the cleaning effect is better.

[0034] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tool for continuous machining of a part, comprising a support seat (1), characterized in that: The top of the support seat (1) is provided with a plurality of adjusting grooves (23) in annular array, the inner wall of the adjusting groove (23) is fixedly connected with a sliding rod (16), the outer portion of the sliding rod (16) is slidably sleeved with an adjusting block (2), the top of the adjusting block (2) is fixedly connected with a mounting frame (24), the inside of the mounting frame (24) is provided with a mounting block (25) through a bolt, one side of the mounting block (25) is fixedly connected with a clamping block (21), the inside of the support seat (1) is provided with an adjusting mechanism for driving the adjusting block (2) to move. The outer side of the support seat (1) is fixedly connected with a plurality of fixed frames (11) in annular array, two adjacent fixed frames (11) are rotatably connected with a rotating shaft (15), the outer portion of the rotating shaft (15) is fixedly sleeved with a connecting seat (12), one end of the connecting seat (12) is fixedly connected with a dust cover (13), a plurality of dust suction ports are equidistantly formed in one side of the dust cover (13), the inside of the support seat (1) is provided with a swinging mechanism for driving the dust cover (13) to swing.

2. The tooling for continuous machining of a part according to claim 1, wherein: The adjusting mechanism comprises a supporting frame (4) fixedly connected in the inner cavity of the support seat (1), the top of the supporting frame (4) is fixedly connected with a connecting frame (5), the connecting frame (5) and the supporting frame (4) are symmetrically fixedly connected with a guide rod (55), the outer portion of the guide rod (55) is slidably sleeved with a lifting block (53), the outer side of the lifting block (53) is fixedly connected with a plurality of fixed rods (52) in annular array, one end of the fixed rod (52) away from the lifting block (53) is rotatably connected with a connecting rod (22), one end of the connecting rod (22) away from the fixed rod (52) is rotatably connected with the adjusting block (2).

3. The tooling for the continuous machining of a part according to claim 2, characterized in that: The connecting frame (5) and the supporting frame (4) are rotatably connected with a lead screw (54), the lifting block (53) is threadedly connected with the lead screw (54), one end of the lead screw (54) penetrates through the supporting frame (4) and is fixedly connected with a second bevel gear (51).

4. The tooling apparatus of claim 3, wherein: The swinging mechanism comprises a plurality of limiting rods (14) fixedly connected in the inner cavity of the support seat (1) in annular array, the outer portion of the limiting rod (14) is slidably sleeved with an L-shaped connecting rod (31), one end of the L-shaped connecting rod (31) penetrates through the support seat (1) and extends into the inside of the fixed frame (11), one end of the L-shaped connecting rod (31) extending into the inside of the fixed frame (11) is fixedly connected with a rack (32), one end of the rotating shaft (15) extends into the inside of the fixed frame (11), one end of the rotating shaft (15) extending into the inside of the fixed frame (11) is fixedly sleeved with a sector gear (18) used in cooperation with the rack (32).

5. The tooling apparatus of claim 4, wherein: The L-shaped connecting rod (31) is slidably connected with the fixed frame (11), the inside of the support seat (1) is provided with a plurality of through grooves (17) in annular array, the L-shaped connecting rod (31) is slidably connected with the through groove (17).

6. The tooling apparatus of claim 4, wherein: The inside of the support seat (1) is provided with a transmission assembly for driving the L-shaped connecting rod (31) to move back and forth, the transmission assembly comprises a connecting shaft (41) which is rotatably connected in the support frame (4), both ends of the connecting shaft (41) are fixedly connected with a disc (47), the side, away from the support frame (4), of the disc (47) is fixedly connected with a cylinder (48) eccentrically, one end of the L-shaped connecting rod (31) is fixedly connected with a lifting frame (3), the inner wall of the lifting frame (3) is fixedly connected with a connecting frame (33) symmetrically, the inside of the connecting frame (33) is provided with a connecting groove (34) which is used in cooperation with the cylinder (48).

7. The tooling apparatus of claim 6, wherein: The outside of the connecting shaft (41) is fixedly sleeved with a worm gear (42), one side of the support frame (4) is fixedly connected with a support table (45), the support table (45) and the support frame (4) are rotatably connected with a worm (43) which is used in cooperation with the worm gear (42).

8. The tooling apparatus of claim 7, wherein: The outside of the support table (45) is fixedly connected with a motor (46), the output end of the motor (46) is fixedly connected with the worm (43), the outside of the connecting shaft (41) is fixedly sleeved with a first bevel gear (44) which is used in cooperation with a second bevel gear (51).

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