Conveying line blanking device

Abstract

The utility model discloses a discharging device of a conveying line. The discharging device comprises a mounting frame plate, a conveying assembly and a buffering discharging assembly. The conveying assembly comprises a driving roller, a driven roller and a conveying belt, the driving roller and the driven roller are rotationally mounted on the mounting frame plate, and the conveying belt bypasses the rollers and is kept in a tight state. The buffering discharging assembly is located at the downstream end of the conveying assembly and is composed of a discharging plate, an adjusting sliding base, an adjusting lead screw and a connecting rod. The top end of the discharging plate is fixedly connected with the rotating ring, the rotating ring and the installation frame plate are coaxially installed, the adjusting sliding base and the adjusting lead screw are installed at the bottom of the installation frame plate, the adjusting lead screw is rotationally connected with the adjusting sliding base, and the two ends of the connecting rod are hinged to the discharging plate and the adjusting sliding base respectively. According to the device, through the precise conveying and buffering design, the safety and stability in the aluminum shell discharging process are improved, collision between the aluminum shells and the material receiving hopper is effectively avoided, the product quality is guaranteed, and remarkable economic benefits and wide application prospects are achieved.

Description

Technical Field

[0001] This utility model relates to the field of aluminum material conveying and unloading technology, specifically a conveyor line unloading device. Background Technology

[0002] In modern aluminum casing manufacturing, aluminum casings serve as crucial product components, widely used in various equipment such as battery cases and electronic product housings. The production process typically includes casting, stamping, and forming of the aluminum material. Among these processes, the handling and unloading of the aluminum casing are critical operational steps. This is especially true for aluminum casings with an outer diameter greater than 12.5 cm; as the product size and weight increase, the stability of handling and unloading during the production process becomes paramount.

[0003] However, existing aluminum shell production equipment and conveying devices often lack specially designed conveying and unloading mechanisms, leading to numerous problems during production. Typically, the aluminum shells output from the production equipment fall directly into the receiving hopper below. However, due to the significant weight of the aluminum shells and the lack of effective cushioning during unloading, impacts between the shells and the hopper are unavoidable. These collisions damage the surface of the aluminum shells, affecting their appearance and potentially even their subsequent performance. Utility Model Content

[0004] In view of the above-mentioned shortcomings in the existing technology, the purpose of this utility model is to provide a conveyor line feeding device, which solves the problems of unstable aluminum shell transmission, lack of protection during the feeding process, and angle adjustment in the existing technology.

[0005] The technical solution adopted by this utility model to achieve the above objectives is: a conveyor feeding device, including a mounting frame and a transmission component and a buffer feeding component assembled on the mounting frame, wherein the buffer feeding component is arranged at the downstream end of the transmission component.

[0006] The transmission assembly includes a drive roller, a driven roller, and a transmission belt. The drive roller and the driven roller are rotatably mounted in the mounting frame and arranged in parallel. The transmission belt is wrapped around the drive roller and the driven roller and is in a taut state.

[0007] The buffer feeding assembly includes a feeding plate, an adjusting slide, an adjusting screw, and a connecting rod. A rotating ring is fixedly connected to the top of the feeding plate. A rubber buffer layer A is laid on the upper surface of the feeding plate. The rotating ring is rotatably mounted on the mounting frame plate. The driving roller or driven roller is coaxially arranged with the rotating ring. The adjusting slide is slidably mounted on the bottom of the mounting frame plate. The adjusting screw is rotatably mounted on the bottom of the mounting frame plate and is screwed to the adjusting slide. The two ends of the connecting rod are respectively hinged to the feeding plate and the adjusting slide.

[0008] Based on the above technical solutions, in order to ensure that the mounting plate can be stably installed at the discharge end of the production equipment and to realize the stable installation and operation of the transmission components and buffer unloading components on it, the following technical solutions are provided.

[0009] The mounting frame includes a horizontal mounting plate and vertical mounting plates fixed to both sides of the horizontal mounting plate. A connecting bracket is fixed to the bottom of the horizontal mounting plate. The driving roller, driven roller, and rotating ring are all rotatably mounted on the two sets of vertical mounting plates. The transmission belt is arranged inside the two sets of vertical mounting plates.

[0010] The bottom of the mounting plate has a strip-shaped guide groove arranged along the length direction. The adjusting slide is slidably installed in the strip-shaped guide groove. The adjusting screw is rotatably installed at the bottom of the mounting plate and keeps parallel to the strip-shaped guide groove.

[0011] Based on the above technical solutions, in order to ensure the stable operation of the transmission components and the stable transmission on the aluminum shell, the following technical solutions are provided.

[0012] The transmission assembly also includes a drive motor and a support roller. A mounting pad is fixed to the outer wall of the mounting vertical plate. The drive motor is fixedly mounted on the mounting pad. The end of the drive roller is poweredly connected to the output shaft of the drive motor. The support roller includes multiple sets that are rotatably mounted on the mounting vertical plate and arranged between the drive roller and the driven roller. The support roller maintains contact with the inner surface of the transmission belt.

[0013] Based on the above technical solutions, in order to ensure that the transmission component can effectively support the processed aluminum shell and transmit it stably, and to prevent the aluminum shell from falling off both sides of the transmission belt during the transmission process, the following technical solutions are provided.

[0014] It also includes a protective assembly, which includes two sets of symmetrically arranged protective side plates and a buffer end plate fixedly connected between the two sets of protective side plates. The protective side plates are arranged above the mounting vertical plate and distributed on both sides of the transmission belt. The bottom of the protective side plate is provided with a fitting section that is parallel to the transmission belt, and the top of the protective side plate is provided with a mounting section. The buffer end plate is inclinedly arranged at the upstream end of the transmission assembly, and a rubber buffer layer B is laid on the buffer end plate.

[0015] The top of the mounting plate is provided with an outward-folding wing plate. Vertically arranged positioning bolts are passed through the wing plate and the mounting section. Positioning nuts for fixing the wing plate and the mounting section are screwed onto the positioning bolts.

[0016] Based on the above technical solutions, in order to prevent the aluminum shell from falling stably off the cutting plate and from falling off the sides of the cutting plate, to prevent the cutting plate from interfering with the installation horizontal plate during angle adjustment, and to prevent the bottom of the cutting plate from being stably supported by the receiving hopper, the following technical solutions are provided.

[0017] The feeding plate has upward-folding baffles fixed to both sides, and a support sleeve is rotatably installed at the bottom end of the feeding plate. The end of the mounting plate has a clearance notch, and the feeding plate is arranged in the clearance notch.

[0018] Based on the above technical solutions, in order to facilitate manual adjustment of the adjusting screw and achieve rapid adjustment of the inclination angle of the feed plate, the following technical solution is provided.

[0019] The buffer feeding assembly also includes a drive shaft rotatably mounted on the bottom of the mounting plate. The drive shaft is perpendicular to the adjusting screw. A reversing bevel gear A and a reversing bevel gear B are respectively fixed to the drive shaft and the adjusting screw. The reversing bevel gear A and the reversing bevel gear B are meshed. A hexagonal groove is provided at the end of the drive shaft.

[0020] The beneficial effects of this utility model are:

[0021] 1. Improves transmission stability and reduces the risk of aluminum shells deviating from the track and falling. The aluminum shells can be transported smoothly on the transmission components. The baffles and protective side plates effectively prevent the aluminum shells from falling from both sides, improving the stability and safety of the transmission process.

[0022] 2. Effective buffering prevents collisions between the aluminum shell and the receiving hopper, protecting the surface of the aluminum shell. The buffer rubber layer laid on the feeding plate and the buffer end plate can effectively buffer the aluminum shell when it is transferred between different parts, avoiding damage to the surface of the aluminum shell due to rigid collisions during the feeding process. This ensures the integrity of the aluminum shell during the feeding process, thereby improving product quality and production efficiency.

[0023] 3. Flexible angle adjustment: The tilt angle of the feeding plate can be precisely adjusted via the lead screw, while the clearance notch design on the mounting plate prevents spatial interference between the feeding plate and the mounting plate when adjusting the angle. This design allows the feeding device to smoothly adjust the feeding angle without affecting other components, meeting different production needs and improving the applicability and adjustment flexibility of the device.

[0024] In summary, this solution solves the problems of unstable aluminum shell transmission, lack of protection during the feeding process, and angle adjustment in the existing technology. It also greatly improves the safety, stability, and ease of operation of the aluminum shell feeding process, ultimately achieving improved aluminum shell product quality and optimized production efficiency. It has broad application prospects and significant economic benefits. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0027] Figure 3 This is a structural diagram of the protective components in their disassembled state;

[0028] Figure 4 A schematic diagram of the structure for mounting the transmission components on the mounting plate;

[0029] Figure 5 A schematic diagram of the structure for mounting the buffer feeding assembly on the mounting plate;

[0030] Figure 6 This is a structural diagram of the unloading plate in its disassembled state;

[0031] Figure 7 A schematic diagram of the adjustment screw and its associated components.

[0032] In the diagram: 11 Mounting horizontal plate, 111 Strip guide groove, 112 Clearance notch, 12 Mounting vertical plate, 121 Wing plate, 13 Connecting bracket, 14 Mounting pad, 21 Driving roller, 22 Driven roller, 23 Transmission belt, 24 Drive motor, 25 Support roller, 31 Feeding plate, 311 Rotating ring, 312 Rubber buffer layer A, 313 Baffle, 314 Support sleeve, 32 Adjusting slide, 33 Adjusting screw, 331 Reversing bevel gear B, 34 Connecting rod, 35 Drive shaft, 351 Reversing bevel gear A, 352 Hexagonal recess, 41 Protective side plate, 411 Fitting section, 412 Mounting section, 42 Buffer end plate, 421 Rubber buffer layer B, 422 Connecting strip, 51 Positioning bolt, 52 Positioning nut. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] Please see Figure 1-7 The conveyor feeding device includes a mounting plate and a transmission component and a buffer feeding component mounted on the mounting plate. The buffer feeding component is located at the downstream end of the transmission component.

[0035] The transmission assembly includes a drive roller 21, a driven roller 22, and a transmission belt 23. The drive roller 21 and the drive roller are rotatably mounted in the mounting frame and arranged in parallel. The transmission belt 23 is wrapped around the drive roller 21 and the drive roller and is in a taut state.

[0036] The buffer feeding assembly includes a feeding plate 31, an adjusting slide 32, an adjusting screw 33, and a connecting rod 34. A rotating ring 311 is fixedly connected to the top of the feeding plate 31. A rubber buffer layer A312 is laid on the upper surface of the feeding plate 31. The rotating ring 311 is rotatably mounted on the mounting plate. The driving roller 21 or the driven roller 22 is coaxially arranged with the rotating ring 311. The adjusting slide 32 is slidably mounted on the bottom of the mounting plate. The adjusting screw 33 is rotatably mounted on the bottom of the mounting plate and is screwed to the adjusting slide 32. The two ends of the connecting rod 34 are respectively hinged to the feeding plate 31 and the adjusting slide 32.

[0037] When producing aluminum shell products with an outer diameter of 12.5cm or more, the large weight of the products can cause damage to the product surface when they fall into the receiving hopper, affecting product quality. The conveyor line feeding device provided in this application can ensure the stability and safety of aluminum shell conveying and feeding.

[0038] The finished aluminum shells are transported via a conveyor assembly. A combination of a drive roller 21, a driven roller 22, and a conveyor belt 23 drives the aluminum shells to be stably transported downstream on the conveyor belt 23. There, they are received by a buffer unloading assembly. The drive adjusting screw 33 rotates to drive the adjusting slide 32 to run along a set straight travel trajectory. The connecting rod 34 then adjusts the inclination angle of the unloading plate 31 to ensure that the bottom of the unloading plate 31 can extend into the receiving hopper. When the aluminum shell enters the unloading plate 31 from the conveyor belt 23, the rubber buffer layer A312 on the unloading plate 31 and the set inclination angle ensure that the aluminum shell slides stably down the unloading plate 31 into the receiving hopper below. This effectively avoids collisions between the aluminum shell and the equipment during the unloading process, ensuring product quality.

[0039] To ensure that the mounting plate can be stably installed on the discharge end of the production equipment and that the transmission components and buffer unloading components can be stably installed and operated on it, the following technical solution is provided.

[0040] The mounting frame includes a horizontal mounting plate 11 and vertical mounting plates 12 fixed to both sides of the horizontal mounting plate 11. A connecting bracket 13 is fixed to the bottom of the horizontal mounting plate 11. The driving roller 21, the driven roller 22, and the rotating ring 311 are all rotatably mounted on the two sets of vertical mounting plates 12. The transmission belt 23 is arranged inside the two sets of vertical mounting plates 12.

[0041] The bottom of the mounting plate 11 has a strip-shaped guide groove 111 arranged along the length direction. The adjusting slide 32 is slidably installed in the strip-shaped guide groove 111. The adjusting screw 33 is rotatably installed at the bottom of the mounting plate 11 and keeps parallel to the strip-shaped guide groove 111.

[0042] The horizontal mounting plate 11 and the vertical mounting plate 12 are made of bent metal sheets to ensure the overall structural strength. The connecting bracket 13 is fixed to the bottom of the horizontal mounting plate 11 by welding. The connecting bracket 13 can fix the device to the discharge end of the production equipment and realize the stable support of the produced aluminum shell.

[0043] The strip guide groove 111 at the bottom of the mounting plate 11 ensures that the adjusting slide 32 is stably installed therein, and then the adjusting screw 33 drives it to slide stably along the length of the mounting plate, thereby adjusting the tilt angle of the feed plate 31.

[0044] To ensure the stable operation of the transmission components and the stable transmission on the aluminum shell, the following technical solutions are provided.

[0045] The transmission assembly also includes a drive motor 24 and a support roller 25. A mounting pad 14 is fixedly connected to the outer wall of the mounting vertical plate 12. The drive motor 24 is fixedly mounted on the mounting pad 14. The end of the drive roller 21 is poweredly connected to the output shaft of the drive motor 24. The support roller 25 includes multiple sets that are rotatably mounted on the mounting vertical plate 12 and arranged between the drive roller 21 and the driven roller 22. The support roller 25 maintains contact with the inner surface of the transmission belt 23.

[0046] The mounting plate 14 is fixed to the mounting vertical plate 12 by welding, which can ensure the stable installation of the drive motor 24. When the drive motor 24 runs, it drives the active roller 21 to run stably, so as to realize the stable operation of the transmission belt 23. The support roller 25 can stably support the transmission belt 23 to ensure the stable transmission of the aluminum shell on it.

[0047] To ensure that the transmission component can effectively support and stably transmit the finished aluminum shell, and to prevent the aluminum shell from falling off both sides of the transmission belt 23 during transmission, the following technical solution is provided.

[0048] It also includes a protective assembly, which includes two sets of symmetrically arranged protective side plates 41 and a buffer end plate 42 fixedly connected between the two sets of protective side plates 41. The protective side plates 41 are arranged above the mounting vertical plate 12 and distributed on both sides of the transmission belt 23. The bottom of the protective side plate 41 is provided with a fitting section 411 that is parallel to the transmission belt 23, and the top of the protective side plate 41 is provided with a mounting section 412. The buffer end plate 42 is inclinedly arranged at the upstream end of the transmission assembly, and a rubber buffer layer B421 is laid on the buffer end plate 42.

[0049] The top of the mounting plate 12 is provided with an outwardly folding wing plate 121. Vertically arranged positioning bolts 51 are passed through the wing plate 121 and the mounting section 412. Positioning nuts 52 for fixing the wing plate 121 and the mounting section 412 are screwed onto the positioning bolts 51.

[0050] The protective side plate 41 and its bonding section 411 and mounting section 412 are all made of bent metal sheet. The protective side plate 41 is arranged in an inward tilting posture, that is, the space enclosed by the two sets of protective side plates 41 is an inverted trapezoidal structure, which can ensure that the aluminum shell is stably transmitted in it and will not fall off from both sides of the transmission component.

[0051] A certain gap is provided between the bonding section 411 at the bottom of the protective side plate 41 and the transmission belt 23 to prevent the transmission belt 23 from rubbing against the bonding section 411 during operation and affecting its service life.

[0052] The buffer end plate 42 is fixed between the two sets of protective side plates 41 by welding, and the outer edge of the buffer end plate 42 is in close contact with the inner wall of the protective side plate 41. The rubber buffer layer B421 provided on it can play a buffering role when receiving the aluminum shell output from the production equipment, avoiding collision of the aluminum shell, and allowing the aluminum shell to fall between the two sets of protective side plates 41 for stable transmission by the transmission component.

[0053] The top of the buffer end plate 42 is also fixed with a connecting strip 422 that fits in close contact with the mounting section 412 of the protective side plate 41, and the connecting strip 422 is welded and fixed to the mounting section 412.

[0054] When fixing the wing plate 121 and the mounting section 412 with the positioning bolts 51 and the positioning nuts 52, the head of the positioning bolt 51 is in contact with the lower surface of the wing plate 121, and one set of positioning nuts 52 is in contact with the upper surface of the wing plate 121, so as to fix the positioning bolts 51 on the wing plate 121. The other two sets of nuts are in contact with the upper and lower surfaces of the mounting section 412 respectively, so as to fix the mounting section 412, so as to ensure that the protective side plate 41 is stably installed on the mounting frame plate at a specific assembly height.

[0055] To prevent the aluminum shell from falling stably onto the feeding plate 31 and from falling off either side of the feeding plate 31, to prevent spatial movement interference between the feeding plate 31 and the mounting horizontal plate 11 when the angle is adjusted, and to prevent the bottom of the feeding plate 31 from being stably supported by the receiving hopper, the following technical solutions are provided.

[0056] The two sides of the feeding plate 31 are fixedly connected with upward-folding baffles 313, and the bottom end of the feeding plate 31 is rotatably installed with a support sleeve 314. The end of the mounting plate 11 is provided with a clearance notch 112, and the feeding plate 31 is arranged in the clearance notch 112.

[0057] The top of the baffle 313 is provided with an arc-shaped section, which is arranged on the outside of the two sets of protective side plates 41, so as to ensure that the aluminum shell is always protected by the protective side plates 41 and the baffle 313 during the transmission process.

[0058] The support sleeve 314 is made of rubber and has a certain degree of elasticity. It can directly contact the receiving hopper to avoid rigid contact between the receiving hopper and the discharge plate 31 during the opening, closing and replacement of the receiving hopper, which would cause damage to the discharge plate 31.

[0059] The notch 112 on the mounting plate 11 can prevent the material feed plate 31 from interfering with the mounting plate 11 when the tilt angle is adjusted.

[0060] To facilitate manual adjustment of the adjusting screw 33 and achieve rapid adjustment of the tilt angle of the feed plate 31, the following technical solution is provided.

[0061] The buffer feeding assembly also includes a drive shaft 35 rotatably mounted on the bottom of the mounting plate 11. The drive shaft 35 and the adjusting screw 33 are vertically distributed. A reversing bevel gear A351 and a reversing bevel gear B331 are respectively fixed on the drive shaft 35 and the adjusting screw 33. The reversing bevel gear A351 and the reversing bevel gear B331 are meshed. A hexagonal groove 352 is provided at the end of the drive shaft 35.

[0062] The hexagonal groove 352 on the drive shaft 35 is compatible with a hexagonal wrench. The drive shaft 35 can be operated and driven to rotate from the side of the mounting plate 11 by the hexagonal wrench. The combination of the reversing bevel gear A351 and the reversing bevel gear B331 drives the adjusting screw 33 to rotate stably, so as to facilitate the adjustment of the tilt posture of the unloading plate 31.

[0063] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0064] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A conveyor line feeding device, characterized in that: It includes a mounting plate and a transmission assembly and a buffer unloading assembly mounted on the mounting plate, wherein the buffer unloading assembly is arranged at the downstream end of the transmission assembly; The transmission assembly includes a drive roller (21), a driven roller (22), and a transmission belt (23). The drive roller (21) and the drive roller are rotatably mounted in the mounting frame and arranged in parallel. The transmission belt (23) is wrapped around the drive roller (21) and the drive roller and is in a taut state. The buffer feeding assembly includes a feeding plate (31), an adjusting slide (32), an adjusting screw (33), and a connecting rod (34). A rotating ring (311) is fixedly connected to the top of the feeding plate (31). A rubber buffer layer A (312) is laid on the upper surface of the feeding plate (31). The rotating ring (311) is rotatably mounted on the mounting frame plate. The driving roller (21) or driven roller (22) is coaxially arranged with the rotating ring (311). The adjusting slide (32) is slidably mounted on the bottom of the mounting frame plate. The adjusting screw (33) is rotatably mounted on the bottom of the mounting frame plate and is screwed to the adjusting slide (32). The two ends of the connecting rod (34) are respectively hinged to the feeding plate (31) and the adjusting slide (32).

2. The conveyor line feeding device according to claim 1, characterized in that: The mounting frame includes a mounting horizontal plate (11) and mounting vertical plates (12) fixed to both sides of the mounting horizontal plate (11). A connecting bracket (13) is fixed to the bottom of the mounting horizontal plate (11). The driving roller (21), the driven roller (22), and the rotating ring (311) are all rotatably mounted on the two sets of mounting vertical plates (12). The transmission belt (23) is arranged inside the two sets of mounting vertical plates (12). The bottom of the mounting plate (11) is provided with a strip guide groove (111) arranged along the length direction. The adjusting slide (32) is slidably installed in the strip guide groove (111). The adjusting screw (33) is rotatably installed at the bottom of the mounting plate (11) and keeps parallel to the strip guide groove (111).

3. The conveyor line feeding device according to claim 2, characterized in that: The transmission assembly also includes a drive motor (24) and a support roller (25). A mounting pad (14) is fixedly connected to the outer wall of the mounting vertical plate (12). The drive motor (24) is fixedly mounted on the mounting pad (14). The end of the drive roller (21) is poweredly connected to the output shaft of the drive motor (24). The support roller (25) includes multiple sets rotatably mounted on the mounting vertical plate (12) and arranged between the drive roller (21) and the driven roller (22). The support roller (25) abuts against the inner surface of the transmission belt (23).

4. The conveyor line feeding device according to claim 2, characterized in that: It also includes a protective assembly, which includes two sets of symmetrically arranged protective side plates (41) and a buffer end plate (42) fixedly connected between the two sets of protective side plates (41). The protective side plates (41) are arranged above the mounting vertical plate (12) and distributed on both sides of the transmission belt (23). The bottom of the protective side plate (41) is provided with a fitting section (411) that is parallel to the transmission belt (23). The top of the protective side plate (41) is provided with a mounting section (412). The buffer end plate (42) is inclinedly arranged at the upstream end of the transmission assembly. A rubber buffer layer B (421) is laid on the buffer end plate (42). The top of the mounting plate (12) is provided with an outwardly folded wing plate (121). Vertically arranged positioning bolts (51) are passed through the wing plate (121) and the mounting section (412). Positioning nuts (52) for fixing the wing plate (121) and the mounting section (412) are screwed onto the positioning bolts (51).

5. The conveyor line feeding device according to claim 2, characterized in that: The feeding plate (31) is fixedly connected to both sides with upward-folding baffles (313), and a support sleeve (314) is rotatably installed at the bottom end of the feeding plate (31). The end of the mounting plate (11) is provided with a clearance notch (112), and the feeding plate (31) is arranged in the clearance notch (112).

6. The conveyor line feeding device according to claim 2, characterized in that: The buffer feeding assembly also includes a drive shaft (35) rotatably mounted on the bottom of the mounting plate (11). The drive shaft (35) is perpendicular to the adjusting screw (33). A reversing bevel gear A (351) and a reversing bevel gear B (331) are respectively fixed on the drive shaft (35) and the adjusting screw (33). The reversing bevel gear A (351) and the reversing bevel gear B (331) are meshed. A hexagonal groove (352) is provided at the end of the drive shaft (35).

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