Motor-driven double-guide-rail profiling device of cold roll forming machine

Abstract

The invention discloses a motor-driven double-guide-rail profiling device of a cold roll forming machine, and relates to the technical field of steel plate machining, the motor-driven double-guide-rail profiling device comprises a main frame, a plurality of guide rails are arranged in the main frame, a mounting seat is arranged in the main frame in a sliding mode, a plurality of sliding blocks are arranged on the outer side of the mounting seat, and the sliding blocks are arranged on the guide rails. The sliding blocks are connected with the guide rails in a sliding mode, profiling dies are arranged between the bottom of the installation base and the main frame, the metal plate profiling device further comprises a driving mechanism used for driving the installation base to move up and down in the main frame, and through the structural design, the two profiling dies are meshed to conduct profiling treatment on a metal plate. In addition, the sliding block is matched with the guide rail, the effects of reciprocating lifting, stable guiding and efficient and rapid profiling are achieved, a hydraulic system is replaced by the driving mechanism, accurate control and stable application of force are achieved, guide column guiding is replaced by rigid guide rail and sliding block multi-point guiding, and high unbalance loading resistance and movement stability are provided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel plate processing, and more particularly to a motor-driven double-guide-rail profiling device of a cold roll forming machine. BACKGROUND

[0002] A tile press (also known as a cold roll forming machine) mainly consists of processes such as feeding, forming, post-forming profiling, and post-forming cutting, and is used for producing color plates. The finished product has a smooth and beautiful appearance, uniform paint lines, high strength, and is durable, and is widely used in industrial and civil buildings, such as factory buildings, warehouses, gymnasiums, exhibition halls, and theaters, for roofing and walling.

[0003] As is known, the profiling part of the tile press is traditionally driven by a hydraulic system and an oil cylinder, and is guided and controlled by guide columns, so that the upper and lower profiling dies are engaged to complete the profiling. However, due to the great force of the hydraulic system, there is instability in the working process, which can easily cause a guide error when the upper profiling die is descending. This error can cause the metal plate being pressed to be scratched at the step, affecting the appearance and use performance, and even possibly causing the plate to deform.

[0004] Based on this, the present application provides a motor-driven double-guide-rail profiling device of a cold roll forming machine. SUMMARY

[0005] To solve the problems raised in the background art, the present application provides a motor-driven double-guide-rail profiling device of a cold roll forming machine, two profiling dies are engaged to profile the metal plate, and the sliding block cooperates with the guide rail to have the effects of reciprocating lifting, stable guiding, and high-efficiency and fast profiling. The driving mechanism replaces the hydraulic system to realize accurate control and smooth application of force, and the rigid guide rail + sliding block multi-point guiding replaces the guide column guiding to provide high anti-unbalanced load capacity and motion stability.

[0006] The motor-driven double-guide-rail profiling device of a cold roll forming machine provided by the present application adopts the following technical solution:

[0007] The utility model provides a motor drive double guide rail profiled device of cold bending forming machine, including the inside of main frame is provided with a plurality of guide rails, the inside slide of main frame is provided with mounting seat, the outside of mounting seat is provided with a plurality of sliding blocks, the sliding block is connected with the guide rail sliding, the bottom of mounting seat is provided with the profiled die between the main frame, still include drive mechanism for driving the mounting seat moves up and down in the main frame, drive mechanism includes driving part, pivot, four bearings, two eccentric discs and two connecting rods, four bearings all rotationally arranged in the top of main frame, and two bearings are a group, the pivot is threaded between four bearings, two eccentric discs are eccentrically arranged on the pivot, the eccentric disc is arranged between two bearings, and two eccentric discs are symmetrically arranged, the bottom of two connecting rods is hingedly arranged in the top of mounting seat, the top of connecting rod is connected with eccentric disc through sleeve, and driving part is arranged on the top of main frame for driving the pivot rotation.

[0008] Preferably, the driving part is a servo motor group.

[0009] Preferably, the bottom of the mounting seat and the main frame are provided with a mounting seat for connecting the profiled die.

[0010] Preferably, the mounting seat includes a connecting box, a shielding plate and a plurality of extrusion pieces; the shielding plate is slidably arranged on the front of the connecting box, and each extrusion piece is arranged in the connecting box; the profiled die is arranged between the extrusion piece and the shielding plate.

[0011] Preferably, the extrusion piece includes a wedge, a horizontal bar and a plug rod; a sliding hole is formed in the back of the connecting box, the wedge is slidably arranged in the sliding hole through sliding pads, the horizontal bar is slidably inserted into the connecting box through two movable rods, the plug rod is arranged on the side of the horizontal bar, a side end of the plug rod is rotatably provided with a ball, the ball is in contact with the side of the wedge, the side ends of the two plug rods are arranged outside the connecting box, and a spring is arranged in the connecting box between the plug rod and the side end of the plug rod.

[0012] Preferably, the sliding pads are connected by a connecting strip, a threaded rod is rotatably arranged on the side of the connecting box, and a side end of the threaded rod is rotatably connected with a side of the sliding pad.

[0013] Preferably, a gear slot is formed in the side of the shielding plate, a gear shaft is rotatably arranged on the top of the connecting box, and the gear shaft is in meshing connection with the gear slot.

[0014] Preferably, the top of the connecting strip is provided with a rack plate, the side of the connecting box is rotatably provided with a gear, the gear is in meshing connection with the rack plate, the top of the connecting box is provided with a transmission shaft, the transmission shaft is in transmission connection with the gear shaft through a bevel gear set, and the transmission shaft is in transmission connection with the gear through a transmission belt.

[0015] In summary, the present application has the following beneficial technical effects:

[0016] The metal plate is conveyed between the two compression molds, the driving member drives the rotating shaft to rotate, so that the two eccentric discs rotate eccentrically, the connecting rods are driven to move downward, the two connecting rods move downward synchronously, the mounting seat moves downward in the main frame, so that the compression mold at the bottom of the mounting seat contacts the metal plate and contacts the other compression mold, and the compression and shearing of the metal plate are completed. Through the structure design, the two compression molds engage the metal plate for compression molding, the sliding block cooperates with the guide rail, has the effects of reciprocating lifting, stable guiding and high-efficiency and rapid compression, the driving mechanism replaces the hydraulic system, realizes accurate control and stable application of force, and the rigid guide rail+sliding block multi-point guiding replaces the guide column guiding, and higher anti-unbalanced load capacity and motion stability are provided.

[0017] The above summary is only for the purpose of the description and is not intended to limit in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features will be readily apparent to those skilled in the art by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a structural schematic view of a motor-driven double-guide-rail compression device of a cold bending forming machine in an embodiment of the present application;

[0019] Figure 2 is a structural schematic view of the front of a motor-driven double-guide-rail compression device of a cold bending forming machine in an embodiment of the present application;

[0020] Figure 3 is a structural schematic view of the side of a motor-driven double-guide-rail compression device of a cold bending forming machine in an embodiment of the present application;

[0021] Figure 4 is a structural schematic view of the top of a motor-driven double-guide-rail compression device of a cold bending forming machine in an embodiment of the present application;

[0022] Figure 5 is a structural schematic view of a driving mechanism in an embodiment of the present application;

[0023] Figure 6 is a structural schematic view of an assembly seat in an embodiment of the present application;

[0024] Figure 7 is a structural schematic diagram of the inside of the assembly seat in the embodiment of the present application;

[0025] Figure 8 is a structural schematic diagram of the extrusion part in the embodiment of the present application;

[0026] Figure 9 is a structural schematic diagram of the front of the extrusion part in the embodiment of the present application;

[0027] Figure 10 is a structural schematic diagram of the side of the extrusion part in the embodiment of the present application;

[0028] Figure 11 is a structural schematic diagram of the shielding plate closed in the embodiment of the present application;

[0029] Figure 12 is a structural schematic diagram of the shielding plate unfolded in the embodiment of the present application;

[0030] Figure 13 is a structural schematic diagram of the transmission shaft connection in the embodiment of the present application.

[0031] BRIEF DESCRIPTION OF DRAWINGS 1, main frame; 2, guide rail; 3, mounting seat; 4, sliding block; 5, profile die; 6, driving mechanism; 600, driving part; 601, rotating shaft; 602, bearing; 603, eccentric disc; 604, connecting rod; 7, assembly seat; 700, connecting box; 701, shielding plate; 702, wedge block; 703, horizontal bar; 704, insertion rod; 705, sliding hole; 706, sliding pad; 707, moving rod; 708, spring; 709, connecting strip; 710, threaded rod; 711, gear groove; 712, gear shaft; 713, rack plate; 714, gear; 715, bevel gear set. DETAILED DESCRIPTION

[0032] The following will be described in detail in combination with the accompanying Figures 1 to 13 The present application will be further described in detail.

[0033] It should be noted that the drawings are schematic and not drawn to scale. The relative dimensions and proportions of the parts shown in the drawings have been exaggerated or reduced, for the sake of clarity and convenience in the drawings, and any dimensions are merely exemplary and not limiting. In addition, the same reference numerals are used for the same structures, elements or accessories appearing in two or more drawings to embody similar features.

[0034] Example One

[0035] The embodiment of the present application discloses a motor-driven double guide rail profile device of a cold bending forming machine. Referring to Figures 1 to 5A motor-driven double-guide rail profiling device of a cold roll forming machine includes a main frame 1, a plurality of guide rails 2 are arranged inside the main frame 1, a mounting seat 3 is slidingly arranged inside the main frame 1, a plurality of sliders 4 are arranged on the outside of the mounting seat 3, the sliders 4 are slidably connected to the guide rails 2, a profiling mold 5 is arranged between the bottom of the mounting seat 3 and the main frame 1, and also includes a driving mechanism 6 for driving the mounting seat 3 to move up and down in the main frame 1.

[0036] like Figure 5 As shown, the driving mechanism 6 includes a driving member 600, a rotating shaft 601, four bearings 602, two eccentric disks 603 and two connecting rods 604; the four bearings 602 are all rotatably set on the top of the main frame 1, and two bearings 602 are a group, the rotating shaft 601 is passed through the four bearings 602, the two eccentric disks 603 are eccentrically set on the rotating shaft 601, the eccentric disks 603 are arranged between the two bearings 602, and the two eccentric disks 603 are symmetrically set, the bottom ends of the two connecting rods 604 are hingedly set on the top of the mounting seat 3, the top end of the connecting rod 604 is connected to the eccentric disk 603 through a sleeve, and the driving member 600 is set on the top of the main frame 1 for driving the rotating shaft 601 to rotate.

[0037] Specifically, the driving member 600 is a servo motor group, which includes a motor arranged on the top of the main frame 1. The output shaft of the motor is provided with a driving gear, and a driven gear is provided in the middle of the rotating shaft 601. The driven gear is meshed with the driving gear.

[0038] Specifically, the metal sheet is transported between the two pressing dies 5, and the rotating shaft 601 is driven to rotate by the driving member 600, thereby causing the two eccentric disks 603 to rotate eccentrically, thereby driving the connecting rod 604 to move downward, and the two connecting rods 604 move downward synchronously, driving the mounting base 3 to move downward in the main frame 1, thereby causing the pressing die 5 at the bottom of the mounting base 3 to contact the metal sheet and contact the other pressing die 5, completing the pressing and shearing of the metal sheet.

[0039] Through this structural design, the metal sheet is profiled by meshing the two profiling dies 5, and the slider 4 cooperates with the guide rail 2 to have the effects of reciprocating lifting and lowering, stable guiding and efficient and rapid profiling. The driving mechanism 6 replaces the hydraulic system to achieve precise control and smooth application of force. The rigid guide rail 2 + slider 4 multi-point guidance replaces the guide column guidance, providing higher anti-eccentricity ability and movement stability.

[0040] Example 2

[0041] This embodiment is further optimized based on the above embodiment 1, and the parts that are the same as the above technical solutions will not be repeated here. Figure 6As shown, in order to better realize the present application, the following arrangement is particularly adopted, in the embodiment, the bottom of the mounting seat 3 and the main frame 1 are both provided with an assembling seat 7 for connecting the compression mold 5.

[0042] As shown in Figure 7 , Figure 8 and Figure 9 , the assembling seat 7 comprises a connecting box 700, a shielding plate 701 and a plurality of extrusion pieces; the shielding plate 701 is slidingly arranged on the front face of the connecting box 700, and each extrusion piece is arranged inside the connecting box 700, and the compression mold 5 is arranged between the extrusion piece and the shielding plate 701.

[0043] As shown in Figure 9 and Figure 10 , the extrusion piece comprises a wedge block 702, a horizontal bar 703 and a plug rod 704; the back face of the connecting box 700 is provided with a sliding hole 705, the wedge block 702 is slidingly arranged in the sliding hole 705 through sliding pads 706, the horizontal bar 703 is slidingly inserted in the connecting box 700 through two movable rods 707, the plug rod 704 is arranged on the side face of the horizontal bar 703, a side end of the plug rod 704 is rotatably provided with a ball, the ball is in contact with the side face of the wedge block 702, the side ends of the two plug rods 704 are arranged outside the connecting box 700, a spring 708 is arranged in the middle part of the plug rod 704 between the connecting box 700 and the side end of the plug rod 704, and the side face of the shielding plate 701 is provided with a hole body corresponding to the plug rod 704.

[0044] As shown in Figure 11 , the sliding pads 706 are connected through a connecting strip 709, and the side face of the connecting box 700 is rotatably provided with a threaded rod 710, and a side end of the threaded rod 710 is rotatably connected with the side face of one sliding pad 706.

[0045] Specifically, when disassembling the compression mold 5, the threaded rod 710 is rotated to drive one sliding pad 706 to move in the corresponding sliding hole 705, the sliding pads 706 are connected through the connecting strip 709, so that the sliding pads 706 move synchronously, so that the wedge blocks 702 move synchronously, so that the corresponding plug rods 704 are no longer limited by the wedge blocks 702, the spring 708 is stretched to drive the plug rods 704 to move, the plug rods 704 are separated from the hole body on the shielding plate 701, then the shielding plate 701 is pushed by the staff, the compression mold 5 is exposed, and the compression mold 5 is separated from the plug rods 704, and the same is true when assembling the compression mold 5, only the perforations on the compression mold 5 are inserted into the side ends of the corresponding plug rods 704, then the shielding plate 701 is pushed down, then the threaded rod 710 is rotated to drive the wedge blocks 702 to move synchronously, so that the corresponding plug rods 704 are lifted, so that the connection between the plug rods 704 and the shielding plate 701 is completed, and the assembly of the compression mold 5 is completed.

[0046] Through the structural design, the staff can quickly replace the different tooth profiled die 5, and through single-point operation to drive the multi-wedge block 702 linkage mechanism, cooperate with the spring 708 to assist the locking and separation of the plug rod 704 and the shielding plate 701, solve the problems of long mold changing time, large labor intensity, uneven locking force, many safety hazards and the like existing in the traditional bolt fixed mold mode.

[0047] Embodiment three

[0048] This embodiment is further optimized on the basis of the above-mentioned embodiment two, and the same parts as the foregoing technical solutions will not be repeated here, such as Figure 13 As shown in the figure, in order to better realize the present application, the following setting mode is particularly adopted, in this embodiment, the side surface of the shielding plate 701 is provided with a tooth groove 711, and the top of the connecting box 700 is rotatably provided with a tooth shaft 712, the tooth shaft 712 is engagedly connected with the tooth groove 711.

[0049] As shown in the figure, the top of the connecting strip 709 is provided with a rack plate 713, the side surface of the connecting box 700 is rotatably provided with a gear 714, the gear 714 is engagedly connected with the rack plate 713, the top of the connecting box 700 is provided with a transmission shaft, the transmission shaft is drivingly connected with the tooth shaft 712 through a bevel gear set 715, and the transmission shaft is drivingly connected with the gear 714 through a transmission belt. Figure 13 Specifically, the profiled die 5 is disassembled: rotate the threaded rod 710, this action drives all the wedge blocks 702 to move synchronously, in the initial stage of the movement of the wedge block 702, the restriction on the plug rod 704 is released, the spring 708 pushes the plug rod 704 to retract, so that it is withdrawn from the hole body of the shielding plate 701, the mold unlocking is completed, the wedge block 702 continues to move (through the connecting strip 709) to drive the rack plate 713 to move synchronously, the rotation of the gear 714 drives the transmission shaft to rotate through the transmission belt, the transmission shaft changes the transmission direction through the bevel gear set 715, drives the tooth shaft 712 to rotate, the tooth shaft 712 is engaged with the tooth groove 711 on the side surface of the shielding plate 701, drives the shielding plate 701 to automatically translate and open, completely exposes the profiled die 5 below, at this time, the staff can conveniently disassemble the profiled die 5.

[0050]

[0051] ​The new profiled die 5 is placed in position, the perforations on the profiled die 5 are sleeved on the corresponding end of the insertion rod 704, the threaded rod 710 is reversely rotated, the wedge-shaped block 702 is first reversely moved (the connecting strip 709 drives the gear rack plate 713 to reversely move synchronously), the gear rack plate 713 reversely moves initially, is still engaged with the gear wheel 714, drives the transmission member to reversely work, the transmission member drives the shielding plate 701 to automatically translate and close through the gear shaft 712, when the shielding plate 701 is completely closed in position, the gear rack plate 713 is just moved to the position of being disengaged from the gear wheel 714, the subsequent movement of the shielding plate 701 is stopped, at this time, the end of the insertion rod 704 has not been inserted into the hole body of the shielding plate 701, the threaded rod 710 is continuously rotated, the wedge-shaped block 702 continuously moves, starts to push the insertion rod 704 to move to the direction of the shielding plate 701 to overcome the resistance of the spring 708, the insertion rod 704 pushes the profiled die 5 to be tightly positioned, the end of the insertion rod 704 is finally inserted into the corresponding hole body of the shielding plate 701 which has been closed, and the firm locking of the die is completed.

[0052] Through the structure design, the shielding plate 701 does not need to be pushed by the staff, when the profiled die 5 is disassembled and assembled, only the threaded rod 710 needs to be rotated, the unlocking, plate moving and locking (or reverse) whole set of die changing actions are automatically completed, the link of manually pushing and pulling the heavy shielding plate 701 is completely eliminated, the mechanical forced linkage guarantees the correct sequence and integrity of the operation steps, and the situation that the insertion rod 704 collides with the shielding plate 701 is avoided.

[0053] The standard parts used in the application can be purchased from the market, the special-shaped parts can be customized according to the description and the drawings, the specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art, the machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail here.

[0054] In the description of the application, the terms "first" and "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. The meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0055] In the present application, unless specifically defined otherwise and limited, the terms "mount", "connect", "connection", "fixed", and the like, should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] In the present application, unless specifically defined otherwise and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be indirectly in contact through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0057] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

[0058] In the drawings of the embodiments of the present application, only the structures related to the embodiments of the present application are involved, and other structures can be referred to the general design. In the case of no conflict, the same embodiment and different embodiments of the present application can be combined with each other.

[0059] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can modify the technical solutions described in the foregoing embodiments, or make equivalent replacement to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A motor-driven double-guide rail press-forming device for a cold roll forming machine, comprising a main frame (1), a plurality of guide rails (2) are provided inside the main frame (1), a mounting seat (3) is slidably provided inside the main frame (1), a plurality of sliders (4) are provided on the outside of the mounting seat (3), the sliders (4) are slidably connected to the guide rails (2), a press-forming die (5) is provided between the bottom of the mounting seat (3) and the main frame (1), and is characterized in that: It also includes a driving mechanism (6) for driving the mounting seat (3) to move up and down in the main frame (1); The driving mechanism (6) comprises: A driving member (600), a rotating shaft (601), four bearings (602), two eccentric discs (603) and two connecting rods (604); The four bearings (602) are all rotatably arranged on the top of the main frame (1), and two of the bearings (602) form a group. The rotating shaft (601) is passed through the four bearings (602). The two eccentric disks (603) are eccentrically arranged on the rotating shaft (601). The eccentric disks (603) are arranged between the two bearings (602), and the two eccentric disks (603) are symmetrically arranged. The bottom ends of the two connecting rods (604) are hingedly arranged on the top of the mounting seat (3). The top end of the connecting rod (604) is connected to the eccentric disk (603) through a sleeve. The driving member (600) is arranged on the top of the main frame (1) for driving the rotating shaft (601) to rotate.

2. The motor-driven double-guide rail profiling device of a roll forming machine according to claim 1, characterized in that: The driving member (600) is a servo motor group.

3. The motor-driven double-guide rail profiling device of a roll forming machine according to claim 1, characterized in that: An assembly seat (7) is provided at the bottom of the mounting seat (3) and inside the main frame (1) for connecting the pressing die (5).

4. The motor-driven double-guide rail profiling device for a roll forming machine according to claim 3, characterized in that: The assembly seat (7) comprises: A connection box (700), a baffle (701) and a plurality of extrusions; The shielding plate (701) is slidably arranged on the front of the connection box (700), each of the extrusion members is arranged inside the connection box (700), and the pressing mold (5) is arranged between the extrusion members and the shielding plate (701).

5. The motor-driven double-guide rail profiling device for a roll forming machine according to claim 4, characterized in that: The extrusion comprises: Wedge-shaped block (702), horizontal bar (703) and insertion rod (704); The back of the connection box (700) is provided with a sliding hole (705), the wedge block (702) is slidably arranged in the sliding hole (705) through a sliding pad (706), the horizontal bar (703) is slidably inserted into the connection box (700) through two movable rods (707), the insertion rod (704) is arranged on the side of the horizontal bar (703), and the side end of the insertion rod (704) is rotatably provided with a ball, and the ball contacts the side of the wedge block (702), the side ends of the two insertion rods (704) are arranged outside the connection box (700), and the middle part of the insertion rod (704) is located between the connection box (700) and the side end of the insertion rod (704) and is penetrated by a spring (708).

6. The motor-driven double-guide rail profiling device for a roll forming machine according to claim 5, characterized in that: Each of the sliding pads (706) is connected via a connecting strip (709), and a threaded rod (710) is rotatably provided on the side of the connecting box (700), and the side end of the threaded rod (710) is rotatably connected to the side of one of the sliding pads (706).

7. The motor-driven double-guide rail profiling device for a roll forming machine according to claim 4, characterized in that: A tooth groove (711) is provided on the side of the shielding plate (701), and a gear shaft (712) is rotatably provided on the top of the connection box (700), and the gear shaft (712) is meshed and connected with the tooth groove (711).

8. The motor-driven double-guide rail profiling device for a roll forming machine according to claim 6 or 7, characterized in that: A rack plate (713) is provided on the top of the connecting bar (709), a gear (714) is rotatably provided on the side of the connecting box (700), the gear (714) is meshedly connected with the rack plate (713), a transmission shaft is provided on the top of the connecting box (700), the transmission shaft is transmission-connected to the gear shaft (712) through a bevel gear set (715), and the transmission shaft is transmission-connected to the gear (714) through a transmission belt.

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