Compound double needle head module of a quilting machine

Abstract

The utility model relates to a kind of composite double needle machine head module of quilting machine, it is to solve the technical problem that the linkage effect of needle bar and main shaft power clutch device, and needle bar and driving slider in existing similar products is not good enough.The cam mechanism in the head box assembly of the module drives the needle bar in needle bar box assembly inside two sides two two symmetrical needle bar up-down reciprocating motion by big connecting rod;Its gist is that the needle bar positioning block one end of needle bar in needle bar box assembly wedge head is inserted into the guide slot of the one side of driving block simultaneously, the driving edge of the one side of driving block is respectively abutted with the small bearing of electromagnet shaft end, the recess of the one side of the bottom of driving slider is wedged with the male rail of the one side of the bottom of driven driving slider, the driving seat of the one side of the top of driving slider is connected with the one end of big connecting rod of the one side of head box assembly;The driving edge of the one side of driving block is respectively in right trapezoidal projection, and the small bearing of electromagnet shaft end is abutted with the end angle side of driving edge.

Description

Technical Field

[0001] This utility model relates to the head of a quilting and embroidery machine, specifically a composite double-needle head module for a quilting and embroidery machine. Background Technology

[0002] A quilting machine, also known as a quilting sewing machine, is a textile machine used to sew linear patterns on the surface of mattresses, bedspreads, quilts, etc. Quilting machines used for sewing quilts can be divided into two categories according to the number of stitches and the number of patterns they can sew: straight quilting machines and computerized quilting machines. Straight quilting machines are usually available in 7-needle, 9-needle, and 11-needle configurations, and these machines can only sew straight lines. Computerized quilting machines are designed with a single needle and use a computer visual interface to control the machine's movement to achieve the sewing of patterns. These types of quilting and embroidery machines are generally assembled through head modules. Some of these head modules adopt a double-row multi-head structure design, such as application number 201110178479.4 disclosed in Chinese patent literature, authorized announcement date 2012.09.05, invention title "Double-sided double-row quilting and embroidery integrated machine"; however, in the above-mentioned products and similar products, the linkage effect between the needle bar and the main shaft power clutch device of the head module, as well as the linkage effect between the needle bar and the drive slider, is not good. In particular, there is a non-rigid (i.e. flexible) connection between the opening and closing direction of the clutch device and the linkage components, which can easily lead to unstable power transmission. Summary of the Invention

[0003] To overcome the above-mentioned shortcomings, the purpose of this utility model is to provide a composite double-needle head module for quilting and embroidery machines, thereby solving the technical problem of poor linkage between the needle bar and the main shaft power clutch device, and between the needle bar and the drive slider in existing similar products. In particular, there is a non-rigid (i.e., flexible) connection between the opening and closing direction of the clutch device and the linkage components, which easily leads to unstable power transmission. This objective is achieved through the following technical solution.

[0004] A composite double-needle head module for a quilting and embroidery machine includes a head box assembly, a needle bar box assembly, and a shuttle box assembly. The cam mechanism of the head box assembly drives the needle bars symmetrically arranged on both sides of the needle bar box assembly to reciprocate up and down via a connecting rod. Two needle bars on one side of the needle bar box assembly are arranged as a group within the symmetrically arranged needle bar boxes on both sides. Below each needle bar corresponds to a shuttle mechanism in the shuttle box assembly. The key structural design feature is that each needle bar in the needle bar box assembly has a guide rod corresponding to its corresponding needle bar. Each guide rod has a drive block that is reset by a torsion spring. Two guide rods on one side are symmetrically arranged on both sides of the active drive slider within one needle bar box, and two guide rods on the other side are symmetrically arranged on both sides of the driven drive slider within the other needle bar box. The guide rods on both sides pass through the drive blocks simultaneously arranged on both sides of the active and driven drive sliders. The top end of the rod is connected to the top ends of the active drive slider and the driven drive slider, respectively, and the bottom ends of the guide rods on both sides are connected to the needle bar boxes on both sides. The needle bar positioning block at one end of the needle bar is inserted into the guide groove on one side of the drive block, while the protruding drive edge on one side of the drive block abuts against the small bearing at the end of the electromagnet shaft. Springs for needle bar reset are provided on the outer diameter of the needle bar at the needle bar positioning block. The groove on one side of the bottom of the active drive slider is wedged into the protruding common rail on one side of the bottom of the driven drive slider. The protruding drive seat on one side of the top of the active drive slider is connected to one end of the connecting rod. A guide rail trolley is provided on the inner side of the top of the driven drive slider. The guide rail inside the guide rail trolley is connected to the protruding side of the bottom of the shuttle seat of the headstock assembly. The protruding bottom of the shuttle seat wedges into the gap between the driven drive slider and the needle bar boxes on both sides of the top of the active drive slider. Thus, the connecting rod drives the driven drive slider sequentially through the active drive slider to achieve vertical linkage, while the active drive slider and the driven drive slider slide back and forth.

[0005] The needle bar boxes on both sides of the needle bar box assembly are C-shaped, with their opening sides facing each other. The outer corners of the needle bar boxes have upward-protruding square pillars. The bottom protrusion of the shuttle bed seat of the head box assembly weds into the gap between the opposing square pillars on the top outer side of the needle bar box. Symmetrically arranged guide rods on both sides are respectively positioned within the opening on one side of the C-shaped needle bar box. The driven drive slider on one side is I-shaped and connects to the two guide rods within the opening on the C-shaped side of the needle bar box on that side. The active drive slider is T-shaped and connects to the two guide rods within the opening on the C-shaped side of the needle bar box on that side. Simultaneously, an extension block, integrally formed at the top of the active drive slider, extends out of the needle bar box on that side and connects to the main connecting rod via a drive seat at the end of the extension block. The above describes a specific structural embodiment of the driven and active drive sliders within the needle bar boxes on both sides, facilitating the assembly of components such as the needle bar and guide rods.

[0006] The driving block has a right-angled trapezoidal protrusion on one side. One side of the driving edge slopes from top to bottom, and a chamfered end corner is formed along this slope and the connected short side. The small bearing at the end of the electromagnet shaft abuts against this end corner. Thus, the driving block, based on the guide groove, is further equipped with driving edges, facilitating the linkage between the electromagnet and the driving block.

[0007] A large bearing is provided on the upper edge of the middle of the inner side of the needle bar box of the needle bar box assembly below the bottom of the active drive slider. The shaft core of the large bearing is parallel to and perpendicular to the guide rods on both sides and is set in the shaft groove of the needle bar box. An auxiliary guide plate is provided on the inner side of the bottom of the needle bar box of the needle bar box assembly below the large bearing. The outer diameter of the side of the large bearing extending out of the needle bar box abuts against the auxiliary guide plate.

[0008] The needle bar box assembly below the large bearing has a positioning block at the bottom edge of the needle bar box. The hook of the positioning block is hooked and slides with the bottom edge of the auxiliary guide plate.

[0009] The shaft end and small bearing of the electromagnet are respectively inserted vertically from the outside of the needle bar box on both sides of the needle bar box assembly, and the electromagnets are fixedly installed in pairs on both sides of the needle bar box.

[0010] The needle bar box assembly has needle bar guide plates on the inner side of the needle bar box, and the small bearing is provided at the shaft end of the electromagnet through the waist-shaped hole or U-shaped opening of the needle bar guide plate.

[0011] The drive bearing at the first gear of the upper gear assembly on one side of the headstock assembly is fixed to the U-shaped opening on one side of the shuttle bed seat of the headstock assembly via a bearing seat. The first gear of the upper gear assembly meshes simultaneously with the second and third gears symmetrically arranged on the lower shuttle bed seat. The central shafts of the second and third gears are connected to the shaft of the cam mechanism on the other side of the shuttle bed seat. The bent crank arm in the middle of the cam mechanism is hinged to one end of the take-up rod of the take-up rod mechanism. The other end of the take-up rod is hinged and fixed to the shuttle bed seat above the cam mechanism. The other end of the lower connecting rod is hinged to the protrusion on one side of the cam of the cam mechanism. At the hinge point, the needle crank of the take-up rod mechanism is hinged to the other end of the guide rod and one end of the take-up rod. The other end of the take-up rod extends out of the shuttle bed seat of the headstock assembly.

[0012] The shuttle mechanism of the shuttle box assembly is respectively provided on the outer side of the shuttle bed symmetrically arranged on both sides. The inner side of the shuttle bed is provided with a lower gear assembly. The shuttle shell of the shuttle mechanism is connected to the upper gear of the lower gear assembly through the shuttle bed. The upper gear is engaged with the lower gear of the lower auxiliary bearing plate through the middle gear of the lower gear assembly. Thus, the upper gears of the shuttle mechanism are linked to the lower gears through the middle gears, and they are independent and do not interfere with each other.

[0013] The transmission shaft at the center of the lower gear assembly meshes with a bevel gear and a bevel gear ring inside the auxiliary bearing plate via a bevel gear. The center hole of the bevel gear ring is fixedly located in the left through hole on one side of the auxiliary bearing plate via a transmission bearing. A right through hole is provided on the other side of the auxiliary bearing plate, symmetrical to the left through hole. The left and right through holes on one side of the auxiliary bearing plate of the shuttle box assembly are aligned. This structure facilitates the installation of the shuttle box assembly onto the shaft of the corresponding quilting machine through the left and right through holes of the auxiliary bearing plate, further realizing and satisfying the linkage effect.

[0014] This utility model has a reasonable structural design, is easy to assemble, maintain and adjust, and has a good linkage effect. In particular, modular assembly, maintenance and adjustment are convenient, and the power transmission between the opening and closing direction of the clutch device and the linkage components is stable. It is suitable for use as a composite double needle head module of quilting and embroidery machine, as well as for structural improvements of similar products. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention. The dotted line in the diagram represents the needle bar box assembly and the upper auxiliary bearing plate structure of the shuttle box assembly, and part A is defined by the outline.

[0016] Figure 2 yes Figure 1 A schematic diagram of the rear three-dimensional structure.

[0017] Figure 3 yes Figure 1 A magnified schematic diagram of the active drive slider on one side of the needle bar box assembly is shown in the figure. The structure of the driven drive slider side of the needle bar box assembly is omitted in the figure.

[0018] Figure 4 yes Figure 1 Enlarged view of part A.

[0019] Figure 5 yes Figure 1 A schematic diagram showing the connection between the head assembly and the needle bar box assembly on one side.

[0020] Figure 6 yes Figure 1 A schematic diagram of the internal structure of the shuttle box assembly.

[0021] Figure 7 yes Figure 1 The diagram shows the connection between the head assembly and the needle bar box assembly. The needle bar boxes and needle bar guide plates on both sides are omitted in the diagram. The dotted line at the head assembly represents the upper gear assembly at the rear, and part B is framed.

[0022] Figure 8 yes Figure 7 Enlarged view of part B.

[0023] Figure 9 yes Figure 8A schematic diagram of the driven slider structure is shown, including guide rods on both sides.

[0024] Attached Figures and Their Names: 1. Headstock Assembly; 2. Needle Bar Box Assembly; 3. Hook Box Assembly; 301. Hook Mechanism; 302. Shuttle Bed; 303. Lower Gear Assembly; 304. Auxiliary Bearing Plate; 4. Shuttle Bed Seat; 5. Upper Gear Assembly; 6. Bearing Seat; 7. Thread Take-up Lever Mechanism; 701. Thread Take-up Connecting Rod; 702. Needle Bar Crank; 8. Thread Take-up Lever; 9. Cam Mechanism; 10. Connecting Rod; 11. Needle Bar; 12. Active drive slider, 1201, drive base, 1202, extension block, 13, guide rod, 14, electromagnet, 1401, small bearing, 15, drive block, 1501, drive side, 16, needle bar guide plate, 17, needle bar box, 18, guide rail trolley, 19, guide rail, 20, positioning block, 21, large bearing, 22, driven drive slider, 2201, common rail, 23, needle bar positioning block, 24, auxiliary common rail plate. Implementation

[0025] The structure and use of this utility model will now be further described with reference to the accompanying drawings. Figures 1-9As shown, the module includes a head box assembly 1, a needle bar box assembly 2, and a shuttle box assembly 3. The cam mechanism 9 of the head box assembly drives the needle bars 11, which are symmetrically arranged on both sides of the needle bar box assembly, to move up and down reciprocally through the connecting rod 10. Two needle bars on one side of the needle bar box assembly are arranged as a group and are respectively arranged in needle bar boxes 17 symmetrically arranged on both sides. The shuttle mechanism 301 of the shuttle box assembly corresponds to the needle bar below the needle bar. The needle bar box assembly has guide rods 13 on both sides of the needle bar box, and each guide rod has a drive block 15 that is reset by a torsion spring. Two guide rods on one side are symmetrically arranged on both sides of the active drive slider 12 in one side of the needle bar box, and two guide rods on the other side are symmetrically arranged on both sides of the driven drive slider 22 in the other side of the needle bar box. The two guide rods pass through the drive blocks that are simultaneously arranged on both sides of the active drive slider and the driven drive slider. The top end of the two guide rods is connected to the top end of the active drive slider and the driven drive slider, respectively, and the bottom end of the two guide rods is connected to the two needle bar boxes. The wedge head of the needle bar positioning block 23 is inserted into the drive block. Meanwhile, the guide groove on the side, the protruding drive edge 1501 on one side of the drive block abuts against the small bearing 1401 at the end of the electromagnet 14 shaft, and the needle bar outer diameter at the needle bar positioning block is provided with springs for needle bar reset. The groove on the bottom side of the active drive slider is wedged into the protruding public rail 2201 on the bottom side of the driven drive slider. The protruding drive seat 1201 on the top side of the active drive slider is connected to one end of the large connecting rod. The inner side of the top of the driven drive slider is provided with a guide rail trolley 18. The guide rail 19 in the guide rail trolley is connected to the protruding side of the bottom of the shuttle bed seat 4 of the headstock assembly. The protruding bottom of the shuttle bed seat is wedged into the gap between the needle bar boxes on the top sides of the driven drive slider and the active drive slider.

[0026] The needle bar boxes on both sides of the aforementioned needle bar box assembly are respectively "C" shaped and arranged opposite each other with their opening sides. The outer corners of the needle bar boxes are respectively upward-protruding square pillars. The bottom protrusion of the shuttle seat of the head box assembly is wedged into the gap between the opposite square pillars on the top outer side of the needle bar box. The guide rods arranged symmetrically on both sides are respectively set in the opening on one side of the C-shaped needle bar box. The driven drive slider on one side is "I" shaped and connected to the two guide rods in the opening on the C-shaped needle bar box on that side. The active drive slider is "Tu" shaped and connected to the two guide rods in the opening on the C-shaped needle bar box on that side. At the same time, the extension block 1202, which is integrated with the top of the active drive slider, extends out of the needle bar box on that side and is connected to the main connecting rod through the drive seat at the end of the extension block. The driving side protrudes on one side of the driving block in the form of right-angled trapezoidal protrusions. The inclined side of the driving side slopes from top to bottom, and there are connected and chamfered end corner edges along the inclined side and the connected short side. The small bearing at the end of the electromagnet shaft abuts against the end corner edge.

[0027] A large bearing 21 is provided on the upper edge of the inner side of the needle bar box of the needle bar box assembly below the bottom of the aforementioned active drive slider. The shaft of the large bearing is parallel and perpendicular to the guide rods on both sides and is set in the shaft groove of the needle bar box. An auxiliary guide plate 24 is provided on the inner side of the bottom of the needle bar box assembly below the large bearing on the driven slider below the large bearing. The outer diameter of the side of the large bearing extending out of the needle bar box abuts against the auxiliary guide plate. A positioning block 20 is provided on the lower edge of the bottom of the needle bar box assembly below the large bearing. The hook of the positioning block hooks and slides with the bottom edge of the auxiliary guide plate. The shaft end of the electromagnet and the small bearing are respectively inserted vertically from the outside of the needle bar boxes on both sides of the needle bar box assembly. The electromagnets are fixedly set in the needle bar boxes on both sides. A needle bar guide plate 16 is provided on the inner side of the needle bar box of the needle bar box assembly. The small bearing is provided through the U-shaped opening of the needle bar guide plate at the shaft end of the electromagnet. The drive bearing at the first gear of the upper gear assembly 5 on one side of the headstock assembly is fixed to the U-shaped opening on one side of the shuttle bed seat of the headstock assembly via the bearing seat 6. The first gear of the upper gear assembly meshes simultaneously with the second and third gears symmetrically arranged on the lower shuttle bed seat. The central shafts of the second and third gears are connected to the shaft of the cam mechanism on the other side of the shuttle bed seat. The bent crank arm in the middle of the take-up rod 8 of the cam mechanism is hinged to one end of the take-up rod connecting rod 701 of the take-up rod mechanism 7. The other end of the take-up rod connecting rod is hinged and fixed to the shuttle bed seat above the cam mechanism. The other end of the lower connecting rod is hinged to the protrusion on one side of the cam of the cam mechanism. At the hinge point, the needle crank 702 of the take-up rod mechanism is hinged to the other end of the guide rod and one end of the take-up rod. The other end of the take-up rod extends out of the shuttle bed seat of the headstock assembly.

[0028] The shuttle mechanism 301 of the aforementioned shuttle box assembly is respectively provided on the outer side of the shuttle beds 302 symmetrically arranged on both sides. Lower gear assemblies 303 are respectively provided on the inner side of the shuttle beds. The shuttle shells of the shuttle mechanism are connected to the upper gears of the lower gear assemblies through the shuttle beds. The upper gears mesh with the lower gears of the lower auxiliary bearing plate 304 through the middle gears of the lower gear assemblies. The transmission shaft at the center of the lower gear of the lower gear assembly meshes with the conical gear ring inside the auxiliary bearing plate through bevel gears. The central holes of the conical gear rings are respectively fixed to the left through holes on one side of the auxiliary bearing plate through transmission bearings. A right through hole is provided on the other side of the auxiliary bearing plate, symmetrical to the left through hole. The left and right through holes on one side of the auxiliary bearing plate of the shuttle box assembly are aligned.

[0029] In use, the head box assembly, needle bar box assembly, and shuttle box assembly of this module are modularly and sequentially installed into the body of the quilting machine to form a large multi-needle double-row needle structure.

Claims

1. A composite double-needle head module for a quilting and embroidery machine, the module comprising a head box assembly (1), a needle bar box assembly (2), and a shuttle box assembly (3), wherein the cam mechanism (9) of the head box assembly drives the needle bars (11) symmetrically arranged on both sides of the needle bar box assembly to reciprocate up and down via a connecting rod (10), and two needle bars on one side of the needle bar box assembly are respectively arranged in needle bar boxes (17) symmetrically arranged on both sides, with the shuttle mechanism (301) of the shuttle box assembly corresponding to the needle bars below; characterized in that The needle bar assembly (2) has guide rods (13) corresponding to the needle bars (11) on both sides of the needle bar boxes (17). Each guide rod has a drive block (15) that is reset by a torsion spring. Two guide rods on one side are symmetrically arranged on both sides of the active drive slider (12) in one side of the needle bar box, and two guide rods on the other side are symmetrically arranged on both sides of the driven drive slider (22) in the other side of the needle bar box. The two guide rods pass through the drive blocks that are simultaneously arranged on both sides of the active drive slider and the driven drive slider. The top end of the two guide rods is connected to the top end of the active drive slider and the driven drive slider, respectively, and the bottom end of the two guide rods is connected to the two needle bar boxes. The wedge head of the needle bar positioning block (23) of the needle bar is inserted into the drive block. Meanwhile, the guide groove on the side, the protruding drive edge (1501) on one side of the drive block abuts against the small bearing (1401) at the end of the electromagnet (14) shaft, and the needle bar outer diameter at the needle bar positioning block is provided with a spring for needle bar reset. The groove on the bottom side of the active drive slider is wedged into the protruding public rail (2201) on the bottom side of the driven drive slider. The protruding drive seat (1201) on the top side of the active drive slider is connected to one end of the large connecting rod (10). The inner side of the top of the driven drive slider is provided with a guide rail trolley (18). The guide rail (19) in the guide rail trolley is connected to the protruding side of the bottom of the shuttle bed seat (4) of the head box assembly. The protruding bottom of the shuttle bed seat is wedged into the gap between the needle bar boxes on the top sides of the driven drive slider and the active drive slider.

2. The composite double-needle head module for quilting and embroidery machines according to claim 1, characterized in that... The needle bar boxes (17) on both sides of the needle bar box assembly (2) are respectively "C" shaped and are set opposite to each other on the open side. The outer corners of the needle bar boxes are respectively raised square pillars. The bottom of the shuttle seat (4) of the head box assembly (1) is protruded and wedged into the gap between the opposite square pillars on the top of the needle bar box. The guide rods (13) symmetrically arranged on both sides are respectively set in the opening on the C-shaped side of the needle bar box. The driven slider (22) on one side is "I" shaped and connected to the two guide rods in the opening on the C-shaped side of the needle bar box on that side. The active drive slider (12) is "Tu" shaped and connected to the two guide rods in the opening on the C-shaped side of the needle bar box on that side. At the same time, the extension block (1202) at the top of the active drive slider is integrated and extends out of the needle bar box on that side, and is connected to the main connecting rod (10) through the drive seat (1201) at the end of the extension block.

3. The composite double-needle head module for quilting and embroidery machines according to claim 1, characterized in that... The driving edge (1501) protruding on one side of the driving block (15) is a right trapezoidal protrusion. The inclined side of the driving edge is inclined from the top to the bottom, and a chamfered end corner edge is provided along the inclined side and the connected short side. The small bearing (1401) at the end of the electromagnet (14) shaft abuts against the end corner edge.

4. The composite double-needle head module for quilting and embroidery machines according to claim 1, characterized in that... A large bearing (21) is provided on the upper edge of the middle of the bottom inner side of the needle bar box (17) of the needle bar box assembly (2) below the bottom of the active drive slider (12). The shaft core of the large bearing is parallel to and perpendicular to the guide rods (13) on both sides and is set in the shaft groove of the needle bar box. An auxiliary guide plate (24) is provided on the inner side of the bottom of the needle bar box assembly of the driven drive slider (22) below the large bearing. The outer diameter of the side of the large bearing extending out of the needle bar box abuts against the auxiliary guide plate.

5. The composite double-needle head module for quilting and embroidery machines according to claim 4, characterized in that... The needle bar box assembly (2) below the large bearing (21) has a positioning block (20) on the bottom edge of the needle bar box (17). The hook of the positioning block is hooked and slides with the bottom edge of the auxiliary guide plate (24).

6. The composite double-needle head module for quilting and embroidery machines according to claim 1, characterized in that... The shaft end of the electromagnet (14) and the small bearing (1401) are vertically inserted from the outside of the needle bar box (17) on both sides of the needle bar box assembly (2), and the electromagnets are fixedly installed in pairs on both sides of the needle bar box.

7. The composite double-needle head module for quilting and embroidery machines according to claim 6, characterized in that... The needle bar box assembly (2) has a needle bar guide plate (16) on the inner side of the needle bar box (17), and the small bearing (1401) is provided through the waist-shaped hole or U-shaped opening of the needle bar guide plate at the shaft end of the electromagnet (14).

8. The composite double-needle head module for quilting and embroidery machines according to claim 1, characterized in that... The drive bearing of the first gear of the upper gear assembly (5) on one side of the headstock assembly (1) is fixed in the U-shaped opening on one side of the shuttle bed seat (4) of the headstock assembly through the bearing seat (6). The first gear of the upper gear assembly meshes with the second gear and the third gear symmetrically arranged on the lower shuttle bed seat at the same time. The central shafts of the second gear and the third gear are connected to the shaft of the cam mechanism (9) on the other side of the shuttle bed seat. The middle bent arm of the take-up rod (8) of the cam mechanism is hinged to one end of the take-up rod connecting rod (701) of the take-up rod mechanism (7). The other end of the take-up rod connecting rod is hinged and fixed to the shuttle bed seat above the cam mechanism. The other end of the lower connecting rod is hinged to the cam protrusion on one side of the cam mechanism. At the hinge point, the needle crank (702) of the take-up rod mechanism is hinged to the other end of the guide rod (13) and one end of the take-up rod. The other end of the take-up rod extends out of the shuttle bed seat of the headstock assembly.

9. The composite double-needle head module for quilting and embroidery machines according to claim 1, characterized in that... The shuttle mechanism (301) of the shuttle box assembly (3) is respectively provided on the outside of the shuttle bed (302) symmetrically arranged on both sides, and the inner side of the shuttle bed is respectively provided with the lower gear assembly (303). The shuttle shell of the shuttle mechanism is connected to the upper gear of the lower gear assembly through the shuttle bed, and the upper gear meshes with the lower gear of the lower auxiliary bearing plate (304) through the middle gear of the lower gear assembly.

10. The composite double-needle head module for quilting and embroidery machines according to claim 9, characterized in that... The transmission shaft at the center of the lower gear of the lower gear assembly (303) meshes with the conical gear ring inside the auxiliary bearing plate (304) through a bevel gear. The center hole of the conical gear ring is fixedly set in the left through hole on one side of the auxiliary bearing plate through the transmission bearing. The other side of the auxiliary bearing plate, which is symmetrical to the left through hole, is provided with a right through hole. The left and right through holes on one side of the auxiliary bearing plate of the shuttle box assembly (3) are respectively aligned.

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