A baling press shaft positioning tool

Abstract

The application provides a winding machine shaft positioning tool, which comprises a tool base plate and a disassembly clamping groove and an assembly clamping groove arranged on the tool base plate; the disassembly clamping groove comprises a first bearing positioning part, a first plug positioning part and a first transition part, a disassembly positioning hole is arranged in the middle of the first bearing positioning part, and the side wall of the first bearing positioning part forms a wheel seat matching surface extending along a first circumference; the assembly clamping groove comprises a second bearing positioning part, a second plug positioning part and a second transition part, an installation positioning hole is arranged in the middle of the second bearing positioning part, and the side wall of the second bearing positioning part forms a bearing matching surface extending along a second circumference. In the application, the disassembly clamping groove is matched with the arc side surface of the bearing wheel seat through the wheel seat matching surface, the bearing is positioned at the same time, and the shape of the bearing wheel seat is protected; the assembly clamping groove is matched with the circumferential side surface of the bearing through the bearing matching surface, the bearing is positioned, the through hole in the middle of the assembly clamping groove is aligned with the installation hole of the bearing wheel seat, and the installation of the pin shaft is facilitated.

Description

Technical Field

[0001] This invention relates to the field of tobacco equipment technology, and more specifically to a positioning fixture for a cigarette rolling machine. Background Technology

[0002] A cigarette rolling machine is an automated device that packages cigarettes into boxes. Its structure is usually relatively complex, requiring multiple modules to work together precisely to achieve efficient and high-quality packaging of cigarettes. Therefore, some key components in the equipment need to be regularly stopped for inspection and maintenance to ensure that a series of production processes are not hindered due to wear and tear of the components.

[0003] For example, in the GDX1 soft-pack packaging machine and GDX2 hard-pack packaging machine designed and manufactured by the Italian company GD, the No. 1 roller is one of the key components for conveying cigarettes during production. Even when there are no malfunctions in the production process, the No. 1 roller requires regular maintenance, including disassembling each component and inspecting its wear condition to determine if replacement is necessary. The shift shaft is a component of the No. 1 roller, and its structure includes an arc-shaped shift block and a shift rod connected to the shift block. One end of the shift block has a notch, which forms two bearing seats on both sides of the notch. Bearings are installed in the notch and are positioned by a pin that passes through the two bearing seats. When maintaining the No. 1 wheel, the pin and bearing need to be disassembled and inspected, and then reassembled. In actual operation, the disassembly and assembly process is time-consuming. On the one hand, the pin diameter is small and difficult to position. On the other hand, it is necessary to apply axial force to the pin by hammering to push the pin out of the mating structure or to jam the pin into the mating structure. During the hammering process, the wheel shaft will be subjected to intermittent high-intensity impact force. This impact force can easily cause deformation of the curved surface structure of the wheel shaft, especially the thinner bearing wheel seat part, which is more easily affected, resulting in a reduced life of the wheel shaft or even damage and disposal. In order to avoid damaging the wheel shaft, the disassembly and assembly process of the pin must be more careful, which further reduces the disassembly efficiency. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a positioning fixture for a winding and packaging machine's dial pin. This fixture not only positions the dial pin but also provides protection, preventing deformation caused by impact forces during pin assembly and disassembly. This improves the service life of the dial pin and increases the efficiency of its assembly and disassembly.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A winding and packaging machine shaft positioning fixture includes a fixture base plate. The mating side of the fixture base plate has a base plate plane, and the mating side is provided with a disassembly groove recessed to a first depth relative to the base plate plane and an assembly groove recessed to a second depth relative to the base plate plane. The disassembly groove includes a first bearing positioning part, a first insertion positioning part, and a first transition part connecting the first bearing positioning part and the first insertion positioning part. The first bearing positioning part has a disassembly positioning hole extending perpendicularly to the base plate plane and penetrating the fixture base plate in its middle portion. The sidewall of the first bearing positioning part forms an arc-shaped wheel seat extending along a first circumference. On the mating surface, the first insertion positioning part has a first insertion hole in the middle that penetrates the tooling substrate; the assembly slot includes a second bearing positioning part, a second insertion positioning part and a second transition part connecting the second bearing positioning part and the second insertion positioning part, the second bearing positioning part has an installation positioning hole in the middle that extends perpendicularly to the substrate plane and penetrates the tooling substrate, the sidewall of the second bearing positioning part forms a bearing mating surface that extends along the second circumference, the second insertion positioning part has a second insertion hole in the middle that penetrates the tooling substrate; the second depth is greater than the first depth, and the radius of the second circumference is greater than the first circumference.

[0007] This invention utilizes disassembly slots and assembly slots on a tooling base plate to perform disassembly and installation operations on the pin bearing, respectively. During disassembly, a portion of the lower side of the pin is embedded into the disassembly slot, with the embedding depth roughly equivalent to the thickness of the lower bearing seat. The seat mating surface of the first bearing positioning part corresponds to the arc-shaped side surface of the lower bearing seat, ensuring a close fit between the arc-shaped side surface and the mating surface. Under impact, the mating surface restricts the shape of the arc-shaped side surface, preventing deformation. Simultaneously, the bearing seat is not bent due to impact force thanks to the support of the slot bottom. During installation, the bearing is first movably placed in the slot at the end of the pin. Then, the pin with the bearing is embedded into the assembly slot, allowing the bearing to fall into the second bearing positioning part. The second bearing positioning part has a bearing mating surface that mates with the circumferential side surface of the bearing. This mating surface fixes the bearing in the second positioning part, aligning the through hole in the center of the bearing with the mounting hole on the bearing seat, facilitating the positioning and installation of the pin.

[0008] Furthermore, the pin disassembly hole is provided with an internal thread structure.

[0009] Furthermore, the first transition portion has an arc-shaped extension structure, and the two sidewalls of the first transition portion respectively form a first inner arc surface and a first outer arc surface. The two ends of the wheel seat mating surface are tangentially connected to the first inner arc surface and the first outer arc surface, respectively.

[0010] Furthermore, the second transition portion has an arc-shaped extension structure, and the two sidewalls of the second transition portion respectively form a second inner arc surface and a second outer arc surface. The two ends of the wheel seat mating surface are connected to the first inner arc surface and the first outer arc surface respectively. The junction of the wheel seat mating surface with the second inner arc surface and the second outer arc surface respectively forms an inner arc limiting portion and an outer arc limiting portion. The minimum distance between the inner arc limiting portion and the outer arc limiting portion is less than the diameter of the second circumference.

[0011] Furthermore, the distance between the first inner arc surface and the first outer arc surface gradually decreases in the direction close to the first bearing positioning part; the distance between the second inner arc surface and the second outer arc surface gradually decreases in the direction close to the second bearing positioning part.

[0012] Furthermore, two disassembly slots are symmetrically arranged on the tooling substrate, and a first blind hole is provided at the junction of the first insertion hole of at least one disassembly slot and the bottom surface of the slot.

[0013] Furthermore, two assembly slots are symmetrically arranged on the tooling base plate, and a second blind hole is provided at the junction of the second insertion hole of at least one assembly slot and the bottom surface of the slot.

[0014] Furthermore, the sidewall of the first insertion positioning part forms an arc-shaped first mating end face, and the two ends of the first mating end face are tangentially connected to the first inner arc surface and the first outer arc surface, respectively; the sidewall of the second insertion positioning part forms an arc-shaped second mating end face, and the two ends of the second mating end face are tangentially connected to the second inner arc surface and the second outer arc surface, respectively.

[0015] Furthermore, two locking blocks are arranged parallel to each other on the back side of the tooling substrate opposite to the substrate plane, and a substrate locking slot is formed between the two locking blocks.

[0016] The following beneficial effects can be achieved by applying this invention:

[0017] 1. The disassembly slot and assembly slot provided in this invention can be fixed in conjunction with the dial shaft, which solves the problem that the existing clamping mechanism is inconvenient to clamp the dial block with a curved side, and facilitates the positioning, disassembly or installation of the bearing of the dial shaft.

[0018] 2. The disassembly slot provided by this invention uses the wheel seat mating surface of the first bearing positioning part to mate with the arc-shaped side surface of the bearing wheel seat. The wheel seat mating surface can restrict the shape of the bearing wheel seat, and while positioning the bearing, it also protects the bearing wheel seat, preventing it from deforming and bending during hammering. The second bearing positioning part of the assembly slot is provided with a bearing mating surface that mates with the circumferential side surface of the bearing, positioning the bearing and aligning the through hole in its middle with the mounting hole of the bearing wheel seat. During the pin installation process, there is no need to manually adjust the position of the bearing, which facilitates the installation of the pin.

[0019] 3. The present invention can provide a first inner / outer arc surface and a second inner / outer arc surface to cooperate with the arc transition surface of the lever block, so as to further improve the protection of the overall structure of the lever block.

[0020] 4. This invention can set the pin disassembly hole as a threaded hole, and use a disassembly tool with external threads to cooperate with the pin disassembly hole, and push the pin out of the bearing structure from below, making the disassembly process more convenient, and the alignment accuracy between the disassembly tool and the pin is higher.

[0021] 5. In some embodiments of the present invention, a blind hole may be provided at the junction of the first / second insertion hole and the bottom surface of the groove to accommodate different types of dial shafts and improve versatility. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the positioning tool for the winding and packaging machine shaft in one embodiment;

[0023] Figure 2 for Figure 1 Top view of the disassembled card slot;

[0024] Figure 3 for Figure 1 Top view of the mounting slot;

[0025] Figure 4 This is a structural diagram of the short shaft of a wrapping machine;

[0026] Figure 5 This is a schematic diagram showing the fixed state of the tooling substrate;

[0027] Figure 6 This is a structural schematic diagram of the long shaft of a wrapping machine;

[0028] Figure 7 This is a schematic diagram of the structure of the positioning tool for the wrapping machine shaft in another embodiment;

[0029] Figure 8 for Figure 7 Top view of the tooling shown;

[0030] Figure 9 This is a top view of the mounting slot in another embodiment;

[0031] Figure 10 for Figure 9 The diagram shows the fitting structure between the mounting slot and the bearing.

[0032] In the figure, 1-tooling base plate, 11-base plate plane, 12-clamping block, 13-base plate bayonet, 2-disassembly slot, 2a-first disassembly slot, 2b-second disassembly slot, 21-first bearing positioning part, 211-wheel seat mating surface, 212-disassembly positioning hole, 22-first insertion positioning part, 221-first mating end face, 222-first insertion hole, 223-first blind hole, 23-first transition part, 231-first inner arc surface, 232-first outer arc surface, 3-assembly slot, 3a-first assembly slot, 3b-second assembly slot, 31-second bearing positioning part, 311-bearing mating surface. 312-Mounting positioning hole, 313-Upper groove, 314-Lower groove, 32-Second insertion positioning part, 321-Second mating end face, 322-Second insertion hole, 323-Second blind hole, 33-Second transition part, 331-Second inner arc surface, 332-Second outer arc surface, 34-Inner arc limiting part, 35-Outer arc limiting part, 4-Short lever shaft, 41-Lever block, 411-Bearing wheel seat, 412-Bearing, 413-Pin shaft, 414-Arc-shaped end face, 415-Arc-shaped transition surface, 42-Lever rod, 5-Fixing block, 51-Support base block, 52-Abutting block, 6-Long lever shaft, 61-End. Detailed Implementation

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

[0034] like Figures 1-3 As shown, an embodiment of the first aspect of the present invention provides a positioning fixture for a wrapping machine, which includes a fixture base plate 1 and a disassembly slot 2 and an assembly slot 3 disposed on the fixture base plate. The fixture base plate 1 has a base plate plane 11. The disassembly slot 2 is recessed with a relatively small first depth relative to the base plate plane, and the assembly slot 3 is recessed with a relatively large second depth relative to the base plate plane.

[0035] Reference Figure 2The disassembly slot 2 includes a first bearing positioning part 21 and a first insertion positioning part 22 located at both ends. The first bearing positioning part 21 and the first insertion positioning part 22 are connected by a first transition part 23 extending approximately in an arc direction on the substrate plane. The sidewall of the first bearing positioning part 21 forms a wheel seat mating surface 211 extending along the first circumference. The middle part of the first bearing positioning part forms a disassembly positioning hole 212 penetrating the tooling substrate in a direction perpendicular to the substrate plane. The sidewall of the first insertion positioning part 22 forms a curved first mating end face 221. The middle part of the first insertion positioning part forms a first insertion hole 222 penetrating the tooling substrate in a direction perpendicular to the substrate plane. The two opposite sidewalls of the first transition part form a first inner arc surface 231 and a first outer arc surface 232, respectively. The two ends of the wheel seat mating surface 211 are tangentially connected to the first inner arc surface and the first outer arc surface, respectively. The two ends of the first mating end face are tangentially connected to the first inner arc surface and the first outer arc surface, respectively.

[0036] Reference Figure 3 The mounting slot 3 includes a second bearing positioning part 31 and a second insertion positioning part 32 located at both ends. The second bearing positioning part 31 and the second insertion positioning part 32 are connected by a second transition part 33 extending approximately in an arc direction on the substrate plane. The sidewall of the second bearing positioning part 31 forms a bearing mating surface 311 extending along a second circumference, and the middle part of the second bearing positioning part forms a mounting positioning hole 312 penetrating the tooling substrate in a direction perpendicular to the substrate plane. The sidewall of the second insertion positioning part 32 forms a curved second mating end face 321, and the middle part of the second insertion positioning part forms a mounting positioning hole 312 penetrating the tooling substrate in a direction perpendicular to the substrate plane. A second insertion hole 322 is formed in the direction perpendicular to the plane of the substrate, penetrating the tooling substrate; the two opposite sidewalls of the second transition portion 33 are respectively formed with a second inner arc surface 331 and a second outer arc surface 332; the two ends of the bearing mating surface 311 are respectively connected to the second inner arc surface and the second outer arc surface, and an inner arc limiting portion 34 and an outer arc limiting portion 35 are respectively formed at the junction of the bearing mating surface with the second inner arc surface and the second outer arc surface; the minimum distance between the inner arc limiting surface and the outer arc limiting surface is less than the diameter of the second circumference; the two ends of the second mating end face 321 are respectively connected to the second inner arc surface and the second outer arc surface.

[0037] The following describes the specific application method of the shaft positioning fixture for the wrapping machine in the above embodiments, using the existing shaft structure of the wrapping machine as an example: Figure 4This illustration shows a rotary shaft for a packaging machine, specifically the short rotary shaft 4 of the first wheel for the GDX1 soft-pack packaging unit and the GDX2 hard-pack packaging unit designed and manufactured by the Italian company GD. It includes a rotary block 41 and a rotary lever 42 connected to the rotary block. The upper and lower planes of the rotary block have an arc-shaped extension structure. A notch is formed in the middle of the first end of the rotary block, dividing this end into upper and lower bearing seats 411. A bearing is arranged parallel to the upper and lower planes of the rotary block within the notch (i.e., between the upper and lower bearing seats). 412, the bearing 412 is positioned and installed by a pin 413 passing through two bearing seats 411. The radial edge of the bearing protrudes outward relative to the side of the lever. The side of the bearing seat forms a seat arc surface extending along a smaller circumference, and the radial edge of the bearing forms a circumferential side surface extending along a larger circumference. The second end side of the lever forms an arc end face 414. The lower side of the second end is perpendicularly connected to the lever 42. The middle side of the lever forms two arc transition surfaces 415 connecting the arc end face and the seat arc surface.

[0038] right Figure 4 When disassembling and positioning the bearing structure of the short shift shaft 4 shown, the shift rod 42 of the short shift shaft is inserted into the first insertion hole 222 of the disassembly slot 2, and the shift block 41 is fitted into the insertion slot. After fitting, the lower surface of the shift block is in contact with the bottom surface of the insertion slot, the wheel seat arc surface of the shift block is in contact with the wheel seat mating surface 211 of the first bearing positioning part 21, and the position of the pin corresponds to the disassembly positioning hole 212 of the first bearing positioning part. At this time, the bearing is located outside the disassembly slot, the bottom surface of the bearing corresponds to the base plate plane, and the two arc transition surfaces 415 of the shift block are respectively in contact with the first inner arc surface 231 and the first outer arc surface 231. The surface 232 mates with the arc-shaped end face 414 and the first mating end face 221, that is, the outline of the disassembly slot on the base plate plane corresponds to the shape of the upper and lower planes of the lever; after the disassembly slot and the short lever shaft are mated, pressure is applied to fix the short lever shaft, and the pin shaft 413 is pushed upward through the disassembly positioning hole 212. Then the bearing 412 is taken out, and the disassembly of the bearing structure is completed. Since the bearing is located on the outside of the disassembly slot; preferably, the disassembly positioning hole is provided with an internal thread structure, so that the disassembly tool with external thread can spiral up along the disassembly positioning hole and realize the disassembly of the pin shaft;

[0039] right Figure 4When the bearing structure of the short lever shaft shown is positioned and installed, the bearing is movably placed in the recess at the first end of the lever block, and then the lever is inserted into the second insertion hole 322 of the assembly slot 3, and the lever block is embedded in the assembly slot 3. After embedding, the bearing falls into the second bearing positioning part 31 of the assembly slot. The circumferential side of the bearing is engaged with the bearing mating surface 311. Due to the setting of the inner arc limiting part 34 and the outer arc limiting part 35, the bearing will be restricted and fixed in the second bearing positioning part. At this time, the position of the pin mounting hole corresponds to the reserved opening on the bearing seat for mounting the pin. The two arc transition surfaces 415 of the lever shaft are engaged with the second inner arc surface 331 and the second outer arc surface 332 respectively. The arc end face 414 is engaged with the second mating end face 321. That is, the outline of the disassembly slot on the base plate plane corresponds to the projection shape of the lever block containing the bearing on the upper and lower planes.

[0040] To achieve the above objectives, the diameter of the first circumference should be designed such that the mating surface 211 of the bearing seat can mate with the arc surface of the bearing seat, ensuring that the edge of the bearing seat is protected from deformation during the disassembly of the pin. The diameter of the second circumference should be designed such that the mating surface 311 of the bearing can mate with the circumferential side surface of the bearing 412, allowing the mating surface to secure the bearing in the assembly slot with the cooperation of the inner arc limiting part 34 and the outer arc limiting part 35. The first depth is preferably equivalent to the thickness of the bearing seat near the lower plane of the lever, ensuring that the lower bearing seat is fully embedded in the disassembly slot for better protection. Outside the disassembly slot, it is expected that in some other embodiments, even if the depth of the disassembly slot is greater than or less than the thickness of the bearing seat, the positioning of the lever can still be achieved, simply by aligning the contour of the disassembly slot with the lever. However, when the depth of the disassembly slot is less than the thickness of the bearing seat, the disassembly slot provides insufficient lateral protection for the lever, increasing the probability of lever deformation when external force is applied to push the pin out. When the depth of the disassembly slot is greater than the bearing seat, the lower plane of the lever is suspended above the slot bottom, and the support relationship between the lever and the tooling is formed between the bearing and the tooling base. Since pressure needs to be applied to fix the lever when pushing the pin out, the bearing will bear significant pressure, which may... This can lead to bearing deformation. Furthermore, the pressure on the bearing will be further applied to the bearing seat near the upper surface of the lever, easily causing deformation of the upper bearing seat. The second depth is preferably consistent with the overall thickness between the upper and lower surfaces of the lever, so that the bearing and both bearing seats are embedded in the mounting slot to provide optimal protection. It is anticipated that in some other embodiments, the depth of the mounting slot can be increased or decreased, as long as the bearing can be fixed in the slot. However, when the depth is increased, the upper surface of the lever is embedded too deeply, which is not conducive to fixing the lever. When the depth is decreased (for example, the depth is the sum of the thickness of the lower bearing seat and the bearing), the protection of the upper bearing seat is reduced. The disadvantage is that bearing installation is usually done from the easily observable upper side, which increases the probability of bearing seat deformation. In this embodiment, the first insertion positioning part 22 and the second insertion positioning part 32 are provided with a first mating end face 221 and a second mating end face 321 to mate with the arc-shaped end face of the lever. In other embodiments, the first mating end face and the second mating end face may not be provided. It is only necessary to leave space to place the lever into the slot. Since the disassembly and installation of the bearing occurs at the first end of the lever, the second end is basically not affected by deformation. Furthermore, the second end itself forms a positioning structure with the first / second disassembly hole through the lever, and the first mating end face 221 and the second mating end face 321 are not required for limiting.

[0041] Figure 5 A schematic diagram of a tooling substrate in a fixed state is shown in one embodiment. (Refer to...) Figure 1 The tooling substrate has two locking blocks 12 on its back side opposite to the substrate plane, and a substrate bayonet 13 is formed between the two locking blocks. The fixing device includes two movable fixing blocks 5, each of which includes a support base block 51 and an abutment block 52. In use, the locking block 12 is placed on the support base block 51 and the abutment block 52 is positioned in the substrate bayonet 13. Then, the two fixing blocks are controlled to move away from each other until the abutment block 52 of the fixing block abuts and is fixed to the inner side of the locking block 12.

[0042] In some models of wrapping machines, the dials are arranged in pairs. To further facilitate the disassembly of the dials, Figure 7 This invention illustrates a positioning fixture for a packing machine's rotary shafts. The fixture features two symmetrically arranged disassembly slots and two symmetrically arranged assembly slots, which improves work efficiency. However, in some cases, there is a difference between the paired rotary shafts. For example, in the first wheel of the GDX1 soft-pack packaging unit and the GDX2 hard-pack packaging unit, one of the paired rotary shafts is... Figure 4 The short dial shown is another one. Figure 6 The long shifter shown differs from the short shifter in that its lever is longer, and the lower side of the second end of the shifter block has an end head 61 with a diameter larger than the lever. The lever is connected to the end head. Due to the structural difference, the first / second insertion holes that mate with the short shifter cannot be used with the long shifter. The present invention further divides the two disassembly slots into a first disassembly slot 2a corresponding to the short shifter and a second disassembly slot 2b corresponding to the long shifter, and divides the two assembly slots into a first assembly slot 3a corresponding to the short shifter and a second assembly slot 3b corresponding to the long shifter. The second disassembly slot has a first blind hole 223 at the junction of the first insertion hole and the bottom surface of the slot to accommodate the end head 61. The second assembly slot has a second blind hole 323 at the junction of the second insertion hole and the bottom surface of the slot to accommodate the end head 61.

[0043] In some implementations, the fit between the mounting slot and the dial pin can be further improved. Figure 9 and Figure 10 A schematic diagram of an assembly slot and its mating structure is shown. In the diagram, the second bearing positioning portion of the assembly slot forms an upper groove 313 with a third depth and a lower groove 314 with a fourth depth. The sum of the third and fourth depths is equal to the second depth. The sidewall of the upper groove can mate with the circumferential side surface of the bearing, and the sidewall of the lower groove can mate with the arc surface of the bearing seat. That is, the sidewall of the upper groove has a mating structure with… Figure 3 The upper mating surface has the same shape as the mating surface of the middle bearing, and the lower groove sidewall has the same shape as the upper mating surface. Figure 2 The lower mating surface has the same shape as the mating surface of the middle wheel seat, thereby achieving a higher degree of fit and protection.

[0044] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A positioning fixture for a winding and packaging machine, characterized in that: The system includes a tooling substrate. The tooling substrate has a substrate plane on its mating side, and the mating side is provided with a disassembly slot recessed at a first depth relative to the substrate plane and an assembly slot recessed at a second depth relative to the substrate plane. The disassembly slot includes a first bearing positioning part, a first insertion positioning part, and a first transition part connecting the first bearing positioning part and the first insertion positioning part. The first bearing positioning part has a disassembly positioning hole extending perpendicularly to the substrate plane and penetrating the tooling substrate in its center. The sidewall of the first bearing positioning part forms an arc-shaped wheel seat mating surface extending along a first circumference. The first insertion positioning part has a first insertion hole penetrating the tooling substrate in its center. The assembly slot includes a second bearing positioning part, a second insertion positioning part, and a second transition part connecting the second bearing positioning part and the second insertion positioning part. The second bearing positioning part has an installation slot extending perpendicularly to the substrate plane and penetrating the tooling substrate in its center. The second bearing positioning part has a positioning hole, and the sidewall of the second bearing positioning part forms a bearing mating surface extending along the second circumference. The second insertion positioning part has a second insertion hole that penetrates the tooling substrate in the middle. The second depth is greater than the first depth, and the radius of the second circumference is greater than the radius of the first circumference. The first transition part extends in an arc shape, and the two sidewalls of the first transition part form a first inner arc surface and a first outer arc surface, respectively. The two ends of the wheel seat mating surface are tangentially connected to the first inner arc surface and the first outer arc surface, respectively. The second transition part extends in an arc shape, and the two sidewalls of the second transition part form a second inner arc surface and a second outer arc surface, respectively. The two ends of the wheel seat mating surface are connected to the first inner arc surface and the first outer arc surface, respectively. The bearing mating surface forms an inner arc limiting part and an outer arc limiting part at the junction with the second inner arc surface and the second outer arc surface, respectively. The minimum distance between the inner arc limiting part and the outer arc limiting part is less than the diameter of the second circumference.

2. The positioning fixture for a winding and packaging machine according to claim 1, characterized in that: The disassembly positioning hole is provided with an internal thread structure.

3. The positioning fixture for a wrapping machine according to claim 2, characterized in that: The distance between the first inner arc surface and the first outer arc surface gradually decreases in the direction close to the first bearing positioning part; the distance between the second inner arc surface and the second outer arc surface gradually decreases in the direction close to the second bearing positioning part.

4. The positioning fixture for a wrapping machine shaft according to claim 1, characterized in that: Two disassembly slots are symmetrically arranged on the tooling base plate, and a first blind hole is provided at the junction of the first insertion hole of at least one disassembly slot and the bottom surface of the slot.

5. The positioning fixture for a winding and packaging machine according to claim 1, characterized in that: Two assembly slots are symmetrically arranged on the tooling base plate, and a second blind hole is provided at the junction of the second insertion hole of at least one assembly slot and the bottom surface of the slot.

6. The positioning fixture for a winding and packaging machine according to claim 1, characterized in that: The sidewall of the first insertion positioning part forms an arc-shaped first mating end face, and the two ends of the first mating end face are tangentially connected to the first inner arc surface and the first outer arc surface, respectively; the sidewall of the second insertion positioning part forms an arc-shaped second mating end face, and the two ends of the second mating end face are tangentially connected to the second inner arc surface and the second outer arc surface, respectively.

7. The positioning fixture for a wrapping machine shaft according to claim 1, characterized in that: The second bearing positioning part includes an upper groove recessed at a third depth and a lower groove recessed at a fourth depth, the sum of the third depth and the fourth depth being equal to the second depth; the upper groove has an upper mating surface that matches the shape of the bearing mating surface, and the lower groove has a lower mating surface that matches the shape of the wheel seat mating surface.

8. The positioning fixture for a wrapping machine according to claim 1, characterized in that: Two locking blocks are arranged parallel to each other on the back side of the tooling substrate opposite to the substrate plane, and a substrate locking slot is formed between the two locking blocks.

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