Assembly device and method for main shaft and hub of hoist

Abstract

The present invention discloses an assembly device and method for a main shaft and a wheel hub of a hoist. The assembly device comprises a fixed base, a double-groove box, two heating racks and a sliding seat. The double-groove box is fixed on one side of the upper end of the fixed base, and the sliding seat is slidably installed on the other side of the upper end of the fixed base. The two heating racks are respectively inserted on both sides of the double-groove box; a heating groove and a cooling groove are respectively arranged inside the double-groove box; when the main shaft and the left and right wheel hubs are assembled, the heating rack pushes the left and right wheel hubs into the heating groove for heating, and the sliding seat drives the main shaft to move between the left and right wheel hubs, and the mobile heating rack sleeves the left and right wheel hubs on both ends of the main shaft respectively, and the sliding seat drives the main shaft and the left and right wheel hubs to move into the cooling groove for cooling, thereby completing the interference connection between the main shaft and the left and right wheel hubs. The present invention also discloses an assembly method for the main shaft and the wheel hub. The assembly device and assembly method of the present invention can simultaneously complete the rapid interference fit of the main shaft and the wheel hub, thereby reducing the assembly cycle, cost and material consumption.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical assembly, and in particular relates to an assembly device and method for a main shaft and a hub of a hoist. Background Art

[0002] Mine hoists are important transportation equipment in mine work. They are generally installed on the ground or underground and use the lifting container along the shaft or ramp with the help of wire ropes. They are mainly used for lifting coal, ore, gangue in vertical and inclined shafts, as well as lifting personnel, lowering materials, tools and equipment, etc.

[0003] Patent document CN104128763A discloses a lathe spindle processing technology, including sequential roughing, semi-finishing and finishing, roughing includes sequential blank preparation, forging, normalizing, length cutting, rough turning of outer circle and end face, center hole drilling; semi-finishing includes sequential heat treatment and semi-finishing turning; finishing includes sequential local high-frequency quenching, finishing turning, outer surface grinding; the blank material is 40Gr. The provided lathe spindle processing procedure has high spindle processing efficiency, which is convenient for achieving the spindle to maintain its dimensional stability for a long time, which is beneficial to the processing accuracy of the lathe.

[0004] In the main shaft device of the hoist, the main shaft and the wheel hub bear all external loads and transmit them to other load-bearing components. Therefore, the assembly of the main shaft and the wheel hub directly affects the performance and cost of the hoist. In the traditional structure, the main shaft and the wheel hub are assembled by integral forging. This method can be integrally formed and can ensure the reliability of the connection, but this assembly method has a large assembly margin, a long assembly cycle, and a high assembly difficulty, and it is difficult to ensure the coaxiality of the inner holes of the left and right wheel hubs; others use a split forging method. This assembly method has at least the following two problems during the docking process: First, it cannot be applied to wheel hub structures of different sizes, which reduces its scope of application; second, when the main shaft and the wheel hub are assembled separately, they need to be docked by thermal interference fit, but this method cannot continuously complete the heating and cooling operations, which reduces the work efficiency of the main shaft and the wheel hub during thermal interference fit installation. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides an assembly device for a hoist main shaft and a wheel hub, which can solve the problems existing in the prior art such as large overall assembly margin, long assembly cycle, great assembly difficulty, and difficulty in ensuring the coaxiality of the inner holes of the left and right wheel hubs; it can also solve the problem that when a split assembly is used, different sizes of wheel hub structures cannot be used during the docking process, and when the main shaft and the wheel hub need to be docked by a thermal interference fit, the heating and cooling operations cannot be completed continuously.

[0006] In order to achieve the above purpose, the technical solution adopted by the present invention is: to provide an assembly device for the main shaft and the wheel hub of a hoist, comprising a fixed base, a double-groove box, two heating racks and a sliding seat, wherein the double-groove box is fixed to one side of the upper end of the fixed base, the sliding seat can be slidably and lifted and installed on the other side of the upper end of the fixed base, the two heating racks are respectively inserted on both sides of the double-groove box and can move horizontally; a heating groove and a cooling groove are respectively arranged inside the double-groove box; a groove for placing the main shaft is opened at the upper end of the sliding seat; the inner ends of the two heating racks are respectively provided with a groove for placing the left A placement frame for the wheel hub or the right wheel hub; when the main shaft and the left and right wheel hubs are assembled, the heating frame pushes the left wheel hub or the right wheel hub into the heating groove for heating; the sliding seat is moved to drive the main shaft to move between the left and right wheel hubs; the main shaft height is adjusted by the sliding seat to make the central axis of the main shaft and the central axis of the inner holes of the left and right wheel hubs on the same straight line; the heating frames on both sides are moved to respectively sleeve the left and right wheel hubs on both ends of the main shaft; the sliding seat drives the main shaft and the left and right wheel hubs to move to the cooling groove of the double-groove box for cooling, completing the interference connection between the main shaft and the left and right wheel hubs.

[0007] Furthermore, in an assembly device for a hoist main shaft and a wheel hub as described above, a side push plate is provided at the outer end of the heating frame, and the outer side push plate and the inner placement frame are connected by a push-pull plate; the placement frame is a square body structure with a hollow structure, and two sliding grooves are respectively opened on the corresponding two side surfaces, and a movable clamping rod is respectively inserted between the two sliding grooves on the same side, and the distance between the two movable clamping rods is adjusted to place left wheel hubs or right wheel hubs of different specifications.

[0008] Furthermore, in the assembly device for the main shaft and the hub of a hoist as described above, a heater is provided below the heating frame, and a plurality of flame spray ports are provided at the upper end of the heater.

[0009] Furthermore, in an assembly device for a hoist main shaft and a wheel hub as described above, a sliding block is installed at the bottom of the sliding seat, a lifting push rod is provided between the sliding seat and the sliding block, and an electric caster is installed at the bottom of the sliding block; the movement of the electric caster drives the sliding seat to move horizontally, and the lifting of the lifting push rod drives the sliding seat to rise or fall.

[0010] Furthermore, in the assembly device for the main shaft and the wheel hub of a hoist as described above, limit clamping wheels for fixing the main shaft are respectively provided on both sides of the upper end of the sliding seat, and two lower clamping wheels for placing the main shaft are provided on the inner side of the bottom of the sliding seat.

[0011] Furthermore, in the assembly device of the main shaft and the wheel hub of a hoist as described above, strip grooves for the operation of the left wheel hub and the right wheel hub are respectively opened on the upper end of the fixed base and the two sides of the sliding seat.

[0012] The beneficial technical effects of the present invention are:

[0013] (1) The assembly device of the present invention can continuously complete the heating and cooling operations of the left wheel hub and the right wheel hub by arranging a double-groove box on a fixed base and arranging a heating groove and a cooling groove in the double-groove box, so as to quickly connect the left wheel hub, the right wheel hub and the main shaft, thereby improving the assembly efficiency.

[0014] (2) The assembly device of the present invention can place wheels of different specifications by arranging heating racks on both sides of the double-slot box body and arranging a placement frame with an adjustable size at the inner end of the heating rack, thereby increasing the application range of the wheel hub.

[0015] (3) The assembly device of the present invention can move the main shaft and adjust the height of the main shaft by setting a sliding seat on the fixed base, so as to complete the quick and accurate assembly of the left and right wheel hubs and the main shaft, reducing the assembly cycle and assembly difficulty, and can ensure the coaxiality of the inner holes of the left and right wheel hubs, thereby improving the stability and safety of the hoist.

[0016] The present invention also provides a method for assembling a main shaft and a hub of a hoist, comprising the following steps:

[0017] Step 1: Place the left wheel hub and the right wheel hub on the heating racks on both sides of the double-groove box respectively; move the heating rack to push the left wheel hub and the right wheel hub into the heating groove of the double-groove box, heat the left wheel hub and the right wheel hub, so that the inner holes of the left wheel hub and the right wheel hub expand;

[0018] Step 2: Place the spindle on the sliding seat, move the sliding seat, and move the spindle between the left wheel hub and the right wheel hub; adjust the spindle height so that the center axis of the spindle and the center axis of the inner holes of the left wheel hub and the right wheel hub are in the same straight line; move the heating frame so that the inner holes of the left wheel hub and the right wheel hub are respectively sleeved on both ends of the spindle;

[0019] Step three, move the sliding seat, move the main shaft and the left and right wheel hubs into the cooling groove of the double-groove box, cool the left and right wheel hubs, reduce the inner holes of the left and right wheel hubs, and form interference connections between the left and right wheel hubs and the two ends of the main shaft.

[0020] Furthermore, in the assembly method as described above, in step 1, the left wheel hub and the right wheel hub are heated by spraying flames through heaters disposed under their respective heating racks, and a plurality of spray ports are disposed at the upper end of the heaters.

[0021] Further, as described in the above-mentioned assembly method, in step two, a sliding block is installed at the bottom of the sliding seat, a lifting top rod is provided between the sliding seat and the sliding block, and an electric caster is installed at the bottom of the sliding block; the movement of the electric caster drives the sliding seat to move horizontally, and the lifting top rod drives the sliding seat to rise or fall.

[0022] Furthermore, in the assembly method as described above, in step three, the cooling trough is cooled by cooling devices installed on both sides of the double-trough box.

[0023] The assembly method of the present invention can simultaneously complete the quick interference fit of the main shaft and the wheel hub, thereby reducing the assembly cycle, cost and material consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an overall structural diagram of the main shaft and hub assembly device of the hoist of the present invention;

[0025] Figure 2 It is the overall structural diagram of the double-slot box of the present invention;

[0026] Figure 3 It is the overall structural diagram of the heating rack and the heater of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the mobile clamping rod of the present invention;

[0028] Figure 5 It is the overall structural diagram of the sliding seat of the present invention;

[0029] Figure 6 It is a flow chart of the assembly method of the present invention.

[0030] In the figure: 1. Fixed base; 2. Strip groove; 3. Sliding seat; 4. Lifting plate; 5. Electric push rod; 6. Heating groove; 7. Double groove box; 8. Feed box; 9. Heating rack; 10. Inlet pipe; 11. Heater; 12. Injection port; 13. Docking groove; 14. Limit rod; 15. Push-pull plate; 16. Moving card rod; 17. Placement frame; 18. Limit card wheel; 19. Sliding block; 20. Lifting top rod; 21. Lower card wheel; 22. Horizontal push rod; 23. Cooling fan; 24. Exhaust groove; 25. Limit slider; 26. Electric caster; 27. Connecting pipe; 28. Fastening bolt; 29. ​​Slide; 30. Spindle; 31. Side push plate DETAILED DESCRIPTION

[0031] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0032] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence, and it should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0033] This application enjoys the priority of China's prior application, application number 202310852423.5, and invention name: "A method for processing the main shaft hub of a hoist".

[0034] like Figure 1 As shown, an assembly device for a main shaft and a hub of a hoist provided by the present invention comprises a fixed base 1, a double-slot box 7, two heating racks 9, two heaters 11, two cooling fans 23 and a sliding seat 3. The double-groove box 7 is fixed on one side of the upper end of the fixed base 1, and is used for heating and cooling the left wheel hub and the right wheel hub; the sliding seat 3 is installed on the other side of the upper end of the fixed base 1, and is used for placing the main shaft 30 and driving the main shaft 30 to slide to the bottom of the double-groove box 7; two heating racks 9 are respectively movably inserted on both sides of the double-groove box 7, and are used for placing the left wheel hub and the right wheel hub and pushing the left wheel hub and the right wheel hub into the heating groove of the double-groove box 7 for heating; two heaters 11 are respectively arranged under the two heating racks 9, and are used for heating the left wheel hub and the right wheel hub on the heating racks 9; two cooling fans 23 are respectively arranged on both sides of the double-groove box 7, and are used for cooling the left wheel hub and the right wheel hub in the cooling groove of the double-groove box 7; the upper end of the fixed base and both sides of the sliding seat 3 are respectively provided with strip grooves 2 for the operation of the left wheel hub and the right wheel hub.

[0035] like Figure 2 As shown, a heating tank 6 and a cooling tank are respectively arranged inside the double tank box 7, and the heating tank 6 and the cooling tank can be separated by two sets of lifting plates 4, and the lifting plates 4 are lifted and lowered by electric push rods 5 arranged at the top thereof. An exhaust groove 24 is opened on the upper end surface of the cooling tank to discharge the hot air generated in the cooling tank. An operation port for the sliding seat 3 to slide in is opened at the bottom of the double tank box 7.

[0036] like Figure 3 As shown, each heating frame includes a side push plate 31 arranged at the outer end and a placement frame 17 arranged at the inner end, and the outer side push plate 31 and the inner end placement frame 17 are connected by a push-pull plate 15. In order to ensure the stability of the heating frame 9, limit rods 14 are respectively arranged on both sides of the push-pull plate 15. The placement frame 17 adopts a square body structure with a hollow structure (convenient for the left and right hubs to fully contact the flame), and two symmetrically arranged slide grooves 29 are respectively opened on the corresponding two side surfaces, and a horizontally movable moving card rod 16 is respectively inserted between the two slide grooves 29 on the same side. By adjusting the distance between the two moving card rods 16, the left hub or right hub of different specifications can be placed, thereby meeting the assembly requirements of hubs of different specifications and increasing the applicable scope of the hub. In addition, the two moving card rods 16 can also prevent the left hub and the right hub from falling, and play a fixing role in the installation of the left hub and the right hub. The inner side of the placement frame 17 is provided with a docking groove 13, which is convenient for the main shaft to dock with the left and right hubs.

[0037] like Figure 4As shown, the two ends of the moving card rod 16 are respectively installed with a limit slider 25 and a fastening bolt 28. When in use, the moving card rod 16 and the placement frame 17 are loosened by rotating the fastening bolt 28, and the distance between the two groups of moving card rods 16 is adjusted by sliding the limit slider 25. When the distance meets the requirements, the fastening bolt 28 is rotated again to lock and fix the adjusted moving card rod 16.

[0038] In order to facilitate the placement of the left and right hubs, the present invention further installs feed boxes 8 on both side walls of the double-groove box 7, and the upper end of the feed box 8 is an open structure. The heating rack 9 is inserted into the heating groove 6 of the double-groove box 7 through the feed box 8. During heating, the left and right hubs are respectively placed in the corresponding feed boxes 8, and fall into the placement frame 17 of the heating rack from the feed boxes 8, thereby ensuring that the left and right hubs are placed in a vertical state in the radial direction, which is convenient for the docking of the left and right hubs with the spindle.

[0039] Each heater 11 has a plurality of flame nozzles 12 at its upper end for heating the left and right hubs on the frame so that the inner holes of the left and right hubs expand. The lower end of the heater 11 is connected to the connecting pipe 27 and the air inlet pipe 10 for delivering combustible gas to the heater 11. Figure 3 shown.

[0040] like Figure 5 As shown, a groove is formed at the upper end of the sliding seat 3 for placing the main shaft 30, a sliding block 19 is installed at the bottom, a lifting push rod 20 is provided between the sliding seat 3 and the sliding block 19, and an electric caster 26 is installed at the bottom of the sliding block 19. The horizontal movement of the electric caster 26 drives the sliding seat 3 to move horizontally, and the lifting and lowering of the lifting push rod 20 drives the sliding seat 3 to rise or fall, thereby ensuring the assembly accuracy and speed of the left and right wheel hubs and the main shaft, and reducing the assembly cycle and assembly difficulty.

[0041] In order to ensure the stability of the main shaft 30 in the sliding seat, the present invention provides two limit clamping wheels 18 for fixing the main shaft on both sides of the upper end of the sliding seat 3, and two lower clamping wheels 21 for fixing the main shaft are provided on the inner side of the bottom of the sliding seat 3. The limit clamping wheel 18 is fixed to the sliding seat 3 through a retractable transverse push rod 22. When in use, the transverse push rod 22 drives the limit clamping wheel 18 to translate, so that the limit clamping wheel 18 is clamped on both sides of the main shaft 30.

[0042] The working process of the assembly device of the present invention is as follows:

[0043] When the spindle is assembled with the left and right wheel hubs, first put the left and right wheel hubs into the placement frame 17 through their respective feed boxes 8; push the side push plate 31 to move the left and right wheel hubs in the placement frame 17 to the top of the heater 11, and heat them with the spray flame of the heater 11, so that the left and right wheel hubs expand due to the heat, and the inner holes become larger; clamp the spindle 30 in the groove at the upper end of the sliding seat 3, and use two sets of horizontal push rods 22 to drive the limit card wheel 18 to translate, and clamp the limit card wheel on both sides of the upper part of the spindle; drive the sliding seat 3 to move through the electric caster 26, so that the sliding seat 3 drives the spindle to move to the heating groove 6 of the double-groove box 7; according to the position of the inner holes of the left and right wheel hubs, adjust the height of the spindle 30 through the lifting push rod 20, so that the center axis of the spindle is aligned with the center of the inner holes of the left and right wheel hubs. The axis of the spindle is on the same straight line; the heating frame 9 is moved so that the left wheel hub and the right wheel hub are sleeved on both ends of the main shaft; the sliding seat 3 is driven twice by the lifting push rod 20 so that the sliding seat 3 drives the main shaft to rise and the left wheel hub and the right wheel hub at both ends of the main shaft are moved out of the placement frame 17; the sliding seat 3 is driven outward by the electric caster 26 to move into the cooling groove; the two groups of electric push rods 5 drive the lifting plate 4 to move downward to seal the two ends of the cooling groove; the cooling fan 23 is started to cool the left wheel hub and the right wheel hub by air cooling, and the hot air is discharged through the exhaust groove 24; when the left wheel hub and the right wheel hub are cooled in the cooling groove, their inner holes are reduced, and according to the principle of thermal expansion and contraction, the main shaft and the left wheel hub and the right wheel hub are all interference docked; after the docking is completed, the two groups of strip grooves 2 are cooperated to move the docked left wheel hub and the right wheel hub out.

[0044] like Figure 6 As shown, the assembly method of the hoist main shaft and the wheel hub provided by the present invention comprises the following steps:

[0045] Step 1: Process the main shaft and turn both ends of the main shaft; forge the left wheel hub and the right wheel hub, and process the inner holes at the centers of the left wheel hub and the right wheel hub.

[0046] Step 2: Place the forged left and right wheel hubs in the placement frame 17 at the inner end of the heating rack 9 through their respective corresponding feed boxes 8, move the side push plate 31 on the heating rack 9, push the left and right wheel hubs into the heating groove of the double groove box 7, and use the heater 11 under the heating rack 9 to spray heat the left and right wheel hubs to expand the inner holes of the left and right wheel hubs.

[0047] It should be noted that the heating temperature of the left and right hubs is generally 320-350 degrees Celsius, and the heating time is generally 3-4 hours. However, the heating time and heating temperature of the present invention are not limited by the above heating time and heating temperature. The heating time and heating temperature of the left and right hubs of the present invention are specifically determined according to their interference.

[0048] Step three, fix the machined spindle 30 in the groove at the upper end of the sliding seat 3, and fix it by two sets of lateral push rods 22; move the sliding seat 3 (through the electric caster 26), move the spindle to between the left wheel hub and the right wheel hub, so that the center axis of the spindle and the center axis of the inner hole of the left wheel hub and the right wheel hub are on the same straight line; adjust the spindle height (through the lifting push rod 20) according to the position of the inner hole of the left wheel hub and the right wheel hub; move the heating frame 9 (through the side push plate 31) so that the inner holes of the left wheel hub and the right wheel hub are respectively sleeved on the two ends of the spindle.

[0049] Step 4, move the sliding seat 3 upward (through the lifting push rod 20), so that the sliding seat 3 drives the main shaft and the left and right wheel hubs to move upward, and the main shaft and the left and right wheel hubs at both ends are moved out of the placement frame 17; the sliding seat 3 moves horizontally outward (through the electric casters 26), so that the main shaft and the left and right wheel hubs on the sliding seat 3 are moved into the cooling groove of the double-groove box 7; the lifting plate 4 moves downward (through two sets of electric push rods 5) to seal the two ends of the cooling groove; start the cooling fan 23, and cool the left and right wheel hubs by air cooling (down to room temperature). According to the principle of thermal expansion and contraction, the inner holes of the left and right wheel hubs are reduced, and the left and right wheel hubs and the two ends of the main shaft are interference connected.

[0050] Step 4: After the assembly is completed, cooperate with the two groups of strip grooves 2 on the fixed base 1 to move the cooled left and right wheel hubs out.

[0051] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An assembly device for a main shaft and a hub of a hoist, comprising a fixed base (1), a double-grooved box (7), two heating racks (9), two cooling fans (23) and a sliding seat (3), wherein: The double-slot box (7) is fixed to one side of the upper end of the fixed base (1); the sliding seat (3) is mounted on the other side of the upper end of the fixed base (1) in a manner that allows sliding and lifting; two heating racks (9) are respectively inserted on both sides of the double-slot box (7) and are capable of horizontal movement; a heating slot (6) and a cooling slot are respectively arranged inside the double-slot box (7); the heating slot (6) and the cooling slot can be separated by two sets of lifting plates (4); the lifting plates (4) are lifted and lowered by an electric push rod (5) arranged at the top thereof; a heating slot (6) and a cooling slot are respectively arranged inside the double-slot box (7); An exhaust groove (24) is used to discharge hot air generated in the cooling groove; two heat dissipation fans (23) are respectively arranged on both sides of the double-groove box (7) and are used to cool the left wheel hub and the right wheel hub in the cooling groove of the double-groove box (7); a groove for placing the main shaft is opened at the upper end of the sliding seat (3); a placement frame (17) for placing the left wheel hub or the right wheel hub is respectively provided at the inner ends of the two heating racks (9); when the main shaft and the left and right wheel hubs are assembled, the heating rack (9) pushes the left wheel hub or the right wheel hub into the heating groove (6) for heating; Move the sliding seat (3) so that it drives the main shaft to move between the left wheel hub and the right wheel hub; adjust the height of the main shaft so that the central axis of the main shaft and the central axis of the inner holes of the left wheel hub and the right wheel hub are on the same straight line; move the heating racks (9) on both sides to respectively sleeve the left wheel hub and the right wheel hub on both ends of the main shaft; the sliding seat (3) drives the main shaft and the left and right wheel hubs to move into the cooling groove of the double groove box (7) for cooling, thereby completing the interference connection between the main shaft and the left and right wheel hubs; the outer end of the heating rack (9) is provided with a side push plate (31), and the outer end side push plate (31 ) and the inner end placement frame (17) are connected by a push-pull plate (15); the placement frame (17) is a square body structure with a hollow structure, and two corresponding side surfaces thereof are respectively provided with two slide grooves (29), and a movable clamping rod (16) is respectively inserted between the two slide grooves (29) on the same side, and the distance between the two movable clamping rods (16) is adjusted to place left or right wheel hubs of different specifications; a heater (11) is provided below the heating frame (9), and a plurality of spray ports (12) are provided at the upper end of the heater (11).

2. The assembly device for the main shaft and the hub of a hoist according to claim 1, characterized in that: A sliding block (19) is installed at the bottom of the sliding seat (3), a lifting rod (20) is provided between the sliding seat (3) and the sliding block (19), and an electric caster (26) is installed at the bottom of the sliding block (19); the movement of the electric caster (26) drives the sliding seat (3) to move horizontally, and the lifting rod (20) is lifted and lowered to drive the sliding seat (3) to rise or fall.

3. The assembly device for the main shaft and the hub of a hoist according to claim 2, characterized in that: Limiting clamping wheels (18) for fixing the main shaft are respectively provided on both sides of the upper end of the sliding seat (3), and two lower clamping wheels (21) for fixing the main shaft are provided on the inner side of the bottom of the sliding seat (3).

4. The assembly device for the main shaft and the hub of a hoist according to claim 3, characterized in that: The upper end of the fixed base (1) and both sides of the sliding base (3) are respectively provided with strip-shaped grooves (2) for the left wheel hub and the right wheel hub to run.

5. A method for assembling a main shaft and a hub using the assembly device according to any one of claims 1 to 4, comprising the following steps: Step 1: placing the left wheel hub and the right wheel hub on the heating racks (9) on both sides of the double-groove box (7) respectively; moving the heating racks (9) to push the left wheel hub and the right wheel hub into the heating groove of the double-groove box (7), heating the left wheel hub and the right wheel hub, so that the inner holes of the left wheel hub and the right wheel hub expand; Step 2: placing the spindle (30) on the sliding seat (3), moving the sliding seat (3), and moving the spindle to between the left wheel hub and the right wheel hub; adjusting the height of the spindle so that the center axis of the spindle and the center axis of the inner holes of the left wheel hub and the right wheel hub are on the same straight line; moving the heating frame (9) so that the inner holes of the left wheel hub and the right wheel hub are respectively sleeved on both ends of the spindle; Step three, move the sliding seat (3), move the main shaft and the left and right wheel hubs into the cooling groove of the double groove box (7), cool the left and right wheel hubs, reduce the inner holes of the left and right wheel hubs, and achieve interference connection between the left and right wheel hubs and the two ends of the main shaft.

6. The assembly method according to claim 5, characterized in that: In step one, the left wheel hub and the right wheel hub are respectively heated by spraying flames through heaters (11) arranged below their respective heating racks (9), and a plurality of spray ports (12) are arranged at the upper end of the heaters (11).

7. The assembly method according to claim 6, characterized in that: in step 2, a sliding block (19) is installed at the bottom of the sliding seat (3), a lifting push rod (20) is provided between the sliding seat (3) and the sliding block (19), and an electric caster (26) is installed at the bottom of the sliding block (19); the movement of the electric caster (26) drives the sliding seat (3) to move horizontally, and the lifting push rod (20) is lifted and lowered to drive the sliding seat (3) to rise or fall.

8. The assembly method according to claim 7, characterized in that: In step three, the cooling tank is cooled by cooling devices installed on both sides of the double tank box (7).

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