CN111689358A

CN111689358A - Heavy-load step for subway station and machining process of auxiliary wheel shaft of heavy-load step

Info

Publication number: CN111689358A
Application number: CN202010191306.5A
Authority: CN
Inventors: 许应龙; 吉敏祥
Original assignee: Nantong Jiangzhong Photoelectricity Co ltd
Current assignee: Nantong Jiangzhong Photoelectricity Co ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2020-09-22
Anticipated expiration: 2040-03-18
Also published as: CN111689358B

Abstract

The invention discloses a processing technology of a heavy-load step and an auxiliary wheel shaft thereof for a subway station, belonging to the technical field of heavy-load steps for subway stations. The auxiliary wheel shaft combined by iron shaft core cladding aluminum can replace the traditional aluminum die-casting auxiliary wheel shaft, the strength is greatly improved, the oxidation resistance of the auxiliary wheel shaft is ensured, and the auxiliary wheel shaft can be effectively prevented from rusting.

Description

Heavy-load step for subway station and machining process of auxiliary wheel shaft of heavy-load step

Technical Field

The invention relates to the technical field of heavy-load steps for subway stations, in particular to a heavy-load step for a subway station and a machining process of an auxiliary wheel shaft of the heavy-load step.

Background

The escalator is composed of a chain conveyor with special structure and two belt conveyors with special structure, and has a circulating moving ladder way for transporting passengers upwards or downwards between different floor heights of a building. A continuous conveying machine for carrying people up and down. The step refers to a stair interface on the escalator, and is a part for passengers to stand.

The steps for the escalator in the current subway station are all common commercial steps, the auxiliary wheel shaft on the steps is usually aluminum die-cast and has low bearing capacity, but the passenger flow of the subway station is very large, so that hidden troubles exist when the common commercial steps are used. Therefore, a processing technology of the heavy-load step for the subway station and the auxiliary wheel shaft of the heavy-load step is provided.

Disclosure of Invention

1. Technical problem to be solved

Aiming at the problems in the prior art, the invention aims to provide a processing technology of a heavy-load step for a subway station and an auxiliary wheel shaft thereof, which can be realized.

2. Technical scheme

In order to solve the above problems, the present invention adopts the following technical solutions.

The utility model provides a processing technology of heavy load step and auxiliary wheel axle for subway station, includes step and auxiliary wheel axle processing technology, the step includes footboard, kickplate and support, footboard and kickplate fixed connection, the one end that the footboard was kept away from to the footboard and the one end that the footboard was kept away from to the kickplate all with support fixed connection, the one end of support has been seted up and has been inlayed the groove, the inside fixed mounting who inlays the groove has the auxiliary wheel axle, movable mounting has the auxiliary wheel on the outer wall that support one end was kept away from to the auxiliary wheel axle, the inside that auxiliary wheel axle one end was kept away from to the support is provided with the main shaft, movable mounting has the main wheel on the outer wall.

The auxiliary wheel shaft comprises a shaft core, a first outer cladding layer and a second outer cladding layer are arranged on the outer wall of the shaft core, clamping blocks are fixedly mounted on the outer wall, close to one side of the second outer cladding layer, of the upper end and the lower end of the first outer cladding layer, a plurality of connecting grooves are formed in the outer wall of the shaft core, a plurality of protruding blocks matched with the connecting grooves are arranged on the inner walls of the first outer cladding layer and the second outer cladding layer, and filling balls are arranged inside the protruding blocks.

The auxiliary wheel shaft processing technology comprises the following steps:

s1, taking a cylindrical solid iron bar, cutting the cylindrical solid iron bar into a proper length by a cutting machine to obtain a shaft core;

s2, performing surface treatment on the shaft core in the step S through a grinding device to make the outer wall of the shaft core rough;

s3, clamping the shaft core in the step S on a clamp, and continuously drilling holes on the surface of the shaft core through a drilling machine to form connecting grooves;

s4, integrally injection-molding a first outer wrapping layer containing a fixture block, a bump and a filling ball by adopting an injection molding process;

s5, integrally injection-molding a second outer cladding layer containing grooves, bumps and filling balls by adopting an injection-molding process;

and S6, coating the first outer cladding layer and the second outer cladding layer on the outer wall of the shaft core, adopting a stamping process to enable the bumps to enter the connecting grooves and the fixture blocks to enter the grooves, installing the first outer cladding layer and the second outer cladding layer on the surface of the shaft core, and combining into a complete outer cladding layer to obtain the auxiliary wheel shaft.

Furthermore, the auxiliary wheel shaft is embedded in the embedding groove, and the auxiliary wheel shaft is in interference fit with the embedding groove, so that the auxiliary wheel shaft is stably connected with the support.

Further, the material of axle core is iron, the material of first surrounding layer, second surrounding layer is aluminium, and iron ground is hard, bearing capacity is strong, nevertheless rusts easily, and aluminium oxidation resistance is strong, through first surrounding layer and the second surrounding layer of cladding aluminium matter on the outer wall of the axle core of iron, can make the auxiliary wheel axle have very strong bearing capacity promptly, and have very strong oxidation resistance.

Furthermore, the outer wall of one side, close to the first outer cladding layer, of the upper end and the lower end of the second outer cladding layer is provided with grooves, the clamping block is in interference fit with the grooves, the clamping block and the grooves are arranged, the first outer cladding layer and the second outer cladding layer can be conveniently connected, and then the shaft core can be conveniently coated with the outer cladding layers.

Furthermore, the filling ball is made of a rubber film wrapping the sodium hydroxide powder, the filling ball is broken when the outer covering layer is broken, the sodium hydroxide powder in the filling ball has strong water absorption, and the shaft core is prevented from rusting within a certain time.

Further, the polishing device in the step S comprises a device base, a positioning groove matched with the shaft core is arranged on the outer wall of the top of the device base, the left end and the right end of the outer wall of the top of the device base are both fixedly provided with supporting rods, a supporting plate is fixedly arranged between the supporting rods and above the device base, a motor is fixedly arranged on the outer wall of one side of the front surface of the supporting plate, a disc is fixedly connected on a driving shaft of the motor, the top end of the disc is fixedly connected with a connecting rod, the outer wall of the connecting rod, which is far away from the front side of the disc, is fixedly connected with a linkage block, a sliding rod is fixedly arranged between the supporting rods, a polishing block is movably arranged on the outer wall of the sliding rod, the top end of the grinding block is fixedly connected with a linkage rod, the middle of the linkage rod is provided with a linkage groove, and the bottom end of the grinding block is provided with a grinding groove matched with the shaft core.

Further, the length of constant head tank is the same with the length of axle core, the degree of depth of constant head tank is less than the radial half of axle core, and the location of placing of axle core can be convenient for in the setting of constant head tank, and makes most axle core tightly expose in the outside of constant head tank, and then the polishing of the axle core of being convenient for.

Further, the linkage block sets up cylindrically, and the linkage block runs through the linkage groove and rather than sliding connection, through the setting of motor, disc, connecting rod, linkage block, slide bar, sanding block, gangbar, linkage groove, the starter motor drives the disc and rotates, makes the connecting rod drive the linkage block and rotate, and the linkage block drives the gangbar through the linkage groove and makes a round trip to slide to drive sanding block and polish the axle core, make axle core surface coarse, and then make the axle core more firm with being connected between the outsourcing layer.

Further, the slide bar is located between backup pad and the device base, the left and right sides of sanding block all is equipped with the stopper of fixed mounting on the slide bar outer wall, and when linkage piece swung to the disc centre of a circle positive right side, sanding block removed stopper department to the right side, and when linkage piece swung to the disc centre of a circle positive left side, sanding block removed to left stopper department.

Further, the polishing groove is arranged to be semicircular, the radius of the polishing groove is the same as that of the shaft core, the shaft core can be conveniently polished through the polishing groove, one half of the shaft core can be polished through polishing, and the shaft core can be turned over once.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) this scheme is assisted the shaft embedding and is installed and inlay the inslot, and is assisted the shaft and inlay groove interference fit for it is firm to assist shaft and leg joint.

(2) The material of axle core is iron, and the material of first surrounding layer, second surrounding layer is aluminium, and iron ground is hard, bearing capacity is strong, nevertheless rusts easily, and aluminium oxidation resistance is strong, through first surrounding layer and the second surrounding layer of cladding aluminium matter on the outer wall of the axle core of iron, can make the auxiliary wheel axle have very strong bearing capacity promptly, and have very strong oxidation resistance.

(3) The arrangement of the clamping block and the groove can facilitate the connection of the first outer cladding layer and the second outer cladding layer, and further facilitate the cladding of the outer cladding layer on the shaft core.

(4) The filling ball is arranged, when the outer cladding is broken, the filling ball is broken, the sodium hydroxide powder in the filling ball has strong water absorption, and the shaft core is prevented from rusting within a certain time.

(5) The setting of constant head tank can be convenient for the location of placing of axle core, and makes most axle cores tightly expose in the outside of constant head tank, and then the polishing of the axle core of being convenient for.

(6) Through the setting of motor, disc, connecting rod, linkage piece, slide bar, sanding block, gangbar, linkage groove, the starter motor drives the disc and rotates, makes the connecting rod drive the linkage piece and rotates, and the linkage piece drives the gangbar through the linkage groove and makes a round trip to slide to drive sanding block and polish the axle core, make axle core surface coarse, and then make the connection between axle core and the outsourcing layer more firm.

(7) And due to the arrangement of the limiting blocks, when the linkage block swings to the right side of the circle center of the disc, the polishing block moves to the limiting block on the right side, and when the linkage block swings to the right left side of the circle center of the disc, the polishing block moves to the limiting block on the left side.

(8) Through the setting in groove of polishing, can be convenient for polish the axle core, once polish and can polish half of axle core, surface treatment can be accomplished to the axle core once of upset.

Drawings

FIG. 1 is a schematic view of the structure of the step of the present invention;

FIG. 2 is a top view of the interior of the stent of the present invention;

FIG. 3 is a cross-sectional top view of the auxiliary axle of the present invention;

FIG. 4 is a side view of a first overwrap of the present invention;

FIG. 5 is a schematic view of the polishing apparatus of the present invention;

FIG. 6 is a cross-sectional view of the base of the apparatus of the present invention;

figure 7 is a side view of the sanding block of the present invention.

The reference numbers in the figures illustrate:

1. a pedal; 2. a kickplate; 3. a support; 4. embedding a groove; 5. an auxiliary wheel shaft; 501. a shaft core; 502. a first outer cladding; 503. a second outer cladding layer; 504. a groove; 505. a clamping block; 506. connecting grooves; 507. a bump; 508. filling a ball; 6. an auxiliary wheel; 7. a main shaft; 8. a main wheel; 9. a device base; 10. positioning a groove; 11. a support bar; 12. a support plate; 13. a motor; 14. a disc; 15. a connecting rod; 16. a linkage block; 17. a slide bar; 18. grinding blocks; 19. a linkage rod; 20. a linkage groove; 21. a limiting block; 22. and (5) polishing the groove.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example 1:

referring to fig. 1-2, a heavy-duty step for a subway station and a processing technology of an auxiliary axle thereof include a step and an auxiliary axle processing technology, the step includes a pedal 1, a kick plate 2 and a support 3, the pedal 1 and the kick plate 2 are fixedly connected, one end of the pedal 1, which is far away from the kick plate 2, and one end of the kick plate 2, which is far away from the pedal 1, are both fixedly connected with the support 3, one end of the support 3 is provided with an embedding groove 4, an auxiliary axle 5 is fixedly installed inside the embedding groove 4, the auxiliary axle 5 is embedded and installed in the embedding groove 4, the auxiliary axle 5 is in interference fit with the embedding groove 4, so that the auxiliary axle 5 is stably connected with the support 3, an auxiliary wheel 6 is movably installed on an outer wall of one end of the auxiliary axle 5, a main axle 7 is arranged inside the support 3, which is far away from one end of the auxiliary axle 5.

Referring to fig. 3-4, the auxiliary wheel axle 5 includes an axle core 501, a first outer cladding 502 and a second outer cladding 503 are disposed on an outer wall of the axle core 501, the axle core 501 is made of iron, the first outer cladding 502 and the second outer cladding 503 are made of aluminum, the iron is hard and has strong bearing capacity, but is easy to rust, the aluminum has strong oxidation resistance, the first outer cladding 502 and the second outer cladding 503 are coated on the outer wall of the iron axle core 501, so that the auxiliary wheel axle 5 has strong bearing capacity and strong oxidation resistance, a fixture block 505 is fixedly mounted on the outer wall of one side of the first outer cladding 502 close to the second outer cladding 503, grooves 504 are formed on the outer walls of the upper and lower ends of the second outer cladding 503 close to one side of the first outer cladding 502, the fixture block 505 is in interference fit with the grooves 504, the fixture block 505 and the grooves 504 are disposed, so as to facilitate the connection of the first outer cladding 502 and the second outer cladding 503, and then be convenient for cladding the surrounding layer on axle core 501, a plurality of spread groove 506 have been seted up on axle core 501's the outer wall, all be provided with a plurality ofly on the inner wall of first surrounding layer 502 and second surrounding layer 503 with the lug 507 of spread groove 506 looks adaptation, the inside of lug 507 is provided with the packing ball 508, packing ball 508 is formed by the outer preparation of one deck rubber film of cladding of sodium hydroxide powder, the setting of packing ball 508, when the surrounding layer breaks, packing ball 508 is broken, inside sodium hydroxide powder has very strong hydroscopicity, prevent that axle core 501 from rustting in a certain time, and before the sodium hydroxide powder became invalid, it can to change auxiliary wheel axle 5.

The auxiliary wheel shaft processing technology comprises the following steps:

s1, taking a cylindrical solid iron bar, cutting the cylindrical solid iron bar into a proper length by a cutting machine to obtain an axial core 501;

s2, performing surface treatment on the shaft core 501 in the step S1 by a grinding device to roughen the outer wall of the shaft core 501;

s3, clamping the shaft core 501 in the step S2 on a clamp, and continuously drilling on the surface of the shaft core 501 by a drilling machine to form a connecting groove 506;

s4, integrally injection-molding the first outer wrapping layer 502 containing the fixture block 505, the bump 507 and the filling ball 508 by adopting an injection-molding process;

s5, integrally injection-molding a second outer cladding 503 containing grooves 504, bumps 507 and filling balls 508 by adopting an injection-molding process;

s6, the first outer cladding 502 and the second outer cladding 503 are clad on the outer wall of the shaft core 501, the protrusion 507 is made to enter the connecting groove 506 and the locking block 505 is made to enter the groove 504 by stamping, the first outer cladding 502 and the second outer cladding 503 are mounted on the surface of the shaft core 501 to form a complete outer cladding, and the secondary wheel shaft 5 is manufactured.

Referring to fig. 5-7, the polishing device in step S2 includes a device base 9, a positioning groove 10 matching with the shaft core 501 is formed on the outer wall of the top of the device base 9, the length of the positioning groove 10 is the same as the length of the shaft core 501, the depth of the positioning groove 10 is less than half of the radius of the shaft core 501, the positioning groove 10 is arranged to facilitate the placement and positioning of the shaft core 501, and most of the shaft core 501 is exposed outside the positioning groove 10, thereby facilitating the polishing of the shaft core 501, support rods 11 are fixedly mounted at the left and right ends of the outer wall of the top of the device base 9, a support plate 12 is fixedly mounted between the support rods 11 and above the device base 9, a motor 13 is fixedly mounted on the outer wall of one side of the front face of the support plate 12, a disc 14 is fixedly connected to a drive shaft of the motor 13, a connecting rod 15 is fixedly connected to the top end of the disc, a sliding rod 17 is fixedly arranged between the supporting rods 11, the sliding rod 17 is positioned between the supporting plate 12 and the device base 9, the left side and the right side of the polishing block 18 are respectively provided with a limiting block 21 fixedly arranged on the outer wall of the sliding rod 17, when the linkage block 16 swings to the right side of the circle center of the disc 14, the polishing block 18 moves to the limiting block 21 on the right side, when the linkage block 16 swings to the right side of the circle center of the disc 14, the polishing block 18 moves to the limiting block 21 on the left side, the outer wall of the sliding rod 17 is movably provided with the polishing block 18, the top end of the polishing block 18 is fixedly connected with a linkage rod 19, the middle part of the linkage rod 19 is provided with a linkage groove 20, the linkage block 16 is cylindrical, the linkage block 16 penetrates through the linkage groove 20 and is in sliding connection with the linkage groove, and the motor 13 is started to drive the disc 14 to rotate through the arrangement of the motor 13, the disc 14, the linkage, make connecting rod 15 drive linkage block 16 and rotate, linkage block 16 drives gangbar 19 through linkage groove 20 and makes a round trip to slide, thereby it polishes to axle core 501 to drive polishing block 18, make axle core 501 rough surface, and then make the connection between axle core 501 and the outsourcing layer more firm, polishing block 18's bottom offer with the groove 22 of polishing of axle core 501 looks adaptation, polishing groove 22 sets up to semi-circular, and the radius of polishing groove 22 is the same with axle core 501's radius, setting through polishing groove 22, can be convenient for polish axle core 501, once polish half of axle core 501, axle core 501 can be accomplished once in the upset, the concrete operation of surface operation does: the utility model discloses a polishing machine, including the constant head tank 10, the constant head tank 10 is placed to the axis core 501, starter motor 13, drive sanding block 18, and after a certain period, when sanding block 18 removed to left side stopper 21 department, stop motor 13, take out and put back constant head tank 10 after 180 degrees of the upset of axis core 501 in, starter motor 13 continues to polish, after a certain period, take out the axis core 501 and can accomplish surface treatment.

In the invention, the auxiliary wheel shaft 5 is embedded and installed in the embedding groove 4, and the auxiliary wheel shaft 5 is in interference fit with the embedding groove 4, so that the auxiliary wheel shaft 5 is stably connected with the bracket 3, the shaft core 501 is made of iron, the first outer cladding 502 and the second outer cladding 503 are made of aluminum, the iron is hard and has strong bearing capacity but is easy to rust, the aluminum has strong oxidation resistance, the auxiliary wheel shaft 5 has strong bearing capacity and strong oxidation resistance by coating the first outer cladding 502 and the second outer cladding 503 of aluminum on the outer wall of the iron shaft core 501, the arrangement of the fixture block 505 and the groove 504 is convenient for the connection of the first outer cladding 502 and the second outer cladding 503, the outer cladding is further convenient to coat the shaft core 501, the arrangement of the filling ball 508 is realized, when the outer cladding is broken, the filling ball 508 is broken, the sodium hydroxide powder in the inner part has strong water absorption, and the shaft core 501 is prevented from rusting within a certain time, the positioning groove 10 is arranged to facilitate the placement and positioning of the shaft core 501, and most of the shaft core 501 is tightly exposed outside the positioning groove 10, so as to facilitate the polishing of the shaft core 501, the motor 13, the disc 14, the connecting rod 15, the linkage block 16, the sliding rod 17, the polishing block 18, the linkage rod 19 and the linkage groove 20 are arranged, the motor 13 is started to drive the disc 14 to rotate, the connecting rod 15 drives the linkage block 16 to rotate, the linkage block 16 drives the linkage rod 19 to slide back and forth through the linkage groove 20, so as to drive the polishing block 18 to polish the shaft core 501, the surface of the shaft core 501 is rough, so that the connection between the shaft core 501 and the outer cladding is firmer, the positioning block 21 is arranged, when the linkage block 16 swings to the right side of the center of the disc 14, the polishing block 18 moves to the position of the limiting block 21 on the right side, when the linkage block 16 swings to the right side of the center of the disc 14, the polishing block 18, through the arrangement of the grinding groove 22, the shaft core 501 can be conveniently ground, half of the shaft core 501 can be ground by one-time grinding, and the surface treatment can be completed by turning over the shaft core 501 once; compared with the prior art, the auxiliary wheel shaft formed by combining the iron shaft core coated with the aluminum can replace the traditional aluminum die-cast auxiliary wheel shaft, the strength is greatly improved, the oxidation resistance of the auxiliary wheel shaft is ensured, and the auxiliary wheel shaft can be effectively prevented from rusting.

The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.

Claims

1. The utility model provides a processing technology of heavy load step and auxiliary wheel axle for subway station, includes step and auxiliary wheel axle processing technology, its characterized in that: the stair comprises a pedal (1), a kickplate (2) and a support (3), the pedal (1) is fixedly connected with the kickplate (2), one end, far away from the kickplate (2), of the pedal (1) and one end, far away from the pedal (1), of the kickplate (2) are fixedly connected with the support (3), one end of the support (3) is provided with an embedding groove (4), an auxiliary wheel shaft (5) is fixedly installed inside the embedding groove (4), an auxiliary wheel (6) is movably installed on the outer wall, far away from one end of the support (3), of the auxiliary wheel shaft (5) of the support (3), a main shaft (7) is arranged inside one end, far away from the auxiliary wheel shaft (5), of the support (3), and a main wheel (8) is movably installed on the outer wall of the main shaft (7;

the auxiliary wheel shaft (5) comprises a shaft core (501), a first outer cladding (502) and a second outer cladding (503) are arranged on the outer wall of the shaft core (501), clamping blocks (502) are fixedly mounted on the outer wall of one side, close to the second outer cladding (503), of the upper end and the lower end of the first outer cladding (502), a plurality of connecting grooves (506) are formed in the outer wall of the shaft core (501), a plurality of convex blocks (507) matched with the connecting grooves (506) are arranged on the inner walls of the first outer cladding (502) and the second outer cladding (503), and filling balls (508) are arranged inside the convex blocks (507);

the auxiliary wheel shaft processing technology comprises the following steps:

s1, taking a cylindrical solid iron bar, cutting the solid iron bar into a proper length by a cutting machine to obtain an axial core (501);

s2, performing surface treatment on the shaft core (501) in the step S1 through a grinding device to roughen the outer wall of the shaft core (501);

s3, clamping the shaft core (501) in the step S2 on a clamp, and continuously drilling holes on the surface of the shaft core (501) through a drilling machine to form a connecting groove (506);

s4, integrally injection-molding a first outer wrapping layer (502) containing a fixture block (505), a bump (507) and a filling ball (508) by adopting an injection-molding process;

s5, integrally injection-molding a second outer cladding (503) containing a groove (504), a bump (507) and a filling ball (508) by adopting an injection-molding process;

s6, the first outer cladding (502) and the second outer cladding (503) are clad on the outer wall of the shaft core (501), the bump (507) enters the connecting groove (506) and the fixture block (505) enters the groove (504) by adopting a stamping process, the first outer cladding (502) and the second outer cladding (503) are installed on the surface of the shaft core (501) to form a complete outer cladding, and the auxiliary wheel shaft (5) can be manufactured.

2. The processing technology of the heavy-load stair and the auxiliary wheel shaft thereof for the subway station as claimed in claim 1, wherein: the auxiliary wheel shaft (5) is embedded in the embedding groove (4), and the auxiliary wheel shaft (5) is in interference fit with the embedding groove (4).

3. The processing technology of the heavy-load stair and the auxiliary wheel shaft thereof for the subway station as claimed in claim 1, wherein: the shaft core (501) is made of iron, and the first outer cladding (502) and the second outer cladding (503) are made of aluminum.

4. The processing technology of the heavy-load stair and the auxiliary wheel shaft thereof for the subway station as claimed in claim 1, wherein: the outer wall of one side of the second outer cladding layer (503), which is close to the first outer cladding layer (502), is provided with a groove (504), and the fixture block (502) is in interference fit with the groove (504).

5. The processing technology of the heavy-load stair and the auxiliary wheel shaft thereof for the subway station as claimed in claim 1, wherein: the filling ball (508) is made of sodium hydroxide powder wrapped by a layer of rubber film.

6. The processing technology of the heavy-load stair and the auxiliary wheel shaft thereof for the subway station as claimed in claim 1, wherein: the polishing device in the step S2 comprises a device base (9), wherein a positioning groove (10) matched with a shaft core (501) is formed in the outer wall of the top of the device base (9), supporting rods (11) are fixedly mounted at the left end and the right end of the outer wall of the top of the device base (9), a supporting plate (12) is fixedly mounted between the supporting rods (11) and above the device base (9), a motor (13) is fixedly mounted on the outer wall of the front side of the supporting plate (12), a disc (14) is fixedly connected to a driving shaft of the motor (13), a connecting rod (15) is fixedly connected to the top end of the disc (14), a linkage block (16) is fixedly connected to the outer wall of the connecting rod (15) far away from the front side of the disc (14), a sliding rod (17) is fixedly mounted between the supporting rods (11), and a polishing block (18) is movably mounted on the outer, the top end of the polishing block (18) is fixedly connected with a linkage rod (19), a linkage groove (20) is formed in the middle of the linkage rod (19), and a polishing groove (22) matched with the shaft core (501) is formed in the bottom end of the polishing block (18).

7. The processing technology of the heavy-load stair and the auxiliary wheel shaft thereof for the subway station as claimed in claim 6, wherein: the length of the positioning groove (10) is the same as that of the shaft core (501), and the depth of the positioning groove (10) is smaller than half of the radius of the shaft core (501).

8. The processing technology of the heavy-load stair and the auxiliary wheel shaft thereof for the subway station as claimed in claim 6, wherein: the linkage block (16) is cylindrical, and the linkage block (16) penetrates through the linkage groove (20) and is in sliding connection with the linkage groove.

9. The processing technology of the heavy-duty stair for the subway station and the auxiliary wheel shaft thereof as claimed in claim 6, wherein: the sliding rod (17) is located between the supporting plate (12) and the device base (9), and limiting blocks (21) fixedly mounted on the outer wall of the sliding rod (17) are arranged on the left side and the right side of the polishing block (18).

10. The processing technology of the heavy-duty stair for the subway station and the auxiliary wheel shaft thereof as claimed in claim 6, wherein: the grinding groove (22) is semicircular, and the radius of the grinding groove (22) is the same as that of the shaft core (501).