CN114110089B - Chain for constant-step-distance convenient maintenance outdoor ladder - Google Patents

Chain for constant-step-distance convenient maintenance outdoor ladder Download PDF

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Publication number
CN114110089B
CN114110089B CN202111454281.4A CN202111454281A CN114110089B CN 114110089 B CN114110089 B CN 114110089B CN 202111454281 A CN202111454281 A CN 202111454281A CN 114110089 B CN114110089 B CN 114110089B
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CN
China
Prior art keywords
lubricating
chain
pin shaft
chain plate
shaped
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CN202111454281.4A
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Chinese (zh)
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CN114110089A (en
Inventor
夏占豪
黄伟达
黄雅丹
刘家强
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Universal Transmission Taizhou Co ltd
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Universal Transmission Taizhou Co ltd
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Priority to CN202111454281.4A priority Critical patent/CN114110089B/en
Publication of CN114110089A publication Critical patent/CN114110089A/en
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Publication of CN114110089B publication Critical patent/CN114110089B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G13/00—Chains
    • F16G13/02—Driving-chains
    • F16G13/06—Driving-chains with links connected by parallel driving-pins with or without rollers so called open links
    • F16G13/07—Driving-chains with links connected by parallel driving-pins with or without rollers so called open links the links being of identical shape, e.g. cranked
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B23/00—Component parts of escalators or moving walkways
    • B66B23/02—Driving gear
    • B66B23/024—Chains therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G15/00—Chain couplings, Shackles; Chain joints; Chain links; Chain bushes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G15/00—Chain couplings, Shackles; Chain joints; Chain links; Chain bushes
    • F16G15/12—Chain links
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G15/00—Chain couplings, Shackles; Chain joints; Chain links; Chain bushes
    • F16G15/12—Chain links
    • F16G15/14—Chain links made of sheet metal, e.g. profiled
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/042—Guidance of lubricant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/045—Lubricant storage reservoirs, e.g. reservoirs in addition to a gear sump for collecting lubricant in the upper part of a gear case
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/0463—Grease lubrication; Drop-feed lubrication
    • F16H57/0464—Grease lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • F16H57/05—Features relating to lubrication or cooling or heating of chains

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chain Conveyers (AREA)

Abstract

The invention relates to the technical field of chains, in particular to a chain for an outdoor ladder with equal step distances and convenient maintenance. The technical scheme adopted by the invention is as follows: the novel roller structure comprises a roller structure with a sealing cover, wherein a sleeve structure is connected with an inner central hole of the roller structure with the sealing cover, the sleeve structure is connected with an inner chain plate and an outer chain plate through a pin shaft structure, the pin shaft structure is composed of a lubrication D-shaped pin shaft and a check ring pin shaft, every two connecting pin shafts are adjacent to one lubrication D-shaped pin shaft, a check ring is arranged at the outer side of each check ring pin shaft, and the two adjacent lubrication D-shaped pin shafts and the corresponding check ring pin shafts are connected together through a shaft chain plate and an S-shaped outer chain plate. The invention has the advantages that: the integral safety and durability of the outdoor ladder in the use process are guaranteed, the integral safety of the outdoor ladder in the use process is higher, the integral lubricating performance in the use process is better, the period of maintenance is longer, and the integral use and maintenance cost is lower.

Description

Chain for constant-step-distance convenient maintenance outdoor ladder
Technical Field
The invention relates to the technical field of chains, in particular to a chain for an outdoor ladder with equal step distances and convenient maintenance.
Background
The step is apart from outdoor ladder through the connection when the chain moves about in the use, general chain need be through carrying out periodic independent lubrication when using, the whole security that advances in the use hardly obtains the guarantee, and maintenance operation is more troublesome in the use, especially when the maintenance to chain structure, need carry out comprehensive even maintenance, maintenance efficiency is lower, maintenance cost is also higher, the easy trouble in the use, make outdoor ladder's life also can be influenced, rainwater, dust etc. in the external environment easily enter into the hinge of chain when using, make whole lubricating property also can be influenced when using.
Disclosure of Invention
The invention aims to provide a chain for an outdoor ladder with equal step distance and convenient maintenance, which adopts a brand-new structural design, can realize automatic lubrication operation in the use process, ensures the overall safety and durability in the use process, ensures the overall safety of the outdoor ladder in the use process to be higher, has better overall lubrication performance in the use process, has longer period in maintenance, and has lower overall use and maintenance cost and longer service life. The technical scheme of the invention is as follows:
a chain that is used for equidistant convenient maintenance of step outer ladder, its characterized in that: including taking sealed lid gyro wheel structure, the inside centre bore of taking sealed lid gyro wheel structure is connected with sleeve structure, sleeve structure' S inside is in the same place with inner link joint and outer link joint through the round pin axle structure, the round pin axle structure comprises lubricated D type round pin axle and retaining ring round pin axle, every two connecting pin axle with one lubricated D type round pin axle is adjacent, the outside position of retaining ring round pin axle is equipped with the retaining ring, adjacent two lubricated D type round pin axle with link joint and S type outer link joint link together through axle link joint and S type between the retaining ring round pin axle, axle link joint, S type outer link joint and different hole outer link joint are constituteed the outer link joint, sleeve structure with take to be equipped with self-lubricating structure between the sealed lid gyro wheel structure.
Further, the self-lubricating structure comprises a press-fit type press-filling oil cup arranged at the center of one side end face of the lubrication D-shaped pin shaft and one side end face of the check ring pin shaft, lubrication liquid conveying holes in the press-fit type press-filling oil cup are communicated, lubrication oil storage grooves are formed in the outer cylindrical surfaces of the lubrication D-shaped pin shaft and the check ring pin shaft, the lubrication oil storage grooves are communicated with the lubrication liquid conveying holes through cylindrical lubrication transition fit holes, the inner chain plates with the end face positions of two sides of the roller structure are connected together through first sealing gaskets and second sealing gaskets, S-shaped air hole grooves with the same size are formed in the left side position of the lower end of the first sealing gasket and the left side position of the upper end of the second sealing gasket respectively, the S-shaped air hole grooves are communicated with the outer cylindrical surfaces of the first sealing gasket or the second sealing gasket, and the inner central holes are in circular arc-shaped lubrication oil transition fit safe and smooth grooves are formed in the fit positions of the inner cylindrical surfaces of the sleeve structure and the lubrication grooves.
Further, the self-lubricating structure between the sleeve structure and the roller structure with the sealing cover is a self-lubricating bearing.
Further, the press-fit type oil injection cup performs reset operation during press injection through the structure of a reset spring.
Further, the depth of the S-shaped air hole groove is half of the thickness of the first sealing gasket.
Further, the sleeve structure is provided with a safe and effective hardening layer, and the thickness of the safe and effective hardening layer is 0.4-0.7mm.
Further, the outer surfaces of the lubrication D-shaped pin shaft and the check ring pin shaft are provided with a hardening protection layer, and the thickness of the hardening protection layer is 0.6-0.9mm.
Further, the heat treatment hardness of the outer link plate is greater than the heat treatment hardness of the inner link plate.
The invention has the beneficial effects that:
1. the invention adopts a brand new structural design, can realize automatic lubrication operation in the use process, reduces manual operation during maintenance, is more convenient to maintain, and can ensure comprehensive lubrication without independently lubricating and filling each connecting position.
2. The integral safety and durability of the outdoor ladder in the use process are guaranteed, the integral safety of the outdoor ladder in the use process is guaranteed to be higher, and the application range of the chain in the use process is effectively improved.
3. The whole lubricating performance in the use process is better, the period is longer when maintenance is carried out, the whole use and maintenance cost is lower, the service life is longer, and the whole use safety is more ensured.
Drawings
FIG. 1 is a schematic front view of a portion of the structure of the present invention;
FIG. 2 is a schematic top view of a portion of the structure of the present invention;
FIG. 3 is a schematic cross-sectional view of the position A-A of the present invention;
FIG. 4 is a schematic cross-sectional view of the B-B position of the present invention;
FIG. 5 is a schematic cross-sectional view of the invention at position C-C;
FIG. 6 is a schematic diagram of a lubricated D-pin according to the present invention;
FIG. 7 is a schematic view of a retainer pin according to the present invention;
FIG. 8 is a schematic view of a first sealing gasket of the present invention;
FIG. 9 is a schematic view of a second sealing gasket of the present invention;
in the figure: 1. the novel lubricating oil storage tank comprises an inner chain plate, a sleeve structure, a roller structure with a sealing cover, an outer chain plate, a lubricating D-shaped pin shaft, a check ring, a shaft chain plate, an S-shaped outer chain plate, a check ring pin shaft, a check ring, a special-hole outer chain plate, a first sealing gasket, a press-fit type oil cup, a second sealing gasket, a safety smooth groove, a lubricating oil transition fit type oil storage groove and a lubricating oil storage groove, wherein the inner chain plate, the sleeve structure, the sealing cover and the roller structure are arranged in sequence, the sealing cover is arranged in sequence, the outer chain plate, the lubricating D-shaped pin shaft is arranged in sequence, the check ring pin shaft is arranged in sequence, the special-hole outer chain plate is arranged in sequence, the special-hole, the first sealing gasket is arranged in sequence, the press-fit type oil cup is arranged in sequence, the second sealing gasket, the lubricating oil is arranged in sequence, and the lubricating oil transition and.
Detailed Description
As shown in fig. 1 to 9, the chain for the constant-step-distance convenient maintenance outdoor ladder adopts a brand-new structural design, can realize automatic lubrication operation in the use process, ensures the overall safety and durability in the use process, ensures the overall safety of the outdoor ladder in the use process to be higher, has better overall lubrication performance in the use process, has longer period in maintenance, and has lower overall use and maintenance cost and longer service life. The novel chain comprises a roller structure 3 with a sealing cover, wherein a sleeve structure 2 is connected to the central hole of the roller structure 3 with the sealing cover, the sleeve structure 2 is connected with an inner chain plate 1 and an outer chain plate 4 through a pin shaft structure, the pin shaft structure is composed of a lubrication D-shaped pin shaft 5 and a check ring pin shaft 9, every two connecting pin shafts are adjacent to one lubrication D-shaped pin shaft 5, a check ring 6 is arranged at the outer side of the check ring pin shaft 9, two adjacent lubrication D-shaped pin shafts 5 and check ring pin shafts 9 are connected together through a shaft chain plate 7 and an S-shaped outer chain plate 8, and the shaft chain plate 7, the S-shaped outer chain plate 8 and an abnormal-hole outer chain plate 10 are composed of the outer chain plate 4, so that the strength and safety requirements of external connection of an integral chain are met. The sleeve structure 2 with be equipped with self-lubricating structure between the sealed lid gyro wheel structure 3 in area, guarantee chain structure's active position can carry out comprehensive even efficient lubrication operation in the use, can satisfy outdoor ladder convenient needs when maintaining and maintaining.
Preferably, the self-lubricating structure comprises a press-fit type oil-pressing cup 12 arranged at the center of one side end face of the lubrication D-shaped pin shaft 5 and one side end face of the check ring pin shaft 9, lubrication liquid conveying holes in the press-fit type oil-pressing cup 12 are communicated, lubrication oil storage grooves 51 are formed in the outer cylindrical surfaces of the lubrication D-shaped pin shaft 5 and the check ring pin shaft 9, the lubrication oil storage grooves 51 are communicated with the lubrication liquid conveying holes through cylindrical lubrication transition fit holes, the inner chain plate 1 and the outer chain plate 4 with the end face positions at two sides of the sealing cover roller structure 3 are connected together through a first sealing gasket 11 and a second sealing gasket 13, an S-shaped air hole groove with the same size is formed in the left side position of the lower end of the first sealing gasket 11 and the left side position of the upper end of the second sealing gasket 13, and the holes are formed in the outer chain plate side, and the air hole bending direction is matched with a chain to run clockwise. The S-shaped air hole groove is communicated with the outer cylindrical surface and the inner central hole of the first sealing gasket 11 or the second sealing gasket 13, the matching position of the inner cylindrical surface of the sleeve structure 2 and the lubricating oil storage groove 51 is provided with a circular arc-shaped lubricating oil transition matching safe smooth groove 14, automatic uniform conveying of lubricating oil inside the structure is guaranteed, the oil storage groove is arranged above a step chain, and when the hinge pair moves above an escalator rail, grease is continuously supplied to a stressed sliding friction point below through self gravity. When the hinge pair moves to the lower part of the escalator, the hinge pair is not stressed and does not generate sliding friction, and grease returns to the oil storage tank through self gravity. The sealing gasket is assembled between the inner joint chain plate and the outer joint chain plate, the sealing gasket is slightly deformed by the extrusion of the inner joint chain plate and the outer joint chain plate, and the sealing gasket and the inner joint chain plate and the outer joint chain plate slide and rub when the step chain hinge pair rotates, so that the sealing gasket has good lubricating property and wear resistance. The sleeve forms a hinge pair oil storage space with the outer link plate gap, the pin shaft oil filling hole, the pin shaft and sleeve side gap and the pin shaft and sleeve oil storage groove, after assembly, the lubricating grease is filled into the pin shaft through the pin shaft upper press-fit type oil filling cup, the sealing gasket is provided with air holes, the oil storage space is prevented from forming vacuum, the lubricating grease is conveniently filled, and the grease is seen to overflow at the air holes of the sealing gasket to stop filling oil. The direction of the air hole of the sealing gasket is opposite to the running direction of the step chain, the air hole of the sealing gasket is a bent channel, the air hole of the sealing gasket is filled with grease, and rainwater, dust and the like cannot enter the hinge friction pair in an outdoor environment, so that the lubricating friction performance of the hinge pair is reduced.
Preferably, the self-lubricating structure between the sleeve structure 2 and the roller structure 3 with the sealing cover is a self-lubricating bearing, so that the efficiency of the whole production is higher, but the whole cost is higher, and the whole cost during maintenance is also higher.
Preferably, the press-fit type oil injection cup 12 performs the reset operation during the injection through the structure of the reset spring, so that the structural safety during the automatic lubrication is better and the durability is stronger.
Preferably, the depth of the S-shaped air hole groove is half the thickness of the first sealing gasket 11, so that the structural strength of the position is higher, the service life is longer in use, and the safety is ensured.
Preferably, the sleeve structure 2 is provided with a safe and effective hardening layer, and the thickness of the safe and effective hardening layer is 0.4-0.7mm, so that the use stability of the structure is better.
Preferably, the outer surfaces of the lubrication D-shaped pin shaft 5 and the check ring pin shaft 9 are provided with a hardening protection layer, the thickness of the hardening protection layer is 0.6-0.9mm, the durability is stronger in use, the service life can be further prolonged, and the maintenance period is longer.
Preferably, the heat treatment hardness of the outer link plate 4 is greater than that of the inner link plate 1, so that the structural strength of the overall chain can be further improved, and the overall service life can be optimized.
While the foregoing is directed to the preferred embodiments of the present invention, it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions should also be considered to be within the scope of the present invention.

Claims (7)

1. A chain that is used for equidistant convenient maintenance of step outer ladder, its characterized in that: comprises a roller structure (3) with a sealing cover, wherein a sleeve structure (2) is connected to an inner center hole of the roller structure (3) with the sealing cover, the sleeve structure (2) is internally connected with an inner chain plate (1) and an outer chain plate (4) through a pin shaft structure, the pin shaft structure is composed of a lubricating D-shaped pin shaft (5) and a check ring pin shaft (9), every two check ring pin shafts (9) in the length direction of a chain are adjacent to one lubricating D-shaped pin shaft (5), a check ring (6) is arranged at the outer side position of the check ring pin shaft (9), two adjacent lubricating D-shaped pin shafts (5) and check ring pin shafts (9) are connected together through a shaft chain plate (7) and an S-shaped outer chain plate (8), the shaft chain plate (7), the S-shaped outer chain plate (8) and the outer chain plate (10) are formed into the outer chain plate (4), a self-lubricating structure is arranged between the sleeve structure (2) and the roller structure (3) with the sealing cover, the self-lubricating structure comprises the lubricating D-shaped pin shaft (5) and one side of the check ring pin shafts (9) which are provided with the lubricating cup-shaped oil injection grooves (12) which are matched with the inner side of the bearing cup (12), the lubricating oil storage tank (51) is communicated with the lubricating liquid conveying hole through a cylindrical lubricating transition fit hole, the inner chain plate (1) with the end faces on two sides of the roller structure (3) with the sealing cover are connected with the outer chain plate (4) through a first sealing gasket (11) and a second sealing gasket (13), the left side position of the lower end of the first sealing gasket (11) and the left side position of the upper end of the second sealing gasket (13) are respectively provided with an S-shaped air hole groove with the same size, the S-shaped air hole grooves are communicated with the outer cylindrical surface and the inner central hole of the first sealing gasket (11) or the second sealing gasket (13), and the fit position of the inner cylindrical surface of the sleeve structure (2) and the lubricating oil storage tank (51) is provided with an arc-shaped lubricating oil transition fit safe and smooth groove (16).
2. The chain for an equal step distance convenient maintenance outer ladder of claim 1, wherein: the self-lubricating structure between the sleeve structure (2) and the roller structure (3) with the sealing cover is a self-lubricating bearing.
3. The chain for an equal step distance convenient maintenance outer ladder of claim 2, wherein: the press-fit type pressure oil filling cup (12) performs reset operation during pressure filling through the structure of a reset spring.
4. The chain for an equal step distance convenient maintenance outer ladder of claim 2, wherein: the depth of the S-shaped air hole groove is half of the thickness of the first sealing gasket (11).
5. The chain for an equal step distance convenient maintenance outer ladder of claim 2, wherein: the sleeve structure (2) is provided with a safe and effective hardening layer, and the thickness of the safe and effective hardening layer is 0.4-0.7mm.
6. The chain for an equal step distance convenient maintenance outer ladder of claim 2, wherein: the outer surfaces of the lubrication D-shaped pin shaft (5) and the check ring pin shaft (9) are provided with hardening protection layers, and the thickness of each hardening protection layer is 0.6-0.9mm.
7. The chain for an equal step distance convenient maintenance outer ladder of claim 2, wherein: the heat treatment hardness of the outer chain plate (4) is larger than that of the inner chain plate (1).
CN202111454281.4A 2021-12-01 2021-12-01 Chain for constant-step-distance convenient maintenance outdoor ladder Active CN114110089B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111454281.4A CN114110089B (en) 2021-12-01 2021-12-01 Chain for constant-step-distance convenient maintenance outdoor ladder

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111454281.4A CN114110089B (en) 2021-12-01 2021-12-01 Chain for constant-step-distance convenient maintenance outdoor ladder

Publications (2)

Publication Number Publication Date
CN114110089A CN114110089A (en) 2022-03-01
CN114110089B true CN114110089B (en) 2023-05-09

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Application Number Title Priority Date Filing Date
CN202111454281.4A Active CN114110089B (en) 2021-12-01 2021-12-01 Chain for constant-step-distance convenient maintenance outdoor ladder

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Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1258753A (en) * 1968-01-25 1971-12-30
JP2006316828A (en) * 2005-05-10 2006-11-24 Tsubakimoto Chain Co Chain with oil reservoir
JP2009236149A (en) * 2008-03-26 2009-10-15 Honda Motor Co Ltd Chain transmission device with lubricating structure
JP5518008B2 (en) * 2011-07-29 2014-06-11 株式会社椿本チエイン Conveyor chain
CN105317929A (en) * 2015-11-27 2016-02-10 苏州环球集团科技股份有限公司 Lubrication-free step chain
CN105317928A (en) * 2015-11-27 2016-02-10 苏州环球集团科技股份有限公司 Lubricating and sealing structure of step chain
CN109502464A (en) * 2018-12-20 2019-03-22 杭州斯沃德电梯有限公司 A kind of main drive of escalator
CN112173935A (en) * 2020-08-20 2021-01-05 环球传动泰州有限公司 Waterproof step chain with special structure
CN112429620A (en) * 2020-12-14 2021-03-02 杭州自强链传动有限公司 Self-lubricating environment-friendly footboard chain

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