Vibration damping pad, step sprocket with the vibration damping pad, and escalator using the sprocket.

Abstract

This invention discloses a shock-absorbing pad for a ladder sprocket, comprising a rigid, wear-resistant core and an elastic plug fixedly connected. The rigid, wear-resistant core includes a head for bearing chain impact and a connecting portion located below the head. The upper part of the elastic plug covers the outside of the connecting portion of the rigid, wear-resistant core, and its top end abuts against the head of the rigid, wear-resistant core. The rigid, wear-resistant core has a first through hole penetrating the head and the connecting portion. Correspondingly, the lower part of the elastic plug has a second through hole communicating with the first through hole and extending to the bottom end of the elastic plug. The lower part of the elastic plug has a tight-fitting step. The shock-absorbing pad of this invention adopts a composite structure combining a rigid, wear-resistant core and an elastic plug, which is not easily worn, has a long service life, and provides good shock absorption. When the shock-absorbing pad is installed on a ladder sprocket, it can effectively reduce the vibration and noise when the ladder sprocket collides with the chain. Correspondingly, this invention also provides a ladder sprocket with the shock-absorbing pad and an escalator using the sprocket.

Description

Technical Field

[0001] This invention relates to the technical field of escalators and their accessories, specifically to shock-absorbing pads, step sprockets with the shock-absorbing pads, and escalators using the sprockets. Background Technology

[0002] Escalators, characterized by their large transport capacity, durability, and smooth operation, are widely used in high-traffic public places such as shopping malls, airports, and subway stations for the continuous transport of people. The step sprockets are primarily used to drive the escalator, propelling the step chain and steps. During the escalator's circulation, the upper step sprocket transmits power to the lower step sprocket via chain drive to steer. Currently, most step sprockets are made of rigid materials, which cause impact when the chain meshes with the sprocket teeth, resulting in vibration and noise. This significantly reduces the comfort of riding the escalator and also causes wear on related components.

[0003] In existing technologies, shock-absorbing pads are typically installed in the tooth grooves of the step sprocket teeth to reduce vibration and noise generated when the chain meshes with the step sprocket. For example, Chinese Patent ZL 201620713336.7 discloses a step sprocket for escalators with shock-absorbing pads, including a sprocket body with teeth on its outer periphery, and shock-absorbing pads provided on the tooth surfaces of the teeth, with shock-absorbing pads provided on the tooth surfaces on both sides of the same tooth; Chinese Patent ZL 201721686707.8 discloses a step sprocket for escalators, including a sprocket body with teeth on its outer periphery, and shock-absorbing pads provided in the tooth grooves of each tooth. However, current shock-absorbing pads are made entirely of plastic (usually TPU, see structure). Figure 4 They are prone to wear and tear, and the shock-absorbing pads may undergo permanent deformation under continuous impact from the chain, resulting in a short service life. In addition, according to feedback from OEMs, the shock absorption effect of existing shock-absorbing pads is not ideal and needs to be improved. Summary of the Invention

[0004] The purpose of this application is to provide a shock-absorbing pad for a ladder sprocket, overcoming the aforementioned problems in the prior art. The shock-absorbing pad for the ladder sprocket of this application adopts a composite structure combining a hard, wear-resistant core and an elastic rubber plug, which is not easily worn, has a long service life, and provides good shock absorption. When this shock-absorbing pad is installed on the ladder sprocket, it can effectively reduce the vibration and noise when the ladder sprocket collides with the chain. Correspondingly, this application also provides a ladder sprocket with this shock-absorbing pad, and an escalator using this ladder sprocket.

[0005] Regarding the shock-absorbing pad, the technical solution of this application is as follows: a shock-absorbing pad for a ladder sprocket, comprising a rigid wear-resistant core and an elastic rubber plug fixedly connected; the rigid wear-resistant core includes a head for bearing chain impact and a connecting portion located below the head; the upper part of the elastic rubber plug covers the outside of the connecting portion of the rigid wear-resistant core, and its top end abuts against the head of the rigid wear-resistant core; the rigid wear-resistant core is provided with a first through hole penetrating the head and the connecting portion, and correspondingly, the lower part of the elastic rubber plug has a second through hole communicating with the first through hole and extending to the bottom end of the elastic rubber plug; the lower part of the elastic rubber plug is provided with a tight-fitting step.

[0006] Compared with the prior art, the shock-absorbing pad for the step sprocket of this application adopts a composite structure combining a hard wear-resistant core and an elastic rubber plug. The hard wear-resistant core has high strength, good toughness, and is not easily worn, giving the shock-absorbing pad good wear resistance and a long service life. The elastic rubber plug has elasticity and good buffering performance, giving the shock-absorbing pad better shock absorption effect and less vibration and noise during operation. When the shock-absorbing pad for the step sprocket of this application is installed on the step sprocket, it can effectively reduce the vibration and noise generated by the collision between the step sprocket and the chain during escalator operation. In addition, a through hole is provided inside the hard wear-resistant core and the elastic rubber plug, and a second through hole is provided inside the elastic rubber plug. The design provides deformation space for the elastic plug, resulting in strong elastic deformation capability. When the elastic plug deforms, the air inside the through hole is compressed and discharged from the first through hole inside the hard wear-resistant core, ensuring that the elastic plug can undergo smooth elastic deformation and further improving the shock absorption effect. Moreover, the through hole design saves manufacturing materials and helps control costs. The design of a tight-fitting step at the bottom of the elastic plug serves two purposes. First, the tight-fitting step is used to interfere with the mounting hole on the sprocket, which serves to fix the shock-absorbing pad. Second, the small radial dimension of the elastic plug above the tight-fitting step also provides space for the elastic plug to deform outward, which is conducive to obtaining a better shock absorption effect.

[0007] As an optimization, in the aforementioned shock-absorbing pad for the stepped sprocket, the connecting part is provided with a step, forming a barb. The barb structure on the connecting part can improve the bonding strength between the hard wear-resistant core and the elastic rubber plug, preventing the hard wear-resistant core from detaching from the elastic rubber plug during use, thus improving the reliability of the shock-absorbing pad and further extending its service life. Furthermore, on the connecting part, below the barb, there is a first inwardly inclined step surface, forming an inverted frustum structure. The convergent structure below the barb can further improve the bonding strength between the elastic rubber plug and the hard wear-resistant core. After the hard wear-resistant core converges, its radial dimension decreases, allowing the radial thickness of the elastic rubber plug at the corresponding position to be designed to be larger, enabling it to withstand greater impact forces and extending its service life.

[0008] As an optimization, in the aforementioned shock-absorbing pad for the ladder sprocket, the edge of the tight-fitting step is provided with a set of circumferentially distributed arc grooves. When the shock-absorbing pad of this application is installed on the ladder sprocket, the shock-absorbing pad and the mounting hole on the ladder sprocket are interference-fitted; the arc grooves on the edge of the tight-fitting step of the elastic plug make the assembly of the shock-absorbing pad easier.

[0009] As an optimization, in the aforementioned shock-absorbing pad for the ladder sprocket, the lower end of the elastic rubber plug has a second inwardly converging inclined step surface, forming an inverted frustum structure. When the shock-absorbing pad is assembled onto the ladder sprocket, its bottom step surface can act as a guide, making installation easier. After installation, the step surface mates with the bottom conical surface of the mounting hole on the sprocket to form a more stable positioning. Furthermore, the convergence angle α of the second inclined step surface is the same as the cone angle at the bottom of the mounting hole on the ladder sprocket. Furthermore, the second through hole is a stepped hole that is larger at the top and smaller at the bottom. This design allows the bottom of the elastic rubber plug to have a larger radial dimension, thereby generating a greater rebound force after the rubber plug undergoes elastic deformation, further improving the shock absorption capacity.

[0010] As an optimization, in the aforementioned shock-absorbing pad for the stepped sprocket, the hard wear-resistant core is made of PA66 GF30 material, and the elastic plug is made of nitrile rubber with a hardness of HA75-80; the elastic plug and the hard wear-resistant core are bonded together as a whole through vulcanization. The hard wear-resistant core is made of PA66 GF30 (nylon), and the elastic plug is made of nitrile rubber with a specific hardness; the two are bonded together through vulcanization. The mechanical strength of the shock-absorbing pad meets the requirements. During operation, the hard wear-resistant core is not prone to permanent deformation or wear, nor will it detach from the elastic plug, resulting in high reliability. Furthermore, the elastic plug has strong elastic deformation capacity, leading to good shock absorption performance of the shock-absorbing pad.

[0011] For a ladder sprocket, the technical solution of this application is as follows: A ladder sprocket includes a sprocket body; the outer periphery of the sprocket body is provided with teeth, and a tooth groove is formed between adjacent teeth; each tooth groove is provided with a shock-absorbing pad; the shock-absorbing pad includes a hard wear-resistant core and an elastic rubber plug fixedly connected; the hard wear-resistant core includes a head for bearing chain impact and a connecting part provided on the lower side of the head; the upper part of the elastic rubber plug covers the outside of the connecting part of the hard wear-resistant core, and the top end abuts against the head of the hard wear-resistant core; the hard wear-resistant core is provided with a first through hole penetrating the head and the connecting part, and correspondingly, the lower part of the elastic rubber plug has a second through hole communicating with the first through hole and extending to the bottom end of the elastic rubber plug; the lower part of the elastic rubber plug is provided with a tight-fitting step.

[0012] Compared with the prior art, the step sprocket of this application has a shock-absorbing pad set in the tooth groove. This allows the chain to collide with the shock-absorbing pad first during the meshing process with the step sprocket. After being buffered by the shock-absorbing pad, the chain then contacts the tooth groove of the step sprocket. This avoids direct rigid collision between the chain and the step sprocket. Moreover, the shock-absorbing pad adopts a composite structure combining a hard wear-resistant core and an elastic rubber plug, which has good wear resistance and shock absorption effect. This greatly reduces the vibration and noise caused by the impact between the chain and the tooth groove of the step sprocket, and improves the riding comfort of the escalator.

[0013] As an optimization, the aforementioned stepped sprocket is equipped with two damping pads in each tooth groove, symmetrically arranged on both sides of the groove wall. This results in better damping; when the chain engages with the stepped sprocket, it sequentially contacts the two damping pads, thereby expanding the range of motion for the damping pads to exert their damping effect, effectively reducing vibration during chain-step sprocket contact, and lowering noise generated by collisions during contact.

[0014] Regarding escalators, the technical solution of this application is: an escalator, including a step sprocket and a step chain meshing with the step sprocket; the step sprocket is the aforementioned step sprocket of this application.

[0015] Compared with the prior art, the escalator of this application has high safety and good comfort; by setting shock-absorbing pads on the step sprockets, the chain and the step sprockets will not directly collide rigidly during the gradual meshing process, thus resulting in less vibration and noise during escalator operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the shock-absorbing pad for the ladder sprocket in this application;

[0017] Figure 2 This is a top view of the shock-absorbing pad for the ladder sprocket in this application;

[0018] Figure 3 This is a schematic diagram of the hard wear-resistant core in this application;

[0019] Figure 4 This is a schematic diagram of the structure of a shock-absorbing pad in the existing technology.

[0020] The markings in the attached figure are as follows: 1-hard wear-resistant core, 101-head, 102-connecting part, 1021-barb, 1022-first inclined step surface, 103-first through hole; 2-elastic rubber plug, 201-second through hole, 202-tightly fitting step, 2021-circular arc groove, 203-second inclined step surface. Detailed Implementation

[0021] The present application will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the present application.

[0022] See Figures 1 to 3 A shock-absorbing pad for a ladder sprocket includes a hard, wear-resistant core 1 and an elastic rubber plug 2 fixedly connected. The hard, wear-resistant core 1 includes a head 101 for bearing chain impact and a connecting portion 102 located on the lower side of the head 101. The upper part of the elastic rubber plug 2 covers the outside of the connecting portion 102 of the hard, wear-resistant core 1 (during manufacturing, the hard, wear-resistant core 1 can be injection molded first, then the finished hard, wear-resistant core 1 can be placed in a mold, rubber can be injected into the mold, and finally vulcanized to obtain the product), and its top end abuts against the head 101 of the hard, wear-resistant core 1. The hard, wear-resistant core 1 is provided with a first through hole 103 penetrating the head 101 and the connecting portion 102. Correspondingly, the lower part of the elastic rubber plug 2 has a second through hole 201 that communicates with the first through hole 103 and extends to the bottom end of the elastic rubber plug 2 (the second through hole 201 and the first through hole 103 can be coaxially arranged). The lower part of the elastic rubber plug 2 is provided with a tight-fitting step 202.

[0023] Example:

[0024] In this embodiment, the connecting portion 102 is provided with a step, forming a barb 1021. The barb 1021 on the connecting portion 102 improves the bonding strength between the hard wear-resistant core 1 and the elastic rubber stopper 2, preventing the hard wear-resistant core 1 from detaching from the elastic rubber stopper 2 during use, thus improving the reliability of the shock-absorbing pad and further extending its service life. Furthermore, below the barb 1021, the connecting portion 102 has an inwardly converging first inclined step surface 1022, forming an inverted frustum structure. The converging structure below the barb 1021 further improves the bonding strength between the elastic rubber stopper 2 and the hard wear-resistant core 1. After the hard wear-resistant core 1 converges, its radial dimension decreases, allowing the radial thickness of the elastic rubber stopper 2 at the corresponding position to be designed to be larger, enabling it to withstand greater impact forces and extending its service life.

[0025] In this embodiment, the edge of the tight-fitting step 202 is provided with eight circumferentially distributed arc grooves 2021. When the shock-absorbing pad of this application is installed on the step sprocket, the mounting hole on the shock-absorbing pad and the step sprocket are interference-fitted; the arc grooves 2021 on the edge of the tight-fitting step 202 of the elastic plug 2 make the assembly of the shock-absorbing pad easier.

[0026] Furthermore, the eight arc grooves 2021 are evenly distributed along the same circumference. The even distribution of the arc grooves 2021 along the circumference ensures that the force among the arc grooves 2021 is balanced. When the elastic rubber stopper 2 is squeezed, its overall force is balanced and it is not easily damaged.

[0027] In this embodiment, the second through hole 201 is a stepped hole that is larger at the top and smaller at the bottom. This design allows the bottom of the elastic plug 2 to have a larger radial dimension, thereby generating a greater rebound force after the elastic plug 2 undergoes elastic deformation, further improving the shock absorption capacity.

[0028] In this embodiment, the lower end of the elastic rubber plug 2 has a second inclined step surface 203 that slopes inward and converges, forming an inverted frustum structure. When the shock-absorbing pad is assembled onto the ladder sprocket, the step surface at its bottom can act as a guide, making installation easier. After installation, the step surface and the bottom conical surface of the mounting hole on the sprocket cooperate to form a positioning, which is more stable. Furthermore, the convergence angle α of the second inclined step surface 203 is the same as the cone angle at the bottom of the mounting hole on the ladder sprocket (in this embodiment, the convergence angle α is 116°).

[0029] In this embodiment, the hard wear-resistant core 1 is made of PA66 GF30 material (i.e., reinforced nylon containing 30% glass fiber), with a hardness in the range of HD85-90; the elastic rubber stopper 2 is made of nitrile rubber, with a hardness in the range of HA75-80; the elastic rubber stopper 2 and the hard wear-resistant core 1 are bonded together as a whole by vulcanization. The hard wear-resistant core 1 is made of PA66 GF30 (nylon), and the elastic rubber stopper 2 is made of nitrile rubber with a specific hardness. The two are bonded together by vulcanization, ensuring the mechanical strength of the shock-absorbing pad meets the requirements. During operation, the hard wear-resistant core 1 is not prone to permanent deformation or wear, nor will it detach from the elastic rubber stopper 2, resulting in high reliability. Furthermore, the elastic rubber stopper 2 has strong elastic deformation capability, leading to good shock absorption performance of the shock-absorbing pad.

[0030] As a specific application of the shock-absorbing pad of this application: a stepped sprocket includes a sprocket body; the outer periphery of the sprocket body is provided with teeth, and a tooth groove is formed between adjacent teeth; a shock-absorbing pad is provided in each tooth groove; the shock-absorbing pad includes a hard wear-resistant core 1 and an elastic rubber plug 2 fixedly connected; the hard wear-resistant core 1 includes a head 101 for bearing chain impact and a connecting part 102 provided on the lower side of the head 101; the upper part of the elastic rubber plug 2 covers the outside of the connecting part 102 of the hard wear-resistant core 1, and the top end abuts against the head 101 of the hard wear-resistant core 1; the hard wear-resistant core 1 is provided with a first through hole 103 penetrating the head 101 and the connecting part 102, and correspondingly, the lower part of the elastic rubber plug 2 has a second through hole 201 communicating with the first through hole 103 and extending to the bottom end of the elastic rubber plug 2; the lower part of the elastic rubber plug 2 is provided with a tight-fitting step 202.

[0031] When assembling the shock-absorbing pad with the stepped sprocket, firstly, a mounting hole is opened in the tooth groove of the stepped sprocket, and then the shock-absorbing pad is installed into the mounting hole. After installation, the entire elastic plug 2 is embedded in the mounting hole, and the head 101 of the hard wear-resistant core 1 protrudes above the opening of the mounting hole. The second inclined step surface 203 at the lower end of the elastic plug 2 cooperates with the conical surface at the bottom of the mounting hole on the sprocket to form a positioning. The tight-fitting step 202 on the outer side of the elastic plug 2 is interference-fitted with the mounting hole to fix the shock-absorbing pad and prevent the shock-absorbing pad from coming out of the mounting hole.

[0032] As the chain gradually engages with the step sprocket, the chain first contacts the head 101 of the hard wear-resistant core 1, compressing the hard wear-resistant core 1 and the elastic plug 2. The air in the second through hole 201 on the elastic plug 2 is compressed and discharged from the first through hole 103 inside the hard wear-resistant core 1, ensuring that the elastic plug 2 can undergo elastic deformation smoothly, thereby playing a role in shock absorption. After being damped by the shock-absorbing pad, the chain then contacts the step sprocket, avoiding direct rigid collision between the chain and the step sprocket, thus reducing the vibration and noise generated during escalator operation.

[0033] As a specific embodiment of the ladder sprocket: each tooth groove is provided with two damping pads, which are symmetrically arranged on both sides of the groove wall (the included angle between the two damping pads can be 90°). In this case, the damping effect is better; when the chain meshes with the ladder sprocket, it will come into contact with the two damping pads in sequence, thereby expanding the stroke range of the damping pads to play a damping role, effectively reducing the vibration when the chain contacts the ladder sprocket, and reducing the noise generated by the collision during contact.

[0034] As a specific application of the step sprocket: an escalator includes a step sprocket and a step chain meshing with the step sprocket; the step sprocket is the aforementioned step sprocket of this application.

[0035] The foregoing general description of the invention and its specific embodiments should not be construed as a limitation on the technical solution of the invention. Those skilled in the art, based on the disclosure of this application, can add, reduce, or combine the disclosed technical features in the foregoing general description and / or specific embodiments (including examples) without departing from the constituent elements of the invention, to form other technical solutions within the scope of protection of this application.

Claims

1. A shock-absorbing pad for a stepped sprocket, characterized in that: The device includes a rigid wear-resistant core (1) and an elastic rubber plug (2) that are fixedly connected. The rigid wear-resistant core (1) includes a head (101) for bearing chain impact and a connecting part (102) located on the lower side of the head (101). The upper part of the elastic rubber plug (2) covers the outside of the connecting part (102) of the rigid wear-resistant core (1), and its top end abuts against the head (101) of the rigid wear-resistant core (1). The rigid wear-resistant core (1) is provided with a first through hole (103) that penetrates the head (101) and the connecting part (102). Correspondingly, the lower part of the elastic rubber plug (2) has a connection with the first through hole (103) and extends to the bottom end of the elastic rubber plug (2). The second through hole (201); the second through hole (201) and the first through hole (103) are coaxially arranged; the lower part of the elastic rubber plug (2) is provided with a tight-fitting step (202); the connecting part (102) is provided with a step to form a barb (1021); the connecting part (102) has an inwardly inclined and converging first inclined step surface (1022) below the barb (1021) to form an inverted frustum structure; the edge of the tight-fitting step (202) is provided with a set of circumferentially distributed arc grooves (2021); the second through hole (201) is a stepped hole with a larger upper part and a smaller lower part; the hard wear-resistant core (1) is made of PA66 GF30 material, and the elastic rubber plug (2) is made of nitrile rubber with a hardness of HA75~80; the elastic rubber plug (2) and the hard wear-resistant core (1) are bonded together by vulcanization.

2. The shock-absorbing pad for a stepped sprocket according to claim 1, characterized in that: The lower end of the elastic rubber plug (2) has a second inclined step surface (203) that slopes inward and converges, forming an inverted frustum structure.

3. A stepped sprocket, comprising a sprocket body; the outer periphery of the sprocket body is provided with teeth, and a tooth groove is formed between adjacent teeth; characterized in that: Each tooth groove is provided with a shock-absorbing pad; the shock-absorbing pad includes a fixedly connected hard wear-resistant core (1) and an elastic rubber plug (2); the hard wear-resistant core (1) includes a head (101) for bearing chain impact and a connecting part (102) provided on the lower side of the head (101); the upper part of the elastic rubber plug (2) covers the outside of the connecting part (102) of the hard wear-resistant core (1), and the top end abuts against the head (101) of the hard wear-resistant core (1); the hard wear-resistant core (1) is provided with a first through hole (103) penetrating the head (101) and the connecting part (102), and correspondingly, the lower part of the elastic rubber plug (2) has a connection with the first through hole (103) and extends to the elastic rubber plug (2). The second through hole (201) at the bottom of the rubber plug (2); the second through hole (201) and the first through hole (103) are coaxially arranged; the lower part of the elastic rubber plug (2) is provided with a tight-fitting step (202); the connecting part (102) is provided with a step to form a barb (1021); the connecting part (102) has an inwardly inclined and converging first inclined step surface (1022) below the barb (1021) to form an inverted frustum structure; the edge of the tight-fitting step (202) is provided with a set of circumferentially distributed arc grooves (2021); the second through hole (201) is a stepped hole with a larger upper part and a smaller lower part; the hard wear-resistant core (1) is made of PA66 GF30 material, and the elastic rubber plug (2) is made of nitrile rubber with a hardness of HA75~80; the elastic rubber plug (2) and the hard wear-resistant core (1) are bonded together by vulcanization.

4. The stepped sprocket according to claim 3, characterized in that: Each tooth groove is provided with two shock-absorbing pads, which are symmetrically arranged on both sides of the groove wall.

5. An escalator, comprising step sprockets and step chains meshing with the step sprockets; characterized in that: The ladder sprocket is the ladder sprocket as described in claim 3.

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