Elevator door change gear and forming process thereof
By using polyurethane flexible wear-resistant noise-reducing components and a movable buffer ring structure in the elevator door rollers, the problems of high noise and easy wear in the existing technology are solved, achieving a longer service life and lower noise effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NINGBO XINLUN MACHINERY TECHNOLOGY CO LTD
- Filing Date
- 2026-02-03
- Publication Date
- 2026-05-12
AI Technical Summary
Existing elevator door rollers are noisy, wear out easily, and have a short service life.
The flexible, wear-resistant noise-reducing component made of polyurethane is integrally molded with a nylon skeleton, combined with a movable buffer ring structure to reduce noise and extend service life.
It effectively reduces noise, extends service life, and improves the wear resistance and service life of the pulleys.
Smart Images
Figure CN122009941A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of elevator component technology, and more specifically to an elevator door hanger and its molding process. Background Technology
[0002] A home elevator is a small lifting device designed specifically for private residential environments and used by family members to move between different floors within a residence. It includes rollers, which are wheel structures that cooperate with the elevator door guide rail. During the opening and closing of the elevator door, the elevator door rollers are always in frictional contact with the door guide rail.
[0003] An elevator door roller is provided, comprising a roller body, a bearing, and a frame. The frame has a central hole and an annular groove, and the bearing is disposed within the central hole. In use, the outer door guide rail extends into the annular groove and contacts the groove wall. It should be noted that the frame is made of nylon. However, in actual use, the outer door guide rail generates more noise when in contact with the groove wall and is more prone to wear due to the completely hard contact.
[0004] Therefore, there is a need for an elevator door roller with a longer service life and lower noise, as well as its molding process. Summary of the Invention
[0005] The main objective of this application is to provide an elevator door roller, wherein the elevator door roller includes a roller body, the roller body includes a bearing, a frame, and a flexible wear-resistant noise-reducing component. The frame has a central hole, in which the bearing is disposed. The outer side of the frame has a first annular groove, and the flexible wear-resistant noise-reducing component is disposed within the first annular groove. The outer wall of the flexible wear-resistant noise-reducing component has a second annular groove. The flexible wear-resistant noise-reducing component is made of polyurethane, and the frame is made of nylon. By incorporating the flexible wear-resistant noise-reducing component, the service life of the roller body is extended and the noise is reduced.
[0006] Another objective of this application is to provide an elevator door hanger, wherein the number of the frame and the flexible wear-resistant noise reduction component is one, the flexible wear-resistant noise reduction component is injection molded, and the bearing, the frame and the flexible wear-resistant noise reduction component are injection molded as a single unit, thereby realizing the forming of the hanger body.
[0007] Another objective of this application is to provide an elevator door roller, wherein the frame includes a first rib, multiple second ribs, and a blocking rib. The flexible wear-resistant and noise-reducing component includes two first buffer rings and second buffer rings. The first rib has multiple first sliding grooves and first annular grooves arranged in a circular array. A second rib is slidably disposed in each of the first sliding grooves. One end of the first sliding groove has an opening. The blocking rib is detachably connected to the first rib and closes the opening. Two first buffer rings are disposed in the first annular groove. The two first buffer rings are arranged opposite to each other, and both first buffer rings have a second annular groove. The outer wall of the second rib has a third annular groove. The second buffer ring is disposed in the third annular groove. When the second rib slides in the first sliding groove, the middle section or end of the second buffer ring is located between the two first buffer rings, so that the second buffer ring always moves when the roller body rotates, further extending its service life.
[0008] Another objective of this application is to provide a molding process for an elevator door hanger, wherein the process for molding the aforementioned elevator door hanger is characterized by: firstly, using an injection molding machine to inject molten polyurethane plastic into a mold and injection mold it into the flexible wear-resistant and noise-reducing part; then, placing the bearing and the flexible wear-resistant and noise-reducing part into another mold, and injecting molten nylon plastic into the mold and injection molding the hanger body.
[0009] To achieve at least one of the above-mentioned inventive objectives, this application provides an elevator door roller, wherein the elevator door roller comprises: The roller body includes a bearing, a frame, and a flexible wear-resistant noise reduction component. The frame has a central hole in which the bearing is disposed. The outer side of the frame has a first annular groove, and the flexible wear-resistant noise reduction component is disposed in the first annular groove. The outer side wall of the flexible wear-resistant noise reduction component has a second annular groove. The flexible wear-resistant noise reduction component is made of polyurethane, and the frame is made of nylon.
[0010] In one or more embodiments of this application, the number of the skeleton and the flexible wear-resistant noise reduction component is one, the flexible wear-resistant noise reduction component is injection molded, and the bearing, the skeleton and the flexible wear-resistant noise reduction component are injection molded as a single unit.
[0011] In one or more embodiments of this application, the skeleton includes a first bone body, a plurality of second bones bodies, and a blocking bone body. The flexible wear-resistant noise reduction component includes two first buffer rings and second buffer rings. The first bone body has a plurality of first sliding grooves and a first annular groove arranged in a ring array. A second bone body is slidably disposed in each of the first sliding grooves. One end of the first sliding groove has an opening. The blocking bone body is detachably connected to the first bone body and closes the opening. Two first buffer rings are disposed in the first annular groove. The two first buffer rings are arranged opposite to each other, and both first buffer rings have a second annular groove. The outer side wall of the second bone body has a third annular groove. The second buffer ring is disposed in the third annular groove. When the second bone body slides in the first sliding groove, the middle section or end of the second buffer ring is located between the two first buffer rings.
[0012] In one or more embodiments of this application, the elevator door roller further includes a fixed rod, a sliding sleeve, a following member, and a clutch structure. The fixed rod passes through the bearing, and the sliding sleeve is slidably disposed on the fixed rod along the axial direction of the fixed rod. The following member is connected to the first bone body through the clutch structure. When the first bone body rotates circumferentially, the following member rotates circumferentially in tandem. The following member is threadedly connected to the sliding sleeve. One end of the sliding sleeve has a fourth annular groove, and the end of the second bone body has a first extension end. The first extension end extends out of the first sliding groove and into the fourth annular groove.
[0013] In one or more embodiments of this application, the clutch structure includes an armature and an electromagnet. The elevator door roller also includes two fixed frames, which are located at both ends of the fixed rod and fixedly connected to the fixed rod. The blocking rib and the first rib each have a second sliding groove at the end opposite to the blocking rib. The armature is slidably disposed in the second sliding groove. The armature has a first limiting groove with a notch. The following member has a second extension end. The blocking rib and the first rib each have a third extension end at the end with the second sliding groove. The second extension end and the third extension end both extend into the first limiting groove. The thickness of the third extension end is greater than the thickness of the second extension end. The electromagnet is disposed on the fixed frame and close to the armature. When the electromagnet is energized, the armature moves toward the electromagnet and causes the second extension end to disengage from the first limiting groove, while one end of the third extension end remains in the first limiting groove.
[0014] In one or more embodiments of this application, the clutch structure further includes an elastic reset member, one end of which is connected to the armature member, and the other end of which is connected to the blocking bone or the first bone.
[0015] In one or more embodiments of this application, the fixed rod is provided with a limit switch, and both ends of the sliding sleeve are provided with a limit switch.
[0016] To achieve at least one of the above-mentioned objectives, this application provides a molding process for an elevator door hanger, used to mold the aforementioned elevator door hanger, wherein the molding process for the elevator door hanger includes: First, molten polyurethane plastic is injected into a mold using an injection molding machine and molded into the flexible wear-resistant and noise-reducing part. Then, the bearing and the flexible wear-resistant and noise-reducing part are placed in another mold, and molten nylon plastic is injected into the mold and molded into the wheel body.
[0017] In one or more embodiments of this application, when injecting molten nylon plastic into the mold, the mold temperature of the injection molding machine is 80℃~120℃, the drying temperature is 80℃~120℃, the drying time of the desiccant is 4~6 hours, the injection temperature of the nozzle is 270℃~290℃, the temperature of the front injection section is 270℃~280℃, the temperature of the middle injection section is 260℃~270℃, and the temperature of the rear injection section is 240℃~250℃.
[0018] In this embodiment, firstly, by setting a flexible, wear-resistant, and noise-reducing component on the outside of the frame, the wear and noise of the outer door guide rail on the frame are reduced; secondly, by setting a movable second buffer ring, and by ensuring that the second buffer ring always moves when the main body of the pulley rotates circumferentially, the contact area between the outer door guide rail and the second buffer ring is constantly changing, thereby reducing the overall wear of the second buffer ring and further improving its service life. Attached Figure Description
[0019] These and / or other aspects and advantages of this application will become clearer and more readily understood from the following detailed description of embodiments of this application taken in conjunction with the accompanying drawings, wherein: Figure 1 The figure shows a structural schematic diagram of an elevator door hanger according to the first embodiment of this application; Figure 2 The figure shows a structural schematic diagram of an elevator door hanger according to the second embodiment of this application; Figure 3 The diagram shows a schematic of the clutch mechanism. Figure 4 The diagram shows a schematic of the armature component. Detailed Implementation
[0020] The terms and words used in the following specification and claims are not limited to their literal meaning, but are used solely by the inventors to enable a clear and consistent understanding of this application. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of this application is provided for illustrative purposes only and not for the purpose of limiting the application as defined in the appended claims and their equivalents.
[0021] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.
[0022] While ordinal numbers such as "first," "second," etc., will be used to describe various components, this does not limit which components are used. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component, without departing from the teachings of the inventive concept. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.
[0023] The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will also be understood that the terms “comprising” and / or “having” as used in this specification specify the presence of the described features, numbers, steps, operations, components, elements or combinations thereof, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements or groups thereof.
[0024] Indicative elevator door rollers, for reference. Figures 1 to 4 According to any preferred embodiment of the present invention, an elevator door hanger includes a hanger body 10. The hanger body 10 includes a bearing 101, a frame 102, and a flexible wear-resistant noise reduction component 103. The frame 102 has a central hole 1021, in which the bearing 101 is disposed. The outer side of the frame 102 has a first annular groove 1022. The flexible wear-resistant noise reduction component 103 is disposed in the first annular groove 1022. The outer side wall of the flexible wear-resistant noise reduction component 103 has a second annular groove 1031. The flexible wear-resistant noise reduction component 103 is made of polyurethane, and the frame 102 is made of nylon.
[0025] It should be noted that by providing the flexible wear-resistant noise reduction component 103 on the groove wall of the first annular groove 1022, the outer door guide rail contacts the flexible wear-resistant noise reduction component 103 during actual use. Since the flexible wear-resistant noise reduction component 103 is made of polyurethane, which possesses the elasticity of rubber and the strength of plastic, when the outer door guide rail scratches the surface of the flexible wear-resistant noise reduction component 103, the flexible wear-resistant noise reduction component 103 will first undergo elastic deformation. After the stress passes, the polyurethane will return to its original shape, effectively reducing the risk of the flexible wear-resistant noise reduction component 103 being scratched by the outer door guide rail. Furthermore, during this elastic deformation, the flexible wear-resistant noise reduction component 103 absorbs and dissipates vibration energy, making it difficult for the impact force to be converted into sound, thus reducing the overall noise. It is evident that compared to existing technologies, it has the advantages of a longer service life and lower noise.
[0026] Furthermore, in the first embodiment of this application, as Figure 1 As shown, there is one skeleton 102 and one flexible wear-resistant noise reduction component 103. The flexible wear-resistant noise reduction component 103 is injection molded, and the bearing 101, the skeleton 102 and the flexible wear-resistant noise reduction component 103 are injection molded as a single unit.
[0027] It should be noted that in the first embodiment, the flexible wear-resistant noise reduction part 103 is first injection molded, and then the bearing 101 is placed in the corresponding position, and then injection molded again.
[0028] Figure 2 The illustration shows a second embodiment of this application. In the second embodiment, the skeleton 102 includes a first bone 1023, a plurality of second bones 1024, and a blocking bone 1025. The flexible wear-resistant noise reduction component 103 includes two first buffer rings 1032 and two buffer rings 1033. The first bone 1023 has a plurality of first grooves 1026 and first annular grooves 1022 arranged in a ring array. A second bone 1024 is slidably disposed in each of the first grooves 1026. One end of the first groove 1026 has an opening. The blocking bone 1025 is connected to the first bone 1023. 023 Disassemble and close the opening. The first annular groove 1022 is provided with two first buffer rings 1032, which are arranged opposite to each other. Both first buffer rings 1032 have a second annular groove 1031. The outer wall of the second bone 1024 has a third annular groove 10241, and the third annular groove 10241 is provided with a second buffer ring 1033. When the second bone 1024 slides in the first sliding groove 1026, the middle section or end of the second buffer ring 1033 is located between the two first buffer rings 1032.
[0029] It should be noted that when the outer door guide rail extends into the second annular groove 1031, the bottom of the outer door guide rail contacts the portion of the second buffer ring 1033 located between the two first buffer rings 1032. Assuming that when the external elevator door is closed, one end of the second buffer ring 1033 is located between the two first buffer rings 1032. When the external elevator door is opened, the pulley body 10 rotates circumferentially, causing the second buffer ring 1033 to move from one end to the other. When the external elevator door moves in the direction of closing, the second buffer ring 1033 moves back to its initial position. That is, the part of the second buffer ring 1033 that contacts the outer door guide rail is always moving, thereby avoiding the outer door guide rail from always being in contact with the fixed position of the second buffer ring 1033. This effectively extends the service life of the second buffer ring 1033 and the replacement cycle of the pulley body 10, which has the advantage of a longer service life compared to the prior art.
[0030] Furthermore, in the second embodiment of this application, as Figure 2 As shown, the elevator door roller also includes a fixed rod 20, a sliding sleeve 30, a following member 40, and a clutch structure 50. The fixed rod 20 passes through the bearing 101. The sliding sleeve 30 is slidably disposed on the fixed rod 20 along the axial direction of the fixed rod 20. The following member 40 is connected to the first bone 1023 through the clutch structure 50. When the first bone 1023 rotates circumferentially, the following member 40 rotates circumferentially as well. The following member 40 is threadedly connected to the sliding sleeve 30. One end of the sliding sleeve 30 has a fourth annular groove 301. The end of the second bone 1024 has a first extension end 10242. The first extension end 10242 extends out of the first sliding groove 1026 and into the fourth annular groove 301.
[0031] It should be noted that the sliding sleeve 30 is slidably but non-rotatably mounted on the fixed rod 20. Specifically, as shown in the figure... Figure 2As shown, the sliding sleeve 30 has a protrusion 302, and the fixing rod 20 has a strip groove 201. The protrusion 302 extends into the strip groove 201. When the sliding sleeve 30 moves axially along the fixing rod 20, the protrusion 302 slides along the strip groove 201. Since the sidewall of the protrusion 302 is in contact with the sidewall of the strip groove 201, the sliding sleeve 30 is restricted from circumferential rotation relative to the fixing rod 20. When the external elevator door opens and closes, causing the hanging wheel body 10 to rotate circumferentially, the following rotating member 40 follows the first bone body 1023 to rotate circumferentially. It should be noted that the fixing rod 20 is fixed in a specific position from beginning to end and does not rotate circumferentially. The sliding sleeve 30 is connected to the elevator door via a screw-slider configuration, and the sliding sleeve 30 only moves axially while the sliding sleeve 30 rotates circumferentially. Therefore, when the sliding sleeve 40 rotates circumferentially, the sliding sleeve 30 moves axially along the axis of the fixed rod 20. Furthermore, the sliding sleeve 30 is fixedly connected to the second bone 1024 via the first extension end 10242. Therefore, when the sliding sleeve 30 moves axially, the second bone 1024 moves axially, causing the second buffer ring 1033 to move circumferentially in tandem. This ensures that the portion of the second buffer ring 1033 in contact with the outer door guide rail changes continuously during the opening and closing of the elevator door.
[0032] It should also be noted that after the main body 10 of the hanging wheel rotates a certain number of times, the sliding sleeve 30 moves to the limit position. Since the external elevator door may not have moved to the limit position at this time, in order to avoid the sliding sleeve 30 interfering with the circumferential rotation of the main body 10 of the hanging wheel, the clutch structure 50 is provided between the following rotating member 40 and the first bone 1023. Thus, when the sliding sleeve 30 moves to the limit position, the following rotating member 40 disengages from the first bone 1023. That is, the circumferential rotation of the first bone 1023 at this time will no longer drive the following rotating member 40 to rotate synchronously.
[0033] More specifically, in the second embodiment of this application, to achieve the above structure, as follows: Figure 2 , Figure 3 and Figure 4As shown, the clutch structure 50 includes an armature 501 and an electromagnet 502. The elevator door roller also includes two fixed brackets 60, which are located at both ends of the fixed rod 20 and fixedly connected to the fixed rod 20. The blocking rib 1025 and the first rib 1023 each have a second sliding groove 10521 at the end opposite to the blocking rib 1025. The armature 501 is slidably disposed in the second sliding groove 10521. One end of the armature 501 is disc-shaped, and the other end of the armature 501 has multiple spaced protrusions, and one end of the armature 501 has multiple first limiting grooves 5011 with notches. The following rotating member 40 has a second extension end 401. Both the blocking bone 1025 and the first bone 1023 have a third extension end 10251 at one end of the second sliding groove 10521. The second extension end 401 and the third extension end 10251 both extend into the first limiting groove 5011. The thickness of the third extension end 10251 is greater than the thickness of the second extension end 401. The electromagnet 502 is disposed on the fixing frame 60 and close to the armature 501. When the electromagnet 502 is energized, the armature 501 moves toward the electromagnet 502 and causes the second extension end 401 to disengage from the first limiting groove 5011, while one end of the third extension end 10251 remains in the first limiting groove 5011.
[0034] In addition, in the second embodiment, the clutch structure 50 further includes an elastic reset member (not shown in the figure), one end of which is connected to the armature 501, and the other end of which is connected to the blocking bone 1025 or the first bone 1023.
[0035] Additionally, in the second embodiment, as Figure 2 As shown, the fixed rod 20 is provided with a limit switch 70, and both ends of the sliding sleeve 30 are provided with a limit switch 70. More specifically, the limit switch 70 is provided at both ends of the strip groove 201.
[0036] It should be noted that when the sliding sleeve 30 moves to its limit position, it contacts the corresponding limit switch 70, energizing the corresponding electromagnet 502 and applying a magnetic force to the armature 501. This causes the armature 501 to overcome the elastic force of the elastic reset member and move towards the electromagnet 502, while the second extension end 401 disengages from the first limit groove 5011. At this time, the first bone 1023 rotates circumferentially, driving the armature 501 to rotate circumferentially, but not driving the following member 40 to rotate circumferentially. Consequently, the following member 40 no longer causes the sliding sleeve 30 to move axially. In addition, the elastic reset member is used to make the armature 501 cooperate with the following member 40 again after the electromagnet 502 is de-energized, driving the following member 40 to rotate circumferentially. When the external elevator door moves in the closing direction, the electromagnet 502 is de-energized.
[0037] The schematic molding process of the elevator door roller is used to form the roller body 10 in the first embodiment of this application. Specifically, molten polyurethane plastic is first injected into a mold using an injection molding machine and injection molded into the flexible wear-resistant and noise-reducing part 103. Then, the bearing 101 and the flexible wear-resistant and noise-reducing part 103 are placed in another mold, and the flexible wear-resistant and noise-reducing part 103 is in a state of being about to melt, that is, a softened but not flowing state. Molten nylon plastic is then injected into the mold and injection molded into the roller body 10.
[0038] Specifically, to ensure that the flexible wear-resistant noise-reducing part 103 is in a state of near-melting, when injecting molten nylon plastic into the mold, the mold temperature of the injection molding machine is 80℃~120℃, the drying temperature is 80℃~120℃, the drying time of the desiccant is 4~6 hours, the injection temperature of the nozzle is 270℃~290℃, the temperature of the front injection stage is 270℃~280℃, the temperature of the middle injection stage is 260℃~270℃, and the temperature of the rear injection stage is 240℃~250℃; in addition, when molding the flexible wear-resistant noise-reducing part 103, that is, when injecting polyurethane plastic into the mold, the mold temperature of the injection molding machine is 200℃.
[0039] In summary, the elevator door roller and its molding process described in the embodiments of this application have been clarified, which provides advantages such as longer service life and lower noise for the elevator door roller and its molding process.
[0040] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from these principles.
Claims
1. An elevator door hanger, characterized in that: The elevator door rollers include The roller body includes a bearing, a frame, and a flexible wear-resistant noise reduction component. The frame has a central hole in which the bearing is disposed. The outer side of the frame has a first annular groove, and the flexible wear-resistant noise reduction component is disposed in the first annular groove. The outer side wall of the flexible wear-resistant noise reduction component has a second annular groove. The flexible wear-resistant noise reduction component is made of polyurethane, and the frame is made of nylon.
2. The elevator door roller according to claim 1, characterized in that: The number of the skeleton and the flexible wear-resistant noise reduction component is one. The flexible wear-resistant noise reduction component is injection molded, and the bearing, the skeleton and the flexible wear-resistant noise reduction component are injection molded as a single unit.
3. The elevator door roller according to claim 1, characterized in that: The skeleton includes a first bone, multiple second bones, and a blocking bone. The flexible wear-resistant noise reduction component includes two first buffer rings and second buffer rings. The first bone has multiple first sliding grooves and first annular grooves arranged in a ring array. A second bone is slidably disposed in each of the first sliding grooves. One end of the first sliding groove has an opening. The blocking bone is detachably connected to the first bone and closes the opening. Two first buffer rings are disposed in the first annular groove. The two first buffer rings are arranged opposite each other, and both first buffer rings have second annular grooves. The outer side wall of the second bone has a third annular groove. The second buffer ring is disposed in the third annular groove. When the second bone slides in the first sliding groove, the middle section or end of the second buffer ring is located between the two first buffer rings.
4. The elevator door roller according to claim 3, characterized in that: The elevator door roller also includes a fixed rod, a sliding sleeve, a following rotating member, and a clutch structure. The fixed rod passes through the bearing, and the sliding sleeve is slidably disposed on the fixed rod along the axial direction of the fixed rod. The following rotating member is connected to the first bone body through the clutch structure. When the first bone body rotates circumferentially, the following rotating member follows and rotates circumferentially. The following rotating member is threadedly connected to the sliding sleeve. One end of the sliding sleeve has a fourth annular groove, and the end of the second bone body has a first extension end. The first extension end extends out of the first sliding groove and into the fourth annular groove.
5. The elevator door roller according to claim 4, characterized in that: The clutch structure includes an armature and an electromagnet. The elevator door roller also includes two fixed frames, which are located at both ends of the fixed rod and fixedly connected to the fixed rod. The blocking rib and the first rib each have a second sliding groove at the end opposite to the blocking rib. The armature is slidably disposed in the second sliding groove. The armature has a first limiting groove with a notch. The following member has a second extension end. The blocking rib and the first rib each have a third extension end at the end with the second sliding groove. The second extension end and the third extension end both extend into the first limiting groove. The thickness of the third extension end is greater than the thickness of the second extension end. The electromagnet is disposed on the fixed frame and close to the armature. When the electromagnet is energized, the armature moves toward the electromagnet and causes the second extension end to disengage from the first limiting groove, while one end of the third extension end remains in the first limiting groove.
6. The elevator door roller according to claim 5, characterized in that: The clutch structure also includes an elastic reset member, one end of which is connected to the armature member, and the other end of which is connected to the blocking bone or the first bone.
7. The elevator door roller according to claim 6, characterized in that: The fixed rod is equipped with a limit switch, and both ends of the sliding sleeve are equipped with a limit switch.
8. A molding process for an elevator door roller, used to mold the elevator door roller as described in claim 2, characterized in that: First, molten polyurethane plastic is injected into a mold using an injection molding machine and molded into the flexible wear-resistant and noise-reducing part. Then, the bearing and the flexible wear-resistant and noise-reducing part are placed in another mold, and molten nylon plastic is injected into the mold and molded into the wheel body.
9. The molding process of the elevator door roller according to claim 8, characterized in that: When injecting molten nylon plastic into the mold, the mold temperature of the injection molding machine is 80℃~120℃, the drying temperature is 80℃~120℃, the drying time of the desiccant is 4~6 hours, the injection temperature of the nozzle is 270℃~290℃, the temperature of the front injection section is 270℃~280℃, the temperature of the middle injection section is 260℃~270℃, and the temperature of the rear injection section is 240℃~250℃.