Anti-axial movement pulley device

Abstract

The utility model relates to a kind of pulley device of preventing axial migration, the pulley device includes pulley support, pulley body and pin shaft, pulley support upper portion is equipped with rope baffle;Pulley body both sides are equipped with cover, inside is equipped with bearing and spacer ring;Pin shaft is a stepped shaft with about 10mm diameter difference, it is through pulley support and pulley body, pin shaft head end is fixed on pulley support by stop plate and bolt;Pin shaft head step surface compacts right side bearing inner ring;Pressing plate and pin shaft neck end are fixed by bolt;Transition baffle is compacted left side bearing inner ring under the action of pressing plate;Pin shaft neck end face is equipped with oil cup, inside is equipped with lubricating oil hole, lubricating oil hole one end and the annular gap between bearing in pulley inner hole intercommunication, other end and oil cup intercommunication;Cover inner hole is equipped with oil seal;The utility model structure is simple, maintenance is convenient, can effectively prevent pulley and cover axial migration, with good sealing performance simultaneously, extend the service life of pulley device.

Description

Technical Field

[0001] This utility model relates to a pulley device for preventing axial movement. Background Technology

[0002] Pulley systems, as a common mechanical transmission component, are widely used in lifting, transportation, marine engineering, and other fields. Traditional pulley systems typically consist of a pulley body, bearings, pins, and a pulley support. Their working principle is to change the direction of force on the rope by rotating the pulley body, thereby lifting or moving the object.

[0003] However, existing pulley systems still have some technical problems: First, in existing pulley systems, there are certain gaps between the dust cover and the pulley body, and between the dust cover and the fixing pin, which cannot play an effective sealing role, causing lubricating grease to gradually leak out. At the same time, external environmental factors such as rainwater, steam, and salt spray can easily corrode the bearings, eventually causing the bearings to rust and seize. Second, due to the assembly process requirements, there is often an axial gap of about 2mm between the dust cover and the pulley bracket, and there is no axial fixation, which cannot effectively prevent the axial movement of the pulley and bearings. In addition, when the pulley rotates at high speed, the dust cover will also produce abnormal noise, affecting the normal operation of the equipment.

[0004] These problems seriously affect the working performance and service life of pulley systems, and there is an urgent need for a pulley system with good sealing function and anti-axial movement capability to solve them. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a pulley device to prevent axial movement. This solves the technical problems existing in existing pulley devices, such as poor sealing leading to lubricating grease leakage, external environmental corrosion of bearings, axial clearance causing movement, and abnormal noise during high-speed operation. It achieves the technical effects of reliable sealing, prevention of axial movement, elimination of abnormal noise, and ease of maintenance. This purpose of the utility model is achieved as follows:

[0006] This utility model proposes a pulley device to prevent axial movement, including a pulley bracket, a pulley, and a pin. The pulley body is installed in the middle of the pulley bracket, and a rope-blocking plate is installed on the upper part of the pulley bracket. A pair of bearings are fixed inside the pulley body by two symmetrically arranged covers and a central spacer. The pin is a stepped shaft with a diameter difference of 10mm. An oil cup is provided on the end face of the pin. The pin passes through the pulley bracket and the pulley body. The end face of the pin is fixed to the pulley bracket by a stop plate and bolts. One side of the pin's end diameter is larger than the inner ring diameter of the bearing, and is fixed by the stepped... The stepped surface of the shaft presses against the inner ring of the bearing, and the inner ring of the bearing forms a small interference fit with the thinner part of the pin. A transition retaining ring is fitted on the other side of the pin, and the transition retaining ring is fixed by a pressure plate. The pressure plate is fixed to the journal end of the pin by bolts. Under the action of the pressure plate, the transition retaining ring presses against the inner ring of the bearing in the inner hole of the pulley. The bearings in the inner hole of the pulley are arranged in pairs, and the two bearings form an annular gap between the inner rings under the action of the spacer. The pin has a lubricating oil hole inside, one end of which is connected to the annular gap between the bearings, and the other end is connected to the oil cup. An oil seal is installed in the inner hole of the cover.

[0007] Furthermore, a spacer is installed between the two bearings to allow lubricating grease to enter the bearing raceway through the annular gap between the spacer and the bearing.

[0008] Furthermore, the cover secures the intermediate spacer and a pair of bearings to the pulley body with screws.

[0009] Furthermore, the pin head end face is provided with an oil cup, and the inside is provided with a lubricating oil hole.

[0010] Furthermore, the pin is a stepped shaft with a diameter difference of 10mm. The diameter of the pin head is the same as the inner hole of the pulley bracket, the diameter of the pin journal is the same as the inner hole of the transition retaining ring, and the outer diameter of the transition retaining ring is the same as the inner hole of the pulley bracket.

[0011] Furthermore, the pin and pressure plate, through the transition ring and bearing, restrict the pulley body to the middle of the pulley bracket, preventing it from moving axially.

[0012] Furthermore, a 1-2mm gap is designed between the pin and the pressure plate, a 1-2mm gap is designed between the pressure plate and the pulley bracket, and a 1-2mm gap is designed between the pressure cap and the pulley bracket.

[0013] Furthermore, the inner hole of the sealing cap and the outer ring of the oil seal are fitted with a small interference fit, and the outer circle of the pin and the inner ring of the oil seal are fitted with a small interference fit, which can seal the lubricating grease in the bearing raceway and ensure sufficient lubrication of the bearing.

[0014] Compared with the prior art, the beneficial effects of this utility model are: an oil seal is installed in the gap between the cover and the pin, and the interference fit of the oil seal achieves effective sealing, so that the lubricating grease can be effectively sealed inside the device, while isolating the bearing from external rainwater, steam, salt spray and other corrosive substances, which greatly extends the service life of the pulley device.

[0015] The stepped design at the end of the pin shaft and the clamping effect of the transition retaining ring effectively constrain the axial displacement of the bearing, prevent the axial movement of the pulley body and the bearing, and improve the smoothness and quietness of the pulley device operation.

[0016] In the pulley device structure, a spacer ring is used instead of the snap ring in the traditional design at the two bearings adjacent to each other. This avoids the snap ring from hindering the disassembly and replacement of the bearing, and makes it very convenient to replace the bearing after it has reached the end of its service life. Attached Figure Description

[0017] Figure 1 This is a front structural diagram of a pulley device for preventing axial movement;

[0018] Figure 2 yes Figure 1 A schematic diagram of the cross-sectional structure cut along line AA.

[0019] Figure 3 This is a schematic diagram of the back structure of a pulley device for preventing axial movement;

[0020] In the diagram: 1. Pulley bracket, 2. Pulley body, 3. Rope stop plate, 4. Stop plate, 5. Cover, 7. Oil seal, 8. Bolt, 10. Oil cup, 11. Bearing, 12. Spacer ring, 13. Transition retaining ring, 14. Pressure plate, 15. Pin, 16. Shaft head, 17. Journal. Detailed Implementation

[0021] To enhance understanding of this utility model, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. These embodiments are only used to explain the present utility model and do not constitute a limitation on the scope of protection of the present utility model.

[0022] Example 1

[0023] Please refer to Figure 1-3This utility model provides an anti-axial movement pulley device, including a pulley bracket 1 and a pin 15. A pulley body 2 is mounted in the middle of the pulley bracket 1, and a rope-blocking plate 3 is mounted on the upper part of the pulley bracket 1. Covers 5 are mounted on both ends of the pulley body 2. A pair of bearings 11 are installed inside the pulley body 2 and between the two cover 5, with a spacer 12 between the two bearings 11. The pin 15 is a stepped shaft that passes through the bearings 11 inside the pulley bracket 1 and the pulley body 2. The shaft end 16 of the pin 15 is fixed to the pulley bracket 1 by a stop plate 4. On the upper part, a pressure plate 14 is installed on the end face of the journal 17 of the pin 15. The pressure plate 14 is fixed to the pin 15 by bolts 8. The transition retaining ring 13 is fitted on the journal of the pin 15. The pair of bearings 11 are restricted in the middle of the pulley bracket 1 by the stepped surface of the pin 15 and the transition retaining ring 13. Under the action of the spacer 12, the two bearings 11 form an annular gap between the inner rings of the bearings 11. The end face of the pin 15 is provided with an oil cup, which has a lubricating oil hole inside. One end of the lubricating oil hole is connected to the annular gap between the two bearings 11, and the other end is connected to the oil cup 10. An oil seal is installed in the inner hole of the cover 5.

[0024] It should be noted that the pulley bracket 1 is made of metal, possessing sufficient strength and rigidity to withstand various loads during the use of the pulley device. The pulley bracket 1 has a U-shaped structure, with through holes on both side walls for mounting the pin 15. A rope-blocking plate 3 is mounted on the upper part of the pulley bracket 1. The rope-blocking plate 3 is made of the same metal as the pulley bracket 1 and is fixed to the upper part of the pulley bracket 1 by welding or bolts 8. The function of the rope-blocking plate 3 is to prevent the rope from slipping out of the pulley groove during pulley operation, ensuring the normal operation of the pulley device. The pulley body 2 is installed between the two side walls of the pulley bracket 1. The outer circumference of the pulley body 2 has grooves for accommodating the rope, and a through hole is opened in the center of the pulley body 2 for mounting the bearing 11 and spacer 12. The pulley body 2 is made of high-strength metal, possessing good wear resistance and impact resistance, and can withstand long-term use without significant wear. The pin 15 passes through the bearing 11 inside the pulley bracket 1 and the pulley body 2, providing rotational support for the pulley body 2. The pin 15 is made of high-strength alloy steel and has high hardness, strength and wear resistance after heat treatment. The end face of the pin 15 is provided with an oil cup 10, and the inside of the pin 15 is provided with a lubricating oil hole. One end of the lubricating oil hole is connected to the annular gap between the bearing and the other end is connected to the oil cup 10. The inside of the lubricating oil hole is filled with lubricating grease to provide continuous lubrication for the bearing 11.

[0025] Understandably, the pulley body 2 uses two symmetrically arranged covers 5 and a middle spacer 12 to fix a pair of bearings 11 inside the pulley body.

[0026] Understandably, pin 15 is a stepped shaft, and the shaft end 16 of pin 15 is fixed to pulley bracket 1 by a stop plate 4. The stop plate 4 is made of the same material as pulley bracket 1 and is fixedly connected to pulley bracket 1 by bolts 8. The function of the stop plate 4 is to prevent pin 15 from moving axially during use and to ensure the stability of the pulley device.

[0027] Understandably, the pressure plate 14 is fixed to the journal end 17 of the pin 15 by bolts. The pressure plate 14 is made of the same material as the pulley bracket 1. The transition retaining ring 13 is fitted onto the journal of the pin 15. The transition retaining ring 13 is made of high-strength alloy material. Its inner diameter matches the diameter of the journal 17 of the pin 15, and its outer diameter matches the diameter of the through hole on the pulley bracket 1, ensuring that the pin 15 can be stably installed on the pulley bracket 1.

[0028] Understandably, the diameter of the shaft end 16 of the pin 15 is larger than the diameter of the journal 17. The difference between the diameter of the shaft end 16 and the diameter of the journal 17 is 10mm. This design can prevent the bearing 11 inside the inner hole of the pulley body 2 from moving to the right.

[0029] Understandably, a bearing 11 is mounted on the journal 17 of the pin 15. The bearing 11 is a standard rolling bearing with good load-bearing capacity and rotational performance. The inner ring of the bearing 11 is tightly fitted with the journal 17 of the pin 15, and the outer ring is tightly fitted with the inner hole of the pulley body 2, ensuring that the pulley body 2 can rotate smoothly on the pin 15.

[0030] Understandably, a pressure plate 14 is installed on one side of the transition retaining ring 13. The pressure plate 14 is made of the same material as the transition retaining ring 13 and is fixedly connected to the journal 17 of the pin 15 by bolts 8. Under the action of the pressure plate 14, the transition retaining ring 13 presses against the inner ring of the left bearing 11 inside the pulley's inner hole, preventing the bearing 11 inside the pulley body 2 from moving to the left.

[0031] Understandably, the bearings 11 inside the inner hole of the pulley body 2 are arranged in pairs. Under the action of the spacer 12, the two bearings 11 form an annular gap between the inner rings. The pin 15 is provided with a lubricating oil hole. One end of the lubricating oil hole is connected to the annular gap between the bearings, and the other end is connected to the oil cup. This design allows the lubricating grease to enter the bearing raceway through the oil cup 10 and the lubricating oil hole inside the pin 15 to provide necessary lubrication for the bearing.

[0032] Understandably, the bearing 11 has retaining covers 5 on both sides. These covers 5 are made of ordinary steel and are installed on the pulley body 2 using bolts 8. The retaining covers 5 ensure that the outer ring of the bearing 11 does not move relative to the pulley body 2. An oil seal 7 is installed inside the inner hole of the retaining cover 5. The oil seal 7 is made of wear-resistant rubber, providing excellent sealing performance and wear resistance. The inner diameter of the oil seal 7 fits tightly with the outer diameter of the pin 15 and the outer diameter of the transition retaining ring 13, forming an effective sealing structure. This prevents lubricating grease from leaking out, ensuring sufficient lubrication of the bearing 11, and preventing external dust and impurities from entering the bearing 11, thus extending its service life.

[0033] Understandably, a 1-2mm gap is provided between the pin 15 and the pressure plate 14, and a 1-2mm gap is provided between the pressure plate 14 and the pulley bracket 1. These gaps are designed to provide a certain adjustment space during the installation and use of the pulley device, to ensure the axial pressing of the bearing 11 in the inner hole of the pulley body 2, and to prevent friction and abnormal noise between the rotating and fixed parts.

[0034] The working principle of the pulley device in this embodiment is as follows: the oil enters the bearing raceway through the lubrication hole inside the pin 15 via the oil cup 10 and is sealed to provide necessary lubrication to the bearing. The cover 5 and oil seal 7 prevent lubricating oil leakage and the entry of external impurities, keeping the bearing 11 clean and well lubricated. When the rope passes through the groove of the pulley body 2, the pulley body 2 rotates around the pin 15 under the support of the bearing 11. The shaft head 16 of the pin 15 is fixed to the pulley bracket 1 by the stop plate 4. The pressure plate 14 is fixed to the pin 15 by bolts. The pressure plate 14, through the transition retaining ring 13 and the bearing 11, restricts the pulley body in the middle of the pulley bracket and prevents it from moving axially under the combined action of the shaft head of the pin 15. The rope guard plate 3 prevents the rope from leaving the pulley groove and ensures the normal operation of the pulley device.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A pulley device for preventing axial movement, characterized in that, The device includes a pulley bracket, a pulley, and a pin. The pulley body is mounted in the middle of the pulley bracket, and a rope-blocking plate is mounted on the upper part of the pulley bracket. A pair of bearings are fixed inside the pulley body by two symmetrically arranged covers and a central spacer. The pin passes through both the pulley bracket and the pulley body. The pin is a stepped shaft with a diameter difference of 10mm. The end of the pin is fixed to the pulley bracket by a stop plate and bolts. One side of the pin's end has a diameter larger than the bearing inner ring diameter, and the stepped surface of the pin presses against the bearing inner ring. The bearing inner ring and the pin... The thinner part of the shaft forms an interference fit. A transition retaining ring is fitted on the other side of the pin. The transition retaining ring is fixed by a pressure plate. The pressure plate is fixed to the journal end of the pin by bolts. Under the action of the pressure plate, the transition retaining ring presses against the inner ring of the bearing in the inner hole of the pulley. The bearings in the inner hole of the pulley are arranged in pairs. Under the action of the spacer, the two bearings form an annular gap between the inner rings. An oil cup is provided on the end face of the pin shaft. A lubricating oil hole is provided inside the pin. One end of the lubricating oil hole is connected to the annular gap between the bearings, and the other end is connected to the oil cup. An oil seal is installed in the inner hole of the cover.

2. The pulley device for preventing axial movement according to claim 1, characterized in that, A spacer is installed between the two bearings to allow lubricating grease to enter the bearing raceway through the annular gap between the spacer and the bearing.

3. The pulley device for preventing axial movement according to claim 1, characterized in that, The cover is fixed to the pulley body by screws, with the intermediate spacer and a pair of bearings in place.

4. The pulley device for preventing axial movement according to claim 1, characterized in that, The pin is a stepped shaft with a diameter difference of 10mm, and the diameter of the pin head is the same as the inner hole of the pulley bracket.

5. The pulley device for preventing axial movement according to claim 1, characterized in that, The pin and pressure plate, through the combined action of the transition ring and bearing, restrict the pulley body to the middle of the pulley bracket, preventing axial movement.

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