Driving wheel for multi-fulcrum overhang crane and preparation method of driving wheel

Abstract

The invention belongs to the technical field of cranes, and discloses a driving wheel for a multi-fulcrum overhang crane and a preparation method of the driving wheel. Two layers of polyurethane composite coatings and the circumferential surface of a hub of the driving wheel are bonded together by adopting a polyurethane rubber coating process on the circumferential surface of the hub; the hardness of the two polyurethane composite coatings is different by adjusting the proportion of polyurethane materials. The problems of strength, hardness, wear resistance, aging resistance and the like of an existing driving wheel are solved, and the service life of the driving wheel is effectively prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of crane drive wheels in aviation manufacturing, and specifically relates to a drive wheel for a multi-point suspension crane and a preparation method thereof. Background Art

[0002] The installation method of a multi-point suspension crane is to suspend the crane on multiple parallel H-steel rails on the lower chord of the grid through the suspension wheel, and rely on the trolley motor to drive the driving wheel to rotate, so that friction is generated between the circumferential surface of the driving wheel pressed against the lower plane of the H-steel rail and the lower plane of the H-steel rail, and the crane trolley is driven to reciprocate horizontally on the rail through friction. Therefore, as a key component of the crane trolley operation, the driving wheel must have high strength, hardness, wear resistance and aging resistance. The existing crane trolley driving wheel is difficult to meet the above requirements at the same time under actual working conditions, and a new driving wheel structure needs to be designed. Summary of the invention

[0003] The present invention aims to solve the problems of strength, hardness, wear resistance and aging resistance of the driving wheel of a multi-support crane, and proposes a driving wheel for a multi-support crane and a preparation method thereof. The strength, toughness, wear resistance and aging resistance of the coating on the circumferential surface of the driving wheel are significantly improved, thereby effectively extending the service life of the driving wheel.

[0004] In order to achieve the above invention objectives, the technical solutions adopted in this application are as follows:

[0005] A driving wheel for a multi-support point suspension crane comprises a hub, and two layers of polyurethane composite coatings with different hardness are coated on the circumferential surface of the hub.

[0006] As a further solution of the present invention: the first layer of polyurethane composite coating is in direct contact with the wheel hub, and the second layer of polyurethane composite coating is coated on the outer surface of the first layer of polyurethane composite coating, and the hardness of the first layer of polyurethane composite coating is greater than the hardness of the second layer of polyurethane composite coating.

[0007] As a further solution of the present invention: the thickness of the second layer of polyurethane composite coating is greater than the thickness of the first layer of polyurethane composite coating.

[0008] As a further solution of the present invention: a plurality of grooves are provided on the circumferential surface of the hub, so that the first layer of polyurethane composite coating forms a plurality of positioning protrusions matched with the grooves.

[0009] As a further solution of the present invention: the length direction of the groove is parallel to the axial direction of the hub, and the grooves are evenly distributed along the circumferential surface of the hub.

[0010] As a further solution of the present invention: the circumferential surface of the hub is roughened, or anilox grooves are machined on the circumferential surface of the hub.

[0011] A method for preparing a driving wheel for a multi-point suspension crane comprises the following steps:

[0012] Prepare the drive wheel hub and perform surface treatment on it;

[0013] Prepare a polyurethane composite material, and coat the polyurethane composite material on the circumferential surface of the wheel hub after the above treatment by using a coating process, and form a first layer of polyurethane composite coating after vulcanization;

[0014] Surface treatment of the first polyurethane composite coating;

[0015] The ratio of the polyurethane composite material is adjusted, and the outer surface of the first layer of polyurethane composite coating is coated with it by using a coating process, and a second layer of polyurethane composite coating is formed after vulcanization.

[0016] As a further solution of the present invention: the hub surface treatment includes cleaning, roughening, sandblasting, and grooving.

[0017] As a further solution of the present invention: the surface treatment of the first layer of polyurethane composite coating includes cleaning, grinding and roughening.

[0018] Compared with the prior art, the beneficial effects of this application are:

[0019] 1. This application uses a double-layer polyurethane encapsulation process to optimize the design of the coating on the circumferential surface of the driving wheel, which significantly improves the strength, toughness, wear resistance and aging resistance of the coating on the circumferential surface of the driving wheel, thereby effectively extending the service life of the driving wheel.

[0020] 2. The present application adjusts the ratio of polyurethane materials to make the hardness of the two layers of polyurethane composite coating different. The hardness of the inner layer of polyurethane material is higher (Shore hardness value 90-95), which improves the overall deformation resistance of the driving wheel; the hardness of the outer layer of polyurethane material is lower (Shore hardness value 80-85), so that the driving wheel can have better contact with the track, effectively avoiding slipping when the driving wheel rotates.

[0021] 3. The thickness of the second layer of polyurethane composite coating of the present application is increased by 3-5 mm on the basis of the theoretical size value, so that the driving wheel has more polyurethane layers to cope with the wear caused by friction and extend the service life of the driving wheel.

[0022] 4. The present application processes mesh stripes on the circumferential surface of the driving wheel hub and grooves along the axial direction. The mesh stripes can increase the contact area between the first layer of polyurethane composite coating and the circumferential surface of the hub, and the grooves can enhance the integrity between the first layer of polyurethane composite coating and the circumferential surface of the hub.

[0023] 5. In the present application, the normal support force of the groove sidewall on the first layer of polyurethane composite coating reduces the friction between the first layer of polyurethane composite coating and the circumferential surface of the hub, thereby avoiding the phenomenon of debonding between the circumferential surface of the driving wheel hub and the first layer of polyurethane composite coating.

[0024] The present application is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0026] In the attached picture:

[0027] Figure 1 This is a schematic diagram of the driving wheel structure of the multi-point suspension crane of this application.

[0028] Explanation of reference numerals in the figures: 1 wheel hub, 2 first layer of polyurethane composite coating, 3 second layer of polyurethane composite coating, 4 groove. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] In a first aspect, the present invention discloses a driving wheel for a multi-point suspension crane, which includes a hub 1, and two layers of polyurethane composite coatings with different hardness are coated on the circumferential surface of the hub 1. The circumferential surface of the driving wheel hub 1 is bonded together with the two layers of polyurethane composite coatings by a polyurethane encapsulation process, thereby obtaining physical properties that meet the requirements of the crane driving wheel.

[0031] Furthermore, the first layer of polyurethane composite coating 2 is in direct contact with the wheel hub 1, and the second layer of polyurethane composite coating 3 is coated on the outer surface of the first layer of polyurethane composite coating 2, and the hardness of the first layer of polyurethane composite coating 2 is greater than the hardness of the second layer of polyurethane composite coating 3. By adjusting the polyurethane material ratio, the hardness of the two layers of polyurethane composite coating is different, the first layer of polyurethane composite coating 2 has a higher hardness (Shore hardness value 90-95), which improves the overall anti-deformation ability of the driving wheel; the second layer of polyurethane composite coating 3 has a lower hardness (Shore hardness value 80-85), so that the driving wheel can have better contact with the track, effectively avoiding slipping when the driving wheel rotates.

[0032] Furthermore, the thickness of the second polyurethane composite coating 3 is greater than the thickness of the first polyurethane composite coating 2. The second polyurethane composite coating 3 is 3-5 mm thicker than the first polyurethane composite coating 2, so that the driving wheel has more polyurethane layers to cope with the wear caused by friction, thereby extending the service life of the driving wheel. The driving wheel group of the crane can make the outer circle of the driving wheel fit better with the track by adjusting the length of the wheel group spring, that is, adjusting the tension of the spring.

[0033] Furthermore, a plurality of grooves 4 are provided on the circumferential surface of the wheel hub 1, so that the first layer of polyurethane composite coating 2 forms a plurality of positioning protrusions adapted to the grooves 4. The length direction of the grooves 4 is parallel to the axial direction of the wheel hub 1, and the grooves 4 are evenly distributed along the circumferential surface of the wheel hub 1. The grooves 4 are designed as non-curved surfaces or circular surfaces, and the positioning protrusions are embedded in the grooves 4, which can enhance the integrity between the first layer of polyurethane composite coating 2 and the circumferential surface of the wheel hub 1. The sidewalls of the grooves 4 play a normal supporting role for the first layer of polyurethane composite coating 2, and the friction force generated between the first layer of polyurethane composite coating 2 and the circumferential surface of the wheel hub 1 will be reduced, thereby avoiding the phenomenon of debonding between the circumferential surface of the wheel hub 1 and the first layer of polyurethane composite coating 2.

[0034] Furthermore, the circumferential surface of the hub 1 is roughened, or a reticulated groove is machined on the circumferential surface of the hub 1. This can increase the contact area between the first layer of polyurethane composite coating 2 and the circumferential surface of the hub 1, and avoid the phenomenon of debonding.

[0035] In a second aspect, the present invention provides a method for preparing a driving wheel for a multi-point suspension crane, comprising the following steps:

[0036] Step 1: Prepare the drive wheel hub 1 and perform surface treatment on it; the surface treatment of the hub 1 includes cleaning, roughening, sandblasting, and grooving. Cleaning, roughening, and sandblasting are to clean the drive wheel hub 1 and roughen the circumferential surface, increase the contact area between the polyurethane composite coating and the circumferential surface of the hub 1, make it more firmly bonded, and prevent degumming. Vulcanization can enhance the aging resistance and deformation resistance of the polyurethane composite coating, thereby obtaining physical properties that meet the requirements of the crane drive wheel.

[0037] A reticulated groove is processed on the circumferential surface of the driving wheel hub 1 and a groove 4 is opened along the axial direction. The reticulated groove can increase the contact area between the first layer of polyurethane composite coating 2 and the circumferential surface of the hub 1. The opened groove 4 can enhance the integrity between the first layer of polyurethane composite coating 2 and the circumferential surface of the hub 1. At the same time, the normal support force of the groove side wall on the first layer of polyurethane composite coating 2 reduces the friction between the first layer of polyurethane composite coating 2 and the circumferential surface of the hub 1, thereby avoiding the phenomenon of debonding between the circumferential surface of the driving wheel hub 1 and the first layer of polyurethane composite coating 2.

[0038] Step 2: prepare a polyurethane composite material, and use a coating process to coat the polyurethane composite material on the circumferential surface of the wheel hub 1 after the above treatment, and form a first layer of polyurethane composite coating 2 after vulcanization.

[0039] Step 3: performing surface treatment on the first layer of polyurethane composite coating 2; the surface treatment of the first layer of polyurethane composite coating 2 includes cleaning, grinding and roughening.

[0040] Step 4: Adjust the ratio of the polyurethane composite material, and coat it on the outer surface of the first layer of polyurethane composite coating 2 by using a coating process, and form a second layer of polyurethane composite coating 3 after vulcanization.

[0041] The two layers of polyurethane composite coatings with different hardness are cast in two times. After the first layer of polyurethane composite coating 2 is cast, its surface is cleaned, polished and roughened to increase the bonding area between the polyurethane composite coatings so that the first and second polyurethane composite coatings 2 and 3 are bonded more firmly.

[0042] See attached Figure 1 The driving wheel structure for a multi-point suspension crane of the present application comprises a hub 1, a first layer of polyurethane composite coating 2 and a second layer of polyurethane composite coating 3 covering the circumferential surface of the hub 1, and a groove 4 opened on the circumferential surface of the hub 1.

[0043] In the embodiment, polyurethane material is used as the coating on the circumferential surface of the driving wheel hub 1, and the polyurethane encapsulation process is used to bond the polyurethane material to the hub 1; by adjusting the polyurethane material ratio, the coating on the circumferential surface of the hub 1 is divided into two layers of polyurethane composite coatings with different hardnesses, which are cast separately. The first layer of polyurethane composite coating 2 has a higher hardness (Shore hardness value 90-95), which improves the overall anti-deformation ability of the driving wheel; the second layer of polyurethane composite coating 3 has a lower hardness (Shore hardness value 80-85), so that the driving wheel can have better contact with the track and avoid slipping when the driving wheel is running. The thickness of the second layer of polyurethane composite coating 3 is increased by 3-5mm on the basis of the theoretical size value, so that the driving wheel has more polyurethane layers to cope with the wear caused by friction and extend the service life of the driving wheel. By machining an anilox groove on the circumferential surface of the wheel hub 1 and machining a certain number of grooves 4 along the axial direction, the anilox groove can increase the contact area between the first layer of polyurethane composite coating 2 and the circumferential surface of the wheel hub 1, and the groove 4 can enhance the integrity between the first layer of polyurethane composite coating 2 and the circumferential surface of the wheel hub 1. The normal support force of the side wall of the groove 4 on the first layer of polyurethane composite coating 2 reduces the friction between the first layer of polyurethane composite coating 2 and the circumferential surface of the wheel hub 1, thereby avoiding the phenomenon of debonding between the drive wheel hub 1 and the first layer of polyurethane composite coating 2.

[0044] So far, the purpose of the present invention has been achieved.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A driving wheel for a multi-point suspension crane, comprising a hub, characterized in that: The circumferential surface of the hub is coated with two layers of polyurethane composite coatings with different hardnesses.

2. The driving wheel for a multi-point suspension crane according to claim 1, characterized in that: The first layer of polyurethane composite coating is in direct contact with the wheel hub, and the second layer of polyurethane composite coating is coated on the outer surface of the first layer of polyurethane composite coating. The hardness of the first layer of polyurethane composite coating is greater than that of the second layer of polyurethane composite coating.

3. The driving wheel for a multi-point suspension crane according to claim 2, characterized in that: The thickness of the second polyurethane composite coating layer is greater than the thickness of the first polyurethane composite coating layer.

4. The driving wheel for a multi-point suspension crane according to claim 3, characterized in that: A plurality of grooves are provided on the circumferential surface of the hub, so that the first layer of polyurethane composite coating forms a plurality of positioning protrusions matched with the grooves.

5. The driving wheel for a multi-point suspension crane according to claim 4, characterized in that: The length direction of the groove is parallel to the axial direction of the hub, and the grooves are evenly distributed along the circumferential surface of the hub.

6. A driving wheel for a multi-point suspension crane according to any one of claims 1 to 5, characterized in that: The hub circumferential surface is roughened, or anilox grooves are machined on the hub circumferential surface.

7. A method for preparing a driving wheel for a multi-point suspension crane, characterized in that: The steps include: Prepare the drive wheel hub and perform surface treatment on it; Prepare a polyurethane composite material, and coat the polyurethane composite material on the circumferential surface of the wheel hub after the above treatment by using a coating process, and form a first layer of polyurethane composite coating after vulcanization; Surface treatment of the first polyurethane composite coating; The ratio of the polyurethane composite material is adjusted, and the outer surface of the first layer of polyurethane composite coating is coated with it by using a coating process, and a second layer of polyurethane composite coating is formed after vulcanization.

8. The method for preparing a driving wheel for a multi-point suspension crane according to claim 7, characterized in that: The hub surface treatment includes cleaning, roughening, sandblasting, and grooving.

9. The method for preparing a driving wheel for a multi-point suspension crane according to claim 7, characterized in that: The surface treatment of the first layer of polyurethane composite coating includes cleaning, grinding and roughening.

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