A method for preventing circumferential rotation of a load wheel protective cover in a rubber wheel and steel wheel double-track subway

Abstract

The application discloses a kind of rubber wheel steel wheel double-track subway load bearing wheel protective cover prevents circumferential rotation method, it prevents the circumferential rotation of protective cover by increasing the friction resistance between the rim groove part of rim and protective cover.This application can effectively prevent the circumferential rotation of protective cover in high-frequency vibration working environment, thereby avoiding the protective cover from falling off due to the circumferential rotation of protective cover.

Description

Technical Field

[0001] This invention relates to a method for preventing circumferential rotation of a protective cover, and more particularly to a method for preventing circumferential rotation of a protective cover for a load-bearing wheel in a rubber-tired and steel-wheeled double-track subway. Background Technology

[0002] With the rapid development of my country's economy and the continuous improvement of its comprehensive national strength in recent years, the urban rail transit industry has also been booming. Although some emerging rail transit systems such as trams, maglev trains, and monorails have risen rapidly in recent years, and urban rail transit systems are becoming more diversified and coordinated in multiple systems, subways remain the most important mode of transportation to alleviate passenger flow pressure in cities, especially large and medium-sized cities.

[0003] my country's mature subway vehicles are mainly steel-wheeled and steel-railed. However, as major cities have increasingly higher standards and requirements for the ecological environment in the development of rail transit, rubber-wheeled vehicles have begun to receive widespread attention.

[0004] Rubber-tired and steel-wheeled dual-rail vehicles have a long history of use abroad and are widely used. Rubber-tired and steel-wheeled dual-rail subway vehicles are based on traditional steel-wheeled and steel-rail vehicles, with the addition of a rubber-tired running gear and a rubber-tired guiding system. For example... Figure 1 As shown, a load-bearing wheel 2 is coaxially mounted on the outer side of the steel wheel 1. A guide wheel 3 is horizontally positioned in front of the steel wheel 1 and the load-bearing wheel 2. The load-bearing wheel 2 and the guide wheel 3 are rubber tires. A steel rail 4 is positioned below the steel wheel 1, a rubber tire track 5 is positioned below the load-bearing wheel 2, and a guide track 6 is positioned on one side of the guide wheel 3. This type of vehicle has two sets of running gear: a steel wheel and steel rail system and a rubber tire running system. Under normal operating conditions, the vehicle is driven forward by the rubber tire running system, with the rubber tires running on two flat tracks. At this time, the steel wheel is suspended in the air, and there is a certain gap between the steel wheel and the steel rail. Once the rubber tire leaks air or a tire bursts, the vehicle body quickly sinks. At this time, the steel wheel comes into contact with the steel rail, and the wheel flanges on both sides are tightly locked between the two steel rails. The vehicle is then supported by the safety spare steel wheel and decelerates along the steel rail, providing a safety protection function.

[0005] like Figure 2 As shown, a rim 7 is installed at both ends of each axle 8 of the axle, and a tire 9 is installed on each rim 7. A circular protective cover 10 is installed on the outer end face of each rim 7. The protective cover 10 covers the end of the axle 8 and the outer end face of the rim 7. The subway power supply line 11 is also installed near the end of the axle. The protective cover is made of ABS plastic and its function is to prevent electric arc and dust.

[0006] The connection structure between the protective cover 10 and the rim 7 is as follows: Figure 3As shown, the side of the installed protective cover 10 facing the rim 7 is the inner part B of the protective cover 10, and the side of the installed protective cover 10 facing the power supply line 11 is the outer part C of the protective cover 10. Multiple retaining springs 12 are provided on the inner part B of the protective cover 10 along its circumference. One end of each retaining spring 12 is connected to the inner part of the protective cover 10 by a bolt 13 and a nut 14. A spring hook 121 is bent at the other end of each retaining spring 12. A protruding rim groove 711 is provided at the outer end of the rim 7. 11 is provided with a full circle. When the tire 9 is installed, it is pressed tightly against the outer side of the rim groove 711. The spring hooks 121 of multiple retaining springs 12 engage and hook together with the inner side of the rim groove 711. Since the retaining springs 12 are elastic, they form an interference fit with the rim groove 711 when hooked. Since both the retaining springs 12 and the rim groove 711 are made of metal, friction is also generated between them when hooked. Through the above-mentioned forces, the protective cover 10 can be connected to the outer end face of the rim 7 by using multiple retaining springs 12.

[0007] like Figure 3 As shown, in the prior art, the retaining spring 12 is connected to the protective cover 10 by a bolt 13, which passes through the protective cover 10 and the retaining spring 12 and is inserted into the protective cover 10 towards the inner side B of the protective cover 10 and locked with the nut 14. When the protective cover 10 is installed, only the nut 131 of the bolt 13 is located on the outer side of the protective cover 10, while the bolt stub 132 and the nut 14 are located on the inner side of the protective cover 10. Since the risk of arcing between the nut 131 and the power supply line 11 only exists on the outer side of the protective cover 10, the nut 131 of the bolt 13 is the only one at risk of arcing with the power supply line 11. Therefore, in the prior art, the material of the nut 131 is changed to a non-conductive material to avoid the risk of arcing.

[0008] In practice, the applicant found that the problem was that the protective cover would often rotate circumferentially after the vehicle had been running for a period of time, causing it to fall off.

[0009] A search revealed no patent documents that are identical or similar to this application.

[0010] In summary, this paper explores a method for designing a protective cover for the load-bearing wheels in a rubber-tired and steel-wheeled double-track subway to prevent circumferential rotation of the protective cover after the vehicle has been running for a period of time, thereby preventing the protective cover from falling off. Summary of the Invention

[0011] The technical problem solved by the present application is to provide a method for preventing circumferential rotation of a protective cover of a load wheel in a rubber wheel and steel wheel double-track subway, which can avoid circumferential rotation of the protective cover in daily work and prevent the problem of falling off of the protective cover.

[0012] To solve the above technical problem, the technical solution adopted by the present application is a method for preventing circumferential rotation of a protective cover of a load wheel in a rubber wheel and steel wheel double-track subway, which prevents circumferential rotation of the protective cover by increasing the frictional resistance between the rim groove part of the rim and the protective cover.

[0013] Preferably, a plurality of pins are arranged on the inner side of the protective cover along the circumferential direction of the protective cover, and each pin can extend radially along the protective cover;

[0014] When the protective cover is hooked and connected to the outer side end surface of the rim through the plurality of spring clips on the inner side of the protective cover and the rim groove part of the rim, the plurality of pins are then extended radially along the protective cover and inserted into the rim groove part of the rim to form a second contact part H2 in contact with the rim groove part, and the second contact part H2 generates frictional resistance to prevent circumferential rotation of the protective cover.

[0015] Preferably, the plurality of spring clips and the plurality of pins are arranged in an interlaced manner.

[0016] Preferably, an inclined surface of the pin is arranged on one end of the pin, and an inclined surface of the groove is arranged on the inner side of the rim groove part of the rim and matches the inclined surface of the pin; when one end of the pin is inserted into the rim groove part of the rim to form the second contact part H2 in contact with the rim groove part, the second contact part H2 is formed by the inclined surface of the pin being in contact with the inclined surface of the groove.

[0017] Preferably, the plurality of pins are arranged on the inner side of the protective cover through a detachable connection structure; the pins are not installed before the protective cover is installed, and after the protective cover is hooked and connected to the outer side end surface of the rim through the plurality of spring clips on the inner side of the protective cover and the rim groove part of the rim, the pins are installed on the protective cover so that one end of the pin is inserted into the rim groove part of the rim to form the second contact part H2 in contact with the rim groove part.

[0018] Preferably, the detachable connection structure comprises a plurality of pin mounting seats arranged on the inner side of the protective cover along the circumferential direction of the protective cover; a pin through groove is formed in the pin mounting seat along the radial direction of the protective cover, one end of the pin through groove is an inner slot opening located in the inner space of the protective cover, the other end of the pin through groove is an outer slot opening located in the outer space of the protective cover, and a threaded hole and a through hole are arranged on the opposite sides of the pin through groove along the direction parallel to the central axis of the protective cover.

[0019] When the protective cover is hooked on the outer side end surface of the rim through the plurality of snap springs of the inner side portion of the protective cover and the rim groove portion of the rim, the latch is inserted into the latch through slot from the outer space of the protective cover through the outer slot of the latch through slot, so that one end of the latch extends into the rim groove portion of the rim through the inner slot of the latch through slot and contacts the rim groove portion, and finally the latch screw is screwed into the threaded hole through the through hole and the latch, thereby locking the latch on the latch mounting seat.

[0020] Preferably, the latch screw is made of an insulating non-metallic material.

[0021] Preferably, a plurality of springs are further arranged on the inner side portion of the protective cover along the circumferential direction of the protective cover, and the length direction of the spring is arranged along the direction parallel to the central axis of the protective cover.

[0022] When the protective cover is installed, the side surface of the spring contacts the end portion of the rim groove portion of the rim to form a contact portion three H3.

[0023] Preferably, the end portion of the rim groove portion at the contact portion three H3 is designed as a plane matched with the side surface of the spring, and the side surface of the spring contacts the plane of the end portion of the rim groove portion to form the contact portion three H3.

[0024] Preferably, the spring is made of plastic material.

[0025] The beneficial effects of the present application are that: the present application not only generates friction resistance through the contact part D between the snap spring leaf and the rim groove part when preventing the protective cover from rotating circumferentially, but also generates friction resistance through the contact part H2 between the bolt and the rim groove part, thereby better preventing the protective cover from rotating circumferentially. In fact, the present application increases the friction resistance between the rim groove part of the rim and the protective cover when the protective cover tends to rotate circumferentially in the actual working environment, thereby effectively preventing the protective cover from rotating circumferentially in a high-frequency vibration working environment, and avoiding the protective cover from falling off due to the circumferential rotation of the protective cover. The contact part H2 is designed as a bevel contact, thereby further increasing the friction resistance generated by the contact part H2, and better preventing the protective cover from rotating circumferentially. The multiple snap spring leaves and multiple bolts are staggered and arranged, thereby further increasing the friction resistance between the rim groove part and the protective cover to prevent the protective cover from rotating circumferentially. The dismounting structure between the bolt and the protective cover is designed, so that the present application can initially install the protective cover on the outer side end of the rim through the snap spring leaf, and then insert the bolt into contact with the rim groove part of the rim, thereby realizing the function of increasing the friction resistance through the cooperation between the bolt and the rim groove part, and facilitating the installation and dismounting of the bolt. The end part of the spring leaf is in contact with the rim groove part of the rim to form a contact part three, thereby further increasing the friction resistance and preventing the protective cover from rotating circumferentially. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic view of the running structure of the existing rubber wheel and steel wheel double-track subway vehicle;

[0027] Figure 2 is a schematic view of the axial cross-sectional structure of the wheel set of the existing rubber wheel and steel wheel double-track subway vehicle;

[0028] Figure 3 is a schematic view of the axial cross-sectional structure of the wheel set of the existing rubber wheel and steel wheel double-track subway vehicle; Figure 2 is an enlarged structural schematic view of part A in the middle;

[0029] Figure 4 is a schematic view of the front structure of the protective cover in the embodiment of the present application (viewed from the inside of the protective cover);

[0030] Figure 5 is a schematic view of the front structure of the protective cover in the embodiment of the present application (viewed from the inside of the protective cover); Figure 4 is a schematic view of the axial cross-sectional structure along line E-E in the middle;

[0031] Figure 6 is a schematic view of the axial cross-sectional structure along line E-E in the middle; Figure 5 is an enlarged structural schematic view of part F in the middle;

[0032] Figure 7Axial sectional structure schematic diagram of the protective cover in the embodiment of the present application after being installed on the rim, located at the end of the axle;

[0033] Figure 8 For Figure 7 Enlarged structure schematic diagram of the middle G part;

[0034] Figure 9 For the three-dimensional structure schematic diagram of the protective cover in the embodiment of the present application Figure 1 (not installed plug-in);

[0035] Figure 10 For the three-dimensional structure schematic diagram of the protective cover in the embodiment of the present application Figure 2 (installed plug-in);

[0036] Figure 11 For Figure 10 Enlarged structure schematic diagram of the middle I part;

[0037] Figure 12 For Figure 11 Structure schematic diagram of the middle part after removing the plug-in;

[0038] Figure 13 For Figure 9 Enlarged structure schematic diagram of the middle L part;

[0039] Figure 14 For the principle process schematic diagram when installing the plug-in in the embodiment of the present application;

[0040] Figure 15 For the structure schematic diagram when the elastic sheet contacts with the end of the rim groove part of the rim to form the contact part three in the embodiment of the present application;

[0041] Figure 16 For Figure 5 Local sectional structure schematic diagram of the protective cover in the embodiment of the present application, located at one spring clip elastic sheet;

[0042] In the figure: 1. Steel wheel, 2. Bearing wheel, 3. Guide wheel, 4. Steel rail, 5. Rubber-tired track, 6. Guide track, 7. Rim, 711. Rim groove part, 712. Groove slope, 8. Axle, 9. Tire, 10. Guard, 101. Guard ring body, 102. Circular surface, 103. Guard groove body, 11. Power supply line, 12. Spring clip, 121. Spring clip hook part, 13. Bolt one, 131. Nut one, 132. Screw rod part one, 14. Nut, 15. Plug, 151. Plug slope, 16. Plug mounting seat, 161. Plug slot, 1611. Inner notch, 1612. Outer notch, 162. Thread hole, 163. Through hole, 17. Plug screw, 18. Spring clip, 19. Lock nut, 20. Bolt two, 201. Nut two, 202. Screw rod part two, 21. Insulating sleeve, 22. Insulating threaded cap. DETAILED DESCRIPTION

[0043] The technical solutions of the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0044] In daily work, when the guard often falls off, the applicant found one of the reasons through research that in actual application, the guard is in a high-frequency vibration working environment, and since the guard is connected by several spring clips and rim groove parts, as shown in Figure 3 , the spring clip and the rim groove part form a contact part one (such as Figure 3 H1 part), since the contact area of the contact part one is limited, therefore in the long-term high-frequency vibration working environment, the guard will appear the phenomenon of circumferential rotation, so that the contact part of the spring clip and the rim groove part is misaligned, when the contact part of the spring clip and the rim groove part is completely misaligned and separated, it will cause the guard to fall off from the outer side of the rim 7.

[0045] Embodiment one: as shown in Figure 4 to Figure 6 , the applicant improves by setting a plurality of plugs 15 on the inner side B of the guard 10 along the circumferential direction of the guard 10, each plug 15 can extend along the radial direction of the guard 10. As shown in Figure 7 and Figure 8As shown, when the protective cover 10 is installed, one end of each of the pins 15 is inserted into the rim groove portion 711 of the rim along the radial direction of the protective cover 10 to form a contact portion two H2 in contact with the rim groove portion 711. Since the contact portion two H2 also has a certain contact area, when there is a tendency of relative circumferential rotation between the rim and the protective cover in a vibrating working environment, the frictional resistance is generated by the contact portion two H2 between the pin 15 and the rim groove portion 711 to prevent the circumferential rotation of the protective cover 10. In the present embodiment, the circumferential rotation of the protective cover is prevented not only by the frictional resistance generated by the contact portion one D between the spring clip and the rim groove portion as in the prior art, but also by the frictional resistance generated by the contact portion two H2 between the pin and the rim groove portion, so that the circumferential rotation of the protective cover is better prevented. In fact, in the actual working environment, when there is a tendency of circumferential rotation of the protective cover, the circumferential rotation of the protective cover is prevented by increasing the frictional resistance between the rim groove portion of the rim and the protective cover, so that the circumferential rotation of the protective cover is effectively prevented in a high-frequency vibrating working environment, thereby avoiding the protective cover from falling off due to the circumferential rotation of the protective cover.

[0046] As shown in Figure 6 and Figure 8 , a pin inclined surface 151 is arranged on the end of the pin 15 extending out, and a groove inclined surface 712 matching the pin inclined surface 151 is arranged on the inner side of the rim groove portion 711 of the rim; when one end of the pin 15 is inserted into the rim groove portion 711 of the rim to form the contact portion two H2 in contact with the rim groove portion 711, the contact portion two H2 is formed by the pin inclined surface 151 of the pin 15 in contact with the groove inclined surface 712 of the rim groove portion 711. In this way, the contact area of the contact portion two H2 is further increased, so that the frictional resistance generated by the contact portion two H2 is further increased, and the circumferential rotation of the protective cover is better prevented.

[0047] As shown in Figure 4 , a plurality of spring clips 12 and a plurality of pins 15 are arranged in a staggered manner along the circumference of the protective cover; in the present figure, there are three spring clips 12 and three pins 15 arranged in a staggered manner therebetween, so that the frictional resistance between the rim groove portion and the protective cover is further increased to prevent the circumferential rotation of the protective cover.

[0048] As shown in Figure 4 , the maximum outer diameter of the plurality of pins 15 is d1 with the center axis F1 of the protective cover 10 as the center, as shown in Figure 2 , the minimum inner diameter of the rim groove portion 711 of the rim 7 is d2 with the center axis F2 of the rim 7 as the center. Then from Figure 8As can be seen, when the protective cover 10 is installed, the maximum outer diameter d1 of the pin is greater than the minimum inner diameter of the rim groove portion, and the pin 15 is not elastic like the snap spring leaf 12, so when the protective cover 10 is installed, interference will occur between the pin 15 and the rim groove portion 711, so it cannot be installed. In order to solve the above problem, after research, the applicant designs the connection structure between the pin 15 and the protective cover 10 as a detachable connection structure, when installing the protective cover, first, the protective cover 10 is preliminarily installed by hooking and connecting the spring hook portion 121 of the plurality of snap spring leaves 12 and the inner side portion of the rim groove portion 711 of the rim together (as shown in Figure 7 ), and then the pin 15 is installed on the inner side portion of the protective cover 10 from the outer side portion of the protective cover 10 through the detachable structure, so that one end of the pin 15 protrudes into the rim groove portion 711 of the rim and contacts the rim groove portion 711.

[0049] The specific detachable structure is shown in Figure 9 and Figure 10 , a plurality of cuboid-shaped pin mounting seats 16 are arranged on the inner side portion of the protective cover 10 along the circumferential direction of the protective cover 10, the pin mounting seat 16 and the protective cover 10 are an integral structure, as shown in Figure 12 and Figure 13 , the outer side surface J of each of the pin mounting seats 16 is parallel to the peripheral surface of the protective cover 10, the bottom surface K of the pin mounting seat 16 is perpendicular to the axis of the protective cover 10, the outer side surface J is adjacent to the bottom surface K, a pin through groove 161 is formed on the outer side surface J of the pin mounting seat 16 along the radial direction of the protective cover 10, the inner groove 1611 at one end of the pin through groove 161 is located in the inner space of the protective cover 10, the outer groove 1612 at the other end of the pin through groove 161 is located in the outer space of the protective cover 10, and the outer space of the protective cover 10 and the inner space of the protective cover 10 are connected through the pin through groove 161. Threaded holes 162 and through holes 163 are arranged on the opposite sides of the pin through groove 161 along the direction parallel to the central axis F1 of the protective cover 10, the threaded holes 162 are located on the bottom surface K of the pin mounting seat 16, and the through holes 163 are connected with the outer space of the protective cover.

[0050] When the protective cover 10 is hooked and connected to the outer side end surface of the rim 7 through the snap spring leaf 12, the pin 15 is inserted into the pin through groove 161 from the outer space of the protective cover 10 through the outer groove 1612 of the pin through groove 161 (as shown in Figure 14 ), so that one end of the pin 15 passes through the inner groove 1611 of the pin through groove 161 and protrudes into the rim groove portion 711 of the rim to contact the rim groove portion 711 (as shown in Figure 11 and Figure 8As shown), the pin 15 is finally locked onto the pin mounting base 16 by passing the pin screw 17 through the through hole 163 and the pin 15 and screwing it into the threaded hole 162. Since the nut of the pin screw 17 is located on the outer side of the protective cover 10 after installation, the pin screw 17 is made of insulating non-metallic material to prevent arcing. In this embodiment, as... Figure 5 and Figure 9 As shown, the protective cover 10 includes a protective cover ring 101, a circular surface 102 located within the protective cover ring 101, and a protective cover recess 103 located between the protective cover ring 101 and the circular surface 102. The circular surface 102 and the protective cover ring 101 are connected by the protective cover recess 103. The circular surface 102, the protective cover ring 101, and the protective cover recess 103 are an integral structure. Figure 13 As shown, the outer groove 1612 of the pin through groove 161 is connected to the protective cover groove 103.

[0051] To further increase the frictional resistance between the rim groove and the protective cover to prevent circumferential rotation of the protective cover, such as Figure 10 As shown, a plurality of spring clips 18 are also provided on the inner side B of the protective cover 10 along the circumference of the protective cover 10. The spring clips 18 may be made of plastic. The length direction of the spring clips 18 is arranged parallel to the central axis F1 of the protective cover 10. When the protective cover 10 is installed, as... Figure 15 As shown, one side of the spring piece 18 contacts the end of the rim groove 711 of the rim 7 to form a contact portion three H3. In a high-frequency vibration operating environment, the contact portion three H3 generates frictional resistance, which better prevents the protective cover from rotating circumferentially. Preferably, the end of the rim groove 711 located at the contact portion three H3 is designed as a plane that matches the side of the spring piece 18, thereby further increasing the frictional resistance at this point and preventing the protective cover from rotating circumferentially.

[0052] The applicant conducted a vibration test on the improved protective cover to verify its effectiveness. The steps were as follows:

[0053] S1. Before the test, install the sample on the test fixture, mark the connection between the product and the fixture, and observe whether the marked position is misaligned after the test.

[0054] S2. Conduct vibration tests under the following conditions.

[0055]

[0056] S3. Judgment requirement: After the vibration test, the sample is not allowed to rotate relative to the test fixture in the circumferential direction.

[0057] Tests were conducted on multiple test samples, and the results showed that none of the test samples exhibited relative rotation with respect to the test fixture in the circumferential direction.

[0058] In addition, such as Figure 16 As shown, in this embodiment, the locking nut 19 and bolt 20 are used to lock the retaining spring 12 onto the inner side B of the protective cover 10, thereby increasing the stability of the connection. Bolt 20 is longer than bolt 13. The locking nut 19 is a type 2 non-metallic insert hexagonal flange locking nut according to GB / T 6183.1-2016, with a size specification of M10. The reason for increasing the length of bolt 20 is twofold: firstly, the thickness of this locking nut (along the bolt's axial direction) is thicker than that of ordinary nuts, and if bolt 13 of the previous length is used, it will not be able to match the locking nut 19; secondly, increasing the length of bolt 20 also improves the stability of the connection from another aspect.

[0059] However, if the bolt 20 is installed in the same way after its length is increased, it will interfere with the deformation space of the retaining spring 12. Therefore, in this embodiment, the bolt 20 is installed in reverse. That is, the retaining spring 12 is connected by the bolt 20 through the inner part B of the protective cover 10, through the retaining spring 12 and the protective cover 10, towards the outer part C of the protective cover 10, and locked with the anti-loosening nut 19. After installation, the nut 201 of the bolt 20 is located inside the protective cover 10, and the screw part 202 of the bolt 20 and the anti-loosening nut 19 are located outside the protective cover 10. As can be seen from the figure, after this reverse installation, the closest distance L between the nut 201 and the retaining spring 12 is relatively large, thus leaving sufficient elastic deformation space for the retaining spring 12. An insulating component is installed outside the screw section 202 and the anti-loosening nut 19 located on the outer side of the protective cover 10. This ensures that the screw section 202 and the anti-loosening nut 19 are located inside the insulating component, thereby preventing the risk of arcing between them and the power supply line. The insulating component includes an insulating sleeve 21 and an insulating threaded cap 22. The insulating sleeve 21 is fitted onto the outside of the screw section 202 and the anti-loosening nut 19. The insulating threaded cap 22 is then tightened onto the end of the screw section 202. The insulating sleeve 21 is pressed against the outer side C of the protective cover 10 by the insulating threaded cap 22, thus placing the screw section 202 and the anti-loosening nut 19 inside the insulating sleeve 21 and the insulating threaded cap 22 for insulation. The insulating sleeve 21 can be made of nylon, and the insulating threaded cap 22 can be made of non-metallic threaded caps, such as those made of plastic or polymer materials.

[0060] In summary, the present application not only generates friction resistance through the contact part D between the circlip spring leaf and the rim groove part to prevent the protective cover from rotating circumferentially, but also generates friction resistance through the contact part H2 between the latch and the rim groove part to better prevent the protective cover from rotating circumferentially. In fact, the present application increases the friction resistance between the rim groove part of the rim and the protective cover to prevent the protective cover from rotating circumferentially when the protective cover tends to rotate circumferentially in the actual working environment. Therefore, the present application can effectively prevent the protective cover from rotating circumferentially in a high-frequency vibration working environment, thereby avoiding the protective cover from falling off due to circumferential rotation. The contact part H2 is designed as a bevel contact to further increase the friction resistance generated by the contact part H2, which can better prevent the protective cover from rotating circumferentially. The staggered distribution of multiple circlip spring leaves and multiple latches can further increase the friction resistance between the rim groove part and the protective cover to prevent the protective cover from rotating circumferentially. The disassembly structure between the latch and the protective cover allows the present application to initially install the protective cover on the outer side end of the rim through the circlip spring leaf, and then insert the latch into contact with the rim groove part of the rim, which not only increases the friction resistance through the cooperation of the latch and the rim groove part, but also facilitates the installation and disassembly of the latch, which is simple and practical. The additional spring leaf contacts the end of the rim groove part of the rim to form a contact part three, which further increases the friction resistance to prevent the protective cover from rotating circumferentially.

[0061] The "multiple" in the embodiment refers to "two or more" in number. The above embodiments are only used to illustrate the present application and are not limited to the present application. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present application. Therefore, all equivalent technical solutions should belong to the protection scope of the present application, and the protection scope of the present application should be defined by the claims.

Claims

1. A method for preventing circumferential rotation of a protective cover for a load-bearing wheel in a rubber-tired and steel-wheeled subway system, characterized in that: Prevent the guard shield from circumferential rotation by increasing the friction resistance between the rim groove part of the rim and the guard shield; A plurality of pins are arranged on the inner side of the guard shield along the circumferential direction of the guard shield, and each pin can extend along the radial direction of the guard shield; When the guard shield is hooked on the outer side end surface of the rim by the plurality of spring clips on the inner side of the guard shield and the rim groove part of the rim, the plurality of pins are then extended along the radial direction of the guard shield and inserted into the rim groove part of the rim to form a second contact part (H2) in contact with the rim groove part, and the second contact part (H2) generates friction resistance to prevent the guard shield from circumferential rotation; An inclined surface is arranged on one end of the pin, and an inclined groove surface matching the inclined surface of the pin is arranged on the inner side surface of the rim groove part of the rim; when one end of the pin is inserted into the rim groove part of the rim to form the second contact part (H2) in contact with the rim groove part, the second contact part (H2) is formed by the inclined surface of the pin being in contact with the inclined groove surface of the rim groove part.

2. The anti-rotation method of claim 1, wherein: The plurality of spring clips and the plurality of pins are arranged in an interlaced manner.

3. The anti-rotation method of claim 1, wherein: The plurality of pins are arranged on the inner side of the guard shield through a detachable connection structure; the pins are not installed before the guard shield is installed, and after the guard shield is hooked on the outer side end surface of the rim by the plurality of spring clips on the inner side of the guard shield and the rim groove part of the rim, the pins are installed on the guard shield so that one end of the pin is inserted into the rim groove part of the rim to form the second contact part (H2) in contact with the rim groove part.

4. The anti-rotation method of claim 3, wherein: The detachable connection structure comprises a plurality of pin mounting seats arranged on the inner side of the guard shield along the circumferential direction of the guard shield; a pin through groove is formed in the pin mounting seat along the radial direction of the guard shield, one end of the pin through groove is an inner slot opening in the inner space of the guard shield, the other end of the pin through groove is an outer slot opening in the outer space of the guard shield, and a threaded hole and a through hole are arranged on the opposite sides of the pin through groove along the direction parallel to the central axis of the guard shield; After the guard shield is hooked on the outer side end surface of the rim by the plurality of spring clips on the inner side of the guard shield and the rim groove part of the rim, the pin is inserted into the pin through groove through the outer slot opening of the pin through groove from the outer space of the guard shield, so that one end of the pin extends into the rim groove part of the rim through the inner slot opening of the pin through groove to be in contact with the rim groove part, and finally the pin screw is screwed into the threaded hole through the through hole and the pin, so as to lock the pin on the pin mounting seat.

5. The anti-rotation method of claim 4, wherein: The pin screw is made of insulating non-metallic material.

6. The anti-rotation method according to any one of claims 1 to 5, characterized in that: A plurality of spring clips are arranged on the inner side of the guard shield along the circumferential direction of the guard shield, and the length direction of the spring clip is arranged along the direction parallel to the central axis of the guard shield; When the guard shield is installed, one side surface of the spring clip is in contact with the end part of the rim groove part of the rim to form a third contact part (H3).

7. The anti-rotation method of claim 6, wherein: The end part of the rim groove part at the third contact part (H3) is designed as a plane matching the side surface of the spring clip; the third contact part (H3) is formed by the side surface of the spring clip being in contact with the plane of the end part of the rim groove part.

8. The anti-rotation method of claim 6, wherein: The spring clip is made of plastic material.

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