Sealing protection mechanism of thrust wheel

Abstract

The invention belongs to the field of four wheels and one accessory of an excavator, and particularly relates to a sealing protection mechanism of a thrust wheel, which comprises a thrust wheel body, and a pair of end covers are arranged at the end part of the thrust wheel body; the end part of the end cover is in threaded connection with a pair of fixing bolts; a plug is arranged at the end of the fixing bolt on one side. A positioning pin is in sliding fit with the middle of the fixing bolt; the side wall of the fixing bolt is fixedly connected with a first step block. A wheel shaft is in sliding fit with the middle part of the thrust wheel body; the inner wall of the thrust wheel body is fixedly connected with a pair of second step blocks; a plurality of lip-shaped rubber seals are arranged between the second step block and the first step block; second step blocks and fixing bolts are provided with a step type composite sealing structure, the step type composite sealing structure is composed of the second step block on the inner side and the first step block on the outer side, the adaptive gap between a lip of the second step block and a wheel shaft is controlled to range from 0 mm to 2 mm, the sealing elasticity is enhanced, and the sediment invasion amount in a wheel body is reduced; and the clamping stagnation of the bearing caused by sealing failure is reduced.

Description

Technical Field

[0001] This invention relates to the field of excavator track components, specifically a sealing and protection mechanism for track rollers. Background Technology

[0002] Track rollers, as a key component of the excavator's travel system, are used to support the weight of the excavator, roll on the track rails to ensure the excavator travels and operates smoothly, bear the load transmitted by the track chains, reduce friction between the tracks and the ground, and extend the service life of the tracks and the entire machine's travel mechanism.

[0003] Track rollers mainly consist of a wheel body, axle, bearings, and oil seals. The wheel body is made of cast steel and is formed by casting and machining. The axle is a solid steel axle that passes through the wheel body, and the bearings enable the wheel body to rotate relative to the axle. The oil seal is a common rubber seal that is installed at the mating point between the wheel body and the axle to prevent mud, sand, and water from entering the wheel body. The relationship between the components is as follows: the bearing is installed in the inner hole of the wheel body, and after the axle is inserted, the bearing supports the rotation of the wheel body. The oil seal is fitted on the axle and fits against the end cap of the wheel body to form a sealed space, ensuring bearing lubrication and a suitable working environment.

[0004] The existing track rollers have a simple structure with ordinary rubber oil seals. In the harsh working environment of excavators, mud, sand and water can easily break through the oil seals and enter the inside of the roller, causing the bearing lubrication to fail, accelerating bearing wear and corrosion, and causing the track roller to jam.

[0005] Therefore, a sealing and protection mechanism for the support roller is proposed to address the above problems. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: A sealing and protection mechanism for a support roller, comprising a support roller body, a pair of end caps at the end of the support roller body; a pair of fixing bolts threadedly connected to the end of the end caps; a plug at the end of one side of the fixing bolt; a locating pin slidably fitted in the middle of the fixing bolt; a first stepped block fixedly connected to the side wall of the fixing bolt; an axle slidably fitted in the middle of the support roller body; a pair of second stepped blocks fixedly connected to the inner wall of the support roller body; multiple lip-shaped rubber seals provided between the second stepped blocks and the first stepped blocks; by setting the second stepped blocks and the first stepped blocks into a stepped composite sealing structure, consisting of an inner second stepped block and an outer first stepped block, the fitting gap between the lip of the second stepped block and the axle is controlled between 0.1-0.2 mm, enhancing the sealing elasticity, reducing the amount of mud and sand intrusion into the wheel body, and reducing bearing jamming caused by seal failure.

[0008] Preferably, a baffle is rotatably connected to one side wall of the end cap; a sealing gasket is provided between the baffle and the end cap; a support plate is fixedly connected to the middle of one side of the end cap; the support plate is located below the sealing gasket; by adding the baffle, the sealing gasket can be squeezed by the baffle during the use of the plug, so that the sealing gasket adheres to the surface of the plug, thereby protecting the plug and reducing the movement of mud and sand onto the plug. At the same time, when injecting oil through the plug, the baffle can also be rotated open, thereby opening the plug and reducing the impact on the operation of the plug.

[0009] Preferably, a plurality of springs are fixedly connected to the inner wall of the baffle; a push plate is fixedly connected to the end of the spring; the push plate is located between the spring and the sealing pad; by adding springs, the sealing pad and the plug can be more closely fitted when the sealing pad is placed, thereby increasing the force on the sealing pad and keeping the sealing pad in contact with the surface of the plug.

[0010] Preferably, the inner wall of the baffle is fixedly connected with multiple protective cloths; the ends of the protective cloths and the sealing gaskets are fixedly connected; the protective cloths are sleeved on the surface of the spring; by adding protective cloths, the spring can be protected when it is working, thereby increasing the protection of the spring and reducing the impact of impurities on the spring.

[0011] Preferably, a gasket is provided between the end cap and the fixing bolt; the gasket and the fixing bolt are correspondingly provided; by adding the gasket, the friction between the fixing bolt and the end cap can be increased during the installation of the fixing bolt, thereby increasing the stability of the fixing bolt when fixing the end cap after installation.

[0012] Preferably, a lifting rod is fixed to the top of the positioning pin; the lifting rod and the positioning pin are correspondingly arranged; by adding the lifting rod, the force-bearing area of ​​the top of the positioning pin can be increased after the positioning pin is inserted into the end cap, thereby increasing the contact of the positioning pin when it is removed, making it more convenient to remove.

[0013] Preferably, the bottom of the lifting rod is provided with an installation thread; a stop block is slidably connected to the surface of the lifting rod; the stop block and the installation thread are threadedly connected; by adding the stop block and the installation thread, the connection between the end cover and the positioning pin can be closed by the stop block after the positioning pin is installed, and the installation thread can fix the stop block through the thread, thereby increasing stability. The installation thread is only partial, so it will not protrude after the stop block is fixed, and the installation thread is still inside the stop block.

[0014] Preferably, the end of the lifting rod is provided with a groove; multiple grooves are provided on the lifting rod; by adding grooves, the resistance to the tool sliding on the lifting rod can be increased when the lifting rod is pulled, thereby making it more stable when moving in the clamp.

[0015] The advantages of this invention are: 1. The sealing and protection mechanism of the support roller of the present invention is provided with a stepped composite sealing structure by setting the second step block and the first step block with a stepped structure, which is composed of the inner second step block and the outer first step block. The fitting gap between the lip of the second step block and the wheel axle is controlled between 0.1 and 0.2 mm, which enhances the sealing elasticity, reduces the amount of mud and sand intrusion into the wheel body, and reduces the jamming of the bearing due to sealing failure.

[0016] 2. The sealing and protection mechanism of the support roller described in this invention, by adding a baffle, allows the sealing gasket to be squeezed against the surface of the plug during use, thereby protecting the plug and reducing the movement of mud and sand onto the plug. At the same time, when oil is injected through the plug, the baffle can be rotated to open, thereby opening the plug and reducing the impact on the operation of the plug. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the main body of the present invention; Figure 2 This is a schematic diagram of the lifting rod in this invention; Figure 3 This is a schematic diagram of the plug structure in this invention; Figure 4 This is a schematic diagram of the baffle structure in this invention; Figure 5 This is a schematic diagram of the structure of the second step block in this invention; Figure 6 This is a schematic diagram of the lip-shaped rubber seal in this invention.

[0019] In the diagram: 1. Support roller body; 11. End cap; 12. Fixing bolt; 13. Plug; 14. Locating pin; 15. First step block; 16. Second step block; 17. Lip seal; 18. Axle; 2. Baffle; 21. Sealing gasket; 22. Support plate; 3. Spring; 31. Push plate; 4. Protective cloth; 5. Gasket; 6. Lifting rod; 7. Mounting thread; 71. Stop block; 8. Groove. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Specific implementation examples are given below.

[0022] Please see Figures 1 to 6 As shown in the embodiment of the present invention, a sealing and protective mechanism for a support roller includes a support roller body 1. A pair of end caps 11 are provided at the ends of the support roller body 1. A pair of fixing bolts 12 are threadedly connected to the ends of the end caps 11. A plug 13 is provided at one end of each fixing bolt 12. A locating pin 14 is slidably fitted in the middle of the fixing bolt 12. A first stepped block 15 is fixedly connected to the side wall of the fixing bolt 12. An axle 18 is slidably fitted in the middle of the support roller body 1. A pair of second stepped blocks 16 are fixedly connected to the inner wall of the support roller body 1. Multiple lip-shaped rubber seals 17 are provided between the second stepped blocks 16 and the first stepped blocks 15. During operation, when machining the support roller body 1 as a whole, the wheel body base is made of high-strength ductile iron to ensure overall mechanical properties. A ring-shaped seal is inlaid on the rim surface that contacts the track. Wear-resistant alloy steel is used to achieve metallurgical bonding through centrifugal casting, which improves wear resistance. The inner part of the support roller body 1 is designed with annular reinforcing ribs of varying thickness, which are evenly distributed on the spokes of the support roller body 1 to enhance the deformation resistance of the support roller body 1. During assembly, the axle 18 is first inserted into the middle of the support roller body 1, and then multiple lip-shaped rubber seals 17 are placed next to the second step block 16 in sequence. Then, a pair of end caps 11 are inserted into the support roller body 1 for installation and fixation. By setting the second step block 16 and the first step block 15 into a stepped composite sealing structure, which consists of the inner second step block 16 and the outer first step block 15, the fitting gap between the lip of the second step block 16 and the axle 18 is controlled between 0.1 and 0.2 mm, which enhances the sealing elasticity, reduces the amount of mud and sand intrusion into the wheel body, and reduces the bearing jamming caused by seal failure.

[0023] Please see Figures 1 to 3As shown, a baffle 2 is rotatably connected to the side wall of one end cap 11; a sealing gasket 21 is provided between the baffle 2 and the end cap 11; a support plate 22 is fixedly connected to the middle of one end cap 11; the support plate 22 is located below the sealing gasket 21; during operation, when the support roller 1 is in use, the baffle 2 is rotated so that the baffle 2 moves to the surface of the support plate 22. After moving, the sealing gasket 21 is inserted between the baffle 2 and the end cap 11, thereby closing the plug 13; by adding the baffle 2, the sealing gasket 21 can be squeezed by the baffle 2 during the use of the plug 13, so that the sealing gasket 21 adheres to the surface of the plug 13, thereby protecting the plug 13 and reducing the movement of mud and sand onto the plug 13. At the same time, when oil is injected through the plug 13, the baffle 2 can also be rotated to open, thereby opening the plug 13 and reducing the impact on the operation of the plug 13.

[0024] Please see Figures 1 to 4 As shown, multiple springs 3 are fixedly connected to the inner wall of the baffle 2; a push plate 31 is fixedly connected to the end of the spring 3; the push plate 31 is located between the spring 3 and the sealing pad 21; during operation, when the baffle 2 is moved, the spring 3 and the push plate 31 will move together. After the movement, when the push plate 31 contacts the sealing pad 21, the thickness of the sealing pad 21 will push the push plate 31. At this time, the spring 3 will be compressed, and then the thrust generated by the compression will squeeze the sealing pad 21, thereby adhering to the plug 13 and closing the plug 13; by adding springs 3, the adhesion between the sealing pad 21 and the plug 13 can be increased when the sealing pad 21 is placed, thereby increasing the force on the sealing pad 21 and keeping the sealing pad 21 always adhering to the surface of the plug 13.

[0025] Please see Figure 4 As shown, multiple protective cloths 4 are fixedly connected to the inner wall of the baffle 2; the ends of the protective cloths 4 and the sealing gaskets 21 are fixedly connected; the protective cloths 4 are sleeved on the surface of the spring 3; during operation, when in the working environment, the protective cloths 4 will block the surrounding dirt and dust from the spring 3. When dirt and dust approach the spring 3, the protective cloths 4 will intercept these impurities; by adding protective cloths 4, the spring 3 can be protected when it is working, thereby increasing the protection of the spring 3 and reducing the impact of impurities on the spring 3.

[0026] Please see Figure 3 As shown, a gasket 5 is provided between the end cap 11 and the fixing bolt 12; the gasket 5 and the fixing bolt 12 are correspondingly arranged; during operation, when installing the fixing bolt 12, the gasket 5 is first placed on the fixing bolt 12, and then after the fixing bolt 12 is installed, the gasket 5 will be located between the fixing bolt 12 and the end cap 11; by adding the gasket 5, the friction between the fixing bolt 12 and the end cap 11 can be increased when the fixing bolt 12 is installed, thereby increasing the stability of the fixing bolt 12 when fixing the end cap 11 after installation.

[0027] Please see Figure 3 As shown, a lifting rod 6 is fixedly connected to the top of the positioning pin 14; the lifting rod 6 and the positioning pin 14 are correspondingly arranged; during operation, when the positioning pin 14 needs to be pulled out after insertion, the lifting rod 6 can be clamped, and then the positioning pin 14 can be pulled out from the inside of the end cover 11 through the lifting rod 6; by adding the lifting rod 6, the force-bearing area of ​​the top of the positioning pin 14 can be increased after the positioning pin 14 has penetrated into the inside of the end cover 11, thereby increasing the contact of the positioning pin 14 when it is removed, making it more convenient to remove.

[0028] Please see Figure 3 As shown, the bottom of the lifting rod 6 is provided with an installation thread 7; a stop 71 is slidably connected to the surface of the lifting rod 6; the stop 71 and the installation thread 7 are threadedly connected; during operation, after the positioning pin 14 is inserted into the end cover 11, the stop 71 can be inserted from the end of the lifting rod 6 onto the lifting rod 6, and then the stop 71 is moved down onto the installation thread 7 and rotated to continue moving the stop 71 down; by adding the stop 71 and the installation thread 7, the connection between the end cover 11 and the positioning pin 14 can be closed by the stop 71 after the positioning pin 14 is installed, and at the same time, the installation thread 7 can fix the stop 71 through the thread, thereby increasing stability. The installation thread 7 is only partially installed, so it will not protrude after the stop 71 is fixed, and the installation thread 7 is still inside the stop 71.

[0029] Please see Figures 2 to 3 As shown, a groove 8 is provided at the end of the lifting rod 6; multiple grooves 8 are provided on the lifting rod 6; during operation, when the lifting rod 6 is clamped, the groove 8 increases the friction of movement during contact; by increasing the groove 8, the resistance of the tool sliding on the lifting rod 6 can be increased when the lifting rod 6 is pulled, thereby making the movement during clamping more stable.

[0030] Working principle: When machining the entire track roller body 1, the base material is made of high-strength ductile iron to ensure overall mechanical properties. The rim surface in contact with the track is inlaid with annular wear-resistant alloy steel, which is metallurgically bonded through centrifugal casting to improve wear resistance. The track roller body 1 is internally designed with annular reinforcing ribs of varying thickness, evenly distributed along the spokes to enhance its resistance to deformation. During assembly, the axle 18 is first inserted into the middle of the track roller body 1, and then multiple lip-shaped rubber seals are installed. Seal 17 is placed next to the second step block 16, and then a pair of end caps 11 are inserted into the support roller body 1 for installation and fixation. During the use of the support roller body 1, the baffle 2 is rotated so that it moves to the surface of the support plate 22. After moving, the sealing gasket 21 is inserted between the baffle 2 and the end cap 11, thereby closing the plug 13. When the baffle 2 is moved, it will drive the spring 3 and the push plate 31 to move together. After moving, when the push plate 31 and the sealing gasket 21 come into contact, the sealing gasket will... The thickness of 21 pushes the push plate 31, at which time the spring 3 will be compressed. Then, the thrust generated by the compression squeezes the sealing gasket 21, thereby adhering it to the plug 13 and closing the plug 13. When in the working environment, the protective cloth 4 will block the surrounding dirt and dust from the spring 3. When dirt and dust approach the spring 3, the protective cloth 4 will intercept these impurities. When installing the fixing bolt 12, the gasket 5 is first placed on the fixing bolt 12, and then the gasket is placed after the fixing bolt 12 is installed. 5 will be located between the fixing bolt 12 and the end cap 11; when the positioning pin 14 needs to be pulled out after insertion, the lifting rod 6 can be clamped, and then the positioning pin 14 can be pulled out from the inside of the end cap 11 through the lifting rod 6; after the positioning pin 14 is inserted into the inside of the end cap 11, the stop block 71 can be inserted from the end of the lifting rod 6 onto the lifting rod 6, and then the stop block 71 is moved down onto the mounting thread 7. At this time, it can be rotated to continue to move the stop block 71 down; when the lifting rod 6 is clamped, the groove 8 increases the friction of movement during contact.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A sealing and protective mechanism for a support roller, comprising a support roller body (1), characterized in that: The support roller body (1) is provided with a pair of end caps (11) at its end; the end caps (11) are threadedly connected to a pair of fixing bolts (12); a plug (13) is provided at the end of one side of the fixing bolt (12); a locating pin (14) is slidably fitted in the middle of the fixing bolt (12); a first step block (15) is fixedly connected to the side wall of the fixing bolt (12); an axle (18) is slidably fitted in the middle of the support roller body (1); a pair of second step blocks (16) are fixedly connected to the inner wall of the support roller body (1); a plurality of lip-shaped rubber seals (17) are provided between the second step blocks (16) and the first step blocks (15).

2. The sealing and protective mechanism for a support roller according to claim 1, characterized in that: A baffle (2) is rotatably connected to the side wall of one end cap (11); a sealing gasket (21) is provided between the baffle (2) and the end cap (11); a support plate (22) is fixedly connected to the middle of one end cap (11); the support plate (22) is located below the sealing gasket (21).

3. The sealing and protective mechanism for a support roller according to claim 2, characterized in that: Multiple springs (3) are fixed to the inner wall of the baffle (2); a push plate (31) is fixed to the end of the spring (3); the push plate (31) is located between the spring (3) and the sealing pad (21).

4. The sealing and protective mechanism for a support roller according to claim 3, characterized in that: Multiple protective cloths (4) are fixed to the inner wall of the baffle (2); the ends of the protective cloths (4) and the sealing pads (21) are fixedly connected; the protective cloths (4) are sleeved on the surface of the spring (3).

5. The sealing and protective mechanism for a support roller according to claim 4, characterized in that: A gasket (5) is fitted between the end cap (11) and the fixing bolt (12); the gasket (5) and the fixing bolt (12) are correspondingly arranged.

6. The sealing and protective mechanism for a support roller according to claim 5, characterized in that: The top of the positioning pin (14) is fixedly connected to the lifting rod (6); the lifting rod (6) and the positioning pin (14) are set accordingly.

7. The sealing and protective mechanism for a support roller according to claim 6, characterized in that: The bottom of the lifting rod (6) is provided with an installation thread (7); a stop (71) is slidably connected to the surface of the lifting rod (6); the stop (71) and the installation thread (7) are threadedly connected.

8. The sealing and protective mechanism for a support roller according to claim 7, characterized in that: The lifting rod (6) has a groove (8) at its end; there are multiple grooves (8) on the lifting rod (6).

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