Rolling sliding block for telescopic boom

Abstract

The rolling sliding block comprises a plurality of rolling wheels, the rolling wheels are rotatably installed on the inner sides of the arm head and the arm tail of the arm frame, and the rolling wheels are in rolling contact with the outer side of another arm frame installed in the arm frame where the rolling wheels are located. Rolling friction contact between the telescopic arm and the sliding block is achieved, the service life of the sliding block is prolonged, the maintenance cost is reduced, the telescopic resistance between the arm supports is reduced, and the arm supports stretch more stably and smoothly.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery technology, and particularly relates to a rolling slider for telescopic booms. Background Technology

[0002] In recent years, with the rapid development of construction machinery, telescopic boom structures have been widely used in the construction machinery field. Telescopic booms are telescopic, which can meet the needs of different working conditions at different heights and transportation size restrictions.

[0003] As the load-bearing structure of a telescopic boom, the slider, especially the slider under each boom section, serves as a key support point for boom extension and retraction, and its reliability directly affects the boom's operational performance. Current slider designs are mostly regular rectangular structures made of ultra-high molecular weight polyethylene, and the friction between the slider and the boom is sliding friction. Regarding the slider below the boom head, due to sliding friction, even if the slider is made of highly wear-resistant ultra-high molecular weight polyethylene, a certain amount of wear will still occur on the slider friction surface as working time increases and impurities enter. Once the wear exceeds a certain amount, it will cause boom vibration, and may even lead to contact with the head of the fixing bolts embedded inside the slider, resulting in damage to the boom surface and abnormal noise. Because the boom structure is not a theoretically flat plane, the contact between the boom and the slider is not uniform across the entire mating surface, but rather a localized contact. Ultimately, the irregular shape of the slider wear affects the stress on the boom contact area, accelerating boom structural damage and even impacting the safety of high-altitude operations. Since slider friction involves surface contact, the slider's hardness directly affects the stability of boom extension and retraction. Abnormal wear of the slider, or poor machining accuracy of the boom cross-section, will cause boom vibration. This slider design requires high wear resistance from the slider and high precision in the machining of the boom section, resulting in high application costs. The design also requires users to replace the slider regularly. For multi-section telescopic booms, slider replacement is difficult due to limitations of other structures at the boom head, increasing usage and maintenance costs. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a rolling slider for telescopic booms, which realizes rolling friction contact between the boom and the slider, improves the service life of the slider and reduces maintenance costs, reduces the telescopic resistance between booms, and makes the boom telescopic movement more stable and smooth.

[0005] To solve the above-mentioned technical problems, the present invention is implemented using the following solution: The present invention provides a rolling slider for a telescopic boom, including a plurality of rollers, which are rotatably mounted on the inner side of the boom head and boom tail of the boom, and the rollers are in rolling contact with the outer side of another boom installed in the boom.

[0006] Furthermore, the rollers are installed with rotation across the width of the boom.

[0007] Furthermore, it also includes triangular plates, welding plate pins, and bearings. The triangular plates are symmetrically fixedly installed on both sides of the boom head and boom tail. The rollers are rotatably installed between the two triangular plates through the welding plate pins. The bearings are located at both ends of the rollers and are fixedly installed between the rollers and the welding plate pins.

[0008] Furthermore, a large hinge point hole is made in the triangle plate. The triangle plate is symmetrically fixed to the inner sides of the boom head and boom tail by passing the large hinge point hole through the pin, inserting the positioning pin into the pin, and bolting the positioning pin to the boom.

[0009] Furthermore, the triangle plate has two small hinge point holes, and the roller is installed between the two triangle plates by passing through the small hinge point holes with the welding plate pin shaft and connecting the welding plate pin shaft to the triangle plate with screws.

[0010] Furthermore, a ramp is created on the rolling surface of the roller.

[0011] Furthermore, a circular end face is provided on the side of the large hinge point hole away from the roller, and the circular end face is higher than the welding plate end face of the welding plate pin.

[0012] Furthermore, a lubrication channel is opened inside the welding plate pin shaft, the oil outlet of the lubrication channel is connected to the inside of the bearing, and an oil nozzle is installed at the oil inlet of the lubrication channel.

[0013] Furthermore, the rollers are made of MC nylon. Beneficial effects

[0014] 1. This invention uses rollers that are rotated and installed on the inner side of the boom head and boom tail of the boom. The rollers roll in contact with the outer side of another boom installed in the boom, thereby achieving rolling friction between the boom and the slider. This greatly improves the service life of the rolling slider, thereby reducing maintenance costs, reducing resistance between booms, and making the boom operation more stable and smooth.

[0015] 2. The present invention adopts a roller assembly structure that spans the entire width of the boom, which effectively prevents impurities from entering the boom and achieves line contact between the boom and the roller, resulting in a more uniform contact area and more uniform force distribution.

[0016] 3. The present invention uses a double roller assembly to achieve dynamic and real-time contact between the double rollers and the boom, thereby achieving dynamic balance and better supporting the smooth operation of the boom.

[0017] 4. The welding plate pin and the triangular plate of the roller assembly of the present invention are fixed with double screws to avoid relative rotation between the metal of the welding plate pin and the small hinge hole of the triangular plate, thus extending the service life.

[0018] 5. In this invention, the welding plate pin and the lubrication-free bearing form a rotating pair, avoiding roller wear caused by direct contact between the welding plate pin and the roller.

[0019] 6. The invention adds an oil groove structure to the welding plate pin shaft, which extends the relative rotational life of the welding plate pin shaft and the lubrication-free bearing, thereby reducing maintenance costs.

[0020] 7. This invention uses a double rolling slider made of MC nylon to replace the ultra-high molecular weight polyethylene cuboid slider, which greatly reduces material costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the working structure of a rolling slider for a telescopic boom provided in an embodiment of the present invention; Figure 2 This is an exploded structural diagram of the rolling assembly in the rolling slider of a telescopic boom provided in an embodiment of the present invention; Figure 3 This is a front view schematic diagram of the triangular plate in the rolling slider of a telescopic boom provided in an embodiment of the present invention; Figure 4 This is a side view of the triangular plate in the rolling slider of a telescopic boom provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the roller in the rolling slider of a telescopic boom provided in an embodiment of the present invention; Figure 6 yes Figure 5 Sectional view of BB; Figure 7 This is a top view of the rolling assembly in a rolling slider for a telescopic boom, provided in an embodiment of the present invention. Figure 8 This is a schematic diagram of the internal structure of the welding plate pin in the rolling slider of a telescopic boom provided in an embodiment of the present invention; In the diagram: 1. Outer arm; 2. Oil nozzle; 3. Bolt; 4. Locating pin; 5. Roller assembly; 6. Inner arm; 7. Pin; 5-1. Screw; 5-2. Welding plate pin; 5-3. Lubrication-free bearing; 5-4. Roller; 5-5. Triangle plate; 5-5-1. Small hinge hole; 5-5-2. Large hinge hole; 5-5-3. Circular end face; 5-5-4. Threaded hole; 5-4-1. Large outer diameter; 5-4-2. Ramp; 5-4-3. Small outer diameter; 5-4-4. Countersunk hole; 5-4-5. Inner hole; 5-2-1. Oil inlet threaded hole; 5-2-2. Oil groove; 5-2-3. Oil outlet; 5-2-4. Screw countersunk hole; 5-2-5. Welding plate end face. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention. Example 1

[0023] like Figures 1 to 8 As shown, this embodiment provides a rolling slider for a telescopic boom, including rollers. Several rollers are arranged and rotatably mounted on the inner sides of the boom head and tail. The rollers also roll in contact with the outer side of another boom within the same boom assembly, achieving rolling friction between the boom and the slider. This significantly improves the service life of the rolling slider, thereby reducing maintenance costs, decreasing resistance between booms, and resulting in smoother and more stable boom operation. The rollers are installed rotating across the width of the boom, employing a roller assembly structure spanning the entire boom width. This effectively prevents impurities from entering the boom's interior and ensures line contact between the boom and the rollers, resulting in a more uniform contact area and force distribution. The rolling slider for the telescopic boom also includes triangular plates, welded pins, and lubrication-free bearings. The triangular plates are symmetrically fixed on both sides of the boom's head and tail. The rollers are rotatably mounted between the two triangular plates via the welded pins. The lubrication-free bearings are located at both ends of the rollers and fixed between the rollers and the welded pins. The welded pins and lubrication-free bearings form a rotating pair, preventing roller wear caused by direct contact between the welded pins and the rollers. A large hinge hole is provided in the triangular plate. The triangular plate is symmetrically fixed on both sides of the boom's head and tail by a pin passing through the large hinge hole, a locating pin inserted into the pin, and bolts connecting the locating pin to the boom. Two small hinge holes are provided in the triangular plate. Rollers are mounted between the two triangular plates by passing through these small hinge holes and connected to the welding plate pin with screws. This dual-roller assembly ensures dynamic, real-time contact between the two rollers and the boom, achieving dynamic balance and better supporting the smoothness of boom operation. The welding plate pin and triangular plate of the roller assembly are fixed with double screws to prevent relative rotation between the metal parts of the welding plate pin and the small hinge holes, extending service life. A ramp is provided on the rolling surface of the rollers. A circular end face is provided on the side of the large hinge hole away from the roller, higher than the welding plate end face of the welding plate pin. A lubrication channel is provided inside the welding plate pin, with the oil outlet connecting to the bearing interior and an oil nozzle at the inlet. The addition of an oil groove structure (lubrication channel) to the welding plate pin extends the relative rotational life between the welding plate pin and the lubrication-free bearing, thereby reducing maintenance costs. The rollers are made of MC nylon, and the use of double rolling sliders made of MC nylon instead of ultra-high molecular weight polyethylene cuboid sliders greatly reduces material costs. Example 2

[0024] like Figures 1 to 8As shown, this embodiment provides a rolling slider for a telescopic boom. Rolling sliders are installed at the boom head and tail of each boom section. The roller assembly 5 in the rolling slider is connected to the boom head / tail hinge point of the outer boom 1 via a pin 7. To ensure smoother operation of the inner boom 6 on the outer boom 1, the roller assembly 5 uses a triangular plate 5-5 that can achieve dynamic balance. Each triangular plate 5-5 has two small hinge point holes 5-5-1 and one large hinge point hole 5-5-2. The two small hinge point holes 5-5-1 are on the same horizontal line to achieve dynamic contact between the double rollers and the boom. The roller 5-4 is installed between the two triangular plates 5-5 via a welding plate pin 5-2. To avoid the inner hole of the roller 5-4... The direct contact between roller 5-4-5 and the shaft surface of welding plate pin 5-2 causes wear on the inner hole 5-4-5 of the roller. Therefore, the diameter of the inner hole 5-4-5 of roller 5-4 needs to be slightly larger than the diameter of welding plate pin 5-2. Simultaneously, countersunk holes 5-4-4, with the same length as the lubrication-free bearing 5-3, are machined at both ends of roller 5-4. The diameter of the countersunk holes 5-4-4 forms an interference fit with the lubrication-free bearing 5-3. To make the relative rotation between roller 5-4 and welding plate pin 5-2 smoother, a lubrication channel is added to welding plate pin 5-2, with the oil outlet 5-2-3 of welding plate pin 5-2 located inside the lubrication-free bearing 5-3. To ensure more reasonable force distribution at the contact area between the inner arm 6 and the head of the outer arm 1, roller 5-4 is designed with an oblique... Slope 5-4-2, with a 3-degree inclination angle, is mainly to ensure a gradual change in the cross-section of roller 5-4 and a uniform force distribution on the inner arm 6. The difference between the large outer diameter 5-4-1 and the small outer diameter 5-4-3 of roller 5-4 should not be too large. Roller 5-4 and inner arm 6 experience relative rolling friction. To prevent roller 5-4 from rotating while the welding plate pin 5-2 also rotates around the small hinge hole 5-5-1 of triangle 5-5, two countersunk holes 5-2-4 are machined on the welding plate of welding plate pin 5-2, and screws 5-1 are used to fix it to the threaded hole 5-5-4 of triangle 5-5. To avoid the welding plate end face 5-2-5 of the welding plate pin 5-2 of roller assembly 5 from contacting the outer arm 1... The inner surface friction causes damage. The annular end face 5-5-3 of the triangular plate 5-5 will be higher than the welding plate end face 5-2-5 of the welding plate pin 5-2. In this way, the annular end face 5-5-3 of the triangular plate 5-5 will first contact the inner surface of the outer arm 1, and will no longer damage the welding plate end face 5-2-5 of the welding plate pin 5-2. Insert the positioning pin 4 into the positioning hole of the pin 7, and fix the bolt 3 through the pin hole of the positioning pin 7 to the outer arm 1. Inject grease into the oil inlet thread hole 5-2-1 of the welding plate pin 5-2, and screw on the grease nipple 2. Under the drive of the telescopic system, the telescopic boom telescopically extends and retracts in multiple stages to reach different working heights. Each section of the boom achieves relative rolling friction through the roller assembly 5 at the boom head / tail.

[0025] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A rolling slider for a telescopic boom, characterized in that, It includes rollers, with several rollers installed on the inner side of the boom head and boom tail, and the rollers making rolling contact with the outer side of another boom within the boom where they are installed.

2. The rolling slider for a telescopic boom according to claim 1, characterized in that, The rollers are installed with rotation across the width of the boom.

3. The rolling slider for a telescopic boom according to claim 1, characterized in that, It also includes triangular plates, welding plate pins and bearings. The triangular plates are symmetrically fixedly installed on both sides of the boom head and boom tail. The rollers are rotatably installed between the two triangular plates through the welding plate pins. The bearings are located at both ends of the rollers and are fixedly installed between the rollers and the welding plate pins.

4. The rolling slider for a telescopic boom according to claim 3, characterized in that, A large hinge point hole is made in the triangle plate. The triangle plate is symmetrically fixed to the inner sides of the boom head and boom tail by passing the large hinge point hole through the pin, inserting the positioning pin, and bolting the positioning pin to the boom.

5. The rolling slider for a telescopic boom according to claim 3, characterized in that, The triangle has two small hinge holes. The roller is installed between the two triangles by passing through the small hinge holes with a welding plate pin and connecting the welding plate pin to the triangle with a screw.

6. The rolling slider for a telescopic boom according to claim 1, characterized in that, A ramp is made on the rolling surface of the roller.

7. The rolling slider for a telescopic boom according to claim 4, characterized in that, A circular end face is provided on the side of the large hinge point hole away from the roller, and the circular end face is higher than the end face of the welding plate pin.

8. The rolling slider for a telescopic boom according to claim 3, characterized in that, A lubrication channel is opened inside the welding plate pin shaft. The oil outlet of the lubrication channel is connected to the inside of the bearing, and an oil nozzle is installed at the oil inlet of the lubrication channel.

9. The rolling slider for a telescopic boom according to claim 1, characterized in that, The rollers are made of MC nylon.

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