Side sliding block assembly of crane boom body

Abstract

The utility model discloses a side sliding block assembly of a crane boom body and belongs to the technical field of telescopic booms of engineering machinery. The side sliding block is characterized in that the internal thread stud comprises a cylindrical large-diameter part and a cylindrical small-diameter part, the small-diameter part is provided with an internal thread hole, and the large-diameter part is provided with a cylindrical inner cavity matched with the side sliding block. The external thread stud is cylindrical, external threads are arranged on the outer wall of the external thread stud, the outer wall of the large-diameter part of the external thread stud is welded with the side plate of the previous section of the arm body, and the external thread stud is connected to the small-diameter part of the internal thread stud and is screwed through the threads, so that the inner side end face of the external thread stud abuts against the outer side end face of the side sliding block. According to the utility model, the problem that the contact surface of the side sliding block is limited in the conventional design is solved, the outer diameter of the side sliding block can be freely increased according to the actual requirement under the condition that the internal thread and the external thread are kept unchanged, the purpose of increasing the contact area is achieved, the requirement of larger side load can be met, and the design requirement under the working condition of high-altitude lifting in hurricane weather can be met.

Description

Technical Field

[0001] This utility model relates to a side slider assembly of a crane boom, belonging to the field of telescopic boom technology for engineering machinery. Background Art

[0002] like Figure 1 As shown, the boom of a conventional lifting device bears a large load in the vertical direction, but theoretically no load in the horizontal direction. Therefore, the function of the side slider is only to adjust the gap between the boom sections and ensure that the boom is centered. Figure 2 As shown, the adjustment function of the conventionally designed side slider assembly is implemented as follows:

[0003] a) First, fix the internal threaded stud 1 to the side plate of the previous arm section 5 by welding;

[0004] b) Insert the rear arm section 6 into the front arm section;

[0005] c) Insert the nylon side slider 7 into the mounting hole on the right end face of the external threaded stud 3;

[0006] d) such as Figure 3 As shown, use an Allen wrench to insert into the hexagonal hole on the left end face of the external threaded stud, and tighten the thread to make the nylon side slider contact the side plate of the rear arm section.

[0007] e) Adjust the side sliders on both sides of the previous section of the arm body by threading to center the arm body;

[0008] f) Then screw the standard nut 2 into the external threaded post and tighten it.

[0009] However, the conventionally designed side slider assembly described above has certain limitations:

[0010] 1) The national standard nut 2 here has anti-loosening requirements after tightening, so only the fine thread of the type 1 non-metallic insert hexagonal lock nut can be selected. According to GB / T889.2, the maximum thread specification is M36*3, and its bottom hole diameter is about 33mm.

[0011] 2) If the maximum outer diameter of the side slider is greater than 32mm, the side slider cannot be assembled from the side of the arm body using an internally threaded stud. Figure 4 As shown, it can only be assembled from inside the arm body and then adjusted via threads;

[0012] 3) The gap between the arm bodies may have some tolerance fluctuation due to welding and other reasons. To facilitate assembly, such as... Figure 5 As shown, the thickness of the side slider will be reduced, and in addition, there will be gaps between the side slider and the arm body under this structure, which poses a risk of damage when subjected to lateral forces.

[0013] In summary, in the conventionally designed side slider assembly, the maximum contact surface diameter between the nylon side slider and the rear boom section is 32mm. This contact area can meet the design requirements of the boom side slider without large side load requirements, but it cannot meet the design requirements under high-altitude lifting conditions during hurricane weather. Utility Model Content

[0014] The purpose of this utility model is to address the shortcomings of the existing technology by providing a side slider assembly for a crane boom. While meeting the requirements for preventing loosening, the outer diameter and thickness of the side slider can be freely selected according to actual needs, which can meet the requirements for large side loads and the design requirements for high-altitude lifting operations during hurricane weather.

[0015] The technical solution of this utility model is as follows: A side slider assembly for a crane boom, characterized in that it includes a cylindrical side slider, an internally threaded stud, and an externally threaded stud. The internally threaded stud includes a cylindrical large-diameter portion and a cylindrical small-diameter portion, with a stepped surface formed at the intersection of the large-diameter portion and the small-diameter portion. The small-diameter portion is provided with an internally threaded hole, and the large-diameter portion is provided with a cylindrical inner cavity that matches the side slider. The internally threaded hole and the cylindrical inner cavity form a through hole for the internally threaded stud. The externally threaded stud is cylindrical, with external threads on its outer wall. The outer wall of the large-diameter portion is welded to the side plate of the previous boom section. The side slider is installed in the cylindrical inner cavity of the internally threaded stud, and the externally threaded stud is connected to the small-diameter portion of the internally threaded stud. By tightening the threads, the inner end face of the externally threaded stud abuts against the outer end face of the side slider.

[0016] In the above scheme, the side slider is made of nylon and adopts a cylindrical design with a consistent outer diameter, which can evenly distribute pressure, increase compressive strength, and improve the stability of the overall structure. The internal threaded stud is designed to form a stepped shape, and its large diameter can vary with the outer diameter of the side slider according to design requirements. The internal threaded hole and external threaded stud of its small diameter can be selected with appropriate fine threads according to design requirements.

[0017] Furthermore, both ends of the side slider are provided with rounded chamfers, and the cylindrical inner cavity of the large diameter part of the internal thread stud also adopts a matching rounded chamfer, which can reduce stress concentration at sharp corners, prevent mechanical performance degradation, and meet the requirements of larger side loads.

[0018] Furthermore, the outer end face of the external threaded stud is provided with a cross-shaped groove. This structure is not limited to cooperating with cross screwdrivers and flathead screwdrivers, but can also be used with plate-shaped, strip-shaped or other objects that are readily available, all of which can be embedded in the cross-shaped groove for thread rotation.

[0019] Furthermore, a locking nut and a hexagonal head bolt are also provided; the small diameter portion of the internally threaded stud has multiple uniformly and symmetrically arranged through holes on its side wall; the hexagonal head bolt is fitted with a spring washer, passes through a pair of through holes and a cross-shaped groove, and is locked by the locking nut.

[0020] In the above scheme, the hexagonal head bolts adopt the national standard hexagonal head bolt fine thread, the spring washers adopt the national standard spring washers, and the lock nut adopts the national standard type 1 non-metallic insert hexagonal lock nut fine thread, which can meet the anti-loosening requirements. The internal thread stud has a pair of through holes in the small diameter section, and the outer end of the cross-shaped groove on the external thread stud is designed with an open end so that the hexagonal head bolt can pass through the through hole and the cross-shaped groove.

[0021] Conventional side-slider assemblies rely on locking the side slider with a lock nut tightened onto the externally threaded studs. This requires a fine-threaded fit between the studs, limiting the selection of lock nuts and making them not unique. In this invention, the externally threaded studs have a cross-shaped groove, and the internally threaded studs have paired through holes. The lock nut can be a smaller M8*1 type, and a hexagonal head bolt with fine threads secures both the internal and externally threaded studs. This design not only strengthens the connection between the internal and externally threaded studs, preventing axial slippage of the externally threaded studs, but also prevents circumferential rotation of the externally threaded studs, thus achieving the purpose of fixing the side slider.

[0022] Furthermore, the outer diameter of the shank end of the hexagonal head bolt matches the width of the cross-shaped groove to prevent the hexagonal head bolt from wobbling within the cross-shaped groove, and further prevent the external thread stud from rotating circumferentially.

[0023] Furthermore, the outer diameter of the side slider is greater than the outer diameter of the external threaded stud, the height of the side slider is greater than or equal to the depth of the cylindrical inner cavity, and the length of the external threaded stud is greater than the depth of the small-diameter internal threaded hole.

[0024] This invention solves the problem of limited contact surface of the side slider in conventional design. It can increase the outer diameter of the side slider freely according to actual needs while keeping the internal and external threads unchanged, thereby increasing the contact area. It can meet the requirements of larger side loads and design requirements under high-altitude lifting conditions in hurricane weather. Attached Figure Description

[0025] Figure 1 This is a schematic diagram illustrating the usage state of the side slider assembly in the background art;

[0026] Figure 2 for Figure 1 Schematic diagram of the middle slider assembly;

[0027] Figure 3 The background diagram shows the side slider being assembled from the side of the arm body (the diameter of the side slider is less than 32mm).

[0028] Figure 4 The background diagram shows the side slider being assembled from inside the arm body (the side slider diameter is greater than 32mm).

[0029] Figure 5 This is a schematic diagram of the assembly after the side slider thickness is reduced in the background art (the side slider diameter is greater than 32mm).

[0030] Figure 6 This is a schematic diagram showing the usage state of the crane boom side slider assembly of this utility model;

[0031] Figure 7 This is a schematic diagram of the structure of the crane boom side slider assembly of this utility model;

[0032] Figure 8 This is an assembly drawing of the side slider assembly of the crane boom of this utility model;

[0033] Figure 9 This is a cross-sectional view of the internally threaded stud in the side slider assembly of the crane boom of this utility model;

[0034] Figure 10 for Figure 9 Sectional view along line AA;

[0035] Figure 11 This is a schematic diagram of the external threaded stud in the side slider assembly of the crane boom of this utility model;

[0036] Figure 12 Encirclement Figure 11 Side view;

[0037] In the diagram: 1. Internal threaded stud, 2. Locking nut, 3. External threaded stud, 4. Weld, 5. Front section of boom, 6. Rear section of boom, 7. Side slider; 8. Hex head bolt, 9. Spring washer, 10. External threaded stud, 11. Locking nut, 12. Front section of boom, 13. Weld, 14. Side slider, 15. Internal threaded stud, 16. Rear section of boom, 17. Through hole, 18. Cross-shaped groove, 19. Large diameter section, 20. Small diameter section. DETAILED DESCRIPTION

[0038] A crane boom side slider assembly, such as Figure 7 As shown, the device includes a cylindrical nylon side slider 14, an internally threaded stud 15, an externally threaded stud 10, a lock nut 11, a hexagonal head bolt 8, and a spring washer 9. The internally threaded stud consists of a cylindrical large-diameter portion 19 and a cylindrical small-diameter portion 20. A stepped surface is formed at the intersection of the large and small diameter portions. The small-diameter portion has an internally threaded hole, and the large-diameter portion has a cylindrical inner cavity that matches the side slider. The internally threaded hole and the cylindrical inner cavity form a through hole for the internally threaded stud. The externally threaded stud is cylindrical, and its outer wall has external threads.

[0039] The major diameter of the internally threaded stud can vary according to the outer diameter of the side slider, depending on the design requirements. The outer wall of the major diameter is welded to the side plate of the previous arm 12. The side slider 14 is installed in the cylindrical inner cavity of the internally threaded stud. The externally threaded stud 10 is connected to the minor diameter of the internally threaded stud 15. By tightening the threads, the inner end face of the externally threaded stud abuts against the outer end face of the side slider, while the inner end face of the side slider contacts the next arm 16.

[0040] The outer end face of the externally threaded stud 10 is provided with a cross-shaped groove 18, such as... Figure 11 , Figure 12 As shown, it can be used with Phillips screwdrivers, flathead screwdrivers, or plate-shaped or strip-shaped objects to screw threads.

[0041] The minor diameter portion 20 of the internally threaded stud, such as Figure 9 , Figure 10 As shown, its sidewall is provided with multiple uniformly and symmetrically arranged through holes 17; the spring washer is fitted on the hexagonal head bolt, the hexagonal head bolt adopts the national standard hexagonal head bolt fine thread, the spring washer adopts the national standard spring washer, the locking nut adopts the national standard type 1 non-metallic insert hexagonal locking nut fine thread, the hexagonal head bolt passes through a pair of through holes and a cross-shaped groove, and is locked by the locking nut to fix the side slider.

[0042] In one embodiment of this utility model, the outer diameter of the shank end of the hexagonal head bolt matches the width of the cross-shaped groove, further preventing the hexagonal head bolt from rotating circumferentially.

[0043] In one embodiment of this utility model, the edges of both ends of the side slider are provided with rounded chamfers, and the cylindrical inner cavity of the large diameter part of the internal thread stud also adopts a matching rounded chamfer to reduce stress concentration.

[0044] In one embodiment of this utility model, the outer diameter of the side slider is greater than the outer diameter of the external threaded stud, the height of the side slider is greater than or equal to the depth of the cylindrical inner cavity, and the length of the external threaded stud is greater than the depth of the small-diameter internal threaded hole.

[0045] like Figure 6 , Figure 7 , Figure 8 As shown, the adjustment function of the side slider 14 is implemented as follows:

[0046] a) First, fix the internal threaded stud 15 to the side plate of the previous arm 12 by welding;

[0047] b) Insert the nylon side slider 14 from inside the previous arm body 12 into the cylindrical cavity at the right end (large diameter part) of the internal threaded stud 15;

[0048] c) Insert the rear arm section 16 into the front arm section 12;

[0049] d) Insert the external threaded stud 10 into the internal threaded hole on the left end (small diameter part) of the internal threaded stud; tighten the external threaded stud 10 so that the nylon side slider 14 contacts the side plate of the next arm 16.

[0050] e) Adjust the side sliders 14 on both sides of the front section arm 12 by threading to make the rear section arm 16 centered.

[0051] f) Use national standard hexagonal head bolts with fine threads, national standard spring washers, and national standard type 1 non-metallic insert hexagonal lock nuts with fine threads. Through the through hole (through hole) of the internal threaded stud, prevent the external threaded stud from rotating circumferentially and lock the external threaded stud.

Claims

1. A crane boom side slider assembly, characterized in that it comprises: The side slider is cylindrical. The internally threaded stud includes a cylindrical large-diameter portion and a cylindrical small-diameter portion; the small-diameter portion is provided with an internally threaded hole, and the large-diameter portion is provided with a cylindrical inner cavity that matches the side slider. The internally threaded hole and the cylindrical inner cavity form a through hole for the internally threaded stud; the outer wall of the large-diameter portion is welded to the side plate of the previous arm section. The external threaded stud is cylindrical in shape and has external threads on its outer wall. It is connected to the small diameter part of the internal threaded stud, and its inner end face abuts against the outer end face of the side slider.

2. The crane boom side slider assembly according to claim 1, characterized in that, Both ends of the side slider have rounded chamfers at their edges.

3. The crane boom side slider assembly according to claim 1, characterized in that, The outer end face of the external threaded stud is provided with a cross-shaped groove.

4. A crane boom side slider assembly according to claim 3, characterized in that, It also includes lock nuts and hexagonal head bolts; The small-diameter portion of the internally threaded stud has multiple uniformly and symmetrically arranged through holes on its sidewall. The hexagonal head bolt passes through a pair of through holes and a cross-shaped slot, and is locked in place by a lock nut.

5. A crane boom side slider assembly according to claim 4, characterized in that, A spring washer is fitted onto the hexagonal head bolt.

6. A crane boom side slider assembly according to claim 1 or 4, characterized in that, The outer diameter of the side slider is greater than the outer diameter of the external threaded stud, and the thickness of the side slider is greater than or equal to the depth of the cylindrical inner cavity.

7. A crane boom side slider assembly according to claim 6, characterized in that, The length of the external threaded stud is greater than the depth of the small-diameter internal threaded hole.

8. A crane boom side slider assembly according to claim 4, characterized in that, The outer diameter of the shank end of the hexagonal head bolt matches the width of the cross-shaped groove.

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