Side door limiting structure for engineering machinery
By improving the side door limiting structure and adopting the design of limiting plates, limiting sleeves, washers and other components, the problems of complex manufacturing, poor wear resistance and unsmooth movement in the existing technology have been solved, and a simple, reliable automatic limiting and low-cost side door limiting effect has been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-17
- Publication Date
- 2026-03-06
AI Technical Summary
Existing side door limiting devices suffer from problems such as complex manufacturing processes, poor wear resistance, unsmooth movement, and high costs.
The system uses a combination of a limiting plate, a limiting sleeve, and a limiting pad to achieve automatic positioning through gravity. The design of the slide and limiting hole simplifies the manufacturing process, and the use of wear-resistant washers and limiting pads ensures smooth movement.
It achieves automatic limit function with simple structure and convenient assembly, reduces manufacturing cost, improves smoothness and reliability of movement, and reduces wear of parts.
Smart Images
Figure CN223975013U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of side door limiting technology, and more specifically, to a side door limiting structure for engineering machinery. Background Technology
[0002] Side doors are an important structural component of construction machinery, serving not only a protective function but also facilitating the maintenance and repair of equipment inside the machinery. Since side doors need to be opened and closed frequently, they must be secured by limiting devices after opening to prevent injury to maintenance personnel from shaking due to external forces such as wind during maintenance.
[0003] The grooved limiting plate is widely used in existing side door limiting devices. Combined with cotter pins, bosses, pins, and connecting seats, it can achieve limiting. The end of the grooving of the limiting plate has a stepped limiting groove. When the side door is opened, the pin can slide in the grooving; when the pin moves to the front of the grooving, it gets stuck in the limiting groove, thus preventing the limiting plate from moving and achieving the limiting function. This structure has the following disadvantages: the grooving of the limiting plate has a stepped limiting groove at the end, instead of a through hole, making the manufacturing process complex; the limiting plate directly contacts the boss and connecting seat during sliding, and the boss and connecting seat have poor wear resistance, easily wearing away the paint on the surface of the parts; the straight grooving makes movement uneven during side door rotation; the manufacturing process of the cotter pin and pin is complex and costly, and the cotter pin installation requires high precision, making it prone to loosening and failure due to improper manual operation. Utility Model Content
[0004] The purpose of this utility model is to provide a side door limiting structure for engineering machinery, which is simple in structure and easy to assemble, while achieving automatic limiting, smooth movement, and improved reliability.
[0005] This utility model is achieved through the following technical solution:
[0006] A side door limiting structure for engineering machinery includes a side door and a frame. A fixed bracket is provided on the side door, and a limiting bracket is provided on the frame. A limiting plate is hinged to the fixed bracket, and a slide rail is provided on the limiting plate. A limiting hole is provided at one end of the slide rail. A limiting bolt is provided in the slide rail, and a limiting sleeve II is provided on the limiting bolt. The bottom end of the limiting sleeve II is connected to a limiting pad, and a washer III is connected to the top end of the limiting sleeve II. The limiting bolt fixes the washer III, the limiting sleeve II, and the limiting pad to the limiting bracket. The limiting hole cooperates with the limiting pad to limit movement.
[0007] Furthermore, the slide rail is provided with multiple limiting holes.
[0008] Furthermore, the diameter of the limiting hole is larger than the diameter of the limiting pad, and the diameter of the limiting pad is larger than the diameter of the limiting sleeve II; the distance between the washer III and the limiting pad is larger than the thickness of the limiting plate.
[0009] Furthermore, the limiting plate is provided with mounting holes, and the limiting plate is hinged to the fixed bracket by fixing bolts; the screw of the fixing bolt is provided with a limiting sleeve I, and the upper and lower ends of the limiting sleeve I are respectively provided with washers I and II, and the fixing bolts fix washers I, washers II and limiting sleeve I to the fixed bracket.
[0010] Furthermore, the distance between washer I and washer II is greater than the thickness of the limiting plate.
[0011] Furthermore, the materials of washer I, washer II, washer III, and limiting pad are metal or nylon.
[0012] Furthermore, the limiting pad is shaped like a frustum.
[0013] Furthermore, both the side surface of the limiting plate and the side surface of the slide are curved.
[0014] Compared with the prior art, the beneficial effects of this utility model are:
[0015] 1. This utility model provides a side door limiting structure with a limiting plate featuring mounting holes, a sliding track, and limiting holes. In conjunction with components such as the limiting sleeve II and the limiting pad, it enables automatic limiting of the side door opening. After the side door opens to a certain angle, the limiting plate automatically falls into the limiting pad under gravity, effectively limiting the side door opening in both directions. The structure is simple and reliable, with low manufacturing costs, and is easy to assemble and disassemble.
[0016] 2. In this utility model, the side of the limiting plate and the side of the slide are curved, which makes the slide move more smoothly during the opening and closing of the side door. The curved side structure is more compact and can save installation space. The limiting hole is a through hole structure, which is simpler to manufacture than a stepped hole.
[0017] 3. During the sliding process of the limiting plate along the slide rail, the bottom surface of the limiting plate contacts the wear-resistant washer I and the upper surface of the limiting pad, without damaging the paint on the support surface. The limiting pad has a frustum-shaped structure, which facilitates the limiting hole falling into the limiting pad. Furthermore, during the sliding process of the limiting plate along the slide rail, the bottom surface of the limiting plate, washer I, and the upper surface of the limiting pad are in the same plane, resulting in smooth movement. Attached Figure Description
[0018] Figure 1 This is a cross-sectional schematic diagram of the side door limiting structure of this utility model;
[0019] Figure 2This is a three-dimensional schematic diagram of the side door limiting structure of this utility model;
[0020] Figure 3 This is a schematic diagram of the limiting plate structure of this utility model;
[0021] Figure 4 This is a schematic diagram of the limiting pad structure of this utility model;
[0022] Figure 5 This is a schematic diagram illustrating the application of the side door limiting structure of this utility model;
[0023] Figure 6 This is a schematic diagram of the side door closing state limiting structure of this utility model;
[0024] Figure 7 This is a schematic diagram of the double-hole limiting plate structure of this utility model.
[0025] In the diagram: 1. Fixed bracket; 2. Fixed bolt; 3. Washer I; 4. Limit sleeve I; 5. Washer II; 6. Nut I; 7. Limiting plate; 71. Mounting hole; 72. Slide rail; 73. Limiting hole; 8. Washer III; 9. Limiting bolt; 10. Limiting sleeve II; 11. Limiting pad; 12. Nut II; 13. Limiting bracket; 14. Side door; 15. Frame. Detailed Implementation
[0026] To enable those skilled in the art to better understand the technical solution of this utility model, the technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Based on the embodiments in this application, other similar embodiments obtained by those skilled in the art without creative effort should all fall within the scope of protection of this application. Furthermore, the directional terms mentioned in the following embodiments, such as "up," "down," "left," and "right," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the creation of this utility model.
[0027] The present invention will be further described below with reference to the accompanying drawings.
[0028] Example 1: A side door limiting structure for engineering machinery, such as... Figures 1-7 As shown, the vehicle includes a side door 14 and a frame. A fixed bracket 1 is provided on the side door 14, and a limiting bracket 13 is provided on the frame 15. A limiting plate 7 is hinged to the fixed bracket 1. Figure 3As shown, the limiting plate 7 is provided with a slide rail 72, and one end of the slide rail 72 is provided with a limiting hole 73. The slide rail 72 and the limiting hole 73 are connected, and the limiting hole 73 is a through hole. A limiting bolt 9 is provided in the slide rail 72, and a limiting sleeve II 10 is provided on the limiting bolt 9. The bottom end of the limiting sleeve II 10 is connected to the limiting pad 11, and the top end of the limiting sleeve II 10 is connected to the washer III 8. The limiting bolt 9 fixes the washer III 8, the limiting sleeve II 10 and the limiting pad 11 to the limiting bracket 13. The limiting hole 73 cooperates with the limiting pad 11 to limit the movement. Through the cooperation of the limiting bracket 13, the fixed bracket 1, the limiting plate 7, the slide rail 72, the limiting hole 73 and the limiting bolt 9, the limiting function of the side door 14 is realized. The overall structure is simple, easy to manufacture and install, and the limiting effect is reliable, which can effectively prevent the side door 14 from moving or shaking unexpectedly during the operation of engineering machinery.
[0029] Example 2: A side door limiting structure for engineering machinery, wherein the slide 72 is provided with two limiting holes 73; a second limiting hole 73 is added to the limiting plate 7, such as... Figure 7 As shown, the two limiting holes 73 can satisfy the limiting of the two opening angles of the side door 14. Switching between the two limiting holes 73 only requires manually lifting the limiting hole 73 part of the limiting plate 7 to disengage the limiting hole 73 from the limiting pad 11, making switching convenient. The slide rail 72 is provided with two limiting holes 73, providing multi-level limiting functions and increasing the flexibility of use. The number of limiting holes 73 can be added according to the working conditions.
[0030] The diameter of the limiting hole 73 is larger than the diameter of the limiting pad 11, and the diameter of the limiting pad 11 is larger than the diameter of the limiting sleeve II 10; the distance between the washer III 8 and the limiting pad 11 is greater than the thickness of the limiting plate 7; the distance between the two sides of the slide 72 is larger than the diameter of the limiting sleeve II 10, but the distance between the two sides of the slide 72 is smaller than the maximum diameter of the limiting pad 11; the diameter of the limiting hole 73 is larger than the distance between the two sides of the slide 72.
[0031] The limiting plate 7 is provided with mounting holes 71. The limiting plate 7 is hinged to the fixed bracket 1 by the fixing bolt 2. The screw of the fixing bolt 2 is provided with a limiting sleeve I4. The upper and lower ends of the limiting sleeve I4 are respectively provided with washers I3 and II5. The fixing bolt 2 fixes the washers I3, II5 and the limiting sleeve I4 to the fixed bracket 1.
[0032] The gap between washer I3 and washer II5 is greater than the thickness of the limiting plate 7, so that the limiting plate 7 can move up and down between washer I3 and washer II5.
[0033] Washers I3, II5, III8, and limiting pad 11 are made of metal or nylon. Nylon has self-lubricating and wear-resistant properties, which can further reduce friction and noise, while metal provides higher strength and durability. The appropriate material can be selected according to actual needs, which increases the applicability and economy of the structure.
[0034] like Figure 4 As shown, the limiting pad 11 is shaped like a frustum, which makes it easy for the limiting hole 73 to fall into the limiting pad 11.
[0035] Both the side surfaces of the limiting plate 7 and the side surfaces of the slide rail 72 are curved, which can better adapt to the movement trajectory of the side door 14, reduce the shaking of the side door 14 during movement, enhance the stability of the structure, and save installation space. The limiting hole 73 is a through hole structure, which is simpler to manufacture than a stepped hole. Everything else is the same as in Embodiment 1.
[0036] During assembly, first place washer II5 on the upper part of the fixed bracket 1, and then place the limiting sleeve I4 on top of washer II5. The diameter of the mounting hole 71 of the limiting plate 7 is larger than the diameter of the limiting sleeve I4, so the limiting sleeve I4 can be fitted inside. Then, place washer I3 on top of the limiting sleeve I4. The fixing bolt 2 passes through washer I3, limiting sleeve I4, and washer II5 in sequence, and is then fixed to the fixed bracket 1 by nut I6. The left end of the limiting plate 7 is restricted to the limiting sleeve I4 through the mounting hole 71, and can rotate around the limiting sleeve I4. The thickness of the limiting plate 7 is less than the distance between washer I3 and washer II5, so it can also move up and down between washer I3 and washer II5.
[0037] The right end of the limiting plate 7 is mounted on the limiting bracket 13 via washer III8, limiting bolt 9, limiting sleeve II10, limiting pad 11, and nut II12. During assembly, the limiting pad 11 is first placed on the upper part of the limiting bracket 13, and the limiting sleeve II10 is placed on the upper part of the limiting pad 11. The diameter of the limiting hole 73 of the limiting plate 7 is larger than the diameters of the limiting sleeve II10 and the limiting pad 11, so it can be fitted into the limiting pad 11. Then, washer III8 is placed on the upper part of the limiting sleeve II10, and then the limiting bolt 9 is passed through washer III8, limiting sleeve II10, and limiting pad 11 in sequence, and then fixed on the limiting bracket 13 by nut II12.
[0038] When side door 14 is closed, such as Figure 6As shown, the slide rail 72 of the limiting plate 7 is fitted onto the limiting sleeve II 10. The lower surface of the limiting plate 7 contacts the upper surface of the limiting pad 11, and the upper surface of the limiting pad 11 is horizontal with the upper surface of the washer II 5, so that the limiting plate 7 remains horizontal during the opening of the side door 14. The limiting plate 7 will slide continuously through the slide rail 72, causing the limiting hole 73 to gradually approach the limiting pad 11. When the side door 14 is opened to a certain angle, because the diameter of the limiting hole 73 is larger than the diameter of the limiting pad 11, due to gravity, the limiting hole 73 of the limiting plate 7 will slide down and fit onto the limiting pad 11. Figure 5 As shown, this achieves the purpose of limiting the position. When you want to close the side door 14 and release the limit, you only need to lift the limiting hole 73 part of the limiting plate 7 so that the limiting hole 73 is disengaged from the limiting pad 11, and the lower surface of the slide 72 part contacts the upper surface of the limiting pad 11.
[0039] The present invention has been described in detail above. The above description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of this application should still fall within the scope of the present invention.
Claims
1. A side door limiting structure for a construction machine, comprising a side door (14) and a frame (15), characterized in that: The side door (14) is provided with a fixed support (1), and the frame (15) is provided with a limiting support (13); the fixed support (1) is hingedly connected with a limiting plate (7), the limiting plate (7) is provided with a slide (72), one end of the slide (72) is provided with a limiting hole (73); the slide (72) is provided with a limiting bolt (9), the limiting bolt (9) is provided with a limiting sleeve II (10), the bottom end of the limiting sleeve II (10) is connected with a limiting pad (11), the top end of the limiting sleeve II (10) is connected with a gasket III (8), the limiting bolt (9) fixes the gasket III (8), the limiting sleeve II (10) and the limiting pad (11) on the limiting support (13), and the limiting hole (73) is limited in cooperation with the limiting pad (11).
2. A side door check structure for a working machine according to claim 1, characterized in that: The slide (72) is provided with a plurality of limiting holes (73).
3. A side door check structure for a working machine according to claim 2, characterized in that: The diameter of the limiting hole (73) is greater than the diameter of the limiting pad (11), the diameter of the limiting pad (11) is greater than the diameter of the limiting sleeve II (10), and the spacing between the gasket III (8) and the limiting pad (11) is greater than the thickness of the limiting plate (7).
4. A side door check structure for a working machine according to claim 3, characterized in that: The limiting plate (7) is provided with a mounting hole (71), and the limiting plate (7) is hingedly connected to the fixed support (1) through a fixing bolt (2); the shank of the fixing bolt (2) is provided with a limiting sleeve I (4), the limiting sleeve I (4) is provided with a gasket I (3) and a gasket II (5) at the upper end and the lower end respectively, and the fixing bolt (2) fixes the gasket I (3), the gasket II (5) and the limiting sleeve I (4) on the fixed support (1).
5. A side door check structure for a working machine according to claim 4, characterized in that: The spacing between the gasket I (3) and the gasket II (5) is greater than the thickness of the limiting plate (7).
6. A side door check structure for a working machine according to claim 5, characterized in that: The gasket I (3), the gasket II (5), the gasket III (8) and the limiting pad (11) are made of metal or nylon.
7. A side door check structure for a working machine according to claim 6, characterized in that: The limiting pad (11) is in the shape of a circular truncated cone.
8. A side door check structure for a working machine according to claim 1, characterized in that: The side surface of the limiting plate (7) and the side surface of the slide (72) are both arc surfaces.