A steering limit device for an arm-type aerial work platform

Abstract

The utility model relates to the field of engineering machinery, and discloses a steering limit device for an arm-type aerial work platform, comprising a front axle, two steering knuckles arranged on the left and right, a steering oil cylinder and a steering connecting rod; the two steering knuckles are rotatably connected to the two ends of the front axle respectively, and the steering oil cylinder is connected to the steering knuckle through the steering connecting rod; a structural limiter is provided at one end connected to the steering knuckle, and two structural limiters are symmetrically arranged. The maximum steering angle of the steering knuckle is mechanically limited by the structural limiter, which solves the existing problem of easy fatigue damage and short service life of the cylinder due to the stroke limit of the cylinder.

Description

Technical Field

[0001] The utility model relates to the field of engineering machinery, in particular to a steering limit device for an arm-type aerial work platform. Background Art

[0002] Aerial work platform is a widely used aerial work machine, which can greatly improve the work efficiency and safety of aerial construction. In the use of aerial work platform, steering is a very frequent action. Due to frequent steering, the existing structure relies on the cylinder stroke to limit the steering angle. Over time, the steering cylinder is prone to fatigue damage and the cylinder life is reduced. Utility Model Content

[0003] The utility model aims to provide a steering limit device for an arm-type aerial work platform, which mechanically limits the maximum steering angle of the steering knuckle through a structural limiter, thereby solving the existing problems of easy fatigue damage and short service life of the cylinder due to the limitation of the cylinder stroke.

[0004] The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] A steering limit device for an arm-type aerial work platform comprises a front axle, two steering knuckles arranged on the left and right, a steering cylinder and a steering connecting rod; the two steering knuckles are rotatably connected to the two ends of the front axle respectively, and the steering cylinder is connected to the steering knuckle through the steering connecting rod; a structural limiter is provided at one end of the front axle connected to the steering knuckle, and two structural limiters are symmetrically arranged.

[0006] When the steering knuckle rotates, the steering knuckle contacts the structural limiter, and the structural limiter limits the maximum rotation angle of the steering knuckle, thereby protecting the oil cylinder. Since two structural limiters are symmetrically arranged, the left steering limit position and the right steering limit position of the corresponding steering knuckle can be controlled.

[0007] The utility model is further configured as follows: the front axle comprises a pair of main connecting plates fixedly connected front and rear, and the ends of the pair of main connecting plates are fixed with a top plate and a bottom plate;

[0008] The steering knuckle comprises a pair of support blocks symmetrically arranged up and down, short shafts are fixed on the support blocks, and the two short shafts are rotatably connected to the corresponding top plate and bottom plate respectively;

[0009] The structural limiting member comprises a limiting block fixed on the top plate or the bottom plate, and the limiting block is arranged close to the supporting block and located on the inner side of the supporting block.

[0010] The support block includes an integrally formed arc surface and straight surfaces arranged at both ends of the arc surface and tangent to the arc surface. The straight surface can contact the limit block by rotating a certain angle with the short axis as the axis.

[0011] Through the above technical solution, the structural limiter can be fixed on the front axle by welding, and when the steering knuckle rotates, the straight surface of the support block presses against the corresponding limiter block, which is the maximum angle of the steering knuckle.

[0012] The utility model can also be configured as follows: the front axle comprises a pair of main connecting plates fixedly connected front and rear, and the ends of the pair of main connecting plates are fixed with a top plate and a bottom plate;

[0013] The structural limiting member includes a limiting protrusion formed at the front end of the bottom plate;

[0014] The steering knuckle comprises a pair of support blocks symmetrically arranged up and down, short shafts are fixed on the support blocks, and the two short shafts are rotatably connected to the corresponding top plate and bottom plate respectively;

[0015] The steering knuckle comprises a side support plate, and the side support plate can be in contact with the limiting protrusion.

[0016] The limiting protrusion is in a triangular block shape.

[0017] With the above technical solution, when the steering knuckle rotates and the side support plate contacts the limiting protrusion, the maximum rotation angle of the steering knuckle is reached;

[0018] The structural limiter is integrally formed on the front axle, and the structural limiter and the front axle are arranged as a whole, which can further improve the accuracy of the turning angle and the extreme position accuracy of the steering knuckle in two directions.

[0019] The outstanding effects of the utility model are:

[0020] Compared with the prior art, the maximum steering angle of the steering knuckle is mechanically limited by a structural limiter, solving the problem of the prior art of the cylinder being easily fatigued and damaged and having a short service life due to the cylinder stroke limitation.

[0021] By welding the structural limiter to the front axle or arranging the structural limiter and the front axle as one, the assembly of the limiter structure can be facilitated. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of Example 1;

[0023] Figure 2 for Figure 1 A partial enlarged view of A;

[0024] Figure 3 It is a structural schematic diagram of Example 2;

[0025] Figure 4 for Figure 3 A partial enlarged view of B.

[0026] Reference numerals: 10, front axle; 11, steering knuckle; 12, steering cylinder; 13, steering connecting rod;

[0027] 101. main connecting plate; 102. top plate; 103. bottom plate;

[0028] 111, support block; 112, short shaft; 113, side support plate;

[0029] 1111, arc surface; 1112, straight surface;

[0030] 20. Structural limiters;

[0031] 201, limiting block; 202, limiting protrusion. DETAILED DESCRIPTION

[0032] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0033] The following references Figures 1 to 4 The utility model is described as follows: Example

[0034] like Figure 1 , Figure 2 As shown, a steering limit device for an arm-type aerial work platform includes a front axle 10, two steering knuckles 11 arranged on the left and right, a steering cylinder 12 and a steering connecting rod 13; the two steering knuckles 11 are rotatably connected to the two ends of the front axle 10 respectively, and the steering cylinder 12 is connected to the steering knuckle 11 through the steering connecting rod 13; a structural limiter 20 is provided at one end of the front axle 10 connected to the steering knuckle 11.

[0035] The front axle 10 includes a pair of main connecting plates 101 fixedly connected front and rear, and a top plate 102 and a bottom plate 103 are fixed to the ends of the pair of main connecting plates 101; the steering knuckle 11 includes a pair of support blocks 111 symmetrically arranged up and down, and a short shaft 112 is fixed on the support block 111, and the two short shafts 112 are rotatably connected to the corresponding top plate 102 and bottom plate 103 respectively; the structural limiter 20 includes a limit block 201 fixed on the top plate 102 or the bottom plate 103, and the limit block 201 is arranged close to the support block 111 and is located on the inner side of the support block 111.

[0036] The support block 111 includes an integrally formed arc surface 1111 and straight surfaces 1112 disposed at both ends of the arc surface 1111 and tangent to the arc surface 1111 . The straight surface 1112 can contact the limit block 201 by rotating a certain angle around the short axis 112 as the axis. Example

[0037] like Figure 3 , Figure 4As shown, a steering limit device for an arm-type aerial work platform comprises a front axle 10, two steering knuckles 11 arranged on the left and right, a steering cylinder 12 and a steering connecting rod 13; the two steering knuckles 11 are rotatably connected to the two ends of the front axle 10 respectively, and the steering cylinder 12 is connected to the steering knuckle 11 through the steering connecting rod 13; a structural limiter 20 is provided at one end of the front axle 10 connected to the steering knuckle 11. The front axle 10 comprises a pair of main connecting plates 101 fixedly connected front and rear, and a top plate 102 and a bottom plate 103 are fixed to the ends of the pair of main connecting plates 101;

[0038] The structural limiting member 20 includes a limiting protrusion 202 formed at the front end of the bottom plate 103, and the limiting protrusion 202 is in a triangular block shape;

[0039] The steering knuckle 11 includes a pair of support blocks 111 symmetrically arranged up and down, and a short shaft 112 is fixed on the support block 111. The two short shafts 112 are rotatably connected to the corresponding top plate 102 and bottom plate 103 respectively;

[0040] The steering knuckle 11 further includes a side support plate 113 , which can rotate around the short axis and contact the limiting protrusion 202 .

[0041] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications of the above assumptions should also be regarded as the protection scope of the present invention.

Claims

1. A steering limit device for an arm-type aerial work platform, comprising a front axle (10), two steering knuckles (11) arranged on the left and right, a steering cylinder (12) and a steering connecting rod (13); the two steering knuckles (11) are rotatably connected to the two ends of the front axle (10), and the steering cylinder (12) is connected to the steering knuckle (11) through the steering connecting rod (13); characterized in that: One end of the front axle (10) connected to the steering knuckle (11) is provided with a structural limiter (20).

2. A steering limit device for an arm-type aerial work platform according to claim 1, characterized in that: The front axle (10) comprises a pair of main connecting plates (101) that are fixedly connected front and rear, and a top plate (102) and a bottom plate (103) are fixed to the ends of the pair of main connecting plates (101); The steering knuckle (11) comprises a pair of support blocks (111) symmetrically arranged up and down, a short shaft (112) being fixed on the support block (111), and the two short shafts (112) are rotatably connected to the corresponding top plate (102) and bottom plate (103) respectively; The structural limiting member (20) comprises a limiting block (201) fixed on the top plate (102) or the bottom plate (103); the limiting block (201) is arranged close to the supporting block (111) and is located on the inner side of the supporting block (111).

3. A steering limit device for an arm-type aerial work platform according to claim 2, characterized in that: The support block (111) comprises an integrally formed arc surface (1111) and straight surfaces (1112) arranged at both ends of the arc surface (1111) and tangent to the arc surface (1111); the straight surface (1112) can contact the limit block (201) by rotating a certain angle with the short axis (112) as an axis.

4. The steering limit device for an arm-type aerial work platform according to claim 1, characterized in that: The front axle (10) comprises a pair of main connecting plates (101) that are fixedly connected front and rear, and a top plate (102) and a bottom plate (103) are fixed to the ends of the pair of main connecting plates (101); The structural limiting member (20) comprises a limiting protrusion (202) formed at the front end of the bottom plate (103); The steering knuckle (11) comprises a side support plate (113), and the side support plate (113) can be in contact with the limiting protrusion (202).

5. The steering limit device for an arm-type aerial work platform according to claim 4, characterized in that: The limiting protrusion (202) is in the shape of a triangular block.

Images