Articulated frame steering limiting mechanism and engineering machinery

Abstract

The utility model relates to hinged type frame steering limiting, aims to solve the problem that an existing hinged type frame rigid steering limiting mechanism is large in impact, and provides a hinged type frame steering limiting mechanism and engineering machinery. The hinged frame steering limiting mechanism comprises a front frame, a rear frame and a limiting block on the front frame, wherein the front frame and the rear frame are rotationally connected through a hinged pin shaft, and nitrogen cylinders are fixedly installed at the positions, located on the two sides of the hinged pin shaft, of the rear end of the front frame. When the front frame rotates to a second preset angle relative to the rear frame, the piston of the nitrogen cylinder on the corresponding side abuts against the rear frame. The second predetermined angle is smaller than the first predetermined angle. According to the utility model, when the hinged frame is about to turn to a limit position, as the nitrogen cylinder is firstly propped against the rear frame for buffering, and then the limiting block is propped against the rear frame for limiting, elastic buffering is firstly carried out, and rigid limiting is carried out, the impact during rigid contact limiting can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to a steering limit for an articulated frame, and more specifically, to a steering limit mechanism for an articulated frame and a construction machinery. Background Art

[0002] Some construction machinery such as loaders and graders adopt articulated frames. The front and rear frames of the articulated frame are hinged by a hinge pin, and the front and rear frames are driven by a steering cylinder to rotate around the hinge pin for steering.

[0003] In order to ensure that the steering angle of the loader is within a certain range, a limit mechanism is usually adopted on the frame so that when the construction machinery frame steers to a certain angle, the front and rear frames contact through the limit mechanism on the front and rear frames to prevent the loader from continuing to steer.

[0004] At present, most of the steering limit mechanisms for articulated frames of construction machinery adopt the way of contact with rigid limit blocks. This way has a simple structure. Although it can effectively control the steering angle of the loader, due to the large impact force during contact, it is easy to cause damage to mechanical structures such as the steering cylinder of the loader. At the same time, the steering limit block itself wears out and fails, resulting in a shortened service life. At the same time, the rigid steering limit has large impact vibration and poor man-machine comfort. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is the problem of large impact of the existing rigid steering limit mechanism for the articulated frame, and to provide a steering limit mechanism for the articulated frame and a construction machinery.

[0006] The technical solution for the utility model to achieve its purpose is: a steering limit mechanism for an articulated frame, including a front frame and a rear frame rotatably connected by a hinge pin, and limit blocks installed on both sides of the rear end of the front frame at both sides of the hinge pin. When the front frame rotates relative to the rear frame to a first predetermined angle, the corresponding limit block abuts against the rear frame; nitrogen cylinders are fixedly installed on both sides of the rear end of the front frame at both sides of the hinge pin. When the front frame rotates relative to the rear frame to a second predetermined angle, the pistons of the corresponding nitrogen cylinders abut against the rear frame; the second predetermined angle is smaller than the first predetermined angle.

[0007] In the steering limit mechanism for the articulated frame of the utility model, a limit abutting portion for abutting against the end portion of the piston of the nitrogen cylinder is provided on the rear frame. When the end portion of the piston of the nitrogen cylinder abuts against the limit abutting portion, the connection line between the limit abutting portion and the hinge pin is perpendicular to the axis of the piston of the nitrogen cylinder.

[0008] In the steering limit mechanism of the articulated frame of the present utility model, the limit block is a rigid limit block. The rigid limit block is made of steel plate, and its elastic modulus is relatively large. When it abuts against the rear frame during the steering process, its elastic deformation is relatively small or even negligible.

[0009] In the steering limit mechanism of the articulated frame of the present utility model, the limit block can also be an elastic rubber limit block assembly, and the stiffness of the elastic rubber limit block assembly is greater than the stiffness of the nitrogen cylinder. The elastic rubber limit block assembly is composed of a steel plate and elastic rubber locked between the steel plates by bolts. The stiffness of the elastic rubber limit block assembly is greater than the stiffness of the nitrogen cylinder but less than the stiffness of the rigid limit block.

[0010] In the steering limit mechanism of the articulated frame of the present utility model, when the front frame rotates relative to the rear frame to the maximum steering angle, the piston retraction stroke of the nitrogen cylinder is less than the maximum retraction stroke that the piston of the nitrogen cylinder can achieve. That is, when the front and rear frames are steered to the limit angle, the rear frame cannot collide with the cylinder barrel of the nitrogen cylinder.

[0011] In the steering limit mechanism of the articulated frame of the present utility model, the limit block is spatially arranged between the nitrogen cylinder on the corresponding side and the articulated pin shaft.

[0012] In the steering limit mechanism of the articulated frame of the present utility model, the end face of the cylinder barrel of the nitrogen cylinder is fixedly abutted against the rear side plate of the wing box on the corresponding side of the front frame. Further, the nitrogen cylinder is detachably fixedly installed on the rear side plate of the wing box by bolts.

[0013] In the steering limit mechanism of the articulated frame of the present utility model, the limit block and the nitrogen cylinder are each arranged symmetrically with respect to the middle plane of the front frame in a mirror image manner.

[0014] The technical solution for the present utility model to achieve its purpose is: a construction machinery having the aforementioned steering limit mechanism of the articulated frame.

[0015] Compared with the prior art, in the present utility model, when the articulated frame steering is approaching the limit position, since first the nitrogen cylinder abuts against the rear frame for buffering and then the limit block abuts against the rear frame for limiting, first elastic buffering and then rigid limiting can effectively reduce the impact during rigid contact limiting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the steering limit mechanism of the articulated frame of the present utility model.

[0017] Figure 2 is a schematic structural diagram when the front and rear frames of the steering limit mechanism of the articulated frame of the present utility model are in contact and limited during steering.

[0018] Names and serial numbers of components in the figure:

[0019] Front frame 1, rear side plate of wing box 11, rear frame 2, limiting abutting part 21, steering cylinder 3, limiting block 4, nitrogen cylinder 5, mounting bolt 6, hinge pin 7. Specific implementation manner

[0020] The following describes the specific implementation plan in conjunction with the drawings.

[0021] As Figure 1 Shown, the articulated frame steering limiting mechanism includes a front frame 1 and a rear frame 2 rotatably connected through a hinge pin 7, and limiting blocks 4 installed at the upper rear end of the front frame 1 on both sides of the hinge pin 7. When the front frame 1 rotates relative to the rear frame 2 to a first predetermined angle, the limiting block 4 on the corresponding side abuts against the rear frame 2. Nitrogen cylinders 5 are fixedly installed at both sides of the hinge pin 7 at the rear end of the front frame 1. When the front frame 1 rotates relative to the rear frame 2 to a second predetermined angle, the piston end of the nitrogen cylinder 7 on the corresponding side abuts against the rear frame 2; the second predetermined angle is less than the first predetermined angle. The hinge pin 7 is located on the middle plane of the front frame and the rear frame, and the positions on both sides of the hinge pin 7 are also the positions on both sides of the middle plane of the frame on the frame.

[0022] In this embodiment, when the articulated frame performs a steering action, the front frame 1 rotates relative to the rear frame 2 around the hinge pin 7. When the rotation angle of the front frame 1 approaches the maximum steering angle, that is, the steering angle is the second predetermined angle, the piston end of the nitrogen cylinder 5 abuts against the rear frame 2, and the rear frame 2 pushes the piston of the nitrogen cylinder 5 to compress the nitrogen in it, absorbing the kinetic energy of the steering movement and reducing the rotation speed of the front frame 1 relative to the rear frame 2. When the rotation angle of the front frame 1 further decreases, that is, the steering angle is the first predetermined angle, the limiting block 4 abuts against the rear frame 2 for limiting, so as to realize the limiting and buffering of the front and rear frames when turning at an angle close to the steering limit angle. Since during the limiting and buffering process, elastic abutting buffering is performed before rigid contact limiting, the impact during limiting abutting can be effectively reduced, and the human-machine comfort can be improved.

[0023] Optionally, a limiting abutting part 21 for abutting against the piston end of the nitrogen cylinder 5 is provided on the rear frame 2. When the piston end of the nitrogen cylinder 5 abuts against the limiting abutting part 21, the connection line between the limiting abutting part 21 and the hinge pin 7 is perpendicular to the axis of the piston of the nitrogen cylinder 5. Further, the limiting block 4 is spatially arranged between the nitrogen cylinder 5 on the corresponding side and the hinge pin 7, that is, the nitrogen cylinder 5 is arranged outside the limiting block 4 relative to the hinge pin 7, so that a farther distance can be obtained between the nitrogen cylinder 5 and the hinge pin 7, and a greater moment can be obtained on the rear frame 2 when the nitrogen cylinder 5 contacts the rear frame 2.

[0024] Optionally, asFigure 2 As shown, the end face of the cylinder barrel of the nitrogen cylinder 5 is fixedly abutted against the rear side plate 11 of the wing box on the corresponding side of the front frame 1. Further, the nitrogen cylinder 5 is detachably fixed to the rear side plate 11 of the wing box by mounting bolts 6.

[0025] As Figure 1 shown, the limit block and the nitrogen cylinder are arranged symmetrically with respect to the middle plane of the front frame in a mirror image manner.

[0026] In this embodiment, the limit block 4 can be a rigid limit block, which is made of a steel plate and has a relatively large elastic modulus. When it abuts against the rear frame 2 during the steering process, its elastic deformation is relatively small or even negligible.

[0027] In some other embodiments, the limit block 4 can also be an elastic rubber limit block assembly, and the stiffness of the elastic rubber limit block assembly is greater than that of the nitrogen cylinder. The elastic rubber limit block assembly is composed of a steel plate and elastic rubber locked between the steel plates by bolts. Compared with the rigid limit block, the stiffness of the elastic rubber limit block assembly is less than that of the rigid limit block. Under the action of the same magnitude of force, the elastic deformations of the rigid limit block, the elastic rubber limit block assembly, and the nitrogen cylinder increase in sequence.

[0028] In this embodiment, when the front frame 1 rotates relative to the rear frame 2 to the maximum steering angle, the retraction stroke of the piston of the nitrogen cylinder 5 is less than the maximum retraction stroke that the piston of the nitrogen cylinder 5 can retract. That is, when the front and rear frames are steered to the maximum angle, the rear frame cannot collide with the cylinder barrel of the nitrogen cylinder either.

[0029] A construction machinery in this embodiment has the articulated frame steering limit mechanism described above. This construction machinery can be a loader, a grader, a roller, etc.

[0030] In this embodiment, when the articulated frame steering approaches the limit position, since the nitrogen cylinder abuts against the rear frame for buffering first, and then the limit block abuts against the rear frame for limiting, first elastic buffering and then rigid limiting can effectively reduce the impact during rigid contact limiting.

Claims

1. An articulated frame steering limit mechanism, comprising a front frame and a rear frame rotatably connected by a hinge pin, and limit blocks installed on both sides of the hinge pin at the rear end of the front frame, wherein when the front frame is turned relative to the rear frame to a first predetermined angle, the limit blocks on the corresponding side abut against the rear frame; characterized in that: A nitrogen cylinder is fixedly installed on both sides of the hinge pin at the rear end of the front frame. When the front frame is turned relative to the rear frame to a second predetermined angle, the piston of the nitrogen cylinder on the corresponding side abuts against the rear frame; the second predetermined angle is smaller than the first predetermined angle.

2. The articulated frame steering limiting mechanism according to claim 1, characterized in that: The rear frame is provided with a position-limiting abutting portion for abutting against the piston end of the nitrogen cylinder. When the piston end of the nitrogen cylinder abuts against the position-limiting abutting portion, a connecting line between the position-limiting abutting portion and the hinge pin is perpendicular to the axis of the piston of the nitrogen cylinder.

3. The articulated frame steering limiting mechanism according to claim 1, characterized in that: The limit block is a rigid limit block.

4. The articulated frame steering limiting mechanism according to claim 1, characterized in that: The limit block is an elastic rubber limit block assembly, and the rigidity of the elastic rubber limit block assembly is greater than the rigidity of the nitrogen cylinder.

5. The articulated frame steering limiting mechanism according to any one of claims 1 to 4, characterized in that: When the front frame is turned relative to the rear frame to a maximum steering angle, the piston retraction stroke of the nitrogen cylinder is less than the maximum retraction stroke of the nitrogen cylinder piston.

6. The articulated frame steering limiting mechanism according to any one of claims 1 to 4, characterized in that: The limit block is spatially arranged between the nitrogen cylinder and the hinge pin on the corresponding side.

7. The articulated frame steering limiting mechanism according to claim 6, characterized in that: The limit blocks and the nitrogen cylinder located on both sides of the middle plane of the front frame are respectively arranged in a mirror-symmetrical manner with respect to the middle plane of the front frame.

8. The articulated frame steering limiting mechanism according to claim 6, characterized in that: The cylinder end surface of the nitrogen cylinder is fixedly abutted against the rear side plate of the wing box on the corresponding side of the front frame.

9. The articulated frame steering limiting mechanism according to claim 8, characterized in that: The nitrogen cylinder is detachably fixed on the rear side plate of the wing box by bolts.

10. An engineering machine, characterized in that: An articulated frame steering limiting mechanism according to any one of claims 1 to 9.

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