Frame structure for preventing suspension oil cylinder from falling off, hydraulic system and crane

Abstract

The utility model discloses a vehicle frame structure capable of preventing suspension oil cylinders from falling off, the suspension oil cylinders are oppositely arranged on two sides of a vehicle frame, the upper ends and the lower ends of the suspension oil cylinders are respectively fixed on a suspension support and a lower cross arm support of the vehicle frame, and a detachable locking steel wire rope is arranged between the suspension support and the lower cross arm support. The frame structure further comprises a hydraulic system for preventing the suspension oil cylinder from falling off. According to different vehicle operation time, a mechanical device and a manual control valve are respectively adopted to prevent the suspension oil cylinder from falling off due to the gravity action of an axle.

Description

Technical Field

[0001] The utility model relates to the technical field of engineering machinery, in particular to a frame structure, a hydraulic system and a crane for preventing a suspension oil cylinder from falling off. Background Art

[0002] The vehicle suspension system is an assembly of multiple components connecting the frame and the axle or the frame and the wheel. It is generally composed of elastic elements, guide devices, shock absorbers and anti-roll bars. Its function is to transfer the load between the frame and the wheel, isolate or alleviate the impact and vibration caused by the uneven road surface during driving, so as to ensure the smoothness of the vehicle's driving, ride comfort and handling stability. The suspension system can be divided into coil spring suspension, leaf spring suspension, torsion bar spring suspension and gas suspension according to the different elastic elements. Oil-gas suspension technology is a new type of chassis suspension technology and a special case of air suspension. It has incomparable advantages over ordinary leaf spring suspension and is an indispensable key technology for the development of special vehicles, large engineering vehicles and other multi-axle vehicles.

[0003] The oil-gas suspension system includes two suspension cylinders, two accumulators and two suspension valves arranged on both sides of the frame. The accumulator on this side is differentially connected to the rodless chamber of the suspension cylinder on this side and the rod chamber of the suspension cylinder on the opposite side through the suspension valve on this side, and has the function of preventing the vehicle from tipping over when turning. When the vehicle is carrying out the loading and lifting operation, the suspension cylinder must be adjusted to the middle position first, the suspension system is adjusted to the rigid state, and the outriggers are extended to make the tires off the ground. The accumulator on this side and the rod chamber of the suspension cylinder on the opposite side are disconnected from the rodless chamber of the suspension cylinder on this side through the rigid elastic switching valve in the suspension valve. Because there is a certain pressure in the accumulator, the suspension cylinder does not extend due to the gravity of the axle, keeping the tires off the ground, which increases the safety of the crane operation.

[0004] The prior art has the following defects:

[0005] 1. When the vehicle is in motion, the accumulator is constantly in a reciprocating process of compression and release due to the bumpy road conditions. Over a long period of time, the inflation pressure in the accumulator is lower than the initial inflation pressure. When the suspension is in a rigid state, the accumulator on this side is still connected to the rod chamber of the opposite suspension cylinder. When the tire of the vehicle leaves the ground, under the action of the gravity of the axle, the oil in the rod chamber of the opposite suspension cylinder is squeezed toward the accumulator due to the low pressure of the accumulator on this side, causing the suspension cylinder to extend partially and fail to achieve a completely rigid state.

[0006] 2. Under the action of the gravity of the axle, the accumulator on this side and the rod chamber of the suspension cylinder on the opposite side always maintain a high-pressure state. There is a relief valve in the suspension valve. When the oil pressure of the oil circuit composed of the accumulator and the rod chamber of the suspension cylinder is greater than the opening pressure of the relief valve, the relief valve opens, the hydraulic oil in the oil circuit is reduced, causing the suspension cylinder to extend and the tire to touch the ground.

[0007] 3. The rigid elastic switching valve in the suspension valve is pneumatically controlled and automatically reset by the spring. When the reset spring is stuck, the accumulator and the rodless chamber of the suspension cylinder on this side are connected to the rod chamber of the suspension cylinder on the opposite side. Under the action of the axle gravity, the oil inside the rod chamber of the suspension cylinder on the opposite side is squeezed into the rodless chamber of the suspension cylinder on this side, causing the suspension cylinder on this side to extend, increasing the risk of crane operation. Summary of the invention

[0008] Purpose of the utility model: In order to overcome the shortcomings of the background technology, the first purpose of the utility model is to disclose a frame structure that prevents the suspension cylinder from falling off;

[0009] The second object is to disclose a hydraulic system for preventing a suspension cylinder from falling off;

[0010] The third object is to disclose a crane comprising the above frame structure and hydraulic system;

[0011] Depending on the vehicle operation time, mechanical devices and manual control valves are used to prevent the suspension cylinder from falling due to the gravity of the axle; when the vehicle is working at the operating position for a long time, the frame and the axle are connected with a locking wire rope, which is safe, reliable and low-cost. When the vehicle is working at the operating position for a short time, a manual reversing valve is used to close the oil circuit in the suspension hydraulic system, which is simple to operate and improves work efficiency.

[0012] Technical solution: The frame structure disclosed by the utility model prevents the suspension cylinder from falling off, and the suspension cylinders are arranged opposite to each other on both sides of the frame, and the upper and lower ends of the suspension cylinders are respectively fixed to the suspension support and the lower cross arm support of the frame, and a detachable locking wire rope is provided between the suspension support and the lower cross arm support.

[0013] Furthermore, the upper earring of the suspension cylinder is fixed to the suspension support through a pin, and the lower earring is fixed to the lower cross arm bracket through a pin.

[0014] Furthermore, the locking wire rope includes a wire rope and eye screws at both ends. Threaded holes matching the eye screws are provided on the suspension support and the lower cross arm bracket. The eye screws are inserted into the threaded holes to achieve mechanical fixation of the axle at any position of the suspension cylinder.

[0015] A hydraulic system for preventing a suspension cylinder from falling off, wherein the suspension cylinder comprises a suspension cylinder on this side and a suspension cylinder on the opposite side, and each of the suspension cylinders is respectively connected with a suspension valve on this side, a suspension valve on the opposite side, an accumulator on this side, and an accumulator on the opposite side;

[0016] A two-position four-way manual control valve is provided on the oil circuit connecting the accumulator on this side and the rodless chamber of the suspension cylinder on this side with the rod chamber of the suspension cylinder on the opposite side, and on the oil circuit connecting the accumulator on the opposite side and the rod chamber of the suspension cylinder on the opposite side with the rodless chamber of the suspension cylinder on this side.

[0017] A hydraulic system for preventing a suspension oil cylinder from falling off comprises the above-mentioned frame structure.

[0018] A crane comprises the above-mentioned frame structure for preventing the suspension cylinder from falling off, or comprises the above-mentioned hydraulic system for preventing the suspension cylinder from falling off.

[0019] Beneficial effects: Compared with the prior art, the advantages of the utility model are:

[0020] The manual control valve is used to switch the suspension oil circuit when supporting the vehicle without affecting the function of the oil-gas suspension in the driving state, thus solving the problem of cylinder dropping. The mechanical device (locking wire rope) is used to solve the problem of suspension cylinder dropping. This solution is safe, reliable and low in cost. When the vehicle is working at the working position for a long time, the frame and the axle are connected by the locking wire rope, which is safe and reliable. When the vehicle is working at the working position for a short time, the manual reversing valve is used to close the oil circuit in the suspension hydraulic system. The operation is simple and the work efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the frame structure of the utility model;

[0022] Figure 2 It is a schematic diagram of the hydraulic system of the utility model. DETAILED DESCRIPTION

[0023] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] A crane adopts Figure 1 The frame structure shown in the figure prevents the suspension cylinder from falling off, the suspension cylinder 1 is arranged opposite to each other on both sides of the frame, the upper and lower ends of the suspension cylinder 1 are respectively fixed to the suspension support 2 and the lower cross arm support 3 of the frame, and a detachable locking wire rope 4 is provided between the suspension support 2 and the lower cross arm support 3.

[0025] The upper earring of the suspension cylinder 1 is fixed to the suspension support 2 through a pin, and the lower earring is fixed to the lower cross arm bracket 3 through a pin. The locking wire rope 4 includes a wire rope 401 and eye screws 402 at both ends. The suspension support 2 and the lower cross arm bracket 3 are provided with threaded holes matching the eye screws 402. The eye screws 402 are inserted into the threaded holes to achieve mechanical fixation of the suspension cylinder 1 at any position of the axle.

[0026] When the vehicle reaches the lifting operation position, the suspension cylinder 1 needs to be leveled to the middle position and the suspension system is adjusted to a rigid state. Screw the eye screw 402 into the threaded holes on the suspension support 2 and the lower cross arm bracket 3. The length of the wire rope can be freely adjusted according to the length of the suspension cylinder, so that the suspension cylinder 1 can achieve mechanical fixation of the axle at any position. When the locking wire ropes on both sides are fixedly connected and the legs are extended, the axle is fixedly connected to the frame through the locking wire rope 4 and will not fall due to its own gravity, increasing the safety of the lifting operation on the vehicle. When the vehicle completes the lifting operation, retract the legs first and then remove the locking wire ropes on both sides. The vehicle suspension system can be driven normally after being adjusted to an elastic state.

[0027] Also includes Figure 2 In the hydraulic system shown, the suspension cylinder 1 includes a local suspension cylinder 101 and an opposite suspension cylinder 102, and both are respectively connected to a local suspension valve 501, an opposite suspension valve 502, a local accumulator 601, and an opposite accumulator 602.

[0028] A two-position four-way manual control valve 7 is provided on the oil circuit connecting the accumulator 601 on this side and the rodless chamber of the suspension cylinder 101 on this side with the rod chamber of the suspension cylinder 102 on the opposite side, and on the oil circuit connecting the accumulator 602 on the opposite side and the rod chamber of the suspension cylinder 102 on the opposite side with the rodless chamber of the suspension cylinder 101 on this side.

[0029] When the vehicle is in a normal travel state, the control valve is in a through state to ensure that the oil-gas suspension system functions normally. When the vehicle reaches the lifting operation position, the suspension cylinder needs to be leveled to the middle position and the suspension system is adjusted to a rigid state. The reversing function of the manual control valve 7 is used to disconnect the oil circuit connection between the accumulator 601 on this side and the rodless chamber of the suspension cylinder 101 on this side and the rod chamber of the suspension cylinder 102 on the opposite side, so that the hydraulic oil in the rod chamber of the suspension cylinder 102 on the opposite side is in a completely closed state, which solves the problem of insufficient accumulator gas pressure, excessive oil pressure in the small chamber of the accumulator 601 on this side and the suspension cylinder 102 on the opposite side, which causes the overflow valve in the suspension valve 102 on the opposite side to open, and the rigid elastic switching valve in the suspension valve 502 on the opposite side to be easily stuck, causing the axle to drop. When the vehicle completes the lifting operation, the outriggers are retracted first and then the manual control valve 7 is adjusted to a through state. After the vehicle suspension system is adjusted to an elastic state, it can travel normally.

[0030] When the vehicle is working at the working position for a long time, the frame and the axle are connected by a locking wire rope, which is safe, reliable and low-cost. When the vehicle is working at the working position for a short time, a manual control valve is used to close the oil circuit in the suspension hydraulic system, which is simple to operate and improves work efficiency.

Claims

1. A frame structure for preventing a suspension cylinder from falling off, characterized in that: The suspension cylinder (1) is arranged opposite to each other on both sides of the vehicle frame. The upper and lower ends of the suspension cylinder (1) are respectively fixed to a suspension support (2) and a lower cross arm support (3) of the vehicle frame. A detachable locking wire rope (4) is provided between the suspension support (2) and the lower cross arm support (3).

2. The frame structure for preventing the suspension cylinder from falling off according to claim 1 is characterized in that: The upper earring of the suspension cylinder (1) is fixed to the suspension support (2) via a pin, and the lower earring is fixed to the lower cross arm bracket (3) via a pin.

3. The frame structure for preventing the suspension cylinder from falling off according to claim 1 is characterized in that: The locking steel wire rope (4) comprises a steel wire rope (401) and eye screws (402) at both ends. The suspension support (2) and the lower cross arm support (3) are provided with threaded holes matching the eye screws (402). The eye screws (402) are inserted into the threaded holes to achieve mechanical fixation of the suspension cylinder (1) at any position of the axle.

4. A hydraulic system for preventing a suspension cylinder from falling off, characterized in that: The vehicle frame structure comprises the vehicle frame structure as claimed in claim 1, wherein the suspension cylinder (1) comprises a suspension cylinder (101) on the local side and a suspension cylinder (102) on the opposite side, and each of the suspension cylinders is respectively connected to a suspension valve (501) on the local side, a suspension valve (502) on the opposite side, an accumulator (601) on the local side, and an accumulator (602) on the opposite side; A two-position four-way manual control valve (7) is provided on the oil circuit connecting the rodless chamber of the accumulator (601) on this side and the suspension cylinder (101) on this side with the rod chamber of the suspension cylinder (102) on the opposite side, and on the oil circuit connecting the rod chamber of the accumulator (602) on the opposite side and the suspension cylinder (102) on the opposite side with the rodless chamber of the suspension cylinder (101) on this side.

5. A crane, characterized in that: The vehicle frame structure comprising the vehicle frame structure for preventing the suspension cylinder from falling off as claimed in claim 1, or the hydraulic system comprising the vehicle frame structure for preventing the suspension cylinder from falling off as claimed in claim 4.

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