Compact slow-reset oil-gas buffering cushion

Abstract

The utility model relates to a compact type slow reset oil gas buffer cushion, and relates to the field of dumper buffer devices. The buffering device comprises a limiting support, a buffering oil cylinder connected with the limiting support, an oil cylinder energy accumulator connected with the buffering oil cylinder, a connecting pipeline used for connecting the buffering oil cylinder and the oil cylinder energy accumulator, connecting joints arranged at the two ends of the connecting pipeline and a sealing mechanism. The limiting supports are fixedly installed on a vehicle frame, the number of the limiting supports is one or more, the limiting supports are connected in parallel, and the number of the buffering oil cylinders is the same as that of the limiting supports. The self-dumping truck has the advantages that the box hopper of the self-dumping truck is limited and buffered in the overturning process, the problem that the strength of the box hopper and the frame is reduced due to rigid collision of the box hopper and the frame is solved, and therefore the service life of the self-dumping truck is prolonged.

Description

Technical Field

[0001] The present application relates to the field of dump truck buffer devices, and in particular to a compact slow-reset oil-gas buffer pad. Background Art

[0002] A dump truck is a vehicle that unloads its cargo by lifting a device. It mainly consists of a frame, a lifting device and a box. The limit of the box will affect the box's flip angle, the contact between the box and the frame, and the use of the lifting cylinder, thus affecting the operability, stability, safety and reliability of the dump truck, and also affecting the service life of the lifting cylinder, frame and box.

[0003] At present, the lifting end limit of dump trucks generally adopts the lifting cylinder control limit or sets the limit bracket rigid limit on the frame. The lifting cylinder operation limit has the problem of difficult operation and inability to achieve accurate control of the box bucket flip angle. In addition, the driver may cause the lifting cylinder to reach the limit extension due to untimely operation during the operation process, thereby damaging the cylinder and related parts. Due to the heavy load of dump trucks, the lifting force of the lifting cylinder is large, so the impact force of the box bucket on the limit bracket and frame is large. Multiple impacts may cause impact damage to the contact surface between the frame and the box bucket, thereby reducing the service life of the frame and the box bucket.

[0004] With respect to the above-mentioned related technologies, the inventor believes that the existing limit buffer device of the dump truck has the problem that the limit of the box bucket is not accurate, the impact force is large and it is easy to cause damage, thereby reducing the service life of the frame and the box bucket. Utility Model Content

[0005] In order to solve the above technical problems, the present application provides a compact slow-reset oil-gas cushion.

[0006] The present application provides a compact slow-reset oil-gas cushion, which adopts the following technical solution:

[0007] A compact slow-reset oil-gas cushion comprises a limit bracket, a buffer oil cylinder connected to the limit bracket, a cylinder accumulator connected to the buffer oil cylinder, a connecting pipeline for connecting the buffer oil cylinder and the cylinder accumulator, and connecting joints and a sealing mechanism arranged at both ends of the connecting pipeline; the limit bracket is fixedly mounted on a vehicle frame, the number of the limit brackets is one or several in parallel, and the number of the buffer oil cylinders is the same as the number of the limit brackets.

[0008] By adopting the above technical solution, the limit bracket fixes the buffer cylinder on the frame, accurately controls the extreme position of the bucket flipping, and prevents the buffer cylinder from being used beyond the design range to protect the buffer cylinder. The bucket abuts against the buffer cylinder during the flipping process, and the plunger of the buffer cylinder is retracted under force. The hydraulic oil in the rodless chamber enters the cylinder accumulator through the connecting pipeline. The cylinder accumulator provides resistance for the retraction of the plunger of the buffer cylinder, so that the buffer cylinder realizes the limit buffering of the bucket, thereby reducing the rigid collision between the bucket and the frame during the flipping process, reducing the damage to the bucket and the frame, and thus improving the service life of the dump truck.

[0009] Preferably, the cylinder accumulator is a piston accumulator, which is fixedly mounted on a vehicle frame, the hydraulic oil chamber of the cylinder accumulator is connected to the rodless chamber of the buffer cylinder via the connecting pipeline, and the air chamber of the cylinder accumulator is filled with nitrogen.

[0010] By adopting the above technical solution, the cylinder accumulator uses the compressibility of gas to provide damping power for the buffer cylinder, so that the buffer cylinder can limit the buffering of the box bucket.

[0011] Preferably, a buffer pad is provided at one end of the plunger of the buffer oil cylinder away from the rodless cavity.

[0012] By adopting the above technical solution, the provision of the buffer pad reduces the rigid contact between the box bucket and the buffer cylinder, thereby improving the buffering effect of the buffer cylinder on the box bucket.

[0013] Preferably, a mounting groove is provided on the plunger of the buffer cylinder, the buffer pad is arranged in the mounting groove, and the height of the buffer pad is greater than the depth of the mounting groove.

[0014] By adopting the above technical solution, the buffer pad is arranged in the installation groove, which improves the installation stability of the buffer pad, thereby reducing the phenomenon of the buffer pad falling off, and further improving the buffering effect of the buffer pad.

[0015] Preferably, one end of the buffer pad away from the mounting groove is a spherical structure.

[0016] By adopting the above technical solution, the spherical structure makes the external force evenly distributed on the cushion, reducing local pressure concentration, thereby improving the cushioning effect of the cushion. Due to the dispersion of force, the wear of the spherical contact point will be relatively reduced, thereby extending the service life of the cushion.

[0017] Preferably, the cylinder accumulator is connected to an adjustable slow lifting function valve group for realizing slow resetting of the buffer cylinder.

[0018] By adopting the above technical scheme, the one-way throttling effect of the adjustable slow lifting function valve group enables the oil in the hydraulic oil chamber of the cylinder accumulator to slowly flow to the rodless chamber of the buffer cylinder, thereby slowly resetting the plunger of the buffer cylinder, thereby achieving effective protection of the buffer cylinder and increasing the service life of the buffer cylinder.

[0019] Preferably, the cylinder accumulator is connected to a pressure gauge.

[0020] By adopting the above technical solution, the staff can determine whether the internal pressure of the cylinder accumulator is kept within a safe range by observing the pressure gauge. If the pressure deviates from the normal range, the damage to the internal structure of the cylinder accumulator caused by pressure overload can be reduced through timely adjustment, thereby increasing the service life of the cylinder accumulator.

[0021] Preferably, the buffer pad is a nylon buffer pad.

[0022] By adopting the above technical solution, the nylon buffer pad has higher strength, as well as excellent wear resistance and high temperature resistance, thereby improving the buffering effect of the buffer cylinder on the box bucket.

[0023] In summary, this application has the following beneficial technical effects:

[0024] 1. By setting up a buffer cylinder connected to the cylinder accumulator, the buffer range of the box bucket flipping process is increased, and the rigid collision between the box bucket and the frame is reduced, thereby increasing the service life of the box bucket and the frame;

[0025] 2. The adjustable slow lifting function valve group is set to achieve slow reset of the buffer cylinder, thereby extending the service life of the buffer cylinder;

[0026] 3. The present application can be installed and used in a narrow and limited space, thus making the present application highly flexible and adaptable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the cross-sectional structure of a compact slow-reset oil-gas cushion;

[0028] Figure 2 It is a schematic diagram of the cross-sectional structure of the limit bracket, the buffer cylinder and the buffer pad;

[0029] Figure 3 It is a schematic diagram of the cross-sectional structure of the cylinder accumulator and the adjustable slow lifting function valve group.

[0030] Explanation of the reference numerals in the accompanying drawings: 1. Limit bracket; 2. Buffer cylinder; 21. Rodless chamber; 22. Filling port; 23. Rod chamber; 24. Lubricating oil filling port; 25. Ventilation port; 26. Mounting groove; 3. Cylinder accumulator; 31. Hydraulic oil chamber; 32. Air chamber; 33. Pressure gauge; 4. Connecting pipeline; 5. Connecting joint; 6. Sealing mechanism; 61. Oil and gas seal; 62. Hydraulic seal; 63. Dustproof seal; 7. Buffer pad; 8. Adjustable slow lifting function valve group. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-3 This application is described in further detail.

[0032] The embodiment of the present application discloses a compact slow-reset oil-gas cushion.

[0033] Reference Figure 1 , Figure 2 and Figure 3 A compact slow-reset oil-gas cushion comprises a limit bracket 1, a buffer cylinder 2 connected to the limit bracket 1, a cylinder accumulator 3 connected to the buffer cylinder 2, a connecting pipe 4 for connecting the buffer cylinder 2 and the cylinder accumulator 3, and connecting joints 5 and a sealing mechanism 6 arranged at both ends of the connecting pipe 4. The limit bracket 1 is fixedly mounted on the vehicle frame, the number of the limit brackets 1 is two, and the number of the buffer cylinders 2 is the same as the number of the limit brackets 1.

[0034] In the embodiment of the present application, the buffer cylinder 2 is a single-acting hydraulic cylinder with a cylinder diameter of Φ140 mm, a rod diameter of Φ120 mm, and a stroke of 40 mm. The rodless chamber 21 of the buffer cylinder 2 is provided with a filling port 22, and the rod chamber 23 is provided with a lubricating oil filling port 24 and a ventilation port 25. The sealing mechanism 6 includes a hydraulic seal 62 arranged on the piston head of the plunger and a dustproof seal 63 arranged on the guide sleeve.

[0035] A buffer pad 7 is fixedly arranged at one end of the plunger of the buffer oil cylinder 2 away from the rodless cavity 21. A mounting groove 26 is provided on the plunger of the buffer oil cylinder 2, and the buffer pad 7 is arranged in the mounting groove 26. The height of the buffer pad 7 is greater than the depth of the mounting groove 26. The end of the buffer pad 7 away from the mounting groove 26 is a spherical structure. The buffer pad 7 is a nylon buffer pad.

[0036] In the embodiment of the present application, the cylinder accumulator 3 is a piston accumulator with a cylinder diameter of Φ140 mm and a stroke of 95 mm. The cylinder accumulator 3 is fixedly arranged on the vehicle frame, and the sealing mechanism 6 includes an oil-gas seal 61 arranged on the piston. The hydraulic oil chamber 31 of the cylinder accumulator 3 is connected to the rodless chamber 21 of the buffer cylinder 2 through the connecting pipeline 4, and the air chamber 32 of the cylinder accumulator 3 is filled with nitrogen, which is industrial nitrogen with a purity greater than 99%. The connecting pipeline 4 is a high-pressure oil pipe. The cylinder accumulator 3 is fixedly connected with a pressure gauge 33.

[0037] The cylinder accumulator 3 is connected to an adjustable slow lifting function valve group 8 for realizing slow resetting of the buffer cylinder 2. The slow resetting of the buffer cylinder 2 is realized by the adjustable slow lifting function valve group 8, thereby realizing structural protection of the buffer cylinder 2 and further increasing the service life of the buffer cylinder 2.

[0038] The implementation principle of a compact slow-reset oil-gas buffer pad in an embodiment of the present application is as follows: when the bucket of the dump truck flips over and enters the buffer range, the bucket contacts the buffer cylinder 2 through the buffer pad 7, compressing the buffer cylinder 2 to make it gradually retract, and the hydraulic oil in the rodless chamber 21 gradually flows into the hydraulic oil chamber 31 of the cylinder accumulator 3, and the piston of the cylinder accumulator 3 gradually moves toward the air chamber 32, the volume of nitrogen in the air chamber 32 is gradually compressed, and the pressure in the air chamber 32 gradually increases, and the increased pressure is transmitted to the rodless chamber 21 of the buffer cylinder 2 through the hydraulic oil in the hydraulic oil chamber 31 of the cylinder accumulator 3, so that the damping effect of the compression of the rodless chamber 21 is gradually increased, thereby realizing the buffering of the bucket flipping process, and when the bucket reaches the extreme position of flipping, it abuts against the limit bracket 1 to stop. After the lifting process is completed, the lifting cylinder retracts to separate the bucket from the buffer cylinder 2, and the hydraulic oil chamber 31 of the cylinder accumulator 3 replenishes hydraulic oil into the rodless chamber 21 of the buffer cylinder 2. The buffer cylinder 2 gradually extends and resets. The adjustable slow lifting function valve group 8 throttles the process of replenishing hydraulic oil, so that the buffer cylinder 2 slowly extends until it is fully reset, thereby achieving the purpose of protecting the buffer cylinder 2.

[0039] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A compact slow-reset oil-gas cushion, characterized in that: The invention comprises a limit bracket (1), a buffer oil cylinder (2) connected to the limit bracket (1), a cylinder accumulator (3) connected to the buffer oil cylinder (2), a connecting pipeline (4) for connecting the buffer oil cylinder (2) and the cylinder accumulator (3), connecting joints (5) and a sealing mechanism (6) arranged at both ends of the connecting pipeline (4); the limit bracket (1) is fixedly mounted on a vehicle frame, the number of the limit brackets (1) is one or several in parallel, and the number of the buffer oil cylinders (2) is the same as the number of the limit brackets (1).

2. A compact slow-reset oil-gas cushion according to claim 1, characterized in that: The oil cylinder accumulator (3) is a piston accumulator, and the oil cylinder accumulator (3) is fixedly arranged on the vehicle frame. The hydraulic oil chamber (31) of the oil cylinder accumulator (3) is connected to the rodless chamber (21) of the buffer oil cylinder (2) through the connecting pipeline (4), and the air chamber (32) of the oil cylinder accumulator (3) is filled with nitrogen.

3. A compact slow-reset oil-gas cushion according to claim 2, characterized in that: A buffer pad (7) is provided at one end of the plunger of the buffer oil cylinder (2) away from the rodless chamber (21).

4. A compact slow-reset oil-gas cushion according to claim 3, characterized in that: The plunger of the buffer oil cylinder (2) is provided with a mounting groove (26), the buffer pad (7) is arranged in the mounting groove (26), and the height of the buffer pad (7) is greater than the depth of the mounting groove (26).

5. A compact slow-reset oil-gas cushion according to claim 4, characterized in that: One end of the buffer pad (7) away from the mounting groove (26) is a spherical structure.

6. A compact slow-reset oil-gas cushion according to claim 5, characterized in that: The oil cylinder accumulator (3) is connected to an adjustable slow lifting function valve group (8) for realizing slow resetting of the buffer oil cylinder (2).

7. A compact slow-reset oil-gas cushion according to claim 6, characterized in that: The oil cylinder accumulator (3) is connected to a pressure gauge (33).

8. A compact slow-reset oil-gas cushion according to claim 7, characterized in that: The buffer pad (7) is a nylon buffer pad.

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