Multi-stage telescopic oil cylinder of dumper

Abstract

The multistage telescopic oil cylinder comprises a mounting seat and a multistage oil cylinder mechanism, a first oil cavity is formed in the mounting seat, a second oil cavity is formed in the upper side of the first oil cavity, the multistage oil cylinder mechanism comprises a bottom ring, the upper side of the bottom ring is fixedly connected with a first piston rod, and the interior of the first piston rod is fixedly connected with a limiting ring; a blocking block is arranged in an inner cavity of the first piston rod, and a second piston rod is fixedly connected to the upper side of the blocking block. Through the arrangement of the multi-stage oil cylinder mechanism, pressure oil can enter the first piston rod, the plug block drives the second piston rod to extend upwards, when the second piston rod drives the connecting block to move upwards to a certain position, the connecting block can drive the top block to move, meanwhile, along with the continuous action of pressure, the bottom ring slowly moves upwards in the second oil cavity, and the bottom ring is prevented from moving upwards. The jacking blocks are jointly pushed to rise to the required height and angle, so that a cargo box of the dumper can have a large inclination angle, and unloading can be more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of telescopic oil cylinders for dump trucks, and specifically to a multi-stage telescopic oil cylinder for dump trucks. Background Art

[0002] The multi-stage telescopic oil cylinder of a dump truck is a key component in the hydraulic system of a dump truck, mainly used to achieve the lifting and tilting actions of the dump truck carriage. It is usually composed of a nested combination of cylinder barrels and piston rods with different diameters. For dump trucks used to transport heavy materials such as ores, coals, and sands, strong lifting force and stability are required, and the multi-stage telescopic oil cylinder can meet these requirements. In the fields of urban construction, road construction, etc., medium-sized dump trucks are often used to transport construction waste, earthwork, etc., and the multi-stage telescopic oil cylinder provides them with an efficient lifting function.

[0003] On some dump trucks, telescopic oil cylinders are installed to tilt the cargo box for convenient unloading. Currently, the telescopic oil cylinders used in large dump trucks generally have only one cylinder barrel, with a relatively simple structure and limited lifting height. This may result in an insufficient tilting angle of the cargo box, making it inconvenient to unload the goods and having poor practicability. Therefore, to solve the above problems, a multi-stage telescopic oil cylinder for a dump truck is hereby proposed. Summary of the Utility Model

[0004] The utility model mainly solves the technical problems existing in the above-mentioned prior art and provides a multi-stage telescopic oil cylinder for a dump truck.

[0005] To achieve the above object, the utility model provides the following technical solution: A multi-stage telescopic oil cylinder for a dump truck, including a mounting seat and a multi-stage oil cylinder mechanism. A first oil cavity is opened inside the mounting seat, and a second oil cavity is arranged above the first oil cavity. The multi-stage oil cylinder mechanism includes a bottom ring. A first piston rod is fixedly connected to the upper side of the bottom ring. A limiting ring is fixedly connected inside the first piston rod. A blocking block is arranged inside the inner cavity of the first piston rod. A second piston rod is fixedly connected to the upper side of the blocking block. A connecting block is fixedly connected to the upper side of the second piston rod. A top block is hinged to the outside of the connecting block. An installation groove is opened inside the top block, and the connecting block is arranged inside the installation groove and hinged to the top block. There are several multi-stage oil cylinder mechanisms.

[0006] Preferably, the bottom ring is arranged inside the second oil cavity. The blocking block is slidably connected to the first piston rod. The second piston rod is arranged inside the first piston rod. The first oil cavity is communicated with the second oil cavity. There are three top blocks, and three multi-stage oil cavity mechanisms are arranged on the lower side of each top block. The top blocks are arranged in three columns. The limiting ring is fixed at a position near the lower end of the inner cavity of the first piston rod. Pressure oil can enter the inner cavity of the first piston rod through the bottom ring.

[0007] Preferably, a first rubber ring is fixedly connected to the outside of the bottom ring. The first rubber ring is arranged inside the second oil chamber and is slidably connected to the second oil chamber. Through the arrangement of the second rubber ring, pressure oil can be prevented from overflowing from the second oil chamber, thereby preventing oil leakage.

[0008] Preferably, a setting groove is formed inside the first oil chamber. A second rubber ring is fixedly connected inside the setting groove. The setting groove is arranged at both ends inside the first oil chamber. When the conduit for conveying pressure oil is inserted into the first oil chamber, it will contact the second rubber ring, making the connection between the conduit and the first oil chamber tighter.

[0009] Preferably, a rubber pad is fixedly connected to the lower side of the mounting seat. Texture grooves are formed on the lower surface of the rubber pad. A number of texture grooves are formed and are evenly distributed linearly on the lower surface of the rubber pad.

[0010] Preferably, fixing plates are fixedly connected to both sides of the mounting seat. Fixing holes are formed through the surfaces of the fixing plates. There are four fixing plates, which are respectively arranged at both sides of both sides of the mounting seat.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] 1. Through the arrangement of the multi-stage oil cylinder mechanism in the present utility model, pressure oil will enter the first piston rod, and the plug block drives the second piston rod to extend upward. When the second piston rod drives the connecting block to move upward to a certain position, the connecting block will drive the top block to move. At the same time, with the continuous action of the pressure, the bottom ring slowly moves upward in the second oil chamber, jointly pushing the top block to rise to the required height and angle, enabling a larger tilting angle for the cargo box of the dump truck and making unloading more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings are used to provide a further understanding of the present utility model and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0014] Figure 1 is a schematic structural diagram of the overall front view of the present utility model;

[0015] Figure 2 is a schematic structural diagram of the first front sectional view of the present utility model;

[0016] Figure 3 is a schematic structural diagram of the second front sectional view of the present utility model;

[0017] Figure 4 is a schematic structural diagram of the overall side view of the present utility model.

[0018] In the figure: 1. mounting seat; 2. first oil chamber; 3. second oil chamber; 4. bottom ring; 5. first piston rod; 6. limit ring; 7. plug; 8. second piston rod; 9. connecting block; 10. top block; 11. mounting groove; 12. first rubber ring; 13. setting groove; 14. second rubber ring; 15. rubber pad; 16. texture groove; 17. fixing plate; 18. fixing hole. Detailed implementation manner

[0019] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0020] Please refer to Figures 1-4 , a multi-stage telescopic oil cylinder for a dump truck, including a mounting seat 1 and a multi-stage oil cylinder mechanism. A first oil chamber 2 is opened inside the mounting seat 1, and a second oil chamber 3 is arranged on the upper side of the first oil chamber 2. The multi-stage oil cylinder mechanism includes a bottom ring 4. A first piston rod 5 is fixedly connected to the upper side of the bottom ring 4. A limit ring 6 is fixedly connected inside the first piston rod 5. A plug 7 is arranged in the inner cavity of the first piston rod 5. A second piston rod 8 is fixedly connected to the upper side of the plug 7. A connecting block 9 is fixedly connected to the upper side of the second piston rod 8. A top block 10 is hinged to the outside of the connecting block 9. A mounting groove 11 is opened inside the top block 10. The bottom ring 4 is arranged inside the second oil chamber 3. The plug 7 is slidably connected to the first piston rod 5. The second piston rod 8 is arranged inside the first piston rod 5. The first oil chamber 2 is communicated with the second oil chamber 3. There are three top blocks 10. When pressure oil enters the first oil chamber 2 inside the mounting seat 1 through a conduit, since the first oil chamber 2 is communicated with the second oil chamber 3, the pressure oil will enter the second oil chamber 3. As the pressure oil continues to enter, the pressure oil will enter the first piston rod 5. The pressure oil starts to push the plug 7 upward. The plug 7 drives the second piston rod 8 to extend upward. At this time, the second piston rod 8 starts to move upward inside the first piston rod 5. Since the plug 7 is slidably connected to the first piston rod 5, the smoothness of the movement is ensured. When the second piston rod 8 drives the connecting block 9 to move upward to a certain position, the connecting block 9 will drive the top block 10 to move. Since the connecting block 9 is arranged in the mounting groove 11 inside the top block 10 and is hinged to the top block 10, the top block 10 starts to change its angle as the connecting block 9 rises. At the same time, with the continuous action of the pressure, the bottom ring 4 slowly moves upward inside the second oil chamber 3, jointly pushing the top block 10 up to the required height and angle, so that a larger tilting angle can be provided for the cargo box of the dump truck.

[0021] In one aspect of this embodiment, the pressurized oil acts on the bottom ring 4. Driven by the pressurized oil, the bottom ring 4 drives the first piston rod 5 to start moving upward. Since the first rubber ring 12 outside the bottom ring 4 is slidably connected to the second oil chamber 3 and functions as a seal to prevent the pressurized oil from overflowing from the second oil chamber 3, when the conduit for conveying the pressurized oil is inserted into the first oil chamber 2, it will contact the second rubber ring 14 in the setting groove 13, thereby increasing the friction with the conduit, making the connection between the conduit and the first oil chamber 2 tighter and not easily falling off.

[0022] In one aspect of this embodiment, when the dump truck is driving or unloading, vibrations will occur. The rubber pad 15 can absorb and mitigate these vibrations, thereby reducing the impact force transmitted to the oil cylinder and other components, helping to protect the oil cylinder and other connecting components and extending their service life. The several linearly and evenly distributed texture grooves 16 formed on the lower surface of the rubber pad 15 are mainly to increase the friction between the rubber pad 15 and the installation site. The fixing holes 18 are formed through the surface of the fixing plate 17. Through bolts, rivets or other suitable connecting parts passing through these fixing holes 18, the mounting seat 1 is tightly connected to the frame of the dump truck or other specified parts. When the dump truck is working, even facing various acting forces brought by the lifting of the carriage and the dynamic loads during vehicle driving, it can ensure that the oil cylinder mounting seat 1 will not loosen or fall off, ensuring that the oil cylinder can function stably and reliably, providing strong support and guarantee for the unloading operation of the dump truck.

[0023] The working principle of the present utility model: When the multi-stage telescopic oil cylinder of this dump truck is in use, the mounting seat 1 is installed on the dump truck, the top block 10 is installed on the cargo box of the dump truck, and the conduit for conveying the pressurized oil is inserted into the first oil chamber 2. The first oil chamber 2 is provided with a third row, and the conveying and processing of the pressurized oil in each row can be adjusted according to the arrangement. When the pressurized oil enters the first oil chamber 2 inside the mounting seat 1 through the conduit, since the first oil chamber 2 communicates with the second oil chamber 3, the pressurized oil will enter the second oil chamber 3. As the pressurized oil continues to enter, the pressurized oil will enter the first piston rod 5, and the pressurized oil starts to push the plug 7 upward. The plug 7 drives the second piston rod 8 to extend upward. At this time, the second piston rod 8 starts to move upward inside the first piston rod 5. Since the plug 7 is slidably connected to the first piston rod 5, the movement is ensured to be smooth. When the second piston rod 8 drives the connecting block 9 to move upward to a certain position, the connecting block 9 will drive the top block 10 to move. Since the connecting block 9 is arranged in the mounting groove 11 inside the top block 10 and is hinged to the top block 10, the top block 10 starts to change its angle as the connecting block 9 rises. At the same time, with the continuous action of the pressure, the bottom ring 4 slowly moves upward in the second oil chamber 3, jointly pushing the top block 10 up to the required height and angle. All the electrical equipment in this solution is powered by an external power supply.

[0024] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-stage telescopic oil cylinder for a dump truck, comprising a mounting seat (1) and a multi-stage oil cylinder mechanism, characterized in that: The mounting seat (1) has a first oil chamber (2) formed inside, a second oil chamber (3) formed on the upper side of the first oil chamber (2), the multi-stage oil cylinder mechanism comprising a bottom ring (4), a first piston rod (5) fixedly connected to the upper side of the bottom ring (4), a limiting ring (6) fixedly connected to the interior of the first piston rod (5), a blocking block (7) formed in the inner cavity of the first piston rod (5), a second piston rod (8) fixedly connected to the upper side of the blocking block (7), a connecting block (9) fixedly connected to the upper side of the second piston rod (8), a top block (10) hingedly connected to the outside of the connecting block (9), a mounting groove (11) formed inside the top block (10).

2. The multi-stage telescopic cylinder for dump trucks according to claim 1, characterized in that: The bottom ring (4) is arranged inside the second oil chamber (3), the blocking block (7) is slidably connected to the first piston rod (5), the second piston rod (8) is arranged inside the first piston rod (5), the first oil chamber (2) is communicated with the second oil chamber (3), and three top blocks (10) are arranged.

3. The multi-stage telescopic cylinder for dump trucks according to claim 1, characterized in that: The outside of the bottom ring (4) is fixedly connected to a first rubber ring (12), and the first rubber ring (12) is arranged inside the second oil chamber (3) and is slidably connected to the second oil chamber (3).

4. The multi-stage telescopic cylinder for dump trucks according to claim 1, characterized in that: A setting groove (13) is provided inside the first oil chamber (2), and a second rubber ring (14) is fixedly connected inside the setting groove (13).

5. The multi-stage telescopic cylinder for dump trucks according to claim 1, characterized in that: A rubber pad (15) is fixedly connected to the lower side of the mounting seat (1), and a texture groove (16) is provided on the lower surface of the rubber pad (15).

6. The multi-stage telescopic cylinder for dump trucks according to claim 1, characterized in that: A fixing plate (17) is fixedly connected to both sides of the mounting seat (1), and a fixing hole (18) is formed through the surface of the fixing plate (17).

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