Pressure relief prevention structure for hydraulic cylinder of automobile shear type lifting machine

Abstract

The utility model discloses an anti-pressure-relief structure for a hydraulic cylinder of an automobile shear-type lifting machine, which belongs to the technical field of anti-pressure-relief of hydraulic cylinders and comprises a hydraulic cylinder, an anti-pressure-relief device is arranged in the hydraulic cylinder and comprises a sealing ring, an empty groove is formed in the sealing ring, and an anti-pressure-relief valve is arranged in the empty groove. A plurality of mounting holes are formed in the inner wall of the empty groove; according to the hydraulic cylinder, through the arrangement of the sealing ring, the spring and the limiting ring, when the hydraulic cylinder is used, the spring in the sealing ring between the piston rod and the hydraulic cylinder body is in a compressed state, acting force exists at the two ends of the spring, and the acting force acts on the piston rod and the hydraulic cylinder body at the same time; the piston rod and the hydraulic cylinder can be connected more tightly, the limiting ring can limit and guide the piston rod so that the piston rod cannot shake easily, and the guide rod can guide the piston rod so that the piston rod can keep linear motion.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic cylinder anti-pressure relief, and particularly relates to an anti-pressure relief structure for a hydraulic cylinder of an automotive scissor lift. Background Art

[0002] The anti-pressure relief of the hydraulic cylinder mainly prevents the pressure in the hydraulic system from dropping or failing to reach the expected pressure by taking a series of measures, so as to ensure the normal operation of the hydraulic cylinder and the stability of the system. This involves the maintenance, inspection and correct use of the hydraulic cylinder and its related components to ensure the tightness and integrity of the hydraulic system.

[0003] The seal at the piston rod of the existing hydraulic cylinder is easily damaged or fails due to the force of the inclined compression from the piston rod. Or when the piston rod extends and retracts for external use, some substances may adhere to the surface of the piston rod. When these substances come into contact and friction with the seal, the seal may be damaged or fail, resulting in a gap between the piston rod and the seal, and further causing the hydraulic cylinder to leak easily. Therefore, an anti-pressure relief structure for a hydraulic cylinder of an automotive scissor lift is needed to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an anti-pressure relief structure for a hydraulic cylinder of an automotive scissor lift to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the utility model provides the following technical solution: an anti-pressure relief structure for a hydraulic cylinder of an automotive scissor lift, including a hydraulic cylinder body. An anti-pressure relief device is arranged inside the hydraulic cylinder body. The anti-pressure relief device includes a sealing ring. An empty groove is opened inside the sealing ring. A plurality of mounting holes are opened on the inner wall of the empty groove. A spring is fixedly connected to the inner wall of the mounting hole. A connecting circular plate is fixedly connected to the surface of the spring. A limiting ring is fixedly connected to the side of the sealing ring away from the hydraulic cylinder body. Two connecting columns are fixedly connected to the inside of the limiting ring. A circular scraping plate is fixedly connected to the surface of the two connecting columns. Two limiting blocks are fixedly connected to the surface of the hydraulic cylinder body. A guide rod is slidably connected to the inside of the two limiting blocks. A connecting block is fixedly connected to one side of the two guide rods. A protective cover is fixedly connected to one side of the two connecting blocks.

[0006] By setting the above structure, when the hydraulic cylinder is in use, the spring inside the sealing ring between the piston rod and the hydraulic cylinder body will be in a compressed state. There are acting forces at both ends of the spring, one acting on the piston rod and the other acting on the hydraulic cylinder body, enabling a tighter connection to be established between the piston rod and the hydraulic cylinder body. At the same time, the limiting ring can provide limiting and guiding functions for the piston rod, preventing the piston rod from shaking easily. The guiding rod can provide a guiding function for the piston rod, enabling the piston rod to maintain linear motion, thereby reducing the situation where the shaking of the piston rod generates compressive acting forces on the sealing ring and causing damage to the sealing ring. At the same time, it can also avoid the situation where the damage or even destruction of the sealing ring leads to the generation of gaps between the piston rod and the sealing ring.

[0007] As a preferred solution, a piston is provided inside the hydraulic cylinder body. A piston rod is provided on one side of the piston, and the piston rod slides on the inner wall of the hydraulic cylinder body.

[0008] As a preferred solution, an oil inlet is provided inside the hydraulic cylinder body near the outlet of the piston rod, and an oil outlet is provided inside the hydraulic cylinder body away from the outlet of the piston rod.

[0009] As a preferred solution, the sealing ring is fixedly connected inside the hydraulic cylinder body, and the sealing ring is in contact with the piston rod.

[0010] As a preferred solution, the spring is located inside the connecting circular plate, and the connecting circular plate can connect the three springs.

[0011] As a preferred solution, the limiting ring is sleeved on the surface of the piston rod.

[0012] As a preferred solution, the inner diameter of the protective cover is larger than the diameter of the limiting ring.

[0013] By setting the circular scraping plate and the protective cover, during the process of the piston rod retracting into the hydraulic cylinder body, the circular scraping plate will scrape off some substances attached to the surface of the piston rod, thereby reducing the situation where these substances come into direct contact with the sealing ring and cause friction, resulting in damage or even destruction of the sealing ring. At the same time, it can also isolate these substances outside the hydraulic cylinder body to the greatest extent. When the piston rod moves into the hydraulic cylinder body, the protective cover will cover the limiting ring, the piston rod, and the sealing ring and play a protective role.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] In this utility model, by providing a sealing ring, a spring and a limiting ring, when the hydraulic cylinder is in use, the spring inside the sealing ring between the piston rod and the hydraulic cylinder body will be in a compressed state. There are acting forces at both ends of the spring, one acting on the piston rod and the other acting on the hydraulic cylinder body, enabling a tighter connection to be established between the piston rod and the hydraulic cylinder body, and the sealing performance will also be improved. At the same time, the limiting ring can provide the functions of limiting and guiding for the piston rod, so that the piston rod will not shake easily, and the guiding rod can provide the guiding function for the piston rod, enabling the piston rod to maintain linear motion. Furthermore, it can reduce the situation where the piston rod shakes and generates a compressive acting force on the sealing ring, resulting in damage to the sealing ring. At the same time, it can also avoid the situation where the sealing ring is damaged or even destroyed, leading to a gap between the piston rod and the sealing ring.

[0016] In this utility model, by providing a circular scraping plate and a protective cover, during the process of the piston rod contracting into the hydraulic cylinder body, the circular scraping plate will scrape off some substances adhering to the surface of the piston rod, thereby reducing the situation where these substances come into direct contact with the sealing ring and cause friction, resulting in damage or even destruction of the sealing ring. At the same time, it can also isolate these substances from the outside of the hydraulic cylinder body to the greatest extent. When the piston rod moves into the hydraulic cylinder body, the protective cover will cover the limiting ring, the piston rod and the sealing ring and play a protective role. Brief Description of the Drawings

[0017] Figure 1 is a schematic structural diagram of the front three-dimensional view of this utility model;

[0018] Figure 2 is a schematic structural diagram of the front three-dimensional view of the hydraulic cylinder body of this utility model;

[0019] Figure 3 is a schematic structural diagram of the sealing ring of this utility model;

[0020] Figure 4 is a schematic structural diagram of the anti-pressure-relief device of this utility model;

[0021] Figure 5 is a schematic structural diagram of the front cross-section of this utility model.

[0022] In the figure: 1. Hydraulic cylinder body; 2. Piston; 3. Piston rod; 4. Oil inlet; 5. Oil outlet; 6. Anti-pressure-relief device; 601. Sealing ring; 602. Empty groove; 603. Installation hole; 604. Spring; 605. Connecting circular plate; 606. Limiting ring; 607. Connecting column; 608. Circular scraping plate; 609. Limiting block; 610. Guiding rod; 611. Connecting block; 612. Protective cover. Detailed Description of the Preferred Embodiments

[0023] The following further describes this utility model in conjunction with embodiments.

[0024] The following embodiments are used to illustrate the present utility model, but cannot be used to limit the protection scope of the present utility model. The conditions in the embodiments can be further adjusted according to specific conditions. Under the premise of the concept of the present utility model, simple improvements to the method of the present utility model all belong to the scope required to be protected by the present utility model.

[0025] Please refer to Figures 1-5 , the present utility model provides an anti-pressure-relief structure for a hydraulic cylinder of an automotive scissor lift, which includes a hydraulic cylinder body 1. An anti-pressure-relief device 6 is arranged inside the hydraulic cylinder body 1. The anti-pressure-relief device 6 includes a sealing ring 601. An empty groove 602 is opened inside the sealing ring 601. A plurality of mounting holes 603 are opened on the inner wall of the empty groove 602. A spring 604 is fixedly connected to the inner wall of the mounting hole 603. A connecting circular plate 605 is fixedly connected to the surface of the spring 604. A limiting ring 606 is fixedly connected to the side of the sealing ring 601 away from the hydraulic cylinder body 1. Two connecting columns 607 are fixedly connected to the inside of the limiting ring 606. A circular scraping plate 608 is fixedly connected to the surface of the two connecting columns 607. Two limiting blocks 609 are fixedly connected to the surface of the hydraulic cylinder body 1. A guide rod 610 is slidably connected to the inside of the two limiting blocks 609. A connecting block 611 is fixedly connected to one side of the two guide rods 610. A protective cover 612 is fixedly connected to one side of the two connecting blocks 611. By setting the sealing ring 601, the spring 604 and the limiting ring 606, when the hydraulic cylinder is in use, the spring 604 inside the sealing ring 601 between the piston rod 3 and the hydraulic cylinder body 1 will be in a compressed state. There are acting forces at both ends of the spring 604, one acting on the piston rod 3 and the other acting on the hydraulic cylinder body 1, so that a tighter connection can be established between the piston rod 3 and the hydraulic cylinder body 1. At the same time, the limiting ring 606 can provide the functions of limiting and guiding for the piston rod 3, so that the piston rod 3 will not shake easily. The guide rod 610 can provide the guiding function for the piston rod 3, so that the piston rod 3 can maintain linear motion. Furthermore, the situation that the piston rod 3 shakes and generates a pressing acting force on the sealing ring 601, resulting in damage to the sealing ring 601, can be reduced. At the same time, the situation that the sealing ring 601 is damaged or even damaged, resulting in a gap between the piston rod 3 and the sealing ring 601, can also be avoided.

[0026] A piston 2 is arranged inside the hydraulic cylinder body 1. A piston rod 3 is arranged on one side of the piston 2. The piston rod 3 slides on the inner wall of the hydraulic cylinder body 1.

[0027] An oil inlet 4 is arranged inside the hydraulic cylinder body 1 near the outlet of the piston rod 3. An oil outlet 5 is arranged inside the hydraulic cylinder body 1 away from the outlet of the piston rod 3.

[0028] The sealing ring 601 is fixedly connected inside the hydraulic cylinder body 1 and is in contact with the piston rod 3.

[0029] The spring 604 is located inside the connecting circular plate 605, and the connecting circular plate 605 can connect the three springs 604.

[0030] The limit ring 606 is sleeved on the surface of the piston rod 3.

[0031] The inner diameter of the protective cover 612 is larger than the diameter of the limit ring 606. By providing the circular scraper 608 and the protective cover 612, during the process of the piston rod 3 retracting into the hydraulic cylinder body 1, the circular scraper 608 will scrape some substances attached to the surface of the piston rod 3, thereby reducing the direct contact and friction between these substances and the sealing ring 601, which may cause damage or even destruction of the sealing ring 601. At the same time, these substances can be isolated from the outside of the hydraulic cylinder body 1 to the greatest extent. When the piston rod 3 moves into the hydraulic cylinder body 1, the protective cover 612 will cover the limit ring 606, the piston rod 3, and the sealing ring 601 and play a protective role.

[0032] The working principle and usage process of the present utility model: When hydraulic oil is fed into the hydraulic cylinder body 1 from the oil inlet 4, the piston 2 will push the piston rod 3 to move inside the hydraulic cylinder body 1, so that the piston rod 3 can extend from the inside of the hydraulic cylinder body 1. At this time, the spring 604 inside the sealing ring 601 between the piston rod 3 and the hydraulic cylinder body 1 is in a compressed state, and there are acting forces at both ends of the spring 604. One side acts on the piston rod 3, and the other side acts on the hydraulic cylinder body 1, enabling a closer connection to be established between the piston rod 3 and the hydraulic cylinder body 1. When the piston rod 3 moves to the outside of the hydraulic cylinder body 1, the protective cover 612 fixedly connected to the top of the piston rod 3 will also move along with the movement of the piston rod 3. At the same time, the connecting block 611 fixedly connected thereto will also move accordingly, and the guide rod 610 fixedly connected to the connecting block 611 will also move accordingly. At the same time, the guide rod 610 will also slide inside the limit block 609. At this time, the limit ring 606 can provide the functions of limiting and guiding for the piston rod 3, so that the piston rod 3 will not shake easily and can maintain linear motion. During the process of the piston rod 3 retracting into the hydraulic cylinder body 1, the circular scraper 608 will scrape some substances attached to the surface of the piston rod 3. When the piston rod 3 moves into the hydraulic cylinder body 1, the protective cover 612 will cover the limit ring 606, the piston rod 3, and the sealing ring 601 inside and play a protective role.

[0033] Although the embodiments of the present utility model have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A pressure relief structure for a hydraulic cylinder of a scissor lift for a vehicle, comprising a hydraulic cylinder (1), characterized in that: The hydraulic cylinder (1) is provided with an anti-pressure relief device (6), the anti-pressure relief device (6) comprising a sealing ring (601), the sealing ring (601) having an empty groove (602) formed therein, the inner wall of the empty groove (602) having a plurality of mounting holes (603), the inner wall of the mounting hole (603) being fixedly connected with a spring (604), the surface of the spring (604) being fixedly connected with a connecting circular plate (605), and the sealing ring (601) being fixedly connected with a limiting stopper on a side away from the hydraulic cylinder (1). A ring (606) is provided, wherein two connecting columns (607) are fixedly connected inside the limiting ring (606), and circular scrapers (608) are fixedly connected to the surfaces of the two connecting columns (607). Two limiting blocks (609) are fixedly connected to the surface of the hydraulic cylinder (1), and guide rods (610) are slidably connected inside the two limiting blocks (609), and a connecting block (611) is fixedly connected to one side of the two guide rods (610), and a protective cover (612) is fixedly connected to one side of the two connecting blocks (611).

2. The anti-pressure relief structure of the hydraulic cylinder of a car scissor lift according to claim 1, characterized in that: A piston (2) is provided inside the hydraulic cylinder (1), a piston rod (3) is provided on one side of the piston (2), and the piston rod (3) slides on the inner wall of the hydraulic cylinder (1).

3. The anti-pressure relief structure of the hydraulic cylinder of a car scissor lift according to claim 2, characterized in that: An oil inlet (4) is provided inside the hydraulic cylinder (1) close to the outlet of the piston rod (3), and an oil outlet (5) is provided inside the hydraulic cylinder (1) away from the outlet of the piston rod (3).

4. The anti-pressure relief structure of the hydraulic cylinder of a car scissor lift according to claim 1, characterized in that: The sealing ring (601) is fixedly connected to the inside of the hydraulic cylinder (1), and the sealing ring (601) is in close contact with the piston rod (3).

5. The anti-pressure relief structure of the hydraulic cylinder of a car scissor lift according to claim 1, characterized in that: The spring (604) is located inside the connecting circular plate (605), and the connecting circular plate (605) can connect the three springs (604).

6. The anti-pressure relief structure of the hydraulic cylinder of a car scissor lift according to claim 1, characterized in that: The limiting ring (606) is sleeved on the surface of the piston rod (3).

7. The anti-pressure relief structure of the hydraulic cylinder of a car scissor lift according to claim 1, characterized in that: The inner diameter of the protective cover (612) is greater than the diameter of the limiting ring (606).

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