Gas spring for refrigeration storage forklift

Abstract

The air spring comprises a cylinder body and a piston rod inserted in a cavity of the cylinder body, a piston matched with the inner wall of the cavity of the cylinder body is installed at the end of the piston rod, and a first silica gel sealing piece and a second silica gel sealing piece which are located at the upper end of the piston are installed in the cylinder body. A cavity, located at the lower end of the piston, of the cylinder body is filled with an oil-gas mixture. The gas spring is simple in structure, under the action of the oil-gas mixture and the silica gel sealing piece, it can be guaranteed that the gas spring can be normally used in the ultralow-temperature cold storage environment, and the phenomenon that hydraulic oil is frozen cannot happen.

Description

Technical Field

[0001] The utility model relates to the technical field of gas springs, in particular to a gas spring for a cold storage forklift. Background Art

[0002] Gas springs are widely used in forklifts, such as hoods, box covers, and side doors. Conventional gas springs cannot meet the requirements of cold storage forklifts in low-temperature environments of cold storage.

[0003] Conventional gas springs can only be used in normal temperature environments. In low temperature cold storage environments, their service life will be severely shortened. For example, according to tests, in a -30°C environment, the service life of conventional gas springs is shortened from 25,000 times in normal environments to only 2,000 times in cold storage. This seriously affects the use of cold storage forklifts. Therefore, a gas spring for cold storage forklifts is proposed. Utility Model Content

[0004] The utility model aims to provide a gas spring for a cold storage forklift to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a gas spring for a cold storage forklift, comprising a cylinder body and a piston rod inserted into the cylinder body cavity, a piston adapted to the inner wall of the cylinder body cavity is installed at the end of the piston rod, a first silicone seal and a second silicone seal located at the upper end of the piston are installed inside the cylinder body, and the cavity of the cylinder body located at the lower end of the piston is filled with an oil-gas mixture.

[0006] As a further solution of the utility model: a guide sleeve is provided inside the cylinder cavity, and a through hole for the piston rod to pass through is provided in the middle of the guide sleeve.

[0007] As a further solution of the utility model: the lower end surface of the guide sleeve is provided with a groove for placing the first silicone seal, and the depth of the groove is the same as the thickness of the first silicone seal.

[0008] As a further solution of the present invention: the outer wall of the second silicone seal is connected to the inner wall of the cavity of the cylinder body, and the inner wall of the second silicone seal is adapted to the piston rod.

[0009] As a further solution of the utility model: a gasket is arranged in the cylinder body between the second silicone seal and the piston.

[0010] As a further solution of the utility model: the number of the gaskets is two, and a sealed cavity is formed between the two gaskets.

[0011] As a further solution of the utility model: the cylinder body is located between the two gaskets and has a positioning boss which is recessed inward in an arc shape.

[0012] As a further solution of the utility model: a heating and heat-insulating layer is provided on the outside of the cylinder body.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. Under the action of oil-gas mixture and silicone seals, the gas spring can be used normally in ultra-low temperature cold storage environment without the hydraulic oil freezing.

[0015] 2. By setting the gasket, the piston can be prevented from directly contacting the silicone seal when rebounding, causing the silicone seal to loosen and affecting the sealing of the cylinder body. The gasket can also play a certain buffering role, reducing the wear of the piston, thereby increasing the service life of the cylinder body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a cross-sectional schematic diagram of a gas spring for a cold storage forklift of the utility model;

[0017] In the figure: 1. piston rod; 2. piston; 3. positioning boss; 4. cylinder body; 5. guide sleeve; 6. first silicone seal; 7. second silicone seal; 8. oil-gas mixture; 9. gasket. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] See also Figure 1 In an embodiment of the utility model, a gas spring for a cold storage forklift includes a cylinder body 4 and a piston rod 1 inserted into the cavity of the cylinder body 4, a piston 2 adapted to the inner wall of the cavity of the cylinder body 4 is installed at the end of the piston rod 1, a first silicone seal 6 and a second silicone seal 7 located at the upper end of the piston 2 are installed inside the cylinder body 4, and the cavity of the cylinder body 4 located at the lower end of the piston 2 is filled with an oil-gas mixture 8.

[0020] Specifically, the oil-gas mixture 8 is a mixture of inert gas and aviation hydraulic oil. After the two are mixed, compared with the ordinary hydraulic oil used in conventional gas springs, it has an extremely low pour point of -50°C. The viscosity is low in low temperature environment and it will not freeze. The cylinder body 4 is in a high pressure state, which can provide extension force for the piston 2; secondly, the first silicone seal 6 and the second silicone seal 7 play a role in preventing oil leakage and dust from entering the cylinder body 4. The material is silicone rubber. The gas spring using silicone seals can be used in the temperature range of -60°C to 200°C, and the performance is stable. After 1000 cycles of life test at low temperature of -60°C, the total attenuation of the nominal force of the low-temperature gas spring is less than 2%. After 18,000 cycles of life test at normal temperature, the total attenuation of the nominal force of the low-temperature gas spring is less than 3%. It far exceeds the standard requirement level.

[0021] See also Figure 1 In one embodiment, in order to ensure that the piston rod 1 always maintains a vertical movement state during movement, in this embodiment, preferably, a guide sleeve 5 is provided inside the cavity of the cylinder body 4, and a through hole for the piston rod 1 to pass through is provided in the middle of the guide sleeve 5, and the length direction of the through hole is vertically opened from top to bottom, so when the piston rod 1 moves in the through hole, the piston rod 1 will not tilt to one side.

[0022] See also Figure 1 In one embodiment, in this embodiment, preferably, a groove for placing the first silicone seal 6 is opened on the lower end surface of the guide sleeve 5, and the depth of the groove is the same as the thickness of the first silicone seal 6, the outer wall of the second silicone seal 7 is connected to the inner wall of the cavity of the cylinder body 4, and the inner wall of the second silicone seal 7 is adapted to the piston rod 1. When the first silicone seal 6 is placed into the groove, the end face of the first silicone seal 6 is flush with the end face of the guide sleeve 5, which is convenient for the assembly of the second silicone seal 7, and secondly, it is more conducive to the cooperation between the first silicone seal 6 and the second silicone seal 7, so that it has better sealing performance.

[0023] See also Figure 1 In one embodiment, in order to prevent the second silicone seal 7 from contacting the piston 2 during movement and affecting the sealing of the cylinder body 4 by the first silicone seal 6 and the second silicone seal 7, in this embodiment, preferably, a gasket 9 is provided in the cylinder body 4 between the second silicone seal 7 and the piston 2. The number of gaskets 9 is two, and a sealed cavity is formed between the two gaskets 9. The cylinder body 4 is located between the two gaskets 9 and has a positioning boss 3 that is recessed inward in an arc shape to prevent the two gaskets 9 from fitting together. When the piston 2 rebounds under high pressure, the piston 2 first contacts the gasket 9, and the gasket 9 buffers the piston 2 to prevent it from directly contacting the second silicone seal 7 during rebound, causing the second silicone seal 7 to loosen and affecting the sealing of the cylinder body 4.

[0024] See also Figure 1 In one embodiment, in this embodiment, preferably, a heating and heat-insulating layer 10 is provided on the outside of the cylinder body 4. When the gas spring enters the ultra-low temperature cold storage and the temperature inside the cylinder is very low, the electric heating function can be turned on to ensure the normal use of the silicone seal and extend the service life of the gas spring.

[0025] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0026] Therefore, the above description is only a preferred embodiment of the present application and is not intended to limit the scope of implementation of the present application; that is, all equivalent changes made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. A gas spring for a cold storage forklift, comprising a cylinder (4) and a piston rod (1) inserted into the cavity of the cylinder (4), characterized in that: A piston (2) adapted to the inner wall of the cylinder body (4) is installed at the end of the piston rod (1); a first silicone seal (6) and a second silicone seal (7) located at the upper end of the piston (2) are installed inside the cylinder body (4); and a cavity of the cylinder body (4) located at the lower end of the piston (2) is filled with an oil-gas mixture (8).

2. The gas spring for cold storage forklift according to claim 1, characterized in that: A guide sleeve (5) is provided inside the cavity of the cylinder body (4), and a through hole for the piston rod (1) to pass through is provided in the middle of the guide sleeve (5).

3. The gas spring for cold storage forklift according to claim 2, characterized in that: The lower end surface of the guide sleeve (5) is provided with a groove for placing the first silicone seal (6), and the depth of the groove is the same as the thickness of the first silicone seal (6).

4. The gas spring for cold storage forklift according to claim 1, characterized in that: The outer wall of the second silicone seal (7) is connected to the inner wall of the cavity of the cylinder body (4), and the inner wall of the second silicone seal (7) is adapted to the piston rod (1).

5. The gas spring for cold storage forklift according to claim 1, characterized in that: A gasket (9) is provided in the cylinder body (4) between the second silicone seal (7) and the piston (2).

6. The gas spring for cold storage forklift according to claim 5, characterized in that: The number of the gaskets (9) is two, and a sealed cavity is formed between the two gaskets (9).

7. The gas spring for cold storage forklift according to claim 1, characterized in that: The cylinder body (4) is provided with a positioning boss (3) in an arc-shaped depression toward the inside at a position between the two gaskets (9).

8. The gas spring for cold storage forklift according to claim 1, characterized in that: The outside of the cylinder body (4) is provided with a heating and heat-insulating layer (10).

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