Novel multi-stage oil cylinder internal supporting and limiting structure

Abstract

The utility model discloses a novel multi-stage oil cylinder internal supporting and limiting structure in the field of oil cylinders, which comprises a plurality of coaxially arranged cylinder barrel bodies, an inner peripheral cylinder barrel body and an adjacent outer peripheral cylinder barrel body are correspondingly arranged, and at least one group of supporting and limiting assembly is arranged between every two inner and outer adjacent cylinder barrel bodies. The supporting and limiting assembly comprises an annular sliding block and a limiting ring, the sliding block and the limiting ring are arranged on the corresponding cylinder barrel body in a sleeving mode, the lower end of the sliding block is in a wedge shape, the upper end of the limiting ring is arranged to be in a wedge shape corresponding to the sliding block, the lower end of the sliding block is attached to the upper end of the limiting ring, the sliding block presses the limiting ring below, and the outer diameter of the sliding block is larger than that of the limiting ring. The sliding block makes contact with the inner wall of the peripheral cylinder barrel, and a gap is reserved between the limiting ring and the peripheral cylinder barrel. The limiting ring is prevented from damaging the inner wall of the cylinder barrel due to deflection of the cylinder barrel body.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic cylinders, and specifically relates to a novel internal support and limiting structure for multi-stage hydraulic cylinders. Background Technology

[0002] In existing technologies, the internal piston structure of multi-stage cylinders typically includes a slider and a limiting ring. The slider radially supports each stage of the cylinder, while the limiting ring restricts the axial movement of the cylinder. Together, they ensure that the cylinder moves within the required stroke. In terms of hardness, the limiting ring > cylinder > slider. During cylinder operation, the slider is higher than the limiting ring and directly contacts the inner wall of the cylinder, while the limiting ring does not contact the cylinder; otherwise, it would damage the cylinder.

[0003] The current disadvantages of the internal piston structure of multi-stage cylinders are: 1. In the existing structure, the slider and the limiting ring are separated and have a certain distance. When the cylinder is subjected to a large eccentric load and the cylinder barrel deflects to one side, under the combined effects of deflection angle, cylinder barrel plastic deformation and slider wear, the limiting ring has a certain probability of contacting the cylinder barrel, thereby damaging the inner wall of the cylinder barrel; 2. The iron filings generated after the limiting ring damages the inner wall of the cylinder barrel will affect the entire hydraulic system, damage the sealing ring and cause oil leakage, and even damage important parts such as pumps and valves in the system. Utility Model Content

[0004] The purpose of this invention is to provide a novel internal support and limiting structure for a multi-stage hydraulic cylinder. The overall length of the cross-section of the new slider is increased, and the new limiting ring adopts a contact design with the slider to avoid damage to the inner wall of the cylinder caused by the cylinder body deflection.

[0005] The purpose of this utility model is achieved as follows: A novel internal support and limiting structure for a multi-stage hydraulic cylinder includes several coaxially arranged cylinder bodies. The inner circumferential cylinder body is correspondingly arranged with the adjacent outer circumferential cylinder body. At least one set of support and limiting components is provided between each pair of adjacent inner and outer cylinder bodies. The support and limiting components include an annular slider and a limiting ring. The slider and the limiting ring are both sleeved on the corresponding cylinder body. The lower end of the slider is wedge-shaped, and the upper end of the limiting ring is wedge-shaped corresponding to the slider. The lower end of the slider is fitted with the upper end of the limiting ring, and the slider presses down on the lower limiting ring. The outer diameter of the slider is larger than the outer diameter of the limiting ring. The slider is in contact with the inner wall of the outer circumferential cylinder body, and a gap is left between the limiting ring and the outer circumferential cylinder body.

[0006] This invention is used in multi-stage hydraulic cylinders. When the multi-stage hydraulic cylinder is working, when the pressurized oil enters from the rodless chamber, the cylinder body with the largest effective area of ​​the piston cylinder begins to extend. When it reaches the end point, the cylinder body with the second largest effective area of ​​the piston cylinder begins to extend. The extension sequence of the telescopic piston cylinder is from large to small, which can obtain a long working stroke. The smaller the effective area of ​​the extended cylinder, the faster the extension speed.

[0007] Compared with the prior art, the beneficial effects of this utility model are as follows: The slider of this utility model adopts an asymmetrical design, the overall length of the slider cross-section is increased, the shoulder wall thickness at both ends of the slider is thickened instead of sharp corners, and the new limiting ring adopts a contact design with the slider; one end of the slider adopts a wedge design to cooperate with the limiting ring which is designed to wedge itself, so as to stably press the limiting ring under the slider. The extended slider has a larger contact area with the inner wall of the cylinder, increasing the resistance to eccentric load and reducing the deflection angle generated when subjected to eccentric load. The slider and the limiting ring adopt a contact design, and the slider presses the limiting ring firmly. Even if deflection occurs, the slider will still contact the inner wall of the cylinder before the limiting ring, avoiding damage.

[0008] As a further improvement of this utility model, the inner circumference of the slider is provided with a mounting part that is embedded in the inner circumferential cylinder body, and the cylinder body is provided with an embedded mounting groove corresponding to the mounting part. The mounting groove is used to mount the slider.

[0009] As a further improvement of this utility model, the inner circumference of the limiting ring is provided with a second mounting part that is embedded in the inner circumferential cylinder body, and the cylinder body is provided with a second mounting groove corresponding to the second mounting part. The axial length of the second mounting part is greater than the axial length of the limiting ring, and the second mounting groove is used to install the limiting ring.

[0010] As a further improvement of this invention, the axial length of the slider is greater than the axial length of the limiting ring. The overall length of the slider cross-section is increased, reducing the possibility of cylinder deflection.

[0011] As a further improvement of this utility model, the limiting ring is correspondingly provided with a stop ring on the inner wall of the outer peripheral cylinder. The stop ring limits the limiting ring, preventing the limiting ring from directly impacting and damaging the inner wall of the cylinder.

[0012] As a further improvement of this utility model, the cylinder body located on the outer periphery is the outer cylinder body, and the remaining cylinder bodies are all telescopic piston cylinders. Two sets of support and limiting components are provided between each pair of adjacent inner and outer piston cylinders, and the two sets of support and limiting components are arranged symmetrically vertically. The two sets of support and limiting components make the telescopic movement of the cylinders more stable and smooth. With the position of the outer cylinder body unchanged, each piston cylinder can extend outward and retract in sequence. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 for Figure 1 A magnified view of a portion of the image.

[0015] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0016] Figure 4This is a schematic diagram of the external structure of the multi-stage hydraulic cylinder of this utility model.

[0017] Among them, 1 is the cylinder body, 2 is the slider, 2a is the mounting part one, 3 is the limiting ring, 3a is the mounting part two, 4 is the embedded mounting groove one, 5 is the embedded mounting groove two, and 6 is the stop ring. Detailed Implementation

[0018] like Figure 1-4 As shown, a novel internal support and limiting structure for a multi-stage hydraulic cylinder includes several coaxially arranged cylinder bodies 1. The inner circumferential cylinder body 1 is correspondingly arranged with the adjacent outer circumferential cylinder body 1. At least one set of support and limiting components is provided between each pair of adjacent inner and outer cylinder bodies 1. The support and limiting components include annular sliders 2 and limiting rings 3. Both sliders 2 and limiting rings 3 are sleeved on the corresponding cylinder bodies 1. The lower end of slider 2 is wedge-shaped, and the upper end of limiting ring 3 is wedge-shaped corresponding to slider 2. The lower end of slider 2 is fitted with the upper end of limiting ring 3, and slider 2 presses against the lower limiting ring 3. The outer diameter of slider 2 is larger than the outer diameter of limiting ring 3. Slider 2 is in contact with the inner wall of the outer circumferential cylinder body 1, and the limiting ring 3 is spaced from the outer circumferential cylinder body 1.

[0019] The slider 2 has a mounting portion 2a embedded in the inner circumference of the inner cylinder body 1, and a mounting groove 4 is formed around the cylinder body 1 corresponding to the mounting portion 2a. The mounting groove is used to mount the slider 2. The limiting ring 3 has a mounting portion 3a embedded in the inner circumference of the inner cylinder body 1, and a mounting groove 5 is formed around the cylinder body 1 corresponding to the mounting portion 3a. The axial length of the mounting portion 3a is greater than the axial length of the limiting ring 3, and the mounting groove 5 is used to mount the limiting ring 3. The axial length of the slider 2 is greater than the axial length of the limiting ring 3. The overall length of the slider 2 cross-section is increased, reducing the possibility of cylinder deflection.

[0020] The limiting ring 3 is correspondingly provided with the stop ring 6 on the inner wall of the outer peripheral cylinder body 1. The stop ring 6 limits the limiting ring 3, preventing the limiting ring 3 from directly impacting the inner wall of the cylinder and causing damage.

[0021] The outer cylinder body 1 located on the outer periphery is the outer cylinder body, and the remaining cylinder bodies 1 are all telescopic piston cylinders. Two sets of support and limiting components are provided between each pair of adjacent inner and outer piston cylinders, and the two sets of support and limiting components are arranged symmetrically vertically. The two sets of support and limiting components make the telescopic movement of the cylinder body more stable and smooth.

[0022] This invention is used in multi-stage hydraulic cylinders. When the multi-stage hydraulic cylinder is working, when the pressurized oil enters from the rodless chamber, the cylinder body 1 with the largest effective area of ​​the piston cylinder begins to extend. When it reaches the end point, the cylinder body 1 with the second largest effective area of ​​the piston cylinder begins to extend. The extension sequence of the telescopic piston cylinder is from large to small, which can obtain a long working stroke. The smaller the effective area of ​​the extended cylinder, the faster the extension speed.

[0023] The advantages of this invention are as follows: The slider 2 adopts an asymmetrical design, with an increased overall length in its cross-section. The shoulder walls at both ends of the slider 2 are thickened instead of being sharp corners. The novel limiting ring 3 adopts a contact-type design with the slider 2. One end of the slider 2 adopts a wedge-shaped design to cooperate with the mutually wedge-shaped limiting ring 3, stably pressing the limiting ring 3 under the slider 2. The extended slider 2 has a larger contact area with the inner wall of the cylinder, increasing its resistance to eccentric loads and reducing the deflection angle under eccentric loads. The contact-type design of the slider 2 and the limiting ring 3 ensures that even if deflection occurs, the slider 2 will still contact the inner wall of the cylinder before the limiting ring 3, preventing damage. This multi-stage hydraulic cylinder internal support and limiting structure is not limited to multi-stage cylinders; it can be used for various long-stroke single-acting hydraulic cylinders, reducing internal cylinder scoring damage and improving service life.

[0024] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A novel internal support and limiting structure for a multi-stage hydraulic cylinder, comprising several coaxially arranged cylinder bodies, with inner circumferential cylinder bodies corresponding to adjacent outer circumferential cylinder bodies, and at least one set of support and limiting components provided between each pair of adjacent inner and outer cylinder bodies, characterized in that... The support and limiting assembly includes an annular slider and a limiting ring. Both the slider and the limiting ring are sleeved on the corresponding cylinder body. The lower end of the slider is wedge-shaped, and the upper end of the limiting ring is also wedge-shaped. The lower end of the slider fits against the upper end of the limiting ring, and the slider presses down on the lower limiting ring. The outer diameter of the slider is larger than the outer diameter of the limiting ring. The slider contacts the inner wall of the outer cylinder body, and a gap is left between the limiting ring and the outer cylinder body.

2. The novel multi-stage hydraulic cylinder internal support and limiting structure according to claim 1, characterized in that, The slider has an inner circumference with a mounting part that is embedded in the inner circumference cylinder body, and the cylinder body has an embedded mounting groove that is circumferentially formed around the mounting part.

3. A novel internal support and limiting structure for a multi-stage hydraulic cylinder according to claim 1 or 2, characterized in that, The inner circumference of the limiting ring is provided with a second mounting part that is embedded in the inner circumferential cylinder body, and the cylinder body is provided with a second mounting groove that is circumferentially formed around the second mounting part.

4. A novel internal support and limiting structure for a multi-stage hydraulic cylinder according to claim 1 or 2, characterized in that, The axial length of the slider is greater than the axial length of the limiting ring.

5. A novel internal support and limiting structure for a multi-stage hydraulic cylinder according to claim 1 or 2, characterized in that, The limiting ring is provided in correspondence with the stop ring on the inner wall of the outer peripheral cylinder.

6. A novel internal support and limiting structure for a multi-stage hydraulic cylinder according to claim 1 or 2, characterized in that, The cylinder body located on the outer periphery is the outer cylinder body, and the remaining cylinder bodies are all telescopic piston cylinders. Two sets of support and limiting components are provided between two adjacent piston cylinders, and the two sets of support and limiting components are arranged symmetrically above and below.

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