Hydraulic cylinder with deformable piston sealing ring and hoist thereof

Abstract

The hydraulic cylinder with the deformable piston sealing ring comprises a cylinder body, a front cover is arranged at one end of the cylinder body, a piston rod penetrates out of the front cover, and an oil inlet is formed in the position, close to the front cover, of the cylinder body; a sunken clamping table is arranged at the outer ring position, located at one end of the rod cavity, of the piston, and a sealing ring is clamped on the clamping table and used for sealing the piston and the cylinder body; a cavity is formed in the sealing ring; when the piston rod completely extends out, the oil inlet directly faces the cavity; and when oil enters the oil inlet, the sealing ring is compressed under the action of the cavity, so that the oil inlet is communicated with the rod cavity. According to the cylinder cover, the function that the oil inlet is formed in the cylinder body and can stably drive the piston to move is achieved, the structure of the cylinder cover is simplified, the production difficulty of the cylinder cover is reduced, the thickness of the cylinder cover is shortened, and materials and cost are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of hoists, in particular to a hydraulic cylinder with a deformable piston sealing ring and a hoist thereof. Background Art

[0002] The oil cylinder is generally equipped with two oil ports, the oil outlet is set in the rodless chamber, and the oil inlet is set in the rod chamber. The oil supply is switched between the oil outlet and the oil inlet to achieve the extension and retraction of the piston rod.

[0003] The oil inlet is usually set on the front cover, such as Figure 5 As shown, this design requires the setting of an L-shaped oil circuit in the front cover to ensure that the hydraulic oil can enter the rod chamber directly opposite the piston, thereby stably pushing the piston to move. However, this design has obvious defects. First, the setting of the L-shaped oil circuit makes the structure of the front cover complicated and the processing difficulty increases, which not only increases the manufacturing cost, but may also cause errors in the processing process and affect the performance of the cylinder. Secondly, in order to accommodate the L-shaped oil circuit, the front cover needs to provide sufficient setting space, which inevitably causes waste of materials and is not conducive to environmental protection and cost control. Utility Model Content

[0004] In order to solve the technical problems in the background technology, the utility model discloses a hydraulic cylinder with a deformable piston sealing ring and a hoist thereof.

[0005] The utility model provides a hydraulic cylinder with a deformable piston sealing ring, comprising a cylinder body, one end of which is provided with a front cover, a piston rod passing through the front cover, and an oil inlet being provided near the front cover of the cylinder body;

[0006] A recessed clamping platform is provided on the outer ring of the piston at one end of the rod cavity, and a sealing ring is clamped on the clamping platform to seal the piston and the cylinder body;

[0007] A cavity is provided in the sealing ring;

[0008] When the piston rod is fully extended, the oil inlet faces the cavity; when oil enters the oil inlet, the sealing ring is compressed under the action of the cavity, so that the oil inlet is connected with the rod cavity.

[0009] The setting of the cavity provides space for the sealing ring to deform. When oil enters the oil inlet, the oil pressure can drive the sealing ring to compress, so that the sealing ring moves away from the inner wall of the cylinder body, connecting the oil inlet and the rod chamber; when the hydraulic oil flows into the rod chamber from between the sealing ring and the inner wall of the cylinder body, the oil pressure in the rod chamber increases, driving the piston to move toward the bottom of the cylinder; it can be seen that the utility model realizes the function of arranging the oil inlet on the cylinder body and stably driving the piston to move, which not only simplifies the structure of the cylinder head and reduces the difficulty of producing the cylinder head, but also shortens the thickness of the cylinder head, saving materials and costs.

[0010] The position of the cavity directly affects the stability of the connection between the oil inlet and the rod cavity. If the cavity is set at a position far away from the rod cavity, the sealing ring is likely to deform, but the oil inlet and the rod cavity are still not connected. Based on this, further improvement is that: the cavity is located close to the rod cavity.

[0011] The cavity within the sealing ring is relatively difficult to form. Therefore, further improvements were made: the sealing ring has an L-shaped cross-section, replacing the cavity. The sealing ring consists of a radial portion and an axial portion connected in sequence; the radial portion rests against the piston, and the axial portion rests against the inner wall of the cylinder. The inner end of the oil inlet faces the axial portion and is away from the connection point between the two sides of the sealing ring. This arrangement only requires the axial portion to bend inward to achieve communication between the oil inlet and the rod cavity. This not only simplifies the sealing ring structure but also improves the stability of the connection between the oil inlet and the rod cavity.

[0012] Because the sealing ring is relatively soft and has little elasticity, its deformation is unstable. Based on this, a further improvement is to install an L-shaped spring piece inside the sealing ring. This piece is composed of a radial piece and an axial piece connected in sequence. The radial piece is located inside the radial portion, and the axial piece is located inside the axial portion. The spring piece increases the elasticity of the sealing ring, making its deformation and reset more stable.

[0013] When the radial portion deforms, it causes the axial portion to bend, causing the seal ring to shift. Based on this, a further improvement is to position the radial blade perpendicular to the cylinder axis. This arrangement ensures that the radial portion maintains its structural and positional stability. When oil is introduced into the oil inlet, only the axial portion deforms, allowing the seal ring to return to its original position without shifting.

[0014] The utility model also provides a gate hoist including a gate, wherein the gate driving structure is a hydraulic cylinder with a deformable piston seal ring, thereby reducing the cost of the gate hoist and achieving the purpose of energy saving and cost reduction.

[0015] The beneficial effects of the present invention are as follows: the setting of the cavity provides space for the sealing ring to deform, and when oil is fed into the oil inlet, the oil pressure can drive the sealing ring to compress, so that the sealing ring is away from the inner wall of the cylinder body, connecting the oil inlet and the rod chamber; when the hydraulic oil flows into the rod chamber from between the sealing ring and the inner wall of the cylinder body, the oil pressure in the rod chamber increases, driving the piston to move toward the bottom of the cylinder. The L-shaped cross-section of the sealing ring allows the oil pressure to drive the axial portion to bend inward when oil is fed into the oil inlet, so that the oil inlet and the rod chamber are connected, and the piston can be driven to move stably in the same manner. It can be seen that the present invention realizes the function of stably driving the piston to move while setting the oil inlet on the cylinder body, which not only simplifies the structure of the cylinder head and reduces the difficulty of producing the cylinder head, but also shortens the thickness of the cylinder head, saving materials and costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic structural diagram of the first embodiment of the present invention;

[0018] Figure 2 This is a schematic structural diagram of the second embodiment of the present utility model;

[0019] Figure 3 yes Figure 1 Enlarged view of point A in the middle;

[0020] Figure 4 yes Figure 2 Enlarged view of point B in the middle;

[0021] Figure 5 It is a schematic diagram of the structure of a traditional hydraulic cylinder;

[0022] In the figure: 1. Cylinder body; 2. Front cover; 3. Piston rod; 4. Oil inlet; 5. Piston; 6. Sealing ring; 7. Spring piece; 51. Card table; 61. Cavity; 62. Radial part; 63. Axial part; 71. Radial piece; 72. Axial piece. DETAILED DESCRIPTION

[0023] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0024] Example 1:

[0025] like Figure 1 and Figure 3 As shown, the utility model discloses a hydraulic cylinder with a deformable piston sealing ring, comprising a cylinder body 1, one end of which is provided with a front cover 2, a piston rod 3 passing through the front cover 2, and a rod cavity formed between the piston 5, the cylinder body 1 and the front cover 2.

[0026] An oil inlet 4 is provided on the cylinder body 1 near the front cover 2 , and the oil inlet 4 is perpendicular to the axial direction of the cylinder body 1 .

[0027] A recessed clamping platform 51 is provided at the outer ring position of the piston 5 at one end of the rod cavity, and a sealing ring 6 is clamped on the clamping platform 51 for sealing the piston 5 and the cylinder body 1.

[0028] A cavity 61 is provided within the sealing ring 6. When the piston rod 3 is fully extended, the oil inlet 4 faces the cavity 61. When oil enters the oil inlet 4, the sealing ring 6 is compressed by the action of the cavity 61, thereby connecting the oil inlet 4 with the rod cavity. When oil exits the oil inlet 4, the sealing ring 6 returns to its original position, thereby sealing the piston 5 with the cylinder body 1. The provision of the cavity 61 in this embodiment provides space for the sealing ring 6 to deform. When oil enters the oil inlet 4, the oil pressure can drive the sealing ring 6 to compress, causing the sealing ring 6 to move away from the inner wall of the cylinder body 1, thereby connecting the oil inlet 4 with the rod cavity. When hydraulic oil flows into the rod cavity from between the sealing ring 6 and the inner wall of the cylinder body 1, the oil pressure in the rod cavity increases, driving the piston 5 toward the bottom of the cylinder.

[0029] The cavity 61 is arranged near the rod cavity, and the axial length of the cavity 61 in the cylinder body 1 is less than two-thirds of the thickness of the sealing ring 6, so that when the oil inlet 4 is filled with oil, only the part of the sealing ring 6 near the rod cavity is deformed, so that the oil inlet 4 is connected with the rod cavity, and the remaining part still rests against the inner wall of the cylinder body 1 to maintain sealing and avoid communication between the rod cavity and the rodless cavity.

[0030] The difference from the prior art is that this embodiment realizes the function of setting the oil inlet 4 on the cylinder body 1 and stably driving the piston 5 to move through the structural design of the sealing ring 6. It not only simplifies the structure of the cylinder head and reduces the difficulty of producing the cylinder head, but also shortens the thickness of the cylinder head, saving materials and costs.

[0031] Example 2:

[0032] like Figure 2 and Figure 4 As shown, the utility model discloses a hydraulic cylinder with a deformable piston sealing ring, comprising a cylinder body 1, one end of which is provided with a front cover 2, a piston rod 3 passing through the front cover 2, and a rod cavity formed between the piston 5, the cylinder body 1 and the front cover 2.

[0033] An oil inlet 4 is provided on the cylinder body 1 near the front cover 2 , and the oil inlet 4 is perpendicular to the axial direction of the cylinder body 1 .

[0034] A recessed clamping platform 51 is provided at the outer ring position of the piston 5 at one end of the rod cavity, and a sealing ring 6 is clamped on the clamping platform 51 for sealing the piston 5 and the cylinder body 1.

[0035] The sealing ring 6 has an L-shaped cross-section, consisting of a radial portion 62 and an axial portion 63 connected in sequence. The radial portion 62 abuts the piston 5, while the axial portion 63 abuts the inner wall of the cylinder body 1. The inner end of the oil inlet 4 faces the axial portion 63 and is located away from the connection between the radial portion 62 and the axial portion 63. This arrangement only requires the axial portion 63 to bend inward to achieve communication between the oil inlet 4 and the rod chamber. This not only simplifies the structure of the sealing ring 6 but also improves the stability of the connection between the oil inlet 4 and the rod chamber.

[0036] Because the sealing ring 6 is relatively soft and has low elasticity, its deformation is unstable. Therefore, the following design is adopted: an L-shaped spring piece 7 is also provided inside the sealing ring 6. The spring piece 7 is composed of a radial piece 71 and an axial piece 72 connected in sequence. The radial piece 71 is located inside the radial portion 62, and the axial piece 72 is located inside the axial portion 63. The spring piece 7 increases the elasticity of the sealing ring 6, making its deformation and reset more stable.

[0037] The radial piece 71 is perpendicular to the axial direction of the cylinder body 1. In this way, the radial piece 71 keeps the radial portion 62 structurally and positionally stable. When oil enters the oil inlet 4, only the axial portion 63 deforms. In this way, the sealing ring 6 does not shift when it is deformed and reset, and the sealing performance of the sealing ring 6 is maintained.

[0038] The difference from the prior art is that this embodiment realizes the function of setting the oil inlet 4 on the cylinder body 1 and stably driving the piston 5 to move through the structural design of the sealing ring 6. It not only simplifies the structure of the cylinder head and reduces the difficulty of producing the cylinder head, but also shortens the thickness of the cylinder head, saving materials and costs.

[0039] Example 3:

[0040] The utility model also discloses a gate hoist, comprising a gate, wherein the gate driving structure is a hydraulic cylinder with a deformable piston seal ring according to any one of the first and second embodiments. This can reduce the cost of the gate hoist, thereby achieving the purpose of energy saving and cost reduction.

[0041] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A hydraulic cylinder with a deformable piston seal, comprising a cylinder body (1), one end of which is provided with a front cover (2), and a piston rod (3) passing through the front cover (2), characterized in that: The cylinder body (1) is provided with an oil inlet (4) at a position close to the front cover (2); A recessed clamping platform (51) is provided at the outer ring position of the piston (5) at one end of the rod cavity, and a sealing ring (6) is clamped on the clamping platform (51) for sealing the piston (5) and the cylinder body (1); A cavity (61) is provided in the sealing ring (6); When the piston rod (3) is fully extended, the oil inlet (4) faces the cavity (61); when oil is introduced into the oil inlet (4), the sealing ring (6) is compressed under the action of the cavity (61), so that the oil inlet (4) is connected to the rod cavity.

2. A hydraulic cylinder with a deformable piston seal ring according to claim 1, characterized in that: The cavity (61) is located near the rod cavity.

3. The hydraulic cylinder with a deformable piston seal ring according to claim 1, characterized in that: The cross section of the sealing ring (6) is L-shaped, and a cavity (61) is provided in place of the sealing ring (6); The sealing ring (6) is composed of a radial portion (62) and an axial portion (63) connected in sequence; The radial portion (62) abuts against the piston (5), and the axial portion (63) abuts against the inner wall of the cylinder (1); The inner end of the oil inlet (4) faces the axial portion (63) and is away from the position where the two sides of the sealing ring (6) are connected.

4. The hydraulic cylinder with a deformable piston seal ring according to claim 3, characterized in that: An L-shaped spring piece (7) is also provided in the sealing ring (6), which is composed of a radial piece (71) and an axial piece (72) connected in sequence; The radial sheet (71) is located inside the radial portion (62); The axial piece (72) is located inside the axial portion (63).

5. The hydraulic cylinder with a deformable piston seal ring according to claim 4, characterized in that: The radial sheet (71) is axially perpendicular to the cylinder body (1).

6. A gate hoist, comprising a gate, characterized in that: The gate driving structure adopts a hydraulic cylinder with a deformable piston sealing ring as described in any one of claims 1-5.

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