Oil cylinder with standby oil seal

Abstract

The oil cylinder comprises an oil seal assembly, a cylinder barrel, a plunger rod and an extrusion assembly capable of moving between an initial position and an extrusion position, the initial position is located over the extrusion position, the cylinder barrel is provided with an oil cavity and an end opening, the end opening is communicated with the oil cavity, the plunger rod penetrates through the end opening of the cylinder barrel, and the extrusion assembly can move between the initial position and the extrusion position. The oil seal assembly comprises a first oil seal and a second oil seal, the first oil seal and the second oil seal are both arranged on the inner wall of the port, the first oil seal makes contact with the plunger rod, the extrusion assembly is arranged on the peripheral side of the port, and at least one part of the extrusion assembly directly faces the second oil seal up and down; when the extrusion assembly is located at the initial position, the second oil seal is in a contracted state, a gap exists between the second oil seal and the plunger rod, when the extrusion assembly is located at the extrusion position, the second oil seal is in an unfolded state and makes contact with the plunger rod, the first oil seal can be replaced without disassembling the cylinder barrel when losing efficacy, and the first oil seal is replaced after work is completed. And the working efficiency is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of oil cylinder especially relates to an oil cylinder with spare oil seal. BACKGROUND

[0002] The oil seal is a mechanical element for plugging oil, and the port of the plunger type oil cylinder is often provided with an oil seal matched with the plunger rod to prevent oil leakage during movement of the plunger rod. When the oil seal reaches the service life, the work of the oil cylinder needs to be stopped to replace the oil seal.

[0003] However, the current equipment stopper consumes a large cost, specifically, if the oil seal is replaced by stopping the work of the oil cylinder, the working efficiency of the equipment will be affected, and the equipment also needs to consume a large amount of energy to restart, which finally causes the cost of replacing the oil seal to be too high. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing an oil cylinder with spare oil seal to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] An oil cylinder with spare oil seal is provided, which comprises an oil inlet and outlet, an oil seal assembly, a cylinder barrel, a plunger rod and a pressing assembly movable between an initial position and a pressing position, the initial position is directly above the pressing position, the cylinder barrel is provided with an oil cavity and a port, the oil inlet and outlet are communicated with the oil cavity, the upper end of the port is communicated with the oil cavity, the plunger rod passes through the port of the cylinder barrel, the oil seal assembly comprises a first oil seal and a second oil seal, both the first oil seal and the second oil seal are arranged on the inner wall of the port, the first oil seal is in contact with the plunger rod, the pressing assembly is arranged on the circumferential side of the port and at least a part thereof is vertically opposite to the second oil seal, when the pressing assembly is located at the initial position, the second oil seal is in a contracted state and there is a gap between the second oil seal and the plunger rod, when the pressing assembly is located at the pressing position, the second oil seal is in an expanded state and is in contact with the plunger rod.

[0007] Further, the inner side surface of the first oil seal is inclined inward from top to bottom, and a slope angle is arranged at the position closest to the plunger rod, and a deformation groove is arranged at the lower end of the slope angle for bending inward.

[0008] Further, the second oil seal is a cloth-pressed oil seal.

[0009] Further, the pressing assembly comprises a bolt and an end cover, the end cover is arranged on the upper end of the second oil seal, and the bolt is connected with the cylinder barrel through the end cover.

[0010] Further, the second oil seal is provided above the first oil seal, and the second oil seal is retracted in the inner wall of the cylinder barrel when the first oil seal is normal.

[0011] Further, the second oil seal is provided above the first oil seal, and the second oil seal is retracted in the inner wall of the cylinder barrel when the first oil seal is normal.

[0012] Further, the inlet and outlet oil port is located at the lower end of the side wall of the cylinder barrel.

[0013] Compared with the prior art, the oil cylinder with the standby oil seal has the beneficial effects that:

[0014] The utility model provides a kind of oil cylinder with spare oil seal, second oil seal is equipped in the upper of first oil seal, when first oil seal is normal, second oil seal is retracted in the inner wall of cylinder barrel, when first oil seal cannot realize sealing, second oil seal can be pressed down by extruding component, so that second oil seal is contacted with the outer wall of plunger rod, realizes sealing effect, the operation steps are relatively simple, the advantage is that first oil seal does not need to be replaced by disassembling cylinder barrel when first oil seal fails, can be replaced after work is completed, greatly increase work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the second oil seal contraction state sectional view of the utility model oil cylinder;

[0016] Figure 2 It is Figure 1 enlarged view of P1;

[0017] Figure 3 It is the second oil seal expansion state sectional view of the utility model oil cylinder;

[0018] Figure 4 It is Figure 3 enlarged view of P2;

[0019] Figure 5 It is the first oil seal sectional view of the utility model;

[0020] The marks of components in the drawings are as follows: 1, inlet and outlet oil port;2, cylinder barrel;3, plunger rod;4, first oil seal;41, inclined angle;42, deformation groove;5, second oil seal;6, bolt;7, end cover;8, lower pressing block;9, pressure receiving block. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be described clearly and completely in conjunction with the drawings in the embodiments of the utility model.

[0022] Please refer to Figures 1 to 5The utility model provides a cylinder with spare oil seal, and the following provides an embodiment: including inlet and outlet oil port 1, oil seal assembly, cylinder 2, plunger rod 3 and the extrusion assembly that can move between an initial position and an extrusion position, the initial position is located just above the extrusion position, and cylinder 2 is provided with oil cavity and port, inlet and outlet oil port 1 communicate with oil cavity, and the upper end of port communicates with oil cavity, plunger rod 3 passes through the port of cylinder 2, and the oil seal assembly includes first oil seal 4 and second oil seal 5, first oil seal 4 and second oil seal 5 are all arranged on the inner wall of port, first oil seal 4 is in contact with plunger rod 3, and the extrusion assembly is arranged on the circumferential side of port and at least a part is vertically opposite to second oil seal 5, when the extrusion assembly is located in the initial position, second oil seal 5 is in the state of contraction and there is a gap between second oil seal 5 and plunger rod 3, and when the extrusion assembly is located in the extrusion position, second oil seal 5 is in the state of expansion and is in contact with plunger rod 3.In use, the extrusion assembly is located in the initial position, and the opposite second oil seal 5 is in the state of contraction, and there is a gap between second oil seal 5 and plunger rod 3, and only first oil seal 4 prevents oil leakage, and plunger rod 3 moves up and down in port and oil cavity, and oil is extruded from inlet and outlet oil port 1 by plunger rod 3 to oil cavity, because the inner side of first oil seal 4 is in contact with the outer wall of plunger rod 3, after a period of use, first oil seal 4 is deformed and loses the sealing effect, at this time, the extrusion assembly is moved to the extrusion position, and second oil seal 5 is extruded and is in the state of expansion and is in contact with plunger rod 3, and oil cannot overflow from port, and the advantage is that first oil seal 4 does not need to be replaced by disassembling cylinder 2 when first oil seal 4 is invalid, and first oil seal 4 can be replaced after work is completed, so that work efficiency is greatly improved.

[0023] Specifically, the inner side of the first oil seal 4 is inclined inward from top to bottom, and a slope angle 41 is arranged at the position closest to the plunger rod 3, and a deformation groove 42 is arranged at the lower end of the first oil seal 4 for the inward bending of the slope angle 41. Because the plunger rod 3 moves up and down in the port, when the plunger rod 3 is inserted downward, the slope angle 41 can bend inward, which meets the required insertion space of the plunger rod 3, and at the same time, the slope angle 41 can tightly fit the outer wall of the plunger rod 3 to prevent oil leakage.

[0024] Specifically, the second oil seal 5 is a fabric-pressed oil seal. The fabric-pressed oil seal has higher toughness and wear resistance and lower rigidity than the skeleton oil seal, so that the service life of the second oil seal 5 can be improved.

[0025] More specifically, the extrusion assembly includes a bolt 6 and an end cover 7, the end cover 7 is arranged on the upper end of the second oil seal 5, the bolt 6 passes through the end cover 7 and is connected with the cylinder 2, and the bolt 6 is threadedly connected with the upper end of the cylinder 2. The end cover 7 is moved up and down by rotating the bolt 6, when the end cover 7 moves downward to press the second oil seal 5, the second oil seal 5 is in the state of expansion, and when the end cover 7 moves upward, the second oil seal 5 restores and is in the state of contraction.

[0026] More specifically, the second oil seal 5 is provided with a lower pressing block 8, the lower surface of the lower pressing block 8 is provided with a groove corresponding to the upper surface of the cloth sandwiching oil seal, the lower surface of the second oil seal 5 is provided with a pressure bearing block 9, and the upper surface of the pressure bearing block 9 is provided with a convex part corresponding to the lower surface of the cloth sandwiching oil seal. The lower pressing block 8 and the pressure bearing block 9 can better correspond to the extrusion effect when the end cover 7 is pressed.

[0027] Specifically, the second oil seal 5 is a plurality of second oil seals 5 arranged in layers. The plurality of cloth sandwiching oil seals are extruded and expanded in sequence, and the stacking of the plurality of cloth sandwiching oil seals can improve the sealing effect.

[0028] Specifically, the inlet and outlet oil port 1 is located at the lower end of the side wall of the cylinder barrel 2. When the oil cylinder is operated, the oil can enter and exit through the side wall of the cylinder barrel 2 from the inlet and outlet oil port 1.

[0029] The above is only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacements or changes according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A cylinder with a backup oil seal, characterized in that: The utility model provides an oil seal assembly and extrusion assembly of a hydraulic cylinder, comprising an inlet and outlet oil port (1), an oil seal assembly, a cylinder barrel (2), a plunger rod (3) and an extrusion assembly movable between an initial position and an extrusion position, the initial position being directly above the extrusion position, the cylinder barrel (2) being provided with an oil cavity and a port, the inlet and outlet oil port (1) being in communication with the oil cavity, the port being in communication with the upper end of the oil cavity, the plunger rod (3) passing through the port of the cylinder barrel (2), the oil seal assembly comprising a first oil seal (4) and a second oil seal (5), the first oil seal (4) and the second oil seal (5) both being arranged on the inner wall of the port, the first oil seal (4) being in contact with the plunger rod (3), the extrusion assembly being arranged on the circumferential side of the port and at least partially vertically opposite the second oil seal (5), the second oil seal (5) being in a contracted state and having a gap with the plunger rod (3) when the extrusion assembly is in the initial position, and the second oil seal (5) being in an expanded state and in contact with the plunger rod (3) when the extrusion assembly is in the extrusion position.

2. The oil cylinder with a backup oil seal according to claim 1, characterized in that: The inner side surface of the first oil seal (4) is inclined inward from top to bottom, and a slope change angle (41) is arranged at the position closest to the plunger rod (3), and a deformation groove (42) for inward bending of the slope change angle (41) is arranged at the lower end of the slope change angle (41).

3. The oil cylinder with a backup oil seal according to claim 1, characterized in that: The second oil seal (5) is a cloth-pressed oil seal.

4. The oil cylinder with a backup oil seal according to claim 3, characterized in that: The extrusion assembly comprises a bolt (6) and an end cover (7), the end cover (7) being pressed on the upper end of the second oil seal (5), and the bolt (6) passing through the end cover (7) and being connected with the cylinder barrel (2).

5. The oil cylinder with a backup oil seal according to claim 3, characterized in that: A pressing block (8) is arranged above the cloth-pressed oil seal, the lower surface of the pressing block (8) being provided with a groove corresponding to the upper surface of the cloth-pressed oil seal, a pressure bearing block (9) is arranged below the cloth-pressed oil seal, and the upper surface of the pressure bearing block (9) is provided with a convex part corresponding to the lower surface of the cloth-pressed oil seal.

6. The oil cylinder with a backup oil seal according to claim 3, characterized in that: The second oil seal (5) is a plurality of second oil seals (5) arranged in layers from top to bottom.

7. The oil cylinder with a backup oil seal of claim 1, wherein: The inlet and outlet oil port (1) is located at the lower end of the side wall of the cylinder barrel (2).

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