Sealing hydraulic cylinder

Abstract

The utility model discloses a sealing hydraulic cylinder which comprises a cylinder body, the bottom end of the cylinder body is fixedly connected with a base, the outer wall of the cylinder body is sleeved with a protective sleeve, the top end of the cylinder body is fixedly connected with an end cover, the end cover is provided with a limiting hole, the inner wall of the limiting hole is provided with a gasket, and the inner wall of the gasket is provided with a dustproof mechanism. A piston rod is arranged on the inner wall of the dustproof mechanism in a penetrating mode. The sealing gasket and the sealing sleeve are sleeved on the outer wall of the piston rod through the through hole, when the piston rod is contracted, the sealing gasket is driven to move downwards, the sealing sleeve is clamped with the limiting hole, the penetrating position of the piston rod and the cylinder body is sealed, air is exhausted through the air hole when the sealing sleeve and the sealing gasket are extruded, and expansion is avoided. When the cylinder body is used and the piston rod is stored in the cylinder body, the sealing sleeve and the sealing gasket can be pressed into the limiting hole for sealing through the limiting ring, oil in the cylinder body is prevented from being volatilized as much as possible when air enters, the sealing performance is high, and therefore the optimal sealing effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a sealed hydraulic cylinder. Background Art

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy, producing linear reciprocating (or oscillating) motion. It features a simple structure and reliable operation. Using it to achieve reciprocating motion eliminates the need for a reduction gear, eliminates transmission backlash, and provides smooth motion. Therefore, it is widely used in the hydraulic systems of various machines.

[0003] Existing hydraulic cylinders are prone to dust adhesion during the extension and retraction of the piston rod, which brings the dust adhered to the surface into the cylinder body. When the piston rod is retracted inside the cylinder body, a gap is easily left at the penetration point between the piston rod and the cylinder body. When air enters, it is easy to accelerate the volatilization of the oil in the cylinder body, resulting in poor sealing performance and failure to achieve the best sealing effect. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a sealed hydraulic cylinder.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A sealed hydraulic cylinder comprises a cylinder body, the bottom end of the cylinder body is fixedly connected to a base, the outer wall of the cylinder body is provided with a protective sleeve, the top end of the cylinder body is fixedly connected to an end cover, a limiting hole is provided on the end cover, a gasket is provided on the inner wall of the limiting hole, a dustproof mechanism is provided on the inner wall of the gasket, a piston rod is passed through the inner wall of the dustproof mechanism, a sealing mechanism is provided on the outer wall of the piston rod, a limiting ring fixedly connected to the outer periphery of the piston rod is provided above the sealing mechanism, the top end of the piston rod is fixedly connected to a mounting seat, and a mounting hole is provided on the mounting seat.

[0007] Preferably, the protective sleeve is arranged around the outer wall of the cylinder body, and the protective sleeve is made of stainless steel.

[0008] Preferably, the dustproof mechanism comprises a guide sleeve, the inner wall of the guide sleeve is provided with a gasket, a groove is provided on the gasket, and a dustproof ring is provided around the bottom of the gasket.

[0009] Preferably, the dust ring is sleeved on the outer wall of the piston rod, and the top surface of the dust ring is fixedly connected to the bottom surface of the guide sleeve.

[0010] Preferably, the sealing mechanism includes a sealing gasket, a sealing sleeve is provided on the outer periphery of the sealing gasket, an air vent is provided on the inner wall of the sealing gasket, a buffer ring is provided in the middle of the inner wall of the sealing gasket, and a through hole is provided at the center of the buffer ring.

[0011] Preferably, the buffer ring is sleeved on the outer wall of the piston rod through a through hole.

[0012] Preferably, the sealing sleeve is engaged with the limiting hole.

[0013] The utility model has the following beneficial effects:

[0014] 1. Compared with the existing technology, the sealed hydraulic cylinder can support the outer periphery of the piston rod through the guide sleeve when the piston rod is under great pressure, and use the dust ring to scrape off the dust on the surface of the piston rod during its movement. After a long time of use, the scraped dust will accumulate on the upper surface of the dust ring, and then be squeezed out through the groove, and then cleaned with a brush, so as to try to avoid the piston rod from bringing the adhered dust into the cylinder body during the movement, which is highly practical.

[0015] 2. Compared with the existing technology, the sealed hydraulic cylinder uses a through-hole to cover the sealing gasket and the sealing sleeve on the outer wall of the piston rod. When the piston rod contracts, the sealing gasket is driven to move downward, so that the sealing sleeve is engaged with the limiting hole, thereby sealing the penetration point between the piston rod and the cylinder body. The air vent is used to allow air to pass through the sealing sleeve when it is squeezed to avoid expansion. When the cylinder body is used up and the piston rod is put into the cylinder body, the sealing sleeve and the sealing gasket can be pressed into the limiting hole through the limiting ring for sealing, thereby avoiding the entry of air to cause the oil in the cylinder body to volatilize. The sealing is strong, thereby achieving the best sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a sealed hydraulic cylinder proposed by the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the dust-proof mechanism proposed in the utility model;

[0018] Figure 3 This is a structural diagram of the sealing mechanism proposed in the present utility model.

[0019] Legend:

[0020] 1. Cylinder body; 2. Base; 3. Protective sleeve; 4. End cover; 5. Limiting hole; 6. Gasket; 7. Dustproof mechanism; 71. Guide sleeve; 72. Gasket; 73. Groove; 74. Dustproof ring; 8. Piston rod; 9. Sealing mechanism; 91. Sealing gasket; 92. Sealing sleeve; 93. Vent hole; 94. Buffer ring; 95. Through hole; 10. Limiting ring; 11. Mounting seat; 12. Mounting hole. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Reference Figure 1-3 The utility model provides a sealed hydraulic cylinder: it includes a cylinder body 1, the bottom end of the cylinder body 1 is fixedly connected to a base 2, the outer wall of the cylinder body 1 is sleeved with a protective sleeve 3, the protective sleeve 3 is made of stainless steel, and the outer wall of the cylinder body 1 can be protected by the protective sleeve 3 to avoid scratches and bumps during use, thereby extending the service life. The top of the cylinder body 1 is fixedly connected to an end cover 4, the end cover 4 is provided with a limiting hole 5, the inner wall of the limiting hole 5 is provided with a gasket 6, the inner wall of the gasket 6 is provided with a dustproof mechanism 7, the inner wall of the dustproof mechanism 7 is penetrated by a piston rod 8, the outer wall of the piston rod 8 is provided with a sealing mechanism 9, and a limiting ring 10 fixedly connected to the outer periphery of the piston rod is provided above the sealing mechanism. The top of the piston rod 8 is fixedly connected to a mounting seat 11, and the mounting seat 11 is provided with a mounting hole 12.

[0023] The dustproof mechanism 7 includes a guide sleeve 71, the inner wall of the guide sleeve 71 is provided with a gasket 72, the inner wall of the gasket 72 is provided with a strip groove 73 along the circumferential direction, and a dustproof ring 74 is provided around the bottom of the gasket. The guide sleeve 71 can support the outside of the piston rod 8 when the pressure is large, and the dustproof ring 74 is used to scrape off the dust on the surface of the piston rod 8 during its movement. After a long time of use, the scraped dust will accumulate on the upper surface of the dustproof ring 74, and then be squeezed out through the strip groove 73, and then cleaned with a brush to avoid the dust adhered to the piston rod 8 during the extension and retraction process from being brought into the cylinder body 1 as much as possible. The dustproof ring 74 is sleeved on the outer wall of the piston rod 8, and the top surface of the dustproof ring 74 is fixedly connected to the bottom surface of the guide sleeve 71.

[0024] The sealing mechanism 9 includes a sealing gasket 91, a sealing sleeve 92 is sleeved around the outer wall of the sealing gasket 91, and the inner wall of the sealing gasket 91 is provided with evenly distributed air holes 93. A buffer ring 94 is provided in the middle of the inner wall of the sealing gasket 91, and a through hole 95 is opened in the center of the buffer ring 94. The buffer ring 94 is sleeved on the outer wall of the piston rod through the through hole, and then the sealing gasket 91 and the sealing sleeve 92 are sleeved on the outer wall of the piston rod 8 through the buffer ring 94. When the piston rod 8 contracts, the sealing gasket 91 is driven to move downward, so that the sealing sleeve 92 is engaged with the limiting hole 5, so that the penetration of the piston rod 8 and the cylinder body 1 is sealed. The air is exhausted through the air hole 93 when the sealing sleeve 92 and the sealing gasket 91 are squeezed to avoid expansion. When the cylinder body 1 is used up and the piston rod 8 is put into the cylinder body 1, the sealing sleeve 92 and the sealing gasket 91 can be pressed into the limiting hole 5 through the limiting ring 10 for sealing, so as to try to avoid air from entering and causing the oil in the cylinder body 1 to evaporate.

[0025] Working principle: The outer wall of the cylinder body 1 can be protected by the protective sleeve 3 to avoid scratches and bumps during use and extend the service life. The outer periphery of the piston rod 8 can be supported by the guide sleeve 71 when the pressure is large. The dust ring 74 can be used to scrape off the dust on the surface of the piston rod 8 during its contraction. After a long time of use, the scraped dust will accumulate on the upper surface of the dust ring 74, and then squeeze out the accumulated dust through the groove 73. Then use a brush to clean it, and try to avoid the piston rod 8 from bringing the adhered dust into the cylinder body 1 during the movement. 95. The sealing gasket 91 and the sealing sleeve 92 are sleeved on the outer wall of the piston rod 8. When the piston rod 8 contracts, the sealing gasket 91 is driven to move downward, so that the sealing sleeve 92 is engaged with the limiting hole 5, and the penetration point between the piston rod 8 and the cylinder body 1 is sealed. The air is exhausted through the air vent 93 when the sealing sleeve 92 and the sealing gasket 91 are squeezed to avoid expansion. When the cylinder body 1 is used up and the piston rod 8 is put into the cylinder body 1, the sealing sleeve 92 and the sealing gasket 91 can be pressed into the limiting hole 5 through the limiting ring 10 for sealing, so as to avoid air from entering and causing the oil in the cylinder body 1 to evaporate.

[0026] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sealed hydraulic cylinder, comprising a cylinder body (1), characterized in that: The bottom end of the cylinder body (1) is fixedly connected to a base (2), the outer wall of the cylinder body (1) is provided with a protective sleeve (3), the top end of the cylinder body (1) is fixedly connected to an end cover (4), the end cover (4) is provided with a limiting hole (5), the inner wall of the limiting hole (5) is provided with a gasket (6), the inner wall of the gasket (6) is provided with a dustproof mechanism (7), the inner wall of the dustproof mechanism (7) is penetrated by a piston rod (8), the outer wall of the piston rod (8) is provided with a sealing mechanism (9), a limiting ring (10) fixedly connected to the outer periphery of the piston rod is provided above the sealing mechanism (9), the top end of the piston rod (8) is fixedly connected to a mounting seat (11), and the mounting seat (11) is provided with a mounting hole (12).

2. A sealed hydraulic cylinder according to claim 1, characterized in that: The protective sleeve (3) is sheathed around the outer wall of the cylinder body (1), and the protective sleeve (3) is made of stainless steel.

3. The sealed hydraulic cylinder according to claim 1, characterized in that: The dustproof mechanism (7) comprises a guide sleeve (71), the inner wall of the guide sleeve (71) is provided with a gasket (72), a groove (73) is provided on the gasket (72), and a dustproof ring (74) is provided around the bottom of the gasket (72).

4. A sealed hydraulic cylinder according to claim 3, characterized in that: The dustproof ring (74) is sleeved on the outer wall of the piston rod (8), and the top surface of the dustproof ring (74) is fixedly connected to the bottom surface of the guide sleeve (71).

5. The sealed hydraulic cylinder according to claim 1, characterized in that: The sealing mechanism (9) comprises a sealing gasket (91), a sealing sleeve (92) is provided on the outer periphery of the sealing gasket (91), an air vent (93) is provided on the inner wall of the sealing gasket (91), a buffer ring (94) is provided in the middle of the inner wall of the sealing gasket (91), and a through hole (95) is provided at the center of the buffer ring (94).

6. A sealed hydraulic cylinder according to claim 5, characterized in that: The buffer ring (94) is sleeved on the outer wall of the piston rod (8) through the through hole (95).

7. The sealed hydraulic cylinder according to claim 5, characterized in that: The sealing sleeve (92) is engaged with the limiting hole (5).

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