Sealing structure at joint of forklift hydraulic oil tank and lifting oil cylinder rod cavity

Abstract

The technical scheme of the utility model discloses a sealing structure at the joint of a forklift hydraulic oil tank and a lifting oil cylinder rod cavity, which comprises a lifting oil cylinder with a rod cavity; the hydraulic oil tank is provided with a fixed bracket and a breather valve; the air pipe joint penetrates through the fixed bracket, the sliding sleeve, the electromagnetic suction device and the forklift circuit main switch; when the forklift circuit main switch is in an on state, the electromagnetic attraction device is controlled to attract the sliding sleeve upwards to leave the liquid level of hydraulic oil; and when the forklift circuit main switch is in a closed state, the sliding sleeve is separated from the electromagnetic suction device and slides downwards until the sliding sleeve is immersed into the liquid level of the hydraulic oil. According to the sealing structure, under the working conditions that the medium of the rod cavity of the forklift lifting oil cylinder is air and an oil film cannot be generated on the surface of the inner hole of the cylinder barrel, rust on the surface of the inner hole of the cylinder barrel is reduced and the service life of the lifting oil cylinder is prolonged through a method of sealing and isolating outside air.

Description

Technical Field

[0001] This utility model relates to the field of forklift lifting cylinder technology, and in particular to a sealing structure at the connection between the hydraulic oil tank of a forklift and the rod chamber of the lifting cylinder. Background Technology

[0002] Forklift lifting cylinders are all single-acting cylinders. The rodless chamber contains hydraulic oil, while the rod chamber typically contains air. The rod chamber is connected to the forklift's hydraulic oil tank, which is open to the outside air. This means that when the cylinder is not in operation, no oil film forms on the inner surface of the cylinder bore, and moisture from the outside air can enter the rod chamber, causing rust on the inner surface of the cylinder bore. This significantly reduces the lifespan of the lifting cylinder. Utility Model Content

[0003] The technical problem solved by this utility model is that the existing connection structure between the rod chamber and the hydraulic oil tank of a forklift is prone to causing rust on the surface of the cylinder bore, which reduces the life of the lifting cylinder.

[0004] To solve the above-mentioned technical problems, the present invention provides a sealing structure at the connection between the hydraulic oil tank and the rod chamber of the lifting cylinder of a forklift, comprising:

[0005] The lifting cylinder has a rod chamber;

[0006] The hydraulic oil tank is equipped with a fixed bracket and a breather valve;

[0007] An air pipe connector passes through the fixed bracket, with one end connected to the rod chamber via an oil pipe and the other end located inside the hydraulic oil tank;

[0008] A sliding sleeve, movably fitted outside the air pipe connector and located inside the hydraulic oil tank; and

[0009] An electromagnetic engageer is connected to the air pipe connector and located outside the fixed bracket; the electromagnetic engageer is connected to the forklift's main electrical switch.

[0010] When the forklift's main circuit switch is in the open state, the electromagnetic attractor is controlled to pull the sliding sleeve upward away from the hydraulic oil surface;

[0011] When the forklift's main circuit switch is in the off state, the sliding sleeve disengages from the electromagnetic actuator and slides downwards until it is immersed in the hydraulic oil.

[0012] Optionally, the tracheal connector is a hollow structure with the upper and lower ends connected, and the lower end is bent outward to form an outer sliding stop.

[0013] Optionally, the outer diameter of the ventilator is larger than the inner diameter of the oil pipe.

[0014] Optionally, the fixing bracket has a through hole through which the endotracheal connector passes, and the outer diameter of the endotracheal connector is larger than the diameter of the through hole.

[0015] Optionally, the sliding sleeve is a hollow structure with the upper and lower ends connected, and the upper end is bent inward to form an inner sliding stop. The sliding sleeve is sleeved on the tracheal connector and can move back and forth up and down along the axial direction of the tracheal connector, and is limited by the outer sliding stop and the inner sliding stop.

[0016] Optionally, when the outer sliding block and the inner sliding block are in contact with each other, the sliding sleeve is immersed in the hydraulic oil surface.

[0017] Optionally, when the electromagnetic attractor attracts the sliding sleeve, the bottom of the sliding sleeve moves away and is positioned above the hydraulic oil level.

[0018] Optionally, the outer diameter of the outer sliding stop is less than or equal to the inner diameter of the sliding sleeve and greater than or equal to the inner diameter of the inner sliding stop.

[0019] Optionally, the hydraulic tank has a first mounting hole for mounting the fixed bracket and a second mounting hole for mounting the breather valve.

[0020] Optionally, the breather valve connects the outside to the inside of the hydraulic oil tank.

[0021] The beneficial effects of this utility model's technical solution are:

[0022] The sealing structure of this invention reduces rust on the inner surface of the cylinder and extends the service life of the lifting cylinder by sealing and isolating it from the outside air when the medium in the rod chamber of the forklift lifting cylinder is air and an oil film cannot be generated on the inner surface of the cylinder bore. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the sliding sleeve leaving the hydraulic oil surface in an embodiment of this utility model;

[0024] Figure 2 This is a schematic diagram of the structure of the sliding sleeve immersed in the hydraulic oil in an embodiment of this utility model.

[0025] In the attached diagram: 1. Hydraulic oil tank, 2. Electromagnetic actuator, 3. Fixed bracket, 4. Sliding sleeve, 5. Air pipe connector, 6. Breathing valve, 7. Forklift main circuit switch, 41. Inner sliding stop, 51. Outer sliding stop, 8. Air pipe, 9. Rod chamber. Detailed implementation method:

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] Please see Figure 1 and Figure 2The diagram illustrates a sealing structure at the connection between the hydraulic oil tank and the rod chamber of the lifting cylinder in one embodiment of a forklift. The structure includes a lifting cylinder with a rod chamber 9; a hydraulic oil tank 1 with a fixed bracket 3 and a breather valve 6; an air pipe connector 5 passing through the fixed bracket 3, with one end connected to the rod chamber 9 via an oil pipe 8, and the other end located inside the hydraulic oil tank 1; a sliding sleeve 4 movably fitted outside the air pipe connector 5 and located inside the hydraulic oil tank 1; and an electromagnetic actuator 2 connected to the air pipe connector 5 and located outside the fixed bracket 3. The electromagnetic actuator 2 is connected to the forklift's main circuit switch 7. When the forklift's main circuit switch 7 is in the open state, the electromagnetic actuator 2 controls the sliding sleeve 4 to be drawn upwards away from the hydraulic oil surface; when the forklift's main circuit switch 7 is in the closed state, the sliding sleeve 4 disengages from the electromagnetic actuator 2 and slides downwards until it is immersed in the hydraulic oil surface.

[0032] In this embodiment, the tracheal connector 5 is a hollow structure with the upper and lower ends connected, and the lower end is bent outward to form an outer sliding block 51.

[0033] In this embodiment, the outer diameter of the air pipe connector 5 is larger than the inner diameter of the oil pipe 8.

[0034] In this embodiment, the fixed bracket 3 has a through hole through which the air pipe connector 5 passes, and the outer diameter of the air pipe connector 5 is larger than the diameter of the through hole.

[0035] In this embodiment, the sliding sleeve 4 is a hollow structure with the upper and lower ends connected, and the upper end is bent inward to form an inner sliding block 41. The sliding sleeve 4 is sleeved on the air pipe connector 5 and can move back and forth up and down along the axial direction of the air pipe connector 5. It is limited by the outer sliding block 51 and the inner sliding block 41.

[0036] In this embodiment, when the outer sliding block 51 and the inner sliding block 41 come into contact with each other, the sliding sleeve 4 is immersed in the hydraulic oil surface.

[0037] In this embodiment, when the electromagnetic attractor 2 attracts the sliding sleeve 4, the bottom of the sliding sleeve 4 leaves and is located above the hydraulic oil surface.

[0038] In this embodiment, the outer diameter of the outer sliding block 51 is less than or equal to the inner diameter of the sliding sleeve 4 and greater than or equal to the inner diameter of the inner sliding block 41.

[0039] In this embodiment, the hydraulic oil tank 1 has a first mounting hole for mounting the fixed bracket 3 and a second mounting hole for mounting the breather valve 6.

[0040] In this embodiment, the breather valve 6 connects the outside to the inside of the hydraulic oil tank 1.

[0041] The following description will further illustrate the characteristics and functions of this utility model.

[0042] Figure 1This is a schematic diagram illustrating the application of the sealing structure at the connection between the forklift hydraulic oil tank and the rod chamber of the lifting cylinder in the closed state when the forklift is not in operation:

[0043] The hydraulic oil tank 1 is equipped with a fixed bracket 3 and a breather valve 6 on its upper plate.

[0044] An electromagnetic actuator 2 is installed above the fixed bracket 3, and the electromagnetic actuator 2 is linked to the forklift's main circuit switch 7.

[0045] The inner hole of the fixed bracket 3 is provided with an air pipe connector 5, and the upper part of the air pipe connector 5 is connected to the rod chamber of the forklift lifting cylinder through an air pipe. The lower part of the air pipe connector 5 is provided with an outer sliding stop 51.

[0046] The sliding sleeve 4 is fitted onto the tracheal connector 5 and can slide up and down along the axis of the tracheal connector 5. An inner sliding stop 41 is provided above the sliding sleeve 4.

[0047] The breather valve 6 allows the hydraulic oil tank 1 to communicate with the outside air, and reduces the amount of moisture and dust in the air entering the hydraulic oil tank 1.

[0048] The working principle of the sealing structure in this embodiment is as follows:

[0049] When the forklift's main circuit switch 7 is in the off state, the electromagnetic actuator 2 is also in the off state. At this time, the sliding sleeve 4 slides downward under the action of gravity until the inner sliding block 41 contacts the outer sliding block 51 below the air pipe connector 5. At this time, the lower part of the sliding sleeve 4 is immersed below the low level line of the hydraulic oil in the hydraulic oil tank 1, thus achieving a seal at the connection between the forklift's hydraulic oil tank and the rod chamber of the lifting cylinder.

[0050] refer to Figure 2 When the forklift's main circuit switch 7 is in the open state, the electromagnetic actuator 2 is also in the open state. At this time, the sliding sleeve 4 slides upward under the magnetic force of the electromagnetic actuator 2 until it contacts the fixed bracket 3. At this time, the lower part of the sliding sleeve 4 is exposed above the high level line of the hydraulic oil in the hydraulic oil tank 1. When the forklift lifting cylinder is working, it will not suck the hydraulic oil into the rod chamber.

[0051] In summary, the sealing structure of this utility model reduces rust on the inner surface of the cylinder and extends the service life of the lifting cylinder by sealing and isolating it from the outside air when the medium in the rod chamber of the forklift lifting cylinder is air and an oil film cannot be generated on the inner surface of the cylinder bore.

[0052] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sealing structure at the connection between the hydraulic oil tank and the rod chamber of the lifting cylinder of a forklift, characterized in that, include: The lifting cylinder has a rod chamber; The hydraulic oil tank is equipped with a fixed bracket and a breather valve; An air pipe connector passes through the fixed bracket, with one end connected to the rod chamber via an oil pipe and the other end located inside the hydraulic oil tank; A sliding sleeve is movably fitted outside the air pipe connector and located inside the hydraulic oil tank; as well as An electromagnetic actuator is connected to the air pipe connector and located outside the fixed bracket; the electromagnetic actuator is connected to the forklift's main circuit switch. in When the forklift's main circuit switch is in the open state, the electromagnetic attractor is controlled to pull the sliding sleeve upward away from the hydraulic oil surface; When the forklift's main circuit switch is in the off state, the sliding sleeve disengages from the electromagnetic actuator and slides downwards until it is immersed in the hydraulic oil.

2. The sealing structure at the connection between the forklift hydraulic oil tank and the rod chamber of the lifting cylinder according to claim 1, characterized in that, The endotracheal connector is a hollow structure with the upper and lower ends connected, and the lower end is bent outward to form an outer sliding stop.

3. The sealing structure at the connection between the forklift hydraulic oil tank and the rod chamber of the lifting cylinder according to claim 2, characterized in that, The outer diameter of the vent pipe connector is larger than the inner diameter of the oil pipe.

4. The sealing structure at the connection between the forklift hydraulic oil tank and the rod chamber of the lifting cylinder according to claim 3, characterized in that, The fixing bracket has a through hole through which the tracheal connector passes, and the outer diameter of the tracheal connector is larger than the diameter of the through hole.

5. The sealing structure at the connection between the forklift hydraulic oil tank and the rod chamber of the lifting cylinder according to claim 4, characterized in that, The sliding sleeve is a hollow structure with the upper and lower ends connected, and the upper end is bent inward to form an inner sliding block. The sliding sleeve is sleeved on the tracheal connector and can move up and down back and forth along the axial direction of the tracheal connector. It is limited by the outer sliding block and the inner sliding block.

6. The sealing structure at the connection between the forklift hydraulic oil tank and the rod chamber of the lifting cylinder according to claim 5, characterized in that, When the outer sliding block and the inner sliding block come into contact with each other, the sliding sleeve is immersed in the hydraulic oil surface.

7. The sealing structure at the connection between the forklift hydraulic oil tank and the rod chamber of the lifting cylinder according to claim 6, characterized in that, When the electromagnetic attractor attracts the sliding sleeve, the bottom of the sliding sleeve moves away and is positioned above the hydraulic oil level.

8. The sealing structure at the connection between the forklift hydraulic oil tank and the rod chamber of the lifting cylinder according to claim 7, characterized in that, The outer diameter of the outer sliding stop is less than or equal to the inner diameter of the sliding sleeve and greater than or equal to the inner diameter of the inner sliding stop.

9. The sealing structure at the connection between the forklift hydraulic oil tank and the rod chamber of the lifting cylinder according to claim 8, characterized in that, The hydraulic oil tank has a first mounting hole for mounting the fixed bracket and a second mounting hole for mounting the breather valve.

10. The sealing structure at the connection between the forklift hydraulic oil tank and the rod chamber of the lifting cylinder according to claim 9, characterized in that, The breather valve connects the outside to the inside of the hydraulic oil tank.

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