Device for cleaning impurities in portal oil cylinder, hydraulic system and forklift

Abstract

The utility model discloses a device for cleaning impurities in a portal oil cylinder, a hydraulic system and a forklift. The device comprises a first connecting block, a first one-way valve, a first connecting pipeline, a filtering device assembly, a second connecting block, a second connecting pipeline, a second one-way valve and a third connecting pipeline. A port A of the device is connected to a multi-way valve, and a port B of the device is connected to an oil inlet of a portal oil cylinder. When the portal oil cylinder is in an extending state, oil enters the oil cylinder through the second one-way valve; when the portal oil cylinder retracts, the oil passes through the first one-way valve, passes through the filtering device assembly, is filtered and then flows to other elements. The filter device assembly is provided with a pressure difference signal transmitter and a bypass valve, when the pressure difference of an oil inlet and an oil outlet is too large due to blockage or other reasons, the pressure difference signal transmitter can transmit a signal to remind an operator to replace a filter element, and meanwhile, the bypass valve can automatically start a protection system to prevent loss caused by reverse flow of oil.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems, in particular to a device for cleaning impurities in a gantry oil cylinder. Background Art

[0002] In the field of forklifts, most of the hydraulic system filtration devices are currently based on return oil filters. For industrial vehicles such as forklifts, which have frequently used masts, impurities will be produced in the oil cylinder due to wear during long-term operation of the mast. To filter these impurities, they must pass through a series of other components and finally be filtered through the return oil filter configured in the hydraulic system. In this way, impurities are likely to affect the use and life of other components, and will also affect the technicians' troubleshooting. Summary of the invention

[0003] In view of the deficiencies in the prior art, the utility model provides a device for cleaning impurities in a gantry oil cylinder, which can filter the hydraulic oil passing through the gantry oil cylinder to prevent the impurities generated by the gantry oil cylinder after working for a long time from entering other components and damaging the other components.

[0004] The utility model is implemented according to the following technical solutions:

[0005] In the first aspect, the utility model provides a device for cleaning impurities in a gantry oil cylinder, comprising a first connecting block, a first one-way valve, a first connecting pipeline, a filter device assembly, a second connecting block, a second connecting pipeline, a second one-way valve, and a third connecting pipeline; the first connecting block is installed on the second one-way valve, and the second connecting block is installed on the first one-way valve; the first connecting block is connected to the filter device assembly through the first connecting pipeline, the filter device assembly is connected to the first one-way valve through the second connecting pipeline, and the second connecting block is connected to the second one-way valve through the third connecting pipeline; the second connecting block is provided with an A port connected to the multi-way valve, and the first connecting block is provided with a B port connected to the oil inlet of the gantry oil cylinder; when the gantry oil cylinder is in an extended state, the oil enters the gantry oil cylinder through the second one-way valve; when the gantry oil cylinder is retracted, the oil enters the multi-way valve through the filter device assembly and the first one-way valve.

[0006] In some embodiments, the filter device assembly is composed of a filter, a pressure difference transmitter and a bypass valve.

[0007] In some embodiments, when the oil circuit is blocked and the pressure difference between the inlet and outlet reaches 0.55MPa, the pressure difference detector starts sending a signal to remind the operator; when the pressure difference between the inlet and outlet reaches 0.6MPa, the bypass valve opens.

[0008] In some embodiments, the first connecting block, the first one-way valve, the first connecting pipeline, the filter device assembly, the second connecting block, the second connecting pipeline, the second one-way valve, and the third connecting pipeline are all connected in a detachable manner.

[0009] In some embodiments, the first connecting block is a three-way valve, wherein one threaded port is port B, another port is threadedly connected to the second one-way valve, and the last port is threadedly connected to the first connecting pipeline.

[0010] In some embodiments, the second connection block is a three-way valve, wherein one threaded port is port A, another port is threadedly connected to the first one-way valve, and the last port is threadedly connected to the third connecting pipeline.

[0011] In some embodiments, one port of the filter device assembly is threadedly connected to the first connecting pipe, and another port of the filter device assembly is threadedly connected to the second connecting pipe.

[0012] In some embodiments, the first one-way valve is threadedly connected to the second connecting pipeline, and the second one-way valve is threadedly connected to the third connecting pipeline.

[0013] In a second aspect, the utility model provides a hydraulic system, including the above-mentioned device for cleaning impurities in the gantry oil cylinder.

[0014] In a third aspect, the utility model provides a forklift equipped with the above-mentioned hydraulic system.

[0015] Beneficial effects of the utility model:

[0016] The device can filter the hydraulic oil passing through the mast to prevent the impurities generated by the mast after long-term operation from entering other components and damaging them. The two one-way valves on the device can prevent the oil from flowing back and damaging the components during operation, thus protecting the hydraulic system.

[0017] The device is a detachable structure, and ports A and B are threaded connections. If the entire hydraulic system has enough reserved space, the device can be connected to the system for a long time. If the reserved space is insufficient, the device can be regularly connected to the oil inlet and outlet of the cylinder, and removed after filtering for a period of time to prevent excessive space occupation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0019] In the attached picture:

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 This is the hydraulic principle diagram of the utility model.

[0022] Figure identification: 1-first connecting block, 2-first connecting pipeline, 3-filter device assembly, 4-second connecting pipeline, 5-first one-way valve, 6-second connecting block, 7-third connecting pipeline, 8-second one-way valve.

[0023] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 1 , Figure 2As shown, a device for cleaning impurities in a gantry oil cylinder comprises a first connecting block 1, a first non-return valve 5, a first connecting pipeline 2, a filter device assembly 3, a second connecting block 6, a second connecting pipeline 4, a second non-return valve 8, and a third connecting pipeline 7; the first connecting block 1 is installed on the second non-return valve 8, and the second connecting block 6 is installed on the first non-return valve 5; the first connecting block 1 is connected to the filter device assembly 3 through the first connecting pipeline 2, the filter device assembly 3 is connected to the first non-return valve 5 through the second connecting pipeline 4, and the second connecting block 6 is connected to the second non-return valve 8 through the third connecting pipeline 7; the second connecting block 6 is provided with an A port connected to the multi-way valve, and the first connecting block 1 is provided with a B port connected to the oil inlet of the gantry oil cylinder; when the gantry oil cylinder is in an extended state, the oil enters the gantry oil cylinder through the second non-return valve 8; when the gantry oil cylinder is retracted, the oil enters the multi-way valve through the filter device assembly 3 and the first non-return valve 5.

[0028] Further solutions, such as Figure 2 As shown, the filter assembly 3 consists of a filter, a differential pressure transmitter and a bypass valve. When the oil circuit is blocked and the differential pressure of the inlet and outlet reaches 0.55MPa, the differential pressure transmitter starts to send a signal to remind the operator; when the differential pressure of the inlet and outlet reaches 0.6MPa, the bypass valve opens to protect the entire system.

[0029] Further solutions, such as Figure 1 As shown, the first connection block 1, the first non-return valve 5, the first connection pipeline 2, the filter device assembly 3, the second connection block 6, the second connection pipeline 4, the second non-return valve 8, and the third connection pipeline 7 are all connected in a detachable manner, which is convenient for disassembly and replacement. It can be connected to the oil inlet and outlet of the oil cylinder for a long time, or it can be connected to the oil inlet and outlet of the oil cylinder regularly for filtering, and it needs to be adjusted according to the actual space structure.

[0030] Further solutions, such as Figure 1 As shown, the first connection block 1 is a three-way valve, one of the threaded ports is port B, another port is threadedly connected to the second one-way valve 8, and the last port is threadedly connected to the first connecting pipe 2. The second connection block 6 is a three-way valve, one of the threaded ports is port A, another port is threadedly connected to the first one-way valve 5, and the last port is threadedly connected to the third connecting pipe 7. One port of the filter device assembly 3 is threadedly connected to the first connecting pipe 2, and the other port of the filter device assembly 3 is threadedly connected to the second connecting pipe 4.

[0031] The first one-way valve 5 is threadedly connected to the second connecting pipeline 4 , and the second one-way valve 8 is threadedly connected to the third connecting pipeline 7 .

[0032] The working process of the above-mentioned device for cleaning impurities in the gantry oil cylinder is given below:

[0033] Figure 1The direction of the oil that can pass through the first one-way valve 5 is from bottom to top, and the direction of the oil that can pass through the second one-way valve 8 is from left to right. The device is connected to the gantry hydraulic system, and the oil cylinder used in the gantry is generally a single-acting cylinder. When the oil flows from port A to port B or from port B to port A, the oil can only flow clockwise and cannot flow in both directions at the same time, which can protect the hydraulic system.

[0034] In the device, port A is generally connected to the multi-way valve, and port B is connected to the oil inlet of the mast cylinder. The principle of the utility model is briefly described below. When the device is connected to the mast of a forklift, when the cylinder performs a lifting action, the oil enters the device through port A. Since the oil that can pass through the first one-way valve 5 flows from bottom to top, the oil can only flow clockwise, that is, it passes through the third connecting pipeline 7 and the second one-way valve 8, and then passes through the first connecting block 1, and then flows from port B in the device to the cylinder.

[0035] When the mast oil cylinder is retracted, the oil enters from port B. Since the oil that can pass through the second one-way valve 8 flows from left to right, the oil cannot flow counterclockwise, but can only flow clockwise through the first connecting pipeline 2, then through the filter device assembly 3 and the second connecting pipeline 4, and then through the first one-way valve 5. After filtering the oil that has passed through the oil cylinder, it flows out from port A and flows to other components along the hydraulic system. In this way, when the oil cylinder produces impurities after long-term operation, the filter device assembly 3 can be used to filter the oil when the oil cylinder returns, preventing the impurities from entering the multi-way valve and subsequent components, protecting the components, and extending the service life of the components.

[0036] In this device, the filter assembly 3 is provided with a pressure differential transmitter. When the filter element is blocked by impurities to the point where the pressure differential between the inlet and outlet oil ports is 0.55MPa, a switch signal is sent out. At this time, the filter element should be cleaned or replaced in time to ensure the safety of the system. A bypass valve is provided in the filter assembly 3. When the filter element is blocked by impurities to the point where the pressure differential between the inlet and outlet oil ports is 0.6MPa, or other reasons cause the pressure differential between the inlet and outlet of the filter to be too large, the bypass valve can automatically open the protection system to protect the entire hydraulic system.

[0037] Considering the overall space layout, the device is generally a detachable structure. If the overall hydraulic system has sufficient space, the device can be connected to the system for a long time. If the reserved space of the overall hydraulic system is small, it can be connected to the system regularly and can be removed after filtering for a period of time, which is adjustable and convenient for maintenance.

[0038] The utility model also provides a hydraulic system, comprising the above-mentioned device for cleaning impurities in the mast oil cylinder.

[0039] The utility model also provides a forklift, which is equipped with the hydraulic system mentioned above.

[0040] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0041] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present utility model and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by the present application.

[0042] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this patent can make some changes or modify the technical content suggested above into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of the solution of the utility model.

Claims

1. A device for cleaning impurities in a mast oil cylinder, characterized in that: It includes a first connection block, a first one-way valve, a first connection pipeline, a filter device assembly, a second connection block, a second connection pipeline, a second one-way valve, and a third connection pipeline; The first connection block is installed on the second one-way valve, and the second connection block is installed on the first one-way valve; The first connection block is connected to the filter device assembly via a first connection pipeline, the filter device assembly is connected to the first one-way valve via a second connection pipeline, and the second connection block is connected to the second one-way valve via a third connection pipeline; The second connection block is provided with a port A connected to the multi-way valve, and the first connection block is provided with a port B connected to the oil inlet of the mast cylinder; When the mast oil cylinder is in the extended state, the oil enters the mast oil cylinder through the second one-way valve; When the mast oil cylinder retracts, the oil passes through the filter device assembly and the first one-way valve and enters the multi-way valve.

2. The device for cleaning impurities in a mast oil cylinder according to claim 1, characterized in that: The filter device assembly consists of a filter, a pressure difference transmitter and a bypass valve.

3. The device for cleaning impurities in a mast oil cylinder according to claim 1, characterized in that: The first connecting block, the first one-way valve, the first connecting pipeline, the filter device assembly, the second connecting block, the second connecting pipeline, the second one-way valve, and the third connecting pipeline are all connected in a detachable manner.

4. The device for cleaning impurities in a mast oil cylinder according to claim 3, characterized in that: The first connecting block is a three-way valve, one threaded port of which is port B, another port is threadedly connected to the second one-way valve, and the last port is threadedly connected to the first connecting pipeline.

5. The device for cleaning impurities in a mast oil cylinder according to claim 3, characterized in that: The second connection block is a three-way valve, one threaded port of which is port A, another port is threadedly connected to the first one-way valve, and the last port is threadedly connected to the third connecting pipeline.

6. The device for cleaning impurities in a mast oil cylinder according to claim 3, characterized in that: One port of the filter device assembly is threadedly connected to the first connecting pipeline, and the other port of the filter device assembly is threadedly connected to the second connecting pipeline.

7. The device for cleaning impurities in a mast oil cylinder according to claim 3, characterized in that: The first one-way valve is threadedly connected to the second connecting pipeline, and the second one-way valve is threadedly connected to the third connecting pipeline.

8. A hydraulic system, characterized in that: A device for cleaning impurities from a gantry oil cylinder comprising any one of claims 1 to 7.

9. A forklift, characterized in that: The hydraulic system according to claim 8 is installed.

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