CN213976861U - Hydraulic system for forklift - Google Patents
Hydraulic system for forklift Download PDFInfo
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- CN213976861U CN213976861U CN202022353521.9U CN202022353521U CN213976861U CN 213976861 U CN213976861 U CN 213976861U CN 202022353521 U CN202022353521 U CN 202022353521U CN 213976861 U CN213976861 U CN 213976861U
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- hydraulic
- inlet pipeline
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Abstract
The utility model provides a hydraulic system for fork truck is last, relates to the hydraulic system on the conveying equipment to two pneumatic cylinders on solving current fork truck lift asynchronous, can cause the problem that the fork is stuck. The utility model comprises a lifting hydraulic oil circuit, which comprises a main pipeline, a first oil inlet pipeline, a second oil inlet pipeline, an oil return pipeline, an electromagnetic valve, a bridge type flow control valve component, a controller, two linear displacement sensors and two hydraulic cylinders; the electromagnetic valve is arranged on the main pipeline and the oil return pipeline, the first oil inlet pipeline and the second oil inlet pipeline are respectively communicated with the oil outlet end of the electromagnetic valve on the main pipeline, and the first oil inlet pipeline is communicated with the oil inlet port on one hydraulic cylinder. The utility model discloses a linear displacement sensor detects the stroke of pneumatic cylinder, produces feedback signal and gives the controller, gives the governing valve on the bridge type flow control valve subassembly through controller output signal, adjusts the flow size in the oil circuit, makes two pneumatic cylinders keep in step.
Description
Technical Field
The utility model relates to a hydraulic system, concretely relates to last hydraulic system of fork truck.
Background
A fork truck among the prior art, the fork setting is at fork truck's lateral part to realize flexible through the pneumatic cylinder, when the transport goods, then stretch out from the fork truck lateral part, on carrying fork truck with the goods, contract original position again. The fork on the existing forklift adopts two double-acting hydraulic cylinders to lift, and the pressure in two hydraulic cylinder pipelines is not completely the same in the lifting process, so that the hydraulic cylinders lift asynchronously, and the phenomenon that the fork is clamped on a portal frame can be caused.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve two pneumatic cylinders on the current fork truck and lift asynchronous, can cause the problem that the fork was stuck, and provide a hydraulic system for on the fork truck.
The utility model discloses a solve the technical scheme that above-mentioned technical problem took and be:
a hydraulic system for a forklift comprises a lifting hydraulic oil way, wherein the lifting hydraulic oil way comprises a main pipeline, a first oil inlet pipeline, a second oil inlet pipeline, an oil return pipeline, an electromagnetic valve, a bridge type flow control valve assembly, a controller, two linear displacement sensors and two hydraulic cylinders;
the electromagnetic valve is arranged on the main pipeline and the oil return pipeline, the first oil inlet pipeline and the second oil inlet pipeline are respectively communicated with the oil outlet end of the electromagnetic valve on the main pipeline, the first oil inlet pipeline is communicated with the oil inlet port on one hydraulic cylinder, the second oil inlet pipeline is communicated with the oil inlet port on the other hydraulic cylinder, the oil outlet ends of the two hydraulic cylinders are communicated with the oil return pipeline, a set of bridge type flow control valve component is respectively arranged on the first oil inlet pipeline and the second oil inlet pipeline, each hydraulic cylinder is provided with a linear displacement sensor for detecting the displacement of a cylinder rod of the hydraulic cylinder, the linear displacement sensor is connected with the displacement detection port on the controller, and the displacement detection output port of the controller is connected with respective speed regulating valves on the two bridge type flow control valve components.
Preferably, the main line is provided with an oil tank, a filter and a hydraulic pump in sequence along a flow direction of the hydraulic oil.
Preferably, the oil outlet end of the electromagnetic valve on the oil return pipeline is provided with a pressure maintaining electromagnetic valve.
Preferably, the main pipeline is also provided with a relief valve.
Preferably, the hydraulic system for the forklift further comprises an oil inlet pipeline a and an oil return pipeline a, a bridge type flow control valve assembly a, a plurality of branch pipelines and a plurality of hydraulic cylinders a, the oil inlet pipeline a and the oil return pipeline a are provided with electromagnetic valves a for controlling oil inlet and oil return of hydraulic oil, the oil inlet pipeline a is communicated with an oil inlet side pipeline of the electromagnetic valve on the main pipeline, a pipeline on an oil outlet side of the electromagnetic valve a on the oil inlet pipeline a is communicated with the plurality of branch pipelines, the bridge type flow control valve assembly a is arranged on a pipeline on an oil outlet side of the electromagnetic valve a on the oil inlet pipeline a, each branch pipeline is communicated with an oil inlet of each hydraulic cylinder a, and an oil outlet of each hydraulic cylinder a is communicated with the oil return pipeline a.
Preferably, a pressure maintaining solenoid valve a is arranged on the oil return pipeline a.
Compared with the prior art, the utility model following beneficial effect has:
the utility model discloses a linear displacement sensor detects the stroke of pneumatic cylinder, compares through the stroke, produces feedback signal and gives the controller, gives the governing valve on the bridge type flow control valve subassembly through controller output signal, adjusts the flow size in the oil circuit, makes two pneumatic cylinders keep synchronous, avoids the problem of being stuck at the lift in-process.
Two, the utility model discloses set up the pressurize solenoid valve, kept the pressure in the oil circuit, can make the fork keep certain gesture when the process of lifting stops, the return circuit is direct when not needing the pressurize and the oil tank switch-on prevents the overheated and function that reduces hydraulic system power consumption of system.
Drawings
FIG. 1 is a schematic diagram of a hydraulic circuit according to the present invention;
FIG. 2 is a schematic view of a bridge flow control valve assembly 6;
fig. 3 is a block diagram of the connection relationship among the controller, the linear displacement sensor and the speed regulating valve.
Reference numerals: 1. a main pipeline; 2. a first oil inlet pipeline; 3. a second oil inlet pipeline; 4. an oil return line; 5. an electromagnetic valve; 6. a bridge flow control valve assembly; 8. a linear displacement sensor; 9. a hydraulic cylinder; 10. an oil tank; 11. a filter; 12. a hydraulic pump; 13. an overflow valve; 14. a pressure maintaining electromagnetic valve; 15. an oil inlet pipeline a; 16. a branch line; 17; a hydraulic cylinder a; 18. an oil return pipeline a; 19. an electromagnetic valve a; 20. a bridge flow control valve assembly a; 21. a pressure maintaining electromagnetic valve a; 22. a one-way valve; 23. a speed regulating valve.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of the present invention is not limited to the following embodiments.
Example 1: the embodiment is described below with reference to fig. 1 to fig. 3, and the embodiment relates to a hydraulic system for a forklift, which includes a lifting hydraulic oil path, where the lifting hydraulic oil path includes a main pipeline 1, a first oil inlet pipeline 2, a second oil inlet pipeline 3, an oil return pipeline 4, an electromagnetic valve 5, a bridge type flow control valve assembly 6, a controller, two linear displacement sensors 8, and two hydraulic cylinders 9;
the electromagnetic valve 5 is arranged on the main pipeline 1 and the oil return pipeline 4, the first oil inlet pipeline 2 and the second oil inlet pipeline 3 are respectively communicated with an oil outlet end of the electromagnetic valve 5 on the main pipeline 1, the first oil inlet pipeline 2 is communicated with an oil inlet port on one hydraulic cylinder 9, the second oil inlet pipeline 3 is communicated with an oil inlet port on the other hydraulic cylinder 9, oil outlet ends of the two hydraulic cylinders 9 are communicated with the oil return pipeline 4, a set of bridge type flow control valve assembly 6 is respectively arranged on the first oil inlet pipeline 2 and the second oil inlet pipeline 3, a linear displacement sensor 8 for detecting the displacement of a cylinder rod of the hydraulic cylinder 9 is arranged on each hydraulic cylinder 9, the linear displacement sensor 8 is connected with a displacement detection port on the controller, and displacement detection output ports of the controller are connected with respective speed regulating valves 23 on the two bridge type flow control valve assemblies 6.
As shown in fig. 2, which is a schematic diagram of the bridge type flow control valve assembly 6, the bridge type flow control valve assembly 6 is composed of four check valves 22 and a speed regulating valve 23, and belongs to the prior art, wherein the speed regulating valve 23 is an electro-hydraulic proportional speed regulating valve.
The controller is STM32F103VET 6.
The main pipeline 1 is provided with an oil tank 10, a filter 11 and a hydraulic pump 12 in sequence along the flowing direction of the hydraulic oil.
And a pressure maintaining electromagnetic valve 14 is arranged at the oil outlet end of the electromagnetic valve 5 on the oil return pipeline 4.
When the pressure in the oil circuit exceeds the preset pressure, an overflow valve 13 is arranged on the main pipeline 1, and the hydraulic oil in the pipeline is decompressed and returned to the oil tank 10.
The hydraulic cylinder control system further comprises an oil inlet pipeline a15, an oil return pipeline a18, a bridge type flow control valve assembly a20, a plurality of branch pipelines 16 and a plurality of hydraulic cylinders a17, wherein electromagnetic valves a19 for controlling oil inlet and oil return of hydraulic oil are arranged on the oil inlet pipeline a15 and the oil return pipeline a18, the oil inlet pipeline a15 is communicated with a pipeline on the oil inlet side of the electromagnetic valve 5 on the main pipeline 1, a pipeline on the oil outlet side of the electromagnetic valve a19 on the oil inlet pipeline a15 is communicated with the plurality of branch pipelines 16, the bridge type flow control valve assembly a20 is arranged on a pipeline on the oil outlet side of the electromagnetic valve a19 on the oil inlet pipeline a15, each branch pipeline 16 is communicated with an oil inlet of each hydraulic cylinder a17, and an oil outlet of each hydraulic cylinder a17 is communicated with the oil return pipeline a 18.
Alternatively, the number of the hydraulic oil cylinders a17 may be more than one, or 1, as required.
And a pressure maintaining electromagnetic valve a21 is arranged on the oil return pipeline a 18.
The only difference between the bridge flow control valve assembly a20 and the bridge flow control valve assembly 6 is that: the speed control valve 23 on the bridge flow control valve assembly a20 uses a manual speed control valve to adjust the oil flow rate to control the speed of the fork extension and retraction.
The hydraulic oil in the oil return line 4 returns to the oil tank 10 through the pressure maintaining solenoid valve 14, and the hydraulic oil in the oil return line a18 returns to the oil tank through the pressure maintaining solenoid valve a 21. When the hydraulic cylinder 9 or the hydraulic cylinder a17 needs to hold pressure, the holding pressure solenoid valve 14 or the holding pressure solenoid valve 14 is closed.
In this embodiment, pressure sensors may be disposed on the main pipeline 1, the first oil inlet pipeline 2, and the second oil inlet pipeline 3 to detect the pressure on the oil path.
The hydraulic cylinder 9 and the hydraulic cylinder a17 are both double-acting hydraulic cylinders.
In this embodiment, the solenoid valve a19 and the solenoid valve 5 are both three-position four-way solenoid directional valves, and the pressure maintaining solenoid valve a21 and the pressure maintaining solenoid valve 14 are both two-position two-way solenoid directional valves.
Although the present invention has been described in detail with reference to certain specific embodiments, it will be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (6)
1. A hydraulic system for a forklift is characterized by comprising a lifting hydraulic oil way, wherein the lifting hydraulic oil way comprises a main pipeline (1), a first oil inlet pipeline (2), a second oil inlet pipeline (3), an oil return pipeline (4), an electromagnetic valve (5), a bridge type flow control valve assembly (6), a controller, two linear displacement sensors (8) and two hydraulic cylinders (9);
the electromagnetic valve (5) is arranged on the main pipeline (1) and the oil return pipeline (4), the first oil inlet pipeline (2) and the second oil inlet pipeline (3) are respectively communicated with the oil outlet end of the electromagnetic valve (5) on the main pipeline (1), the first oil inlet pipeline (2) is communicated with the oil inlet port on one hydraulic cylinder (9), the second oil inlet pipeline (3) is communicated with the oil inlet port on the other hydraulic cylinder (9), the oil outlet ends of the two hydraulic cylinders (9) are communicated with the oil return pipeline (4), the first oil inlet pipeline (2) and the second oil inlet pipeline (2)
(3) The hydraulic control system is characterized in that a set of bridge type flow control valve components (6) are arranged on the hydraulic cylinder, each hydraulic cylinder (9) is provided with a linear displacement sensor (8) used for detecting the displacement of a cylinder rod of each hydraulic cylinder (9), the linear displacement sensors (8) are connected with displacement detection ports on the controller, and displacement detection output ports of the controller are connected with respective speed regulating valves (23) on the two bridge type flow control valve components (6).
2. A hydraulic system for a fork lift truck according to claim 1, characterized in that the main line (1) is provided with an oil tank (10), a filter (11) and a hydraulic pump (12) in the order of the flow direction of the hydraulic oil.
3. A hydraulic system for a fork lift truck according to claim 1, characterized in that the outlet end of the solenoid valve (5) on the return line (4) is provided with a pressure maintaining solenoid valve (14).
4. A hydraulic system for a fork lift truck according to claim 1, characterized in that the main line (1) is further provided with an overflow valve (13).
5. The hydraulic system for the forklift according to claim 1, further comprising an oil inlet pipeline a (15) and an oil return pipeline a (18), a bridge type flow control valve assembly a (20), a plurality of branch pipelines (16) and a plurality of hydraulic cylinders a (17), wherein the oil inlet pipeline a (15) and the oil return pipeline a (18) are provided with electromagnetic valves a (19) for controlling oil inlet and oil return of hydraulic oil, the oil inlet pipeline a (15) is communicated with an oil inlet side pipeline of the electromagnetic valve (5) on the main pipeline (1), a pipeline on an oil outlet side of the electromagnetic valve a (19) on the oil inlet pipeline a (15) is communicated with the plurality of branch pipelines (16), and a bridge type flow control valve assembly a is arranged on a pipeline on an oil outlet side of the electromagnetic valve a (19) on the oil inlet pipeline a (15)
(20) Each branch pipeline (16) is communicated with an oil inlet of each hydraulic cylinder a (17), and an oil outlet of each hydraulic cylinder a (17) is communicated with an oil return pipeline a (18).
6. The hydraulic system for the forklift according to claim 5, wherein the oil return line a (18) is provided with a pressure maintaining solenoid valve a (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022353521.9U CN213976861U (en) | 2020-10-21 | 2020-10-21 | Hydraulic system for forklift |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022353521.9U CN213976861U (en) | 2020-10-21 | 2020-10-21 | Hydraulic system for forklift |
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| Publication Number | Publication Date |
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| CN213976861U true CN213976861U (en) | 2021-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022353521.9U Active CN213976861U (en) | 2020-10-21 | 2020-10-21 | Hydraulic system for forklift |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115163600A (en) * | 2022-09-07 | 2022-10-11 | 浙大城市学院 | Large-range nanoscale positioning system based on fluid control |
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2020
- 2020-10-21 CN CN202022353521.9U patent/CN213976861U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115163600A (en) * | 2022-09-07 | 2022-10-11 | 浙大城市学院 | Large-range nanoscale positioning system based on fluid control |
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Effective date of registration: 20211222 Address after: Room 211, 1-3 / F, building C, 140 Dacheng street, Nangang District, Harbin City, Heilongjiang Province Patentee after: Harbin liangdun Technology Co.,Ltd. Address before: Room a205-6, building a, building 2, innovation and entrepreneurship Plaza, science and technology innovation city, high tech Industrial Development Zone, Harbin, Heilongjiang Province Patentee before: HARBIN SHENGSHI KANGHONG BIOTECHNOLOGY CO.,LTD. |