Hydraulic system for cooling hydraulic oil of telescopic forklift truck

Abstract

The utility model relates to a telescopic arm forklift hydraulic oil temperature heat dissipation hydraulic system belongs to telescopic arm forklift production technical field. The oil outlet of gear pump is connected through first control oil circuit with the oil inlet of directional valve intercommunication, the oil outlet of directional valve is connected with telescopic arm forklift hydraulic control multiway valve through main oil supply road, and the gear pump oil outlet is connected through second control oil circuit with the oil inlet of two -way cartridge valve intercommunication, and the oil outlet of two -way cartridge valve is connected back oil line, and the back oil line is installed hydraulic oil radiator, the control oil port of two -way cartridge valve connects bypass oil circuit, and the bypass oil circuit is installed with reversing solenoid valve. The utility model has following beneficial effect: the hydraulic oil is cooled down and is handled after being set up the hydraulic oil radiator on back oil line, and returns to the oil tank, to solve forklift to need long distance walking, gear pump long time work, lead to the problem of return oil tank temperature too high.

Description

Technical Field

[0001] This utility model relates to a hydraulic oil temperature cooling system for telescopic boom forklifts, belonging to the field of telescopic boom forklift manufacturing technology. Background Technology

[0002] Telescopic boom forklifts are a type of multi-purpose engineering machinery with off-road capabilities. Their core feature is the telescopic boom structure, which integrates forklifting, hoisting, and high-altitude operations.

[0003] Current technology is not comprehensive and has the following drawbacks: Because forklifts need to travel long distances, although the working cylinder is not working, the gear pump is still working. The gear pump works for a long time, which will cause the temperature of the return oil tank to be too high, making it difficult to reach thermal equilibrium. The increase in oil temperature will significantly reduce the viscosity of the oil, resulting in poor lubrication performance and accelerated wear of hydraulic components.

[0004] To solve one of the above problems, there is an urgent need for a hydraulic oil temperature cooling system for telescopic boom forklifts. Utility Model Content

[0005] Based on the shortcomings of the existing technology, the technical problem to be solved by this utility model is: how to control the opening and closing of the two-way cartridge valve through the reversing solenoid valve, so that when the working cylinder is not working, the oil supplied by the gear pump enters the two-way cartridge valve through the oil inlet and flows into the return oil pipeline through the oil outlet of the two-way cartridge valve. After the hydraulic oil is cooled by the hydraulic oil cooler installed on the return oil pipeline, it flows back to the oil tank, so as to solve the problem that the temperature of the return oil tank is too high due to the long-distance travel of the forklift and the long-term operation of the gear pump. Therefore, a hydraulic oil temperature cooling system for telescopic boom forklifts is provided.

[0006] The hydraulic oil temperature cooling system for a telescopic boom forklift of this utility model includes a telescopic boom forklift hydraulic control multi-way valve and a gear pump. The two working ports of the telescopic boom forklift hydraulic control multi-way valve are respectively connected to the rodless chamber and the rod chamber of the working cylinder. The oil inlet of the gear pump is connected to the oil tank. The system is characterized in that: the oil outlet of the gear pump is connected to the oil inlet of a directional valve through a first control oil circuit; the oil outlet of the directional valve is connected to the telescopic boom forklift hydraulic control multi-way valve through a main oil supply circuit, supplying oil to the telescopic boom forklift hydraulic control multi-way valve through the main oil supply circuit; the oil outlet of the gear pump is connected to the oil inlet of a two-way cartridge valve through a second control oil circuit; the oil outlet of the two-way cartridge valve is connected to a return oil line, on which a hydraulic oil cooler is installed; the control port of the two-way cartridge valve is connected to a bypass oil line, the other end of which is connected to the oil outlet of the two-way cartridge valve; and a reversing solenoid valve is installed on the bypass oil line.

[0007] Because forklifts need to travel long distances, the gear pump continues to operate even when the hydraulic cylinders are not in use. The prolonged operation of the gear pump will cause the temperature of the return oil tank to become too high, making it difficult to reach thermal equilibrium. The increased oil temperature will significantly reduce the viscosity of the oil, resulting in poor lubrication performance and accelerated wear of hydraulic components. This application addresses the issue of excessively high temperatures in the return oil tank caused by the addition of a two-way cartridge valve and a reversing solenoid valve. When the reversing solenoid valve is de-energized, the inlet and outlet of the two-way cartridge valve are in a non-conductive state. The gear pump normally supplies oil to the hydraulic multi-way valve of the telescopic boom forklift through the directional valve and controls the movement of the working cylinder through the hydraulic multi-way valve. When the reversing solenoid valve is energized, it opens the bypass oil circuit. At this time, the inlet and outlet of the two-way cartridge valve are in a conductive state. The gear pump no longer supplies oil to the directional valve. The oil supplied by the gear pump enters the two-way cartridge valve through the inlet and flows into the return oil line through the outlet. The hydraulic oil is cooled by the hydraulic oil cooler installed on the return oil line and then flows back to the oil tank. This solves the problem of excessively high temperature in the return oil tank caused by the long-distance travel of the forklift and the long-term operation of the gear pump.

[0008] In any of the above embodiments, it is preferred that a first conductive oil circuit is connected between the control port and the outlet port of the directional valve, so that the directional valve becomes a one-way valve, realizing that hydraulic oil can only enter from the inlet port of the directional valve and exit from the inlet port of the directional valve.

[0009] In any of the above embodiments, it is preferred that the reversing solenoid valve is a two-position four-way solenoid valve, and the P port and A port of the reversing solenoid valve are blocked.

[0010] In any of the above embodiments, it is preferred to further include an overflow valve, which is installed on the second conductive oil circuit, and the two ends of the second conductive oil circuit are respectively connected to the control port of the two-way cartridge valve and the outlet port of the two-way cartridge valve.

[0011] In any of the above embodiments, it is preferred that the hydraulic oil cooler is an air-cooled cooler, and only one set is provided. By exchanging heat with the hydraulic oil through forced flow of cold air, the oil temperature can be quickly reduced to the required operating temperature range, ensuring stable operation of the machinery.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The hydraulic oil temperature cooling system for telescopic boom forklifts described in this utility model, by adding a two-way cartridge valve and a reversing solenoid valve, connects the inlet and outlet of the two-way cartridge valve. The oil supplied by the gear pump enters the two-way cartridge valve through the inlet and flows into the return oil pipeline through the outlet. The hydraulic oil is cooled by the hydraulic oil cooler installed on the return oil pipeline and then flows back to the oil tank. This solves the problem of excessively high temperature in the return oil tank caused by the long-distance travel of the forklift and the long-term operation of the gear pump.

[0013] The hydraulic oil temperature cooling system for telescopic boom forklifts described in this utility model controls the on / off state of a two-way cartridge valve through a reversing solenoid valve. It is simple to operate, convenient to use, and extremely safe.

[0014] The hydraulic oil temperature cooling system for telescopic boom forklifts described in this utility model uses an air-cooled radiator, and only one set is provided. By exchanging heat with the hydraulic oil through forced flow of cold air, the oil temperature can be quickly reduced to the required operating temperature range, ensuring stable operation of the machinery. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a partial structural diagram of the present invention; In the diagram: 1. Two-way cartridge valve; 2. Reversing solenoid valve; 3. Overflow valve; 4. Directional valve; 5. Telescopic boom forklift hydraulic multi-way valve; 6. Gear pump; 7. Hydraulic oil cooler; 8. Oil tank. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings. The present invention will be further described below through specific embodiments, but it is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0018] Example 1, as Figure 1-2As shown, the hydraulic oil temperature cooling system for a telescopic boom forklift includes a telescopic boom forklift hydraulic control multi-way valve 5 and a gear pump 6. The two working ports of the telescopic boom forklift hydraulic control multi-way valve 5 are respectively connected to the rodless chamber and the rod chamber of the working cylinder. The oil inlet of the gear pump 6 is connected to the oil tank 8. The oil outlet of the gear pump 6 is connected to the oil inlet of the directional valve 4 through a first control oil circuit. The oil outlet of the directional valve 4 is connected to the telescopic boom forklift hydraulic control multi-way valve through the main oil supply circuit. 5. The main oil supply line supplies oil to the hydraulic multi-way valve 5 of the telescopic boom forklift. The outlet of the gear pump 6 is connected to the inlet of the two-way cartridge valve 1 via a second control oil line. The outlet of the two-way cartridge valve 1 is connected to the return oil line, on which a hydraulic oil cooler 7 is installed. The control port of the two-way cartridge valve 1 is connected to a bypass oil line, the other end of which is connected to the outlet of the two-way cartridge valve 1. A reversing solenoid valve 2 is installed on the bypass oil line. Because the forklift needs to travel long distances, the gear pump 6 continues to operate even when the working cylinder is not in operation. Prolonged operation of the gear pump leads to excessively high temperatures in the return oil tank, making it difficult to reach thermal equilibrium. Increased oil temperature significantly reduces oil viscosity, resulting in poor lubrication performance and accelerated wear of hydraulic components. This application addresses the issue of excessively high temperatures in the return oil tank caused by the addition of a two-way cartridge valve 1 and a reversing solenoid valve 2. When the reversing solenoid valve 2 is de-energized, the inlet and outlet of the two-way cartridge valve 1 are in a non-conductive state. The gear pump 6 normally supplies oil to the hydraulic control multi-way valve 5 of the telescopic boom forklift through the directional valve 4 and controls the movement of the working cylinder through the hydraulic control multi-way valve 5. When the reversing solenoid valve 2 is energized, it opens the bypass oil circuit. At this time, the inlet and outlet of the two-way cartridge valve 1 are in a conductive state. The gear pump 6 no longer supplies oil to the directional valve 4. The oil supplied by the gear pump 6 enters the two-way cartridge valve 1 through the inlet and flows into the return oil pipeline through the outlet. The hydraulic oil is cooled by the hydraulic oil cooler 7 installed on the return oil pipeline and then flows back to the oil tank 8. This solves the problem of excessively high temperature in the return oil tank caused by the long-distance travel of the forklift and the long-term operation of the gear pump.

[0019] Example 2, as Figure 1-2As shown, the hydraulic oil temperature cooling system for a telescopic boom forklift includes a telescopic boom forklift hydraulic control multi-way valve 5 and a gear pump 6. The two working ports of the telescopic boom forklift hydraulic control multi-way valve 5 are respectively connected to the rodless chamber and the rod chamber of the working cylinder. The oil inlet of the gear pump 6 is connected to the oil tank 8. The oil outlet of the gear pump 6 is connected to the oil inlet of the directional valve 4 through a first control oil circuit. The oil outlet of the directional valve 4 is connected to the telescopic boom forklift hydraulic control multi-way valve through the main oil supply circuit. 5. The main oil supply line supplies oil to the hydraulic multi-way valve 5 of the telescopic boom forklift. The oil outlet of the gear pump 6 is connected to the oil inlet of the two-way cartridge valve 1 through the second control oil line. The oil outlet of the two-way cartridge valve 1 is connected to the return oil line. A hydraulic oil cooler 7 is installed on the return oil line. The control oil port of the two-way cartridge valve 1 is connected to the bypass oil line. The other end of the bypass oil line is connected to the oil outlet of the two-way cartridge valve 1. A reversing solenoid valve 2 is installed on the bypass oil line.

[0020] Furthermore, a first conductive oil circuit is connected between the control port and the outlet port of the directional valve 4, making the directional valve 4 a one-way valve, so that hydraulic oil can only enter from the inlet port of the directional valve 4 and exit from the inlet port of the directional valve 4.

[0021] Furthermore, the reversing solenoid valve 2 is a two-position four-way solenoid valve, and the P port and A port of the reversing solenoid valve 2 are blocked.

[0022] Furthermore, it also includes an overflow valve 3, which is installed on the second conductive oil circuit. The two ends of the second conductive oil circuit are respectively connected to the control port of the two-way cartridge valve 1 and the outlet port of the two-way cartridge valve 1.

[0023] Furthermore, the hydraulic oil radiator 7 is an air-cooled radiator, and only one set is provided.

[0024] The hydraulic oil temperature cooling system for telescopic boom forklifts described in this utility model, by adding a two-way cartridge valve and a reversing solenoid valve, connects the inlet and outlet of the two-way cartridge valve. The oil supplied by the gear pump enters the two-way cartridge valve through the inlet and flows into the return oil pipeline through the outlet. The hydraulic oil is cooled by the hydraulic oil cooler installed on the return oil pipeline and then flows back to the oil tank. This solves the problem of excessively high temperature in the return oil tank caused by the long-distance travel of the forklift and the long-term operation of the gear pump.

[0025] The hydraulic oil temperature cooling system for telescopic boom forklifts described in this utility model controls the on / off state of a two-way cartridge valve through a reversing solenoid valve. It is simple to operate, convenient to use, and extremely safe.

[0026] The hydraulic oil temperature cooling system for telescopic boom forklifts described in this utility model uses an air-cooled radiator, and only one set is provided. By exchanging heat with the hydraulic oil through forced flow of cold air, the oil temperature can be quickly reduced to the required operating temperature range, ensuring stable operation of the machinery.

[0027] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

[0028] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A hydraulic oil temperature cooling system for a telescopic boom forklift, comprising a telescopic boom forklift hydraulic control multi-way valve (5) and a gear pump (6), wherein the two working ports of the telescopic boom forklift hydraulic control multi-way valve (5) are respectively connected to the rodless chamber and the rod chamber of the working cylinder, and the oil inlet of the gear pump (6) is connected to an oil tank (8), characterized in that: The outlet of the gear pump (6) is connected to the inlet of the directional valve (4) through the first control oil circuit. The outlet of the directional valve (4) is connected to the telescopic boom forklift hydraulic control multi-way valve (5) through the main oil supply circuit. Oil is supplied to the telescopic boom forklift hydraulic control multi-way valve (5) through the main oil supply circuit. The outlet of the gear pump (6) is connected to the inlet of the two-way cartridge valve (1) through the second control oil circuit. The outlet of the two-way cartridge valve (1) is connected to the return oil pipeline. A hydraulic oil radiator (7) is installed on the return oil pipeline. The control oil port of the two-way cartridge valve (1) is connected to the bypass oil circuit. The other end of the bypass oil circuit is connected to the outlet of the two-way cartridge valve (1). A reversing solenoid valve (2) is installed on the bypass oil circuit.

2. The hydraulic oil temperature cooling system for telescopic boom forklift trucks according to claim 1, characterized in that, A first conductive oil passage is connected between the control oil port of the directional valve (4) and the oil outlet of the directional valve (4).

3. The hydraulic oil temperature cooling system for telescopic boom forklift trucks according to claim 2, characterized in that, The reversing solenoid valve (2) is a two-position four-way solenoid valve, and the P port and A port of the reversing solenoid valve (2) are blocked.

4. The hydraulic oil temperature cooling system for telescopic boom forklift trucks according to claim 3, characterized in that, It also includes an overflow valve (3), which is installed on the second conductive oil circuit. The two ends of the second conductive oil circuit are respectively connected to the control port of the two-way cartridge valve (1) and the outlet port of the two-way cartridge valve (1).

5. The hydraulic oil temperature cooling system for telescopic boom forklift truck according to claim 4, characterized in that, The hydraulic oil radiator (7) is an air-cooled radiator, and only one set is provided.

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