Swing hydraulic system for aerial work platform

Abstract

The utility model relates to the technical field of high-altitude operation equipment, and aims to solve the technical problem that the reaction is not sensitive enough. In order to solve the technical problem, the utility model provides the swing hydraulic system for the aerial work platform. According to the utility model, a motor is connected with an aerial work platform; the balance valve is connected with the motor in series; the oil tank and the motor form a loop through an oil inlet side oil way and an oil return side oil way. An oil inlet of the oil pump communicates with the oil tank; an oil outlet of the oil pump is a P port; the plurality of first electromagnetic directional valves are connected in parallel with the second electromagnetic directional valve; the second electromagnetic directional valve is connected in series with the balance valve; when the first electromagnetic reversing valve is not electrified, the E port, the F port and the T port are communicated; when the second electromagnetic reversing valve is not electrified, the port A, the port B, the port P and the port T are not communicated; the main valve set further comprises a first one-way valve arranged on the oil return side oil way, and the first one-way valve is arranged between the D port and the T port. The device is sensitive in response.

Description

Technical Field

[0001] This utility model relates to the field of aerial work equipment technology, and in particular to a swing hydraulic system for aerial work platforms. Background Technology

[0002] In the field of aerial work, the user experience of aerial work platforms is particularly important as they are used for carrying people at height. Current technologies commonly use articulated and straight boom platform swing mechanisms. When an aerial work platform performs an action, the hydraulic oil in the system travels from the tank to the pump, then to the main valve assembly, and finally to the motor and the platform's piping. However, the highest point of the aerial work platform is quite far from the ground (tens of meters for small models and several tens of meters for large models), resulting in an oil flow rate of 6-8 m / s, which hinders rapid response during actions. Therefore, existing hydraulic systems are not responsive enough during operation (exhibiting a lag). Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the above-mentioned problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, this utility model provides a swing hydraulic system for aerial work platforms, comprising:

[0005] The motor is connected to the aerial work platform;

[0006] A balance valve is connected in series with the motor;

[0007] The oil tank and the motor form a circuit through the oil inlet side oil passage and the oil return side oil passage; the end of the oil inlet side oil passage is provided with a T-port;

[0008] The oil pump is located in the oil inlet side of the oil circuit; the oil inlet of the oil pump is connected to the oil tank; the oil outlet of the oil pump is port P.

[0009] The main valve assembly includes multiple first solenoid directional valves, second solenoid directional valves, and a balancing valve; the multiple first solenoid directional valves are connected in parallel with the second solenoid directional valves; the second solenoid directional valves are connected in series with the balancing valve; the first solenoid directional valves are three-position four-way directional valves; the first solenoid directional valves include ports E, F, G, and H, with port G connected to port P and port H connected to port T; the first solenoid directional valves are not energized, and ports E, F, and T are connected; the second solenoid directional valves are also three-position four-way directional valves; the second solenoid directional valves include ports A, B, C, and D, with port C connected to port P and port D connected to port T; the second solenoid directional valves are not energized, and ports A, B, P, and T are not connected; the main valve assembly also includes a first check valve located on the return oil line, and the first check valve is located between port D and port T.

[0010] In one embodiment of the present invention, the main valve assembly further includes a relief valve connected in parallel between the oil pump and the first solenoid directional valve.

[0011] In one embodiment of this utility model, the main valve group further includes a third solenoid directional valve connected in parallel between the oil pump and the first solenoid directional valve; the third solenoid directional valve is a two-position two-way solenoid directional valve.

[0012] In one embodiment of the present invention, the main valve assembly further includes a second check valve disposed on the oil inlet side oil line; the second check valve is disposed between port P and the first solenoid directional valve.

[0013] In one embodiment of this utility model, this application further includes an oil suction filter disposed on the oil inlet side oil passage; the oil suction filter is disposed between the oil tank and the oil pump.

[0014] In one embodiment of this utility model, this application further includes a return oil filter disposed on the return oil side oil circuit; the return oil filter is disposed between the oil tank and the main valve assembly.

[0015] In one embodiment of this utility model, the filtration accuracy of the suction filter is less than that of the return filter.

[0016] In one embodiment of this utility model, the application also includes a motor, which is connected to the oil pump.

[0017] In one embodiment of this utility model, the oil pump is a gear pump.

[0018] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0019] The swing hydraulic system for aerial work platforms described in this invention effectively locks the hydraulic oil in the pipeline between the main valve assembly and the motor through the coordinated action of a second solenoid directional valve and a first check valve. Thus, when the aerial work platform performs a swinging motion, the hydraulic fluid only needs to pass through the oil tank to the oil pump and either the first or second solenoid directional valve to quickly fill the entire circuit, rapidly reaching the swing motor to execute the action, achieving a highly responsive design. This application has low cost and occupies less space. Attached Figure Description

[0020] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0021] Figure 1 This is a schematic diagram of a swing hydraulic system for an aerial work platform according to a preferred embodiment of the present invention.

[0022] Instruction manual illustration markings: 100, Motor;

[0023] 200. Fuel tank;

[0024] 300. Oil inlet side oil passage;

[0025] 400. Return oil side oil circuit;

[0026] 500, oil pump;

[0027] 600, Main valve assembly; 610, First solenoid directional valve; 620, Second solenoid directional valve; 630, Balancing valve; 640, First check valve; 650, Relief valve; 660, Third solenoid directional valve; 670, Second check valve;

[0028] 700. Oil suction filter;

[0029] 800. Return oil filter;

[0030] 900. Electric motor. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0032] Reference Figure 1 As shown, this utility model embodiment provides a swing hydraulic system for an aerial work platform, comprising:

[0033] Motor 100 is connected to the aerial work platform;

[0034] The oil tank 200 and the motor 100 form a circuit through the oil inlet side oil passage 300 and the oil return side oil passage 400; the end of the oil inlet side oil passage 300 is provided with a T-port;

[0035] Oil pump 500 is located in oil inlet side oil passage 300; oil inlet of oil pump 500 is connected to oil tank 200; oil outlet of oil pump 500 is port P;

[0036] The main valve assembly 600 includes multiple first solenoid directional valves 610 and second solenoid directional valves 620; the multiple first solenoid directional valves 610 and second solenoid directional valves 620 are connected in parallel; the second solenoid directional valve 620, the balance valve 630, and the motor 100 are connected in series; the first solenoid directional valve 610 is a three-position four-way directional valve; the first solenoid directional valve 610 includes ports E, F, G, and H, with port G connected to port P and port H connected to port T; the first solenoid directional valve 610... When energized, ports E, F, and T are connected. The second solenoid directional valve 620 is a three-position four-way directional valve. The second solenoid directional valve 620 includes ports A, B, C, and D, with port C connected to port P and port D connected to port T. When the second solenoid directional valve 620 is de-energized, ports A, B, P, and T are not connected. The main valve assembly 600 also includes a first check valve 640 located on the return oil line 400, positioned between ports D and T. In some embodiments, the opening pressure of the first check valve 640 is 2.5 bar. The balance valve 630 locks the motor 100 in any position and also makes the movement smoother.

[0037] Multiple first electromagnetic reversing valves 610 control various actions of the aerial work platform (e.g., lifting, extension, steering, leveling).

[0038] Specifically, this application utilizes the coordinated action of the second solenoid directional valve 620 and the first check valve 640 to effectively lock the hydraulic oil in the pipeline between the main valve assembly 600 and the motor 100. Thus, when the aerial work platform performs a swinging motion, the hydraulic fluid only needs to reach the oil pump and either the first or second solenoid directional valve to quickly fill the entire circuit, rapidly reaching the swing motor 100 to execute the action, achieving a "sensitive response." This application has low cost and occupies less space.

[0039] Furthermore, the main valve assembly 600 also includes a relief valve 650 connected in parallel between the oil pump 500 and the first solenoid directional valve 610.

[0040] Specifically, the overflow valve 650 in this embodiment can protect the oil pump 500, the second solenoid directional valve 620, the balance valve 630, and the motor 100, thereby improving the service life of the oil pump 500, the second solenoid directional valve 620, the balance valve 630, and the motor 100.

[0041] Furthermore, the main valve assembly 600 also includes a third solenoid directional valve 660 connected in parallel between the oil pump 500 and the first solenoid directional valve 610; the third solenoid directional valve 660 is a two-position two-way solenoid directional valve.

[0042] Specifically, in this embodiment, the third solenoid directional valve 660 can unload the hydraulic system by switching the oil circuit. When the actuator stops working, the third solenoid directional valve 660 is not energized and is in the unloaded position, allowing the oil output by the oil pump 500 to flow directly back to the oil tank 200, and the system pressure is close to zero. This reduces power loss and system heat generation; extends the service life of the oil pump 500 and the motor 900 (described below); avoids frequent start-stop of the motor 900, maintaining a low-pressure standby state; and achieves energy saving.

[0043] Furthermore, the main valve assembly 600 also includes a second check valve 670 located on the oil inlet side oil passage 300; the second check valve 670 is located between port P and the main valve assembly 600.

[0044] Specifically, in this embodiment, a second check valve 670 is provided at the oil outlet of the oil pump 500, which can prevent oil backflow, protect the oil pump 500, and improve the service life of the oil pump 500.

[0045] Furthermore, this application also includes an oil suction filter 700 disposed on the oil inlet side oil passage 300; the oil suction filter 700 is disposed between the oil tank 200 and the oil pump 500.

[0046] Specifically, the suction filter 700 in this embodiment can filter impurities entering the hydraulic system, preventing impurities from entering the system and affecting the normal operation of the hydraulic system.

[0047] Furthermore, this application also includes a return oil filter 800 located in the return oil circuit 400; the return oil filter 800 is located between the oil tank 200 and the first solenoid directional valve 610.

[0048] Specifically, the return oil filter 800 in this embodiment can filter impurities flowing back to the oil tank 200 from the system, preventing impurities from flowing into the oil tank 200 and then into the system, thus affecting the normal operation of the hydraulic system.

[0049] Furthermore, the filtration accuracy of the suction filter 700 is less than that of the return filter 800. In some embodiments, the filtration accuracy of the suction filter 700 is 80µm, and the filtration accuracy of the return filter 800 is 10µm.

[0050] Specifically, this embodiment can prevent impurities from entering the hydraulic system and affecting its normal operation.

[0051] Furthermore, this application also includes a motor 900, which is connected to the oil pump 500.

[0052] Specifically, in this embodiment, the oil pump 500 is driven by the motor 900.

[0053] Furthermore, the oil pump 500 in this application is a gear pump.

[0054] Specifically, it has a simple structure and is easy to manufacture; it is inexpensive, small in size, and light in weight; it has good self-priming properties and is not sensitive to oil contamination; and it is reliable in operation.

[0055] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A swing hydraulic system for aerial work platforms, characterized in that: include: The motor is connected to the aerial work platform; A balance valve is connected in series with the motor; The oil tank and the motor form a circuit through the oil inlet side oil passage and the oil return side oil passage; the end of the oil inlet side oil passage is provided with a T-port; An oil pump is installed in the oil inlet side oil circuit; the oil inlet of the oil pump is connected to the oil tank; the oil outlet of the oil pump is port P. The main valve assembly includes multiple first solenoid directional valves and second solenoid directional valves; the multiple first solenoid directional valves and the second solenoid directional valves are connected in parallel; the second solenoid directional valves are connected in series with the balance valve; the first solenoid directional valves are three-position four-way directional valves; the first solenoid directional valves include ports E, F, G, and H, with port G connected to port P and port H connected to port T; the first solenoid directional valves are not energized, and ports E, F, and T are connected; the second solenoid directional valves are three-position four-way directional valves; the second solenoid directional valves include ports A, B, C, and D, with port C connected to port P and port D connected to port T; the second solenoid directional valves are not energized, and ports A, B, P, and T are not connected; the main valve assembly also includes a first check valve located on the return oil line, and the first check valve is located between port D and port T.

2. The swing hydraulic system for an aerial work platform according to claim 1, characterized in that: The main valve assembly also includes a relief valve connected in parallel between the oil pump and the first solenoid directional valve.

3. The swing hydraulic system for an aerial work platform according to claim 1, characterized in that: The main valve assembly also includes a third solenoid directional valve connected in parallel between the oil pump and the first solenoid directional valve; the third solenoid directional valve is a two-position two-way solenoid directional valve.

4. The swing hydraulic system for an aerial work platform according to claim 1, characterized in that: The main valve assembly also includes a second check valve located on the oil inlet side oil line; the second check valve is located between the P port and the first solenoid directional valve.

5. The swing hydraulic system for an aerial work platform according to claim 1, characterized in that: It also includes an oil suction filter located in the oil inlet side oil passage; the oil suction filter is located between the oil tank and the oil pump.

6. The swing hydraulic system for an aerial work platform according to claim 5, characterized in that: It also includes a return oil filter located in the return oil circuit on the return side; the return oil filter is located between the oil tank and the main valve assembly.

7. The swing hydraulic system for an aerial work platform according to claim 6, characterized in that: The filtration accuracy of the suction filter is less than that of the return filter.

8. The swing hydraulic system for an aerial work platform according to claim 1, characterized in that: It also includes a motor, which is connected to the oil pump.

9. The swing hydraulic system for an aerial work platform according to claim 1, characterized in that: The oil pump is a gear pump.

Images