Straight-arm hydraulic control valve group for overhead working truck

Abstract

The utility model relates to a straight arm hydraulic control valve group for an overhead working truck, which comprises a valve block provided with a plurality of oil ports for an oil source to enter and transfer; the electromagnetic valve group is fixedly arranged on the valve block and is used for generating hydraulic kinetic energy for controlling the steering of a high-altitude vehicle and the amplitude variation of a straight arm; the throttle valve is fixed on the valve block, is communicated with the electromagnetic valve group through a flow channel, and is used for adjusting the steering speed of the steering oil cylinder; the overflow valve group is fixed on the valve block, is communicated with the flow channel and is used for adjusting the pressure of the valve group; and the one-way throttle valve is fixedly arranged on the valve block, is connected with the variable-amplitude oil cylinder through a flow channel and is used for controlling the descending speed of the variable-amplitude oil cylinder. The hydraulic control valve set has the effects that the hydraulic control valve set can be reasonably arranged conveniently, and the installation space is reduced.

Description

Technical Field

[0001] This application relates to the field of aerial work platforms, and in particular to a hydraulic control valve assembly for a straight boom of an aerial work vehicle. Background Technology

[0002] Hydraulic control valve assemblies are widely used in many mechanical equipment. For example, when aerial work platforms are performing aerial work, they need to use hydraulic valve assemblies to achieve actions such as extension, leveling, outriggers, and luffing.

[0003] In related technologies, while hydraulic control valves realize functions such as extension, leveling, and amplitude variation, there are certain requirements for the reasonable arrangement and space occupation of hydraulic control valve groups, so as to reduce the space occupation and installation inconvenience of hydraulic control valve groups. Utility Model Content

[0004] To facilitate the rational arrangement of hydraulic control valve groups and reduce installation space, this application provides a hydraulic control valve group for a straight boom aerial work platform.

[0005] The hydraulic control valve assembly for a straight boom aerial work platform provided in this application adopts the following technical solution:

[0006] A hydraulic control valve assembly for a straight boom of an aerial work platform includes:

[0007] The valve block has multiple oil ports for oil to enter and be transmitted;

[0008] The solenoid valve assembly is fixedly mounted on the valve block and is used to generate hydraulic kinetic energy to control the steering of the aerial work platform and the luffing of the boom.

[0009] A throttle valve, fixed on the valve block, is connected to the solenoid valve assembly through a flow channel and is used to adjust the steering speed of the steering cylinder;

[0010] An overflow valve assembly, fixed on the valve block and connected to the flow channel, is used to regulate the valve assembly pressure.

[0011] A one-way throttle valve is fixedly mounted on the valve block and connected to the luffing cylinder through a flow channel. It is used to control the descent speed of the luffing cylinder.

[0012] By adopting the above technical solution, the valve block integrates the solenoid valve assembly, throttle valve, relief valve assembly and one-way throttle valve and connects them through the oil port, so that the solenoid valve assembly can provide the required hydraulic power without occupying space other than the valve block, which helps to reduce the installation space.

[0013] Optionally, the solenoid valve assembly includes a three-position four-way solenoid valve and a two-position four-way solenoid valve that are connected to each other. The three-position four-way solenoid valve is connected to the flow channel, and the two-position four-way solenoid valve is connected to the one-way throttle valve.

[0014] By adopting the above technical solution, the solenoid valve group cooperates with a three-dimensional four-way solenoid valve and a two-position four-way solenoid valve to meet the control of multiple hydraulic kinetic energies. At the same time, the two-dimensional four-way solenoid valve is connected to a one-way throttle valve, thereby protecting the system from the impact of sudden pressure increases and improving the stability and safety of the overall hydraulic system.

[0015] Optionally, the three-position four-way solenoid valve includes a first solenoid valve and a second solenoid valve, wherein the first solenoid valve is connected to the overflow valve group, and the second solenoid valve is electromagnetically connected to the two-position four-way valve.

[0016] By adopting the above technical solution, the three-dimensional four-way solenoid valve is configured with a first solenoid valve and a second solenoid valve to cooperate so that the two three-position four-way solenoid valves can provide sufficient interfaces for hydraulic transmission.

[0017] Optionally, the valve block has oil ports P, T, L, R, Z1, Z2, D1, and D2. The P port is connected to the gear pump oil source of the aerial work platform vehicle, the T port is connected to an external hydraulic oil tank, the L and R ports are connected to the left and right ends of the steering cylinder, the Z1 and Z2 ports are connected to the outrigger cylinders of the aerial work platform vehicle, and the D1 and D2 ports are connected to the luffing and leveling cylinders of the aerial work platform vehicle.

[0018] By adopting the above technical solution, the valve block has multiple corresponding oil ports for different valve bodies and the hydraulic cylinders of the aerial work platform to be connected, thereby enabling reliable hydraulic power transmission after integrating multiple valve bodies.

[0019] Optionally, the overflow valve assembly includes a first overflow valve and a second overflow valve, wherein the first overflow valve is connected to the L port and the second overflow valve is connected to the R port.

[0020] By adopting the above technical solution, the overflow valve assembly, through the cooperation of the first overflow valve and the second overflow valve, can provide protection for the L and R ports when the pressure rises, which helps to reduce the probability of damage to the L and R ports during the pressure rise process.

[0021] Optionally, the maximum flow rate of the oil source input at the P port is 20 liters per minute.

[0022] By adopting the above technical solution, the P port can provide a flow rate of 20 liters per minute to the hydraulic control valve assembly, thereby meeting the oil source demand within 20 liters per minute.

[0023] Optionally, the maximum input pressure of the P port is 25 MPa.

[0024] By adopting the above technical solution, the hydraulic control valve can meet the input pressure requirements within 25 MPa.

[0025] Optionally, the valve block is made of hard alloy.

[0026] By adopting the above technical solution, the valve block is manufactured using hard alloy, which gives the valve block good hardness, making it less prone to damage during use and helping to extend its service life.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The valve block integrates the solenoid valve assembly, throttle valve, relief valve assembly and one-way throttle valve and connects them through the oil port. This allows the solenoid valve assembly to provide the required hydraulic power without occupying space other than the valve block, which helps to reduce the installation space.

[0029] 2. The solenoid valve assembly works in conjunction with a three-dimensional four-way solenoid valve and a two-position four-way solenoid valve to control multiple hydraulic kinetic energies. At the same time, the two-dimensional four-way solenoid valve is connected to a one-way throttle valve, which can protect the system from the impact of sudden pressure increases and improve the stability and safety of the overall hydraulic system.

[0030] 3. The relief valve assembly, through the cooperation of the first relief valve and the second relief valve, provides protection for the L and R ports when the pressure rises, which helps to reduce the probability of damage to the L and R ports during the pressure rise process. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the hydraulic control valve group for the straight boom of the aerial work platform in this application.

[0032] Figure 2 This is a top view of the hydraulic control valve assembly for the straight boom of the aerial work platform vehicle in this application.

[0033] Figure 3 This is a system connection diagram of the hydraulic control valve group for the straight boom of the aerial work platform vehicle in this application.

[0034] Explanation of reference numerals in the attached diagram: 1. Valve block; 11. Oil port; 12. P oil port; 13. T oil port; 14. L oil port; 15. R oil port; 16. Z1 oil port; 17. Z2 oil port; 18. D1 oil port; 19. D2 oil port; 2. Solenoid valve assembly; 21. Three-position four-way solenoid valve; 211. First solenoid valve; 212. Second solenoid valve; 22. Two-position four-way solenoid valve; 3. Throttle valve; 4. Relief valve assembly; 41. First relief valve; 42. Second relief valve; 5. One-way throttle valve. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0036] This application discloses a hydraulic control valve assembly for a straight boom aerial work platform. (Refer to...) Figure 1 and Figure 2 The hydraulic control valve group for the straight boom of the aerial work platform includes a valve block 1 and an interconnected solenoid valve group 2, a throttle valve 3, an overflow valve group 4, and a one-way throttle valve 5 integrated on the valve block 1. This allows each valve body to be pre-installed on the valve block 1 before installing the valve block 1 and the aerial work platform, thus minimizing the space occupied by the valve body outside the valve block 1 and helping to reduce space usage.

[0037] It should be further explained that the aerial work platform is equipped with adjustment mechanisms such as a steering cylinder, a telescopic boom, and a luffing cylinder. The steering cylinder is used to control the horizontal rotation of the aerial work platform, the telescopic boom is used to control the vertical height adjustment of the work platform, and the luffing cylinder is used to control the adjustment speed of the telescopic boom during luffing adjustment. Since the specific structure of the steering cylinder, telescopic boom, and luffing cylinder is not the main inventive concept of this application, the specific structure will not be further described.

[0038] Reference Figure 1 The valve block 1 has multiple oil ports 11 for external oil sources to enter and transmit, so as to realize the regulation of hydraulic power. In order to enable the valve block 1 to have a long service life and not be easily damaged by collision, in this embodiment, the valve block 1 is made of hard metal, specifically hard aluminum alloy.

[0039] Reference Figure 1 and Figure 2 The solenoid valve group 2 includes a three-position four-way solenoid valve 21 and a two-position four-way solenoid valve 22. There are two three-position four-way solenoid valves 21, namely a first solenoid valve 211 and a second solenoid valve 212. The first solenoid valve and the second solenoid valve 212 are respectively connected to the two oil ports 11 of the steering cylinder, so that the steering cylinder can have hydraulic control for two different steering directions. The two-position four-way solenoid valve 22 and the three-position four-way solenoid valve 21 are connected through the oil ports 11 on the valve block 1. The two-position four-way solenoid valve 22 is also connected to the one-way throttle valve 5, which can reduce the pressure increase in the system and play a throttling and buffering role, thereby improving the stability and safety of the hydraulic system.

[0040] Reference Figure 1-3 The throttle valve 3 is connected to the first solenoid valve 211 through the oil port 11 on the valve block 1, so as to perform hydraulic adjustment on the oil circuit of the steering cylinder controlled by the first solenoid valve 211, reduce the impact of sudden hydraulic pressure, and play a role in stabilizing the steering cylinder.

[0041] Referring to the figure, the relief valve assembly 4 includes a first relief valve 41 and a second relief valve 42. The first relief valve 41 and the second relief valve 42 are respectively connected to the two oil ports 11 of the steering cylinder, so as to further improve the stability of the oil circuit where the steering cylinder is located, thereby enabling it to withstand higher hydraulic loads.

[0042] In this embodiment, refer to Figure 1-3 The valve block 1 has oil ports 11 including P, T, L, R, Z1, Z2, D1, and D2. Among them, oil port 11 is connected to the gear pump oil source of the aerial work platform vehicle, oil port 11 is connected to the external hydraulic oil tank, oil ports 11 are connected to the left and right ends of the steering cylinder, oil ports 11 are connected to the outrigger cylinder of the aerial work platform vehicle, and oil ports 11 are connected to the luffing and leveling cylinder of the aerial work platform vehicle.

[0043] In addition, the maximum flow rate of oil input through port P11 is 20 liters per minute, and the maximum input pressure is 25 MPa.

[0044] The implementation principle of a hydraulic control valve group for a straight boom in an aerial work platform according to an embodiment of this application is as follows: by integrating the solenoid valve group 2, throttle valve 3, overflow valve group 4 and one-way throttle valve 5 onto the valve block 1 and connecting them through the corresponding oil ports 11, the valve block 1 can be conveniently arranged and installed on the aerial work platform, and each valve body does not need to plan additional installation space, which helps to reduce space occupation.

[0045] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hydraulic control valve assembly for a straight boom of an aerial work platform, applied to the aerial work platform, wherein the aerial work platform is equipped with a steering cylinder for controlling steering, a telescopic boom for adjusting height, and a luffing cylinder for adjusting the luffing speed of the boom, characterized in that, include: The valve block (1) has multiple oil ports (11) for oil to enter and be transmitted; The solenoid valve assembly (2) is fixedly mounted on the valve block (1) and is used to generate hydraulic kinetic energy to control the steering of the aerial work platform and the luffing of the boom. Throttle valve (3), fixed on the valve block (1), is connected to the solenoid valve group (2) through the flow channel and is used to adjust the steering speed of the steering cylinder; An overflow valve assembly (4) is fixed on the valve block (1) and connected to the flow channel for regulating the valve assembly pressure. A one-way throttle valve (5) is fixedly mounted on the valve block (1) and connected to the luffing cylinder through a flow channel. It is used to control the descent speed of the luffing cylinder.

2. The hydraulic control valve assembly for a straight boom aerial work platform according to claim 1, characterized in that: The solenoid valve group (2) includes a three-position four-way solenoid valve (21) and a two-position four-way solenoid valve (22) that are connected to each other. The three-position four-way solenoid valve (21) is connected to the flow channel, and the two-position four-way solenoid valve is connected to the one-way throttle valve (5).

3. The hydraulic control valve assembly for a straight boom aerial work platform according to claim 2, characterized in that: The three-position four-way solenoid valve (21) includes a first solenoid valve (211) and a second solenoid valve (212). The first solenoid valve (211) is connected to the overflow valve group (4), and the second solenoid valve (212) is electromagnetically connected to the two-position four-way valve.

4. The hydraulic control valve assembly for a straight boom aerial work platform according to claim 3, characterized in that: The valve block (1) has oil ports (11) including P, T, L, R, Z1, Z2, D1, and D2. The P oil port (12) is connected to the gear pump oil source of the aerial work vehicle. The T oil port (13) is connected to the external hydraulic oil tank. The L oil port (14) and R oil port (15) are respectively connected to the left and right ends of the steering cylinder. The Z1 oil port (16) and Z2 oil port (17) are respectively connected to the outrigger cylinder of the aerial work vehicle. The D1 oil port (18) and D2 oil port (19) are respectively connected to the luffing and leveling cylinders of the aerial work vehicle.

5. A hydraulic control valve assembly for a straight boom aerial work platform according to claim 4, characterized in that: The overflow valve assembly (4) includes a first overflow valve (41) and a second overflow valve (42). The first overflow valve (41) is connected to the L port (14), and the second overflow valve (42) is connected to the R port (15).

6. The hydraulic control valve assembly for a straight boom aerial work platform according to claim 1, characterized in that: The maximum flow rate of the oil source input through the P oil port (12) is 20 liters per minute.

7. A hydraulic control valve assembly for a straight boom aerial work platform according to claim 4, characterized in that: The maximum input pressure of the P port (12) is 25 MPa.

8. A hydraulic control valve assembly for a straight boom aerial work platform according to claim 4, characterized in that: The valve block (1) is made of hard alloy.

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