Aerial work platform with single-ratio flow valve linkage control system

Abstract

This utility model relates to a linkage control system for a single proportional flow valve aerial work platform, belonging to the field of aerial work platforms. The single-axis operating handle, upper arm undulation switch, lower arm undulation switch, telescopic switch, rotary switch, switching valve assembly, single proportional flow valve, and throttle in this utility model are all connected to a programmable controller. Its structural features are as follows: the switching valve assembly includes an upper arm undulation valve assembly, a lower arm undulation valve assembly, a telescopic valve assembly, and a rotary valve assembly. The upper arm undulation valve assembly is connected to one end of an upper arm undulation plug, and the other end of the upper arm undulation plug is connected to an upper arm undulation cylinder. The lower arm undulation valve assembly is connected to one end of a lower arm undulation plug, and the other end of the lower arm undulation plug is connected to a lower arm undulation cylinder. The telescopic valve assembly is connected to one end of a telescopic plug, and the other end of the telescopic plug is connected to a telescopic cylinder. The rotary valve assembly is connected to one end of a rotary plug, and the other end of the rotary plug is connected to a rotary motor. The programmable controller is equipped with a controller debugging interface.

Description

Technical Field

[0001] This utility model relates to a linkage control system for a single proportional flow valve aerial work platform vehicle, belonging to the field of aerial work platform vehicles. Background Technology

[0002] As the market demands higher performance from aerial work platforms, in scenarios such as emergency repairs, large-scale engineering installations, and bridge maintenance, aerial work platforms are required to perform multiple actions simultaneously to quickly complete tasks. Existing aerial work platforms cannot achieve coordinated operation of high-altitude actions.

[0003] Traditional aerial work platforms controlled by single proportional flow valves were initially designed to strictly restrict the linkage of aerial actions. This was because, on the one hand, the control characteristics of single proportional flow valves made it difficult to accurately meet the needs of multiple actions to be performed simultaneously in terms of flow distribution and pressure regulation. If linkage was forced, it would lead to uncoordinated actions, resulting in problems such as inconsistent action speed and reduced action accuracy. On the other hand, to ensure safety, the control program prohibited the linkage of multiple actions.

[0004] Specifically, when operators need to extend or retract the boom, they cannot simultaneously perform boom raising or lowering or slewing movements. To adjust the boom's raising or lowering angle, other actions such as extension, retraction, or slewing must be stopped first. This sequential operation of individual actions not only increases the labor intensity of operators during complex high-altitude positioning operations but also reduces the flexibility and accuracy of the operation to some extent.

[0005] The control system of the actuator of a traditional single-proportional flow valve aerial work platform: After the speed control signal of the single-axis operating handle 2 and the upper arm raising / lowering operation command of the upper arm raising / lowering switch 3 are input into the programmable controller 1, the programmable controller 1 processes the program and controls the opening of the upper arm raising / lowering valve group 11 in the switching valve group 7 and the opening amount of the single-proportional flow valve 8. In turn, the upper arm raising / lowering action is performed by the actuators such as the upper arm raising / lowering cylinder 16. At the same time, the throttle 9 is output to control the chassis engine speed at low / high speed. Similarly, the speed control signal of the single-axis operating handle 2 and the lower arm raising / lowering operation command of the lower arm raising / lowering switch 4 are respectively controlled by the actuators. A single combination of the operation command, the telescopic switch 5's telescopic / retractable operation command, or the rotary switch 6's rotary forward / reverse operation command controls the opening amount of the corresponding lower arm undulation valve group 12, telescopic valve group 13, or rotary valve group 14 in the switching valve group 7, and the opening amount of the single proportional flow valve 8. This, in turn, causes the boom to move through actuators such as the lower arm undulation cylinder 18, telescopic cylinder 20, or rotary motor 22. If there are ≥2 operation commands from the upper arm undulation switch 3, lower arm undulation switch 4, telescopic switch 5, and rotary switch 6, the programmable controller 1 program will prohibit the output of the switching valve group 7 and the single proportional flow valve 8. Utility Model Content

[0006] The purpose of this invention is to overcome the above-mentioned deficiencies in the existing technology and provide a single proportional flow valve linkage control system for aerial work platforms with a reasonable structural design. By removing the action interlock mechanism in the control program, the relationship between the required flow rate and throttle speed during multiple actions is optimized. In addition, a screw plug is added to the hydraulic branch of the action actuator to change the pressure loss and flow distribution characteristics of the oil circuit, so that the single proportional flow valve hydraulic system has the ability to control multiple actions in a linkage manner.

[0007] The technical solution adopted by this utility model to solve the above problems is as follows: The proportional flow valve aerial work platform linkage control system includes a programmable controller, a single-axis operating handle, an upper arm elevation switch, a lower arm elevation switch, a telescopic switch, a rotary switch, a valve assembly, a single proportional flow valve, and a throttle. The single-axis operating handle, upper arm elevation switch, lower arm elevation switch, telescopic switch, rotary switch, valve assembly, single proportional flow valve, and throttle are all connected to the programmable controller. Its structural feature is that the valve assembly includes an upper arm elevation valve assembly. The system comprises a lower arm undulation valve assembly, a telescopic valve assembly, and a rotary valve assembly. The upper arm undulation valve assembly is connected to one end of the upper arm undulation plug, and the other end of the upper arm undulation plug is connected to the upper arm undulation cylinder. The lower arm undulation valve assembly is connected to one end of the lower arm undulation plug, and the other end of the lower arm undulation plug is connected to the lower arm undulation cylinder. The telescopic valve assembly is connected to one end of the telescopic plug, and the other end of the telescopic plug is connected to the telescopic cylinder. The rotary valve assembly is connected to one end of the rotary plug, and the other end of the rotary plug is connected to the rotary motor.

[0008] Furthermore, the programmable controller is equipped with a controller debugging interface.

[0009] Compared with the prior art, this utility model has the following advantages: The screw plugs added to the branch oil circuits of each actuator increase the local resistance of the oil circuit. Under the condition that the output pressure of the single proportional flow valve is constant, the pressure loss generated when the hydraulic oil flows through the screw plugs is different. In addition, the screw plugs are also different in size, so the speed of each branch oil circuit is different. By adding screw plugs to the branch oil circuits, the pressure and flow between each actuator can be redistributed.

[0010] Without increasing hardware costs (replacing the single proportional flow valve), the system can meet users' customized needs for the linkage of aerial work platform operations with single proportional flow valves; on-site modifications are simple for users, and the control effect of multiple proportional valves can be achieved by upgrading the control program and adding plugs to the branch oil circuits; through the parameter settings of the programmable controller debugging software, users can choose whether the aerial work operations need to be linked. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the electrical principle of the linkage control system of the single proportional flow valve aerial work vehicle according to an embodiment of this utility model.

[0012] Figure 2 This is a schematic diagram of the connection relationship of the linkage control system of the single proportional flow valve aerial work vehicle according to an embodiment of this utility model.

[0013] In the diagram: 1. Programmable controller; 2. Single-axis operating handle; 3. Upper arm undulation switch; 4. Lower arm undulation switch; 5. Telescopic switch; 6. Rotary switch; 7. Switch valve assembly; 8. Single proportional flow valve; 9. Throttle; 10. Controller debugging interface; 11. Upper arm undulation valve assembly; 12. Lower arm undulation valve assembly; 13. Telescopic valve assembly; 14. Rotary valve assembly; 15. Upper arm undulation plug; 16. Upper arm undulation cylinder; 17. Lower arm undulation plug; 18. Telescopic plug; 19. Telescopic cylinder; 20. Rotary plug; 21. Rotary motor; 22. Detailed Implementation

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and through embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0015] Example

[0016] See Figures 1 to 2 As shown in the accompanying drawings, the structures, proportions, sizes, etc., depicted in this specification are merely for illustrative purposes to aid those skilled in the art and to provide a clear understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the use of terms such as "upper," "lower," "left," "right," "middle," and "one" in this specification is solely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0017] The single proportional flow valve aerial work platform linkage control system in this embodiment includes a programmable controller 1, a single-axis operating handle 2, an upper arm elevation switch 3, a lower arm elevation switch 4, a telescopic switch 5, a rotary switch 6, a switching valve group 7, a single proportional flow valve 8, and a throttle 9. The single-axis operating handle 2, the upper arm elevation switch 3, the lower arm elevation switch 4, the telescopic switch 5, the rotary switch 6, the switching valve group 7, the single proportional flow valve 8, and the throttle 9 are all connected to the programmable controller 1. The programmable controller 1 is provided with a controller debugging interface 10.

[0018] The switching valve assembly 7 in this embodiment includes an upper arm undulation valve assembly 11, a lower arm undulation valve assembly 12, a telescopic valve assembly 13, and a rotary valve assembly 14. The upper arm undulation valve assembly 11 is connected to one end of the upper arm undulation plug 15, and the other end of the upper arm undulation plug 15 is connected to the upper arm undulation cylinder 16. The lower arm undulation valve assembly 12 is connected to one end of the lower arm undulation plug 17, and the other end of the lower arm undulation plug 17 is connected to the lower arm undulation cylinder 18. The telescopic valve assembly 13 is connected to one end of the telescopic plug 19, and the other end of the telescopic plug 19 is connected to the telescopic cylinder 20. The rotary valve assembly 14 is connected to one end of the rotary plug 21, and the other end of the rotary plug 21 is connected to the rotary motor 22.

[0019] Specifically, the linkage control system of the single proportional flow valve aerial work platform is based on the traditional single proportional flow valve aerial work platform actuator control system. The programmable controller 1 program adopts collaborative control logic. By setting the min and max values ​​of the single-axis operating handle 2 control signal of each actuator and the maximum demand flow value Q of each actuator in the debugging software, the real-time flow of the action of a single actuator is calculated. The total flow demand is obtained by superimposing the flow demands of each actuator.

[0020] When there are ≥2 operation commands for the upper arm undulation switch 3, lower arm undulation switch 4, telescopic switch 5, and rotary switch 6, the programmable controller 1 will open the corresponding actuator valve in the switching valve group 7 (i.e., upper arm undulation valve group 11, lower arm undulation valve group 12, telescopic valve group 13, or rotary valve group 14). Based on the handle ratio of each action command input by the single-axis operating handle 2, the PWM current parameter is set separately to adjust the opening of the single proportional flow valve 8, thereby changing the total flow into the main oil circuit. At the same time, the programmable controller 1 will perform linear interpolation calculation between the total flow and the throttle output signal, and output the throttle low / high speed of the throttle 9 to control the speed of the chassis engine.

[0021] The controller debugging interface 10 will have a function option to "enable multiple action linkage" to facilitate the needs of individual action users.

[0022] The programmable controller 1 releases the action interlock logic in the control program and optimizes the action flow demand in the linkage state. Through the operation instructions of a single action or multiple actions, it realizes the opening of the upper arm undulation valve group 11, lower arm undulation valve group 12, telescopic valve group 13 or rotary valve group 14 in the switching valve group 7, the opening amount of the single proportional flow valve 8, and the low-speed or high-speed output of the throttle 9.

[0023] This single proportional flow valve aerial work platform linkage control system is based on the electrical and hydraulic principles of the aerial work platform controlled by the single proportional flow valve. It eliminates the restriction on the linkage of aerial actions, enabling the system to receive and process multiple action commands, calculate the action flow demand parameters of each actuator in the linkage state, and then control the throttle speed to achieve the optimal control of the single proportional flow valve linkage.

[0024] Based on the flow and pressure requirements of the linkage action, the oil circuit is analyzed and optimized. Screw plugs are added at the control oil circuit branches of each action actuator to change the flow characteristics of the oil circuit. The addition of screw plugs can adjust the pressure distribution and flow distribution in the oil circuit, so that each action can obtain a stable pressure and flow supply when it is executed.

[0025] Typically, the programmable controller 1 is model EQP100-1, the single-axis operating handle 2 is model S30JLK-X1-10R1GH, the single proportional flow valve 8 is model XQ3C3HM3EF002, and the upper arm undulating valve group 11, lower arm undulating valve group 12, telescopic valve group 13, and rotary valve group 14 are model DHI-0713-X12DC or WDMFA06-ADB-G12 / WD or BED-06J-12DKX-M.

[0026] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components. The above description is merely illustrative of the structure of this utility model. All equivalent or simple variations made based on the structure, features, and principles described in this utility model are included within the protection scope of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, as long as they do not deviate from the structure of this utility model or exceed the scope defined by the claims, all of which should fall within the protection scope of this utility model.

Claims

1. A linkage control system for a single proportional flow valve aerial work platform, comprising a programmable controller (1), a single-axis operating handle (2), an upper arm elevation switch (3), a lower arm elevation switch (4), a telescopic switch (5), a rotary switch (6), a switching valve assembly (7), a single proportional flow valve (8), and a throttle (9), wherein the single-axis operating handle (2), the upper arm elevation switch (3), the lower arm elevation switch (4), the telescopic switch (5), the rotary switch (6), the switching valve assembly (7), the single proportional flow valve (8), and the throttle (9) are all connected to the programmable controller (1), characterized in that: The switching valve assembly (7) includes an upper arm undulation valve assembly (11), a lower arm undulation valve assembly (12), a telescopic valve assembly (13), and a rotary valve assembly (14). The upper arm undulation valve assembly (11) is connected to one end of the upper arm undulation plug (15), and the other end of the upper arm undulation plug (15) is connected to the upper arm undulation cylinder (16). The lower arm undulation valve assembly (12) is connected to one end of the lower arm undulation plug (17), and the other end of the lower arm undulation plug (17) is connected to the lower arm undulation cylinder (18). The telescopic valve assembly (13) is connected to one end of the telescopic plug (19), and the other end of the telescopic plug (19) is connected to the telescopic cylinder (20). The rotary valve assembly (14) is connected to one end of the rotary plug (21), and the other end of the rotary plug (21) is connected to the rotary motor (22).

2. The single-ratio flow valve aerial device linkage control system of claim 1, wherein: The programmable controller (1) is provided with a controller debugging interface (10).

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