Control system and method for sliding oil cylinder of backhoe loader

Abstract

The invention provides a backhoe loader sliding oil cylinder control system and method, and belongs to the technical field of backhoe loaders, the backhoe loader sliding oil cylinder control system comprises a main pump and a gear pump set, the main pump and the gear pump set are both connected with a hydraulic oil tank, and an oil outlet of the main pump is connected with an oil inlet of a multi-way reversing valve; an oil outlet of the multi-way reversing valve is connected with the telescopic oil cylinder and the sliding oil cylinder through the sliding electromagnetic valve. An oil outlet of the gear pump set is connected with an oil inlet of the two-linkage pilot valve and an oil inlet of the electric proportional control valve, and oil outlets of the two-linkage pilot valve and the electric proportional control valve are connected with the pilot end of the multi-way reversing valve through the first shuttle valve and the second shuttle valve. Switching and action of the sliding oil cylinder can be controlled at the same time, the operation process is simplified, and the situation that the construction progress is affected by misoperation is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of backhoe loaders, and in particular relates to a backhoe loader sliding cylinder control system and method. Background Art

[0002] An excavator loader is a multifunctional engineering machinery that includes both a loading end working device and an excavation end working device. The excavation end boom can move left and right and telescopically to increase the working range of the excavation end. Existing excavators use a sliding cylinder set on the sliding mechanism to achieve left and right movement of the excavation end boom, and a telescopic cylinder set on the boom to achieve extension or shortening of the excavation end boom.

[0003] Since the sliding cylinder and the telescopic cylinder do not work at the same time, the existing sliding cylinder and the telescopic cylinder are controlled by the same reversing valve, and a solenoid valve is set between the reversing valve and the sliding cylinder and the telescopic cylinder to switch the sliding cylinder and the telescopic cylinder.

[0004] When the excavator arm needs to move left and right, two buttons need to be controlled to realize the switching and movement of the sliding cylinder. The operation is relatively cumbersome and operational errors often occur, which seriously affects the construction progress. Summary of the Invention

[0005] In response to the defects or shortcomings in the existing technology, the present invention provides a sliding cylinder control system and method for an excavator loader, which can simultaneously control the switching and movement of the sliding cylinder, simplify the operation process, and avoid operational errors that affect the construction progress.

[0006] To achieve the above object, the present invention adopts the following technical solutions: In a first aspect, an embodiment of the present invention provides a sliding cylinder control system for an excavator loader, comprising a main pump and a gear pump assembly, both of which are connected to a hydraulic oil tank, wherein the oil outlet of the main pump is connected to the oil inlet of a multi-way reversing valve, and the oil outlet of the multi-way reversing valve is connected to the telescopic cylinder and the sliding cylinder respectively through a sliding solenoid valve; The oil outlet of the gear pump group is connected to the oil inlet of the two-way pilot valve and the oil inlet of the electric proportional control valve respectively. The oil outlets of the two-way pilot valve and the electric proportional control valve are connected to the pilot end of the multi-way reversing valve through the first shuttle valve and the second shuttle valve; Y1 and Y2 on the electric proportional control valve are both connected in series with Y3 of the sliding solenoid valve.

[0007] Furthermore, the port 6A of the multi-way reversing valve is connected to the port A of the sliding solenoid valve, and the port 6B of the multi-way reversing valve is connected to the port B of the sliding solenoid valve.

[0008] Furthermore, the C port of the sliding solenoid valve is connected to the rodless chamber of the telescopic oil cylinder, and the D port of the sliding solenoid valve is connected to the rod chamber of the telescopic oil cylinder.

[0009] Furthermore, the E port of the sliding solenoid valve is connected to the rod cavity at the bottom of the sliding oil cylinder, and the F port of the sliding solenoid valve is connected to the rod cavity at the top of the sliding oil cylinder.

[0010] Furthermore, port 1 of the two-way pilot valve is connected to port A2 of the second shuttle valve, and port 2 of the two-way pilot valve is connected to port A2 of the first shuttle valve.

[0011] Furthermore, the A1 port of the electric proportional control valve is connected to the A1 port of the first shuttle valve, and the A2 port of the electric proportional control valve is connected to the A1 port of the second shuttle valve.

[0012] Furthermore, the oil outlet of the first shuttle valve is connected to the P6b port of the multi-way reversing valve, and the oil outlet of the second shuttle valve is connected to the P6a port of the multi-way reversing valve.

[0013] Furthermore, the two-way pilot valve is connected to the telescopic button, and the electric proportional control valve is electrically connected to the sliding button.

[0014] Furthermore, the telescopic button and the sliding button are both arranged in the cab of the backhoe loader.

[0015] In a second aspect, an embodiment of the present invention provides a method for controlling a sliding cylinder of an excavator loader, using the sliding cylinder control system of the excavator loader as described above, comprising the following steps: When the excavator arm needs to move, first press the slide button to energize the control electric proportional control valve coil and the slide solenoid valve coil. At this time, the control of the telescopic cylinder is switched to the control of the slide cylinder. When the telescopic rod of the sliding cylinder needs to be extended downward, Y2 of the electric proportional control valve and Y3 of the sliding solenoid valve are energized, and the hydraulic oil flows out from the A2 port of the electric proportional control valve and enters the P6a port of the multi-way reversing valve through the second shuttle valve. At this time, the spool of the multi-way reversing valve moves downward, and the oil inlet of the multi-way reversing valve is connected to the 6A port. The hydraulic oil enters the rod chamber at the upper part of the sliding cylinder through the sliding solenoid valve, and the piston rod moves downward; When the telescopic rod of the sliding cylinder needs to be extended upward, Y1 of the electric proportional control valve and Y3 of the sliding solenoid valve are energized, and the hydraulic oil flows out from the A1 port of the electric proportional control valve and enters the P6b port of the multi-way directional valve through the first shuttle valve. At this time, the spool of the multi-way directional valve moves upward, and the oil inlet of the multi-way directional valve is connected to the 6B port. The hydraulic oil enters the rod chamber at the bottom of the sliding cylinder through the sliding solenoid valve, and the piston rod moves downward.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides an electric proportional control valve, a first shuttle valve and a second shuttle valve. The two-way pilot valve and the electric proportional control valve are connected to the pilot end of the multi-way reversing valve through the first shuttle valve and the second shuttle valve. Y1 and Y2 on the electric proportional control valve are connected in series with Y3 of the sliding solenoid valve. The sliding button is used to simultaneously control the switching and movement of the sliding cylinder, simplifying the operation process and avoiding operational errors that affect the construction progress. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of the sliding cylinder control system of the present invention; Among them, 1. Hydraulic oil tank; 2. Main pump; 3. Gear pump group; 4. Two-way pilot valve; 5. Electric proportional control valve; 6. Multi-way reversing valve; 7. First shuttle valve; 8. Second shuttle valve; 9. Telescopic cylinder; 10. Sliding cylinder; 11. Sliding solenoid valve.

[0018] Specific real-time method The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Example 1 A typical embodiment of the present invention is as follows Figure 1 As shown, a sliding cylinder control system for an excavator loader includes a main pump 2 and a gear pump group 3. The main pump 2 and the gear pump group 3 are both connected to a hydraulic oil tank 1, wherein the oil outlet of the main pump 2 is connected to the oil inlet of a multi-way reversing valve 6, and the oil outlet of the multi-way reversing valve 6 is connected to the telescopic cylinder 9 and the sliding cylinder 10 respectively through a sliding solenoid valve 11.

[0020] In this embodiment, the sliding solenoid valve 11 is a two-position six-way solenoid switch valve, which is a common product on the market.

[0021] Specifically, the 6A port of the multi-way reversing valve 6 is connected to the A port of the sliding solenoid valve 11, the 6B port of the multi-way reversing valve 6 is connected to the B port of the sliding solenoid valve 11, the C port of the sliding solenoid valve 11 is connected to the rod chamber at the upper part of the sliding cylinder 10, the D port of the sliding solenoid valve 11 is connected to the rod chamber at the lower part of the sliding cylinder 10, the E port of the sliding solenoid valve 11 is connected to the rodless chamber of the telescopic cylinder 9, and the F port of the sliding solenoid valve 11 is connected to the rod chamber of the telescopic cylinder 9.

[0022] When in use, the main pump 2 is used to extract hydraulic oil from the hydraulic oil tank 1 and transport it to the multi-way reversing valve 6. The multi-way reversing valve 6 transports the hydraulic oil to the sliding solenoid valve 11, and then transports it to the telescopic cylinder 9 and the sliding cylinder 10 respectively through the sliding solenoid valve 11.

[0023] The oil outlet of the gear pump group 3 is connected to the oil inlet of the two-way pilot valve 4 and the oil inlet of the electric proportional control valve 5 respectively. The oil outlets of the two-way pilot valve 4 and the electric proportional control valve 5 are connected to the pilot end of the multi-way reversing valve 6 through the first shuttle valve 7 and the second shuttle valve 8.

[0024] Specifically, port 1 of the two-way pilot valve 4 is connected to port A2 of the second shuttle valve 8, port 2 of the two-way pilot valve 4 is connected to port A2 of the first shuttle valve 7, port A1 of the electric proportional control valve 5 is connected to port A1 of the first shuttle valve 7, port A2 of the electric proportional control valve 5 is connected to port A1 of the second shuttle valve 8, the oil outlet of the first shuttle valve 7 is connected to port P6b of the multi-way directional valve 6, and the oil outlet of the second shuttle valve 8 is connected to port P6a of the multi-way directional valve 6, thereby controlling the multi-way directional valve 6 to perform switching output.

[0025] A telescopic button and a sliding button are provided in the cab of the excavator loader. The telescopic button is connected to the two-way pilot valve 4, so that the telescopic button is used to control the oil inlet of the two-way pilot valve 4 to be connected to port 1 or port 2, thereby controlling the telescopic movement of the excavator loader's boom. The electric proportional control valve 5 is electrically connected to the sliding button, so that the sliding button is used to control Y1 or Y2 of the electric proportional control valve 5 to be energized, thereby controlling the left and right swing of the excavator loader's boom. Y1 and Y2 on the electric proportional control valve 5 are both connected in series with Y3 of the sliding solenoid valve 11. When any one of Y1 and Y2 of the electric proportional control valve 5 is energized, Y3 of the sliding solenoid valve 11 is energized, thereby controlling the switching and movement of the sliding cylinder through the sliding button, reducing the operator's operating steps and avoiding errors during operation.

[0026] Example 2 This embodiment provides a method for controlling a sliding cylinder of a backhoe loader, using a backhoe loader sliding cylinder control system as described in the first embodiment, including the following steps: When the telescopic oil cylinder needs to be controlled to move, the sliding solenoid valve does not move, and the extension or retraction of the telescopic oil cylinder piston rod is controlled by controlling the two-way pilot valve.

[0027] Specifically, when it is necessary to control the extension of the telescopic cylinder piston rod, the telescopic button is used to control the oil inlet of the two-way pilot valve to be connected to port 1, and the hydraulic oil flows out from port 1 of the two-way pilot valve and enters the P6a port of the multi-way reversing valve through the second shuttle valve. At this time, the spool of the multi-way reversing valve moves downward, and the oil inlet of the multi-way reversing valve is connected to port 6A. The hydraulic oil enters the rodless chamber of the telescopic cylinder through the sliding solenoid valve, thereby extending the piston rod of the telescopic cylinder.

[0028] When it is necessary to control the retraction of the telescopic cylinder piston rod, the oil inlet of the two-way pilot valve is connected to port 2 through the button control, and the hydraulic oil flows out from port 2 of the pilot valve and enters the P6b port of the multi-way reversing valve through the first shuttle valve. At this time, the spool of the multi-way reversing valve moves upward, and the oil inlet of the multi-way reversing valve is connected to port 6B. The hydraulic oil will slide the solenoid valve into the rod chamber of the telescopic cylinder, thereby extending the piston rod of the telescopic cylinder.

[0029] When it is necessary to control the movement of the sliding cylinder, there is no need to press the telescopic control button. The sliding control button is used to control the Y1 end or Y2 end of the electric proportional control valve to be energized. Since the Y3 end of the sliding solenoid valve is connected in series with the Y1 end and Y2 end of the electric proportional control valve, no matter whether the Y1 end or the Y2 end of the electric proportional control valve is energized, the Y3 end of the sliding solenoid valve is energized, thereby realizing automatic switching between the telescopic cylinder and the sliding cylinder.

[0030] When the telescopic rod of the sliding cylinder needs to be extended downward, the sliding button controls Y2 of the electric proportional control valve and Y3 of the sliding solenoid valve to be energized, and the hydraulic oil flows out from the A2 port of the electric proportional control valve and enters the P6a port of the multi-way directional valve through the second shuttle valve. At this time, the spool of the multi-way directional valve moves downward, and the oil inlet of the multi-way directional valve is connected to the 6A port. The hydraulic oil enters the rod chamber at the upper part of the sliding cylinder through the sliding solenoid valve, and the piston rod moves downward.

[0031] When the telescopic rod of the sliding cylinder needs to be extended upward, the sliding button controls Y1 of the electric proportional control valve and Y3 of the sliding solenoid valve to be energized, and the hydraulic oil flows out from the A1 port of the electric proportional control valve and enters the P6b port of the multi-way directional valve through the first shuttle valve. At this time, the spool of the multi-way directional valve moves upward, and the oil inlet of the multi-way directional valve is connected to the 6B port. The hydraulic oil enters the rod chamber at the lower part of the sliding cylinder through the sliding solenoid valve, and the piston rod moves downward.

[0032] The present invention provides an electric proportional control valve, a first shuttle valve and a second shuttle valve. The two-way pilot valve and the electric proportional control valve are connected to the pilot end of the multi-way reversing valve through the first shuttle valve and the second shuttle valve. Y1 and Y2 on the electric proportional control valve are connected in series with Y3 of the sliding solenoid valve. The sliding button is used to simultaneously control the switching and movement of the sliding cylinder, simplifying the operation process and avoiding operational errors that affect the construction progress.

[0033] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A sliding cylinder control system for an excavator loader, characterized in that: It includes a main pump and a gear pump group, both of which are connected to the hydraulic oil tank. The oil outlet of the main pump is connected to the oil inlet of the multi-way reversing valve, and the oil outlet of the multi-way reversing valve is connected to the telescopic cylinder and the sliding cylinder respectively through the sliding solenoid valve; The oil outlet of the gear pump group is connected to the oil inlet of the two-way pilot valve and the oil inlet of the electric proportional control valve respectively. The oil outlets of the two-way pilot valve and the electric proportional control valve are connected to the pilot end of the multi-way reversing valve through the first shuttle valve and the second shuttle valve; Y1 and Y2 on the electric proportional control valve are both connected in series with Y3 of the sliding solenoid valve.

2. The backhoe loader sliding cylinder control system according to claim 1, characterized in that: The 6A port of the multi-way reversing valve is connected to the A port of the sliding solenoid valve, and the 6B port of the multi-way reversing valve is connected to the B port of the sliding solenoid valve.

3. The backhoe loader sliding cylinder control system according to claim 2, characterized in that: The C port of the sliding solenoid valve is connected to the rod chamber at the upper part of the sliding oil cylinder, and the D port of the sliding solenoid valve is connected to the rod chamber at the lower part of the sliding oil cylinder.

4. The backhoe loader sliding cylinder control system according to claim 2, characterized in that: The E port of the sliding solenoid valve is connected to the rodless cavity of the telescopic oil cylinder, and the F port of the sliding solenoid valve is connected to the rod cavity of the telescopic oil cylinder.

5. The backhoe loader sliding cylinder control system according to claim 1, characterized in that: The port 1 of the two-way pilot valve is connected to the port A2 of the second shuttle valve, and the port 2 of the two-way pilot valve is connected to the port A2 of the first shuttle valve.

6. The backhoe loader sliding cylinder control system according to claim 5, characterized in that: The A1 port of the electric proportional control valve is connected to the A1 port of the first shuttle valve, and the A2 port of the electric proportional control valve is connected to the A1 port of the second shuttle valve.

7. The backhoe loader sliding cylinder control system according to claim 6, characterized in that: The oil outlet of the first shuttle valve is connected to the P6b port of the multi-way reversing valve, and the oil outlet of the second shuttle valve is connected to the P6a port of the multi-way reversing valve.

8. The backhoe loader sliding cylinder control system according to claim 1, characterized in that: The two-way pilot valve is connected to the telescopic button, and the electric proportional control valve is electrically connected to the sliding button.

9. The backhoe loader sliding cylinder control system according to claim 8, characterized in that: The telescopic button and the sliding button are both arranged in the cab of the backhoe loader.

10. A backhoe loader sliding cylinder control method, using a backhoe loader sliding cylinder control system according to any one of claims 1 to 9, characterized in that: The following steps are involved: When the excavator arm needs to move, first press the slide button to energize the control electric proportional control valve coil and the slide solenoid valve coil. At this time, the control of the telescopic cylinder is switched to the control of the slide cylinder. When the telescopic rod of the sliding cylinder needs to be extended downward, Y2 of the electric proportional control valve and Y3 of the sliding solenoid valve are energized, and the hydraulic oil flows out from the A2 port of the electric proportional control valve and enters the P6a port of the multi-way reversing valve through the second shuttle valve. At this time, the spool of the multi-way reversing valve moves downward, and the oil inlet of the multi-way reversing valve is connected to the 6A port. The hydraulic oil enters the rod chamber at the upper part of the sliding cylinder through the sliding solenoid valve, and the piston rod moves downward; When the telescopic rod of the sliding cylinder needs to be extended upward, Y1 of the electric proportional control valve and Y3 of the sliding solenoid valve are energized, and the hydraulic oil flows out from the A1 port of the electric proportional control valve and enters the P6b port of the multi-way directional valve through the first shuttle valve. At this time, the spool of the multi-way directional valve moves upward, and the oil inlet of the multi-way directional valve is connected to the 6B port. The hydraulic oil enters the rod chamber at the bottom of the sliding cylinder through the sliding solenoid valve, and the piston rod moves downward.

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