Loader auxiliary control system

Abstract

The present invention discloses a loader auxiliary linkage control system, including a switch, a PLC controller, a wiring harness and a solenoid valve; the switch includes a switch quantity button switch and an analog quantity roller switch; the switch quantity button switch and the analog quantity roller switch are both integrated in a control handle; the PLC controller controls the opening time and closing time of the solenoid valve; the solenoid valve is a hydraulic solenoid valve group to achieve the functional requirements of the auxiliary linkage; the wiring harness connects the switch, the PLC controller and the solenoid valve. This auxiliary linkage control system adopts two control modes, switch quantity and analog quantity, with precise operation, short time, safety and reliability, small impact, and can effectively avoid damage to the working components of the attachment.

Description

Technical Field

[0001] The invention relates to a control system, in particular to an auxiliary control system, and belongs to the technical field of engineering machinery. Background Art

[0002] The auxiliary link is connected to the external attachment to realize the multifunctionality of the engineering vehicle. At present, the common auxiliary link control method of engineering vehicles is: the operator turns on a switch button switch, the forward solenoid valve opens to the maximum, the auxiliary link rotates forward, the switch button switch is closed, and the auxiliary link stops; turns on another switch button switch, the reverse solenoid valve opens to the maximum, the auxiliary link reverses, the switch button switch is closed, and the auxiliary link stops. This switch hardware control method causes a large impact on the working components of the attachment, thereby significantly reducing reliability. Summary of the invention

[0003] Purpose of the invention: The present invention aims to overcome the deficiencies of existing auxiliary control systems and provide a safe and reliable control system.

[0004] Technical solution: A loader auxiliary linkage control system, including a switch, a PLC controller, a wiring harness and a solenoid valve; the solenoid valve is a hydraulic solenoid valve group to achieve the functional requirements of the auxiliary linkage; the wiring harness connects the switch, the PLC controller and the solenoid valve; the switch includes a switch quantity button switch; the PLC controller controls the opening time and closing time of the solenoid valve to reduce the negative impact such as the impact on the working components of the attachment.

[0005] Preferably, in order to achieve precise control over the attachment, the switch also includes an analog roller switch; the analog roller switch outputs an angle signal, and the PLC controller outputs a corresponding PWM signal to the solenoid valve, thereby achieving opening control over the solenoid valve and ultimately achieving precise control over the auxiliary linkage.

[0006] Preferably, in order to ensure the reliability of the control system and prevent misoperation, the switch quantity button switch and the analog quantity roller switch are in a logical OR relationship, that is, only one of the two switches can be selected to work. If the switch quantity button switch and the analog quantity roller switch are operated at the same time, only the switch quantity button switch works, that is, the switch quantity button switch has priority.

[0007] Preferably, for the convenience of operation and control, both the switch quantity button switch and the analog quantity roller switch are integrated into the operating handle.

[0008] Beneficial effects: The auxiliary linkage control system of the present invention adopts two control modes: switch quantity and analog quantity. It has precise operation, short time, safety and reliability, small impact, and can effectively avoid damage to the working components of the accessories. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is the principle diagram of the present invention;

[0010] Figure 2 It is a schematic diagram of the operation of the solenoid valve under the control of the switch quantity button;

[0011] Figure 3 This is a schematic diagram of the solenoid valve working under the control of the analog roller switch. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and preferred embodiments. The preferred embodiments are only for illustrating the present invention rather than for limiting the scope of protection of the present invention.

[0013] like Figure 1 As shown, a loader auxiliary linkage control system includes a switch 1, a PLC controller 2, a wiring harness 3 and a solenoid valve 4; the switch 1 includes a switch quantity button switch 11 and an analog quantity roller switch 12; the switch quantity button switch 11 and the analog quantity roller switch 12 are both integrated in the joystick. The joystick is installed inside the loader cab. The PLC controller 2 is fixed inside the loader frame, with a total of twelve pins, thirty-two fixed points, four input ports, two output ports, a CAN2.0B port, and a 5Vdc power supply for external sensors. The wiring harness 3 is installed inside the cab and the frame, connecting the joystick, the PLC controller 2 and the solenoid valve 4 to realize the opening control of the solenoid valve 4. The solenoid valve 4 is a hydraulic solenoid valve group to realize the functional requirements of the loader auxiliary linkage.

[0014] like Figure 1 As shown, after the loader is started, when the auxiliary link needs to be controlled by the on / off function, the switch quantity button switch 11 forward button switch is pressed, P8WH is energized, and the P11WH of the PLC controller 2 outputs a switch signal to the forward solenoid valve 4. The forward solenoid valve 4 is fully opened after a period of response time. At this time, the auxiliary link rotates forward, as shown in FIG. Figure 2 As shown. Similarly, press the reverse button switch 11 of the switch quantity button switch, P9WH is energized, and the switch signal is output to the reverse solenoid valve 4 through P12WH of the PLC controller 2. The reverse solenoid valve 4 is fully opened after a period of response time, and the auxiliary link is reversed. When the auxiliary link needs precise control, rotate the analog roller switch 12. The median voltage of the analog roller switch 12 is 2.5V. When the P5WH voltage is between 2.5V-4.5V, the PWM signal is output to the forward solenoid valve 4 through P11WH of the PLC controller 2. The forward solenoid valve 4 is in a linearly changing opening. At this time, the auxiliary link is forward, as shown. Figure 3As shown. When the voltage of P5WH is between 0.5V and 2.5V, the P12WH of the PLC controller 2 outputs a PWM signal to the reversing solenoid valve 4, and the reversing solenoid valve 4 is in a linearly changing opening, and the auxiliary link is reversed. The corresponding valve opening angle is reached according to the rotation angle of the analog roller switch 12, thereby finally realizing the precise positioning of the auxiliary link.

[0015] Although the present invention has been described in detail above in conjunction with the embodiments, those skilled in the art will appreciate that the embodiments may be modified or altered without departing from the spirit of the present invention and still fall within the protection scope of the present invention.

Claims

1. A loader auxiliary linkage control system, comprising a switch (1), a PLC controller (2), a wiring harness (3) and a solenoid valve (4); the solenoid valve (4) is a hydraulic solenoid valve group, which realizes the functional requirements of the auxiliary linkage; the wiring harness (3) connects the switch (1), the PLC controller (2) and the solenoid valve (4); the characteristics are: The switch (1) comprises a switch quantity push button switch (11); the PLC controller (2) controls the opening time and closing time of the solenoid valve (4); the switch (1) further comprises an analog quantity roller switch (12); the PLC controller (2) cooperates with the angle signal output by the analog quantity roller switch (12) to accurately control the solenoid valve (4); the switch quantity push button switch (11) and the analog quantity roller switch (12) are in a logical OR relationship, and the switch quantity push button switch (11) takes priority; the switch quantity push button switch (11) and the analog quantity roller switch (12) are both integrated into a control handle; After the loader is started, when the auxiliary linkage needs to be controlled by the on / off function, the forward rotation button switch (11) is pressed, and the switch signal is output to the solenoid valve (4) through the PLC controller (2). The solenoid valve (4) is fully opened after a period of response time. At this time, the auxiliary linkage rotates forward. Similarly, the reverse rotation button switch (11) is pressed, and the switch signal is output to the solenoid valve (4) through the PLC controller (2). The solenoid valve (4) is fully opened after a period of response time. At this time, the auxiliary linkage rotates reversely. When the auxiliary linkage needs to be precisely controlled, the analog roller switch (12) is rotated. The middle voltage of the analog roller switch (12) is 2.5V. When the voltage is between 2.5V and 4.5V, the output PWM signal of the PLC controller (2) is sent to the solenoid valve (4). The solenoid valve (4) is in a linearly changing opening. At this time, the auxiliary linkage rotates forward. When the voltage is between 0.5V and 2. 5V, the PLC controller (2) outputs a PWM signal to the solenoid valve (4), and the solenoid valve (4) is in a linearly changing opening, at which time the auxiliary link is reversed.

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