Control system for lifting vehicle

Abstract

A control system for a lifting vehicle comprises a direct-current power source, a storage battery, an inverter, a PLC, a remote control handle and a servo motor set. The input end of the direct-current power supply is correspondingly and electrically connected with the power grid, and the output end of the direct-current power supply is correspondingly and electrically connected with the storage battery, the PLC and the servo motor set respectively; the output end of the storage battery is correspondingly and electrically connected with the PLC and the servo motor set, and an inverter is arranged between the storage battery and the PLC. An input pin of the PLC is correspondingly and electrically connected with the remote control handle, and an output pin of the PLC is correspondingly and electrically connected with the servo motor set; the control system is low in danger level, and the position adjusting speed of the signal receiver can be increased.

Description

Technical Field

[0001] The utility model relates to the technical field of lift vehicle control, in particular to a control system for a lift vehicle. Background Art

[0002] As is known, the relative position between a certain point on the ground and the satellite is constantly changing, so the satellite signal receiver on the ground needs to adjust the orientation of its receiving end when in use to ensure that it can smoothly receive satellite signals. Generally, a lifting vehicle is used to assist in adjusting the lifting height and rotation angle of the satellite signal receiver;

[0003] Traditional lift trucks mostly use hydraulic control systems, and the control buttons are directly set on the control console of the lift truck. When in use, the worker presses the button on the control console to start the hydraulic control system to control the action mechanism of the lift truck to perform corresponding lifting or flipping actions. However, this system firstly requires the worker to stay at the control console for a long time, and the signal receiver has a certain weight. When the lift truck lifts the signal receiver and flips it to the other side of the control console, the lift truck may roll over, thereby increasing the danger of the worker's operation; secondly, the size and weight of the hydraulic equipment are large, which leads to the slow movement ability and mechanism action speed of the lift truck, and the slow position adjustment speed of the signal receiver;

[0004] Therefore, in summary, there is a need in the market for a control system that has a low risk level and can increase the speed of adjusting the position of a signal receiver. Utility Model Content

[0005] In order to overcome the deficiencies in the background technology, the utility model discloses a control system for a lifting vehicle.

[0006] In order to achieve the above-mentioned invention object, the utility model adopts the following technical solutions:

[0007] A control system for a lifting vehicle, comprising a DC power supply, a battery, an inverter, a PLC, a remote control handle and a servo motor group;

[0008] The input end of the DC power supply is electrically connected to the power grid, and the output end of the DC power supply is electrically connected to the battery, PLC and servo motor group respectively;

[0009] The output ends of the battery are electrically connected to the PLC and the servo motor group respectively, and an inverter is provided between the battery and the PLC;

[0010] The input pin of the PLC is wirelessly connected to the remote control handle, and the output pin of the PLC is electrically connected to the servo motor group.

[0011] Preferably, the DC power supply is of model HD-100-24N.

[0012] Preferably, the DC power supply comprises a power supply circuit and a control circuit, wherein the power supply circuit comprises a first rectifier and filter circuit, a common mode inductor, a switching circuit, a second rectifier and filter circuit and an electromagnetic filter circuit connected in series in sequence; the input end of the first rectifier and filter circuit is correspondingly connected to the power grid, and the output end of the electromagnetic filter circuit is correspondingly connected to the PLC and the servo motor group;

[0013] The control loop includes a detection circuit, an overvoltage protection circuit, a photoelectric coupler and a PWM control circuit; wherein the input ends of the detection circuit and the overvoltage protection circuit are connected to the power grid accordingly, the output ends of the detection circuit and the overvoltage protection circuit are connected to the PWM control circuit accordingly through a photoelectric coupler respectively, and the output end of the PWM control circuit is connected to the detection circuit accordingly.

[0014] Preferably, the DC power supply further comprises an overload protection circuit, the input end of the overload protection circuit is correspondingly connected to the switching circuit, and the output end of the overload protection circuit is correspondingly connected to the PWM control circuit.

[0015] Preferably, a contactor group is provided between the PLC and the servo motor group, and a plurality of motors in the servo motor group are connected to a plurality of contactors in the contactor group in a one-to-one correspondence.

[0016] Due to the adoption of the above-mentioned technical solution, the utility model has the following beneficial effects:

[0017] The utility model discloses a control system for a lifting vehicle. 1. A motor is used as a driving source of a lifting vehicle action mechanism, which can increase the action speed of each mechanism of the lifting vehicle, thereby increasing the position adjustment speed of a signal receiver;

[0018] 2. Use the remote control handle and PLC to realize remote control of each action mechanism of the lifting vehicle, effectively reducing the danger of workers at work. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A structural schematic diagram of the utility model;

[0020] Figure 2 Schematic diagram of the circuit structure of a DC power supply;

[0021] Figure 3 This is another structural schematic diagram of the utility model.

[0022] In the figure: 1. DC power supply; 101. First rectifier and filter circuit; 102. Common-mode inductor; 103. Switching circuit; 104. Second rectifier and filter circuit; 105. Electromagnetic filter circuit; 106. Detection circuit; 107. Overvoltage protection circuit; 108. PWM control circuit; 109. Overload protection circuit; 2. Battery; 3. Inverter; 4. PLC; 5. Remote control handle; 6. Servo motor group; 2. XX; 3. XX. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" and the like indicating directions or positional relationships, they are only corresponding to the drawings of the present invention, for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction: Example 1

[0024] Combined with Figure 1 The control system for a lifting vehicle comprises a DC power supply 1, a battery 2, an inverter 3, a PLC 4, a remote control handle 5 and a servo motor group 6;

[0025] The input end of the DC power supply 1 is electrically connected to the power grid, and the output end of the DC power supply 1 is electrically connected to the battery 2, PLC4 and servo motor group 6 respectively. When the DC power supply 1 is connected to the power grid, the DC power supply 1 will charge the battery 2 while supplying power to the PLC4 and the servo motor group 6. When the DC power supply 1 is disconnected from the power grid due to a power failure or some external factors, the battery 2 can be switched to continue to supply power to the system. It should be noted that the use of two sets of power supply solutions can improve the stability of the energy supply to the drive mechanism.

[0026] The output ends of the battery 2 are electrically connected to the PLC 4 and the servo motor group 6 respectively, and an inverter 3 is provided between the battery 2 and the PLC 4. The inverter 3 can convert the high-voltage direct current output by the battery 2 into low-voltage alternating current, thereby facilitating power supply to the PLC 4.

[0027] The input pin of the PLC4 is connected to the remote control handle 5 by radio, and the output pin of the PLC4 is connected to the servo motor group 6 by electrical connection. After receiving the control signal sent by the remote control handle 5, the PLC4 controls the corresponding motor in the servo motor group 6 to start, and the workers can perform remote operation through the radio connection, thereby improving the safety of the workers' work;

[0028] It should be noted that a control switch is provided at the output end of the DC power supply 1 and the battery 2, and the two control switches are linked, that is, when the control switch of the DC power supply 1 is disconnected, the control switch of the battery 2 is turned on, and the battery 2 supplies power to the PLC 4 and the servo motor group 6, and vice versa. Example 2

[0029] Based on Example 1, according to the attached Figure 2 The DC power supply 1 is selected to be of model HD-100-24N; wherein the DC power supply 1 comprises a power supply circuit and a control circuit, wherein the power supply circuit comprises a first rectifier and filter circuit 101, a common mode inductor 102, a switching circuit 103, a second rectifier and filter circuit 104 and an electromagnetic filter circuit 105 which are sequentially connected in series; the input end of the first rectifier and filter circuit 101 is correspondingly connected to the power grid, and the output end of the electromagnetic filter circuit 105 is correspondingly connected to the PLC 4 and the servo motor group 6. After the current of the power grid passes through the power supply circuit, it supplies power to the battery 2, the PLC 4 and the servo motor group 6, and the DC power supply 1 can output smoother and higher-quality DC power after passing through the two rectifier and filter circuits and the electromagnetic filter circuit 105;

[0030] The control circuit includes a detection circuit 106, an overvoltage protection circuit 107, a photocoupler and a PWM control circuit 108; wherein the input ends of the detection circuit 106 and the overvoltage protection circuit 107 are connected to the power grid, and the output ends of the detection circuit 106 and the overvoltage protection circuit 107 are connected to the PWM control circuit 108 through a photocoupler, respectively, and the output end of the PWM control circuit 108 is connected to the detection circuit 106. The detection circuit 106 is used to detect the power supply of the power grid. When the power supply between the power grid and the DC power supply 1 is disconnected, the detection circuit 106 will send a signal to the PWM control circuit 108, and the PWM control circuit 108 will send a control signal to the switching circuit 103 to control the switching switch action so that the battery 2 starts to supply power to the system. In addition, when the overvoltage protection voltage of the power grid is too large and may cause damage to the DC power supply 1, the PWM control circuit 108 will cut off the connection of the power supply circuit, stop the DC power supply 1 from supplying power to the system, and switch to the battery 2 to supply power to the system.

[0031] In addition, the DC power supply 1 also includes an overload protection circuit 109, the input end of the overload protection circuit 109 is correspondingly connected to the switching circuit 103, and the output end of the overload protection circuit 109 is correspondingly connected to the PWM control circuit 108. The overload protection circuit 109 can determine whether the power demand at the load end is too large. If an overload occurs, the switching circuit 103 directly cuts off the power supply of the entire system, thereby improving the safety of the system. Example 3

[0032] Based on Example 1, according to the attached Figure 3 A contactor group is provided between the PLC4 and the servo motor group 6, and the multiple motors in the servo motor group 6 are connected one-to-one with the multiple contactors in the contactor group. The PLC4 controls the electric shock action of a certain contactor in the contactor group, so that the motor corresponding to the electric shock of the contactor is powered on and works. On the one hand, the number of output pins of the PLC4 is reduced, and the complexity of wiring is reduced. On the other hand, it avoids direct burning of the PLC4 due to motor failure.

[0033] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

Claims

1. A control system for a lifting vehicle, characterized by: It includes a DC power supply (1), a battery (2), an inverter (3), a PLC (4), a remote control handle (5) and a servo motor group (6); The input end of the DC power supply (1) is electrically connected to a power grid, and the output end of the DC power supply (1) is electrically connected to a storage battery (2), a PLC (4) and a servo motor group (6) respectively; The output ends of the storage battery (2) are electrically connected to the PLC (4) and the servo motor group (6) respectively, and an inverter (3) is provided between the storage battery (2) and the PLC (4); The input pin of the PLC (4) is wirelessly connected to the remote control handle (5), and the output pin of the PLC (4) is electrically connected to the servo motor group (6).

2. The control system for a lift vehicle as claimed in claim 1, characterized in that: The DC power supply (1) is of model HD-100-24N.

3. The control system for a lift vehicle as claimed in claim 2, characterized in that: The DC power supply (1) comprises a power supply circuit and a control circuit, wherein the power supply circuit comprises a first rectifier and filter circuit (101), a common mode inductor (102), a switching circuit (103), a second rectifier and filter circuit (104), and an electromagnetic filter circuit (105) which are sequentially connected in series; the input end of the first rectifier and filter circuit (101) is connected to a power grid, and the output end of the electromagnetic filter circuit (105) is connected to a PLC (4) and a servo motor group (6); The control loop comprises a detection circuit (106), an overvoltage protection circuit (107), a photoelectric coupler and a PWM control circuit (108); wherein the input ends of the detection circuit (106) and the overvoltage protection circuit (107) are both connected to a power grid, the output ends of the detection circuit (106) and the overvoltage protection circuit (107) are connected to the PWM control circuit (108) via a photoelectric coupler, and the output end of the PWM control circuit (108) is connected to the detection circuit (106).

4. The control system for a lift vehicle as claimed in claim 3, characterized in that: The DC power supply (1) further comprises an overload protection circuit (109), wherein an input end of the overload protection circuit (109) is correspondingly connected to the switching circuit (103), and an output end of the overload protection circuit (109) is correspondingly connected to the PWM control circuit (108).

5. The control system for a lift vehicle as claimed in claim 1, characterized in that: A contactor group is provided between the PLC (4) and the servo motor group (6), and a plurality of motors in the servo motor group (6) are connected to a plurality of contactors in the contactor group in a one-to-one correspondence.

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