Electromagnetic chuck control system and excavator

Abstract

The utility model relates to an electromagnetic chuck, in particular to an electromagnetic chuck control system and an excavator, the control system comprises a hydraulic pump, a control main valve used for controlling other hydraulic execution parts, a hydraulic motor used for driving a generator on the electromagnetic chuck, and a motor control valve used for controlling the hydraulic motor to start and stop; the system further comprises a pressure compensation valve, an oil inlet and an oil outlet of the pressure compensation valve are correspondingly connected with the hydraulic pump and an oil inlet of the control main valve, a P opening of the pressure compensation valve is connected with the oil inlet end of the motor control valve, and the oil outlet end of the motor control valve is communicated with the oil inlet end of the hydraulic motor and an LS opening of the pressure compensation valve at the same time. According to the utility model, the pressure compensation valve is arranged at the oil inlet end of the motor control valve to ensure that the flow flowing to the hydraulic motor does not fluctuate along with the fluctuation of the load, so that the hydraulic motor for driving the generator works stably and the electromagnetic chuck works safely.

Description

Technical Field

[0001] The utility model relates to an electromagnetic sucker, and more specifically to an electromagnetic sucker control system and an excavator. Background Art

[0002] Electromagnetic chucks are driven by electricity and are usually used as attachments for other load-bearing machinery such as excavators. They are widely used in the shipbuilding industry, metal smelting industry, and heavy machinery manufacturing industry for the long-distance handling and stacking of metal materials. The carrier is usually not designed specifically for the electromagnetic chuck, so the carrier usually does not carry the electromagnetic chuck's working power supply.

[0003] In order to solve the problem of power supply when the electromagnetic suction cup is installed on a load-bearing machine that cannot be powered, a generator and a hydraulic motor that drives the generator to generate electricity are usually installed on it, and the hydraulic motor is provided with pressure oil by the load-bearing machine. In the hydraulic system of the load-bearing machine, the hydraulic pump usually supplies oil to multiple hydraulic actuators. When the electromagnetic suction cup is working and other hydraulic actuators of the load-bearing machine are actuated at the same time, the flow rate of hydraulic oil supplied to the hydraulic motor of the electromagnetic suction cup changes due to changes in external loads. The changing flow rate will cause the speed of the hydraulic motor to change and directly affect the speed of the generator. Affected by this, the adsorption and lifting capacity of the electromagnetic suction cup will also change accordingly, and there is a risk of the adsorbed material falling. In addition, when the flow rate supplied to the hydraulic motor is lower than the flow rate required for the normal operation of the hydraulic motor, the output voltage of the generator is not enough to ensure the normal operation of the electromagnetic suction cup. In this state, the electromagnetic suction cup cannot absorb materials normally, and there is a great safety risk. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the change of other hydraulic loads on the mechanical carrier will affect the rotation of the hydraulic motor on the electromagnetic sucker, and an electromagnetic sucker control system and an excavator are provided.

[0005] The utility model provides a technical solution to achieve its purpose: an electromagnetic suction cup control system, comprising a hydraulic pump, a control main valve for controlling other hydraulic actuators, a hydraulic motor for driving a generator on the electromagnetic suction cup, and a motor control valve for starting and stopping the hydraulic motor; the system also comprises a pressure compensation valve, the oil inlet and outlet of the pressure compensation valve are connected to the hydraulic pump and the oil inlet of the control main valve correspondingly, the P port of the pressure compensation valve is connected to the oil inlet end of the motor control valve, and the oil outlet end of the motor control valve is connected to the oil inlet end of the hydraulic motor and the LS port of the pressure compensation valve at the same time.

[0006] In the electromagnetic chuck control system of the utility model, the system also includes an adjustable relief valve, the oil inlet end of the adjustable relief valve is communicated with the oil outlet end of the motor control valve, and the oil outlet end of the adjustable relief valve is communicated with the hydraulic oil tank.

[0007] In the electromagnetic chuck control system of the utility model, the system also includes a throttle valve, and the oil outlet of the motor control valve is connected to the oil inlet of the hydraulic motor, the LS port of the pressure compensation valve and the oil inlet of the adjustable relief valve through the throttle valve.

[0008] In the electromagnetic sucker control system of the utility model, a safety valve is connected between the oil inlet and outlet ends of the hydraulic motor.

[0009] In the electromagnetic sucker control system of the utility model, the system also includes an electric control device, and the motor control valve is an electromagnetic valve whose electromagnetic control end is electrically connected to the electric control device.

[0010] In the electromagnetic sucker control system of the utility model, the electric control device comprises a controller electrically connected to the motor control valve and a control device electrically connected to the controller for controlling the hydraulic motor.

[0011] In the electromagnetic sucker control system of the utility model, the electric control device also includes a hydraulic pump flow parameter acquisition device and an alarm device electrically connected to the controller. The alarm device includes an alarm and a display. The hydraulic pump flow parameter acquisition device is a T-BOX.

[0012] The utility model provides a technical solution to achieve its purpose: an electromagnetic chuck control method, which is applied to the above-mentioned electromagnetic chuck control system, and the steps are as follows:

[0013] The control device sends a hydraulic motor start operation signal to the controller;

[0014] The controller obtains the flow parameters of the hydraulic pump and calculates the output flow of the hydraulic pump; when the output flow of the hydraulic pump is greater than a preset value, the controller outputs a control current to the motor control valve to make it conductive, otherwise an alarm message is issued through the alarm device.

[0015] In the electromagnetic chuck control method of the utility model, the hydraulic pump flow parameter includes the hydraulic pump displacement parameter obtained by the T-BOX electrically connected to the controller through communication and the rotation speed of the engine driving the hydraulic pump to rotate.

[0016] The utility model provides a technical solution for achieving the purpose: an excavator having the above-mentioned electromagnetic sucker control system.

[0017] Compared with the prior art, in the utility model, a pressure compensation valve is arranged at the oil inlet end of the motor control valve to ensure that the flow to the hydraulic motor does not fluctuate with the load fluctuation, so that the hydraulic motor driving the generator works stably and the electromagnetic suction cup works safely. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the electromagnetic chuck control system of the utility model.

[0019] Parts names and serial numbers in the figure:

[0020] Hydraulic oil tank 1, hydraulic pump 2, engine 3, control main valve 4, pressure compensation valve 5, motor control valve 6, throttle valve 7, adjustable overflow valve 8, hydraulic motor 9, safety valve 10, generator 11, electromagnetic suction cup 12, controller 13, operating device 14, TBOX 15, display 16, alarm 17. DETAILED DESCRIPTION

[0021] The specific implementation scheme is described below with reference to the accompanying drawings.

[0022] The electromagnetic suction cup control system of this embodiment includes a hydraulic pump 2, a control main valve 4 for controlling other hydraulic actuators, a hydraulic motor 9 for driving the generator 11 on the electromagnetic suction cup 12, and a motor control valve 6 for starting and stopping the hydraulic motor; the system also includes a pressure compensation valve 5, the inlet and outlet oil ports of the pressure compensation valve 5 are connected to the oil inlet of the hydraulic pump 2 and the control main valve 4, the P port of the pressure compensation valve 5 is connected to the oil inlet end of the motor control valve 6, and the oil outlet end of the motor control valve 6 is connected to the oil inlet end of the hydraulic motor 9 and the LS port of the pressure compensation valve 5 at the same time.

[0023] like Figure 1 As shown, the hydraulic pump 2 can be a single pump, or a double pump or a plurality of pumps. When there are multiple pumps, one of the pumps is used to supply pressure oil to other hydraulic actuators and also supplies oil to the hydraulic motor 9 driving the generator 11. Other hydraulic actuators refer to hydraulic actuators that are supplied with oil by the same pump as the hydraulic motor 9.

[0024] The oil inlet A of the pressure compensating valve 5 is connected to the P2 port of the hydraulic pump 2, the oil outlet B is connected to the oil inlet end of the control main valve 4, the P port of the pressure compensating valve 5 is connected to the oil inlet end of the motor control valve 6, and the P port of the pressure compensating valve 5 is connected to the oil inlet A of the pressure compensating valve 5.

[0025] Optionally, the electromagnetic suction cup control system includes a throttle valve 7, and the oil outlet of the motor control valve 6 is connected to the oil inlet of the hydraulic motor 9, the LS port of the pressure compensation valve 5 and the oil inlet of the adjustable relief valve 8 through the throttle valve 7.

[0026] The oil outlet end of the adjustable relief valve 8 is connected to the hydraulic oil tank 1 , and the adjustable relief valve 8 is used to adjust the working pressure of the hydraulic motor 9 .

[0027] The LS port of the pressure compensating valve 5 is connected to the spring chamber of the pressure compensating valve 5. The pressure compensating valve 5 obtains the pressure at the oil inlet end of the hydraulic motor 9 through its LS port to adjust the valve opening between its oil inlet A and oil outlet B, thereby ensuring that when the flow at its oil outlet B fluctuates, the flow from its oil inlet A to the P port remains unchanged, thereby ensuring stable operation of the hydraulic motor 9.

[0028] A safety valve 10 is connected between the oil inlet and outlet ends of the hydraulic motor 9. The safety valve 10 is used to limit the maximum pressure of the oil inlet end of the hydraulic motor 9. When the pressure at the oil inlet end of the hydraulic motor 9 reaches the opening pressure of the safety valve 10, the oil inlet end of the hydraulic motor 9 releases pressure through the safety valve 10 to avoid damage to the hydraulic motor 9.

[0029] The motor control valve 6 may be a manual mechanical valve, which is turned on or off by manually operating the valve core to switch the valve core, so that the hydraulic motor can rotate or stop rotating.

[0030] The motor control valve 6 can also be a solenoid valve, which is controlled by an electronic control device. Figure 1 As shown, the electronic control device includes a controller 13 electrically connected to the motor control valve 6 , and a control device 14 electrically connected to the controller 13 for controlling the hydraulic motor 9 .

[0031] The control device 14 can be an electric control handle or a button, switch, etc., which is used to send a hydraulic motor start operation signal or a hydraulic motor stop operation signal to the controller 13. The controller 13 outputs a control current to the motor control valve 6 to make the motor control valve 6 conductive or stops outputting the control current to the motor control valve 6 according to the operation signal.

[0032] Optionally, the electronic control device further includes a hydraulic pump flow parameter acquisition device and an alarm device electrically connected to the controller 13. The alarm device includes an alarm 17, a display 16, and the like.

[0033] The hydraulic pump flow parameter acquisition device can be a T-BOX15 that is communicatively connected to the controller 13. The T-BOX15 can acquire the electronic control information of the whole machine, including the speed of the engine 3 that drives the hydraulic pump 2 to rotate and the displacement parameter of the hydraulic pump 2. The controller 13 can calculate the output flow of the hydraulic pump 2 according to the displacement parameter and the speed of the engine 3, and then determine whether its flow can meet the working requirements of the hydraulic motor 9. When the hydraulic motor 9 is started by the control device 14, the controller 13 calculates the output flow of the hydraulic pump 2 after receiving the hydraulic motor start operation signal. When the output flow of the hydraulic pump 2 can meet the working requirements of the hydraulic motor 9, the controller 13 outputs a control current to the motor control valve 6, the motor control valve 6 is turned on, the hydraulic motor 9 rotates to drive the generator 11 to generate electricity, and the electromagnetic suction cup 12 is energized to magnetically attract the load. When the output flow of the hydraulic pump 2 cannot meet the working requirements of the hydraulic motor 9, the controller 13 does not output control current to the motor control valve 6, and the motor control valve 6 is in a cut-off state. Accordingly, the hydraulic motor 9 does not rotate, the generator 11 does not generate electricity, and the electromagnetic suction cup 12 cannot magnetically attract the load, thereby preventing the electromagnetic suction cup 12 from magnetically attracting the load in an unstable state. At the same time, an alarm message is issued through the alarm 17, or relevant information is displayed on the display 16 to alert the operator.

[0034] This embodiment provides an excavator having the aforementioned electromagnetic chuck control system.

[0035] This embodiment provides an electromagnetic chuck control method, which is applied to the aforementioned electromagnetic chuck control system, and the steps are as follows:

[0036] The control device 14 sends a hydraulic motor start operation signal to the controller 13;

[0037] The controller 13 obtains the flow parameters of the hydraulic pump and calculates the output flow of the hydraulic pump 2; when the output flow of the hydraulic pump 2 is greater than a preset value, the controller 13 outputs a control current to the motor control valve 6 to make it conductive, otherwise an alarm message is issued through the alarm 17.

[0038] Optionally, the hydraulic pump flow parameter includes a hydraulic pump displacement parameter and a speed of an engine 3 driving the hydraulic pump 2. The hydraulic pump displacement parameter and the engine speed can be obtained through a T-BOX 15 electrically connected to the controller 13. The T-BOX 15 is a device for the whole machine electronic control system, which can collect control information and parameters of the whole machine.

Claims

1. An electromagnetic chuck control system, comprising a hydraulic pump, a main control valve for controlling other hydraulic actuators, a hydraulic motor for driving a generator on the electromagnetic chuck, and a motor control valve for starting and stopping the hydraulic motor, characterized in that: It also includes a pressure compensating valve, the oil inlet and outlet of the pressure compensating valve are correspondingly connected to the hydraulic pump and the oil inlet of the control main valve, the P port of the pressure compensating valve is connected to the oil inlet end of the motor control valve, and the oil outlet end of the motor control valve is simultaneously connected to the oil inlet end of the hydraulic motor and the LS port of the pressure compensating valve.

2. The electromagnetic chuck control system according to claim 1, characterized in that: The system further comprises an adjustable relief valve, an oil inlet end of the adjustable relief valve is communicated with an oil outlet end of the motor control valve, and an oil outlet end of the adjustable relief valve is communicated with a hydraulic oil tank.

3. The electromagnetic chuck control system according to claim 2, characterized in that: The system also includes a throttle valve, and the oil outlet of the motor control valve is connected to the oil inlet of the hydraulic motor, the LS port of the pressure compensation valve and the oil inlet of the adjustable relief valve through the throttle valve.

4. The electromagnetic chuck control system according to any one of claims 1 to 3, characterized in that: A safety valve is connected between the oil inlet and outlet ends of the hydraulic motor.

5. The electromagnetic chuck control system according to any one of claims 1 to 3, characterized in that: It also includes an electric control device, and the motor control valve is an electromagnetic valve whose electromagnetic control end is electrically connected to the electric control device.

6. The electromagnetic chuck control system according to claim 5, characterized in that: The electronic control device includes a controller electrically connected to the motor control valve and a control device electrically connected to the controller for controlling the hydraulic motor.

7. The electromagnetic chuck control system according to claim 6, characterized in that: The electronic control device also includes a hydraulic pump flow parameter acquisition device and an alarm device electrically connected to the controller.

8. The electromagnetic chuck control system according to claim 7, characterized in that: The alarm device comprises an alarm and a display.

9. The electromagnetic chuck control system according to claim 7, characterized in that: The hydraulic pump flow parameter acquisition device is T-BOX.

10. An excavator, characterized in that: An electromagnetic chuck control system comprises the electromagnetic chuck control system according to any one of claims 1 to 9.

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