A closed-type winch tension control system and method, and a continuous wall hydraulic grab

Abstract

A closed-loop winch tension control system, method and continuous wall hydraulic grab, comprising a closed-loop pump and a motor connected to each other. The input end of a controller is connected with a pressure sensor, an engine control unit and a display, and the output end of the controller is connected with the coils of a first control valve and a second control valve. According to the state of wire rope relaxation caused by different strata or different bucket weights, the winch tension force parameter in the display is adjusted. The controller reads the real-time rotational speed information of the engine control unit, and the controller matches the corresponding target displacement of the motor and the displacement of the pump to achieve winch tension. This application solves the problem of groove deviation caused by wire rope relaxation when the grab touches the bottom and the grab closes under different strata through winch tension control. At the same time, the adopted closed-loop system avoids energy loss and can quickly adjust the tension, so as to improve the vertical quality of the groove and the service life of the wire rope.

Description

Technical Field

[0001] The present invention relates to the technical field of construction machinery, and specifically to a closed winch tension control system and method and a diaphragm wall hydraulic grab. Background Art

[0002] In order to achieve efficient construction, engineering construction machinery such as diaphragm wall hydraulic grabs and rotary drilling rigs have increased the speed of winch lifting and lowering. In order to achieve energy conservation, a closed system is adopted in the hydraulic system. The closed system can reduce pressure loss and improve the smoothness during commutation.

[0003] When the grab body of the diaphragm wall hydraulic grab touches the bottom at high speed with the winch, due to inertia, parking brake delay and other reasons, the wire rope becomes overly loose and slack. In addition, when the grab body grabs soil, the winch will also become slack due to the reaction force of the soil layer. As a result, the grab body will tilt during construction, leading to a decline in the quality of the trench forming. At present, most of the winch slack is achieved by the operator manually operating the winch lifting action based on experience, or by using an overflow valve and a directional valve to achieve automatic tensioning. However, the linearity and micro-movement of the valve group are insufficient, and the use effects are not ideal. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a closed winch tension control system and method and a diaphragm wall hydraulic grab with a simple structure and good effects.

[0005] The present invention is implemented as follows: A closed winch tension control system includes a closed pump and a motor connected to each other. A pressure sensor is provided on the pipeline connecting the closed pump and the motor. The closed pump is connected to a first control valve, and the motor is connected to a second control valve. The system also includes a controller. The input end of the controller is connected to a pressure sensor, an engine speed sensor, and a display. The output end of the controller is connected to the first control valve and the second control valve.

[0006] Furthermore: The closed pump is a bidirectional variable pump, and the motor is a bidirectional variable motor.

[0007] The closed pump and the motor form a closed system, and the oil inlet and outlet of the closed pump are respectively connected to the oil inlet and outlet of the motor through pipelines.

[0008] The first control valve is a double-coil electro-hydraulic proportional valve, and the first control valve includes a first control valve coil Ⅰ and a first control valve coil Ⅱ.

[0009] The second control valve is a single-coil electro-hydraulic proportional solenoid valve, and the second control valve includes a second control valve coil.

[0010] The display is provided with a winch tension force parameter setting button.

[0011] A method for a closed-loop winch tension control system includes the following steps:

[0012] S1. Set the winch tension force parameter on the display.

[0013] S2. The controller reads the real-time speed information of the engine measured by the engine speed sensor and the winch tension force parameter set on the display, calculates and stores the matching target tension pressure information.

[0014] S3. The controller matches the target displacement of the corresponding motor according to the stored target tension pressure information.

[0015] S4. The controller compares the target tension pressure information with the real-time tension pressure measured by the pressure sensor. To make the two tend to be equal, it adjusts the displacement of the tension-direction closed-loop pump.

[0016] In step S3, the controller adjusts the current value of the second control valve according to the curve relationship between the current of the second control valve and the motor displacement to achieve the required motor displacement.

[0017] In step S4, the controller adjusts the current value of the first control valve in real time according to the curve relationship between the current of the first control valve and the displacement of the closed-loop pump. The first control valve controls the displacement of the tension-direction closed-loop pump.

[0018] The diaphragm wall hydraulic grab includes a closed-loop winch tension control system and also includes a closed-loop winch tension control method.

[0019] The present invention has the following advantages: The closed-loop winch tension control system and method of the present invention and the diaphragm wall hydraulic grab solve the problem of groove deviation caused by the grab touching the bottom and the wire rope becoming slack when the grab closes under different strata through winch tension control. At the same time, the adopted closed-loop system avoids energy loss and can quickly adjust the tension, so as to improve the vertical quality of the groove and the service life of the wire rope. Description of the Drawings

[0020] Figure 1 is the control flow chart of the present invention;

[0021] Figure 2 is the hydraulic principle schematic diagram of the present invention;

[0022] Figure 3 is the electrical working principle schematic diagram of the present invention;

[0023] Figure 4 is the curve relationship diagram of the control valve coil current and displacement of the present invention;

[0024] In the figure: 1. Pressure sensor, 2. Closed-loop pump, 3. Motor, 4. First control valve, 41. First control valve coil Ⅰ, 42. First control valve coil Ⅱ, 5. Second control valve,

[0025] 51. Second control valve coil, 6. Engine control unit, 7. Display, 8. Controller. Detailed implementation mode

[0026] The preferred embodiments of the present invention patent will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention patent and are not used to limit the present invention patent.

[0027] As Figures 2 to 3 shown, a closed winch tensioning control system includes a closed pump 2 and a motor 3 connected to each other. A pressure sensor 1 is provided on the pipeline connecting the closed pump 2 and the motor 3. The closed pump 2 is connected to a first control valve 4, and the motor 3 is connected to a second control valve 5. The system further includes a controller 8. The input end of the controller 8 is connected to the pressure sensor 1, the engine speed sensor 6 and the display 7, and the output end of the controller 8 is connected to the first control valve 4 and the second control valve 5. The display 7 is provided with a winch tensioning force parameter setting button. The closed winch tensioning control system of the present invention includes a closed pump and a motor connected end to end to form a closed system. The adopted closed system avoids energy loss, can quickly adjust the tension, and improve the construction efficiency; a pressure sensor is provided on the pipeline of the closed system to detect the real-time tension pressure; the closed pump is connected to a control valve for controlling the rotation direction and displacement of the pump, and the on-off and the magnitude of the energized current of this valve are controlled by the controller; the motor is connected to a control valve for controlling the displacement, and this valve is also controlled by the controller; the display is used to set the winch tensioning force parameter and transmit it to the controller, and can also be set by other means such as a knob, and according to the state of the wire rope relaxation caused by different strata or different bucket weights, adjust the winch tensioning force parameter in the display; the setting of the engine speed sensor can transmit the engine speed information to the controller in real time; during use, the controller controls the tension pressure to be constant according to the set tension force parameter and the real-time engine speed information, and adjusts the displacement of the closed pump and the displacement of the motor to solve the problem of the groove deviation caused by the wire rope relaxation when the grab body touches the bottom and grabs soil in different strata, so as to improve the vertical quality of the groove and the service life of the wire rope; at the same time, the adopted closed system avoids energy loss, can quickly adjust the tension, and improve the construction efficiency.

[0028] As Figures 2 to 3 shown, in a closed winch tensioning control system, the closed pump 2 is a bidirectional variable pump, and the motor 3 is a bidirectional variable motor. The closed pump 2 and the motor 3 form a closed system, and the oil inlet and outlet of the closed pump 2 and the oil inlet and outlet of the motor 3 are respectively connected by pipelines. In the present invention, the oil inlet and outlet of the closed pump and the oil inlet and outlet of the motor are respectively connected by pipelines. Ignoring the pipeline pressure loss, the pressures of the closed pump and the motor are equal; the pressure sensor is installed in the tensioning oil circuit connecting the closed pump and the motor to detect the real-time tension pressure.

[0029] As Figures 2 to 3 shown, a closed winch tensioning control system, wherein the first control valve 4 is a dual-coil electro-hydraulic proportional valve, and the first control valve 4 includes a first control valve coil I 41 and a first control valve coil II 42. The second control valve 5 is a single-coil electro-hydraulic proportional solenoid valve. The first control valve of the present invention is a dual-coil electro-hydraulic proportional valve for adjusting the displacement and rotation direction of the closed pump 2; it includes a first control valve coil I and a first control valve coil II. When the first control valve coil I or the first control valve coil II is energized, the control oil is introduced into and discharged from the stroke piston to control the forward or reverse rotation of the closed pump. The magnitude of the energizing current can adjust the displacement magnitude; the second control valve is a single-coil electro-hydraulic proportional solenoid valve for adjusting the displacement of the motor.

[0030] As Figure 1 and Figure 4 shown, a method for a closed winch tensioning control system includes the following steps:

[0031] S1. Set the winch tensioning force parameter on the display 7; and the winch tensioning force parameter in the display can be adjusted according to the state of wire rope relaxation caused by different strata or different bucket weights.

[0032] S2. The controller 8 reads the real-time engine speed information measured by the engine speed sensor 6 and the winch tensioning force parameter set on the display 7, calculates and stores the matching target tensioning pressure information.

[0033] S3. The controller 8 matches the target displacement of the corresponding motor according to the stored target tensioning pressure information.

[0034] The controller 8 adjusts the current value of the second control valve 5 according to the curve relationship between the current of the second control valve 5 and the displacement of the motor 3 to achieve the required motor displacement.

[0035] S4. The controller 8 compares the target tensioning pressure information with the real-time tensioning pressure measured by the pressure sensor 1. When the two tend to be equal, the displacement of the tensioning direction closed pump 2 is adjusted.

[0036] The controller 8 adjusts the current value of the first control valve 4 in real time according to the curve relationship between the current of the first control valve 4 and the displacement of the closed pump 2. The first control valve 4 controls the displacement of the tensioning direction closed pump 2. Assume that the first control valve coil I 41 is for the winch lifting direction, that is, the tensioning direction. Adjust the current value of the first control valve coil 41 to achieve the required displacement of the tensioning direction closed pump 2.

[0037] The diaphragm wall hydraulic grab includes the above-mentioned closed winch tensioning control system and the closed winch tensioning control method.

[0038] The diaphragm wall hydraulic grab includes a closed winch tension control system and also includes a closed winch tension control method. For a closed winch tension control system and method of the present invention and a diaphragm wall hydraulic grab, the problem of groove deviation caused by the slack of the wire rope when the grab touches the bottom and the grab closes under different strata is solved through winch tension control. At the same time, the adopted closed system avoids energy loss and can quickly adjust the tension, so as to improve the vertical quality of the groove and the service life of the wire rope, and enhance the construction efficiency.

[0039] Finally, it should be noted that the above are only preferred examples of the present invention for patents, and are not used to limit the present invention for patents. Although the present invention for patents has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention for patents shall be included within the protection scope of the present invention for patents.

Claims

1. A method for using a closed-loop hoist tension control system, characterized in that: It includes a closed-loop pump (2) and a motor (3) connected to each other, a pressure sensor (1) is provided on the pipeline connecting the closed-loop pump (2) and the motor (3), the closed-loop pump (2) is connected to a first control valve (4), the motor (3) is connected to a second control valve (5), it further includes a controller (8), the input end of the controller (8) is electrically connected to a pressure sensor (1), an engine control unit (6) and a display (7), the output end of the controller (8) is electrically connected to the first control valve (4) and the second control valve (5); the display (7) is provided with a hoist tension force parameter setting; It includes the following steps: S1. Set the hoist tension force parameter on the display (7); S2. The controller (8) reads the real-time speed information of the engine control unit (6) and the hoist tension force parameter set by the display (7), calculates and stores the matching target tension pressure information; S3. The controller (8) matches the target displacement of the motor according to the stored target tension pressure information; S4. The controller (8) compares the target tension pressure information with the real-time tension pressure measured by the pressure sensor (1). To make the two tend to be equal, adjust the displacement of the tension-direction closed-loop pump (2); In step S3, the controller (8) adjusts the current value of the second control valve (5) according to the curve relationship between the current of the second control valve (5) and the displacement of the motor (3) to achieve the required motor displacement; In step S4, the controller (8) adjusts the current value of the first control valve (4) according to the curve relationship between the current of the first control valve (4) and the displacement of the closed-loop pump (2), and the first control valve (4) controls the displacement of the tension-direction closed-loop pump (2).

2. A method for using a closed-loop hoist tension control system according to claim 1, characterized in that: the closed-loop pump (2) is a bidirectional variable pump, and the motor (3) is a bidirectional variable motor.

3. A method for using a closed-loop hoist tension control system according to claim 1, characterized in that: the closed-loop pump (2) and the motor (3) form a closed-loop system, and the oil inlet and outlet of the closed-loop pump (2) are respectively connected to the oil inlet and outlet of the motor (3) through pipelines.

4. A method for using a closed-loop hoist tension control system according to claim 1, characterized in that: the first control valve (4) is a double-coil electro-hydraulic proportional valve, and the first control valve (4) includes a first control valve coil I (41) and a first control valve coil II (42).

5. A method for using a closed-loop hoist tension control system according to claim 1, characterized in that: the second control valve (5) is a single-coil electro-hydraulic proportional valve, and the second control valve (5) includes a second control valve coil (51).

6. A continuous wall hydraulic grab, characterized in that: It is used to execute the method for using a closed-loop hoist tension control system according to any one of claims 1-5.

Images