Control loop, knocking device, knocking device control system and control method thereof

Abstract

A control circuit, a knocking device, a knocking device control system and a control method thereof, wherein the control circuit comprises: an oil tank, an oil pump, an oil pipeline, a first control pipeline, a second control pipeline, a hydraulic cylinder, a third control pipeline, a fourth control pipeline and a hydraulic motor; the first control pipeline and the second control pipeline are connected to the oil pipeline through a first reversing valve mechanism, when the first reversing valve mechanism is connected to the oil pipeline and the first control pipeline, the hydraulic cylinder rises; when the first reversing valve mechanism is connected to the oil pipeline and the second control pipeline, the hydraulic cylinder descends; the third control pipeline and the fourth control pipeline are connected to the oil pipeline through a second reversing valve mechanism, when the second reversing valve mechanism is connected to the oil pipeline and the third control pipeline, the hydraulic motor rotates forward; when the second reversing valve mechanism is connected to the oil pipeline and the fourth control pipeline, the hydraulic motor rotates reversely. The control circuit helps to simplify the control operation of the hydraulic cylinder and the hydraulic motor, and is conducive to realizing automatic control.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel detection, and in particular to a control loop, a knocking device, a knocking device control system and a control method thereof. Background Art

[0002] In the domestic infrastructure construction, the number of tunnels is increasing. During the construction acceptance of the tunnel and the regular inspection of the tunnel in the later use stage, it is necessary to check in detail whether there is a cavity between the tunnel wall and the soil and rock layer outside the tunnel wall. Because of the obstruction of the tunnel wall, the inspectors can only judge by the sound produced by knocking.

[0003] Inspectors usually hold a telescopic rod with a hammer on the top to knock. Manual knocking is not only labor-intensive, inefficient, and time-consuming, but also difficult to ensure that the knocking force is the same, which can easily lead to inspection errors.

[0004] Currently, some knocking devices have appeared to replace manual labor with machinery. However, the control operation steps of existing knocking devices are complicated, the operation is difficult, and the manual workload is still large. Summary of the invention

[0005] The problem solved by the present invention is to provide a control loop, a knocking device, a knocking device control system and a control method thereof, which are helpful to simplify the control operation of the hydraulic cylinder and the hydraulic motor and facilitate the realization of automatic control.

[0006] In order to solve the above problems, the present invention provides a control circuit, comprising: an oil tank, an oil pump for outputting the oil in the oil tank, an oil delivery pipeline connected to the oil pump, a first control pipeline, a second control pipeline, a hydraulic cylinder for driving the lifting platform to rise and fall, a third control pipeline, a fourth control pipeline and a hydraulic motor for rotating and driving the cam to rotate forward and reverse; the first control pipeline and the second control pipeline are connected to the oil delivery pipeline through a first reversing valve mechanism, the first control pipeline is connected to the rodless chamber of the hydraulic cylinder, and the second control pipeline is connected to the rod chamber of the hydraulic cylinder; when the first reversing valve mechanism connects the oil delivery pipeline and When the first control pipeline is connected, the oil is used to drive the hydraulic cylinder to rise; when the first reversing valve mechanism is connected to the oil pipeline and the second control pipeline, the oil is used to drive the hydraulic cylinder to descend; the third control pipeline and the fourth control pipeline are connected to the oil pipeline through the second reversing valve mechanism, and the third control pipeline and the fourth control pipeline are both connected to the hydraulic motor; when the second reversing valve mechanism is connected to the oil pipeline and the third control pipeline, the oil is used to drive the hydraulic motor to rotate forward; when the second reversing valve mechanism is connected to the oil pipeline and the fourth control pipeline, the oil is used to drive the hydraulic motor to rotate reversely.

[0007] Optionally, the first reversing valve mechanism includes a first electromagnetic reversing valve, a first double-hydraulic-controlled one-way valve provided on the first control pipeline, and a second double-hydraulic-controlled one-way valve provided on the second control pipeline; the first electromagnetic reversing valve is a three-position four-way valve, the first electromagnetic reversing valve has a first A port, a first B port, a first P port and a first T port, the first P port is connected to the oil pump, and the first T port is connected to the oil tank; when the first electromagnetic reversing valve is in the first position, the first A port is connected to the first P port, and the first double-hydraulic-controlled one-way valve is connected to the oil delivery; the push valve is in the first position, the first A port is connected to the first P port, and the first double-hydraulic-controlled one-way valve is connected to the oil delivery; The second double hydraulically controlled one-way valve is moved to conduct the return oil, and the first B port is connected to the first T port; when the first electromagnetic reversing valve is in the second position, the first B port is connected to the first P port, and the second double hydraulically controlled one-way valve is connected to the oil delivery; the first double hydraulically controlled one-way valve is pushed to conduct the return oil, and the first A port is connected to the first T port; when the first electromagnetic reversing valve is in the third position, the first P port is cut off from the first A port, and the first P port is also cut off from the first B port, and the first double hydraulically controlled one-way valve and the second double hydraulically controlled one-way valve are both closed.

[0008] Optionally, the second reversing valve mechanism includes a second solenoid reversing valve, the second solenoid reversing valve having a second A port, a second B port, a second P port and a second T port, the second P port is connected to the oil pump, and the second T port is connected to the oil tank; when the second solenoid reversing valve is in a first position, the second A port is connected to the second P port, and the second B port is connected to the second T port; when the second solenoid reversing valve is in a second position, the second B port is connected to the second P port, and the second A port is connected to the second T port; when the second solenoid reversing valve is in a third position, the second P port is disconnected from the second A port, and the second P port is also disconnected from the second B port.

[0009] Optionally, a throttle valve is provided on the third control pipeline.

[0010] Optionally, a first check valve is provided on the oil pipeline.

[0011] Optionally, it also includes: an oil return pipeline connected to the oil tank, wherein the oil return pipeline is connected to the first T-port and the second T-port.

[0012] Optionally, a second check valve is provided on the oil return pipeline between the first T-port and the second T-port.

[0013] Optionally, an overflow valve is provided between the oil delivery pipeline and the oil return pipeline.

[0014] Optionally, a load relief solenoid valve is provided between the oil delivery pipeline and the oil return pipeline.

[0015] Optionally, it also includes: a motor, wherein the motor is used to drive the oil pump.

[0016] Correspondingly, the present invention also provides a knocking device, including: a lifting platform, a hydraulic cylinder, a box, a cam, a knocking piece, a distance sensor and the control circuit, the hydraulic cylinder is connected to the lifting platform, the box is arranged on the lifting platform, the cam is arranged in the box, one end of the knocking piece is in contact with the outer edge of the cam, and the other end of the knocking piece extends out of the box, the cam makes a rotational motion to push the knocking piece to move back and forth for knocking; the distance sensor is arranged on the box to detect the distance value between the knocking piece and the preset knocking surface.

[0017] Correspondingly, the present invention also provides a knocking device control system, including the knocking device and a controller, the controller including: a distance acquisition unit, suitable for acquiring the distance value output by the distance sensor; a mode control unit, suitable for sending a control signal to the first reversing valve mechanism and the second reversing valve mechanism to control the connection mode of the first reversing valve mechanism and the second reversing valve mechanism.

[0018] Optionally, the knocking device control system also includes a display and a remote controller, and the controller also includes: a distance sending unit, suitable for sending the distance value to the display for display; and an instruction acquisition unit, suitable for acquiring operation instructions output by the remote controller.

[0019] Correspondingly, the present invention also provides a control method applicable to the control system of the knocking device, including: obtaining the distance value output by the distance sensor; sending a control signal to the first reversing valve mechanism and the second reversing valve mechanism to control the connection mode of the first reversing valve mechanism and the second reversing valve mechanism.

[0020] Optionally, the control method further includes: sending the distance value to a display for display; and obtaining an operation instruction output by a remote controller.

[0021] Optionally, the control method also includes: comparing the acquired distance value with a preset value; when the distance value is greater than the preset value, the first reversing valve mechanism connects the oil pipeline and the first control pipeline, and the hydraulic cylinder rises until the acquired distance value is equal to the preset value; when the distance value is less than the preset value, the first reversing valve mechanism connects the oil pipeline and the second control pipeline, and the hydraulic cylinder descends until the acquired distance value is equal to the preset value.

[0022] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0023] In the technical solution of the control circuit provided by the present invention, the control circuit includes: an oil tank, an oil pump for outputting the oil in the oil tank, an oil pipeline connected to the oil pump, a first control pipeline, a second control pipeline, a hydraulic cylinder for driving the lifting platform to rise and fall, a third control pipeline, a fourth control pipeline and a hydraulic motor for rotating and driving the cam to rotate forward and reverse. The first control pipeline and the second control pipeline are connected to the oil pipeline through a first reversing valve mechanism. The first reversing valve mechanism can switch the oil delivery connection mode. When the first reversing valve mechanism connects the oil pipeline and the first control pipeline, the oil is used to drive the hydraulic cylinder to rise; when the first reversing valve mechanism connects the oil pipeline and the second control pipeline, the oil is used to drive the hydraulic cylinder to fall; thereby realizing the control of the lifting and lowering of the hydraulic cylinder. The third control pipeline and the fourth control pipeline are connected to the oil pipeline through a second reversing valve mechanism, and the second reversing valve mechanism can switch the oil delivery connection mode. When the second reversing valve mechanism is connected to the oil delivery pipeline and the third control pipeline, the oil is used to drive the hydraulic motor to rotate forward; when the second reversing valve mechanism is connected to the oil delivery pipeline and the fourth control pipeline, the oil is used to drive the hydraulic motor to rotate reversely, thereby realizing the control of the reverse rotation of the hydraulic motor. Therefore, the control circuit helps to simplify the control operation of the hydraulic cylinder and the hydraulic motor, facilitates the realization of automatic control, reduces manual workload, and improves operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the structure of a control loop according to an embodiment of the present invention;

[0025] Figure 2 is a schematic structural diagram of a striking device according to an embodiment of the present invention;

[0026] Figure 3 is a schematic structural diagram of a control system of a striking device according to an embodiment of the present invention;

[0027] Figure 4 It is a flowchart of a control method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0028] As can be seen from the background technology, the existing knocking devices still have the problems of complicated control operation steps and high manual workload.

[0029] Now let's analyze it in combination with a knocking device, which includes: a lifting platform, a box, a cam and a knocking piece. The box is arranged on the lifting platform, the cam is arranged in the box, one end of the knocking piece is in contact with the outer edge of the cam, and the other end of the knocking piece extends out of the box. The cam makes a rotary motion to push the knocking piece to move back and forth for knocking. Among them, the lifting platform is driven by an oil cylinder, and the cam is driven by a motor. The opening and closing, rising and falling of the oil cylinder, the opening and closing, and the forward and reverse rotation of the motor all need to be manually controlled, which makes the control operation of the knocking device complicated and difficult.

[0030] The inventor has studied the above-mentioned problem, and through creative work, the inventor has noticed that with the help of a control circuit, it is easy to simplify and automate the control operation of the hydraulic cylinder and the hydraulic motor.

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] refer to Figure 1 A control circuit 100 includes: an oil tank 110, an oil pump 120 for outputting the oil in the oil tank 110, a motor 130 for driving the oil pump 120, an oil pipeline 200 connected to the oil pump 120, a first control pipeline 310, a second control pipeline 320, a hydraulic cylinder 140 for driving the lifting platform to rise and fall, a third control pipeline 330, a fourth control pipeline 340 and a hydraulic motor 150 for rotating and driving a cam to rotate forward and reverse.

[0033] The first control pipeline 310 and the second control pipeline 320 are suitable for providing hydraulic oil with different flow directions to the hydraulic cylinder 140, driving the piston rod 143 of the hydraulic cylinder 140 to rise or fall, thereby driving the lifting platform to rise and fall.

[0034] In order to switch the flow direction of the hydraulic oil, the first control line 310 and the second control line 320 are connected to the oil delivery line 200 through the first reversing valve mechanism 400, the first control line 310 is connected to the rodless chamber 141 of the hydraulic cylinder 140, and the second control line 320 is connected to the rod chamber 142 of the hydraulic cylinder 140.

[0035] When the first reversing valve mechanism 400 is connected to the oil pipeline 200 and the first control pipeline 310, the oil is used to drive the hydraulic cylinder 140 to rise; when the first reversing valve mechanism 400 is connected to the oil pipeline 200 and the second control pipeline 320, the oil is used to drive the hydraulic cylinder 140 to descend.

[0036] In this embodiment, the first reversing valve mechanism 400 includes a first electromagnetic reversing valve 410 and a hydraulic lock 420 , and the hydraulic lock 420 includes a first double hydraulically controlled one-way valve 421 provided on the first control pipeline 310 and a second double hydraulically controlled one-way valve 422 provided on the second control pipeline 320 .

[0037] In this embodiment, the first electromagnetic reversing valve 410 is a three-position four-way valve having a first A port 411 , a first B port 412 , a first P port 413 and a first T port 414 , wherein the first P port 413 is connected to the oil pump 120 , and the first T port 414 is connected to the oil tank 110 .

[0038] When the first electromagnetic reversing valve 410 is in the first position, the first A port 411 is connected to the first P port 413 , and the first double hydraulically controlled one-way valve 421 is connected to oil delivery; the second double hydraulically controlled one-way valve 422 is pushed to return oil, and the first B port 412 is connected to the first T port 414 .

[0039] When the first electromagnetic reversing valve 410 is in the second position, the first B port 412 is connected to the first P port 413 , and the second double hydraulically controlled one-way valve 422 is connected to oil delivery; the first double hydraulically controlled one-way valve 421 is pushed to conduct oil return, and the first A port 411 is connected to the first T port 414 .

[0040] When the first electromagnetic reversing valve 410 is in the third position, the first P port 413 is disconnected from the first A port 411 , and the first P port 413 is also disconnected from the first B port 412 , and the first double hydraulically controlled one-way valve 421 and the second double hydraulically controlled one-way valve 422 are both closed.

[0041] The third control pipeline 330 and the fourth control pipeline 340 are connected to the oil delivery pipeline 200 via the second reversing valve mechanism 430 , and both the third control pipeline 330 and the fourth control pipeline 340 are connected to the hydraulic motor 150 .

[0042] When the second reversing valve mechanism 430 is connected to the oil pipeline 200 and the third control pipeline 330, the oil is used to drive the hydraulic motor 150 to rotate forward; when the second reversing valve mechanism 430 is connected to the oil pipeline 200 and the fourth control pipeline 340, the oil is used to drive the hydraulic motor 150 to rotate reversely.

[0043] In this embodiment, the second reversing valve mechanism 430 includes a second electromagnetic reversing valve, which has a second A port 431, a second B port 432, a second P port 433 and a second T port 434. The second P port 433 is connected to the oil pump 120, and the second T port 434 is connected to the oil tank 110.

[0044] When the second electromagnetic reversing valve is in the first position, the second A port 431 is connected to the second P port 433, and the second B port 432 is connected to the second T port 434; when the second electromagnetic reversing valve is in the second position, the second B port 432 is connected to the second P port 433, and the second A port 431 is connected to the second T port 434; when the second electromagnetic reversing valve is in the third position, the second P port 433 is disconnected from the second A port 431, and the second P port 433 is also disconnected from the second B port 432.

[0045] The control circuit 100 further includes an oil return line 500 connected to the oil tank 110 , and the oil return line 500 is in communication with the first T-port 414 and the second T-port 434 .

[0046] When the first side electromagnetic coil 415 of the first electromagnetic reversing valve 410 is energized, the first electromagnetic reversing valve 410 is in the first position, the first A port 411 and the first P port 413 are connected, the first B port 412 and the first T port 414 are connected, the oil enters the first branch pipe 311 of the first control pipeline 310 through the first P port 413, and flows to the second branch pipe 312 of the first control pipeline 310 through the first double hydraulically controlled one-way valve 421, and at the same time, the oil flows to the second double hydraulically controlled one-way valve 422 through the third branch pipe 313, so that the second double hydraulically controlled one-way valve 422 is switched to the state where the fourth branch pipe 314 and the fifth branch pipe 315 of the second control pipeline 320 are connected. The oil circulation process is: oil tank 110—oil pump 120—oil delivery pipeline 200—first branch pipe 311—second branch pipe 312—hydraulic cylinder 140—fifth branch pipe 315—fourth branch pipe 314—oil return pipeline 500—oil tank 110. During the circulation process, the piston rod 143 of the hydraulic cylinder 140 rises.

[0047] When the second side electromagnetic coil 416 of the first electromagnetic reversing valve 410 is energized, the first electromagnetic reversing valve 410 is in the second position, the first B port 412 and the first P port 413 are connected, the first A port 411 and the first T port 414 are connected, the oil enters the fourth branch pipe 314 through the first P port 413, and flows to the fifth branch pipe 315 through the second double hydraulically controlled one-way valve 422, and at the same time, the oil flows to the first double hydraulically controlled one-way valve 421 through the sixth branch pipe 316, so that the second double hydraulically controlled one-way valve 422 is switched to the state where the first branch pipe 311 and the second branch pipe 312 are connected. The oil circulation process is: oil tank 110—oil pump 120—oil delivery pipeline 200—fourth branch pipe 314—fifth branch pipe 315—hydraulic cylinder 140—second branch pipe 312—first branch pipe 311—oil return pipeline 500—oil tank 110. During the circulation process, the piston rod 143 of the hydraulic cylinder 140 descends.

[0048] When the first electromagnetic reversing valve 410 is in the third position, that is, the middle position, the first P port 413 , the first A port 411 , and the first B port 412 are all cut off, and the piston rod 143 of the hydraulic cylinder 140 is stationary.

[0049] When the first end electromagnetic coil 441 of the second electromagnetic reversing valve is energized, the second electromagnetic reversing valve is in the first position, the second A port 431 is connected to the second P port 433, and the second B port 432 is connected to the second T port 434. The circulation process of the oil is: oil tank 110 - oil pump 120 - oil delivery pipeline 200 - third control pipeline 330 - hydraulic motor 150 - fourth control pipeline 340 - oil return pipeline 500 - oil tank 110, driving the hydraulic motor 150 to rotate forward.

[0050] When the second end electromagnetic coil 442 of the second electromagnetic reversing valve is energized, the second electromagnetic reversing valve is in the second position, the second B port 432 is connected to the second P port 433, and the second A port 431 is connected to the second T port 434. The circulation process of the oil is: oil tank 110—oil pump 120—oil delivery pipeline 200—fourth control pipeline 340—hydraulic motor 150—third control pipeline 330—oil return pipeline 500—oil tank 110, driving the hydraulic motor 150 to reverse.

[0051] When the second electromagnetic reversing valve is in the third position, that is, the middle position, the second P port 433 is disconnected from the second A port 431 and the second B port 432 , and the hydraulic motor 150 stops rotating.

[0052] In this embodiment, when the first side electromagnetic coil 415 or the second side electromagnetic coil 416 of the first electromagnetic reversing valve 410 is energized, the second electromagnetic reversing valve is in the middle position. When the first end electromagnetic coil 441 or the second end electromagnetic coil 442 of the second electromagnetic reversing valve is energized, the first electromagnetic reversing valve 410 is in the middle position.

[0053] In this embodiment, a relief valve 160 is provided between the oil delivery pipeline 200 and the oil return pipeline 500 .

[0054] In this embodiment, when the first side electromagnetic coil 415, the second side electromagnetic coil 416, the first end electromagnetic coil 441 and the second end electromagnetic coil 442 of the first electromagnetic reversing valve 410 are energized, the oil pipeline 200 delivers oil to the hydraulic cylinder 140 or the hydraulic motor 150, if the overflow valve 160 detects that the oil pressure in the oil pipeline 200 exceeds a certain value, the overflow valve 160 opens, and part of the oil delivered by the oil pipeline 200 flows back to the oil tank 110 through the overflow valve 160, so that the overflow valve 160 can play a role in safe oil return.

[0055] In this embodiment, a load relief solenoid valve 170 is provided between the oil delivery pipeline 200 and the oil return pipeline 500. The load relief solenoid valve 170 does not generate heat during the startup process, which helps to achieve energy saving.

[0056] In this embodiment, when the first electromagnetic reversing valve 410 and the second electromagnetic reversing valve are both in the middle position, the unloading electromagnetic valve 170 is opened, and the oil in the oil pipeline 200 is directly transported back to the oil tank 110 through the unloading electromagnetic valve 170 .

[0057] In this embodiment, a throttle valve 180 is provided on the third control pipeline 330 .

[0058] The throttle valve 180 is suitable for controlling the oil flow delivered to the hydraulic motor 150 to adjust the rotation speed of the hydraulic motor 150. In the following embodiment in which the control circuit 100 is applied to a knocking device, the throttle valve 180 can adjust the knocking speed of the knocking member by adjusting the rotation speed of the hydraulic motor 150 to avoid excessive knocking force.

[0059] In this embodiment, a first check valve 191 is disposed on the oil pipeline 200 to limit the flow direction of the oil in the oil pipeline 200 .

[0060] In this embodiment, a second check valve 192 is disposed on the oil return pipeline 500 between the first T-port 414 and the second T-port 434 .

[0061] The second check valve 192 is used to prevent the oil output from the second T port 434 from being delivered to the first T port 414, and to prevent the oil from being further delivered to the first A port 411 or the first B port 412, thereby preventing the oil from pushing the first double hydraulically controlled one-way valve 421 or the second double hydraulically controlled one-way valve 422 to be turned on, so as to ensure that the normal working state of the hydraulic cylinder 140 is not affected.

[0062] In summary, the control circuit helps to simplify the control operation of the hydraulic cylinder 140 and the hydraulic motor 150, and is conducive to realizing automatic control.

[0063] Reference Figure 2 The present invention also provides a knocking device, including: a lifting platform 10, a hydraulic cylinder (not shown in the figure), a box 20, a cam (not shown in the figure), a knocking member 30, a distance sensor and the control circuit 100 (refer to Figure 1 ), the hydraulic cylinder is connected to the lifting platform 10, the box body 20 is arranged on the lifting platform 10, the cam is arranged in the box body 20, one end of the knocking member 30 is in contact with the outer edge of the cam, and the other end of the knocking member 30 extends out of the box body 20, and the cam makes a rotational motion to push the knocking member 30 to move back and forth for knocking; the distance sensor is arranged on the box body 20, and is used to detect the distance value between the preset knocking surface.

[0064] In this embodiment, the distance sensor is an ultrasonic distance sensor.

[0065] The knocking device further comprises: an electric control cabinet 40, which is used for arranging and installing the electric control system.

[0066] Reference Figure 3 The present invention also provides a knocking device control system, including the knocking device and a controller 700, wherein the controller 700 includes: a distance acquisition unit, adapted to acquire the distance value output by the distance sensor 610; and a mode control unit, adapted to send a control signal to the first reversing valve mechanism 400 and the second reversing valve mechanism 430 to control the connection mode of the first reversing valve mechanism 400 and the second reversing valve mechanism 430.

[0067] In this embodiment, the knocking device control system further includes a display 620 and a remote controller 630 .

[0068] The remote controller 630 is adapted to send operating instructions to the controller 700 .

[0069] The display 620 can display the striking member 30 in real time (refer to Figure 2 ) and the preset striking surface on the tunnel top, which is convenient for the operator to observe and judge.

[0070] The remote controller 630 and the display 620 facilitate remote control and judgment by operators.

[0071] In this embodiment, the controller 700 further includes: a distance sending unit, adapted to send the distance value to the display 620 for display; and an instruction acquiring unit, adapted to acquire an operation instruction output by the remote controller 630 .

[0072] The knocking device control system helps to realize the automatic control of the knocking device, further reducing the workload of the operator. Furthermore, the knocking device control system can ensure that the distance between the hammer head at the top of the knocking member 30 and the knocked surface is the same during each knocking process, and ensure that the hammer head has a constant instantaneous knocking speed and knocking force, thereby ensuring a more accurate detection effect.

[0073] Reference Figure 3 The present invention also provides a control method applicable to the control system of the knocking device, including: obtaining the distance value output by the distance sensor 610; sending a control signal to the first reversing valve mechanism 400 and the second reversing valve mechanism 430 to control the connection mode of the first reversing valve mechanism 400 and the second reversing valve mechanism 430.

[0074] In this embodiment, the control method further includes: sending the distance value to the display 620 for display; and obtaining an operation instruction output by the remote controller 630.

[0075] refer to Figure 3 and Figure 4 In another embodiment, the control method further includes: comparing the acquired distance value with a preset value; when the distance value is greater than the preset value, the first reversing valve mechanism 400 connects the oil pipeline 200 and the first control pipeline 310, and the hydraulic cylinder 140 rises until the acquired distance value is equal to the preset value; when the distance value is less than the preset value, the first reversing valve mechanism 400 connects the oil pipeline 200 and the second control pipeline 320, and the hydraulic cylinder 140 descends until the acquired distance value is equal to the preset value.

[0076] Figure 4 In the control method, the control method comprises:

[0077] Execute step S11, start;

[0078] Execute step S12 to obtain the current distance value;

[0079] Execute step S13 to determine whether the acquired distance value is equal to the preset value;

[0080] If they are not equal, executing step S14, determining whether the obtained distance value is greater than a preset value;

[0081] If the distance value obtained is greater than the preset value, step S15 is executed, and the first side electromagnetic coil 415 (reference Figure 1 ) is powered on, and the lifting platform rises; after executing step S15, re-execute step S12 and subsequent steps;

[0082] If the acquired distance value is less than the preset value, step S16 is executed, and the second side electromagnetic coil 416 (refer to Figure 1 ) is powered on, and the lifting platform descends; after executing step S16, re-execute step S12 and subsequent steps;

[0083] Execute the above steps until the acquired distance value is equal to the preset value, and then execute step S17 to end.

[0084] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A control loop, characterized in that: include: An oil tank, an oil pump for outputting the oil in the oil tank, an oil delivery pipeline connected to the oil pump, a first control pipeline, a second control pipeline, a hydraulic cylinder for driving the lifting platform to rise and fall, a third control pipeline, a fourth control pipeline and a hydraulic motor for rotating and driving the cam to rotate forward and reverse; The first control pipeline and the second control pipeline are connected to the oil delivery pipeline through a first reversing valve mechanism, the first control pipeline is connected to the rodless chamber of the hydraulic cylinder, and the second control pipeline is connected to the rod chamber of the hydraulic cylinder; When the first reversing valve mechanism is connected to the oil delivery pipeline and the first control pipeline, the oil is used to drive the hydraulic cylinder to rise; when the first reversing valve mechanism is connected to the oil delivery pipeline and the second control pipeline, the oil is used to drive the hydraulic cylinder to descend; The third control pipeline and the fourth control pipeline are connected to the oil delivery pipeline through a second reversing valve mechanism, and the third control pipeline and the fourth control pipeline are both connected to the hydraulic motor; When the second reversing valve mechanism is connected to the oil delivery pipeline and the third control pipeline, the oil is used to drive the hydraulic motor to rotate forward; when the second reversing valve mechanism is connected to the oil delivery pipeline and the fourth control pipeline, the oil is used to drive the hydraulic motor to rotate reversely; The first reversing valve mechanism includes a first electromagnetic reversing valve, a first double-hydraulic-controlled one-way valve provided on the first control pipeline, and a second double-hydraulic-controlled one-way valve provided on the second control pipeline; The first electromagnetic reversing valve is a three-position four-way valve, and has a first A port, a first B port, a first P port and a first T port, the first P port is connected to the oil pump, and the first T port is connected to the oil tank; When the first electromagnetic reversing valve is in the first position, the first A port is connected to the first P port, and the first double hydraulically controlled one-way valve is connected to oil delivery; the second double hydraulically controlled one-way valve is pushed to conduct oil return, and the first B port is connected to the first T port; When the first electromagnetic reversing valve is in the second position, the first B port is connected to the first P port, and the second double hydraulically controlled one-way valve is connected to oil delivery; the first double hydraulically controlled one-way valve is pushed to conduct oil return, and the first A port is connected to the first T port; When the first electromagnetic reversing valve is in the third position, the first P port is disconnected from the first A port, and the first P port is also disconnected from the first B port, and the first double hydraulically controlled one-way valve and the second double hydraulically controlled one-way valve are both closed; The second reversing valve mechanism comprises a second electromagnetic reversing valve, the second electromagnetic reversing valve has a second A port, a second B port, a second P port and a second T port, the second P port is connected to the oil pump, and the second T port is connected to the oil tank; When the second electromagnetic reversing valve is in the first position, the second A port is connected to the second P port, and the second B port is connected to the second T port; When the second electromagnetic reversing valve is in the second position, the second B port is connected to the second P port, and the second A port is connected to the second T port; When the second electromagnetic reversing valve is in the third position, the second P port is disconnected from the second A port, and the second P port is also disconnected from the second B port.

2. The control circuit according to claim 1, characterized in that: The third control pipeline is provided with a throttle valve.

3. The control circuit according to claim 1, characterized in that: The oil pipeline is provided with a first check valve.

4. The control circuit according to claim 1, characterized in that: Also includes: An oil return pipeline is connected to the oil tank, and the oil return pipeline is in communication with the first T-port and the second T-port.

5. The control circuit according to claim 4, characterized in that: A second check valve is provided on the oil return pipeline between the first T port and the second T port.

6. The control circuit according to claim 4, characterized in that An overflow valve is provided between the oil delivery pipeline and the oil return pipeline.

7. The control circuit according to claim 6, characterized in that A load relief solenoid valve is provided between the oil delivery pipeline and the oil return pipeline.

8. The control circuit according to claim 1, characterized in that: Also includes: A motor is used to drive the oil pump.

9. A striking device, characterized in that: include: A lifting platform, a hydraulic cylinder, a box, a cam, a knocking piece, a distance sensor and a control circuit as described in any one of claims 1 to 8, wherein the hydraulic cylinder is connected to the lifting platform, the box is arranged on the lifting platform, the cam is arranged in the box, one end of the knocking piece is in contact with the outer edge of the cam, and the other end of the knocking piece extends out of the box, and the cam makes a rotational motion to push the knocking piece to move back and forth for knocking; the distance sensor is arranged on the box to detect the distance value between the knocking piece and the preset knocking surface.

10. A striking device control system, characterized in that: The striking device according to claim 9 further comprises a controller, wherein the controller comprises: A distance acquisition unit, adapted to acquire a distance value output by the distance sensor; The mode control unit is adapted to send a control signal to the first reversing valve mechanism and the second reversing valve mechanism to control a communication mode between the first reversing valve mechanism and the second reversing valve mechanism.

11. The striking device control system according to claim 10, characterized in that: It also includes a display and a remote controller, and the controller also includes: A distance sending unit, adapted to send the distance value to a display for display; The instruction acquisition unit is adapted to acquire the operation instruction output by the remote controller.

12. A control method, applicable to the percussion device control system according to claim 10, characterized in that: include: Get the distance value output by the distance sensor; A control signal is sent to the first reversing valve mechanism and the second reversing valve mechanism to control the communication mode of the first reversing valve mechanism and the second reversing valve mechanism.

13. The control method according to claim 12, characterized in that: Also includes: Sending the distance value to a display for display; Get the operation command output by the remote control.

14. The control method according to claim 12, characterized in that: Also includes: Comparing the obtained distance value with a preset value; When the distance value is greater than the preset value, the first reversing valve mechanism connects the oil delivery pipeline and the first control pipeline, and the hydraulic cylinder rises until the acquired distance value is equal to the preset value; When the distance value is less than the preset value, the first reversing valve mechanism connects the oil delivery pipeline and the second control pipeline, and the hydraulic cylinder descends until the acquired distance value is equal to the preset value.

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