Electric control emergency system of crane and control method of electric control emergency system

Abstract

The invention discloses a crane electric control emergency system and a control method thereof. The crane electric control emergency system comprises a control unit and a plurality of wire harnesses, one end of each wire harness is connected with one port of the control unit, and the other end of each wire harness is provided with one or more interfaces which are used for connecting corresponding control objects or data acquisition objects in the crane; and the control unit completes emergency control of the crane based on the collected crane state data and a preset control strategy. The electric control emergency system independent of the original crane electric control system is connected with the crane hydraulic system, so that the emergency operation of the crane is realized, and the safety is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of construction machinery, and particularly relates to an electric control emergency system for a crane and a control method thereof. Background Art

[0002] The electric control system is widely used in crane products. The application of electrical components such as displays, controllers, load limiters, and sensors has improved the intelligence, safety, maneuverability, and integration of crane products. However, due to the harsh working environment of construction machinery, the electric control system may fail, resulting in the sudden stop of the crane that is lifting a load. Although the electric control system has a fault self-diagnosis function, if the fault point of the electric control system is difficult to troubleshoot, repair, or there is a lack of electrical professional service personnel, such as when the controller or load limiter is damaged, there will be a greater safety risk if the emergency vehicle recovery cannot be completed.

[0003] Currently, when the electric control system of a crane fails, the general treatment method is for the operator or service personnel to perform repairs based on the fault phenomenon and the diagnostic information of the display. Ordinary problems can be solved by this method; however, when the fault point is difficult to troubleshoot and repair, such as when the controller or load limiter is damaged, it can only be handled by replacing the controller or load limiter, and the software program flashing operation needs to be completed, which has a long cycle. There are major safety risks such as tipping for the crane with the lifted load in the working position.

[0004] In the Chinese utility model patent with the application number 201920434108.X, a crane emergency control system is disclosed, which includes two parts: a hydraulic system and an electrical system. Among them, the electrical part consists of: an electrical control cabinet, a fuse, an emergency stop switch, a knob switch, a PWM pulse signal generator, and a diode. There are problems such as complex circuits and wiring harnesses, difficult to use (the user needs to understand the current magnitude of the solenoid valve and there is a process of manually adjusting the current), safety risks during use (when the designed current of the personnel is large, the work responds too quickly), poor versatility, and few emergency actions. Summary of the Invention

[0005] In view of the above problems, the present invention proposes an electric control emergency system for a crane and a control method thereof. By connecting the electric control emergency system independent of the original electric control system of the crane to the crane hydraulic system, the emergency operation of the crane is realized, and the safety is improved.

[0006] In order to achieve the above technical objectives and reach the above technical effects, the present invention is realized through the following technical solutions: In the first aspect, the present invention provides an electric control emergency system for a crane, including a control unit and several wire harnesses; One end of each wire harness is connected to one of the ports of the control unit, and the other end is provided with one or more interfaces for connecting corresponding control objects or data acquisition objects in the crane; Based on the collected crane status data, the control unit completes the emergency control of the crane according to the preset control strategy.

[0007] In combination with the first aspect, optionally, the control unit is of a split structure, including a box body, a controller, a display, and an operation switch; The controller, the display, and the operation switch are fixed to the box body through wire harnesses and connecting elements; wherein, the display and the operation switch are arranged on the outer surface of the box body.

[0008] In combination with the first aspect, optionally, the control unit is of an integrated structure, including a display and control integrated machine, on the outer surface of which there are a display and an operation switch, and inside which there is a controller connected to the display and the operation switch.

[0009] In combination with the first aspect, optionally, for the luffing system in the crane, the luffing system includes a main boom, an extension and luffing pump, a luffing cylinder, and a luffing control solenoid valve, and the preset control strategy includes: First, open the main valve in the crane, delay opening the extension and luffing pump, and control the current of the extension and luffing pump to increase linearly to complete the luffing-up operation; And / or, when the lowering action stops, first control the current of the extension and luffing pump to decrease to 0 according to the descending slope, then control the current of the luffing solenoid valve to 0, and after a delay, close the main valve in the crane to complete the non-powered lowering operation; And / or, when the angle of the main boom is greater than the preset angle, control the corresponding luffing solenoid valve to be energized to achieve powered lowering.

[0010] In combination with the first aspect, optionally, for the luffing system in the crane, the control unit, based on the collected crane status data, displays in real time the pressures of the large and small chambers of the extension and luffing pump and the luffing cylinder. The pressure of the extension and luffing pump comes from a pressure sensor arranged at the extension and luffing pump, and the pressures of the large and small chambers of the luffing cylinder come from pressure sensors arranged at the valve block of the luffing cylinder.

[0011] In combination with the first aspect, optionally, for the telescoping system in the crane, the telescoping system includes a cylinder pin, an arm pin, a proportional solenoid valve, and a telescoping cylinder, and the preset control strategy includes: Control that the cylinder pin and the arm pin cannot act simultaneously; And / or, when performing a dangerous action, the engine speed is matched with the opening of the proportional solenoid valve to achieve the control of the main boom working condition by the limit power of the engine; the proportional solenoid valve is connected to the telescoping cylinder; And / or, the telescoping-in action retracts the boom in sequence from the first-stage boom to the N-stage boom, otherwise the telescoping-in action of the boom is not allowed to be executed; And / or, the order of restricting the telescopic boom movement is: pull out the cylinder pin → find the boom position → insert the cylinder pin → pull out the boom pin → retract the boom → insert the boom pin, pull out the boom pin → retract the boom → insert the boom pin.

[0012] In combination with the first aspect, optionally, for the telescopic system in the crane, the telescopic system further includes a telescopic cylinder pressure sensor, a telescopic cylinder length sensor, a boom position detection switch, and a locking and unlocking detection switch for the cylinder-boom pin. The telescopic cylinder pressure sensor is connected to the telescopic cylinder. The telescopic cylinder length sensor is arranged at the tail of the main boom. The boom position detection switch is arranged on the side of the telescopic cylinder. The locking and unlocking detection switch for the cylinder-boom pin is arranged on the cylinder-boom pin. The control unit receives the output signals of the telescopic cylinder pressure sensor, the telescopic cylinder length sensor, the boom position detection switch, and the locking and unlocking detection switch for the cylinder-boom pin, and displays them to confirm the pressure of the telescopic cylinder, the telescopic length of the telescopic cylinder, the position of the telescopic cylinder, and the unlocking state of the cylinder-boom pin.

[0013] In combination with the first aspect, optionally, for the slewing system in the crane, the slewing system includes a slewing pump pressure sensor, a slewing pressure cut-off relay, a turntable locking pin detection switch, and a slewing encoder. The preset control strategy includes: First, release the slewing brake to de-energize the corresponding slewing brake solenoid valve. Then, detect whether the slewing brake pedal is in the braking state, and based on the output data of the turntable locking pin detection switch, determine whether the turntable is slewing-locked, and control the energizing state of the locking cylinder solenoid valve to realize the action of the locking cylinder. Control the slewing direction and cooperate with the throttle to jointly determine the slewing speed. When the slewing brake pedal is operated, the slewing brake is immediately closed, and the handle output current is 0 without delay.

[0014] A slewing pressure cut-off relay is installed at port A of the slewing brake as a basic component for fault diagnosis and detection. When the brake is opened and the pressure at port A < 20 bar, it is considered that the slewing brake is not fully opened, and an alarm signal is given without restricting the action. The control unit receives and displays the pressure of the hydraulic system in the slewing action part during the operation of the slewing system output by the slewing pump pressure sensor, and receives and displays the current slewing angle position information output by the slewing encoder.

[0015] In combination with the first aspect, optionally, for the hoisting system in the crane, the hoisting system includes a hoisting pressure sensor, a pressure relay, a motor speed sensor, a three-turn protection, and a height limiter. The hoisting pressure sensor is connected to the hoisting pump. The motor speed sensor is connected to the hoisting motor. The preset control strategy includes: And / or, the hoisting pumps are all closed-loop variable pumps, and the control current is 200 - 600 mA, and the current increases linearly with the handle angle. And / or, the hoisting motor is a variable motor, and the control current is 200 - 500 mA; And / or, first adjust the pump set, and when the pump set reaches the maximum displacement, then adjust the motor, and the two achieve segmented control; And / or, within the height limit range, the hoisting operation is allowed. If the hoisting encounters the height limiter, the hoisting lift is prohibited; when the three-turn protection takes effect, the hoisting lowering is prohibited; And / or, the pressure relay detects whether the hoisting motor stalls. If the hoisting motor stalls, the brake connected to the hoisting motor is controlled to brake; The control unit receives and displays the internal pressure of the hoisting system output by the hoisting pressure sensor, the motor speed output by the motor speed sensor, and the length of the hoisting wire rope obtained by converting based on the motor speed ratio and the diameter of the hoisting drum.

[0016] In a second aspect, the present invention provides a control method for a crane electric control emergency system according to any one of the first aspects, characterized by including: Collect crane status data from the crane using a wire harness; Use the control unit to complete the emergency control of the crane based on the collected crane status data and based on a preset control strategy..

[0017] Compared with the prior art, the beneficial effects of the present invention: The present invention uses an electric control emergency system independent of the original crane electric control system to connect with the crane hydraulic system, which can realize the emergency operation and vehicle recovery of the crane, facilitating maintenance personnel to quickly, safely and conveniently operate the crane to complete emergency vehicle recovery in the case of difficult troubleshooting and repair of the original electric control system failure problems, and avoiding major safety accidents caused by the failure problems not being solved for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where: Figure 1 It is a composition diagram of a dual-engine crane system according to an embodiment of the present invention; Figure 2 It is a composition diagram of a single-engine crane system according to an embodiment of the present invention; Figure 3 It is a top view of a display and control integrated machine according to an embodiment of the present invention; In the figure: 1 - display, 2 - operation switch. Detailed implementation mode

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0020] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may also include different values. It should be noted that: similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in the subsequent drawings.

[0021] In the description of the present invention, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, exceeding, etc. are understood as not including the present number, and above, below, within, etc. are understood as including the present number. If there is a description of first and second, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0022] In the description of the present invention, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0023] The following will describe in detail the application principle of the present invention with reference to the accompanying drawings. Embodiment 1

[0024] In an embodiment of the present invention, an electric control emergency system for a crane is provided. As Figure 1 and Figure 2 shown, it includes a control unit and several wire harnesses; One end of each wire harness is connected to one of the ports of the control unit, and the other end is provided with one or more interfaces for connecting corresponding control objects or data acquisition objects in the crane; Based on the collected crane status data, the control unit completes the emergency control of the crane based on a preset control strategy.

[0025] Based on the above solution, by connecting the electric control emergency system independent of the original crane electric control system to the crane hydraulic system, the emergency operation and vehicle recovery of the crane can be realized, which is convenient for maintenance personnel to quickly, safely and conveniently operate the crane to complete emergency vehicle recovery in the case of difficult troubleshooting and repair of the original electric control system failure problems, and avoid major safety accidents caused by the long-term failure to solve the failure problems.

[0026] In a specific embodiment of the embodiment of the present invention, the control unit is of a split structure and includes a box body, a controller, a display and an operation switch; The controller, the display and the operation switch are fixed to the box body through wire harnesses and connecting elements; wherein, the display and the operation switch are arranged on the outer surface of the box body.

[0027] In the above solution, by arranging the display and the operation switch on the outer surface of the box body, it is convenient for the operator to observe and operate. The controller is used for controlling logic execution and control signal output; the display is used for displaying system information and function operations, and the system information mainly includes the working state of solenoid valves, engine parameters, sensor parameters, etc.; the operation switch is used for function operations, which can meet more operation requirements, such as handle operation for slewing, hoisting up and down, etc.; the wire harness is used to connect the electric control emergency system to the crane hydraulic system, engine, sensors, etc.

[0028] In a specific embodiment of the embodiment of the present invention, as Figure 3 shown, the control unit is of an integrated structure and includes a display and control integrated machine, and a display 1 and an operation switch 2 are arranged on the outer surface of the display and control integrated machine, and a controller connected to the display 1 and the operation switch 2 is arranged inside.

[0029] In the above solution, the display and control integrated machine includes logic control, display system information and operation control functions. The integration degree of the display and control integrated machine is relatively high, the volume is smaller, it is convenient to use and carry, and it is also more convenient for later function expansion and mass application in the market; the advantages of selecting this type of display and control integrated machine include: 1) It is convenient and easy for personnel to operate and transport and carry; 2) The wire harness composition is simple and the connection and use are clear.

[0030] In a specific implementation manner of an embodiment of the present invention, according to emergency operations such as telescoping of the main boom, inserting and removing the boom pin, luffing up and down, slewing of the turntable, hoisting of the main winch up and down, hoisting of the auxiliary winch up and down, telescoping of the counterweight cylinder, locking and unlocking of the turntable locking pin, etc., the number of solenoid valves involved in the logic control is relatively large, that is, the number of ports required for the digital and analog controllers is relatively large; however, when the crane makes an emergency retraction, different working devices in the crane may not perform actions simultaneously, and some actions need to be performed simultaneously. Therefore, the function control ports of the control unit need to be multiplexed; the interfaces of different solenoid valves are different. Therefore, when designing the wiring harness, the wiring harness for multiplexing the controller ports needs to meet the requirement of connecting solenoid valve heads with different interfaces, that is, the wiring harness is designed as a tree structure, with only one interface at one end of the wiring harness and several interfaces at the other end of the wiring harness.

[0031] In a specific implementation manner of an embodiment of the present invention, the software design of the control unit includes a display program and a controller program. Since the display is small and there is a lot of information on one interface, it is not clear enough. Therefore, in the specific implementation process, only 4 interfaces can be designed, including telescoping / winch, luffing / winch, slewing, and auxiliary. The current interface includes action icons, corresponding solenoid valve numbers, and solenoid valve working states, which are convenient for guiding the operator to manually adjust the valve plug and master the working state of the crane. The specific operations include: telescoping of the main boom in / out, hoisting of the main winch up / down, hoisting of the auxiliary winch up / down, luffing up / down, slewing left / right, lifting / lowering of the counterweight cylinder, locking / unlocking of the turntable locking pin, cylinder / boom pin switch, engine control, etc. As Figure 1 shown, for a double-engine crane, the controller of the electric control emergency system realizes the control of the engine speed of the upper vehicle and the reading of working information through CAN bus messages; as Figure 2 shown, for a single-engine crane, the controller is connected and communicates with the lower vehicle engine controller, the lower vehicle electrical control system, and the lower vehicle transfer case through the CAN bus to realize the control, power take-off, and monitoring of the lower vehicle engine. Both forms achieve the provision and control of the power required for the operation of the hydraulic system; the solenoid valves and the original crane working device detection sensors in the hydraulic system are used for the action execution and working state detection of the crane working devices.

[0032] In a specific implementation manner of an embodiment of the present invention, for the luffing system in the crane, the luffing system includes a main boom, an extension and variable pump, a luffing cylinder, and a luffing control solenoid valve. To make the luffing system have a smaller operation impact, the preset control strategy includes: First, open the main valve in the crane, delay the opening of the extension and variable pump, and control the current of the extension and variable pump to increase linearly to complete the luffing up operation; And / or, when the lowering action stops, first control the current of the extension and variable pump to decrease to 0 according to the descending slope, then control the current of the luffing solenoid valve to 0, and delay to close the main valve in the crane to complete the non-powered lowering operation; And / or, when the angle of the main boom is greater than a preset angle, control the corresponding luffing solenoid valve to be energized to achieve power lowering. In the specific implementation process, the corresponding luffing solenoid valve can be controlled to be energized by operating a switch.

[0033] In a specific implementation manner of the embodiment of the present invention, for the luffing system in a crane, the control unit based on the collected crane state data, displays the pressures of the extension and luffing pumps and the large and small chambers of the luffing cylinder in real time. The pressure of the extension and luffing pump comes from a pressure sensor provided at the extension and luffing pump, and the pressures of the large and small chambers of the luffing cylinder come from pressure sensors provided at the valve block of the telescopic cylinder, and determines whether the crane's electric control emergency system is abnormal.

[0034] In a specific implementation manner of the embodiment of the present invention, for the telescopic system in a crane, the telescopic system includes cylinder pins, arm pins, proportional solenoid valves, and telescopic cylinders. In order to make the telescopic system have better controllability (good micro-movement, small operation impact, etc.), the preset control strategy includes: Control the cylinder pins and arm pins not to act simultaneously; And / or, when performing a dangerous action, the engine speed is matched with the opening of the proportional solenoid valve to achieve the control of the main boom working condition by the limit power of the engine; the proportional solenoid valve is connected to the telescopic cylinder; And / or, the retracting arm action retracts the arms in sequence from the first arm to the Nth arm, otherwise the retracting arm retraction action is not allowed to be executed; And / or, limit the retracting arm action sequence to: pulling out the cylinder pin → finding the arm position → inserting the cylinder pin → pulling out the arm pin → retracting the arm → inserting the arm pin (retracting the non-current arm), pulling out the arm pin → retracting the arm → inserting the arm pin (retracting the current arm).

[0035] In a specific implementation manner of the embodiment of the present invention, for the telescopic system in a crane, in order to ensure that the operator grasps the working state of the main boom and the safety of operating the telescopic movement, the telescopic system further includes a telescopic cylinder pressure sensor, a telescopic cylinder length sensor, an arm position detection switch, and a cylinder and arm pin locking and unlocking detection switch. The telescopic cylinder pressure sensor is connected to the telescopic cylinder. The telescopic cylinder length sensor is provided at the tail of the main boom. The arm position detection switch is provided on the side of the telescopic cylinder. The cylinder and arm pin locking and unlocking detection switch is provided on the cylinder and arm pin. The control unit receives the output signals of the telescopic cylinder pressure sensor, the telescopic cylinder length sensor, the arm position detection switch, and the cylinder and arm pin locking and unlocking detection switch, and displays them for confirming the pressure of the telescopic cylinder, the telescopic length of the telescopic cylinder, the position of the telescopic cylinder, and the unlocking state on the cylinder and arm pin.

[0036] In a specific implementation manner of the embodiment of the present invention, for the slewing system in a crane, the slewing system includes a slewing pump pressure sensor, a slewing pressure cut-off relay, a turntable locking pin detection switch, and a slewing encoder. The preset control strategy includes: First, release the slewing brake so that the corresponding slewing brake solenoid valve loses power; Then, detect whether the slewing brake pedal is in the braking state, and determine whether the turntable is slewing locked based on the output data of the turntable locking pin detection switch, and control the power-on state of the locking cylinder solenoid valve to realize the action of the locking cylinder; Control the slewing direction, cooperate with the throttle, and jointly determine the slewing speed; when the slewing brake pedal is operated, the slewing brake is immediately closed, and the handle output current is 0, without delay.

[0037] A slewing pressure cut-off relay is installed at port A of the slewing brake as a basic component for fault diagnosis and detection. When the brake is opened and the pressure at port A < 20 bar, it is considered that the slewing brake is not fully opened, and an alarm signal is given without restricting the action; The control unit receives and displays the pressure of the hydraulic system in the slewing system during the slewing operation part output by the slewing pump pressure sensor, and receives and displays the current slewing angle position information output by the slewing encoder.

[0038] In a specific implementation manner of the embodiment of the present invention, for the hoisting system in a crane, the hoisting system includes a hoisting pressure sensor, a pressure relay, a motor speed sensor, a three-turn protection, and a height limiter. The hoisting pressure sensor is connected to the hoisting pump, and the motor speed sensor is connected to the hoisting motor for confirming the working state of the hydraulic system and the hoisting operation (whether the hoisting wire rope is over-released and the height limit, whether the motor stalls, etc.); the preset control strategy includes: The hoisting pumps are all closed-loop variable pumps, and the control current is 200 - 600 mA, and the current increases linearly with the handle angle; And / or, the hoisting motor is a variable motor, and the control current is 200 - 500 mA; And / or, first adjust the pump group, and when the pump group reaches the maximum displacement, then adjust the motor, and the two achieve segmented control; And / or, within the height limit range, the hoisting operation is allowed. If the hoisting touches the height limiter, the hoisting lift is prohibited; when the three-turn protection takes effect, the hoisting fall is prohibited; And / or, the pressure relay detects whether the hoisting motor stalls. If the hoisting motor stalls, control the brake connected to the hoisting motor to brake; in the specific implementation process, when the pressure relay detects that the pressure is lower than 10 bar, it is considered a stall, and when it is higher than 10 bar, the hoisting resumes operation.

[0039] The control unit receives and displays the internal pressure of the hoisting system output by the hoisting pressure sensor, the motor speed output by the motor speed sensor, and the length of the hoisting wire rope obtained by converting based on the motor speed ratio and the hoisting drum diameter. Embodiment 2

[0040] In an embodiment of the present invention, a control method for a crane electric control emergency system according to any one of the embodiments 1 is provided, including: Collecting crane status data from corresponding sensors or solenoid valves using a wiring harness; Using a control unit to complete the emergency control of the crane based on the collected crane status data and a preset control strategy.

[0041] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for facilitating the description of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the protected content of the present invention.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric control emergency system for a crane, characterized in that, It includes a control unit and several wire harnesses; One end of each wire harness is connected to one of the ports of the control unit, and the other end is provided with one or more interfaces for connecting corresponding control objects or data acquisition objects in the crane; Based on the collected crane status data and a preset control strategy, the control unit completes the emergency control of the crane.

2. The electric control emergency system for a crane according to claim 1, wherein: The control unit is of a split structure and includes a box body, a controller, a display, and an operation switch; The controller, the display, and the operation switch are fixed to the box body through wire harnesses and connecting elements; among them, the display and the operation switch are arranged on the outer surface of the box body.

3. The electric control emergency system for a crane according to claim 1, characterized in that: The control unit is of an integrated structure and includes a display and control integrated machine. A display and an operation switch are arranged on the outer surface of the display and control integrated machine, and a controller connected to the display and the operation switch is arranged inside it.

4. An electric control emergency system for a crane according to claim 1, characterized in that: For the luffing system in the crane, the luffing system includes a main boom, an extension and luffing pump, a luffing cylinder, and a luffing control solenoid valve. The preset control strategy includes: First, open the main valve in the crane, delay opening the extension and luffing pump, and control the current of the extension and luffing pump to increase linearly to complete the luffing up operation; And / or, when the lowering action stops, first control the current of the extension and luffing pump to decrease to 0 according to a descending slope, then control the current of the luffing solenoid valve to 0, and after a delay, close the main valve in the crane to complete the non-powered lowering operation; And / or, when the angle of the main boom is greater than a preset angle, control the corresponding luffing solenoid valve to be energized to achieve powered lowering.

5. An electric control emergency system for a crane according to claim 4, characterized in that: For the luffing system in the crane, based on the collected crane status data, the control unit displays the pressures of the large and small chambers of the extension and luffing pump and the luffing cylinder in real time. The pressure of the extension and luffing pump comes from a pressure sensor arranged at the extension and luffing pump, and the pressures of the large and small chambers of the luffing cylinder come from pressure sensors arranged at the valve block of the luffing cylinder.

6. The electric control emergency system of a crane according to claim 1, wherein: For the telescoping system in the crane, the telescoping system includes a cylinder pin, an arm pin, a proportional solenoid valve, and a telescoping cylinder. The preset control strategy includes: Control that the cylinder pin and the arm pin cannot act simultaneously; And / or, when performing a dangerous action, the engine speed is matched with the opening of the proportional solenoid valve to achieve the limit power control of the main boom working condition by the engine; the proportional solenoid valve is connected to the telescoping cylinder; And / or, the telescoping arm retraction action retracts the telescoping arm in sequence from the first-stage arm to the N-stage arm, otherwise the telescoping arm retraction action is not allowed to be executed; And / or, limit the telescoping arm retraction action sequence to: pull out the cylinder pin → find the arm position → insert the cylinder pin → pull out the arm pin → retract the telescoping arm → insert the arm pin, pull out the arm pin → retract the telescoping arm → insert the arm pin.

7. An electric control emergency system for a crane according to claim 6, characterized in that: For the telescopic system in a crane, the telescopic system further includes a telescopic cylinder pressure sensor, a telescopic cylinder length sensor, an arm position detection switch, and a locking and unlocking detection switch for the cylinder-arm pin. The telescopic cylinder pressure sensor is connected to the telescopic cylinder. The telescopic cylinder length sensor is provided at the tail of the main boom. The arm position detection switch is provided on the side of the telescopic cylinder. The locking and unlocking detection switch for the cylinder-arm pin is provided on the cylinder-arm pin. The control unit receives the output signals of the telescopic cylinder pressure sensor, the telescopic cylinder length sensor, the arm position detection switch, and the locking and unlocking detection switch for the cylinder-arm pin, and displays them for confirming the pressure of the telescopic cylinder, the telescopic length of the telescopic cylinder, the position of the telescopic cylinder, and the unlocking state of the cylinder-arm pin.

8. The electric control emergency system for a crane according to claim 1, characterized in that: For the slewing system in a crane, the slewing system includes a slewing pump pressure sensor, a slewing pressure cut-off relay, a turntable locking pin detection switch, and a slewing encoder. The preset control strategy includes: First, release the slewing brake to de-energize the corresponding slewing brake solenoid valve. Then, detect whether the slewing brake pedal is in the braking state, and based on the output data of the turntable locking pin detection switch, determine whether the turntable is slewing-locked, and control the energizing state of the locking cylinder solenoid valve to realize the action of the locking cylinder. Control the slewing direction and cooperate with the throttle to jointly determine the slewing speed. When the slewing brake pedal is operated, the slewing brake is immediately closed, and the handle output current is 0 without delay. A slewing pressure cut-off relay is installed at port A of the slewing brake as a basic component for fault diagnosis and detection. When the brake is opened and the pressure at port A < 20 bar, it is considered that the slewing brake is not fully opened, and an alarm signal is given without restricting the action. The control unit receives and displays the pressure of the hydraulic system in the slewing action part during the operation of the slewing system output by the slewing pump pressure sensor, and receives and displays the current slewing angle position information output by the slewing encoder.

9. The electric control emergency system for a crane according to claim 1, characterized in that: For the hoisting system in a crane, the hoisting system includes a hoisting pressure sensor, a pressure relay, a motor speed sensor, a three-turn protection, and a height limiter. The hoisting pressure sensor is connected to the hoisting pump. The motor speed sensor is connected to the hoisting motor. The preset control strategy includes: The hoisting pumps are all closed-loop variable pumps, and the control current is 200 - 600 mA, and the current increases linearly with the handle angle. And / or, the hoisting motor is a variable motor, and the control current is 200 - 500 mA. And / or, first adjust the pump group, and when the pump group reaches the maximum displacement, then adjust the motor, and the two achieve segmented control. And / or, within the height limit range, hoisting is allowed. If the hoisting touches the height limiter, hoisting upward is prohibited. When the three-turn protection takes effect, hoisting downward is prohibited. And / or, the pressure relay detects whether the hoisting motor stalls. If the hoisting motor stalls, control the brake connected to the hoisting motor to brake. The control unit receives and displays the internal pressure of the hoisting system output by the hoisting pressure sensor, the motor speed output by the motor speed sensor, and the length of the hoisting wire rope obtained by converting based on the motor speed ratio and the diameter of the hoisting drum.

10. A control method for a hoisting machine electric control emergency system according to any one of claims 1-9, characterized in that, Including: Collect crane status data from the crane using a wiring harness. The control unit uses the collected crane status data and based on a preset control strategy to complete the emergency control of the crane.

Images