Crown block lifting hook control device and method

Abstract

The invention discloses a crown block lifting hook control device and method, and aims to solve the technical problem of low control accuracy of a crown block lifting hook in the prior art. The crown block lifting hook control device comprises a power module, a motor module, a frequency converter module and a control module, the motor module and the control module are connected with the power module, the frequency converter module is connected to a lifting hook lifting motor in the motor module, and lifting control over a crown block lifting hook is achieved through a frequency converter. A more accurate lifting hook stroke control effect is obtained, and the defects of a traditional alternating current contactor control mode are remarkably overcome. According to the crown block lifting hook control method, accurate control over the lifting hook is achieved through the crown block control device. And a motor in the motor module is controlled through a control signal sent by the remote controller, so that the movement of the crown block lifting hook is controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of overhead crane control, and in particular to an overhead crane hook control device and method. Background Art

[0002] In modern industrial production, lifting machinery is an indispensable equipment in the process of material handling and installation. Especially in the fields of heavy industry and construction, the use of cranes has greatly improved the efficiency and safety of operations. However, with the increasing demand for production automation and precision manufacturing, the requirements for crane control accuracy are also getting higher and higher. The original control of the crane hook is mainly controlled by the remote control driving the AC contactor. This method has obvious limitations when performing delicate operations such as the disassembly and assembly of locomotive auxiliary motors. Specifically, the hook stroke caused by each operation of the remote control is large, about 110mm, which will lead to low accuracy of shaft hole alignment in occasions where precise alignment is required, such as when the motor rotor shaft passes through the bearing hole of the motor end cover for installation. Due to the inaccuracy of the hook stroke, the rotor coil is prone to collide with the stator winding during installation, which not only increases the difficulty of assembly, but also may cause damage to the motor, thereby affecting the smooth progress of the entire production process.

[0003] In addition, due to the uncontrollability of the hook stroke, operators need to repeatedly adjust the hook position when performing fine operations, which undoubtedly increases the complexity and workload of the operation and reduces work efficiency. At the same time, frequent adjustments also increase the risk of equipment wear and failure, and put forward higher requirements for equipment maintenance.

[0004] In order to solve these problems and improve the accuracy and work efficiency of hook control, a new crane hook control scheme is proposed, which transforms the original AC contactor control system through inverter soft start control. In this transformation scheme, the lifting and lowering control signal of the hook is still sent by the remote control, but the specific control of lifting and lowering is realized by the function parameter setting of the inverter. Through the inverter, the lifting and lowering speed of the hook motor can be accurately controlled, so that the lifting and lowering displacement of the hook can be adjusted at will and controlled within the range of 2-3mm, thereby achieving more precise control. Summary of the invention

[0005] The object of the present invention is to provide a crane hook control device and method to overcome the disadvantage of low control accuracy of the crane hook in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: A crane hook control device, characterized in that the crane hook control device comprises: A power module inputs power through a circuit breaker QF1, and the circuit breaker QF1 is connected to a fuse FU1 and a fuse FU2; The motor module includes a hook lifting motor M1, a trolley running motor M2 and a carriage running motor, wherein the hook lifting motor M1 is connected between the fuse FU1 and the fuse FU2, and the trolley running motor M2 and the carriage running motor are connected in parallel with the hook lifting motor M1 after the fuse FU2; The inverter module includes an inverter VFD, several small relays, and an inverter protection module. The inverter VFD is connected to the hook lifting motor M1, and the small relays and inverter protection module are installed on the inverter VFD; The control module includes a control button and a remote controller. The control module is connected to the power module through a control transformer TC. The control button is the main switch of the control device, and the remote controller sends a control signal.

[0007] Furthermore, the circuit module also includes a plurality of contacts, which are distributed on the circuits connecting the hook lifting motor M1, the trolley running motor M2 and the carriage running motor with the power module.

[0008] Furthermore, the contact includes: Contact KM1, main contact of power supply AC contactor, is located between fuse FU1 and hook lifting motor M1; Contact KM2 and contact KM3 are the main contacts of the trolley running north-south control AC contactor, located between the trolley running motor M2 and the fuse FU2; Contacts KM4 and KM5, the main contacts of the AC contactor for controlling the east and west movement of the trolley, are located between the trolley running motor and fuse FU2.

[0009] Furthermore, the contact KM1 is a normally open contact, and the contact KM2, the contact KM3, the contact KM4, and the contact KM5 are normally closed contacts.

[0010] Furthermore, the small relay includes a small relay KA1 and a small relay KA2, and the small relay KA1 and the small relay KA2 are connected to the frequency converter VFD through an interlocking circuit.

[0011] Furthermore, the protection module includes a braking resistor BR, a limit switch SQ1 and an indicator light HL1. The braking resistor BR is connected in series to the power bus of the inverter VFD. The limit switch SQ1 is connected in series to a small relay KA1. The indicator light HL1 is connected to the output terminal of the inverter VFD.

[0012] Furthermore, the control buttons include a start button SB1 and a stop button SB2, and the start button SB1 and the stop button SB2 perform overall control over the start and stop of the control device.

[0013] Furthermore, the remote controller sends a control signal to move and control the motor module.

[0014] Furthermore, the trolley running motor includes a trolley running motor M3 and a trolley running motor M4, and the trolley running motor M3 and the trolley running motor M4 are connected in parallel to drive the trolley.

[0015] A method for controlling a crane hook is provided. The method is implemented based on the above-mentioned crane hook control device. The method for controlling a crane hook comprises the following steps: S1, the control module sends a start signal to the power module, and the power module turns on the circuit to prepare for the operation of the motor module; S2, the control module sends a movement signal to the trolley running motor M2 and the carriage running motor. The trolley running motor M2 controls the trolley running to realize the lateral movement of the hook, and the carriage running motor controls the carriage running to realize the longitudinal movement of the hook; S3, the control module sends a lifting signal to the frequency converter VFD, and realizes the lifting and lowering action of the hook by controlling the opening and closing of the small relay.

[0016] Before operating the crane hook for lifting, you must first ensure that the power circuit breaker QF1 is in the closed state, and then activate the main contact KM1 of the power AC contactor through the start button SB1 on the remote control to make it attract and self-lock, thereby providing power preparation for the operation control of the hook and the trolley and carriage.

[0017] When performing the ascending action control, the operator issues a command through the ascending button on the remote control, triggering the small relay KA1 to pull in and close its normally open contacts. After the inverter VFD receives the forward start command, it drives the hook to ascend at the preset frequency. Once the ascending button is released, KA1 loses power and disconnects, and the inverter quickly reduces the frequency to 0Hz, stopping the motor. To prevent misoperation, the normally closed contacts of the small relay KA2 in the descending control circuit are connected in series in the KA1 circuit to form an interlock.

[0018] When performing the descending control, the operator presses the descending button on the remote control to close the small relay KA2, connect the reverse start command of the frequency converter VFD, and the hook descends at the preset frequency. After releasing the descending button, KA2 loses power, the frequency converter VFD stops quickly, and the motor stops running. The normally closed contact of the relay KA1 in the ascending control circuit is connected in series in the KA2 circuit to achieve interlocking and avoid operating errors.

[0019] In the inverter's rising and falling start circuits, the normally closed contacts of the rising flameout limiter and the rising double protection limiter limit switch SQ1, as well as the normally closed contacts of the falling flameout limiter are connected in series. These limiters cut off the inverter VFD's start command when the hook reaches the limit position, achieving rapid shutdown and ensuring that the hook will not damage the transmission machinery or cause safety accidents due to over-positioning.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention discloses a crane hook control device, which realizes the control of the crane hook through a frequency converter, and significantly improves the shortcomings of the traditional AC contactor control method. The application of the frequency converter makes the lifting and lowering control of the hook more precise, and effectively solves the problems of long response time and large lifting distance of the hook under the control of the AC contactor, thereby improving the work efficiency. In addition, the soft start characteristic of the frequency converter ensures the smoothness of the hook lifting process, eliminates the impact during starting and stopping, and shortens the operation time. When starting, the frequency converter can quickly open the brake pads, and when braking, it can quickly cut off the power to realize the brake brake, which effectively prevents the hook slipping phenomenon that may occur during heavy load operation, and ensures the safety and reliability of operation.

[0021] The present invention provides a method for controlling a crane hook, which realizes precise control of the hook by using the above-mentioned crane hook control device. Through the control signal sent by the remote controller, the relay in the control loop module can accurately control the start and stop of the frequency converter, thereby adjusting the speed of the hook lifting motor. This method not only improves the simplicity and flexibility of operation, but also ensures that the hook operates within a preset safety range through the use of a protective limiter, preventing over-positioning and potential mechanical damage. In addition, the implementation of this method also helps to reduce safety accidents caused by improper operation and improves the safety of the entire lifting operation. Through this method, the control of the crane hook becomes more intelligent and automated, meeting the needs of modern industrial production for efficient, precise and safe control. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The figure is a schematic diagram of the overall structure of a crane hook control device in an embodiment of the present invention.

[0023] Figure 2 The figure is a schematic diagram of electrical connections of a crane hook control device in an embodiment of the present invention.

[0024] Figure 3 It is a schematic diagram of a method for controlling a crane hook in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0029] Embodiment 1: like Figure 1 The figure shows a schematic diagram of the overall structure of a crane hook control device provided in a specific embodiment of the present invention, wherein the crane hook control device comprises: A power module inputs power through a circuit breaker QF1, and the circuit breaker QF1 is connected to a fuse FU1 and a fuse FU2; The motor module includes a hook lifting motor M1, a trolley running motor M2 and a carriage running motor, wherein the hook lifting motor M1 is connected between the fuse FU1 and the fuse FU2, and the trolley running motor M2 and the carriage running motor are connected in parallel with the hook lifting motor M1 after the fuse FU2; The inverter module includes an inverter VFD, several small relays, and an inverter protection module. The inverter VFD is connected to the hook lifting motor M1, and the small relays and inverter protection module are installed on the inverter VFD; The control module includes a control button and a remote controller. The control module is connected to the power module through a control transformer TC. The control button is the main switch of the control device, and the remote controller sends a control signal.

[0030] Preferably, the circuit module in this embodiment also includes a plurality of contacts, which are distributed on the lines connecting the hook lifting motor M1, the trolley running motor M2 and the carriage running motor with the power module.

[0031] Preferably, the contacts in this embodiment include: Contact KM1, main contact of power supply AC contactor, is located between fuse FU1 and hook lifting motor M1; Contact KM2 and contact KM3 are the main contacts of the trolley running north-south control AC contactor, located between the trolley running motor M2 and the fuse FU2; Contacts KM4 and KM5, the main contacts of the AC contactor for controlling the east and west movement of the trolley, are located between the trolley running motor and fuse FU2.

[0032] Preferably, in this embodiment, the contact KM1 is a normally open contact, and the contact KM2, the contact KM3, the contact KM4, and the contact KM5 are normally closed contacts.

[0033] Preferably, the small relay in this embodiment includes a small relay KA1 and a small relay KA2, and the small relay KA1 and the small relay KA2 are connected to the frequency converter VFD through an interlocking circuit.

[0034] Preferably, the protection module in this embodiment includes a braking resistor BR, a limit switch SQ1 and an indicator light HL1, the braking resistor BR is connected in series to the power bus of the inverter VFD, the limit switch SQ1 is connected in series with a small relay KA1, and the indicator light HL1 is connected to the output terminal of the inverter VFD.

[0035] Preferably, the control buttons in this embodiment include a start button SB1 and a stop button SB2, and the start button SB1 and the stop button SB2 perform overall control over the start and stop of the control device.

[0036] Preferably, the remote controller in this embodiment sends a control signal to move and control the motor module.

[0037] Preferably, the trolley running motor in this embodiment includes a trolley running motor M3 and a trolley running motor M4, and the trolley running motor M3 and the trolley running motor M4 are connected in parallel to drive the trolley.

[0038] like Figure 2 The figure shows an electrical connection schematic diagram of a crane hook control device described in this specific embodiment. The main power supply of the electrical control circuit of the crane hook control device is supplied by a three-phase sliding line power supply to the front end of the power circuit breaker QF1 of the control panel. A fuse FU1 and a power AC contactor are connected in series behind the circuit breaker QF1. The main contact of the power AC contactor is the contact KM1. After the contact KM1 is energized, the three-phase circuit supplies power to the main circuit power supply of the hook lifting control, the main circuit power supply of the trolley operation control, and the main circuit power supply of the trolley operation control through the phase lines L21, L22, and L23 shown in the figure. The control circuit power supply is supplied to the control transformer TC by the phase lines L21 and L22 drawn out after the contact KM1 is energized, and 36V AC is provided to power the control circuit after voltage reduction. The 36V AC voltage supplies power to the receiver of the remote controller and the small relays KA1 and KA2 of the control circuit. After the small relay KA1 is energized, the normally open contact of the small relay KA1 in series in the rising circuit of the frequency converter VFD is closed, and the frequency converter VFD obtains the start command and starts to rise. After the small relay KA2 coil is energized, the normally open contact of the small relay KA2 in series in the falling circuit of the frequency converter VFD is closed, and the frequency converter VFD obtains the start command and starts to descend. The normally closed contact of the upper flameout limiter and the normally closed contact of the double protection rising limiter are also connected in series in the rising circuit of the frequency converter VFD, and the normally closed contact of the lower flameout limiter is connected in series in the descending circuit. When the lifting hook touches the flameout limiter and the rising double protection limiter, its normally closed contact is disconnected, the frequency converter VFD loses power, and the motor stops running, which plays a protective role. The normally closed contacts of the small relay KA1 and the small relay KA2 are interlocking contacts for lifting control, which prevent the lifting control relays from being energized at the same time to cause a short circuit. The indicator light HL1 is also connected to the inverter VFD. The purpose is that after the inverter VFD is powered on and ready, the normally open contacts between T / A and T / C inside the inverter VFD are closed, and the indicator light HL1 lights up to remind the operator that the lifting and lowering operations can be performed. The brake resistor BR consumes the regenerative energy of the motor in the form of heat energy during the parking brake process to prevent the inverter VFD DC bus voltage from being too high and alarming.

[0039] Embodiment 2: like Figure 2The flowchart of a method for controlling a crane hook in an embodiment of the present invention is shown. The method for controlling a crane hook is implemented based on a crane hook control device described in Embodiment 1, and the method for controlling a crane hook includes the following steps: S1, the control module sends a start signal to the power module, and the power module turns on the circuit to prepare for the operation of the motor module; S2, the control module sends a movement signal to the trolley running motor M2 and the carriage running motor. The trolley running motor M2 controls the trolley running to realize the lateral movement of the hook, and the carriage running motor controls the carriage running to realize the longitudinal movement of the hook; S3, the control module sends a lifting signal to the frequency converter VFD, and realizes the lifting and lowering action of the hook by controlling the opening and closing of the small relay.

[0040] Before the hook lifting action is performed, the power circuit breaker QF1 must be closed first, and then the start button SB1 on the remote control must be pressed. The main contact KM1 coil of the power AC contactor will be attracted and self-locked, preparing for the hook lifting control, trolley operation control and truck operation control.

[0041] Hook rising action control: Press the up button on the remote control, the coil of the small relay KA1 is energized, and its normally open contacts are closed at the same time, connecting the forward start command of the inverter VFD. The hook rises according to the target frequency set by the inverter VFD, and the motor starts to run, driving the hook to move upward. Release the up button of the remote control, the coil of the small relay KA1 loses power, and the normally open contacts of the small relay KA1 connected in series in the rising start circuit of the inverter VFD are disconnected, cutting off the start command of the inverter VFD, and the frequency of the inverter quickly drops to 0Hz, and the motor stops rising. The coil circuit of the small relay KA1 for rising control is connected in series with the normally closed contacts of the small relay KA2 for descending circuit, forming an interlocking circuit to prevent short circuit caused by accidental operation of the descending button during the rising process.

[0042] Hook lowering action control: Press the lowering button on the remote control, the coil of the small relay KA2 is energized, and its normally open contacts are closed at the same time, connecting the reverse start command of the frequency converter VFD. The hook will then descend according to the target frequency set by the frequency converter VFD, and the motor will start to run, driving the hook downward. Release the lowering button on the remote control, the coil of the small relay KA2 will lose power, and the normally open contacts of the small relay KA2 connected in series in the lowering start circuit of the frequency converter VFD will be disconnected, cutting off the reverse start command of the frequency converter VFD. The frequency of the frequency converter VFD will drop quickly to 0Hz, and the motor will stop descending. The coil circuit of the small relay KA2 for the lowering control is connected in series with the normally closed contacts of the small relay KA1 for the rising circuit, forming an interlocking circuit to prevent short circuits caused by misoperation of the rising button during the lowering process.

[0043] Protection circuit in lifting control circuit: Since the normally closed contact of the rising flameout limiter and the normally closed contact of the rising double protection limiter are connected in series in the rising start command circuit of the inverter. In the forward (rising) circuit of the inverter, when the rising operation control is executed, after the double protection limiter limit switch SQ1 or the upper flameout limiter is encountered, the forward start command of the inverter VFD will be cut off immediately, the inverter VFD will stop quickly, and the motor will stop running immediately. Conversely, in the reverse (descending) control, the normally closed contact of the descending flameout limiter is connected in series in the descending start command circuit of the inverter VFD. In the reverse (descending) circuit of the inverter VFD, when the descending operation control is executed, after the lower flameout limiter is encountered, the reverse start command of the inverter VFD will be cut off immediately, the inverter will stop quickly, and the motor will stop running immediately. The connection of the above circuits prevents the hook from rising or descending and running too far and damaging the transmission machinery.

[0044] Embodiment 3: The present embodiment provides a use scenario of a crane hook control device and method described in one of the above embodiments. In the present embodiment, the above-mentioned crane hook control device is used to transform the existing 5T single-beam crane hook control device, and the original AC contactor control of the lifting and lowering control is transformed into a frequency converter control control system. The original lifting and lowering fire limiter and the rising double protection limiter no longer control the AC contactor coil to protect the motor from stopping immediately, but are transformed into a start and stop command source to control the frequency converter, so that the frequency converter stops working, and then disconnects the operation of the motor. The lifting control of the hook is interlocked through the small relay KA1 and the small relay KA2 to prevent short circuit caused by misoperation.

[0045] Preferably, in this embodiment, the AC contactor for the original lifting motor control is removed, and two small relays are controlled by the remote control, and then the small relay controls an 11KW vector inverter to control the operation of the 7.5KW lifting motor. During control, the lifting signal is sent by the remote control, and the coils of the small relays KA1 and KA2 are attracted, driving the corresponding normally open contacts to close, to connect the rising control command and the falling control command of the inverter. The frequency command is given by the inverter panel, and the speed of the motor is controlled by the frequency of the inverter. Since it is a inverter control modification, the planning and setting of several key functional parameters of the inverter are particularly important. A vector inverter is selected, so the inverter must be self-tuned before operation. The self-tuning of the inverter is achieved by setting F1-37=1, thereby establishing a mathematical model of the motor, improving the performance of the motor, reducing energy consumption and noise, and improving the efficiency of the motor. Since the voltage of the lifting motor is low at low speed, the magnetic flux is insufficient, the brake disc cannot be opened, and the motor is easily damaged. Therefore, the acceleration time should be short when starting, and the acceleration time parameter F0-17 is set to 2.3 seconds. When descending, the motor speed is high, and it is necessary to brake and stop quickly, otherwise it is easy to slip the hook. Therefore, the deceleration time parameter setting should also be short when stopping, and the deceleration time parameter F0-18 is set to 1.8 seconds. The lower limit frequency of the motor operation should be set as high as possible, and the lower limit frequency parameter F0-14 is set to 40Hz. If it is too low, the brake disc may not be opened and the motor bearing cover may be damaged. The motor itself is a power-off brake, and the stop mode should be set to free stop mode. Electrical deceleration and stopping are not required. Therefore, the parameter F6-10 of the stop mode is 1, and free stop is selected. The corresponding indicator light of the inverter is ready for power on, and F5-02 needs to be set to 15. The function control parameters such as the command source, frequency source, carrier frequency, preset frequency, overload protection, and temperature module protection of the inverter control also need to be accurately set.The specific settings of other relevant important parameters are as follows: F0-01=0, SVC control mode (open-loop vector control mode); F1-00=0, ordinary three-phase asynchronous motor; F1-01=motor rated power 7.5KW; F1-02=motor rated voltage 380V; F1-03=motor rated current 18A; F1-04=motor rated frequency 50Hz; F1-05=motor rated speed 1400rpm; F1-37=1, asynchronous motor static tuning; F0-02=1, terminal start and stop control; F0-03=1, digital setting of main frequency source X selection; F4-00=1, DI1 terminal selects forward operation; F4-01=52, DI2 terminal selects reverse operation; F0-17=2.5, acceleration time is 2.5 seconds; F0-18=2.0, deceleration time is 2.0 seconds; F0-10=50; maximum frequency is 50Hz; F0-12=45; upper limit frequency is 50Hz; F0-14=40; lower limit frequency is 40HZ; F0-08=35, preset frequency 40Hz; F8-13=0; reverse rotation is allowed; F6-10=1, free stop; F0-15=6.0, carrier frequency (if the noise is large, the carrier frequency can be increased); F9-00=1, inverter is ready, F5-02=15; motor overload protection is selected as allowed; F9-01=1.5, motor overload protection gain 18A*1.5(150%)=27A.

[0046] This embodiment transforms the existing AC contactor control system and adopts the inverter control technology to achieve accurate control of the lifting and lowering of the hook. This transformation can not only improve the accuracy of the hook control and reduce the error caused by excessive stroke, but also reduce the equipment failure rate through the soft start feature of the inverter, and improve the overall work efficiency and operation safety. Through this innovative technical solution, the problems existing in the prior art can be effectively solved. The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not intended to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A crane hook control device, characterized in that: The overhead crane hook control device comprises: A power module inputs power through a circuit breaker QF1, and the circuit breaker QF1 is connected to a fuse FU1 and a fuse FU2; The motor module includes a hook lifting motor M1, a trolley running motor M2 and a carriage running motor, wherein the hook lifting motor M1 is connected between the fuse FU1 and the fuse FU2, and the trolley running motor M2 and the carriage running motor are connected in parallel with the hook lifting motor M1 after the fuse FU2; The inverter module includes an inverter VFD, several small relays, and an inverter protection module. The inverter VFD is connected to the hook lifting motor M1, and the small relays and inverter protection module are installed on the inverter VFD; The control module includes a control button and a remote controller. The control module is connected to the power module through a control transformer TC. The control button is the main switch of the control device, and the remote controller sends a control signal.

2. A crane hook control device according to claim 1, characterized in that: The circuit module also includes a plurality of contacts, which are distributed on the circuits connecting the hook lifting motor M1, the trolley running motor M2 and the carriage running motor with the power module.

3. A crane hook control device according to claim 2, characterized in that: The contacts include: Contact KM1, main contact of power supply AC contactor, is located between fuse FU1 and hook lifting motor M1; Contact KM2 and contact KM3 are the main contacts of the trolley running north-south control AC contactor, located between the trolley running motor M2 and the fuse FU2; Contacts KM4 and KM5, the main contacts of the AC contactor for controlling the east and west movement of the trolley, are located between the trolley running motor and fuse FU2.

4. A crane hook control device according to claim 3, characterized in that: The contact KM1 is a normally open contact, and the contact KM2, the contact KM3, the contact KM4, and the contact KM5 are normally closed contacts.

5. The overhead crane hook control device according to claim 1, characterized in that: The small relays include a small relay KA1 and a small relay KA2, and the small relay KA1 and the small relay KA2 are connected to the frequency converter VFD through an interlocking circuit.

6. A crane hook control device according to claim 5, characterized in that: The protection module includes a braking resistor BR, a limit switch SQ1 and an indicator light HL1. The braking resistor BR is connected in series to the power bus of the frequency converter VFD. The limit switch SQ1 is connected in series to a small relay KA1. The indicator light HL1 is connected to the output terminal of the frequency converter VFD.

7. The overhead crane hook control device according to claim 1, characterized in that: The control buttons include a start button SB1 and a stop button SB2, and the start button SB1 and the stop button SB2 perform overall control on the start and stop of the control device.

8. The overhead crane hook control device according to claim 1, characterized in that: The remote controller sends a control signal to control the movement of the motor module.

9. The overhead crane hook control device according to claim 1, characterized in that: The trolley running motor includes a trolley running motor M3 and a trolley running motor M4, and the trolley running motor M3 and the trolley running motor M4 are connected in parallel to drive the trolley.

10. A method for controlling a crane hook, characterized in that: The control method is implemented based on a crane hook control device according to any one of claims 1 to 9, and the crane hook control method comprises the following steps: S1, the control module sends a start signal to the power module, and the power module turns on the circuit to prepare for the operation of the motor module; S2, the control module sends a movement signal to the trolley running motor M2 and the carriage running motor. The trolley running motor M2 controls the trolley running to realize the lateral movement of the hook, and the carriage running motor controls the carriage running to realize the longitudinal movement of the hook; S3, the control module sends a lifting signal to the frequency converter VFD, and realizes the lifting and lowering action of the hook by controlling the opening and closing of the small relay.

Images