Parking control timing device for rotating mechanism of gantry crane

Abstract

The utility model provides a parking control timing device for a rotating mechanism of a gantry crane, and belongs to the technical field of parking control. The parking control timing device for the rotating mechanism of the gantry crane comprises a pressure detection module, a parking control module, a first switch module, a control module, a timing module, a frequency conversion module and an alternating current motor, the pressure detection module and the parking control module are both connected with the first switch module, and the first switch module is connected with the control module; the control module is connected with the frequency conversion module, the control module is further connected with the frequency conversion module through the timing module, and the frequency conversion module is connected with the alternating current motor. The problem that the motor and the frequency converter break down due to the fact that the parking state is overtime in the prior art can be solved, and the safety of equipment is guaranteed.

Description

Technical Field

[0001] This disclosure relates to the field of parking control technology, and in particular to a parking control timing device for a gantry crane rotating mechanism. Background Technology

[0002] The braking of the rotating mechanism motor of the gantry crane currently uses a variable frequency and variable force brake. Its braking force includes variable frequency braking, which is provided by the AC motor actuator driven by the frequency converter, and the magnitude and time of braking torque can be controlled in a timely manner. Variable frequency braking includes two situations: (1) When the brake is unlocked, the variable force braking operation can be performed on the brake through the foot switch controller. (2) When parking is required, the "foot pedal / parking" knob is set to the "parking" position, and the brake will be in the maximum variable frequency braking state. However, according to the product manual, the "parking" state cannot exceed the value specified in the manual, otherwise it will greatly reduce the service life of the frequency converter and AC motor, or even burn out the motor and frequency converter. Therefore, a control and adjustment system is needed to protect the motor and frequency converter. Utility Model Content

[0003] This disclosure provides a parking control timing device for the rotating mechanism of a gantry crane to solve the problem in the prior art where the "parking" state timeout causes motor and frequency converter failures.

[0004] This disclosure provides a parking control timing device for a gantry crane's rotating mechanism, comprising:

[0005] Pressure detection module, parking control module, first switch module, control module, timing module, frequency converter module, AC motor;

[0006] The pressure detection module and the parking control module are both connected to the first switch module, and the first switch module is connected to the control module;

[0007] The control module is connected to the frequency converter module, and the control module is also connected to the frequency converter module through the timing module. The frequency converter module is connected to the AC motor.

[0008] In one exemplary embodiment of this disclosure, the parking control timing device for the gantry crane rotating mechanism further includes:

[0009] Parking selection module;

[0010] The parking selection module is connected to the timing module.

[0011] In one exemplary embodiment of this disclosure, the timing module includes a parking time relay and a parking relay;

[0012] The control terminal of the parking time relay is connected to the parking selection module, the normally closed terminal of the parking time relay is connected to the parking relay, and the parking relay is connected to the frequency converter module.

[0013] The normally open terminal of the parking time relay is connected to the frequency converter module.

[0014] In one exemplary embodiment of this disclosure, the parking control timing device for the gantry crane rotating mechanism further includes:

[0015] Left brake limit module, right brake limit module, left-hand locking relay, right-hand locking relay, left-hand locking contactor, right-hand locking contactor;

[0016] The control module is connected to the left brake limit module and the right brake limit module respectively. The left brake limit module is connected to the control terminal of the left-hand locking relay, and the right brake limit module is connected to the control terminal of the right-hand locking relay.

[0017] The normally open terminal of the left-hand locking relay is connected to the left-hand locking contactor, and the normally open terminal of the right-hand locking relay is connected to the right-hand locking contactor.

[0018] Both the left-hand locking contactor and the right-hand locking contactor are connected to the frequency converter module.

[0019] In one exemplary embodiment of this disclosure, the pressure detection module includes:

[0020] Pressure detection circuit, signal amplification circuit, and voltage regulation circuit;

[0021] The pressure detection circuit is connected to the signal amplification circuit, the signal amplification circuit is connected to the voltage regulator circuit, and the voltage regulator circuit is connected to the first switching module.

[0022] In one exemplary embodiment of this disclosure, the pressure detection circuit includes:

[0023] Varistor R1, resistor R2, resistor R6, and transistor Q1;

[0024] The first end of the varistor R1 is connected to the base of the transistor Q1. The second end of the varistor R1 is connected to the emitter of the transistor Q1 and the first end of the resistor R2. The first end of the resistor R2 is connected to VDD. The second end of the resistor R2 is also used to connect to the signal amplification circuit. The collector of the transistor Q1 is connected to the first end of the resistor R6. The second end of the resistor R6 is grounded.

[0025] In one exemplary embodiment of this disclosure, the signal amplification circuit includes:

[0026] Resistors R3, R4, R5, R7, R8, R9, variable resistor RP1, and amplifier U1;

[0027] The pressure detection unit is connected to the first end of the resistor R3, the second end of the resistor R3 is connected to the first end of the sliding rheostat RP1, the second end of the sliding rheostat RP1 is connected to GND through the resistor R4, the third end of the sliding rheostat RP1 is connected to the inverting input terminal of the amplifier U1 through the resistor R5, and the inverting input terminal of the amplifier U1 is also connected to the first end of the resistor R9.

[0028] The non-inverting input terminal of the amplifier U1 is connected to GND through resistor R7 and to the pressure detection unit through resistor R8. The output terminal of the amplifier U1 is connected to the second terminal of resistor R9 and the voltage regulator circuit.

[0029] The beneficial effects of the parking control timing device for the rotating mechanism of a gantry crane provided in this embodiment are as follows:

[0030] On the one hand, this embodiment can monitor the pressure of the foot switch in real time through the pressure detection module to avoid accidental triggering. On the other hand, combined with the control module and frequency converter module, the AC motor torque can be flexibly adjusted according to the actual situation such as the crane's rotation speed. For example, a large braking torque can be applied for rapid braking at high speeds, while the torque can be reduced at low speeds to achieve a smooth stop, effectively reducing impact, protecting the mechanical structure and surrounding facilities, and extending the service life of the equipment.

[0031] On the other hand, this embodiment adds a timing module, which can automatically cut off the "parking" state when the frequency converter reaches the preset time, effectively preventing equipment hazards caused by the gear being in "parking" for a long time. This can also improve the overall reliability and safety of the crane operation, reduce maintenance costs and downtime, and improve work efficiency. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a parking control timing device for a gantry crane rotating mechanism provided in an embodiment of this disclosure;

[0034] Figure 2This is a schematic diagram of the control section of the parking control timing device for the gantry crane rotating mechanism provided in this embodiment of the present disclosure;

[0035] Figure 3 This is a circuit diagram of the pressure detection module provided in an embodiment of this disclosure. Detailed Implementation

[0036] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0037] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0038] The implementation of this disclosure will be described in detail below with reference to the specific accompanying drawings:

[0039] Figure 1 This is a structural schematic diagram of a parking control timing device for a gantry crane's rotating mechanism, provided as an embodiment of this disclosure. (Refer to...) Figure 1 The timing device includes:

[0040] Pressure detection module, parking control module, first switch module, control module, timing module, frequency converter module, AC motor;

[0041] The pressure detection module and the parking control module are both connected to the first switch module, and the first switch module is connected to the control module.

[0042] The control module is connected to the frequency converter module, and the control module is also connected to the frequency converter module through the timing module. The frequency converter module is connected to the AC motor.

[0043] In this embodiment, the frequency converter module has two states: a locked state and an unlocked state. The frequency converter module can be a variable-power frequency converter. It enters the locked state when the frequency converter is not working and the unlocked state when the frequency converter is working. In this embodiment, the pressure detection module can include a pressure detection circuit, a signal amplification circuit, and a voltage regulator circuit. The pressure detection circuit can detect the pressure applied to the foot switch and convert the pressure signal into an electrical signal. For example, when the operator presses the foot switch, the pressure detection circuit will generate a corresponding electrical signal change according to the pressure magnitude. Since the electrical signal output by the pressure detection circuit is relatively weak, the signal amplification circuit can amplify it so that subsequent modules can more accurately identify and process it. For example, amplifying a weak signal at the millivolt level to the volt level. The voltage regulator circuit provides a stable power supply voltage for the pressure detection circuit and the signal amplification circuit, ensuring that fluctuations in the power supply voltage do not affect the accuracy of pressure detection during crane operation. Even if there are certain voltage fluctuations in the crane's power supply system, the voltage regulator circuit can ensure that the pressure detection module operates normally.

[0044] The parking control module can provide devices such as "park" status buttons and knobs, allowing operators to easily issue "park" commands to the system. When the operator presses the "park" button or rotates the "park" knob to the corresponding position, the parking control module sends a "park" signal to the first switch module, initiating the parking control process.

[0045] The first switch module can be a single-pole double-throw switch. On the one hand, it receives signals from the pressure detection module and the parking control module, and on the other hand, it transmits these signals to the control module, realizing signal transmission and interaction between different modules while avoiding mutual interference between signals.

[0046] The control module analyzes and processes the pressure signal and "park" signal from the first switching module. For example, upon receiving a pressure signal from the pressure detection module, the microcontroller in the control module determines whether the pressure exceeds a preset threshold, thus deciding whether to send a control signal to the frequency converter. Based on the signal analysis, corresponding control commands are generated and sent to the frequency converter module. When it is necessary to adjust the motor's torque, a suitable control signal is sent to the frequency converter to adjust the output of the AC motor actuator; when a "park" signal is received, the frequency converter is controlled to operate in the maximum frequency braking state, and the timing module is activated.

[0047] After receiving the start command from the control module, the timing module begins timing according to a preset time. For example, when the parking control module detects a "park" signal, the timing module starts timing to ensure that the "park" state is maintained for the set time. After the timing ends, the inverter disconnects the "park" state to prevent the equipment from overheating and burning out due to the gear remaining in the "park" state for an extended period.

[0048] In this embodiment, the variable frequency braking of the frequency converter includes two cases:

[0049] (1) When the inverter is in the unlocked state, when the pressure detection module detects that the pressure applied to the foot switch is greater than the preset threshold, the control module sends a control signal to the inverter. The inverter will adjust the output of the AC motor actuator according to the control signal, thereby driving the motor to generate braking torque. The magnitude and duration of this braking torque can be flexibly adjusted as needed. For example, when the crane rotates at a high speed, the inverter can make the AC motor actuator generate a large braking torque to quickly stop the rotation; while when the rotation speed is already very slow, the braking torque can be appropriately reduced to make the braking process smoother and avoid the impact caused by sudden stopping. (2) When the inverter is in the unlocked state, when the parking control module recognizes the "parking" signal, the control module controls the inverter to work in the maximum frequency conversion braking state and starts the timing module at the same time. When the timing ends, the "parking" state is automatically cut off, effectively preventing the inverter and AC motor from overheating and burning out due to the gear being in the "parking" state for a long time.

[0050] As can be seen from the above, on the one hand, this embodiment can monitor the pressure of the foot switch in real time through the pressure detection module to avoid false triggering. On the other hand, combined with the control module and the frequency converter module, the AC motor torque can be flexibly adjusted according to the actual situation such as the crane's rotation speed. For example, a large braking torque can be applied for rapid braking at high speeds, and the torque can be reduced at low speeds to achieve a smooth stop, effectively reducing impact, protecting the mechanical structure and surrounding facilities, and extending the service life of the equipment.

[0051] On the other hand, this embodiment adds a timing module, which can automatically cut off the "parking" state when the frequency converter reaches the preset time, effectively preventing equipment hazards caused by the gear being in "parking" for a long time. This can also improve the overall reliability and safety of the crane operation, reduce maintenance costs and downtime, and improve work efficiency.

[0052] In one embodiment of this disclosure, the parking control timing device for the gantry crane's rotating mechanism further includes:

[0053] Parking selection module;

[0054] The parking selection module is connected to the timer module.

[0055] In this embodiment, the parking selection module is a switch module. When the control module receives the "parking" control signal, it puts the parking selection module in a closed state. At this time, the timing module is powered on and starts timing. When the timing ends, the inverter can be put into the "released parking" state, reducing the probability of equipment failure.

[0056] In one exemplary embodiment of this disclosure, the timing module includes a parking time relay and a parking relay;

[0057] The control terminal of the parking time relay is connected to the parking selection module, the normally closed terminal of the parking time relay is connected to the parking relay, and the parking relay is connected to the frequency converter module.

[0058] The normally open terminal of the parking time relay is connected to the frequency converter module.

[0059] In this embodiment, after the parking selection module is closed, the parking time relay operates. When the normally closed terminal of the parking time relay is energized, the parking relay also begins to operate, and the inverter enters the maximum braking state. When the parking time relay finishes its timing, its normally closed terminal opens, the inverter exits the maximum braking state, and the inverter and motor are protected; the normally open terminal of the parking time relay closes, rendering the inverter input signal invalid.

[0060] In one embodiment of this disclosure, the parking control timing device for the gantry crane's rotating mechanism further includes:

[0061] Left brake limit module, right brake limit module, left-hand locking relay, right-hand locking relay, left-hand locking contactor, right-hand locking contactor;

[0062] The control module is connected to the left brake limit module and the right brake limit module respectively. The left brake limit module is connected to the control terminal of the left-hand locking relay, and the right brake limit module is connected to the control terminal of the right-hand locking relay.

[0063] The normally open terminal of the left-hand locking relay is connected to the left-hand locking contactor, and the normally open terminal of the right-hand locking relay is connected to the right-hand locking contactor.

[0064] Both the left-hand locking contactor and the right-hand locking contactor are connected to the frequency converter module.

[0065] In this embodiment, after the inverter's "park" state is released, the inverter remains in an unlocked state. To prevent the inverter from shaking unnecessarily and causing accidents, the control module needs to switch the inverter to a locked state to ensure equipment safety. The specific working principle is as follows:

[0066] The control module sends a signal to close the normally closed terminals of the left and right brake limit modules. At this time, the left and right locking relays are energized, and their normally open terminals close (by default, switch K7 is closed). The left and right locking contactors then begin operating, controlling the inverter and motor to enter the locked state. When the left and right brake limit modules reach their limits, their normally closed terminals open, indicating that the locking is complete, and the left and right locking relays disengage. Thus, the "parking" state has automatically switched to the locked state, protecting the inverter and motor.

[0067] In one embodiment of this disclosure, the pressure detection module includes:

[0068] Pressure detection circuit, signal amplification circuit, and voltage regulation circuit;

[0069] The pressure detection circuit is connected to the signal amplification circuit, the signal amplification circuit is connected to the voltage regulator circuit, and the voltage regulator circuit is connected to the first switching module.

[0070] The pressure detection circuit includes:

[0071] Varistor R1, resistor R2, resistor R6, and transistor Q1;

[0072] The first end of the varistor R1 is connected to the base of the transistor Q1. The second end of the varistor R1 is connected to the emitter of the transistor Q1 and the first end of the resistor R2. The first end of the resistor R2 is connected to VDD. The second end of the resistor R2 is also used to connect to the signal amplification circuit. The collector of the transistor Q1 is connected to the first end of the resistor R6. The second end of the resistor R6 is grounded.

[0073] The signal amplification circuit includes:

[0074] Resistors R3, R4, R5, R7, R8, R9, variable resistor RP1, and amplifier U1;

[0075] The pressure detection unit is connected to the first terminal of resistor R3. The second terminal of resistor R3 is connected to the first terminal of sliding rheostat RP1. The second terminal of sliding rheostat RP1 is connected to GND through resistor R4. The third terminal of sliding rheostat RP1 is connected to the inverting input terminal of amplifier U1 through resistor R5. The inverting input terminal of amplifier U1 is also connected to the first terminal of resistor R9.

[0076] The non-inverting input terminal of amplifier U1 is connected to GND through resistor R7 and to the pressure detection unit through resistor R8. The output terminal of amplifier U1 is connected to the second terminal of resistor R9 and the voltage regulator circuit.

[0077] In this embodiment, the working principle of the pressure detection circuit is as follows:

[0078] When pressure is applied to the pressure-sensitive resistor R1, its resistance changes. When there is no pressure or the pressure is low, the resistance of R1 is high, the base current of transistor Q1 is low, and Q1 is in the off state. When the pressure applied to the foot switch increases to a certain level, the resistance of R1 decreases, causing the base current of transistor Q1 to increase, and Q1 turns on. At this time, the current forms a loop through the emitter and collector of Q1 and resistor R6, generating a pressure-related voltage signal across resistor R6. This signal serves as the output of the pressure detection circuit and is transmitted to the signal amplification circuit.

[0079] The working principle of the signal amplifier circuit is as follows:

[0080] The voltage signal generated by the power supply VDD is applied to resistor R3, variable resistor RP1, and resistor R4. By adjusting the resistance of RP1, the voltage division ratio can be adjusted, thus changing the voltage signal input to the inverting input of amplifier U1. The non-inverting input of amplifier U1 is grounded through resistor R7 and receives another feedback signal from the pressure detection unit through resistor R8. These two signals are differentially amplified in amplifier U1, and the amplified signal is output from the output of amplifier U1, then passed through resistor R9 and transmitted to the voltage regulator circuit. By adjusting the resistance values ​​of resistors R3 to R9 and the resistance value of variable resistor RP1, the amplification factor of the amplifier can be flexibly adjusted, thereby amplifying the weak pressure signal at the millivolt level to the volt level.

[0081] The main function of the voltage regulator circuit is to stabilize the voltage and prevent the output voltage of the signal amplifier circuit from being too high, which could damage the control module.

[0082] As can be seen from the above, the pressure detection circuit can accurately detect changes in the pressure of the foot switch and convert them into electrical signals. After the electrical signal is input to the signal amplification circuit, the signal amplification circuit accurately amplifies the weak signal, enabling the signal to drive the transistor in the control module, thus improving the detection sensitivity and accuracy. The voltage regulation circuit ensures the stability of the output voltage, ensuring the safety of the control module and contributing to the stable and efficient operation of the equipment.

[0083] The above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit it. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A parking control timing device for the rotating mechanism of a gantry crane, characterized in that, include: Pressure detection module, parking control module, first switch module, control module, timing module, frequency converter module, AC motor; The pressure detection module and the parking control module are both connected to the first switch module, and the first switch module is connected to the control module; The control module is connected to the frequency converter module, and the control module is also connected to the frequency converter module through the timing module. The frequency converter module is connected to the AC motor.

2. The parking control timing device for the rotating mechanism of a gantry crane as described in claim 1, characterized in that, It also includes a parking selection module; The parking selection module is connected to the timing module.

3. The parking control timing device for the rotating mechanism of a gantry crane as described in claim 2, characterized in that, The timing module includes a parking time relay and a parking relay; The control terminal of the parking time relay is connected to the parking selection module, the normally closed terminal of the parking time relay is connected to the parking relay, and the parking relay is connected to the frequency converter module. The normally open terminal of the parking time relay is connected to the frequency converter module.

4. The parking control timing device for the rotating mechanism of a gantry crane as described in claim 1, characterized in that, Also includes: Left brake limit module, right brake limit module, left-hand locking relay, right-hand locking relay, left-hand locking contactor, right-hand locking contactor; The control module is connected to the left brake limit module and the right brake limit module respectively. The left brake limit module is connected to the control terminal of the left-hand locking relay, and the right brake limit module is connected to the control terminal of the right-hand locking relay. The normally open terminal of the left-hand locking relay is connected to the left-hand locking contactor, and the normally open terminal of the right-hand locking relay is connected to the right-hand locking contactor. Both the left-hand locking contactor and the right-hand locking contactor are connected to the frequency converter module.

5. The parking control timing device for the rotating mechanism of a gantry crane as described in claim 1, characterized in that, The pressure detection module includes: Pressure detection circuit, signal amplification circuit, and voltage regulation circuit; The pressure detection circuit is connected to the signal amplification circuit, the signal amplification circuit is connected to the voltage regulator circuit, and the voltage regulator circuit is connected to the first switching module.

6. The parking control timing device for the rotating mechanism of a gantry crane as described in claim 5, characterized in that, The pressure detection circuit includes: Varistor R1, resistor R2, resistor R6, and transistor Q1; The first end of the varistor R1 is connected to the base of the transistor Q1. The second end of the varistor R1 is connected to the emitter of the transistor Q1 and the first end of the resistor R2. The first end of the resistor R2 is connected to VDD. The second end of the resistor R2 is also used to connect to the signal amplification circuit. The collector of the transistor Q1 is connected to the first end of the resistor R6. The second end of the resistor R6 is grounded.

7. The parking control timing device for the rotating mechanism of a gantry crane as described in claim 5, characterized in that, The signal amplification circuit includes: Resistors R3, R4, R5, R7, R8, R9, variable resistor RP1, and amplifier U1; The pressure detection circuit is connected to the first terminal of resistor R3. The second terminal of resistor R3 is connected to the first terminal of the sliding rheostat RP1. The second terminal of the sliding rheostat RP1 is connected to GND through resistor R4. The third terminal of the sliding rheostat RP1 is connected to the inverting input terminal of amplifier U1 through resistor R5. The inverting input terminal of amplifier U1 is also connected to the first terminal of resistor R9. The non-inverting input terminal of the amplifier U1 is connected to GND through resistor R7 and to the pressure detection circuit through resistor R8. The output terminal of the amplifier U1 is connected to the second terminal of resistor R9 and the voltage regulator circuit.

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