Portal crane lifting device

Abstract

The utility model discloses a portal crane lifting device which comprises a fan, a contactor, a control circuit, a first intermediate relay, a second intermediate relay, a switch circuit and a temperature detection circuit, and the contact capacity of the second intermediate relay is larger than that of the first intermediate relay; the first intermediate relay and the second intermediate relay are electrically connected with the contactor and the switching circuit respectively, and the enabling end of the switching circuit is electrically connected with the control circuit; the temperature detection circuit detects the temperature of the first intermediate relay, converts the temperature into a corresponding voltage signal and transmits the voltage signal to the control circuit, and the control circuit triggers the switching circuit to act, disconnects the first intermediate relay and the contactor and connects the second intermediate relay and the contactor when the voltage signal is larger than a limit value. Therefore, the situation that the frequency converter stops running and enters a self-protection state due to the fact that the intermediate relay reports the overheating fault can be avoided, and normal running of the portal crane is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of door machines, in particular to a hoisting device for a door machine. Background Art

[0002] During the daily dynamic inspection process, it is found that the intermediate relay of the hoisting frequency converter of the door machine often reports an overheat fault, which seriously affects the safe production of the door machine, resulting in the delay of the production plan. Inspection reveals that the intermediate relay of the fan on the power supply board is damaged, so the fan in the frequency converter does not rotate, resulting in the intermediate relay reporting an overheat fault, causing the frequency converter to stop running and enter the self-protection state. When the frequency converter reports an overheat fault of the intermediate relay, in severe cases, it can directly cause damage to the frequency converter, and the maintenance cost will increase significantly. Content of the Utility Model

[0003] Aiming at the above deficiencies, the technical problem to be solved by the utility model is: to provide a hoisting device for a door machine, which can avoid the situation that the frequency converter stops running and enters the self-protection state due to the overheat fault reported by the intermediate relay, and ensure the normal operation of the door machine.

[0004] To solve the above technical problem, the technical solution of the utility model is:

[0005] A hoisting device for a door machine includes a fan, a contactor electrically connected to the fan, and a control circuit, and further includes a first intermediate relay, a second intermediate relay, a switching circuit, and a temperature detection circuit, and the contact capacity of the contacts of the second intermediate relay is greater than that of the first intermediate relay; one end of the first intermediate relay is electrically connected to the control circuit, and the other end of the first intermediate relay is electrically connected to the contactor through the switching circuit; one end of the second intermediate relay is electrically connected to the control circuit, and the other end of the second intermediate relay is electrically connected to the contactor through the switching circuit; the enable end of the switching circuit is electrically connected to the control circuit; the temperature detection circuit is used to detect the temperature of the first intermediate relay and convert it into a corresponding voltage signal and transmit it to the control circuit. When the voltage signal is greater than the limit value, the control circuit triggers the switching circuit to act, disconnects the first intermediate relay and the contactor, and simultaneously conducts the second intermediate relay and the contactor.

[0006] Preferably, the temperature sensor includes a first temperature sensor for detecting the temperature of the first intermediate relay.

[0007] Preferably, the temperature sensor further includes a second temperature sensor for detecting the temperature of the second intermediate relay;

[0008] The device further includes an alarm circuit, which is electrically connected to the control circuit, and the control circuit controls the alarm circuit according to the temperature detected by the second temperature sensor.

[0009] Preferably, the contact capacity of the first intermediate relay is 10A, and the contact capacity of the second intermediate relay is 16A.

[0010] Preferably, the switch circuit is an analog switch.

[0011] Preferably, it further includes a hoisting motor and an inverter electrically connected to the hoisting motor, and the inverter is electrically connected to the control circuit.

[0012] After adopting the above technical solution, the beneficial effects of the present utility model are as follows:

[0013] Since the door machine hoisting device of the present utility model includes a fan, a contactor electrically connected to the fan, and a control circuit, it also includes a first intermediate relay, a second intermediate relay, a switch circuit, and a temperature detection circuit, and the contact capacity of the second intermediate relay is greater than that of the first intermediate relay; one end of the first intermediate relay is electrically connected to the control circuit, and the other end of the first intermediate relay is electrically connected to the contactor through the switch circuit; one end of the second intermediate relay is electrically connected to the control circuit, and the other end of the second intermediate relay is electrically connected to the contactor through the switch circuit; the enable end of the switch circuit is electrically connected to the control circuit; the temperature detection circuit is used to detect the temperature of the first intermediate relay and convert it into a corresponding voltage signal and transmit it to the control circuit. When the voltage signal is greater than the limit value, the control circuit triggers the switch circuit to act, disconnects the first intermediate relay and the contactor, and simultaneously conducts the second intermediate relay and the contactor. It can be seen that the present utility model avoids the situation that the inverter stops running and enters the self-protection state due to the overheat fault of the intermediate relay by real-time monitoring the temperature of the first intermediate relay, and switches to the intermediate relay with a larger contact capacity by the switch circuit when the temperature is relatively high, ensuring the normal operation of the door machine. Description of the Drawings

[0014] Figure 1 is a schematic block diagram of the door machine hoisting device in the present utility model. Detailed Embodiment

[0015] In order to make the purpose, technical solution and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0016] It should be noted that in the description of the present utility model, the terms indicating directions or positional relationships such as "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0017] In addition, it should be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it 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 an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0018] As Figure 1 shown, a door machine hoisting device includes a fan, a contactor electrically connected to the fan, a control circuit, a first intermediate relay, a second intermediate relay, a switching circuit, and a temperature detection circuit, and the contact capacity of the second intermediate relay is greater than that of the first intermediate relay; it also includes a hoisting motor and an inverter electrically connected to the hoisting motor, wherein the inverter is electrically connected to the control circuit. The control circuit can be, but is not limited to, an STM32 series single-chip microcomputer.

[0019] Among them, one end of the first intermediate relay is electrically connected to the control circuit, and the other end of the first intermediate relay is electrically connected to the contactor through the switching circuit; in this embodiment, the contact capacity of the first intermediate relay is 10A, and the electromagnetic coil of the first intermediate relay can be electrically connected to the control circuit.

[0020] Among them, one end of the second intermediate relay is electrically connected to the control circuit, and the other end of the second intermediate relay is electrically connected to the contactor through the switching circuit; in this embodiment, the contact capacity of the second intermediate relay is 16A, and the electromagnetic coil of the second intermediate relay can be electrically connected to the control circuit.

[0021] Among them, the enable end of the switching circuit is electrically connected to the control circuit. The switching circuit can be, but is not limited to, an analog switch, or can also be a switching circuit composed of triodes as long as it can switch between the first intermediate relay and the second intermediate relay.

[0022] The temperature detection circuit is used to detect the temperature of the first intermediate relay, convert it into a corresponding voltage signal and transmit it to the control circuit. When the voltage signal is greater than the limit value, the control circuit triggers the switch circuit to act, disconnect the first intermediate relay and the contactor, and at the same time conduct the second intermediate relay and the contactor. In this embodiment, the temperature sensor includes a first temperature sensor, and the first temperature sensor is used to detect the temperature of the first intermediate relay.

[0023] In a preferred solution, the temperature sensor further includes a second temperature sensor, and the second temperature sensor is used to detect the temperature of the second intermediate relay; at the same time, the present utility model further includes an alarm circuit, and the alarm circuit is electrically connected to the control circuit. The control circuit controls the alarm circuit according to the temperature detected by the second temperature sensor, and the alarm circuit can be an audible and visual alarm circuit.

[0024] As Figure 1 shown, when the door machine lifting device of the present utility model is working, under normal circumstances, specifically when the temperature of the first intermediate relay is not high, the switch circuit conducts the first intermediate relay and the contactor, that is, the first intermediate relay controls the fan switch. The control circuit controls the frequency converter to work, controls the normal operation of the lifting circuit, and the door machine works normally.

[0025] When the first temperature sensor detects the temperature of the first intermediate relay in real time, when the corresponding voltage signal is greater than the limit value, the control circuit triggers the switch circuit to act, makes it disconnect the first intermediate relay and the contactor, and conduct the second intermediate relay and the contactor, that is, switches to the second intermediate relay with a larger contact capacity to work, thus solving the situation that the first intermediate relay stops running due to overheat failure and enters the self-protection state, and further ensuring the normal operation of the door machine and avoiding the situation of damage to the frequency converter.

[0026] When the second temperature sensor detects that the temperature of the second intermediate relay is too high, indicating that a failure is likely to occur during continued operation, the control circuit triggers the alarm circuit to give a warning to improve the reliability of the door machine operation.

[0027] The above is only the preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modification, equivalent improvement of a door machine lifting device, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A door machine hoisting device, comprising a fan, a contactor electrically connected to the fan, and a control circuit, characterized in that, It also includes a first intermediate relay, a second intermediate relay, a switch circuit, and a temperature detection circuit, and the contact capacity of the second intermediate relay is greater than that of the first intermediate relay; One end of the first intermediate relay is electrically connected to the control circuit, and the other end of the first intermediate relay is electrically connected to the contactor through the switch circuit; One end of the second intermediate relay is electrically connected to the control circuit, and the other end of the second intermediate relay is electrically connected to the contactor through the switch circuit; The enable end of the switch circuit is electrically connected to the control circuit; The temperature detection circuit is used to detect the temperature of the first intermediate relay and convert it into a corresponding voltage signal and transmit it to the control circuit. When the voltage signal is greater than the limit value, the control circuit triggers the switch circuit to act, disconnect the first intermediate relay and the contactor, and at the same time conduct the second intermediate relay and the contactor.

2. The door machine hoisting device according to claim 1, characterized in that, The temperature detection circuit includes a first temperature sensor, and the first temperature sensor is used to detect the temperature of the first intermediate relay.

3. The door machine hoisting device according to claim 2, characterized in that, The temperature sensor further includes a second temperature sensor, and the second temperature sensor is used to detect the temperature of the second intermediate relay; The device also includes an alarm circuit, the alarm circuit is electrically connected to the control circuit, and the control circuit controls the alarm circuit according to the temperature detected by the second temperature sensor.

4. The door machine hoisting device according to claim 1, characterized in that, The contact capacity of the first intermediate relay is 10A, and the contact capacity of the second intermediate relay is 16A.

5. The door machine hoisting device according to claim 1, characterized in that, The switch circuit is an analog switch.

6. The door machine hoisting device according to claim 1, characterized in that, It also includes a hoisting motor and a frequency converter electrically connected to the hoisting motor, and the frequency converter is electrically connected to the control circuit.

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