Lifting equipment, driving device of lifting equipment and power supply circuit of driving device

Abstract

The utility model belongs to the technical field of platform safety protection, and particularly relates to lifting equipment, a driving device of the lifting equipment and a power supply circuit of the lifting equipment. The circuit comprises a switching power supply which is used for converting alternating current into direct current with different voltage levels so as to be respectively adaptive to a main driving device and a standby driving device; the first output end of the switching power supply is in power supply connection with a main driving circuit for driving the main driving device to lift; the second output end of the switching power supply and the output end of the standby power supply are both in power supply connection with a standby driving circuit used for driving the standby driving device to do lifting motion and a control circuit of the standby driving circuit, and one of the second output end of the switching power supply and the output end of the standby power supply is selected for output. When the standby driving device works, if the switching power supply cannot provide direct current needed by the standby driving device, reliable direct current is output through the standby power supply, and it is guaranteed that the standby driving device can work reliably.

Description

Technical Field

[0001] The utility model belongs to the technical field of platform safety protection, and in particular relates to a lifting device, a driving device of the lifting device and a power supply circuit thereof. Background Art

[0002] Initially, railway platforms were mostly open-style, and protective measures included arranging passenger service staff to patrol the platforms and setting up safety warning lines on the platforms to prevent accidents. However, these traditional methods obviously have great disadvantages, including that the passenger service staff is limited, and the patrol and monitoring range of each passenger service staff is limited, and it is impossible to ensure full-scale and full-time patrol and monitoring; even if many passengers see the safety warning line, they still choose to ignore the safety warning line and cross the safety warning line, resulting in accidents such as falling off the platform. Therefore, train platform safety management is particularly important, and certain means and measures are needed to prevent passengers from approaching the tracks.

[0003] The Chinese invention patent application with application publication number CN110745147A discloses a railway passenger platform lifting safety gate, which is provided with multiple groups of lifting columns (i.e., lifting equipment) on the existing railway passenger platform, and multiple protection belts are provided horizontally and parallelly between each group of lifting columns, and the lifting equipment is provided with fixed columns and a lifting frame installed on the fixed columns, and the lifting frame is driven by a motor to rise to a high position and fall to a low position. When passengers are waiting for the train, the safety gate descends to stop the passengers outside the safety line, and when the passengers need to board the train, the safety gate rises to allow the passengers to board the train. The power actuator of the safety gate is a servo motor (also called a main drive device). Once the servo motor fails to work normally due to a servo motor failure or other reasons, and the train usually stops at the platform for a short time at the midway point, if the protection belt is not raised during this period, the passengers cannot leave the station, which will be a serious accident.

[0004] In order to ensure the reliable operation of the safety door, it is possible to consider setting up a second set of actuators (i.e., backup drive devices) in the lifting equipment to serve as the actuator of the power system to enable the protection belt to rise when the servo motor fails. In order to drive and control the backup drive device, a common method is to supply power from a single power source. When there is a problem with the single power supply source, the backup drive device will not work reliably, and the entire lifting equipment will be unable to complete the intended function. Utility Model Content

[0005] The utility model aims to provide a lifting device, a driving device of the lifting device and a power supply circuit thereof, so as to solve the problem in the prior art that the lifting device cannot work reliably because the standby driving device adopts a single power supply mode.

[0006] In order to solve the above technical problems, the utility model provides a power supply circuit for a driving device of a lifting equipment, including a switching power supply for converting alternating current into direct current of different voltage levels to be respectively adapted to a main driving device and a backup driving device; a first output end of the switching power supply is powered and connected to a main driving circuit for driving the main driving device to perform lifting movements; a second output end of the switching power supply is unidirectionally powered and connected to a backup power supply, the second output end of the switching power supply and the output end of the backup power supply are both powered and connected to a backup driving circuit for driving the backup driving device to perform lifting movements and a control circuit of the backup driving circuit, and one of the second output end of the switching power supply and the output end of the backup power supply is selected for output.

[0007] Furthermore, the backup power supply is a power storage device.

[0008] Furthermore, the power storage device is a supercapacitor.

[0009] Furthermore, an interlocking relay is included, and the second output end of the switching power supply also supplies power to the coil connected to the interlocking relay, and the normally closed contacts of the interlocking relay are arranged in series on the output power supply line of the backup power supply.

[0010] Furthermore, the backup drive circuit includes an ascending main branch for driving the backup drive device to perform an ascending motion and a descending main branch for driving the backup drive device to perform a descending motion; the ascending main branch is provided in series with an interface for driving the connection to the backup drive device, and the ascending main branch upstream of the interface is connected in series with a first normally open contact of the ascending relay, and the ascending main branch downstream of the interface is connected in series with a second normally open contact of the ascending relay; the descending main branch is provided in series with an interface for driving the connection to the backup drive device, and the descending main branch upstream of the interface is connected in series with a first normally open contact of the descending relay, and the descending main branch downstream of the interface is connected in series with a second normally open contact of the descending relay.

[0011] Furthermore, the control circuit of the standby drive circuit includes a rising control branch and a falling control branch connected in parallel, which are connected in series with a main stop switch in a normally closed state after being connected in parallel; the rising control branch is provided with a rising control switch, a coil of an rising relay and a normally closed contact of a falling relay in series; the falling control branch is provided with a falling control switch, a coil of a falling relay and a normally closed contact of an rising relay in series; and the rising control switch is closed when the standby drive device is controlled to rise, the falling control switch is closed when the standby drive device is controlled to descend, and the main stop switch is opened when the standby drive device is controlled to stop.

[0012] Furthermore, the third normally open contacts of the rising relay are connected in parallel to both ends of the rising control switch, and the third normally open contacts of the falling relay are connected in parallel to both ends of the falling control switch.

[0013] Furthermore, a first anti-reverse diode is connected in series on the power supply line between the second output terminal of the switching power supply and the backup power supply.

[0014] Furthermore, a second anti-reverse diode is connected in series on the output power supply line of the backup power supply.

[0015] Furthermore, a third anti-reverse diode is serially connected on the power supply line between the second output terminal of the switching power supply and the standby driving circuit.

[0016] Furthermore, a normally closed upper limit switch is also arranged in series on the ascending main branch, and the upper limit switch is used to disconnect when the standby drive device rises to the upper limit position; a normally closed lower limit switch is also arranged in series on the descending main branch, and the lower limit switch is used to disconnect when the standby drive device descends to the lower limit position.

[0017] The beneficial effects are as follows: the power supply circuit of the utility model includes a switching power supply, which can convert the input AC power into DC power output of different voltage levels, specifically DC power adapted to the main drive device and DC power adapted to the backup drive device, which can provide power when the main drive device is working or when the backup drive device is working. A backup power supply is especially provided for the backup drive device, and the switching power supply supplies power to the backup power supply to ensure that the backup power supply is always in a powered state. When the backup drive device is working, if the switching power supply cannot effectively provide the DC power required by the backup drive device, reliable DC power is output through the backup power supply, which lays the foundation for the reliable operation of the backup drive device and improves the safety of the entire lifting equipment.

[0018] In order to solve the above technical problems, the utility model also provides a driving device for a lifting equipment, the power supply circuit of the driving device of the lifting equipment includes a switching power supply for converting alternating current into direct current of different voltage levels to adapt to the main driving device and the backup driving device respectively; the first output end of the switching power supply is powered by a main driving circuit connected to drive the main driving device to perform lifting movements; the second output end of the switching power supply is unidirectionally powered by a backup power supply, the second output end of the switching power supply and the output end of the backup power supply are both powered by a backup driving circuit for driving the backup driving device to perform lifting movements and a control circuit of the backup driving circuit, and one of the second output end of the switching power supply and the output end of the backup power supply is selected for output.

[0019] Furthermore, the backup power supply is a power storage device.

[0020] Furthermore, the power storage device is a supercapacitor.

[0021] Furthermore, an interlocking relay is included, and the second output end of the switching power supply also supplies power to the coil connected to the interlocking relay, and the normally closed contacts of the interlocking relay are arranged in series on the output power supply line of the backup power supply.

[0022] Furthermore, the backup drive circuit includes an ascending main branch for driving the backup drive device to perform an ascending motion and a descending main branch for driving the backup drive device to perform a descending motion; the ascending main branch is provided in series with an interface for driving the connection to the backup drive device, and the ascending main branch upstream of the interface is connected in series with a first normally open contact of the ascending relay, and the ascending main branch downstream of the interface is connected in series with a second normally open contact of the ascending relay; the descending main branch is provided in series with an interface for driving the connection to the backup drive device, and the descending main branch upstream of the interface is connected in series with a first normally open contact of the descending relay, and the descending main branch downstream of the interface is connected in series with a second normally open contact of the descending relay.

[0023] Furthermore, the control circuit of the standby drive circuit includes a rising control branch and a falling control branch connected in parallel, which are connected in series with a main stop switch in a normally closed state after being connected in parallel; the rising control branch is provided with a rising control switch, a coil of an rising relay and a normally closed contact of a falling relay in series; the falling control branch is provided with a falling control switch, a coil of a falling relay and a normally closed contact of an rising relay in series; and the rising control switch is closed when the standby drive device is controlled to rise, the falling control switch is closed when the standby drive device is controlled to descend, and the main stop switch is opened when the standby drive device is controlled to stop.

[0024] Furthermore, the third normally open contacts of the rising relay are connected in parallel to both ends of the rising control switch, and the third normally open contacts of the falling relay are connected in parallel to both ends of the falling control switch.

[0025] Furthermore, a first anti-reverse diode is connected in series on the power supply line between the second output terminal of the switching power supply and the backup power supply.

[0026] Furthermore, a second anti-reverse diode is connected in series on the output power supply line of the backup power supply.

[0027] Furthermore, a third anti-reverse diode is serially connected on the power supply line between the second output terminal of the switching power supply and the standby driving circuit.

[0028] Furthermore, a normally closed upper limit switch is also arranged in series on the ascending main branch, and the upper limit switch is used to disconnect when the standby drive device rises to the upper limit position; a normally closed lower limit switch is also arranged in series on the descending main branch, and the lower limit switch is used to disconnect when the standby drive device descends to the lower limit position.

[0029] The beneficial effects are as follows: the drive device of the utility model includes a main drive device and a backup drive device, and the power supply circuit of the entire drive device includes a switching power supply, which can convert the input AC power into DC power outputs of different voltage levels, specifically DC power adapted to the main drive device and DC power adapted to the backup drive device, which can provide power when the main drive device is working or when the backup drive device is working. A backup power supply is especially provided for the backup drive device, and the switching power supply supplies power to the backup power supply to ensure that the backup power supply is always in a powered state. When the backup drive device is working, if the switching power supply cannot provide the DC power required by the backup drive device, reliable DC power is output through the backup power supply, which lays the foundation for the reliable operation of the backup drive device and improves the safety of the entire lifting equipment.

[0030] In order to solve the above technical problems, the utility model also provides a lifting device, including a fixed column, a lifting frame installed on the fixed column, and a driving device for driving the lifting frame to a high position and a low position, the power supply circuit of the driving device includes a switching power supply for converting alternating current into direct current of different voltage levels to adapt to the main driving device and the backup driving device respectively; the first output end of the switching power supply is connected to the main driving circuit for driving the main driving device to perform lifting and lowering movements; the second output end of the switching power supply is unidirectionally connected to the backup power supply, the second output end of the switching power supply and the output end of the backup power supply are both connected to the backup driving circuit for driving the backup driving device to perform lifting and lowering movements and the control circuit of the backup driving circuit, and one of the second output end of the switching power supply and the output end of the backup power supply is selected for output.

[0031] Furthermore, the backup power supply is a power storage device.

[0032] Furthermore, the power storage device is a supercapacitor.

[0033] Furthermore, an interlocking relay is included, and the second output end of the switching power supply also supplies power to the coil connected to the interlocking relay, and the normally closed contacts of the interlocking relay are arranged in series on the output power supply line of the backup power supply.

[0034] Furthermore, the backup drive circuit includes an ascending main branch for driving the backup drive device to perform an ascending motion and a descending main branch for driving the backup drive device to perform a descending motion; the ascending main branch is provided in series with an interface for driving the connection to the backup drive device, and the ascending main branch upstream of the interface is connected in series with a first normally open contact of the ascending relay, and the ascending main branch downstream of the interface is connected in series with a second normally open contact of the ascending relay; the descending main branch is provided in series with an interface for driving the connection to the backup drive device, and the descending main branch upstream of the interface is connected in series with a first normally open contact of the descending relay, and the descending main branch downstream of the interface is connected in series with a second normally open contact of the descending relay.

[0035] Furthermore, the control circuit of the standby drive circuit includes a rising control branch and a falling control branch connected in parallel, which are connected in series with a main stop switch in a normally closed state after being connected in parallel; the rising control branch is provided with a rising control switch, a coil of an rising relay and a normally closed contact of a falling relay in series; the falling control branch is provided with a falling control switch, a coil of a falling relay and a normally closed contact of an rising relay in series; and the rising control switch is closed when the standby drive device is controlled to rise, the falling control switch is closed when the standby drive device is controlled to descend, and the main stop switch is opened when the standby drive device is controlled to stop.

[0036] Furthermore, the third normally open contacts of the rising relay are connected in parallel to both ends of the rising control switch, and the third normally open contacts of the falling relay are connected in parallel to both ends of the falling control switch.

[0037] Furthermore, a first anti-reverse diode is connected in series on the power supply line between the second output terminal of the switching power supply and the backup power supply.

[0038] Furthermore, a second anti-reverse diode is connected in series on the output power supply line of the backup power supply.

[0039] Furthermore, a third anti-reverse diode is serially connected on the power supply line between the second output terminal of the switching power supply and the standby driving circuit.

[0040] Furthermore, a normally closed upper limit switch is also arranged in series on the ascending main branch, and the upper limit switch is used to disconnect when the standby drive device rises to the upper limit position; a normally closed lower limit switch is also arranged in series on the descending main branch, and the lower limit switch is used to disconnect when the standby drive device descends to the lower limit position.

[0041] The beneficial effects are as follows: the lifting device of the utility model is provided with a main drive device and a backup drive device, and the backup drive device serves as a backup for the main drive device, especially when the main drive device cannot drive the lifting frame to rise, the backup drive device drives the lifting frame to rise, thereby ensuring the effective and reliable rise of the lifting frame and ensuring that passengers can exit the station safely. The power supply circuit of the entire drive device includes a switching power supply, which can convert the input AC power into DC power output of different voltage levels, specifically DC power adapted to the main drive device and DC power adapted to the backup drive device, which can provide power when the main drive device is working or when the backup drive device is working. A backup power supply is especially provided for the backup drive device, and the switching power supply supplies power to the backup power supply to ensure that the backup power supply is always in a powered state. When the backup drive device is working, if the switching power supply cannot provide the DC power required by the backup drive device, reliable DC power is output through the backup power supply, thereby laying a foundation for the reliable operation of the backup drive device and improving the safety of the entire lifting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a circuit diagram of a first embodiment of a power supply circuit of a driving device of a lifting device of the utility model;

[0043] Figure 2 It is a circuit diagram of a second embodiment of the power supply circuit of the driving device of the lifting equipment of the utility model. DETAILED DESCRIPTION

[0044] The key point of the utility model is that a power supply circuit is designed for the main drive device and the backup drive device in the lifting device. The power supply circuit includes a switching power supply, which can convert the input AC power into DC power of different voltage levels, and can power both the main drive device and the backup drive device. While ensuring the reliable operation of the main drive device, it can also ensure that the backup drive device is powered when the main drive device cannot work, so that the backup drive device has a reliable power supply, thereby being able to drive the lifting frame in the lifting device to rise. Moreover, considering the problem of unreliable power supply of a single power supply, a backup power supply is also provided in the power supply circuit, and the switching power supply is used to power the backup power supply, so that the backup drive device has two power supply sources. When the switching power supply cannot power the backup drive device (that is, the voltage output by the switching power supply does not meet the requirements of the backup drive device), the backup power supply is used to power the backup drive device, ensuring that it can work reliably. In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0045] Lifting equipment embodiment:

[0046] In this embodiment, the lifting device includes a fixed column, a lifting frame installed on the fixed column, and a main driving device for driving the lifting frame to rise to a high position and lower to a low position. The detailed description of this part of the structure can be referred to the Chinese invention patent application with application publication number CN110745147A. In this embodiment, the lifting device also includes a backup drive device, which can be a drive device composed of a linear thrust device. The backup drive device is actually an emergency drive device. When the emergency drive device outputs a linear motion in the up and down directions, it can bring the lifting frame from a low position to a high position. In this way, when the main drive device fails and cannot operate normally to raise the lifting frame to a high position on time, the emergency drive device can take over the main drive device to bring the lifting frame to a high position to complete the action that should be achieved. Moreover, when the lifting frame is driven to rise by the main drive device, the emergency drive device will not interfere with or affect the rise of the lifting frame, thereby ensuring that the lifting frame rises normally when the main drive device works normally. Similarly, the emergency drive device can bring the lifting frame from a high position to a low position. In this way, when the main drive device fails and cannot operate normally to lower the lifting frame to a low position on time, the emergency drive device can take over the main drive device to bring the lifting frame to a low position to complete the action that should be achieved.

[0047] Among them, the main drive device can select a motor, that is, Figure 1 D1 in the figure; the linear thrust device can be an electric cylinder, an electric push rod, etc., and the electric cylinder and the electric push rod can generally be called an electric actuator. In this embodiment, the linear thrust device selects an electric cylinder, that is, Figure 1 Moreover, in this embodiment, the motor requires 48V DC power and the electric cylinder requires 24V DC power.

[0048] The power supply circuit of the driving device of the lifting equipment is as follows Figure 1 As shown, the entire power supply circuit includes a switching power supply, a backup power supply, a main drive circuit for driving the main drive device to perform lifting motion, a backup drive circuit for driving the backup drive device to perform lifting motion, and a control circuit for the backup drive circuit.

[0049] The switching power supply is used to convert the input 220V AC power into DC power of different voltage levels for output to adapt to the main drive device and the standby drive device respectively, which are the 48V DC power required by the motor D1 of the main drive device and the 24V DC power required by the electric cylinder D2 of the standby drive device, that is, the first output end of the switching power supply is connected to the main drive circuit, and the second output end is connected to the standby drive circuit and the control circuit of the standby drive circuit. In order to achieve reliable operation of the standby drive device, a standby power supply is also set for the standby drive device. In this embodiment, a super capacitor C is selected. The advantages of super capacitor C are many, including that it has a large number of charge and discharge times and can work in a low temperature environment. The second output end of the switching power supply is connected to the super capacitor C, so that the switching power supply can charge the super capacitor C. The switching power supply and the standby power supply select one output to supply power to the standby drive circuit and the control circuit of the standby drive circuit, and generally, both are output by the switching power supply, and when the switching power supply cannot provide the 24V voltage required by the standby drive device, it is provided by the super capacitor C.

[0050] The second output end of the switching power supply and the output end of the super capacitor C are both connected to the backup drive circuit. The backup drive circuit includes two branches, namely the rising main branch and the falling main branch. When the rising main branch is turned on, the electric cylinder D2 rises, and when the falling main branch is turned on, the electric cylinder D2 falls. The rising main branch is connected in series with an rising relay J. 上 The first normally open contact and the second normally open contact ( Figure 1 The two normally open contacts in the upper dotted box) are connected in series with a descending relay J on the descending main branch. 下 The first normally open contact and the second normally open contact ( Figure 1 The two normally open contacts in the lower dotted box). 上 Coil, rising control switch K 上 And the lowering relay J 下 The normally closed contact is connected in series with the rising control branch ( Figure 1 The branch is still powered by either the switching power supply or the super capacitor C, and the rising control switch K 上 There is a rising relay J in parallel at both ends 上 The third normally open contact of the lower relay J 下 Coil, descending control switch K 下 And rising relay J 上 The normally closed contact of the descending control branch is connected in series. The branch is still powered by either the switching power supply or the super capacitor C, and the descending control switch K 下 There is a drop relay J in parallel at both ends 下The third normally open contact of this part of the circuit is mainly used to achieve "self-locking" and "interlocking". The following takes the rising state as an example to explain "self-locking" and "interlocking". When controlling the electric cylinder to rise, the rising control switch K 上 When closed, the rising relay J 上 The coil is energized, and the relay J 上 The third normally open contact of is closed. At this time, even if the control switch K 上 Disconnect, it can also ensure the rising relay J 上 The coil is always energized to achieve "self-locking". At the same time, the rising relay J 上 The normally closed contact of the relay J is disconnected, ensuring that the lowering 下 The coil will not be energized, achieving "interlocking". Moreover, it should be noted that the electric cylinder in this embodiment has a self-power-off function when reaching the limit position. When the electric cylinder rises to the limit position, it will automatically disconnect the main branch of rising, and when the electric cylinder descends to the limit position, it will automatically disconnect the main branch of descending.

[0051] In addition, a total stop switch S is also provided in the control circuit of the standby drive circuit. 总 , the main stop switch S 总 It is in the normally closed state. When the standby drive device needs to be stopped at any time, press the main stop switch S 总 Change it to disconnected state.

[0052] In order to realize the selective power supply of the switching power supply and the super capacitor C to the electric cylinder, the power supply circuit also includes an interlock relay J1, the second output end of the switching power supply is connected in parallel with the coil of the interlock relay J1, and the normally closed contact of the interlock relay J1 is connected in series to the power supply line between the output end of the super capacitor C and the backup drive circuit. The basic working principle is that when the switching power supply can output DC power normally, the coil of the interlock relay J1 is energized, its normally closed contact is disconnected, and the super capacitor C will not output. That is, when the voltage output at the second output end of the switching power supply is lower than the relay pull-in voltage, the super capacitor C outputs the power supply.

[0053] Furthermore, in order to prevent current reverse flow and ensure reliable operation of the system, the second output end of the switching power supply is connected to the supercapacitor C through a first anti-reverse diode D1; a second anti-reverse diode D2 is arranged in series on the power supply line between the output end of the supercapacitor C and the standby drive circuit; and a third anti-reverse diode D3 is arranged in series on the power supply line between the second output end of the switching power supply and the standby drive circuit.

[0054] The working principle of the above circuit is: if the standby drive device works to drive the lifting frame to rise, and the switching power supply can output normally, the coil of the interlock relay J1 is energized, and the super capacitor C cannot output; if the rising control switch K 上 Pressed (ie, the rising control switch K上 closed), then the rising relay J 上 The first normally open contact and the second normally open contact of are closed, the electric cylinder D2 rises, and the rising relay J 上 The third normally open contact of the relay J is closed to make the rising 上 The coil of the relay is continuously energized, and the relay J 上 The normally closed contact of the relay J is disconnected to make the lower 下 The coil will not be energized to ensure safe operation. When the electric cylinder reaches the limit position, the main branch of the rise will be automatically disconnected; if the descending control switch K 下 Pressed (ie, the lowering control switch K 下 closed), then the lowering relay J 下 The first normally open contact and the second normally open contact of are closed, the electric cylinder D2 descends, and the descending relay J 下 The third normally open contact of the relay J is closed to make the lowering 下 The coil is continuously energized, and the relay J 下 The normally closed contact of the relay J is opened to make the rising 上 The coil will not be energized to ensure safe operation. When the electric cylinder descends to the limit position, the main branch of the descent will be automatically disconnected.

[0055] In this embodiment, the electric cylinder is an electric cylinder with a self-power-off function when reaching the limit position. If the backup drive device no longer has the self-power-off function when reaching the limit position, a limit switch can be set to realize the function of disconnecting the main drive circuit when reaching the limit position. Specifically, an upper limit switch M is set at the upper limit position of the backup drive device. 上 , the switch is in the normally closed state and is connected in series to the ascending main branch; a lower limit switch M is set at the lower limit position of the standby drive device 下 , the switch is also in the normally closed state and is connected in series to the descending main branch. The specific circuit is as follows Figure 2 The specific working principle is that when the standby drive device moves upward to the upper limit position, the upper limit switch M 上 The rising relay J 上 The coil is no longer energized, and the rising relay J 上 The first normally open contact and the second normally open contact of are disconnected, and the standby drive device stops moving upward; the lower limit micro switch M 下 The working principle is the same and will not be described here.

[0056] In summary, the switching power supply and the backup power supply provided in the power supply circuit can supply power through the backup power supply when the switching power supply cannot provide the power required by the backup drive device when the backup drive device needs to work, thereby ensuring the stable and reliable operation of the system. Moreover, the backup drive circuit and the control circuit of the backup drive circuit are mainly composed of relays, the circuit structure is simple, there is no complex circuit structure, the anti-interference ability of the entire circuit is strong, and the safety of the entire system is high.

[0057] Embodiment of the driving device of the lifting device:

[0058] The driving device of the lifting device of this embodiment includes a main driving device and a backup driving device. The backup driving device is used to drive the lifting frame in the lifting device to rise to a high position and fall to a low position. The backup driving device can be a driving device composed of a linear thrust device. The power supply circuit of the driving device is as follows: Figure 1 or Figure 2 The connection relationship, working principle and function of each part of the power supply circuit have been described in detail in the lifting equipment embodiment, and will not be repeated in this embodiment.

[0059] Embodiment of the power supply circuit of the driving device of the lifting equipment:

[0060] The power supply circuit of this embodiment has a circuit principle as follows: Figure 1 or Figure 2 The connection relationship, working principle and function of each circuit have been described in detail in the lifting equipment embodiment, and will not be repeated in this embodiment.

[0061] Specific implementation methods are given above, but the present invention is not limited to the described implementation methods. The basic idea of ​​the present invention is the above basic scheme. For ordinary technicians in this field, according to the teachings of the present invention, it does not require creative labor to design various deformed models, formulas, and parameters. Changes, modifications, substitutions, and variations of the implementation methods without departing from the principles and spirit of the present invention still fall within the scope of protection of the present invention.

Claims

1. A power supply circuit for a driving device of a lifting device, characterized in that: It includes a switching power supply for converting AC power into DC power of different voltage levels to be respectively adapted to the main drive device and the backup drive device; the first output end of the switching power supply is connected to the main drive circuit for driving the main drive device to perform lifting motion; The second output end of the switching power supply is unidirectionally powered and connected to the backup power supply. The second output end of the switching power supply and the output end of the backup power supply are both powered and connected to the backup drive circuit and the control circuit of the backup drive circuit for driving the backup drive device to perform lifting movements, and one of the second output end of the switching power supply and the output end of the backup power supply is selected for output.

2. The power supply circuit of the driving device of the lifting equipment according to claim 1, characterized in that: The backup power supply is a power storage device.

3. The power supply circuit of the driving device of the lifting equipment according to claim 2, characterized in that: The power storage device is a super capacitor.

4. The power supply circuit of the driving device of the lifting equipment according to claim 1, characterized in that: It also includes an interlock relay, the second output end of the switching power supply also supplies power to the coil of the interlock relay, and the normally closed contacts of the interlock relay are arranged in series on the output power supply line of the backup power supply.

5. The power supply circuit of the driving device of the lifting equipment according to claim 1, characterized in that: The standby driving circuit includes an ascending main branch for driving the standby driving device to perform ascending motion and a descending main branch for driving the standby driving device to perform descending motion; The rising main branch is provided with an interface for driving the standby drive device in series, and the rising main branch upstream of the interface is connected in series with a first normally open contact of the rising relay, and the rising main branch downstream of the interface is connected in series with a second normally open contact of the rising relay; The descending main branch is provided with an interface for driving and connecting a standby driving device in series, and the first normally open contact of the descending relay is connected in series on the descending main branch upstream of the interface, and the second normally open contact of the descending relay is connected in series on the descending main branch downstream of the interface.

6. The power supply circuit of the driving device of the lifting equipment according to claim 5, characterized in that: The control circuit of the standby drive circuit includes an ascending control branch and a descending control branch connected in parallel, which are connected in series with a main stop switch in a normally closed state after being connected in parallel; The rising control branch is serially provided with an rising control switch, a coil of an rising relay and a normally closed contact of a falling relay; The descending control branch is serially provided with a descending control switch, a coil of a descending relay and a normally closed contact of an ascending relay; When the standby driving device is controlled to rise, the rising control switch is closed; when the standby driving device is controlled to descend, the descending control switch is closed; when the standby driving device is controlled to stop, the total stop switch is opened.

7. The power supply circuit of the driving device of the lifting equipment according to claim 6, characterized in that: The third normally open contact of the rising relay is connected in parallel to both ends of the rising control switch, and the third normally open contact of the falling relay is connected in parallel to both ends of the falling control switch.

8. The power supply circuit of the driving device of the lifting equipment according to any one of claims 1 to 7, characterized in that: A first anti-reverse diode is serially connected on the power supply line between the second output terminal of the switching power supply and the standby power supply.

9. The power supply circuit of the driving device of the lifting equipment according to any one of claims 1 to 7, characterized in that: A second anti-reverse diode is connected in series on the output power supply line of the backup power supply.

10. The power supply circuit of the driving device of the lifting equipment according to any one of claims 1 to 7, characterized in that: A third anti-reverse diode is serially connected on the power supply line between the second output terminal of the switching power supply and the standby driving circuit.

11. The power supply circuit of the driving device of the lifting equipment according to claim 5, characterized in that: A normally closed upper limit switch is also provided in series on the ascending main branch, and the upper limit switch is used to disconnect when the standby drive device rises to the upper limit position; a normally closed lower limit switch is also provided in series on the descending main branch, and the lower limit switch is used to disconnect when the standby drive device descends to the lower limit position.

12. A driving device for a lifting device, characterized in that: The power supply circuit of the driving device of the lifting equipment is the power supply circuit of the driving device of the lifting equipment according to any one of claims 1 to 11.

13. A lifting device, comprising a fixed column, a lifting frame mounted on the fixed column, and a driving device for driving the lifting frame to a high position and to a low position, characterized in that: The driving device is the driving device of the lifting equipment according to claim 12.

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