Lifting equipment control system and lifting equipment

Abstract

The present invention provides a lifting equipment control system and lifting equipment, which relate to the technical field of lifting equipment. The lifting equipment control system includes: a motor; a motor brake arranged on the motor; a release device connected to the motor brake, the release device is used to open the motor brake; an energy storage circuit; a switch circuit connected between the stator winding of the motor and the energy storage circuit, the switch circuit is used to connect the stator winding with the energy storage circuit when the lifting equipment is in a power-off state, so that the energy storage circuit stores the self-excitation electric energy of the motor. The technical solution provided by the present invention can slowly lower the lifting equipment to a lower position when the lifting equipment fails and is in a power-off state, which is convenient for maintenance personnel to repair and avoids the safety hazards caused by high-altitude maintenance.

Description

Technical Field

[0001] The present invention relates to the technical field of lifting equipment, and in particular to a lifting equipment control system and a lifting equipment. Background Art

[0002] Lifting equipment is a platform or semi-enclosed platform-type mechanical equipment or device that can carry people or goods up and down vertical passages. It has been widely used in construction, mine shafts, wind turbine towers and other fields.

[0003] As a mechatronic device, lifting equipment can be controlled by motors. If a mechanical or electrical fault suddenly occurs in the lifting equipment at high altitude, it will be trapped in the air and unable to rise or descend normally. In this way, maintenance personnel have to troubleshoot and repair the lifting equipment at high altitude, which is inconvenient to operate and will cause greater safety hazards. Summary of the invention

[0004] The present invention provides a lifting equipment control system and a lifting equipment, which are used to solve the problem in the prior art that the lifting equipment is trapped in the air, which makes fault inspection and repair inconvenient and causes great potential safety hazards.

[0005] The present invention provides a lifting equipment control system, comprising:

[0006] Motor;

[0007] A motor holding brake provided on the motor;

[0008] A release device connected to the motor brake, the release device being used to release the motor brake;

[0009] Energy storage circuit;

[0010] A switch circuit is connected between the stator winding of the motor and the energy storage circuit. The switch circuit is used to connect the stator winding to the energy storage circuit when the lifting device is in a power-off state, so that the energy storage circuit stores the self-excited electric energy of the motor.

[0011] According to a lifting equipment control system provided by the present invention, the switch circuit comprises a first contactor, and a normally closed contact of the first contactor is connected between the stator winding and the energy storage circuit;

[0012] The normally closed contact of the first contactor is closed when the lifting device is in a power-off state, and in the closed state, the stator winding is connected to the energy storage circuit.

[0013] According to a lifting equipment control system provided by the present invention, the switch circuit further includes a second contactor, and the second contactor includes a first normally open contact;

[0014] The first end of the first normally open contact is used to be connected to the driving end of the motor driver, and the second end is connected to the stator winding;

[0015] The first normally open contact is opened when the normally closed contact of the first contactor is closed, and is closed when the normally closed contact of the first contactor is opened;

[0016] The first normally open contact conducts the motor driver and the stator winding when closed.

[0017] According to a lifting equipment control system provided by the present invention, the first end of the normally open contact of the first contactor is connected to the power supply control end of the first normally open contact, and the second end is used to be connected to the power supply of the lifting equipment;

[0018] The normally open contact of the first contactor is used to control the first normally open contact to be opened when the lifting device is in a power-off state, and to control the first normally open contact to be closed when the lifting device is in a power-on state.

[0019] A lifting equipment control system according to the present invention also includes a controller and a first normally open switch;

[0020] The first normally open switch is connected between the power supply and the power supply control end of the normally open contact of the first contactor, and the power supply control end of the first normally open switch is connected to the first control end of the controller;

[0021] The controller is used to control the first normally open switch to close through the first control end in a power-on state, and the first normally open switch connects the power supply to the power supply control end of the normally open contact of the first contactor in a closed state.

[0022] According to a lifting equipment control system provided by the present invention, the second contactor further includes a second normally open contact;

[0023] The first end of the second normally open contact is connected to the power supply control end of the normally closed contact of the first contactor, and the second end is used to connect to the power supply of the lifting device;

[0024] The second normally open contact is used to control the normally closed contact of the first contactor to close when the lifting device is in a power-off state, and to control the normally closed contact of the first contactor to open when the lifting device is in a power-on state.

[0025] A lifting equipment control system according to the present invention further includes a controller and a second normally open switch;

[0026] The second normally open switch is connected between the power supply and the power supply control end of the second normally open contact, and the power supply control end of the second normally open switch is connected to the second control end of the controller;

[0027] The controller is used to control the second normally open switch to close through the second control end in a power-on state, and the second normally open switch connects the power supply to the power supply control end of the second normally open contact in a closed state.

[0028] According to a lifting equipment control system provided by the present invention, the first contactor includes three normally closed contacts, and the energy storage circuit is a delta-connected capacitor circuit;

[0029] The delta-connected capacitor circuit includes three delta-connected capacitors, and the three corner points of the delta-connected capacitor circuit are respectively connected to the three-phase connection terminals of the stator winding through a corresponding one of the normally closed contacts.

[0030] According to a lifting equipment control system provided by the present invention, the release device is a manual release device, and the manual release device is used to open the motor brake under the action of an external force.

[0031] The present invention also provides a lifting device, comprising:

[0032] Car;

[0033] The lifting equipment control system as described in any one of the above, wherein the lifting equipment control system is connected to the car, and the lifting equipment control system is used to control the lifting and lowering of the car.

[0034] The lifting equipment control system and lifting equipment provided by the present invention include a motor, a motor brake arranged on the motor, a release device connected to the motor brake, an energy storage circuit, and a switch circuit connected between the stator winding of the motor and the energy storage circuit; when the lifting equipment fails and is in a power-off state, the switch circuit connected between the stator winding of the motor and the energy storage circuit can conduct the stator winding with the energy storage circuit, at which time the motor brake can be opened by the release device, and the lifting equipment relies on its own weight to descend to do work, so that the motor works in a self-excited electrification state, and the energy storage circuit stores the self-excited electrification electric energy and provides it to the motor, so that the motor shaft is subjected to a reaction force, which can be converted into a reaction force when the lifting equipment descends, slowing down the speed of the lifting equipment's own weight descent, and the lifting equipment finally reaches a torque balance and then slowly descends. In this way, when the lifting equipment fails and is in a power-off state, the lifting equipment can be slowly lowered to a low place, which is convenient for maintenance personnel to overhaul and avoids the safety hazards caused by high-altitude maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 It is one of the structural schematic diagrams of the lifting equipment control system provided by the embodiment of the present invention;

[0037] Figure 2 This is the second structural diagram of the lifting equipment control system provided by the embodiment of the present invention;

[0038] Figure 3 This is the third structural diagram of the lifting equipment control system provided by the embodiment of the present invention;

[0039] Figure 4 This is the fourth structural diagram of the lifting equipment control system provided by the embodiment of the present invention;

[0040] Figure 5 This is the fifth structural diagram of the lifting equipment control system provided by the embodiment of the present invention;

[0041] Figure 6 It is a structural schematic diagram of a lifting device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0043] It should be noted that the serial numbers assigned to the components in the present invention, such as "first", "second", etc., are only used to distinguish the objects being described and do not have any order or technical meaning.

[0044] The lifting equipment control system provided in the embodiment of the present invention can be applied to lifting equipment, for example, it can be applied to lifting equipment in the fields of construction, mine shafts, wind turbine towers, etc., for controlling the lifting of the lifting equipment.

[0045] Figure 1 One of the structural diagrams of the lifting equipment control system provided by the embodiment of the present invention is exemplarily shown, referring to Figure 1As shown, the lifting equipment control system may include a motor 110, a motor brake 120 arranged on the motor 110, a release device 130 connected to the motor brake 120, an energy storage circuit 140, and a switch circuit 150 connected between the stator winding of the motor 110 and the energy storage circuit 140.

[0046] The motor brake 120 is an electromagnetic mechanical brake, which can lock the shaft of the motor 110 when the power supply is cut off, thereby completing the brake function.

[0047] The release device 130 is used to open the motor brake 120. Exemplarily, the release device 130 may be a manual release device, which can open the motor brake 120 under the action of an external force. For example, the manual release device may be a mechanical handle plugged into the motor brake 120, and when an external force acts on the mechanical handle, the motor brake can be opened by torque. For example, the manual release device may also be a mechanical transmission mechanism connected to the motor brake 120, such as a mechanical transmission mechanism based on a pull rope, and the motor brake 120 can be opened by manually operating the mechanical transmission mechanism.

[0048] Exemplarily, the release device 130 may also be an electronic release device, which may have a built-in battery to provide itself with electrical energy. The electronic release device may be provided with a release button, which opens the motor brake 120 when the button is triggered; alternatively, the electronic release device may also be configured with a remote control, which triggers the release function of the electronic release device to open the motor brake 120.

[0049] The switch circuit 150 is used to connect the stator winding of the motor 110 to the energy storage circuit 140 when the lifting device is in a power-off state, so that the energy storage circuit 140 stores the self-excitation electric energy of the motor 110. When the motor 110 is in a self-excitation state, the self-excitation electric energy acts on the motor 110 and can provide a reaction force on the rotating shaft of the motor 110.

[0050] Exemplarily, the switch circuit 150 can be a circuit formed based on a controllable switch, such as an electrical switch such as a relay or a contactor, or a circuit formed based on a unidirectional conductive device such as a diode or a transistor, or can be implemented through an integrated circuit. When the lifting device is in a power-off state, the switch circuit 150 disconnects the stator winding of the motor 110 from the energy storage circuit 140; when the lifting device is powered normally, the switch circuit 150 connects the stator winding of the motor 110 to the energy storage circuit 140. In this way, during the normal operation of the lifting device, that is, when the power supply is normal, the motor 110 and the energy storage circuit 140 are in a disconnected state, and the energy storage circuit 140 will not affect the operation of the motor 110.

[0051] The lifting equipment control system provided in this example embodiment includes a motor, a motor brake arranged on the motor, a release device connected to the motor brake, an energy storage circuit, and a switch circuit connected between the stator winding of the motor and the energy storage circuit; when the lifting equipment fails and is in a power-off state, the switch circuit connected between the stator winding of the motor and the energy storage circuit can conduct the stator winding with the energy storage circuit, at which time the motor brake can be opened by the release device, and the lifting equipment descends by its own weight to do work, so that the motor works in a self-excited electrification state, and the energy storage circuit stores the self-excited electrification energy and provides it to the motor, so that the motor shaft is subjected to a reaction force, which can be converted into a reaction force when the lifting equipment descends, slowing down the speed of the lifting equipment's own weight descent, and the lifting equipment slowly descends after finally reaching a torque balance under the action of the reaction force. In this way, when the lifting equipment fails and is in a power-off state, the lifting equipment can be slowly lowered to a lower place, which is convenient for maintenance personnel to overhaul and avoids the safety hazards caused by high-altitude overhaul.

[0052] based on Figure 1 In the lifting equipment control system of the corresponding embodiment, in an exemplary embodiment, the switch circuit 150 may be formed based on a contactor. Figure 2 The second structural diagram of the lifting equipment control system provided by the embodiment of the present invention is exemplarily shown. Figure 2 As shown, the switch circuit 150 may include a first contactor KM1, the normally closed contact of the first contactor KM1 being connected between the stator winding of the motor 110 and the energy storage circuit 140. The normally closed contact of the first contactor KM1 is closed when the lifting device is in a power-off state, and the stator winding of the motor 110 and the energy storage circuit 140 can be connected when the normally closed contact of the first contactor KM1 is in a closed state.

[0053] For example, in Figure 2In the example, the motor 110 is a brushless DC motor, and the three-phase terminals U1, V1 and W1 of the stator winding are respectively connected to the energy storage circuit 140 through the three normally closed contacts of the first contactor KM1, and the three-phase terminals U1, V1 and W1 are also used to connect to the brushless DC motor driver. In the power-on state, the motor 110 operates under the drive control of the brushless DC motor driver, the three normally closed contacts of the first contactor KM1 are opened, and the energy storage circuit 140 is disconnected from the motor 110, which does not affect the normal operation of the motor 110. When the lifting device fails, the external power supply is cut off, the motor 110 is locked by the motor brake 120, and the motor 110 stops running; in the power-off state, no current flows through the coil of the first contactor KM1, the three normally closed contacts of the first contactor KM1 are closed, and the energy storage circuit 140 is connected to the stator winding of the motor 110; at this time, after the motor brake 120 is opened by the release device 130, the lifting device descends by its own weight, driving the motor 110 to reverse, and the motor 110 and the energy storage circuit 140 can interact with each other to make the lifting device descend slowly.

[0054] The lifting equipment control system provided in this example embodiment forms a switch circuit through a first contactor, and can use the normally closed contact of the first contactor to control the on and off of the motor and the energy storage circuit. The system circuit has a simple structure and low cost.

[0055] based on Figure 2 In a corresponding embodiment of the lifting equipment control system, in an exemplary embodiment, Figure 3 The third structural diagram of the lifting equipment control system provided by the embodiment of the present invention is exemplarily shown. Figure 3 As shown, the switch circuit 150 may further include a second contactor KM2, and the second contactor KM2 may include a first normally open contact KM2-1, a first end of the first normally open contact KM2-1 is used to be connected to the driving end of the motor driver, and a second end is connected to the stator winding of the motor 110. The first normally open contact KM2-1 is opened when the normally closed contact of the first contactor KM1 is closed, and is closed when the normally closed contact of the first contactor KM2 is opened; when the first normally open contact KM2-1 is closed, the motor driver and the stator winding of the motor 110 are turned on.

[0056] For example, in Figure 3In the example, the motor 110 is a brushless DC motor, and the three-phase terminals U1, V1 and W1 of the stator winding are respectively connected to the driving terminals U2, V2 and W2 of the brushless DC motor driver through the three normally open contacts of the first normally open contact KM2-1. In the power-on state, the coil of the first normally open contact KM2-1 is in a state of current, and its three normally open contacts are closed, connecting the motor 110 and the brushless DC motor driver, and the motor 110 operates under the drive control of the brushless DC motor driver; at the same time, in the power-on state, the three normally closed contacts of the first contactor KM1 are opened, and the energy storage circuit 140 is disconnected from the motor 110, which does not affect the normal operation of the motor 110. When the lifting equipment fails, the external power supply is cut off, the motor 110 is locked by the motor brake 120, and the motor 110 stops running; in the power-off state, no current flows through the coils of the first contactor KM1 and the second contactor KM2, the three normally closed contacts of the first contactor KM1 are closed, and the three normally open contacts of the first normally open contact KM2-1 are opened, the energy storage circuit 140 is connected to the stator winding of the motor 110, and the motor 110 is disconnected from the DC brushless motor driver. At this time, after the motor brake 120 is opened by the release device 130, the lifting equipment descends by its own weight, driving the motor 110 to reverse, and the motor 110 and the energy storage circuit 140 can interact with each other to make the lifting equipment descend slowly.

[0057] The lifting equipment control system provided in this example embodiment utilizes a working mode in which the normally closed contact of the first contactor and the first normally open contact of the second contactor are in opposite on-off states to each other, thereby ensuring that the lifting equipment will not be affected by the energy storage circuit during normal operation, and that the self-excitation of the motor in the power-off state will not affect the motor driver, thereby improving the safety of the lifting equipment control system.

[0058] based on Figure 3 In the control system of the lifting device of the corresponding embodiment, in an optional implementation, the first contactor can control the closing and opening of the first normally open contact of the second contactor. For example, the first contactor KM1 can also include a normally open contact, the first end of which is connected to the power supply control end of the first normally open contact KM2-1, and the power supply control end is used to control whether to provide current to the coil of the first normally open contact KM2-1; the second end of the normally open contact of the first contactor KM1 is used to connect to the power supply of the lifting device. Among them, the normally open contact of the first contactor KM1 is used to control the first normally open contact KM2-1 of the second contactor to be disconnected when the lifting device is in a power-off state, and to control the first normally open contact KM2-1 of the second contactor to be closed when the lifting device is in a power-on state.

[0059] In this way, the first normally open contact of the second contactor is controlled by the first contactor, so that the first contactor and the second contactor are in an interlocked state, and automatic switching of functions can be achieved between normal operation and failure of the lifting equipment. The circuit structure is simple and easy to use.

[0060] Further optionally, a first normally open switch can be controlled by the controller, and the opening and closing of the normally open contact of the first contactor KM1 can be controlled by the on-off state of the first normally open switch, and then the on-off state of the first normally open contact of the first contactor KM1 can be controlled by the on-off state of the normally open contact of the first contactor KM2-1. In this way, the on-off state of the normally open contact of the first contactor KM1 and the first normally open contact KM2-1 of the second contactor can be uniformly controlled by the controller, so as to avoid confusion in the system control logic and improve the safety of the system.

[0061] Based on this, Figure 4 The fourth structural diagram of the lifting equipment control system provided by the embodiment of the present invention is exemplarily shown. Figure 4 As shown, the lifting equipment control system may also include a controller 160 and a first normally open switch K1, and the first contactor KM1 may include a normally closed contact KM1-1 and a normally open contact KM1-2. The first end of the normally open contact KM1-2 of the first contactor is connected to the power supply control terminal A1 of the first normally open contact KM2-1, and the power supply control terminal A1 is used to control whether to provide current to the coil of the first normally open contact KM2-1; the second end of the normally open contact KM1-2 of the first contactor is used to connect to the power supply of the lifting equipment. The first normally open switch K1 is connected between the power supply and the power supply control terminal A2 of the normally open contact KM1-2, and the power supply control terminal of the first normally open switch K1 is connected to the first control terminal G1 of the controller 160.

[0062] The controller 160 is used to control the first normally open switch K1 to close through the first control terminal G1 in the power-on state. The first normally open switch K1 can conduct the power supply to the power supply control terminal A2 of the normally open contact KM1-2 in the closed state. The third control terminal of the controller 160 is connected to the controlled end of the motor brake 120 (the connection is not shown in the figure). The controller 160 can also be used to control the opening and locking of the motor brake 120 in the power-on state. The motor brake 120 can lock the shaft of the motor 110 when the motor 110 is not enabled to prevent the shaft of the motor 110 from rotating accidentally.

[0063] Exemplarily, in an embodiment of the present invention, the energy storage circuit 140 can be a delta-connected capacitor circuit, which includes three delta-connected capacitors C1, C2 and C3, and the three corner contacts of the delta-connected capacitor circuits C1, C2 and C3 are respectively connected to the three-phase terminals U1, V1 and W1 of the stator winding of the motor 110 through a corresponding normally closed contact in the normally closed contact KM1-1.

[0064] For example, in Figure 4 In the embodiment, the lifting equipment control system may further include a motor driver 170, and the three-phase terminals U1, V1 and W1 of the motor 110 are correspondingly connected to the driving terminals U2, V2 and W2 of the motor driver 170. Accordingly, the controlled terminal of the motor driver 170 is connected to the fourth control terminal of the controller 160 (the connection is not shown in the figure), and the motor 110 can be driven and controlled under the control of the controller 160.

[0065] In the embodiment of the present invention, the motor 110 may be a brushless DC motor, and accordingly, the motor driver 170 is a brushless DC motor driver, which can control the speed, positioning, etc. of the brushless DC motor through a Hall sensor. The motor 110 may also be a servo motor, and accordingly, the motor driver 170 is a servo driver.

[0066] The following example takes the motor 110 as a brushless DC motor, the motor driver 170 as a brushless DC motor driver, and the energy storage circuit 140 as a delta capacitor circuit. Figure 4 The working principle of the lifting equipment control system shown is described.

[0067] according to Figure 4In the lifting equipment control system shown, when the lifting equipment is in normal operation, the power supply can supply power to the system normally, and the controller 160 controls the first normally open switch K1 to close through the first control terminal G1, and the coil of the first contactor KM1 is in a current state, and the normally open contact KM1-2 of the first contactor is closed, then the coil of the first normally open contact KM2-1 is in a current state, and the first normally open contact KM2-1 is closed. At this time, the DC brushless motor driver 170 can directly control the output torque and rotation speed of the DC brushless motor 110, and realize the lifting and lowering of the lifting equipment through the mechanical transmission mechanism of the lifting equipment. When rising, the power driven by the DC brushless motor 110 is greater than the power of the sum of the self-weight of the lifting equipment and the current load, and energy is obtained from the power supply; when descending, the power driven by the DC brushless motor 110 is less than the power of the sum of the self-weight of the lifting equipment and the current load, and the energy is consumed in the braking resistor or the feedback power supply. Power balance can be achieved during the rising and descending process. At the same time, when the coil of the first contactor KM1 is in a current-carrying state, the normally closed contact KM1-1 of the first contactor is disconnected, the delta-connected capacitor circuit 140 and the DC brushless motor 110 are in a disconnected state, and the delta-connected capacitor circuit 140 does not participate in the normal operation of the DC brushless motor 110 and will not affect the normal operation of the DC brushless motor 110.

[0068] When the lifting device is in a fault state, the power supply to the system is cut off. At this time, the first normally open switch K1 is disconnected, the controller 160 cannot control the coil of the first contactor KM1 to be in a state with current, the normally open contact KM1-2 of the first contactor is disconnected, the coil of the second contactor KM2 is in a state without current, the first normally open contact KM2-1 of the second contactor is in a disconnected state, and the DC brushless motor driver 170 and the DC brushless motor 110 are disconnected. When the coil of the first contactor KM1 is in a state without current, the normally closed contact KM1-1 of the first contactor is in a closed state, and the delta capacitor circuit 140 and the DC brushless motor 110 are turned on. After the motor brake 120 is opened by the release device 130, the lifting device begins to descend under the action of its own weight and the current load, and the gravity work during the descent is consumed in mechanical or electrical braking. At this time, since the power supply of the lifting device is cut off, the capacitor connected in a triangle on the stator winding side of the DC brushless motor 110 interacts with the DC brushless motor 110, so that the DC brushless motor 110 operates in a self-excited state. The capacitor can store the electric energy of self-excitation and provide it to the DC brushless motor 110, thereby generating a reaction force on the rotating shaft of the DC brushless motor 110, which can be converted into the reaction force of gravity when the lifting device descends. As the gravity of the lifting device and its current load does work, the lifting device will eventually reach a torque balance and slowly descend at a speed after the torque balance. The speed will be less than the rated operating speed of the lifting device and not greater than the maximum safety required speed.

[0069] In this way, when the lifting device fails and is in a power-off state, the lifting device can be slowly lowered to a lower position, which is convenient for maintenance personnel to inspect and repair, and avoids the potential safety hazards caused by high-altitude inspection and repair. Moreover, when the delta-connected capacitor circuit 140 and the DC brushless motor 110 interact with each other, the DC brushless motor driver 170 and the DC brushless motor 110 are disconnected through the first normally open contact KM2-1, so that the DC brushless motor 110 will not affect the DC brushless motor driver 170 when interacting with the delta-connected capacitor circuit 140, thereby improving the safety of the system.

[0070] based on Figure 3In an optional implementation of the lifting equipment control system of the corresponding embodiment, the closing and opening of the normally closed contact of the first contactor can also be controlled by the second contactor. For example, the second contactor KM2 can also include a second normally open contact, the first end of which is connected to the power supply control end of the normally closed contact of the first contactor KM1, and the power supply control end is used to control whether to provide current to the coil of the first contactor KM1; the second end of the second normally open contact is used to connect to the power supply of the lifting equipment. The second normally open contact is used to control the closing of the normally closed contact of the first contactor KM1 when the lifting equipment is in a power-off state, and to control the opening of the normally closed contact of the first contactor KM1 when the lifting equipment is in a power-on state.

[0071] In this way, the normally closed contact of the first contactor is controlled by the second contactor, so that the first contactor and the second contactor are in an interlocked state, and automatic function switching can be achieved when the lifting equipment is working normally or fails. The circuit structure is simple and easy to use.

[0072] Further optionally, a second normally open switch can be controlled by the controller, and the opening and closing of the second normally open contact of the second contactor KM2 can be controlled by the on-off state of the second normally open contact of the second contactor KM2, and the on-off state of the normally closed contact of the first contactor KM1 can be controlled by the on-off state of the second normally open contact of the second contactor KM2. In this way, the on-off state of the normally closed contact of the first contactor KM1 and the second normally open contact of the second contactor KM2 can be uniformly controlled by the controller, so as to avoid confusion in the system control logic and improve the safety of the system.

[0073] Based on this, Figure 5 The fifth structural diagram of the lifting equipment control system provided by the embodiment of the present invention is exemplarily shown. Figure 5 As shown, the lifting equipment control system may further include a controller 160 and a second normally open switch K2, and the second contactor KM2 may include a first normally open contact KM2-1 and a second normally open contact KM2-2. The second normally open switch K2 is connected between the power supply and the power supply control terminal A1 of the second normally open contact KM2-2, and the power supply control terminal of the second normally open switch K2 is connected to the second control terminal G2 of the controller.

[0074] The controller 160 can be used to control the second normally open switch K2 to close through the second control terminal G2 when powered on. The second normally open switch K2 can conduct the power supply to the power supply control terminal A1 of the second normally open contact KM2-2 when closed.

[0075] and Figure 4 The corresponding embodiment of the lifting equipment control system is similar. Figure 5In the embodiment, the energy storage circuit 140 may be a delta-connected capacitor circuit, and the lifting equipment control system may include a motor driver 170 .

[0076] For example, the motor 110 is a brushless DC motor, the motor driver 170 is a brushless DC motor driver, and the energy storage circuit 140 is a delta capacitor circuit. Figure 5 In the lifting equipment control system shown, when the lifting equipment is in normal operation, the power supply supplies power to the system normally, and the controller 160 can control the second normally open switch K2 to close through the second control terminal G2, so that the coil of the second contactor KM2 is in a current state. At this time, the first normally open contact KM2-1 and the second normally open contact KM2-2 are closed, and the DC brushless motor driver 170 can directly control the operation of the DC brushless motor 110; and the closed state of the second normally open contact KM2-2 makes the coil of the first contactor KM1 in a current state, and the normally closed contact KM1-1 of the first contactor is disconnected, and the delta-connected capacitor circuit 140 does not participate in the normal operation of the DC brushless motor 110, and will not affect the normal operation of the DC brushless motor 110.

[0077] When the lifting device is in a faulty state, the power supply to the system is cut off. At this time, the controller 160 cannot control the second normally open switch K2 to close, the coil of the second contactor KM2 is in a state without current, the first normally open contact KM2-1 and the second normally open contact KM2-2 are disconnected, and the normally closed contact KM1-1 of the first contactor is in a closed state, and the delta-connected capacitor circuit 140 and the DC brushless motor 110 are turned on. At this time, after the motor brake 120 is opened by the release device 130, the lifting device can slowly descend under the interaction of the delta-connected capacitor circuit 140 and the DC brushless motor 110. In this way, when the lifting device fails and is in a power-off state, the lifting device can be slowly lowered to a lower place, which is convenient for maintenance personnel to overhaul and avoids the safety hazards caused by high-altitude maintenance.

[0078] At the same time, the disconnected state of the first normally open contact KM2-1 can disconnect the DC brushless motor driver 170 and the DC brushless motor 110, so that the DC brushless motor 110 will not affect the DC brushless motor driver 170 when interacting with the delta-connected capacitor circuit 140, thereby improving the safety of the system.

[0079] The embodiment of the present invention further provides a lifting device, Figure 6 The structural diagram of the lifting device provided by the embodiment of the present invention is exemplarily shown. Figure 6 As shown, the lifting device 600 may include a car 610 and a lifting device control system 620 connected to the car 610 , and the lifting device control system 610 may be used to control the lifting of the car 610 .

[0080] Among them, the lifting equipment control system 620 can be the lifting equipment control system described in any of the above embodiments. Its structure and working principle can be found in the above description and will not be repeated here.

[0081] The lifting device provided by the embodiment of the present invention can open the motor brake by operating the release device when a fault occurs and the power is cut off. At this time, the lifting device can descend by gravity. During the descent process, the interaction between the motor and the energy storage circuit is used to provide a reaction force for the motor shaft, and finally the torque balance is achieved and the device slowly descends. In this way, when the lifting device fails and the power is cut off, the lifting device can be slowly lowered to a lower place, which is convenient for maintenance personnel to inspect and repair, and avoids the safety hazards caused by high-altitude inspection and repair.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A lifting equipment control system, characterized in that: include: Motor; A motor holding brake provided on the motor; A release device connected to the motor brake, the release device being used to release the motor brake; Energy storage circuit; A switch circuit is connected between the stator winding of the motor and the energy storage circuit. The switch circuit is used to connect the stator winding to the energy storage circuit when the lifting device is in a power-off state, so that the energy storage circuit stores the self-excitation electric energy of the motor; after the motor brake is opened, the lifting device descends by its own weight, so that the motor works in a self-excitation state; the energy storage circuit is used to provide the stored self-excitation electric energy to the motor, so that the rotating shaft of the motor is subjected to a reaction force; the reaction force can be converted into a reaction force when the lifting device descends, so as to slow down the descent speed of the lifting device.

2. The lifting equipment control system according to claim 1, characterized in that: The switch circuit comprises a first contactor, wherein a normally closed contact of the first contactor is connected between the stator winding and the energy storage circuit; The normally closed contact of the first contactor is closed when the lifting device is in a power-off state, and in the closed state, the stator winding is connected to the energy storage circuit.

3. The lifting equipment control system according to claim 2, characterized in that: The switch circuit also includes a second contactor, wherein the second contactor includes a first normally open contact; The first end of the first normally open contact is used to be connected to the driving end of the motor driver, and the second end is connected to the stator winding; The first normally open contact is opened when the normally closed contact of the first contactor is closed, and is closed when the normally closed contact of the first contactor is opened; The first normally open contact conducts the motor driver and the stator winding when closed.

4. The lifting equipment control system according to claim 3, characterized in that: The first end of the normally open contact of the first contactor is connected to the power supply control end of the first normally open contact, and the second end is used to be connected to the power supply of the lifting device; The normally open contact of the first contactor is used to control the first normally open contact to be opened when the lifting device is in a power-off state, and to control the first normally open contact to be closed when the lifting device is in a power-on state.

5. The lifting equipment control system according to claim 4, characterized in that: Also includes a controller and a first normally open switch; The first normally open switch is connected between the power supply and the power supply control end of the normally open contact of the first contactor, and the power supply control end of the first normally open switch is connected to the first control end of the controller; The controller is used to control the first normally open switch to close through the first control end in a power-on state, and the first normally open switch connects the power supply to the power supply control end of the normally open contact of the first contactor in a closed state.

6. The lifting equipment control system according to claim 3, characterized in that: The second contactor also includes a second normally open contact; The first end of the second normally open contact is connected to the power supply control end of the normally closed contact of the first contactor, and the second end is used to connect to the power supply of the lifting device; The second normally open contact is used to control the normally closed contact of the first contactor to close when the lifting device is in a power-off state, and to control the normally closed contact of the first contactor to open when the lifting device is in a power-on state.

7. The lifting equipment control system according to claim 6, characterized in that: Also included is a controller and a second normally open switch; The second normally open switch is connected between the power supply and the power supply control end of the second normally open contact, and the power supply control end of the second normally open switch is connected to the second control end of the controller; The controller is used to control the second normally open switch to close through the second control end in a power-on state, and the second normally open switch connects the power supply to the power supply control end of the second normally open contact in a closed state.

8. The lifting equipment control system according to any one of claims 2 to 7, characterized in that: The first contactor includes three normally closed contacts, and the energy storage circuit is a delta-connected capacitor circuit; The delta-connected capacitor circuit includes three delta-connected capacitors, and the three corner points of the delta-connected capacitor circuit are respectively connected to the three-phase connection terminals of the stator winding through a corresponding one of the normally closed contacts.

9. The lifting equipment control system according to any one of claims 1 to 7, characterized in that: The release device is a manual release device, and the manual release device is used to open the motor brake under the action of an external force.

10. A lifting device, characterized in that: include: Car; The lifting equipment control system according to any one of claims 1 to 9, wherein the lifting equipment control system is connected to the car, and the lifting equipment control system is used to control the lifting of the car.

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