Elevator brake control system

Abstract

The present invention discloses an elevator braking control system, comprising: two sets of brakes, one of which is powered by a three-phase AC power supply for the elevator; a power supply device, the other of the two sets of brakes being powered by the power supply device; a detection unit connected to the three-phase AC power supply for the elevator, for detecting whether the three-phase AC power supply for the elevator is powered off or has a phase loss; and a control unit for controlling the electrical connection between the other set of brakes and the power supply device. When the detection unit detects that the three-phase AC power supply for the elevator is powered off or has a phase loss, the control unit does not immediately cut off the electrical connection between the other set of brakes and the power supply device, but instead cuts off the electrical connection between the other set of brakes and the power supply device after a predetermined delay. Therefore, the present invention can significantly reduce the deceleration of the elevator car during braking, thereby achieving smooth braking of the elevator car and improving the safety and comfort of the elevator.

Description

Technical Field

[0001] The invention relates to an elevator braking control system. Background Art

[0002] As a vertical transportation tool, elevators have always garnered public attention for their safety and comfort. In densely populated developing countries, buildings often experience frequent and unpredictable power outages. This can cause the elevator drive to lose power, instantly releasing the brakes. This creates significant friction between the elevator's traction medium (such as wire ropes, steel belts, or plastic-coated wire ropes), particularly the steel belts, and the drive shaft, causing the elevator car to stop immediately and experiencing significant deceleration. This can cause significant discomfort and, in severe cases, injury to passengers. Currently, existing elevators on the market release their brakes immediately when power is lost or a phase is lost, and brake control technology is based on the presence of a power source. This creates an urgent need for intelligent control in elevators during power outages or phase losses, ensuring both passenger safety and a relatively gentle braking action. Summary of the Invention

[0003] The purpose of the present invention is to solve at least one aspect of the above-mentioned problems and defects in the prior art.

[0004] According to one aspect of the present invention, there is provided an elevator braking control system, comprising: two sets of brakes, one set of brakes being powered by a three-phase AC power supply for the elevator; a power supply device, the other set of brakes in the two sets of brakes being powered by the power supply device; a detection unit connected to the three-phase AC power supply for the elevator, for detecting whether the three-phase AC power supply for the elevator is powered off or has a phase loss; and a control unit for controlling the electrical connection between the other set of brakes and the power supply device, wherein when the detection unit detects that the three-phase AC power supply for the elevator is powered off or has a phase loss, the control unit does not immediately cut off the electrical connection between the other set of brakes and the power supply device, but cuts off the electrical connection between the other set of brakes and the power supply device after a predetermined delay.

[0005] According to an exemplary embodiment of the present invention, the detection unit includes a phase sequence relay, which has three input terminals and a normally closed contact; the three input terminals of the phase sequence relay are respectively electrically connected to the three live wires of the elevator three-phase AC power supply; when the elevator three-phase AC power supply is powered off or has a phase loss, the phase sequence relay is activated, so that the normally closed contact of the phase sequence relay switches from a closed state to an open state.

[0006] According to another exemplary embodiment of the present invention, the control unit includes: a first contactor, including a coil and two normally closed contacts; a power-on delay relay, including a coil and a normally open contact; and a second contactor, including a coil and at least one normally closed contact, the normally closed contact of the phase sequence relay is connected in series with the coil of the first contactor and electrically connected to the power supply device, the coil of the power-on delay relay is connected in series with one normally closed contact of the first contactor and electrically connected to the power supply device, the other normally closed contact of the first contactor, the normally open contact of the power-on delay relay and the coil of the second contactor are connected in series and electrically connected to the power supply device, and the normally closed contact of the second contactor is connected in series to the electrical connection line between the other set of brakes and the power supply device.

[0007] According to another exemplary embodiment of the present invention, the control unit further includes a diode bridge rectifier, which is connected in series between the power supply device and the other set of brakes, and is used to convert the alternating current output by the power supply device into direct current required by the other set of brakes.

[0008] According to another exemplary embodiment of the present invention, the two input terminals of the diode bridge rectifier are respectively connected to the two output terminals of the power supply device, and the two connection terminals of the other set of brakes are respectively connected to the two output terminals of the diode bridge rectifier.

[0009] According to another exemplary embodiment of the present invention, the second contactor includes two normally closed contacts, one of the two normally closed contacts of the second contactor is connected in series between one terminal of the other group of brakes and one output terminal of the diode bridge rectifier; the other of the two normally closed contacts of the second contactor is connected in series between the other terminal of the other group of brakes and the other output terminal of the diode bridge rectifier.

[0010] According to another exemplary embodiment of the present invention, the control unit also includes a third contactor, which includes a coil and at least one normally closed contact; the coil of the second contactor and the coil of the third contactor are connected in parallel and then connected in series with the normally open contact of the power-on delay relay and another normally closed contact of the first contactor; the normally closed contact of the third contactor is connected in series between the other set of brakes and the diode bridge rectifier.

[0011] According to another exemplary embodiment of the present invention, the third contactor includes two normally closed contacts, one of the two normally closed contacts of the third contactor is connected in series between one terminal of the other group of brakes and one output terminal of the diode bridge rectifier; the other of the two normally closed contacts of the third contactor is connected in series between the other terminal of the other group of brakes and the other output terminal of the diode bridge rectifier.

[0012] According to another exemplary embodiment of the present invention, when the three-phase AC power supply of the elevator is normal, the normally closed contacts of the second contactor and the third contactor are in a closed state, and the coils of the other set of brakes are energized, so that the other set of brakes is in a released non-braking state.

[0013] According to another exemplary embodiment of the present invention, when the normally closed contacts of the phase sequence relay are in a closed state, the coil of the first contactor is energized, the two normally closed contacts of the first contactor are in an open state, the power-on delay relay is de-energized and the time is not counted, the normally open contacts of the power-on delay relay are in an open state, the coils of the second contactor and the third contactor are de-energized, and the normally closed contacts of the second contactor and the third contactor are in a closed state.

[0014] According to another exemplary embodiment of the present invention, when the three-phase AC power supply of the elevator is out of power or has a phase loss and the duration of the power outage or phase loss has not reached the predetermined time, the normally closed contacts of the second contactor and the third contactor are still in a closed state, and the coil of the other set of brakes is still energized, so that the other set of brakes is still in a released non-braking state.

[0015] According to another exemplary embodiment of the present invention, when the normally closed contacts of the phase sequence relay switch from a closed state to an open state, the coil of the first contactor loses power, the two normally closed contacts of the first contactor are in a closed state, the power-on delay relay is energized and starts timing, the normally open contacts of the power-on delay relay are still in an open state, the coils of the second contactor and the third contactor lose power, and the normally closed contacts of the second contactor and the third contactor are still in a closed state.

[0016] According to another exemplary embodiment of the present invention, when the three-phase AC power supply of the elevator is out of power or has a phase loss and the duration of the power outage or phase loss reaches the predetermined time, the normally closed contacts of the second contactor and the third contactor are switched to the open state, and the coil of the other set of brakes loses power, so that the other set of brakes is in a released braking state.

[0017] According to another exemplary embodiment of the present invention, when the time that the normally closed contacts of the phase sequence relay are in the disconnected state reaches the predetermined time, the coil of the first contactor loses power, the two normally closed contacts of the first contactor are in the closed state, the normally open contacts of the power-on delay relay are switched to the closed state, the coils of the second contactor and the third contactor are energized, and the normally closed contacts of the second contactor and the third contactor are switched to the disconnected state.

[0018] According to another exemplary embodiment of the present invention, the power supply device includes an energy storage device capable of storing electrical energy, so as to still supply power to the other set of brakes when the three-phase AC power supply of the elevator is powered off or lacks a phase.

[0019] According to another exemplary embodiment of the present invention, the power supply device includes at least one of an uninterruptible power supply, a battery, an electrolytic capacitor, and a supercapacitor.

[0020] According to another exemplary embodiment of the present invention, the power supply device is powered by the elevator three-phase AC power supply, and two input terminals of the power supply device are respectively connected to a live wire and a neutral wire of the elevator three-phase AC power supply.

[0021] According to another exemplary embodiment of the present invention, the elevator braking control system further includes a circuit breaker, which is directly connected to the two output ends of the power supply device and connected in series between the other set of brakes and the power supply device; when the output current or voltage of the power supply device is abnormal, the circuit breaker cuts off the electrical connection between the other set of brakes and the power supply device.

[0022] In the aforementioned exemplary embodiments of the present invention, when the elevator's three-phase AC power supply fails or a phase is lost, one of the two brake sets loses power first and is released into a braking state, while the other set remains energized and maintained in a non-braking state. Therefore, during the initial period immediately following a power outage, only one brake set brakes the elevator car. This significantly reduces the deceleration of the car during braking, enabling smooth braking of the elevator car and improving elevator safety and comfort.

[0023] Other objects and advantages of the present invention will become apparent from the following description of the present invention with reference to the accompanying drawings, which will help to provide a comprehensive understanding of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram showing an elevator braking control system according to an exemplary embodiment of the present invention, wherein the situation when the elevator three-phase AC power supply is normal is shown;

[0025] Figure 2A schematic diagram of an elevator braking control system according to an exemplary embodiment of the present invention is shown, wherein the situation in which a power outage or phase loss occurs in the elevator's three-phase AC power supply, but the duration of the power outage or phase loss has not reached a predetermined time;

[0026] Figure 3 A schematic diagram of an elevator braking control system according to an exemplary embodiment of the present invention is shown, which shows a situation where the elevator three-phase AC power supply is cut off or lacks a phase, and the duration of the cut off or lack of phase reaches a predetermined time. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be further described in detail below through examples and in conjunction with the accompanying drawings. In the specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the overall inventive concept of the present invention and should not be construed as limiting the present invention.

[0028] In addition, in the following detailed description, for ease of explanation, numerous specific details are set forth to provide a comprehensive understanding of the disclosed embodiments. However, it is apparent that one or more embodiments can be practiced without these specific details. In other cases, well-known structures and devices are shown in diagrammatic form to simplify the accompanying drawings.

[0029] According to one general technical concept of the present invention, an elevator brake control system is provided, comprising: two sets of brakes, one of which is powered by a three-phase AC power supply for the elevator; a power supply device, the other of the two sets of brakes being powered by the power supply device; a detection unit connected to the three-phase AC power supply for the elevator and configured to detect whether the three-phase AC power supply for the elevator is disconnected or has a phase loss; and a control unit configured to control the electrical connection between the other set of brakes and the power supply device. When the detection unit detects a power failure or phase loss in the three-phase AC power supply for the elevator, the control unit does not immediately disconnect the other set of brakes from the power supply device, but instead disconnects the other set of brakes from the power supply device after a predetermined delay.

[0030] Figure 1 A schematic diagram showing an elevator braking control system according to an exemplary embodiment of the present invention, wherein the situation when the elevator three-phase AC power supply is normal is shown; Figure 2 A schematic diagram of an elevator braking control system according to an exemplary embodiment of the present invention is shown, wherein the situation in which a power outage or phase loss occurs in the elevator's three-phase AC power supply, but the duration of the power outage or phase loss has not reached a predetermined time; Figure 3A schematic diagram of an elevator braking control system according to an exemplary embodiment of the present invention is shown, which shows a situation where the elevator three-phase AC power supply is cut off or lacks a phase, and the duration of the cut off or lack of phase reaches a predetermined time.

[0031] like Figures 1 to 3 As shown, in the illustrated embodiment, the elevator braking control system mainly includes two sets of brakes B1 and B2, a power supply device 10, a detection unit (which will be described in detail later) and a control unit (which will be described in detail later).

[0032] like Figures 1 to 3 As shown, in the embodiment shown in the figure, one of the two brake groups B1 and B2 is powered by the elevator three-phase AC power supply, and the other brake group B2 is powered by the power supply device 10.

[0033] like Figures 1 to 3 As shown in the illustrated embodiment, the elevator's three-phase AC power supply includes three live wires L1, L2, and L3 and a neutral wire N. The three inputs of the elevator's traction machine M are connected to the three live wires L1, L2, and L3 of the elevator's three-phase AC power supply, and are powered by the elevator's three-phase AC power supply. A set of brakes B1 has two inputs connected to the two outputs of a first diode bridge rectifier UR1. The first diode bridge rectifier UR1 also has two inputs connected to the live wire L1 and neutral wire N of the elevator's three-phase AC power supply. The first diode bridge rectifier UR1 is used to convert AC power into DC power suitable for the brakes.

[0034] like Figures 1 to 3 As shown, in the embodiment shown in the figure, the detection unit is connected to the elevator three-phase AC power supply and is used to detect whether the elevator three-phase AC power supply is powered off or has a phase loss. The control unit is used to control the electrical connection between another set of brakes B2 and the power supply device 10.

[0035] like Figures 1 to 3 As shown, in the illustrated embodiment, when the detection unit detects a power outage or phase loss in the elevator's three-phase AC power supply, the control unit does not immediately disconnect the electrical connection between the other set of brakes B2 and the power supply device 10. Instead, it disconnects the electrical connection between the other set of brakes B2 and the power supply device 10 after a predetermined delay. Thus, during the period immediately following a power outage or phase loss in the elevator's three-phase AC power supply, only one set of brakes B1 brakes the car. This significantly reduces the deceleration of the car during braking, thereby achieving smooth braking of the elevator car and improving the safety and comfort of the elevator.

[0036] like Figures 1 to 3In the illustrated embodiment, the detection unit includes a phase sequence relay KPH, which has three input terminals P1, P2, and P3 and a normally closed contact KPH+. The three input terminals P1, P2, and P3 of the phase sequence relay KPH are electrically connected to the three live wires L1, L2, and L3 of the elevator's three-phase AC power supply, respectively. When the elevator's three-phase AC power supply fails or a phase is missing, the phase sequence relay KPH activates, causing the normally closed contact KPH+ of the phase sequence relay KPH to switch from a closed state to an open state.

[0037] like Figures 1 to 3 As shown, in the illustrated embodiment, the control unit includes: a first contactor K1, comprising a coil and two normally closed contacts K1+; a power-on delay relay KT, comprising a coil and a normally open contact KT-; and a second contactor K2, comprising a coil and at least one normally closed contact K2+. The normally closed contact KPH+ of the phase sequence relay KPH is connected in series with the coil of the first contactor K1 and is electrically connected to the power supply device 10. The coil of the power-on delay relay KT is connected in series with one normally closed contact K1+ of the first contactor K1 and is electrically connected to the power supply device 10. The other normally closed contact K1+ of the first contactor K1, the normally open contact KT- of the power-on delay relay KT, and the coil of the second contactor K2 are connected in series with the power supply device 10. The normally closed contact K2+ of the second contactor K2 is connected in series with the electrical connection line between another set of brakes B2 and the power supply device 10.

[0038] like Figures 1 to 3 As shown, in the illustrated embodiment, the control unit further includes a diode bridge rectifier UR2, which is connected in series between the power supply device 10 and another group of brakes B2, and is used to convert the AC power output by the power supply device 10 into the DC power required by the other group of brakes B2.

[0039] like Figures 1 to 3 As shown, in the illustrated embodiment, the two input terminals of the diode bridge rectifier UR2 are respectively connected to the two output terminals of the power supply device 10, and the two connection terminals D1 and D2 of another group of brakes B2 are respectively connected to the two output terminals of the diode bridge rectifier UR2.

[0040] like Figures 1 to 3 As shown, in the illustrated embodiment, the second contactor K2 includes two normally closed contacts K2+, one of which is connected in series between a terminal D1 of another brake group B2 and an output terminal of the diode bridge rectifier UR2. The other of the two normally closed contacts K2+ of the second contactor K2 is connected in series between the other terminal D2 of the other brake group B2 and the other output terminal of the diode bridge rectifier UR2.

[0041] like Figures 1 to 3 As shown, in the illustrated embodiment, the control unit also includes a third contactor K3, which includes a coil and at least one normally closed contact K3+. The coils of the second contactor K2 and the third contactor K3 are connected in parallel, then connected in series with the normally open contact KT- of the power-on delay relay KT and the other normally closed contact K+ of the first contactor K2. The normally closed contact K3+ of the third contactor K3 is connected in series between another brake set B2 and the diode bridge rectifier UR2.

[0042] like Figures 1 to 3 As shown, in the illustrated embodiment, the third contactor K3 includes two normally closed contacts K3+, one of which is connected in series between a terminal D1 of another brake group B2 and an output terminal of the diode bridge rectifier UR2. The other of the two normally closed contacts K3+ of the third contactor K3 is connected in series between the other terminal D2 of another brake group B2 and the other output terminal of the diode bridge rectifier UR2.

[0043] like Figure 1 As shown, in the illustrated embodiment, when the three-phase AC power supply of the elevator is normal, the normally closed contacts K2+ and K3+ of the second contactor K2 and the third contactor K3 are in a closed state, and the coil of the other set of brakes B2 is energized, so that the other set of brakes B2 is in a released non-braking state.

[0044] like Figure 1 As shown, in the illustrated embodiment, when the normally closed contact KPH+ of the phase sequence relay KPH is in a closed state, the coil of the first contactor K1 is energized, the two normally closed contacts K1+ of the first contactor K1 are in an open state, the power-on delay relay KT loses power and the timing is not counted, the normally open contact KT- of the power-on delay relay KT is in an open state, the coils of the second contactor K2 and the third contactor K3 lose power, and the normally closed contacts K2+ and K3+ of the second contactor K2 and the third contactor K3 are in a closed state.

[0045] like Figure 2 As shown, in the illustrated embodiment, when the three-phase AC power supply of the elevator is cut off or lacks a phase and the duration of the power cut or phase lack has not reached the predetermined time, the normally closed contacts K2+ and K3+ of the second contactor K2 and the third contactor K3 are still in the closed state, and the coil of the other set of brakes B2 is still energized, so that the other set of brakes B2 is still in the released non-braking state.

[0046] like Figure 2As shown, in the illustrated embodiment, when the normally closed contact KPH+ of the phase sequence relay KPH switches from a closed state to an open state, the coil of the first contactor K1 loses power, the two normally closed contacts K1+ of the first contactor K1 are in a closed state, the power-on delay relay KT is energized and starts timing, the normally open contact KT- of the power-on delay relay KT is still in an open state, the coils of the second contactor K2 and the third contactor K3 lose power, and the normally closed contacts K2+ and K3+ of the second contactor K2 and the third contactor K3 are still in a closed state.

[0047] like Figure 3 As shown, in the illustrated embodiment, when the three-phase AC power supply of the elevator is cut off or lacks a phase and the duration of the power cut or phase lack reaches a predetermined time, the normally closed contacts K2+ and K3+ of the second contactor K2 and the third contactor K3 are switched to the open state, and the coil of the other set of brakes B2 loses power, so that the other set of brakes B2 is in a released braking state.

[0048] like Figure 3 As shown, in the illustrated embodiment, when the time when the normally closed contact KPH+ of the phase sequence relay KPH is in the open state reaches a predetermined time, the coil of the first contactor K1 loses power, the two normally closed contacts K1+ of the first contactor K1 are in the closed state, the normally open contact KT- of the power-on delay relay KT is switched to the closed state, the coils of the second contactor K2 and the third contactor K3 are energized, and the normally closed contacts K2+ and K3+ of the second contactor K2 and the third contactor K3 are switched to the open state.

[0049] like Figures 1 to 3 As shown, in the illustrated embodiment, the power supply device 10 includes an energy storage device capable of storing electrical energy so as to still supply power to another set of brakes B2 when the three-phase AC power supply of the elevator is cut off or lacks a phase.

[0050] like Figures 1 to 3 As shown, in the illustrated embodiment, the power supply device 10 includes at least one of an uninterruptible power supply, a battery, an electrolytic capacitor, and a supercapacitor.

[0051] like Figures 1 to 3 As shown, in the illustrated embodiment, the power supply device 10 is powered by the elevator three-phase AC power supply, and two input terminals of the power supply device 10 are respectively connected to a live wire L1 and a neutral wire N of the elevator three-phase AC power supply.

[0052] like Figures 1 to 3As shown, in the illustrated embodiment, the elevator braking control system further includes a circuit breaker S, which is directly connected to the two output terminals of the power supply device 10 and is connected in series between another set of brakes B2 and the power supply device 10; when the output current or voltage of the power supply device 10 is abnormal, the circuit breaker S cuts off the electrical connection between the other set of brakes B2 and the power supply device 10.

[0053] Those skilled in the art will appreciate that the embodiments described above are exemplary and that they may be improved upon. The structures described in the various embodiments may be freely combined without causing any conflict in structure or principle.

[0054] Although the present invention has been described in conjunction with the accompanying drawings, the embodiments disclosed in the drawings are intended to exemplify the preferred embodiments of the present invention and should not be construed as limiting the present invention.

[0055] Although some embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made to these embodiments without departing from the principles and spirit of the present general inventive concept, the scope of which is defined in the claims and their equivalents.

[0056] It should be noted that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. In addition, any element reference in the claims should not be construed as limiting the scope of the invention.

Claims

1. An elevator braking control system, characterized in that: include: Two sets of brakes (B1, B2), one of which (B1) is powered by the elevator's three-phase AC power supply; A power supply device (10), wherein the other set of brakes (B2) of the two sets of brakes (B1, B2) is powered by the power supply device (10); a detection unit connected to the elevator three-phase AC power supply, for detecting whether the elevator three-phase AC power supply is powered off or has a phase missing; and a control unit for controlling the electrical connection between the other set of brakes (B2) and the power supply device (10), When the detection unit detects that the three-phase AC power supply of the elevator is powered off or has a phase loss, the control unit does not immediately cut off the electrical connection between the other set of brakes (B2) and the power supply device (10), but only brakes the car with the other set of brakes, and only cuts off the electrical connection between the other set of brakes (B2) and the power supply device (10) after a predetermined delay.

2. The elevator braking control system according to claim 1, characterized in that: The detection unit includes a phase sequence relay (KPH), which has three input terminals (P1, P2, P3) and a normally closed contact (KPH+); The three input terminals (P1, P2, P3) of the phase sequence relay (KPH) are respectively electrically connected to the three live wires (L1, L2, L3) of the elevator three-phase AC power supply; When the three-phase AC power supply of the elevator is powered off or has a phase loss, the phase sequence relay (KPH) is actuated, so that the normally closed contact (KPH+) of the phase sequence relay (KPH) switches from a closed state to an open state.

3. The elevator braking control system according to claim 2, characterized in that: The control unit comprises: a first contactor (K1) comprising a coil and two normally closed contacts (K1+); An energized time delay relay (KT) comprising a coil and a normally open contact (KT-); and A second contactor (K2) comprising a coil and at least one normally closed contact (K2+), The normally closed contact (KPH+) of the phase sequence relay (KPH) is connected in series with the coil of the first contactor (K1) and then electrically connected to the power supply device (10). The coil of the power-on delay relay (KT) is connected in series with a normally closed contact (K1+) of the first contactor (K1) and then electrically connected to the power supply device (10). Another normally closed contact (K1+) of the first contactor (K1), the normally open contact (KT-) of the power-on delay relay (KT), and the coil of the second contactor (K2) are connected in series and then electrically connected to the power supply device (10). The normally closed contact (K2+) of the second contactor (K2) is connected in series to the electrical connection line between the other set of brakes (B2) and the power supply device (10).

4. The elevator braking control system according to claim 3, characterized in that: The control unit further comprises a diode bridge rectifier (UR2), which is connected in series between the power supply device (10) and the other set of brakes (B2) and is used to convert the alternating current output by the power supply device (10) into the direct current required by the other set of brakes (B2).

5. The elevator braking control system according to claim 4, characterized in that: The two input ends of the diode bridge rectifier (UR2) are respectively connected to the two output ends of the power supply device (10), and the two connection terminals (D1, D2) of the other group of brakes (B2) are respectively connected to the two output ends of the diode bridge rectifier (UR2).

6. The elevator braking control system according to claim 5, characterized in that: The second contactor (K2) comprises two normally closed contacts (K2+), one of the two normally closed contacts (K2+) of the second contactor (K2) being connected in series between a terminal (D1) of the other set of brakes (B2) and an output terminal of the diode bridge rectifier (UR2); The other of the two normally closed contacts (K2+) of the second contactor (K2) is connected in series between the other terminal (D2) of the other group of brakes (B2) and the other output end of the diode bridge rectifier (UR2).

7. The elevator braking control system according to claim 6, characterized in that: The control unit further comprises a third contactor (K3), wherein the third contactor (K3) comprises a coil and at least one normally closed contact (K3+); The coil of the second contactor (K2) and the coil of the third contactor (K3) are connected in parallel and then connected in series with the normally open contact (KT-) of the power-on delay relay (KT) and another normally closed contact (K+) of the first contactor (K2); The normally closed contact (K3+) of the third contactor (K3) is connected in series between the other set of brakes (B2) and the diode bridge rectifier (UR2).

8. The elevator braking control system according to claim 7, characterized in that: The third contactor (K3) includes two normally closed contacts (K3+), one of the two normally closed contacts (K3+) of the third contactor (K3) is connected in series between a terminal (D1) of the other brake group (B2) and an output end of the diode bridge rectifier (UR2); The other of the two normally closed contacts (K3+) of the third contactor (K3) is connected in series between the other terminal (D2) of the other group of brakes (B2) and the other output end of the diode bridge rectifier (UR2).

9. The elevator braking control system according to claim 8, characterized in that: When the three-phase AC power supply of the elevator is normal, the normally closed contacts (K2+, K3+) of the second contactor (K2) and the third contactor (K3) are in a closed state, and the coil of the other set of brakes (B2) is energized, so that the other set of brakes (B2) is in a released non-braking state.

10. The elevator braking control system according to claim 9, characterized in that: When the normally closed contact (KPH+) of the phase sequence relay (KPH) is in a closed state, the coil of the first contactor (K1) is energized, the two normally closed contacts (K1+) of the first contactor (K1) are in an open state, the power-on delay relay (KT) loses power and does not count, the normally open contact (KT-) of the power-on delay relay (KT) is in an open state, the coils of the second contactor (K2) and the third contactor (K3) lose power, and the normally closed contacts (K2+, K3+) of the second contactor (K2) and the third contactor (K3) are in a closed state.

11. The elevator braking control system according to claim 8, characterized in that: When the three-phase AC power supply of the elevator is powered off or has a phase loss and the duration of the power off or phase loss has not reached the predetermined time, the normally closed contacts (K2+, K3+) of the second contactor (K2) and the third contactor (K3) are still in a closed state, and the coil of the other set of brakes (B2) is still energized, so that the other set of brakes (B2) is still in a released non-braking state.

12. The elevator braking control system according to claim 11, characterized in that: When the normally closed contact (KPH+) of the phase sequence relay (KPH) switches from a closed state to an open state, the coil of the first contactor (K1) loses power, the two normally closed contacts (K1+) of the first contactor (K1) are in a closed state, the power-on delay relay (KT) is energized and starts timing, the normally open contact (KT-) of the power-on delay relay (KT) remains in an open state, the coils of the second contactor (K2) and the third contactor (K3) lose power, and the normally closed contacts (K2+, K3+) of the second contactor (K2) and the third contactor (K3) remain in a closed state.

13. The elevator braking control system according to claim 12, characterized in that: When the three-phase AC power supply of the elevator is powered off or has a phase loss and the duration of the power off or phase loss reaches the predetermined time, the normally closed contacts (K2+, K3+) of the second contactor (K2) and the third contactor (K3) are switched to the disconnected state, and the coil of the other set of brakes (B2) loses power, so that the other set of brakes (B2) is in a released braking state.

14. The elevator braking control system according to claim 13, characterized in that: When the time that the normally closed contact (KPH+) of the phase sequence relay (KPH) is in the disconnected state reaches the predetermined time, the coil of the first contactor (K1) loses power, the two normally closed contacts (K1+) of the first contactor (K1) are in the closed state, the normally open contact (KT-) of the power-on delay relay (KT) is switched to the closed state, the coils of the second contactor (K2) and the third contactor (K3) are energized, and the normally closed contacts (K2+, K3+) of the second contactor (K2) and the third contactor (K3) are switched to the disconnected state.

15. The elevator braking control system according to claim 1, characterized in that: The power supply device (10) includes an energy storage device capable of storing electric energy so as to still supply power to the other set of brakes (B2) when the three-phase AC power supply of the elevator is powered off or has a phase loss.

16. The elevator braking control system according to claim 15, characterized in that: The power supply device (10) comprises at least one of an uninterruptible power supply, a battery, an electrolytic capacitor, and a supercapacitor.

17. The elevator braking control system according to claim 15, characterized in that: The power supply device (10) is powered by the elevator three-phase AC power supply, and two input ends of the power supply device (10) are respectively connected to a live wire (L1) and a neutral wire (N) of the elevator three-phase AC power supply.

18. The elevator braking control system according to claim 1, characterized in that: The elevator braking control system further comprises a circuit breaker (S), the circuit breaker (S) being directly connected to two output terminals of the power supply device (10) and being connected in series between the other set of brakes (B2) and the power supply device (10); When an abnormality occurs in the output current or voltage of the power supply device (10), the circuit breaker (S) cuts off the electrical connection between the other set of brakes (B2) and the power supply device (10).

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