Integrated intelligent star contactor for elevator

Abstract

The application discloses an integrated intelligent star-sealing contactor for an elevator, and relates to the fields of low-voltage contactors and elevators. The integrated intelligent star-sealing contactor for the elevator comprises an elevator operation contact unit, an elevator star-sealing contact unit, a self-locking contact unit, a mirror contact unit, a star-sealing detection intelligent control unit, a rectification surge suppression unit and a solenoid type direct-current electromagnet unit. The integrated intelligent star-sealing contactor for the elevator integrates the operation contact and the star-sealing contact of the contactor for controlling the elevator, realizes the time sequence control of the elevator operation and the star-sealing through mechanical linkage, and is provided with a pulse intelligent module, so that the in-machine state, the current specification and the effectiveness of the star-sealing of the star-sealing contactor can be effectively detected.

Description

Technical Field

[0001] This invention relates to the field of detection device technology, specifically to an integrated intelligent sealing contactor for elevators. Background Technology

[0002] Most elevators currently on the market use permanent magnet synchronous gearless traction motors. These motors connect the three-phase winding leads in a star configuration using wires or series resistors, a configuration known in the industry as "star-connected."

[0003] When an elevator stops operating due to a power outage or a brake malfunction, the loss of driving torque and the resulting imbalance between the counterweight and car cause the elevator to roll away. In this situation, a contactor used in the traction machine is used to "seal off" the circuit by short-circuiting the U, V, and W phases, creating three closed coils in the armature. This causes the elevator motor to rotate, generating an induced electromotive force and magnetic field in these closed coils. The induced magnetic field interacts with the rotor magnetic field, producing a braking torque opposite to the direction of the elevator car's movement, ultimately restoring the elevator to balance. Therefore, sealing off contactors are increasingly used in elevator emergency rescue and safety technology.

[0004] Current contactor-based star-sealing solutions use two contactors: one for operation control and the other for star-sealing. This solution is costly, has complex wiring, and, according to the new "Elevator Type Test Rules," requires a run-through test to verify the star-sealing effectiveness every 24 hours. Run-through testing must be performed with the car unoccupied, necessitating an unoccupied status detection function and setting run-through distances. Furthermore, it can damage the star-sealing contacts. This invention uses an integrated contactor for both operation and star-sealing, resulting in lower cost and simpler wiring with only three input and three output wires. It also includes an intelligent control unit for star-sealing detection, eliminating the need for run-through testing and greatly simplifying system setup. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated intelligent sealing contactor for elevators to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0007] An integrated intelligent sealing contactor for elevators includes a solenoid DC electromagnet unit and a housing connected to the top of the solenoid DC electromagnet unit. The housing has multiple guide grooves on its sides and in the middle, with moving contact brackets embedded in each groove. Each moving contact bracket is a rectangular strip structure with multiple moving contact mounting holes arranged side-by-side along its height. Elevator running contact units are respectively installed on the lower row of moving contact mounting holes. Self-locking contact units are respectively installed in the moving contact mounting holes on both sides of each elevator running contact unit. Simultaneously, the upper part of the elevator running contact unit... Elevator sealing star contact units are respectively provided in the contact mounting holes, and mirror contact units are provided on both sides of the elevator sealing star contact units; a rectification surge suppression unit is also provided at the bottom of the elevator running contact unit; a sealing star detection intelligent control unit is provided on the upper part of the housing; the elevator running contact unit includes an array of double-break type normally open main contacts, and the output terminals of the elevator running contact unit and the output terminals of the elevator sealing star contact unit are connected in parallel through a "Z" type connecting bar; the elevator sealing star contact unit includes an array of double-break type normally closed main contacts, and the input terminals of the elevator sealing star contact unit are shorted in a "star" shape by a comb-shaped conductive bar;

[0008] The self-locking contact unit includes an array of dual-break type normally open auxiliary contacts, and the mirror contact unit includes an array of dual-break type normally closed auxiliary contacts.

[0009] Preferably, each set of vertically arranged moving contact mounting holes on the moving contact bracket is opened on a separate cylindrical shell, and a groove adapted to the shape of the guide groove is provided between each set of cylindrical shells to facilitate the locking of the moving contact bracket with the guide groove.

[0010] Preferably, the elevator running contact unit, elevator sealing contact unit, self-locking contact unit, and mirror contact unit further include an array of stationary contacts disposed on the housing.

[0011] Preferably, the sealing contactor detection intelligent control unit includes a control cover connected to the top of the housing. The control cover has an array of detection sockets arranged in parallel on its upper part and a pulse intelligent module inside. An array of spring terminals is provided between the pulse intelligent module and the detection sockets. The pulse intelligent module exchanges information with the elevator control system through the spring terminals and the detection sockets to effectively detect the on-machine status, current specifications, and sealing effectiveness of the sealing contactor.

[0012] The beneficial effects of this invention are as follows:

[0013] 1. The present invention is an integrated intelligent star-sealing contactor for elevators. It controls the starting and running of the elevator through the elevator running contact unit. The power supply terminal of the permanent magnet synchronous traction motor on the elevator is short-circuited in a star shape through the elevator star-sealing contact unit. When the elevator has an abnormal fault, the power supply terminal is disconnected and a reverse braking torque is generated, which decelerates and brakes the permanent magnet synchronous traction motor, and finally makes the elevator stop at a constant speed.

[0014] 2. This invention uses a sealing detection intelligent control unit to identify the on-machine status, current specifications, and sealing effectiveness of the sealing contactor through pulse signals, thereby achieving online detection and monitoring of the sealing process and ensuring its safety, effectiveness, and controllability.

[0015] 3. This invention integrates three major functions—elevator operation, elevator sealing, and sealing detection—into a single contactor, achieving intelligent and integrated operation, sealing, and detection. It enables real-time monitoring during elevator operation and immediately prevents accidents by sealing the elevator in case of abnormalities or malfunctions. The sealing detection function operates continuously to ensure timely and effective sealing status. All functional modules are effectively controlled intelligently.

[0016] 4. This invention has low cost, only requires three incoming lines and three outgoing lines for wiring, and the sealing detection intelligent control unit ensures that the elevator does not need to perform slippage detection, which greatly simplifies the system setup. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of each contact unit of the present invention;

[0019] Figure 3 This is a schematic diagram of the assembly structure of each contact unit and the housing in this invention;

[0020] Figure 4 This is a schematic diagram of the structure of each contact unit and the moving contact support of the present invention;

[0021] Figure 5 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 6 This is a schematic diagram of the intelligent control unit for sealing detection in this invention;

[0023] Figure 7 This is a schematic diagram of the sealing process of the present invention;

[0024] Figure 8 This is a schematic diagram of the sealing detection process of the present invention;

[0025] In the diagram: 1. Elevator running contact unit; 101. Double-break type normally open main contact; 102. "Z" type connecting bar; 2. Elevator sealing star contact unit; 201. Double-break type normally closed main contact; 202. Comb-shaped conductive bar; 3. Self-locking contact unit; 301. Double-break type normally open auxiliary contact; 4. Mirror contact unit; 401. Double-break type normally closed auxiliary contact; 5. Sealing star detection intelligent control unit; 501. Control cover; 502. Pulse intelligent module; 503. Detection connector; 504. Spring terminal; 6. Rectifier surge suppression unit; 7. Solenoid type DC electromagnet unit; 8. Housing; 9. Moving contact bracket. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings.

[0027] like Figure 1-6 The elevator integrated intelligent sealing contactor shown includes an elevator running contact unit 1, an elevator sealing contact unit 2, a self-locking contact unit 3, a mirror contact unit 4, a sealing detection intelligent control unit 5, a rectifier surge suppression unit 6, and a solenoid DC electromagnet unit 7. The elevator running contact unit 1 and the elevator sealing contact unit 2 are arranged in upper and lower layers, with the sealing contact unit 2 on the upper layer and the elevator running contact unit 1 on the lower layer. The self-locking contact unit 3 and the mirror contact unit 4 are respectively arranged on both sides of the elevator running contact unit 1 and the elevator sealing contact unit 2, and are integrated into the contactor body. Each contact unit is symmetrically arranged vertically, horizontally, and front-back. The sealing detection intelligent control unit 5 is built into the top of the contactor. The rectifier surge suppression unit 6 and the solenoid DC electromagnet unit 7 are arranged below the elevator running contact unit 1. When energized, the moving contact bracket 9 moves downward, causing the elevator running contact unit 1 to close and connect the main circuit, thus enabling the elevator to start and run normally. When the solenoid DC electromagnet unit 7 is normally de-energized or forcibly de-energized due to elevator overspeed, the moving contact bracket 9 moves upward under the action of the reaction spring, causing the elevator running contact unit 1 to open, the elevator sealing contact unit 2 to close, and short-circuiting the power supply terminal of the permanent magnet synchronous traction motor on the elevator in a "star" configuration. At this time, the permanent magnet synchronous traction motor generates a reverse braking torque, causing the permanent magnet synchronous traction motor to decelerate and brake, ultimately bringing the elevator to a constant speed stop. The sealing detection intelligent control unit 5 on the top of the contactor identifies the on-machine status, current specifications, and sealing validity of the sealing contactor through pulse signals. This implementation integrates the elevator control contactor's running contacts and sealing contacts into one unit. Through mechanical linkage, it achieves timing control of elevator operation and sealing. It is also equipped with a sealing detection intelligent control unit to prevent the sealing contactor from being replaced by a regular contactor, or from improper contactor selection, or from sealing failure when the elevator slips, which could lead to a safety accident.

[0028] Elevator operation contact unit 1 consists of three sets of double-break type normally open main contacts 101, and elevator star-sealing contact unit 2 consists of three sets of double-break type normally closed main contacts 201. The incoming terminals of elevator star-sealing contact unit 2 are shorted in a "star" shape by comb-shaped conductive busbar 202. Each phase outgoing terminal of elevator star-sealing contact unit 2 is connected in parallel with each phase outgoing terminal of elevator operation contact unit 1 by "Z" type connecting busbar 102. The double-break contact structure allows the three-phase incoming terminals of elevator star-sealing contact unit 2 to be shorted while the three-phase outgoing terminals are connected in parallel with each phase of the three-phase outgoing terminals of elevator operation contact unit 1, realizing that the permanent magnet synchronous traction motor does not seal the star when running and the star-sealing circuit is connected when stopping.

[0029] Each stationary contact of the elevator running contact unit 1, elevator sealing contact unit 2, self-locking contact unit 3, and mirror contact unit 4 is fixed on the housing 8. A guide groove is opened inside the housing 8, and the moving contact bracket 9 is set in the guide groove of the housing 8. The moving contact of each contact unit is set on the moving contact bracket 9, and the connection or disconnection between the moving contact and the stationary contact is realized through the moving contact bracket 9.

[0030] The sealing star detection intelligent control unit 5 is built into the control cover 501 on the top of the contactor. The control cover 501 has a pulse intelligent module 502 embedded inside and a detection connector 503 on the outside. The pulse intelligent module 502 is equipped with a spring terminal 504. The pulse intelligent module 502 exchanges information with the elevator control system through the detection connector 503 and the spring terminal 504 of the control cover 501, and is used to effectively detect the on-machine status, current specification and sealing effectiveness of the sealing star contactor.

[0031] The working principle of this invention is as follows:

[0032] The principle of sealing stars is as follows: Figure 7 As shown, when the elevator stops, the elevator running contact unit 1 is disconnected and the elevator star-shaped contact unit 2 is closed. The motor windings are short-circuited in a star shape through the "Z"-shaped connecting bar 102 and the comb-shaped conductive bar 202. If the brake fails at this time, the car will move unexpectedly. The motor rotor rotates and cuts the magnetic field lines, generating a reverse braking torque in the opposite direction to the car's movement. This hinders the car's acceleration and ultimately makes the car reach a uniform speed, preventing "overshooting" or "bottoming out" accidents, thus protecting passenger safety.

[0033] The principle of star-sealing detection is as follows Figure 8As shown, the integrated intelligent star-sealed contactor for elevators incorporates a pulse intelligent module 502, which uses different pulse widths and periods to distinguish products with different current ratings. By periodically outputting PWM pulse switching signals, the elevator control system identifies these signals and determines the on-machine status of the corresponding integrated star-sealed contactor. If the elevator control system fails to detect the corresponding pulse signal for a cumulative 24 hours or receives at least two erroneous signals (pulse width and period signals inconsistent with product specifications), it issues a command to stop the elevator and brings the car to the leveling position.

[0034] The pulse intelligent module outputs an active signal. Upon initial power-up, it outputs a 20-cycle signal after a 15-second delay. Subsequently, it outputs a 20-cycle signal every hour. The pulse module is powered by DC 24V, which must be supplied by the elevator control system to ensure reliable detection of the PWM pulse signal.

[0035] The above are merely preferred embodiments of the present invention. It should be noted that, for those skilled in the art, based on the technical teachings provided by the present invention and as common knowledge in the mechanical field, other equivalent modifications and improvements can be made, which should also be considered within the scope of protection of the present invention.

Claims

1. An integrated intelligent sealing contactor for elevators, characterized in that: The device includes a solenoid DC electromagnet unit (7) and a housing (8) connected to the top of the solenoid DC electromagnet unit (7). The housing (8) has an array of guide grooves on both sides and in the middle. Moving contact brackets (9) are embedded in the guide grooves. The moving contact brackets (9) are rectangular strips with an array of moving contact mounting holes arranged side by side along the height of the moving contact brackets (9). Elevator running contact units (1) are respectively provided on the lower row of moving contact mounting holes. Self-locking contact units (3) are respectively provided in the moving contact mounting holes on both sides of the elevator running contact unit (1). At the same time, elevator sealing contact units (2) are respectively provided in the moving contact mounting holes above the elevator running contact unit (1). Mirror contact units (4) are provided on both sides of the elevator sealing contact unit (2). The bottom of the elevator running contact unit (1) is also provided with a rectification surge suppression unit (6); the upper part of the housing (8) is provided with a sealing star detection intelligent control unit (5), the sealing star detection intelligent control unit (5) includes a control cover (501) connected to the top of the housing (8), the upper part of the control cover (501) is provided with an array of detection sockets (503) arranged in parallel, and a pulse intelligent module (502) is provided inside. An array of spring terminals (504) is provided between the pulse intelligent module (502) and the detection sockets (503). The pulse intelligent module (502) exchanges information with the elevator control system through the spring terminals (504) and the detection sockets (503) to effectively detect the on-machine status, current specifications and sealing effectiveness of the sealing star contactor; The elevator running contact unit (1) includes an array of double-break type normally open main contacts (101). The output end of the elevator running contact unit (1) and the output end of the elevator sealing star contact unit (2) are connected in parallel through a "Z" type connecting bar (102). The elevator sealing star contact unit (2) includes an array of double-break type normally closed main contacts (201). The input end of the elevator sealing star contact unit (2) is shorted in a "star" shape by a comb-shaped conductive bar (202). The self-locking contact unit (3) includes an array of dual-break type normally open auxiliary contacts (301), and the mirror contact unit (4) includes an array of dual-break type normally closed auxiliary contacts (401).

2. The integrated intelligent sealing contactor for elevators according to claim 1, characterized in that: Each set of vertically arranged moving contact mounting holes on the moving contact bracket (9) is opened on a separate cylindrical shell, and a groove adapted to the shape of the guide groove is provided between each set of cylindrical shells to facilitate the moving contact bracket (9) and the guide groove to be fitted together.

3. The integrated intelligent sealing contactor for elevators according to claim 1 or 2, characterized in that: The elevator running contact unit (1), elevator sealing contact unit (2), self-locking contact unit (3), and mirror contact unit (4) also include an array of static contacts set on the housing (8).

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