A personnel safety device for remote start-stop electric motors

Abstract

This utility model relates to the field of electric motor control technology and discloses a personnel safety protection device for remotely starting and stopping electric motors. It includes: a radar sensor for detecting the presence of moving objects near the motor; a distribution box equipped with a monitor, external power supply terminals, radar sensor terminals, and a contactor; the monitor supplies power to the contactor and radar sensor and determines whether the motor is ready for operation; the radar sensor is connected to the monitor via a power cable and radar sensor terminals, and the contactor is connected to the motor via a power cable; the external power supply terminals are connected to the monitor. This utility model, by employing protective measures on electric motors with remote start / stop functionality, can protect on-site operators during motor startup, fundamentally preventing accidents caused by misoperation leading to injury or death.

Description

Technical Field

[0001] This utility model relates to the field of electric motor control technology, specifically, it is a personnel safety protection device for remotely starting and stopping electric motors. Background Technology

[0002] Electric motors are widely used in various industries such as petroleum, coal, chemical, and agriculture. The start and stop of electric motors are usually controlled locally. When an electric motor needs to be started or stopped, the operator needs to go to the motor control column or control cabinet on site to perform the corresponding operation.

[0003] With the continuous improvement of the intelligence and automation of motor control technology and the streamlining of employees by enterprises, remote start-stop of motors is being used in more and more industries. Remote start-stop of motors allows employees to remotely control motors on the production site from indoors using tools such as computers and mobile phones, which greatly reduces the time spent by personnel on site and the waste of manual labor.

[0004] While remote start-stop of electric motors brings convenience, it also poses certain safety risks. For example, operators performing remote start-stop may not be able to ascertain whether the on-site electric motor meets the safe start-stop conditions. If on-site operators are inspecting, repairing, or rotating the electric motor and its associated rotating equipment and process pipelines, and the remote start-stop operator starts the motor, a safety accident resulting in injury or death may occur.

[0005] After reviewing relevant materials and literature, common safety protection measures at present mainly include setting up physical fences, safety warning signs, and installing audible and visual alarm devices to remind on-site operators. However, these methods mainly rely on the self-awareness and attention of personnel and cannot fundamentally solve safety hazards. In addition, these methods cannot provide timely warnings and protection when the motor is about to start. Utility Model Content

[0006] The purpose of this utility model is to provide a personnel safety protection device for remotely starting and stopping electric motors, which solves the problem that existing protection methods mainly rely on the self-awareness and attention of personnel, and cannot fundamentally solve the safety hazards.

[0007] This utility model is achieved through the following technical solution: a personnel safety protection device for remotely starting and stopping an electric motor, comprising:

[0008] Radar sensors are used to detect whether there are moving objects near the electric motor;

[0009] The distribution box is equipped with a monitor, an external power supply terminal, a radar sensor terminal, and a contactor. The monitor is used to supply power to the contactor and the radar sensor, and to determine whether the motor has the conditions for energization and operation.

[0010] The radar sensor is connected to the monitor via a power cable and radar sensor terminals. The contactor is connected to the motor via a power cable. The distribution box is equipped with a power switch. An external power supply is connected to the external power line terminal via the power switch, and the external power line terminal is connected to the monitor.

[0011] To better realize this utility model, the radar sensor is further provided as four sensors, which are arranged in a circular array around the motor.

[0012] To better realize this utility model, a waterproof sealing joint is further provided at the power cable connection, and the waterproof sealing joint is made of rubber.

[0013] To better realize this utility model, the radar sensor is further provided with a radar sensor range adjustment, which is used to adjust the detection range of a single radar sensor; the radar sensor is provided with a radar sensor delay adjustment, which is used to adjust the action delay of a single radar sensor; and the radar sensor is provided with a radar sensor detection antenna, which is encapsulated inside the radar sensor.

[0014] To better realize this utility model, the monitor is further equipped with red and green indicator lights for transmitting signals.

[0015] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0016] (1) By adopting protective measures on the motor with remote start-stop function, this utility model can protect the on-site operators during the motor start-up process and fundamentally avoid safety accidents caused by misoperation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a cross-sectional view of the radar sensor structure.

[0019] Figure 3 This is a schematic diagram of the internal structure of the distribution box.

[0020] Figure 4 This is a logic diagram for the monitor.

[0021] Figure 5 This is the overall logic diagram of this utility model.

[0022] Wherein: 1-Distribution box; 2-Radar sensor; 3-Monitor; 4-Power switch; 5-Motor; 6-Radar sensor range adjustment; 7-Radar sensor delay adjustment; 8-Radar sensor detection antenna; 9-Waterproof sealing joint; 10-External power cord terminal; 11-Radar sensor wiring terminal; 12-Contactor. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Example 1:

[0026] This embodiment provides a personnel safety protection device for remotely starting and stopping electric motors, specifically as follows: Figures 1-5As shown, the device includes: a distribution box 1, radar sensors 2, a monitor 3, a 220V power switch 4, and a motor 5. The radar sensors 2 can be arranged around the motor 5 according to actual conditions. In this embodiment, there are four radar sensors 2, arranged in a circular array around the motor 5. The radar sensors 2 are connected to the distribution box 1 via power cables. The monitor 3 in the distribution box 1 is used to determine whether the protected motor 5 has the necessary operating conditions. The power cable from the external distribution cabinet enters the distribution box 1 through a waterproof sealing joint 9 and connects to the protected motor 5. The waterproof sealing joint 9 is made of rubber. The monitor 3 can display whether the power cable from the external distribution cabinet is energized and whether the power cable from the distribution box 1 to the protected motor 5 is energized. The 220V external power supply enters the distribution box 1 through the waterproof sealing joint 9 and connects to the 220V power switch 4. When the 220V power switch 4 is in the on state, the device can operate normally; when the power switch 4 is in the off state, the device does not operate.

[0027] Radar sensor 2 is connected to distribution box 1 via a power cable. The power cable enters radar sensor 2 through waterproof sealing connector 9. The detection range of radar sensor 2 can be adjusted via radar sensor range adjustment 6, and the action delay of radar sensor 2 can be adjusted via radar sensor delay adjustment 7. Radar sensor detection antenna 8 is used to transmit signals and detect whether operators have entered the detection range of radar sensor 2. A 220V external power supply enters distribution box 1 through waterproof sealing connector 9 and is connected to power switch 4. Power switch 4 is connected to external power line terminal 10 via a power cable. External power line terminal 10 is connected to monitor 3 via a power cable, providing power to monitor 3. Radar sensor 2 is connected to radar sensor terminal 11 in distribution box 1 via a power cable. Radar sensor terminal 11 is connected to monitor 3 via a power cable. A power cable from an external distribution cabinet enters distribution box 1 through waterproof sealing connector 9 and is connected to contactor 12. Contactor 12 is connected to motor 5 via a power cable, and contactor 12 is connected to monitor 3 via a power cable.

[0028] When an operator enters the detection range of any radar sensor 2, the monitor 3 determines that the motor 5 is not ready to run. The indicator light of the corresponding radar sensor 2 on the monitor 3 turns red. At this time, a remote start command is issued, the power cable from the distribution cabinet to contactor 12 is energized, contactor 12 does not engage, and the power cable from contactor 12 to the motor 5 is de-energized, so the motor 5 does not run. When the operator leaves the detection range of all radar sensors 2, after the radar sensor 2 action delay, the indicator light of the corresponding radar sensor 2 on the monitor 3 changes from red to green, contactor 12 engages, the power cable from contactor 12 to the motor 5 is energized, and the motor 5 runs. After the motor 5 is running normally, the monitor 3 automatically disconnects the power to the radar sensors 2. At this time, when the operator enters the detection range of any radar sensor 2, the motor 5 will run normally.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A personnel safety protection device for remote start-stop electric motors, characterized in that, include: Radar sensor (2) is used to detect whether there are moving objects near the motor (5); The distribution box (1) is equipped with a monitor (3), an external power supply terminal (10), a radar sensor terminal (11), and a contactor (12). The monitor (3) is used to supply power to the contactor (12) and the radar sensor (2), and to determine whether the motor (5) has the conditions to be powered on. The radar sensor (2) is connected to the monitor (3) via a power cable and a radar sensor terminal (11). The contactor (12) is connected to the motor (5) via a power cable. A power switch (4) is provided on the distribution box (1). An external power supply is connected to an external power line terminal (10) via the power switch (4). The external power line terminal (10) is connected to the monitor (3).

2. A personnel safety device for remote start-stop electric motors according to claim 1, characterized in that: There are four radar sensors (2), which are arranged in a circular array around the motor (5).

3. A personnel safety device for remote start-stop electric motors according to claim 1, characterized in that: A waterproof sealing joint (9) is provided at the connection of the power cable, and the waterproof sealing joint (9) is made of rubber.

4. A personnel safety device for remote start-stop electric motors according to claim 1, characterized in that: The radar sensor (2) is provided with a radar sensor range adjustment (6), which is used to adjust the detection range of a single radar sensor (2); the radar sensor (2) is provided with a radar sensor delay adjustment (7), which is used to adjust the action delay of a single radar sensor (2); the radar sensor (2) is provided with a radar sensor detection antenna (8), which is encapsulated inside the radar sensor (2).

5. A personnel safety device for remote start-stop electric motors according to claim 1, characterized in that: The monitor (3) is equipped with red and green indicator lights to transmit signals.

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