Electric rotary driving device

Abstract

The invention relates to an electric rotary driving device, which is characterized in that a direct-current motor is used as a rotating power source, the working rotating speed and the working torque are achieved through a speed reducer, a vehicle sends a'running position-grounding position 'instruction or a'grounding position-running position' instruction, and a control unit receives the instruction and judges to be normal through internal logic; the grounding arm is driven to rotate from a running position to a grounding position or rotate from the grounding position to running, when the action is in place, the machine is automatically stopped, and a grounding position feedback signal or a running position feedback signal is triggered to a vehicle, so that the opening and closing operation of the high-voltage grounding switch is realized; and the high-voltage grounding switch can be safely and reliably driven under the condition that the electric locomotive is not provided with a wind source system.

Description

Technical Field

[0001] The present invention relates to the technical field of electric operating devices, and in particular to an electric rotary drive device. Background Art

[0002] The grounding switches in the high-voltage boxes of electric locomotives, urban rail vehicles and EMUs currently generally adopt an electro-pneumatic drive mode. They rely on a pneumatic rotary drive device to convert the pressure energy of compressed air into mechanical energy, output torque to make the mechanism swing back and forth, and drive the grounding arm to perform the rotary motion of opening and closing.

[0003] Currently, there are two main types of high-voltage grounding switches used in electric locomotives and EMUs: one is manually operated. When personnel perform inspection and maintenance, they manually operate the high-voltage grounding switch handle inside the vehicle or outside the cabinet to switch the high-voltage grounding switch from the "running position" to the "grounding position", achieving grounding of the circuits on both sides of the main circuit breaker. This method allows intuitive observation of the status of the grounding switch and does not rely on mechanical equipment. In emergency situations, manual operation can quickly respond to reduce accident risks. However, manual operation is dangerous, labor-intensive, and cumbersome. In some harsh working environments, manual operation poses certain risks. The other is pneumatic operation, which uses a linear cylinder or a rotary cylinder as an actuator, and cooperates with a mechanical conversion mechanism to convert the linear motion of the cylinder into the circular motion of the rotating arm. Alternatively, the rotary cylinder is directly used to operate the rotating arm to perform circular motion, thereby realizing automatic conversion between the "running position" and the "engagement position". This method realizes pneumatic operation through a simple button or switch, without the operator having to directly contact high-voltage components. It can also work stably in high and low temperature, humid or dusty and corrosive gas environments. However, the pneumatic system requires a stable compressed air supply and regular maintenance, and is not suitable for electric locomotives with strict space and weight restrictions. In certain specific working conditions, the electric locomotive is not equipped with a wind source, and the pneumatic control mode cannot be used because of the loss of compressed air as a power source. Manual control cannot be used due to safety issues. Summary of the Invention

[0004] In view of this, the present invention provides an electric rotary drive device, which uses an electric rotary device to complete the opening and closing operations of the high-voltage grounding switch, effectively solving the problem in the prior art that electric locomotives without wind sources cannot use pneumatic and manual control methods as high-voltage grounding switches.

[0005] To achieve the above objectives, the present invention provides an electric rotary drive device, comprising a mechanical unit and a control unit; the control unit comprises a main circuit, a control circuit, and an in-position feedback device; the main circuit comprises a brushless DC motor driver and a brushless DC motor; the control circuit comprises a two-position switch, an intermediate relay KA1, an operating limit switch SQ1, a first diode D1, and a second diode D2; the two-position switch comprises +55V-1+ and -55V-1- control power supplies and +55V-2+ and -55V-2- control power supplies; the in-position feedback device comprises cam 1, cam 2, cam 3, a ground limit switch SQ2, a feedback switch SQ3, a feedback switch SQ4, and a feedback switch SQ5; The positive electrode of the control power supply +55V-1+ is connected to contacts 1 and 6 of the intermediate relay KA1, the positive electrode of the control power supply +55V-2+ is connected to the positive electrode of the second diode D2, the negative electrode of the control power supply -55V-2- is connected to the negative electrode of the control power supply -55V-1- and connected to the L2 port of the DC brushless motor driver, the contact 8 of the intermediate relay KA1 is connected to the positive electrode of the first diode D1, the negative electrode of the first diode D1 is connected to the negative electrode of the second diode D2 and connected to the L1 port of the DC brushless motor driver, the contact 2 of the intermediate relay KA1 is connected to the contact 3 of the operation limit switch SQ1, and the contact 4 of the operation limit switch SQ1 is connected to the L2 port of the DC brushless motor driver; The cam 1 is connected to the limit switch SQ5, the cam 2 is connected to the feedback switch SQ3 and the feedback switch SQ4, and the cam 3 is connected to the running limit switch SQ1 and the grounding limit switch SQ2; When the brushless DC motor rotates to the grounding position, the cam 3 triggers the contacts 3 and 4 of the grounding limit switch SQ2 and disconnects the EN signal, and the brushless DC motor driver controls the brake to stop. During the rotation of the brushless DC motor, the cam 3 triggers the closing of contacts 3 and 4 of the operating limit switch SQ1; When the brushless DC motor rotates to the running position, the cam 3 triggers the contacts 3 and 4 of the running limit switch SQ1 and disconnects the +55V-1+ and -55V-1- control power supplies, and the cam 3 triggers the contacts 3 and 4 of the grounding limit switch SQ2 to close.

[0006] Preferably, the EN port of the brushless DC motor driver is connected to the contacts 5 and 4 of the intermediate relay KA1, the contact 9 of the intermediate relay KA1 is connected to the contact 3 of the grounding limit switch SQ2, the contact 4 of the grounding limit switch SQ2 and the contact 12 of the intermediate relay KA1 are connected to the COM port of the brushless DC motor driver; the F / R port of the brushless DC motor driver is connected to the contact 3 of the intermediate relay KA1, and the contact 11 of the intermediate relay KA1 is connected to the COM port of the brushless DC motor driver.

[0007] Preferably, the U, V, and W ports of the brushless DC motor driver are respectively connected to the U, V, and W ports of the brushless DC motor, the HGND, HA, HB, HC, and HVCC ports of the brushless DC motor driver are respectively connected to the HGND, HA, HB, HC, and HVCC ports of the brushless DC motor, and the P and B ports of the brushless DC motor driver are respectively connected to the P and B ports of the brushless DC motor.

[0008] Preferably, the mechanical unit includes a brushless DC motor, a mounting frame, a transmission shaft, a cam frame, and a support. The mounting frame is installed under the base plate of the vacuum circuit breaker and is provided with a mechanical limit device. The cam frame is installed at the tail end of the motor and is connected to the front mounting frame through a support. A cam is assembled on the transmission shaft and cooperates with multiple sets of quick-acting switches. A rotating bearing is provided at the end of the cam frame.

[0009] Compared with the prior art, the present invention has the following beneficial effects: When the grounding switch is in the "running position", the device provided by the present invention cuts off the power supply to the driver through the relay after the grounding switch is rotated from the "grounding position" to the "running position". Compared with the existing technology that does not cut off the power supply after the position is reached, it can better ensure the safe operation of the electric locomotive. The grounding switch is in the "run" position for a long time, and the power supply is continuously supplied. However, the power supply of the electric rotary device is cut off by the limit microswitch driving the relay, so that the circuit after the relay is in a power-off state, which ensures the life of the components and prevents the driver from malfunctioning during train operation. In addition, the device provided by the present invention simplifies product wiring, and the reduction of components can reduce risks and improve reliability. The electric rotary device provided by the present invention can complete the opening and closing operations of the high-voltage grounding switch in the absence of a wind source system. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 is an electrical schematic diagram of a control circuit of a control unit of the present invention; Figure 2 This is the electrical schematic diagram of the main circuit of the control unit of the present invention; Figure 3 This is a working diagram of the cam of the present invention in the running position; Figure 4 This is a working diagram of the cam of the present invention in the engagement position; Figure 5 (a) is a schematic diagram of the operation of the present invention from "operating position to connecting position"; Figure 5 (b) is a diagram of the switch levels of the "running position-connection position" of the present invention; Figure 6 (a) is a schematic diagram of the operation of the present invention from "connection position to operation position"; Figure 6 (b) is a diagram of the switch levels of the present invention from "connection position to operation position". DETAILED DESCRIPTION

[0011] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0012] In order to ensure the normal operation of a high-voltage grounding switch in an electric locomotive not equipped with a wind source device, the present invention provides an electric rotary drive device, including a mechanical unit and a control unit; the mechanical unit includes a brushless DC motor, a mounting frame, a transmission shaft, a cam frame, and a support. The mounting frame, as the supporting structure of the device, is integrally formed from 40Cr material and integrates motor mounting, transmission mounting, and rotating bearing mounting. The mounting frame is installed under the bottom plate of the vacuum circuit breaker and is provided with a mechanical limit device to prevent the motor from rotating beyond the limit in an unexpected situation; the cam frame is installed at the rear end of the motor and connected to the front mounting frame through the support. A cam is assembled on the transmission shaft. The rotation angle of the cam is accurately calculated and coordinated with multiple sets of quick-acting switches to realize the on-off of the motor control signal and the output of the feedback signal; the end of the cam frame is provided with a rotating bearing to enhance the stability of the movement; Attachment Figure 1 and attached Figure 2 Combined with the overall circuit diagram of the present application, the control unit includes a main circuit, a control circuit and an in-position feedback device; the main circuit includes a brushless DC motor driver and a brushless DC motor, the control circuit includes a two-position switch, an intermediate relay KA1, an operating limit switch SQ1, a first diode D1, and a second diode D2. The two-position switch includes +55V-1+ and -55V-1- control power supplies and +55V-2+ and -55V-2- control power supplies. The in-position feedback device includes cam 1, cam 2, cam 3, a ground limit switch SQ2, a feedback switch SQ3, a feedback switch SQ4, and a feedback switch SQ5; The positive electrode of the control power supply +55V-1+ is connected to contacts 1 and 6 of the intermediate relay KA1, the positive electrode of the control power supply +55V-2+ is connected to the positive electrode of the second diode D2, the negative electrode of the control power supply -55V-2- is connected to the negative electrode of the control power supply -55V-1- and connected to the L2 port of the DC brushless motor driver, contact 8 of the intermediate relay KA1 is connected to the positive electrode of the first diode D1, the negative electrode of the first diode D1 is connected to the negative electrode of the second diode D2 and connected to the L1 port of the DC brushless motor driver, contact 2 of the intermediate relay KA1 is connected to contact 3 of the operation limit switch SQ1, and contact 4 of the operation limit switch SQ1 is connected to the L2 port of the DC brushless motor driver; Cam 1 is connected to feedback switch SQ5, cam 2 is connected to feedback switch SQ3 and feedback switch SQ4, and cam 3 is connected to running limit switch SQ1 and grounding limit switch SQ2; When the grounding switch is in the run position, toggle the two-position switch to issue the "run-ground" command, connect the +55V-2+ and -55V-2- control power supplies, and connect the positive pole +55V-2+ of the power supply to the L1 port of the DC brushless motor driver through the second diode D2, and connect the -55V-2- to the L2 port of the DC brushless motor driver. The driver is powered on and in standby mode. At this time, contacts 3 and 4 of the grounding limit switch SQ2 are connected, the intermediate relay KA1 loses power, and the EN signal of the "motor run control" can be connected. At the same time, the motor forward / reverse control signal is disconnected, and the motor immediately rotates from the run position to the grounding position. When the brushless DC motor rotates to the ground position, cam 3 triggers contacts 3 and 4 of the ground limit switch SQ2 and disconnects the EN signal. The brushless DC motor driver controls the brake to stop the motor. At this time, the L1 and L2 ports of the driver are both connected and still in the energized standby state. During the rotation of the brushless DC motor, cam 3 triggers the closing of contacts 3 and 4 of the operating limit switch SQ1, preparing for the reverse ground-to-operation action; When the grounding switch is in the connected position, toggle the two-position switch to issue the "grounding-run" command, connecting the +55V-1+ and -55V-1- control power supplies. One of the +55V-1+ circuits passes through the intermediate relay KA1 coil and contacts 3 and 4 of the run limit switch SQ1 and then returns to -55V-1, energizing the intermediate relay KA1. At this time, the normally open contact of the intermediate relay KA1 is closed and the normally closed contact is disconnected; the other +55V-1+ circuit passes through the intermediate relay KA1 and the first diode D1 and is connected to the L1 port of the brushless DC motor driver, while the -55V-1- circuit is connected to the L2 port of the driver, and the driver is powered and in standby mode; at this time, contacts 3 and 4 of the grounding limit switch SQ2 are disconnected, the intermediate relay KA1 is energized, and the EN signal of the "motor run control" can be connected. At the same time, the motor forward / reverse control signal is connected, and the motor immediately rotates from the connected position to the run position; When the brushless DC motor rotates to the running position, cam 3 triggers contacts 3 and 4 of the running limit switch SQ1 and disconnects the +55V-1+ and -55V-1- control power supplies. The driver is powered off and the brake is engaged to stop. At this time, the driver L1 and L2 ports are in the power-off state; during the rotation process, cam 3 triggers contacts 3 and 4 of the grounding limit switch SQ2 to disconnect, preparing for the reverse direction running - grounding action.

[0013] The EN port of the brushless DC motor driver is connected to contacts 5 and 4 of the intermediate relay KA1, contact 9 of the intermediate relay KA1 is connected to contact 3 of the ground limit switch SQ2, contact 4 of the ground limit switch SQ2 and contact 12 of the intermediate relay KA1 are connected to the COM port of the brushless DC motor driver; the F / R port of the brushless DC motor driver is connected to contact 3 of the intermediate relay KA1, and contact 11 of the intermediate relay KA1 is connected to the COM port of the brushless DC motor driver.

[0014] The U, V, and W ports of the brushless DC motor driver are respectively connected to the U, V, and W ports of the brushless DC motor, the HGND, HA, HB, HC, and HVCC ports of the brushless DC motor driver are respectively connected to the HGND, HA, HB, HC, and HVCC ports of the brushless DC motor, and the P and B ports of the brushless DC motor driver are respectively connected to the P and B ports of the brushless DC motor.

[0015] Due to the unidirectional conductivity of the diode, the two groups of control power supplies +55V-1+ and -55V-1-, +55V-2+ and -55V-2- will not interfere with each other in the motor driver through the first diode D1 and the second diode D2.

[0016] The brushless DC motor driver uses DBLS-04-S, the intermediate relay KA1 uses D-U204-KLC, and the running limit switch SQ1 and the grounding limit switch SQ2 use S826AL.

[0017] The working principle of this device is as follows: a DC motor is used as the rotational power source, which reaches the working speed and working torque through a reducer. The vehicle issues a "running position-grounding position" command. The control unit receives the command, determines that it is normal based on the internal logic, and drives the grounding arm to rotate from the running position to the grounding position. When the action is in place, a "grounding position" feedback signal is triggered to the vehicle, achieving the grounding requirement. On the contrary, the vehicle sends a "touchdown position-running position" command, the control unit receives the command, and after internal logic judgment is normal, drives the grounding arm to rotate from the touchdown position to the running position. When the action is in place, it triggers the "running position" feedback signal to the vehicle to achieve the working requirements.

[0018] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An electric rotary drive device, characterized in that: It includes a control unit and a mechanical unit; the control unit includes a main circuit, a control circuit and an in-position feedback device, the main circuit includes a DC brushless motor driver and a DC brushless motor, the control circuit includes a two-position switch, an intermediate relay KA1, an operation limit switch SQ1, a first diode D1, and a second diode D2, the two-position switch includes a +55V-1+ and -55V-1- control power supply and a +55V-2+ and -55V-2- control power supply, and the in-position feedback device includes a cam 1, a cam 2, a cam 3, a ground limit switch SQ2, a feedback switch SQ3, a feedback switch SQ4, and a feedback switch SQ5; The positive electrode +55V-1+ of the control power supply is connected to the contact 1 and the contact 6 of the intermediate relay KA1, the positive electrode +55V-2+ of the control power supply is connected to the positive electrode of the second diode D2, the negative electrode -55V-2- of the control power supply is connected to the negative electrode -55V-1- of the control power supply and connected to the L2 port of the DC brushless motor driver, the contact 8 of the intermediate relay KA1 is connected to the positive electrode of the first diode D1, the negative electrode of the first diode D1 is connected to the negative electrode of the second diode D2 and connected to the L1 port of the DC brushless motor driver, the contact 2 of the intermediate relay KA1 is connected to the contact 3 of the operation limit switch SQ1, and the contact 4 of the operation limit switch SQ1 is connected to the L2 port of the DC brushless motor driver; The cam 1 is connected to the feedback switch SQ5, the cam 2 is connected to the feedback switch SQ3 and the feedback limit switch SQ4, and the cam 3 is connected to the operation limit switch SQ1 and the grounding limit switch SQ2; When the brushless DC motor rotates to the grounding position, the cam 3 triggers the contacts 3 and 4 of the grounding limit switch SQ2 and disconnects the EN signal, and the brushless DC motor driver controls the brake to stop; During the rotation of the brushless DC motor, the cam 3 triggers the closing of contacts 3 and 4 of the operating limit switch SQ1; When the brushless DC motor rotates to the running position, the cam 3 triggers the contacts 3 and 4 of the running limit switch SQ1 and disconnects the +55V-1+ and -55V-1- control power supplies, and the cam 3 triggers the contacts 3 and 4 of the grounding limit switch SQ2 to close.

2. The electric rotary drive device according to claim 1, characterized in that: The EN port of the brushless DC motor driver is connected to the contacts 5 and 4 of the intermediate relay KA1, the contact 9 of the intermediate relay KA1 is connected to the contact 3 of the ground limit switch SQ2, the contact 4 of the ground limit switch SQ2 and the contact 12 of the intermediate relay KA1 are connected to the COM port of the brushless DC motor driver; the F / R port of the brushless DC motor driver is connected to the contact 3 of the intermediate relay KA1, and the contact 11 of the intermediate relay KA1 is connected to the COM port of the brushless DC motor driver.

3. The electric rotary drive device according to claim 2, characterized in that: The U, V, and W ports of the brushless DC motor driver are respectively connected to the U, V, and W ports of the brushless DC motor, the HGND, HA, HB, HC, and HVCC ports of the brushless DC motor driver are respectively connected to the HGND, HA, HB, HC, and HVCC ports of the brushless DC motor, and the P and B ports of the brushless DC motor driver are respectively connected to the P and B ports of the brushless DC motor.

4. The electric rotary drive device according to claim 1, characterized in that: The control unit sends the command issued by the vehicle to the mechanical unit, and the mechanical unit includes a brushless DC motor, a mounting frame, a transmission shaft, a cam frame, and a pillar. The mounting frame is installed under the bottom plate of the vacuum circuit breaker and is provided with a mechanical limit device. The cam frame is installed at the rear end of the motor and is connected to the front mounting frame through the pillar. A cam is assembled on the transmission shaft and cooperates with multiple sets of quick-acting switches. A rotating bearing is provided at the end of the cam frame.

5. The electric rotary drive device according to claim 1, characterized in that: The brushless DC motor driver uses DBLS-04-S, the intermediate relay KA1 uses D-U204-KLC, and the running limit switch SQ1 and the grounding limit switch SQ2 use S826AL.

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