Electric rotary drive device

Abstract

The present invention relates to an electric rotary drive device, which uses a DC motor as a rotation power source, reaches a working speed and a working torque through a reducer, and a vehicle sends a "running position-connection position" command or a "connection position-running position" command. A control unit receives the command and judges that it is normal through internal logic, and drives a grounding arm to rotate from the running position to the connection position or from the connection position to the running position. When the action is in place, the device automatically stops and triggers a "connection position" feedback signal or a "running position" feedback signal to the vehicle, thereby realizing the opening and closing operation of a high-voltage grounding switch; the high-voltage grounding switch can be driven safely and reliably even when the electric locomotive is not equipped 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 high-voltage boxes of electric locomotives, urban rail vehicles and EMUs currently generally use an electrically controlled pneumatic drive mode, relying on a pneumatic rotary drive device to convert the pressure energy of compressed air into mechanical energy, output torque to enable the mechanism to swing back and forth, and drive the grounding arm to perform a rotary motion of opening and closing the switch.

[0003] At present, there are two main types of high-voltage grounding switches used in electric locomotives and EMUs: one is manual operation. When the staff performs inspection and maintenance, they manually operate the high-voltage grounding switch handle inside the car or outside the cabinet to switch the high-voltage grounding switch from the "running position" to the "grounding position" to achieve the grounding of the circuits on both sides of the main circuit breaker. This method can visually observe the status of the grounding switch and does not rely on mechanical equipment. In an emergency, manual operation can quickly respond to reduce the risk of accidents. However, the manual operation method is dangerous, laborious, and troublesome. In some harsh working environments, manual operation has certain risks;

[0004] The other is pneumatic control, 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, or directly uses a rotary cylinder to operate the rotating arm to perform circular motion, so as to realize the automatic conversion between the "running position" and the "engagement position". This method realizes pneumatic control through a simple button or switch, without the operator directly contacting the high-voltage components, and can work stably in high temperature, low temperature, humid or dusty and corrosive gas environments. However, the pneumatic system requires a stable supply of compressed air and requires regular maintenance, and is not suitable for electric locomotives with strict space and weight restrictions.

[0005] Under 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 is also not possible due to safety issues. Summary of the invention

[0006] 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 earthing 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 earthing switches.

[0007] To achieve the above-mentioned object, 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 DC brushless motor driver and a DC brushless motor, the control circuit comprises 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 comprises 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 comprises 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;

[0008] 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;

[0009] 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;

[0010] 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;

[0011] 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;

[0012] 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.

[0013] Preferably, the EN port of the brushless DC motor driver is connected to contacts 5 and 4 of the intermediate relay KA1, the contact 9 of the intermediate relay KA1 is connected to 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 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.

[0014] Preferably, the U, V, W ports of the brushless DC motor driver are respectively connected to the U, V, 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] 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 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 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.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. When the grounding switch is in the "running position", the device provided by the present invention cuts off the power through the relay after the "grounding position"-"running position" is rotated to the right position, cutting off the power supply of the driver. Compared with the existing technology of not cutting off the power after the position is in place, it can better ensure the safe operation of the electric locomotive;

[0018] 2. The grounding switch is in the "running 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 misoperating during the train operation. In addition, the device provided by the present invention simplifies the product wiring, and the reduction of components can reduce risks and improve reliability.

[0019] 3. The electric rotary device provided by the present invention can complete the opening and closing operations of the high-voltage grounding switch without a wind source system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the electrical schematic diagram of the control circuit of the control unit of the present invention;

[0021] Figure 2This is the electrical schematic diagram of the main circuit of the control unit of the present invention;

[0022] Figure 3 This is a working diagram of the cam of the present invention in the running position;

[0023] Figure 4 This is a working diagram of the cam of the present invention in the engagement position;

[0024] Figure 5 (a) is a schematic diagram of the operation of the present invention from "operating position to connection position";

[0025] Figure 5 (b) is a diagram of the switch levels of the "running position-connection position" of the present invention;

[0026] Figure 6 (a) is a schematic diagram of the operation of the present invention from "connection position to operation position";

[0027] Figure 6 (b) is a diagram of the switch levels of the present invention from "connection position to operation position". DETAILED DESCRIPTION

[0028] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0029] In order to ensure the normal operation of the high-voltage grounding switch in an electric locomotive without 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 column; the mounting frame, as a bearing mechanism of the device, is integrally formed by 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 accident; the cam frame is installed at the rear end of the motor, connected to the front mounting frame through the support column, and a cam is assembled on the transmission shaft. After the rotation angle of the cam is accurately calculated and matched with multiple groups of quick-acting switches, the on-off of the motor control signal and the output of the feedback signal are realized; a rotating bearing is provided at the end of the cam frame to enhance the stability of the movement;

[0030] Attached Figure 1 and attached Figure 2Combined with the overall circuit diagram of the present application, the control unit includes a main circuit, a control circuit and an in-place 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 +55V-1+ and -55V-1- control power supplies and +55V-2+ and -55V-2- control power supplies, and the in-place 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;

[0031] 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 running limit switch SQ1, and the contact 4 of the running limit switch SQ1 is connected to the L2 port of the DC brushless motor driver;

[0032] Cam 1 is connected to feedback switch SQ5, cam 2 is connected to feedback switch SQ3 and feedback switch SQ4, cam 3 is connected to running limit switch SQ1 and grounding limit switch SQ2;

[0033] When the grounding switch is in the running position, the two-position switch is toggled to issue the "run-grounding" command, and the +55V-2+ and -55V-2- control power supplies are connected. The positive pole of the power supply +55V-2+ is connected to the L1 port of the DC brushless motor driver through the second diode D2, and -55V-2- is connected to the L2 port of the DC brushless motor driver, and the driver is powered on and in standby mode; at this time, the 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 running control" can be connected. At the same time, the motor forward / reverse control signal is disconnected, and the motor immediately rotates from the running position to the grounding position;

[0034] When the brushless DC motor rotates to the grounding position, cam 3 triggers contacts 3 and 4 of the grounding limit switch SQ2 and disconnects the EN signal. The brushless DC motor driver controls the brake to stop. At this time, the L1 and L2 ports of the driver are both connected and still in the power-on standby state.

[0035] 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 direction grounding-operation action;

[0036] When the grounding switch is in the grounding position, the two-position switch is toggled to issue a "grounding-running" command, and the +55V-1+ and -55V-1- control power supplies are connected. One of the +55V-1+ is connected through the intermediate relay KA1 coil and the contacts 3 and 4 of the running limit switch SQ1 and then returns to -55V-1, which is the energization action of 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+ is connected to the L1 port of the DC brushless motor driver through the intermediate relay KA1 and the first diode D1, and the -55V-1- is connected to the L2 port of the driver, and the driver is powered on and on standby; at this time, the 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 running control" can be connected. At the same time, the motor forward / reverse control signal is connected, and the motor immediately rotates from the grounding position to the running position;

[0037] 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, and the driver is powered off and the brake is engaged to stop. At this time, the driver L1 and L2 ports are in a 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] The working principle of this device is as follows: the DC motor is used as the rotation power source, and the working speed and working torque are reached through the reducer. The vehicle sends out the "running position-connection position" command, and the control unit receives the command. After the internal logic judges that it is normal, the grounding arm is driven to rotate from the running position to the connection position. When the action is in place, the "connection position" feedback signal is triggered to the vehicle to achieve the grounding requirement;

[0043] On the contrary, the vehicle sends out a "grounding position-running position" command, the control unit receives the command, and after internal logic judgment is normal, it drives the grounding arm to rotate from the grounding 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.

[0044] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. 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 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.

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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