An overload protection adjusting device for a plastic shell circuit breaker

Abstract

The utility model discloses a kind of overload protection adjusting devices of plastic shell circuit breaker, it includes shell, shell front end slot, slot is provided with three butt joint bases, shell is fixedly provided with handle, shell inside is provided with controller, motor, switch is provided on handle and controller circuit connection, controller is connected with motor circuit, the output end of motor is connected with butt joint base, butt joint base is provided with butt joint and adjusting screw tail contact, rotate adjusting screw that is contacted with butt joint by switch control motor rotation, replace manual operation mode by the device, whole structure design is reasonable, can be carried, it is easy to operate, three-phase adjusting screw can be simultaneously rotated and adjusted, adjustment displacement is consistent, greatly improve the efficiency and precision of adjustment operation.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker equipment technology, specifically to an overload protection adjustment device for a plastic-cased circuit breaker. Background Technology

[0002] Molded case circuit breakers are equipped with overload protection adjustment devices, typically bimetallic strip thermal tripping devices. A horizontal adjusting screw is located at the top of the bimetallic strip. By rotating the adjusting screw, the horizontal position can be adjusted, thereby adjusting the overload tripping sensitivity to accommodate different overload requirements. The traditional method involves opening the molded case circuit breaker casing to expose the adjusting screw, which is then manually adjusted using a hand tool. Manual adjustment introduces errors, and since all three adjusting screws need to be adjusted one by one, it's difficult to ensure consistent displacement, resulting in low adjustment efficiency. Summary of the Invention

[0003] This utility model provides an overload protection adjustment device for a plastic-cased circuit breaker, which can be easily handheld and operated, conveniently connected to the adjustment screw, and allows for simultaneous operation of all three phases, making operation convenient and quick.

[0004] To solve the above problems, the present invention adopts the following technical solution.

[0005] An overload protection adjustment device for a plastic-cased circuit breaker includes a casing with a slot at the front end containing three connector seats. A handle is fixedly mounted on the casing. Inside the casing are a controller and a motor. A switch on the handle is connected to the controller circuit, and the controller is connected to the motor circuit. The output end of the motor is connected to the connector seats. The connector seats have connectors that contact the tail end of an adjusting screw. The switch controls the rotation of the motor, which in turn drives the adjusting screw in contact with the connectors to rotate.

[0006] The front end of the connector is provided with a cylindrical groove, the inner radius of which is larger than the radius of the adjusting screw. A flat-head knife is fixedly installed in the groove, and a flat-head groove is provided at the tail of the adjusting screw. The flat-head knife and the flat-head groove of the adjusting screw are engaged.

[0007] Furthermore, calibration indicator lines are marked on the outer wall of the connector seat. The calibration indicator lines are on the same plane as the flat-edged knife in the groove, which is convenient for operators to refer to and facilitates the docking of the connector seat and the adjusting screw during idle operation.

[0008] The housing is equipped with a rotary switch that connects to the controller, which facilitates the controller in setting the motor output speed. The rotary switch can be an 8421 encoder and is a multi-position contact switch with up to 10 positions and common pole output. It is generally used for miniaturized micro-signal multi-channel switching and frequency / position selection control.

[0009] The three connectors correspond to three adjusting screws. Each connector is connected to a motor. The three motors are connected to the controller. The controller outputs a signal, and the three motors rotate simultaneously at the same speed.

[0010] Furthermore, the motor output end connects to the connector seat and drives the connector seat to rotate. The connector seat is provided with a sliding groove, and a guide rod is provided in the sliding groove. The tail of the connector is provided with a guide groove that mates with the guide rod. The outer wall of the connector slides in contact with the sliding groove. The connector can retract into the sliding groove along the guide rod. A buffer spring is sleeved on the guide rod. One end of the buffer spring is connected to the bottom of the sliding groove, and the other end is connected to the connector. When the cylindrical slot of the connector is placed on the adjusting screw, after the flat-edged knife contacts the end face of the adjusting screw, the connector can be appropriately buffered in the opposite direction and retracted into the sliding groove. When the connector seat is rotated, when the flat-edged knife inside the connector is embedded in the flat-edged groove, the connector will move forward, which is conducive to the connector and the adjusting screw completing the mating.

[0011] Furthermore, both the guide rod and the guide groove are square structures.

[0012] Furthermore, a fixed beam is provided inside the housing, and the motor in the middle is fixedly connected to the fixed beam. The motors on both sides are mounted on the fixed beam through mounting seats. The mounting seats can slide laterally on the fixed beam. Limiting blocks are provided on both sides of the motor mounting seats on the fixed beam to limit the left and right extreme positions of the mounting seats. Similarly, the grooves on both sides of the front end of the housing are strip grooves. The two limiting blocks on both sides of the mounting seats determine the two working positions of the motor mounting seats, that is, there are two spacing settings for the joints, corresponding to the mating positions of the adjusting screws of two different product specifications.

[0013] The working process of this utility model is as follows: After connecting the connectors to the adjusting screws, the three connectors are rotated by controlling the switch to complete the simultaneous adjustment; furthermore, the number of motor rotations can be selected according to the required adjustment screw displacement, such as 3 rotations outward, which can be selected by the rotary switch on the outer casing; during operation, the three connectors of the device are horizontally sleeved on the tail end of the adjusting screw. After the tail end of the adjusting screw contacts the flat blade, the connector retracts into the sliding groove. Rotating the connector seat drives the connector to rotate. When the flat blade inside the connector is embedded in the flat groove of the adjusting screw, the connector will move forward and collide slightly to complete the connection. Then, press the handle switch until the motor rotation stops, completing the simultaneous adjustment of the three adjusting screws.

[0014] The beneficial effects of this utility model are: the device has a reasonable structural design, is portable, easy to operate, and can simultaneously rotate and adjust the three-phase adjustment screws with consistent adjustment displacement, which greatly improves the efficiency and accuracy of the adjustment operation. Attached Figure Description

[0015] Figure 1 is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the docking seat structure.

[0017] 1-Outer shell 1, 2-Handle 2, 3-Connector base 3, 4-Rotary switch 4, 5-Connector, 6-Adjusting screw 6, 7-Strip groove 7, 8-Switch, 31-Sliding groove 31, 32-Guide rod 32, 33-Buffer spring 33, 51-Cylindrical slot 51, 52-Flat blade, 53-Guide groove. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0019] An overload protection adjustment device for a plastic-cased circuit breaker includes a casing 1 with a slot at the front end. Three connector seats 3 are installed in the slot. A handle 2 is fixedly installed on the casing 1. A controller and a motor are installed inside the casing 1. A switch 8 is installed on the handle 2 and is connected to the controller circuit. The controller is connected to the motor circuit. The output end of the motor is connected to the connector seats 3. The connector seats 3 are provided with connectors that contact the tail end of the adjustment screw. The motor is rotated by controlling the switch, which in turn drives the adjustment screw that contacts the connector 5 to rotate.

[0020] The front end of the connector is provided with a cylindrical groove 51, the inner radius of which is larger than the radius of the adjusting screw. A flat blade 52 is fixedly installed in the groove, and a flat groove is provided at the tail of the adjusting screw 6. The flat blade and the flat groove of the adjusting screw 6 are engaged.

[0021] Furthermore, the outer wall of the connector 3 is marked with a calibration indicator line. The calibration indicator line and the flat blade in the groove are on the same plane for easy reference by the operator. At the beginning of the docking, refer to the indicator line and do not align the flat blade in the cylindrical groove with the adjusting screw. The connector retracts into the connector seat. By rotating the connector seat by hand, the flat blade and the adjusting screw 6 are docked. The successful docking is confirmed by the vibration feedback of the connector when the docking is successful.

[0022] The outer casing 1 is equipped with a rotary switch 4 connected to the controller, which facilitates the controller to set the output speed of the motor. The rotary switch 4 can be an 8421 encoder and is a multi-position contact switch with up to 10 positions and common pole output. It is generally used for miniaturized micro-signal multi-channel switching and frequency / position selection control.

[0023] The three connectors correspond to three adjusting screws 6. Each connector is connected to a motor. The three motors are connected to the controller. The controller outputs a signal, and the three motors rotate simultaneously at the same speed.

[0024] Furthermore, the motor output end is connected to the connector seat 3 and drives the connector seat 3 to rotate. The connector seat 3 is provided with a sliding groove 31, and a guide rod 32 is provided in the sliding groove 31. The tail of the connector is provided with a guide groove 53 that connects with the guide rod 32. The outer wall of the connector slides in contact with the sliding groove 31. The connector can be retracted into the sliding groove 31 along the guide rod 32. A buffer spring 33 is sleeved on the guide rod 32. One end of the buffer spring 33 is connected to the bottom of the sliding groove 31, and the other end is connected to the connector. The cylindrical slot 51 of the connector is placed on the adjusting screw 6. After the flat blade contacts the end face of the adjusting screw 6, the connector can be appropriately buffered in the opposite direction and retracted into the sliding groove 31. Rotating the connector seat 3, when the flat blade in the connector is embedded in the flat groove, the connector will move forward, which is conducive to the connector and the adjusting screw 6 completing the connection.

[0025] Furthermore, both the guide rod 32 and the guide groove 53 are square structures.

[0026] Furthermore, a fixed beam is provided inside the housing, and the motor in the middle is fixedly connected to the fixed beam. The motors on both sides are mounted on the fixed beam through mounting seats. The mounting seats can slide laterally on the fixed beam. Limiting blocks are provided on both sides of the motor mounting seats on the fixed beam to limit the left and right extreme positions of the mounting seats. Similarly, the grooves on both sides of the front end of the housing 1 are strip grooves 7. The two limiting blocks on both sides of the mounting seats determine the two working positions of the motor mounting seats, that is, there are two spacing settings for the joints, corresponding to the mating positions of the adjusting screws 6 of the two specifications of products.

[0027] The working process of this utility model is as follows: After the mating joint is connected to the adjusting screw 6, the three mating joints are rotated by controlling the switch to complete the simultaneous adjustment; further, the number of motor rotations can be selected according to the required displacement of the adjusting screw 6, such as rotating outward 3 times, which can be selected by the rotary switch 4 on the outer shell 1; during operation, the three mating joints of the equipment are horizontally sleeved on the tail end of the adjusting screw 6. After the tail end of the adjusting screw 6 contacts the flat blade, the mating joint retracts into the sliding groove 31. Rotating the mating joint seat 3 drives the mating joint to rotate. When the flat blade in the mating joint is embedded in the flat groove of the adjusting screw 6, the mating joint will move forward and collide slightly to complete the connection. Then, press the handle 2 switch until the motor rotation stops, completing the simultaneous adjustment of the three adjusting screws 6.

Claims

1. An overload protection regulating device for a plastic-cased circuit breaker, characterized in that: It includes an outer shell with a slot at the front end containing three connector seats. A handle is fixedly mounted on the outer shell. Inside the outer shell are a controller and a motor. A switch on the handle is connected to the controller circuit. The controller is connected to the motor circuit. The output end of the motor is connected to the connector seat. The connector seat has a connector that contacts the tail of the adjusting screw. The motor is rotated by controlling the switch, which in turn drives the adjusting screw that is in contact with the connector to rotate.

2. The overload protection regulating device for a plastic-cased circuit breaker according to claim 1, characterized in that: The front end of the connector is provided with a cylindrical groove, the inner radius of which is larger than the radius of the adjusting screw. A flat-head knife is fixedly installed in the groove, and a flat-head groove is provided at the tail of the adjusting screw. The flat-head knife and the flat-head groove of the adjusting screw are engaged.

3. The overload protection regulating device for a plastic-cased circuit breaker according to claim 2, characterized in that: The outer wall of the connector is marked with calibration indicator lines, and the calibration indicator lines are on the same plane as the flat-edged knife in the groove.

4. The overload protection regulating device for a plastic-cased circuit breaker according to claim 1, characterized in that: The outer casing is equipped with a rotary switch that is connected to the controller.

5. The overload protection regulating device for a plastic-cased circuit breaker according to claim 1, characterized in that: The three connectors correspond to three adjusting screws, each connector is connected to a motor, and the three motors are connected to the controller.

6. The overload protection regulating device for a plastic-cased circuit breaker according to claim 1, characterized in that: The motor output end is connected to the connector seat and drives the connector seat to rotate. The connector seat is provided with a sliding groove, and a guide rod is provided in the sliding groove. The tail of the connector is provided with a guide groove that connects with the guide rod. The outer wall of the connector slides in contact with the sliding groove. The connector can be retracted into the sliding groove along the guide rod. A buffer spring is placed on the outer sleeve of the guide rod. One end of the buffer spring is connected to the bottom of the sliding groove, and the other end is connected to the connector.

7. The overload protection regulating device for a plastic-cased circuit breaker according to claim 6, characterized in that: Both the guide rod and the guide groove are square structures.

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