Electric energy metering box shell steel plate bending circuit system

Abstract

The utility model discloses an electric energy metering box shell steel plate bending circuit system which comprises a three-phase power supply, a conveying motor control loop, a liquid pump motor control loop and a sequence control loop. The sequential control loop comprises a steel plate conveying control unit, a pressing and bending control unit and an upward moving and resetting control unit; the conveying steel plate control unit is used for controlling the conveying motor to work and conveying the steel plate to a bending position; the pressing and bending control unit is used for controlling a liquid pump motor to rotate forwards and driving a hydraulic rod to press downwards to bend a steel plate; the upward movement reset control unit is used for controlling the liquid pump motor to rotate reversely and driving the hydraulic rod to move upwards and reset. The steel plate bending machine has the advantages of being capable of automatically controlling the working processes of steel plate conveying, downward pressing bending, upward moving resetting and the like, low in cost and high in bending working efficiency.

Description

Technical Field

[0001] The utility model relates to the manufacturing of electrical equipment, in particular to a steel plate bending circuit system for the shell of an electric energy metering box, which is applied to the production process of the shell of an electric energy metering box in the fields of industrial automation and power equipment manufacturing. Background Art

[0002] The electric energy metering box is an important metering and protection device in the power system, and the quality of its shell directly affects the safety and service life of the electric energy metering box. The shell of the electric energy metering box is generally formed by bending a steel plate. Traditional steel plate bending mostly adopts manual or semi-automatic operation modes. Operators need to manually control processes such as steel plate conveying, bending pressing, and resetting. Not only is the work efficiency low, but also the bending quality is unstable due to human factors.

[0003] The existing steel plate bending systems have the following problems: The operation processes of general bending systems rely on manual control, and it is impossible to ensure that the angles and positions of each bend are exactly the same, resulting in large differences between product batches. The purchase cost of intelligent bending machines using fully automated production is relatively high. Traditional methods are difficult to meet the production requirements of low cost and high quality, restricting the efficiency improvement of small and medium-sized manufacturing enterprises of electric energy metering boxes. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a steel plate bending circuit system for the shell of an electric energy metering box, which can automatically control the working processes such as steel plate conveying, downward pressing and bending, and upward moving and resetting, and has the characteristics of low cost and high bending work efficiency.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions:

[0006] A steel plate bending circuit system for the shell of an electric energy metering box includes: three-phase power supplies L1, L2, L3 and a grounding wire PE. The three-phase power supply is connected to the system through a main circuit breaker QF. The system includes: a conveying motor control circuit, a liquid pump motor control circuit, and a sequence control circuit. Among them, the conveying motor control circuit includes a contactor KM1, a thermal relay FR1, and a conveying motor M1. The liquid pump motor control circuit includes a contactor KM2, a contactor KM3, a thermal relay FR2, and a liquid pump motor M2. The sequence control circuit includes a steel plate conveying control unit, a downward pressing and bending control unit, and an upward moving and resetting control unit. The steel plate conveying control unit is used to control the operation of the conveying motor to convey the steel plate to the bending position. The downward pressing and bending control unit is used to control the forward rotation of the liquid pump motor to drive the hydraulic rod to press downward to bend the steel plate. The upward moving and resetting control unit is used to control the reverse rotation of the liquid pump motor to drive the hydraulic rod to move upward and reset.

[0007] The present utility model is further configured as follows: The conveying steel plate control unit includes: a push-button switch SB1, a time relay KT1, and a contactor KM1; the push-button switch SB1 is connected to the coil circuits of the time relay KT1 and the contactor KM1; the main contacts of the contactor KM1 are connected to the conveying motor M1, and are used to drive the conveying motor to work and convey the steel plate to the bending position.

[0008] The present utility model is further configured as follows: The time relay KT1 has a normally open contact 5-6 and a normally closed contact 3-4; when the time relay KT1 finishes delaying, its normally open contact 5-6 closes, and its normally closed contact 3-4 opens, causing the contactor KM1 to lose power, thereby stopping the conveying motor M1 from working.

[0009] The present utility model is further configured as follows: The downward pressing and bending control unit includes: a time relay KT1, a time relay KT2, and a contactor KM2; the normally open contact 5-6 of the time relay KT1 is connected to the coil circuits of the time relay KT2 and the contactor KM2; the main contacts of the contactor KM2 are connected to the liquid pump motor M2, and are used to drive the liquid pump motor to rotate forward, driving the hydraulic rod to press down to bend the steel plate.

[0010] The present utility model is further configured as follows: The time relay KT2 has a normally open contact 11-12 and a normally closed contact 7-8; when the time relay KT2 finishes delaying, its normally open contact 11-12 closes, and its normally closed contact 7-8 opens, causing the contactor KM2 to lose power, thereby stopping the liquid pump motor M2 from rotating forward.

[0011] The present utility model is further configured as follows: The upward movement and reset control unit includes: a time relay KT2, a time relay KT3, and a contactor KM3; the normally open contact 11-12 of the time relay KT2 is connected to the coil circuits of the time relay KT3 and the contactor KM3; the main contacts of the contactor KM3 are reversely connected to the liquid pump motor M2, and are used to drive the liquid pump motor to rotate reversely, driving the hydraulic rod to move upward and reset.

[0012] The present utility model is further configured as follows: The normally closed contact 1-2 of the time relay KT3 is connected in series with the entire control circuit. When the time relay KT3 finishes delaying, its normally closed contact 1-2 opens, cutting off the power supply of the entire control circuit and completing a complete bending cycle.

[0013] The present utility model is further configured as follows: The system further includes a protection unit; the protection unit includes a thermal relay FR1 and a thermal relay FR2, which are respectively used to monitor the working current of the conveying motor and the liquid pump motor and cut off the power supply in case of overload to protect the motors from damage.

[0014] The present utility model is further configured such that: the time relay KT1 is an electrified delay type relay, which is used to control the working time of the conveying motor to ensure that the steel plate is accurately conveyed to the bending position and then stops.

[0015] The present utility model is further configured such that: the time relay KT2 is an electrified delay type relay, which is used to control the forward rotation time of the liquid pump motor to ensure that the steel plate is bent at the required angle.

[0016] The present utility model is further configured such that: the time relay KT3 is an electrified delay type relay, which is used to control the reverse rotation time of the liquid pump motor to ensure that the hydraulic rod is fully lifted and reset.

[0017] The present utility model is further configured such that: the conveying motor M1 and the liquid pump motor M2 are both three-phase asynchronous motors, which are powered by three-phase power supplies L1, L2, and L3. The U1, V1, and W1 terminals of the motors are connected to the three-phase power supply through the main contacts of the thermal relay and the contactor, and the motor shell is grounded through the PE terminal to ensure the safe operation of the equipment.

[0018] In summary, the present utility model has the following beneficial effects:

[0019] Automated control: The system realizes the full-automatic control of steel plate conveying, downward pressing and bending, and upward moving and resetting through the sequential control circuit. Only the operator needs to press the start button SB1 to complete a complete working cycle, which greatly reduces the manual operation intensity and improves the work efficiency and operation convenience.

[0020] Consistent bending quality: The system uses the time relays KT1, KT2, and KT3 to accurately control the time of each process to ensure that the bending position and angle of each steel plate of the electric energy metering box shell are consistent, overcoming the problem that it is difficult to ensure consistency in manual operation and improving the product quality and precision.

[0021] Reliable safety protection: The system integrates a perfect protection mechanism, including the thermal relays FR1 and FR2 for overload protection of the motors, and the time relay KT3 for controlling the automatic reset function of the system, effectively preventing equipment damage and safety accidents.

[0022] Smooth process connection: Through the cascade control of the time relays KT1, KT2, and KT3, the system realizes the automatic connection of processes such as steel plate conveying, downward pressing and bending, and upward moving and resetting, avoiding the delay and instability of process switching in traditional manual control and improving the production efficiency and process coherence.

[0023] Simple and practical structure: The system adopts a relay logic control structure, does not rely on complex programming controllers, and realizes the automatic control function through the conversion of contact states and the time delay of time relays. The structure is simple, and it is easy to use and maintain, especially suitable for small and medium-sized enterprises manufacturing electric energy metering boxes. Description of the Drawings

[0024] Figure 1 It is the circuit schematic diagram of the steel plate bending circuit system for the outer shell of the electric energy metering box of the present utility model. Specific Embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0026] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0027] As Figure 1 shown, the steel plate bending circuit system for the outer shell of the electric energy metering box provided by the present utility model includes three-phase power supplies L1, L2, L3 and a grounding wire PE, which are connected to the system through a main circuit breaker QF. The system mainly consists of three parts: a conveying motor control circuit, a liquid pump motor control circuit, and a sequence control circuit.

[0028] The conveying motor control circuit includes a contactor KM1, a thermal relay FR1, and a conveying motor M1. The conveying motor M1 is a three-phase asynchronous motor and is connected to the three-phase power supply through the main contacts of the contactor KM1. The thermal relay FR1 is connected in series with the conveying motor to monitor the working current of the motor and automatically disconnect the circuit when the motor is overloaded to protect the motor from damage. The outer shell of the conveying motor is grounded through the PE terminal to ensure the safe operation of the equipment. The main function of the conveying motor is to drive the rollers to convey the steel plate to the bending position.

[0029] The liquid pump motor control circuit includes contactor KM2, contactor KM3, thermal relay FR2, and liquid pump motor M2. The liquid pump motor M2 is also a three-phase asynchronous motor and is connected to the three-phase power supply through the main contacts of contactor KM2 or KM3. Contactor KM2 controls the forward rotation of the liquid pump motor to drive the hydraulic rod to press down for bending the steel plate; contactor KM3 controls the reverse rotation of the liquid pump motor to drive the hydraulic rod to move upward for resetting. The thermal relay FR2 is connected in series with the liquid pump motor for overload protection. The outer shell of the liquid pump motor is grounded through the PE terminal to ensure equipment safety.

[0030] The sequence control circuit consists of a steel plate conveying control unit, a downward pressing and bending control unit, and an upward moving and resetting control unit.

[0031] The steel plate conveying control unit includes push-button switch SB1, time relay KT1, and contactor KM1. The operator presses the push-button switch SB1 to start the system, and the coils of the time relay KT1 and the contactor KM1 are energized simultaneously. The main contacts of the contactor KM1 close, and the conveying motor M1 starts to work, driving the rollers to convey the steel plate to the bending position. The time relay KT1 starts timing to control the conveying time and ensure that the steel plate stops after accurately reaching the bending position.

[0032] The downward pressing and bending control unit includes time relay KT2 and contactor KM2. When the steel plate is conveyed in place and the time delay of the time relay KT1 ends, its normally open contacts 5-6 close, and the coils of the time relay KT2 and the contactor KM2 are energized. The main contacts of the contactor KM2 close, and the liquid pump motor M2 starts to rotate forward, driving the hydraulic rod to press down for bending the steel plate. At the same time, the time relay KT2 starts timing to control the time and ensure that the steel plate is bent at the required angle.

[0033] The upward moving and resetting control unit includes time relay KT3 and contactor KM3. When the pressing is completed and the time delay of the time relay KT2 ends, its normally open contacts 11-12 close, and the coils of the time relay KT3 and the contactor KM3 are energized. The main contacts of the contactor KM3 close, and the liquid pump motor M2 starts to rotate in reverse, driving the hydraulic rod to move upward for resetting. The time relay KT3 starts timing to control the reset time and ensure that the hydraulic rod is completely moved upward for resetting.

[0034] When the reset is completed and the time delay of the time relay KT3 ends, its normally closed contacts 1-2 open, and the entire control circuit is de-energized, and the system completes a complete bending cycle. Then the above steps are repeated.

[0035] The working process of the system is as follows:

[0036] Preparation stage: The operator places the steel plate to be processed on the rollers, then turns on the power supply and closes the main circuit breaker QF, and the system is in the standby state.

[0037] Startup stage: The operator presses the push-button switch SB1, and the time relay KT1 and the contactor KM1 are energized simultaneously, and the system starts to work.

[0038] Conveying stage: The main contacts of the contactor KM1 close, and the conveying motor M1 starts to work, driving the rollers to convey the steel plate to the bending position. At the same time, the time relay KT1 starts timing.

[0039] Pressing and bending stage: When the time delay of the time relay KT1 ends, its normally open contacts 5-6 close, and the contacts 3-4 open. The relay KM1 loses power, the conveying motor M1 stops working, and the coils of the time relay KT2 and the contactor KM2 are energized. The main contacts of the contactor KM2 close, and the liquid pump motor M2 starts to rotate forward, driving the hydraulic rod to press down to bend the steel plate. At the same time, the time relay KT2 starts timing.

[0040] Lifting and resetting stage: When the time delay of the time relay KT2 ends, its normally open contacts 11-12 close, and the normally closed contacts 7-8 open. The relay KM2 is open-circuited, and the hydraulic rod no longer moves down. The coils of the time relay KT3 and the contactor KM3 are energized. The main contacts of the contactor KM3 close, and the liquid pump motor M2 starts to rotate in reverse, driving the hydraulic rod to lift and reset. At the same time, the time relay KT3 starts timing.

[0041] Reset completion stage: When the time delay of the time relay KT3 ends, its normally closed contacts 1-2 open, and the entire control circuit is de-energized, and the system completes a complete bending cycle. Then the above steps are repeated.

[0042] In addition, the time delay of the time relay KT1 determines the working time of the conveying motor, which needs to be adjusted appropriately according to the size of the steel plate and the speed of the rollers to ensure that the steel plate stops accurately at the bending position. The time delay of the time relay KT2 determines the forward rotation time of the liquid pump motor, that is, the pressing time, which needs to be adjusted appropriately according to the thickness of the steel plate and the bending angle requirements to ensure sufficient bending of the steel plate. The time delay of the time relay KT3 determines the reverse rotation time of the liquid pump motor, that is, the reset time, which needs to ensure that the hydraulic rod can be fully lifted and reset to prepare for the next bending. The time delay parameters of the above time relays can be finely adjusted by turning the knobs on the relays to adapt to the bending requirements of different specifications of steel plates and ensure the best bending effect.

[0043] The steel plate bending circuit system of the outer shell of the electric energy metering box of the present utility model adopts a relay logic control structure, does not rely on a complex programming controller, and realizes the automatic control function through the conversion of contact states and the time delay of the time relay. Compared with the traditional manual or semi-automatic bending method, the present utility model has a high degree of automation, realizes the automatic control of steel plate conveying, downward pressing and bending, and upward moving and resetting, and greatly improves the production efficiency. The present utility model can be applied to the bending processing of steel plates for the outer shells of electric energy metering boxes of various specifications. By adjusting the time delay parameters of the time relay, it can adapt to the bending requirements of steel plates of different specifications and thicknesses.

[0044] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be subject to the protection scope of the claims.

Claims

1. A steel plate bending circuit system for the shell of an electric energy metering box, characterized in that, Including: Three-phase power supplies L1, L2, L3 and a ground wire PE. The three-phase power supplies are connected to the system through a main circuit breaker QF. The system includes: a conveyor motor control circuit, a liquid pump motor control circuit and a sequence control circuit. Among them, the conveyor motor control circuit includes a contactor KM1, a thermal relay FR1 and a conveyor motor M1. The liquid pump motor control circuit includes a contactor KM2, a contactor KM3, a thermal relay FR2 and a liquid pump motor M2. The sequence control circuit includes a steel plate conveying control unit, a downward pressing and bending control unit and an upward moving and resetting control unit. The steel plate conveying control unit is used to control the operation of the conveyor motor to convey the steel plate to the bending position. The downward pressing and bending control unit is used to control the liquid pump motor to rotate forward to drive the hydraulic rod to press down and bend the steel plate. The upward moving and resetting control unit is used to control the liquid pump motor to rotate reversely to drive the hydraulic rod to move upward and reset.

2. The steel plate bending circuit system for the outer shell of the electric energy metering box according to claim 1, wherein: The steel plate conveying control unit includes: a push-button switch SB1, a time relay KT1 and a contactor KM1. The push-button switch SB1 is connected to the coil circuits of the time relay KT1 and the contactor KM1. The main contacts of the contactor KM1 are connected to the conveyor motor M1 and are used to drive the conveyor motor to operate to convey the steel plate to the bending position.

3. The steel plate bending circuit system for the outer shell of the electric energy metering box according to claim 2, wherein: The time relay KT1 has normally open contacts 5-6 and normally closed contacts 3-4. When the time delay of the time relay KT1 ends, its normally open contacts 5-6 close and its normally closed contacts 3-4 open, causing the contactor KM1 to lose power, thereby stopping the operation of the conveyor motor M1.

4. The steel plate bending circuit system for the outer shell of the electric energy metering box according to claim 3, wherein: The downward pressing and bending control unit includes: a time relay KT1, a time relay KT2 and a contactor KM2. The normally open contacts 5-6 of the time relay KT1 are connected to the coil circuits of the time relay KT2 and the contactor KM2. The main contacts of the contactor KM2 are connected to the liquid pump motor M2 and are used to drive the liquid pump motor to rotate forward to drive the hydraulic rod to press down and bend the steel plate.

5. The steel plate bending circuit system for the outer shell of the electric energy metering box according to claim 4, characterized in that: The time relay KT2 has normally open contacts 11-12 and normally closed contacts 7-8. When the time delay of the time relay KT2 ends, its normally open contacts 11-12 close and its normally closed contacts 7-8 open, causing the contactor KM2 to lose power, thereby stopping the forward rotation of the liquid pump motor M2.

6. The steel plate bending circuit system for the outer shell of the electric energy metering box according to claim 5, characterized in that: The upward moving and resetting control unit includes: a time relay KT2, a time relay KT3 and a contactor KM3. The normally open contacts 11-12 of the time relay KT2 are connected to the coil circuits of the time relay KT3 and the contactor KM3. The main contacts of the contactor KM3 are connected to the liquid pump motor M2 in reverse and are used to drive the liquid pump motor to rotate reversely to drive the hydraulic rod to move upward and reset.

7. The steel plate bending circuit system for the outer shell of the electric energy metering box according to claim 6, wherein: The normally closed contacts 1-2 of the time relay KT3 are connected in series with the entire control circuit. When the time delay of the time relay KT3 ends, its normally closed contacts 1-2 open, causing the entire control circuit to lose power and completing a complete bending cycle.

8. The steel plate bending circuit system for the outer shell of the electric energy metering box according to claim 1, characterized in that: The system further includes a protection unit; the protection unit includes a thermal relay FR1 and a thermal relay FR2, which are respectively used to monitor the operating current of the conveyor motor and the liquid pump motor and cut off the power supply in case of overload to protect the motor from damage.

9. The steel plate bending circuit system for the outer shell of the electric energy metering box according to claim 2, wherein: The time relay KT1 is an electrified delay-type relay, which is used to control the operating time of the conveyor motor to ensure that the steel plate stops after being accurately conveyed to the bending position.

10. The steel plate bending circuit system for the outer shell of the electric energy metering box according to claim 4, characterized in that: The time relay KT2 is an electrified delay-type relay, which is used to control the forward rotation time of the liquid pump motor to ensure that the steel plate is bent at the required angle; the time relay KT3 is an electrified delay-type relay, which is used to control the reverse rotation time of the liquid pump motor to ensure that the hydraulic rod is fully lifted and reset; the conveyor motor M1 and the liquid pump motor M2 are both three-phase asynchronous motors, which are powered by three-phase power supplies L1, L2, and L3. The U1, V1, and W1 terminals of the motors are connected to the three-phase power supply through the main contacts of the thermal relay and the contactor, and the motor shell is grounded through the PE terminal to ensure the safe operation of the equipment.

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