Shunt extrusion forming circuit system

Abstract

The utility model discloses a shunt extrusion forming circuit system, which comprises a three-phase power supply, a rolling mill motor control loop, a conveyor belt motor control loop and a sequence control loop, the sequential control loop comprises a rolling mill downward moving control unit, a rolling mill upward moving control unit and a conveying belt moving control unit; the rolling mill downward-moving control unit is used for controlling a rolling mill to move downwards to extrude metal materials to form a flow divider. The rolling mill upward movement control unit is used for controlling upward movement and resetting of the rolling mill; the conveying belt movement control unit is used for controlling the conveying belt to move so as to convey the next metal material to be machined to the working area. Compared with the prior art, the shunt extrusion forming circuit system has the following beneficial effects that the shunt extrusion forming circuit system can automatically control the working processes of downward movement extrusion, upward movement reset, conveying belt conveying and the like of a rolling mill, ensures the consistency and reliability of the shunt extrusion forming process, improves the production efficiency and reduces the manual operation intensity.

Description

Technical Field

[0001] The utility model relates to manufacturing equipment for electrical measurement devices, and particularly to a shunt extrusion forming circuit system, which is applied to the production process of shunts in the fields of industrial automation and power measurement. Background Art

[0002] A shunt is a precision current measurement component, which is widely used in industrial automation, power distribution, and measurement systems. The production quality of the shunt directly affects its measurement accuracy and service life, and extrusion forming is a key process in shunt production. The thin plate in the middle of the traditional shunt is the core component for measurement. For the equipment for extruding and forming the thin plate, a manual operation mode is mostly adopted. The operator needs to manually control processes such as the downward pressure, upward lift of the rolling mill, and material conveyance, which not only has low work efficiency, but also results in unstable product quality due to human factors.

[0003] The existing shunt extrusion forming system has the following problems: First, the operation process depends on manual control, and it is impossible to ensure that the pressing time and pressure of each shunt are exactly the same, resulting in large differences between product batches; Second, manual operation requires workers to repeat monotonous operations for a long time, which is easy to cause fatigue and increases the risk of operation errors.

[0004] Therefore, it has important practical value to develop a shunt extrusion forming circuit system that can automatically control the whole process of extrusion forming, ensure the consistency of product quality, improve production efficiency, and have perfect protection functions. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a shunt extrusion forming circuit system, which can automatically control the working processes such as the downward extrusion of the rolling mill, upward reset, and conveyor belt conveyance, ensure the consistency and reliability of the shunt extrusion forming process, improve production efficiency, and reduce the intensity of manual operation.

[0006] The above technical purpose of the utility model is achieved through the following technical solutions:

[0007] A shunt extrusion forming circuit system, comprising: three-phase power supplies L1, L2, and L3, which are connected to the system through a main circuit breaker QF; the system includes: a rolling mill motor control circuit, a conveyor belt motor control circuit, and a sequence control circuit; wherein, the rolling mill motor control circuit includes a contactor KM1, a thermal relay FR1, and a rolling mill motor M1; the conveyor belt motor control circuit includes a contactor KM2, a thermal relay FR2, and a conveyor belt motor M2; the sequence control circuit includes a rolling mill downward movement control unit, a rolling mill upward movement control unit, and a conveyor belt movement control unit; the rolling mill downward movement control unit is used to control the rolling mill to move downward to extrude metal materials to form a shunt; the rolling mill upward movement control unit is used to control the rolling mill to move upward for reset; the conveyor belt movement control unit is used to control the conveyor belt to move to convey the next metal material to be processed to the working area.

[0008] The present utility model is further arranged as: the rolling mill downward movement control unit includes: a push button switch SB1; the push button switch SB1 is connected with a contact 1-2, an on-delay time relay KT1, and a contactor KM1; the normally open main contact of the contactor KM1 is connected to the rolling mill motor M1, and is used to drive the rolling mill motor to work to realize the downward movement of the rolling mill.

[0009] The present utility model is further arranged as: the rolling mill upward movement control unit includes: the normally open delay contact 7-8 of the on-delay time relay KT1 is connected with an on-delay time relay KT3; the normally closed delay contact 9-10 of the on-delay time relay KT3 is connected with a contactor KM3; the normally open main contact of the contactor KM3 controls the rolling mill motor M1 to rotate reversely, realizing the upward movement and reset operation of the rolling mill.

[0010] The present utility model is further arranged as: the conveyor belt movement control unit includes: the normally open delay contact 11-12 of the on-delay time relay KT3 is connected with an on-delay time relay KT2; the normally closed delay contact 13-14 of the on-delay time relay KT2 is connected to the coil of the contactor KM2; the normally open main contact of the contactor KM2 controls the conveyor belt motor M2 to work, driving the conveyor belt to move, and conveying the next material to be processed to the working area.

[0011] The present utility model is further arranged as: the overload normally closed contacts of the thermal relay FR1 and the thermal relay FR2 are respectively connected in series with the control circuits of the rolling mill motor M1 and the conveyor belt motor M2, and are used to monitor the motor current and disconnect the circuit in case of overload, playing an overload protection role.

[0012] The present utility model is further configured such that: the sequence control circuit includes power-on delay time relays KT1, KT2, and KT3, which are used to control the timing and duration of the downward movement of the rolling mill, the upward movement of the rolling mill, and the movement of the conveyor belt, so that the entire extrusion molding process is automatically carried out according to a preset sequence and time.

[0013] The present utility model is further configured such that: the power-on delay time relays KT1, KT2, and KT3 are provided with adjustable timers, which are used to adjust the duration of the downward movement of the rolling mill according to the material characteristics and thickness requirements of shunts of different specifications.

[0014] The present utility model is further configured such that: the power-on delay time relay KT1 is provided with an adjustable timer, which is used to adjust the duration of the downward movement of the rolling mill according to the material characteristics and thickness requirements of shunts of different specifications.

[0015] The present utility model is further configured such that: the system further includes an emergency stop button SB2, and the normally closed contact of the emergency stop button SB2 is connected in series in the power supply path of the control circuit, which is used to cut off the power supply of the entire control system in case of emergency.

[0016] In summary, the present utility model has the following beneficial effects:

[0017] 1. Automatic control: The system realizes the full-automatic control of the downward extrusion of the rolling mill, the upward reset, and the conveyor belt transportation through the sequence 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. Under the traditional manual control mode, the operator needs to control the four actions of the downward movement, upward movement of the rolling mill, and material transportation respectively, while the present system only needs one button operation to automatically complete all processes.

[0018] 2. Precise timing control: The system uses power-on delay time relays KT1, KT2, and KT3 to precisely control the action time and sequence of each process, ensuring that the extrusion time of each shunt is exactly the same, and significantly improving the consistency of product quality. Compared with the traditional method that relies on the operator's experience to master the time, the consistency between product batches is improved.

[0019] 3. Overload protection function: The system protects the rolling mill motor and the conveyor belt motor against overload through the overload normally closed contacts 9596 of the thermal relay FR1 and the overload normally closed contacts of the thermal relay FR2. When the motor current exceeds the rated value, the thermal relay automatically disconnects the circuit to prevent the motor from burning out due to overload, ensuring the safety of the equipment and the continuity of production. Compared with the traditional system, the equipment failure rate is reduced by about 75%.

[0020] 4. Production efficiency improvement: The automatic control process significantly shortens the production cycle of a single shunt.

[0021] 5. Easy to operate: The system structure is clear, and the operation logic is simple. The entire workflow can be controlled only by pressing the start button SB1, which reduces the skill requirements for operators and shortens the training time for new operators. Compared with complex PLC control systems, this solution is easier to maintain and troubleshoot, reducing maintenance downtime.

[0022] 6. Cost-effective: The system adopts mature and reliable relay control technology. Compared with using PLC or other advanced control systems, it not only has a low initial investment but also lower maintenance costs, making it especially suitable for small and medium-sized enterprises.

[0023] 7. Safe and reliable: The system integrates an emergency stop function. The normally closed contact of the emergency stop button SB2 can immediately cut off the system power supply in case of an emergency, improving operation safety. At the same time, the interlock structure between contactors ensures the correctness of the action sequence and avoids equipment damage caused by incorrect operations.

[0024] 8. Strong adaptability: By adjusting the timing parameters of each power-on delay time relay, the system can flexibly adapt to the production requirements of shunts of different specifications and materials. Process parameter changes can be achieved without replacing equipment or complex adjustments, improving the flexibility and adaptability of the production line. Description of the Drawings

[0025] Figure 1 It is a circuit diagram of the shunt extrusion forming circuit system of the present utility model. Detailed Embodiment

[0026] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms center, longitudinal, transverse, length, width, thickness, upper, lower, front, rear, left, right, vertical, horizontal, top, bottom, inner, outer, clockwise, counterclockwise, etc. are based on the orientation or positional relationships shown in the drawings. They 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 thus should not be construed as a limitation of the present utility model.

[0027] In addition, the terms first and second are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with first and second may explicitly or implicitly include one or more of such features.

[0028] In the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined. In the present utility model, unless otherwise clearly specified and defined, terms such as "installation", "connection", "connection", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0030] As Figure 1 shown, the present utility model provides a shunt extrusion forming circuit system, which includes three-phase power supplies L1, L2, L3, a neutral line N, and a protective grounding wire PE. The three-phase power supply is connected to the system through the main circuit breaker QF, which is used for the control and short-circuit protection of the total power supply of the system. The system mainly consists of three parts: a rolling mill motor control circuit, a conveyor belt motor control circuit, and a sequence control circuit.

[0031] The rolling mill motor control circuit includes a contactor KM1, a thermal relay FR1, and a rolling mill motor M1. The rolling mill motor M1 is a three-phase asynchronous motor, which is used to drive the rolling mill to move up and down to complete the extrusion forming operation of metal materials. The contactor KM1 is used to control the on and off of the rolling mill motor M1, and its main contacts are connected to the motor power line, and the control coil is controlled by the start button SB1 in the sequence control circuit. The thermal relay FR1 is connected in series in the power supply circuit of the rolling mill motor, and its normally closed overload contact is disconnected when the motor is overloaded, which is used to monitor the motor current and disconnect the circuit in case of overload to protect the motor from damage.

[0032] The conveyor belt motor control circuit includes a contactor KM2, a thermal relay FR2, and a conveyor belt motor M2. The conveyor belt motor M2 is also a three-phase asynchronous motor, which is used to drive the conveyor belt to move to realize the automatic conveying of metal materials. The main contacts of the contactor KM2 control the on and off of the conveyor belt motor M2, and its control coil is controlled by the normally open time-delay contact 11-12 in the sequence control circuit. The normally closed overload contact of the thermal relay FR2 is connected in series with the conveyor belt motor M2 to provide overload protection.

[0033] The sequence control circuit is the core solution of this application, which specifically controls the working sequence and timing of the entire extrusion forming process, including three functional units: a rolling mill downward movement control unit, a rolling mill upward movement control unit, and a conveyor belt movement control unit. All the power-on delay time relays KT1, KT2, and KT3 are of the power-on delay type, that is, the coil starts timing after being powered on, and its delay contacts change state after the timing ends.

[0034] The rolling mill downward movement control unit includes a start button SB1 and a power-on delay time relay KT1. When the operator presses the start button SB1, its contacts 1-2 are in the closed state, the coil of the contactor KM1 is energized, the main contacts of the contactor KM1 are closed, the rolling mill motor M1 starts, driving the rolling mill to move downward to extrude the metal material. At the same time, the coil of the power-on delay time relay KT1 is energized and starts timing to control the downward movement time of the rolling mill. After the timing ends, the normally closed contacts 5-6 are disconnected, and the rolling mill no longer moves downward.

[0035] The rolling mill upward movement control unit includes the normally open delay contacts 7-8 of the power-on delay time relay KT1 and a power-on delay time relay KT3. When the power-on delay time relay KT1 finishes timing, its normally open delay contacts 7-8 are closed, the coil of the power-on delay time relay KT3 is energized and starts timing. The coil of the contactor KM3 is energized, the main contacts of the contactor KM3 are closed, controlling the reverse operation of the rolling mill motor M1, and the rolling mill moves upward to reset. When the timing ends, the normally closed delay contacts 9-10 are disconnected, and the rolling mill no longer moves upward.

[0036] The conveyor belt movement control unit includes the normally open delay contacts 11-12 of the power-on delay time relay KT3 and a power-on delay time relay KT2. When the rolling mill completes the upward movement reset operation, the normally open delay contacts 11-12 of the power-on delay time relay KT3 are closed, the coil of the power-on delay time relay KT2 is energized and starts timing. The coil of the contactor KM3 is de-energized at the same time, and the rolling mill motor stops running. The coil of the contactor KM2 is energized, the main contacts of the contactor KM2 are closed, the conveyor belt motor M2 starts, driving the conveyor belt to move, and transporting the next metal material to be processed to the working area of the rolling mill.

[0037] In addition, the system can also be equipped with an emergency stop button SB2 (not shown in the figure), whose normally closed contacts are connected in series in the power supply path of the control circuit. In case of an emergency, the button can be pressed to immediately cut off the power supply of the entire control system to ensure the safety of personnel and equipment.

[0038] The working process of the entire system is as follows:

[0039] Before starting work, ensure that the power connection is normal and the main circuit breaker QF is closed.

[0040] The operator presses the start button SB1, the coil of the contactor KM1 is energized, the main contacts of the contactor KM1 are closed, the rolling mill motor M1 starts, and the rolling mill starts to move downward to extrude the metal material. At the same time, the coil of the power-on delay time relay KT1 is energized and starts timing to control the extrusion time.

[0041] After the power-on delay time relay KT1 finishes timing, its normally open delay contact 7-8 closes, and the coil of the power-on delay time relay KT3 is energized and starts timing. At the same time, the coil of the contactor KM1 loses power, and the rolling mill stops moving downward. The coil of the contactor KM3 is energized, and the main contacts of the contactor KM3 close, controlling the reverse rotation of the rolling mill motor M1, and the rolling mill moves upward to reset.

[0042] After the rolling mill moves upward to complete, the normally open delay contact 11-12 of the power-on delay time relay KT3 closes, and the coil of the power-on delay time relay KT2 is energized and starts timing. The coil of the contactor KM2 is energized, and the main contacts of the contactor KM2 close, starting the conveyor belt motor M2, and the conveyor belt moves to transport the next material to be processed to the working position.

[0043] After the conveyor belt moves a specified distance, the normally closed delay contacts 13-14 and the normally closed delay contact 1-2 of the power-on delay time relay KT2 open, and the coil of the contactor KM2 loses power, and the conveyor belt motor M2 stops running. The system enters the cycle state, and the power-on delay relays KT1, KT2, and KT3 all lose power and reset, and the system starts to work in a cycle again.

[0044] The overload normally closed contacts of the thermal relay FR1 and the overload normally closed contacts of the thermal relay FR2 respectively monitor the working currents of the rolling mill motor and the conveyor belt motor. When the current exceeds the set value, the overload normally closed contacts of the thermal relay open, cutting off the power supply of the corresponding motor to protect the motor from overload damage. The main circuit breaker QF provides short-circuit protection and total power supply control functions.

[0045] The power-on delay time relays KT1, KT2, and KT3 are all equipped with adjustable timers. The operator can adjust the moving time of the rolling mill and the moving distance of the conveyor belt according to the production requirements of different specifications of shunts, and flexibly adapt to the production requirements of different products.

[0046] The utility model adopts relay control technology and precisely controls the timing and duration of each process through power-on delay time relays, realizing the automatic control of the extrusion molding process of the shunt. Compared with the traditional manual control method, it improves the production efficiency, ensures the consistency of product quality, reduces the work intensity of the operator, and at the same time has a perfect overload protection function to ensure the safety of the equipment and the continuity of production.

[0047] The utility model is particularly suitable for small and medium-sized shunt production enterprises. The system structure is simple, the cost is low, and it is easy to maintain. At the same time, it meets the basic requirements of automatic production. For the production of shunts of different specifications, only the set times of the power-on delay time relay KT1 and the power-on delay time relay KT2 need to be adjusted to flexibly adapt to the process requirements of different products, and it has good industrial application prospects.

[0048] This specific embodiment is only an interpretation of the present utility model, and it is not a limitation to the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment that do not contribute creatively as needed, but as long as it is within the scope of the claims of the present utility model, it is protected by the patent law.

Claims

1. A shunt extrusion forming circuit system, characterized in that Including: Three-phase power supplies L1, L2, and L3, which are connected to the system through the main circuit breaker QF; the system includes: a rolling mill motor control circuit, a conveyor belt motor control circuit, and a sequence control circuit; among them, the rolling mill motor control circuit includes a contactor KM1, a thermal relay FR1, and a rolling mill motor M1; the conveyor belt motor control circuit includes a contactor KM2, a thermal relay FR2, and a conveyor belt motor M2; the sequence control circuit includes a rolling mill downward movement control unit, a rolling mill upward movement control unit, and a conveyor belt movement control unit; the rolling mill downward movement control unit is used to control the rolling mill to move downward to extrude metal materials to form a shunt; the rolling mill upward movement control unit is used to control the rolling mill to move upward for reset; the conveyor belt movement control unit is used to control the conveyor belt to move to convey the next metal material to be processed to the working area.

2. The shunt extrusion forming circuit system according to claim 1, characterized in that: The rolling mill downward movement control unit includes: a push-button switch SB1; the push-button switch SB1 is connected to a contact 1-2, a power-on delay time relay KT1, and a contactor KM1; the normally open main contact of the contactor KM1 is connected to the rolling mill motor M1, and is used to drive the rolling mill motor to work to realize the downward movement of the rolling mill.

3. The shunt extrusion forming circuit system according to claim 2, characterized in that: The rolling mill upward movement control unit includes: the normally open delay contact 7-8 of the power-on delay time relay KT1, and the normally open delay contact 7-8 is connected to a power-on delay time relay KT3; the normally closed delay contact 9-10 of the power-on delay time relay KT3 is connected to a contactor KM3; the normally open main contact of the contactor KM3 controls the reverse operation of the rolling mill motor M1 to realize the upward movement and reset operation of the rolling mill.

4. The shunt extrusion forming circuit system according to claim 3, characterized in that: The conveyor belt movement control unit includes: the normally open delay contact 11-12 of the power-on delay time relay KT3, and the normally open delay contact 11-12 is connected to a power-on delay time relay KT2; the normally closed delay contact 13-14 of the power-on delay time relay KT2 is connected to the coil of the contactor KM2; the normally open main contact of the contactor KM2 controls the operation of the conveyor belt motor M2 to drive the conveyor belt to move and convey the next material to be processed to the working area.

5. The shunt extrusion forming circuit system according to claim 1, characterized in that: The overload normally closed contacts of the thermal relay FR1 and the thermal relay FR2 are respectively connected in series with the control circuits of the rolling mill motor M1 and the conveyor belt motor M2, and are used to monitor the motor current and disconnect the circuit in case of overload, playing an overload protection role.

6. The shunt extrusion forming circuit system according to claim 4, wherein: The sequence control circuit includes power-on delay time relays KT1, KT2, and KT3, which are used to control the timing and duration of the downward movement of the rolling mill, the upward movement of the rolling mill, and the movement of the conveyor belt, so that the entire extrusion forming process is automatically carried out according to the preset sequence and time.

7. The shunt extrusion forming circuit system according to claim 4, characterized in that: The power-on delay time relays KT1, KT2, and KT3 are provided with adjustable timers, which are used to adjust the duration of the downward movement of the rolling mill according to the material characteristics and thickness requirements of different specifications of shunts.

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