Teflon pipe cutting control circuit system

Abstract

The utility model discloses a teflon pipe cutting control circuit system, comprising a three-phase power supply which is connected to a system through a main circuit breaker QF; the system comprises a cutting motor control loop and a sequence control loop. The cutting motor control loop comprises a contactor KM1, a contactor KM2, a thermal relay FR and a cutting motor M; the sequential control loop comprises a cutter downward moving control unit, a cutter upward moving control unit and a polytetrafluoroethylene pipe conveying control unit; the cutter downward moving control unit is used for controlling the cutting motor to work to drive the cutter to move downwards to cut the polytetrafluoroethylene pipe; the cutter upward movement control unit is used for controlling upward movement and resetting of the cutter; and the teflon pipe conveying control unit is used for controlling the teflon pipe to be pushed forwards by a fixed distance. The teflon pipe cutting control circuit system has the advantages that the consistency of the teflon pipe cutting process can be guaranteed, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to industrial automation control equipment, in particular to a polyfluoro tube cutting control circuit system, which is applied to the automated processing and production of polyfluoro tubes in the chemical, electronic, mechanical and other industries. Background Art

[0002] Teflon tubing, also known as polytetrafluoroethylene tubing (PTFE tubing), is widely used in the chemical, electronics, aerospace, biomedicine, and other fields due to its excellent corrosion resistance, high temperature resistance, insulation, and low friction coefficient. In industrial production, long strips of PTFE tubing need to be cut into sections of specific lengths for use as connectors in various equipment and systems.

[0003] Traditional PTFE tube cutting mainly adopts manual or semi-automatic methods, which have the following problems: first, manual operation of cutting equipment is inefficient and labor-intensive; second, manual control of the cutting process makes it difficult to ensure consistent cutting length.

[0004] Currently, most PTFE tube cutting equipment control systems on the market are either simple manual controls or complex PLC-based systems. The former have a low degree of automation and are cumbersome to operate; the latter offer powerful functionality but are expensive and complex to maintain. Therefore, developing a control circuit system that is affordable, easy to operate, can automatically complete the entire PTFE tube cutting process, and incorporates necessary safety protection features is of great significance. Utility Model Content

[0005] The utility model aims to provide a PTFE tube cutting control circuit system, which can automatically control the work processes such as the downward movement of the cutter for cutting, upward movement for resetting and PTFE tube transportation, thereby ensuring the consistency of the PTFE tube cutting process and improving production efficiency.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A polyfluoro tube cutting control circuit system comprises: a three-phase power supply L1, L2, L3 and a neutral line N, wherein the three-phase power supply is connected to the system via a main circuit breaker QF; the system comprises: a cutting motor control circuit and a sequential control circuit; wherein the cutting motor control circuit comprises a contactor KM1, a contactor KM2, a thermal relay FR and a cutting motor M; the sequential control circuit comprises a cutter downward movement control unit, a cutter upward movement control unit and a polyfluoro tube conveying control unit; the cutter downward movement control unit is used to control the operation of the cutting motor to drive the cutter downward to cut the polyfluoro tube; the cutter upward movement control unit is used to control the cutter upward movement and reset; the polyfluoro tube conveying control unit is used to control the polyfluoro tube to advance a fixed distance.

[0008] The utility model is further configured as follows: the cutter downward movement control unit includes: a button switch SB1, a time relay KT1 and a contactor KM1; the normally closed contact 1-2 of the time relay KT2 is connected in series with the coil of the contactor KM1, which is used to control the cutting motor M to realize the downward movement of the cutter.

[0009] The utility model is further configured as follows: the cutter upward movement control unit includes: a time relay KT2 and a contactor KM2; the coil of the time relay KT2 is connected in series with the normally open contacts 7-8 of the time relay KT1; the coil of the contactor KM2 is connected in series with the normally open contacts 5-6 of the time relay KT1, which is used to control the reverse rotation of the cutting motor to achieve the upward movement and reset of the cutter.

[0010] The present invention is further configured as follows: the PTFE tube delivery control unit comprises: an electromagnetic valve EV1; the coil of the electromagnetic valve EV1 is connected in series with the normally open contacts 9-10 of the time relay KT2.

[0011] The utility model is further configured as follows: the sequential control loop also includes a working cycle control unit, and the working cycle control unit includes a time relay KT3; the time relay KT3 is connected in series with the normally open contacts 11-12 of the time relay KT2 to control the working cycle cycle of the entire system.

[0012] The present invention is further configured such that: in the cutting motor control circuit, the main contacts 1-2 and 5-6 of the contactor KM1 and the contactor KM2 are connected in an interlocking manner to prevent the two contactors from being closed at the same time and causing a short circuit in the motor.

[0013] The present invention is further configured as follows: the system further comprises a safety protection device, wherein the safety protection device comprises a thermal relay FR for monitoring the working current of the cutting motor and cutting off the power supply in the event of an overload.

[0014] In summary, the present invention has the following beneficial effects:

[0015] 1. The system uses a sequential control loop to fully automate the cutter's downward movement for cutting, upward movement for reset, and PTFE tube delivery. The operator simply presses the start button SB1 to complete a full work cycle, significantly reducing manual operation and improving work efficiency. No human intervention is required during the cutting process, reducing the risk of operational errors and improving production safety.

[0016] 2. The system uses time relays to accurately control the cutting time and conveying position, so that the time of each cutting cycle is consistent, ensuring the uniformity of the length of the cut pipe section and improving the consistency and stability of product quality.

[0017] 3. The system uses thermal relay FR to protect the cutting motor from overload. When the motor is overloaded, it can cut off the power supply in time to prevent the motor from burning. At the same time, the main contacts of KM1 and KM2 are connected in an electrical interlocking manner, which effectively prevents the motor from reverse short circuit caused by misoperation and improves the safety of equipment operation.

[0018] 4. The system adopts button control to start, which is simple and intuitive to operate and can be operated without professional training; the coordination between the control units is automatically completed by the circuit, which reduces the skill requirements of the operator.

[0019] 5. The control circuit of the system adopts the contact signal cascade mode of time relays KT1, KT2 and KT3 to form a strict timing control, so that the cutter downward movement, cutter upward movement and PTFE tube transportation are carried out in a predetermined order, avoiding misoperation and process confusion. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is the circuit principle diagram of the PTFE tube cutting control circuit system of the utility model. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms center, longitudinal, transverse, length, width, thickness, up, down, front, back, left, right, vertical, horizontal, top, bottom, inside, outside, clockwise, counterclockwise, etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0023] like Figure 1 As shown, the PTFE tube cutting control circuit system provided by the present invention includes a three-phase power supply L1, L2, L3 and a neutral line N, which are connected to the system through a main circuit breaker QF. The system mainly consists of two parts: the cutting motor control circuit and the sequence control circuit.

[0024] The cutting motor control circuit consists of contactors KM1 and KM2, a thermal relay FR, and the cutting motor M. The cutting motor M is a three-phase asynchronous motor, with forward and reverse rotation controlled by contactors KM1 and KM2. In practice, the cutting motor drives the cutter up and down to cut the PTFE tubing. To ensure safe system operation, the main contacts 1-2 and 5-6 of contactors KM1 and KM2 are interlocked to prevent simultaneous closure of both contactors and a short circuit in the motor. The cutting motor M is also protected from overload by the thermal relay FR, which monitors the motor's operating current and automatically disconnects if overloaded, protecting the motor from damage.

[0025] The sequence control circuit mainly consists of a cutter lowering control unit, a cutter raising control unit, a PTFE tube conveying control unit, and a work cycle control unit. These are interconnected via the contacts of time relays KT1, KT2, and KT3, allowing each process to be executed in a predetermined order.

[0026] The cutter lowering control unit consists of pushbutton switch SB1, time relay KT1, and contactor KM1. After the operator places the PTFE tubing in the cutting position, they press button SB1 to activate the system. The contacts of button SB1 close. Contacts 13-14 of time relay KT3 close, normally closed contacts 1-2 of time relay KT2 close, and the coil of time relay KT1 energizes. The coil of contactor KM1 energizes, closing its main contacts and activating cutting motor M, which drives the cutter downward to cut the PTFE tubing.

[0027] The cutter upward movement control unit includes time relay KT2 and contactor KM2. When cutting is complete, normally open contacts 7-8 of time relay KT1 close, energizing the coil of time relay KT2. Normally open contacts 5-6 of time relay KT1 close, energizing the coil of contactor KM2. This closes the main contacts of contactor KM2, causing cutting motor M to reverse, driving the cutter upward and resetting. The interlocking design of contactors KM1 and KM2 ensures that KM1 is de-energized before KM2 is energized, preventing the motor from being powered simultaneously in both forward and reverse directions.

[0028] The PTFE tubing conveying control unit includes a time relay KT3 and a solenoid valve EV1. When the cutter moves upward and resets, the normally open contacts 9-10 of time relay KT2 close, energizing the coil of solenoid valve EV1. This valve then inflates the cylinder. Simultaneously, the normally open contacts 11-12 of time relay KT2 close, energizing time relay KT3. Once the cylinder's inflation pushes the PTFE tubing forward to a set position, time relay KT3 expires, resetting the entire circuit and preparing for the next cut.

[0029] The duty cycle control unit, consisting of a time relay KT3, controls the duty cycle of the entire system. When a complete cutting and conveying cycle is completed, the normally closed contacts 13-14 of the time relay KT3 are disconnected, the circuit is reset, and the next duty cycle begins, allowing the system to automatically cycle without operator intervention.

[0030] The system's workflow is as follows:

[0031] 1. Preparation stage: The operator places the PTFE tube into the feed port of the cutting equipment so that the PTFE tube is in the correct cutting position, then turns on the power and closes the main circuit breaker QF.

[0032] 2. Start phase: The operator presses the start button SB1, and the contacts of the start button close;

[0033] 3. Cutting stage: The coil of time relay KT1 is energized, the normally closed contact 1-2 of time relay KT2 is in the closed state, the coil of contactor KM1 is energized, the cutting motor M starts, and drives the cutter to move down and start cutting the PTFE tube.

[0034] 4. Cutting completed: When the cutting is completed (set by the delay parameter of the time relay KT1), the normally open contacts 5-6, 7-8 of the time relay KT1 are closed, and its normally closed contacts 1-2, 3-4 are disconnected (the contactor KM1 loses power and the cutting motor stops moving downward).

[0035] 5. Cutter reset: The coil of time relay KT2 is energized, the coil of contactor KM2 is energized, the cutting motor M reverses, and drives the cutter to move up and reset.

[0036] 6. PTFE tube transportation: At the same time, the normally open contacts 9-10 and 11-12 of the time relay KT2 are closed, the solenoid valve EV1 is energized, the cylinder is inflated, and the PTFE tube is pushed forward one position. At the same time, the time relay KT3 is energized, the timing starts and ends, so that the PTFE tube is pushed a fixed distance each time.

[0037] 7. Cycle preparation: When the entire operating cycle is completed, the normally closed contacts 13-14 of the time relay KT3 are disconnected, the circuit is reset, and the system is ready to start the next cutting cycle.

[0038] As mentioned above, time relay KT1: its delay determines the time for cutting downward, and needs to be properly adjusted according to the material, diameter and thickness of the PTFE tube to ensure thorough cutting.

[0039] Time relay KT2: Its delay controls the time for the cutter to move up, so that the cutter can completely return to its original position and prepare for the next cutting.

[0040] Time relay KT3: Its delay affects the coordination of the entire working cycle, including the confirmation of the PTFE tube in place and the timing of starting the next cycle.

[0041] The delay parameter of the time relay can be fine-tuned by adjusting the knob on the relay to meet the cutting requirements of PTFE tubes of different specifications and achieve the best cutting effect.

[0042] The control circuit of the utility model adopts a full relay logic control structure, does not rely on a complex programmable controller, realizes automatic control function through contact state conversion and time relay delay, and has the characteristics of simple structure, low failure rate and easy maintenance.

[0043] Compared with traditional manual operation or complex PLC control systems, this utility model has the following advantages: first, the degree of automation is moderate, which avoids the inefficiency and instability of manual operation and has low cost; second, the system operation is simple, and the entire work cycle can be completed by simply pressing the start button, which reduces the skill requirements for the operator.

[0044] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A PTFE tube cutting control circuit system, characterized in that: include: Three-phase power supply L1, L2, L3 and neutral line N, the three-phase power supply is connected to the system through the main circuit breaker QF; the system includes: a cutting motor control circuit and a sequential control circuit; wherein, the cutting motor control circuit includes contactor KM1, contactor KM2, thermal relay FR and cutting motor M; the sequential control circuit includes a cutter downward movement control unit, a cutter upward movement control unit and a PTFE tube conveying control unit; the cutter downward movement control unit is used to control the operation of the cutting motor to drive the cutter downward to cut the PTFE tube; the cutter upward movement control unit is used to control the cutter upward movement reset; the PTFE tube conveying control unit is used to control the PTFE tube to advance a fixed distance.

2. The PTFE tube cutting control circuit system according to claim 1, characterized in that: The cutter downward movement control unit includes: a button switch SB1, a time relay KT1 and a contactor KM1; the normally closed contact 1-2 of the time relay KT2 is connected in series with the coil of the contactor KM1 to control the cutting motor M to realize the downward movement of the cutter.

3. The PTFE tube cutting control circuit system according to claim 1, characterized in that: The cutter upward movement control unit includes: a time relay KT2 and a contactor KM2; the coil of the time relay KT2 is connected in series with the normally open contacts 7-8 of the time relay KT1; the coil of the contactor KM2 is connected in series with the normally open contacts 5-6 of the time relay KT1, which is used to control the reverse rotation of the cutting motor to achieve the upward movement and reset of the cutter.

4. The PTFE tube cutting control circuit system according to claim 1, characterized in that: The PTFE tube transport control unit includes: an electromagnetic valve EV1; the coil of the electromagnetic valve EV1 is connected in series with the normally open contact 9-10 of the time relay KT2.

5. The PTFE tube cutting control circuit system according to claim 1, characterized in that: The sequential control loop also includes a working cycle control unit, which includes a time relay KT3; the time relay KT3 is connected in series with the normally open contacts 11-12 of the time relay KT2 to control the working cycle of the entire system.

6. The PTFE tube cutting control circuit system according to claim 1, characterized in that: In the cutting motor control circuit, the main contacts 1-2 and 5-6 of the contactor KM1 and the contactor KM2 are connected in an interlocking manner to prevent the two contactors from being closed at the same time, thereby preventing the motor from being short-circuited.

7. The PTFE tube cutting control circuit system according to claim 1, characterized in that: The system further comprises a safety protection device, which comprises a thermal relay FR for monitoring the working current of the cutting motor and cutting off the power supply in the event of an overload.

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