Control circuit and film master batch suction equipment

Abstract

The utility model discloses a control circuit and film master batch suction equipment, comprising a soft starter and a neutral power supply line N. The R end, the S end and the T end of the soft starter are electrically connected with a power supply line L1, a power supply line L2 and a power supply line L3, the power supply line L1, the power supply line L2 and the power supply line L3 form three-phase power, the soft starter is provided with three output ends which are respectively a U end, a V end and a W end, and the U end, the V end and the W end are connected with the neutral power supply line N. The power supply line L3 is electrically connected with a power-on time delay type time relay KT2, the neutral power supply line N is electrically connected with a relay KA, a power-on time delay type time relay KT1 is electrically connected between the relay KA and the power-on time delay type time relay KT2, the soft starter is electrically connected with a change-over switch SA2, and the change-over switch SA2 is electrically connected with the neutral power supply line N. Compared with a frequency converter, the cost of the soft starter is lower, the soft starter is easy to install, later maintenance and repair are easier, a large amount of manpower and time can be saved, and the production efficiency of a production line is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic extrusion, in particular to a control circuit and film masterbatch suction equipment. Background Art

[0002] At present, for a biaxially oriented film production line of 3,000 to 7,000 tons, a low-power suction machine can meet normal production needs. However, for a production line with an annual output of 90,000 tons or even more, the previous low-power suction machine is stretched, so a higher-power suction machine is needed.

[0003] In the related technology, high-power suction machines are generally controlled by frequency converters. The frequency converter needs to frequently change the power supply during operation, which may cause problems such as reverse power and interference voltage to the power grid, affecting the normal use of other electrical equipment; the hardware and software control costs required for the frequency converter are high, making it difficult to use universally; the frequency converter will generate electromagnetic waves during operation, which will cause interference and harm to other equipment and people around it. Utility Model Content

[0004] The purpose of the utility model is to provide a control circuit and a film masterbatch suction device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the utility model provides the following technical solutions: a control circuit, including a soft starter and a neutral power supply line N, the soft starter has two PE pins, one of which is electrically connected to a grounding line PE, the R end, the S end, and the T end of the soft starter are electrically connected to power supply lines L1, L2, and L3, the power supply lines L1, L2, and L3 form a three-phase power supply, and the soft starter has three output terminals, namely, a U terminal, a V terminal, and a W terminal;

[0006] The power supply line L1, power supply line L2, power supply line L3, neutral power supply line N, and grounding line PE form a three-phase five-wire system. The voltage difference between each phase is 120 degrees, which realizes high-power and high-efficiency power transmission, effectively reduces the current and line resistance of the power system, and improves the safety and stability of the power system;

[0007] The power supply line L3 is electrically connected to a power-on delay type time relay KT2, the neutral power supply line N is electrically connected to a relay KA, and a power-on delay type time relay KT1 is electrically connected between the relay KA and the power-on delay type time relay KT2;

[0008] The soft starter is electrically connected to a conversion switch SA2, and the conversion switch SA2 is used to realize the conversion of the control circuit;

[0009] The power-on delay time relay KT2 serves as the pull-in control circuit of relay KA, closing the start terminal of the soft starter to form a loop, and then the soft starter drives the motor to start sucking materials.

[0010] Furthermore, an air switch QS is electrically connected between the R, S and T ends of the soft starter and the power supply lines L1, L2 and L3 to ensure the safety of the circuit and prevent short circuits. The neutral power supply line N is also connected in series with a switching switch SA1, which can be manually switched on and off.

[0011] A film masterbatch suction device, the film masterbatch suction device includes the above-mentioned control circuit and also includes a suction motor, the suction motor has U1 terminal, V1 terminal, W1 terminal and PE terminal, the U1 terminal, V1 terminal, W1 terminal and PE terminal are electrically connected to the U terminal, V terminal, W terminal and PE terminal respectively, and the conversion switch SA2 is used to control the forward and reverse rotation of the suction motor.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] (1) The power-on delay time relay KT1 can be used to set the time function to control the running time and stop time of the motor driven by the soft starter to meet the production line's requirements for the masterbatch conveying time interval.

[0014] (2) When the soft starter controls the frequent starting and stopping of the motor, it can reduce the impact of the frequent starting of high-power motors on the power grid and other equipment.

[0015] (3) The use of soft starters is less expensive than using frequency converters, and they are easy to install and maintain, which can save a lot of manpower and time and improve the production efficiency of the production line.

[0016] (4) The forward and reverse rotation of the motor can be controlled by the conversion switch SA2. When material blockage occurs, the motor can be reversed to discharge the material through the conversion switch SA2, eliminating the need for mechanical disassembly and assembly, saving a lot of time and manpower. When the suction and feeding port needs to be changed due to equipment production needs, the conversion switch SA2 can be used to switch at any time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] Example:

[0020] See also Figure 1 The utility model provides a technical solution: a control circuit, including a soft starter and a neutral power supply line N, the soft starter has two PE pins, one of which is electrically connected to a grounding line PE, the R end, S end, and T end of the soft starter are electrically connected to power supply lines L1, L2, and L3, the power supply lines L1, L2, and L3 form a three-phase power supply, and the soft starter has three output terminals, namely, a U terminal, a V terminal, and a W terminal;

[0021] The power supply line L1, the power supply line L2, the power supply line L3, the neutral power supply line N, and the grounding line PE form a three-phase five-wire circuit to provide a stable power supply for the motor;

[0022] Three fuses are set on the primary circuits of power supply lines L1, L2 and L3, and one fuse is set on the secondary circuit of power supply line L3 to ensure that power is cut off in time when a short circuit occurs in the circuit to avoid fire caused by electricity;

[0023] The power supply line L3 is electrically connected to a power-on delay type time relay KT2, the neutral power supply line N is electrically connected to a relay KA, and a power-on delay type time relay KT1 is electrically connected between the relay KA and the power-on delay type time relay KT2;

[0024] The soft starter is electrically connected to a conversion switch SA2, and the conversion switch SA2 is used to realize the conversion of the control circuit.

[0025] In this embodiment, if Figure 1 As shown, an air switch QS is electrically connected between the R, S, and T ends of the soft starter and the power supply lines L1, L2, and L3. When the current in the circuit exceeds the rated current of the air switch QS, the air switch QS will automatically disconnect, thereby playing a role in overcurrent protection.

[0026] In this embodiment, if Figure 1 As shown, the neutral power supply line N is also connected in series with a transfer switch SA1, and the transfer switch SA1 can stop the operation of the motor in an emergency. When the motor fails, the transfer switch SA1 can be closed to make the motor stop working immediately.

[0027] The utility model provides a film masterbatch suction device, which comprises the above-mentioned control circuit.

[0028] In this embodiment, if Figure 1 As shown, the film masterbatch suction equipment also includes a suction motor, which has a U1 end, a V1 end, a W1 end, and a PE end, and the U1 end, V1 end, W1 end, and PE end are electrically connected to the U end, V end, W end, and PE end respectively.

[0029] Specifically, when in use, the conversion switch SA1 is closed, and the time delay type time relay KT1 is energized to energize the relay KA, and the relay KA electrically connected to the soft starter is closed, so that the soft starter receives a start signal, and the soft starter controls the motor to work;

[0030] When the running time set by the user is reached, the normally closed contact of the power-on delay time relay KT1 is disconnected and the normally open contact is closed. At this time, the relay KA loses power, the relay KA connected to the soft starter is disconnected, the soft starter stops running, and the motor stops running. At the same time, the power-on delay time relay KT2 is energized to execute the intermittent stop time set by the user to control the time when the motor stops running. When the stop time set by the user is reached, the normally closed contact of the power-on delay time relay KT2 is disconnected. At this time, the whole circuit loses power. Since the power-on delay time relay KT1 has the feature of power-off reset, the circuit returns to the initial working process at this time, so that the motor working time and shutdown time can be controlled. This repeated cycle plays the role of automatic intermittent material suction;

[0031] The utility model allows the forward and reverse rotation of the motor to be realized by connecting the forward and reverse control circuit of the soft starter through the control circuit. When the motor is sucking materials normally, it uses forward rotation. When material blocking occurs (the feed port is blocked by too much material), the motor can be reversed and discharged through the conversion switch SA2, eliminating the need for mechanical disassembly and assembly, saving a lot of time and manpower. When the suction and feeding port needs to be changed due to equipment production needs, this conversion switch can also be used to switch at any time.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A control circuit, characterized in that: It includes a soft starter and a neutral power supply line N, wherein the R terminal, S terminal and T terminal of the soft starter are electrically connected to the power supply line L1, the power supply line L2 and the power supply line L3, wherein the power supply line L1, the power supply line L2 and the power supply line L3 form a three-phase power supply, and the soft starter has three output terminals, namely, the U terminal, the V terminal and the W terminal; The power supply line L3 is electrically connected to a power-on delay type time relay KT2, the neutral power supply line N is electrically connected to a relay KA, and a power-on delay type time relay KT1 is electrically connected between the relay KA and the power-on delay type time relay KT2; The soft starter is electrically connected to a conversion switch SA2, and the conversion switch SA2 is used to realize the conversion of the control circuit.

2. A control circuit according to claim 1, characterized in that: An air switch QS is electrically connected between the R terminal, the S terminal, the T terminal of the soft starter and the power supply line L1, the power supply line L2, and the power supply line L3.

3. A control circuit according to claim 1, characterized in that: The neutral power supply line N is further connected in series with a transfer switch SA1.

4. A control circuit according to claim 1, characterized in that: The soft starter has two PE pins, one of which is electrically connected to a ground wire PE.

5. A film masterbatch suction device, characterized in that: The film masterbatch suction device comprises the control circuit described in any one of claims 1-4.

6. The film masterbatch suction device according to claim 5, characterized in that: It also includes a suction motor, which has U1, V1, W1 and PE terminals, which are electrically connected to U, V, W and PE terminals respectively, and the conversion switch SA2 is used to control the forward and reverse rotation of the suction motor.

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