阅读说明：本技术 一种医药结晶罐搅拌电机调速控制方法及其电路 (Speed regulation control method and circuit for stirring motor of medical crystallization tank ) 是由 王路波 田国法 马平 郑金铠 杨博 李艳青 于 2020-06-29 设计创作，主要内容包括：一种医药结晶罐搅拌电机调速控制方法及电路,使用变频器控制搅拌电机运转,且在该变频器内部模块及其存储的程序设置三个频率定值,使不同频率分别对应高、中、低三个转速,并利用变频器的与三个频率相对应的使能控制信号端输出控制搅拌电机的转速。该控制电路包含一个变频器,搅拌电机为变频电机,所述变频器控制该搅拌电机运转,所述变频器中设置有数个预设的频率值,所述变频器根据选通的频率值分别对应不同的转速控制搅拌电机运转,且所述变频器具有与所述频率数相对应的使能控制信号端,于所述使能控制信号端被选通时,控制该搅拌电机以对应的转速运转。简化了结晶罐的就地手动及自动调速控制,方便现场控制操作,减少投入成本。(A speed regulation control method and circuit for stirring motor of medicine crystallizing tank features that a frequency converter is used to control the stirring motor, and three frequency constants are set up in internal module of frequency converter and its stored program to make different frequencies correspond to high, medium and low rotation speeds. The control circuit comprises a frequency converter, the stirring motor is a variable frequency motor, the frequency converter controls the stirring motor to operate, a plurality of preset frequency values are arranged in the frequency converter, the frequency converter controls the stirring motor to operate corresponding to different rotating speeds according to gated frequency values, the frequency converter is provided with an enabling control signal end corresponding to the frequency number, and when the enabling control signal end is gated, the stirring motor is controlled to operate at the corresponding rotating speed. The local manual and automatic speed regulation control of the crystallizer is simplified, the field control operation is convenient, and the investment cost is reduced.)

1. A speed regulation control circuit for a stirring motor of a medical crystallization tank comprises a frequency converter, wherein the stirring motor is a variable frequency motor, and the frequency converter controls the stirring motor to operate;

the frequency converter is provided with a power input end for accessing three-phase alternating current, a driving output end is connected with the stirring motor, a main loop is formed by the stirring motor (M), the frequency converter (UF) and the three-phase alternating current, in the main loop, the alternating current power supply controls the operation of the stirring motor (M) (frequency conversion motor) through the frequency converter (UF), the frequency converter is further provided with an interlocking start-stop port, and the frequency converter controls the start-stop of the stirring motor according to the state of the interlocking start-stop port communication.

2. The circuit of claim 1, wherein the control circuit further comprises an auxiliary control module, the auxiliary control module mainly comprises an interlock start/stop switch circuit and a rotation speed selection module, the interlock start/stop switch circuit and the rotation speed selection module are formed by relays, normally open contacts of the relays respectively form a switch loop with the interlock start/stop port or the enable control signal end, one end of a relay coil is connected with a zero line, and the other end of the relay coil is connected with the interlock start/stop switch circuit or the rotation speed selection module.

3. The circuit of claim 2, wherein the number of the frequencies is three, and the number of the frequencies corresponds to three high, medium and low speeds, respectively, the auxiliary control module further comprises a time controller (KT) having four output contacts for outputting control signals, the control signals are respectively a start/stop control output signal and three speed control output signals, the start/stop and speed control output time of the time controller can be programmed according to the production process, and the start/stop control output signals respectively control the power supply of the relay coil.

4. The circuit of claim 3, wherein the time controller comprises a reset pin connected to a normally open reset Switch (SBFT), and the auxiliary control module further comprises a manual/automatic selection switch (SA 1).

5. A circuit according to claim 3, wherein the manual circuit of said interlocked start-stop switch circuit comprises a normally closed button SBF and a normally open button SBS connected in series, the other end of the start button SBS is connected to the coil of the start-stop relay KA, and the normally open end of the start-stop relay KA is connected in parallel to the start button SBS and the start-stop control terminal (KT1) such that the start-stop relay KA and the start button SBS form a self-locking start circuit.

6. The circuit according to claim 5, wherein one phase line of said AC power source is connected to power terminal L of time controller through fuse FU4, and N terminal of said time controller is connected to zero line of said power source to form a power circuit.

7. A speed regulation control method for a stirring motor of a medical crystallization tank is characterized in that a frequency converter (UF) is used for controlling the stirring motor to run, three frequency fixed values are set in an internal module of the frequency converter (UF) and a program stored in the internal module of the frequency converter (UF), different frequencies respectively correspond to a high rotating speed, a medium rotating speed and a low rotating speed, and an enabling control signal end of the frequency converter corresponding to the three frequencies is used for outputting and controlling the rotating speed of the stirring motor.

8. The method as claimed in claim 7, wherein manual start/stop buttons (SBS, SBF) and three-gear switch SA are provided in the local control box of the crystallization tank for controlling the start/stop of the motor, and the relay (KA1, KA2, KA3) is used to select the operation of the frequency converter to indicate the three-gear trigger signal to the frequency converter, so that the frequency converter UF can enter three different frequency states to control the stirring motor M to enter three-gear rotation speed.

9. The method as claimed in claim 8, wherein a time controller KT outputs a contact control signal at a control end point (KT0-KT3) at different time periods according to crystallization time periods in the production process flow, the contact control signal is connected to a start-stop control and frequency converter speed control loop, which corresponds to a start-stop and three-gear control of high, medium and low rotation speed, respectively, and the start-stop and speed control output time of the time controller is programmed according to the production process flow.

10. The method and the circuit for controlling the speed regulation of the stirring motor of the medical crystallization tank as claimed in claim 9, wherein: and the time controller restores the initial timing state of the time controller through a reset button SBFT.

Technical Field

The invention relates to the field of medicine production, in particular to a speed regulation control method and a speed regulation control circuit for a stirring motor of a medicine crystallizing tank.

Background

At present, the crystallization tank is used in the pharmaceutical industry and is multipurpose for the production process of raw material medicines. In the production process, corresponding stirring rotation speed control is usually required according to the state of a crystallized material, and at present, a frequency conversion speed regulation mode is usually adopted for rotation speed control.

The existing frequency conversion speed regulation control means generally adopts a manual regulating device arranged on site to realize the continuous regulation of the frequency of a frequency converter, or a set of complex PLC control cabinet is arranged for each crystallizing tank to realize the automatic regulation of the stirring rotating speed.

However, the first control method has high requirements on field operators, and manual operation errors are easily caused by manual frequency adjustment; in addition, the frequency modulation analog signal is easily interfered and generates signal attenuation in the transmission process, so that the adjustment frequency generates deviation. And the second mode adopts an automatic control mode, generally, a PLC system automatically adjusts the motor frequency according to data fed back by the tank monitoring instrument, but the control logic is more complex due to more characteristic parameters of materials in the tank, so that the investment cost is higher. Therefore, the inventor develops the method and the control circuit of the invention by combining the production experience accumulated in the engineering, the operation rule and the process requirement of the stirring motor of the crystallizing tank, simplifies the frequency conversion speed regulation control logic of the stirring system, better avoids the problems, also realizes two frequency conversion control modes of manual and automatic, is convenient to operate on the premise of meeting the process production requirement, controls the cost input and has higher cost performance.

Disclosure of Invention

In order to solve the above problems, the present invention provides a speed regulation control method for a stirring motor of a medical crystallization tank and a circuit thereof, so as to achieve the purpose of high cost performance by not only facilitating operation but also controlling cost input on the premise of meeting the requirements of process production.

In order to achieve the above object, the present invention provides a speed regulation control circuit for a stirring motor of a medical crystallization tank, the control circuit comprising a frequency converter, the stirring motor is a variable frequency motor, the frequency converter controls the stirring motor to operate, a plurality of preset frequency values are provided in the frequency converter, the frequency converter controls the stirring motor to operate according to different rotation speeds corresponding to gated frequency values, and the frequency converter has an enable control signal terminal corresponding to the frequency values, and controls the stirring motor to operate at a corresponding rotation speed when the enable control signal terminal is gated. The stirring rotating speed of the motor is controlled to be selected within a range of a plurality of rotating speed set values or not more than three rotating speed set values, so that the requirement that the material stirring control of a conventional crystallizing tank in the medical industry does not need too high precision is met at the lowest cost.

Preferably, the frequency converter has a power input end for receiving three-phase alternating current, a driving output end connected to the stirring motor, and a main loop formed by the stirring motor (M), the frequency converter (UF) and the three-phase alternating current, in the main loop, the alternating current power supply controls the operation of the stirring motor M (variable frequency motor) through the frequency converter (UF), and the frequency converter further has an interlock start/stop port, and the frequency converter controls the start/stop of the stirring motor according to a communication state of the interlock start/stop port.

Preferably, the frequency converter has a digital tachometer output for connection to a digital tachometer, a run-control indicator switch (K1) for controlling the run indicator light (PGG) and a fault indicator switch (K2) for controlling the fault indicator light (PGY).

Preferably, the control circuit further comprises an auxiliary control module, and the auxiliary control module mainly comprises an interlocking start-stop switch circuit and a rotating speed selection module. The interlocking start-stop switch circuit and the rotating speed selection module can be controlled in a three-gear constant value manual/automatic adjustment mode.

Preferably, the interlock start-stop switch circuit and the rotation speed selection module are composed of a relay, a normally open contact of the relay forms a switch loop with the interlock start-stop port or the enable control signal end, one end of a relay coil is connected with a zero line, and the other end of the relay coil is connected with the interlock start-stop switch circuit or the rotation speed selection module.

Preferably, the number of the frequencies is 3, the frequencies correspond to three high, medium and low rotation speeds respectively, the auxiliary control module further comprises a time controller (KT), the time controller is provided with four output contacts for outputting control signals, the control signals are respectively a start-stop control output signal and three speed-regulating control output signals, the start-stop and speed-regulating control output time of the time controller can be programmed and set according to the production process flow, and the start-stop control output signals are provided.

Preferably, the control signals respectively control the power supply of the relay coils.

Preferably, the time controller has a reset pin connected to a normally open reset Switch (SBFT), and the auxiliary control module further comprises a manual/automatic selection switch (SA 1).

Preferably, the manual circuit of the interlocking start-stop switch circuit comprises a normally closed button serving as a manual stop switch SBF and a normally open button switch serving as a start button SBS which are connected in series, the other end of the start button SBS is connected with a coil of a start-stop relay KA, and the normally open end of the start-stop relay KA is connected with the start button SBS and a start-stop control end point (KT1) in parallel, so that the start-stop relay KA and the start button SBS form a self-locking start circuit.

Preferably, one phase line of the ac power supply is connected to a power supply terminal L of the time controller through a fuse FU4, and an N-terminal of the time controller is connected to a zero line of the power supply to form a power supply loop.

Because the conventional material stirring control of the crystallization tank in the medical industry does not need too high precision, generally speaking, the control range of the stirring rotating speed of the motor does not exceed three rotating speed set values, the invention also provides a speed regulation control method of the stirring motor of the medical crystallization tank, a frequency converter (UF) is used for controlling the stirring motor to operate, three frequency set values are set in an internal module of the frequency converter (UF) and a program stored in the internal module, different frequencies respectively correspond to a high rotating speed, a middle rotating speed and a low rotating speed, and the rotating speed of the stirring motor is controlled by utilizing the output of an enabling control signal end of the frequency converter corresponding to the three frequencies.

Preferably, manual control can be adopted, a motor manual start-stop button (SBS, SBF) and a high-middle-low three-gear rotating speed change-over switch SA are arranged in a crystallization tank local control box and used for controlling the start and stop of the motor, and meanwhile, according to the crystallization process flow and the material state, the relays (KA1, KA2 and KA3) are used for selecting action to represent to give high-middle-low three-gear trigger signals to the frequency converter, so that the frequency converter UF can enter three different frequency states, and the stirring motor M is controlled to enter three-gear rotating speed.

Preferably, in order to improve the productivity, according to the crystallization time period in the production process flow, a time controller KT outputs contact control signals at control end points (KT0-KT3) in different time periods, the contact control signals are connected into a start-stop control and frequency converter speed regulation control loop and respectively correspond to start-stop and high, middle and low three-gear rotating speed control, and the start-stop and speed regulation control output time of the time controller is programmed and set according to the production process flow.

Further, the time controller restores the initial timing state of the time controller through a reset button SBFT.

Further, a fixed value manual/automatic adjustment mode of three gears can be adopted.

The invention has the advantages that by means of the technical scheme, on the premise of meeting the process production requirements, the local manual and automatic speed regulation control of the crystallizing tank is simplified, the field control operation is convenient, and the investment cost is reduced. The manual and automatic frequency conversion control modes are realized, the operation is convenient, the cost input is controlled, and the cost performance is high on the premise of meeting the process production requirements.

Drawings

FIG. 1 is a schematic diagram of a speed regulation control circuit of a stirring motor of a medical crystallization tank.

Detailed Description

The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.

The inventor designs a crystallizer motor speed regulation control circuit convenient to operate according to the actual operation requirements of a common crystallization tank in the pharmaceutical industry by combining engineering experience.

The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in FIG. 1, it is a schematic diagram of a speed control circuit of a stirring motor of a medical crystallization tank of the present invention.

The circuit mainly comprises the following parts: the system comprises a main loop, a linkage start-stop switch, an operation, fault and power indication, a fuse, a time controller (interlocking output), a controller power loop, a reset button, a manual start-stop control circuit, an automatic start-stop control circuit, a manual start-stop, automatic start-stop selection switch, a manual three-gear speed regulation control, an automatic three-gear speed regulation control and the like, and in addition, the system can also comprise an on-site tachometer and a three-gear speed input device.

The invention relates to a speed regulation control circuit of a stirring motor of a medical crystallization tank, which mainly comprises a main loop and an auxiliary control module, wherein the main loop is composed of a frequency converter (UF), an alternating current power supply and the stirring motor M.

In the main loop, the alternating current power supply controls the operation of the stirring motor M (variable frequency motor) through the frequency converter (UF), and a program or logic circuit can be arranged in the frequency converter (UF), can store three preset frequency fixed values, can enable different frequencies to respectively correspond to high, medium and low rotating speeds so as to control the operation of the stirring motor M, and is correspondingly controlled by three corresponding enable control signal ends (D11, D12, D13) of the frequency converter. The preset frequency fixed value can be input by a three-gear rotating speed input device. It will be appreciated by those skilled in the art that the functions of storing the preset values and controlling the operation of the stirring motor M according to the frequency of the preset values can be implemented by any conventional technique including software control and hardware logic control.

The frequency converter UF is provided with interlocking start-stop ports (33, 34) and three enable control signal ends (D11, D12 and D13) corresponding to the preset rotating speed, and the interlocking start-stop ports (33, 34) are connected with an interlocking start-stop switch KA. The frequency converter UF can also be connected with a digital tachometer A0, an operation switch K1 and a fault switch K2. One phase line in the alternating current power supply supplies power to the auxiliary circuit through the fuse FU 4.