阅读说明：本技术 一种玻璃制品供料通道温度控制方法 (Glass product feeding channel temperature control method ) 是由 赵荣旺 于 2021-01-12 设计创作，主要内容包括：一种玻璃制品供料通道温度控制方法,属于玻璃机械技术领域。步骤1)控制器根据热电偶检测到的加热区(2)的温度信号,计算比例马达(7)需要转过的角度的理论值,并根据理论值向比例马达(7)发送脉冲信号；步骤2)比例马达(7)向控制器反馈实际转过的角度的反馈值；步骤3)控制器根据反馈值和理论值的偏差,来控制比例马达(7)的转速,以调节阀门的阀片开合的速度。本玻璃制品供料通道温度控制方法通过比例马达控制阀门阀片的开启速度,以控制燃气混合气的输送速度,并通过火焰来控制供料通道的温度,检测更加准确,且不存在滞后性,使检测更加准确、敏感,从而能够精确控制供料通道内玻璃液的温度。(A temperature control method for a glass product feeding channel belongs to the technical field of glass machinery. Step 1) the controller calculates a theoretical value of an angle which needs to be rotated by the proportional motor (7) according to a temperature signal of the heating area (2) detected by the thermocouple, and sends a pulse signal to the proportional motor (7) according to the theoretical value; step 2), the proportional motor (7) feeds back a feedback value of an actually rotated angle to the controller; and 3) controlling the rotating speed of the proportional motor (7) by the controller according to the deviation of the feedback value and the theoretical value so as to adjust the opening and closing speed of a valve plate of the valve. According to the glass product feeding channel temperature control method, the opening speed of the valve plate is controlled through the proportional motor to control the conveying speed of the fuel gas mixture, the temperature of the feeding channel is controlled through flame, the detection is more accurate, the hysteresis is avoided, the detection is more accurate and sensitive, and the temperature of glass liquid in the feeding channel can be accurately controlled.)

1. A glass product feeding channel temperature control method is characterized in that: the feeding channel is connected with a mixed gas pipeline (5), a valve is arranged on the mixed gas pipeline (5), a proportional motor (7) is connected with the valve and enables the valve to be opened or closed, and a thermocouple is arranged in the heating area (2);

the control method comprises the following steps:

step 1), a controller calculates a theoretical value of an angle which needs to be rotated by a proportional motor (7) according to a temperature signal of a heating area (2) detected by a thermocouple;

step 2), the proportional motor (7) feeds back a feedback value of an actually rotated angle to the controller;

and 3) controlling the rotating speed of the proportional motor (7) by the controller according to the deviation of the feedback value and the theoretical value so as to adjust the opening and closing speed of a valve plate of the valve.

2. The method of claim 1, wherein: and (2) after PID operation, the controller in the step 1) determines a theoretical value of the rotating angle of the proportional motor (7).

3. The method of claim 1, wherein: when the deviation in the step 3) is larger than the threshold value, the duty ratio of the pulse signal transmitted to the proportional motor (7) by the controller is 100 percent; when the deviation is less than or equal to the threshold value, the duty ratio of the pulse signal is synchronously reduced with the reduction of the deviation.

4. The method of claim 3, wherein: the threshold value comprises a first threshold value and a second threshold value, the first threshold value is larger than the second threshold value, when the deviation is larger than the first threshold value, the duty ratio of the pulse signal is 100%, when the deviation is larger than the second threshold value and smaller than the first threshold value, the duty ratio of the pulse signal is synchronously reduced along with the reduction of the deviation, and when the deviation is smaller than the second threshold value, the proportional motor rotates at a specified rotating speed.

5. The method of claim 1, wherein: the valve is a butterfly valve.

6. The method of claim 1, wherein: a thermocouple is arranged in the feeding channel, and the controller sends out a pulse signal to the proportional motor (7) after PID operation according to a temperature signal detected by the thermocouple.

7. The method of claim 1, wherein: the feed passage include cooling zone (1), the district of heating (2) and material basin (10) that set gradually from top to bottom, cooling zone (1) and the district of heating (2) all are connected with mixed gas pipeline (5), cooling zone (1) still is connected with cooling blower (3).

8. The method of claim 7, wherein: the manifold of the cooling area (1) is connected with a pressure transmitter (9) for detecting the real-time pressure of the manifold, the controller controls the cooling air volume of the cooling fan (3) in real time according to the difference value between the cooling area (1) and the set pressure, and the real-time pressure ratio is larger than the set pressure, and the cooling air volume of the cooling fan (3) is smaller.

9. The method of claim 1, wherein: and a pressure transmitter (9) is also arranged on the mixed gas pipeline (5) connected with the heating area (2).

Technical Field

A temperature control method for a glass product feeding channel belongs to the technical field of glass machinery.

Background

The demand of the current international and domestic markets for high-grade glass products is continuously increased, so the requirement on the precision of the temperature control of a glass product feed channel is higher and higher. In the prior art, the heating form of most domestic material channels is gas heating, specifically: utilize the fan to blow in the feeder channel with the mist of air and gas, ignite the back with the gas and heat the glass raw materials in the feeder channel, blow in the feeder channel with the cooling air through the fan and cool off the feeder channel, detect the temperature in the feeder channel through temperature sensor to form closed-loop control through the controller, carry out real-time regulation with the temperature to in the feeder channel. However, the temperature sensor has hysteresis for detecting the temperature, and the detection precision of the temperature sensor is limited, so that when the temperature fluctuates in a small range, the temperature sensor cannot sense the change of the temperature, the temperature in the feeding channel is unstable, and the temperature is difficult to adjust in time after the temperature in the feeding channel changes, so that the requirement of high quality of the current glass is difficult to meet.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the method for controlling the temperature of the glass product feeding channel overcomes the defects of the prior art, is accurate in control, solves the problem of hysteresis in temperature detection, and can accurately control the temperature in the feeding channel.

The technical scheme adopted by the invention for solving the technical problems is as follows: the temperature control method of the glass product feeding channel is characterized in that: the feeding channel is connected with a mixed gas pipeline, a valve is arranged on the mixed gas pipeline, the proportional motor is connected with the valve and enables the valve to be opened or closed, and a thermocouple is arranged in the heating zone;

the control method comprises the following steps:

step 1) the controller calculates the theoretical value of the angle which needs to be rotated by the proportional motor according to the temperature signal of the heating area detected by the thermocouple;

step 2) the proportional motor feeds back a feedback value of an actually rotated angle to the controller;

and 3) controlling the rotating speed of the proportional motor by the controller according to the deviation of the feedback value and the theoretical value so as to adjust the opening and closing speed of the valve plate of the valve.

Preferably, the controller in step 1) determines a theoretical value of the angle rotated by the proportional motor after PID operation.

Preferably, when the deviation in the step 3) is greater than the threshold, the duty ratio of the pulse signal transmitted to the proportional motor by the controller is 100%; when the deviation is less than or equal to the threshold value, the duty ratio of the pulse signal is synchronously reduced with the reduction of the deviation.

Preferably, the threshold includes a first threshold and a second threshold, the first threshold is greater than the second threshold, the duty ratio of the pulse signal is 100% when the deviation is greater than the first threshold, the duty ratio of the pulse signal decreases synchronously with the decrease of the deviation when the deviation is greater than the second threshold and less than the first threshold, and the proportional motor rotates at a designated rotation speed when the deviation is less than the second threshold.

Preferably, the valve is a butterfly valve.

Preferably, a thermocouple is arranged in the feeding channel, and the controller sends a pulse signal to the proportional motor after PID operation according to a temperature signal detected by the thermocouple.

Preferably, the feed passage include the cooling zone, the zone of heating and the basin that from top to bottom set gradually, the cooling zone all is connected with the mixed gas pipeline with the zone of heating, the cooling zone still is connected with cooling blower.

Preferably, the cooling zone manifold is connected with a pressure transmitter for detecting the real-time pressure of the manifold, the controller controls the cooling air volume of the cooling fan in real time according to the difference value between the cooling zone and the set pressure, and the larger the real-time pressure is than the set pressure, the smaller the cooling air volume of the cooling fan is. The real-time pressure of the cooling area is monitored in real time, the air quantity of the cooling fan is adjusted according to the difference value of the real-time pressure and the set pressure, and the fluctuation range of the pressure is larger than the fluctuation range of the temperature, so that the pressure monitoring is more sensitive, and the detection is more accurate.

Preferably, a pressure transmitter is also arranged on the mixed gas pipeline connected with the heating zone.

Compared with the prior art, the invention has the beneficial effects that:

according to the glass product feeding channel temperature control method, the opening speed of the valve plate is controlled through the proportional motor, the controller controls the rotating speed of the proportional motor by changing the duty ratio of the pulse signal sent to the proportional motor, the opening speed of the valve is further controlled, the conveying speed of gas mixture is controlled, the temperature of the feeding channel is controlled through flame, the detection is more accurate, the hysteresis is avoided, the detection is more accurate and sensitive, and the temperature of glass liquid in the feeding channel can be accurately controlled.

Drawings

FIG. 1 is a schematic view of a glass product supply passage.

In the figure: 1. the device comprises a cooling area 101, a cooling air outlet 102, a cooling air inlet 2, a heating area 3, a cooling fan 4, a cooling air pipe 5, a mixed gas pipeline 6, a combustion-supporting air pipeline 7, a proportional motor 8, a mixer 9, a pressure transmitter 10 and a material basin.

Detailed Description

Fig. 1 shows a preferred embodiment of the present invention, which is further described below with reference to fig. 1.

A temperature control method for a glassware feeding channel is characterized in that the feeding channel is connected with a mixed gas pipeline 5, a valve is arranged on the mixed gas pipeline 5, and a proportional motor 7 is connected with the valve and enables the valve to be opened or closed; the control method comprises the following steps: the controller sends a pulse signal to the proportional motor 7 and calculates the theoretical position of the valve plate of the valve, the duty ratio of the pulse signal is adjusted by the controller according to the deviation between the actual position and the theoretical position of the valve plate fed back by the proportional motor 7, and the larger the deviation is, the larger the duty ratio of the pulse signal is. According to the glass product feeding channel temperature control method, the opening speed of the valve plate of the valve is controlled through the proportional motor 7, the controller controls the rotating speed of the proportional motor 7 through changing the duty ratio of the pulse signal sent to the proportional motor 7, the opening speed of the valve is further controlled, the conveying speed of gas mixed gas is controlled, the temperature of the feeding channel is controlled through flame, the detection is more accurate, the hysteresis is avoided, the detection is more accurate and sensitive, and the temperature of glass liquid in the feeding channel can be accurately controlled.

The present invention is further described with reference to the following detailed description, however, it should be understood by those skilled in the art that the detailed description given herein with respect to the accompanying drawings is for better explanation and that the present invention is not necessarily limited to the specific embodiments, but rather, for equivalent alternatives or common approaches, may be omitted from the detailed description, while still remaining within the scope of the present application.

Specifically, the method comprises the following steps: as shown in fig. 1: the cooling zone 1 and the heating zone 2 are sequentially arranged from top to bottom, and the material basin 10 is arranged at the lower side of the heating zone 2 and is connected with the heating zone 2. The top of the cooling zone 1 is provided with a cooling air outlet 101, and the lower part of the cooling zone 1 is provided with a cooling air inlet 102.

The lower part of the cooling area 1 is connected with a cooling fan 3, a cooling air pipe 4 is arranged between the cooling fan 3 and the cooling area 1, one end of the cooling air pipe 4 is communicated with an air outlet of the cooling fan 3, and the other end of the cooling air pipe is communicated with a cooling air inlet 102.

The middle parts of the cooling zone 1 and the heating zone 2 are both connected with a mixed gas pipeline 5, the input port of the mixed gas pipeline 5 is communicated with a combustion-supporting air pipeline 6, and the combustion-supporting air pipeline 6 provides combustion-supporting air for the mixed gas pipeline 5. Valve and blender 8 have set gradually on each mixed gas pipeline 5, are connected with pressure transmitter 9 on the blender 8, and blender 8 still is connected with the gas pipeline to make gas and combustion-supporting wind mix, in this embodiment, the valve is the butterfly valve. The pressure transmitter 9 of the cooling zone 1 is arranged on the mixed gas line 5 connected to the cooling zone 1.

Thermocouples are arranged in the cooling zone 1 and the heating zone 2. The controller is simultaneously connected with the two thermocouples and the two pressure transmitters 9, the signal input end of the controller is connected with the proportional motor 7, and the controller is also connected with an upper computer. In this embodiment, the controller is a PLC controller.

The control method comprises the following steps:

the thermocouple of cooling zone 1 monitors the temperature in cooling zone 1 in real time, and pressure transmitter 9 on the manifold of cooling zone 1 monitors the real-time pressure of cooling zone 1 in real time simultaneously to give the controller with temperature signal and real-time pressure signal transmission, the difference of the set pressure and real-time pressure that the controller set for according to the host computer, and combine temperature signal, after analysis PID calculates, control cooling blower 3's the cooling amount of wind and the rotational speed of proportional motor 7 and the aperture of butterfly valve. When the real-time pressure is larger than the set pressure, namely the real-time pressure is higher, the cooling air volume of the cooling fan 3 is larger, so that the temperature of the cooling area 1 can be adjusted. And a pressure transmitter 9 on the mixed gas pipeline 5 connected with the cooling area 1 also uploads the detected pressure data to the controller, and the detected pressure data is combined with the difference value between the set pressure and the real-time pressure and is subjected to PID analysis to control the cooling air volume of the fan 3.

The heating control of the cooling zone 1 and the heating control of the heating zone 2 are the same. In the present embodiment, the heating control method of the heating area 2 is explained.

The controller is connected with an upper computer, the proportional motor 7 is connected with the controller through a signal feedback line or a wireless module, the actual rotating angle of the proportional motor 7 is fed back, and the theoretical value and the feedback value of the rotating angle of the proportional motor 7 are displayed on the upper computer.

The heating control method of the heating area 2 includes the steps of:

step 1), a controller calculates a theoretical value of an angle which needs to be rotated by a proportional motor 7 according to a temperature signal of a heating area 2 detected by a thermocouple;

the thermocouple of the heating area 2 uploads the temperature signal to the controller, the controller calculates the theoretical value of the angle that the proportional motor 7 needs to rotate through PID operation, and the theoretical position that the valve plate of the butterfly valve needs to reach can be calculated through the theoretical value.

Step 2) the proportional motor 7 feeds back the feedback value of the actual turning angle to the controller.

The proportional motor 7 transmits a feedback value of the actual rotating angle of the proportional motor 7 to the controller through a signal feedback line or a wireless module, namely, the actual position of a valve plate of the butterfly valve is fed back to the controller. The rotation angle range of the valve plate of the butterfly valve is 0-90 degrees, the corresponding opening degree of the valve plate is 0-100%, the rotation angle range of the proportional motor 7 is 0-90 degrees, and the rotation angle of the proportional motor 7 is the same as that of the valve plate. The controller calculates the theoretical rotation angle of the proportional motor 7, namely the rotation angle of the valve plate of the detection butterfly valve, namely the opening degree of the valve plate. The initial feedback value is the angle of the initial position of the proportional motor 7 deflected by 0 ° relative to the valve plate.

And 3) controlling the rotating speed of the proportional motor 7 by the controller according to the deviation of the feedback value and the theoretical value so as to adjust the opening and closing speed of a valve plate of the valve.

The controller compares the feedback value with the theoretical value, controls the duty ratio of the pulse signal according to the deviation of the actual value and the theoretical value, further controls the rotating speed of the proportional motor 7, and adjusts the opening and closing speed of the valve plate of the butterfly valve, namely, controls the adjusting angle of the valve plate according to the difference value between the valve plate of the butterfly valve and the theoretical position. The larger the deviation, the larger the duty ratio of the pulse signal.

Thresholds are set in the controller, and the thresholds comprise a first threshold and a second threshold. When the controller outputs a pulse signal, when the deviation is greater than a first threshold value, the duty ratio of the pulse signal output by the controller is 100%, at the moment, the proportional motor 7 rotates at full speed, and the opening or closing speed of the butterfly valve is high; when the deviation is greater than the second threshold value and less than the first threshold value, the duty ratio of the pulse signal output by the controller is reduced, the rotating speed of the proportional motor is reduced, and the opening or closing speed of the butterfly valve is reduced, so that the temperature is ensured to be slowly adjusted to be set, and the temperature is prevented from exceeding the set temperature; when the deviation between the feedback value and the actual output value of the proportional motor 7 is smaller than a second threshold value, the duty ratio of the pulse signal output by the controller is minimum, and at the moment, the proportional motor rotates at the slowest speed and rotates at the specified speed. The proportional motor 7 drives the butterfly valve of the gas mixture to change the size of the gas mixture, and further change the size of flame, so that the temperature of the molten glass in the glass material channel is controlled stably.

In this embodiment, the first threshold is 30% and the second threshold is 15%, that is, when the deviation is greater than 30%, the duty ratio of the pulse signal output by the controller is 100%, and at this time, the proportional motor 7 rotates at full speed, and the opening or closing speed of the butterfly valve is fast; when the deviation is more than 15% and less than 30%, the duty ratio of the pulse signal output by the controller is reduced, the rotating speed of the proportional motor is reduced, and the opening or closing speed of the butterfly valve is reduced, so that the temperature is slowly adjusted to the set temperature, and the temperature is prevented from exceeding the set temperature; when the deviation of the feedback value of the proportional motor 7 and the actual output value is less than 15%, the duty ratio of the pulse signal output by the controller is minimum, and the proportional motor rotates at the slowest speed and rotates at the specified speed.

The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.