Actuating mechanism control method for glass plate tempering process

Abstract

An actuating mechanism control method for a glass plate tempering process, comprising: after a glass plate is conveyed into a heating furnace, a monitoring unit monitors in real time energy consumed by a heating element of the heating furnace, and sends the energy consumed to a control unit to compare with a set threshold; and when the energy consumed by the heating element of the heating furnace is greater than or equal to the set threshold, the control unit sends an instruction to an actuating mechanism to control actions of the actuating mechanism to complete a corresponding tempering process procedure. Through the method that the monitoring unit monitors in real time the energy consumed by the heating element of the heating furnace, a heating procedure of the glass plate is more scientifically and precisely controlled, and, therefore, a discharging moment of the glass plate can be accurately determined.

Claims

1. An actuating mechanism control method for a glass plate tempering process, comprising: conveying a glass plate into a heating furnace; monitoring in real time energy consumed by a heating element of the heating furnace by a monitoring unit; sending the energy consumed to a control unit to compare with a set threshold, wherein the set threshold is at least one of a set threshold Q1 and a set threshold Q2; and upon determining the energy consumed by the heating element of the heating furnace being greater than or equal to the set threshold, sending an instruction to an actuating mechanism by the control unit to control actions of the actuating mechanism, the actuating mechanism being a driving mechanism for controlling a glass plate discharge action or a control mechanism for controlling a cooling fan to run; wherein: when the actuating mechanism is the driving mechanism for controlling a glass plate discharge action, after the glass plate being conveyed into the heating furnace, the monitoring unit monitors in real-time the energy consumed by the heating element of the heating furnace, and sends the energy consumed to the control unit to compare with the set threshold Q1, upon determining the energy consumed by the heating element of the heating furnace being greater than or equal to the set threshold Q1, the control unit sends the instruction to the driving mechanism to directly discharge the glass plate from the heating furnace or to discharge the glass plate from the heating furnace after a delay, wherein the set threshold Q1=K1.Math.q0, q0=cmΔt, c is a specific heat capacity of the glass plate, m is a total mass of the glass plate to be heated, Δt is a temperature difference between a charging temperature of the glass plate and a discharging temperature of the glass plate, and K1 is a correction coefficient, a value range of which is 1<K1≤1.3; and wherein: when the actuating mechanism is the control mechanism for controlling the cooling fan to run, after the glass plate being conveyed into the heating furnace, the monitoring unit monitors in real-time the energy consumed by the heating element of the heating furnace, and sends the energy consumed to the control unit to compare with the set threshold Q2; and upon determining the energy consumed by the heating element of the heating furnace being greater than or equal to the set threshold Q2, the control unit sends the instruction to the control mechanism of the cooling fan, and the control mechanism of the cooling fan controls the cooling fan to be switched on or to be changed from an idle state to an active state, wherein the set threshold Q2=Q1.Math.K2, Q1=K1.Math.q0, q0=cmΔt, c is the specific heat capacity of the glass plate, m is the total mass of the glass plate to be heated, Δt is the temperature difference between the charging temperature of the glass plate and the discharging temperature of the glass plate, K1 is the correction coefficient, the value range of which is 1<K1≤1.3, and K2 is a correction coefficient for the cooling fan to run in advance, a value range of which is 0.5≤K2≤1.

2. The actuating mechanism control method for a glass plate tempering process according to claim 1, wherein the energy is electric energy consumed by the heating element of the heating furnace, and the monitoring unit is an electric energy meter, an electric energy module, or an electric energy sensor.

3. The actuating mechanism control method for a glass plate tempering process according to claim 1, wherein the energy is electric energy consumed by the heating element of the heating furnace, and the monitoring unit is a power meter, a power module, or a power sensor; and wherein instantaneous power of the heating element is monitored in real time by using the monitoring unit, and the instantaneous power is integrated over time to obtain the electric energy consumed by the heating element.

4. The actuating mechanism control method for a glass plate tempering process according to claim 1, wherein the energy is electric energy consumed by the heating element of the heating furnace, and the monitoring unit is a combination of a voltmeter and an ammeter, a combination of a voltage module and a current module, or a combination of a voltage sensor and a current sensor; and wherein an instantaneous voltage and an instantaneous current of the heating element are monitored in real time by using the monitoring unit, and a product of the instantaneous voltage and the instantaneous current is integrated over time to obtain the electric energy consumed by the heating element.

5. The actuating mechanism control method for a glass plate tempering process according to claim 1, wherein the energy is electric energy consumed by the heating furnace, and the monitoring unit is a programmable logic controller (“PLC”), a quantity of instantaneously opened heating elements is monitored in real time by using the PLC, and wherein instantaneous power of the heating elements of the entire heating furnace is obtained according to rated power of a single heating element, and the instantaneous power is integrated over time to obtain the electric energy consumed by the heating elements.

6. The actuating mechanism control method for a glass plate tempering process according to claim 1, wherein the energy is gas chemical energy consumed by the heating element of the heating furnace, and the monitoring unit is a gas meter.

7. The actuating mechanism control method for a glass plate tempering process according to claim 1, wherein the set threshold is manually input to the control unit through a human-machine interface or is obtained through automatic calculation by the control unit.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a variation curve chart of energy consumed by a heating element when a glass plate discharge action is controlled according to Embodiment 1 of the present disclosure.

(2) FIG. 2 is a variation curve chart of energy consumed by a heating element when a cooling fan is controlled to run according to Embodiment 2 of the present disclosure.

DETAILED DESCRIPTION

(3) The following describes embodiments of the present disclosure in detail with reference to the drawings, and detailed implementations are as follows:

Embodiment 1

(4) As shown in FIG. 1, the actuating mechanism is a driving mechanism for controlling a glass plate discharge action, and a control procedure of a heating control method of the present disclosure is as follows:

(5) Firstly, the total mass of the glass plate to be heated is obtained, and energy q.sub.0 needed for the glass plate to be heated from a charging temperature to a discharging temperature is calculated according to a formula q.sub.0=cmΔt, where c is a specific heat capacity of the glass plate, m is the total mass of the glass plate to be heated, and Δt is a temperature difference between the charging temperature of the glass plate and the discharging temperature of the glass plate. The discharging temperature is a temperature that is set in a glass plate tempering process when the glass plate is heated to be soft in a heating furnace, meeting a discharging condition. Usually, a value range of the discharging temperature is 650° C. to 700° C., and the discharging temperature may be set according to types (for example, low emissivity coating glass and clear class), and the thickness of the glass plate to be heated. The total mass of the glass plate may be directly measured by using an available weighing instrument, and may also be obtained through calculation according to the breadth size, the thickness, and the density of the glass plate to be heated.

(6) Secondly, a threshold Q.sub.1 meeting the discharging condition of the glass plate is calculated according to a formula Q.sub.1=K.sub.1.Math.q.sub.0, where K.sub.1 is a correction coefficient, a value range of which is 1<K.sub.1≤1.3. It should be noted that a value of K.sub.1 is related to impact factors such as heat-preservation performance of the heating furnace, an ambient temperature, and utilization of electric energy or gas. In an actual production procedure, a K.sub.1 value database related to the foregoing impact factors may be established for the heating furnace of a certain specification, so that K.sub.1 can be automatically retrieved from the database. In this embodiment, K.sub.1=1.2, and after the threshold Q.sub.1 is calculated, an operator inputs the threshold Q.sub.1 to a control unit through a human-machine interface. Certainly, the control unit may automatically obtain the total mass of the glass plate, and retrieve K.sub.1 from the database, to automatically calculate the threshold Q.sub.1.

(7) After being conveyed into the heating furnace at a low temperature, the glass plate begins absorbing heat, and energy consumed by a heating element increases rapidly. At this time, a monitoring unit monitors in real time the energy consumed by the heating element of the heating furnace, and compares the energy consumed with the set threshold Q.sub.1. When the energy consumed by the heating element of the heating furnace is greater than or equal to the threshold Q.sub.1, the control unit sends an instruction to the driving mechanism to directly discharge the glass plate from the heating furnace or to discharge the glass plate from the heating furnace after a delay.

(8) In this embodiment, when an electric heating furnace is used, the energy is electric energy consumed by the heating element of the heating furnace, and the monitoring unit is an electric energy meter, an electric energy module, or an electric energy sensor that may directly read the electric energy consumed by the heating element. Certainly, the monitoring unit in this embodiment may be a power meter, a power module, or a power sensor; instantaneous power of the heating element is monitored in real time by using the monitoring unit, and the instantaneous power is integrated over time to obtain the electric energy consumed by the heating element. In addition, the monitoring unit in this embodiment may alternatively be a combination of a voltmeter and an ammeter, a combination of a voltage module and a current module, or a combination of a voltage sensor and a current sensor; an instantaneous voltage and an instantaneous current of the heating element are monitored in real time by using the monitoring unit, and a product of the instantaneous voltage and the instantaneous current is integrated over time to obtain the electric energy consumed by the heating element.

(9) In this embodiment, when a gas heating furnace is used, the energy is gas chemical energy consumed by the heating element of the heating furnace, and therefore, the monitoring unit is a gas meter; and a product of a heat value of the gas and a volume of the gas consumed is the energy consumed by the heating element.

Embodiment 2

(10) As shown in FIG. 2, the actuating mechanism is a control mechanism of a cooling fan, and a control procedure of a control method of the present disclosure is as follows: Firstly, the total mass of the glass plate to be heated is obtained, and energy q.sub.0 needed for the glass plate to be heated from a charging temperature to a discharging temperature is calculated according to a formula q.sub.0=cmΔt, where c is a specific heat capacity of the glass plate, m is the total mass of the glass plate to be heated, and Δt is a temperature difference between the charging temperature of the glass plate and the discharging temperature of the glass plate. The discharging temperature is a temperature that is set in a glass plate tempering process when the glass plate is heated to be soft in a heating furnace, meeting a discharging condition. Usually, a value range of the discharging temperature is 600° C. to 700° C., and the discharging temperature may be set according to types (for example, low emissivity coating glass and clear class), and the thickness of the glass plate to be heated. The total mass of the glass plate may be directly measured by using an available weighing instrument, and may also be obtained through calculation according to the breadth size, the thickness, and the density of the glass plate to be heated.

(11) Secondly, a threshold Q.sub.2 meeting a running condition of the cooling fan is calculated according to formulas Q.sub.2=Q.sub.1.Math.K.sub.2, and Q.sub.1=K.sub.1.Math.q.sub.0, where K.sub.1 is a correction coefficient, a value range of which is 1<K.sub.1≤1.3. It should be noted about its value range that a value of K.sub.1 is related to impact factors such as heat-preservation performance of the heating furnace, an ambient temperature, and utilization of electric energy or gas. In an actual production procedure, a K.sub.1 value database related to the foregoing impact factors may be established for the heating furnace of a certain specification, so that K.sub.1 can be automatically retrieved from the database. K.sub.2 is a correction coefficient for the cooling fan to run in advance, a value range of which is 0.5≤K.sub.2≤1. In this embodiment, K.sub.1=1.2, K.sub.2=0.8, and after the threshold Q.sub.2 is calculated, an operator inputs the threshold Q.sub.2 to a control unit through a human-machine interface. Certainly, the control unit may automatically obtain the total mass of the glass plate, and retrieve K.sub.1 from the database, to automatically calculate the threshold Q.sub.2.

(12) After being conveyed into the heating furnace at a low temperature, the glass plate begins to absorb heat, and energy consumed by a heating element increases rapidly. At this time, a monitoring unit monitors in real time the energy consumed by the heating element of the heating furnace, and compares the energy consumed with the set threshold Q.sub.2. When the energy consumed by the heating element of the heating furnace is greater than or equal to the threshold Q.sub.2, the control unit sends an instruction to the control mechanism of the cooling fan, the control mechanism of the cooling fan controlling the cooling fan to be switched on or to be changed from an idle state to an active state.

(13) The heating element of the heating furnace in this embodiment may be an electric heating element or a gas heating element. The monitoring unit and a calculation procedure of the energy consumed by the heating element are the same as those in Embodiment 1. Details are not described herein again.

(14) The technical solutions and implementations provided in the present disclosure are not intended for limiting, and solutions that are equivalent to or have same effects of the technical solutions and implementations provided in the present disclosure fall within the protection scope of the present disclosure.