阅读说明：本技术 石膏胶凝材料凝结硬化检测系统及方法 (Gypsum cementing material setting and hardening detection system and method ) 是由 刘翔 黄滔 邱峰 傅强 任雨 胡秀华 李静芯 张蒙 于 2021-07-22 设计创作，主要内容包括：本发明提供了一种石膏胶凝材料凝结硬化检测系统及方法,系统包括：白度检测器和温度传感器,用于测量并输出石膏胶凝材料凝结硬化时的表面白度值数据和温度数据；数据处理器,与白度检测器和温度传感器相连,接收测量数据,并判断石膏胶凝材料是否到达凝结硬化时间；控制装置,与数据处理器相连,输出控制信号。方法包括步骤：S1,采集凝结硬化时的温度数据和白度值数据；S2,对数据进行处理分析,判断温度是否发生温升,并判断白度是否出现白度值变化率跃升,若出现温升且白度值变化率发生跃升,则执行S3,否则,执行S1；S3,控制模具驱动装置运行。该系统和方法可自动、准确检测及判定石膏的凝结硬化时间,实现石膏砌体制品全自动化生产。(The invention provides a system and a method for detecting the setting and hardening of a gypsum cementing material, wherein the system comprises: the whiteness detector and the temperature sensor are used for measuring and outputting surface whiteness value data and temperature data when the gypsum cementing material is set and hardened; the data processor is connected with the whiteness detector and the temperature sensor, receives the measurement data and judges whether the gypsum cementing material reaches the setting and hardening time or not; and the control device is connected with the data processor and outputs a control signal. The method comprises the following steps: s1, collecting temperature data and whiteness value data during coagulation hardening; s2, processing and analyzing the data, judging whether the temperature rises or not, and judging whether the whiteness value changes in a rate jump manner or not, if so, executing S3, otherwise, executing S1; and S3, controlling the operation of the die driving device. The system and the method can automatically and accurately detect and judge the setting and hardening time of the gypsum, and realize the full-automatic production of the gypsum masonry product.)

1. A gypsum cement setting and hardening detection system, comprising:

the whiteness detector is used for measuring the surface whiteness of the gypsum cementing material during setting and hardening and outputting whiteness value data;

the data processor is connected with the whiteness detectors and used for receiving the whiteness value data output by each whiteness detector and judging whether the gypsum cementing material reaches the setting and hardening time or not according to the whiteness value data;

and the control device is connected with the data processor, and outputs a control signal when the data processor judges that the gypsum cementing material reaches the setting and hardening time.

2. The gypsum cement set hardening detection system of claim 1, further comprising a temperature sensor coupled to said data processor for measuring the surface temperature of the gypsum cement as it sets and hardens and transmitting temperature data to said data processor.

3. The gypsum cementing material setting and hardening detection system according to claim 1 or 2, wherein the control device is connected with a mold driving device, and the mold driving device comprises a mold core pulling mechanism and a mold opening mechanism.

4. The method for detecting the setting and hardening of the gypsum cementing material is characterized by comprising the following steps of:

step S1, collecting surface temperature data and whiteness value data when the gypsum cementing material is set and hardened;

step S2, processing and analyzing the temperature data and the whiteness value data, judging whether the temperature rises or not, judging whether the whiteness value has a change rate jump or not, if the temperature rises and the change rate jump of the whiteness value occurs, executing step S3, otherwise, executing step S1;

in step S3, the operation of the mold driving device is controlled.

5. The method for detecting the setting and hardening of gypsum cement as claimed in claim 4, wherein in step S1, the collecting the temperature data and the whiteness value data of the surface of the gypsum cement when setting and hardening includes:

s101, continuously measuring the surface temperature of the gypsum cementing material during setting and hardening by adopting a temperature sensor to obtain a continuous temperature data time sequence;

and S102, continuously measuring the surface whiteness of the gypsum cementing material during setting and hardening by using a whiteness detector, and acquiring a continuous whiteness value data time sequence.

6. The method for detecting the setting and hardening of gypsum cement as claimed in claim 5, wherein in step S2, the temperature data and the whiteness value data are processed and analyzed to determine whether the temperature has risen and whether the whiteness has a rate-of-change jump, and if the temperature has risen and the rate-of-change of the whiteness value has jumped, step S3 is executed, otherwise, the step S1 is executed, which specifically includes:

step S201, analyzing the temperature data time sequence, comparing the time sequence with an initial temperature, and judging whether the temperature data has temperature rise;

step S202, carrying out differential processing on the time sequence of the whiteness value data to obtain the whiteness value change rate based on time, analyzing whether the whiteness value change rate exceeds a threshold value or not, and if the whiteness value change rate exceeds the threshold value, determining that jump occurs;

step S203, determining that the temperature data has a temperature rise and the change rate of the whiteness value has a jump, if so, performing step S3, otherwise, performing step S1.

7. The method for detecting the setting and hardening of gypsum cement according to claim 6, wherein in step S203, the change rate of the whiteness value is increased over a threshold value, and falls back to be lower than the threshold value after reaching a peak value, and the time point at which the change rate of the whiteness value falls back to be lower than the threshold value is taken as a determination time point.

8. The method for detecting the setting and hardening of gypsum cement according to claim 6, wherein in step S203, when the temperature data shows temperature rise and the change rate of whiteness value shows jump, it indicates that the gypsum cement has reached initial setting.

9. The method for detecting the setting and hardening of gypsum cement according to claim 4, wherein in step S3, the method for controlling the operation of the mold driving device specifically comprises:

step S301, controlling the mold driving device to perform mold core pulling operation;

and S302, after a preset time delta t is separated from the mold core pulling operation, controlling the mold driving device to perform mold opening operation of the mold.

10. The method for detecting the setting and hardening of gypsum cement according to claim 9, wherein said preset time Δ t is the time interval between the initial setting time and the final setting time of said gypsum cement.

Technical Field

The invention relates to the technical field of gypsum setting and hardening detection, in particular to a system and a method for detecting the setting and hardening of a gypsum cementing material.

Background

The gypsum masonry product is a comprehensive utilization mode of industrial byproduct gypsum, and the existing gypsum masonry product is mainly produced in a pouring mode without too many forming molds. In the casting mode production process, whether core pulling of the mold and opening operation of the mold plate are performed or not needs to be judged according to the setting and hardening conditions of the gypsum.

The industrial by-product gypsum has various physical properties and greatly different setting and hardening time due to different sources, types, calcining processes, aging processes and the like. For this reason, at present, no reliable detection system for automatically detecting whether the gypsum cementing material is coagulated, hardened and formed exists at home and abroad, and the auxiliary judgment is mainly carried out manually or the judgment is carried out by automatically detecting the temperature change in the production process.

The manual auxiliary judgment method mainly comprises a vicat penetration method and an empirical method. The Vicat penetration method adopts a standard Vicat instrument as a tool, and detects the hardness of the cementing material by continuously detecting the distance of the Vicat instrument probe inserted into the cementing material when falling, so as to judge whether the cementing material is coagulated. The method has accurate result, but has more complicated operation and large labor intensity, and is not suitable for large-scale production detection. The empirical method is to detect the hardness of the cementing material by pressing the surface of the cementing material with fingers and probes according to the experience of a detector, and judge whether the cementing material is coagulated. The method has the advantages that the detection result is greatly influenced by human factors, and the production efficiency is low.

The method for automatically detecting and judging the temperature change judges the gypsum setting condition according to the temperature rise condition in the gypsum setting process. Although the method can judge the gypsum setting condition, the result is generally in the later stage of gypsum setting and hardening, and the initial setting time cannot be accurately judged, namely the initial setting time cannot be accurately determined. And because the production of domestic gypsum masonry products mainly takes industrial by-product gypsum as a raw material, the source, the ingredients, the process and the like are various, the thermodynamic change trends of the setting process are consistent, but the specific temperature values are very different, the correlation between the setting temperature rise and the setting hardening time is very complex, the setting time is judged only by the change of the temperature trend in the setting process, and the reliability is poor.

Therefore, in the production process of the existing gypsum masonry product, whether the cementing material is condensed or not can not be efficiently detected and judged, and the time for pulling the core of the mold and opening the mold plate can not be automatically judged, so that the automatic production of the gypsum masonry product is difficult to realize, and the production efficiency is low, the energy consumption is high, and the cost is high.

Therefore, a detection system and a detection method which are suitable for large-scale production and can automatically and accurately detect and judge the setting and hardening time of the gypsum cementing material are urgently needed to be developed.

Disclosure of Invention

The invention provides a gypsum cementing material setting and hardening detection system and method, which can automatically and accurately detect and judge the setting and hardening time of gypsum and realize automatic control of the production of gypsum masonry products.

The technical scheme adopted by the invention is as follows:

a gypsum cement set hardening detection system, comprising:

the whiteness detector is used for measuring the surface whiteness of the gypsum cementing material during setting and hardening and outputting whiteness value data;

the data processor is connected with the whiteness detectors and used for receiving the whiteness value data output by each whiteness detector and judging whether the gypsum cementing material reaches the setting and hardening time or not according to the whiteness value data;

and the control device is connected with the data processor, and outputs a control signal when the data processor judges that the gypsum cementing material reaches the setting and hardening time.

In one embodiment of the present application, the system further comprises a temperature sensor connected to the data processor for measuring the surface temperature of the gypsum cement as it sets and hardens and transmitting temperature data to the data processor.

In one embodiment of the present application, the control device is connected to a mold driving device, and the mold driving device includes a mold core-pulling mechanism and a mold opening mechanism.

The method for detecting the setting and hardening of the gypsum cementing material comprises the following steps:

step S1, collecting surface temperature data and whiteness value data when the gypsum cementing material is set and hardened;

step S2, processing and analyzing the temperature data and the whiteness value data, judging whether the temperature rises or not, judging whether the whiteness value has a change rate jump or not, if the temperature rises and the change rate jump of the whiteness value occurs, executing step S3, otherwise, executing step S1;

in step S3, the operation of the mold driving device is controlled.

In an embodiment of the present application, in step S1, the acquiring the temperature data and the whiteness value data of the surface of the gypsum cement when setting and hardening includes:

s101, continuously measuring the surface temperature of the gypsum cementing material during setting and hardening by adopting a temperature sensor to obtain a continuous temperature data time sequence;

and S102, continuously measuring the surface whiteness of the gypsum cementing material during setting and hardening by using a whiteness detector, and acquiring a continuous whiteness value data time sequence.

In an embodiment of the present application, in the step S2, the temperature data and the whiteness value data are processed and analyzed, whether the temperature rises or not is determined, whether a rate of change of the whiteness value jumps or not is determined, if the temperature rises and the rate of change of the whiteness value jumps, the step S3 is executed, otherwise, the step S1 is executed, and specifically, the method includes:

step S201, analyzing the temperature data time sequence, comparing the time sequence with an initial temperature, and judging whether the temperature data has temperature rise;

step S202, carrying out differential processing on the time sequence of the whiteness value data to obtain the whiteness value change rate based on time, analyzing whether the whiteness value change rate exceeds a threshold value or not, and if the whiteness value change rate exceeds the threshold value, determining that jump occurs;

step S203, determining that the temperature data has a temperature rise and the change rate of the whiteness value has a jump, if so, performing step S3, otherwise, performing step S1.

In an embodiment of the application, in the step S203, the whiteness value change rate is increased by more than a threshold value, and falls back to be lower than the threshold value after reaching a peak value, and a time point that the whiteness value change rate falls back to be lower than the threshold value is taken as a determination time point.

In one embodiment of the present application, in step S203, when the temperature data shows a temperature rise and the change rate of the whiteness value shows a jump, it indicates that the gypsum cement has reached the initial set.

In an embodiment of the present application, in the step S3, the controlling the operation of the mold driving device specifically includes:

step S301, controlling the mold driving device to perform mold core pulling operation;

and S302, after a preset time delta t is separated from the mold core pulling operation, controlling the mold driving device to perform mold opening operation of the mold.

In one embodiment of the present application, the preset time Δ t is the time interval between the initial setting time and the final setting time of the gypsum cement.

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

1. the gypsum cementing material setting and hardening detection system is provided with the whiteness detector, the data processor and the control device, can automatically detect surface whiteness value data, judges whether the gypsum cementing material reaches setting and hardening time according to the surface whiteness value data, and outputs a control signal to control production equipment (such as a mold driving device) to operate according to a judgment result. The system can realize automatic detection and judgment of the setting and hardening conditions of the gypsum cementing material, controls the operation of production equipment according to the judgment result, has accurate detection and high automation degree, is suitable for large-scale production, and has high production efficiency.

2. The temperature sensor is arranged to collect surface temperature change data of the gypsum cementing material during setting and hardening as auxiliary judgment, so that false positive judgment caused by surface whiteness value data fluctuation at the initial detection stage can be effectively eliminated, the judgment accuracy of the detection system is improved, and the production efficiency and quality of the gypsum masonry product are improved.

3. According to the method for detecting the setting and hardening of the gypsum cementing material, the setting and hardening conditions of the gypsum cementing material are judged according to the temperature change condition and the whiteness value change condition of the surface of the gypsum cementing material, and then the operation of a mold driving device is controlled, namely the setting, hardening and forming time of the gypsum cementing material is judged, and the core pulling and mold opening operation of the mold is controlled. The change rate of the surface whiteness value is increased when the gypsum cementing material is set, hardened and formed (initial setting and/or final setting), and the change rate is used as a judgment basis; the temperature change of the gypsum cementing material at the initial stage of setting and hardening is small, the temperature rise phenomenon can occur after the setting is started, the surface temperature gradually rises, and the temperature starts to decrease after the highest temperature is reached; the detection of the surface whiteness value is easy to have error fluctuation (namely false positive jump) in the initial condensation stage, and the detection method can effectively eliminate error operation of the detection of the surface whiteness value by combining small temperature change in the initial condensation stage, so that the detection method is more accurate and reliable. The method can realize the automatic and large-scale production of the gypsum masonry product.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a block diagram of a system for detecting the setting and hardening of a gypsum cement according to an embodiment of the present invention.

FIG. 2 is a schematic flow chart of a method for detecting setting and hardening of a gypsum cementing material according to an embodiment of the present invention.

Detailed Description

In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Example 1

The present embodiment provides a gypsum cement setting and hardening detection system, which includes: whiteness degree detector, data processor, controlling means and mould drive arrangement etc..

The whiteness detector can be a whiteness detector, a reflectivity determinator and other devices with similar functions, and is used for detecting the surface whiteness of the gypsum cementing material during setting and hardening, acquiring and outputting whiteness value data, and transmitting the whiteness value data to the data processor. The whiteness value data is a whiteness value change data sequence based on time, namely whiteness time sequence data. The whiteness degree detector may comprise one or more.

And the data processor is electrically connected with the whiteness detectors and used for receiving the whiteness value data output by each whiteness detector and judging whether the gypsum cementing material reaches the setting and hardening time according to the change condition of the whiteness value data. The set hardening time may be the initial set time and/or the final set time of the gypsum cement.

And the control device is connected with the data processor and outputs a control signal according to the judgment result of the data processor so as to control the automatic operation of the gypsum masonry production equipment. Specifically, when the data processor judges that the gypsum cementing material is subjected to setting and hardening (initial setting/final setting) according to the change of the whiteness value data, the control device outputs a control signal to control the corresponding production equipment to automatically operate.

Specifically, the control device is electrically connected with the mold driving device, the mold driving device comprises a mold core pulling mechanism and a mold opening mechanism, and the control device can output control signals to respectively control the mold core pulling mechanism and the mold opening mechanism to operate so as to perform mold core pulling and mold opening. Generally, when the setting and hardening of the gypsum cementing material are judged to reach the initial setting time, the core of the mold is pulled; and opening the die when the setting and hardening of the gypsum cementing material reach the final setting time.

The theoretical basis of the setting of the gypsum cementing material setting and hardening detection system of the embodiment is as follows: when the gypsum cementing material is set and hardened (initial setting and/or final setting), the surface whiteness value of the gypsum cementing material undergoes a jump change, and whether the setting and hardening process of the gypsum cementing material reaches the initial setting time and/or the final setting time can be judged according to the jump change of the whiteness value.

The gypsum cementing material setting and hardening detection system detects the surface whiteness value of the gypsum cementing material during setting and hardening through the whiteness detector, analyzes and judges the setting and hardening condition of the gypsum cementing material according to the change condition of the surface whiteness value data, and controls the operation of the mold driving device according to the condition, so that the accurate detection of the setting and hardening time of the gypsum cementing material is realized, and the production of masonry products of the gypsum cementing material is automatically controlled.

Example 2

Referring to fig. 1, a block diagram of a system for detecting setting and hardening of a gypsum cementing material according to an embodiment of the present invention is shown. The gypsum cementing material setting and hardening detection system comprises: whiteness degree detector, temperature sensor, data processor, controlling means and mould drive arrangement etc..

The whiteness detector can be a whiteness detector, a reflectivity determinator and other equipment with similar functions, is electrically connected with the data processor, and is used for detecting the surface whiteness of the gypsum cementing material during setting and hardening, acquiring and outputting whiteness value data, and transmitting the whiteness value data to the data processor. The whiteness value data is a whiteness value change data sequence based on time, namely whiteness time sequence data. The whiteness degree detector may comprise one or more.

The temperature sensor is electrically connected with the data processor and used for measuring the surface temperature of the gypsum cementing material during setting and hardening, acquiring and outputting temperature data and transmitting the temperature data to the data processor. The temperature data is a time-based temperature change data sequence, namely temperature time sequence data. The temperature sensor includes one or more.

And the data processor is electrically connected with the whiteness detectors and the temperature sensors and is used for receiving the whiteness value data output by each whiteness detector and each temperature sensor and judging whether the gypsum cementing material reaches the setting and hardening time according to the change condition of the whiteness value data and the change condition of the temperature data. The set hardening time may be the initial set time and/or the final set time of the gypsum cement.

And the control device is connected with the data processor and outputs a control signal according to the judgment result of the data processor so as to control the automatic operation of the gypsum masonry production equipment. Specifically, when the data processor judges that the gypsum cementing material is subjected to setting and hardening (initial setting/final setting) according to the change of the whiteness value data and the change of the temperature data, the control device outputs a control signal to control the corresponding production equipment to automatically operate.

Specifically, the control device is electrically connected with the mold driving device, the mold driving device comprises a mold core pulling mechanism and a mold opening mechanism, and the control device can output control signals to respectively control the mold core pulling mechanism and the mold opening mechanism to operate so as to perform mold core pulling and mold opening. Generally, when the setting and hardening of the gypsum cementing material are judged to reach the initial setting time, the core of the mold is pulled; and opening the die when the setting and hardening of the gypsum cementing material reach the final setting time.

The theoretical basis of the setting of the gypsum cementing material setting and hardening detection system is as follows: (1) when the gypsum cementing material is set and hardened (initial setting and/or final setting), the surface whiteness value of the gypsum cementing material undergoes a jump change, and whether the setting and hardening process of the gypsum cementing material reaches the initial setting time and/or the final setting time can be judged according to the jump change of the whiteness value; (2) the surface of the gypsum cementing material can generate temperature rise change when setting and hardening, the surface temperature changes little or no from the beginning, gradually rises when the gypsum cementing material is set, and then starts to decrease after reaching the peak temperature, and the setting and hardening process of the gypsum cementing material can be judged according to the surface temperature rise change.

The gypsum cementing material setting and hardening detection system of the embodiment judges the setting and hardening conditions of the gypsum cementing material cooperatively by detecting the change of the whiteness value and the temperature change of the surface in the setting and hardening process of the gypsum cementing material. When the surface whiteness value data fluctuation is large at the early setting and hardening stage of the gypsum cementing material, the setting and hardening time is judged only by detecting the surface whiteness value data, and false positive is easy to occur; and the surface temperature change is small or unchanged at the early stage of setting and hardening of the gypsum cementing material, and the change can be cooperatively judged through the temperature change condition and the whiteness value data change, so that false positives can be effectively eliminated, and the accuracy of judging the setting and hardening time of the gypsum cementing material is ensured. The system can realize automatic detection and production control, has high accuracy, and can effectively ensure the production quality of gypsum masonry products.

Example 3

Referring to fig. 2, a schematic flow chart of a method for detecting setting and hardening of a gypsum cementing material according to an embodiment of the present invention is shown. The detection method of the present embodiment can be specifically applied to the detection system shown in fig. 2 and the detection system described in embodiment 2.

The method for detecting the setting and hardening of the gypsum cementing material comprises the following steps:

step S1, collecting surface temperature data and whiteness value data when the gypsum cementing material is set and hardened;

step S2, processing and analyzing the temperature data and the whiteness value data, judging whether the surface temperature of the gypsum cementing material rises, judging whether the whiteness of the surface of the gypsum cementing material rises in a jump way at the change rate of the whiteness value, if so, executing the step S3, otherwise, executing the step S1;

in step S3, the operation of the mold driving device is controlled.

The method for detecting the setting and hardening of the gypsum cementing material is based on a method for detecting the change condition of the surface whiteness value and the change condition of the surface temperature when the gypsum cementing material is set and hardened, a temperature sensor and a whiteness detector are adopted to continuously detect and analyze the surface temperature and the surface whiteness value of the gypsum cementing material, when the surface whiteness value is subjected to jump change and the temperature is increased, the time (namely initial setting time) for the gypsum cementing material to reach the setting and hardening can be judged, a mold driving device is controlled to operate according to the judged time, and the automatic control of a mold is realized. The method can efficiently detect and judge the setting time of the gypsum cementing material, has accurate detection and small error, is suitable for large-scale and automatic production of gypsum masonry products, and has high production efficiency.

Optionally, in step S1, the acquiring of the temperature data and the whiteness value data of the surface of the gypsum cement when setting and hardening includes:

s101, continuously measuring the surface temperature of the gypsum cementing material during setting and hardening by adopting a temperature sensor to obtain a continuous temperature data time sequence;

and S102, continuously measuring the surface whiteness of the gypsum cementing material during setting and hardening by using a whiteness detector, and acquiring a continuous whiteness value data time sequence.

And acquiring continuous temperature data and whiteness value data so as to know the change trend and the change process of the temperature and whiteness values in the setting and hardening process of the gypsum cementing material and provide a data basis for accurately judging the setting and hardening time (initial setting time/final setting time).

Optionally, in this step S2, the temperature data and the whiteness value data are processed and analyzed, whether the temperature rises or not is determined, whether a rate of change of the whiteness value jumps or not is determined, if the temperature rises and the rate of change of the whiteness value jumps, step S3 is executed, otherwise, step S1 is executed, which specifically includes:

step S201, analyzing the time sequence of the temperature data obtained in the step S101, comparing the temperature data with the initial temperature by taking the temperature of the initial stage (namely the initial temperature) as a reference, and judging whether the surface temperature of the gypsum cementing material rises or not;

step S202, carrying out difference processing on the time sequence of the whiteness value data acquired in the step S102 to acquire a whiteness value change rate based on time, analyzing whether the whiteness value change rate exceeds a threshold value or not, and if the whiteness value change rate exceeds the threshold value, determining that jump occurs;

step S203, judging that the temperature data on the surface of the gypsum cementing material rises and the change rate of the whiteness value of the surface of the gypsum cementing material rises, if so, executing step S3, otherwise, executing step S1.

Specifically, the threshold value can be determined by detecting the change condition of the surface whiteness value in the setting and hardening process of gypsum cementing materials of the same type, batch or source for multiple times, analyzing and processing to obtain the peak values of a plurality of whiteness value change rate jump peaks, and determining the threshold value of the gypsum cementing material by using 80% of the average value of the peak values. The operation of judging the occurrence of the jump of the change rate of the whiteness value according to the threshold value is accurate and reliable.

An increase in temperature (temperature rise) occurs on the surface of the gypsum cement, indicating that the gypsum has undergone a setting hardening reaction; the change rate of the whiteness value of the surface of the gypsum cementing material is increased, and the initial setting time or the final setting time of the surface gypsum cementing material is reached. The gypsum cementing material is judged to reach the initial setting time only when temperature rise and surface whiteness value change rate jump occur simultaneously, so that false positive jump caused by the condition that the change fluctuation of the whiteness value is large in the initial stage of setting and hardening can be effectively eliminated; because, at the initial stage of setting and hardening, the surface temperature changes little or no obvious change, and the auxiliary judgment is carried out through the temperature change, the reliability is higher, and the accuracy is higher.

In step S202, performing differential processing on the time series of the whiteness value data, where the differential processing specifically is to obtain a whiteness difference between a next data and a previous data of any two adjacent data in the time series of the whiteness value data, and the whiteness difference is a whiteness value change rate of the surface whiteness value of the gypsum cement in a corresponding time period.

The former data is subtracted from the latter data in the time sequence of the whiteness value data to obtain a group of whiteness difference values based on time, namely the change rate of the whiteness value. The change trend of the surface whiteness value data can be amplified through the difference comparison, the change condition of the surface whiteness value of the gypsum cementing material can be reflected more accurately, and the setting and hardening time can be judged more accurately.

Specifically, in step S203, the change rate of the whiteness value is increased over the threshold value, and after reaching the peak value, the change rate falls back to be lower than the threshold value, and the time point of the change rate of the whiteness value falling back to be lower than the threshold value is taken as a determination time point, and the gypsum cement is determined to be coagulated at this time, so that step S3 is performed.

The specific time point judgment method comprises the following steps: when the change rate of the whiteness value of the first point is greater than the threshold value and the change rate of the whiteness value of the second point is greater than the change rate of the whiteness value of the first point, continuing to measure the surface whiteness value data and calculating the change rate of the whiteness value;

and continuously measuring and calculating the change rate of the whiteness value for the first time when the change rate is smaller than the threshold value at the x-th point, judging that the jump peak value is between the first point and the x-th point, and judging that the time point of the x-th point is the coagulation time.

And judging the jump peak value of the change rate of the whiteness value through a threshold value, and judging the time of the xth point which is smaller than the threshold value for the first time after the reversion as the coagulation time, thereby ensuring the accuracy and the uniformity of the coagulation time judgment.

Alternatively, in step S203, when the temperature data of the surface of the gypsum cement material is increased and the change rate of the whiteness value of the surface of the gypsum cement material is increased, it indicates that the gypsum cement material reaches initial setting.

If only the change rate of the whiteness value is increased suddenly, the temperature change is not obvious, and the gypsum cementing material is not coagulated; if the temperature is merely increased, the rate of change of the whiteness value does not jump, indicating that the gypsum cement has undergone a setting reaction, but has not yet reached initial setting.

The trend of the temperature change of the surface when the gypsum cementing material is set and hardened is as follows: initially, there is little or no change in temperature; when condensation reaction occurs, the temperature is gradually increased; at or after the initial setting time, the temperature reaches a maximum value and begins to drop rapidly as the temperature rises to a peak. The setting and hardening conditions of the gypsum cementing material are judged only through temperature change, the result is generally in the later stage of the setting and hardening of the gypsum, and the initial setting time of the gypsum cementing material cannot be accurately judged.

The surface whiteness value change trend of the gypsum cementing material when setting and hardening is as follows: the surface whiteness value is obviously increased in the initial setting process, and the surface whiteness value is also increased in the final setting process of part of gypsum materials; other times the surface whiteness values do not change much. However, in the initial detection stage, the initial whiteness value data fluctuation is easy to occur due to the influences of detection instrument debugging, gypsum cementing material surface stability and the like; the setting and hardening conditions of the gypsum cementing material are judged only through the change of the whiteness value, and the misjudgment is easy to occur.

Therefore, the initial setting time of the gypsum cementing material can be efficiently and accurately judged by taking the change rate of the whiteness as the main judgment basis and combining the temperature change to assist the judgment, thereby eliminating the error influence caused by the fluctuation of the initial whiteness.

Optionally, in step S3, the controlling the operation of the mold driving device specifically includes:

step S301, sending a control signal to control the mold driving device to perform mold core pulling operation;

step S302, after a preset time delta t is separated from the mold core-pulling operation, a control signal is sent to control the mold driving device to open the mold.

The preset time delta t is the time interval between the initial setting time and the final setting time of the gypsum cementing material.

The time interval between the initial setting and the final setting of the gypsum cement of the same type is relatively fixed, i.e., Δ t is a fixed time interval for the gypsum cement of the same type. When the initial setting time of the gypsum cementing material is detected, the final setting time of the gypsum cementing material can be judged by setting the preset time length delta t.

In one embodiment, in step S203, it is determined that the temperature data of the surface of the gypsum cement material has a temperature rise, and the change rate of the whiteness value of the surface of the gypsum cement material has a jump, and the time point when the time value falls below the threshold value after the jump reaches the peak value is taken as the determination time point, so as to determine that the gypsum cement material reaches the initial setting time at the time point; the collection of temperature data and whiteness value data of the surface of the gypsum cementing material can be stopped, and the final setting time is judged by setting the preset time length delta t.

In another embodiment, in step S203, it is determined that the temperature data of the surface of the gypsum cement material has a temperature rise, and the change rate of the whiteness value of the surface of the gypsum cement material has a jump, and the time point when the value falls below the threshold value after the jump reaches the peak value is taken as the determination time point, so as to determine that the gypsum cement material reaches the initial setting time at the time point; and then continuously collecting whiteness value data of the surface of the gypsum cementing material, carrying out difference processing on the whiteness value data to obtain a whiteness value change rate based on time, and when the whiteness value change rate rises again, taking the time point when the rising reaches the peak value and then falls below a threshold value as a judgment time point, and judging that the gypsum cementing material reaches final setting time.

According to the gypsum cementing material setting and hardening detection method, the setting and hardening conditions of the gypsum cementing material are judged according to the temperature change conditions and the whiteness value change conditions of the surface of the gypsum cementing material, and then the operation of a mold driving device is controlled, namely the setting, hardening and forming time of the gypsum cementing material is judged, and the core pulling and mold opening operation of the mold is controlled. The change rate of the surface whiteness value is increased when the gypsum cementing material is set, hardened and formed (initial setting and/or final setting), and the change rate is used as a judgment basis; the temperature change of the gypsum cementing material at the initial stage of setting and hardening is small, the temperature rise phenomenon can occur after the setting is started, the surface temperature gradually rises, and the temperature starts to decrease after the highest temperature is reached; the detection of the surface whiteness value is easy to have error fluctuation (namely false positive jump) in the initial condensation stage, and the detection method can effectively eliminate error operation of the detection of the surface whiteness value by combining small temperature change in the initial condensation stage, so that the detection method is more accurate and reliable. The method can realize the automatic and large-scale production of the gypsum masonry product.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.