An automatic water adding device in wheat flour grinding process

Abstract

The present application provides an automatic water adding device in the wheat flour grinding process, including a stirring bin, a feed pipe and a discharge pipe connected to the stirring bin, a stirring device in the stirring bin, a humidity sensor, a flour flow rate sensor, a water flow rate sensor, a control device, a water supply device, a proportional valve, an air supply device, a gas-liquid mixing device connected to the air supply device and the water supply device, an electromagnetic valve, and a nozzle connected to the gas-liquid mixing device and facing the stirring bin; the humidity sensor and the flour flow rate sensor are on the feed pipe, and their sensing ends face the inside of the feed pipe, the water supply device and the air supply device are both connected to the gas-liquid mixing device, a proportional valve and a water flow rate sensor are arranged on the connecting pipeline between the water supply device and the gas-liquid mixing device, an electromagnetic valve is arranged on the connecting pipeline between the gas-liquid mixing device and the nozzle, the humidity sensor, the flour flow rate sensor, and the water flow rate sensor are all connected to the control device, and the control device is respectively connected to the proportional valve and the electromagnetic valve. The present invention can ensure uniform water addition and high production efficiency.

Description

Technical Field

[0001] The present application relates to the field of mechanical technology, and in particular to an automatic water adding device in a wheat flour grinding process. Background Art

[0002] Before wheat is ground into flour, a certain amount of water is added to the wheat before grinding. This technology and process are already very mature. However, during the wheat flour production process, due to the loss of water caused by the heating of the flour, a certain proportion of water needs to be added according to the process requirements. Currently, the industry uses a static method to measure the humidity (water content) of the flour, that is, the amount of water added is manually controlled. This measurement method has at least the following problems:

[0003] 1. It is not possible to dynamically and continuously control the amount of water added to flour to ensure the humidity of the flour;

[0004] 2. During the grinding process, the amount of water added needs to be dynamically adjusted for flours with different recipes.

[0005] According to national standards, the maximum moisture content of flour should be less than 15%. Therefore, it is very important to control the amount of water added to flour. Summary of the invention

[0006] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides an automatic water adding device in the wheat grinding process.

[0007] The present application provides an automatic water adding device in the wheat flour grinding process, comprising: a stirring bin, a feeding pipe, a discharging pipe, a stirring device, an imported flour moisture sensor, a flour flow rate sensor, a water flow rate sensor, a control device, a water supply device, a proportional valve, an air supply device for supplying compressed air, a gas-liquid mixing device, a solenoid valve and a nozzle;

[0008] The feed pipe and the discharge pipe are both communicated with the stirring bin, the stirring device is arranged in the stirring bin, the imported flour moisture sensor and the flour flow rate sensor are arranged on the feed pipe, the sensing end of the imported flour moisture sensor and the sensing end of the flour flow rate sensor are both facing the inside of the feed pipe, the water supply device and the air supply device are both connected to the gas-liquid mixing device, the proportional valve and the water flow rate sensor are arranged on the connecting pipeline between the water supply device and the gas-liquid mixing device, the air supply device is connected to the gas-liquid mixing device, the gas-liquid mixing device is connected to the nozzle, the solenoid valve is arranged on the connecting pipeline between the gas-liquid mixing device and the nozzle, the nozzle is arranged on the pipe wall of the stirring bin, facing the inside of the stirring bin, the output of the imported flour moisture sensor, the output of the flour flow rate sensor and the output of the water flow rate sensor are all connected to the input of the control device, and the output of the control device is respectively connected to the proportional valve and the solenoid valve.

[0009] Preferably, the water flow rate sensor is an SM6000 electromagnetic flow rate meter.

[0010] Preferably, it comprises at least four nozzles and at least two solenoid valves, and the at least four nozzles are evenly arranged in the horizontal direction of the stirring chamber;

[0011] The gas-liquid mixing device is connected to each of the nozzles via a first connecting pipeline, and one solenoid valve is arranged on each of the first connecting pipelines;

[0012] Alternatively, the gas-liquid mixing device and every two of the nozzles are connected via a second connecting pipeline, the two nozzles connected to the second connecting pipeline are symmetrically arranged in the horizontal direction of the mixing chamber, and one solenoid valve is arranged on each second connecting pipeline.

[0013] Preferably, a release solenoid valve is provided on the connecting pipeline between the gas supply device and the gas-liquid mixing device, and the output of the control device is connected to the release solenoid valve.

[0014] Preferably, it also includes an outlet flour moisture sensor;

[0015] The outlet flour moisture sensor is arranged on the discharge pipe, the sensing end of the outlet flour moisture sensor faces the inside of the discharge pipe, and the output of the outlet flour moisture sensor is connected to the input of the control device.

[0016] Preferably, a pressure gauge is provided on the connecting pipeline between the water supply device and the gas-liquid mixing device.

[0017] Preferably, the water supply device comprises a water storage tank and a water pump;

[0018] The water storage tank is connected to the water inlet of the water pump, and the water outlet of the water pump is connected to the gas-liquid mixing device.

[0019] Preferably, a pressure gauge is provided on the connecting pipeline between the gas supply device and the gas-liquid mixing device.

[0020] Preferably, the stirring device comprises a stirring motor and stirring blades, and the rotating shaft of the stirring motor is connected to the stirring blades.

[0021] Preferably, the water pump has a variable frequency speed regulation function.

[0022] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0023] The automatic water adding device in the wheat flour grinding process of the present invention is equipped with an imported flour moisture sensor on the feed pipe, so that the moisture of the flour can be continuously measured, and the moisture in the flour can be measured under the dynamic feeding condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of an automatic water adding device in a wheat flour grinding process provided in an embodiment of the present application;

[0025] Figure 2 for Figure 1 Schematic diagram of the structure of the nozzle and solenoid valve part of the automatic water adding device in the wheat grinding process.

[0026] In the figure: mixing bin 1 flour flow rate sensor 2 inlet flour moisture sensor 3 water storage tank 4 water pump 5 proportional valve 6 water flow rate sensor 7 gas-liquid mixing device 8 solenoid valve 9 nozzle 10 outlet flour moisture sensor 11 feed pipe 12 DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] Various embodiments and aspects of the present invention will be described with reference to the details discussed below, and the accompanying drawings will illustrate various embodiments. The following description and accompanying drawings are used to illustrate the present invention rather than to be interpreted as limiting the present invention. A large amount of specific details have been described to provide a full understanding of various embodiments of the present invention. However, in some instances, known or conventional details are not described so as to provide a brief discussion of embodiments of the present invention.

[0029] The "one embodiment" or "embodiment" mentioned in the specification means that the specific features, structures, or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present invention. The phrase "in one embodiment" appearing in various places in the specification does not necessarily all refer to the same embodiment.

[0030] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "vertical", "horizontal", "top", "bottom", "inside", "outside", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0031] The terms used herein are for the purpose of describing specific examples only and are not intended to be limiting of the examples. When used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise.

[0032] The wheat flour milling process includes many steps. In each milling process, the moisture of the flour entering the mill needs to be kept stable to ensure the normal progress of the milling process. In addition, the moisture of the flour entering the mill of the flour processing equipment generally needs to be kept within 15%. However, in the milling process, the moisture of the flour entering the mill will also vary greatly due to factors such as process type, raw material variety, product moisture requirements, product quality and output, moisture loss during the grinding process, climate and operating habits.

[0033] In addition, in the production state, during the flour grinding process, the higher the moisture content of the flour entering the mill, the better the precision and color of the product, but the flowability of the material is relatively poor, the moisture content of the product will also increase, and the storage time will be short. When the moisture content entering the mill exceeds a certain value, the production efficiency of the wheat deep processing equipment will be reduced. At the same time, in a stable production process, when the production output reaches certain requirements, the moisture content should be related to the precision and ash content of the flour. If the moisture content entering the mill has been determined, it should be kept stable and not fluctuate. This will be detrimental to the production output of the wheat deep processing equipment and the quality of the flour. Therefore, the present invention discloses an automatic water adding device in the wheat flour grinding process to accurately ensure the amount of water added to the flour.

[0034] like Figure 1-Figure 2 As shown, an automatic water adding device in the wheat flour grinding process is provided, comprising: a stirring bin 1, a feeding pipe 12, a discharging pipe, a stirring device, an imported flour moisture sensor 3, a flour flow rate sensor 2, a water flow rate sensor 7, a control device, a water supply device, a proportional valve 6, an air supply device for supplying compressed air, a gas-liquid mixing device 8, a solenoid valve 9 and a nozzle 10;

[0035] The feed pipe 12 and the discharge pipe are both connected to the stirring bin 1, the stirring device is arranged in the stirring bin 1, the imported flour moisture sensor 3 and the flour flow rate sensor 2 are arranged on the feed pipe 12, the sensing end of the imported flour moisture sensor 3 and the sensing end of the flour flow rate sensor 2 are both facing the inside of the feed pipe 12, the water supply device and the air supply device are both connected to the gas-liquid mixing device 8, the proportional valve 6 and the water flow rate sensor 7 are arranged on the connecting pipeline between the water supply device and the gas-liquid mixing device 8, the air supply device is connected to the gas-liquid mixing device 8, the gas-liquid mixing device 8 is connected to the nozzle 10, and the gas-liquid mixing device 8 and The solenoid valve 9 is arranged on the connecting pipeline of the nozzle 10, and the nozzle 10 is arranged on the pipe wall of the mixing chamber 1, facing the mixing chamber, and the output of the imported flour moisture sensor 3, the output of the flour flow rate sensor 2 and the output of the water flow rate sensor 7 are all connected to the input of the control device, and the output of the control device is respectively connected to the proportional valve 6 and the solenoid valve 9 (the connection of the control device, the proportional valve 6, the solenoid valve 9, the imported flour moisture sensor 3, the flour flow rate sensor 2, and the water flow rate sensor 7, and the installation of the imported flour moisture sensor 3, the flour flow rate sensor 2, the water flow rate sensor 7, the proportional valve 6 and the solenoid valve 9 on the pipeline adopt the existing technology).

[0036] The water flow rate sensor 7 can be an existing liquid flow sensor, and the imported flour moisture sensor 3 uses a microwave method to continuously measure the moisture of the flour. The control device can use a CPU or a PLC as the core and adopt a proportional integral algorithm.

[0037] As a preferred embodiment, the water flow rate sensor is an SM6000 electromagnetic flow rate meter.

[0038] As a preferred embodiment, it comprises at least four nozzles 10 and at least two solenoid valves 9, and at least four nozzles 10 are evenly arranged in the horizontal direction of the mixing chamber 1, so as to ensure uniform water spraying;

[0039] When the cross section of the stirring chamber 1 is circular, at least four nozzles 10 are evenly arranged in the circumferential direction of the stirring chamber 1 .

[0040] The gas-liquid mixing device 8 is connected to each of the nozzles 10 via a first connecting pipeline, and a solenoid valve 9 is provided on each of the first connecting pipelines;

[0041] Alternatively, in order to spray water more evenly, the gas-liquid mixing device 8 and every two nozzles 10 are connected via a second connecting pipeline, the two nozzles 10 connected to the second connecting pipeline are symmetrically arranged in the horizontal direction of the mixing chamber 1, and a solenoid valve 9 is arranged on each second connecting pipeline.

[0042] As a preferred embodiment, a release solenoid valve is provided on the connecting pipeline between the gas supply device and the gas-liquid mixing device 8, and the output of the control device is connected to the release solenoid valve.

[0043] The connection of the release solenoid valve on the pipeline, and the connection between the control device and the release solenoid valve all adopt the existing technology.

[0044] As a preferred embodiment, it also includes an outlet flour moisture sensor 11;

[0045] The outlet flour moisture sensor 11 is arranged on the discharge pipe, the sensing end of the outlet flour moisture sensor faces the inside of the discharge pipe, and the output of the outlet flour moisture sensor is connected to the input of the control device.

[0046] The outlet flour moisture sensor in this embodiment is used to detect whether the moisture of the flour after adding water reaches a preset flour moisture.

[0047] The outlet flour moisture sensor adopts a microwave method to continuously measure the moisture of the flour.

[0048] The connection of the outlet flour moisture sensor 11 on the pipeline and the connection of the outlet flour moisture sensor and the control device all adopt the existing technology.

[0049] As a preferred embodiment, a pressure gauge is provided on the connecting pipeline between the water supply device and the gas-liquid mixing device 8 for detecting the actual water pressure.

[0050] As a preferred embodiment, the water supply device includes a water storage tank 4 and a water pump 5;

[0051] The water storage tank 4 is connected to the water inlet of the water pump 5 , and the water outlet of the water pump 5 is connected to the gas-liquid mixing device 8 .

[0052] As a preferred embodiment, a pressure gauge is provided on the connecting pipeline between the gas supply device and the gas-liquid mixing device 8 for detecting the actual air pressure.

[0053] As a preferred embodiment, the stirring device comprises a stirring motor and a stirring blade, and the rotating shaft of the stirring motor is connected to the stirring blade. The stirring blade can evenly stir the flour and the atomized water.

[0054] The stirring motor can be installed in the stirring chamber by means of a mounting bracket or the like.

[0055] In a specific embodiment, the diameter of the water pipe is 4 mm, and the diameter of the nozzle 10 is 1 mm.

[0056] The flour flow rate sensor can be an SFI microwave solid flow rate flowmeter, and the inlet flour moisture sensor and the outlet flour moisture sensor can be an MS-A-210 microwave moisture meter. Microwaves are continuously emitted and reflected on the probe of the measured medium to form a propagation loop, and the moisture content of the flour is determined by calculating the energy absorbed by the microwave beam in the flour.

[0057] The working process of the automatic water adding device in the wheat flour grinding process of the present invention is as follows:

[0058] Start the water supply device and the air supply device, and open the flour feed (a flour feed valve is provided on the feed pipe 12, the outlet of the mill is connected to the feed pipe 12, and the flour from the mill enters the mixing bin 1 through the feed pipe 12);

[0059] The control device reads the flour moisture (flour moisture percentage) from the imported flour moisture sensor 3 and the flour flow rate from the flour flow rate sensor 2;

[0060] Sending the above data to the control device;

[0061] The control device determines whether the flour moisture is less than the preset flour moisture. If so,

[0062] Based on the above data, the flour flow rate in the control period T and the water flow rate in the control period T are calculated by the following formula; the control period is set to 10 seconds and can be specifically set according to needs (1) Calculation of moisture content in imported flour:

[0063] PEM=VP*WM

[0064] Wherein: VP is the flour flow rate passing through the flour control cycle (during calibration, it is known that the maximum flow rate of the flour flowmeter (at 20 mA current) is 120 L / min. If the control cycle T is 10 seconds, the maximum flow rate in each control cycle is 20 L / T. Therefore, based on the current of the flowmeter, the unit flow rate in the T cycle can be known, liters of flour / T).

[0065] WM is the flour moisture measured by the imported flour moisture sensor (the maximum humidity of the flour moisture meter (at 20 mA current) is known to be 20% during calibration). The humidity of the flour can be determined based on the current value, liters of water / liter of flour.

[0066] PEM: Flour moisture content during the control period (liters of moisture / T).

[0067] (2) Calculation of water addition:

[0068] W_REQ=W_SET-PEM

[0069] Among them, W_SET: set flour moisture (liter moisture / T), PEM: measured flour moisture (liter moisture / T), W_REQ: required amount of water to be added (liter moisture / T).

[0070] It can be understood that in the above formula, the control period T is 10 seconds, which can be adjusted as needed.

[0071] (3) Proportional valve opening control and calculation

[0072] According to the deviation E between the required water addition amount W_REQ within the control period T and the actual water flow rate W_SUP measured by the water flow rate sensor (calculated by multiplying the water flow rate measured by the water flow rate sensor by T), the PI (proportional integral) principle is adopted to control the opening D of the proportional valve within the control period. The formula of the control system transfer function is as follows:

[0073]

[0074] in:

[0075] T: Control cycle

[0076] E: Deviation, the amount of water added in the control cycle T W_REQ-the actual water flow rate W_SUP measured by the water flow sensor

[0077] D: Signal value (opening degree) output to the proportional valve

[0078] Kp: Proportional coefficient

[0079] Ti: integration coefficient

[0080] From the formula, we can see that the opening of the proportional valve is proportional to the size of the deviation. The larger the deviation and the larger the proportional coefficient, the larger the opening of the proportional valve.

[0081] In addition, the larger the proportional coefficient, the more sensitive the system is, the smaller the integral coefficient is, the more obvious the integral effect is, and the integral control follows the cumulative changes of the deviation to eliminate the residual phenomenon.

[0082] In order to ensure the uniformity of water addition, the control device automatically adjusts the number of nozzles opened according to the flow rate of flour.

[0083] In order to prevent the compressed air pressure from pushing back the water from the proportional valve 6 when all the electromagnetic valves 9 in front of the nozzle 10 are closed, a release electromagnetic valve is provided on the connecting pipeline between the air supply device and the gas-liquid mixing device 8. When all the electromagnetic valves 9 are closed and the proportional valve 6 is not yet closed, the release electromagnetic valve is in an open state to release the gas pressure, and the air inlet pressure of the gas-liquid mixing device 8 is equal to the atmospheric pressure; when a certain electromagnetic valve 9 is in an open state, the release electromagnetic valve is closed, and the gas-liquid mixing device 8 has all the air pressure, and forms high-pressure water (compressed air pressure is 4-6 kg / cm2) with water to enter the nozzle 10, thereby ensuring that the water of the nozzle 10 is sprayed out in the form of water mist.

[0084] In order to obtain a better atomization effect and make the flour and water more evenly added, the air pressure must be greater than the water pressure by 1.0-1.5kg / cm2. By increasing the gas pressure or reducing the liquid pressure, a finer (about 30 microns) droplet spray can be obtained. The fine droplet spray produced by the air atomizing nozzle 10 has an excellent humidification effect on the surrounding environment. Generally, the gas pressure is not adjusted, and the water pressure can be reduced by reducing the speed of the motor.

[0085] The automatic water adding device in the wheat grinding process of the present invention is equipped with an imported flour moisture sensor 3 on the feed pipe 12, so that the moisture of the flour can be continuously measured, and it can measure the moisture in the flour under the dynamic feeding condition. In addition, the number of nozzles 10 opened can be determined according to the flour flow rate at a preset time T to ensure uniform water addition. In addition, compared with the manual water adding method in the prior art, it also improves the production efficiency of flour water adding.

[0086] The above is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. An automatic water adding device in the wheat flour grinding process, characterized in that: include: Mixing bin, feeding pipe, discharging pipe, stirring device, imported flour moisture sensor, flour flow rate sensor, water flow rate sensor, control device, water supply device, proportional valve, air supply device for compressed air, gas-liquid mixing device, solenoid valve and nozzle; The feed pipe and the discharge pipe are both communicated with the stirring bin, the stirring device is arranged in the stirring bin, the inlet flour moisture sensor and the flour flow rate sensor are arranged on the feed pipe, the sensing end of the inlet flour moisture sensor and the sensing end of the flour flow rate sensor are both facing the inside of the feed pipe, the water supply device and the air supply device are both connected to the gas-liquid mixing device, the proportional valve and the water flow rate sensor are arranged on the connecting pipeline between the water supply device and the gas-liquid mixing device, the air supply device is connected to the gas-liquid mixing device, the gas-liquid mixing device is connected to the nozzle, the solenoid valve is arranged on the connecting pipeline between the gas-liquid mixing device and the nozzle, the nozzle is arranged on the pipe wall of the stirring bin, facing the inside of the stirring bin, the output of the inlet flour moisture sensor, the output of the flour flow rate sensor and the output of the water flow rate sensor are all connected to the input of the control device, and the output of the control device is respectively connected to the proportional valve and the solenoid valve; In response to the flour moisture being less than the preset flour moisture, the flour flow rate of the control period T and the water flow rate of the control period T are calculated by the following formula: (1) Calculation of moisture content in imported flour: PEM = VP * WM; Among them, VP is the flour flow rate flowing through the flour control cycle; WM is the flour moisture measured by the imported flour moisture sensor; PEM is the moisture content of flour in the control period T; (2) Calculation of water addition: W_REQ = W_SET-PEM; Among them, W_SET is the set flour moisture; PEM is the measured flour moisture; W_REQ is the required amount of water; (3) Proportional valve opening control and calculation: According to the deviation E between the required water addition amount W_REQ within the control period T and the actual water flow rate W_SUP measured by the water flow rate sensor, the PI principle is used to control the opening D of the proportional valve within the control period T. The formula of the control system transfer function is as follows: in: T is the control period; E is the deviation between the amount of water added W_REQ in the control period T and the actual water flow rate W_SUP measured by the water flow rate sensor; Kp is the proportionality coefficient; Ti is the integration coefficient.

2. The automatic water adding device in the wheat flour grinding process according to claim 1, characterized in that: The water flow rate sensor is an SM6000 electromagnetic flow rate meter.

3. The automatic water adding device in the wheat flour grinding process according to claim 1, characterized in that: It comprises at least four nozzles and at least two solenoid valves, and the at least four nozzles are evenly arranged in the horizontal direction of the stirring bin; The gas-liquid mixing device is connected to each of the nozzles via a first connecting pipeline, and one solenoid valve is arranged on each of the first connecting pipelines; Alternatively, the gas-liquid mixing device and every two of the nozzles are connected via a second connecting pipeline, the two nozzles connected to the second connecting pipeline are symmetrically arranged in the horizontal direction of the mixing chamber, and one solenoid valve is arranged on each second connecting pipeline.

4. The automatic water adding device in the wheat flour grinding process according to claim 1, characterized in that: A release solenoid valve is provided on the connecting pipeline between the gas supply device and the gas-liquid mixing device, and the output of the control device is connected to the release solenoid valve.

5. The automatic water adding device in the wheat flour grinding process according to claim 1, characterized in that: Also included is an outlet flour moisture sensor; The outlet flour moisture sensor is arranged on the discharge pipe, the sensing end of the outlet flour moisture sensor faces the inside of the discharge pipe, and the output of the outlet flour moisture sensor is connected to the input of the control device.

6. The automatic water adding device in the wheat flour grinding process according to claim 1, characterized in that: A pressure gauge is provided on the connecting pipeline between the water supply device and the gas-liquid mixing device.

7. The automatic water adding device in the wheat flour grinding process according to claim 1, characterized in that: The water supply device comprises a water storage tank and a water pump; The water storage tank is connected to the water inlet of the water pump, and the water outlet of the water pump is connected to the gas-liquid mixing device.

8. The automatic water adding device in the wheat flour grinding process according to claim 1, characterized in that: A pressure gauge is provided on the connecting pipeline between the gas supply device and the gas-liquid mixing device.

9. The automatic water adding device in the wheat flour grinding process according to claim 1, characterized in that: The stirring device comprises a stirring motor and stirring blades, and the rotating shaft of the stirring motor is connected to the stirring blades.

10. The automatic water adding device in the wheat flour grinding process according to claim 7, characterized in that: The water pump has a variable frequency speed regulation function.

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