Flour quality detection system and detection method

Abstract

The present invention provides a flour quality detection system and detection method, which mainly relate to the field of flour quality detection. By adding a sampling pipe on one side of the material guide pipe, the present invention can regularly sample the material in the material guide pipe through a spectrometer and perform a preliminary whiteness test, so as to timely detect the use status of the high square sieve. This device is also used in conjunction with the sampling method for flour detection, and regular secondary sampling is performed to meet the normal detection project requirements. The beneficial effect of the present invention is that the present invention can automatically sample the flour in closed transportation, timely feedback the failure problem of the high square sieve, and ensure the quality of the flour.

Description

Technical Field

[0001] The invention mainly relates to the field of flour quality detection, and specifically relates to a flour quality detection system and a detection method. Background Art

[0002] After the flour is ground by the mill, it is introduced into the high square sieve for screening. The final flour is divided into multiple grades such as fine flour, national standard flour, and inferior flour. The screening of the high square sieve can effectively control the quality of flour of different grades. When the flour is transported to the packaging process by the diversion channel and the auger, it is necessary to sample and test the flour to record the ash content, moisture, Baibai, fineness and other indicators of the flour, and adjust the wheat production process according to the data.

[0003] In the existing production process, since the flour production process is fully enclosed, sampling and random inspection can only be carried out at the end of the flour outlet. Since the flour has been filtered by multiple high-square sieves at the outlet, when one of the high-square sieves has a problem, it is difficult to show it in the sample parameters of the sampling test. Therefore, the feedback on the problem of the high-square sieve can only be completed through regular maintenance, and it is impossible to find the problem in time and make adjustments, which affects the quality of the flour. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, the present invention provides a flour quality detection system and detection method, which can automatically sample the flour in closed transportation, timely feedback the failure problems of the high square sieve, and ensure the quality of the flour.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A flour quality detection system comprises a plurality of high square sieves arranged in parallel, wherein a plurality of material guide pipes are connected to the bottom of the high square sieves, wherein the material guide pipes respectively convey flour products of different finenesses, a guide pipe is arranged on one side of the material guide pipe for conveying flour of different finenesses, an inlet is arranged between the top of the guide pipe and the material guide pipe, an outlet is arranged between the bottom of the guide pipe and the material guide pipe, a shunt pipe is arranged in the middle of the guide pipe, and the shunt pipe and the top and bottom parts of the guide pipe form a three-way structure; a cylindrical valve is rotatably arranged at the inlet, wherein the cylindrical valve is used to block the inlet, a material receiving port is arranged on the side of the cylindrical valve, a motor for driving the cylindrical valve to rotate is arranged on the outer side of the guide pipe, and a contraction valve is arranged on the top of the guide pipe Neck channel, the necking channel is a rectangular structure, one side of the necking channel is transparent, a spectrometer is arranged on one side of the transparent side panel of the necking channel, the top of the necking channel is a receiving hopper, a first plug valve is arranged at the bottom of the necking channel, a high-pressure blowing nozzle is arranged at the top of the opposite side of the transparent side panel of the necking channel, a flap valve is hinged on the top of the diverter pipe, the flap valve is used to control the connection between the upper and lower parts of the guide pipe or the connection between the top of the guide pipe and the diverter pipe, a butterfly valve is arranged at the bottom of the guide pipe, the butterfly valve is used to control the opening and closing of the guide outlet at the bottom of the guide pipe, a sample box is detachably arranged at the bottom of the diverter pipe, a second plug valve is arranged on the diverter pipe, and a detection sensor and an indicator light for detecting the sample are arranged at the bottom of the diverter pipe.

[0007] The material guiding pipeline is in a vertical state, the guide pipe is a curved pipe, and the diverter pipe is arranged at the curved part of the guide pipe.

[0008] The right limiting platform is arranged at the three-way structure part of the diverter pipe, and the left limiting platform is arranged at the bottom of the guide pipe. The bottom of the right limiting platform has a smooth transition with the diverter pipe, and the bottom of the left limiting platform has a smooth transition with the guide pipe. Both sides of the flap valve are adapted to the left limiting platform and the right limiting platform respectively.

[0009] The shunt pipe is a bent pipe, the top of the shunt pipe is connected to the guide pipe, and the bottom of the shunt pipe is bent to present a vertical state.

[0010] One side of the cylindrical valve is located in the material guiding pipeline, and the material receiving port is arranged along the axial direction of the cylindrical valve.

[0011] A flour quality detection method, using the above detection system to perform sampling detection on flour, the method comprising:

[0012] The material in the material guide pipe is sampled once every N time interval in the guide pipe, and the whiteness of the material is detected by a spectrometer in the necking channel;

[0013] If the whiteness of the material in the necking channel is within the standard range, the material will be released in the necking channel after the test, and the qualified samples of every K times will enter the sample box through the shunt pipe for secondary inspection. The secondary inspection is done by manual sampling to complete the quality inspection. The materials that have not reached the second inspection number will be released by the necking channel and returned to the material guide pipe through the outlet. The K value will be re-counted after each secondary inspection.

[0014] If the whiteness test result of the material in the necking channel exceeds the standard range, the sampled material will directly enter the sample box through the diversion pipe. If the fineness of the sample in the test item exceeds the standard fineness range, the high square screen corresponding to the sample will be shut down for maintenance.

[0015] Furthermore, when every K-th qualified sample enters the sample box, the detection priority of the sample is low, and when a sample whose whiteness detection exceeds the standard range in the necking channel enters the sample box, the detection priority of the sample is high.

[0016] Furthermore, the sampling action in each of the material guiding pipes is performed alternately.

[0017] Furthermore, when the whiteness of the material in the necking channel exceeds the standard range and enters the sample box, the K value is re-counted.

[0018] Furthermore, the quality inspection items for the secondary sampling include moisture, ash content, sand content, fineness, and processing accuracy. When the whiteness of the sample tested exceeds the standard range, the fineness test is carried out first.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] The present invention designs a closed flour sampling device, which can sample finished flour products of different grades that are closed and transported after screening by a high square sieve. The sampling process is in a closed state, which will not cause pollution to the flour, and will not cause flour splashing to cause safety accidents. The sampling device also realizes the preliminary whiteness detection of flour, and corresponds the flour fineness index to the whiteness index, reflecting the fineness state of the flour to a certain extent. When the whiteness index of the flour exceeds the limited range, the sample can be timely subjected to comprehensive manual detection, so as to timely discover the problem of the high square sieve and ensure the quality of the flour product.

[0021] The detection device cooperates with the sampling method to timely discover the screening fault of the high square sieve and accurately locate the faulty high square sieve, which solves the problem in the prior art that the screening fault of the high square sieve cannot be discovered in time after the flours of the same grade are mixed, thereby providing guarantee for the flour grading quality.

[0022] The present invention provides a method for sampling and testing flour by using the above-mentioned sampling device. The method has higher detection timeliness, more accurate data recording, reduces the flour sampling process, and improves the overall detection efficiency. In addition, the detection method can be accurate to the grinding mill corresponding to each group of screening mechanisms, and the detected data is more valuable for reference in the subsequent production line equipment parameter adjustment and process adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Attached Figure 1 It is a schematic diagram of the structure of the present invention;

[0024] Attached Figure 2 It is a schematic diagram of the sampling state structure of the sampling part of the inlet of the present invention;

[0025] Attached Figure 3 It is a schematic diagram of the structure of the state of the sample introduction guide tube of the sampling part of the introduction port of the present invention;

[0026] Attached Figure 4 The present invention Figure 1 A partial enlarged structural diagram of the middle part;

[0027] Attached Figure 5 The present invention Figure 1 A schematic diagram of the partial enlarged structure of part B of the middle guide tube in the conductive state of the upper and lower parts;

[0028] Attached Figure 6 The present invention Figure 1 A schematic diagram of the partial enlarged structure of part B showing the connection between the upper part of the middle guide tube and the shunt tube;

[0029] Attached Figure 7 It is a flow chart of the flour quality detection method of the present invention.

[0030] Numbers shown in the accompanying drawings: 1, material guide pipeline; 2, guide pipe; 3, diverter pipe; 4, necking channel; 5, cylindrical valve; 6, sample box; 7, flap valve; 11, inlet; 12, outlet; 21, left limiting platform; 31, right limiting platform; 32, second plug-in valve; 41, material receiving hopper; 42, spectrometer; 43, first plug-in valve; 44, high-pressure blowing nozzle; 51, material receiving port; 52, butterfly valve. DETAILED DESCRIPTION

[0031] The present invention will be further described with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art may make various changes or modifications to the present invention, and these equivalent forms also fall within the scope limited by the application.

[0032] like Figure 1-7As shown, a flour quality detection system described in the present invention includes several high square sieves arranged in parallel. The high square sieves screen the flour processed by the mill through the sieve grids arranged in layers, and finally gather and transport it through different material guide pipes 1 connected to the bottom of the high square sieve. The material guide pipes 1 transport flour products of different finenesses respectively, and finally guide the flour to the packaging link. In the present invention, a guide pipe 2 is set on one side of the material guide pipe 1 for transporting flour of different finenesses. The top of the guide pipe 2 is connected to the upper part of the material guide pipe 1, and the bottom of the guide pipe 2 is connected to the lower part of the material guide pipe 1, which is equivalent to adding a branch pipe to the material guide pipe 1. The guide pipe 2 is responsible for sampling the flour material transported in the material guide pipe 1. The entire sampling process is still closed, which can not only complete the sampling of flour, but also avoid the introduction of foreign substances into the flour during the sampling link to cause pollution.

[0033] There is an inlet 11 between the top of the guide tube 2 and the material guide pipe 1, and there is an outlet 12 between the bottom of the guide tube 2 and the material guide pipe 1. The guide tube 2 completes the flour sampling through the inlet 11. The flour sampled is initially tested in the guide tube and then enters the secondary sampling link or is directly guided back to the material guide pipe 1 for transportation. There is a shunt pipe 3 in the middle of the guide tube 2, and the shunt pipe 3 forms a three-way structure with the top and bottom parts of the guide tube 2. The shunt pipe 3 is the pipe for the sample for secondary sampling in the guide tube 2 to enter, and the secondary sampling is finally completed at the bottom of the shunt pipe 3, and the sample is manually removed for testing of several items.

[0034] Specifically, a cylindrical valve 5 is rotatably arranged at the inlet 11, and the cylindrical valve 5 is used to block the inlet 11. In coordination therewith, the portion of the top of the guide tube 2 that is connected to the inlet 11 is a rectangular channel, and the inlet 11 is a rectangular port, so that the cylindrical cylindrical valve 5 can complete the blocking of the rectangular channel at the top of the guide tube 2. A motor is provided on the outside of the guide tube 2 for driving the cylindrical valve 5 to rotate. To ensure the accuracy of the motor drive, a stepper motor or a servo motor is used as the motor. Driven by the motor, the cylindrical valve 5 can be driven to rotate stably. One side of the cylindrical valve 5 is located in the material guiding pipeline 1, and a material receiving port 51 is provided on the side of the cylindrical valve 5. The material receiving port 51 is provided along the axial direction of the cylindrical valve 5, and the material receiving port 51 is used to sample flour. When sampling, such as Figure 2 As shown, the material receiving port 51 rotates clockwise from downward to upward under the rotation drive of the motor, and the flour is filled in the material receiving port 51 when it falls in the introduction port 11 to complete the sampling. Then, the motor drives the cylindrical valve 5 to rotate toward one side of the guide tube 2, as shown in FIG. Figure 3As shown, when the material receiving port 51 rotates into the guide pipe 2, the sampled flour is released into the guide pipe 2. By rotating the cylindrical valve 5, the sample can be taken from the material guiding pipe 1 through the material receiving port 51 and the flour sample can be released into the guide pipe 2. During the entire rotation process, since the material receiving port 51 has received the sample, the guide pipe 2 and the material guiding pipe 1 are always kept relatively closed, thereby preventing the flour from being contaminated.

[0035] A constricted channel 4 is arranged on the top of the guide tube 2, one side of the constricted channel 4 is transparent, the transparent side of the constricted channel 4 is a rectangular structure, and a spectrometer 42 is arranged on one side of the transparent side panel of the constricted channel 4. The spectrometer 42 is used to detect the whiteness of the flour sampled in the constricted channel 4, and detect whether the whiteness of the flour is within a specified range. This detection link corresponds to the fineness of the flour by detecting the whiteness of the sampled flour. Since the larger the mesh number of the flour is during screening, the smaller the fineness and the higher the whiteness, the difference in the detected whiteness can reflect the fineness of the flour to a certain extent, so that the screening condition of the high square sieve grid running on it can be monitored through this detection link, and the failure of the high square sieve can be discovered in time.

[0036] Specifically, the top of the necking channel 4 is a receiving hopper 41, which connects the rectangular channel at the top of the guide tube 2 and the receiving hopper 41 of the necking channel 4, so as to facilitate the smooth introduction of the sample of the guide tube 2 into the necking channel 4 for testing. A first plug valve 43 is arranged at the bottom of the necking channel 4, and the first plug valve 43 uses a rectangular plug to block the bottom of the necking channel 4. The first plug valve 43 is used to limit the sample in the necking channel 4. When the whiteness test is completed, the first plug valve 43 contracts to complete the opening of the necking channel 4, so that the sample in the necking channel 4 is released to the bottom. Furthermore, a high-pressure nozzle 44 is arranged at the top of the opposite side of the transparent side panel of the necking channel 4, and the high-pressure nozzle 44 is connected to the high-pressure gas source through a pipeline, wherein a filtering device is installed between the gas source and the high-pressure nozzle 44 to prevent the sample from being contaminated. When the test is completed, the first gate valve 43 is opened, and after the sample falls, the high-pressure gas of the high-pressure blowing nozzle 44 is used to blow the sample so that the material in the necking channel 4 is completely blown off, and then the first gate valve 43 is closed, waiting for the flour in the guide tube 2 to fall and settle. The blowing action of the high-pressure blowing nozzle 44 can make the flour sample fall completely, avoiding adhesion with the transparent side plate of the necking channel 4 and affecting the whiteness test results of the next batch of samples.

[0037] The flap valve 7 is hingedly connected to the top of the shunt pipe 3, and the flap valve 7 is used to control the communication between the upper and lower parts of the guide pipe 2 or the communication between the top of the guide pipe 2 and the shunt pipe 3. The flap valve 7 is driven by a cylinder, and the sampled flour can be diverted by the flap valve 7, so that the sample can smoothly return to the guide pipe 1 or enter the sample box 6 for secondary sampling. Specifically, in order to ensure that the flap valve 7 can well seal both channels at the three-way structure, in this embodiment, the right limiting platform 31 is provided at the three-way structure portion of the shunt tube 3, and the left limiting platform 21 is provided at the bottom of the guide tube 2 at the three-way structure portion. The bottom of the right limiting platform 31 is in a rounded transition with the shunt tube 3, and the bottom of the left limiting platform 21 is in a rounded transition with the guide tube 2. The two sides of the flap valve 7 are respectively adapted to the left limiting platform 21 and the right limiting platform 31. When the flap valve 7 is flipped to the side of the shunt tube 3, the flap valve 7 can be completely fitted with the right limiting platform 31 to complete the blocking of the shunt tube 3, so that the sample returns to the material guide pipe 1 through the bottom of the guide tube 2. When the flap valve 7 is flipped to the side of the guide tube 2, the flap valve 7 can be completely fitted with the left limiting platform 21 to complete the blocking of the bottom of the guide tube 2, so that the sample enters the sample box 6 through the shunt tube 3 to complete the secondary sampling.

[0038] A butterfly valve 52 is provided at the bottom of the guide pipe 2, and the butterfly valve 52 is also driven by a cylinder. The butterfly valve 52 is used to control the opening and closing of the guide outlet 12 at the bottom of the guide pipe 2. The butterfly valve 52 is in an open state only when the flap valve 7 is flipped to the side of the diverter pipe 3 to connect the top and the bottom of the guide pipe 2, and the first plug valve 43 is opened to realize the falling of the sample. At this time, the flour material in the material guide pipe 1 descends faster and the pressure is lower, so that the sample refluxed in the guide pipe 2 can be effectively drained under negative pressure, so that the sample can completely and smoothly flow back into the material guide pipe 1.

[0039] A sample box 6 is detachably provided at the bottom of the shunt tube 3. The sample box 6 can be installed at the bottom of the shunt tube 3 by a thread or a snap-on structure. Preferably, the sample box 6 is made of a food-grade transparent material, and the sample box 6 is sealed and connected to the connection part at the bottom of the shunt tube 3. A second gate valve 32 is provided on the shunt tube 3. The valve plate of the second gate valve 32 is circular. The second gate valve 32 is used to close the bottom of the shunt tube 3. When the flour sample in the sample box 6 is taken, the second gate valve 32 is closed to prevent the entire system from being connected to the outside world and causing pollution or causing a safety accident. A detection sensor and an indicator light for detecting the sample are provided at the bottom of the shunt tube 3. The detection sensor is used to detect whether there is a sample in the sample box 6. When there is a sample in the sample box 6, the indicator light lights up to indicate that the sample sampling is successful.

[0040] Specifically, the material guide pipe 1 is in a vertical state, the guide pipe 2 is a curved pipe, and the shunt pipe 3 is arranged at the curved part of the guide pipe 2. This structure makes the shunt pipe 3 and the bottom of the guide pipe 2 form a bifurcated structure compared with the top of the guide pipe 2, so that the bottom of the guide pipe 2 and the shunt pipe 3 can both maintain a certain vertical state, thereby ensuring the smooth fall of the sample. More specifically, in order to ensure the vertical angle of the guide pipe 2, the shunt pipe 3 also adopts a curved structure, so that the bottom of the shunt pipe 3 can be completely vertical, thereby facilitating the collection and use of the flour sample in the sample box 6.

[0041] A flour quality detection method, using the above detection system to sample and detect flour, the method comprises the following steps:

[0042] The guide pipe 2 samples the material in the material guide pipe 1 once every N interval, where N can be 1 to 6 hours, and the management personnel can set it according to the flow rate and specifications of the equipment in the factory. When sampling, the cylindrical valve 5 slowly rotates clockwise for one circle, and the flour in the material guide pipe 1 is sampled and introduced into the guide pipe 2 through the material receiving port 51.

[0043] The flour sample is blocked by the first gate valve 43 in the constricted channel 4, so that the sample is filled in the narrow constricted channel 4. The filling of the sample in the constricted channel 4 is in an interference state, so the constricted channel 4 is filled with the sample. Then, the whiteness of the flour is tested by the spectrum detector 42.

[0044] If the whiteness of the sample in the necking channel 4 is within the standard range specified by the graded flour (national standard or enterprise standard, set by the manufacturer), the material is released in the necking channel 4 after the test, and every K-th qualified sample enters the sample box 6 through the shunt pipe 3 for secondary sampling. The K value is 3-6, which can be set by the manufacturer according to the flour flow rate. When the sample is diverted to the sample box 6, the flap valve 7 connects the top of the guide pipe 2 with the shunt pipe 3, the first plug valve 43 is opened, and then the high-pressure blowing nozzle 44 is started to purge the sample in the necking channel 4 completely. Then the first plug valve 43 is closed, and after waiting for 1 minute for the sample to settle in the sample box 6, the second plug valve 32 closes the channel. At this time, the indicator light is on and the sample can be removed.

[0045] The secondary inspection is done by manual sampling to complete the quality inspection. The materials that have not reached the secondary inspection times are released by the necking channel 4 and then returned to the material guide pipe 1 through the outlet 12, wherein the K value is re-counted after each secondary inspection. When the whiteness of the material in the necking channel 4 exceeds the standard range and enters the sample box 6, the K value is also re-counted.

[0046] If the whiteness detection of the material in the necking channel 4 exceeds the standard range, the sampled material will directly enter the sample box 6 through the shunt pipe 3. When each K-th qualified sample enters the sample box 6, the detection priority of the sample is low. When the sample whose whiteness detection in the necking channel 4 exceeds the standard range enters the sample box 6, the detection priority of the sample is high. Low-priority samples are distinguished from high-priority samples by the color of the indicator light. The detection items of the secondary random inspection include moisture, ash content, sand content, fineness, processing accuracy, etc. Among them, when the sample to be inspected is a sample whose whiteness exceeds the standard range, the fineness is detected first. Regardless of the state of the secondary random inspection, if the fineness of the sample in the detection item exceeds the standard fineness range, the high square screen corresponding to the sample must be shut down for maintenance to check whether the screen and flat material blocks of the high square screen need to be replaced.

[0047] Specifically, the sampling actions in each material guiding pipe 1 are performed alternately, so that the sample sampling operations in the sample box 6 can be performed alternately, which is more convenient for the operator to arrange the detection work reasonably.

[0048] This detection method relies on the above sampling equipment for operation. In order to facilitate the sampling of samples, the detection room can be built below the second floor where the high square sieve is located, thereby shortening the sampling time and improving the detection efficiency.

Claims

1. A flour quality detection system, comprising a plurality of high square sieves arranged in parallel, wherein a plurality of material guide pipes (1) are connected to the bottom of the high square sieves, and the material guide pipes (1) are used to transport flour products of different finenesses respectively, characterized in that: A guide pipe (2) is arranged on one side of the material guide pipe (1) for conveying flour of different finenesses, an inlet (11) is provided between the top of the guide pipe (2) and the material guide pipe (1), an outlet (12) is provided between the bottom of the guide pipe (2) and the material guide pipe (1), a diverter pipe (3) is provided in the middle of the guide pipe (2), and the diverter pipe (3) and the top and bottom parts of the guide pipe (2) form a three-way structure; a cylindrical valve (5) is rotatably arranged at the inlet (11), the cylindrical valve (5) is used to block the inlet (11), a material receiving port (51) is arranged on the side of the cylindrical valve (5), a motor for driving the cylindrical valve (5) to rotate is arranged on the outside of the guide pipe (2), a necking channel (4) is arranged on the top of the guide pipe (2), the necking channel (4) is a rectangular structure, one side of the necking channel (4) is in a transparent state, and the necking channel (4) is in a rectangular structure. A spectrometer (42) is arranged on one side of the transparent side plate of the neck channel (4); a receiving hopper (41) is arranged at the top of the neck channel (4); a first plug valve (43) is arranged at the bottom of the neck channel (4); a high-pressure blowing nozzle (44) is arranged at the top of the neck channel (4) on the opposite side of the transparent side plate; a flap valve (7) is hingedly connected to the top of the shunt tube (3); the flap valve (7) is used to control the connection between the upper and lower parts of the guide tube (2) or the connection between the top of the guide tube (2) and the shunt tube (3); a butterfly valve (52) is arranged at the bottom of the guide tube (2); the butterfly valve (52) is used to control the opening and closing of the guide outlet (12) at the bottom of the guide tube (2); a sample box (6) is detachably arranged at the bottom of the shunt tube (3); a second plug valve (32) is arranged on the shunt tube (3); and a detection sensor and an indicator light for detecting the sample are arranged at the bottom of the shunt tube (3).

2. A flour quality detection system according to claim 1, characterized in that: The material guiding pipe (1) is in a vertical state, the guide pipe (2) is a bent pipe, and the flow dividing pipe (3) is arranged at the bent portion of the guide pipe (2).

3. A flour quality detection system according to claim 2, characterized in that: The diverter pipe (3) is provided with a right limiting platform (31) at the three-way structure portion, and the bottom of the guide pipe (2) is provided with a left limiting platform (21) at the three-way structure portion. The bottom of the right limiting platform (31) is in a rounded transition with the diverter pipe (3), and the bottom of the left limiting platform (21) is in a rounded transition with the guide pipe (2). Both sides of the flap valve (7) are adapted to the left limiting platform (21) and the right limiting platform (31) respectively.

4. A flour quality detection system according to claim 2, characterized in that: The shunt pipe (3) is a bent pipe, the top of the shunt pipe (3) is connected to the guide pipe (2), and the bottom of the shunt pipe (3) is bent to present a vertical state.

5. A flour quality detection system according to claim 1, characterized in that: One side of the cylindrical valve (5) is located in the material guiding pipe (1), and the material receiving opening (51) is arranged along the axial direction of the cylindrical valve (5).

6. A flour quality detection method, characterized in that: Flour is sampled and tested using the detection system according to any one of claims 1 to 5, the method comprising: The guide pipe (2) samples the material in the material guide pipe (1) once at every time interval N, and the material is tested for whiteness by a spectrometer (42) in the necking channel (4); If the whiteness of the material in the necking channel (4) is detected to be within the standard range, the material is released from the necking channel (4) after the detection, and the qualified samples of each Kth time enter the sample box (6) through the shunt pipe (3) for secondary inspection. The secondary inspection is performed by manual sampling to complete the quality inspection. The material that has not reached the second inspection number is released from the necking channel (4) and returned to the material guide pipe (1) through the outlet (12), wherein the K value is re-counted after each secondary inspection; If the whiteness of the material in the necking channel (4) exceeds the standard range, the sampled material directly enters the sample box (6) through the diversion pipe (3). If the fineness of the sample in the test item exceeds the standard fineness range, the high square screen corresponding to the sample is shut down for maintenance.

7. A flour quality detection method according to claim 6, characterized in that: When every K-th qualified sample enters the sample box (6), the detection priority of the sample is low. When a sample whose whiteness detection exceeds the standard range in the necking channel (4) enters the sample box (6), the detection priority of the sample is high.

8. A flour quality detection method according to claim 6, characterized in that: The sampling action in each of the material guiding pipes (1) is performed alternately.

9. A flour quality detection method according to claim 6, characterized in that: When the whiteness of the material in the necking channel (4) exceeds the standard range and enters the sample box (6), the K value is re-counted.

10. A flour quality detection method according to any one of claims 6 to 9, characterized in that: The quality inspection items for the secondary sampling include moisture, ash content, sand content, fineness, and processing accuracy. When the whiteness of the sample tested exceeds the standard range, the fineness test is carried out first.

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