A method and device for detecting needle-like shapes of coarse aggregate

Abstract

The present invention relates to the field of needle-like and flake-like detection of concrete, and in particular to a method and device for detecting needle-like and flake-like coarse aggregates. The detection method adopts a pre-separation method to preliminarily select needle-like particle samples and flake-like particle samples respectively, thereby reducing the number of particles detected by a needle-like gauge and the number of particles detected by a flake-like gauge, thereby improving the efficiency of needle-like and flake-like detection of coarse aggregates and reducing the labor intensity of operators performing needle-like and flake-like detection of coarse aggregates. The detection device is simple in design, convenient in operation, easy to learn and master, and combines physical screening and gauge inspection when performing needle-like and flake-like detection of coarse aggregates, thereby improving the accuracy of screening, reducing manual operation, reducing the labor intensity of personnel, shortening the detection time, and reducing the cost, and can be used for needle-like and flake-like detection of large quantities of coarse aggregates.

Description

Technical Field

[0001] The invention relates to the field of needle-like flake detection of concrete, and in particular to a method and a device for detecting needle-like flakes of coarse aggregate. Background Art

[0002] As an indispensable structural material in construction projects, the quality of concrete is directly related to the safety and durability of the project. Among the raw materials of concrete, the particle morphology of coarse aggregate has a significant impact on the workability, strength and durability of concrete. In particular, the content of needle-like particles will reduce the uniformity and crack resistance of concrete and increase the risk of cracks in the structure. Therefore, the accurate determination of the content of needle-like particles in coarse aggregate is particularly important. The current national standard "Pebble and Crushed Stone for Construction" GB / T 14685-2022 and the industry standard "Test Procedure for Aggregates for Highway Engineering" JTG 3432-2024 all use the gauge method for testing.

[0003] However, the gauge method requires manual identification of needle-shaped particles and flake-shaped particles in the sample one by one. This process is not only cumbersome and tests the eyesight of the test personnel, but also time-consuming. The long-term manual selection and judgment consumes a lot of physical strength and energy of the operator, increasing the labor intensity. Since each particle needs to be inspected, the detection efficiency is low and it is not suitable for large-scale or high-frequency detection needs. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of low detection efficiency and high labor intensity in the concrete needle-like flake detection process in the prior art, and to provide a coarse aggregate needle-like flake detection method and device.

[0005] In a first aspect, the present invention provides a method for detecting needle-like flakes in coarse aggregate, comprising: S1: Primary screening of coarse aggregate: Screen the coarse aggregate according to the particle size to obtain samples of different particle sizes; S2: Pre-separation of needle-shaped particle samples: Pre-separation of needle-shaped particles is performed on samples of a specified particle size to obtain needle-shaped particle samples and remaining samples; S3: Needle-shaped particle sample verification: Use a needle-shaped gauge to test the needle-shaped particle sample particle by particle; S4: Pre-separation of flake particle samples: pre-separation of flake particles is performed on the remaining samples to obtain flake particle samples; S5: Verification of flake particle samples: Use a flake gauge to inspect the flake particle samples grain by grain.

[0006] The present invention discloses a method for detecting needle-like flakes of coarse aggregates. The method uses a primary screening to screen the coarse aggregates into different particle size samples as required by the regulations according to the particle size. When performing needle-like flake detection on the samples of the designated particle size, the samples of the designated particle size are firstly pre-separated into needle-like particle samples and remaining samples. The particles that do not meet the needle-like particle characteristics are separated by the pre-separation operation, thereby reducing the detection amount of the samples by the needle-like gauge. The needle-like particle samples are then inspected particle by particle by particle by the needle-like gauge, thereby determining the specific number of needle-like particles and completing the needle-like particle detection. The remaining samples are subjected to flake particle detection. The present invention provides a method for needle-like and flake-like detection of coarse aggregate, which adopts a pre-separation method to preliminarily select needle-like particle samples and flake-like particle samples respectively, thereby reducing the number of particles detected by the needle-like gauge and the number of particles detected by the flake-like gauge, thereby improving the efficiency of needle-like and flake-like detection of coarse aggregate and reducing the labor intensity of operators performing needle-like and flake-like detection of coarse aggregate.

[0007] Preferably, in S3, the method of using a needle gauge to inspect the needle-shaped particle sample particle by particle is: comparing the maximum one-dimensional size of a single needle-shaped particle sample with the comparison interval on the needle gauge.

[0008] A comparison interval corresponding to the particle size sample is set on the needle gauge. By taking a single needle-shaped particle sample and comparing it with the corresponding comparison interval, the particle whose maximum one-dimensional size exceeds the length of the comparison interval is a needle-shaped particle.

[0009] Preferably, in S5, the method of using a sheet gauge to perform a grain-by-grain inspection on the flaky particle sample is: comparing the minimum one-dimensional size of a single flaky particle sample with a comparison interval on the sheet gauge.

[0010] A comparison interval corresponding to the particle size sample is set on the flake gauge. By taking a single flake particle sample and comparing it with the corresponding comparison interval, the particle whose smallest one-dimensional size is smaller than the width of the comparison interval is a flake particle.

[0011] Preferably, in S1, the coarse aggregate is screened into samples of six particle sizes using a grading screen.

[0012] According to the testing regulations, when conducting needle-flake testing on coarse aggregate, the coarse aggregate needs to be screened into samples of six particle sizes, and needle-flake testing must be conducted on the samples of the six particle sizes respectively.

[0013] In the second aspect, the present invention provides a device for detecting needle-like flakes in coarse aggregates, the device for detecting needle-like flakes in coarse aggregates is used in the above-mentioned method for detecting needle-like flakes in coarse aggregates, the device for detecting needle-like flakes in coarse aggregates comprises a needle-like screening mechanism and a flake-like screening mechanism, the needle-like screening mechanism can pre-separate needle-like particle samples in coarse aggregates by shaking, and the flake-like screening mechanism can pre-separate flake-like particle samples in coarse aggregates by vibrating.

[0014] The present invention provides a device for needle-like and flake-like detection of coarse aggregates. The needle-like screening mechanism is used for pre-separating needle-like particle samples so that samples of a specified particle size are screened into needle-like particle samples and remaining samples. The flake-like screening mechanism is used for pre-separating flake-like particle samples so that the flake-like particle samples in the remaining samples are separated from the samples that do not meet the test requirements. Through the pre-separation operation, the detection sample volume of the needle-like gauge and the flake-like gauge is reduced, thereby improving the efficiency of the needle-like and flake-like detection of coarse aggregates.

[0015] Preferably, the needle-shaped screening mechanism has a screening space, a feeding port and a discharging port, a sieve plate is provided in the screening space, the sieve plate divides the screening space into an upper space and a lower space, the feeding port is connected to the upper space, and the discharging port is connected to the lower space; a plurality of square sieve holes are provided on the sieve plate, the upper space and the lower space are connected through the square sieve holes, and the sieve plate is parallel to the bottom surface of the lower space.

[0016] The sieve plate separates the screening space into an upper space and a lower space. The operator feeds a sample of specified particle size into the upper space through the feeding port, and shakes the needle-shaped screening mechanism to allow the sample to pass through the square sieve hole into the lower space. In the screening process, particles that roughly meet the specifications of needle-shaped particles stay in the square sieve hole due to abutting the bottom surface of the lower space because their length exceeds the distance from the sieve plate to the bottom surface of the lower space. The samples that fall into the lower space and can be discharged from the discharge port are the remaining samples.

[0017] Preferably, the aperture of the square sieve hole is 120% of the maximum allowable aperture of the specified particle size; the distance between the square sieve hole and the bottom surface of the lower space is 110% of the maximum allowable aperture of the specified particle size.

[0018] If the particles are not needle-shaped, they will quickly pass through the square holes, improving the separation efficiency of needle-shaped particle samples.

[0019] Preferably, the sheet screening mechanism includes a plug spacer, a bottom plate, a first bent plate and a second bent plate, the first bent plate and the second bent plate are respectively connected to the bottom plate, the first bent plate and the second bent plate are arranged opposite to each other, the first bent plate has a first bending portion, the second bent plate has a second bending portion, the first bent portion and the second bent portion are arranged opposite to each other, one end of the plug spacer is connected to the first bent portion, and the other end is connected to the second bent portion, the first bent portion and the second bent portion are arranged at intervals to form a screening channel, and the plug spacer is used to limit the width of the screening channel.

[0020] The cross-section of the flake screening mechanism is an 8-shaped structure with an opening on the top. The first bending plate and the second bending plate are arranged relative to each other, and the first bending portion and the second bending portion are arranged opposite to each other, so that the top of the flake screening mechanism forms a funnel-shaped structure. The screening channel formed by the first bending portion and the second bending portion being arranged at intervals is located at the lowest point of the funnel-shaped structure, which is convenient for flake particle samples smaller than the width of the screening channel to pass through the screening channel through vibration, thereby pre-separating the flake particle samples; by controlling the size of the plug inserted into the screening channel, the plug controls the width of the screening channel, and is suitable for screening flake particle samples of specified particle grade samples; space is reserved at the bottom of the screening channel to facilitate the falling of flake particle samples.

[0021] Preferably, the bottom plate, the first bent plate and the second bent plate are integrally formed structural members formed by bending the entire plate, and one end of the spacer is detachably connected to the first bent portion, and the other end is detachably connected to the second bent portion.

[0022] The one-piece structural parts have better structural strength, and the one-piece structural parts of the steel structure have a certain ductility. The width of the screening channel can be changed by inserting plugs of different specifications, so that the flake screening mechanism can be used for pre-separation of flake particle samples of different particle sizes; it is easy to use.

[0023] Preferably, the plug spacers are respectively provided at both ends of the screening channel.

[0024] In order to ensure the stability of the screening channel and the screening effect of the flaky particle sample, screening elements are respectively arranged at both ends of the screening channel.

[0025] Compared with the prior art, the present invention has the following beneficial effects: 1. A method for detecting needle-like flakes of coarse aggregates of the present invention is to screen the coarse aggregates into different particle size samples as required by regulations according to the particle size through preliminary screening. When performing needle-like flake detection on the samples of the designated particle size, the samples of the designated particle size are firstly pre-separated into needle-like particle samples and remaining samples. The particles that do not meet the needle-like particle characteristics are separated through the pre-separation operation, thereby reducing the detection amount of the samples by the needle-like gauge. Then, the needle-like particle samples are inspected particle by particle through the needle-like gauge, thereby determining the specific number of needle-like particles and completing the needle-like particle detection. The remaining samples are subjected to flake detection. Pre-separation of particle samples, separating flake particle samples that meet the characteristics of flake particles from the remaining samples, and then using a flake gauge to test the flake particle samples particle by particle, so as to determine the number of flake particles; a method for needle-like and flake-like detection of coarse aggregates of the present invention adopts a pre-separation method to preliminarily select needle-like particle samples and flake-like particle samples, thereby reducing the number of particles detected by the needle gauge, thereby improving the efficiency of needle-like and flake-like detection of coarse aggregates and reducing the labor intensity of operators performing needle-like and flake-like detection of coarse aggregates; 2. A device for needle-shaped and flake-shaped detection of coarse aggregate of the present invention, wherein the needle-shaped screening mechanism is used for pre-separating needle-shaped particle samples, so that samples of a specified particle size are screened into needle-shaped particle samples and remaining samples; the flake-shaped screening mechanism is used for pre-separating flake-shaped particle samples, so that the flake-shaped particle samples in the remaining samples are separated from the samples that do not meet the test requirements. Through the pre-separation operation, the detection sample volume of the needle-shaped gauge and the flake-shaped gauge is reduced, and the efficiency of needle-shaped and flake-shaped detection of coarse aggregate is improved; 3. The device for detecting needle-like flakes of coarse aggregate of the present invention has a simple design, convenient operation, and is easy to learn and master. It combines physical screening and gauge inspection when conducting needle-like flake detection of coarse aggregate, thereby improving the accuracy of screening, reducing manual operation, reducing labor intensity, shortening detection time, and reducing costs. It can be used for needle-like flake detection of large quantities of coarse aggregate and has good economic and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a needle-shaped screening mechanism of a coarse aggregate needle-shaped flake detection device of the present invention; Figure 2 It is a schematic cross-sectional structural diagram of the needle-shaped screening mechanism of the present invention; Figure 3 It is a structural schematic diagram of the sheet screening mechanism of the present invention; Figure 4 It is a schematic flow chart of a method for detecting needle-like flakes of coarse aggregate according to the present invention.

[0027] Reference numerals: 1-needle-shaped screening mechanism, 11-square screen hole, 12-screen plate, 13-feeding port, 14-discharge port, 15-screening space, 151-upper space, 152-lower space, 153-bottom surface of lower space, 2-sheet screening mechanism, 21-bottom plate, 22-first bending plate, 23-second bending plate, 24-plug spacer, 25-first bending part, 26-second bending part, 27-locking nut, 28-screening channel. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with specific embodiments. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0029] Unless otherwise specified, in the description of the specific embodiments of the present invention, the terms indicating the orientation or position relationship such as "up", "down", "left", "right", "center", "inside", "outside", etc. are all based on the expression of the orientation or position relationship shown in the drawings, or are the orientation or position relationship when the invented product / equipment / device is usually used. These terms of orientation or position relationship are only for the convenience of describing the scheme of the present invention or simplifying the description in the specific embodiments, so as to facilitate the technicians to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, if the terms "horizontal", "vertical", "overhanging", "parallel" and the like appear, it does not mean that the corresponding devices / components / elements are required to be absolutely horizontal or vertical or overhanging or parallel, but may be slightly tilted or have deviations. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but may be slightly tilted. Alternatively, it can be simplified to mean that the corresponding devices / components / elements are set in directions such as "horizontal", "vertical", "overhanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, and more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its role in the scheme of the present invention.

[0031] In addition, the expressions “first”, “second”, “third”, etc., which appear in the terms, are merely used to distinguish the description of the same or similar components and should not be understood as emphasizing or implying the relative importance of specific components.

[0032] In addition, in the description of the embodiments of the present invention, "several", "plurality" and "a number" represent at least 2. It can be any number such as 2, 3, 4, 5, 6, 7, 8, 9, and even more than 9.

[0033] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, the terms "set", "install", "connect", "connected", "provided with", "laid", and "arranged" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, and can be welding, riveting, bolting, threading, and other commonly used connection means in the field. This connection can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0034] Example 1 like Figure 1-Figure 3 As shown, a device for detecting needle-flake shape of coarse aggregate is used in a method for detecting needle-flake shape of coarse aggregate. The device for detecting needle-flake shape of coarse aggregate comprises a needle-shaped screening mechanism 1 and a flake-shaped screening mechanism 2. The needle-shaped screening mechanism 1 can pre-separate needle-shaped particle samples from the coarse aggregate by shaking, and the flake-shaped screening mechanism 2 can pre-separate flake-shaped particle samples from the coarse aggregate by vibrating.

[0035] The needle screening mechanism 1 is used for pre-separating needle-shaped particle samples, so that samples of specified particle size are screened into needle-shaped particle samples and remaining samples; the flake screening mechanism 2 is used for pre-separating flake particle samples, and separating the flake particle samples in the remaining samples from the samples that do not meet the test requirements. Through the pre-separation operation, the detection sample volume of the needle gauge and the flake gauge is reduced, and the efficiency of the needle and flake detection of coarse aggregate is improved.

[0036] In one or more embodiments, the needle-shaped screening mechanism 1 has a screening space 15, a feeding port 13 and a discharging port 14. A sieve plate 12 is provided in the screening space 15, and the screening space 15 is divided into an upper space 151 and a lower space 152 by the sieve plate 12. The feeding port 13 is connected to the upper space 151, and a sample of a specified particle size can be fed into the upper space 151 through the feeding port 13. The discharging port 14 is connected to the lower space 152, and the sample passing through the discharging port 14 is used as the remaining sample; A plurality of square sieve holes 11 are provided on the plate 12, and the upper space 151 and the lower space 152 are connected through the square sieve holes 11. The sieve plate 12 is parallel to the bottom surface 153 of the lower space. The size of the square sieve holes 11 is adapted to the needle-shaped particles of a specified particle size, so that the needle-shaped particle samples of the specified particle size can fall into the square sieve holes 11. By controlling the distance between the bottom surface 153 of the lower space and the square sieve holes 11, the needle-shaped particle samples are prevented from falling out of the square sieve holes 11, thereby realizing the separation of the needle-shaped particle samples from the remaining samples.

[0037] Specifically, when the coarse aggregate is graded and initially screened, a standard test sieve is used to overlap the test sieves with apertures of 4.75mm, 9.5mm, 16mm, 19mm, 26.5mm, 31.5mm... from small to large, and the sample is put in for screening test; the first particle size is in the range of aperture 4.75mm to aperture 9.5mm, the second particle size is in the range of aperture 9.5mm to aperture 16mm, the third particle size is in the range of aperture 16mm to aperture 19mm, the fourth particle size is in the range of aperture 19mm to aperture 26mm, and so on, to obtain samples of different particle sizes, the allowed passing size of particles of the first particle size is in the range of 4.75mm to 9.5mm.

[0038] In an optional embodiment, the aperture of the square sieve hole 11 is 120% of the maximum allowable aperture of the specified particle size; the distance between the square sieve hole 11 and the bottom surface 153 of the lower space is 110% of the maximum allowable aperture of the specified particle size; for example, in the fourth particle size with an aperture of 19 mm to 26 mm, the aperture of the square sieve hole 11 of the needle-shaped screening mechanism 1 is 26.5* (1+20%) mm, and the distance between the square sieve hole 11 of the needle-shaped screening mechanism 1 and the bottom surface 153 of the lower space is 26.5* (1+10%) mm.

[0039] In one or more embodiments, the cross-section of the sheet-like screening mechanism 2 is an 8-shaped structural member with an opening at the top, and the sheet-like screening mechanism 2 includes a plug spacer 24, a bottom plate 21, a first bent plate 22 and a second bent plate 23, the first bent plate 22 and the second bent plate 23 are respectively connected to the bottom plate 21, the first bent plate 22 and the second bent plate 23 are arranged opposite to each other, the first bent plate 22 has a first bent portion 25, the second bent plate 23 has a second bent portion 26, the first bent portion 25 and the second bent portion 26 are arranged opposite to each other, so that a funnel-shaped space is formed at the top of the sheet-like screening mechanism 2, and the first bent portion 25 and the second bent portion 26 are arranged at intervals to form a screening The screening channel 28 is located at the lowest point of the funnel-shaped space, so that the flake particle samples smaller than the width of the screening channel 28 can pass through the screening channel 28 through vibration, thereby pre-separating the flake particle samples; one end of the plug 24 is connected to the first bending portion 25, and the other end is connected to the second bending portion 26. The first bending portion 25 and the second bending portion 26 are arranged at intervals to form the screening channel 28. The plug 24 is used to limit the width of the screening channel 28. The size of the plug 24 controls the width of the screening channel 28, which is suitable for the screening of flake particle samples of specified particle size samples; space is reserved at the bottom of the screening channel 28 to facilitate the falling of flake particle samples; the plug 24 is a sheet-like structural member.

[0040] In an optional embodiment, the bottom plate 21, the first bent plate 22 and the second bent plate 23 are one-piece structural parts formed by bending the entire plate, and one end of the plug spacer 24 is detachably connected to the first bent portion 25, and the other end is detachably connected to the second bent portion 26; in some embodiments, the flake screening mechanism 2 is a steel plate structural part, and the one-piece structural part of the steel structure has a certain ductility, and can change the width of the screening channel 28 by inserting plug spacers 24 of different specifications, so that the flake screening mechanism 2 can be used for pre-separation of flake particle samples of different particle sizes; the bottom plate 21, the first bent plate 22 and the second bent plate 23 are formed by bending a stainless steel plate with a thickness of 0.25 mm.

[0041] In an optional embodiment, plug spacers 24 are respectively provided at both ends of the screening channel 28 to ensure the structural strength of the screening channel 28 .

[0042] Specifically, the sheet screening mechanism 2 is composed of steel plates folded multiple times. The cross-section of the sheet screening mechanism 2 is an 8-shape with an opening at the top. A sheet plug spacer 24 with the same size as the six opening short sides of the sheet gauge is arranged at the waist of the sheet screening mechanism 2. The plug spacer 24 has six specifications. The plug spacer 24 is removed and replaced according to the particle size of the sample to control the width of the screening channel 28.

[0043] Example 2 like Figure 4As shown, a method for detecting needle-like flakes of coarse aggregates, using a device for detecting needle-like flakes of coarse aggregates in Example 1, comprises the following steps: S1: Primary screening of coarse aggregate: Screen the coarse aggregate according to the particle size to obtain samples of different particle sizes; S2: Pre-separation of needle-shaped particle samples: Pre-separation of needle-shaped particles is performed on samples of a specified particle size to obtain needle-shaped particle samples and remaining samples; S3: Needle-shaped particle sample verification: Use a needle-shaped gauge to test the needle-shaped particle sample particle by particle; S4: Pre-separation of flake particle samples: pre-separation of flake particles is performed on the remaining samples to obtain flake particle samples; S5: Verification of flake particle samples: Use a flake gauge to inspect the flake particle samples grain by grain.

[0044] The coarse aggregate is screened into different particle size samples as required by regulations according to the particle size through the primary screening. When the needle-like detection is performed on the designated particle size sample, the designated particle size sample is firstly pre-separated into the needle-like particle sample and the remaining sample. The particles that do not meet the needle-like particle characteristics are separated through the pre-separation operation, thereby reducing the detection amount of the sample by the needle-like gauge. Then, the needle-like particle sample is inspected particle by particle by the needle-like gauge to determine the specific number of needle-like particles and complete the needle-like particle detection. The remaining sample is pre-separated with the flake particle sample, and the flake particle sample that meets the flake particle characteristics is separated from the remaining sample. Then, the flake particle sample is inspected particle by particle by the flake gauge to determine the number of flake particles. The method for needle-like detection of coarse aggregate of the present invention adopts the pre-separation method to preliminarily select the needle-like particle sample and the flake particle sample, respectively, thereby reducing the number of particles detected by the needle-like gauge and the number of particles detected by the flake gauge, thereby improving the efficiency of needle-like detection of coarse aggregate and reducing the labor intensity of operators performing needle-like detection of coarse aggregate.

[0045] In one or several embodiments, in S3, the method of using a needle gauge to conduct particle-by-particle inspection on the needle-shaped particle sample is as follows: the maximum one-dimensional size of a single needle-shaped particle sample is compared with the comparison interval on the needle gauge; a comparison interval corresponding to the particle size sample is set on the needle gauge, and a single needle-shaped particle sample is taken and compared with the corresponding comparison interval to select needle-shaped particles whose maximum one-dimensional size exceeds the length of the comparison interval.

[0046] In one or several embodiments, in S5, the method of using a sheet gauge to conduct a grain-by-grain inspection of a flaky particle sample is as follows: comparing the minimum one-dimensional size of a single flaky particle sample with a comparison interval on the sheet gauge; a comparison interval corresponding to a particle size sample is provided on the sheet gauge, and a single flaky particle sample is taken and compared with the corresponding comparison interval to select flaky particles whose minimum one-dimensional size is smaller than the width of the comparison interval.

[0047] In one or several embodiments, in S1, a grading screen is used to screen the coarse aggregate into samples of six particle sizes; according to the detection regulations, when performing needle-like detection on the coarse aggregate, the coarse aggregate needs to be screened into samples of six particle sizes, and needle-like detection is performed on the samples of the six particle sizes respectively; corresponding to the six particle size samples, 6 needle-like screening mechanisms 1 of corresponding particle sizes are used to pre-separate the samples.

[0048] The specific implementation steps are as follows: 1. Screen the sample according to the specification and divide it into six samples of different particle sizes; 2. Pour the sieved samples of each particle size into the corresponding needle-shaped screening mechanism 1. The diameter of the square sieve hole 11 of the needle-shaped screening mechanism 1 is 20% higher than the lower limit of the needle-shaped particle diameter of the corresponding particle size, and the distance from the opening to the bottom of the box is 10% higher than the upper limit of the particle size. 3. Most of the samples will immediately pass through the square sieve hole 11. By continuously shaking the needle-shaped screening mechanism 1, some samples will be inserted between the square sieve hole 11 and the bottom surface 153 of the lower space but will not pass through the square sieve hole 11. The samples that do not pass through the square sieve hole 11 are the preliminarily selected needle-shaped particle samples, and the samples that pass through the square sieve hole 11 are the remaining samples. 4. Take out the preliminarily selected needle-shaped particle samples and inspect them one by one with a needle-shaped gauge. The particles with the largest one-dimensional size larger than the corresponding spacing on the needle-shaped gauge are needle-shaped particles; 5. Place the remaining sample into the sheet screening mechanism 2; 6. Shaking device: the particles passing through the screening channel of the flake screening mechanism 2 are the primary flake particle samples.

[0049] 7. Take out the flake particle samples and inspect them one by one with a flake gauge. The particles with the smallest one-dimensional dimension smaller than the corresponding hole width on the flake gauge are flake particles.

[0050] The specific test steps are as follows: ① Screen according to the specifications and divide the samples into different particle sizes; ② Take a sample of a certain particle size that has been screened, put it into the needle-shaped screening mechanism 1, and shake it continuously. Most of the samples pass through the square sieve holes 11, and the samples that roll out of the needle-shaped screening mechanism 1 are the remaining samples; ③ Collect the samples that pass through the square sieve holes 11 but are blocked by the bottom surface 153 of the lower space of the needle-shaped screening mechanism 1 as needle-shaped particle samples, until there are no samples in the needle-shaped screening mechanism 1; ④ Use a needle-shaped gauge to inspect the collected needle-shaped screening mechanism 1 particle by particle; ⑤ Select the plug spacer of the corresponding particle size, install it on the sheet screening mechanism 2, and tighten the locking nut 27; ⑥ Put the remaining sample rolled out of the needle-shaped screening box into the sheet screening mechanism 2, vibrate it repeatedly, so that the sheet-shaped particle sample passes through the screening channel, and inspect the sheet-shaped particle sample particle by particle with a sheet-shaped gauge. ⑦ Test the samples of other particle sizes according to the above ①-⑥.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting needle-like flakes in coarse aggregate, characterized in that: include S1: Primary screening of coarse aggregate: Screen the coarse aggregate according to the particle size to obtain samples of different particle sizes; S2: Pre-separation of needle-shaped particle samples: Pre-separation of needle-shaped particles is performed on samples of a specified particle size to obtain needle-shaped particle samples and remaining samples; S3: Needle-shaped particle sample verification: Use a needle-shaped gauge to test the needle-shaped particle sample particle by particle; S4: Pre-separation of flake particle samples: pre-separation of flake particles is performed on the remaining samples to obtain flake particle samples; S5: Verification of flake particle samples: Use a flake gauge to inspect the flake particle samples grain by grain.

2. The method for detecting needle-like flakes of coarse aggregate according to claim 1, characterized in that: In S3, the method of using the needle gauge to inspect the needle-shaped particle sample particle by particle is: comparing the maximum one-dimensional size of a single needle-shaped particle sample with the comparison interval on the needle gauge.

3. The method for detecting needle-like flakes of coarse aggregate according to claim 1, characterized in that: In S5, the method of using a sheet gauge to perform a grain-by-grain inspection on a flaky particle sample is as follows: comparing the minimum one-dimensional size of a single flaky particle sample with a comparison interval on the sheet gauge.

4. The method for detecting needle-like flakes of coarse aggregate according to claim 1, characterized in that: In S1, the coarse aggregate is screened into six particle size samples using a grading screen.

5. A device for detecting needle-like and flake-like coarse aggregates, characterized in that: The device for detecting needle-like and flake-like coarse aggregate is used for a method for detecting needle-like and flake-like coarse aggregate according to any one of claims 1 to 4, and the device for detecting needle-like and flake-like coarse aggregate comprises a needle-like screening mechanism (1) and a flake-like screening mechanism (2), wherein the needle-like screening mechanism (1) can pre-separate needle-like particle samples from the coarse aggregate by shaking, and the flake-like screening mechanism (2) can pre-separate flake-like particle samples from the coarse aggregate by vibrating.

6. The device for detecting needle-like and flake-like coarse aggregate according to claim 5, characterized in that: The needle-shaped screening mechanism (1) comprises a screening space (15), a feeding port (13) and a discharging port (14); a screening plate (12) is arranged in the screening space (15); the screening plate (12) divides the screening space (15) into an upper space (151) and a lower space (152); the feeding port (13) is connected to the upper space (151), and the discharging port (14) is connected to the lower space (152); a plurality of square screen holes (11) are formed on the screen plate (12); the upper space (151) and the lower space (152) are connected via the square screen holes (11); and the screen plate (12) is parallel to the bottom surface (153) of the lower space.

7. The device for detecting needle-like and flake-like coarse aggregate according to claim 6, characterized in that: The aperture of the square sieve hole (11) is 120% of the maximum permissible aperture of the specified particle size; and the distance between the square sieve hole (11) and the bottom surface (153) of the lower space is 110% of the maximum permissible aperture of the specified particle size.

8. The device for detecting needle-like and flake-like coarse aggregate according to claim 5, characterized in that: The sheet-like screening mechanism (2) comprises a plugging member (24), a bottom plate (21), a first bent plate (22) and a second bent plate (23); the first bent plate (22) and the second bent plate (23) are respectively connected to the bottom plate (21); the first bent plate (22) and the second bent plate (23) are arranged opposite to each other; the first bent plate (22) has a first bent portion (25); the second bent plate (23) has a second bent portion (26); the first bent portion (25) and the second bent portion (26) are arranged opposite to each other; one end of the plugging member (24) is connected to the first bent portion (25) and the other end is connected to the second bent portion (26); the first bent portion (25) and the second bent portion (26) are arranged at intervals to form a screening channel (28); the plugging member (24) is used to limit the width of the screening channel (28).

9. The device for detecting needle-like and flake-like coarse aggregate according to claim 8, characterized in that: The bottom plate (21), the first bent plate (22) and the second bent plate (23) are integrally formed structural members formed by bending the entire plate; one end of the spacer (24) is detachably connected to the first bent portion (25) and the other end is detachably connected to the second bent portion (26).

10. The device for detecting needle-like and flake-like coarse aggregate according to any one of claims 8 to 9, characterized in that: The plug spacers (24) are respectively provided at both ends of the screening channel (28).

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