Quality detection device for sand for concrete

Abstract

The utility model discloses a concrete sand quality detection device which is characterized in that overlarge sand is screened out through a sieve plate frame, water is fed into a water tank, a tray, a mounting block and a sieve drum are driven by a servo motor to do positive and negative rotation acceleration and deceleration motion to wash the sand, and a stirring plate can enable the water and the sand to be in full contact, so that the cleaning effect is improved. Sand smaller than screen holes of the screen drum is also screened out while cleaning wastewater is discharged, the influence of particle size difference and impurities on the void ratio detection result can be eliminated, the sand is dried through the heating plate, the screen drum continues to rotate, the drying efficiency is improved, a standard sample with the stable moisture content is obtained, the screen drum is put into a measuring vessel on the weighing assembly, and the weight of the sample is weighed. Water with the specified height is injected into the measuring vessel, the weight of the sample in the water is weighed, the void ratio is calculated according to the specific gravity principle, personal errors can be avoided through the detection device, the detection efficiency can be improved, the clean sample prepared through the device is uniform in particle size and stable in moisture content, and the accuracy of the detection result can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sand detection, in particular to a quality detection device for sand used in concrete. Background Art

[0002] Sand is the main fine aggregate of concrete, generally accounting for 20 - 40% of the volume fraction of concrete. It plays a role in filling voids and densifying the structure in concrete, and together with coarse aggregates (crushed stones or pebbles), it constitutes the skeleton of concrete to enhance the structural strength of concrete. Sand particles are polygonal and have uniform particle sizes, which can fill small pores and voids in concrete, helping to reduce the shrinkage and cracking of concrete, and making the concrete have better compactness and durability. The quality of sand used in concrete will directly affect the work performance and service life of the concrete finished product.

[0003] The void ratio of sand used in concrete refers to the proportion of the space occupied by pores in the sand body, which reflects the compactness of mutual filling between sand grains. Sand used in concrete with a small void ratio has a high particle compactness, which can reduce the pores and voids in concrete and enhance the compactness and impermeability of concrete. It is an important quality index of sand used in concrete. At present, for the void ratio detection of sand used in concrete, the tester prepares samples according to the specifications, places the samples in a container, weighs the total weight of the samples and the container, then injects water into the container until the samples are completely immersed and there are no bubbles attached, weighs the weight of the samples in water, and calculates the void ratio of the test samples according to the specific gravity principle. Due to certain errors in manual operation, repeated experiments are required to ensure the accuracy of the detection results. Moreover, the cleanliness and dryness of the samples will affect the detection results. Manual sample preparation and repeated experiments make the detection of the void ratio of sand used in concrete laborious and time-consuming, and it is still difficult to ensure the accuracy of the detection results. Therefore, there is an urgent need for a quality detection device for sand used in concrete that can complete sample preparation and void ratio detection to assist the tester in detection. Content of the Utility Model

[0004] The purpose of the utility model is to provide a quality detection device for sand used in concrete to assist the tester in completing sample preparation and the void ratio detection of sand used in concrete, and improve the detection efficiency and the accuracy of the detection results.

[0005] To solve the above technical problems, the utility model provides a quality detection device for sand used in concrete, which includes a water tank and a sieve cylinder. A servo motor is fixed at the bottom of the water tank, and the output end of the servo motor is connected to a tray. The tray is fixed with a mounting block at the connection between the tray and the servo motor. The middle part of the bottom side of the sieve cylinder is clamped and connected with the mounting block. A sieve plate frame is clamped on the top of the water tank. A plurality of stirring plates are arranged inside the sieve cylinder. A heating plate is fixed on the inner side wall of the water tank. One side of the top of the water tank is connected with a water inlet pipe, and a first control valve is installed at the connection between the water inlet pipe and the water tank. One side of the bottom of the water tank is connected with a drain pipe, and a second control valve is installed at the connection between the drain pipe and the water tank. A weighing assembly is arranged on one side of the water tank, a measuring dish is arranged on the upper side of the weighing assembly, a water injection pipe is connected to one side of the measuring dish, a third control valve is installed on the water injection pipe, and a water level scale line is arranged on the measuring dish.

[0006] As a preferred embodiment, a limiting assembly is fixed on the inner side wall of the top of the water tank, and the limiting assembly abuts against the outer wall of the top of the sieve cylinder.

[0007] Furthermore, it is worth noting that the limiting assembly includes a limiting frame fixed on the inner side wall of the water tank. Grooves are arranged on the four side faces of the limiting frame close to the sieve cylinder. A first elastic member is fixed in the groove, and a roller is fixed at the end of the elastic member far from the side wall of the water tank.

[0008] It should be noted in the solution that a limiting groove with a polygonal cross-section is arranged on the bottom side of the sieve cylinder; correspondingly, the mounting block is a polygonal block. A convex block is fixed on one side of the limiting groove close to the mounting block. A first clamping groove is arranged on one side of the mounting block close to the limiting groove, and second elastic members located inside the first clamping groove are fixed at both ends of the first clamping groove. A pressing plate is fixed at the end of each of the two second elastic members close to the convex block.

[0009] As a preferred embodiment, a vertical plate is fixed in the middle of the top side of the sieve cylinder, and a handle is installed on the vertical plate.

[0010] It should be noted in the solution that the sieve plate frame includes T-shaped frames clamped at both ends of the top side of the water tank. A sieve plate is fixed between the two T-shaped frames. The width of the sieve plate is equal to or less than the width of the sieve cylinder. A partition plate is arranged at the position of the sieve plate corresponding to the vertical plate.

[0011] Furthermore, it is worth noting that the stirring plates include a plurality of inclined plates and prisms evenly distributed on the two opposite inner side walls of the sieve cylinder, and the inclination directions of adjacent two inclined plates are different.

[0012] Further, it is worth noting that the weighing component includes a weighing platform located on one side of the water tank. A bracket is fixed on one side of the weighing platform, and a display panel is installed on the bracket. A fixing block that fits with the limiting groove is fixed at the center position of the inner bottom wall of the measuring dish. A second card slot is provided at the position corresponding to the convex block on the fixing block. Third elastic members are fixed at both ends of the second card slot inside the second card slot. Limiting plates are fixed at one ends of the two third elastic members close to the convex block.

[0013] Compared with the prior art, a sand quality detection device for concrete provided by the present utility model has at least the following beneficial effects:

[0014] By shaking the sieve plate frame clamped on the top of the water tank, sands that are too large can be screened out. Sands with a particle size smaller than the sieve holes are screened into the sieve cylinder. To ensure the cleanliness of the sand sample and avoid interference with the void ratio detection, a water inlet pipe is connected to one side of the top of the water tank. A first control valve is installed at the connection between the water inlet pipe and the water tank. Open the first control valve, and water is introduced into the water tank through the water inlet pipe, so that the water in the water tank submerges the sand in the sieve cylinder. Through the servo motor fixed at the bottom of the water tank, the tray connected to the output end of the servo motor is driven to perform forward and reverse acceleration and deceleration movements. An installation block is fixed on the tray at the connection between the tray and the servo motor. The middle part of the bottom side of the sieve cylinder is clamped and connected to the installation block. The installation block rotates together with the tray, and at the same time drives the sieve cylinder to rotate together. The water in the water tank continuously flushes the sand in the sieve cylinder, and the sand is cleaned during the continuous contact and friction with the sand. A plurality of stirring plates are arranged inside the sieve cylinder, and the stirring plates can make the water and the sand in the sieve cylinder fully contact, improving the cleaning effect.

[0015] According to the initial cleanliness of the sand, one-time cleaning or multiple repeated cleanings can be selected. After cleaning, a drain pipe is connected to one side of the bottom of the water tank, and a second control valve is installed at the connection between the drain pipe and the water tank. Open the second control valve, and discharge the cleaning wastewater through the drain pipe. At the same time, the sand smaller than the sieve holes of the sieve cylinder will also be screened out. At this time, the sand in the sieve cylinder is the clean sand that meets the required particle size range for testing, which can eliminate the influence of particle size differences and impurities on the void ratio test results. After draining all the cleaning wastewater, use the heating plate fixed on the inner side wall of the water tank to dry the sand in the sieve cylinder. During the drying process, the servo motor can be started to drive the sieve cylinder to rotate to ensure the uniformity of the drying of the sand in the sieve cylinder and improve the drying efficiency. After drying, the sand in the sieve cylinder is a qualified sample with uniform particle size, cleanliness and stable moisture content. Lift the sieve cylinder out of the water tank and place it in the measuring dish on the weighing component on one side of the water tank to weigh it. Remove the fixed weights of the measuring dish and the sieve cylinder to obtain the weight of the sample. Open the third control valve on the water injection pipe and inject water into the measuring dish through the water injection pipe until the sample in the sieve cylinder is completely immersed and there are no bubbles attached, and the water injection height should be a fixed value. After weighing, remove the fixed weights of the measuring dish and the sieve cylinder at the same water level to obtain the weight of the sample in water. Given the weight of the sample and the weight of the sample in water, the void ratio of the sand sample for concrete can be calculated according to the specific gravity principle. The measuring dish is provided with a water level scale line to facilitate controlling the water injection height. Through this detection device, the detection time can be shortened, human errors can be avoided, and there is no need for repeated experiments, improving the detection efficiency. The samples prepared by this device have uniform particle size, cleanliness and stable moisture content, improving the labor intensity of the inspectors and at the same time improving the accuracy of the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0017] Figure 1 Structural schematic diagram of a quality detection device for sand used in concrete provided by the present invention;

[0018] Figure 2 Internal top view structural schematic diagram of the water tank provided by the present invention;

[0019] Figure 3 Connection relationship schematic diagram of the sieve cylinder and the mounting block provided by the present invention;

[0020] Figure 4 Enlarged structural schematic diagram of part A provided by the present invention;

[0021] In the figure: 1. Water tank; 2. Sieve cylinder; 3. Servo motor; 4. Tray; 5. Mounting block; 6. Sieve plate frame; 600. T-shaped frame; 610. Sieve plate; 620. Partition plate; 7. Stirring plate; 700. Inclined plate; 710. Prism; 8. Heating plate; 9. Water inlet pipe; 10. First control valve; 11. Drain pipe; 12. Second control valve; 13. Weighing assembly; 130. Weighing platform; 131. Bracket; 132. Display panel; 14. Measuring dish; 15. Water injection pipe; 16. Third control valve; 17. Limiting assembly; 170. Limiting frame; 171. Groove; 172. First elastic member; 173. Roller; 18. Limiting groove; 19. Protrusion; 20. First clamping groove; 21. Second elastic member; 22. Baffle; 23. Vertical plate; 24. Handle; 25. Fixed block; 26. Second clamping groove; 27. Third elastic member; 28. Limiting plate; 29. Support table. Detailed implementation mode

[0022] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0023] The core of the present invention is to provide a device for detecting the quality of sand for concrete, so as to assist the inspector to complete the sample preparation and the detection of the void ratio of sand for concrete, and improve the detection efficiency and the accuracy of the detection results.

[0024] Figure 1 It is a schematic structural diagram of a device for detecting the quality of sand for concrete provided by the present invention. Figure 2 It is a schematic top view structure diagram of the inside of the water tank provided by the present invention. Figure 3 It is a schematic connection relationship diagram of the sieve cylinder and the mounting block provided by the present invention. Figure 4 It is a schematic enlarged structure diagram of part A provided by the present invention. Refer to Figures 1 to 4 as shown.

[0025] Embodiment 1

[0026] A device for detecting the quality of sand for concrete includes a water tank 1 and a sieve cylinder 2. Refer to Figure 1, a sieve plate rack 6 is clamped on the top of the water tank 1. Representative concrete sand randomly extracted from multiple positions is placed on the top side of the sieve plate rack 6. Hold the sieve plate rack 6 and shake it to sieve out the sand with too large particle size. The sand with a particle size smaller than the sieve holes is sieved into the inside of the sieve cylinder 2 and waits for subsequent cleaning. To ensure the cleanliness of the sand sample and avoid impurities interfering with the void ratio detection, a water inlet pipe 9 is connected to one side of the top of the water tank 1. A first control valve 10 is installed at the connection between the water inlet pipe 9 and the water tank 1. Open the first control valve 10, and water is introduced into the water tank 1 through the water inlet pipe 9 so that the clear water submerges the sand in the sieve cylinder 2. A servo motor 3 is fixed at the bottom of the water tank 1. The output end of the servo motor 3 is connected to a tray 4. The tray 4 is fixed with a mounting block 5 at the connection between the tray 4 and the servo motor 3. By starting the servo motor 3, the tray 4 and the mounting block 5 can be driven to perform forward and reverse acceleration and deceleration movements. It should be noted that a support platform 29 is provided between the tray 4 and the bottom of the water tank 1. The servo motor 3 is located inside the support platform 29, and the support platform 29 is rotatably connected to the tray. The support platform 29 can ensure the stability of the rotation of the tray 4 and protect the servo motor 3 at the same time. The middle part of the bottom side of the sieve cylinder 2 is clamped and connected to the mounting block 5, so as to facilitate taking out the sieve cylinder 2 after cleaning and drying for void ratio detection of the qualified sand sample. The sieve cylinder 2 clamped on the mounting block 5 will rotate together with the tray 4 and the mounting block 5. When the sieve cylinder 2 rotates forward and backward with acceleration and deceleration in the water tank 1, the sand in the sieve cylinder 2 continuously contacts and rubs against the water in the water tank 1, and the clear water washes away the impurities in the concrete sand, realizing the cleaning of the sand sample. A plurality of stirring plates 7 are arranged inside the sieve cylinder 2. The stirring plates 7 can make the sand in the sieve cylinder 2 fully contact with the clear water, ensuring that all the sand in the sieve cylinder 2 can be washed by the clear water and improving the cleaning effect of the sand sample.

[0027] A drain pipe 11 is connected to one side of the bottom of the water tank 1. A second control valve 12 is installed at the connection between the drain pipe 11 and the water tank 1. Open the second control valve 12, and the cleaning wastewater can be discharged from the water tank 1 through the drain pipe 11. If there are more impurities in the initial sand and the wastewater after the first cleaning is turbid, after the cleaning wastewater is drained, the first control valve 10 can be opened again to introduce water for secondary cleaning until the water after cleaning is no longer turbid. Multiple cleanings can be repeated during this period. It is worth noting that during the cleaning process, the sand with a particle size smaller than the sieve holes of the sieve cylinder 2 in the sieve cylinder 2 will also be sieved out. At this time, the sand remaining in the sieve cylinder 2 is the clean sand with a particle size within the required particle size range for detection, which helps to eliminate the influence of particle size differences on the void ratio detection result and avoid impurities interfering with the void ratio detection.

[0028] To avoid the influence of moisture on the density and volume of the sand sample for concrete, thereby interfering with the detection of void ratio, it is necessary to dry the sand that has been screened and cleaned inside the sieve cylinder 2. A heating plate 8 is fixed on the inner side wall of the water tank 1. After draining the cleaning wastewater in the water tank 1, the sand in the sieve cylinder 2 is dried through the heating plate 8. It should be noted that during the drying process, the servo motor 3 can be started to drive the sieve cylinder 2 to rotate, so that the sand in the sieve cylinder 2 can be evenly heated, ensuring the uniformity of drying. Preferably, an air inlet fan can also be installed between the inner side wall of the water tank 1 and the heating plate 8. The air flow sent by the air inlet fan passes through the heating plate 8 to absorb heat and becomes hot air, which is blown into the inside of the sieve cylinder 2 to conduct wet and heat exchange with the sand, which can further improve the drying efficiency. After the drying is completed, the clean sand in the sieve cylinder 2 is a qualified sample with uniform particle size and stable moisture content.

[0029] After obtaining a qualified sand sample and avoiding the influence of particle size distribution, impurities, and moisture on the void ratio detection result, a weighing assembly 13 is provided on one side of the water tank 1. A measuring dish 14 is provided on the upper side of the weighing assembly 13. The sieve cylinder 2 is lifted out of the water tank 1 and placed in the measuring dish 14 on the weighing assembly 13 for weighing. After subtracting the fixed weight of the measuring dish 14 and the empty sieve cylinder 2 from the measured weight, the weight of the qualified sand sample can be obtained. Preferably, a vertical plate 23 is fixed in the middle of the top side of the sieve cylinder 2, and a handle 24 is installed on the vertical plate 23. The handle 24 and the vertical plate 23 can facilitate the tester to steadily lift out and place the sieve cylinder 2. A water injection pipe 15 is connected to one side of the measuring dish 14, and a third control valve 16 is installed on the water injection pipe 15. Open the third control valve 16, and water is injected into the measuring dish 14 through the water injection pipe 15 until the qualified sand sample in the sieve cylinder 2 is completely immersed and there are no bubbles attached, ensuring that the water injection height in the measuring dish 14 is the specified height, and then weighing. After subtracting the sum of the weight of the measuring dish 14 and the weight of the empty sieve cylinder 2 at the same water injection height from the weighed weight, the weight of the qualified sand sample in water can be obtained. Then, according to the specific gravity principle, the void ratio of the sand sample for concrete can be calculated. It should be noted that the measuring dish 14 is provided with water level scale lines to facilitate the tester to control the water injection height. Using this detection device for sample preparation and void ratio detection can reduce the labor intensity of the tester, without repeating the experiment multiple times for the same detection sample, effectively shortening the detection time, while controlling and avoiding human errors, improving the detection efficiency and the accuracy of the detection results.

[0030] To further ensure the stability of the sieve cylinder 2 during the forward and reverse acceleration and deceleration rotation processes, refer to Figure 1 and Figure 2, on the inner side wall of the top of the water tank 1, a limiting component 17 is fixed. The limiting component 17 abuts against the outer wall of the top of the sieve cylinder 2. The limiting component 17 can limit the shaking of the sieve cylinder 2 in the left - right and front - back directions without affecting the rotation of the sieve cylinder 2, reduce the mechanical wear caused at the connection between the bottom of the sieve cylinder 2 and the mounting block 5, extend the service life of the device, and improve the rotation stability of the sieve cylinder 2. Specifically, the limiting component 17 includes a limiting frame 170 fixed on the inner side wall of the water tank 1. Grooves 171 are provided on the four side faces of the limiting frame 170 close to the sieve cylinder 2. A first elastic member 172 is fixed in the groove 171. One end of the first elastic member 172 far from the side wall of the water tank 1 is fixed with a roller 173. During the rotation of the sieve cylinder 2, its outer wall abuts against the roller 173, and the two rotate relative to each other. This not only does not affect the rotation of the sieve cylinder 2 itself, but also can limit the shaking and deviation of the sieve cylinder 2 through the force of the roller 173 against the sieve cylinder 2. The first elastic member 172 can buffer the frictional force between the roller 173 and the sieve cylinder 2, and extend the service life of the roller 173 and the sieve cylinder 2. Preferably, the sieve cylinder 2 is a double - layer sieve cylinder. The layer of the sieve cylinder close to the inner wall of the water tank 1 is a cylinder, which is convenient for the limiting component 17 to limit and ensure the stability of the sieve cylinder 2 during the normal rotation of the sieve cylinder 2. The layer of the sieve cylinder located inside is a prism, and its edges can increase the scouring force of the clear water on the sand in the sieve cylinder 2.

[0031] Embodiment 2

[0032] On the basis of Embodiment 1, a limiting groove 18 with a polygonal cross - section is provided on the bottom side of the sieve cylinder 2; correspondingly, the mounting block 5 is a polygonal block. When placing the sieve cylinder 2, the limiting groove 18 is stuck on the mounting block 5 that fits it, realizing the clamping between the two. When the sieve cylinder 2 rotates, since the corresponding vertical sides of the limiting groove 18 and the mounting block 5 are mutually clamped, the sieve cylinder 2 can rotate along with the mounting block 5. At the same time, after the cleaning and drying are completed, the sieve cylinder 2 can be taken out of the card by holding the handle 24. To further ensure the installation stability between the sieve cylinder 2 and the mounting block 5, a convex block 19 is fixed on one side of the limiting groove 18 close to the mounting block 5, and a first card slot 20 is provided on one side of the mounting block 5 close to the limiting groove 18. During the downward installation of the sieve cylinder 2, by the convex block 19 being inserted into the inside of the first card slot 20, the stability of the sieve cylinder 2 during rotation can be further ensured. Specifically, referring to Figure 3 , at both ends of the first card slot 20, second elastic members 21 located inside the first card slot 20 are fixed. One end of the two second elastic members 21 close to the convex block 19 is fixed with a pressing plate 22. When the convex block 19 enters the first card slot 20 downward, the two sides of the convex block 19 exert a driving force on the pressing plates 22, causing the second elastic members 21 to be compressed. The two pressing plates 22 move respectively to positions away from the convex block 19. Until the convex block 19 completely enters the first card slot 20, the second elastic members 21 and the pressing plates 22 form a clamping fixing force on the convex block 19, thereby enhancing the stability between the sieve cylinder 2 and the mounting block 5 on the premise of ensuring the easy removal of the sieve cylinder 2.

[0033] In some feasible implementation manners, the sieve plate frame 6 includes T-shaped frames 600 clamped at both ends of the top side of the water tank 1, and a sieve plate 610 is fixed between the two T-shaped frames 600. Refer to Figure 1 , the sieve plate 610 can be erected on the top side of the water tank 1 through the T-shaped frames 600, which is convenient for the inspector to hold and shake to screen the sand, and is also convenient for storage. After the screening is completed, the T-shaped frames 600 can be directly placed back at both ends of the top side of the water tank 1. It should be noted that the width of the sieve plate 610 is equal to or less than the width of the sieve cylinder 2 to prevent the screened sand from falling outside the sieve cylinder 2. The position of the sieve plate 610 corresponding to the vertical plate 23 is a partition plate 620. Through the partition plate 620, it can be avoided that the concrete sand falling from the sieve plate 610 falls on the vertical plate 23 of the sieve cylinder 2, resulting in the omission of this part of the sand from participating in the subsequent cleaning, screening and drying, and ensuring the accuracy of the test results.

[0034] Furthermore, the stirring plate 7 includes a plurality of inclined plates 700 and prisms 710 evenly distributed on two opposite inner side walls of the sieve cylinder 2. The inclination directions of adjacent two inclined plates 700 are different. Through the inclination angle of the inclined plates 700, it can ensure sufficient contact between water and sand in the vertical direction during the rotation process. Through the multiple inclined surfaces of the prisms 710, the water and sand can be mixed more evenly during the rotation process. On the one hand, it ensures uniform mixing between the sample sands to eliminate local differences, and on the other hand, it can improve the cleaning efficiency and cleaning effect of the sample sands.

[0035] In some feasible implementation manners, refer to Figure 1 , the weighing assembly 13 includes a weighing platform 130 located on one side of the water tank 1. The measuring dish 14 is arranged on the weighing platform 130. A bracket 131 is fixed on one side of the weighing platform 130, and a display panel 132 is installed on the bracket 131. The weighing data is directly displayed on the display panel 132, which is convenient for the inspector to record and can avoid the error caused by manual reading. Based on the installation manner between the sieve cylinder 2 and the mounting block 5, similarly, to ensure the stability of the sieve cylinder 2 placed in the measuring dish 14, a limiting structure consistent with the mounting block 5 is arranged in the measuring dish 14. Specifically, refer to Figure 1 and Figure 4 , a fixing block 25 that coincides with the limiting groove 18 is fixed at the central position of the inner bottom wall of the measuring dish 14. A second card slot 26 is arranged at the position corresponding to the convex block 19 on the fixing block 25. Third elastic members 27 located inside the second card slot 26 are fixed at both ends of the second card slot 26. Limiting plates 28 are fixed at one ends of the two third elastic members 27 close to the convex block 19. The above design principle has been described in detail above and will not be elaborated here.

[0036] The utility model can screen out excessive sand through the screen plate frame 6. Open the first control valve 10, and water is fed into the water tank 1 through the water inlet pipe 9, so that the water in the water tank 1 submerges the sand in the screen cylinder 2. The servo motor 3 drives the tray 4 and the mounting block 5 to perform positive and negative acceleration and deceleration movements, and the screen cylinder 2 clamped on the mounting block 5 rotates accordingly. The water in the water tank 1 continuously flushes the sand in the screen cylinder 2 to realize the cleaning of the sand. The stirring plate 7 can make the water fully contact with the sand in the screen cylinder 2, improving the cleaning effect. After the cleaning is completed, open the second control valve 12, and the cleaning wastewater is discharged through the drain pipe 11. At the same time, the sand smaller than the screen holes of the screen cylinder 2 will also be screened out. At this time, the sand in the screen cylinder 2 is the clean sand that meets the required particle size range for testing, which can eliminate the influence of particle size difference and impurities on the void ratio detection result. After draining all the cleaning wastewater, the sand in the screen cylinder 2 is dried by the heating plate 8. The continuous rotation of the screen cylinder 2 can ensure the uniformity of sand drying and improve the drying efficiency. After the drying is completed, the sand in the screen cylinder 2 is a qualified sample with uniform particle size, cleanliness and stable moisture content. The screen cylinder 2 is placed in the measuring dish 14 on the weighing assembly 13 for weighing. Removing the fixed weights of the measuring dish 14 and the screen cylinder 2 can obtain the sample weight. Open the third control valve 16, and water is injected into the measuring dish 14 through the water injection pipe 15 until the sample in the screen cylinder 2 is completely immersed and there are no bubbles attached. The water injection height should be a fixed value. After weighing, removing the fixed weights of the measuring dish 14 and the screen cylinder 2 at the same water level can obtain the weight of the sample in water. According to the specific gravity principle, the void ratio of the sand sample for concrete is calculated. The measuring dish 14 is provided with water level scale lines to facilitate the control of the water injection height. Through this detection device, the detection time can be shortened, human errors can be avoided, and there is no need for repeated experiments, improving the detection efficiency. The samples prepared by this device have uniform particle size, cleanliness and stable moisture content, improving the labor intensity of the inspectors and at the same time enhancing the accuracy of the detection results.

[0037] After considering the specification and the practice of the application disclosed herein, those skilled in the art will readily conceive of other embodiments of the present utility model. The present utility model aims to cover any variations, uses or adaptations of the present utility model, which follow the general principles of the present utility model and include the common general knowledge or conventional technical means in the technical field disclosed by the present utility model. The specification and the embodiments are only regarded as exemplary, and the true scope of the present utility model is pointed out by the claims.

[0038] It should be understood that the present utility model is not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The above-described embodiments of the present utility model do not constitute a limitation on the protection scope of the present utility model.

Claims

1. A concrete sand quality detection device, characterized in that: include: A water tank (1) and a sieve drum (2), wherein a servo motor (3) is fixed at the bottom of the water tank (1), an output end of the servo motor (3) is connected to a tray (4), a mounting block (5) located at the connection between the tray (4) and the servo motor (3) is fixed to the tray (4), the middle part of the bottom side of the sieve drum (2) is connected to the mounting block (5) by clamping, a sieve plate frame (6) is clamped at the top of the water tank (1), a plurality of stirring plates (7) are arranged inside the sieve drum (2), a heating plate (8) is fixed to the inner side wall of the water tank (1), and a water inlet pipe (9) is connected to one side of the top of the water tank (1). A first control valve (10) is installed at the connection between the water inlet pipe (9) and the water tank (1); a drainage pipe (11) is connected to one side of the bottom of the water tank (1); a second control valve (12) is installed at the connection between the drainage pipe (11) and the water tank (1); a weighing assembly (13) is provided on one side of the water tank (1); a measuring dish (14) is provided on the upper side of the weighing assembly (13); a water injection pipe (15) is connected to one side of the measuring dish (14); a third control valve (16) is installed on the water injection pipe (15); and a water level scale is provided on the measuring dish (14).

2. A concrete sand quality detection device according to claim 1, characterized in that: A limiting component (17) is fixed to the inner side wall of the top of the water tank (1), and the limiting component (17) is in conflict with the outer wall of the top of the sieve drum (2).

3. A concrete sand quality detection device according to claim 2, characterized in that: The limiting assembly (17) comprises a limiting frame (170) fixed to the inner wall of the water tank (1); the limiting frame (170) is provided with grooves (171) on four sides close to the screen drum (2); a first elastic member (172) is fixed in the groove (171); and a roller (173) is fixed to one end of the first elastic member (172) away from the side wall of the water tank (1).

4. A concrete sand quality detection device according to claim 1, characterized in that: The bottom side of the sieve drum (2) is provided with a limiting groove (18) with a polygonal cross section; Correspondingly, the mounting block (5) is a polygonal block, a protrusion (19) is fixed on one side of the limiting groove (18) close to the mounting block (5), a first clamping groove (20) is provided on one side of the mounting block (5) close to the limiting groove (18), second elastic members (21) located inside the first clamping groove (20) are fixed at both ends of the first clamping groove (20), and abutment plates (22) are fixed on one end of the two second elastic members (21) close to the protrusion (19).

5. A concrete sand quality detection device according to claim 1, characterized in that: A vertical plate (23) is fixed to the middle of the top side of the screen cylinder (2), and a handle (24) is installed on the vertical plate (23).

6. A concrete sand quality detection device according to claim 5, characterized in that: The sieve plate frame (6) comprises a T-shaped frame (600) clamped at both ends of the top side of the water tank (1), a sieve plate (610) is fixed between the two T-shaped frames (600), the width of the sieve plate (610) is equal to or less than the width of the sieve cylinder (2), and the position of the sieve plate (610) corresponding to the vertical plate (23) is a partition plate (620).

7. A concrete sand quality detection device according to claim 1, characterized in that: The stirring plate (7) comprises a plurality of inclined plates (700) and prisms (710) uniformly distributed on two opposite inner side walls of the screen cylinder (2), and the inclined directions of two adjacent inclined plates (700) are different.

8. A concrete sand quality detection device according to claim 4, characterized in that: The weighing assembly (13) comprises a weighing platform (130) located at one side of the water tank (1), a bracket (131) being fixed to one side of the weighing platform (130), a display panel (132) being mounted on the bracket (131), a fixing block (25) matching the limiting groove (18) being fixed at the center position of the inner bottom wall of the measuring dish (14), a second slot (26) being arranged at a position corresponding to the protrusion (19) of the fixing block (25), third elastic members (27) located inside the second slot (26) being fixed at both ends of the second slot (26), and limiting plates (28) being fixed to one end of each of the two third elastic members (27) close to the protrusion (19).

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