CN-121988522-A - Screening device and screening detection method for detecting fineness modulus of sand

CN121988522ACN 121988522 ACN121988522 ACN 121988522ACN-121988522-A

Abstract

The invention belongs to the technical field of constructional engineering, and particularly relates to a screening device and a screening detection method for detecting fineness modulus of sand. According to the invention, the sealing assembly of the sealing part is matched with the fixing assembly, the top and the bottom of each screening ring are respectively provided with an elastic sealing ring, the upper and lower compression rings and the connecting rods are vertically compressed, tight sealing between adjacent screening layers is realized, sand grains can be effectively prevented from being scattered from gaps in the screening process, the whole device is comprehensively protected through the protection barrel body of the protection part and the sealing cover assembly, external sundries can be prevented from entering and being damaged by collision, a stable frame structure is formed by combining the fixing assemblies, loosening and shifting of the screening layers in the screening process can be effectively prevented, meanwhile, the spring assembly can buffer vibration impact force, damage to the vibration symmetrical weight sensor and other components is reduced, and a preset sand fineness modulus algorithm is adopted, so that sand sample fineness modulus can be accurately and efficiently obtained.

Inventors

TIAN JIAN
LONG YONGSHUANG
Dong Caohui
WANG KANG
ZHANG XULONG
OUYANG JIAN
CHEN FEI
LIU YANG
SHU XIN

Assignees

湖北省建筑科学研究设计院股份有限公司
湖北省建筑工程质量监督检验测试中心有限公司

Dates

Publication Date: 20260508
Application Date: 20260228

Claims (10)

1. The screening device for detecting the fineness modulus of sand is characterized by comprising a screening part (1), a sealing part (2) and a protecting part (3), wherein the screening part (1) comprises a plurality of screening rings (101) which are coaxially arranged along the vertical direction, the screening rings (101) are of annular hollow structures, the inner walls of the screening rings are respectively provided with a screen (102) in a sliding manner along the vertical direction, the aperture of each screen (102) is sequentially reduced along the vertical direction from top to bottom according to the fineness modulus detection requirement of the sand of a sample to be detected according to a preset proportion, and a weighing sensor (104) is arranged right below the middle part of each screen (102), and each weighing sensor (104) is in wireless communication connection with an external data acquisition terminal; The sealing part (2) consists of a sealing assembly (21) and a fixing assembly (22), the sealing assembly (21) comprises two sealing cover plates (212) symmetrically arranged at the top and the bottom of the screening part (1), and elastic sealing rings (213) respectively arranged at the top and the bottom of each screening ring (101), and the fixing assembly (22) is used for vertically pressing each screening ring (101) and the corresponding elastic sealing ring (213); The fixing assembly (22) comprises an upper pressing ring (221) and a lower pressing ring (223) which are respectively pressed at the top and the bottom of the screening part (1), a plurality of connecting rods (222) are uniformly connected between the upper pressing ring (221) and the lower pressing ring (223) along the circumferential direction, and a plurality of groups of connecting rod semicircular slots (225) for inserting the connecting rods (222) are formed in the outer wall of the screening part (1); the protection part (3) comprises a protection barrel assembly (31) coated outside the screening part (1) and the sealing part (2), and a sealing cover assembly (32) is arranged at the top of the protection barrel assembly (31).
2. The screening device for detecting the fineness modulus of sand according to claim 1, wherein a plurality of vertical sliding grooves (105) are uniformly formed in the inner wall of the screening ring (101) along the circumference, the screen (102) is installed in the corresponding vertical sliding groove (105) through a plurality of sliding blocks (106) fixedly connected with the outer ring of the screen in a sliding clamping manner, and the screen can slide up and down along the vertical sliding groove (105) within a preset range relative to the screening ring (101); The weighing sensors (104) are arranged on corresponding sensor brackets (103), the measuring ends of the weighing sensors (104) are in contact with the middle part of the lower surface of the screen (102), and the sensor brackets (103) are fixedly connected to the inner walls of the corresponding screening rings (101).
3. The screening device for detecting the fineness modulus of sand according to claim 1 is characterized in that thread grooves (211) are formed in the top of the uppermost screening ring (101) and the bottom of the lowermost screening ring (101) of the screening part (1), internal threads (216) matched with the thread grooves (211) are formed in the inner wall of the sealing cover plate (212), and the two sealing cover plates (212) are matched with the thread grooves (211) through the internal threads (216) and are respectively arranged at the top and the bottom of the screening part (1).
4. The screening device for detecting the fineness modulus of sand according to claim 1, wherein boss-type grooves for installing the elastic sealing rings (213) are formed in the top and bottom of the screening ring (101), a supporting ring (214) is arranged on the surface of the elastic sealing rings (213) facing the screen (102), and an elastic ring (215) is arranged on the surface of the elastic sealing rings (213) far away from the screen (102).
5. The screening device for detecting sand fineness modulus according to claim 1, wherein the top end of the connecting rod (222) is fixedly connected with the upper pressure ring (221) through a connecting bolt (224), and the bottom end of the connecting rod (222) is fixedly connected with the upper surface of the lower pressure ring (223) into a whole through welding.
6. The screening device for detecting sand fineness modulus according to claim 5, wherein the protective barrel assembly (31) comprises a protective barrel body (311) coated outside the screening part (1) and the sealing part (2), a supporting block (312) is arranged at the inner bottom of the protective barrel body (311), a spring (313) is embedded in the middle of the supporting block (312), and a cushion block (314) is arranged between the supporting block (312) and the lower pressure ring (223).
7. The screening device for detecting the fineness modulus of sand according to claim 6, wherein one end of the spring (313) is embedded and installed in a middle hole formed in the middle of the supporting block (312), the other end of the spring abuts against the middle of the lower surface of the cushion block (314), a plurality of guide posts are uniformly connected to the lower surface of the cushion block (314) along the circumferential direction, and a plurality of guide holes matched with the guide posts are formed in the supporting block (312).
8. The screening device for detecting sand fineness modulus according to claim 6, wherein the cover assembly (32) comprises a cover body (321) in threaded connection with the top of the protection barrel body (311), a rotating block (322) is rotatably arranged in the cover body (321), and a plurality of accommodating holes matched with the top ends of the connecting bolts (224) are formed in the lower surface of the rotating block (322).
9. A screening detection method of fineness modulus of sand, adopting the screening device according to any one of claims 1 to 8, comprising the steps of: s1, device calibration and assembly: The weighing sensors (104) are fixedly arranged on the corresponding sensor brackets (103), and a data acquisition terminal is started to perform zero calibration on each weighing sensor (104); N screening rings (101) are vertically and coaxially overlapped according to a preset screen aperture sequence, and meanwhile elastic sealing rings (213) are embedded and installed in boss grooves at the top and the bottom of each screening ring (101) and an upper sealing cover plate (212) and a lower sealing cover plate are installed; The upper compression ring (221) and the lower compression ring (223) are matched with the connecting rod (222) to vertically compress each screening ring (101) and the corresponding elastic sealing ring (213), so that the elastic sealing ring (213) is extruded and deformed, and sealing between adjacent screening layers is realized; the assembled screening part (1) and sealing part (2) are placed in a protective barrel body (311), a cover body (321) is screwed on the top of the protective barrel body (311) through threaded fit, and meanwhile, a containing hole on the lower surface of a rotating block (322) is sleeved on the top end of a connecting bolt (224), so that firm connection and tight sealing of all the parts are ensured; s2, sand sample pretreatment: weighing sand samples with preset weight, putting the sand samples into an oven, drying the sand samples to constant weight at a preset temperature, then putting the sand samples into a dryer for cooling to room temperature, and removing caking and sundries in the sand samples by using tweezers to ensure uniform dispersion of the sand samples; S3, sand sample throwing and screening operation: Unscrewing a cover body (321) at the top of the protection barrel body (311), opening a sealing cover plate (212) at the top of the sieving part (1), and uniformly throwing pretreated sand samples into a sieving ring (101) at the uppermost part of the sieving part (1); after the throwing is finished, the sealing cover plate (212) at the top of the sieving part (1) and the cover body (321) at the top of the protecting barrel body (311) are re-screwed, so that the sealing tightness of the device is ensured; Placing the whole device on vibration screening equipment, adjusting the vibration frequency and the vibration time of the vibration screening equipment to preset values, starting the vibration screening equipment, and driving the device to integrally vibrate so as to execute grading screening of sand samples; S4, screen residue weight collection and sand fineness modulus calculation: After the sand sample is classified and screened, the weight data measured by each weighing sensor (104) is read through an external data acquisition terminal, the data is the weight of the screen residues on the corresponding screen (102), and is recorded as m i , wherein i is the sequence number of a screening ring, m 1 is the weight of the screen residues of the screen cloth at the top, m n is the weight of the screen residues of the screen cloth at the bottom, and the sand fineness modulus of the sand sample to be detected is calculated and determined by adopting a preset sand fineness modulus algorithm based on the weight of the screen residues of each screen cloth, and the thickness degree of the sand sample is judged.
10. The sand fineness modulus screening detection method according to claim 9, wherein the sand fineness modulus algorithm includes: 1) The cumulative percent screen and the fractional percent screen for each screen are calculated separately: The fractional screen surplus percentage a i =(m i /m Total (S) ) is multiplied by 100 percent, wherein m Total (S) is the total weight of the put sand sample; The cumulative percent screen remaining a i =a 1 +a 2 +…+a i , wherein i=1, 2..n; 2) The fineness modulus Mx of the sand sample is calculated according to the accumulated screen residue percentage of each screen, and the calculation formula is as follows: Mx=(A 2 +A 3 +…+A n -n×A 1 )/(100-A 1 ) Wherein A 1 is the cumulative percentage of screen residue of the uppermost screen, and A n is the cumulative percentage of screen residue of the lowermost screen; 3) Judging the thickness degree of the sand sample according to the fineness modulus Mx of the sand sample: when Mx is more than 3.7, the coarse sand is judged, when Mx is more than 3.0 and less than or equal to 3.7, the medium coarse sand is judged, when Mx is more than 2.3 and less than or equal to 3.0, the medium coarse sand is judged, when Mx is more than 1.6 and less than or equal to 2.3, the fine sand is judged, and when Mx is less than or equal to 1.6, the extra fine sand is judged.

Description

Screening device and screening detection method for detecting fineness modulus of sand Technical Field The invention belongs to the technical field of constructional engineering, and particularly relates to a screening device and a screening detection method for detecting fineness modulus of sand. Background In the field of constructional engineering, the sand fineness modulus is a core index for measuring the thickness degree of sand particles, directly influences the fluidity, strength and durability of building materials such as concrete, mortar and the like, and is a key detection item for controlling the quality of sand and stone in the constructional engineering. At present, the sand fineness modulus screening detection device and method commonly used in the construction engineering still have a plurality of defects, and the high-efficiency and accurate detection requirements are difficult to meet. Meanwhile, the fixed structure of the existing device is unstable, vibration generated in the screening process easily causes loosening and deviation of the screen layers, not only affects the sealing effect, but also possibly damages weighing components, and reduces the service life and detection stability of the device. In addition, in the existing detection method, each screen layer is required to be manually disassembled after screening is finished, the weight of the screen residues is weighed one by one, the operation is tedious, the time consumption is long, the loss or mixing of the screen residues is easy to cause in the manual disassembly process, the detection error is further increased, meanwhile, the effective protection of the device is lacking, external impurities are easy to enter the screen layer in the screening process, or the device is damaged by collision, and the smooth performance of detection work is affected. Disclosure of Invention The invention aims to solve the technical problems of providing a screening device and a screening detection method for detecting the fineness modulus of sand, which have good sealing performance, stable structure and convenient operation, can realize real-time collection of the weight of the screen residues, and can greatly improve the accuracy and efficiency of the fineness modulus detection of sand. In order to solve the technical problems, the invention adopts the following technical scheme: 1. Screening device for detecting fineness modulus of sand The invention provides a screening device for detecting fineness modulus of sand, which mainly comprises a screening part 1, a sealing part 2 and a protecting part 3; The screening part 1 comprises a plurality of screening rings 101 which are coaxially arranged along the vertical direction, the screening rings 101 are of annular hollow structures, the inner walls of the screening rings are provided with screens 102 in a sliding mode along the vertical direction, the aperture of each screen 102 is sequentially reduced along the vertical direction from top to bottom according to the sand fineness modulus detection requirement of a sample to be detected, weighing sensors 104 are arranged right below the middle part of each screen 102, and the weighing sensors 104 are in wireless communication connection with an external data acquisition terminal; The sealing part 2 consists of a sealing assembly 21 and a fixing assembly 22, wherein the sealing assembly 21 comprises two sealing cover plates 212 symmetrically arranged at the top and the bottom of the sieving part 1, and elastic sealing rings 213 respectively arranged at the top and the bottom of each sieving ring 101, and the fixing assembly 22 is used for vertically pressing each sieving ring 101 and the corresponding elastic sealing ring 213; The fixing assembly 22 comprises an upper pressing ring 221 and a lower pressing ring 223 respectively pressed at the top and the bottom of the sieving portion 1, a plurality of connecting rods 222 are uniformly connected between the upper pressing ring 221 and the lower pressing ring 223 along the circumferential direction, and a plurality of groups of connecting rod semicircular slots 225 for inserting the connecting rods 222 are formed in the outer wall of the sieving portion 1; The protecting part 3 comprises a protecting barrel assembly 31 coated outside the sieving part 1 and the sealing part 2, and a sealing cover assembly 32 is arranged on the top of the protecting barrel assembly 31. Preferably, a plurality of vertical sliding grooves 105 are uniformly formed in the inner wall of the screening ring 101 along the circumference, the screen 102 is slidably and clamped in the corresponding vertical sliding grooves 105 through a plurality of sliding blocks 106 fixedly connected with the outer periphery of the screen 102, and can slide up and down along the vertical sliding grooves 105 within a preset range relative to the screening ring 101; the weighing sensors 104 are all installed on the corresponding sensor brack