A screening device for cement sampling
By designing an automated cement sampling and screening device, which uses spring deformation to measure the amount of cement and combines it with mechanical transmission to achieve automatic screening, the problems of low efficiency and poor accuracy of manual sampling are solved, and an efficient and accurate cement sampling process is realized.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN INST OF PROD QUALITY SUPERVISION INSPECTION & TESTING (SICHUAN QUALITY & TECH REVIEW & EVALUATION CENT)
- Filing Date
- 2025-09-17
- Publication Date
- 2026-08-04
AI Technical Summary
In the existing cement sampling and testing process, manual sampling is inefficient, makes it difficult to accurately control the sampling amount, leads to waste of manpower and materials, and the screening does not meet the standards.
A cement sampling sieving device was designed. The total mass of the cement sample is measured by the elastic deformation of the spring. Automatic sieving is achieved by combining a drive motor, gears and crank transmission. The device stops automatically after the preset sampling amount is set, ensuring sieving accuracy and efficiency.
It has achieved automation and precision in cement sampling, reduced manpower consumption, improved screening efficiency, ensured the accuracy of sampling and compliance with testing standards, and reduced material waste.
Smart Images
Figure CN224586353U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the technical field of cement testing equipment, specifically a cement sampling screening device. Background Technology
[0002] According to the existing cement sampling and testing process, if manual sampling is used, a square-hole sieve with a aperture of 0.9 mm is required to sieve the cement powder to obtain the standard for testing.
[0003] Manual sampling is not only slow and labor-intensive, but also requires sampling in batches because the sampling sieves are generally shallow. Sampling operators have difficulty controlling the amount of cement sampled and can only try to take as much as possible, resulting in a waste of sampling manpower and materials.
[0004] Therefore, it is necessary to propose a cement sampling sieving device that can use machinery to sample and measure the quality of cement, and can automatically stop sieving cement after reaching the preset sampling amount. Utility Model Content
[0005] To address the aforementioned problems, the purpose of this invention is to provide a cement sampling sieving device that measures the total mass of the cement sample and calculates the sampling mass by utilizing the elastic deformation of a spring. This allows for automatic termination of sampling based on a preset sampling quantity, replacing manual sieving with mechanical shaking, thereby improving the efficiency and accuracy of sampling.
[0006] To achieve the above objectives, the technical solution of this utility model is as follows: a cement sampling screening device includes a support platform, an inclined chute is opened on the support platform, a screening component is slidably fitted in the chute, and a tension component is fixedly connected to one end of the chute, and the tension component is fixedly connected to the screening component. The screening component is used for automatically screening cement samples; The tension component is used to measure the cement sample residue in the screening component through elastic deformation, and stops sampling after the preset screening sampling amount is reached.
[0007] Furthermore, the screening assembly includes a sliding member with several pulleys symmetrically rotatably connected on both sides. The pulleys are all in sliding engagement with the sliding groove. A screening port is vertically opened inside the sliding member, and a screening cylinder is sleeved inside the screening port. A screening screen is fixedly connected to the bottom end of the screening cylinder. A drive ring is fixedly sleeved in the middle of the screening cylinder. Several cranks are rotatably connected to the drive ring. A drive gear is coaxially fixedly connected to the top of each crank. The drive gear is rotatably connected to the inner wall of the screening port. A stabilizing ring groove is also opened on the inner wall of the screening port. The stabilizing ring groove is in sliding engagement with the drive ring. A transmission ring is slidably engaged on the upper part of the sliding member. The transmission ring has toothed grooves on both its inner and outer sides. The drive gears mesh with the toothed grooves on the inner side of the transmission ring.
[0008] Furthermore, the screening assembly also includes a drive motor, which is fixedly connected to the side wall of the sliding member. A drive gear is coaxially fixedly connected to the output shaft of the drive motor, and the drive gear meshes with the outer tooth groove of the transmission ring.
[0009] Furthermore, the screening mesh is hemispherical, with several sieve holes, each with a diameter of 0.9 mm.
[0010] Furthermore, a funnel-shaped opening is fixedly connected to the top of the screening cylinder to prevent cement from entering the screening port.
[0011] Furthermore, the tension assembly includes a measuring platform, which is fixedly connected to the top of the slide. A tension groove is opened inside the measuring platform, and symmetrical balance pins are rotatably connected inside the tension groove. The balance pins mesh with each other, and springs are fixedly connected to the ends of the balance pins that are far apart from each other. A first slide rail and a second slide rail, which are parallel to each other, are fixedly connected to the top and bottom walls of the tension groove, respectively. A tension slider is slidably fitted on the first slide rail. Both ends of the tension slider are fixedly connected to corresponding springs, and a pull rope is fixedly connected to the middle of the tension slider. A tension hole is opened on the side wall of the measuring platform near the slide. A pulley is also fixedly connected to the side wall of the measuring platform. The pulley corresponds to the tension hole. The pull rope passes through the tension hole and engages with the pulley. The other end of the pull rope is fixedly connected to the slider.
[0012] Furthermore, a sampling slider is slidably fitted on the second slide rail, and a threaded rod is rotatably connected to the sampling slider. The threaded rod is parallel to the spring and faces the side wall of the tension groove. The side wall of the tension groove has a calibration threaded hole and a sampling threaded hole. The threaded rod passes through the sampling threaded hole and is threadedly engaged with the sampling threaded hole. An adjusting wheel is fixedly connected to the end of the threaded rod away from the sampling slider. A calibration bolt is threadedly engaged in the calibration threaded hole, and the calibration bolt engages with the balance pin.
[0013] Furthermore, a measuring scale is fixedly connected to the tension slider and closely attached to the top wall of the tension groove. A sampling scale is fixedly connected to the sampling slider. The top wall of the measuring platform has observation slots corresponding to the measuring scale and the sampling scale. Each observation slot is covered with a protective cover, which is made of transparent material and has an indicator arrow engraved on it.
[0014] Furthermore, a drive switch is fixedly connected to the side of the tension slider near the sampling slider. The drive switch is used to shut off the drive motor when the tension slider and the sampling slider come into contact and press together.
[0015] The basic principle of this cement sampling screening device revolves around two core functions: "automatic screening of cement samples" and "measuring residual amount through elastic deformation and automatically stopping at the preset sampling amount." The overall function is achieved through the coordinated action of the support platform, screening components, and tension components. The support platform has an inclined chute, within which the screening components slide. The tension component is fixed to one end of the chute and connected to the screening components; the two are linked through a mechanical structure to form a complete working logic. During the screening process, after the drive motor in the screening components starts, the active gear on its output shaft drives the meshing transmission ring. The inner tooth groove of the transmission ring meshes with several drive gears, transmitting the circumferential motion to a crank fixed coaxially with the drive gears. The other end of the crank is rotatably connected to the drive ring in the middle of the screening cylinder. The drive ring is embedded in a stabilizing ring groove on the inner wall of the screening opening to limit radial offset. The rotation of the crank pushes the drive ring to reciprocate up and down or swing along the stabilizing ring groove, causing the screening cylinder to move synchronously. The bottom of the screening cylinder is fixed with a hemispherical screening screen with a screen hole diameter of 0.9mm, conforming to the standard GBT12573-2008. The cement sample shakes during the movement of the screening cylinder. Cement that meets the particle size requirements falls through the screen holes, while cement that does not meet the requirements remains in the screening cylinder. At the same time, the flared mouth at the top of the screening cylinder can prevent cement from spilling into the screening port, ensuring that the residue is concentrated only in the screening cylinder. The pulleys on both sides of the sliding component slide in conjunction with the inclined slide groove to ensure the overall position of the screening component is stable during the screening process, avoiding the impact of vibration and displacement on the screening effect. In the weighing and automatic stop process, due to the inclined chute, the cement remaining in the screening cylinder tends to slide downwards along the chute. This tendency is transmitted to the tension slider in the tension assembly via a pull rope. One end of the pull rope is connected to the sliding component of the screening assembly, and the other end passes through the tension hole of the weighing platform, goes around the pulley, and is fixed to the tension slider. The tension slider slides on the first slide rail, and its two ends are also fixed to springs. The other end of the springs is connected to symmetrical and meshing balance pins. When the tension slider is pulled and moves, it causes one side of the spring to stretch and the other side of the spring to compress. The balance pins mesh and rotate due to the difference in spring forces. The amount of cement remaining in the screening cylinder can be indirectly reflected by the elastic deformation of the springs. Meanwhile, the sampling slider, which slides on the second slide rail, can be adjusted in position via a threaded rod. The threaded rod engages with the sampling threaded hole, and rotating the adjusting wheel moves the sampling slider to set the preset sampling amount. The observation slot on the top wall of the measuring platform (equipped with a transparent protective cover and indicator arrows) allows real-time observation of the correspondence between the residual amount and the preset amount via the measuring scale and sampling scale. The calibration bolt can also correct the measuring accuracy by adjusting the initial position of the balance pin, avoiding deviations caused by spring aging or installation errors. When the residual amount in the screening cylinder reaches the preset value, the tension slider will be pulled to press against the sampling slider. At this time, the drive switch on the tension slider is triggered, the drive motor is turned off, and the screening component stops working, thus realizing the function of "automatic stop upon reaching the preset sampling amount".
[0016] The beneficial effects are: 1. Traditional manual sampling requires repeated shaking of the sieve by hand, and because the sieve is shallow, it needs to be operated in batches, which is inefficient; this device achieves fully automatic sieving through drive motor, gear and crank transmission, without manual intervention, and can operate continuously, which greatly shortens the sampling time and reduces manpower input.
[0017] 2. Manual sampling makes it difficult to control the amount of cement sampled, resulting in the need to take as much as possible and wasting materials. This device can accurately control the amount of residue in the screening cylinder by measuring the elastic deformation of the tension component and adjusting the preset sampling amount. It will automatically stop when the preset value is reached, eliminating the need for extra sampling, reducing cement material waste, and avoiding the additional manpower consumption caused by secondary processing after taking too much sample.
[0018] The sieve aperture diameter strictly follows the 0.9mm standard of GBT12573-2008, and the flared mouth prevents cement from contaminating the sieve opening, ensuring that the final cement sample meets the testing standards and avoiding repeated sampling due to unqualified samples.
[0019] 3. The pulleys, inclined chutes, drive rings, and stabilizing ring grooves of the screening assembly ensure that there is no radial offset when the screening cylinder moves, and the screening process is stable; the first / second slide rails of the tension assembly restrict the movement direction of the slider to avoid positional deviation during measurement.
[0020] The symmetrical engagement of the balance pins reduces the error of unilateral spring deformation, the calibration bolts can correct the initial accuracy, and the transparent scale facilitates real-time monitoring, ensuring that the sampling error is controllable.
[0021] 4. By rotating the threaded rod to adjust the position of the sampling slider, different preset sampling amounts can be flexibly set. Without replacing the core components, it can adapt to the sampling needs of different batches and different testing items in cement testing, thus improving the versatility of the device. Attached Figure Description
[0022] Figure 1 This is an isometric view of the cement sampling sieve device of this utility model.
[0023] Figure 2 This is a side view of the cement sampling screening device of this utility model.
[0024] Figure 3 This is a top view of the cement sampling screening device of this utility model.
[0025] Figure 4 for Figure 2 Sectional view of AA.
[0026] Figure 5 for Figure 3 A cross-sectional view of BB.
[0027] Figure 6 for Figure 5 Enlarged view of the Z-section.
[0028] Reference numerals: 1. Measuring platform; 2. Support platform; 3. Sliding component; 4. Drive motor; 5. Transmission ring; 6. Bell mouth; 7. Pull rope; 8. Observation slot; 9. Measuring scale; 10. Threaded rod; 11. Adjusting wheel; 12. Calibration bolt; 13. Pulley; 14. First slide rail; 15. Pull slider; 16. Drive switch; 17. Sampling slider; 18. Balance pin; 19. Spring; 20. Sampling scale; 21. Screening screen; 22. Drive gear; 23. Screening cylinder; 24. Drive ring; 25. Drive gear; 26. Crank. Detailed Implementation
[0029] The following detailed description illustrates the specific implementation method: Example 1 like Figure 1 , Figure 3 , Figure 5 and Figure 6 As shown: A cement sampling screening device includes a support platform 2, an inclined chute on the support platform 2, a screening component slidingly fitted in the chute, a tension component welded to one end of the chute, and the tension component being bonded to the screening component.
[0030] The screening assembly is used for automatic screening of cement samples. The screening assembly includes a sliding member 3, on which several pulleys 13 are symmetrically rotatably connected on both sides. The pulleys 13 are all slidably engaged with the sliding groove. A screening port is vertically opened inside the sliding member 3. A screening cylinder 23 is sleeved inside the screening port. A screening screen 21 is welded to the bottom end of the screening cylinder 23. A drive ring 24 is fixedly sleeved in the middle of the screening cylinder 23. Several cranks 26 are rotatably connected to the drive ring 24. A drive gear 25 is coaxially welded to the top of each crank 26. The drive gear 25 is rotatably connected to the inner wall of the screening port. A stabilizing ring groove is also opened in the inner wall of the screening port. The stabilizing ring groove is slidably engaged with the drive ring 24. A transmission ring 5 is slidably engaged on the upper part of the sliding member 3. The transmission ring 5 has toothed grooves on both its inner and outer sides. The drive gear 25 meshes with the toothed grooves on the inner side of the transmission ring 5.
[0031] The screening assembly also includes a drive motor 4, which is welded to the side wall of the slide 3. A drive gear 22 is coaxially welded on the output shaft of the drive motor 4. The drive gear 22 meshes with the outer tooth groove of the transmission ring 5. The drive motor 4 is preferably the 0IK1A-AW3U from Dongfang Motor.
[0032] The screening mesh 21 is hemispherical and has several screen holes with a diameter of 0.9 mm. The top of the screening cylinder 23 is welded with a bell mouth 6 to block cement from entering the screening port.
[0033] The tension component is used to measure the cement sample residue in the screening component through elastic deformation, and stops sampling after the preset screening sampling amount is reached.
[0034] The specific implementation process is as follows: During automatic screening, after adding cement powder to the screening cylinder 23, the drive motor 4 of the screening device is started. After the motor starts working, its output shaft drives the coaxially fixed drive gear 22 to rotate synchronously. Since the drive gear 22 meshes with the outer tooth groove of the transmission ring 5 that is slidably sleeved on the upper part of the slide 3, the rotational force of the drive gear 22 is transmitted to the transmission ring 5, causing the transmission ring 5 to make a stable circular motion around the axis of the slide 3. At the same time, the inner tooth groove of the transmission ring 5 meshes with several drive gears 25 that are evenly distributed on the inner wall of the screening opening. The circular motion of the transmission ring 5 is further converted into the rotational motion of each drive gear 25. Each drive gear 25 is coaxially fixed with a crank 26, so the crank 26 rotates synchronously with the drive gear 25. The other end of the crank 26 is rotatably connected to the drive ring 24 fixedly sleeved in the middle of the screening cylinder 23, and the drive ring 24 is fitted into the stabilizing ring groove opened in the inner wall of the screening port. The stabilizing ring groove strictly restricts the radial displacement of the drive ring 24, allowing it to only make reciprocating oscillating motion along the ring groove. Therefore, the rotational motion of the crank 26 is finally converted into the reciprocating motion of the entire screening cylinder 23 driven by the drive ring 24. This motion simulates the action of manual shaking of the screen, but it is more stable and more uniform in frequency than manual operation, greatly improving the screening efficiency.
[0035] Combination Figure 3 and Figure 6 As shown, during the reciprocating motion of the screening cylinder 23, the hemispherical screening mesh 21 fixed at its bottom begins to perform the screening function: compared with the traditional flat screen, the hemispherical structure not only increases the contact area between the cement sample and the screen, but also uses the arc surface to guide the cement sample to shake evenly in the screen, reducing the problem of screen hole blockage caused by cement accumulation in a local area; the diameter of the screen holes opened on the screening mesh 21 is strictly controlled to 0.9mm, which fully complies with the requirements for the sieve hole diameter of cement sampling in the standard GBT12573-2008. Therefore, cement powder that meets the requirements of the detection particle size will fall naturally through the screen holes (a collection device can be set under the support platform 2 to receive qualified powder), while cement particles that exceed the size limit will remain in the screening cylinder 23 and continue to be retained until the screening is completed. During this process, several pulleys 13 symmetrically rotated and connected on both sides of the sliding member 3 always maintain sliding engagement with the inclined groove of the support platform 2. The rolling friction of the pulleys 13 greatly reduces the frictional resistance between the sliding member 3 and the groove, avoiding wear of the components due to long-term sliding. At the same time, the symmetrically distributed pulleys 13 can ensure that the sliding member 3 is subjected to uniform force during the screening process, preventing it from shifting or tilting due to the vibration of the screening cylinder 23, and ensuring that the entire screening assembly always maintains a stable posture along the inclined direction of the groove, providing a stable foundation for the force transmission of the subsequent tension assembly.
[0036] Example 2 The difference from the above embodiments is that, as Figure 2 and Figure 4 As shown: The tension assembly includes a measuring platform 1, which is welded to the top of the slide. A tension groove is opened inside the measuring platform 1, and symmetrical balance pins 18 are rotatably connected inside the tension groove. The balance pins 18 mesh with each other, and springs 19 are welded to the ends of the balance pins 18 that are far apart from each other. A first slide rail 14 and a second slide rail that are parallel to each other are welded to the top and bottom walls of the tension groove, respectively. A tension slider 15 is slidably fitted on the first slide rail 14. The two ends of the tension slider 15 are welded to the corresponding springs 19, and a pull rope 7 is glued to the middle of the tension slider 15. A tension hole is opened on the side wall of the measuring platform 1 near the slide. A pulley 13 is also welded to the side wall of the measuring platform 1. The pulley 13 corresponds to the tension hole. The pull rope 7 passes through the tension hole and engages with the pulley 13. The other end of the pull rope 7 is glued to the slider 3.
[0037] A sampling slider 17 is slidably fitted on the second slide rail. A threaded rod 10 is rotatably connected to the sampling slider 17. The threaded rod 10 is parallel to the spring 19 and faces the side wall of the tension groove. The side wall of the tension groove has a calibration threaded hole and a sampling threaded hole. The threaded rod 10 passes through the sampling threaded hole and is threadedly fitted to the sampling threaded hole. An adjusting wheel 11 is welded to the end of the threaded rod 10 away from the sampling slider 17. A calibration bolt 12 is threadedly fitted in the calibration threaded hole. The calibration bolt 12 is fitted to the balance pin 18.
[0038] The tension slider 15 is welded with a measuring scale 9 that is close to the top wall of the tension groove. The sampling slider 17 is welded with a sampling scale 20. The top wall of the measuring table 1 has an observation groove 8 corresponding to the measuring scale 9 and the sampling scale 20. Each observation groove 8 is covered with a protective cover. The protective covers are all made of transparent material and each protective cover is engraved with an indicator arrow.
[0039] A drive switch 16 is attached to the side of the tension slider 15 near the sampling slider 17. The drive switch 16 is used to turn off the drive motor 4 when the tension slider 15 and the sampling slider 17 are in contact and pressed together.
[0040] The specific implementation process is as follows: When using this cement sampling and screening device for cement sampling and screening, preliminary preparations must first be completed to ensure the accuracy and stability of subsequent operations. First, the preset sampling amount is calibrated and set for the tension component: By rotating the adjusting wheel 11 on the sampling slider 17 in the tension component, the threaded rod 10, which is coaxially fixed with the adjusting wheel 11, is driven to rotate. Since the threaded rod 10 is threadedly engaged with the sampling threaded hole on the side wall of the tension groove, the rotation of the threaded rod 10 is converted into the linear movement of the sampling slider 17 along the second slide rail until it passes through the sampling scale 20 under the transparent protective cover on the top wall of the measuring platform 1. It is observed that the sampling slider 17 has moved to the scale position corresponding to the preset sampling amount. Then, the initial angle of the balance pin 18 can be finely adjusted by rotating the calibration bolt 12 to correct the measurement error that may be caused by the aging of the spring 19 or installation deviation, and to ensure the accuracy of the subsequent residual amount measurement. After the preset is completed, the cement sample to be screened is added into the screening cylinder 23 of the screening component. At this time, the funnel 6 fixed at the top of the screening cylinder 23 plays a key role: its open structure facilitates quick feeding and completely blocks the gap between the screening cylinder 23 and the screening port, preventing cement from falling into the screening port during feeding or subsequent screening, ensuring that all cement to be screened is concentrated in the screening cylinder 23, eliminating interference for accurate measurement of the residual amount in the later stage.
[0041] Combination Figure 4 As shown, as screening continues, the total mass of cement particles remaining in the screening cylinder 23 decreases continuously. Because the chute of the support platform 2 is inclined, the cement in the screening cylinder 23 tends to slide downwards along the chute due to gravity. This tendency causes the sliding member 3, fixed to the screening cylinder 23, to generate a downward pulling force. The sliding member 3 is fixedly connected to the pulling slider 15 in the pulling assembly via a pull rope 7. One end of the pull rope 7 is connected to the sliding member 3, and the other end passes through the pulling hole in the side wall of the measuring platform 1 and around the corresponding pulley 13 (the pulley 13 changes the direction of the force on the pull rope 7, reducing friction between the pull rope 7 and the hole wall), and is finally fixed to the pulling slider 15 on the first slide rail 14. Therefore, the downward pulling force of the sliding member 3 is transmitted to the pulling slider 15 through the pull rope 7, causing the pulling slider 15 to slide along the first slide rail 14 towards the sampling slider 17. When the tension slider 15 slides, the springs 19 connected to its two ends deform accordingly. The symmetrical balance pin 18 connected to the other end of the spring 19 meshes and rotates due to the difference in force between the two springs 19. The meshing relationship of the balance pin 18 can balance some of the force fluctuations, so that the deformation of the spring 19 can more accurately reflect the mass of the residual cement in the screening cylinder 23 (the larger the deformation, the greater the residual mass). At this time, the operator can observe the position of the tension slider 15 through the measuring scale 9 under the transparent protective cover and keep track of the changes in the residual amount in real time.
[0042] When the mass of residual cement in the screening cylinder 23 reaches the preset sampling amount, the tension slider 15 slides along the first slide rail 14 until it is fully in contact with the pre-adjusted sampling slider 17. At this time, the drive switch 16 fixed on the side of the tension slider 15 near the sampling slider 17 is triggered, the internal contacts of the switch close, the power supply to the drive motor 4 is cut off, the motor stops working, and the linkage of the drive gear 22, transmission ring 5, drive gear 25 and crank 26 is terminated. The screening cylinder 23 stops reciprocating, and the entire screening process ends automatically. At this time, the cement remaining in the screening cylinder 23 is the excess material; while the powder falling through the sieve holes can be collected or processed as needed.
[0043] In summary, throughout the entire implementation process, the horn-shaped opening 6 ensures cement concentration, the screening mesh 21 guarantees sample compliance, the pulley 13 and chute ensure structural stability, the drive motor 4 and transmission components enable automatic screening, and the tension component accurately measures and triggers automatic stop through elastic deformation. Ultimately, this achieves automated operation and precise quantity control in cement sampling and screening, completely solving the problems of low efficiency, high manpower consumption, and difficulty in controlling sample volume in traditional manual sampling. At the same time, it significantly reduces material waste and provides efficient and reliable equipment support for cement testing.
[0044] Detailed sampling experiment process: Sieving sampling performance test report I. Experimental Objective The main evaluation criteria are: screening efficiency: the processing capacity per unit time compared to traditional manual screening; sampling accuracy: the error between the actual sample mass and the preset target mass after the device automatically stops; automation and consistency: the stability and degree of automation of the sampling results during repeated operation.
[0045] II. Experimental Basis GB / T 12573-2008 Cement Sampling Method This utility model specification III. Experimental Equipment and Materials Experimental group: One device of this utility model.
[0046] Control group: standard 0.9mm square hole sieve, balance (accuracy 0.1g), stopwatch, brush and other traditional manual sampling tools.
[0047] Experimental materials: P·O 42.5 grade cement produced in the same batch, with a total amount of not less than 50 kg.
[0048] Auxiliary tool: Electronic balance (accuracy 0.01g), used for final sample weighing.
[0049] IV. Experimental Procedure Preparation: Mix the cement sample thoroughly to ensure its homogeneity.
[0050] Calibrate the device of this utility model: Under no-load conditions, adjust the "calibration bolt 12" and "adjustment wheel 11" of the tension component so that the pointers of the "measuring scale 9" and "sampling scale 20" are both zero.
[0051] Set the preset sampling amount to 500.0g (by moving the "sampling slider 17" to the corresponding scale position of the "sampling scale 20" and locking it).
[0052] Experimental group test (of this utility model device): Steps: a. Take about 600g of cement (make sure it is slightly more than the preset value) and pour it into the screening cylinder 23 through the "Flute Mouth 6".
[0053] b. Start the device, drive motor 4 to start working, and drive screening cylinder 23 to perform screening.
[0054] c. Observe the tensioning assembly. As qualified cement particles are collected through the screen, the total mass of the screening assembly decreases, spring 19 rebounds, and pulls the "tension slider 15" to move.
[0055] d. When the "tension slider 15" comes into contact with the "sampling slider 17", the drive motor 4 automatically shuts off, and the screening stops.
[0056] e. Collect cement samples that have passed through a sieve, weigh them using a precision electronic balance, and record the mass as the actual sample mass.
[0057] f. Record the total time from start to automatic stop, which is the sampling time for a single screening.
[0058] g. Repeat the above process 5 times, clean the screen and reset the device, and then proceed to the next round of testing.
[0059] Control group test (traditional manual sieving): Steps: a. Weigh about 600g of cement and pour it into a 0.9mm square mesh sieve.
[0060] b. One person holds a sieve and performs manual sieving at a frequency of approximately 120 times per minute, simulating the amplitude and frequency of mechanical sieving. Simultaneously, another person starts a stopwatch to time the process.
[0061] c. Pause every 30 seconds, clean the sieve edge with a brush and weigh the sieved cement until the sieved amount reaches 500g±0.5g, then stop timing immediately.
[0062] d. Record the time taken for the final sieving and the actual sample quality obtained.
[0063] e. Repeat the above process 5 times by the same operator.
[0064] V. Experimental Results As shown in the table below: Table 1. Experimental data comparing sampling accuracy and efficiency
[0065] VI. Experimental Conclusions 1. The average absolute error of this device is only 0.1g, and the average relative error is 0.02%, which is far lower than that of manual sieving (0.8g and 0.16%). Its automatic weighing system based on mechanical principles effectively eliminates human judgment errors, achieves ultra-high precision quantitative sampling, and greatly reduces sample waste.
[0066] 2. This utility model device completes a sampling in an average of only 57.8 seconds, while the traditional manual method takes an average of 125 seconds, improving efficiency by approximately 116%. Automated mechanical screening replaces inefficient manual labor, significantly shortening the test preparation time.
[0067] 3. The experimental group's time consumption and error data showed extremely low dispersion across the five trials, demonstrating the stability and reliability of the device. Throughout the process, the operator only needed to pour in the sample and turn on the switch; the rest of the process was completed automatically by the device, avoiding fluctuations in results caused by fatigue and skill differences during manual operation, and truly achieving standardized and unmanned sampling operations.
Claims
1. A cement sampling sieving device, comprising a support platform (2), characterized in that, An inclined chute is provided on the support platform (2), and a screening component is slidably fitted inside the chute. A tension component is fixedly connected to one end of the chute, and the tension component is fixedly connected to the screening component. The screening component is used for automatically screening cement samples; The tension component is used to measure the cement sample residue in the screening component through elastic deformation, and stops sampling after the preset screening sampling amount is reached.
2. The cement sampling sieving device according to claim 1, characterized in that, The screening assembly includes a sliding member (3), with several pulleys (13) symmetrically rotatably connected on both sides of the sliding member (3). The pulleys (13) are all in sliding fit with the sliding groove. A screening port is vertically opened inside the sliding member (3). A screening cylinder (23) is sleeved inside the screening port. A screening screen (21) is fixedly connected to the bottom end of the screening cylinder (23). A drive ring (24) is fixedly sleeved in the middle of the screening cylinder (23). Several cranks (26) are rotatably connected to the drive ring (24). A drive gear (25) is coaxially fixedly connected to the top of each crank (26). The drive gear (25) is rotatably connected to the inner wall of the screening port. A stabilizing ring groove is also opened on the inner wall of the screening port. The stabilizing ring groove is in sliding fit with the drive ring (24). A transmission ring (5) is slidably fitted on the upper part of the sliding member (3). The transmission ring (5) has tooth grooves on both the inner and outer sides. The drive gear (25) meshes with the tooth grooves on the inner side of the transmission ring (5).
3. The cement sampling sieving device according to claim 2, characterized in that, The screening assembly also includes a drive motor (4), which is fixedly connected to the side wall of the slide (3). A drive gear (22) is coaxially fixedly connected to the output shaft of the drive motor (4), and the drive gear (22) meshes with the outer tooth groove of the transmission ring (5).
4. The sieving device for cement sampling according to claim 2, characterized in that, The sieve (21) is hemispherical and has several sieve holes with a diameter of 0.9 mm.
5. The cement sampling sieving device according to claim 2, characterized in that, The top of the screening cylinder (23) is fixedly connected to a bell mouth (6) for shielding and preventing cement from entering the screening port.
6. The sieving device for cement sampling according to claim 1, characterized in that, The tension assembly includes a measuring platform (1), which is fixedly connected to the top of the slide. The measuring platform (1) has a tension groove inside, and symmetrical balance pins (18) are rotatably connected inside the tension groove. The balance pins (18) mesh with each other, and springs (19) are fixedly connected to the ends of the balance pins (18) that are far apart from each other. The top and bottom walls of the tension groove are respectively fixedly connected to a first slide rail (14) and a second slide rail that are parallel to each other. A tension slider (15) is slidably fitted on the first slide rail (14). The two ends of the tension slider (15) are fixedly connected to the corresponding springs (19). A pull rope (7) is fixedly connected to the middle of the tension slider (15). A tension hole is opened on the side wall of the measuring platform (1) near the slide. A pulley (13) is also fixedly connected to the side wall of the measuring platform (1). The pulley (13) corresponds to the tension hole. The pull rope (7) passes through the tension hole and cooperates with the pulley (13). The other end of the pull rope (7) is fixedly connected to the slider (3).
7. The sieving device for cement sampling according to claim 6, characterized in that, A sampling slider (17) is slidably fitted on the second slide rail. A threaded rod (10) is rotatably connected to the sampling slider (17). The threaded rod (10) is parallel to the spring (19) and faces the side wall of the tension groove. The side wall of the tension groove has a calibration threaded hole and a sampling threaded hole. The threaded rod (10) passes through the sampling threaded hole and is threadedly fitted to the sampling threaded hole. An adjusting wheel (11) is fixedly connected to the end of the threaded rod (10) away from the sampling slider (17). A calibration bolt (12) is threadedly fitted in the calibration threaded hole. The calibration bolt (12) is fitted with the balance pin (18).
8. The sieving device for cement sampling according to claim 7, characterized in that, The tension slider (15) is fixedly connected to a measuring scale (9) that is close to the top wall of the tension groove. The sampling slider (17) is fixedly connected to a sampling scale (20). The top wall of the measuring platform (1) has an observation groove (8) corresponding to the measuring scale (9) and the sampling scale (20). The observation groove (8) is covered with a protective cover. The protective cover is made of transparent material and has an indicator arrow engraved on it.
9. The sieving device for cement sampling according to claim 8, characterized in that, A drive switch (16) is fixedly connected to the side of the tension slider (15) near the sampling slider (17). The drive switch (16) is used to turn off the drive motor (4) when the tension slider (15) and the sampling slider (17) are in contact and pressed together.