Cement fineness negative pressure screen analysis instrument

Abstract

The utility model relates to a cement fineness negative pressure screen analysis instrument, which belongs to the technical field of cement fineness negative pressure screen analysis instruments and comprises a screen analysis instrument body, a feed inlet is arranged on the upper surface of the screen analysis instrument body, and three layers of screens are arranged in an inner cavity of the screen analysis instrument body. An anti-blocking mechanism used for preventing the screen from being blocked is arranged between the opposite sides of the left side wall and the right side wall of an inner cavity of the screen analysis instrument body, and an efficiency improving mechanism used for improving the screening efficiency is arranged in the center of the lower surface of the screen. And the anti-blocking mechanism comprises three screw rods, a fixed box, a motor, a driving bevel gear, a driven bevel gear, three screw sleeves and three cleaning brushes. The cement fineness negative pressure screen analysis instrument can adapt to cement particles with different particle sizes by adopting a multi-layer screen design, further can provide more accurate particle size distribution data, remarkably improves the accuracy of cement fineness analysis, effectively prevents the screen from being blocked by regularly cleaning the surface of the screen, and improves the accuracy of cement fineness analysis. Therefore, the screening efficiency and the measurement precision are greatly improved.

Description

Technical Field

[0001] This utility model relates to the technical field of cement fineness negative pressure sieve analyzer, specifically a cement fineness negative pressure sieve analyzer. Background Technology

[0002] The cement fineness negative pressure sieve analyzer is used to test the fineness of silicate cement, ordinary silicate cement, slag silicate cement, fly ash silicate cement, and composite silicate cement. Its main components include a sieve base, a micro motor, and a dust collector. It uses negative pressure sieving to test the fineness of cement particles, ensuring that the quality of the cement meets the standard requirements.

[0003] A search revealed Chinese Patent Publication No. CN216224892U, which discloses a cement fineness negative pressure sieve analyzer, relating to the technical field of recycled concrete. This improves upon the previous method, which involved using a vacuum cleaner to expel gas, which typically contains small amounts of particulate matter that can cause air pollution. The analyzer body has an installation port on its upper surface, with a test sieve installed on the inner wall of the port. The analyzer body also has a funnel-shaped opening inside. During use, cement particles are placed into the test sieve, and the vacuum cleaner is activated to transfer particles smaller than the mesh size into a cyclone separator through a first connecting pipe. The gas in the cyclone separator is filtered through a filter screen and enters a second connecting pipe. An exhaust pipe, in conjunction with a ventilation frame, discharges the gas into a water-filled container. Ventilation holes on the ventilation plate break down the emitted air bubbles into smaller bubbles, thereby reducing particulate matter in the discharged gas and minimizing air pollution.

[0004] However, the equipment used in the above-mentioned utility model is a traditional negative pressure sieve analyzer. This type of instrument uses negative pressure adsorption to make cement samples pass through the sieve, thereby achieving fine sieving. However, in actual operation, this type of instrument may encounter technical problems such as sieve blockage or sample residue, resulting in low sieving efficiency and further affecting the accuracy of measurement, making it impossible to effectively guarantee the measurement results. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a cement fineness negative pressure sieve analyzer, which has the advantages of high sieving efficiency and solves the technical problems of possible sieve clogging or sample residue, which lead to low sieving efficiency and further affect the accuracy of measurement, making it impossible to effectively guarantee the measurement results.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cement fineness negative pressure sieve analyzer, including a sieve analyzer body, an inlet on the upper surface of the sieve analyzer body, three layers of screens in the inner cavity of the sieve analyzer body, an anti-clogging mechanism for preventing screen blockage between the opposite sides of the left and right side walls of the inner cavity of the sieve analyzer body, and an efficiency-enhancing mechanism for improving screening efficiency at the center of the lower surface of the screen.

[0007] The anti-clogging mechanism includes three screws, a fixed box, a motor, a driving bevel gear, a driven bevel gear, three screw sleeves, and three cleaning brushes. The right side of each screw is rotatably connected to the right side wall of the inner cavity of the sieve analyzer body via a bearing. The fixed box is fixed to the top left side of the sieve analyzer body. The left side of each screw penetrates the left side wall of the inner cavity of the sieve analyzer body and extends into the inner cavity of the fixed box, where it is rotatably connected to the left side wall of the inner cavity of the fixed box via a bearing. The motor is fixed to the right end of the top wall inside the fixed box. The driving bevel gear is fixed to the bottom of the outer surface of the motor output shaft. The driven bevel gear is fixed to the right end of the outer surface of the top screw. The driving bevel gear and the driven bevel gear are meshed together. The screw sleeves are threadedly connected to the screws. The cleaning brushes are fixed to the lower surface of the screw sleeves.

[0008] By adopting this technical solution, the screen surface is cleaned regularly, which effectively prevents screen clogging and thus greatly improves screening efficiency and measurement accuracy.

[0009] Furthermore, fans are fixed to the front sides of both ends of the bottom wall of the screening instrument body, and vacuum pumps are fixed to the rear sides of both ends of the bottom wall of the screening instrument body. The input ends of the fans and vacuum pumps are connected to inclined air hoods. A filter screen is fixed to the upper surface of the air hoods. The output ends of the fans and vacuum pumps penetrate the screening instrument body and extend to the outside of the screening instrument body.

[0010] By adopting this technical solution, the negative pressure intensity during the screening process can be monitored and stably controlled in real time through the equipped negative pressure sensor and control system, ensuring the stability of the screening environment and further improving the accuracy of screening and the repeatability of experimental results.

[0011] Furthermore, the inner bottom wall of the screening instrument body is provided with a discharge port, and the left and right ends of the lower surface of the screening instrument body are fixed with support seats. The upper surface of the two support seats is provided with the same collection box, and the inner cavity of the collection box is larger than the size of the discharge port.

[0012] By adopting this technical solution, a collection box is installed to collect cement particles falling from the screen.

[0013] Furthermore, the three screws are evenly distributed in the inner cavity of the sieve analyzer body, and the top screw and the middle screw, as well as the bottom screw and the middle screw, are all connected by belt drive.

[0014] By adopting this technical solution, the top screw can drive the rotation of the middle and bottom screws through belt transmission, so that the screw sleeve can drive the sweeping brush to move.

[0015] Furthermore, an L-shaped plate is fixed to the back of the screw sleeve, and three sliding grooves are provided on the inner wall of the sieve body. The L-shaped plate moves horizontally in the inner cavity of the sliding groove.

[0016] This technical solution can be used to limit the movement of the threaded sleeve, allowing it to move only in a straight line.

[0017] Furthermore, the screen includes a mounting frame and screen plates at both ends, and the mesh count of the three screens increases sequentially from top to bottom.

[0018] By adopting this technical solution and employing a multi-layer sieve design, it can accommodate cement particles of different sizes, thereby providing more accurate particle size distribution data and significantly improving the accuracy of cement fineness analysis.

[0019] Furthermore, the efficiency-enhancing mechanism includes a protective box, a vibrator, two connecting plates, and two elastic elements. The protective box is fixed to the lower surface of the screen mounting frame, the vibrator is fixed to the inner cavity of the protective box, the output shaft of the vibrator passes through the protective box and extends to the upper side of the protective box and is fixed to the screen, the two connecting plates are fixed to the opposite side of the left and right side walls of the inner cavity of the screen analyzer, and the elastic elements are fixed between the opposite side of the screen and the connecting plates.

[0020] By adopting this technical solution, a vibrator is introduced to provide vibration force to promote screening, resulting in higher screening efficiency.

[0021] Furthermore, the elastic element includes a telescopic rod and a spring, with the spring movably sleeved on the outer surface of the telescopic rod.

[0022] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0023] 1. This cement fineness negative pressure sieve analyzer, through its multi-layer sieve design, can adapt to cement particles of different sizes, thereby providing more accurate particle size distribution data and significantly improving the accuracy of cement fineness analysis. By regularly cleaning the sieve surface, clogging of the sieve is effectively prevented, thus greatly improving screening efficiency and measurement accuracy.

[0024] 2. This cement fineness negative pressure sieve analyzer, equipped with a negative pressure sensor and control system, can monitor and stably control the negative pressure intensity during the sieving process in real time, ensuring the stability of the sieving environment, further improving the accuracy of sieving and the repeatability of experimental results. By introducing a vibrator to provide vibration force to promote sieving, the sieving efficiency is high. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the screen structure of this utility model;

[0027] Figure 3 This is a schematic diagram of the anti-blocking mechanism of this utility model;

[0028] Figure 4 This is a schematic diagram of the efficiency-enhancing mechanism of this utility model.

[0029] In the diagram: 1. Screening instrument body; 2. Feed inlet; 3. Screen; 4. Anti-clogging mechanism; 41. Screw; 42. Fixed box; 43. Motor; 44. Driving bevel gear; 45. Driven bevel gear; 46. Screw sleeve; 47. Cleaning brush; 5. Efficiency improvement mechanism; 51. Protective box; 52. Vibrator; 53. Connecting plate; 54. Elastic component. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figures 1 to 2 The cement fineness negative pressure sieve analyzer in this embodiment includes a sieve analyzer body 1, a feed inlet 2 on the upper surface of the sieve analyzer body 1, a three-layer screen 3 in the inner cavity of the sieve analyzer body 1, an anti-blocking mechanism 4 for preventing the screen 3 from being blocked between the opposite sides of the left and right side walls of the inner cavity of the sieve analyzer body 1, and an efficiency-enhancing mechanism 5 for improving screening efficiency at the center of the lower surface of the screen 3.

[0032] In this embodiment, fans are fixed to the front sides of both ends of the bottom wall of the sieve body 1, and vacuum pumps are fixed to the rear sides of both ends of the bottom wall of the sieve body 1. The input ends of the fans and vacuum pumps are connected to inclined air hoods. A filter screen is fixed to the upper surface of the air hoods. The output ends of the fans and vacuum pumps pass through the sieve body 1 and extend to the outside of the sieve body 1.

[0033] It should be noted that a negative pressure sensor is installed on the left side wall of the inner cavity of the sieve analyzer body 1. In conjunction with the control system, it can monitor and stably control the negative pressure intensity during the sieving process in real time, ensuring the stability of the sieving environment and further improving the accuracy of sieving and the repeatability of experimental results.

[0034] The sieve analyzer body 1 has a discharge port on its inner bottom wall. Support seats are fixed at both ends of the lower surface of the sieve analyzer body 1. The same collection box is placed on the upper surface of the two support seats. The size of the inner cavity of the collection box is larger than the size of the discharge port. The screen 3 includes a mounting frame and screen plates at both ends. The mesh size of the three screens 3 increases sequentially from top to bottom. By adopting the design of multi-layer screens 3, it can adapt to cement particles of different sizes, thereby providing more accurate particle size distribution data and significantly improving the accuracy of cement fineness analysis.

[0035] Please see Figure 3 To prevent clogging of the screen 3, the anti-clogging mechanism 4 in this embodiment includes three screws 41, a fixed box 42, a motor 43, a driving bevel gear 44, a driven bevel gear 45, three screw sleeves 46, and three cleaning brushes 47. The right side of the screw 41 is rotatably connected to the right side wall of the inner cavity of the screen body 1 via a bearing. The fixed box 42 is fixed to the top left side of the screen body 1. The left side of the screw 41 penetrates the left side wall of the inner cavity of the screen body 1 and extends to the inner cavity of the fixed box 42, and is rotatably connected to the left side wall of the inner cavity of the fixed box 42 via a bearing. The motor 43 is fixed to the right end of the inner top wall of the fixed box 42. The driving bevel gear 44 is fixed to the bottom of the outer surface of the output shaft of the motor 43. The driven bevel gear 45 is fixed to the bottom of the inner top wall of the fixed box 42. The driving bevel gear 44 and the driven bevel gear 45 are meshed and connected at the right end of the outer surface of the top screw 41. When the motor 43 is started, the output shaft of the motor 43 rotates, which drives the driving bevel gear 44 to rotate. The rotation of the driving bevel gear 44 causes the driven bevel gear 45, which is meshed with it, to rotate. The rotation of the driven bevel gear 45 causes the top screw 41 to rotate. The screw sleeve 46 is threadedly connected to the screw 41. The cleaning brush 47 is fixed on the lower surface of the screw sleeve 46. The rotation of the screw 41 causes the screw sleeve 46 to move left and right. The movement of the screw sleeve 46 causes the cleaning brush 47 to move. The movement of the cleaning brush 47 can clean the surface of the screen 3 to prevent the screen 3 from clogging, thereby ensuring the continuity and efficiency of screening.

[0036] In this embodiment, three screws 41 are evenly distributed in the inner cavity of the sieve body 1. The top screw 41 and the middle screw 41, and the bottom screw 41 and the middle screw 41 are all connected by belt drive. The rotation of the top screw 41 drives the rotation of the middle screw 41 through the belt, and further drives the rotation of the bottom screw 41 through the belt. An L-shaped plate is fixed on the back of the screw sleeve 46. Three sliding grooves are opened in the inner wall of the sieve body 1. The L-shaped plate moves horizontally in the inner cavity of the sliding groove to limit the movement of the screw sleeve 46, so that it can only move in a straight line.

[0037] It should be noted that a timer can be set for the motor 43, thereby enabling the control system to periodically drive the cleaning brush 47 to clean the surface of the screen 3.

[0038] Please see Figure 4 To improve screening efficiency, the efficiency-enhancing mechanism 5 in this embodiment includes a protective box 51, a vibrator 52, two connecting plates 53, and two elastic elements 54. The protective box 51 is fixed to the lower surface of the screen 3 mounting bracket, and the vibrator 52 is fixed to the inner cavity of the protective box 51. The output shaft of the vibrator 52 passes through the protective box 51 and extends to the upper side of the protective box 51 and is fixed to the screen 3. When the vibrator 52 is started, the output shaft of the vibrator 52 causes the screen 3 to vibrate. At this time, the screen 3 will move downward. The two connecting plates 53 are fixed to the opposite side of the left and right side walls of the inner cavity of the screening instrument body 1. The elastic elements 54 are fixed between the screen 3 and the opposite side of the connecting plates 53. The downward movement of the screen 3 causes the elastic elements 54 to be squeezed. After being subjected to force, the elastic elements 54 will move towards the screen 3, thereby causing the screen 3 to move upward.

[0039] In this embodiment, the elastic element 54 includes a telescopic rod and a spring, with the spring movably sleeved on the outer surface of the telescopic rod.

[0040] It should be noted that the screening efficiency can be improved by moving the screen 3 up and down.

[0041] The working principle of the above embodiments is as follows:

[0042] (1) During screening, the motor 43 is started. The output shaft of the motor 43 rotates and drives the active bevel gear 44 to rotate. The rotation of the active bevel gear 44 causes the driven bevel gear 45, which meshes with it, to rotate. The rotation of the driven bevel gear 45 causes the top screw 41 to rotate. At this time, the rotation of the top screw 41 drives the rotation of the middle screw 41 through the belt. Furthermore, the rotation of the middle screw 41 drives the rotation of the bottom screw 41 through the belt. Thus, the rotation of the screw 41 causes the screw sleeve 46 to move left and right. The screw sleeve 46 can only move in a straight line under the limit of the L-shaped plate and the slide groove. The movement of the screw sleeve 46 drives the cleaning brush 47 to move. The movement of the cleaning brush 47 can clean the surface of the screen 3 to prevent the screen 3 from clogging, thereby ensuring the continuity and efficiency of screening.

[0043] (2) When using, collect the cement sample to be tested, place the cement sample on the screen 3 through the feed port 2, and then start the vibrator 52. The output shaft of the vibrator 52 causes the screen 3 to vibrate. At this time, the screen 3 will move downward, causing the elastic element 54 to be squeezed. After the elastic element 54 is subjected to force, it will move towards the screen 3, thereby causing the screen 3 to move upward. The up and down movement of the screen 3 can improve the screening efficiency. Start the vacuum pump and blower, so that screening can be carried out under the action of vibration and negative pressure. The control system monitors the negative pressure intensity in real time and automatically adjusts the working state of the vacuum pump and blower as needed to achieve stable control of negative pressure, thereby ensuring the accuracy of screening. Finally, the particle size distribution of cement particles can be calculated based on the intercepted material of each layer of screen 3, thereby determining the fineness of cement. The cement particles that fall off the screen can be collected in the inner cavity of the collection box through the discharge port.

Claims

1. A cement fineness negative pressure sieve analyzer, comprising a sieve analyzer body (1), characterized in that: The upper surface of the sieve analyzer body (1) is provided with a feed inlet (2), the inner cavity of the sieve analyzer body (1) is provided with three layers of screens (3), the left and right side walls of the inner cavity of the sieve analyzer body (1) are provided with an anti-blocking mechanism (4) to prevent the screens (3) from being blocked, and the center of the lower surface of the screens (3) is provided with an efficiency-enhancing mechanism (5) to improve the screening efficiency. The anti-clogging mechanism (4) includes three screws (41), a fixed box (42), a motor (43), a driving bevel gear (44), a driven bevel gear (45), three screw sleeves (46), and three cleaning brushes (47). The right side of the screws (41) is rotatably connected to the right side wall of the inner cavity of the sieve body (1) via a bearing. The fixed box (42) is fixed to the top left side of the sieve body (1). The left side of the screws (41) penetrates the left side wall of the inner cavity of the sieve body (1) and extends into the inner cavity of the fixed box (42) and is connected to the fixed box (47). The left side wall of the inner cavity of the fixed box (42) is rotatably connected by bearings. The motor (43) is fixed to the right end of the top wall of the fixed box (42). The driving bevel gear (44) is fixed to the bottom of the outer surface of the output shaft of the motor (43). The driven bevel gear (45) is fixed to the right end of the outer surface of the top screw (41). The driving bevel gear (44) and the driven bevel gear (45) are meshed together. The screw sleeve (46) is threadedly connected to the screw (41). The cleaning brush (47) is fixed to the lower surface of the screw sleeve (46).

2. The cement fineness negative pressure sieve analyzer according to claim 1, characterized in that: Fans are fixed to the front sides of the left and right ends of the bottom wall of the sieve body (1), and vacuum pumps are fixed to the rear sides of the left and right ends of the bottom wall of the sieve body (1). The input ends of the fans and vacuum pumps are connected to inclined air hoods. A filter screen is fixed to the upper surface of the air hoods. The output ends of the fans and vacuum pumps pass through the sieve body (1) and extend to the outside of the sieve body (1).

3. The cement fineness negative pressure sieve analyzer according to claim 1, characterized in that: The bottom wall of the sieve analyzer body (1) is provided with a discharge port. Support seats are fixed at both ends of the lower surface of the sieve analyzer body (1). The same collection box is placed on the upper surface of the two support seats. The size of the inner cavity of the collection box is larger than the size of the discharge port.

4. The cement fineness negative pressure sieve analyzer according to claim 1, characterized in that: The three screws (41) are evenly distributed in the inner cavity of the sieve analyzer body (1). The top screw (41) and the middle screw (41) and the bottom screw (41) and the middle screw (41) are all connected by belt drive.

5. The cement fineness negative pressure sieve analyzer according to claim 1, characterized in that: The back of the screw sleeve (46) is fixed with an L-shaped plate, and the inner wall of the sieve body (1) is provided with three sliding grooves. The L-shaped plate moves horizontally in the inner cavity of the sliding groove.

6. The cement fineness negative pressure sieve analyzer according to claim 1, characterized in that: The screen (3) includes a mounting frame and screen plates at the left and right ends, and the mesh count of the three screens (3) increases sequentially from top to bottom.

7. The cement fineness negative pressure sieve analyzer according to claim 1, characterized in that: The efficiency improvement mechanism (5) includes a protective box (51), a vibrator (52), two connecting plates (53) and two elastic elements (54). The protective box (51) is fixed on the lower surface of the screen (3) mounting bracket. The vibrator (52) is fixed in the inner cavity of the protective box (51). The output shaft of the vibrator (52) passes through the protective box (51) and extends to the upper side of the protective box (51) and is fixed to the screen (3). The two connecting plates (53) are fixed on the opposite side of the left and right side walls of the inner cavity of the screen analyzer body (1). The elastic elements (54) are fixed between the screen (3) and the opposite side of the connecting plates (53).

8. The cement fineness negative pressure sieve analyzer according to claim 7, characterized in that: The elastic element (54) includes a telescopic rod and a spring, with the spring movably sleeved on the outer surface of the telescopic rod.

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