A cement fineness negative pressure sieve analyzer

Abstract

This utility model discloses a negative pressure sieve analyzer for cement fineness, relating to the technical field of negative pressure sieve analyzers. It includes a housing; a sieve cover located at the top of the housing; a first handle located at the top of the sieve cover; a sieve cylinder located at the bottom of the housing and cooperating with the sieve cover; a vibration component located inside the sieve cylinder, providing continuous vibration power for the sieving process to improve sieving efficiency; a sieve screen located at the top inner edge of the vibration component; a rotating component located at the bottom of the sieve cover and cooperating with the vibration component, driving the vibration component to vibrate and uniformly disperse the cement sample during sieving, thereby improving sieving efficiency and testing accuracy; a cyclone separator located at the top inner edge of the housing; and a vent pipe connecting the sieve cylinder, the cyclone separator, and the housing. This utility model has a reasonable and reliable structure. By incorporating the vibration and rotating components, the sieve screen completes a more efficient and uniform sieving process under the dual power of vibration and rotation.

Description

Technical Field

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

[0002] In the production of building materials, especially in the manufacturing of paving bricks and concrete bricks, accurate determination of cement fineness is crucial for ensuring the quality of the final product. Negative pressure sieve analyzers, as key equipment for assessing cement fineness, play an indispensable role in these applications. While traditional negative pressure sieve analyzers can basically meet screening requirements, they still have some limitations in practical use, such as low screening efficiency, complex operation procedures, inconvenient maintenance, and insufficient adaptability to different working environments. These problems not only affect work efficiency but also pose challenges to the quality control of the final product.

[0003] Existing cement fineness negative pressure sieve analyzers, although equipped with brushes that can continuously scrape the sidewalls of the sieve during the sieving process to reduce the amount of sample clogging the sieve holes, cannot effectively spread and evenly distribute cement particles on the sieve surface because the brushes can only clean the sidewalls of the sieve. This affects the sieving efficiency and the accuracy of the test results.

[0004] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0005] In view of the problems in the related technologies, this utility model proposes a cement fineness negative pressure sieve analyzer to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by this utility model is as follows:

[0007] A cement fineness negative pressure sieve analyzer includes a housing; a sieve cover disposed on the top of the housing; a first handle disposed on the top of the sieve cover; a sieve analysis cylinder disposed on the bottom of the housing and cooperating with the sieve cover; a vibration component disposed inside the sieve analysis cylinder and providing continuous vibration power for the sieving process to improve sieving efficiency; a sieve screen disposed on the inner top of the vibration component; a rotating component disposed on the bottom of the sieve cover and cooperating with the vibration component, driving the vibration component to vibrate, so that the cement sample is evenly dispersed during the sieving process to improve sieving efficiency and testing accuracy; a cyclone separator disposed on the inner top of the housing; and a vent pipe connecting the sieve analysis cylinder, the cyclone separator, and the housing.

[0008] Furthermore, in order to improve the flow efficiency of materials during the screening process and reduce the risk of clumping and blockage caused by the aggregation of cement fine powder, the bottom of the screening cylinder is set in a conical shape to guide the screened cement particles to slide down the inner wall naturally, so as to prevent the material from forming dead corners or clumping and blocking at the bottom.

[0009] Furthermore, in order to provide stable vibration power during the screening process, the vibration assembly includes several dampers installed inside the screening cylinder. One end of each damper is provided with a cylinder, and the inner circumference of the cylinder is provided with an annular locking block that cooperates with the screen. A spring is sleeved on the outer circumference of the damper.

[0010] Furthermore, in order to improve the ease of assembly and sealing of the screen, and to effectively prevent the screen from shifting or loosening under the combined effects of vibration and rotation, an annular plate is provided on the top of the screen, and a snap-fit ​​groove is provided at the bottom of the annular plate to cooperate with the annular snap-fit ​​block.

[0011] Furthermore, in order to ensure the stability and concentricity of the screen installation and to facilitate the replacement of screens of different specifications to meet various fineness testing requirements, the outer diameter of the screen is smaller than the inner diameter of the annular snap-fit ​​block.

[0012] Furthermore, in order to effectively break the static accumulation of cement samples on the sieve surface and promote the rapid and uniform distribution of materials on the sieve surface, thereby improving sieving efficiency and detection accuracy, the rotating component includes a rotating shaft located at the bottom of the sieve cover. A connecting rod is provided on the outer circumference of the rotating shaft, and rollers are symmetrically arranged at both ends of the connecting rod. An arc-shaped plate is symmetrically arranged at the top of the connecting rod, and an arc-shaped slider is arranged at the top of the arc-shaped plate. The rotating shaft and the connecting rod are connected by a pin. The top of the rotating shaft passes through the sieve cover and is connected to the output shaft of the servo motor. The servo motor is equipped with a protective shell.

[0013] Furthermore, to ensure the guidance and stability of the rotating component during operation, the bottom of the screen cover is equipped with an annular slide rail that cooperates with the arc-shaped slider.

[0014] Furthermore, in order to ensure that the arc-shaped slider can slide smoothly along the set path during rotation, effectively enhancing the linkage accuracy between the screen cover and the rotating component, the inner diameter of the annular slide rail is the same as the movement trajectory of the arc-shaped slider.

[0015] Furthermore, in order to effectively prevent dust leakage during the screening process and ensure stable operation under negative pressure during screening, several sealing gaskets arranged linearly from top to bottom are provided on the bottom circumferential outer wall of the screen cover.

[0016] Furthermore, to enhance ease of operation and human-computer interaction, a door panel is provided on one side of the enclosure, and a control panel and a second door handle are sequentially located on one side of the door panel.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. This utility model has a reasonable and reliable structure and is simple to operate. By setting up a vibration component and a rotation component and achieving their linkage, the screen completes a more efficient and uniform screening process under the dual power of vibration and rotation. This not only optimizes screening efficiency and detection accuracy but also reduces ineffective energy consumption through power coordination and rational energy distribution, demonstrating excellent energy-saving characteristics. Simultaneously, the rotation component uses an eccentrically mounted servo motor to drive the shaft rotation, reducing wasted drive power while ensuring precise control; it drives the connecting rod and rollers to move synchronously, allowing the rollers to periodically contact and act on the vibration component, thereby stimulating the screen to generate stable and efficient composite vibration. This vibration method effectively breaks the static accumulation state of cement samples on the screen surface, promoting rapid and uniform material distribution, improving screening efficiency and the accuracy of fineness detection.

[0019] 2. This utility model, by incorporating a vibration component and combining it with the synergistic effect of a rotation component, enables the screen to achieve a more efficient and uniform screening process under the dual power drive of vibration and rotation. The damper and spring in the vibration component work together to provide stable vibration power while effectively buffering the impact force generated during equipment operation, thereby enhancing the structural stability and operational smoothness of the screen under high-frequency vibration.

[0020] 3. This invention achieves precise drive control of the rotating shaft by setting up a rotating component and installing a servo motor at an eccentric position on the screen cover. This not only improves the power transmission efficiency of the rotating component but also enhances the stability and uniformity of the rotational motion during screening. The servo motor drives the rotating shaft to rotate, further driving the connecting rod and the rollers at both ends to move synchronously, allowing the rollers to periodically contact and act on the vibrating component, thereby stimulating the screen to generate continuous and stable composite vibration. This vibration method effectively breaks the static accumulation state of cement samples on the screen surface, enabling the material to be quickly and uniformly distributed on the screen, effectively improving screening efficiency and the accuracy of fineness detection. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is one of the structural schematic diagrams of a cement fineness negative pressure sieve analyzer according to an embodiment of the present utility model;

[0023] Figure 2 This is a second structural schematic diagram of a cement fineness negative pressure sieve analyzer according to an embodiment of the present utility model;

[0024] Figure 3 This is a cross-sectional view of a cement fineness negative pressure sieve analyzer according to an embodiment of the present utility model;

[0025] Figure 4 This is a schematic diagram of the rotating component in a cement fineness negative pressure sieve analyzer according to an embodiment of the present invention;

[0026] Figure 5 This is a partial structural schematic diagram of the rotating component in a cement fineness negative pressure sieve analyzer according to an embodiment of the present utility model;

[0027] Figure 6 This is a partial structural schematic diagram of a cement fineness negative pressure sieve analyzer according to an embodiment of the present utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the screen in a cement fineness negative pressure sieve analyzer according to an embodiment of the present utility model.

[0029] In the picture:

[0030] 1. Box body; 2. Screen cover; 3. Screening cylinder; 4. Vibration assembly; 401. Damper; 402. Cylinder; 403. Annular snap-fit ​​block; 404. Spring; 5. Screen mesh; 6. Rotating assembly; 601. Shaft; 602. Connecting rod; 603. Roller; 604. Arc plate; 605. Arc slider; 606. Pin; 607. Servo motor; 608. Protective shell; 7. Cyclone tube; 8. Vent pipe; 9. First handle; 10. Annular plate; 11. Snap-fit ​​groove; 12. Annular slide rail; 13. Sealing gasket; 14. Door panel; 15. Control panel; 16. Second handle. Detailed Implementation

[0031] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0032] According to an embodiment of the present invention, a cement fineness negative pressure sieve analyzer is provided.

[0033] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figures 1-7As shown, a cement fineness negative pressure sieve analyzer according to an embodiment of the present invention includes a housing 1; a sieve cover 2, disposed on the top of the housing 1; a first handle 9, disposed on the top of the sieve cover 2; a sieve analysis cylinder 3, disposed on the bottom of the housing 1 and cooperating with the sieve cover 2; a vibration component 4, disposed inside the sieve analysis cylinder 3, and providing continuous vibration power for the sieving process to improve sieving efficiency; a sieve screen 5, disposed on the inner top of the vibration component 4; a rotating component 6, disposed on the bottom of the sieve cover 2 and cooperating with the vibration component 4, driving the vibration component 4 to vibrate, so that the cement sample is evenly dispersed during the sieving process to improve sieving efficiency and testing accuracy; a cyclone separator 7, disposed on the inner top of the housing 1; and a ventilation pipe 8, connecting the sieve analysis cylinder 3, the cyclone separator 7, and the housing 1.

[0034] By employing the aforementioned technical solution of this utility model, and through the arrangement of the vibration component 4 and the rotation component 6, and the coordinated operation between the two, the screen 5 achieves a more efficient and uniform screening process under the dual power of vibration and rotation. This not only optimizes screening efficiency and detection accuracy but also reduces ineffective energy consumption through power coordination and rational energy distribution, demonstrating excellent energy-saving characteristics. Simultaneously, the rotation component 6 uses an eccentrically mounted servo motor 607 to drive the rotating shaft 601, reducing wasted drive power while ensuring precise control; it also drives the connecting rod 602 and roller 603 to move synchronously, allowing the roller 603 to periodically contact and act on the vibration component 4, thereby stimulating the screen 5 to generate stable and efficient composite vibration. This vibration method effectively breaks the static accumulation state of cement samples on the screen surface, promoting rapid and uniform material distribution, and improving screening efficiency and the accuracy of fineness detection.

[0035] Specifically, the control panel 15 is equipped with a human-machine interface (HMI) and a PLC (Programmable Logic Controller). The HMI is the interface between the operator and the automation system. Its main function is to display the real-time operating status and the input of control commands. The PLC is used to execute specific control tasks, such as switch and sensor signal acquisition and processing.

[0036] It should be explained that the damper 401 is equipped with universal joints at both ends, which can effectively adapt to and compensate for the displacement and angle changes caused by the vibration component 4 when vibrating the screen 5, and ensure that the force transmitted to the screen 5 during the vibration process is more uniform and stable.

[0037] During operation, the cyclone separator 7 generates a strong centrifugal force, causing dust particles to be thrown against the separator wall and then slide down the wall into the ash hopper under gravity. The gas, after dust removal, forms an upward vortex at the center of the cyclone separator 7 and is discharged to the outside of the housing 1 through the top vent pipe 8. The ash discharge valve or cover of the ash hopper should be opened periodically to clean out accumulated dust or materials. After cleaning, the relevant components should be reinstalled to ensure the cyclone separator 7 returns to normal operation.

[0038] The end of the ventilation pipe 8 is connected to a bag filter device. When the cyclone 7 is running, the dust-laden airflow generated during the sieving process will be filtered through the bag filter for high efficiency, effectively intercepting fine particulate dust and preventing it from being directly discharged into the environment, thus ensuring the health of operators and the cleanliness of laboratory air.

[0039] Appropriate lubricant is periodically applied or injected into the interior or surface of the annular slide rail 12. The function of the lubricant is to reduce the coefficient of friction between the arc-shaped slider 605 and the annular slide rail 12, improve motion efficiency, effectively reduce mechanical wear, and extend the service life of the equipment.

[0040] In one embodiment, the bottom of the screening cylinder 3 is conical to guide the screened cement particles to slide naturally down the inner wall, preventing the material from forming dead corners or clogging at the bottom. This not only improves the flow efficiency of the material during screening but also reduces the risk of clogging caused by the aggregation of fine cement powder.

[0041] In one embodiment, the vibration assembly 4 includes a plurality of dampers 401 disposed inside the screening cylinder 3. One end of each damper 401 is provided with a cylinder 402, and the inner circumferential wall of the cylinder 402 is provided with an annular locking block 403 that cooperates with the screen 5. A spring 404 is sleeved on the outer circumferential wall of the damper 401. This provides stable vibration power during the screening process.

[0042] In one embodiment, the top of the screen 5 is provided with an annular plate 10, and the bottom of the annular plate 10 has a locking groove 11 that mates with the annular locking block 403. This not only improves the ease of assembly and sealing of the screen 5, but also effectively prevents the screen 5 from shifting or loosening under the combined effects of vibration and rotation.

[0043] In one embodiment, the outer diameter of the screen 5 is smaller than the inner diameter of the annular retaining block 403. This not only ensures the stability and concentricity of the screen 5 installation, but also facilitates the replacement of screens 5 of different specifications to meet various fineness testing needs.

[0044] In one embodiment, the rotating assembly 6 includes a rotating shaft 601 disposed at the bottom of the sieve cover 2. A connecting rod 602 is disposed on the outer circumference of the rotating shaft 601, and rollers 603 are symmetrically disposed at both ends of the connecting rod 602. An arc-shaped plate 604 is symmetrically disposed at the top of the connecting rod 602, and an arc-shaped slider 605 is disposed at the top of the arc-shaped plate 604. The rotating shaft 601 and the connecting rod 602 are connected by a pin 606. The top of the rotating shaft 601 passes through the sieve cover 2 and is connected to the output shaft of a servo motor 607. A protective shell 608 is disposed outside the servo motor 607. This not only effectively breaks the static accumulation state of cement samples on the sieve surface, promoting rapid and uniform distribution of materials on the sieve surface, but also improves sieving efficiency and detection accuracy.

[0045] The specific working principle of the vibration component 4 and the rotating component 6 is as follows: When negative pressure sieving is required to determine the fineness of cement, the operator can start the servo motor 607 through the control panel 15, and its output shaft drives the rotating shaft 601 to rotate. The rotating shaft 601 is detachably connected to the connecting rod 602 through the pin 606, thereby driving the connecting rod to rotate synchronously under the drive of the servo motor 607. Rollers 603 are symmetrically arranged at both ends of the connecting rod 602, and an arc-shaped slider 605 is also provided at its top. Since the servo motor 607 is installed at an eccentric position on the screen cover 2, the rollers 603 can periodically contact and act on the vibration component 4 during rotation, thereby exciting the screen system to generate composite vibration. Furthermore, an annular slide rail 12 that cooperates with the arc-shaped slider 605 is provided at the bottom of the screen cover 2, so that the arc-shaped slider can slide smoothly in the slide groove, ensuring the stability and guidance of the rotating component 6, and improving the dynamic balance performance during the sieving process. Meanwhile, the damper 401 inside the vibration assembly 4 works in conjunction with the spring 404 to provide stable and efficient vibration power under the periodic excitation of the roller 603. This vibration not only breaks the static accumulation state of the cement sample on the screen surface, but also promotes the rapid and uniform distribution of material on the screen, thereby improving screening efficiency and the accuracy of test results.

[0046] In one embodiment, the bottom of the screen cover 2 is provided with an annular slide rail 12 that cooperates with the arc-shaped slider 605. This ensures the guidance and stability of the rotating assembly 6 during operation.

[0047] In one embodiment, the inner diameter of the annular slide rail 12 is the same as the movement trajectory of the arc-shaped slider 605. This ensures that the arc-shaped slider 605 can slide smoothly along the set path during rotation, and also effectively enhances the linkage accuracy between the screen cover 2 and the rotating assembly 6.

[0048] In one embodiment, the bottom circumferential outer wall of the sieve cover 2 is provided with a plurality of sealing gaskets 13 arranged linearly from top to bottom. This not only effectively prevents dust leakage during the sieving process, but also ensures stable operation under negative pressure during sieving.

[0049] In one embodiment, for the housing 1, a door panel 14 is provided on one side of the housing 1, and a control panel 15 and a second door handle 16 are sequentially provided on one side of the door panel 14. This improves the ease of operation and human-computer interaction experience.

[0050] To facilitate understanding of the above-mentioned technical solutions of this utility model, the working principle or operation method of this utility model in actual process will be described in detail below.

[0051] like Figures 1-7 As shown, in practical applications, the control panel 15 is electrically connected to the servo motor 607 and the cyclone separator 7 in sequence. When negative pressure sieving is required to determine the fineness of cement, the operator first places the cement sample required for the experiment into the sieve 5, then installs the sieve 5 into the snap-fit ​​groove 11, and covers it with the sieve cover 2 to achieve a seal. The multi-layer sealing gasket 13 at the bottom of the sieve cover 2 can effectively prevent dust leakage during the sieving process, improving the cleanliness of the testing environment and the reliability of the test data.

[0052] Next, the staff started the cyclone 7 through the human-machine interface (HMI) of the control panel 15, which generated negative pressure in the ventilation pipe 8 and transmitted the negative pressure to the inside of the screening cylinder 3, thereby creating a stable negative pressure environment in the device.

[0053] Simultaneously, the operator activates the eccentrically mounted servo motor 607 via control panel 15, driving the rotating shaft 601 to rotate, which in turn drives the connecting rod 602 and the rollers 603 at both ends to move synchronously. The rollers 603 periodically contact and act on the vibration component 4, thereby exciting the screen 5 to generate stable and efficient composite vibration. Under the combined action of negative pressure airflow and vibration, fine particles smaller than the aperture of the screen 5 are carried out of the screen 5 by the airflow and collected through a cloth bag, while coarse particles larger than the screen aperture remain on the screen 5, thus completing efficient screening and achieving the purpose of accurately determining the fineness of cement.

[0054] Finally, after the screening process is completed, the staff opens the door panel 14 by pulling the second handle 16, opens the ash hopper at the bottom of the cyclone 7, cleans the dust or materials accumulated inside, and reinstalls the relevant parts to ensure that the cyclone 7 returns to normal operation.

[0055] In summary, by utilizing the above-mentioned technical solution of this utility model, and by setting up the vibration component 4 and the rotating component 6, and achieving their linkage, the screen 5 completes a more efficient and uniform screening process under the dual power of vibration and rotation. This not only optimizes screening efficiency and detection accuracy but also reduces ineffective energy consumption through power synergy and rational energy distribution, demonstrating excellent energy-saving characteristics. Simultaneously, the rotating component 6 uses an eccentrically mounted servo motor 607 to drive the rotating shaft 601 to rotate, reducing wasted drive power while ensuring precise control; it also drives the connecting rod 602 and roller 603 to move synchronously, allowing the roller 603 to periodically contact and act on the vibration component 4, thereby stimulating the screen 5 to generate stable and efficient composite vibration. This vibration method effectively breaks the static accumulation state of cement samples on the screen surface, promoting rapid and uniform material distribution, and improving screening efficiency and the accuracy of fineness detection. This utility model, by setting up the vibration component 4 and combining it with the synergistic effect of the rotating component 6, enables the screen 5 to achieve a more efficient and uniform screening process under the dual power of vibration and rotation. The damper 401 and spring 404 in the vibration assembly 4 work together to provide stable vibration power while effectively buffering the impact force generated during equipment operation, thus enhancing the structural stability and operational smoothness of the screen 5 under high-frequency vibration. This invention achieves precise drive control of the rotating shaft 601 by setting a rotating assembly 6 and installing a servo motor 607 at an eccentric position on the screen cover 2. This not only improves the power transmission efficiency of the rotating assembly 6 but also enhances the stability and uniformity of the rotational motion during screening. The servo motor 607 drives the rotating shaft to rotate, further driving the connecting rod 602 and the rollers 603 at both ends to move synchronously, allowing the rollers 603 to periodically contact and act on the vibration assembly 4, thereby stimulating the screen 5 to generate continuous and stable composite vibration. This vibration method effectively breaks the static accumulation state of cement samples on the screen surface, enabling rapid and uniform distribution of materials on the screen 5, effectively improving screening efficiency and the accuracy of fineness detection.

[0056] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0057] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A cement fineness negative pressure sieve analyzer, characterized in that, include: Box (1); A sieve cover (2) is disposed on the top of the box body (1); The first handle (9) is located at the top of the sieve cover (2); The sieve tube (3) is located at the bottom of the box (1) and is fitted with the sieve cover (2); The vibration component (4) is disposed inside the screening cylinder (3) and provides continuous vibration power for the screening process to improve screening efficiency. A screen (5) is disposed at the inner top of the vibration assembly (4); The rotating component (6) is located at the bottom of the sieve cover (2) and cooperates with the vibration component (4). By driving the vibration component (4) to vibrate, the cement sample is evenly dispersed during the sieving process, so as to improve the sieving efficiency and testing accuracy. Cyclone tube (7) is installed at the top inside the box (1); A ventilation pipe (8) is connected between the sieve cylinder (3), the cyclone cylinder (7), and the box body (1).

2. The cement fineness negative pressure sieve analyzer according to claim 1, characterized in that, The bottom of the screening cylinder (3) is cone-shaped to guide the screened cement particles to slide naturally down the inner wall, so as to prevent the material from forming dead corners or clogging at the bottom.

3. The cement fineness negative pressure sieve analyzer according to claim 1, characterized in that, The vibration assembly (4) includes a plurality of dampers (401) disposed inside the sieve cylinder (3). One end of the plurality of dampers (401) is provided with a cylinder (402), and the inner circumferential wall of the cylinder (402) is provided with an annular snap-fit ​​block (403) that cooperates with the sieve (5). The damper (401) is fitted with a spring (404) on its outer circumferential wall.

4. The cement fineness negative pressure sieve analyzer according to claim 3, characterized in that, The top of the screen (5) is provided with an annular plate (10), and the bottom of the annular plate (10) is provided with a snap-fit ​​groove (11) that cooperates with the annular snap-fit ​​block (403).

5. A cement fineness negative pressure sieve analyzer according to claim 4, characterized in that, The outer diameter of the screen (5) is smaller than the inner diameter of the annular snap-fit ​​block (403).

6. The cement fineness negative pressure sieve analyzer according to claim 1, characterized in that, The rotating assembly (6) includes a rotating shaft (601) disposed at the bottom of the screen cover (2), a connecting rod (602) is disposed on the outer circumference of the rotating shaft (601), and rollers (603) are symmetrically disposed at both ends of the connecting rod (602). The top end of the connecting rod (602) is symmetrically provided with an arc-shaped plate (604), and the top end of the arc-shaped plate (604) is provided with an arc-shaped slider (605). The rotating shaft (601) and the connecting rod (602) are connected by a pin (606); The top of the rotating shaft (601) passes through the screen cover (2) and is connected to the output shaft of the servo motor (607). The servo motor (607) is provided with a protective shell (608).

7. A cement fineness negative pressure sieve analyzer according to claim 6, characterized in that, The bottom of the sieve cover (2) is provided with an annular slide rail (12) that cooperates with the arc-shaped slider (605).

8. A cement fineness negative pressure sieve analyzer according to claim 7, characterized in that, The inner diameter of the annular slide rail (12) is the same as the motion trajectory of the arc-shaped slider (605).

9. A cement fineness negative pressure sieve analyzer according to claim 1, characterized in that, The bottom circumferential outer wall of the sieve cover (2) is provided with several sealing gaskets (13) arranged linearly from top to bottom.

10. A cement fineness negative pressure sieve analyzer according to claim 1, characterized in that, A door panel (14) is provided on one side of the box (1), and a control panel (15) and a second door handle (16) are provided on one side of the door panel (14).

Images