Detection device and method for cement fineness

Abstract

The invention belongs to the technical field of cement detection, and particularly discloses a cement fineness detection device and method.The cement fineness detection device comprises a case, a pair of case doors are hinged to one side of the outer wall of the case, a controller is arranged on one side of the outer wall of the case, a negative pressure cylinder is fixedly connected to the top of the case, a negative pressure mechanism is arranged in the case, and the negative pressure cylinder is fixedly connected to the bottom of the case. A negative pressure mechanism is arranged in the negative pressure cylinder, the negative pressure mechanism communicates with the negative pressure cylinder, an anti-blocking mechanism is arranged in the negative pressure cylinder, a screen box is clamped to the inner wall of the negative pressure cylinder, a screen mesh is arranged at the bottom of the screen box, and a sealing cover is clamped and slidably connected to the top of the screen box. According to the screening device for the cement detection sample, the internal cement detection sample can be blown away, so that the screening efficiency is improved, the ground can be cleaned by the blown air flow through the arrangement of the structures, the cement detection sample can be fully screened in the detection process, meanwhile, knocking is not needed, and mechanical damage to the cement detection sample is avoided.

Description

Technical Field

[0001] The invention belongs to the field of cement detection, and specifically discloses a device and method for detecting cement fineness. Background Art

[0002] Cement fineness refers to the coarseness and fineness of cement particles. It is an important indicator of cement physical properties and directly affects the working performance of cement and the quality of the final product.

[0003] Negative pressure sieving analysis is a commonly used cement fineness detection method, which is suitable for measuring various types of cement. This method uses a negative pressure sieving analyzer and airflow as the screening power medium to sieve the cement sample on the sieve to obtain cement particles of different particle sizes. After screening, the cement particles remaining on the sieve are weighed and the mass percentage of the sieve residue is calculated to evaluate the fineness of the cement.

[0004] During the screening process, finer cement particles are easily lifted up by wind and adhere to the cover and the wall of the sieve box. At this time, the user needs to continuously knock on the cover to make these particles fall down. There are already many solutions in the prior art that use automated equipment to replace manual knocking. Although it can replace manual labor and reduce the user's labor, the sieve box and the cover need to be constantly struck, which will greatly increase the wear of both during use. At the same time, the knocking will also loosen the fixation of the sieve box, thereby connecting the negative pressure space to the outside, resulting in insufficient internal suction and reduced efficiency in screening cement particles, which ultimately affects the screening results. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a device and method for detecting cement fineness, so as to solve the problem in the prior art that the method of knocking particles to make them fall will reduce the service life of the inspection tool.

[0006] To achieve the above purpose, the present invention provides a device and method for detecting cement fineness, comprising a chassis, a pair of cabinet doors are hingedly connected to one side of the outer wall of the chassis, a controller is arranged on one side of the outer wall of the chassis, a negative pressure cylinder is fixedly connected to the top of the chassis, a negative pressure mechanism is arranged inside the chassis, and the negative pressure mechanism is communicated with the negative pressure cylinder, an anti-blocking mechanism is arranged inside the negative pressure cylinder, a screen box is clamped on the inner wall of the negative pressure cylinder, a screen is arranged at the bottom of the screen box, a cover is clamped and slidably connected to the top of the screen box, a blowing assembly is arranged inside the cover, and an adjusting assembly is arranged above the chassis; The blowing assembly is used to blow air toward the inner wall of the negative pressure cylinder and the bottom of the outer wall of the cover; The adjusting assembly is used to drive the sealing cover to move up and down.

[0007] In the above technical solution, preferably, a groove shaped as a circular ring is opened on the bottom outer edge of the sieve box, a first sealing ring matched with the shape of the groove is fixedly connected inside the groove, and the first sealing ring is set as an elastic structure, a convex ring shaped as a circular ring is fixedly connected to the upper section of the inner wall of the negative pressure cylinder, a clamping column matched with the shape of the convex ring is fixedly connected to the top of the outer wall of the convex ring, and extrusion blocks matched with the shape of the clamping column are fixedly connected to the edges of both sides of the top of the clamping column.

[0008] In the above technical scheme, preferably, the blowing assembly includes a rotating cylinder inserted and rotatably connected to the middle of the outer wall of the cover, the inner wall of the rotating cylinder is fixedly connected to a pair of upper and lower bearing members, the interior of the bearing members is fixedly connected to a fixed cylinder, and the top of the outer wall of the fixed cylinder extends out of the interior of the rotating cylinder, the bottom of the inner wall of the fixed cylinder is fixedly connected to a plurality of circumferentially arranged connecting members, a baffle plate is fixedly connected below the connecting member, an air pipe is inserted into the interior of the fixed cylinder, the other end of the air pipe is fixedly connected to an air supply mechanism, and the air supply mechanism is arranged inside the chassis, a circular air hole is opened at the bottom of the outer wall of the rotating cylinder, and a first exhaust hole is opened in the middle of the outer wall of the baffle plate.

[0009] In the above technical scheme, preferably, a gear ring is fixedly connected to the top of the outer wall of the rotating cylinder, a gear is provided on one side of the gear ring, and the gear is meshed with the gear ring, a second transmission shaft is inserted and fixedly connected to the middle of the gear, and the bottom of the second transmission shaft is inserted and rotatably connected to the top of the cover, a fixed frame is fixedly connected to the top of the outer wall of the fixed cylinder, and the second transmission shaft is inserted through and inserted on the top of the outer wall of the fixed frame and rotatably connected thereto, a connecting rod is fixedly connected between the cover and the fixed frame, a movable plate is fixedly connected to the top of the fixed frame, a second motor is fixedly connected to the bottom of the outer wall of the movable plate, and the output end of the second motor is connected to the end of the second transmission shaft, the outer wall of the movable plate is slidably connected to the same fixing frame on both sides, and the fixing frame is fixedly connected to the top of the outer wall of the chassis, a second arc-shaped air hole is opened on one side of the bottom of the outer wall of the rotating cylinder, and the opening position of the second arc-shaped air hole corresponds to the connecting piece.

[0010] In the above technical solution, preferably, a plurality of second exhaust holes are opened at the bottom of the baffle plate and form a circular array around the first exhaust hole, a first arc-shaped air hole is opened at the bottom of the outer wall of the rotating cylinder, and the opening position of the first arc-shaped air hole corresponds to the position of the second exhaust hole.

[0011] In the above technical scheme, preferably, the adjusting mechanism includes a first motor fixedly connected to one side of the outer wall of the fixed frame, the output end of the first motor is fixedly connected to the first transmission shaft, and the first transmission shaft is inserted and rotatably connected to the top of the inner wall of the fixed frame, the outer wall of the first transmission shaft is provided with positive and negative wires, a pair of moving blocks are screwed on the outer walls of the positive and negative wires, a pair of guide rods are inserted and slidably connected to one side of the outer wall of the moving block, and the guide rods are fixedly connected to the inner wall of the fixed frame, connecting rods are inserted and rotatably connected on both sides of the outer wall of the moving block through shafts, the other end of the connecting rod is inserted and rotatably connected to a connecting block through a shaft, and the connecting block is fixedly connected to the top of the outer wall of the movable plate.

[0012] In the above technical solution, preferably, a second sealing ring is sleeved on the outer side wall of the cover, and a pair of observation windows are arranged on the top of the outer side wall of the cover, and the observation windows are made of transparent plastic.

[0013] In the above technical solution, preferably, the following steps are included: S1. First, place the sieve box containing the cement test sample inside the negative pressure cylinder and press it to fix the sieve box inside the negative pressure cylinder. Start the first motor through the controller. After the first motor is powered on, it drives the first transmission shaft to rotate rapidly, and finally drives the cover to move down and get stuck into the inside of the sieve box, thereby sealing the sieve box. S2. The anti-blocking mechanism and the negative pressure mechanism are sequentially activated by the controller to form a negative pressure environment inside the negative pressure cylinder and continuously vibrate the screen to screen the cement test sample; S3, starting the second motor and the air supply mechanism in sequence through the controller, forming an air flow to blow toward the inside of the sieve box and the bottom of the cover, and blowing up the cement test sample attached to the cover and gathered inside the sieve box; S4. Execute S during the execution of S and S. The cover slowly moves toward the inside of the sieve box to compress the activity space of the cement test sample, thereby improving the screening efficiency.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By setting up the blowing component, the gas is continuously blown into the screening box, which can blow away the cement test sample inside, thereby accelerating the screening efficiency. By setting up and other structures, the blown airflow can also clean the ground, thereby ensuring that the cement test sample is fully screened during the testing process, and there is no need to knock it to avoid mechanical damage to it; By setting up the downward pressure component, the position of the cover can be freely adjusted. During the detection process, it slowly moves downward along the inner wall of the sieve box, constantly compressing the space for the cement test sample to move, thereby further improving the screening efficiency of the cement test sample. At the same time, it prevents the cement test sample from adhering to the inner wall of the sieve box, and there is no need for additional knocking to avoid mechanical damage to it. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the internal structure of the chassis of the present invention; Figure 3 It is a schematic diagram of the internal structure of the negative pressure cylinder and the sieve box of the present invention; Figure 4 for Figure 3 Enlarged view of point A in the middle; Figure 5 for Figure 3 Enlarged view of point B in the middle; Figure 6 It is a schematic diagram of the transmission structure of the first motor and the first transmission shaft of the present invention; Figure 7 It is a schematic diagram of the transmission structure of the second motor and the second transmission shaft of the present invention; Figure 8 It is a schematic diagram of the sealing structure of the present invention; Fig. 9 It is a schematic diagram of the positional relationship between the rotating cylinder and the fixed cylinder of the present invention; Fig.10 It is a schematic diagram of the internal structure of the rotating drum of the present invention; Fig.11 It is a schematic diagram of the internal structure of the fixing cylinder of the present invention.

[0016] In the figure: 1, chassis; 2, door; 3, controller; 4, fixed frame; 5, negative pressure mechanism; 6, air supply mechanism; 7, negative pressure cylinder; 8, screen box; 9, screen; 10, anti-blocking mechanism; 11, slot; 12, first sealing ring; 13, convex ring; 14, clamping column; 15, extrusion block; 16, first motor; 17, first transmission shaft; 18, moving block; 19, positive and negative wires; 20, guide rod; 21, connecting rod; 22, connecting block; 23 , fixed frame; 24, movable plate; 25, second motor; 26, second transmission shaft; 27, gear; 28, connecting rod; 29, cover; 30, gear ring; 31, rotating cylinder; 32, observation window; 33, second sealing ring; 34, fixed cylinder; 35, bearing member; 36, circular air hole; 37, first arc-shaped air hole; 38, second arc-shaped air hole; 39, baffle; 40, first exhaust hole; 41, second exhaust hole; 42, connecting member. DETAILED DESCRIPTION

[0017] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0019] like Figure 1-Figure 11 The device and method for detecting cement fineness shown in the figure include a chassis 1, a pair of cabinet doors 2 are hingedly connected to one side of the outer wall of the chassis 1, a controller 3 is arranged on one side of the outer wall of the chassis 1, a negative pressure cylinder 7 is fixedly connected to the top of the chassis 1, a negative pressure mechanism 5 is arranged inside the chassis 1, and the negative pressure mechanism 5 is connected to the negative pressure cylinder 7, and an anti-blocking mechanism 10 is arranged inside the negative pressure cylinder 7. It should be noted that the negative pressure mechanism 5 and the anti-blocking mechanism 10 are both mature existing technologies. For example, the negative pressure mechanism 5 is composed of a vacuum cleaner, a pipe and a collection box, and the anti-blocking mechanism 10 is composed of a motor and a bump. It will not be repeated here. A sieve box 8 is engaged with the inner wall of the cylinder 7, a sieve mesh 9 is provided at the bottom of the sieve box 8, and a cover 29 is engaged and slidably connected to the top of the sieve box 8. The anti-blocking mechanism 10 and the negative pressure mechanism 5 are started in sequence by the controller 3. The negative pressure mechanism 5 forms a negative pressure environment inside the negative pressure cylinder 7. The anti-blocking mechanism 10 continuously vibrates the sieve mesh 9 to accelerate the vibration of the cement, thereby screening the cement test sample. A blowing component is provided inside the cover 29, and an adjusting component is provided above the chassis 1. The blowing component is used to blow airflow toward the inner wall of the negative pressure cylinder 7 and the bottom of the outer wall of the cover 29, and the adjusting component is used to drive the cover 29 to move up and down.

[0020] A groove 11 in the shape of a circular ring is provided on the bottom outer edge of the sieve box 8, and a first sealing ring 12 matching the shape of the groove 11 is fixedly connected inside the groove 11, and the first sealing ring 12 is set to an elastic structure, and a convex ring 13 in the shape of a circular ring is fixedly connected to the upper section of the inner wall of the negative pressure cylinder 7, and a clamping column 14 matching the shape of the convex ring 13 is fixedly connected to the top of the outer wall of the convex ring 13, and both side edges of the top of the clamping column 14 are fixedly connected with extrusion blocks 15 matching the shape of the clamping column 14. The sieve box 8 containing the cement test sample is placed inside the negative pressure cylinder 7, so that the clamping column 14 is aligned with the groove 11 and the sieve box 8 is pressed. At this time, the extrusion block 15 contacts the first sealing ring 12 and continuously squeezes it to deform it. During the process, the extrusion block 15 is inserted into both sides of the first sealing ring 12, and the first sealing ring 12 restores its shape under elastic deformation, and then continuously extrude the extrusion blocks 15 on both sides in the opposite direction, thereby increasing the friction between the two, and then completing the sealing and limiting of the sieve box 8.

[0021] The blowing assembly includes a rotating cylinder 31 inserted and rotatably connected to the middle of the outer wall of the cover 29, the inner wall of the rotating cylinder 31 is fixedly connected to a pair of upper and lower bearing members 35, the interior of the bearing member 35 is fixedly connected to a fixed cylinder 34, and a mechanical connection is made in the middle through the bearing member 35, the rotating cylinder 31 can rotate around the outer circumference of the fixed cylinder 34, and the top of the outer wall of the fixed cylinder 34 extends out of the interior of the rotating cylinder 31, and the bottom of the inner wall of the fixed cylinder 34 is fixedly connected to a plurality of circumferentially arranged connecting members 42, and a baffle plate 39 is fixedly connected below the connecting member 42, and there is a large space between the baffle plate 39 and the fixed cylinder 34, and an air pipe is inserted into the interior of the fixed cylinder 34 The other end of the air pipe is fixedly connected to an air supply mechanism 6, and the air supply mechanism 6 is arranged inside the chassis 1. A circular air hole 36 is opened at the bottom of the outer wall of the rotating cylinder 31, and a first exhaust hole 40 is opened in the middle of the outer wall of the baffle 39. After the air supply mechanism 6 is energized, air is blown out through the pipeline to the interior of the fixed cylinder 34. The airflow passes through the circular air hole 36 through the first exhaust hole 40 and enters the interior of the sieve box 8. Finally, the internal airflow flowing through the fixed cylinder 34 is restricted by the first exhaust hole 40 to form a more concentrated airflow, and blown to the interior of the sieve box 8. The blown airflow will make the cement test sample churn, and cooperate with the negative pressure mechanism 5 and the anti-blocking mechanism 10 to further improve the screening effect.

[0022] A gear ring 30 is fixedly connected to the top of the outer wall of the rotating cylinder 31, a gear 27 is provided on one side of the gear ring 30, and the gear 27 is meshed with the gear ring 30, and a second transmission shaft 26 is inserted and fixedly connected to the middle of the gear 27. Under the connection relationship between the gear ring 30 and the gear 27, the second transmission shaft 26 can drive the rotating cylinder 31 to rotate in a staggered manner, and the bottom of the second transmission shaft 26 is inserted and rotatably connected to the top of the cover 29, the top of the outer wall of the fixed cylinder 34 is fixedly connected to the fixed frame 23, and the second transmission shaft 26 penetrates and is inserted on the top of the outer wall of the fixed frame 23 and is rotatably connected thereto, a connecting rod 28 is fixedly connected between the cover 29 and the fixed frame 23, a movable plate 24 is fixedly connected to the top of the fixed frame 23, a second motor 25 is fixedly connected to the bottom of the outer wall of the movable plate 24, and an output end of the second motor 25 is connected to the end of the second transmission shaft 26, and the second transmission shaft 26 is driven to rotate by the second motor 25. The outer wall of the movable plate 24 is slidably connected with the same fixing frame 4, and the fixing frame 4 is fixedly connected to the top of the outer wall of the chassis 1. A second arc-shaped air hole 38 is opened on one side of the bottom of the outer wall of the rotating cylinder 31, and the opening position of the second arc-shaped air hole 38 corresponds to the connecting piece 42. Since the fixed cylinder 34 and the first exhaust hole 40 are connected by the connecting piece 42, there is a large gap between the two. The airflow passes through the second arc-shaped air hole 38 and blows to the bottom surface of the cover 29 to blow off the cement test sample attached thereto. After the second motor 25 is energized, it drives the second transmission shaft 26 to rotate, and drives the rotating cylinder 31 to rotate around the fixed cylinder 34 in a staggered manner, which correspondingly drives the first arc-shaped air hole 37 and the second arc-shaped air hole 38 to rotate. Because the first arc-shaped air hole 37 rotates continuously, the airflow blown out from the inside also changes continuously, thereby ensuring a strong blowing force and comprehensively cleaning the cement test sample attached to the cover 29.

[0023] A plurality of second exhaust holes 41 are provided at the bottom of the baffle plate 39 and form a circular array around the first exhaust hole 40. The airflow can be blown out through the second exhaust holes 41 and blow up the cement detection sample. A first arc-shaped air hole 37 is provided at the bottom of the outer wall of the rotating cylinder 31, and the opening position of the first arc-shaped air hole 37 corresponds to the position of the second exhaust hole 41. The first arc-shaped air hole 37 forms a shielding effect on the second exhaust hole 41. Because the rotating cylinder 31 is constantly rotating, the first arc-shaped air hole 37 is also constantly rotating, so the shielding of the second exhaust hole 41 is also constantly changing, and the position of the blown airflow is also constantly changing, thereby evenly blowing up the cement detection sample.

[0024] The adjustment mechanism includes a first motor 16 fixedly connected to one side of the outer wall of the fixing frame 4, the output end of the first motor 16 is fixedly connected to a first transmission shaft 17, and the first transmission shaft 17 is inserted and rotatably connected to the top of the inner wall of the fixing frame 4, the outer wall of the first transmission shaft 17 is provided with positive and negative wires 19, and a pair of moving blocks 18 are screwed on the outer wall of the positive and negative wires 19, and a pair of guide rods 20 are inserted and slidably connected to one side of the outer wall of the moving block 18, and the guide rods 20 are fixedly connected to the inner wall of the fixing frame 4, and both sides of the outer wall of the moving block 18 are inserted and rotatably connected through shafts. A connecting rod 21 is connected, and the other end of the connecting rod 21 is connected to a connecting block 22 through an axis insertion and rotation, and the connecting block 22 is fixedly connected to the top of the outer wall of the movable plate 24. The first motor 16 drives the first transmission shaft 17 to rotate, thereby driving the two moving blocks 18 to move toward each other. The force of the moving block 18 squeezes the connecting rod 21 to flip it, so that it gradually stands upright, and accordingly presses the movable plate 24 downward, and finally drives the cover 29 to move slowly downward. During the detection process, the internal space of the screen box 8 is continuously compressed to reduce the activity space of cement, thereby improving the screening efficiency.

[0025] A second sealing ring 33 is sleeved on the outer wall of the cover 29 , and a pair of observation windows 32 are arranged on the top of the outer wall of the cover 29 , and the observation windows 32 are made of transparent plastic. This design makes it easy for the user to observe the internal conditions of the sieve box 8 .

[0026] The present invention also provides a method for detecting cement fineness, comprising the following steps: S1. First, the sieve box 8 containing the cement test sample is placed inside the negative pressure cylinder 7 and pressed to fix the sieve box 8 inside the negative pressure cylinder 7. The first motor 16 is started by the controller 3. After the first motor 16 is powered on, it drives the first transmission shaft 17 to rotate rapidly, and finally drives the sealing cover 29 to move down and get stuck into the inside of the sieve box 8, thereby sealing the sieve box 8. S2, the anti-blocking mechanism 10 and the negative pressure mechanism 5 are sequentially activated by the controller 3, a negative pressure environment is formed inside the negative pressure cylinder 7, and the screen 9 is continuously vibrated, thereby screening the cement test sample; S3, starting the second motor 25 and the air supply mechanism 6 in sequence through the controller 3, forming an air flow to blow toward the inside of the sieve box 8 and the bottom of the cover 29, and blowing up the cement test sample attached to the cover 29 and gathered inside the sieve box 8; S4. Execute S1 during the execution of S2 and S3, and the cover 29 slowly moves toward the inside of the sieve box 8 to compress the activity space of the cement test sample, thereby improving the screening efficiency.

[0027] Working principle: First, the sieve box 8 containing the cement test sample is placed inside the negative pressure cylinder 7 and pressed to fix the sieve box 8 inside the negative pressure cylinder 7, and the first motor 16 is started by the controller 3. After the first motor 16 is energized, it drives the first transmission shaft 17 to rotate rapidly, and finally drives the cover 29 to move down and get stuck in the inside of the sieve box 8, thereby sealing the sieve box 8, and the anti-blocking mechanism 10 and the negative pressure mechanism 5 are started in sequence by the controller 3 to form a negative pressure environment inside the negative pressure cylinder 7, and the sieve 9 is continuously vibrated, thereby screening the cement test sample, and the second motor 25 and the air supply mechanism 6 are started in sequence by the controller 3 to form an airflow to the inside of the sieve box 8 and the bottom of the cover 29, blowing up the cement test sample attached to the cover 29 and gathered inside the sieve box 8, and the first motor 16 is started by the controller 3, and the first motor 16 drives the first transmission shaft 17 to rotate slowly, and finally drives the cover 29 to move slowly to the inside of the sieve box 8, compressing the activity space of the cement test sample, thereby improving the screening efficiency.

[0028] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention, and these changes and improvements fall within the scope of the present invention claimed.

Claims

1. A device and method for detecting cement fineness, comprising a case (1), a pair of case doors (2) being hingedly connected to one side of an outer wall of the case (1), and a controller (3) being arranged on one side of the outer wall of the case (1), characterized in that: The top of the chassis (1) is fixedly connected to a negative pressure cylinder (7), a negative pressure mechanism (5) is arranged inside the chassis (1), and the negative pressure mechanism (5) is communicated with the negative pressure cylinder (7), an anti-blocking mechanism (10) is arranged inside the negative pressure cylinder (7), a sieve box (8) is engaged with the inner wall of the negative pressure cylinder (7), a sieve net (9) is arranged at the bottom of the sieve box (8), a cover (29) is engaged and slidably connected to the top of the sieve box (8), a blowing assembly is arranged inside the cover (29), and an adjustment assembly is arranged above the chassis (1); The blowing assembly is used to blow air toward the inner wall of the negative pressure cylinder (7) and the bottom of the outer wall of the sealing cover (29); The adjusting component is used to drive the sealing cover (29) to move up and down.

2. A device and method for detecting cement fineness according to claim 1, characterized in that: The bottom outer edge of the sieve box (8) is provided with a groove (11) in the shape of a circular ring, the interior of the groove (11) is fixedly connected with a first sealing ring (12) whose shape matches that of the groove (11), and the first sealing ring (12) is configured as an elastic structure, the upper section of the inner wall of the negative pressure cylinder (7) is fixedly connected with a convex ring (13) in the shape of a circular ring, the top of the outer wall of the convex ring (13) is fixedly connected with a clamping column (14) whose shape matches that of the convex ring (13), and the top two side edges of the clamping column (14) are fixedly connected with extrusion blocks (15) whose shape matches that of the clamping column (14).

3. A device and method for detecting cement fineness according to claim 1, characterized in that: The blowing assembly comprises a rotating cylinder (31) inserted and rotatably connected to the middle of the outer wall of the sealing cover (29); a pair of upper and lower bearing members (35) are fixedly connected to the inner wall of the rotating cylinder (31); a fixed cylinder (34) is fixedly connected to the interior of the bearing member (35); the top of the outer wall of the fixed cylinder (34) extends out of the interior of the rotating cylinder (31); a plurality of circumferentially arranged connecting members (42) are fixedly connected to the bottom of the inner wall of the fixed cylinder (34); a baffle plate (39) is fixedly connected below the connecting member (42); an air pipe is inserted into the interior of the fixed cylinder (34); the other end of the air pipe is fixedly connected to an air supply mechanism (6); and the air supply mechanism (6) is arranged inside the chassis (1); a circular air hole (36) is opened at the bottom of the outer wall of the rotating cylinder (31); and a first air exhaust hole (40) is opened at the middle of the outer wall of the baffle plate (39).

4. A device and method for detecting cement fineness according to claim 3, characterized in that: A gear ring (30) is fixedly connected to the top of the outer wall of the rotating cylinder (31); a gear (27) is provided on one side of the gear ring (30), and the gear (27) meshes with the gear ring (30); a second transmission shaft (26) is inserted in the middle of the gear (27) and fixedly connected, and the bottom of the second transmission shaft (26) is inserted and rotatably connected to the top of the cover (29); a fixed frame (23) is fixedly connected to the top of the outer wall of the fixed cylinder (34), and the second transmission shaft (26) penetrates and is inserted in the top of the outer wall of the fixed frame (23) and is rotatably connected thereto; the cover (29) and the fixed frame (23) are connected to each other. A connecting rod (28) is fixedly connected between the fixing frame (23), a movable plate (24) is fixedly connected to the top of the fixing frame (23), a second motor (25) is fixedly connected to the bottom of the outer wall of the movable plate (24), and the output end of the second motor (25) is connected to the end of the second transmission shaft (26), both sides of the outer wall of the movable plate (24) are slidably connected to the same fixing frame (4), and the fixing frame (4) is fixedly connected to the top of the outer wall of the chassis (1), and a second arc-shaped air hole (38) is opened on one side of the bottom of the outer wall of the rotating cylinder (31), and the opening position of the second arc-shaped air hole (38) corresponds to the connecting piece (42).

5. A device and method for detecting cement fineness according to claim 3, characterized in that: A plurality of second exhaust holes (41) are provided at the bottom of the baffle plate (39) and form a circular array around the first exhaust hole (40); a first arc-shaped air hole (37) is provided at the bottom of the outer wall of the rotating cylinder (31); and the opening position of the first arc-shaped air hole (37) corresponds to the position of the second exhaust hole (41).

6. A device and method for detecting cement fineness according to claim 4, characterized in that: The adjustment mechanism comprises a first motor (16) fixedly connected to one side of the outer wall of the fixing frame (4); an output end of the first motor (16) is fixedly connected to a first transmission shaft (17), and the first transmission shaft (17) is inserted and rotatably connected to the top of the inner wall of the fixing frame (4); a positive and negative thread (19) is provided on the outer wall of the first transmission shaft (17); a pair of moving blocks (18) are screwed on the outer wall of the positive and negative thread (19); a pair of guide rods (20) are inserted and slidably connected to one side of the outer wall of the moving block (18), and the guide rods (20) are fixedly connected to the inner wall of the fixing frame (4); connecting rods (21) are inserted and rotatably connected to both sides of the outer wall of the moving block (18) through shafts; the other end of the connecting rod (21) is inserted and rotatably connected to a connecting block (22) through a shaft, and the connecting block (22) is fixedly connected to the top of the outer wall of the movable plate (24).

7. A device and method for detecting cement fineness according to claim 1, characterized in that: A second sealing ring (33) is sleeved on the outer wall of the cover (29), and a pair of observation windows (32) are provided on the top of the outer wall of the cover (29), and the observation windows (32) are made of transparent plastic.

8. A device and method for detecting cement fineness according to claim 1, characterized in that: The following steps are involved: S1. First, a sieve box (8) containing a cement test sample is placed inside the negative pressure cylinder (7) and pressed to fix the sieve box (8) inside the negative pressure cylinder (7). The first motor (16) is started by the controller (3). After the first motor (16) is powered on, it drives the first transmission shaft (17) to rotate rapidly, and finally drives the sealing cover (29) to move downward and snap into the interior of the sieve box (8), thereby sealing the sieve box (8); S2, sequentially starting the anti-blocking mechanism (10) and the negative pressure mechanism (5) through the controller (3), forming a negative pressure environment inside the negative pressure cylinder (7), and continuously vibrating the screen (9), thereby screening the cement test sample; S3, starting the second motor (25) and the air supply mechanism (6) in sequence through the controller (3), forming an air flow to blow toward the inside of the sieve box (8) and the bottom of the cover (29), and blowing up the cement test sample attached to the cover (29) and accumulated inside the sieve box (8); S4. During the execution of S2 and S3, S1 is executed, and the cover (29) slowly moves toward the inside of the sieve box (8), compressing the activity space of the cement test sample, thereby improving the screening efficiency.

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