Device and method for stabilizing standard consistency of building gypsum powder

Abstract

The present invention discloses a device and method for stabilizing the standard consistency of building gypsum powder, including: a feeder, a ball mill, a screening and detection device, and a controller arranged in sequence; the detection device is used to detect the proportion of the screen residue that fails to pass through a 30-mesh sieve in the overall gypsum powder and the proportion of fish-scale-shaped gypsum in the screen residue, and send the numerical values to the controller; when the proportion of fish-scale-shaped gypsum is higher than a preset threshold, the controller increases the feeding speed of the feeder and simultaneously reduces the rotation speed of the ball mill to reduce the proportion of fish-scale-shaped gypsum in the screen residue; when the proportion of the screen residue is higher than a preset threshold, the controller reduces the feeding speed of the feeder and simultaneously increases the rotation speed of the ball mill to reduce the proportion of the screen residue in the gypsum powder material. The present invention establishes a mechanical force dynamic balance system for grinding gypsum raw materials by a ball mill, and timely balances the lacking or excessive grinding mechanical force during the grinding process of the ball mill, so that the standard consistency of the ground gypsum powder tends to be stable.

Description

Technical Field

[0001] The invention relates to the technical field of gypsum board production, and in particular to a device and method for stabilizing the viscosity of building gypsum powder. Background Art

[0002] Building gypsum is one of the main raw materials for the production of gypsum board. After being modified and ground in a ball mill, building gypsum forms gypsum powder, which is used to prepare gypsum slurry. Its quality is the prerequisite for ensuring stable and smooth production. The important basis for judging the quality of gypsum powder is whether the standard viscosity is stable.

[0003] The standard consistency of gypsum powder is the amount of water used for standard consistency. It is the amount of water required to add 100 parts of hemihydrate gypsum powder to obtain standard fluidity. It is a very important indicator to measure the performance of gypsum powder.

[0004] After drying, desulfurized gypsum becomes β-hemihydrate gypsum, which needs to be put into a ball mill for grinding and modification. The grinding effect of the ball mill will affect the standard viscosity of the gypsum powder formed after grinding the β-hemihydrate gypsum.

[0005] In the actual production process, after the gypsum powder is ground in the ball mill and screened through a 30-mesh sieve, fish-scale gypsum components are found in the sieve residue. The formation of this fish-scale gypsum is due to the "excess mechanical external force" in the ball mill during the grinding process. On the one hand, the steel balls in the ball mill continuously refine the large particles, and on the other hand, the excessive impact force of the steel balls causes the fine powder to compress, stick to each other, agglomerate and clump.

[0006] Therefore, the proportion of fish-scale gypsum in the sieve residue can be used as a basis for judging the modified grinding condition of gypsum powder. In fact, the viscosity of gypsum powder after modified grinding also fluctuates with the amount of fish-scale gypsum in the sieve residue, thus affecting the stability of subsequent paper-faced gypsum board production. Summary of the Invention

[0007] The object of the present invention is to provide a device and method for stabilizing the standard viscosity of building gypsum powder, so as to solve the problem of large fluctuations in the standard viscosity of gypsum powder caused by the mismatch between the rotation speed of the ball mill and the input speed of the raw materials.

[0008] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0009] The present invention provides a device and method for stabilizing the standard viscosity of building gypsum powder, comprising: a feeder, a ball mill, a screening machine, a detection device, and a controller arranged in sequence;

[0010] The feeder is used to input gypsum raw materials into the inlet of the ball mill;

[0011] The ball mill is used to output gypsum powder to the screening machine;

[0012] The screening machine is used for screening gypsum powder materials, and the screened gypsum powder materials are transported to the detection device;

[0013] The detection device is used to detect the fractions of gypsum powder materials smaller than the target and larger than the target, so as to calculate the proportion of the sieve residue that fails to pass through the target sieve in the overall gypsum powder, and the proportion of fish-scale-shaped gypsum in the sieve residue, and send the values to the controller;

[0014] When the proportion of fish-scale-shaped gypsum is higher than the preset threshold, the controller increases the feeding speed of the feeder and simultaneously reduces the rotation speed of the ball mill, so as to reduce the proportion of fish-scale-shaped gypsum in the sieve residue;

[0015] When the proportion of the sieve residue is higher than the preset threshold, the controller reduces the feeding speed of the feeder and simultaneously increases the rotation speed of the ball mill, so as to reduce the proportion of the sieve residue in the gypsum powder materials.

[0016] As a preferred solution of the present invention, the detection device includes a first belt scale, a second belt scale, a third belt scale, a fourth belt scale and a centrifuge;

[0017] The screening machine includes two output ends. The first belt scale and the second belt scale are respectively arranged at the two output ends of the screening machine. After the gypsum powder materials are screened by the screening machine, the gypsum powder materials smaller than the target are output to the first belt scale, and after being weighed by the first belt scale, they are transported continuously. The gypsum powder materials larger than the target are output to the second belt scale, and after being weighed by the second belt scale, they are transported to the input end of the centrifuge;

[0018] The centrifuge includes two output ends located at its far and near positions respectively. The third belt scale and the fourth belt scale are respectively arranged at the two output ends of the centrifuge. The centrifuge rotates at a constant speed and throws the sieve residue that fails to pass through the screening of the screening machine to its outer side; the surface of the fish-scale-shaped gypsum is rough, so that under the action of the sliding resistance, it is thrown to the nearer output end of the centrifuge and falls into the input end of the third belt scale, and after being weighed by the third belt scale, it is transported to the subsequent equipment;

[0019] The surface of the ordinary sieve residue gypsum is smooth, so that under the action of the sliding resistance, it is thrown to the farther output end of the centrifuge and falls into the input end of the fourth belt scale, and after being weighed by the fourth belt scale, it is transported continuously;

[0020] The weighing data of the first belt scale, the second belt scale, the third belt scale, and the fourth belt scale are all transmitted to the controller, and the controller analyzes the proportion of the screened residue in the gypsum powder and the proportion of the scaly gypsum in the screened residue.

[0021] As a preferred embodiment of the present invention, the transportation rates of the first belt scale and the second belt scale are the same, and the transportation rates of the third belt scale and the fourth belt scale are the same.

[0022] As a preferred embodiment of the present invention, an aggregate hopper is provided at the output end of the second belt scale, a columnar channel is provided at the bottom of the aggregate hopper, and the bottom of the columnar channel is connected to the input end of the centrifuge.

[0023] As a preferred embodiment of the present invention, the centrifuge includes a separation disk and a motor. The separation disk is driven by the motor to rotate around its own axis. The axis of the separation disk is vertically arranged, and the horizontal height of the edge of the surface of the separation disk is lower than the horizontal height of its own center, so that the edge of the centrifuge is slightly inclined downward, and its overall shape is conical.

[0024] As a preferred embodiment of the present invention, an annular partition wall is provided outside the separation disk. The partition wall forms a first separation chamber and a second separation chamber outside the separation disk. The first separation chamber is close to the separation disk, and the second separation chamber is far from the separation disk;

[0025] The top annular region of the first separation chamber is within the throwing range of the scaly gypsum, and the top annular region of the second separation chamber is within the throwing range of the ordinary screened residue gypsum;

[0026] The bottom of the first separation chamber is connected to the input end of the third belt scale, and the bottom of the second separation chamber is connected to the input end of the fourth belt scale.

[0027] As a preferred embodiment of the present invention, the bottoms of both the first separation chamber and the second separation chamber are inclined to one side, and a pipeline is provided at the bottom end in the inclined direction to connect the input ends of the third belt scale and the fourth belt scale.

[0028] As a preferred embodiment of the present invention, the top height of the partition wall is lower than the edge height of the separation disk, and the top of the outer wall of the second separation chamber is higher than the top height of the partition wall.

[0029] As a preferred embodiment of the present invention, an arc-shaped chamfer is provided at the top of the partition wall.

[0030] In the second aspect of the present invention, a method for stabilizing the normal consistency of building gypsum powder is provided. Using the above device for stabilizing the normal consistency of building gypsum powder, the method includes the following steps:

[0031] Step 1, analyze the relationship between the proportion of flaky gypsum in the gypsum powder material and the normal consistency of the gypsum powder material, and obtain the proportion of flaky gypsum when the normal consistency of the gypsum powder material meets the usage requirements;

[0032] Step 2, grind the gypsum using a ball mill to obtain gypsum powder material;

[0033] Step 3, screen the gypsum powder material, and at the same time detect the proportion of the screen residue that does not pass through a 30-mesh sieve in the overall gypsum powder, and the proportion of flaky gypsum in the screen residue;

[0034] Step 4a, when the proportion of flaky gypsum is higher than a preset threshold, increase the feeding speed and decrease the rotation speed of the ball mill to reduce the proportion of flaky gypsum in the screen residue;

[0035] Step 4b, when the proportion of the screen residue is higher than a preset threshold, decrease the feeding speed and increase the rotation speed of the ball mill to reduce the proportion of the screen residue in the gypsum powder material.

[0036] The present invention has the following beneficial effects compared with the prior art:

[0037] By setting a feeder, a ball mill, a screening machine, and a detection device, and establishing a mechanical force dynamic balance system for grinding gypsum raw materials by the ball mill with the help of a controller, the present invention controls the feeding rate of the feeder and the rotation speed of the ball mill by detecting the proportion of the screen residue after the gypsum powder material ground by the ball mill passes through a 30-mesh sieve of the screening machine and the proportion of flaky gypsum in the screen residue in real time. After the proportion of the screen residue is higher than the preset value, the feeding rate of the feeder is decreased and the rotation speed of the ball mill is increased. After the proportion of flaky gypsum is higher than the preset value, the feeding rate of the feeder is increased and the rotation speed of the ball mill is decreased, timely balancing the lacking or excessive grinding mechanical force during the grinding process of the ball mill, so that the normal consistency of the ground gypsum powder material tends to be stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained according to the provided drawings.

[0039] Figure 1 It is the overall architecture diagram of the present invention;

[0040] Figure 2 External perspective view of the separation disc of the present invention and its housing;

[0041] Figure 3 Front sectional view of the separation disc of the present invention and its housing;

[0042] The reference numerals in the figure respectively represent the following:

[0043] 1 - Feeder, 2 - Ball mill, 3 - Screening machine, 4 - Detection device, 41 - First belt scale, 42 - Second belt scale, 43 - Third belt scale, 44 - Fourth belt scale, 45 - Centrifugal separator, 451 - Separation disc, 452 - Motor, 46 - Partition wall, 47 - First separation chamber, 48 - Second separation chamber, 5 - Controller, 6 - Aggregate hopper, 7 - Columnar channel. Specific embodiments

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0045] As shown in Figure 1 、 2 、3, the present invention provides a device and method for stabilizing the standard consistency of building gypsum powder, including: a feeder 1, a ball mill 2, a screening machine 3, a detection device 4, and a controller 5 arranged in sequence; the feeder 1 is used to input gypsum raw materials into the feeding port of the ball mill 2; the ball mill 2 is used to output gypsum powder to the screening machine 3; the screening machine 3 is used to screen the gypsum powder, and the screened gypsum powder is transmitted to the detection device 4; the detection device 4 is used to detect the fractions of gypsum powder less than 30 mesh and greater than 30 mesh to calculate the proportion of the screen residue that does not pass through the 30 - mesh sieve in the overall gypsum powder, as well as the proportion of fish - scale - shaped gypsum in the screen residue, and send the values to the controller 5; when the proportion of fish - scale - shaped gypsum is higher than the preset threshold, the controller 5 increases the feeding speed of the feeder 1 and at the same time decreases the rotation speed of the ball mill 2 to reduce the proportion of fish - scale - shaped gypsum in the screen residue; when the proportion of the screen residue is higher than the preset threshold, the controller 5 decreases the feeding speed of the feeder 1 and at the same time increases the rotation speed of the ball mill 2 to reduce the proportion of the screen residue in the gypsum powder.

[0046] The above - mentioned solution is used to establish a mechanical force balance system during the grinding of gypsum raw materials by the ball mill 2. Among them, the feeder 1 can be a common conveyor - type feeding device or a screw - type feeding device, and the feeding speed needs to be adjustable. The ball mill 2 is a common steel - ball ball mill 2 with adjustable rotation speed, and the screening machine 3 can be a common screening device such as a vibrating screen or a rotary screen.

[0047] In the above solution, the formation of the scaly gypsum is due to the excessive mechanical force of the ball mill 2 causing excessive grinding of the gypsum raw material. Knowing the proportion of the scaly gypsum in the screen residue can reflect the degree of excessive mechanical force of the ball mill 2 from the side. When the mechanical force of the ball mill 2 is severely excessive, it will affect the standard consistency of the gypsum powder after grinding. Therefore, an upper limit value of the proportion of the scaly gypsum in the screen residue can be preset. When the proportion of the scaly gypsum exceeds this value, it indicates that the grinding mechanical force of the ball mill 2 is severely excessive at this time, and it is necessary to reduce or offset part of the mechanical force to balance so that the ball mill 2 can perform standard operations.

[0048] To reduce the mechanical force of the ball mill 2 during grinding, the speed of the ball mill 2 can be reduced. To offset and balance the excessive mechanical force of the ball mill 2, the gypsum raw material inside the ball mill 2 can be increased, that is, the feeding speed of the feeder 1 is increased.

[0049] Under the dual action of reducing the speed of the ball mill 2 and increasing the feeding speed of the feeder 1, the excessive grinding mechanical force of the ball mill can be quickly balanced. However, if the action time is long, it will lead to insufficient grinding mechanical force of the ball mill 2, that is, insufficient grinding. It is manifested as an increase in the proportion of the screen residue that cannot pass through the 330-mesh sieve in the overall gypsum powder output by the ball mill 2. At this time, reverse adjustment can be carried out to increase the grinding mechanical force of the ball mill 2, that is, increase the speed of the ball mill 2 and reduce the feeding rate of the feeder 1.

[0050] Through the detection device 4 in the solution, continuously detect the proportion of the screen residue that does not pass through the 30-mesh sieve in the overall gypsum powder and the proportion of the scaly gypsum in the screen residue, and through the controller 5, repeatedly cycle the control and regulation as described above, so that the proportion of the screen residue in the overall gypsum powder and the proportion of the scaly gypsum in the screen residue are stabilized within the preset range, so that the grinding mechanical force of the ball mill 2 on the gypsum raw material inside it is controlled within a reasonable range, and then the standard consistency of the gypsum powder after grinding and screening is stabilized.

[0051] Regarding how the detection device 4 detects the proportion of the screen residue in the overall gypsum powder and the proportion of the scaly gypsum in the screen residue, the following solution can be adopted;

[0052] Furthermore, the detection device 4 includes a first belt scale 41, a second belt scale 42, a third belt scale 43, a fourth belt scale 44, and a centrifuge 45;

[0053] The screening machine 3 includes two output ends. The first belt scale 41 and the second belt scale 42 are respectively arranged at the two output ends of the screening machine 3. After the screening machine 3 screens the gypsum powder, the gypsum powder smaller than 30 mesh is output to the first belt scale 41, and is continuously transported after being weighed by the first belt scale 41. The gypsum powder larger than 30 mesh is output to the second belt scale 42, and is transported to the input end of the centrifugal separator 45 after being weighed by the second belt scale 42;

[0054] The centrifugal separator 45 includes two output ends located at its far and near positions respectively. The third belt scale 43 and the fourth belt scale 44 are respectively arranged at the two output ends of the centrifugal separator 45. The centrifugal separator 45 rotates at a constant speed and throws the screening residue that has not passed through the screening of the screening machine 3 to its outside; the surface of the fish-scale gypsum is rough, so that under the action of the sliding resistance, it is projected to the nearer output end of the centrifugal separator 45 and falls into the input end of the third belt scale 43, and is transported to the subsequent equipment after being weighed by the third belt scale 43;

[0055] The surface of the ordinary screening residue gypsum is smooth, so that under the action of the sliding resistance, it is projected to the farther output end of the centrifugal separator 45 and falls into the input end of the fourth belt scale 44, and is continuously transported after being weighed by the fourth belt scale 44;

[0056] The weighing data of the first belt scale 41, the second belt scale 42, the third belt scale 43 and the fourth belt scale 44 are all transmitted to the controller 5, and the controller 5 analyzes the proportion of the screening residue in the gypsum powder and the proportion of the fish-scale gypsum in the screening residue.

[0057] In the above solution, the separation disc 451 is driven by the motor 452 at its bottom, and the overall detection principle of its detection device 4 is as follows:

[0058] On the one hand, the gypsum powder passing through the 330-mesh sieve of the screening machine 3 is conveyed to the surface of the first belt scale 41. Due to the continuous conveying action of the first belt scale 41, the mass of the gypsum powder on its surface is in a dynamic change process. Similarly, the screening residue of the gypsum powder that has not passed through the 30-mesh sieve is conveyed to the second belt scale 42. Due to the continuous conveying action of the second belt scale 42, the mass of the screening residue on its surface is also in a dynamic change process. The sum of the mass of the gypsum powder falling on the surface of the first belt scale 41 and the mass of the screening residue on the surface of the second belt scale 42 at the same time is the total mass of the gypsum powder input into the screening machine 3 at a previous time. Therefore, the controller 5 divides the mass data of the second belt scale 42 at a certain time by the sum of the mass data of the first belt scale 41 and the second belt scale 42, and can obtain the proportion value of the screening residue in the gypsum powder input into the screening machine 3 at a previous time. By continuous measurement, a fluctuation curve of the mass proportion of the screening residue in the gypsum powder output by the ball mill 2 can be obtained. Furthermore, the controller 5 can compare the change data of the screening residue proportion with the system preset value for corresponding feedback control.

[0059] On the other hand, the screened gypsum powder is conveyed to the surface of the separation disk 451 through the second belt scale 42. The uniform rotation of the separation disk 451 will give the screened particles on its surface a 'centrifugal force' towards the outside of the separation disk 451. Due to the rough surface of the flaky gypsum in the screened material, after being ejected from the edge of the separation disk 451, the ejection distance is relatively short. While the ordinary gypsum powder particles in the screened material are approximately spherical and have a relatively small frictional force with the surface of the separation disk 451. After moving to the edge of the separation disk 451, their speed is relatively fast and the ejection distance is relatively far. Thus, the two are distinguished;

[0060] At this time, the flaky gypsum with a shorter ejection distance falls into the third belt scale 43, and the ordinary screened gypsum with a longer ejection distance falls into the fourth belt scale 44. At the same time, due to the continuous conveying action of the third belt scale 43 and the fourth belt scale 44, there will be a dynamic change value in the mass of the corresponding gypsum powder on their surfaces. And the sum of the mass data on the surfaces of the third belt scale 43 and the fourth belt scale 44 at a certain moment is the total mass of the screened material that fell onto the surface of the separation disk 451 at the previous moment. Therefore, by dividing the mass data on the surface of the third belt scale 43 at a certain moment by the sum of the mass data on the surfaces of the third belt scale 43 and the fourth belt scale 44 at this moment, the proportion of the mass of the flaky gypsum at this moment in the total mass of the screened material in the previous moment can be obtained. The controller 5 can repeatedly measure and compare with the preset value, and then feedback control the relevant equipment.

[0061] At the same time, it should be noted that it is necessary to control the transportation speeds of the first belt scale 41 and the second belt scale 42 to be the same, and the transportation speeds of the third belt scale 43 and the fourth belt scale 44 to be the same, so as to avoid the difference in the consumption speed of the gypsum powder falling onto the surfaces of the first belt scale 41 and the second belt scale 42 or the third belt scale 43 and the fourth belt scale 44 within the same time period due to the deviation of the belt scale transportation speed, and thus avoid the measurement deviation caused by the mass fluctuation.

[0062] The present invention separates the flaky gypsum and the ordinary gypsum in the screened material through the ejection action of the separation disk 451. The gypsum powder particles need an acceleration process to be ejected around by the separation disk 451. Therefore, the screened gypsum conveyed out from the second belt scale should preferably fall into the central position of the separation disk 451;

[0063] Therefore, further, a collecting hopper 6 is provided at the output end of the second belt scale 42. A columnar channel 7 is provided at the bottom of the collecting hopper 6, and the bottom of the columnar channel 7 is connected to the input end of the centrifugal separator 45

[0064] In addition, considering that the particles of the ordinary screen residue are approximately spherical and conducive to rolling, while the flaky gypsum is relatively flat and not conducive to rolling, further, the centrifugal separator 45 includes a separation disk 451 and a motor 452. The separation disk 451 is driven by the motor 452 to rotate around its own axis. The axis of the separation disk 451 is vertically arranged, and the horizontal height of the edge of the surface of the separation disk 451 is lower than the horizontal height of its own center, so that the edge of the centrifugal separator 45 is slightly inclined downward, and its overall shape is conical.

[0065] In this way, the particles of the ordinary screen residue can have a greater initial velocity when being projected from the edge of the separation disk 451 under the acceleration of the component force of gravity along the inclined direction of the separation disk 451, thereby enhancing the separation effect between the flaky gypsum and the ordinary gypsum particles. Considering that the flaky gypsum and the ordinary gypsum powder projected to different distances need specific structural separation and collection and transportation to the surfaces of the third belt scale 43 and the fourth belt scale 44, further, an annular partition wall 46 is provided outside the separation disk 451. The partition wall 46 forms a first separation chamber 47 and a second separation chamber 48 outside the separation disk 451, where the first separation chamber 47 is close to the separation disk 451 and the second separation chamber 48 is far from the separation disk 451;

[0066] The top annular region of the first separation chamber 47 is within the projection range of the flaky gypsum, and the top annular region of the second separation chamber 48 is within the projection range of the ordinary screen residue gypsum;

[0067] The bottom of the first separation chamber 47 is connected to the input end of the third belt scale 43, and the bottom of the second separation chamber 48 is connected to the input end of the fourth belt scale 44.

[0068] Further, the bottoms of both the first separation chamber 47 and the second separation chamber 48 are inclined to one side, and a pipeline is provided at the bottom end in the inclined direction to connect to the input ends of the third belt scale 43 and the fourth belt scale 44. Through the guiding action of the inclination of the bottoms of the first separation chamber 47 and the second separation chamber 48, the gypsum powder falling into their bottoms will slide to the inclined side under the action of its own gravity, and then fall onto the surfaces of the third belt scale 43 or the fourth belt scale 44 through the pipeline on the inclined side.

[0069] On the other hand, the gypsum material projected from the edge of the separation disk 451 moves in a parabolic motion. Therefore, the top height of the partition wall 46 needs to be lower than the edge height of the separation disk 451 to avoid blocking the projected gypsum material, so that the ordinary gypsum powder cannot cross the partition wall 46 and interfere with the separation effect. On the other hand, the top of the outer wall of the second separation chamber 48 is higher than the top height of the partition wall 46, thereby avoiding the gypsum powder being projected too far and causing pollution outside the second separation chamber 48.

[0070] In addition, in order to prevent the accumulation of gypsum powder particles at the top of the partition wall 46, an arc-shaped chamfer is provided at the top of the partition wall 46, so that the gypsum powder staying here slides into the first separation chamber 47 or the second separation chamber 48 on the side.

[0071] In the second aspect of the present invention, a method for stabilizing the standard consistency of building gypsum powder is provided. Using the above device for stabilizing the standard consistency of building gypsum powder, the method includes the following steps:

[0072] Step 1: Analyze the relationship between the proportion of flaky gypsum in the gypsum powder and the standard consistency of the gypsum powder, and obtain the proportion of flaky gypsum when the standard consistency of the gypsum powder meets the usage requirements.

[0073] Step 2: Grind the gypsum using the ball mill 2 to obtain gypsum powder.

[0074] Step 3: Screen the gypsum powder, and at the same time, detect the proportion of the screen residue that does not pass through the 30-mesh sieve in the overall gypsum powder, and the proportion of flaky gypsum in the screen residue.

[0075] Step 4a: When the proportion of flaky gypsum is higher than the preset threshold, increase the feeding speed and decrease the rotation speed of the ball mill 2 to reduce the proportion of flaky gypsum in the screen residue.

[0076] Step 4b: When the proportion of the screen residue is higher than the preset threshold, decrease the feeding speed and increase the rotation speed of the ball mill 2 to reduce the proportion of the screen residue in the gypsum powder.

[0077] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application. The protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements within the essence and protection scope of the present application, and such modifications or equivalent replacements should also be regarded as falling within the protection scope of the present application.

Claims

1. A device for stabilizing the standard consistency of building gypsum powder, characterized in that: It includes a feeder (1), a ball mill (2), a screening machine (3), a detection device (4), and a controller (5) arranged in sequence; The feeder (1) is used to input gypsum raw materials into the feeding port of the ball mill (2); The ball mill (2) is used to output gypsum powder to the screening machine (3); The screening machine (3) is used to screen gypsum powder, and the screened gypsum powder is transported to the detection device (4); The detection device (4) is used to detect the fractions of gypsum powder smaller than 30 mesh and larger than 30 mesh, calculate the proportion of the screen residue that does not pass through the 30-mesh sieve in the overall gypsum powder, and the proportion of scaly gypsum in the screen residue, and send the values to the controller (5); When the proportion of scaly gypsum is higher than the preset threshold, the controller (5) increases the feeding speed of the feeder (1) and simultaneously reduces the rotation speed of the ball mill (2) to reduce the proportion of scaly gypsum in the screen residue; When the proportion of the screen residue is higher than the preset threshold, the controller (5) reduces the feeding speed of the feeder (1) and simultaneously increases the rotation speed of the ball mill (2) to reduce the proportion of the screen residue in the gypsum powder.

2. The device for stabilizing the standard consistency of building gypsum powder according to claim 1, characterized in that: The detection device (4) includes a first belt scale (41), a second belt scale (42), a third belt scale (43), a fourth belt scale (44), and a centrifugal separator (45); The screening machine (3) includes two output ends. The first belt scale (41) and the second belt scale (42) are respectively arranged at the two output ends of the screening machine (3). After the screening of the gypsum powder by the screening machine (3), the gypsum powder smaller than 30 mesh is output to the first belt scale (41), weighed by the first belt scale (41) and then transported continuously. The gypsum powder larger than 30 mesh is output to the second belt scale (42), weighed by the second belt scale (42) and then transported to the input end of the centrifugal separator (45); The centrifugal separator (45) includes two output ends located at its far and near positions respectively. The third belt scale (43) and the fourth belt scale (44) are respectively arranged at the two output ends of the centrifugal separator (45). The centrifugal separator (45) rotates at a constant speed and throws the screen residue that does not pass through the screening of the screening machine (3) to its outer side; the rough surface of the scaly gypsum causes it to be thrown to the nearer output end of the centrifugal separator (45) under the action of sliding resistance and fall into the input end of the third belt scale (43), weighed by the third belt scale (43) and then transported to the subsequent equipment; The surface of the ordinary screen residue gypsum is smooth, so that it is thrown to the farther output end of the centrifugal separator (45) under the action of sliding resistance and falls into the input end of the fourth belt scale (44), weighed by the fourth belt scale (44) and then transported continuously; The weighing data of the first belt scale (41), the second belt scale (42), the third belt scale (43) and the fourth belt scale (44) are all transmitted to the controller (5), and the controller (5) analyzes the proportion of the screened residue in the gypsum powder and the proportion of the scaly gypsum in the screened residue.

3. The device for stabilizing the standard consistency of building gypsum powder according to claim 2, characterized in that: The first belt scale (41) and the second belt scale (42) have the same transportation rate, and the third belt scale (43) and the fourth belt scale (44) have the same transportation rate.

4. The device for stabilizing the standard consistency of building gypsum powder according to claim 3, characterized in that: The output end of the second belt scale (42) is provided with an aggregate hopper (6), the bottom of the aggregate hopper (6) is provided with a columnar channel (7), and the bottom of the columnar channel (7) is connected to the input end of the centrifuge (45).

5. The device for stabilizing the standard consistency of building gypsum powder according to claim 4, characterized in that: The centrifuge (45) includes a separation disc (451) and a motor (452), the separation disc (451) is driven by the motor (452) to rotate around its own axis, the axis of the separation disc (451) is vertically arranged, and the horizontal height of the edge of the surface of the separation disc (451) is lower than the horizontal height of its own center, so that the edge of the centrifuge (45) is slightly inclined downward, and its whole is conical.

6. The device for stabilizing the standard consistency of building gypsum powder according to claim 5, characterized in that: An annular partition wall (46) is arranged outside the separation disc (451), and the annular partition wall (46) forms a first separation chamber (47) and a second separation chamber (48) outside the separation disc (451), wherein the first separation chamber (47) is close to the separation disc (451), and the second separation chamber (48) is far from the separation disc (451); The top annular area of the first separation chamber (47) is within the throwing range of the scaly gypsum, and the top annular area of the second separation chamber (48) is within the throwing range of the ordinary screened residue gypsum; The bottom of the first separation chamber (47) is communicated with the input end of the third belt scale (43), and the bottom of the second separation chamber (48) is communicated with the input end of the fourth belt scale (44).

7. The device for stabilizing the standard consistency of building gypsum powder according to claim 6, characterized in that: The bottoms of the first separation chamber (47) and the second separation chamber (48) are both inclined to one side, and a pipeline is provided at the bottom end in the inclined direction to communicate with the input ends of the third belt scale (43) and the fourth belt scale (44).

8. The device for stabilizing the standard consistency of building gypsum powder according to claim 7, characterized in that: The top height of the partition wall (46) is lower than the edge height of the separation disc (451), and the top of the outer wall of the second separation chamber (48) is higher than the top height of the partition wall (46).

9. A device for stabilizing the normal consistency of building gypsum powder according to claim 8, characterized in that: The top of the partition wall (46) is provided with an arc-shaped chamfer.

10. A method for stabilizing the normal consistency of building gypsum powder, characterized in that, A device for stabilizing the normal consistency of building gypsum powder according to any one of claims 1-9, comprising the following steps: Step 1, analyze the correlation between the proportion of flaky gypsum in the gypsum powder material and the normal consistency of the gypsum powder material, and obtain the proportion of flaky gypsum when the normal consistency of the gypsum powder material meets the use requirements; Step 2, grind the gypsum using a ball mill to obtain gypsum powder material; Step 3, screen the gypsum powder material, and at the same time detect the proportion of the screen residue that does not pass through a 30-mesh sieve in the overall gypsum powder, and the proportion of flaky gypsum in the screen residue; Step 4a, when the proportion of flaky gypsum is higher than a preset threshold, increase the feeding speed and at the same time reduce the rotation speed of the ball mill so that the proportion of flaky gypsum in the screen residue is reduced; Step 4b, when the proportion of the screen residue is higher than a preset threshold, reduce the feeding speed and at the same time increase the rotation speed of the ball mill so that the proportion of the screen residue in the gypsum powder material is reduced.

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