CN109902364B - Method for improving uniformity of spray-grouting felt making - Google Patents
Method for improving uniformity of spray-grouting felt making Download PDFInfo
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Abstract
The invention belongs to the technical field of heat preservation felt production, and particularly relates to a method for improving uniformity of guniting felt making, which comprises the following steps: step 1, obtaining a relation equation of radius and thickness distribution in concentric circle plaque sprayed by actual slurry; step 2, generating a filter screen interface; step 3, generating a simulated concentric circular plaque on the filter screen interface according to the relation equation in the step 1; step 4, the concentric circles of plaques move on the filter screen interface according to a set movement rule; step 5, after the movement is completed, counting the accumulated thickness of the felt formed on the filter screen interface, and evaluating the thickness distribution uniformity of the felt; step 6, changing the setting parameters of the movement rule in the step 4, and repeating the steps 4 and 5 to obtain the movement rule of the atomizer for manufacturing the felt with good uniformity; the invention realizes the organic superposition and mutual compensation of multilayer spraying, obtains the felt body with good uniformity, and guides the production of the felt body.
Description
Technical Field
The invention belongs to the technical field of heat preservation felt production, and particularly relates to a method for improving uniformity of guniting felt making.
Background
The heat preservation felt is used as common heat preservation and insulation equipment, and is favored by more and more factory enterprises by virtue of good heat preservation performance and wide application fields. The heat preservation felt has the characteristics of light material, good heat preservation effect, simple and convenient construction, repeated use, small production investment and quick effect, and can reduce a large amount of energy consumption in the actual use process, so the heat preservation felt has very broad development prospect. At present, the global heat-insulating material is developing towards the integration of high efficiency, energy saving, thin layer, heat insulation and waterproof outer protection, and the heat-insulating material is used with higher emphasis on the targeted use of the heat-insulating material while developing the novel heat-insulating material and conforming to the heat-insulating and energy-saving technology of the structure, and is designed and constructed according to the standard specification, so as to improve the heat-insulating efficiency and reduce the cost. The heat-insulating felt is made of fibre slurry, and its production process mainly includes pulping, spray-forming and drying. Among them, the spray forming is one of the key factors for ensuring the quality of the insulation blanket, and the main objective of the spray forming is to uniformly spray the fiber slurry onto the filter screen film so as to ensure the uniformity of the insulation blanket.
At present, a pressure atomization technology is generally adopted by the spray nozzle, namely, the slurry enters an atomizer for atomization under the action of pressure, and as the spray droplet flow field sprayed by the spray nozzle is a conical flow field, the slurry plaque formed by the flow field on a plane filter screen film is a circular plane. Due to the non-uniformity of the slurry sprayed by the atomizer, the plane is typically a concentric circle of non-uniform thickness. The manufacturing process of the heat preservation felt is formed by spraying and coating the cover for multiple times, and on the premise of multi-layer coverage, how to control the coverage mechanism according to the non-uniformity of concentric circles, namely, the displacement rule of the spray head in the x direction and the y direction is adjusted, so that the organic superposition and mutual compensation of multiple layers are realized, the uniformity of the heat preservation felt is realized, and the heat preservation felt is a key technology for manufacturing the heat preservation felt. Because the covering process involves complicated factors such as thickness distribution of concentric circles, moving speed in x and y directions, how to find the optimal moving rule to meet the requirement of felt on uniformity is a difficulty faced at present,
disclosure of Invention
The invention solves the technical problems in the prior art and provides a method for improving the uniformity of slurry spraying and felt making.
In order to solve the problems, the technical scheme of the invention is as follows:
a method of improving the uniformity of a slurry-making mat comprising the steps of:
step 1, obtaining a relation equation of radius and thickness distribution in concentric circle plaque sprayed by actual slurry;
step 2, generating a filter screen interface;
step 3, generating a simulated concentric circular plaque on the filter screen interface according to the relation equation in the step 1;
step 4, the concentric circles of plaques move on the filter screen interface according to a set movement rule;
step 5, after the movement is completed, counting the accumulated thickness of the felt formed on the filter screen interface, and evaluating the thickness distribution uniformity of the felt;
and 6, changing the setting parameters of the movement law in the step 4, and repeating the steps 4 and 5 to obtain the movement law of the atomizer for manufacturing the felt body with uniform thickness distribution.
Preferably, the relation equation in step 1 is obtained by measuring the actual distribution of radius and thickness in concentric circles of plaque.
Preferably, the fitting method in step 1 is as follows: spraying slurry onto a plane filter screen at a fixed position by an atomizer to obtain slurry concentric circle plaques, measuring the average thickness of the circles plaques at different radiuses to obtain the data of the radius of the circles plaques and the thickness distribution of the slurry, and fitting a relation equation of the radius and the thickness distribution in the concentric circles plaques through the data.
Preferably, in the step 2, the screen interface is meshed, coordinates of each mesh are calibrated and numbered.
Preferably, in the step 3, a position coordinate of initial spraying is set on the screen interface, a distance between each grid of the screen interface and the initial spraying position is measured, a digital mark is added to the grids within the simulated concentric circular plaque range, and the digital mark represents the thickness of the concentric circular plaque at the grid position.
Preferably, in the step 4, the setting parameters of the movement rule include a speed movement and a movement track.
Preferably, in the step 4, a digital mark is added to the grid covered when the simulated concentric circles plaque moves; when concentric circular spots at different moments cover the same grid, the digital marks on the grid are accumulated.
Preferably, in the step 5, after the movement is completed, the numerical mark value in each grid of the filter screen is counted and converted into the thickness distribution condition of the felt body on the filter screen.
Preferably, in the step 5, the uniformity of the thickness distribution of the felt is evaluated by measuring and calculating the variance of the uniformity of the thickness distribution of the felt, so as to obtain the uniformity of the felt manufactured under the movement rule; generally, a felt having an average thickness of 1cm is considered to be a uniform felt when its uniformity variance is less than 0.05.
The advantages of the present invention over the prior art are as follows,
according to the invention, a numerical simulation method is utilized, according to a thickness distribution equation of concentric circular spots sprayed by an atomizer, the displacement rule of a spray head is adjusted by controlling a covering mechanism, so that organic superposition and mutual compensation of multilayer spraying are realized, a felt with good uniformity is obtained, and the production of the felt is guided;
the method for improving the uniformity of the guniting felting provided by the invention has the advantages that theoretical simulation data are compared with the felt uniformity data obtained by the actual guniting felting method, the relative error is within 6%, and a basis is provided for guiding the actual production operation of the guniting felting.
Drawings
FIG. 1 is a graph showing the thickness distribution of concentric circular spots obtained by spraying slurry with an atomizer, and simulated circular spots are generated on a mesh-divided filter screen;
FIG. 2 is a view showing the formation of a felt during movement of a circular spot;
fig. 3 shows a felt with good uniformity obtained by varying the movement law.
Detailed Description
Example 1:
providing a relation equation of radius and thickness distribution in concentric circular spots obtained by spraying slurry by an atomizer, programming the program of the method and completing parameter setting, namely simulating the atomizer to move at a certain speed to manufacture a felt thickness distribution curve, and measuring and calculating felt uniformity. The specific route is as follows:
(1) Measuring a relation between concentric circle thickness and radius distribution of spraying slurry on a filter screen film according to a used slurry spraying nozzle;
(2) Dividing the filter screen surface into grids according to the required felting size, calibrating coordinates of each grid and numbering;
(3) Setting position coordinates of initial spraying on a filter screen, measuring and calculating the distance between each grid of the filter screen and the initial spraying position, and adding a digital mark for the grids in the concentric circle range according to the relation between the radius of the concentric circle sprayed by the slurry and the thickness distribution, wherein the digital mark represents the thickness condition of concentric circle spots on the grid positions;
(4) The concentric circles of spots move at a set speed, representing the movement of the atomizer during spraying, and adding a digital mark to the grid covered during movement. When concentric circular spots at different moments cover the same grid, the digital marks on the grid are accumulated;
(5) After the movement is completed, counting the number mark values in each grid of the filter screen, and converting the number mark values into thickness distribution conditions of felt bodies on the filter screen according to the number mark values;
(6) And measuring and calculating the uniformity variance of the thickness distribution of the felt body. Thereby obtaining the uniformity of the felt body manufactured under the movement rule; generally, a felt having an average thickness of 1cm is considered to be a uniform felt when its uniformity variance is less than 0.05.
(7) And obtaining the movement rule of the atomizer for manufacturing the felt with good uniformity through continuous felt making simulation tests.
Example 2:
step 1: selecting a pressure cyclone atomizer with an atomization angle of 30 degrees, fixedly spraying the pressure cyclone atomizer at a height of 30 cm away from a filter screen to obtain slurry concentric circular plaques, measuring the average thickness of the circular plaques at different radiuses to obtain data of the radius of the circular plaques and the thickness distribution of the slurry, and fitting the data to the relation equation of the radius and the thickness distribution in the central circular plaques by using the data: h=4e-05 r 4 -0.0021r 3 +0.022r 2 +0.0072+0.4456, circular spot radius 18 cm, equation fitting degree 0.9967.
Step 2: a program is written according to the method. Inputting the radius and thickness distribution equation of the circular spots obtained in the step 1 into a program, and setting the initial size, length and width of the filter screen to 5000mm; calculating the step length to be 0.1s, and calculating the total time until the felt body is fully paved with the filter screen frame body; the initial position coordinates of the spray head on the x axis and the y axis are 600 and 600 respectively. Each felting simulation uniformly produced a felt body with an average thickness of 1 cm.
Step 3: the effect of the x-direction movement speed of the atomizer on the uniformity of the felt was tested. When the moving speed of the atomizer in the x direction is 0.12m/s, the variance of the uniformity of the felt body is 0.171245, and when the moving speed is reduced from 0.12m/s to 0.06m/s, the uniformity of the felt body is greatly improved, and when the speed of the atomizer is reduced by 0.01m/s, the variance of the uniformity of the felt body can be reduced by 0.02624; when the transverse moving speed of the atomizer is smaller than 0.06m/s, the uniformity variance of the felt body can be reduced 0.00273 when the transverse moving speed of the atomizer is reduced by 0.01 m/s. When the moving speed is 0.07m/s, the uniformity variance of the felt body is 0.04418, and the uniformity requirement of the felt body is met.
Step 4: the effect of the atomizer y-direction travel distance on the uniformity of the mat was tested. When the y-direction moving distance of atomization is 1r (namely one-time radius length), the uniformity variance of the felt body is 0.38582, and when the y-direction moving distance is reduced from 1r to 0.6r, the average moving distance per reduction of 0.1r is reduced, and the uniformity variance of the felt body can be reduced by 0.06273; when the movement distance of the atomizer in the y direction is less than 0.06m/s, the uniformity variance of the felt can be reduced 0.01024 for each reduction of the movement distance of the atomizer by 0.1 r. When the moving distance of the atomizer in the y direction is 0.3r, the uniformity variance of the felt is 0.049941927, and the uniformity requirement of the felt is met.
It should be noted that the above-mentioned embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and the equivalents or alternatives made on the basis of the above description are all included in the scope of the present invention.
Claims (4)
1. A method of improving the uniformity of a slurry-making mat comprising the steps of:
step 1, obtaining a relation equation of radius and thickness distribution in concentric circle plaque sprayed by actual slurry; the relation equation is obtained by measuring the actual distribution condition fitting of the radius and the thickness in the concentric circles of plaques;
step 2, generating a filter screen interface; dividing grids on the filter screen interface, calibrating coordinates of each grid and numbering;
step 3, generating a simulated concentric circular plaque on the filter screen interface according to the relation equation in the step 1; setting position coordinates of initial spraying on the filter screen interface, measuring and calculating the distance between each grid of the filter screen interface and the initial spraying position, adding a digital mark on the grids in the simulated concentric circle plaque range, wherein the digital mark represents the thickness condition of the concentric circle plaque on the grid position;
step 4, the concentric circles of plaques move on the filter screen interface according to a set movement rule; the set parameters of the movement rule comprise speed movement and movement tracks; adding digital marks to grids covered when simulating concentric circular plaque movement; when concentric circular spots at different moments cover the same grid, the digital marks on the grid are accumulated;
step 5, after the movement is completed, counting the accumulated thickness of the felt formed on the filter screen interface, and evaluating the thickness distribution uniformity of the felt; after the movement is completed, counting the number mark values in each grid of the filter screen, and converting the number mark values into thickness distribution conditions of the felt body on the filter screen;
and 6, changing the setting parameters of the movement law in the step 4, and repeating the steps 4 and 5 to obtain the movement law of the atomizer for manufacturing the felt body with uniform thickness distribution.
2. The method for improving the uniformity of slurry spraying and felting according to claim 1, wherein the specific method in the step 1 is as follows: spraying slurry onto a plane filter screen at a fixed position by an atomizer to obtain slurry concentric circle plaques, measuring the average thickness of the circular plaques at different radiuses to obtain data of the radius of the circular plaques and the thickness distribution of the slurry, and fitting a relation equation of the radius and the thickness distribution in the concentric circle plaques through the data.
3. The method of improving the uniformity of a slurry spray felting process according to claim 1, wherein in said step 5, the uniformity of the thickness distribution of the mat is evaluated by measuring the variance of the uniformity of the thickness distribution of the mat.
4. A method for improving the uniformity of a slurry spray felting process according to claim 3, wherein said step 5 is performed with a uniform felt having a uniformity variance of less than 0.05 for a felt having an average thickness of 1 cm.
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