A pre-coating device for gypsum board facing paper coating

Abstract

The present invention provides a pre-coating device for gypsum board facing paper coating, comprising a discharging unit and a coating roller unit arranged downstream of the discharging unit, which forms a reinforcement coating on the inner surfaces of the upper facing paper and the lower facing paper by a coating roller pressing method; a first steering roller assembly is arranged downstream of the coating roller pressing assembly, and is used to adjust the inner surface of the upper facing paper from an upward state to a downward state; a visual monitoring assembly is used to capture the transmission image of the upper facing paper and the lower facing paper before coating; a correction mechanism is arranged upstream of the coating roller pressing assembly, and the upper facing paper and the lower facing paper respectively pass through two correction guide rollers in sequence during transmission; the visual monitoring assembly and the correction mechanism are connected to a processing system, and the processing system obtains the offset of the upper facing paper and the lower facing paper before coating based on the monitoring results of the visual monitoring assembly, and the processing system regulates the operation of the correction mechanism; the present invention ensures that the upper facing paper and the lower facing paper can be firmly bonded, thereby improving the strength of the gypsum board.

Description

Technical Field

[0001] The invention relates to the technical field of gypsum boards, and in particular to a pre-coating device for a gypsum board facing paper coating. Background Art

[0002] In the traditional production process of facing paper gypsum board, the molded gypsum slurry is usually laid on the lower facing paper, and the upper facing paper is squeezed and bonded to the molded gypsum slurry. The bonding work of the lower and upper facing papers is achieved only by the viscosity of the molded gypsum slurry.

[0003] Since the bonding of the facing paper is achieved solely by relying on the viscosity of the formed gypsum slurry, the bonding between the upper and lower papers in the production of the gypsum board is unstable and easy to fall off, resulting in low strength of the gypsum board.

[0004] And to ensure that the coating distribution state formed on the inner surface of the upper and lower face paper remains stable at all times, and the coating gypsum slurry is always symmetrically spread on the face paper, it is necessary to set a correction station upstream of the coating roller pressing station of the upper and lower face paper. The existing correction operation is time-consuming because most of them first adjust the tilted transmitted face paper and then adjust the adjusted face paper to reset. It is still easy to have the problem of coating gypsum slurry laying deviation. Summary of the Invention

[0005] The purpose of the present invention is to provide a pre-coating device for gypsum board facing paper coating to solve the technical problems in the prior art of gypsum board production, such as unstable bonding between the upper and lower papers, easy paper peeling, resulting in low strength of the gypsum board, and easy deviation of the coating gypsum slurry laying.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] A pre-coating device for a gypsum board facing paper coating, comprising:

[0008] A coating roller assembly, comprising a discharge unit and a coating roller unit disposed downstream of the discharge unit, for forming a reinforcement coating on the inner surfaces of the upper and lower face paper by coating roller pressing;

[0009] a first steering roller assembly, disposed downstream of the coating roller assembly, for adjusting the inner surface of the upper face paper from an upward state to a downward state;

[0010] Visual monitoring components are respectively installed above the inner surface of the upper face paper and the inner surface of the lower face paper in an upward state, and are used to capture the transmission images of the upper face paper and the lower face paper before coating;

[0011] A deflection correction mechanism is provided upstream of the coating roller assembly, the deflection correction mechanism comprising two deflection correction guide rollers, and the upper and lower face paper respectively pass through the two deflection correction guide rollers in sequence during transmission;

[0012] The visual monitoring component and the correction mechanism are connected to a processing system. The processing system obtains the offset of the upper and lower face paper before coating based on the monitoring results of the visual monitoring component, and the processing system regulates the operation of the correction mechanism based on the offset.

[0013] As a preferred solution of the present invention, when the processing system processes the monitoring results of the visual monitoring component, the modules specifically used include:

[0014] an image processing module for performing image processing on the transmitted images of the upper and lower face sheets captured by the visual monitoring component so as to identify the straight lines on which the two side edges of the upper and lower face sheets lie, and for intercepting the transmitted images, retaining clear images of the two side edges of the upper and lower face sheets as analysis objects;

[0015] A real-time coordinate system construction module, configured to construct a real-time two-dimensional coordinate system with the center position of the face paper width of the analysis object as the origin;

[0016] an offset calculation module, which selects endpoint reference points from the straight lines on both sides of the upper and lower face sheets based on the real-time coordinate system construction module, determines an offset direction of the face sheet based on the coordinates of the endpoint reference points, and determines an offset amount of the face sheet based on the coordinates of the reference points on both sides;

[0017] a standard coordinate system construction module, which uses the transmitted image when the face paper is not offset as a reference image, and the center position of the face paper width of the reference image as the origin, constructs a standard two-dimensional coordinate system, selects feature points from the reference image, and determines the standard coordinate values ​​of the feature points in the standard two-dimensional coordinate system;

[0018] a deflection correction and control module, which controls the two deflection correction guide rollers of the deflection correction mechanism to work synchronously in opposite directions based on the determined deflection direction and deflection amount of the face paper, and the deflection amount of the two deflection correction guide rollers of the deflection correction mechanism is half of the deflection amount;

[0019] The standard two-dimensional coordinate system is reconstructed in the transmitted image after correction based on the standard coordinate values ​​of the feature points, a reference offset is determined based on the X-coordinate value of the origin of the two-dimensional coordinate system in the standard two-dimensional coordinate system, and the two correction guide rollers of the correction mechanism are regulated to work synchronously and in the same direction, and the regulated offset of the two correction guide rollers of the correction mechanism is the reference offset.

[0020] As a preferred embodiment of the present invention, the standard coordinate system construction module constructs a standard two-dimensional coordinate system using the center points of the upper and lower face paper in a non-offset state, and the real-time coordinate system construction module constructs a real-time two-dimensional coordinate system using the center points of the upper and lower face paper in real-time monitoring;

[0021] The offset calculation module determines the inclination angle of the straight line on which the side of the upper or lower face paper is located based on the real-time two-dimensional coordinate system, and calculates the oblique transmission offset of the upper or lower face paper in combination with the endpoint coordinate values ​​of the upper or lower face paper;

[0022] The offset calculation module calculates the center offset of the upper cover paper or the lower cover paper relative to the standard position based on the difference between the horizontal coordinates of the standard two-dimensional coordinate system and the real-time two-dimensional coordinate system.

[0023] As a preferred solution of the present invention, the correction control module controls the two correction stations based on the oblique transmission offset to perform synchronous reverse correction on the upper face paper or the lower face paper until the upper face paper or the lower face paper is corrected to be transmitted in the straight direction;

[0024] The correction and control module compares the origin coordinate values ​​of the real-time two-dimensional coordinate system of the upper and lower protective papers after correction with the standard two-dimensional coordinate system, and controls the two correction stations of the upper and lower protective papers to perform synchronous and unidirectional correction according to the comparison results, so that the upper and lower protective papers are corrected to be transmitted in a straight line along the standard point position.

[0025] As a preferred solution of the present invention, the real-time coordinate system construction module constructs a real-time two-dimensional coordinate system based on the center point of the upper face paper photographed in real time, and the implementation method of constructing a real-time two-dimensional coordinate system based on the center point of the lower face paper photographed in real time is the same, specifically:

[0026] performing image processing on transmission images of the upper and lower face sheets during transmission, respectively, so as to identify straight lines on which two side edges of the upper and lower face sheets are located;

[0027] The areas with obvious marks on both sides of the lower face paper are taken as analysis objects, and the center positions of the upper and lower face papers are determined. With the center positions of the upper and lower face papers as origins, two-dimensional coordinate systems are constructed respectively, wherein the X-axis is parallel to the width direction of the upper and lower face papers, and the Y-axis intersects the X-axis perpendicularly.

[0028] As a preferred embodiment of the present invention, a plurality of groups of symmetrical reference points are selected from the straight line where the two sides of the upper face paper are located, and the coordinate values ​​corresponding to the plurality of groups of reference points on the straight line where the two sides of the upper face paper are located are determined;

[0029] The offset calculation module determines the transmission offset direction of the upper face paper based on the coordinate values ​​corresponding to at least two reference points on a single side of the upper face paper obtained in sequence;

[0030] The offset calculation module calculates the coordinate values ​​corresponding to the plurality of groups of reference points on both sides of the upper face paper, and calculates the difference in X coordinate values ​​of the same group of reference points on both sides of the upper face paper to calculate the transmission offset of the upper face paper;

[0031] Selecting multiple groups of symmetrical reference points on the straight line where the two sides of the lower face paper are located, and determining the coordinate values ​​corresponding to the multiple groups of reference points on the straight line where the two sides of the lower face paper are located;

[0032] Determining a transmission offset direction of the lower face paper based on the sequentially acquired coordinate values ​​corresponding to at least two reference points on a single side of the lower face paper;

[0033] The offset calculation module calculates the coordinate values ​​corresponding to multiple groups of reference points on both sides of the lower cover paper, and calculates the difference in X coordinate values ​​of the same group of reference points on both sides of the lower cover paper to calculate the transmission offset of the lower cover paper.

[0034] As a preferred solution of the present invention, coordinate values ​​x1, x2, ... corresponding to at least two reference points are sequentially obtained along a single side straight line of the upper or lower face paper, and x1-x2 is calculated;

[0035] If (x1-x2)>0, the transmission offset direction of the upper or lower protective paper is the positive direction.

[0036] If (x1-x2) < 0, the upper or lower cover paper transmission offset direction is negative;

[0037] If (x1-x2) = 0, there is no transmission offset for the upper or lower face paper;

[0038] When (x1-x2)=0, the upper or lower face paper at this time indicates no transmission offset, and the standard coordinate system construction module constructs a two-dimensional coordinate system for the transmitted image of the upper or lower face paper at this time, and uses the two-dimensional coordinate system as the standard two-dimensional coordinate system corresponding to the case where the upper or lower face paper has no offset;

[0039] An object whose position remains unchanged is selected from the transmission image of the upper cover paper or the lower cover paper as a feature point, and the two-dimensional coordinate value of the feature point in the standard two-dimensional coordinate system is determined.

[0040] As a preferred solution of the present invention, the offset calculation module respectively determines the X coordinate values ​​x1a, x1b, x2a, and x2b of the upper and lower endpoints of the two sides of the lower cover paper or the upper cover paper;

[0041] The calculation formula of the transmission offset is: Py= .

[0042] As a preferred solution of the present invention, the value of x1-x2 is obtained based on the inclination of the straight line on which the single side of the upper face paper or the lower face paper is located in the two-dimensional coordinate system. When (x1-x2)≠0, two correction stations are used to perform synchronous reverse correction on the upper face paper or the lower face paper according to the transmission offset of the upper face paper or the lower face paper;

[0043] When (x1-x2)>0, the correction control module controls the correction direction of the upper or lower face paper by the correction station located upstream to the negative direction of the X axis, with a specific correction amount of 1 / 2Py; the correction direction of the upper or lower face paper by the correction station located downstream to the positive direction of the X axis, with a specific correction amount of 1 / 2Py;

[0044] When (x1-x2) is less than 0, the correction control module controls the correction direction of the upper or lower protective paper by the correction station at the upstream to be in the positive direction of the X-axis, and the specific correction amount is 1 / 2Py; the correction direction of the upper or lower protective paper by the correction station at the downstream to be in the negative direction of the X-axis, and the specific correction amount is 1 / 2Py.

[0045] As a preferred solution of the present invention, the correction control module uses two correction stations to perform synchronous reverse correction on the upper face paper or the lower face paper, and then reconstructs and restores the standard two-dimensional coordinate system of the transmitted image of the upper face paper or the lower face paper after correction, and determines the standard coordinate value of the origin of the two-dimensional coordinate system in the standard two-dimensional coordinate system. Based on the X coordinate value of the standard coordinate value, the two correction stations are controlled to perform synchronous same-direction correction to restore the standard two-dimensional coordinate system:

[0046] Finding corresponding feature points on the transmission image of the upper cover paper or the lower cover paper, and reconstructing and restoring a standard two-dimensional coordinate system on the transmission image based on the standard two-dimensional coordinate values ​​of all feature points;

[0047] Determine the X coordinate value x0 of the origin of the two-dimensional coordinate system in the standard two-dimensional coordinate system;

[0048] Among them, when the X coordinate value x0>0, the correction control module controls the two correction stations to correct the upper or lower face paper in the negative direction of the X axis, and the specific correction amount is ;

[0049] When the X coordinate value x0 is less than 0, the correction control module controls the two correction stations to correct the upper or lower face paper in the positive direction of the X axis. The specific correction amount is ;

[0050] When the X coordinate value x0=0, the deviation correction control module does not control the operation of the two deviation correction stations.

[0051] Compared with the prior art, the present invention has the following beneficial effects:

[0052] The present invention utilizes the bonding force between the reinforcement coating and the formed gypsum slurry to ensure that both the upper and lower face papers can be firmly bonded, thereby improving the strength of the gypsum board.

[0053] When the present invention actively adjusts the upper and lower face guard papers to reset, it uses the correction components of the two correction stations to perform synchronous bidirectional correction, so that the face guard paper after the first correction is as close to the standard position as possible, reducing the correction operation time, and also reducing the operation time of the second correction of the face guard paper after the first correction, effectively avoiding the subsequent reinforcement coating deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0055] Figure 1 Schematic diagram of the structure of a pre-coating device according to an embodiment of the present invention;

[0056] Figure 2 This is a schematic structural diagram of a coating roller assembly according to an embodiment of the present invention;

[0057] Figure 3 is a structural block diagram of a control system according to an embodiment of the present invention;

[0058] Figure 4 This is a structural block diagram of a control system for a coating roller assembly according to an embodiment of the present invention;

[0059] Figure 5 A schematic diagram of the correction amount of a conventional correction implementation method according to an embodiment of the present invention;

[0060] Figure 6 Schematic diagram of the correction amount of the correction implementation method according to an embodiment of the present invention;

[0061] The numbers in the figure represent the following:

[0062] 1- coating roller assembly; 2- first steering roller assembly; 3- visual monitoring assembly; 4- deviation correction mechanism; 5- processing system;

[0063] 101-discharging unit; 102-coating roller unit;

[0064] 51-image processing module; 52-real-time coordinate system construction module; 53-offset calculation module; 54-standard coordinate system construction module; 55-correction control module;. DETAILED DESCRIPTION

[0065] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0066] like Figure 1 As shown, the present invention also provides a pre-coating device for gypsum board facing paper coating, such as Figure 1 and Figure 2 As shown, it includes a coating roller assembly 1, a first steering roller assembly 2, a visual monitoring assembly 3 and a correction mechanism 4.

[0067] The coating roller assembly 1 includes a discharge unit 101 and a coating roller unit 102 disposed downstream of the discharge unit 101 , and forms a reinforcement coating on the inner surfaces of the upper face paper and the lower face paper by coating roller pressing.

[0068] Specifically, two coating roller assemblies 1 are provided, which are respectively provided on the inner surface of the upper face paper and the inner surface of the lower face paper.

[0069] Among them, each coating roller assembly 1 is divided into an upper protective paper coating mechanism and a lower protective paper coating mechanism. The upper protective paper coating mechanism and the lower protective paper coating mechanism both include a discharge unit 101 and a coating roller unit 102 arranged downstream of the discharge unit 101. The discharge unit 101 is used to output high-density gypsum slurry on the lower surface of the upper protective paper and the center position of the lower surface of the upper protective paper. The coating roller unit 102 is used to extrude and lay the high-density gypsum slurry and form a thin coating on the lower surface of the upper protective paper and the lower surface of the upper protective paper.

[0070] In the traditional production process of facing paper gypsum board, the molded gypsum slurry is usually laid on the lower facing paper, and the upper facing paper is squeezed and bonded to the molded gypsum slurry. The bonding work of the lower and upper facing papers is achieved only by the viscosity of the molded gypsum slurry.

[0071] In this embodiment, before the formed gypsum slurry is laid, high-density gypsum slurry is coated on the lower surface of the upper protective paper by the upper protective paper coating mechanism, and high-density gypsum slurry is coated on the upper surface of the lower protective paper by the lower protective paper coating mechanism, and a thin coating is formed on the lower surface of the upper protective paper and the lower surface of the upper protective paper. The bonding force between the thin coating and the formed gypsum slurry is utilized to ensure that the upper and lower protective papers are firmly bonded, thereby improving the strength of the gypsum board.

[0072] In order to achieve the extrusion and laying of high-density gypsum slurry to form a thin coating on the lower surface of the upper protective paper and the lower surface of the upper protective paper, the coating roller unit 102 of the upper protective paper coating mechanism includes a first extrusion roller and a second extrusion roller arranged on the upper and lower sides of the upper protective paper.

[0073] The coating roller unit 102 of the lower face paper coating mechanism includes a third squeezing roller disposed above the lower face paper.

[0074] In order to leave blank areas on both sides of the upper and lower face paper to facilitate the subsequent folding work, the length of the second squeezing roller is smaller than the width of the upper face paper, and the length of the third squeezing roller is smaller than the width of the lower face paper.

[0075] The first steering roller assembly 2 is arranged downstream of the coating roller assembly 1, and is used to adjust the inner surface of the upper face paper from an upward state to a downward state. In order to realize the coating work on the inner surface of the upper face paper, the inner surface of the upper face paper needs to be transported in an upward manner first, and then transformed into a downward manner after passing through the first steering roller assembly 2, so as to facilitate laying on the gypsum slurry to form a gypsum board wet board.

[0076] The visual monitoring components 3 are respectively installed above the inner surface of the upper face paper and the inner surface of the lower face paper in an upward state, and are used to capture the transmission images of the upper face paper and the lower face paper before coating.

[0077] There are two visual monitoring components 3, one on the upper face paper transmission line and the other on the lower face paper transmission line, and are specifically installed upstream of the coating roller pressing component 1.

[0078] The correcting mechanism 4 is arranged upstream of the coating roller assembly 1. The correcting mechanism 4 includes two correcting guide rollers. When the upper protective paper and the lower protective paper are transmitted, they pass through the two correcting guide rollers in sequence. Similarly, there are two correcting mechanisms 4, one on the upper protective paper transmission line and the other on the lower protective paper transmission line.

[0079] The visual monitoring component 3 and the correction mechanism 4 are connected to a processing system 5. The processing system 5 obtains the offset of the upper and lower protective papers before coating based on the monitoring results of the visual monitoring component 3, and the processing system 5 regulates the operation of the correction mechanism 4 based on the offset.

[0080] like Figure 3 and Figure 4 As shown, when the processing system 5 processes the monitoring results of the visual monitoring component 3, the specific modules used include: image processing module 51, real-time coordinate system construction module 52, offset calculation module 53, standard coordinate system construction module 54 and correction and control module 55.

[0081] The image processing module 51 is used to process the transmitted image of the upper and lower face sheets captured by the visual monitoring component 3 so as to identify the straight lines on which the two side edges of the upper and lower face sheets lie, and to intercept the transmitted image, retaining the clear images of the two side edges of the upper and lower face sheets as the analysis object;

[0082] The real-time coordinate system construction module 52 is used to construct a two-dimensional coordinate system with the center position of the face paper width of the analysis object as the origin;

[0083] The offset calculation module 53 selects multiple groups of reference points from the straight lines on both sides of the upper and lower face sheets based on the real-time coordinate system construction module 52, determines the offset direction of the face sheet based on the coordinates of at least two reference points on a single side, and determines the offset amount of the face sheet based on the coordinates of the reference points on both sides;

[0084] The standard coordinate system construction module 54 uses the transmitted image without face paper offset as the reference image and the center position of the face paper width of the reference image as the origin to construct a standard two-dimensional coordinate system, selects feature points from the reference image, and determines the standard coordinate values ​​of the feature points in the standard two-dimensional coordinate system;

[0085] The correction control module 55 controls the two correction guide rollers of the correction mechanism 4 to work synchronously in opposite directions based on the determined offset direction and offset of the face paper, and the adjustment offset of the two correction guide rollers of the correction mechanism 4 is half of the offset;

[0086] And based on the standard coordinate values ​​of the feature points, a standard two-dimensional coordinate system is reconstructed in the transmitted image after correction, and the reference offset is determined based on the X coordinate value of the origin of the two-dimensional coordinate system in the standard two-dimensional coordinate system, and the two correction guide rollers of the correction mechanism 4 are regulated to work synchronously and in the same direction, and the regulated offset of the two correction guide rollers of the correction mechanism 4 is the reference offset.

[0087] In addition, this embodiment monitors the transmission offset direction and transmission offset of the upper and lower protective papers in real time before the coating roller assembly 1, and actively adjusts the upper and lower protective papers to reset, so that the center position of the coating roller unit 102 of the upper and lower protective paper coating mechanisms, the center position of the discharge unit 101 and the center axis of the protective paper are always in the same plane, thereby ensuring that the reinforcement coating formed on the inner surface of the lower protective paper is symmetrically distributed about the center axis of the lower protective paper, and the width of the blank areas left on both sides of the lower protective paper is the same, and the reinforcement coating formed on the inner surface of the upper protective paper is symmetrically distributed about the center axis of the upper protective paper, and the width of the blank areas left on both sides of the upper protective paper is the same, so that the bonding force between the upper and lower protective papers and the formed gypsum slurry is evenly dispersed, ensuring that the upper and lower protective papers will not bulge.

[0088] Among them, when actively adjusting the upper and lower face paper and resetting the lower face paper, the correction components of the two correction stations are used to perform synchronous bidirectional correction, so that the face paper after the first correction is as close to the standard position as possible, reducing the correction operation time, and also reducing the operation time of the second correction of the face paper after the first correction, effectively avoiding the subsequent displacement of the reinforcement coating.

[0089] If a single correction station is driven to perform correction work, the upper or lower face paper will deviate from the original position by a greater amount, such as Figure 5 As shown, the offset is a, and then the two correction stations are driven to perform synchronous and unidirectional correction work. When the upper or lower face paper is driven to the original position, the overall correction distance is relatively long.

[0090] In order to improve the efficiency of the correction work, the technical solution adopted in this embodiment is: first, through visual monitoring, the transmission deviation direction and deviation amount of the upper and lower face paper are identified, and then the two correction stations perform synchronous reverse correction on the upper face paper or the lower face paper, such as Figure 6 As shown, the offset is b. Obviously, b is much smaller than a. Subsequently, the two correction stations are driven to perform synchronous and unidirectional correction work. When the upper or lower face paper is driven to the original position, the overall correction distance is short, so the control time is short, and a quick reset operation can be achieved.

[0091] To calculate the transmission offset direction and offset amount of the upper and lower face sheets, the specific implementation method is as follows: first construct a two-dimensional coordinate system, and then determine the offset direction and offset amount based on the straight lines on the two sides of the upper and lower face sheets in combination with the two-dimensional coordinate system. The two-dimensional coordinate system is constructed using the center point of the upper face sheet in the same way as the center point of the lower face sheet, specifically:

[0092] Performing image processing on the transmission images of the upper and lower face sheets during transmission, respectively, so as to identify the straight lines on which the two side edges of the upper and lower face sheets are located;

[0093] The areas with obvious traces on both sides of the lower face paper are taken as the analysis objects, and the center positions of the upper and lower face papers are determined. The center positions of the upper and lower face papers are taken as the origins, and two-dimensional coordinate systems are constructed respectively, where the X-axis is parallel to the width direction of the upper and lower face papers, the Y-axis is orthogonal to the X-axis direction, and the intersection is the origin.

[0094] When calculating the transmission offset of the upper and lower cover papers respectively, the transmission offset direction and the specific offset are determined respectively. The implementation method is as follows:

[0095] (1) Selecting multiple sets of symmetrical reference points on the straight lines where the two sides of the upper face paper are located, and determining the coordinate values ​​corresponding to the multiple sets of reference points on the straight lines where the two sides of the upper face paper are located;

[0096] (2) determining the transmission offset direction of the upper face paper based on the coordinate values ​​corresponding to at least two reference points on a single side of the upper face paper obtained in sequence;

[0097] (3) Calculate the coordinate values ​​corresponding to the multiple groups of reference points on both sides of the upper protective paper, and calculate the difference in the X coordinate values ​​of the same group of reference points on both sides of the upper protective paper to calculate the transmission offset of the upper protective paper;

[0098] Similarly, the offset calculation method for the lower cover paper is the same as the offset calculation method for the upper cover paper:

[0099] (1) Selecting multiple sets of symmetrical reference points on the straight line where the two sides of the lower face paper are located, and determining the coordinate values ​​corresponding to the multiple sets of reference points on the straight line where the two sides of the lower face paper are located;

[0100] (2) determining the transmission offset direction of the lower face paper based on the coordinate values ​​corresponding to at least two reference points on a single side of the lower face paper obtained in sequence;

[0101] (3) Calculate the coordinate values ​​corresponding to multiple groups of reference points on both sides of the lower face paper, and calculate the difference in the X coordinate values ​​of the same group of reference points on both sides of the lower face paper to calculate the transmission offset of the lower face paper.

[0102] Obtain coordinate values ​​x1, x2, ..., corresponding to at least two reference points along a straight line on a single side of the upper or lower cover paper, and calculate x1-x2;

[0103] If (x1-x2)>0, the transmission offset direction of the upper or lower protective paper is the positive direction.

[0104] If (x1-x2) < 0, the upper or lower cover paper transmission offset direction is negative;

[0105] If (x1-x2) = 0, there is no transmission offset of the upper or lower cover paper.

[0106] When (x1-x2)=0, the upper or lower face paper at this time indicates no transmission offset. A two-dimensional coordinate system is constructed for the transmitted image of the upper or lower face paper at this time, and this two-dimensional coordinate system is used as the standard two-dimensional coordinate system corresponding to the case where the upper or lower face paper has no offset.

[0107] An object whose position remains unchanged is selected from the transmitted image of the upper or lower cover paper as a feature point, and the two-dimensional coordinate value of the feature point in the standard two-dimensional coordinate system is determined. Specifically, the feature point is distributed in the four quadrants of the standard two-dimensional coordinate system.

[0108] The implementation method of calculating the transmission offset of the upper or lower cover paper is as follows:

[0109] Determine the X coordinate values ​​x1a, x1b, x2a, and x2b of the upper and lower endpoints of the two sides of the lower or upper cover paper respectively;

[0110] The calculation formula for transmission offset is: Py= .

[0111] As an innovation of this embodiment, in step 300, the value of x1-x2 is obtained based on the inclination of the straight line on which the single side of the upper or lower face paper lies in the two-dimensional coordinate system. When (x1-x2)≠0, two correction stations are used to perform synchronous reverse correction on the upper or lower face paper based on the transmission offset of the upper or lower face paper. The specific implementation method is as follows:

[0112] When (x1-x2)>0, the correction direction of the upstream correction station for the upper or lower face paper is adjusted to the negative direction of the X axis, and the specific correction amount is 1 / 2Py. The correction direction of the downstream correction station for the upper or lower face paper is adjusted to the positive direction of the X axis, and the specific correction amount is 1 / 2Py.

[0113] When (x1-x2) is less than 0, the correction direction of the upstream correction station for the upper or lower face paper is adjusted to the positive direction of the X-axis, and the specific correction amount is 1 / 2Py. The correction direction of the downstream correction station for the upper or lower face paper is adjusted to the negative direction of the X-axis, and the specific correction amount is 1 / 2Py.

[0114] If a single correction station is driven to perform correction work, the upper or lower face paper will deviate from its original position by a greater amount. When (x1-x2)>0, the correction direction of the upper or lower face paper by the correction station located upstream is adjusted to be in the negative direction of the X-axis, and the specific correction amount is Py. At this time, the offset operation time in this case is greater than the offset operation time t1 of this embodiment.

[0115] When (x1-x2) is less than 0, the correction direction of the upper or lower face paper by the upstream correction station is adjusted to the positive direction of the X axis, and the specific correction amount is Py. Similarly, the offset operation time in this case is greater than the offset operation time t1' of this embodiment.

[0116] Through the above comparison, it is obvious that this embodiment uses two correction stations to perform synchronous reverse correction on the upper cover paper or the lower cover paper, so the correction amount in this step is 1 / 2Py, and the offset operation time of this embodiment is relatively short.

[0117] After using two correction stations to perform synchronous reverse correction on the upper or lower facing paper, there may be a situation where the facing paper after synchronous reverse correction is transmitted in an aligned manner, but it deviates from its original position. If it is not regulated, the upper and lower facing papers will be offset from each other, affecting the subsequent production of gypsum boards.

[0118] Therefore, it is necessary to process the transmitted image of the upper or lower face paper after the first deflection correction to identify whether a second deflection correction is required. The specific implementation method is as follows:

[0119] The standard two-dimensional coordinate system is reconstructed and restored from the transmitted image of the upper or lower cover paper after correction, and the standard coordinate value of the origin of the two-dimensional coordinate system in the standard two-dimensional coordinate system is determined. Based on the X coordinate value of the standard coordinate value, the two correction stations are regulated to perform synchronous and unidirectional correction. The standard two-dimensional coordinate system is restored as follows:

[0120] Finding corresponding feature points on the transmitted image of the upper or lower cover paper, and reconstructing and restoring a standard two-dimensional coordinate system on the transmitted image based on the standard two-dimensional coordinate values ​​of all feature points;

[0121] Determine the X coordinate value x0 of the origin of the two-dimensional coordinate system in the standard two-dimensional coordinate system;

[0122] Among them, when the X coordinate value x0>0, the two correction stations are adjusted to correct the upper or lower face paper in the negative direction of the X axis. The specific correction amount is ;

[0123] When the X coordinate value x0 is less than 0, the two correction stations are adjusted to correct the upper or lower face paper in the positive direction of the X axis. The specific correction amount is ;

[0124] When the X coordinate value x0=0, the two deviation correction stations are not regulated.

[0125] It should be noted that the standard two-dimensional coordinate system is based on the transmission image obtained when there is no transmission offset of the upper protective paper or the lower protective paper. At this time, the standard two-dimensional coordinate system is constructed based on the center point position of the upper protective paper or the lower protective paper. The center point position at this time is the midpoint position in the width direction of the upper protective paper or the lower protective paper.

[0126] Therefore, when reconstructing the standard two-dimensional coordinate system on the transmitted image of the upper cover paper or the lower cover paper after correction, the specific method of determining the origin of the standard two-dimensional coordinate system is to determine the origin of the standard two-dimensional coordinate system using the X coordinate value and Y coordinate value of the feature point whose position remains unchanged.

[0127] After constructing the standard 2D coordinate system, determine the X coordinate value x0 of the origin of the 2D coordinate system in the standard 2D coordinate system. If the X coordinate value x0 of the origin of the 2D coordinate system in the standard 2D coordinate system is 0, it means that the face paper has returned to its original position after the first correction adjustment and no secondary correction is required.

[0128] When the origin of the two-dimensional coordinate system is at the X coordinate value x0≠0 in the standard two-dimensional coordinate system, the offset direction of the face paper relative to the original position after the first correction adjustment is determined based on the positive or negative value of the X coordinate value, thereby determining the correction direction and specific correction amount.

[0129] Based on the above-mentioned pre-coating device for the gypsum board facing paper coating, the present invention provides a pre-coating method for the gypsum board facing paper coating, comprising the following steps:

[0130] Step 100: The upper face paper is transferred in a direction-adjusted manner, whereby the inner surface of the upper face paper is adjusted from an upward state to a downward state, while the inner surface of the lower face paper is always transferred in an upward state.

[0131] Step 200: Construct a standard two-dimensional coordinate system corresponding to when the upper and lower face sheets are not offset, monitor the transmission images of the upper and lower face sheets in real time during transmission, construct a two-dimensional coordinate system using the center points of the upper and lower face sheets, and calculate the transmission offsets of the upper and lower face sheets respectively;

[0132] Step 300: Two correcting stations are respectively provided upstream of the coating roller pressing station for the upper face paper and the coating roller pressing station for the lower face paper. The two correcting stations are used to perform synchronous reverse correction on the upper face paper or the lower face paper according to the transmission offset of the upper face paper and the lower face paper. The two-dimensional coordinate systems of the corrected upper face paper and the lower face paper are compared with the origin coordinate values ​​of the standard two-dimensional coordinate system. Based on the comparison results, the two correcting stations of the upper face paper and the lower face paper are adjusted to perform synchronous same-direction correction.

[0133] Step 400: Pour coating gypsum slurry onto the inner surface of the upper and lower face paper facing upwards, respectively, and form a reinforcement coating on the inner surface of the upper and lower face paper by coating and rolling.

[0134] Step 500: Pour gypsum slurry onto the inner surface of the lower face paper, and after the gypsum slurry is spread, squeeze the upper face paper to stick to the upper surface of the spread gypsum slurry.

[0135] In the traditional production process of facing paper gypsum board, the molded gypsum slurry is usually laid on the lower facing paper, and the upper facing paper is squeezed and bonded to the molded gypsum slurry. The bonding of the lower and upper facing papers is achieved solely by the viscosity of the molded gypsum slurry. When the gypsum board is dried, the adhesion between the facing paper as the heated surface and the gypsum slurry is easily destroyed by high temperature, the board bonding is poor, and the paper is easily peeled off, resulting in low strength of the gypsum board.

[0136] In this embodiment, on the gypsum board production line, before the gypsum slurry is poured into the lower facing paper, the inner surface of the upper facing paper and the inner surface of the lower facing paper are coated with coating gypsum slurry. Alternatively, the inner surface of the upper facing paper or the inner surface of the lower facing paper can be coated with coating gypsum slurry. The coating facing paper of the coating gypsum slurry is selected according to the installation position of the heating pipe of the drying chamber to add a layer of high-density gypsum slurry on the surface of the upper paper. After adding, during the drying process, the surface of the facing paper is protected from the interaction with the gypsum crystals, thereby preventing high temperature damage, thereby improving the adhesion between the upper and lower facing papers and the formed gypsum slurry.

[0137] In addition, this embodiment is based on the upper protective paper and the offset of the upper protective paper during transmission, and actively corrects the upper and lower protective papers to ensure that the coating distribution state formed on the inner surfaces of the upper and lower protective papers always remains stable, and the coating gypsum slurry is always symmetrically spread on the protective paper to ensure that the reinforcement coating formed on the inner surfaces of the upper and lower protective papers is symmetrically distributed about the central axis of the lower protective paper, and the width of the blank areas left on both sides of the upper and lower protective papers is the same. The reinforcement coating formed on the inner surface of the upper protective paper is symmetrically distributed about the central axis of the upper protective paper, and the width of the blank areas left on both sides of the upper protective paper is the same. Therefore, the bonding force between the upper and lower protective papers and the formed gypsum slurry is evenly dispersed, ensuring that the upper and lower protective papers will not peel off or bulge.

[0138] The above embodiments are merely exemplary embodiments of the present application and are not intended to limit the scope of the present application. The scope of protection of the present application is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present application within the essence and scope of protection of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the scope of protection of the present application.

Claims

1. A pre-coating device for gypsum board facing paper coating, characterized in that: include: A coating roller assembly (1) comprises a discharge unit (101) and a coating roller unit (102) arranged downstream of the discharge unit (101), and forms a reinforcement coating on the inner surfaces of the upper face paper and the lower face paper by coating roller pressing; a first steering roller assembly (2), arranged downstream of the coating roller assembly (1), and used for adjusting the inner surface of the upper face paper from an upward state to a downward state; Visual monitoring components (3) are respectively installed above the inner surface of the upper protective paper in an upward state and above the inner surface of the lower protective paper, and are used to capture the transmission images of the upper protective paper and the lower protective paper before coating; A deflection correction mechanism (4) is arranged upstream of the coating roller assembly (1), the deflection correction mechanism (4) comprising two deflection correction guide rollers, and the upper face paper and the lower face paper respectively pass through the two deflection correction guide rollers in sequence during transmission; The visual monitoring component (3) and the correction mechanism (4) are connected to a processing system (5), and the processing system (5) obtains the offset of the upper face paper and the lower face paper before coating based on the monitoring result of the visual monitoring component (3), and the processing system (5) regulates the operation of the correction mechanism (4) based on the offset; When the processing system (5) processes the monitoring results of the visual monitoring component (3), the modules used specifically include: An image processing module (51) is used to process the transmission image of the upper and lower face paper taken by the visual monitoring component (3) so as to identify the straight lines on which the two side edges of the upper and lower face paper are located, and to intercept the transmission image, retaining the clear images of the two side edges of the upper and lower face paper as analysis objects; A real-time coordinate system construction module (52) is used to construct a real-time two-dimensional coordinate system with the center position of the face paper width of the analysis object as the origin; An offset calculation module (53) selects endpoint reference points from the straight lines on both sides of the upper and lower face paper based on the real-time coordinate system construction module (52), determines the offset direction of the face paper based on the coordinates of the endpoint reference points, and determines the offset amount of the face paper based on the coordinates of the reference points on both sides; A standard coordinate system construction module (54) uses the transmitted image when the face paper is not offset as a reference image, and uses the center position of the face paper width of the reference image as the origin to construct a standard two-dimensional coordinate system, selects feature points from the reference image, and determines the standard coordinate values ​​of the feature points in the standard two-dimensional coordinate system; A deviation correction control module (55) controls the two deviation correction guide rollers of the deviation correction mechanism (4) to work synchronously in the opposite direction based on the determined deviation direction and deviation amount of the face paper, and the control deviation amount of the two deviation correction guide rollers of the deviation correction mechanism (4) is half of the deviation amount; The standard two-dimensional coordinate system is reconstructed in the transmission image after correction based on the standard coordinate value of the feature point, a reference offset is determined based on the X coordinate value of the origin of the real-time two-dimensional coordinate system in the standard two-dimensional coordinate system, and the two correction guide rollers of the correction mechanism (4) are regulated to work synchronously and in the same direction, and the regulated offset of the two correction guide rollers of the correction mechanism (4) is the reference offset.

2. The pre-coating device for gypsum board facing paper coating according to claim 1, characterized in that: The standard coordinate system construction module (54) constructs a standard two-dimensional coordinate system with the center points of the upper and lower face paper in a non-offset state, and the real-time coordinate system construction module (52) constructs a real-time two-dimensional coordinate system by monitoring the center points of the upper and lower face paper in real time; The offset calculation module (53) determines the inclination angle of the straight line where the side of the upper face paper or the lower face paper is located based on the real-time two-dimensional coordinate system, and calculates the oblique transmission offset of the upper face paper or the lower face paper in combination with the endpoint coordinate values ​​of the upper face paper or the lower face paper; The offset calculation module (53) calculates the center offset of the upper face paper or the lower face paper relative to the standard position based on the horizontal coordinate difference between the standard two-dimensional coordinate system and the real-time two-dimensional coordinate system.

3. The pre-coating device for gypsum board facing paper coating according to claim 1, characterized in that: The deflection correction control module (55) controls two deflection correction stations based on the oblique transmission offset to perform synchronous reverse deflection correction on the upper face paper or the lower face paper, until the upper face paper or the lower face paper is corrected to be transmitted in a straight direction; The correction control module (55) compares the origin coordinate values ​​of the real-time two-dimensional coordinate system of the upper and lower face paper after correction with the standard two-dimensional coordinate system, and controls the two correction stations of the upper and lower face paper to perform synchronous and unidirectional correction according to the comparison result, so that the upper and lower face paper are corrected to be aligned and transmitted along the standard point position.

4. The pre-coating device for gypsum board facing paper coating according to claim 2, characterized in that: The real-time coordinate system construction module (52) constructs a real-time two-dimensional coordinate system based on the center point of the upper face paper photographed in real time, and the implementation method of constructing a real-time two-dimensional coordinate system based on the center point of the lower face paper photographed in real time is the same as that of constructing a real-time two-dimensional coordinate system, specifically: performing image processing on transmission images of the upper and lower face sheets during transmission, respectively, so as to identify straight lines on which two side edges of the upper and lower face sheets are located; The areas with obvious marks on both sides of the lower face paper are taken as analysis objects, and the center positions of the upper and lower face papers are determined. With the center positions of the upper and lower face papers as origins, two-dimensional coordinate systems are constructed respectively, wherein the X-axis is parallel to the width direction of the upper and lower face papers, and the Y-axis intersects the X-axis perpendicularly.

5. The pre-coating device for gypsum board facing paper coating according to claim 4, characterized in that: Selecting multiple groups of symmetrical reference points on the straight line where the two sides of the upper face paper are located, and determining the coordinate values ​​corresponding to the multiple groups of reference points on the straight line where the two sides of the upper face paper are located; The offset calculation module (53) determines the transmission offset direction of the upper face paper based on the coordinate values ​​corresponding to at least two control points on a single side of the upper face paper obtained in sequence; The offset calculation module (53) calculates the coordinate values ​​corresponding to the plurality of groups of control points on both sides of the upper face paper, and calculates the difference in the X coordinate values ​​of the same group of control points on both sides of the upper face paper, so as to calculate the transmission offset of the upper face paper; Selecting multiple groups of symmetrical reference points on the straight line where the two sides of the lower face paper are located, and determining the coordinate values ​​corresponding to the multiple groups of reference points on the straight line where the two sides of the lower face paper are located; Determining a transmission offset direction of the lower face paper based on the sequentially acquired coordinate values ​​corresponding to at least two reference points on a single side of the lower face paper; The offset calculation module (53) calculates the coordinate values ​​corresponding to the multiple groups of control points on both sides of the lower face paper, and calculates the difference in X coordinate values ​​of the same group of control points on both sides of the lower face paper to calculate the transmission offset of the lower face paper.

6. The pre-coating device for gypsum board facing paper coating according to claim 5, characterized in that: Sequentially obtain coordinate values ​​x1, x2, ... corresponding to at least two reference points along a single side straight line of the upper or lower face paper, and calculate x1-x2; If (x1-x2)>0, the transmission offset direction of the upper or lower protective paper is the positive direction. If (x1-x2) < 0, the upper or lower cover paper transmission offset direction is negative; If (x1-x2) = 0, there is no transmission offset for the upper or lower face paper; Wherein, when (x1-x2)=0, the upper face paper or the lower face paper at this time indicates that there is no transmission offset, and the standard coordinate system construction module (54) constructs a two-dimensional coordinate system for the transmission image of the upper face paper or the lower face paper at this time, and uses the two-dimensional coordinate system as the standard two-dimensional coordinate system corresponding to the upper face paper and the lower face paper when there is no offset; An object whose position remains unchanged is selected from the transmission image of the upper cover paper or the lower cover paper as a feature point, and the two-dimensional coordinate value of the feature point in the standard two-dimensional coordinate system is determined.

7. The pre-coating device for gypsum board facing paper coating according to claim 2, characterized in that: The offset calculation module (53) respectively determines the X-coordinate values ​​x1a, x1b, x2a, and x2b of the upper and lower endpoints of the two sides of the lower face paper or the upper face paper; The calculation formula of the transmission offset is: Py= .

8. The pre-coating device for gypsum board facing paper coating according to claim 7, characterized in that: Obtaining a value of x1-x2 based on the inclination of a straight line on a single side of the upper or lower face paper in a two-dimensional coordinate system, and when (x1-x2) ≠ 0, performing synchronous reverse deflection correction on the upper or lower face paper using two deflection correction stations based on a transmission offset of the upper or lower face paper; Wherein, when (x1-x2)>0, the correction control module (55) controls the correction direction of the upper or lower face paper of the correction station located upstream to the negative direction of the X axis, and the specific correction amount is 1 / 2Py, and the correction direction of the upper or lower face paper of the correction station located downstream to the positive direction of the X axis, and the specific correction amount is 1 / 2Py; When (x1-x2) is less than 0, the correction control module (55) controls the correction direction of the upper or lower protective paper by the correction station located upstream to the positive direction of the X axis, and the specific correction amount is 1 / 2Py, and the correction direction of the upper or lower protective paper by the correction station located downstream to the negative direction of the X axis, and the specific correction amount is 1 / 2Py.

9. The pre-coating device for gypsum board facing paper coating according to claim 8, characterized in that: The correction control module (55) uses two correction stations to perform synchronous reverse correction on the upper face paper or the lower face paper, and reconstructs and restores the standard two-dimensional coordinate system from the transmission image of the corrected upper face paper or the lower face paper, and determines the standard coordinate value of the origin of the two-dimensional coordinate system in the standard two-dimensional coordinate system, and controls the two correction stations to perform synchronous same-direction correction based on the X coordinate value of the standard coordinate value to restore the standard two-dimensional coordinate system: Finding corresponding feature points on the transmission image of the upper cover paper or the lower cover paper, and reconstructing and restoring a standard two-dimensional coordinate system on the transmission image based on the standard two-dimensional coordinate values ​​of all feature points; Determine the X coordinate value x0 of the origin of the two-dimensional coordinate system in the standard two-dimensional coordinate system; When the X coordinate value x0>0, the correction control module (55) controls the two correction stations to correct the upper face paper or the lower face paper in the negative direction of the X axis, and the specific correction amount is ; When the X coordinate value x0 is less than 0, the correction control module (55) controls the two correction stations to correct the upper face paper or the lower face paper in the positive direction of the X axis, and the specific correction amount is ; When the X coordinate value x0=0, the deviation correction control module (55) does not control the operation of the two deviation correction stations.

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