Dry-method forming process and equipment for non-facing gypsum board

Abstract

The invention relates to a production technology of building profiles, in particular to a dry-method forming process and equipment for a non-facing gypsum board, mainly comprising a forming mechanism, a paving mechanism, a mixing mechanism and a finishing mechanism, through a low-water-quantity anti-adhesion stirring procedure and development of matched mechanisms, a paste paving procedure and development of matched mechanisms, the dry-method forming process of the non-facing gypsum board is realized, and the dry-method forming equipment of the non-facing gypsum board is obtained. A three-stage continuous forming procedure and matched mechanism development are adopted, so that remarkable innovation of a traditional gypsum board production technology is realized; according to the technological process, gypsum powder is stirred into a semi-flowing paste shape through a low amount of water, then dry-method continuous manufacturing of the gypsum board is achieved through the three-stage extrusion forming and secondary water supplementing technology, and the actual water consumption can be controlled to be about 20. Surface protection paper or fiber cloth does not need to be laid on the upper surface and the lower surface of the gypsum board manufactured through the dry method, the board surface is compact in shape, tensile strength and compressive strength are higher than those of a traditional paper face gypsum board and a traditional fiber gypsum board, a large amount of paper is saved, and particularly the drying cost can be greatly reduced.

Description

Technical Field

[0001] The invention relates to a production technology of building profiles, in particular to a dry-forming process and equipment for unfaced gypsum boards. Background Art

[0002] The production and molding of gypsum building profiles is based on the chemical reaction and rapid solidification of gypsum after adding water. The main raw material is gypsum powder (also known as hemihydrate gypsum CaSO 4 •0.5H 2 O) and water react to form water-insoluble solid dihydrate gypsum. This process is called curing and molding. The theoretical water requirement for hydration reaction is 18.62%, while the actual water requirement for the production of gypsum products is about 70%. The reason is that excessive water is added to dilute the gypsum powder into a liquid gypsum slurry with sufficient fluidity, and the gypsum board is cast into a mold or belt mold through a face paper. Common products such as paper-faced gypsum board, fiber cloth-faced (paper-free) gypsum board, etc., usually have a hydration reaction time of 1-3 minutes, which is very fast. In the traditional gypsum board production process, the gypsum board is wet as a whole after curing and cannot be dried naturally in a short time. Therefore, the wet gypsum board needs to be heated and dried by a dryer. The drying process consumes a lot of electric heat energy or gas heat energy, and the drying cost accounts for about 50%-60% of the gypsum board production cost. If you want to reduce the drying cost, the theoretically feasible solution is to reduce the water consumption. However, when the water consumption is less than 70%, the viscosity of the gypsum slurry increases, the fluidity becomes lower, the hydration reaction is not complete, and the molding effect is difficult to control, so casting production cannot be carried out. Currently, there is a semi-dry production process on the market, which uses about 50% water, but can only produce small monomer gypsum profiles, such as gypsum blocks, and cannot produce large-sized continuous slabs.

[0003] The present invention designs a dry forming process and equipment for non-faced gypsum board, the actual water consumption can be controlled at about 20%, and the cooked gypsum powder is stirred with a low amount of water to become a semi-fluid paste, and then the dry manufacturing of gypsum board is realized through a three-stage extrusion molding and secondary water replenishment process. Due to the low water consumption, it is figuratively called dry forming. The upper and lower surfaces of the dry-formed gypsum board do not need to be covered with face paper or fiber cloth, the surface morphology of the board is dense, and the tensile and compressive strengths are higher than those of traditional paper-faced gypsum board and fiber gypsum board, which saves a lot of paper and can significantly reduce the drying cost. The length and width of the gypsum board manufactured by the present invention are comparable to those of traditional paper-faced gypsum board. It can be fireproof and waterproof without face paper, and can be directly used in low-intensity application scenarios such as simple partitions and space partitions. The main innovations of the process and equipment of the present invention include: the development of a low-water anti-adhesion stirring process and supporting mechanisms, the development of a paste slurry spreading process and supporting mechanisms, and the development of a three-stage continuous forming process and supporting mechanisms, which realizes a subversive innovation in the traditional gypsum board production technology. Summary of the invention

[0004] A dry forming process for unfaced gypsum board, characterized in that: Step 1, raw material mixing process: a mixing mechanism and a spraying device are set; by weight, the raw materials and the mixing ratio supplied to the mixing mechanism are: 100 parts of gypsum powder, 20 parts of process water, 0.3 parts of glass fiber, and 0.6 parts of retarder; the raw materials and the mixing ratio supplied to the spraying device are: 1 part of process water and 0.05 of accelerator; Step 2, raw material supply process: gypsum powder and glass fiber are respectively transported to the transfer bin of solid raw materials through a metering device, so that the glass fiber is mixed in the gypsum powder; the retarder and process water are respectively transported to the transfer water tank of liquid raw materials through a metering device, so that the retarder is pre-placed in the process water according to a proportion and mixed; and each raw material is continuously supplied to the mixing mechanism according to a proportion; Step 3, rapid mixing process: two feed ports are arranged on the top of the mixing mechanism to continuously receive solid raw materials; multiple water inlets are arranged on the top of the mixing mechanism, which are connected in parallel to the transfer water tank, and process water and retarder mixed liquid are continuously and evenly injected into the mixing mechanism at multiple points; Step 4, high-speed stirring process: in the mixing mechanism, high-speed stirring is performed to generate paste slurry, and the stirring process time is set to 10-15 seconds; two discharge ports are set at the bottom of the mixing mechanism, and the paste slurry continuously falls onto the mold belt by gravity, and the slurry falling time is set to 2-3 seconds; Step 5, slurry spreading process: a spreading mechanism is set to spread the slurry on the mold belt evenly, so that the height of the slurry is close to twice the rated thickness of the gypsum board; Step 6, three-stage continuous forming process: the first stage adopts the upper and lower extrusion structure of the first-stage pressure roller, and the forming thickness is close to 1.5 times the rated thickness of the gypsum board; the second stage adopts the second-stage elastic pressure roller group for extrusion forming, and the forming thickness is set to 1.1 times the rated thickness of the gypsum board; the third stage adopts the three-stage fixed pressure roller group for pressure holding forming, and the forming thickness is set to the rated thickness of the gypsum board; Step 7: Between the second and third molding processes, a secondary water replenishment process is provided, and a spray device is used to spray "process water + coagulant" on the upper surface of the gypsum board; Step 8, finishing process: the pressed and formed continuous length of gypsum board is conveyed along the roller conveyor, and at the same time, it is cut to a fixed length and trimmed in cross section. After passing the drying process, it is plastic-sealed and stacked.

[0005] A dry-process forming device for unfaced gypsum board, comprising: a forming mechanism, a spreading mechanism, a mixing mechanism, and a finishing mechanism; the forming mechanism, the spreading mechanism, and the mixing mechanism are sequentially connected from left to right, and the finishing mechanism is arranged on the left side of the forming mechanism and connected via a roller conveyor; The molding mechanism includes: a press frame, an upper belt, a driven roller, a mold belt, a power device, a belt cleaning device, an elastic vibration device, a guide roller group, a spray device, a deviation correction device, a release agent spraying device; a primary pressure roller, a secondary elastic pressure roller group, a tertiary fixed pressure roller group, a transmission roller group, and a support roller; The press frame is a rectangular column structure, the conveying roller group is horizontally arranged in the middle of the press frame, the right part of the conveying roller group is the feed end, and the left part is the plate outlet end; upper and lower cantilever beams are respectively arranged at the feed end, the left end of the cantilever beam is installed on the press frame, and the right end is suspended, wherein the upper cantilever beam is fixedly installed, and the lower cantilever beam is vertically adjustable in height, and the driven rollers are vertically arranged, respectively installed on the upper and lower cantilever beams; a plurality of guide roller groups are respectively arranged at the top and bottom of the press frame; two primary pressure rollers are arranged, which are vertically installed on the right column of the press frame; The power device comprises: a forming drive motor, a motor seat, a transmission chain plate, and an active roller; two active rollers are provided and vertically fixedly installed at the plate outlet end of the press frame; the motor seat is installed at the bottom of the press frame, and the forming drive motor is fixedly installed on it, and the two active rollers are driven to rotate synchronously in the opposite direction through the transmission chain plate; The mold belt is a continuous U-groove rotating belt, the inner groove height of the U-groove is equal to 2 times the thickness of the gypsum board, and the inner groove width is greater than or equal to 1.1 times the width of the gypsum board; the mold belt is tensioned and connected through the lower driven roller, the lower active roller, the lower first-level pressure roller and the bottom guide roller group; the upper belt is a flat belt, which is tensioned and connected through the upper driven roller, the upper active roller, the upper first-level pressure roller and the top guide roller group, and the width of the upper belt is equal to the inner groove width of the U-groove; the upper belt and the mold belt are horizontally laid on the conveying roller group in sequence from top to bottom, the upper belt is located in the U-groove of the mold belt, and the two belts are driven by the power device to rotate synchronously; The first-stage pressing roller, the second-stage elastic pressing roller group, and the third-stage fixed pressing roller group are sequentially arranged above the conveying roller group at the feeding end and the plate discharge end of the press frame, and are located above the upper belt. The upper belt between the second-stage elastic pressing roller group and the third-stage fixed pressing roller group is suspended upward by a supporting roller. A spray device is arranged longitudinally front and back below the suspended upper belt. The belt cleaning device, deviation correction device and release agent spraying device are arranged on the top of the press frame, and when the upper belt rotates, scraping cleaning, lateral deviation correction and release agent spraying on the outer surface of the upper belt are respectively performed.

[0006] A further solution is that the secondary elastic roller group includes: a left tensioning wheel, a short-range roller group, a single-joint fixed seat, and a flexible pressure-bearing body; a horizontal short-range roller group is connected to the lower part of the flexible pressure-bearing body, and a left tensioning wheel is arranged at the lower left corner; a group of single-joint fixed seats are arranged in the left and right directions, and each group is arranged in the front and rear directions. The lower end is fixed to the press frame, and the upper end is fixed to the flexible pressure-bearing body, and the height is adjustable; the elastic vibration device shown is an active excitation device, the upper end of which is installed on the top of the press frame 1-1, and the lower end is connected to the upper left corner of the single-joint fixed seat; The three-stage fixed pressure roller group includes: a long-distance roller group, a double fixed seat, a fixed pressure-bearing body, and a right tensioning wheel. A horizontal long-distance roller group is connected to the lower part of the rigid pressure-bearing body, and a right tensioning wheel is arranged at the lower right corner; two groups of double fixed seats are arranged in the left and right directions, and one roller is arranged in the front and rear of each group, the lower end of which is fixed on the press frame, and the upper end is fixed on the rigid pressure-bearing body, and the height is adjustable; The total left and right length of the short-range roller group is set to 40-50cm, and the molding thickness is set to 1.1 times the rated thickness of the gypsum board; the total left and right length of the long-range roller group is set to 80-100cm, and the molding thickness is set to the rated thickness of the gypsum board.

[0007] A further solution is that the mixing mechanism is arranged at the paste feeding end on the right side of the forming mechanism, and includes: a feeding port, a power transmission shaft, a stirring motor, a motor support, a stirring base, a stirring frame, a discharge chute, a stirring cylinder, a water injection device, a cage shaft, a lifting bracket, a cage seat, a stirring shaft, and a scraper; The mixing mechanism is an internally connected double-drum mixing mechanism with two mixing drums in parallel, a feed port is arranged on the top of the side end of each drum, a discharge port is arranged on the bottom of the other end, a discharge chute is arranged at the lower end of the two discharge ports, and the lower end of the discharge chute extends into the U-shaped groove on the upper surface of the mold belt at the right side of the feed end of the press frame; multiple groups of water injection devices are arranged on the top of the mixing drum; multiple mixing shafts are connected by fixed frames at both ends to form an integrally fixed cage shaft structure, and the center shaft and power transmission components are respectively arranged at the centers of the fixed frames at both ends of the cage shaft, and two groups of cage shafts are arranged in parallel and are respectively located in the two mixing drums, and the center shaft and power transmission components are located outside the end faces on both sides of the mixing drum, and the two groups of cage shafts are meshed and connected with each other through the power transmission component, and the center shafts at both ends of one group of cage shafts are simultaneously connected to the two ends of the power drive shaft 3-2 through the power transmission component; a scraper is fixedly installed next to each mixing shaft; The lower parts of the two mixing drums are integrally supported by a cage seat, and a lifting bracket is arranged at the lower part of the cage seat; a mixing machine frame is arranged beside the mixing drum, a mixing base is arranged on the upper part of the mixing machine frame, a motor support and a mixing motor are arranged on the mixing base, and a power transmission shaft is connected to the mixing motor drive.

[0008] A further solution is that the spreading mechanism is arranged between the flat belt at the slurry feeding end and the U-groove mold belt, and comprises: a fixed seat, a longitudinal scraper, a transverse drive motor, a synchronous pulley, a transverse guide rail, a transverse scraper, and a connecting seat; The paving mechanism is fixedly mounted on the lower cantilever beam through fixed seats at both ends. The longitudinal scraper is a static structure, and the bottom of the longitudinal scraper is set flush with the upper surface of the U-shaped groove of the mold belt; the transverse scraper is a dynamic mechanism, two of which are arranged horizontally and parallel, and are respectively mounted on transverse guide rails through connecting seats. The transverse drive motor drives the transverse guide rail through a synchronous pulley to drive the two transverse scrapers to reciprocate horizontally, and the bottom of the transverse scraper is flush with the upper surface of the U-shaped groove of the mold belt.

[0009] A further solution is that the belt cleaning device includes: a cleaning drive motor and a rotating roller brush; the upper belt and the rotating roller brush maintain contact, and the rotating roller brush scrapes and cleans the outer surface of the upper belt under the drive of the cleaning drive motor.

[0010] A further solution is that the correction device includes: an adjusting handle, an adjusting screw, and a correction roller; the upper belt is arranged on the correction roller, and the upper belt is corrected by the adjusting handle and the adjusting screw to ensure that the upper belt remains directly above the U-shaped groove of the mold belt.

[0011] A further solution is that the finishing mechanism includes a roller conveying device, a length cutting device, a cross-section trimming and cutting device, a drying device, and a plastic sealing and stacking device. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is the overall main view of the device; Figure 2 This is the front view of the molding press; Figure 3 It is the rear view of the molding press; Figure 4 Schematic diagram of the three-stage pressure plate mechanism Figure 5 This is a diagram of the power unit of the forming press; Figure 6 It is the main view of the mixing mechanism; Figure 7 This is the internal structure diagram of the mixing mechanism; Figure 8 It is a schematic diagram of the paving mechanism; Fig. 9 It is a schematic diagram of a belt cleaning device; Fig.10 Schematic diagram of the correction device. DETAILED DESCRIPTION

[0013] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application; The following description sets forth many specific details to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present application, so the present application is not limited to the specific embodiments disclosed below; It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or their combinations; In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0014] A dry forming process for unfaced gypsum board, characterized in that: Step 1, raw material mixing process: a mixing mechanism 3 and a spraying device 1-9 are set; by weight, the raw materials and the mixing ratio supplied to the mixing mechanism 3 are: 100 parts of gypsum powder, 20 parts of process water, 0.3 parts of glass fiber, and 0.6 parts of retarder; the raw materials and the mixing ratio supplied to the spraying device 1-9 are: 1 part of process water and 0.05 of accelerator; Step 2, raw material supply process: the gypsum powder and the glass fiber are respectively transported to the transfer bin of the solid raw material through the metering device, so that the glass fiber is mixed in the gypsum powder, and the retarder and the process water are respectively transported to the transfer water tank of the liquid raw material through the metering device, so that the retarder is pre-placed in the process water according to the proportion for mixing, and each raw material is continuously supplied to the mixing mechanism 3 according to the proportion; Step 3, rapid mixing process: two feed ports are arranged on the top of the mixing mechanism 3 to continuously receive solid raw materials; multiple water inlets are arranged on the top of the mixing mechanism 3, which are connected in parallel to the transfer water tank, and process water and retarder mixed liquid are continuously and evenly injected into the mixing mechanism at multiple points; Step four, high-speed stirring process: in the mixing mechanism 3, high-speed stirring is performed to generate slurry, and the stirring process time is set to 10-15 seconds; two discharge ports are set at the bottom of the mixing mechanism 3, and the slurry is continuously dropped onto the mold belts 1-4 by gravity, and the dropping time is set to 2-3 seconds. The upper limit value of the above-mentioned stirring and dropping process time is determined by a specific test of the gypsum curing time according to the process and equipment of the present invention, and the lower limit value is determined by a specific test of the gypsum molding effect. The specific optimized value can be determined by experiments based on the quality of the raw gypsum powder, the amount of process water and retarder added; Step 5, slurry spreading process: Set up a spreading mechanism 2 to spread the slurry on the mold belts 1-4 evenly, so that the height of the slurry is close to twice the rated thickness of the gypsum board. Traditional gypsum board molding uses liquid gypsum slurry with very good fluidity. The gypsum slurry can be spread more evenly due to its own gravity fluidity. The slurry in the present invention has very low water addition and poor fluidity, so an external spreading mechanism is required for active spreading to adjust the width and height of the slurry on the molding belt; Step 6, three-stage continuous forming process: the first stage adopts the upper and lower extrusion structure of the first-stage pressure roller 1-12, and the forming thickness is close to 1.5 times the rated thickness of the gypsum board; the second stage adopts the second-stage elastic pressure roller group 1-13 for extrusion forming, and the forming thickness is set to 1.1 times the rated thickness of the gypsum board; the third stage adopts the three-stage fixed pressure roller group 1-14 for pressure holding forming, and the forming thickness is set to the rated thickness of the gypsum board; the three-stage forming scheme can gradually release the internal stress of the board during extrusion, and the main body of the board is dense and uniform; Step 7: Between the second and third forming processes, a secondary water replenishment process is provided, and a spray device 1-9 is used to spray "process water + accelerator" on the upper surface of the gypsum board in a mist state, so that the curing reaction on the upper surface of the board is more sufficient and uniform, and the overall surface quality is high-quality, smooth, and free of tiny cracks; Step 8, finishing process: the pressed and formed continuous length of gypsum board is conveyed along the roller, and the fixed length cutting and cross-section trimming and cutting are carried out at the same time. After passing the drying process, the plastic sealing and stacking are carried out. The finishing process is a conventional technical solution. Due to the reduced water consumption, the energy consumption of the drying process is correspondingly reduced, and the drying process time is correspondingly accelerated.

[0015] A dry forming equipment for non-surfaced gypsum board, such as Figure 1As shown, it includes: a forming mechanism 1, a spreading mechanism 2, a mixing mechanism 3, and a sorting mechanism 4; the forming mechanism 1, the spreading mechanism 2, and the mixing mechanism 3 are connected in sequence from left to right, and the sorting mechanism 4 is arranged on the left side of the forming mechanism 1 and is connected through a roller.

[0016] The forming mechanism 1 is as follows Figure 2 As shown, it includes: a press frame 1-1, an upper belt 1-2, a driven roller 1-3, a mold belt 1-4, a power device 1-5, a belt cleaning device 1-6, an elastic vibration device 1-7, a guide roller group 1-8, a spray device 1-9, a deviation correction device 1-10, a release agent spraying device 1-11; a primary pressure roller 1-12, a secondary elastic pressure roller group 1-13, a tertiary fixed pressure roller group 1-14, a transmission roller group 1-15, and a support roller 1-16.

[0017] The press frame 1-1 is a rectangular column structure. Figure 2 As shown, the conveying roller group 1-15 is horizontally arranged through the middle of the press frame 1-1, the right part of the conveying roller group 1-15 is the feeding end, and the left part is the board outlet end; upper and lower cantilever beams are respectively arranged at the feeding end, the left end of the cantilever beam is installed on the press frame 1-1, and the right end is suspended, wherein the upper cantilever beam is fixedly installed, and the lower cantilever beam is vertically adjustable in height; two driven rollers 1-3 are vertically arranged, respectively installed on the upper and lower cantilever beams; a plurality of guide roller groups 1-8 are respectively arranged at the top and bottom of the press frame 1-1; two first-level pressing rollers 1-12 are arranged, vertically installed on the right column of the press frame 1-1, the upper first-level pressing roller is height-adjustable, and the lower first-level pressing roller is fixed, the vertical gap between the upper and lower first-level pressing rollers is 1-2 times the thickness of the gypsum board, and the upper and lower gaps of the two pressing rollers are adjustable.

[0018] The power devices 1-5 are as follows Figure 5 As shown, it includes: a forming drive motor 1-5-1, a motor base 1-5-2, a transmission chain plate 1-5-3, and an active roller 1-5-4; two active rollers 1-5-4 are provided, which are vertically fixedly installed at the plate outlet end of the press frame 1-1; the motor base 1-5-2 is installed at the bottom of the press frame 1-1, and the forming drive motor 1-5-1 is fixedly installed on it, and drives the two active rollers 1-5-4 to rotate synchronously in the opposite direction through the transmission chain plate 1-5-3.

[0019] The mold belt 1-4 is a continuous U-groove rotating belt, the inner groove height of the U-groove is equal to 2 times the thickness of the gypsum board, and the inner groove width is greater than or equal to 1.1 times the width of the gypsum board; the mold belt 1-4 is tensioned and connected by the lower driven roller, the lower active roller, the lower primary pressure roller and the bottom guide roller group; the upper belt 1-2 is a flat belt, such as Figure 2 and Figure 3As shown, the width of the upper belt 1-2 is equal to the inner width of the U-shaped groove through the tension connection of the upper driven roller 1-3, the upper active roller 1-5-4, the upper first-level pressure roller 1-12 and the top guide roller group 1-8; the upper belt 1-2 and the mold belt 1-4 are horizontally laid on the conveying roller group 1-15 in sequence from top to bottom, and the upper belt 1-2 is located in the U-shaped groove of the mold belt 1-4, and the two belts are driven to rotate synchronously by the power device 1-5.

[0020] like Figure 2 As shown, the first-level pressing roller 1-12, the second-level elastic pressing roller group 1-13, and the third-level fixed pressing roller group 1-14 are arranged in sequence above the conveying roller group 1-15 at the feed end and the plate outlet end of the press frame 1-1, and are located above the upper belt 1-2. The upper belt 1-2 between the second-level elastic pressing roller group 1-13 and the third-level fixed pressing roller group 1-14 is suspended upward by a supporting roller 1-16. Below the suspended upper belt 1-2, a spray device 1-9 is arranged longitudinally from front to back.

[0021] The belt cleaning device 1-6, the deviation correction device 1-10, and the release agent spraying device 1-11 are arranged on the top of the press frame 1-1, and when the upper belt 1-2 rotates, scraping cleaning, lateral deviation correction and release agent spraying on the outer surface of the upper belt are respectively performed.

[0022] like Figure 4 As shown, the secondary elastic pressure roller group 1-13 includes: a left tensioning wheel 1-13-1, a short-range pressure roller group 1-13-2, a single-joint fixed seat 1-13-3, and a flexible pressure-bearing body 1-13-4; a horizontal short-range pressure roller group 1-13-2 is connected to the lower part of the flexible pressure-bearing body 1-13-3, and a left tensioning wheel 1-13-1 is arranged at the lower left corner; a group of single-joint fixed seats 1-13-3 are arranged in the left and right directions, and each group is arranged with one in the front and rear directions, the lower end of which is fixed on the press frame 1-1, and the upper end is fixed on the flexible pressure-bearing body 1-13-4, and the height is adjustable; the elastic vibration device 1-7 shown is an active excitation device, the upper end of which is installed on the top of the press frame 1-1, and the lower end is connected to the upper left corner of the single-joint fixed seat 1-13-3.

[0023] The three-stage fixed pressure roller group 1-14 includes: a long-distance roller group 1-14-1, a double fixed seat 1-14-2, a fixed pressure-bearing body 1-14-3, and a right tensioning wheel 1-14-4. A horizontal long-distance roller group 1-14-1 is connected to the lower part of the rigid pressure-bearing body 1-14-3, and a right tensioning wheel 1-14-4 is arranged at the lower right corner; two groups of double fixed seats 1-14-2 are arranged in the left and right directions, and one roller is arranged at the front and back of each group. The lower end is fixed on the press frame 1-1, and the upper end is fixed on the rigid pressure-bearing body 1-14-3, and the height is adjustable.

[0024] The total left and right length of the short-range roller group 1-13-2 is set to 40-50cm, and the molding thickness is set to 1.1 times the rated thickness of the gypsum board; the total left and right length of the long-range roller group 1-14-1 is set to 80-100cm, and the molding thickness is set to the rated thickness of the gypsum board.

[0025] The mixing mechanism 3 is arranged at the paste feeding end on the right side of the forming mechanism 1. Figure 6 As shown, it includes: a feed inlet 3-1, a power transmission shaft 3-2, a stirring motor 3-3, a motor support 3-4, a stirring base 3-5, a stirring frame 3-6, a discharge chute 3-7, a stirring barrel 3-8, and a water injection device 3-9. Figure 7 As shown, it also includes: a cage shaft 3-10, a lifting bracket 3-11, a cage seat 3-12, a stirring shaft 3-13, and a scraper 3-14.

[0026] The mixing mechanism 3 is an internally connected double-drum mixing mechanism with two mixing drums 3-8 connected in parallel. A feed port 3-1 is arranged on the top of the side end of each drum, and a discharge port is arranged on the bottom of the other end. A discharge chute 3-7 is arranged at the lower end of each of the two discharge ports. The lower end of the discharge chute 3-7 extends into the U-shaped groove on the upper surface of the mold belt 1-4 at the right side of the feed end of the press frame 1-1; multiple groups of water injection devices 3-9 are arranged on the top of the mixing drum 3-8; multiple mixing shafts 3-13 are connected by the fixing frames at both ends to form an integral fixed cage. The cage shaft 3-10 structure has a central shaft and a power transmission component respectively arranged at the center of the two end fixing frames of the cage shaft 3-10, two sets of cage shafts 3-10 are arranged in parallel and are respectively located in the two mixing drums, the central shaft and the power transmission component are located outside the two side end surfaces of the mixing drum, the two sets of cage shafts 3-10 are meshed and connected with each other through the power transmission component, and the central shafts at both ends of one set of cage shafts 3-10 are simultaneously connected to the two ends of the power drive shaft 3-2 through the power transmission component; a scraper 3-14 is fixedly installed next to each mixing shaft 3-13.

[0027] The rotation radius of the cage shaft is 20-50mm lower than the inner diameter of the mixing drum. Both ends of the scraper and the mixing shaft are connected in a circumferential manner through fixed frames at both ends. The scraper blade is arranged to face outward, and the blade rotation radius is slightly smaller than the inner diameter of the mixing drum by 1-2mm; the center axes at both ends of the cage shaft 3-10 are simultaneously connected to the two ends of the power drive shaft 3-2 through power transmission components, that is, the power drive shaft 3-2 synchronously drives the two ends of the cage shaft 3-10. The reason is that the cage shaft 3-10 is a combined shaft structure rather than an integrated rigid shaft structure. The rigidity of the combined shaft structure is slightly poor. When the rotation resistance is large, if only the single-side center axis is driven, the overall rotation of the cage shaft 3-10 requires the rigidity of the mixing shaft itself to transmit power to the other end, which will cause unstable rotation and even deformation of the cage shaft 3-10 structure. The power drive shaft 3-2 synchronously drives the center axes at both ends of the cage shaft 3-10, and the cage shaft can maintain stable rotation in the drum.

[0028] The lower part of the two mixing drums 3-8 is integrally supported by a cage seat 3-12. Four lifting brackets 3-11 are respectively arranged at the four corners of the lower part of the cage seat, which are divided into two groups, front and rear, and controlled separately. By controlling the height difference of the two groups of brackets, the inclination of the mixing drum 3-8 is controlled, so that the paste inside the mixing drum 3-8 is sent downward by gravity and falls on the U-shaped groove of the mold belt 1-4 at the feed end. The greater the inclination and the faster the stirring speed, the faster the downward falling speed; a mixing machine frame 3-6 is arranged on the side of the mixing drum 3-8, a mixing base 3-5 is arranged on the upper part of the mixing machine frame, a motor support 3-4 and a mixing motor 3-3 are arranged on the mixing base, and a power transmission shaft 3-2 is connected to the mixing motor 3-3 for driving.

[0029] The spreading mechanism 2 is arranged between the flat belt at the slurry feeding end and the U-groove mold belt. Figure 8 As shown, it includes: a fixed seat 2-1, a longitudinal scraper 2-2, a transverse drive motor 2-3, a synchronous pulley 2-4, a transverse guide rail 2-5, a transverse scraper 2-6, and a connecting seat 2-7.

[0030] The paving mechanism 2 is fixedly mounted on the lower cantilever beam through the fixing seats 2-1 at both ends. The longitudinal scraper 2-2 is a static structure, and the bottom of the longitudinal scraper is set flush with the upper surface of the U-shaped groove of the mold belt 1-4. The transverse scraper 2-6 is a dynamic mechanism, and two transversely parallel scrapers are set, which are respectively mounted on the transverse guide rail 2-5 through the connecting seat 2-7. The transverse driving motor 2-3 drives the transverse guide rail 2-5 through the synchronous pulley 2-4 to drive the two transverse scrapers 2-6 to reciprocate horizontally, and the bottom of the transverse scraper 2-6 is flush with the upper surface of the U-shaped groove of the mold belt 1-4. The two transverse scrapers 2-6 are set to improve efficiency, and the stroke distance of each reciprocating translation is equal to half the width of the U-shaped groove.

[0031] The belt cleaning device 1-6 is as follows Fig. 9As shown, it includes: a cleaning drive motor 1-6-1, a rotating roller brush 1-6-2; the upper belt 1-2 and the rotating roller brush keep in contact, and the rotating roller brush scrapes and cleans the outer surface of the upper belt 1-2 under the drive of the cleaning drive motor 1-6-1. If water needs to be injected during cleaning, a wastewater collection device needs to be set.

[0032] The deviation correcting device 1-10 is as follows Fig.10 As shown, it includes: an adjustment handle 1-10-1, an adjustment screw 1-10-2, and a deviation correction roller 1-10-3; The upper belt 1-2 is arranged on the deviation correction roller 1-10-3, and the deviation of the upper belt 1-2 is corrected by adjusting the handle 1-10-1 and the adjusting screw 1-10-2 to ensure that the upper belt 1-2 remains directly above the U-shaped groove of the mold belt 1-4.

[0033] The finishing mechanism 4 includes a roller conveying device, a length cutting device, a cross-section trimming and cutting device, a drying device, and a plastic sealing and stacking device. The finishing mechanism is a well-known technology.

[0034] Embodiment 1, the working process of the mixing mechanism 3: The mixed gypsum powder and glass fiber in the transfer bin are continuously transported to the feed port 3-1 of the two mixing cylinders 3-8 of the mixing mechanism 3, and the process water and retarder are synchronously continuously injected into the cylinder from the multiple water injection devices 3-9 on the top of the mixing cylinder 3-8, so that the process water falls into the cylinder quickly and evenly. At the same time, the cage shaft 3-10 is driven to rotate by the power transmission shaft 3-2, and the mixing shaft 3-13 connected around the cage shaft 3-12 rotates to stir the gypsum powder, glass fiber, process water and retarder. Due to the low water addition amount, the stirred paste is in a semi-fluid state, and the stirring time is set to 10-15 seconds. The retarder plays a role in delaying the curing time, and the glass fiber plays a role in strengthening the strength and toughness of the board. Then adjust the height difference of the two groups of lifting brackets 3-11, and keep the mixing cylinder 3-8 in an inclined state, so that the paste inside the cylinder flows out from the discharge chute 3-7 to the U-shaped groove of the mold belt 1-4 under its own gravity, and the slurry falling time is set to 2-3 seconds. Since the viscosity of the paste is relatively high and the curing reaction time is very short, a scraper 3-14 device is provided to rotate synchronously with the stirring shaft 3-13 to scrape off the paste adhering to the inner wall of the mixing cylinder 3-8 in real time before the curing reaction, so as to prevent the paste from being firmly adhered to the inner wall after the curing reaction and being difficult to clean. The double-cylinder mixing mechanism is provided to achieve rapid mixing and stirring. Since the double cylinders are connected in parallel and internally, two sets of cage shafts 3-10 are required to rotate in parallel. Inside the middle connecting part of the double cylinders, such as Figure 7 As shown, the stirring shafts 3-13 on the two sets of cage shafts 3-10 may interfere and collide, so it is necessary to control the corresponding stirring shafts 3-13 to rotate alternately at the connecting point of the double cylinders; If the mixing mechanism 3 stops, it is necessary to flush the inside of the cylinder with a large amount of process water to flush out the residual paste before stopping. Otherwise, once it solidifies, the cylinder must be opened for hard cleaning; Driven by the power device 1-5, the upper belt 1-2 rotates clockwise, and the mold belt 1-4 rotates counterclockwise synchronously, driving the paste in the U-shaped groove to be transported to the paste feeding end of the molding mechanism 1; At the paste feeding end of the molding mechanism 1, it is composed of an upper belt 1-2 of two driven rollers 1-3 wrapped around the upper and lower cantilever beams and the right end of the mold belt 1-4. The lower cantilever beam is a vertical height adjustable structure, such as Figure 2 As shown, the right end driven roller in the lower group of driven rollers can be driven to adjust its height, so that the upper surface of the right part of the mold belt 1-4 and the upper surface of the lower first-level pressure roller can maintain an angle of -20° to -10°, that is, the feeding angle of the U-groove mold belt is between -20° and -10°. The slurry is transported obliquely upward, and the slurry's own gravity is downward. Therefore, the gravity of the slurry makes the semi-fluid slurry compacted, and at the same time it is convenient for the spreading mechanism 2 to spread the slurry smoothly, while the liquid slurry with good fluidity cannot be conventionally transported at a negative angle.

[0035] Embodiment 2, working process of the spreading mechanism 2 and the forming mechanism 1: Due to the poor fluidity of the paste, the paste needs to be initially spread and leveled in the U-shaped groove first. Therefore, when the paste reaches the feed end, the two horizontal scrapers 2-6 move back and forth horizontally to initially level the paste horizontally, and then the static vertical scraper 2-2 initially levels the paste vertically, so that the initial height of the paste is close to twice the rated thickness of the gypsum board. In order to prevent the horizontal scraper 2-6 and the vertical scraper 2-2 from adhering to too much paste and solidifying, the scraper can adopt an easy-to-replace structure and be quickly replaced regularly; After the paste is initially scraped and leveled by the spreading mechanism 2, it is transported to the position of the first-level roller 1-12. The upper first-level roller acts on the upper belt 1-2, and the lower first-level roller supports the mold belt 1-4. The paste is extruded and formed in the U-shaped groove. By setting the vertical gap between the upper and lower level rollers, the forming thickness is close to 1.5 times the rated thickness of the gypsum board. At this time, the paste is initially extruded into a flat plate shape. The primary forming is mainly to make the paste initially formed into a flat plate shape, but there are still loose pores inside, so that the process water can fully contact the gypsum, promoting a more thorough curing reaction; The initially formed flat panel is conveyed to the position of the secondary elastic pressure roller group. The secondary elastic pressure roller group 1-13 squeezes the flat panel through the upper belt 1-2, so that the thickness of the flat panel is squeezed to 1.1 times the rated thickness of the gypsum board. The flexible pressure-bearing body 1-13-4 and the press frame 1-1 are fixed by a single-joint fixing seat 1-13-3, that is, the connection between the secondary elastic pressure roller group 1-13 and the press frame 1-1 is a non-completely rigid single-point connection method. When the elastic vibration device 1-7 is excited, the secondary elastic pressure roller group 1-13 can produce an elastic vibration effect on the upper belt 1-2 and the lower flat panel, thereby greatly reducing the internal stress of the flat panel during the solidification reaction, improving the density of the panel body, and reducing tiny stress cracks. The flexible pressure-bearing body 1-13-4 itself is a rigid structure. Its flexibility refers to the fact that when the elastic vibration device 1-7 excites the flexible pressure-bearing body 1-13-4, the secondary elastic pressure roller group 1-13 has a small rotational swing amplitude, which is called flexibility; The flat board is transported to the position of the three-stage fixed roller group. The three-stage fixed roller group 1-14 squeezes the flat board through the upper belt 1-2, so that the thickness of the flat board is squeezed to the rated thickness of the gypsum board. The fixed pressure-bearing body 1-14-3 and the press frame 1-1 are fixed by a double fixed seat 1-14-2, which is a completely rigid two-point connection method to ensure the stability of the thickness of the output board. The fixed pressure-bearing body is named relative to the flexible pressure-bearing body, which is easy for technicians in the field to understand. The long-distance roller group 1-14-1 is relative to the short-distance roller group 1-13-2 of the secondary elastic roller group 1-13. The left and right total length of the long-distance roller group 1-14-1 is set longer, and the tertiary fixed roller group 1-14 has a better pressure-keeping effect on the upper belt 1-2 and the flat plate, ensuring the accurate thickness of the plate and the density of the plate body; the left and right total length of the short-distance roller group 1-13-2 is set shorter to highlight the better flexibility of the secondary elastic roller group 1-13 on the upper belt 1-2 and the flat plate; The support roller 1-16, the left tension wheel 1-13-1 and the right tension wheel 1-14-4 are suspended upward to lift the upper belt 1-2 between the secondary elastic pressure roller group 1-13 and the tertiary fixed pressure roller group 1-14. The spray device 1-9 is arranged under the upper belt 1-2 to spray process water and coagulant directly on the upper surface of the flat panel in a mist form, so that the curing reaction of the upper surface of the flat panel is more thorough, and the coagulant further promotes the curing reaction, so that when the flat panel passes through the tertiary pressure roller group 1-14, the upper surface is denser, smooth and free of cracks, so that the flat panel without facing paper can be directly used as an exterior decorative panel.

[0036] Embodiment 3, the working process of the finishing mechanism: The flat plate that has been continuously formed in three stages is transported to the plate outlet by the conveying roller group 1-15 and enters the sorting mechanism 4. During the transportation by the roller conveyor device, it passes through the length cutting device in turn to form a flat plate of rated length, and the two side edges of the flat plate are cut and trimmed to a flat plate of rated width. After entering the dryer for drying, it is plastic-sealed and stacked.

[0037] The automatic control technology in the present invention is a known technology, and the mechanical mechanism of the finishing mechanism is a known technology.

[0038] Advantages: The process of the present invention is complete, the water consumption is greatly reduced, and the mechanical device structure is ingenious, especially in the low-water anti-adhesion mixing process and the development of supporting mechanisms, the slurry spreading process and the development of supporting mechanisms, and the three-level continuous molding process and the development of supporting mechanisms, which have achieved disruptive innovation in the traditional gypsum board production technology.

Claims

1. A dry forming process for unfaced gypsum board, characterized in that: Step 1, raw material mixing process: a mixing mechanism (3) and a spraying device (1-9) are provided; the raw materials supplied to the mixing mechanism (3) and the mixing ratio are: 100 parts of gypsum powder, 20 parts of process water, 0.3 parts of glass fiber, and 0.6 parts of retarder by weight; The raw materials and mixing ratios supplied to the spraying device (1-9) are: 1 part of process water, 0.05 of coagulant; Step 2, raw material supply process: the gypsum powder and the glass fiber are respectively transported to the transfer bin of the solid raw material through the metering device, so that the glass fiber is mixed in the gypsum powder; the retarder and the process water are respectively transported to the transfer water tank of the liquid raw material through the metering device, so that the retarder is pre-placed in the process water according to a proportion for mixing; the solid raw material and the liquid raw material are continuously supplied to the mixing mechanism (3) according to a proportion; Step 3, rapid mixing process: two feed ports are arranged on the top of the mixing mechanism (3) to continuously receive solid raw materials; multiple water inlets are arranged on the top of the mixing mechanism (3) and connected in parallel to the transfer water tank, and the process water and the retarder mixed liquid are continuously and evenly injected into multiple points inside the mixing mechanism (3); Step 4, high-speed stirring process: in the mixing mechanism (3), high-speed stirring is performed to generate a paste slurry, and the stirring process time is set to 10-15 seconds; two discharge ports are provided at the bottom of the mixing mechanism (3), and the paste slurry continuously falls onto the mold belt (1-4) by gravity, and the slurry falling time is set to 2-3 seconds; Step 5, slurry spreading process: a spreading mechanism (2) is set to spread the slurry on the mold belt (1-4) evenly so that the height of the slurry is close to twice the rated thickness of the gypsum board; Step 6, three-stage continuous molding process: the first stage adopts a first-stage pressing roller (1-12) for extrusion molding, and the molding thickness is close to 1.5 times the rated thickness of the gypsum board; the second stage adopts a second-stage elastic pressing roller group (1-13) for extrusion molding, and the molding thickness is set to 1.1 times the rated thickness of the gypsum board; the third stage adopts a three-stage fixed pressing roller group (1-14) for pressure holding molding, and the molding thickness is set to the rated thickness of the gypsum board; Step 7: between the second and third forming processes, a secondary water replenishment process is provided, and a spray device (1-9) is used to spray "process water + coagulant" onto the upper surface of the gypsum board; Step 8, finishing process: the pressed and formed continuous length of gypsum board is conveyed along the roller conveyor, and at the same time, it is cut to a fixed length and trimmed in cross section. After passing the drying process, it is plastic-sealed and stacked.

2. A dry forming equipment for non-surfaced gypsum board, characterized in that: include: A forming mechanism (1), a spreading mechanism (2), a mixing mechanism (3), and a finishing mechanism (4); the forming mechanism (1), the spreading mechanism (2), and the mixing mechanism (3) are sequentially connected from left to right, and the finishing mechanism (4) is arranged on the left side of the forming mechanism (1) and is connected via a roller conveyor; The molding mechanism (1) comprises: a press frame (1-1), an upper belt (1-2), a driven roller (1-3), a mold belt (1-4), a power device (1-5), a belt cleaning device (1-6), an elastic vibration device (1-7), a guide roller group (1-8), a spray device (1-9), a deviation correction device (1-10), a mold release agent spraying device (1-11); a first-level pressing roller (1-12), a second-level elastic pressing roller group (1-13), a third-level fixed pressing roller group (1-14), a transmission roller group (1-15), and a support roller (1-16); The press frame (1-1) is a rectangular column structure, the conveying roller group (1-15) is horizontally arranged in the middle of the press frame (1-1), the right part of the conveying roller group (1-15) is the feeding end, and the left part is the plate outlet end; upper and lower cantilever beams are respectively arranged at the feeding end, the left end of the cantilever beam is installed on the press frame (1-1), and the right end is suspended; two driven rollers (1-3) are vertically arranged and respectively installed on the upper and lower cantilever beams; a plurality of guide roller groups (1-8) are respectively arranged at the top and bottom of the press frame (1-1); two primary pressing rollers (1-12) are arranged and vertically installed on the right column of the press frame (1-1); The power device (1-5) comprises: a forming drive motor (1-5-1), a motor seat (1-5-2), a transmission chain plate (1-5-3), and an active roller (1-5-4); two active rollers (1-5-4) are provided and vertically fixedly installed at the plate outlet end of the press frame (1-1); the motor seat (1-5-2) is installed at the bottom of the press frame (1-1), and the forming drive motor (1-5-1) is fixedly installed on it, and drives the two active rollers (1-5-4) to rotate synchronously in opposite directions through the transmission chain plate (1-5-3); The mold belt (1-4) is a continuous U-groove rotating belt, and the mold belt (1-4) is tensioned and connected through a lower driven roller, a lower active roller, a lower first-level pressure roller, and a bottom guide roller group; the upper belt (1-2) is a flat belt, and is tensioned and connected through an upper driven roller (1-3), an upper active roller (1-5-4), an upper first-level pressure roller (1-12), and a top guide roller group (1-8); the upper belt (1-2) and the mold belt (1-4) are horizontally laid on the conveying roller group (1-15) in sequence from top to bottom, and the upper belt (1-2) is located in the U-groove of the mold belt (1-4), and the two belts are driven to rotate synchronously by a power device (1-5); The first-stage pressing roller (1-12), the second-stage elastic pressing roller group (1-13), and the third-stage fixed pressing roller group (1-14) are sequentially arranged above the conveying roller group (1-15) at the feeding end and the plate discharge end of the press frame (1-1), and are located above the upper belt (1-2). The upper belt (1-2) between the second-stage elastic pressing roller group (1-13) and the third-stage fixed pressing roller group (1-14) is suspended upward by a supporting roller (1-16). A spray device (1-9) is arranged longitudinally in the front and rear directions below the suspended upper belt (1-2).

3. The dry forming equipment for unfaced gypsum board according to claim 2, characterized in that: The belt cleaning device (1-6), the deviation correcting device (1-10), and the mold release agent spraying device (1-11) are arranged on the top of the press frame (1-1).

4. The dry forming equipment for unfaced gypsum board according to claim 2, characterized in that: The secondary elastic roller group (1-13) comprises: a left tensioning wheel (1-13-1), a short-range roller group (1-13-2), a single-joint fixed seat (1-13-3), and a flexible pressure-carrying body (1-13-4); a horizontal short-range roller group (1-13-2) is connected to the lower part of the flexible pressure-carrying body (1-13-3), and a left tensioning wheel (1-13-1) is arranged at the lower left corner; a group of the single-joint fixed seat (1-13-3) is arranged in the left and right directions, and each group is arranged with one roller in the front and rear directions, the lower end of which is fixed on the press frame (1-1), and the upper end is fixed on the flexible pressure-carrying body (1-13-4), and the height is adjustable; the elastic vibration device (1-7) is an active excitation device, the upper end of which is installed on the top of the press frame (1-1), and the lower end is connected to the upper left corner of the single-joint fixed seat (1-13-3); The three-stage fixed pressure roller group (1-14) comprises: a long-distance roller group (1-14-1), a double fixed seat (1-14-2), a fixed pressure-bearing body (1-14-3), and a right tensioning wheel (1-14-4); a horizontal long-distance roller group (1-14-1) is connected to the lower part of the rigid pressure-bearing body (1-14-3), and a right tensioning wheel (1-14-4) is arranged at the lower right corner; two groups of double fixed seats (1-14-2) are arranged in the left and right directions, and one roller is arranged in each group in the front and rear, the lower end of which is fixed on the press frame (1-1), and the upper end is fixed on the rigid pressure-bearing body (1-14-3), and the height is adjustable.

5. The dry forming equipment for unfaced gypsum board according to claim 2, characterized in that: The mixing mechanism (3) is arranged at the paste feeding end on the right side of the forming mechanism (1), and comprises: a feeding port (3-1), a power transmission shaft (3-2), a stirring motor (3-3), a motor support (3-4), a stirring base (3-5), a stirring frame (3-6), a discharge slide (3-7), a stirring barrel (3-8), a water injection device (3-9), a cage shaft (3-10), a lifting bracket (3-11), a cage seat (3-12), a stirring shaft (3-13), and a scraper (3-14); The mixing mechanism (3) is an internally connected double-drum mixing mechanism with two mixing drums (3-8) connected in parallel. A feed port (3-1) is provided at the top of each drum side end, and a discharge port is provided at the bottom of each other end. A discharge chute (3-7) is provided at the lower end of the two discharge ports. The lower end of the discharge chute (3-7) extends into a U-shaped groove on the upper surface of the mold belt (1-4) at the right side of the feed end of the press frame (1-1). A plurality of water injection devices (3-9) are provided at the top of the mixing drum (3-8). A plurality of mixing shafts (3-13) are connected in a circumferential manner through fixing frames at both ends to form an integrally fixed cage shaft ( 3-10) structure, a central shaft and a power transmission component are respectively arranged at the center of the two end fixing frames of the cage shaft (3-10), two sets of cage shafts (3-10) are arranged in parallel and are respectively located in two mixing drums (3-8), the central shaft and the power transmission component are located outside the end surfaces of both sides of the mixing drum (3-8), the two sets of cage shafts (3-10) are meshed and connected with each other through the power transmission component, and the central shafts at both ends of one set of cage shafts (3-10) are simultaneously connected to the two ends of the power drive shaft (3-2) through the power transmission component; a scraper (3-14) is fixedly installed next to each mixing shaft (3-13); The lower parts of the two mixing drums (3-8) are integrally supported by a cage seat (3-12), and a lifting bracket (3-11) is arranged at the lower part of the cage seat; a mixing machine frame (3-6) is arranged beside the mixing drum (3-8), a mixing base (3-5) is arranged on the upper part of the mixing machine frame, a motor support (3-4) and a mixing motor (3-3) are arranged on the mixing base, and a power transmission shaft (3-2) is connected to the mixing motor (3-3) for driving.

6. The dry forming equipment for unfaced gypsum board according to claim 2, characterized in that: The spreading mechanism (2) is arranged between the flat belt at the slurry feeding end and the U-groove mold belt, and comprises: a fixed seat (2-1), a longitudinal scraper (2-2), a transverse drive motor (2-3), a synchronous pulley (2-4), a transverse guide rail (2-5), a transverse scraper (2-6), and a connecting seat (2-7); The spreading mechanism (2) is fixedly mounted on the lower cantilever beam via fixed seats (2-1) at both ends; the longitudinal scraper (2-2) is a static structure, and the bottom of the longitudinal scraper is arranged to be flush with the upper surface of the U-shaped groove of the mold belt (1-4); the transverse scraper (2-6) is a dynamic mechanism, and is mounted on the transverse guide rail (2-5) via a connecting seat (2-7); the transverse drive motor (2-3) drives the transverse guide rail (2-5) via a synchronous pulley (2-4) to drive the transverse scraper (2-6) to reciprocate laterally, and the bottom of the transverse scraper (2-6) is flush with the upper surface of the U-shaped groove of the mold belt (1-4).

7. The dry forming equipment for unfaced gypsum board according to claim 2, characterized in that: The belt cleaning device (1-6) comprises: a cleaning drive motor (1-6-1) and a rotating roller brush (1-6-2); the upper belt (1-2) and the rotating roller brush are in contact with each other, and the rotating roller brush scrapes and cleans the outer surface of the upper belt (1-2) under the drive of the cleaning drive motor (1-6-1).

8. The dry forming equipment for unfaced gypsum board according to claim 2, characterized in that: The deviation correction device (1-10) comprises: an adjustment handle (1-10-1), an adjustment screw (1-10-2), and a deviation correction roller (1-10-3); the upper belt (1-2) is arranged on the deviation correction roller (1-10-3), and the deviation of the upper belt (1-2) is corrected by the adjustment handle (1-10-1) and the adjustment screw (1-10-2), so as to ensure that the upper belt (1-2) is kept directly above the U-shaped groove of the mold belt (1-4).

9. The dry forming equipment for unfaced gypsum board according to claim 2, characterized in that: The finishing mechanism (4) comprises a roller conveying device, a length cutting device, a cross-section trimming and cutting device, a drying device, and a plastic sealing and stacking device.

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