Method and device for recycling gypsum board sawing edge waste

Abstract

The application discloses a gypsum board saw edge waste recycling method and device, wherein the device comprises a crushing part, a drying part, a grinding part and a centrifugal screening part arranged in sequence along the transmission direction; after the gypsum board saw edge waste is crushed by the crushing part and dried by the drying part to remove water, the gypsum block is crushed into powder by the grinding part in sequence, and finally the gypsum powder is separated from the facing paper by the centrifugal screening part. The application fully utilizes the characteristics of the different hardness and brittleness of the gypsum and the facing paper in the gypsum board saw edge waste, dries the gypsum board waste fragments first, then crushes them fully, crushes the gypsum into powder, and thus the gypsum falls off from the facing paper, so that the gypsum on the gypsum board saw edge waste can be completely separated from the facing paper, the gypsum remaining on the facing paper is avoided, and the utilization rate of the gypsum and the facing paper in the waste is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gypsum board production, in particular to a gypsum board sawing edge waste recycling method and device. BACKGROUND

[0002] In the production and processing process of gypsum board, a large amount of edge and corner materials will be generated, and the gypsum board production waste is mainly generated during the sawing operation in the production process of gypsum board. The gypsum board sawing edge waste includes a board core and a facing paper attached to the upper and lower surfaces of the board core. Gypsum board waste recycling is a way of resource recycling, which aims to reduce waste emissions, save resources and achieve sustainable development.

[0003] At present, the recycling method of gypsum board sawing edge waste is to crush the gypsum board and then separate the facing paper, collect and then reuse. However, due to the characteristics of the facing paper, such as good flexibility, high strength and wear resistance, there is still gypsum adhered to the treated facing paper, which causes waste of gypsum and affects subsequent reuse.

[0004] Therefore, the existing gypsum board sawing edge waste recycling method cannot completely separate gypsum from the facing paper, which is easy to cause gypsum residue.

[0005] In addition, the existing gypsum board sawing edge waste recycling device cannot completely separate gypsum from the facing paper, which is easy to cause gypsum residue, resulting in resource waste and affecting subsequent resource reuse. SUMMARY

[0006] The purpose of the present application is to provide a gypsum board sawing edge waste recycling method and device to solve the technical problem that the gypsum board sawing edge waste recycling method and device in the prior art cannot completely separate gypsum from the facing paper.

[0007] To solve the above technical problems, the present application specifically provides the following technical solutions:

[0008] In the first aspect of the present application, a gypsum board sawing edge waste recycling device is provided, which comprises a crushing part, a drying part, a crushing part and a centrifugal screening part arranged in sequence along the transmission direction; wherein,

[0009] The crushing part comprises two symmetrical crushing rollers, which crush the gypsum board sawing edge waste into blocks when the two crushing rollers rotate simultaneously towards the middle direction;

[0010] The drying part comprises a drying box and a conveying belt arranged inside the drying box, and the conveying belt is used to convey the crushed gypsum board waste into the drying box for drying;

[0011] The crushing part includes two symmetrically arranged crushing plates, so that the two crushing plates crush the dried gypsum when moving relative to each other, so that the gypsum falls off from the facing paper;

[0012] The centrifugal screening part includes a rotating screen and a feeding part arranged between the screen and the crushing plates, the crushed gypsum board waste is fed into the screen through the feeding part, and the centrifugal force generated by the rotating screen throws the crushed gypsum, so as to separate the gypsum from the facing paper.

[0013] Wherein, the gypsum board sawing waste is crushed and dried by the crushing part and the drying part, and then the gypsum block is crushed into powder by the crushing part, and finally the gypsum powder is separated from the facing paper by the centrifugal screening part.

[0014] Further, the two crushing plates are symmetrically arranged in the left-right direction, and the two crushing plates repeatedly move in opposite directions or rotate around the center of the crushing plate when crushing the dried gypsum.

[0015] A crushing block is fixedly connected to the side opposite to the two crushing plates, so that the crushing block continuously presses the dried gypsum board waste when the two crushing plates move relative to each other, thereby crushing the gypsum therein.

[0016] A guide plate is arranged between the conveying belt and the crushing plate, so that the dried gypsum board waste falls between the two crushing plates under the guide of the guide plate.

[0017] Further, a grinding part for grinding the gypsum board waste is arranged between the crushing part and the centrifugal screening part, so that the gypsum in the waste is ground into smaller particles and completely falls off from the facing paper, the grinding part includes a cylindrical shell and a rotating shaft arranged inside the shell, a plurality of self-rotating grinding rollers are mounted on the outer surface of the rotating shaft, and the outer surface of the grinding roller is fitted with the inner wall of the shell, so that the rotating shaft drives the grinding roller to rotate along the inner wall of the shell, and the grinding roller rotates to grind the gypsum board waste inside the shell.

[0018] Further, an opening is formed at the top of the shell, and an outlet is formed at the bottom of the shell, the opening is arranged directly below the two crushing plates, and a guide plate is arranged on both sides of the opening to guide the gypsum board waste to fall into the shell, and a detachable sealing plate is arranged on the outlet.

[0019] The grinding roller is provided with a mounting bracket, and a support plate corresponding to the grinding roller is fixedly connected to the outer surface of the rotating shaft, a telescopic rod is fixedly connected between the mounting bracket and the support plate, and a first spring is arranged on the outer surface of the telescopic rod, and the two ends of the first spring are fixedly connected with the support plate and the mounting bracket.

[0020] When the grinding roller contacts the inner wall of the shell, the first spring is compressed, and when the grinding roller passes through the opening, the first spring is stretched due to the rebounding force, so that the grinding roller moves away from the shell, and then the grinding roller is guided by the guide plate to contact the inner wall of the shell again.

[0021] Further, a connecting rod is fixedly connected to one side of the support plate, one end of the connecting rod away from the support plate is fixedly connected with a shovel plate, the shovel plate is matched with the inner wall of the shell, so that the support plate drives the shovel plate to rotate when the support plate rotates, thereby shoveling the ground gypsum board waste and throwing the gypsum board waste down with the rotation of the shovel plate, so that the large-size particles in the gypsum board waste fall on the top of the small-size particles.

[0022] Further, a rotating rod is arranged inside the screen, a plurality of long rods made of soft plastic material are connected to the outer surface of the rotating rod, the long rods can be deformed under stress, so that the long rods rotate when the rotating rod rotates, thereby making the ground and bunched face paper adhere between the plurality of long rods.

[0023] Further, a cylinder is clamped on the outer surface of the rotating rod through a clamping block and a clamping groove, a fixed shell is arranged on the outer surface of the cylinder, a second spring is fixedly connected between the fixed shell and the cylinder, the fixed shell is matched with the outer surface of the cylinder through the elastic force of the second spring, a group of long rods are slidably connected in the fixed shell, and one end of the long rods is fixedly connected with the cylinder, the centrifugal force generated when the rotating rod rotates makes the fixed shell move away from the cylinder and slide along the long rods, thereby removing the bunched face paper adhered on the long rods.

[0024] Further, each group of long rods contains a plurality of long rods, an elastic block is arranged on the outer surface of each group of long rods, a plurality of through holes are formed in the elastic block, and one long rod is arranged in each through hole, and a fixed cylinder is fixedly connected to the outer surface of the elastic block, and one end of the fixed cylinder is fixedly connected with the fixed shell.

[0025] In the second aspect of the present application, a gypsum board edge sawing waste recycling method is provided, which adopts the gypsum board edge sawing waste recycling device, and includes the following steps:

[0026] The gypsum board edge sawing waste is crushed into blocks;

[0027] The crushed gypsum board waste is dried;

[0028] The gypsum in the dried gypsum board waste is crushed into powder, so that the gypsum falls off from the face paper;

[0029] The fallen gypsum powder and the residual face paper are separated through centrifugal screening.

[0030] Further, during the crushing process of the dried gypsum board waste, the gypsum in the gypsum board waste is gradually crushed into powder, and the facing paper in the gypsum board waste is gradually crushed into fluffy and lump-shaped.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] The recycling device and method provided by the present application make full use of the different characteristics of the hardness and brittleness of the gypsum and the facing paper in the gypsum board saw edge waste, dry the gypsum board waste fragments first, then crush them fully, crush the gypsum into powder, and thereby fall off from the facing paper, so that the gypsum on the gypsum board saw edge waste can be completely separated from the facing paper, the gypsum left on the facing paper is avoided, and the utilization rate of the gypsum and the facing paper in the waste is improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can also be obtained from the provided drawings without creative labor.

[0034] Figure 1 is a structural schematic diagram of the present application;

[0035] Figure 2 is a structural schematic diagram of the grinding part of the present application;

[0036] Figure 3 is a connection structure schematic diagram of the rotating rod and the fixed shell of the present application;

[0037] Figure 4 is a connection structure schematic diagram of a group of long rods and elastic blocks of the present application.

[0038] The numbers in the drawings represent the following respectively:

[0039] 10 - crushing part; 20 - drying part; 30 - crushing part; 40 - centrifugal screening part; 50 - grinding part; 60 - grinding roller;

[0040] 11 - crushing roller;

[0041] 21 - drying box; 22 - conveying belt;

[0042] 31 - crushing plate; 32 - crushing block; 33 - guide plate;

[0043] 41 - screen; 42 - feeding part; 43 - rotating rod; 44 - long rod; 45 - cylinder; 46 - fixed shell; 47 - second spring; 48 - elastic block; 49 - fixed cylinder;

[0044] 51-Shell; 52-Rotating shaft; 53-Sealing plate; 54-Opening; 55-Outlet; 56-Guide plate;

[0045] 61-Mounting bracket; 62-Support plate; 63-Telescopic rod; 64-First spring; 65-Connecting rod; 66-Scrap plate. Detailed Implementation

[0046] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] like Figure 1 and Figure 2 As shown, the present invention provides a device for recycling and reusing waste from gypsum board sawing. It mainly separates the gypsum on the waste from the facing paper by drying and crushing the gypsum board fragments.

[0048] The recycling and reuse device includes a crushing section 10, a drying section 20, a grinding section 30, and a centrifugal screening section 40 arranged sequentially along the conveying direction; wherein,

[0049] The crushing section 10 includes two symmetrically arranged crushing rollers 11. When the two crushing rollers 11 rotate simultaneously toward the center, they crush the gypsum board sawing waste into blocks.

[0050] The drying section 20 includes a drying box 21 and a conveyor belt 22 disposed inside the drying box 21. The conveyor belt 22 is used to transport the gypsum board waste material crushed into blocks into the drying box 21 for drying.

[0051] The crushing section 30 includes two symmetrically arranged crushing plates 31, which crush the dried gypsum when the two crushing plates 31 move relative to each other, thereby causing the gypsum to fall off the protective paper.

[0052] The centrifugal screening section 40 includes a rotating screen 41 and a feeding section 42 disposed between the screen 41 and the grinding plate 31. The crushed gypsum board waste is fed into the screen 41 through the feeding section 42. The centrifugal force generated by the rotating screen 41 throws the crushed gypsum out, thereby separating the gypsum from the facing paper.

[0053] In this process, the waste material from sawing the gypsum board is crushed by the crushing section 10 and dried by the drying section 20 to remove moisture. Then, it is crushed into powder by the grinding section 30 and finally separated from the facing paper by the centrifugal sieve section 40.

[0054] At present, in the recycling of gypsum board saw edge waste, only by crushing to separate the gypsum and the facing paper, but due to the toughness of the facing paper, the gypsum still adheres to the treated facing paper, causing waste of gypsum and affecting subsequent reuse, therefore, it is necessary to develop a device that can completely separate the gypsum and the facing paper.

[0055] The present embodiment makes full use of the different characteristics of the hardness and brittleness of the gypsum and the facing paper in the gypsum board saw edge waste, first dries and then fully crushes the gypsum board waste fragments, and grinds the gypsum into powder, so that it falls off from the facing paper, which can completely separate the gypsum on the gypsum board saw edge waste from the facing paper, avoid the residual gypsum on the facing paper, and improve the utilization rate of gypsum and facing paper in the waste.

[0056] The hardness and brittleness of the gypsum and the facing paper in the gypsum board saw edge waste are very different. Gypsum is a relatively hard and brittle mineral material, while the facing paper is a cellulose product with high flexibility and high strength, wear resistance and crack resistance. In the case of common grinding, gypsum will be ground into powder faster than facing paper.

[0057] The present application makes full use of the different characteristics of the hardness and brittleness of the two materials. Gypsum is easy to be ground into fine particles and even powder due to its hardness and brittleness when treated by appropriate crushing and grinding equipment. In contrast, it is difficult for the facing paper to be ground into fine fragments and powder. After high-intensity grinding, the facing paper is more likely to be ground into fibers rather than real powder, because the fiber structure of the paper will be pulled during the grinding process rather than broken into powder like gypsum. Therefore, if gypsum and facing paper are put into the grinder together for grinding, gypsum will be ground into powder faster, while the facing paper will tend to be torn into fluffy and clumped paper scraps.

[0058] In actual use, 1. The gypsum board saw edge waste is placed between the two crushing rollers 11, so that it is crushed into blocks;

[0059] 2. The crushed gypsum board waste is conveyed to the inside of the drying box 21 by the conveying belt 22 for drying;

[0060] 3. The two grinding plates 31 are moved relatively, and the dried gypsum board fragments fall between the two grinding plates 31 from top to bottom, and the grinding plates 31 crush the gypsum in the dried gypsum board waste into powder, so that the gypsum falls off from the facing paper;

[0061] 4. The screen 41 is rotated, the crushed waste is conveyed into the screen 41, and the separated gypsum powder and the residual facing paper are separated by centrifugal screening.

[0062] The raw gypsum powder obtained after centrifugal screening is ground to a specific surface area of 9000-15000 cm2 / g, which can be used as a setting accelerator for producing gypsum board. The paper scraps obtained after screening are fed into a mixing reamer through a metering conveying device, and the paper scraps are mixed with fuel for combustion to provide part of the heat source for the production line, achieving zero solid waste discharge. The paper scraps ground to fluffy clumps can be fully combusted to provide sufficient heat energy and improve the utilization rate.

[0063] Specifically, the specific structure of the crushing part 30 is as shown in the figure, two said crushing plates 31 are symmetrically arranged in the left-right direction, and when crushing the dried gypsum, the two said crushing plates 31 repeatedly move in opposite directions or rotate around the center of the crushing plate 31. Figure 1

[0064] A crushing block 32 is fixedly connected to the side opposite to the two said crushing plates 31, so that when the two said crushing plates 31 move relative to each other, the crushing block 32 continuously presses the dried gypsum board waste against each other, thereby crushing the gypsum therein.

[0065] A guide plate 33 is arranged between the conveying belt 22 and the crushing plate 31, so that the dried gypsum board waste falls between the two said crushing plates 31 under the guidance of the guide plate 33.

[0066] The block-shaped gypsum board waste falls from top to bottom into the two crushing plates 31, and the relative movement between the crushing plates 31 applies a pressing force to the gypsum through the crushing block 32, so that the gypsum is crushed and the facing paper is rubbed.

[0067] In order to make the gypsum particles smaller and more completely separated from the facing paper, further, as shown in the figure, a grinding part 50 for grinding the gypsum board waste is arranged between the crushing part 30 and the centrifugal screening part 40, so that the gypsum in the waste is ground into smaller particles and completely separated from the facing paper, the grinding part 50 includes a cylindrical housing 51 and a rotating shaft 52 arranged inside the housing 51, a plurality of self-rotating grinding rollers 60 are mounted on the outer surface of the rotating shaft 52, and the outer surface of the grinding roller 60 is in close contact with the inner wall of the housing 51, so that when the rotating shaft 52 rotates, the grinding roller 60 rotates along the inner wall of the housing 51, and the grinding roller 60 rotates to grind the gypsum board waste inside the housing 51. Figure 2 When the grinding roller 60 rotates along the inner wall of the housing 51, the waste inside the housing 51 is crushed by the grinding roller 60, so that the gypsum particles become smaller and smaller, and the facing paper, due to its high toughness, will not easily break, but will only be ground into fluffy clumps, so that the size of the facing paper is larger, which is beneficial to subsequent screening.

[0068]

[0069] ​​Specifically, the specific structure of the shell 51 is that an opening 54 is arranged at the top of the shell 51, an outlet 55 is arranged at the bottom of the shell 51, the opening 54 is arranged directly below the two grinding plates 31, and a guide plate 56 for guiding the gypsum board waste to fall into the shell 51 is arranged on both sides of the opening 54, and the outlet 55 is provided with a detachable sealing plate 53; the gypsum board waste enters from the opening 54 of the shell 51, and after the grinding is completed, the sealing plate 53 is opened, and the ground material body reaches the inside of the centrifugal screening part 40 from the outlet 55.

[0070] The grinding roller 60 is provided with a mounting frame 61, a support plate 62 corresponding to the grinding roller 60 is fixedly connected to the outer surface of the rotating shaft 52, a telescopic rod 63 is fixedly connected between the mounting frame 61 and the support plate 62, and a first spring 64 is arranged on the outer surface of the telescopic rod 63, and the two ends of the first spring 64 are fixedly connected with the support plate 62 and the mounting frame 61 respectively.

[0071] When the grinding roller 60 contacts the inner wall of the shell 51, the first spring 64 is compressed, and when the grinding roller 60 passes through the opening 54, the first spring 64 is stretched due to the rebounding force, so that the grinding roller 60 moves away from the shell 51, and then the grinding roller 60 is guided by the guide plate 56 to contact the inner wall of the shell 51 again.

[0072] By arranging the first spring 64 and the telescopic rod 63, the grinding roller 60 is always in close contact with the inner wall of the shell 51, and the grinding roller 60 also rotates when rotating along the inner wall of the shell 51, thereby improving the grinding efficiency. Meanwhile, the guide plate 56 not only guides the gypsum board waste, but also guides the grinding roller 60 to enter the inner wall of the shell 51. When the grinding roller 60 passes through the opening 54, the first spring 64 is stretched due to the rebounding force, so that the grinding roller 60 moves away from the shell 51. With the rotation of the grinding roller 60, the grinding roller 60 is again in close contact with the inner wall of the shell 51 under the guidance of the guide plate 56.

[0073] With the rotation and grinding of the grinding roller 60, the material body at the bottom of the inner wall of the shell 51 is compacted, thereby affecting the grinding of the gypsum. In order to solve this problem, further, a connecting rod 65 is fixedly connected to one side of the support plate 62, one end of the connecting rod 65 away from the support plate 62 is fixedly connected with a shovel plate 66, and the shovel plate 66 is matched with the inner wall of the shell 51, so that the support plate 62 drives the shovel plate 66 to rotate in close contact with the inner wall of the shell 51 when rotating, thereby shoveling the ground gypsum board waste and throwing the gypsum board waste with the rotation of the shovel plate 66, so that the large-size particles in the gypsum board waste fall on the top of the small-size particles.

[0074] With the rotation of the support plate 62, the shovel plate 66 is rotated, and after the grinding of the grinding roller 60, the corresponding shovel plate 66 of the grinding roller 60 can shovel the ground material, and then the shovel plate 66 can throw the ground material with the rotation of the support plate 62, so that the thrown material is more fluffy, and the larger size gypsum particles are covered on the smaller size gypsum particles, so that the gypsum particles can be orderly ground into powder, and the grinding efficiency is improved.

[0075] As a preferred embodiment, as shown in Figure 1 and Figure 3 , a rotating rod 43 is arranged inside the screen 41, and a plurality of long rods 44 made of soft plastic material are connected to the outer surface of the rotating rod 43. The long rods 44 can be deformed under stress, so that the long rods 44 are rotated with the rotation of the rotating rod 43, so that the fluffy and bunched face paper adheres between the plurality of long rods 44. After the grinding of the grinding roller 60, the face paper has been ground into fluffy and bunched shape, which is relatively larger in size and lighter in weight than gypsum powder. The fluffy and bunched face paper is grabbed by the plurality of long rods 44 made of soft plastic material, which can improve the separation efficiency of the face paper and the gypsum. Initially, the rotating direction of the rotating rod 43 is opposite to the rotating direction of the screen 41.

[0076] In order to facilitate the removal of the face paper grabbed by the long rods 44, further, as shown in Figure 3 and Figure 4 , a cylinder 45 is connected to the outer surface of the rotating rod 43 through clamping blocks and clamping grooves, and a fixed shell 46 is arranged on the outer surface of the cylinder 45. The fixed shell 46 is fixedly connected with the cylinder 45 through a second spring 47, and the fixed shell 46 is attached to the outer surface of the cylinder 45 through the elastic force of the second spring 47. A group of long rods 44 are slidably connected inside the fixed shell 46, and one end of the long rods 44 is fixedly connected with the cylinder 45. The centrifugal force generated by the rotation of the rotating rod 43 causes the fixed shell 46 to move away from the cylinder 45 and slide along the long rods 44, so that the fluffy and bunched face paper adhered to the long rods 44 is removed.

[0077] When the gypsum and the face paper are screened, the gypsum powder particles are small, and under the action of the centrifugal force, the gypsum powder runs out of the screen holes of the screen 41 with the rotation of the screen 41, while the face paper in the screen 41 is grabbed by the long rods 44 and gradually accumulates, which can reduce the influence of the moving face paper on the screening of the gypsum. When the face paper needs to be removed, the rotating rod 43 is reversely rotated, and the centrifugal force generated by the rotation of the rotating rod 43 causes the fixed shell 46 to move away from the cylinder 45 and slide along the long rods 44, so that the moving fixed shell 46 scrapes off the fluffy and bunched face paper adhered to the long rods 44, and then the face paper is removed.

[0078] In order to improve the grabbing effect of the long rod 44 on the fluffy and bunched surface protection paper, each group of the long rod 44 contains a plurality of long rods 44, and each group of the long rod 44 is provided with an elastic block 48 on the outer surface, a plurality of through holes are formed in the elastic block 48, and a long rod 44 is arranged in each through hole, and a fixed cylinder 49 is fixedly connected to the outer surface of the elastic block 48, and one end of the fixed cylinder 49 is fixedly connected with the fixed shell 46. Each group contains a plurality of long rods 44, and the plurality of long rods 44 can improve the grabbing effect relative to one long rod 44. At the same time, due to the elastic force of the elastic block 48, the inner wall of the through hole in the elastic block 48 tightly abuts against the long rod 44, and when the fixed shell 46 moves, the elastic block 48 also slides on the outer surface of the long rod 44, so that the surface protection paper on the long rod 44 is scraped off.

[0079] When the rotating speed of the rotating rod 43 is reduced, the centrifugal force is reduced, and then the fixed shell 46 is restored to the original position under the elastic force of the second spring 47, so that the long rod 44 can grab the surface protection paper again.

[0080] The gypsum board sawing edge waste recycling device is used to provide a gypsum board sawing edge waste recycling method, which comprises the following steps:

[0081] The gypsum board sawing edge waste is crushed into blocks;

[0082] The crushed gypsum board waste is dried;

[0083] The gypsum in the dried gypsum board waste is crushed into powder, so that the gypsum falls off from the surface protection paper;

[0084] The fallen gypsum powder and the residual surface protection paper are separated by centrifugal screening.

[0085] During the crushing process of the dried gypsum board waste, the gypsum in the gypsum board waste is gradually crushed into powder, and the surface protection paper in the gypsum board waste is gradually crushed into fluffy and bunched shape.

[0086] The method provided by the application fully utilizes the characteristics of different hardness and brittleness of the gypsum and the surface protection paper in the gypsum board sawing edge waste, the gypsum board waste fragments are dried first and then crushed sufficiently, the gypsum is crushed into powder, so that the gypsum falls off from the surface protection paper, the gypsum on the gypsum board sawing edge waste can be completely separated from the surface protection paper, the residual gypsum on the surface protection paper is avoided, and the utilization rate of the gypsum and the surface protection paper in the waste is improved.

[0087] The above examples are only exemplary embodiments of the application and are not used to limit the application, and the protection scope of the application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the application within the spirit and protection scope of the application, and such modifications or equivalent replacements are also regarded as falling within the protection scope of the application.

Claims

1. A device for recycling and reusing waste material from gypsum board sawing, characterized in that, It includes a pulverizing section (10), a drying section (20), a grinding section (30), and a centrifugal sieving section (40) arranged sequentially along the conveying direction; wherein, The crushing section (10) includes two symmetrically arranged crushing rollers (11). When the two crushing rollers (11) rotate in the middle direction at the same time, they crush the waste material from the sawing of the gypsum board into blocks. The drying section (20) includes a drying box (21) and a conveyor belt (22) disposed inside the drying box (21). The conveyor belt (22) is used to transport the gypsum board waste crushed into blocks into the drying box (21) for drying. The crushing section (30) includes two symmetrically arranged crushing plates (31), which crush the dried gypsum when the two crushing plates (31) move relative to each other, thereby causing the gypsum to fall off the protective paper; The centrifugal sieving section (40) includes a rotating screen (41) and a feeding section (42) disposed between the screen (41) and the grinding plate (31). The crushed gypsum board waste is fed into the screen (41) through the feeding section (42). The centrifugal force generated by the rotating screen (41) throws the crushed gypsum out, thereby separating the gypsum from the protective paper. Among them, the waste material from the sawing of gypsum board is crushed by the crushing section (10) and dried by the drying section (20) to remove moisture. Then, it is crushed into powder by the grinding section (30) and finally separated from the protective paper by the centrifugal sieve section (40). A grinding section (50) for grinding gypsum board waste is provided between the crushing section (30) and the centrifugal screening section (40) so that the gypsum in the waste is ground into smaller particles and completely removed from the cover paper. The grinding section (50) includes a cylindrical shell (51) and a horizontally arranged rotating shaft (52) inside the shell (51). Multiple self-rotating grinding rollers (60) are installed on the outer surface of the rotating shaft (52), and the outer surface of the grinding rollers (60) is in contact with the inner wall of the shell (51) so that when the rotating shaft (52) rotates, it drives the grinding rollers (60) to rotate along the inner wall of the shell (51) and causes the grinding rollers (60) to rotate and grind the gypsum board waste inside the shell (51). Inside the screen (41), there is a rotating rod (43). The outer surface of the rotating rod (43) is connected to a number of long rods (44) made of soft plastic material. The long rods (44) can be deformed under force, so that when the rotating rod (43) rotates, it drives the long rods (44) to rotate, thereby causing the face paper that has been ground and fluffed into a ball to adhere between the multiple long rods (44). A cylinder (45) is attached to the outer surface of the rotating rod (43) by a locking block and a locking groove. A fixed shell (46) is provided on the outer surface of the cylinder (45). A second spring (47) is fixedly connected between the fixed shell (46) and the cylinder (45). The fixed shell (46) is attached to the outer surface of the cylinder (45) by the elastic force of the second spring (47). A set of long rods (44) is slidably connected inside the fixed shell (46). One end of the long rods (44) is fixedly connected to the cylinder (45). The centrifugal force generated when the rotating rod (43) rotates causes the fixed shell (46) to move away from the cylinder (45) and slide along the long rods (44), thereby removing the fluffy clumps of protective paper adhering to the long rods (44). Each set of the long rods (44) contains multiple long rods (44), and each set of the long rods (44) has an elastic block (48) on its outer surface. The elastic block (48) has multiple through holes, and each through hole has a long rod (44) inside. The outer surface of the elastic block (48) is fixedly connected to a fixing cylinder (49), and one end of the fixing cylinder (49) is fixedly connected to the fixing shell (46).

2. The gypsum board sawing waste recycling device according to claim 1, characterized in that, The two grinding plates (31) are symmetrically arranged in the left and right directions. When the two grinding plates (31) crush the dried gypsum, they continuously move in opposite directions or rotate in opposite directions with the center of the grinding plate (31) as the center. A grinding block (32) is fixedly connected to one side of the two grinding plates (31) so that when the two grinding plates (31) move relative to each other, the grinding block (32) continuously squeezes the dried gypsum board waste, thereby crushing the gypsum in it. A guide plate (33) is provided between the conveyor belt (22) and the grinding plate (31), so that the dried gypsum board waste falls between the two grinding plates (31) under the guidance of the guide plate (33).

3. The gypsum board sawing waste recycling device according to claim 1, characterized in that, An opening (54) is provided at the top of the housing (51), and an outlet (55) is provided at the bottom of the housing (51). The opening (54) is located directly below the two grinding plates (31), and a guide plate (56) is provided on both sides of the opening (54) to guide the gypsum board waste into the housing (51). A removable sealing plate (53) is provided on the outlet (55). The grinding roller (60) is provided with a mounting bracket (61), and a support plate (62) corresponding to the grinding roller (60) is fixedly connected to the outer surface of the rotating shaft (52). A telescopic rod (63) is fixedly connected between the mounting bracket (61) and the support plate (62), and a first spring (64) is provided on the outer surface of the telescopic rod (63). The two ends of the first spring (64) are fixedly connected to the support plate (62) and the mounting bracket (61) respectively. When the grinding roller (60) contacts the inner wall of the housing (51), the first spring (64) is compressed, and when the grinding roller (60) passes through the opening (54), the first spring (64) is stretched due to the rebound force, so that the grinding roller (60) moves away from the housing (51). Then the grinding roller (60) contacts the inner wall of the housing (51) again through the guiding action of the guide plate (56).

4. The gypsum board sawing waste recycling device according to claim 3, characterized in that, A connecting rod (65) is fixedly connected to one side of the support plate (62). A shovel plate (66) is fixedly connected to the end of the connecting rod (65) away from the support plate (62). The shovel plate (66) matches the inner wall of the shell (51), so that when the support plate (62) rotates, it drives the shovel plate (66) to rotate against the inner wall of the shell (51), thereby shoveling up the ground gypsum board waste and throwing the gypsum board waste down with the rotation of the shovel plate (66), so that the large-sized particles in the gypsum board waste fall on top of the small-sized particles.

5. A method for recycling and reusing waste material from gypsum board sawing, characterized in that, The gypsum board sawing waste recycling device according to any one of claims 1-4 includes the following steps: Crush the waste material from sawing the gypsum board edges into blocks; Dry the gypsum board waste that has been crushed into blocks; The gypsum in the dried gypsum board waste is crushed into powder, so that the gypsum can be removed from the facing paper; The detached plaster powder is separated from the remaining face paper by centrifugal sieving.

6. A method for recycling and reusing waste from gypsum board trimming according to claim 5, characterized in that, During the crushing process of dried gypsum board waste, the gypsum in the gypsum board waste is gradually crushed into powder, and the facing paper in the gypsum board waste is gradually crushed into fluffy clumps.

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