Pre-crushing device and method for producing fireproof flame-retardant medium-density fiberboard

Abstract

The invention relates to the technical field of smashing, and particularly discloses a pre-smashing device and method for producing fireproof flame-retardant medium-density fiberboards, the pre-smashing device comprises a smashing box, a smashing assembly is arranged in the smashing box and used for smashing materials, the pre-smashing device further comprises a top plate, the top plate is arranged at the top of the smashing box, and the top plate is arranged on the top of the smashing box. A feeding hole is formed in the middle of the top plate; and the number of the smashing rollers is two, the two ends of the two smashing rollers are rotationally installed at the two ends of the smashing box through bearings, and smashing teeth are arranged on the outer walls of the smashing rollers. The top plate is driven to move up and down by the up-and-down moving assembly, so that materials in the crushing box and the discharging cavity are not easy to form larger blocks and aggregates by utilizing vibration generated by up-and-down movement of the top plate in the crushing process, and the discharging speed of crushed fiber powder is increased; and meanwhile, the efficiency of the raw materials entering the crushing box can be improved, so that the crushing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of pulverization technology, and in particular to a pre-pulverization device and method for producing fire-resistant and flame-retardant medium-density fiberboard. Background Art

[0002] The existing technology has the following solutions to solve the blockage of crushing equipment: Publication number: CN115634743A, name: A polymer material crushing device, the prior art is provided with a crushing mechanism and an anti-adhesion and blocking mechanism, which can not only realize the crushing and screening of ultra-high purity sodium carboxymethyl cellulose at the same time, but also can clean the ultra-high purity sodium carboxymethyl cellulose adhering to the surface of the crushing roller and eject the ultra-high purity sodium carboxymethyl cellulose stuck in the sieve holes on the sieve plate, which can prevent the ultra-high purity sodium carboxymethyl cellulose from adhering to the surface of the crushing roller, affecting the use effect of the crushing roller and reducing the waste of raw materials, and can prevent the sieve holes on the surface of the sieve plate from being blocked, which can effectively ensure the screening efficiency of the sieve plate, increase the convenience of cleaning the crushing roller and the sieve plate, and improve the overall practicality of the device; In the above scheme, the surface of the crushing roller and the screen plate are mainly cleaned to achieve the effect of anti-blocking; However, in the prior art, a large part of the space inside the crushing box is in an idle state. Due to the irregular shape of the fiber powder and the friction between them, the particles are easy to adhere to each other and form large lumps or aggregates when subjected to external force or high humidity, resulting in these lumps and aggregates being concentrated in the cavity of the crushing box. In the absence of external force, these large lumps and aggregates are not easy to disperse, resulting in blocking the inside of the crushing box, resulting in poor discharge. In addition, in the prior art, the raw materials to be crushed are directly poured onto the upper part of the crushing box during feeding. The defect of this is that the raw materials at the upper part cannot be captured by the crushing roller and will always stay at the upper part (the specific reason is as mentioned above: "due to the irregular shape of the fiber powder and the friction between them, the particles are easy to adhere to each other and form larger clumps or aggregates when subjected to external forces"). Therefore, the efficiency is also reduced during feeding. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] The present invention provides a pre-crushing device and method for the production of fire-retardant medium-density fiberboard, which can solve the problem of easy clogging of fiber powder in the prior art. The specific scheme is as follows: In one aspect, the present invention provides a pre-crushing device for producing fire-retardant medium-density fiberboard, comprising a crushing box, wherein a crushing assembly is arranged inside the crushing box, and the crushing assembly is used to crush the material, and further comprising: A top plate, the top plate is arranged on the top of the crushing box, and a feed port is arranged in the middle of the top plate; There are two crushing rollers, both ends of which are rotatably mounted on both ends of the crushing box through bearings, and the outer walls of the crushing rollers are provided with crushing teeth; The feeding cavity is circular in shape and is opened in the middle of the top plate. The top of the feeding cavity is connected with the feeding port, and the raw materials can enter the feeding cavity after being poured from the feeding port; A material discharge assembly is installed inside the material discharge cavity, and the material discharge assembly is used to prevent the raw materials from being blocked inside the material discharge cavity; An up-and-down motion assembly, used to drive the top plate to move up and down relative to the crushing box; By using the up and down motion components to drive the top plate to move up and down, during the crushing process, the vibration generated by the up and down motion of the top plate is utilized, so that the materials in the crushing box and the feeding chamber are not easy to form large lumps and aggregates, thereby increasing the feeding speed of the crushed fiber powder, and at the same time can improve the efficiency of the raw materials entering the crushing box, thereby improving the crushing efficiency.

[0005] Preferably, a fixing plate is provided at the bottom of the crushing box, and through holes are provided on both sides of the fixing plate and both ends of the bottom of the crushing box. Bolts are provided inside the through holes to fix the crushing box and the fixing plate together, and a support frame is fixedly installed at the bottom of the fixing plate.

[0006] Preferably, the inner wall of the crushing box is provided with comb teeth matching the gaps between the crushing teeth, and the crushing teeth can be inserted into the gaps between the comb teeth to prevent the material from falling from the inner wall edge of the crushing box to the bottom of the crushing box.

[0007] Preferably, it also includes: There are two first gears, the two first gears are respectively fixedly connected to the same end of the two crushing rollers, and the two first gears are meshed with each other; The first motor is fixedly mounted on the outer wall of the crushing box, and the output shaft of the first motor is fixedly connected to one end of one of the crushing rollers. The first motor can drive one of the crushing rollers to rotate, and then utilize the meshing action of the two first gears to make the two crushing rollers rotate synchronously.

[0008] Also includes: A material discharge box, the material discharge box is fixedly connected to the bottom of the crushing box, the interior of the material discharge box is connected to the interior of the crushing box, and the raw materials in the crushing box can fall into the material discharge box; A discharge hopper is fixedly connected to the bottom of the lower material box, the interior of the discharge hopper is communicated with the interior of the lower material box, and the discharge hopper is inclined. After the material inside the crushing box falls into the lower material box, it flows out along the discharge hopper.

[0009] Preferably, the blanking assembly comprises: A main shaft, two ends of which are rotatably connected to two ends of the feeding cavity; There are a plurality of baffles, and the number is odd, which are fixedly connected to the outer wall of the main shaft, and a material discharge trough is formed between two adjacent baffles and the inner wall of the material discharge cavity, and a material discharge port is opened at the bottom of the material discharge cavity, and the bottom of the material discharge port is connected to the inside of the crushing box; Among them, when the feed chute rotates to the position of the feed port, the material in the feed chute can fall into the crushing box, and the baffle blocks the feed port at this time; when the feed chute rotates to the position of the feed port, the material at the feed port can fall into the feed cavity, and the baffle blocks the feed port at this time.

[0010] Preferably, it also includes: A first sprocket, fixedly connected to one end of the main shaft; A rotating rod having two; A rotating frame is fixedly connected to the two ends of the top of the crushing box, and the two ends of the two rotating rods are rotatably connected to the rotating frame; There are four cams, which are fixedly connected to the two ends of the two rotating rods respectively. When the two rotating rods rotate synchronously, the convex part of the cam faces upward, which can lift the top plate. When the cam leaves the top point, the top plate automatically descends under the action of gravity. The number of the convex parts of the cam is the same as that of the baffle. There are two second sprockets, which are respectively fixedly connected to one end of the two rotating rods, and the two second sprockets are respectively arranged at two ends of the first sprocket; A chain drivingly connected to the first sprocket and two of the second sprockets; a second motor, whose output shaft is connected to one end of the first sprocket; A connecting frame is fixedly connected to one end of the top plate, and the second motor is connected to the connecting frame.

[0011] Preferably, it also includes: A linkage rod is fixedly connected to both ends of the top plate, one end of the linkage rod away from the top plate is connected to a slider, both ends of the fixed plate are connected to sliding sleeves, and the slider is slidably connected to the sliding sleeves; A cross bar is fixedly connected to the bottom end of the slider, and long slots are provided at both ends of the material box. Both ends of the cross bar penetrate the long slots at both ends of the material box, and both ends of the cross bar are slidably connected to the long slots. A blocking piece, the blocking piece is fixedly connected to both ends of the cross bar, and the blocking piece can block the outside of the long slot; A dredging rod is fixedly connected to the outer wall of the cross bar. There are a plurality of dredging rods, and the plurality of dredging rods are all arranged inside the discharge box.

[0012] Preferably, it also includes: There are four limit rods, and the four limit rods are respectively fixedly connected to the four corners of the top of the crushing box; There are four limiting holes, the four limiting holes are respectively opened at the four corners of the top of the top plate, the limiting holes correspond to the positions of the limiting rods, and the limiting rods are slidably connected to the limiting holes; A spring is sleeved on the outer wall of the limiting rod, and the upper and lower ends of the spring are respectively fixedly connected to the bottom of the top plate and the top of the crushing box.

[0013] In another aspect, the present invention provides a pre-crushing method for producing fire-retardant medium density fiberboard, comprising the following steps: S1. Pour the raw materials to be pre-crushed from the feed inlet into the feed cavity inside the top plate; S2, the material discharging assembly rotates in the material discharging chamber so that the raw materials will not accumulate in the material discharging chamber; S3, the top plate is driven to move up and down by the up and down moving components, so that the whole equipment vibrates, so that the raw materials will not accumulate inside the feeding cavity and the crushing box; S4, driving the two crushing rollers to rotate synchronously through a driving source; S5, the crushing teeth on the two crushing rollers crush the raw materials to achieve the crushing purpose; S6. The crushed fiber powder is discharged from the bottom of the crushing box.

[0014] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: 1. By using the up and down motion components to drive the top plate to move up and down, the vibration generated by the up and down motion of the top plate is used during the crushing process, so that the materials in the crushing box and the feeding cavity are not easy to form large lumps and aggregates, thereby increasing the feeding speed of the crushed fiber powder, and at the same time can improve the efficiency of the raw materials entering the crushing box, thereby improving the efficiency of crushing.

[0015] 2. By arranging a feeding assembly inside the feeding chamber, when the raw materials enter the feeding chamber, the feeding assembly can be rotated to allow the raw materials to enter the inside of the crushing box in turn to avoid accumulation inside the feeding chamber. Due to the rotation of the feeding assembly, the raw materials on the top will be directly transferred to the bottom of the feeding chamber, and then the inertia and vibration of the upper and lower movements of the top plate will be used to allow the raw materials to enter the crushing box from the feeding port at the bottom of the feeding chamber.

[0016] 3. Through the up and down movement of the top plate, when the top plate is in the lowered position, the bottom of the top plate can squeeze the raw materials inside the crushing box, making the raw materials easier to be captured by the two crushing rollers, thereby further improving the crushing efficiency.

[0017] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them: Figure 1 It is a first-view stereoscopic diagram of the present invention as a whole; Figure 2 It is a second perspective stereogram of the present invention as a whole; Figure 3 It is a third-view stereogram of the present invention as a whole; Figure 4 A perspective view of a crushing box and a crushing roller of the present invention; Figure 5 It is an exploded schematic diagram of the crushing box and crushing roller of the present invention; Figure 6 It is an overall side sectional view of the present invention; Figure 7 It is a side cutaway perspective view of the present invention as a whole; Figure 8 It is an overall exploded view of the present invention; Fig. 9 A three-dimensional diagram of a pulverizing roller of the present invention; Fig.10 A three-dimensional diagram of the blanking assembly of the present invention; Fig.11 A first-view stereoscopic view of the top plate and the dredging rod of the present invention; Fig.12A second perspective stereoscopic view of the top plate and the dredging rod of the present invention; Fig.13 A three-dimensional diagram of the top plate, crushing roller and dredging rod of the present invention; Fig.14 It is a schematic diagram of the internal structure of the crushing box of the present invention.

[0019] The reference numerals are as follows: 101, crushing box; 102, fixing plate; 103, supporting frame; 104, top plate; 105, feeding port; 106, crushing roller; 107, comb teeth; 108, first gear; 109, first motor; 110, unloading box; 111, discharging hopper; 201, unloading cavity; 202, blanking assembly; 2021, main shaft; 2022, baffle; 2023, blanking chute; 2024, first sprocket; 203, rotating rod; 204, rotating frame; 205, cam; 206, second sprocket; 207, connecting frame; 208, second motor; 209, chain; 210, avoidance groove; 211, connecting rod; 212, sliding block; 213, cross bar; 214, clearing rod; 215, blocking piece; 216, long notch; 217, sliding sleeve; 218, limiting rod; 219, limiting hole; 220, spring; 221, supporting platform. DETAILED DESCRIPTION

[0020] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present invention and are used to explain the principles of the present invention together with the embodiments of the present invention.

[0021] Embodiment 1: Figure 1 , Figure 2 , Figure 3 The present embodiment provides a pre-crushing device for the production of fire-retardant medium-density fiberboard, which can pre-crush raw materials for producing fire-retardant medium-density fiberboard. The raw materials for producing the fiberboard include wood fibers or other fiber materials, specifically including: A crushing box 101, the crushing box 101 is used to crush raw materials, a fixing plate 102 is provided at the bottom of the crushing box 101, through holes are provided on both sides of the fixing plate 102 and both ends of the bottom of the crushing box 101, bolts are provided inside the through holes, and the crushing box 101 and the fixing plate 102 are fixed together by the bolts. In some usage scenarios, in order to facilitate the placement of raw materials into the crushing box 101, the height of the crushing box 101 can be increased. The specific method is to provide a support frame 103 at the bottom of the fixing plate 102, and the support frame 103 is formed by a plurality of square steel pipes welded together. The bottom of the fixing plate 102 and the top of the support frame 103 are fixed by bolts or welding to ensure that the crushing box 101 is stably placed in a designated area; A top plate 104 is disposed on the top of the crushing box 101. A trumpet-shaped feed port 105 is disposed in the middle of the top plate 104. Raw materials for producing fiberboard can be put into the crushing box 101 through the feed port 105, so that the crushing assembly inside the crushing box 101 can crush the raw materials.

[0022] like Figure 4 , Figure 5 The crushing box 101 has a crushing assembly inside, and the crushing assembly includes: There are two crushing rollers 106, and the two ends of the two crushing rollers 106 are rotatably mounted on the two ends of the crushing box 101 through bearings. The outer wall of the crushing roller 106 is provided with crushing teeth. According to different shapes and uses, the crushing teeth can be divided into various types, such as coarse and fine tooth rollers, wolf teeth, special teeth for coke cutting, ring teeth, straight teeth, large plate teeth, long teeth, square wave teeth, sharp wave teeth, oblique square teeth and large wolf teeth (thickened, enlarged, wear-resistant), etc., and the crushing teeth on the outer walls of the two crushing rollers 106 are staggered with each other, and the inner wall of the crushing box 101 is provided with comb teeth 107 matching the gap between the crushing teeth, and the crushing teeth can be inserted into the gap between the comb teeth 107 to prevent the material from falling from the inner wall edge of the crushing box 101 to the bottom of the crushing box 101, resulting in part of the raw materials not being crushed in place; There are two first gears 108, the two first gears 108 are respectively fixedly connected to the same end of the two crushing rollers 106, and the two first gears 108 are meshed with each other; A first motor 109 is fixedly mounted on the outer wall of the crushing box 101, and an output shaft of the first motor 109 is fixedly connected to one end of one of the crushing rollers 106. The first motor 109 can drive one of the crushing rollers 106 to rotate, and then the two crushing rollers 106 are rotated synchronously by the meshing action of the two first gears 108; A material discharge box 110, wherein the material discharge box 110 is fixedly connected to the bottom of the crushing box 101, and the interior of the material discharge box 110 is communicated with the interior of the crushing box 101, and the raw materials in the crushing box 101 can fall into the material discharge box 110; The discharge hopper 111 is fixedly connected to the bottom of the lower material box 110 , and the interior of the discharge hopper 111 is connected to the interior of the lower material box 110 . The discharge hopper 111 is tilted, and the material inside the crushing box 101 falls into the lower material box 110 and flows out along the discharge hopper 111 .

[0023] like Figure 6 , Figure 7 , Figure 8 As shown, as a possible embodiment, it also includes: The material lowering chamber 201 is circular in shape and is opened in the middle of the top plate 104. The top of the material lowering chamber 201 is connected to the feed port 105. The raw materials can enter the material lowering chamber 201 after being poured from the feed port 105. A material discharge assembly 202, installed inside the material discharge chamber 201, and used to prevent the raw materials from being blocked inside the material discharge chamber 201; like Fig. 9 , Fig.10 As shown, the blanking assembly 202 includes: A main shaft 2021, two ends of which are rotatably connected to two ends of the feeding chamber 201; There are a plurality of baffles 2022, which are in odd number and fixedly connected to the outer wall of the main shaft 2021. A material discharge trough 2023 is formed between two adjacent baffles 2022 and the inner wall of the material discharge chamber 201. A material discharge opening is provided at the bottom of the material discharge chamber 201, and the bottom of the material discharge opening is communicated with the interior of the crushing box 101. In the above scheme, when the material chute 2023 rotates to the position of the material discharge port, the material in the material chute 2023 can fall into the crushing box 101, and the baffle 2022 blocks the feed port 105; when the material chute 2023 rotates to the position of the feed port 105, the material in the feed port 105 can fall into the material discharge cavity 201, and the baffle 2022 blocks the material discharge port; The blanking assembly 202 further includes: A first sprocket 2024, fixedly connected to one end of the main shaft 2021; It also includes: a rotating rod 203, having two; The rotating frame 204 is fixedly connected to the two ends of the top of the crushing box 101, and the two ends of the two rotating rods 203 are rotatably connected to the rotating frame 204; There are four cams 205, which are respectively fixedly connected to the two ends of the two rotating rods 203. When the two rotating rods 203 rotate synchronously, the convex part of the cam 205 faces upward, which can lift the top plate 104. When the cam 205 leaves the top point, the top plate 104 automatically descends under the action of gravity. The number of the convex parts of the cam 205 is the same as that of the baffle 2022. There are two second sprockets 206, which are respectively fixedly connected to one end of the two rotating rods 203, and the two second sprockets 206 are respectively arranged at two ends of the first sprocket 2024; The chain 209 is in driving connection with the first sprocket 2024 and the two second sprockets 206, so that when one of the first sprockets 2024 or the second sprockets 206 rotates, the other first sprockets 2024 and the second sprockets 206 can rotate synchronously; A second motor 208, whose output shaft is connected to one end of the first sprocket 2024; A connecting frame 207 is fixedly connected to one end of the top plate 104, and the second motor 208 is connected to the connecting frame 207 to achieve a fixing function; Due to the irregular shape of the fiber powder and the friction between them, the particles are easy to adhere to each other and form larger lumps or aggregates when subjected to external forces. The size of these lumps is larger than the gap between the two crushing rollers 106, thereby preventing the fiber powder from leaking out of the gap between the two crushing rollers 106, causing the fiber powder to accumulate inside the crushing box 101. Therefore, in the above scheme, the second motor 208 drives the first sprocket 2024 to rotate, thereby rotating the main shaft 2021 and the baffle 2022, thereby achieving the effect of unloading, and due to the transmission effect of the chain 209, the two second sprockets 206 and the two rotating rods 203 also rotate synchronously, thereby rotating the convex part of the cam 205, driving the top plate 104 to rise and fall. When the top plate 104 rises and falls, a certain vibration amplitude can be generated, so that the raw materials in the crushing box 101 and the unloading chamber 201 can be shaken off, and are not easily blocked in the crushing box 101 and the unloading chamber 201, so that the fluidity of the fiber powder is effectively improved during the entire crushing process, thereby improving the efficiency of the entire crushing process; like Figure 8As shown, when the top plate 104 moves up and down driven by the cam 205, in order not to affect the up and down movement of the rotating rod 203, avoidance grooves 210 are opened on both sides of the top plate 104. The cross-sectional shape of the avoidance groove 210 is a long groove shape. Therefore, when the top plate 104 moves up and down, the rotating rod 203 can slide up and down in the avoidance groove 210 without causing motion interference. Moreover, since the first sprocket 2024 and the main shaft 2021 move up and down synchronously with the top plate 104, through the flexible characteristics of the chain 209, when the first sprocket 2024 moves up and down, the first sprocket 2024 can also engage with the chain 209 normally.

[0024] like Fig.11 , Fig.12 As shown, the pre-crushing device for producing fire-retardant medium density fiberboard disclosed in this embodiment also includes: A linkage rod 211 is fixedly connected to both ends of the top plate 104. One end of the linkage rod 211 away from the top plate 104 is connected to a slider 212. Both ends of the fixed plate 102 are connected to a sliding sleeve 217. The slider 212 is slidably connected to the sliding sleeve 217. A cross bar 213 is fixedly connected to the bottom end of the slider 212. Long slots 216 are provided at both ends of the material box 110. Both ends of the cross bar 213 penetrate the long slots 216 at both ends of the material box 110. Both ends of the cross bar 213 are slidably connected to the long slots 216. A blocking piece 215, wherein the blocking piece 215 is fixedly connected to both ends of the cross bar 213, and the blocking piece 215 can block the outside of the long slot 216; A dredging rod 214 is fixedly connected to the outer wall of the cross bar 213. There are a plurality of dredging rods 214, and the plurality of dredging rods 214 are all arranged inside the unloading box 110; In the above scheme, since the top plate 104 can move up and down, the linkage rods 211 at both ends of the top plate 104 can move up and down synchronously. When the linkage rods 211 move up and down, the dredging rods 214 can be driven to move up and down synchronously, thereby dredging the fiber powder at the bottom of the crushing box 101, preventing the fiber powder from being blocked at the bottom of the crushing box 101, resulting in slow discharge or even no discharge. like Fig.13 , Fig.14 As shown, the pre-crushing device for producing fire-retardant medium density fiberboard disclosed in this embodiment also includes: There are four limiting rods 218, and the four limiting rods 218 are respectively fixedly connected to the four corners of the top of the crushing box 101; The limiting holes 219 have four, four limiting holes 219 are respectively opened at the four corners of the top of the top plate 104, the limiting holes 219 correspond to the positions of the limiting rods 218, and the limiting rods 218 are slidably connected to the limiting holes 219; A spring 220 is sleeved on the outer wall of the limiting rod 218, and the upper and lower ends of the spring 220 are fixedly connected to the bottom of the top plate 104 and the top of the crushing box 101 respectively; The support platform 221 is fixedly connected to the top of the crushing box 101 . The height of the support platform 221 is the minimum distance between the top plate 104 and the crushing box 101 .

[0025] Embodiment 2: The technical solution of this embodiment is different from that of Embodiment 1 in that this embodiment provides a pre-crushing method for producing fire-retardant medium density fiberboard, comprising the following steps: S1, pour the raw materials to be pre-crushed from the feed inlet 105 into the feed cavity 201 inside the top plate 104; S2, the material discharging assembly 202 rotates in the material discharging chamber 201, so that the raw materials will not be accumulated in the material discharging chamber 201; S3, driving the top plate 104 to move up and down through the up and down moving assembly, so that the whole device vibrates, so that the raw materials will not accumulate inside the feeding chamber 201 and the crushing box 101; S4, driving the two crushing rollers 106 to rotate synchronously through a driving source; S5, the crushing teeth on the two crushing rollers 106 crush the raw materials to achieve the crushing purpose; S6. The crushed fiber powder is discharged from the bottom of the crushing box 101.

[0026] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0027] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0028] In the embodiments of the present application, the devices or elements referred to or implied must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise precisely and specifically specified.

[0029] The parallelism defined in this application is not limited to absolute parallelism. This definition of parallelism can be understood as basic parallelism, which allows for non-absolute parallelism due to factors such as assembly tolerance, design tolerance, and influence of structural flatness. Small angle errors are allowed. For example, an assembly error range of less than 10 degrees can be understood as a parallel relationship.

[0030] Vertical: The verticality defined in this application is not limited to an absolute vertical intersection relationship (angle of 90 degrees). It allows for non-absolute vertical intersection relationships caused by factors such as assembly tolerance, design tolerance, and influence of structural flatness. It also allows for errors in a small angle range. For example, the assembly error range of 80 to 100 degrees can be understood as a vertical relationship.

[0031] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A pre-crushing device for producing fire-retardant medium-density fiberboard, comprising a crushing box (101), wherein a crushing assembly is arranged inside the crushing box (101), and the crushing assembly is used to crush materials, characterized in that: Also includes: A top plate (104), the top plate (104) being arranged on the top of the crushing box (101), and a feed opening (105) being arranged in the middle of the top plate (104); There are two crushing rollers (106), the two ends of the two crushing rollers (106) are rotatably mounted on the two ends of the crushing box (101) through bearings, and the outer walls of the crushing rollers (106) are provided with crushing teeth; The material discharge chamber (201) is circular in shape and is opened in the middle of the top plate (104); the top of the material discharge chamber (201) is connected to the feed port (105); and the raw materials can enter the material discharge chamber (201) after being poured from the feed port (105); A material discharge assembly (202) is installed inside the material discharge chamber (201), and the material discharge assembly (202) is used to prevent raw materials from being blocked inside the material discharge chamber (201); The up-and-down motion component is used to drive the top plate (104) to move up and down relative to the crushing box (101).

2. A pre-crushing device for producing fire-retardant medium density fiberboard according to claim 1, characterized in that: A fixing plate (102) is provided at the bottom of the crushing box (101), through holes are provided on both sides of the fixing plate (102) and at both ends of the bottom of the crushing box (101), bolts are provided inside the through holes, and the crushing box (101) and the fixing plate (102) are fixed together by the bolts, and a support frame (103) is fixedly mounted on the bottom of the fixing plate (102).

3. A pre-crushing device for producing fire-retardant medium density fiberboard according to claim 1, characterized in that: The inner wall of the pulverizing box (101) is provided with comb teeth matching the gaps between the pulverizing teeth, and the pulverizing teeth can be inserted into the gaps between the comb teeth to prevent materials from falling from the inner wall edge of the pulverizing box (101) to below the pulverizing box (101).

4. A pre-crushing device for producing fire-retardant medium density fiberboard according to claim 1, characterized in that: Also includes: There are two first gears (108), the two first gears (108) are respectively fixedly connected to the same end of the two crushing rollers (106), and the two first gears (108) are meshed with each other; The first motor (109) is fixedly mounted on the outer wall of the pulverizing box (101), and the output shaft of the first motor (109) is fixedly connected to one end of one of the pulverizing rollers (106). The first motor (109) can drive one of the pulverizing rollers (106) to rotate, and then utilize the meshing action of the two first gears (108) to make the two pulverizing rollers (106) rotate synchronously.

5. A pre-crushing device for producing fire-retardant medium density fiberboard according to claim 2, characterized in that: Also includes: A material discharge box (110), the material discharge box (110) being fixedly connected to the bottom of the crushing box (101), the interior of the material discharge box (110) being in communication with the interior of the crushing box (101), and the raw materials in the crushing box (101) being able to fall into the material discharge box (110); A discharge hopper (111), the discharge hopper (111) being fixedly connected to the bottom of the discharge box (110), the interior of the discharge hopper (111) being in communication with the interior of the discharge box (110), the discharge hopper (111) being arranged at an angle, and the material in the crushing box (101) falling into the discharge box (110) flows out along the discharge hopper (111).

6. A pre-crushing device for producing fire-retardant medium density fiberboard according to claim 1, characterized in that: The blanking assembly (202) comprises: A main shaft (2021), wherein two ends of the main shaft (2021) are rotatably connected to two ends of the material discharge chamber (201); There are a plurality of baffles (2022), the number of which is odd and fixedly connected to the outer wall of the main shaft (2021); a material discharge trough (2023) is formed between two adjacent baffles (2022) and the inner wall of the material discharge chamber (201); a material discharge opening is provided at the bottom of the material discharge chamber (201); and the bottom of the material discharge opening is communicated with the interior of the crushing box (101); When the feed chute (2023) is rotated to the position of the feed opening, the material in the feed chute (2023) can fall into the crushing box (101), and the baffle (2022) blocks the feed opening (105); when the feed chute (2023) is rotated to the position of the feed opening (105), the material in the feed opening (105) can fall into the feed cavity (201), and the baffle (2022) blocks the feed opening.

7. A pre-crushing device for producing fire-retardant medium density fiberboard according to claim 6, characterized in that: Also includes: A first sprocket (2024) fixedly connected to one end of the main shaft (2021); There are two rotating rods (203); A rotating frame (204) is fixedly connected to the two ends of the top of the crushing box (101), and the two ends of the two rotating rods (203) are rotatably connected to the rotating frame (204); There are four cams (205) which are respectively fixedly connected to the two ends of the two rotating rods (203). When the two rotating rods (203) rotate synchronously, the convex parts of the cams (205) face upwards, so that the top plate (104) can be lifted up. When the cams (205) leave the top point, the top plate (104) automatically descends under the action of gravity. The number of the convex parts of the cams (205) is the same as that of the baffle (2022); The second sprocket (206) has two sprockets, which are respectively fixedly connected to one end of the two rotating rods (203), and the two second sprockets (206) are respectively arranged at two ends of the first sprocket (2024); A chain (209) drivingly connected to the first sprocket (2024) and the two second sprockets (206); A second motor (208), whose output shaft is connected to one end of the first sprocket (2024); A connecting frame (207) is fixedly connected to one end of the top plate (104), and the second motor (208) is connected to the connecting frame (207).

8. A pre-crushing device for producing fire-retardant medium density fiberboard according to claim 5, characterized in that: Also includes: A connecting rod (211) is fixedly connected to both ends of the top plate (104); one end of the connecting rod (211) away from the top plate (104) is connected to a sliding block (212); both ends of the fixed plate (102) are connected to sliding sleeves (217); and the sliding block (212) is slidably connected to the sliding sleeves (217); A cross bar (213) is fixedly connected to the bottom end of the slider (212); long slots (216) are provided at both ends of the material discharge box (110); both ends of the cross bar (213) penetrate the long slots (216) at both ends of the material discharge box (110); and both ends of the cross bar (213) are slidably connected to the long slots (216); A blocking piece (215), the blocking piece (215) being fixedly connected to both ends of the cross bar (213), and the blocking piece (215) being capable of blocking the outside of the long slot (216); A dredging rod (214) is fixedly connected to the outer wall of the cross bar (213), and there are a plurality of dredging rods (214), which are all arranged inside the discharge box (110).

9. A pre-crushing device for producing fire-retardant medium density fiberboard according to claim 8, characterized in that: Also includes: There are four limiting rods (218), and the four limiting rods (218) are respectively fixedly connected to the four corners of the top of the crushing box (101); There are four limiting holes (219), the four limiting holes (219) are respectively opened at four corners of the top of the top plate (104), the limiting holes (219) correspond to the positions of the limiting rods (218), and the limiting rods (218) are slidably connected to the limiting holes (219); A spring (220) is sleeved on the outer wall of the limiting rod (218), and the upper and lower ends of the spring (220) are fixedly connected to the bottom of the top plate (104) and the top of the crushing box (101) respectively.

10. A pre-crushing method for producing fire-resistant and flame-retardant medium density fiberboard, using a pre-crushing device for producing fire-resistant and flame-retardant medium density fiberboard according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Pour the raw materials to be pre-crushed from the feed inlet (105) into the feed cavity (201) inside the top plate (104); S2, rotating the material discharging assembly (202) in the material discharging chamber (201) so that the raw materials will not accumulate in the material discharging chamber (201); S3, driving the top plate (104) to move up and down through the up and down moving assembly, so that the entire device vibrates, so that the raw materials will not accumulate inside the feeding chamber (201) and the crushing box (101); S4, driving the two crushing rollers (106) to rotate synchronously via a driving source; S5, the crushing teeth on the two crushing rollers (106) crush the raw materials, thereby achieving the crushing purpose; S6. The crushed fiber powder is discharged from the bottom of the crushing box (101).

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