Preparation Device and Preparation Method of YDB Sound Absorbing and Heat Insulating Material

Abstract

The present invention discloses a preparation device and a preparation method for a YDB sound-absorbing and heat-insulating material, specifically relating to the technical field of functional material manufacturing. The preparation method includes melt extrusion; filtration; metering; fiber formation; stretching; cooling. The present invention includes a screw extrusion assembly, and the screw extrusion assembly includes a support frame. A top of the support frame is fixedly connected with an extrusion barrel. A top of the extrusion barrel is communicated with a feeding assembly. A plurality of heating assemblies are arranged on an outer edge surface of the extrusion barrel. A rotating barrel is arranged inside the extrusion barrel. A plurality of control plates are evenly distributed inside the rotating barrel. A stirring plate is hinged inside the control plate. The present invention can enable each part of the material in the extrusion barrel to be evenly heated, can effectively reduce the caking phenomenon of the material, and ensure the processing quality of the material.

Description

Technical Field

[0001] The present invention relates to the technical field of functional material manufacturing, and more specifically, to a preparation device and a preparation method for a YDB sound-absorbing and heat-insulating material. Background Art

[0002] The YDB sound-absorbing and heat-insulating material is mostly composed of polyester fibers and polypropylene microfibers, and the surface is covered with spunbonded cloth or aluminum foil. During manufacturing, generally, the finished products of polyester fibers and polypropylene microfibers are blown, and then the surface is covered with spunbonded cloth or aluminum foil. It has good sound absorption effect and can absorb sounds of different frequencies. It has excellent heat insulation performance and can effectively reduce heat transfer. It is mainly used in high-end automobiles to enhance the sound absorption and heat insulation effect. During the preparation process of the YDB sound-absorbing and heat-insulating material, melt blowing, filling and sewing processes are required. Among them, in the melt blowing process, a screw extrusion assembly is needed to send the raw material PP particles into the screw extruder, heat and melt them, and extrude and filter them into a melt.

[0003] For example, a Chinese patent document with the application number 202311098814.9 discloses a single-screw extrusion assembly, which relates to the technical field of screw extrusion assemblies. It includes a support, on which a power unit and an extrusion barrel are fixedly connected. An extrusion die head is installed on the extrusion barrel, and a rotating shaft is installed on the power unit. The rotating shaft is located inside the extrusion barrel. The rotating shaft is fixedly connected with a first spiral blade, and the rotating shaft is fixedly connected with a first straight gear. The support is rotatably provided with a second straight gear meshing with the first straight gear through a connecting rod. The extrusion barrel is rotatably provided with a first rotating frame, and the first rotating frame is fixedly connected with a rotating disk. The rotating disk is provided with an internal gear ring meshing with the second straight gear. The first rotating frame is fixedly connected with a second spiral blade. The support is provided with a heating mechanism, and the extrusion die head is provided with a cooling mechanism. Through the staggered rotation of the second spiral blade and the first spiral blade, the material is fully crushed, and then combined with the heating mechanism to ensure that the material in the extrusion barrel is evenly heated and plasticized. Through the cooling mechanism, the temperature of the extruded material is kept uniform to ensure the quality of the extruded product.

[0004] This invention can uniformly heat and plasticize the material in the extrusion barrel through the reciprocating rotation of the electric heating sleeve and the heating plate in the heating mechanism, thereby ensuring the quality of the subsequent extruded products. However, the material falling into the extrusion barrel will naturally stratify in the extrusion barrel under the action of gravity. The material close to the outer ring of the extrusion barrel can fully absorb heat and be fully melted. However, as the distance from the side wall of the extrusion barrel increases, the heat absorbed by the material gradually decreases, causing the material in the inner and outer rings of the extrusion barrel to be heated obviously unevenly, which will undoubtedly have a negative impact on the extrusion quality. In the meltblowing process, multiple heating areas need to be divided. When the material is heated unevenly in the extrusion barrel, the screw extrusion assembly continues to push the material forward, and the unevenly heated material is prone to agglomeration. The agglomerated materials continue to move under the continuous propulsion of the screw extruder assembly, but the equipment cannot identify these agglomerated materials and extend their heating time accordingly. This will cause some materials to not be fully heated, and then cause the problem of insufficient plasticization. When these unevenly plasticized materials are extruded, the surface of the finished product will lose its due smoothness, defects will appear frequently, and it will not meet the qualified standards, which will seriously affect the overall quality of the product. Summary of the Invention

[0005] In order to overcome the above-mentioned defects of the prior art, the present invention provides a device and method for preparing a YDB sound-absorbing and heat-insulating material to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A device for preparing YDB sound-absorbing and heat-insulating materials, comprising a screw extrusion assembly, the screw extrusion assembly comprising a support frame, an extrusion barrel fixedly connected to the top of the support frame, a feeding assembly connected to the top of the extrusion barrel, a plurality of heating assemblies evenly distributed along its length are provided on the outer edge surface of the extrusion barrel, a rotatable rotating barrel is provided in the extrusion barrel, an auger is provided on the outer edge surface of the rotating barrel, a plurality of control plates are evenly distributed along its length in the rotating barrel, the control plate can extend out of the outer wall of the rotating barrel, a stirring plate for stirring the material is hinged in the control plate, and when the stirring plate encounters agglomerated material during stirring, the stirring plate adjacent to it can be controlled to slow down stirring, thereby sealing the extrusion barrel and extending the heating time of the material agglomeration interval.

[0007] Preferably, a reducer is provided on the support frame, and a motor is provided on the support frame. The output end of the motor is connected to the reducer, and the output end of the extruder is connected to the reducer via a transmission shaft. The reducer can control the rotation of the drum.

[0008] Preferably, a fixed shaft is coaxially fixedly connected inside the extrusion barrel, a first cam is fixedly connected to the side of the fixed shaft close to the feeding assembly, and a plurality of second cams are rotatably connected to the side of the fixed shaft away from the feeding assembly, a circular groove is provided on the second cam, and the circular groove is connected to the fixed shaft via a torsion spring.

[0009] Preferably, a plurality of through slots corresponding to the control plates are provided on the side wall of the rotating drum, and the control plates are slidably connected to the through slots on the corresponding sides. The end of the control plate close to the center of the rotating drum is connected to a contact plate via a plurality of first springs, and the end of the contact plate close to the center of the rotating drum contacts the first cam or the second cam on the corresponding side. A baffle is fixedly connected to the side wall of the control plate, and the top of the baffle is connected to the inner wall of the rotating drum via a plurality of second springs.

[0010] Preferably, a clearance groove is provided at one end of the control plate close to the feed assembly, and the stirring plate is rotatably connected to the control plate through a rotating shaft, and the end of the rotating shaft close to the feed assembly extends into the clearance groove, and two rotating rods are fixedly connected to one end of the rotating shaft located in the clearance groove, and a guide column is provided at one end of the rotating rod close to the feed assembly.

[0011] Preferably, a push rod is provided at one end of the contact plate close to the feeding assembly, and the end of the push rod close to the side wall of the rotating drum extends into the give way groove. A transverse groove located in the give way groove is opened on the push rod, and a wedge block is slidably connected in the transverse groove. The end of the wedge block close to the rotating shaft is an inclined surface, and the wedge block can contact with the guide column. The end of the wedge block close to the feeding assembly is connected to the side wall of the give way groove via a third spring, and two guide plates are provided on the side of the wedge block close to the rotating shaft.

[0012] Preferably, a slide groove is provided at one end of the control plate away from the feeding component, a slide plate is slidably connected in the slide groove, the end of the slide plate away from the feeding component contacts the side wall of the slide groove via a fourth spring, the end of the slide plate close to the feeding component contacts the stirring plate, and the end of the slide plate away from the feeding component is fixedly connected to a feedback plate.

[0013] Preferably, the end of the feedback plate away from the feed assembly passes through the control plate, and a plurality of brake plates corresponding to the control plate are slidably connected in the rotating drum. A vertical groove with an opening toward the feed assembly is provided on the brake plate, and the feedback plate is slidably connected to the vertical groove. The side of the brake plate away from the feed assembly can contact the second cam adjacent to it.

[0014] Preferably, the two longer end surfaces of the stirring plate are inclined surfaces, and the thickness of the end of the stirring plate close to the feeding assembly is smaller than the thickness of the end of the stirring plate away from the feeding assembly.

[0015] A method for preparing a YDB sound-absorbing and heat-insulating material comprises the following steps:

[0016] S1. Melt Extrusion: Using a screw extrusion assembly, set the motor power to 18.6 kW, the motor speed to 1470 r / min, the melt index to 1500, and heat in five zones. The heating temperatures of the five zones are as follows: Zone 1: 180 °C, Zone 2: 200 °C, Zone 3: 220 °C, Zone 4: 240 °C, and Zone 5: 250 °C.

[0017] S2. Filtration: Use a hydraulic screen changer filter for filtration to ensure that the purity of the melt reaches 99.8% to ensure the smooth progress of spinning. The filter screen uses a 300-mesh high-mesh screen, and the pressure of the filtered melt is maintained at about 3 kg. The heating temperature of the filter is 250 °C.

[0018] S3. Metering: Use a metering pump with a model of 60 cc. By adjusting the melt flow rate, the product gram weight can be controlled. The heating temperature of the metering pump is 230 °C.

[0019] S4. Fiber Formation: Use an extrusion die head with eight heating zones on it. Since the fluidity of the melt is related to temperature, the flow rate of the melt in each zone is adjusted by controlling the temperature of each zone. The temperatures on both sides of the extrusion die head are relatively high, about 250 °C, while the temperature in the middle part is relatively low, about 200 °C, so that the plastic melt from the screw extrusion assembly is well distributed in the flow channel of the extrusion die head and is extruded and formed from the spinneret plate at the die orifice at a uniform speed. The number of holes in the spinneret plate is 2319, the hole pitch is 3 mm, and the hole diameter is 0.30 mm.

[0020] S5. Drawing: Use a high-pressure blower to blow the heated high-pressure air downward along both sides of the spinneret plate. The high-pressure air has a temperature of 320 °C and a pressure of about 2 kg until the fiber filaments are drawn thin and long to complete the drawing process.

[0021] S6. Cooling: After the melt and polyester staple fibers are mixed and adhered together, natural cooling is achieved by adjusting the height between the forming screen and the extrusion die head. The height between the forming screen and the extrusion die head is controlled between 40 cm and 60 cm. After forming, polyester staple fibers are filled and mixed randomly, then non-woven fabric is attached to its surface to form a shape, and finally, it is cut and packaged.

[0022] The technical effects and advantages of the present invention:

[0023] 1. In the present invention, the prepared material has many excellent properties: the fiber fineness is slender, the structure is fluffy, it has a large surface area and cross-sectional density. At the same time, the material also exhibits good softness and excellent elasticity. Based on the above properties, the sound absorption and heat insulation effects of the sound absorption and heat insulation material made from it are significantly improved.

[0024] 2. Through the coordinated setting of the rotating cylinder, fixed shaft, control plate, stirring plate, and contact plate, the present invention drives the inner and outer layers of the material in the extrusion cylinder to be fully exchanged through the rotation of the stirring plate, promoting the all-round internal and external flipping of the material in the extrusion cylinder. During this process, the material between the inner wall of the extrusion cylinder and the outer wall of the rotating cylinder flips and exchanges, enabling each part of the material in the extrusion cylinder to be evenly heated, effectively avoiding the problem of uneven heating of the material, and being able to strongly guarantee the extrusion quality of the screw extrusion assembly and ensure that the surface of the produced product is smooth.

[0025] 3. Through the coordinated setting of the braking plate, feedback plate, vertical groove, sliding groove, sliding plate, and fourth spring, when the material in a certain interval forms lumps, the resistance received by the stirring plate in this interval during the stirring operation will increase significantly. This change in resistance will cause a chain reaction, resulting in a slowdown in the rotation speed of the stirring plates adjacent to this interval. When the stirring plates in the adjacent intervals temporarily stop rotating, they will act as a blocking effect on the advancement of the material in the extrusion cylinder. This blocking effect delays the pushing process of the material in the current interval where the lumped material is located to the next heating interval, allowing the material to have more sufficient time to be heated in a certain interval, thereby enabling the material to be fully plasticized, and further being able to effectively reduce the lumping phenomenon of the material and guarantee the processing quality of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the process flow chart of the present invention.

[0027] Figure 2 is the overall structural schematic diagram of the present invention.

[0028] Figure 3 is the full-sectional top view of the extrusion cylinder of the present invention.

[0029] Figure 4 For the present invention Figure 3 is the enlarged view of A.

[0030] Figure 5 is the exploded view of the extrusion cylinder and the rotating cylinder of the present invention.

[0031] Figure 6 is the structural schematic diagram of the rotating cylinder and the through groove of the present invention.

[0032] Figure 7 is the structural schematic diagram of the control plate, sliding plate, stirring plate, and contact plate of the present invention.

[0033] Figure 8 is the structural schematic diagram of the fixed shaft and the first cam of the present invention.

[0034] Figure 9 is the structural schematic diagram of the fixed shaft, second cam, and torsion spring of the present invention.

[0035] Figure 10 This is the main sectional view of the control board of the present invention.

[0036] Figure 11 This is the present invention Figure 10 An enlarged view of B in the present invention.

[0037] Figure 12 This is the structural schematic diagram of the stirring plate, rotating shaft, rotating rod, guiding column, wedge block and guiding plate of the present invention.

[0038] The reference numerals are: 1, screw extrusion assembly; 11, support frame; 12, extrusion barrel; 13, feeding assembly; 14, heating assembly; 15, rotating cylinder; 16, auger; 17, control board; 18, stirring plate; 19, reducer; 110, motor; 111, transmission shaft; 112, fixed shaft; 113, first cam; 114, second cam; 115, torsion spring; 116, through groove; 117, first spring; 118, contact plate; 119, baffle; 120, second spring; 121, relief groove; 122, rotating shaft; 123, rotating rod; 124, guiding column; 125, push rod; 126, transverse groove; 127, wedge block; 128, third spring; 129, guiding plate; 130, sliding groove; 131, sliding plate; 132, fourth spring; 133, feedback plate; 134, brake plate; 135, vertical groove; 2, hydraulic screen changer filter; 3, metering pump; 4, extrusion die head; 5, high-pressure blower; 6, forming screen. Specific embodiments

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0040] Embodiment 1

[0041] During the operation of the screw extrusion assembly, the material falls into the extrusion barrel and then undergoes a series of processes such as stirring, breaking, and heating in the extrusion barrel. In the prior art, by means of the reciprocating rotation of the electric heating sleeve and the heating plate in the heating mechanism, the material in the extrusion barrel is uniformly heated and plasticized to ensure the quality of the subsequent extruded products. However, in actual situations, the material falling into the extrusion barrel will produce a layering phenomenon in the barrel due to the influence of gravity. The material near the outer circle of the extrusion barrel can absorb more heat and thus be fully melted; but as the distance from the side wall of the extrusion barrel increases, the heat absorbed by the material gradually decreases, which leads to inconsistent heating degrees of the material in the inner and outer circles of the extrusion barrel, and further has an adverse impact on the extrusion quality of the material, resulting in an uneven surface of the extruded product and making the product defective and unqualified.

[0042] Please refer to Figures 2 to 12 As shown, the screw extrusion assembly 1 includes a support frame 11. A top of the support frame 11 is fixedly connected to an extrusion barrel 12. A top of the extrusion barrel 12 is communicated with a feeding assembly 13. A plurality of heating assemblies 14 are evenly distributed along a length direction on an outer edge surface of the extrusion barrel 12. A rotatable rotating cylinder 15 is arranged in the extrusion barrel 12. An auger 16 is arranged on an outer edge surface of the rotating cylinder 15. A plurality of control plates 17 are evenly distributed along the length direction in the rotating cylinder 15. The control plates 17 can extend out of an outer wall of the rotating cylinder 15. A stirring plate 18 for stirring materials is hinged in the control plates 17. When the stirring plate 18 encounters agglomerated materials during the stirring process, it can control the adjacent stirring plate 18 (the adjacent stirring plate 18 refers to the stirring plate 18 that is adjacent to and closest to the current stirring plate 18 in the direction away from the feeding assembly 13) to delay stirring, block the extrusion barrel 12, and extend the heating time of the material agglomeration section.

[0043] Please refer to Figure 2 As shown, a speed reducer 19 is arranged on the support frame 11. A motor 110 is arranged on the support frame 11. An output end of the motor 110 is connected to the speed reducer 19. An output end of the extrusion barrel 12 is connected to the speed reducer 19 through a transmission shaft 111. The speed reducer 19 can control the rotation of the rotating cylinder 15.

[0044] Please refer to Figure 3 , Figure 4 , Figure 8 and Figure 9 As shown, a fixed shaft 112 is coaxially and fixedly connected in the extrusion barrel 12. A first cam 113 is fixedly connected to a side of the fixed shaft 112 close to the feeding assembly 13. A plurality of second cams 114 are rotatably connected to a side of the fixed shaft 112 away from the feeding assembly 13. A circular groove is formed in the second cam 114. The circular groove is connected to the fixed shaft 112 through a torsion spring 115.

[0045] Please refer to Figures 2 to 9 As shown, a fixed shaft 112 is coaxially and fixedly connected in the extrusion barrel 12. A first cam 113 is fixedly connected to a side of the fixed shaft 112 close to the feeding assembly 13. A plurality of second cams 114 are rotatably connected to a side of the fixed shaft 112 away from the feeding assembly 13. A circular groove is formed in the second cam 114. The circular groove is connected to the fixed shaft 112 through a torsion spring 115.

[0046] Please refer to Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 8 and Figure 9As shown in the figure, a plurality of through grooves 116 corresponding to the control plates 17 one by one are formed in the side wall of the rotary drum 15. The control plates 17 are slidably connected to the through grooves 116 on their corresponding sides. One end of the control plate 17 close to the center of the rotary drum 15 is connected with a contact plate 118 through a plurality of first springs 117. One end of the contact plate 118 close to the center of the rotary drum 15 contacts the first cam 113 or the second cam 114 on its corresponding side. A baffle 119 is fixedly connected to the side wall of the control plate 17. The top of the baffle 119 is connected to the inner wall of the rotary drum 15 through a plurality of second springs 120.

[0047] Please refer to Figure 10 , Figure 11 and Figure 12 As shown in the figure, a relief groove 121 is formed at one end of the control plate 17 close to the feeding assembly 13. The stirring plate 18 is rotatably connected to the control plate 17 through a rotating shaft 122. One end of the rotating shaft 122 close to the feeding assembly 13 extends into the relief groove 121. Two rotating rods 123 are fixedly connected to one end of the rotating shaft 122 located in the relief groove 121. A guide post 124 is provided at one end of the rotating rod 123 close to the feeding assembly 13.

[0048] Please refer to Figures 10 to 12 As shown in the figure, a push rod 125 is provided at one end of the contact plate 118 close to the feeding assembly 13. One end of the push rod 125 close to the side wall of the rotary drum 15 extends into the relief groove 121. A transverse groove 126 located in the relief groove 121 is formed in the push rod 125. A wedge block 127 is slidably connected in the transverse groove 126. One end of the wedge block 127 close to the rotating shaft 122 is an inclined surface. The length of one end of the wedge block 127 close to the push rod 125 is less than the length of the end of the wedge block 127 away from the push rod 125. The wedge block 127 can contact the guide post 124. One end of the wedge block 127 close to the feeding assembly 13 is connected to the side wall of the relief groove 121 through a third spring 128. Two guide plates 129 are provided on one side of the wedge block 127 close to the rotating shaft 122.

[0049] In actual use, its initial state is that the upper end face of the wedge block 127 is located below the lower guide post 124. The elastic force of the first spring 117 is set to be greater than that of the second spring 120. The material enters the extrusion barrel 12 through the feeding assembly 13. The material is located between the extrusion barrel 12 and the rotating cylinder 15. As the motor 110 drives the rotating cylinder 15 to rotate through the speed reducer 19, the rotating cylinder 15 drives the auger 16 to rotate. The auger 16 pushes the material in the extrusion barrel 12 to move away from the feeding assembly 13. When the rotating cylinder 15 rotates, it can drive a plurality of control plates 17 to rotate synchronously. The control plate 17 drives the contact plate 118 to rotate through the first spring 117. The contact plate 118 rotates relative to the fixed shaft 112 and the first cam 113 or the second cam 114. The contact plate 118 moves away from the center of the rotating cylinder 15 under the push of the first cam 113 or the second cam 114 and compresses the second spring 120, so that the control plate 17 extends out of the through groove 116 on its corresponding side. The control plate 17 drives the stirring plate 18 and the sliding plate 131 to extend out of the rotating cylinder 15. At this time, the stirring plate 18 is located between the rotating cylinder 15 and the extrusion barrel 12. During the process of the control plate 17 moving away from the center of the rotating cylinder 15, the material inside the inner circle of the extrusion barrel 12 is disrupted.

[0050] As the contact plate 118 rotates relative to the first cam 113 or the second cam 114, the control plate 17 gradually moves away from the center of the rotating cylinder 15. When the control plate 17 contacts the inner wall of the extrusion barrel 12, as the first cam 113 or the second cam 114 continues to push the contact plate 118 to move away from the center of the rotating cylinder 15, the contact plate 118 moves relative to the control plate 17 on its corresponding side, so that the second spring 120 is compressed. The contact plate 118 drives the push rod 125 on its corresponding side to move upward away from the center of the rotating cylinder 15. The push rod 125 drives the wedge block 127 to move upward away from the center of the rotating cylinder 15. The wedge block 127 drives the guide plate 129 to push the guide post 124 to move away from the center of the rotating cylinder 15. The guide post 124 drives the rotating shaft 122 to rotate through the rotating rod 123. The rotating shaft 122 drives the stirring plate 18 to rotate. The stirring plate 18 stirs and flips the material between the outer wall of the rotating cylinder 15 and the inner wall of the extrusion barrel 12. When the wedge block 127 drives the guide post 124 to move to the limit position away from the center of the rotating cylinder 15, the rotating shaft 122 rotates 180 degrees. The stirring plate 18 drives the inner layer of the material to exchange with the outer layer, so that the material in the extrusion barrel 12 is turned inside out, and the material between the inner wall of the extrusion barrel 12 and the outer wall of the rotating cylinder 15 is flipped back and forth, making the material in the extrusion barrel 12 heat more evenly and avoiding uneven heating of the material in the extrusion barrel 12.

[0051] As the drum 15 rotates, the drum 15 drives the control plate 17 to rotate, and the control plate 17 drives the contact plate 118 to rotate via the second spring 120. When the effective pushing diameter of the first cam 113 or the second cam 114 decreases, since the elastic force of the second spring 120 is greater than the elastic force of the first spring 117, the contact plate 118 moves toward the center of the drum 15 under the action of the second spring 120. At this time, the control plate 17 does not move, and the contact plate 118 drives the push rod 125 to move relative to the control plate 17 toward the center of the drum 15. The push rod 125 drives the wedge block 127 and the guide plate 129 to move relative to the rotating shaft 122 and the guide column 124. The rotating drum 15 moves in a circular direction. When the contact plate 118 moves to the initial position relative to the control plate 17, the wedge block 127 moves to the extreme position in the clearance groove 121 toward the center of the rotating drum 15. During this process, the lower end surface of the wedge block 127 contacts the guide column 124 at one end of the center of the rotating drum 15. The guide column 124 pushes the wedge block 127 to move away from the guide column 124 and compresses the third spring 128. When the wedge block 127 moves to the initial position relative to the clearance groove 121, the wedge block 127 is disengaged from the guide column 124, and the wedge block 127 is reset under the action of the third spring 128, completing a flipping cycle.

[0052] Example 2

[0053] On the basis of the above embodiments, during the implementation of the meltblowing process, it is necessary to divide the operation into multiple heating areas. When the material is heated unevenly in the extruder barrel, the screw extrusion assembly always keeps pushing the material, and the material will clump due to uneven heating. These agglomerated materials continue to move forward under the continuous advancement of the screw extrusion assembly, and the current heating interval cannot identify the agglomerated materials, and it is impossible to extend the heating time in a targeted manner. Ultimately, the material agglomeration problem will have a negative impact on the extrusion quality of the screw extrusion assembly, resulting in product quality that is difficult to meet the expected standards.

[0054] See also Figure 3 、 Figure 4 and Figure 7 As shown, a slide groove 130 is provided at one end of the control plate 17 away from the feeding component 13, and a slide plate 131 is slidably connected in the slide groove 130. The end of the slide plate 131 away from the feeding component 13 contacts the side wall of the slide groove 130 through the fourth spring 132, and the end of the slide plate 131 close to the feeding component 13 contacts the stirring plate 18. The end of the slide plate 131 away from the feeding component 13 is fixedly connected to the feedback plate 133.

[0055] See also Figure 3 、 Figure 4 and Figure 7As shown, one end of the feedback plate 133 away from the feeding assembly 13 penetrates through the control plate 17. A plurality of brake plates 134 corresponding to the control plate 17 one by one are slidably connected in the rotating cylinder 15. Vertical grooves 135 with openings facing the feeding assembly 13 are formed in the brake plates 134. The feedback plate 133 is slidably connected with the vertical grooves 135. One side of the brake plate 134 away from the feeding assembly 13 can contact the adjacent second cam 114.

[0056] Please refer to Figure 12 As shown, the two longer end faces of the stirring plate 18 are inclined surfaces. The thickness of one end of the stirring plate 18 close to the feeding assembly 13 is less than the thickness of the end of the stirring plate 18 away from the feeding assembly 13.

[0057] On the basis of the above embodiments, when the materials in one of the heating zones agglomerate, the stirring plate 18 will encounter a greater resistance during stirring. Since the two longer end faces of the stirring plate 18 are inclined surfaces, and the thickness of one end of the stirring plate 18 close to the feeding assembly 13 is less than the thickness of the end of the stirring plate 18 away from the feeding assembly 13, when the stirring plate 18 rotates, due to the resistance of the materials acting on the inclined surface of the stirring plate 18, according to Newton's third law, the force generated by the resistance on the stirring plate 18 is in the direction away from the feeding assembly 13. That is, when the materials in a certain zone agglomerate, due to the greater resistance, the stirring plate 18 in a certain zone moves in the direction away from the feeding assembly 13. The stirring plate 18 drives the slide plate 131 on its corresponding side to move in the direction away from the feeding assembly 13 and compress the fourth spring 132. The slide plate 131 drives the feedback plate 133 to move in the direction away from the feeding assembly 13. The feedback plate 133 pushes the brake plate 134 on its corresponding side to move in the direction away from the feeding assembly 13, so that the brake plate 134 gradually approaches the adjacent second cam 114 and contacts the second cam 114, increasing the frictional force on the second cam 114. When the second cam 114 rotates relative to the contact plate 118 on its corresponding side, due to the increased frictional force on the second cam 114, when the second cam 114 rotates relative to the contact plate 118, the second cam 114 rotates relative to the fixed shaft 112, causing the torsion spring 115 to stretch. When the torsion spring 115 stretches to a certain amount, the second cam 114 can push the contact plate 118 on its corresponding side to move. Since the materials in a certain zone agglomerate and the resistance during stirring of the stirring plate 18 in a certain zone increases, the rotation of the stirring plate 18 in the adjacent zone is delayed. When the stirring plate 18 in the adjacent zone does not rotate, it can block the advancement of the materials in the extrusion cylinder 12, delaying the pushing of the materials in a certain zone into the next heating zone, making the heating effect of the materials better and effectively reducing the agglomeration phenomenon of the materials.

[0058] This application enables the stirring plate 18 to drive the materials in the inner layer to exchange with the outer layer, causing the materials in the extrusion barrel 12 to flip inside and outside, and the materials between the inner wall of the extrusion barrel 12 and the outer wall of the rotating cylinder 15 to be flipped back and forth, making the materials in the extrusion barrel 12 heat more evenly, avoiding uneven heating of the materials in the extrusion barrel 12. When the materials agglomerate in a certain area, the resistance increases when the stirring plate 18 in that area stirs, causing the stirring plate 18 in the adjacent area to delay rotation. When the stirring plate 18 in the adjacent area does not rotate, it can block the advancement of the materials in the extrusion barrel 12, delaying the pushing of the materials in a certain area into the next heating area, resulting in better heating effect of the materials and effectively reducing the agglomeration phenomenon of the materials.

[0059] Example Three

[0060] As Figure 1 shown, in order to increase the sound absorption and heat insulation effect, this embodiment provides a preparation method of YDB sound absorption and heat insulation material, including the following steps:

[0061] S1. Melting and extrusion: Using the screw extrusion assembly 1, setting the motor power to 18.6 kW, the motor speed to 1470 r / min, the melt index to 1500, and heating in five zones, namely the heating temperature of the first zone is 180 °C, the second zone is 200 °C, the third zone is 220 °C, the fourth zone is 240 °C, and the fifth zone is 250 °C;

[0062] S2. Filtration: Using the hydraulic screen changer filter 2 for filtration to ensure that the purity of the melt reaches 99.8% to ensure the smooth progress of spinning. The screen is a 300-mesh high-mesh screen, the pressure of the filtered melt is maintained at about 3 kg, and the heating temperature of the filter is 250 °C;

[0063] S3. Metering: Using the metering pump 3 with the model of 60 cc, controlling the product weight by adjusting the melt flow rate, and the heating temperature of the metering pump 3 is 230 °C;

[0064] S4. Fiber formation: Using the extrusion die head 4, which has eight heating zones on the die head. Since the fluidity of the melt is related to the temperature, the flow rate of the melt in each zone is adjusted by controlling the temperature of each zone. The temperatures on both sides of the extrusion die head 4 are relatively high, about 250 °C, while the temperature in the middle part is relatively low, about 200 °C, so that the plastic melt from the screw extrusion assembly 1 is well distributed in the flow channel of the extrusion die head 4 and extruded and formed from the spinneret plate at the die orifice at a uniform speed. The number of holes in the spinneret plate is 2319, the hole pitch is 3 mm, and the hole diameter is 0.30 mm;

[0065] S5. Stretching: Using the high-pressure blower 5 to blow the heated high-pressure air downward along both sides of the spinneret plate. The high-pressure air has a temperature of 320 °C and a pressure of about 2 kg until the fiber filaments are drawn thin and long to complete the stretching process;

[0066] S6. Cooling: After the melt and the polyester staple fibers are mixed and adhered together, they are naturally cooled by adjusting the height between the forming screen 6 and the extrusion die head 4. The height between the forming screen 6 and the extrusion die head 4 is controlled between 40 cm and 60 cm. After forming the web, polyester staple fibers are filled and randomly mixed, and then non-woven fabric is attached to its surface for molding. Finally, it is slit and packaged.

[0067] In this embodiment, the prepared material has many excellent properties: the fiber fineness is fine, the structure is fluffy, it has a large surface area and cross-sectional density. At the same time, the material also exhibits good softness and excellent elasticity. Based on the above properties, the sound absorption and heat insulation effects of the sound absorption and heat insulation material made from it are significantly improved.

[0068] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A preparation device for YDB sound-absorbing and heat-insulating material, comprising a screw extrusion assembly, characterized in that, The screw extrusion assembly includes a support frame, the top of the support frame is fixedly connected to an extrusion barrel, the top of the extrusion barrel is connected to a feeding assembly, a plurality of heating components are provided on the outer edge surface of the extrusion barrel and are evenly distributed along the length direction thereof, a rotatable rotating barrel is provided in the extrusion barrel, an auger is provided on the outer edge surface of the rotating barrel, a plurality of control plates are evenly distributed in the rotating barrel along the length direction thereof, the control plates are capable of extending out of the outer wall of the rotating barrel, a stirring plate for stirring the material is hingedly connected to the control plate, and when the stirring plate encounters agglomerated material during the stirring process, the stirring plate adjacent to the stirring plate can be controlled to delay stirring, thereby completing the blocking of the extrusion barrel and prolonging the heating time of the material agglomeration interval; A fixed shaft is coaxially fixedly connected in the extrusion barrel, a first cam is fixedly connected to the side of the fixed shaft close to the feeding assembly, and a plurality of second cams are rotatably connected to the side of the fixed shaft away from the feeding assembly, wherein a circular groove is formed on the second cam, and the circular groove is connected to the fixed shaft via a torsion spring; The side wall of the rotating drum is provided with a plurality of through slots corresponding to the control plates, the control plates being slidably connected to the through slots on the corresponding sides, the end of the control plate close to the center of the rotating drum being connected to a contact plate via a plurality of first springs, the end of the contact plate close to the center of the rotating drum being in contact with the first cam or the second cam on the corresponding side, a baffle being fixedly connected to the side wall of the control plate, the top of the baffle being connected to the inner wall of the rotating drum via a plurality of second springs; A clearance groove is formed at one end of the control plate close to the feed assembly, and the stirring plate is rotatably connected to the control plate via a rotating shaft, and the end of the rotating shaft close to the feed assembly extends into the clearance groove. Two rotating rods are fixedly connected to one end of the rotating shaft located in the clearance groove, and a guide column is provided at one end of the rotating rod close to the feed assembly; The contact plate is provided with a push rod at one end close to the feeding assembly, and the push rod is provided with an end close to the side wall of the rotating drum extending into the give way groove. The push rod is provided with a transverse groove located in the give way groove, and a wedge block is slidably connected in the transverse groove. The end of the wedge block close to the rotating shaft is an inclined surface, and the wedge block can contact the guide column. The end of the wedge block close to the feeding assembly is connected to the side wall of the give way groove via a third spring, and two guide plates are provided on the side of the wedge block close to the rotating shaft.

2. The preparation device of the YDB sound-absorbing and heat-insulating material according to claim 1, characterized in that, The support frame is provided with a reducer, the support frame is provided with a motor, the output end of the motor is connected to the reducer, the output end of the extruder is connected to the reducer via a transmission shaft, and the reducer can control the rotation of the drum.

3. The preparation device of the YDB sound-absorbing and heat-insulating material according to claim 2, characterized in that, A slide groove is provided at one end of the control plate away from the feeding component, a slide plate is slidably connected in the slide groove, the end of the slide plate away from the feeding component contacts the side wall of the slide groove via a fourth spring, the end of the slide plate close to the feeding component contacts the stirring plate, and the end of the slide plate away from the feeding component is fixedly connected to a feedback plate.

4. The preparation device of the YDB sound-absorbing and heat-insulating material according to claim 3, characterized in that, One end of the feedback plate away from the feeding assembly passes through the control plate, and a plurality of brake plates corresponding to the control plates are slidably connected in the rotating drum. A vertical groove with an opening toward the feeding assembly is provided on the brake plate, and the feedback plate is slidably connected to the vertical groove. The side of the brake plate away from the feeding assembly can contact the second cam adjacent to it.

5. The preparation device of the YDB sound-absorbing and heat-insulating material according to claim 4, characterized in that, The two longer end faces of the stirring plate are respectively inclined surfaces, and the thickness of the end of the stirring plate close to the feeding assembly is less than that of the end of the stirring plate far from the feeding assembly.

6. A preparation method of a YDB sound-absorbing and heat-insulating material, wherein the preparation method is carried out by using the preparation device of the YDB sound-absorbing and heat-insulating material as described in claim 5, and is characterized in that, The preparation method includes the following steps: S1. Melting and extrusion: Using a screw extrusion assembly, heating is carried out in five zones. The heating temperature of the first zone is 180°C, the second zone is 200°C, the third zone is 220°C, the fourth zone is 240°C, and the fifth zone is 250°C; S2. Filtration: Using a hydraulic screen changer filter for filtration to ensure that the purity of the melt reaches 99.8%; S3. Metering: Using a metering pump to control the product weight by adjusting the melt flow rate; S4. Fiber formation: Using an extrusion die head, adjusting the flow rate of the melt in each zone by controlling the temperature of each zone, so that the plastic melt from the screw extrusion assembly is well distributed in the flow channel of the extrusion die head and extruded and formed from the spinneret plate at the die orifice at a uniform speed; S5. Drawing: Using a high-pressure blower to blow the heated high-pressure air downward along both sides of the spinneret plate until the fiber filaments are drawn thin and long to complete the drawing process; S6. Cooling: After the melt and the polyester staple fibers are mixed and adhered together, natural cooling is achieved by adjusting the height between the forming screen and the extrusion die head. After forming, polyester staple fibers are filled and mixed up, and then non-woven fabric is attached to its surface for shaping. Finally, it is slit and packaged.

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