A method for preparing wear-resistant and antibacterial polylactic acid composite fiber

Abstract

This invention relates to the field of polylactic acid (PLA) fiber production technology, specifically a method for preparing wear-resistant and antibacterial PLA composite fibers, comprising the following steps: S1, adding the mixed antibacterial powder and PLA to a transfer cylinder, adding paraffin wax to a conveying pipe, and the conveying pipe driving the first and second helical blades to rotate, collecting the mixed powder and preventing powder overflow; S2, the mixed powder passes through the top plate into the mixing chamber, and the spreading pipe rotates with the conveying pipe and sprinkles paraffin wax particles; S3, the bottom plate moves closer to the top plate to compress the mixed powder and paraffin wax, making the powder and paraffin wax tightly bonded; S4, the bottom plate opens to feed the fully mixed material in the mixing chamber into the extruder. This invention guides the powder movement and restricts dust generation through the first helical blade, captures airborne particles through the second helical blade, and spreads paraffin wax particles through the spreading pipe. The bottom plate and top plate cooperate to compress the material, making the material adhere to the paraffin wax particles for subsequent extrusion.

Description

Technical Field

[0001] This invention relates to the field of polylactic acid fiber production technology, and more specifically to a method for preparing wear-resistant and antibacterial polylactic acid composite fibers. Background Technology

[0002] Polylactic acid composite fiber, also known as polylactide fiber, is a new type of biodegradable material with biocompatibility and degradability, and is widely used in medical, hygiene, and clothing fields.

[0003] According to the publication (announcement) number CN100422405C, published (announcement) date 2008-10-01, a method for producing antibacterial polylactic acid fiber is disclosed, including the following steps: ① Antibacterial powder treatment: Silver-containing inorganic ultrafine antibacterial powder with an average particle size of 0.05-1.0 micrometers is dried at 100-200℃ for 1-10 hours, and then kneaded with a surface treatment agent containing both oleophilic and hydrophilic groups in a kneader. After treatment, it is dried again at 80-160℃ for 1-5 hours; ② Antibacterial masterbatch preparation: Polylactic acid chips are crushed into granules and dried at 80-110℃ for 10-24 hours. Then, it is mixed with the antibacterial powder processed in step ①, wherein the amount of antibacterial powder added accounts for 5-60% of the weight of polylactic acid chips. A lubricant, accounting for 1-10% of the weight of the antibacterial powder, is then added. The mixture is injected into a twin-screw extruder for extrusion granulation to produce antibacterial polylactic acid masterbatch. The screw processing temperature is 190-260℃. ③ Polylactic acid antibacterial fiber manufacturing: Ordinary polylactic acid chips and the antibacterial masterbatch obtained in step ② are dried separately at 80-150℃ for 10-24 hours. After measurement, 5-100 parts by weight of ordinary polylactic acid chips are used per part by weight of antibacterial masterbatch and injected into the spinning box for spinning. The spinning temperature is 200-300℃ and the spinning winding speed is...

[0004] The nascent fibers obtained by spinning at a speed of 800–4000 m / min are then further processed by drawing to produce antibacterial polylactic acid fibers. The drawing speed is 800–1200 m / min, the hot plate temperature is 70–90℃, and the hot plate temperature is 120–135℃. This method has the following advantages: good spinning formation and excellent fiber quality; the product has broad-spectrum antibacterial properties and is durable and washable, with an inhibition rate of over 60.0% against Staphylococcus aureus and over 90.0% against Candida albicans; its raw materials come from natural renewable green plants, and the product is biodegradable, belonging to green, environmentally friendly, and healthy fibers.

[0005] In existing technologies, including the aforementioned patents, the production process of wear-resistant and antibacterial polylactic acid (PLA) fibers requires the preparation of antibacterial powder, mixing the antibacterial powder with PLA, adding a lubricant to bind the antibacterial powder and PLA together, extruding it into granules to produce antibacterial masterbatch, and then spinning the antibacterial masterbatch and PLA chips in a spinning box in a specific ratio to obtain antibacterial PLA composite fibers. To ensure thorough mixing of the antibacterial powder and PLA, these two powders are typically mixed in a high-speed powder mixer. The lubricant is usually #60 paraffin wax. However, due to its low melting point, soft texture, and certain viscosity, paraffin wax cannot be mixed with the antibacterial powder and PLA in a high-speed powder mixer and must be mixed separately. Since both the antibacterial powder and PLA are micron-sized, conventional low-speed mixing methods easily lead to powder dispersion, wasting materials and potentially affecting the health of workers. Summary of the Invention

[0006] The purpose of this invention is to provide a method for preparing wear-resistant and antibacterial polylactic acid composite fibers, aiming to solve the above-mentioned problems.

[0007] To achieve the above objectives, the present invention provides a method for preparing wear-resistant and antibacterial polylactic acid composite fibers, comprising a transfer cylinder, a conveying pipe rotatably mounted on the transfer cylinder, a mixing chamber at the bottom of the transfer cylinder with its upper and lower ends respectively closed by a top plate and a bottom plate, a first helical blade with its side tightly attached to the inner wall of the transfer cylinder and spiraling downwards, and a second helical blade located on the first helical blade and spiraling in the opposite direction, and a dispensing pipe extending into the mixing chamber is movably mounted at the bottom of the conveying pipe, and the method further comprising the following steps:

[0008] S1. The mixed antibacterial powder and polylactic acid are put into the transfer cylinder, and the paraffin is put into the conveying pipe. The conveying pipe drives the first and second spiral blades to rotate, gather the mixed powder, and restrict the powder from overflowing.

[0009] S2. The mixed powder passes through the top plate and enters the mixing chamber. The sprinkling pipe rotates with the conveying pipe and sprinkles paraffin particles.

[0010] S3. The bottom plate moves closer to the top plate to compress and mix the powder and paraffin wax, so that the powder and paraffin wax are tightly bonded together.

[0011] S4. Open the bottom plate to feed the fully mixed material in the mixing chamber into the extruder.

[0012] Preferably, the number of spiral turns of the first helical blade is greater than 2.

[0013] Preferably, the second helical blade has 0.5 helical turns.

[0014] Preferably, the spreading pipe is coupled to the side wall of the mixing chamber so that it rotates with the conveying pipe and moves up and down reciprocally.

[0015] Preferably, the inner wall of the mixing chamber is provided with a plurality of second guide grooves connected in sequence and used to guide the movement of the dispensing pipe.

[0016] Preferably, the inside of the spreading pipe is provided with an impeller for pushing materials, and the spreading pipe moves along the second guide groove to make the impeller rotate.

[0017] Preferably, the material spreading pipe is provided with a baffle plate for blocking its discharge port and facing the opposite direction of the rotation direction of the material spreading pipe.

[0018] Preferably, the transfer cylinder has a mounting frame that is slidably provided inside to support the base plate, and the material conveying pipe rotates to make the mounting frame move up and down reciprocally.

[0019] Preferably, the base plate is composed of multiple sector-shaped blocks, and the bottom of the mixing chamber is provided with a first guide slope and a second guide slope for guiding the multiple sector-shaped blocks to converge.

[0020] Preferably, the top plate has a channel for powder to pass through, and the mounting bracket is moved to the connection between the first guide slope and the second guide slope to open the channel.

[0021] In the above technical solution, the method for preparing wear-resistant and antibacterial polylactic acid composite fiber provided by the present invention has the following beneficial effects: During the production of antibacterial masterbatch, antibacterial powder and polylactic acid are first added to a high-speed powder mixer in a certain proportion and thoroughly mixed. Then, the mixed powder is fed into a transfer cylinder through the feed inlet, and the feed inlet is sealed to prevent powder scattering. At this time, the motor outputs torque to drive the drive wheel to rotate. The drive wheel, through a meshing transmission wheel, drives the conveying pipe to rotate. The conveying pipe drives the first and second spiral blades to rotate. The first spiral blade pushes the material downwards, and the first spiral blade and the inner wall of the transfer cylinder form a spiral downward channel, guiding the material movement while restricting the upward movement of dust generated during material movement. Simultaneously, because the spiral direction of the second spiral blade is opposite to that of the first spiral blade... The blades rotate in opposite directions. As the second helical blade rotates with the first helical blade, it collides with the air in the upper chamber of the central rotating cylinder, thereby promoting the sedimentation of powder in the air and improving the utilization rate of materials. The material moves downward along the central rotating cylinder and enters the mixing chamber through the channel on the top plate. At this time, paraffin granules are put into the conveying pipe. The paraffin granules enter the spreading pipe along the conveying pipe. The spreading pipe sprays the paraffin granules as the conveying pipe rotates, so that the paraffin granules and powder materials are fully mixed. At the same time, the bottom plate moves closer to the top plate, compressing the internal space of the mixing chamber and squeezing the material, so that the powder material and adjacent paraffin granules are tightly combined, reducing the dust generated by the subsequent material movement. After the mixing work is completed, the bottom plate moves downward and gradually leaves the mixing chamber. At this time, the material in the mixing chamber falls into the extruder. The extruder squeezes the material into granules to manufacture antibacterial masterbatch. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Figure 1 This is a schematic diagram of the overall structure provided in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic cross-sectional view of the mixing chamber provided in an embodiment of the present invention;

[0026] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0027] Figure 5 for Figure 3 Enlarged view at point B in the middle;

[0028] Figure 6 This is a schematic diagram of the internal structure of the conveying pipe provided in an embodiment of the present invention;

[0029] Figure 7 for Figure 6 Enlarged view at point C;

[0030] Figure 8 This is a schematic diagram of the internal structure of the connecting pipe provided in an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the structure of the material spreading pipe provided in an embodiment of the present invention;

[0032] Figure 10 This is a schematic diagram of the internal structure of the material spreading pipe provided in an embodiment of the present invention;

[0033] Figure 11 for Figure 10 Enlarged view at point D;

[0034] Figure 12 This is a schematic diagram of the structure of the turntable provided in an embodiment of the present invention;

[0035] Figure 13 This is a schematic diagram of the unfolded structure of the mixing chamber sidewall provided in an embodiment of the present invention.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Transmission cylinder; 11. Conveying pipe; 111. First spiral blade; 112. Second spiral blade; 113. Feeding plate; 114. Drive wheel; 115. Turntable; 116. Slider; 117. First cable; 12. Connecting pipe; 121. Synchronizing block; 122. Dispensing pipe; 123. Baffle; 124. Impeller; 125. Guide block; 126. First gear; 127. Second gear; 128. Pusher plate; 129. Leakage... 13. Pressure valve; 13. Mixing chamber; 131. Top plate; 132. Sealing ring; 133. Mounting bracket; 134. Bottom plate; 135. Push rod; 136. Movable block; 137. Second cable; 138. First guide slope; 139. Second guide slope; 141. First guide groove; 142. Second guide groove; 143. Inner ring; 144. Outer ring; 145. First inclined groove; 146. Second inclined groove; 147. Third inclined groove; 15. Feed inlet. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0039] like Figure 1-13As shown, a method for preparing wear-resistant and antibacterial polylactic acid composite fiber includes a transfer cylinder 1, a conveying pipe 11 rotatably mounted on the transfer cylinder 1, a mixing chamber 13 at the bottom of the transfer cylinder 1 with its upper and lower ends respectively closed by a top plate 131 and a bottom plate 134, a first spiral blade 111 with its side tightly attached to the inner wall of the transfer cylinder 1 and spiraling downwards and a second spiral blade 112 located on the first spiral blade 111 and spiraling in the opposite direction, and a sprinkling pipe 122 extending into the mixing chamber 13 movably mounted at the bottom of the conveying pipe 11. The method also includes the following steps:

[0040] S1. The mixed antibacterial powder and polylactic acid are put into the transfer cylinder 1, and the paraffin is put into the conveying pipe 11. The conveying pipe 11 drives the first spiral blade 111 and the second spiral blade 112 to rotate, gather the mixed powder, and restrict the powder from overflowing.

[0041] S2. The mixed powder passes through the top plate 131 and enters the mixing chamber 13. The sprinkling pipe 122 rotates with the conveying pipe 11 and sprinkles paraffin particles.

[0042] S3, the bottom plate 134 moves closer to the top plate 131 to compress and mix the powder and paraffin, so that the powder and paraffin are tightly bonded together;

[0043] S4. The bottom plate 134 is opened to feed the fully mixed material in the mixing chamber 13 into the extruder.

[0044] Specifically, the top of the transfer cylinder 1 is provided with a feed inlet 15, the top of the transfer cylinder 1 is provided with a motor, the output end of the motor is provided with a drive wheel, the conveying pipe 11 is provided with a transmission wheel 114 that meshes with the drive wheel, and the top plate 131 is provided with a sealable channel for materials to pass through.

[0045] In the above technical solution, during the production of antibacterial masterbatch, antibacterial powder and polylactic acid are first added to a high-speed powder mixer in a certain proportion and thoroughly mixed. Then, the mixed powder is fed into the intermediate drum 1 through the feed inlet 15, and the feed inlet 15 is sealed to prevent powder escape. At this time, the motor outputs torque to drive the drive wheel to rotate. The drive wheel, through the meshing transmission wheel 114, drives the conveying pipe 11 to rotate. The conveying pipe 11 drives the first spiral blade 111 and the second spiral blade 112 to rotate. The first spiral blade 111 pushes the material downwards, and the first spiral blade 111 and the inner wall of the intermediate drum 1 form a spiral downward channel, guiding the material movement while restricting the upward movement of dust generated during material movement. Simultaneously, since the spiral direction of the second spiral blade 112 is opposite to that of the first spiral blade 111, the second spiral blade 112 follows the first spiral blade 111... During the rotation of the spiral blades 111, they collide with the air in the upper chamber of the intermediate drum 1, thereby promoting the sedimentation of powder in the air and improving the utilization rate of materials. The materials move downward along the intermediate drum 1 and enter the mixing chamber 13 through the channel on the top plate 131. At this time, paraffin particles are put into the conveying pipe 11. The paraffin particles enter the spreading pipe 122 along the conveying pipe 11. The spreading pipe 122 sprays the paraffin particles as the conveying pipe 11 rotates, so that the paraffin particles and powder materials are fully mixed. At the same time, the bottom plate 134 moves closer to the top plate 131, compressing the internal space of the mixing chamber 13 and squeezing the materials, so that the powder materials are tightly combined with the adjacent paraffin particles, reducing the dust generated by the subsequent material movement. After the mixing work is completed, the bottom plate 134 moves downward and gradually leaves the mixing chamber 13. At this time, the materials in the mixing chamber 13 fall into the extruder. The extruder squeezes the materials into granules to manufacture antibacterial masterbatch.

[0046] As a further embodiment of the present invention, the number of spiral turns of the first helical blade 111 is greater than 2.

[0047] Specifically, the number of spiral turns of the channel formed by the first spiral blade 111 and the inner wall of the transfer cylinder 1 is greater than 2. The spiral channel extends the path of dust movement, which not only ensures that the material can move downward smoothly, but also increases the possibility of dust colliding with the spiral channel, thereby increasing the possibility of dust settling due to collision with the spiral channel and improving material utilization efficiency.

[0048] As another embodiment of the present invention, the second helical blade 112 has 0.5 helical turns.

[0049] Specifically, the second helical blade 112 is shorter and will not completely cover the top of the first helical blade 111. This ensures that most of the material falling from above can directly contact the first helical blade 111 and be guided downwards by the first helical blade 111. Another part of the material will also move along the inclined second helical blade 112 to the first helical blade 111 and then merge with other materials.

[0050] Furthermore, in the above embodiment, an intermittently operating electrostatic generator can be connected to the second helical blade 112. The electrostatic generator causes the second helical blade 112 to become electrostatically charged. When the second helical blade 112 rotates, it can electrostatically attract powder in the air. When the electrostatic generator stops working, the electrostatic charge on the second helical blade 112 gradually decays, and the powder attached to it can fall along the second helical blade 112 onto the first helical blade 111 and move downwards along the first helical blade 111.

[0051] As another embodiment of the present invention, the feeding pipe 122 is coupled to the side wall of the mixing chamber 13 so that it rotates with the feeding pipe 11 and moves up and down reciprocally.

[0052] Specifically, a connecting pipe 12 for supporting the spreading pipe 122 is slidably provided at the bottom of the spreading pipe 122, and the spreading pipe 122 is arranged obliquely downward. A square synchronization block 121 is provided on the connecting pipe 12. A sliding groove adapted to the synchronization block 121 is opened on the inner wall of the spreading pipe 122. A slope is provided inside the connecting pipe 12, and the slope guides the paraffin particles into the spreading pipe 122.

[0053] Furthermore, during the rotation of the spreading pipe 122, the spreading pipe 122 drives the connecting pipe 12 to rotate through the synchronizing block 121. The spreading pipe 122 rotates with the connecting pipe 12 and the conveying pipe 11 is coupled with the side wall of the mixing chamber 13, thereby driving the spreading pipe 122 to move up and down reciprocally while rotating, so as to spread the paraffin particles relatively evenly in the mixing chamber 13. Moreover, the spreading pipe 122, which is arranged obliquely downward, can only spread the paraffin in the middle and lower part of the mixing chamber 13, avoiding spreading the paraffin particles in the upper part of the mixing chamber 13. This prevents the material in the mixing chamber 13 from being stuck to the top plate 131 by the paraffin particles when the material is under pressure.

[0054] As another embodiment of the present invention, the inner wall of the mixing chamber 13 is provided with a plurality of second guide grooves 142 connected in sequence and used to guide the movement of the spreading pipe 122.

[0055] Specifically, the second guide channel 142 is composed of multiple V-shaped channels connected in sequence, and the feeding pipe 122 is provided with a guide block 125 adapted to the second guide channel 142.

[0056] Furthermore, as the connecting pipe 12 and the spreading pipe 122 rotate with the conveying pipe 11, the guide block 125 moves in the second guide groove 142. The second guide groove 142 guides the guide block 125 to move up and down along multiple V-shaped grooves, thereby driving the connecting pipe 12 and the spreading pipe 122 to rotate and move up and down at the same time. This allows the paraffin particles sprinkled by the spreading pipe 122 in the mixing chamber 13 to be fully mixed with the powder material on multiple sequentially connected and oppositely oriented spiral surfaces.

[0057] As another embodiment of the present invention, the inside of the spreading pipe 122 is provided with an impeller 124 for pushing materials, and the spreading pipe 122 moves along the second guide groove 142 to make the impeller 124 rotate.

[0058] Specifically, a first gear 126 is rotatably mounted on the guide block 125. The shaft of the first gear 126 extends into the interior of the feeding pipe 122 and is rotatably mounted with a second gear 127 that meshes with the gear teeth on the impeller 124. A rack that meshes with the first gear 126 is provided in the second guide groove 142. A discharge port is provided on the side wall of the feeding pipe 122. A self-springing telescopic rod is provided at the bottom of the connecting pipe 12 (this is prior art and will not be described in detail). A pusher plate 128 for stirring the material in the mixing chamber 13 is provided at the bottom of the self-springing telescopic rod. A pressure relief valve 129 that communicates with its internal space and only allows air to pass through is provided at the bottom of the connecting pipe 12.

[0059] Furthermore, the impeller 124 is located inside the cavity of the dispensing pipe 122 and divides it into multiple chambers for storing paraffin particles. During the rotation of the connecting pipe 12, the guide block 125 moves along the second guide groove 142, and the first gear 126 is pushed to rotate by the rack in the second guide groove 142. The first gear 126 drives the impeller 124 to rotate through the second gear 127. The impeller 124 pushes the paraffin particles in the dispensing pipe 122 towards the outlet. Under the action of gravity, the paraffin particles fall outside the dispensing pipe 122 and mix with the mixing chamber 13. The materials in the mixing chamber 13 are mixed, and the pusher plate 128 rotates with the connecting pipe 12, stirring the materials in the mixing chamber 13 and mixing them thoroughly. As the bottom plate 134 moves closer to the top plate 131, the materials and air in the mixing chamber 13 are squeezed. At this time, the air in the storage chamber can be discharged into the connecting pipe 12 through the pressure relief valve 129 to avoid excessive air pressure inside the mixing chamber 13, which would hinder the bottom plate 134 from moving closer to the top plate 131. The airflow discharged by the pressure relief valve 129 can also push the materials in the connecting pipe 12, preventing the materials in the connecting pipe 12 from having a bridging effect and affecting the falling of the materials.

[0060] As another embodiment of the present invention, the feeding pipe 122 is provided with a baffle 123 for blocking the discharge port on it and facing the opposite direction of the rotation direction of the feeding pipe 122.

[0061] Specifically, the baffle 123 completely covers the discharge port. During the movement of the spreading pipe 122, the baffle 123 moves synchronously with the spreading pipe 122 and forms a temporary cavity on the outside of the spreading pipe 122. The impeller 124 can push some of the paraffin particles in the spreading pipe 122 from the discharge port to the outside of the spreading pipe 122. As the spreading pipe 122 continues to move, the paraffin particles on the outside of the spreading pipe 122 will remain in place and be surrounded by the powder material in the mixing chamber 13, and then mix with the powder material.

[0062] As another embodiment of the present invention, the interior of the transfer cylinder 1 is slidably provided with a mounting frame 133 for supporting the base plate 134, and the material conveying pipe 11 rotates to make the mounting frame 133 move up and down reciprocally.

[0063] Specifically, a slider 116 is slidably arranged inside the transfer cylinder 1, and a first cable 117 is arranged between the slider 116 and the mounting frame 133. A turntable 115 that meshes with the transmission wheel 114 is rotatably arranged inside the transfer cylinder 1. A first guide groove 141 for guiding the movement of the first cable 117 is opened on the turntable 115. A spring is arranged between the mounting frame 133 and the transfer cylinder 1. When the mounting frame 133 is at its lowest point, the spring is in its initial state.

[0064] Furthermore, during the rotation of the conveying pipe 11, the conveying pipe 11 drives the turntable 115 to rotate through the transmission wheel 114. The first guide groove 141 on the turntable 115 pushes the slider 116 to move closer to the center of the turntable 115. The slider 116 drives the mounting frame 133 and the base plate 134 to move upward through the first cable 117, and the spring between the mounting frame 133 and the central rotating cylinder 1 is stretched to accumulate elastic potential energy.

[0065] As another embodiment of the present invention, the bottom plate 134 is composed of a plurality of sector blocks, and the bottom of the mixing chamber 13 is provided with a first guide slope 138 and a second guide slope 139 for guiding the plurality of sector blocks to converge.

[0066] Specifically, the sector-shaped block is equipped with tenons (such as...). Figure 2 and 4 As shown, the mounting bracket 133 has a mortise that matches the tenon block, a spring is provided between the tenon block and the mounting bracket 133, and a rubber layer is provided on the side wall adjacent to the fan-shaped block.

[0067] Furthermore, when the mounting frame 133 is at its lowest point, the sector blocks move away from each other under the action of the springs. At this time, the bottom plate 134 is dispersed, and the bottom of the mixing chamber 13 is in an open state. As the mounting frame 133 moves upward, the sector blocks are pushed by the second guide slope 139 and gradually move closer together. When the sector blocks move to the connection between the second guide slope 139 and the first guide slope 138, multiple sector blocks come together to form the bottom plate 134, sealing the bottom of the mixing chamber 13. The mounting frame 133 continues to move upward with the sector blocks. The sector blocks move along the first guide slope 138, and the rubber layers between the sector blocks are squeezed, and the connection between the sector blocks becomes tighter, so that the bottom plate 134 composed of multiple sector blocks has sufficient load-bearing capacity and avoids gaps when the bottom plate 134 squeezes the material in the mixing chamber 13.

[0068] As another embodiment of the present invention, a channel for powder to pass through is provided on the top plate 131, and the mounting bracket 133 is moved to the connection of the first guide slope 138 and the second guide slope 139 to open the channel.

[0069] Specifically, a sealing ring 132 for closing the channel on the top plate 131 is rotatably mounted on it. The sealing ring 132 has multiple through holes that fit the channel on the top plate 131. A push rod 135 is mounted on the mounting bracket 133. A movable block 136 for pulling the sealing ring 132 to rotate is slidably mounted inside the transfer cylinder 1. A cable is provided between the movable block 136 and the sealing ring 132. A torsion spring is provided between the sealing ring 132 and the top plate 131. A material feeding device is provided on the conveying pipe 11 that is close to the top surface of the top plate 131. Plate 113, the second guide groove 142 includes an inner ring 143 and an outer ring 144. The first end of the inner ring 143 is provided with a first inclined groove 145, and the first end of the outer ring 144 is provided with a second inclined groove 146. The first inclined groove 145 is connected to the second inclined groove 146. A third inclined groove 147 is provided between the second end of the outer ring 144 and the second end of the inner ring 143. The arc of the disk corresponding to the second inclined groove 146 is smaller, the arc of the disk corresponding to the first inclined groove 145 is larger, and the arc corresponding to the third inclined groove 147 is also smaller.

[0070] Furthermore, when the mounting bracket 133 is at its lowest point, the slider 116 is in the outer ring 144 of the second guide groove 142. As the turntable 115 rotates, the slider 116 gradually moves from the outer ring 144 into the second inclined groove 146. Since the arc corresponding to the second inclined groove 146 is smaller, the second inclined groove 146 pushes the slider 116 towards the center of the disc at a faster speed. This, in turn, pulls the mounting bracket 133 upwards via the first cable 117. The fan-shaped blocks on the mounting bracket 133 move along the second guide slope 139 and gradually converge. When the slider 116... When the 6-axis moves to the connection between the second inclined chute 146 and the first inclined chute 145, the sector block moves to the connection between the second guide slope 139 and the first guide slope 138. Multiple sector blocks come together to form the bottom plate 134, sealing the bottom of the mixing chamber 13. The push rod 135 contacts the movable block 136, and the push rod 135 pushes the movable block 136 upward. The movable block 136 drives the sealing ring 132 to rotate through the second cable 137. The notch on the sealing ring 132 gradually aligns with the channel on the top plate 131. At this time, the powder material above the top plate 131 can... The material enters the mixing chamber 13 through this channel, and the conveying pipe 11 pushes the powder material through the feeding plate 113, accelerating the powder material's entry into the mixing chamber 13. The mounting frame 133 continues to move upward, and the slider 116 moves slowly towards the center of the turntable 115 along the first inclined groove 145. The fan-shaped block moves along the first guide slope 138 and continues to move closer. The movable block 136 continues to pull the sealing ring 132 to rotate. The notch on the sealing ring 132 is misaligned with the channel on the top plate 131, and the bottom plate 134 moves towards the top plate 131, squeezing the material in the mixing chamber 13. Until the slider 116 enters the inner ring 143, the mounting bracket 133 moves to the highest point; the turntable 115 continues to rotate, the slider 116 quickly returns to the outer ring 144 along the third inclined groove 147, and the mounting bracket 133 moves quickly downward under the action of the spring so that the sealing ring 132 can be quickly reset, avoiding too much material from the top plate 131 falling into the mixing chamber 13, and the fan-shaped block is dispersed under the action of the spring. The material in the mixing chamber 13 falls into the extruder and is extruded into granules by the extruder to produce antibacterial masterbatch, which is convenient for subsequent spinning work.

[0071] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A method for preparing wear-resistant and antibacterial polylactic acid composite fiber, characterized in that, The utility model provides a kind of mixing device, including middle transfer cylinder, material conveying pipe is rotatably arranged on middle transfer cylinder, the bottom of middle transfer cylinder is provided with mixing cavity, which is closed by top plate and bottom plate at upper and lower ends respectively, the middle part of material conveying pipe is provided with first helical blade that side is close to the inner wall of middle transfer cylinder and spirally downward and second helical blade that is located on first helical blade and the helical direction is opposite, the bottom of material conveying pipe is movably provided with scattering pipe that extends into mixing cavity, a plurality of second guide grooves for guiding the movement of scattering pipe are formed on the inner wall of mixing cavity, the second guide groove is composed of a plurality of V-shaped grooves connected in sequence, guide block that is matched with second guide groove is arranged on scattering pipe, impeller for pushing material is arranged in the inside of scattering pipe, scattering pipe moves along second guide groove to make impeller rotate, first gear is rotatably arranged on guide block, the shaft rod of first gear extends into the inside of scattering pipe and is rotatably provided with second gear that is engaged with the gear teeth on impeller, rack that is engaged with first gear is arranged in second guide groove, discharge port is formed on the sidewall of scattering pipe, self-rebound telescopic rod is arranged at the bottom of connecting pipe, pushing plate for stirring material in mixing cavity is arranged at the bottom of self-rebound telescopic rod, pressure relief valve that communicates with the internal space of connecting pipe and only allows air to pass through is arranged at the bottom of connecting pipe, and the following steps are included: S1, the mixed antibacterial powder and polylactic acid are put into the middle transfer cylinder, the paraffin is put into the material conveying pipe, and the first helical blade and the second helical blade are driven to rotate by the material conveying pipe, the mixed powder is gathered, and the overflow of the powder is limited; S2, the mixed powder passes through the top plate into the mixing cavity, the scattering pipe rotates with the material conveying pipe and scatters paraffin particles; S3, the bottom plate approaches the top plate to extrude the mixed powder and the paraffin, so that the powder is closely combined with the paraffin; S4, the bottom plate is opened to put the fully mixed material in the mixing cavity into the extruder.

2. The method of claim 1, wherein the abrasion-resistant antibacterial polylactic acid composite fiber is characterized by, The number of helical turns of the first helical blade is greater than 2.

3. The method for preparing wear-resistant and antibacterial polylactic acid composite fiber according to claim 1, characterized in that, The number of helical turns of the second helical blade is 0.

5.

4. The method for preparing wear-resistant and antibacterial polylactic acid composite fiber according to claim 1, characterized in that, The scattering pipe is coupled with the sidewall of the mixing cavity to rotate with the material conveying pipe and reciprocate up and down.

5. A method for preparing wear-resistant and antibacterial polylactic acid composite fiber according to claim 1, characterized in that, A baffle is arranged on the scattering pipe to shield the discharge port thereon and face the opposite direction of the rotation direction of the scattering pipe.

6. A method for preparing wear-resistant and antibacterial polylactic acid composite fiber according to claim 1, characterized in that, A mounting bracket for supporting the bottom plate is slidably arranged in the inside of the middle transfer cylinder, and the material conveying pipe rotates to make the mounting bracket reciprocate up and down.

7. A method for preparing wear-resistant and antibacterial polylactic acid composite fiber according to claim 6, characterized in that, The bottom plate is composed of a plurality of sector blocks, and the bottom of the mixing cavity is provided with a first guide slope and a second guide slope for guiding the approach of the plurality of sector blocks.

8. A method for preparing wear-resistant and antibacterial polylactic acid composite fiber according to claim 7, characterized in that, A channel is formed in the top plate for the powder to pass through, and the mounting bracket moves to the connection of the first guide slope and the second guide slope to open the channel.

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