A device and method for producing drip irrigation tape with a casing

Abstract

This invention belongs to the field of drip irrigation tape manufacturing technology, and particularly relates to a drip irrigation tape production device and manufacturing method. Addressing the problems of asynchronous traction and a single cooling method in existing drip irrigation tape production, the following solution is proposed: It includes an extruder and a set of production components connected to its discharge end. The set of production components includes a blow molding die, a cooling unit, an opening unit, and a negative pressure synchronization unit. The cooling unit adopts a structure combining an air-cooled inner tube and a hollow water-cooled outer tube. The air-cooled inner tube has three air chambers (high temperature, normal temperature, and low temperature) to achieve segmented cooling of the inner wall. The hollow water-cooled outer tube uses water jets of different pressures from its upper and lower chambers to achieve cooling of the outer wall and hydraulic suspension and centering. The negative pressure synchronization unit uses a hollow negative pressure plate attached to the water outlet area to generate negative pressure, adsorbing the drip irrigation tape to the wall for synchronous traction. This achieves integrated continuous operation of outer tube extrusion, drip irrigation tape insertion, balanced cooling, and synchronous traction, resulting in high production efficiency and stable pipe quality.

Description

Technical Field

[0001] This invention relates to a drip irrigation tape production device, specifically a casing drip irrigation tape production device and manufacturing method, belonging to the field of casing drip irrigation tape preparation technology. Background Technology

[0002] Drip irrigation tape is a type of plastic pipe widely used in agricultural water-saving irrigation. Its structure typically includes a water delivery channel for conveying water and a labyrinthine flow channel or patch-type dripper for controlling flow rate. In the structure of sleeve-type drip irrigation tape, the outer layer is a protective tube with a certain strength (outer sleeve), and the inner layer is the drip irrigation tape for controlling flow rate. The outer layer's function is to protect the inner layer from mechanical damage and soil burial. Currently, the production of sleeve-type drip irrigation tape usually adopts a step-by-step method: first, the outer tube is extruded; after it cools and sets, the inner drip irrigation tape is manually or semi-automatically inserted into the outer tube; finally, perforations are made in the outer tube after the inner tube has been inserted. This step-by-step production method has obvious technical defects: First, the secondary tube threading process is inefficient and requires a lot of manual operation. During the threading process, the inner tube is prone to twisting, jamming, or stretching, which causes the relative position of the inner tube and the outer tube to shift, affecting the accuracy of subsequent hole alignment. Second, the separation of the tube threading and hole-making processes in step-by-step production increases the cost of inter-process transfer and storage, and also increases the risk of contamination of the inner tube before threading. Third, when punching holes in the already threaded composite tube, the punching device can often only punch from the outside of the outer tube. The punch can easily damage the inner tube or push the inner tube to the other side, causing the water outlet to be misaligned with the water outlet of the drip irrigation tape, or even blocking the water outlet channel.

[0003] To address the aforementioned issues, some existing technologies have integrated extrusion and pipe insertion. For example, by adding a pipe insertion channel to the extruder die, the inner pipe is inserted simultaneously with the outer pipe, and then a post-installed punching device punches holes in the outer pipe. However, these integrated solutions typically only water-cool the outer wall, leading to inconsistent cooling rates between the inner and outer walls of the outer pipe. This results in sag and internal stress, causing uneven pipe wall thickness and excessive roundness. Furthermore, the inner and outer pipes are prone to speed discrepancies during traction, causing the inner pipe to be elongated or wrinkled, affecting irrigation uniformity. Therefore, developing a pipe-type drip irrigation tape production device that integrates outer pipe extrusion, simultaneous drip tape insertion, balanced cooling of inner and outer walls, synchronous negative pressure traction, and directional winding is a pressing technical problem in this field. Summary of the Invention

[0004] This invention provides a casing drip irrigation tape production device and manufacturing method to solve the problems of asynchronous traction and limited cooling methods in the production of existing casing drip irrigation tapes.

[0005] The present invention achieves the above objectives through the following technical solution: a drip irrigation tape production device, comprising an extruder and a set production assembly connected to the discharge end of the extruder, the set production assembly comprising a blow molding die, the material extruded by the extruder being extruded and plasticized into an outer tube through the blow molding die, the drip irrigation tape being sleeved inside the outer tube, and the drip irrigation tape being movable through the blow molding die; the set production assembly is provided with a cooling unit, an opening unit and a negative pressure synchronization unit in sequence along the extrusion and plasticization direction of the outer tube; The cooling unit includes an air-cooled inner tube located inside the outer tube and a hollow water-cooled outer tube located outside the outer tube. The air-cooled inner tube has a high-temperature air cavity, a normal-temperature air cavity, and a low-temperature air cavity sequentially opened inside the tube along the extrusion and plasticizing direction of the outer tube. The airflow of different temperatures blown out from each air cavity is directed towards the inner wall of the outer tube. The hollow water-cooled outer tube has two cavities inside, upper and lower. The upper cavity sprays low-pressure water flow directed towards the upper outer wall of the outer tube, and the lower cavity sprays high-pressure water flow directed towards the lower outer wall of the outer tube. The opening unit includes an opening base, on which three punches are connected at equal intervals. The negative pressure synchronization unit includes a hollow negative pressure plate, which is attached to the lower outer wall of the outer tube where the opening is located.

[0006] As a further embodiment of the present invention: a melt channel is connected between the discharge end of the extruder and the blow molding die; an annular melt flow channel and an extrusion flow channel are provided inside the blow molding die, and the annular melt flow channel is connected to the melt channel and the extrusion flow channel. The extrusion flow channel is used to extrude the molten material into an outer sleeve; a tape-passing channel is provided through the center of the blow molding die, and the drip irrigation tape passes through the tape-passing channel along the extrusion direction of the outer sleeve and extends into the interior of the outer sleeve.

[0007] As a further embodiment of the present invention: the kit production assembly also includes a sizing sleeve for sizing and shaping the extruded outer tube. The sizing sleeve is coaxially connected to the blow molding die head and is located between the blow molding die head and the hollow water-cooled outer tube. The inner diameter of the sizing sleeve matches the outer diameter of the outer tube.

[0008] As a further embodiment of the present invention: two symmetrically arranged partitions are connected inside the hollow cavity of the hollow water-cooled outer tube, and the hollow cavity of the hollow water-cooled outer tube is divided into an upper cavity and a lower cavity by the partitions. Two water inlet connectors are fixedly installed on the side wall of the hollow water-cooled outer tube, and the two water inlet connectors are respectively connected to the upper cavity and the lower cavity inside the hollow water-cooled outer tube; a base plate is provided below the extrusion path of the outer tube, and a water collection tank is fixedly connected to the base plate. The hollow water-cooled outer tube is supported and connected to the water collection tank directly above it by a connecting rod.

[0009] As a further embodiment of the present invention: a hollow exhaust ring is connected to the end of the air-cooled inner tube away from the blow molding head; an exhaust pipe and three air supply pipes are connected to the inner wall of the air-cooled inner tube; the end of the exhaust pipe away from the blow molding head is connected to the hollow exhaust ring; the ends of the three air supply pipes away from the blow molding head are respectively connected to the high-temperature air cavity, the normal-temperature air cavity, and the low-temperature air cavity; the other ends of the exhaust pipe and the three air supply pipes are all connected through a threaded channel, and the other end of the exhaust pipe is connected to an external exhaust device; the other ends of the three air supply pipes are respectively connected to gas conveying devices at different temperatures; multiple conveying guide rings are connected inside the air-cooled inner tube; the air-cooled inner tube, the conveying guide rings, and the hollow exhaust ring are arranged coaxially; several air outlets connected to each air cavity are opened on the outer side of the air-cooled inner tube; several exhaust holes connected to the exhaust cavity inside the ring are opened on the outer side of the hollow exhaust ring.

[0010] As a further embodiment of the present invention: a positioning collar is fitted on the outer tube between the hollow water-cooled outer tube and the opening unit. A collar bracket is fixedly connected between the positioning collar and the base plate. A flared-mouth scraper sleeve fitted on the outer tube is fixedly connected inside the positioning collar. The small end of the flared-mouth scraper sleeve faces the hollow water-cooled outer tube, and the large end of the flared-mouth scraper sleeve faces the opening unit.

[0011] As a further embodiment of the present invention: the hole-opening unit also includes a servo punch, a U-shaped frame, a clamping wheel, and a limiting seat; the servo punch is fixedly mounted on the base plate, the impact end of the servo punch is fixedly connected to the hole-opening base, the bottom end of the frame of the U-shaped frame is fixedly connected to the base plate, the clamping wheel is rotatably connected to the horizontal frame and the two vertical frames of the U-shaped frame respectively, and the clamping wheel is tightly attached to the top and the two sides of the outer tube respectively, the left and right sides of the hole-opening base are symmetrically fixed with limiting seats, the limiting seats are movably sleeved on the two vertical frames of the U-shaped frame, the upper end face of the hole-opening base connected to the punch is arc-shaped, the upper end face of the hole-opening base is in contact with the outer wall of the outer tube, and a gasket is also fixedly connected to the upper end face of the hole-opening base.

[0012] As a further embodiment of the present invention: the hollow negative pressure plate is supported and connected to the base plate by a connecting rod. The hollow negative pressure plate is a closed hollow cavity structure. The cavity of the hollow negative pressure plate is connected to an external negative pressure air source. The upper plate of the hollow negative pressure plate is an arc-shaped surface that fits against the outer wall of the outer sleeve. Sealing strips are fixedly connected to the four perimeter of the upper plate of the hollow negative pressure plate.

[0013] As a further embodiment of the present invention: the kit production assembly also includes two sets of conveying units disposed on the side of the hollow negative pressure plate away from the blow molding head, and a laser cutting device is disposed between the two sets of conveying units; the conveying unit includes conveying rollers, roller frames and drive motors, the roller frames are fixedly connected to the base plate, and two layers of roller groups are rotatably connected on the roller frames, the two layers of roller groups are respectively clamped on the upper and lower sides of the outer sleeve, the roller groups include several conveying rollers arranged side by side, one of the conveying rollers of the lower roller group is fixedly connected to the motor shaft of the drive motor on the same axis, and a transmission belt is connected between two adjacent conveying rollers of the lower roller group, and the body of the drive motor is fixedly connected to the roller frame.

[0014] As a further embodiment of the present invention: along the conveying direction of the outer sleeve, an electric winding turntable is provided on the side of the conveying unit away from the blow molding head, and the finished sleeve drip irrigation tape output by the conveying unit is wound on the electric winding turntable.

[0015] A method for manufacturing drip irrigation tape with a casing includes the following steps: S1. Plastic raw materials are added to the extruder, heated and plasticized, and then fed into the annular melt flow channel of the blow molding die through the melt pipe. The material is then extruded through the extrusion channel to form a molten outer tube. At the same time, the pre-made drip irrigation tape is inserted into the tape-passing channel in the center of the blow molding die, so that the drip irrigation tape is coaxially fitted inside the outer tube, and the feeding speed of the drip irrigation tape is synchronized with the extrusion speed of the outer tube. S2. The extruded outer tube, together with the inner drip irrigation tape, is pulled into the sizing sleeve. Through the constraint of the sizing sleeve on the inner cavity, the outer diameter of the outer tube is shaped to the preset size. S3. The shaped outer tube is sequentially cooled in sections by the cooling unit, passing the inner and outer walls of the tube in stages. The inner wall cooling method is as follows: high-temperature gas at 150 to 200°C is blown into the inner wall of the outer tube through the high-temperature air cavity inside the air-cooled inner tube to keep the inner wall of the outer tube in a plasticized state to eliminate internal stress; then, room-temperature gas at 20 to 30°C is blown into the room-temperature air cavity to initially cool the inner wall; finally, low-temperature gas at 5 to 15°C is blown into the low-temperature air cavity to quickly solidify the inner wall. The outer wall cooling method is as follows: low-pressure water is sprayed into the upper outer wall of the outer tube through the upper cavity of the hollow water-cooled outer tube, while high-pressure water is sprayed into the lower outer wall of the outer tube through the lower cavity of the hollow water-cooled outer tube. The pressure difference between the upper and lower water tubes is used to counteract the sagging deformation caused by the weight of the outer tube, keeping the outer tube in the center position of the hollow water-cooled outer tube throughout the cooling process. S4. Pass the cooled outer tube through the flared-mouth scraper sleeve fixed inside the positioning collar, and use the small-diameter end of the flared-mouth scraper sleeve to scrape off the residual cooling water on the outer wall of the outer tube; then transport the outer tube to the hole-making unit, and drive the hole-making base through the servo punch, so that the three punches on the hole-making base, which are equidistantly arranged, punch out three rows of water holes in sequence along the circumference of the outer tube. The angle between the line connecting the outer two holes and the center of the tube is 90 degrees, and the middle hole is in the middle position of the two outer holes; during the hole-making process, the clamping roller on the U-shaped frame is used to circumferentially position the outer tube to prevent the outer tube from rotating or shifting during hole making. S5. The perforated outer tube is transported to the negative pressure synchronization unit, so that the upper plate of the hollow negative pressure plate is attached to the lower outer wall of the tube body at the perforation of the outer tube, and a sealed contact is formed through the sealing strip; the external negative pressure air source is activated to generate negative pressure in the cavity of the hollow negative pressure plate, and the air inside the outer tube is drawn out through the water outlet at the lower part of the outer tube, so that the drip irrigation tape inside is attracted by the negative pressure and sticks tightly to the lower side of the inner wall of the outer tube. Thus, when the outer tube is pulled forward, the drip irrigation tape moves synchronously with the outer tube by friction. S6. The composite sleeve consisting of the outer sleeve and the inner drip irrigation tape, which achieve synchronous traction, is conveyed to the conveying unit. It is clamped and pulled forward by the upper and lower conveying rollers and conveyed to the electric winding turntable. The electric winding turntable completes the automatic winding and ensures that the water outlet hole on the outer sleeve always faces the outside of the turntable after winding, so that the water outlet hole can be attached to the ground during subsequent laying. According to the preset cutting length, the laser cutting device then uses a fixed-length laser cutting method to complete the fixed-length cutting during the continuous winding process of the composite sleeve.

[0016] The beneficial effects of this invention are: 1. This invention sets up an extruder and a set of production components connected to the discharge end of the extruder, and sets up a blow molding die in the set of production components. The material extruded by the extruder is extruded and plasticized into an outer tube through the blow molding die, while the drip irrigation tape moves through the blow molding die and is fitted inside the outer tube. This realizes the one-time completion of the extrusion forming of the outer tube and the insertion of the drip irrigation tape, completely avoiding the cumbersome process of producing the outer tube first and then inserting the tube in the traditional process, thus improving production efficiency. 2. The kit production assembly of the present invention is provided with a cooling unit, a hole-opening unit and a negative pressure synchronization unit in sequence along the extrusion and plasticizing direction of the outer tube, so that all processes from melt extrusion, cooling and shaping, online hole opening to synchronous traction of the inner tube can be completed automatically on the same production line, avoiding the twisting, jamming or scratching problems that may occur during secondary tube threading. 3. The cooling unit of this invention includes an air-cooled inner tube located inside the outer tube and a hollow water-cooled outer tube located outside the outer tube. The air-cooled inner tube has a high-temperature air cavity, a normal-temperature air cavity, and a low-temperature air cavity opened sequentially. Each air cavity blows airflow of different temperatures towards the inner wall of the outer tube to achieve segmented temperature-changing cooling. First, the high-temperature gas delays the solidification of the inner wall to maintain plasticity. Then, the normal-temperature gas gradually cools the inner wall to avoid thermal shock. Finally, the low-temperature gas rapidly solidifies the inner wall, matching the cooling rate of the outer wall. The hollow water-cooled outer tube has two cavities, upper and lower. The upper cavity sprays low-pressure water towards the upper outer wall of the outer tube, and the lower cavity sprays high-pressure water towards the lower outer wall of the outer tube. The upward lifting force generated by the water pressure difference counteracts the sagging deformation caused by the weight of the outer tube, so that the outer tube is always suspended in the center of the hollow water-cooled outer tube during the cooling process, ensuring uniform wall thickness and roundness of the tube. 4. The negative pressure synchronization unit set in this invention includes a hollow negative pressure plate. The hollow negative pressure plate is attached to the lower outer wall of the outer tube where the hole is opened. Since the water outlet of the outer tube is located in the lower tube, the hollow negative pressure plate directly covers the hole area. When the negative pressure is activated, the air inside the outer tube is drawn out through the water outlet to form a negative pressure zone inside the outer tube, thereby adsorbing the soft drip irrigation tape and sticking it tightly to the lower side of the inner wall of the outer tube, realizing the synchronous traction of the drip irrigation tape and the outer tube. There is no need to set a separate driving device for the drip irrigation tape, avoiding the problems of stretching, twisting or piling of the drip irrigation tape due to asynchronous speed. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the blow molding die head, sizing sleeve, hollow water-cooled outer pipe and hollow negative pressure plate of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the blow molding die head of the present invention; Figure 4 This is a schematic cross-sectional view of the hollow water-cooled outer tube, the air-cooled inner tube, and the outer sleeve of the present invention. Figure 5 This is a schematic diagram of the longitudinal cross-sectional structure of the hollow water-cooled outer tube of the present invention; Figure 6 This is a schematic diagram of the cross-sectional structure of the positioning collar and the flared nozzle scraper sleeve of the present invention; Figure 7 This is a schematic diagram of the opening unit structure of the present invention; Figure 8 This is a schematic diagram of the cross-sectional structure of the perforated base and gasket of the present invention; Figure 9 This is a schematic diagram of the longitudinal cross-sectional structure of the hollow negative pressure plate of the present invention; Figure 10 This is a schematic diagram of the connection structure between the conveying unit and the outer sleeve of the present invention; Figure 11This is a schematic diagram of the conveying unit structure of the present invention.

[0018] In the diagram: 1. Extruder; 11. Melt pipe; 2. Assembly production components; 21. Blow molding die; 22. Sizing sleeve; 23. Hollow water-cooled outer pipe; 24. Perforated base; 25. Hollow negative pressure plate; 26. Conveyor roller; 27. Positioning collar; 28. Annular melt flow channel; 29. ​​Extrusion flow channel; 210. Threading channel; 211. Air-cooled inner pipe; 212. High-temperature air chamber; 213. Normal-temperature air chamber; 214. Low-temperature air chamber; 215. Hollow exhaust ring; 216. Air supply pipe; 217. Exhaust fan. 218. Pipeline; 219. Conveyor ring; 220. Partition plate; 221. U-shaped frame; 222. Clamping wheel; 222. Limit seat; 223. Servo punch; 224. Punch; 225. Gasket; 226. Roller frame; 227. Drive motor; 228. Transmission belt; 229. Trumpet-shaped scraper sleeve; 230. Collar bracket; 231. Water inlet connector; 232. Sealing strip; 3. Base plate; 31. Water collection trough; 4. Drip irrigation tape; 5. Outer sleeve; 6. Electric winding turntable; 7. Laser cutting device. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 like Figures 1 to 11As shown, a drip irrigation tape production device includes an extruder 1 and a production assembly 2 connected to the discharge end of the extruder 1. The production assembly 2 includes a blow molding die 21. The material extruded by the extruder 1 is extruded and plasticized into an outer tube 5 through the blow molding die 21. A drip irrigation tape 4 is sleeved inside the outer tube 5, and the drip irrigation tape 4 movably passes through the blow molding die 21. The production assembly 2 is sequentially equipped with a cooling unit, an opening unit, and a negative pressure synchronization unit along the extrusion and plasticization direction of the outer tube 5, realizing the one-time completion of the extrusion forming of the outer tube 5 and the insertion of the drip irrigation tape 4, avoiding the cumbersome process of producing the outer tube first and then inserting it twice in the traditional process, improving production efficiency and reducing labor costs. Based on this, a cooling unit, an opening unit, and a negative pressure synchronization unit are sequentially arranged along the extrusion and plasticizing direction of the outer tube 5. This allows all processes from melt extrusion, cooling and shaping, online opening to synchronous traction of the inner tube to be completed automatically on the same production line, avoiding the twisting, jamming, or scratching problems that may occur during secondary tube threading. The cooling unit provides a dimensionally stable tube for subsequent opening, the opening unit provides the water outlet required for adsorption for the negative pressure synchronization unit, and the negative pressure synchronization unit, in turn, ensures that the inner tube will not slide relative to the outer tube during the opening process, forming a closed-loop production process. It should be noted that the extruder 1 can be a single-screw extruder or a twin-screw extruder. The cooling unit includes an air-cooled inner tube 211 located inside the outer tube 5 and a hollow water-cooled outer tube 23 located outside the outer tube 5. The air-cooled inner tube 211 has a high-temperature air chamber 212, a normal-temperature air chamber 213, and a low-temperature air chamber 214 sequentially formed inside the tube along the extrusion and plasticizing direction of the outer tube 5. Airflows of different temperatures from each air chamber are directed towards the inner wall of the outer tube 5. The hollow water-cooled outer tube 23 has two cavities, upper and lower. The upper cavity sprays low-pressure water towards the upper outer wall of the outer tube 5, while the lower cavity sprays high-pressure water towards the outer wall of the tube. The outer wall of the lower part of the outer tube 5 is cooled by high-temperature gas blown from the high-temperature air chamber 212, which slows down the rapid solidification of the inner wall, allowing the outer tube 5 to maintain sufficient plasticity when it leaves the blow molding die 21. This is beneficial for uniformly adhering to the mold during subsequent sizing and improving the accuracy of the outer diameter. Secondly, the room-temperature gas blown from the room-temperature air chamber 213 acts as a transitional cooling agent, preventing thermal shock caused by a sudden drop in temperature. Finally, the low-temperature gas blown from the low-temperature air chamber 214 causes the inner wall to solidify rapidly, thus matching the cooling rate of the outer wall. At the same time, the hollow water-cooled outer tube 23 forms a water-cooling system with a pressure difference between the upper and lower parts. This system not only cools the outer wall of the outer tube 5 but also uses the upward lifting force generated by the water pressure difference to counteract the sagging deformation caused by the weight of the outer tube 5. This ensures that the outer tube 5 remains suspended in the center of the hollow water-cooled outer tube 23 during the cooling process, thereby guaranteeing the uniformity and roundness of the tube wall thickness and avoiding problems such as wall thickness eccentricity and ellipticity deviation caused by gravity. The perforation unit includes a perforation base 24, on which three equally spaced punches 224 are connected. The negative pressure synchronization unit includes a hollow negative pressure plate 25, which is attached to the lower outer wall of the outer casing 5 where the perforation is located. The perforation unit allows three water outlets on different planes to be punched out on the outer casing 5 in a single operation. The equally spaced arrangement of the three punches 224 ensures consistent hole spacing. The hollow negative pressure plate 25 can be attached to the lower outer wall of the outer casing 5 where the perforation is located. Since the water outlet of the outer casing 5 is located in the lower part of the casing, the hollow negative pressure plate 25 directly covers the perforation area. When negative pressure is activated, water flows through the water outlet... By extracting air from the inside of the outer tube 5, a negative pressure zone is created inside the outer tube 5, which attracts the soft drip irrigation tape 4 and makes it adhere tightly to the lower inner wall of the outer tube 5. This achieves synchronous traction between the drip irrigation tape 4 and the outer tube 5, eliminating the need for a separate drive device for the drip irrigation tape 4 and avoiding problems such as stretching, twisting, or piling of the drip irrigation tape 4 due to asynchronous speeds. At the same time, since the adsorption force comes from the water outlet holes already opened in the outer tube 5, there is no need for additional holes or modifications to the pipe structure. In addition, the hollow negative pressure plate 25 attached to the lower outer wall of the pipe body can also play a certain auxiliary support role, preventing the outer tube 5 after the holes are opened from causing local depressions under the action of gravity, and ensuring the roundness of the pipe.

[0021] Example 2 Improvements based on Example 1: like Figure 1 and Figure 2 As shown, a melt channel 11 connects the discharge end of the extruder 1 to the blow molding die 21. An annular melt channel 28 and an extrusion channel 29 are provided inside the blow molding die 21, and the annular melt channel 28 connects the melt channel 11 and the extrusion channel 29. The extrusion channel 29 is used to extrude the molten material into an outer sleeve 5. A tape-passing channel 210 is provided through the center of the blow molding die 21. The drip tape 4 passes through the tape-passing channel 210 along the extrusion direction of the outer sleeve 5 and extends into the inner part of the outer sleeve 5. The melt channel 11 provides a stable way for the molten material to be transported from the extruder 1 to the blow molding die 21, ensuring the stability of the extrusion molding. The annular melt channel 28 inside the blow molding die 21 ensures that the molten material is evenly distributed inside the blow molding die 21 and extruded simultaneously from the circumference, thereby forming an outer sleeve 5 with a uniform wall thickness and avoiding local thin-wall or thick-wall defects caused by uneven material distribution. Meanwhile, the drip irrigation tape 4 passes through the tape-through channel 210 and extends into the interior of the outer tube 5 along the extrusion direction of the outer tube 5, ensuring that the drip irrigation tape 4 can be placed inside the outer tube 5 during the extrusion molding process. The relative positions of the two remain unchanged in subsequent cooling, opening, traction and other processes. In addition, the tape-through channel 210 is isolated from the annular melt flow channel 28, so that the high-temperature molten material will not come into contact with the drip irrigation tape 4, avoiding thermal damage to the drip irrigation tape 4 and ensuring the integrity of the labyrinth flow channel or patch structure of the drip irrigation tape 4.

[0022] like Figure 1 and Figure 3 As shown, the production assembly 2 also includes a sizing sleeve 22 for sizing and shaping the extruded outer tube 5. The sizing sleeve 22 is coaxially connected to the blow molding die 21 and is located between the blow molding die 21 and the hollow water-cooled outer tube 23. The inner diameter of the sizing sleeve 22 matches the outer diameter of the outer tube 5. The sizing sleeve 22 can forcibly constrain the outer diameter of the outer tube 5 after it has been extruded and before it has completely cooled. When the outer tube 5 is still in a semi-molten state after leaving the blow molding die 21, its outer diameter may change irregularly due to gravity, extrusion pressure fluctuations, or traction speed changes. By sliding contact between the inner wall of the sizing sleeve 22 and the outer surface of the tube, the outer diameter of the outer tube 5 can be brought to the design size, eliminating the dimensional deviation caused by extrusion expansion, so that the outer diameter tolerance of the final product can be controlled within a very small range.

[0023] like Figure 1 , Figure 4 and Figure 5 As shown, two symmetrically arranged baffles 219 are connected inside the hollow cavity of the hollow water-cooled outer tube 23, and the hollow cavity of the hollow water-cooled outer tube 23 is divided into an upper cavity and a lower cavity by the baffles 219. Two water inlet connectors 231 are fixedly installed on the side wall of the hollow water-cooled outer tube 23, and the two water inlet connectors 231 are respectively connected to the upper cavity and the lower cavity inside the hollow water-cooled outer tube 23. A base plate 3 is provided below the extrusion path of the outer tube 5, and a water collection tank 31 is fixedly connected to the base plate 3. The hollow water-cooled outer tube 23 is supported and connected to the water collection tank 31 directly above it by a connecting rod. The baffles 219 divide the hollow cavity into an upper cavity and a lower cavity, so that the pressure and cooling water of the upper and lower paths can be controlled separately. The two water inlets 231 are connected to the upper and lower cavities inside the hollow water-cooled outer tube 23, respectively, allowing the user to independently adjust the pressure of the upper and lower cooling water. For example, the water pressure in the lower cavity can be set higher than that in the upper cavity, thereby using the upward thrust generated by the water pressure difference to counteract the weight of the outer tube 5 and achieve hydraulic suspension and centering. At the same time, the cooling water sprayed from the upper and lower cavities can drip naturally or flow into the water collection tank 31 after cooling the outer tube 5, preventing the cooling water from splashing around in the working area. The water collection tank 31 can also be connected to a circulating filtration system to purify the collected cooling water for reuse, thereby saving water resources and reducing production costs.

[0024] Furthermore, the end of the air-cooled inner tube 211 furthest from the blow molding head 21 is connected to a hollow exhaust ring 215. The inner wall of the air-cooled inner tube 211 is connected to an exhaust pipe 217 and three air supply pipes 216. The end of the exhaust pipe 217 furthest from the blow molding head 21 is connected to the hollow exhaust ring 215. The ends of the three air supply pipes 216 furthest from the blow molding head 21 are respectively connected to a high-temperature air chamber 212, a normal-temperature air chamber 213, and a low-temperature air chamber 214. The other ends of the exhaust pipe 217 and the three air supply pipes 216 all pass through a threaded channel 210, and the other end of the exhaust pipe 217 is connected to an external exhaust device. The other ends of the three air supply pipes 216 are respectively connected to gas conveying devices at different temperatures. Multiple conveying guide rings 218 are connected inside the air-cooled inner tube 211. The air-cooled inner tube 211, the conveying guide rings 218, and the hollow exhaust ring 215 are arranged coaxially. The outer side of the inner cooling tube 211 has several air outlets connected to each air cavity. The outer side of the hollow exhaust ring 215 has several exhaust holes connected to the exhaust cavity inside the ring. The exhaust pipe 217 is used to remove the hot and humid air between the inner wall of the outer sleeve 5 and the air-cooled inner tube 211, preventing condensation from accumulating and causing water stains on the inner wall of the pipe. The three air supply pipes 216 enable independent delivery and control of three different temperatures of gas. The wiring of the exhaust pipe 217 and the air supply pipe 216 ensures that the entire air path will not interfere with the passage of the drip irrigation belt 4. The delivery guide ring 218 provides support and guidance for the drip irrigation belt 4. The air outlets on the outer side of the air-cooled inner tube 211 ensure that the airflow is evenly sprayed onto the inner circumference of the outer sleeve 5. The exhaust holes on the outer side of the hollow exhaust ring 215 can draw in the hot and humid air inside the outer sleeve 5.

[0025] like Figure 1 , Figure 2 and Figure 6 As shown, a positioning collar 27 is fitted onto the outer tube 5 between the hollow water-cooled outer tube 23 and the perforation unit. A collar bracket 230 is fixedly connected between the positioning collar 27 and the base plate 3. A flared-mouth scraper sleeve 229 fitted onto the outer tube 5 is fixedly connected inside the positioning collar 27, with the smaller end of the flared-mouth scraper sleeve 229 facing the hollow water-cooled outer tube 23 and the larger end facing the perforation unit. When the outer tube 5 passes through the hollow water-cooled outer tube 23... At that time, a large amount of cooling water may remain on its outer wall. If these water droplets adhere to the pipe wall and enter the opening unit, it may cause the punch 224 to slip, the hole position to shift, or the punching burrs to increase. The small end of the flared mouth scraper sleeve 229 is in close contact with the outer wall of the outer sleeve 5. The relative movement between the pipe and the scraper sleeve when the pipe is advancing will scrape off the water droplets on the outer wall. At the same time, the flared mouth scraper sleeve 229 can be made of flexible materials such as rubber or silicone, which will not scratch the surface of the outer sleeve 5 and ensure the appearance quality of the pipe.

[0026] like Figure 1 , Figure 2 , Figure 7 and Figure 8 As shown, the punching unit also includes a servo punch 223, a U-shaped frame 220, clamping wheels 221, and limiting seats 222. The servo punch 223 is fixedly mounted on the base plate 3, and the impact end of the servo punch 223 is fixedly connected to the punching base 24. The bottom end of the frame of the U-shaped frame 220 is fixedly connected to the base plate 3. The clamping wheels 221 are rotatably connected to the horizontal frame and the two vertical frames of the U-shaped frame 220, and the clamping wheels 221 are respectively tightly attached to the top and both sides of the outer sleeve 5. Limiting seats 222 are symmetrically fixed on the left and right sides of the punching base 24. The limiting seats 222 are movably sleeved on the two vertical frames of the U-shaped frame 220. The upper end face of the punch 224 connected to the punch 224 is... The upper surface of the arc-shaped perforated base 24 is in contact with the outer wall of the outer sleeve 5, and a gasket 225 is fixedly connected to the upper surface of the perforated base 24. The clamping wheel 221 forms a three-way clamping structure on the outer wall of the outer sleeve 5, which can position the outer sleeve 5 from the top and the left and right sides to prevent the outer sleeve 5 from jumping up and down and swinging left and right during the punching process. The limiting seat 222 and the U-shaped frame 220 form a sliding guide structure, so that the perforated base 24 can only move up and down in the vertical direction, avoiding the problem of misalignment between the punch 224 and the tube wall due to horizontal offset. The gasket 225 plays a role in buffering and protection, preventing the metal perforated base 24 from directly contacting the tube surface of the outer sleeve 5 and causing scratches.

[0027] like Figure 1 , Figure 2 and Figure 9As shown, the hollow negative pressure plate 25 is supported and connected to the base plate 3 by a connecting rod. The hollow negative pressure plate 25 is a closed hollow cavity structure, and the cavity of the hollow negative pressure plate 25 is connected to an external negative pressure air source. The upper plate of the hollow negative pressure plate 25 is arc-shaped and fits against the outer wall of the outer sleeve 5. Sealing strips 232 are fixedly connected to the four edges of the upper plate of the hollow negative pressure plate 25. The arc-shaped shape of the upper plate of the hollow negative pressure plate 25 fits against the outer wall of the outer sleeve 5, so that the hollow negative pressure plate 25 can tightly wrap around the lower part of the outer sleeve 5, covering the area of ​​the opening position to the maximum extent, thereby reducing air leakage loss. The sealing strip 232 forms an elastic seal between the negative pressure plate and the outer sleeve 5. When the negative pressure is activated, the sealing strip 232 is pressed against the outer wall of the outer sleeve 5, effectively preventing external air from entering from the edge of the negative pressure plate and ensuring the vacuum level inside the cavity. It should be noted that the sealing strip 232 can be made of wear-resistant and aging-resistant rubber material, which can meet the needs of long-term continuous production. The negative pressure generated by the hollow negative pressure plate 25 adsorbs the drip irrigation tape 4, which has the advantages of non-contact, no damage to the drip irrigation tape 4, and automatic adaptation to speed changes. Moreover, the magnitude of the negative pressure adsorption force can be controlled by adjusting the pressure of the negative pressure air source. Therefore, it can be applied to drip irrigation tapes 4 with different wall thicknesses and materials. At the same time, the operation of this negative pressure synchronization unit relies entirely on the existing water outlet on the outer sleeve 5, without the need to add any additional structure or opening to the outer sleeve 5, thus maintaining the integrity and strength of the pipe.

[0028] like Figure 1 , Figure 10 and Figure 11 As shown, the production assembly 2 also includes two sets of conveying units disposed on the side of the hollow negative pressure plate 25 away from the blow molding head 21, with a laser cutting device 7 disposed between the two sets of conveying units; the conveying unit includes conveying rollers 26, roller frames 226, and drive motors 227. The roller frames 226 are fixedly connected to the base plate 3, and two layers of roller groups are rotatably connected to the roller frames 226. The two layers of roller groups are respectively clamped on the upper and lower sides of the outer sleeve 5. The roller group includes several conveying rollers 26 arranged side by side. One of the conveying rollers 26 in the lower roller group is fixedly connected to the motor shaft of the drive motor 227 on the same axis, and the lower roller group... A transmission belt 228 is connected between two adjacent conveyor rollers 26 of the wheel set, and the body of the drive motor 227 is fixedly connected to the roller frame 226. The conveyor rollers 26 clamp the outer sleeve 5 from the top and bottom, which can provide uniform traction force. A transmission belt 228 is connected between two adjacent conveyor rollers 26 of the lower roller set to realize the synchronous drive of multiple conveyor rollers 26, ensuring the uniformity and consistency of traction speed. A laser cutting device 7 is set between the two sets of conveying units, which can ensure that after cutting, the two sets of conveying units can continue to pull the two broken sections of the outer sleeve 5 respectively, which is convenient for subsequent winding operations. Furthermore, along the conveying direction of the outer sleeve 5, an electric winding turntable 6 is provided on the side of the conveying unit away from the blow molding head 21. The finished drip irrigation tape output by the conveying unit is wound on the electric winding turntable 6, completing the entire production process from raw materials to finished products. It should be noted that the laser cutting device 7 is an existing online laser flying saw, such as the Shenyang Kangte CTLC series CNC online laser cutting flying saw or similar equipment, used to realize the online fixed-length cutting of the drip irrigation tape 4 and the outer sleeve 5 that are sleeved together. The electric winding turntable 6 can adopt an automatic plastic pipe winding device disclosed in announcement number CN211593198U.

[0029] Example 3 A method for manufacturing drip irrigation tape with a casing includes the following steps: S1. Plastic raw material is added to extruder 1, heated and plasticized, and then fed into the annular melt flow channel 28 of blow molding die 21 through melt pipe 11. It is then extruded through extrusion channel 29 to form a molten outer tube 5. At the same time, a pre-made drip irrigation tape 4 is inserted into the tape threading channel 210 in the center of blow molding die 21, so that the drip irrigation tape 4 is coaxially fitted inside the outer tube 5, and the feeding speed of the drip irrigation tape 4 is synchronized with the extrusion speed of the outer tube 5. S2. The extruded outer tube 5, together with the inner drip irrigation tape 4, is pulled into the sizing sleeve 22. Through the constraint of the sizing sleeve 22 on the inner cavity, the outer diameter of the outer tube 5 is shaped to the preset size. S3. The shaped outer sleeve 5 is sequentially cooled in sections by the cooling unit for both the inner and outer walls. The inner wall cooling method is as follows: high-temperature gas at 150 to 200°C is blown into the inner wall of the outer tube 5 through the high-temperature air cavity 212 in the air-cooled inner tube 211 to keep the inner wall of the outer tube 5 in a plasticized state to eliminate internal stress; then, room-temperature gas at 20 to 30°C is blown into the room-temperature air cavity 213 to initially cool the inner wall; finally, low-temperature gas at 5 to 15°C is blown into the low-temperature air cavity 214 to quickly solidify the inner wall. The outer wall cooling method is as follows: low-pressure water is sprayed into the upper outer wall of the outer tube 5 through the upper cavity of the hollow water-cooled outer tube 23, and high-pressure water is sprayed into the lower outer wall of the outer tube 5 through the lower cavity of the hollow water-cooled outer tube 23. The pressure difference between the upper and lower water tubes is used to counteract the sagging deformation caused by the weight of the outer tube 5, keeping the outer tube 5 in the center position of the hollow water-cooled outer tube 23 throughout the cooling process. S4. Pass the cooled outer tube 5 through the flared-mouth scraper sleeve 229 fixed inside the positioning collar 27, and use the small-diameter end of the flared-mouth scraper sleeve 229 to scrape off the residual cooling water on the outer wall of the outer tube 5; then transport the outer tube 5 to the hole-opening unit, and drive the hole-opening base 24 through the servo punch 223, so that the three punches 224 arranged at equal intervals on the hole-opening base 24 punch out three rows of water holes in sequence along the circumference of the outer tube 5. The angle between the line connecting the outer two holes and the center of the tube is 90 degrees, and the middle hole is in the middle position of the two outer holes; during the hole-opening process, the clamping roller 221 on the U-shaped frame 220 is used to circumferentially position the outer tube 5 to prevent the outer tube 5 from rotating or shifting during the hole-opening process; S5. The perforated outer tube 5 is transported to the negative pressure synchronization unit, so that the upper plate surface of the hollow negative pressure plate 25 is attached to the lower outer wall of the tube body of the outer tube 5 at the perforation, and a sealed contact is formed through the sealing strip 232; the external negative pressure air source is activated to generate negative pressure in the cavity of the hollow negative pressure plate 25, and the air inside the outer tube 5 is drawn out through the water outlet at the lower part of the outer tube 5, so that the drip irrigation tape 4 inside is attracted by the negative pressure and sticks tightly to the lower side of the inner wall of the outer tube 5, so that when the outer tube 5 is pulled forward, the drip irrigation tape 4 moves synchronously with the outer tube 5 by friction. S6. The composite sleeve consisting of the outer sleeve 5 and the inner drip irrigation tape 4, which achieve synchronous traction, is transported to the conveying unit. It is clamped and pulled forward by the upper and lower conveying rollers 26 and transported to the electric winding turntable 6. The electric winding turntable 6 completes the automatic winding and ensures that the water outlet hole on the outer sleeve 5 always faces the outside of the turntable after winding, so that the water outlet hole can be attached to the ground during subsequent laying. According to the preset cutting length, the laser cutting device 7 then uses the fixed-length laser cutting method to complete the fixed-length cutting during the continuous winding process of the composite sleeve.

[0030] Working principle: When the extruder 1 is started, the plastic raw material is fed into the annular melt flow channel 28 of the blow molding die 21 through the melt pipe 11, and is extruded from the extrusion channel 29 to form a molten outer tube 5; at the same time, the drip irrigation tape 4 is inserted from the tape-passing channel 210 in the center of the blow molding die 21 and coaxially sleeved inside the outer tube 5; after the outer tube 5 enters the sizing sleeve 22 for shaping, it enters the cooling unit: the high temperature air cavity 212, the normal temperature air cavity 213, and the low temperature air cavity 214 of the air-cooled inner tube 211 sequentially blow gases of different temperatures onto the inner wall of the outer tube 5 to achieve segmented slow cooling of the inner wall; at the same time, low-pressure water is sprayed into the upper cavity of the hollow water-cooled outer tube 23 and high-pressure water is sprayed into the lower cavity, using the water pressure difference to suspend the outer tube 5 in the center. To prevent sagging due to gravity, the cooled outer tube 5 is scraped by the flared water scraper 229 to remove residual water from the outer wall and enters the opening unit: the servo punch 223 drives the three punches 224 on the opening base 24 to punch out three rows of drainage holes under the positioning of the clamping wheel 221; then the outer tube 5 enters the negative pressure synchronization unit: the hollow negative pressure plate 25 is attached to the outer wall of the lower hole, sealed by the sealing strip 232 and vacuumed, so that the drip irrigation tape 4 is adsorbed on the inner wall of the outer tube 5, realizing the synchronous movement of the inner and outer tubes. Finally, the drip irrigation tape 4 and the outer tube 5, which are connected together, are pulled by the conveying roller 26 of the conveying unit and wound by the electric winding turntable 6. After being wound to a certain length, they are cut to a fixed length by the laser cutting device 7.

[0031] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A drip irrigation tape production device, comprising an extruder (1) and a set production assembly (2) connected to the discharge end of the extruder (1), characterized in that: The assembly production unit (2) includes a blow molding die (21). The material extruded by the extruder (1) is extruded and plasticized into an outer tube (5) through the blow molding die (21). A drip irrigation tape (4) is sleeved inside the outer tube (5), and the drip irrigation tape (4) moves through the blow molding die (21). The assembly production unit (2) is provided with a cooling unit, an opening unit and a negative pressure synchronization unit in sequence along the extrusion and plasticization direction of the outer tube (5). The cooling unit includes an air-cooled inner tube (211) located inside the outer tube (5) and a hollow water-cooled outer tube (23) located outside the outer tube (5). The air-cooled inner tube (211) has a high-temperature air cavity (212), a normal-temperature air cavity (213) and a low-temperature air cavity (214) sequentially opened along the extrusion and plasticizing direction of the outer tube (5). The airflow of different temperatures blown out by each air cavity is directed towards the inner wall of the outer tube (5). The hollow water-cooled outer tube (23) has two cavities, upper and lower. The upper cavity sprays out low-pressure water flow directed towards the upper outer wall of the outer tube (5), and the lower cavity sprays out high-pressure water flow directed towards the lower outer wall of the outer tube (5). The opening unit includes an opening base (24), on which three punches (224) are connected at equal intervals. The negative pressure synchronization unit includes a hollow negative pressure plate (25), which is attached to the lower outer wall of the outer tube (5) where the opening is located.

2. The drip irrigation tape production device according to claim 1, characterized in that: The discharge end of the extruder (1) is connected to the blow molding die (21) by a melt pipe (11); the blow molding die (21) is provided with an annular melt flow channel (28) and an extrusion flow channel (29), and the annular melt flow channel (28) is connected to the melt pipe (11) and the extrusion flow channel (29). The extrusion flow channel (29) is used to extrude the molten material into an outer tube (5); a tape-passing channel (210) is provided through the center of the blow molding die (21), and the drip irrigation tape (4) passes through the tape-passing channel (210) along the extrusion direction of the outer tube (5) and extends into the inner part of the outer tube (5).

3. The drip irrigation tape production device according to claim 1, characterized in that: The assembly production component (2) also includes a sizing sleeve (22) for sizing and shaping the extruded outer tube (5). The sizing sleeve (22) is coaxially connected to the blow molding die (21) and is located between the blow molding die (21) and the hollow water-cooled outer tube (23). The inner diameter of the sizing sleeve (22) matches the outer diameter of the outer tube (5).

4. The drip irrigation tape production device according to claim 1, characterized in that: The hollow water-cooled outer tube (23) has two symmetrically arranged partitions (219) connected inside its hollow cavity. The hollow cavity of the hollow water-cooled outer tube (23) is divided into an upper cavity and a lower cavity by the partitions (219). Two water inlet connectors (231) are fixedly installed on the side wall of the hollow water-cooled outer tube (23), and the two water inlet connectors (231) are respectively connected to the upper cavity and the lower cavity inside the hollow water-cooled outer tube (23). A base plate (3) is provided below the extrusion path of the outer sleeve (5). A water collection tank (31) is fixedly connected to the base plate (3). The hollow water-cooled outer tube (23) is supported and connected to the water collection tank (31) directly above it by a connecting rod.

5. The drip irrigation tape production device according to claim 2, characterized in that: The air-cooled inner tube (211) is connected to a hollow exhaust ring (215) at one end away from the blow molding head (21). An exhaust pipe (217) and three air supply pipes (216) are connected to the inner wall of the air-cooled inner tube (211). The exhaust pipe (217) at one end away from the blow molding head (21) is connected to the hollow exhaust ring (215). The three air supply pipes (216) at one end away from the blow molding head (21) are respectively connected to a high-temperature air chamber (212), a normal-temperature air chamber (213), and a low-temperature air chamber (214). The other ends of the exhaust pipe (217) and the three air supply pipes (216) are... The through-passage channel (210) is connected to the external exhaust equipment at the other end of the exhaust pipe (217); the other ends of the three air supply pipes (216) are respectively connected to gas supply equipment at different temperatures; the air-cooled inner tube (211) is connected to multiple conveying guide rings (218); the air-cooled inner tube (211), the conveying guide rings (218) and the hollow exhaust ring (215) are arranged on the same axis; the outer side of the air-cooled inner tube (211) is provided with several air outlets that are connected to each air cavity; the outer side of the hollow exhaust ring (215) is provided with several exhaust holes that are connected to the exhaust cavity inside the ring.

6. The drip irrigation tape production device according to claim 4, characterized in that: The outer tube (5) is fitted with a positioning collar (27) on the tube body between the hollow water-cooled outer tube (23) and the opening unit. The positioning collar (27) is fixedly connected to the base plate (3) with a collar bracket (230). The positioning collar (27) is fixedly connected with a flared mouth scraper sleeve (229) fitted on the tube body of the outer tube (5). The small end of the flared mouth scraper sleeve (229) faces the hollow water-cooled outer tube (23), and the large end of the flared mouth scraper sleeve (229) faces the opening unit.

7. The drip irrigation tape production device according to claim 4, characterized in that: The opening unit also includes a servo punch (223), a U-shaped frame (220), clamping wheels (221), and a limiting seat (222); the servo punch (223) is fixedly installed on the base plate (3), the impact end of the servo punch (223) is fixedly connected to the opening base (24), the bottom end of the frame of the U-shaped frame (220) is fixedly connected to the base plate (3), and the clamping wheels (221) are rotatably connected to the horizontal frame and the two vertical frames of the U-shaped frame (220), respectively. The clamping rollers (221) are respectively attached to the top and sides of the outer tube (5). The opening base (24) is symmetrically fixed with limit seats (222) on the left and right sides. The limit seats (222) are movably sleeved on the vertical frame on both sides of the U-shaped frame (220). The upper end face of the opening base (24) connected to the punch (224) is arc-shaped. The upper end face of the opening base (24) is in contact with the outer wall of the outer tube (5). The upper end face of the opening base (24) is also fixedly connected with a gasket (225).

8. The drip irrigation tape production device according to claim 4, characterized in that: The hollow negative pressure plate (25) is supported and connected to the base plate (3) by a connecting rod. The hollow negative pressure plate (25) is a closed hollow cavity structure. The cavity of the hollow negative pressure plate (25) is connected to an external negative pressure air source. The upper plate of the hollow negative pressure plate (25) is an arc-shaped surface that fits against the outer wall of the outer sleeve (5). Sealing strips (232) are fixedly connected to the four periphery of the upper plate of the hollow negative pressure plate (25).

9. The drip irrigation tape production device according to claim 4, characterized in that: The assembly production component (2) also includes two sets of conveying units located on the side of the hollow negative pressure plate (25) away from the blow molding head (21), and a laser cutting device (7) is provided between the two sets of conveying units; the conveying unit includes conveying rollers (26), roller frame (226) and drive motor (227), the roller frame (226) is fixedly connected to the base plate (3), and two layers of roller groups are rotatably connected on the roller frame (226), the two layers of roller groups are respectively clamped on the upper and lower sides of the outer sleeve (5), the roller group includes several conveying rollers (26) arranged side by side, one of the conveying rollers (26) of the lower roller group is fixedly connected to the motor shaft of the drive motor (227) on the same axis, and a transmission belt (228) is connected between two adjacent conveying rollers (26) of the lower roller group, and the body of the drive motor (227) is fixedly connected to the roller frame (226); Along the conveying direction of the outer sleeve (5), an electric winding turntable (6) is provided on the side of the conveying unit away from the blow molding head (21), and the finished sleeve drip irrigation tape output by the conveying unit is wound on the electric winding turntable (6).

10. A method for manufacturing drip irrigation tape with a casing, using the drip irrigation tape production apparatus as described in any one of claims 1 to 9, characterized in that: Includes the following steps: S1. Plastic raw material is added to the extruder (1), heated and plasticized, and then fed into the annular melt flow channel (28) of the blow molding die (21) through the melt pipe (11), and then extruded through the extrusion channel (29) to form a molten outer tube (5); at the same time, the pre-made drip irrigation tape (4) is inserted from the tape-passing channel (210) in the center of the blow molding die (21), so that the drip irrigation tape (4) is coaxially fitted inside the outer tube (5), and the feeding speed of the drip irrigation tape (4) is synchronized with the extrusion speed of the outer tube (5); S2. The extruded outer tube (5) and the inner drip irrigation tape (4) are pulled together into the sizing sleeve (22). Through the constraint of the sizing sleeve (22) on the inner cavity, the outer diameter of the outer tube (5) is shaped to the preset size. S3. The shaped outer sleeve (5) is cooled in sections by passing it through the cooling unit in sequence, with the inner and outer walls cooled in sections. The inner wall cooling method is as follows: high-temperature gas of 150 to 200°C is blown into the inner wall of the outer tube (5) through the high-temperature air cavity (212) in the air-cooled inner tube (211) to keep the inner wall of the outer tube (5) in a plasticized state to eliminate internal stress; then, room-temperature gas of 20 to 30°C is blown into the room-temperature air cavity (213) to cool the inner wall initially; finally, low-temperature gas of 5 to 15°C is blown into the low-temperature air cavity (214) to solidify the inner wall quickly; the outer wall cooling method is as follows: low-pressure water is sprayed into the upper outer wall of the outer tube (5) through the upper cavity of the hollow water-cooled outer tube (23), and high-pressure water is sprayed into the lower outer wall of the outer tube (5) through the lower cavity of the hollow water-cooled outer tube (23) to counteract the sagging deformation caused by the weight of the outer tube (5) and keep the outer tube (5) in the center position of the hollow water-cooled outer tube (23) during the cooling process; S4. Pass the cooled outer tube (5) through the flared mouth scraper sleeve (229) fixed inside the positioning collar (27), and use the small diameter end of the flared mouth scraper sleeve (229) to scrape off the cooling water remaining on the outer wall of the outer tube (5); then transport the outer tube (5) to the hole-opening unit, and drive the hole-opening base (24) through the servo punch (223) so that the three punches (224) arranged at equal intervals on the hole-opening base (24) punch out three rows of water holes in sequence along the circumferential direction of the outer tube (5). The angle between the two outer holes and the line connecting the tube center is 90 degrees, and the middle hole is in the middle position of the two outer holes; during the hole-opening process, the clamping wheel (221) on the U-shaped frame (220) is used to circumferentially position the outer tube (5) to prevent the outer tube (5) from rotating or shifting during hole opening; S5. The perforated outer tube (5) is transported to the negative pressure synchronization unit, so that the upper plate surface of the hollow negative pressure plate (25) is attached to the lower outer wall of the tube body where the perforation is opened in the outer tube (5), and a sealed contact is formed through the sealing strip (232); the external negative pressure air source is activated to generate negative pressure in the cavity of the hollow negative pressure plate (25), and the air inside the outer tube (5) is drawn out through the water outlet at the lower part of the outer tube (5), so that the drip irrigation tape (4) inside is adsorbed by the negative pressure and sticks tightly to the lower side of the inner wall of the outer tube (5), so that when the outer tube (5) is pulled forward, the drip irrigation tape (4) moves synchronously with the outer tube (5) by friction. S6. The composite sleeve consisting of the outer sleeve (5) and the inner drip irrigation tape (4) that achieve synchronous traction is transported to the conveying unit. It is clamped and pulled forward by the upper and lower conveying rollers (26) and transported to the electric winding turntable (6). The electric winding turntable (6) completes the automatic winding and ensures that the water outlet on the outer sleeve (5) always faces the outside of the turntable after winding, so that the water outlet can adhere to the ground during subsequent laying. According to the preset cutting length, the laser cutting device (7) then adopts the fixed-length laser cutting method to complete the fixed-length cutting during the continuous winding process of the composite sleeve.

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