A method and equipment for compression molding of plastic collection tubes

Abstract

This invention relates to the field of plastic molding technology, and discloses a method and equipment for compression molding of plastic collection tubes. The method includes steps such as equipment reset, module preheating, melting and plasticizing, melt cutting, mold cavity shifting, compression molding, cooling and shaping, and mold opening and demolding. The plastic collection tube compression molding equipment includes a feeding device, a mold cavity assembly, a mold core assembly, and a drive mechanism. The discharge end of the feeding device is equipped with a cutting device, and both the cutting device and the feeding device have heaters on their outer walls. A material receiving station is located directly below the discharge port of the cutting device, and a molding station is located on one side of the material receiving station. The drive mechanism drives the mold cavity assembly to move between the material receiving station and the molding station. The mold core assembly is positioned directly above the molding station via a circulating force field device. This invention can ensure the temperature uniformity of the cut melt blank and the internal uniformity of the produced slender collection tube, reduce tube defects, and enhance tube performance.

Description

Technical Field

[0001] This invention relates to the field of plastic molding technology, and in particular to a method and equipment for compression molding of plastic collection tubes. Background Technology

[0002] Plastic collection tubes, as plastic products with special structures and functions, have wide applications in fields such as biology, medicine, and chemical engineering. However, due to their special shape and size requirements, the molding and processing of plastic collection tubes has always been a technical challenge in the industry.

[0003] Traditional plastic collection tube molding methods include extrusion molding and injection molding. While these methods can produce tubes with a certain length-to-diameter ratio, they all have shortcomings when manufacturing slender collection tubes. Extrusion molding tubes are prone to defects such as voids and air bubbles inside the tube, leading to unstable tube performance, and also require a subsequent sealing process; while injection molding is limited by the size and shape of the mold, making it difficult to manufacture long and thin collection tubes. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention provides a method and equipment for compression molding of plastic collection tubes, which can not only produce slender plastic collection tubes, but also ensure the uniformity of the tube body, reduce tube defects, and enhance the performance of the tube body.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] A method for compression molding of a plastic collection tube includes the following steps:

[0007] Equipment reset: Before the equipment starts operating normally, first reset each module to standby mode;

[0008] Module preheating: Preheat the feeding device, cutting device and molding cavity assembly to the preset temperature and keep it at that temperature for a certain period of time;

[0009] Melting and plasticizing: Start the feeding device to melt and plasticize the plastic granules and transport them into the melt flow channel of the cutting device;

[0010] Melt cutting: Control the rotation of the cutter of the cutting device to cut the melt material in one go, and the cut melt billet falls into the bottom of the mold cavity of the mold cavity assembly;

[0011] Cavity relocation: Activate the moving cylinder to move the cavity assembly to the molding station;

[0012] Compression molding: The core assembly is rapidly pressed into the mold cavity assembly under the drive of the circulating force field device, compressing the molten blank at the bottom of the mold cavity and controlling the movement of the core;

[0013] Within a single compression cycle T, t1 is the compression process where the mold core and the molten blank are in contact, and t2 is the separation process where the mold core and the molten blank are not in contact. This cycle repeats, causing the mold core and the molten blank to be in compression and separation.

[0014] Cooling and shaping: The mold cavity assembly and the mold core assembly are in the closed state and held, and a low temperature liquid is introduced to cool them rapidly, so as to achieve cooling and shaping and finally form a plastic collection tube;

[0015] Mold opening and demolding: After sufficient cooling, remove the mold core assembly and take out the cooled and formed plastic collection tube. Finally, demold to separate the formed plastic collection tube from the mold core.

[0016] A plastic collection tube compression molding device includes a feeding device, a mold cavity assembly, a mold core assembly, and a driving mechanism. The feeding device has a cutting device at its discharge end, and both the cutting device and the outer wall of the feeding device are equipped with heaters. A material picking station is located directly below the discharge port of the cutting device, and a molding station is located on one side of the material picking station. The driving mechanism is used to drive the mold cavity assembly to move between the material picking station and the molding station. The mold core assembly is positioned directly above the molding station via a circulating force field device.

[0017] Preferably, the mold cavity assembly includes a mold cavity body and an outer sleeve fitted on the outer wall of the mold cavity body. The mold cavity body has a mold cavity extending to its upper end face inside. The bottom of the mold cavity body is provided with an exhaust ejector pin communicating with the mold cavity. The outer wall of the mold cavity body is provided with a liquid flow channel. The outer sleeve is provided with an inlet and an outlet communicating with the liquid flow channel.

[0018] Preferably, the mold core assembly includes a mold core and a mold core seat arranged coaxially. The upper end of the mold core seat is connected to the circulating force field device. The mold core includes a forming part and an anti-overflow part. The outer diameter of the anti-overflow part is the same as the diameter of the mold cavity. When the mold core and the mold cavity are closed, the anti-overflow part fits against the side wall of the mold cavity, and a tube forming cavity is formed between the forming part and the side wall of the mold cavity.

[0019] Preferably, the liquid flow channel includes a plurality of flow channel units evenly distributed along the height direction of the mold cavity, the plurality of flow channel units are connected to each other, the liquid inlet is connected to the flow channel unit located at the lowermost end, and the liquid outlet is connected to the flow channel unit located at the uppermost end.

[0020] Preferably, the feeding device includes a material cylinder, the inside of which is provided with a feeding chamber communicating with the discharge port, the inside of which is provided with a screw, one end of which is connected to a motor, the outer wall of which is provided with a heater and a hopper, and the hopper is connected to the feeding chamber.

[0021] Preferably, the cutting device includes a transfer block connected to the feeding device, the outer wall of the transfer block is provided with the heater, the interior of the transfer block is provided with a first melt flow channel communicating with the feeding chamber, and the lower end of the first melt flow channel is the discharge port;

[0022] The adapter block is also equipped with a rotary cutter, which has a second melt flow channel. A rotating shaft is connected to the rotary cutter, and the other end of the rotating shaft is used to connect to a power component. The power component is used to drive the rotary cutter to rotate, thereby realizing the connection and disconnection between the first melt flow channel and the second melt flow channel.

[0023] Preferably, the rotating shaft is provided with a sensing block, and further includes a sensor for detecting the sensing block, the sensor being electrically connected to the power assembly.

[0024] Preferably, the driving mechanism includes a slide rail and a moving cylinder. A moving seat is provided on the slide rail, and the mold cavity assembly is disposed on the moving seat. The moving cylinder is connected to the moving seat and is used to drive the moving seat to move the mold cavity assembly between the material picking station and the molding station.

[0025] Preferably, the circulating force field device includes a lead screw nut and a lead screw threadedly connected to the lead screw nut, the upper end of the lead screw being connected to a motor, and the lower end of the lead screw being connected to the mold core assembly.

[0026] The method and equipment for compression molding of a plastic collection tube according to an embodiment of the present invention have the following advantages compared with the prior art: By setting a feeding device, the raw materials can be precisely controlled; by setting a cutting device, the blank can be precisely controlled; and heaters are provided on the outer walls of both the cutting device and the feeding device to ensure the uniformity of the temperature of the cut melt blank, thus providing a precise and uniformly heated melt blank for compression molding. Furthermore, the core assembly and cavity assembly are driven to close and compress through a circulating force field device. The circulating force field device provides periodic cyclic stress to the core assembly during compression molding. This cyclic stress acts on the melt blank, strengthening the melt and effectively ensuring the uniformity of the inside of the produced slender collection tube, reducing tube defects, and simultaneously enhancing the tube's performance. Attached Figure Description

[0027] Figure 1 This is a flowchart of the plastic collection tube compression molding method of the present invention.

[0028] Figure 2 This is a schematic diagram of the plastic collection tube compression molding device of the present invention.

[0029] Figure 3 This is a schematic diagram showing the connection between the mold cavity assembly and the mold core assembly of the present invention.

[0030] Figure 4 for Figure 3 A partial view of A in the middle.

[0031] Figure 5 This is a schematic diagram of the material cutting device of the present invention in the material feeding state.

[0032] Figure 6 This is a schematic diagram of the cutting device of the present invention in the cutting state.

[0033] Figure 7 This is a force curve diagram of the core assembly during the compression molding process of the present invention.

[0034] Wherein: 1-Feeding device, 11-Barrel, 12-Screw, 13-Hopper, 14-Motor, 2-Mold cavity assembly, 21-Mold cavity body, 211-Liquid flow channel, 2111-Flow channel unit, 22-Outer jacket, 221-Inlet, 222-Outlet, 23-Exhaust ejector pin, 3-Mold core assembly, 31-Forming part, 32-Overflow prevention part, 33-Mold core seat, 4-Drive mechanism, 41-Slide rail, 42-Moving cylinder, 43-Moving seat, 5-Cutting device, 51-Transfer block, 52-First melt flow channel, 53-Rotating cutter, 54-Second melt flow channel, 55-Induction block, 56-Sensor, 57-Gear, 58-Wear-resistant sleeve, 6-Heater, 7-Circulating force field device, 71-Screw nut, 72-Screw, 73-Motor, 8-Pipe body, 9-Continuous extrusion melt, a-Cut melt. Detailed Implementation

[0035] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Furthermore, it should be understood in the description of this application that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] like Figure 1 As shown, to solve the above-mentioned technical problems, the present invention provides a method for compression molding of a plastic collection tube, comprising the following steps:

[0039] Equipment reset: Before the normal operation of the equipment, first reset each module. The rotating cutter 53 of the cutting device 5 is in the material feeding state, the mold cavity assembly 2 is placed in the material picking position, and the mold core assembly 3 is in the highest position of the circulating force field device 7.

[0040] Module preheating: The feeding device 1, the cutting device 5 and the mold cavity assembly 2 are fully preheated, and the temperature is maintained for a certain period of time after the preheating temperature is reached;

[0041] Melting and plasticizing: Start the motor 14 of the feeding device 1 and add plastic granules into the hopper 13. The plastic granules are melted and plasticized by the screw 12 and the barrel 11 and transported to the second melt flow channel 54 of the cutting device 5.

[0042] Melt cutting: Control the rotation of the rotary cutter 53 of the cutting device 5 to disconnect the rotary cutter 53 from the melt channel of the transfer block 51, realize the one-time cutting of the melt material, and the cut melt billet falls into the bottom of the mold cavity of the mold cavity assembly 3;

[0043] Cavity relocation: Activate the moving cylinder 42 to move the cavity assembly 2 to the molding station;

[0044] Compression molding: Under the drive of the circulating force field device 7, the mold core assembly 3 is rapidly pressed into the mold cavity assembly 2, compressing the molten blank at the bottom of the mold cavity and controlling the movement of the mold core;

[0045] Within a single compression cycle T, t1 is the compression process where the mold core and the molten blank are in contact, and t2 is the separation process where the mold core and the molten blank are not in contact. This cycle repeats, causing the mold core and the molten blank to be in compression and separation.

[0046] Cooling and shaping: The mold cavity assembly 2 and the mold core assembly 3 are in the closed state and maintained. The high temperature liquid in the mold cavity assembly 2 is switched to a low temperature liquid to cool it down quickly, achieve cooling and shaping, and finally form a plastic collection tube.

[0047] Mold opening and demolding: After sufficient cooling, remove the mold core assembly 3 and take out the cooled and formed plastic collection tube. Finally, demold to separate the formed plastic collection tube from the mold core.

[0048] like Figure 2 As shown, a preferred embodiment of the plastic collection tube compression molding equipment of the present invention includes a feeding device 1, a mold cavity assembly 2, a mold core assembly 3, and a driving mechanism 4. The feeding device 1 has a cutting device 5 at its discharge end, and both the cutting device 5 and the outer wall of the feeding device 1 are equipped with heaters 6. A material picking station is located directly below the discharge port of the cutting device 5, and a molding station is located on one side of the material picking station. The driving mechanism 4 is used to drive the mold cavity assembly 2 to move between the material picking station and the molding station. Preferably, the driving mechanism 4 includes a slide rail 41 and a moving cylinder 42. A moving seat 43 is provided on the slide rail 41, and the mold cavity assembly 2 is disposed on the moving seat 43. The moving cylinder 42 is connected to the moving seat 43 and is used to drive the moving seat 43 to move the mold cavity assembly 2 between the material picking station and the molding station. The sliding cooperation between the slide rail 41 and the moving seat 43 ensures the movement accuracy of the mold cavity assembly 2. The core assembly 3 is positioned directly above the forming station via a circulating force field device 7. The cavity assembly 2 picks up material at the material picking station and then closes the mold with the core assembly at the forming station to compress the tube 8.

[0049] Based on the above-mentioned technical features, the plastic collection tube compression molding equipment can achieve precise control of raw materials by setting a feeding device 1 and precise control of the blank by setting a cutting device 5. At the same time, heaters 6 are provided on the outer walls of both the cutting device 5 and the feeding device 1 to ensure the temperature uniformity of the cut melt blank, thus providing a precise and temperature-uniform melt blank for compression molding. In addition, the core assembly 3 and the cavity assembly 2 are driven to close the mold for compression molding by a circulating force field device 7. The circulating force field device 7 provides periodic cyclic stress to the core assembly 3 during compression molding. The cyclic stress acts on the melt blank to strengthen the melt, thereby effectively ensuring the uniformity of the inside of the produced slender plastic collection tube, reducing tube defects, and strengthening the tube performance.

[0050] like Figure 3As shown, in this embodiment, the mold cavity assembly 2 includes a mold cavity body 21 and an outer sleeve 22 fitted onto the outer wall of the mold cavity body 21. The mold cavity body 21 has a cavity extending to its upper end face inside. The bottom of the mold cavity body 21 has an venting ejector pin 23 communicating with the cavity. The outer wall of the mold cavity body 21 has a liquid flow channel 211. The outer sleeve 22 has an inlet 221 and an outlet 222 communicating with the liquid flow channel 211. Liquid flows into the liquid flow channel 211 from the inlet 221. Then it flows out from the outlet 222; the mold core assembly 3 includes a mold core and a mold core seat 33 arranged coaxially. The upper end of the mold core seat 33 is connected to the circulating force field device 7. The mold core includes a forming part 31 and an anti-overflow part 32. The outer diameter of the anti-overflow part 32 is the same as the diameter of the mold cavity. When the mold core and the mold cavity are closed, the anti-overflow part 32 fits against the side wall of the mold cavity. A tube forming cavity is formed between the forming part 31 and the side wall of the mold cavity. The tube 8 is compressed and formed in the tube forming cavity.

[0051] By setting the mold core as a forming part 31 and an anti-overflow part 32, and the outer diameter of the anti-overflow part 32 is the same as the diameter of the mold cavity, when the mold core and the mold cavity are closed, the anti-overflow part 32 fits against the side wall of the mold cavity to form a seal, and a tube forming cavity is formed between the forming part 31 and the side wall of the mold cavity. Thus, during the compression molding process of the tube body 8, there will be no overflow. The raw material is completely compressed and molded in the tube forming cavity, ensuring the accuracy and strength of the tube body 8 after compression molding.

[0052] Meanwhile, by setting a liquid flow channel 211 on the outer wall of the mold cavity 21 and setting an inlet 221 and an outlet 222 on the outer sleeve 22 that are connected to the liquid flow channel 211, high-temperature liquid is first delivered through the inlet 221 before the blank is added for molding, so as to fully preheat the mold. After preheating, the blank is sent into the mold cavity of the mold cavity assembly and the mold is closed and held in the state. Then, the high-temperature liquid in the mold core assembly and the mold cavity assembly is switched to low-temperature liquid, so as to quickly cool the mold core and the mold cavity 21. By switching between high-temperature liquid and low-temperature liquid, preheating and rapid cooling are achieved, which not only improves production efficiency, but also further improves product quality.

[0053] Please see the appendix Figure 2-4 In this embodiment, the liquid flow channel 211 includes a plurality of flow channel units 2111 evenly distributed along the height direction of the mold cavity 21. The plurality of flow channel units 2111 are interconnected. The liquid inlet 221 is connected to the flow channel unit 2111 located at the lowermost end, and the liquid outlet 222 is connected to the flow channel unit 2111 located at the uppermost end. The plurality of flow channel units 2111 can be arranged horizontally and connected through vertical channels; alternatively, the liquid flow channel 211 can be arranged in a spiral shape.

[0054] Since the mold cavity 21 is preheated and cooled through the liquid flow channel 211, ensuring uniform and rapid preheating and cooling while maintaining the strength of the mold cavity 21 itself is crucial. Extensive experimental verification has shown that if the depth of the flow channel unit 2111 is *a*, the height of the flow channel unit 2111 is *h*, and the distance between two adjacent flow channel units 2111 is *s*, then they satisfy the relationship: h = (1~1.2)a, such as h = 1.1a, h = 1.15a, etc. The specific value can be determined based on the wall thickness of the mold cavity 21. When the wall thickness is large, the depth of the flow channel unit 2111 can be larger; when the wall thickness is small, the depth of the flow channel unit 2111 can be smaller. Specifically, if the distance between the bottom wall of the flow channel unit 2111 and the inner wall of the mold cavity is *b*, it can be set with reference to b = 0.5a. The relationship between s and h satisfies s = (1.1 ~ 1.5)h, such as s = 1.2h, 1.3h, 1.4h, etc.

[0055] Furthermore, since the tube body 8 is compressed and formed within the tube body forming cavity, it is only necessary for the liquid flow channel 211 to achieve rapid preheating and cooling of the tube body forming cavity. Therefore, after the mold core and the mold cavity are closed, the liquid flow channel 211 corresponds to the forming part 31 and their heights are equivalent. Specifically, if the height of the liquid flow channel 211 is H, the length of the forming part 31 is L, and the height of the flow channel unit 21111 is h, then they satisfy the following relationship: H = (0.9~1.1)L, such as H = 0.95L, H = L. At the same time, the length of the forming part 31 and the height of the flow channel unit 2111 satisfy L = (10~15)h, such as L = 11h, L = 12h, L = 13h, L = 14h.

[0056] In summary, the depth a of the flow channel unit 2111, the height h of the flow channel unit 2111, the distance s between two adjacent flow channel units 2111, the height H of the liquid flow channel 211, and the length L of the molding part 31 are all interconnected and mutually influential. Only by simultaneously satisfying the above relationships can we ensure that the mold preheating and cooling are uniform and rapid, while also ensuring the strength of the mold cavity 21 itself, and ensuring the optimal height of the liquid flow channel 211, thus avoiding the waste of the liquid flow channel height 211.

[0057] During setup, since the length of the molding part 31 corresponds to the length of the tube body 8 to be produced, the value L can be determined first, and then the height H of the liquid flow channel 211 and the height h of the flow channel unit 2111 can be determined. The depth a of the flow channel unit 2111 can be determined by h. At the same time, the depth a of the flow channel unit 2111 determined above is verified according to the distance b between the bottom wall of the flow channel unit 2111 and the inner wall of the mold cavity, ensuring that its value conforms to all the above relationships. Finally, the distance s between two adjacent flow channel units 2111 is determined.

[0058] like Figure 2 As shown, in this embodiment, the feeding device 1 includes a barrel 11, the inside of which is provided with a feeding chamber communicating with the discharge port. A screw 12 is provided inside the feeding chamber, one end of which is connected to a motor 14 via a reducer. The outer wall of the barrel 11 is provided with a heater 6 and a hopper 13, the hopper 13 being connected to the feeding chamber. During feeding, the motor 14 is started and plastic granules are added to the hopper 13. The plastic granules are melted and plasticized by the screw 12 and the barrel 11 and transported to the melt flow channel of the cutting device 5.

[0059] like Figure 5-6 As shown, the cutting device 5 includes a transfer block 51 connected to the feeding device 1. The heater 6 is provided on the outer wall of the transfer block 51. The interior of the transfer block 51 is provided with a first melt flow channel 52 that communicates with the feeding chamber. The lower end of the first melt flow channel 52 is the discharge port.

[0060] The adapter block 51 also houses a rotary cutter 53, which has a second melt flow channel 54. A rotating shaft is connected to the rotary cutter 53, and the other end of the shaft is connected to a power component. The power component, such as a motor, drives the rotary cutter to rotate, enabling the connection and disconnection between the first melt flow channel 52 and the second melt flow channel 54. Additionally, the adapter block 51 also houses a pair of meshing gears 57 corresponding to the first melt flow channel 52. The meshing portion of the two gears 57 is located within the first melt flow channel 52, used to control the quantitative delivery of the high-temperature melt material within the first melt flow channel 52. The steering block 52 also houses a wear-resistant sleeve 58, which is fitted onto the rotating shaft to prevent direct friction between the rotating shaft and the steering block 51.

[0061] Before the rotary cutter 53 starts cutting, the heater 6 installed outside the adapter block 51 is energized and preheated. After reaching the set temperature, the molten plasticized high-temperature melt material is transported to the second melt flow channel 52. The high-temperature melt material is quantitatively transported by the meshing gears inside the adapter block. The melt material flows into the melt flow channel of the rotary cutter 53 and finally flows out through the melt flow channel inside the rotary cutter 53. That is, the second melt flow channel 52 is located at the lowest end of the first melt flow channel 51. When cutting and picking up material is not required, the melt flow channel of the rotary cutter 53 and the melt flow channel of the adapter block 51 are directly connected (e.g., Figure 5 The molten material can be directly discharged, forming a continuous extruded melt 9. When it is necessary to cut off the blank, the rotation of the rotary cutter 53 is controlled to disconnect the rotary cutter 53 from the melt channel of the transfer block (e.g., Figure 6 This process achieves a single cutting action of the molten material, forming cut melt a. After the rotating cutter's molten channel rotates 180°, it reconnects with the cutter holder's molten channel, allowing for continued molten material extrusion. The cutter then continues to rotate, and repeating the above actions enables intermittent cutting.

[0062] In this embodiment, to facilitate control of the rotation of the rotary cutter 53, a sensing block 55 is provided on the rotating shaft, and a sensor 56 for detecting the sensing block 55 is also included. The sensor 56 is electrically connected to the power assembly. Through the cooperation of the sensor 56 and the sensing block 55, the rotation angle of the rotating shaft is accurately determined, and the start and stop of the power assembly are controlled, thereby achieving precise control of the material.

[0063] Compared to existing cutting components where the temperature of the external cutting blade is inconsistent with the temperature of the internal flow channel of the melt, leading to uncontrollable temperature control after the melt comes into contact with the blade, the cutting device of this invention improves the temperature uniformity and weight consistency of the cut melt billet, thereby improving the quality of the melt billet. Simultaneously, it simplifies the cutting device, reduces the number of parts, ensures higher precision, and features a compact overall structure with a small footprint. The built-in rotating cutter enhances safety and reduces the probability of accidents.

[0064] like Figure 2 , 7As shown, the cyclic force field device 7 includes a lead screw nut 71 and a lead screw 72 threadedly connected to the lead screw nut 71. The lead screw nut 71 is fixedly installed, such as on a machine frame. The upper end of the lead screw 72 is connected to a motor 73, and the lower end of the lead screw 72 is connected to the mold core seat 33 of the mold core assembly 3 via a flange. Under the drive of the lead screw 72 and the motor 73, the mold core assembly 3 moves back and forth in the vertical direction, providing a cyclic stress with a period of T to the mold core assembly 3 during compression molding. Within one cyclic compression cycle T, t1 is the compression process where the mold core is in contact with the molten blank, and t2 is the separation process where the mold core is not in contact with the molten blank. This cycle repeats, causing the mold core and the molten blank to be in compression and separation.

[0065] The method of this invention for manufacturing plastic collection tubes not only produces slender collection tubes but also ensures the uniformity of the tube body 8, reduces tube defects, and enhances the performance of the tube body 8.

[0066] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A plastic collection tube compression molding device, characterized in that: The device includes a feeding device, a mold cavity assembly, a mold core assembly, and a driving mechanism. The feeding device has a cutting device at its discharge end, and both the cutting device and the outer wall of the feeding device are equipped with heaters. A material picking station is located directly below the discharge port of the cutting device, and a forming station is located on one side of the material picking station. The driving mechanism is used to drive the mold cavity assembly to move between the material picking station and the forming station. The mold core assembly is positioned directly above the forming station via a circulating force field device. The mold cavity assembly includes a mold cavity body, the interior of which is provided with a mold cavity extending to its upper end face. The mold core assembly includes a mold core and a mold core seat arranged coaxially. The upper end of the mold core seat is connected to the circulating force field device. The mold core includes a forming part and an anti-overflow part. The outer diameter of the anti-overflow part is the same as the diameter of the mold cavity. When the mold core and the mold cavity are closed, the anti-overflow part fits against the side wall of the mold cavity, and a tube forming cavity is formed between the forming part and the side wall of the mold cavity. The feeding device includes a material cylinder, the inside of which is provided with a feeding chamber connected to the discharge port. The cutting device includes a transfer block connected to the feeding device. The outer wall of the transfer block is provided with the heater. The inside of the transfer block is provided with a first melt flow channel connected to the feeding chamber. The lower end of the first melt flow channel is the discharge port. The adapter block is also equipped with a rotary cutter, which has a second melt flow channel. A rotating shaft is connected to the rotary cutter, and the other end of the rotating shaft is used to connect to a power component. The power component is used to drive the rotary cutter to rotate, thereby realizing the connection and disconnection between the first melt flow channel and the second melt flow channel.

2. The plastic collection tube compression molding equipment as described in claim 1, characterized in that: The mold cavity assembly includes an outer sleeve fitted on the outer wall of the mold cavity. The bottom of the mold cavity is provided with an exhaust ejector pin that communicates with the mold cavity. The outer wall of the mold cavity is provided with a liquid flow channel. The outer sleeve is provided with an inlet and an outlet that communicate with the liquid flow channel.

3. The plastic collection tube compression molding equipment as described in claim 2, characterized in that: The liquid flow channel includes multiple flow channel units evenly distributed along the height direction of the mold cavity. The multiple flow channel units are connected to each other. The liquid inlet is connected to the flow channel unit located at the lowest end, and the liquid outlet is connected to the flow channel unit located at the highest end.

4. The plastic collection tube compression molding equipment as described in any one of claims 1-3, characterized in that: The feed chamber is equipped with a screw, one end of which is connected to a motor. The outer wall of the cylinder is equipped with a heater and a hopper, and the hopper is connected to the feed chamber.

5. The plastic collection tube compression molding equipment as described in claim 1, characterized in that: The rotating shaft is equipped with a sensing block, and also includes a sensor for detecting the sensing block, the sensor being electrically connected to the power assembly.

6. The plastic collection tube compression molding equipment as described in any one of claims 1-3, characterized in that: The driving mechanism includes a slide rail and a moving cylinder. A moving seat is provided on the slide rail, and the mold cavity assembly is disposed on the moving seat. The moving cylinder is connected to the moving seat and is used to drive the moving seat to move the mold cavity assembly between the material picking station and the molding station.

7. The plastic collection tube compression molding equipment as described in any one of claims 1-3, characterized in that: The circulating force field device includes a lead screw nut and a lead screw threadedly connected to the lead screw nut. The upper end of the lead screw is connected to a motor, and the lower end of the lead screw is connected to the mold core assembly.

8. A method for compression molding of a plastic collection tube, using the plastic collection tube compression molding equipment as described in any one of claims 1-7, comprising the following steps: Equipment reset: Before the equipment starts operating normally, first reset each module to standby mode; Module preheating: The feeding device, the cutting device and the forming mold cavity assembly are preheated until the temperature reaches the preset temperature and is maintained for a certain period of time; Melting and plasticizing: Start the feeding device to melt and plasticize the plastic granules and transport them into the first melt flow channel of the cutting device; Melt cutting: Control the rotation of the rotary cutter of the cutting device to cut the melt material in one go, and the cut melt blank falls into the bottom of the mold cavity of the mold cavity assembly; Mold cavity relocation: Activate the drive mechanism to move the mold cavity assembly to the molding station; Compression molding: The mold core assembly is rapidly pressed down into the mold cavity assembly under the driving action of the circulating force field device, and the melt blank at the bottom of the mold cavity is compressed, and the movement of the mold core is controlled; In one cyclic compression cycle T, t1 is when the mold core is in contact with the molten blank and is in the compression process, and t2 is when the mold core is not in contact with the molten blank and is in the separation process. This cycle is repeated so that the mold core and the molten blank are in compression and separation. Cooling and shaping: The mold cavity assembly and the mold core assembly are in the closed state and held, and a low-temperature liquid is introduced to cool them rapidly, achieving cooling and shaping, and finally forming a plastic collection tube; Demolding: After sufficient cooling, remove the mold core assembly and bring out the cooled and formed plastic collection tube. Finally, demold to separate the formed plastic collection tube from the mold core.

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