A special mold for compression molding a collection tube

Abstract

The application relates to the technical field of plastic forming, and discloses a special mold for compression forming a collection tube, which comprises a mold cavity assembly and a mold core assembly; the mold cavity assembly comprises a mold cavity body and a sleeve arranged on the outer wall of the mold cavity body, the inside of the mold cavity body is provided with a mold cavity extending to the upper end face of the mold cavity body, the bottom of the mold cavity body is provided with an exhaust ejector communicating with the mold cavity, the outer wall of the mold cavity body is provided with a first liquid flow channel, the sleeve is provided with a first liquid inlet and a first liquid outlet communicating with the first liquid flow channel; the mold core assembly comprises an inner sleeve, a mold core and a mold core seat coaxially arranged, the upper end of the inner sleeve is clamped to the inside of the mold core seat, the mold core is sleeved to the outside of the inner sleeve, the upper end of the mold core is connected with the mold core seat, a second liquid flow channel is formed between the mold core and the inner sleeve, and the mold core seat is provided with a second liquid inlet and a second liquid outlet communicating with the second liquid flow channel. The application can improve the precision and strength of the compression-formed collection tube, guarantee the product quality and improve the production efficiency.

Description

Technical Field

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

[0002] Plastic collection tubes are widely used in various fields such as food, medical, and chemical industries due to their lightweight, corrosion resistance, and brittleness. However, the compression molding technology for thin-walled plastic collection tubes has always been a technical challenge in the industry.

[0003] Currently, compression molding dies on the market are mainly divided into two types: overflow compression dies and non-overflow compression dies. Although overflow compression dies have a simple structure and low cost, raw materials are prone to overflow during the compression process, resulting in horizontal flash on the finished product, which is difficult to remove, and is also prone to defects such as low product density, insufficient strength, and poor appearance. While non-overflow compression dies can better control raw material overflow, the mold structure is complex, the technology is difficult, and the production efficiency is low, making it difficult to promote and apply on a large scale. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a specialized mold for compression molding of collection tubes, which improves the precision and strength of compression-molded thin-walled plastic collection tube products, ensures product quality, increases production efficiency, and reduces the difficulty and cost of mold production and processing.

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

[0006] A special mold for compression molding of a collection tube, comprising a mold cavity assembly and a mold core assembly;

[0007] 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 has an exhaust ejector pin connected to the mold cavity. The outer wall of the mold cavity body has a first liquid flow channel. The outer sleeve has a first liquid inlet and a first liquid outlet connected to the first liquid flow channel.

[0008] The mold core assembly includes an inner sleeve and a mold core and a mold core seat arranged coaxially. The upper end of the inner sleeve is snapped into the inside of the mold core seat, the mold core is sleeved on the outside of the inner sleeve, and the upper end of the mold core is connected to the mold core seat. A second liquid flow channel is formed between the mold core and the inner sleeve. The mold core seat is provided with a second liquid inlet and a second liquid outlet that are connected to the second liquid flow channel.

[0009] The mold core includes a mold core body, which 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.

[0010] Preferably, the first 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 first liquid inlet is connected to the flow channel unit located at the lowermost end, and the first liquid outlet is connected to the flow channel unit located at the uppermost end.

[0011] Preferably, the depth of the flow channel unit is 'a', the height of the flow channel unit is 'h', and the distance between two adjacent flow channel units is 's', then they satisfy the following relationship:

[0012] h=(1~1.2)a; s=(1.1~1.5)h.

[0013] Preferably, after the mold core and the mold cavity are closed, the first liquid flow channel corresponds to the molding part;

[0014] The height of the first liquid flow channel is H, the length of the molding part is L, and the height of the flow channel unit is h. Then, the following relationship is satisfied between them:

[0015] H=(0.9~1.1)L, L=(10~15)h.

[0016] Preferably, the mold core base has a first snap-fit ​​groove and a second snap-fit ​​groove arranged coaxially inside, and the second snap-fit ​​groove extends to the end face of the mold core base. The diameter of the first snap-fit ​​groove is smaller than that of the second snap-fit ​​groove. The mold core is connected to the second snap-fit ​​groove, and the upper end of the inner sleeve passes through the second snap-fit ​​groove and snaps into the first snap-fit ​​groove.

[0017] Preferably, the upper end of the mold core is provided with a retaining seat, and a base plate is provided between the retaining seat and the mold core. The retaining seat is engaged with the second retaining groove, and the mold core base abuts against the base plate.

[0018] Preferably, the card holder has an inlet hole communicating with the first snap-fit ​​groove inside. The inner sleeve includes an inner sleeve body inserted into the mold core and a first snap-fit ​​part disposed on the upper end of the inner sleeve body. A second snap-fit ​​part is provided between the first snap-fit ​​part and the inner sleeve body. The first snap-fit ​​part snaps into the first snap-fit ​​groove. A first cavity is formed between the second snap-fit ​​part and the inner wall of the first snap-fit ​​groove. The first cavity is communicating with the second inlet. A second cavity is formed between the second snap-fit ​​part and the inner wall of the inlet hole. The first cavity and the second liquid flow channel are both communicating with the second cavity.

[0019] Preferably, the liquid inlet hole is a stepped hole, comprising a first hole body and a second hole body, wherein the first hole body is located above the second hole body and has a diameter larger than the second hole body;

[0020] The second cavity includes a cavity unit one and a cavity unit two that are connected to each other. The cavity unit one is connected to the first cavity, and the cavity unit two is connected to the second liquid flow channel.

[0021] A guide portion is provided on one side of the lower end of the second snap-fit ​​portion. The upper end of the second snap-fit ​​portion forms a cavity unit between itself and the inner wall of the first hole. The guide portion and the second cavity form a cavity unit. The lower end of the second snap-fit ​​portion, opposite to the guide portion, is in contact with the inner wall of the second hole.

[0022] Preferably, the mold core has a mold core flow channel extending to its upper end face inside, and the mold core flow channel is connected to the second liquid inlet;

[0023] The inner sleeve is provided with an inner sleeve flow channel extending to both ends of the inner sleeve, and the two ends of the inner sleeve flow channel are respectively connected to the mold core flow channel and the second liquid outlet.

[0024] Preferably, the second liquid outlet is located above the second liquid inlet, and the mold core seat is further provided with a connecting channel, the two ends of which are respectively connected to the second liquid outlet and the inner sleeve flow channel.

[0025] The present invention discloses a special mold for compression molding of a collection tube. Compared with the prior art, its advantages are as follows: by setting the mold core body as a molding part and an anti-overflow part, and 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 molding part and the side wall of the mold cavity. Thus, during the tube compression molding process, 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 after compression molding. Meanwhile, by setting a first liquid flow channel on the outer wall of the mold cavity, and setting a first liquid inlet and a first liquid outlet connected to the first liquid flow channel on the outer sleeve; and setting a second liquid flow channel between the mold core and the inner sleeve, and setting a second liquid inlet and a second liquid outlet connected to the second liquid flow channel on the mold core seat, high-temperature liquid is first supplied through the first and second liquid inlets 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 a closed 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 rapidly cool the mold core and the mold cavity. By switching between high-temperature liquid and low-temperature liquid to achieve preheating and rapid cooling, not only is the production efficiency improved, but the product quality is further improved. In addition, the present invention has a simple structure, which reduces the production and processing difficulty and manufacturing cost of the mold. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the special mold for compression molding collection tube of the present invention.

[0027] Figure 2 for Figure 1 A partial view of A in the middle.

[0028] Figure 3 This is a schematic diagram of the core assembly of the present invention.

[0029] Figure 4 for Figure 3 A partial view.

[0030] Figure 5 This is a schematic diagram of the structure of the compression molding collection tube special mold of the present invention, showing the removal of the inner sleeve.

[0031] Figure 6 This is a schematic diagram of the inner sleeve of the present invention.

[0032] Figure 7 for Figure 3 A cross-sectional view of BB.

[0033] Wherein: 1-Mold cavity, 11-First liquid flow channel, 111-Flow channel unit, 2-Outer jacket, 21-First liquid inlet, 22-First liquid outlet, 3-Exhaust ejector pin, 4-Inner sleeve, 41-Inner sleeve body, 42-First snap-fit ​​part, 43-Second snap-fit ​​part, 44-Flow guide part, 5-Mold core, 51-Forming part, 52-Anti-overflow part, 53-Snap-fit ​​seat, 531-First hole, 532-Second hole, 54-Seat plate, 6-Mold core seat, 61-Second liquid inlet, 62-Second liquid outlet, 7-Second liquid flow channel, 71-First cavity, 72-Cavity unit one, 73-Cavity unit two, 74-Mold core flow channel, 75-Inner sleeve flow channel, 76-Connecting channel, 8-Pipe body. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] 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.

[0037] like Figure 1 As shown, a preferred embodiment of the present invention provides a special mold for compression molding of a collection tube, comprising a mold cavity assembly and a mold core assembly;

[0038] The mold cavity assembly includes a mold cavity body 1 and an outer sleeve 2 fitted on the outer wall of the mold cavity body 1. The mold cavity body 1 has a mold cavity extending to its upper end face inside. The bottom of the mold cavity body 1 is provided with an exhaust ejector pin 3 connected to the mold cavity. The outer wall of the mold cavity body 1 is provided with a first liquid flow channel 11. The outer sleeve 2 is provided with a first liquid inlet 21 and a first liquid outlet 22 connected to the first liquid flow channel 11. Liquid flows into the first liquid flow channel 11 from the first liquid inlet 21 and then flows out from the first liquid outlet 22.

[0039] The mold core assembly includes an inner sleeve 4 and a mold core 5 and a mold core seat 6 arranged coaxially. The upper end of the inner sleeve 4 is snapped into the inside of the mold core seat 6. The mold core 5 is sleeved on the outside of the inner sleeve 4, and the upper end of the mold core 5 is connected to the mold core seat 6. A second liquid flow channel 7 is formed between the mold core 5 and the inner sleeve 4. The mold core seat 6 is provided with a second liquid inlet 61 and a second liquid outlet 62 that are connected to the second liquid flow channel 7.

[0040] The mold core 5 includes a mold core body, which includes a molding part 51 and an anti-overflow part 52. The outer diameter of the anti-overflow part 52 is the same as the diameter of the mold cavity. When the mold core 5 and the mold cavity are closed, the anti-overflow part 52 fits against the side wall of the mold cavity. A tube forming cavity is formed between the molding part 51 and the side wall of the mold cavity. The tube 8 is compressed and formed in the tube forming cavity.

[0041] Based on the above-mentioned technical features, a special mold for compression molding of a collection tube is provided. By setting the mold core body as a molding part 51 and an anti-overflow part 52, and the outer diameter of the anti-overflow part 52 is the same as the diameter of the mold cavity, when the mold core 5 is closed with the mold cavity, the anti-overflow part 52 fits against the side wall of the mold cavity to form a seal, and a tube forming cavity is formed between the molding part 51 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.

[0042] Meanwhile, by setting a first liquid flow channel 11 on the outer wall of the mold cavity 1, and setting a first liquid inlet 21 and a first liquid outlet 22 connected to the first liquid flow channel 11 on the outer sleeve 2; setting a second liquid flow channel 7 between the mold core 5 and the inner sleeve 4, and setting a second liquid inlet 61 and a second liquid outlet 62 connected to the second liquid flow channel 7 on the mold core seat 6, high-temperature liquid is first supplied through the first liquid inlet 21 and the second liquid inlet 61 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 a closed 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 5 and the mold cavity 1. By switching between high-temperature liquid and low-temperature liquid to achieve preheating and rapid cooling, not only is the production efficiency improved, but the product quality is further improved. In addition, the plastic collection tube compression molding mold of the present invention has a simple structure, thereby reducing the production and processing difficulty and manufacturing cost of the mold.

[0043] Please see the appendix Figure 1 , 2 In this embodiment, the first liquid flow channel 11 includes a plurality of flow channel units 111 evenly distributed along the height direction of the mold cavity 1. The plurality of flow channel units 111 are interconnected. The first liquid inlet 21 is connected to the flow channel unit 111 located at the lowermost end, and the first liquid outlet 22 is connected to the flow channel unit 111 located at the uppermost end. The plurality of flow channel units 111 can be arranged horizontally and connected through vertical channels; alternatively, the first liquid flow channel 11 can be arranged in a spiral shape.

[0044] Since the mold cavity 1 is preheated and cooled through the first liquid flow channel 11, ensuring uniform and rapid preheating and cooling, while simultaneously maintaining the strength of the mold cavity 1 itself, is crucial. Extensive experimental verification has shown that if the depth of the flow channel unit 111 is *a*, the height of the flow channel unit 111 is *h*, and the distance between two adjacent flow channel units 111 is *s*, then they satisfy the relationship: h = (1~1.2)a, such as h = 1.1a, h = 1.15a, etc. Specifically, this can be determined based on the wall thickness of the mold cavity 1. When the wall thickness is large, the depth of the flow channel unit 111 can be larger; when the wall thickness is small, the depth of the flow channel unit 111 can be smaller. Specifically, if the distance between the bottom wall of the flow channel unit 111 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.

[0045] Furthermore, since the tube body 8 is compressed and formed within the tube body forming cavity, it is sufficient that the first liquid flow channel 11 can achieve rapid preheating and cooling of the tube body forming cavity. Therefore, when the mold core 5 is closed with the mold cavity, the first liquid flow channel 11 corresponds to the forming part 51 and their heights are equivalent. Specifically, if the height of the first liquid flow channel 11 is H, the length of the forming part 51 is L, and the height of the flow channel unit 1111 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 51 and the height of the flow channel unit 111 satisfy L = (10~15)h, such as L = 11h, L = 12h, L = 13h, L = 14h.

[0046] In summary, the depth a of the flow channel unit 111, the height h of the flow channel unit 111, the distance s between two adjacent flow channel units 111, the height H of the first liquid flow channel 11, and the length L of the molding part 51 are all interconnected and mutually influential. Only by simultaneously satisfying the above relationships can we ensure both uniform and rapid preheating and cooling of the mold, as well as the strength of the mold cavity 1 itself, and also ensure the optimal height of the first liquid flow channel 11, thus avoiding the waste of the height 11 of the first liquid flow channel.

[0047] During setup, since the length of the molding part 51 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 first liquid flow channel 11 and the height h of the flow channel unit 111 can be determined. The depth a of the flow channel unit 111 can be determined by h. At the same time, the depth a of the flow channel unit 111 determined above is verified according to the distance b between the bottom wall of the flow channel unit 111 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 111 is determined.

[0048] Please see the appendix Figure 3-5 In this embodiment, the mold core seat 6 has a first snap-fit ​​groove and a second snap-fit ​​groove arranged coaxially inside, and the second snap-fit ​​groove extends to the end face of the mold core seat 6. The first snap-fit ​​groove is located above the second snap-fit ​​groove, and the diameter of the first snap-fit ​​groove is smaller than that of the second snap-fit ​​groove. The mold core 5 is connected to the second snap-fit ​​groove, and the upper end of the inner sleeve 4 passes through the second snap-fit ​​groove and snaps into the first snap-fit ​​groove. Specifically, the upper end of the mold core 5 is provided with a retainer 53, and a seat plate 54 is provided between the retainer 53 and the mold core 5. The retainer 53 snaps into the second snap-fit ​​groove, and the mold core seat 6 abuts against the seat plate 54, thereby realizing a stable connection between the mold core seat 6, the mold core 5, and the inner sleeve 4.

[0049] Please see the appendix Figure 3-7In this embodiment, the mold core 5 has a mold core flow channel 74 extending to its upper end face inside, and the mold core flow channel 74 is connected to the second liquid inlet 61.

[0050] The inner sleeve 4 is provided with inner sleeve flow channels 75 extending to both ends of the inner sleeve 4. The two ends of the inner sleeve flow channels 75 are respectively connected to the mold core flow channel 74 and the second liquid outlet 62. Specifically, the second liquid outlet 62 is located above the second liquid inlet 61. The mold core seat 6 is also provided with a connecting channel 76 inside the mold core seat 6. The two ends of the connecting channel 76 are respectively connected to the second liquid outlet 62 and the inner sleeve flow channels 75.

[0051] Specifically, the card holder 53 has an inlet hole that communicates with the first card slot. The inner sleeve 4 includes an inner sleeve body 41 inserted into the mold core 5 and a first card slot 42 disposed on the upper end of the inner sleeve body 41. A second card slot 43 is provided between the first card slot 42 and the inner sleeve body 41. The first card slot 42 is engaged with the first card slot. A first cavity 71 is formed between the second card slot 42 and the inner wall of the first card slot. The first cavity 71 is connected to the second inlet 21. A second cavity is formed between the second card slot 43 and the inner wall of the inlet hole. The first cavity 71 and the mold core flow channel 74 are both connected to the second cavity.

[0052] Meanwhile, the liquid inlet hole is a stepped hole, including a first hole body 531 and a second hole body 532. The first hole body 531 is located above the second hole body 532 and its diameter is larger than that of the second hole body 532.

[0053] The second cavity includes a cavity unit 72 and a cavity unit 73 that are connected to each other. The cavity unit 72 is connected to the first cavity 71, and the cavity unit 73 is connected to the mold core flow channel 74.

[0054] A flow guide is provided on one side of the lower end of the second snap-fit ​​part. The upper end of the second snap-fit ​​part forms a cavity unit one with the inner wall of the first hole. The flow guide and the second cavity form a cavity unit two. The lower end of the second snap-fit ​​part is in contact with the inner wall of the second hole on the side opposite to the flow guide, which ensures the connection stability between the inner sleeve and the mold core.

[0055] In summary, the upper end of the mold core flow channel 74 is connected to the second liquid inlet 61 through the first cavity 71, cavity unit 72 and cavity unit 73, the lower end of the mold core flow channel 74 is connected to the lower end of the inner sleeve flow channel 75, and the upper end of the inner sleeve flow channel 75 is connected to the second liquid outlet 62 through the connecting channel 76.

[0056] Therefore, for the mold core assembly, the liquid flows from the second inlet 61 into the first cavity 71, then into the first cavity unit 72 and the second cavity unit 73, then into the mold core flow channel 74, then from the bottom of the mold core flow channel 74 into the inner sleeve flow channel 75, and finally into the second liquid outlet 62 through the connecting channel 76. Thus, the first cavity 71, the first cavity unit 72, the second cavity unit 73, the mold core flow channel 74, the inner sleeve flow channel 75, and the connecting channel 76 together constitute the second liquid flow channel 7.

[0057] Of course, this application may also use only the mold core flow channel 74 and the inner sleeve flow channel 75 as the second liquid flow channel 7.

[0058] Before adding the blank to the plastic collection tube compression molding die of the present invention, the die needs to be fully preheated. Specifically, high-temperature liquid at a set temperature is introduced into the inlet of the die core assembly and the die cavity assembly respectively and kept at the temperature for a certain period of time. After the temperature of the die core assembly and the die cavity assembly reaches the preset temperature, the blank is sent into the die cavity of the die cavity assembly. At the same time, the die core assembly is quickly pressed down into the die cavity to form the shape of the plastic collection tube and keep it in the closed state. Then, the high-temperature liquid in the die core assembly and the die cavity assembly is switched to low-temperature liquid to quickly cool the die core and the die cavity, so as to cool and solidify the plastic collection tube body 8 formed in the die cavity. After sufficient cooling, the die core is removed and the formed plastic collection tube body 8 is taken out. Finally, the formed plastic collection tube body 8 is demolded and separated.

[0059] 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 special mold for compression molding of a collection tube, characterized in that: Includes mold cavity assembly and mold core assembly; 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 has an exhaust ejector pin connected to the mold cavity. The outer wall of the mold cavity body has a first liquid flow channel. The outer sleeve has a first liquid inlet and a first liquid outlet connected to the first liquid flow channel. The mold core assembly includes an inner sleeve and a mold core and a mold core seat arranged coaxially. The upper end of the inner sleeve is snapped into the inside of the mold core seat, the mold core is sleeved on the outside of the inner sleeve, and the upper end of the mold core is connected to the mold core seat. A second liquid flow channel is formed between the mold core and the inner sleeve. The mold core seat is provided with a second liquid inlet and a second liquid outlet that are connected to the second liquid flow channel. The mold core includes a mold core body, which 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.

2. The special mold for compression molding of a collection tube as described in claim 1, characterized in that: The first 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 first liquid inlet is connected to the flow channel unit located at the lowest end, and the first liquid outlet is connected to the flow channel unit located at the highest end.

3. The special mold for compression molding of a collection tube as described in claim 2, characterized in that: The depth of the flow channel unit is a, the height of the flow channel unit is h, and the distance between two adjacent flow channel units is s. Then, the following relationship is satisfied: h=(1~1.2)a; s=(1.1~1.5)h.

4. The special mold for compression molding of a collection tube as described in claim 2, characterized in that: When the mold core and the mold cavity are closed, the first liquid flow channel corresponds to the molding part; The height of the first liquid flow channel is H, the length of the molding part is L, and the height of the flow channel unit is h. Then, the following relationship is satisfied between them: H=(0.9~1.1)L, L=(10~15)h.

5. The special mold for compression molding of a collection tube as described in any one of claims 1-4, characterized in that: The mold core base has a first snap-fit ​​groove and a second snap-fit ​​groove arranged coaxially inside, and the second snap-fit ​​groove extends to the end face of the mold core base. The diameter of the first snap-fit ​​groove is smaller than that of the second snap-fit ​​groove. The mold core is connected to the second snap-fit ​​groove, and the upper end of the inner sleeve passes through the second snap-fit ​​groove and snaps into the first snap-fit ​​groove.

6. The special mold for compression molding of a collection tube as described in claim 5, characterized in that: The upper end of the mold core is provided with a retainer, and a base plate is provided between the retainer and the mold core. The retainer is engaged with the second retaining groove, and the mold core base abuts against the base plate.

7. The special mold for compression molding of a collection tube as described in claim 6, characterized in that: The card holder has an internal liquid inlet hole that communicates with the first snap-fit ​​groove. The inner sleeve includes an inner sleeve body that is inserted into the mold core and a first snap-fit ​​part disposed on the upper end of the inner sleeve body. A second snap-fit ​​part is provided between the first snap-fit ​​part and the inner sleeve body. The first snap-fit ​​part snaps into the first snap-fit ​​groove. A first cavity is formed between the second snap-fit ​​part and the inner wall of the first snap-fit ​​groove. The first cavity is communicated with the second liquid inlet. A second cavity is formed between the second snap-fit ​​part and the inner wall of the liquid inlet hole. The first cavity and the second liquid flow channel are both communicated with the second cavity.

8. The special mold for compression molding of a collection tube as described in claim 7, characterized in that: The liquid inlet hole is a stepped hole, comprising a first hole body and a second hole body, wherein the first hole body is located above the second hole body and has a larger diameter than the second hole body; The second cavity includes a cavity unit one and a cavity unit two that are connected to each other. The cavity unit one is connected to the first cavity, and the cavity unit two is connected to the second liquid flow channel. A guide portion is provided on one side of the lower end of the second snap-fit ​​portion. The upper end of the second snap-fit ​​portion forms a cavity unit between itself and the inner wall of the first hole. The guide portion and the second cavity form a cavity unit. The lower end of the second snap-fit ​​portion, opposite to the guide portion, is in contact with the inner wall of the second hole.

9. The special mold for compression molding collection tubes as described in any one of claims 1-4, characterized in that: The mold core has a mold core flow channel extending to its upper end face inside, and the mold core flow channel is connected to the second liquid inlet; The inner sleeve is provided with an inner sleeve flow channel extending to both ends of the inner sleeve, and the two ends of the inner sleeve flow channel are respectively connected to the mold core flow channel and the second liquid outlet.

10. The special mold for compression molding of a collection tube as described in claim 9, characterized in that: The second liquid outlet is located above the second liquid inlet. The mold core seat is also provided with a connecting channel, and the two ends of the connecting channel are respectively connected to the second liquid outlet and the inner sleeve flow channel.

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