Blood collection needle injection mold and blood collection needle injection molding process

Abstract

The present invention relates to the field of blood collection needle production technology, and discloses a blood collection needle injection mold and a blood collection needle injection molding process. The injection mold is formed by an upper mold and a lower mold, and the upper mold and the lower mold are provided with at least one mold cavity corresponding to each other, and the mold cavity includes a needle cap cavity and a needle handle cavity that are connected. The lower mold is provided with a glue inlet and a main flow channel, and the glue inlet is connected with the mold cavity. The upper mold is provided with a glue injection machine nozzle connected with the main flow channel. The glue inlet is located at one end of the needle handle cavity away from the needle cap cavity, and the glue inlet and the plane where the end of the needle handle cavity is located form a preset angle, and the connection point between the glue inlet and the needle handle cavity deviates from the needle body setting. The injection molding process includes: needle placement, mold closing, glue injection, mold opening and other steps. The present invention solves the problem that the injection molded blood collection needle body is easy to translate in the needle handle, resulting in insufficient penetration depth into the skin and increased pain by modifying the glue inlet position and adjusting the glue injection direction; and performs the injection molding process through the corresponding injection mold, reducing the injection molding process steps such as cutting and manual inspection, and saving costs.

Description

Technical Field

[0001] The invention relates to the technical field of blood collection needle production, and in particular to a blood collection needle injection mold and an injection molding process thereof. Background Art

[0002] In the prior art, blood collection needles are all injection molded using injection molding machines. Before injection molding, the needle body must first be placed in the corresponding position of the lower mold, and then the injection molding machine performs injection molding processes such as mold closing. When the traditional injection mold is used for injection molding, its injection port (glue inlet) is at the top of the needle cap, and its injection direction is horizontal. When the injection molding starts, a force will be applied to the needle body toward the end of the needle handle. Therefore, a needle body limit rod is required near the end of the needle handle on the traditional injection mold, resulting in a hollow structure at the end of the needle handle of the injection molded blood collection needle. During use, the needle body of the blood collection needle is easy to move in the needle handle, resulting in insufficient penetration into the skin and increased pain. Common solutions are: 1) bend the end of the needle body and set it in the needle handle during the injection molding process; 2) use special materials to perform injection molding of the blood collection needle during the injection molding process to increase the pulling force between the needle body and the needle handle. However, special materials are expensive, so both solutions require increased costs and are time-consuming and labor-intensive. Therefore, it is necessary to design an injection-type blood collection needle to solve the above problems.

[0003] The traditional injection molding process is relatively complicated. After the injection molding, the injection molded blood collection needle needs to be cut. After cutting, it needs to be manually inspected to check whether it is qualified, and finally counted and packaged. The injection molding process is relatively complicated and wastes manpower. It requires more human resources, and the injection molded blood collection needles have certain defects. Summary of the invention

[0004] Purpose of the invention: In view of the problems existing in the prior art, the present invention provides an injection mold for a blood collection needle and an injection molding process for a blood collection needle. The injection mold solves the problem that the needle body of the injection-molded blood collection needle in the prior art is easy to move in the needle handle, resulting in insufficient penetration into the skin and increased pain by modifying the position of the glue inlet and adjusting the glue feeding direction; and the injection molding process is carried out through the corresponding injection mold, thereby reducing the corresponding injection molding process steps such as cutting, manual inspection, and counting, thereby saving costs.

[0005] Technical solution: The present invention provides an injection mold for a blood collection needle, which is formed by an upper mold and a lower mold. The upper mold and the lower mold are provided with at least one mold cavity corresponding to each other, and each mold cavity respectively includes a needle cap cavity and a needle handle cavity that are connected. The lower mold is provided with glue inlets that are arranged corresponding to each of the mold cavities and are equal in number, and a main flow channel connected to the glue inlets. The upper mold is connected to the main flow channel through an injection machine nozzle, and each of the glue inlets is connected to the corresponding mold cavity. The glue inlet is arranged at one end of the needle handle cavity away from the needle cap cavity, and the glue inlet forms a preset angle with the plane where the end of the needle handle cavity is located, and the connection point between the glue inlet and the needle handle cavity deviates from the needle body setting.

[0006] Furthermore, the preset angle is 30-45 degrees.

[0007] Furthermore, the mold also includes a needle body fixing mechanism, which includes at least two needle racks arranged in the lower mold and at least one needle pressing rod arranged in the upper mold, and the needle pressing rod, needle rack and needle body are located in the same plane.

[0008] Furthermore, the top end of the needle holder is V-shaped.

[0009] Furthermore, the number of the needle pressing rods is equal to the number of the needle racks, and each of the needle pressing rods is arranged opposite to each of the needle racks.

[0010] Furthermore, the needle body fixing mechanism also includes a magnet frame arranged in the lower mold, and the magnet frame is located directly below the needle body.

[0011] Furthermore, at least one flow channel top rod is arranged at intervals below the main flow channel along its length direction, and the flow channel top rod is perpendicular to the main flow channel and can move up and down relative to the main flow channel.

[0012] Furthermore, at least two product ejector pins are provided on the lower mold, and the product ejector pins are located directly below the mold cavity of the lower mold.

[0013] Furthermore, a push rod fixing plate is provided below the lower mold, and the push rod fixing plate is fixedly connected to the bottom ends of the runner push rod and the product push rod. A mold ejection hole is also provided directly below the mold, and the mold ejection hole is directly opposite to the push rod fixing plate.

[0014] The present invention also discloses a blood collection needle injection molding process, the injection molding process comprising the following steps:

[0015] S1: placing the needle, placing the needle body on the needle holder of the injection mold in S1;

[0016] S2: closing the mold, pressing the upper mold and the lower mold of the injection mold together;

[0017] S3: Injecting plastic from the injection machine nozzle, injecting plastic melt through the injection port and then into the mold cavity from the end of the needle handle cavity until the plastic melt fills the entire mold cavity and seals the mold;

[0018] S4: Open the mold, cool and mold, take out the molded blood collection needle from the mold cavity of the injection mold, and package it as a finished blood collection needle.

[0019] Beneficial effects:

[0020] 1. The present invention sets a glue inlet at the end of the needle handle cavity away from the needle cap cavity. The glue feeding direction of the glue inlet is a preset angle with the horizontal direction of the needle body and deviates from the position of the needle body. A latent glue feeding is adopted. In this way, the horizontal force of the plastic squeezing the needle body during the injection molding process becomes smaller, and the needle body will not be squeezed forward.

[0021] 2. The present invention fixes the needle body through the needle body fixing mechanism. It only needs to fix the needle body on the needle holder. The needle body is pressed in the middle by the needle pressing rod and the needle holder, which solves the limitation of the needle body's up and down displacement and also solves the horizontal movement of the needle body impacted by the plastic melt. Because the horizontal force of the plastic squeezing the needle body becomes smaller during the injection molding process, the force to fix the needle body does not need to be very large, so the present invention reduces the number of needle pressing rods, and sets the needle pressing rods and the needle holder to correspond to each other, which makes the appearance of the needle body more beautiful on the one hand, and can better press the needle body on the other hand.

[0022] 3. The present invention uses latent glue injection, and the end of the blood collection needle handle is automatically separated from the glue injection port when the blood collection needle is ejected from the mold, which can reduce the later shearing process, and the incision is small and smoother.

[0023] 4. The present invention saves the steps of the injection molding process by using the injection mold. The traditional injection mold requires injection molding, cutting, manual inspection, etc. during injection molding, while the injection molding process of the present invention only requires injection molding, and no additional cutting is required, nor is it necessary to manually inspect whether its appearance is qualified, because after injection molding, when demolding, the glue inlet and the needle handle are automatically cut off. The traditional injection molding process requires manual inspection of the appearance because cutting is required after injection molding, and the appearance is easily damaged during the cutting process, resulting in unqualified blood collection needles. The present invention saves the cutting process, thereby omitting the process of manual inspection of the appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the lower mold structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the upper mold structure of the present invention;

[0026] Figure 3 It is a schematic diagram of the overall structure of the mold of the present invention;

[0027] Figure 4It is a side cross-sectional view of the upper mold and the lower mold of the injection mold of the present invention when they are aligned;

[0028] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0029] Figure 6 The figure is a schematic diagram of the structure of an injection-type blood collection needle molded by the injection mold of the present invention.

[0030] Among them, 1-needle body, 101-needle tip, 2-needle handle, 201-needle pressure point groove, 202-needle holder groove, 203-magnet holder groove, 3-needle cap, 4-limiting groove, 5-reinforcement rib, 6-limiting plate, 100-lower mold, 1001-injection machine nozzle, 1002-main channel, 1003-glue inlet, 1004-runner ejector rod, 1005-product ejector rod, 1006-ejector rod fixing plate, 1007-mold ejector hole, 200-upper mold, 300-mold cavity, 3001-needle cap cavity, 3002-needle handle cavity, 400-needle holder, 500-needle pressure rod, 600-magnet holder, 700-injection molding machine ejector rod. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0032] In the description of the present invention, it is necessary to understand that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] See attached Figure 1The present invention discloses a blood collection needle injection mold, which is formed by an upper mold 200 and a lower mold 100. The upper mold 200 and the lower mold 100 are provided with at least one mold cavity 300 corresponding to each other. In this embodiment, multiple mold cavities 300 are taken as an example, and each mold cavity 300 includes a needle cap cavity 3001 and a needle handle cavity 3002 connected to each other. The lower mold 100 is provided with a glue inlet 1003 and a glue inlet 1003 corresponding to each mold cavity 300 and an equal number of glue inlets 1003. 003 is connected to the main channel 1002, the glue inlet 1003 is connected to the mold cavity 300, the upper mold 200 is provided with a glue injection machine nozzle 1001, the glue injection machine nozzle 1001 is connected to the main channel 1002, the glue inlet 1003 is arranged at the end of the needle handle cavity 3002 away from the needle cap cavity 3001, the glue inlet 1003 and the plane where the end of the needle handle cavity 3002 is located form a preset angle, and the connection point between the glue inlet 1003 and the needle handle cavity 3002 is set away from the needle body 1. In this embodiment, the preset angle a is set to 30-45 degrees, see the attached Figure 5 In this way, the horizontal force of the plastic squeezing the needle body 1 during the injection molding process becomes smaller.

[0034] The mold also includes a needle body fixing mechanism, which includes at least two needle racks 400 arranged on the lower mold 100 and at least one needle pressing rod 500 arranged on the upper mold 200, and the needle body 1, the needle rack 400 and the needle pressing rod 500 are located in the same plane. The needle body 1 is placed on the needle rack 400, and when the upper mold 200 and the lower mold 100 are aligned, the needle pressing rod 500 and the needle rack 400 press the needle body 1 tightly. In this embodiment, the upper end of the needle rack 400 is set in a V shape, so that the needle body 1 is placed in the middle of the V shape to prevent the needle body 1 from falling.

[0035] In this embodiment, the number of needle pressing rods 500 is equal to the number of needle racks 400, and each needle pressing rod 500 is arranged opposite to each needle rack 400, and the number of needle racks 400 and needle pressing rods 500 is 2. Because the horizontal force of the plastic squeezing the needle body 1 during the injection molding process becomes smaller, the force to fix the needle body 1 does not need to be very large, so the present invention reduces the number of needle pressing rods 500, and sets the needle pressing rod 500 and the needle rack 400 to correspond to each other, which makes the appearance of the needle body 1 more beautiful on the one hand, and can better press the needle body 1 on the other hand.

[0036] In this embodiment, in order to more stably fix the needle body 1 on the needle holder 400, the needle body fixing mechanism also includes a magnet frame 600 arranged on the lower mold 100, and the magnet frame 600 is located between the two needle holders 400. The magnet frame 600 is used to adsorb the needle body 1 to prevent the needle body 1 from falling when the upper mold 200 and the lower mold 100 are not aligned.

[0037] At least one runner ejector rod 1004 is disposed at intervals along the length direction of the main runner 1002 of the lower mold 100. Figure 1, Attachment Figure 3 and attached Figure 4 The flow channel top rod 1004 is perpendicular to the main flow channel 1002 and can move up and down relative to the main flow channel 1002 .

[0038] At least two product ejector pins 1005 are also provided on the lower mold 100 . In the present embodiment, two product ejector pins 1005 are used, and both product ejector pins 1005 are located directly below the mold cavity 300 of the lower mold 100 .

[0039] A push rod fixing plate 1006 is also provided below the lower mold 100 , and the push rod fixing plate 1006 is fixedly connected to the bottom ends of the runner push rod 1004 and the product push rod 1005 . A mold ejection hole 1007 is also provided directly below the mold, and the mold ejection hole 1007 is directly opposite to the push rod fixing plate 1006 .

[0040] When demoulding is required, see the attached Figure 3 The ejector rod 700 on the injection molding machine below the mold extends from the mold ejector hole 1007. The upward force of the ejector rod of the injection molding machine causes the product ejector rod 1005 and the runner ejector rod 1004 to move upward under the action of the ejector rod fixing plate 1006, ejecting the mold cavity 300 and the main runner 1002.

[0041] The present invention discloses a blood collection needle injection molding process, which is based on the above-mentioned injection mold and includes the following steps:

[0042] S1: Prefabrication: prefabricate the needle body and the above-mentioned injection mold.

[0043] S2: placing the needle, placing the needle body 1 on the needle holder 400 of the injection mold in step S1. At this time, the needle body 1 is located on the V-shape at the top of the needle holder 400.

[0044] S3: Mold closing, the upper mold 200 and the lower mold 100 are pressed together, and the needle pressing rod 500 and the needle holder 400 are pressed together. At this time, the magnet holder 600 absorbs the needle body 1, and the needle pressing rod 500 and the needle holder 400 press the needle body 1 in the middle of the needle holder 400 to prevent the needle body 1 from moving during the injection process.

[0045] S4: Glue injection. Plastic melt is injected from the glue injection machine nozzle 1001 through the main channel 1002 and the glue inlet 1003, and then enters the mold cavity 300 from the end of the needle handle cavity 3002 until the plastic melt fills the entire mold cavity 300 and is sealed. During the glue injection process, the glue injection direction is latent glue injection. The preset angle between the glue inlet 1003 and the horizontal direction of the needle body 1 is 20-85 degrees, so the glue inlet 1003 is tilted downward to inject glue into the mold cavity 300.

[0046] S5: Open the mold, cool and mold, take out the molded blood collection needle from the mold and package it as a finished blood collection needle. The blood collection needle is taken out from the mold by moving the product ejector pin 1005 and the flow channel ejector pin 1004 upward in the lower mold 100. When the product ejector pin 1005 and the flow channel ejector pin 1004 move upward through the injection molding machine ejector pin 700 on the injection molding machine, the product ejector pin 1005 lifts the molded blood collection needle upward, and the flow channel ejector pin 1004 lifts the injection molded colloid in the main flow channel 1002 upward. At the same time, since the glue inlet 1003 and the plane where the end of the mold cavity 300 is located form a preset angle a, and the connection point between the glue inlet 1003 and the needle handle cavity 3002 deviates from the needle body 1, as shown in FIG. Figure 4 As shown, the connection point is the point with the smallest inner diameter of the glue inlet, and there is also a solid mold between the connection point and the end of the needle handle cavity 3002. When the product push rod 1005 and the flow channel push rod 1004 lift the molded blood collection needle and the molded colloid in the main flow channel 1002 to move upward, the mold above the connection point is relatively sharp, and it is easy to cut off and separate the connection point when the blood collection needle moves upward, avoiding secondary cutting after demolding.

[0047] The present invention uses the above-mentioned injection mold to inject the injection-type blood collection needle through the above-mentioned injection molding process. Figure 4 As shown, the injection-type blood collection needle comprises a needle body 1 with a needle tip 101, a needle handle 2 and a needle cap 3. The needle body 1 is fixed in the needle handle 2, the needle tip 101 extends from one end of the needle handle 2 and is inserted into the needle cap 3. The needle handle 2 and the needle cap 3 are an integral injection-molded structure, and the end of the needle body 1 away from the needle tip 101 is in seamless contact with the end of the needle handle 2.

[0048] At least one needle pressing point groove 201 is arranged on one side of the needle body 1 in the needle handle 2, and at least two needle holder grooves 202 are arranged on the other side of the needle body 1. Both the needle pressing point groove 201 and the needle holder groove 202 are connected to the inside of the needle handle 2.

[0049] The number of the needle pressing point grooves 201 is equal to the number of the needle frame grooves 202, and each needle pressing point groove 201 is arranged opposite to each needle frame groove 202. The number of the needle pressing point grooves 201 and the number of the needle frame grooves 202 are both 2, which are respectively distributed at the front end and the rear end of the needle handle 2. A magnet frame groove 203 is also arranged at the lower end of the needle handle 2. A reinforcing rib 5 is also arranged on the outer circumference of the middle part of the needle handle 2, and the reinforcing rib 5 is arranged at the position of the magnet frame groove 203 and arranged along the outer circumference of the needle handle 2 of the magnet frame groove 203.

[0050] A limiting plate 6 is also provided at one end of the needle handle 2 close to the needle cap 3. The plane where the limiting plate 6 is located is perpendicular to the straight line where the needle body 1 is located. When the blood collection needle is used, the limiting plate can ensure that the blood collection needle is inserted vertically into the skin while piercing the skin, thereby preventing the increase of pain caused by the tilt of the blood collection needle.

[0051] The axial cross-section of the needle handle 2 is trapezoidal, and the outer diameter of the end close to the needle cap 3 is smaller than the outer diameter of the end away from the needle cap 3. The shape of the needle cap 3 is disc-shaped. The needle handle 2 and the needle cap 3 are made of ABS plastic. The needle body 1 is made of stainless steel.

[0052] During injection molding, glue is injected from the end of the needle handle 2, and a latent glue injection method is used. The glue inlet is located at the end of the needle handle 2, and the glue is injected at a certain angle to reduce the impact force on the needle body 1. The end of the needle body 1 is in seamless contact with the end of the needle handle 2. The end of the needle handle 2 is not a hollow structure. When in use, the needle body 1 is directly against the end of the needle handle 2, and there will be no slight movement of the needle body.

[0053] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A blood collection needle injection mold, comprising an upper mold (200) and a lower mold (100) matched together, wherein the upper mold (200) and the lower mold (100) are provided with at least one mold cavity (300) corresponding to each other, and each mold cavity (300) comprises a needle cap cavity (3001) and a needle handle cavity (3002) connected to each other, characterized in that: The lower mold (100) is provided with glue inlets (1003) which are arranged in correspondence with each of the mold cavities (300) and are equal in number, and main channels (1002) which are connected with the glue inlets (1003); the upper mold (200) is connected with the main channel (1002) via a glue injection machine nozzle (1001); each of the glue inlets (1003) is connected with its corresponding mold cavity (300); the glue inlet (1003) is arranged at one end of the needle handle cavity (3002) away from the needle cap cavity (3001); the glue inlet (1003) and the plane where the end of the needle handle cavity (3002) is located form a preset angle; and the connection point between the glue inlet (1003) and the needle handle cavity (3002) is arranged away from the needle body (1).

2. The blood collection needle injection mold according to claim 1, characterized in that: The preset angle is 30-45 degrees.

3. The blood collection needle injection mold according to claim 1, characterized in that: The mold further comprises a needle body fixing mechanism, the needle body fixing mechanism comprising at least two needle racks (400) arranged in the lower mold (100) and at least one needle pressing rod (500) arranged in the upper mold (200), the needle pressing rod (500), the needle rack (400) and the needle body (1) being located in the same plane.

4. The blood collection needle injection mold according to claim 3, characterized in that: The top end of the needle holder (400) is V-shaped.

5. The blood collection needle injection mold according to claim 3, characterized in that: The number of the needle pressing rods (500) is equal to the number of the needle racks (400), and each of the needle pressing rods (500) is arranged opposite to each of the needle racks (400).

6. The blood collection needle injection mold according to claim 3, characterized in that: The needle body fixing mechanism further comprises a magnet frame (600) arranged in the lower mould (100), wherein the magnet frame (600) is located directly below the needle body (1).

7. The blood collection needle injection mold according to claim 3, characterized in that: At least one flow channel top rod (1004) is arranged at intervals below the main flow channel (1002) along its length direction; the flow channel top rod (1004) is perpendicular to the main flow channel (1002) and can move up and down relative to the main flow channel (1002).

8. The blood collection needle injection mold according to claim 7, characterized in that: At least two product ejector pins (1005) are also provided on the lower mold (100), and the product ejector pins (1005) are located directly below the mold cavity (300) of the lower mold (100).

9. The blood collection needle injection mold according to claim 8, characterized in that: A push rod fixing plate (1006) is also provided below the lower mold (100), and the push rod fixing plate (1006) is fixedly connected to the bottom ends of the flow channel push rod (1004) and the bottom ends of the product push rod (1005). A mold ejection hole (1007) is also provided directly below the mold, and the mold ejection hole (1007) is directly opposite to the push rod fixing plate (1006).

10. An injection molding process for a blood collection needle injection mold according to any one of claims 1 to 9, characterized in that: The injection molding process comprises the following steps: S1: placing the needle, placing the needle body (1) on the needle holder (400) of the injection mold; S2: closing the mold, and pressing the upper mold (200) and the lower mold (100) of the injection mold together; S3: injecting plastic from the injection nozzle (1001) through the injection port (1003) and then into the mold cavity (300) from the end of the needle handle cavity (3002) until the plastic melt fills the entire mold cavity (300) and is sealed and formed; S4: opening the mold, cooling and molding, taking out the molded blood collection needle from the mold cavity (300) of the injection mold, and packaging it as a finished blood collection needle.

Images