CN111958918A - A kind of lancet injection mold and lancet injection molding process - Google Patents

Abstract

The invention relates to the production technology of blood collection needles, and discloses an injection mold for blood collection needles and an injection molding process for blood collection needles. The injection mold is formed by combining an upper mold and a lower mold. Cavity, the mold cavity includes the connected needle cap cavity and the needle handle cavity, the lower mold is provided with a glue inlet and a main flow channel, the glue inlet is communicated with the mold cavity, and the upper mold is provided with a glue injection nozzle that communicates with the main flow channel, and the glue feeds The mouth is located at the end of the needle handle cavity away from the needle cap cavity, the glue inlet and the plane where the end of the needle handle cavity is located are at a preset angle, and the connection point between the glue inlet and the needle handle cavity is set away from the needle body. The injection molding process includes: releasing the needle , mold clamping, glue feeding, mold opening and other steps. By modifying the position of the glue inlet and adjusting the glue feeding direction, the invention solves the problem that the injection-molded blood collection needle body is easy to translate in the needle handle, resulting in insufficient penetration into the skin and increasing pain; process, reduce the injection molding process steps such as cutting and human inspection, and save costs.

Description

A kind of lancet injection mold and lancet injection molding process

technical field

The invention relates to the technical field of lancet production, in particular to a lancet injection mold and an injection molding process thereof.

Background technique

In the prior art, the blood collection needles are all injection-molded by an injection molding machine. Before injection molding, the needle body should first be placed in the corresponding position of the lower mold, and then the injection molding machine will carry out the injection molding process such as mold clamping. When the traditional injection mold is injected, its injection port (plastic inlet) is the top position of the needle cap, and its injection direction is the horizontal direction. The position of the injection mold near the end of the needle handle requires a needle body limit rod, resulting in a hollow structure at the end of the needle handle of the injection-molded lancet. The depth is not enough, while increasing the pain. The commonly used solutions are: 1) Bend the end of the needle body in the needle handle during the injection molding process; 2) Use special materials for 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. But special materials are more expensive, so both solutions add cost and are time-consuming and labor-intensive. Therefore, it is necessary to design an injection-type lancet, which can solve the above problems.

The traditional injection molding process steps are more complicated. After injection molding, the injection molded blood collection needle needs to be cut. After cutting, it needs to be checked manually to check whether it is qualified, and finally counted and packaged. The injection molding process is complicated and wasteful. Manpower requires more investment in human resources, and the injection-molded lancet has certain defects.

SUMMARY OF THE INVENTION

Purpose of the invention: In view of the problems existing in the prior art, the present invention provides a blood collection needle injection mold and a blood collection needle injection molding process. The needle body is easy to move in the needle handle, resulting in insufficient depth of penetration into the skin and increasing pain; and the injection molding process is performed through the corresponding injection mold to reduce the corresponding injection process steps such as cutting, human inspection, and counting, and save costs.

Technical solution: The present invention provides an injection mold for blood collection needles, which is formed by combining 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 of the mold cavities respectively includes The needle cap cavity and the needle handle cavity communicate with each other, the lower mold is provided with glue inlets corresponding to each of the mold cavities and the same in number, and the main channel communicated with the glue inlets, and the upper mold passes through the upper mold. The glue injection nozzle is communicated with the main flow channel, and each glue inlet is communicated with its corresponding mold cavity. The glue inlet is arranged at the end of the needle handle cavity away from the needle cap cavity, and the glue inlet The plane where the end of the needle handle cavity is located is at a preset angle, and the connection point between the glue inlet and the needle handle cavity is set away from the needle body.

Further, the preset included angle is 30-45 degrees.

Further, the mold also includes a needle body fixing mechanism, and the needle body fixing mechanism includes at least two needle holders arranged in the lower mould and at least one needle pressing rod arranged in the upper mould. , the needle holder and the needle body are in the same plane.

Further, the top of the needle holder is V-shaped.

Further, the number of the needle press bars is equal to the number of the needle racks, and each of the needle press bars is disposed opposite to each of the needle racks.

Further, the needle body fixing mechanism further includes a magnet frame disposed in the lower mold, and the magnet frame is located directly below the needle body.

Further, at least one flow channel ejector rod is arranged below the main flow channel at intervals along its length direction, and the flow channel ejector bar is perpendicular to the main flow channel and can move up and down relative to the main flow channel.

Further, at least two product ejector pins are provided on the lower mold, and the product ejector pins are located directly below the lower mold cavity.

Further, an ejector pin fixing plate is also provided below the lower mold, and the ejector pin fixing plate is fixedly connected with the bottom end of the runner ejector pin and the bottom end of the product ejector pin, and a mold is also provided directly below the mold. An ejection hole, the die ejection hole is directly opposite to the ejector pin fixing plate.

The invention also discloses a lancet injection molding process, the injection molding process comprises the following steps:

S1: put the needle, and place the needle body on the needle holder of the injection mold in the S1;

S2: Clamp the mold, align and compress the upper mold and the lower mold of the injection mold;

S3: Inject glue, inject plastic melt from the nozzle of the glue injection machine through the glue inlet and enter the mold cavity from the end of the needle handle cavity until the plastic melt fills the entire mold cavity and seal molding;

S4: Open the mold, after cooling and forming, take out the formed blood collection needle from the mold cavity of the injection mold and pack it into a finished blood collection needle.

Beneficial effects:

1. In the present invention, the glue inlet is located at the end of the needle handle cavity far from the needle cap cavity, the glue inlet direction is a preset angle with the horizontal direction of the needle body, and the position of the needle body is deviated from the needle body. During the injection molding process, the horizontal force of the plastic extrusion needle body becomes smaller, and the needle body will not be squeezed to the front.

2. The present invention fixes the needle body through the needle body fixing mechanism, and only needs to fix the needle body on the needle holder, and the needle body is pressed in the middle by the needle pressing rod and the needle holder, which solves the limitation of the up and down displacement of the needle body and also solves the problem. The horizontal movement of the needle body is impacted by the plastic melt. Because the horizontal force of the plastic extrusion needle body becomes smaller during the injection molding process, the force for fixing the needle body does not need to be very large, so the present invention reduces the number of the needle pressing bars, and sets the needle pressing bars and the needle holder correspondingly. The appearance of the needle body is more beautiful, and on the other hand, the needle body can be compressed better.

3. In the present invention, since the latent glue feeding is used, the end of the lancet handle is automatically separated from the glue inlet when the lancet is released from the mold, which can reduce the later shearing process, and the incision is smaller and more flat.

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, artificial detection, etc. during injection molding. Cutting, there is no need to manually check whether the appearance is qualified, because after injection molding, when demoulding, the glue inlet and the needle handle are automatically cut off. The traditional injection molding process requires manual inspection of the appearance because it needs to be cut after injection molding, and the appearance is easily damaged during the cutting process, resulting in unqualified blood collection needles. process.

Description of drawings

Fig. 1 is a schematic diagram of the lower die structure of the present invention;

Fig. 2 is a schematic diagram of the upper die structure of the present invention;

3 is a schematic diagram of the overall structure of the mold of the present invention;

Fig. 4 is the side sectional view when the upper mold and the lower mold of the injection mold of the present invention are aligned;

Fig. 5 is the enlarged view of A place in Fig. 4;

FIG. 6 is a schematic structural diagram of the injection-type lancet injection molded from the injection mold of the present invention.

Among them, 1- Needle body, 101- Needle tip, 2- Needle handle, 201- Needle pressing point groove, 202- Needle holder groove, 203- Magnet holder groove, 3- Needle cap, 4- Limit groove, 5- Reinforcing rib , 6-limiting piece, 100-lower die, 1001-plastic injection nozzle, 1002-main channel, 1003-plastic inlet, 1004-runner ejector, 1005-product ejector, 1006- ejector fixing plate, 1007-mould ejection hole, 200-upper die, 300-mold cavity, 3001-needle cap cavity, 3002-needle handle cavity, 400-needle holder, 500-needle pressing rod, 600-magnet holder, 700-injection machine top out.

Detailed ways

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

In the description of the present invention, it should be understood that the terms "center", "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, axial, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of It is convenient to describe the present invention and to simplify the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

Referring to FIG. 1, the present invention discloses an injection mold for blood collection needles. The mold is formed by combining an upper mold 200 and a lower mold 100. The upper mold 200 and the lower mold 100 are provided with at least one cavity 300 corresponding to each other. In this embodiment, a plurality of mold cavities 300 are taken as an example. Each mold cavity 300 includes a needle cap cavity 3001 and a needle handle cavity 3002 which are connected to each other. The mouth 1003, the main flow channel 1002 communicated with the glue inlet 1003, the glue inlet 1003 is communicated with the mold cavity 300, the upper mold 200 is provided with a glue injection nozzle 1001, the glue injection nozzle 1001 is communicated with the main flow channel 1002, and 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 at a preset angle, and the connection point between the glue inlet 1003 and the needle handle cavity 3002 is offset from the needle body 1 set up. In this embodiment, the preset included angle a is set to be 30-45 degrees, see FIG. 5 . In this way, the horizontal force of the plastic extrusion needle body 1 becomes smaller during the injection molding process.

The mold also includes a needle body fixing mechanism, and the needle body fixing mechanism includes at least two needle holders 400 arranged on the lower mould 100 and at least one needle pressing rod 500 arranged on the upper mould 200, and the needle body 1, the needle holder 400 and the needle press bar 500 are located on the same plane. The needle body 1 is placed on the needle holder 400. When the upper die 200 and the lower die 100 are aligned, the needle pressing rod 500 and the needle holder 400 press the needle body 1 tightly. In this embodiment, the upper end of the needle holder 400 is set in a V-shape, so that the needle body 1 is placed in the middle of the V-shape, which can prevent the needle body 1 from falling.

In this embodiment, the number of the needle press bars 500 is equal to the number of needle bars 400, and each needle press bar 500 is arranged opposite to each needle holder 400, and the number of the needle bars 400 and the needle press bars 500 is two. . Because the horizontal force of the plastic extrusion needle body 1 becomes smaller during the injection molding process, the force for fixing the needle body 1 does not need to be very large, so the present invention reduces the number of 500 needle pressing rods, and sets the needle pressing rod 500 and the needle holder 400 Correspondingly arranged, on the one hand, the appearance of the needle body 1 is more beautiful, and on the other hand, the needle body 1 can be better compressed.

In this embodiment, in order to more stably fix the needle body 1 on the needle frame 400, the needle body fixing mechanism further includes a magnet frame 600 disposed on the lower die 100, the magnet frame 600 is located between the two needle frames 400, and the magnet The rack 600 is used for adsorbing 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.

Below the main flow channel 1002 of the lower mold 100, at least one flow channel ejector rod 1004 is spaced along its length direction. Referring to FIG. 1 , FIG. 3 and FIG. 4 , the flow channel ejector pin 1004 is perpendicular to the main flow channel 1002 and can be opposite to It moves up and down in the main channel 1002 .

The lower mold 100 is also provided with at least two product ejectors 1005 . In this embodiment, two product ejectors 1005 are used, and the product ejectors 1005 are both located directly below the mold cavity 300 of the lower mold 100 .

The lower die 100 is also provided with an ejector pin fixing plate 1006. The ejector pin fixing plate 1006 is fixedly connected with the bottom end of the runner ejector pin 1004 and the bottom end of the product ejector pin 1005. The ejection hole 1007 is directly opposite to the ejector pin fixing plate 1006 .

When demoulding is required, referring to FIG. 3 , the ejector rod 700 of the injection molding machine on the injection molding machine below the mold extends into the ejection hole 1007 of the mold, and the product ejector rod 1005 and The runner ejector pin 1004 moves upward under the action of the ejector pin fixing plate 1006 to eject the die cavity 300 and the main runner 1002 .

A lancet injection molding process disclosed in the present invention, the injection molding process is performed based on the above-mentioned injection mold, and includes the following steps:

S1: Prefabricated, prefabricated needle body and the above injection mold.

S2: Place the needle, and place 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.

S3: Clamp the mold, press the upper mold 200 and the lower mold 100 together, and press the needle bar 500 and the needle holder 400 tightly. At this time, the magnet holder 600 adsorbs the needle body 1, and the needle press bar 500 and the needle holder 400 compresses the needle body 1 in the middle of the needle holder 400 to prevent the needle body 1 from moving during the glue injection process.

S4: Feeding glue, injecting plastic melt from the glue injection nozzle 1001 through the main flow channel 1002 and the glue inlet 1003, and then entering the mold cavity 300 from the end of the needle handle cavity 3002 until the plastic melt fills the entire mold cavity 300, sealed and formed. During the glue feeding process, the glue feeding direction is latent glue feeding, and the preset angle between the glue feeding port 1003 and the horizontal direction of the needle body 1 is 20-85 degrees, so the glue feeding port 1003 is inclined downward to inject glue into the mold cavity 300 .

S5: Open the mold, after cooling and forming, take out the formed blood collection needle from the mold and pack it into a finished blood collection needle. The removal of the blood collection needle from the mold is achieved by the upward movement of the product ejector pin 1005 and the runner ejector pin 1004 in the lower mold 100 , when the product ejector pin 1005 and the runner 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 formed blood collection needle up, and the runner ejector pin 1004 lifts the main flow channel 1002 At the same time that the injection-molded colloid moves upward, 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 is offset from the needle body 1, such as As shown in Figure 4, the connection point is the point with the smallest inner diameter of the glue inlet, and the connection point and the end of the needle handle cavity 3002 are also solid molds. When the needle and the molding colloid in the main channel 1002 move up, the mold above the connection point is relatively sharp, and it is easy to cut and separate the connection point when the blood collection needle moves up, so as to avoid secondary cutting after demolding.

In the present invention, the injection-type lancet made by using the above-mentioned injection mold through the injection molding process is shown in FIG. 4 . In the needle handle 2, the needle tip 101 protrudes 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 integrally injection-molded, and the end of the needle body 1 away from the needle tip 101 is seamless with the end of the needle handle 2 touch.

In the needle handle 2, at least one needle pressing point groove 201 is provided on one side of the needle body 1, and at least two needle holder grooves 202 are provided on the other side of the needle body 1, the needle pressing point groove 201 and the needle holder groove 202 Both are communicated with the inside of the needle handle 2 .

The number of the needle pressing point grooves 201 is equal to the number of the needle holder grooves 202 , and each of the needle pressing point grooves 201 and each needle holder groove 202 are arranged opposite to each other. There are two needle pressing point grooves 201 and two needle holder grooves 202 , which are respectively distributed at the front end and the rear end of the needle handle 2 . A magnet holder slot 203 is also provided at the lower end of the needle handle 2 . A reinforcing rib 5 is also provided 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 , along the outer circumference of the needle handle 2 of the magnet frame groove 203 .

The end of the needle handle 2 close to the needle cap 3 is also provided with a limit piece 6. The plane of the limit piece 6 is perpendicular to the line where the needle body 1 is located. When the blood collection needle is in use, the limit piece can ensure that the blood collection needle is vertical when it is inserted into the skin. It is inserted into the skin to prevent the increase of pain caused by the skewed lancet.

The axial cross-sectional shape of the needle handle 2 is trapezoidal, 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 , and the shape of the needle cap 3 is a disc. The needle handle 2 and the needle cap 3 are made of ABS plastic. The needle body 1 is made of stainless steel.

During injection molding, choose to inject glue from the end of the needle handle 2, and use the latent injection method. The end of the body 1 and the end of the needle handle 2 are in seamless contact, and the end of the needle handle 2 is not a hollow structure. When in use, the needle body 1 directly pushes against the end of the needle handle 2, and the needle body will not move slightly.

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose is to enable those who are familiar with the art to understand the content of the present invention and implement it accordingly, and cannot limit the protection scope of the present invention. All equivalent transformations or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (10)

1. A blood taking needle injection mold is formed by closing an upper mold (200) and a lower mold (100), wherein the upper mold (200) and the lower mold (100) are provided with at least one mold cavity (300) which correspond to each other, each mold cavity (300) respectively comprises a needle cap cavity (3001) and a needle handle cavity (3002) which are communicated with each other, the injection mold is characterized in that the lower mold (100) is provided with glue inlets (1003) which are correspondingly arranged with each mold cavity (300) and are equal in number and a main runner (1002) which is communicated with the glue inlets (1003), the upper mold (200) is communicated with the main runner (1002) through a glue injection machine nozzle (1001), each glue inlet (1003) is communicated with the mold cavity (300) which corresponds to the glue inlet, the glue inlet (1003) is arranged at one end, far away from the needle cap cavity (3001), of the glue inlet (1003) and the plane where the tail end of the needle handle cavity (3002) is located are preset included angles, and the joint point of the glue inlet (1003) and the needle handle cavity (3002) is arranged deviating from the needle body (1).

2. The blood lancet injection mold according to claim 1, wherein the preset included angle is 30-45 degrees.

3. The injection mold for the blood collection needle according to claim 1, further comprising a needle body fixing mechanism comprising at least 2 needle holders (400) provided in the lower mold (100) and at least 1 needle presser bar (500) provided in the upper mold (200), the needle presser bar (500), the needle holders (400) and the needle body (1) being located in the same plane.

4. The lancet injection mold according to claim 3, wherein the needle frame (400) is V-shaped at the top end.

5. The lancet injection mold according to claim 3, wherein the pressing needle bars (500) are equal in number to the needle holders (400), and each of the pressing needle bars (500) is disposed opposite to each of the needle holders (400).

6. The injection mold for a lancet according to claim 3, wherein the needle body fixing mechanism further comprises a magnet frame (600) provided in the lower mold (100), the magnet frame (600) being located right under the needle body (1).

7. The blood lancet injection mold according to claim 3, wherein at least one runner ejector pin (1004) is provided at an interval along a length direction of the main flow channel (1002) below the main flow channel (1002), and the runner ejector pin (1004) is perpendicular to the main flow channel (1002) and can move up and down relative to the main flow channel (1002).

8. The injection mold for the blood collection needle according to claim 7, wherein the lower mold (100) is further provided with at least two product ejector rods (1005), and the product ejector rods (1005) are positioned right below the mold cavity (300) of the lower mold (100).

9. The injection mold for the blood taking needle according to claim 8, wherein a top rod fixing plate (1006) is further arranged below the lower mold (100), the top rod fixing plate (1006) is fixedly connected with the bottom end of the runner top rod (1004) and the bottom end of the product top rod (1005), a mold top hole (1007) is further arranged right below the mold, and the mold top hole (1007) is opposite to the top rod fixing plate (1006).

10. An injection molding process for a blood lancet according to any one of claims 1 to 9, wherein the injection molding process comprises the steps of:

s1: placing the needle, namely placing the needle body (1) on a needle frame (400) of the injection mold in the S1;

s2: closing the mold, namely closing and pressing an upper mold (200) and a lower mold (100) of the injection mold;

s3: injecting glue, namely injecting a plastic melt from a glue injection machine nozzle (1001) to enter a mold cavity (300) from the tail end of a needle handle cavity (3002) after passing through a glue injection port (1003) until the whole mold cavity (300) is filled with the plastic melt, and sealing and molding;

s4: and (3) opening the mould, taking out the formed blood taking needle from the mould cavity (300) of the injection mould after cooling and forming, and packaging to obtain a blood taking needle finished product.

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