CN111958918A

CN111958918A - Blood taking needle injection mold and blood taking needle injection molding process

Info

Publication number: CN111958918A
Application number: CN202010745561.XA
Authority: CN
Inventors: 陈亮; 张千
Original assignee: Huaian Tianda Medical Instruments Co ltd
Current assignee: Huaian Tianda Medical Instruments Co ltd
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2020-11-20

Abstract

The invention relates to the technical field of blood taking needle production and discloses a blood taking needle injection mold and a blood taking needle injection process, wherein the injection mold is formed by closing an upper mold and a lower mold, the upper mold and the lower mold are provided with at least one mold cavity which corresponds to each other, the mold cavity comprises a needle cap cavity and a needle handle cavity which are communicated, the lower mold is provided with a glue inlet and a main flow passage, the glue inlet is communicated with the mold cavity, the upper mold is provided with a glue injection machine nozzle which is communicated with the main flow passage, the glue inlet is positioned at one end of the needle handle cavity, which is far away from the needle cap cavity, the glue inlet and the plane where the tail end of the needle handle cavity is positioned form a preset included angle, and the glue inlet and the joining: needle releasing, mold closing, glue feeding, mold opening and the like. According to the injection molding type blood taking needle, the positions of the glue inlets are modified and the glue inlet direction is adjusted, so that the problems that the needle body of the injection molding type blood taking needle is easy to translate in the needle handle, the skin pricking depth is insufficient, and the pain is increased are solved; and the injection molding process is carried out through the corresponding injection mold, so that the injection molding process steps such as cutting, personal inspection and the like are reduced, and the cost is saved.

Description

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

Technical Field

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

Background

In the prior art, blood taking needles are all injection molded by an injection molding machine. Before injection molding, the needle body is firstly placed at a corresponding position of a lower die, and then injection molding processes such as die assembly and the like are carried out by an injection molding machine. Traditional injection mold is when moulding plastics, its mouth of moulding plastics (advancing gluey mouth) is needle cap top position, and its direction of moulding plastics is the horizontal direction, when beginning to mould plastics, can give needle body one to the terminal power of needle handle, consequently, the last position that is close to the needle handle end of traditional injection mold needs a needle body gag lever post, thereby the needle handle end that leads to injection moulding's blood taking needle is hollow structure, the blood taking needle body removes in the needle handle easily in the use, lead to pricking the degree of depth of skin not enough, increase the pain simultaneously. The common solutions are: 1) the tail end of the needle body is bent and arranged in the needle handle in the injection molding process; 2) the special material is used for injection molding of the blood taking needle in the injection molding process, so that the drawing force between the needle body and the needle handle is increased. However, the special materials are expensive, so both solutions require increased costs and are time consuming and laborious. There is therefore a need for an injection lancet which solves the above problems.

Traditional injection molding process step is comparatively complicated, advances to glue and need to cut injection moulding's blood taking needle after moulding plastics, cuts the back and need carry out the manual detection, detects whether it is qualified, counts the packing at last again, and this injection molding process is comparatively complicated, and the manpower waste needs to drop into more manpower resources moreover, and the blood taking needle that forms of moulding plastics moreover has certain defect.

Disclosure of Invention

The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a blood taking needle injection mold and a blood taking needle injection process, wherein the injection mold solves the problems that the needle body of the blood taking needle formed by injection molding in the prior art is easy to move in the needle handle, so that the skin pricking depth is not enough and the pain is increased by modifying the position of a glue inlet and adjusting the glue inlet direction; and the corresponding injection molding process is carried out through the corresponding injection mold, so that the corresponding injection molding process steps of cutting, personal inspection, counting and the like are reduced, and the cost is saved.

The technical scheme is as follows: the invention provides a blood taking needle injection mold which is formed by closing an upper mold and a lower mold, wherein the upper mold and the lower mold are provided with at least one mold cavity corresponding to each other, each mold cavity respectively comprises a needle cap cavity and a needle handle cavity which are communicated, the lower mold is provided with glue inlets which are arranged corresponding to the mold cavities and are equal in number and a main runner communicated with the glue inlets, the upper mold is communicated with the main runner through a glue injection machine nozzle, each glue inlet is communicated with the corresponding mold cavity, the glue inlets are arranged at one end of the needle handle cavity far away from the needle cap cavity, a preset included angle is formed between the glue inlets and the plane of the tail end of the needle handle cavity, and the joint point of the glue inlets and the needle handle cavity is deviated from the needle body.

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

Further, the mould still includes needle body fixed establishment, needle body fixed establishment is including setting up 2 at least needle framves in the mould down and setting up 1 at least presser bar in the mould, presser bar, needle frame and needle body are located the coplanar.

Furthermore, the top end of the needle frame is V-shaped.

Further, the number of the needle pressing rods is equal to that of the needle frames, and each needle pressing rod is arranged opposite to each needle frame.

Further, the needle body fixing mechanism further comprises a magnet frame arranged in the lower die, and the magnet frame is located under the needle body.

Furthermore, at least one runner ejector rod is arranged below the main runner at intervals along the length direction of the main runner, and the runner ejector rod is perpendicular to the main runner and can move up and down relative to the main runner.

Furthermore, the lower die is also provided with at least two product ejector rods, and the product ejector rods are positioned right below the lower die cavity.

Further, an ejector rod fixing plate is arranged below the lower die and fixedly connected with the bottom end of the runner ejector rod and the bottom end of the product ejector rod, a die ejection hole is formed right below the die and is opposite to the ejector rod fixing plate.

The invention also discloses an injection molding process of the blood taking needle, which comprises the following steps:

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

s2: closing the mold, and closing and pressing an upper mold and a lower mold of the injection mold;

s3: feeding the plastic melt from the nozzle of the glue-injection machine, entering the mold cavity from the tail end of the needle handle cavity after passing through the glue inlet until the whole mold cavity is filled with the plastic melt, and sealing and molding;

s4: and (5) opening the mold, taking out the molded blood taking needle from the mold cavity of the injection mold after cooling molding, and packaging to obtain a finished blood taking needle product.

Has the advantages that:

1. according to the invention, the glue inlet is arranged at the tail end of the needle handle cavity far away from the needle cap cavity, the glue inlet direction of the glue inlet is a preset included angle with the horizontal direction of the needle body and deviates from the position of the needle body, and the latent glue inlet is adopted, so that the horizontal force of plastic extruding the needle body is reduced in the injection molding process, and the needle body cannot be extruded to the front.

2. The invention fixes the needle body through the needle body fixing mechanism, only the needle body needs to be fixed on the needle frame, and the needle body is pressed between the needle pressing rod and the needle frame, thereby solving the limitation of the vertical displacement of the needle body and simultaneously solving the horizontal movement of the needle body impacted by the plastic melt. Because the horizontal force of the plastic for extruding the needle body is reduced in the injection molding process, and the force for fixing the needle body does not need to be very large, the number of the needle pressing rods is reduced, and the needle pressing rods are arranged corresponding to the needle frame, so that the appearance of the needle body is more attractive on one hand, and the needle body can be better pressed on the other hand.

3. Because the latent type glue feeding is adopted, the tail end of the needle handle of the blood taking needle is automatically separated from the glue feeding port when the blood taking needle is discharged from the mold, so that the later shearing procedure can be omitted, and the incision is small and smoother.

4. The injection mold saves the steps of the injection molding process, and the traditional injection mold needs injection molding, cutting, manual detection and the like during injection molding, but the injection molding process only needs injection molding, does not need additional cutting, and does not need manual detection on whether the appearance of the injection mold is qualified or not, because the glue inlet and the needle handle are automatically cut off during demolding after injection molding. The appearance of the traditional injection molding process needs to be artificially detected because the traditional injection molding process needs to cut after injection molding, the appearance is easily damaged in the cutting process, and the finished blood taking needle is unqualified.

Drawings

FIG. 1 is a schematic view of the lower mold structure of the present invention;

FIG. 2 is a schematic view of the upper mold structure of the present invention;

FIG. 3 is a schematic view of the overall structure of the mold of the present invention;

FIG. 4 is a side sectional view of the injection mold of the present invention with the upper and lower dies mated;

FIG. 5 is an enlarged view taken at A in FIG. 4;

FIG. 6 is a schematic view of an injection type blood collection needle formed by injection molding of the injection mold of the present invention.

The injection molding machine comprises a needle body 1, a needle body 101, a needle point 2, a needle handle 201, a needle pressing point groove 202, a needle frame groove 203, a magnet frame groove 3, a needle cap 3, a limiting groove 4, a reinforcing rib 5, a limiting sheet 6, a lower die 100, a glue injection machine nozzle 1001, a main runner 1002, a glue inlet 1003, a runner ejector rod 1004, a product ejector rod 1005, an ejector rod fixing plate 1006, a die ejector hole 1007, a die upper die 200, a die cavity 300, a needle cap cavity 3001, a needle handle cavity 3002, a needle frame 400, a needle pressing rod 500, a magnet frame 600 and an injection molding machine ejector rod 700.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.

Referring to fig. 1, the present invention discloses a blood taking needle injection mold, which is formed by joining an upper mold 200 and a lower mold 100, wherein at least one mold cavity 300 corresponding to each other is arranged on the upper mold 200 and the lower mold 100, in the present embodiment, a plurality of mold cavities 300 are taken as an example, each mold cavity 300 respectively comprises a needle cap cavity 3001 and a needle handle cavity 3002 which are communicated with each other, the lower mold 100 is provided with glue inlets 1003 which are arranged corresponding to each mold cavity 300 and have the same number, and a main runner 1002 which is communicated with the glue inlets 1003, the glue inlets 1003 are communicated with the mold cavities 300, the upper mold 200 is provided with a glue injector nozzle 1001, the glue injector nozzle 1001 is communicated with the main runner 1002, the glue inlets 1003 are arranged at one end of the needle handle cavity 3002 far away from the needle cap cavity 3001, a preset included angle is formed between the glue inlets 1003 and the plane where the tail end of the needle handle cavity 3002 is located, and a joint point of the glue inlets 1003. In this embodiment, the preset included angle a is set to be 30-45 degrees, see fig. 5. Thus, the horizontal force of the plastic extrusion needle body 1 is reduced in the injection molding process.

The mold further comprises a needle body fixing mechanism, the needle body fixing mechanism comprises at least 2 needle frames 400 arranged on the lower mold 100 and at least 1 needle pressing rod 500 arranged on the upper mold 200, and the needle bodies 1, the needle frames 400 and the needle pressing rods 500 are located on the same plane. The needle body 1 is placed on the needle frame 400, and when the upper die 200 is aligned with the lower die 100, the needle pressing rod 500 and the needle frame 400 press the needle body 1. In this embodiment, the upper end of the needle frame 400 is formed in a V-shape, so that the needle body 1 is placed in the middle of the V-shape, and the needle body 1 can be prevented from falling.

In the present embodiment, the number of the presser bars 500 is equal to the number of the needle frames 400, each presser bar 500 is provided to face each needle frame 400, and the number of the presser bars 500 and the number of the needle frames 400 are 2. Because the horizontal force of the plastic extrusion needle body 1 is reduced in the injection molding process, the force for fixing the needle body 1 does not need to be very large, 500 needle pressing rods are reduced, and the needle pressing rods 500 are arranged corresponding to the needle frame 400, so that the appearance of the needle body 1 is more attractive on one hand, and the needle body 1 can be better pressed on the other hand.

In this embodiment, in order to fix the needle body 1 on the needle frame 400 more firmly, the needle body fixing mechanism further includes the magnet frame 600 disposed on the lower mold 100, the magnet frame 600 is located between the two needle frames 400, and the magnet frame 600 is used for adsorbing the needle body 1, so as to prevent the needle body 1 from dropping when the upper mold 200 and the lower mold 100 are not closed.

At least one runner post 1004 is arranged below the main runner 1002 of the lower mold 100 at intervals along the length direction thereof, referring to fig. 1, 3 and 4, and the runner post 1004 is perpendicular to the main runner 1002 and can move up and down relative to the main runner 1002.

At least 2 product push rods 1005 are further arranged on the

lower die

100, 2 product push rods 1005 are used in the embodiment, and the product push rods 1005 are all located right below the die cavity 300 of the lower die 100.

An ejector rod fixing plate 1006 is further arranged below the lower die 100, the ejector rod fixing plate 1006 is fixedly connected with the bottom end of the runner ejector rod 1004 and the bottom end of the product ejector rod 1005, a die ejection hole 1007 is further arranged right below the die, and the die ejection hole 1007 is right opposite to the ejector rod fixing plate 1006.

When demolding is required, referring to fig. 3, an injection molding machine ejector rod 700 on an injection molding machine below a mold extends into a mold ejection hole 1007, and the product ejector rod 1005 and the runner ejector rod 1004 are moved upward by an ejector rod fixing plate 1006 by an upward force of the injection molding machine ejector rod to eject the mold cavity 300 and the main runner 1002.

The invention discloses a blood taking needle injection molding process, which is carried out based on the injection mold and comprises the following steps:

s1: prefabricating, prefabricating the needle body and the injection mold.

S2: and (5) placing the needle body 1 on the needle frame 400 of the injection mold in the step (S1), wherein the needle body 1 is positioned on the V-shaped top end of the needle frame 400.

S3: and (3) closing the mold, closing the upper mold 200 and the lower mold 100 and tightly pressing the needle pressing rod 500 and the needle frame 400, wherein the magnet frame 600 adsorbs the needle body 1, and the needle body 1 in the middle of the needle frame 400 is tightly pressed by the needle pressing rod 500 and the needle frame 400, so that the needle body 1 is prevented from moving in the glue injection process.

S4: and (3) feeding glue, namely, injecting a plastic melt from a nozzle 1001 of the glue injection machine, allowing the plastic melt to pass through a main runner 1002 and a glue feeding port 1003 and then enter the mold cavity 300 from the tail end of the needle handle cavity 3002 until the whole mold cavity 300 is filled with the plastic melt, sealing and molding, wherein the glue feeding direction is a latent glue feeding direction, and the included angle between the glue feeding port 1003 and the needle body 1 in the horizontal direction is 20-85 degrees, so that the glue feeding port 1003 inclines downwards and injects the glue into the mold cavity 300.

S5: opening the mold, taking out the molded blood taking needle from the mold after cooling molding and packaging the blood taking needle into a blood taking needle finished product, taking out the blood taking needle from the mold is realized by upward movement of a product ejector rod 1005 and a runner ejector rod 1004 in a lower mold 100, when the product ejector rod 1005 and the runner ejector rod 1004 move upward through an ejection rod 700 of an injection molding machine on the injection molding machine, the product ejector rod 1005 holds up the molded blood taking needle and the runner ejector rod 1004 holds up the injection molded colloid in a main runner 1002 to move upward, and simultaneously, as shown in fig. 4, the joining point of a glue inlet 1003 and the tail end of a mold cavity 300 forms a preset included angle a, and the joining point of the glue inlet 1003 and a needle handle cavity 3002 is arranged deviating from a needle body 1, and is the point with the smallest inner diameter of the glue inlet, and a solid mold is arranged between the joining point and the tail end of the needle handle cavity 3002, when the product ejector rod 1005 and the molded blood taking needle 1004 hold up and the, the die above the joining point is relatively sharp, so that the joining point is easily cut off and separated when the blood taking needle moves upwards, and secondary cutting after demoulding is avoided.

As shown in figure 4, the injection type blood taking needle formed by injection molding through the injection mold through the injection molding process comprises a needle body 1 with a needle point 101, a needle handle 2 and a needle cap 3, wherein the needle body 1 is fixed in the needle handle 2, the needle point 101 extends out of 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 of an integral injection molding structure, and one end of the needle body 1, which is far away from the needle point 101, is in seamless contact with the tail end of the needle handle 2.

At least one needle pressing point groove 201 is arranged on one side of the needle body 1 in the needle handle 2, at least two needle frame grooves 202 are arranged on the other side of the needle body 1, and the needle pressing point groove 201 and the needle frame grooves 202 are communicated with the inside of the needle handle 2.

The number of the needle pressing point grooves 201 is equal to that of the needle frame grooves 202, and each needle pressing point groove 201 is 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 2, and the needle pressing point grooves and the needle frame grooves are respectively distributed at the front end and the rear end of the needle handle 2. A magnet holder groove 203 is also arranged at the lower end of the needle handle 2. The outer circumference of the middle part of the needle handle 2 is also provided with a reinforcing rib 5, and the reinforcing rib 5 is arranged at the position of the magnet frame groove 203 and is arranged along the outer circumference of the needle handle 2 of the magnet frame groove 203.

The one end that is close to needle cap 3 at needle handle 2 still is equipped with spacing piece 6, and spacing piece 6 place plane is perpendicular with needle body 1 place straight line, and when the blood taking needle used, the spacing piece can guarantee that the blood taking needle pricks skin perpendicularly when pricking skin, prevents the crooked increase of bringing of pain sense of blood taking needle.

The axial cross section of the needle handle 2 is trapezoidal, the outer diameter of one end of the needle handle close to the needle cap 3 is smaller than that of the other end of the needle handle far away from the needle cap 3, and 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 material.

When injection moulding, select from 2 terminal injecting glue of needle handle to use formula injecting glue modes of hiding, advance to glue mouthful and be located 2 terminal of needle handle, and the certain angle of slope advances to glue, reduces the impact force to needle body 1, and 1 terminal and 2 terminal seamless contact of needle handle of needle body 1, 2 terminal hollow structure not of needle handle, and when using, the needle body 1 directly pushes up at 2 terminal of needle handle, the condition that the needle body slightly removed can not appear.

The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

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.