Needle making tool

Abstract

The present invention belongs to the field of assembling needles of medical pen-type syringes, and provides a needle upper tool, comprising a needle seat fixing pin with an upper opening for fixing a needle seat, the needle seat being sleeved on the upper end of the outer wall of the needle seat fixing pin, the outer diameter of the upper end of the outer wall of the needle seat fixing pin being smaller than the inner diameter of the inner cavity of the needle seat, the lower end of the outer wall of the needle seat fixing pin being mounted on a tooling strip, a needle fixing pin of a columnar structure being arranged in the inner cavity of the needle seat fixing pin, a positioning groove being arranged at the center of the upper end of the needle fixing pin, a limiting member being connected to the bottom of the needle fixing pin for preventing the needle fixing pin from falling off from the inner cavity of the needle seat fixing pin, the needle fixing pin and the positioning groove being coaxially arranged with the axis of the needle seat fixing pin, and the beneficial effects of the present invention are that the skewness and height of the upper needle are guaranteed, and the needle fixing pin is not easy to fall off.

Description

Technical Field

[0001] The invention relates to the field of assembling needles of medical pen-type syringes, in particular to a needle assembly tool. Background Art

[0002] When using a pen-type syringe needle, the needle seat needs to be screwed onto the injection pen so that the needle tube penetrates the rubber diaphragm to form a syringe. If the concentricity of the needle tube and the needle seat is not good, the needle tube will break or even break during the screwing process. Therefore, the concentricity of the needle tube and the needle seat is very high. The needle tube and the needle seat are glued together at the needle seat hole with adhesive. If the concentricity of the needle tube and the needle seat is not controlled, there will be problems such as skewness and uneven needle height. In addition, the limiter of the needle fixing pin used to fix the lower end of the needle tube is easy to fall off after a period of use. Summary of the invention

[0003] The purpose of the present invention is to provide a needle-loading tool which has a simple structure, is easy to operate, and can ensure that the needle of a pen-type syringe needle is tilted, the needle is raised to a high height, and a limiting piece is not easy to fall off.

[0004] The technical solution of the present invention is: an upper needle making tool, comprising a needle seat fixing pin with an upper opening for fixing the needle seat, a through hole allowing the needle tube to pass through is provided on the central axis of the needle seat and on the top cover that passes through the needle seat, the needle seat is sleeved on the upper end of the outer wall of the needle seat fixing pin, the outer diameter of the upper end of the outer wall of the needle seat fixing pin is smaller than the inner diameter of the inner cavity of the needle seat, the lower end of the outer wall of the needle seat fixing pin is installed on the tooling strip, matching with a single workstation in the tooling strip, and a needle fixing pin with a columnar structure is provided in the inner cavity of the needle seat fixing pin Pin, the needle fixing pin and the corresponding installation positions in the inner cavity of the needle seat fixing pin are limited by the inner cavity diameter being smaller than the needle fixing pin, a positioning groove is provided in the center of the upper end of the needle fixing pin for accommodating the lower end of the needle tube, and a limiting member is connected to the bottom of the needle fixing pin in the inner cavity of the needle seat fixing pin for limiting the position of the needle fixing pin on the needle seat fixing pin to prevent the needle fixing pin from falling off from the inner cavity of the needle seat fixing pin, and the needle fixing pin and the positioning groove are coaxially arranged with the axis of the needle seat fixing pin.

[0005] The limiting member includes a first screw abutting against the lower end surface of the needle fixing pin, and a second screw located below the first screw, and the first screw and the second screw are connected by bolts.

[0006] The first screw, the second screw and the bolt are coaxially arranged with the axis of the needle seat fixing pin, and a gap is left between the first screw and the second screw.

[0007] The contact surface between the first screw and the needle fixing pin is a plane, and a first threaded hole connected to the bolt is provided on an axis of one side of the first screw close to the second screw, and an internal thread matching the external thread of the bolt is provided in the first threaded hole, and a second threaded hole is provided in the second screw, and the second threaded hole is a through hole extending from top to bottom, allowing the bolt to pass through the second screw in a threaded manner.

[0008] The upper end of the outer wall of the needle seat fixing pin on which the needle seat is sleeved is the first cylinder as a whole and the upper end of the second cylinder, the outer wall of the first cylinder is connected to the threaded area of ​​the inner wall of the needle seat, the upper outer wall of the second cylinder is used to connect with the inner cavity wall below the inner thread of the needle seat inner cavity, for positioning and fixing the needle seat, the lower end of the outer wall of the needle seat fixing pin is a third cylinder installed on the tooling strip, matching a single workstation in the tooling strip.

[0009] The outer wall of the third cylinder matches a single installation station in the tooling strip, a protruding limiting portion is provided on the needle fixing pin, and the protruding limiting portion of the needle fixing pin is a boss, and the boss is used to limit the needle fixing pin, and the inner cavity of the needle seat fixing pin at the installation position of the needle fixing pin and the limiting member in the needle seat fixing pin matches the needle fixing pin and the limiting member, and a guide groove is provided in the center of the upper end of the needle fixing pin, and the guide groove is a frustum that is wide at the top and narrow at the bottom, and is used to guide the lower end of the needle tube to the positioning groove on the axis of the needle seat fixing pin.

[0010] In order to facilitate the needle tube to enter the positioning groove, the upper end opening of the positioning groove is provided with a chamfer, and the chamfer is distributed along the circumference of the upper end opening of the positioning groove.

[0011] The inner wall of the positioning groove fits the outer wall of the needle tube, allowing the lower end of the needle tube to slide freely axially along the inner wall of the positioning groove.

[0012] To facilitate installation, chamfers are provided on the upper ends of the first cylinder and the second cylinder.

[0013] The outer circumferential diameter of the upper end portion of the second cylinder is larger than the diameter of the first cylinder.

[0014] The advantages and positive effects of the present invention are as follows: due to the adoption of the above technical scheme, the lower end of the needle seat fixing pin is connected to the tooling strip, and the upper end is connected to the needle seat; the first screw, the second screw and the bolt are coaxially arranged with the axis of the needle seat fixing pin; a gap is left between the first screw and the second screw, and the gap will cause internal stress to be formed between the first screw and the second screw, which is not easy to fall off; the cylindrical positioning groove of the needle fixing pin can better ensure the skewness of the upper needle than other shapes such as a cone; the height of the needle tube can also be limited by the positioning groove, so that the installation height of the needle tube is unified, the upper needle height, and the upper needle skewness control effect are good; the needle seat fixing pin connects and positions the needle seat; the positioning groove of the needle fixing pin uses the principle of two points determining a straight line; the positioning groove of the needle fixing pin and the through hole through which the needle tube passes through the needle seat ensure the skewness and height of the upper needle, and the upper needle skewness control effect is good; the design of the guide groove can better facilitate the lowering of the needle, so that the lower end of the needle tube can be quickly lowered into the positioning groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the needle fixing pin structure in the specific embodiment 1 of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the upper needle making tool of the specific embodiment 1 of the present invention;

[0017] Figure 3 AA is a schematic diagram of the cross-sectional structure of the upper needle making tool of the specific embodiment 1 of the present invention;

[0018] Figure 4 Schematic diagram of the use of the upper needle making tool of the specific embodiment 1 of the present invention on the tooling strip;

[0019] Figure 5 It is a structural schematic diagram of the upper needle making tool of the specific embodiment 1 of the present invention on the tooling bar at the AA section and the enlarged surface of the AA section.

[0020] In the figure:

[0021] 1. needle seat, 2. needle tube, 3. needle seat fixing pin, 4. needle fixing pin, 5. guide groove, 6. positioning groove, 7. limiter, 71. first screw, 72. bolt, 73. second screw, 8. tooling strip. DETAILED DESCRIPTION

[0022] Specific embodiment 1: Figure 1-5, a needle upper making tool, used to install the needle tube into the through hole at the center of the corresponding needle seat, and to ensure the skewness and uniform height of the upper needle, including a needle seat fixing pin 3 with an upper opening for fixing the needle seat 1, a through hole allowing the needle tube 2 to pass through is provided on the central axis of the needle seat 1 and on the top cover that passes through the needle seat 1, the inner diameter of the through hole is slightly larger than the outer diameter of the needle tube 2, allowing the needle tube 2 to slide up and down in the through hole without obstacles, the outer side wall of the needle seat fixing pin 3 of the hollow columnar body is composed of at least three cylinders of diameters, which are a first cylinder, a second cylinder and a third cylinder from top to bottom, such as Figure 2 In this specific embodiment, the outer wall of the needle seat fixing pin 3 is composed of three diameter cylinders. The outer wall of the first cylinder is connected to the inner wall of the needle seat 1. The upper outer wall of the second cylinder is used to fit tightly with the smooth inner cavity wall below the inner thread of the inner cavity of the needle seat 1 to fix the needle seat 1. The outer wall of the third cylinder matches a single installation station in the tooling strip 8 to install the needle seat fixing pin 3 on the tooling strip 8. The inner cavity of the needle seat fixing pin 3 is provided with a needle fixing pin of a column structure. The pin 4 is used to limit and fix the lower end of the needle tube 2 to ensure the skewness of the upper needle and the installation height of the needle tube 2. The needle fixing pin 4 and the needle tube 2 are coaxially arranged. The needle fixing pin 4 is provided with a protruding limiting portion for limiting the needle fixing pin 4. The protruding limiting portion of the needle fixing pin 4 is a boss. The needle fixing pin 4 has two stepped cylindrical layers. The diameter of the cylinder of the boss located at the lower layer is larger than that of the cylinder of the upper layer. The axes of the two truncated cones are coaxially arranged, and the stepped shape is used to limit the upper installation position of the needle fixing seat 4. A cylindrical positioning groove 6 is provided in the center of the upper end of the needle fixing pin 4 to accommodate the lower end of the needle tube 2 to limit the installation position of the needle tube 2. The positioning groove 6 and the axis of the needle tube 2 are coaxially arranged.

[0023] A positioning groove 6 is provided in the center of the upper end of the needle fixing pin 4 for accommodating the lower end of the needle tube 2. A limiting member 7 is connected to the bottom of the needle fixing pin 4 in the inner cavity of the needle seat fixing pin 3 for limiting the position of the needle fixing pin 4 in the needle seat fixing pin 3 to prevent the needle fixing pin 4 from falling off from the inner cavity of the needle seat fixing pin 3. The first cylinder, the second cylinder, the third cylinder, the needle fixing pin 4, the guide groove 5, and the positioning groove 6 are all coaxially arranged with the axis of the needle seat fixing pin 3.

[0024] The limiting member 7 includes a first screw 71 abutting against the lower end surface of the needle fixing pin 4 and a second screw 73 located below the first screw 71 . The first screw 71 and the second screw 73 are connected by a bolt 72 .

[0025] The first screw 71, the second screw 73 and the bolt 72 are coaxially arranged with the axis of the needle seat fixing pin 3, and a gap is left between the first screw 71 and the second screw 72. The gap can form internal stress between the first screw 71 and the second screw 72 to prevent them from falling off.

[0026] The contact surface between the first screw 71 and the needle fixing pin 4 is a plane, and the outer wall of the first screw 71 has an external thread. A corresponding internal thread is provided in the installation position of the first screw 71 in the inner cavity of the needle seat fixing pin 3. A first threaded hole connected to the bolt 72 is provided on the axis of one side of the first screw 71 close to the second screw 73. The bolt 72 is a tensioning bolt, and an internal thread matching the external thread of the bolt 72 is provided in the first threaded hole. The second screw 73 is a tensioning screw with a second threaded hole provided therein. The second threaded hole is a through hole extending from top to bottom, allowing the bolt 72 to penetrate the second screw 73 in a threaded manner. The contact surface between the first screw 71 and the needle fixing pin 4 is a plane, and the contact surface of the plane is to prevent the needle fixing pin 4 from falling off. The contact surface of the plane can bear force more steadily, so it is easy for technicians in this field to think that the first screw 71 can also use a threaded through hole with an internal thread. During actual installation and use, the bolt 72 should not be exposed from the upper plane of the first screw 71, because the horizontal cross-sectional area of ​​the bolt 72 is small, and the effect of abutting against the needle fixing seat 4 is not very ideal.

[0027] The inner cavity of the installation position of the needle fixing pin 4 and the limiting member 7 of the needle seat fixing pin 3 in the needle seat fixing pin 3 matches the needle fixing pin 4 and the limiting member 7, and a guide groove 5 is provided in the center of the upper end of the needle fixing pin 4. The guide groove 5 is a frustum that is wide at the top and narrow at the bottom, and is used to guide the lower end of the needle tube 2 to the positioning groove 6 on the axis of the needle seat fixing pin 3.

[0028] In order to facilitate the needle tube 2 to enter the positioning groove 6 , the upper opening of the positioning groove 6 is provided with a chamfer, and the chamfer is distributed along the circumference of the upper opening of the positioning groove 6 .

[0029] The inner wall of the positioning groove 6 fits the outer wall of the needle tube 2 or is slightly larger than the outer wall of the needle tube 2, allowing the lower end of the needle tube 2 to slide freely axially along the inner wall of the positioning groove 6. The difference between the diameter of the positioning groove 6 and the outer wall diameter of the needle tube 2 is greater than 0 and less than or equal to 6 mm, and 1 mm is equal to 0.01 mm, which is a commonly used non-legal measurement unit. The diameter of the positioning groove 6 is a key factor in controlling the effect of needle skewness, which depends on the diameter of the positioning groove 6. If the diameter of the positioning groove 6 is too large, the needle skewness is too large, the product is unqualified or affects the use. If the diameter of the positioning groove 6 is too small, it is difficult to insert the needle, that is, it is difficult for the needle tube 2 to enter the positioning groove 6. It is a necessary condition that the diameter of the positioning groove 6 is greater than the diameter of the outer wall of the needle tube 2. The depth of the positioning groove 6 is related to the total length of the needle tube 2, the length of the use part of the needle tube 2 required to be reserved outside the needle seat 1, and the required length of the needle tube 2 in the syringe, and can be different according to actual conditions. The installation test of the disposable pen injection needle shows that the needle tube can be preferably positioned and the whole device is simple to process. The depth of the positioning groove is 1.1mm to 1.7mm. The upper and lower ends of the needle tube 2 are sharp side bevels. The closer to the end, the smaller the cross-sectional area of ​​the needle tube 2. Therefore, the depth of the positioning groove 6 is too small to play a good positioning role. The needle tube 2 is still easy to tilt. The depth of the positioning groove 6 is 1.1mm to 1.7mm, which can install the needle tube 2 on the needle seat 1 within a small left and right deviation, meeting national standards and industry standards.

[0030] An opening is left at the center of the upper end of the needle seat locating pin 3 and the upper end of the locating groove 6. After the needle seat 2 is installed on the needle seat fixing pin 3, the opening will form a cavity to ensure that the needle tube 2 can smoothly reach the locating groove 6. In this specific embodiment, the upward limit in the inner cavity of the needle seat fixing pin 3 is achieved by clamping the top surface of the boss provided under the needle fixing pin 4 and the inner cavity of the needle seat fixing pin 3 corresponding to the boss, thereby limiting the needle fixing pin 4 from continuing to move upward. Therefore, the size of the cavity in this specific embodiment is larger than the size of the upper end of the needle fixing pin, and the cavity above the locating groove does not play any blocking and limiting role on the upper end of the needle seat fixing pin. In this way, there is no need to clamp the upper end of the needle seat fixing pin 4 for limiting, and the structure is simple. Figure 2 and Figure 3 As shown, the diameter of the cavity in this specific embodiment is consistent with the diameter of the installation operation space at the lower end of the needle seat fixing pin 3.

[0031] To facilitate installation, chamfers are provided on the upper ends of the first cylinder and the second cylinder.

[0032] The outer circumferential diameter of the upper end portion of the second cylinder is larger than the diameter of the first cylinder.

[0033] The needle fixing pin 4 and the limiting member 7 are inserted into corresponding positions in the inner cavity of the needle seat fixing pin 3 from the lower end opening of the needle seat fixing pin.

[0034] When in use, the limit member 7 is assembled externally and installed in the inner cavity of the needle seat fixing pin 3 after assembly. The limit member 7 is assembled externally by first screwing the second screw 73 from the upper end of the bolt 72 to the bottom end of the bolt 72, and then installing the first screw on the bolt, leaving a gap between the first screw 71 and the second screw 73. After assembly, the assembled limit member 7 is placed at the lower end of the needle seat fixing pin 3 and pushed upward. After encountering resistance, screw the bolt 72 to make the external thread of the first screw 71 threadably connected with the internal thread at the corresponding position in the inner cavity of the needle seat fixing pin 3 until the top surface of the first thread 71 abuts against the bottom surface of the needle fixing pin 4. The needle fixing pin 4 and the limiting member 7 are sequentially placed into the needle seat fixing pin 3 from the lower opening of the needle seat fixing pin 3. The limiting portion protruding from the needle fixing pin 4 is a boss. When the needle fixing pin 4 reaches the corresponding installation position in the inner cavity of the needle seat fixing pin 3, the boss limits the needle fixing pin 4 so that it cannot continue to move upward. The limiting member 7 is at the lower end of the needle fixing pin 4 to prevent the needle fixing pin 4 from falling off from the inner cavity of the needle seat fixing pin 3. When installing the needle tube, the needle seat 1 is threadedly connected to the upper end of the needle seat fixing pin 3. The needle tube 2 passes through the through hole provided on the top cover of the needle seat 1 and through the central axis of the needle seat 1 for the needle tube 2 to pass through. Through the guiding effect of the guide groove 5, it quickly enters the cylindrical positioning groove 6, and the installation of a single needle tube and needle seat is completed. A number of upper needle making tools can be placed on the tooling strip 8 to complete the assembly line operation of the needle tube and needle seat installation.

[0035] Specific embodiment 2: The only difference between specific embodiment 2 and specific embodiment 1 is that the guide groove 5 is cancelled. In order to facilitate the needle tube 2 to enter the positioning groove 6, the upper end opening of the positioning groove 6 is provided with a chamfer, and the chamfer is distributed along the circumference of the upper end opening of the positioning groove 6.

[0036] The inner wall of the positioning groove 6 fits the outer wall of the needle tube 2 , allowing the lower end of the needle tube 2 to slide freely axially along the inner wall of the positioning groove 6 .

[0037] Specific embodiment 3: The only difference from specific embodiment 1 is that the difference between the diameter of the positioning groove 6 and the outer wall diameter of the needle tube 2 is 5 mm.

[0038] The above three embodiments of the present invention are described in detail, but the above contents are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A needle making tool, characterized in that: The needle seat fixing pin comprises an upper opening for fixing the needle seat, a top cover on the central axis of the needle seat and penetrating the needle seat is provided with a through hole allowing the needle tube to pass through, the needle seat is sleeved on the upper end of the outer wall of the needle seat fixing pin, the outer diameter of the upper end of the outer wall of the needle seat fixing pin is smaller than the inner diameter of the inner cavity of the needle seat, the lower end of the outer wall of the needle seat fixing pin is installed on the tooling strip to match a single workstation in the tooling strip, the inner cavity of the needle seat fixing pin is provided with a needle fixing pin of a columnar structure, the needle fixing pin and the corresponding installation position in the inner cavity of the needle seat fixing pin are limited by the inner cavity diameter being smaller than the needle fixing pin, a positioning groove is provided in the center of the upper end of the needle fixing pin for accommodating the lower end of the needle tube, and the bottom of the needle fixing pin in the inner cavity of the needle seat fixing pin is connected to a limiting member for limiting the position of the needle fixing pin on the needle seat fixing pin to prevent the needle fixing pin from being moved away from the needle seat fixing pin The inner cavity of the needle seat fixing pin falls off, and the needle fixing pin and the positioning groove are coaxially arranged with the axis of the needle seat fixing pin; the upper end of the outer wall of the needle seat fixing pin on which the needle seat is sleeved is the first cylindrical body as a whole and the upper end of the second cylinder, and the lower end of the outer wall of the needle seat fixing pin is a third cylinder; the outer wall of the third cylinder matches a single installation station in the tooling strip, and a protruding limiting portion is provided on the needle fixing pin, and the protruding limiting portion of the needle fixing pin is a boss, and the boss is used to limit the needle fixing pin, and the inner cavity of the needle seat fixing pin at the installation position of the needle fixing pin and the limiting member in the needle seat fixing pin matches the needle fixing pin and the limiting member, and a guide groove is provided in the center of the upper end of the needle fixing pin, and the guide groove is a round cone with a wide top and a narrow bottom, which is used to guide the lower end of the needle tube to the positioning groove on the axis of the needle seat fixing pin.

2. The needle making tool according to claim 1, characterized in that: The limiting member includes a first screw abutting against the lower end surface of the needle fixing pin, and a second screw located below the first screw, and the first screw and the second screw are connected by bolts.

3. The needle making tool according to claim 2, characterized in that: The first screw, the second screw and the bolt are coaxially arranged with the axis of the needle seat fixing pin, and a gap is left between the first screw and the second screw.

4. The needle making tool according to claim 3, characterized in that: The contact surface between the first screw and the needle fixing pin is a plane, and a first threaded hole connected to the bolt is provided on an axis of one side of the first screw close to the second screw, and an internal thread matching the external thread of the bolt is provided in the first threaded hole, and a second threaded hole is provided in the second screw, and the second threaded hole is a through hole extending from top to bottom, allowing the bolt to pass through the second screw in a threaded manner.

5. The needle making tool according to claim 4, characterized in that: The outer wall of the first cylinder is connected to the threaded area of ​​the inner wall of the needle seat, the upper outer wall of the second cylinder is used to connect to the inner wall of the needle seat below the inner thread of the inner cavity, and is used to position and fix the needle seat. The third cylinder is installed on the tooling bar to match a single workstation in the tooling bar.

6. The needle making tool according to claim 1, characterized in that: In order to facilitate the needle tube to enter the positioning groove, the upper end opening of the positioning groove is provided with a chamfer, and the chamfer is distributed along the circumference of the upper end opening of the positioning groove.

7. A needle making tool according to any one of claims 1 to 6, characterized in that: The inner wall of the positioning groove fits the outer wall of the needle tube, allowing the lower end of the needle tube to slide freely axially along the inner wall of the positioning groove.

8. The needle making tool according to claim 7, characterized in that: To facilitate installation, chamfers are provided on the upper ends of the first cylinder and the second cylinder.

9. The needle making tool according to claim 8, characterized in that: The outer circumferential diameter of the upper end portion of the second cylinder is larger than the diameter of the first cylinder.

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