Injection molding integrated needle mold

Abstract

The utility model relates to the related field of molds, in particular to an injection molding integrated needle mold which comprises a lower mold plate, an upper mold plate, a lower mold cavity, an upper mold cavity, a pouring gate, a positioning rod, a positioning cylinder, a sliding rod, a guide cavity, a sliding plate, a spring, an ejector pin, a ball and the like. By arranging the sliding rod with the top end face higher than the ejector pin, before the upper mold plate and the lower mold plate are closed, the upper mold plate firstly drives the positioning rod to be inserted into the positioning cylinder, the positioning rod extrudes the sliding rod to move downwards when entering the inner side of the positioning cylinder, and the sliding rod drives the sliding plate and the ejector pin to move downwards; the ejector pin is completely contracted at the bottom of the lower die cavity before the upper die plate and the lower die plate are closed, so that the ejector pin is prevented from colliding with the upper die plate to be damaged when the upper die plate and the lower die plate are closed, and economic loss caused by damage of the ejector pin is reduced.

Description

Technical Field

[0001] This utility model relates to the field of molds, and in particular to an integrated injection pin mold. Background Technology

[0002] Integrated needles manufactured through injection molding typically refer to medical needles made of plastic materials using injection molding technology. These products are widely used in the medical device field, especially for medical devices that require single use. Integrated needles manufactured through injection molding help maintain a high degree of consistency in quality and appearance in each production run, which helps improve the reliability of the final product and user satisfaction. Furthermore, the injection molding process is fast and suitable for large-scale continuous production, which can meet the market demand for integrated needles.

[0003] After the existing one-piece injection molding is completed in the mold, ejector pins are usually set in the mold to facilitate product removal. The ejector pins are usually located at the bottom of the lower mold cavity. However, before the upper and lower mold plates are closed, the ejector pins are higher than the lower mold cavity. This can easily cause the ejector pins to collide with the upper mold plate and be damaged when the upper and lower mold plates are closed, which may result in economic losses. Summary of the Invention

[0004] Therefore, in order to overcome the above-mentioned shortcomings, this utility model provides an integrated injection molding needle mold to solve the above-mentioned technical problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an integrated injection mold for a needle, comprising a lower mold plate, an upper mold plate disposed on the lower mold plate, and a lower mold cavity opened on the top surface of the lower mold plate. The bottom surface of the upper mold plate is provided with an upper mold cavity corresponding to the lower mold cavity, and the top surface of the upper mold plate is provided with a gate communicating with the upper mold cavity. The lower mold cavity and the upper mold cavity are combined to form a molding chamber for an integrated needle. Several positioning rods are installed at the bottom edge of the upper mold plate, and several positioning cylinders corresponding to the positioning rods are embedded in the top of the lower mold cavity. The interior of the lower mold cavity is provided with a guide cavity communicating with the inner side of the positioning cylinder.

[0006] The positioning rod is inserted into the positioning cylinder, and after the positioning rod extends into the inside of the positioning cylinder, it is in contact with the sliding rod that is slidably installed inside the positioning cylinder. After the sliding rod passes through the bottom inside the positioning cylinder, it is connected to the sliding plate that is slidably installed inside the guide cavity. The sliding plate is connected to the bottom inside the guide cavity by a spring, and an ejector pin is installed at the top of the sliding plate away from the sliding rod. After the ejector pin moves through the top inside the guide cavity, it extends into the inside of the lower mold cavity.

[0007] The top surface of the slide bar is higher than the top surface of the ejector pin.

[0008] Preferably, the top of the positioning cylinder is provided with an expansion cylinder, which gradually narrows from top to bottom, and the bottom inner side of the expansion cylinder is connected to the inner wall of the expansion cylinder.

[0009] Preferably, the outer diameter of the slide rod is smaller than the inner diameter of the positioning cylinder, and several rows of balls that are movably embedded in the positioning cylinder and are tactilely connected to the slide rod are distributed at the bottom of the positioning rod.

[0010] Preferably, the side surface of the slide bar is provided with a plurality of guide grooves, and the inner side of the guide grooves is in rolling connection with the ball bearings.

[0011] Preferably, the slide bar and the ejector pin are both perpendicular to the top of the slide plate, and when the lower mold plate and the upper mold plate are fully closed, the top surface of the ejector pin is flush with the bottom of the inner side of the lower mold cavity.

[0012] The beneficial effects of this utility model are:

[0013] This invention features a sliding rod with its top surface higher than the ejector pin. Before the upper and lower mold plates are closed, the upper mold plate first drives the positioning rod to insert into the positioning cylinder. When the positioning rod enters the inner side of the positioning cylinder, it presses the sliding rod downward. The sliding rod drives the sliding plate and the ejector pin downward, so that the ejector pin is completely retracted at the bottom of the lower mold cavity before the upper and lower mold plates are closed. This prevents the ejector pin from colliding with the upper mold plate and being damaged when the upper and lower mold plates are closed, thus reducing economic losses caused by ejector pin damage. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the upper and lower templates in the closed state of this utility model.

[0015] Figure 2 This is a top view schematic diagram of the sliding rod connection structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the positioning cylinder structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the upper template structure from below.

[0018] Among them: lower mold plate-1, upper mold plate-2, lower mold cavity-3, upper mold cavity-4, gate-5, positioning rod-6, positioning cylinder-7, slide rod-8, guide cavity-9, slide plate-10, spring-11, ejector pin-12, ball-bearing device-13, guide groove-14, expansion cylinder-15. Detailed Implementation

[0019] To further explain the technical solution of this utility model, a detailed description is provided below through specific embodiments.

[0020] like Figure 1As shown, this utility model provides an integrated injection molding needle mold, including a lower mold plate 1, an upper mold plate 2 disposed above the lower mold plate 1, a lower mold cavity 3 opened on the top surface of the lower mold plate 1, an upper mold cavity 4 corresponding to the lower mold cavity 3 opened on the bottom surface of the upper mold plate 2, and a gate 5 for introducing molten material through the upper mold cavity 4 opened on the top surface of the upper mold plate 2. The lower mold cavity 3 and the upper mold cavity 4 are combined to form the molding chamber of an integrated needle.

[0021] like Figures 1 to 4 As shown, in this embodiment, a positioning rod 6 is vertically installed at each of the four bottom ends of the upper mold 2, and a positioning cylinder 7 corresponding to each of the four top ends of the lower mold cavity 3 is fixedly embedded. A guide cavity 9 communicating with the inner side of the positioning cylinder 7 is provided inside the lower mold cavity 3.

[0022] The four positioning rods 6 are inserted into the four positioning cylinders 7 one by one, and after the positioning rods 6 extend into the inside of the positioning cylinders 7, they are in contact with the sliding rods 8 that are slidably installed inside the positioning cylinders 7. After the sliding rods 8 pass through the bottom inside the positioning cylinders 7, they are connected to the sliding plate 10 that is slidably installed inside the guide cavity 9.

[0023] The slide plate 10 is connected to the inner bottom of the guide cavity 9 by the spring 11, so that the slide plate 10 can be moved upward and reset by the elastic force of the spring 11. The top of the slide plate 10 away from the slide rod 8 is equipped with an ejector pin 12. The ejector pin 12 moves through the inner top of the guide cavity 9 and then moves into the inner side of the lower mold cavity 3. The ejector pin 12 is used to push the injection-molded integral pin upward and away from the inner side of the lower mold cavity 3.

[0024] The top surface of the slide bar 8 is higher than the top surface of the ejector pin 12, which makes it easier for the positioning rod 6 to contact the slide bar 8 more quickly and drive the ejector pin 12 to move downward.

[0025] Among them, the slide bar 8 and the ejector pin 12 are both perpendicular to the top of the slide plate 10, and when the lower mold plate 1 and the upper mold plate 2 are fully closed, the top surface of the ejector pin 12 is flush with the bottom of the inner side of the lower mold cavity 3.

[0026] In this embodiment, the top of the positioning cylinder 7 is provided with an expansion cylinder 15. The expansion cylinder 15 gradually narrows from top to bottom, and the bottom of the inner side of the expansion cylinder 15 is connected to the inner wall of the expansion cylinder 15, so that the positioning rod 6 can quickly pass through the expansion cylinder 15 and enter the positioning cylinder 7.

[0027] In this embodiment, the outer diameter of the slide rod 8 is smaller than the inner diameter of the positioning cylinder 7. Several rows of balls 13 that are movably embedded in the positioning cylinder 7 are connected to the slide rod 8 in a rolling manner. The balls 13 are all distributed at the bottom of the positioning rod 6. The multiple rows of balls 13 provide positioning for the slide rod 8, reducing the friction force of the slide rod 8 directly contacting the inner wall of the positioning cylinder 7, and making it easier for the slide rod 8 to move up and down more quickly.

[0028] Among them, the side surface of the slide bar 8 is provided with several guide grooves 14, and the inner side of the guide grooves 14 is rolledly connected with the ball 13. The ball 13 cooperates with the guide grooves 14 to provide positioning for the slide bar 8, thereby improving the stability of the slide bar 8 during the up and down movement.

[0029] Specifically, in use, the upper template 2 is placed on the lower template 1 along with the positioning rod 6, and each positioning rod 6 is inserted into the positioning cylinder 7. The positioning rod 6 and the positioning cylinder 7 provide positioning for the upper template 2, reducing the offset of the upper template 2. When the upper template 2 moves the positioning rod 6 downward, the positioning rod 6 pushes the slide rod 8 downward. The slide rod 8 moves the slide plate 10 and the ejector pin 12 downward. The spring 11 is compressed by the pressure of the slide plate 10. When the slide rod 8 continues to move downward, the ejector pin 12 continues to move downward, so that the ejector pin 12 is placed at the bottom of the lower mold cavity 4 before the upper template 2 and the lower mold cavity 3 are closed.

[0030] After the upper mold plate 2 and the lower mold cavity 3 are closed, the molten material for producing the integrated pin enters the cavity formed by the upper mold cavity 4 and the lower mold cavity 3 through the gate 5. The molten material cools in the upper mold cavity 4 and the lower mold cavity 3 to form the integrated pin product. Then, the upper mold plate 2 is pulled upward to drive the positioning rod 6 to disengage from the positioning cylinder 7. At this time, the slide rod 8, the slide plate 10 and the ejector pin 12 move upward under the elastic force of the spring 11. The ejector pin 12 moves upward to push out the integrated pin product in the lower mold cavity 4, completing the injection molding process of the integrated pin.

[0031] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An injection mold for an integrated needle, comprising a lower mold plate, an upper mold plate disposed on the lower mold plate, and a lower mold cavity opened on the top surface of the lower mold plate, wherein the bottom surface of the upper mold plate is provided with an upper mold cavity corresponding to the lower mold cavity, and the top surface of the upper mold plate is provided with a gate communicating with the upper mold cavity, wherein the lower mold cavity and the upper mold cavity are combined to form a molding chamber for an integrated needle. Its features are, Several positioning rods are installed at the bottom edge of the upper template, and several positioning cylinders corresponding to the positioning rods are embedded in the top of the lower mold cavity. A guide cavity communicating with the inner side of the positioning cylinder is opened inside the lower mold cavity. The positioning rod is inserted into the positioning cylinder, and after the positioning rod extends into the inside of the positioning cylinder, it is in contact with the sliding rod that is slidably installed inside the positioning cylinder. After the sliding rod passes through the bottom inside the positioning cylinder, it is connected to the sliding plate that is slidably installed inside the guide cavity. The sliding plate is connected to the bottom inside the guide cavity by a spring, and an ejector pin is installed at the top of the sliding plate away from the sliding rod. After the ejector pin moves through the top inside the guide cavity, it extends into the inside of the lower mold cavity. The top surface of the slide bar is higher than the top surface of the ejector pin.

2. The injection molded integrated needle mold according to claim 1, characterized in that: The top of the positioning cylinder is provided with an expansion cylinder, which gradually narrows from top to bottom, and the bottom inner side of the expansion cylinder is connected to the inner wall of the expansion cylinder.

3. The one-piece injection molding needle mold according to claim 1, characterized in that: The outer diameter of the slide rod is smaller than the inner diameter of the positioning cylinder. Several rows of balls are movably embedded in the positioning cylinder and are tactilely connected to the slide rod, with the balls distributed at the bottom of the positioning rod.

4. The injection molded integrated needle mold according to claim 3, characterized in that: The side surface of the slide bar is provided with several guide grooves, and the inner side of the guide grooves is in rolling connection with the ball bearings.

5. The one-piece injection molding needle mold according to claim 1, characterized in that: Both the slide bar and the ejector pin are perpendicular to the top of the slide plate, and when the lower mold plate and the upper mold plate are fully closed, the top surface of the ejector pin is flush with the bottom of the inner side of the lower mold cavity.

Images