Medical rubber needle protective cap production injection molding device

Abstract

The utility model belongs to the technical field of injection molds, and particularly relates to a medical rubber needle protective cap production injection molding device which comprises a double-sided female mold, a first male mold is arranged on one side of the double-sided female mold, a second male mold is arranged on the other side of the double-sided female mold, and the first male mold and the second male mold synchronously move on the two sides of the double-sided female mold in the same direction. The contact ends of the first male mold and the double-sided female mold and the contact ends of the second male mold and the double-sided female mold are provided with demolding plates for stripping the cooled rubber protective caps, and the demolding plates are movably connected with the first male mold and the second male mold; firstly, the double-face female die is arranged to be matched with the first male die and the second male die, the rubber protective cap can be naturally cooled while the production efficiency is guaranteed, the forming internal stress can be released, meanwhile, non-uniform shrinkage caused by rapid cooling is avoided, and therefore the quality of the rubber protective cap is higher; secondly, the first male mold and the second male mold can be matched with the double-sided female mold in a switching mode through the arranged one-way lead screw and the inner threaded sleeve, and then the arranged demolding plate can be driven by the one-way lead screw to enable the naturally-cooled rubber protective cap to automatically fall off.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molds, and particularly relates to an injection device for producing medical rubber needle caps. Background Technique

[0002] The injection mold for medical needle caps is an important tool for producing medical needle protectors, which has the characteristics of fixed molds, multi-cavity molds, etc. The injection mold for medical needle caps is used to produce medical needle protectors, which are supporting products for the standard luer connectors of medical infusion sets, used to protect the needles and prevent contamination and damage. Medical needle caps are usually injection molded with high-quality rubber materials such as natural rubber, styrene-butadiene rubber, and cis-butadiene rubber. These materials have excellent elasticity, modulus at a specified elongation, tear resistance, and electrical insulation, and good wear resistance, which can meet the special needs of the medical industry.

[0003] The existing production molds for rubber needle caps for needles are generally of a two-mode structure, that is, male and female molds. When injecting, the molds are closed. After molding, the finished products are quickly cooled by a cooling machine, and then the molded rubber needle caps are taken out to continue the injection work.

[0004] Although rapid cooling can improve production efficiency, if the cooling speed is too fast, it may cause the rubber to not be fully cooled and cured, thereby affecting the product size accuracy and mechanical properties. At the same time, rapid cooling may also cause problems such as uneven shrinkage and excessive internal stress in the rubber needle caps, thereby affecting the product quality.

[0005] To solve the above problems, an injection device for producing medical rubber needle caps is proposed in this application. Summary of the Utility Model

[0006] The purpose of the utility model is to provide an injection device for producing medical rubber needle caps, which solves the problems raised in the above background technique.

[0007] To solve the above technical problems, the utility model is realized through the following technical solutions:

[0008] The utility model is an injection device for producing medical rubber needle caps, including a double-sided female mold. A first male mold is arranged on one side of the double-sided female mold, and a second male mold is arranged on the other side. The first male mold and the second male mold move in the same direction and synchronously on both sides of the double-sided female mold. Demolding plates for peeling the rubber needle caps after cooling are arranged at the contact ends of the first male mold, the second male mold and the double-sided female mold. The demolding plates are movably connected to the first male mold and the second male mold. The injection device also includes symmetrically distributed mounting plates. A guide rod is fixed between the two mounting plates. Side guide sleeves that slide outside the guide rod are fixed on the sides of the first male mold and the second male mold. The double-sided female mold, the first male mold and the second male mold are all movably installed in the guide rod.

[0009] Further, symmetric side sliding sleeves are fixedly arranged on the side of the double-sided female mold and slide outside the guide rods. Two side sliding sleeves are arranged at the connection of the double-sided female mold and each guide rod. Symmetric movable sleeves and a first spring located between the two movable sleeves are arranged between the two side sliding sleeves.

[0010] Further, an activity groove for slidingly cooperating with the movable sleeve is formed in the middle of the guide rod, and the first spring is sleeved outside the guide rod where the activity groove is formed.

[0011] Further, a demolding hole that fits the model on the male mold is formed in the demolding plate. One end of the demolding plate is fixedly provided with a telescopic rod that slides in the male mold. A second spring is arranged between the telescopic rod and the male mold, and the demolding plate is attached to the male mold through the second spring.

[0012] Further, a limiting rod is fixedly arranged on the side of the demolding plate. A limiting groove for cooperating with the limiting rod is formed in the guide rod, and the movement range of the demolding plate is limited by the sliding of the limiting rod and the limiting groove.

[0013] Further, a one-way lead screw is connected between the two mounting plates. Inner threaded sleeves that are threadedly engaged with the one-way lead screw are arranged outside the male molds. A motor is installed at the upper end of one mounting plate through a bracket, and the one-way lead screw and the motor are driven by a belt.

[0014] Further, the middle part of the outer side of the one-way lead screw is smooth, and an upper sliding sleeve that slides on the smooth part of the one-way lead screw is fixedly arranged on the double-sided female mold.

[0015] The utility model has the following beneficial effects:

[0016] By setting the double-sided female mold to cooperate with the first male mold and the second male mold, when the first male mold or the second male mold cooperates with the double-sided female mold for injection molding, the rubber caps formed on the second male mold or the first male mold are naturally cooled. Natural cooling can release the molding internal stress, and at the same time avoid uneven shrinkage caused by rapid cooling, thereby making the quality of the rubber caps higher.

[0017] By setting the demolding plate, the demolding plate can automatically take out the rubber caps on the first male mold or the second male mold under the drive of the motor. At the same time, the motor can also drive the mutual cooperation between the double-sided female mold, the first male mold, and the second male mold, having the advantages of high structural cooperation degree, convenient use, good controllability, etc.

[0018] Of course, it is not necessary for any product implementing the utility model to achieve all the above-mentioned advantages simultaneously. Description of the Drawings

[0019] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for describing the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic diagram of the overall appearance structure of the present utility model;

[0021] Figure 2 For Figure 1 It is a schematic diagram of the front view structure;

[0022] Figure 3 For Figure 1 It is a schematic diagram of the structure after the second male mold and the double-sided female mold are clamped;

[0023] Figure 4 It is a schematic diagram of the structure when the rubber protective cap is separated from the first male mold;

[0024] Figure 5 For Figure 1 It is a schematic diagram of the structure after the double-sided female mold and the mounting plate are disassembled;

[0025] Figure 6 For Figure 1 It is a schematic diagram of the structure after the second male mold and the stripping plate are disassembled;

[0026] In the drawings, the list of components represented by each reference numeral is as follows:

[0027] In the figure: 1. Double-sided female mold; 11. Upper sliding sleeve; 12. Side sliding sleeve; 2. First male mold; 21. Internal thread sleeve; 22. Side guide sleeve; 3. Second male mold; 4. Stripping plate; 41. Demolding hole; 42. Telescopic rod; 43. Limit rod; 5. Mounting plate; 51. Guide rod; 52. Limit groove; 53. Movable groove; 6. Single-direction screw rod; 7. Motor; 8. Movable sleeve; 9. First spring; 10. Second spring. Specific embodiments

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0029] In the description of the present utility model, it should be understood that terms such as "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating orientation or positional relationships are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0030] Please refer to Figure 1-6 As shown, the present utility model is an injection molding device for producing medical rubber needle caps, including a double-sided female mold 1. On one side of the double-sided female mold 1, there is a first male mold 2, and on the other side, there is a second male mold 3. The first male mold 2 and the second male mold 3 move in the same direction and synchronously on both sides of the double-sided female mold 1. At the contact ends of the first male mold 2, the second male mold 3 and the double-sided female mold 1, there are demolding plates 4 for peeling off the rubber caps after cooling. The demolding plates 4 are movably connected to the first male mold 2 and the second male mold 3. It also includes symmetrically distributed mounting plates 5. Between the two mounting plates 5, a guide rod 51 is fixed. On the sides of the first male mold 2 and the second male mold 3, there are side guide sleeves 22 sliding outside the guide rod 51. The double-sided female mold 1, the first male mold 2, and the second male mold 3 are all movably installed in the guide rod 51.

[0031] Among them, on the side of the double-sided female mold 1, there are symmetrically arranged side sliding sleeves 12 sliding outside the guide rod 51. At the connection of the double-sided female mold 1 and each guide rod 51, there are two side sliding sleeves 12. Between the two side sliding sleeves 12, there are symmetrically arranged movable sleeves 8 and a first spring 9 located between the two movable sleeves 8. In this embodiment, by setting the side sliding sleeves 12, the double-sided female mold 1 can be moved outside the guide rod 51 and can also contact the movable sleeves 8, thereby cooperating with the first spring 9 to ensure the flexibility of use of the double-sided female mold 1.

[0032] Among them, in the middle of the guide rod 51, there is an activity groove 53 that slidably cooperates with the movable sleeve 8. The first spring 9 is sleeved outside the part of the guide rod 51 where the activity groove 53 is opened. In this embodiment, the movable sleeve 8 is only allowed to slide in a part of the activity groove 53. When the double-sided female mold 1 is not stressed, its position is stable. When the double-sided female mold 1 is stressed, the first spring 9 is compressed, and the double-sided female mold 1 will also move accordingly. This setting is for the convenience of the separation of the rubber sheath on the male mold.

[0033] Among them, in the demolding plate 4, there is a demolding hole 41 that coincides with the model on the male mold. At one end of the demolding plate 4, there is a telescopic rod 42 sliding in the male mold. Between the telescopic rod 42 and the male mold, there is a second spring 10. The demolding plate 4 is attached to the male mold through the second spring 10. In this embodiment, the model on the male mold can penetrate the demolding hole 41, and the rubber sheath is injection-molded on the part of the model that penetrates the demolding hole 41. When the demolding plate 4 is separated from the male mold, the rubber sheath on the model can be separated, realizing automatic blanking.

[0034] Among them, a limiting rod 43 is fixedly arranged on the side of the demolding template 4, and a limiting groove 52 for cooperating with the limiting rod 43 is opened in the guide rod 51. The movement range of the demolding template 4 is limited by the sliding of the limiting rod 43 and the limiting groove 52. In this embodiment, as Figure 4 shown, when the limiting rod 43 moves to the end of the limiting groove 52, it can no longer move. At this time, the demolding template 4 is separated from the first male mold 2, and the rubber cap on the first male mold 2 can be peeled off through the demolding hole 41. At the same time, the cooperation of the limiting rod 43 and the limiting groove 52 does not affect the cooperation between the male mold and the double-sided female mold 1.

[0035] Among them, a one-way lead screw 6 is connected between the two mounting plates 5. Inner threaded sleeves 21 that are threadedly matched with the one-way lead screw 6 are arranged outside the male molds. The upper end of one mounting plate 5 is provided with a motor 7 through a bracket. The one-way lead screw 6 and the motor 7 are driven by a belt. In this embodiment, after the one-way lead screw 6 is driven by the motor 7, it drives the inner threaded sleeves 21 on the first male mold 2 and the second male mold 3 to move synchronously in the same direction, so as to realize the switching of the cooperation with the double-sided female mold 1.

[0036] Among them, the middle part of the outer side of the one-way lead screw 6 is smooth, and an upper sliding sleeve 11 that slides on the smooth part of the one-way lead screw 6 is fixedly arranged on the double-sided female mold 1. In this embodiment, the cooperation between the upper sliding sleeve 11 and the one-way lead screw 6 enhances the use stability of the double-sided female mold 1 and does not affect the normal functions of the one-way lead screw 6 and its connecting parts.

[0037] It can be understood that first, setting the double-sided female mold to cooperate with the first male mold and the second male mold can naturally cool the rubber cap while ensuring production efficiency, release the molding internal stress, and avoid uneven shrinkage caused by rapid cooling, thereby making the quality of the rubber cap higher. Second, the one-way lead screw and the inner threaded sleeve are set to switch the first male mold and the second male mold to cooperate with the double-sided female mold. Then, the demolding template is set to automatically drop the naturally cooled rubber cap through the drive of the one-way lead screw.

[0038] A specific application of this embodiment is: as Figure 1 and Figure 2 shown, when the mold is in a non-working state, when injection molding is required, the motor 7 drives the one-way lead screw 6 to rotate through the pulley set. After the one-way lead screw 6 rotates, it simultaneously generates a helix with the inner threaded sleeves 21 on the first male mold 2 and the second male mold 3. The moving force of the helix drives the first male mold 2, the second male mold 3, and the demolding template 4 to move in the same direction, as Figure 3The second male mold 3 and the stripper plate 4 shown cooperate with the double-sided female mold 1. At this time, the rubber cap is injection-molded by the double-sided female mold 1 and the second male mold 3. The rubber cap located on the first male mold 2 is in a natural cooling state. When the rubber cap in the double-sided female mold 1 and the second male mold 3 is formed, the motor 7 continues to drive the one-way lead screw 6 to rotate in the first direction. At this time, the first male mold 2 and the second male mold 3 continue. Since the second male mold 3 is in a fitting state with the double-sided female mold 1, the second male mold 3 will drive the double-sided female mold 1 to move. When the double-sided female mold 1 moves, the side slip sleeve 12 slides along the outside of the guide rod 51 and drives the movable sleeve 8 at one end to slide outside the movable groove 53. At this time, the first spring 9 is compressed. The limit rod 43 on the side of the stripper plate 4 at the front end of the first male mold 2 has reached the end of the position limit groove 52, so the stripper plate 4 cannot continue to move with the first male mold 2. After the first male mold 2 moves, the telescopic rod 42 extends inside it, and the second spring 10 is compressed. At this time, the formed and cooled rubber cap on the first male mold 2 is peeled off by the stripper plate 4. Then the motor 7 reversely drives the one-way lead screw 6, the stripper plate 4 returns to the first male mold 2 under the action of the second spring 10, the double-sided female mold 1 returns under the action of the first spring 9, the second male mold 3 disengages from the side of the double-sided female mold 1, and the first male mold 2 is docked and assembled with the double-sided female mold 1. At this time, the double-sided female mold 1 and the first male mold 2 perform injection molding, and the second male mold 3 carries the incompletely cooled rubber cap to cool naturally on one side.

[0039] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0040] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principle and practical application of the present invention, so that those skilled in the relevant technical field can understand and utilize the present invention well. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. An injection molding device for producing medical rubber needle caps, characterized in that: It includes a double-sided master mold (1). On one side of the double-sided master mold (1), there is a first male mold (2), and on the other side, there is a second male mold (3). The first male mold (2) and the second male mold (3) move in the same direction and synchronously on both sides of the double-sided master mold (1). At the contact ends of the first male mold (2), the second male mold (3) and the double-sided master mold (1), there are stripping plates (4) for stripping the rubber caps after cooling. The stripping plates (4) are movably connected to the first male mold (2) and the second male mold (3). It also includes symmetrically distributed mounting plates (5). Between the two mounting plates (5), a guiding rod (51) is fixed. On the sides of the first male mold (2) and the second male mold (3), side guiding sleeves (22) that slide outside the guiding rod (51) are fixed. The double-sided master mold (1), the first male mold (2), and the second male mold (3) are all movably installed in the guiding rod (51).

2. The injection molding device for producing medical rubber needle caps according to claim 1, characterized in that: On the side of the double-sided master mold (1), symmetric and side sliding sleeves (12) that slide outside the guiding rod (51) are fixed. At the connection of the double-sided master mold (1) and each guiding rod (51), there are two side sliding sleeves (12). Between the two side sliding sleeves (12), there are symmetrically arranged movable sleeves (8) and a first spring (9) located between the two movable sleeves (8).

3. The injection molding device for producing medical rubber needle caps according to claim 2, characterized in that: In the middle of the guiding rod (51), there is an activity groove (53) that slidably cooperates with the movable sleeve (8). The first spring (9) is sleeved outside the activity groove (53) opened in the guiding rod (51).

4. A medical rubber needle guard cap production injection molding device according to claim 1, characterized in that: In the stripping plate (4), there is a stripping hole (41) that fits the model on the male mold. At one end of the stripping plate (4), a telescopic rod (42) that slides in the male mold is fixedly arranged. Between the telescopic rod (42) and the male mold, there is a second spring (10). The stripping plate (4) is attached to the male mold through the second spring (10).

5. The injection molding device for producing medical rubber needle caps according to claim 4, characterized in that: On the side of the stripping plate (4), a limiting rod (43) is fixedly arranged. In the guiding rod (51), there is a limiting groove (52) for cooperating with the limiting rod (43). The movement range of the stripping plate (4) is limited by the sliding of the limiting rod (43) and the limiting groove (52).

6. The injection molding device for producing medical rubber needle caps according to claim 1, characterized in that: A one-way lead screw (6) is connected between the two mounting plates (5). On the outside of the male mold, there are internal thread sleeves (21) that are threadedly engaged with the one-way lead screw (6). At the upper end of one of the mounting plates (5), a motor (7) is installed through a bracket. The one-way lead screw (6) and the motor (7) are connected by a belt drive.

7. The injection molding device for producing medical rubber needle caps according to claim 6, characterized in that: The middle part of the outside of the one-way lead screw (6) is smooth. On the double-sided master mold (1), an upper sliding sleeve (11) that slides on the smooth part of the one-way lead screw (6) is fixedly arranged.

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