Needle cylinder mold structure capable of shortening hot runner and stabilizing twisted teeth

Abstract

The utility model provides a needle cylinder mould structure capable of shortening a hot runner and stabilizing twisted teeth, which comprises a panel, an upper movable mould, an upper backing plate, a lower movable mould, a first lower backing plate, a second lower backing plate, a third lower backing plate and a bottom plate, the middle of the panel is downwards provided with a hot runner, the upper movable mould is provided with a plurality of downward mold cores, the lower movable mould is provided with a through hole, the first lower backing plate is provided with a forming groove, and the third lower backing plate is provided with a through hole. A thread twisting mechanism is arranged in the middle of the second lower base plate and comprises a forming rod, and forming threads are arranged at the upper end of the forming rod and extend upwards to the bottom of the forming groove. Hot melt glue directly passes through the hot runner of the panel to reach the gaps among the mold core, the through hole and the forming groove to form the injector tube body, compared with an existing mold, the injection mold has the advantages that the injector tube body is inversely formed, the length of the hot runner is shortened, the flowing time is shortened, and the glue injection efficiency is improved; unstable thread twisting of the thread twisting mechanism due to the heating influence of the hot runner is avoided, and the product quality is improved.

Description

Technical Field

[0001] The utility model relates to the field of molds, and more specifically, to a syringe mold structure with a shortened hot runner and stable thread tapping. Background Art

[0002] A mold is a tool used to manufacture formed products. Different shaped products can be made through different shapes of the mold. For example, Figure 1-2 As shown, the syringe barrel is overall slender, with a deep cavity and no draft angle. The injection port of the barrel is provided with internal threads. After the syringe barrel is formed, the product is ejected from the core by a top plate. Since the formed barrel and the core are in a vacuum state, the holding force between the barrel and the core is very large, and the barrel will be deformed when the top plate ejects, resulting in product damage. Therefore, how to realize the forming and demolding of the syringe barrel is an urgent problem to be solved. The existing patent: A mold with air blowing assisted ejection, patent number: CN220946503U. This existing patent can realize the forming and demolding of the syringe barrel, but the existing forming mold has the following problems: 1. The upper moving mold is very thick, resulting in a long injection flow path, increasing the flow time of the hot melt adhesive and reducing the forming efficiency; 2. Both the thread tapping system and the hot runner system are arranged in the front mold. When injecting, the hot runner system generates heat, causing thermal expansion of the thread tapping system and resulting in instability of the thread tapping system. In view of this, there is an urgent need for a mold that can replace the existing mold for forming the syringe barrel. Summary of the Utility Model

[0003] The utility model provides a syringe mold structure with a shortened hot runner and stable thread tapping, aiming to improve the technical problems mentioned in the above background art existing in the existing syringe forming mold.

[0004] To achieve the above object, the utility model adopts the following technical solutions: A syringe mold structure with a shortened hot runner and stable thread tapping, including a panel, an upper moving mold, an upper backing plate, a lower moving mold, a first lower backing plate, a second lower backing plate, a third lower backing plate and a bottom plate from top to bottom. A hot runner is arranged downward in the middle of the panel. A number of downward cores are arranged in the upper moving mold. The cores can slide through the upper backing plate. A through hole is opened in the lower moving mold. A funnel-shaped forming groove is opened in the first lower backing plate. A thread tapping mechanism is arranged in the middle of the second lower backing plate. The thread tapping mechanism includes a forming rod. The upper end of the forming rod is provided with a forming thread, and the forming thread of the forming rod extends upward through the first lower backing plate to the bottom of the forming groove.

[0005] Further, a screw sleeve is arranged in the third lower backing plate, and a moving thread is arranged on the lower side of the forming rod.

[0006] Further, the thread tapping mechanism further includes an oil cylinder, a rack and a gear. The gear is sleeved and fixed on the forming rod, the rack meshes with the gear, and the oil cylinder drives the rack to move.

[0007] Further, the hot runner includes a main runner and a sub-runner, and the sub-runner is arranged at the lower end of the main runner.

[0008] Further, a secondary mold opening mechanism is arranged on the upper backing plate and the side surface of the lower moving mold. The secondary mold opening mechanism includes a connecting rod, an upper guiding bolt arranged on the upper backing plate, and a lower guiding bolt arranged on the side surface of the lower moving mold. The connecting rod is provided with an upper strip hole and a lower strip hole. The upper guiding bolt is placed in the upper strip hole, and the lower guiding bolt is placed in the lower strip hole.

[0009] Further, there are four core pins, and the corresponding through holes and forming grooves each include four.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] The syringe mold structure of the present utility model with a shortened hot runner and stable thread tapping is reasonably and ingeniously designed. It includes a panel, an upper moving mold, an upper backing plate, a lower moving mold, a first lower backing plate, a second lower backing plate, a third lower backing plate and a bottom plate from top to bottom. A hot runner is arranged downward in the middle of the panel. A number of downward core pins are arranged on the upper moving mold. A through hole is opened on the lower moving mold. A funnel-shaped forming groove is opened on the first lower backing plate. A thread tapping mechanism is arranged in the middle of the second lower backing plate. The thread tapping mechanism includes a forming rod. The upper end of the forming rod is provided with a forming thread, and the forming thread of the forming rod extends upward through the first lower backing plate to the bottom of the forming groove. The hot melt adhesive directly passes through the hot runner of the panel to the gap between the core pins, the through hole and the forming groove to form the syringe tube body. Compared with the existing mold that forms the syringe tube body in an inverted manner, the length of the hot runner of the present utility model is reduced, the flow time is reduced, and the injection efficiency is improved. On the other hand, the thread tapping mechanism and the hot runner are arranged separately up and down, avoiding the instability of thread tapping caused by the influence of the heat of the hot runner, and improving the quality of the product. Description of the Drawings

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0013] Figure 1 It is a schematic structural diagram of a syringe tube body;

[0014] Figure 2 It is a schematic structural diagram of the syringe tube body from another angle;

[0015] Figure 3It is a structural schematic diagram of the syringe mold structure of the present utility model for shortening the hot runner and stabilizing the thread tapping;

[0016] Figure 4 It is a schematic diagram of the panel structure of the syringe mold structure of the present utility model for shortening the hot runner and stabilizing the thread tapping;

[0017] Figure 5 It is a schematic diagram of the structure of the upper moving mold and the upper backing plate of the syringe mold structure of the present utility model for shortening the hot runner and stabilizing the thread tapping;

[0018] Figure 6 It is a partial structural schematic diagram of the runner of the syringe mold structure of the present utility model for shortening the hot runner and stabilizing the thread tapping;

[0019] Figure 7 It is a schematic diagram of the structure of the lower moving mold of the syringe mold structure of the present utility model for shortening the hot runner and stabilizing the thread tapping;

[0020] Figure 8 It is a schematic diagram of the structure of the first lower backing plate of the syringe mold structure of the present utility model for shortening the hot runner and stabilizing the thread tapping;

[0021] Figure 9 It is a schematic diagram of the structure of the thread tapping mechanism of the syringe mold structure of the present utility model for shortening the hot runner and stabilizing the thread tapping;

[0022] Figure 10 It is a schematic diagram of the mating structure of the formed thread and the formed groove of the syringe mold structure of the present utility model for shortening the hot runner and stabilizing the thread tapping.

[0023] Description of Main Component Symbols

[0024] 10. Panel; 101. Main runner; 102. Sub-runner;

[0025] 20. Upper moving mold; 201. Core;

[0026] 30. Upper backing plate; 301. Connecting rod;

[0027] 40. Lower moving mold; 401. Through hole;

[0028] 50. First lower backing plate; 501. Formed groove;

[0029] 60. Second lower backing plate; 601. Oil cylinder; 602. Rack; 603. Gear; 604. Forming rod; 6041. Formed thread;

[0030] 70. Third lower backing plate;

[0031] 80. Bottom plate;

[0032] 90. Syringe tube body; 901. Internal thread. Detailed Implementation Manner

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in 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. Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. Based on the embodiments in 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.

[0034] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under", and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0036] Embodiment

[0037] Refer to Figure 3 As shown, the present utility model discloses a syringe mold structure that shortens the hot runner and stabilizes the thread rolling, including a top-down panel 10, an upper moving mold 20, an upper backing plate 30, a lower moving mold 40, a first lower backing plate 50, a second lower backing plate 60, a third lower backing plate 70, and a bottom plate 80.

[0038] Refer to Figures 4-7As shown in the figure, a hot runner is arranged downward in the middle of the panel 10, and several downward core rods 201 are arranged on the upper moving die 20. The core rods 201 can slide through the upper backing plate 30. A through hole 401 is opened in the lower moving die 40, and a funnel-shaped forming groove 501 is opened in the first lower backing plate 50. Specifically, the hot runner includes a main runner 101 and a sub-runner 102. The sub-runner 102 is arranged at the lower end of the main runner 101. When the mold is closed, the core rods 201 pass through the through hole 401, and the lower ends are placed in the forming groove 501. The sub-runner 102 communicates from between the upper backing plate 30 and the lower moving die 40 to the through hole 401. The hot melt adhesive cools and forms the main body part of the syringe tube body 90 in the gap between the core rod 201 and the through hole 401 and the forming groove 501. The utility model adopts an inverted molding syringe tube body 90, which can reduce the length of the hot runner, increase the flow time of the hot melt adhesive, and improve the injection efficiency compared with the existing patents using a vertical positive molding structure.

[0039] Furthermore, there are four core rods 201, and the corresponding through holes 401 and forming grooves 501 each include four. One-time injection can form 4 inverted syringe tube bodies 90, improving production efficiency.

[0040] Refer to Figures 8-10 As shown in the figure, a threading mechanism is arranged in the middle of the second lower backing plate 60. The threading mechanism includes a forming rod 604. The upper end of the forming rod 604 is provided with a forming thread 6041, and the forming thread 6041 of the forming rod 604 extends upward through the first lower backing plate 50 to the bottom of the forming groove 501. Specifically, a screw sleeve is arranged in the third lower backing plate 70, and a moving thread is arranged on the lower side of the forming rod 604. Rotating the forming rod 604 makes the moving thread cooperate with the screw sleeve to realize the up and down movement of the forming rod 604. When the mold is closed, the forming rod 604 moves upward so that the forming thread 6041 extends into the bottom of the forming groove 501 to form the internal thread 901 of the injection port of the syringe tube body 90. The threading mechanism includes an oil cylinder 601, a rack 602 and a gear 603. The gear 603 is sleeved and fixed on the forming rod 604, and the rack 602 meshes with the gear 603. The oil cylinder 601 drives the rack 602 to move, and drives the rotation of the gear 603 through the movement of the oil cylinder 601 driving the rack 602, realizing the up and down movement of the forming rod 604. Compared with the traditional threading mechanism arranged on the lower side of the mold and separated from the hot runner up and down, it avoids the threading instability caused by the influence of the heat of the hot runner, improving the quality of the product.

[0041] Refer to Figures 3-10As shown in the figure, a secondary mold opening mechanism is provided on the side of the upper backing plate 30 and the lower moving mold 40. The secondary mold opening mechanism includes a connecting rod 301, an upper guiding bolt provided on the upper backing plate 30, and a lower guiding bolt provided on the side of the lower moving mold 40. The connecting rod 301 is provided with an upper strip-shaped hole and a lower strip-shaped hole. The upper guiding bolt is placed in the upper strip-shaped hole, and the lower guiding bolt is placed in the lower strip-shaped hole. Specifically, the mold opening sequence of the present utility model includes: first, controlling the forming rod 604 to move downward so that the forming thread 6041 withdraws from the internal thread 901 of the syringe injection port; then, the panel 10, the upper moving mold 20, and the upper backing plate 30 move upward so that the core 201 is pulled out from the through hole 401 of the lower fixed mold and the forming groove 501 of the first lower backing plate 50, and the product falls into the through hole 401; finally, when the core 201 is completely withdrawn, the upper backing plate 30 drives the lower guiding bolt through the connecting rod 301 by the upper guiding bolt to drive the lower moving mold 40 to move upward, and the product is driven out of the forming groove 501 by the sheets on both sides of the syringe tube body 90, that is, the demolding of the product is realized.

[0042] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A syringe mold structure with a shortened hot runner and stable threading, characterized in that: It includes a panel, an upper movable mold, an upper pad, a lower movable mold, a first lower pad, a second lower pad, a third lower pad and a bottom plate from top to bottom, a hot runner is arranged downward in the middle of the panel, the upper movable mold is provided with a plurality of cores facing downward, the cores can slide through the upper pad, the lower movable mold is provided with a through hole, the first lower pad is provided with a funnel-shaped molding groove, a threading mechanism is arranged in the middle of the second lower pad, the threading mechanism includes a molding rod, a molding thread is arranged at the upper end of the molding rod, and the molding thread of the molding rod extends upward through the first lower pad to the bottom of the molding groove.

2. The syringe mold structure with shortened hot runner and stable thread cutting according to claim 1 is characterized in that: A screw sleeve is arranged inside the third lower pad, and a movable thread is arranged on the lower side of the forming rod.

3. The syringe mold structure with shortened hot runner and stable thread according to claim 1, characterized in that: The thread cutting mechanism preferably comprises an oil cylinder, a rack and a gear, the gear is sleeved and fixed on the forming rod, the rack is meshed with the gear, and the oil cylinder drives the rack to move.

4. The syringe mold structure with shortened hot runner and stable thread cutting according to claim 1, characterized in that: The hot runner includes a main runner and a branch runner, and the branch runner is arranged at the lower end of the main runner.

5. The syringe mold structure with shortened hot runner and stable thread cutting according to claim 1, characterized in that: A secondary mold opening mechanism is arranged on the upper pad and the side of the lower movable mold, and the secondary mold opening mechanism includes a connecting rod, an upper guide bolt arranged on the upper pad and a lower guide bolt arranged on the side of the lower movable mold, the connecting rod is provided with an upper strip hole and a lower strip hole, the upper guide bolt is placed in the upper strip hole, and the lower guide bolt is placed in the lower strip hole.

6. The syringe mold structure with shortened hot runner and stable thread cutting according to claim 1, characterized in that: The cores include four, and the corresponding through holes and molding grooves include four respectively.

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