CN222309618U - Spiral demoulding structure of medical instrument connecting piece - Google Patents

Abstract

The utility model relates to a spiral demolding structure of a medical instrument connecting piece, which comprises a template group, a mold core, a thread forming mechanism and an opening connecting assembly, wherein the template group comprises an upper template and a lower template which are overlapped during mold assembly, a mold cavity is arranged between the upper template and the lower template, the mold core group is positioned in the mold cavity and is provided with a forming cavity capable of forming the appearance of the medical instrument connecting piece, the mold core is positioned in the forming cavity and is used for forming the inner wall of the medical instrument connecting piece, the thread forming mechanism is used for forming the inner thread of the medical instrument connecting piece, the template group is provided with three opening strokes under the action of the opening connecting piece, the upper template is upwards moved under the action of a mold frame during a first opening stroke, the upper template and the lower template are separated, the upper template and the lower template are simultaneously upwards moved during a second opening stroke, the medical instrument connecting piece is separated from a mold core on the mold frame, and the upper template is continuously upwards moved during a third opening stroke, and the upper template is completely separated from the lower template, and the opening of the mold is completed.

Description

Spiral demoulding structure of medical instrument connecting piece

Technical Field

The utility model relates to the technical field of injection molds, in particular to a spiral demolding structure of a medical instrument connecting piece.

Background

In recent years, with the wide application of plastic products, the mold technology has been rapidly developed, and the mold design and the mold manufacturing have been obviously improved. The requirements for products are more and more increased, at present, for plastic products with threads, the products are generally opened up and down or left and right according to the appearance of the products, so that a seam exists in the middle of the products, the appearance of the products is affected, and the existing demoulding mechanism ejects the products through a plurality of ejector pins, so that the structure is complex, and the cost investment is large.

The key part of the injection molding die for the threaded shell is smooth demolding of threads, and the demolding method is improper, so that the threads are damaged easily, and the product is scrapped. Screw thread injection moulding mould generally relies on the screw thread type ring on the mould cavity to make, and current common drawing of patterns mode includes two kinds, and one kind is rotatory drawing of patterns, usually adopts rotatory drawing of patterns in prior art, and screw thread core is followed the spiral and is rotated out from the product to make the complete drawing of patterns of screw thread.

In the medical instrument connecting piece, except being provided with the screw thread, can also set up the hem at the edge generally, and the hem is thinner, can produce the adhesion when adopting ordinary ejector pin structure to carry out ejecting and lead to the hem to damage and produce the deckle edge.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides a spiral demoulding structure of a medical instrument connecting piece.

The technical scheme provided by the utility model for solving the technical problems is as follows:

Comprising the steps of (a) a step of,

The template group comprises an upper template and a lower template which are overlapped during die assembly, and a die cavity is arranged between the upper template and the lower template;

the die core group is positioned in the die cavity and is provided with a forming die cavity capable of forming the appearance of the medical instrument connecting piece;

The mold core is positioned in the molding cavity and is used for molding the inner wall of the medical instrument connecting piece;

the medical instrument connector also comprises a thread forming mechanism for forming internal threads of the medical instrument connector;

The die plate group is provided with a die opening connecting assembly, and the die plate group is provided with three die opening strokes under the action of the die opening connecting piece;

During the first mold opening stroke, the upper mold plate moves upwards under the action of the mold frame, and the upper mold plate and the lower mold plate are separated;

in the second mold opening stroke, the upper mold plate and the lower mold plate move upwards simultaneously, so that the medical instrument connecting piece is separated from the mold core on the mold frame;

And in the third die opening stroke, the upper die plate continues to move upwards and is completely separated from the lower die plate, so that die opening is completed.

The technical scheme is further that the die-sinking connecting assembly comprises an upper fixing hook and a lower fixing hook which are respectively fixed on the upper die plate and the lower die plate, and an idle stroke distance is arranged between two hook parts of the upper fixing hook and the lower fixing hook.

The technical scheme is further characterized in that the lower die plate is further provided with an ejection part, an ejection head of the ejection part is positioned above the lower fixing hook, and the ejection part is used for ejecting the upper fixing hook from the lower fixing hook.

The technical scheme is further characterized in that a chute is arranged in the middle of the upper fixing hook in a downward extending mode, and a limiting rod is arranged at the lower end of the chute;

The ejection head is positioned in the chute and can eject the limiting rod.

The technical scheme is that the ejection head is a convex part arranged on the ejection part, and the convex part faces away from one side of the lower fixing hook;

The end face of one side of the ejection head, which is away from the lower fixing hook, is sequentially connected with an outer driving surface, an ejection surface and a reset surface from bottom to top.

The technical scheme is further characterized in that a connecting block is arranged on the upper template, the upper fixing hook is hinged to the connecting block, and the upper fixing hook can swing out relative to the upper template.

The technical scheme is further that the thread forming mechanism comprises a rack driven by a driving part, a gear meshed with the rack is arranged in the upper die plate, and the internal thread forming head is arranged below the gear and rotates along with the gear.

The technical scheme is further characterized in that the upper die plate is provided with a movable groove capable of accommodating rotation and axial movement of the gear, and the gear is limited and moves in the movable groove.

The technical scheme is further characterized in that the movable groove is communicated with the forming cavity, the center of the gear is provided with movable columns in an extending mode towards two sides, and the internal thread forming head is connected below the movable columns.

The technical scheme is further characterized in that a limiting sleeve is connected with the movable column above the gear in a threaded mode, and the limiting sleeve is fixed in the movable groove to limit the gear.

Compared with the prior art, the utility model has the beneficial effects that:

The upper die plate and the lower die plate are opened in a segmented mode through the die opening connecting assembly, the lower die core is separated from the product firstly and then is opened completely, adhesion between the folded edges of the product and the die core is ensured to produce defective products in the die opening process, and the demoulding rate of the finished product is improved;

And demolding the internal thread of the product by screwing out the thread, and ensuring the integrity of the internal thread before the die plate is opened.

Drawings

Fig. 1 is a schematic diagram of the overall structure of the present utility model.

Fig. 2 is a schematic cross-sectional structure of the present utility model.

Fig. 3 is an enlarged schematic view of the C part in fig. 2.

Fig. 4 is a schematic structural view of the die-sinking connecting assembly.

Fig. 5 is a schematic structural view of the upper and lower templates after a first stroke.

Fig. 6 is an enlarged view of the portion D in fig. 5.

Fig. 7 is a schematic structural view of the upper and lower templates after the second stroke.

Fig. 8 is a schematic cross-sectional structure after the secondary stroke.

Fig. 9 is an enlarged schematic view of the E-site in fig. 8.

Fig. 10 is a schematic view of the structure of the die-cut connection assembly during the detachment process.

Fig. 11 is an enlarged schematic view of the portion a in fig. 10.

Fig. 12 is a schematic structural view of the thread forming mechanism.

Fig. 13 is an enlarged schematic view of the B part in fig. 2.

100, An upper template;

200. a lower template;

300. The die-opening connecting assembly comprises a die-opening connecting assembly, an upper fixing hook, a lower fixing hook, a connecting block, a 340, an ejection part, a 341, an ejection head, a 350, a limiting rod, a 341.1, an outer driving surface, a 341.2, an ejection surface and a 341.3 reset surface;

410. 420, auxiliary core;

500. A product;

600. An auxiliary plate;

700. A driving part;

810. Rack 820, gear 822, internal thread forming head 821, movable post 830 and limit sleeve;

a. A movable groove.

Detailed Description

In order to further describe the technical means and effects adopted by the present utility model for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present utility model with reference to the accompanying drawings and preferred embodiments.

As shown in fig. 1-13, the present embodiment discloses a spiral stripping structure for a medical instrument connector.

Referring specifically to fig. 1, specifically included,

The template group comprises an upper template 100 and a lower template 200 which are overlapped during die assembly, and a die cavity is arranged between the upper template 100 and the lower template 200;

the die core group is positioned in the die cavity and is provided with a forming die cavity capable of forming the appearance of the medical instrument connecting piece;

The mold core is positioned in the molding cavity and is used for molding the inner wall of the medical instrument connecting piece;

the medical instrument connector also comprises a thread forming mechanism for forming internal threads of the medical instrument connector;

The template group is provided with a die opening connecting assembly 300, and the template group has three die opening strokes under the action of a die opening connecting piece;

During the first mold opening stroke, the upper mold plate 100 moves upwards under the action of the mold frame, and the upper mold plate 100 and the lower mold plate 200 are separated;

In the second mold opening stroke, the upper mold plate 100 and the lower mold plate 200 simultaneously move upwards to separate the medical instrument connecting piece from the mold core on the mold frame;

At the third die opening stroke, the upper die plate 100 continues to move upward and is completely separated from the lower die plate 200, completing die opening.

The above is the basic scheme of the present embodiment.

When the mold is closed, the thread part of the thread forming mechanism extends into the forming cavity, the injection molding material enters the forming cavity through the material channel to form the medical appliance connecting piece with the internal thread and the folded edge, after the injection molding is finished, the mold is opened, the mold opening process is divided into four steps, namely, 1, the thread forming mechanism moves to rotate the thread part out of the forming cavity to form the internal thread on the product 500, 2, the mold plate is opened, the upper mold plate 100 and the lower mold plate 200 are separated in a first stroke, and the upper mold plate 100 drives the thread forming mechanism to move together in the separation process, so that the thread forming mechanism completely withdraws from the product 500, 3, the upper mold plate 100 continuously moves and drives the lower mold plate 200 to move together, the lower mold core on the lower mold plate 200 and the product 500 simultaneously, so that the mold core withdraws from the lower part in the product 500 and is separated from the folded edge, 4, the mold opening is continuously performed, and the third stroke, the upper mold plate 100 and the lower mold plate 200 are separated, and the mold opening is finished.

Referring to fig. 2 and 3, in the present embodiment, the folds in the product 500 have a horizontal fold and a vertical fold vertically downward, and thus, the core in the present embodiment includes a main core 410 forming the inner wall of the product 500 and an auxiliary core 420 forming the folds, the auxiliary core 420 being located under the folds, and being separated from the folds from below when the mold is opened.

Preferably, the main core 410 and the auxiliary core 420 are separately provided in this embodiment, and may be integrally provided in other embodiments.

Referring to fig. 4, the die-sinking connecting assembly 300 in this embodiment includes an upper fixing hook 310 and a lower fixing hook 320 respectively fixed on the upper die plate 100 and the lower die plate 200, and an idle stroke distance is provided between two hook portions of the upper fixing hook 310 and the lower fixing hook 320.

Referring specifically to fig. 5 and 6, when the die plate assembly is opened, the upper die plate 100 and the lower die plate 200 are separated, and in the range of the idle stroke distance, the upper fixing hook 310 and the lower fixing hook 320 are in a separated state, and the upper die plate 100 does not drive the lower die plate 200 to move, so that the first separation between the upper die plate 100 and the lower die plate 200 is realized, and the thread forming mechanism in the upper die plate 100 is completely separated from the product 500.

When the upper die plate 100 runs through the first stroke, the hook portion of the upper fixing hook 310 is contacted with the hook portion of the lower fixing hook 320, and at this time, when the upper die plate 100 continues to open, the lower die plate 200 is driven together under the action of the hook structure, so that the lower die plate 200 and the upper die plate 100 move together.

Referring specifically to fig. 7 and 8, as the upper die plate 100 continues to move away from the lower die plate 200, the lower die plate 200 and the upper die plate 100 move simultaneously, which is the insert in the lower die plate 200 moves together with the product 500, thereby being separated from the core below.

Referring to fig. 9, in this embodiment, two auxiliary cores 420 are provided, so that in order to ensure that the vertical folds on the product 500 are separated safely, in the second stroke, the auxiliary cores 420 close to the vertical folds are separated from the product 500, and the other auxiliary core 420 is made to support the horizontal folds on the product 500, so that the adhesion between the horizontal folds and the separated auxiliary cores 420 in the separation process is avoided.

In order to implement the above-mentioned disengagement process, in the present embodiment, the lower end of the auxiliary core 420 near the vertical flange is fixed to the auxiliary plate 600, and the lower end of the other auxiliary core 420 is fixed to the lower die plate 200 so as to be movable along with the lower die plate 200.

When the demolding of the auxiliary core 420 is completed, the mold opening operation of the upper mold plate 100 and the lower mold plate 200 needs to be continued, in this embodiment, the lower mold plate 200 is further provided with an ejector component 340, an ejector head 341 of the ejector component 340 is located above the lower fixing hook 320, and when the upper fixing hook 310 continuously moves upwards to reach the position of the ejector head 341, the ejector head 341 can eject the hook portion of the upper fixing hook 310 outwards, so that the upper fixing hook 310 and the lower fixing hook 320 are separated.

In this embodiment, an auxiliary plate 600 is disposed below the lower die plate 200, the lower end of the ejector 340 is fixed to the auxiliary plate 600, and the upper end extends to the side of the lower die plate 200.

Referring to fig. 10 and 11, when the upper fixing hook 310 and the lower fixing hook 320 are hooked, the lower fixing hook 320 is driven to move together, and when moving to the end of the second stroke, the upper fixing hook 310 moves below the ejector head 341 of the ejector 340, and the mold is continuously opened, the upper mold plate 100 drives the upper fixing hook 310 to move, so that the upper fixing hook 310 moves to the position of the ejector head 341, and moves outwards under the ejection action of the ejector head 341, thereby being separated from the lower fixing hook 320.

In this embodiment, the upper fixing hook 310 is specifically implemented by extending a chute downward from the middle of the upper fixing hook 310, and a stop lever 350 is disposed at the lower end of the chute;

The ejection head 341 is located in the chute and is capable of ejecting the limit lever 350.

When the limit rod 350 moves upward along with the upper fixing hook 310 to contact the ejector head 341, the ejector head 341 ejects the limit rod 350 outward, so that the hook portion of the upper fixing hook 310 also moves outward.

In this embodiment, the ejector head 341 is a protrusion disposed on the ejector member 340, and the protrusion faces away from the side of the lower fixing hook 320;

The end surface of the top head 341 facing away from the side of the lower fixing hook 320 is sequentially provided with an outer driving surface 341.1, an ejection surface 341.2 and a reset surface 341.3 from bottom to top.

Referring to fig. 4, the ejection surface 341.2 is located at the outermost end of the ejection head 341 and is a vertical surface;

The outer driving surface 341.1 is located below the ejection surface 341.2 and is an inclined surface, when the lower fixing hook 320 moves upwards along with the upper template 100, the limiting rod 350 moves along the outer driving surface 341.1, and the outer driving surface 341.1 applies an inclined outward ejection force to the limiting rod 350, so that the limiting rod 350 is ejected outwards;

The reset surface 341.3 is also an inclined surface and is symmetrical to the external driving surface 341.1. When the stop lever 350 is ejected and moves up to the outer side of the ejection surface 341.2, the die continues to open, the upper die plate 100 drives the upper fixing hook 310 to move upward, and the stop lever 350 also moves up to the reset surface 341.3 and slides along the reset surface 341.3 until sliding to the vertical direction.

In this embodiment, in order to realize outward movement of the hook portion on the upper fixing hook 310, the upper fixing hook 310 is hinged so that the hook portion can rotate around the upper end of the upper fixing hook 310, and in a specific embodiment, a connection block 330 is provided on the upper die plate 100, and the upper fixing hook 310 is hinged on the connection block 330 and can swing out with respect to the upper die plate 100.

In this embodiment, the screw thread forming mechanism includes a rack 810 driven by the driving component 700, a gear 820 meshed with the rack 810 is disposed in the upper die plate 100, and an internal screw thread forming head 822 is disposed below the gear 820 and rotates along with the gear 820.

Referring to fig. 12, the driving part 700 is positioned outside the mold, and the rack 810 is inserted into the mold to be engaged with the gear 820, and the lower end of the gear 820 is connected to the internally threaded forming head 822 having gear teeth. When the driving part 700 drives the rack 810 to move, the gear 820 rotates, so that the internal thread forming head 822 rotates out of the product 500, and the forming quality of the internal thread is ensured.

Preferably, in this embodiment, the driving member 700 may be a driving cylinder, which drives the rack 810 to horizontally move.

When the gear 820 rotates, the internal thread forming head 822 moves upwards relative to the product 500, so that the gear 820 also moves upwards, and in order to limit the movement range of the gear 820, the upper die plate 100 is provided with a movable groove a capable of accommodating the rotation and axial movement of the gear 820, and the gear 820 is limited to move in the movable groove a.

Referring to fig. 13, the movable groove a is in communication with the molding cavity, the center of the gear 820 is extended to two sides to form a movable column 821, and the core is connected below the movable column 821.

In order to stably connect the gear 820 and the movable post 821, a stop collar 830 is screwed on the movable post 821 above the gear 820, and the stop collar 830 is fixed in the movable slot a to stop the gear 820.

When the gear 820 is rotated, a screw rotation is also formed between the movable stem 821 and the stopper 830, thereby ensuring that the movable stem 821 is not shaken and is not contacted with the upper die plate 100 during the rotation.

The present utility model is not limited in any way by the above-described preferred embodiments, but is not limited to the above-described preferred embodiments, and any person skilled in the art will appreciate that the present utility model can be embodied in the form of a program for carrying out the method of the present utility model, while the above disclosure is directed to equivalent embodiments capable of being modified or altered in some ways, it is apparent that any modifications, equivalent variations and alterations made to the above embodiments according to the technical principles of the present utility model fall within the scope of the present utility model.

Claims (10)

1. A spiral demoulding structure of a medical instrument connecting piece comprises,

The template group comprises an upper template (100) and a lower template (200) which are overlapped during die assembly, and a die cavity is arranged between the upper template (100) and the lower template (200);

the die core group is positioned in the die cavity and is provided with a forming die cavity capable of forming the appearance of the medical instrument connecting piece;

The mold core is positioned in the molding cavity and is used for molding the inner wall of the medical instrument connecting piece;

the medical instrument connecting piece is characterized by also comprising a thread forming mechanism for forming internal threads of the medical instrument connecting piece;

The die plate group is provided with a die opening connecting assembly (300), and the die plate group is provided with three die opening strokes under the action of the die opening connecting piece;

During a first die opening stroke, the upper die plate (100) moves upwards under the action of the die frame, and the upper die plate (100) and the lower die plate (200) are separated;

in the second mold opening stroke, the upper mold plate (100) and the lower mold plate (200) move upwards simultaneously, so that the medical instrument connecting piece is separated from the mold core on the mold frame;

And in the third die opening stroke, the upper die plate (100) continues to move upwards and is completely separated from the lower die plate (200), so that die opening is completed.

2. The spiral demoulding structure of a medical instrument connector according to claim 1, wherein the die-sinking connecting assembly (300) comprises an upper fixing hook (310) and a lower fixing hook (320) which are respectively fixed on the upper die plate (100) and the lower die plate (200), and a free travel distance is arranged between two hook parts of the upper fixing hook (310) and the lower fixing hook (320).

3. The spiral demolding structure of a medical device connecting piece according to claim 2, wherein the lower mold plate (200) is further provided with an ejection component (340), an ejection head (341) of the ejection component (340) is located above the lower fixing hook (320), and the spiral demolding structure is configured to release the upper fixing hook (310) from the lower fixing hook (320).

4. The spiral demoulding structure of the medical instrument connector according to claim 3, wherein a chute is arranged in the middle of the upper fixing hook (310) in a downward extending manner, and a limit rod (350) is arranged at the lower end of the chute;

The ejection head (341) is positioned in the chute and can eject the limit rod (350).

5. The spiral demoulding structure of a medical instrument connector according to claim 3 or 4, wherein the ejection head (341) is a convex part arranged on the ejection part (340) and is away from one side of the lower fixing hook (320);

The end face of one side of the ejection head (341) away from the lower fixing hook (320) is sequentially connected with an outer driving surface (341.1), an ejection surface (341.2) and a reset surface (341.3) from bottom to top.

6. The spiral demoulding structure of a medical instrument connector according to claim 5, wherein a connecting block (330) is arranged on the upper template (100), and the upper fixing hook (310) is hinged on the connecting block (330) and can swing out relative to the upper template (100).

7. The screw demolding structure of a medical device connector according to claim 1, wherein the screw molding mechanism comprises a rack (810) driven by a driving component (700), a gear (820) meshed with the rack (810) is arranged in the upper mold plate (100), and an internal screw molding head (822) is arranged below the gear (820) and rotates along with the gear (820).

8. The spiral demoulding structure of a medical instrument connector according to claim 7, wherein the upper template (100) is provided with a movable groove (a) capable of accommodating rotation and axial movement of the gear (820), and the gear (820) is limited and moves in the movable groove (a).

9. The spiral demoulding structure of a medical instrument connector according to claim 8, wherein the movable groove (a) is communicated with the forming cavity, movable columns (821) are arranged on the centers of the gears (820) in an extending mode towards two sides, and the internal thread forming head (822) is connected below the movable columns (821).

10. The spiral demoulding structure of the medical instrument connector according to claim 9, wherein a limiting sleeve (830) is connected to the movable column (821) above the gear (820) in a threaded mode, and the limiting sleeve (830) is fixed in the movable groove (a) to limit the gear (820).