CN214448190U

CN214448190U - Exhaust mechanism for injection mold

Info

Publication number: CN214448190U
Application number: CN202022828724.9U
Authority: CN
Inventors: 甘友平
Original assignee: Hebei Qianyuan Plastic Products Co ltd
Current assignee: Hebei Qianyuan plastic products Co.,Ltd.
Priority date: 2020-12-01
Filing date: 2020-12-01
Publication date: 2021-10-22
Anticipated expiration: 2030-12-01

Abstract

The utility model discloses an exhaust mechanism for an injection mold, which comprises a template and a supporting plate, wherein a mold cavity is formed between the template and the supporting plate, the template is provided with an exhaust hole, the lower end of the exhaust hole is provided with a round platform-shaped hole, a valve core is arranged in the hole, the lower part of the valve core is provided with a bottom plate, the horizontal cross section of the bottom plate is the same as the horizontal cross section of the lower end of the exhaust hole, the bottom plate is provided with a plurality of through holes, the lower side of the valve core is provided with a fixed column vertical to the horizontal plane corresponding to the through hole, the horizontal cross section of the through hole is isosceles trapezoid, the upper end is large, the lower end is small, the inner diameter of the lower end of the through hole is equal to the outer diameter of the fixed column, and the thickness of the bottom plate is equal to the length of the fixed column, the design of the hole on the bottom plate and the fixed column on the valve core utilizes the liquidity of a melt to be larger than gas, the exhaust hole is automatically closed, the structure is simple, and the practicability is strong, the product is prevented from producing flash.

Description

Exhaust mechanism for injection mold

Technical Field

The utility model relates to an injection mold technical field specifically is an exhaust mechanism for injection mold.

Background

From a spatial perspective, an injection mold is a displacement device that displaces the original air and other gases within the mold cavity as the plastic melt is injected into the mold cavity. The gas in the injection mold comprises not only the air in the casting system and the cavity, but also the decomposition gas generated by the plastic melt, and water vapor generated by the moisture in the plastic at high temperature. During injection molding, the high-temperature plastic melt drives the gases and compresses the gases to dead corners to form a plurality of high-temperature high-pressure air chambers, the counter pressure formed by the high-pressure air chambers prevents the melt from being filled normally and quickly, and meanwhile, the high-temperature high-pressure air chambers penetrate into the melt to cause insufficient filling, so that the defects of air holes, cavities, loose tissues and the like are generated in the injection molding part. Therefore, during the injection molding process, these gases must be exhausted out of the mold in a timely manner.

In most cases, various gases can be discharged through a parting surface, an inlaying gap and a top rod gap of the mold, but the gases at the tail end of the flowing melt, the junction of a plurality of strands of melts, the bottom of a blind hole of the cavity, the bottom of a reinforcing rib and other dead corners of various complex cavities cannot be discharged, and the positions are often ignored during mold design. The traditional method is to reduce the injection speed, so that the melt is slowly pushed, and the time is left for gas to be exhausted. However, not only the molding cycle is prolonged, but also the temperature of the melt is rapidly reduced, and at this time, the injection molding pressure needs to be increased, so that the residual stress is increased, and the problems that the plastic part is easy to warp and deform after being demolded, and the like, are caused. Therefore, the utility model provides an exhaust mechanism for injection mold to solve the problem that proposes among the above-mentioned background art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an exhaust mechanism for injection mold to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

an exhaust mechanism for an injection mold comprises a template and a supporting plate, wherein a mold cavity is formed between the template and the supporting plate, an exhaust hole is formed in the template, a circular truncated cone-shaped hole is formed in the lower end of the exhaust hole, a valve core is arranged in the hole, and a bottom plate is arranged below the valve core;

the upper side of the valve core is connected with a connecting column, a gap between the connecting column and the exhaust hole forms an air passage, the upper side of the air passage is communicated with an exhaust port on the right side, the upper end of the connecting column is provided with a sliding sealing ring, the sealing ring is matched with a sealing gasket on the upper end of a template to seal the upper end of the exhaust hole, the connecting column and the valve core are in sliding connection with a plurality of vertical transmission columns, the lower ends of the transmission columns are fixed on the upper side of a bottom plate, the upper ends of the transmission columns are connected with a top plate, a spring is arranged between the top plate and the template, the top plate and the exhaust port are both positioned in an outer cover which is detachably mounted, the upper end of the exhaust hole is provided with a filter block to prevent external dust from entering the exhaust hole, the outer side of the connecting column is fixed with a sliding ring, the left side of the sliding ring is fixed with a pressure rod, the left end of the pressure rod is movably connected in the template through a torsion spring, and the upper end of the pressure rod is clamped with a clamping tongue, the latch tongue is fixed on the lower side of the top plate.

As a further proposal of the utility model, the horizontal section of the bottom plate is the same as the horizontal section of the lower end of the exhaust hole.

As the utility model discloses scheme further still, be equipped with a plurality of through-holes on the bottom plate, the position that the downside of case corresponds the through-hole all is equipped with the fixed column of perpendicular to horizontal plane, and the horizontal cross-section of through-hole is isosceles trapezoid, and the big lower extreme in upper end is little, and the lower extreme internal diameter of through-hole equals the external diameter of fixed column, and the thickness of end plate equals the length of fixed column for the bottom plate can be wrapped the lower extreme in exhaust hole completely and is plugged up during the compound die.

As the utility model discloses scheme further again, the middle part downside of case is fixed with the round platform, is equipped with the hole that matches with the round platform on the bottom plate, and the height of round platform equals the bottom plate thickness.

As a still further aspect of the present invention, the middle lower portion of the transmission rod is fixed with a projection, a lower side of the projection is inclined toward the upper right, the outer side of the transmission rod is provided with a guide groove, and the transmission rod is inclined toward the upper left.

As the utility model discloses scheme further again, the block tongue includes montant and horizontal pole, and the horizontal pole top left side slope sets up, and the left downside of horizontal pole and the upper right side of transfer line all incline towards the left side, can block automatically when pressing the roof.

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

the utility model discloses a through-hole on the bottom plate and the design of the fixed post on the case utilize the mobility of fuse-element to be greater than gaseous, carry out self-closing to the exhaust hole, simple structure, the practicality is strong, can not only effectively get rid of the gas in the injection mold, reduces the flow resistance of plastic fuse-element, improves the shaping qualification rate of product, still can shorten the injection moulding cycle.

Drawings

Fig. 1 is a schematic structural view of an exhaust mechanism for an injection mold.

Fig. 2 is an enlarged schematic view of a in fig. 1.

Fig. 3 is an enlarged structural diagram of B in fig. 1.

Fig. 4 is a schematic perspective view of a transmission rod in an exhaust mechanism for an injection mold.

In the figure: 1. a support plate; 2. a mold cavity; 3. a template; 4. an exhaust hole; 5. a valve core; 6. a base plate; 7. fixing a column; 8. a through hole; 9. connecting columns; 10. a top plate; 11. an airway; 12. an exhaust port; 13. a housing; 14. a spring; 15. a slip ring; 16. a transmission rod; 17. a latch; 18. a drive post.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 4, in an embodiment of the present invention, an exhaust mechanism for an injection mold includes a mold plate 3 and a support plate 1, a mold cavity 2 is formed between the mold plate 3 and the support plate 1, an exhaust hole 4 is formed on the mold plate 3, a hole in the shape of a circular truncated cone is formed at a lower end of the exhaust hole 4, a valve core 5 is disposed in the hole, a bottom plate 6 is disposed below the valve core 5, a horizontal cross section of the bottom plate 6 is identical to a horizontal cross section of a lower end of the exhaust hole 4, a plurality of through holes 8 are formed on the bottom plate 6, fixed posts 7 perpendicular to a horizontal plane are disposed at positions of a lower side of the valve core 5 corresponding to the through holes 8, a horizontal cross section of the through holes 8 is in the shape of an isosceles trapezoid, an inner diameter of a lower end of each through hole 8 is equal to an outer diameter of each fixed post 7, a thickness of the bottom plate 6 is equal to a length of each fixed post 7, so that the bottom plate 6 can completely enclose the exhaust hole 4 when the mold is closed, a circular truncated cone is fixed at a lower side of a middle portion of the valve core 5, a hole matched with the circular truncated cone is formed in the bottom plate 6, and the height of the circular truncated cone is equal to the thickness of the bottom plate 6;

the upper side of the valve core 5 is connected with a connecting column 9, a gap between the connecting column 9 and the exhaust hole 4 forms an air passage 11, the upper side of the air passage 11 is communicated with an exhaust port 12 on the right side, the upper end of the connecting column 9 is provided with a sliding sealing ring, the sealing ring is matched with a sealing gasket on the upper end of the template 3 to seal the upper end of the exhaust hole 4, the connecting column 9 and the valve core 5 are connected with a plurality of vertical transmission columns 18 in a sliding way, the lower ends of the transmission columns 18 are fixed on the upper side of the bottom plate 6, the upper ends of the transmission columns 18 are connected with a top plate 10, a spring 14 is arranged between the top plate 10 and the template 3, the top plate 10 and the exhaust port 12 are both positioned in an outer cover 13, the outer cover 13 is detachably mounted, the upper end of the exhaust port 12 is provided with a filter block to prevent external dust from entering the exhaust port 12, the outer side of the connecting column 9 is fixed with a sliding ring 15, the left side of the sliding ring 15 is fixed with a compression bar, and the left end of the compression bar is movably connected with a transmission bar 16, the lower extreme of transfer line 16 passes through the torsional spring and rotates to be connected in template 3, and the upper end joint of transfer line 16 has block tongue 17, and block tongue 17 fixes the downside at roof 10, the well lower part of transfer line 16 is fixed with the lug, and the downside of lug inclines towards upper right, and the outside of transfer line 16 is equipped with the guide way, and transfer line 16 inclines towards upper left, block tongue 17 includes montant and horizontal pole, and the horizontal pole inclines to the upper left and sets up, and the upper right side of the left downside of horizontal pole and transfer line 16 all inclines towards the left side, can block automatically when pressing roof 10.

The utility model discloses a theory of operation is: when the automatic exhaust valve is used, the valve core 5 is in an open state under the action of the clamping tongue 17 and the transmission rod 16, the mold cavity 2 is communicated with the air passage 11, when a plastic melt is pushed, various gases are exhausted from the air passage 11 through the exhaust port 12, the purpose of automatic exhaust is achieved, when the plastic melt reaches the bottom plate 6, the bottom plate 6 moves upwards under the pressure of the plastic melt, the fixing column 7 is driven to be inserted into the through hole 8, the pressure is transmitted to the valve core 5, the valve core 5 moves upwards to block a gap between the exhaust hole 4 and the air passage 11, the valve core 5 drives the connecting column 9 to move upwards, the sliding ring 15 drives the pressing rod to slide on the convex block, the torsion force of the torsion spring is resisted, the transmission rod 16 is driven to rotate anticlockwise, the clamping tongue 17 is unlocked, the top plate 10 rapidly moves upwards under the action of the spring 14, the bottom plate 6 is driven to press the valve core 5 through the transmission column 18, and the exhaust hole 6 and the exhaust hole 4 of the bottom plate are completely blocked, the product is prevented from producing flash.

The utility model discloses a through-hole 8 on the bottom plate 6 and the design of fixed column 7 on the case 5 utilize the mobility of fuse-element to be greater than gaseous, carry out self-closing to exhaust hole 4, simple structure can not only effectively get rid of the gas among the injection mold, reduces the flow resistance of plastic fuse-element, improves the shaping qualification rate of product, still can shorten the injection moulding cycle.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. An exhaust mechanism for an injection mold comprises a template (3) and a support plate (1), and is characterized in that a mold cavity (2) is formed between the template (3) and the support plate (1), an exhaust hole (4) is formed in the template (3), a circular truncated cone-shaped hole is formed in the lower end of the exhaust hole (4), a valve core (5) is arranged in the hole, and a bottom plate (6) is arranged below the valve core (5);

the upper side of the valve core (5) is connected with a connecting column (9), a gap between the connecting column (9) and the exhaust hole (4) forms an air passage (11), the upper side of the air passage (11) is communicated with an exhaust port (12) on the right side, the upper end of the connecting column (9) is provided with a sliding sealing ring, the sealing ring is matched with a sealing gasket at the upper end of the template (3) to seal the upper end of the exhaust hole (4), the connecting column (9) and the valve core (5) are connected with a plurality of vertical transmission columns (18) in a sliding mode, the lower ends of the transmission columns (18) are fixed at the upper side of the bottom plate (6), the upper ends of the transmission columns (18) are connected with a top plate (10), a spring (14) is arranged between the top plate (10) and the template (3), the top plate (10) and the exhaust port (12) are both positioned in an outer cover (13), the outer cover (13) is detachably mounted, the upper end of the exhaust port (12) is provided with a filter block, the outer side of the connecting column (9) is fixedly provided with a sliding ring (15), a pressure lever is fixed on the left side of the slip ring (15), a transmission rod (16) is movably connected to the left end of the pressure lever, the lower end of the transmission rod (16) is rotatably connected into the template (3) through a torsion spring, a clamping tongue (17) is clamped at the upper end of the transmission rod (16), and the clamping tongue (17) is fixed on the lower side of the top plate (10).

2. An exhaust mechanism for an injection mold according to claim 1, wherein the horizontal cross section of the bottom plate (6) is the same as the horizontal cross section of the lower end of the exhaust hole (4).

3. The exhaust mechanism for the injection mold according to claim 1, characterized in that a plurality of through holes (8) are formed in the bottom plate (6), fixing columns (7) perpendicular to a horizontal plane are arranged at positions, corresponding to the through holes (8), on the lower side of the valve core (5), the horizontal cross sections of the through holes (8) are isosceles trapezoids, the upper ends of the through holes are larger than the lower ends of the through holes, the inner diameters of the lower ends of the through holes (8) are equal to the outer diameters of the fixing columns (7), and the thickness of the bottom plate (6) is equal to the length of the fixing columns (7).

4. The exhaust mechanism for the injection mold according to claim 1, wherein a circular truncated cone is fixed on the lower side of the middle part of the valve core (5), a hole matched with the circular truncated cone is formed in the bottom plate (6), and the height of the circular truncated cone is equal to the thickness of the bottom plate (6).

5. An exhaust mechanism for an injection mold according to claim 1, wherein a protrusion is fixed to a lower middle portion of the driving rod (16), a lower side of the protrusion is inclined toward an upper right, a guide groove is provided to an outer side of the driving rod (16), and the driving rod (16) is inclined toward an upper left.

6. An exhaust mechanism for injection molds according to claim 1, characterized in that the latch (17) comprises a vertical bar and a horizontal bar, the horizontal bar is disposed inclined to the upper left, and the lower left side of the horizontal bar and the upper right side of the transmission bar (16) are both inclined to the left.