CN210940336U

CN210940336U - Pin plug type side-blown demoulding mechanism

Info

Publication number: CN210940336U
Application number: CN201921003961.2U
Authority: CN
Inventors: 郭秋盛; 郭秋波
Original assignee: Jinhua Lisheng Plastic Mould Co ltd
Current assignee: Jinhua Lisheng Plastic Mould Co ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2020-07-07
Anticipated expiration: 2029-06-28

Abstract

The utility model provides a pin plug type side-blown demoulding mechanism, which comprises a core formed on a movable mould, wherein the core is of an integrated structure, at least one side-blown hole is formed in the side part of the core, a pin plug is detachably arranged in the side-blown hole, an air gap is formed between the pin plug and the side-blown hole, and the side-blown hole is communicated with a corresponding airflow channel; the pin plug is provided with a through positioning hole, the axial direction of the positioning hole is consistent with the height direction of the core, the upper side and the lower side of the side blowing hole in the core are respectively provided with a pin hole and a thimble hole, the pin hole upwards extends through the upper end face of the core, the thimble hole downwards extends through the lower end face of the movable die, the positioning hole, the pin hole and the thimble hole are coaxially arranged, and the positioning pin is arranged in the pin hole and downwards extends into the positioning hole to fix the pin plug. The utility model discloses can effectively solve the deep chamber class injection moulding drawing of patterns difficulty of thin wall, manufacturing cost is high, the unable problem of guaranteeing of quality.

Description

Pin plug type side-blown demoulding mechanism

Technical Field

The utility model belongs to the technical field of injection mold, in particular to round pin stopper formula side-blown demoulding mechanism.

Background

The injection mold is widely applied to the production and manufacture of plastic products, the injection products need to be demolded under the action of a demolding mechanism after being cooled and formed, the demolding mechanism adopted at present is a push plate and an ejector rod, however, for the injection molding products with thin walls and deep cavities, the thin walls are easy to damage, the adsorption force of the injection molding products on the mold core is large, the demolding is difficult, if the ejecting mechanism is adopted for demolding, the injection molding products are easy to damage, and in order to be able to fully eject the injection molded article out of the core, the height of the mold feet is generally required to be greater than the depth of the article, so as to meet the requirement of the ejection stroke, the steel consumption of the die, the processing difficulty and the processing cost are increased, meanwhile, the working stroke required by opening and closing the mold is lengthened, and the injection pressure of the thin-wall product is large, so that an injection molding machine with large-tonnage mold clamping force is required to carry out matched injection molding, and the injection molding process of the thin-wall deep-cavity product has the disadvantages of large energy consumption, low efficiency and high defective rate.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a round pin stopper formula side-blown demoulding mechanism to the problem that present thin wall deep cavity class injection moulding demoulding difficulty, manufacturing cost is high, the unable assurance of quality.

The purpose of the utility model can be realized by the following technical proposal:

the pin plug type side-blowing demoulding mechanism comprises a core formed in a movable mould, and is characterized in that the core is of an integrated structure, at least one side-blowing hole is formed in the side part of the core, a pin plug is detachably mounted in the side-blowing hole, an air passing gap is formed in a mounting gap between the pin plug and the side-blowing hole, the side-blowing hole is communicated with a corresponding air flow channel, and the air flow channel is formed in the core; the pin plug is provided with a through positioning hole, the axial direction of the positioning hole is consistent with the height direction of the core, the upper side and the lower side of the side blowing hole in the core are respectively provided with a pin hole and an ejector pin hole, the pin hole upwards extends through the upper end face of the core, the ejector pin hole downwards extends through the lower end face of the movable die, the positioning hole, the pin hole and the ejector pin hole are coaxially arranged, a positioning pin is arranged in the pin hole and downwards extends into the positioning hole to fix the pin plug, compressed gas can blow gas to the side wall of the thin-wall injection molding product through the arrangement of the side blowing hole, so that an air layer is formed between the injection molding product and the core, the demolding of the injection molding product is facilitated, the air pressure of the compressed gas can be adjusted according to the shape and the wall thickness of the; the arrangement of the pin hole and the thimble hole can effectively solve the problems of installation, fixation, disassembly and replacement of the pin plug on the premise of not damaging the integrity of the core, the locating pin arranged in the pin hole can fix the pin plug to prevent the pin plug from loosening and falling off under the action of compressed gas, when the pin plug needs to be disassembled and replaced, the locating pin is firstly taken down, then the thimble is stretched into the pin hole from the lower end of the thimble hole, the pin plug is pulled out by the thimble, and the air output of the side blowing hole can be adjusted by replacing the pin plugs with different sizes; core formula structure as an organic whole processing is convenient, can effectively avoid the problem that the cooling water course leaks and the movable mould fracture, extension mould life to can guarantee the structure steadiness of core, improve injection moulding's outward appearance quality, avoid producing too much impression of moulding plastics.

Preferably, the top of the mold core is provided with at least one air top hole, an air injection valve is installed in the air top hole, and the air top hole is communicated with the corresponding air flow channel. For the thin-wall deep-cavity injection molding product with the top wall, the air top hole can blow air to the top wall, and demolding of the injection molding product is facilitated.

Preferably, the side blowing hole is a gradually expanded hole, and the hole diameter of the side blowing hole is gradually increased from the air inlet end to the air outlet end. The side blow hole is set to be gradually reamed, so that the pin plug is convenient to install and detach.

Preferably, the pin plug is of a cylindrical structure and is provided with a first end face, a second end face and an annular side wall, wherein the annular side wall is adapted to the inner wall of the side blowing hole, and the first end face is located at the air outlet end of the side blowing hole and matched with the side forming face of the mold core to form an auxiliary forming face. So as to improve the integrity of the side forming surface and ensure the appearance quality of the injection molding product.

Preferably, the second end surface is positioned at the air inlet end of the side blowing hole, and the outer edge of the second end surface is provided with a circular arc chamfer. The arc-shaped chamfer can effectively avoid stress concentration and ensure the smoothness of the outlet of the compressed gas.

Preferably, an annular groove is formed in the annular side wall of the pin plug along the circumferential direction, and the annular groove is arranged close to the first end face. The annular groove can prevent the mold core and the pin plug from being unsmooth in air outlet caused by thermal expansion.

Preferably, the annular side wall of the pin plug is provided with an air guide groove along the axial direction of the pin plug, and the air guide groove extends into the annular groove from the outer edge of the second end face. The arrangement of the air guide groove can ensure smooth air outlet of the side blowing hole, and the phenomenon that the mold core and the pin plug are locked after being heated and expanded to block the circulation of compressed air is avoided; and the air guide groove is communicated with the annular groove, so that compressed air can be redistributed in the annular groove, and is uniformly blown to the injection molding product along the peripheral surface of the pin plug, the demolding effect is better, and the injection molding product is prevented from being damaged by the compressed air.

Preferably, a plurality of vertical cooling water channels are formed in the mold core at intervals, and the axial direction of each vertical cooling water channel is consistent with the axial direction of the corresponding air flow channel and is arranged along the height direction of the mold core. The vertical cooling water channel is consistent with the axial direction of the airflow channel, the cooling stroke of cooling water can be increased, the cooling water channel can effectively avoid the airflow channel, the core is internally provided with enough opening space to ensure the opening quantity of the cooling water channel, the cooling effect is ensured, and the quality of the plastic part is improved.

Preferably, the lower end surface of the movable mold is provided with a horizontal cooling water channel, and the vertical cooling water channel extends downwards to be communicated with the horizontal cooling water channel. The cooling effect can be further improved by the aid of the arrangement, a plurality of vertical cooling water channels can be communicated into a through water channel, the cooling effect is improved, and the cooling water channel is conveniently communicated with an external water channel.

Preferably, safe intervals are set between the vertical cooling water channels and the airflow channel, and the safe intervals are larger than 6 mm. Because the cooling water channel needs to be cleaned by strong acid regularly, the safety interval of more than 6mm can effectively avoid the perforation of the cooling water channel and ensure the structural strength of the mold core.

Preferably, the number of the air top holes is two, the air top holes are symmetrically formed in the top of the core, the number of the side blowing holes is two, the side blowing holes are symmetrically formed in the side portion of the core, and the air flow channels communicated with the air top holes and the side blowing holes are uniformly distributed at positions close to a forming surface of the side portion of the core along the circumferential direction of the core. The arrangement can improve the demoulding effect of the injection molding product, can provide enough space for the cooling water channel, and is convenient for manufacturing and processing the mould.

Compared with the prior art, the utility model has the advantages that the demoulding effect of the thin-wall deep-cavity injection molding product can be effectively improved through the matching of the pin plug and the side blowing hole; the pin plug is convenient to install and disassemble, and the integral structure of the mold core is not damaged; the pin plug has reasonable structural design, and can ensure smooth and uniform air outlet in a high-temperature environment, thereby ensuring the demolding effect and the product quality; core formula structure as an organic whole, airflow channel and cooling water course distribute rationally effectively, can guarantee drawing of patterns effect and cooling effect when guaranteeing core structural strength to improve the injection moulding product quality, extension mould life.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a bottom view of the present invention;

FIG. 3 is a cross-sectional view taken along plane A-A of FIG. 2;

FIG. 4 is a schematic view of the structure of the middle pin plug of the present invention;

FIG. 5 is another schematic structural view of the pin plug of the present invention;

in the figure, a core 10; a side blow hole 11; a gas top hole 12; an airflow passage 13; a pin hole 14; a thimble hole 15; a pin plug 20; a positioning hole 21; a first end face 22; a second end surface 23; an annular groove 24; a gas guiding groove 25; a vertical cooling water channel 31; horizontal cooling channels 32.

Detailed Description

The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

Referring to fig. 1 to 5, the present embodiment discloses a pin plug type side-blown demolding mechanism, which includes a movable mold and a core 10 formed on the movable mold, in the present embodiment, the core 10 is used for forming a lunch box, the lunch box is a thin-wall deep-cavity type injection molding product, the core 10 is an integrated structure, two side-blown holes 11 are symmetrically formed on a side portion of the core 10, the side-blown holes 11 are disposed near an upper end surface of the core 10, pin plugs 20 are detachably mounted in the side-blown holes 11, an air passing gap is formed between the pin plugs 20 and the side-blown holes 11, the two side-blown holes 11 are respectively communicated with corresponding air flow channels 13, the two air flow channels 13 are formed inside the core 10, and an axial direction of the two air flow channels is consistent with a height direction of the core 10 when a mold is closed, a height direction of the core 10 in the present embodiment refers to a moving direction of the core 10, the pin plug 20 is matched with the side blowing hole 11 to blow air to the side wall of the lunch box, so that an air layer is formed between the side wall of the lunch box and the surface of the side core 10, and the demoulding of the lunch box is facilitated; in order to further improve the demolding effect and facilitate demolding of the lunch box, two air top holes 12 are symmetrically formed in the top of the mold core 10, air injection valves are installed in the air top holes 12, the type of the air injection valve in the embodiment is C-AJVSS6-12, the outer diameter of the air injection valve is 6mm, the air injection valve is made of stainless steel and comprises a body, a piston rod, a spring and an elastic cotter pin, and the air top holes 12 are respectively communicated with corresponding air flow channels 13; four airflow channel 13 that communicate with gas cap hole 12 and side-blown hole 11 respectively along the even distribution in the position that is close to core 10 lateral part shaping face of circumference of core 10 to communicate with main air duct, main air duct and outside compressed gas source intercommunication, it can make to produce even air bed between cutlery box and the core 10 to set up above, guarantee the drawing of patterns effect of cutlery box, reduce the defective percentage because of the drawing of patterns causes, and can provide sufficient space for the cooling water course, be convenient for mould manufacturing.

The pin plug 20 is provided with a through positioning hole 21, the axial direction of the positioning hole 21 is consistent with the height direction of the core 10, the core 10 is internally provided with a pin hole 14 and an ejector pin hole 15 at the upper side and the lower side of the side blowing hole 11 respectively, the pin hole 14 extends upwards to penetrate through the upper end face of the core 10, the ejector pin hole 15 extends downwards to penetrate through the lower end face of the movable die, the positioning hole 21, the pin hole 14 and the ejector pin hole 15 are coaxially arranged, the pin hole 14 is a stepped hole, a positioning pin is arranged in the pin hole 14 and extends downwards to the positioning hole 21 to fix the pin plug 20, the pin hole 14 and the ejector pin hole 15 can effectively solve the problems of installation, fixation, disassembly and replacement of the pin plug 20 on the premise of not damaging the integrity of the core 10, the positioning pin arranged in the pin hole 14 can fix the pin plug 20 to prevent the pin plug 20 from loosening and falling off under the action of compressed gas, and when the pin plug 20 needs, the positioning pin is taken down firstly, then the thimble is extended into the lower end of the thimble hole 15, the thimble plug 20 is pulled out by the thimble, and the blowing amount of the side blowing hole 11 can be adjusted by replacing the thimble plugs 20 with different sizes.

The side blowing hole 11 is a gradually-enlarged hole, the hole diameter of the side blowing hole is gradually enlarged from the air inlet end to the air outlet end, the side blowing hole 11 is gradually enlarged, the installation and the disassembly of the pin plug 20 are facilitated, and a blocking edge is formed on one side close to the air outlet end, so that the installation of the pin plug 20 is facilitated, and the assembly accuracy is improved; the pin plug 20 is of a cylindrical structure, the pin plug 20 is of a cylindrical structure and is provided with a first end surface 22, a second end surface 23 and an annular side wall, the annular side wall is matched with the inner wall of the side blowing hole 11, the first end surface 22 is positioned at the air outlet end of the side blowing hole 11 and is matched with the side molding surface of the core 10 to form an auxiliary molding surface, and the first end surface 22 is positioned at the air outlet end of the side blowing hole 11 and is matched with the side molding surface of the core 10 to form the auxiliary molding surface, so that the integrity and the finish of the side molding surface are improved, and the appearance quality of an injection molding product is ensured; the second end face 23 is located at the air inlet end of the side blowing hole 11, and an arc-shaped chamfer is formed at the outer edge of the second end face 23, so that stress concentration can be effectively avoided, the mounting stability of the pin plug 20 is improved, and smooth air outlet of compressed air is ensured; an annular groove 24 is formed in the annular side wall of the pin plug 20 along the circumferential direction, the annular grooves 24 are arranged close to the first end face 22, further, two air guide grooves 25 are further formed in the annular side wall of the pin plug 20 along the axial direction of the pin plug 20, the two air guide grooves 25 are symmetrically formed, the air guide grooves 25 extend into the annular groove 24 from the outer edge of the second end face 23, the arrangement of the annular grooves 24 and the air guide grooves 25 can ensure smooth air outlet of the side blowing holes 11, the phenomenon that the mold core and the pin plug 20 are locked after being heated and expanded and the circulation of compressed air is blocked is avoided, the air guide grooves 25 are communicated with the annular grooves 24, the compressed air can be redistributed in the annular grooves 24, the injection molded products are uniformly blown to the outer peripheral face of the pin plug 20, the demolding effect is better, and the phenomenon that the injection molded products are damaged due to excessive air pressure of the compressed air; in this embodiment, the pin plug 20 and the pin are made of the same material as the core 10, so as to ensure that the pin plug 20 and the pin have the same coefficient of expansion with heat and contraction with cold, and improve the degree of matching between the pin plug 20 and the core 10.

A plurality of vertical cooling water channels 31 are formed in the mold core 10 at intervals, the axial direction of each vertical cooling water channel 31 is consistent with the axial direction of the corresponding air flow channel 13 and is arranged along the height direction of the mold core 10, an annular water channel is horizontally arranged on the upper end face of the movable mold, the cooling water channels extend downwards and are communicated with the annular water channels, a water-isolating piece is arranged in each cooling water channel along the axial direction of the cooling water channel and divides the cooling water channel into a water inlet channel and a water outlet channel, so that the cooling stroke of the straight pipe water channel and the cooling water is increased, the cooling water channels can avoid the air flow channels 13, enough space is formed in the mold core 10 to ensure the arrangement number of the cooling water channels, the cooling effect is ensured, the quality of an injection molding product is improved, the annular water channels formed on the lower end face of the movable mold can further improve the cooling effect, and the plurality of cooling water channels, the cooling efficiency is improved, and the cooling device is conveniently communicated with an external water supply device; because the injection pressure of the thin-wall deep-cavity injection molding product is high, and the upper end surface of the mold core 10 is a main pressure-bearing part, the structural strength of the mold core 10 is considered while the depth of the cooling water channel is increased to improve the cooling effect, and the reserved distance between the upper end surface of the cooling water channel and the upper end surface of the mold core 10 is larger than 9mm, wherein the reserved distance is 10mm in the embodiment; since the cooling water channel needs to be cleaned regularly with strong acid, a safety space of at least 6mm is provided between the cooling water channel and the airflow channel 13 in order to avoid perforation; the setting of reserving interval and safe interval is when guaranteeing cooling water course cooling effect, has still guaranteed the structural strength of core 10 to effectively solve the problem that the cooling water course leaks and the movable mould ftractures, extension mould life, core 10 of integral type structure is than split type core 10 structure steadiness and dimensional accuracy higher, thereby improves injection moulding's outward appearance quality, avoids producing too much impression of moulding plastics.

The utility model discloses a round pin stopper formula side-blown demoulding mechanism can effectively solve the difficult problem of the drawing of patterns of the dark chamber class injection moulding of thin wall, and core 10 formula structure as an organic whole, airflow channel 13 is rationally distributed effectively with the cooling water course, can guarantee drawing of patterns effect and cooling effect when guaranteeing core 10 structural strength, thereby improve the injection moulding quality, extension mould life, round pin stopper 20 structural design is reasonable, the installation is dismantled conveniently, can guarantee under high temperature environment that it is smooth and easy even to give vent to anger, thereby guarantee drawing of patterns effect and product quality.

It is to be understood that in the claims, the specification of the present invention, all "including … …" are to be interpreted in an open-ended manner, i.e., in a manner equivalent to "including at least … …", and not in a closed manner, i.e., in a manner not to be interpreted as "including only … …". The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

The above description is only the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and those skilled in the art should be able to make changes, modifications, additions or substitutions within the scope of the present invention.

Claims

1. The pin plug type side-blowing demoulding mechanism comprises a core (10) formed on a movable mould, and is characterized in that the core (10) is of an integrated structure, at least one side-blowing hole (11) is formed in the side part of the core (10), a pin plug (20) is detachably mounted in the side-blowing hole (11), an air passing gap is formed in a mounting gap between the pin plug (20) and the side-blowing hole (11), the side-blowing hole (11) is communicated with a corresponding air flow channel (13), and the air flow channel (13) is formed in the core (10); the novel core mold is characterized in that a through positioning hole (21) is formed in the pin plug (20), the axial direction of the positioning hole (21) is consistent with the height direction of the core (10), a pin hole (14) and a top pin hole (15) are formed in the upper side and the lower side of the side blowing hole (11) in the core (10) respectively, the pin hole (14) extends upwards to penetrate through the upper end face of the core (10), the top pin hole (15) extends downwards to penetrate through the lower end face of the movable mold, the positioning hole (21), the pin hole (14) and the top pin hole (15) are coaxially arranged, a positioning pin is installed in the pin hole (14) and extends downwards to the positioning hole (21), and the pin plug (20) is fixed.

2. A pin plug type side-blown stripper mechanism according to claim 1, wherein the side-blown hole (11) is a gradually enlarged hole whose diameter gradually increases from the inlet end to the outlet end.

3. A pin plug type side-blown stripper mechanism according to claim 2, wherein the pin plug (20) is a cylindrical structure having a first end surface (22), a second end surface (23) and an annular side wall, wherein the annular side wall is adapted to the inner wall of the side-blown hole (11), and the first end surface (22) is located at the air outlet end of the side-blown hole (11) and matches with the side molding surface of the core (10) to form an auxiliary molding surface.

4. A pin-plug side-blown stripper mechanism according to claim 3, characterized in that the second end surface (23) is located at the air inlet end of the side-blown bore (11), the outer edge of the second end surface (23) being formed with a rounded chamfer.

5. A pin plug side-blown stripper mechanism according to claim 3 or 4, wherein the annular side wall of the pin plug (20) is circumferentially provided with an annular groove (24), the annular groove (24) being arranged adjacent to the first end face (22).

6. The pin plug type side-blown stripper mechanism according to claim 5, wherein the annular side wall of the pin plug (20) is provided with an air guide groove (25) along the axial direction of the pin plug (20), and the air guide groove (25) extends from the outer edge of the second end surface (23) to the annular groove (24).

7. The pin plug type side-blown demolding mechanism according to any one of claims 1 to 4, wherein at least one air top hole (12) is formed in the top of the mold core (10), an air injection valve is installed in the air top hole (12), and the air top hole (12) is communicated with the corresponding air flow channel (13).

8. The pin plug type side-blown demoulding mechanism according to claim 7, wherein the number of the air top holes (12) is two, the air top holes are symmetrically formed at the top of the core (10), the number of the side-blown holes (11) is two, the air side-blown holes are symmetrically formed at the side part of the core (10), and the air flow channels (13) respectively communicated with the air top holes (12) and the side-blown holes (11) are uniformly distributed at positions close to the side part forming surface of the core (10) along the circumferential direction of the core (10).

9. The pin plug type side-blown demolding mechanism according to claim 8, wherein a plurality of vertical cooling water channels (31) are formed in the mold core (10) at intervals, and the axial directions of the vertical cooling water channels (31) are consistent with the axial direction of the air flow channel (13) and are all opened along the height direction of the mold core (10); the lower end face of the movable mold is provided with a horizontal cooling water channel (32), and the vertical cooling water channel (31) extends downwards to be communicated with the horizontal cooling water channel (32).

10. A pin-plug side-blown stripper mechanism according to claim 9, wherein a safety clearance is set between the vertical cooling water channels (31) and the air flow channel (13), said safety clearance being greater than 6 mm.