CN108859031B

CN108859031B - Direct-ejection forced-stripping secondary ejection mechanism of injection mold

Info

Publication number: CN108859031B
Application number: CN201810584553.4A
Authority: CN
Inventors: 金欢; 胡迪; 金伟; 王一栋; 应可国
Original assignee: Ningbo Fangzheng Tool Co Ltd
Current assignee: Ningbo Fangzheng Tool Co Ltd
Priority date: 2016-08-31
Filing date: 2016-08-31
Publication date: 2020-07-14
Anticipated expiration: 2036-08-31
Also published as: CN106346704A; CN108859031A; CN106346704B

Abstract

The direct ejection and forced ejection secondary ejection mechanism comprises a movable die (1) and a fixed die (2), one end of the fixed die (2) is abutted to the movable die (1), the other end of the fixed die (2) is provided with a cushion die (3), the other end of the fixed die (2) is also provided with a groove (4), the groove (4) is internally connected with a top plate (5) in a sliding manner, the top plate (5) is provided with at least two reset rods (6) and at least two ejector rods (7), the cushion die (3) is provided with a step hole (13), a limiting rod (14) is arranged in the step hole (13), a first reset spring (15) is arranged between the direct ejection (11) and the cushion die (3), the first reset spring (15) is sleeved on the limiting rod (14), a reset mechanism is arranged between the top plate (5) and the cushion die (2), and the initial position of the top plate (5) is located on the bottom surface of the; compared with the prior art, the invention has the characteristics of relatively simple structure, good use stability, high production efficiency and low production cost.

Description

Direct-ejection forced-stripping secondary ejection mechanism of injection mold

Technical Field

The invention relates to a direct ejection and forced ejection secondary ejection mechanism for an injection mold.

Background

At present, in an injection mold, when a product has an inverted area, a pitched roof mechanism is often added. However, some products have limited space, and the inclined top is very troublesome to process and is not beneficial to the research and matching of a bench worker, and the conventional solution is to adopt the transverse demoulding of the inclined top. However, this structure requires high processing accuracy. The angle of the guide rod and the angle of the inclined top are required to be highly consistent, and high positioning requirements are also provided for the template, so that the cost is high, and the occupied space is large. When the inclined top is machined, workpieces matched with the inclined top, such as an abrasion-resistant block of the inclined top, quick guide of the inclined top and the like, can be machined. This structure has two drawbacks: firstly, the structure of the mechanism is too complex and the cost is too high; secondly, the mechanism is complex to process and is not beneficial to grinding and matching. And some other plastic products are because inside knot position is more, and it is strange because of the structure interference problem of plastic product moreover, traditional oblique top, slider can't satisfy the demolding many times, for example: the product V-shaped indent is internally provided with a buckling position, the ejection mechanism is required to be arranged on the fixed die, no space is provided for inclined ejection, the product is thin, the situation that the buckling position is pulled and cracked easily occurs when forced demoulding is directly arranged, the prior art adopts an insert to solve the problem, the production efficiency of the die is greatly reduced, and the production cost is relatively high.

Disclosure of Invention

Aiming at the problems, the invention provides the direct ejection forced-demoulding secondary ejection mechanism of the injection mould, which has the advantages of relatively simple structure, good use stability, high production efficiency and low production cost.

The technical scheme for solving the problems is as follows: the direct ejection forced demoulding secondary ejection mechanism comprises a movable mould and a fixed mould, one end of the fixed mould is abutted with the movable mould, cavity surfaces are arranged on the movable mould and the fixed mould, a cavity surface forming cavity is formed when the movable mould is abutted with the fixed mould, a cushion mould is arranged at the other end of the fixed mould, a groove is further formed at the other end of the fixed mould, a top plate is connected in the groove in a sliding mode, at least two reset rods and at least two ejector rods are arranged on the top plate, reset rod holes and ejector rod holes which respectively correspond to the reset rods and the ejector rods one to one are formed in the bottom surface of the groove, the free end face of each ejector rod is flush with the cavity surface of the fixed mould, the free end face of each reset rod is abutted with the movable mould, a straight ejection hole is further formed in the middle of the bottom surface of the groove, the reset rod holes and the ejector rod holes are uniformly distributed on two sides of the straight ejection hole, a straight, the cushion mould is provided with a stepped hole, a limiting rod is arranged in the stepped hole, one end of the straight top is positioned in the cavity, the other end of the straight top penetrates through a first through hole to be connected with one end of the limiting rod, the other end of the limiting rod is matched with a step in the stepped hole to limit the stroke of the straight top, a first reset spring is arranged between the straight top and the cushion mould, the first reset spring is sleeved on the limiting rod, the straight top is positioned at a lower limit position when the first reset spring is in a non-stressed state, a reset mechanism is arranged between the top plate and the cushion mould, and the initial position of the top plate is positioned at the bottom surface of the groove; the movable mould is equipped with the blind hole on just facing the position in reset lever hole, be equipped with the wear-resisting piece of reset lever in the blind hole, the diameter more than or equal to the diameter of the wear-resisting piece of reset lever, the free end terminal surface of reset lever and the wear-resisting piece of reset lever support to close.

After the structure is adopted, compared with the prior art, in the process of opening the die, when the movable die is opened, the relative positions of the top plate and the product and the movable die are kept unchanged under the action of the reset mechanism and the first reset spring, and the product is separated from the fixed die at the moment; when the movable die moves to the reverse buckle and is completely separated from the fixed die, the limiting rod is limited by the lower part of the step in the step hole, the follow-up die continues to move outwards at the moment, the straight top is limited and does not move, the relative positions of the top plate and the product with the movable die are still unchanged, the product is still pressed by the ejector rod, the straight top and the product are forcibly separated by means of the elasticity of the product until the top plate is attached to the bottom surface of the groove and limited, the ejector rod is separated from the product when the movable die continues to move outwards to the limiting position, and finally the product is ejected; the whole mechanism has relatively fewer parts, relatively simple structure and relatively small occupied space because the movement directions are the die opening directions, and the periphery of the inverted buckle is loose core when the product is forcibly taken off, so that the inverted buckle has an elastic deformation space, the ejector rod presses the product nearby the inverted buckle all the time, the product is not easy to deform or crack in the forcibly taking off process, the success rate of the forcible taking off is high, the use stability is good, and the production efficiency is high; the wear-resisting block can avoid the abrasion of the movable die after being arranged, and once the wear-resisting block is abraded, only the wear-resisting block needs to be replaced, so that the service life of the whole mechanism is prolonged, and meanwhile, the maintenance cost is reduced. Therefore, the invention has the characteristics of relatively simple structure, good use stability, high production efficiency and low production cost.

As an improvement, the other end of the straight top is connected with one end of a limiting rod through a connecting rod, the connecting rod is of a T-shaped structure, the first through hole is of a T-shaped structure matched with the connecting rod, the aperture of one end, close to the cushion mold, of the first through hole is larger than that of the other end of the first through hole, the axis of the first through hole and the axis of the straight top hole are on the same vertical line, one end of a first reset spring abuts against one end of the connecting rod, and the other end of the first reset spring abuts against one end of the cushion mold; after the arrangement, the limiting rod, the connecting rod and the straight top are convenient to install and process, the production cost can be reduced, after the limiting rod, the connecting rod or the straight top is abraded or damaged, only the corresponding part needs to be replaced, the connecting rod is maintained to be lower, the connecting rod of the T-shaped structure can reduce the abrasion condition of the limiting rod, the service life of the whole mechanism is prolonged, and the use cost is reduced.

As a further improvement, a reaming hole is arranged at one end, close to the connecting rod, of the straight top hole, the reaming hole is a round hole, and the diameter of the reaming hole is larger than the diameter of the end, connected with the straight top, of the connecting rod; after the arrangement, the connecting rod can be reamed and accommodated even if the connecting rod is longer, so that the processing precision of the connecting rod and the first through hole can be reduced, and the processing cost is reduced; and after the hole expansion is set, the contact area between the straight jack and the wall of the straight jack hole can be reduced, so that the friction force during the movement of the straight jack is reduced, the flexibility of the straight jack is improved, and the success rate of forced demoulding is ensured.

As a further improvement, the size of one end of the straight top close to the connecting rod is smaller than that of the other end of the straight top, the included angle between the side surface of the straight top and the central line is 0.2-2 degrees, and a small hole of the straight top hole is a wedge hole; the stepped hole is slightly larger than the limiting rod, and the first through hole is also slightly larger than the connecting rod; after then setting up like this, the stability of straight top is better behind the compound die, and the straight top is inseparabler with the laminating of straight top hole pore wall, be difficult for the overlap to appear in back-off department, improve the success rate of moulding plastics, simultaneously when the die sinking, the straight top has certain left and right sides rocking space again, make the straight top just appear not hard up condition with the face of product contact before taking off by force, and the straight top has certain lateral displacement again when taking off by force, make the elastic deformation of back-off when taking off by force littleer, can further improve the straight top success rate, the production efficiency is improved, further reduction in production cost.

As a further improvement, the reset mechanism comprises at least two guide rods, the axes of the guide rods are parallel to the axes of the limiting rods, second through holes corresponding to the guide rods one to one are formed in the top plate, one ends of the guide rods are connected with the second through holes in a sliding mode, the other ends of the guide rods are fixedly connected with the cushion molds, second reset springs are sleeved on the guide rods, one ends of the second reset springs are abutted to the top plate, and the other ends of the second reset springs are abutted to the cushion molds; the resetting mechanism has the advantages of fewer parts, simpler structure, lower preparation cost and better use stability.

As a further improvement, the guide rods are uniformly distributed on two sides of the limiting rod, counter bores corresponding to the guide rods one to one are arranged on the cushion die, threaded holes are formed in the bottoms of the counter bores, the other end of the guide rod is arranged on a threaded portion, the threaded portion is screwed with the threaded holes, and the other end of the second reset spring abuts against the bottoms of the counter bores; after then setting up like this, the stability of guide bar is better, and the structure of guide bar is simpler relatively, and the processing of being convenient for can further reduce the processing cost, and second reset spring's stability is also better, and the counter bore still makes second reset spring's length become longer simultaneously, and elasticity is just also bigger, and the power of the product that the ejector pin pushed down is just also bigger, makes the stability of product better when taking off by force, can further improve the success rate of taking off by force, thereby reduction in production cost.

As a further improvement, the aperture of one end of the reset rod hole close to the top plate is larger than that of the other end of the reset rod hole, and a sliding sleeve is arranged in a large hole of the reset rod hole; the diameter of one end of the ejector rod hole close to the top plate is larger than that of the other end of the ejector rod hole, and the length of a large hole of the ejector rod hole is larger than that of a small hole of the ejector rod hole; then the sliding sleeve sets up the back, and the release link is littleer at the in-process frictional force that slides for the flexibility of roof is better, thereby guarantees that whole mechanism's response is more accelerated, and then guarantees the stability of taking off by force.

Drawings

FIG. 1 is a schematic structural view of a straight ejection forced stripping secondary ejection mechanism of an injection mold.

Fig. 2 is a schematic structural diagram of the direct ejection forced-demoulding secondary ejection mechanism of the injection mould from mould opening to lower limit of the limiting rod.

FIG. 3 is a schematic structural diagram of the direct ejection forced-demoulding secondary ejection mechanism of the injection mould for limiting the position of the mould opening on the top plate.

FIG. 4 is a schematic structural view of the direct ejection forced-release secondary ejection mechanism of the injection mold when the mold is completely opened.

Shown in the figure: 1. the movable mould, 2, the cover half, 3, the cushion mould, 4, the recess, 5, the roof, 6, the release link, 7, the ejector pin, 8, the release link hole, 9, the ejector pin hole, 10, straight top hole, 11, straight top, 12, first through-hole, 13, the step hole, 14, the gag lever post, 15, first reset spring, 16, connecting rod, 17, the guide bar, 18, the second through-hole, 19, the second reset spring, 20, the counter bore, 21, the sliding sleeve, 22, the blind hole, 23, wear-resisting piece.

Detailed Description

The invention is further described with reference to the following drawings and detailed description.

Example one

As shown in fig. 1, 2, 3 and 4, a direct ejection forced demoulding secondary ejection mechanism for an injection mould comprises a movable mould 1 and a fixed mould 2, one end of the fixed mould 2 abuts against the movable mould 1, cavity surfaces are arranged on the movable mould 1 and the fixed mould 2, a cavity is formed on the cavity surface when the movable mould 1 abuts against the fixed mould 2, a cushion mould 3 is arranged at the other end of the fixed mould 2, a groove 4 is further arranged at the other end of the fixed mould 2, a top plate 5 is connected in the groove 4 in a sliding manner, at least two reset rods 6 (two in the embodiment, three, four, six or eight and the like) and at least two ejector rods 7 (two in the embodiment, three, four, six or eight and the like) are arranged on the top plate 5, reset rod holes 8 and ejector rod holes 9 which respectively correspond to the reset rods 6 and the ejector rods 7 one by one are arranged on the bottom surface of the groove 4, the free end surfaces of the ejector rods 7 are flush with the cavity, the free end face of the reset rod 6 is abutted against the movable die 1, the middle part of the bottom surface of the groove 4 is also provided with a straight top hole 10, a reset rod hole 8 and a top rod hole 9 are uniformly distributed at two sides of the straight top hole 10, a straight top 11 is slidably connected in the straight top hole 10, the middle part of the top plate 5 is provided with a first through hole 12, the cushion die 3 is provided with a step hole 13, the step hole 13 is internally provided with a limit rod 14, one end of the straight top 11 is positioned in a cavity, one side surface of the straight top 11 is a cavity surface, the other end of the straight top 11 penetrates through the first through hole 12 to be connected with one end of the limit rod 14, the other end of the limit rod 14 is matched with a step in the step hole 13 to limit the stroke of the straight top 11, a first reset spring 15 is arranged between the straight top 11 and the cushion die 3, one end of the step hole 13 close to the top plate 5 is provided with a hole, one end of the first reset spring 15 is abutted against, make first reset spring 15's length elongate like this, first reset spring 15 can provide bigger elasticity, guarantees roof 5's stability, and first reset spring 15 cup joints on gag lever post 14, and during first reset spring 15 atress state, directly pushes up 11 and is located lower limit position, directly pushes up 11 and is square structure, be equipped with canceling release mechanical system between roof 5 and the pad mould 3, the initial position of roof 5 is located the bottom surface of recess 4.

The other end of the vertical top 11 is connected with one end of a limiting rod 14 through a connecting rod 16, the connecting rod 16 is of a T-shaped structure, the first through hole 12 is of a T-shaped structure matched with the connecting rod 16, the aperture of one end, close to the cushion mold, of the first through hole 12 is larger than that of the other end of the first through hole 12, the axis of the first through hole 12 is on the same vertical line with the axis of the vertical top hole 10, one end of a first reset spring 15 is abutted to one end of the connecting rod 16, and the other end of the first reset spring 15 is abutted to one end of the cushion mold 3.

The straight top hole 10 is provided with a reaming hole near one end of the connecting rod 16, the reaming hole is a round hole, and the diameter of the reaming hole is larger than the diameter of the connecting end of the connecting rod 16 and the straight top 11.

The reset mechanism comprises at least two guide rods 17 (two guide rods 17 in this example, three, four, six or eight guide rods and the like), the axis of each guide rod 17 is parallel to the axis of the limiting rod 14, the top plate 5 is provided with second through holes 18 corresponding to the guide rods 17 one to one, one end of each guide rod 17 is in sliding connection with the corresponding second through hole 18, the other end of each guide rod 17 is fixedly connected with the cushion mold 3, the guide rods 17 are all sleeved with second reset springs 19, one ends of the second reset springs 19 are abutted to the top plate 5, and the other ends of the second reset springs 19 are abutted to the cushion mold 3.

The utility model discloses a set up mould, including cushion mould 3, guide bar 17 equipartition is in the gag lever post 14 both sides, be equipped with on the cushion mould 3 with the counter bore 20 of guide bar 17 one-to-one, the bottom of counter bore 20 is equipped with the screw hole, screw thread portion is located to the guide bar 17 other end, screw thread portion closes with the screw hole soon, and the second reset spring 19 other end supports closes in the bottom of counter bore 20.

The aperture of one end, close to the top plate 5, of the reset rod hole 8 is larger than that of the other end of the reset rod hole 8, a sliding sleeve 21 is arranged in a large hole of the reset rod hole 8, a notch is formed in one end, close to the top plate 5, of the reset rod hole 8, and a pressing block for limiting the sliding sleeve 21 is arranged at the notch; the diameter of the end, close to the top plate 5, of the ejector rod hole 9 is larger than that of the other end of the ejector rod hole 9, and the length of a large hole of the ejector rod hole 9 is larger than that of a small hole of the ejector rod hole 9.

The position, facing the reset rod hole 8, of the movable die 1 is provided with a blind hole 22, a reset rod wear-resistant block 23 is arranged in the blind hole 22, the diameter of the reset rod wear-resistant block 23 is larger than or equal to that of the reset rod 6, and the end face of the free end of the reset rod 6 abuts against the reset rod wear-resistant block 23.

Example two

The size of one end of the straight top 11 close to the connecting rod 16 is smaller than that of the other end of the straight top 11, the included angle between the side surface of the straight top 11 and the central line is 0.2-2 degrees (1 degree in the embodiment, 0.2 degree, 0.5 degree, 1.5 degree or 2 degrees and the like), and the small hole of the straight top hole 10 is a wedge-shaped hole.

The mold closing state, at the moment, the top plate 5 is attached to the cushion mold 3, the first return spring 15 and the second return spring 19 are both in a compression state, when the mold opening is finished after the injection molding, the movable mold 1 is opened firstly, the relative positions of the top plate 5 and the product and the movable mold 1 are kept unchanged initially under the action of the second return spring 19 and the first return spring 15, and at the moment, the product is separated from the fixed mold 2; the movable die 1 is continuously opened, the limiting rod 14 is limited by the lower part of the step in the step hole 13, and the back-off is just separated from the fixed die 2 completely at the moment; then, as the movable die 1 is continuously opened, the straight top 11 is limited and the relative positions of the top plate 5 and the product and the movable die 1 are still unchanged, the ejector rod 7 still presses the product, and the straight top 11 and the product are forcibly separated by means of elastic deformation of the back-off device in the process until the top plate 5 is attached to the bottom surface of the groove 4 and limited; the ejector rod 7 is separated from the product in the process along with the fact that the movable die 1 is continuously opened outwards to the limiting position; and finally ejecting the product. When the die is closed, the movable die 1 moves towards the fixed die 2, and the reset rod wear-resisting block 23 firstly abuts against the end face of the free end of the reset rod 6; as the movable die 1 continues to move towards the fixed die 2, under the action of the reset rod 6, the top plate 5 is pushed towards the cushion die 3 by the reset rod 6, then the step surface in the first through hole 12 is abutted against the connecting rod 14, and as the top plate 5 is continuously pushed towards the cushion die 3 by the reset rod 6, the straight top 11 also moves towards the cushion die 3; the movable mold 1 continues to move towards the fixed mold 2 until the movable mold abuts against the fixed mold 2, at the moment, the top plate 5 and the straight top 11 return to the mold closing position, and the first return spring 15 and the second return spring 19 are in a compressed state.

The above examples are only preferred embodiments of the present invention, and the present invention is not limited to the above embodiments and other structural changes are allowed, and all changes within the scope of the independent claims of the present invention are included in the protection scope of the present invention.

Claims

1. The utility model provides a direct top of injection mould takes off quadratic term ejection mechanism by force, it includes movable mould (1) and cover half (2), cover half (2) one end is to closing with movable mould (1), all be equipped with the die cavity face on movable mould (1) and cover half (2), die cavity face shape becomes the die cavity when movable mould (1) supports with cover half (2), its characterized in that: the die is characterized in that a cushion die (3) is arranged at the other end of the fixed die (2), a groove (4) is further formed in the other end of the fixed die (2), a top plate (5) is connected in the groove (4) in a sliding mode, at least two reset rods (6) and at least two ejector rods (7) are arranged on the top plate (5), reset rod holes (8) and ejector rod holes (9) which correspond to the reset rods (6) and the ejector rods (7) one to one are formed in the bottom surface of the groove (4), the free end face of each ejector rod (7) is flush with the cavity face of the fixed die (2), the free end face of each reset rod (6) is abutted to the movable die (1), a straight ejector hole (10) is further formed in the middle of the bottom surface of the groove (4), reset rod holes (8) and ejector rod holes (9) are distributed on two sides of the straight ejector hole (10), a straight ejector rod (11) is connected in the straight ejector hole (10) in a sliding mode, a stepped hole (13) is formed in the cushion mold (3), a limiting rod (14) is arranged in the stepped hole (13), one end of the straight top (11) is located in the cavity, the other end of the straight top (11) penetrates through the first through hole (12) to be connected with one end of the limiting rod (14), the other end of the limiting rod (14) is matched with a step in the stepped hole (13) to limit the stroke of the straight top (11), a first reset spring (15) is arranged between the straight top (11) and the cushion mold (3), the first reset spring (15) is sleeved on the limiting rod (14), the straight top (11) is located at the lower limiting position when the first reset spring (15) is in an unstressed state, a reset mechanism is arranged between the top plate (5) and the cushion mold (3), and the initial position of the top plate (5) is located on the bottom surface of the groove (4); the novel anti-abrasion device is characterized in that a blind hole (22) is formed in the position, opposite to the reset rod hole (8), of the movable die (1), a reset rod abrasion-resistant block (23) is arranged in the blind hole (22), the diameter of the reset rod abrasion-resistant block (23) is larger than or equal to that of the reset rod (6), and the end face of the free end of the reset rod (6) is abutted to the reset rod abrasion-resistant block (23).

2. The direct ejection forced ejection double ejection mechanism of the injection mold according to claim 1, characterized in that: the other end of the straight top (11) is connected with one end of a limiting rod (14) through a connecting rod (16), the connecting rod (16) is of a T-shaped structure, a first through hole (12) is of a T-shaped structure matched with the connecting rod (16), the aperture of one end, close to the cushion mold (3), of the first through hole (12) is larger than that of the other end of the first through hole (12), the axis of the first through hole (12) and the axis of the straight top hole (10) are on the same vertical line, one end of a first reset spring (15) is abutted to one end of the connecting rod (16), and the other end of the first reset spring (15) is abutted to one end of the cushion mold (3).

3. The direct ejection forced ejection double ejection mechanism of the injection mold according to claim 2, characterized in that: one end of the straight top hole (10) close to the connecting rod (16) is provided with a reaming hole, the reaming hole is a round hole, and the diameter of the reaming hole is larger than the diameter of one end of the connecting rod (16) connected with the straight top (11).

4. The direct ejection forced ejection double ejection mechanism of the injection mold according to claim 3, wherein: the size of the near connecting rod (16) one end of the straight top (11) is smaller than that of the other end of the straight top (11), an included angle between the side face of the straight top (11) and the central line is 0.2-2 degrees, and a small hole of the straight top hole (10) is a wedge hole.

5. The direct ejection forced ejection double ejection mechanism of the injection mold according to claim 1, characterized in that: reset mechanism includes two piece at least guide bar (17), the axis of guide bar (17) is parallel with the axis of gag lever post (14), be equipped with on roof (5) with second through-hole (18) of guide bar (17) one-to-one, guide bar (17) one end and second through-hole (18) sliding connection, the guide bar (17) other end and pad mould (3) fixed connection, all cup jointed second reset spring (19) on guide bar (17), second reset spring (19) one end and roof (5) are to closing, and second reset spring (19) other end and pad mould (3) are to closing.

6. The direct ejection forced ejection double ejection mechanism of the injection mold according to claim 5, wherein: guide bar (17) equipartition is in gag lever post (14) both sides, be equipped with on pad mould (3) counter bore (20) with guide bar (17) one-to-one, the bottom of counter bore (20) is equipped with the screw hole, and screw thread portion is located to the guide bar (17) other end, screw thread portion closes with the screw hole soon, and second reset spring (19) other end supports closes in the bottom of counter bore (20).

7. The direct ejection forced ejection double ejection mechanism of the injection mold according to claim 1, characterized in that: the aperture of one end of the reset rod hole (8) close to the top plate (5) is larger than that of the other end of the reset rod hole (8), and a sliding sleeve (21) is arranged in a large hole of the reset rod hole (8); the diameter of the end, close to the top plate (5), of the ejector rod hole (9) is larger than that of the other end of the ejector rod hole (9), and the length of a large hole of the ejector rod hole (9) is larger than that of a small hole of the ejector rod hole (9).