A mechanism for ejecting a molded article from a mold

Abstract

The present application provides a kind of inclined ejection mechanism of mould, belongs to injection mould technical field.It solves the problem of existing mould inclined ejection rod's telescopic movement exists jam and noise.This mould inclined ejection mechanism, mould includes movable die and the top plate capable of moving relative to movable die, inclined ejection mechanism includes sliding and being arranged on movable die inclined ejection rod, and the sliding block is hinged on the outer end of inclined ejection rod by pin shaft, and the guide shaft is fixed on the top plate, and the inner end of inclined ejection rod is inclined to the outer end along the axial direction of guide shaft, and the guide hole is opened in sliding block, and sliding block is slidably sleeved on guide shaft by guide hole, and pin shaft is perpendicular to inclined ejection rod and guide shaft respectively, and the cross section of guide shaft and guide hole is circular, and guide sleeve is further arranged between the outer peripheral wall of guide shaft and the hole wall of guide hole.The telescopic movement of inclined ejection rod of this mould inclined ejection mechanism can be more smooth, and jam and noise are reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of injection mold and relates to a slanted ejection mechanism of a mold. BACKGROUND

[0002] Injection molding, also known as injection molding, is a molding method of injection and molding. It has high production speed and efficiency, and the operation can be automated. It is suitable for mass production and complex product molding processing fields. At a certain temperature, the completely melted plastic material is injected into the cavity by the screw, and the molded product is obtained after cooling and solidification. After the product is molded, demolding is required, so the structure of pushing, core pulling, etc. is involved. The top rod pushes the top block, and the top block moves to achieve the action of ejection, core pulling, etc. The top rod is pushed by the driving force of the injection molding machine, that is, the injection molding machine can push the top plate to move the top rod. The moving direction is the same as the opening direction of the movable mold. However, for complex products, it may involve horizontal or inclined ejection, core pulling, etc. Therefore, the top rod needs to drive the top block to move obliquely, that is, the vertical movement of the top plate needs to be converted into the inclined movement of the top block. Therefore, the top rod is usually inclined to move the top block obliquely by axial movement. However, the top rod will horizontally translate while moving axially, so the top rod and the top plate are slidingly connected. An inclined sliding hole is usually provided on the movable mold, the top rod is connected to the sliding block, and the sliding block is slidingly connected in the sliding groove of the top plate. If the inclination angle of the sliding hole deviates from the inclination angle of the top rod, the top rod and the hole wall will be stuck.

[0003] In view of the problem that the inclination angle of the top rod deviates to cause sticking, the patent document (application number: 201620524007.8) discloses a simple inclined ejection sliding foot device of an injection mold, which comprises a smooth block and a rotating block. The smooth block is provided with a shaft hole, and the rotating block is provided with a rotating shaft, a top rod groove and a countersunk hole. Two smooth blocks are respectively slidingly clamped on the left and right sides of the rotating block and are connected through the rotating shaft and the shaft hole. In application, the smooth block is slidingly arranged in the installation groove provided on the pressing plate of the mold, and the lower surface of the smooth block is in sliding contact with the top plate of the mold. The lower end of the inclined top rod is embedded in the top rod groove, and the inclined top rod is fixedly connected with the rotating block through a hexagonal socket cap screw passing through the countersunk hole. That is, the inclined top rod can be adjusted in the inclined direction through the hinged connection of the rotating shaft and the shaft hole, so as to adapt to the inclination angle of the sliding hole. However, in the actual application process, the above-mentioned hinged structure can only adjust the inclination angle of the inclined top rod, but the smooth block is slidingly connected in the installation groove, and the axial direction of the rotating shaft needs to be absolutely horizontal. If the position accuracy of the two smooth blocks causes the axial direction of the rotating shaft to deviate from the horizontal direction, the inclined top rod and the hole wall of the sliding hole will also be stuck to produce noise, and the movement of the inclined top rod will not be smooth enough. SUMMARY

[0004] The present application aims at the above-mentioned problems existing in the prior art, and provides a mold inclined ejection mechanism.

[0005] The present application can be achieved by the following technical scheme: a mold inclined ejection mechanism, the mold comprising a movable mold and a top plate capable of moving relative to the movable mold, the inclined ejection mechanism comprising an inclined ejection rod slidingly arranged on the movable mold, and a sliding block hinged to the outer end of the inclined ejection rod by a pin shaft, characterized in that a guide shaft is fixed on the top plate, the inner end of the inclined ejection rod is arranged obliquely along the axial direction of the guide shaft relative to the outer end, a guide hole is formed in the sliding block, and the sliding block is slidingly sleeved on the guide shaft through the guide hole, the pin shaft is perpendicular to the inclined ejection rod and the guide shaft, respectively, the cross sections of the guide shaft and the guide hole are circular, and a guide sleeve is further arranged between the outer circumferential wall of the guide shaft and the hole wall of the guide hole.

[0006] The movable mold has a cavity surface, an embedding groove for accommodating the top block is formed on the cavity surface, a long and obliquely arranged sliding hole is further formed on the movable mold, the inner end of the sliding hole penetrates into the embedding groove, the inclined ejection rod is slidingly arranged in the sliding hole, the top block is fixed on the inner end of the inclined guide rod, the top plate is located at a position away from the movable mold in the mold closing state, and the top block is embedded in the embedding groove; when the mold is opened and the product needs to be ejected by the top block, the top plate moves towards the movable mold, the guide shaft on the top plate can push the inclined guide rod to move axially through the sliding block, since the inclined guide rod is in an inclined state, i.e., there is an included angle between the axial movement of the inclined ejection rod and the movement direction of the top plate, the axial movement of the inclined ejection rod will drive the sliding block to move axially along the guide shaft, thereby achieving the ejection of the product. Taking the left-right inclination of the inclined guide rod as an example, when there is an error between the inclination angle of the inclined guide rod and the inclination angle of the sliding block, since the inclined guide rod is hinged to the sliding block through the pin shaft, the inclined guide rod can be swung around the pin shaft to adapt to the adjustment, thereby avoiding the jamming of the inclined guide rod and the hole wall of the sliding hole in the left-right direction. In particular, the guide shaft and the guide hole are circular in cross section, so that the sliding block can rotate on the guide shaft; when there is an angle deviation between the inclined guide rod and the sliding hole in the front-rear direction, the inclined guide rod can drive the sliding block to rotate around the guide shaft to adapt to the adjustment, thereby avoiding the jamming of the inclined guide rod and the hole wall of the sliding hole in the front-rear direction. Therefore, the axial extension and retraction of the inclined guide rod are more smooth through the left-right swinging design of the inclined guide rod around the pin shaft and the front-rear swinging design of the inclined guide rod around the guide shaft, thereby avoiding the jamming and noise.

[0007] In the above-mentioned mold inclined ejection mechanism, a plurality of through holes penetrating in the radial direction are formed in the guide sleeve, and a lubricating sheet made of graphite material is embedded in the through holes. The lubricating sheet is made of graphite material, which can play a lubricating role and make the movement of the sliding block relative to the guide shaft more smooth.

[0008] In the inclined ejector mechanism of the mold, the guide sleeve is fixed on the guide shaft in the axial direction, the sliding block is sleeved on the guide sleeve, the guide hole wall is in sliding fit with the outer wall of the guide sleeve, and the outer side surface of the lubricating sheet is attached to the guide hole wall.

[0009] In the inclined ejector mechanism of the mold, the guide hole wall is in sliding fit with the outer wall of the guide sleeve, and the outer side surface of the lubricating sheet is attached to the guide hole wall.

[0010] In the inclined ejector mechanism of the mold, the guide hole wall is in sliding fit with the outer wall of the guide sleeve, and the outer side surface of the lubricating sheet is attached to the guide hole wall.

[0011] In the inclined ejector mechanism of the mold, the guide hole wall is in sliding fit with the outer wall of the guide sleeve, and the outer side surface of the lubricating sheet is attached to the guide hole wall.

[0012] In the inclined ejection mechanism of the mold, the thickness of the lubricating sheet is smaller than the depth of the through hole, the lubricating sheet has a columnar limiting part on the side facing the guide shaft, the limiting part abuts against the outer peripheral wall of the guide shaft, a pressure cavity is formed between the side of the lubricating sheet and the outer peripheral wall of the guide shaft and surrounds the limiting part, and the lubricating groove is in communication with the pressure cavity. The outer side of the lubricating sheet is pressed against the hole wall of the guide hole under the support of the limiting part, and during long-term use, as the lubricating sheet is worn, the pressing force between the lubricating sheet and the hole wall of the guide hole becomes smaller, affecting the lubricating effect. Therefore, the application sets the pressure cavity in communication with the lubricating groove, and when the sliding block moves, the lubricating grease in one end of the oil storage cavity is extruded, the lubricating grease needs to pass through the pressure cavity and then enters the other oil storage cavity, and under the extrusion of the sliding block, the lubricating grease has a large pressure, and the pressure also acts on the inner side of the lubricating sheet, so that the lubricating sheet is pressed against the hole wall of the guide hole, that is, the pressure of the lubricating grease is used to increase the pressing force between the lubricating sheet and the hole wall of the guide hole, and the lubricating effect is improved.

[0013] In the inclined ejection mechanism of the mold, the through hole has a plurality of rows, and the through holes in each row are in communication through a lubricating groove, the lubricating groove penetrates the hole wall of the through hole, and the groove depth of the lubricating groove is greater than the thickness of the lubricating sheet. The flow of the lubricating grease is more regular and smooth.

[0014] In the inclined ejection mechanism of the mold, the lower side of the top plate is fixed with a block-shaped fixed seat, the upper side of the fixed seat is provided with a mounting groove, the guide shaft is fixedly arranged in the mounting groove, the top plate is provided with a gap notch opposite to the mounting groove, and the inclined ejection rod passes through the gap notch. The setting of the fixed seat makes the assembly more convenient, and the slot of the mounting groove is covered by the top plate, only leaving the gap notch for the inclined ejection rod to pass through, so as to avoid foreign matters from entering the mounting groove and affecting the sliding.

[0015] In the inclined ejection mechanism of the mold, the gap notch is in a strip shape and is arranged along the axial direction of the guide shaft, and the length of the gap notch is smaller than the length of the sliding block in the axial direction of the guide shaft, the upper side of the sliding block is provided with a connecting groove, and the pin shaft is connected in the connecting groove. The sliding block can also block part of the gap notch, so as to avoid foreign matters from entering the mounting groove and affecting the sliding of the sliding block.

[0016] Compared with the prior art, the inclined ejection mechanism of the mold has the following advantages:

[0017] 1. The guide shaft and the guide hole are matched in the application, the cross section of the guide shaft is circular, the slider can rotate on the guide shaft, when the angle deviation exists between the inclined guide rod and the sliding hole in the front and back direction, the inclined guide rod can drive the slider to rotate around the guide shaft to adjust, so as to avoid the inclined guide rod and the sliding hole wall in the front and back direction, that is, the inclined rod swings left and right around the pin shaft and the inclined rod swings forward and backward around the guide shaft, so that the inclined rod axial extension and retraction are more smooth, and the jamming and noise are avoided.

[0018] 2. The guide sleeve is located between the two sealing convex edges, in the sealed state, which can avoid the entry of external dust, debris and other things, can reduce the wear of the guide sleeve, and can improve the lubrication effect, so that the movement is more smooth.

[0019] 3. The application is provided with a pressure chamber communicated with the lubricating groove, when the slider moves, the lubricating grease in one end of the oil storage cavity is extruded, the lubricating grease needs to enter the other oil storage cavity after passing through the pressure chamber, under the extrusion of the slider, the lubricating grease has a large pressure, the pressure also acts on the inner side of the lubricating sheet, so as to press the lubricating sheet on the guide hole wall, that is, the pressure of the lubricating grease is used to increase the pressing force between the lubricating sheet and the guide hole wall, and the lubrication effect is improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a partial structure sectional view of the inclined top mechanism of the mold.

[0021] Figure 2 is a partial structure sectional view of the inclined top mechanism of the mold at the slider.

[0022] Figure 3 is Figure 2 a partial structure sectional view of A-A in

[0023] Figure 4 is Figure 2 a structure enlarged view of B in

[0024] Figure 5 is Figure 3 a structure enlarged view of C in

[0025] Figure 6 is a three-dimensional structure schematic view of the guide sleeve.

[0026] In the figure, 1, movable die; 11, cavity surface; 12, embedding groove; 13, sliding hole; 2, top plate; 21, let go of the gap; 3, inclined ejector rod; 31, ejector block; 4, sliding block; 41, guide hole; 42, sealing convex edge; 43, oil storage cavity; 44, connecting groove; 45, pin shaft; 5, fixed seat; 51, mounting groove; 52, guide shaft; 6, guide sleeve; 61, through hole; 62, lubrication channel; 621, lubrication groove; 63, flow guide surface; 64, pressure cavity; 7, lubrication sheet; 71, limiting part; 8, clamp spring; 9, sealing ring. DETAILED DESCRIPTION

[0027] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0028] As shown in Figure 1 , an inclined ejector mechanism of a mold, the mold comprising a movable die 1 and a top plate 2, the movable die 1 having a cavity surface 11, an embedding groove 12 being formed on the cavity surface 11, the top plate 2 being capable of moving close to or away from the movable die 1 under the drive of an injection molding machine, a long and inclined sliding hole 13 being formed on the movable die 1, the inclined ejector mechanism comprising an inclined ejector rod 3 slidingly arranged in the sliding hole 13, an ejector block 31 being fixed to the inner end of the inclined ejector rod 3, and the ejector block 31 being embedded in the embedding groove 12 when the top plate 2 is at a position away from the movable die 1. In combination with Figure 2 , Figure 3 , a sliding block 4 is hinged to the outer end of the inclined ejector rod 3 through a pin shaft 45, a fixed seat 5 is fixed on the top plate 2, a guide shaft 52 is fixed on the fixed seat 5, the inner end of the inclined ejector rod 3 is inclinedly arranged along the axial direction of the guide shaft 52, a guide hole 41 is formed on the sliding block 4, the sliding block 4 is slidingly sleeved on the guide shaft 52 through the guide hole 41, the pin shaft 45 is perpendicular to the inclined ejector rod 3 and the guide shaft 52 respectively, the cross sections of the guide shaft 52 and the guide hole 41 are circular, a guide sleeve 6 is further arranged between the outer peripheral wall of the guide shaft 52 and the hole wall of the guide hole 41, the guide sleeve 6 is sleeved on the guide shaft 52 and is axially fixed to the guide shaft 52 through a clamp spring 8, and can rotate in the circumferential direction, the sliding block 4 is slidingly sleeved on the guide sleeve 6, and the hole wall of the guide hole 41 and the outer peripheral wall of the guide sleeve 6 are in sliding fit, when the mold is opened and the ejector block 31 needs to eject the product, the top plate 2 moves close to the movable die 1, the guide shaft 52 on the top plate 2 can push the inclined ejector rod to move axially through the sliding block 4, and at the same time, the sliding block 4 can move axially along the guide shaft 52.

[0029] Specifically, the fixed seat 5 is in block shape, and a mounting groove 51 is formed on the upper side of the fixed seat 5, a guide shaft 52 is fixedly arranged in the mounting groove 51, a notch 21 is formed on the top plate 2 and is opposite to the mounting groove 51, the notch 21 is in strip shape and is arranged along the axial direction of the guide shaft 52, and the length of the notch 21 is less than the length of the sliding block 4 along the axial direction of the guide shaft 52, a connecting groove 44 is formed on the upper side of the sliding block 4, a pin shaft 45 is connected in the connecting groove 44, the inclined lifting rod 3 passes through the notch 21 and extends into the connecting groove 44 and is hinged with the pin shaft 45. Figure 4 、 Figure 5 、 Figure 6 As shown in Figs. 7, 8 and 9, a plurality of rows of through holes 61 are formed on the guide sleeve 6, the through holes 61 are uniformly distributed along the circumferential direction of the guide sleeve 6, each row of the through holes 61 is two and is arranged along the axial direction, each through hole 61 is arranged along the radial direction of the guide sleeve 6, a lubricating sheet 7 made of graphite material is embedded in each through hole 61, the thickness of the lubricating sheet 7 is less than the depth of the through hole 61, a cylindrical limiting portion 71 is formed on the side of the lubricating sheet 7 facing the guide shaft 52, the limiting portion 71 abuts against the outer circumferential wall of the guide shaft 52, and the outer side of the lubricating sheet 7 is tightly pressed against the hole wall of the guide hole 41 under the support of the limiting portion 71. The two end opening edges of the guide hole 41 are both circumferentially provided with a sealing protrusion 42, a sealing ring 9 is arranged between the sealing protrusion 42 and the guide shaft 52, so that the inner circumferential wall of the sealing protrusion 42 and the outer circumferential wall of the guide shaft 52 are sealed, the guide sleeve 6 is located between the two sealing protrusions 42, and the spacing between the inner end faces of the two sealing protrusions 42 is greater than the length of the guide sleeve 6, so that the two end faces of the guide sleeve 6 and the inner end faces of the two sealing protrusions 42 form oil storage cavities 43 respectively, the oil storage cavities 43 are filled with lubricating grease, and the guide sleeve 6 is provided with a lubricating channel 62 which communicates the two end oil storage cavities 43. The lubricating channel 62 includes a plurality of strip-shaped lubricating grooves 621 formed on the outer circumferential wall of the guide sleeve 6, the groove opening of the lubricating groove 621 is opposite to the hole wall of the guide hole 41, the lubricating grooves 621 are distributed along the circumferential direction of the guide sleeve 6, the two ends of the lubricating groove 621 respectively penetrate the two end faces of the guide sleeve 6, and the two end openings of the lubricating groove 621 are in flared shape. The inner side of the lubricating sheet 7 and the outer circumferential wall of the guide shaft 52 form a pressure cavity 64 which is arranged around the limiting portion 71, each row of the through holes 61 is communicated through a lubricating groove 621, the lubricating groove 621 penetrates the hole wall of the through hole 61, the depth of the lubricating groove 621 is greater than the thickness of the lubricating sheet 7, and a flow face 63 is further formed on the bottom face of the communication part of the lubricating groove 621 and the through hole 61, so as to facilitate the lubricating grease in the lubricating groove 621 to enter the pressure cavity 64.

[0030] The specific embodiments described herein merely exemplify the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways to replace, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

[0031] Although the terms die 1, cavity surface 11, and recess 12 are used herein more frequently, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the nature of the present application; any interpretation that these terms are intended as any kind of additional limitation is contrary to the spirit of the present application.

Claims

1. A slanted ejector mechanism for a mold, the mold comprising a movable mold (1) and a top plate (2) movable relative to the movable mold (1), the slanted ejector mechanism comprising a slanted ejector rod (3) slidably passing through the movable mold (1), and a slider (4) hinged at the outer end of the slanted ejector rod (3) via a pin (45), characterized in that, The top plate (2) is fixed with a guide shaft (52), the inner end of the inclined top rod (3) is arranged obliquely along the axial direction of the guide shaft (52) relative to the outer end, the sliding block (4) is provided with a guide hole (41), and the sliding block (4) is slidably sleeved on the guide shaft (52) through the guide hole (41), the pin shaft (45) is perpendicular to the inclined top rod (3) and the guide shaft (52) respectively, the guide shaft (52) and the guide hole (41) are both circular in cross section, and a guide sleeve (6) is further arranged between the outer peripheral wall of the guide shaft (52) and the hole wall of the guide hole (41); the two end opening edges of the guide hole (41) are both circumferentially provided with a sealing protruding edge (42), the two end faces of the guide sleeve (6) and the inner end faces of the two sealing protruding edges (42) form oil storage cavities (43) respectively, the oil storage cavities (43) are filled with lubricating grease, the guide sleeve (6) is provided with a lubricating channel (62) that communicates the two end oil storage cavities (43), and the lubricating channel (62) comprises a plurality of long strip-shaped lubricating grooves (621) formed on the outer peripheral wall of the guide sleeve (6); the plurality of lubricating grooves (621) are circumferentially distributed on the guide sleeve (6), and the two ends of the lubricating groove (621) respectively penetrate the two end faces of the guide sleeve (6).

2. The ejection mechanism of a mold according to claim 1, wherein The guide sleeve (6) is provided with a plurality of through holes (61) that penetrate in the radial direction, and the through holes (61) are embedded with lubricating sheets (7) made of graphite material.

3. The ejection mechanism of a mold according to claim 2, wherein The guide sleeve (6) is fixed on the guide shaft (52) in the axial direction, the sliding block (4) is slidably sleeved on the guide sleeve (6), and the hole wall of the guide hole (41) and the outer peripheral wall of the guide sleeve (6) are in sliding fit, and the outer side surface of the lubricating sheet (7) abuts against the hole wall of the guide hole (41).

4. An ejection mechanism for a mould as claimed in claim 2 or 3, characterised in that, The inner peripheral wall of the sealing protruding edge (42) and the outer peripheral wall of the guide shaft (52) form a seal, the guide sleeve (6) is located between the two sealing protruding edges (42), and the distance between the inner end faces of the two sealing protruding edges (42) is greater than the length of the guide sleeve (6).

5. The ejection mechanism of a mold according to claim 4, wherein The thickness of the lubricating sheet (7) is less than the depth of the through hole (61), and the side surface of the lubricating sheet (7) towards the guide shaft (52) is provided with a columnar limiting portion (71) that abuts against the outer peripheral wall of the guide shaft (52), a pressure cavity (64) that surrounds the limiting portion (71) is formed between the side surface of the lubricating sheet (7) and the outer peripheral wall of the guide shaft (52), and the lubricating groove (621) is in communication with the pressure cavity (64).

6. The ejection mechanism of a mold according to claim 5, wherein The through holes (61) are arranged in a plurality of rows, the through holes (61) in each row are communicated through a lubricating groove (621), the lubricating groove (621) penetrates the hole wall of the through hole (61), and the groove depth of the lubricating groove (621) is greater than the thickness of the lubricating sheet (7).

7. The ejection mechanism of a mold according to claim 1 or 2 or 3, characterized in that, The bottom surface of the top plate (2) is fixed with a block-shaped fixing seat (5), the upper surface of the fixing seat (5) is provided with a mounting groove (51), the guide shaft (52) is fixedly arranged in the mounting groove (51), the top plate (2) is provided with a gap notch (21) opposite to the mounting groove (51), and the inclined top rod (3) penetrates through the gap notch (21).

8. The ejection mechanism of a mold according to claim 7, wherein The yielding gap (21) is in the shape of a long strip and is arranged along the axial direction of the guide shaft (52), and the length of the yielding gap (21) is less than the length of the slider (4) along the axial direction of the guide shaft (52), and a connecting groove (44) is formed on the upper side of the slider (4), and the pin shaft (45) is connected in the connecting groove (44).

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