Secondary ejection demolding mechanism

Abstract

The utility model relates to the technical field of molds, and discloses a secondary ejection demolding mechanism which comprises a bottom plate, two square irons, a first ejection plate, a second ejection plate, a third ejection plate, a supporting plate, a core column, a silica gel core petal and a movable mold plate, the square irons are fixed on the bottom plate, an ejector pin is arranged on the first ejection plate, a T-shaped limiting block is further fixed on the side face of the first ejection plate, and the second ejection plate is fixed on the movable mold plate. The first ejector plate, the second ejector plate and the third ejector plate are stacked and arranged between the square iron, the clamping block is arranged on the supporting plate and fixed to the square iron, the core column is connected with the clamping block in a clamped mode, the silica gel core petal is connected with the core column in a sliding mode, and the movable mold plate is pressed on the supporting plate in a covering mode. An external hydraulic system drives the ejection plate to move, the core column is separated from a product through first ejection, the product is separated from the movable mold plate through second ejection, the demolding mechanism enables the product with an inverted buckle to be conveniently ejected out, and the undesirable phenomena of ejection deviation, ejection penetration, ejection damage and the like are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, in particular to a secondary ejection demoulding mechanism. Background Art

[0002] Molds are various molds and tools used in industrial production to obtain the desired products by injection molding, blow molding, extrusion, die casting or forging, smelting, stamping and other methods; they are widely used in blanking, die forging, cold heading, extrusion, powder metallurgy pressing, pressure casting, and compression or injection molding of engineering plastics, rubber, ceramics and other products. The mold has a specific contour or inner cavity shape. The use of a contour shape with a cutting edge can make the blank separate according to the contour shape, and the use of an inner cavity shape can make the blank obtain a corresponding three-dimensional shape.

[0003] The main function of the mold ejection system is to push the push plate, push rod, push tube and other components on the mold through a series of mechanical or hydraulic devices after the mold is opened, so as to separate the molded plastic parts from the mold core. When ejecting a product with an undercut inside, it is difficult to eject the product if only one ejection is used and the ejection is done by using the push plate around the parting surface. Undesirable phenomena such as ejection deviation, ejection penetration and ejection damage often occur. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a secondary ejection mechanism for a mold, which solves the problems that products with undercuts inside are difficult to eject once, and often have ejection deviation, ejection penetration and ejection damage.

[0005] The technical problem to be solved by the utility model is achieved by adopting the following technical solutions:

[0006] A secondary ejection demoulding mechanism, comprising:

[0007] The bottom plate has symmetrically distributed mounting holes on its end surface, and symmetrically disposed removable first limiting blocks on two side surfaces perpendicular to the end surface;

[0008] Square irons, two in number, detachably fixed to the end surface of the bottom plate;

[0009] A first ejector plate is arranged between two square irons with a gap, an ejector pin is arranged on the end surface of the first ejector plate close to the bottom plate, and T-shaped limit blocks are symmetrically fixed on both side surfaces of the ejector plate, and the side surfaces are parallel to the plane on which the limit blocks are arranged on the bottom plate;

[0010] A second ejector plate is disposed between the two square irons with a gap therebetween, and the second ejector plate is detachably fixed to the end surface of the first ejector plate close to the bottom plate;

[0011] A support plate is detachably fixed on the end face of the square iron away from the bottom plate, a U-shaped block is detachably provided on the end face of the support plate away from the square iron, and a limiting column is detachably provided on the end face of the support plate close to the square iron, and a through hole for passing the ejector pin is also provided on the support plate;

[0012] The core column is composed of a column and a retaining sleeve in the shape of a regular prism. An annular groove is provided on the column to be clamped with a U-shaped clamping block on the support plate. A through hole for passing the ejector pin is also provided on the bottom surface of the column. Inclined sliding grooves are distributed at intervals on the outer side of the retaining sleeve in the circumferential direction. A boss for forming the inner cavity of the product is provided on the end surface away from the column. The upper half of the product is a circular boss with an open notch, and the lower half is a round cover with an inner ring buckle. An integral cylindrical protrusion is provided at the center of the round cover. The product is integrally injection molded by the upper and lower parts;

[0013] The silicone core petal has an end shape that matches the cavity shape of the round cover on the lower half of the product, and its number matches the number of slide grooves on the retaining sleeve. The side is provided with a protrusion that matches the shape of the slide groove of the retaining sleeve. The silicone core petal is circumferentially embedded in the slide groove of the retaining sleeve;

[0014] The movable template has a mold core on its end face away from the support plate, on which is a cavity for forming the lower half of the product. A flange is detachably fixed to the end face of the mold core close to the support plate. The flange is concentric with the core column body. The movable template is pressed onto the end face of the support plate away from the bottom plate.

[0015] Due to the adoption of the above technical solution, when the external hydraulic system drives the ejector plate to move, the first ejection action causes the core column to be separated from the product, and the second ejection action causes the product to be separated from the movable template, thereby facilitating the ejection of products with undercuts and avoiding undesirable phenomena such as ejection deviation, ejection penetration and ejection damage.

[0016] Furthermore, the secondary ejection demolding mechanism also includes: a third ejector plate, which is arranged between the two square irons with a gap, the end face of the third ejector plate abuts against the end face of the second ejector plate, an open T-shaped cavity groove is arranged on the end face of the third ejector plate, and the end face is parallel to the mounting surface of the first limit block, a second limit block is arranged at the lower part of the T-shaped cavity groove, and a pressure block is arranged at the upper part, and the pressure block is detachably fixed to the third ejector plate.

[0017] Due to the adoption of the above technical solution, the two demoulding processes of the secondary ejection demoulding mechanism can be distinguished.

[0018] Furthermore, an open notch is provided on the end surface of the first limiting block away from the bottom plate, and an open through groove is provided on the side surface perpendicular to the end surface, and the through groove is in the shape of a right-angled trapezoid.

[0019] Due to the adoption of the above technical solution, during the rising process of the ejector plate, the trapezoidal inclined surface of the through groove is squeezed by the second limiting block to limit the movement of the third ejector plate.

[0020] Furthermore, the number of ejectors is three and they are distributed in a circle around the core column, penetrating the first ejector plate and the core column. One end of the ejector is fixed to the first ejector plate, and the other end is in contact with the product.

[0021] Due to the adoption of the above technical solution, the product is evenly stressed during demoulding, making ejection easier.

[0022] Furthermore, the T-shaped limit block is provided with an undercut near the rear of the bottom plate, which is inserted into the open slot of the first limit block, and the undercut abuts against the second limit block.

[0023] Due to the adoption of the above technical solution, when the first ejector plate moves, it will drive the third ejector plate to move together.

[0024] Furthermore, the second limit block is a right prism with a right-angled trapezoidal bottom surface, a blind hole is provided on the surface away from the T-shaped limit block and a gap is provided with the T-shaped cavity groove of the third ejection plate, a spring is provided in the blind hole, one end of the spring abuts against the second limit block, and the other end abuts against the third ejection plate.

[0025] Due to the adoption of the above technical solution, during the rising process of the ejector plate, the second limit block can automatically reset after being squeezed and contracted.

[0026] Furthermore, the first ejection plate and the second ejection plate are provided with through holes larger than the diameter of the limiting pillars, and the through holes of the two plates are congruent.

[0027] Due to the adoption of the above technical solution, during the rising process of the ejector plate, the third ejector plate stops rising due to the action of the limiting pillars while the first ejector plate and the second ejector plate continue to rise, so that the two ejection processes can be distinguished.

[0028] The beneficial effects of the utility model are as follows: a secondary ejection demoulding mechanism is provided, wherein an external hydraulic device drives an ejection plate to rise, and during the first ejection process, an ejector pin arranged on the first ejection plate ejects the movable template, and the core column does not move due to the clamping of the U-shaped clamping block, so that the core column is ejected from the product cavity; during the second ejection process, the first ejection plate, the second ejection plate, and the third ejection plate rise synchronously until the inclined surface of the through groove on the first limit block squeezes the second limit block, the second limit block contracts, the T-shaped limit block is inverted and separated from the second limit block, the first ejection plate and the second ejection plate continue to rise, the end face of the third ejection plate abuts against the end face of the limit column and stops moving, the product is ejected from the mold core of the movable template, and the demoulding action is completed. The demoulding mechanism makes it easy to eject products with inverted buckles, and avoids undesirable phenomena such as ejection deviation, ejection penetration, and ejection damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure of the secondary ejection demoulding mechanism;

[0030] Figure 2 It is a schematic diagram of the secondary ejection process of the secondary ejection demoulding mechanism;

[0031] Figure 3 is a cross-sectional schematic diagram of the primary ejection state of the secondary ejection demoulding mechanism;

[0032] Figure 4 It is a schematic diagram of the core column of the secondary ejection demoulding mechanism;

[0033] Figure 5 It is a schematic diagram of the core petal of the secondary ejection demoulding mechanism;

[0034] Figure 6 It is a structural schematic diagram of the lifting plate limit block of the secondary ejection demoulding mechanism.

[0035] In the figure: 1, bottom plate; 2, square iron; 3, first ejector plate; 4, second ejector plate; 5, third ejector plate; 6, support plate; 7, core column; 8, silicone core petal; 9, movable template; 11, first limit block; 31, ejector pin; 32, T-type limit block; 51, second limit block; 52, pressure block; 61, U-type clamping block; 62, limit column; 71, column; 72, retaining sleeve; 91, mold core; 92, flange. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.

[0037] like Figure 1 As shown, a secondary ejection demoulding mechanism comprises:

[0038] Bottom plate 1, square iron 2, first ejector plate 3, second ejector plate 4, third ejector plate 5, support plate 6, core column 7, silicone core petal 8, moving template 9.

[0039] The end surface of the bottom plate 1 is provided with symmetrically distributed mounting holes, and two side surfaces perpendicular to the end surface are symmetrically provided with detachable first limiting blocks 11 .

[0040] Square irons 2, two in number, detachably fixed to the end surface of the bottom plate 1;

[0041] The first ejector plate 3 is disposed between the two square irons 2 with a gap therebetween. An ejector pin 31 is disposed on the end surface of the first ejector plate 3 close to the bottom plate 1 .

[0042] Preferably, the number of ejector pins 31 is three and they are distributed in a circle around the column 71 of the core column 7, penetrating the first ejector plate 3 and the core column 7. The ejector pin 31 is stepped, and the step transition section is chamfered. The end of the ejector pin 31 with a larger diameter is fixed on the first ejector plate 3, and the other end abuts against the product.

[0043] T-shaped limit blocks 32 are symmetrically fixed on both side surfaces of the first ejection plate 3 , and the side surfaces are parallel to the plane on which the limit blocks are arranged on the bottom plate 1 .

[0044] A second ejector plate 4 is disposed between the two square irons 2 with a gap therebetween, and the second ejector plate 4 is detachably fixed to the end surface of the first ejector plate 3 close to the bottom plate 1;

[0045] The third ejector plate 5 is arranged between the two square irons 2 with a gap, the end surface of the third ejector plate 5 is in contact with the end surface of the second ejector plate 4, an open T-shaped cavity groove is arranged on the end surface of the third ejector plate 5, and the end surface is parallel to the mounting surface of the first limit block 11, a second limit block 51 is arranged at the lower part of the T-shaped cavity groove, and a pressing block 52 is arranged at the upper part, and the pressing block 52 is detachably fixed on the third ejector plate 5;

[0046] like Figure 6 As shown, preferably, an open notch is provided on the end face of the first limit block 11 away from the bottom plate 1, and an open through groove is provided on the side perpendicular to the end face, and the through groove is in the shape of a right-angled trapezoid. The T-shaped limit block 32 is provided with an undercut near the tail of the bottom plate 1, and the T-shaped limit block is inserted into the open notch of the first limit block 11, and its undercut abuts against the second limit block 51. The second limit block 51 is a straight prism with a right-angled trapezoidal bottom face, and a blind hole is provided on the face away from the T-shaped limit block 32 and a gap is provided with the T-shaped cavity groove of the third ejection plate 5, and a spring is provided in the blind hole, one end of the spring abuts against the second limit block 51, and the other end abuts against the third ejection plate 5.

[0047] Preferably, the first ejection plate 3 and the second ejection plate 4 are provided with four through holes which are larger than the diameter of the limiting pillars 62 , and the through holes of the two plates are congruent.

[0048] The support plate 6 is detachably fixed on the end face of the square iron 2 away from the bottom plate 1. The end face of the support plate 6 away from the square iron 2 is detachably provided with a U-shaped block 61. The end face of the support plate 6 close to the square iron 2 is detachably provided with a limiting column 62, which is also provided with a through hole for passing the ejector pin 31.

[0049] like Figure 4As shown, the core column 7 is composed of a column 71 and a right prism-shaped retaining sleeve 72. The column 71 is provided with an annular groove, which is clamped with the U-shaped clamping block 61 on the support plate 6. The bottom surface of the column 71 is also provided with a through hole for passing the ejector pin 31. The outer side of the retaining sleeve 72 is provided with inclined sliding grooves at intervals in the circumferential direction, and a boss for forming a product cavity is provided on the end surface away from the column 71.

[0050] It should be noted that the upper part of the product is a circular boss with an open slot, and the lower part is a round cover with an inner ring buckle. An integral cylindrical protrusion is provided at the center of the round cover. The product is injection molded as one piece from top to bottom.

[0051] like Figure 5 As shown, the silicone core petal 8 has an end shape that matches the cavity shape of the round cover of the lower half of the product, and the number of the petals matches the number of slide grooves on the retaining sleeve 72, and the side is provided with a protrusion that matches the shape of the slide groove of the retaining sleeve 72, and the silicone core petal 8 is circumferentially embedded in the slide groove of the retaining sleeve 72; the movable template 9 has a mold core 91 on its end face away from the support plate 6, and a cavity for forming the lower half of the product is provided thereon, and a flange 92 is detachably fixed to the end face of the mold core 91 close to the support plate 6, and the flange 92 is concentric with the column 71 of the core column 7, and the movable template 9 is pressed onto the end face of the support plate 6 away from the bottom plate 1.

[0052] Combination Figure 2 and Figure 3 , the external hydraulic device drives the ejector plate to rise. In the first ejection process, the first ejector plate 3, the second ejector plate 4, and the third ejector plate 5 rise synchronously. The three ejector pins 31 arranged on the first ejector plate 3 eject the movable template 9. The annular groove at the tail of the core column 7 is engaged with the U-shaped block 61 on the support plate 6, so that the position of the core column 7 relative to the support plate 6 does not change. Since the flange 92 is fixed on the movable template 9 and abuts against the lower half of the silicone core petal 8, the silicone core petal 8 slides along the sliding groove arranged circumferentially of the core column 7 and rises with the movable template 9, so that the core column 7 is removed from the product cavity, leaving space for deformation of the lower half of the product.

[0053] During the second ejection process, the first ejection plate 3, the second ejection plate 4, and the third ejection plate 5 continue to rise synchronously until the second limit block 51 abuts against the first limit block 11. Due to the extrusion effect of the inclined surface of the through groove on the first limit block 11, the second limit block 51 contracts, causing the T-shaped limit block 32 to be inverted and separated from the second limit block 51. The end face of the third ejection plate abuts against the end face of the limit column 62 installed on the support plate 6 and stops moving. The first ejection plate 3 and the second ejection plate 4 continue to rise, and the inverted part of the product is forced to squeeze the silicone core petal 8, causing the silicone core petal 8 to gather toward the center of the mold core 91, so that the product is ejected from the mold core 91 by the ejector pin 31, completing the demolding action.

[0054] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited to the above embodiments. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of protection claimed by the utility model. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A secondary ejection demoulding mechanism, characterized in that: include: A bottom plate (1), with first limit blocks (11) symmetrically arranged on its side surfaces; Square irons (2), two in number, fixed on the end surface of the bottom plate (1); a first ejector plate (3) disposed between the two square irons (2), wherein an ejector pin (31) is disposed on the first ejector plate (3); a second ejector plate (4) disposed between the two square irons (2), the second ejector plate (4) being fixed to an end surface of the first ejector plate (3) close to the bottom plate (1); A support plate (6) which is detachably fixed to the end surface of the square iron (2), the end surface of the support plate (6) being detachably provided with a U-shaped clamping block (61), the other end surface of the support plate (6) being detachably provided with a limiting column (62), and also being provided with a through hole for passing the ejector pin (31); A core column (7) comprising a column body (71) and a retaining sleeve (72); the column body (71) is provided with an annular groove for clamping with the U-shaped clamping block (61), and is also provided with a through hole for passing the ejector pin (31); the retaining sleeve (72) is provided with an inclined sliding groove on its outer side, and a boss for forming a product is provided on its end surface; Silicone core petals (8), the number of which matches the number of the slide grooves on the retaining sleeve (72), and the side surfaces are provided with protrusions that match the shape of the slide grooves of the retaining sleeve (72), and the silicone core petals (8) are circumferentially embedded in the slide grooves of the retaining sleeve (72); The movable platen (9) has a mold core (91) on its end surface, and a flange (92) is detachably fixed to the mold core (91) on the end surface close to the support plate (6). The flange (92) is concentric with the column (71), and the movable platen (9) is pressed against the end surface of the support plate (6).

2. A secondary ejection demoulding mechanism according to claim 1, characterized in that: It also includes a third ejector plate (5), which is arranged between the two square irons (2). An open T-shaped cavity groove is arranged on the end face of the third ejector plate (5), and the end face is parallel to the mounting surface of the first limit block (11). A second limit block (51) is arranged at the lower part of the T-shaped cavity groove, and a pressure block (52) is arranged at the upper part. The pressure block (52) is detachably fixed on the third ejector plate (5), and the end face of the third ejector plate (5) abuts against the end face of the second ejector plate (4).

3. A secondary ejection demoulding mechanism according to claim 2, characterized in that: T-shaped limit blocks (32) are symmetrically fixed on both side surfaces of the first ejection plate (3), and an undercut is provided on the T-shaped limit block (32) near the rear of the bottom plate (1), which is inserted into the open slot of the first limit block (11), and the undercut abuts against the second limit block (51).

4. A secondary ejection demoulding mechanism according to claim 1, characterized in that: An open notch is provided on the end surface of the first limit block (11) away from the bottom plate (1), and an open through groove is provided on the side surface perpendicular to the end surface, wherein the through groove is in the shape of a right-angled trapezoid.

5. The secondary ejection demoulding mechanism according to claim 1, characterized in that: The ejector pins (31) are three in number and are distributed in a circular pattern around the column (71) of the core column (7). They penetrate the first ejector plate (3) and the core column (7). One end of the ejector pin (31) is fixed to the first ejector plate (3) and the other end is in contact with the product.

6. A secondary ejection demoulding mechanism according to claim 3, characterized in that: The second limit block (51) is a right prism with a right-angled trapezoidal bottom surface. A blind hole is provided on the surface away from the T-shaped limit block (32) and a gap is provided between the surface and the T-shaped cavity groove of the third ejection plate (5). A spring is provided in the blind hole, one end of the spring abuts against the second limit block (51) and the other end abuts against the third ejection plate (5).

7. The secondary ejection demoulding mechanism according to claim 1, characterized in that: The first ejection plate (3) and the second ejection plate (4) are provided with through holes having a diameter greater than that of the limiting pillars (62), and the through holes of the two plates are congruent.

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