Mold ejection mechanism for product with convex rib

Abstract

The utility model discloses a die ejection mechanism for a product with a convex rib, which comprises a sliding block contacted with a workpiece; the sliding block is provided with a through channel for containing the vibrating needle, and the length of the through channel is smaller than that of the vibrating needle; the wear-resisting plate is in contact with the sliding block through an inclined plane, the inclined plane and the vibrating needle form a non-right-angle included angle, the wear-resisting plate and the sliding block have relative linear translation freedom degrees parallel to the inclined plane in contact with each other, and a pit is formed in the contact surface of the wear-resisting plate and the sliding block; the vibrating needle has elastic potential energy facing the wear-resisting plate, one end of the vibrating needle selectively makes contact with the pit, and the other end of the vibrating needle selectively makes contact with the workpiece. By means of sliding of the sliding block and the wear-resisting plate, one end of the vibrating needle enters the concave pit of the wear-resisting plate or leaves the concave pit, and then the other end of the vibrating needle is ejected out or retracted back. When one end of the bouncing needle runs out of the concave pit, the other end of the bouncing needle is ejected out to counteract the height difference of the convex rib of the product workpiece, so that the problems of adhesion and strain during demolding of an injection product are solved.

Description

Technical Field

[0001] The utility model relates to the field of injection mold parts, in particular to a mold ejection mechanism for products with convex ribs. Background Art

[0002] Many electrical components are composite products of metal and plastic, where the metal is responsible for conducting electricity and the outer plastic is responsible for insulation. Some injection molded products have many ribs on the outer wall, and the difference between the top and the root of the ribs constitutes deep ribs. When the injection mold is demolded, these deep ribs have a strong clamping force, which is prone to adhesion and product deformation.

[0003] The product needs to be ejected in a targeted manner to avoid adhesion and strain at the deep ribs. However, the existing ejection needle mechanism is not suitable for some crowded real-world situations. Utility Model Content

[0004] The problem to be solved by the utility model is to provide a mold ejection mechanism for products with convex ribs, which utilizes the sliding of a slider and a wear-resistant plate to allow one end of an elastic needle to enter or leave the concave pit of the wear-resistant plate, and then allow the other end of the elastic needle to be ejected or retracted. When one end of the elastic needle runs out of the concave pit, the other end of the elastic needle is ejected to offset the height difference of the convex rib of the product workpiece, thereby solving the adhesion and strain problems of the injection molded product during demoulding.

[0005] In order to solve the above problems, the utility model provides a mold ejection mechanism for products with convex ribs. In order to achieve the above purpose, the technical solution adopted by the utility model to solve its technical problems is:

[0006] A mold ejection mechanism for a product with convex ribs comprises: a slider in contact with a workpiece; an elastic pin, the slider having a through passage for accommodating the elastic pin, the length of the through passage being less than the length of the elastic pin; a wear-resistant plate in contact with the slider via an inclined surface, the inclined surface and the elastic pin forming a non-right angle, the wear-resistant plate and the slider having a relative straight line translation freedom parallel to the mutually contacting inclined surfaces, the contact surface between the wear-resistant plate and the slider having a pit; the elastic pin having elastic potential energy toward the wear-resistant plate, one end of the elastic pin selectively contacting the pit, and the other end of the elastic pin selectively contacting the workpiece.

[0007] The beneficial effect of adopting the above technical solution is: in order to solve the problem that there are many and high ribs on the injection molded product, resulting in a large clamping force during demoulding, and the slider is prone to adhesion and strain on the injection molded product when withdrawing. The ejection mechanism uses the outward ejection action of the spring pin to offset the height difference of the ribs, ensuring that the product workpiece will not adhere when the slider withdraws.

[0008] This mechanism uses the sliding of the slider and the wear-resistant plate to allow one end of the spring pin to enter or leave the pit of the wear-resistant plate, and then the other end of the spring pin is ejected or retracted. When one end of the spring pin runs out of the pit, the other end of the spring pin is ejected. The ejection stroke of the spring pin is enough to allow the product workpiece to detach from the slider to avoid the adhesion of its own ribs.

[0009] The entire mechanism is simple and reliable, requires very little space, and can be used in many injection molds.

[0010] As a further improvement of the utility model, the inner wall of the pit includes a first flat surface and a second flat surface, and the intersections of the first flat surface, the second flat surface and the outer surface of the wear-resistant plate form a positive angle with an obtuse angle; the first flat surface is perpendicular to the length direction of the elastic needle, and the second flat surface is parallel to the length direction of the elastic needle.

[0011] The beneficial effect of adopting the above technical solution is that the pit and the spring needle are mainly in contact with two slope surfaces, and the oblique angles of the slope surfaces themselves make the spring needle encounter little resistance when sliding into or out of the pit.

[0012] As a further improvement of the utility model, the obtuse angle at the junction of the first flat surface and the surface of the wear-resistant plate is greater than the obtuse angle at the junction of the second flat surface and the surface of the wear-resistant plate.

[0013] The beneficial effect of adopting the above technical solution is that one end of the spring needle is mainly in contact with the first flat surface, so the larger the obtuse angle is, the smoother the spring needle is when it enters and exits the pit.

[0014] As a further improvement of the utility model, a shovel base is fixed to a side of the wear-resistant plate away from the slider, and the shovel base and the wear-resistant plate have the freedom of linear reciprocating motion along a direction perpendicular to the length of the spring needle.

[0015] The beneficial effect of adopting the above technical solution is that the shovel base drives the wear-resistant plate to move together, and the movement of the shovel base can also drive the slider to move relative to each other.

[0016] As a further improvement of the utility model, the slider includes a slider seat and a slider insert, the slider seat has an upper inclined surface in contact with the wear-resistant plate, and the slider insert is in contact with the workpiece; the slider insert has a first step hole, and the slider seat has a second step hole, the first step hole and the second step hole are coaxially connected to form a through channel.

[0017] The beneficial effect of adopting the above technical solution is that the slider is composed of two independent parts, which facilitates the processing of the first step hole and the second step hole, and also facilitates the assembly of the spring pin.

[0018] As a further improvement of the present invention, a coaxial fixing hole is provided between the slider seat and the slider insert, and the fixing hole is equipped with a bolt that fixes the slider seat and the slider insert to each other; the slider seat has a limiting pit on the side facing the slider insert, and the slider insert and the bottom and side surfaces of the limiting pit are in surface contact.

[0019] The beneficial effect of adopting the above technical solution is that the limiting pits and the bolts ensure that the slider seat and the slider insert have sufficient structural stability after being assembled and are not easy to loosen.

[0020] As a further improvement of the utility model, the first step hole has a first thickened hole at one end facing the slider seat, and the second step hole has a second thickened hole at one end facing the slider insert; the spring needle has a radially thickened spring needle stop, and the spring needle stop is located in the first thickened hole or the second thickened hole.

[0021] The beneficial effect of adopting the above technical solution is that the first thickened hole and the second thickened hole are combined with each other to form a space for accommodating the stop position of the elastic needle, thereby defining two extreme positions of the translation of the elastic needle.

[0022] As a further improvement of the utility model, the axial length of the second thickened hole is equal to the axial length of the elastic needle stop, the axial length of the first thickened hole is greater than the axial length of the elastic needle stop, and a compression spring is arranged in the first thickened hole.

[0023] The beneficial effect of adopting the above technical solution is that the relatively long first thickened hole facilitates the layout of the compression spring, and the compression spring provides unidirectional elastic potential energy to the spring needle, so that the spring needle has the elastic force to automatically retract.

[0024] As a further improvement of the present invention, when the spring needle stops contacting the bottom surface of the second thickened hole, one end of the spring needle extends into the pit, and the other end of the spring needle is flush with the outer surface of the slider; when one end of the spring needle contacts the outer surface of the wear-resistant plate outside the pit, the other end of the spring needle emerges from the slider.

[0025] The beneficial effect of adopting the above technical solution is that the length and layout of the spring pin can ensure that its ejection or retraction and contact with the pit are completely synchronous and linked.

[0026] As a further improvement of the utility model, the surface of the workpiece is provided with convex ribs, and the surface of the slider is provided with matching grooves which are concavely and convexly matched with the convex ribs.

[0027] The beneficial effect of adopting the above technical solution is that the matching groove of the slider is used to participate in the molding of the injection molded workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a stereogram of one embodiment of the product;

[0030] Figure 2 It is a structural schematic diagram of an implementation mode of the utility model;

[0031] Figure 3 It is a structural schematic diagram of an implementation mode of the utility model;

[0032] Figure 4 It is a front view of a wear-resistant plate, a spring pin and a compression spring in one embodiment of the utility model.

[0033] 1-shovel base; 2-wear-resistant plate; 21-pit; 211-first flat surface; 212-second flat surface; 3-slider seat; 31-second step hole; 311-second thickened hole; 32-fixing hole; 33-upper inclined surface; 34-limiting pit; 4-elastic pin; 41-elastic pin stop; 42-first shaft rod; 43-second shaft rod; 44-protruding end; 5-compression spring; 6-slider insert; 61-first step hole; 611-first thickened hole; 62-matching groove; 7-workpiece; 71-convex rib. DETAILED DESCRIPTION

[0034] The following is a further detailed description of the present invention in conjunction with specific embodiments:

[0035] In order to achieve the purpose of the utility model, a mold ejection mechanism for a product with convex ribs includes: a slider, which contacts a workpiece 7; a spring pin 4, the slider has a through channel for accommodating the spring pin 4, and the length of the through channel is less than the length of the spring pin 4; a wear-resistant plate 2, which contacts the slider through an inclined surface, the inclined surface and the spring pin 4 are at a non-right angle, the wear-resistant plate 2 and the slider have a relative straight line translation freedom parallel to the mutually contacting inclined surfaces, and the contact surface between the wear-resistant plate 2 and the slider is provided with a pit 21; the spring pin 4 has elastic potential energy toward the wear-resistant plate 2, one end of the spring pin 4 selectively contacts the pit 21, and the other end of the spring pin 4 selectively contacts the workpiece 7.

[0036] like Figure 1 As shown, the workpiece 7 can also be called a product. The main structure of the workpiece 7 includes an internal metal conductive sheet and a plastic body that is injection-molded and wrapped around the metal conductive sheet. A plurality of convex ribs 71 are protruded from the outer wall of the plastic body.

[0037] The beneficial effects of adopting the above technical solution are: it addresses the phenomenon that there are many ribs on the injection molded product and the ribs are high, resulting in a large clamping force during demoulding, and the slider is prone to adhesion and strain to the injection molded product when withdrawing. This ejection mechanism uses the outward ejection action of the spring pin to offset the height difference of the ribs, ensuring that the product workpiece will not adhere when the slider withdraws. This mechanism uses the sliding of the slider and the wear-resistant plate to allow one end of the spring pin to enter the pit of the wear-resistant plate or leave the pit of the wear-resistant plate, and then allow the other end of the spring pin to be ejected or retracted. When one end of the spring pin runs out of the pit, the other end of the spring pin is ejected, and the ejection stroke of the spring pin is sufficient to allow the product workpiece to detach from the slider, avoiding the adhesion of its own ribs. The entire mechanism is simple and reliable, requires very little space, and can be used in many injection molds.

[0038] In other embodiments of the present invention, Figure 4 As shown, the inner wall of the pit 21 includes a first flat surface 211 and a second flat surface 212. The intersections of the first flat surface 211, the second flat surface 212 and the outer surface of the wear-resistant plate 2 form a positive angle with an obtuse angle; the first flat surface 211 is perpendicular to the length direction of the elastic needle 4, and the second flat surface 212 is parallel to the length direction of the elastic needle 4.

[0039] The beneficial effect of adopting the above technical solution is that the pit and the spring needle are mainly in contact with two slope surfaces, and the oblique angles of the slope surfaces themselves make the spring needle encounter little resistance when sliding into or out of the pit.

[0040] In some other embodiments of the present invention, the obtuse angle at the junction of the first straight surface 211 and the surface of the wear-resistant plate 2 is greater than the obtuse angle at the junction of the second straight surface 212 and the surface of the wear-resistant plate 2 .

[0041] The beneficial effect of adopting the above technical solution is that one end of the spring needle is mainly in contact with the first flat surface, so the larger the obtuse angle is, the smoother the spring needle is when it enters and exits the pit.

[0042] In other embodiments of the present invention, a shovel base 1 is fixed to a side of the wear-resistant plate 2 facing away from the slider, and the shovel base 1 and the wear-resistant plate 2 have the freedom of linear reciprocating motion along a direction perpendicular to the length of the spring pin 4 .

[0043] The beneficial effect of adopting the above technical solution is that the shovel base drives the wear-resistant plate to move together, and the movement of the shovel base can also drive the slider to move relative to each other.

[0044] In other embodiments of the present invention, the slider includes a slider seat 3 and a slider insert 6. The slider seat 3 has an upper inclined surface 33 in contact with the wear-resistant plate 2, and the slider insert 6 is in contact with the workpiece 7. The slider insert 6 has a first step hole 61, and the slider seat 3 has a second step hole 31. The first step hole 61 is coaxially connected to the second step hole 31 to form a through channel.

[0045] The beneficial effect of adopting the above technical solution is that the slider is composed of two independent parts, which facilitates the processing of the first step hole and the second step hole, and also facilitates the assembly of the spring pin.

[0046] In other embodiments of the utility model, a coaxial fixing hole 32 is provided between the slider seat 3 and the slider insert 6, and the fixing hole 32 is equipped with a bolt that fixes the slider seat 3 and the slider insert 6 to each other (the bolt is in a hidden state not shown in the accompanying drawings); the slider seat 3 has a limiting pit 34 on one side facing the slider insert 6, and the slider insert 6 and the bottom surface of the limiting pit 34 and the side surface of the limiting pit 34 all constitute surface contact fixation.

[0047] The beneficial effect of adopting the above technical solution is that the limiting pits and the bolts ensure that the slider seat and the slider insert have sufficient structural stability after being assembled and are not easy to loosen.

[0048] In other embodiments of the present invention, the first step hole 61 has a first thickened hole 611 at one end facing the slider seat 3, and the second step hole 31 has a second thickened hole 311 at one end facing the slider insert 6; the spring pin 4 has a radially thickened spring pin stop 41, and the spring pin stop 41 is located in the first thickened hole 611 or the second thickened hole 311.

[0049] like Figure 1 As shown, the spring needle stopper 41 divides the spring needle 4 into a first shaft rod 42 and a second shaft rod 43. The first shaft rod 42 is located in the first step hole 61, and the second shaft rod 43 is located in the second step hole 31. The diameters of the first shaft rod 42 and the second shaft rod 43 are both smaller than the diameter of the spring needle stopper 41.

[0050] The beneficial effect of adopting the above technical solution is that the first thickened hole and the second thickened hole are combined with each other to form a space for accommodating the stop position of the elastic needle, thereby defining two extreme positions of the translation of the elastic needle.

[0051] In other embodiments of the present invention, the axial length of the second thickened hole 311 is equal to the axial length of the elastic needle stop 41 , the axial length of the first thickened hole 611 is greater than the axial length of the elastic needle stop 41 , and a compression spring 5 is arranged in the first thickened hole 611 .

[0052] The beneficial effect of adopting the above technical solution is that the relatively long first thickened hole facilitates the layout of the compression spring, and the compression spring provides unidirectional elastic potential energy to the spring needle, so that the spring needle has the elastic force to automatically retract.

[0053] In other embodiments of the present invention, when the spring needle stop 41 contacts the bottom surface of the second thickened hole 311, one end of the spring needle 4 extends into the pit 21, and the other end of the spring needle 4 is flush with the outer surface of the slider; when one end of the spring needle 4 contacts the outer surface of the wear-resistant plate 2 outside the pit 21, the other end of the spring needle 4 emerges from the slider.

[0054] When one end of the spring pin 4 contacts the outer surface of the wear-resistant plate 2 outside the pit 21, the distance that the other end of the spring pin 4 emerges from the slider is the pop-up stroke, and the length of the pop-up stroke is not less than the height of the rib 71. One end of the spring pin 4 contacts the surface of the product 7 on one side of the root of the rib 71.

[0055] The beneficial effect of adopting the above technical solution is that the length and layout of the spring pin can ensure that its ejection or retraction and contact with the pit are completely synchronous and linked.

[0056] In some other embodiments of the present invention, the surface of the workpiece 7 has a convex rib 71 , and the outer surface of the slider insert 6 has a matching groove 62 that matches the convex rib 71 in concave and convex manner.

[0057] The beneficial effect of adopting the above technical solution is that the matching groove of the slider is used to participate in the molding of the injection molded workpiece.

[0058] like Figure 1 As shown, the spring pin 4 is arranged in the horizontal direction, the first flat surface 211 is arranged in the vertical direction, and the second flat surface 212 is arranged in the horizontal direction. The degree of the acute angle between the wear-resistant plate 2 and the horizontal is in the range of 55° to 65°.

[0059] The action principle of this ejection mechanism:

[0060] (1) Before mold closing, the spring pin 4 is fixed in the slider seat 3 and the slider insert 6 because of the spring pin stop 41 and the spring 5.

[0061] (2) When the mold is closed, the spring pin 4 contacts the inclined surface of the wear-resistant plate 2 and is first extended forward by force. Then, due to the avoidance position of the flat position of the wear-resistant plate 2, the spring pin 4 is forced back by the spring 5 and returns to its original position.

[0062] (3) After the injection molding is completed, the mold is opened, and as the shovel base 1 and the wear-resistant block 2 move upward, the slider insert 6 moves backward synchronously until the surface of the wear-resistant block 2 contacts the spring pin 4, forcing the spring pin 4 to move forward, thereby achieving the effect of supporting the plastic workpiece 7; because the slider insert 6 is retreating and leaving the glue position, and the spring pin 4 continues to support the glue position for a period of time, the effect of helping the workpiece 7 to separate from the slider insert 6 is achieved.

[0063] In order to clearly express the structural principle, Figure 2 , Figure 3 The structural diagram is also a cross-sectional view. Figure 3 compared to Figure 2 , Figure 3 Artifact 7 is hidden in Figure 3 The spring pin in the middle is also in the ejected state, and one end of the first shaft rod 42 constitutes an ejected end 44.

[0064] Figure 1 The workpiece 7 is only an example, and its main specifications and shape are not the issues discussed in this technical solution. The main issue that needs to be considered during its injection molding and stripping is the relatively complex ribs 71 on its surface.

[0065] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A mold ejection mechanism for a product with convex ribs, characterized in that: include: a slider, in contact with the workpiece; The slide block has a through passage for accommodating the spring needle, and the length of the through passage is less than the length of the spring needle; The wear-resistant plate contacts the slider via an inclined surface, the inclined surface forms a non-right angle with the spring pin, the wear-resistant plate and the slider have a relative linear translation freedom along the inclined surfaces in contact with each other, and the contact surface between the wear-resistant plate and the slider is provided with a pit; The spring pin has elastic potential energy toward the wear-resistant plate, one end of the spring pin selectively contacts the pit, and the other end of the spring pin selectively contacts the workpiece.

2. The mold ejection mechanism for products with convex ribs according to claim 1, characterized in that: The inner wall of the pit includes a first flat surface and a second flat surface. The intersections of the first flat surface, the second flat surface and the outer surface of the wear-resistant plate form a positive angle with an obtuse angle; the first flat surface is perpendicular to the length direction of the elastic needle, and the second flat surface is parallel to the length direction of the elastic needle.

3. The mold ejection mechanism for products with convex ribs according to claim 2, characterized in that: The obtuse angle at the junction of the first straight surface and the surface of the wear-resistant plate is greater than the obtuse angle at the junction of the second straight surface and the surface of the wear-resistant plate.

4. The mold ejection mechanism for products with convex ribs according to claim 1, characterized in that: A shovel base is fixed to a side of the wear-resistant plate away from the sliding block, and the shovel base and the wear-resistant plate have a linear reciprocating motion freedom along a direction perpendicular to the length of the spring needle.

5. The mold ejection mechanism for products with convex ribs according to claim 1, characterized in that: The slider includes a slider seat and a slider insert, wherein the slider seat has an upper inclined surface in contact with the wear-resistant plate, and the slider insert is in contact with the workpiece; The slider insert has a first step hole, and the slider seat has a second step hole. The first step hole and the second step hole are coaxially connected to form a through passage.

6. The mold ejection mechanism for products with convex ribs according to claim 5, characterized in that: A coaxial fixing hole is provided between the slider seat and the slider insert, and a bolt is installed in the fixing hole to fix the slider seat and the slider insert to each other; The slider seat has a limiting pit on one side facing the slider insert, and the slider insert is in surface contact with the bottom and side surfaces of the limiting pit.

7. The mold ejection mechanism for products with convex ribs according to claim 5, characterized in that: The first step hole has a first thickened hole at one end facing the slider seat, and the second step hole has a second thickened hole at one end facing the slider insert; the elastic needle has a radially thickened elastic needle stop, and the elastic needle stop is located in the first thickened hole or the second thickened hole.

8. The mold ejection mechanism for products with convex ribs according to claim 7, characterized in that: The axial length of the second thickened hole is equal to the axial length of the elastic needle stop, the axial length of the first thickened hole is greater than the axial length of the elastic needle stop, and a compression spring is arranged in the first thickened hole.

9. The mold ejection mechanism for products with convex ribs according to claim 7, characterized in that: When the spring pin stops contacting the bottom surface of the second thickened hole, one end of the spring pin extends into the pit, and the other end of the spring pin is flush with the outer surface of the slider; when one end of the spring pin contacts the outer surface of the wear-resistant plate outside the pit, the other end of the spring pin emerges from the slider.

10. The mold ejection mechanism for products with ribs according to claim 1, characterized in that: The workpiece surface is provided with convex ribs, and the sliding block surface is provided with matching grooves which match the convex ribs.

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