Diagonal bracing core-pulling mechanism and injection mold

Abstract

The utility model provides an inclined strut core-pulling mechanism and an injection mold, the inclined strut core-pulling mechanism comprises a movable mold insert, a clamping piece and a driving assembly, the clamping piece comprises a first inclined strut and a second inclined strut, and the first inclined strut and the second inclined strut are both provided with fastening ends; the clamping piece and the movable mold insert are in sliding connection in the first direction so that the two fastening ends can get close to each other in the second direction to release a product or get away from each other to support the product, the first direction is perpendicular to the second direction, the ends, away from the product, of the first inclined strut and the second inclined strut are hinged to the driving assembly, and the driving assembly can drive the clamping piece to move in the first direction.

Description

Technical Field

[0001] The utility model relates to a technology for ejecting a plastic part of a small product containing an undercut, in particular to an inclined brace core pulling mechanism and an injection mold. Background Art

[0002] In order to adapt to the rapid upgrade of the consumer electronics market, the iteration speed of electronic products has accelerated, the functional requirements have become more perfect, the size has become smaller and smaller, and the internal structure of plastic parts has become more and more complex. In order to meet the assembly requirements, plastic product parts are usually equipped with buckles, but this is an undercut in mold forming, that is, the product characteristics conflict with the demoulding direction, and it cannot be directly forced out. It is necessary to use a diagonal support to push it out along the demoulding direction, and synchronously retreat a certain distance with the buckle of the product to facilitate the ejection of the product and smooth removal.

[0003] For the ejection of common plastic products, a considerable number of ejectors are usually required. During demolding, the inclined ejector cooperates with the ejector pin to overcome the clamping force generated by the shrinkage of the plastic product and eject the product. Similarly, the buckle position of the product will also have a clamping force on the diagonal brace. For ordinary plastic products, the diagonal brace usually increases the demolding angle of the product buckle to reduce the clamping force. However, for small and precise plastic products, customers have high requirements for the buckle size accuracy, and it is impossible to increase the demolding angle to a large extent. The product has a large clamping force on the diagonal brace, which makes it easy for the diagonal brace to get stuck with the product during movement, resulting in the product being unable to be removed normally.

[0004] To solve the above problems, a Figure 1-2 The core-pulling mechanism shown in the figure has a slidable connection between the diagonal brace 1 and the diagonal brace seat 2. When the diagonal brace seat 2 pushes the diagonal brace 1 to eject the product, the diagonal brace 1 and the diagonal brace seat 2 move relative to each other, so that the diagonal brace 1 is away from the buckle of the product, which is convenient for ejecting the product and removing it smoothly. However, the molds of small precision plastic products are usually compact in structure, and the diagonal brace does not have enough space to meet its strength requirements. For thin diagonal braces with a body thickness of less than 3.5 mm, the friction generated by the long-term relative movement between the diagonal brace and the diagonal brace seat during the ejection of the product often causes the diagonal brace to break. In most cases, it can only be used as a spare part to meet mass production needs, but at the same time, it causes repeated mold repair time and cost losses. Utility Model Content

[0005] The utility model aims to provide a diagonal brace core-pulling mechanism and an injection mold to solve the problem that thin diagonal braces are easy to break, thereby increasing production time and cost.

[0006] The utility model provides a diagonal brace core pulling mechanism, comprising a movable mold insert, a clamping member and a driving assembly, the clamping member comprising a first diagonal brace and a second diagonal brace, the first diagonal brace and the second diagonal brace both having a fastening end, the clamping member and the movable mold insert slidingly connected along a first direction so that the two fastening ends are close to each other along a second direction to release a product or move away from each other to support the product, the first direction is perpendicular to the second direction, the ends of the first diagonal brace and the second diagonal brace away from the product are hinged to the driving assembly, and the driving assembly can push the clamping member to move along the first direction.

[0007] In one embodiment of the utility model, the driving assembly includes an inclined support seat, and the end of the clamping member away from the product is rotatably connected to the inclined support seat, and the inclined support seat moves along the first direction to enable relative movement between the clamping member and the movable mold insert.

[0008] In one embodiment of the utility model, the diagonal support seat is provided with a first accommodating groove and a second accommodating groove, the first diagonal support has a first hinged portion that can be convexly matched with the first accommodating groove, the second diagonal support has a second hinged portion that can be convexly matched with the second accommodating groove, the first hinged portion is placed in the first accommodating groove and is rotatably connected to the diagonal support seat, and the second hinged portion is placed in the second accommodating groove and is rotatably connected to the diagonal support seat.

[0009] In one embodiment of the utility model, the diagonal support seat includes a first diagonal support seat and a second diagonal support seat, wherein one end of the first diagonal support away from the fastening end is hinged to the first diagonal support seat, and one end of the second diagonal support away from the fastening end is hinged to the second diagonal support seat.

[0010] In an embodiment of the present invention, the first diagonal brace is rotatably connected to the first diagonal brace seat in a vertical plane, and the second diagonal brace is rotatably connected to the second diagonal brace seat in the vertical plane.

[0011] In one embodiment of the utility model, a first groove is provided on the fastening end of the first diagonal support, and the first groove can be connected with the first snap-fit ​​connection of the product. A second groove is provided on the fastening end of the second diagonal support, and the second groove can be connected with the second snap-fit ​​connection of the product.

[0012] In an embodiment of the utility model, the driving assembly includes an ejector plate, and the diagonal support seat is hinged to the ejector plate.

[0013] In one embodiment of the utility model, the movable mold insert is provided with a first slide groove and a second slide groove, the extension directions of the first slide groove and the second slide groove intersect and are symmetrical about the first direction, and when the clamping member is slidably connected with the movable mold insert, the first diagonal support is slidably connected with the first slide groove along the extension direction of the first slide groove, and the second diagonal support is slidably connected with the second slide groove along the extension direction of the second slide groove.

[0014] In one embodiment of the utility model, the extension direction of the first slide groove forms a first angle with the first direction, and the extension direction of the second slide groove forms a second angle with the first direction. The first angle ranges from 5° to 30°, and the second angle ranges from 5° to 30°.

[0015] The utility model also provides an injection mold, comprising the oblique support core pulling mechanism as described above.

[0016] In the diagonal brace core pulling mechanism and injection mold of the utility model, the driving component drives the clamping part to move in the first direction and eject the product. In the process of ejecting the product, the two fastening ends supporting the product move away from each other to release the product, and the product can be taken out smoothly. The clamping part and the driving component are hinged, so that the driving component can adaptively adjust the force direction of the first diagonal brace and the second diagonal brace during the ejection process, so that the component force along the movement direction of the first diagonal brace and the second diagonal brace is increased, and the movement of the first diagonal brace and the second diagonal brace is promoted; the positive pressure perpendicular to the contact surface between the first diagonal brace / the second diagonal brace and the driving component is reduced, thereby reducing friction and reducing the risk of the first diagonal brace / the second diagonal brace breaking due to twisting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of the existing core pulling mechanism.

[0018] Figure 2 for Figure 1 A partial cross-sectional view of the core pulling mechanism shown.

[0019] Figure 3 It is a structural schematic diagram of a core pulling mechanism according to an embodiment of the utility model.

[0020] Figure 4 It is a structural schematic diagram of the core pulling mechanism of one embodiment of the utility model in the mold closing state.

[0021] Figure 5 It is a structural schematic diagram of the core pulling mechanism of one embodiment of the utility model in the ejection state.

[0022] Figure 6 It is a cross-sectional view of the core pulling mechanism of one embodiment of the utility model in the mold closing state.

[0023] Figure 7 for Figure 3 A magnified schematic diagram of center A. DETAILED DESCRIPTION

[0024] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0025] The utility model provides a diagonal brace core pulling mechanism, such as Figure 3-6 As shown, the diagonal brace core pulling mechanism of an embodiment includes a movable mold insert 11, a clamping member and a driving assembly, the clamping member includes a first diagonal brace 12 and a second diagonal brace 13, the first diagonal brace 12 has a first fastening end 123 for supporting the product 20, the second diagonal brace 13 has a second fastening end 133 for supporting the product 20, the first fastening end 123 is connected with the first snap-fit ​​connection of the product 20, and the second fastening end 133 is connected with the second snap-fit ​​connection of the product 20 to support the product 20. The clamping member and the movable mold insert 11 are slidably connected along the first direction so that the first fastening end 123 and the second fastening end 133 are moved closer to each other along the second direction to release the product 20 or moved away from each other to support the product 20, the first direction is perpendicular to the second direction, the ends of the first diagonal brace 12 and the second diagonal brace 13 away from the product 20 are hinged to the driving assembly, and the driving assembly can push the clamping member to move along the first direction.

[0026] In the diagonal brace core pulling mechanism of the utility model, the driving component drives the clamping member to move along the first direction and eject the product 20. In the process of ejecting the product 20, the two fastening ends supporting the product 20 move away from each other to release the product 20, and the product 20 can be taken out smoothly. The clamping member is hinged with the driving component, so that the driving component can adaptively adjust the force direction of the first diagonal brace 12 and the second diagonal brace 13 during the ejection process, so that the component force along the movement direction of the first diagonal brace 12 and the second diagonal brace 13 is increased, and the movement of the first diagonal brace 12 and the second diagonal brace 13 is promoted; the positive pressure perpendicular to the contact surface between the first diagonal brace 12 / the second diagonal brace 13 and the driving component is reduced, thereby reducing friction and reducing the risk of the first diagonal brace 12 / the second diagonal brace 13 breaking due to distortion.

[0027] For ease of description and understanding, the first direction is defined as an up-and-down direction, and the second direction is defined as a left-and-right direction.

[0028] The inclined brace core pulling mechanism in this embodiment is mainly used in an injection mold (not shown) to eject the finished plastic product from the mold. The inclined brace core pulling mechanism specifically includes two states, namely, a mold closing state and an ejection state. Figure 4 As shown, at this time, the diagonal support core pulling mechanism is in the mold closing state, and the product 20 is injection molded by the injection mold. Then, the diagonal support core pulling mechanism needs to be switched from the mold closing state to the ejection state, as shown in FIG. Figure 5As shown, switching to the ejection state facilitates the removal of the product 20. In the mold closing state, the first diagonal brace 12 is plugged into the first buckle of the product 20 through the first fastening end 123, and the second diagonal brace 13 is plugged into the second slot of the product 20 through the second fastening end 133. In this embodiment, the first diagonal brace 12 and the second diagonal brace 13 are located inside the product 20, that is, the first fastening end 123 and the second fastening end 133 are located inside the product 20. The first diagonal brace 12 and the second diagonal brace 13 are plugged into and matched with the product 20 through the first fastening end 123 and the second fastening end 133, while providing an upward supporting force for the product, thereby supporting and fixing the product 20; The rear clamping member provides an upward thrust, and the clamping member simultaneously drives the product 20 to move upward to eject the product 20. When the clamping member moves upward, the first fastening end 123 moves to the right to separate the first fastening end 123 from the first buckle of the product, and the second fastening end 133 moves to the left to separate the second fastening end 133 from the second buckle of the product. The first fastening end 123 and the second fastening end 133 move toward each other and away from the first buckle and the second buckle of the product 20, so that the product will not stick to the first diagonal support 12 and the second diagonal support 13, which will make it difficult to remove the product 20 or even damage the product 20.

[0029] In this embodiment, the driving assembly includes an inclined support seat 14 , and one end of the clamping member away from the product 20 is rotatably connected to the inclined support seat 14 . The inclined support seat 14 moves in the up and down direction to drive the relative movement between the clamping member and the movable mold insert 11 .

[0030] Specifically, the diagonal support seat 14 is provided with a first accommodating groove 141 and a second accommodating groove 142, the first diagonal support 12 has a first hinged portion 121 that can be matched with the first accommodating groove 141, and the second diagonal support 13 has a second hinged portion 131 that can be matched with the second accommodating groove 142. The first hinged portion 121 is placed in the first accommodating groove 141 and is rotatably connected to the diagonal support seat 14, and the second hinged portion 131 is placed in the second accommodating groove 142 and is rotatably connected to the diagonal support seat 14.

[0031] Specifically, the first accommodating groove 141 and the second accommodating groove 142 have the same structure. Taking the first accommodating groove 141 as an example, the first accommodating groove 141 extends to two opposite end faces of the diagonal support seat 14 in a direction perpendicular to the vertical plane. The groove wall of the first accommodating groove 141 is an arc-shaped wall surface, and the cross-sectional area of ​​the first accommodating groove 141 in the vertical plane gradually increases from top to bottom. The outer shape structure of the first hinge 121 matches the first accommodating groove 141, and the first diagonal support is placed in the first accommodating groove 141 through the first hinge 121 and can rotate relative to the diagonal support seat 14 in the vertical plane.

[0032] In the prior art, the fundamental reason why the diagonal brace will break is due to the clamping force of the product on the diagonal brace, and the torque generated on the diagonal brace by the friction generated by the relative movement between the diagonal brace and the diagonal brace seat. The space available for modification of small and precise products is limited. Only by reducing the friction between the diagonal brace seat and the diagonal brace can the torque generated be minimized to the greatest extent, thereby reducing the risk of breakage. In this embodiment, the connection between the first diagonal strut 12 and the diagonal strut seat 14, and the connection between the second diagonal strut 13 and the diagonal strut seat 14 are designed to be changed from a sliding connection to a rotating connection. Taking the connection between the first diagonal strut 12 and the diagonal strut seat 14 as an example, the first diagonal strut 12 can rotate around the connection with the diagonal strut seat 14. In the process of the diagonal strut seat 14 pushing the first diagonal strut 12 to move, the moving pair between the first diagonal strut 12 and the diagonal strut seat 14 is changed to a rotating pair, so that the diagonal strut seat 14 can adaptively adjust the force direction of the first diagonal strut 12 during the ejection process, increase the component force along the movement direction of the first diagonal strut 12, promote the movement of the first diagonal strut 12, and reduce the positive pressure perpendicular to the contact surface between the first diagonal strut 12 and the diagonal strut seat 14, thereby reducing friction and reducing the risk of the first diagonal strut 12 breaking due to twisting.

[0033] It can be understood that sliding connection and rotational connection are two common connection methods. Sliding connection usually involves relative sliding between two surfaces, while rotational connection is the relative rotation between two parts centered on a point or axis. There are differences in the friction characteristics and torque bearing capacity of these two connection methods. When the diagonal support (first diagonal support 12 / second diagonal support 13) and the diagonal support seat 14 are in a sliding connection, the diagonal support (first diagonal support 12 / second diagonal support 13) needs to slide and rub against the surface of the diagonal support seat 14 when switching from the mold closing state to the ejection state, which will generate greater friction. This friction not only consumes energy, but also generates torque on the diagonal support, increasing the risk of diagonal support breakage. The reasons why rotary connections can reduce friction and lower torque are: 1) Difference in friction coefficient: Generally, the sliding friction coefficient is greater than the rolling friction coefficient. Rotary connections (such as bearings) usually use rolling elements (such as balls or rollers) to reduce the friction of the contact surface. Even in the absence of special rolling elements, rotary connections may be designed to reduce the contact area and contact pressure, thereby reducing friction; 2) Torque transmission characteristics: In rotary connections, torque is transmitted through a rotating shaft, which is usually more effective than sliding contact. Using a rotary connection between the brace seat 14 and the brace can make the torque transmission path more direct and reduce the additional torque caused by friction; 3) Force direction adjustment: By changing the moving pair to a rotating pair, the brace seat can adapt the force direction of the brace to the force direction of the brace, which means that the force on the brace during the core pulling process is more ideal, which can promote the movement of the brace and reduce unnecessary friction.

[0034] In another preferred embodiment, the diagonal support seat 14 includes a first diagonal support seat 143 and a second diagonal support seat 144, and one end of the first diagonal support 12 away from the fastening end is hinged to the first diagonal support seat 143, and one end of the second diagonal support 13 away from the fastening end is hinged to the second diagonal support seat 144. Specifically, the first diagonal support 12 is rotatably connected to the first diagonal support seat 143 in a vertical plane, and the second diagonal support 13 is rotatably connected to the second diagonal support seat 144 in a vertical plane. It can be understood that the first diagonal support 12 can rotate relative to the first diagonal support seat 143 in a vertical plane, and the second diagonal support 13 can rotate relative to the second diagonal support seat 144 in a vertical plane.

[0035] In this embodiment, Figure 6-7 As shown, a first groove 122 is provided on the fastening end of the first diagonal brace 12, and the first groove 122 can be connected with the first buckle of the product 20 in cooperation, and a second groove 132 is provided on the fastening end of the second diagonal brace 13, and the second groove 132 can be connected with the second buckle of the product 20 in cooperation. It should be noted that the first buckle and the second buckle of the product 20 in this embodiment are located inside the product 20, the first fastening end 123 of the first diagonal brace 12 and the second fastening end 133 of the second diagonal brace 13 are located inside the product 20, and the first fastening end 123 and the second fastening end 133 are respectively connected with the first buckle and the second buckle to support the product 20. When the inclined support seat 14 pushes the clamping part to move upward, the first fastening end 123 and the second fastening end 133 move closer to each other. At this time, the first fastening end 123 moves to the right along the inner wall of the product 20 and away from the first buckle, and the second fastening end 133 moves to the left along the inner wall of the product 20 and away from the second buckle. Then the product 20 can be removed smoothly.

[0036] In this embodiment, the driving assembly includes an ejector plate (not shown), and the diagonal support seat 14 is hinged to the ejector plate. Specifically, the first diagonal support seat 143 and the second diagonal support seat 144 are respectively hinged to the ejector plate, that is, rotatably connected. The end of the first diagonal support seat 143 away from the first diagonal support 12 is hinged to the ejector plate by setting a pin, and the end of the second diagonal support seat 144 away from the second diagonal support 13 is hinged to the ejector plate by setting a pin. The first diagonal support seat 143 and the second diagonal support seat 144 both use the pin as the rotation center. In the process of switching from the mold closing state to the ejection state, the ejector plate pushes the first diagonal support seat 143 and the second diagonal support seat 144 upward to move, and the first diagonal support seat 143 and the second diagonal support seat 144 respectively push the first diagonal support 12 and the second diagonal support 13 to move.

[0037] In this embodiment, the movable mold insert 11 is provided with a first slide groove 111 and a second slide groove 112. The extension directions of the first slide groove 111 and the second slide groove 112 intersect and are symmetrical about the up and down directions. When the clamping member slides with the movable mold insert 11, the first diagonal brace 12 slides with the first slide groove 111 along the extension direction of the first slide groove 111, and the second diagonal brace 13 slides with the second slide groove 112 along the extension direction of the second slide groove 112.

[0038] Specifically, the extension direction of the first slide groove 111 forms a first angle with the up-down direction, and the extension direction of the second slide groove 112 forms a second angle with the up-down direction, so that when the first diagonal brace 12 moves along the first slide groove 111 and the second diagonal brace 13 moves along the second slide groove 112, the first fastening end 123 and the second fastening end 133 move along the left-right direction to move away from the product 20. The first angle is in the range of 5° to 30°, and the second angle is in the range of 5° to 30°. Those skilled in the art can set the first angle to 5°, 7°, 8°, 10°, 11°, 13°, 15°, 17°, 18°, 20°, 22°, 24°, 25°, 26°, 28°, 30°, etc. according to actual needs, and no sole limitation is made here; those skilled in the art can set the second angle to 5°, 7°, 8°, 10°, 11°, 13°, 15°, 17°, 18°, 20°, 22°, 24°, 25°, 26°, 28°, 30°, etc. according to actual needs, and no sole limitation is made here.

[0039] In another preferred embodiment, the first diagonal brace 12 and the second diagonal brace 13 are symmetrically arranged about the up-down direction, that is, the first angle is equal to the second angle.

[0040] The utility model also provides an injection mold, comprising the above-mentioned oblique support core pulling mechanism.

[0041] In this document, unless otherwise specified or limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0042] In this document, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are only for the clarity of the technical solution and the convenience of description. Therefore, they should not be understood as limitations on the present invention.

[0043] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0044] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A diagonal brace core pulling mechanism, characterized in that: The invention comprises a movable mold insert (11), a clamping member and a driving assembly, wherein the clamping member comprises a first diagonal support (12) and a second diagonal support (13), wherein the first diagonal support (12) and the second diagonal support (13) both have a fastening end, and the clamping member is slidably connected with the movable mold insert (11) along a first direction so that the two fastening ends are moved closer to each other along a second direction to release the product or moved away from each other to support the product, wherein the first direction is perpendicular to the second direction, and the ends of the first diagonal support (12) and the second diagonal support (13) away from the product are hinged to the driving assembly, and the driving assembly can push the clamping member to move along the first direction.

2. The diagonal brace core pulling mechanism according to claim 1, characterized in that: The driving assembly comprises an inclined support seat (14), one end of the clamping member away from the product is rotatably connected to the inclined support seat (14), and the inclined support seat (14) moves along the first direction to enable relative movement between the clamping member and the movable mold insert (11).

3. The diagonal brace core pulling mechanism according to claim 2, characterized in that: The diagonal support seat (14) is provided with a first accommodating groove (141) and a second accommodating groove (142); the first diagonal support (12) has a first hinged portion (121) capable of convexo-concavely matching with the first accommodating groove (141); the second diagonal support (13) has a second hinged portion (131) capable of convexo-concavely matching with the second accommodating groove (142); the first hinged portion (121) is disposed in the first accommodating groove (141) and is rotatably connected to the diagonal support seat (14); the second hinged portion (131) is disposed in the second accommodating groove (142) and is rotatably connected to the diagonal support seat (14).

4. The diagonal brace core pulling mechanism according to claim 2, characterized in that: The diagonal support seat (14) comprises a first diagonal support seat (143) and a second diagonal support seat (144); an end of the first diagonal support (12) away from the fastening end is hinged to the first diagonal support seat (143); and an end of the second diagonal support (13) away from the fastening end is hinged to the second diagonal support seat (144).

5. The diagonal brace core pulling mechanism according to claim 4, characterized in that: The first diagonal support (12) is rotatably connected to the first diagonal support seat (143) in a vertical plane, and the second diagonal support (13) is rotatably connected to the second diagonal support seat (144) in the vertical plane.

6. The diagonal brace core pulling mechanism according to claim 1, characterized in that: A first groove (122) is provided on the fastening end of the first diagonal brace (12), and the first groove (122) can be connected with a first snap-fit ​​connection of the product. A second groove (132) is provided on the fastening end of the second diagonal brace (13), and the second groove (132) can be connected with a second snap-fit ​​connection of the product.

7. The diagonal brace core pulling mechanism according to claim 2, characterized in that: The driving assembly comprises an ejector plate, and the diagonal support seat (14) is hinged to the ejector plate.

8. The diagonal brace core pulling mechanism according to claim 1, characterized in that: The movable mold insert (11) is provided with a first slide groove (111) and a second slide groove (112), and the extension directions of the first slide groove (111) and the second slide groove (112) intersect and are symmetrical about the first direction. When the clamping member is slidably connected with the movable mold insert (11), the first diagonal support (12) is slidably connected with the first slide groove (111) along the extension direction of the first slide groove (111), and the second diagonal support (13) is slidably connected with the second slide groove (112) along the extension direction of the second slide groove (112).

9. The diagonal brace core pulling mechanism according to claim 8, characterized in that: The extension direction of the first slide groove (111) forms a first angle with the first direction, and the extension direction of the second slide groove (112) forms a second angle with the first direction. The first angle ranges from 5° to 30°, and the second angle ranges from 5° to 30°.

10. An injection mold, characterized in that: It comprises the diagonal brace core pulling mechanism as described in any one of claims 1 to 9.

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