Mold locking mechanism and injection molding machine

Abstract

The application provides a clamping mechanism and an injection molding machine. The clamping mechanism comprises a movable mold plate, a fixed mold plate and a plurality of tie rods. The movable mold plate comprises a first base and a first end plate. The first base is configured to be in transmission connection with a movable mold plate driving device. One side surface of the first end plate is arranged correspondingly to the first base. A boss is arranged on the side surface of the first end plate. At least one first support rib and at least one second support rib are arranged on the first base. The first support rib and the second support rib are both extended from the first base to the boss and connected with the boss. The two support ribs are arranged in a V shape with the top surface center line of the boss as the axis of symmetry. The distance between the first support rib and the second support rib gradually decreases in the direction from the first base to the first end plate. The fixed mold plate is fixed at one end of the plurality of tie rods and located on the side of the first end plate away from the first base. The movable mold plate can move towards or away from the fixed mold plate along the length direction of the tie rods. The clamping force of the clamping mechanism is more evenly distributed.

Description

Technical Field

[0001] This utility model relates to the field of injection molding machines, and in particular to a mold clamping mechanism and an injection molding machine. Background Technology

[0002] An injection molding machine is a device that uses an injection unit to inject molten plastic into a mold to produce molded plastic products. To prevent the mold from being pushed open by the molten plastic during the injection process, injection molding machines are usually equipped with a mold clamping mechanism to lock the mold in place. Generally, the mold clamping mechanism consists of a moving mold plate, a fixed mold plate, and a moving mold plate drive device. The moving mold plate is a plate or shell with a certain thickness. The moving mold plate drive device is connected to both ends of the moving mold plate in the vertical direction, providing driving force to support the two ends of the moving mold plate in the vertical direction, so that the moving mold plate presses the mold between the moving mold plate and the fixed mold plate under the support of the driving force.

[0003] In the process of developing this utility model, the inventors discovered that the span of the fulcrum of the moving mold plate in existing mold-locking mechanisms is relatively large. When using this type of mold-locking mechanism to clamp the mold, the span is still relatively large when the clamping force is transmitted to the mold mounting surface. The central support rigidity of the mold is insufficient, which easily leads to the attenuation of the force in the middle of the mold, resulting in poor force distribution and molding accuracy of the mold clamping system. During machine production, the central position of the mold is prone to arching, and the center of the injection molded product is prone to flash. Utility Model Content

[0004] One objective of this invention is to propose a clamping mechanism that counteracts mold deformation through bidirectional force application, resulting in a more uniform clamping force distribution and achieving a bidirectional center-pressure effect. Under the same clamping force, the actual force in the central area is higher. This surpasses the center-pressure effect of a direct-press mold and effectively improves the problem of insufficient clamping force in local mold locations, reducing the risk of local mold arching and minimizing flash in injection molded products.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: One aspect of this utility model provides a mold-locking mechanism, comprising: a movable mold plate, the movable mold plate including a first base and a first end plate, the first base being capable of being driven by a movable mold plate driving device, one side surface of the first end plate corresponding to the first base, and a boss being provided on the side surface of the first end plate, the first base being provided with at least one first support rib and at least one second support rib, the first support rib and the second support rib both extending from the first base to the boss and both being connected to the boss, the first support rib and the second support rib being arranged at relatively inclined intervals, such that the distance between the first support rib and the second support rib gradually decreases along the direction from the first base to the first end plate; a fixed mold plate and multiple tie rods, the fixed mold plate being fixed to one end of the multiple tie rods, the fixed mold plate being located on the side of the first end plate facing away from the first base, and the movable mold plate being capable of moving relative to the fixed mold plate along the length direction of the tie rods to approach or move away from the fixed mold plate.

[0006] According to some technical solutions of this application, the connection positions of the first support rib and the second support rib to the boss are both located on the top surface of the boss. The first support rib and the second support rib are both inclined relative to the top surface of the boss, and the first support rib and the second support rib are arranged in a V-shape with the center line of the top surface of the boss as the axis of symmetry.

[0007] According to some technical solutions of this application, the first end plate is provided with a first through hole that penetrates the first end plate and the boss along the thickness direction of the first end plate. The connection positions of the first support rib and the second support rib to the boss are respectively arranged on opposite sides of the first through hole, and the central axis of the first through hole coincides with the symmetry axis of the V-shape.

[0008] According to some technical solutions of this application, the top surface of the boss is also provided with a plurality of connecting posts, and the plurality of connecting posts are located on the periphery of the first through hole.

[0009] According to some technical solutions of this application, the template includes a second base and a second end plate. The second end plate is correspondingly arranged with the first end plate. The second base is arranged on the side of the second end plate opposite to the first end plate. The second base is fixedly connected to the tie rod. A support part is provided on the second base. The support part extends from the second base to the middle position of the second end plate.

[0010] According to some technical solutions of this application, at least a portion of the support portion near the second end plate and the boss are positioned correspondingly along the movement direction of the moving template.

[0011] According to some technical solutions of this application, the support includes a support base protruding from the surface of the second base and a plurality of connecting ribs. The support base extends from the middle position of the surface of the second base to the middle position of the surface of the second end plate. The plurality of connecting ribs are respectively connected to the side surface of the support base and are arranged outwardly with the support base as the center. The second base is provided with a plurality of connecting holes to connect a plurality of tie rods. The plurality of connecting holes are located on the inner side of the edge of the second base. The connecting ribs extend at least between the support base and the connecting holes.

[0012] According to some technical solutions of this application, the included angle between two circumferentially adjacent connecting ribs is V-shaped.

[0013] According to some technical solutions of this application, the end of each connecting rib away from the supporting base extends to the edge of the second base, and the connecting hole is provided corresponding to the connecting rib and penetrates the connecting rib.

[0014] According to some technical solutions of this application, the end face of the connecting rib facing away from the second base is set as an inclined surface, and the inclined surface is inclined towards the side closer to the center line of the second end plate along the direction from the second base toward the second end plate.

[0015] According to some technical solutions of this application, the second base is further provided with a plurality of support ribs, each of the support ribs extending toward the second end plate and connected to the second end plate, the plurality of support ribs being circumferentially spaced on the outer periphery of the support base, and the support ribs being located at the interval between two adjacent circumferential connecting ribs.

[0016] According to some technical solutions of this application, taking a vertical plane of the fixed template as a reference plane, the projections of the first support rib and the second support rib in the reference plane form a first relative tilt angle, and the projections of the opposite two side edges of the support portion in the reference plane form a second relative tilt angle, wherein the second relative tilt angle is greater than or equal to the first relative tilt angle.

[0017] Another aspect of this utility model provides an injection molding machine that includes the mold clamping mechanism described in any of the above-mentioned technical solutions.

[0018] The mold-locking mechanism of this application can clamp the mold between the fixed and moving mold plates by moving the moving mold plate along the length of the tie rod towards the fixed mold plate, thereby locking the mold. The moving mold plate includes a first base and a first end plate. A boss is provided on one side surface of the first end plate. First and second support ribs are spaced apart between the first base and the boss. When driving force is input to the moving mold plate through the first base and further transmitted to the first end plate along the first and second support ribs, the distance between the first and second support ribs gradually decreases along the direction from the first base to the first end plate. Consequently, the fulcrum of the driving force on the first end plate gradually moves closer to the center of the first end plate, reducing the span of the fulcrum of the driving force on the first end plate. This reduces the span of the fulcrum of the mold-locking force, improving the uniformity of the mold-locking force distribution, and ensuring the support rigidity requirements of both the mold edge and the mold center. Furthermore, since bosses are provided between the first and second support ribs and the first end plate, on the one hand, the bosses can improve the bending and torsional strength of the corresponding boss parts of the first end plate, thereby more reliably limiting the arching of the mold center. On the other hand, the first and second support ribs support the first end plate through the bosses, where the bosses can act as a fulcrum, thereby expanding the support area of ​​the first and second support ribs on the first end plate. This allows the driving force output by the first and second support ribs to be evenly distributed from point to surface by the bosses before being transmitted to the first end plate and the mold, thereby further improving the uniformity of the clamping force. Moreover, by expanding the support area through the bosses, the fulcrum position of the first end plate can be further promoted to move closer to the center of the first end plate, thereby improving the supplementary effect on the support rigidity of the mold center. This achieves the goal of meeting the clamping force requirements of the mold with a relatively small driving force, while also taking into account the uniformity of the clamping force distribution. This avoids the problem of insufficient clamping force in local areas such as the edge or center of the mold, reduces the risk of local arching of the mold, and reduces the flash problem of injection molded products.

[0019] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit the present invention. Attached Figure Description

[0020] The above and other objectives, features and advantages of the present invention will become more apparent from a detailed description of exemplary embodiments thereof with reference to the accompanying drawings.

[0021] Figure 1 This is a side view of the locking mechanism in one embodiment of this application.

[0022] Figure 2 This is a side view of the dynamic template in one embodiment of this application.

[0023] Figure 3This is a three-dimensional structural diagram of the moving template in one embodiment of this application.

[0024] Figure 4 This is a three-dimensional structural diagram of a template in one embodiment of this application.

[0025] Figure 5 This is a schematic diagram of another three-dimensional structure of the template in one embodiment of this application.

[0026] Figure 6 This is a three-dimensional structural schematic diagram of the locking mechanism in one embodiment of this application.

[0027] The attached figures are labeled as follows: 10. Moving template; 11. First base; 111. First support rib; 112. Second support rib; 113. Hinge support; 114. Clearance hole; 12. First end plate; 121. Boss; 1211. Top surface; 13. First through hole; 14. Connecting column; 20. Fixed template; 21. Second base; 211. Connecting hole; 22. Second end plate; 23. Support base; 24. Connecting rib; 241. Inclined surface; 25. Support rib; 26. Second through hole; 30. Tie rod; 40. Tail plate; 511. Moving template driving device; 512. Transmission mechanism; 52. Demolding driving device; A. First relative tilt angle; B. Second relative tilt angle. Detailed Implementation

[0028] Although the present invention can be readily embodied in various forms of implementation, only some specific embodiments are shown in the accompanying drawings and will be described in detail in this specification. It is also understood that this specification should be regarded as an exemplary description of the principles of the present invention and is not intended to limit the present invention to what is described herein.

[0029] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0030] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, back, etc.) used to explain the structure and movement of the various elements of this invention are relative rather than absolute. These descriptions are appropriate when these elements are in the positions shown in the drawings. If the descriptions of the positions of these elements change, these directional indications also change accordingly.

[0031] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided to make the description of the present invention more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art. The drawings are merely illustrative of the present invention and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0032] In some injection molding machines, the clamping mechanism uses a plate or shell structure for the moving platen. The moving platen drive is connected to the opposite ends of the moving platen in the vertical direction. When the mold is clamped using the clamping mechanism, the driving force provided by the moving platen drive is transmitted to the mold along the wall thickness direction of the moving platen, with the position where the drive is connected to the moving platen as the fulcrum. This causes the moving platen to press the mold against the fixed platen under the action of the driving force. In the aforementioned clamping mechanism, the fulcrum of the driving force on the moving platen is the opposite ends of the moving platen in the vertical direction. As a result, the span of the fulcrum on the moving platen is approximately the distance between the two ends of the moving platen in the vertical direction, i.e., the vertical height of the moving platen. The span of the fulcrum of the moving platen in this structure is relatively large. Correspondingly, the span is still relatively large when the clamping force is transmitted to the mold mounting surface. The support rigidity of the mold center is insufficient, which easily leads to the attenuation of the force in the middle of the mold. The force distribution and molding accuracy of the clamping system are not good. During machine production, the center of the mold is prone to arching, and flash is likely to occur in the center of the injection molded product.

[0033] Please see Figure 1 , Figure 1 The side view of the mold-locking mechanism in one embodiment of this application is shown.

[0034] like Figure 1 As shown, the mold-locking mechanism provided in this embodiment includes a moving mold plate 10, a fixed mold plate 20, and multiple tie rods 30.

[0035] The movable template 10 includes a first base 11 and a first end plate 12. The first base 11 can be used to drive the movable template driving device 511. One side surface of the first end plate 12 is correspondingly provided with the first base 11, and a boss 121 is provided on the first end plate 12 corresponding to the side surface of the first base 11. At least one first support rib 111 and at least one second support rib 112 are provided on the first base 11. The first support rib 111 and the second support rib 112 both extend from the first base 11 to the boss 121 and are both connected to the boss 121. The first support rib 111 and the second support rib 112 are arranged at intervals with relative inclination, so that the distance W between the first support rib 111 and the second support rib 112 gradually decreases along the direction from the first base 11 to the first end plate 12. The fixed template 20 is fixed to one end of multiple tie rods 30, and the fixed template 20 is located on the side of the first end plate 12 facing away from the first base 11. The movable template 10 can move relative to the fixed template 20 along the length direction of the tie rods 30 to approach or move away from the fixed template 20.

[0036] The mold locking mechanism of this application can lock the mold by having the movable template 10 move closer to the fixed template 20 along the length of the tie rod 30, thereby clamping the mold between the fixed template 20 and the movable template 10. The moving template 10 includes a first base 11 and a first end plate 12. A boss 121 is provided on one side surface of the first end plate 12. A first support rib 111 and a second support rib 112 are provided between the first base 11 and the boss 121. When the driving force is input into the moving template 10 through the first base 11 and further transmitted to the first end plate 12 along the first support rib 111 and the second support rib 112, the distance between the first support rib 111 and the second support rib 112 gradually decreases along the direction from the first base 11 to the first end plate 12. Consequently, the fulcrum position of the driving force on the first end plate 12 gradually moves closer to the center of the first end plate 12, thereby reducing the fulcrum span of the driving force on the first end plate 12. This reduces the fulcrum span of the clamping force, improves the uniformity of the clamping force distribution, and ensures the support rigidity requirements of the mold edge and the mold center. Furthermore, since a boss 121 is provided between the first support rib 111 and the second support rib 112 and the first end plate 12, on the one hand, the boss 121 can improve the bending and torsional strength of the part of the first end plate 12 corresponding to the boss 121, thereby more reliably limiting the arching of the center part of the mold. On the other hand, the first support rib 111 and the second support rib 112 support the first end plate 12 through the boss 121, wherein the boss 121 can act as a fulcrum, thereby expanding the support area of ​​the first support rib 111 and the second support rib 112 on the first end plate 12, so that the first support rib 111 and the second support rib 112 can effectively support the first end plate 12. The driving force is evenly distributed from point to surface by the boss 121 and then transmitted to the first end plate 12 and the mold, thereby further improving the uniformity of the clamping force. Furthermore, by expanding the support area through the boss 121, the fulcrum position of the first end plate 12 can be further promoted to move closer to the center of the first end plate 12, thereby improving the supplementary effect on the support rigidity of the mold center. This achieves the goal of meeting the clamping force requirements of the mold with a relatively small driving force, while also taking into account the uniformity of the clamping force distribution. It avoids the problem of insufficient clamping force in local areas such as the edge or center of the mold, reduces the risk of local mold arching, and reduces the flash problem of injection molded products.

[0037] Please see Figure 2 , Figure 2 The side view of the dynamic template 10 in one embodiment of this application is shown.

[0038] like Figure 2As shown, at least a portion of the boss 121 is located at the middle of the side surface of the first end plate 12. In this way, the driving force transmitted from the first support rib 111 and the second support rib 112 to the first end plate 12 through the boss 121 can be directly transmitted to the middle of the first end plate 12, thereby directly supporting the center part of the mold. In this way, the need to supplement the support rigidity of the center part of the mold can be met with a smaller driving force, and the problem of insufficient support rigidity of the center part can be better avoided.

[0039] like Figure 2 As shown, the boss 121 is integrally formed on the first end plate 12 and protrudes from the surface of the first end plate 12. In this way, the first end plate 12 has the effect of increasing the wall thickness at the corresponding position by setting the boss 121, which can enhance the bending and torsional strength of the first end plate 12 at the corresponding position, limit the arching of the part of the mold corresponding to the boss 121, and at the same time act as a fulcrum to increase the support area of ​​the first support rib 111 and the second support rib 112 on the first end plate 12, and further improve the uniformity of the clamping force distribution.

[0040] Of course, in other embodiments, the boss 121 and the first end plate 12 can also be two independent components. For example, the boss 121 is a plate body independent of the first end plate 12, and the boss 121 is connected and fixed to the first end plate 12 by screws or other connectors or welded to the first end plate 12.

[0041] like Figure 2 As shown, the side of the connection between the boss 121 and the first end plate 12 is set in a concave arc shape. This can reduce the shear stress of the edge of the boss 121 on the first end plate 12, so that the driving force can be transmitted to the first end plate 12 more evenly through the boss 121, thereby improving the uniformity of the clamping force and extending the service life of the first end plate 12.

[0042] Optionally, a through hole or groove is provided on the moving template 10 at the position corresponding to the tie rod 30, and the tie rod 30 passes through the corresponding through hole or groove so as to avoid interference between the tie rod 30 and the moving template 10.

[0043] like Figure 2 As shown, through holes or grooves for avoiding the tie rod 30 are distributed on the outer periphery of the boss 121 on the first end plate 12.

[0044] like Figure 2As shown, the first support rib 111 and the second support rib 112 are symmetrically arranged. Thus, when the driving force Fxy transmitted along the first support rib 111 is transmitted to the boss 121, due to the inclined arrangement of the first support rib 111, Fxy can be decomposed into a component force Fx perpendicular to the direction of the first end plate 12 and a component force Fy parallel to the direction of the first end plate 12. Correspondingly, when the driving force transmitted along the second support rib 112 is transmitted to the boss 121, due to the inclined arrangement of the second support rib 112, it can also be decomposed into a component force perpendicular to the direction of the first end plate 12 and a component force parallel to the direction of the first end plate 12. By symmetrically arranging the shapes of the first support rib 111 and the second support rib 112, the component force Fy corresponding to the first support rib 111 and the component force parallel to the direction of the first end plate 12 corresponding to the second support rib 112 can cancel each other out, reducing the risk of deformation of the boss 121 and the first end plate 12.

[0045] like Figure 2 As shown, the connection points of the first support rib 111 and the second support rib 112 with the boss 121 are both located on the top surface 1211 of the boss 121. In this way, the driving force transmitted by the first support rib 111 and the second support rib 112 can be transmitted to the first end plate 12 more evenly through the boss 121, thereby improving the uniformity of the clamping force. Furthermore, the shearing action formed by the driving force transmitted by the first support rib 111 and the second support rib 112 is mainly borne by the boss 121, which can reduce the risk of deformation and damage to the first end plate 12.

[0046] like Figure 2 As shown, both the first support rib 111 and the second support rib 112 are inclined relative to the top surface 1211 of the boss 121. In this way, the first support rib 111 and the second support rib 112 are arranged in a roughly V-shape on the top surface 1211 of the boss 121, which can more efficiently transmit the clamping force with a large span to the center position of the first end plate 12, and better avoid the problem of insufficient support rigidity in the center of the mold.

[0047] like Figure 2 As shown, the first support rib 111 and the second support rib 112 are arranged in a V-shape with the center line of the top surface of the boss 121 as the axis of symmetry.

[0048] It is understandable that the so-called center line of the top surface of the boss 121 can also be understood as the perpendicular line of the top surface of the boss 121.

[0049] Through this structure, the clamping force transmitted by the first support rib 111 and the second support rib 112 can be transmitted to the center of the mold more efficiently, so that under the same clamping force, the moving platen 10 exerts a higher actual force on the center area of ​​the mold.

[0050] Please see Figure 3 , Figure 3The three-dimensional structure of the moving template 10 in one embodiment of this application is shown.

[0051] like Figure 3 As shown, the first end plate 12 is provided with a first through hole 13 that extends through the first end plate 12 and the boss 121 along the thickness direction of the first end plate 12. The first through hole 13 can be used for the movable rod of the demolding drive device 52 to pass through. The connection positions of the first support rib 111 and the second support rib 112 with the boss 121 are located on opposite sides of the first through hole 13, and the central axis of the first through hole 13 coincides with the axis of symmetry of the V-shaped first support rib 111 and the second support rib 112.

[0052] like Figure 3 As shown, the top surface 1211 of the boss 121 is also provided with a plurality of connecting posts 14, which are located on the periphery of the first through hole 13. The connecting posts 14 can be used to connect with and support the demolding drive device 52, so as to realize the demolding drive device 52 being mounted on the boss 121 and to avoid interference between the demolding drive device 52 and the first support rib 111 and the second support rib 112 with gradually decreasing spacing.

[0053] More specifically, the first base 11 can be configured as follows: Figure 3 The rectangular frame shown is hollow inside, and the hollow portion of the frame serves as a clearance hole 114, which can be used to accommodate and accommodate the demolding drive device 52. The demolding drive device 52 can be connected to the connecting column 14 and passes through the clearance hole 114 and between the first support rib 111 and the second support rib 112, achieving a compact layout of the demolding drive device 52 inside the moving template 10. Simultaneously, because the demolding drive device 52 is supported by the connecting column 14, it will not interfere with the gradually decreasing spacing of the first and second support ribs 111 and 112. Therefore, it is not necessary to increase the spacing between the first and second support ribs 111 and 112 to meet the installation and accommodation requirements of the moving template 10 for the demolding drive device 52. This allows the demolding drive device 52 to be installed and accommodated inside the moving template 10 while also meeting the smaller span requirement of the moving template 10's support points.

[0054] like Figure 3 As shown, there is one first support rib 111 and one second support rib 112, and both the first support rib 111 and the second support rib 112 have a certain width. This can improve the strength of the first support rib 111 and the second support rib 112 themselves, so as to meet the load-bearing requirements of the first support rib 111 and the second support rib 112 for the driving force.

[0055] To reduce the weight of the moving template 10, a weight-reducing groove is provided on at least one of the first support rib 111 and the second support rib 112, specifically as follows: Figure 3As shown, three weight-reducing grooves are provided on the first support rib 111, all extending along the length of the first support rib 111 and arranged parallel to each other. Three weight-reducing grooves are also provided on the second support rib 112, extending along the length of the second support rib 112 and arranged parallel to each other. The three weight-reducing grooves of the first support rib 111 correspond to the three weight-reducing grooves of the second support rib 112. Of course, in other embodiments, multiple first support ribs 111 and multiple second support ribs 112 can be provided, with multiple first support ribs 111 arranged at intervals and multiple second support ribs 112 arranged at intervals, to simultaneously meet both load-bearing and weight-reduction requirements.

[0056] like Figure 3 As shown, the moving template 10 is an integrally formed component, which can better ensure the strength of the moving template 10 as well as the strength and relative positional accuracy of the first support rib 111 and the second support rib 112.

[0057] like Figure 3 As shown, the first base 11 is provided with one or more connecting portions away from the first support rib 111 and the second support rib 112. These connecting portions are used for transmission connection to the moving template drive device 511. In this structure, after the driving force from the moving template drive device 511 is input to the connecting portion, the connecting portion transmits the driving force to the first support rib 111 and the second support rib 112 through the first base 11. By using the first base 11 to transmit the driving force between the connecting portion and the first support rib 111 and the second support rib 112, the distribution of the driving force between the first support rib 111 and the second support rib 112 can be more uniform, thereby improving the uniformity of the clamping force.

[0058] Please see Figure 4 , Figure 4 The three-dimensional structure of the template 20 in one embodiment of this application is shown.

[0059] Please see Figure 5 , Figure 5 The three-dimensional structure of the template 20 in one embodiment of this application is shown from another perspective.

[0060] like Figure 4 and Figure 5 As shown, the template 20 includes a second base 21 and a second end plate 22. The second end plate 22 is correspondingly arranged with the first end plate 12. The second base 21 is arranged on the side of the second end plate 22 that is away from the first end plate 12. The second base 21 is fixedly connected to the tie rod 30. A support part is provided on the second base 21, and the support part extends from the second base 21 to the middle position of the second end plate 22.

[0061] By extending the support portion from the second base 21 to the middle position of the second end plate 22, during the process of the moving template 10 and the fixed template 20 pressing the mold, the support portion directly supports the middle position of the second end plate 22, which can reduce the span of the fulcrum on the fixed template 20, making the clamping force of the fixed template 20 pressing the mold more uniform. In addition, the support portion can also limit the middle part of the mold from arching towards the fixed template 20, avoiding flash in the middle part of the injection molded product.

[0062] Furthermore, by configuring structures on both the moving template 10 and the fixed template 20 that can transmit the clamping force to the center of the mold, namely the first support rib 111, the second support rib 112, and the boss 121 configured on the moving template 10, and the support portion extending from the second base 21 to the middle of the second end plate 22 configured on the fixed template 20, the effect of bidirectional central clamping of the mold can be achieved. That is, when the moving template 10 and the fixed template 20 clamp the mold, the moving template 10 and the fixed template 20 can provide support rigidity to the center of the mold from opposite sides, thereby more reliably solving the problem of the center of the mold arching.

[0063] At least a portion of both the end of the support near the second end plate 22 and the boss 121 are positioned correspondingly along the direction of movement of the moving template 10. Please continue reading. Figure 1 , Figure 1 The H region can be roughly understood as the area where the boss 121 is projected onto the second end plate 22 along the movement direction of the moving template 10. Figure 1 As can be seen, at least a portion of the support portion near the second end plate 22 falls into the H region. That is, the area of ​​the boss 121 projected onto the second end plate 22 along the movement direction of the moving template 10 overlaps with at least a portion of the support portion near the second end plate 22. In this way, a portion of the clamping force provided by the moving template 10 to the center of the mold and a portion of the clamping force provided by the fixed template 20 to the center of the mold are positionally corresponding but opposite in direction. This can further enhance the clamping effect on the center of the mold, thereby further reducing the risk of the center of the mold arching. Moreover, the clamping forces that are positionally corresponding but opposite in direction can cancel each other out, thereby reducing the shear stress on the mold, the first end plate 12, and the second end plate 22, and extending the life of the mold, the first end plate 12, and the second end plate 22.

[0064] Optionally, such as Figure 1As shown, the end of the support near the second end plate 22 and the boss 121 are completely aligned. This improves the offsetting effect between the clamping force provided by the moving template 10 to the center of the mold and the clamping force provided by the fixed template 20 to the center of the mold. This further enhances the locking effect on the center of the mold and reduces the shear stress on the mold, the first end plate 12 and the second end plate 22, thereby further extending the life of the mold, the first end plate 12 and the second end plate 22.

[0065] Please continue reading. Figure 4 and Figure 5 The support includes a support base 23 protruding from the surface of the second base 21 and a plurality of connecting ribs 24. The support base 23 extends from the middle position of the surface of the second base 21 to the middle position of the surface of the second end plate 22. The plurality of connecting ribs 24 are respectively connected to the side surface of the support base 23 and are arranged outwardly with the support base 23 as the center.

[0066] During the transmission of the supporting force of the tie rod 30 from the second base 21 to the second end plate 22, a portion of the supporting force on the second base 21 is directly transmitted to the second end plate 22 along the supporting base 23, while another portion of the supporting force converges at the supporting base 23 along multiple connecting ribs 24 and is further transmitted to the second end plate 22 along the supporting base 23. Thus, the larger clamping force on the second base 21 is transmitted to the center of the second end plate 22 through the supporting base 23 and multiple connecting ribs 24. The span of the second end plate 22 relative to the mold is reduced, thereby improving the uniformity of the clamping force distribution on the fixed mold plate 20.

[0067] Please continue reading. Figure 4 and Figure 5 The second base 21 is provided with a plurality of connecting holes 211 to connect a plurality of tie rods 30. The plurality of connecting holes 211 are located on the inner side of the edge of the second base 21, and the connecting ribs 24 extend at least between the supporting base 23 and the connecting holes 211.

[0068] In this way, the connection between the tie rod 30 and the connecting hole 211 forms the fulcrum of the tie rod 30's supporting force on the second base 21. Correspondingly, when this supporting force is transmitted to the second base 21, it can be further transmitted along the connecting ribs 24 to the supporting base 23. Thus, the supporting force transmitted by multiple connecting ribs 24 converges through the supporting base 23 and is transmitted along the supporting base 23 to the center of the second end plate 22. This achieves the transmission of the large-span clamping force provided by the tie rod 30 to the second base 21 to the center of the second end plate 22, making the cancellation between the clamping force provided by the moving template 10 to the center of the mold and the clamping force provided by the fixed template 20 to the center of the mold better. In this way, the locking effect on the center of the mold is further improved, and the shear stress on the mold, the first end plate 12 and the second end plate 22 is further reduced, thereby further extending the service life of the mold, the first end plate 12 and the second end plate 22.

[0069] Please continue reading. Figure 1 The included angle between two circumferentially adjacent connecting ribs 24 is V-shaped. In this way, the clamping force transmitted by the two circumferentially adjacent connecting ribs 24 can be transmitted to the center of the mold more efficiently, so that under the same clamping force, the fixed platen 20 exerts a higher actual force on the central area of ​​the mold.

[0070] like Figure 4 and Figure 5 As shown, the end of each connecting rib 24 away from the supporting base 23 extends to the edge of the second base 21, and the connecting hole 211 is provided corresponding to the connecting rib 24 and passes through the connecting rib 24. In this way, by extending the connecting rib 24 to the edge of the second base 21 and making the connecting hole 211 on the second base 21 correspond to the midpoint of the length direction of the connecting rib 24, the wall thickness of the second base 21 at the location of the connecting hole 211 is increased due to the setting of the connecting rib 24. The bending and torsional strength of the second base 21 near the tie rod 30 is higher, and the second base 21 is less likely to deform due to excessive support force from the tie rod 30. The connecting rib 24 can transfer the large-span clamping force on the fixed template 20 to the support base 23 corresponding to the middle position of the second end plate 22. This makes the clamping force provided by the second end plate 22 to the mold closer to the center of the mold compared to the structure of directly pressing the mold along the wall thickness direction of the fixed template. This further improves the locking effect on the center of the mold and further reduces the shear stress on the mold, the first end plate 12, and the second end plate 22, thereby further extending the life of the mold, the first end plate 12, and the second end plate 22.

[0071] like Figure 4 and Figure 5As shown, the end face of the connecting rib 24 and one end of the second base 21 is set as an inclined surface 241. The inclined surface 241 is inclined towards the side closer to the center line of the second end plate 22 along the direction from the second base 21 toward the second end plate 22. In this way, during the process of transmitting the supporting force from the connecting hole 211 along the connecting rib 24 to the supporting base, the inclined surfaces 241 of two adjacent circumferential connecting ribs 24 are arranged in a roughly V-shape with the supporting base 23 as the vertex. This can more efficiently transmit the clamping force with a relatively large span to the center position of the second end plate 22, and better avoid the problem of insufficient support rigidity in the center of the mold.

[0072] like Figure 4 and Figure 5 As shown, the second base 21 is also provided with a plurality of support ribs 25, each support rib 25 extending toward and connecting to the second end plate 22. The plurality of support ribs 25 are distributed circumferentially at intervals on the outer periphery of the support base 23, and the support ribs 25 are located at the intervals between two adjacent circumferential connecting ribs 24. This ensures that the fixed mold provides more sufficient support force and support stability to the edge parts of the mold, thereby better taking into account the clamping force requirements at the edge of the mold.

[0073] like Figure 5 As shown, the fixed template 20 is provided with a second through hole 26 that penetrates the second base 21, the support base 23 and the second end plate 22. The second through hole 26 can be used for the discharge pipe of the injection device of the injection molding machine to pass through, so as to realize the automatic injection of glue into the mold by the injection device.

[0074] like Figure 4 and Figure 5 As shown, the fixed template 20 is an integrally formed component, which can better ensure the strength of the fixed template 20 as well as the strength and relative positional accuracy of the supporting base 23, connecting ribs 24, and second end plate 22.

[0075] Please continue reading. Figure 1 A vertical plane of the template 20 is used as a reference plane (this reference plane can be specifically understood as...). Figure 1 The projections of the first support rib 111 and the second support rib 112 onto the reference plane form a first relative tilt angle A, and the projections of the opposite side edges of the support portion onto the reference plane form a second relative tilt angle B. The second relative tilt angle B is greater than or equal to the first relative tilt angle A. The relatively large second relative tilt angle B allows for better stability of the fixed template 20 supporting the mold, while the smaller first relative tilt angle A allows for better installation and accommodation of the moving template 10 for the demolding drive device 52.

[0076] Please see Figure 6 , Figure 6 The three-dimensional structure of the mold-locking mechanism in one embodiment of this application is shown.

[0077] like Figure 6 As shown, the mold-locking mechanism may further include a tail plate 40, a moving mold plate drive device 511, a transmission mechanism 512, and a demolding drive device 52. The tail plate 40 is located on the side of the moving mold plate 10 away from the fixed mold plate 20, and is fixedly connected to the end of the pull rod 30 away from the fixed mold plate 20. The moving mold plate drive device 511 is mounted on the tail plate 40, and its output end is connected to the input end of a transmission mechanism 512. The output end of the transmission mechanism 512 is connected to the connecting portion of the first base 11.

[0078] like Figure 6 As shown, the transmission mechanism 512 can be a linkage mechanism, the output end of which is a hinge structure, and the connecting part of the first base 11 is a hinge support 113, which is hinged to the hinge support 113. Under the drive of the moving template driving device 511, the linkage mechanism drives the moving template 10 to slide back and forth along the length direction of the pull rod 30 by folding or unfolding the transmission rods of the linkage mechanism itself.

[0079] The moving template drive device 511 can be a hydraulic cylinder, a pneumatic cylinder, etc.

[0080] like Figure 6 As shown, the demolding drive device 52 is connected to and supported by the connecting column 14 on the boss 121. The demolding drive device 52 is provided with a movable rod, which passes through the first through hole 13 on the boss 121 and the first end plate 12 to push open the mold and realize automatic demolding.

[0081] The demolding drive device 52 can be a hydraulic cylinder, a pneumatic cylinder, etc.

[0082] In this embodiment, the clamping force on the tail plate 40 is transmitted to the first base 11 of the moving platen 10 via a linkage mechanism. The first base 11 of the moving platen 10 and the first end plate 12 are connected by a first support rib 111 and a second support rib 112 arranged in a roughly V-shape. This allows the clamping force with a larger span to be transmitted from the first base 11 to the mold mounting surface closer to the center of the first end plate 12. The clamping force with a larger span on the second base 21 of the fixed platen 20 (i.e., the aforementioned support force) can be transmitted to the mold mounting surface closer to the center of the second end plate 22 via the support base 23 and adjacent connecting ribs 24 arranged in a roughly V-shape. Thus, by applying force in both directions to counteract platen deformation, the clamping force distribution is more uniform, achieving a bidirectional central pressing effect. Under the same clamping force, the actual force in the central area is higher. This achieves a central pressing effect exceeding that of a direct press and can effectively improve the problem of insufficient clamping force in local mold locations, reduce the risk of local mold arching, and reduce flash problems in injection molded products.

[0083] Another aspect of the present invention provides an injection molding machine, including the mold clamping mechanism in any of the above embodiments.

[0084] Optionally, the injection molding machine may also include an injection device (not shown in the figure), which is located on the side of the fixed platen 20 opposite to the moving platen 10. The discharge tube of the injection device can pass through the second through hole 26 on the fixed platen 20 to inject adhesive into the mold.

[0085] Although the present invention has been described with reference to several typical embodiments, it should be understood that the terminology used is descriptive and exemplary, and not restrictive. Since the present invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A mold-locking mechanism, characterized in that, include: The movable template includes a first base and a first end plate. The first base can be used to drive the movable template driving device. One side surface of the first end plate is correspondingly disposed with the first base, and a boss is disposed on the side surface of the first end plate. At least one first support rib and at least one second support rib are disposed on the first base. The first support rib and the second support rib both extend from the first base to the boss and are both connected to the boss. The first support rib and the second support rib are arranged at intervals with relative inclination, such that the distance between the first support rib and the second support rib gradually decreases along the direction from the first base to the first end plate. The movable template consists of a fixed template and multiple tie rods. The fixed template is fixed to one end of the multiple tie rods. The fixed template is located on the side of the first end plate opposite to the first base. The movable template can move relative to the fixed template along the length direction of the tie rods to move closer to or away from the fixed template.

2. The mold-locking mechanism according to claim 1, characterized in that, The connection points of the first support rib and the second support rib to the boss are both located on the top surface of the boss. The first support rib and the second support rib are both inclined relative to the top surface of the boss, and the first support rib and the second support rib are arranged in a V-shape with the center line of the top surface of the boss as the axis of symmetry.

3. The mold-locking mechanism according to claim 2, characterized in that, The first end plate is provided with a first through hole that penetrates the first end plate and the boss along the thickness direction of the first end plate. The connection positions of the first support rib and the second support rib to the boss are respectively arranged on opposite sides of the first through hole, and the central axis of the first through hole coincides with the symmetry axis of the V-shape.

4. The mold-locking mechanism according to claim 3, characterized in that, The top surface of the boss is also provided with a plurality of connecting posts, which are located on the periphery of the first through hole.

5. The mold-locking mechanism according to any one of claims 1 to 4, characterized in that, The template includes a second base and a second end plate. The second end plate is correspondingly arranged with the first end plate. The second base is arranged on the side of the second end plate opposite to the first end plate. The second base is fixedly connected to the tie rod. A support part is provided on the second base, and the support part extends from the second base to the middle position of the second end plate.

6. The mold-locking mechanism according to claim 5, characterized in that, At least a portion of the support portion near the second end plate and the boss are positioned correspondingly along the movement direction of the moving template.

7. The mold-locking mechanism according to claim 5, characterized in that, The support includes a support base protruding from the surface of the second base and a plurality of connecting ribs. The support base extends from the middle position of the surface of the second base to the middle position of the surface of the second end plate. The plurality of connecting ribs are respectively connected to the side surface of the support base and are arranged outwardly with the support base as the center. The second base is provided with a plurality of connecting holes for corresponding connection of a plurality of the tie rods. The plurality of connecting holes are provided on the inner side of the edge of the second base, and the connecting rib extends at least between the supporting base and the connecting holes.

8. The mold-locking mechanism according to claim 7, characterized in that, The included angle between two adjacent connecting ribs in the circumferential direction is V-shaped.

9. The mold-locking mechanism according to claim 7, characterized in that, Each of the connecting ribs extends to the edge of the second base at one end away from the supporting base, and the connecting hole is provided corresponding to the connecting rib and penetrates the connecting rib.

10. The mold-locking mechanism according to claim 7, characterized in that, The end face of the connecting rib facing away from the second base is set as an inclined surface, and the inclined surface is inclined towards the side closer to the center line of the second end plate along the direction from the second base toward the second end plate.

11. The mold-locking mechanism according to claim 7, characterized in that, The second base is also provided with a plurality of support ribs, each of which extends toward the second end plate and is connected to the second end plate. The plurality of support ribs are circumferentially spaced on the outer periphery of the support base, and the support ribs are located at the interval between two adjacent circumferential connecting ribs.

12. The mold-locking mechanism according to claim 5, characterized in that, Using a vertical plane of the fixed template as a reference plane, the projections of the first support rib and the second support rib on the reference plane form a first relative tilt angle, and the projections of the opposite two side edges of the support portion on the reference plane form a second relative tilt angle, wherein the second relative tilt angle is greater than or equal to the first relative tilt angle.

13. An injection molding machine, characterized in that, Includes the mold-locking mechanism as described in any one of claims 1 to 12.

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