Anti-deformation plastic mold support frame

Abstract

The utility model discloses a kind of anti-deformation plastic mould support frame, wherein, anti-deformation plastic mould support frame, including upper die plate, lower die plate and the guiding structure of connecting both, the guiding structure includes guide pillar fixed in upper die plate and guiding sleeve set in lower die plate, elastic buffer assembly is equipped between guiding sleeve inner wall and guide pillar, the elastic buffer assembly includes multiple wedge-shaped elastic units distributed symmetrically, each wedge-shaped elastic unit is attached with guide pillar surface, flexible piezoresistive film is attached with the inboard of the wedge-shaped elastic unit, the resistance value of the flexible piezoresistive film changes with the change of guide pillar one side pressure, guiding sleeve outer wall is annularly equipped with LED light belt, and with the flexible piezoresistive film electric connection, control module is also equipped in guiding sleeve, for the resistance change of flexible piezoresistive film to dynamically indicate corresponding guide pillar pressure state.The utility model technical scheme aims at realizing the real-time visual monitoring of guide pillar one side pressure state, solves the guide column eccentric load deformation problem caused by parallelism deviation.

Description

Technical Field

[0001] This utility model relates to the field of plastic mold technology, and in particular to a plastic mold support frame that prevents deformation. Background Technology

[0002] In the field of large-scale precision injection molds for automotive parts, mold closing accuracy is a core element in ensuring mold life and molding quality. During injection molding, the injection molding machine applies a huge clamping force through a hydraulic or electric system to tightly close the moving and fixed molds, preventing the molten plastic from opening the mold when injected under high pressure. However, during mold closing, deviations in the parallelism of the injection molding machine's mold plates often lead to unilateral stress on the base, causing tilting displacement. This asymmetrical stress causes the guide pillars to bear uneven lateral loads, resulting in problems such as guide pillar deformation and mold misalignment. When the mold is misaligned, the clamping force will be concentrated on one side of the mold (e.g., the right side bears 70% of the force, while the left side only bears 30%), causing the bending moment of the mold plate to exceed the design standard. In addition, when misaligned, the guide pillars may only contact one side, and the local contact pressure may exceed the yield strength of the material, further exacerbating the risk of deformation. Utility Model Content

[0003] The main purpose of this invention is to provide a deformation-resistant plastic mold support frame, which aims to achieve real-time visual monitoring of the unilateral pressure state of the guide post and solve the problem of eccentric deformation of the guide post caused by parallelism deviation.

[0004] To achieve the above objectives, the present invention proposes a deformation-resistant plastic mold support frame, comprising an upper template, a lower template, and a guide structure connecting the two. The guide structure includes a guide post fixed to the upper template and a guide sleeve disposed on the lower template. The feature is that an elastic buffer assembly is provided between the inner wall of the guide sleeve and the guide post. The elastic buffer assembly includes a plurality of symmetrically distributed wedge-shaped elastic units, each wedge-shaped elastic unit being in contact with the surface of the guide post.

[0005] A flexible piezoresistive film is attached to the inner side of the wedge-shaped elastic unit, and the resistance value of the flexible piezoresistive film changes with the pressure on one side of the guide post.

[0006] The outer wall of the guide sleeve is provided with an LED light strip, which is distributed around the guide post in a circumferential direction and is electrically connected to the flexible piezoresistive film.

[0007] The guide sleeve is also equipped with a control module, which is used to drive the LED light strip to gradually change the color of the light emission according to the resistance change of the flexible piezoresistive film, so as to dynamically indicate the pressure state of the corresponding guide post.

[0008] In one possible implementation, the outer wall of the guide sleeve is provided with a transparent observation window corresponding to the LED light strip, and the inner side of the transparent observation window is provided with a diffuser film for uniformly diffusing the LED light.

[0009] In one possible implementation, the guide post and the guide sleeve are fixed to the outer side walls of the upper template and the lower template respectively by a first connecting seat and a second connecting seat, and the first connecting seat and the second connecting seat are located on the outer side of the template closing end face.

[0010] In one possible implementation, the guide post includes an integrally formed guide portion and a fixing portion. The guide portion is a column with a square cross-section, and the fixing portion is cylindrical. The first connecting seat has a mounting hole that matches the fixing portion. The fixing portion is inserted into the mounting hole. The side wall of the first connecting seat has a radially penetrating locking pin hole. The fixing portion has an annular locking groove at the position corresponding to the locking pin hole. A locking pin is inserted into the locking pin hole, and the inner end of the locking pin is embedded in the annular locking groove to limit the axial displacement of the guide post.

[0011] In one possible implementation, the inner wall of the guide post mounting cylinder is provided with an axial groove, and the end of the guide post is provided with a guide key that cooperates with the axial groove. The guide post can be slidably inserted into or removed from the mounting cylinder along the axial groove.

[0012] This invention integrates a flexible piezoresistive film with an elastic buffer component between the guide post and the guide sleeve. Combined with a circumferential LED light strip and a control module, it converts the pressure on one side of the guide post into a resistance signal and drives a gradual color change alarm for the light. This achieves real-time visual monitoring of the pressure state on one side of the guide post, solving the problem of guide post deformation due to uneven loading caused by the parallelism deviation of the injection molding machine template. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0015] Figure 2 This is a cross-sectional view of the guide structure of this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the guide post of this utility model.

[0017] Explanation of icon numbers:

[0018] 1. Upper template; 2. Lower template; 3. Guide structure; 31. Guide post; 311. Guide part; 312. Fixing part; 313. Annular locking groove; 32. Guide sleeve; 4. Elastic buffer assembly; 41. Wedge-shaped elastic unit; 42. Flexible piezoresistive film; 5. LED light strip; 6. Transparent observation window; 71. First connecting seat; 711. Mounting hole; 712. Locking pin hole; 72. Second connecting seat; 81. Axial groove; 82. Guide key.

[0019] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] To address the problems in the background technology, this utility model proposes a deformation-resistant plastic mold support frame, including an upper template 1, a lower template 2, and a guide structure 3 connecting the two. The guide structure 3 includes a guide post 31 fixed to the upper template 1 and a guide sleeve 32 disposed on the lower template 2. The feature is that an elastic buffer assembly 4 is provided between the inner wall of the guide sleeve 32 and the guide post 31. The elastic buffer assembly 4 includes a plurality of symmetrically distributed wedge-shaped elastic units 41, and each wedge-shaped elastic unit 41 is in contact with the surface of the guide post 31.

[0022] A flexible piezoresistive film 42 is attached to the inner side of the wedge-shaped elastic unit 41. The resistance value of the flexible piezoresistive film 42 changes with the pressure on one side of the guide post 31.

[0023] The outer wall of the guide sleeve 32 is provided with an LED light strip 5, which is distributed around the guide post 31 in a circumferential manner and is electrically connected to the flexible piezoresistive film 42.

[0024] The guide sleeve 32 is also equipped with a control module, which is used to drive the LED light strip 5 to gradually change the color of its light emission according to the resistance change of the flexible piezoresistive film 42, so as to dynamically indicate the pressure state of the corresponding guide post 31.

[0025] Combined with reference Figure 1 and Figure 2As shown, in this embodiment, the plastic mold support frame includes an upper template 1, a lower template 2, and a guide structure 3 connecting the two. The guide structure 3 consists of guide posts 31 and guide sleeves 32. The guide sleeve 32 is fixed within the mounting hole 711 of the lower template 2, and an annular gap is provided between its inner wall and the guide post 31. Four wedge-shaped elastic units 41 are symmetrically installed circumferentially within this gap. The axial cross-section of each wedge-shaped elastic unit 41 is a right-angled trapezoid, and its inner inclined surface is an arc-shaped curved surface concentric with the cylindrical surface of the guide post 31. Its thickness decreases linearly from the root near the connecting seat to the free end, ensuring that the wedge-shaped unit is gradually compressed from the end to the root when the guide post 31 is compressed.

[0026] A flexible piezoresistive film 42 is attached to the inner arc surface of the wedge-shaped elastic unit 41 (the side in contact with the guide post 31), and its resistance changes when compressed. Multiple fan-shaped copper foil electrodes are printed on the pressure-bearing surface of the film, dividing the guide post 31 circumferentially into multiple independent detection zones. Each detection zone is connected to the control module via a wire. An annular groove is machined on the outer wall of the guide sleeve 32, and an LED light strip 5 is embedded within the groove. The light strip consists of multiple tri-color LED beads arranged equidistantly along the circumference, and a transparent polycarbonate observation window covers the outside of the light strip. The control module is integrated into a sealed cavity in the side wall of the guide sleeve 32, and includes a comparator circuit, a signal conversion chip, and a microcontroller.

[0027] During mold closing, if the guide post 31 is under pressure on one side due to template parallelism deviation, the corresponding wedge-shaped elastic unit 41 will be compressed, increasing the contact pressure between the flexible piezoresistive film 42 and the guide post 31, thus decreasing the resistance value in the detection area. The control module collects the resistance signal in real time and converts it into a pressure value. The off-center load location and severity are fed back through the color and dynamic effect of the LED light strip 5. For example, when the pressure in the left front detection area rises above the threshold, the LED turns red and reaches 100% brightness, prompting an immediate shutdown for adjustment.

[0028] In one possible implementation, the outer wall of the guide sleeve 32 is provided with a transparent observation window 6 corresponding to the LED light strip 5, and the inner side of the transparent observation window 6 is provided with a diffuser film for uniformly diffusing the LED light.

[0029] Combined with reference Figure 1As shown, in this embodiment, a rectangular observation window is opened on the outer wall of the guide sleeve 32. The observation window is sealed with tempered glass, and a PET diffuser film with a light diffusion coefficient of 90% is attached to the inner side. An RGB tri-color LED strip 5 is installed behind the observation window. The strip is composed of surface-mount LEDs, and its brightness is controlled by a constant current drive circuit. When the guide post 31 is in a normal state, the LED strip 5 emits a uniform green backlight; when the elastic buffer component 4 is pressed, causing the guide post 31 to shift, the LED strip 5 corresponding to the observation window on the pressed side automatically switches to a red gradient light effect, with the color depth gradually changing from pink to dark red as the pressure increases. The diffuser film enables the LED light to form a glare-free surface light source, ensuring clear visibility even in the strong light environment of the injection molding workshop.

[0030] In one possible implementation, the guide post 31 and the guide sleeve 32 are fixed to the outer side walls of the upper template 1 and the lower template 2 respectively by the first connecting seat 71 and the second connecting seat 72, and the first connecting seat 71 and the second connecting seat 72 are located on the outer side of the template closing end face.

[0031] Combined with reference Figure 1 As shown, in this embodiment, the guide post 31 and guide sleeve 32 adopt an external mounting structure to optimize the internal space layout of the mold and enhance the stability of the guiding mechanism. Specifically, the guide post 31 is fixed to the outer wall of the lower template 2 via a first connecting seat 71, which is integrally formed from high-strength cast iron. The guide sleeve 32 is installed on the corresponding position on the outer side of the upper template 1 via a second connecting seat 72. The second connecting seat 72 is designed as an L-shaped cast steel component, with its vertical arm positioned by a pin and welded to the template, and its horizontal arm end machined with a precision stop for nesting the guide sleeve 32. The mounting reference surfaces of the first connecting seat 71 and the second connecting seat 72 are both located on the outer side of the template closing end face, causing the guide post 31 guiding system to move outward as a whole, which avoids interference with the core-pulling mechanism inside the mold cavity and forms a larger lever arm structure to resist the off-center load moment.

[0032] In one possible implementation, the guide post 31 includes an integrally formed guide portion 311 and a fixing portion 312. The guide portion 311 is a column with a square cross-section, and the fixing portion 312 is cylindrical. The first connecting seat 71 is provided with a mounting hole 711 that matches the fixing portion 312. The fixing portion 312 is inserted into the mounting hole 711. The side wall of the first connecting seat 71 is provided with a radially penetrating locking pin hole 712. The fixing portion 312 is provided with an annular locking groove 313 at the position corresponding to the locking pin hole 712. A locking pin is inserted into the locking pin hole 712, and the inner end of the locking pin is embedded in the annular locking groove 313 to limit the axial displacement of the guide post 31.

[0033] Combined with reference Figure 1 and Figure 3As shown, in this embodiment, the guide post 31 adopts a split structure design, consisting of an integrally formed guide part 311 and a fixing part 312. The guide part 311 is made of high-strength alloy steel and machined into a square column with a cross-section of [value missing]. All four edges are machined with transition rounded corners to reduce stress concentration. The fixing part 312 is a precision-ground cylinder, connected to the guide part 311 via a stepped shaft transition. The first connecting seat 71 has a cylindrical mounting hole 711, with two O-ring grooves on the inner wall of the hole to enhance dustproof sealing. During installation, the fixing part 312 is inserted into the mounting hole 711 with a clearance fit and positioned through the locking pin hole 712 on the side wall of the first connecting seat 71. The fixing part 312 has a corresponding annular locking groove 313 machined. When the locking pin is inserted, its inner end arc surface forms a surface contact with the locking groove for locking. The outer end of the locking pin has an anti-loosening thread and is tightened with a nut to ensure it will not fall off under vibration conditions. This structure enables quick assembly and disassembly of the guide post 31.

[0034] In one possible implementation, the inner wall of the mounting cylinder of the guide post 31 is provided with an axial groove 81, and the end of the guide post 31 is provided with a guide key 82 that mates with the axial groove 81. The guide post 31 can be slidably inserted into or removed from the mounting cylinder along the axial groove 81. Specifically, the mounting structure of the guide post 31 in this embodiment adopts a keyway guide design. Two symmetrically distributed axial grooves 81 are machined on the inner wall of the mounting cylinder, and the groove cross-section is T-shaped. The end of the guide post 31 is correspondingly provided with a guide key 82 made of high-strength alloy steel. The guide key 82 is press-fitted to the body of the guide post 31 with an interference fit, and its outer contour maintains a clearance fit with the groove. During installation, the guide key 82 is guided along the groove to achieve precise positioning of the guide post 31 and avoid circumferential rotation; during disassembly, the guide post 31 can be quickly removed by pulling in the opposite direction.

[0035] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0036] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A deformation-resistant plastic mold support frame, comprising an upper mold plate, a lower mold plate, and a guide structure connecting the two, wherein the guide structure includes guide posts fixed to the upper mold plate and guide sleeves disposed on the lower mold plate, characterized in that, An elastic buffer assembly is provided between the inner wall of the guide sleeve and the guide post. The elastic buffer assembly includes a plurality of symmetrically distributed wedge-shaped elastic units, each of which is in contact with the surface of the guide post. A flexible piezoresistive film is attached to the inner side of the wedge-shaped elastic unit, and the resistance value of the flexible piezoresistive film changes with the pressure on one side of the guide post. The outer wall of the guide sleeve is provided with an LED light strip, which is distributed around the guide post in a circumferential direction and is electrically connected to the flexible piezoresistive film. The guide sleeve is also equipped with a control module, which is used to drive the LED light strip to gradually change the color of the light emission according to the resistance change of the flexible piezoresistive film, so as to dynamically indicate the pressure state of the corresponding guide post.

2. The anti-deformation plastic mold support frame according to claim 1, characterized in that, The outer wall of the guide sleeve is provided with a transparent observation window corresponding to the LED light strip, and the inner side of the transparent observation window is provided with a diffuser film for uniformly diffusing the LED light.

3. The anti-deformation plastic mold support frame according to claim 1, characterized in that, The guide post and guide sleeve are fixed to the outer side walls of the upper and lower templates respectively by the first connecting seat and the second connecting seat, and the first connecting seat and the second connecting seat are located on the outer side of the template closing end face.

4. The anti-deformation plastic mold support frame according to claim 3, characterized in that, The guide post includes an integrally formed guide part and a fixing part. The guide part is a column with a square cross-section, and the fixing part is cylindrical. The first connecting seat has a mounting hole that matches the fixing part. The fixing part is inserted into the mounting hole. The side wall of the first connecting seat has a radially penetrating locking pin hole. The fixing part has an annular locking groove at the position corresponding to the locking pin hole. A locking pin is inserted into the locking pin hole. The inner end of the locking pin is embedded in the annular locking groove to limit the axial displacement of the guide post.

5. The anti-deformation plastic mold support frame according to claim 4, characterized in that, The inner wall of the guide post mounting cylinder is provided with an axial sliding groove, and the end of the guide post is provided with a guide key that cooperates with the axial sliding groove. The guide post can be slidably inserted into or removed from the mounting cylinder along the axial sliding groove.

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