Injection mold capable of avoiding surface shrinkage deformation of central grating

Abstract

The utility model relates to the technical field of injection molds, and discloses an injection mold capable of preventing the surface of a central grid from shrinking and deforming, the injection mold comprises a base, a fixed mold is fixedly arranged at the upper end of the base, a U-shaped vertical plate is further fixedly arranged at the upper end of the base, and two electric push rods are symmetrically and fixedly inserted into the horizontal part of the U-shaped vertical plate in a sleeving mode; and the output ends of the lower ends of the two electric push rods are fixedly connected with the same movable mold, the movable mold fixedly communicates with an injection molding pipe, a backflow pipe is installed on the pipe wall of the injection molding pipe, an injection molding speed regulating and controlling mechanism is installed on the backflow pipe, and connecting tightness feedback mechanisms are further installed between the two sides of the movable mold and the U-shaped vertical plate. The injection speed can be rapidly adjusted according to requirements, the working power of the feeding pump does not need to be changed, control is more convenient, and the problem that the local wall thickness of the surface of a product is too large due to the too high injection speed, and then shrinkage deformation is directly caused is solved.

Description

Technical Field

[0001] The present application belongs to the technical field of injection molds, and in particular relates to an injection mold that can prevent the surface of a central grille from shrinking and deforming. Background Art

[0002] During the injection molding process of the central grille product using an injection mold, it is easy for the injection speed to be too fast or the exhaust to be insufficient, resulting in the local wall thickness of the product surface being too thick after injection molding, which will directly lead to shrinkage and deformation.

[0003] A fast injection speed may cause unstable flow of plastic in the mold, resulting in local accumulation. An excessively fast speed may not be able to effectively expel the air in the mold, causing an increase in local wall thickness. A loose mold closure may also cause gas leakage, which in turn leads to excessive wall thickness on the product surface. Currently, the injection speed is mostly adjusted by controlling the power of the feed pump, which is cumbersome and inconvenient, places high demands on the feed pump, and is not easy to adjust. In addition, professional equipment needs to be used to detect whether the mold is tightly closed, which is inefficient and cannot meet actual usage needs well. Utility Model Content

[0004] The purpose of the utility model is to solve the above-mentioned problem and to propose an injection mold which can prevent the surface of the central grille from shrinking and deforming.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] Disclosed is an injection mold capable of preventing the surface of a central grille from shrinking and deforming, comprising a base, a fixed mold being fixedly mounted on the upper end of the base, a U-shaped vertical plate being also fixedly mounted on the upper end of the base, two electric push rods being symmetrically fixedly inserted into the horizontal portion of the U-shaped vertical plate, the lower output ends of the two electric push rods being fixedly connected to the same movable mold, an injection tube being fixedly connected to the movable mold, a return pipe being mounted on the tube wall of the injection tube, an injection speed control mechanism being mounted on the return pipe, and a connection tightness feedback mechanism being mounted between the two sides of the movable mold and the U-shaped vertical plate.

[0007] Preferably, the injection speed control mechanism includes a control shell installed on the reflux pipe, a valve plate is rotatably connected to the control shell through a transmission shaft, the lower end of the transmission shaft passes through the lower end of the control shell and is fixedly connected to an adjusting gear, the upper end of the movable mold is symmetrically fixedly connected to two side plates, an adjusting screw is rotatably connected between the two side plates through a bearing, an adjusting motor is fixedly installed on the outer wall of one of the side plates, the output end of the adjusting motor is fixedly connected to one end of the adjusting screw, the rod wall of the adjusting screw is threadedly sleeved with a moving seat, and the upper end side wall of the moving seat is fixedly connected with an adjusting rack meshing with the adjusting gear.

[0008] Preferably, the connection tightness feedback mechanism includes two fixed sliding rods symmetrically fixedly connected to the upper end of the base and the lower end of the horizontal part of the U-shaped vertical plate, the opposite sides of the movable mold are fixedly connected with a sliding sleeve slidably sleeved with the fixed sliding rod, the outer wall of the sliding sleeve is also fixedly connected to a pressing plate, the vertical part of the U-shaped vertical plate is provided with a strip-shaped through-hole for the pressing plate to extend through, an in-place switch is installed at the bottom of the inner wall of the U-shaped vertical plate corresponding to the strip-shaped through-hole, and an alarm device electrically connected to the in-place switch is also fixedly installed on the outer wall of the U-shaped vertical plate.

[0009] Preferably, a guide slide rod is fixedly connected between the two side plates, and a guide slide hole is provided on the lower side wall of the movable seat for sliding engagement with the guide slide rod.

[0010] Preferably, rubber pads are fixedly connected to the four corners of the bottom of the base.

[0011] Preferably, the electric push rod is electrically connected to a power supply box of an external device through a control switch.

[0012] Compared with the prior art, this application provides an injection mold that can prevent the central grille surface from shrinking and deforming, and has the following beneficial effects:

[0013] 1. The injection mold that can avoid the shrinkage and deformation of the central grille surface is provided with a fixed mold and a movable mold. The electric push rod pushes the movable mold up and down, so that the movable mold and the fixed mold can be fitted together to complete the injection molding operation. The injection tube is used to transport the injection liquid. When it is necessary to adjust different injection speeds to avoid shrinkage and deformation problems caused by excessive local wall thickness of the product, the adjustment motor is started, and the adjustment motor drives the adjustment screw to rotate. The threaded connection between the adjustment screw and the movable seat and the limiting and guiding effect of the guide slide on the movable seat make the movable seat drive the adjustment rack to move, and then the adjustment rack and the adjustment rod are adjusted. The meshing action of the gears drives the transmission shaft to drive the valve plate to rotate in the control housing, so that the on-off cross-sectional area of ​​the control housing is adjusted. The larger the on-off cross-sectional area in the control housing, the more injection liquid refluxes in the return pipe, and the injection liquid flows in the injection pipe relatively less, which reduces the injection speed. Conversely, the smaller the on-off cross-sectional area of ​​the return pipe, the higher the injection speed. The injection speed can be quickly adjusted according to demand without changing the working power of the feed pump, which is more convenient to operate and avoids the problem of excessive local wall thickness on the product surface due to excessive injection speed, which directly leads to shrinkage and deformation.

[0014] 2. The injection mold that can prevent the surface of the central grille from shrinking and deforming has a fixed slide rod and a sliding sleeve. The matching sliding connection between the two makes the relative lowering position of the movable mold accurate, and the connection between the movable mold and the fixed mold more fitting. After the movable mold is completely fitted with the fixed mold, the pressing plate will act on the in-place switch to trigger the alarm. If the alarm is not triggered, it means that the movable mold and the fixed mold are not installed in place, which can give timely feedback to the staff and avoid the problem of loose closure of the injection mold affecting the injection molding quality of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of an injection mold proposed in this application that can prevent the surface of the central grille from shrinking and deforming;

[0016] Figure 2 This is a schematic cross-sectional view of an injection speed control mechanism of an injection mold proposed in this application that can prevent shrinkage and deformation of the central grille surface.

[0017] In the figure: 1. Base; 2. Fixed mold; 3. U-shaped vertical plate; 4. Electric push rod; 5. Moving mold; 6. Injection tube; 7. Return pipe; 8. Control shell; 9. Drive shaft; 10. Valve plate; 11. Adjusting gear; 12. Side plate; 13. Adjusting screw; 14. Adjusting motor; 15. Moving seat; 16. Adjusting rack; 17. Fixed slide bar; 18. Sliding sleeve; 19. Pressing plate; 20. Strip opening; 21. In-position switch; 22. Alarm; 23. Guide slide bar. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0019] Reference Figure 1-2 , an injection mold that can prevent the surface of the central grille from shrinking and deforming, includes a base 1, a fixed mold 2 is fixedly installed on the upper end of the base 1, a U-shaped vertical plate 3 is also fixedly installed on the upper end of the base 1, the horizontal part of the U-shaped vertical plate 3 is symmetrically fixed with two electric push rods 4, the lower end output ends of the two electric push rods 4 are fixedly connected to the same movable mold 5, the movable mold 5 is fixedly connected to an injection pipe 6, the tube wall of the injection pipe 6 is installed with a return pipe 7, the return pipe 7 is installed with an injection speed control mechanism, and a connection tightness feedback mechanism is also installed between the two sides of the movable mold 5 and the U-shaped vertical plate 3.

[0020] The injection speed control mechanism includes a control shell 8 installed on the reflux pipe 7, and a valve plate 10 is rotatably connected to the control shell 8 through a transmission shaft 9. The lower end of the transmission shaft 9 passes through the lower end of the control shell 8 and is fixedly connected to an adjusting gear 11. The upper end of the movable mold 5 is symmetrically fixedly connected to two side plates 12, and an adjusting screw 13 is rotatably connected between the two side plates 12 through a bearing. An adjusting motor 14 is fixedly installed on the outer wall of one of the side plates 12, and the output end of the adjusting motor 14 is fixedly connected to one end of the adjusting screw 13. A movable seat 15 is threadedly sleeved on the rod wall of the adjusting screw 13, and the upper end side wall of the movable seat 15 is fixedly connected to an adjusting rack 16 engaged with the adjusting gear 11.

[0021] The connection tightness feedback mechanism includes two fixed slide bars 17 symmetrically fixedly connected to the upper end of the base 1 and the lower end of the horizontal part of the U-shaped vertical plate 3. The opposite sides of the movable mold 5 are fixedly connected with sliding sleeves 18 that are slidably sleeved with the fixed slide bars 17. The outer wall of the sliding sleeve 18 is also fixedly connected with a pressing plate 19. The vertical part of the U-shaped vertical plate 3 is provided with a strip-shaped opening 20 for the pressing plate 19 to extend through. An in-position switch 21 is installed at the bottom of the inner wall of the U-shaped vertical plate 3 corresponding to the strip-shaped opening 20. The outer wall of the U-shaped vertical plate 3 is also fixedly provided with an alarm device 22 electrically connected to the in-position switch 21.

[0022] A guide slide bar 23 is fixedly connected between the two side plates 12 , and a guide slide hole is formed on the lower side wall of the movable seat 15 , which is slidably sleeved with the guide slide bar 23 .

[0023] Rubber pads are fixedly connected to the four corners of the bottom of the base 1.

[0024] The electric push rod 4 is electrically connected to the power supply box of the peripheral device through a control switch.

[0025] The operating principle of the present invention is now described as follows:

[0026] When the present application is used, the electric push rod 4 pushes the movable mold 5 up and down through the fixed mold 2 and the movable mold 5, so that the movable mold 5 and the fixed mold 2 can be fitted together to complete the injection molding operation. The injection molding tube 6 is used to transport the injection molding liquid. When it is necessary to adjust the injection speed to avoid shrinkage and deformation problems caused by excessive local wall thickness of the product, the adjusting motor 14 is started, and the adjusting motor 14 drives the adjusting screw 13 to rotate. The threaded connection between the adjusting screw 13 and the movable seat 15 and the limiting and guiding effect of the guide slide 23 on the movable seat 15 make the movable seat 15 drive the adjusting rack 16 to move, and then the meshing action of the adjusting rack 16 and the adjusting gear 11 drives the transmission shaft 9 to drive the valve plate 10 to rotate in the regulating shell 8, so that the on-off cross-sectional area of ​​the regulating shell 8 is adjusted. The larger the on-off cross-sectional area in the regulating shell 8, the more the injection molding liquid refluxes in the reflux pipe 7, thereby making the injection molding of the injection molding tube 6 The liquid flow is relatively small, which reduces the injection speed. On the contrary, the smaller the cross-sectional area of ​​the return pipe 7 is, the higher the injection speed is. The injection speed can be adjusted quickly according to demand without changing the working power of the feed pump, which is more convenient to operate and avoids the problem of excessive wall thickness of the product surface caused by excessive injection speed, which directly leads to shrinkage and deformation. The fixed slide rod 17 and the sliding sleeve 18 are matched and slipped together so that the movable mold 5 can be accurately lowered relative to the fixed mold 2, and the connection between the movable mold 5 and the fixed mold 2 is more fitted. After the movable mold 5 is completely fitted with the fixed mold 2, the pressing plate 19 will act on the in-place switch 21 to trigger the alarm 22. If the alarm 22 is not triggered, it means that the movable mold 5 and the fixed mold 2 are not installed in place, which can give the staff timely feedback and avoid the problem of loose closure of the injection mold affecting the injection molding quality of the product.

[0027] The above is only a preferred specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes based on the technical solution and application concept of the present application within the technical scope disclosed in the present application, and they should be covered by the scope of protection of the present application.

Claims

1. An injection mold capable of preventing the surface of a central grille from shrinking and deforming, comprising a base (1), characterized in that: A fixed mold (2) is fixedly mounted on the upper end of the base (1), and a U-shaped vertical plate (3) is also fixedly mounted on the upper end of the base (1). Two electric push rods (4) are symmetrically fixedly inserted and sleeved on the horizontal part of the U-shaped vertical plate (3). The lower output ends of the two electric push rods (4) are fixedly connected to the same movable mold (5). An injection tube (6) is fixedly connected to the movable mold (5). A return tube (7) is mounted on the tube wall of the injection tube (6). An injection speed control mechanism is mounted on the return tube (7). A connection tightness feedback mechanism is also mounted between the two sides of the movable mold (5) and the U-shaped vertical plate (3).

2. The injection mold capable of preventing the surface of the central grille from shrinking and deforming according to claim 1, characterized in that: The injection speed control mechanism comprises a control shell (8) mounted on the return pipe (7), a valve plate (10) being rotatably connected to the control shell (8) via a transmission shaft (9), the lower end of the transmission shaft (9) passing through the lower end of the control shell (8) and being fixedly connected to an adjustment gear (11), the upper end of the movable mold (5) being symmetrically fixedly connected to two side plates (12), an adjustment screw (13) being rotatably connected between the two side plates (12) via a bearing, an adjustment motor (14) being fixedly mounted on the outer wall of one of the side plates (12), the output end of the adjustment motor (14) being fixedly connected to one end of the adjustment screw (13), a movable seat (15) being threadedly sleeved on the rod wall of the adjustment screw (13), and an adjustment rack (16) meshing with the adjustment gear (11) being fixedly connected to the upper side wall of the movable seat (15).

3. The injection mold capable of preventing the surface of the central grille from shrinking and deforming according to claim 2, characterized in that: The connection tightness feedback mechanism comprises two fixed slide bars (17) symmetrically fixedly connected to the upper end of the base (1) and the lower end of the horizontal part of the U-shaped vertical plate (3); the two opposite sides of the movable mold (5) are fixedly connected with sliding sleeves (18) slidably sleeved with the fixed slide bars (17); the outer wall of the sliding sleeve (18) is also fixedly connected with a pressing plate (19); the vertical part of the U-shaped vertical plate (3) is provided with a strip-shaped opening (20) for the pressing plate (19) to extend through; the bottom of the inner wall of the U-shaped vertical plate (3) corresponding to the strip-shaped opening (20) is provided with an in-position switch (21); and the outer wall of the U-shaped vertical plate (3) is also fixedly provided with a warning device (22) electrically connected to the in-position switch (21).

4. The injection mold capable of preventing the surface of the central grille from shrinking and deforming according to claim 3, characterized in that: A guide slide bar (23) is fixedly connected between the two side plates (12), and a guide slide hole slidably sleeved with the guide slide bar (23) is provided on the lower end side wall of the movable seat (15).

5. The injection mold capable of preventing the surface of the central grille from shrinking and deforming according to claim 4, characterized in that: Rubber pads are fixedly connected to the four corners of the bottom of the base (1).

6. The injection mold capable of preventing the surface of the central grille from shrinking and deforming according to claim 5, characterized in that: The electric push rod (4) is electrically connected to a power supply box of an external device via a control switch.

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