Anti-burr mold for plastic product

Abstract

The utility model discloses an anti-burr mold for plastic products, which relates to the technical field of plastic molds and comprises a lower support plate, a controller mounted on the front side of the lower support plate, a lower mold mounted on the upper surface of the lower support plate, a hydraulic telescopic rod mounted on the upper surface of an upper support plate, and a lifting plate fixedly connected to the telescopic end of the hydraulic telescopic rod. A male die is arranged on the lower surface of the upper die, a die cavity is formed between the male die and the die cavity, a fixing block is fixedly connected to the surface of the cavity, a movable rod is slidably connected to the surface of the fixing block, a rack is fixedly connected to the upper end face of the movable rod, a plug is fixedly connected to the upper end face of the rack, and a plug groove is formed between the cavity and the die cavity. Through the arrangement of the pre-storage tank, the first negative pressure pump, the cavity, the movable rod, the rack, the plug, the plug groove, the second negative pressure pump, the rack, the servo motor, the rotating shaft and the gear, the purposes of better burr prevention effect and improved sealing effect are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic molds, in particular to a burr-proof mold for plastic products. Background Art

[0002] Plastic molds are tools used in the plastics processing industry, along with plastic molding machines, to give plastic products their complete shape and precise dimensions. Due to the wide variety of plastic types and processing methods, as well as the varying complexity of plastic molding machines and plastic products, plastic mold types and structures are also diverse. Products processed using existing plastic molds often develop burrs due to problems such as mold tightening or air trapped inside, which can easily cause numerous inconveniences.

[0003] A burr-proof mold for plastic products disclosed in the Chinese utility model patent application disclosure CN217434788U, although the utility model can discharge a large amount of gas by allowing the gas in the mold cavity to flow into the one-way valve groove, pushing the one-way valve ball and then flowing into the air, but during the injection molding process, there will still be a part of the air, which is still easy to cause the gas to be trapped in the mold cavity, resulting in the generation of burrs, and has the disadvantage of poor anti-burr effect. In addition, the utility model uses a reset spring to push the trapezoidal block at the restriction port. Due to the presence of a certain pressure during the injection molding process, it is easy to cause the trapezoidal block to loosen, thereby causing the molten plastic to enter the one-way valve groove, causing the valve groove to be blocked, and has the disadvantage of poor sealing effect. Utility Model Content

[0004] (1) Technical problems solved

[0005] In view of the deficiencies in the prior art, the present invention provides a burr-proof mold for plastic products, which solves the problems raised in the above-mentioned background technology.

[0006] (2) Technical solution

[0007] To achieve the above purpose, the utility model is implemented through the following technical solutions: a burr-proof mold for plastic products, comprising a lower support plate, the lower surface of the lower support plate is fixedly connected to a support leg, a controller is installed on the front of the lower support plate, a lower mold is installed on the upper surface of the lower support plate, a mold groove is opened on the upper surface of the lower mold, the upper surface of the lower support plate is fixedly connected to a column, the upper end surface of the column is fixedly connected to the upper support plate, a hydraulic telescopic rod is installed on the upper surface of the upper support plate, the telescopic end of the hydraulic telescopic rod is fixedly connected to a lifting plate, the lower surface of the lifting plate is installed with an upper mold, and the lower surface of the upper mold is fixedly connected to the upper end surface of the column. A punch is provided, a mold cavity is provided between the punch and the mold groove, a through groove is provided on the upper surface of the upper support plate, a pre-storage tank is slidably connected to the surface of the through groove, the upper surface of the pre-storage tank is connected to the injection tank, a first solenoid valve is installed on the surface of the injection tank, an injection tube communicating with the mold cavity is provided on the surface of the lifting plate and the upper mold, a connected cavity is provided on the lower surface of the lower support plate and the lower mold, a fixed block is fixedly connected to the surface of the cavity, a movable rod is slidably connected to the surface of the fixed block, a rack is fixedly connected to the upper end surface of the rack, a plug is fixedly connected to the upper end surface of the rack, and a plug groove is provided in the middle of the cavity and the mold cavity.

[0008] Optionally, a sliding hole that matches the size of the column is opened on the surface of the lifting plate, and the lifting plate slides on the surface of the column.

[0009] Optionally, a first negative pressure pump is installed on the outer surface of the upper part of the pre-storage tank, the air inlet end of the first negative pressure pump is arranged in the pre-storage tank, an air pipe is provided on the other side of the pre-storage tank, and a second solenoid valve is installed on the surface of the air pipe.

[0010] Optionally, the lower end of the pre-storage tank is communicated with the injection tube, and a third solenoid valve is installed at the connection between the pre-storage tank and the injection tube.

[0011] Optionally, the numerical positions of the blockage and the blocking groove are compared and the sizes are matched.

[0012] Optionally, a groove is provided on the side of the cavity, a servo motor is installed on the outer surface of the lower mold, the output end of the servo motor is fixedly connected to a lifting plate, bearings are provided at the connection between the two ends of the rotating shaft and the groove, and a gear is fixedly connected to the surface of the rotating shaft, and the gear and the rack are engaged for transmission.

[0013] Optionally, a second negative pressure pump is installed on the lower surface of the middle part of the lower support plate, and the air inlet end of the second negative pressure pump is arranged in the cavity.

[0014] Optionally, a controller is installed on the outer surface of the lower support plate, and the controller is electrically connected to the hydraulic telescopic rod, the first solenoid valve, the air pipe, the second solenoid valve, the third solenoid valve, the servo motor and the second negative pressure pump through wires.

[0015] The utility model provides a burr-proof mold for plastic products, which has the following beneficial effects:

[0016] 1. The burr-proof mold for plastic products reduces the gas in the mold cavity by arranging a pre-storage tank, a first negative pressure pump, a cavity, a movable rod, a rack, a blockage, a blocking groove and a second negative pressure pump. It can help the molten plastic flow more evenly to various parts of the mold cavity, reduce the possibility of bubbles and uneven filling, thereby preventing the generation of burrs and achieving the purpose of better anti-burr effect.

[0017] 2. This burr-proof mold for plastic products is equipped with a rack, a servo motor, a rotating shaft and a gear. The gear drives the rack so that the movable rod fixedly connected to the lower surface of the rack slides upward on the surface of the fixed block, and then the plug on the upper surface of the rack is inserted into the plugging groove and pressed tightly to complete the sealing. At the same time, it plays a role in fixing the plug in the plugging groove, has stronger stability, and achieves the purpose of improving the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the front section of the utility model;

[0020] Figure 3 For this utility model Figure 2 Schematic diagram of the structure at A in the middle;

[0021] Figure 4 For this utility model Figure 2 Schematic diagram of the structure at B in the middle;

[0022] Figure 5 This is a schematic diagram of the structure of the side cross-section of the utility model;

[0023] Figure 6 For this utility model Figure 5 Schematic diagram of the structure at point C in the middle.

[0024] In the figure: 1. Lower support plate; 2. Support leg; 3. Controller; 4. Lower mold; 401. Mold groove; 5. Column; 6. Upper support plate; 7. Hydraulic telescopic rod; 8. Lifting plate; 9. Upper mold; 901. Punch; 10. Mold cavity; 11. Through groove; 12. Pre-storage tank; 13. Injection tank; 14. First solenoid valve; 15. First negative pressure pump; 16. Air pipe; 17. Second solenoid valve; 18. Injection tube; 19. Third solenoid valve; 20. Cavity; 21. Fixed block; 22. Movable rod; 23. Rack; 24. Blockage; 25. Blockage groove; 26. Groove; 27. Servo motor; 28. Rotating shaft; 29. ​​Gear; 30. Second negative pressure pump. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] Example 1

[0027] See also Figures 1 to 4 The utility model provides a technical solution: a burr-proof mold for plastic products, comprising a lower support plate 1, a support leg 2 being fixedly connected to the lower surface of the lower support plate 1, a controller 3 being installed on the front surface of the lower support plate 1, a lower mold 4 being installed on the upper surface of the lower support plate 1, a mold groove 401 being formed on the upper surface of the lower mold 4, a column 5 being fixedly connected to the upper surface of the column 5, an upper support plate 6 being fixedly connected to the upper surface of the upper support plate 6, a hydraulic telescopic rod 7 being installed on the upper surface of the upper support plate 6, and a lifting plate 8 being fixedly connected to the telescopic end of the hydraulic telescopic rod 7. The surface of the lifting plate 8 is provided with a sliding hole that matches the size of the column 5. The lifting plate 8 slides on the surface of the column 5. The lower surface of the lifting plate 8 is installed with an upper mold 9. The lower surface of the upper mold 9 is provided with a punch 901. A mold cavity 10 is provided between the punch 901 and the mold groove 401. The upper surface of the upper support plate 6 is provided with a through groove 11. The surface of the through groove 11 is slidably connected to a pre-storage tank 12. The upper surface of the pre-storage tank 12 is connected to a material injection tank 13. The surface of the material injection tank 13 is installed with a first solenoid valve 14. A first negative pressure pump 15 is installed on the outer surface of the upper part of the pre-storage tank 12, and the air inlet end of the first negative pressure pump 15 is arranged in the pre-storage tank 12. An air pipe 16 is provided on the other side of the pre-storage tank 12, and a second solenoid valve 17 is installed on the surface of the air pipe 16. An injection tube 18 communicating with the mold cavity 10 is provided on the surface of the lifting plate 8 and the upper mold 9. The lower end of the pre-storage tank 12 is communicated with the injection tube 18, and a third solenoid valve 19 is installed at the connection between the pre-storage tank 12 and the injection tube 18. A connecting cavity 20 is provided on the lower surface of the lower support plate 1 and the lower mold 4. A fixed block 21 is fixedly connected to the surface of the cavity 20, and a movable rod 22 is slidably connected to the surface of the fixed block 21. The upper end surface of the movable rod 22 is fixedly connected to a rack 23, and the upper end surface of the rack 23 is fixedly connected to a plug 24. A plugging groove 25 is provided in the middle of the cavity 20 and the mold cavity 10. The numerical positions of the plug 24 and the plugging groove 25 are relative, and the sizes are adapted.

[0028] In order to achieve a better anti-burr effect, when in use, the hydraulic telescopic rod 7 drives the lifting plate 8 to move downward, so that the upper mold 9 and the lower mold 4 are closed, the punch 901 is inserted into the mold groove 401, and the middle of the punch 901 and the mold groove 401 forms a mold cavity 10. The valve plate of the third solenoid valve 19 is controlled by the controller 3 to be closed. At this time, the mold cavity 10 is in a sealed state, and then the movable rod 22 is controlled to move downward on the surface of the fixed block 21 to move the plug 24 out of the plugging groove 25. At this time, the mold cavity 10 is connected with the cavity 20, and then the second negative pressure pump 30 is turned on. The second negative pressure pump 30 pumps out the air in the mold cavity 10 and the cavity 20. At this time, the mold cavity 10 is in a negative pressure state. Then the movable rod 22 is controlled to move upward on the surface of the fixed block 21 to reinsert the plug 24 into the plugging groove 25. At this time, the mold cavity 10 is isolated from the outside world. At the same time, the mold cavity 10 is in a negative pressure state. Then the staff injects a certain amount of molten plastic into the injection tank 13 (the amount of plastic must not exceed the height of the first negative pressure pump 15 and the air pipe 16). The molten plastic contains bubbles. In order to improve the quality of the molten plastic, a certain amount of molten plastic is injected into the pre-stored After the tank 12 is filled, the valve plate of the first solenoid valve 14 is closed, and then the first negative pressure pump 15 is opened to pump negative pressure into the pre-storage tank 12. When the ambient pressure in the pre-storage tank 12 decreases, the gas will expand and try to fill the surrounding space, which makes the bubbles in the molten plastic unstable and easy to be discharged. Since the ambient pressure in the pre-storage tank 12 is low, the bubbles will rise rapidly and escape into the molten plastic, thereby reducing the bubbles in the molten plastic and improving the quality of the molten plastic. After completion, the second solenoid valve 17 is opened again, and the outside air enters the pre-storage tank 12 through the air pipe 16. , so that the air pressure on the upper part of the pre-storage tank 12 is consistent with the outside world. Since the injection tube 18 is connected to the mold cavity 10 during the closing process of the lower mold 4 and the upper mold 9, and finally the valve plate of the third solenoid valve 19 is opened, the mold cavity 10 is in a negative pressure state. At this time, the molten plastic in the pre-storage tank 12 is sucked into the mold cavity 10. By setting the negative pressure, the gas in the mold cavity 10 is reduced, which can help the molten plastic flow more evenly to various parts of the mold cavity 10, reduce the possibility of bubbles and uneven filling, thereby preventing the generation of burrs and achieving the purpose of better anti-burr effect.

[0029] Example 2

[0030] See also Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 6The utility model provides a technical solution: a burr-proof mold for plastic products, comprising a lower support plate 1, a cavity 20 is provided on the lower surface of the lower support plate 1 and the lower mold 4, a fixed block 21 is fixedly connected to the surface of the cavity 20, a movable rod 22 is slidably connected to the surface of the fixed block 21, a rack 23 is fixedly connected to the upper end surface of the movable rod 22, a plug 24 is fixedly connected to the upper end surface of the rack 23, a plugging groove 25 is provided between the cavity 20 and the mold cavity 10, a groove 26 is provided on the side of the cavity 20, a servo motor 27 is installed on the outer surface of the lower mold 4, and the servo motor 2 The output end of 7 is fixedly connected to the lifting plate 8, and bearings are provided at the connection between the two ends of the rotating shaft 28 and the groove 26. The surface of the rotating shaft 28 is fixedly connected to the gear 29, and the gear 29 is engaged with the rack 23 for transmission. The lower surface of the middle part of the lower support plate 1 is provided with a second negative pressure pump 30, and the air inlet end of the second negative pressure pump 30 is provided in the cavity 20. The outer surface of the lower support plate 1 is provided with a controller 3, and the controller 3 is electrically connected to the hydraulic telescopic rod 7, the first solenoid valve 14, the air pipe 16, the second solenoid valve 17, the third solenoid valve 19, the servo motor 27 and the second negative pressure pump 30 through wires.

[0031] In order to achieve the purpose of improving the sealing effect, when in use, after the environment in the mold cavity 10 is in a negative pressure state, the staff controls the output end of the servo motor 27 to rotate forward, and the servo motor 27 drives the rotating shaft 28 to rotate, and the rotating shaft 28 drives the gear 29, and the gear 29 drives the rack 23, so that the movable rod 22 fixedly connected to the lower surface of the rack 23 slides upward on the surface of the fixed block 21, and then the plug 24 on the upper surface of the rack 23 is inserted into the plugging groove 25 and pressed tightly to complete the sealing. At the same time, it plays the role of fixing the plug 24 to the plugging groove 25, has stronger stability, and achieves the purpose of improving the sealing effect.

[0032] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A burr-proof mold for plastic products, comprising a lower support plate, characterized in that: The lower surface of the lower support plate is fixedly connected with a supporting leg, a controller is installed on the front of the lower support plate, a lower mold is installed on the upper surface of the lower support plate, a mold groove is opened on the upper surface of the lower mold, a column is fixedly connected to the upper surface of the lower support plate, the upper end surface of the column is fixedly connected to the upper support plate, a hydraulic telescopic rod is installed on the upper surface of the upper support plate, the telescopic end of the hydraulic telescopic rod is fixedly connected with the lifting plate, the lower surface of the lifting plate is installed with an upper mold, a punch is provided on the lower surface of the upper mold, a mold cavity is provided between the punch and the mold groove, and the upper support plate is fixedly connected with the upper end surface of the upper support plate. A through groove is provided on the upper surface of the support plate, and a pre-storage tank is slidably connected to the surface of the through groove, and an injection tank is connected to the upper surface of the pre-storage tank, and a first solenoid valve is installed on the surface of the injection tank. An injection tube communicating with the mold cavity is provided on the surface of the lifting plate and the upper mold, and a connected cavity is provided on the lower surface of the lower support plate and the lower surface of the lower mold, and a fixed block is fixedly connected to the surface of the cavity, and a movable rod is slidably connected to the surface of the fixed block, and the upper end face of the movable rod is fixedly connected to a rack, and the upper end face of the rack is fixedly connected to a plug, and a plugging groove is provided in the middle of the cavity and the mold cavity.

2. The burr-proof mold for plastic products according to claim 1, characterized in that: The surface of the lifting plate is provided with a sliding hole which is adapted to the size of the column, and the lifting plate slides on the surface of the column.

3. The burr-proof mold for plastic products according to claim 1, characterized in that: A first negative pressure pump is installed on the outer surface of the upper part of the pre-storage tank, and the air inlet end of the first negative pressure pump is arranged in the pre-storage tank. An air pipe is arranged on the other side of the pre-storage tank, and a second solenoid valve is installed on the surface of the air pipe.

4. The burr-proof mold for plastic products according to claim 1, characterized in that: The lower end of the pre-storage tank is communicated with the injection molding pipe, and a third electromagnetic valve is installed at the connection between the pre-storage tank and the injection molding pipe.

5. The burr-proof mold for plastic products according to claim 1, characterized in that: The numerical positions of the blockage and the blocking groove are compared and the sizes are matched.

6. The burr-proof mold for plastic products according to claim 1, characterized in that: A groove is provided on the side of the cavity, a servo motor is installed on the outer surface of the lower mold, the output end of the servo motor is fixedly connected to a lifting plate, bearings are provided at the connection between the two ends of the rotating shaft and the groove, and a gear is fixedly connected to the surface of the rotating shaft, and the gear and the rack are engaged for transmission.

7. The burr-proof mold for plastic products according to claim 1, characterized in that: A second negative pressure pump is installed on the lower surface of the middle part of the lower support plate, and the air inlet end of the second negative pressure pump is arranged in the cavity.

8. The burr-proof mold for plastic products according to claim 1, characterized in that: A controller is installed on the outer surface of the lower support plate, and the controller is electrically connected to the hydraulic telescopic rod, the first solenoid valve, the air pipe, the second solenoid valve, the third solenoid valve, the servo motor and the second negative pressure pump through wires.

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