Plastic processing production mold stripping assembly and method thereof

Abstract

The invention discloses a plastic processing production mold stripping assembly and method, and relates to the technical field of plastic processing production molds, the plastic processing production mold stripping assembly and method comprise a lower mold, the upper side surface of the lower mold is provided with a forming cavity, and the lower mold is internally provided with a driving cavity; a lifting plate is arranged in the driving cavity, ejector pins are fixedly connected to the upper side surface of the lifting plate, a cavity is formed in the lower mold, through grooves are formed in the upper side surface and the lower side surface of the cavity, the through groove in the upper side extends into the forming cavity, and the through groove in the lower side extends into the driving cavity. A displacement cylinder is slidably connected into the cavity, a compressor is matched with a first conveying pipe, a concentration groove and a conveying channel to feed compressed air into the forming cavity, the compressed air is used for slightly lifting a workpiece, and therefore the problem that when an ejector pin jacks up, the workpiece is tightly attached to the bottom wall of the forming cavity, and damage is likely to happen is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of plastic processing production molds, and in particular to a plastic processing production mold stripping component and a method thereof. Background Art

[0002] The base of the writing board is the basic component that supports the writing board. It is mostly a rectangular or circular plate structure, mainly made of plastic, which is both light and stable. The bottom is often designed with anti-slip patterns or rubber pads to prevent sliding during use. There may be buckles or grooves on the side to facilitate assembly with the writing board body. Some bases have built-in storage space for pens, notes and other stationery to improve practicality. Its surface is flat, ensuring that the writing board remains level after being placed, providing stable support for writing and drawing. It is widely used in office, study and other scenarios.

[0003] In the prior art, the injection molding process is generally used to produce the tablet base, but it is difficult to demold. Therefore, the workpiece is usually slightly lifted at the bottom with the help of an ejector pin to facilitate demolding. However, when demolding with the help of the ejector pin, if the workpiece fits tightly with the mold, the ejector pin needs to overcome a large frictional resistance, which may cause the workpiece to be stretched or demolding failure. In view of this, we propose a plastic processing production mold demolding component and a method thereof. Summary of the Invention

[0004] The object of the present invention is to provide a plastic processing mold stripping assembly and method thereof to solve the problems raised in the above background technology.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: a plastic processing mold stripper assembly and method thereof, comprising a lower mold, a molding cavity being defined on the upper surface of the lower mold, a driving cavity being defined within the lower mold, a lifting plate being provided within the driving cavity, an ejector pin being fixedly connected to the upper surface of the lifting plate, a cavity being defined within the lower mold, through grooves being defined on the upper and lower surfaces of the cavity, the through groove on the upper side extending into the molding cavity, and the through groove on the lower side extending into the driving cavity, a displacement cylinder being slidably connected to the cavity, a displacement plate being provided on the upper surface of the displacement cylinder, a spring being fixedly connected to the lower surface of the displacement plate, the lower end of the spring being fixedly connected to the upper end of the ejector pin, a central groove being defined on the top wall of the driving cavity, a transmission channel being defined on the top wall of the central groove, the transmission channel being communicated with the interior of the cavity, a compressor being fixedly connected to the rear surface of the lower mold, a first transmission pipe being fixedly connected to the compressor, an end of the first transmission pipe extending into the driving cavity and communicating with the central groove, and a stripper assembly being provided within the driving cavity.

[0006] Preferably, the demolding assembly includes a hydraulic push rod, which is fixedly connected to the bottom wall of the driving cavity, and the output end of the hydraulic push rod is fixedly connected to the lower surface of the lifting plate. The lower surface of the displacement plate is fixedly connected to a limiting rod, and the inner wall of the lower through groove is fixedly connected to a guide sleeve, and the ejector sliding sleeve is arranged inside the guide sleeve.

[0007] Preferably, the lower end of the limiting rod slides through the lower surface of the guide sleeve, the upper and lower surfaces of the displacement cylinder are fixedly connected with a first sealing ring, and the upper surface of the displacement cylinder is provided with a protrusion.

[0008] Preferably, a second sealing ring is fixedly connected to the upper surface of the protrusion, the second sealing ring contacts the lower surface of the displacement plate, the protrusion is adapted to the through groove, a guide rod is fixedly connected between the upper and lower inner walls of the driving cavity, and the upper surface of the lifting plate is provided with a guide groove extending from its lower surface.

[0009] Preferably, the guide rod is located inside the guide groove, and a ball is movably connected to the inner wall of the guide groove.

[0010] Preferably, the ball contacts the outer surface of the guide rod, the bottom wall of the driving cavity is provided with a cooling channel, the inner wall of the molding cavity is provided with an air outlet communicating with the interior of the cooling channel, and the rear surface of the lower mold is fixedly connected to a cooling fan.

[0011] Preferably, the air cooler is provided with a second transmission pipe, and an end portion of the second transmission pipe passes through the interior of the driving cavity.

[0012] Preferably, one end of the second transmission tube located inside the driving cavity is fixedly connected to a shunt tube, and the end of the shunt tube is communicated with the interior of the cooling channel. A clearance groove is provided on the lifting plate.

[0013] A demoulding method for a plastic processing mold stripping component includes the following specific operating methods:

[0014] S1, before molding, a hydraulic push rod is used to push the lifting plate upward. When the lifting plate moves upward, it will drive the ejector pin to move. The ejector pin uses a spring to drive the displacement plate to move. When the displacement plate moves, there is friction between the limit rod and the displacement cylinder. Therefore, when the displacement plate moves, the displacement cylinder will be driven to move synchronously. After the displacement cylinder moves, its upper surface contacts the top wall of the cavity and closes the transmission channel. At this time, the displacement plate is located inside the upper through groove, completing the closure of the through groove.

[0015] S2, after the injection molding of the workpiece is completed, the cold air is transmitted to the inside of the cooling channel through the second transmission pipe and the diversion pipe by the air cooler, and the side of the workpiece is cooled in conjunction with the air outlet, so that the side of the workpiece is separated from the side wall of the molding cavity. At the same time, the compressed air is transmitted to the inside of the central tank through the first transmission pipe by the compressor, and the air is compressed again by the central tank.

[0016] S3, use the hydraulic push rod to control the displacement plate and the displacement cylinder to descend, open the blockage of the transmission channel, and the compressed air enters the interior of the cavity through the transmission channel. At this time, the lower through groove is closed by the displacement cylinder, so the compressed air will enter the interior of the molding cavity through the upper through groove, and use the compressed air to slightly lift the workpiece by one millimeter, so that the lower surface of the workpiece is separated from the bottom wall of the molding cavity.

[0017] S4, after the workpiece is separated, the hydraulic push rod is used again in conjunction with the lifting plate to lift the ejector pin. After the ejector pin is lifted, the spring is used to drive the displacement plate to move upward. After the displacement plate rises, it enters the interior of the molding cavity and lifts the workpiece again to complete the demoulding. When the displacement plate moves significantly, its movement trajectory is restricted by the limit rod. At the same time, when the lifting plate moves, its movement trajectory can be restricted by the guide rod, and the ball bearing can reduce the friction during movement.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The plastic processing mold stripping assembly and method thereof utilize a compressor in conjunction with a first transmission pipe, a centralizing tank, and a transmission channel to deliver compressed air into the interior of a molding cavity, and utilize the compressed air to slightly lift the workpiece, thereby avoiding the problem of the workpiece being tightly fitted to the bottom wall of the molding cavity and easily damaged when the ejector pin is lifted.

[0020] 2. The plastic processing mold stripping assembly and method thereof utilizes cold air to quickly cool the side of the workpiece, causing it to become slightly smaller, thereby facilitating subsequent demolding and avoiding problems such as damage caused by tight fitting.

[0021] 3. The plastic processing mold stripping assembly and method thereof utilize a displacement cylinder to seal the lower through groove when compressed air is blown out, thereby preventing the compressed air from entering the interior of the driving cavity and causing power waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention is further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is a structural schematic diagram of a plastic processing mold stripping assembly and method thereof according to the present invention;

[0024] Figure 2 It is a plan schematic diagram of the present invention;

[0025] Figure 3 It is a schematic diagram of the rear side of the present invention;

[0026] Figure 4 This is a schematic diagram of the driving cavity of the present invention;

[0027] Figure 5 Schematic diagram of the sealing ring of the present invention;

[0028] Figure 6 This is a schematic diagram of the second transmission tube of the present invention;

[0029] Figure 7 for Figure 1 Enlarged view of point A in the middle.

[0030] Figure numerals: 1. lower mold; 2. molding cavity; 3. driving cavity; 4. lifting plate; 5. ejector pin; 6. cavity; 7. displacement cylinder; 8. displacement plate; 9. spring; 10. central groove; 11. transmission channel; 12. compressor; 13. first transmission pipe; 14. hydraulic push rod; 15. limiting rod; 16. through groove; 17. guide sleeve; 18. first sealing ring; 19. protrusion; 20. second sealing ring; 21. guide rod; 22. guide groove; 23. ball; 24. cooling channel; 25. air outlet; 26. air cooler; 27. second transmission pipe; 28. diverter pipe; 29. ​​give way groove. DETAILED DESCRIPTION

[0031] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it should not be understood as a limitation on the scope of protection of the present invention.

[0032] See also Figure 1-7The present invention provides a technical solution: a plastic processing production mold stripping component, including a lower mold 1, a molding cavity 2 is provided on the upper surface of the lower mold 1, a driving cavity 3 is provided inside the lower mold 1, a lifting plate 4 is provided inside the driving cavity 3, and an ejector pin 5 is fixedly connected to the upper surface of the lifting plate 4, a cavity 6 is provided inside the lower mold 1, and through grooves 16 are provided on the upper and lower surfaces of the cavity 6, the upper through groove 16 extends into the interior of the molding cavity 2, and the lower through groove 16 extends into the interior of the driving cavity 3, a displacement cylinder 7 is slidably connected to the interior of the cavity 6, a displacement plate 8 is provided on the upper surface of the displacement cylinder 7, and a spring 9 is fixedly connected to the lower surface of the displacement plate 8, and the lower end of the spring 9 is in contact with the upper end of the ejector pin 5. The ends are fixedly connected, a central groove 10 is provided on the top wall of the driving cavity 3, and a transmission channel 11 is provided on the top wall of the central groove 10. The transmission channel 11 is communicated with the interior of the cavity 6. A compressor 12 is fixedly connected to the rear surface of the lower mold 1, and a first transmission pipe 13 is fixedly connected to the compressor 12. The end of the first transmission pipe 13 passes through the interior of the driving cavity 3 and is communicated with the central groove 10. A demoulding component is provided inside the driving cavity 3. The compressor 12 is used to cooperate with the first transmission pipe 13, the central groove 10 and the transmission channel 11 to send compressed air into the interior of the molding cavity 2, and the compressed air is used to slightly lift the workpiece, thereby avoiding the problem that the workpiece is tightly fitted to the bottom wall of the molding cavity 2 and is easily damaged when the ejector pin 5 is lifted.

[0033] Furthermore, the demoulding assembly includes a hydraulic push rod 14, which is fixedly connected to the bottom wall of the driving chamber 3, and the output end of the hydraulic push rod 14 is fixedly connected to the lower side surface of the lifting plate 4. The lower side surface of the displacement plate 8 is fixedly connected to the limit rod 15, and the inner wall of the lower through groove 16 is fixedly connected to the guide sleeve 17. The ejector pin 5 is slidably sleeved inside the guide sleeve 17, and the lower end of the limit rod 15 slides through the lower side surface of the guide sleeve 17. The upper and lower side surfaces of the displacement cylinder 7 are fixedly connected with a first sealing ring 18, and the upper side surface of the displacement cylinder 7 is provided with a protrusion 19. The upper side surface of the protrusion 19 is fixedly connected with a second sealing ring 20. The second sealing ring 20 contacts the lower side surface of the displacement plate 8, and the protrusion 19 is adapted to the through groove 16. A guide rod 21 is fixedly connected between the upper and lower inner walls of the driving chamber 3, and the upper side surface of the lifting plate 4 is provided with a guide groove 22 extending from its lower side surface. The guide rod 21 is located inside the guide groove 22. A ball 23 is movably connected to the inner wall of the groove 22, and the ball 23 contacts the outer surface of the guide rod 21. A cooling channel 24 is provided on the bottom wall of the driving cavity 3, and an air outlet 25 is provided on the inner wall of the molding cavity 2, which is communicated with the interior of the cooling channel 24. A cooling air blower 26 is fixedly connected to the rear surface of the lower mold 1, and a second transmission pipe 27 is provided on the cooling air blower 26. The end of the second transmission pipe 27 passes through the interior of the driving cavity 3, and the second transmission pipe 27 is fixedly connected to a diverter pipe 28 at one end inside the driving cavity 3. The end of the diverter pipe 28 is communicated with the interior of the cooling channel 24. A clearance groove 29 is provided on the lifting plate 4, and cold air is used to quickly cool the side of the workpiece, making it slightly smaller, thereby facilitating subsequent demoulding and avoiding problems such as damage caused by tight fitting. At the same time, the displacement cylinder 7 can be used to close the lower through groove 16 when compressed air is blown out to avoid compressed air entering the interior of the driving cavity 3 and causing power waste.

[0034] Working principle: Based on the stripping method of the plastic processing production mold stripping component:

[0035] S1. Before forming, the hydraulic push rod 14 is used to push the lifting plate 4 to move upward. When the lifting plate 4 moves upward, it will drive the ejector pin 5 to move. The movement of the ejector pin 5 uses the spring 9 to drive the displacement plate 8 to move. When the displacement plate 8 moves, there is friction between the limit rod 15 and the displacement cylinder 7. Therefore, when the displacement plate 8 moves, the displacement cylinder 7 will be driven to move synchronously. After the displacement cylinder 7 moves, its upper surface contacts the top wall of the cavity 6 and closes the transmission channel 11. At this time, the displacement plate 8 is located inside the upper through groove 16, and the through groove 16 is completely closed.

[0036] S2. After the injection molding of the workpiece is completed, the cold air is transmitted to the inside of the cooling channel 24 through the second transmission pipe 27 and the diversion pipe 28 by the air cooler 26, and the side of the workpiece is cooled in cooperation with the air outlet 25, so that the side of the workpiece is separated from the side wall of the molding cavity 2. At the same time, the compressed air is transmitted to the inside of the central tank 10 through the first transmission pipe 13 by the compressor 12, and the air is compressed again by the central tank 10.

[0037] S3, use the hydraulic push rod 14 to control the displacement plate 8 and the displacement cylinder 7 to descend, open the blockage of the transmission channel 11, and the compressed air enters the interior of the cavity 6 through the transmission channel 11. At this time, the lower through groove 16 is closed by the displacement cylinder 7, so the compressed air will enter the interior of the molding cavity 2 through the upper through groove 16, and use the compressed air to slightly lift the workpiece by one millimeter, so that the lower surface of the workpiece is separated from the bottom wall of the molding cavity 2.

[0038] S4. After the workpieces are separated, the hydraulic push rod 14 is used again to cooperate with the lifting plate 4 to lift the ejector 5. After the ejector 5 is lifted, the spring 9 is used to drive the displacement plate 8 to move upward. After the displacement plate 8 rises, it enters the interior of the molding cavity 2 and lifts the workpiece again to complete the demolding. When the displacement plate 8 moves significantly, its movement trajectory is restricted by the limit rod 15. At the same time, when the lifting plate 4 moves, its movement trajectory can be restricted by the guide rod 21, and the ball 23 can reduce the friction during movement.

[0039] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the scope of the present invention.

Claims

1. A plastic processing mold stripping assembly, comprising a lower mold (1), characterized in that: The upper surface of the lower mold (1) is provided with a molding cavity (2), the interior of the lower mold (1) is provided with a driving cavity (3), the interior of the driving cavity (3) is provided with a lifting plate (4), the upper surface of the lifting plate (4) is fixedly connected with a ejector pin (5), the interior of the lower mold (1) is provided with a cavity (6), the upper and lower surfaces of the cavity (6) are provided with through grooves (16), the upper through groove (16) extends into the interior of the molding cavity (2), and the lower through groove (16) extends into the interior of the driving cavity (3), the interior of the cavity (6) is slidably connected with a displacement cylinder (7), and the upper surface of the displacement cylinder (7) is provided with a displacement plate (8) The lower surface of the displacement plate (8) is fixedly connected to a spring (9), the lower end of the spring (9) is fixedly connected to the upper end of the ejector pin (5), the top wall of the driving cavity (3) is provided with a central groove (10), the top wall of the central groove (10) is provided with a transmission channel (11), the transmission channel (11) is communicated with the interior of the cavity (6), the rear surface of the lower mold (1) is fixedly connected to a compressor (12), the compressor (12) is fixedly connected to a first transmission pipe (13), the end of the first transmission pipe (13) passes through the interior of the driving cavity (3) and is communicated with the central groove (10), and a demoulding component is provided inside the driving cavity (3).

2. A plastic processing mold stripping assembly according to claim 1, characterized in that: The demoulding assembly includes a hydraulic push rod (14), which is fixedly connected to the bottom wall of the driving cavity (3), and the output end of the hydraulic push rod (14) is fixedly connected to the lower surface of the lifting plate (4). The lower surface of the displacement plate (8) is fixedly connected to a limiting rod (15), and the inner wall of the lower through groove (16) is fixedly connected to a guide sleeve (17), and the ejector pin (5) is slidably sleeved inside the guide sleeve (17).

3. A plastic processing mold stripping assembly according to claim 2, characterized in that: The lower end of the limiting rod (15) slides through the lower surface of the guide sleeve (17), the upper and lower surfaces of the displacement cylinder (7) are fixedly connected with a first sealing ring (18), and the upper surface of the displacement cylinder (7) is provided with a protrusion (19).

4. A plastic processing mold stripping assembly according to claim 3, characterized in that: The upper surface of the protrusion (19) is fixedly connected to a second sealing ring (20), and the second sealing ring (20) contacts the lower surface of the displacement plate (8). The protrusion (19) is adapted to the through groove (16). A guide rod (21) is fixedly connected between the upper and lower inner walls of the driving cavity (3). The upper surface of the lifting plate (4) is provided with a guide groove (22) extending from its lower surface.

5. A plastic processing mold stripping assembly according to claim 4, characterized in that: The guide rod (21) is located inside the guide groove (22), and a ball (23) is movably connected to the inner wall of the guide groove (22).

6. A plastic processing mold stripping assembly according to claim 5, characterized in that: The ball (23) contacts the outer surface of the guide rod (21); a cooling channel (24) is provided on the bottom wall of the driving cavity (3); an air outlet (25) communicating with the interior of the cooling channel (24) is provided on the inner wall of the molding cavity (2); and a cooling fan (26) is fixedly connected to the rear surface of the lower mold (1).

7. A plastic processing mold stripping assembly according to claim 6, characterized in that: The cooling fan (26) is provided with a second transmission pipe (27), and the end of the second transmission pipe (27) passes through the interior of the driving cavity (3).

8. The plastic processing mold stripping assembly according to claim 7, characterized in that: One end of the second transmission tube (27) located inside the driving cavity (3) is fixedly connected to a shunt tube (28), and the end of the shunt tube (28) is communicated with the interior of the cooling channel (24). A clearance groove (29) is provided on the lifting plate (4).

9. A method for demoulding a plastic processing mold stripping assembly, comprising the following specific operating methods: S1, before forming, the hydraulic push rod (14) is used to push the lifting plate (4) to move upward. When the lifting plate (4) moves upward, it will drive the ejector pin (5) to move. The ejector pin (5) uses the spring (9) to drive the displacement plate (8) to move. When the displacement plate (8) moves, due to the friction between the limit rod (15) and the displacement cylinder (7), the displacement cylinder (7) will be driven to move synchronously when the displacement plate (8) moves. After the displacement cylinder (7) moves, its upper side surface contacts the top wall of the cavity (6) and closes the transmission channel (11). At this time, the displacement plate (8) is located inside the upper through groove (16), and the through groove (16) is completely closed. S2, after the injection molding of the workpiece is completed, the cold air is transmitted to the interior of the cooling channel (24) through the second transmission pipe (27) in conjunction with the diversion pipe (28) by the cooling air blower (26), and the side of the workpiece is cooled in conjunction with the air outlet (25), so that the side of the workpiece is separated from the side wall of the molding cavity (2). At the same time, the compressed air is transmitted to the interior of the central tank (10) through the first transmission pipe (13) by the compressor (12), and the air is compressed again by the central tank (10). S3, using the hydraulic push rod (14) to control the displacement plate (8) and the displacement cylinder (7) to descend, opening the closure of the transmission channel (11), at this time the compressed air enters the interior of the cavity (6) through the transmission channel (11), at this time the lower side groove (16) is closed by the displacement cylinder (7), so the compressed air will enter the interior of the molding cavity (2) through the upper side groove (16), and use the compressed air to slightly lift the workpiece by one millimeter, so that the lower surface of the workpiece is separated from the bottom wall of the molding cavity (2). S4, after the workpiece is separated, the hydraulic push rod (14) is used again in conjunction with the lifting plate (4) to lift the ejector pin (5). After the ejector pin (5) is lifted, the spring (9) is used to drive the displacement plate (8) to move upward. After the displacement plate (8) rises, it enters the interior of the molding cavity (2) and lifts the workpiece again to complete the demoulding. When the displacement plate (8) moves significantly, its movement trajectory is limited by the limit rod (15). At the same time, when the lifting plate (4) moves, its movement trajectory can be limited by the guide rod (21), and the ball bearing (23) can be used to reduce the friction during movement.

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