Toothpaste cap forming processing device and method

Abstract

The present invention belongs to the technical field of toothpaste cap production, and in particular, to a toothpaste cap molding and processing device and method. The device comprises a machine base, wherein a first fixed plate and a second fixed plate are fixedly connected to the top of the machine base, a movable mold and a fixed mold are arranged between the first fixed plate and the second fixed plate, the fixed mold is fixedly connected to the second fixed plate, an electric push rod is fixedly passed through the first fixed plate, the output shaft of the electric push rod is fixedly connected to the movable mold, an injection molding mechanism is connected to the second fixed plate, and an air channel is respectively defined in each of the male molds on the movable mold, and an air hole is defined at the end of the male mold to communicate with the air channel, and an elastically connected ejector pin for sealing the air hole is provided in the air channel. A negative pressure mechanism is also provided in the movable mold. In the present invention, through the linkage between a negative pressure pump and an ejector pin elastic mechanism, negative pressure is applied to the toothpaste cap to the male mold during demolding. After the negative pressure is turned off, the ejector pin is precisely pushed under the action of a spring, ensuring that the toothpaste cap is quickly released from the mold and prevented from being retained in the female mold of the fixed mold.

Description

Technical Field

[0001] The present invention relates to the technical field of toothpaste cap production, and in particular to a toothpaste cap molding processing device and method. Background Art

[0002] Toothpaste caps are usually manufactured through the injection molding process. After the plastic particles are heated and melted, the molten plastic is injected into a pre-designed injection mold through an injection molding machine, filling the mold cavity and cooling and solidifying. The molded toothpaste cap is obtained after automatic demoulding by the injection mold.

[0003] Traditional demolding mechanisms mostly use mechanical ejection or single negative pressure adsorption. After the toothpaste cap is cooled and formed, it is often retained in the concave mold of the fixed mold due to factors such as mold surface adhesion and plastic shrinkage and deformation. Manual demolding is required, which not only increases labor intensity, but also easily causes damage to the appearance of the toothpaste cap and reduces the product qualification rate. Summary of the Invention

[0004] Based on the technical problems existing in the prior art, the present invention proposes a toothpaste cap molding processing device and method.

[0005] The present invention proposes a toothpaste cap molding processing device and method, which includes a machine base, wherein a first fixed plate and a second fixed plate are fixedly connected to the top of the machine base, a movable mold and a fixed mold are arranged between the first fixed plate and the second fixed plate, the fixed mold is fixedly connected to the second fixed plate, an electric push rod is fixed through the first fixed plate, the output shaft of the electric push rod is fixedly connected to the movable mold, the second fixed plate is connected to an injection molding mechanism, an air channel is respectively opened in each punch on the movable mold, an air hole communicating with the air channel is opened at the end of the punch, an elastically connected ejector pin for sealing the air hole is arranged in the air channel, and a negative pressure mechanism is also arranged in the movable mold; through injection molding The mechanism injects molten plastic into the second fixed plate. After the toothpaste cap is cooled and formed, it is ready to be demoulded. At this time, negative pressure is formed at the air hole by the negative pressure mechanism. The ejector pin will move into the airway under the action of negative pressure, and then the toothpaste cap will be adsorbed on the punch by the negative pressure. Then, the output shaft of the electric push rod drives the movable mold to reset and move for demoulding. In this way, all the toothpaste caps will be adsorbed on the punch. Then, the negative pressure mechanism is closed, and the ejector pin will reset under the action of elastic force and then push the toothpaste cap off the punch. In this way, the toothpaste cap can be demoulded quickly, thereby avoiding the toothpaste cap from being retained in the concave mold on the fixed mold during demoulding.

[0006] Preferably, the negative pressure mechanism includes a negative pressure pump fixedly connected to the inside of the movable mold, and an air pipe is connected to the air outlet pipe of the negative pressure pump, and the other end of the air pipe passes through the movable mold and communicates with the outside world; negative pressure can be formed at the air hole through the negative pressure pump.

[0007] Preferably, a plurality of evenly distributed vertical plates are fixedly connected in the movable mold, and a plurality of ejectors in the same column pass through the vertical plates respectively. A collar is fixedly sleeved on the ejector, and a spring is sleeved on the ejector. The two ends of the spring are respectively fixedly connected to the vertical plates and the collar; the spring can form an elastic connection between the ejector and the vertical plates, and the vertical plates can be used to limit the ejector laterally.

[0008] Preferably, the injection molding mechanism is an injection molding machine fixedly connected to the base, and the discharge pipe of the injection molding machine is connected to the feed hole on the second fixed plate; the mold can be injection-molded by the injection molding machine.

[0009] Preferably, a plurality of guide bolts are inserted into the second fixed plate at the corner positions, and the other ends of the guide bolts pass through the movable mold and are threadedly connected to the first fixed plate; the movable mold can be laterally limited by the guide bolts, making its movement process more stable.

[0010] Preferably, a discharge port is provided on the machine base, and the discharge port is located between the first fixed plate and the second fixed plate. A receiving frame for receiving the toothpaste cap is placed in the discharge port; the toothpaste cap that falls can be received by the receiving frame.

[0011] Preferably, a toothpaste cap molding processing device further includes:

[0012] The pressure detection module is installed in the airway to monitor the negative pressure value in the airway during the adsorption process in real time and generate the adsorption completion coefficient through the control module;

[0013] The displacement detection module is installed at the end of the ejector pin to monitor the ejector pin reset displacement in real time and generate the demoulding stability coefficient through the control module;

[0014] The control module compares the generated adsorption completion coefficient and demoulding stability coefficient with the set threshold values, and controls the working state of the negative pressure pump according to the comparison results.

[0015] Preferably, the output and input ends of the pressure detection module and the output and input ends of the displacement detection module are electrically connected to the input and output ends of the control module respectively, and the output end of the control module is electrically connected to the input end of the negative pressure pump.

[0016] Preferably, the control module controls the working state of the negative pressure pump according to the comparison results in the following steps: the pressure detection module collects the negative pressure value in the airway during the adsorption process; the displacement detection module collects the reset displacement of the ejector pin; the control module calculates the adsorption completion coefficient and the demolding stability coefficient; if the adsorption completion coefficient is less than the set threshold, the negative pressure compensation is started; if the demolding stability coefficient is less than or equal to the set threshold, the vibration-assisted demolding is triggered.

[0017] The present invention also provides a molding method of a toothpaste cap molding device, comprising the following steps:

[0018] First, the molten plastic is injected into the fixed mold through the feed hole of the injection molding machine;

[0019] Second, after the toothpaste cap is cooled and formed, the negative pressure pump is started to form negative pressure at the air hole through the air pipe. The ejector compresses the spring and then separates from the air hole, and the toothpaste cap is adsorbed on the punch.

[0020] Third, when the electric push rod drives the movable mold to reset and demold, the pressure detection module monitors the negative pressure value in the airway in real time and generates an adsorption completion coefficient. The displacement detection module monitors the reset displacement of the ejector pin and generates a demolding stability coefficient. If the adsorption completion coefficient is less than the threshold, the control module starts negative pressure compensation. If the demolding stability coefficient is less than or equal to the set threshold, vibration-assisted demolding is triggered.

[0021] Fourth, finally turn off the negative pressure pump, and the ejector pin pushes the toothpaste cap off the punch under the action of the spring.

[0022] Compared with the prior art, the present invention provides a toothpaste cap molding processing device and method, which has the following beneficial effects:

[0023] 1. A toothpaste cap molding and processing device, which uses a negative pressure pump and an ejector elastic mechanism to absorb the toothpaste cap to the punch during demolding. After the negative pressure is turned off, the ejector pin is pushed accurately by the spring to ensure that the toothpaste cap is quickly separated from the mold and avoids being trapped in the fixed mold.

[0024] 2. A toothpaste cap molding and processing device. The pressure detection module monitors the airway negative pressure value in real time, quantifies the adsorption effect through the adsorption completion coefficient, and automatically activates negative pressure compensation when the negative pressure is insufficient to ensure uniform and stable adsorption force. The displacement detection module tracks the reset displacement of the ejector in real time, predicts the risk of retention through the demolding stability coefficient, triggers vibration-assisted demolding, and improves the pass rate of toothpaste caps.

[0025] 3. A toothpaste cap molding and processing device. The control module integrates pressure and displacement signals through a data fusion algorithm, dynamically adjusts the working state of the negative pressure pump, and forms a "detection-calculation-adjustment" closed-loop system. Compared with traditional open-loop control, the stability and controllability of the demolding process are significantly improved, which is particularly suitable for the flexible production of toothpaste caps of various specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of a toothpaste cap forming and processing device proposed by the present invention;

[0027] Figure 2 This is a schematic diagram of the movable mold structure of a toothpaste cap molding and processing device proposed by the present invention;

[0028] Figure 3 This is a schematic diagram of the fixed mold structure of a toothpaste cap molding and processing device proposed by the present invention;

[0029] Figure 4 This is a schematic structural diagram of a toothpaste cap molding device proposed by the present invention when the movable mold and the fixed mold are closed;

[0030] Figure 5 This is a schematic diagram of the internal structure of a movable mold of a toothpaste cap molding and processing device proposed by the present invention;

[0031] Figure 6 For the present invention Figure 5 A is an enlarged structural diagram of FIG.

[0032] In the figure: 1. Machine base; 2. First fixed plate; 3. Second fixed plate; 4. Moving mold; 5. Fixed mold; 6. Electric push rod; 7. Injection molding machine; 8. Feed hole; 9. Guide bolt; 10. Air duct; 11. Punch; 12. Air hole; 13. Vertical plate; 14. Ejector pin; 15. Spring; 16. Ring; 17. Negative pressure pump; 18. Air pipe; 19. Pressure detection module; 20. Displacement detection module; 21. Control module; 22. Discharge port; 23. Material receiving frame. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described 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.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0035] Reference Figures 1-6 A toothpaste cap molding and processing device includes a machine base 1, a first fixed plate 2 and a second fixed plate 3 are fixedly connected to the top of the machine base 1, a movable mold 4 and a fixed mold 5 are arranged between the first fixed plate 2 and the second fixed plate 3, the fixed mold 5 is fixedly connected to the second fixed plate 3, an electric push rod 6 is fixed through the first fixed plate 2, the output shaft of the electric push rod 6 is fixedly connected to the movable mold 4, the second fixed plate 3 is connected to an injection molding mechanism, each punch 11 on the movable mold 4 is respectively provided with an air channel 10, the end of the punch 11 is provided with an air hole 12 communicating with the air channel 10, an elastically connected ejector pin 14 for sealing the air hole 12 is provided in the air channel 10, and a negative pressure mechanism is also provided in the movable mold 4;

[0036] During use, molten plastic is injected into the second fixed plate 3 through the injection molding mechanism. After the toothpaste cap is cooled and formed, it is ready to be demoulded. At this time, negative pressure is formed at the air hole 12 by the negative pressure mechanism. The ejector pin 14 will move into the airway 10 under the action of the negative pressure, and then the toothpaste cap will be adsorbed on the punch 11 by the negative pressure. Then, the output shaft of the electric push rod 6 drives the movable mold 4 to reset and move for demoulding. In this way, all the toothpaste caps will be adsorbed on the punch 11. Then, the negative pressure mechanism is closed, and the ejector pin 14 will reset under the action of the elastic force and then push the toothpaste cap off the punch 11. In this way, the toothpaste cap can be demoulded quickly, thereby preventing the toothpaste cap from staying in the concave mold on the fixed mold 5 during demoulding.

[0037] The negative pressure mechanism includes a negative pressure pump 17 fixedly connected to the inside of the movable mold 4, and an air pipe 18 is connected to the air outlet pipe of the negative pressure pump 17, and the other end of the air pipe 18 passes through the movable mold 4 and communicates with the outside world;

[0038] When in use, negative pressure can be formed at the air hole 12 through the negative pressure pump 17.

[0039] Among them, a plurality of evenly distributed vertical plates 13 are fixedly connected to the movable mold 4, and a plurality of ejector pins 14 in the same row pass through the vertical plates 13 respectively. A collar 16 is fixedly sleeved on the ejector pins 14, and a spring 15 is sleeved on the ejector pins 14. The two ends of the spring 15 are fixedly connected to the vertical plates 13 and the collar 16 respectively.

[0040] During use, the spring 15 can form an elastic connection between the ejector pin 14 and the vertical plate 13 , and the vertical plate 13 can limit the ejector pin 14 in the horizontal direction.

[0041] The injection molding mechanism is an injection molding machine 7 fixedly connected to the base 1, and the discharge pipe of the injection molding machine 7 is connected to the feed hole 8 on the second fixed plate 3;

[0042] When in use, the mold can be injection-molded by the injection molding machine 7 .

[0043] Furthermore, a plurality of guide bolts 9 are inserted into the second fixing plate 3 at the corner positions, and the other ends of the guide bolts 9 pass through the movable mold 4 and are threadedly connected to the first fixing plate 2;

[0044] When in use, the movable mold 4 can be laterally limited by the guide bolts 9, making its movement process more stable.

[0045] Furthermore, a discharge port 22 is provided on the machine base 1 and is located between the first fixed plate 2 and the second fixed plate 3. A receiving frame 23 for receiving the toothpaste cap is placed in the discharge port 22.

[0046] When in use, the falling toothpaste cap can be received by the receiving frame 23 .

[0047] In another embodiment, a toothpaste cap molding and processing device further includes:

[0048] The pressure detection module 19 is installed in the airway 10 and is used to monitor the negative pressure value in the airway 10 in real time during the adsorption process and generate the adsorption completion coefficient through the control module 21;

[0049] The displacement detection module 20 is installed at the end of the ejector pin 14 and is used to monitor the reset displacement of the ejector pin 14 in real time and generate a demoulding stability coefficient through the control module 21;

[0050] The control module 21 compares the generated adsorption completion coefficient and demoulding stability coefficient with set thresholds respectively, and controls the working state of the negative pressure pump 17 according to the comparison results.

[0051] It should be noted that the pressure detection module 19 can be a pressure sensor or other device capable of monitoring the negative pressure value in the airway 10 in real time during the adsorption process; the displacement detection module 20 can be a displacement sensor or other device capable of monitoring the reset displacement of the ejector pin 14 in real time; the control module 21 is an embedded controller (such as the STM32 series) with an integrated data fusion algorithm. Therefore, the pressure detection module 19, the displacement detection module 20, and the control module 21 are not specifically limited here and can be selected according to actual needs;

[0052] Among them, the output end and input end of the pressure detection module 19 and the output end and input end of the displacement detection module 20 are electrically connected to the input end and output end of the control module 21 respectively, and the output end of the control module 21 is electrically connected to the input end of the negative pressure pump 17.

[0053] In another embodiment, the control module 21 compares the generated adsorption completion coefficient and demolding stability coefficient with the set thresholds respectively, and controls the working state of the negative pressure pump 17 according to the comparison results in the following steps:

[0054] Real-time detection: The pressure detection module 19 collects the negative pressure value in the airway 10 during the adsorption process; the displacement detection module 20 collects the reset displacement of the ejector pin 14;

[0055] Coefficient calculation:

[0056] Adsorption completion coefficient: quantifies the energy accumulation efficiency during the negative pressure adsorption process, reflects the dynamic convergence characteristics of the pressure in the airway 10 from atmospheric pressure to the target negative pressure, and is calculated using the following formula:

[0057]

[0058] Where, is the adsorption duration, is the time-integrated variable, is the real-time pressure value of the nth airway 10, is the preset adsorption pressure threshold;

[0059] Demolding stability coefficient: This coefficient characterizes the ability of the demolding mechanism to overcome mechanical resistance. The retention strength of the toothpaste cap is inferred from the reset deviation of the ejector pin 14, because the retention problem occurs after the ejector pin 14 completes the ejection action.

[0060] Normal situation: the toothpaste cap is completely pushed away from the movable mold and falls freely;

[0061] Abnormal retention: The toothpaste cap is stuck between the ejector pin 14 and the mold cavity due to shrinkage deformation, residual negative pressure, static adsorption, etc., causing the ejector pin 14 to be unable to fully reset (the displacement sensor detects that D_n is not equal to D_0). The toothpaste cap is damaged during the next mold closing cycle.

[0062] The demoulding stability coefficient is calculated by the following formula:

[0063]

[0064] Where, is the real-time displacement of the nth ejector pin 14, To completely reset the ejector pin 14 to its reference position, is the displacement tolerance;

[0065] Dynamic adjustment: If A_f≥0.95, it indicates that the adsorption is complete. If A_f<0.9, it indicates that the adsorption fails, then negative pressure compensation is started. Negative pressure compensation refers to increasing the power of the negative pressure pump 17 to improve the adsorption strength, thereby ensuring that all toothpaste caps are adsorbed onto the punch 11. If E_s>0.98, it indicates that the ejector pin is reset normally. If E_s≤0.98, it indicates that the toothpaste cap is at risk of retention, then vibration-assisted demolding is triggered. Vibration-assisted demolding refers to the repeated inflation and degassing of the negative pressure pump 17 to drive the ejector pin 14 to vibrate back and forth at high frequency to eliminate the risk of retention.

[0066] The present invention also provides a molding method of a toothpaste cap molding device, comprising the following steps:

[0067] First, the molten plastic is injected into the fixed mold 5 through the injection molding machine 7 through the feed hole 8;

[0068] Second, after the toothpaste cap is cooled and formed, the negative pressure pump 17 is started to form negative pressure at the air hole 12 through the air pipe 18. The ejector pin 14 compresses the spring 15 and then separates from the air hole 12. The toothpaste cap is adsorbed on the punch 11.

[0069] Third, when the electric push rod 6 drives the movable mold 4 to reset and demould, the pressure detection module 19 monitors the negative pressure value in the air channel 10 in real time and generates an adsorption completion coefficient. If the adsorption completion coefficient is less than the threshold, the control module 21 starts negative pressure compensation;

[0070] Fourth, finally, turn off the negative pressure pump 17. The ejector pin 14 pushes the toothpaste cap off the punch 11 under the action of the spring 15. The displacement detection module 20 monitors the reset displacement of the ejector pin 14 to generate a demolding stability coefficient. If the demolding stability coefficient is less than or equal to the set threshold, vibration-assisted demolding is triggered.

[0071] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A toothpaste cap forming and processing device, comprising a machine base (1), characterized in that: The top of the machine base (1) is fixedly connected to a first fixed plate (2) and a second fixed plate (3), a movable mold (4) and a fixed mold (5) are provided between the first fixed plate (2) and the second fixed plate (3), the fixed mold (5) is fixedly connected to the second fixed plate (3), an electric push rod (6) is fixedly passed through the first fixed plate (2), the output shaft of the electric push rod (6) is fixedly connected to the movable mold (4), the second fixed plate (3) is connected to an injection molding mechanism, an air channel (10) is respectively provided in each punch (11) on the movable mold (4), an air hole (12) communicating with the air channel (10) is provided at the end of the punch (11), an elastically connected ejector pin (14) for sealing the air hole (12) is provided in the air channel (10), and a negative pressure mechanism is also provided in the movable mold (4); Also includes: The pressure detection module (19) is installed in the airway (10) and is used to monitor the negative pressure value in the airway (10) during the adsorption process in real time, and generate the adsorption completion coefficient through the control module (21), which is calculated by the following formula: Where, is the adsorption duration, is the time-integrated variable, is the real-time pressure value of the nth airway (10), is the preset adsorption pressure threshold; The displacement detection module (20) is installed at the end of the ejector pin (14) and is used to monitor the reset displacement of the ejector pin (14) in real time and generate a demoulding stability coefficient through the control module (21), which is calculated by the following formula: Where, is the real-time displacement of the nth ejector pin (14), To completely reset the ejector pin (14) to its reference position, is the displacement tolerance; The control module (21) compares the generated adsorption completion coefficient and demoulding stability coefficient with the set threshold values, and controls the working state of the negative pressure pump (17) according to the comparison results.

2. A toothpaste cap forming and processing device according to claim 1, characterized in that: The negative pressure mechanism comprises a negative pressure pump (17) fixedly connected to the interior of the movable mold (4); an air pipe (18) is connected to the air outlet pipe of the negative pressure pump (17); the other end of the air pipe (18) passes through the movable mold (4) and communicates with the outside.

3. The toothpaste cap forming and processing device according to claim 1, characterized in that: A plurality of evenly distributed vertical plates (13) are fixedly connected to the movable mold (4), and a plurality of ejector pins (14) in the same row respectively pass through the vertical plates (13). A collar (16) is fixedly sleeved on the ejector pins (14). A spring (15) is sleeved on the ejector pins (14), and two ends of the spring (15) are respectively fixedly connected to the vertical plates (13) and the collar (16).

4. The toothpaste cap forming and processing device according to claim 1, characterized in that: The injection molding mechanism is an injection molding machine (7) fixedly connected to the base (1), and the discharge pipe of the injection molding machine (7) is connected to the feed hole (8) on the second fixed plate (3).

5. The toothpaste cap forming and processing device according to claim 1, characterized in that: A plurality of guide bolts (9) located at corner positions are inserted into the second fixing plate (3), and the other ends of the guide bolts (9) pass through the movable mold (4) and are threadedly connected to the first fixing plate (2).

6. The toothpaste cap forming and processing device according to claim 1, characterized in that: The machine base (1) is provided with a discharge port (22), which is located between the first fixed plate (2) and the second fixed plate (3), and a receiving frame (23) for receiving a toothpaste cap is placed in the discharge port (22).

7. The toothpaste cap forming and processing device according to claim 1, characterized in that: The output end and input end of the pressure detection module (19) and the output end and input end of the displacement detection module (20) are electrically connected to the input end and output end of the control module (21), respectively. The output end of the control module (21) is electrically connected to the input end of the negative pressure pump (17).

8. The toothpaste cap forming and processing device according to claim 1, characterized in that: The control module (21) controls the working state of the negative pressure pump (17) according to the comparison result in the following steps: the pressure detection module (19) collects the negative pressure value in the airway (10) during the adsorption process; the displacement detection module (20) collects the reset displacement of the ejector pin (14); the control module (21) calculates the adsorption completion coefficient and the demoulding stability coefficient; if the adsorption completion coefficient is less than a set threshold, the negative pressure compensation is started; if the demoulding stability coefficient is less than or equal to the set threshold, the vibration-assisted demoulding is triggered.

9. A toothpaste cap molding method according to any one of claims 1 to 8, characterized in that: The steps include: First, molten plastic is injected into the fixed mold (5) through the injection molding machine (7) through the feed hole (8); Second, after the toothpaste cap is cooled and formed, the negative pressure pump (17) is started to form a negative pressure at the air hole (12) through the air pipe (18), and the ejector pin (14) compresses the spring (15) and then separates from the air hole (12), and the toothpaste cap is adsorbed on the punch (11); Third, when the electric push rod (6) drives the movable mold (4) to reset and demould, the pressure detection module (19) monitors the negative pressure value in the airway (10) in real time and generates an adsorption completion coefficient. If the adsorption completion coefficient is less than a threshold value, the control module (21) starts negative pressure compensation; Fourth, the negative pressure pump (17) is finally turned off, and the ejector pin (14) pushes the toothpaste cap off the punch (11) under the action of the spring (15). The displacement detection module (20) monitors the reset displacement of the ejector pin (14) to generate a demoulding stability coefficient. If the demoulding stability coefficient is less than or equal to a set threshold, vibration-assisted demoulding is triggered.

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