A TPE injection molding process for toothbrush head production

Abstract

The present invention relates to the technical field of toothbrushes, and in particular to a TPE injection molding process for producing toothbrush heads, comprising the following steps: A. inserting the bristles into the holes of a carrier for shaping; B. performing injection molding on the holes of the carrier to form a shaping piece for maintaining the current posture of the bristles; C. driving the top cover of the carrier so that the shaping piece in the hole is exposed to the outside from the top of the carrier; D. removing the shaping piece from the carrier; E. performing TPE injection molding on the shaping piece. The present invention achieves a fixing effect on the bristles while performing injection molding of the shaping piece directly in the carrier, which is conducive to improving production efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of toothbrushes, in particular to a TPE injection molding process for producing toothbrush heads. Background Art

[0002] The brush heads of electric toothbrushes are currently produced using the TPE copper-free injection molding process. The purpose is to make the bristles more flexible and reduce the hardness of the brush heads, thereby reducing harm to the human body.

[0003] However, most existing TPE copper-free injection molding processes use hot melt or ultrasonic welding to fix the bristles to the plastic parts, that is, the fixation of the plastic parts and the bristles formed by one injection molding is performed in two separate actions, resulting in low efficiency. Summary of the invention

[0004] In view of the problems of the prior art, the present invention provides a TPE injection molding process for producing toothbrush heads, and improves efficiency by optimizing the process.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a TPE injection molding process for producing a toothbrush head, comprising the following steps:

[0007] A. Insert the bristles into the holes of the carrier to shape them;

[0008] B. Injection molding is performed on the holes of the carrier to form a molded part for maintaining the current posture of the bristles;

[0009] C. driving the top cover of the carrier so that the shaped part in the hole is exposed to the outside from the top of the carrier;

[0010] D. Remove the molded parts from the carrier;

[0011] E. Perform TPE injection molding on the molded parts.

[0012] Furthermore, the carrier includes a main body and two top covers, the main body has a plurality of holes, the two top covers are respectively provided with a plurality of hair plugging holes, the two top covers are respectively slidably arranged on the main body from both sides of the main body, and the top covers are used to cover the holes so that the holes are connected to the hair plugging holes;

[0013] The hole position is provided with a plurality of step structures corresponding to the insertion hole, and one side of the hole position is connected with an injection channel for external injection molding equipment.

[0014] Furthermore, the carrier is further provided with an ejection module, a rotating member, a cutting member and a control member, the middle part of the rotating member is rotatably arranged in the carrier, the cutting member and the control member are respectively arranged at both ends of the rotating member, and a return member is arranged at the bottom of one end of the rotating member provided with the cutting member; step C specifically includes:

[0015] C1. Drive the top covers to move away from each other;

[0016] C2. During the movement of the top cover, the control member is pressed down to drive the rotating member to rotate and drive the cutting member to rise;

[0017] C3. The cutting piece rises and cuts off the connection between the shaping piece and the nozzle;

[0018] C4. The ejector module moves to drive the molded part to rise, and the rising height is not less than 1 / 3 of the maximum height of the molded part.

[0019] Furthermore, the injection channel is arranged at an angle with the bottom of the carrier, the bottom of the injection channel is connected to the bottom of the hole, and the top side of the multiple injection channels on the same side is connected to the same flow channel, and the flow channel is used for external injection molding equipment;

[0020] During injection molding, the molten plastic flows through the runner and then is distributed to each injection channel. Then, it enters the bottom side of the hole through the injection channel to fill the hole from bottom to top.

[0021] Furthermore, step A specifically includes:

[0022] A1. Insert the bristles into the holes of the carrier;

[0023] A2. driving the carrier to vibrate to adjust the posture of the bristles, the vibration time is t;

[0024] A3. Obtain an image of the bristles through vision, compare the image with the pre-stored image and calculate the deviation value. If the deviation value is within the preset range, execute step B; otherwise, execute steps A2-A3 again until the deviation value reaches the preset range;

[0025] Here, t is a constant and the value range of t is 1-3.

[0026] Furthermore, in step A, in step A3, if the number of times of executing steps A2-A3 reaches 3 times and the deviation value is still greater than the preset range, then execute step A4;

[0027] A4. Obtain three images of the bristles, extract deviation values ​​and analyze them respectively;

[0028] A5. Based on the analysis results, perform one of the following:

[0029] Remove some bristles and repeat step A2;

[0030] Trim some of the bristles and then proceed to step B;

[0031] Execute steps BD and then transfer the molded part to the scrap area.

[0032] Furthermore, in step D, the robot removes the shaped part from the carrier by suction using negative pressure.

[0033] Further, step E specifically includes:

[0034] E1. Transfer the molded parts to the transition carrier;

[0035] E2. Flip the transition carrier so that the molded part on the transition carrier falls into the injection bottom mold;

[0036] E3. Clamp the injection mold and then perform TPE injection molding on the brush head;

[0037] E4. Open the bottom mold and then remove the brush head from the bottom mold.

[0038] Furthermore, a device for performing step E is provided, comprising a turntable mechanism, a flip mechanism and an injection molding mechanism,

[0039] With the rotating axis of the turntable mechanism as the center, a plurality of transitions are distributed in a circular array on the top of the turntable mechanism, and the transition stations are used to accommodate transition carriers;

[0040] The flip mechanism includes a flip driving member, a flipping member, a cover closing driving member and two cover modules. The flip driving member is used to drive the flipping member to flip. Both ends of the flipping member are provided with guide modules, which are used to guide and drive the transition carrier to enter or exit the flipping member. Both cover modules are slidably arranged on the flipping member. The cover closing driving member is used to drive the two cover modules to open or close.

[0041] The injection molding mechanism includes a base, a driving module, two injection bottom molds and two injection top molds. The two injection bottom molds are respectively arranged at the top of both ends of the base. The driving module is used to drive the base to move back and forth. The two injection top molds are respectively arranged corresponding to the two injection bottom molds. A lifting module is arranged between the injection bottom mold and the base.

[0042] When one of the injection bottom molds is injecting, the other injection bottom mold is located at the turning mechanism to receive the material.

[0043] Furthermore, the transition station is provided with a transition drive module for driving the transition carrier to move back and forth;

[0044] The guide module includes a bottom drive module and two limit pressure strips. The bottom drive module is used to drive the transition module to move back and forth. The two limit pressure strips cooperate to press the top two ends of the carrier respectively.

[0045] The cover body module includes two limiting covers, which are arranged one by one with the two limiting pressure strips, and the two limiting covers are used to cover the top of the transition carrier; when the covers are closed, the bristles of the shaping part protrude to the outside through the limiting covers.

[0046] Beneficial effects of the present invention: The present invention achieves a fixation effect on the bristles while injecting and molding the shaped parts directly in the carrier, which is beneficial to improving production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a flow chart of the present invention.

[0048] Figure 2 It is a schematic diagram of the interior of the carrier of the present invention.

[0049] Figure 3 Schematic diagram of the top cover of the present invention

[0050] Figure 4 Schematic diagram of an apparatus for performing step E of the present invention.

[0051] Figure 5 for Figure 4 Schematic diagram of the injection molding mechanism from another perspective.

[0052] Reference numerals:

[0053] 1—carrier, 11—main body, 12—top cover, 13—hole, 14—insertion hole, 15—step structure, 16—ejection module, 17—rotating part, 18—cutting part, 19—control part, 110—return part, 111—flow channel, 112—injection channel;

[0054] 2—turntable mechanism, 21—transition carrier, 22—transition drive module;

[0055] 3—flipping mechanism, 31—flipping drive member, 32—flipping member, 33—cover closing drive member, 34—cover body module, 35—guide module, 36—bottom drive module, 37—limiting pressure strip; 4—injection molding mechanism, 41—base, 42—drive module, 43—injection molding bottom mold, 44—injection molding top mold, 45—lifting module. DETAILED DESCRIPTION

[0056] In order to facilitate the understanding of those skilled in the art, the present invention is further described below in conjunction with the embodiments and drawings, and the contents mentioned in the embodiments are not intended to limit the present invention. The present invention is described in detail below in conjunction with the drawings.

[0057] like Figures 1 to 5 As shown, the present invention provides a TPE injection molding process for producing a toothbrush head, comprising the following steps:

[0058] A. Insert the bristles into the hole 13 of the carrier 1 for shaping;

[0059] B. Injection molding is performed on the hole 13 of the carrier 1 to form a molded part for maintaining the current posture of the bristles;

[0060] C. driving the top cover 12 of the carrier 1 so that the shaped part in the hole 13 is exposed to the outside from the top of the carrier 1;

[0061] D. Remove the molded part from the carrier 1;

[0062] E. Perform TPE injection molding on the molded parts.

[0063] Compared with the prior art, the present invention integrates the positioning (shaping) of the bristles with the injection molding of the shaping parts, that is, the bristles are inserted into the carrier 1 for shaping before injection molding. Specifically, the bristles are passed through the top cover 12 and then accommodated in the hole 13. The structure on the top cover 12 keeps the bristles upright, and then plastic is injected into the hole 13 to form the shaping parts inside the hole 13 and fix the posture of the bristles at the same time. The brush head can be manufactured by subsequent TPE injection molding, thereby reducing the number of process steps and improving efficiency.

[0064] In this embodiment, the carrier 1 includes a main body 11 and two top covers 12. The main body 11 has a plurality of holes 13. The two top covers 12 are respectively provided with a plurality of hair plug holes 14. The two top covers 12 are respectively slidably disposed on the main body 11 from both sides of the main body 11. The top covers 12 are used to cover the holes 13 so that the holes 13 are connected to the hair plug holes 14.

[0065] The hole 13 is provided with a plurality of step structures 15 corresponding to the hair insertion hole 14, and one side of the hole 13 is connected with an injection channel 112 for external injection molding equipment.

[0066] For the carrier 1, the height and shape of the bristles at different positions are different through the distribution of the step structure 15, so that the bristles can be distributed according to the required posture and height; then after the shaping piece is formed, the bristles can maintain the posture, and the effect of maintaining the posture of the bristles can be achieved by omitting the hot melting or welding process. In addition, the carrier 1 is preferably formed with two rows of shaping pieces at one time, and the number of shaping pieces in each row is preferably 4-6; and the top cover 12 can be driven by a linear drive module 42 with a cylinder or a motor as a power source, and each covering hole of the top cover 12 is open on one side, that is, the opening can be sealed by another top cover 12, so that when the two top covers 12 are separated from each other, the bristles can be smoothly avoided and the shaping pieces can be exposed.

[0067] Specifically, the carrier 1 is further provided with an ejection module 16, a rotating member 17, a cutting member 18 and a control member 19. The middle part of the rotating member 17 is rotatably arranged in the carrier 1. The cutting member 18 and the control member 19 are respectively arranged at both ends of the rotating member 17. The bottom of one end of the rotating member 17 where the cutting member 18 is arranged is provided with a return member 110. Step C specifically includes:

[0068] C1. Drive the top cover 12 to move away from each other;

[0069] C2. During the movement of the top cover 12, the control member 19 is pressed down to drive the rotating member 17 to rotate and drive the cutting member 18 to rise;

[0070] C3. The cutting piece 18 rises and cuts off the connection between the shaping piece and the nozzle;

[0071] C4. The ejector module 16 moves to drive the molded part to rise, and the rising height is not less than 1 / 3 of the maximum height of the molded part.

[0072] In actual use, the ejector module 16 is a commonly used structure of the mold and will not be described in detail here; the control member 19 and the top cover 12 are matched through an inclined surface, that is, when the top cover 12 is opened, the inclined surface of the top cover 12 contacts the inclined surface of the control member 19, and as the top cover 12 is opened, the control member 19 will continue to descend, forcing the rotating member 17 to rotate and lift the cutting member 18, thereby achieving the effect of separating the shaping member from the water outlet; when the top cover 12 is closed, it means that the hair needs to be inserted. At this time, the control member 19 is lifted under the action of the return member 110, which is preferably a spring, so that the cutting member 18 descends accordingly, thereby achieving the effect of controlling the lifting and lowering of the cutting member 18 according to the opening and closing of the top cover 12.

[0073] Specifically, the injection channel 112 is arranged at an angle with the bottom of the carrier 1, the bottom of the injection channel 112 is connected to the bottom of the hole 13, and the top side of the multiple injection channels 112 located on the same side is connected to the same flow channel 111, and the flow channel 111 is used for external injection molding equipment;

[0074] During injection molding, the molten plastic flows through the flow channel 111 and is divided into each injection channel 112 , and then enters the bottom side of the hole 13 through the injection channel 112 to fill the hole 13 from bottom to top.

[0075] That is, the injection molding of the shaped part of the present invention is achieved by injecting molten plastic into one side of the bottom of the vacant space, allowing the plastic to rise continuously until it fills the entire hole 13 and then cools, thereby achieving the molding of the shaped part. The advantage of bottom injection molding is that it avoids the influence on the bristles as much as possible.

[0076] Specifically, the carrier 1 is also provided with a heating module and a cooling module. The heating module is preferably an electric heating wire, which is mainly distributed around the injection channel 112; the cooling module is cooled by water cooling, and its water cooling channel is distributed around the empty space. When the top cover 12 is closed, the heating module heats the carrier 1 to preheat the injection channel 112 and the nozzle in the flow channel 111, so that the nozzle can melt in time and enter the empty space during injection molding to avoid blockage; and after the injection molding is completed, the cooling module is switched to work to allow the molded part to cool down and solidify as soon as possible.

[0077] It should be noted that the melting point of the bristles of the present invention is higher than that of the molding part, thereby ensuring that the bristles will not melt or deform during the injection molding process.

[0078] In this embodiment, step A specifically includes:

[0079] A1. Insert the bristles into the hole 13 of the carrier 1;

[0080] A2. driving the carrier 1 to vibrate to adjust the posture of the bristles, the vibration time is t;

[0081] A3. Obtain an image of the bristles through vision, compare the image with the pre-stored image and calculate the deviation value. If the deviation value is within the preset range, execute step B; otherwise, execute steps A2-A3 again until the deviation value reaches the preset range;

[0082] Here, t is a constant and the value range of t is 1-3.

[0083] That is, the bristles are guided by a bristle inserting device (which can be conventional) and then inserted into the hole 13 after passing through the covering hole, and then maintained in this state and vibrated, so that the bristles will continuously adjust their posture under the limitation and vibration of the bristle inserting device, thereby ensuring that each bristle smoothly enters the empty position and remains in an upright state; wherein, the vibration can be achieved by a vibrating screen. After the bristles are inserted and vibrated, visual inspection is performed, and when the bristle deviation value of one of the empty positions is outside the preset range, adjustment is performed again through vibration. In the above process, after the vibration is completed, the bristle inserting device can rise to expose the bristles to the outside world, and when it is necessary to vibrate again, the bristle inserting device can continue to cover the bristles, or it can be left uncovered.

[0084] Specifically, in step A, in step A3, if the number of steps A2-A3 is executed reaches 3 times and the deviation value is still greater than the preset range, step A4 is executed;

[0085] A4. Obtain three images of the bristles, extract deviation values ​​and analyze them respectively;

[0086] A5. Based on the analysis results, perform one of the following:

[0087] Remove some bristles and repeat step A2;

[0088] Trim some of the bristles and then proceed to step B;

[0089] Execute steps BD and then transfer the molded part to the scrap area.

[0090] In actual production, the deviation value of the bristles still cannot meet the requirements after multiple vibrations. The main reasons are that there are too many bristles, some bristles are too long, or the water outlet is not smoothly cut off during the insertion process. Therefore, different methods can be implemented according to different situations:

[0091] When the result is too many bristles, the deviation value shows that some bristles are too high and tilted (the shape of the high position is different after each vibration). At this time, you only need to remove the bristles through a robot or other equipment and re-insert the bristles.

[0092] When the result is that the length of some bristles is too long, the deviation value is that the bristles are too high, but the shape of the high position of the bristles remains basically unchanged after multiple vibrations. At this time, it is only necessary to subtract the excessively long position; the shortened part can be left between the bristles or fall on the top cover 12, and the subsequent process can be processed incidentally;

[0093] When the result is that the bristles are not inserted smoothly, the height of the bristles is not only too high, but also the shape is irregular and the shape changes after each vibration. At this time, just keep the injection molding, and take out the shaped part after forming and transfer it to the waste area for recycling. The probability of this situation is very low, usually caused by failure to eject in time. When it occurs more frequently, timely maintenance is required.

[0094] In addition, in this embodiment, the carrier 1 preferably has a groove, and the top cover 12 slides in the groove. On the one hand, the movement of the top cover 12 can be limited. On the other hand, after injection molding, the top cover 12 can act as an upper mold to push against the molding part to ensure that the shape of the molding part meets the requirements and avoid glue overflow.

[0095] Specifically, in step D, the robot removes the shaped part from the carrier 1 by suction using negative pressure.

[0096] In this embodiment, step E specifically includes:

[0097] E1. The shaped parts are transferred to the transition carrier 21;

[0098] E2. Flip the transition carrier 21 so that the shaped member on the transition carrier 21 falls into the injection bottom mold 43;

[0099] E3. The bottom mold 43 is molded and then the TPE brush head is injection molded;

[0100] E4. Open the bottom mold and then remove the brush head from the bottom mold.

[0101] That is, after the shaped part is formed, it is transferred to the transition carrier 21 by the robot through negative pressure suction, and the holes on the transition carrier 21 are preferably two rows. For ease of understanding, this embodiment provides a device for performing step E, including a turntable mechanism 2, a flip mechanism 3 and an injection mechanism 4.

[0102] With the rotation axis of the turntable mechanism 2 as the center, a plurality of transitions are distributed in a circular array on the top of the turntable mechanism 2, and the transition stations are used to accommodate the transition carrier 21;

[0103] The flip mechanism 3 includes a flip driving member 31, a flip member 32, a cover closing driving member 33 and two cover modules 34. The flip driving member 31 is used to drive the flip member 32 to flip. Both ends of the flip member 32 are provided with guide modules 35, which are used to guide and drive the transition carrier 21 to enter or exit the flip member 32. The two cover modules 34 are both slidably arranged on the flip member 32. The cover closing driving member 33 is used to drive the two cover modules 34 to open or close.

[0104] The injection molding mechanism 4 includes a base 41, a driving module 42, two injection bottom molds 43 and two injection top molds 44. The two injection bottom molds 43 are respectively arranged at the top of both ends of the base 41. The driving module 42 is used to drive the base 41 to move back and forth. The two injection top molds 44 are respectively arranged corresponding to the two injection bottom molds 43. A lifting module 45 is provided between the injection bottom mold 43 and the base 41.

[0105] When one of the injection bottom molds 43 is injecting, the other injection bottom mold 43 is located at the turning mechanism 3 to receive the material.

[0106] That is, in fact, the transition stations are preferably an even number, such as two or four; taking a transition carrier 21 as an example, the transition carrier 21 is arranged at the transition station, and the robot puts the shaped part into the transition carrier 21; when the transition carrier 21 is fully loaded, the turntable mechanism 2 is actuated, so that the transition carrier 21 rotates and reaches the flipping mechanism 3, and then the guide module 35 guides the transition carrier 21 to leave the transition station and enter the guide module 35, and then the cover module 34 covers the transition carrier 21, and the specific covering method can refer to the top cover 12; then the flipping drive member 31 controls the flipping member 32 to flip 180°, and the existence of the cover module 34 ensures that the shaped part is turned over. During the rotation, the transition carrier 21 will not separate from the transition carrier 21. Then, when the transition carrier 21 is flipped 180°, it is located directly above an injection bottom mold 43. At this time, the cover module 34 is opened, and the molding part separates from the transition carrier 21 and falls into the injection bottom mold 43, thereby achieving the effect of flipping the molding part; then the driving module 42 drives the base 41 to move, so that the injection bottom mold 43 with the molding part leaves, and at the same time, the other injection bottom mold 43 moves to the bottom of the flip part 32, waiting for the next action of the flip part 32; and the bottom mold that leaves is closed and TPE injection molded through its corresponding injection top mold 44, thereby realizing the top-down molding of the brush head, which is convenient for subsequent removal.

[0107] It should be noted that the two cover modules 34 are driven by the same cover-closing driving member 33 and can be opened or closed simultaneously by conventional means such as a gear rack, a gear module, etc., making the structure of the present invention more compact.

[0108] Specifically, the transition station is provided with a transition drive module 22 for driving the transition carrier 21 to move back and forth. The transition drive module 22 is preferably a conveyor belt module, which is used to cooperate with the guide module 35 to realize the stable transmission of the transition carrier 21.

[0109] Specifically, the guide module 35 includes a bottom driving module 36 and two limiting pressure strips 37. The bottom driving module 36 is used to drive the transition module to move back and forth, and the two limiting pressure strips 37 cooperate to respectively hold the top two ends of the carrier 1. The bottom driving module 36 is also preferably a crawler module or a conveyor belt module. The limiting pressure strip 37 is preferably movably arranged on the flip member 32. Before flipping, the transition carrier 21 is clamped by descending the limiting pressure strip 37 to ensure that the transition carrier 21 will not be displaced relative to the flip member 32 during the flipping process.

[0110] Specifically, the cover body module 34 includes two limit covers, which are arranged one by one with two limit pressure strips 37, and the two limit covers cooperate to cover the top of the transition carrier 21; when the cover is closed, the bristles of the shaping piece protrude to the outside through the limit covers. The limit covers are driven by the cover closing drive member 33 only when the transition carrier 21 is in place, so as to play a similar effect to the top cover 12, but the difference is that the shaping piece is partially exposed to the outside in the transition carrier 21, so the limit covers can actually hold or clamp the shaping piece. If it is clamped, the structure of the corresponding groove can refer to the covering hole of the top cover 12. Since the injection bottom mold 43 is driven by the lifting module 45 to lift and lower, the distance between the injection bottom mold 43 and the transition carrier 21 can be reduced as much as possible, and it can be lowered and moved after being connected to the shaping piece, so as to achieve the avoidance effect.

[0111] Of course, after the injection mold 43 receives the molded parts that fall into the injection mold 43 due to gravity, the injection mold 43 can be vibrated to ensure that each molded part falls reliably into the corresponding position of the injection mold 43 to ensure the safety and quality of the TPE injection molding operation.

[0112] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention is disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments according to the technology of the present invention are all within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.

Claims

1. A TPE injection molding process for producing toothbrush heads, characterized in that: The following steps are involved: A. Insert the bristles into the holes of the carrier to shape them; B. Injection molding is performed on the holes of the carrier to form a molded part for maintaining the current posture of the bristles; C. driving the top cover of the carrier so that the shaped part in the hole is exposed to the outside from the top of the carrier; D. Remove the molded parts from the carrier; E. Perform TPE injection molding on the shaped parts; Step A specifically includes: A1. Insert the bristles into the holes of the carrier; A2. driving the carrier to vibrate to adjust the posture of the bristles, the vibration time is t; A3. Obtain an image of the bristles through vision, compare the image with the pre-stored image and calculate the deviation value. If the deviation value is within the preset range, execute step B; otherwise, execute steps A2-A3 again until the deviation value reaches the preset range; Wherein, t is a constant and the value range of t is 1-3; In step A3, if the number of steps A2-A3 is 3 and the deviation value is still greater than the preset range, step A4 is executed; A4. Obtain three images of the bristles, extract deviation values ​​and analyze them respectively; A5. Based on the analysis results, perform one of the following: Remove some bristles and repeat step A2; Trim some of the bristles and then proceed to step B; Execute steps BD, and then transfer the shaped part to a waste area; The carrier comprises a main body and two top covers, wherein the main body has a plurality of holes, and the two top covers are respectively provided with a plurality of hair plugging holes, and the two top covers are respectively slidably arranged on the main body from both sides of the main body, and the top covers are used to cover the holes so that the holes are connected with the hair plugging holes; the holes are provided with a plurality of step structures corresponding to the hair plugging holes, and one side of the holes is connected with an injection channel for an external injection molding device; the carrier is also provided with an ejection module, a rotating part, a cutting part and a control part, the middle part of the rotating part is rotatably arranged in the carrier, the cutting part and the control part are respectively arranged at both ends of the rotating part, and a return part is arranged at the bottom of one end of the rotating part provided with the cutting part; step C specifically comprises: C1. Drive the top covers to move away from each other; C2. During the movement of the top cover, the control member is pressed down to drive the rotating member to rotate and drive the cutting member to rise; C3. The cutting piece rises and cuts off the connection between the shaping piece and the nozzle; C4. The ejector module moves to drive the molded part to rise, and the rising height is not less than 1 / 3 of the maximum height of the molded part.

2. The TPE injection molding process for producing toothbrush heads according to claim 1, characterized in that: The injection channel is arranged at an angle with the bottom of the carrier, the bottom of the injection channel is connected to the bottom of the hole, and the top side of multiple injection channels located on the same side is connected to the same flow channel, and the flow channel is used for external injection molding equipment; During injection molding, the molten plastic flows through the runner and then is distributed to each injection channel. Then, it enters the bottom side of the hole through the injection channel to fill the hole from bottom to top.

3. The TPE injection molding process for producing toothbrush heads according to claim 1, characterized in that: In step D, the robot removes the molded part from the carrier by suction using negative pressure.

4. The TPE injection molding process for producing toothbrush heads according to claim 1, characterized in that: Step E specifically includes: E1. Transfer the molded parts to the transition carrier; E2. Flip the transition carrier so that the molded part on the transition carrier falls into the injection bottom mold; E3. Clamp the injection mold and then perform TPE injection molding on the brush head; E4. Open the bottom mold and then remove the brush head from the bottom mold.

5. The TPE injection molding process for producing toothbrush heads according to claim 3, characterized in that: Providing a device for performing step E, including a turntable mechanism, a flip mechanism and an injection molding mechanism, With the rotating axis of the turntable mechanism as the center, a plurality of transitions are distributed in a circular array on the top of the turntable mechanism, and the transition stations are used to accommodate transition carriers; The flip mechanism includes a flip driving member, a flipping member, a cover closing driving member and two cover modules. The flip driving member is used to drive the flipping member to flip. Guide modules are respectively provided at both ends of the flipping member. The guide modules are used to guide and drive the transition carrier to enter or exit the flipping member. Both cover modules are slidably arranged on the flipping member. The cover closing driving member is used to drive the two cover modules to open or close. The injection molding mechanism includes a base, a driving module, two injection molding bottom molds and two injection molding top molds. The two injection molding bottom molds are respectively arranged at the top of both ends of the base. The driving module is used to drive the base to move back and forth. The two injection molding top molds are respectively arranged corresponding to the two injection molding bottom molds. A lifting module is provided between the injection molding bottom mold and the base. When one of the injection bottom molds is injecting, the other injection bottom mold is located at the turning mechanism to receive the material.

6. The TPE injection molding process for producing a toothbrush head according to claim 5, characterized in that: The transition station is provided with a transition drive module for driving the transition carrier to move back and forth; The guide module includes a bottom drive module and two limit pressure strips. The bottom drive module is used to drive the transition module to move back and forth. The two limit pressure strips cooperate to press the top two ends of the carrier respectively. The cover body module includes two limiting covers, which are arranged one by one with the two limiting pressure strips, and the two limiting covers are used to cover the top of the transition carrier; when the covers are closed, the bristles of the shaping part protrude to the outside through the limiting covers.

Images