Automobile light guide strip injection device and injection method

Abstract

The application relates to the technical field of injection molding devices, in particular to an automobile light guide strip injection molding device and an injection molding method. The automobile light guide strip injection molding device comprises a movable mold, a fixed mold, a pneumatic device and a plurality of push mechanisms. A mold cavity is defined between the movable mold and the fixed mold, and the mold cavity is used for forming a light guide strip with a plurality of light guide teeth. The pneumatic device can make the pushed light guide strip and the light guide teeth thereon separate from the movable mold. The automobile light guide strip injection molding device can reduce the damage to the light guide strip by controlling the number of top blocks pushed at a time. The follow-up of the top block and the light guide strip is used to make the gas flow to the side of the light guide strip which is relatively not separated from the movable mold, and the exhaust port exhausts air at the connection between the movable mold and the light guide strip, so that the pressure required for demolding between the top block and the light guide strip is reduced, and the damage to the light guide strip in the demolding process is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of injection molding devices, in particular to an injection molding device and method for automobile light guide strips. BACKGROUND

[0002] The light guide strip car lamp is a new type of car lamp more advanced than the LED array car lamp, and the optical principle of the atmosphere lamp light guide strip is mainly refraction, reflection and total reflection of light. When light is conducted in the light guide strip, part of the light can flow out of the surface of the light guide strip through refraction, and part of the light can be conducted inside the light guide strip through total reflection. The main work of optical design is to create some geometric features on the light guide strip to break the total reflection of light, so that the light flows out from a specific position and direction, and finally illuminates the target area. The design of the light guide strip is not only beautiful and practical, but also energy-saving and environmentally friendly.

[0003] The light guide strip is mainly produced by injection molding, and the injection molding quality of the light guide teeth on the light guide strip directly affects the light shape and intensity of the car lamp. The common demolding method of the light guide strip mainly uses ejector pins, but due to the fact that the light guide strip is relatively long and thin and the light guide teeth of the light guide strip are relatively dense, the engagement force with the mold is large, making demolding difficult. Therefore, more ejector pins are needed to eject the light guide strip, but using more ejector pins can easily leave marks on the light guide teeth, and in severe cases, the light guide teeth can be damaged and deformed, affecting the light shape and intensity. SUMMARY

[0004] The present application provides an injection molding device and method for automobile light guide strips to solve the problem that the existing injection molding device uses more ejector pins to eject the light guide strip, which can easily leave marks on the light guide teeth, even damage the light guide teeth and cause deformation, affecting the light shape and intensity.

[0005] The application provides an automobile light guide strip injection molding device, which adopts the following technical scheme: an automobile light guide strip injection molding device, comprising a movable mold, a fixed mold, a pneumatic device and a plurality of pushing mechanisms; the fixed mold is fixedly arranged, the movable mold can move towards or away from the fixed mold, the direction in which the movable mold moves towards or away from the fixed mold is referred to as a first direction, a mold cavity is defined between the movable mold and the fixed mold, and the mold cavity is used for forming a light guide strip with a plurality of light guide teeth; the plurality of pushing mechanisms are arranged on the movable mold in a second direction in sequence, the second direction is perpendicular to the first direction, the pushing mechanism comprises a top block, the initial top block is horizontally arranged and in contact with the light guide strip, the pneumatic device can drive the top block to move along the first direction relative to the movable mold, so that the pushed light guide strip and the light guide teeth thereon are separated from the movable mold, and then the part of the light guide strip pushed in the second direction is inclined relative to the part of the light guide strip not pushed; the top block can be synchronously inclined with the light guide strip arranged correspondingly, and the number of top blocks pushed at a time is less than or equal to three; the two sides of the top block in the second direction are provided with exhaust ports, the pneumatic device can exhaust air to the connection between the movable mold and the light guide strip through the exhaust ports, and the initial two exhaust ports are closed, and when the top block is synchronously inclined with the light guide strip arranged correspondingly, the exhaust port close to the side of the light guide strip not separated from the movable mold can be opened.

[0006] Further, the pushing mechanism further comprises a top rod and two telescopic rods, the top rod is a hollow structure, the pneumatic device can provide a high-pressure gas source to the inside of the top rod, the top block is rotatably mounted on the top rod in a third direction, and the third direction is perpendicular to the first direction and the second direction; the two telescopic rods are slidably mounted in the top rod along the first direction, a first elastic member is arranged between each telescopic rod and the top rod, the two telescopic rods are arranged side by side in the second direction and are rotatably connected to the two ends of the top block respectively; the two exhaust ports are arranged on the two telescopic rods respectively, the initial top block is in contact with the two exhaust ports to limit the exhaust of the exhaust ports, and when the top block is synchronously inclined with the light guide strip arranged correspondingly, the exhaust port close to the side of the light guide strip not separated from the movable mold can be opened.

[0007] Further, the plurality of top rods are connected with the pneumatic device through air pipes respectively, and a gas valve is arranged between each top rod and the air pipe arranged correspondingly, so that when the gas valve is opened, the pneumatic device can provide a high-pressure gas source to the inside of the top rod.

[0008] Further, the top block and the top rod are connected through a torsional spring, so that the top block can be rotatably mounted on the top rod in the third direction.

[0009] Further, the exhaust ports include a plurality of first air holes and a plurality of second air holes, the plurality of first air holes are sequentially arranged on the end face of the telescopic rod close to the top block along the third direction, and the plurality of second air holes are sequentially arranged on the mutually faraway side faces of the telescopic rod along the third direction; each first air hole is in communication with a second air hole; the initial top block is in contact with the first air holes of the two exhaust ports, and the first air holes are blocked; when the top block is synchronously inclined with the light guide strip arranged correspondingly, the contact position of the top block and the telescopic rod will have an inclination angle, so that the first air holes of the exhaust port close to the side of the light guide strip which is not separated from the movable mold are opened.

[0010] The application further provides an injection molding method of the automobile light guide strip injection molding device, comprising the automobile light guide strip injection molding device and the following steps.

[0011] S100, simultaneously starting the pushing mechanisms located on both sides of the light guide strip, and making the top block move along the first direction by a distance of 1 / 3 of the height of the light guide tooth;

[0012] S200, obtaining the included angle a of the top block at the two pushing positions relative to the horizontal state;

[0013] S300, calculating the positions X1 and X2 of the disengagement points of the light guide strip on both sides along the second direction and away from the movable mold;

[0014] S400, obtaining the positions of the pushing mechanisms on both sides of X1 and X2, taking the middle position of the light guide strip as a reference, calling the pushing mechanism relatively close to the middle position of the light guide strip as A1 mechanism and the other pushing mechanism as B1 mechanism among the two pushing mechanisms on both sides of X1, and calculating the distances between X1 and A1 mechanism and B1 mechanism respectively; calling the pushing mechanism relatively close to the middle position of the light guide strip as A2 mechanism and the other pushing mechanism as B2 mechanism among the two pushing mechanisms on both sides of X2; and calculating the distances between X2 and A2 mechanism and B2 mechanism respectively;

[0015] S500, judging whether the distance between the disengagement point X1 and A1 mechanism is greater than 1 / 2 of the distance between A1 mechanism and B1 mechanism, if the distance between the disengagement point X1 and A1 mechanism is greater than 1 / 2 of the distance between A1 mechanism and B1 mechanism, then the B1 mechanism is started next time, if the distance between the disengagement point X1 and A1 mechanism is less than or equal to 1 / 2 of the distance between A1 mechanism and B1 mechanism, then the A1 mechanism is started next time; judging whether the distance between the disengagement point X2 and A2 mechanism is greater than 1 / 2 of the distance between A2 mechanism and B2 mechanism, if the distance between the disengagement point X2 and A2 mechanism is greater than 1 / 2 of the distance between A2 mechanism and B2 mechanism, then the B2 mechanism is started next time, if the distance between the disengagement point X2 and A2 mechanism is less than or equal to 1 / 2 of the distance between A2 mechanism and B2 mechanism, then the A2 mechanism is started next time;

[0016] S600, repeating steps S200-S500 until the light guide bar is completely separated from the movable mold.

[0017] Further, two simultaneously started pushing mechanisms are called a pushing group, and the previous pushing group is retracted after the next pushing group is pushed out.

[0018] Further, in S500, it is judged whether the distance between the separation point X1 and the A1 mechanism is greater than 1 / 3 of the distance between the A1 mechanism and the B1 mechanism, and whether the distance between the separation point X2 and the A2 mechanism is greater than 1 / 3 of the distance between the A2 mechanism and the B2 mechanism.

[0019] Further, after S500 and before S600, it further includes:

[0020] S510, obtaining the number of remaining pushing mechanisms;

[0021] S520, simultaneously starting three pushing mechanisms when the number of pushing mechanisms is less than or equal to three.

[0022] Further, the number of pushing mechanisms is set to be odd.

[0023] The beneficial effects of the present application are: the automobile light guide bar injection molding device of the present application is provided with a movable mold, a fixed mold, a pneumatic device and a plurality of pushing mechanisms, when the light guide bar is injection molded in the mold cavity, the pneumatic device is started to drive the pushing block and the light guide bar corresponding to the pushing block to move, and then the light guide bar corresponding to the upper end of each pushing block moves along the first direction to the side close to the fixed mold, so that the pushed light guide bar is separated from the movable mold, and is inclined in the second direction relative to the light guide bar not pushed, by controlling the number of pushing blocks pushed at a time, the damage to the light guide bar can be reduced, and when the pushing block separates the light guide bar from the movable mold, the exhaust port is opened by using the follow-up of the pushing block and the light guide bar, so that the exhaust direction of the exhaust port is always towards the side of the light guide bar not separated from the movable mold, the effective flow of gas is realized, so that no matter which position of the light guide bar is pushed, the gas can flow to the side of the light guide bar relatively not separated from the movable mold, and the exhaust port exhausts to the connection between the movable mold and the light guide bar, the cooling speed of the light guide bar and the light guide teeth is accelerated, the negative pressure effect between the movable mold and the pushing block in the process of promoting the light guide bar to separate from the mold by the pneumatic device is reduced, and then the pressure required for the separation between the pushing block and the light guide bar is reduced, and the damage to the light guide bar in the separation process is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only need to be some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0025] Figure 1 It is an overall structure schematic diagram of an embodiment of the automobile light guide strip injection molding device of the present application.

[0026] Figure 2 It is a side view of the overall structure of an embodiment of the automobile light guide strip injection molding device of the present application.

[0027] Figure 3 It is a sectional view along A-A in Figure 2

[0028] Figure 4 It is an enlarged view of X in Figure 3

[0029] Figure 5 It is a top block rotating with the light guide strip state schematic diagram of an embodiment of the automobile light guide strip injection molding device of the present application.

[0030] Figure 6 It is an enlarged view of Y in Figure 5

[0031] Figure 7 It is an exploded view of the pushing mechanism of an embodiment of the automobile light guide strip injection molding device of the present application.

[0032] Figure 8 It is an enlarged view of Z in Figure 7

[0033] Figure 9 It is a connecting structure schematic diagram of the top rod and the air pipe of an embodiment of the automobile light guide strip injection molding device of the present application.

[0034] Figure 10 It is a sectional view along B-B in Figure 9

[0035] In the figure: 110, moving die; 120, fixed die; 200, pneumatic device; 300, mold cavity; 400, ejector rod; 401, telescopic groove; 403, air pipe; 500, telescopic rod; 501, first air hole; 502, second air hole; 600, top block. DETAILED DESCRIPTION

[0036] ​​​​​Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present application.

[0037] An embodiment of the automobile light guide strip injection molding device of the present application is shown in Figures 1 to 10 .

[0038] An automobile light guide strip injection molding device includes a movable mold 110, a fixed mold 120, a pneumatic device 200, and a plurality of pushing mechanisms. The fixed mold 120 is fixedly arranged, and the movable mold 110 can move towards or away from the fixed mold 120 for mold opening or closing operation. The direction in which the movable mold 110 moves towards or away from the fixed mold 120 is referred to as a first direction. As shown in Figure 3 , the first direction is the vertical direction. When the movable mold 110 and the fixed mold 120 are closed, a mold cavity 300 is defined between the movable mold 110 and the fixed mold 120, and the mold cavity 300 is used to form a light guide strip having a plurality of light guide teeth. The light guide strip in the mold cavity is arranged along a second direction, and a plurality of pushing mechanisms are arranged in sequence on the movable mold 110 along the second direction. The second direction is perpendicular to the first direction, as shown in Figure 3 , the second direction is the horizontal direction.

[0039] The pushing mechanism includes a top block 600. The initial top block 600 is horizontally arranged and in contact with the light guide strip. The pneumatic device 200 can drive the top block 600 to move relative to the movable mold 110 along the first direction, so that the pushed light guide strip and the light guide teeth thereon are separated from the movable mold 110, and then the part of the light guide strip that is pushed is inclined relative to the part of the light guide strip that is not pushed in the second direction. The top block 600 can be inclined synchronously with the light guide strip arranged correspondingly, and the number of top blocks 600 pushed at a time is less than or equal to three. The top block 600 has exhaust ports on both sides along the second direction, and the pneumatic device 200 can exhaust air to the connection between the movable mold 110 and the light guide strip through the exhaust ports. The initial two exhaust ports are closed, and when the top block 600 is inclined synchronously with the light guide strip arranged correspondingly, the exhaust port close to the side of the light guide strip that is not separated from the movable mold 110 can be opened.

[0040] Further, the distance that the top block 600 moves along the first direction is 1 / 3 of the height of the light guide teeth. That is, in the plurality of pushing mechanisms, the pneumatic device 200 pushes the top block 600 to move along the first direction by 1 / 3 of the height of the light guide teeth, so that the light guide strip and the light guide teeth thereon can be separated from the movable mold 110, and the light guide strip can be controlled within the elastic deformation range, without affecting the molding quality of the light guide strip.

[0041] The embodiment is characterized in that the movable die 110, the fixed die 120, the pneumatic device 200 and the plurality of pushing mechanisms are cooperated, when the light guide strips are injection molded in the mold cavity 300, the pneumatic device 200 is started, the driving block 600 is driven to move with the light guide strips arranged correspondingly, then the light guide strips arranged correspondingly on the upper end of each driving block 600 move to the side close to the fixed die 120 along the first direction, the pushed light guide strips and the light guide teeth thereon are separated from the movable die 110, and are inclined in the second direction relative to the light guide strips not pushed, the damage to the light guide strips can be reduced by controlling the number of the driving blocks 600 pushed at one time, when the driving block 600 separates the light guide strips from the movable die 110, the exhaust port is opened by the following of the driving block 600 and the light guide strips, the exhaust direction of the exhaust port is always towards the side of the light guide strips not separated from the movable die 110, the gas flows effectively, the gas flows to the side of the light guide strips not separated from the movable die 110 no matter which position of the light guide strips is pushed, the exhaust port exhausts to the connection between the movable die 110 and the light guide strips, the cooling speed of the light guide strips and the light guide teeth is accelerated, the negative pressure effect between the driving block 600 and the light guide strips in the process of demolding is reduced, then the pressure required for demolding between the driving block 600 and the light guide strips is reduced, and the damage to the light guide strips in the demolding process is avoided.

[0042] In the embodiment, the pushing mechanism further comprises the top rod 400 and the two telescopic rods 500, the top rod 400 is a hollow structure, the plurality of top rods 400 are connected with the pneumatic device 200 through the air pipes 403 respectively, and an air valve is arranged between each top rod 400 and the air pipe 403 arranged correspondingly, the automobile light guide strip injection device has a control system, the air valve is connected with the control system of the automobile light guide strip injection device, so that the pneumatic device 200 can provide a high-pressure gas source to the inside of the top rod 400 when the air valve is opened, and the driving block 600 is rotatably installed on the top rod 400 to block one end of the top rod 400, and the third direction is perpendicular to the first direction and the second direction.

[0043] The two telescopic rods 500 are slidably installed in the top rod 400 along the first direction, a first elastic member is arranged between each telescopic rod 500 and the top rod 400, the first elastic member is a first spring, and the two telescopic rods 500 are arranged side by side in the second direction and are rotatably connected with the two ends of the driving block 600 respectively. The two exhaust ports are arranged on the two telescopic rods 500 respectively, the initial driving block 600 contacts the two exhaust ports to block the two exhaust ports and limit the exhaust of the exhaust ports, and when the driving block 600 inclines synchronously with the light guide strips arranged correspondingly, the exhaust port close to the side of the light guide strips not separated from the movable die 110 can be opened.

[0044] Specifically, the top block 600 is connected with the top rod 400 through a torsion spring, so that the top block 600 is rotatably mounted on the top rod 400 in the third direction. The exhaust port includes a plurality of first air holes 501 and a plurality of second air holes 502, the plurality of first air holes 501 are sequentially arranged on the end face of the telescopic rod 500 close to the top block 600 in the third direction, and the plurality of second air holes 502 are sequentially arranged on the mutually far apart side faces of the telescopic rod 500 in the third direction. Each first air hole 501 is in communication with a second air hole 502. The initial top block 600 is in contact with the first air holes 501 of the two exhaust ports, blocks the first air holes 501, limits the exhaust of the exhaust port, and when the top block 600 synchronously tilts with the light guide strip arranged correspondingly, the contact position of the top block 600 with the telescopic rod 500 will have an inclination angle, so that the first air holes 501 of the exhaust port close to the side of the light guide strip that has not been separated from the movable mold 110 are opened. Two telescopic grooves 401 are formed on the top rod 400, and the two telescopic rods 500 are respectively installed in the two telescopic grooves 401 through the first elastic members.

[0045] In use, when the pneumatic device 200 pushes the top block 600 along the first direction through the top rod 400, the top block 600 will synchronously push the light guide strip arranged correspondingly along the first direction, so that the light guide strip can be separated from the movable mold 110, and the light guide strip separated from the movable mold 110 is inclined in the second direction relative to the light guide strip that has not been pushed. At this time, the top block 600 rotates in the third direction, and the torsion spring is charged. That is, the top block 600 and the light guide strip arranged correspondingly synchronously act in the second direction, and the inclination of the top block 600 will make the two telescopic rods 500 connected with the top block 600 act, that is, one of the telescopic rods 500 compresses the first elastic member arranged correspondingly in the top rod 400, so that the contact position of the top block 600 with the telescopic rod 500 has an inclination angle, and the first air holes 501 of the exhaust port on the side of the light guide strip that has not been separated from the movable mold 110 are opened. Referring to the drawings Figure 6 So that the gas can flow through the first air holes 501 to the second air holes 502 and then flow to the side of the light guide strip that has not been separated from the movable mold 110. The first air holes 501 of the exhaust port on the side of the light guide strip that has been separated from the movable mold 110 are still in contact with the top block 600, that is, the exhaust port on the other side is still closed and cannot exhaust. That is, the cooperation of the telescopic rod 500 and the first elastic member and the like in the embodiment realizes the follow-up of the top block 600 and the light guide strip, and further opens the first air holes 501 of the exhaust port on the side of the light guide strip that has not been separated from the movable mold 110, adjusts the direction of gas outflow to the side of the light guide strip that has not been separated from the movable mold 110, realizes the effective flow of the gas, so that no matter which position of the top block 600 is driven to move along the first direction, the gas can be deviated to the side of the light guide strip that has not been separated from the movable mold 110.

[0046] The application further provides an embodiment of an injection molding method of the automobile light guide strip injection molding device.

[0047] The injection molding method of the automobile light guide strip injection molding device adopts the automobile light guide strip injection molding device and further includes the following steps:

[0048] S100, simultaneously starting the push mechanisms on both sides of the light guide strip, and moving the push blocks 600 in the first direction by 1 / 3 of the height of the light guide teeth; that is, among the plurality of push mechanisms, during use, the push mechanisms on both sides of the light guide strip are simultaneously started by the pneumatic device, and the push blocks 600 are pushed to move in the first direction by 1 / 3 of the height of the light guide teeth, so that the light guide strip and the light guide teeth thereon can be separated from the moving die 110, and the light guide strip can be controlled within the elastic deformation range, without affecting the forming quality of the light guide strip.

[0049] S200, obtaining the included angle a of the push blocks 600 at the two push positions relative to the horizontal state; specifically, an angle sensor is arranged on the push block 600, for sensing the angle a of the push block 600 relative to the horizontal state.

[0050] S300, calculating the positions X1 and X2 of the disengagement points of the light guide strip on both sides in the second direction from the moving die 110;

[0051] Given the length L of the light guide strip in the second direction and 1 / 3 of the height L1 of the light guide teeth in the first direction, it is known that the distance from the intersection position X1 of the disengagement of the light guide strip on one side in the second direction from the moving die 110 to the distance L2=L1 / tan a of the end of the light guide strip being pushed up. Further, the position of X1 can be determined. The calculation method of X2 is the same as that of X1, and will not be described in detail here.

[0052] S400, obtaining the positions of the push mechanisms on both sides of X1 and X2, taking the middle position of the light guide strip as a reference, referring to the push mechanism relatively close to the middle position of the light guide strip as A1 mechanism, and referring to the other push mechanism as B1 mechanism, and calculating the distances between X1 and A1 mechanism and B1 mechanism, respectively; referring to the push mechanism relatively close to the middle position of the light guide strip as A2 mechanism, and referring to the other push mechanism as B2 mechanism, and calculating the distances between X2 and A2 mechanism and B2 mechanism, respectively;

[0053] S500, determine whether the distance between the disengagement point X1 and the A1 mechanism is greater than 1 / 2 of the distance between the A1 mechanism and the B1 mechanism, if the distance between the disengagement point X1 and the A1 mechanism is greater than 1 / 2 of the distance between the A1 mechanism and the B1 mechanism, then the next time the B1 mechanism is started, if the distance between the disengagement point X1 and the A1 mechanism is less than or equal to 1 / 2 of the distance between the A1 mechanism and the B1 mechanism, then the next time the A1 mechanism is started; determine whether the distance between the disengagement point X2 and the A2 mechanism is greater than 1 / 2 of the distance between the A2 mechanism and the B2 mechanism, if the distance between the disengagement point X2 and the A2 mechanism is greater than 1 / 2 of the distance between the A2 mechanism and the B2 mechanism, then the next time the B2 mechanism is started, if the distance between the disengagement point X2 and the A2 mechanism is less than or equal to 1 / 2 of the distance between the A2 mechanism and the B2 mechanism, then the next time the A2 mechanism is started.

[0054] Taking the disengagement point X1 as an example, the A1 mechanism is a pushing mechanism close to the middle position of the light guide strip, that is, after starting the pushing mechanisms located on both sides of the light guide strip, the pushing mechanisms on both sides will push the light guide strip corresponding to them through the top block 600, so that the light guide strip is disengaged from the moving die 110 and inclined relative to the light guide strip on the side that has not been disengaged from the moving die 110. Therefore, it can be known that the A1 mechanism is closer to the light guide strip on the side that has not been disengaged from the moving die 110, and the B1 mechanism is located on the side closer to the light guide strip that has been disengaged relative to the A1 mechanism. Since the amount of pushing the light guide strip to disengage by each pushing mechanism is uncertain, in order to more accurately adjust the amount of pushing of the pushing mechanism and avoid unnecessary damage to the light guide strip caused by pushing, when in use, the distance from the A1 mechanism to the X1 point is determined, and then the pushing mechanism closer to the X1 is started next time. That is, if the distance between the disengagement point X1 and the A1 mechanism is greater than 1 / 2 of the distance between the A1 mechanism and the B1 mechanism, then the B1 mechanism is started next time, to prevent starting the A1 mechanism and not being able to better push out the light guide strip on the side closer to the B1 mechanism, thereby causing the stress on the light guide strip to increase. If the distance between the disengagement point X1 and the A1 mechanism is less than or equal to 1 / 2 of the distance between the A1 mechanism and the B1 mechanism, then the A1 mechanism is started next time, to improve the accuracy of pushing.

[0055] As a preferred, in S500, it is determined whether the distance between the disengagement point X1 and the A1 mechanism is greater than 1 / 3 of the distance between the A1 mechanism and the B1 mechanism, and whether the distance between the disengagement point X2 and the A2 mechanism is greater than 1 / 3 of the distance between the A2 mechanism and the B2 mechanism. By changing the proportion of the distance between the disengagement point X1 and the A1 mechanism to the distance between the A1 mechanism and the B1 mechanism, the pushing mechanism for the light guide strip is more accurately controlled.

[0056] S600, repeat steps S200-S500 until the light guide strip is completely disengaged from the moving die 110.

[0057] Further, two simultaneously started pushing mechanisms are called a pushing group, and the previous pushing group is retracted after the next pushing group is pushed out, so as to avoid the previous pushing group from being retracted in advance, which may cause the light guide bar to return.

[0058] In another possible embodiment, after S500 and before S600, the method further comprises:

[0059] S510, obtaining the number of remaining pushing mechanisms;

[0060] S520, simultaneously starting three pushing mechanisms when the number of pushing mechanisms corresponding to the light guide bars that have not been separated is less than or equal to three.

[0061] When the number of pushing mechanisms corresponding to the light guide bars that have not been separated is less than or equal to three, in order to ensure that all the light guide bars are completely separated, the remaining pushing mechanisms can be simultaneously started.

[0062] In another possible embodiment, after S510 and before S520, the method further comprises:

[0063] S511, determining whether the number of remaining pushing mechanisms is less than five;

[0064] S512, simultaneously starting the A1 mechanism or the B1 mechanism and the A2 mechanism or the B2 mechanism when the number of remaining pushing mechanisms is four.

[0065] S513, determining whether the light guide bars are completely separated, if the light guide bars are completely separated, stopping, if the light guide bars are not completely separated, calculating the specific positions of two separation points X1 and X2, and determining whether there is a pushing mechanism below the light guide bars that have not been separated, if there is a pushing mechanism below the light guide bars that have not been separated, the pushing mechanism works, if there is no pushing mechanism below the light guide bars that have not been separated, calculating the distance between the separation points X1 and X2 and the remaining two pushing mechanisms, selecting the pushing mechanism closest to X1 or X2, and completing the final pushing action.

[0066] Preferably, the number of pushing mechanisms is set to be odd, which can make two pushing mechanisms be pushed at a time under normal circumstances, and three pushing mechanisms can be left when the last group of pushing mechanisms is pushed, so that the three pushing mechanisms can work at the same time to reduce the stress on the light guide bar and avoid deformation of the light guide bar.

[0067] The above only describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An injection molding device for automotive light guide strips, characterized in that: The system includes a moving mold, a fixed mold, a pneumatic device, and multiple ejector mechanisms. The fixed mold is fixedly installed, while the moving mold can move towards or away from the fixed mold. This direction of movement is referred to as the first direction. A mold cavity is defined between the moving mold and the fixed mold, and the cavity is used to form a light guide strip with several light-guiding teeth. Multiple ejector mechanisms are sequentially arranged on the moving mold along a second direction, which is perpendicular to the first direction. Each ejector mechanism includes an ejector block. Initially, the ejector block is horizontally positioned and in contact with the light guide strip. The pneumatic device drives the ejector block to move relative to the moving mold along the first direction, causing the ejected light guide strip and its light-guiding teeth to disengage from the moving mold. This causes the ejected portion of the light guide strip to tilt relative to the un-ejected portion in the second direction. The ejector block can... The top blocks are tilted synchronously with the corresponding light guide strips, and the number of top blocks pushed at a time is less than or equal to three. Each top block has an exhaust port on both sides along the second direction. The pneumatic device can exhaust air to the connection between the moving mold and the light guide strip through the exhaust ports. Initially, both exhaust ports are closed. The pushing mechanism also includes a top rod and two telescopic rods. The top rod has a hollow structure. The pneumatic device can provide a high-pressure air source to the inside of the top rod. The top block can be rotatably mounted on the top rod around a third direction. The third direction is perpendicular to both the first and second directions. Both telescopic rods can be slidably mounted inside the top rod along the first direction. Each telescopic rod is provided with a first elastic element between it and the top rod. The two telescopic rods are arranged side by side in the second direction and are rotatably connected to both ends of the top block. Two vents are respectively set on two telescopic rods. The initial top block contacts the two vents, restricting the vents from escaping. When the top block tilts synchronously with the light guide strip it is set with, the vent near the side of the light guide strip that has not been separated from the moving mold can be opened. The top block and the top rod are connected by a torsion spring, so that the top block can be rotatably mounted on the top rod around a third direction.

2. The automotive light guide strip injection molding device according to claim 1, characterized in that: Multiple push rods are connected to a pneumatic device via air pipes, and each push rod is equipped with an air valve between it and its corresponding air pipe, so that when the air valve is opened, the pneumatic device can provide a high-pressure air source to the push rod.

3. The automotive light guide strip injection molding device according to claim 1, characterized in that: The vent includes multiple first air holes and multiple second air holes. The multiple first air holes are arranged sequentially along a third direction on the end face of the telescopic rod near the top block, and the multiple second air holes are arranged sequentially along a third direction on the mutually distant sides of the telescopic rod. Each first air hole is connected to one second air hole. Initially, the top block contacts the first air holes of the two vents, blocking the first air holes. When the top block tilts synchronously with the corresponding light guide strip, an angle will appear at the contact position between the top block and the telescopic rod, causing the first air hole of the vent near the side of the light guide strip that has not detached from the moving mold to open.

4. An injection molding method for an automotive light guide strip injection molding device, characterized in that: The automotive light guide injection molding apparatus as described in any one of claims 1 to 3 further includes the following steps: S100, simultaneously activate the push mechanism located on both sides of the light guide strip, and move the top block along the first direction by a distance equal to 1 / 3 of the height of the light guide tooth; S200, obtain the angle α between the top blocks at the two pushing positions and the horizontal state; S300, calculate the locations of the separation points X1 and X2 on both sides of the light guide strip along the second direction from the moving mold; S400: Obtain the positions of the pushing mechanisms on both sides of X1 and X2. Taking the middle position of the light guide strip as a reference, the pushing mechanism relatively closer to the middle position of the light guide strip on both sides of X1 is called mechanism A1, and the other pushing mechanism is called mechanism B1. Calculate the distances between X1 and mechanism A1 and mechanism B1 respectively. Similarly, the pushing mechanism relatively closer to the middle position of the light guide strip on both sides of X2 is called mechanism A2, and the other pushing mechanism is called mechanism B2. Calculate the distances between X2 and mechanism A2 and mechanism B2 respectively. S500: Determine whether the distance between the disengagement point X1 and mechanism A1 is greater than 1 / 2 of the distance between mechanism A1 and mechanism B1. If the distance between the disengagement point X1 and mechanism A1 is greater than 1 / 2 of the distance between mechanism A1 and mechanism B1, then mechanism B1 will be started next. If the distance between the disengagement point X1 and mechanism A1 is less than or equal to 1 / 2 of the distance between mechanism A1 and mechanism B1, then mechanism A1 will be started next. Determine whether the distance between the disengagement point X2 and mechanism A2 is greater than 1 / 2 of the distance between mechanism A2 and mechanism B2. If the distance between the disengagement point X2 and mechanism A2 is greater than 1 / 2 of the distance between mechanism A2 and mechanism B2, then mechanism B2 will be started next. If the distance between the disengagement point X2 and mechanism A2 is less than or equal to 1 / 2 of the distance between mechanism A2 and mechanism B2, then mechanism A2 will be started next. S600, repeat steps S200-S500 until the light guide strip is completely separated from the moving mold.

5. The injection molding method for an automotive light guide strip injection molding device according to claim 4, characterized in that: Two jacking mechanisms that start simultaneously are called a jacking group. The previous jacking group is retracted after the next jacking group pushes out.

6. The injection molding method for an automotive light guide strip injection molding device according to claim 5, characterized in that: In S500, it is determined whether the distance between the disengagement point X1 and mechanism A1 is greater than 1 / 3 of the distance between mechanism A1 and mechanism B1, and whether the distance between the disengagement point X2 and mechanism A2 is greater than 1 / 3 of the distance between mechanism A2 and mechanism B2.

7. The injection molding method for an automotive light guide strip injection molding device according to claim 6, characterized in that: The series that follows S500 and precedes S600 includes: S510, obtain the number of remaining jacking mechanisms; S520: When the number of jacking mechanisms is less than or equal to three, all three jacking mechanisms are activated simultaneously.

8. The injection molding method for an automotive light guide strip injection molding device according to claim 7, characterized in that: The number of jacking mechanisms is set to an odd number.

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