An injection mold for automotive lamp housings

Abstract

This invention belongs to the field of mold technology, specifically a car lamp housing injection mold, including a fixed mold and a moving mold for use. The fixed mold is provided with an ejector plate, and the mold also includes: a self-adjusting part, including a mounting part movably inserted into the main support member; a fastening part, including a fastening plate slidably mounted on the fixed mold; a control part, including an adjusting plate slidably mounted on the fixed mold; and a transmission part. By adjusting the extension length of the mounting part on the main support member, the position of the ejector plate can be adjusted, so that the ends of each ejector plate are flush, and the pushing force provided by the ejector plate to the lamp housing is consistent, thereby ensuring that the lamp housing can be ejected smoothly. By setting up a control component and a drive assembly, the heat energy during the temperature rise during injection molding is used as a power source. After injection molding is completed and the mold cools down, the ejector plate position correction and fixing work is automatically performed sequentially. The degree of automation is high, no additional electric drive mechanism is required, and the operating cost is low.

Description

Technical Field

[0001] This invention belongs to the field of molds, specifically an injection mold for automotive lamp housings. Background Technology

[0002] Automotive lamp housings are mostly manufactured using injection molding. The process involves injecting the molding material into the mold cavity for shaping. After the mold cools down, it is opened, and the lamp housing is ejected from the mold by an ejection mechanism. A commonly used hydraulic ejection mechanism generally consists of an ejector plate, a reset rod, and an ejection fixing plate. The ejector plate acts directly on the product to remove it from the injection mold, while the ejection fixing plate mainly serves to block the ejector plate. The ejector plate needs to provide a relatively stable and consistent pushing force to the lamp housing to successfully eject it. For lamp housings with a large aspect ratio, the requirements for the ejection mechanism are even higher. If the forces at different contact points between the ejector plate and the lamp housing are different, the lamp housing is more likely to deflect or get stuck in the mold.

[0003] A patent application with publication number CN215619652U discloses an injection mold for a taillight housing with a large aspect ratio, including an upper injection mold and a lower injection mold. Because the molded plastic part has a large aspect ratio, after injection molding, an ejector assembly with a large aspect ratio is used to assist in molding the plastic part. A large-area, multi-point synchronous ejection method is employed to uniformly eject the plastic part, preventing deflection or jamming.

[0004] However, the above technical solutions still have some problems. The ends of the ejector plates are in direct contact with the lamp housing, and after long-term operation, they are prone to wear. This can lead to unevenness between the ends of the ejector plates when they contact the lamp housing, resulting in different pushing forces from the ejector plates onto the lamp housing. Lamp housings with large aspect ratios are prone to getting stuck in the mold. In addition, the ejector plates in the ejection mechanism are mounted on hydraulic rods and other driving devices. Poor installation and fitting accuracy or loosening during use can also cause unevenness between the ends of the ejector plates. Therefore, it is necessary to automatically correct the position of the ejector plates in a timely manner. The above solutions have not effectively solved this problem.

[0005] Therefore, the present invention provides an injection mold for automotive lamp housings. Summary of the Invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by this invention to solve its technical problem is as follows: An injection mold for an automotive lamp housing, comprising a fixed mold and a moving mold used in conjunction, wherein the fixed mold is provided with a plurality of ejector plates for ejecting the lamp housing and ejector fixing plates for blocking the ejector plates, and further comprising:

[0008] The self-adjusting part includes a main support member fixed to the fixed mold, an installation member is movably inserted into the main support member, and the ejector plate is installed on the installation member;

[0009] The fastening part includes a fastening plate that is slidably mounted on the fixed mold, the fastening plate positioning the mounting part on the main support member;

[0010] A control unit, comprising an adjusting plate slidably mounted on the fixed mold, the adjusting plate driving the fastening plate away from the mounting member; and

[0011] The transmission part includes a temperature-changing component disposed on the fixed mold, and a pressure plate is mounted on the temperature-changing component. After the temperature-changing component is deformed by heat, it pushes the adjustment plate through the pressure plate.

[0012] Specifically, the fixed mold is fixedly mounted on the injection molding machine, and the movable mold is movably mounted on the injection molding machine. After the movable mold and the fixed mold come together and close, the lamp housing is injected into the cavity between them. After injection molding, the mold is cooled, and then the movable mold is separated from the fixed mold. Then, the lamp housing is ejected from the fixed mold by the ejector plate. The fixed mold is provided with a support. The self-adjusting part, fastening part, control part, and transmission part are preferably, but not limited to, located inside the support. Before injection molding, the ejector plate blocks the ejector plate. After the adjusting plate is loosened, the fastening plate becomes movable. After the fastening plate is loosened, the mounting part becomes movable. The position of the ejector plate is adjusted by adjusting the extension length of the mounting parts. When all the ejector plates abut against the ejection fixing plate, it means that the ends of all the ejector plates are flush. Then, the mounting parts are fixed to the main support by the fastening plate, so that the ejector plates maintain a stable position. In this way, the ejector plate is corrected. The ejector plates with flush ends exert a consistent ejection force on the lamp housing, thus ensuring that the lamp housing can be smoothly ejected from the mold. During the injection molding process, the adjusting plate holds the fastening plate in place, thereby improving the stability of the fit between the ejector plate and the mounting parts.

[0013] Preferably, the fastening part further includes: a first pushing member that pushes the fastening plate against the mounting member; a positioning hole on the main support member corresponding to the fastening plate; and a second pushing member that pushes the mounting member away from the main support member;

[0014] The fastening plate passes through the positioning hole and abuts against the mounting member under the push of the first pusher.

[0015] Specifically, the first and second pushing components are preferably, but not limited to, springs. In the initial state, the second pushing component is in a compressed state. After the fastening plate is released, the mounting component moves away from the main support component under the push of the second pushing component, thereby causing the ejector plate to move outward and abut against the ejector fixing plate, thus automatically correcting the position of the ejector plate and keeping the end of the ejector plate flush. Then, the fastening plate moves downward under the push of the first pushing component and locks the mounting component, so that the mounting component and the main support component remain in a relatively fixed position, thereby improving the installation stability of the ejector plate.

[0016] Preferably, the control unit further includes: a control seat disposed inside the support; a transverse plate slidably disposed inside the control seat, the transverse plate driving the adjusting plate to slide laterally; a first reset member pushing the transverse plate to move toward the fastening plate; a control member separating the transverse plate from the fastening plate; and a second reset member pushing the adjusting plate to slide longitudinally.

[0017] The adjusting plate is engaged with the fastening plate.

[0018] Preferably, the control seat is located above the main support member. The first and second reset members are preferably, but not limited to, springs. The fastening plate, adjusting plate, and transverse plate are all slidably mounted on the control seat. The adjusting plate can slide in both the longitudinal and transverse directions. One installation method is as follows: the control seat is provided with a guide rod that can slide up and down. The adjusting plate is mounted on the guide rod and can slide laterally. The adjusting plate is slidably connected to the transverse plate. The side of the adjusting plate near the fastening plate is provided with a toothed section. The fastening plate is provided with a locking tooth that mates with the toothed section. The movement direction of the transverse plate is perpendicular to the movement direction of the adjusting plate so as to stably lock the adjusting plate.

[0019] Preferably, the control element includes: a rotating plate rotatably disposed within the control base; a groove disposed within the transverse plate; and a wedge disposed at the bottom of the rotating plate and inserted into the groove.

[0020] Specifically, in the initial state, the rotating plate is in a horizontal position, the wedge is inserted into the groove, the horizontal moving plate drives the adjusting plate to separate from the fastening plate, after the rotating plate rotates clockwise, the wedge separates from the groove, and the horizontal moving plate moves to the left under the push of the first reset component, so that the adjusting plate and the fastening plate are engaged, thereby fixing the fastening plate.

[0021] Preferably, the transmission unit further includes: a triggering component for controlling the deflection state of the rotating plate; and a driving component for driving the triggering component.

[0022] Specifically, the temperature-sensitive component has a structure that deforms and recovers with temperature changes. During injection molding, the mold temperature rises, the temperature-sensitive component deforms and drives the rotating plate to deflect, causing the wedge to separate from the transverse plate. The transverse plate then holds the adjusting plate in place, thus keeping the fastening plate in a fixed position. When injection molding ends and the lamp housing is removed after the mold cools down, the mold temperature drops to a stable range, the temperature-sensitive component resets, the rotating plate rotates, and the wedge drives the transverse plate away from the adjusting plate. Then the fastening plate can be loosened, thereby correcting the position of the mounting part and the ejector plate.

[0023] Preferably, the triggering component includes: a ball movably placed within the control seat; and a groove provided within the control seat for the ball to circulate in one direction.

[0024] The rotating plate is inserted into the interior of the groove on the side away from the transverse plate; the rotating plate is provided with a damping element to reduce its rotational speed.

[0025] Specifically, as the ball circulates in the groove, it continuously impacts the rotating plate, causing the plate to tilt. By setting a damping element to slow down the rotation speed of the plate, the time required for the damping element to return to a horizontal state is greater than the interval between two impacts of the ball on the plate. Therefore, as the ball continues to roll, the plate remains tilted. Only when the ball has been stationary for a long time does the plate return to a horizontal state.

[0026] Preferably, the trough includes: an ascending trough, the ball resting at the bottom of the ascending trough; a descending trough; the top and bottom of the descending trough are both inclined, the top inlet of the descending trough is lower than the top of the ascending trough, and the bottom outlet of the descending trough is higher than the bottom of the ascending trough; and a baffle provided at the junction of the bottom of the descending trough and the ascending trough, the baffle being a unidirectional rotating structure.

[0027] Specifically, after the ball rolls to the top of the rising trough, it automatically slides into the falling trough under the action of inertia and gravity, pushes open the baffle, and rolls to the bottom of the rising trough.

[0028] Preferably, the driving assembly includes: a turntable that rotates on the fixed mold; and levers evenly distributed on the outer side of the turntable for propelling the ball to roll in the groove.

[0029] The temperature-sensitive element and the turntable engage in a unidirectional transmission.

[0030] Specifically, the turntable is mounted inside the support. During the rotation of the turntable, the ball is continuously propelled by the lever to roll unidirectionally within the groove.

[0031] Preferably, the rising groove is an arc shape concentric with the turntable, and the inside of the control seat is provided with a through groove for the movement of the lever, the width of the through groove being smaller than the outer diameter of the ball.

[0032] Specifically, this design prevents the balls from falling out of the groove.

[0033] Preferably, the temperature-sensitive component includes: a bimetallic strip assembly disposed on the fixed mold; and a lifting plate disposed at the bottom of the bimetallic strip assembly, the lifting plate being connected to the pressure plate;

[0034] The turntable is equipped with gears, and the lifting plate is equipped with ratchet teeth that mesh with the gears for transmission.

[0035] Specifically, after the lifting plate moves down, the adjusting plate is pressed down by the pressure plate, and the lifting plate forms a one-way rotating structure through ratchet and gear.

[0036] The beneficial effects of this invention are as follows:

[0037] 1. The automotive lamp housing injection mold of the present invention assembles the ejector plate in the mold onto the self-adjusting part with adjustable length. By adjusting the extension length of the mounting part on the main support part, the position of the ejector plate can be adjusted so that the ends of each ejector plate are flush and the pushing force provided by the ejector plate to the lamp housing is consistent. This ensures that the lamp housing can be smoothly ejected from the mold, improving the problem that the pushing force on the lamp housing changes due to wear at the end of the ejector plate and positional offset, which makes it difficult to eject the lamp housing.

[0038] 2. The automotive lamp housing injection mold of the present invention, by setting a fastening plate and an adjusting plate, when correcting the position of the ejector plate, the adjusting plate loosens the fastening plate to adjust the ejector plate; after correction, the fastening plate fixes the ejector plate to the mounting part, and the adjusting plate locks the fastening plate in place. By setting multiple fastening structures, the installation position stability of the ejector plate during the injection molding process is improved.

[0039] 3. The automotive lamp housing injection mold of the present invention, by setting control components and drive components, uses the heat energy when the temperature rises during the injection process as a power source. The temperature-changing component converts the heat energy into mechanical energy. After the injection is completed and the mold is cooled, the ejector plate position is automatically corrected and fixed in sequence. It has a high degree of automation, does not require an additional electric drive mechanism, and has low operating costs.

[0040] 4. The automotive lamp housing injection mold of the present invention, by setting a trigger component, during the injection process, when the temperature changes, the rotating plate remains tilted, and the adjusting plate locks the fastening plate, further improving the installation stability of the ejector plate; after the injection is completed, when the mold temperature cools to a stable range, the rotating plate turns to horizontal, the adjusting plate loosens the fastening plate, and the mounting part automatically adjusts its position. In this way, the function of automatically correcting the position of the ejector plate after each injection is realized. Attached Figure Description

[0041] The invention will now be further described with reference to the accompanying drawings.

[0042] Figure 1 This is a perspective view of Embodiment 1 of the present invention;

[0043] Figure 2 This is a cross-sectional view of the internal structure of the mold of the present invention;

[0044] Figure 3 This is a schematic diagram of the self-adjustment unit and the control unit;

[0045] Figure 4 This is a sectional view of the self-adjusting section, control section, and transmission section;

[0046] Figure 5 yes Figure 4 Enlarged view of a portion of point A in the middle;

[0047] Figure 6 This is an exploded view of the fasteners, turntable, and pressure plate;

[0048] Figure 7 This is a schematic diagram of the connection structure between the temperature-sensitive component and the turntable;

[0049] Figure 8 This is a half-section view of the rotating plate and the roller groove.

[0050] In the diagram: 1. Fixed mold; 11. Ejector plate; 12. Ejector fixing plate; 13. Support; 2. Moving mold; 3. Self-adjusting part; 31. Main support component; 32. Mounting component; 4. Fastening part; 41. Fastening plate; 411. Clamping tooth; 42. First pushing component; 43. Positioning hole; 44. Second pushing component; 5. Control part; 51. Adjusting plate; 52. Control seat; 521. Through slot; 53. Transverse plate; 54. First reset component; 55. Control component; 5 51. Rotating plate; 552. Groove; 553. Wedge; 56. Second reset component; 6. Transmission unit; 61. Pressure plate; 62. Temperature-sensitive component; 621. Bimetallic strip assembly; 622. Lifting plate; 6221. Ratchet; 63. Trigger assembly; 631. Ball; 632. Groove; 6321. Rising groove; 6322. Falling groove; 6323. Baffle; 64. Drive assembly; 641. Turntable; 6411. Gear; 642. Lever. Detailed Implementation

[0051] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0052] Example 1

[0053] like Figure 1-4As shown in the embodiment of the present invention, an injection mold for an automotive lamp housing includes a fixed mold 1 and a moving mold 2 for use in conjunction. The fixed mold 1 is provided with a plurality of ejector plates 11 for ejecting the lamp housing and ejector fixing plates 12 for blocking the ejector plates 11. It also includes: a self-adjusting part 3, a fastening part 4, a control part 5, and a transmission part 6, wherein:

[0054] The self-adjusting part 3 includes a main support member 31 fixed to the fixed mold 1, and an installation member 32 is movably inserted into the main support member 31. The ejector plate 11 is installed on the installation member 32. The fastening part 4 includes a fastening plate 41 slidably installed on the fixed mold 1. The fastening plate 41 positions the installation member 32 on the main support member 31. The control part 5 includes an adjusting plate 51 slidably installed on the fixed mold 1. The adjusting plate 51 drives the fastening plate 41 away from the installation member 32. The transmission part 6 includes a temperature-changing member 62 provided on the fixed mold 1. A pressure plate 61 is installed on the temperature-changing member 62. After the temperature-changing member 62 is deformed by heat, it pushes the adjusting plate 51 through the pressure plate 61.

[0055] Specifically, the fixed mold 1 is fixedly installed on the injection molding machine, and the movable mold 2 is movably installed on the injection molding machine. After the movable mold 2 and the fixed mold 1 close together, the lamp housing is injected into the cavity between them. After injection molding, the mold is cooled, and then the movable mold 2 is started to separate from the fixed mold 1. Then, the lamp housing is ejected from the fixed mold 1 by the ejector plate 11. The fixed mold 1 is provided with a support 13. The self-adjusting part 3, the fastening part 4, the control part 5, and the transmission part 6 are preferably, but not limited to, located inside the support 13. Before injection molding, the ejector fixing plate 12 blocks the ejector plate 11. The temperature-sensitive component 62 is preferably, but not limited to, a bimetallic strip structure. During operation, the adjusting plate 51 is first loosened, so that the fastening plate 41 becomes movable, and then the fastening plate 41 is loosened. This makes the mounting part 32 movable. The position of the ejector plate 11 can be adjusted by adjusting the extension length of the mounting part 32. When all the ejector plates 11 are against the ejection fixing plate 12, it means that the ends of all the ejector plates 11 are flush. Then, the mounting part 32 is fixed to the main support part 31 by the fastening plate 41, so that the ejector plate 11 keeps its position stable. In this way, the function of correcting the ejector plate 11 is realized. The ejector plates 11 with flush ends exert a consistent ejection force on the lamp housing, thereby ensuring that the lamp housing can be smoothly ejected from the mold. During the injection molding process, the adjusting plate 51 locks the fastening plate 41, thereby improving the stability of the fit between the ejector plate 11 and the mounting part 32.

[0056] like Figure 4-5As shown, the fastening part 4 further includes: a first pushing member 42 that pushes the fastening plate 41 against the mounting member 32; a positioning hole 43 on the main support member 31 corresponding to the fastening plate 41; and a second pushing member 44 that pushes the mounting member 32 away from the main support member 31; the fastening plate 41 passes through the positioning hole 43 and abuts against the mounting member 32 under the pushing of the first pushing member 42.

[0057] Specifically, the first pusher 42 and the second pusher 44 are preferably, but not limited to, springs. In the initial state, the second pusher 44 is in a compressed state. After the fastening plate 41 is released, the mounting member 32 moves away from the main support member 31 under the push of the second pusher 44, thereby causing the ejector plate 11 to move outward and abut against the ejector fixing plate 12, thereby automatically correcting the position of the ejector plate 11 and keeping the end of the ejector plate 11 flush. Then, the fastening plate 41 moves downward under the push of the first pusher 42 and locks the mounting member 32, so that the mounting member 32 and the main support member 31 remain in a relatively fixed position, thereby improving the installation stability of the ejector plate 11.

[0058] like Figure 5-6 As shown, the control unit 5 further includes: a control seat 52 disposed inside the support 13; a transverse plate 53 slidably disposed inside the control seat 52, the transverse plate 53 driving the adjusting plate 51 to slide laterally; a first reset member 54 pushing the transverse plate 53 to move toward the fastening plate 41; a control member 55 separating the transverse plate 53 from the fastening plate 41; and a second reset member 56 pushing the adjusting plate 51 to slide longitudinally; the adjusting plate 51 is engaged with the fastening plate 41.

[0059] Specifically, with Figure 5 For example, the main support 31 moves laterally, the fastening plate 41 moves longitudinally, and the moving direction of the fastening plate 41 is preferably, but not limited to, perpendicular to the main support 31. The moving direction of the transverse plate 53 is preferably, but not limited to, perpendicular to the fastening plate 41. The control seat 52 is located above the main support 31. The first reset member 54 and the second reset member 56 are preferably, but not limited to, springs. The fastening plate 41, the adjusting plate 51, and the transverse plate 53 are all slidably mounted on the control seat 52. The adjusting plate 51 can slide in both longitudinal and transverse directions. One installation method is as follows: the control seat 52 is provided with a guide rod that can slide up and down. The adjusting plate 51 is mounted on the guide rod and can slide laterally. The adjusting plate 51 is slidably connected to the transverse plate 53. The side of the adjusting plate 51 near the fastening plate 41 is provided with a toothed section. The fastening plate 41 is provided with a locking tooth 411 that cooperates with the toothed section. By setting the moving direction of the transverse plate 53 to be perpendicular to the moving direction of the adjusting plate 51, the adjusting plate 51 can be stably locked.

[0060] like Figure 4-6As shown, the control element 55 includes: a rotating plate 551 rotatably disposed within the control base 52; a groove 552 disposed within the transverse plate 53; and a wedge 553 disposed at the bottom of the rotating plate 551 and inserted into the groove 552.

[0061] Specifically, the initial state is as follows: Figure 4 As shown, at this time, the rotating plate 551 is in a horizontal state, which can be achieved by setting a torsion spring on the rotating plate 551. The wedge 553 on the left is inserted into the groove 552. The horizontal moving plate 53 drives the adjusting plate 51 to separate from the fastening plate 41. After the rotating plate 551 rotates clockwise, the wedge 553 separates from the groove 552. The horizontal moving plate 53 moves to the left under the push of the first reset member 54, so that the adjusting plate 51 and the fastening plate 41 are engaged, thereby fixing the fastening plate 41.

[0062] like Figure 3-8 As shown, the transmission unit 6 further includes: a trigger assembly 63 for controlling the deflection state of the rotating plate 551; and a drive assembly 64 for driving the trigger assembly 63, wherein: the trigger assembly 63 includes: a ball 631 movably placed in the control seat 52; and a groove 632 provided in the control seat 52 for the ball 631 to circulate in one direction; the side of the rotating plate 551 away from the transverse plate 53 is inserted into the interior of the groove 632; and the rotating plate 551 is provided with a damping element for reducing its rotational speed.

[0063] The trough 632 includes: an ascending trough 6321, to which the ball 631 rests at the bottom; a descending trough 6322, wherein the top and bottom of the descending trough 6322 are both inclined, the top inlet of the descending trough 6322 is lower than the top of the ascending trough 6321, and the bottom outlet of the descending trough 6322 is higher than the bottom of the ascending trough 6321; and a baffle 6323 disposed at the junction of the bottom of the descending trough 6322 and the ascending trough 6321, wherein the baffle 6323 is a unidirectional rotating structure.

[0064] Specifically, the temperature-sensitive component 62 has a structure that can deform and recover with temperature changes. During the injection molding process, the mold temperature rises, the temperature-sensitive component 62 deforms and drives the rotating plate 551 to deflect, causing the wedge block 553 to separate from the transverse plate 53. The transverse plate 53 then holds the adjusting plate 51 in place, thereby keeping the fastening plate 41 in a fixed position. When the injection molding is completed and the lamp housing is removed after the mold cools down, the mold temperature drops to a stable range, the temperature-sensitive component 62 resets, the rotating plate 551 rotates, and the wedge block 553 drives the transverse plate 53 away from the adjusting plate 51. Then the fastening plate 41 can be loosened, thereby correcting the position of the mounting component 32 and the ejector plate 11.

[0065] As the ball 631 circulates in the groove 632, it continuously impacts the rotating plate 551, causing the rotating plate 551 to tilt. By setting a damping element to slow down the rotation speed of the rotating plate 551, the time required for the damping element to return to a horizontal state is greater than the interval between two impacts of the ball 631 on the rotating plate 551. Therefore, as the ball 631 continues to roll, the rotating plate 551 remains tilted. Only when the ball 631 has been stationary for a long time will the rotating plate 551 return to a horizontal state.

[0066] After the ball 631 rolls to the top of the rising groove 6321, it automatically slides into the falling groove 6322 under the action of inertia and gravity, pushes open the baffle 6323 and rolls to the bottom of the rising groove 6321.

[0067] like Figure 6 As shown, the drive assembly 64 includes: a turntable 641 rotatably mounted on the fixed mold 1; and levers 642 evenly distributed on the outer side of the turntable 641 for propelling the rolling ball 631 to roll in the rolling groove 632; the temperature-sensitive element 62 and the turntable 641 perform unidirectional transmission in an engaging manner.

[0068] Specifically, the turntable 641 is rotatably installed in the support 13. During the rotation of the turntable 641, the lever 642 continuously moves the ball 631 to roll unidirectionally in the groove 632.

[0069] like Figure 8 As shown, the rising groove 6321 is an arc shape concentric with the turntable 641, and the inside of the control seat 52 is provided with a through groove 521 for the movement of the lever 642. The width of the through groove 521 is smaller than the outer diameter of the ball 631.

[0070] Specifically, this design prevents the ball 631 from falling out of the groove 632.

[0071] Example 2

[0072] like Figure 6-7 As shown in the comparative embodiment one, another embodiment of the present invention is as follows: the temperature-changing component 62 includes: a bimetallic strip assembly 621 disposed on the fixed mold 1; and a lifting plate 622 disposed at the bottom of the bimetallic strip assembly 621, the lifting plate 622 being connected to the pressure plate 61; a gear 6411 is provided on the turntable 641, and a ratchet 6221 is provided on the lifting plate 622 for meshing and transmitting with the gear 6411.

[0073] Specifically, after the lifting plate 622 moves downward, it presses the adjusting plate 51 downward through the pressure plate 61. The lifting plate 622 forms a unidirectional rotation structure with the ratchet 6221 and the gear 6411. According to the calculation formula of the bending deflection of the bimetallic strip after heating: In the formula: yt K represents the bending deflection of the bimetallic strip after heating. k Let K be the specific bending decrease coefficient, l be the bimetallic strip length, Δθ be the bimetallic strip temperature rise, and δ be the bimetallic strip thickness. It can be seen that a specific bending coefficient of 21.1*10 is used. -6 ℃ -1 The bimetallic strip material is 200mm long and 10mm thick. When the temperature rises to 200℃, the bending deflection of the bimetallic strip is 150mm, which can provide sufficient displacement for pushing the lifting plate 622. Depending on the specific situation, the bimetallic strip assembly 621 can also adopt the bimetallic strip structure used to push the valve core in the bimetallic strip steam trap.

[0074] Working principle: In the initial state, the adjusting plate 51 is separated from the fastening plate 41. During the injection molding process, the mold heats up, the bimetallic strip assembly 621 deforms due to heat, and drives the lifting plate 622 to move downward. The downward-moving lifting plate 622 presses the adjusting plate 51 downward through the pressure plate 61. At the same time, the lifting plate 622 drives the gear 6411 and the turntable 641 to rotate. The lever 642 continuously moves the ball 631 to roll in the groove 632. The ball 631 hits the rotating plate 551, causing the rotating plate 551 to always tilt. The wedge 553 separates from the transverse plate 53, and the transverse movement... Plate 53 moves to the left under the action of the first reset member 54, causing the adjusting plate 51 to engage with the fastening plate 41, thus locking the adjusting plate 51 in place. The fastening plate 41 keeps the position fixed, which allows the mounting member 32 to remain fixed on the main support member 31, thereby improving the installation stability of the ejector plate 11 during injection molding. After injection molding is completed and the lamp housing is removed, the ejector fixing plate 12 blocks the ejector plate 11 again, the mold cools down and remains stable, the bimetallic strip assembly 621 recovers its deformation, and drives the lifting plate 622 and the pressure plate 61 to move upward and reset. After moving upward, the lifting plate 622... Without rotating the turntable 641 and lever 642, after the ball 631 has been stationary at the bottom of the groove for a long time, the rotating plate 551 rotates back to a horizontal state and drives the transverse plate 53 to separate from the adjusting plate 51 through the wedge block 553. Before the rotating plate 551 rotates to a horizontal state, the adjusting plate 51 is engaged with the fastening plate 41 through the locking teeth 411. As the pressure plate 61 moves upward, the adjusting plate 51 also moves upward to reset, and drives the fastening plate 41 to move upward, making the mounting part 32 movable. Under the push of the second pusher 44, the mounting part 32 moves away from the main support. The ejector plate 11 moves outward and abuts against the ejector fixing plate 12, regardless of whether the ejector plate 11 is worn. The end of the ejector plate 11 abuts against the ejector fixing plate 12, thereby completing the function of automatically correcting the position of the ejector plate 11 and ensuring that the ejector plate 11 exerts a consistent ejection force on the subsequent lamp housing, thus ensuring the smooth ejection of the lamp housing. This correction process is performed automatically after each injection molding, without manual operation. It has a simple structure, a high degree of automation, and does not require an additional electric drive device, resulting in low operating costs.

[0075] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An injection mold for an automotive lamp housing, comprising a fixed mold (1) and a moving mold (2) for use in conjunction, wherein the fixed mold (1) is provided with a plurality of ejector plates (11) for ejecting the lamp housing, characterized in that: Also includes: The self-adjusting part (3) includes a main support member (31) fixed to the fixed mold (1), and an installation member (32) is movably inserted into the main support member (31). The ejector plate (11) is installed on the installation member (32). The fastening part (4) includes a fastening plate (41) slidably mounted on the fixed mold (1), the fastening plate (41) positioning the mounting part (32) on the main support (31); it also includes: a first pusher (42) that pushes the fastening plate (41) against the mounting part (32), a positioning hole (43) on the main support (31) corresponding to the fastening plate (41), and a second pusher (44) that pushes the mounting part (32) away from the main support (31), the fastening plate (41) passing through the positioning hole (43) and against the mounting part (32) under the push of the first pusher (42); Control unit (5), the control unit (5) including an adjusting plate (51) slidably mounted on the fixed mold (1), the adjusting plate (51) driving the fastening plate (41) away from the mounting member (32); and The transmission part (6) includes a temperature-changing element (62) provided on the fixed mold (1). A pressure plate (61) is installed on the temperature-changing element (62). After the temperature-changing element (62) is deformed by heat, it pushes the adjusting plate (51) through the pressure plate (61).

2. The automotive lamp housing injection mold according to claim 1, characterized in that: The control unit (5) also includes: A control seat (52) is provided on the fixed mold (1); A sliding plate (53) is slidably disposed within the control base (52), and the sliding plate (53) drives the adjusting plate (51) to slide laterally; A first reset member (54) that pushes the transverse plate (53) toward the fastening plate (41); A control (55) that separates the transverse plate (53) from the fastening plate (41); and The second reset member (56) pushes the adjusting plate (51) to slide longitudinally; The adjusting plate (51) is engaged with the fastening plate (41).

3. The automotive lamp housing injection mold according to claim 2, characterized in that: The control element (55) includes: Rotate the turntable (551) located inside the control base (52); A groove (552) provided inside the transverse plate (53); and A wedge (553) is provided at the bottom of the rotating plate (551) and inserted into the groove (552).

4. The automotive lamp housing injection mold according to claim 3, characterized in that: The transmission unit (6) further includes: a trigger assembly (63) for controlling the deflection state of the rotating plate (551); and A driving component (64) for driving the trigger component (63).

5. The automotive lamp housing injection mold according to claim 4, characterized in that: The triggering component (63) includes: The ball (631) is placed within the control seat (52); and A groove (632) is provided in the control seat (52) for the ball (631) to circulate in one direction; The rotating plate (551) is inserted into the interior of the groove (632) on the side away from the transverse plate (53); the rotating plate (551) is provided with a damping element for reducing its rotational speed.

6. The automotive lamp housing injection mold according to claim 5, characterized in that: The groove (632) includes: A rising trough (6321), the ball (631) resting at the bottom of the rising trough (6321); a falling trough (6322); the top and bottom of the falling trough (6322) are both inclined, the top inlet of the falling trough (6322) is lower than the top of the rising trough (6321), and the bottom outlet of the falling trough (6322) is higher than the bottom of the rising trough (6321); and A baffle (6323) is provided at the junction of the bottom of the drop groove (6322) and the rise groove (6321), and the baffle (6323) is a one-way rotating structure.

7. The automotive lamp housing injection mold according to claim 6, characterized in that: The driving component (64) includes: Rotate the turntable (641) mounted on the fixed mold (1); and levers (642) evenly distributed on the outer side of the turntable (641) for moving the rolling ball (631); The temperature-sensitive element (62) and the turntable (641) engage in a unidirectional transmission.

8. The automotive lamp housing injection mold according to claim 7, characterized in that: The rising groove (6321) is an arc shape concentric with the turntable (641). The control seat (52) is provided with a through groove (521) for the movement of the lever (642). The width of the through groove (521) is smaller than the outer diameter of the ball (631).

9. The automotive lamp housing injection mold according to claim 7, characterized in that: The temperature-sensitive component (62) includes: a bimetallic strip assembly (621) disposed on the fixed mold (1); and A lifting plate (622) is provided at the bottom of the bimetallic strip assembly (621), and the lifting plate (622) is connected to the pressure plate (61); The turntable (641) is provided with a gear (6411), and the lifting plate (622) is provided with a ratchet (6221) that meshes with the gear (6411).

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