A stress relief constant temperature uniform pressure shaping device for a car lamp cover

Abstract

The present application relates to the technical fields of high polymer material injection molding, in particular to a stress-removing constant-temperature uniform-pressure shaping device for vehicle lamp covers, comprising an annealing furnace and vertical conveyors arranged on the left and right sides of the inner cavity of the annealing furnace, a plurality of lamp cover placing frames movably arranged between the two groups of vertical conveyors, and a material conveying mechanism arranged at the bottom of the inner cavity of the annealing furnace and used for transferring the lamp cover placing frames. The bidirectional screw rod in the material conveying mechanism synchronously drives the reverse movement of the front and rear material conveying frames, the rear material conveying frame is reset to receive the lamp cover placing frames to be processed, the front material conveying frame moves the processed lamp cover placing frames out of the furnace, the front and rear material conveying frames alternately work in and out, and the vertical conveyors are cyclically lifted to realize the synchronization and parallel of the feeding and discharging and annealing processing and improve the production continuity.

Description

Technical Field

[0001] This invention relates to the field of polymer injection molding technology, and more specifically, to a stress-relieving, constant-temperature, and pressure-equalizing shaping device for automotive lamp covers. Background Technology

[0002] Automotive headlight covers are mostly injection molded from transparent polymer materials such as polycarbonate. During the molding process, residual internal stress is easily generated inside the part due to uneven melt flow orientation and cooling rate. This stress concentration phenomenon can cause the headlight cover to crack, become foggy, or experience optical distortion during use, directly affecting the light distribution accuracy and driving safety. To eliminate this stress, the headlight cover needs to be annealed.

[0003] Patent application number CN201920106599.5 discloses a vertical annealing furnace for automotive headlights, including a furnace body. The furnace body is divided into a heating zone and a cooling zone by an isolation plate. The cooling zone is provided with a feeding port and a discharging port. The heating zone is provided with an air supply channel and a return air channel, and the air supply channel and the return air channel are respectively provided with flow equalization regulating plates. Several heating tubes for heating are provided at the inner top of the furnace body. A circulating fan is provided at the inner top of the furnace body. The structure is simple, and the furnace body temperature uniformity and stability are higher.

[0004] However, in existing automotive lamp cover annealing equipment, the lamp cover placement rack is usually directly fixed to the hanging frame, which cannot be quickly separated from the conveying system. This means that loading and unloading must be carried out inside the furnace or while the machine is stopped. Furthermore, the lack of an automatic loading and unloading mechanism means that the loading, annealing, and unloading processes can only be carried out sequentially, resulting in poor production continuity and low efficiency. At the same time, the fixed connection method of the placement rack does not have automatic locking and unlocking functions, making it difficult to achieve reliable positioning and rapid release of the lamp cover placement frame during operation, which increases the number of operation steps and equipment downtime. Summary of the Invention

[0005] The purpose of this invention is to provide a stress-relieving constant temperature and pressure shaping device for automotive lamp covers. By synchronously driving the front and rear material conveying frames to move in opposite directions through a bidirectional lead screw in the material conveying mechanism, loading and unloading and annealing are synchronized and parallel, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A stress-relieving constant temperature and pressure shaping device for automotive lamp covers includes an annealing furnace and vertical conveyors arranged on the left and right sides of its inner cavity. Several lamp cover placement frames are movably arranged between the two sets of vertical conveyors. The lamp cover placement frames are driven by the vertical conveyors to move up and down in the annealing furnace. The bottom of the inner cavity of the annealing furnace is also provided with a material conveying mechanism for transferring the lamp cover placement frames. The vertical conveyor includes several hanging frames that circulate vertically within the annealing furnace; the lampshade placement frame is provided with a limiting component on its side, the limiting component including a round tube, a telescopic block vertically slidably embedded in the bottom of the round tube, and a rubber inner support sleeved on the outer end of the round tube and sliding relative to the telescopic block. In the above configuration, when the lampshade placement frame rises with the vertical conveyor and detaches from the feeding mechanism, the telescopic block is compressed by the top edge of the bracket and contracts, and the rubber inner support extends outward in conjunction with it, abutting against the inner wall of the bracket, thereby locking the lampshade placement frame between a pair of brackets.

[0007] The material conveying mechanism includes a bidirectional lead screw driven by a second motor and two material conveying frames arranged in parallel front and rear and threadedly engaged with the bidirectional lead screw.

[0008] In the above setup, the rear conveyor rack is used to carry the lampshade placement frame to be processed and move it to the picking position of the vertical conveyor, while the front conveyor rack is used to receive the processed lampshade placement frame that has been lowered by the vertical conveyor and move it to the outside of the annealing furnace.

[0009] In the technical solution of the present invention, the annealing furnace includes a furnace body, door panels fixedly connected to the front and rear sides of the furnace body by bolts, and a top cover fixedly connected to the top of the furnace body by bolts.

[0010] In the technical solution of the present invention, the interior of the furnace body is divided by a partition into an air inlet chamber that communicates with the outer wall, a heating chamber that is connected to the inner cavity of the furnace body and the air inlet chamber at the left and right ends respectively, and a drive chamber that is disposed on the upper and lower sides of the heating chamber. Air guide grilles are provided at the connection between the air inlet chamber and the heating chamber and at the connection between the heating chamber and the inner cavity of the furnace body.

[0011] In the above setup, the headlight cover is slowly raised and lowered under constant temperature and pressure conditions formed by the air intake chamber and heating chamber through the furnace body, which eliminates the internal stress of injection molding and avoids local deformation, thereby achieving the purpose of constant temperature and pressure shaping.

[0012] In the technical solution of the present invention, the vertical conveyor further includes a first motor fixedly connected to the inner wall of the lower drive cavity by bolts, four rotating shafts arranged in a matrix and rotatably connected to the inside of the drive cavity, sprockets coaxially connected to the ends of the rotating shafts, a chain sleeved between the four sprockets, synchronous pulleys tightly sleeved on the two lower rotating shafts, and a synchronous belt sleeved between the two synchronous pulleys. The output shaft of the first motor is coaxially connected to one of the lower rotating shafts, and the bracket moves with the chain.

[0013] In the technical solution of the present invention, the bracket includes a tripod body, a bent plate with an L-shaped longitudinal section welded and fixed to the bottom of the tripod body, and a round pin rotatably sleeved on the top of the tripod body. The other end of the round pin is coaxially connected to the mounting hole of the chain link. A slot is provided through the vertical plate of the bent plate.

[0014] In the above setup, the first motor drives the two lower shafts in coordination with the synchronous pulley and synchronous belt, so that the four sprockets and chains drive the hanging frame to move up and down stably in the furnace, providing continuous, slow and reliable vertical conveying power for the lamp cover placement frame, and ensuring the smooth operation of the annealing process.

[0015] In the technical solution of the present invention, the lampshade placement frame further includes a frame body and two sets of reinforcing strips welded and fixed to the bottom surface of the frame body, and positioning grooves are provided through the left and right ends of the reinforcing strips.

[0016] In the technical solution of the present invention, the limiting member further includes a limiting rod that is snapped and fixed to the top surface of the telescopic block and slides on the wall of the circular tube, a movable block that is axially slidably connected to the inside of the circular tube, a circular rod that is snapped and fixed to the center of the movable block, a spring sleeved on the outside of the circular rod, and an annular baffle that is snapped and fixed to the inner wall of the circular tube. The circular tube is snapped and fixed to the outer wall of the frame, and the rubber inner support is adhered to the outer end of the circular rod.

[0017] In the technical solution of the present invention, the wall of the circular tube is provided with a square groove for the sliding of the telescopic block, the bottom surface of the telescopic block is arc-shaped and the top two ends are provided with inclined chamfers, the bottom end of the movable block is provided with an inclined groove that matches the inclined chamfer at the top of the telescopic block, the bottom of the inclined groove is inclined toward the opening of the circular tube, the left and right ends of the spring respectively abut against the movable block and the annular baffle, and the elastic force provided by the spring pushes the movable block to move toward the telescopic block.

[0018] In the above setup, the limiting component is automatically triggered after the lampshade placement frame rises and disengages from the feeding mechanism. The telescopic block is retracted by the slot, and the rubber inner support extends outward to contact and lock with the tripod body. When the lampshade is placed, the spring pushes the movable block to reset each component, ensuring reliable and stable material handling.

[0019] In the technical solution of the present invention, the material conveying mechanism further includes a slide table and two guide rails that are fixedly connected to the top surfaces of the left and right ends of the slide table by bolts. The second motor is fixedly connected to the outer wall of the slide table by bolts, and the output shaft of the second motor is coaxially connected to the bidirectional lead screw.

[0020] In the technical solution of the present invention, the material conveying rack includes a frame, two bushings fixedly connected to the bottom surface of the frame by bolts, a slider fixedly connected to the corner of the bottom surface of the frame by bolts and slidably connected to the guide rail, a positioning frame fixedly connected to the corner of the top surface of the frame by bolts, and a support rod tightly fitted inside the front and rear positioning frames. Several limiting rings are integrally formed on the wall of the support rod, and the distance between two adjacent limiting rings is adapted to the distance between two reinforcing strips in the same group in the lampshade placement frame.

[0021] In the above setup, the second motor drives the bidirectional lead screw to rotate, which simultaneously drives the front conveyor frame to move forward along the guide rail to unload the processed lampshade placement frame. The rear conveyor frame then resets to receive new material. The two conveyor frames work in opposite directions alternately to achieve a continuous and uninterrupted automated loading and unloading cycle.

[0022] Compared with the prior art, the beneficial effects of the present invention are: 1. The stress-relieving constant temperature and pressure equalization shaping device for car headlight covers uses a bidirectional screw in the material conveying mechanism to synchronously drive the front and rear material conveying frames to move in opposite directions. The rear material conveying frame moves backward to reset and receive the light cover placement frame, while the front material conveying frame moves forward to move the processed light cover placement frame out of the furnace. The front and rear material conveying frames work alternately in and out, and with the vertical conveyor cyclically lifting and lowering, the loading and unloading of materials and the annealing process are synchronized and parallel, improving the continuity of production.

[0023] 2. The stress-relieving constant temperature pressure shaping device for the vehicle headlight cover uses a linkage structure in which the telescopic block in the limiting component is squeezed and retracted by the slot, and the rubber inner support extends and abuts against the triangular frame. When the headlight cover placement frame rises and disengages from the feeding mechanism, it automatically locks. When it falls to the position, the spring pushes each component to reset and release the lock. The material picking and placing process does not require additional drive, and the structure is simple and reliable. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the overall structure of the present invention; Figure 3 This is a cross-sectional schematic diagram of the annealing furnace in this invention; Figure 4 This is a partial structural diagram of the present invention; Figure 5 This is a schematic diagram of the vertical conveyor in this invention; Figure 6 For the present invention Figure 5 An enlarged schematic diagram of part A in the middle; Figure 7 This is a schematic diagram of the structure of the hanging bracket in this invention; Figure 8 This is a schematic diagram of the structure of the lampshade placement frame in this invention; Figure 9 This is a schematic diagram of the bottom structure of the lampshade placement frame in this invention; Figure 10 This is a cross-sectional view of the limiting component in this invention; Figure 11 This is a schematic diagram of the material conveying mechanism in this invention; Figure 12 This is a schematic diagram of the material conveying rack in this invention; Explanation of reference numerals in the attached figures: 100. Annealing furnace; 110. Furnace body; 111. Air inlet chamber; 112. Heating chamber; 113. Drive chamber; 120. Door panel; 130. Top cover; 200. Vertical conveyor; 210. First motor; 220. Shaft; 230. Sprocket; 240. Chain; 250. Hanger; 251. Triangular frame; 252. Bending plate; 2520. Slot; 253. Round pin; 260. Synchronous pulley; 270. Synchronous belt; 300. Lampshade placement frame; 310. Frame body; 320. Reinforcing strip; 321. Positioning groove; 330. Limiting component; 331. Round tube; 332. Telescopic block; 333. Limiting rod; 334. Movable block; 335. Round rod; 336. Rubber inner support; 337. Spring; 338. Annular baffle; 400. Material conveying mechanism; 410. Slide table; 420. Second motor; 430. Two-way lead screw; 440. Material conveying frame; 441. Frame body; 442. Bushing; 443. Slider; 444. Positioning frame; 445. Support rod; 4450. Limiting ring; 450. Guide rail. Detailed Implementation

[0025] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0026] Please see Figures 1-3 As shown, this embodiment provides a technical solution: A stress-relieving constant temperature and pressure shaping device for vehicle headlight covers includes an annealing furnace 100 and vertical conveyors 200 arranged on the left and right sides of its inner cavity. Several headlight cover placement frames 300 are movably arranged between the two sets of vertical conveyors 200. The headlight cover placement frames 300 are driven by the vertical conveyors 200 to rise and fall within the annealing furnace 100. The bottom of the inner cavity of the annealing furnace 100 is also provided with a material conveying mechanism 400 for transferring the headlight cover placement frames 300.

[0027] Furthermore, the annealing furnace 100 includes a furnace body 110, door panels 120 that are bolted to the front and rear sides of the inner cavity of the furnace body 110, and a top cover 130 that is bolted to the top of the furnace body 110.

[0028] Furthermore, the interior of the furnace body 110 is divided by a partition into an air inlet chamber 111 that communicates with the outer wall, a heating chamber 112 that communicates with the inner cavity of the furnace body 110 and the air inlet chamber 111 at its left and right ends respectively, and a drive chamber 113 located on the upper and lower sides of the heating chamber 112. Air guide grilles are provided at the connection between the air inlet chamber 111 and the heating chamber 112, and at the connection between the heating chamber 112 and the inner cavity of the furnace body 110.

[0029] Furthermore, the front and rear door panels 120 and the top cover 130 of the annealing furnace 100 together enclose the inner cavity of the furnace body 110 into a relatively sealed processing space. Hot air is introduced through the air inlet chamber 111, and after being evenly distributed by the air guide grille, it enters the heating chamber 112. After being further homogenized in the heating chamber 112, it is then evenly fed in from the left and right sides of the inner cavity of the furnace body 110 by the air guide grille, so that the inner cavity of the furnace body 110 forms an annealing environment with uniform temperature and pressure. The lamp cover placement frame 300 carries the car lamp cover and slowly rises and falls in the inner cavity of the furnace body 110 with the vertical conveyor 200. Under the constant temperature and pressure environment, it undergoes sufficient heating and natural cooling, and the molecular chains inside the material are rearranged, thereby eliminating the internal stress remaining during injection molding. At the same time, the uniform thermal field and pressure field cause the various parts of the car lamp cover to expand and contract synchronously, avoiding local deformation and ultimately achieving the shaping purpose. The drive chamber 113 is located on the upper and lower sides of the heating chamber 112, which isolates the transmission components of the vertical conveyor 200 from the heating area, ensuring transmission accuracy while avoiding heat source interference, and ensuring the lamp cover runs smoothly throughout the process.

[0030] In the above setup, the headlight cover is slowly raised and lowered under constant temperature and pressure conditions formed by the air inlet chamber 111 and the heating chamber 112 through the furnace body 110, which eliminates the internal stress of injection molding and avoids local deformation, thereby achieving the purpose of constant temperature and pressure shaping.

[0031] Please see Figures 4-7 As shown, in this embodiment, the vertical conveyor 200 includes a first motor 210 fixedly connected to the inner wall of the lower drive cavity 113 by bolts, four rotating shafts 220 arranged in a matrix and rotatably connected inside the drive cavity 113, sprockets 230 coaxially connected to the ends of the rotating shafts 220, a chain 240 sleeved between the four sprockets 230, several hangers 250 that circulate vertically within the annealing furnace 100, synchronous pulleys 260 tightly sleeved on the two lower rotating shafts 220, and a synchronous belt 270 sleeved between the two synchronous pulleys 260. The output shaft of the first motor 210 is coaxially connected to one of the lower rotating shafts 220, and the hanger 250 moves with the chain 240.

[0032] Furthermore, the bracket 250 includes a tripod body 251, a bent plate 252 with an L-shaped longitudinal cross-section welded and fixed to the bottom of the tripod body 251, and a round pin 253 rotatably sleeved on the top of the tripod body 251. The other end of the round pin 253 is coaxially connected to the mounting hole of the chain link 240. A slot 2520 is provided through the vertical plate of the bent plate 252. The tripod body 251 and the bent plate 252 are used to ensure the overall structural strength of the bracket 250, the slot 2520 is used to limit the position of the lampshade placement frame 300, and the round pin 253 is used to provide a placement base for the tripod body 251.

[0033] Furthermore, after the first motor 210 is started, it drives one of the rotating shafts 220 to rotate, and the power is transmitted through the sprocket 230 and the chain 240, thereby driving several hanging racks 250 to slowly circulate and rise and fall inside the furnace body 110. The synchronous pulley 260, in conjunction with the synchronous belt 270, is used to enable the two rotating shafts 220 located below to rotate synchronously.

[0034] In the above configuration, the first motor 210 drives the two lower rotating shafts 220 in coordination with the synchronous pulley 260 and the synchronous belt 270, so that the four sprockets 230 and the chain 240 drive the hanging frame 250 to move stably and cyclically up and down within the furnace body 110, providing continuous, slow and reliable vertical conveying power for the lamp cover placement frame 300, and ensuring the smooth operation of the annealing process.

[0035] Please see Figures 8-10 In this embodiment, the lampshade placement frame 300 includes a frame 310 and two sets of reinforcing strips 320 welded and fixed to the bottom surface of the frame 310. The lampshade placement frame 300 is provided with a limiting member 330 on its side.

[0036] Furthermore, positioning grooves 321 are provided through both ends of the reinforcing strip 320.

[0037] Furthermore, the limiting member 330 includes a circular tube 331 that is snapped and fixed to the outer wall of the frame 310, a telescopic block 332 that is vertically slidably embedded in the bottom of the circular tube 331, a limiting rod 333 that is snapped and fixed to the top surface of the telescopic block 332 and slides on the wall of the circular tube 331, a movable block 334 that is axially slidably connected to the inside of the circular tube 331, a circular rod 335 that is snapped and fixed to the center of the movable block 334, a rubber inner support 336 that is sleeved on the outer end of the circular tube 331 and slides relative to the telescopic block 332 and is adhered to the outer end of the circular rod 335, a spring 337 that is sleeved on the outside of the circular rod 335, and an annular baffle 338 that is snapped on the inner wall of the circular tube 331. The size of the circular rod 335 is smaller than the size of the annular baffle 338. When the lampshade placement frame 300 rises with the vertical conveyor 200 and disengages from the feeding mechanism 400, the telescopic block 332 is compressed by the bracket 250 and contracts, and the rubber inner support 336 extends outward in conjunction with it, abutting against the bracket 250, thereby locking the lampshade placement frame 300 onto the bracket 250.

[0038] Furthermore, the wall of the circular tube 331 is provided with a square groove for the sliding of the telescopic block 332. The bottom surface of the telescopic block 332 is arc-shaped and the top two ends are provided with inclined chamfers. The bottom end of the movable block 334 is provided with an inclined groove that matches the inclined chamfer at the top of the telescopic block 332. The bottom of the inclined groove is inclined toward the opening of the circular tube 331. The left and right ends of the spring 337 abut against the movable block 334 and the annular baffle 338 respectively. The elastic force provided by the spring 337 pushes the movable block 334 to move toward the telescopic block 332. The telescopic block 332, as the active member, has its top inclined chamfer fitting with the inclined groove at the inner end of the movable block 334. The vertical motion is converted into the telescopic motion of the rubber inner support 336 through relative sliding.

[0039] Furthermore, the frame 310 and the reinforcing strip 320 are both used to ensure the overall structural strength of the lampshade placement frame 300, while the positioning groove 321 is used to determine the fixed position of the lampshade placement frame 300 inside the material conveying mechanism 400. The size of the frame 310 is smaller than the distance between the two symmetrically distributed hanging brackets 250 on the left and right.

[0040] Furthermore, the end of the limiting member 330 extends into the interior of the bent plate 252 in the bracket 250 but does not contact the tripod body 251. When the lampshade placement frame 300 rises and disengages from the feeding mechanism 400, the limiting member 330 is triggered. The telescopic block 332 is squeezed by the groove wall of the slot 2520 and retracts into the interior of the round tube 331, which drives the movable block 334 to squeeze the spring 337. Through the round rod 335, the rubber inner support 336 extends outward through the square groove of the tube wall of the round tube 331, thereby allowing the rubber inner support 336 to abut against the tripod body 251, thus ensuring the stability of the lampshade placement frame 300.

[0041] Furthermore, after the lampshade placement frame 300 is repositioned in the feeding mechanism 400, as the hanging bracket 250 disengages downward, the elastic force of the spring 337 pushes the movable block 334 to reset, and simultaneously drives the telescopic block 332 and the rubber inner support 336 to reset. At this time, the limit rod 333 restricts the downward position of the telescopic block 332.

[0042] In the above configuration, the limiting component 330 is automatically triggered after the lampshade placement frame 300 rises and disengages from the material conveying mechanism 400. The telescopic block 332 is squeezed and retracted by the slot 2520, and the rubber inner support 336 extends outward to abut and lock against the tripod body 251. When it is in place, the spring 337 pushes the movable block 334 to reset each component, ensuring reliable and stable material handling.

[0043] Please see Figures 11-12In this embodiment, the material conveying mechanism 400 includes a slide table 410, a bidirectional lead screw 430 driven by a second motor 420, two parallel conveying racks 440 that are threadedly engaged with the bidirectional lead screw 430, and two guide rails 450 that are bolted to the top surfaces of the left and right ends of the slide table 410. The conveying rack 440 located at the rear is used to carry the lampshade placement frame 300 to be processed and move it to the material picking position of the vertical conveyor 200. The conveying rack 440 located at the front is used to receive the processed lampshade placement frame 300 that has been lowered by the vertical conveyor 200 and move it to the outside of the annealing furnace 100.

[0044] Furthermore, the second motor 420 is fixedly connected to the outer wall of the slide table 410 by bolts, and the output shaft of the second motor 420 is coaxially connected to the bidirectional lead screw 430.

[0045] Furthermore, the material handling rack 440 includes a frame 441, two bushings 442 that are bolted to the bottom surface of the frame 441, a slider 443 that is bolted to the corner of the bottom surface of the frame 441 and slidably connected to the guide rail 450, a positioning frame 444 that is bolted to the corner of the top surface of the frame 441, and a support rod 445 that is tightly fitted inside the front and rear positioning frames 444. Several limiting rings 4450 are integrally formed on the wall of the support rod 445. The distance between two adjacent limiting rings 4450 is adapted to the distance between two reinforcing strips 320 in the same group in the lampshade placement frame 300. The bushings 442 are threaded to the bidirectional lead screw 430.

[0046] Furthermore, after the second motor 420 starts, it drives the bidirectional lead screw 430 to rotate, allowing the front conveyor frame 440 to carry the processed lampshade placement frame 300 to continue moving forward to the outside of the annealing furnace 100 to complete the unloading. Simultaneously, the rear conveyor frame 440 moves backward to the loading station, ready to carry the next set of lampshade placement frames 300 to be processed.

[0047] In the above setup, the second motor 420 drives the bidirectional lead screw 430 to rotate, which in turn drives the front conveyor frame 440 to move forward along the guide rail 450 to complete the unloading of the processed lampshade placement frame 300. The rear conveyor frame 440 resets backward to receive new material. The front and rear conveyor frames 440 work alternately in opposite directions to achieve a continuous and uninterrupted automated loading and unloading cycle.

[0048] The stress-relieving, constant-temperature, pressure-equalizing shaping device for vehicle headlight covers of the present invention includes the following steps in use: First, prepare for feeding; place the lampshade placement frame 300 containing the lampshade to be processed on the material conveying frame 440 located at the rear of the material conveying mechanism 400, so that the positioning groove 321 on the reinforcing strip 320 at the bottom of the frame 310 is embedded between two adjacent limiting rings 4450 on the support rod 445, thus completing the positioning of the lampshade placement frame 300. During the feeding stage, the second motor 420 is started, which drives the bidirectional lead screw 430 to rotate, thereby moving the rear conveyor frame 440 along the guide rail 450 toward the inner cavity of the annealing furnace 100, and transferring the lampshade placement frame 300 to be processed to the material picking position of the vertical conveyor 200. In the frame removal stage, the first motor 210 of the vertical conveyor 200 starts and drives the frame 250 through the rotating shaft 220, sprocket 230 and chain 240. During the vertical upward transport of the frame 250 below the lampshade placement frame 300 to be processed, the slot 2520 on the bending plate 252 aligns and engages with the limiting piece 330 of the lampshade placement frame 300, lifting the lampshade placement frame 300 upward and detaching it from the material conveyor 440. At the same time, after the lampshade placement frame 300 rises and disengages from the feeding mechanism 400, the limiting member 330 is triggered. The telescopic block 332 is squeezed by the groove wall of the slot 2520 and retracts into the interior of the round tube 331, which drives the movable block 334 to squeeze the spring 337. Through the round rod 335, the rubber inner support 336 extends outward through the square groove of the tube wall of the round tube 331, so that the rubber inner support 336 abuts against the tripod body 251, thereby ensuring the stability of the lampshade placement frame 300. Afterwards, the hanging bracket 250 continues to rise with the chain 240, driving the lampshade placement frame 300 to rise and fall within the annealing furnace 100 to the annealing area; As the above-mentioned hanging frame completes the frame removal, the material conveying frame 440 located on the front side simultaneously lowers and loosens; At this time, the annealed lampshade placement frame 300, along with the hanging bracket 250, has slowly descended to the top of the front conveyor frame 440 along the other side of the chain 240. As the hanging bracket 250 continues to move downward, the slot 2520 of the bending plate 252 disengages from the lampshade placement frame 300. Then, the elastic force of the spring 337 of the limiting member 330 pushes the movable block 334, thereby driving the limiting rod 333 and the rubber inner support 336 to reset. Subsequently, the second motor 420 drives the bidirectional lead screw 430 to rotate, causing the front conveyor frame 440 to move forward and the rear conveyor frame 440 to move backward and reset to the loading station; The front conveyor 440, carrying the processed lampshade placement frame 300, continues to move forward to the outside of the annealing furnace 100 to complete the unloading. Simultaneously, the rear conveyor 440 moves backward to the loading station, ready to carry the next set of lampshade placement frames 300 to be processed. In this way, the vertical conveyor 200 slowly cycles around, and multiple hangers 250 continuously rise and fall within the annealing furnace 100 along with the chain 240. The lampshade completes the annealing process during the lifting stroke and is released during the descent stroke. The two material conveying racks 440 work alternately, one in front and one behind, one in and one out, to achieve continuous and uninterrupted annealing operations.

[0049] The foregoing description of specific exemplary embodiments of the invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. The scope of the invention is intended to be defined by the specification and its equivalents.

Claims

1. A stress-relieving, constant-temperature, pressure-equalizing shaping device for automotive lamp covers, comprising an annealing furnace and vertical conveyors arranged on the left and right sides of its inner cavity, characterized in that: Several lampshade placement frames are movably arranged between the two sets of vertical conveyors. The lampshade placement frames are driven by the vertical conveyors to move up and down inside the annealing furnace. The bottom of the inner cavity of the annealing furnace is also provided with a material conveying mechanism for transferring the lampshade placement frames. The vertical conveyor includes several hanging frames that circulate vertically within the annealing furnace; the lampshade placement frame is provided with a limiting component on its side, the limiting component including a round tube, a telescopic block vertically slidably embedded in the bottom of the round tube, and a rubber inner support sleeved on the outer end of the round tube and sliding relative to the telescopic block. When the lampshade placement frame rises with the vertical conveyor and detaches from the feeding mechanism, the telescopic block is squeezed by the top edge of the bracket and contracts, and the rubber inner support extends outward in conjunction with it, abutting against the inner wall of the bracket, thereby locking the lampshade placement frame between a pair of brackets. The material conveying mechanism includes a bidirectional lead screw driven by a second motor and two parallel conveying frames that are threadedly engaged with the bidirectional lead screw. The rear conveying frame is used to carry the lampshade placement frame to be processed and move it to the material picking position of the vertical conveyor. The front conveying frame is used to receive the processed lampshade placement frame that has been lowered by the vertical conveyor and move it to the outside of the annealing furnace.

2. The stress relief constant temperature uniform pressure shaping device for vehicle lamp shade of claim 1, characterized in that: The annealing furnace includes a furnace body, door panels that are bolted to the front and rear sides of the furnace body cavity, and a top cover that is bolted to the top of the furnace body.

3. The stress-relieving, constant-temperature, and pressure-equalizing shaping device for vehicle headlight covers according to claim 2, characterized in that: The interior of the furnace body is divided by a partition into an air inlet chamber that is connected to the outer wall, a heating chamber that is connected to the inner cavity of the furnace body and the air inlet chamber at the left and right ends respectively, and a drive chamber located on the upper and lower sides of the heating chamber. Air guide grilles are provided at the connection between the air inlet chamber and the heating chamber and at the connection between the heating chamber and the inner cavity of the furnace body.

4. The stress-relieving, constant-temperature, and pressure-equalizing shaping device for vehicle headlight covers according to claim 3, characterized in that: The vertical conveyor also includes a first motor bolted to the inner wall of the drive cavity below, four rotating shafts arranged in a matrix and rotatably connected inside the drive cavity, sprockets coaxially connected to the ends of the rotating shafts, a chain sleeved between the four sprockets, synchronous pulleys tightly sleeved on the two rotating shafts below, and a synchronous belt sleeved between the two synchronous pulleys. The output shaft of the first motor is coaxially connected to one of the rotating shafts located below, and the bracket moves with the chain.

5. The stress-relieving, constant-temperature, pressure-equalizing shaping device for vehicle headlight covers according to claim 4, characterized in that: The bracket includes a tripod body, a bent plate with an L-shaped longitudinal section welded and fixed to the bottom of the tripod body, and a round pin rotatably sleeved on the top of the tripod body. The other end of the round pin is coaxially connected to the mounting hole of the chain link. A slot is formed through the vertical plate of the bent plate.

6. The stress-relieving constant-temperature pressure equalization shaping device for vehicle lamp covers according to claim 5, characterized in that: The lampshade placement frame also includes a frame body and two sets of reinforcing strips welded and fixed to the bottom surface of the frame body. Positioning grooves are provided through the left and right ends of the reinforcing strips.

7. The stress-relieving constant-temperature pressure equalization shaping device for vehicle lamp covers according to claim 6, characterized in that: The limiting component also includes a limiting rod that is snapped and fixed to the top surface of the telescopic block and slides on the wall of the circular tube, a movable block that slides axially inside the circular tube, a circular rod that is snapped and fixed to the center of the movable block, a spring sleeved on the outside of the circular rod, and an annular baffle snapped to the inner wall of the circular tube. The circular tube is snapped and fixed to the outer wall of the frame, and the rubber inner support is adhered to the outer end of the circular rod.

8. The stress-relieving constant-temperature pressure equalization shaping device for vehicle lamp covers according to claim 7, characterized in that: The cylindrical tube wall has a square groove for the telescopic block to slide. The bottom surface of the telescopic block is arc-shaped and the top two ends have inclined chamfers. The bottom end of the movable block has an inclined groove that matches the inclined chamfer at the top of the telescopic block. The bottom of the inclined groove is inclined toward the opening of the cylindrical tube. The left and right ends of the spring abut against the movable block and the annular baffle, respectively. The elastic force provided by the spring pushes the movable block to move toward the telescopic block.

9. The stress-relieving constant-temperature pressure equalization shaping device for vehicle lamp covers according to claim 8, characterized in that: The material conveying mechanism also includes a slide table and two guide rails that are bolted to the top surfaces of the left and right ends of the slide table. The second motor is bolted to the outer wall of the slide table, and the output shaft of the second motor is coaxially connected to the bidirectional lead screw.

10. The stress-relieving constant-temperature pressure equalization shaping device for vehicle lamp covers according to claim 9, characterized in that: The material handling rack includes a frame, two bushings fixed to the bottom surface of the frame by bolts, a slider fixed to the corner of the bottom surface of the frame by bolts and slidably connected to the guide rail, a positioning frame fixed to the corner of the top surface of the frame by bolts, and a support rod tightly fitted inside the front and rear positioning frames. Several limiting rings are integrally formed on the wall of the support rod, and the distance between two adjacent limiting rings is adapted to the distance between two reinforcing strips in the same group in the lampshade placement frame.

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