Injection mold for light guide strip for automobile

Abstract

The utility model provides an injection mold for a light guide strip for an automobile, which relates to the technical field of automobile part production and comprises a base, a lower mold is fixedly connected to the upper end of the base, a synchronous scraping mechanism is arranged above the base and comprises a mounting block, and a moving groove is formed in the upper end of the mounting block. A servo motor is fixedly mounted on the front face of the mounting block, a lead screw is fixedly mounted on an output shaft of the servo motor through a coupler, one end of the lead screw penetrates through the mounting block and is rotationally connected with the rear inner wall of the moving groove through a bearing, and a threaded block is in threaded connection with the outer portion of the lead screw. And residual plastic in the upper mold and the lower mold can be directly and synchronously scraped through the upper scraping plate and the lower scraping plate, so that a complicated adjustment process required before each time of scraping is avoided, the cleaning efficiency is greatly improved, and the condition that the scraping plates are damaged due to adjustment errors is also avoided.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts manufacturing technology, and in particular to an injection mold for automotive light guide strips. Background Technology

[0002] Light guides can be used in outdoor, automotive, and yacht lighting. During the elongation process of automotive light guides, corresponding molding dies are required for processing. An injection mold is a type of mold used in injection molding processes, typically consisting of a mold core and a mold cavity. Plastic granules are heated to melt, and then the molten plastic is injected into the mold under high pressure. After cooling, it forms the desired product shape. Currently, in the injection molds used to produce automotive light guides, residual injection plastic easily accumulates inside the mold after injection molding. Furthermore, immediately after injection, the temperature inside the mold and the residual injection material is high, making it inconvenient for workers to clean immediately. However, after a period of time, the injection material will solidify, making subsequent cleaning difficult and affecting the next use.

[0003] For example, a Chinese patent document discloses an injection mold for automotive light guide strips (publication number: CN222135779U). This patent uses the telescopic end of a hydraulic rod to move the upper mold, thereby separating the upper mold from the lower mold. The molded light guide strip can then be removed. After removal, the output shaft of the drive motor rotates, driving the bidirectional lead screw to rotate, which in turn rotates the moving block. This allows for adjustment of the scraper's position. Then, an electric push rod is used to adjust the scraper's position so that it can fit against the inner walls of the lower and upper molds. The movement of the bidirectional lead screw allows the scraper to promptly scrape and remove residual injection plastic in the lower and upper molds, preventing the injection plastic from hardening and making subsequent cleaning difficult, thus avoiding affecting the next use and saving time and effort.

[0004] However, the adjustment is quite difficult. The drive motor moves the scraper between the upper and lower molds, a process that requires precise control to ensure the scraper reaches the intended position accurately. However, since the upper and lower molds are not in contact with the scraper at this point, subsequent adjustments become even more complex.

[0005] First, four electric push rods lower the scraper until it contacts the upper part of the lower mold. This step requires a high degree of accuracy and stability in the coordinated operation of the electric push rods. Perfectly guaranteeing the synchronization of the four electric push rods is difficult; even slight deviations can lead to uneven contact between the scraper and the lower mold, affecting the subsequent cleaning effect. Furthermore, during the adjustment process, operators need to constantly monitor the operation of the electric push rods to prevent excessive or insufficient descent, which undoubtedly increases the difficulty and workload of the operation.

[0006] Next, the hydraulic cylinder is activated to lower the upper mold until it contacts the upper end of the scraper. This again involves precise control of the hydraulic cylinder to ensure that the contact between the upper mold and the scraper is just right. If the hydraulic cylinder descends too quickly or too slowly, it may damage the scraper. At the same time, pressure control between the upper mold and the scraper also needs to be considered during this process. Excessive pressure may cause the scraper to deform or even break, while insufficient pressure may result in poor scraping effect.

[0007] The entire process is rather cumbersome and requires repeated adjustments. Each adjustment consumes time and effort, severely reducing cleaning efficiency. Utility Model Content

[0008] The purpose of this invention is to address the shortcomings of existing technologies. Currently, scraping residual materials from injection molds is a cumbersome process, which not only easily leads to operational errors and damage to the scraper, but also greatly reduces cleaning efficiency due to repeated adjustments.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] An injection mold for automotive light guide strips includes a base, a lower mold fixedly connected to the upper end of the base, and a synchronous scraping mechanism provided above the base.

[0011] The synchronous scraping mechanism includes a mounting block with a movable groove at its upper end. A servo motor is fixedly mounted on the front of the mounting block, and a lead screw is fixedly mounted on the output shaft of the servo motor via a coupling. One end of the lead screw passes through the mounting block and is rotatably connected to the rear inner wall of the movable groove via a bearing. A threaded block is threadedly connected to the external thread of the lead screw, and the external part of the threaded block is slidably connected to the inner wall of the movable groove. A movable block is fixedly connected to the upper end of the threaded block, and a lower scraper is fixedly connected to one side of the movable block. A sliding block is fixedly connected to one end of the lower scraper, and a guide rod is movably sleeved on the inner wall of the sliding block.

[0012] Preferably, the guide rod is fixedly connected to symmetrically distributed support blocks at both ends, the lower ends of the two support blocks are fixedly connected to the upper end of the base, and the upper end of the base is fixedly connected to a mounting bracket.

[0013] Preferably, a hydraulic cylinder is fixedly mounted on the upper end of the mounting frame, one end of the piston rod of the hydraulic cylinder passes through the mounting frame and is fixedly connected to an upper mold, and an injection hole is opened at the upper end of the upper mold.

[0014] Preferably, the upper end of the upper mold is fixedly connected with symmetrically distributed limiting rods, one end of each of the two limiting rods passing through and extending to the upper end of the mounting frame, and the two sides of the upper mold are fixedly connected with symmetrically distributed guide rails.

[0015] Preferably, a sliding connecting sleeve is slidably fitted onto the outside of the guide rail, and a driving block is fixedly connected to one side of the sliding connecting sleeve.

[0016] Preferably, a drive rod is movably sleeved on the inner wall of the drive block, and the lower end of one of the drive rods is fixedly connected to the upper end of the movable block.

[0017] Preferably, the lower end of another drive rod is fixedly connected to the upper end of the sliding block, and a fixing block is fixedly connected to the lower end of the drive block.

[0018] Preferably, upper scrapers are fixedly connected to the opposing surfaces of the two fixed blocks, and the lower end of the upper mold is in contact with the upper end of the lower mold.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] In this invention, the synchronous scraping mechanism enables the removal of residual plastic from the upper and lower molds by the upper and lower scrapers after the formed light guide strip is taken out. This avoids the need for a complicated adjustment process before each removal, greatly improving cleaning efficiency and preventing damage to the scrapers due to adjustment errors. Attached Figure Description

[0021] Figure 1 A schematic diagram of the main structure of an injection mold for an automotive light guide strip provided by this utility model;

[0022] Figure 2 A perspective view of the base structure of an injection mold for an automotive light guide strip provided by this utility model;

[0023] Figure 3 An exploded view of the mounting block structure of an injection mold for an automotive light guide strip provided by this utility model;

[0024] Figure 4 A three-dimensional view of the drive block structure of an injection mold for automotive light guide strips provided by this utility model.

[0025] Legend: 1. Base; 2. Lower mold; 3. Mounting block; 31. Servo motor; 32. Lead screw; 33. Moving groove; 34. Threaded block; 35. Moving block; 36. Lower scraper; 37. Sliding block; 38. Guide rod; 39. Support block; 310. Mounting bracket; 311. Hydraulic cylinder; 312. Upper mold; 313. Injection hole; 314. Limiting rod; 315. Guide rail; 316. Sliding connecting sleeve; 317. Drive block; 318. Drive rod; 319. Fixing block; 320. Upper scraper. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0027] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below with reference to relevant embodiments, and several embodiments of this utility model will be given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this utility model more thorough and complete.

[0028] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Example

[0030] like Figure 1-4 As shown, this utility model provides a technical solution: an injection mold for automotive light guide strips, including a base 1, a lower mold 2 fixedly connected to the upper end of the base 1, the surface of the lower mold 2 being treated with a special coating to prevent plastic from sticking and to facilitate cleaning of residual injection plastic, and a synchronous scraping mechanism being provided above the base 1.

[0031] The synchronous scraping mechanism includes a mounting block 3. The upper end of the mounting block 3 is provided with a moving groove 33. A servo motor 31 is fixedly mounted on the front of the mounting block 3. The output shaft of the servo motor 31 is fixedly mounted with a lead screw 32 through a coupling. The lead screw 32 is made of high-strength alloy steel and has high hardness and high-precision threads, which can withstand large axial forces and torques.

[0032] One end of the lead screw 32 passes through the mounting block 3 and is rotatably connected to the rear inner wall of the moving groove 33 via a bearing. The lead screw 32 is externally threaded with a threaded block 34. The inner wall of the moving groove 33 is smooth and flat, and its width and depth are precisely designed to match the size of the threaded block 34, ensuring the stability and smoothness of the threaded block 34 during movement.

[0033] The outer side of the threaded block 34 is slidably connected to the inner wall of the moving groove 33. The upper end of the threaded block 34 is fixedly connected to the moving block 35. The side of the moving block 35 is fixedly connected to the lower scraper 36. The lower scraper 36 is made of high-strength wear-resistant material, has good hardness and wear resistance, and can effectively scrape off the residual plastic on the lower mold 2.

[0034] A sliding block 37 is fixedly connected to one end of the lower scraper 36. A guide rod 38 is movably sleeved on the inner wall of the sliding block 37. The surface of the guide rod 38 has been finely machined to ensure smoothness and straightness, providing stable guidance for the movement of the sliding block 37.

[0035] The guide rod 38 is fixedly connected to two symmetrically distributed support blocks 39 at both ends. The lower ends of the two support blocks 39 are fixedly connected to the upper end of the base 1. The upper end of the base 1 is fixedly connected to the mounting bracket 310. The bottom of the support blocks 39 is fixedly connected to the upper end of the base 1 by bolts to ensure the stability of the guide rod 38.

[0036] A hydraulic cylinder 311 is fixedly mounted on the upper end of the mounting bracket 310. One end of the piston rod of the hydraulic cylinder 311 passes through the mounting bracket 310 and is fixedly connected to the upper mold 312. An injection hole 313 is opened at the upper end of the upper mold 312. The size and shape of the injection hole 313 are precisely designed to match the nozzle of the injection molding machine, ensuring that the plastic can be smoothly injected into the mold. The inner wall of the injection hole 313 is smoothed to reduce the resistance to the flow of plastic.

[0037] The upper end of the upper mold 312 is fixedly connected with symmetrically distributed limiting rods 314. One end of each limiting rod 314 passes through and extends to the upper end of the mounting frame 310. The two sides of the upper mold 312 are fixedly connected with symmetrically distributed guide rails 315. The surface of the limiting rods 314 has been finely processed to ensure smoothness and straightness. The function of the limiting rods 314 is to limit the position of the upper mold 312 during the rising and falling process, and to ensure the accuracy and stability of its movement.

[0038] A sliding connecting sleeve 316 is slidably sleeved on the outside of the guide rail 315. A driving block 317 is fixedly connected to one side of the sliding connecting sleeve 316. The sliding connecting sleeve 316 is made of high-quality metal material, and its internal shape matches the external shape of the guide rail 315 to ensure stability during sliding. The surface of the sliding connecting sleeve 316 is smoothed to reduce frictional resistance with the guide rail 315.

[0039] A drive rod 318 is movably sleeved on the inner wall of the drive block 317. The lower end of one of the drive rods 318 is fixedly connected to the upper end of the moving block 35. The surface of the drive rod 318 has been finely machined to ensure smoothness and straightness. The function of the drive rod 318 is to transmit power so that the upper scraper 320 and the lower scraper 36 can move synchronously.

[0040] The lower end of another drive rod 318 is fixedly connected to the upper end of the sliding block 37. The lower end of the drive block 317 is fixedly connected to a fixing block 319. The fixing block 319 is cuboid in shape and made of sturdy metal material, with good rigidity and stability. The surface of the fixing block 319 is smoothed to reduce friction with the upper scraper 320.

[0041] The two fixed blocks 319 are fixedly connected to the opposite surfaces of the upper scraper 320. The lower end of the upper mold 312 contacts the upper end of the lower mold 2. The upper scraper 320 is made of high-strength wear-resistant material and works with the lower scraper 36 to scrape off the residual plastic in the upper mold 312 and the lower mold 2. The shape of the upper scraper 320 is carefully designed to match the surface shape of the upper mold 312 to ensure good scraping effect.

[0042] The working process of this utility model:

[0043] Step 1: After injection molding is completed, the piston rod of hydraulic cylinder 311 is activated to drive the upper mold 312 to rise and move away from the lower mold 2, and the molded light guide strip is taken out. When the upper mold 312 rises, it drives the drive block 317 to rise through the guide rail 315 and the sliding connecting sleeve 316. The rising movement of the drive block 317 drives the fixed block 319 to rise along the guide of the drive rod 318. The fixed block 319 drives the upper scraper 320 to rise synchronously, so that the upper end of the upper scraper 320 is always at the same horizontal line as the lower end of the upper mold 312.

[0044] Step 2: Start the servo motor 31 to drive the lead screw 32 to rotate clockwise. The rotation of the lead screw 32 is guided by the moving groove 33 to move the threaded block 34. The movement of the threaded block 34 is driven by the cooperation of the moving block 35 and the sliding block 37 to move the lower scraper 36. The movement of the sliding block 37 is stably guided by the cooperation of the guide rod 38 and the support block 39. The movement of the lower scraper 36 is achieved by its lower end contacting the upper end of the lower mold 2, thereby scraping off the residual plastic accumulated on the lower mold 2.

[0045] Step 3: When the moving block 35 and the sliding block 37 move, the two driving rods 318 drive the driving block 317 to move. The movement of the driving block 317 is stably guided by the guide rail 315 and the sliding connecting sleeve 316. The movement of the driving block 317 also drives the upper scraper 320 to move through the fixed block 319, thereby scraping off the plastic residue at the lower end of the upper mold 312. After scraping is completed, the servo motor 31 is started to drive the lead screw 32 to rotate counterclockwise, so that the lower scraper 36 and the upper scraper 320 move and reset, waiting for the next cleaning.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An injection mold for automotive light guide strips, comprising a base (1), characterized in that: The upper end of the base (1) is fixedly connected to the lower mold (2), and a synchronous scraping mechanism is provided above the base (1); The synchronous scraping mechanism includes a mounting block (3), the upper end of which is provided with a moving groove (33). A servo motor (31) is fixedly mounted on the front of the mounting block (3). A lead screw (32) is fixedly mounted on the output shaft of the servo motor (31) through a coupling. One end of the lead screw (32) passes through the mounting block (3) and is rotatably connected to the rear inner wall of the moving groove (33) through a bearing. A threaded block (34) is threaded to the outside of the lead screw (32). The outside of the threaded block (34) is slidably connected to the inner wall of the moving groove (33). A moving block (35) is fixedly connected to the upper end of the threaded block (34). A lower scraper (36) is fixedly connected to one side of the moving block (35). A sliding block (37) is fixedly connected to one end of the lower scraper (36). A guide rod (38) is movably sleeved on the inner wall of the sliding block (37). The guide rod (38) is fixedly connected to two symmetrically distributed support blocks (39) at both ends. The lower ends of the two support blocks (39) are fixedly connected to the upper end of the base (1). The upper end of the base (1) is fixedly connected to a mounting bracket (310). A hydraulic cylinder (311) is fixedly installed on the upper end of the mounting bracket (310). One end of the piston rod of the hydraulic cylinder (311) passes through the mounting bracket (310) and is fixedly connected to the upper mold (312). An injection hole (313) is opened at the upper end of the upper mold (312). The upper end of the upper mold (312) is fixedly connected with symmetrically distributed limiting rods (314), one end of each of the two limiting rods (314) passes through and extends to the upper end of the mounting frame (310), and the two sides of the upper mold (312) are fixedly connected with symmetrically distributed guide rails (315). The guide rail (315) is slidably sleeved with a sliding connecting sleeve (316), and a driving block (317) is fixedly connected to one side of the sliding connecting sleeve (316). The inner wall of the drive block (317) is movably sleeved with a drive rod (318), and the lower end of one of the drive rods (318) is fixedly connected to the upper end of the moving block (35). The lower end of another drive rod (318) is fixedly connected to the upper end of the sliding block (37), and the lower end of the drive block (317) is fixedly connected to a fixing block (319). The two fixed blocks (319) are fixedly connected to the upper scraper (320) on their opposite surfaces, and the lower end of the upper mold (312) is in contact with the upper end of the lower mold (2).

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