An injection mold and method for automotive sealing strips

Abstract

This invention belongs to the technical field of extrusion molding equipment, specifically relating to an injection mold and method for automotive sealing strips. It includes an injection tube head, with a first square mold plate inserted into the end of the injection tube head. A second square mold plate abuts against one side of the first square mold plate. A first die opening is formed through the middle of the first square mold plate, and a second die opening is formed through the middle of the second square mold plate. The first and second die openings have the same shape, and the size of the first die opening is larger than that of the second die opening. This invention enables rapid switching between the production of automotive sealing strips of different sizes without stopping the machine, while also ensuring the molding quality of the automotive sealing strips. This invention facilitates quick and easy rotation of the limiting tube and also provides limiting functionality. Furthermore, this invention allows for convenient and quick disassembly of the first and second square mold plates.

Description

Technical Field

[0001] This invention belongs to the technical field of extrusion molding equipment, specifically relating to an injection mold and method for automotive sealing strips. Background Technology

[0002] Injection molds are tools used in rubber and plastic processing. Molten rubber or plastic is injected into a mold cavity, and after cooling, a part of the desired shape is obtained. Automotive sealing strips are rubber or plastic products used in automobile manufacturing to seal doors, windows, body panels, and other parts, preventing water, dust, noise, and other contaminants from entering the vehicle. Injection molds play a crucial role in the production of automotive sealing strips, ensuring, through precise design and processing, that the dimensions, shape, and function of the sealing strips meet the high standards required by the automotive industry.

[0003] Chinese patent application number 202310029812.8 discloses an injection molding equipment for automotive sealing strips with a rapid demolding function. The equipment includes a molding device, a feeding device, and a cooling device. The feeding device is located above the molding device, and the cooling devices are located on both sides of the molding device. Compared to current automotive sealing strip injection molding equipment, this patent includes a demolding mechanism composed of a top plate and a calibration block. A first magnetic field generator and a first extrusion plate inside the calibration block enable the molded sealing strip to be quickly ejected from the cavity. When two sets of first conductive blocks inside the calibration block are connected to an external power source and an ammeter, changes in current can be monitored to determine changes in cavity pressure. The pressure inside the cavity can be adjusted in real time via the first magnetic field generator and a telescopic rod inside the pressure chamber, preventing excessive or insufficient pressure that could lead to substandard sealing strip quality.

[0004] When producing automotive sealing strips using injection molds, switching between different sizes of sealing strips often requires stopping the machine to replace the mold head, resulting in a long and cumbersome switching cycle. Furthermore, it is difficult to guarantee the molding quality of the automotive sealing strips during the switching process. Moreover, the mold head cannot be disassembled quickly, leading to solidification at the connection between the mold head and the extrusion head, making disassembly difficult. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an injection mold and method for automotive sealing strips. Through the cooperation of a first square mold plate, a second square mold plate, and a limiting mechanism, this invention enables rapid switching between the production of automotive sealing strips of different sizes without stopping the machine, while also ensuring the molding quality of the automotive sealing strips. The structural design of the first bracket facilitates quick and easy rotation of the limiting tube while also providing limiting functionality. Furthermore, the cooperation of the second bracket and the limiting mechanism ensures rapid switching between the production of automotive sealing strips of different sizes without stopping the machine, and also allows for convenient and quick disassembly of the first and second square mold plates.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An injection mold for automotive sealing strips includes an injection tube head, an end of which is inserted into a first square mold plate, and a second square mold plate abutting against one side of the first square mold plate; a first mold opening is formed through the middle of the first square mold plate, and a second mold opening is formed through the middle of the second square mold plate; the first mold opening and the second mold opening have the same shape, and the size of the first mold opening is larger than the size of the second mold opening.

[0008] The first square mold plate and the second square mold plate are both inserted into the limiting mechanism. When the injection tube head is injecting, the centers of the first mold opening and the second mold opening are aligned.

[0009] Furthermore, a connector is fixedly provided on one side of the first square mold plate, and the connector is inserted into the end of the injection tube head; two first limiting grooves are symmetrically provided on the bottom of the first square mold plate, and the bottom is an inclined first slope; a positioning transverse groove is provided on the first limiting groove on the first square mold plate away from the injection tube head; two second limiting grooves are symmetrically provided on the bottom of the second square mold plate, and the bottom is an inclined second slope; a positioning circular groove is provided on the second limiting groove on the second square mold plate away from the first square mold plate.

[0010] Furthermore, the limiting mechanism includes a limiting rod and a limiting tube sleeved outside the limiting rod; a spring box is symmetrically fixed on the side wall of the injection molding tube head, and a sliding circular groove is opened at one end of the spring box, which is slidably connected to the limiting rod; two first limiting blocks are symmetrically fixed on the limiting rod, and the first limiting blocks are correspondingly adapted to the positioning transverse groove; two second limiting blocks are symmetrically fixed at the end of the limiting tube, and a sliding rod is fixedly connected to one side of the second limiting block, and a limiting spring is sleeved on the sliding rod; a base is provided below the limiting tube, and a first bracket and a second bracket are fixedly installed on the base, and the sliding rod and the limiting tube are slidably connected to the first bracket; the limiting spring is located between the second limiting block and the first bracket; one end of the limiting rod is slidably installed on the second bracket.

[0011] Furthermore, the length between the outer ends of the two second limiting blocks corresponds to and is adapted to the positioning groove. When the two second limiting blocks are set horizontally, the second limiting blocks are limited on the positioning groove; when the two second limiting blocks are set vertically, the second limiting blocks pass through the second limiting groove.

[0012] Furthermore, a circular through groove is formed through the first support, and an annular groove is formed on the inner wall of the circular through groove; an adjustment groove is formed on one side of the first support, and the adjustment groove communicates with the annular groove; an adjustment plate is provided on the circular through groove, and a limiting ring is fixedly provided on the side wall of the adjustment plate, and the limiting ring is rotatably connected to the annular groove of the circular through groove; a first sliding hole and a second sliding hole are formed through the adjustment plate; the first sliding hole is slidably connected to the limiting tube, and the second sliding hole is slidably connected to the sliding rod; an adjustment rod is fixedly connected to the limiting ring, and the adjustment rod passes through the adjustment groove and faces outward.

[0013] Furthermore, the second bracket includes an L-shaped folding plate, one end of which is fixedly connected to the base; a material outlet is provided in the middle of the vertical plate of the L-shaped folding plate; support rods are fixedly provided on both sides of the vertical plate of the L-shaped folding plate, the support rods are slidably connected to the limiting tube, and one end of the support rod is fixedly connected to one end of the limiting rod through a second limiting spring; a return spring is sleeved on the limiting rod located inside the spring box, and the two ends of the return spring are fixedly connected to the end of the limiting rod and the inner wall of one end of the spring box, respectively.

[0014] Furthermore, when the first square mold plate and the second square mold plate are installed in place and the limiting spring limits and fixes the mold plate, the reset spring is in a stretched state and the second limiting spring is in a compressed state; when the limiting spring is released, the reset spring retracts and resets, and the second limiting spring continues to be compressed.

[0015] Furthermore, the horizontal plate of the L-shaped folding plate has through grooves on both sides, and a sliding plate is slidably connected to the grooves. A push plate is fixedly connected to the upper end of the sliding plate, and a second sliding rod is fixedly connected to the lower end of the sliding plate. A limiting groove is opened through the sliding plate, and a limiting tube is located in the limiting groove. A second limiting ring is fixedly provided at the end of the limiting tube. Through holes are opened through the bottom of both sides of the vertical plate of the L-shaped folding plate, and the second sliding rod is slidably connected to the corresponding through hole.

[0016] Furthermore, the base is provided with an adapter groove, and the bottom of the adapter groove is fixedly connected to an adapter plate by multiple adapter springs. The adapter plate is slidably connected to the adapter groove. The adapter plate is located below the first square mold plate and the second square mold plate.

[0017] A limiting disc is fixedly provided at one end of the slide rod away from the second limiting block.

[0018] This invention also claims a method for operating using the above-mentioned automotive sealing strip injection mold, comprising the following steps:

[0019] S1. When producing small-sized sealing strips, both the first square mold plate and the second square mold plate are used simultaneously.

[0020] S2. When switching to the production of large-size sealing strips, the limit spring is used to limit the first square mold plate, then the sealing strip is cut and the second square mold plate is pulled up.

[0021] S3. When switching to the production of small-sized sealing strips, insert the second square mold plate to cut the sealing strip and restore the limit spring to the limit position of the second square mold plate.

[0022] S4. When it is necessary to disassemble the first square mold plate and the second square mold plate, release the limit spring to allow the first square mold plate to automatically detach from the injection tube head.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] (1) This invention, through the cooperation of the first square mold plate, the second square mold plate and the limiting mechanism, can achieve rapid switching between the production of automotive sealing strips of different sizes without stopping the machine, while also ensuring the molding quality of the automotive sealing strips; specifically, through the cooperation of the limiting rod and the limiting tube of the limiting mechanism, when producing small-sized sealing strips, the first square mold plate and the second square mold plate are used simultaneously. At this time, the raw material is extruded from the injection tube head and passes through the first mold opening and the second mold opening in sequence to form a small-sized sealing strip; when switching to the production of large-sized sealing strips, the limiting spring is used to limit the first square mold plate; at this time, the second square mold plate will be pushed laterally a certain distance by the sealing strip extruded by the first square mold plate, so that the second square mold plate can be limited. The sealing strips at both ends of the mold plate are quickly cut off; when switching from the production of small-sized sealing strips, the second inclined surface at the lower end of the second square mold plate is inserted between the first and second limiting blocks, during which the second inclined surface cuts off the sealing strip; ultimately, a rapid, non-stop conversion from the production of large-sized sealing strips to small-sized sealing strips is achieved; at the same time, due to the lateral limiting of the first and second limiting grooves, and the vertical limiting of the positioning horizontal groove and positioning circular groove, the centers of the first and second mold openings are always aligned after installation; since the size of the first mold opening is larger than the size of the second mold opening, the outer periphery of the first mold opening surrounds the outer periphery of the second mold opening, ensuring the smoothness and surface quality of the small-sized sealing strip extrusion when used simultaneously.

[0025] (2) The present invention facilitates the quick rotation of the limiting tube and also ensures the limiting position through the structural design of the first bracket. Specifically, since the limiting ring is rotatably connected to the annular groove of the circular through groove, and the first sliding hole and the second sliding hole are slidably connected to the limiting tube and the sliding rod respectively, by rotating the adjusting rod, the limiting ring and the adjusting plate rotate, and the limiting tube and the sliding rod rotate synchronously, thereby facilitating the quick rotation of the limiting tube. In addition, the first bracket remains stationary throughout the operation, which can always ensure the limiting effect of the limiting spring.

[0026] (3) This invention, through the cooperation of the second bracket and the limiting mechanism, can ensure rapid switching between the production of automotive sealing strips of different sizes without stopping the machine, and can also facilitate quick disassembly of the first square mold plate and the second square mold plate; specifically, when the first square mold plate and the second square mold plate are installed in place and the limiting spring limits and fixes the mold plate, the return spring is in a stretched state and the second limiting spring is in a compressed state. At this time, the second limiting spring and the limiting spring work together to make the first square mold plate and the second square mold plate fit tightly with the injection tube head, improving the installation stability, and the method of dispersing the force and limiting facilitates subsequent switching without effort; at the same time, when it is necessary to disassemble When removing the first square mold plate and the second square mold plate, pulling the push plate, under the limitation of the second limiting ring, allows the sliding plate to quickly move the limiting tube, thereby quickly releasing the limitation of the limiting spring. After the limitation is released, due to the retraction and reset action of the return spring, the second limiting spring continues to be compressed, causing the first square mold plate to move one distance and automatically disengage from the injection tube head until the return spring and the second limiting spring maintain balance. This rapid and automatic disengagement when the limitation is released avoids the problem of the injection tube head's insertion tube being unable to be pulled out due to the solidification of residual raw material on the side wall of the injection tube head. This facilitates the quick disassembly of the first square mold plate and the second square mold plate, and also facilitates the installation of the first square mold plate. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of an injection mold for an automotive sealing strip according to the present invention;

[0028] Figure 2 This is a schematic diagram of the dispersion structure of an injection mold for an automotive sealing strip according to the present invention;

[0029] Figure 3 This is a schematic diagram of the injection tube head and the dispersion structure of the limiting rod of an injection mold for an automotive sealing strip according to the present invention.

[0030] Figure 4 This is a schematic diagram of the structure of a first square mold plate and a second square mold plate for an automotive sealing strip injection mold according to the present invention. Figure 1 ;

[0031] Figure 5 This is a schematic diagram of the structure of a first square mold plate and a second square mold plate for an automotive sealing strip injection mold according to the present invention. Figure 2 ;

[0032] Figure 6 This is a schematic diagram of the limiting tube and limiting rod structure of an injection mold for an automotive sealing strip according to the present invention.

[0033] Figure 7 This is a schematic diagram of the limiting tube and the dispersing structure of the limiting rod of an injection mold for an automotive sealing strip according to the present invention.

[0034] Figure 8 This is a partial structural diagram of the first bracket of an automotive sealing strip injection mold according to the present invention;

[0035] Figure 9 This is a schematic diagram of the first support dispersion structure of an automotive sealing strip injection mold according to the present invention;

[0036] Figure 10 This is a partial structural diagram of the second bracket of an automotive sealing strip injection mold according to the present invention;

[0037] Figure 11 This is a schematic diagram of the partial dispersion structure of the second support of an automotive sealing strip injection mold according to the present invention.

[0038] The attached figures are labeled as follows:

[0039] Base-100, Adapter Slot-110, Adapter Plate-120, Adapter Spring-130, Injection Tube Head-200, Spring Box-210, Sliding Circular Slot-211, First Square Mold Plate-300, First Limiting Slot-310, Insert Pipe-320, First Mold Opening-330, First Inclined Surface-340, Positioning Horizontal Slot-350, Second Square Mold Plate-400, Second Limiting Slot-410, Second Mold Opening-420, Second Inclined Surface-430, Positioning Circular Slot-440, First Support-500, Circular Through Slot-510, Adjustment Slot-520, Adjustment Plate-530, Limiting Ring -531, First sliding hole -532, Second sliding hole -533, Adjusting rod -540, Limiting tube -600, Second limiting block -610, Limiting spring -620, Sliding rod -630, Limiting disc -631, Second limiting ring -640, Limiting rod -700, First limiting block -710, Reset spring -720, Second bracket -800, L-shaped folding plate -810, Sliding groove -811, Material outlet -820, Through hole -830, Slide plate -840, Limiting through groove -841, Push plate -842, Second sliding rod -850, Support rod -860, Second limiting spring -870. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. Of course, the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0041] Although the steps in this invention are arranged by reference numerals, this is not intended to limit the order of the steps. Unless the order of the steps is explicitly stated or the execution of a step requires other steps as a basis, the relative order of the steps can be adjusted. It is understood that the term "and / or" as used herein refers to and covers any and all possible combinations of one or more of the associated listed items.

[0042] Example

[0043] like Figures 1-11 As shown, an injection mold for an automotive sealing strip includes an injection tube head 200, with a first square mold plate 300 inserted into the end of the injection tube head 200. A second square mold plate 400 abuts against one side of the first square mold plate 300. A first mold opening 330 is provided through the middle of the first square mold plate 300, and a second mold opening 420 is provided through the middle of the second square mold plate 400. The first mold opening 330 and the second mold opening 420 have the same shape, and the size of the first mold opening 330 is larger than the size of the second mold opening 420.

[0044] The first square mold plate 300 and the second square mold plate 400 are both inserted into the limiting mechanism. When the injection tube head 200 injects, the centers of the first mold opening 330 and the second mold opening 420 are aligned.

[0045] This invention, through the cooperation of the first square mold plate 300, the second square mold plate 400 and the limiting mechanism, can achieve rapid switching between the production of automotive sealing strips of different sizes without stopping the machine, while also ensuring the molding quality of the automotive sealing strips; a detailed description will follow.

[0046] It is worth noting that there is an injection molding device, such as a screw extruder, installed on one side of the injection tube head 200. Since this part is not the core content of the invention, it is not shown in detail in the schematic diagram.

[0047] Furthermore, a connector 320 is fixedly provided on one side of the first square mold plate 300, and the connector 320 is inserted into the end of the injection tube head 200; two first limiting grooves 310 are symmetrically provided on the bottom of the first square mold plate 300, and the bottom is an inclined first slope 340; a positioning transverse groove 350 is provided on the first limiting groove 310 located away from the injection tube head 200; two second limiting grooves 410 are symmetrically provided on the bottom of the second square mold plate 400, and the bottom is an inclined second slope 430; a positioning circular groove 440 is provided on the second limiting groove 410 located away from the first square mold plate 300.

[0048] Furthermore, the limiting mechanism includes a limiting rod 700 and a limiting tube 600 sleeved outside the limiting rod 700; a spring box 210 is symmetrically fixed on the side wall of the injection molding tube head 200, and a sliding circular groove 211 is opened at one end of the spring box 210, the sliding circular groove 211 being slidably connected to the limiting rod 700; two first limiting blocks 710 are symmetrically fixed on the limiting rod 700, and the first limiting blocks 710 are correspondingly adapted to the positioning transverse groove 350; two second limiting blocks 710 are symmetrically fixed at the end of the limiting tube 600. Two limiting blocks 610 are provided. A sliding rod 630 is fixedly connected to one side of the second limiting block 610. A limiting spring 620 is sleeved on the sliding rod 630. A base 100 is provided below the limiting tube 600. A first bracket 500 and a second bracket 800 are fixedly installed on the base 100. The sliding rod 630 and the limiting tube 600 are slidably connected to the first bracket 500. The limiting spring 620 is located between the second limiting block 610 and the first bracket 500. One end of the limiting rod 700 is slidably installed on the second bracket 800.

[0049] This invention utilizes the cooperation of the limiting rod 700 and the limiting tube 600 in the limiting mechanism. When producing small-sized sealing strips, the first square mold plate 300 and the second square mold plate 400 are used simultaneously. Since the first limiting block 710 of the limiting rod 700 and the second limiting block 610 of the limiting tube 600 respectively limit and abut against the positioning transverse groove 350 and the positioning circular groove 440, the injection molding tube head 200, the first square mold plate 300, and the second square mold plate 400 are sequentially and tightly fitted together. At this time, the raw material is extruded from the injection molding tube head 200 and sequentially passes through the first die opening 330 and the second die opening 420 to form small-sized... When switching to the production of larger size sealing strips, the limiting tube 600 is rotated to vertically position the two second limiting blocks 610. At this time, the second limiting blocks 610 pass through the second limiting groove 410 and press against the first square mold plate 300, causing the limiting spring 620 to limit the first square mold plate 300. After the second square mold plate 400 is released from its limit position, it will be laterally pushed a certain distance by the sealing strip extruded from the first square mold plate 300, allowing for rapid cutting of the sealing strips at both ends of the second square mold plate 400. Finally, pulling up the second square mold plate 400 allows the production of smaller size sealing strips to be completed. The production of large-size sealing strips can be quickly switched without stopping the machine. When switching to small-size sealing strip production, the limiting tube 600 is rotated to restore the second limiting block 610 to its horizontal position. At this time, the second square mold plate 400 is aligned with the first square mold plate 300 and inserted downwards. The second inclined surface 430 at the lower end of the second square mold plate 400 is inserted and squeezed between the first limiting block 710 and the second limiting block 610. Under the pressure of the second limiting block 610, the second square mold plate 400 and the first square mold plate 300 are kept in contact until the second limiting block 610 is inserted into the positioning groove 440 and the insertion stops. During the process, the second inclined surface 430 will cut the sealing strip; ultimately, a rapid conversion from large-size sealing strip to small-size sealing strip production without stopping the machine is achieved; at the same time, due to the lateral limiting of the first limiting groove 310 and the second limiting groove 410, and the vertical limiting of the positioning horizontal groove 350 and the positioning circular groove 440, the centers of the first die 330 and the second die 420 are always aligned after installation; since the size of the first die 330 is larger than the size of the second die 420, the outer periphery of the first die 330 surrounds the outer periphery of the second die 420, so that the smoothness of the small-size sealing strip extrusion and the surface quality can be guaranteed when used at the same time.

[0050] It is worth noting that the top of both the first square mold plate 300 and the second square mold plate 400 of the present invention can be provided with heat-insulating handles to facilitate subsequent insertion operations. This is a standard feature and will not be described in detail here.

[0051] Furthermore, the length between the outer ends of the two second limiting blocks 610 corresponds to and matches the positioning groove 440. When the two second limiting blocks 610 are set horizontally, the second limiting blocks 610 are limited on the positioning groove 440; when the two second limiting blocks 610 are set vertically, the second limiting blocks 610 pass through the second limiting groove 410. Through the adaptation of the second limiting blocks 610 and the positioning groove 440, both limiting and ensuring that the second limiting blocks 610 can be rotated to release the limitation.

[0052] It is worth noting that when the sealing strips at both ends of the second square mold plate 400 are quickly cut, they can be cut quickly using an external cutter or scissors. Since the automotive sealing strips have not yet fully solidified at this stage, they are easy to cut quickly. This is a routine operation and will not be described in detail here.

[0053] Furthermore, a circular through groove 510 is formed through the first support 500, and an annular groove is formed on the inner wall of the circular through groove 510; an adjustment groove 520 is formed on one side of the first support 500, and the adjustment groove communicates with the annular groove; an adjustment plate 530 is provided on the circular through groove 510, and a limiting ring 531 is fixedly provided on the side wall of the adjustment plate 530, and the limiting ring 531 is rotatably connected to the annular groove of the circular through groove 510; a first sliding hole 532 and a second sliding hole 533 are formed through the adjustment plate 530; the first sliding hole 532 is slidably connected to the limiting tube 600, and the second sliding hole 533 is slidably connected to the sliding rod 630; an adjustment rod 540 is fixedly connected to the limiting ring 531, and the adjustment rod 540 passes through the adjustment groove 520 and faces outward.

[0054] The present invention, through the structural design of the first bracket 500, facilitates the rapid rotation of the limiting tube 600 while also ensuring its positioning. Specifically, since the limiting ring 531 is rotatably connected to the annular groove of the circular through groove 510, and the first sliding hole 532 and the second sliding hole 533 are slidably connected to the limiting tube 600 and the sliding rod 630, respectively, by rotating the adjusting rod 540, the limiting ring 531 and the adjusting plate 530 rotate, causing the limiting tube 600 and the sliding rod 630 to rotate synchronously. This facilitates the rapid rotation of the limiting tube 600, and throughout the entire operation, the first bracket 500 remains stationary, ensuring the positioning effect of the limiting spring 620.

[0055] Furthermore, the second bracket 800 includes an L-shaped folding plate 810, one end of which is fixedly connected to the base 100; a feed port 820 is provided in the middle of the vertical plate of the L-shaped folding plate 810; support rods 860 are fixedly provided on both sides of the vertical plate of the L-shaped folding plate 810, the support rods 860 are slidably connected to the limiting tube 600, and one end of the support rod 860 is fixedly connected to one end of the limiting rod 700 through a second limiting spring 870; a return spring 720 is sleeved on the limiting rod 700 located inside the spring box 210, and the two ends of the return spring 720 are fixedly connected to the end of the limiting rod 700 and the inner wall of one end of the spring box 210, respectively.

[0056] The present invention, through the cooperation of the second bracket 800 and the limiting mechanism, can ensure the rapid switching between the production of automotive sealing strips of different sizes without stopping the machine, and can also facilitate the quick disassembly of the first square mold plate 300 and the second square mold plate 400; a detailed description will follow.

[0057] Furthermore, when the first square mold plate 300 and the second square mold plate 400 are installed in place and the limiting spring 620 limits and fixes the mold plate, the reset spring 720 is in a stretched state and the second limiting spring 870 is in a compressed state; when the limiting spring 620 is released from the limit, the reset spring 720 retracts and resets, and the second limiting spring 870 continues to be compressed.

[0058] Furthermore, the L-shaped folding plate 810 has sliding grooves 811 extending through both sides of its horizontal plate. A sliding plate 840 is slidably connected to the sliding grooves 811. A push plate 842 is fixedly connected to the upper end of the sliding plate 840, and a second sliding rod 850 is fixedly connected to the lower end of the sliding plate 840. A limiting groove 841 is extending through the sliding plate 840, and a limiting tube 600 is located within the limiting groove 841. A second limiting ring 640 is fixedly provided at the end of the limiting tube 600. Through holes 830 are extending through the bottom of both sides of the vertical plate of the L-shaped folding plate 810, and the second sliding rod 850 is slidably connected to the corresponding through hole 830.

[0059] In this invention, when the first square mold plate 300 and the second square mold plate 400 are installed and the limiting spring 620 limits and fixes the mold plates, the return spring 720 is in a stretched state and the second limiting spring 870 is in a compressed state. At this time, the second limiting spring 870 and the limiting spring 620 work together to ensure that the first square mold plate 300, the second square mold plate 400 and the injection tube head 200 fit tightly together, improving installation stability. The force-distributing limiting method facilitates subsequent switching without effort. At the same time, when it is necessary to disassemble the first square mold plate 300 and the second square mold plate 400, pulling the push plate 842, under the limitation of the second limiting ring 640, the slide plate 840 can be quickly moved. The moving limit tube 600 is displaced, thereby quickly releasing the limit spring 620. After the limit is released, due to the retraction and reset action of the return spring 720, the second limit spring 870 continues to be compressed, causing the first square mold plate 300 to move one end distance and automatically disengage from the injection tube head 200 until the return spring 720 and the second limit spring 870 maintain balance. This rapid and automatic disengagement when the limit is released avoids the problem of the injection tube head 200's insertion tube 320 being unable to be pulled out due to the solidification of residual raw material on the side wall of the injection tube head 200. This facilitates the quick disassembly of the first square mold plate 300 and the second square mold plate 400, and also facilitates the installation of the first square mold plate 300.

[0060] Furthermore, the base 100 is provided with an adapter groove 110, and the bottom of the adapter groove 110 is fixedly connected to an adapter plate 120 by a plurality of adapter springs 130. The adapter plate 120 is slidably connected to the adapter groove 110. The adapter plate 120 is located below the first square mold plate 300 and the second square mold plate 400.

[0061] A limiting plate 631 is fixedly provided at one end of the slide rod 630 away from the second limiting block 610. The limiting plate 631 prevents the slide rod 630 from disengaging from the adjusting plate 530.

[0062] The present invention facilitates the insertion and alignment of the first square mold plate 300 and the second square mold plate 400 through the structural design of the adapter slot 110 and the adapter plate 120. Since the adapter plate 120 is adjustable, it will not obstruct the insertion and positioning of the first square mold plate 300 and the second square mold plate 400, and it is easy to align.

[0063] A method for operating using the aforementioned automotive sealing strip injection mold includes the following steps:

[0064] S1. When producing small-sized sealing strips, both the first square mold plate 300 and the second square mold plate 400 are used simultaneously.

[0065] S2. When switching to the production of large-size sealing strips, the limit spring 620 limits the first square mold plate 300, then cuts the sealing strip and pulls up the second square mold plate 400.

[0066] S3. When switching to the production of small-sized sealing strips, insert the second square mold plate 400 to cut the sealing strip and restore the limit spring 620 to its limit on the second square mold plate 400.

[0067] S4. When it is necessary to disassemble the first square mold plate 300 and the second square mold plate 400, release the limit spring 620 so that the first square mold plate 300 automatically disengages from the injection tube head 200.

[0068] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several improvements and modifications without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. An injection mold for a weather strip for an automobile, characterized by comprising: The utility model provides an injection tube head (200), the end of injection tube head (200) is inserted with first square mould plate (300), one side of first square mould plate (300) is abutted with second square mould plate (400), the middle part of first square mould plate (300) is through and is provided with first die mouth (330), the middle part of second square mould plate (400) is through and is provided with second die mouth (420), the shape of first die mouth (330) and second die mouth (420) is same and the size of first die mouth (330) is greater than the size of second die mouth (420), The first square mould plate (300) and the second square mould plate (400) are inserted on the limiting mechanism, and the centers of the first die mouth (330) and the second die mouth (420) are aligned when the injection tube head (200) is injection molded. The first square mould plate (300) is fixed with a spigot (320) on one side, the spigot (320) is inserted with the end of the injection tube head (200), the bottom of the first square mould plate (300) is symmetrically provided with two first limiting grooves (310), and the bottom is an inclined first inclined surface (340), a positioning horizontal groove (350) is formed on the first limiting groove (310) of the first square mould plate (300) away from the injection tube head (200), the bottom of the second square mould plate (400) is symmetrically provided with two second limiting grooves (410), and the bottom is an inclined second inclined surface (430), a positioning circular groove (440) is formed on the second limiting groove (410) of the second square mould plate (400) away from the first square mould plate (300), The limiting mechanism comprises a limiting rod (700) and a limiting tube (600) sleeved outside the limiting rod (700), a spring box (210) is symmetrically fixed on the side wall of the injection tube head (200), a sliding circular groove (211) is formed at one end of the spring box (210), and the sliding circular groove (211) is in sliding connection with the limiting rod (700), two first limiting blocks (710) are symmetrically fixed on the limiting rod (700), the first limiting blocks (710) are correspondingly matched with the positioning horizontal groove (350), two second limiting blocks (610) are symmetrically fixed at the end of the limiting tube (600), a slide rod (630) is fixedly connected to one side of the second limiting block (610), and a limiting spring (620) is sleeved on the slide rod (630), a base (100) is arranged below the limiting tube (600), a first support (500) and a second support (800) are fixedly installed on the base (100), the slide rod (630) and the limiting tube (600) are in sliding connection with the first support (500), the limiting spring (620) is located between the second limiting block (610) and the first support (500), and one end of the limiting rod (700) is slidingly installed on the second support (800).

2. The injection mold for a weather strip for a vehicle as set forth in claim 1, wherein The length between the outer ends of the two second limiting blocks (610) is adapted to the positioning circular groove (440), and when the two second limiting blocks (610) are arranged transversely, the second limiting blocks (610) are limited on the positioning circular groove (440); when the two second limiting blocks (610) are arranged vertically, the second limiting blocks (610) pass through the second limiting groove (410).

3. The injection mold for a weather strip for a vehicle as set forth in claim 1, wherein A circular through groove (510) is arranged on the first support (500), and a ring groove is arranged on the inner wall of the circular through groove (510); an adjusting groove (520) is arranged on one side of the first support (500), and the adjusting groove is communicated with the ring groove; an adjusting disc (530) is arranged on the circular through groove (510), a limiting ring (531) is fixedly arranged on the side wall of the adjusting disc (530), and the limiting ring (531) is rotationally connected with the ring groove of the circular through groove (510); a first sliding hole (532) and a second sliding hole (533) are arranged on the adjusting disc (530) in a penetrating manner; the first sliding hole (532) is slidably connected with the limiting tube (600), and the second sliding hole (533) is slidably connected with the sliding rod (630); an adjusting rod (540) is fixedly connected with the limiting ring (531) and is arranged outwardly through the adjusting groove (520).

4. The injection mold for a weather strip for a vehicle as set forth in claim 1, wherein The second support (800) comprises a L-shaped folding plate (810), one end of the L-shaped folding plate (810) is fixedly connected with the base (100), a material passing opening (820) is arranged in the middle of the vertical plate of the L-shaped folding plate (810), and supporting rods (860) are fixedly arranged on the two sides of the vertical plate of the L-shaped folding plate (810); the supporting rods (860) are slidably connected with the limiting tube (600), one end of the supporting rod (860) is fixedly connected with one end of the limiting rod (700) through the second limiting spring (870), and the limiting rod (700) in the spring box (210) is sleeved with a reset spring (720), and the two ends of the reset spring (720) are fixedly connected with the end of the limiting rod (700) and the inner wall of one end of the spring box (210) respectively.

5. The injection mold for a weather strip for a vehicle as set forth in claim 4, wherein When the first square mold plate (300) and the second square mold plate (400) are installed in place and the limiting spring (620) limits and fixes the mold plate, the reset spring (720) is in a stretched state, and the second limiting spring (870) is in a compressed state; when the limiting spring (620) is released, the reset spring (720) is reset, and the second limiting spring (870) is continuously compressed.

6. The injection mold for a weather strip for an automobile as set forth in claim 4, wherein The L-shaped folding plate (810) is provided with a sliding groove (811) on both sides of the transverse plate, a sliding plate (840) is slidably connected to the sliding groove (811), the upper end of the sliding plate (840) is fixedly connected with a push plate (842), the lower end of the sliding plate (840) is fixedly connected with a second sliding rod (850), a limiting through groove (841) is provided on the sliding plate (840), the limiting tube (600) is located in the limiting through groove (841), the end of the limiting tube (600) is fixedly provided with a second limiting ring (640), and the bottom of the vertical plate of the L-shaped folding plate (810) is provided with a through hole (830) on both sides.

7. The injection mold for a weather strip for an automobile as set forth in claim 1, wherein The base (100) is provided with an adaptive groove (110), the bottom of the adaptive groove (110) is fixedly connected with an adaptive plate (120) through a plurality of adaptive springs (130), and the adaptive plate (120) is slidably connected with the adaptive groove (110). The sliding rod (630) is fixedly provided with a limiting disc (631) at one end away from the second limiting block (610).

8. A method of operating the injection mold for a vehicle weather strip according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: S1, when producing a small-size sealing strip, the first square mold plate (300) and the second square mold plate (400) are used at the same time; S2, when switching to produce a large-size sealing strip, the limiting spring (620) limits the first square mold plate (300), then the sealing strip is cut off, and the second square mold plate (400) is pulled up; S3, when switching to produce a small-size sealing strip, the second square mold plate (400) is inserted downward to cut off the sealing strip, and the limiting spring (620) is restored to limit the second square mold plate (400); S4, when the first square mold plate (300) and the second square mold plate (400) need to be disassembled, the limiting of the limiting spring (620) is released, and the first square mold plate (300) is automatically separated from the injection tube head (200).

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