A high-efficiency zipper injection molding machine and its injection molding process

Abstract

The present invention discloses a high-efficiency zipper injection molding machine and its injection molding process, which belongs to the field of zipper injection molding technology. The machine comprises a workbench, an injection molding main unit and a conveying device. The injection molding main unit comprises a lower template, an upper template and a driving mechanism. The driving mechanism is provided with at least two injection molding devices including independent hoppers and output ends. The output ends of the injection molding devices are connected to the mold cavity between the upper template and the lower template. The conveying device comprises a first traction assembly, a second traction assembly and a power assembly, which is powered by the power assembly. The second traction assembly comprises a base, a main sprocket, a winding sprocket, a chain and a driving wheel. The chain is wound on the main sprocket and the winding sprocket, the chain is fixed to the first traction assembly, and the driving wheel is connected to the main sprocket via a one-way bearing transmission. Through the two injection molding devices, the output end spacing is reasonably configured to improve the uniformity of the finished product of the injection-molded zipper. The two hoppers are configured to improve the conveying efficiency and production efficiency of the molten material.

Description

Technical Field

[0001] The invention belongs to the technical field of zipper injection molding, and particularly relates to a high-efficiency zipper injection molding machine and an injection molding process thereof. Background Art

[0002] Zippers are divided into three main categories based on their material: metal, nylon, and resin. Metal zippers are made by processing copper or aluminum wire through a thread-forming machine; nylon zippers are made by wrapping nylon monofilament around a central wire through a heated die; and resin zippers are made by injecting polyester plastic using a dye-matched color. With rising living standards, people's expectations for zipper quality are also increasing. Resin zippers, among others, offer lower production costs, greater durability, and are suitable for a wide range of applications. Therefore, the demand for injection molding machines for producing resin zippers is particularly important.

[0003] In the prior art, a zipper injection molding machine is usually composed of an injection main unit, a mold clamping device, and a conveying device. During the working cycle of the injection molding machine to form a zipper, the plastic needs to be heated to form a molten glue, injected into the mold cavity for shaping and cooling, and finally discharged for collection. However, in the production practice of zipper injection molding machines, the following problems still exist: (1) Traditional zipper injection molding machines usually only include one set of injection molding devices, which has low production efficiency, and the plastic is not uniform when it forms a molten glue and cools, resulting in poor quality of the finished zipper; (2) Traditional zipper injection molding machines can only produce single-color zippers. To produce multi-color zippers, multiple injection molding machines and multiple sets of injection molds are required, which has high production equipment costs and poor economic benefits; (3) The conveying device of the traditional zipper injection molding machine is driven by multiple motors. When clamping and conveying the zipper, the synchronization is poor, which easily causes the zipper to break.

[0004] Therefore, in view of the problems existing in the prior art, it is urgent to provide a high-efficiency zipper injection molding machine and an injection molding process thereof. Summary of the Invention

[0005] In view of the problems in the related art, the present invention proposes a high-efficiency zipper injection molding machine and an injection molding process thereof to overcome the above-mentioned technical problems existing in the existing related art.

[0006] The technical solution of the present invention is achieved as follows: a high-efficiency zipper injection molding machine is used to inject molten material between the left and right chain belts and solidify it to form an injection-molded zipper, including a workbench, an injection molding main unit and a conveying device arranged on the workbench, the injection molding main unit including a lower template, an upper template arranged above the lower template, and a driving mechanism that drives the upper template to move toward the lower template for injection molding, the driving mechanism is provided with an injection molding device, the injection molding device including a hopper, a motor, an injection cylinder, a lifting cylinder, an injection plastic pipe and a screw arranged in the injection plastic pipe,

[0007] The driving mechanism is provided with at least two injection molding devices, each of which is provided with an independent hopper and an injection plastic pipe. An input end is provided on one side of the upper portion of the injection plastic pipe, and the input end is connected to the hopper. An output end is provided at the lower portion of the injection plastic pipe. A mold cavity is formed between the upper template and the lower template, and the output end of each injection molding device is connected to the mold cavity.

[0008] The conveying device is used to discharge the solidified injection-molded zipper and collect the material, comprising a first traction assembly, a second traction assembly and a power assembly, wherein the first traction assembly is in transmission connection with the power assembly and the first traction assembly slides back and forth along the extension direction of the workbench, and the first traction assembly has a clamping state and a loosening state;

[0009] The second traction assembly includes a base, a main sprocket, a winding sprocket, a chain and a driving wheel. The main sprocket, the winding sprocket and the chain are located on one side of the workbench. The chain is wound around the main sprocket and the winding sprocket. Several links of the chain are fixed to the first traction assembly. The base is located at the rear end of the first traction assembly. The driving wheel is rotatably connected to the base. The driving wheel and the main sprocket are connected through a one-way bearing.

[0010] In the present invention, by setting up two injection molding devices and configuring two hoppers, on the one hand, the efficiency of conveying the molten material is improved, and the production efficiency of the zipper injection molding machine is greatly enhanced; on the other hand, with the help of two independently set injection molding devices and their respective injection molding pipes, it is convenient to produce multi-color injection molded zippers without the need to set up multiple injection molding machines and multiple sets of injection molds, saving production equipment costs and greatly improving economic benefits.

[0011] Preferably, the front end of the zipper injection molding machine is further provided with a buffer device for guiding the left and right chain belts into the mold cavity, including a bracket, a plurality of guide rollers, a left swing rod and a right swing rod.

[0012] The guide rollers are arranged on the bracket in a manner of being axially fixed and circumferentially rotating, and each guide roller is provided with a left clamping groove and a right clamping groove;

[0013] The left swing arm and the right swing arm are correspondingly provided with the left card slot and the right card slot, and are respectively rotatably connected to the bracket around a fulcrum. The end of the left swing arm / right swing arm away from the fulcrum has a ring portion. The left chain belt / right chain belt passes through the ring portion after passing through a plurality of guide rollers and is transported to the mold cavity.

[0014] It should be noted that a buffer device is provided to facilitate the adjustment of the surface tension of the left chain belt / right chain belt conveyed to the mold cavity: specifically, the left chain belt / right chain belt is passed through the ring portion of the left rocker arm / right rocker arm respectively, so that the left chain belt / right chain belt passing through the ring portion is pulled back under the action of the gravity of the left rocker arm / right rocker arm to achieve tension balance, thereby improving the smoothness of conveying the left chain belt / right chain belt to the mold cavity and achieving better zipper injection molding efficiency.

[0015] Further preferably, the number of the injection molding devices is 2, the motor is connected to the screw transmission, the lifting cylinder is used to drive the upper template to move toward the side close to the lower template, so that the output end of the injection plastic tube enters the gate of the mold cavity, and the injection cylinder is used to drive the molten material into the mold cavity. The motor, injection cylinder, lifting cylinder, and injection plastic tube are respectively connected to the seat plate support through corresponding guide columns.

[0016] Further preferably, the distance between the output ends of the two injection-molded plastic pipes ranges from 180 mm to 280 mm;

[0017] In order to improve the quality of injection-molded zippers, two injection molding devices are further set up, and the output end spacing between the two injection molding devices is reasonably configured. Compared with the single output end mode of a single set of injection molding devices, the dual output end mode with a certain spacing distribution makes the flow rate of the molten material filling the entire mold cavity faster, greatly shortens the solidification time of the injection molding molten material, and effectively improves the uniformity of the finished product of the injection-molded zipper.

[0018] Preferably, the power assembly includes a motor, a screw rod, a square nut and guide rods distributed on the left and right sides of the screw rod. The central axis of the screw rod is consistent with the extension direction of the workbench and is rotatably connected to the workbench. The motor is drive-connected to the screw rod, the square nut is transmission-connected to the screw rod and forms a sliding connection with the left and right guide rods. The square nut is fixedly connected to the first traction assembly.

[0019] Preferably, the power assembly includes a motor, a screw rod, a square nut and a slide seat, the slide seat abuts against the end face of the square nut to form a sliding connection, the central axis of the screw rod is consistent with the extension direction of the workbench and is rotationally connected to the workbench, the motor is drive-connected to the screw rod, the square nut is transmission-connected to the screw rod, and the square nut is fixedly connected to the first traction assembly.

[0020] Further preferably, the first traction assembly includes a concave frame, a first cylinder and a pressure plate, the concave frame having a cavity with an upward opening, the first cylinder being arranged in the cavity in a manner that a telescopic rod is vertically extended upward, a top plate being provided at the end of the telescopic rod of the first cylinder, a pressure plate being further provided at the cavity opening of the concave frame, a notch being provided in the middle of the pressure plate running through the front and back, and a gap being formed between the pressure plate and the top plate for the zipper to pass through;

[0021] It should be noted that the first traction assembly has a clamping state and a loosening state. By providing a first cylinder, cooperating with a pressure plate and a top plate, the first traction assembly can be quickly switched between the clamping state and the loosening state. The structure is simple, stable and reliable.

[0022] At the same time, the grooves running through the front and back of the pressure plate, on the one hand, facilitate avoiding the pouring column of the formed zipper, and on the other hand, when the pouring column passes through the grooves, it also realizes the positioning of the formed zipper by the first traction group component, which is efficient and fast.

[0023] Further preferably, a splitting assembly is provided between the first pulling assembly and the base, for splitting the zipper into a left chain and a right chain, comprising a bottom plate and a cover plate, wherein a channel for the zipper to pass through is formed between the bottom plate and the cover plate, and a through groove corresponding to the notch and running through the front and back is provided on the central axis of the cover plate;

[0024] Two splitting blades are further provided on a side of the central axis of the bottom plate away from the first traction assembly, and the blades of the two splitting blades are distributed in a front-to-back spacing;

[0025] It should be noted that after the zipper is consolidated and formed and then clamped and conveyed by the first traction component, it needs to be split and the chain bones are removed. The chain bones are the connecting parts that consolidate the left chain and the right chain. The blades with front and rear spacing are set to balance the force during the zipper transportation process, greatly improving the efficiency of chain bone removal. At the same time, it can also prevent the zipper from deviating when passing through the driving wheel, thereby achieving the purpose of continuous and stable material collection.

[0026] Preferably, the second traction assembly further comprises a second cylinder, the second cylinder being arranged on the base in a manner of a telescopic rod extending vertically downward, a fork frame being provided at the lower portion of the telescopic rod of the second cylinder, a left driven wheel and a right driven wheel being provided on the left and right sides of the fork frame respectively, the left driven wheel / right driven wheel being in contact with or separated from the driving wheel;

[0027] In order to improve the conveying stability of the driving wheel, a second cylinder is further provided to drive the left driven wheel / right driven wheel to counteract the driving wheel, apply pre-tightening force to the left chain / right chain of the zipper on the driving wheel, increase the friction between the left chain / right chain and the driving wheel, and ensure continuous material collection of the left chain / right chain.

[0028] Preferably, a clutch is provided between the driving wheel and the main sprocket.

[0029] When the first traction assembly moves toward a side away from the injection molding machine, the chain connected to the first traction assembly drives the main sprocket to rotate, thereby driving the driving wheel to rotate;

[0030] When the first traction assembly moves toward the side close to the injection molding machine, the chain connected to the first traction assembly drives the main sprocket to rotate, and the driving wheel stops rotating under the action of the clutch and the one-way bearing.

[0031] It should be noted that, by setting a single motor in the conveying device, driving the first traction component to reciprocate along the workbench, driving the chain to operate, and combining the clutch and the one-way bearing, the technical effect of driving the driving wheel to rotate when the main sprocket rotates forward and stopping the driving wheel when it rotates reversely is achieved. While the first traction component clamps the zipper for transportation, the driving wheel of the second traction component operates synchronously with high synchronization, avoiding unexpected situations such as pulling and breaking the belt during the zipper transportation process; further, only a single motor is needed to drive the conveying device, which reduces the production cost of the injection molding machine and facilitates the production and manufacturing of the injection molding machine.

[0032] A high-efficiency injection molding process uses the zipper injection molding machine described above, and the steps of the injection molding process are as follows:

[0033] Step 1: Add granular or powdered plastic into the two hoppers. The plastic enters the injection molding tube through the input port and is transformed into a molten plastic by the rotation of the screw and the heating of the injection molding machine.

[0034] Step 2: The lifting cylinders of the two injection molding devices then synchronously drive the upper mold plate to close the mold with the lower mold plate, and move the two injection molding pipes forward so that the two output ends enter the gate of the mold;

[0035] Step 3: Then, pressurized oil is introduced into the two injection cylinders simultaneously, so that the two screws are pushed forward, thereby injecting the molten material into the closed mold cavity with a lower temperature at a high pressure and a relatively fast speed, maintaining the pressure and cooling it to solidify and form it;

[0036] Step 4: The upper mold plate moves upward, and the conveyor pulls out the injection-molded zipper product. Simultaneously, the left and right chain belts are continuously conveyed into the mold cavity for the next injection molding process.

[0037] Beneficial effects of the present invention:

[0038] (1) By setting up two injection molding devices and rationally configuring the output end spacing between the two injection molding devices, the uniformity of the finished injection-molded zipper is improved; at the same time, two hoppers are configured to improve the conveying efficiency of the molten material, greatly enhancing the production efficiency of the zipper injection molding machine;

[0039] (2) With the help of two independently set injection molding devices and their respective injection molding tubes, it is convenient to produce multi-color injection molding zippers without the need to set up multiple injection molding machines and multiple sets of injection molds, thus saving production equipment costs and improving economic benefits;

[0040] (3) The transmission device is driven by a single motor with high synchronization, which avoids the zipper from being pulled and broken during the conveying process, reduces the production cost of the injection molding machine, and improves the manufacturing efficiency of the injection molding machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a structural schematic diagram of the present invention;

[0042] Figure 2 It is a structural schematic diagram of the buffer device of the present invention;

[0043] Figure 3 It is a working principle diagram of the injection molding device of the present invention;

[0044] Figure 4 Schematic diagram of the structure of the mold cavity of the present invention;

[0045] Figure 5 is an axonometric view of the conveying device of the present invention;

[0046] Figure 6 is an axonometric view of the conveying device of the present invention from another perspective;

[0047] Figure 7 for Figure 6 A local enlarged view of point a;

[0048] Figure 8 for Figure 6 A local enlarged view of point b;

[0049] Figure 9 is a cross-sectional view of a conveying device of the present invention;

[0050] Figure 10 is a structural schematic diagram of the second traction assembly of the present invention;

[0051] Reference numerals:

[0052] L1, left chain; L2, right chain;

[0053] 1. Workbench;

[0054] 2. Buffer device; 21. Bracket; 22. Guide roller; 221. Left card slot; 222. Right card slot; 231. Left swing arm; 232. Right swing arm; 233. Ring;

[0055] 3. Injection molding machine; 31. Injection molding device; 311. Motor; 312. Injection cylinder; 313. Hopper; 314. Screw; 315. Injection molding pipe; 316. Lifting cylinder; R1, input port; C1, output port; 32. Upper mold plate; 33. Lower mold plate; 34. Mold cavity; 35. Guide pillar; 36. Base plate; 37. Mold guide shaft; J1, sprue;

[0056] 4. Conveying device; 41. First traction assembly; 411. Pressing plate; 4111. Notch; 412. Concave frame; 4121. Cavity; 413. Top plate; 414. First cylinder; 42. Second traction assembly; 421. Base; 422. Chain; 4221. Connecting plate; 423. Winding sprocket; 424. Main sprocket; 425. Driving wheel; 426. Second cylinder; 427. Fork frame; 4271. Left driven wheel; 4272. Right driven wheel; 428. One-way bearing; 429. Clutch; 43. Power assembly; 431. Motor; 432. Screw rod; 433. Square nut; 44. Splitting assembly; 441. Splitting blade; 442. Through slot; 451. First proximity switch; 452. Second proximity switch. DETAILED DESCRIPTION

[0057] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0058] Example 1

[0059] like Figures 1-10 As shown, a high-efficiency zipper injection molding machine is used to inject molten material between the left link L1 and the right link L2 and solidify it to form an injection-molded zipper, including a workbench 1, and an injection molding main unit 3 and a conveying device 4 arranged on the workbench 1. The injection molding main unit 3 includes a lower template 33, an upper template 32 arranged above the lower template 33, and a driving mechanism for driving the upper template 32 to move toward the lower template 33 for injection molding. The driving mechanism is provided with an injection molding device 31, and the injection molding device 31 includes a hopper 313, a motor 311, an injection cylinder 312, a lifting cylinder 316, an injection plastic pipe 315 and a screw 314 arranged in the injection plastic pipe 315.

[0060] In this embodiment, the front end of the zipper injection molding machine is further provided with a buffer device 2 for guiding the left and right link belts L1 and L2 into the mold cavity 34, including a bracket 21, a plurality of guide rollers 22, a left swing rod 231 and a right swing rod 232.

[0061] The guide rollers 22 are arranged on the bracket 21 in an axially fixed and circumferentially rotatable manner, and each guide roller 22 is provided with a left card slot 221 and a right card slot 222;

[0062] The left swing link 231 and the right swing link 232 are provided corresponding to the left and right slots 221 and 222, and are respectively connected to the bracket 21 for rotation around a fulcrum. The left and right swing links 231 and 232 have a ring portion 233 at one end away from the fulcrum. The left and right link belts L1 and L2, after passing through a plurality of guide rollers 22, pass through the ring portion 233 and are transported to the mold cavity 34.

[0063] It should be noted that the buffer device 2 is provided to facilitate the adjustment of the surface tension of the left link L1 / right link L2 delivered to the mold cavity 34: specifically, the left link L1 / right link L2 is passed through the ring portion 233 of the left rocker arm 231 / right rocker arm 232 respectively, so that the left link L1 / right link L2 passing through the ring portion 233 is pulled back under the action of the gravity of the left rocker arm 231 / right rocker arm 232 to achieve tension balance, thereby improving the smoothness of the left link L1 / right link L2 being delivered to the mold cavity 34 and achieving better zipper injection molding efficiency.

[0064] The drive mechanism is provided with at least two injection molding devices 31, each of which is provided with an independent hopper 313 and an injection molding tube 315. An input end R1 is provided on one side of the upper portion of the injection molding tube 315, and the input end R1 is connected to the hopper 313. An output end C1 is provided at the lower portion of the injection molding tube 315. A mold cavity 34 is formed between the upper mold plate 32 and the lower mold plate 33, and the output end C1 of each injection molding device 31 is connected to the mold cavity 34.

[0065] In this embodiment, there are two injection molding devices 31. The motor 311 is in transmission connection with the screw 314. The lifting cylinder 316 is used to drive the upper mold plate 32 to move toward the side close to the lower mold plate 33, so that the output end C1 of the injection molding tube 315 enters the gate of the mold cavity 34. The injection cylinder 312 is used to drive the molten material into the mold cavity 34. The motor 311, injection cylinder 312, lifting cylinder 316, and injection molding tube 315 are respectively supported and connected to the base plate 36 through corresponding guide pillars 35.

[0066] Furthermore, the distance between the output ends C1 of the two injection-molded plastic pipes 315 ranges from 180 mm to 280 mm.

[0067] In order to improve the quality of the injection-molded zipper, two injection molding devices 31 are further provided, and the distance between the output ends C1 of the two injection molding devices 31 is reasonably configured. Compared with the single output end C1 mode of a single set of injection molding devices 31, the dual output end C1 mode with a certain spacing distribution makes the flow rate of the molten material filling the entire mold cavity 34 faster, greatly shortens the solidification time of the injection molding molten material, and effectively improves the uniformity of the finished product of the injection-molded zipper.

[0068] The conveying device 4 is used to discharge and collect the solidified injection-molded zipper, and includes a first traction component 41, a second traction component 42 and a power component 43. In this embodiment, the power component 43 includes a motor 431, a screw rod 432, a square nut 433 and guide rods (not shown) distributed on the left and right sides of the screw rod 432. The central axis of the screw rod 432 is consistent with the extension direction of the workbench 1 and is rotatably connected to the workbench 1. The motor 431 is drive-connected to the screw rod 432, and the square nut 433 is transmission-connected to the screw rod 432 and forms a sliding connection with the left and right guide rods. The square nut 433 is fixedly connected to the first traction component 41.

[0069] The first traction assembly 41 is in transmission connection with the power assembly 43, and the first traction assembly 41 slides back and forth along the extension direction of the workbench 1. The first traction assembly 41 has a clamping state and a loose state. In this embodiment, the workbench 1 is further provided with a first proximity switch 451 and a second proximity switch 452 for determining front and rear defined positions of the first traction assembly 41 when it slides back and forth in the extension direction of the workbench 1.

[0070] Specifically, the first traction assembly 41 includes a concave frame 412, a first cylinder 414, and a pressure plate 411. The concave frame 412 has a cavity 4121 with an upward opening. The first cylinder 414 is arranged in the cavity 4121 in a manner that a telescopic rod is vertically extended upward. A top plate 413 is provided at the end of the telescopic rod of the first cylinder 414. A pressure plate 411 is further provided at the opening of the cavity 4121 of the concave frame 412. A notch 4111 is provided in the middle of the pressure plate 411, which runs through the front and back. A gap is formed between the pressure plate 411 and the top plate 413 for the zipper to pass through.

[0071] It should be noted that the first pulling assembly 41 has a clamping state and a releasing state. By providing a first cylinder 414, in conjunction with the pressure plate 411 and the top plate 413, the first pulling assembly can be quickly switched between the clamping state and the releasing state. The structure is simple, stable and reliable.

[0072] At the same time, the groove 4111 running through the front and back of the pressure plate 411, on the one hand, facilitates avoiding the pouring column of the molded zipper, and on the other hand, when the pouring column passes through the groove 4111, it also realizes the positioning of the molded zipper by the first traction group component, which is efficient and fast.

[0073] The second traction assembly 42 includes a base 421, a main sprocket 424, a winding sprocket 423, a chain 422 and a driving wheel 425. The main sprocket 424, the winding sprocket 423 and the chain 422 are located on one side of the workbench 1. The chain 422 is wound around the main sprocket 424 and the winding sprocket 423. Several links of the chain 422 are fixed to the first traction assembly 41. Specifically, the chain 422 is fixed to the first traction assembly 41 through a connecting plate 4221. The base 421 is located at the rear end of the first traction assembly 41. The driving wheel 425 is rotatably connected to the base 421. The driving wheel 425 and the main sprocket 424 are connected to each other through a one-way bearing 428.

[0074] In this embodiment, the second traction assembly 42 further includes a second cylinder 426. The second cylinder 426 is disposed on the base 421 in the form of a telescopic rod that extends vertically downward. A fork frame 427 is disposed at the lower portion of the telescopic rod of the second cylinder 426. A left driven wheel 4271 and a right driven wheel 4272 are disposed on the left and right sides of the fork frame 427, respectively. The left driven wheel 4271 and the right driven wheel 4272 are in contact with or separated from the driving wheel 425.

[0075] In order to improve the conveying stability of the driving wheel 425, a second cylinder 426 is further provided to drive the left driven wheel 4271 / right driven wheel 4272 to counteract the driving wheel 425, apply a pre-tightening force to the left chain / right chain of the zipper on the driving wheel 425, increase the friction between the left chain / right chain and the driving wheel 425, and ensure continuous material collection of the left chain / right chain.

[0076] Furthermore, a clutch 429 is provided between the driving wheel 425 and the main sprocket 424.

[0077] When the first traction component 41 moves toward a side away from the injection molding machine 3, the chain 422 connected to the first traction component 41 drives the main sprocket 424 to rotate, driving the driving wheel 425 to rotate;

[0078] When the first traction assembly 41 moves toward the side close to the injection molding machine 3, the chain 422 fixed to the first traction assembly 41 drives the main sprocket 424 to rotate, and the driving wheel 425 stops rotating under the action of the clutch 429 and the one-way bearing 428. Specifically, the main sprocket 424 is rotatably connected to the base 421 through the one-way bearing 428. When the chain 422 drives the main sprocket 424 to rotate forward, the one-way bearing 428 drives the driving wheel 425 to rotate forward; when the chain 422 drives the main sprocket 424 to rotate reversely, the resistance torque of the one-way bearing 428 increases, interacting with the clutch 429, so that the driving wheel 425 stops rotating.

[0079] It should be noted that, by setting a single motor 431 in the conveying device 4, the first traction component 41 is driven to reciprocate along the workbench 1, driving the chain 422 to operate, and combining the clutch 429 and the one-way bearing 428, the technical effect of driving the driving wheel 425 to rotate when the main sprocket 424 rotates forward and stopping the driving wheel 425 when it rotates reversely is achieved. While the first traction component 41 clamps the zipper for transportation, the driving wheel 425 of the second traction component 42 operates synchronously with high synchronization, avoiding unexpected situations such as pulling and breaking the belt during the zipper transportation process; further, only a single motor 431 is needed to drive the conveying device 4, which reduces the production cost of the injection molding machine and facilitates the production and manufacturing of the injection molding machine.

[0080] In this embodiment, by setting up two injection molding devices 31 and configuring two hoppers 313, on the one hand, the transportation efficiency of the molten material is improved, and the production efficiency of the zipper injection molding machine is greatly enhanced; on the other hand, with the help of the two independently set injection molding devices 31 and their respective injection molding pipes 315, it is convenient to produce multi-color injection molded zippers without the need to set up multiple injection molding machines and multiple sets of injection molds, saving production equipment costs and greatly improving economic benefits.

[0081] In a preferred embodiment, a splitting assembly 44 is provided between the first pulling assembly 41 and the base 421 for splitting the zipper into a left chain and a right chain. The splitting assembly 44 comprises a bottom plate and a cover plate. A passage for the zipper to pass through is formed between the bottom plate and the cover plate. A through groove 442 corresponding to the notch 4111 and running through the front and back of the cover plate is provided on the central axis of the cover plate.

[0082] Two splitting blades 441 are further provided on the side of the central axis of the bottom plate away from the first traction assembly 41, and the blades of the two splitting blades 441 are distributed in a front-to-back spacing;

[0083] It should be noted that after the zipper is consolidated and formed and clamped and conveyed by the first traction component 41, it needs to be split and the chain bones are removed. The chain bones are the connecting parts that consolidate the left chain and the right chain. The blades with front and rear spacing are set to balance the force during the zipper transportation process, greatly improving the efficiency of chain bone removal. At the same time, it can also prevent the zipper from deviating when passing through the driving wheel 425, thereby achieving the purpose of continuous and stable material collection.

[0084] Through the above scheme of this embodiment, in specific application: a high-efficiency zipper injection molding machine, when started, the left link L1 and the right link L2 are introduced through the buffer device 2 provided at the front end of the injection molding main body 3, specifically: the left link L1 / the right link L2 correspondingly bypass the left card slot 221 / the right card slot 222 of the plurality of guide rollers 22, and pass through the loop portion 233, so that the left link L1 / the right link L2 passing through the loop portion 233 is pulled back under the action of the gravity of the left swing rod 231 / the right swing rod 232, achieving tension balance, thereby improving the smoothness of the left link L1 / the right link L2 being conveyed to the mold cavity 34, and then the left link L1 / the right link L2 is conveyed to the mold cavity 34;

[0085] After the left chain belt L1 / right chain belt L2 enters the mold cavity 34, the injection molding machine 3 injects molten glue into the mold cavity 34. The specific injection molding process steps are as follows:

[0086] Step 1: Add granular or powdered plastic into the two hoppers 313. The plastic enters the injection molding pipe 315 through the input port and is transformed into a molten plastic by the rotation of the screw 314 and the heating of the injection molding machine 3.

[0087] Step 2: The lifting cylinders 316 of the two injection molding devices 31 then synchronously drive the upper mold plate 32 to close the mold with the lower mold plate 33, and move the two injection molding pipes 315 forward so that the two output ends C1 enter the gate of the mold;

[0088] Step 3: Then, pressurized oil is simultaneously introduced into the two injection cylinders 312 to propel the two screws 314 forward, thereby injecting the molten material into the closed mold cavity 34 at a relatively low temperature at a high pressure and a relatively fast speed, maintaining the pressure and cooling it to solidify and form it;

[0089] Step 4: The upper mold plate 32 moves upward, and the conveying device 4 pulls out the injection-molded zipper product. Simultaneously, the left link L1 and the right link L2 are continuously conveyed into the mold cavity 34 for the next injection molding process.

[0090] The first traction assembly 41 is in the defined position of the first proximity switch 451 and maintains a clamping state. Specifically, the first cylinder 414 of the first traction assembly 41 drives the top plate 413 to move upward, and together with the pressure plate 411, clamps the injection-molded zipper after solidification and molding, and translates the injection-molded zipper along the workbench 1 toward the side away from the injection molding machine 3, and stops after moving to the defined position of the second proximity switch 452. Synchronously, the chain 422 fixed to the first traction assembly 41 drives the main sprocket 424 to rotate under the drive of the first traction assembly 41, so that the driving wheel 425 drivingly connected to the main sprocket 424 rotates;

[0091] At this time, the solidified injection-molded zipper product is divided by the dividing assembly 44, and the chain bones are removed to form the left and right chains of the zipper. The left and right chains are then driven by the driving wheel 425 and the left driven wheel 4271 and the right driven wheel 4272 to complete the material collection.

[0092] Then, the first cylinder 414 of the first traction assembly 41 drives the top plate 413 to move downward, enters a relaxed state, stops clamping the zipper, and the first traction assembly 41 slides along the workbench 1 toward the side close to the injection molding main unit 3 to the defined position of the first proximity switch 451. At this time, the chain 422 fixed to the first traction assembly 41 drives the main sprocket 424 to rotate, and the driving wheel 425 stops rotating under the action of the clutch 429 and the one-way bearing 428. This achieves the technical effect of driving the driving wheel 425 to rotate when the main sprocket 424 rotates forward and stopping the driving wheel 425 when it rotates reversely. This ensures that when the first traction assembly 41 moves to the defined position of the first proximity switch 451, the injection molding zipper will not be reversely transported by the driving wheel 425.

[0093] While the first traction assembly 41 clamps the zipper for transportation, the driving wheel 425 of the second traction assembly 42 rotates synchronously with the zipper, and the synchronization is high, thereby avoiding accidents such as the zipper being pulled and broken during transportation.

[0094] Example 2

[0095] One of the embodiments of the present invention, the main technical solution of this embodiment is the same as that of Example 1. The features not explained in this embodiment are explained in Example 1 and will not be repeated here. The difference between this embodiment and Example 1 is:

[0096] The power assembly 43 includes a motor 431, a screw rod 432, a square nut 433 and a slide (not shown in the figure). The slide abuts against the end face of the square nut 433 to form a sliding connection. The central axis of the screw rod 432 is consistent with the extension direction of the workbench 1 and is rotationally connected to the workbench 1. The motor 431 is drive-connected to the screw rod 432, the square nut 433 is transmission-connected to the screw rod 432, and the square nut 433 is fixedly connected to the first traction assembly 41.

[0097] Based on the disclosure and teachings of the above description, those skilled in the art may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and any modifications and variations of the invention should also fall within the scope of protection of the claims of the present invention. In addition, although certain specific terms are used in this description, these terms are for convenience of description only and do not constitute any limitation to the present invention.

Claims

1. A high-efficiency zipper injection molding machine, used for injecting molten material between a left and right zipper belt and consolidating it to form an injection-molded zipper, comprising a workbench, an injection molding machine disposed on the workbench, and a conveyor device. The injection molding machine comprises a lower mold plate, an upper mold plate disposed above the lower mold plate, and a drive mechanism for driving the upper mold plate toward the lower mold plate for injection molding. The drive mechanism is provided with an injection molding device, which includes a hopper, a motor, an injection cylinder, a lifting cylinder, an injection molding pipe, and a screw disposed within the injection molding pipe. The machine is characterized in that: The driving mechanism is provided with at least two injection molding devices, each of which is provided with an independent hopper and an injection plastic pipe. An input end is provided on one side of the upper portion of the injection plastic pipe, and the input end is connected to the hopper. An output end is provided at the lower portion of the injection plastic pipe. A mold cavity is formed between the upper template and the lower template, and the output end of each injection molding device is connected to the mold cavity. The conveying device is used to discharge the solidified injection-molded zipper and collect the material, comprising a first traction assembly, a second traction assembly and a power assembly, wherein the first traction assembly is in transmission connection with the power assembly and the first traction assembly slides back and forth along the extension direction of the workbench, and the first traction assembly has a clamping state and a loosening state; The second traction assembly includes a base, a main sprocket, a winding sprocket, a chain and a driving wheel. The main sprocket, the winding sprocket and the chain are located on one side of the workbench. The chain is wound around the main sprocket and the winding sprocket. Several links of the chain are fixed to the first traction assembly. The base is located at the rear end of the first traction assembly. The driving wheel is rotatably connected to the base. The driving wheel and the main sprocket are connected through a one-way bearing.

2. The zipper injection molding machine according to claim 1, characterized in that: The front end of the zipper injection molding machine is also provided with a buffer device for guiding the left and right chain belts into the mold cavity, including a bracket, a plurality of guide rollers, a left swing rod and a right swing rod. The guide rollers are arranged on the bracket in a manner of being axially fixed and circumferentially rotating, and each guide roller is provided with a left clamping groove and a right clamping groove; The left swing arm and the right swing arm are arranged corresponding to the left card slot and the right card slot, and are respectively connected to the bracket for rotation around a fulcrum. The left swing arm / right swing arm has a ring portion at one end away from the fulcrum. After the left chain belt / right chain belt passes around several guide rollers, it passes through the ring portion and is transported to the mold cavity.

3. The zipper injection molding machine according to claim 2, characterized in that: There are two injection molding devices, the motor is connected to the screw transmission, the lifting cylinder is used to drive the upper template to move toward the side close to the lower template, so that the output end of the injection plastic tube enters the gate of the mold cavity, and the injection cylinder is used to drive the molten material into the mold cavity. The motor, injection cylinder, lifting cylinder, and injection plastic tube are respectively connected to the seat plate support through corresponding guide columns.

4. The zipper injection molding machine according to claim 3, characterized in that: The distance between the output ends of the two injection-molded plastic pipes ranges from 180 mm to 280 mm.

5. The zipper injection molding machine according to claim 4, characterized in that: The power assembly includes a motor, a screw, a square nut, and guide rods distributed on the left and right sides of the screw, the central axis of the screw is consistent with the extension direction of the workbench, and is rotatably connected to the workbench, the motor is drivingly connected to the screw, the square nut is transmission-connected to the screw, and forms a sliding connection with the left and right guide rods, and the square nut is fixedly connected to the first traction assembly; Alternatively, the power assembly includes a motor, a screw rod, a square nut and a slide, the slide rod abuts against the end face of the square nut to form a sliding connection, the central axis of the screw rod is consistent with the extension direction of the workbench, and is rotationally connected to the workbench, the motor is drive-connected to the screw rod, the square nut is transmission-connected to the screw rod, and the square nut is fixedly connected to the first traction assembly.

6. The zipper injection molding machine according to claim 5, characterized in that: The first traction assembly includes a concave frame, a first cylinder and a pressure plate. The concave frame has a cavity with an upward opening. The first cylinder is arranged in the cavity in the form of a telescopic rod that is vertically telescopic and upward. A top plate is provided at the end of the telescopic rod of the first cylinder. A pressure plate is also provided at the opening of the cavity of the concave frame. A notch is provided in the middle of the pressure plate, and a gap is formed between the pressure plate and the top plate for the zipper to pass through.

7. The zipper injection molding machine according to claim 6, characterized in that: A splitting assembly is provided between the first pulling assembly and the base, for splitting the zipper into a left chain and a right chain, comprising a bottom plate and a cover plate, wherein a passage for the zipper to pass through is formed between the bottom plate and the cover plate, and a through groove corresponding to the notch and running through the front and back is provided on the central axis of the cover plate; Two splitting blades are further provided on a side of the central axis of the bottom plate away from the first traction assembly, and the cutting edges of the two splitting blades are distributed at a front-to-back interval.

8. The zipper injection molding machine according to claim 7, characterized in that: The second traction assembly also includes a second cylinder, which is arranged on the base in a manner that the telescopic rod is vertically extended downward. A fork frame is provided at the lower part of the telescopic rod of the second cylinder, and a left driven wheel and a right driven wheel are provided on the left and right sides of the fork frame respectively. The left driven wheel / right driven wheel is against or separated from the driving wheel.

9. The zipper injection molding machine according to claim 8, characterized in that: A clutch is also provided between the driving wheel and the main sprocket. When the first traction assembly moves toward a side away from the injection molding machine, the chain connected to the first traction assembly drives the main sprocket to rotate, thereby driving the driving wheel to rotate; When the first traction assembly moves toward the side close to the injection molding machine, the chain connected to the first traction assembly drives the main sprocket to rotate, and the driving wheel stops rotating under the action of the clutch and the one-way bearing.

10. A high-efficiency injection molding process, characterized in that: Using the zipper injection molding machine according to any one of claims 1 to 9, the steps of the injection molding process are as follows: Step 1: Add granular or powdered plastic into the two hoppers. The plastic enters the injection molding tube through the input port and is transformed into a molten plastic by the rotation of the screw and the heating of the injection molding machine. Step 2: The lifting cylinders of the two injection molding devices then synchronously drive the upper mold plate to close the mold with the lower mold plate, and move the two injection molding pipes forward so that the two output ends enter the gate of the mold; Step 3: Then, pressurized oil is introduced into the two injection cylinders simultaneously, so that the two screws are pushed forward, thereby injecting the molten material into the closed mold cavity with a lower temperature at a high pressure and a relatively fast speed, maintaining the pressure and cooling it to solidify and form it; Step 4: The upper mold plate moves upward, and the conveyor pulls out the injection-molded zipper product. Simultaneously, the left and right chain belts are continuously conveyed into the mold cavity for the next injection molding process.

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