A bicycle seat injection molding device

Abstract

The present application relates to injection molding machine technical field, specifically is a kind of bicycle cushion injection molding device, the present application includes workbench, workbench is provided with the matched movable die mechanism and static die mechanism, still includes two groups of symmetrical injection mechanism, and the material guiding assembly of connecting injection mechanism and static die mechanism gate.The layered stable component for keeping melt uniform is arranged in injection mechanism, and the material guiding assembly includes the composite injection nozzle connected with the discharge end of two groups of injection mechanism, the coaxial three-layer runner structure is used to composite injection nozzle, different flow form switching can be realized, and the rectifier structure is connected with the front end of runner.The present application can realize bicycle cushion two-component gradient integrated forming under the premise of single fixed gate, fixed nozzle, effectively inhibit fiber sedimentation and fountain effect, solve the problem that existing cushion forming performance cannot be considered, structure is complex, and many forming defects, product performance is stable, and the yield is high.

Description

Technical Field

[0001] This invention relates to the field of injection molding machine technology, specifically to a bicycle seat injection molding device. Background Technology

[0002] With the increasing popularity of cycling, users have placed higher demands on the support, comfort, and lifespan of bicycle saddles. Bicycle saddles need to simultaneously meet the requirements of high rigidity and creep resistance in the ischial tuberosity support area, as well as high flexibility and low-pressure resilience in the nose area. Injection molding of bicycle saddles refers to the process of injecting molten polymer or polymer solution into the cavity of a saddle molding mold using injection molding equipment, followed by pressure holding and curing to obtain a one-piece saddle product. It is currently the mainstream molding method for the industrial mass production of bicycle saddles.

[0003] Existing bicycle saddle injection molding technologies mainly fall into two categories: one is single-material integrated injection molding, which uses the same polymer material to fill the entire cavity, and adjusts the cavity structure to achieve differences in hardness in different areas of the saddle; the other is multi-material split injection molding and bonding, which separately injection molds the rigid support layer and the flexible contact layer of the saddle, and then assembles them into a finished product through bonding, snap-fitting, or other methods. In addition, existing two-component gradient injection molding technologies often employ dual-nozzle, multi-gate switching, or rotating molds to achieve the filling of different component materials.

[0004] The aforementioned existing technologies have the following shortcomings: 1. Single-material injection molding cannot simultaneously meet the rigidity and flexibility requirements of different areas of the seat. The performance adjustment range based solely on structural adjustments is extremely narrow and cannot meet the needs of professional cycling. Separately bonded seat cushions have obvious material interfaces, which can easily lead to stress concentration, cracking, and delamination during use. In addition, the multi-process production process is long and inefficient. Second, conventional two-component gradient injection molding relies on moving nozzles, multiple gates or rotating molds, which are complex in structure and expensive. It is difficult to achieve orderly gradient filling under the premise of a single fixed gate and fixed nozzle. Furthermore, two-component materials are prone to reverse mixing and diffusion, resulting in poor gradient molding accuracy. Third, for carbon fiber reinforced modified materials, existing injection molding equipment cannot effectively suppress fiber sedimentation and phase separation during the injection process, which can easily lead to uneven performance of the product. At the same time, the fountain effect during the filling process can cause a thick solvent-rich layer to form on the surface of the product, resulting in problems such as peeling, poor wear resistance, and insufficient dimensional accuracy. The slender nose area is also prone to molding defects such as material shortage, air entrapment, and warping deformation, so the overall yield needs to be improved. Summary of the Invention

[0005] The purpose of this invention is to provide a bicycle seat injection molding apparatus to solve the problems mentioned in the background art.

[0006] The objective of this invention can be achieved through the following technical solutions: A bicycle seat injection molding apparatus includes a worktable with multiple evenly distributed support legs fixedly mounted on its bottom surface. A control panel is mounted on the worktable. A moving mold mechanism and a stationary mold mechanism cooperating with the moving mold mechanism are located at one end of the top surface of the worktable. A gate is provided on the back of the stationary mold mechanism. The apparatus also includes: The injection molding mechanism consists of two sets, which are symmetrically and fixedly installed on the top surface of the worktable. And a material guiding assembly, which is disposed between the stationary mold mechanism and the two sets of injection molding mechanisms, for guiding the molten material through the gate; The injection molding mechanism is equipped with a layer stabilizing component to maintain uniformity of the melt. The material guiding assembly includes a composite injection nozzle, which is connected to the discharge end of two sets of injection mechanisms. The composite injection nozzle includes a central tube, an intermediate tube surrounding the central tube, and an outer tube surrounding the intermediate tube. The front ends of the central tube, the intermediate tube, and the outer tube are connected to a shrinkage manifold. The other end of the shrinkage manifold is connected to a rectifier structure, and the other end of the rectifier structure is connected to the gate.

[0007] Furthermore, the central tube is a DC channel; The inner wall of the intermediate tube is provided with right-hand spiral guide ribs, and the outer periphery of the intermediate tube is provided with two symmetrically distributed feed ports near the end. The inner wall of the outer tube is provided with a left-handed spiral guide rib, and the outer tube has a feed inlet two near the end.

[0008] Furthermore, the rectifying structure includes an injection-molded pipe, which is connected to the end of the shrinkage manifold via a flange. A rectifying plate is provided in the flange, and the end of the injection-molded pipe away from the shrinkage manifold is connected to the gate.

[0009] Furthermore, the side of the rectifier disk is provided with uniformly distributed honeycomb holes, and multiple heating rods are uniformly embedded in the rectifier disk, wherein the honeycomb holes are multiple regular hexagonal holes.

[0010] Furthermore, the injection molding mechanism includes a cylinder set on the worktable, a support seat is fixedly installed between the outer periphery of the cylinder and the top surface of the worktable near the front end, a plurality of heating coils are arranged in an array along the length of the outer periphery of the cylinder, and an upward-opening feed hopper is fixedly installed through the outer periphery of the cylinder near the end. The front end of the cylinder is fixedly connected to a discharge pipe, and a tee is fixedly installed at the front end of the discharge pipe. The other two ends of one tee are respectively connected to conduit one and conduit two, and the other two ends of the other tee are respectively connected to conduit four and conduit three. The end of conduit three away from the tee is connected to inlet two, the end of conduit four away from the tee is connected to inlet one, conduit one is connected to inlet one, conduit two is connected to the inlet end of the central tube, and solenoid valves are installed in conduit one, conduit two, conduit four and conduit three. The cylinder is equipped with a delivery and injection assembly.

[0011] Furthermore, the guiding and injecting assembly includes a threaded rod slidably installed in the cylinder, a column is fixedly connected to the end of the threaded rod, the column is slidably connected to the inner wall of the cylinder, the end of the column away from the threaded rod extends to the outside of the cylinder, and a pulley is fixedly installed on the outer side of the column at the end located outside the cylinder. The integrated cylindrical structure formed by the column and the threaded rod is a hollow structure. A drive shaft is coaxially arranged on its inner wall. The drive shaft is rotatably connected to the hollow cylindrical structure through a sealed rotary bearing. The front end of the drive shaft is fixedly connected to the layered stabilizing component. The end of the layered stabilizing component away from the drive shaft is detachably fixedly installed with a push head assembly. The end of the drive shaft extends to the outside of the column, and a pulley is fixedly installed at the end of the drive shaft located outside the column. A push-in mechanism is fixedly installed on the periphery of the column near its end between it and the top surface of the workbench. A drive assembly that is connected to pulley one and pulley three is fixedly installed on the push-in mechanism.

[0012] Furthermore, the layered stabilizing component includes a flow stabilizing column fixedly connected to the drive shaft, and the flow stabilizing column is fixedly mounted with a plurality of circumferentially arrayed spiral blades, and there is a gap between the spiral blades and the inner wall of the cylinder. An internal thread groove is provided at the center of the end of the flow stabilizer that is away from the drive shaft.

[0013] Furthermore, the injection head assembly includes a mounting post, at the end of which a threaded post that mates with the internal thread groove is fixedly mounted, a gasket is provided on the periphery of the mounting post near the end, a cone is fixedly mounted on the front end of the mounting post, and a check ring is sleeved on the periphery of the mounting post between the cone and the gasket.

[0014] Furthermore, the injection mechanism includes two fixed blocks fixedly installed on the top surface of the workbench, a lead screw rotatably installed between the two fixed blocks, and two guide rods symmetrically distributed about the lead screw fixedly connected between the two fixed blocks. A slide block is slidably installed through the two guide rods, and the slide block is threadedly connected to the lead screw. The slide block is located directly below the column, and a linkage support block fixedly installed on the top surface of the slide block is fixedly connected through the column. A motor is fixedly mounted on the outer side of one of the fixed blocks. The end of the lead screw near the motor rotates through the fixed block at the corresponding position and is fixedly connected to the output shaft end of the motor.

[0015] Furthermore, the drive assembly includes a boss fixedly connected to the side of the linkage support block, on which motor two and motor three are fixedly mounted; A pulley is fixedly mounted on the output shaft end of the motor 2, and a belt is connected between the pulley 2 and the lead screw. A pulley four is fixedly installed on the output shaft end of the motor three, and a belt two is connected between the pulley four and the pulley three.

[0016] The beneficial effects of this invention are: 1. This invention uses a dual injection molding mechanism to deliver rigid and flexible materials separately, and with the sequential flow channel switching of a three-layer composite injection nozzle, it achieves high rigidity support in the ischial bone area, high flexibility and resilience in the nose area, and continuous and gradual performance changes in the transition area of ​​the seat cushion under the premise of integrated molding. It does not require separate bonding, solves the problem of poor adaptability of single material performance, and avoids the defects of interface cracking and delamination.

[0017] 2. The present invention adopts a rigid structure with fixed gate and fixed nozzle, which eliminates the need to move the nozzle, switch between multiple gates or rotate the mold. The flow mode can be switched by the timing of the solenoid valve of the conduit. At the same time, the two components are instantaneously mixed near the nozzle, and the forward and reverse swirling flow counteracts the flow to achieve micro-scale uniform mixing, effectively avoiding back mixing and diffusion.

[0018] 3. The present invention uses a coaxial differentially rotating layered stabilizing component to form a stable shear vortex in the barrel, which continuously rolls up and disperses the settled carbon fibers, inhibits fiber sedimentation and phase separation, reduces the performance deviation between the upper and lower surfaces of the product, and ensures the uniformity and stability of the product performance.

[0019] 4. This invention, through the differentiated flow pattern design of the three-layer composite injection nozzle, adapts to the filling needs of different areas of the cushion, avoiding material shortage, air trapping, and warping deformation in the nose area; combined with the honeycomb hole rectification and local temperature control of the rectification structure, the swirling flow is transformed into a stable plunger flow, while forming a core-shell flow pattern with low viscosity on the surface and high viscosity in the core, weakening the fountain effect and significantly improving the surface quality, wear resistance and dimensional accuracy of the product. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a three-dimensional schematic diagram of the overall structure of the present invention; Figure 2 yes Figure 1 Enlarged view of section A; Figure 3 This is a schematic diagram of the connection relationship between the injection molding mechanism and the material guiding assembly in this invention; Figure 4 This is a schematic diagram of the internal structure of the composite injection nozzle in this invention; Figure 5 This is a three-dimensional schematic diagram of the rectifier disk in this invention; Figure 6 This is a three-dimensional schematic diagram of the threaded rod in this invention; Figure 7 yes Figure 6 Enlarged view of section B; Figure 8 yes Figure 6 A half-section of the front view; Figure 9 yes Figure 8 Enlarged view of section C; The attached figures are labeled as follows: 1-Workbench, 2-Support leg, 3-Moving mold mechanism, 4-Stationary mold mechanism, 5-Injection mechanism, 6-Guide assembly, 7-Compound injection nozzle, 8-Rectifying structure, 9-Cylinder, 10-Feed hopper, 11-Heating coil, 12-Support base, 13-Outlet pipe, 14-Tee, 15-Conduit pipe one, 16-Conduit pipe two, 17-Conduit pipe three, 18-Conduit pipe four, 19-Center pipe, 20-Intermediate pipe, 21-Inlet port one, 22-Outer pipe, 23-Inlet port two, 24-Contraction manifold, 26-Injection pipe, 27-Gate, 28-Column, 29-Linkage support block, 30-Fixing block, 3 1-Guide rod, 32-Slide block, 33-Motor 1, 34-Screw screw, 35-Pulley 1, 36-Belt 1, 37-Drive shaft, 38-Pulley 3, 39-Belt 2, 40-Pulley 4, 41-Giant seat, 42-Motor 2, 43-Motor 3, 44-Flange, 45-Rectifier plate, 46-Left-hand spiral guide rib, 47-Right-hand spiral guide rib, 48-Threaded rod, 49-Flow stabilizer column, 50-Spiral blade, 51-Washer ring, 52-Check ring, 53-Cone, 54-Mounting column, 55-Threaded column, 56-Internal thread groove, 58-Honeycomb hole, 59-Heating rod, 60-Pulley 2. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: Please see Figures 1-4 In this embodiment of the invention, a bicycle seat injection molding apparatus includes a workbench 1, with multiple evenly distributed support legs 2 fixedly installed on the bottom surface of the workbench 1. A control panel is provided on the workbench 1, and a moving mold mechanism 3 and a stationary mold mechanism 4 cooperating with the moving mold mechanism 3 are provided at one end of the top surface of the workbench 1. A gate 27 is provided on the back of the stationary mold mechanism 4; it also includes: The injection molding mechanism 5 is provided in two sets, which are symmetrically fixedly installed on the top surface of the worktable 1. And the material guiding component 6, which is located between the stationary mold mechanism 4 and the two sets of injection molding mechanisms 5, is used to guide the molten material into 4 through the gate 27; The injection molding mechanism 5 is equipped with a layer stabilizing component to maintain uniform molten material. The material guiding assembly 6 includes a composite injection nozzle 7, which is connected to the discharge end of the two injection mechanisms 5. The composite injection nozzle 7 includes a central tube 19, an intermediate tube 20 is arranged around the central tube 19, and an outer tube 22 is arranged around the intermediate tube 20. The front ends of the central tube 19, the intermediate tube 20, and the outer tube 22 are connected to a shrinkage manifold 24. The other end of the shrinkage manifold 24 is connected to a rectifier structure 8, and the other end of the rectifier structure 8 is connected to the gate 27.

[0023] Central tube 19 is a DC channel; The inner wall of the intermediate tube 20 is provided with right-hand spiral guide ribs 47, and the outer periphery of the intermediate tube 20 is provided with two symmetrically distributed feed inlets 21 near the end. The inner wall of the outer tube 22 is provided with a left-handed spiral guide rib 46, and the outer tube 22 is provided with a feed inlet 23 near the end.

[0024] During operation, the two sets of injection molding mechanisms 5 respectively deliver high-modulus rigid material A and high-elasticity flexible material B. Material A can be passed into the central tube 19 to form a straight high-speed jet, or it can be passed into the intermediate tube 20, where it forms a clockwise swirling flow through the forced guidance of the right-hand spiral guide rib 47. Material B can be passed into the intermediate tube 20 to mix with material A, or it can be passed into the outer tube 22, where it forms a counterclockwise reverse swirling flow through the forced guidance of the left-hand spiral guide rib 46.

[0025] This structure, through its three-layer independent flow channel design, allows for sequential switching of various flow patterns, such as jetting, swirling, and counter-current mixed flow, within the same nozzle, without the need to move the nozzle or change the gate. This solves the problems of complex structure and high cost of existing two-component gradient injection molding equipment. At the same time, the coaxial three-layer flow channel can realize a wrapping material flow structure of rigid core, gradient transition layer, and flexible outer layer, which is suitable for the performance gradient requirements from the ischium area to the nose area of ​​a bicycle saddle. It eliminates the need for separate bonding, avoids the problem of interface cracking and delamination, and improves the service life of the product.

[0026] Example 2: Please see Figures 3-5 Based on embodiment 1, the rectifier structure 8 includes an injection tube 26, which is connected to the end of the shrinkage manifold 24 through a flange 44. A rectifier plate 45 is provided in the flange 44, and the end of the injection tube 26 away from the shrinkage manifold 24 is connected to the gate 27.

[0027] The rectifier disk 45 has uniformly distributed honeycomb holes 58 on its side, and multiple heating rods 59 are uniformly embedded in the rectifier disk 45. The honeycomb holes 58 are multiple regular hexagonal holes.

[0028] During operation, the swirling and jetting composite material flow ejected from the converging section 24 of the composite injection nozzle 7 first enters the honeycomb holes 58 of the rectifier plate 45. The regular hexagonal honeycomb holes forcibly cut the rotating and turbulent material flow into multiple uniform fine streams, eliminating residual turbulence and swirling kinetic energy in the material flow, and converting it into a stable plunger flow for forward transport. At the same time, the heating rod 59 in the rectifier plate 45 can perform localized and precise temperature control on the material flow, raising the surface temperature of the material flow and reducing the surface viscosity, forming a flow pattern with low surface viscosity and high core viscosity.

[0029] This structure, through honeycomb pore rectification, solves the problems of flow deviation and cross-flow that occur after the swirling material enters the cavity, ensuring the stability of the filling sequence and avoiding material shortage and air trapping in the nose area. At the same time, the core and shell flow pattern formed by local temperature control weakens the fountain effect during injection molding, preventing the migration of solvents and low molecular weight substances in the melt to the surface of the product, thus solving the problems of peeling and poor wear resistance of existing products.

[0030] Example 3: Please see Figures 1-4 Based on embodiment 1, the injection molding mechanism 5 includes a cylinder 9 set on the worktable 1. A support base 12 is fixedly installed between the outer periphery of the cylinder 9 and the top surface of the worktable 1 near the front end. Multiple heating coils 11 are arranged in an array along the length direction of the outer periphery of the cylinder 9. An upward-opening feed hopper 10 is fixedly installed through the outer periphery of the cylinder 9 near the end. A discharge pipe 13 is fixedly connected to the front end of the cylinder 9. A tee 14 is fixedly installed at the front end of the discharge pipe 13. The other two ends of one tee 14 are respectively connected to conduit 15 and conduit 2 16. The other two ends of the other tee 14 are respectively connected to conduit 4 18 and conduit 3 17. The end of conduit 3 17 away from the tee 14 is connected to inlet 2 23. The end of conduit 4 18 away from the tee 14 is connected to inlet 1 21. Conduit 15 is connected to inlet 1 21. Conduit 2 16 is connected to the inlet end of the central pipe 19. Solenoid valves are installed in conduit 15, conduit 2 16, conduit 4 18 and conduit 3 17. The cylinder 9 is equipped with a delivery and injection assembly.

[0031] During operation, material A flows out from the outlet pipe 13 of the right injection molding mechanism 5, and is divided into two paths via the tee 14, entering conduit 15 and conduit 2 16 respectively. By controlling the opening and closing of the corresponding solenoid valve, material A can be controlled to enter the central pipe 19 or the intermediate pipe 20. Material B flows out from the outlet pipe 13 of the left injection molding mechanism 5, and is divided into two paths via the tee 14, entering conduit 3 17 and conduit 4 18 respectively. By controlling the opening and closing of the corresponding solenoid valve, material B can be controlled to enter the intermediate pipe 20 or the outer pipe 22. This structure, through the tee flow diversion and the timing control of the solenoid valve, can achieve rapid switching of the flow channel mode simply by opening and closing the valve, without the need for a complex mechanical reversing structure. It can achieve linear and precise adjustment of the flow rates of materials A and B, forming a continuous gradient ratio in the intermediate pipe 20, solving the problems of poor gradient accuracy and back-mixing diffusion of two components in existing technologies. By controlling the timing of the solenoid valve, the filling sequence of the ischial tuberosity area, transition area, and nose area of ​​the cushion can be matched, so that different components injected at different times can accurately correspond to different functional areas of the cushion.

[0032] Example 4:

[0033] Please see Figure 2 and 6 ~ Figure 9 Based on embodiment 3, the delivery and injection assembly includes a threaded rod 48 slidably installed in the cylinder 9, a column 28 fixedly connected to the end of the threaded rod 48, a slidably connected column 28 to the inner wall of the cylinder 9, one end of the column 28 away from the threaded rod 48 extending to the outside of the cylinder 9, and a pulley 35 fixedly installed on the periphery of the column 28 at one end outside the cylinder 9. The integrated cylindrical structure formed by the column 28 and the threaded rod 48 is a hollow structure. A drive shaft 37 is coaxially arranged on its inner wall. The drive shaft 37 is rotatably connected to the hollow cylindrical structure through a sealed rotary bearing. A layered stabilizing component is fixedly connected to the front end of the drive shaft 37. A push head assembly is detachably fixedly installed at the end of the layered stabilizing component away from the drive shaft 37. The end of the drive shaft 37 extends to the outside of the column 28, and a pulley 38 is fixedly installed at the end of the drive shaft 37 located outside the column 28. A dispensing mechanism is fixedly installed on the periphery of the column 28 near its end between it and the top surface of the workbench 1. A drive assembly that is connected to pulley 35 and pulley 38 is fixedly installed on the dispensing mechanism.

[0034] During operation, the drive assembly can drive the threaded rod 48 and the column 28 to rotate as a whole through pulley 35, thereby realizing the axial conveying of the molten material; at the same time, it can drive the transmission shaft 37 to rotate independently through pulley 38, and the rotation direction and speed of the transmission shaft 37 can be adjusted completely independently from the threaded rod 48, thereby driving the front-end layer stabilizing assembly to achieve differential reverse rotation with the feeding screw.

[0035] The structure adopts a coaxial nested hollow design, realizing independent driving of feeding and flow stabilization within the same shaft, solving the problems of mutual interference and layout difficulties between the feeding and flow stabilization structures; the independent drive design can flexibly adjust the speed difference between the screw and the layered stabilization component according to the characteristics of different materials, adapting to modified materials with different viscosities and fiber contents, thus improving the material adaptability and versatility of the device.

[0036] Example 5: Please see Figures 6-9 Based on embodiment 4, the layered stabilizing component includes a flow stabilizing column 49 fixedly connected to the drive shaft 37. The flow stabilizing column 49 is fixedly mounted with a plurality of circumferentially arrayed spiral blades 50, and there is a gap between the spiral blades 50 and the inner wall of the cylinder 9. An internal threaded groove 56 is provided at the center of the end of the flow stabilizer column 49 away from the drive shaft 37.

[0037] The injection head assembly includes a mounting post 54, a threaded post 55 that mates with an internal threaded groove 56 is fixedly mounted at the end of the mounting post 54, a gasket 51 is provided on the periphery of the mounting post 54 near the end, a cone 53 is fixedly mounted at the front end of the mounting post 54, and a check ring 52 located between the cone 53 and the gasket 51 is sleeved on the periphery of the mounting post 54.

[0038] During operation, the drive shaft 37 drives the flow stabilizer column 49 and the threaded rod 48 to rotate in opposite directions at a differential speed. The spiral blades 50 on the surface of the flow stabilizer column 49 form a continuous shear vortex inside the cylinder 9, which circumferentially disturbs the molten material. This continuously rolls up the carbon fibers that have settled at the bottom of the cylinder 9 under gravity and evenly disperses them in the melt, suppressing fiber sedimentation and phase separation. At the same time, the cone head 53 of the injection head assembly can smoothly guide the molten material, and the check ring 52 can effectively prevent the molten material from flowing back during the pressure holding stage, ensuring the stable transmission of injection pressure. This structure, through the counter-rotating spiral blades 50, solves the problems of fiber sedimentation and phase separation that easily occur in carbon fiber reinforced molten material during injection, ensuring the uniformity and stability of the mechanical properties of the product. The injection head assembly uses a threaded detachable connection, and the appropriate cone head 53 and check ring 52 can be quickly replaced according to different material properties, making maintenance convenient and highly adaptable.

[0039] Example 6:

[0040] Please see Figure 2 Based on embodiment 5, the injection mechanism includes two fixed blocks 30 fixedly installed on the top surface of the workbench 1. A lead screw 34 is rotatably installed between the two fixed blocks 30, and two guide rods 31 symmetrically distributed about the lead screw 34 are fixedly connected between the two fixed blocks 30. A slide block 32 is slidably installed through the two guide rods 31, and the slide block 32 is threadedly connected to the lead screw 34. The slide block 32 is located directly below the column 28, and a linkage support block 29 is fixedly installed on the top surface of the slide block 32 and is fixedly connected through the column 28. A motor 33 is fixedly mounted on the outer side of a fixed block 30. The end of the lead screw 34 near the motor 33 rotates through the fixed block 30 at the corresponding position and is fixedly connected to the output shaft end of the motor 33.

[0041] The drive assembly includes a boss 41 fixedly connected to the side of the linkage support block 29, and motor 2 42 and motor 3 43 are fixedly mounted on the boss 41. A pulley 2 60 is fixedly installed on the output shaft end of motor 2 42, and a belt 1 36 is connected between pulley 2 60 and lead screw 34; The output shaft of motor 3 43 is fixedly mounted with pulley 40, and belt 2 39 is connected between pulley 40 and pulley 3 38.

[0042] During operation, motor 1 (33) drives screw 34 to rotate, which in turn drives slide 32 to reciprocate axially along guide rod 31. This, in turn, drives the entire conveying and injection assembly to move axially via linkage support block 29, achieving high-pressure injection of the molten material. Motor 2 (42) drives threaded rod 48 to rotate via belt drive, achieving molten material conveying and plasticizing. Motor 3 (43) drives transmission shaft 37 to rotate independently via belt drive, achieving differential stirring of the stratified stabilizing assembly. This structure uses three independent motors to drive axial injection, screw feeding, and steady-flow stirring respectively. The parameters of the three actions can be adjusted completely independently without interference. The injection pressure, feeding speed, and stirring speed can be flexibly adjusted according to the needs of different molding stages to adapt to the filling process requirements of different areas of the cushion.

[0043] Example 7: Based on Example 1, the moving mold mechanism 3 and the stationary mold mechanism 4 are conventional mold-closing mechanisms in the injection molding field and belong to the prior art. The moving mold mechanism 3 includes a moving platen, multiple guide pillars, and a mold-closing drive cylinder. A seat core insert is fixedly installed on the moving platen. The stationary mold mechanism 4 includes a stationary platen with a cavity groove adapted to the core insert. A cavity insert is fixedly installed within the cavity groove. After the cavity insert and the core insert are closed, a closed molding cavity matching the shape of a bicycle seat is formed. The gate 27 is located on the stationary platen and is connected to the seat support area of ​​the molding cavity. The mold-closing drive cylinder drives the moving platen to reciprocate along the guide pillars, realizing the opening and closing actions of the moving mold mechanism 3 and the stationary mold mechanism 4.

[0044] Example 8: The control panel on workbench 1 is a conventional automated control device in the injection molding field and belongs to existing technology. The control panel includes a PLC controller, a touch screen display, a multi-channel signal acquisition module, and a drive control module. The signal acquisition module is electrically connected to the heating coil 11, the heating rod 59 in the rectifier plate 45, and the thermocouple, respectively, for acquiring real-time temperature signals. The drive control module is electrically connected to the solenoid valves in motor 1 33, motor 2 42, motor 3 43, and conduit 15, conduit 2 16, conduit 3 17, and conduit 4 18, respectively, for controlling the start / stop, speed, and direction of each motor, as well as the on / off sequence of each solenoid valve.

[0045] The touch screen allows users to preset process parameters such as injection temperature, injection pressure, feeding sequence, runner switching logic, and stirring speed. The PLC controller, based on the preset parameters and real-time signals, uses existing conventional injection molding machine PLC control programs to automate the entire process of mold closing, feeding, injection, runner switching, pressure holding, and mold opening.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A bicycle seat injection molding apparatus, comprising a workbench (1), wherein a plurality of evenly distributed support legs (2) are fixedly installed on the bottom surface of the workbench (1), a control panel is provided on the workbench (1), a moving mold mechanism (3) and a stationary mold mechanism (4) cooperating with the moving mold mechanism (3) are provided at one end of the top surface of the workbench (1), and a gate (27) is provided on the back side of the stationary mold mechanism (4); characterized in that, Also includes: The injection molding mechanism (5) is provided in two sets, which are symmetrically fixedly installed on the top surface of the workbench (1); And a material guiding assembly (6), which is disposed between the stationary mold mechanism (4) and the two sets of injection molding mechanisms (5), for guiding the molten material into 4 through the gate (27); The injection molding mechanism (5) is equipped with a layer stabilizing component to maintain uniformity of the melt; The material guiding assembly (6) includes a composite injection nozzle (7), which is connected to the discharge end of two sets of injection mechanisms (5). The composite injection nozzle (7) includes a central tube (19), with an intermediate tube (20) arranged around the central tube (19) and an outer tube (22) arranged around the intermediate tube (20). The front ends of the central tube (19), the intermediate tube (20) and the outer tube (22) are connected to a shrinkage confluence section (24). The other end of the shrinkage confluence section (24) is connected to a rectifier structure (8), and the other end of the rectifier structure (8) is connected to the gate (27).

2. The bicycle seat injection molding apparatus according to claim 1, characterized in that, The central tube (19) is a DC channel; The inner wall of the intermediate tube (20) is provided with right-hand spiral guide ribs (47), and the outer periphery of the intermediate tube (20) is provided with two symmetrically distributed feed inlets (21) near the end. The inner wall of the outer tube (22) is provided with a left-handed spiral guide rib (46), and the outer tube (22) is provided with a feed inlet (23) near the end.

3. The bicycle seat injection molding apparatus according to claim 1, characterized in that, The rectifying structure (8) includes an injection tube (26), which is connected to the end of the shrinkage manifold (24) through a flange (44). A rectifying plate (45) is provided in the flange (44), and the end of the injection tube (26) away from the shrinkage manifold (24) is connected to the gate (27).

4. The bicycle seat injection molding apparatus according to claim 3, characterized in that, The side of the rectifier disk (45) is provided with uniformly distributed honeycomb holes (58), and multiple heating rods (59) are uniformly embedded in the rectifier disk (45). The honeycomb holes (58) are multiple regular hexagonal holes.

5. The bicycle seat injection molding apparatus according to claim 2, characterized in that, The injection molding mechanism (5) includes a cylinder (9) set on the workbench (1). A support base (12) is fixedly installed between the outer periphery of the cylinder (9) and the top surface of the workbench (1) near the front end. Multiple heating coils (11) are arranged in an array along the length direction of the outer periphery of the cylinder (9). An upward-opening feed hopper (10) is fixedly installed through the outer periphery of the cylinder (9) near the end. The front end of the cylinder (9) is fixedly connected to the discharge pipe (13), and the front end of the discharge pipe (13) is fixedly installed with a tee (14). The other two ends of one tee (14) are respectively connected to the first conduit (15) and the second conduit (16). The other two ends of the other tee (14) are respectively connected to the fourth conduit (18) and the third conduit (17). The end of the third conduit (17) away from the tee (14) is connected to the second inlet (23). The end of the fourth conduit (18) away from the tee (14) is connected to the first inlet (21). The first conduit (15) is connected to the other inlet (21). The second conduit (16) is connected to the inlet end of the central pipe (19). Solenoid valves are provided in the first conduit (15), the second conduit (16), the fourth conduit (18) and the third conduit (17). The cylinder (9) is equipped with a delivery and injection assembly.

6. The bicycle seat injection molding apparatus according to claim 5, characterized in that, The delivery and injection assembly includes a threaded rod (48) slidably installed in the cylinder (9), with a column (28) fixedly connected to the end of the threaded rod (48), the column (28) being slidably connected to the inner wall of the cylinder (9), the end of the column (28) away from the threaded rod (48) extending to the outside of the cylinder (9), and a pulley (35) fixedly installed on the periphery of the column (28) at the position located at the outside end of the cylinder (9). The integrated cylindrical structure formed by the column (28) and the threaded rod (48) is a hollow structure. A drive shaft (37) is coaxially arranged on its inner wall. The drive shaft (37) is rotatably connected to the hollow cylindrical structure through a sealed rotating bearing. The front end of the drive shaft (37) is fixedly connected to the layered stabilizing component. The end of the layered stabilizing component away from the drive shaft (37) is detachably fixedly installed with a push head assembly. The end of the drive shaft (37) extends to the outside of the column (28), and a pulley (38) is fixedly installed at the end of the drive shaft (37) located outside the column (28). A push-in mechanism is fixedly installed on the periphery of the column (28) near the end and between it and the top surface of the workbench (1). A drive assembly that is connected to the pulley one (35) and the pulley three (38) is fixedly installed on the push-in mechanism.

7. The bicycle seat injection molding apparatus according to claim 6, characterized in that, The layered stabilizing component includes a flow stabilizing column (49) fixedly connected to the drive shaft (37), and the flow stabilizing column (49) is fixedly mounted with a plurality of circumferentially arrayed spiral blades (50), and there is a gap between the spiral blades (50) and the inner wall of the cylinder (9). The flow stabilizer (49) has an internal thread groove (56) at the center of the end away from the drive shaft (37).

8. The bicycle seat injection molding apparatus according to claim 7, characterized in that, The injection head assembly includes a mounting post (54), at the end of which a threaded post (55) is fixedly mounted to cooperate with the internal thread groove (56). A gasket (51) is provided on the periphery of the mounting post (54) near the end. A cone (53) is fixedly mounted on the front end of the mounting post (54). A check ring (52) is sleeved on the periphery of the mounting post (54) between the cone (53) and the gasket (51).

9. A bicycle seat injection molding apparatus according to claim 6, characterized in that, The injection mechanism includes two fixed blocks (30) fixedly installed on the top surface of the workbench (1). A lead screw (34) is rotatably installed between the two fixed blocks (30). Two guide rods (31) symmetrically distributed about the lead screw (34) are fixedly connected between the two fixed blocks (30). A slide block (32) is slidably installed through the two guide rods (31). The slide block (32) is threadedly connected to the lead screw (34). The slide block (32) is located directly below the column (28). A linkage support block (29) is fixedly installed on the top surface of the slide block (32) and is fixedly connected through the column (28). A motor (33) is fixedly installed on the outer side of a fixed block (30). The end of the lead screw (34) near the motor (33) rotates through the fixed block (30) at the corresponding position and is fixedly connected to the output shaft end of the motor (33).

10. A bicycle seat injection molding apparatus according to claim 9, characterized in that, The drive assembly includes a boss (41) fixedly connected to the side of the linkage support block (29), and motor two (42) and motor three (43) are fixedly mounted on the boss (41). The output shaft of the second motor (42) is fixedly mounted with a pulley (60), and a belt (36) is connected between the pulley (60) and the lead screw (34). The output shaft of the motor three (43) is fixedly mounted with pulley four (40), and belt two (39) is connected between pulley four (40) and pulley three (38).

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