Plasticizing driving mechanism of PVC injection molding machine and working method

Abstract

The invention discloses a PVC injection molding machine plasticizing driving mechanism and a working method, the PVC injection molding machine plasticizing driving mechanism comprises a whole moving type thrust seat device, a transmission system used for being connected with a screw charging barrel assembly is integrated in the thrust seat device, and the transmission system is driven by a driving system to rotate; the driving system comprises an independent hydraulic oil motor and a speed reducer connected with the hydraulic oil motor to realize combined driving, and the transmission system comprises a top shaft connected with the speed reducer. According to the plasticizing driving mechanism of the PVC injection molding machine, the single oil motor with the large specification and the speed reducer are jointly driven, larger driving force is obtained or specific motion control is achieved, the system is simple, transmission efficiency can be improved, energy loss can be reduced, the adaptation range of the plasticizing driving mechanism is widened, and the plasticizing driving mechanism is very excellent in the aspect of cost control. And the structure is reasonable, the assembly is convenient, and the cost-reducing and efficiency-increasing functions are realized.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding machines, and in particular to a plasticizing drive mechanism and a working method of a PVC injection molding machine. Background Art

[0002] PVC injection molding machine, as the name implies, is an injection molding machine designed specifically for processing PVC (polyvinyl chloride) materials. Compared with general injection molding machines, PVC injection molding machines are optimized for the characteristics of PVC materials, especially in the heating system, injection system and mold clamping system, etc. Special improvements have been made to better meet the injection molding needs of PVC materials.

[0003] Since PVC materials need to overcome high melt viscosity during the plasticization process to achieve good melting effect and uniform plasticization quality, the plasticization torque requirements for PVC injection molding machines, especially large injection molding machines, are particularly significant. As the core power component of the injection molding machine, the drive system is responsible for providing the necessary mechanical power. Common PVC injection molding machine drive design solutions include: dual oil motor solution, reducer with servo motor solution.

[0004] The dual oil motor solution uses two hydraulic motors for joint drive in series or parallel, which can obtain greater driving force or achieve specific motion control. However, this solution will reduce the output speed and overall system efficiency, increase energy consumption and cost. The parallel motors also require a separate hydraulic system, which causes uneven load distribution and reduces system reliability.

[0005] The servo motor with the reducer solution can accurately control the output and torque amplification, provide stable and reliable strong load-bearing capacity, and can flexibly respond to different production needs by adjusting parameters. For example, the Chinese patent document CN219820446U discloses a servo planetary reducer motor integrated machine for electric melt adhesive for injection molding machine, which involves the technical field of electric melt adhesive for injection molding machine, including planetary reducer and servo motor. However, there are also problems such as high price of large-scale servo motor and reducer, complex system, reduced efficiency and high technical threshold.

[0006] In the above drive design scheme, in order to meet specific power requirements, the performance is usually improved by increasing the displacement of the oil motor or increasing the electric pre-plasticization power. However, large-sized oil motors are not only difficult to obtain, but also extremely expensive; the use of higher-power motors will lead to a significant increase in costs, which undoubtedly increases the budget pressure for equipment procurement. Especially for PVC injection molding machines, the plasticizing speed is relatively low, generally maintained at around 20rpm. Summary of the invention

[0007] The purpose of the present invention is to solve the problems of insufficient displacement, complex system, and high cost in the existing PVC injection molding machine drive system, and to provide a PVC injection molding machine plasticizing drive mechanism and working method. The drive mechanism adopts a drive system design scheme combining an oil motor and a reducer, which not only solves the above-mentioned problems of insufficient displacement and high cost, but also achieves a significant increase in output torque, even reaching an exponential increase. While optimizing performance, it also greatly reduces the overall cost investment, making the entire system more cost-effective.

[0008] The technical solution adopted by the present invention to achieve the first invention purpose is: a plasticizing drive mechanism of a PVC injection molding machine, comprising a fully movable thrust seat device, a transmission system for connecting with a screw barrel assembly is integrated inside the thrust seat device, and the transmission system is driven to rotate by a driving system; the driving system comprises an independent hydraulic oil motor and a reducer connected to the hydraulic oil motor to realize joint drive, and the transmission system comprises a top shaft connected to the reducer. The plasticizing drive mechanism of the PVC injection molding machine is newly designed to solve the problems existing in existing drive mechanisms such as dual oil motors, servo motors and reducers. A thrust seat device that can realize overall movement is set, and a transmission system is integrated inside the thrust seat device. The transmission system uses a single independent large hydraulic oil motor as a driving force, and the hydraulic oil motor drives the reducer to jointly drive, so as to realize the conversion and transmission of power, and the installed power is directly transmitted to a top shaft through the reducer, and the rotation of the top shaft drives the screw barrel assembly to store materials, and the top shaft drives the screw barrel assembly to move forward through the overall movement of the fully movable thrust seat device, thereby realizing the injection operation. The plasticizing drive mechanism of the PVC injection molding machine drives a single larger oil motor and a reducer together to obtain greater driving force or achieve specific motion control. The system is simple, which helps to improve transmission efficiency, reduce energy consumption, and broaden its adaptability range. It also performs very well in cost control.

[0009] Preferably, the hydraulic oil motor is integrated at the input end of the reducer and is in transmission connection with the reducer, so as to realize the conversion and transmission of the hydraulic energy at the input end of the hydraulic oil motor to the mechanical energy at the output end of the reducer. The hydraulic oil motor is integrated at the input end of the reducer, so that the entire drive mechanism has a compact structure and a better force transmission effect, and can effectively realize the conversion and transmission of the hydraulic energy at the input end of the hydraulic oil motor to the mechanical energy at the output end of the reducer. It will not reduce the output speed and the overall efficiency of the system, and has a simple structure and low cost.

[0010] Preferably, the reduction shaft of the reducer includes an input end and an output end, the top shaft is separately arranged from the reducer, and the output end of the reduction shaft is connected to the top shaft. The input end of the reduction shaft of the reducer is used to connect to the hydraulic oil motor, and the output end is used to connect to the top shaft, thereby realizing the conversion and transmission of hydraulic energy into mechanical energy.

[0011] Preferably, the top shaft comprises a drive system connection end and a screw barrel connection end, a reduction shaft connection cavity is arranged inside the drive system connection end, and a screw barrel connection cavity is arranged inside the screw barrel connection end. The above structure of the top shaft is to facilitate the connection with the reduction shaft and the screw barrel assembly.

[0012] Preferably, the reduction shaft of the reducer includes an input end and an output end, and the top shaft is integrally arranged with the output end of the reduction shaft. As another preferred solution, the top shaft and the output end of the reduction shaft can also be arranged as an integrated structure, which reduces assembly errors, improves transmission efficiency, and can be used in high-precision driving scenarios.

[0013] Preferably, the top shaft is rotatably connected to the thrust seat device through a group of bearing groups, and the bearing group realizes the support and positioning of the top shaft. As a transmission component, the top shaft is used to connect the reducer at one end, and the other end is connected to the rear end of the screw barrel assembly through the Harv. The reducer transmits the rotational power to the screw barrel through the top shaft during operation, thereby driving the screw barrel to work. Therefore, in order to realize the effective transmission of the top shaft, the support and positioning of the top shaft are realized through a group of bearing groups. The bearing group mainly plays the role of supporting and positioning the top shaft in the injection molding machine, which can not only ensure the stable rotation of the top shaft and avoid radial or axial displacement, but also withstand the load and vibration during the operation of the injection molding machine to ensure the stability of the transmission system.

[0014] Preferably, the bearing group includes a tapered roller bearing, a thrust spherical roller bearing and a cylindrical roller bearing; the cylindrical roller bearing is located at one end of the top shaft close to the screw barrel assembly; the thrust spherical roller bearing is located in the middle of the bearing group; the tapered roller bearing is located at one end of the top shaft close to the reducer and is fixedly connected to the thrust seat device. The inner and outer rings and rollers of the tapered roller bearing form a certain cone angle, which is particularly suitable for bearing a combined load dominated by radial loads; the raceway surface of the seat ring of the thrust spherical roller bearing is a spherical surface centered on a point consistent with the central axis of the bearing, and the roller is spherical, so it has an automatic self-aligning function and is good at bearing axial loads; the rollers of the cylindrical roller bearing are arranged in parallel, which are used to bear radial loads and a certain degree of axial loads. All three bearings have good operating accuracy and stability, and are highly adaptable to the working environment. This combination can well cope with the complex and changeable load conditions of the injection molding machine.

[0015] Preferably, the thrust seat device comprises a thrust seat end cover and a thrust seat, a sealing assembly is provided between the thrust seat end cover and the top shaft, and a full-shift slide groove is provided at the bottom of the thrust seat. The thrust seat is used to support and transmit the axial thrust transmitted by the top shaft and the bearing group, and the sealing assembly prevents the leakage of lubricating oil or hydraulic oil, and keeps the inside of the thrust seat device clean and lubricated. The setting of the full-shift slide groove facilitates the overall movement of the driving mechanism, thereby driving the screw barrel assembly to realize the injection function.

[0016] Preferably, the reducer is supported by a reducer bracket and is integrally connected to the thrust seat device.

[0017] The technical solution adopted by the present invention to achieve its second invention purpose is: a working method of a plasticizing drive mechanism of a PVC injection molding machine: including the following steps: starting the hydraulic oil motor, the pressurized oil enters the hydraulic oil motor, and the hydraulic energy is converted into mechanical energy through the rotation of the rotor of the hydraulic oil motor, and the reducer performs a deceleration and torque-increasing process on the output speed of the hydraulic oil motor; the reducer drives the top shaft to rotate, and drives the screw to rotate. When the storage space at the head of the screw is filled with molten material, the top shaft and the thrust seat device move together to push the screw forward to achieve the injection action. This working method can effectively realize the conversion and transmission of hydraulic energy to mechanical energy, with high transmission efficiency, low energy consumption, and high working efficiency.

[0018] The beneficial effects of the present invention are as follows: the plasticizing drive mechanism of the PVC injection molding machine drives a single large-sized oil motor and a reducer together to obtain a greater driving force or realize a specific motion control. The system is simple, which helps to improve the transmission efficiency, reduce energy consumption, and broaden its adaptability. It also performs very well in terms of cost control. Moreover, it has a reasonable structure, is easy to assemble, and has the function of reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the plasticizing drive mechanism of the PVC injection molding machine of the present invention; Figure 2 It is a top view of the plasticizing drive mechanism of the PVC injection molding machine of the present invention; Figure 3 It is a left view of the plasticizing drive mechanism of the PVC injection molding machine of the present invention; Figure 4 yes Figure 3 Middle AA section view; Figure 5 This is an application perspective view of the plasticizing drive mechanism of the PVC injection molding machine of the present invention; Figure 6 This is a structural schematic diagram of a plasticizing drive mechanism of a PVC injection molding machine in Embodiment 2 of the present invention; In the figure: 1. drive system; 11. oil motor; 12, reducer; 121, input end; 122, output end; 2. Transmission system; 21. Tapered roller bearing; 22. Thrust spherical roller bearing; 23. Cylindrical roller bearing; 24, top shaft; 241, drive system connection end; 242, screw barrel connection end; 243, reduction shaft connection cavity; 244, screw barrel connection cavity; 25. Harvest; 31. Sealing assembly; 311. Frameless oil seal; 312. Oil seal pressure plate; 313. O-ring; 411a, 411b, 411c, 411d, 411e, hexagon socket head screws; 412a, 412b, 412c, 412d, 412e, spring washers; 421, stud bolts; 422, stud bolt nuts; 431, full-thread hexagonal bolts; 432, hexagonal nuts; 441, locking nuts; 5. Thrust seat device; 51. Thrust seat end cover; 52. Thrust seat; 53. Reducer bracket; 54. Full-shift slideway; 6. Screw barrel assembly. DETAILED DESCRIPTION

[0020] The various aspects of the present invention are described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0021] Embodiment 1: In Figure 1, Figure 2 , Figure 3 , Figure 4 In the embodiment shown, a plasticizing drive mechanism of a PVC injection molding machine mainly comprises: an integrally movable thrust seat device 5, a transmission system 2 for connecting to a screw barrel assembly is integrated inside the thrust seat device 5, and the transmission system 2 is driven to rotate by a drive system 1 jointly driven by a hydraulic oil motor and a reducer.

[0022] The driving system 1 includes an independent hydraulic oil motor 11 and a reducer 12 connected to the output end of the hydraulic oil motor. The reduction shaft of the reducer 12 includes an input end 121 and an output end 122.

[0023] The driving system 1 uses a single hydraulic oil motor 11 as a driving component, which is connected to the reducer 12 through an internal bearing to achieve the conversion and transmission of hydraulic energy at the input end of the hydraulic oil motor to mechanical energy at the output end of the reducer.

[0024] The transmission system 2 includes a top shaft 24 and a group of bearing groups. The top shaft 24 includes a drive system connecting end 241 and a screw barrel connecting end 242. A reduction shaft connecting cavity 243 is arranged inside the drive system connecting end 241, and a screw barrel connecting cavity 244 is arranged inside the screw barrel connecting end 242.

[0025] One end of the top shaft 24 is connected to the output end of the speed reducer, and the other end of the top shaft is used to connect with the screw barrel assembly and drive the screw barrel assembly to rotate for material storage and feeding. The top shaft 24 is a transmission component, one end of which is connected to the speed reducer, and the other end is assembled and connected to the tail end of the screw barrel through the Harv 25. The speed reducer 12 transmits the rotational power to the screw barrel through the top shaft 24, thereby driving the screw barrel to work. The Harv 25 is a fastener and connector, which is used to fix the tail of the screw barrel and one end of the top shaft 24. The driving system outputs a driving force to rotate the top shaft, which then drives the screw connected to the Harv to rotate.

[0026] The thrust seat device 5 comprises a thrust seat end cover 51 and a thrust seat 52. A top shaft installation cavity is provided inside the thrust seat 52. The thrust seat device 5 is used to support and transmit the axial thrust transmitted by the top shaft 24 and the bearing group.

[0027] The thrust seat 52 is used to support and transmit the axial thrust transmitted by the top shaft 24 and the bearing group. The reducer 12 is connected and fixed to the upper part of the thrust seat 52 by connecting fasteners, and the bottom of the thrust seat 52 is connected and fixed to the reducer bracket 53 by connecting fasteners. The reducer and the reducer bracket are fixedly connected using full-thread hexagonal bolts with hexagonal nuts, and the pre-tightening force is applied by tightening the nuts to enhance the reliability and durability of the connection.

[0028] Specifically, the reducer 12 is fixedly connected to the upper part of the thrust seat 52 by the hexagon socket head screw 411b and the spring washer 412b to prevent loosening, the bottom of the thrust seat 51 is fixedly connected to the reducer bracket 53 by the stud bolt 421 and the nut 422, and the pre-tightening force is applied by tightening the nut 422. The reducer 12 and the reducer bracket 53 are fixedly connected by using the full-thread hexagon head bolt 431 in conjunction with the hexagon nut 432, and the pre-tightening force is applied by tightening the nut 432 to enhance the reliability and durability of the connection.

[0029] The reducer 12 is supported by a reducer bracket 53, and the reducer bracket 53 is used to install and fix the reducer to ensure that the reducer can run stably. The full-thread hexagonal head bolt in the connecting fastener is a connecting piece with a full-thread design.

[0030] Specifically, the reducer is supported on the reducer bracket 53 by a full-thread hexagonal bolt 431, and is fixedly connected to the thrust seat and is connected to the top shaft transmission. At the same time, the reducer bracket 53 is horizontally connected to the thrust seat through a stud nut. The reducer bracket 53 is used to install and fix the reducer 12, ensuring that the reducer 12 can operate stably and facilitating the maintenance and replacement of the reducer 12. The full-threaded hexagonal bolt 432 in the connecting element is a connector with a full-thread design, which can provide stronger connection force and stability. The bottom of the thrust seat 52 and the reducer bracket 53 is provided with a full-shift slide groove 54 .

[0031] The thrust seat end cover 51 is installed at one end of the thrust seat 52, and is used to seal and protect the parts inside the thrust seat, and bear the axial thrust. The thrust seat end cover is connected and fixed to the thrust seat by connecting fasteners, and the oil seal pressure plate is connected and fixed to the thrust seat end cover by connecting fasteners.

[0032] Specifically, the thrust seat end cover 51 sealing cover is arranged at one end of the thrust seat facing the screw barrel. A sealing assembly is arranged between the thrust seat end cover and the top shaft 24. The thrust seat end cover 51 is installed at one end of the thrust seat 52, and is used to seal and protect the parts inside the thrust seat 52, while bearing the axial thrust. The thrust seat end cover 51 and the thrust seat 52 are fixedly connected and prevented from loosening by the hexagon socket head screw 411d and the spring washer 412d, and the oil seal pressure plate 312 and the thrust seat end cover 51 are fixedly connected and prevented from loosening by the hexagon socket head screw 411e and the spring washer 412e.

[0033] The sealing assembly 31 includes a frameless oil seal 311, an oil seal pressure plate 312, and an O-ring 313. The oil seal pressure plate 312 is used to fix the frameless oil seal 311 to prevent leakage of lubricating oil or hydraulic oil and keep the inside of the thrust seat device 5 clean and lubricated; the frameless oil seal 311 is a special oil seal without a metal frame, which is used to prevent liquid leakage and has better elasticity and sealing performance.

[0034] In this embodiment, the drive system 1 uses the hydraulic oil motor 11 as the driving force, and its output end is connected to the reducer 12 through a bearing. The hydraulic oil motor 11 and the reducer 12 are connected and fixed using a hexagon socket head screw 411a, and a spring washer 412a is used to increase the preload force at the connection to prevent the connection from loosening, while also playing a role in shock absorption and buffering. It is worth mentioning that the reducer 12 can achieve the effect of deceleration and distance increase at the input end of the hydraulic oil motor 11, adjust the speed and flow requirements during the plasticizing drive process, and finally realize the conversion and transmission of the hydraulic energy at the input end of the hydraulic oil motor 11 to the mechanical energy at the output end of the reducer 12.

[0035] The transmission system 2 includes a top shaft 24, a harv 25 and a bearing group, wherein the bearing group is composed of a tapered roller bearing 21, a thrust spherical roller bearing 22 and a cylindrical roller bearing 23, and a top shaft 24 passes through the bearing groups. The bearing group mainly supports and positions the top shaft 24 in the injection molding machine, which can ensure the stable rotation of the top shaft 24 and avoid radial or axial displacement, and can also withstand the load and vibration during the operation of the injection molding machine to ensure the stability of the transmission system.

[0036] The top shaft 24 includes an integrally arranged drive system connection end and a screw barrel connection end, a cylindrical roller bearing seat is arranged near the screw barrel connection end, a tapered roller bearing seat is arranged at the drive system connection end, a thrust spherical roller bearing seat is arranged at the middle position of the top shaft 24, and a reduction shaft connection cavity is arranged inside the drive system connection end, and a screw barrel connection cavity is arranged inside the screw barrel connection end.

[0037] The reducer comprises a reducer power input end and a reducer power output end. An integrated cavity is arranged at the reducer power input end, an input shaft end is arranged inside the integrated cavity, and an output shaft end is arranged at the reducer power output end.

[0038] The output end of the hydraulic oil motor 11 is provided with an output cavity, the hydraulic oil motor 11 is integrated in the integrated cavity of the reducer, and the input shaft end of the reducer is passed through the output cavity of the hydraulic oil motor and is connected to the transmission through a bearing. The output end of the hydraulic oil motor is connected and fixed to the end of the integrated cavity of the reducer by a hexagon socket head screw 411a.

[0039] The output end shaft of the reducer is inserted into the reduction shaft connecting cavity of the top shaft.

[0040] The tapered roller bearing 21 is located at one end of the top shaft close to the reducer 12. The tapered roller bearing 21 and the outer shell of the thrust seat 52 are fixedly connected by a hexagon socket head screw 411c and a locking nut 441, and a spring washer 412c is used to prevent loosening.

[0041] The cylindrical roller bearing 23 is located at one end of the top shaft 24 close to the thrust seat end cover 51. The cylindrical roller bearing 23 and the thrust seat end cover 51 are fixedly connected by a hexagon socket head screw, and a spring washer 412 is used to prevent loosening. An O-ring 313 is used to fill the gap between the thrust seat end cover 51 and the cylindrical roller bearing 23 to prevent liquid or gas leakage; the thrust spherical roller bearing 22 is located in the middle of the bearing group, and the thrust spherical bearing 22 is mounted on the top shaft 24 to form an interference fit, and then fixed using locking washers, locking nuts and other devices.

[0042] The top shaft 24 is a transmission component, one end of which is connected to the reducer 12, and the other end is assembled and connected to the tail end of the screw barrel through the Harv 25. When the reducer 12 is running, it transmits the rotational power to the screw barrel through the top shaft 24, thereby driving the screw barrel to work.

[0043] The Harv 25 is used as a fastener and connector to fix the tail of the screw barrel and one end of the top shaft 24. The driving system 1 outputs a driving force to rotate the top shaft 24, which then drives the screw connected to the Harv 25 to rotate, thereby realizing the material storage action.

[0044] The top shaft 24, the tapered roller bearing 21, the thrust spherical roller bearing 22, and the cylindrical roller bearing 23 are combined to form a transmission system 2, which is installed inside the thrust seat device 5, and the transmission system 2 is connected to the reducer and the tail end of the screw barrel. It is worth mentioning that the inner and outer rings and rollers of the tapered roller bearing 21 form a certain cone angle, which is particularly suitable for bearing a combined load dominated by radial loads; the raceway surface of the seat ring of the thrust spherical roller bearing 22 is a spherical surface centered on a point consistent with the central axis of the bearing, and the roller is spherical, so it has an automatic self-aligning function and is good at bearing axial loads; the rollers of the cylindrical roller bearing 23 are arranged in parallel, and are used to bear radial loads and a certain degree of axial loads. The main function of the bearings All three types of bearings have good operating accuracy and stability, and are highly adaptable to the working environment. This combination can well cope with the complex and changeable load conditions of the injection molding machine.

[0045] like Figure 5 As shown, according to the specific embodiment, the plasticizing drive device of the injection molding machine can achieve the following actions through the coordinated action of the drive system 1, the transmission system 2 and the thrust seat device 5: the pressurized oil enters the hydraulic oil motor 11, and the hydraulic energy is converted into mechanical energy through the rotation of the rotor. The reducer 12 reduces the output speed of the hydraulic oil motor 11 and increases the torque, and then drives the top shaft 24 to rotate through the bearing group. When the storage space at the head of the screw is filled with molten material, the top shaft 24 drives the screw to rotate under the support of the entire movement of the thrust seat device 5, and the storage action can be performed.

[0046] Embodiment 2: exist Figure 6 In the embodiment shown, a plasticizing drive mechanism of a PVC injection molding machine is provided. The structure of other components in this embodiment is basically the same as that in the embodiment, except that: A plasticizing drive mechanism of a PVC injection molding machine includes: an integrally movable thrust seat device 5, a transmission system 2 for connecting with a screw barrel assembly is integrated inside the thrust seat device 5, and the transmission system 2 is driven to rotate by a drive system 1 jointly driven by a hydraulic oil motor and a reducer.

[0047] The driving system 1 comprises an independent hydraulic oil motor 11 and a reducer 12 connected to the output end of the hydraulic oil motor.

[0048] The driving system 1 uses a single hydraulic oil motor 11 as a driving component, which is connected to the reducer 12 through an internal bearing to achieve the conversion and transmission of hydraulic energy at the input end of the hydraulic oil motor to mechanical energy at the output end of the reducer.

[0049] The transmission system 2 includes a top shaft 24, and the top shaft 24 is integrally formed at the output end of the reduction shaft of the reducer.

[0050] The other end of the top shaft is used to connect with the screw barrel assembly and drive the screw barrel assembly to rotate and store materials. The top shaft 24 is a transmission component. The top shaft and the output end of the reduction shaft are directly integrated to reduce assembly errors and effectively improve transmission accuracy. The top shaft 24 is assembled and connected with the tail end of the screw barrel through the Harv 25. The reducer 12 runs to transmit the rotational power to the screw barrel through the top shaft 24, thereby driving the screw barrel to work.

[0051] The thrust seat device 5 comprises a thrust seat end cover 51 and a thrust seat 52. The thrust seat 52 is provided with a top shaft installation cavity therein.

[0052] In this embodiment, the reducer bracket 53 and the thrust seat 52 are integrally formed.

[0053] The thrust seat 52 is used to support and transmit the axial thrust transmitted by the top shaft 24 and the bearing group. The reducer 12 is connected and fixed to the upper part of the thrust seat 52 by connecting fasteners, and the bottom of the thrust seat 52 is connected and fixed to the reducer bracket 53 by connecting fasteners. The reducer and the reducer bracket are fixedly connected using full-thread hexagonal bolts with hexagonal nuts, and the pre-tightening force is applied by tightening the nuts to enhance the reliability and durability of the connection.

[0054] The reducer bracket 53 is used to install and fix the reducer to ensure that the reducer can run stably.

[0055] The bottom of the thrust seat 52 and the reducer bracket 53 are provided with a sliding groove.

[0056] The thrust seat end cover 51 is installed at one end of the thrust seat 52, and is used to seal and protect the parts inside the thrust seat, and bear the axial thrust. The thrust seat end cover is connected and fixed to the thrust seat by connecting fasteners, and the oil seal pressure plate is connected and fixed to the thrust seat end cover by connecting fasteners.

[0057] Specifically, the thrust seat end cover 51 sealing cover is arranged at one end of the thrust seat facing the screw barrel. A sealing assembly is arranged between the thrust seat end cover and the top shaft 24. The thrust seat end cover 51 is installed at one end of the thrust seat 52, and is used to seal and protect the parts inside the thrust seat 52, while bearing the axial thrust. The thrust seat end cover 51 and the thrust seat 52 are fixedly connected and prevented from loosening by the hexagon socket head screw 411d and the spring washer 412d, and the oil seal pressure plate 312 and the thrust seat end cover 51 are fixedly connected and prevented from loosening by the hexagon socket head screw 411e and the spring washer 412e.

[0058] The sealing assembly 31 includes a frameless oil seal 311, an oil seal pressure plate 312, and an O-ring 313. The oil seal pressure plate 312 is used to fix the frameless oil seal 311 to prevent leakage of lubricating oil or hydraulic oil and keep the inside of the thrust seat device 5 clean and lubricated; the frameless oil seal 311 is a special oil seal without a metal frame, which is used to prevent liquid leakage and has better elasticity and sealing performance.

[0059] As described in the specific embodiment, the plasticizing drive device of the injection molding machine can achieve the following actions through the coordinated action of the drive system 1, the transmission system 2 and the thrust seat device 5: start the hydraulic oil motor 11, the pressurized oil enters the hydraulic oil motor 11, and the hydraulic energy is converted into mechanical energy through the rotation of the rotor of the hydraulic oil motor 11. The reducer 12 reduces the output speed of the hydraulic oil motor 11 and increases the torque, driving the top shaft 24 to rotate. When the storage space at the head of the screw is filled with molten material, the top shaft 24 moves with the thrust seat device 5 to push the screw forward to achieve the injection operation.

[0060] The plasticizing drive mechanism of the PVC injection molding machine in the above embodiment mainly includes a drive system, a transmission system, a sealing assembly, connecting fasteners and a thrust seat device. The drive system includes an independent hydraulic oil motor and a reducer for joint driving; the transmission system includes a top shaft and a group of bearings, and the bearing group includes a tapered roller bearing, a thrust spherical roller bearing, and a cylindrical roller bearing, which bear the axial and radial loads of the transmission rod after combined installation; the sealing assembly includes a skeleton-free oil seal, an oil seal pressure plate, and an O-ring; the connecting fasteners include hexagon socket head screws, spring washers, studs, stud nuts, full-threaded hexagon head bolts, hexagon nuts, ordinary nuts, etc.; the thrust seat device includes a thrust seat end cover, a thrust seat, a reducer bracket, etc. At the same time, according to the actual application needs, the top shaft and the reducer shaft can be separated and assembled, or the top shaft and the reducer shaft can be set as an integrated structure, thereby reducing assembly errors and improving transmission efficiency and accuracy.

[0061] The plasticizing drive mechanism of the PVC injection molding machine has a reasonable structure and is easy to assemble. It selects a new drive mode to replace the traditional solution, achieving the function of reducing costs and increasing efficiency. It solves the problems of the dual oil motor reducing the output speed and overall system efficiency, increasing energy consumption and cost, and the parallel motor also needs to arrange a separate hydraulic system, causing uneven load distribution and reducing system reliability. At the same time, it solves the problem of the servo motor with reducer solution, which has the problems of large-sized servo motors and reducers being expensive, complex systems, reduced efficiency, and high technical barriers.

[0062] Compared with the traditional dual oil motor and servo motor with reducer drive design, the present invention has the following gain effect: a single larger oil motor is driven in conjunction with the reducer to obtain greater driving force or achieve specific motion control. The system is simple, which helps to improve transmission efficiency and reduce energy consumption. It also broadens its adaptability range and performs very well in cost control.

[0063] Finally, it should be noted that the above examples are only specific embodiments of the present invention. Obviously, the present invention is not limited to the above examples, and there may be multiple variations, such as changing the installation position of the oil cylinder and the motor, changing the motion form of the injection mold, etc. All variations that can be directly derived or associated with the content disclosed by a person skilled in the art should be considered to be within the scope of protection of the present invention.

Claims

1. A plasticizing drive mechanism for a PVC injection molding machine, characterized in that: The invention comprises an integrally movable thrust seat device (5), wherein a transmission system (2) for connecting to a screw barrel assembly is integrated inside the thrust seat device (5), and the transmission system (2) is driven to rotate by a drive system (1); the drive system (1) comprises an independent hydraulic oil motor (11) and a reducer (12) connected to the hydraulic oil motor to realize joint drive, and the transmission system (2) comprises a top shaft (24) connected to the reducer.

2. The plasticizing drive mechanism of the PVC injection molding machine according to claim 1, characterized in that: The hydraulic oil motor (11) is integrated at the input end of the reducer and is transmission-connected to the reducer, thereby realizing the conversion and transmission of hydraulic energy at the input end of the hydraulic oil motor to mechanical energy at the output end of the reducer.

3. The plasticizing drive mechanism of the PVC injection molding machine according to claim 2, characterized in that: The reduction shaft of the reducer (12) comprises an input end (121) and an output end (122); the top shaft (24) is arranged separately from the reducer; and the output end of the reduction shaft is connected to the top shaft (24).

4. The plasticizing drive mechanism of the PVC injection molding machine according to claim 3, characterized in that: The top shaft (24) comprises a drive system connection end (241) and a screw barrel connection end (242); a reduction shaft connection cavity (243) is provided inside the drive system connection end (241), and a screw barrel connection cavity (244) is provided inside the screw barrel connection end (242).

5. The plasticizing drive mechanism of the PVC injection molding machine according to claim 2, characterized in that: The reduction shaft of the reducer comprises an input end (121) and an output end (122), and the top shaft (24) is integrally arranged with the output end (122) of the reduction shaft.

6. The plasticizing drive mechanism of a PVC injection molding machine according to any one of claims 1 to 5, characterized in that: The top shaft (24) is rotatably connected to the thrust seat device (5) via a set of bearing groups, and the bearing groups support and position the top shaft.

7. The plasticizing drive mechanism of the PVC injection molding machine according to claim 6, characterized in that: The bearing group comprises a tapered roller bearing (21), a thrust spherical roller bearing (22) and a cylindrical roller bearing (23); the cylindrical roller bearing (23) is located at one end of the top shaft (24) close to the screw barrel assembly; the thrust spherical roller bearing (22) is located in the middle of the bearing group; the tapered roller bearing (21) is located at one end of the top shaft close to the reducer (12) and is fixedly connected to the thrust seat device.

8. The plasticizing drive mechanism of a PVC injection molding machine according to any one of claims 1 to 5, characterized in that: The thrust seat device (5) comprises a thrust seat end cover (51) and a thrust seat (52), a sealing assembly (31) being arranged between the thrust seat end cover (51) and the top shaft (24); and a full-shift slide groove (54) being arranged at the bottom of the thrust seat (52).

9. The plasticizing drive mechanism of a PVC injection molding machine according to any one of claims 1 to 5, characterized in that: The reducer (12) is supported by a reducer bracket (53) and is integrally connected to the thrust seat device (5).

10. A working method of a plasticizing drive mechanism of a PVC injection molding machine according to any one of claims 1 to 9, characterized in that The method comprises the following steps: starting the hydraulic oil motor, pressurized oil entering the hydraulic oil motor, converting hydraulic energy into mechanical energy through the rotation of the rotor of the hydraulic oil motor, and the reducer reducing the speed and increasing the torque of the output speed of the hydraulic oil motor; the reducer drives the top shaft to rotate, and drives the screw to rotate. When the storage space at the head of the screw is filled with molten material, the top shaft and the thrust seat device move together to push the screw forward to realize the injection action.

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