A feeding mechanism for polishing the surface of injection molded parts

Abstract

The present invention is applicable to the technical field of injection molding processing equipment components, and provides a feeding mechanism for surface polishing of injection molding parts, including a mounting seat, a peripheral plate fixedly mounted on one side of the mounting seat, two spaces spaced apart in an upper and lower direction provided in the peripheral plate, two conveying mechanisms spaced apart in an upper and lower direction provided in the peripheral plate, the conveying mechanism being used to convey injection molding parts, an entrance being provided at the upper end of the peripheral plate, and automatic transportation of injection molding parts is achieved through the upper and lower conveying mechanisms, after the upper layer completes the first end face polishing, the injection molding parts automatically fall into the lower layer conveying mechanism through the connecting port, and the second end face polishing is performed, forming a continuous production process, reducing manual intervention, and improving production efficiency. The polished injection molding parts are automatically discharged through the outlet, eliminating the need for manual removal, further shortening the production cycle. By designing the upper and lower conveying mechanisms and the connecting port, the automatic flipping of the injection molding parts during transportation is achieved, and double-end face polishing can be completed without the need for additional equipment, simplifying the production process.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding processing equipment components, and in particular relates to a feeding mechanism for polishing the surface of injection molding parts. Background Art

[0002] Surface polishing of injection molded parts is an important post-processing step after injection molding. It refers to the processing of the surface of injection molded parts by physical or chemical methods to improve their appearance quality, dimensional accuracy and performance to meet product use requirements.

[0003] In the prior art, belt sanders are used to polish molded parts to eliminate surface defects such as flash (burrs), parting lines, flow marks, silver streaks, and sink marks generated during the molding process. This results in a smoother, flatter, and more aesthetically pleasing surface, enhancing the product's visual quality and quality. When using a belt sander to polish the surface of an injection-molded part, workers must manually hold the part and place the surface to be polished against the sanding belt in the machine. This operation exposes the operator to multiple hazards. The sanding belt rotates at high speeds (typically 500-3000 rpm), and fingers or clothing can become entangled between the sanding belt and the contact wheel, resulting in crushing or cuts. Plastic debris and abrasive particles generated during the polishing process can fly at high speeds, striking eyes or skin, causing physical damage. Furthermore, manual intervention leads to poor processing consistency. The difficulty in applying consistent pressure can result in deviations in polishing volume (over ±0.1 mm), impacting the assembly accuracy of the molded part and its associated components. The change of holding angle will also cause the polishing surface to deviate from the target area, resulting in local over-grinding or under-grinding. In order to solve the above problems, it is necessary to design a feeding mechanism for polishing the surface of injection molded parts. Summary of the Invention

[0004] The present invention provides a feeding mechanism for polishing the surface of an injection molded part, aiming to solve the problems of currently manually holding the injection molded part and sticking the surface to be polished of the injection molded part on the sanding belt in the sanding belt machine, which has great hidden dangers and low processing precision.

[0005] The present invention is implemented as follows: a feeding mechanism for surface polishing of injection molded parts includes a mounting seat, an outer plate is fixedly mounted on one side of the mounting seat, two spaces spaced apart in an upper and lower direction are provided in the outer plate, two conveying mechanisms spaced apart in an upper and lower direction are provided in the outer plate, the conveying mechanisms are used to convey injection molded parts, and the conveying mechanisms are all mounted on the mounting seat.

[0006] An entrance is provided at the upper end of the outer plate, and the entrance passes through the outer plate. Two processing openings spaced apart from each other are provided on one side of the outer plate. A connecting opening is provided in the middle section of the outer plate, and the connecting opening passes through the outer plate and is used to connect to the internal space of the outer plate. A channel is provided in the connecting opening, and the channel is fixedly connected to the outer plate. An outlet is provided at the lower end of the outer plate, and the outlet passes through the outer plate.

[0007] Two push-up assemblies spaced apart from each other are provided in the outer peripheral plate, and the push-up assemblies are used to drive the push rod to move.

[0008] The pushing assembly includes a first eccentric wheel arranged in the outer plate, a first eccentric shaft is fixedly mounted on the first eccentric wheel, one end of the first eccentric shaft is rotatably mounted on a mounting seat, a second servo motor is fixedly mounted on the mounting seat, and the output shaft of the second servo motor is fixedly connected to the first eccentric shaft.

[0009] Preferably, the conveying mechanism includes a plurality of storage grooves distributed in a circular array, the storage grooves are all located in the outer plate, the storage grooves are used to place the injection molded parts to be polished, the storage grooves are fixedly installed with a groove body, and a connecting rod is provided between two adjacent groove bodies, and the end of the connecting rod is fixedly connected to the groove body opposite thereto, and a first rotating shaft is rotatably installed on the mounting seat, and a connecting frame is fixedly installed on the end of the first rotating shaft, and the connecting frame is fixedly connected to a plurality of connecting rods, and the outer plate can block the storage groove port, and a first servo motor is fixedly installed on the mounting seat, and the output shaft of the first servo motor is fixedly connected to the first rotating shaft, and a controller is fixedly installed on the mounting seat, and the first servo motor is electrically connected to the controller, and the controller is used to control the operation of the first servo motor.

[0010] Preferably, a push rod passes through the trough body, one end of the push rod extends into the trough body and penetrates into the receiving groove, an annular piece is sleeved and fixedly installed on the push rod, and a spring is provided on the outer sleeve of the push rod, and both ends of the spring are fixedly connected to the receiving groove and the annular piece respectively.

[0011] Preferably, the second servo motor is electrically connected to a controller, and the controller is used to control the operation of the second servo motor.

[0012] Preferably, a reset mechanism is provided on one side of the peripheral plate, and the reset mechanism is used to push the injection molded part in the receiving groove to reset.

[0013] Preferably, the reset mechanism includes two rollers spaced apart in an upper and lower manner, one end of the roller is rotatably mounted on a mounting seat, an abrasive belt is installed between the two rollers, a movable frame is provided on one side of the abrasive belt, a tensioning roller is rotatably mounted in the movable frame, the abrasive belt passes through the tensioning roller, an electric telescopic rod is fixedly mounted on the mounting seat, the output end of the electric telescopic rod is fixedly mounted on the movable frame, a third servo motor is fixedly mounted on the mounting seat, and the output shaft of the third servo motor is fixedly connected to the roller at the lower end.

[0014] Preferably, the electric telescopic rod is electrically connected to a controller, and the controller is used to control the operation of the electric telescopic rod. The third servo motor is electrically connected to the controller, and the controller is used to control the operation of the third servo motor.

[0015] Preferably, the reset mechanism also includes two second eccentric wheels spaced apart from each other, the second eccentric wheels are arranged inside the sanding belt, a second eccentric shaft is fixedly mounted on the second eccentric wheel, the second eccentric shaft is rotatably mounted on the mounting seat, two fourth servo motors are fixedly mounted on the mounting seat, the output shaft of the fourth servo motor is fixedly connected to the second eccentric shaft, the fourth servo motor is electrically connected to the controller, and the controller is used to control the operation of the fourth servo motor.

[0016] Compared with the related art, the feeding mechanism for surface polishing of injection molded parts provided by the present invention has the following beneficial effects:

[0017] The automatic transfer of injection molded parts is achieved through two conveyor mechanisms, one on top and one on the bottom. After the first end face polishing is completed on the upper level, the part automatically drops through a connecting port onto the lower conveyor mechanism for the second end face polishing. This creates a continuous production process, reduces manual intervention, and improves production efficiency. Polished injection molded parts are automatically discharged through an outlet, eliminating the need for manual removal and further shortening production cycle time. The design of the upper and lower conveyor mechanisms and connecting port allows for automatic flipping of injection molded parts during transfer, enabling double-end face polishing without the need for additional equipment, streamlining the production process. The loading mechanism can be independent of the polishing equipment or integrated into a polishing mechanism such as a grinding wheel, flexibly adapting to different production needs.

[0018] A second servo motor drives the first eccentric, pushing the ejector pin to precisely eject the molded part into the machining center. This ensures consistent contact between the polishing surface and the abrasive belt, minimizing fluctuations in polishing volume and improving polishing consistency. A spring-loaded return mechanism ensures the ejector pin automatically retracts after polishing is complete, preventing damage to the molded part caused by excessive ejection during the polishing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0020] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0021] Figure 3 The structure of the present invention is schematically shown Figure 3 ;

[0022] Figure 4 It is a partial structural enlarged schematic diagram of the present invention;

[0023] Figure 5 It is a partial enlarged schematic diagram of the structure of the peripheral plate in the present invention;

[0024] Figure 6 Schematic diagram of the peripheral plate and channel in the present invention;

[0025] Figure 7 It is an enlarged cross-sectional view of a portion of the structure of the conveying mechanism of the present invention;

[0026] Figure 8 For the present invention Figure 7 An enlarged schematic diagram of part of the structure at the middle tank;

[0027] Figure 9 For the present invention Figure 7 Enlarged structural diagram at point A in the middle.

[0028] In the figure: mounting seat 1, outer plate 2, inlet 3, processing port 4, connecting port 5, channel 6, outlet 7, receiving slot 8, slot body 9, connecting rod 10, first rotating shaft 11, connecting frame 12, first servo motor 13, controller 14, push rod 15, annular piece 16, spring 17, first eccentric wheel 18, first eccentric shaft 19, second servo motor 20, rotating roller 21, sanding belt 22, movable frame 23, tensioning roller 24, electric telescopic rod 25, third servo motor 26, second eccentric wheel 27, second eccentric shaft 28, fourth servo motor 29. DETAILED DESCRIPTION

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0030] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] The preferred embodiment of the feeding mechanism for polishing the surface of injection molded parts provided by the present invention is as follows: Figures 1 to 9 As shown:

[0032] A feeding mechanism for polishing the surface of injection molded parts comprises a mounting base 1, with a peripheral plate 2 fixedly mounted on one side of the mounting base 1. The peripheral plate 2 is provided with two spaces spaced apart vertically therein, and two conveying mechanisms spaced apart vertically therein, which are used to convey the injection molded parts. The conveying mechanisms are both mounted on the mounting base 1. An inlet 3 is provided at the upper end of the peripheral plate 2, which passes through the peripheral plate 2. Two processing ports 4 spaced apart vertically are provided on one side of the peripheral plate 2. A connecting port 5 is provided in the middle section of the peripheral plate 2, which passes through the peripheral plate 2 and is used to connect to the internal space of the peripheral plate 2. A channel 6 is provided within the connecting port 5 and is fixedly connected to the peripheral plate 2. An outlet 7 is provided at the lower end of the peripheral plate 2, which passes through the peripheral plate 2.

[0033] Two jacking assemblies, spaced one above the other, are positioned within the outer plate 2. These assemblies are used to drive the jack rod 15. These assemblies include a first eccentric wheel 18, mounted within the outer plate 2. A first eccentric shaft 19 is fixedly mounted to the first eccentric wheel 18. One end of the first eccentric shaft 19 is rotatably mounted on the mounting base 1. A second servo motor 20 is fixedly mounted on the mounting base 1. The output shaft of the second servo motor 20 is fixedly connected to the first eccentric shaft 19. The second servo motor 20 is electrically connected to the controller 14, which controls the operation of the second servo motor 20.

[0034] Among them, the conveying mechanism includes a plurality of storage grooves 8 distributed in a circular array, and the storage grooves 8 are all located in the outer plate 2. The storage grooves 8 are used to place the injection molded parts to be polished, and a groove body 9 is fixedly installed on the storage groove 8. A connecting rod 10 is provided between two adjacent groove bodies 9. The end of the connecting rod 10 is fixedly connected to the groove body 9 opposite to it. A first rotating shaft 11 is rotatably installed on the mounting seat 1, and a connecting frame 12 is fixedly installed on the end of the first rotating shaft 11. The connecting frame 12 is fixedly connected to multiple connecting rods 10. The outer plate 2 can block the port of the storage groove 8. A first servo motor 13 is fixedly installed on the mounting seat 1, and the output shaft of the first servo motor 13 is fixedly connected to the first rotating shaft 11. A controller 14 is fixedly installed on the mounting seat 1, and the first servo motor 13 is electrically connected to the controller 14. The controller 14 is used to control the operation of the first servo motor 13.

[0035] Among them, a push rod 15 passes through the groove body 9, one end of the push rod 15 extends into the groove body 9 and penetrates into the receiving groove 8, an annular piece 16 is sleeved and fixedly installed on the push rod 15, and a spring 17 is provided on the outer sleeve of the push rod 15, and the two ends of the spring 17 are fixedly connected to the receiving groove 8 and the annular piece 16 respectively.

[0036] The mounting base 1 is screwed onto the external polishing equipment. The block-shaped injection molded parts to be polished are added through the inlet 3. The injection molded parts pass through the inlet 3 and fall into the uppermost storage slot 8. The upper first servo motor 13 is controlled by the controller 14 to operate. The upper first servo motor 13 operates and drives the first rotating shaft 11 and the connecting frame 12 to rotate, causing the multiple storage slots 8 to rotate synchronously. The storage slots 8 containing the injection molded parts rotate to the upper processing port 4. During the rotation of the storage slots 8, the outer plate 2 can block the end of the storage slots 8 to prevent the injection molded parts in the storage slots 8 from falling out of the storage slots 8 during the rotation process.

[0037] The controller 14 controls the operation of the second servo motor 20 above. The second servo motor 20 drives the first eccentric shaft 19 to rotate. The first eccentric wheel 18 on the first eccentric shaft 19 rotates and pushes the push rod 15 to move. The push rod 15 moves toward the injection molded part. The spring 17 is compressed, and the push rod 15 pushes the injection molded part out of the processing port 4, causing one end face of the injection molded part to leak out of the processing port 4. During this time period, the injection molded part is polished. After polishing is completed, the first eccentric wheel 18 is reset, and the elastic force of the spring 17 drives the push rod 15 to reset, and the injection molded part is then placed back into the storage tank 8. The first servo motor 13 above then continues to rotate and drives the storage tank 8 containing the injection molded part to rotate to the connecting port 5. Under the action of gravity, the injection molded part passes through the channel 6 and falls into the storage tank 8 below. At this time, the other side of the injection molded part in the storage tank 8 is set to face outward.

[0038] Next, the controller 14 controls the first servo motor 13 and the second servo motor 20 below to repeat the above-mentioned operation, thereby polishing the other end face of the injection molded part. When the injection molded part rotates to the outlet 7 at the lower end, the injection molded part falls out of the storage groove 8 under the action of gravity, passes through the outlet 7 and is discharged from the device. Subsequently, the injection molded part to be polished is placed back into the inlet 3, and the above-mentioned operation is repeated, thereby continuously polishing the injection molded part. The outer plate 2 seals the polishing area to prevent the injection molded part from falling off during transportation, while reducing the spillage of polishing dust and debris, improving the working environment, and reducing occupational health risks.

[0039] The device can replace manual polishing of injection molded parts, realize the transfer of injection molded parts, avoid direct exposure of operators to multiple sources of danger, and play a protective role for workers. During the transfer process, the injection molded parts can be automatically turned over to polish different surfaces of the injection molded parts.

[0040] In a further preferred embodiment of the present invention:

[0041] A reset mechanism is provided on one side of the outer plate 2, which is used to reset the injection molded parts within the storage slot 8. The reset mechanism includes two rollers 21 spaced apart from each other. One end of each roller 21 is rotatably mounted on the mounting base 1. An abrasive belt 22 is mounted between the two rollers 21. A movable frame 23 is provided on one side of the abrasive belt 22. A tensioning roller 24 is rotatably mounted within the movable frame 23, through which the abrasive belt 22 passes. An electric telescopic rod 25 is fixedly mounted on the mounting base 1, with its output end fixedly mounted on the movable frame 23. A third servo motor 26 is fixedly mounted on the mounting base 1, with its output shaft fixedly connected to the lower roller 21. The electric telescopic rod 25 is electrically connected to the controller 14, which controls its operation. The third servo motor 26 is also electrically connected to the controller 14, which controls its operation.

[0042] The reset mechanism also includes two second eccentric wheels 27 spaced apart in an upper and lower manner. The second eccentric wheels 27 are arranged inside the sanding belt 22. A second eccentric shaft 28 is fixedly mounted on the second eccentric wheel 27. The second eccentric shaft 28 is rotatably mounted on the mounting base 1. Two fourth servo motors 29 are fixedly mounted on the mounting base 1. The output shaft of the fourth servo motor 29 is fixedly connected to the second eccentric shaft 28. The fourth servo motor 29 is electrically connected to the controller 14. The controller 14 is used to control the operation of the fourth servo motor 29.

[0043] In this embodiment, the feeding mechanism of the present application can also be integrated into the grinding mechanism of the grinding wheel machine. When the ejector rod 15 ejects the injection molded part from the processing port 4, causing one end surface of the injection molded part to leak out of the processing port 4, the injection molded part is polished during this period of time. Specifically, the controller 14 controls the operation of the third servo motor 26, which drives the lower roller 21 to rotate, and cooperates with the tensioning roller 24 to tension the abrasive belt 22. The abrasive belt 22 can run around the roller 21 and the tensioning roller 24, so that the high-speed moving abrasive belt 22 contacts the end surface of the injection molded part and performs the grinding work. When grinding is completed, the abrasive belt 22 stops rotating, and the controller 14 controls the electric telescopic rod 25 to operate, which drives the movable frame 23 to move toward the outer plate 2. The tensioning roller 24 no longer tensions the abrasive belt 22, and the abrasive belt 22 is in a relaxed state. The controller 14 then controls the fourth servo motor 29 to operate, which drives the second eccentric shaft 28 and the second eccentric wheel 27 to rotate. The second eccentric wheel 27 contacts and squeezes the abrasive belt 22. The second eccentric wheel 27 squeezes the injection molded part through the abrasive belt 22, thereby pushing the injection molded part into the storage groove 8. After grinding is completed, the injection molded part can automatically return to the storage groove 8. Afterwards, the second eccentric wheel 27 and the tensioning roller 24 are reset, and the abrasive belt 22 returns to the tensioned state.

[0044] The present application realizes the automatic transportation of injection molded parts through two upper and lower conveying mechanisms. After the first end face polishing is completed on the upper layer, the injection molded parts automatically fall into the lower conveying mechanism through the connecting port 5 for the second end face polishing, forming a continuous production process, reducing manual intervention, and improving production efficiency. The polished injection molded parts are automatically discharged through the outlet 7, and there is no need for manual removal, further shortening the production cycle. Through the design of the upper and lower conveying mechanisms and the connecting port 5, the automatic flipping of the injection molded parts during the transportation process is realized, and double-end face polishing can be completed without additional equipment, simplifying the production process. The feeding mechanism can be independent of the polishing equipment, or it can be integrated into a polishing mechanism such as a grinding wheel machine, and flexibly adapt to different production needs.

[0045] A second servo motor 20 drives the first eccentric 18, pushing the ejector pin 15 to precisely eject the molded part into the processing opening 4. This ensures consistent contact between the polishing surface and the abrasive belt 22, minimizing fluctuations in polishing volume and improving polishing consistency. The elastic return function of the spring 17 ensures that the ejector pin 15 automatically retracts after polishing is complete, preventing damage to the molded part caused by excessive ejection of the ejector pin 15 during the polishing process.

[0046] It is worth noting that the circuits, electronic components and modules involved in the present invention are all existing technologies and can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to software and methods.

[0047] In the several embodiments provided in this application, it should be understood that the disclosed devices can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the above-mentioned units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or communication connection shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or units can be in the form of telecommunications or other forms.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the invention. Obviously, the embodiments described are only some embodiments of the present invention, rather than all embodiments. Based on these embodiments, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in this field can still combine, add, delete or make other adjustments to the features in the various embodiments of the present invention according to the circumstances without conflict, without making creative work, so as to obtain different other technical solutions that do not deviate from the concept of the present invention in essence, and these technical solutions also fall within the scope of protection of the present invention.

Claims

1. A feeding mechanism for polishing the surface of an injection molded part, comprising a mounting seat (1), characterized in that: A peripheral plate (2) is fixedly mounted on one side of the mounting seat (1), and two spaces spaced apart from each other are provided in the peripheral plate (2). Two conveying mechanisms spaced apart from each other are provided in the peripheral plate (2), and the conveying mechanisms are used to convey injection molded parts. The conveying mechanisms are all mounted on the mounting seat (1); An inlet (3) is provided at the upper end of the peripheral plate (2), and the inlet (3) passes through the peripheral plate (2). Two processing openings (4) spaced apart from each other are provided on one side of the peripheral plate (2). A connecting opening (5) is provided in the middle section of the peripheral plate (2), and the connecting opening (5) passes through the peripheral plate (2) and is used to connect to the internal space of the peripheral plate (2). A channel (6) is provided in the connecting opening (5), and the channel (6) is fixedly connected to the peripheral plate (2). An outlet (7) is provided at the lower end of the peripheral plate (2), and the outlet (7) passes through the peripheral plate (2). Two push-up assemblies spaced apart from each other are provided in the outer plate (2), and the push-up assemblies are used to drive the push rod (15) to move; The jacking assembly includes a first eccentric wheel (18) arranged in the outer plate (2), a first eccentric shaft (19) is fixedly mounted on the first eccentric wheel (18), one end of the first eccentric shaft (19) is rotatably mounted on the mounting seat (1), a second servo motor (20) is fixedly mounted on the mounting seat (1), and an output shaft of the second servo motor (20) is fixedly connected to the first eccentric shaft (19); The conveying mechanism comprises a plurality of receiving grooves (8) distributed in a circumferential array, wherein the receiving grooves (8) are all located in the outer plate (2), and the receiving grooves (8) are used to place the injection molded parts to be polished. A groove body (9) is fixedly mounted on each of the receiving grooves (8), and a connecting rod (10) is provided between two adjacent groove bodies (9). The end of the connecting rod (10) is fixedly connected to the groove body (9) opposite thereto, and a first rotating shaft (11) is rotatably mounted on the mounting seat (1), and a first rotating shaft (11) is fixedly mounted on the end thereof. A connecting frame (12), wherein the connecting frame (12) is fixedly connected to a plurality of connecting rods (10), the peripheral plate (2) can block a port of the receiving slot (8), a first servo motor (13) is fixedly mounted on the mounting seat (1), an output shaft of the first servo motor (13) is fixedly connected to the first rotating shaft (11), a controller (14) is fixedly mounted on the mounting seat (1), the first servo motor (13) is electrically connected to the controller (14), and the controller (14) is used to control the operation of the first servo motor (13); A reset mechanism is provided on one side of the peripheral plate (2), and the reset mechanism is used to push the injection molded part in the receiving groove (8) to reset; The reset mechanism comprises two rollers (21) spaced apart from each other, one end of the rollers (21) being rotatably mounted on the mounting seat (1), an abrasive belt (22) being mounted between the two rollers (21), a movable frame (23) being provided on one side of the abrasive belt (22), a tensioning roller (24) being rotatably mounted in the movable frame (23), the abrasive belt (22) passing through the tensioning roller (24), an electric telescopic rod (25) being fixedly mounted on the mounting seat (1), an output end of the electric telescopic rod (25) being fixedly mounted on the movable frame (23), a third servo motor (26) being fixedly mounted on the mounting seat (1), an output shaft of the third servo motor (26) being fixedly connected to the roller (21) at the lower end; The reset mechanism further includes two second eccentric wheels (27) spaced apart from each other, the second eccentric wheels (27) being arranged inside the sanding belt (22), a second eccentric shaft (28) being fixedly mounted on the second eccentric wheel (27), the second eccentric shaft (28) being rotatably mounted on the mounting seat (1), two fourth servo motors (29) being fixedly mounted on the mounting seat (1), an output shaft of the fourth servo motor (29) being fixedly connected to the second eccentric shaft (28), the fourth servo motor (29) being electrically connected to a controller (14), and the controller (14) being used to control the operation of the fourth servo motor (29).

2. The feeding mechanism for polishing the surface of injection molded parts according to claim 1, characterized in that: A push rod (15) passes through the trough body (9), one end of the push rod (15) extends into the trough body (9) and penetrates into the receiving groove (8), an annular piece (16) is sleeved and fixedly mounted on the push rod (15), and a spring (17) is provided on the outer sleeve of the push rod (15), and two ends of the spring (17) are fixedly connected to the receiving groove (8) and the annular piece (16) respectively.

3. The feeding mechanism for polishing the surface of injection molded parts according to claim 2, characterized in that: The second servo motor (20) is electrically connected to a controller (14), and the controller (14) is used to control the operation of the second servo motor (20).

4. The feeding mechanism for polishing the surface of injection molded parts according to claim 3, characterized in that: The electric telescopic rod (25) is electrically connected to the controller (14), and the controller (14) is used to control the operation of the electric telescopic rod (25). The third servo motor (26) is electrically connected to the controller (14), and the controller (14) is used to control the operation of the third servo motor (26).

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