Abrasive particle flow polishing equipment for metal part stepped hole deburring

Abstract

The utility model discloses abrasive flow polishing equipment for deburring a stepped hole of a metal part, and relates to the technical field of polishing equipment. The device comprises a shell. The polishing assembly is started to push grinding materials to flow upwards from a hole formed in a workpiece, the inner wall of the hole in the workpiece is polished, the driving assembly is started to drive the transmission assembly fixedly installed at the output end of the driving assembly to rotate, the transmission assembly can drive the lifting assembly to rotate, and when the lifting assembly rotates, the grinding materials are driven to rotate. By means of the lifting device, grinding materials in the polishing assembly can be lifted, so that the grinding materials enter the circulating assembly, by starting the circulating assembly to make reciprocating motion, the grinding materials in the polishing assembly can be extracted, and meanwhile the grinding materials entering the circulating assembly can be pushed into the polishing assembly again; and therefore, manual recovery of the grinding materials and subsequent workpiece machining are avoided, and the workpiece machining efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of polishing equipment, specifically, especially relates to a kind of abrasive flow polishing equipment for deburring of metal component step hole. BACKGROUND

[0002] Abrasive flow equipment adopts macromolecular soft abrasive, by the way of extrusion grinding, soft abrasive is extruded into workpiece inner hole or surface to be processed, repeatedly grinds, to achieve the purpose of polishing and deburring.It has the characteristics of high efficiency, environmental protection and precision, and can solve various complex polishing and deburring problems.

[0003] When workpiece is processed by abrasive flow equipment, generally, workpiece is extruded by hydraulic cylinder driving upper rack, then extrusion device extrudes abrasive, and makes it pass through hole on workpiece, to polish hole on workpiece.In prior art, after polishing hole on workpiece, abrasive passing through workpiece is stored in the inside of upper rack, when hydraulic cylinder drives upper rack to move upward, abrasive in the inside of upper rack is likely to fall on workpiece surface, and it needs to be manually recycled, which is likely to affect subsequent workpiece processing, and thus reduce the polishing efficiency of workpiece.

[0004] For the problems in the related art, there is no effective solution at present. UTILITY MODEL CONTENTS

[0005] For the problems in the related art, the utility model provides a kind of abrasive flow polishing equipment for deburring of metal component step hole to overcome the above technical problems existing in prior art.

[0006] To solve the above technical problems, the utility model is realized by the following technical scheme:

[0007] The utility model is a kind of abrasive flow polishing equipment for deburring of metal component step hole, including shell:

[0008] The polishing assembly, drive assembly, transmission assembly, lifting assembly and circulation assembly are respectively arranged on the shell.

[0009] The polishing assembly is fixedly installed on the outer surface of the shell, to polish and process workpiece by the polishing assembly.

[0010] The output end of the drive assembly is fixedly installed in the transmission assembly, to drive the transmission assembly to operate by the drive assembly.

[0011] The outer surface of the lifting assembly is fixedly installed in the transmission assembly, to drive the lifting assembly to lift abrasive when the transmission assembly operates.

[0012] The circulating assembly is internally communicated with the interior of the polishing assembly, so that the lifting assembly pushes the abrasive into the interior of the circulating assembly and circulates.

[0013] Further, the polishing assembly comprises a support table and a hydraulic cylinder, the outer surface of the support table is fixedly installed with the interior of the shell, and the bottom end of the support table is provided with an abrasive pushing device.

[0014] The top end of the hydraulic cylinder is fixedly installed with the inner wall of the shell, the telescopic end of the hydraulic cylinder is fixedly installed with an upper rack, the interior of the upper rack is rotatably provided with the outer surface of the lifting assembly, and the interior of the upper rack is in communication with the interior of the circulating assembly.

[0015] Further, the driving assembly comprises a mounting rack, the top end of the mounting rack is fixedly installed with the inner wall of the shell, and the bottom end of the mounting rack is fixedly installed with a motor, and the output end of the motor is fixedly installed with the interior of the transmission assembly.

[0016] Further, the transmission assembly comprises a main transmission wheel, the interior of the main transmission wheel is fixedly installed with the output end of the motor, the inner side of the main transmission wheel is drivingly provided with a transmission belt, the inner side of the transmission belt is drivingly provided with a secondary transmission wheel, and the interior of the secondary transmission wheel is fixedly installed with the outer surface of the lifting assembly.

[0017] Further, the lifting assembly comprises a rotating rod, the outer surface of the rotating rod is rotatably provided with the interior of the shell, the outer surface of the rotating rod is fixedly installed with the interior of the secondary transmission wheel, and the bottom end of the rotating rod is fixedly installed with a telescopic rod.

[0018] The outer surface of the telescopic rod is rotatably provided with a rotating seat, the bottom end of the rotating seat is fixedly installed with the top end of the upper rack, the outer surface of the telescopic rod is fixedly connected with a spiral conveying blade, and the outer surface of the spiral conveying blade is in abutment with the inner wall of the upper rack.

[0019] Further, the circulating assembly comprises a circulating box, the bottom end of the circulating box is fixedly installed with the interior of the shell, the top end of the circulating box is fixedly connected with a connecting pipe, the interior of the connecting pipe is in communication with the interior of the upper rack, the interior of the circulating box is interference-provided with a piston, and one side of the piston is fixedly installed with an electric push rod.

[0020] The bottom end of the circulating box is provided with a connecting groove, and the interior of the connecting groove is in communication with the interior of the abrasive pushing device.

[0021] Further, the circulating assembly further comprises a limiting frame, one side of the limiting frame is abuttedly provided with a baffle, one side of the baffle is fixedly connected with a sliding rod, the outer side of the sliding rod is provided with a spring, and one end of the spring is fixedly connected with one side of the baffle.

[0022] The utility model has the following beneficial effects:

[0023] 1, the utility model discloses a start polishing subassembly and promote the abrasive that the hole that is set up from workpiece flows upwards to the inner wall of the hole on workpiece and carry out polishing, drive its output fixed mounting transmission assembly and rotate through starting drive component, when transmission assembly rotates, can drive its inside fixed mounting lifting assembly and rotate, lifting assembly rotates, can promote the abrasive in the polishing subassembly, to make it enter the inside of circulating assembly, make it reciprocating motion through starting circulating assembly, can extract the abrasive in the polishing subassembly, simultaneously can promote the abrasive in the inside of circulating assembly again to the inside of polishing subassembly, convenient for its circulation to abrasive, and then avoid manual recovery and subsequent workpiece processing to abrasive, improve the processing efficiency of workpiece.

[0024] 2, the utility model discloses a start electric push rod and drive its telescopic end fixed mounting piston and move, can promote the abrasive and move, and make it promote the baffle and move, when the baffle moves, can drive its one side fixed connection sliding rod and move, simultaneously can compress the spring of its one side fixed connection, and then convenient for abrasive to enter the inside of connecting groove, when electric push rod drives piston and recovers, under the action of spring, can promote the one side of baffle and the one side of limiting frame and fit, and then convenient for the closing of connecting groove, so that it can extract the abrasive in the inside of upper rack through connecting pipe, thereby favoring the circulation of abrasive.

[0025] Of course, implementing any product of the utility model does not necessarily need to achieve all the advantages mentioned above at the same time. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will introduce the drawings needed to be used in the embodiment description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0027] Figure 1 It is the three-dimensional structure schematic diagram of the utility model;

[0028] Figure 2 It is the inside structure schematic diagram of the shell of the utility model;

[0029] Figure 3 It is the cross section structure schematic diagram under the right view angle of the utility model;

[0030] Figure 4 It is the cross section structure schematic diagram under the rear view angle of the utility model;

[0031] Figure 5 The utility model discloses a polishing assembly Figure 4 The enlarged schematic view of the partial structure at A in the middle;

[0032] Figure 6 The utility model discloses a polishing assembly internal structure schematic view;

[0033] Figure 7 The utility model discloses a polishing assembly Figure 6 The enlarged schematic view of the partial structure at B in the middle.

[0034] In the drawings, the component list represented by each sign is as follows:

[0035] 1, shell;2, polishing assembly;201, support platform;202, hydraulic cylinder;203, abrasive pushing device;204, upper rack;3, drive assembly;301, mounting frame;302, motor;4, transmission assembly;401, main transmission wheel;402, transmission belt;403, auxiliary transmission wheel;5, lifting assembly;501, rotating rod;502, telescopic rod;503, rotating seat;504, spiral conveying blade;6, circulating assembly;601, circulating box;602, connecting pipe;603, piston;604, electric push rod;605, connecting groove;606, limiting frame;607, baffle;608, sliding rod;609, spring. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model protection.

[0037] In the description of the utility model, it is understood that the terms "opening", "upper", "lower", "top", "middle", "inner" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated components or elements must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.

[0038] Please refer to Figures 1-7 The utility model discloses a kind of abrasive flow polishing equipment for metal parts step hole deburring, including shell 1:

[0039] The shell 1 is separately provided with polishing assembly 2, drive assembly 3, transmission assembly 4, lifting assembly 5, circulating assembly 6;

[0040] The polishing assembly 2 is fixedly installed with the outer surface of the polishing assembly 2 and the inside of the shell 1, so that the polishing assembly 2 polishes the workpiece;

[0041] The driving assembly 3 is fixedly installed with the output end of the driving assembly 3 and the inside of the transmission assembly 4, so that the driving assembly 3 drives the transmission assembly 4 to operate;

[0042] The lifting assembly 5 is fixedly installed with the outer surface of the lifting assembly 5 and the inside of the transmission assembly 4, so that the transmission assembly 4 drives the lifting assembly 5 to lift the abrasive when the transmission assembly 4 operates;

[0043] The circulation assembly 6 is connected with the inside of the polishing assembly 2, so that the lifting assembly 5 pushes the abrasive into the inside of the circulation assembly 6 and circulates.

[0044] In use, the workpiece is placed on the top end of the polishing assembly 2, and then the polishing assembly 2 is started to extrude and clamp the workpiece, and the abrasive is pushed to flow upward from the hole on the workpiece, so that the abrasive polishes the inner wall of the hole on the workpiece. Since the polished abrasive enters the inside of the top end of the polishing assembly 2, the driving assembly 3 is started to drive the transmission assembly 4 fixedly installed at the output end of the driving assembly 3 to rotate, and the transmission assembly 4 rotates to drive the lifting assembly 5 fixedly installed in the inside of the transmission assembly 4 to rotate. Since the outer surface of the lifting assembly 5 is attached to the inner wall of the polishing assembly 2, when the lifting assembly 5 rotates, the abrasive in the inside of the lifting assembly 5 is lifted to enter the inside of the circulation assembly 6 connected with the inside of the polishing assembly 2. The circulation assembly 6 is started to reciprocate to extract the abrasive in the inside of the polishing assembly 2, and the abrasive in the inside of the circulation assembly 6 is pushed again into the inside of the polishing assembly 2, so that the abrasive is circulated conveniently.

[0045] The abrasive is pushed by the polishing assembly 2 to flow upward from the hole on the workpiece to polish the inner wall of the hole on the workpiece, the driving assembly 3 is started to drive the transmission assembly 4 fixedly installed at the output end of the driving assembly 3 to rotate, the transmission assembly 4 rotates to drive the lifting assembly 5 fixedly installed in the inside of the transmission assembly 4 to rotate, the lifting assembly 5 rotates to lift the abrasive in the inside of the polishing assembly 2 to enter the inside of the circulation assembly 6, the circulation assembly 6 is started to reciprocate to extract the abrasive in the inside of the polishing assembly 2, and the abrasive in the inside of the circulation assembly 6 is pushed again into the inside of the polishing assembly 2, so that the abrasive is circulated conveniently.

[0046] In one embodiment, for the above polishing assembly 2, the polishing assembly 2 comprises a support table 201 and a hydraulic cylinder 202, the outer surface of the support table 201 is fixedly installed with the inside of the shell 1, and the bottom end of the support table 201 is provided with an abrasive pushing device 203;

[0047] The top end of the hydraulic cylinder 202 is fixedly installed with the inner wall of the shell 1, the telescopic end of the hydraulic cylinder 202 is fixedly installed with an upper rack 204, the inside of the upper rack 204 is rotatably provided with the outer surface of the lifting assembly 5, and the inside of the upper rack 204 is in communication with the inside of the circulating assembly 6.

[0048] By placing the workpiece on the top end of the support table 201, then starting the hydraulic cylinder 202 to drive the telescopic end of the upper rack 204 to move downward to extrude and fix the top end of the workpiece, then starting the abrasive pushing device 203 to push the abrasive through the support table 201 into the inside of the hole of the workpiece, so that the inside of the hole is polished, and since the upper rack 204 is arranged at the top end of the workpiece, the abrasive passing through the workpiece can enter the inside of the upper rack 204, thereby facilitating the recycling of the abrasive by the lifting assembly 5, which is more convenient.

[0049] In one embodiment, for the above driving assembly 3, the driving assembly 3 comprises a mounting frame 301, the top end of the mounting frame 301 is fixedly installed with the inner wall of the shell 1, the bottom end of the mounting frame 301 is fixedly installed with a motor 302, and the output end of the motor 302 is fixedly installed with the inside of the transmission assembly 4.

[0050] By starting the motor 302 to drive the output end of the transmission assembly 4 to rotate, the transmission assembly 4 is provided with stable power.

[0051] In one embodiment, for the above transmission assembly 4, the transmission assembly 4 comprises a main transmission wheel 401, the inside of the main transmission wheel 401 is fixedly installed with the output end of the motor 302, the inner side of the main transmission wheel 401 is drivingly provided with a transmission belt 402, the inner side of the transmission belt 402 is drivingly provided with a secondary transmission wheel 403, and the inside of the secondary transmission wheel 403 is fixedly installed with the outer surface of the lifting assembly 5.

[0052] By starting the motor 302 to drive the output end of the main transmission wheel 401 to rotate, since the main transmission wheel 401 and the secondary transmission wheel 403 are drivingly connected through the transmission belt 402, when the main transmission wheel 401 rotates, it can drive the secondary transmission wheel 403 to rotate through the transmission belt 402, and when the secondary transmission wheel 403 rotates, it can drive the lifting assembly 5 fixedly installed in the inside of the secondary transmission wheel 403 to rotate, so that the abrasive in the inside of the upper rack 204 can be lifted, which is more convenient.

[0053] In one embodiment, for the above lifting assembly 5, the lifting assembly 5 comprises a rotating rod 501, the outer surface of the rotating rod 501 is rotatably arranged in the inside of the shell 1, the outer surface of the rotating rod 501 is fixedly installed with the inside of the secondary transmission wheel 403, the bottom end of the rotating rod 501 is fixedly installed with the telescopic rod 502;

[0054] The outer surface of the telescopic rod 502 is rotatably arranged with a rotating seat 503, the bottom end of the rotating seat 503 is fixedly installed with the top end of the upper rack 204, the outer surface of the telescopic rod 502 is fixedly connected with the spiral conveying blade 504, the outer surface of the spiral conveying blade 504 is in close contact with the inner wall of the upper rack 204.

[0055] When the secondary transmission wheel 403 rotates, it can drive the rotating rod 501 fixedly installed in the inside to rotate, the rotating rod 501 rotates, which can drive the telescopic rod 502 fixedly installed at the bottom end to rotate, the telescopic rod 502 rotates, which can drive the spiral conveying blade 504 fixedly connected with the outer surface to rotate, so that it rotates along the inner wall of the upper rack 204, which can drive the abrasive entering the inside of the upper rack 204 to rise, facilitating the collection of the abrasive.

[0056] In one embodiment, for the above circulating assembly 6, the circulating assembly 6 comprises a circulating box 601, the bottom end of the circulating box 601 is fixedly installed with the inside of the shell 1, the top end of the circulating box 601 is fixedly connected with a connecting pipe 602, the inside of the connecting pipe 602 is communicated with the inside of the upper rack 204, the inside of the circulating box 601 is interference arranged with a piston 603, one side of the piston 603 is fixedly installed with an electric push rod 604;

[0057] The bottom end of the circulating box 601 is provided with a connecting groove 605, the inside of the connecting groove 605 is communicated with the inside of the abrasive pushing device 203.

[0058] When the abrasive rises by the rotation of the spiral conveying blade 504, it can enter the inside of the connecting pipe 602 and the inside of the circulating box 601, the electric push rod 604 is started to drive the piston 603 fixedly installed at the telescopic end to move, which can further drive the abrasive in the circulating box 601 to enter the inside of the connecting groove 605, since the inside of the connecting groove 605 is communicated with the inside of the abrasive pushing device 203, the abrasive in the connecting groove 605 can enter the inside of the abrasive pushing device 203, which can form a circulation of the abrasive, improving the practicability of the abrasive flow polishing equipment for deburring the stepped hole of the metal part.

[0059] In one embodiment, for the above-mentioned circulating assembly 6, the circulating assembly 6 further comprises a limiting frame 606, one side of the limiting frame 606 is provided with a baffle plate 607, one side of the baffle plate 607 is fixedly connected with a sliding rod 608, the outer side of the sliding rod 608 is provided with a spring 609, one end of the spring 609 is fixedly connected with one side of the baffle plate 607.

[0060] By starting the electric push rod 604 to drive the piston 603 fixedly installed at the telescopic end to move, the abrasive can be pushed to move, and the baffle plate 607 is pushed to move, when the baffle plate 607 moves, the sliding rod 608 fixedly connected with one side of the baffle plate 607 can be moved, and the spring 609 fixedly connected with one side of the baffle plate 607 can be compressed, so that the abrasive enters the inside of the connecting groove 605, when the electric push rod 604 drives the piston 603 to be recycled, under the action of the spring 609, one side of the baffle plate 607 can be attached to one side of the limiting frame 606, so that the connecting groove 605 is closed, so that the abrasive in the upper rack 204 can be extracted through the connecting pipe 602, thereby facilitating the circulation of the abrasive.

[0061] Through the above technical solution, 1, by starting the polishing assembly 2 to push the abrasive to flow upward from the hole opened on the workpiece, the inner wall of the hole on the workpiece is polished, by starting the driving assembly 3 to drive the transmission assembly 4 fixedly installed at the output end to rotate, when the transmission assembly 4 rotates, the lifting assembly 5 fixedly installed in the transmission assembly 4 can be driven to rotate, when the lifting assembly 5 rotates, the abrasive in the polishing assembly 2 can be lifted, so that it enters the inside of the circulating assembly 6, by starting the circulating assembly 6, the abrasive in the polishing assembly 2 can be extracted, and the abrasive entering the inside of the circulating assembly 6 can be pushed into the inside of the polishing assembly 2 again, so as to facilitate the circulation of the abrasive, thereby avoiding manual recycling of the abrasive and subsequent workpiece processing, and improving the workpiece processing efficiency;

[0062] 2, by starting the electric push rod 604 to drive the piston 603 fixedly installed at the telescopic end to move, the abrasive can be pushed to move, and the baffle plate 607 is pushed to move, when the baffle plate 607 moves, the sliding rod 608 fixedly connected with one side of the baffle plate 607 can be moved, and the spring 609 fixedly connected with one side of the baffle plate 607 can be compressed, so that the abrasive enters the inside of the connecting groove 605, when the electric push rod 604 drives the piston 603 to be recycled, under the action of the spring 609, one side of the baffle plate 607 can be attached to one side of the limiting frame 606, so that the connecting groove 605 is closed, so that the abrasive in the upper rack 204 can be extracted through the connecting pipe 602, thereby facilitating the circulation of the abrasive.

[0063] In the description of the application, references to "one embodiment", "an example", "certain examples" etc. mean that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "an example" or "certain examples" in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0064] The preferred embodiments of the application disclosed above are only used to help explain the application. The preferred embodiments do not describe all of the details of the application, nor limit the application to the specific embodiments described. Obviously, many modifications and variations of the application can be made in light of the teachings above. The embodiments are chosen and described in order to best explain the principles of the application and its practical application, to thereby enable others skilled in the art to best utilize the application. The application is merely exemplary and limited by the scope of the appended claims as well as the equivalents thereof.

Claims

1. A kind of abrasive flow polishing equipment for metal component step hole deburring, comprising shell (1), characterized by: The polishing assembly (2) is fixedly installed on the outer surface of the shell (1) inside, so that the polishing assembly (2) is polished to workpiece; The drive assembly (3) is fixedly installed at the output end of the transmission assembly (4) inside, so that the drive assembly (3) drives the transmission assembly (4) to run; The lifting assembly (5) is fixedly installed on the outer surface of the transmission assembly (4) inside, so that the transmission assembly (4) drives the lifting assembly (5) to lift the abrasive when running; The circulation assembly (6) is communicated with the inside of the polishing assembly (2), so that the lifting assembly (5) pushes the abrasive into the inside of the circulation assembly (6) and circulates. The polishing assembly (2) includes support table (201) and hydraulic cylinder (202), the outer surface of the support table (201) is fixedly installed in the shell (1), and the bottom end of the support table (201) is provided with abrasive pushing device (203); The top end of the hydraulic cylinder (202) is fixedly installed with the inner wall of the shell (1), and the telescopic end of the hydraulic cylinder (202) is fixedly installed with upper rack (204), the inside of the upper rack (204) is rotatably arranged with the outer surface of the lifting assembly (5), and the inside of the upper rack (204) is communicated with the inside of the circulation assembly (6). The drive assembly (3) includes mounting bracket (301), the top end of the mounting bracket (301) is fixedly installed with the inner wall of the shell (1), and the bottom end of the mounting bracket (301) is fixedly installed with motor (302), and the output end of the motor (302) is fixedly installed with the inside of the transmission assembly (4). The transmission assembly (4) includes main transmission wheel (401), the inside of the main transmission wheel (401) is fixedly installed with the output end of the motor (302), the inner side of the main transmission wheel (401) is drivenly provided with transmission belt (402), the inner side of the transmission belt (402) is drivenly provided with auxiliary transmission wheel (403), and the inside of the auxiliary transmission wheel (403) is fixedly installed with the outer surface of the lifting assembly (5). The lifting assembly (5) includes rotating rod (501), the outer surface of the rotating rod (501) is rotatably arranged with the inside of the shell (1), the outer surface of the rotating rod (501) is fixedly installed with the inside of the auxiliary transmission wheel (403), and the bottom end of the rotating rod (501) is fixedly installed with telescopic rod (502); The outer surface of the telescopic rod (502) is rotatably provided with rotating seat (503), the bottom end of the rotating seat (503) is fixedly installed with the top end of the upper rack (204), the outer surface of the telescopic rod (502) is fixedly connected with spiral conveying blade (504), and the outer surface of the spiral conveying blade (504) is matched with the inner wall of the upper rack (204).

2. The apparatus for deburring a stepped hole of a metal part according to claim 1, wherein ​ ​ 3. The apparatus for deburring a stepped hole of a metal part according to claim 2, wherein ​ 4. The apparatus for burring of stepped holes of metal parts according to claim 3, wherein ​ 5. An apparatus for abrasive flow deburring of stepped holes in metal parts according to claim 4, wherein, ​ ​ 6. An apparatus for burr removal from a stepped hole of a metal part according to claim 2, wherein The circulating assembly (6) comprises a circulating box (601), the bottom end of the circulating box (601) is fixedly installed with the inside of the shell (1), the top end of the circulating box (601) is fixedly connected with a connecting pipe (602), the inside of the connecting pipe (602) is communicated with the inside of the upper rack (204), the inside of the circulating box (601) is provided with a piston (603) in interference, one side of the piston (603) is fixedly installed with an electric push rod (604); The bottom end of the circulating box (601) is provided with a connecting groove (605), and the inside of the connecting groove (605) is communicated with the inside of the abrasive pushing device (203).

7. An apparatus for abrasive flow deburring of stepped holes in metal parts according to claim 6 wherein, The circulating assembly (6) further comprises a limiting frame (606), one side of the limiting frame (606) is attached with a baffle (607), one side of the baffle (607) is fixedly connected with a sliding rod (608), the outer side of the sliding rod (608) is provided with a spring (609), and one end of the spring (609) is fixedly connected with one side of the baffle (607).

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