CN212495595U - Milling chamfer production line of piston for refrigerator compressor - Google Patents

Abstract

The utility model provides a milling chamfer production line of piston that refrigerator compressor was used belongs to machining equipment technical field. The automatic chamfering machine comprises a plurality of piston workpieces, a rack, and a feeding mechanism, a positioning mechanism, a chamfering milling mechanism and a discharging mechanism which are sequentially arranged on the rack, wherein the feeding mechanism comprises a sorting device and a feeding conveying groove, the sorting device comprises a rotary drum which is rotatably connected to the rack and a sorting material-conveying channel which is fixed on the rack, and the discharging end of the sorting material-conveying channel is connected with the feeding conveying groove; the blanking mechanism comprises a blanking conveying groove and a discharging device; the chamfering milling mechanism comprises two chamfering milling manipulators which are respectively opposite to the two positioning devices, and the chamfering milling manipulators can carry chamfering milling cutters to mill chamfers on the piston workpieces on the corresponding positioning devices. The utility model has the advantages of can mill chamfer processing etc. automatically to the work piece.

Description

Milling chamfer production line of piston for refrigerator compressor

Technical Field

The utility model belongs to the technical field of machining equipment, a milling chamfer production line of piston that refrigerator compressor used is related to.

Background

The piston of the compressor on the refrigerator comprises a columnar body, wherein one end of the columnar body is provided with a strip-shaped mounting hole, the columnar body is provided with a pin hole penetrating through the strip-shaped mounting hole, the axis of the pin hole is vertical to the length direction of the strip-shaped mounting hole, and in order to enable the outer end of a pin shaft to be positioned in the outer peripheral surface of the piston, a chamfer surface is milled on the outer peripheral surface of the columnar body provided with the pin hole, so that the position is formed on the outer peripheral surface of the columnar body to form a concave part for avoiding the outer end of the pin shaft or avoiding a clamp spring for fixing; the chamfer surface is positioned at the cutting groove.

Because the piston size that compressor was used on the refrigerator is less, there are difficult problems such as location, pan feeding, ejection of compact in the processing of accurate milling chamfer on the basis of foundry goods blank.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the above-mentioned problem that exists to current technique, provide a chamfer production line is milled to piston that refrigerator compressor was used, the utility model aims to solve the technical problem that how realize the automation of piston work piece and mill the chamfer.

The purpose of the utility model can be realized by the following technical proposal: a milling chamfer production line of a piston for a refrigerator compressor is characterized by comprising a plurality of piston workpieces, a rack, a feeding mechanism, a positioning mechanism, a milling chamfer mechanism and a discharging mechanism which are sequentially arranged on the rack, wherein the feeding mechanism comprises a sorting device and a feeding conveying groove, the sorting device comprises a rotary drum which is rotatably connected to the rack and a sorting material-conveying channel which is fixed on the rack, and the discharging end of the sorting material-conveying channel is connected with the feeding conveying groove; the blanking mechanism comprises a blanking conveying groove and a discharging device; the positioning mechanism comprises two positioning devices and two workpiece taking manipulators, wherein one positioning device is close to the feeding conveying groove, the other positioning device is close to the discharging conveying groove, the chamfering milling mechanism comprises two chamfering milling manipulators respectively corresponding to the two positioning devices, the chamfering milling manipulators can carry a milling cutter to mill and chamfer piston workpieces on the corresponding positioning devices, and one workpiece taking manipulator can grab the piston workpieces on the feeding conveying groove onto the positioning devices close to the feeding conveying groove one by one; and the other part taking manipulator can grab the piston workpiece close to the feeding conveying groove to the positioning device close to the discharging conveying groove, and grab the piston workpiece to the discharging conveying groove after the milling and chamfering are finished.

After the piston workpieces are selected, the piston workpieces enter the feeding conveying groove in the same position state, then the piston workpieces are respectively placed on the two positioning devices through the workpiece taking manipulator, when each positioning device is located, the milling chamfering machining of one chamfering surface of each piston workpiece is completed through the chamfering milling manipulator, after the two chamfering surfaces are milled, the workpiece after the chamfering is completed through the workpiece taking manipulator is grabbed into the discharging conveying groove, and then the workpiece is output through the discharging mechanism.

Furthermore, the sorting material feeding channel is arranged on a sorting block, the sorting block is positioned in the rotary drum, the sorting material feeding channel is arranged between two parallel blocking bars on the sorting block, the inlet of the sorting material feeding channel is close to the bottom surface of the rotary drum, two material guide plates with inclination angles are arranged at the inlet of the sorting material feeding channel and fixed on the sorting block, a first sorting bar is connected between the two material guide plates, one end of the first sorting bar is fixed at the outer end of one of the material guide plates, the other end of the first sorting bar is fixed at the middle part of the other material guide plate, a first sorting groove allowing only a piston workpiece at the bottom of the peripheral rotary drum to pass through is formed between the first sorting bar and the bottom of the rotary drum, a notch is formed on one of the blocking bars in the middle part of the sorting material feeding groove, and a plurality of second sorting bars positioned at the notch are arranged at the bottom of the sorting material feeding groove, the bottom of each second sorting rod and the sorting material feeding groove are in smooth transition, the free end of each second sorting rod faces to the notch, the length of each second sorting rod is smaller than the width of the sorting material feeding groove, the feeding conveying groove is connected with the notch, a guide inclined plane is arranged between the notch and the feeding sorting groove, and the tail end of the sorting material feeding channel is communicated with the inner cavity of the rotary drum.

Furthermore, the middle part of the sorting and feeding channel is higher than the two ends.

Furthermore, the feeding conveying groove is communicated with the notch through a feeding bridge, a sliding groove allowing the piston workpiece to pass through is formed in the feeding bridge, a limiting piece limiting the piston workpiece to be separated from the sliding groove is arranged at an opening of the sliding groove, the feeding bridge is spiral, and the piston workpiece on the opening is overturned by the feeding bridge and then conveyed into the feeding conveying groove.

The rotary drum rotates, particularly under the condition of material guiding, the piston workpiece can enter the sorting material-conveying channel, the piston workpiece vertically arranged in the rotary drum can not enter the sorting material-conveying groove under the action of a first sorting bar, because the height of the piston workpiece is larger than the diameter, the piston workpiece which is only in a rolling state in the rotary drum can enter the sorting material-conveying groove, under the stirring action of a sorting block on the piston workpiece in the rotary drum, the piston workpiece can turn or roll under the stirring action, so that the piston workpiece which is temporarily not capable of entering the sorting material-conveying channel can have the opportunity to re-enter, the piston workpiece which rolls into the sorting material-conveying channel runs to the notch along the sorting material-conveying channel, because one end of the piston workpiece is open, the piston workpiece with the opening back to the notch is inclined due to the light weight of the open end and the heavy weight of the open end, and slides to the material-conveying bridge through the guide inclined plane after being inclined, piston workpieces which cannot be toppled are pushed one by one in the inlet direction and fall into the rotary drum again from the tail end, the piston workpieces entering the material passing bridge are upwards opened, and the workpieces with the upwards opened openings are overturned under the action of the spiral material passing bridge, so that the openings downwards enter the feeding conveying groove.

Further, positioner is including fixing the installation piece in the frame, set up on the installation piece with the bar mounting hole department on the piston work piece on the guiding hole on same straight line, still vertically be provided with on the installation piece with the guiding hole vertically dodge the hole, it is equipped with the locating lever that two symmetries set up to dodge downthehole interpolation, the locating lever includes sliding connection at the downthehole location portion of dodging of guiding part and sliding connection, location portion stretches out on dodging the hole, be connected with one between the outer end of guiding part and the pore wall of guiding hole and order about the locating lever to the reed that the guiding hole middle part removed, the lower extreme of guiding part has a wedge type's location inclined plane, the bottom surface at the middle part of guiding hole is provided with the lug with location inclined plane adaptation.

Furthermore, a compression structure in one-to-one correspondence with the positioning devices is arranged on the rack, the compression structure comprises a pressure arm hinged on the rack, one end of the pressure arm is connected with a hydraulic cylinder, the middle part of the pressure arm is hinged on the rack, and the other end of the pressure arm is provided with a compression block capable of extruding a piston workpiece positioned on the positioning rod.

The piston workpiece is under the effect of a workpiece taking manipulator, the workpiece can be located on the positioning rods, in an initial state, the two positioning rods are close to each other under the effect of the reed, the overall dimension of the two positioning rods is smaller than the width of the strip-shaped mounting hole of the piston workpiece, the strip-shaped mounting hole of the piston workpiece can be freely sleeved on the two positioning rods, the pressing mechanism presses the end face of the piston rod piece downwards, the piston rod piece moves downwards, meanwhile, the positioning inclined plane at the lower end of the guide part moves towards the outer side of the guide hole under the effect of the lug, the distance between the two positioning rods is enlarged, the piston rod piece can be adjusted to be in a state that the length direction of the strip-shaped mounting hole is consistent with the opening direction of the two positioning rods, and the purpose of positioning before the chamfering is conducted on the piston workpiece.

Furthermore, the discharging device comprises a turntable which is rotationally connected on the frame, the tail end of the blanking conveying groove is positioned above the turntable, a shifting plate fixed on the frame is arranged above the turntable, one end of the shifting plate along the rotation direction of the turntable is close to the center of the turntable, a discharge hole is arranged at the central position of the rotary disc and penetrates through the upper surface and the lower surface of the rotary disc, a discharging channel which is in smooth transition with the upper surface of the rotary table is arranged at the discharging opening, the inlet of the discharging channel is provided with a guide part with larger width, the tail end of the discharging channel is positioned below the turntable, a material receiving disc is fixedly arranged on the frame, the material receiving disc is connected with a plurality of groups of material guiding assemblies, each material guiding assembly comprises two guide bars, the gap and the height between the two guide bars are matched with the cutting grooves in the piston workpiece, and the guide bars gradually decline from the head end to the tail end.

The piston workpiece is guided and prevented from falling off by the supporting strips, the piston workpiece is stacked and pushed in the material receiving disc, so that the piston workpiece can slide away from the material receiving disc along the two supporting strips, and the tail ends of the two supporting strips are provided with packaging containers, so that the piston workpiece can enter the packaging containers orderly.

The function of the shifting plate is as follows: prevent on the one hand that the piston work piece from piling up in the exit of unloading conveyer trough, on the other hand orders about the piston work piece and removes to the middle part of carousel to in making the piston work piece can get into the discharging channel of discharge gate department, the piston work piece drops into the take-up (stock) pan through discharging channel, the take-up (stock) pan is fixed in the frame, makes in the piston work piece gets into static take-up (stock) pan, and send into in the packaging container under the effect of guide subassembly.

Drawings

FIG. 1 is a schematic view of the production line

Fig. 2 is a schematic perspective view of fig. 1 with the peripheral plate of the frame and the sorting device removed.

Fig. 3 is a schematic perspective view of a piston workpiece.

Fig. 4 is a schematic structural view of the positioning device before the piston workpiece is pressed.

Fig. 5 is a schematic structural diagram of the positioning device after the piston workpiece is pressed.

Fig. 6 is a schematic perspective view of the screening device.

Fig. 7 is a schematic perspective view of the sorting block.

Fig. 8 is a perspective view of the turntable.

Fig. 9 is an enlarged view of a portion a in fig. 2.

Fig. 10 is a schematic plan view of a bar transfer piston workpiece.

In the figure, 1, a piston workpiece; 11. a strip-shaped mounting hole; 12. cutting a groove; 13. chamfering; 2. a frame; 21. a feeding conveying groove; 22. a rotating drum; 23. sorting a material conveying channel; 24. A blanking conveying trough; 25. a pick-up manipulator; 26. milling a chamfering manipulator; 31. selecting blocks; 32. blocking strips; 33. a material guide plate; 34. a first sorting bar; 35. a notch; 36. a second sorting bar; 37. a material feeding bridge; 41. mounting blocks; 42. a guide hole; 43. avoiding holes; 44. a positioning part; 45. a guide portion; 46. a reed; 47. positioning the inclined plane; 48. a bump; 49. pressing the arm; 51. a turntable; 52. dialing a plate; 53. a discharge channel; 54. a take-up pan; 55. and (7) conducting strips.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in fig. 1, fig. 2, fig. 3 and fig. 9, the piston workpiece sorting device comprises a plurality of piston workpieces 1, a frame 2, and a feeding mechanism, a positioning mechanism, a chamfering mechanism and a discharging mechanism which are sequentially arranged on the frame 2, wherein the feeding mechanism comprises a sorting device and a feeding conveying groove 21, the sorting device comprises a rotary drum 22 which is rotatably connected to the frame 2 and a sorting material-feeding channel 23 which is fixed on the frame 2, and the discharging end of the sorting material-feeding channel 23 is connected with the feeding conveying groove 21; the blanking mechanism comprises a blanking conveying groove 24 and a discharging device; the positioning mechanism comprises two positioning devices and two workpiece taking manipulators 25, one positioning device is close to the feeding conveying groove 21, the other positioning device is close to the discharging conveying groove 24, the chamfering and milling mechanism comprises two chamfering and milling manipulators 26 respectively corresponding to the two positioning devices, the chamfering and milling manipulators 26 can carry a milling cutter to mill and chamfer the piston workpieces 1 on the corresponding positioning devices, and one workpiece taking manipulator 25 can grab the piston workpieces 1 on the feeding conveying groove 21 one by one onto the positioning devices close to the feeding conveying groove 21; the other part taking manipulator 25 can grab the piston workpiece 1 close to the feeding conveying groove 21 to the positioning device close to the discharging conveying groove 24, and grab the piston workpiece 1 to the discharging conveying groove 24 after the chamfering is finished.

After the piston workpieces 1 are selected, the piston workpieces enter the feeding conveying groove 21 in the same position state, then the piston workpieces are respectively placed on the two positioning devices through the workpiece taking manipulator 25, when each positioning device is located, the milling chamfering machining of one chamfering surface 13 of each piston workpiece 1 is completed through the chamfering milling manipulator 26, after the two chamfering surfaces 13 are milled and chamfered, the workpiece which is milled and chamfered is grabbed into the discharging conveying groove 24 through the workpiece taking manipulator 25, and then the workpiece is output through the discharging mechanism.

As shown in fig. 2, 6 and 7, the sorting material channel 23 is disposed on a sorting block 31, the sorting block 31 is located in the rotary drum 22, the sorting material channel 23 is a space between two parallel blocking strips 32 disposed on the sorting block 31, an inlet of the sorting material channel 23 is close to the bottom surface of the rotary drum 22, two inclined guide plates 33 are disposed at the inlet of the sorting material channel 23, the guide plates 33 are fixed on the sorting block 31, a first sorting strip 34 is connected between the two guide plates 33, one end of the first sorting strip 34 is fixed at an outer end of one of the guide plates 33, the other end of the first sorting strip 34 is fixed at a middle portion of the other guide plate 33, a first sorting groove for allowing only piston workpieces 1 whose peripheral surfaces are close to the bottom of the rotary drum 22 to pass is formed between the first sorting strip 34 and the bottom of the rotary drum 22, one of the blocking strips 32 in the middle portion of the sorting material channel has a notch 35, the bottom of the sorting material conveying groove is provided with a plurality of second sorting rods 36 positioned at the notches 35, each second sorting rod 36 is in smooth transition with the bottom of the sorting material conveying groove, the free end of each second sorting rod 36 faces the notches 35, the length of each second sorting rod 36 is smaller than the width of the sorting material conveying groove, the feeding conveying groove 21 is connected with the notches 35, a guide inclined plane is arranged between each notch 35 and the corresponding feeding sorting groove, and the tail end of the sorting material conveying channel 23 is communicated with the inner cavity of the rotary drum 22.

The middle part of the sorting and feeding channel 23 is higher than the two ends. The feeding conveying groove 21 is communicated with the notch 35 through a feeding bridge 37, a chute allowing the piston workpiece 1 to pass through is formed in the feeding bridge 37, a limiting piece limiting the piston workpiece 1 to be separated from the chute is arranged at an opening of the chute, the feeding bridge 37 is spiral, and the piston workpiece 1 on the opening is overturned by the feeding bridge 37 and then conveyed into the feeding conveying groove 21.

The rotary drum 22 rotates, particularly under the condition of material guiding, the piston workpiece 1 can enter the sorting material-conveying channel 23, the piston workpiece 1 vertically arranged in the rotary drum 22 can not enter the sorting material-conveying trough under the action of the first sorting bar 34, because the height of the piston workpiece 1 is larger than the diameter, the piston workpiece 1 which is only in a rolling state in the rotary drum 22 can enter the sorting material-conveying trough, under the stirring action of the sorting block 31 on the piston workpiece 1 in the rotary drum 22, the piston workpiece 1 can turn or roll under the stirring action, so that the piston workpiece 1 which is temporarily not capable of entering the sorting material-conveying channel 23 has the opportunity to enter again, the piston workpiece 1 which rolls into the sorting material-conveying channel 23 runs to the notch 35 along the sorting material-conveying channel 23, because one end of the piston workpiece 1 is open, the piston workpiece 1 which is opposite to the notch 35 is light because of the open end, and the end without the opening is heavy and topples, the toppled end slides into the material conveying bridge 37 through the guide inclined plane, the piston workpieces 1 which cannot be toppled are pushed down one by one in the inlet direction and fall into the rotary drum 22 again from the tail end, the piston workpieces 1 entering the material conveying bridge 37 are opened upwards, and the workpieces with the upward openings are turned over under the action of the spiral material conveying bridge 37, so that the openings face downwards and enter the feeding conveying groove 21.

As shown in fig. 2, 4, and 5, the positioning device includes a mounting block 41 fixed on the frame 2, a guide hole 42 in the same straight line with the bar-shaped mounting hole 11 on the piston workpiece 1 is formed in the mounting block 41, an avoiding hole 43 perpendicular to the guide hole 42 is further longitudinally formed in the mounting block 41, two symmetrically-arranged positioning rods are inserted into the avoiding hole 43, each positioning rod includes a guide portion 45 slidably connected in the guide hole 42 and a positioning portion 44 slidably connected in the avoiding hole 43, the positioning portion 44 extends out of the avoiding hole 43, a spring 46 for driving the positioning rod to move toward the middle of the guide hole 42 is connected between the outer end of the guide portion 45 and the hole wall of the guide hole 42, a wedge-shaped positioning inclined surface 47 is formed at the lower end of the guide portion 45, and a protrusion 48 adapted to the positioning inclined surface 47 is formed on the bottom surface of the middle of the guide hole 42.

The pressing structure is provided with a positioning device in one-to-one correspondence with the frame 2 and comprises a pressing arm 49 hinged on the frame 2, one end of the pressing arm 49 is connected with a hydraulic cylinder, the middle part of the pressing arm 49 is hinged on the frame 2, and the other end of the pressing arm 49 is provided with a pressing block capable of extruding the piston workpiece 1 positioned on the positioning rod.

Under the action of the workpiece taking manipulator 25, the piston workpiece 1 can be positioned on the positioning rod, and in an initial state, the two positioning rods are close to each other under the action of the spring leaf 46, so that the overall dimension of the two positioning rods is smaller than the width of the strip-shaped mounting hole 11 of the piston workpiece 1, so that the strip-shaped mounting holes 11 of the piston workpiece 1 can be freely sleeved on the two positioning rods, the pressing mechanism presses the end surface of the piston rod piece downwards to enable the piston rod piece to move downwards, at the same time, the positioning slope 47 of the lower end of the guide 45 moves to the outside of the guide hole 42 by the projection 48, and the distance between the two positioning rods is widened, so that the piston rod piece can be adjusted to the state that the length direction of the strip-shaped mounting hole 11 is consistent with the opening direction of the two positioning rods, so as to achieve the purpose of positioning the piston workpiece 1 before milling and chamfering by the milling and chamfering manipulator 26.

As shown in fig. 2, 8 and 10, the discharging device includes a rotating disc 51, the rotating disc 51 is rotatably connected to the frame 2, the end of the blanking conveying chute 24 is located above the rotating disc 51, a shifting plate 52 fixed on the frame 2 is arranged above the rotating disc 51, one end of the shifting plate 52 along the rotating direction of the rotating disc 51 is close to the center of the rotating disc 51, a discharging port is arranged at the center of the rotating disc 51, the discharging port penetrates through the upper and lower surfaces of the rotating disc 51, a discharging channel 53 smoothly transited to the upper surface of the rotating disc 51 is arranged at the discharging port, the inlet of the discharging channel 53 has a guiding part 45 with a larger width, the end of the discharging channel 53 is located below the rotating disc 51, a receiving disc 54 is fixedly arranged on the frame 2, a plurality of guiding assemblies are connected to the receiving disc 54, the guiding assemblies include two guiding bars 55, the gap and height between the two guiding bars 55 are adapted to, the guide bar 55 is gradually declined from the head end to the tail end.

The cutting groove 12 of the piston workpiece 1 is located in the middle of the peripheral surface of the piston workpiece 1, the guide bars 55 are fixed on the material receiving tray 54, the piston workpiece 1 is stacked and pushed in the material receiving tray 54, so that the piston workpiece 1 can slide away from the material receiving tray 54 along the two guide bars 55, and the tail ends of the two guide bars 55 are provided with packaging containers, so that the piston workpiece 1 can enter the packaging containers in order.

The dial plate 52 functions as: on one hand, the piston workpieces 1 are prevented from being accumulated at the outlet of the blanking conveying groove 24, on the other hand, the piston workpieces 1 are driven to move towards the middle of the rotary table 51, so that the piston workpieces 1 can enter the discharging channel 53 at the discharging opening, the piston workpieces 1 fall into the receiving disc 54 through the discharging channel 53, and the receiving disc 54 is fixed on the rack 2, so that the piston workpieces 1 enter the static receiving disc 54 and are conveyed into a packaging container under the action of the material guide assembly.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims (7)

1. The milling chamfer production line of the piston for the refrigerator compressor is characterized by comprising a plurality of piston workpieces (1), a rack (2), and a feeding mechanism, a positioning mechanism, a milling chamfer mechanism and a discharging mechanism which are sequentially arranged on the rack (2), wherein the feeding mechanism comprises a sorting device and a feeding conveying groove (21), the sorting device comprises a rotary drum (22) which is rotatably connected to the rack (2) and a sorting material conveying channel (23) which is fixed on the rack (2), and the discharging end of the sorting material conveying channel (23) is connected with the feeding conveying groove (21); the blanking mechanism comprises a blanking conveying groove (24) and a discharging device; the positioning mechanism comprises two positioning devices and two workpiece taking manipulators (25), one positioning device is close to the feeding conveying groove (21), the other positioning device is close to the discharging conveying groove (24), the chamfering milling mechanism comprises two chamfering milling manipulators (26) which are respectively opposite to the two positioning devices, the chamfering milling manipulators (26) can carry milling cutters to mill chamfers on piston workpieces (1) on the corresponding positioning devices, and one workpiece taking manipulator (25) can grab the piston workpieces (1) on the feeding conveying groove (21) to the positioning device close to the feeding conveying groove (21) one by one; the other workpiece taking manipulator (25) can grab the piston workpiece (1) close to the feeding conveying groove (21) to a positioning device close to the discharging conveying groove (24), and grab the piston workpiece (1) to the discharging conveying groove (24) after the milling and chamfering are finished.

2. The milling chamfer production line for the piston of the refrigerator compressor as claimed in claim 1, characterized in that the sorting feed channel (23) is arranged on a sorting block (31), the sorting block (31) is positioned in the rotary drum (22), the sorting feed channel (23) is a space between two parallel baffle bars (32) arranged on the sorting block (31), the inlet of the sorting feed channel (23) is close to the bottom surface of the rotary drum (22), the inlet of the sorting feed channel (23) is provided with two guide plates (33) with inclination angles, the guide plates (33) are fixed on the sorting block (31), a first sorting bar (34) is connected between the two guide plates (33), one end of the first sorting bar (34) is fixed at the outer end of one of the guide plates (33), and the other end of the first sorting bar (34) is fixed at the middle part of the other guide plate (33), a first sorting groove which only allows piston workpieces (1) with the peripheral surface close to the bottom of the rotary drum (22) to pass through is formed between the first sorting bar (34) and the bottom of the rotary drum (22), a notch (35) is formed in one of the blocking bars (32) in the middle of the sorting material feeding channel, a plurality of second sorting rods (36) located at the notch (35) are arranged at the bottom of the sorting material feeding channel, each second sorting rod (36) is in smooth transition with the bottom of the sorting material feeding channel, the free end of each second sorting rod (36) faces the notch (35), the length of each second sorting rod (36) is smaller than the width of the sorting material feeding channel, the feeding conveying groove (21) is connected with the notch (35), a guide inclined surface is formed between the notch (35) and the feeding material sorting groove, and the tail end of the sorting channel (23) leads to the inner cavity of the rotary drum (22).

3. The milling chamfer production line for the piston of the refrigerator compressor as claimed in claim 2, characterized in that the middle of the sorting feed channel (23) is higher than the two ends.

4. The milling and chamfering production line of the piston for the refrigerator compressor as claimed in claim 2, wherein the feeding conveying groove (21) is communicated with the notch (35) through a feeding bridge (37), the feeding bridge (37) is provided with a chute allowing the piston workpiece (1) to pass through, a limiting piece limiting the piston workpiece (1) to be separated from the chute is arranged at an opening of the chute, the feeding bridge (37) is spiral, and the feeding bridge (37) conveys the piston workpiece (1) on the opening into the feeding conveying groove (21) after overturning.

5. The milling chamfering production line of the piston for the refrigerator compressor according to the claim 1, 2 or 3, characterized in that the positioning device comprises a mounting block (41) fixed on the frame (2), the mounting block (41) is provided with a guide hole (42) which is in the same straight line with the strip-shaped mounting hole (11) on the piston workpiece (1), the mounting block (41) is also longitudinally provided with an avoiding hole (43) which is perpendicular to the guide hole (42), two symmetrically arranged positioning rods are inserted in the avoiding hole (43), each positioning rod comprises a guide part (45) which is slidably connected in the guide hole (42) and a positioning part (44) which is slidably connected in the avoiding hole (43), the positioning part (44) extends out of the avoiding hole (43), a positioning rod is connected between the outer end of the guide part (45) and the hole wall of the guide hole (42) to drive a reed (46) which moves towards the middle part of the guide hole (42), the lower end of the guide part (45) is provided with a wedge-shaped positioning inclined surface (47), and the bottom surface of the middle part of the guide hole (42) is provided with a convex block (48) matched with the positioning inclined surface (47).

6. The milling and chamfering production line of the piston for the refrigerator compressor as claimed in claim 5, characterized in that the rack (2) is provided with a one-to-one corresponding pressing structure of the positioning device, the pressing structure comprises a pressing arm (49) hinged on the rack (2), one end of the pressing arm (49) is connected with a hydraulic cylinder, the middle part of the pressing arm (49) is hinged on the rack (2), and the other end of the pressing arm (49) is provided with a pressing block capable of pressing the piston workpiece (1) positioned on the positioning rod.

7. The milling chamfer production line of the piston for the refrigerator compressor as claimed in claim 1, 2 or 3, wherein the discharging device comprises a rotary table (51), the rotary table (51) is rotatably connected to the frame (2), the end of the blanking conveying trough (24) is located above the rotary table (51), a shifting plate (52) fixed on the frame (2) is arranged above the rotary table (51), one end of the shifting plate (52) along the rotation direction of the rotary table (51) is close to the center of the rotary table (51), a discharging port is arranged at the center of the rotary table (51) and penetrates through the upper and lower surfaces of the rotary table (51), a discharging channel (53) smoothly transiting to the upper surface of the rotary table (51) is arranged at the discharging port, a guiding part (45) is arranged at the inlet of the discharging channel (53), and the end of the discharging channel (53) is located below the rotary table (51), the piston workpiece receiving device is characterized in that a receiving disc (54) is fixedly arranged on the rack (2), a plurality of groups of material guiding assemblies are connected to the receiving disc (54), each material guiding assembly comprises two guide bars (55), the gap and the height between the two guide bars (55) are matched with the cutting grooves (12) in the piston workpiece (1), and the guide bars (55) gradually decline from the head end to the tail end.

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