CN213566657U - Combined aerosol filling equipment - Google Patents

Abstract

A combined aerosol filling device comprises a workbench, a feed inlet arranged on the workbench, a motor arranged on the workbench, a turntable arranged on the workbench, a C-shaped plate arranged on the workbench, a roller arranged on the C-shaped plate, a self-adapting mechanism arranged on the turntable, a filling mechanism arranged on the workbench, a cover placing mechanism arranged on the workbench, a cover rolling part arranged on the workbench, an inflating part arranged on the workbench, a discharging mechanism arranged on the workbench, a material conveying mechanism arranged on the workbench and a collecting mechanism arranged on the workbench; the utility model can arrange and collect the processed tank body through the arrangement of the collecting mechanism; through the setting of putting the lid mechanism, can place the lid by the hole center of the automatic alignment jar body, make the operation of rolling the lid of next step more smooth.

Description

Combined aerosol filling equipment

Technical Field

The utility model belongs to the technical field of the aerial fog filling, especially, relate to a modular aerosol filling equipment.

Background

The existing aerial fog filling equipment is generally an automatic production line, filling bottles move on a conveyor belt in sequence, and a filling mechanism automatically identifies tank bodies and respectively performs high-pressure gas filling and material filling. After the aerial fog filling machine identifies the tank body in place through the probe, the filling head is controlled to descend, and the filling nozzle is sleeved on the tank body to carry out high-pressure gas filling or fire extinguishing agent filling; the existing filling equipment is not provided with a device for collecting the tank bodies, and the tank bodies are generally taken down from a conveying belt manually.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome prior art not enough, provide a binary bag aerial fog filling equipment of self-adaptation.

In order to achieve the above purpose, the utility model adopts the following technical scheme: a combined aerosol filling device comprises a workbench, a feed inlet arranged on the workbench, a motor arranged on the workbench, a turntable arranged on the workbench, a C-shaped plate arranged on the workbench, a roller arranged on the C-shaped plate, a self-adapting mechanism arranged on the turntable, a filling mechanism arranged on the workbench, a cover placing mechanism arranged on the workbench, a cover rolling part arranged on the workbench, an inflating part arranged on the workbench, a discharging mechanism arranged on the workbench, a material conveying mechanism arranged on the workbench and a collecting mechanism arranged on the workbench; the collecting mechanism comprises a collecting cabinet, a jacking plate arranged on the collecting cabinet, a jacking spring arranged on the jacking plate, an alignment push rod arranged on the workbench, an alignment plate arranged on the alignment push rod, a collecting box assembly arranged on the collecting cabinet and a limiting assembly arranged on the collecting cabinet; the self-adaptive mechanism comprises an arc-shaped opening, a first arc-shaped plate arranged on the arc-shaped opening, a second arc-shaped plate arranged on the arc-shaped opening, a third arc-shaped plate arranged on the arc-shaped opening, a sliding chute arranged on the arc-shaped opening, a spring arranged on the first arc-shaped plate, a sliding plate arranged on the rotary table, a strip-shaped groove arranged on the rotary table and a supporting spring arranged on the sliding plate; the collecting box is ejected upwards by the acting force of the ejecting spring on the ejecting plate; the first arc-shaped plate, the second arc-shaped plate and the third arc-shaped plate can adapt to the tank bodies with various diameters through the sliding fit of the sliding grooves and the springs; the sliding plate is fixedly connected with the second arc-shaped plate, and the position of the sliding plate is fixed through a supporting spring; when the tank body extrudes the second arc-shaped plate, the sliding plate can slide in the strip-shaped groove, and the force of the tank body extruding the second arc-shaped plate is greater than the supporting force of the supporting spring to the sliding plate.

Furthermore, the collecting box assembly comprises a collecting box, a leakage-proof part arranged on the collecting box, a transverse limiting strip arranged on the collecting box, a transverse limiting groove arranged on the collecting box and a longitudinal limiting part arranged on the collecting box; the collecting boxes are vertically stacked together in the collecting cabinet, and the collecting boxes are limited to move rightwards through the transverse limiting grooves.

Further, the leakage-proof part comprises a leakage-proof plate, a leakage-proof plate shaft arranged on the collecting box, a leakage-proof torsion spring arranged on the leakage-proof plate shaft, a first avoidance groove arranged on the collecting box and a second avoidance groove arranged on the collecting box; the force of the leakage-proof torsional spring on the leakage-proof plate can only make the tank body not enter, and the tank body is prevented from leaking from the feed inlet.

Furthermore, the longitudinal limiting part comprises a longitudinal strip, a longitudinal spring arranged on the longitudinal strip and a longitudinal groove arranged on the collecting box; vertical strip prevents that the jar body from rocking about, during the feeding, and the chamfer on the vertical strip of jar body accessible pushes down vertical strip and places the jar body in place.

Furthermore, the limiting assembly comprises a side blocking strip, a blocking strip groove arranged on the collecting cabinet, a cylindrical groove arranged on the blocking strip, a limiting column arranged on the collecting cabinet, a limiting spring arranged on the collecting cabinet, a pull rod arranged on the limiting column, a rotating strip arranged on the pull rod, a clamping groove arranged on the collecting cabinet and an upper limiting groove arranged on the collecting cabinet; the lateral barrier strips are arranged to prevent the tank body from impacting the collecting box to cause the collecting box to displace during feeding; when the collecting box is taken out, the collecting box can be taken out by fixing the stop strip through the fixed matching of the limiting column and the cylindrical groove on the stop strip.

Further, the discharging mechanism comprises a funnel, a leakage opening arranged on the funnel, a front conveying shaft arranged on the workbench, a rear conveying shaft arranged on the workbench, a transmission motor arranged on the rear conveying shaft, a conveying belt arranged on the workbench, a fixed cylinder arranged on the workbench, a cylinder plate arranged on the fixed cylinder, a cylinder shaft arranged on the fixed cylinder, a cylinder torsion spring arranged on the fixed cylinder, a buffer plate arranged on the fixed cylinder and a buffer spring arranged on the buffer plate; the tank body filled with the materials falls into the fixed cylinder on the conveyor belt below through the funnel, and the fixed cylinder is internally provided with a buffer block capable of buffering the impact force between the tank body and the conveyor belt.

Further, the material conveying mechanism comprises a material conveying motor, a material conveying shaft arranged on the material conveying motor, a gripper frame arranged on the material conveying shaft, a moving block arranged on the gripper frame and a gripper arranged on the gripper frame; drive the fortune material axle through fortune material motor and rotate, start the tongs and shift out the jar body in the fixed section of thick bamboo through side bobbin board position, after jar body is whole to be removed, rebound to the normal position with the bobbin board through a section of thick bamboo torsional spring.

Further, the filling mechanism comprises a bracket, a sliding block arranged on the bracket, a filling head arranged on the sliding block, a moving groove arranged on the bracket, an arc-shaped strip arranged on the sliding block and an arc-shaped groove arranged on the sliding plate; the arc-shaped strip is provided with a chamfer; the arc-shaped strip is connected with the sliding plate in a sliding way to control the central position of the filling head, so that the arc-shaped strip can be conveniently aligned to the center of the tank body and is convenient to fill; the chamfer can make the arc-shaped strip slide into the arc-shaped groove more easily.

Further, the cover placing mechanism comprises a cover storing box, a cover pushing plate arranged on the cover storing box, a pushing plate spring arranged on the cover storing box, a cover placing frame arranged on the workbench, a cover placing motor arranged on the workbench, a cover placing push rod arranged on the cover placing frame, a cover clamping head arranged on the cover placing push rod, an arc strip arranged on the sliding plate, a positioning column arranged on the arc strip, a positioning slide column arranged on the C-shaped plate and a push rod groove arranged on the arc strip; the arc-shaped strip is fixed through the matching of the positioning column and the positioning sliding column; a push rod groove is arranged above the arc-shaped strip, and when the cover placing motor drives the cover placing frame to do reciprocating rotation motion, the cover and the tank body are aligned through contact matching with the push rod groove.

In summary, the utility model can arrange and collect the processed tank body through the arrangement of the collecting mechanism; through the setting of putting the lid mechanism, can place the lid by the hole center of the automatic alignment jar body, make the operation of rolling the lid of next step more smooth.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an enlarged view of fig. 1 at a.

Fig. 3 is an enlarged view of fig. 1 at B.

Fig. 4 is an enlarged view of fig. 1 at C.

Fig. 5 is a side view of the present invention.

Fig. 6 is a cross-sectional view taken at D-D of fig. 5.

Fig. 7 is an enlarged view of fig. 6 at E.

Fig. 8 is an enlarged view of fig. 6 at F.

Fig. 9 is a rear view of the present invention.

Fig. 10 is a sectional view taken at H-H of fig. 9.

Fig. 11 is an enlarged view at L of fig. 10.

Fig. 12 is a sectional view at G-G of fig. 9.

Fig. 13 is an enlarged view of fig. 12 at M.

Fig. 14 is a cross-sectional view taken at K-K of fig. 9.

Detailed Description

As shown in fig. 1 to 14, a combined aerosol filling apparatus comprises a workbench 1, a feed inlet 10, a motor 2, a turntable 3, a C-shaped plate 5, a roller 501, a self-adapting mechanism, a filling mechanism, a cap placing mechanism, a cap rolling part 11, an inflating part 12, a discharging mechanism, a material transporting mechanism and a collecting mechanism; the workbench 1 is a square bottomless shell; the feed inlet 10 is positioned at the front end of the workbench 1; the motor 2 is fixed on the upper surface of the inside of the shell of the workbench 1; the turntable 3 is fixedly connected with the motor 2 and is positioned on the workbench 1; the C-shaped plate 5 and the rotary table 3 are coaxial C-shaped arc plates; the roller 501 is rotatably connected to the inner side of the C-shaped plate 5; the self-adaptive mechanism is positioned on the turntable 3; the filling mechanism is positioned on the outer side of the C-shaped plate 5, and the central line of the filling mechanism is superposed with the central line of the self-adaptive mechanism; the cover placing mechanism is positioned at the rear end of the filling mechanism; the cover rolling part 11 is positioned at the rear end of the cover placing mechanism; the inflation part 12 is positioned at the rear end of the rolling cover part; the discharging mechanism is positioned inside the shell of the workbench 1; the material conveying mechanism is positioned at the tail part of the workbench 1; the collecting mechanism is positioned at the left end of the discharging mechanism.

Specifically, the collecting mechanism comprises a collecting cabinet 9, a jacking plate 990, a jacking spring 991, an alignment push rod 13, an alignment plate 14, a collecting box assembly and a limiting assembly; the collecting cabinet 9 is fixedly connected to the rear end of the workbench 1; the jacking plate 990 is slidably connected inside the collection cabinet 9 and is fixed with the regular spring 901 in a threaded manner, and the other end of the jacking spring 991 is fixed with the bottom of the collection cabinet 9 in a threaded manner; the aligning push rod 13 is fixedly connected to the workbench 1; the alignment plate 14 is fixedly attached to the movable end of the alignment push rod 13.

Specifically, the collecting box assembly comprises a collecting box 94, a leakage-proof part, a transverse limiting strip 95, a transverse limiting groove and a longitudinal limiting part; the collection box 94 is a rectangular, coverless housing; the transverse limiting strip 95 is in sliding fit with the transverse limiting groove to limit the collection box 94 to slide rightwards; the leakage-proof part comprises a leakage-proof plate 97, a leakage-proof plate shaft 971, a leakage-proof torsion spring 972, a first avoidance groove 973 and a second avoidance groove 974; the position of the leak-proof plate 97 is controlled by the acting force of the leak-proof plate shaft 971 and a leak-proof torsion spring 972 on the leak-proof plate shaft 971; the first avoidance groove 973 is located at the right end of the collection tank 94; the second escape groove 974 is located at the front end of the inner wall of the collection tank 94; the tank body can only enter but not exit through the force of the leak-proof torsion spring 972 on the leak-proof plate 97, so that the tank body is prevented from leaking from the feed inlet; the longitudinal limiting component comprises a longitudinal strip 98, a longitudinal spring 981 and a longitudinal groove 99; the longitudinal bar 98 is slidingly coupled in a longitudinal slot 99 of the inner bottom wall of the collecting box 94 by means of a longitudinal spring 981; the longitudinal strips prevent the tank body from shaking left and right; in feeding, the cans may be placed in position by pressing down on the longitudinal strips 98 by the chamfers on the longitudinal strips 98.

Specifically, the limiting assembly comprises a side barrier strip 90, a barrier strip groove 901, a cylindrical groove 902, a limiting column 91, a limiting spring 911, a pull rod 912, a rotating strip 913, a clamping groove 92 and an upper limiting groove 93; the side barrier strips 90 are rotatably connected to the collecting cabinet 9; the bar retaining groove 901 is positioned on the rear wall of the workbench 1; the cylindrical groove 902 is located on the side barrier strip 90; the limiting column 91 is connected to the collecting cabinet 9 in a sliding manner; the limiting spring 911 is positioned between the collecting cabinet 9 and the limiting column 91, and the pull rod 912 is fixedly connected to the side edge of the limiting column 91; the rotating bar 913 is rotatably connected to the pull rod 912; the clamping groove 92 is positioned on the collecting cabinet 9 and clamped with the rotating strip 913; the upper limiting groove 93 is fixedly connected with the transverse limiting strip 95 at the uppermost end; preventing the collection bin 94 from moving upward.

Specifically, the discharging mechanism comprises a funnel 8, a leakage opening 80, a front conveying shaft 81, a rear conveying shaft 82, a transmission motor 87, a conveying belt 83, a fixed cylinder 84, a cylinder plate 841, a cylinder shaft 842, a cylinder torsion spring 843, a buffer plate 85 and a buffer spring 86; the funnel 8 is fixedly connected to the workbench 1; the lower part is provided with a funnel 80; the front transmission shaft 81 and the rear transmission shaft 82 are rotatably connected to the worktable 1; the conveyor belt 84 is rotatably connected to the money conveying shaft 81 and the rear transmission shaft 82; the transmission motor 87 is fixedly connected on the workbench 1 and fixedly connected with the rear transmission shaft 82; the fixed cylinders 84 are uniformly and fixedly connected on the conveyor belt 83; the barrel plate 841 is symmetrically arranged on the fixed barrel 84 through the barrel shaft 842 and the barrel torsion spring 843; a buffer plate 85 and a buffer spring 86 are disposed inside the fixed cylinder 84.

Specifically, the material conveying mechanism comprises a material conveying motor 871, a material conveying shaft 88, a gripper frame 89, a moving block 891 and a gripper 892; the material conveying device 871 is fixed on the workbench 1; the material conveying shaft 88 is rotationally connected with the workbench 1; an arc-shaped closed groove for enabling the gripper frame 89 to move back and forth is formed in the material conveying shaft 88; the gripper frame 89 can move in a rectangular groove on the workbench 1, and a fixed shaft is arranged in the rectangular groove to limit the moving direction of the gripper frame 89; the gripper frame 89 is connected with the arc-shaped closed groove in a sliding manner through a moving block 891 at the lower part; the hand grip 892 is fixedly attached to the hand grip bracket 89.

Specifically, the filling mechanism comprises a bracket 7, a slide block 70, a filling head 71, a moving groove 72, an arc-shaped strip 73 and an arc-shaped groove 74; the arc-shaped strip 73 is provided with a chamfer 731; the bracket 7 is fixed on the workbench 1; the slider 70 is in sliding fit with the moving slot 72; the filling head 71 is fixedly connected to the slide block 70; the arc-shaped strip 73 is fixedly connected to the sliding block 70 and is in sliding fit with the arc-shaped groove 74 on the sliding plate 45; the arc-shaped strip 73 is provided with a chamfer 731; chamfer 731 makes it easier for arced strip 73 to slide into arced slot 74.

Specifically, the adaptive mechanism comprises an arc-shaped opening 4, a first arc-shaped plate 40, a second arc-shaped plate 41, a third arc-shaped plate 42, a sliding chute 43, a spring 44, a sliding plate 45, a strip-shaped groove 31 and a supporting spring 46; the first arc-shaped plate 40 is connected with a sliding chute 43 on the arc-shaped opening 4 in a sliding way through a spring 44; the connection mode of the second arc-shaped plate 41 and the third arc-shaped plate 42 with the sliding chute 43 is the same as the connection mode of the first arc-shaped plate 40 with the sliding chute 43, which is not repeated herein; the sliding plate 45 is fixedly connected to the upper end of the second arc-shaped plate 41 and is in sliding fit with the strip-shaped groove 31; two ends of the supporting spring 46 are respectively fixed on the sliding plate 45 and the rotary disc 3 in a threaded manner.

Specifically, the cover placing mechanism comprises a cover storage box 75, a cover push plate 751, a push plate spring, a cover placing frame 76, a cover placing motor 761, a cover placing push rod 762, a cover clamping head 763, an arc-shaped strip 77, a positioning column 771, a positioning sliding column 51 and a push rod groove 773; the cover storage box 75 is fixed on the workbench 1; the cover is extruded by the acting force of the inner push plate bomb yellow 752 on the cover push plate 751, so that the end part is always in a covered state; the cover placing frame 76 is rotationally fixed on the workbench 1, and the cover placing motor 761 is fixed on the workbench 1 and is fixedly connected with the cover placing frame 76; the bottom of the cover placing frame 76 is provided with a cylinder which is in sliding fit with the arc-shaped groove on the workbench 1 and can limit the moving distance of the cover placing frame 76; the cover placing push rod 762 is connected to the cover placing frame 76 in a sliding manner; the cap clamping head 763 is fixedly connected to the cap placing push rod 762; the arc-shaped strip 77 is slidably connected to the sliding plate 45; the positioning post 771 is fixedly connected to the arc-shaped strip 77; the positioning slide column 51 is connected with the positioning column 771 in a sliding manner and fixed at the upper end of the C-shaped plate 5; the push rod slot 773 is fixedly connected to the upper end of the arc-shaped strip 77.

The working principle is as follows: the tank body is uniformly placed in the feeding hole 10, the tank body slides to a position among the first arc-shaped plate 40, the second arc-shaped plate 41 and the third arc-shaped plate 42 by utilizing a push rod at the end part of the feeding hole 10, the motor 2 rotates to drive the rotary table 3 to rotate, meanwhile, the tank body is driven to rotate to a position between the arc-shaped opening 4 on the rotary table 3 and the C-shaped plate 5, and the friction between the tank body and the C-shaped plate 5 is reduced through a rolling shaft 501 on the C-shaped plate 5; in order to adapt to the cans of different sizes, the first arc-shaped plate 40, the second arc-shaped plate 41 and the third arc-shaped plate 42 are extruded by the cans, and the second arc-shaped plate 41 drives the sliding plate 45, so that the arc-shaped strip 73 drives the sliding block 70 to move, and thus, the center shafts of the cans and the filling head 71 can be aligned, and the cans can be filled; after the materials are filled, the next step of cover placing is carried out, a cover placing motor 761 is started to drive a cover placing frame 76 to rotate to a position right above the end cover of the cover storage box 75, the cover is taken out by a cover clamping head 763, the cover placing frame 76 is rotated back to the original position, and the cover is placed in the tank body through a cover placing push rod 762; then the next step of capping part 11 and inflation part 12 is carried out; after filling, starting a transmission motor 87, sliding into a fixed barrel 84 through a funnel 8, reducing the impact force between a conveyor belt 83 and the tank body through a buffer plate 85, conveying the tank body to the outside of the workbench 1 by rotating the conveyor belt 83, starting a material conveying motor 871, firmly grabbing the tank body through a gripper 892, and then moving the tank body to the left into a collection cabinet 9; after the tank body is integrally removed, the drum plate 841 rebounds to the original position through the drum torsion spring 843; after the stacking is carried out in a row, the aligning push rod 13 is started and pushed to the rearmost by the aligning plate 14, and then repeated action is carried out until all the stacking is full; the barrier strip 90 is slid upwards from the barrier strip groove 901 to a vertical position, the rotary strip 913 is rotated into the clamping groove 92 to be fixed after the barrier strip 90 is fixed by utilizing the clamping fit of the limiting column 91 and the cylindrical groove 902, and the collecting box 94 is taken out.

Claims (9)

1. A combined aerosol filling device comprises a workbench (1), a feed inlet (10) arranged on the workbench, a motor (2) arranged on the workbench, a turntable (3) arranged on the workbench, a C-shaped plate (5) arranged on the workbench, a roller (501) arranged on the C-shaped plate, a self-adapting mechanism arranged on the turntable, a filling mechanism arranged on the workbench, a cover placing mechanism arranged on the workbench, a cover rolling part (11) arranged on the workbench, an inflating part (12) arranged on the workbench, a discharging mechanism arranged on the workbench, a material conveying mechanism arranged on the workbench and a collecting mechanism arranged on the workbench; the method is characterized in that: the collecting mechanism comprises a collecting cabinet (9), a jacking plate (990) arranged on the collecting cabinet, a jacking spring (991) arranged on the jacking plate, an alignment push rod (13) arranged on the workbench, an alignment plate (14) arranged on the alignment push rod, a collecting box assembly arranged on the collecting cabinet and a limiting assembly arranged on the collecting cabinet; the self-adaptive mechanism comprises an arc-shaped opening (4), a first arc-shaped plate (40) arranged on the arc-shaped opening, a second arc-shaped plate (41) arranged on the arc-shaped opening, a third arc-shaped plate (42) arranged on the arc-shaped opening, a sliding groove (43) arranged on the arc-shaped opening, a spring (44) arranged on the first arc-shaped plate, a sliding plate (45) arranged on the turntable, a strip-shaped groove (31) arranged on the turntable and a supporting spring (46) arranged on the sliding plate.

2. A modular aerosol filling apparatus according to claim 1, wherein: the collecting box assembly comprises a collecting box (94), a leakage-proof component arranged on the collecting box, a transverse limiting strip (95) arranged on the collecting box, a transverse limiting groove arranged on the collecting box and a longitudinal limiting component arranged on the collecting box.

3. A modular aerosol filling apparatus according to claim 2, wherein: the leak protection part includes leak protection board (97), locates leak protection board axle (971) on the collecting box, locates the epaxial leak protection torsional spring of leak protection board (972), locate first groove (973) of dodging on the collecting box and locating second on the collecting box dodges groove (974).

4. A modular aerosol filling apparatus according to claim 2, wherein: the longitudinal limiting component comprises a longitudinal strip (98), a longitudinal spring (981) arranged on the longitudinal strip and a longitudinal groove (99) arranged on the collecting box.

5. A modular aerosol filling apparatus according to claim 1, wherein: the limiting assembly comprises a lateral blocking strip (90), a blocking strip groove (901) formed in the collection cabinet, a cylindrical groove (902) formed in the blocking strip, a limiting column (91) formed in the collection cabinet, a limiting spring (911) formed in the collection cabinet, a pull rod (912) formed in the limiting column, a rotating strip (913) formed in the pull rod, a clamping groove (92) formed in the collection cabinet and an upper limiting groove (93) formed in the collection cabinet.

6. A modular aerosol filling apparatus according to claim 1, wherein: discharge mechanism includes funnel (8), locates leak source (80) on the funnel, locates preceding transmission axle (81) on the workstation, locate back transmission axle (82) on the workstation, locate the epaxial driving motor (87) of back transmission, locate conveyer belt (83) on the workstation, locate gu fixed cylinder (84) on the workstation, locate tube sheet (841) on the gu fixed cylinder, locate last tube sheet (842) of the fixed cylinder and locate section torsional spring (843) on the gu fixed cylinder, locate dash board (85) on the gu fixed cylinder and locate buffer spring (86) on the dash board.

7. A modular aerosol filling apparatus according to claim 1, wherein: the material conveying mechanism comprises a material conveying motor (871), a material conveying shaft (88) arranged on the material conveying motor, a gripper frame (89) arranged on the material conveying shaft, a moving block (891) arranged on the gripper frame and a gripper (892) arranged on the gripper frame.

8. A modular aerosol filling apparatus according to claim 1, wherein: the filling mechanism comprises a support (7), a sliding block (70) arranged on the support, a filling head (71) arranged on the sliding block, a moving groove (72) arranged on the support, an arc-shaped strip (73) arranged on the sliding block and an arc-shaped groove (74) arranged on the sliding plate; the arc-shaped strip (73) is provided with a chamfer (731).

9. A modular aerosol filling apparatus according to claim 1, wherein: put and cover mechanism including storing up lid case (75), locating store up lid push pedal (751) on the lid case, locate push pedal spring on the lid case, locate put on the workstation and cover frame (76), locate put on the workstation and cover motor (761), locate put and cover push rod (762), locate put and cover the overhead press from both sides of putting and cover head (763), locate on the push rod arc is rectangular (77) on the sliding plate, locate reference column (771) on the arc is rectangular, locate location traveller (51) on the C template and locate push rod groove (773) on the arc is rectangular.

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