Workshop iron fillings recovery unit
1. The utility model provides a workshop iron fillings recovery unit which characterized in that: comprises a power mechanism and a collecting mechanism, wherein the collecting mechanism comprises two fixed plates, a C-shaped plate, two movable wheels, two disks, three fixed rods, three arc-shaped baffles, three arc-shaped electromagnets, six ejecting blocks and two first fixed blocks, the two fixed plates are fixedly connected through the C-shaped plate, the C-shaped plate is connected with the power mechanism, the two movable wheels are rotatably assembled on one sides of the two fixed plates through rotating shafts, the two disks are rotatably assembled on one sides of the two fixed plates respectively, the two rotating shafts of the movable wheels respectively penetrate through the two fixed plates and are in transmission connection with the two disks, the three fixed rods are fixedly connected between the two disks, the three fixed rods are uniformly distributed on the circumference, one ends of the three arc-shaped baffles are respectively and elastically hinged with the three fixed rods, the other end of the arc-shaped electromagnet is abutted against the inner side of the adjacent fixed rod, the three arc-shaped electromagnets are respectively installed on the surfaces of the three arc-shaped baffles, every two of the ejector blocks are respectively installed at the left end and the right end of each arc-shaped baffle in a group, each ejector block is located on one side far away from the hinge point of each arc-shaped baffle, the two first fixed blocks are respectively fixed on the upper sides of the two fixed plates and are matched with the ejector blocks, the conductive pins are respectively arranged on one sides far away from the hinge point at the left end and the right end of each arc-shaped baffle, the conductive pins are electrically connected with the corresponding arc-shaped electromagnets, and the two discs are respectively provided with conductive sheets matched with the conductive pins.
2. The workshop scrap iron recycling device according to claim 1, characterized in that: the power mechanism is an unmanned vehicle main body, the C-shaped plate is connected with the rear side of the unmanned vehicle main body, and the driving wheel of the unmanned vehicle main body is in transmission connection with the two moving wheels through a transmission belt.
3. The workshop scrap iron recycling device according to claim 1, characterized in that: the C-shaped plate upside is equipped with electric power component, electric power component includes box, group battery, controller, the box is connected with the C-shaped plate, the group battery and the controller is all located in the box, the group battery with controller electric connection, the controller with conducting strip electric connection.
4. The workshop scrap iron recycling device according to claim 3, characterized in that: the box upside rotates and is connected with the chamber door, the chamber door is equipped with the sealing strip, the box be equipped with sealing strip assorted seal groove.
5. The workshop scrap iron recycling device according to claim 1, characterized in that: the lower sides of the two fixing plates are respectively provided with a discharging assembly, each discharging assembly comprises a sliding block, a spring, a connecting block and a second fixing block, the lower sides of the fixing plates are provided with a sliding groove, the sliding blocks are assembled in the sliding grooves in a sliding mode, the springs are located between the upper sides of the sliding blocks and the sliding grooves, one end of each connecting block is connected with the corresponding sliding block, the other end of each connecting block is connected with the corresponding second fixing block, each sliding groove is provided with a groove matched with the corresponding connecting block, and the corresponding second fixing block is matched with the corresponding ejector block; two stay cord grooves are formed between the fixed plates and the C-shaped plates, stay cords are arranged in the two stay cord grooves, one ends of the stay cords are connected with the upper sides of the two sliding blocks respectively, and the other ends of the stay cords are connected with operating parts together.
6. The workshop scrap iron recycling device according to claim 5, characterized in that: the operating parts include slide, screw rod and handle, the C shaped plate is equipped with the motion groove, the slide sliding assembly in the motion groove, the slide lower extreme is connected with two the stay cord, the screw rod rotate the assembly in the slide upside, the motion groove upside is equipped with the screw thread through-hole, the screw rod upside stretches out the screw thread through-hole and with screw thread through-hole threaded connection, the handle is fixed to be located the screw rod upper end.
7. The workshop scrap iron recycling device according to claim 6, characterized in that: and an anti-slip sleeve is arranged on the outer side of the handle.
8. The workshop scrap iron recycling device according to claim 1, characterized in that: the first fixed block and the second fixed block are symmetrically distributed along the circular mandrel of the disc, and the included angle between the first fixed block and the horizontal plane is larger than 30 degrees and smaller than 60 degrees.
Background
In an industrial production workshop, when machines such as a lathe, a milling machine, a grinding machine, a planer and the like are used for processing workpieces, a large amount of scrap iron can be generated, and the larger part of the scrap iron is scattered at each corner of the workshop due to low recovery rate of the equipment, so that not only is the environment seriously polluted, but also a large amount of resources are wasted.
At present, when scrap iron scattered in a workshop is collected, a manual cleaning and screening mode is mostly adopted, time and labor are wasted, and therefore, the scrap iron recycling device for the workshop is very necessary to be invented.
Disclosure of Invention
The purpose of the invention is: aim at providing a workshop iron fillings recovery unit, make up into a cask through three cowl and three dead lever, utilize the last electromagnet of cowl to adsorb subaerial iron fillings, it makes first fixed block promotion kicking block to rotate the upside when cowl, then cowl will rotate downwards and form the opening, the electromagnet will cut off the power supply and do not produce magnetic force simultaneously, iron fillings on the electromagnet of arc will drop to collecting in the cask through the opening under the effect of gravity like this.
A workshop scrap iron recovery device comprises a power mechanism and a collection mechanism, wherein the collection mechanism comprises two fixed plates, a C-shaped plate, two movable wheels, two disks, three fixed rods, three arc-shaped baffles, three arc-shaped electromagnets, six ejector blocks and two first fixed blocks, the two fixed plates are fixedly connected through the C-shaped plate, the C-shaped plate is connected with the power mechanism, the two movable wheels are rotatably assembled at one sides far away from the two fixed plates through rotating shafts, the two disks are respectively rotatably assembled at one sides opposite to the two fixed plates, the rotating shafts of the two movable wheels respectively penetrate through the two fixed plates and are in transmission connection with the two disks, the three fixed rods are fixedly connected between the two disks, the three fixed rods are uniformly distributed in a circumference manner, one ends of the three arc-shaped baffles are respectively and elastically hinged with the three fixed rods, the other end of the arc-shaped electromagnet is abutted against the inner side of the adjacent fixed rod, the three arc-shaped electromagnets are respectively installed on the surfaces of the three arc-shaped baffles, every two of the ejector blocks are respectively installed at the left end and the right end of each arc-shaped baffle in a group, each ejector block is located on one side far away from the hinge point of each arc-shaped baffle, the two first fixed blocks are respectively fixed on the upper sides of the two fixed plates and are matched with the ejector blocks, the conductive pins are respectively arranged on one sides far away from the hinge point at the left end and the right end of each arc-shaped baffle, the conductive pins are electrically connected with the corresponding arc-shaped electromagnets, and the two discs are respectively provided with conductive sheets matched with the conductive pins.
The power mechanism is an unmanned vehicle main body, and the C-shaped plate is connected with the rear side of the unmanned vehicle main body; the driving wheel of the unmanned vehicle main body is in transmission connection with the two moving wheels through a transmission belt.
The C-shaped plate upside is equipped with electric power component, electric power component includes box, group battery, controller, the box is connected with the C-shaped plate, the group battery and the controller is all located in the box, the group battery with controller electric connection, the controller with conducting strip electric connection.
The box upside rotates and is connected with the chamber door, the chamber door is equipped with the sealing strip, the box be equipped with sealing strip assorted seal groove.
The lower sides of the two fixing plates are respectively provided with a discharging assembly, each discharging assembly comprises a sliding block, a spring, a connecting block and a second fixing block, the lower sides of the fixing plates are provided with a sliding groove, the sliding blocks are assembled in the sliding grooves in a sliding mode, the springs are located between the upper sides of the sliding blocks and the sliding grooves, one end of each connecting block is connected with the corresponding sliding block, the other end of each connecting block is connected with the corresponding second fixing block, each sliding groove is provided with a groove matched with the corresponding connecting block, and the corresponding second fixing block is matched with the corresponding ejector block; two stay cord grooves are formed between the fixed plates and the C-shaped plates, stay cords are arranged in the two stay cord grooves, one ends of the stay cords are connected with the upper sides of the two sliding blocks respectively, and the other ends of the stay cords are connected with operating parts together.
The operating parts include slide, screw rod and handle, the C shaped plate is equipped with the motion groove, the slide sliding assembly in the motion groove, the slide lower extreme is connected with two the stay cord, the screw rod rotate the assembly in the slide upside, the motion groove upside is equipped with the screw thread through-hole, the screw rod upside stretches out the screw thread through-hole and with screw thread through-hole threaded connection, the handle is fixed to be located the screw rod upper end.
And an anti-slip sleeve is arranged on the outer side of the handle.
The first fixed block and the second fixed block are symmetrically distributed along the circular mandrel of the disc, and the included angle between the first fixed block and the horizontal plane is larger than 30 degrees and smaller than 60 degrees.
When scrap iron on the workshop ground is collected, the power mechanism drives the moving wheel to rotate, the disc continuously rotates, and thus when an arc electromagnet moves to the upper side, the inclined plane of the top block of the arc baffle plate is in contact with the first fixed block, the arc baffle plate is pushed to rotate downwards along the hinged point to form an opening; can improve the rate of recovery to the steel fillings through the device to reduce staff's working strength.
Drawings
The invention is further illustrated by the non-limiting examples given in the accompanying drawings;
FIG. 1 is a schematic structural diagram of an embodiment of a scrap iron recycling device for a workshop according to the present invention;
FIG. 2 is a schematic view of the collection mechanism of the present invention;
FIG. 3 is a schematic cross-sectional view of the collecting mechanism of the present invention;
FIG. 4 is a schematic view of the internal structure of the collection mechanism of the present invention;
FIG. 5 is an enlarged view of the structure at A in FIG. 4;
FIG. 6 is an exploded view of the internal structure of the collection mechanism of the present invention;
FIG. 7 is an enlarged view of the structure at B in FIG. 6;
FIG. 8 is a schematic cross-sectional view of the interior of the collection mechanism of the present invention;
FIG. 9 is a schematic view of a partial cross-sectional structure of a collector of the present invention;
FIG. 10 is an enlarged view of the structure at C in FIG. 9;
FIG. 11 is an enlarged view of the structure at D in FIG. 9;
FIG. 12 is a schematic view of a blanking structure of an embodiment of the scrap iron recycling device for the workshop according to the invention;
the device comprises a fixed plate 1, a C-shaped plate 11, a moving wheel 12, a disc 13, a fixed rod 14, an arc-shaped baffle 15, an arc-shaped electromagnet 16, a top block 17, a first fixed block 18, a conductive pin 2, a conductive sheet 21, an unmanned vehicle main body 3, a box body 4, a battery pack 41, a controller 42, a box door 43, a sliding block 5, a spring 51, a connecting block 52, a second fixed block 53, a sliding groove 54, a groove 55, a rope pulling groove 56, a rope pulling 57, a sliding plate 6, a screw 61, a handle 62, a moving groove 63 and a collecting box 7.
Detailed Description
In order that those skilled in the art can better understand the present invention, the following technical solutions are further described with reference to the accompanying drawings and examples.
As shown in figures 1-12, the scrap iron recycling device for a workshop comprises a power mechanism and a collecting mechanism, wherein the collecting mechanism comprises two fixed plates 1, a C-shaped plate 11, two moving wheels 12, two circular discs 13, three fixed rods 14, three arc-shaped baffles 15, three arc-shaped electromagnets 16, six top blocks 17 and two first fixed blocks 18, the two fixed plates 1 are fixedly connected through the C-shaped plate 11, the C-shaped plate 11 is connected with the power mechanism, the two moving wheels 12 are rotatably assembled at one sides of the two fixed plates 1 far away from each other through rotating shafts, the two circular discs 13 are respectively rotatably assembled at the opposite sides of the two fixed plates 1, the rotating shafts of the two moving wheels 12 respectively penetrate through the two fixed plates 1 to be in transmission connection with the two circular discs 13, the three fixed rods 14 are fixedly connected between the two circular discs 13, the three fixed rods 14 are uniformly distributed on the circumference, one end of each arc-shaped baffle 15 is respectively and elastically hinged with the three fixed rods 14, and the other end and the inboard butt of adjacent dead lever 14, three arc electro-magnet 16 is installed respectively on three cowl 15 surface, two double-phase a set of six kicking blocks 17 is installed respectively at both ends about three cowl 15, every kicking block 17 of group all is located and keeps away from cowl 15 pin joint one side, two first fixed blocks 18 are fixed respectively at two fixed plate 1 upsides, and with kicking block 17 phase-match, both ends are kept away from pin joint one side and all are equipped with electrically conductive foot 2 about three cowl 15, two electrically conductive foot 2 and the 16 electric connection of corresponding arc electro-magnet of same cowl 15, two discs 13 all are equipped with and electrically conductive foot 2 assorted conducting strip 21.
In an initial state, because one end of each of the three arc-shaped baffles 15 is elastically hinged with each of the three fixing rods 14, the other end of each of the three arc-shaped baffles 15 is pushed to abut against the inner side of the adjacent fixing rod 14 under the action of elastic force, so that the three arc-shaped baffles 15 and the three fixing rods 14 form a barrel, and the two conductive pins 2 of the same arc-shaped baffle 15 are in contact with the corresponding conductive sheets 21, so that the arc-shaped electromagnet 16 can be electrified to generate magnetic force;
the working personnel start the power mechanism and the collecting mechanism, the power mechanism drives the collecting mechanism to move at a low speed to clean and collect scrap iron on the ground of a workshop, when the collecting mechanism works, the fixed plate 1 and the C-shaped plate 11 are fixed to be incapable of rotating, the two moving wheels 12 are contacted with the ground to rotate along with the power mechanism, as the rotating shafts of the two moving wheels 12 respectively penetrate through the two fixed plates 1 to be in transmission connection with the two disks 13, the two disks 13 start to rotate, the two disks 13 rotate to drive the three fixed rods 14 and the three arc-shaped baffles 15 to rotate, and the three arc-shaped electromagnets 16 arranged on the surfaces of the three arc-shaped baffles 15 rotate;
when the arc-shaped baffle plate 15 rotates, the conducting pins 2 on the arc-shaped baffle plate 15 and the conducting plates 21 on the fixed plate 1 rotate synchronously, the conducting plates 21 and the conducting pins 2 are in a relatively static state, so that under the condition that the conducting pins 2 and the conducting plates 21 are always contacted, the arc-shaped electromagnets 16 can be electrified to generate magnetic force, when one of the arc-shaped electromagnets 16 rotates to the lower side to be close to the workshop ground, scrap iron on the workshop ground can be adsorbed on the arc-shaped electromagnets 16, when the arc-shaped electromagnets 16 continuously rotate to the upper side, the bottom of the top block 17 on the arc-shaped baffle plate 15 provided with the arc-shaped electromagnets 16 is firstly contacted with the end part of the first fixed block 18, because the top block 17 is in a ladder shape extending from two sides of the bottom to the middle part, when the arc-shaped baffle plate 15 continuously rotates, the first fixed block 18 extrudes the inclined surface of, when the arc-shaped baffle 15 rotates downwards, an opening is formed between the arc-shaped baffle 15 and the adjacent fixing rod 14, meanwhile, the conducting pin 2 on the arc-shaped baffle 15 gradually moves away from the conducting strip 21, when the arc-shaped baffle 15 continues to rotate to enable the conducting pin 2 to completely move away from the conducting strip 21, the arc-shaped electromagnet 16 on the arc-shaped baffle 15 is powered off and does not generate magnetic force, so that no adsorption force is generated on scrap iron, at the moment, one end of the arc-shaped baffle 15, which is far away from a hinge point, faces the inner side of the barrel under the pushing of the first fixing block 18, the scrap iron on the arc-shaped electromagnet 16 automatically falls into the barrel consisting of the three arc-shaped baffles 15 through the opening under the action of gravity, when the top of the jacking block 17 gradually moves away from the first fixing block 18, the arc-shaped baffle 15 automatically resets through self elasticity, so that the conducting pin 2 is in contact with the conducting strip 21, and the arc-shaped electromagnet 16 is powered on to generate magnetic force, undoubtedly, the iron chips on the ground can be adsorbed when the iron chips continue to rotate to one side of the ground; when the top block 17 is completely moved away from the first fixing block 18, the end part of the arc-shaped baffle 15 is continuously abutted with the adjacent fixing rod 14, so that scrap iron can be stored in a barrel formed by the three arc-shaped baffles 15;
like this when disc 13 continuously rotates, when an arc electro-magnet 16 moved the upside, the inclined plane and the contact of first fixed block 18 of kicking block 17 of this cowl 15, thereby promote this cowl 15 and rotate downwards along the pin joint and form the opening, conducting pin 2 can move away conducting strip 21 simultaneously, make the outage of arc electro-magnet 16 on this cowl 15, thereby lie in the iron fillings on arc electro-magnet 16 and drop to the cask that three cowl 15 constitutes under the effect of self gravity, can last collect the iron fillings, avoid the 16 surperficial too much iron fillings of attaching to of arc electro-magnet, and the working performance of the device is improved.
According to the invention, the three arc-shaped baffles and the three fixing rods are combined into a barrel, the iron filings on the ground are adsorbed by the arc-shaped electromagnet on the arc-shaped baffles, when the arc-shaped baffles rotate to the upper side to enable the first fixing block to push the ejector block, the arc-shaped baffles rotate downwards to form an opening, and meanwhile, the arc-shaped electromagnet is powered off and does not generate magnetic force, so that the iron filings on the arc-shaped electromagnet fall into the barrel through the opening under the action of gravity to be collected.
Referring to fig. 1, the power mechanism is an unmanned vehicle main body 3, a C-shaped plate 11 is connected with the rear side of the unmanned vehicle main body 3, and a driving wheel of the unmanned vehicle main body 3 is in transmission connection with two moving wheels 12 through a transmission belt; therefore, the unmanned vehicle main body 3 drives the collecting mechanism to move slowly in the workshop, scrap iron on the ground of the workshop can be collected automatically without manual collection, the driving wheel of the unmanned vehicle main body 3 is in transmission connection with the two moving wheels 12 through the driving belt, normal rotation of the moving wheels 12 can be ensured, and the driving device is used for continuously collecting the scrap iron; in fact, other power mechanisms can be used to drive the collecting mechanism to move according to specific situations.
Referring to fig. 2-3, an electric power assembly is disposed on the upper side of the C-shaped plate 11, the electric power assembly includes a box 4, a battery pack 41, and a controller 42, the box 4 is connected to the C-shaped plate 11, the battery pack 41 and the controller 42 are both disposed in the box 4, the battery pack 41 is electrically connected to the controller 42, and the controller 42 is electrically connected to the conductive sheet 21; the upper side of the box body 4 is rotatably connected with a box door 43, the box door 43 is provided with a sealing strip, and the box body 4 is provided with a sealing groove matched with the sealing strip;
when the collecting mechanism works, the battery pack 41 is controlled by the controller 42 to supply power to the conducting strips 21, so that the electromagnet can be electrified to generate magnetic force when the conducting pins 2 are contacted with the conducting strips 21; in box 4 was all located to group battery 41 and controller 42, can play the guard action to box 4 rotates and is connected with chamber door 43, conveniently overhauls group battery 41 and controller 42 in the box 4, simultaneously through set up the sealing strip at chamber door 43, box 4 sets up with sealing strip assorted seal groove, when chamber door 43 is closed, the sealing strip enters into the seal groove in, improves box 4's sealed effect.
Referring to fig. 5 and 9-12, the lower sides of the two fixing plates 1 are respectively provided with a discharging assembly, the discharging assembly comprises a sliding block 5, a spring 51, a connecting block 52 and a second fixing block 53, the lower side of the fixing plate 1 is provided with a sliding groove 54, the sliding block 5 is slidably assembled in the sliding groove 54, the spring 51 is positioned between the upper side of the sliding block 5 and the sliding groove 54, one end of the connecting block 52 is connected with the sliding block 5, the other end of the connecting block 52 is connected with the second fixing block 53, the sliding groove 54 is provided with a groove 55 matched with the connecting block 52, and the second fixing block 53 is matched with the top block 17; pull rope grooves 56 are formed between the two fixed plates 1 and the C-shaped plate 11, pull ropes 57 are arranged in the two pull rope grooves 56, one ends of the two pull ropes 57 are respectively connected with the upper sides of the two sliding blocks 5, and the other ends of the two pull ropes 57 are jointly connected with operating parts; the operating part comprises a sliding plate 6, a screw rod 61 and a handle 62, the C-shaped plate 11 is provided with a moving groove 63, the sliding plate 6 is assembled in the moving groove 63 in a sliding manner, the lower end of the sliding plate 6 is connected with two pull ropes 57, the screw rod 61 is assembled on the upper side of the sliding plate 6 in a rotating manner, the upper side of the moving groove 63 is provided with a threaded through hole, the upper side of the screw rod 61 extends out of the threaded through hole and is in threaded connection with the threaded through hole, and the handle 62 is fixedly arranged at the upper end of the screw rod 61; an anti-slip sleeve is arranged on the outer side of the handle 62;
when the power mechanism drives the collecting mechanism to move to the blanking area, the blanking area is a strip-shaped collecting box 7, the controller 42 cuts off the battery pack 41 to supply power to the conducting strip 21, even if the conducting strip 2 is contacted with the conducting strip 21, the arc-shaped electromagnet 16 cannot be electrified to generate magnetic force, at the moment, scrap iron on the surface of the arc-shaped electromagnet 16 directly falls into the collecting box 7, the scrap iron in the barrel is always positioned at the lower side of the barrel under the action of gravity, a worker can rotate the handle 62 to drive the screw 61 to rotate, because the screw 61 is in threaded connection with the threaded through hole at the upper side of the moving groove 63, the screw 61 can move upwards or downwards when rotating, the worker rotates the handle 62 to drive the screw 61 to move upwards, so as to drive the sliding plate 6 at the lower side to move upwards in the moving groove 63, thereby driving the two pull ropes 57 to move upwards, because the other end of the pull rope 57 is connected with the upper ends of the two sliding blocks 5, therefore, when the sliding plate 6 drives the two pull ropes 57 to move upwards, the two pull ropes 57 drive the two sliding blocks 5 to move upwards in the sliding groove 54, the spring 51 is compressed, the sliding blocks 5 drive the second fixed block 53 to move upwards through the connecting block 52, when the sliding plate 6 moves to the uppermost side of the moving groove 63, the distance from the second fixed block 53 to the circle center of the disc 13 is equal to the distance from the first fixed block 18 to the circle center of the disc 13, the shape and the size of the second fixed block 53 are the same as those of the first fixed block 18, in this way, the power mechanism is started to enable the collecting mechanism to reciprocate back and forth at a slow speed in the blanking area, when one arc-shaped baffle plate 15 moves to the lower side, the top block 17 of the arc-shaped baffle plate 15 can contact with the second fixed block 53, the second fixed block 53 contacts with the inclined surface of the top block 17 to push the arc-shaped baffle plate 15 to rotate upwards along the hinge point, an opening is formed, and at the moment, the iron filings in the barrel fall into the collecting box 7 through the opening under the action of gravity, thereby at collection 7 upside reciprocating motion front and back of box, can make the iron fillings of storage in the cask, it is whole to drop to collecting in the box 7, thereby shift out the iron fillings in the cask, the unloading finishes the back, work is rotated handle 62 and is driven screw rod 61 downstream, thereby drive slide 6 downstream in motion groove 63, spring 51's the elasticity that resets this moment will promote slider 5 to the motion, thereby drive second fixed block 53 downstream through connecting block 52, when slide 6 is located the downside of motion groove 63, slider 5 also will be located the downside of spout 54, then kicking block 17 can not contact with second fixed block 53, just the unable opening that produces of cask downside, it can continue to clear up workshop ground to collect the mechanism.
Referring to fig. 8, the first fixed block 18 and the second fixed block 53 are symmetrically distributed along the circular central axis of the disc 13, and the included angle between the first fixed block 18 and the horizontal plane and the included angle between the second fixed block 53 and the horizontal plane are greater than 30 degrees and smaller than 60 degrees; like this first fixed block 18's position design, when the tip of kicking block 17 and first fixed block 18's tip butt, can guarantee to be in comparatively horizontally state with the dead lever 14 of this arc dog 15 articulated and with the dead lever 14 both of this arc dog 15 tip butt, thereby when guaranteeing the opening orientation top that forms, make the iron fillings that are located near this arc dog 15 pin joint one side also can drop to the cask in, the position design of second fixed block 53 makes the unloading more complete in the same way.
The foregoing embodiments are merely illustrative of the principles of the present invention and its efficacy, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
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