JP2008302429A - Compressor for fine metal scrap - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and inexpensive fume compressor where, after the fume of a metal oxide generated upon the heat cutting of a metal is collected, this is solidified. <P>SOLUTION: A pressure ram inserted into a compression cylinder is moved with a ball screw reciprocated by a reducer-fitted motor. A guide body for moving the pressure ram screwed with the ball screw is provided with a rod having a bottomed hole and extending toward the compression cylinder side and a recessed part, and guides an outer diameter part with a guide tube, wherein the bottomed hole is used as an insertion part of the ball screw and the cylindrical recessed part is used as a storage part of a ball nut. The ball screw is a rolled screw thread, receives a load in the axial direction by a thrust bearing at the terminal, and connects the terminal to the hollow output axis of the reducer-fitted motor. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to fine metal oxides generated when a metal is thermally cut by a laser processing machine, a plasma processing machine, etc., chips and grinding debris discharged into a coolant tank of a machine tool, and a fine wire cutting machine. The present invention relates to a compression device for solidifying waste made of fine metal or metal oxide such as engraved used wire (collectively referred to as “fine metal scrap” in this application).

  Metal oxide fine powdery waste called fumes generated when a metal is thermally cut by a laser processing machine or the like is collected by a dust collector attached to the processing machine. Sludge such as chips and grinding debris generated when cutting or grinding metal is discharged out of the machine together with the coolant, filtered and collected. In order to reuse such fine metal scrap, the metal scrap must be transported from a metal processing factory where the scrap is generated to a refinery such as a steel mill. Fume that is fine metal scrap, particularly metal oxide powder, has a large volume (apparent specific gravity is small), and therefore it is costly to store and transport the fumes collected by the dust collector. Therefore, a compression apparatus is practically used in which the collected fumes are compressed into a short cylindrical solid by compressing them with a pressure ram or pressure piston that advances and retreats in the cylinder.

  For example, in Patent Document 1, grinding sludge is introduced into a compression cylinder by a screw conveyor from a hopper, and compressed between a vertically movable shutter provided on an end surface of the compression cylinder and a pressure piston that advances and retreats in the compression cylinder. An apparatus for producing a solidified product is shown. In general, this type of compression device has a structure in which a compression cylinder is arranged vertically and a pressure piston is moved downward to compress grinding sludge. However, the compression device described in Patent Document 1 is used. Is a structure having a horizontal compression cylinder.

  In addition, a hydraulic cylinder is usually used as a driving device for the pressurizing piston. However, Patent Document 2 discloses that the pressurizing piston is moved forward and backward by converting the forward / reverse rotation of the electric motor into a reciprocating motion using a ball screw device. An apparatus for compressing ground sludge having a structure to be shown is shown. The compression device described in Patent Document 2 uses a plurality of ball screws to advance and retract the pressure piston.

In the compression device disclosed in Patent Document 1, the pressure piston is controlled by a rotation speed sensor that detects the rotation speed of the inverter motor and an oil pressure detected by a pressure sensor provided in a hydraulic flow path from the pump to the hydraulic cylinder. The speed and compression force are feedback controlled. In the compression device disclosed in Patent Document 2, the speed and compression force of the pressure piston are controlled by providing an encoder for detecting the rotation of a servo motor that drives the ball screw and a pressure detection means such as a load cell.
Japanese Patent Laid-Open No. 2003-311488 JP 2001-315000 A

  The laser processing machine is provided with a fume dust collector. The fume collected by the dust collector is stored in a bag placed under the butterfly valve provided at the bottom of the storage reservoir, and transported to a recycling plant by a truck of an industrial waste company. However, since this method is bulky for storage and transportation, there are many processing machines that are further provided with a compression device in the dust collector and discharge the collected fumes as a solidified product whose volume is compressed to about 1/10.

  However, most of existing laser processing machines are equipped with a dust collector but not a compression device. For this reason, it is costly to store and transport the generated fumes, and problems that are not properly processed are likely to occur. In addition, the conventionally provided fume compression apparatus requires a large installation space, and an existing laser processing machine cannot secure a space necessary for installation around it, and thus cannot be installed in many cases.

  Therefore, the present invention provides a small and inexpensive device for solidifying fumes discharged from a dust collector of an existing laser processing machine, thereby enabling economical reprocessing of fine metal debris such as fumes. It is an issue.

  The apparatus for compressing fine metal debris according to the invention of this application includes a pressure ram 18 that introduces fine metal debris into the cylinder hole 6 and advances and retreats in the cylinder hole, and a shutter 13 that closes the tip of the cylinder hole. And a guide cylinder 3 having a cylindrical hole concentric with the hole on the proximal end side of the cylinder hole 6 and having a diameter larger than that of the hole, A guide body 20 guided by the tube hole of the guide cylinder. The guide body 20 includes a cylindrical recess 23 having an opening on the side opposite to the cylinder hole, a rod 21 integrally extending toward the cylinder hole 6, and the rod. Provided with a bottomed hole 33 having a base end opened in the cylindrical recess 23, and a ball screw 32 reciprocatingly rotated by the motor 2 with a speed reducer has the tip thereof at the bottomed hole. In the state inserted in 33, it is arrange | positioned at the axial center of the said cylinder hole Are both compression apparatus of the fine metal scrap ball nut 28 is fixed to the guide body 20 in a state of being housed in a cylindrical recess 23 which is screwed to the ball screw.

  The apparatus for compressing fine metal scrap according to claim 1 of the present application is characterized in that the tip of the rod 21 is inserted into the cylinder hole 6 to form a pressure ram 18. is there.

  Further, in the apparatus for compressing fine metal scrap according to the second aspect of the present invention, the proximal end of the pressure ram 18 is connected to the distal end of the rod 21, and the rod 21 is the partition wall 3 a at the distal end of the guide cylinder 3. A bellows 50 for preventing fine metal powder from entering the penetrating portion is provided at a portion penetrating the penetrating portion.

  Fine metal scraps are fine powder metal oxides called fumes collected by a dust collector attached to a laser processing machine or a plasma processing machine, or grinding sludge collected by a chip conveyor from a coolant tank of a grinding machine. Or a short cut piece of used wire discharged from a wire electric discharge machine. The compression device according to the invention of this application is particularly suitable for solidifying the fumes after collecting the metal oxide fumes generated during the thermal cutting of the metal.

  The apparatus for compressing fine metal scrap according to the invention of claim 3 of this application is the apparatus for compressing fine metal scrap provided with the means according to claim 1 or 2, wherein the motor 2 with a speed reducer includes a hollow output shaft 36, The one ball screw 32 is a rolled screw in which a cylindrical processing portion 34 at the base end is inserted into the hollow output shaft 36. With this structure, an inexpensive rolling screw can be used as the ball screw 32 to receive a large axial force associated with the compression of fine metal scrap, and the large torque of the motor 2 with a speed reducer can be compactly applied to the rolling screw. Can be transmitted by a simple mechanism. This structure is advantageous for reducing the size of the compact metal scrap compression device at low cost.

  With the above structure, in the fine metal scrap compression device that reciprocates the pressure ram in the horizontal direction, the device can be made compact, and the guide structure of the pressure ram 18 can be made simple and compact. A compact metal dust compacting device with a small installation space can be obtained. Note that the compression device with a structure that moves the pressure ram up and down cannot be installed under the dust collector attached to the existing laser processing machine or plasma processing machine due to the high hopper height, and the metal in the cylinder hole There are disadvantages such as requiring an accessory device such as a screw conveyor for the introduction of scraps.

  The structure of claim 1 in which the tip end of the rod 21 is the pressure ram 18 can make the apparatus smaller than the structure of claim 2. However, in the structure of claim 1, the diameter of the ball screw 32 is restricted due to the restriction of the diameter of the pressure ram 18, and the strength of the screwed portion with the ball nut 28 is insufficient when an inexpensive rolling screw is used. Cases can occur. In such a case, a plurality of ball nuts 28 may be provided in series so as to withstand the necessary compressive force. In this case, the plurality of ball nuts 28 a and 28 b are fixed to the guide piston 22 in a state of being fastened to each other in the axial direction, and are screwed into the single ball screw 32. The plurality of ball nuts 28a, 28b are fastened in the axial direction with a spacer 30 inserted between them, so that their mutual intervals are defined so that their thread grooves are on the same spiral. Yes. When a plurality of ball nuts 28 are provided, at least one of the plurality of ball nuts is housed and mounted in the cylindrical recess 23 of the guide body.

  When a rolling screw is used as the ball screw 32, a cylindrical machining portion 34 having a diameter smaller than the root diameter of the screw is machined at the base end and connected to the hollow output shaft 36 of the motor 2 with a reduction gear. When a small-diameter rolled screw is used, the threaded portion 35 and the rotational force that transmit the axial compressive force to the cylindrical processed portion 34 at the base end of the ball screw 32 are used as the structure of the connecting portion with the motor 2 with a reduction gear. A flanged sleeve 31 fixed to the ball screw is provided with a torque pin 37 in a direction perpendicular to the shaft for transmitting the flange, and the flanged sleeve is fitted into the hollow output shaft 36 and fixed to the framed sleeve and the gantry. A structure is employed in which a thrust bearing 43 that receives a compressive force is interposed between the support plate (rear support plate in the example in the figure) 4b.

  If fine fumes generated from a laser processing machine or a plasma processing machine enter the inside of the guide cylinder 3, the sliding part may be worn out or the sliding resistance of the guide body 20 may be increased. In order to avoid this problem, a part of the peripheral surface is notched so that the step surface of the guide piston 22 has a D shape, or an axial groove is provided in the peripheral surface, so that the left and right chambers of the guide histone 22 are provided. Adopt a communication structure. With this structure, it is possible to avoid sucking the fumes into the guide tube 3 when the guide body 20 moves backward, and to prevent the fumes from entering the guide tube 3.

  When it is desired to completely prevent the intrusion of the fumes into the guide cylinder 3, it is certain that the fine belly metal debris is prevented from entering the guide cylinder 3 by the bellows 50 or the like. The structure of claim 2 in which the base end of the pressure ram 18 is connected to the tip of the rod 21 eliminates the restriction of the diameter of the rod 21, so that the diameter of the ball screw 32 can be increased, and an inexpensive rolling screw is provided. Can be used, the structure of the connecting portion between the ball screw 32 and the motor 2 with a speed reducer can be simplified, and the driving force of the motor 2 with a speed reducer can be transmitted to the guide body 20 with one ball nut 28. become.

  The apparatus for compressing fine metal scrap according to the invention of claim 5 of the present application is the compact metal scrap compressing apparatus provided with the means according to claim 1, 2, 3 or 4, wherein the motor 2 with speed reducer is an inverter. The motor is characterized in that the pressurizing force required to solidify the fine metal scrap is set by a motor current value set in a controller attached to the motor 2 with speed reducer.

  With the above structure, a special sensor for detecting the applied pressure becomes unnecessary. And only by providing the sensors 26a and 26b which detect the forward end and the backward end of the pressurization ram 18, a compression apparatus for obtaining a solidified product obtained by compressing fine metal scraps into a predetermined particle size can be provided at low cost.

  1 to 5 are views showing an example of the first embodiment of the present invention. In the figure, 1 is a gantry. The gantry 1 shown in the figure is trapezoidal in cross section, and has a rectangular shape with elongated planes and side surfaces. A control device is installed inside the gantry 1. This control device is provided with a control device that controls an inverter motor of a motor 2 with a speed reducer, which will be described later. This controller controls the torque of the motor, and hence the pressurizing force of the pressurizing ram 18 described later, by detecting the current value of the inverter motor 2.

  Reference numeral 3 denotes a guide cylinder fixed on the gantry 1. The guide cylinder 3 is installed by fixing flanges provided at both ends to front and rear support plates 4 a and 4 b erected on the gantry 1 with bolts.

  5 is a compression cylinder. The compression cylinder 5 shown in the figure has a rectangular shape whose outer cross section is wide in the horizontal direction, and a cylinder hole 6 is provided at the center of the cross section. The base end is on the side opposite to the guide cylinder of the front support plate 4a, and the axis of the cylinder hole is guided. It is provided so as to be aligned with the axial center of the cylinder hole of the cylinder 3 and fixed with bolts. The front support plate 4a is provided with a through hole having the same diameter as the cylinder hole 6 at the center and having the same axis. Therefore, the cylinder hole 6 of the compression cylinder communicates with the tip of the cylinder hole of the guide cylinder 3.

  The compression cylinder 5 has a rectangular opening 8 in a plan view connected to the cylinder hole 6 on the upper surface on the base end side, and a hopper 9 for introducing fine metal debris into the opening is provided above the opening. Yes. A portion on the tip side of the opening 8 of the cylinder hole 6 is a compression portion 10 that compresses the fine metal scrap introduced from the hopper 9. The hopper 9 is mounted with its lower end periphery fixed to the upper surface of the compression cylinder 5 having a rectangular cross section with a bolt. The hopper 9 has a circular shape at the top, and the shape of the lower end portion connected to the opening 8 is a rectangular shape that matches the size of the opening.

  Reference numeral 11 denotes a discharge device fixed to the tip of the compression cylinder 5. The discharge device 11 includes a shutter 13 that moves up and down by an air cylinder 12. The shutter 13 closes the tip of the cylinder hole 6 at the lowered position shown in the figure, and when the shutter 13 is raised, the cylinder hole 6 and the discharge port 14 opened below the shutter 13 are communicated with each other.

  The frame 15 of the discharge device is fixed to the front end of the compression cylinder 5 with a bolt. The discharge device 11 includes a back plate 16 that also serves as a lifting guide for the shutter on the side of the anti-compression cylinder of the shutter 13, and the air cylinder 12 is fixed to the upper end of the back plate 16 via a bracket 17. . The back plate 16 is integrally provided with a side plate that guides the side surfaces of the shutter 13 (the front side and the back side of the paper in FIG. 1), and the end plate is pressed against the front end surface of the compression cylinder 5 with the bolt described above. It is integrated with the compression cylinder 5. The shutter 13 is guided up and down by a planar rectangular through-hole surrounded by the back plate 16, side plates on both sides thereof, and the front end surface of the compression cylinder 5.

  Reference numeral 20 denotes a guide body (a piston with a rod). FIG. 1 shows the retracted state of the guide body 20, and FIG. 2 shows the advanced state. The guide body 20 includes a small-diameter rod 21 whose tip is inserted into the cylinder hole 6 to form a pressurizing ram 18 that compresses fine metal scraps, and a large-diameter guide guided by the cylindrical hole of the guide cylinder 3. The piston 22 is provided integrally. The guide piston 22 is formed with a large-diameter cylindrical recess 23 having an opening on the side opposite to the rod at its axis, and the rod 21 has a small-diameter bottomed hole 33 whose base end opens on the bottom surface of the cylindrical recess 23. They are provided on the same axis. A sliding key 24 is fixed to one place of the outer diameter of the guide piston 22, and the guide body 20 is rotated by being guided by an axial key groove provided on the inner periphery of the guide cylinder 3. It is prevented.

  With this structure, in the compression device that reciprocates the pressure ram 18 in the horizontal direction, the pressure ram 18 can be guided at a long fulcrum distance (distance between the front end of the pressure ram and the rear end of the guide piston). At the same time, the guide structure can be made compact, the reciprocating motion of the pressure ram 18 can be made smooth and the frictional resistance can be reduced, so that a compact and low-power-consumption compressor can be obtained.

  Sensors (limit switches) 26 a and 26 b for detecting the forward end and the backward end of the guide body 20 are attached to the guide cylinder 3. The position of the forward end sensor 26a is such that when fine metal dust is introduced into the portion where the opening 8 of the cylinder hole 6 is provided without a gap, the volume of the fine metal dust between the pressurization ram 18 and the shutter 13 is 1. It is a position to compress to a length of / 10. In the illustrated apparatus, the axial length of the opening 8 is 150 mm, and the guide piston 22 is detected when the distance between the front end of the pressure ram 18 and the surface of the shutter 13 facing the pressure ram reaches 15 mm. An end sensor 26a is attached. The backward end sensor 26 b is installed at a position where the guide piston 22 is detected at the backward end of the pressure ram 18. The retracted end is set at a position where the pressurization ram 18 opens the entire length of the opening 8 and the front end of the pressurization ram 18 does not come off the base end of the cylinder hole 6.

  Two hooked ball nuts 28 a and 28 b are fastened to the base end of the guide piston 22 with bolts 29. The two nuts 28a and 28b with hooks are fixed to each other with a spacer 30 between the two hooks so that the spiral grooves of both nuts are positioned on the same spiral. . This ball nut 28 with hooks is accommodated in the cylindrical recess 23 of the guide piston leaving a hook portion to shorten the axial length of the apparatus. In the structure shown in the figure, two ball nuts are arranged in series, and one of them is accommodated in the cylindrical recess 23 of the guide piston.

  A ball screw 32 having a hooked sleeve 31 attached to the base end is screwed onto the hooked ball nuts 28a and 28b in a state where the tip end side is inserted into the bottomed hole 33 of the rod. The guide body 20 has such a length that the tip of the rod 21 cannot be removed from the cylinder hole 6 in the retracted state of FIG. The ball screw 32 is inserted into a long bottomed hole 33 provided in the rod with a length corresponding to the stroke of the guide body 20 in the retracted state of the guide body 20. This structure is effective for shortening the length of the compression device.

  The ball screw 32 shown in the figure is a rolled screw. In the structure in which the rod 21 of the guide body is the pressure ram 18, the diameter of the rod 21, and hence the diameter of the bottomed hole 33 provided in the rod 21, is limited, and the ball screw 32 cannot be made thick. Rolled screws are much cheaper than cutting screws, but since the screw is formed over the entire surface, if a stepped portion having an area necessary for receiving a compression reaction force is formed at the base end, a ball screw is formed. The base cylindrical processing part 34 becomes thin, and the strength necessary for transmitting torque from the motor 2 with a reduction gear cannot be obtained. Therefore, in the apparatus shown in FIGS. 1 to 5, the flanged sleeve 31 is fitted to the cylindrical processing portion 34 formed at the base end of the ball screw 32, and the axial compression force is applied to the cylindrical processing portion by the triangular screw portion 35. A structure is employed in which the torque transmitted to the sleeve 31 with the flange and from the hollow output shaft 36 of the motor 2 with the speed reducer to the sleeve 31 with the flange is transmitted to the ball screw 32 with the torque pin 37.

  That is, a fitting portion 38 and a triangular screw portion 35 having a substantially screw bottom diameter are formed in a cylindrical processing portion 34 at the base end portion of the ball screw 32, and the fitting portion 38 is fitted to the flanged sleeve 31 to form a triangular screw portion. (The portion where the thread forms a triangular stepped surface screw) 35 is screwed with a female screw formed on the inner diameter of the flanged sleeve 31, and the flanged sleeve 31 is fixed to the base end of the ball screw 32. The axial force acting on the ball screw 32 is transmitted to the flanged sleeve 31 by screwing the triangular thread portion 35 and the internal thread of the flanged sleeve 31. On the other hand, a torque pin 37 in a direction perpendicular to the axis is inserted between the base end of the triangular screw portion 35 of the ball screw 32 further extended and the flanged sleeve 31, and the rotational force of the flanged sleeve 31 is applied to the torque pin 37. Is transmitted to the ball screw 32. The triangular screw portion 35 and the torque pin 37 are arranged at an axial interval such that local deformation around the torque pin 37 that occurs during torque transmission does not adversely affect the threaded portion of the triangular screw 35. .

  The motor 2 with a reduction gear in the figure has a structure in which the rotation of the motor is decelerated by a hypoid gear and is transmitted to an output shaft (hollow output shaft) 36 having a through hole in the center. In this structure, a radial load can be received by a bearing that supports the hollow output shaft 36.

  The motor 2 with a reduction gear is mounted in a state of being sandwiched between a rear support plate 4b that supports the proximal end of the guide cylinder 3 and an end plate 41 fastened to the rear support plate with fastening bolts 40. The rear support plate 4b and the end plate 41 sandwich the reduction gear casing of the motor with a reduction gear at both axial ends of the hollow output shaft 36. A flanged sleeve 31 that is fixed to the base end of the ball screw through the center hole provided in the rear support plate 4 b and the end plate 41 is fitted in the through hole of the hollow output shaft 36.

  A first thrust bearing 43 is interposed between the flange 42 at the front end of the flanged sleeve 31 and the rear support plate 4b. A second thrust bearing 46 is interposed between the presser plate 45 and the end plate 41 whose axial position is defined by a nut 44 screwed into the tip of the flanged sleeve 31. That is, the flanged sleeve 31 is supported in the radial direction by being fitted into the through hole of the hollow output shaft 36, and is attached with two thrust bearings 43, 46 defining the axial direction position. The rotation of the hollow output shaft 36 is transmitted to the flanged sleeve 31 by a key 47 provided between the hollow output shaft 36 and the flanged sleeve 31.

  FIG. 6 is a sectional side view showing an example of the second embodiment of the present invention. In FIG. 6, the same members as those described in the first embodiment shown in FIGS. 1 to 5 are denoted by the same reference numerals and the description thereof is omitted, and only portions different in structure from the first embodiment are described. To do.

  In the second embodiment, a connecting cylinder 7 is interposed between the compression cylinder 5 and the guide cylinder 3, and the tip of the rod 21 of the guide body 20 in the guide cylinder 3 is connected to the compression cylinder 5. The base end of the pressurizing ram 18 inserted in is connected at the connecting cylinder 7 portion. That is, the base end flange 5 a welded to the base end of the compression cylinder 5 is bolted to the tip of the connecting cylinder 7, and the partition flange 3 a welded to the base end of the connecting cylinder 7 is bolted to the tip of the guide cylinder 3. . The diameter of the rod 21 is larger than the diameter of the pressure ram 18, and the proximal end of the pressure ram 18 is inserted into the axial fitting hole at the distal end of the rod 21 penetrating the distal end side partition 3 a of the guide cylinder. The pressure ram 18 and the rod 21 are connected by inserting the pin 18a in the direction perpendicular to the axis into the insertion portion.

  And between the support disc 51 provided in the portion of the base end portion of the pressure ram 18 that is not inserted into the compression cylinder 5 and the partition wall 3a, the tip of the rod 21 and the base end of the pressure ram 18 are sealed. A bellows 50 is mounted. The bellows shields the portion where the rod 21 penetrates the partition wall 3a, and expands and contracts as the pressurizing ram 18 moves back and forth. The connecting cylinder 7 has an opening in the lower part, and the fine metal scraps flowing into the connecting cylinder are discharged from this opening.

  The shutter 13 according to the second embodiment has a structure in which the shutter 13 is moved up and down by being screwed into a vertical screw 54 that is rotationally driven by a motor 53.

  In the structure of the first embodiment in which the rod 21 of the guide body is the pressure ram 18, the diameter of the rod 21, and hence the diameter of the bottomed hole 33 provided in the rod 21, is limited, and the diameter of the ball screw 32 is limited ( Increasing the diameter of the pressure ram increases the pressure and the diameter of the ball screw. In the structure of the second embodiment, the diameter of the rod 21 can be made larger than the diameter of the pressurizing ram 18, so that the ball screw 32 having a necessary strength (thickness) can be used. Therefore, the ball screw 32 is a rolling screw having a thickness capable of transmitting a pressing force with one ball nut 28, and only one ball nut 28 is attached to the guide piston 22. Further, since a thrust receiving surface having a sufficient area can be formed at the base end of the ball screw, the cylindrical processed portion 34 at the base end of the ball screw is directly inserted into the hollow output shaft of the motor 2 with a speed reducer, and the cylindrical processed portion 34 A thrust bearing 43 is interposed between the step surface formed between the rolling screw portion and the rear support plate 4b supporting the guide tube.

  Next, the operation of the apparatus having the above structure will be described. 1 and 6, the fine metal dust thrown into the hopper 9 flows into the cylinder hole 6 from the opening 8 in a state in which the guide body 20 shown in FIGS. 1 and 6 is retracted and the shutter 13 closes the tip of the cylinder hole 6. . In this state, the guide body 20 moves forward by rotating the motor 2 with a speed reducer forward, and the pressurizing ram 18 pushes and moves the fine metal scrap introduced into the cylinder hole 6 toward the shutter 13. Compress with. The compressive force is detected by the current value of the motor 2 with speed reducer, and the backward end and the specified forward end of the guide body 20 are detected by limit switches 26 a and 26 b provided on the guide cylinder 3.

  After the guide body 20 is moved forward by rotating the motor 2 forward, and before the guide body 20 is detected by the advance end sensor 26a, the motor current value reaches a limit value corresponding to the set compression force. Since it is determined that the fine metal scrap of a predetermined amount or more has been compressed, the guide body 20 is slightly retracted to release the pressure, and then the shutter 13 is raised, and then the guide body 20 is moved to the mechanical advance end ( For example, the guide piston 22 is advanced to a position where it abuts against the front support plate 4a (see FIG. 2), and the compressed metal scrap is dropped and discharged from the discharge port 14.

  On the other hand, when the guide body 20 is detected by the forward end sensor 26a before the motor current value (compression force of the pressure ram) reaches the limit value, a predetermined amount of metal debris is not introduced into the cylinder hole 6. Therefore, the motor 2 is reversely rotated without raising the shutter 13 to move the guide body 20 to the retracted end, and the motor 2 is rotated forward again. When the guide body 20 is retracted, the subsequent metal scrap is introduced into the cylinder hole 6 and is compressed in a state of being superimposed on the previously compressed one by the pressurizing ram 18 that advances. When the current value of the motor 2 reaches the limit value before the guide body 20 is detected by the forward end sensor 26a, the guide body 20 is slightly retracted to perform pressure release, and then the shutter 13 is raised. Next, the guide body 20 is advanced to the mechanical advance end, the compressed metal debris is discharged from the discharge port 14, the guide body 20 is retracted, and the shutter 13 is closed.

  The position of the advance end of the guide body 20 detected by the advance end sensor 26a is such that the dimension from the tip of the cylinder hole 6 to the tip of the pressurizing ram 18 at the advance end position is the axial length of the opening 8 of the cylinder hole. / 10 (when the compression ratio is 1/10). If the current value of the motor 2 does not reach the limit value when the forward end sensor 26a detects the guide body 20, a sufficient amount of metal debris has not been introduced into the cylinder hole 6 from the opening 8. Therefore, the backward movement and advancement of the guide body 20 are further repeated, and the metal scrap introduced during this time is added and compressed. By repeating this additional compression operation until the current value of the motor 2 reaches a limit value before the guide body 20 is detected by the forward end sensor 26a, the axial length of the compressed metal scrap discharged is predetermined. Unified within the dimension width. For example, when the length of the cylinder hole opening 8 is set to 150 mm and the compression ratio is set to 1/10, the length of the solidified material to be discharged is unified to a length slightly exceeding 15 to 30 mm to 30 mm.

  The compression device of the above structure is installed so that the hopper 9 comes under the butterfly valve for discharging dust collection dust of the dust collector attached to the laser processing machine or the plasma processing machine, and the butterfly valve is opened so that the hopper 9 By repeating the above operation until the hopper 9 is empty after the fine metal waste is discharged, the metal waste discharged from the dust collector is continuously and automatically compressed to form a short cylindrical solidified product having a uniform particle size. It can be. The empty hopper 9 is controlled by counting the number of times the guide body 20 is continuously detected by the forward end sensor 26a without the current of the motor with a reduction gear reaching a predetermined limit value. This can be detected by comparing with a preset value set in the instrument.

  As can be understood from the description of the above embodiments, the present invention compresses fine metal chips such as fumes generated from laser processing machines and plasma processing machines, chips discharged from grinding machines, drilling machines and other machine tools. Thus, it is possible to provide a small and inexpensive apparatus with a small capacity and a small installation space, so that it is possible to provide a fine metal scrap compression apparatus particularly suitable for being attached to an existing processing machine.

Sectional side view of the first embodiment device shown with the piston retracted Sectional side view of the first embodiment device shown with the piston advanced to the forward end Plan view of the apparatus of FIG. 1 is a front view of the apparatus of FIG. 1 as viewed from the discharge apparatus side. The partial cross section side view which shows the detail of the connection part of the motor and ball screw in the apparatus of FIG. Sectional side view of the second embodiment device with the piston retracted

Explanation of symbols

2 Motor with reduction gear 3 Guide cylinder 6 Cylinder hole
13 Shutter
21 Pressurized ram
22 Guide piston
23 Cylindrical recess
28 Ball nut with hook
31 Sleeve with hook
32 Ball screw
33 Bottom hole of rod
36 Hollow output shaft

Claims (5)

Solid metal is compressed between a pressure ram (18) that introduces fine metal scrap into the cylinder hole (6) and advances and retreats in the cylinder hole and a shutter (13) that closes the tip of the cylinder hole. In the compacting device for fine metal scrap,
A guide cylinder (3) having a cylindrical hole concentric with the hole and larger in diameter than the hole on the proximal end side of the cylinder hole, and a guide body (20) guided by the cylindrical hole of the guide cylinder With
The guide body includes a cylindrical recess (23) having an opening on the side opposite to the cylinder hole, a rod (21) integrally extending toward the cylinder hole, and an axial center of the rod. With a bottomed hole (33) with an open end,
A single ball screw (32) reciprocally rotated by a motor with a speed reducer (2) is disposed at the center of the cylindrical hole with its tip inserted into the bottomed hole, and screwed into the ball screw. A ball nut (28) is fixed to the guide body in a state of being housed in the cylindrical recess,
The apparatus for compressing fine metal debris, wherein a tip end portion of the rod is inserted into the cylinder hole to form the pressure ram. Solid metal is compressed between a pressure ram (18) that introduces fine metal scrap into the cylinder hole (6) and advances and retreats in the cylinder hole and a shutter (13) that closes the tip of the cylinder hole. In the compacting device for fine metal scrap,
A guide cylinder (3) having a cylindrical hole concentric with the hole and larger in diameter than the hole on the proximal end side of the cylinder hole, and a guide body (20) guided by the cylindrical hole of the guide cylinder With
The guide body includes a cylindrical recess (23) having an opening on the side opposite to the cylinder hole, a rod (21) integrally extending toward the cylinder hole, and an axial center of the rod. With a bottomed hole (33) with an open end,
A single ball screw (32) reciprocally rotated by a motor with a speed reducer (2) is disposed at the center of the cylindrical hole with its tip inserted into the bottomed hole, and screwed into the ball screw. A ball nut (28) is fixed to the guide body in a state of being housed in the cylindrical recess,
The base end of the pressure ram is connected to the tip of the rod, and a bellows (50) is provided in a portion where the rod penetrates the partition wall at the tip of the guide tube to prevent fine metal powder from entering the penetration. The apparatus for compressing fine metal scraps, characterized in that   The motor with speed reducer (2) is provided with a hollow output shaft (36), and the one ball screw (32) is a rolling screw inserted through the hollow cylindrical output portion (34) into the hollow output shaft. The apparatus for compressing fine metal debris according to claim 1 or 2, characterized by the above.   The motor with speed reducer (2) is provided with a hollow output shaft (36), and the one ball screw (32) is a rolled screw in which a cylindrical processed part (34) at the base end is inserted through the hollow output shaft. And a hooked sleeve (31) fixed to the cylindrical processed portion by a screwing portion (35) for transmitting an axial compressive force and a torque pin (37) for transmitting a rotational force in a direction perpendicular to the shaft. A thrust bearing (43) for receiving a compressive force is interposed between the flanged sleeve and a support plate (4b) fixed to the frame, with a flanged sleeve fitted into the hollow output shaft. The apparatus for compressing fine metal scraps as described.   The motor with speed reducer (2) is an inverter motor, and the pressurizing force required to solidify fine metal scraps is set by the motor current value set in the controller attached to the motor with speed reducer (2). The apparatus for compressing fine metal debris according to claim 1, 2, 3 or 4.

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