JP2008149384A - Movable carriage arrangement having extensible type dust preventing cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an extensible type dust preventing cover which can avoid the generation of the damage in the guide surfaces of a linear guide portion and the screws, the teeth of a rack, etc. of the feed mechanism of the movable carriage to be caused by the air sucking phenomenon into the dust preventing cover, even when the feed speed is increased. <P>SOLUTION: A column base (movable carriage) 14 is provided with ventilation passages (ventilating holes 51, 52, ventilating ducts 53, 54) for communicating the inside spaces 35, 45 of the dust preventing covers 31, 41 arranged on both sides of the column base 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a moving table apparatus with a telescopic dustproof cover, and more particularly to a moving table apparatus with a telescopic dustproof cover for a machine tool that reciprocates at high speed.

A moving table device having a moving table that is guided by a linear guide provided on a fixed table, such as a movable column base of a machine tool or a sliding work table, reciprocates on the fixed table, has a protection function for the linear guide. For this reason, there are some which are provided with a telescopic dustproof cover such as a telescopic cover that covers the linear guide part on both sides of the reciprocating direction of the moving table and expands and contracts with the reciprocating movement of the moving table (for example, patents) Reference 1).
JP-A-8-192332

  When the moving table is guided by the linear guide portion and moves on the fixed table, the dust-proof cover on the front side of the moving table contracts, and the dust-proof cover on the rear side of the moving table extends. The shrinkage and extension of the dustproof cover reduces the volume of the inner space of the dustproof cover on the shrinking side (the space existing between the fixed base and the dustproof cover), and the volume of the inner space of the dustproof cover on the expanding side becomes smaller. Increase.

  Since the inner spaces on both sides of the moving table are connected to each other through a gap between the bottom of the moving table and the fixed table, air flows between the inner spaces as the volume changes.

  However, the air gap between the bottom of the moving base and the fixed base has a small cross-sectional area as a ventilation path, resulting in a large ventilation resistance, and the internal pressure is atmospheric pressure on the side that shrinks as the dustproof cover contracts and expands. The air that has risen above and is present in the inner space of the dust-proof cover blows out of the dust-proof cover.On the other hand, on the extension side, the internal pressure drops below atmospheric pressure, and the dust-proof cover The phenomenon of inhaling air occurs.

  The air is sucked into the dust proof cover when the water-soluble cutting agent, cutting oil, chips, dust, etc. that are scattered and floating around the outside of the dust proof cover are sucked into the dust proof cover, and the straight line that exists in the dust proof cover. The guide surface of the guide part, the screw of the feed mechanism of the moving table, the rack teeth, etc. may be damaged or soiled.

  On the other hand, in the telescopic cover, air is sucked into the dust-proof cover by closing the gap between the dust-proof covers with a rubber wiper or a metal shoe, or narrowing the gap between the dust-proof cover and the fixing base with a screen plate. Ingenuity has been made to reduce.

  However, with these devices, it is not possible to eliminate the inhalation of air into the dust proof cover, and the higher the feed rate (moving table moving speed), the higher the inner space of the dust proof cover. Since the increase / decrease speed of the volume is increased and the abrupt pressure drop in the inner space on the extension side is increased accordingly, the air suction phenomenon increases as the feed rate increases. For this reason, with the recent increase in the feed rate, there is a concern that the guide surface of the linear guide part, the screw of the moving table feed mechanism, the rack teeth, etc. may be damaged due to the phenomenon of air suction into the dust cover. It is becoming.

  The problem to be solved by the present invention is to reduce and avoid a sudden pressure drop in the inner space on the extension side of the dustproof cover due to the reciprocating movement of the movable table, and even if the feed rate is increased, the dustproof cover is moved into the dustproof cover. It is to avoid the occurrence of obstacles such as the guide surface of the linear guide portion, the screw of the moving table feed mechanism, the rack teeth, etc., caused by the air suction phenomenon.

  The movable stand apparatus with a telescopic dustproof cover according to the present invention has a movable base that is guided by a linear guide portion provided on the fixed base and reciprocates on the fixed base, on both sides in the reciprocating direction of the movable base. In the moving table apparatus with a telescopic dustproof cover, each provided with a dustproof cover that covers the linear guide portion and expands and contracts with the reciprocating movement of the moving table, the moving table is present on each side of the moving table. A ventilation passage is formed to communicate and connect the inner space of the dust cover.

  In the movable stand device with a telescopic dustproof cover according to the present invention, preferably, the vent passage is a vent passage having a duct structure extending in a reciprocating direction of the movable stand.

  The movable stand apparatus with a telescopic dustproof cover according to the present invention preferably further increases the volume due to the extension of the dustproof cover through the air passage through the air in the inner space whose volume is reduced by the shrinkage of the dustproof cover. An electric blower fan device for blowing air to the inner space on the side to be operated is provided.

  Preferably, the movable stand apparatus with the telescopic dustproof cover according to the present invention preferably further includes a side where the volume is increased by the extension of the dustproof cover through the ventilation passage from the inner space where the volume is reduced due to the shrinkage of the dustproof cover. An ejector-type air injection nozzle that injects compressed air toward the inner space of the inner space is provided, and the air injection nozzle is configured to increase the volume of the air in the inner space on the side where the volume decreases due to the ejector effect. Send to.

  In addition, the movable stand apparatus with an extendable dustproof cover according to the present invention has a movable base that is guided by a linear guide portion provided on the fixed base and reciprocates on the fixed base, in the reciprocating direction of the movable base. In the movable stand device with a telescopic dustproof cover, which is provided on both sides, covers the linear guide portion, and has a dustproof cover that expands and contracts with the reciprocating movement of the movable base, the dustproof cover of the inner space of the dustproof cover. An air injection nozzle for directly supplying compressed air to the inner space on the side where the volume increases due to the expansion of the air is provided.

  Preferably, the movable stand apparatus with the telescopic dustproof cover according to the present invention is further configured to inject and supply compressed air to both inner spaces of the dustproof cover on both sides of the movable base when the movable base is in a feed stop state. An air injection nozzle is provided.

  According to the movable stand device with a telescopic dustproof cover according to the present invention, the air in the inner space of the dustproof cover on the side whose volume is reduced (shrinkable side) as the movable table is moved passes through the ventilation passage formed in the movable table. Thus, it flows into the inner space of the dust cover on the side where the volume increases (extension side).

  As a result, the sudden pressure drop in the inner space on the extension side of the dust cover due to the reciprocating movement of the moving base is reduced or avoided compared to the case where there is no ventilation passage, and even if the feed speed is increased, Inhalation of air into the dustproof cover is reduced or eliminated, and the occurrence of obstacles such as the guide surface of the straight guide part, the screw of the moving table feed mechanism, and rack teeth due to the phenomenon of air inhalation into the dustproof cover is avoided. .

  A first embodiment in which a movable stand apparatus with a telescopic dustproof cover according to the present invention is applied to a machine tool will be described with reference to FIGS.

  The machine tool of the present embodiment is a horizontal milling boring machine, and has a fixedly arranged bed 11 as a fixed base. Horizontal straight guide portions 12 and 13 are formed on the upper surface of the bed 11. A column base 14 is placed on the bed 11. The column base 14 is a moving table, and is guided by the linear guide portions 12 and 13 so as to be reciprocally movable on the bed 11 in the X-axis direction.

  An X-axis feed screw rod 15 is attached to the bed 11 so as to be rotatable about its own central axis. An X-axis feed nut member 16 threadedly engaged with the X-axis feed screw rod 15 is fixedly mounted on the column base 14. The X-axis feed screw rod 15 is drivingly connected to the X-axis servomotor 18 via a gear train (not shown) incorporated in a gearbox 17 attached to the bed 11 and is rotationally driven by the X-axis servomotor 18. The As the X-axis feed screw rod 15 rotates, the column base 14 moves in the X-axis direction.

  A spindle head 20 is erected vertically on the column base 14. Vertical straight guide portions 21 and 22 are formed on the side surface portion of the spindle head 20. A ram 23 is disposed on the side surface of the spindle head 20. The ram 23 is guided by the linear guide portions 21 and 22 and can reciprocate in the Y-axis direction.

  A Y-axis feed screw rod 24 is attached to the spindle head 20 so as to be rotatable about its own central axis. A Y-axis feed nut member 25 that is screw-engaged with the Y-axis feed screw rod 24 is fixedly attached to the spindle head 20. The Y-axis feed screw rod 24 is drivingly connected to a Y-axis servomotor 27 via a gear train (not shown) incorporated in a gear box 26 attached to the spindle head 20, and is rotationally driven by the Y-axis servomotor 27. Is done. As the Y-axis feed screw rod 24 rotates, the spindle head 20 moves in the Y-axis direction.

  A ram 28 is provided on the spindle head 20 so as to be movable in the front-rear horizontal direction (Z-axis direction). A boring main shaft 29 is provided on the front surface of the ram 28 so as to be extended in the front-rear horizontal direction (W-axis direction).

  At the rear of the spindle head 20, a Z-axis servo motor that drives the ram 28 in the Z-axis direction, a W-axis servo motor that drives the boring spindle 29 in the W-axis direction, and a boring spindle 29, which are not shown in the drawing, are shown. A drive device 30 incorporating a spindle motor or the like for rotationally driving is attached.

On both sides of the column base 14 in the reciprocating direction, dust-proof covers 31 and 41 that cover the linear guide portions 12 and 13 and expand and contract as the column base 14 reciprocates are attached. The dust-proof cover 31 is a telescopic cover, and has a structure in which telescopic cover elements 31A, 31B, 31C, 31D, and 31E whose cross-sectional dimensions are changed little by little by bending a thin iron plate in order are expanded and contracted in order. The dust-proof cover 41 is a telescopic cover equivalent to the dust-proof cover 31, and telescopic cover elements 41A, 41B, 41C, 41D, and 41E whose cross-sectional dimensions are changed little by little by bending a thin iron plate in order are expanded and contracted. As shown in FIG. 4 (a) and FIG. 4 (b), the dustproof cover 31 having a structure has a telescopic cover element 31A having a maximum cross-sectional shape on one side end surface of the column base 14. A telescopic cover element 31E having a minimum cross-sectional shape is fixed to one side end surface of the bed 11, contracted by + X axis direction movement (right direction movement) of the column base 14, and −X axis direction movement (left direction movement). Elongate.

  4A and 4B, the dust cover 41 has a telescopic cover element 41A having a maximum cross-sectional shape fixed to the other side end surface of the column base 14 and has a minimum cross-section. A telescopic cover element 41E having a shape is fixed to the other side end surface of the bed 11, and is extended by movement of the column base 14 in the + X-axis direction and contracted by movement of the −X-axis direction, contrary to the dust cover 31.

  The dust covers 31 and 41 define inner spaces 35 and 45 between the dust covers 31 and 41, respectively. The telescopic cover elements 31B, 31C, 31D, and 31E of the dust cover 31 and the 41B, 41C, 41D, and 41E of the dust cover 41 are provided with partition plate portions 32 and 42 for maintaining strength, respectively. Since the partition plate portions 32 and 42 are provided with pressure equalizing openings 33 and 43, the inner spaces 35 and 45 are each one pressure.

  Vent holes 51 and 52 are formed in the column base 14 in parallel with each other as vent passages that connect the inner space 35 of the dust-proof cover 31 and the inner space 45 of the dust-proof cover 41 existing on both sides of the column base 14 to each other. Has been. The vent holes 51 and 52 are also formed through the inner rib 19 of the column base 14 as cast holes, and communicate with the inner spaces 35 and 45 so as to be able to vent each other through the ram base 14 in the X-axis direction. Connected.

  Further, the column base 14 has a reciprocating movement direction (the reciprocating direction of the column base 14) as a ventilation passage that connects the inner space 35 of the dust-proof cover 31 and the inner space 45 of the dust-proof cover 41 that are respectively present on both sides of the column base 14 to communicate with each other. Ventilation ducts 53 and 54 extending in the (X-axis direction) are attached in parallel to each other. The ventilation ducts 53 and 54 are inserted into a cast hole formed in the column base 14 and attached to the column base 14. One of the ventilation ducts 53 and 54 opens to the inner space 35 and the other opens to the inner space 45. As a straight passage with a small amount, the inner spaces 35 and 45 are connected to each other so as to allow ventilation.

  According to the above configuration, the air in the inner space 35 or 45 of the dust-proof cover 31 or 41 on the side where the volume is reduced (contraction side) with the movement of the column base 14 in the X-axis direction, the bottom of the column base 14 and the bed 11. In addition to the air gap 49, the air flows through the ventilation holes 51 and 52 and the ventilation ducts 53 and 54 to the inner space 45 or 35 of the dustproof cover 41 or 31 on the side where the volume is increased (extension side).

  That is, when the column base 14 moves in the + X-axis direction (rightward as viewed in FIGS. 2 and 4), the dustproof cover 31 contracts as the column base 14 moves in the + X-axis direction, and the volume decreases. 35 air passes through the air holes 51 and 52 and the air ducts 53 and 54 in addition to the air gap 49 between the bottom of the column base 14 and the bed 11, and the dustproof cover 41 extends to increase the volume. It flows into the space 45.

  On the other hand, when the column base 14 moves in the −X-axis direction (leftward as viewed in FIGS. 2 and 4), the dust-proof cover 41 contracts as the column base 14 moves in the + X-axis direction. In addition to the air gap 49 between the bottom of the column base 14 and the bed 11, the air in the inner space 45 of the cover 41 passes through the vent holes 51 and 52 and the vent ducts 53 and 54, and the side on which the volume increases (extends). Flow to the inner space 35 of the dust-proof cover 31 on the side).

  Thus, in addition to the air gap 49 existing in the mechanical structure, air flows between the inner spaces 35 and 45 through the vent holes 51 and 52 and the vent ducts 53 and 54 provided in the column base 14. The abrupt pressure drop in the inner spaces 35 and 45 on the extension side of the dustproof covers 31 and 41 accompanying the reciprocating movement of the column base 14 without greatly changing the mechanical configuration causes the vent holes 51 and 52 and the vent ducts 53 and 54 to It is reduced or avoided as compared to the case where there is no.

  In particular, the air ducts 53 and 54 are connected to the inner spaces 35 and 45 through a straight passage that is free of obstruction with respect to the air flow and has low air resistance (ventilation resistance). The air flow between the dustproof covers 31 and 41 works to avoid the pressure drop in the inner spaces 35 and 45 on the extending side of the dustproof covers 31 and 41 effectively.

  Thereby, even if the X-axis feed speed of the column base 14 is increased, the suction of air into the dust covers 31 and 41 is reduced or eliminated, and the linear guide portions 12 and 13 caused by the phenomenon of air suction are eliminated. Occurrence of failure of the guide surface and the X-axis feed screw rod 15 of the feed mechanism is less likely to occur or is avoided.

  The number of the vent holes 51 and 52, the vent ducts 53 and 54, and the passage cross-sectional area may be set according to the required performance, and even if the column base 14 moves at the maximum feed rate on the X axis, It is preferable that the space 35 or 45 is set so as not to fall into a large negative pressure state.

  As shown in FIG. 5, the ventilation passage of the duct structure is formed by internal conduit ducts 55 and 56 provided in the column base 14 and an external conduit 57 extending outside the column base 14. But you can.

  A second embodiment in which the movable stand device with a telescopic dustproof cover according to the present invention is applied to a machine tool will be described with reference to FIG. In FIG. 6, parts corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof is omitted.

  In this embodiment, electric blower fan devices (ventilation fans) 61 and 62 are provided. The blower fan devices 61 and 62 pass the air in the inner space 35 or 45 on the side whose volume is reduced by contraction of the dustproof cover 31 or 41 through the ventilation ducts 53 and 54 provided in the column base 14, and the dustproof cover 41 or 31. The air is forcedly blown into the inner space 45 or 35 on the side where the volume is increased by the extension of.

  Specifically, the blower fan device 61 is provided at an opening end with respect to the inner space 35 of the ventilation duct 53 and is activated when the column base 14 moves in the + X-axis direction, and causes the air in the inner space 35 to pass through the ventilation duct 53 on the opposite side. Into the inner space 45 of Another blower fan device 62 is provided at the opening end of the ventilation duct 54 with respect to the inner space 45, and is activated when the column base 14 moves in the −X-axis direction, so that the air in the inner space 45 passes through the ventilation duct 54 to the opposite side. Into the inner space 35 of

  As a result, when the column base 14 moves in the + X-axis direction, the blower fan device 61 is activated in conjunction therewith, and the air in the inner space 35 where the dustproof cover 31 contracts and the volume is reduced becomes the bottom of the column base 14. In addition to the air gap 49 between the bed 11 and the bed 11, the blower fan device 61 passes through the ventilation duct 53 and is sent into the inner space 45 where the dustproof cover 41 expands to increase its volume.

  On the contrary, when the column base 14 moves in the −X-axis direction, the blower fan device 62 is activated in conjunction with it, and the air in the inner space 45 where the dustproof cover 41 contracts and the volume is reduced becomes the column. In addition to the gap 49 between the bottom of the base 14 and the bed 11, the blower fan device 62 passes through the ventilation duct 54 and is sent to the inner space 35 where the dust-proof cover 31 extends and the volume increases.

  In this way, in addition to the air gap 49 that exists in the mechanical structure, through the ventilation ducts 53 and 54 provided in the column base 14, the space between both the inner spaces 35 and 45 is forcedly blown by the blower fan devices 61 and 62. When the air flows, a rapid pressure drop in the inner spaces 35 and 45 on the extension side of the dustproof covers 31 and 41 due to the reciprocating movement of the column base 14 is reduced or avoided.

  Thereby, even if the X-axis feed speed of the column base 14 is increased, the suction of air into the dust covers 31 and 41 is reduced or eliminated, and the linear guide portions 12 and 13 caused by the phenomenon of air suction are eliminated. Occurrence of failure of the guide surface and the X-axis feed screw rod 15 of the feed mechanism is less likely to occur or is avoided.

  The amount of air blown by the blower fan devices 61 and 62 can be set to an appropriate amount without excess or deficiency by speed control of the electric motors 63 and 64 of the blower fan devices 61 and 62. In the case of a numerically controlled machine tool, as shown in FIG. 7, an electric motor 63 corresponding to the X-axis feed speed F of the column base 14 by a numerical controller 65 that performs X-axis feed control of the column base 14, The rotational speed N = F (f) 0 of 64 is calculated, and in the case of movement in the + X-axis direction, a speed command is output from the numerical controller 65 to the inverter 66 that controls the speed of the electric motor 63, and movement in the -X-axis direction is performed. In this case, the numerical controller 65 outputs a speed command to the inverter 67 that controls the speed of the electric motor 64.

  Thus, the rotational speed of the electric motors 63 and 64 of the blower fan devices 61 and 62 is optimally controlled according to the X-axis feed speed F of the column base 14 according to the X-axis feed direction of the column base 14, and this speed control is performed. Therefore, the amount of air blown by the blower fan devices 61 and 62 is set to an optimum value, that is, an appropriate amount without excess or deficiency, and the pressure in the inner spaces 35 and 45 on the extension side of the dustproof covers 31 and 41 when the column base 14 is reciprocated. A drop below atmospheric pressure is accurately prevented.

  In the embodiment shown in FIG. 6, air injection nozzles 71 and 72 for supplying compressed air to each of the inner space 35 of the dustproof cover 31 and the inner space 45 of the dustproof cover 41 are attached to the bed 11. ing. The air injection nozzles 71 and 72 quantitatively inject a relatively small amount of compressed air into both the inner spaces 35 and 45 when the column base 14 is in the feed stop state.

  As a result, when the column base 14 is in the feed stop state, the pressure in the inner spaces 35 and 45 is slightly higher than the atmospheric pressure even in a state in which the inner pressure drops due to a temperature change (temperature drop) in the inner spaces 35 and 45. Kept. As described above, the pressure in the inner spaces 35 and 45 is maintained at a pressure slightly higher than the atmospheric pressure, so that air is not sucked into the dustproof covers 31 and 41 (breathing phenomenon) even in the stopped state, Failure of the guide surfaces of the linear guide portions 12 and 13 and the X-axis feed screw rod 15 of the feed mechanism due to the suction phenomenon is unlikely to occur or is avoided.

  The blower fan device 61 that feeds air from the inner space 35 to the inner space 45 when moving in the + X-axis direction, and the blower fan device 62 that feeds air from the inner space 45 to the inner space 35 when moving in the −X-axis direction are: As shown in FIG. 8, one ventilation duct 53 may be disposed opposite to both ends.

  In this case, on the air outlet side, outlet boxes 77 and 78 opened and closed by dampers 75 and 76 are provided at openings at both ends of the ventilation duct 53 so that the blower fan device 61 or 62 in the operation stop state does not become a ventilation resistance. Each is attached, and the blower fan devices 61 and 62 are attached to the outlet boxes 77 and 78, respectively. The dampers 75 and 76 are electrically driven and pneumatically driven. When the blower fan device 61 is operated when the column base 14 moves in the + X-axis direction, the damper 75 is closed and the damper 76 is opened. On the other hand, when the column base 14 is moved in the −X-axis direction, the damper 76 is closed and the damper 75 is opened when the blower fan device 62 is operated.

  A third embodiment in which the movable stand device with a telescopic dustproof cover according to the present invention is applied to a machine tool will be described with reference to FIG. In FIG. 9 as well, portions corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and description thereof is omitted.

  In this embodiment, an air box 81 is attached to the open end of the ventilation duct 53 with respect to the inner space 35, and an air injection nozzle 82 is attached to the air box 81. Another air box 83 is attached to the open end of the ventilation duct 53 with respect to the inner space 45, and another air injection nozzle 84 is attached to the air box 83.

  Each of the air injection nozzles 82 and 84 is of an ejector type, and is attached to the end surface portion of the air box 81 or 83 and directly opposed to the opening end of the ventilation duct 53. Air inlet / outlet openings 85 and 86 are provided on the side surfaces of the air boxes 81 and 83.

  When the column base 14 moves in the + X-axis direction, the air injection nozzle 82 passes through the ventilation duct 53 from the inner space 35 on the side where the volume decreases due to the shrinkage of the dustproof cover 31, and increases in volume due to the extension of the dustproof cover 41. Compressed air is injected toward the inner space 45 of the. The air injection nozzle 82 exerts an ejector effect by this air injection, and sucks the air in the inner space 35 on the side whose volume is reduced from the air inlet / outlet opening 85 of the air box 81 into the air box 81. This air is sent together with the air jetted from the air jet nozzle 82 through the ventilation duct 53 to the inner space 45 on the side where the volume is increased from the air inlet / outlet opening 86 of the air box 83.

  When the column base 14 moves in the −X-axis direction, the air injection nozzle 84 increases in volume due to the extension of the dustproof cover 31 through the ventilation duct 53 from the inner space 45 on the side where the volume decreases due to the shrinkage of the dustproof cover 41. Compressed air is injected toward the inner space 35 on the side. The air injection nozzle 84 exerts an ejector effect by the air injection, and sucks the air in the inner space 45 on the side whose volume is reduced from the air inlet / outlet opening 86 of the air box 83 into the air box 83. This air is sent together with the air jetted from the air jet nozzle 84 through the ventilation duct 53 to the inner space 35 on the side where the volume increases from the air inlet / outlet opening 85 of the air box 83.

  As a result, even if the X-axis feed speed of the column base 14 is increased, it is possible to reduce or avoid the sudden decrease in the internal pressure of the inner spaces 35 and 45 on the extension side of the dust covers 31 and 41. The suction of air into the covers 31 and 41 is reduced or no suction occurs, and it is difficult for the guide surfaces of the linear guide portions 12 and 13 and the X-axis feed screw rod 15 of the feed mechanism to be damaged due to the air suction phenomenon. Become or be avoided.

  The air injection amount from the air injection nozzles 82 and 84 when the column base 14 is moving in the X-axis direction should be set to an appropriate amount that is not excessive or insufficient according to the X-axis feed speed of the column base 14. Is preferred.

  When the column base 14 is in the feed stop state, both the air injection nozzles 82 and 84 quantitatively inject a relatively small amount of compressed air into the inner spaces 35 and 45.

  As a result, when the column base 14 is in the feed stop state, the pressure in the inner spaces 35 and 45 is slightly higher than the atmospheric pressure even in a state in which the inner pressure drops due to a temperature change (temperature drop) in the inner spaces 35 and 45. Kept. As described above, since the pressure in the inner spaces 35 and 45 is maintained at a pressure slightly higher than the atmospheric pressure, air is not sucked into the dustproof covers 31 and 41 (breathing phenomenon) even when the feeding is stopped. Occurrence of troubles in the guide surfaces of the linear guide portions 12 and 13 and the X-axis feed screw rod 15 of the feed mechanism due to the suction phenomenon is difficult or avoided.

  Next, an embodiment of an air injection amount control circuit using the air injection nozzles 82 and 84 will be described with reference to FIG.

  This air injection amount control circuit supplies compressed air from a compressed air source 91 to air injection nozzles 82 and 84 via a pressure relief valve 92 and an electromagnetic proportional flow control valve 93 with a fully closed / flow path switching function. And a system for supplying compressed air from the compressed air source 91 to the air injection nozzles 82 and 84 via the electromagnetic on-off valve 94 and the variable throttle valves 95 and 96.

  The electromagnetic proportional flow rate control valve 93 is controlled by a numerical control device that performs X-axis feed control of the column base 14. When the column base 14 moves in the + X-axis direction according to the X-axis feed direction and speed, The flow rate is controlled according to the flow rate according to the X-axis feed rate, and compressed air is supplied to the air injection nozzle 82. On the other hand, when moving in the -X-axis direction, the flow rate is controlled according to the X-axis feed rate at that time. To supply compressed air to the air injection nozzle 84. When the column base 14 is moving in the X-axis direction, the electromagnetic on-off valve 94 is closed.

  Thereby, the air injection amount from the air injection nozzles 82 and 84 when the column base 14 is moving in the X-axis direction is set to an appropriate amount that is not excessive or insufficient according to the X-axis feed speed of the column base 14. The

  When the column base 14 is in the feed stop state, the electromagnetic proportional flow control valve 93 is fully closed, and the electromagnetic on-off valve 94 is opened. Thereby, a relatively small amount of air measured by the variable throttle valves 95 and 96 is injected from the silencers 97 and 98 into the inner spaces 35 and 45.

  As shown in FIG. 9, the ejector type air injection nozzle sucks air from the back side by the ejector effect, as shown in FIG. 11, in addition to the air sucked from the periphery of the nozzle by the ejector effect. The air injection nozzles 87 and 88 may be used. In this case, air suction ports 89 and 90 are provided at the back positions of the air injection nozzles 87 and 88.

  A fourth embodiment in which the movable stand apparatus with a telescopic dustproof cover according to the present invention is applied to a machine tool will be described with reference to FIG. Also, in FIG. 12, the parts corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and the description thereof is omitted.

  In this embodiment, air injection nozzles 101 and 102 for directly supplying compressed air to the inner space 35 or 45 on the side where the volume is increased by contraction of the dustproof cover 31 or 41 are attached to the bed 11.

  When the column base 14 moves in the −X-axis direction, the air injection nozzle 101 directly injects compressed air into the inner space 35 whose volume increases due to the extension of the dustproof cover 31, and the other air injection nozzle 102 When the 14 moves in the + X-axis direction, the compressed air is directly injected into the inner space 45 whose volume is increased by the extension of the dust cover 41.

  The air injection amount from the air injection nozzles 101 and 102 when the column base 14 is moved in the X-axis direction is set to an appropriate amount that is not excessive or insufficient according to the X-axis feed speed of the column base 14 as in the third embodiment. can do.

  Thereby, also in this embodiment, even if the X-axis feed speed of the column base 14 is increased, the internal pressure of the inner spaces 35 and 45 on the extension side of the dust covers 31 and 41 can be reduced or avoided. Accordingly, the suction of air into the dustproof covers 31 and 41 is reduced or eliminated, and the guide surfaces of the linear guide portions 12 and 13 and the X-axis feed screw rod 15 of the feed mechanism caused by the air suction phenomenon are reduced. Failures are less likely to occur or are avoided.

  Also in this embodiment, both the air injection nozzles 101 and 102 may quantitatively inject a relatively small amount of compressed air into the inner spaces 35 and 45 when the column base 14 is in the feed stop state.

  As a result, even in this embodiment, inhalation of air (breathing phenomenon) into the dust-proof covers 31 and 41 is eliminated in the feed stop state, and the guide surfaces of the linear guide portions 12 and 13 and the feeding mechanism caused by the air suction phenomenon are eliminated. Occurrence of a failure in the X-axis feed screw rod 15 becomes difficult or avoided.

  Also in this embodiment, a ventilation duct 53 or the like for connecting the inner spaces 35 and 45 may be provided as necessary.

  In addition to the above-described embodiment, the movable stand apparatus with a telescopic dustproof cover according to the present invention can be applied to a dustproof cover for a bed type machine tool or a cross rail, and can also be applied to a semiconductor manufacturing apparatus or the like.

It is a perspective view which shows Embodiment 1 which applied the movable stand apparatus with an expansion-contraction type dustproof cover by this invention to the horizontal milling boring machine. It is a plane sectional view of the important section of Embodiment 1 which applied the movable stand apparatus with a telescopic dustproof cover by this invention to a horizontal milling boring machine. It is a longitudinal cross-sectional view of the principal part of Embodiment 1 which applied the movable stand apparatus with an expansion-contraction type dustproof cover by this invention to the horizontal milling boring machine. (A), (b) is explanatory drawing which shows in figure the structure of an expansion-contraction type dustproof cover. FIG. 6 is a plan sectional view of a main part showing a modification of the first embodiment. It is a plane sectional view of the important section of Embodiment 2 which applied the movable stand apparatus with a telescopic dustproof cover by this invention to a horizontal milling boring machine. FIG. 6 is a block diagram illustrating an example of a control system according to a second embodiment. FIG. 10 is a plan sectional view of a main part showing a modification of the second embodiment. It is a plane sectional view of the principal part of Embodiment 3 which applied the movable stand apparatus with a telescopic dustproof cover by this invention to a horizontal milling boring machine. FIG. 6 is a circuit diagram illustrating an example of a control system according to a third embodiment. FIG. 10 is a plan sectional view of a main part showing a modification of the third embodiment. It is a plane sectional view of the important section of Embodiment 4 which applied the movable stand apparatus with a telescopic dustproof cover by this invention to a horizontal milling boring machine.

Explanation of symbols

11 Bed 12, 13 Linear guide portion 14 Column base 15 X-axis feed screw rod 16 X-axis feed nut member 17 Gear box 18 X-axis servo motor 19 Internal rib 20 Spindle head 21, 22 Linear guide portion 23 Ram 24 Y-axis feed screw Rod 25 Y-axis feed nut member 26 Gear box 27 Y-axis servo motor 28 Ram 29 Boring spindle 30 Drive unit 31 Dust-proof cover 31A, 31B, 31C, 31D Telescopic cover element 32 Screen plate part 33 Pressure equalizing opening 35 Internal space 41 Dust-proof Cover 41A, 41B, 41C, 41D, 41E Telescopic cover element 42 Screen plate portion 43 Pressure equalizing opening 45 Internal space 49 Air gap 51, 52 Vent hole 53, 54 Vent duct 55, 56 Internal conduit 57 External conduit 61, 62 Blower fan device 63, 64 Electric motor 65 Numerical system Device 66, 67 Inverter 71, 72 Air injection nozzle 75, 76 Damper 77, 78 Outlet box 81 Air box 82 Air injection nozzle 83 Air box 84 Air injection nozzle 85, 86 Air inlet / outlet opening 87, 88 Air injection nozzle 89, 90 Air Suction port 91 Compressed air source 92 Pressure relief valve 93 Electromagnetic proportional flow control valve 94 Electromagnetic on-off valve 95, 96 Variable throttle valve 97, 98 Silencer 101, 102 Air injection nozzle

Claims (6)

A movable table guided by a linear guide provided on the fixed table and reciprocatingly moved on the fixed table; provided on both sides in the reciprocating direction of the movable table; covering the linear guide unit; In the mobile stand device with a telescopic dustproof cover having a dustproof cover that expands and contracts with the reciprocating movement of the base,
A movable stand apparatus with a telescopic dustproof cover, wherein the movable stand is formed with a ventilation passage that connects and communicates with the inner space of the dustproof cover that exists on both sides of the movable stand.   The mobile stand device with a telescopic dustproof cover according to claim 1, wherein the vent passage is a duct passage having a duct structure extending in a reciprocating direction of the mobile base.   An electric blower fan device is provided that blows the air in the inner space whose volume is reduced by the shrinkage of the dust cover through the ventilation passage to the inner space whose volume is increased by the extension of the dust cover. The movable stand apparatus with a telescopic dustproof cover according to claim 1 or 2.   An ejector type air injection nozzle that injects compressed air from the inner space whose volume is reduced by contraction of the dust cover through the ventilation passage toward the inner space whose volume is increased by extension of the dust cover. 3. The movable stand device with a telescopic dustproof cover according to claim 1, wherein the air injection nozzle sends air in an inner space whose volume is reduced due to an ejector effect to an inner space where the volume is increased. . A movable table guided by a linear guide provided on the fixed table and reciprocatingly moved on the fixed table; provided on both sides in the reciprocating direction of the movable table; covering the linear guide unit; In the mobile stand device with a telescopic dustproof cover having a dustproof cover that expands and contracts with the reciprocating movement of the base,
A movable stand apparatus with a telescopic dustproof cover provided with an air injection nozzle that directly injects compressed air into an inner space on the side of the dustproof cover whose volume is increased by the extension of the dustproof cover.   The air injection nozzle which injects and supplies compressed air to both of the inner spaces of the dustproof covers on both sides of the moving table when the moving table is in a feed stop state. The movable stand apparatus with a telescopic dustproof cover according to the item.

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