JP2014184510A - Liquid injection type belt sander - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid injection type belt sander, without causing useless liquid injection, by simple valve operation work for driving a belt polishing tool and injecting liquid.SOLUTION: The liquid injection type belt sander includes a water injection on-off valve 48 having a switching operation member 50 movable between a position for not supplying water to a water injection nozzle 38 and a position for supplying water thereto, and the switching operation member 50 of the water injection on-off valve 48 is mechanically connected to an operation lever 46 of an air switch valve 40, and since the operation lever 46 of the air switch valve 40 is positioned in a position on the side for supplying water to the water injection nozzle 38 when operated to the side for driving the belt polishing tool 32, the water injection on-off valve 48 is opened only by operating the air switch valve 40 for supplying compressed air to an air motor 20, and since water injection quantity adjusting operation is not required, working efficiency is suitably provided, and useless water injection is prevented.

Description

  The present invention relates to a liquid injection type belt sander that presses a rotationally driven belt polishing tool against a work material while polishing the work material.

  Generally, a belt sander is known in which an endless annular belt polishing tool is rotationally driven at high speed using an air motor, and the rotationally driven belt polishing tool is pressed against, for example, a corner of the work material to polish the work material. Yes. For example, it is described in Patent Document 1. In addition, a type of such belt sander includes a liquid injection nozzle that injects a polishing liquid such as water onto the polishing surface of a rotationally driven belt polishing tool, and a liquid injection valve that supplies the polishing liquid to the liquid injection nozzle. An injectable belt sander is proposed.

JP 2011-056739 A

  By the way, the liquid injection type belt sander is provided with an automatic return type air switch valve for supplying compressed air to the air motor, so that compressed air is supplied to the air motor at the start of polishing by the belt polishing tool. Therefore, it is necessary to maintain the opening operation of the two valves, that is, the operation of the air switch valve and the opening / closing operation of the liquid injection valve. For this reason, at the start of the polishing operation, in addition to the operation of the air switch valve for driving the belt polishing tool, manual injection for making the injection amount suitable for polishing with the belt polishing tool The troublesome valve operation of adjusting the injection volume by rotating the valve until the injection volume becomes appropriate is necessary, and the work efficiency is impaired, and unnecessary injection is performed. There was a problem. In particular, when the work material is a stone, it is necessary to replace 7 to 8 types of belt polishing tools having different abrasive grain sizes from roughing to finishing of the polishing. Since the above troublesome valve operation work is required every time, the above-mentioned problem becomes remarkable.

  The present invention has been made against the background of the above circumstances. The purpose of the present invention is to provide an injection-type belt that is simple in valve operation for driving and injecting a belt polishing tool and is free of unnecessary injection. To provide a thunder.

  As a result of repeating various trial manufactures against the background described above, the present inventors have provided a liquid injection on / off valve that opens and closes in conjunction with the operation of an air switch valve for supplying compressed air to the air motor. By simply operating the air switch valve for supplying the liquid, the liquid injection on-off valve is opened and the operation for adjusting the liquid injection amount is not required. Therefore, it is possible to obtain work efficiency and prevent unnecessary liquid injection. I found out. The present invention has been made based on this finding.

  That is, the gist of the present invention is that: (a) an endless annular belt polishing tool strung over a drive roller and an idle roller; an air motor that rotationally drives the drive roller by being supplied with a compression air; An air switch valve having an operation lever operable between a position where no compression air is supplied to the air motor and a position where the air motor is supplied; and a liquid injection nozzle which supplies a polishing liquid to the polishing surface of the belt polishing tool. A liquid belt sander comprising: (b) a liquid injection on / off valve having an opening / closing operation member movable between a position where the polishing liquid is not supplied to the liquid injection nozzle and a position where the polishing liquid is supplied; The opening / closing operation member of the liquid opening / closing valve is mechanically connected to the operation lever of the air switch valve, and when the operation lever of the air switch valve is operated to the drive side of the belt polishing tool, Characterized in that it is allowed to position to the position of the side for supplying the polishing liquid to Le.

  The liquid injection type belt sander according to the present invention includes a liquid injection opening / closing valve having an opening / closing operation member movable between a position where the polishing liquid is not supplied to the liquid injection nozzle and a position where the polishing liquid is supplied. The valve opening / closing operation member is mechanically connected to the operation lever of the air switch valve, and supplies the polishing liquid to the liquid injection nozzle when the operation lever of the air switch valve is operated to the drive side of the belt polishing tool. Because it is positioned to the position on the side, simply operating the air switch valve for supplying compressed air to the air motor opens the liquid injection on-off valve and eliminates the need to adjust the liquid injection volume. Efficiency is obtained and useless injection is prevented.

  Here, preferably, (d) the air motor includes a short cylindrical motor main body portion having one end fixed to a plate-shaped main body frame and a gripping portion protruding in one direction from the outer peripheral surface of the motor main body portion. (E) the liquid injection on-off valve is fixed to the main body frame at a position opposite to the gripping portion with respect to the motor main body, and (f) operation of the air switch valve The lever has a longitudinal shape in the protruding direction of the gripping part, an operation part along the gripping part, a central part located on the motor main body side of the gripping part, and a tip located on the liquid injection on / off valve side A central portion is rotatably supported by the gripping portion, and a tip end portion is connected to an opening / closing operation member of the liquid injection on / off valve so as to be relatively rotatable. As described above, since the operation lever of the air switch valve is configured as a so-called seesaw type, the liquid injection on-off valve can be simply configured and operated simply by operating the air switch valve for supplying compressed air to the air motor. Is opened, and there is an advantage that the operation of adjusting the liquid injection amount becomes unnecessary.

  Also preferably, (g) the operation lever of the air switch valve is a direction in which the opening / closing operation member of the liquid injection on / off valve is pulled out from the liquid injection on / off valve by operating the operation part to the gripping part side. Move to. For this reason, since the operation part of the operation lever of the air switch valve is operated to the grip part side by operating to grip the grip part, high workability can be obtained.

  Preferably, (h) the drive roller is fixed to one end of a drive shaft whose central portion is supported by the main body frame so as to be rotatable around a rotation axis parallel to the axis of the air motor, (i) The other end of the drive shaft is connected to the air motor via a transmission belt, and (j) the idle roller is separated from the main body frame at a position spaced apart from the drive roller in the longitudinal direction of the gripping portion. (K) The main body frame is driven at a position on the air motor side between the drive roller and the idle roller, and is rotatably supported around an idle roller support shaft standing on the drive roller side. It can rotate in the direction intersecting the straight line connecting the shaft centers of the roller and idler roller, and can rotate around the tension roller support shaft erected on the drive roller side from the main body frame Is supported tension roller is provided, (l) the belt abrasive tools, the drive roller, is hooked Maki idle roller and a tension roller. For this reason, the work material can be grind | polished by pressing between a drive roller and an idle roller among endless belt-polishing tools against a work material. The tension of the endless annular belt polishing tool can be adjusted by changing the position of the tension roller.

  Preferably, (m) the main body frame has a liquid injection nozzle that radiates or jets polishing liquid toward an outer peripheral surface of a belt polishing tool that is strung over the drive roller, idle roller, and tension roller. Is provided. As described above, the polishing liquid is radiated or jetted toward the outer peripheral surface of the belt polishing tool, so that not only water is supplied to the polishing surface of the belt polishing tool, but also the polishing surface of the belt polishing tool is clogged. Is prevented.

  Preferably, (n) the operating lever of the operating switch of the air switch valve has a safety lever that is always located at a safe position that prevents the operating portion from approaching the gripping portion, It is provided so that rotation is possible. Since this safety lever prevents an operation contrary to the meaning of the operation lever of the air switch valve, the safety of the liquid injection type belt sander is enhanced.

It is a front view explaining the principal part of a structure of the injection type belt sander of one Example of this invention. It is a reverse view explaining the principal part of a structure of the injection type belt sander of the Example of FIG. It is sectional drawing with which the injection type | formula belt sander of the Example of FIG. 1 and FIG.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  In FIG. 1 and FIG. 2, the liquid injection type belt sander 10 includes a plate-like main body frame 12 made of a metal, for example, a light alloy. A driving roller support shaft 14 is supported at one end portion of the main body frame 12 so that a central portion in the longitudinal direction thereof can be rotated by the main body frame 12. A driving roller 16 is provided at one end portion of the driving roller support shaft 14. It is fixed. The other end of the drive roller support shaft 14 penetrating through the main body frame 12 is connected to an output shaft of an air motor 20 provided at one end of the main body frame 12 via a transmission belt (not shown). Is driven to rotate by the air motor 20. 2, the other end of the drive roller support shaft 14 penetrating through the main body frame 12, the output shaft of the air motor 20, and a transmission belt are accommodated in the belt cover 22 of FIG.

  From one end of the main body frame 12, an idle roller support shaft 24 and a tension roller support shaft 26 are erected in parallel to the drive roller support shaft 14 toward the drive roller 16, and the idle roller 28 and the tension roller 30 are idle rollers. A support shaft 24 and a tension roller support shaft 26 are rotatably supported around the axis. An endless annular belt polishing tool 32 is applied to the three driving rollers 16, the idle roller 28 and the tension roller 30. The tension roller support shaft 26 is fastened to a long hole (not shown) formed in the main body frame 12 by a fastening member 34, and the drive roller is positioned between the drive roller 16 and the idle roller 28 and on the side of the air motor 20. 16 and the idle roller 28 are movable in a direction crossing a straight line connecting the axes of the idle rollers 28. Thereby, the tension of the belt polishing tool 32 is adjusted by changing the position of the tension roller 30.

  Further, a cover 36 is attached to the body frame 12 so as to cover the air motor 20 side of the endless annular belt polishing tool 32 strung over the three drive rollers 16, the idle roller 28 and the tension roller 30. A water injection nozzle 38 is disposed between the belt polishing tool 16 and irradiates or jets water as a polishing liquid onto the polishing surface which is the outer peripheral surface of the belt polishing tool 16. The main body frame 12 is provided with a handle 37 that is gripped during work.

  The air motor 20 includes a short columnar motor main body portion 20a having one axial end fixed to the other end portion of the main body frame 12, and a grip portion 20b protruding in one direction from the outer peripheral surface of the motor main body portion 20a. Yes. The air switch valve 40 accommodated in the grip 20b rotates the turbine in the air motor 20 by supplying the motor main body 20a with a compression air supplied from a compression air source 42 such as a compressor. The air switch valve 40 always protrudes from the gripping portion 20b, and operates an operating projection 44 that changes the amount of air supplied to the motor main body 20a from zero to the maximum value according to the pushing position, and operates the pushing amount of the operating projection 44. This is an automatic return type on-off valve provided with an operating lever 46 for the purpose. The air switch valve 40 is operated by an operation lever 46 between a protruding position of the operating protrusion 44 that does not supply the compression air to the motor body 20a and a pushing position of the operating protrusion 44 that supplies the compression air to the motor body 20a. Is done.

  The operation lever 46 is a so-called seesaw type member having a longitudinal shape in the protruding direction of the gripping portion 20b, and is an operation portion 46a along the gripping portion 20b, and a center located on the motor body 20a side of the gripping portion 20b. And a tip end portion 46c operatively connected to the opening / closing operation member 50 of the water injection on / off valve 48 so that the center portion 46b can rotate about the pin 46d. The operating portion 46a is biased by the distal end portion of the operating projection 44 in a direction away from the gripping portion 20b.

  The water injection on / off valve 48 is fixed to the main body frame 12 at a position opposite to the gripping portion 20b with respect to the motor main body 20a, and is inserted into a water absorption pipe 54 between a water supply source 52 such as a water tank and the water injection nozzle 38. Has been. As shown in FIG. 3, the water injection on / off valve 48 includes a valve box 48a having an input port P1 connected to a water supply source 52 via a water absorption pipe 54 and an output port P2 connected to 38, and an input Both ends communicate with the port P1 and the output port P2, and a valve chamber 48c having a valve seat 48b formed between the both ends and a valve element 48d seated on the valve seat 48b at one end and a large diameter head An opening / closing operation member 50 having a portion 50a at the other end (tip) and slidably protruding from the valve chamber 48c; and a spring 48e for urging the opening / closing operation member 50 in the seating direction. Yes. Since the opening / closing operation member 50 is seated by the urging force of the spring 48e, the opening / closing operation member 50 is always positioned at the closed position where the input port P1 and the output port P2 are closed and water is not supplied to the water injection nozzle 38. When the operating lever 46 is moved in the direction of pulling out from the valve box 48a against the urging force of the spring 48e, the valve opening is opened between the valve seat 48b and the valve element 48d to supply water to the water injection nozzle 38. To be positioned. The water injection on / off valve 48 is an automatic return type on / off valve.

  An engagement hole 46e having a diameter that allows the opening / closing operation member 50 to pass therethrough but does not allow the large-diameter head portion 50a to pass therethrough is formed in the distal end portion 46c of the operation lever 46, and the distal end portion 46c of the operation lever 46 and the opening / closing operation member 50 tip portions are connected so as to be relatively rotatable. Further, a safety lever 46f is provided on the operation portion 46a of the operation lever 46 so as to be rotatable around the pin 46g, and the safety lever 46f is brought into contact with the stopper 46i shown in FIG. Always energized. For this reason, in a state where the safety lever 46f is in contact with the stopper 46i, the safety lever 46f is substantially perpendicular to the gripping portion 20b. Therefore, an operation of gripping the gripping portion 20b and the operation lever 46 is performed. However, the operation of bringing the operating lever 46 close to the gripping portion 20b is prevented, but by operating the gripping portion 20b and the operating lever 46 while tilting the safety lever 46f against the urging force of the spring 46h, Rotation drive and water injection from the water injection nozzle are started.

  As described above, according to the liquid injection type belt sander 10 of this embodiment, the opening / closing operation is movable between a position where water (polishing liquid) is not supplied to the water injection nozzle (liquid injection nozzle) 38 and a position where the water is supplied. A water injection on / off valve (liquid injection on / off valve) 48 having a member 50 is included, and an opening / closing operation member 50 of the water injection on / off valve 48 is mechanically connected to an operation lever 46 of the air switch valve 40. When the operation lever 46 is operated to drive the belt polishing tool 32, the air switch valve 40 for supplying compressed air to the air motor 20 is positioned at a position where water is supplied to the water injection nozzle 38. Since the water injection on / off valve 48 is opened and the operation of adjusting the amount of water injection is not required only by operating this, the work efficiency is suitably obtained and unnecessary water injection is prevented.

  According to the present embodiment, the air motor 20 is unidirectional from the short cylindrical motor main body portion 20a in which one end portion in the rotation axis direction is fixed to the plate-shaped main body frame 12 and the outer peripheral surface of the motor main body portion 20a. The water injection on / off valve (liquid injection on / off valve) 48 is fixed to the body frame 12 at a position opposite to the grip 20b with respect to the motor main body 20a. The operation lever 46 of the valve 40 has a longitudinal shape in the protruding direction of the gripping portion 20b, an operation portion 46a along the gripping portion 20b, a center portion 46b of the gripping portion 46a located on the motor main body 20a side, and It has a front end portion 46c located on the water injection on / off valve 48 side, its central portion 46b is rotatably supported by the gripping portion 20b, and the front end portion is rotated relative to the opening / closing operation member 50 of the water injection on / off valve 48. Capable of being connected. As described above, the operation lever 46 of the air switch valve 40 is so-called seesaw type, so that the operation lever 46 can be simply constructed and water can be injected simply by operating the air switch valve 40 for supplying compressed air to the air motor 20. There is an advantage that the opening / closing valve 48 is opened and the operation of adjusting the water injection amount is not required.

  Further, according to the present embodiment, the operation lever 46 of the air switch valve 40 moves the opening / closing operation member 50 of the water injection opening / closing valve 48 from the water injection opening / closing valve 48 by operating the operation portion 46a toward the gripping portion 20b. Move it in the pulling direction. For this reason, since the operation part 46a of the operation lever 46 of the air switch valve 40 is operated to the grip part 20b side by operating to grip the grip part 20b, high workability is obtained.

  Further, according to this embodiment, the driving roller 16 is fixed to one end of the driving shaft 14 whose central portion is supported by the main body frame 12 so as to be rotatable around a rotation axis parallel to the axis of the air motor 20. The other end of the drive shaft 14 is connected to the air motor 20 via a transmission belt, and the idle roller 28 moves from the main body frame 12 to the drive roller 16 side at a position separated from the drive roller 16 in the longitudinal direction of the grip portion 20b. The main body frame 12 is supported so as to be rotatable around an idle roller support shaft 24 erected. The drive roller 16 and the idle roller 28 are positioned between the drive roller 16 and the idle roller 28 and on the air motor 20 side. Tension erected from the body frame 12 to the drive roller 16 side so as to be movable in a direction intersecting a straight line connecting the axes of Over La and rotatably supported the tension roller 30 is provided around the support shaft 26, belt polishing tool 32 is wound plated on the driving roller 16, the idle roller 28 and a tension roller 30. For this reason, the work material can be grind | polished by pressing between the drive roller 16 and the idle roller 28 against the work material among the endless annular belt grinding tools 32. Further, the tension of the endless annular belt polishing tool 32 can be adjusted by changing the position of the tension roller 30.

  Further, according to the present embodiment, the main body frame 12 is injected with liquid that radiates or sprays water toward the outer peripheral surface of the belt polishing tool 32 strung over the drive roller 16, idle roller 28 and tension roller 30. Since the nozzle 38 is provided, water is not only supplied to the polishing surface of the belt polishing tool 32 by radiating or jetting water from the liquid injection nozzle 38 toward the outer peripheral surface of the belt polishing tool 32. The clogging of the polishing surface of the belt polishing tool 32 is prevented.

  As mentioned above, although one Example of this invention was described in detail with reference to drawings, this invention is not limited to this Example, It can implement in another aspect.

  For example, in the above-described embodiment, the belt polishing tool 32 is strung on the three driving rollers 16, the idle roller 28, and the tension roller 30, but may be strung on two or four rollers.

  In the above-described embodiment, the operation lever 46 of the air switch valve 40 is provided on the opposite side of the belt polishing tool 32 with respect to the grip portion 20b, but may be provided on the same side as the belt polishing tool 32. Good.

  It should be noted that the above description is merely an embodiment, and other examples are not illustrated. However, the present invention is implemented in variously modified and improved modes based on the knowledge of those skilled in the art without departing from the gist of the present invention. Can do.

10: liquid injection type belt sander 12: main body frame 14: driving roller support shaft 16: driving roller 20: air motor 20a: motor main body 20b: gripping portion 28: idle roller 30: tension roller 32: belt polishing tool 38: water injection nozzle (Injection nozzle)
40: Air switch valve 44: Actuation protrusion 46: Operation lever 48: Water injection on / off valve (liquid injection on / off valve)
50: Opening / closing operation member

Claims (6)

An endless annular belt polishing tool strung over the drive roller and the idle roller, an air motor that rotationally drives the drive roller when supplied with a compression air, and a position where the compression air is not supplied to the air motor and a supply position A liquid injection type belt sander comprising: an air switch valve having an operation lever operable between and a liquid injection nozzle for supplying a polishing liquid to the polishing surface of the belt polishing tool;
A liquid injection on / off valve having an opening / closing operation member movable between a position where the polishing liquid is not supplied to the liquid injection nozzle and a position where the polishing liquid is supplied;
An opening / closing operation member of the liquid injection on / off valve is mechanically connected to an operation lever of the air switch valve, and when the operation lever of the air switch valve is operated to the drive side of the belt polishing tool, the liquid injection nozzle is polished. A liquid injection type belt sander characterized in that the liquid injection type belt sander is positioned at a position on the side of supplying the liquid. The air motor includes a short columnar motor main body portion having one end fixed to a plate-shaped main body frame, and a grip portion protruding in one direction from the outer peripheral surface of the motor main body portion,
The liquid injection on-off valve is fixed to the main body frame at a position opposite to the gripping portion with respect to the motor main body portion,
The operation lever of the air switch valve has a longitudinal shape in the protruding direction of the gripping portion, an operation portion along the gripping portion, a central portion located on the motor main body side of the gripping portion, and the liquid injection opening / closing It has a tip part located on the valve side, the center part is rotatably supported by the grip part, and the tip part is connected to the opening / closing operation member of the liquid injection on / off valve so as to be relatively rotatable. The liquid injection type belt sander according to claim 1, wherein   The operation lever of the air switch valve moves the opening / closing operation member of the liquid injection on / off valve in a direction to be pulled out from the liquid injection on / off valve by operating the operation part to the gripping part side. The injection type belt sander according to Item 2. The drive roller is fixed to one end of a drive shaft whose center is supported by the main body frame so as to be rotatable around a rotation axis parallel to the axis of the air motor;
The other end of the drive shaft is connected to the air motor via a transmission belt,
The idle roller is rotatably supported around an idle roller support shaft erected from the main body frame to the drive roller side at a position spaced apart from the drive roller in the longitudinal direction of the grip portion.
The main body frame is movable from the main body frame to the drive roller so as to be movable in a direction intersecting a straight line connecting the rotation axes of the drive roller and the idle roller between the drive roller and the idle roller at a position on the air motor side. A tension roller supported rotatably around an idle roller support shaft standing on the side is provided,
4. The liquid injection type belt sander according to claim 2, wherein the belt polishing tool is strung over the drive roller, idle roller and tension roller.   The liquid injection nozzle that radiates polishing liquid toward an outer peripheral surface of a belt polishing tool strung over the drive roller, idle roller, and tension roller is provided in the main body frame. 4 Injection belt sander.   The operating portion of the operating lever of the air switch valve is rotatably provided with a safety lever that is always located at a safe position that prevents the operating portion from approaching the gripping portion. The liquid injection type belt sander according to claim 4.

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