JP2006263880A

JP2006263880A - Air nailing machine with pressure reducing valve

Info

Publication number: JP2006263880A
Application number: JP2005087357A
Authority: JP
Inventors: Yukiyoshi Maehara; 幸義前原
Original assignee: Hitachi Koki Co Ltd
Current assignee: Koki Holdings Co Ltd
Priority date: 2005-03-24
Filing date: 2005-03-24
Publication date: 2006-10-05

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a lateral size of an air nailing machine and to quickly leak pressure more than set pressure (pressure on a secondary side) to prevent the pressure more than the set pressure of the pressure reducing valve from being applied to the nailing machine, regarding the air nailing machine mounted with the pressure reducing valve capable of reducing compressed air of high pressure to a region of normal pressure. <P>SOLUTION: A mounting screw of the pressure reducing valve is changed from a taper screw to a flat screw, and a switching valve relief groove is provided. As a result, the air nailing machine 60 mounted with the pressure reducing valve capable of sufficiently supplying air to the nailing machine and surely working a relief function can be obtained. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、高圧の圧縮空気を常圧の領域に減圧することが可能な減圧弁が装着された空気釘打機に関するものである。 The present invention relates to an air nailer equipped with a pressure reducing valve capable of reducing high pressure compressed air to a normal pressure region.

図１２に従来の減圧弁付空気釘打機の一例を示す。減圧弁（減圧機構部）１２０のアダプタ１０８には釘打機本体１５０へ取付けるための取付けネジ部１０９を有しており、このネジ部１０９は管用テーパネジとなっている。このことにより、弁体１０３のピストンロッド部１１０より後の流路はピストンロッド部１１０より細い径になってしまい、弁体１０３は釘打機本体１５０より外側に配置されている。 FIG. 12 shows an example of a conventional air nailer with a pressure reducing valve. The adapter 108 of the pressure reducing valve (pressure reducing mechanism) 120 has a mounting screw portion 109 for mounting to the nailing machine body 150, and this screw portion 109 is a pipe taper screw. As a result, the flow path after the piston rod portion 110 of the valve body 103 has a smaller diameter than the piston rod portion 110, and the valve body 103 is disposed outside the nailing machine body 150.

図１３には図１２のＡ部拡大の従来の減圧弁（減圧機構部）１２０の内部構造の一例を示す。シリンダケース１０２内の弁体１０３への、開閉弁１０４の圧接はバネ１０６で行い、開閉弁凹部１０４ａを円錐形とし、弁体凸部１０３ａは半球形となっている。この開閉弁１０４の位置だしは、図１４に示すように開閉弁１０４の外周面に設けられている４個の突起部１０４ｂが、開閉弁ホルダ１０５の内面に接触することで行っている。さらに、開閉弁１０４はバネ１１６によって弁体凸部１０３ａの先端部に押圧されており、通常はリリーフ流路１０３ｂを閉じている。
尚、弁体１０３は、ピストンロッド部１１０とピストン部１０３ｃと弁体凸部１０３ａからなっている。 FIG. 13 shows an example of the internal structure of a conventional pressure reducing valve (pressure reducing mechanism) 120 that is an enlarged portion A in FIG. The on-off valve 104 is pressed against the valve body 103 in the cylinder case 102 by a spring 106, the on-off valve recess 104a is conical, and the valve body protrusion 103a is hemispherical. The position of the on-off valve 104 is determined by the four protrusions 104b provided on the outer peripheral surface of the on-off valve 104 contacting the inner surface of the on-off valve holder 105 as shown in FIG. Further, the on-off valve 104 is pressed against the tip of the valve body convex portion 103a by a spring 116, and normally closes the relief flow path 103b.
The valve body 103 includes a piston rod portion 110, a piston portion 103c, and a valve body convex portion 103a.

特開２０００−２６３４６６号公報JP 2000-263466 A

図１２に示すように、取付ネジ部１０９はテ−パネジを使用しているため、従来の減圧弁付空気釘打機では、減圧機構部（以後減圧弁という）１２０の取付位置が取付ネジ部１０９と釘打機本体１５０のネジ部１５０ａの加工公差等によって、減圧弁１２０の取付寸法（Ｌ２寸法）がばらつくため、図１記載のＬ１寸法がばらついていた。さらに減圧弁１２０内の弁体１０３が釘打機本体１５０より外側部に配置されているため、本体から出る減圧弁の部分が大きくなるという欠点があった。 As shown in FIG. 12, since the attachment screw portion 109 uses a taper screw, in the conventional air nailer with pressure reducing valve, the attachment position of the pressure reducing mechanism portion (hereinafter referred to as pressure reducing valve) 120 is the attachment screw portion. 1 and the mounting dimension (L2 dimension) of the pressure reducing valve 120 vary due to processing tolerances of the screw part 150a of the nailing machine body 150 and the L1 dimension illustrated in FIG. Further, since the valve body 103 in the pressure reducing valve 120 is disposed outside the nailing machine main body 150, there is a disadvantage that a portion of the pressure reducing valve coming out of the main body becomes large.

さらに図１２〜１４に示す従来の開閉弁１０４は、弁体１０３の弁体凸部１０３ａの先端部への圧接性を良くするために外周面に突起部１０４ｂを設けて位置出しをしている。しかしこの突起部１０４ｂにより圧縮空気の流れる流路１１１が狭くなる問題がある。この流路１１１が狭くなってしまうと、釘打機本体１５０へ十分な空気が供給されず、連続打ちができなくなる等の弊害がある。
また、釘打機本体に、弁圧弁で設定した圧力以上の圧縮空気が供給されないようにすることである。 Further, the conventional on-off valve 104 shown in FIGS. 12 to 14 is positioned by providing a protrusion 104b on the outer peripheral surface in order to improve the pressure contact property of the valve body 103 to the tip of the valve body convex portion 103a. . However, there is a problem that the channel 111 through which the compressed air flows is narrowed by the protrusion 104b. If the flow path 111 becomes narrow, there is a problem that sufficient air is not supplied to the nail driver main body 150 and continuous hammering cannot be performed.
Another object of the present invention is to prevent the compressed air exceeding the pressure set by the valve pressure valve from being supplied to the nailing machine body.

上記課題は、減圧弁（減圧機構部）の釘打機本体への取り付けネジを平行ネジにし、減圧弁（減圧機構部）の弁体凸部と開閉弁凹部で開閉弁中心を出すようにして、且つ、開閉弁凹部円筒部に空気が通る溝を設けることにより解決する。 The above problem is that the screw for attaching the pressure reducing valve (pressure reducing mechanism) to the nailing machine body is a parallel screw, and the center of the opening / closing valve is brought out by the valve body convex part and the valve opening / closing concave part of the pressure reducing valve (pressure reducing mechanism part). And it solves by providing the groove | channel through which air passes in the opening-and-closing valve recessed part cylindrical part.

本発明は、できる限り小形であり、釘打機に十分な空気を供給し、リリーフ機能を確実に働かせることができる減圧弁を装着した空気釘打機を提供することができる。 The present invention can provide an air nailer equipped with a pressure reducing valve that is as small as possible, supplies a sufficient amount of air to the nailer, and can reliably operate the relief function.

図１〜１１を用いて本発明について説明する。 The present invention will be described with reference to FIGS.

図１に示すように、本発明の減圧弁付圧縮空気釘打機６０は、射出部５３にある図示されない釘を打ち出す図示されないピストンを内蔵したハウジング５１、ハウジング５１の下端から下向きに突出して装設され、図示しない釘が打ち出される射出部５３、ハウジング５１の略中央部に直交状に設けられたハンドル５７、ハンドル５７にほぼ平行に配置され、連結釘を収納し射出部５３内に釘を一本づつ供給するマガジン５２から構成されている。ハンドル５７の基部付近には釘打機本体５０の打込み動作を制御するトリガ５４が設けられている。 As shown in FIG. 1, a compressed air nail driver 60 with a pressure reducing valve according to the present invention includes a housing 51 containing a piston (not shown) for driving a nail (not shown) in an injection portion 53, and a projecting downward from the lower end of the housing 51. An injection portion 53 for driving a nail (not shown), a handle 57 provided orthogonally at a substantially central portion of the housing 51, and arranged substantially in parallel to the handle 57, accommodating a connecting nail and placing the nail in the injection portion 53 The magazine 52 is supplied one by one. A trigger 54 for controlling the driving operation of the nailing machine body 50 is provided near the base of the handle 57.

射出部５３の先端部５６を木材等に押しつけ、トリガ５４を引き操作すると、釘打機本体５０のハウジング５１内に配設されているシリンダー（図示せず）にハウジング５１内の圧縮空気が供給され、シリンダー内に配置されているピストン及びピストンに装設されたドライバービット（共に図示せず）が射出部５３内の釘を木材などに打ち付ける。尚、釘打機本体５０の駆動源となる圧縮空気はハンドル端面に配設されている減圧弁２０を介してコンプレッサー（空気圧縮機）等から供給される。 When the distal end portion 56 of the injection portion 53 is pressed against wood or the like and the trigger 54 is pulled, compressed air in the housing 51 is supplied to a cylinder (not shown) disposed in the housing 51 of the nailing machine body 50. A piston arranged in the cylinder and a driver bit (not shown) mounted on the piston hit the nail in the injection portion 53 against wood or the like. Compressed air serving as a drive source for the nailing machine body 50 is supplied from a compressor (air compressor) or the like via a pressure reducing valve 20 provided on the handle end face.

次に減圧弁について説明する。図２は減圧弁２０の断面図を表し、開閉弁ホルダ５内に配置された開閉弁４と該開閉弁４の下流側に配置され二次側の空気圧（流路３３を通過した圧縮空気の圧力）を受けて作動される弁体３を備えている。この弁体３の背面側に前記弁体３を付勢させる圧力調整バネ６が配置されている。また、開閉弁４開閉弁凹部４ａは弁体凸部３ａの先端部の一部を覆うようにかつ摺動可能に係合しており、さらにバネ１６によって押圧されているため、従来のように外周部に突起部を設ける必要が無く、流路１１を狭めることなく有効に使うことができる。尚、開閉弁４はバネ１６の押圧によってリリーフ流路を塞いでいる。 Next, the pressure reducing valve will be described. FIG. 2 shows a cross-sectional view of the pressure reducing valve 20. The on-off valve 4 disposed in the on-off valve holder 5 and the secondary air pressure (compressed air that has passed through the flow path 33) are arranged downstream of the on-off valve 4. And a valve body 3 that is actuated under pressure. A pressure adjustment spring 6 for biasing the valve body 3 is disposed on the back side of the valve body 3. The on-off valve 4 on-off valve recess 4a is slidably engaged so as to cover a part of the tip of the valve body convex portion 3a, and further pressed by the spring 16, so that There is no need to provide a projection on the outer periphery, and the channel 11 can be used effectively without narrowing. The on-off valve 4 closes the relief flow path by pressing the spring 16.

圧力調整バネ６を保持するアダプタ８は釘打機本体５０のエンドキャップ１に装着されている。アダプタ８のネジ９とエンドキャップ１のネジ１ａは平行ネジとなっており、間に空気漏れ防止のＯリング１０を設けて、エアー漏れを防いでいる。これにより、弁体３のピストンロッド部３ｅが釘打機本体５０のエンドキャップ１内部まで、移動することができ、これにより減圧弁２０を小型化することができる。 The adapter 8 that holds the pressure adjusting spring 6 is attached to the end cap 1 of the nailing machine body 50. The screw 9 of the adapter 8 and the screw 1a of the end cap 1 are parallel screws, and an O-ring 10 for preventing air leakage is provided between them to prevent air leakage. Thereby, the piston rod part 3e of the valve body 3 can move to the inside of the end cap 1 of the nail driver main body 50, and, thereby, the pressure reducing valve 20 can be reduced in size.

また、前記アダプタ８とシリンダケース２とは互いに設けられているネジ部４０で螺合しており、シリンダケース２を左右に回転させ、シリンダケース２の位置を変えることによって前記圧力調整バネ６の圧縮量（荷重）を変化させて前記弁体３に作用する二次側の空気圧を調整することができるようになっている。尚、シリンダケース２をエンドキャップ１側とは反対側に一杯に移動させた場合は図２のように二面幅部８ａへスパナ等の工具１３（厚さ約３ｍｍ）が入る余地があるが（エンドキャップ端面とシリンダケース２の端面の距離が約３.５ｍｍ）、シリンダケース２をエンドキャップ１側に一杯に移動させた場合は、図３に示すように、本体へ取り付ける二面幅部８ａへスパナ等の工具が入る隙間１４が小さくなっており（エンドキャップ端面とシリンダケース２の端面の距離が約１ｍｍ）、極限まで減圧弁の全長を短くしていることを表している。これにより、さらに減圧弁を小型化することができ、しいては釘打機のＬ１の寸法を小さくすることができ、減圧弁付圧縮空気釘打機の操作性の向上が図れる。 The adapter 8 and the cylinder case 2 are screwed together by screw portions 40 provided to each other, and the cylinder case 2 is rotated left and right to change the position of the cylinder case 2 so that the pressure adjusting spring 6 The secondary air pressure acting on the valve body 3 can be adjusted by changing the compression amount (load). When the cylinder case 2 is moved fully to the side opposite to the end cap 1 side, there is room for a tool 13 (thickness of about 3 mm) such as a spanner to enter the two-surface width portion 8a as shown in FIG. (The distance between the end cap end face and the end face of the cylinder case 2 is about 3.5 mm). When the cylinder case 2 is fully moved to the end cap 1 side, as shown in FIG. The gap 14 into which a tool such as a spanner enters 8a is small (the distance between the end cap end surface and the end surface of the cylinder case 2 is about 1 mm), which indicates that the total length of the pressure reducing valve is shortened to the limit. As a result, the pressure reducing valve can be further reduced in size, and the size of L1 of the nailer can be reduced, and the operability of the compressed air nailer with the pressure reducing valve can be improved.

減圧弁２０の動作を、図２、４、５、６を用いて説明する。開閉弁ホルダ５の右側開口部にコンプレッサーからホース等によって、圧縮空気が供給される（一次側の圧縮空気）。この供給された圧縮空気は、減圧弁２０の流路３１、流路１１、流路３３を通って弁体３のピストン部３ｃに供給される。このピストン部３ｃに供給された圧縮空気（二次側の圧縮空気）は流路３４、流路３５、流路３６を通って釘打機本体５０に供給される。 The operation of the pressure reducing valve 20 will be described with reference to FIGS. Compressed air is supplied from the compressor to the right opening of the on-off valve holder 5 by a hose or the like (primary compressed air). The supplied compressed air is supplied to the piston portion 3 c of the valve body 3 through the flow path 31, the flow path 11, and the flow path 33 of the pressure reducing valve 20. The compressed air (secondary compressed air) supplied to the piston portion 3c is supplied to the nailing machine body 50 through the flow path 34, the flow path 35, and the flow path 36.

ここで、釘打機本体５０の使用圧力が約０．７８ＭＰａ（８ｋｇｆ/ｃｍ^２）であった場合、減圧弁２０のシリンダケース２を回動し、圧力調整バネ６を調節し、０．７８ＭＰａ以上の圧力の圧縮空気が釘打機本体５０に供給されないように設定する。 Here, when the operating pressure of the nailing machine body 50 is about 0.78 MPa (8 kgf / cm ² ), the cylinder case 2 of the pressure reducing valve 20 is rotated, and the pressure adjusting spring 6 is adjusted to 0.78 MPa. It sets so that the compressed air of the above pressure may not be supplied to the nail driver main body 50. FIG.

これにより、コンプレッサーから供給される圧縮空気が、２．９ＭＰａ（３０ｋｇｆ/ｍｍ^２）であった場合でも、減圧弁２０に供給された圧縮空気は流路３１、１１、３３を通って、弁体３のピストン部３ｃに供給される。さらに、圧縮空気は流路３４、３５、３６を通って釘打機本体５０内に供給される。 Thereby, even when the compressed air supplied from the compressor is 2.9 MPa (30 kgf / mm ² ), the compressed air supplied to the pressure reducing valve 20 passes through the flow passages 31, 11, 33, and the valve body. 3 is supplied to the piston portion 3c. Further, the compressed air is supplied into the nailer body 50 through the flow paths 34, 35 and 36.

釘打機本体５０内が使用圧力になると、ピストン部３ｃにかかる圧縮空気の圧力により、弁体３を圧力調整バネ６の荷重に逆らって移動し、図４に示すシリンダケース２のシール面２ｂ開閉弁４のシール面４ａとが、図６に示すようにバネ１６によって開閉弁４のシール面４ａとシリンダケース２のシール面２ａが当接し、釘打機本体５０内に圧縮空気が供給されなくなる。 When the inside of the nailing machine body 50 reaches the working pressure, the valve body 3 is moved against the load of the pressure adjusting spring 6 by the pressure of the compressed air applied to the piston portion 3c, and the seal surface 2b of the cylinder case 2 shown in FIG. As shown in FIG. 6, the seal surface 4 a of the on-off valve 4 and the seal surface 2 a of the cylinder case 2 come into contact with the seal surface 4 a of the on-off valve 4 by a spring 16, and compressed air is supplied into the nail driver main body 50. Disappear.

尚、釘打機本体５０内の圧縮空気が消費されると、ピストン部３ｃにかかる圧力（荷重）が無くなるもしくは低くなる為、弁体３は圧力調整バネ６の力によって、開閉弁４を押上げ、再び圧縮空気が供給される。
上記作動を繰り返すことによって、一次側（コンプレッサ側）に供給された高圧の圧縮空気が、二次側の釘打機本体に適切な作動圧力の圧縮空気が供給される。 When the compressed air in the nail driver main body 50 is consumed, the pressure (load) applied to the piston portion 3 c disappears or decreases, so that the valve body 3 pushes the on-off valve 4 by the force of the pressure adjustment spring 6. The compressed air is supplied again.
By repeating the above operation, high-pressure compressed air supplied to the primary side (compressor side) is supplied to the secondary nailing machine main body and compressed air having an appropriate operating pressure.

しかし、万が一開閉弁４のシール面４ａ又はシリンダケース２のシール面２ａに傷が付いたり異物がはさまる等して釘打機本体５０（二次側）に設定以上の空気が供給された場合、図７，８に示すように、弁体３のピストン部３ｃに高い空気圧が更に加わり、弁体３をさらに後退させ、弁体凸部３ａと開閉弁凹部４ａとの係合が完全に離れると、釘打機に供給された二次側の空気が流路３６、３５、３４、３３、リリーフ流路３ｂを通って、リリーフ穴２ａから大気中に放出され、釘打機本体の異常な圧力上昇を防止する。ただし、上記構造の開閉弁４では、開閉弁４にかかる圧縮空気の圧力１２により、弁体凸部３aの外周部と開閉弁凹部４ａの内周面が密着してしまうため、係合が完全に外れるまで圧縮空気を逃がすことができないため、設定圧以上の圧縮空気を迅速に逃がすことができない。 However, in the unlikely event that the seal surface 4a of the on-off valve 4 or the seal surface 2a of the cylinder case 2 is scratched or foreign matter gets stuck, etc., air exceeding the set value is supplied to the nailing machine body 50 (secondary side) As shown in FIGS. 7 and 8, when high air pressure is further applied to the piston portion 3c of the valve body 3, the valve body 3 is further retracted, and the engagement between the valve body convex portion 3a and the on-off valve concave portion 4a is completely separated. The secondary air supplied to the nailer is discharged into the atmosphere from the relief hole 2a through the flow paths 36, 35, 34, 33 and the relief flow path 3b. Prevent the rise. However, in the on-off valve 4 with the above structure, the outer peripheral portion of the valve body convex portion 3a and the inner peripheral surface of the on-off valve concave portion 4a are brought into close contact with each other by the pressure 12 of the compressed air applied to the on-off valve 4, so Since the compressed air cannot be released until the pressure is released, the compressed air exceeding the set pressure cannot be quickly released.

そこで、釘打機本体の設定圧以上の圧力上昇の防止を感度良く制御するために、減圧弁２０に、図９、１０、１１に示すように開閉弁凹部４ａの側面にリリーフ溝７を設ける。これにより、弁体凸部３aの端面３ｄが開閉弁凹部４ａの低部４ｂから離れた瞬間に、釘打機側の圧縮空気が設定圧以上になった場合にリリーフ溝７、リリーフ流路３ｂを通って、リリーフ穴２ａから大気中に放出され、釘打機本体の異常な圧力上昇を感度良く防止することができる。 Therefore, in order to control with high sensitivity the prevention of the pressure rise above the set pressure of the nailing machine body, the pressure reducing valve 20 is provided with a relief groove 7 on the side surface of the on-off valve recess 4a as shown in FIGS. . As a result, when the compressed air on the nailing machine side exceeds the set pressure at the moment when the end surface 3d of the valve body convex portion 3a is separated from the low portion 4b of the on-off valve concave portion 4a, the relief groove 7 and the relief flow path 3b Through the relief hole 2a, it is discharged into the atmosphere, and an abnormal pressure rise in the nailing machine body can be prevented with high sensitivity.

本発明の減圧弁付空気釘打機の一実施例を示す図。The figure which shows one Example of the air nailer with a pressure-reduction valve of this invention. 本発明の減圧弁の断面図。Sectional drawing of the pressure-reduction valve of this invention. 本発明の減圧弁の断面図。Sectional drawing of the pressure-reduction valve of this invention. 図１のＡ部拡大図。The A section enlarged view of FIG. 図４のＢ−Ｂ線断面図。BB sectional drawing of FIG. 本発明の減圧弁が動作した状態を示す、断面図。Sectional drawing which shows the state which the pressure reducing valve of this invention operated. 本発明の減圧弁のリリーフ動作状態を示す図。The figure which shows the relief operation state of the pressure-reduction valve of this invention. 図７のＡ部拡大図。The A section enlarged view of FIG. 本発明の他の実施例を示す部分拡大図。The elements on larger scale which show the other Example of this invention. 図９のＢ−Ｂ断面図。BB sectional drawing of FIG. 本発明の他の実施例の減圧弁のリリーフ動作状態を示す図。The figure which shows the relief operation state of the pressure reducing valve of the other Example of this invention. 従来技術の減圧弁の一実施例を示す断面図。Sectional drawing which shows one Example of the pressure-reduction valve of a prior art. 図１２のＡ部拡大図。The A section enlarged view of FIG. 図１３のＢ−Ｂ断面図。BB sectional drawing of FIG.

Explanation of symbols

１は空気釘打機本体のエンドキャップ、２はシリンダケース、２ａはリリーフ穴、３は弁体、３ａは弁体凸部、３ｂはリリーフ流路、４は開閉弁、４ａは開閉弁凹部、４ｂは開閉弁凹部底面、５は開閉弁ホルダ、６は圧力調整バネ、７はリリーフ溝、８はアダプタ、９は平行ネジ、１０はＯリング、１１は流路、１２は圧縮空気の圧力（一次側空気圧）、１３はスパナ、１４は取り付け工具が入る隙間、２０は減圧弁、５０は釘打機本体、６０は減圧弁付圧縮空気釘打機。
1 is an end cap of an air nailer body, 2 is a cylinder case, 2a is a relief hole, 3 is a valve body, 3a is a valve body convex part, 3b is a relief flow path, 4 is an on-off valve, 4a is an on-off valve concave part, 4b is an opening / closing valve recess bottom, 5 is an opening / closing valve holder, 6 is a pressure adjusting spring, 7 is a relief groove, 8 is an adapter, 9 is a parallel screw, 10 is an O-ring, 11 is a flow path, and 12 is the pressure of compressed air ( (Primary air pressure), 13 is a spanner, 14 is a clearance for the installation tool, 20 is a pressure reducing valve, 50 is a nailing machine body, and 60 is a compressed air nailing machine with a pressure reducing valve.

Claims

An air nailing machine that is mounted on a compressed air supply system dedicated to high pressure and is equipped with a pressure reducing valve that can be operated in the normal pressure range and is driven at normal pressure. The valve body and a front surface of the valve body are provided with a convex portion, the valve body convex portion is brought into contact with the on-off valve concave portion, and the valve body and the on-off valve are interlocked to each other. A relief passage communicating from the valve body to the back surface of the valve body and a passage penetrating from the front surface of the valve body to the end face of the piston rod on the back surface, a pressure adjusting spring is disposed on the back surface side of the valve body, and the cylinder case is rotated. Thus, the secondary pressure can be adjusted by changing the compression amount of the pressure adjusting spring, the mounting screw to the adapter body is a parallel screw, and an O-ring is provided between the adapter and the nailing machine body. The piston rod is inside the main body. Air nailer with pressure reducing valve, characterized in that it has to be configured in.

An air nailing machine with a pressure reducing valve, wherein a groove through which air passes is provided in the pressure reducing valve opening / closing valve recess.