JPS629861A - Control device for rotary speed of pneumatically driven rotary machine - Google Patents

Control device for rotary speed of pneumatically driven rotary machine

Info

Publication number
JPS629861A
JPS629861A JP14663985A JP14663985A JPS629861A JP S629861 A JPS629861 A JP S629861A JP 14663985 A JP14663985 A JP 14663985A JP 14663985 A JP14663985 A JP 14663985A JP S629861 A JPS629861 A JP S629861A
Authority
JP
Japan
Prior art keywords
air
speed
control device
rotating device
rotary
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP14663985A
Other languages
Japanese (ja)
Other versions
JPH0226683B2 (en
Inventor
Soichi Kumegawa
粂川 壯一
Akira Sugimoto
旭 杉本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ROUDOUSHIYOU SANGYO ANZEN KENKYUSHO
Original Assignee
ROUDOUSHIYOU SANGYO ANZEN KENKYUSHO
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ROUDOUSHIYOU SANGYO ANZEN KENKYUSHO filed Critical ROUDOUSHIYOU SANGYO ANZEN KENKYUSHO
Priority to JP14663985A priority Critical patent/JPS629861A/en
Publication of JPS629861A publication Critical patent/JPS629861A/en
Publication of JPH0226683B2 publication Critical patent/JPH0226683B2/ja
Granted legal-status Critical Current

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  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

PURPOSE:To enable a rotary machine to hold a fixed rotary speed even for a change in a load and original pressure of air, by providing a tachometer generator and an air flow regulating valve, in the case of a rotary speed control device for the pneumatically driven rotary machine of an air grinder or the like. CONSTITUTION:A control device, connecting a speedometer generator (tachometer generator) 2 with a pneumatically driven rotary machine 1 of air grinder or the like, provides an air flow regulating valve 3 between an air supply source 4 and the rotary machine 1. This air flow regulating valve 3, increasing its opening while a flow of air when a speed of the rotary machine 1 is lower than the rated speed with said speed of the machine in a control start speed or more while decreasing the opening and the flow of air when the speed of the machine increases higher than the rated speed, controls the flow of air, supplied to the rotary machine 1 by an output signal S of the tachometer generator 2, so as to hold the rated speed. In this way, the rotary speed control device, corresponding to a change in a load and the original pressure while eliminating any necessity for an external power supply, is formed in small size and light weight.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、圧搾空気により駆動されて回転される空気式
回転装置の回転数を制御する回転数制御装置に係り、特
にエア・グラインダ、エア・サンダ等の携帯用空気式回
転装置に対し好適な回転数制御装置に関する。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotation speed control device for controlling the rotation speed of a pneumatic rotating device that is rotated by being driven by compressed air, and in particular to an air grinder, an air sander, etc. This invention relates to a rotation speed control device suitable for portable pneumatic rotation devices such as the above.

従来の技術 エア・グラインダ、エア・サンダ等の空気式回転装置は
、一般に、その回転数が所定の速度より低くなると、所
定の性能を発揮することができなくなるし、逆に回転数
が所定の速度より高くなると、安全上問題を生じる。
Conventional technology Pneumatic rotating devices such as air grinders and air sanders are generally unable to exhibit the specified performance when the rotation speed becomes lower than a predetermined speed, and conversely, when the rotation speed becomes lower than a predetermined speed, If the speed is higher than that, it will pose a safety problem.

例えば、エア・グラインダの場合、装着されている研削
研石の回転速度が所定速度より低下すると、研削性能が
低下してしまい、所定の研削性能を得られない。また、
逆に、回転速度が定格速度(無負荷回転数)より高くな
ると、装着されている研削研石に発生する遠心応力が回
転速度の上昇率の二乗の割合で増大して、研削研石が破
壊する虞が生じ、非常に危険な状態となる。
For example, in the case of an air grinder, if the rotational speed of the attached grinding stone falls below a predetermined speed, the grinding performance decreases and the predetermined grinding performance cannot be obtained. Also,
Conversely, when the rotational speed becomes higher than the rated speed (no-load rotation speed), the centrifugal stress generated in the attached grinding stone increases at the square of the rate of increase in rotational speed, causing the grinding stone to break. There is a risk that this will occur, resulting in an extremely dangerous situation.

事実、エア・グラインダの研削研石の破壊事故のうちの
70%以上が、研削研石の最高使用周速度を越えた回転
速度のグラインダに研削研石が装着されていたという状
況がある。
In fact, in more than 70% of air grinder grinding stone destruction accidents, the grinding stone was attached to a grinder whose rotational speed exceeded the maximum circumferential speed of the grinding stone.

したがって、エア・グラインダの研削性能保持のために
は勿論のこと、グラインダ作業の安全化のためにも、エ
ア・グラインダの回転数を所定の速度に制御保持する必
要がある。
Therefore, it is necessary to control and maintain the rotational speed of the air grinder at a predetermined speed not only to maintain the grinding performance of the air grinder but also to ensure safety of the grinder operation.

同様にして、他の空気式回転装置においても、一般に、
その回転速度を所定速度に制御保持することが望ましい
Similarly, in other pneumatic rotating devices, generally
It is desirable to control and maintain the rotational speed at a predetermined speed.

しかるに、実際には、エア・グラインダ(携帯用空気式
研削盤〉の場合には、グラインダ作業の安全化のため、
研削盤等構造規格(昭和46年労働省告示第8号)で、
負荷の如何にかかわらず回転数を一定に保持するため、
自動的に空気量を調整する調速機(ガバナー)を備える
ことが義務付けられているが、他の空気式回転装置では
、調速機構を何ら持たないものが多いのが現状である。
However, in reality, in the case of air grinders (portable pneumatic grinding machines), in order to make grinding work safer,
According to the structural standards for grinding machines, etc. (Ministry of Labor Notification No. 8 of 1971),
In order to keep the rotation speed constant regardless of the load,
Although it is mandatory to have a governor that automatically adjusts the amount of air, many other pneumatic rotating devices do not have any speed regulating mechanism at all.

また、従来のエア・グラインダに備え付けられていた前
記調速機は、構造から見て、 (a)空気通路の大きざを調整する調整弁を起動させる
原動力として重錘の遠心力を利用し、調速弁を元の位置
に戻すためにばねを用いる遠心力方式のもの、 (b)調速弁を起動させる原動力としてロータのトルク
(回転力)を利用し、調速弁を元の位置に戻すためにば
ねを用いるトルク方式のもの、の2種類に大別されるが
、これらはいずれも純機械式のもので、次項に述べるよ
うな大きな問題点があった。
Furthermore, from a structural point of view, the speed governor installed in conventional air grinders (a) uses the centrifugal force of a weight as a motive force to activate a regulating valve that adjusts the size of the air passage; A centrifugal force type that uses a spring to return the governor valve to its original position. (b) A centrifugal force type that uses the torque (rotational force) of the rotor as the driving force to start the governor valve, returning the governor valve to its original position. They are roughly divided into two types: torque-type ones that use a spring to return them, but all of these are purely mechanical types, and they have major problems as described in the next section.

発明が解決しようとする問題点 エア・グラインダの回転数変動の要因は、(イ)研削負
荷の変化、(ロ)装着している研削研石の消耗による負
荷の変化、(ハ〉供給される圧搾空気の元圧の変化等が
主なものである。
Problems to be Solved by the Invention The causes of variations in the rotational speed of an air grinder are (a) changes in the grinding load, (b) changes in the load due to wear and tear of the attached grinding stone, and (c) changes in the supplied grinding stone. The main causes include changes in the source pressure of compressed air.

しかるに、前記従来のエア・グラインダに装備されてい
る遠心力式およびトルク式の調速機は、何れも負荷が変
動した場合に自動的に空気量を調整して回転数を一定に
保持する機能を持つのみであり、供給される圧搾空気の
元圧が変化した場合には、回転数を一定に保持する機能
は持っていなかった。
However, the centrifugal force type and torque type speed governors installed in the conventional air grinders have the function of automatically adjusting the amount of air to maintain a constant rotation speed when the load fluctuates. However, if the original pressure of the compressed air to be supplied changes, it does not have the function of keeping the rotation speed constant.

したがって、前記元圧が上昇した場合には、研削研石の
回転速度が上昇し、研削研石が破壊する虞があり、また
前記元圧が低下した場合には、所定の性能が得られなく
なるという問題がめった。
Therefore, if the source pressure increases, the rotational speed of the grinding stone increases and there is a risk of the grinding stone being destroyed, and if the source pressure decreases, the desired performance may not be obtained. This problem happened very often.

発明の目的 本発明は、前記従来の問題点を解決するためになされた
もので、負荷が変化した場合のみならず、元圧が変化し
た場合も回転数を一定に保持することができ、しかも外
部電源を必要とせず、かつ小型軽量とすることができる
空気式回転装置の回転数制御装置を提供することを目的
とする。
OBJECT OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and is capable of keeping the rotational speed constant not only when the load changes but also when the source pressure changes. It is an object of the present invention to provide a rotation speed control device for a pneumatic rotating device that does not require an external power source and can be made small and lightweight.

問題点を解決するための手段 本発明による空気式回転装置の回転数制御装置は、空気
式回転装置の回転軸に接続され、該回転軸の回転数に応
じた電気信号を発生する速度計発電機と、空気供給源と
前記空気式回転装置との間に介在され、前記空気供給源
から前記空気式回転装置へ供給される空気の流量を前記
速度計発電機の出力に応じて調整する空気流量調整弁と
を有してなる。
Means for Solving the Problems The rotational speed control device for a pneumatic rotating device according to the present invention includes a speedometer generator connected to the rotating shaft of the pneumatic rotating device and generating an electric signal according to the rotational speed of the rotating shaft. air interposed between the air supply source and the pneumatic rotating device, and adjusting the flow rate of air supplied from the air supply source to the pneumatic rotating device according to the output of the speedometer generator. and a flow rate adjustment valve.

作用 本発明によれば、負荷の変動または空気供給源の元圧の
変動により、回転装置の回転数が定格回転数より上昇し
ようとすると、速度計発電機への入力回転数が上昇し、
空気流量調整弁より前記空気流量が減少されるので、回
転装置の回転数は定格回転数に維持され、逆に、回転装
置の回転数が定格回転数より低下しようとすると、速度
計発電機の入力回転数も減少し、空気流量調整弁が前記
空気流量を増大させるので、この場合もやはり回転装置
は定格回転数を維持する。
According to the present invention, when the rotational speed of the rotating device attempts to rise above the rated rotational speed due to load fluctuations or fluctuations in the source pressure of the air supply source, the input rotational speed to the speedometer generator increases,
Since the air flow rate is reduced by the air flow rate regulating valve, the rotation speed of the rotating device is maintained at the rated rotation speed, and conversely, when the rotation speed of the rotating device is about to drop below the rated rotation speed, the speed meter generator The input rotational speed also decreases and the air flow regulating valve increases the air flow, so that in this case too the rotating device maintains the rated rotational speed.

また、本発明によれば、回転装置の回転数を検出する手
段として速度計発電機を用いているので、回転装置の回
転数の検出のために外部電源を必要とすることがない。
Further, according to the present invention, since the speedometer generator is used as a means for detecting the rotation speed of the rotating device, an external power source is not required for detecting the rotation speed of the rotating device.

実施例 以下、本発明を図面に示す実施例に基づいて説明する。Example Hereinafter, the present invention will be explained based on embodiments shown in the drawings.

第1図は、本発明による回転数制御装置の一実施例を示
すブロック図である。1はエア・グラインダ、エア・サ
ンダ等の空気式回転装置である。
FIG. 1 is a block diagram showing an embodiment of a rotation speed control device according to the present invention. 1 is a pneumatic rotating device such as an air grinder or an air sander.

2は入力回転数に応じた電圧またはパルス等の電気信号
を発生する速度計発電機(タコ・ジェネレータ)であり
、空気式回転装置1の回転軸(図示せず)に直接または
間接的に接続されている。
2 is a speedometer generator (tacho generator) that generates electrical signals such as voltage or pulses according to the input rotation speed, and is connected directly or indirectly to the rotating shaft (not shown) of the pneumatic rotating device 1. has been done.

3は空気流量調整弁であり、空気供給!4と回転装置1
との間に介在されており、速度計発電機2の出力電気信
号Sに応じて空気供給源4から回転装置1へ供給される
空気流量を制御するようになっている。ざらに詳しく言
うと、この空気流量調整弁3は、回転装置1の回転が所
定の制御開始回転数(例えば、定格回転数の50%)に
達するまでは、一定の開度を維持して空気供給源4から
回転装置1へ供給される空気の流量を制御しないが、回
転装置1の回転数が前記制御開始回転数に達した後は、
電気信@Sに応答することにより、該回転装置1の回転
数が前記制御開始回転数以上で定格回転数より低いとき
は、前記空気流量が増大するようにその開度を増大する
一方、回転装置1の回転数が定格回転数より高くなった
ときは、前記空気流量が減少するようにその開度を減少
する。
3 is the air flow rate adjustment valve, which supplies air! 4 and rotating device 1
The air flow rate supplied from the air supply source 4 to the rotating device 1 is controlled in accordance with the output electric signal S of the speedometer generator 2. To be more specific, the air flow rate regulating valve 3 maintains a constant opening until the rotation of the rotating device 1 reaches a predetermined control start rotation speed (for example, 50% of the rated rotation speed) to supply air. Although the flow rate of air supplied from the supply source 4 to the rotating device 1 is not controlled, after the rotational speed of the rotating device 1 reaches the control start rotational speed,
In response to the electric signal @S, when the rotation speed of the rotating device 1 is equal to or higher than the control start rotation speed and lower than the rated rotation speed, the opening degree is increased so that the air flow rate increases, and the rotation speed is increased. When the rotational speed of the device 1 becomes higher than the rated rotational speed, the degree of opening is reduced so that the air flow rate is reduced.

本制御装置は、以上のような構成を有しているので、負
荷の変動または空気供給源4の元圧Pの変動により、回
転装置1の回転数が定格回転数より上昇しようとすると
、速度計発電@2への入力回転数が上昇し、空気流量調
整弁3より前記空気流量が減少されるため、回転装置1
の回転数は定格回転数に維持され、逆に、回転装置1の
回転数が定格回転数より低下しようとすると、速度計発
電機20入力回転数も減少し、空気流量調整弁3が前記
空気流量を増大させるため、この場合もやはり回転装置
1は定格回転数を維持する。
Since this control device has the above configuration, if the rotation speed of the rotating device 1 attempts to rise above the rated rotation speed due to a change in load or a change in the source pressure P of the air supply source 4, the speed The input rotational speed to the meter power generation@2 increases, and the air flow rate is reduced by the air flow rate regulating valve 3, so that the rotating device 1
The rotational speed of the rotating device 1 is maintained at the rated rotational speed, and conversely, when the rotational speed of the rotating device 1 is about to decrease below the rated rotational speed, the input rotational speed of the speedometer generator 20 also decreases, and the air flow rate regulating valve 3 In order to increase the flow rate, the rotating device 1 maintains the rated rotational speed in this case as well.

ところで、空気式回転装置の1つの大きな長所は、外部
電源が不要でかつ小型軽量とすることができるというこ
とでおり、特にこれらのことは、エア・グラインダ、エ
ア・サンプ等の携帯式空気式回転装置においては極めて
重要なことでおる。
By the way, one of the great advantages of pneumatic rotating devices is that they do not require an external power source and can be made small and lightweight. This is extremely important in rotating equipment.

ここにおいて、本制御装置は、回転装置1の回転数を検
出する手段として速度計発電機2を用いているので、回
転装置1の回転数を検出のために外部電源を必要とする
ことがないため、外部電源が不要であるという空気式回
転装置の長所を損うことなく、前述のように空気式回転
装置の回転数を制御することができ、しかも小型軽量と
することができる。よって、エア・グラインダ、エア・
サンプ等の携帯式空気式回転装置に特に好適である。
Here, since this control device uses the speedometer generator 2 as a means for detecting the rotation speed of the rotation device 1, an external power source is not required for detecting the rotation speed of the rotation device 1. Therefore, the rotation speed of the pneumatic rotating device can be controlled as described above without sacrificing the advantage of the pneumatic rotating device that an external power source is not required, and the pneumatic rotating device can be made smaller and lighter. Therefore, air grinder, air
It is particularly suitable for portable pneumatic rotating devices such as sump.

発明の効果 以上のように本発明による空気式回転装置の回転数制御
装置は、 (i)負荷が変化した場合のみならず、空気供給源の元
圧が変化した場合にも回転数を一定に保持することがで
きる。
Effects of the Invention As described above, the rotation speed control device for a pneumatic rotating device according to the present invention is capable of (i) keeping the rotation speed constant not only when the load changes but also when the source pressure of the air supply source changes; can be retained.

(11)外部電源を必要とせず、かつ小型軽量とするこ
とができる。
(11) No external power source is required, and the device can be made small and lightweight.

という優れた効果を得られるものである。This provides an excellent effect.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明による空気式回転装置の回転数制御装置
の一実施例を示すブロック図である。 1・・・空気式回転装置、2・・・速度計発電機、3・
・・空気流量調整弁、4・・・空気供給源。 特許出願人  労働省産業安全研究所長第1図
FIG. 1 is a block diagram showing an embodiment of a rotation speed control device for a pneumatic rotating device according to the present invention. 1... Pneumatic rotating device, 2... Speedometer generator, 3...
...Air flow rate adjustment valve, 4...Air supply source. Patent applicant: Director, Industrial Safety Research Institute, Ministry of Labor Figure 1

Claims (1)

【特許請求の範囲】[Claims] 空気式回転装置の回転軸に接続され、該回転軸の回転数
に応じた電気信号を発生する速度計発電機と、空気供給
源と前記空気式回転装置との間に介在され、前記空気供
給源から前記空気式回転装置へ供給される空気の流量を
前記速度計発電機の出力に応じて調整する空気流量調整
弁とを有してなる空気式回転装置の回転数制御装置。
a speedometer generator connected to the rotating shaft of the pneumatic rotating device and generating an electrical signal according to the rotational speed of the rotating shaft; and a speedometer generator interposed between an air supply source and the pneumatic rotating device, the air supply A rotation speed control device for a pneumatic rotating device, comprising an air flow rate adjustment valve that adjusts a flow rate of air supplied from a source to the pneumatic rotating device in accordance with an output of the speedometer generator.
JP14663985A 1985-07-05 1985-07-05 Control device for rotary speed of pneumatically driven rotary machine Granted JPS629861A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14663985A JPS629861A (en) 1985-07-05 1985-07-05 Control device for rotary speed of pneumatically driven rotary machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14663985A JPS629861A (en) 1985-07-05 1985-07-05 Control device for rotary speed of pneumatically driven rotary machine

Publications (2)

Publication Number Publication Date
JPS629861A true JPS629861A (en) 1987-01-17
JPH0226683B2 JPH0226683B2 (en) 1990-06-12

Family

ID=15412271

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14663985A Granted JPS629861A (en) 1985-07-05 1985-07-05 Control device for rotary speed of pneumatically driven rotary machine

Country Status (1)

Country Link
JP (1) JPS629861A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113006875A (en) * 2021-03-24 2021-06-22 佛山玄同科技有限公司 Pressure energy recovery system and grid connection method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5950666U (en) * 1982-09-24 1984-04-03 株式会社東洋空機製作所 Air grinder rotation speed control device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5950666B2 (en) * 1981-01-20 1984-12-10 三井東圧化学株式会社 Method for purifying methacrylamide

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5950666U (en) * 1982-09-24 1984-04-03 株式会社東洋空機製作所 Air grinder rotation speed control device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113006875A (en) * 2021-03-24 2021-06-22 佛山玄同科技有限公司 Pressure energy recovery system and grid connection method
CN113006875B (en) * 2021-03-24 2022-01-04 佛山玄同科技有限公司 Pressure energy recovery system and grid connection method

Also Published As

Publication number Publication date
JPH0226683B2 (en) 1990-06-12

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