JPH0561505U - Safety device against rising drain pressure of running motor - Google Patents

Safety device against rising drain pressure of running motor

Info

Publication number
JPH0561505U
JPH0561505U JP781692U JP781692U JPH0561505U JP H0561505 U JPH0561505 U JP H0561505U JP 781692 U JP781692 U JP 781692U JP 781692 U JP781692 U JP 781692U JP H0561505 U JPH0561505 U JP H0561505U
Authority
JP
Japan
Prior art keywords
pressure
switching valve
pilot
drain
traveling motor
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.)
Pending
Application number
JP781692U
Other languages
Japanese (ja)
Inventor
哲郎 吉本
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.)
Sumitomo SHI Construction Machinery Co Ltd
Original Assignee
Sumitomo SHI Construction Machinery Co Ltd
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 Sumitomo SHI Construction Machinery Co Ltd filed Critical Sumitomo SHI Construction Machinery Co Ltd
Priority to JP781692U priority Critical patent/JPH0561505U/en
Publication of JPH0561505U publication Critical patent/JPH0561505U/en
Pending legal-status Critical Current

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  • Fluid-Pressure Circuits (AREA)
  • Component Parts Of Construction Machinery (AREA)

Abstract

(57)【要約】 【目的】 大型クロ−ラクレ−ン等の走行モ−タのドレ
ン圧力が上昇することによる走行モ−タの破損を防止す
る装置を提供することを目的とする。 【構成】 走行モ−タのドレンライン11に圧力検出用
圧力スイッチ2を設け、又方向切換弁5のパイロットラ
インに電磁切換弁6a,6bを設けて前記圧力スイッチ2の
「入」・「切」によりパイロットラインを切換えるよう
にし、さらに前記方向切換弁5と電磁切換弁6a,6bとの
間のパイロットラインにそれぞれスロ−リタ−ン弁7a,
7bを設けて方向切換弁切換時のパイロット圧を緩やかに
逃がすようにした。
(57) [Summary] [Purpose] An object of the present invention is to provide a device for preventing damage to a traveling motor due to an increase in drain pressure of the traveling motor such as a large crawl crane. [Structure] A pressure switch 2 for detecting pressure is provided on a drain line 11 of a traveling motor, and electromagnetic switching valves 6a and 6b are provided on a pilot line of a directional switching valve 5, so that the pressure switch 2 is turned on / off. The pilot lines are switched by means of the ".", And the slow return valves 7a, 7a, 7b are respectively connected to the pilot lines between the directional switching valve 5 and the electromagnetic switching valves 6a, 6b.
7b is provided so that the pilot pressure at the time of switching the direction switching valve can be released gently.

Description

【考案の詳細な説明】[Detailed description of the device]

【0001】[0001]

【産業上の利用分野】[Industrial applications]

本考案は建設機械等における走行モ−タのドレン圧力上昇による破損を防止す る安全装置に関するものである。 The present invention relates to a safety device for preventing damage due to an increase in drain pressure of a traveling motor in a construction machine or the like.

【0002】[0002]

【従来の技術】[Prior Art]

例えば大型クロ−ラクレ−ンの輸送は、輸送重量の関係上、走行モ−タの付い ている下部走行体と上部旋回体を分割して輸送する。この為輸送後の組立時に、 走行モ−タ用の配管を継ぐ必要がある。配管の継ぎ部はセルフシ−ルカップリン グとなっており、下部走行体の走行モ−タ入口ポ−ト、出口ポ−ト及びドレンポ −トと上部旋回体間をつなぐ必要がある。ところがドレンラインを継ぎ忘れたり 、或いは継いだつもりでもセルフシ−ルカップリングが入っていなかったりする と、走行モ−タが駆動することによってドレンラインに油が流れ、ドレン圧力が 上昇し、走行モ−タ1内のシ−ル等を破損させることがある。 For example, in the case of transportation of a large-sized crawl crane, the lower traveling structure with the traveling motor and the upper revolving structure are divided and transported in terms of transportation weight. Therefore, when assembling after transportation, it is necessary to connect the piping for the running motor. The joints of the pipes are self-sealing, and it is necessary to connect the running motor inlet port, outlet port and drain port of the lower traveling unit and the upper revolving unit. However, if you forget to connect the drain line, or if you do not have the self-sealing coupling even if you intend to connect it, oil will flow to the drain line due to the driving of the running motor, and the drain pressure will rise and the running mode will increase. -The seal in the motor 1 may be damaged.

【0003】[0003]

【考案が解決しようとする課題】[Problems to be solved by the device]

このような走行モ−タのドレン圧力上昇による走行モ−タの破損を防止する装 置を提供することを目的とする。 It is an object of the present invention to provide a device that prevents damage to the running motor due to such an increase in drain pressure of the running motor.

【0004】[0004]

【課題を解決するための手段】[Means for Solving the Problems]

走行モ−タ1のドレンライン11に圧力検出用圧力スイッチ2を設け、又方向 切換弁5のパイロットラインに電磁切換弁6a,6bを設けて、前記圧力スイッチ2 の「入」・「切」によりパイロットラインを切換えるようにし、さらに前記方向 切換弁5と電磁切換弁6a,6bとの間のパイロットラインにそれぞれスロ−リタ− ン弁7a,7bを設けて方向切換弁切換時のパイロット圧を緩やかに逃がすようにし た。 又運転室内に異常を知らせるランプ16を取付け、圧力スイッチ2の作動でリ レ−15b を閉じてランプ16を点滅させて確認できるようにした。 The pressure switch 2 for detecting pressure is provided in the drain line 11 of the traveling motor 1, and the electromagnetic switching valves 6a and 6b are provided in the pilot line of the direction switching valve 5, so that the pressure switch 2 is turned on / off. The pilot line is switched by means of the above, and the pilot lines between the directional control valve 5 and the electromagnetic directional control valves 6a, 6b are provided with slow return valves 7a, 7b, respectively, so that the pilot pressure when switching the directional control valve I let it escape gently. Further, a lamp 16 for notifying an abnormality is installed in the driver's cab, and the relay 15b is closed by the operation of the pressure switch 2 so that the lamp 16 can be blinked for confirmation.

【0005】[0005]

【実施例】【Example】

図1と図2を用いて説明する。図1で10はタンクである。ポンプ8によりタ ンク10から油を吸い込んで油圧を吐出す。5は圧油の方向を切換える方向切換 弁で、上部旋回体と下部走行体間はセンタ−ジョイント3とによって継がれてい る。1は下部走行体を駆動する走行モ−タである。圧油ラインはセルフシ−ルカ ップリング4a,4bで接離可能に連結されている。 This will be described with reference to FIGS. 1 and 2. In FIG. 1, 10 is a tank. The pump 8 sucks oil from the tank 10 and discharges hydraulic pressure. Reference numeral 5 is a direction switching valve that switches the direction of pressure oil, and the upper revolving structure and the lower traveling structure are connected by a center joint 3. Reference numeral 1 is a traveling motor for driving the lower traveling body. The pressure oil lines are connected by self-sealing couplings 4a and 4b so that they can be connected and disconnected.

【0006】 又走行モ−タ1のドレンライン11には走行モ−タ1とセルフシ−ルカップリ ング4cとの間に所定の設定圧力になるとスイッチが開くB接形の圧力スイッチ2 が配設されている。9はリモコン弁で、方向切換弁5のパイロット室5aとの間に 電磁切換弁6aが配設されている。電磁切換弁6aは圧力スイッチ2の「入」・「切」に よって切換わるリレ−の接点15a の一方が電磁切換弁6aのコイル部に、他方が電 源13のプラス側につながっている。Further, a drain switch 11 of the traveling motor 1 is provided between the traveling motor 1 and the self-sealing coupling 4c, and a B-contact type pressure switch 2 is opened to open the switch when a predetermined set pressure is reached. ing. A remote control valve 9 is provided with an electromagnetic switching valve 6a between the direction switching valve 5 and the pilot chamber 5a. In the electromagnetic switching valve 6a, one of contacts 15a of a relay that is switched by turning on / off the pressure switch 2 is connected to a coil portion of the electromagnetic switching valve 6a, and the other is connected to a positive side of the power source 13.

【0007】 方向切換弁5と電磁切換弁6a,6bの間にはスロ−リタ−ン弁7a,7bが配設され ており、方向切換弁5のパイロット室5a,5bへは速く圧油が入り、パイロット室 5a,5bからタンク10へは絞りにより圧油がゆっくりと流れる様になっている。Slow return valves 7a and 7b are arranged between the directional control valve 5 and the electromagnetic directional control valves 6a and 6b, and pressure oil is quickly supplied to the pilot chambers 5a and 5b of the directional control valve 5. The pressure oil flows slowly from the pilot chambers 5a and 5b into the tank 10 by the throttle.

【0008】 走行モ−タ1内には暴走防止用にカウンタ−バランス弁12が内蔵されている 。又圧力スイッチ2の電気信号を上部旋回体へ導く為にスリップリング14を設 けてあり、圧力スイッチ2の「入」・「切」で作動するリレ−15とこのリレ− 15の接点15b で点滅するランプ16より構成されている。ランプ16はオペレ −タにわかる様に、運転室内に取付けられている(図2)。A counter balance valve 12 is incorporated in the traveling motor 1 to prevent runaway. In addition, a slip ring 14 is provided to guide the electric signal of the pressure switch 2 to the upper revolving structure, and a relay 15 that operates by turning the pressure switch 2 "on" and "off" and a contact 15b of the relay 15 are provided. It is composed of a blinking lamp 16. The lamp 16 is installed in the operator's cab as seen by the operator (Fig. 2).

【0009】[0009]

【作動】[Operation]

ポンプ8によって発生した圧油は方向切換弁5へ導かれるが、リモコン弁9が 中立の時はタンク10へ流れ走行モ−タ1は動かない。今リモコン弁9のレバ− 9aを前進に動かし、パイロット圧を発生させる。するとパイロット圧は電磁切換 弁6aへ導かれるが、走行モ−タ1にはポンプ8からの圧油がまだ導かれていない 為にドレン圧力は0である。従って圧力スイッチ2の接点2bは閉じてリレ−15 の接点15a も閉じており、電源13のプラス側が電磁切換弁6aのコイルに継がり 通電され図1のA位置に切換わる。電磁切換弁6aが切換るとリモコン弁9にて発 生したパイロット圧はスロ−リタン弁7aを通り方向切換弁5のパイロット室5aに 導かれ、方向切換弁を切換える。これによりポンプ8から吐出された圧油は、方 向切換弁5、センタ−ジョイント3、セルフシ−ルカップリング4b、カウンタ− バランス弁12を通り、走行モ−タ1に入って下部走行体が駆動される。 The pressure oil generated by the pump 8 is guided to the direction switching valve 5, but when the remote control valve 9 is neutral, it flows to the tank 10 and the traveling motor 1 does not move. Now, move the lever 9a of the remote control valve 9 forward to generate pilot pressure. Then, the pilot pressure is guided to the electromagnetic switching valve 6a, but the drain pressure is 0 because the pressure oil from the pump 8 has not yet been guided to the traveling motor 1. Therefore, the contact 2b of the pressure switch 2 is closed and the contact 15a of the relay 15 is also closed, and the positive side of the power source 13 is connected to the coil of the electromagnetic switching valve 6a to be energized and switched to the position A in FIG. When the electromagnetic switching valve 6a is switched, the pilot pressure generated by the remote control valve 9 is guided to the pilot chamber 5a of the directional switching valve 5 through the slow return valve 7a and switches the directional switching valve. As a result, the pressure oil discharged from the pump 8 passes through the direction switching valve 5, the center joint 3, the self-sealing coupling 4b, and the counter balance valve 12, enters the traveling motor 1, and the lower traveling body is Driven.

【0010】 今、ドレンライン11のセルフシ−ルカップリング4cがはずれていたとすると 、走行モ−タ1の駆動によってドレンライン11にモ−タの漏れ油が流れ込み、 ドレンライン内に圧力が発生する。この時圧力スイッチ2は走行モ−タ1の許容 ドレン圧力以下で作動する様に設定されており、この許容圧力以上になろうとす ると圧力スイッチ2の接点2bが開き、電磁切換弁6aのコイルを励磁している電源 13のプラス側が切れる。これにより電磁切換弁6aは切換わり、リモコン弁9か ら供給されるパイロット圧力が止まる。方向切換弁5のパイロット室5aの圧油は スロ−リタ−ン弁7aの絞りによって徐々にパイロット圧が逃げ、急に停止するこ とはない。しばらくして方向切換弁5は中立状態となって走行モ−タ1への圧油 供給が止まり、ドレンライン11の圧力は上昇しなくなる。If the self-sealing coupling 4c of the drain line 11 is now disengaged, the oil leaking from the motor flows into the drain line 11 due to the driving of the traveling motor 1, and a pressure is generated in the drain line. .. At this time, the pressure switch 2 is set to operate below the allowable drain pressure of the traveling motor 1, and if the pressure exceeds this allowable pressure, the contact 2b of the pressure switch 2 will open and the electromagnetic switching valve 6a will operate. The positive side of the power supply 13 exciting the coil is cut off. As a result, the electromagnetic switching valve 6a is switched, and the pilot pressure supplied from the remote control valve 9 is stopped. The pressure oil in the pilot chamber 5a of the direction switching valve 5 gradually escapes due to the throttle of the slow-return valve 7a, and does not stop suddenly. After a while, the directional control valve 5 becomes neutral and the pressure oil supply to the traveling motor 1 is stopped, and the pressure in the drain line 11 does not rise.

【0011】 圧力スイッチ2が働くと同時にリレ−15の接点15b が閉じてランプ16を点 灯させる。これによりドレンライン11に許容圧力以上のドレン圧が発生すると 下部走行体が自動停止して運転室内のランプ16が点灯し、オペレ−タに異常で あることを知らせる。At the same time that the pressure switch 2 operates, the contact 15b of the relay 15 closes and the lamp 16 is turned on. As a result, when a drain pressure higher than the allowable pressure is generated in the drain line 11, the lower traveling body automatically stops and the lamp 16 in the driver's cab lights up to inform the operator that there is an abnormality.

【0012】 一般的には外力によって走行モ−タ1が回される時にもドレン圧は発生するが 本回路ではカウンタ−バランス弁12があるので、外力によって走行モ−タ1が 駆動されることはなく、ドレン圧は発生しない。Generally, the drain pressure is generated even when the traveling motor 1 is rotated by an external force, but since the counter balance valve 12 is provided in this circuit, the traveling motor 1 is driven by the external force. There is no drain pressure.

【0013】 又オペレ−タに異常を伝える手段として、ランプ16の代りに図3に示す様に ホ−ン17を用いることも可能である。It is also possible to use a horn 17 as shown in FIG. 3 in place of the lamp 16 as means for transmitting an abnormality to the operator.

【0014】 尚、図1には右走行の回路図を示したが、左走行部にも同様の機能が設けてあ る。つまり図2,図3に示す電気回路で明らかな様にドレン圧検出用の圧力スイ ッチ2はそれぞれ(右走行,左走行)のドレンラインに各1個取付いており、い ずれかの圧力スイッチ2で異常圧を検出した時には、右走行・左走行の走行モ− タ1が同時に停止する様になっている。Although FIG. 1 shows a circuit diagram for right traveling, the left traveling portion is also provided with the same function. That is, as is apparent from the electric circuits shown in Figs. 2 and 3, one pressure switch 2 for detecting the drain pressure is attached to each drain line (right running, left running), and either pressure is detected. When the abnormal pressure is detected by the switch 2, the traveling motors 1 for right traveling and left traveling are stopped at the same time.

【提出日】平成4年3月25日[Submission date] March 25, 1992

【手続補正1】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】0004[Correction target item name] 0004

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【0004】[0004]

【課題を解決するための手段】 走行モータ1のドレンライン11に圧 力検出用圧力スイッチ2を設け、又方向切換弁5のパイロットラインに電磁切換 弁6a,6bを設けて、前記圧力スイッチ2の「入」・「切」によりパイロット ラインを切換えるようにし、さらに前記方向切換弁5と電磁切換弁6a,6bと の間のパイロットラインにそれぞれスローリターン弁7a,7bを設けて方向切 換弁切換時のパイロット圧を緩やかに逃がすようにした。 又運転室内に異常を知らせるランプ16を取付け、圧力スイッチ2の作動でリ レー15bを閉じてランプ16を点させて確認できるようにした。Means for Solving the Problem A pressure detecting pressure switch 2 is provided in a drain line 11 of a traveling motor 1, and electromagnetic switching valves 6a and 6b are provided in a pilot line of a directional switching valve 5, and the pressure switch 2 is provided. The pilot line is switched by "ON" and "OFF", and slow return valves 7a and 7b are provided in the pilot line between the directional switching valve 5 and the electromagnetic switching valves 6a and 6b, respectively, to switch the directional switching valve. I tried to let the pilot pressure of the time loosely escape. The mounting lamp 16 to inform the abnormality to the operation room, and be able to see by lit lamps 16 to close the relay 15b by operation of the pressure switch 2.

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

【図1】本考案に係る安全装置の回路図。FIG. 1 is a circuit diagram of a safety device according to the present invention.

【図2】リレ−15とこれにより開閉する接点の関連回
路図。
FIG. 2 is a related circuit diagram of a relay 15 and a contact opened / closed by the relay 15;

【図3】他の実施例回路図。FIG. 3 is a circuit diagram of another embodiment.

【符号の説明】[Explanation of symbols]

1 走行モ−タ 2 圧力スイッチ 3 センタ−ジョイント 4,4a,4b,4c セルフシ−ルカップリング 5 方向切換弁 6a,6b 電磁切換弁 7a,7b スロ−リタ−ン弁 8 ポンプ 9 リモコン弁 9a レバ− 10 タンク 11 ドレンライン 12 カウンタ−バランス弁 13 電源 14 スリップリング 15 リレ− 15a,15b 接点 16 ランプ 17 ホ−ン 1 Traveling motor 2 Pressure switch 3 Center joint 4, 4a, 4b, 4c Self-sealing coupling 5 Directional switching valve 6a, 6b Solenoid switching valve 7a, 7b Slow return valve 8 Pump 9 Remote control valve 9a lever − 10 Tank 11 Drain line 12 Counter − Balance valve 13 Power supply 14 Slip ring 15 Relays 15a, 15b contact 16 Lamp 17 Horn

【手続補正書】[Procedure amendment]

【提出日】平成4年3月25日[Submission date] March 25, 1992

【手続補正2】[Procedure Amendment 2]

【補正対象書類名】図面[Document name to be corrected] Drawing

【補正対象項目名】図1[Name of item to be corrected] Figure 1

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【図1】 [Figure 1]

【手続補正3】[Procedure 3]

【補正対象書類名】図面[Document name to be corrected] Drawing

【補正対象項目名】図2[Name of item to be corrected] Figure 2

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【図2】 [Fig. 2]

Claims (2)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】 走行モ−タ(1)のドレンライン(11)に圧
力検出用圧力スイッチ(2)を設け、又方向切換弁(5)の
パイロットラインに電磁切換弁(6a,6b)を設けて前記圧
力スイッチ(2)の「入」・「切」によりパイロットライ
ンを切換えるようにし、さらに前記方向切換弁(5)と電
磁切換弁(6a,6b)との間のパイロットラインにそれぞれ
スロ−リタ−ン弁(7a,7b)を設けて方向切換弁切換時の
パイロット圧を緩やかに逃がすようにしたことを特徴と
する走行モ−タのドレン圧力上昇に対する安全装置。
1. A pressure switch (2) for detecting pressure is provided in the drain line (11) of the traveling motor (1), and an electromagnetic switching valve (6a, 6b) is provided in the pilot line of the directional switching valve (5). A pilot line is provided by switching on / off of the pressure switch (2), and the pilot line between the directional switching valve (5) and the electromagnetic switching valve (6a, 6b) is slid respectively. -A safety device against a rise in the drain pressure of the traveling motor, which is provided with a return valve (7a, 7b) so that the pilot pressure at the time of switching the direction switching valve is gradually released.
【請求項2】 運転室内に異常を知らせるランプ(16)を
取付け、圧力スイッチ(2)の作動でリレ−(15b)を閉じ
てランプ(16)が点灯するようにした請求項1の走行モ−
タのドレン圧力上昇に対する安全装置。
2. The traveling mode according to claim 1, wherein a lamp (16) for notifying an abnormality is installed in the cab, and the relay (15b) is closed by the operation of the pressure switch (2) so that the lamp (16) is turned on. −
A safety device against rising drain pressure.
JP781692U 1992-01-28 1992-01-28 Safety device against rising drain pressure of running motor Pending JPH0561505U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP781692U JPH0561505U (en) 1992-01-28 1992-01-28 Safety device against rising drain pressure of running motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP781692U JPH0561505U (en) 1992-01-28 1992-01-28 Safety device against rising drain pressure of running motor

Publications (1)

Publication Number Publication Date
JPH0561505U true JPH0561505U (en) 1993-08-13

Family

ID=11676124

Family Applications (1)

Application Number Title Priority Date Filing Date
JP781692U Pending JPH0561505U (en) 1992-01-28 1992-01-28 Safety device against rising drain pressure of running motor

Country Status (1)

Country Link
JP (1) JPH0561505U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011179603A (en) * 2010-03-02 2011-09-15 Nippon Sharyo Seizo Kaisha Ltd Hydraulic motor driving device
JP2014163464A (en) * 2013-02-26 2014-09-08 Kobelco Cranes Co Ltd Hydraulic circuit and construction machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011179603A (en) * 2010-03-02 2011-09-15 Nippon Sharyo Seizo Kaisha Ltd Hydraulic motor driving device
JP2014163464A (en) * 2013-02-26 2014-09-08 Kobelco Cranes Co Ltd Hydraulic circuit and construction machine

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