JPS59185234A - Controller for front loader - Google Patents

Controller for front loader

Info

Publication number
JPS59185234A
JPS59185234A JP6060883A JP6060883A JPS59185234A JP S59185234 A JPS59185234 A JP S59185234A JP 6060883 A JP6060883 A JP 6060883A JP 6060883 A JP6060883 A JP 6060883A JP S59185234 A JPS59185234 A JP S59185234A
Authority
JP
Japan
Prior art keywords
pressure
boom
circuit
solenoid valve
packet
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
JP6060883A
Other languages
Japanese (ja)
Other versions
JPH0322485B2 (en
Inventor
Akio Hamada
浜田 昭夫
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.)
Kubota Corp
Original Assignee
Kubota Corp
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 Kubota Corp filed Critical Kubota Corp
Priority to JP6060883A priority Critical patent/JPS59185234A/en
Publication of JPS59185234A publication Critical patent/JPS59185234A/en
Publication of JPH0322485B2 publication Critical patent/JPH0322485B2/ja
Granted legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/226Safety arrangements, e.g. hydraulic driven fans, preventing cavitation, leakage, overheating

Abstract

PURPOSE:To prevent maloperation in composite operations of a front loader by a method in which an electromagnetic control valve for boom and an electromagnetic control valve for bucket are set in series to an oil-pressure pump, and when an oil-pressure circuit reaches a given pressure or more, only one of both the control valves is allowed to operate. CONSTITUTION:An electromagnetic control valve 12 to control a bucket pivotally supported on the tip of a boom is set in series with an oil-pressure pump 9 in the downstream of an electromagnetic control valve 13 to control the boom cylinder 4 of a front loader. A pressure sensor 18 is provided to the oil-pressure circuit between the control valve 13 and the pump 9. The pressure of the oil- pressure circuit is detected by the pressure sensor 18, and when the pressure rises to a given one, only one of both the control valves 13 and 15 is allowed to operate. Maloperation in the composite operations of the front loader can thus be avoided.

Description

【発明の詳細な説明】 本発明は、フロントローダの制御装置に関し、電磁弁を
直列に組合せた単純な構成でも、複合作業時に誤動作す
ることなく確実に制御できるようにすることを目的とす
る。
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a front loader, and an object of the present invention is to enable reliable control without malfunction during complex operations even with a simple configuration in which solenoid valves are combined in series.

フロントローダの制御装置において、ブーム制御用の電
磁弁と、ブーム先端の作業具(例えばパケット)制御用
の電磁弁とを直列に接続した簡単な構成のものがある。
Some control devices for front loaders have a simple configuration in which a solenoid valve for boom control and a solenoid valve for controlling a working tool (for example, a packet) at the tip of the boom are connected in series.

この種の制御装置では、両者電磁弁を作動させた場合、
何等かの原因で回路圧が上昇すれば、前段の電磁弁に背
圧が作用して誤動作による逆流が発生し、制御不能にな
ることがある。例えば、前段側をブーム制御用、後段を
パケット制御用とした場合、パケットヲ土砂に突込み、
パケット制御用電磁弁を作動させながらブームを弁昇さ
せようとすると、背圧の作用でブー  。
In this type of control device, when both solenoid valves are operated,
If the circuit pressure increases for some reason, back pressure will act on the solenoid valve in the previous stage, causing backflow due to malfunction, which may result in loss of control. For example, if the front stage is used for boom control and the rear stage is used for packet control, the packet will plunge into the earth and sand,
If you try to raise the boom while operating the packet control solenoid valve, it will boom due to back pressure.

ム制御用電磁弁が誤動作し、ブームが下降してしまうこ
とがある。
The boom control solenoid valve may malfunction, causing the boom to descend.

本発明は、このような従来の問題点を解消するものであ
って、その特徴とする処は、ブーム制御用の電磁弁と、
ブーム先端部の作業具制御用の電磁弁とを直列に接続し
たフロントローダの制御装、置において、前段側電磁弁
と油圧ポンプとを結ぶ油圧回路に圧力センサを設け、こ
の圧力センサが所定圧力までの圧力上昇を検出した時に
、前記両電磁弁の内、何れか一方のみを動作可能にする
制御回路を設は九点にある。
The present invention solves these conventional problems, and its features include a solenoid valve for boom control,
In a front loader control system, in which a solenoid valve for controlling the work implement at the tip of the boom is connected in series, a pressure sensor is installed in the hydraulic circuit connecting the front solenoid valve and the hydraulic pump, and this pressure sensor detects a predetermined pressure. Control circuits are installed at nine points to enable operation of only one of the two electromagnetic valves when a pressure rise of up to 100 is detected.

以下、図示の実施例について本発明を詳述すると、第1
図はトラクタ装置用のパケット型フロントローダを示し
、(1)はトラクタ、(2)は取付フレーム、(3)U
左右一対のブームで、取付フレーム(2)に昇降自在に
枢着され、かつ左右一対のブームシリンダ(4)により
昇降自在である。(5)はパケットで、ブーム(3)の
先端部に枢支され、左右一対のパケットシリンダ(6)
によシ回動操作可能である。(7)は三点リンク機構、
(8)は三点リンク機構(7)を介して装着された作業
機を昇降させるための油圧装置である。
Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.
The figure shows a packet type front loader for tractor equipment, where (1) is the tractor, (2) is the mounting frame, and (3) is the U.
A pair of left and right booms are pivoted to the mounting frame (2) so that they can be raised and lowered, and can be raised and lowered by a pair of left and right boom cylinders (4). (5) is a packet, which is pivoted at the tip of the boom (3) and has a pair of left and right packet cylinders (6).
It can be rotated freely. (7) is a three-point linkage mechanism,
(8) is a hydraulic device for raising and lowering the working machine attached via the three-point linkage mechanism (7).

第2図は油圧回路を示し、(9)は油圧ポンプで、エン
ジンα0により駆動される。0Dはブームシリンダ(4
)の制御用の電磁弁、aっはパケットシリンダ(6)の
制御用の電磁弁で、これらは電磁弁αυを前段、電磁弁
a2t−後段として直列に接続されている。電磁弁α刀
は上昇用ソレノイド口と下降用ソレノイドσ4とを有し
、電磁弁a2ハダンプ用ソレノイドσ9とロールバック
用ソレノイドαGとを有する。07)はリリーフ弁、(
181は圧力センサで、これらは電磁弁0と油田ポンプ
(9)との間の油田回路に接続されている。圧力センサ
(至)は回路圧がリリーフ弁αηのリリーフ圧よりも若
干低いタップキング圧(所定圧力)まで上昇した時に出
力(EE圧力センサ号)を発生する。
FIG. 2 shows a hydraulic circuit, where (9) is a hydraulic pump, which is driven by engine α0. 0D is the boom cylinder (4
), a is a solenoid valve for controlling the packet cylinder (6), and these are connected in series with the solenoid valve αυ as the first stage and the solenoid valve a2t as the second stage. The solenoid valve α has a rising solenoid port and a lowering solenoid σ4, and the solenoid valve a2 has a dumping solenoid σ9 and a rollback solenoid αG. 07) is a relief valve, (
181 is a pressure sensor, and these are connected to the oil field circuit between the electromagnetic valve 0 and the oil field pump (9). The pressure sensor (to) generates an output (EE pressure sensor number) when the circuit pressure rises to a tapping pressure (predetermined pressure) that is slightly lower than the relief pressure of the relief valve αη.

第3図は制御回路を示し、0gはブーム上昇用の操作ス
イッチ、(イ)はブーム下降用の操作スイッチ、QBは
パケットダンプ用の操作スイッチ、■はパケットロール
バック用の操作スイッチで、これらは例tば1本の操作
レバーのに連動してブーム用、パケット用の夫々毎に選
択操作可能である。(至)−はOR回路、(イ)〜困は
NAND回路、囚はNAND回路から成るRSSフリッ
プフロラ回路、(至)はNOT回路、G刀〜(至)はA
ND回路である。翰〜け2は各ソレノイド03〜σGの
駆動用のトランジスタである。
Figure 3 shows the control circuit, 0g is the operation switch for raising the boom, (A) is the operation switch for lowering the boom, QB is the operation switch for packet dumping, and ■ is the operation switch for packet rollback. For example, in conjunction with one operation lever, the boom and packet can be selectively operated. (to) - is an OR circuit, (a) to trouble is a NAND circuit, (to) is an RSS flip-flop circuit consisting of a NAND circuit, (to) is a NOT circuit, G sword to (to) is A
It is an ND circuit. Reference characters 2 to 2 are transistors for driving the solenoids 03 to σG.

次に作用を説明する。土砂の掘削積込み作業に際しては
、操作レバーノヲ操作し、ブームシリンダ(4)及びパ
ケットシリンダ(6)の伸縮動作によってブーム(3)
及びパケット(5)を第1図実線の如く位置させながら
トラクタ(1)全前進走行させる。そして、パケット(
5)内に土砂が入れば、パケット(5)をロールバック
すると共に、ブーム(3)を上昇させて運搬し、次にパ
ケット(5)をダンプさせて土砂を排出するのである。
Next, the effect will be explained. When excavating and loading earth and sand, operate the control lever and move the boom (3) by expanding and contracting the boom cylinder (4) and packet cylinder (6).
Then, while the packet (5) is positioned as shown by the solid line in FIG. 1, the tractor (1) is made to travel fully forward. And the packet (
5) If dirt gets inside, the packet (5) is rolled back, the boom (3) is raised to transport it, and then the packet (5) is dumped to discharge the dirt.

このような作業時において、制御回路は次のように動作
し、各電磁弁an Q3を信号に応じて駆動する。例え
ばパケット(5)ヲローμパックさせる際には、操作レ
バー□□□により操作スイッチ■を操作すると、パケッ
トロールバック信号が発生し、aND回路回路弁してト
ランジスタ旧が動作して電磁弁■のソレノイドσGが励
磁し、電磁弁a3がロールバック方向に作動する。従っ
てパケットシリンダ(6)が収縮し、パケット(5)が
ロールパックする。
During such work, the control circuit operates as follows and drives each electromagnetic valve anQ3 according to a signal. For example, when packing packet (5), operate the operation switch ■ with the operation lever □□□, a packet rollback signal will be generated, the aAND circuit circuit valve will operate the transistor old, and the solenoid valve ■ will be activated. Solenoid σG is excited, and solenoid valve a3 operates in the rollback direction. The packet cylinder (6) therefore contracts and the packet (5) roll packs.

パケット(5)のダンプ時には、操作スイッチc2Dが
パケットダンプ信号を発生し、m1回路(ロ)、トラン
ジスタ圓を介して電磁弁0のソレノイド口が励磁し、電
磁弁凹がダンプ方向に作動し、パケットシリンダ(6)
が伸長してパケット(5)がダンプする。
When dumping the packet (5), the operation switch c2D generates a packet dump signal, the solenoid port of the solenoid valve 0 is energized via the m1 circuit (b) and the transistor circle, and the solenoid valve concave operates in the dumping direction. Packet cylinder (6)
is expanded and packet (5) is dumped.

ブーム(3)の上昇又は下降時には、操作スイッチα9
又は■がブーム上昇信号又はブーム下降信号を発生し、
鼾回路(至)又は(至)、トランジスタ(至)又は(ト
)を介して電磁弁0のソレノイド口又は(141が励磁
し、電磁弁α3が上昇又は下降方向に動作してブームシ
リンダ(4)が伸長又は収縮し、ズーム(3)が上昇又
は下降する。
When raising or lowering the boom (3), press the operation switch α9.
or ■ generates a boom up signal or a boom down signal,
The solenoid port or (141) of the solenoid valve 0 is energized through the snoring circuit (to) or (to) and the transistor (to) or (g), and the solenoid valve α3 operates in the upward or downward direction to activate the boom cylinder (4). ) expands or contracts, and zoom (3) rises or falls.

操作スイッチa9及び■を同時に操作し、パケット(5
)をロールパックさせながらブーム(3)を上昇させる
場合には、各電磁弁αnazが前述の如く動作し、ブー
ムシリンダ(4)には油圧ポンプ(9)からの圧力油が
、またパケットシリンダ(6)にはブームシリンダ(4
)からの圧力油が夫々供給され、各シリンダ(43(6
)が作動する。なお各シリンダ(4) (6)には同径
で同容積のものが使用されている。この時、圧力センサ
@の検出する回路圧がクラッキング庄原下であれば、圧
力センサ信号を発生しないので、N AND回路(ハ)
の出力は■レベルであるため、フリップフロップ回路臼
の出力は前の状態、即ちLレベ/I/を保ち、NOT回
路(7)、v山口路(至)C(3を介してAND回路(
至)(至)カ動作する。勿論、AND回路0刀の出力も
■レベルである。そこで何等かの原因によシ過大負荷が
作用して回路圧がクラッキング圧まで達すると、圧力セ
ンサ(至)が働いて圧力センサ信号を発生するので、N
AND回路(ロ)の入力が全てHレベμと7ZLその出
力がLレベルに変わる。従って、フリップフロップ回路
■の出力がHレベμとなり、 N(II’回路(7)を
介してAND回路□□□(ト)が閉じるので、各電磁弁
aD口が中立に復帰し、シリンダ(4] (6)は共に
伸縮動作を中断する。つまカ、作業は中断状態となシ、
回路圧がクラッキング圧板下となってもその状態を維持
する。そこで、操作スイッチag囚の何れか一方を戻し
てやると、AND回路O刀の出力がLレベルに変わるの
で、フリツプフロツプ回路囚の出力がLレベルとなシ、
NOT回路(至)、AND回路回路へ)、AND回路(
至)(ハ)を介して電磁弁u鰺の何れか一方のみが動作
し、他方は動作不能である。即ち、一旦、回路圧がクラ
ッキング圧まで上昇すると、その後、−万の信号を断た
ない限シ、電磁弁u饅は中立状態を維持し、何れかを選
択した詩に始めて中断が解除され、欠の動作に移行でき
るのである。従って、電磁弁0Dが直列接続であるにも
拘らず、前段の電磁弁■にクラッキング圧のような大き
な背圧が作用することはなく、作業途中でのブーム(3
)の下降を防止でき、また安全性、耐久性も向上する。
Simultaneously operate operation switches a9 and
) to raise the boom (3) while roll-packing the packet cylinder ( 6) has a boom cylinder (4
) is supplied with pressure oil from each cylinder (43 (6
) is activated. The cylinders (4) and (6) have the same diameter and the same volume. At this time, if the circuit pressure detected by the pressure sensor @ is below cracking Shobara, the pressure sensor signal will not be generated, so the NAND circuit (c)
Since the output of is at ■ level, the output of the flip-flop circuit maintains the previous state, that is, L level /I/, and is connected to the AND circuit (
(To) (To) It works. Of course, the output of the AND circuit 0 sword is also at ■ level. When the circuit pressure reaches the cracking pressure due to an overload caused by some reason, the pressure sensor (to) is activated and generates a pressure sensor signal.
The inputs of the AND circuit (b) are all H level μ and 7ZL, and its output changes to L level. Therefore, the output of the flip-flop circuit ■ becomes H level μ, and the AND circuit □□□ (G) is closed via the N(II' circuit (7)), so each solenoid valve aD port returns to neutral, and the cylinder ( 4] (6) both interrupt the expansion and contraction operation.
This state is maintained even if the circuit pressure falls below the cracking pressure plate. Therefore, when either one of the operation switches ag is returned, the output of the AND circuit changes to L level, so the output of the flip-flop circuit changes to L level.
NOT circuit (to), AND circuit (to circuit), AND circuit (to
To) Only one of the solenoid valves u is operated via (c), and the other is inoperable. That is, once the circuit pressure rises to the cracking pressure, the solenoid valve U will maintain a neutral state unless the -10 signal is cut off, and the interruption will be released only when one of the poems is selected. It is possible to shift to the absent movement. Therefore, even though the solenoid valves 0D are connected in series, a large back pressure such as cracking pressure does not act on the preceding solenoid valve ■, and the boom (3
) can be prevented from falling, and safety and durability are also improved.

以上の動作を第4図の流れ図に示す。The above operation is shown in the flowchart of FIG.

なお、これは、他の組合せ動作中においても同様である
Note that this also applies during other combination operations.

電磁弁α11a2は前後逆に設けても良い。圧力センサ
(至)が検出する所定圧力はリリーフ弁面のリリーフ圧
に設定することも可能であシ、またパケット(5)に代
えて他のフォーク等の作業具を使用した場合にも同効で
ある。
The solenoid valve α11a2 may be provided with the front and back reversed. The predetermined pressure detected by the pressure sensor (to) can be set to the relief pressure on the relief valve surface, and the same effect can be obtained when using another work tool such as a fork instead of the packet (5). It is.

本発明では、前段側の電磁弁と油圧ポンプとを結ぶ油圧
回路の回路圧が所定圧力までに上昇した時に圧力センサ
で検出し、直列接続されたブーム制御用と作業具制御用
の電磁弁の内、何れか一方を動作可能にするようにして
いるので、前段の電磁弁に所定圧力以上の背圧が作用す
ることはなく、誤動作を防止できる。従って、単に電磁
弁を直列に接続した程度の極く簡単な組合せのものでも
十分使用可能であ夛、安価に製作できる。また安全性、
耐久性も向上する。更に余分な油圧部品を必要としない
ので、ゴミの詰シ等による不良の発生を防止できる。
In the present invention, a pressure sensor detects when the circuit pressure of the hydraulic circuit connecting the front side solenoid valve and the hydraulic pump rises to a predetermined pressure, and the solenoid valves for boom control and work implement control connected in series are detected. Since either one of them is made operable, back pressure exceeding a predetermined pressure will not act on the preceding solenoid valve, and malfunction can be prevented. Therefore, even a very simple combination of solenoid valves connected in series can be sufficiently used and can be manufactured at low cost. Also safety,
Durability is also improved. Furthermore, since no extra hydraulic parts are required, defects caused by clogging with dirt, etc. can be prevented.

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

\ 図面は本発明の一実施例を示し、第1図は全体の側面図
、第2図は油圧回路図、第6図は電気回路図、第4図は
動作の流れ図である。 (1)・・・トラクタ、(3)・・・ブーム、(4)・
・・ブームシリンダ、(5)・・・パケット、(6ン・
・・パケットシリンダ、(9ン・・・油圧ポンプ、(1
1)Q2・・・電磁弁、囮・・・圧力センサ、ag〜に
・・・操作スイッチ。 特許出願人  久保田鉄工株式会社
\ The drawings show one embodiment of the present invention, and FIG. 1 is an overall side view, FIG. 2 is a hydraulic circuit diagram, FIG. 6 is an electric circuit diagram, and FIG. 4 is an operation flowchart. (1)...Tractor, (3)...Boom, (4)...
...Boom cylinder, (5) ...Packet, (6n.
... Packet cylinder, (9... Hydraulic pump, (1
1) Q2...Solenoid valve, decoy...pressure sensor, ag~...operation switch. Patent applicant Kubota Iron Works Co., Ltd.

Claims (1)

【特許請求の範囲】[Claims] 1、 ブーム制御用の電磁弁と、ブーム先端部の作業具
制御用の電磁弁とを直列に接続したフロントローダの制
御装置において、前段側電磁弁と油圧ポンプとを結ぶ油
圧回路に圧力センサを設け、この圧力センサが所定圧力
までの圧力上昇を検出した時に、前記両電磁弁の内、何
れか一方のみを動作可能にする制御回路を設けたことを
特徴とするフロントローダの制御装置。
1. In a front loader control system that connects a solenoid valve for boom control and a solenoid valve for controlling work tools at the tip of the boom in series, a pressure sensor is installed in the hydraulic circuit connecting the front solenoid valve and the hydraulic pump. A control device for a front loader, comprising: a control circuit that enables only one of the electromagnetic valves to operate when the pressure sensor detects a pressure increase to a predetermined pressure.
JP6060883A 1983-04-05 1983-04-05 Controller for front loader Granted JPS59185234A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6060883A JPS59185234A (en) 1983-04-05 1983-04-05 Controller for front loader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6060883A JPS59185234A (en) 1983-04-05 1983-04-05 Controller for front loader

Publications (2)

Publication Number Publication Date
JPS59185234A true JPS59185234A (en) 1984-10-20
JPH0322485B2 JPH0322485B2 (en) 1991-03-27

Family

ID=13147134

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6060883A Granted JPS59185234A (en) 1983-04-05 1983-04-05 Controller for front loader

Country Status (1)

Country Link
JP (1) JPS59185234A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62244930A (en) * 1986-04-15 1987-10-26 Kubota Ltd Controller for front loader
EP0934804A2 (en) * 1998-01-30 1999-08-11 Krupp Berco Bautechnik GmbH Fluid driven percussion device
EP1304487A3 (en) * 2001-10-19 2006-04-19 Deere & Company Series hydraulic circuit for controlling operation of multiple cutting decks of a tractor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62244930A (en) * 1986-04-15 1987-10-26 Kubota Ltd Controller for front loader
EP0934804A2 (en) * 1998-01-30 1999-08-11 Krupp Berco Bautechnik GmbH Fluid driven percussion device
EP0934804A3 (en) * 1998-01-30 2003-03-05 Atlas Copco Construction Tools GmbH Fluid driven percussion device
EP1304487A3 (en) * 2001-10-19 2006-04-19 Deere & Company Series hydraulic circuit for controlling operation of multiple cutting decks of a tractor
US7415919B2 (en) 2001-10-19 2008-08-26 Deere & Company Series hydraulic circuit for controlling operation of multiple cutting decks of a tractor

Also Published As

Publication number Publication date
JPH0322485B2 (en) 1991-03-27

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