JPH0781552B2 - Control circuit for hydraulically driven single cylinder pump - Google Patents
Control circuit for hydraulically driven single cylinder pumpInfo
- Publication number
- JPH0781552B2 JPH0781552B2 JP62172606A JP17260687A JPH0781552B2 JP H0781552 B2 JPH0781552 B2 JP H0781552B2 JP 62172606 A JP62172606 A JP 62172606A JP 17260687 A JP17260687 A JP 17260687A JP H0781552 B2 JPH0781552 B2 JP H0781552B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- hydraulic cylinder
- cylinder
- solenoid valve
- pressure
- 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.)
- Expired - Fee Related
Links
Description
【発明の詳細な説明】 「産業上の利用分野」 本発明は、例えば掘削土や生コンクリート等の流動体を
圧送する油圧駆動単筒式ポンプの制御回路に係り、油圧
駆動単筒式ポンプとこれを駆動する油圧ポンプとが離れ
た場所で使用される場合の油圧駆動単筒式ポンプの制御
回路に関するものである。TECHNICAL FIELD The present invention relates to a control circuit for a hydraulically driven single-tube pump that pumps fluid such as excavated soil or ready-mixed concrete. The present invention relates to a control circuit for a hydraulically driven single-cylinder pump when the hydraulic pump for driving the same is used at a remote place.
「従来の技術」 最近、都市部の土木工事において、例えば、シールド工
事による掘削土の地上への圧送、コンクリートの巻きた
て等を行う際に、油圧駆動単筒式ポンプが使用されてい
るが、単筒式ポンプとその動力源である油圧ポンプとを
分離しかつ小型化するとともに、これらを遠隔操作によ
って容易に制御することのできる油圧駆動単筒式ポンプ
の制御回路が要求されている。“Prior Art” Recently, in civil engineering works in urban areas, for example, when hydraulically driven single-cylinder pumps are used when pumping excavated soil to the ground by shield work or rolling concrete. There is a demand for a control circuit for a hydraulically driven single-cylinder pump that can separate and downsize the single-cylinder pump and the hydraulic pump that is the power source thereof, and can easily control these by remote operation.
従来、この種の油圧駆動単筒式ポンプの制御回路として
は、例えば第７図に示すように、圧送シリンダａの端部
に油圧シリンダｂを固定し、該圧送シリンダａと油圧シ
リンダｂとの内部を往復移動するピストンc1,c2を相互
にピストンロッドｄで連結して設け、これにより圧送シ
リンダ内に供給される流動体を圧送するようにした単筒
式ポンプＡと、この単筒式ポンプＡの圧送シリンダａ内
へ吸入口を介して被輸送流動体を供給するホッパー（図
示せず）と、このホッパーから圧送シリンダ内へ流動体
を供給する際に、圧送シリンダの吐出口を閉塞するとと
もに、圧送シリンダ内へ供給された被輸送流動体を前記
ピストンc1で押し出して圧送する際に、ホッパーからの
吸入口を閉塞するようにした回転弁ｅと、この回転弁ｅ
をアームｆを介して回動作動させる弁駆動用油圧シリン
ダｇと、この弁駆動用油圧シリンダｇと前記単筒式ポン
プＡの油圧シリンダｂとを離れた場所から駆動するため
の動力源である油圧ポンプｈと、前記油圧ポンプｈと油
圧シリンダｂ及び弁駆動用油圧シリンダｇとの間を接続
して油の供給、回収を行うようにした一系統の配管Ｂ
と、油圧ポンプｈと油圧シリンダｂとの間の配管ｉに介
挿される第１の電磁弁ｊと、この第１の電磁弁ｊを介し
て油圧シリンダｂと弁駆動用シリンダｇとの間に設けら
れる配管ｋに介挿される第２の電磁弁１とを備えたもの
であり、前記油圧ポンプｈから圧送される油を前記第１
及び第２の電磁弁j,lによって切換えることにより油圧
シリンダｂと駆動用油圧シリンダｇとを連動させて駆動
することにより圧送シリンダａ内の流動体を圧送するよ
うにしたものが知られている。Conventionally, as a control circuit of a hydraulically driven single-cylinder pump of this type, as shown in FIG. 7, for example, a hydraulic cylinder b is fixed to an end of a pressure feeding cylinder a, and the pressure feeding cylinder a and the hydraulic cylinder b are connected to each other. A single-cylinder pump A in which pistons c 1 and c 2 that reciprocate inside are connected to each other by a piston rod d, and by which the fluid supplied to the pressure-feed cylinder is pressure-fed, and this single-cylinder pump A A hopper (not shown) for supplying a fluid to be transported into the pressure-feeding cylinder a of the automatic pump A through an inlet, and a discharge port of the pressure-feeding cylinder when supplying the fluid from the hopper into the pressure-feeding cylinder. A rotary valve e that closes and closes the suction port from the hopper when the fluid to be transported supplied into the pressure-feed cylinder is pushed out by the piston c 1 and pressure-fed.
Is a power source for driving the valve-driving hydraulic cylinder g for rotatably operating the arm via the arm f, and the valve-driving hydraulic cylinder g and the hydraulic cylinder b of the single-cylinder type pump A from remote locations. A hydraulic pump h and a system B for connecting and connecting the hydraulic pump h to the hydraulic cylinder b and the valve driving hydraulic cylinder g to supply and recover oil.
And a first electromagnetic valve j inserted in a pipe i between the hydraulic pump h and the hydraulic cylinder b, and between the hydraulic cylinder b and the valve driving cylinder g via the first electromagnetic valve j. A second electromagnetic valve 1 inserted in a pipe k provided is provided, and the oil pressure-fed from the hydraulic pump h is transferred to the first electromagnetic valve 1.
It is known that the fluid in the pressure-feeding cylinder a is pressure-fed by driving the hydraulic cylinder b and the driving hydraulic cylinder g in conjunction with each other by switching with the second solenoid valves j, l. .
「発明が解決しようとする問題点」 ところが、前記従来の油圧駆動単筒式ポンプＡの制御回
路においては、単筒式ポンプＡで流動体を継続的に効率
良く圧送するために、特に高揚程圧送においては、流動
体の逆流抑制の目的から回転弁ｅを可能な限り短時間の
内に切換える必要があるが、油圧シリンダｂと弁駆動油
圧シリンダｇとが、第1,第２の電磁弁j,lを介在させた
シーケンス駆動させるようになっていること、駆動源で
ある油圧ポンプｈと流動体を圧送する単筒式ポンプＡと
が離れた場所にあって、一系統の配管系が長くなってい
ること、油圧ポンプｈの吐出量を少なくして圧送シリン
ダｂの吐出量すなわち流動体の輸送量を少なくする場合
には、弁駆動用油圧シリンダｇへの流量も少なくなるこ
と等の理由から、回転弁ｅの切換時間を短くすることに
限界があり、特に、生コンクリート等流動性の乏しい流
動体の圧送量を向上させることが困難であるという問題
点があった。[Problems to be Solved by the Invention] However, in the control circuit of the conventional hydraulically driven single cylinder type pump A, in order to continuously and efficiently pump the fluid by the single cylinder type pump A, a particularly high head In the pressure feeding, it is necessary to switch the rotary valve e within the shortest possible time for the purpose of suppressing the backflow of the fluid, but the hydraulic cylinder b and the valve driving hydraulic cylinder g are the first and second solenoid valves. It is designed to be driven in sequence with j and l interposed, and the hydraulic pump h, which is the drive source, and the single-cylinder pump A that pumps the fluid are separated from each other. If the discharge amount of the hydraulic pump h is reduced to reduce the discharge amount of the pressure feeding cylinder b, that is, the transport amount of the fluid, the flow rate to the valve driving hydraulic cylinder g also decreases. For the reason, change the switching time of rotary valve e. There is a limit in Kusuru, in particular, there is a problem that it is difficult to improve the pumping quantity of the fresh concrete, etc. fluidity of poor fluid.
本発明は、前記問題点に鑑みてなされたものであり、一
系統の高揚程圧送の配管系のままで弁駆動用シリンダー
を短時間のうちに作動させて回転弁を早急に切り換える
ことにより、効率良く流動体を圧送することができ、コ
ンクリートポンプとして使用した場合でも、その圧送量
を大幅に増大させることのできる油圧駆動単筒式ポンプ
の制御回路を提供することを目的としている。The present invention has been made in view of the above problems, by operating the valve driving cylinder in a short time while the piping system for high-lift pumping of one system is operated in a short period of time, thereby rapidly switching the rotary valve, It is an object of the present invention to provide a control circuit for a hydraulically driven single-cylinder pump that can efficiently pump a fluid and can significantly increase the pumping amount even when used as a concrete pump.
「問題点を解決するための手段」 上記の目的を達成するために、本発明は、ホッパの流動
体を吸引して圧送する圧送シリンダを動かす圧送用油圧
シリンダと、上記ホッパの吸入口の部分に設けられた切
換弁を作動させる弁駆動用油圧シリンダと、油圧ポンプ
と、Ａポートを上記圧送用油圧シリンダの一端側に、Ｂ
ポートを圧送用油圧シリンダの他端側に、またＰポート
を上記油圧ポンプに、更にＴポートを中間配管の一端に
それぞれ接続して設けられ、第１位置において上記油圧
ポンプを圧送用油圧シリンダの一端側にまた圧送用油圧
シリンダの他端側を上記中間配管にそれぞれ連絡し、第
２位置において油圧ポンプを圧送用油圧シリンダの他端
側にまた圧送用油圧シリンダの一端側を中間配管にそれ
ぞれ連絡し、中立位置において圧送用油圧シリンダの一
端側と他端側とを遮断するとともに油圧ポンプを中間配
管に連絡する第１電磁弁と、Ａポートを上記弁駆動用油
圧シリンダの一端側に、Ｂポートを弁駆動用油圧シリン
ダの他端側に、またＰポートを上記中間配管の他端に、
更にＴポートを油槽にそれぞれ接続して設けられ、第１
位置において上記中間配管を弁駆動用油圧シリンダの一
端側にまた弁駆動用油圧シリンダの他端側を上記油槽に
それぞれ連絡し、第２位置において中間配管を弁駆動用
油圧シリンダの他端側にまた弁駆動用油圧シリンダの一
端側を油槽にそれぞれ連絡し、中立位置において弁駆動
用油圧シリンダの一端側と他端側とを遮断するとともに
中間配管を油槽に連絡する第２電磁弁と、上記中間配管
に設けられ該中間配管を遮断する第３電磁弁と、上記第
１電磁弁と上記第３電磁弁の間において中間配管に設け
られ第１電磁弁から第２電磁弁に向う作動油の流れを許
してその逆の流れを止める逆止弁と、上記第３電磁弁と
上記逆止弁との間において中間配管から個々に分岐して
設けられた蓄圧器及び逃がし弁と、上記中間配管と上記
蓄圧器との間に設けられ蓄圧器を遮断する第４電磁弁と
を具備した構成とした。[Means for Solving the Problems] In order to achieve the above object, the present invention relates to a hydraulic cylinder for pumping that moves a pumping cylinder that sucks and pumps a fluid of a hopper, and a portion of a suction port of the hopper. A valve-driving hydraulic cylinder for operating a switching valve provided in, a hydraulic pump, and an A port at one end of the hydraulic cylinder for pressure feeding,
The port is connected to the other end of the hydraulic cylinder for pressure feeding, the P port is connected to the hydraulic pump, and the T port is connected to one end of the intermediate pipe. The one end side and the other end side of the pressure feeding hydraulic cylinder are respectively connected to the intermediate pipes, and the hydraulic pump is connected to the other end side of the pressure feeding hydraulic cylinder and the one end side of the pressure feeding hydraulic cylinder is connected to the intermediate pipe at the second position. A first solenoid valve that communicates and shuts off one end side and the other end side of the hydraulic cylinder for pressure feeding at the neutral position and connects the hydraulic pump to the intermediate pipe; and the A port to one end side of the valve driving hydraulic cylinder. B port to the other end of the valve driving hydraulic cylinder, P port to the other end of the intermediate pipe,
Further, the T port is connected to the oil tank, respectively.
The intermediate pipe is connected to one end side of the valve drive hydraulic cylinder at the position, and the other end side of the valve drive hydraulic cylinder is connected to the oil tank at the position, and the intermediate pipe is connected to the other end side of the valve drive hydraulic cylinder at the second position. A second solenoid valve that connects one end side of the valve driving hydraulic cylinder to the oil tank, disconnects one end side and the other end side of the valve driving hydraulic cylinder at the neutral position, and connects the intermediate pipe to the oil tank, A third solenoid valve provided in the intermediate pipe for shutting off the intermediate pipe; and a hydraulic oil flowing from the first solenoid valve to the second solenoid valve provided in the intermediate pipe between the first solenoid valve and the third solenoid valve. A check valve that allows the flow and stops the reverse flow, a pressure accumulator and a relief valve that are individually branched from the intermediate pipe between the third solenoid valve and the check valve, and the intermediate pipe. Between the above-mentioned accumulator and Was the fourth configuration provided with the electromagnetic valve that blocks the pressure accumulator.
「作用」 流動体を圧送する場合に比較して駆動力が小さくて済
む、圧送シリンダへの流動体の吸入時に、第３電磁弁を
閉、第４電磁弁を開として蓄圧器に作動油を溜め、切換
弁を切り換える際に第３電磁弁を開いて蓄圧器内の作動
油を弁駆動用油圧シリンダに送り、切換弁を早急に切り
換える。[Operation] The driving force is smaller than that in the case of pumping the fluid, and when the fluid is sucked into the pump cylinder, the third solenoid valve is closed and the fourth solenoid valve is opened to supply hydraulic oil to the pressure accumulator. When storing and switching the switching valve, the third solenoid valve is opened to send the hydraulic oil in the accumulator to the valve driving hydraulic cylinder, and the switching valve is switched immediately.
「実施例」 以下、本発明を図面を参照しながら説明する。第１図な
いし第６図は本発明の油圧駆動単筒式ポンプの制御回路
の一実施例を示すものであり、第１図，第２図は本発明
の単筒式ポンプの拡大断面図である。[Examples] Hereinafter, the present invention will be described with reference to the drawings. 1 to 6 show an embodiment of a control circuit for a hydraulically driven single cylinder pump of the present invention, and FIGS. 1 and 2 are enlarged sectional views of the single cylinder pump of the present invention. is there.
図中符号１は単筒式ポンプであり、この単筒式ポンプ１
は圧送シリンダ２と、この圧送シリンダ２の端面2aに固
定された油圧シリンダ３と、この油圧シリンダ３と圧送
シリンダ２との間に端面2aを貫通して設けられたピスト
ン４とからなっており、ピストン４は端面2aを貫通する
軸部4aと、その両端部に設けられて前記圧送シリンダ２
と油圧シリンダ３との内部を往復摺動する受圧部4b,4c
とからなっている。そして、圧送シリンダ２の先端部に
は、上方にホッパー５が連通して取り付けられており、
上記ホッパ５と圧送シリンダ２との連通部（吸入口）6a
には回転弁（切換弁）６が回転自在に設けられている。
また、回転弁６の中心軸線上にはレバー6bが取り付けら
れており、このレバー6bの自由端側には弁駆動用油圧シ
リンダ７のピストンロッド7aが、レバー6bに設けられた
長穴とピストンロッド7aに設けたピンとの係合部を介し
て連結されており、前記弁駆動用油圧シリンダ７を作動
させることによって、回転弁本体6cが回転し、その弁部
6eが前記連通部6aを閉鎖し、圧送シリンダ２の吐出口6d
を開放する位置と、前記連通部6aを開放してホッパ５と
圧送シリンダ２を連通し、前記吐出口6dを閉鎖する位置
（第２図参照）との間で往復回動されるようになってい
る。Reference numeral 1 in the figure denotes a single-cylinder pump, and this single-cylinder pump 1
Is composed of a pressure feeding cylinder 2, a hydraulic cylinder 3 fixed to an end surface 2a of the pressure feeding cylinder 2, and a piston 4 provided between the hydraulic cylinder 3 and the pressure feeding cylinder 2 and penetrating the end surface 2a. The piston 4 has a shaft portion 4a penetrating the end surface 2a and the pressure feeding cylinder 2 provided at both ends thereof.
Pressure receiving parts 4b, 4c that slide back and forth between the inside and the hydraulic cylinder 3.
It consists of A hopper 5 is attached to the tip of the pressure feeding cylinder 2 so as to communicate therewith,
Communication part (suction port) 6a between the hopper 5 and the pressure feeding cylinder 2
A rotary valve (switching valve) 6 is rotatably provided in the.
Further, a lever 6b is attached on the central axis of the rotary valve 6, and a piston rod 7a of a valve driving hydraulic cylinder 7 is provided on the free end side of the lever 6b and a long hole provided on the lever 6b and a piston. The rotary valve body 6c is connected through an engaging portion with a pin provided on the rod 7a, and the rotary valve body 6c is rotated by operating the valve-driving hydraulic cylinder 7.
6e closes the communication part 6a, and the discharge port 6d of the pressure feeding cylinder 2
And a position (see FIG. 2) where the communication part 6a is opened to communicate the hopper 5 and the pressure feeding cylinder 2 and the discharge port 6d is closed (see FIG. 2). ing.
さらに、第３図に示すように、単筒式ポンプ１と弁駆動
用油圧シリンダ７とは、その駆動源である油圧ポンプ８
に一系統の配管によって接続されている。まず、油圧ポ
ンプ８の吐出側は第１の電磁弁９を介して油圧シリンダ
３の一端部に配管10で接続されており、油圧シリンダ３
の他端部は第１の電磁弁９と第２の電磁弁11とを介し弁
駆動用油圧シリンダ７の一端部に配管12によって接続さ
れ、さらに、弁駆動用油圧シリンダ７の他端部は第２の
電磁弁11を介して油槽13に配管14で接続されている。ま
た、第１の電磁弁９と第２の電磁弁11との間に設けられ
た配管（中間配管）12には第３の電磁弁15が介挿されて
おり、第３の電磁弁15と第１の電磁弁９との間の配管12
には、第４の電磁弁16を介して蓄圧器17が配管18で接続
されており、配管18の他端部は逃がし弁19を介して油槽
13に接続されている。なお、配管12には配管18の分岐点
より第１の電磁弁９に近い側に逆止弁20が介挿され、配
管10には安全弁21が付設されている。Further, as shown in FIG. 3, the single-cylinder pump 1 and the valve-driving hydraulic cylinder 7 include a hydraulic pump 8 as a drive source thereof.
Is connected to the pipe by one system. First, the discharge side of the hydraulic pump 8 is connected to one end of the hydraulic cylinder 3 via a first solenoid valve 9 by a pipe 10.
The other end of the valve drive hydraulic cylinder 7 is connected to one end of the valve drive hydraulic cylinder 7 through a first solenoid valve 9 and a second solenoid valve 11 by a pipe 12, and the other end of the valve drive hydraulic cylinder 7 is A pipe 14 is connected to the oil tank 13 via the second solenoid valve 11. A third solenoid valve 15 is inserted in a pipe (intermediate pipe) 12 provided between the first solenoid valve 9 and the second solenoid valve 11, and the third solenoid valve 15 Piping 12 to the first solenoid valve 9
A pressure accumulator 17 is connected to a pipe 18 via a fourth solenoid valve 16, and the other end of the pipe 18 is connected to an oil tank via a relief valve 19.
Connected to 13. A check valve 20 is inserted in the pipe 12 on the side closer to the first solenoid valve 9 than the branch point of the pipe 18, and a safety valve 21 is attached to the pipe 10.
そして、前記第１及び第２の電磁弁9,11は４個のポート
A,B,P,T（符号は図示せず）を持つ４ポート３位置切換
弁が用いられ、第１の電磁弁９は電磁弁コイル9a,9bに
よって切換作動が行なわれ、第２の電磁弁11は電磁弁コ
イル11a,11bによって切換作動が行なわれるようになっ
ているとともに、第３、第４の電磁弁15,16は２ポート
２位置切換弁が用いられ、第３の電磁弁15は電磁弁コイ
ル15a,15bによって切換作動され、第４の電磁弁16は電
磁弁コイル16a,16bによって切換が行なわれるようにな
っている。そして、前記油圧シリンダー３と弁駆動用油
圧シリンダー７とには、始点と終点とにそれぞれ図示し
ない近接スイッチが設けられているとともに、その内部
を移動するピストン４とピストンロッド7aの所定の位置
にはマグネットが埋設されており、これらが油圧シリン
ダ３と弁駆動用油圧シリンダー７内を移動して始点と終
点に位置した際に、前記マグネットに近接スイッチが感
応して電気信号が発信される。発信された電気信号は図
示しないリレーを作動させ、これによって各電磁コイル
9a,9b;11a,11b;15a,15b;16a,16bへ電気を供給し、これ
らを励磁させて各電磁弁9,11;15,16を切換え、所定の回
路を形成するような構成となっている。The first and second solenoid valves 9 and 11 have four ports.
A 4-port 3-position switching valve having A, B, P, T (reference numerals not shown) is used, and the first solenoid valve 9 is switched by solenoid valve coils 9a, 9b, and the second solenoid valve is operated. The valve 11 is designed to be switched by solenoid valve coils 11a and 11b, and the 3rd and 4th solenoid valves 15 and 16 are 2-port 2-position switch valves. Is switched by solenoid valve coils 15a and 15b, and the fourth solenoid valve 16 is switched by solenoid valve coils 16a and 16b. The hydraulic cylinder 3 and the valve-driving hydraulic cylinder 7 are provided with proximity switches (not shown) at the start point and the end point, respectively, and at the predetermined positions of the piston 4 and the piston rod 7a that move therein. Has magnets embedded therein, and when these magnets move in the hydraulic cylinder 3 and the valve-driving hydraulic cylinder 7 and are located at the start point and the end point, the proximity switch is responsive to the magnet to transmit an electric signal. The transmitted electrical signal activates a relay (not shown), which causes each electromagnetic coil to
9a, 9b; 11a, 11b; 15a, 15b; 16a, 16b is supplied with electricity, these are excited to switch each solenoid valve 9, 11; 15, 16 to form a predetermined circuit. ing.
つぎに、前記のように構成された、油圧駆動単筒式ポン
プの制御回路の作用について、その使用例とともに説明
する。Next, the operation of the control circuit of the hydraulically driven single-cylinder pump configured as described above will be described along with its usage example.
（ｉ） 圧送工程 まず、電磁弁コイル9a,15a,16bを励磁させることにより
第１の電磁弁９を順方向に開、第３の電磁弁15を開、第
４の電磁弁16を閉とし、さらに第２の電磁弁11は閉と
し、配管12と配管14とを電磁弁11によって直結させるこ
とにより、第３図に示すような回路が形成される。そし
て、この回路が形成されると、油圧ポンプ８から配管10
を介して圧送シリンダ３の一方に油を圧送し、ピストン
４を矢印Ｘ方向へ移動させ、第１図に示すように、圧送
シリンダ２内の生コンクリートを吐出口6dから圧送す
る。この際、回転弁６はその弁部6eが吐出口6dを開と
し、ホッパー５と圧送シリンダ２との連通部6aを閉塞し
た状態となっている。また、圧送シリンダー３の他方に
ある油は配管12→第２の電磁弁11→配管14を介して油槽
13へ戻され、弁駆動用油圧シリンダ７へは油が供給され
ることなく回転弁６は固定状態となっている。(I) Pressure feeding step First, the first solenoid valve 9 is opened in the forward direction by exciting the solenoid valve coils 9a, 15a, 16b, the third solenoid valve 15 is opened, and the fourth solenoid valve 16 is closed. Further, the second solenoid valve 11 is closed, and the pipe 12 and the pipe 14 are directly connected by the solenoid valve 11 to form a circuit as shown in FIG. Then, when this circuit is formed, the hydraulic pump 8 is connected to the piping 10
The oil is pressure-fed to one of the pressure-feed cylinders 3 via the, the piston 4 is moved in the direction of the arrow X, and the fresh concrete in the pressure-feed cylinder 2 is pressure-fed from the discharge port 6d as shown in FIG. At this time, the valve portion 6e of the rotary valve 6 opens the discharge port 6d and closes the communication portion 6a between the hopper 5 and the pressure feeding cylinder 2. The oil in the other side of the pressure-feeding cylinder 3 passes through the pipe 12 → second solenoid valve 11 → pipe 14 to the oil tank.
Returning to 13, the rotary valve 6 is in a fixed state without oil being supplied to the valve driving hydraulic cylinder 7.
（ii） 弁閉切換工程 つぎに、前記ピストン４が終点（前進端）まで移動して
圧送シリンダー２内の生コンクリートが排出されると、
近接スイッチが応答して電気信号が発信され、これによ
りリレーを介して励磁されていた電磁弁コイル9aの励磁
が解かれ、第１の電磁弁９が閉の状態となって配管10と
12を直結すると同時に、電磁弁コイル11a,16aが励磁さ
れ、第２の電磁弁11は順方向に開、第４の電磁弁16が開
となり、この状態において、後述するように蓄圧器17に
蓄圧された圧油が弁駆動用油圧シリンダー７の一方へ急
速に流入し、これに従ってピストンロッド7aは急速に矢
印Ｘ方向へ移動し、回転弁６を第１図で時計回りに回動
させる。また、これに続いて、前記のように形成された
回路を、油圧ポンプ８から圧送される圧油が油圧ポンプ
８→配管10→第１の電磁弁９→配管12を介して弁駆動用
油圧シリンダ７の一方に圧送され、さらにピストンロッ
ド7aを矢印Ｘ方向へ移動させてレバー6bを回動させ、第
２図に示すように、回転弁６をその弁部6eが吐出口6dを
完全に閉の状態とし、かつホッパー５と圧送シリンダ２
の吸入口6aを開の状態にセットする。また、圧送シリン
ダー３は固定状態となり、弁駆動用油圧シリンダー７の
他方の側へ溜まった油は配管14を介して油槽13へ戻され
る。(Ii) Valve Closed Switching Step Next, when the piston 4 moves to the end point (advance end) and the ready-mixed concrete in the pumping cylinder 2 is discharged,
The proximity switch responds and an electric signal is transmitted, whereby the electromagnetic valve coil 9a that has been excited via the relay is de-excited, and the first electromagnetic valve 9 is closed and the pipe 10 is connected.
At the same time when 12 is directly connected, the solenoid valve coils 11a and 16a are excited, the second solenoid valve 11 is opened in the forward direction, and the fourth solenoid valve 16 is opened. The accumulated pressure oil rapidly flows into one of the valve driving hydraulic cylinders 7, and accordingly, the piston rod 7a rapidly moves in the direction of the arrow X to rotate the rotary valve 6 clockwise in FIG. Further, subsequently to this, in the circuit formed as described above, the pressure oil pumped from the hydraulic pump 8 is supplied to the valve drive hydraulic pressure through the hydraulic pump 8 → the pipe 10 → the first solenoid valve 9 → the pipe 12. The pressure is fed to one side of the cylinder 7, the piston rod 7a is further moved in the direction of the arrow X to rotate the lever 6b, and the valve portion 6e of the rotary valve 6 completely discharges the discharge port 6d as shown in FIG. Closed, hopper 5 and pressure feed cylinder 2
The suction port 6a of is set to the open state. Further, the pressure feeding cylinder 3 is fixed, and the oil accumulated on the other side of the valve driving hydraulic cylinder 7 is returned to the oil tank 13 through the pipe 14.
（iii） 吸入工程 そして、前記弁駆動用油圧シリンダー７のピストンロッ
ド7aが終点まで移動して、回転弁６が完全に回動して吐
出口6dを閉塞した状態になると、近接スイッチが作動し
て信号が発信され、電磁弁コイル11aの励磁が解かれて
第２の電磁弁11が閉となるとともに、電磁弁コイル9b、
15b、16aが励磁されて、第１の電磁弁９はクロス方向に
開、第３の電磁弁15は閉、第４の電磁弁16は開の状態と
なり、第５図に示すような回路が形成される。このよう
な回路が形成されると、油圧ポンプ８から圧送される油
は、油圧ポンプ８→配管10→第１の電磁弁９→配管12側
を通って油圧シリンダー３の他方の側へ供給される。こ
れによりピストン４は矢視Ｙ方向へ移動し、これに伴っ
てホッパー５と連通された圧送シリンダー２内へ生コン
クリートが吸入口6aから吸入される。(Iii) Inhalation step Then, when the piston rod 7a of the valve driving hydraulic cylinder 7 moves to the end point and the rotary valve 6 completely rotates to close the discharge port 6d, the proximity switch operates. Signal is emitted, the excitation of the solenoid valve coil 11a is released, the second solenoid valve 11 is closed, and the solenoid valve coil 9b,
15b and 16a are excited, the first solenoid valve 9 is opened in the cross direction, the third solenoid valve 15 is closed, the fourth solenoid valve 16 is in the open state, and the circuit as shown in FIG. It is formed. When such a circuit is formed, the oil pumped from the hydraulic pump 8 is supplied to the other side of the hydraulic cylinder 3 through the hydraulic pump 8 → the pipe 10 → the first solenoid valve 9 → the pipe 12 side. It As a result, the piston 4 moves in the Y direction as viewed from the arrow, and accordingly, fresh concrete is sucked into the pressure-feeding cylinder 2 that is in communication with the hopper 5 through the suction port 6a.
この際、油圧シリンダー３の一方の側に溜まった油は配
管10から配管12を介して蓄圧器17内へ蓄圧された後、配
管12内が逃がし弁19の設定圧以上になると逃がし弁19が
開となり、油は配管18を介して油槽13へ戻る。また、電
磁弁11は閉となっているため、弁駆動用油圧シリンダー
７と回転弁6cは固定状態となる。At this time, the oil accumulated on one side of the hydraulic cylinder 3 is accumulated in the pressure accumulator 17 from the pipe 10 through the pipe 12, and then the relief valve 19 is released when the pressure in the pipe 12 exceeds the set pressure of the relief valve 19. It opens and the oil returns to the oil tank 13 via the pipe 18. Further, since the solenoid valve 11 is closed, the valve driving hydraulic cylinder 7 and the rotary valve 6c are in a fixed state.
（iv） 弁開切換工程 つぎに、圧送シリンダー２内のピストン４が始点の位置
まで戻ると、信号が発信され電磁弁コイル9bの励磁が解
除され、第１の電磁弁９は閉の状態となり、油圧シリン
ダー３は固定状態となると同時に、電磁弁コイル11b,15
aが励磁されて第２の電磁弁11はクロス方向に開、第３
の電磁弁15は開の状態となり、この状態において、蓄圧
器17内の圧油が配管12から電磁弁11を介して配管14を通
り、弁駆動用油圧シリンダー７の他方に急速に流入し、
ピストンロッド7aを矢印Ｙ方向へ移動させ、これによっ
て回転弁６をその弁部6eから吐出口6dを急速に開く状態
へ回動させる。これに続いて、前記のように形成された
回路を、油圧ポンプ８によって供給される圧油が油圧ポ
ンプ８→配管10→第１の電磁弁９→配管12→第２の電磁
弁11→配管14を介して、弁駆動用油圧シリンダー７の他
方側へ圧送され、引き続き弁駆動用油圧シリンダー７を
駆動させて吐出口6dを完全に開の状態とする。なお、弁
駆動用油圧シリンダー７の一方の側にある油は配管12か
ら電磁弁11を介して配管14を通り、油槽13へ戻される。(Iv) Valve open switching step Next, when the piston 4 in the pressure feeding cylinder 2 returns to the position of the starting point, a signal is transmitted, the excitation of the solenoid valve coil 9b is released, and the first solenoid valve 9 is closed. , The hydraulic cylinder 3 is fixed and the solenoid valve coils 11b, 15
When a is excited, the second solenoid valve 11 opens in the cross direction and the third solenoid valve opens.
The solenoid valve 15 is opened, and in this state, the pressure oil in the pressure accumulator 17 rapidly flows from the pipe 12 through the solenoid valve 11 through the pipe 14 into the other of the valve driving hydraulic cylinders 7,
The piston rod 7a is moved in the direction of the arrow Y, whereby the rotary valve 6 is rotated from its valve portion 6e to a state in which the discharge port 6d is rapidly opened. Following this, in the circuit formed as described above, the pressure oil supplied by the hydraulic pump 8 is changed by the hydraulic pump 8 → the pipe 10 → the first solenoid valve 9 → the pipe 12 → the second solenoid valve 11 → the pipe. It is pressure-fed to the other side of the valve-driving hydraulic cylinder 7 via 14, and then the valve-driving hydraulic cylinder 7 is driven to completely open the discharge port 6d. The oil on one side of the valve-driving hydraulic cylinder 7 is returned from the pipe 12 to the oil tank 13 through the solenoid valve 11 and the pipe 14.
そして、前記ピストンロッド7aが完全に始点まで戻る
と、近接スイッチが作動して信号が発信され、電磁弁コ
イル16bが励磁されて第４の電磁弁16が閉となり、これ
によって蓄圧器17内への圧油の貯留が完了されるととも
に、他の電磁弁9a,15aが励磁されて作動するとともに、
電磁弁コイル11bが消磁され第２の電磁弁11が閉となっ
て前記第３図に示す圧送状態の回路が形成され、これに
よって前記（ｉ）の圧送工程から、以下（ii）（iii）
（iv）の工程が逐次繰り返されことになる。なお、配管
12に介挿された逆止弁20は配管12中の圧油が油圧シリン
ダ３側へ逆流するのを防止するためのものであり、安全
弁21は配管10内の圧力が設定された圧力以上になった際
に、作動して配管10内の圧油を油槽13へ戻すためのもの
である。Then, when the piston rod 7a is completely returned to the starting point, the proximity switch is actuated, a signal is transmitted, the solenoid valve coil 16b is excited, and the fourth solenoid valve 16 is closed, whereby the pressure is stored in the pressure accumulator 17. When the pressure oil is completely stored, the other solenoid valves 9a and 15a are excited and operate, and
The solenoid valve coil 11b is demagnetized and the second solenoid valve 11 is closed to form the circuit in the pressure-feeding state shown in FIG. 3, whereby from the pressure-feeding step (i), the following (ii) (iii)
The step (iv) will be sequentially repeated. Note that piping
The check valve 20 inserted in 12 is for preventing pressure oil in the pipe 12 from flowing back to the hydraulic cylinder 3 side, and the safety valve 21 makes the pressure in the pipe 10 equal to or higher than the set pressure. It is for returning the pressure oil in the pipe 10 to the oil tank 13 when it becomes low.
このように、上記実施例においては第１の電磁弁９と第
２の電磁弁11との間に設けられた配管12に、第３の電磁
弁15を介挿するとともに、第３の電磁弁15と第１の電磁
弁９との間に第４の電磁弁16を介して蓄圧器17を接続
し、前記第１、第２、第３、第４の電磁弁9,11,15,16が
前記油圧シリンダー３内を移動するピストン４と弁駆動
用油圧シリンダー７内を移動するピストンロッド7aとの
位置関係によって発信されるようにした電気信号で制御
され、駆動力を余り必要としないホッパー５から圧送シ
リンダー２内へ生コンクリートを吸入する工程におい
て、蓄圧器内へ一時的に圧油を溜めておき、回転弁を切
り替える工程で、前記蓄圧器内の圧油を早急に弁駆動用
油圧シリンダー内へ放出させて回転弁を単時間の内に切
り替えるようにしたものであるので、駆動源である油圧
ポンプ８と生コンクリートを圧送する油圧駆動単筒式ポ
ンプ１とが離れた場所にあっても、回転弁６を短時間の
内に切換えることができ、その結果、一系統でかつ高揚
程の配管系であっても油圧駆動単筒式ポンプ１で流動体
を継続的に圧送することができるようになり、コンクリ
ートの圧送量を向上させることができコンクリートポン
プの効率を高めることができる。As described above, in the above embodiment, the third solenoid valve 15 is inserted into the pipe 12 provided between the first solenoid valve 9 and the second solenoid valve 11, and the third solenoid valve 15 is inserted. A pressure accumulator 17 is connected between the first solenoid valve 9 and the first solenoid valve 9 via a fourth solenoid valve 16, and the first, second, third, and fourth solenoid valves 9, 11, 15, 16 are connected. Is controlled by an electric signal generated by the positional relationship between the piston 4 moving in the hydraulic cylinder 3 and the piston rod 7a moving in the valve driving hydraulic cylinder 7, and the hopper does not require much driving force. In the step of sucking the fresh concrete from the pressure feeding cylinder 2 into the pressure feeding cylinder 2, the pressure oil is temporarily stored in the pressure accumulator and the rotary valve is switched. It is designed to release into the cylinder and switch the rotary valve within a single time. Thus, even if the hydraulic pump 8 that is the drive source and the hydraulically driven single-cylinder pump 1 that pumps the ready-mixed concrete are located far from each other, the rotary valve 6 can be switched within a short time, and as a result, Even if it is a system and a piping system with a high head, the hydraulically driven single-cylinder pump 1 can continuously pump the fluid, so that the concrete pumping amount can be improved and the efficiency of the concrete pump can be improved. Can be increased.
なお、上記以外の他の実施例、あるいは技術的事項につ
いて以下に記載する。In addition, other embodiments and technical matters other than the above will be described below.
（ｉ） 前記実施例においては、単筒式ポンプで圧送す
る流動体を生コンクリートとしたが、これに限られるこ
となく、流動状のものであればどのようなものにでも適
用することができる。(I) In the above-mentioned embodiment, the concrete is used as the fluid to be pumped by the single-cylinder pump. However, the fluid is not limited to this, and any fluid can be applied. .
（ii） 前記実施例においては、電磁弁を駆動するため
の信号を、油圧シリンダ３とピストン４及び弁駆動用油
圧シリンダ７とピストンロッド7aとの位置関係によって
発信させるようにしたが、これに限られることなく、所
定の時間に各電磁弁コイルへ電流が流れ、電磁弁を切り
換えるようにした機構であればどのようなものでもよ
い。(Ii) In the above embodiment, the signal for driving the solenoid valve is transmitted by the positional relationship between the hydraulic cylinder 3, the piston 4, the valve driving hydraulic cylinder 7 and the piston rod 7a. The mechanism is not limited, and any mechanism may be used as long as a current flows through each solenoid valve coil at a predetermined time and the solenoid valves are switched.
（iii） 前記実施例ではホッパ５と圧送シリンダ２と
の連通部（吸入口）6aの開閉と圧送シリンダ２の吐出口
6dの開閉の切り換えを行う切換弁を回転弁６として構成
したが、これに限らず、往復摺動するスライド弁として
構成してもよいし、その他の構造のものであってもよ
い。(Iii) In the above-described embodiment, the opening / closing of the communication portion (suction port) 6a between the hopper 5 and the pressure feeding cylinder 2 and the discharge port of the pressure feeding cylinder 2 are performed.
Although the switching valve for switching the opening and closing of 6d is configured as the rotary valve 6, the present invention is not limited to this, and may be configured as a slide valve that slides back and forth, or may have another structure.
（iv） 油圧ポンプ８を含む専用の油圧ユニットに代え
て、休車時のパワーショベル等の建設、作業機械等の油
圧動力源を有効に利用して単筒式ポンプを駆動すること
ができる。(Iv) Instead of a dedicated hydraulic unit including the hydraulic pump 8, it is possible to drive a single-cylinder pump by effectively using a hydraulic power source such as construction of a power shovel and a working machine when the vehicle is at rest.
「発明の効果」 以上詳細に説明したように、本発明の油圧駆動用単筒式
ポンプの制御回路は、ホッパの流動体を吸引して圧送す
る圧送シリンダを動かす圧送用油圧シリンダと、上記ホ
ッパの吸入口の部分に設けられた切換弁を作動させる弁
駆動用油圧シリンダと、油圧ポンプと、Ａポートを上記
圧送用油圧シリンダの一端側に、Ｂポートを圧送用油圧
シリンダの他端側に、またＰポートを上記油圧ポンプ
に、更にＴポートを中間配管の一端にそれぞれ接続して
設けられ、第１位置において上記油圧ポンプを圧送用油
圧シリンダの一端側にまた圧送用油圧シリンダの他端側
を上記中間配管にそれぞれ連絡し、第２位置において油
圧ポンプを圧送用油圧シリンダの他端側にまた圧送用油
圧シリンダの一端側を中間配管にそれぞれ連絡し、中立
位置において圧送用油圧シリンダの一端側と他端側とを
遮断するとともに油圧ポンプを中間配管に連絡する第１
電磁弁と、Ａポートを上記弁駆動用油圧シリンダの一端
側に、Ｂポートを弁駆動用油圧シリンダの他端側に、ま
たＰポートを上記中間配管の他端に、更にＴポートを油
槽にそれぞれ接続して設けられ、第１位置において上記
中間配管を弁駆動用油圧シリンダの一端側にまた弁駆動
用油圧シリンダの他端側を上記油槽にそれぞれ連絡し、
第２位置において中間配管を弁駆動用油圧シリンダの他
端側にまた弁駆動用油圧シリンダの一端側を油槽にそれ
ぞれ連絡し、中立位置において弁駆動用油圧シリンダの
一端側と他端側とを遮断するとともに中間配管を油槽に
連絡する第２電磁弁と、上記中間配管に設けられ該中間
配管を遮断する第３電磁弁と、上記第１電磁弁と上記第
３電磁弁の間において中間配管に設けられ第１電磁弁か
ら第２電磁弁に向う作動油の流れを許してその逆の流れ
を止める逆止弁と、上記第３電磁弁と上記逆止弁との間
において中間配管から個々に分岐して設けられた蓄圧器
及び逃がし弁と、上記中間配管と上記蓄圧器との間に設
けられ蓄圧器を遮断する第４電磁弁とを具備した構成と
されているので、駆動源である油圧ポンプの流量が少な
い場合であっても、切換弁を短時間の内に切換えること
ができ、その結果、一系統でかつ高揚程の配管系であっ
ても単筒式ポンプで流動体を継続的に圧送することがで
きるようになり、流動体の圧送量を向上させることがで
き単筒式ポンプの効率を高めることのできる効果を奏す
る。しかも、流動体を圧送する場合に比べて駆動力が小
さくて済む、圧送シリンダへの流動体の吸込み時に、蓄
圧器に作動油を供給することができるので、油圧ポンプ
の負荷変動を小さく抑えて作業効率を高めることができ
る。"Effects of the Invention" As described in detail above, the control circuit of the hydraulically driven single-cylinder pump of the present invention includes a pressure-feed hydraulic cylinder that moves a pressure-feed cylinder that sucks and pressure-feeds the fluid of the hopper, and the hopper. A hydraulic cylinder for driving a valve that operates a switching valve provided at the suction port of the, a hydraulic pump, an A port on one side of the hydraulic cylinder for pressure feeding, and a B port on the other side of the hydraulic cylinder for pressure feeding. The P port is connected to the hydraulic pump, and the T port is connected to one end of the intermediate pipe. The hydraulic pump is connected to one end of the pressure feeding hydraulic cylinder and the other end of the pressure feeding hydraulic cylinder at the first position. Side to the intermediate pipe, the hydraulic pump is connected to the other end of the pressure-feed hydraulic cylinder at the second position, and one end of the pressure-feed hydraulic cylinder is connected to the intermediate pipe. First disconnecting one end side and the other end side of the hydraulic cylinder for pressure feeding and connecting the hydraulic pump to the intermediate pipe
The solenoid valve and the A port are on one end side of the valve driving hydraulic cylinder, the B port is on the other end side of the valve driving hydraulic cylinder, the P port is on the other end of the intermediate pipe, and the T port is on the oil tank. In the first position, the intermediate pipe is connected to each other, and the intermediate pipe is connected to one end of the valve driving hydraulic cylinder, and the other end of the valve driving hydraulic cylinder is connected to the oil tank.
In the second position, the intermediate pipe is connected to the other end side of the valve driving hydraulic cylinder, and one end side of the valve driving hydraulic cylinder is connected to the oil tank, respectively, and one end side and the other end side of the valve driving hydraulic cylinder are connected in the neutral position. A second solenoid valve that shuts off and connects the intermediate pipe to the oil tank, a third solenoid valve that is provided in the intermediate pipe and shuts off the intermediate pipe, and an intermediate pipe between the first solenoid valve and the third solenoid valve. A check valve that is provided in the first solenoid valve to allow the flow of hydraulic oil toward the second solenoid valve and stops the reverse flow thereof; and an intermediate pipe between the third solenoid valve and the check valve. Since it is configured to include a pressure accumulator and a relief valve that are provided in a branched manner, and a fourth electromagnetic valve that is provided between the intermediate pipe and the pressure accumulator and that shuts off the pressure accumulator, a drive source is used. Even if the flow rate of a certain hydraulic pump is low The switching valve can be switched within a short period of time, and as a result, the fluid can be continuously pumped by a single-cylinder pump even in a single system and a piping system with a high head. It is possible to improve the pumping amount of the body and to improve the efficiency of the single-cylinder pump. Moreover, the driving force is smaller than that in the case of pumping the fluid, and the hydraulic oil can be supplied to the accumulator when the fluid is sucked into the pump cylinder, so the load fluctuation of the hydraulic pump can be kept small. Work efficiency can be improved.
第１図ないし第６図は本発明の油圧駆動用ポンプの制御
回路の一実施例を示すものであり、第１図は回転弁が吸
入口側を閉、圧送シリンダーの吐出口側を開の状態に回
動され、圧送シリンダー内の流動体がピストンによって
圧送されているところを示す単筒式ポンプの側断面図、
第２図は回転弁が吸込口側を開、圧送シリンダーの吐出
口を閉の状態に回動され、圧送シリンダー内に流動体が
吸入されているところを示す単筒式ポンプの側断面図、
第３図ないし第６図は電磁弁を切換えて各工程の回路が
形成された状態を示す図であり、第３図は圧送工程の回
路を説明するための説明図であり、第４図は蓄圧器から
単時間の内に弁駆動用油圧シリンダー内へ圧油が圧送さ
れて回転弁を第２図の閉の状態に切り換えているところ
を説明するための説明図、第５図は圧送シリンダー内へ
流動体を吸入しているところを説明するための説明図、
第６図は蓄圧器から短時間の内に弁駆動用油圧シリンダ
ー内へ圧油が圧送されて回転弁を第１図の開の状態に切
り換えているところを説明するための説明図、第７図は
従来の油圧駆動式ポンプの制御回路の説明図である。 １……単筒式ポンプ、２……圧送シリンダー、３……油
圧シリンダー、４……ピストン、５……ホッパ、６……
回転弁（切換弁）、6a……吸入口、6d……吐出口、７…
…弁駆動用油圧シリンダー、7a……ピストンロッド、８
……油圧ポンプ、９……第１の電磁弁、11……第２の電
磁弁、15……第３の電磁弁、16……第４の電磁弁、10,1
2,14,18……配管。1 to 6 show an embodiment of a control circuit for a hydraulic drive pump according to the present invention. In FIG. 1, the rotary valve closes the intake port side and opens the discharge port side of the pressure feeding cylinder. Side sectional view of the single-cylinder pump, which shows that the fluid in the pressure-feeding cylinder is being pressure-fed by the piston when rotated into a state.
FIG. 2 is a side sectional view of the single-cylinder pump showing that the rotary valve is rotated so that the suction port side is opened and the discharge port of the pressure feeding cylinder is closed, and the fluid is sucked into the pressure feeding cylinder.
FIGS. 3 to 6 are views showing a state in which circuits of respective steps are formed by switching solenoid valves, FIG. 3 is an explanatory view for explaining circuits of a pressure feeding step, and FIG. FIG. 5 is an explanatory view for explaining that the pressure oil is pumped from the pressure accumulator into the valve driving hydraulic cylinder within a single time to switch the rotary valve to the closed state of FIG. 2, and FIG. Explanatory diagram for explaining the inhalation of the fluid into the inside,
FIG. 6 is an explanatory view for explaining that pressure oil is pumped from the pressure accumulator into the valve-driving hydraulic cylinder within a short period of time to switch the rotary valve to the open state shown in FIG. 1; The figure is an explanatory diagram of a control circuit of a conventional hydraulic drive pump. 1 ... Single cylinder type pump, 2 ... Pressurizing cylinder, 3 ... Hydraulic cylinder, 4 ... Piston, 5 ... Hopper, 6 ...
Rotary valve (switching valve), 6a ... intake port, 6d ... discharge port, 7 ...
… Valve drive hydraulic cylinder, 7a …… Piston rod, 8
... hydraulic pump, 9 ... first solenoid valve, 11 ... second solenoid valve, 15 ... third solenoid valve, 16 ... fourth solenoid valve, 10,1
2,14,18 …… Piping.
Claims (1)
圧送シリンダ（２）を動かす圧送用油圧シリンダ（３）
と、上記ホッパ（５）の吸入口（6a）の部分に設けられ
た切換弁（６）を作動させる弁駆動用油圧シリンダ
（７）と、油圧ポンプ（８）と、Ａポートを上記圧送用
油圧シリンダ（３）の一端側に、Ｂポートを圧送用油圧
シリンダ（３）の他端側に、またＰポートを上記油圧ポ
ンプ（８）に、更にＴポートを中間配管（12）の一端に
それぞれ接続して設けられ、第１位置において上記油圧
ポンプ（８）を圧送用油圧シリンダ（３）の一端側にま
た圧送用油圧シリンダ（３）の他端側を上記中間配管
（12）にそれぞれ連絡し、第２位置において油圧ポンプ
（８）を圧送用油圧シリンダ（３）の他端側にまた圧送
用油圧シリンダ（３）の一端側を中間配管（12）にそれ
ぞれ連絡し、中立位置において圧送用油圧シリンダ
（３）の一端側と他端側とを遮断するとともに油圧ポン
プ（８）を中間配管（12）に連絡する第１電磁弁（９）
と、Ａポートを上記弁駆動用油圧シリンダ（７）の一端
側に、Ｂポートを弁駆動用油圧シリンダ（７）の他端側
に、またＰポートを上記中間配管の他端に、更にＴポー
トを油槽（13）にそれぞれ接続して設けられ、第１位置
において上記中間配管（12）を弁駆動用油圧シリンダ
（７）の一端側にまた弁駆動用油圧シリンダ（７）の他
端側を上記油槽（13）にそれぞれ連絡し、第２位置にお
いて中間配管（12）を弁駆動用油圧シリンダ（７）の他
端側にまた弁駆動用油圧シリンダ（７）の一端側を油槽
（13）にそれぞれ連絡し、中立位置において弁駆動用油
圧シリンダ（７）の一端側と他端側とを遮断するととも
に中間配管（12）を油槽（13）に連絡する第２電磁弁
（11）と、上記中間配管（12）に設けられ該中間配管
（12）を遮断する第３電磁弁（15）と、上記第１電磁弁
（９）と上記第３電磁弁（15）の間において中間配管
（12）に設けられ第１電磁弁（９）から第２電磁弁（1
1）に向う作動油の流れを許してその逆の流れを止める
逆止弁（20）と、上記第３電磁弁（15）と上記逆止弁
（20）との間において中間配管（12）から個々に分岐し
て設けられた蓄圧器（17）及び逃がし弁（19）と、上記
中間配管（12）と上記蓄圧器（17）との間に設けられ蓄
圧器（17）を遮断する第４電磁弁（16）とを具備したこ
とを特徴とする油圧駆動単筒式ポンプの制御回路。1. A hydraulic cylinder (3) for pressure feeding for moving a pressure feeding cylinder (2) for sucking and feeding the fluid of a hopper (5).
And a valve-driving hydraulic cylinder (7) for operating a switching valve (6) provided in the suction port (6a) of the hopper (5), a hydraulic pump (8), and an A port for the above-mentioned pressure feeding. At one end of the hydraulic cylinder (3), the B port is at the other end of the hydraulic cylinder (3) for pressure feeding, the P port is at the hydraulic pump (8), and the T port is at one end of the intermediate pipe (12). In the first position, the hydraulic pump (8) is connected to each other, and the hydraulic pump (8) is connected to one end side of the hydraulic cylinder (3) for pumping and the other end side of the hydraulic cylinder (3) for pumping is connected to the intermediate pipe (12). In the second position, the hydraulic pump (8) is connected to the other end side of the hydraulic cylinder (3) for pressure feed, and one end side of the hydraulic cylinder (3) for pressure feed is connected to the intermediate pipe (12). Shields one end side and the other end side of the hydraulic cylinder (3) for pressure feeding First electromagnetic valve which communicates hydraulic pump (8) to the intermediate pipe (12) as well as (9)
And A port to one end side of the valve drive hydraulic cylinder (7), B port to the other end side of the valve drive hydraulic cylinder (7), P port to the other end of the intermediate pipe, and T The ports are respectively connected to the oil tanks (13), and at the first position, the intermediate pipe (12) is connected to one end of the valve driving hydraulic cylinder (7) and the other end of the valve driving hydraulic cylinder (7). To the oil tank (13), and at the second position, the intermediate pipe (12) is connected to the other end of the valve driving hydraulic cylinder (7) and one end of the valve driving hydraulic cylinder (7) is connected to the oil tank (13). ) And a second solenoid valve (11) for disconnecting one end side and the other end side of the valve driving hydraulic cylinder (7) in the neutral position and for connecting the intermediate pipe (12) to the oil tank (13). A third solenoid valve (15) provided on the intermediate pipe (12) for shutting off the intermediate pipe (12) ) And the first solenoid valve (9) to the second solenoid valve (1) provided in the intermediate pipe (12) between the first solenoid valve (9) and the third solenoid valve (15).
The check valve (20) that allows the flow of hydraulic oil toward 1) and stops the reverse flow, and the intermediate pipe (12) between the third solenoid valve (15) and the check valve (20). A pressure accumulator (17) and a relief valve (19) that are individually branched from the intermediate pipe (12) and the pressure accumulator (17) to shut off the accumulator (17). A control circuit for a hydraulically driven single-cylinder pump, which is equipped with four solenoid valves (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62172606A JPH0781552B2 (en) | 1987-07-10 | 1987-07-10 | Control circuit for hydraulically driven single cylinder pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62172606A JPH0781552B2 (en) | 1987-07-10 | 1987-07-10 | Control circuit for hydraulically driven single cylinder pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6419185A JPS6419185A (en) | 1989-01-23 |
| JPH0781552B2 true JPH0781552B2 (en) | 1995-08-30 |
Family
ID=15944983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62172606A Expired - Fee Related JPH0781552B2 (en) | 1987-07-10 | 1987-07-10 | Control circuit for hydraulically driven single cylinder pump |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0781552B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004027706A1 (en) | 2004-06-07 | 2005-12-22 | BSH Bosch und Siemens Hausgeräte GmbH | Evaporator for a refrigerator and method for its production |
| US10161421B2 (en) | 2015-02-03 | 2018-12-25 | Eli Oklejas, Jr. | Method and system for injecting a process fluid using a high pressure drive fluid |
| US10138877B2 (en) | 2016-11-11 | 2018-11-27 | Vector Technologies Llc | Method and system for intensifying slurry pressure |
| US10766009B2 (en) | 2017-02-10 | 2020-09-08 | Vector Technologies Llc | Slurry injection system and method for operating the same |
| US10155205B2 (en) | 2017-02-10 | 2018-12-18 | Vector Technologies Llc | Method and system for injecting slurry using concentrated slurry pressurization |
| US10837465B2 (en) | 2017-02-10 | 2020-11-17 | Vector Technologies Llc | Elongated tank for use in injecting slurry |
| US10156237B2 (en) | 2017-02-10 | 2018-12-18 | Vector Technologies Llc | Method and system for injecting slurry using concentrated slurry pressurization |
| US10156132B2 (en) | 2017-02-10 | 2018-12-18 | Vector Technologies Llc | Method and system for injecting slurry using two tanks with valve timing overlap |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6135742U (en) * | 1984-08-03 | 1986-03-05 | 株式会社 呉英製作所 | cutting wheel |
-
1987
- 1987-07-10 JP JP62172606A patent/JPH0781552B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6419185A (en) | 1989-01-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2011113356A1 (en) | Concrete pumping structure and control method thereof | |
| JPH0781552B2 (en) | Control circuit for hydraulically driven single cylinder pump | |
| CN109779987B (en) | Road sweeper and hydraulic driving system thereof | |
| CN103089738A (en) | Straight line walking valve and controlling system achieving excavator straight line walking | |
| EP3232057B1 (en) | Method for transmitting or conveying fluid or semi-fluid materials by means of a double piston pump and double piston pump therefor | |
| JP2022507986A (en) | Regenerative control hydraulic system | |
| CN105829614B (en) | The loop circuit hydraulic system of engineering machinery | |
| JPH07167107A (en) | Quick drop circuit | |
| GB2554683A (en) | Hydraulic systems for construction machinery | |
| KR20110073892A (en) | Pump control actuation system of construction machinery | |
| JP6282127B2 (en) | hydraulic unit | |
| JP3626872B2 (en) | Fluid pressure pump and its hydraulic cylinder | |
| CA2567445A1 (en) | Drive device for a dual-cylinder slurry pump and method for operating said pump | |
| CN108430828B (en) | Stirring roller driving device | |
| JPH0633767B2 (en) | Slurry pump | |
| WO2000055509A1 (en) | Actuator controller | |
| CN108385767A (en) | Automatically controlled positive-flow hydraulic system | |
| CN113950555A (en) | Hydraulic machine | |
| CN215058548U (en) | Hydraulic distribution valve system for integrating air compressor and commercial concrete pumping functions of pile filling machine | |
| CN219345106U (en) | Control system is relieved in wheel limit electric drive speed reducer hydraulic braking | |
| JPH0886275A (en) | Control circuit for oscillation cylinder for oscillation valve type concrete pump | |
| CN215486916U (en) | Hydraulic control system for rotation of assembling machine | |
| SU1490235A1 (en) | Hydraulic drive for control of working equipment of front-end loader | |
| CN216895102U (en) | High-low pressure switching device and concrete pumping equipment with same | |
| JP2873399B2 (en) | Hydraulic control device for construction machinery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |