JP2005254267A - Hydraulic shear for cutting cast slab, and method for cutting cast slab - Google Patents

Hydraulic shear for cutting cast slab, and method for cutting cast slab Download PDF

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JP2005254267A
JP2005254267A JP2004067499A JP2004067499A JP2005254267A JP 2005254267 A JP2005254267 A JP 2005254267A JP 2004067499 A JP2004067499 A JP 2004067499A JP 2004067499 A JP2004067499 A JP 2004067499A JP 2005254267 A JP2005254267 A JP 2005254267A
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hydraulic
valve
slab
hydraulic cylinder
sectional area
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Hiromi Hara
広実 原
Masanobu Hayama
正信 葉山
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Nippon Steel Corp
Nippon Steel Plant Designing Corp
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Nittetsu Plant Designing Corp
Nippon Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic shear for cutting a cast slab which requires no wide setting area, enables the setting cost and running cost thereof to be reduced and is adaptive to the size of the cut cast slab and to provide a method for cutting the cast slab. <P>SOLUTION: The hydraulic shear 10 for cutting the cast slab 11 produced in a continuous casting facility is provided with; a small capacity and high pressure hydraulic pump 12 for supplying hydraulic oil into a hydraulic circuit; a single-rod double-acting hydraulic cylinder 14 operated with the hydraulic oil supplied from the hydraulic pump 12; and a hydraulic circuit switching device for switching piping connecting the hydraulic pump 12 to the hydraulic cylinder 14, to a differential acting circuit driven with the cross-sectional area of a rod 16 in the hydraulic cylinder 14 in the case that the cross sectional area of the cast slab 11 is not larger than a prescribed value; and to an opening circuit driven with the pressure in the cross-sectional area of a piston 15 in the hydraulic cylinder 14 in the case that the cross sectional area of the cast slab 11 exceeds a prescribed value. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、小容量で高圧の油圧ポンプを備えた鋳片切断用の油圧シャー及び鋳片の切断方法に関する。 The present invention relates to a slab cutting hydraulic shear including a small-capacity, high-pressure hydraulic pump and a slab cutting method.

従来、連続鋳造設備において、ピンチロールによって引き抜かれた鋳片は、油圧シャー、ガス切断機等の鋳片切断装置によって所定の長さに切断されている（例えば、特許文献１参照）。ここで、鋳片切断装置として、油圧シャーを用いた場合、断面積が小さい鋳片（以下、小鋳片という）の切断では、鋳造速度が速いので高速切断が必要となるが、切断面積が小さいため切断に必要な推力は小さくてよく、また、断面積が大きい鋳片（以下、大鋳片という）の切断では、鋳造速度が遅いので低速切断でよいが、切断面積が大きいため大きな推力を必要とする。 Conventionally, in a continuous casting facility, a slab drawn by a pinch roll is cut into a predetermined length by a slab cutting device such as a hydraulic shear or a gas cutter (see, for example, Patent Document 1). Here, when a hydraulic shear is used as the slab cutting device, cutting of a slab having a small cross-sectional area (hereinafter referred to as a small slab) requires high-speed cutting because the casting speed is high, but the cutting area is large. Because it is small, the thrust required for cutting may be small, and in the cutting of a slab having a large cross-sectional area (hereinafter referred to as a large slab), the casting speed is slow, so low-speed cutting is sufficient, but the large cutting area results in a large thrust Need.

このため、図２に示すように、大鋳片を切断するための小容量（すなわち、低速）で、高圧（すなわち、大推力）の油圧ポンプ４０と、小鋳片を切断するための大容量（すなわち、高速）で低圧（すなわち、小推力）の油圧ポンプ４１とを備え、それぞれの油圧ポンプ４０、４１を鋳片のサイズによって切り替えて使用する油圧シャー４２が知られている。また、図３に示すように、大鋳片及び小鋳片の両方が切断可能な大容量で高圧（すなわち、高速で大推力）の油圧ポンプ４３を１つ備えた油圧シャー４４も知られている。 For this reason, as shown in FIG. 2, a small capacity (ie, low speed) hydraulic pump 40 for cutting large cast pieces and a high pressure (ie, large thrust) hydraulic pump 40 and a large capacity for cutting small cast pieces. There is known a hydraulic shear 42 that includes a hydraulic pump 41 (that is, a high speed) and a low pressure (that is, a small thrust), and switches the hydraulic pumps 40 and 41 according to the size of a slab. Further, as shown in FIG. 3, a hydraulic shear 44 having one large-capacity, high-pressure (ie, high-speed, large thrust) hydraulic pump 43 capable of cutting both large slabs and small slabs is also known. Yes.

実用新案登録第２５９６８３７号公報Utility Model Registration No. 2596837

しかしながら、図２の油圧シャー４２は、２つの油圧ポンプ４０、４１を使用するため装置が大きくなり、コストが高くなるという問題があった。また、図３の油圧シャー４４では、大容量の油圧ポンプ４３を使用するため広い設置面積が必要となり、また、大鋳片を切断するには必要な切断速度以上の能力を有しており、また、小鋳片を切断するには推力が大きい過ぎるので、切断する鋳片に対して油圧ポンプの能力が必要以上に高く無駄が多いという問題があった。
本発明はかかる事情に鑑みてなされたもので、広い設置面積を必要とせず、設置コスト及びランニングコストを低減でき、切断する鋳片サイズに対応した鋳片切断用の油圧シャー及び鋳片の切断方法を提供することを目的とする。 However, since the hydraulic shear 42 in FIG. 2 uses two hydraulic pumps 40 and 41, there is a problem that the apparatus becomes large and the cost becomes high. In addition, the hydraulic shear 44 in FIG. 3 requires a large installation area because it uses a large-capacity hydraulic pump 43, and has a capacity higher than the cutting speed necessary for cutting large cast pieces. Further, since the thrust is too large to cut the small slab, there is a problem that the capacity of the hydraulic pump is higher than necessary and wasteful with respect to the slab to be cut.
The present invention has been made in view of such circumstances, and does not require a large installation area, can reduce installation costs and running costs, and cuts a slab and a hydraulic shear for cutting a slab corresponding to a slab size to be cut. It aims to provide a method.

前記目的に沿う請求項１記載の鋳片切断用の油圧シャーは、連続鋳造設備で製造される鋳片を切断する油圧シャーにおいて、
油圧回路に作動油を供給する小容量で高圧の油圧ポンプと、
前記油圧ポンプから供給される前記作動油によって作動し、前記鋳片の切断用の移動刃を駆動するシングルロッド複動型の油圧シリンダと、
前記油圧ポンプと前記油圧シリンダとを繋ぐ配管を、前記鋳片の断面積が所定値以下の場合には前記油圧シリンダのロッドの断面積（ヘッド側受圧面積−ロッド側受圧面積）によって駆動する差動回路に、前記鋳片の断面積が所定値を超える場合には前記油圧シリンダのピストンの断面積の圧力によって駆動するオープン回路に、それぞれ切り替える油圧回路切替装置とを有する。 The hydraulic shear for slab cutting according to claim 1, which meets the object, is a hydraulic shear for cutting a slab manufactured by a continuous casting facility.
A small-capacity, high-pressure hydraulic pump that supplies hydraulic fluid to the hydraulic circuit;
A single-rod double-acting hydraulic cylinder that operates by the hydraulic oil supplied from the hydraulic pump and drives a moving blade for cutting the slab;
A difference in which a pipe connecting the hydraulic pump and the hydraulic cylinder is driven by a cross-sectional area of the rod of the hydraulic cylinder (head-side pressure receiving area−rod-side pressure receiving area) when the cross-sectional area of the slab is equal to or smaller than a predetermined value. The dynamic circuit includes a hydraulic circuit switching device that switches to an open circuit that is driven by the pressure of the cross-sectional area of the piston of the hydraulic cylinder when the cross-sectional area of the slab exceeds a predetermined value.

請求項１記載の油圧シャーにおいて、小容量で高圧の油圧ポンプは大推力を発生するが速度が遅いので、通常、シングルロッド複動型の油圧シリンダとオープン回路で接続して大鋳片の切断に使用されているが、小容量で高圧の油圧ポンプとシングルロッド複動型の油圧シリンダとを差動回路で接続することにより、油圧シリンダを高速で作動させて切断速度を速くし、小鋳片切断用の大容量で低圧の油圧ポンプと同様に作動させる。ここで、油圧回路を差動回路又はオープン回路に切り替える鋳片の断面積の所定値とは、差動回路における推力によって切断可能な鋳片サイズの最大値以下の値である。この推力によって鋳片を切断できない場合には、油圧回路をオープン回路として、より大きな推力によって鋳片を切断する。 2. The hydraulic shear according to claim 1, wherein a small-capacity and high-pressure hydraulic pump generates a large thrust but is slow in speed. However, by connecting a small-capacity, high-pressure hydraulic pump and a single-rod double-acting hydraulic cylinder with a differential circuit, the hydraulic cylinder is operated at high speed to increase the cutting speed, It operates in the same way as a large-capacity, low-pressure hydraulic pump for single cutting. Here, the predetermined value of the cross-sectional area of the slab that switches the hydraulic circuit to the differential circuit or the open circuit is a value equal to or less than the maximum value of the slab size that can be cut by thrust in the differential circuit. When the slab cannot be cut by this thrust, the slab is cut by a larger thrust using the hydraulic circuit as an open circuit.

前記目的に沿う請求項２記載の鋳片の切断方法は、断面積が異なる鋳片を、小容量で高圧の油圧ポンプを用い、油圧シリンダによって駆動されるシャーによって切断する方法であって、
前記油圧シリンダにシングルロッド複動型の油圧シリンダを用い、
前記鋳片の断面積が所定値以下の場合には、前記油圧シリンダを該油圧シリンダのロッドの断面積によって駆動する差動回路とし、
前記鋳片の断面積が所定値を超える場合には、前記油圧シリンダのピストンの断面積の圧力によって駆動するオープン回路とする。 The method for cutting a slab according to claim 2, which meets the object, is a method of cutting slabs having different cross-sectional areas with a shear driven by a hydraulic cylinder using a small-capacity, high-pressure hydraulic pump,
Use a single rod double-acting hydraulic cylinder for the hydraulic cylinder,
When the cross-sectional area of the slab is a predetermined value or less, the hydraulic cylinder is a differential circuit that is driven by the cross-sectional area of the rod of the hydraulic cylinder,
When the cross-sectional area of the slab exceeds a predetermined value, the open circuit is driven by the pressure of the cross-sectional area of the piston of the hydraulic cylinder.

請求項１記載の鋳片切断用の油圧シャー及び請求項２記載の鋳片の切断方法は、小容量で高圧の油圧ポンプのみを使用するので、設置面積が小さくなり、電力、作動油等のコストも少なくなる。また、油圧ポンプとシングルロッド複動型の油圧シリンダとを繋ぐ配管を差動回路及びオープン回路に切り替えるので、切断する鋳片サイズに対応した切断速度及び推力を得ることができる。更に、切断する鋳片の断面積が所定値以下の場合には差動回路に切り替えるので、小容量で高圧の油圧ポンプの切断速度を速くすることができる。 The hydraulic shear for cutting a slab according to claim 1 and the method for cutting a slab according to claim 2 use only a small-capacity, high-pressure hydraulic pump. Cost is also reduced. In addition, since the pipe connecting the hydraulic pump and the single rod double acting hydraulic cylinder is switched to the differential circuit and the open circuit, the cutting speed and thrust corresponding to the size of the slab to be cut can be obtained. Further, when the cross-sectional area of the slab to be cut is less than or equal to a predetermined value, the differential circuit is switched, so that the cutting speed of the small capacity and high pressure hydraulic pump can be increased.

続いて、添付した図面を参照しつつ、本発明を具体化した実施の形態につき説明し、本発明の理解に供する。
ここで、図１は本発明の一実施の形態に係る鋳片切断用の油圧シャーの油圧回路の説明図である。 Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
Here, FIG. 1 is an explanatory diagram of a hydraulic circuit of a hydraulic shear for cutting a slab according to an embodiment of the present invention.

図１を参照して、本発明の一実施の形態に係る鋳片切断用の油圧シャー１０について説明する。
油圧シャー１０は、図示しない連続鋳造設備で製造される鋳片１１を切断する油圧駆動の鋳片切断装置である。油圧シャー１０は、その油圧回路内に作動油を供給する小容量で高圧の油圧ポンプ（以下、単に油圧ポンプという）１２と、油圧ポンプ１２から供給される作動油によって作動し、鋳片１１の切断用の移動刃１３を駆動するシングルロッド複動型の油圧シリンダ１４とを有している。油圧ポンプ１２及び油圧シリンダ１４は、鋳片１１の断面積に合わせて、差動回路又はオープン回路に切替可能に接続されている。 A hydraulic shear 10 for cutting a slab according to an embodiment of the present invention will be described with reference to FIG.
The hydraulic shear 10 is a hydraulically driven slab cutting device that cuts a slab 11 manufactured by a continuous casting facility (not shown). The hydraulic shear 10 is operated by a small-capacity, high-pressure hydraulic pump (hereinafter simply referred to as a hydraulic pump) 12 that supplies hydraulic oil in its hydraulic circuit, and hydraulic oil supplied from the hydraulic pump 12. And a single rod double-acting hydraulic cylinder 14 for driving the cutting blade 13 for cutting. The hydraulic pump 12 and the hydraulic cylinder 14 are connected to a differential circuit or an open circuit in a switchable manner in accordance with the cross-sectional area of the slab 11.

油圧シリンダ１４には、ヘッド側に第１の出入口１７が、ロッド側に第２の出入口１８が設けられ、第１及び第２の出入口１７、１８を介して、作動油の油圧シリンダ１４内への供給及び排出を行っている。また、ロッド１６の先端には移動刃１３が取付けられ、移動刃１３と隙間を設けて鋳片１１の切断用の固定刃１９が配置されている。 The hydraulic cylinder 14 is provided with a first inlet / outlet 17 on the head side and a second inlet / outlet 18 on the rod side, and the hydraulic oil enters the hydraulic cylinder 14 via the first and second inlets 17 and 18. Supply and discharge. A movable blade 13 is attached to the tip of the rod 16, and a fixed blade 19 for cutting the slab 11 is disposed with a gap from the movable blade 13.

油圧ポンプ１２には、パイロット圧で作動する第１の開閉弁２０を介して、油圧シリンダ１４の第１の出入口１７と繋ぐ配管Ａが接続されている。また、油圧シリンダ１４の第２の出入口１８には、パイロット圧で作動する第２の開閉弁２１を介して、配管Ａに接続される配管Ｂが取付けられている。 A pipe A connected to the first inlet / outlet 17 of the hydraulic cylinder 14 is connected to the hydraulic pump 12 via a first on-off valve 20 that operates with pilot pressure. Further, a pipe B connected to the pipe A is attached to the second inlet / outlet 18 of the hydraulic cylinder 14 via a second on-off valve 21 that operates with a pilot pressure.

また、油圧シャー１０は、油圧回路内の圧力を設定する減圧弁２２、上流側から下流側へと作動油を流すチェック弁（逆止め弁）２３、及びパイロット圧で作動する第３の開閉弁２４が設けられた配管Ｃを有し、配管Ｃの両端はそれぞれ配管Ａ及び配管Ｂに接続されている。配管Ｃには配管Ｄが接続され、配管Ｄの他端には油圧回路内の作動油を貯留及び排出するアキュムレータ２５が設けられている。 The hydraulic shear 10 includes a pressure reducing valve 22 that sets the pressure in the hydraulic circuit, a check valve (check valve) 23 that flows hydraulic oil from the upstream side to the downstream side, and a third on-off valve that operates with pilot pressure. The pipe C is provided with 24, and both ends of the pipe C are connected to the pipe A and the pipe B, respectively. A pipe D is connected to the pipe C, and the other end of the pipe D is provided with an accumulator 25 that stores and discharges hydraulic oil in the hydraulic circuit.

更に、油圧シャー１０は、油圧回路から排出される作動油を貯留するタンク２６を有している。タンク２６はパイロット圧で作動する第４の開閉弁２７を介してタンクバック用の配管Ｅと接続され、配管Ｅの他端は配管Ａの第１の開閉弁２０と油圧シリンダ１４との間に接続されている。また、油圧シャー１０は、移動刃１３の上昇のための油圧回路内の圧力の最大値を設定するリリーフ弁２８を有するタンクバック用の配管Ｆを有し、配管Ｆの両端はそれぞれ配管Ｃ及び配管Ｅに接続されている。 Furthermore, the hydraulic shear 10 has a tank 26 for storing hydraulic oil discharged from the hydraulic circuit. The tank 26 is connected to a tank back pipe E via a fourth on-off valve 27 that operates with a pilot pressure, and the other end of the pipe E is between the first on-off valve 20 of the pipe A and the hydraulic cylinder 14. It is connected. The hydraulic shear 10 has a tank back pipe F having a relief valve 28 for setting the maximum value of the pressure in the hydraulic circuit for raising the movable blade 13, and both ends of the pipe F are connected to the pipe C and It is connected to the pipe E.

ここで、第１〜第４の開閉弁２０、２１、２４、２７をパイロット圧によって作動させる油圧回路について説明する。
第１の開閉弁２０は、第１の開閉弁２０を駆動させるパイロット圧を発生する電磁弁２９を介して、パイロット用の配管Ｇで配管Ａと接続されている。また、電磁弁２９には、更に配管Ｆと接続されるタンクバック用の配管Ｈが接続されている。電磁弁２９のオン時には第１の開閉弁２０と配管Ｆとが接続され、オフ時には第１の開閉弁２０と配管Ａとが接続される。 Here, a hydraulic circuit that operates the first to fourth on-off valves 20, 21, 24, and 27 with pilot pressure will be described.
The first on-off valve 20 is connected to the pipe A by a pilot pipe G through an electromagnetic valve 29 that generates a pilot pressure that drives the first on-off valve 20. The solenoid valve 29 is further connected to a tank back pipe H connected to the pipe F. When the electromagnetic valve 29 is on, the first on-off valve 20 and the pipe F are connected, and when the electromagnetic valve 29 is off, the first on-off valve 20 and the pipe A are connected.

第２の開閉弁２１は、第２の開閉弁２１を駆動させるパイロット圧を発生する電磁弁３０、３１を介して、パイロット用の配管Ｉで配管Ａと接続されている。また、電磁弁３０には、更に配管Ｆと接続されるタンクバック用の配管Ｊが接続されている。また、電磁弁３１には３方コック弁３２を介して、配管Ａと接続されるパイロット用の配管Ｋが接続されている。更に、３方コック弁３２には配管Ｂと接続されるパイロット用の配管Ｌが接続されている。なお、３方コック弁３２は、配管Ａから供給される作動油をパイロット用の配管Ｋを介して第２の開閉弁２１方向へ、配管Ｂから供給される作動油を配管Ｌから第２の開閉弁２１方向へと流すようになっている。 The second on-off valve 21 is connected to the pipe A by a pilot pipe I through electromagnetic valves 30 and 31 that generate a pilot pressure that drives the second on-off valve 21. The solenoid valve 30 is further connected to a tank back pipe J connected to the pipe F. A pilot pipe K connected to the pipe A is connected to the solenoid valve 31 via a three-way cock valve 32. Further, a pilot pipe L connected to the pipe B is connected to the three-way cock valve 32. The three-way cock valve 32 supplies the hydraulic oil supplied from the pipe A to the second on-off valve 21 via the pilot pipe K, and supplies the hydraulic oil supplied from the pipe B to the second on-off valve 21. It is made to flow in the direction of the on-off valve 21.

ここで、電磁弁３０のオン時には電磁弁３１と配管Ｆとが接続され、オフ時には電磁弁３１と配管Ａとが接続される。また、電磁弁３１のオン時には第２の開閉弁２１と電磁弁３０とが接続され、オフ時には第２の開閉弁２１と３方コック弁３２とが接続される。 Here, when the solenoid valve 30 is on, the solenoid valve 31 and the pipe F are connected, and when the solenoid valve 30 is off, the solenoid valve 31 and the pipe A are connected. Further, when the electromagnetic valve 31 is on, the second on-off valve 21 and the electromagnetic valve 30 are connected, and when off, the second on-off valve 21 and the three-way cock valve 32 are connected.

第３の開閉弁２４は、第３の開閉弁２４を駆動させるパイロット圧を発生する電磁弁３３を介して、パイロット用の配管Ｍで配管Ｂと接続されている。また、電磁弁３３には、更に配管Ｆと接続されるタンクバック用の配管Ｎが接続されている。電磁弁３３のオン時には第３の開閉弁２４と配管Ｆとが接続され、オフ時には第３の開閉弁２４と配管Ｂとが接続される。 The third on-off valve 24 is connected to the pipe B by a pilot pipe M through an electromagnetic valve 33 that generates a pilot pressure that drives the third on-off valve 24. In addition, a tank back pipe N connected to the pipe F is further connected to the electromagnetic valve 33. When the electromagnetic valve 33 is on, the third on-off valve 24 and the pipe F are connected, and when the electromagnetic valve 33 is off, the third on-off valve 24 and the pipe B are connected.

第４の開閉弁２７は、第４の開閉弁２７を駆動させるパイロット圧を発生する電磁弁３４が設けられたパイロット用の配管Ｏが取付けられ、配管Ｏの他端は、配管Ａと電磁弁２９との間から分岐して設けられている配管Ｇに接続されている。また、電磁弁３４には、更に配管Ｆと接続されるタンクバック用の配管Ｐが接続されている。電磁弁３４のオン時には第４の開閉弁２７と配管Ａとが接続され、オフ時には第４の開閉弁３４と配管Ｆとが接続される。 The fourth on-off valve 27 is provided with a pilot pipe O provided with an electromagnetic valve 34 for generating a pilot pressure for driving the fourth on-off valve 27. The other end of the pipe O is connected to the pipe A and the electromagnetic valve. 29 is connected to a pipe G that is branched from the space 29. Further, a tank back pipe P connected to the pipe F is further connected to the electromagnetic valve 34. When the solenoid valve 34 is on, the fourth on-off valve 27 and the pipe A are connected, and when the solenoid valve 34 is off, the fourth on-off valve 34 and the pipe F are connected.

ここで、油圧シャー１０の油圧回路切替装置は、第１〜第４の開閉弁２０、２１、２４、２７及び電磁弁２９〜３１、３３、３４によって構成されている。また、第１の開閉弁２０と電磁弁２９との間、第２の開閉弁２１と電磁弁３１との間、第３の開閉弁２４と電磁弁３３との間、及び第４の開閉弁２７と電磁弁３４との間にはそれぞれの開閉弁の開閉速度を調整する図示しない流量調整弁が設けられている。 Here, the hydraulic circuit switching device of the hydraulic shear 10 includes first to fourth on-off valves 20, 21, 24, 27 and electromagnetic valves 29-31, 33, 34. Also, between the first on-off valve 20 and the electromagnetic valve 29, between the second on-off valve 21 and the electromagnetic valve 31, between the third on-off valve 24 and the electromagnetic valve 33, and the fourth on-off valve. Between the valve 27 and the solenoid valve 34, a flow rate adjusting valve (not shown) for adjusting the opening / closing speed of each opening / closing valve is provided.

次に、本発明の一実施の形態に係る油圧シャー１０による鋳片の切断方法について説明する。
油圧シャー１０では、油圧シリンダ１４のピストン１５をヘッド側からロッド側へと押し出して、移動刃１３と固定刃１９とで鋳片１１を切断する。また、油圧シリンダ１４のピストン１５をヘッド側へ引き込んで移動刃１３と固定刃１９との隙間を作り、鋳片１１をその隙間に搬送する。 Next, a method for cutting a slab by the hydraulic shear 10 according to an embodiment of the present invention will be described.
In the hydraulic shear 10, the piston 15 of the hydraulic cylinder 14 is pushed out from the head side to the rod side, and the cast piece 11 is cut by the moving blade 13 and the fixed blade 19. Further, the piston 15 of the hydraulic cylinder 14 is pulled to the head side to create a gap between the movable blade 13 and the fixed blade 19, and the slab 11 is conveyed into the gap.

（小鋳片用の油圧回路について）
油圧シャー１０において小鋳片を切断するには、電磁弁２９をオンにして第１の開閉弁２０を開き、電磁弁３０をオフ、電磁弁３１をオンにして第２の開閉弁２１を閉じ、電磁弁３３をオフにして第３の開閉弁２４を閉じ、電磁弁３４をオンにして第４の開閉弁２７を閉じる。 (Hydraulic circuit for small slabs)
To cut the small slab in the hydraulic shear 10, the electromagnetic valve 29 is turned on, the first on-off valve 20 is opened, the electromagnetic valve 30 is turned off, the electromagnetic valve 31 is turned on, and the second on-off valve 21 is closed. Then, the electromagnetic valve 33 is turned off to close the third on-off valve 24, and the electromagnetic valve 34 is turned on to close the fourth on-off valve 27.

ここで、油圧ポンプ１２から油圧回路に作動油を供給すると、まず、作動油は第１の開閉弁２０を介して油圧シリンダ１４の第１の出入口１７へと供給され、油圧シャー１０のピストン１５を介して移動刃１３が動き出す。同時に、油圧シリンダ１４の第２の出入口１８より作動油は押し出され、ピストン１５のヘッド側とロッド側との受圧面積差（ロッドの断面積）により、開閉弁２１が開き、第２の出入口１８より押し出された作動油が第１の開閉弁２０を介して油圧シリンダ１４のヘッド側へと流れ、第１の出入口１７から油圧シリンダ１４内に供給されて差動回路となり、ピストン１５はロッド側へと急速に押し出され、鋳片１１が移動刃１３及び固定刃１９によって必要な切断速度で切断される。 Here, when hydraulic fluid is supplied from the hydraulic pump 12 to the hydraulic circuit, first, hydraulic fluid is supplied to the first inlet / outlet 17 of the hydraulic cylinder 14 via the first on-off valve 20, and the piston 15 of the hydraulic shear 10. The movable blade 13 starts to move through. At the same time, the hydraulic oil is pushed out from the second inlet / outlet 18 of the hydraulic cylinder 14, and the opening / closing valve 21 is opened by the pressure receiving area difference (rod cross-sectional area) between the head side and the rod side of the piston 15. The hydraulic oil pushed out further flows to the head side of the hydraulic cylinder 14 through the first on-off valve 20 and is supplied into the hydraulic cylinder 14 from the first inlet / outlet 17 to form a differential circuit. The slab 11 is cut at a necessary cutting speed by the moving blade 13 and the fixed blade 19.

次に、押し出されたピストン１５を油圧シリンダ１４のロッド側からヘッド側へと引き込むには、電磁弁２９をオフにして第１の開閉弁２０を閉じる。また、第２の開閉弁２１は、電磁弁３０をオフ、電磁弁３１をオンにすることにより、配管Ｉからのパイロット圧によって閉じる。第１及び第２の開閉弁２０、２１が閉じているので、アキュムレータ２５の圧力によって、第３の開閉弁２４が開き、作動油は油圧シリンダ１４の第２の出入口１８に供給されてピストン１５のロッド側が加圧される。但し、第４の開閉弁２７が閉じているため、移動刃１３は上昇しない。 Next, in order to draw the pushed piston 15 from the rod side of the hydraulic cylinder 14 to the head side, the electromagnetic valve 29 is turned off and the first on-off valve 20 is closed. The second on-off valve 21 is closed by the pilot pressure from the pipe I by turning off the solenoid valve 30 and turning on the solenoid valve 31. Since the first and second on-off valves 20 and 21 are closed, the third on-off valve 24 is opened by the pressure of the accumulator 25, and the hydraulic oil is supplied to the second inlet / outlet 18 of the hydraulic cylinder 14, so that the piston 15 The rod side is pressurized. However, since the fourth on-off valve 27 is closed, the movable blade 13 does not rise.

次に、タイマー制御によって電磁弁３０をオンにして第２の開閉弁２１を開き、また、電磁弁３４をオフにして第４の開閉弁２７を開き、第２の開閉弁２１を介して油圧ポンプ１２から供給される作動油及びアキュムレータ２５から供給される作動油を油圧シリンダ１４の第２の出入口１８に供給してピストン１５をヘッド側へ引き込むと共に、引き込まれたピストン１５によって押し出される作動油を第４の開閉弁２７を介してタンク２６に供給する。 Next, the electromagnetic valve 30 is turned on by the timer control to open the second on-off valve 21, the electromagnetic valve 34 is turned off to open the fourth on-off valve 27, and the hydraulic pressure is passed through the second on-off valve 21. The hydraulic oil supplied from the pump 12 and the hydraulic oil supplied from the accumulator 25 are supplied to the second inlet / outlet 18 of the hydraulic cylinder 14 to draw the piston 15 toward the head, and the hydraulic oil pushed out by the drawn-in piston 15. Is supplied to the tank 26 via the fourth on-off valve 27.

（大鋳片用の油圧回路について）
油圧シャー１０において大鋳片を切断するには、電磁弁２９をオンにして第１の開閉弁２０を開き、電磁弁３０をオフ、電磁弁３１をオフにして第２の開閉弁２１を閉じ、電磁弁３３をオンにして第３の開閉弁２４を開き、電磁弁３４をオンにして第４の開閉弁２７を閉じて、油圧シャー１０の油圧回路をオープン回路に切り替える。 (Hydraulic circuit for large slabs)
To cut the large slab in the hydraulic shear 10, the electromagnetic valve 29 is turned on, the first on-off valve 20 is opened, the electromagnetic valve 30 is turned off, the electromagnetic valve 31 is turned off, and the second on-off valve 21 is closed. Then, the electromagnetic valve 33 is turned on to open the third on-off valve 24, the electromagnetic valve 34 is turned on to close the fourth on-off valve 27, and the hydraulic circuit of the hydraulic shear 10 is switched to an open circuit.

ここで、油圧シャー１０の油圧回路に油圧ポンプ１２から作動油を供給すると、作動油は第１の開閉弁２０を介して油圧シリンダ１４の第１の出入口１７へと供給されてピストン１５をロッド側へ押し出すと共に、ピストン１５（ピストン１５の断面積の圧力）によって押し出された作動油は油圧シリンダ１４の第２の出入口１８から第３の開閉弁２４を介してアキュムレータ２５に供給されて、アキュムレータ２５に蓄積される。 Here, when hydraulic oil is supplied from the hydraulic pump 12 to the hydraulic circuit of the hydraulic shear 10, the hydraulic oil is supplied to the first inlet / outlet 17 of the hydraulic cylinder 14 via the first on-off valve 20 to rod the piston 15. The hydraulic oil pushed out by the piston 15 (pressure of the cross-sectional area of the piston 15) is supplied from the second inlet / outlet 18 of the hydraulic cylinder 14 to the accumulator 25 via the third on-off valve 24, and is then accumulated. 25.

次に、押し出されたピストン１５を油圧シリンダ１４のロッド側からヘッド側へと引き込むには、まず、電磁弁２９をオフにして第１の開閉弁２０を閉じて油圧ポンプ１２から第１の出入口１７への作動油の供給を停止し、アキュムレータ２５から第３の開閉弁２４を介して作動油を油圧シリンダ１４の第２の出入口１８に供給してピストン１５をヘッド側へ徐々に引き込む。次に、タイマー制御によって電磁弁３４をオフにして第４の開閉弁２７を開き、引き込まれたピストン１５によって押し出される作動油を第４の開閉弁２７を介してタンク２６に供給する。 Next, in order to retract the pushed piston 15 from the rod side of the hydraulic cylinder 14 to the head side, first, the electromagnetic valve 29 is turned off, the first on-off valve 20 is closed, and the hydraulic pump 12 is connected to the first inlet / outlet. The supply of the hydraulic oil to 17 is stopped, the hydraulic oil is supplied from the accumulator 25 to the second inlet / outlet 18 of the hydraulic cylinder 14 via the third on-off valve 24, and the piston 15 is gradually drawn to the head side. Next, the solenoid valve 34 is turned off by the timer control to open the fourth on-off valve 27, and the hydraulic oil pushed out by the drawn-in piston 15 is supplied to the tank 26 through the fourth on-off valve 27.

ここで、油圧シリンダ１４の内径をＤ、ピストン１５のロッド１６の径をｄ、油圧ポンプ１２からの作動油の吐出量をＱ、油圧回路の圧力（すなわち、油圧ポンプ１２の吐出圧力）をｐとして、差動回路における推力Ｆs 、ピストンの速度ｖs 、及びオープン回路における推力Ｆo 、ピストンの速度ｖo をそれぞれ求める。推力は圧力を受ける面積とその圧力との積であり、速度は、吐出量を面積で割った商である。 Here, the inner diameter of the hydraulic cylinder 14 is D, the diameter of the rod 16 of the piston 15 is d, the discharge amount of hydraulic oil from the hydraulic pump 12 is Q, and the pressure of the hydraulic circuit (that is, the discharge pressure of the hydraulic pump 12) is p. The thrust F s in the differential circuit, the piston speed v s , the thrust F o in the open circuit, and the piston speed v o are obtained, respectively. Thrust is the product of the pressure receiving area and the pressure, and the speed is a quotient obtained by dividing the discharge amount by the area.

差動回路での推力Ｆs 及びピストンの速度ｖs は、それぞれ（１）式、（２）式で示される。
Ｆs ＝π（Ｄ／２）2 ×ｐ−（π（Ｄ／２）2 −π（ｄ／２）2 ）×ｐ
＝π（ｄ／２）2 ×ｐ＝ａ×ｐ ・・・・・（１）
ｖs ＝Ｑ／（π（Ｄ／２）2 −（π（Ｄ／２）2 −π（ｄ／２）2 ））
＝Ｑ／π（ｄ／２）2 ＝Ｑ／ａ ・・・・・（２）
なお、ａはロッドの断面積である。 The thrust F s and the piston speed v s in the differential circuit are expressed by the equations (1) and (2), respectively.
F s = π (D / 2) 2 × p− (π (D / 2) 2 −π (d / 2) 2 ) × p
= Π (d / 2) 2 × p = a × p (1)
v s = Q / (π (D / 2) 2 − (π (D / 2) 2 −π (d / 2) 2 ))
= Q / π (d / 2) 2 = Q / a (2)
Here, a is the cross-sectional area of the rod.

また、オープン回路での推力Ｆo 及びピストンの速度ｖo は、それぞれ（３）式、（４）式で示される。
Ｆo ＝π（Ｄ／２）2 ×ｐ＝Ａ×ｐ ・・・・・（３）
ｖo ＝Ｑ／（π（Ｄ／２）2 ）＝Ｑ／Ａ ・・・・・（４）
なお、Ａはシリンダの断面積（ピストンの断面積）である。 Further, the thrust F o and the piston velocity v o in the open circuit are expressed by the equations (3) and (4), respectively.
F o = π (D / 2) 2 × p = A × p (3)
v o = Q / (π (D / 2) 2 ) = Q / A (4)
A is the cross-sectional area of the cylinder (the cross-sectional area of the piston).

ここで、（１）式及び（３）式より、油圧シリンダ１４の断面積Ａがロッド１６の断面積ａよりも大きいことから、オープン回路での推力の方が（Ａ／ａ）倍、すなわち、（Ｄ／ｄ）2 倍大きいことがわかる。同様に（２）式及び（４）式より、差動回路での速度の方が（Ａ／ａ）倍、すなわち、（Ｄ／ｄ）2 倍速いことがわかる。したがって、通常ではオープン回路で用いられる速度が遅いが大推力が得られる小容量で高圧の油圧ポンプを備えた油圧シャーにおいて、その油圧経路を差動回路に切り替えることによって、通常では小鋳片の切断に使用される油圧回路の推力は小さいがピストンの速度が速い大容量で定圧の油圧ポンプと同様の性能を発揮できる。 Here, from the equations (1) and (3), since the cross-sectional area A of the hydraulic cylinder 14 is larger than the cross-sectional area a of the rod 16, the thrust in the open circuit is (A / a) times, that is, , (D / d) 2 times larger. Similarly, from the equations (2) and (4), it can be seen that the speed in the differential circuit is (A / a) times, that is, (D / d) 2 times faster. Therefore, in a hydraulic shear equipped with a small-capacity, high-pressure hydraulic pump that normally obtains a large thrust, although the speed used in an open circuit is slow, switching the hydraulic path to a differential circuit usually allows Although the thrust of the hydraulic circuit used for cutting is small, the performance of a large-capacity, constant-pressure hydraulic pump with a fast piston speed can be demonstrated.

ここで、油圧シャー１０において、その油圧回路を差動回路又はオープン回路に切り替える鋳片の断面積の所定値とは、差動回路における推力Ｆs によって切断可能な鋳片サイズの最大値以下の値である。推力Ｆs によって鋳片を切断できない場合には、油圧回路をオープン回路として、より大きな推力Ｆo によって鋳片を切断する。 Here, in the hydraulic shear 10, the predetermined value of the cross-sectional area of the slab that switches the hydraulic circuit to the differential circuit or the open circuit is equal to or less than the maximum value of the slab size that can be cut by the thrust F s in the differential circuit. Value. When the slab cannot be cut by the thrust F s , the slab is cut by the larger thrust F o using the hydraulic circuit as an open circuit.

本発明は、前記した実施の形態に限定されるものではなく、本発明の要旨を変更しない範囲での変更は可能であり、例えば、前記した実施の形態や変形例の一部又は全部を組み合わせて本発明の油圧シャー及びその制御方法を構成する場合も本発明の権利範囲に含まれる。
例えば、前記実施の形態の油圧シャーにおいて、４つの開閉弁、それらを駆動させる５つの電磁弁を用いて差動回路又はオープン回路に切り替え可能な油圧回路としたが、開閉弁、電磁弁の数及び配置はこれに限定されない。また、油圧シャーの油圧回路に方向制御弁、圧力制御弁、及び流量制御弁等のバルブ、圧力計、流量計等を設けてもよい。 The present invention is not limited to the above-described embodiment, and can be changed without changing the gist of the present invention. For example, a part or all of the above-described embodiment and modification examples are combined. Thus, the hydraulic shear and the control method of the present invention are also included in the scope of the right of the present invention.
For example, in the hydraulic shear of the above embodiment, the hydraulic circuit can be switched to a differential circuit or an open circuit by using four on-off valves and five electromagnetic valves for driving them. And the arrangement is not limited to this. In addition, a directional control valve, a pressure control valve, and a flow control valve, a pressure gauge, a flow meter, and the like may be provided in the hydraulic circuit of the hydraulic shear.

本発明の一実施の形態に係る鋳片切断用の油圧シャーの油圧回路の説明図である。It is explanatory drawing of the hydraulic circuit of the hydraulic shear for slab cutting which concerns on one embodiment of this invention. 従来例に係る油圧回路の説明図である。It is explanatory drawing of the hydraulic circuit which concerns on a prior art example. 他の従来例に係る油圧回路の説明図である。It is explanatory drawing of the hydraulic circuit which concerns on another prior art example.

符号の説明Explanation of symbols

１０：油圧シャー、１１：鋳片、１２：油圧ポンプ、１３：移動刃、１４：油圧シリンダ、１５：ピストン、１６：ロッド、１７：第１の出入口、１８：第２の出入口、１９：固定刃、２０：第１の開閉弁、２１：第２の開閉弁、２２：減圧弁、２３：チェック弁、２４：第３の開閉弁、２５：アキュムレータ、２６：タンク、２７：第４の開閉弁、２８：リリーフ弁、２９〜３１：電磁弁、３２：３方コック弁、３３、３４：電磁弁 10: Hydraulic shear, 11: Slab, 12: Hydraulic pump, 13: Moving blade, 14: Hydraulic cylinder, 15: Piston, 16: Rod, 17: First inlet / outlet, 18: Second inlet / outlet, 19: Fixed Blade: 20: first on-off valve, 21: second on-off valve, 22: pressure reducing valve, 23: check valve, 24: third on-off valve, 25: accumulator, 26: tank, 27: fourth on-off Valve, 28: relief valve, 29-31: solenoid valve, 32: three-way cock valve, 33, 34: solenoid valve

Claims (2)

連続鋳造設備で製造される鋳片を切断する油圧シャーにおいて、
油圧回路に作動油を供給する小容量で高圧の油圧ポンプと、
前記油圧ポンプから供給される前記作動油によって作動し、前記鋳片の切断用の移動刃を駆動するシングルロッド複動型の油圧シリンダと、
前記油圧ポンプと前記油圧シリンダとを繋ぐ配管を、前記鋳片の断面積が所定値以下の場合には前記油圧シリンダのロッドの断面積によって駆動する差動回路に、前記鋳片の断面積が所定値を超える場合には前記油圧シリンダのピストンの断面積の圧力によって駆動するオープン回路に、それぞれ切り替える油圧回路切替装置とを有することを特徴とする鋳片切断用の油圧シャー。 In hydraulic shears that cut slabs manufactured in continuous casting equipment,
A small-capacity, high-pressure hydraulic pump that supplies hydraulic fluid to the hydraulic circuit;
A single-rod double-acting hydraulic cylinder that operates by the hydraulic oil supplied from the hydraulic pump and drives a moving blade for cutting the slab;
When the cross-sectional area of the slab is equal to or less than a predetermined value, a pipe connecting the hydraulic pump and the hydraulic cylinder has a cross-sectional area of the slab that is driven by a cross-sectional area of the rod of the hydraulic cylinder. A hydraulic shear for cutting a slab, comprising: a hydraulic circuit switching device that switches to an open circuit that is driven by the pressure of the cross-sectional area of the piston of the hydraulic cylinder when exceeding a predetermined value. 断面積が異なる鋳片を、小容量で高圧の油圧ポンプを用い、油圧シリンダによって駆動されるシャーによって切断する方法であって、
前記油圧シリンダにシングルロッド複動型の油圧シリンダを用い、
前記鋳片の断面積が所定値以下の場合には、前記油圧シリンダを該油圧シリンダのロッドの断面積によって駆動する差動回路とし、
前記鋳片の断面積が所定値を超える場合には、前記油圧シリンダのピストンの断面積の圧力によって駆動するオープン回路とすることを特徴とする油圧シャーによる鋳片の切断方法。 A method of cutting slabs having different cross-sectional areas by a shear driven by a hydraulic cylinder using a small-capacity, high-pressure hydraulic pump,
Use a single rod double-acting hydraulic cylinder for the hydraulic cylinder,
If the cross-sectional area of the slab is less than a predetermined value, the hydraulic cylinder is a differential circuit that is driven by the cross-sectional area of the rod of the hydraulic cylinder,
When the cross-sectional area of the slab exceeds a predetermined value, an open circuit that is driven by the pressure of the cross-sectional area of the piston of the hydraulic cylinder is used.
JP2004067499A 2004-03-10 2004-03-10 Hydraulic shear for cutting cast slab, and method for cutting cast slab Ceased JP2005254267A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015520028A (en) * 2012-05-10 2015-07-16 エスエムエス メア ゲーエムベーハー Hydraulic extruder and method of operating a hydraulic extruder
KR20190008375A (en) * 2016-05-25 2019-01-23 하이닥 시스템스 ＆ 서비시스 게엠베하 Valve device

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Publication number Priority date Publication date Assignee Title
JPH04105204U (en) * 1991-02-16 1992-09-10 石塚硝子株式会社 Hydraulic system for press cylinder
JPH0563725U (en) * 1992-02-06 1993-08-24 富士車輌株式会社 Scrap cutting equipment
JPH07167109A (en) * 1993-10-20 1995-07-04 Kobe Steel Ltd Hydraulic control valve and hydraulic cylinder circuit
JP2596837Y2 (en) * 1992-08-24 1999-06-21 三菱重工業株式会社 Slab cutting equipment for continuous casting equipment

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04105204U (en) * 1991-02-16 1992-09-10 石塚硝子株式会社 Hydraulic system for press cylinder
JPH0563725U (en) * 1992-02-06 1993-08-24 富士車輌株式会社 Scrap cutting equipment
JP2596837Y2 (en) * 1992-08-24 1999-06-21 三菱重工業株式会社 Slab cutting equipment for continuous casting equipment
JPH07167109A (en) * 1993-10-20 1995-07-04 Kobe Steel Ltd Hydraulic control valve and hydraulic cylinder circuit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015520028A (en) * 2012-05-10 2015-07-16 エスエムエス メア ゲーエムベーハー Hydraulic extruder and method of operating a hydraulic extruder
KR20190008375A (en) * 2016-05-25 2019-01-23 하이닥 시스템스 ＆ 서비시스 게엠베하 Valve device
JP2019523847A (en) * 2016-05-25 2019-08-29 ハイダック システムズ アンド サービシズ ゲゼルシャフト ミット ベシュレンクテル ハフツング Valve device
KR102257416B1 (en) 2016-05-25 2021-06-01 하이닥 시스템스 ＆ 서비시스 게엠베하 valve device

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