200417426 (1) 玫、發明說明 【發明所屬之技術領域】 此發明，是關於壓機用模具緩衝裝置的油壓系統。 【先前技術】 在這種的油壓系統中，習知，如日本特開平卜 1 9 04 64號公報，在壓機用模具緩衝裝置的緩衝襯墊的上 面將多數的油壓汽缸朝水平方向並列設置，將油槽筒內的 油透過油壓泵往上述複數的油壓汽缸的油壓室供給，其油 壓室的壓油是透過活塞將緩衝銷從下側承受。 上述的習知技術，即使在上述的多數的緩衝銷的長度 尺寸存在參差不齊的情況，在沖床加工時是藉由皺紋按壓 模型透過上述緩衝銷將上述活塞朝油壓室內按壓，來吸收 上述緩衝銷的長度尺寸的參差不齊，其可以將沖床加工時 的緩衝負荷往上述緩衝銷幾乎均等地傳達的效果很優秀。 但是，將上述活塞的緩衝行程設定於所期範圍的部分 還需要改善。 即，往前述的油壓室供給壓油，因爲是本質上非壓縮 性，容許壓縮量是非常小，所以上述活塞的緩衝行程是需 縮小。因此，上述的多數的緩衝銷的長度尺寸的參差不齊 大的情況中，無法吸收其參差不齊。 爲了消解上述的弊害，本發明者，先在上述的多數的 油壓汽缸的油壓室連通通常的彈簧式蓄壓器（或是氣體式 蓄壓器）。但是，在此先前的發明例中，上述活塞的緩衝 -5- (2) 200417426 行程是過大，而其活塞會與前述的油壓室的底壁衝突。 本發明的目的，是將設在壓機用模具緩衝裝置的油壓 系統的多數的油壓汽缸的緩衝行程設定於所期範圍的同 時’將其油壓系統輕小地製造。 【發明內容】200417426 (1) Description of the invention [Technical field to which the invention belongs] This invention relates to an oil pressure system of a mold buffer device for a press. [Prior Art] In such a hydraulic system, it is conventionally known, for example, in Japanese Unexamined Patent Publication No. 1 9 04 64, that a large number of hydraulic cylinders are oriented horizontally on a cushion pad of a die cushioning device for a press. It is arranged in parallel, and the oil in the oil tank cylinder is supplied to the oil pressure chambers of the plurality of oil pressure cylinders through the oil pressure pump, and the oil in the oil pressure chambers receives the buffer pin from the lower side through the piston. The above-mentioned conventional technology absorbs the above-mentioned piston by pressing the piston into the oil pressure chamber through the buffer pin through a wrinkle pressing model during punch processing even if the length and size of most of the buffer pins are uneven. The length and size of the buffer pin are uneven, and the effect that the buffer load during the punching process can be transmitted almost uniformly to the buffer pin is excellent. However, there is still a need to improve the portion where the cushion stroke of the piston is set within a desired range. That is, the supply of hydraulic oil to the aforementioned hydraulic chamber is essentially non-compressible, and the allowable compression amount is very small. Therefore, the buffer stroke of the piston needs to be reduced. Therefore, in the case where there is a large variation in the lengths of the buffer pins, the unevenness cannot be absorbed. In order to eliminate the above-mentioned disadvantages, the present inventors first communicated a normal spring-type accumulator (or a gas-type accumulator) to the hydraulic chambers of most of the hydraulic cylinders described above. However, in this prior invention example, the cushioning of the above-mentioned piston -5- (2) 200417426 stroke is too large, and its piston will collide with the bottom wall of the aforementioned hydraulic chamber. The object of the present invention is to make the hydraulic system of the hydraulic system of the hydraulic system provided in the die cushioning device for a press at the same time as the buffer stroke of the hydraulic cylinder set to a desired range. [Summary of the Invention]
爲了達成上述的目的，本發明，是如第1圖及第2圖 A及第2圖B、或第3、4、5圖的各圖所示，將壓機用模 具緩衝裝置的油壓系統如以下構成。In order to achieve the above-mentioned object, the present invention is a hydraulic system in which a mold buffer device for a press is shown in each of FIGS. 1 and 2A and 2B, or FIGS. 3, 4, and 5 It is structured as follows.
在壓機用模具緩衝裝置的緩衝襯墊1的上面將複數的 長底基板2隔有間隔地設置。分別在的長底基板2將多數 的油壓汽缸3朝上述的長底基板2的長度方向隔有間隔地 設置。將油槽筒2 0內的油透過油壓泵2 1往上述的多數的 油壓汽缸3的油壓室1 〇供給，其油壓室1 〇的壓油是透過 活塞9將緩衝銷1 7從下側在承受。在上述的各油壓室 10，連通貯留壓油的高壓容器41。將其高壓容器41，配 置於相鄰接長的底基板2、2之間。 本發明，可達成以下的作用效果。 藉由將壓油貯留於前述的高壓容器內，使用於模具緩 衝裝置的油壓系統的壓油的總量可以增加，依據其增加量 來增加壓油的容許壓縮量是可能的。因此，藉由將上述的 高壓容器的內容積設定成預定的値來調節上述的壓油的總 量，就可將前述的多數的油壓汽缸的緩衝行程設定於所期 範圍。 -6 - (3) (3)200417426 且，本發明，爲了達成上述的效果，不只將壓油貯留 於高壓容器內，在前述先前發明例的彈簧式蓄壓器（或是 氣體式蓄壓器）因爲可省略必要的可動部分，所以可防止 因密封墊的摩耗等所產生的壓油漏出而可長期間免維修地 使用。 且，因爲將上述的高壓容器配置於相鄰接長底基板之 間，所以不需要供設置其高壓容器用的專用空間將確保， 可提供輕小的油壓系統。 且，本發明是包含下述的油壓系統。 例如，如第4圖或是第5圖所示，將前述的高壓容器 41複數設置，將這些複數的高壓容器41之中的至少一高 壓容器4 1，透過開閉閥5 1，與前述的油壓汽缸3的前述 的油壓室1 〇連通。 依據此發明，藉由將上述的開閉閥由手動或是自動開 閉，就可附加或是削減相當於與其開閉閥連結的高壓容器 的內容積的壓油量。因此，使用於上述的油壓系統的模具 緩衝作用的壓油的量可以容易調節。其結果’對應於前述 模具緩衝裝置的模具緩衝能力的適切的壓油量可容易設 定。 在本發明中，如第4圖，分別將前述的複數的高壓容 器41，透過開閉閥5 1 ’與前述的油壓汽缸3的前述的油 壓室1 0連通較佳。依據此發明，因爲藉由將上述的開閉 閥由手動或是自動開閉’就可分別附加或是削減相當於的 高壓容器的內容積的壓油量’所以使用於前述的油壓系統 -7- (4) 200417426 的模具緩衝作用的壓油的量在將廣範圍地調節。 且，在上述的油壓系統，如第2圖A或是第3圖或 是第4圖所示，將前述高壓容器41，沿著前述的長底基 板2的形成細長形狀較佳。此發明，因爲可將鄰接長底基 板2、2之間的空間有效利用，可兩立：設置大容量的高 壓容器、及將前述的油壓系統輕小地製造。A plurality of long-bottom substrates 2 are provided on the cushion pad 1 of the die cushioning device for a press at intervals. Each of the long-bottom substrates 2 is provided with a plurality of hydraulic cylinders 3 spaced apart in the longitudinal direction of the above-mentioned long-bottom substrate 2. The oil in the oil tank cylinder 20 is supplied through the hydraulic pump 21 to the hydraulic chamber 1 0 of most of the hydraulic cylinders 3 described above, and the hydraulic oil in the hydraulic chamber 10 is transmitted through the piston 9 to the buffer pin 17 The underside is bearing. In each of the hydraulic chambers 10 described above, a high-pressure container 41 for storing hydraulic oil is communicated. The high-pressure container 41 is placed between the base substrates 2 and 2 adjacent to each other. The present invention can achieve the following effects. By storing the pressurized oil in the aforementioned high-pressure container, the total amount of pressurized oil of the hydraulic system used in the mold buffer device can be increased, and it is possible to increase the allowable compression amount of the pressurized oil according to the increase amount. Therefore, by adjusting the internal volume of the high-pressure vessel to a predetermined value, and adjusting the total amount of the hydraulic oil, the buffer stroke of most of the hydraulic cylinders described above can be set within a desired range. -6-(3) (3) 200417426 In order to achieve the above-mentioned effect, the present invention not only stores the pressurized oil in a high-pressure container, but also the spring-type pressure accumulator (or gas-type pressure accumulator) in the foregoing invention example. ) Since the necessary moving parts can be omitted, it is possible to prevent the pressure oil from leaking due to the wear of the gasket, etc., and it can be used without maintenance for a long period of time. Moreover, since the above-mentioned high-pressure container is arranged between the adjacent long-bottom substrates, a dedicated space for installing the high-pressure container is not required, and it is ensured that a light and small hydraulic system can be provided. The present invention includes the following hydraulic system. For example, as shown in FIG. 4 or FIG. 5, a plurality of the high-pressure vessels 41 are provided, and at least one high-pressure vessel 41 among the plurality of high-pressure vessels 41 is passed through the on-off valve 51 and the aforementioned oil. The aforementioned hydraulic chamber 10 of the hydraulic cylinder 3 communicates. According to this invention, by manually opening or closing the on-off valve, it is possible to add or reduce the amount of pressurized oil corresponding to the internal volume of the high-pressure container connected to the on-off valve. Therefore, the amount of the hydraulic oil for the buffering effect of the mold used in the above hydraulic system can be easily adjusted. As a result, an appropriate amount of oil pressure corresponding to the mold buffering capacity of the aforementioned mold buffering device can be easily set. In the present invention, as shown in FIG. 4, it is preferable that the plurality of high-pressure containers 41 are communicated with the hydraulic chamber 10 of the hydraulic cylinder 3 through the on-off valve 5 1 '. According to this invention, the above-mentioned on-off valve is used in the aforementioned hydraulic system because the on-off valve can be opened or closed manually or automatically, so that the corresponding amount of oil pressure in the high-pressure vessel can be added or reduced. (4) 200417426 The amount of hydraulic oil for mold buffering will be adjusted in a wide range. Further, in the above-mentioned hydraulic system, as shown in Fig. 2A or Fig. 3 or Fig. 4, it is preferable that the high-pressure container 41 is formed into an elongated shape along the long base plate 2 described above. In this invention, since the space between the adjacent long bottom substrates 2 and 2 can be effectively used, they can stand in two directions: a large-capacity high-pressure container is installed, and the aforementioned hydraulic system is manufactured lightly.
進一步，對於上述的油壓系統，如第2圖A及第2 圖B，將前述的油槽筒20及前述的油壓泵2 1，配置於相 鄰接的長底基板2、2之間較佳。此發明，因爲不需要確 保供設置上述的油槽筒及油壓泵用的專用空間，所以可將 上述的油壓系統更輕小地製造。 【實施方式】 以下，將本發明的一實施例藉由第1圖及第2圖A 及第2圖B說明。Further, for the above-mentioned hydraulic system, as shown in FIG. 2A and FIG. 2B, the aforementioned oil tank cylinder 20 and the aforementioned hydraulic pump 21 are arranged between the adjacent long-bottom substrates 2 and 2, good. According to this invention, since it is not necessary to secure a dedicated space for installing the above-mentioned oil tank and the hydraulic pump, the above-mentioned hydraulic system can be made lighter and lighter. [Embodiment] An embodiment of the present invention will be described below with reference to Figs. 1 and 2A and 2B.
在壓機的緩衝襯墊1的上面，複數的長底基板2是隔 有預定間隔地被固定。分別在長底基板2設有多數的油壓 汽缸3。這些的油壓汽缸3，是往上述的長底基板2的長 度方向隔有預定間隔地被固定。由此，上述的多數的油壓 汽缸3是平面視呈碁盤格狀配置。然而，未配置上述的油 壓汽缸3處，是將插頭用的凸緣4安裝於上述的長底基板 2的對應處。 上述的油壓汽缸3是如以下結構。 在上述的長底基板2的支撐面2a外殼5是透過封止 (5) (5)200417426 具6及複數的螺絲7呈保密狀固定。在其外殼5的汽缸孔 8使活塞9是呈保密狀插入，在其活塞9及上述的支撐面 2a之間形成有油壓室10。其油壓室是與上述的支撐面 2a直接對面。 且’在上述的長底基板2內，形成有往水平方向延伸 主流路1 3及往上下方向延伸多數的分岐路1 4。前述的油 壓汽缸3的則述油壓室1 〇是經過上述的分岐路1 4與上述 的主流路1 3連通。 前述緩衝襯墊1，是藉由空壓式的皺紋按壓負荷附與 手段（無圖示）朝上方向按壓。且，在上述的多數的油壓 汽缸3的上方配置有皴紋按壓模型（無圖示），在有其|皮 紋按壓模型及前述的多數的活塞9之間配置多數的緩衝銷 1 7。這些的緩衝銷1 7的設置數量，是依據壓機的能力或 型式不同，是每個模具緩衝裝置是數十根至二百根程度。 油槽筒2 0內的油，是藉由作爲油壓泵的空油壓式增 壓泵2 1加壓，從其增壓泵2 1吐出的壓油，是經過壓油路 22往前述的長底基板2內的前述的主流路1 3供給。上述 增壓泵21的吐出壓力，是藉由將氣壓源24的壓縮空氣的 壓力由減壓閥2 5調節至預定的壓力而變更可能。 然而，在上述的增壓泵21中裝設有吸入閥26及吐出 閥2 7。且在前述的壓油路2 2中，裝設有過濾器2 9及止 回閥3 0。從這些過濾器2 9及止回閥3 0之間使安全閥3 1 分岐。 且，由上述的止回閥3 0的下流側從上述的壓油路2 2 -9 - (6) (6)200417426 使壓力保障手段3 3分岐。其壓力保障手段3 3，是由呈直 列連接的節流閥3 4及三位置切換閥3 5組成。其切換閥 3 5，是上述的壓油路22的壓力是比設定壓力領域低時爲 低壓關閉位置X，其壓力是超過上述的設定壓力領域時爲 高壓關閉位置Y，在這些兩位置X · Y的切換途中中與打 開位置Z。然而，參照符號3 7是入口側過濾器，參照符 號3 8是閉止閥。 在上述的切換閥3 5的上述的切換途中，前述的油壓 汽缸3的前述的油壓室1 0內的壓油是通過前述的節流閥 34及上述的打開位置2的切換閥35往前述的油槽筒20 只排出微少量。由此，即使因壓機的運轉上述的油壓室 1 〇內的壓油的溫度是上昇情況，也可防止上述的油壓室 1 〇的壓力異常上昇。 在此實施例中，前述的增壓泵2 1的吐出壓力是約 2.5 MPa，前述安全閥31的安全設定壓力是約7MPa至約 lOMPa，壓機的運轉中的前述的油壓室10的壓油的最高 壓力是約50MPa，前述的壓力保障手段33的前述的設定 壓力領域是約3.5MPa至約5MPa。 進一步，在前述的止回閥3 0的下流側在前述的壓油 路2 2，連通有貯留壓油的長的高壓容器4 1。更詳細的 話，其高壓容器41，是由沿著前述的長底基板2細長形 成的厚層圓筒所構成，在相鄰接的長底基板2、2之間複 數配置（在此只圖示1個高壓容器41)。上述的高壓容 器4 1的長度方向的各端部是透過連結管42往各長底基板 -10- (7) (7)200417426 2的_述的主流路1 3連通。 前述的油槽筒20及前述的增壓泵2 1，也配置相鄰接 的長底基板2、2之間。且，將前述壓力保障手段3 3、止 回閥3 0、安全閥3 1、閉止閥3 8 —體組裝的閥裝置4 3是 被固定於前述的長底基板2。 將上述結構的油壓系統的實驗例顯示於以下。 前述的油壓汽缸3的設置數量是1 6 1根，與油壓汽缸 3的前述的油壓室1 〇的容積的合計及配管路（前述的主 流路13及分岐路14等）的容積的總計，是約6升（約 6000 cm3)。且，本發明的前述的高壓容器41的內容積， 是設定爲約4升（約4000cm3)。 在上述的條件，由緩衝負荷是1 20噸而前述緩衝銷 1 7的使用根數是在20根的情況中，未設置上述的高壓容 器4 1時，上述的油壓汽缸3的前述活塞9的緩衝行程是 約3 mm，對於此，設置了上述的高壓容器4 1時，上述活 塞9的緩衝行程是約5 m m。 上述的實施例是如以下變更可能。 前述的高壓容器41及油槽筒20及增壓泵21及閥裝 置43的高度，如第2B圖所示，成爲前述的油壓汽缸3的 前述活塞9的上端面的高度以下地配置較佳’比其上端面 稍高地配置也可能。 上述的油壓汽缸3，當然不限定被於例示的構造’可 採用各種的構造。 上述的高壓容器4 1，可取代複數設置’而只設置1 -11 - (8) (8)200417426 個也可以。 前述的閥裝置4 3，可取代如固定於長底基板2，而配 置於相鄰接的長底基板2、2之間也可以。 將上述的閥裝置4 3及前述的油槽筒2 0及前述增壓泵 2 1的至少一個配置於前述緩衝襯墊丨的外部也可能。 可取代如將前述的節流閥3 4及前述的切換閥3 5個別 設置，而將其節流閥3 4組裝於上述的切換閥3 5的內部也 可以。 第3圖至第5圖，是分別顯示本發明的第丨變形例至 第3變形例，類似於前述的第2圖A的模式圖。在這些 的變形例，與上述實施例相同功能的構件，原則上附加同 一參照數字。 第3圖的第1變形例是如以下結構。 在其第3圖中的左右的兩側中，在前述的相鄰接長底 基板2、2之間將二本的長的高壓容器4 1呈直列狀設置， 將迨些局壓容器4 1、4 1往目ij述一對的連結管4 2、4 2呈直 列連接。 第4圖的第2變形例是如以下結構。 在前述的相鄰接長底基板2、2之間的各空間在將二 本的長的高壓容器4 1設置成分離的狀態，將各高壓容器 4 1的長度方向的外端部透過開閉閥5 1與前述的連結管4 2 連接。上述的開閉閥51，是藉由電動機或空壓汽缸等的 致動器自動地操作較佳，由手動操作的形式也可以。 第5圖的第3變形例是如以下結構。 -12- (9) (9)200417426 在其第5圖中的左右的兩側，在前述的相鄰接長底基 板2、2之間將三個球形高壓容器4 1透過前述的開閉閥 5 1呈直列狀連接，朝外方位置的高壓容器4 1透過將別的 開閉閥5 1與前述的連結管4 2連接。且，在其第5圖中的 左右方向的中央部分，在相鄰接的長底基板2、2之間的 各空間將二個的球形高壓容器4 1設置成分離的狀態。而 且，在上述的中央部分的左側，將各高壓容器4 1的外端 部透過前述的開閉閥5 1與前述的連結管42連接。對於 此，在上述的中央部分的右側，省略上述的開閉閥5 1， 將各高壓容器4 1的外端部與上述的連結管42直接連接。 前述的實施例或變形例，是進一步如以下變更可能。 前述的開閉閥5 1，是與複數的高壓容器4 1之中的至 少一高壓容器41連接即可。因此，在前述的第4圖的第 2變形例，省略複數的任意的開閉閥5 1也可以。 且，上述的複數的高壓容器4 1的形狀，當然是限定 於例示長形或球形。 【圖式簡單說明】 第1圖，是顯示本發明的一實施例，油壓系統的系統 圖。 第2圖A，是上述的油壓系統的平面圖。 第2圖B，是相當於上述的第2圖A中的2 B-2 B線 視圖的立面圖。 第3圖，是顯示本發明的第1變形例，類似於上述的 -13- (10) 200417426 第2圖A的平面圖的模式圖。 第4圖，是顯示本發明的第 第3圖的模式圖。 第5圖，是顯示本發明的第 第3圖的模式圖。 【符號說明】 X低壓關閉位置 Y高壓關閉位置 Z打開位置 1緩衝襯墊 2長底基板 2a支撐面 3 油壓汽缸 4凸緣 5外殼 6封止具 7螺絲 8汽缸孔 9活塞 1 〇油壓室 1 3主流路 14分岐路 1 7緩衝銷 2變形例，類似於上述的 3變形例，類似於同上的On the cushion pad 1 of the press, a plurality of long-bottom substrates 2 are fixed at predetermined intervals. A plurality of hydraulic cylinders 3 are provided on the long-bottom base plate 2, respectively. These hydraulic cylinders 3 are fixed at predetermined intervals in the longitudinal direction of the long-bottom substrate 2 described above. As a result, most of the hydraulic cylinders 3 described above are arranged in a grid pattern in plan view. However, in the case where the above-mentioned hydraulic cylinder 3 is not provided, the flange 4 for the plug is mounted on the corresponding place of the above-mentioned long bottom substrate 2. The above-mentioned hydraulic cylinder 3 has the following structure. The housing 5 is secured to the support surface 2a of the long-bottom substrate 2 by sealing (5) (5) 200417426 6 and a plurality of screws 7 in a secure manner. A piston 9 is inserted in the cylinder hole 8 of the casing 5 in a secure manner, and a hydraulic chamber 10 is formed between the piston 9 and the above-mentioned support surface 2a. The oil pressure chamber is directly opposite the above-mentioned support surface 2a. Further, in the above-mentioned long bottom substrate 2, a main flow path 13 extending in a horizontal direction and a branch path 14 extending a large number in a vertical direction are formed. The hydraulic chamber 10 of the hydraulic cylinder 3 is in communication with the main flow path 13 described above via the branch path 14. The cushion pad 1 is pressed upward by an air pressure type wrinkle pressing load applying means (not shown). In addition, a ridge pattern (not shown) is disposed above the above-mentioned plurality of hydraulic cylinders 3, and a plurality of cushion pins 17 are disposed between the ridge pattern and the above-mentioned plurality of pistons 9. The number of these buffer pins 17 is set according to the capacity or type of the press, and it is about tens to two hundred for each mold buffer device. The oil in the oil tank cylinder 20 is pressurized by an air-hydraulic booster pump 21 as a hydraulic pump, and the hydraulic oil discharged from the booster pump 21 is extended through the hydraulic oil path 22 to the aforementioned length. The aforementioned main flow path 1 3 in the base substrate 2 is supplied. The discharge pressure of the booster pump 21 can be changed by adjusting the pressure of the compressed air of the air pressure source 24 to a predetermined pressure from the pressure reducing valve 25. However, the aforementioned booster pump 21 is provided with a suction valve 26 and a discharge valve 27. A filter 29 and a check valve 30 are installed in the aforementioned hydraulic circuit 22. The safety valve 31 is divided between these filters 29 and the check valve 30. In addition, the downstream side of the check valve 30 divides the pressure securing means 33 from the pressure passage 2 2 -9-(6) (2004) 4426 described above. The pressure protection means 33 is composed of a throttle valve 34 and a three-position switching valve 35 connected in series. The switching valve 35 is the low-pressure closed position X when the pressure in the hydraulic circuit 22 is lower than the set pressure region, and the high-pressure closed position Y when the pressure exceeds the set pressure region. In these two positions X · Y is switched midway with the open position Z. However, reference numeral 37 is an inlet-side filter, and reference numeral 38 is a shut-off valve. During the above switching of the switching valve 35, the hydraulic pressure in the hydraulic chamber 10 of the hydraulic cylinder 3 is passed through the throttle valve 34 and the switching valve 35 in the open position 2 to The aforementioned oil tank cylinder 20 is discharged only in a small amount. Accordingly, even if the temperature of the hydraulic oil in the hydraulic chamber 10 is increased due to the operation of the press, the abnormal increase in the pressure of the hydraulic chamber 10 can be prevented. In this embodiment, the discharge pressure of the aforementioned booster pump 21 is about 2.5 MPa, the safety setting pressure of the aforementioned safety valve 31 is about 7 MPa to about 10 MPa, and the pressure of the aforementioned oil pressure chamber 10 during the operation of the press is The maximum pressure of the oil is about 50 MPa, and the aforementioned set pressure range of the aforementioned pressure securing means 33 is about 3.5 MPa to about 5 MPa. Further, on the downstream side of the non-return valve 30, a long high-pressure container 41 for storing the hydraulic oil is communicated with the hydraulic oil channel 22 as described above. In more detail, the high-pressure container 41 is formed by a thick-layered cylinder that is elongated along the long-bottom substrate 2 described above, and is arranged in plural between the adjacent long-bottom substrates 2 and 2 (only shown here) 1 high pressure vessel 41). Each of the ends of the high-pressure container 41 in the longitudinal direction is communicated to each of the long-bottom substrates 13 through the connecting tube 42 through the main channel 13 described in (10) (7) (7) 200417426 2. The aforementioned oil tank cylinder 20 and the aforementioned booster pump 21 are also arranged between the long base plates 2 and 2 adjacent to each other. In addition, the valve device 43, which is a body assembled with the pressure securing means 3 3, the check valve 30, the safety valve 31, and the shut-off valve 3 8 is fixed to the long-bottom substrate 2 described above. Experimental examples of the hydraulic system having the above-mentioned configuration are shown below. The number of the aforementioned hydraulic cylinders 3 is 161, and the total of the volume of the aforementioned hydraulic chamber 10 of the hydraulic cylinder 3 and the volume of the piping (the aforementioned main flow path 13 and branch manifold 14 etc.) In total, it is about 6 liters (about 6000 cm3). The internal volume of the high-pressure container 41 of the present invention is set to about 4 liters (about 4000 cm3). Under the above conditions, when the buffer load is 120 tons and the number of buffer pins 17 is 20, when the high-pressure container 41 is not provided, the piston 9 of the hydraulic cylinder 3 is provided. The cushioning stroke of the piston 9 is about 3 mm. For this, when the high-pressure vessel 41 is provided, the cushioning stroke of the piston 9 is about 5 mm. The embodiment described above is possible as follows. As shown in FIG. 2B, the heights of the high-pressure container 41, the oil tank cylinder 20, the booster pump 21, and the valve device 43 are preferably arranged below the height of the upper end surface of the piston 9 of the hydraulic cylinder 3, as shown in FIG. 2B. Arrangement slightly higher than the upper end surface is also possible. Of course, the above-mentioned hydraulic cylinder 3 is not limited to the illustrated structure ', and various structures can be adopted. The above-mentioned high-pressure vessels 41 may be provided in place of the plural number and only 1 -11-(8) (8) 200417426 may be provided. The valve device 4 3 described above may be fixed to the long-base substrate 2 instead of being fixed to the long-base substrates 2 and 2 adjacent to each other. It is also possible to arrange at least one of the above-mentioned valve device 43, the above-mentioned oil tank cylinder 20, and the above-mentioned booster pump 21 outside the buffer pad 丨. Instead of separately providing the aforementioned throttle valve 34 and the aforementioned switching valve 35, the throttle valve 34 may be assembled inside the aforementioned switching valve 35. Figures 3 to 5 are schematic views showing the first to third modified examples of the present invention, respectively, similar to the aforementioned second figure A. In these modified examples, members having the same functions as those of the above-mentioned embodiment are given the same reference numerals in principle. The first modification of FIG. 3 has the following configuration. On the left and right sides in FIG. 3, two long high-pressure vessels 41 are arranged in an in-line manner between the adjacent long-joint base substrates 2 and 2, and some local pressure vessels 41 are placed. , 4 1 A pair of connecting pipes 4 2 and 4 2 described in the head ij are connected in line. The second modification of FIG. 4 has the following configuration. In each of the spaces between the adjacent long bottom substrates 2 and 2, the two long high-pressure vessels 41 are separated, and the outer ends of the high-pressure vessels 41 in the longitudinal direction are transmitted through the on-off valves. 5 1 is connected to the aforementioned connecting pipe 4 2. The above-mentioned on-off valve 51 is preferably operated automatically by an actuator such as a motor or an air cylinder, or may be manually operated. The third modification of FIG. 5 has the following configuration. -12- (9) (9) 200417426 On its left and right sides in FIG. 5, three spherical high-pressure vessels 4 1 are passed between the aforementioned adjacent extended bottom substrates 2 and 2 through the aforementioned on-off valve 5 1 is connected in an in-line manner, and the high-pressure vessel 4 1 facing outwards is connected to another on-off valve 5 1 through the above-mentioned connecting pipe 4 2. In the center portion in the left-right direction in FIG. 5, two spherical high-pressure vessels 41 are provided in a spaced state in each space between the adjacent long bottom substrates 2 and 2. Furthermore, on the left side of the above-mentioned central portion, the outer end portion of each high-pressure vessel 41 is connected to the aforementioned connection pipe 42 through the aforementioned on-off valve 51. In this regard, on the right side of the above-mentioned central portion, the above-mentioned on-off valve 51 is omitted, and the outer end portion of each high-pressure vessel 41 is directly connected to the above-mentioned connecting pipe 42. The above-mentioned embodiment or modification can be further modified as follows. The aforementioned on-off valve 51 may be connected to at least one high-pressure vessel 41 among the plurality of high-pressure vessels 41. Therefore, in the second modification of the aforementioned FIG. 4, the plural optional on-off valves 51 may be omitted. The shape of the plurality of high-pressure vessels 41 described above is, of course, limited to an example of an elongated shape or a spherical shape. [Brief Description of the Drawings] Fig. 1 is a system diagram showing an oil pressure system according to an embodiment of the present invention. FIG. 2A is a plan view of the above-mentioned hydraulic system. Fig. 2B is an elevational view corresponding to the view taken along line 2 B-2 B in Fig. 2A. Fig. 3 is a schematic view showing a first modification of the present invention, similar to the above-mentioned -13- (10) 200417426, the plan view of Fig. 2A. Fig. 4 is a schematic diagram showing Fig. 3 of the present invention. Fig. 5 is a schematic diagram showing Fig. 3 of the present invention. [Symbol description] X low pressure closed position Y high pressure closed position Z open position 1 cushion pad 2 long base plate 2a support surface 3 hydraulic cylinder 4 flange 5 housing 6 seal 7 screw 8 cylinder hole 9 piston 1 〇 hydraulic pressure Room 1 3 main road 14 branch road 1 7 buffer pin 2 modification, similar to the above 3 modification, similar to the same as above
-14- (11)200417426 20油槽筒 2 1增壓泵（油壓泵） 22壓油路 24氣壓源 25減壓閥-14- (11) 200417426 20 Oil tank cylinder 2 1 Booster pump (hydraulic pump) 22 Pressure oil circuit 24 Air pressure source 25 Pressure reducing valve
2 6吸入閥 27吐出閥 29過濾器 3 0 止回閥 3 1安全閥 3 3壓力保障手段 3 4節流閥 3 5切換閥 3 7入口側過濾器 3 8 閉止閥 41高壓容器 42連結管 43閥裝置 5 1開閉閥 -15-2 6 Suction valve 27 Discharge valve 29 Filter 3 0 Check valve 3 1 Safety valve 3 3 Pressure assurance means 3 4 Throttle valve 3 5 Switching valve 3 7 Inlet-side filter 3 8 Shut-off valve 41 High-pressure container 42 Connecting pipe 43 Valve device 5 1 On-off valve -15-