EP0959202A1 - Broyeur - Google Patents

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Publication number
EP0959202A1
EP0959202A1 EP98109026A EP98109026A EP0959202A1 EP 0959202 A1 EP0959202 A1 EP 0959202A1 EP 98109026 A EP98109026 A EP 98109026A EP 98109026 A EP98109026 A EP 98109026A EP 0959202 A1 EP0959202 A1 EP 0959202A1
Authority
EP
European Patent Office
Prior art keywords
permanent magnet
hydraulic cylinder
crusher
magnet assembly
frame
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98109026A
Other languages
German (de)
English (en)
Other versions
EP0959202B1 (fr
Inventor
Takashi Okumura
Hiroshi Okada
Yoshifumi Itoh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Pneumatic Manufacturing Co Ltd
Original Assignee
Nippon Pneumatic Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Pneumatic Manufacturing Co Ltd filed Critical Nippon Pneumatic Manufacturing Co Ltd
Priority to DE69806342T priority Critical patent/DE69806342T2/de
Priority to ES98109026T priority patent/ES2179399T3/es
Priority to EP98109026A priority patent/EP0959202B1/fr
Publication of EP0959202A1 publication Critical patent/EP0959202A1/fr
Application granted granted Critical
Publication of EP0959202B1 publication Critical patent/EP0959202B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/96—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements
    • E02F3/965—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of metal-cutting or concrete-crushing implements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/08—Wrecking of buildings
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/08—Wrecking of buildings
    • E04G23/082—Wrecking of buildings using shears, breakers, jaws and the like

Definitions

  • This invention relates to a crusher used to dismantle buildings and other structures.
  • a crusher is mounted on an arm tip of a civil engineering machine such as a backhoe to dismantle buildings.
  • the crusher has a fixed jaw secured to the crusher main frame, and a movable jaw provided pivotally opposite the fixed jaw.
  • the movable jaw is opened and closed by a hydraulic cylinder to dismantle a building and break dismantled material into smaller pieces in cooperation with the fixed jaw.
  • Cutting blades provided on the fixed and movable jaws cut iron material, such as iron bars, exposed from the building being dismantled.
  • Iron material thus cut is recovered from the dismantled wastes. Manually recovering such iron material is extremely troublesome and also dangerous because the dismantled remains of a building may collapse.
  • crushers disclosed in unexamined Japanese patent publications 8-13815 and 4-155068 have a permanent magnet mounted in the main body having the fixed jaw to recover iron material from among dismantled remains by magnetically attracting such iron material with the permanent magnet.
  • a permanent magnet is slid in a composite frame comprising a nonmagnetic frame and a magnetic frame.
  • iron material is attracted, and the attraction force is released by sliding the permanent magnet into the magnetic frame.
  • a force greater than the attraction force applied to the magnetic frame has to be applied to the permanent magnet.
  • a large load is applied to a link mechanism for converting the opening/closing movement of the movable jaw into sliding motion of the permanent magnet. The link mechanism thus tends to become shaky soon and its life is short.
  • the composite frame is provided in a relatively small space in the crusher body. Only the bottom of the nonmagnetic frame of the composite frame is used as the surface for attracting iron material. Thus, the attracting surface area is thus small, so that it is impossible to recover iron material with high efficiency.
  • a permanent magnet is slidably mounted in a nonmagnetic casing to define front and rear chambers in the casing.
  • Pressure oil is alternately supplied into one of the chambers to move the permanent magnet.
  • the permanent magnet which corresponds to a piston of a hydraulic cylinder, tends to be influenced by water contained in pressure oil.
  • An object of this invention is to provide a crusher with a permanent magnet which is simple in structure and inexpensive.
  • a crusher comprising a frame having a pair of side plates, a fixed jaw fixed to the frame, a movable jaw pivotally supported on the frame at a position opposite the fixed jaw, a first hydraulic cylinder for opening and closing the movable jaw relative to the fixed jaw, a magnet case mounted between the pair of side plates of the frame, a permanent magnet assembly slidably mounted in the magnet case, and a second hydraulic cylinder connected to the permanent magnet assembly for sliding the permanent magnet assembly, the first and second hydraulic cylinders being operatively associated with each other.
  • on-off valves are provided in an oil feed line communicating with the front chamber of the second hydraulic cylinder and in an oil feed line communicating with the rear chamber of the second hydraulic cylinder.
  • pressurized oil can be sealed in the front or rear chamber of the hydraulic cylinder.
  • the permanent magnet can be moved only when collecting the iron bars and can be held in an inoperative position when breaking the dismantled material and cutting the iron bars.
  • a throttle is provided between one of the on-off valves and the front chamber of the second hydraulic cylinder, and a check valve is provided in a bypass line having one end thereof communicating with the inlet end of the throttle and the other end with the outlet end of the throttle. This prevents oil in the front chamber of the second hydraulic cylinder from flowing through the bypass line. This assures that the permanent magnet moves quickly away from the bottom plate of the magnet case and moves slowly toward the bottom plate.
  • a main frame 10 has a pair of side plates 11 each formed with a pair of pin holes 12, 13 at the upper portion thereof.
  • the frame 10 is pivotally mounted on the tip of an arm 1 of a civil engineering machine by a pin 14 inserted through the holes 12.
  • a two-joint link 2 has one end thereof coupled to the tip of the arm 1 and the other end to the frame 10 by a pin 15 inserted through the holes 13.
  • a cylinder 3 is coupled to the connecting portion of the joints of the link 2. By activating the cylinder 3, the frame 10 is pivoted about the pin 14.
  • a fixed jaw 16 is provided at one side of the lower portion of the frame 10. Opposite the jaw 16, a movable jaw 17 is pivotally supported on a shaft 18 extending between the pair of side plates 11.
  • the movable jaw 17 is opened and closed relative to the fixed jaw 16 by a hydraulic cylinder 19 provided between the pair of side plates 11.
  • the movable jaw 17 has crushing teeth 20 at its tip.
  • the fixed jaw 16 and the movable jaw 17 carry cutting blades 21, 22, respectively, opposite each other to cut iron members.
  • An open-bottomed housing 23 is provided at the bottom of the frame 10.
  • a hollow magnet case 24 is mounted in the housing 23.
  • the magnet case 24 is made from a nonmagnetizable material, and as shown in Fig. 2A, has a bottom plate 25 fixed by tightening bolts 27 against supports 26 fixed to the inner surface of the housing 23 near its bottom.
  • a permanent magnet assembly 29 is vertically slidably supported between vertical guides 28.
  • the permanent magnet assembly 29 comprises an open-bottomed, box-shaped yoke 30 made from a magnetizable material, and a permanent magnet 31 mounted in the yoke 30.
  • the yoke 30 has at its top a coupling piece 32 coupled to a piston rod 34 of a hydraulic cylinder 33 for sliding the magnet 31.
  • the cylinder 33 is bolted to a top plate 35 of the magnet case 24.
  • Cushioning members 36 are provided on the top plate 35 to absorb shocks when the permanent magnet assembly 29 collides against the top plate 35.
  • Fig. 3 shows a hydraulic circuit.
  • Oil feed lines 37a and 37b are connected to a cylinder front chamber 19a and a cylinder rear chamber 19b of the hydraulic cylinder 19 to open and close the movable jaw 17, respectively.
  • On-off valves 39a and 39b are provided in the lines 38a and 38b, respectively, to selectively supply pressure oil to the hydraulic cylinder 33.
  • the line 38a communicating with the front chamber 33a has a throttle 40 disposed between the on-off valve 39a and the front chamber 33a.
  • the hydraulic circuit further includes a bypass line 41 having one and the other ends thereof communicating with the inlet and outlet ends of the throttle 40, respectively.
  • a check valve 42 is provided in the bypass line 41 to prevent oil in the front chamber 33a from flowing through the bypass line 41 toward the on-off valve 39a.
  • the movable jaw 17 is opened and closed about the shaft 18 by supplying pressure oil to the hydraulic cylinder 19 to dismantle a building with the movable jaw 17 and the fixed jaw 16, and to break dismantled material into smaller pieces and to cut e.g. iron bars.
  • the on-off valves 39a, 39b are open, pressure oil is supplied into the hydraulic cylinder 33.
  • the permanent magnet assembly 29 will thus be unnecessarily moved up and down as the movable jaw 17 is opened and closed.
  • the on-off valves 39a, 39b are closed to keep the permanent magnet assembly 29 at the elevated position under the pressure of oil sealed in the front chamber 33a.
  • the on-off valves 39a, 39b shown in Fig. 3 are opened to lower the permanent magnet assembly 29 by supplying pressure oil to the rear chamber 33b of the hydraulic cylinder 33. Iron material is thus attracted to the bottom surface of the bottom plate 25 of the magnet case 24 by a magnetic flux flowing through the bottom plate 25.
  • the throttle 40 restricts the flow of oil from the front cylinder chamber 33a through the line 38a.
  • the assembly 29 is thus lowered slowly, making it possible for the assembly 29 to soft-land on the bottom plate 25.
  • Iron material attracted to the bottom 25 of the magnet case 24 is moved to a predetermined position e.g. by turning the arm, and pressure oil is supplied to the front chamber 33a of the hydraulic cylinder 33 to raise the permanent magnet assembly 29. This weakens the magnetic force, so that the iron material drops by gravity.
  • the hydraulic cylinder 19 for opening and closing the movable jaw 17 is operatively associated with the hydraulic cylinder 33 so that when the movable jaw 17 is opened, the permanent magnet assembly 29 is raised simultaneously.
  • the oil line may be arranged such that the on-off valve 39a communicates with the rear cylinder chamber 33b and the on-off valve 39b communicates with the front cylinder chamber 33a to raise the permanent magnet assembly 29 when the movable jaw 17 is closed.
  • the lines 38a, 38b branching from the lines 37a, 37b leading to the cylinder for opening and closing the movable jaw are connected to the hydraulic cylinder 33, so that the opening and closing of the movable jaw 17 can be operatively associated with the sliding movement of the permanent magnet assembly 29.
  • the structure is thus simple, and the hydraulic circuit can be constructed easily.
  • the changeover between ordinary operations of dismantling and breakage of material into smaller pieces and iron recovery operations is done easily by opening and closing the on-off valves 39a, 39b provided in the lines 38a, 38b.
  • the mounting position of the magnet case 24 is not limited to the bottom of the frame 10. It may be mounted on the other side, i.e. the side on which the fixed jaw 16 is not formed.
  • the structure is simple. No accurate machining of the magnet case and the permanent magnet assembly is required. The entire crusher can thus be manufactured at a low cost. Since the permanent magnet assembly is slid toward and away from the iron attracting surface, it is possible to provide a larger iron attracting surface compared with an arrangement in which the permanent magnet is slid parallel to the iron attracting surface.
  • the permanent magnet assembly is stopped and held at a slide position, so that during crushing of a building, in which the crushing jaws are opened and closed, it is possible to prevent unnecessary movement of the permanent magnet.
  • the permanent magnet assembly can be moved quickly away from the bottom plate of the magnet case, so that the attraction of iron material can be released instantly. Also, the permanent magnet assembly can be slowly moved toward the bottom plate, so that it is possible to prevent breakage of the bottom plate by colliding with the permanent magnet assembly.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Crushing And Grinding (AREA)
  • Working Measures On Existing Buildindgs (AREA)
EP98109026A 1998-05-18 1998-05-18 Broyeur Expired - Lifetime EP0959202B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE69806342T DE69806342T2 (de) 1998-05-18 1998-05-18 Brecher
ES98109026T ES2179399T3 (es) 1998-05-18 1998-05-18 Trituradora.
EP98109026A EP0959202B1 (fr) 1998-05-18 1998-05-18 Broyeur

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP98109026A EP0959202B1 (fr) 1998-05-18 1998-05-18 Broyeur

Publications (2)

Publication Number Publication Date
EP0959202A1 true EP0959202A1 (fr) 1999-11-24
EP0959202B1 EP0959202B1 (fr) 2002-07-03

Family

ID=8231955

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98109026A Expired - Lifetime EP0959202B1 (fr) 1998-05-18 1998-05-18 Broyeur

Country Status (3)

Country Link
EP (1) EP0959202B1 (fr)
DE (1) DE69806342T2 (fr)
ES (1) ES2179399T3 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04155068A (ja) 1990-10-18 1992-05-28 S T K Shokai:Kk 磁石付破砕機
JPH0813815A (ja) 1994-07-04 1996-01-16 S K Kogyo:Kk 建設機械用アタッチメント
DE19710949A1 (de) * 1996-03-15 1997-10-30 Tamrock Oy Anordnung in einem Hydraulikzylinder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04155068A (ja) 1990-10-18 1992-05-28 S T K Shokai:Kk 磁石付破砕機
JPH0813815A (ja) 1994-07-04 1996-01-16 S K Kogyo:Kk 建設機械用アタッチメント
DE19524226A1 (de) * 1994-07-04 1996-01-18 Maruyama Corp Metallabfall-Beseitungsvorrichtung
DE19710949A1 (de) * 1996-03-15 1997-10-30 Tamrock Oy Anordnung in einem Hydraulikzylinder

Also Published As

Publication number Publication date
DE69806342T2 (de) 2003-03-27
EP0959202B1 (fr) 2002-07-03
DE69806342D1 (de) 2002-08-08
ES2179399T3 (es) 2003-01-16

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