EP0486871A1 - Méthode pour assister le concassage par des dispositifs de démolition et dispositif appliqué dans cette méthode - Google Patents

Méthode pour assister le concassage par des dispositifs de démolition et dispositif appliqué dans cette méthode Download PDF

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Publication number
EP0486871A1
EP0486871A1 EP91118862A EP91118862A EP0486871A1 EP 0486871 A1 EP0486871 A1 EP 0486871A1 EP 91118862 A EP91118862 A EP 91118862A EP 91118862 A EP91118862 A EP 91118862A EP 0486871 A1 EP0486871 A1 EP 0486871A1
Authority
EP
European Patent Office
Prior art keywords
tool
demolition
vibration
movements
triggered
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
EP91118862A
Other languages
German (de)
English (en)
Other versions
EP0486871B1 (fr
Inventor
Robert-Jan Dr.-Ing. Bartels
Helmar Dipl.-Ing. Näfe
Jürgen Dipl.-Ing. Winkler
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.)
SIG Plastics GmbH and Co KG
Original Assignee
Krupp Maschinentechnik GmbH
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 Krupp Maschinentechnik GmbH filed Critical Krupp Maschinentechnik GmbH
Publication of EP0486871A1 publication Critical patent/EP0486871A1/fr
Application granted granted Critical
Publication of EP0486871B1 publication Critical patent/EP0486871B1/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
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/3604—Devices to connect tools to arms, booms or the like
    • E02F3/3677—Devices to connect tools to arms, booms or the like allowing movement, e.g. rotation or translation, of the tool around or along another axis as the movement implied by the boom or arms, e.g. for tilting buckets
    • E02F3/3681—Rotators
    • 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
    • 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
    • E04G2023/086—Wrecking of buildings of tanks, reservoirs or the like

Definitions

  • the invention relates to a method for improving the crushing effect of demolition tools in the form of demolition tongs or scissors with at least one driven tool blade engaging the crushing material, which can be moved with respect to a supporting body and which forms the variable jaw opening of the demolition tool with a second tool blade, and one for Execution of the procedure suitable demolition tool.
  • the demolition tool Depending on whether the demolition tool is designed as demolition tongs or demolition shears, it has two pliers jaws or scissor arms that are movable relative to one another and act on the comminution material as tool blades.
  • the drive unit acting on at least one tool blade by means of which the necessary closing force is also generated during the shredding process, can be of any desired design; In today's demolition tools it mostly consists of one cylinder unit or several cylinder units, with which, if necessary, both tool blades can be driven simultaneously.
  • DE-C 2-33 42 305 discloses a demolition grapple, known as a concrete crusher, with two jaws movably supported on a supporting body, each of which is driven by a hydraulically operating cylinder unit.
  • the demolition shear described in EP-A2-0218 899 only has a movable pliers arm with a drive unit consisting of a cylinder unit; the second gun arm is immovably attached to the associated support body.
  • Demolition tools of the type mentioned here represent an effective alternative to the hydraulic / pneumatic striking mechanism, the steel bulb or the blasting agent in many cases, especially when demolishing and renovating buildings.
  • Their advantages lie in particular in the low noise level and the possibility to shred existing reinforcements and to separate the different building materials from the shredding process from the point of view of reprocessing / reuse.
  • the previously known embodiments of demolition tools agree with each other in that they each generate a continuously effective closing force. When crushing concrete or similar building materials with and without reinforcement, the case occurs again and again that in certain work situations the breaking or cutting force exerted by the demolition tool does not lead to the desired result. Accordingly, the demolition tool has to be relocated, tracked and reattached more frequently possibly result in a considerable loss of demolition or shredding performance.
  • the invention is based on the object of developing a method for supporting the crushing action of demolition tools and a demolition tool suitable for carrying out the method, which, at least in certain cases, produce a better crushing action than previously customary embodiments and accordingly also have improved economy.
  • the object is achieved by a method which has the features of claim 1.
  • the basic idea of the invention is to at least temporarily superimpose vibratory movements on the closing force emanating from the tool blades.
  • the resulting impulse-like loading and unloading processes, which act on the shredding material in the mouth opening, may increase the shredding or destruction performance to a considerable extent.
  • the method can be advantageously designed in such a way that at least one of the tool blades is immediately set in vibration during the shredding process (claim 2); In the simplest case, this can be brought about by a vibration generator which immediately sets the relevant tool blade or the relevant tool blades in corresponding movements. However, the method can also be carried out in such a way that the vibration movements are triggered at least on one of the tool blades (claim 3); in this case the tool sheet in question is not immediately itself moved, but indirectly set in vibration - for example via a working device attached to it.
  • the vibration movements are only triggered as soon as the closing force effective between the tool blades has risen to a predetermined, adjustable minimum value (claim 4); only if the expected shredding effect cannot be achieved in normal operation, is the demolition process continued with the aforementioned vibration superposition. If the desired work progress occurs, the closing force temporarily drops below the set minimum value, so that the vibration movements are interrupted. These operations can occur during a work cycle, e.g. H. Repeat several times until the jaw opening of the demolition tool is closed.
  • the method is designed in such a way that the generation of vibratory movements is prevented as soon as the tool blades have approached a predetermined end position in the course of the closing movement (claim 6).
  • the task mentioned at the outset is further developed by a pair of demolition tongs or scissors Demolition tool with the features of claim 7 solved.
  • This has a vibration generator which can be switched on during operation of the drive unit for the at least one movable tool blade and via which vibration movements acting on the comminution material at the mouth opening can be triggered.
  • An embodiment of the demolition tool is characterized in that at least one of the two tool blades can be connected to the vibration generator in terms of drive (claim 8); this has the consequence that one tool blade or both tool blades under the action of the vibration generator with respect to the supporting body immediately executes or executes corresponding movements.
  • the vibration generator acts on the drive unit of the demolition tool, so that it causes the vibration movements of the relevant tool blade (claim 9).
  • the vibration movements can also be triggered by means of at least one striking mechanism, which is supported on a tool blade (claim 10); if necessary, each of the two tool blades can also be equipped with a plurality of striking mechanisms which act on the comminution material in the region of the mouth opening and also indirectly set the tool blades in vibration.
  • the striking mechanisms consist of a cylinder unit with a striking piston which, under the action of a pressure medium, can be displaced against the action of a reset.
  • the striking mechanisms can also have a reversal for the movement of the percussion piston, as is used in hydraulic hammers.
  • the subject matter of the invention can thereby continue be designed so that the vibration movements are triggered by a pressure medium which can be exposed to the action of a pulse generator (claim 11).
  • the pulse generator can be designed in a manner known per se, in particular as a rotary slide pulse generator which delivers a pulsating pressure medium flow; with this the drive unit (consisting of one or more cylinder units) and / or the at least one striking mechanism can be acted upon and thus put into operation.
  • the vibration movements can also be triggered by means of at least one imbalance generator, which is supported on a tool blade (claim 12).
  • a tool blade (claim 12).
  • the latter are each equipped with an imbalance generator, and preferably in such a way that the force effect emanating from the imbalance generators - with respect to the comminution material - is directed in opposite directions.
  • the demolition tool can also be designed within the framework of the teaching according to the invention in such a way that the comminution material can be vibrated both via the drive unit and via at least one percussion mechanism or an imbalance generator.
  • the vibration movements can only be triggered by actuation of a switching unit after a parameter - which represents a measure of the stress during the termination process - has risen to a predetermined, adjustable minimum value (claim 13).
  • a parameter - which represents a measure of the stress during the termination process - has risen to a predetermined, adjustable minimum value (claim 13).
  • the breaking tool is operated hydraulically, the operating pressure for the drive unit is particularly suitable as a parameter.
  • the longest possible duration of the vibratory movements can be set by means of a timer, which with the increase in Characteristic on the minimum value switches on the vibration generator (claim 14).
  • a connecting valve controlled by the operating pressure of the drive unit and having a downstream timing element, via which the pulse generator can be switched on, the energy supply of which can be interrupted via the timing element regardless of the position of the connecting valve (claim 15). If the operating pressure does not fall below this after rising to a predetermined minimum value, the pulse generator is nevertheless switched off via the timing element after a predetermined period of time, with the result that the vibration superposition is eliminated.
  • At least one driven tool blade is assigned a limit switch, via which the vibration generator is switched off when the tool blade approaches the predetermined movement in the course of the closing movement (claim 16). This prevents vibration movements from being maintained or triggered by an increase in the parameter in question to the predetermined minimum value if the tool blades abut one another after the closing movement has been completed.
  • the demolition grapple 1 shows an example of the use of demolition tongs 1 for crushing / destroying a concrete slab 3 held in the subsurface 2, in cooperation with a hydraulic excavator 4.
  • the demolition grapple 1 has, in a manner known per se, the main components of two driven jaws 5 and 6, which are movably held on a support body 7. This is rotatably attached to a connection bracket 9 via a connection plate 8, which in turn is pivotable with a Excavator boom 10 - consisting essentially of a front swivel arm 11 and a rear support arm 12 - is connected. The latter is held pivotably with respect to the platform 13 of the hydraulic excavator, which also houses the hydraulic unit 14 serving as an energy source; this also enables the demolition grapple 1 to be operated.
  • the drive unit for actuating the two jaws 5 and 6 consists of two cylinder units 15 and 16, which are articulated via their cylinder housing 15a, 16a and their piston rod 15b, 16b to the support body 7 or to the associated jaw 5 or 6; the latter components are supported outside the area of the piston rods 15b, 16b on the support body via a pivot bearing 5a or 6a and form the variable jaw opening 17 of the demolition tool into which the concrete slab 3 to be crushed protrudes during the demolition process.
  • the demolition tongs 1 are essentially symmetrical with regard to the arrangement and design of their main components with respect to the longitudinal axis 1a.
  • the right jaw 6 has a stop 18 near its pivot bearing 6a; this is arranged with respect to a limit switch 19 fastened to the support body 7 (in the form of a two-position valve) in such a way that it counteracts the action of a return spring 19a - moves into the open position, not shown, as soon as the two jaws 5 and 6 have approached a predetermined end position in the course of the closing movement, that is to say have almost come into contact with one another.
  • the aforementioned adjustment of the limit switch 19 is brought about by the fact that the stop 18 comes to rest against the button 19b of the limit switch in the course of the pivoting movement carried out by the jaw 6 and then moves it (to the right in the drawing).
  • the commissioning, switching or switching off of the demolition grapple 1 is carried out by means of a 3/2-way valve 20 (three positions, two ways), which is connected on the input side to a hydraulic source 21 or to a pressure-free return line 22 with a return filter 23; the output side is connected with the interposition of a pressure-controlled directional valve 24 via a line 25 to the extension inlet 15c, 16c of the two cylinder units 15, 16 or via a line 26 to the associated inlet inlet 15d, 16d.
  • a 3/2-way valve 20 three positions, two ways
  • the line 25 has a connecting valve 27 connected in parallel via a line branch 25a, the position of which can be influenced via a control line 27a opening into the line branch 25a - contrary to the effect of an adjustable pretensioning force.
  • the operating pressure present in the lines 25, 25a acts on the control input 24a of the directional control valve 24, a pressure-controlled timer 28 and a line 29, which can be connected to a pressure-free return 30 via the limit switch 19, if necessary.
  • the limit switch 19 assumes the indicated blocking position, the connection between the return 30 and the line 29 is interrupted. The latter may therefore - like the timer 28 and the control input 24a - be subjected to the operating pressure.
  • connection valve 27 is set in such a way that it only switches to the connection position after the operating pressure in the lines 25, 25a has risen to a set minimum value, which in turn is a measure of the amount of the cylinder units 15, 16 via the pliers jaws 5, 6 represents closing force exerted.
  • the line 25 passes through the interposition of a check valve 31 into a pulse line 32, which can be pulsed with pressure by means of a rotary slide pulse generator 33.
  • the rotary vane pulse generator which can be driven by means of a hydraulic motor 34, is connected to the second outlet of the directional control valve 24 via an inlet line 35, which is also equipped with a pressure accumulator 36.
  • the feed line 35 continues with the interposition of a pressure-controlled shut-off valve 37 into a drive line 38 for the hydraulic motor 34. whose return 39 opens into the unpressurized return line 22.
  • the pressure switch 28 optionally actuates a timer 41 via a switching line 40, which in turn is connected to the control input 37a of the check valve 37 and to an outlet 42.
  • a timer 41 via a switching line 40
  • the connection between the lines 40 and 42 is interrupted and at the same time a counting process is initiated, the duration of which can be set.
  • the check valve 37 which is pressurized via its control input 37a, assumes the open position, not shown, so that the hydraulic motor 34 is supplied with drive energy via its drive line 38, if appropriate, ie with a suitable position of the directional valve 24.
  • the timer 41 releases the unpressurized outlet 42, with the result that the pressure at the control input 37a drops and the shut-off valve 37 switches into the illustrated shut-off position: since the power supply to the hydraulic motor 34 is interrupted, it becomes during the relevant period effective rotary valve pulse generator 33 switched off.
  • the displacement of the connecting valve 27 into the connecting position also has the consequence that the directional control valve 24 switches to the second position, not shown, in which, inter alia, the connection between the lines 25 and 38 is established with the interposition of the check valve 37.
  • the pressure accumulator 36 serves to compensate for the pressure fluctuations deliberately generated during the operation of the rotary slide valve pulse generator 33, which outside the area of the cylinder units 15, 16 serve as returning pressure fluctuations are undesirable.
  • the pressure switch 28 and the time switch 41 form a timer which automatically interrupts or prevents the generation of further pulse-like pressure fluctuations after an adjustable, predetermined period of time, regardless of the position of the connecting valve 27.
  • the embodiment in question (according to FIG. 2) of the subject matter of the invention works as follows: after the demolition tongs 1 have been put into operation by moving the 3/2-way valve 20 to the right, the normal closing process is initiated by pressurizing the extension inlets 15c, 16c, one of which Pliers jaws 5, 6 exerted, which serves to crush / destroy the concrete slab 3 closing force.
  • the operating pressure in the lines 25, 25a and 27a increases, so that the connecting valve 27, which initially occupies the blocking position, finally switches over to the connecting position and thereby the directional control valve 24 into the second operating position, not shown (ie to the right) or under the influence of switches 28 and 41, the shut-off valve 37 moves into the open position.
  • the hydraulic motor 34 which is supplied with energy via the lines 25, 38, drives the rotary slide valve pulse generator 33 and deliberately generates pressure fluctuations in the lines 32, 25 and the cylinder units 15, 16 via which the jaws 5, 6 are immediately vibrated.
  • the activation of the hydraulic motor 34 and the rotary slide pulse generator 33 thus leads to the fact that the closing force is temporarily superimposed on vibratory movements, which may have the effect of breaking off from the pliers jaws supports or improves.
  • the vibration superposition remains effective as long as the connection valve 27 - depending on the operating pressure in the lines 25, 25a and 27a - assumes the connection position; in any case, however, it is limited in time by the period of time predetermined by the timer 41, after the expiration of which the outlet 42 is released and thus the rotary slide pulse generator 33 is stopped by returning the check valve 37 to the shown locked position. If no work progress can be achieved by triggering vibratory movements within a predetermined period of time, the operator has the option of opening the demolition grapple by actuating the 3/2-way valve 20 and, for example, moving it.
  • the demolition pliers shown in FIGS. 3 and 4 initially differ purely in design from the embodiment described above in that both jaws 5 and 6 (essentially only the jaw 6 is shown) only one tooth projecting in the direction of the longitudinal axis 1a (for example 6b) and are equipped with two striking mechanisms 43 in the area of each tooth; these lie - seen transversely to the plane of the drawing (Fig. 3) - in the area of the tooth at a distance from each other (Fig. 4).
  • Each striking mechanism has a piston rod 43a, which can be extended with respect to the jaw of the pliers, together with piston 43b, which, contrary to the action of a return spring 45, is directed outwards via a pulse line 44, i. H. is displaceable in the direction of the concrete block 3 to be crushed.
  • the extension inputs of the cylinder units - for example the extension input 16c of the cylinder unit 16 - are connected via the line branch 25a and the line 25 to the 3/2-way valve 20 already mentioned.
  • the connecting valve 27 also connected to the line branch 25a influences, via a control input 46a, the position of a spring-loaded check valve 46, which in the open position connects the line 25 with the drive line 38 for the hydraulic motor 34, with the inlet line 35 for the rotary valve pulse generator 33 and connects to the pressure accumulator 36.
  • the rotary vane pulse generator can be operated via the already mentioned impulse line 44 drive the striking mechanisms 43 attached to the pliers jaws.
  • the embodiment in question works as follows: By actuating the 3/2-way valve 20 by moving it to the right, the cylinder units are pressurized via the lines 25, 25a in the sense of their extension movement; this leads to the fact that the jaws of the pliers come into contact with the concrete slab 3 to be shredded via their teeth and act on the closing force caused by the cylinder units.
  • the striking mechanisms 43 are not in operation during this time, since the blocking valve 46 assumes the blocking position shown in FIG. 3, the rotary slide pulse generator 33 is accordingly not effective and the pulse line is not pressurized.
  • the piston rods 43a and piston 43b assume the retracted rest position indicated in FIG. 4 under the action of the return springs 45.
  • the last-described embodiment of the subject matter of the invention - based on the embodiment according to FIG. 2 - can be advantageously configured in that the cut-in valve 27 is connected to the check valve 46 with the interposition of the pressure switch 28, the switching line 40, the timer 41 and the outlet 42 .
  • the shutoff valve 46 is automatically switched to the illustrated shutoff position after an adjustable, predetermined period of time, regardless of the position of the connecting valve 27, whereby the power supply to the hydraulic motor 34 is interrupted.
  • the vibratory movements of the clamping jaws 5 and 6 are triggered by means of the unbalance generator 47 attached to the latter. These are arranged and designed in such a way that the force effect emanating from them - in relation to the concrete slab 3 to be crushed (cf. FIG. 3 for example) - is directed in opposite directions to one another.
  • the demolition grapple can also be designed and switched within the scope of the invention such that it allows several types of vibration superposition, that is, the pulse-like action on the cylinder units 15, 16 according to FIG. 2 and the action of the crushing material (concrete slab 3) by switching on striking mechanisms or unbalance generators which are attached to the pliers jaws.
  • the two vibration superimpositions can be activated separately from one another, so that they can - depending on the operating conditions - be effective simultaneously or in succession if necessary. If, for example, the vibrating movements of the pliers jaws do not yet make any progress, this can possibly be brought about by switching on or switching on the striking mechanism or unbalance generator.
  • a characteristic variable which represents a measure of the stress on the demolition grapple during the demolition process, is preferably determined and displayed. On the basis of this display, an operator can initiate the vibration superimposition and, if this does not lead to the desired work progress, switch it off after a period that appears to be suitable.
  • the advantage achieved with the invention is to be seen in that the crushing / demolition effect of the demolition tool can be improved or supported in the form of demolition tongs or demolition shears.
  • the effect sought with the invention can also be different when used designed components for the generation of the vibration movements (drive unit, pulse generator, impact mechanism, unbalance generator) can be brought about.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Crushing And Grinding (AREA)
  • Working Measures On Existing Buildindgs (AREA)
EP91118862A 1990-11-17 1991-11-06 Méthode pour assister le concassage par des dispositifs de démolition et dispositif appliqué dans cette méthode Expired - Lifetime EP0486871B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4036705A DE4036705A1 (de) 1990-11-17 1990-11-17 Verfahren zur unterstuetzung der zerkleinerungswirkung von abbruchwerkzeugen und zur durchfuehrung des verfahrens geeignetes abbruchwerkzeug
DE4036705 1990-11-17

Publications (2)

Publication Number Publication Date
EP0486871A1 true EP0486871A1 (fr) 1992-05-27
EP0486871B1 EP0486871B1 (fr) 1996-01-31

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Application Number Title Priority Date Filing Date
EP91118862A Expired - Lifetime EP0486871B1 (fr) 1990-11-17 1991-11-06 Méthode pour assister le concassage par des dispositifs de démolition et dispositif appliqué dans cette méthode

Country Status (5)

Country Link
US (1) US5273217A (fr)
EP (1) EP0486871B1 (fr)
JP (1) JPH04265361A (fr)
AT (1) ATE133741T1 (fr)
DE (2) DE4036705A1 (fr)

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USD715331S1 (en) * 2014-02-12 2014-10-14 Company Wrench, Ltd. Auxiliary power unit excavator
CN106077788B (zh) * 2016-06-29 2017-10-17 苏州市吴中区木渎华利模具加工店 天线端子自动压合机的废料切割组件
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FR2609296A3 (fr) * 1986-07-30 1988-07-08 Koehl Jean Marie Appareil de terrassement, remblaiement, compactage, battage, arrachage, decoupe d'enrobes a monter sur pelle hydraulique
DE3802001A1 (de) * 1987-04-22 1988-07-07 Frankfurt Wohnungsbau Veb Vorrichtung zum zerstoeren von betonelementen
EP0404229A2 (fr) * 1989-06-20 1990-12-27 Verachtert Beheer B.V. Dispositif pour casser des éléments en béton ou matière similaire

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2486242A (en) * 2010-12-09 2012-06-13 Buckhurst Group Ltd Pipe crushing apparatus with cylindrical jaw arrangement
GB2486242B (en) * 2010-12-09 2016-12-21 Buckhurst Group Ltd Apparatus for crushing pipes

Also Published As

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US5273217A (en) 1993-12-28
ATE133741T1 (de) 1996-02-15
EP0486871B1 (fr) 1996-01-31
DE59107341D1 (de) 1996-03-14
DE4036705A1 (de) 1991-10-31
JPH04265361A (ja) 1992-09-21

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