EP0486898B1 - Procédé et dispositif pour ajustage des caractéristiques de travail d'un mécanisme à coup à la dureté des materiaux à broyer - Google Patents

Procédé et dispositif pour ajustage des caractéristiques de travail d'un mécanisme à coup à la dureté des materiaux à broyer Download PDF

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Publication number
EP0486898B1
EP0486898B1 EP91119042A EP91119042A EP0486898B1 EP 0486898 B1 EP0486898 B1 EP 0486898B1 EP 91119042 A EP91119042 A EP 91119042A EP 91119042 A EP91119042 A EP 91119042A EP 0486898 B1 EP0486898 B1 EP 0486898B1
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EP
European Patent Office
Prior art keywords
impact
impact mechanism
stroke
limit value
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP91119042A
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German (de)
English (en)
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EP0486898A1 (fr
Inventor
Friedrich Karl Dr.-Ing. Arndt
Robert-Jan Dr.-Ing. Bartels
Heribert Vielhaber
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SIG Plastics GmbH and Co KG
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Krupp Maschinentechnik GmbH
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Publication of EP0486898A1 publication Critical patent/EP0486898A1/fr
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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
    • E02F3/966—Dredgers; Soil-shifting machines mechanically-driven with arrangements for alternate or simultaneous use of different digging elements of hammer-type tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25D—PERCUSSIVE TOOLS
    • B25D9/00—Portable percussive tools with fluid-pressure drive, i.e. driven directly by fluids, e.g. having several percussive tool bits operated simultaneously
    • B25D9/14—Control devices for the reciprocating piston
    • B25D9/26—Control devices for adjusting the stroke of the piston or the force or frequency of impact thereof

Definitions

  • the invention relates to a method for adapting the working behavior of a striking mechanism without or with stroke adjustment, the impact piston of which performs reciprocating movements under the action of the hydraulic drive means supplied by a conveying unit, to the hardness of the comminution material and a device suitable for carrying out the adaptation method.
  • Hydraulically operated striking mechanisms form a chain of action with the conveyor unit on one side and the tool (in particular chisel) with the comminution material on the other side, through which an energy flow flows in both directions.
  • the primary energy flow is directed from the conveyor unit via the striking mechanism and the tool to the comminution material (in particular rock); the secondary energy flow reflected by the shredding material acts via the striking mechanism to the conveyor unit.
  • the properties of the comminution material and the tool are expressed by the reflection factor R, which is an indirectly measurable variable and is defined by the ratio of primary impact energy / reflected impact energy.
  • the energy balance and the Impact characteristics ie the ratio of impact number to single impact energy of an impact mechanism.
  • the working behavior of a striking mechanism should be adapted in such a way that the individual impact energy increases with increasing material hardness, that is to say with increasing size of the reflection factor.
  • a single impact energy which is too low leads to undesirable reflections, with the result that only a low comminution performance can be achieved with high tool and impact mechanism stress.
  • GB-A-1 294 901 describes a ramming device with an impact mechanism, the number of impacts of which is regulated as a function of the respective depth of penetration of the ramming material; this is done by adjusting a pressure valve accordingly.
  • the invention has for its object to develop a method and a device for hydraulically operated striking mechanisms for automatically adapting the working behavior to the hardness of the comminution material, in which the individual impact energy required for material shredding is automatically adapted to the changing hardness of the shredding material. If, due to the design, it is not possible to adjust the individual impact energy, it should be prevented that the impact energy recovered by reflection processes leads to an undesirable increase in the number of percussion pistons.
  • the invention should also make it possible, if necessary, to arrange essential and sensitive components (in particular sensors and controllers) independently of the striking mechanism, so that they are reliable and easy to repair and can be used on differently designed striking mechanisms.
  • the invention is preferably used on impact mechanisms with (the aforementioned) energy recovery, which is described in the document EP-A-0 183 093. This version assumes that the percussion piston is temporarily connected to the pressure line with the operating pressure after the impact during the return stroke.
  • the object is achieved by a method which has the features of claim 1.
  • the basic idea of the invention is to build up the control for adapting the working behavior by at least one measuring process outside the striking mechanism to the measured variable percussion piston stroke number or the measured variables from percussion piston stroke number and input volume flow into the striking mechanism convert and use to change the internal resistance of one of the two interacting work units, namely the conveyor unit or the striking mechanism:
  • the Impact number or a performance parameter formed from the measured variable of the impact number and the input quantity flow to an adjustable limit value
  • the internal resistance of one of the two working units is increased.
  • this change causes the number of strokes to be reduced.
  • the invention makes use of the knowledge known per se that the impact rate of a percussion mechanism changes with the properties of the comminution material, that is to say increases with increasing size of the reflection factor, and that the ratio of impact rate and input flow rate also increases with the size of the reflection factor.
  • the quantities to be measured i.e. the number of blows and, if necessary, additionally the input flow into the striking mechanism, can be detected by means of sensors known per se as part of a sound wave or vibration measurement or a flow measurement influenced by the number of blows and converted into a control command.
  • the internal resistance of the striking mechanism can be increased by correspondingly increasing the pressure in the return line (return resistance), against which the percussion piston executes the return stroke;
  • return resistance pressure in the return line
  • a throttle valve which defines the cross section of the return line is adjusted on the basis of the control command obtained from the stroke number measured variable (claim 2). If, with increasing size of the reflection factor, the measured quantity of the number of impacts increases to a predetermined limit value, the control command obtained from this measured quantity is used to Return resistance increases, which reduces the maximum return stroke speed of the percussion piston, ie the return stroke start speed, and thus limits the increase in the number of strokes.
  • the adaptation of the working behavior of the striking mechanism to the changing hardness of the comminution material can instead also be brought about by influencing the internal resistance of the conveyor unit; by definition, their internal resistance increases when the emerging flow rate is reduced by reducing the delivery volume. If the number of strokes increases to the specified limit value, the flow rate is reduced by the control command until the number of strokes has again reached the specified limit value.
  • the method can be carried out in such a way that the drive means input quantity received by the striking mechanism is also determined as a measured variable and an actual measured variable ratio value is formed from the measured variable ratio of the number of blows / input quantity. If this rises to a limit value that is specified as a function of the size of the stroke mechanism stroke set, the stroke resistance is increased by stroke adjustment. Since the mentioned measured variable ratio actual value also increases with increasing size of the reflection factor, the increase in the stroke of the striking mechanism which is finally triggered by the control command leads to a corresponding change in the individual impact energy acting on the comminution material.
  • the relevant measurand ratio limit is included adapted to the currently set stroke stroke size; the method accordingly works with a switchable measurement variable ratio limit.
  • the previously described embodiment of the method can be further developed in that the impact number limit value is specified as a function of the size of the impact mechanism stroke set in each case (claim 3); In this way it is ensured that the number of impacts always returns below the associated number of impacts in the area which is determined by the size of a stroke of the impact mechanism.
  • the size of the delivery flow can be influenced by adjusting the delivery volume of the delivery unit, this is - if necessary also additionally - reduced if the operating pressure in the delivery flow rises to a predetermined pressure limit value (claim 4);
  • a predetermined pressure limit value (claim 4);
  • the pressure limit value is expediently specified as a function of the size of the impact mechanism stroke set in each case (claim 5); This creates the possibility of adapting the pressure limit value to different areas determined by the size of the striking stroke.
  • a striking mechanism with stroke adjustment is described in the previously mentioned prior publication DE-C3-26 58 455.
  • the stroke of the percussion piston can then be changed via a spring-loaded control slide, which - depending on the size of a control pressure acting on it - releases or blocks differently arranged control grooves and control channels, thereby reversing the movement of the Impact piston affected.
  • the size of the control pressure - which can be detected in a simple manner by means of a pressure sensor - thus corresponds to a specific size of the percussion piston stroke currently set.
  • the object on which the invention is based is further achieved by a device having the features of claim 6.
  • Essential components of the device suitable for carrying out the method are a stroke number sensor which detects the percussion piston stroke number and is located outside the percussion mechanism, a stroke number regulator connected downstream of this and an actuator controlled by this, via which the internal resistance of the delivery unit or the percussion mechanism is increased, if the measured quantity of the stroke rate increases to a predetermined limit.
  • the actuator consists of an adjustment throttle, which is installed in the return line of the striking mechanism, or is designed as an adjustment drive, via which the delivery volume of the delivery unit is changed.
  • Another type of device for carrying out the method has two sensors arranged outside the percussion mechanism, namely a stroke number sensor which detects the percussion piston stroke number and an input current sensor for determining the input quantity flow recorded by the percussion mechanism.
  • Other essential components of this device are an arithmetic unit for forming a z / Q actual value from the ratio between the measured variable of the beat number and the input quantity flow, a controller processing the z / Q actual value and an actuator connected downstream for influencing the internal movement of the percussion mechanism.
  • the stroke number controller connected downstream of the stroke number sensor is designed in such a way that it only becomes effective if the measured quantity of the stroke number increases to a limit value which is predetermined as a function of the respectively set size of the stroke mechanism stroke (claim 7).
  • the stroke number controller ensures that the stroke number is repeatedly lowered below a limit value which is adapted to the size of the stroke stroke currently set.
  • the device according to claim 6 or 7 may additionally have a pressure sensor which records the operating pressure in the delivery line of the delivery unit, a downstream pressure regulator and an adjustment drive controlled by the latter, under the action of which the delivery volume of the delivery unit is reduced if the measured variable of the operating pressure increases a predetermined pressure limit increases (claim 8).
  • a further adjustment to the respective working area of the striking mechanism can be brought about in that the pressure limit value is specified as a function of the size of the stroke mechanism stroke set in each case by means of a pressure limit value sensor which detects it (claim 9); in such an embodiment, the pressure limit value is also adapted to the currently set size of the striking mechanism stroke.
  • the hydraulic excavator 1 shown in FIG. 1 has a diesel engine 2 as a supply unit, which among other things drives a hydraulic pump 3; this is connected via a pressure line 4 and a return line 5 to a hydraulic hammer 6, which in turn is held in an adjustable manner on the boom 7 of the hydraulic excavator with two boom arms 7a, 7b.
  • the percussion piston 8 of the hydraulic hammer Under the action of the delivery flow supplied via the pressure line 4, the percussion piston 8 of the hydraulic hammer performs an alternating movement in the direction of its longitudinal axis 8a, strikes a tool designed as a chisel 9 at the end of its stroke and acts on the comminution material 10 via this; the kinetic energy of the percussion piston 8 is converted into impact energy.
  • the chisel 9 (cf. FIG. 1) is broken down into two active arrows 9a, 9b; the different properties of the Comminution material 10 are indicated by the symbol 11 with R as the reflection factor.
  • the delivery flow Q p supplied by the hydraulic pump 3 reaches the operating pressure via the pressure line 4 to the hydraulic hammer 6, which receives the input flow rate Q e and converts it into hydraulic impact power via the percussion piston. Any power recovery within the hydraulic hammer is indicated by the virtual pump 12 with the reflection flow Q R , through which the recovered mechanical power is converted into hydraulic power.
  • the reflection quantity flow Q R increases with the size of the reflection factor R: If the reflection factor has the value zero, the virtual pump 12 accordingly does not deliver a reflection quantity flow Q R.
  • the arrow 9a pointing to the right symbolizes the primary energy flow emanating from the hydraulic hammer, while the arrow 9b symbolizes the reflected energy flow acting on the hydraulic hammer, which may result in the generation of the reflection quantity flow Q R.
  • the reflection factor R of the comminution material 10 (cf. FIG. 1) does not have the value zero, the input quantity flow Q e received by the hydraulic hammer 6 is smaller than the delivery flow Q p supplied by the hydraulic pump 3; Unless countermeasures are taken, this operating state leads to the operating pressure in the pressure line 4 rising.
  • the device in question is equipped with a stroke rate sensor 13, which is arranged outside the hydraulic hammer.
  • a stroke rate sensor 13 which is arranged outside the hydraulic hammer.
  • the Impact rate sensor working in the manner of a sound wave or vibration sensor detects - indicated by the broken line 14 - the sound waves or vibrations which are caused by the operation of the hydraulic hammer and is converted into a measured variable z which is transmitted via a measuring line 15 in a stroke number controller 16 is transferred; an adjustable beat number limit value z o is also transmitted to this via a limit indicator 17 together with line 18.
  • the stroke number controller 16 is followed by an actuator in the form of an adjusting motor 20, via which - indicated by line 21 - the delivery volume of the hydraulic pump 3 can be changed; in the present case it is designed as a variable displacement pump. If, during operation of the hydraulic hammer 6, the number of strokes z determined as the measured variable increases to the predetermined limit of the number of strokes z o , the stroke number controller 16 generates a control command which is forwarded to the adjusting motor 20 and which, by reducing the delivery volume, reduces the delivery flow in the pressure line 4 as long returns until the beat number z has reached the predetermined beat number limit again.
  • the embodiment of the subject matter of the invention in question thus makes it possible to adapt the working behavior of the impact mechanism to changing properties of the comminution material, embodied by the reflection factor R, on the basis of a continuous determination of the size of the impact number;
  • the required stroke rate sensor 13 can be designed in a manner known per se and can be arranged outside the hydraulic hammer, for example in an environment largely free of shocks and vibrations.
  • the one achieved Another advantage is that the device in question can be used regardless of the design of the hydraulic hammer or hammer mechanism.
  • the hydraulic hammer 6 is connected via the pressure line 4 to a hydraulic pump 3 with a constant delivery volume; An undesirable increase in the operating pressure in the pressure line is prevented by a pressure relief valve 22, the connecting line 23 of which comes from the pressure line 4.
  • the impact rate controller 16 is connected on the output side via a control line 24 to an adjusting throttle 25 which is installed in the return line 5 of the hydraulic hammer 6. By actuating the adjusting throttle, the return resistance - and thus the return pressure in the return line 5 - can be influenced, with the result that the return stroke speed of the percussion piston 8 changes.
  • the adjusting throttle 25 executes a closing movement under the influence of a regulator command generated by the stroke number controller 16, on the basis of which the movement of the hydraulic hammer 6 with increased internal resistance Percussion piston 8 is delayed until the measured quantity of the stroke number z again matches the stroke number limit value.
  • a change in the internal resistance of the hydraulic hammer may become more consequent Lowered stroke rate triggered.
  • the increase in the operating pressure occurring in the pressure line 4 may lead to the pressure relief valve 22 opening and a partial flow Q V beginning to flow off.
  • the regulation for adapting the working behavior of the hydraulic hammer 12 is based on two continuously determined measured variables, namely the number of strokes z detected by the stroke number sensor 13 and the input quantity flow into the hydraulic hammer 6 detected by an input current sensor 26.
  • the input current sensor which operates in a manner known per se in the manner of a flow meter, is installed in the pressure line 4 between the connecting line 23 for the pressure limiting valve 22 and the hydraulic hammer 6.
  • the measured variables obtained by means of the sensors 13 and 26 - number of blows z and input quantity flow Q e - are fed via a control line 27 or 28 to a computing element 29, in which a z / Q actual value is formed from the ratio between the two measured variables, which an input 30 is transmitted to a controller 31.
  • This in turn is connected via a control line 32 to an actuator 33, via which - indicated by an arrow 34 - the size of the striking stroke can be changed; the embodiment in question therefore requires the use of a hydraulic hammer with stroke adjustment.
  • the impact mechanism stroke ⁇ s can be changed in a manner known per se in several stages, which are indicated by "n" (cf. also the already mentioned DE-C3-26 58 455).
  • the actuator 33 On the output side, the actuator 33 is connected to the input side of the controller 31 with the interposition of a z / Q limit transmitter 35. From Actuator 33 receives the component 35 control commands which adapt the limit value (z / Q) 0 to the stroke of the percussion piston 8 currently set.
  • the controller 31 acts on the actuator 33 via a controller command and acts on the hydraulic hammer 6 in the sense of a change in the internal resistance if the actual z / Q value supplied by the computing element 29 reaches the limit value specified by the z / Q limit transmitter 35 .
  • the regulation is based on the knowledge that the ratio between the measured variable of the beat number z and the input quantity flow Q e also increases with increasing values of the reflection factor R.
  • the actuator 33 increases the percussion piston stroke and thus a corresponding change in the internal resistance of the hydraulic hammer 6, which increases with otherwise unchanged working conditions the single impact energy and a decrease in the impact rate.
  • the actual z / Q value decreases accordingly.
  • the embodiment according to FIG. 4 can advantageously be designed such that the impact number limit value z0 is also specified as a function of the size of the impact piston stroke set in each case.
  • Such an embodiment can be seen from FIG. 5, the hydraulic hammer 6 being shown for the sake of clarity without the virtual pump 12 indicating energy recovery (cf. FIG. 4).
  • the one in question is Device is additionally equipped with a stroke ⁇ number limit transmitter 17, a stroke number controller 16 and an actuator connected downstream thereof in the form of an adjusting throttle 25; the latter is - as already explained with reference to FIG. 3 - installed in the return line 5 of the hydraulic hammer 6.
  • the impact rate controller 16 is connected on the input side via a measuring line 36 to the impact rate sensor 13 and via the input 18 to the impact rate limit transmitter 17.
  • the latter receives control commands from the actuator 33 via a signal line 37, which switch the stroke number limit value z0 according to the size of the stroke of the piston.
  • the stroke number controller 16 triggers a reduction in the flow cross section in the return line 5 determined by the adjusting throttle 25 via the control line 24; this change has the consequence that the internal resistance of the hydraulic hammer 6 (associated with an increase in the return pressure in the return line 5) increases and the number of strokes z decreases.
  • the described configuration thus ensures that the impact number in each area, which is determined by the size of the respective impact piston stroke, is limited to the size of the adjusted number of impact limits z réelle (n) under the action of the impact number controller 16.
  • the hydraulic pump 3 can also be designed as a variable displacement pump with a variable delivery volume, the operating state of which is monitored and, if necessary, adapted by means of a pressure control (FIG. 6 ).
  • the hydraulic pump 3 with a Pressure sensor 38 equipped, which acts on an adjustment drive 40 via a control line 39;
  • the size of the delivery volume of the hydraulic pump 3 can be changed via this - indicated by an arrow 41.
  • the pressure regulator 38 is connected on the input side with the interposition of a pressure sensor 42 via a measuring line 43 to the pressure line 4 and is also connected via an input 44 to a pressure limit indicator 45.
  • the advantage achieved with this additional pressure control is that the hydraulic hammer 6 can be acted upon with the maximum permissible operating pressure.
  • FIG. 7 shows an advantageous embodiment of the embodiment according to FIG. 5 in the event that the hydraulic pump 3 - according to FIG. 6 - is designed as a variable displacement pump with a variable delivery volume and pressure control.
  • the pressure limit transmitter 45 is additionally connected via a line 46 to the actuator 33 to influence the size of the percussion piston stroke. By control commands coming from the actuator 33, the pressure limit value p0 predetermined by the pressure limit transmitter 45 is adapted in size to the currently set percussion piston stroke.
  • the measurement of the performance parameter of interest of the percussion mechanism is carried out using sensors which are arranged outside the percussion mechanism.
  • the advantage achieved with the invention is therefore that the adaptation of the working behavior of hydraulically operated striking mechanisms to the measurement of at least one of the two performance parameters of the striking mechanism - percussion piston stroke number z and input flow rate Q e into the striking mechanism - is attributed to the outside of the striking mechanism - and thus largely regardless of this - is executed; Corresponding controllers can accordingly be optimally designed and attached and also used with differently designed striking mechanisms.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Percussive Tools And Related Accessories (AREA)
  • Chutes (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Pulverization Processes (AREA)

Claims (9)

  1. Procédé pour ajuster, à la dureté du matériau à fragmenter (10), le comportement de travail d'un mécanisme de frappe (6), comportant ou non un ajustement de course et dont le piston de frappe (8) exécute des mouvements de va-et-vient sous l'effet du moyen d'entraînement hydraulique fourni par l'unité de fourniture d'énergie (3),
    caractérisé en ce que, des deux caractéristiques de puissance du mécanisme de frappe (6), obtenues en dehors du mécanisme de frappe, sous la forme de grandeurs mesurées, - débit d'entrée (Qe) dans le mécanisme de frappe et fréquence de frappe (z) du piston de frappe -, au moins la dernière est transformée, dans une unité de régulation, en ordre de réglage, et est transmise, pour la mise en oeuvre, à un organe de réglage qui augmente la résistance interne de l'une des deux unités de travail - l'unité de fourniture d'énergie (3) ou le mécanisme de frappe (6) - par une augmentation des deux valeurs de mesure, ou, du moins de l'une d'elles, en les portant, ou en la portant, à une valeur de consigne, réglable, de ces grandeurs caractéristiques de la puissance:
    - soit de façon à augmenter la résistance de retour du mécanisme de frappe (6) en fonction de l'ordre de réglage obtenu à partir de la grandeur mesurant la fréquence de frappe (z),
    - soit de façon à agir par l'ordre de réglage obtenu à partir de la valeur mesurée de la fréquence de frappe (z), sur le débit (Qp) de l'unité de fourniture d'énergie (3), en réglant le débit volumique de cette unité,
    - soit de façon à régler la course du mécanisme de frappe si la valeur réelle du rapport de valeurs de mesures, formé en divisant les grandeurs de mesure de la fréquence de frappe (z) par le débit d'entrée (Qe) dans le mécanisme de frappe (6) créé à partir du moyen d'entraînement, augmente jusqu'à une valeur de limite, qui est prédéfinie en fonction de la grandeur de la course du mécanisme de frappe (6), qui a été réglée dans chaque cas.
  2. Procédé suivant la revendication 1, caractérisé en ce qu'en fonction de l'ordre de réglage obtenu à partir de la grandeur mesurant la fréquence de frappe (z), on règle une soupape d'étranglement (25) déterminant la section de la conduite de retour (5) du mécanisme de frappe (6).
  3. Procédé suivant la revendication 1, caractérisé en ce que la valeur de limite de la fréquence de frappe (z) est prédéterminée en fonction de la grandeur de réglage, réglée dans chaque cas, de la course du mécanisme de frappe (6).
  4. Procédé suivant l'une des revendications 1 à 3, caractérisé en ce que le débit (Qp) de l'unité de fourniture d'énergie (3) est réduit en réglant son débit volumique pour le cas où la pression de fonctionnement dans le débit du courant augmente jusqu'à une valeur de limité prédéfinie de la pression.
  5. Procédé suivant la revendication 4 et au moins l'une des revendications 1 et 3, caractérisé en ce que la valeur de limite de la pression est prédéfinie en fonction de la grandeur de la course du mécanisme de frappe, qui a été réglée dans chaque cas.
  6. Dispositif pour ajuster le comportement de travail d'un mécanisme de frappe (6) au moyen du procédé suivant au moins l'une des revendications précédentes, comportant au moins un capteur (13) mesurant la fréquence de frappe (z), et un régulateur (16) de la fréquence de frappe (z), réglé au moyen de ce capteur,
    caractérisé en ce que
    le capteur (13) mesurant la fréquence de frappe est disposé en dehors du mécanisme de frappe (6) et un organe de réglage (respectif 20 et 25) est commandé par le régulateur (16) de la fréquence de frappe, cet organe de réglage augmentant la résistance interne de l'une des unités de travail - unité de fourniture d'énergie (3) ou mécanisme de frappe (6) - si la grandeur mesurée de la fréquence de frappe augmente jusqu'à une valeur de limite prédéfinie (z₀),
    étant entendu que l'organe de réglage est constitué soit d'une soupape de réglage (25), installée dans la conduite de retour (5) du mécanisme de frappe (6), soit d'un mécanisme de réglage (20), qui modifie le volume (Qp) produit par l'unité de fourniture d'énergie (3).
  7. Dispositif pour ajuster le comportement de travail d'un mécanisme de frappe (6) au moyen du procédé suivant au moins l'une des revendications 1 à 5, comportant un capteur (13) mesurant la fréquence de frappe (z) du piston de frappe,
    caractérisé par un capteur (26), mesurant le courant d'entrée (Qe) admis par le mécanisme de frappe (6), ce capteur (26) étant, de même que le capteur (13) mesurant la fréquence de frappe (z), disposé à l'extérieur du mécanisme de frappe (6), par un organe de calcul (29) destiné à former une valeur réelle z/Q à partir du rapport des grandeurs mesurées de la fréquence de frappe (z) par le débit d'entrée (Qe), par un régulateur (31) exploitant la valeur réelle z/Q, et par un organe de réglage (33), placé en aval de ce dernier et destiné à agir sur la résistance interne du mécanisme de frappe (6),
    étant entendu que - pour le cas où la valeur réelle du rapport des grandeurs mesurées z/Q augmente jusqu'à une valeur de limite ((z/Q)₀) prédéfinie mais modifiable - cette résistance est augmentée, au moyen du régulateur (31), par le fait que
    - soit la grandeur de la course du mécanisme de frappe est modifiée graduellement par l'organe de réglage (33),
    - soit un étranglement de réglage (25), installé dans la conduite de retour (5) du mécanisme de frappe (6), est réglé par un régulateur (16) de la fréquence de frappe, placé en aval du capteur (13) mesurant la fréquence de frappe et agissant seulement si la grandeur mesurée de la fréquence de frappe (z) augmente jusqu'à une grandeur de limite (z₀), qui est prédéterminée en fonction de la grandeur réglée chaque fois pour la course de frappe.
  8. Dispositif suivant la revendication 7 ou la revendication 8, caractérisé par un détecteur de pression (42), qui détermine la pression de fonctionnement (p) dans la conduite (4) arrivant de l'unité de fourniture d'énergie (3), par un régulateur de pression (38) placé en aval et par un dispositif de réglage (40), sous l'effet duquel le débit (Qp) de l'unité de fourniture d'énergie (3) est réduit si la grandeur mesurée de la pression de fonctionnement (p) augmente jusqu'à une grandeur de limite (p₀) prédéfinie.
  9. Dispositif suivant la revendication 8, caractérisé en ce que la valeur de limite de la pression (p₀) est prédéterminée, en fonction de la grandeur chaque fois réglée pour la course de frappe, au moyen d'un dispositif (45) déterminant la grandeur de limite de la pression et mesurant la grandeur de cette course.
EP91119042A 1990-11-20 1991-11-08 Procédé et dispositif pour ajustage des caractéristiques de travail d'un mécanisme à coup à la dureté des materiaux à broyer Expired - Lifetime EP0486898B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4036918 1990-11-20
DE4036918A DE4036918A1 (de) 1990-11-20 1990-11-20 Verfahren zur anpassung des arbeitsverhaltens eines schlagwerks an die haerte des zerkleinerungsmaterials und einrichtung zur durchfuehrung des verfahrens

Publications (2)

Publication Number Publication Date
EP0486898A1 EP0486898A1 (fr) 1992-05-27
EP0486898B1 true EP0486898B1 (fr) 1996-05-01

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EP91119042A Expired - Lifetime EP0486898B1 (fr) 1990-11-20 1991-11-08 Procédé et dispositif pour ajustage des caractéristiques de travail d'un mécanisme à coup à la dureté des materiaux à broyer

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US (1) US5174387A (fr)
EP (1) EP0486898B1 (fr)
JP (1) JPH04289083A (fr)
AT (1) ATE137431T1 (fr)
DE (2) DE4036918A1 (fr)

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CN104532897B (zh) * 2014-12-23 2016-07-27 南京工业职业技术学院 一种自适应智能液气压冲击破碎锤
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KR101926916B1 (ko) * 2016-07-27 2018-12-10 대모 엔지니어링 주식회사 유압식 타격 기기의 모니터링 방법 및 이를 수행하는 시스템
CN108343651B (zh) * 2017-12-21 2021-03-16 中国神华能源股份有限公司 养路机械作业装置应急救援方法
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Also Published As

Publication number Publication date
ATE137431T1 (de) 1996-05-15
DE4036918A1 (de) 1992-05-21
DE59107760D1 (de) 1996-06-05
JPH04289083A (ja) 1992-10-14
EP0486898A1 (fr) 1992-05-27
US5174387A (en) 1992-12-29

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