EP3936234B1 - Installation de concassage mobile et procédé de fabrication d'un produit final minéral en grain concassé - Google Patents

Installation de concassage mobile et procédé de fabrication d'un produit final minéral en grain concassé Download PDF

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Publication number
EP3936234B1
EP3936234B1 EP21182364.6A EP21182364A EP3936234B1 EP 3936234 B1 EP3936234 B1 EP 3936234B1 EP 21182364 A EP21182364 A EP 21182364A EP 3936234 B1 EP3936234 B1 EP 3936234B1
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EP
European Patent Office
Prior art keywords
grain
proportion
valuable
unit
oversize
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EP21182364.6A
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German (de)
English (en)
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EP3936234A1 (fr
Inventor
Frederik HOOGENDOORN
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.)
Keestrack NV
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Keestrack NV
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C13/00—Disintegrating by mills having rotary beater elements ; Hammer mills
    • B02C13/02—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft
    • B02C13/06—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor
    • B02C13/09—Disintegrating by mills having rotary beater elements ; Hammer mills with horizontal rotor shaft with beaters rigidly connected to the rotor and throwing the material against an anvil or impact plate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B02C21/02—Transportable disintegrating plant
    • B02C21/026—Transportable disintegrating plant self-propelled

Definitions

  • the invention relates to a mobile crushing plant with the features of patent claim 1 and a method for producing a crushed mineral end grain product according to the features of patent claim 8.
  • a crushing plant is from US4544102 known.
  • Mobile crushing plants are used for crushing primary mineral raw materials or for crushing secondary raw materials (mineral recycling materials) on site.
  • the crushed aggregate from primary material is produced, for example, in a quarry or gravel works or, in the case of secondary material (sorted building rubble), on a construction site.
  • the production of fine chippings is particularly interesting from an economic point of view.
  • B. is used in top layers of asphalt. Fine chippings are roughly cubic in shape and are usually broken twice. The production of fine chippings usually takes place in Splitting works that are set up directly in the extraction sites.
  • the construction of a splitting plant is complex. Mobile extraction units can be used more flexibly. However, the grain size distribution can change with increasing wear on the shredder and the proportion of valuable grains can be lower than the production capacities allow. There is room for improvement here.
  • the invention is based on the object of demonstrating a mobile crushing plant with which the most flexible possible use for the production of a crushed, mineral end grain product is possible, e.g. for the production of fine chippings, the crushed end grain product being as constant as possible in the desired grading curve distribution over the entire wear period of the mobile Crushing plant can be produced and in which a quantitatively constant production is possible.
  • crushed mineral end grain product is to be shown, which makes it possible to produce the crushed end grain product in the desired grading curve distribution over a wear period that is as long as possible and in particular the entire wear period.
  • the first task is solved by a mobile crushing plant with the features of patent claim 1 .
  • a method that solves this problem is the subject of patent claim 8.
  • the mobile crushing plant has a reversible impact crusher as a crusher.
  • the mobile crushing plant can be integrated into a production chain, which will not be discussed further here because it is familiar to a person skilled in the art.
  • a crushing plant within the meaning of the invention is mobile if it has a chassis with wheels or chains or skids on which the crushing plant can be moved slidably.
  • the desired aggregate can be produced on site over a very long period of wear with consistent quality and with maximum utilization of the wearing components of the crusher, without that this requires the construction of a stationary system, eg a splitting plant.
  • a coarse aggregate is placed in a dosable feed unit for the material to be crushed.
  • material is used below for both mineral primary raw materials and secondary raw materials.
  • the raw materials can be pre-crushed.
  • the material from the feed unit is fed to the shredder.
  • a screening unit is located downstream of the shredder for screening out oversized grain.
  • the comminution plant according to the invention comprises a control unit which controls the production, i. H. Shredding plant that controls. To do this, the control unit uses measured values that are provided by a first and second quantity measuring unit.
  • a first quantity measuring unit for the shredded material to be screened is arranged in the material flow behind the shredder and in front of the screening unit.
  • a second quantity measuring unit for the valuable grain produced is arranged after the screening unit.
  • the desired final grain fraction after screening is referred to as value grain.
  • the measured values of the quantity measuring units are evaluated in the control unit.
  • a value fraction is determined.
  • the proportion of valuable grains is the ratio of the amount of valuable grains to the amount of material to be screened after exiting the shredder.
  • the oversize fraction can also be calculated from these measured values.
  • the amount of oversize is determined by the amount of material to be screened minus the amount of valuable grain.
  • the quotient of the amount of oversize to the amount of material to be screened is the oversize fraction.
  • the control unit is designed to determine the proportion of valuable grains and/or the proportion of oversize particles and to determine deviations from a target proportion of value grains or a target proportion of oversize particles.
  • the target value grain fraction can also be an interval in which the target value grain fraction should move. The same applies to the target oversize fraction.
  • the target value fraction is anti-proportional to the target oversize fraction.
  • the proportion of valuable particles is an important parameter for the efficiency of the process. A high proportion of valuable grains is sought.
  • the result of the calculation of the control unit (z. B. proportion of value grains, deviations from the target proportion of value grains) can be signaled to an operator on a display means.
  • the operator can take action and change operating parameters of the crusher depending on the displayed result.
  • a drop in the target particle fraction can be attributed to the circumferential speed of the shredder rotor being too low.
  • the peripheral speed can be increased.
  • the peripheral speed also decreases because the blow bars of the rotor wear out more and more. To ensure even wear, it is advisable to regularly reverse the rotor of the reversible impact crusher. This results in maximum material utilization of the blow bars and the impact mechanism.
  • the aim is to maintain a desired grading curve distribution as well as possible, regardless of the state of wear of the individual wear parts, in particular by adapting the speed of the shredder and thus the peripheral speed of the impact bars to the grading curve distribution. This can be done manually or automatically.
  • control unit not only determines the proportion of valuable grains or the deviation from the target proportion of valuable grains and displays them for manual intervention, but also influences production in terms of regulation, as explained below.
  • the quantity measuring devices are designed to determine the respective quantities volumetrically or weight-loaded.
  • the volume measuring devices are belt scales.
  • Belt scales can be integrated into mobile shredding systems in a particularly space-saving manner. They are robust and do not disturb the material flow.
  • a first quantity measuring device or belt scale is preferably arranged directly below the shredder, so that the quantity of the material to be shredded or to be screened can be precisely determined.
  • the amount of valuable grain obtained can also be determined exactly after the screening unit by means of a belt scale and can also be moved in the discharge direction via the second belt scale.
  • the shredder has a rotor with several blow bars arranged distributed over its circumference.
  • the rotor is operated at a very high rotational speed.
  • the impact bars hurl material fed into the shredder from above against impact plates of the impact mechanism in the shredder housing.
  • the smaller the gap between the impact mechanism and the rotor the higher the fines content of the crushed aggregate.
  • the grain size distribution is shifted towards smaller aggregates when the rotor speed is increased. If the speed is reduced, the result is a grain size distribution towards coarser aggregates.
  • the control unit is programmed in such a way that the speed is increased when the proportion of valuable grain decreases or the proportion of oversize grain increases.
  • the adjustment of the gap width in the impact crusher can be influenced via the controller by adjusting the impact mechanism. A shift towards smaller grain sizes can be achieved by reducing the gap width.
  • the rotor is preferably coupled to an electric drive whose speed can be adjusted by means of a frequency converter.
  • the control unit supplies control signals to the frequency converter in order to increase the speed when the proportion of valuable grains falls and/or the proportion of oversize grains increases.
  • Another aim of the invention is a production that is constant in terms of quantity.
  • the feed quantity should be able to be controlled by means of the control unit.
  • the drive of the feed unit is controlled in particular via a frequency converter, which in turn is connected to the control unit.
  • the feed quantity can be regulated by means of the frequency converter for driving the feed unit.
  • the frequency converter for driving the rotor is controlled to to achieve a desired grading curve distribution in the end product and to compensate for wear on the rotor's blow bars.
  • control unit continuously monitors the measured values or the amounts before and after the screening unit and reports deviations from the definable target values or automatically regulates the feed amount or the rotor speed in order to maintain target values.
  • the quantity produced is also kept more constant in terms of quantity by the fact that foreign bodies that cannot be crushed are ejected from the material in good time to protect the crusher. They are detected by a detection unit on a conveyor belt located between the feed unit and the shredder. After the detection of an unwanted foreign body, the control unit has the task of stopping the conveyor belt, reversing it and, including the material that is already on the conveyor belt, ejecting it from the production process and transferring it to an ejection unit. The conveyor belt can then be reversed immediately and operated in its original conveying direction. The feeding unit is stopped during discharge.
  • the method is particularly safe because the foreign body is not separated from the material on the aforementioned conveyor belt, but at a later point in time, for example in the ejection unit.
  • the ejection unit preferably has a separating device, by means of which the foreign body is separated from the ejected material. The cleaned material can be returned to the feed unit.
  • the figure 1 shows in a greatly simplified form a diagram to illustrate the material flow in a mobile crushing plant according to the invention 1.
  • the practical implementation of the principle of figure 1 is the figures 2 and 3 played back. For this reason, uniform reference symbols have been used in all figures for components that have the same functional effect.
  • the Figures 1 to 3 each show a mobile crushing plant 1 with a dosable feed unit 2 for material M to be crushed, which is fed into the feed unit 2 from above in the direction of the arrow.
  • the other arrows show the material flow.
  • the material M is a mineral primary or secondary raw material.
  • the material is to be comminuted in the mobile comminution plant 1 to give a crushed rock granulation specified in terms of grain size distribution or grading curve.
  • the material M is transferred from the feed unit 2 to a first conveyor belt 3, which transports the material M to a shredder 4, which is designed as a reversible impact crusher.
  • the crusher 4 has a housing 5 with a schematically indicated impact mechanism 6, which is arranged symmetrically due to the reversible design.
  • a rotor 7 with blow bars 8 rotates within the housing 5. It is powered by an electric Drive 9 driven. The speed of the drive 9 and thus of the rotor 7 is determined by a frequency converter 10 . A drive 11 of the feed unit 2 is controlled via a frequency converter 12 in the desired manner.
  • the material M is comminuted within the comminutor 4 and falls onto a second conveyor device 13.
  • This can in particular be a conveyor trough in the sense of a vibrating conveyor.
  • the conveyor device 13 can also be a conveyor belt.
  • the comminuted material M is then transferred to a third conveyor 15 which leads to a screening unit 16 .
  • a first quantity measuring unit 14 in the form of a belt scale.
  • the amount of crushed material M is recorded by weight.
  • the sieve unit 16 has at least one sieve deck 17. The granules falling through the sieve deck form the value fraction, which falls onto a fourth conveyor 18 and is recorded quantitatively there by a second quantity measuring device 19 in the form of a belt scale.
  • the valuable grain W is then stockpiled or transported further via conveyor belts.
  • the screen deck 17 holds back an oversized grain U, which is fed via a cross conveyor belt 20 onto a return conveyor belt 21 and is fed back into the feed unit 2 in order to be fed back into the process cycle there.
  • FIG. 1 also shows that the first conveyor belt 3 is arranged at its end on the left in the plane of the image above an indicated funnel.
  • the funnel is part of a discharge unit 22 which has a separating unit 23 .
  • the invention provides that in the first conveyor belt 3 there is a detection unit 24 for foreign bodies F which should not get into the crusher 4, eg broken excavator teeth or other metal components which cannot be crushed by the crusher. If such a foreign body F is detected, the first conveyor belt 3 is reversed and, including the material M that is on the first conveyor belt 3 together with the foreign body F at this point in time, transferred to the discharge unit 22 . There, the foreign body F is separated from the material M thus cleaned by means of the separating device 23 . The cleaned material M can be returned to the feed unit 2 again.
  • An essential component of the comminution system 1 according to the invention is a control unit 25.
  • the control unit 25 receives measured values from the first quantity measuring unit 14 and the second quantity measuring unit 19.
  • the proportion of the value grain W from the material M that has been comminuted and to be screened can be determined from the difference in the quantities. If the proportion of valuable particles falls, this can be an indication that the peripheral speed of the rotor 7 is too low. This can be attributed to progressive wear of the blow bars 8.
  • the control unit 25 can indicate or independently intervene in the production process that the speed of the rotor 7 has to be increased in order to increase the proportion of the value grain W in accordance with a predetermined setpoint value grain proportion.
  • control unit 25 The goal of the automated process control with the help of the control unit 25 is a grain size distribution that is as constant as possible in the proportion of valuable grains.
  • control unit 25 should ensure that the amount of valuable grain remains as constant as possible, regardless of the amount of oversize grain U. Therefore, the control unit 25 also controls the drive 11 of the meterable feed unit 2 via the frequency converter 12. If a higher proportion of valuable grain in the production process required, the drive 11 can increase the conveying speed in the feed unit 2. The material flow can also be reduced in the same way by reducing the speed of the drive 11 of the feed unit 2 .
  • the figure 2 shows a crushing plant 1 according to FIG figure 1 , where a number of other components are shown.
  • the crushing plant 1 is mobile on tracks and has a crawler chassis 26 which carries a frame 27 to which all of the aforementioned components of the crushing plant 1 are fastened.
  • the control unit 25 is also on the frame 27. All other components correspond to the explanations in terms of their operating principle figure 1 .
  • FIG. 1 also shows that the discharge unit 22 has a further conveyor belt 28 in order to stockpile the material M, which has been cleaned of foreign bodies F, at the side next to the crushing plant 1. Otherwise, reference is made to the above explanations.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)

Claims (11)

  1. Installation de broyage mobile (1) avec une unité d'alimentation dosable (2) pour le matériau à broyer (M), un concasseur à percussion réversible en aval en tant que broyeur (4) et avec une unité de tamisage (16) en aval du broyeur (4) dans le sens de la production pour séparer un grain de valeur (W) d'un grain grossier (U), ainsi qu'avec une unité de commande (25) commandant la production, dans laquelle une première unité de mesure de quantité (14) pour le matériau (M) à broyer et à tamiser est disposée avant l'unité de tamisage (16) et une seconde unité de mesure de quantité (19) pour mesurer la quantité du grain de valeur (W) produit est disposée après l'unité de tamisage (16), dans laquelle l'unité de commande (25) est conçue pour déterminer une part de grain de valeur et des écarts par rapport à une part de grain de valeur de consigne et/ou une part de grain grossier et des écarts par rapport à une part de grain grossier de consigne, dans laquelle la part de grain de valeur est définie comme le rapport entre la quantité de grain de valeur (W) et la quantité de matériau à tamiser (M), et dans laquelle une part de grain grossier est le rapport entre la différence des quantités de matériau à tamiser (M) et de grain de valeur (W) et la quantité de matériau à tamiser (M).
  2. Installation de broyage mobile (1) selon la revendication 1, caractérisée en ce que le premier et/ou le second dispositifs de mesure de quantité (14, 19) sont conçus pour déterminer les quantités respectives (M, W) de manière volumétrique ou pondérale.
  3. Installation de broyage mobile (1) selon la revendication 1 ou 2, caractérisée en ce que le premier et/ou le second dispositif de mesure de quantité (14, 19) est une balance à courroie.
  4. Installation de broyage mobile (1) selon l'une quelconque des revendications 1 à 3, caractérisée en ce que le broyeur (4) présente un rotor (7) avec des battoirs (8), dans laquelle la vitesse de rotation du rotor (7) peut être réglée sur des valeurs plus élevées pour compenser l'usure des battoirs (8), dans laquelle la part de grain de valeur et/ou la part de grain grossier sont des paramètres d'entrée pour la vitesse de rotation, dans laquelle l'unité de commande (25) est programmée de manière à ce que la vitesse de rotation soit augmentée lorsque la part de grain de valeur diminue et/ou la part de grain grossier augmente.
  5. Installation de broyage mobile (1) selon la revendication 4, caractérisée en ce que le rotor (7) est couplé à un entraînement électrique (9) dont la vitesse de rotation peut être réglée au moyen d'un convertisseur de fréquence (10) qui est connecté à l'unité de commande (25) pour augmenter la vitesse de rotation lorsque la part de grain de valeur diminue et/ou lorsque la part de grain grossier augmente.
  6. Installation de broyage mobile (1) selon l'une quelconque des revendications 1 à 5, caractérisée en ce qu'une quantité d'alimentation peut être réglée au moyen d'un entraînement (11) de l'unité d'alimentation (2) entraîné par un convertisseur de fréquence (12).
  7. Installation de broyage mobile (1) selon l'une quelconque des revendications 1 à 6, caractérisée en ce qu'un convoyeur de retour (21) est conçu pour renvoyer le grain grossier (U) dans l'unité d'alimentation (2).
  8. Procédé de fabrication d'un produit de grain final minéral concassé au moyen d'une installation de broyage mobile (1) avec les caractéristiques des revendications 1 à 7, caractérisé en ce que l'unité de commande (25) augmente la vitesse de rotation du rotor (7) lorsque la part de grain de valeur de consigne n'est pas atteinte et/ou lorsque la part de grain grossier de consigne est dépassée.
  9. Procédé selon la revendication 8, caractérisé en ce que l'unité de commande (25) commande la quantité d'alimentation du matériau (M) en fonction de la quantité de grain de valeur (W), dans lequel la quantité d'alimentation est augmentée lorsque la quantité de grain de valeur (W) tombe sous une valeur de consigne pouvant être prédéfinie et inversement.
  10. Procédé selon l'une quelconque des revendications 8 ou 9, caractérisé en ce que l'unité de commande (25) arrête et inverse une bande transporteuse (3) entre l'unité d'alimentation (2) et le broyeur (4) pour éjecter du processus de production un corps étranger (F) détecté sur la bande transporteuse (3), y compris le matériau (M) sur la bande transporteuse (3) et le transférer à une unité d'éjection (22).
  11. Procédé selon la revendication 10, caractérisé en ce que le corps étranger (F) est séparé du matériau (M) éjecté au moyen d'un dispositif de séparation (23) de l'unité d'éjection (22), dans lequel le matériau nettoyé (M) est renvoyé dans l'unité d'alimentation (2).
EP21182364.6A 2020-07-01 2021-06-29 Installation de concassage mobile et procédé de fabrication d'un produit final minéral en grain concassé Active EP3936234B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020003966.9A DE102020003966B4 (de) 2020-07-01 2020-07-01 Mobile Zerkleinerungsanlage und Verfahren zum Herstellen eines gebrochenen, mineralischen Endkornproduktes

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EP3936234A1 EP3936234A1 (fr) 2022-01-12
EP3936234B1 true EP3936234B1 (fr) 2022-12-14

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022118042B3 (de) 2022-07-19 2023-08-10 Kleemann Gmbh Gesteinsverarbeitungsanlage mit wenigstens zwei Wertkorn-Sieblinien und von den Sieblinienausträgen abhängiger automatisierter Betriebsführung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4544102A (en) * 1982-04-09 1985-10-01 Penn Virginia Corporation Differential rate screening
DE3911086C2 (de) 1988-10-10 1994-10-20 Gronholz Claus Prallbrecher
IT201700023345A1 (it) 2017-03-02 2018-09-02 Cams Srl Un metodo di controllo di un impianto di trattamento di elementi da riciclare o smaltire e impianto di trattamento di elementi da riciclare o smaltire
DE102017110758B4 (de) * 2017-05-17 2019-02-21 Keestrack N.V. Prallbrecher
US10730055B2 (en) * 2017-09-20 2020-08-04 Johnson Crushers International, Inc. Method of use of aggregate processing equipment

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DE102020003966A1 (de) 2022-01-05
EP3936234A1 (fr) 2022-01-12
DE102020003966B4 (de) 2022-03-24

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