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EP-4737009-A1 - JAW CRUSHER

EP4737009A1EP 4737009 A1EP4737009 A1EP 4737009A1EP-4737009-A1

Abstract

A jaw crusher (1) comprising a load bearing support frame, a first movable jaw (2) and a second movable jaw (3) forming between them a variable crushing chamber (8) having an inlet (6) and an outlet (7), and driving means for driving the fist first movable jaw (2) and the second movable jaw (3) for crushing material present in the crushing chamber (8), wherein the first movable jaw (2) is mounted eccentrically at a first rotatable shaft (4) supported on the support frame and the second movable jaw (3) is mounted eccentrically at a second rotatable shaft (5) supported on the support frame, wherein a first toggle plate (10) is coupled to a lower region of the first movable jaw (2) and a second toggle plate (11) is coupled to a lower region of the second movable jaw (3), and further the first toggle plate (10) is arranged in an up-thrust orientation and the second toggle plate (11) is arranged in a down-thrust orientation and that the first rotatable shaft (4) and the second rotatable shaft (5) are driven for counter-rotation.

Inventors

  • PRASAD, SHYAM

Assignees

  • Holcim Technology Ltd

Dates

Publication Date
20260506
Application Date
20241031

Claims (7)

  1. A jaw crusher comprising a load bearing support frame, a first movable jaw (2) and a second movable jaw (3) forming between them a variable crushing chamber (8) having an inlet (6) and an outlet (7), and driving means for driving the fist first movable jaw (2) and the second movable jaw (3) for crushing material present in the crushing chamber (8), wherein the first movable jaw (2) is mounted eccentrically at a first rotatable shaft (4) supported on the support frame and the second movable jaw (3) is mounted eccentrically at a second rotatable shaft (5) supported on the support frame, wherein a first toggle plate (10) is coupled to a lower region of the first movable jaw (2) and a second toggle plate (11) is coupled to a lower region of the second movable jaw (3), characterized in that the first toggle plate (10) is arranged in an up-thrust orientation and the second toggle plate (11) is arranged in a down-thrust orientation and that the first rotatable shaft (4) and the second rotatable shaft (5) are driven for counter-rotation.
  2. Jaw crusher according to claim 1, wherein the first toggle plate (10) extends at an angle of 20-70°, preferably 30-60°, relative to a straight line that extends through a rotation axis of the first rotatable shaft (4) and a rotation axis of the second rotatable shaft (5).
  3. Jaw crusher according to claim 1 or 2, wherein the second toggle plate (11) extends at an angle of 20-70°, preferably 30-60°, relative to a straight line that extends through a rotation axis of the first rotatable shaft (4) and a rotation axis of the second rotatable shaft (5).
  4. Jaw crusher according to claim 1, 2 or 3, wherein an orientation of first movable jaw (2) and the second movable jaw (3) relative to one another is convergent along their respective lengths such that a separation distance between a crushing face (9) of the first movable jaw (2) and a crushing face (9) of the second movable jaw (3) decreases in a direction from the inlet (6) of the crushing chamber (8) to the outlet (7) of the crushing chamber (8).
  5. Jaw crusher according to anyone of claims 1 to 4, wherein a conveyor belt (15) is arranged at an adjustable distance below the outlet (7) of the crushing chamber (8).
  6. Jaw crusher according to anyone of claims 1 to 5, wherein the second toggle plate (11) has a length that is at least 50% larger than the length of the first toggle plate (10).
  7. Use of a jaw crusher according to any one of claims 1 to 6 for crushing concrete demolition waste by subjecting the concrete demolition waste to attrition and abrasion in the crushing chamber, thereby separating a cement paste component of the concrete demolition waste from an aggregate component.

Description

The invention refers to a jaw crusher comprising a load bearing support frame, a first movable jaw and a second movable jaw forming between them a variable crushing chamber having an inlet and an outlet, and driving means for driving the fist first movable jaw and the second movable jaw for crushing material present in the crushing chamber, wherein the first movable jaw is mounted eccentrically at a first rotatable shaft supported on the support frame and the second movable jaw is mounted eccentrically at a second rotatable shaft supported on the support frame, wherein a first toggle plate is coupled to a lower region of the first movable jaw and a second toggle plate is coupled to a lower region of the second movable jaw. Most jaw-type crushers usually have a fixed jaw and a large heavy movable jaw known as a pitman which is driven by an eccentric shaft which causes the pitman to move along a non-circular path. In other embodiments, jaw crushers have become known that comprise two movable jaws. Typically, the bottom of the movable jaw(s) is supported by a toggle plate, which serves the purpose of allowing, within limits, the bottom of the movable jaw(s) to move up and down with the motion of the eccentric shaft, i.e. the toggle plate supports the lower part of the movable jaw and helps in the transmission of the oscillating motion from the eccentric shaft to the jaw. Further, by adjusting the position of the toggle plate, the size of the discharge opening may be changed, thereby allowing the size of the crushed output to be varied. Jaw crushers are versatile machines used for crushing a wide range of materials. They are commonly employed in the mining and construction industries. The typical materials processed through jaw crushers include ores, minerals, rocks, gravel, and demolition debris. In construction and demolition, jaw crushers play a crucial role in handling rubble and concrete debris. They are used to crush these materials into smaller pieces for recycling or disposal. Similarly, in the production of aggregates for construction, jaw crushers are used to break down rocks and gravel into finer particles. Jaw crushers can handle a wide range of material hardness, from soft to very hard, making them suitable for a diverse range of applications. However, the specific design and capacity of the jaw crusher determine the size and type of material it can effectively process. In recent years, there has been a gradual increase in the recycling of construction demolition waste for reuse in the production of cement or concrete mixes. In an effort to reduce the use of virgin materials in the production of cement and concrete, the construction materials industry has developed several solutions that attempt to maximise the substitution of Portland clinker in cement mixes or the substitution of limestone and clay in clinker raw meal mixes. Incorporating construction demolition wastes in cement production can significantly reduce CO2 emissions associated with the cement manufacturing process. This is achieved through reduced limestone calcination, as well as the use of an industrial by-product, which would otherwise require disposal or long-term storage. Construction demolition wastes are a mixture of different materials that come from the demolition site of an old construction. It is typically composed of concrete demolition wastes, plasterboards, bricks, steel, wood, tiles or glass. The common practice is to sort these materials in recycling centres, so as to separate the materials listed above to re-use them in applications for which their chemical composition is most suitable. These demolition wastes are classified under different waste codes of the European Waste Catalogue (EWC) depending on its composition and potential contamination. The EWC is a hierarchical list of waste descriptions established by EU Commission decision 2000/532/EC2. Construction and demolition wastes fall under chapter 17 of the EWC. Concrete demolition wastes fall under sub-chapter 17 01 und comprises the following waste codes: 17 01 01: concrete17 01 02: bricks17 01 03: tiles and ceramics17 01 06: mixtures of, or separate fractions of concrete, bricks, tiles and ceramics containing hazardous substances17 01 07: mixtures of concrete, bricks, tiles and ceramics other than those mentioned in 17 01 06 Other sub-chapters comprise wood, glass and plastic (17 02), bituminous mixtures, coal tar and tarred products (17 03), metals (17 04), soil (17 05), and other fractions (17 06 - 17 09) . For the purpose of the instant invention, concrete demolition waste according to EWC waste code 17 01, in particular 17 01 01 and/or 17 01 07, may be used. The products obtained from the crushing of concrete demolition waste are mainly crushed aggregates and cement paste. Crushed aggregates can be used in new construction projects. These aggregates can be used as a substitute for natural aggregates in concrete production, road construction and landscaping