WO2013171361A1

WO2013171361A1 - Jaw crusher, crushing plant and crushing method

Info

Publication number: WO2013171361A1
Application number: PCT/FI2012/050464
Authority: WO
Inventors: Keijo Viilo
Original assignee: Metso Minerals Oy
Current assignee: Metso Finland Oy
Priority date: 2012-05-15
Filing date: 2012-05-15
Publication date: 2013-11-21
Anticipated expiration: 2014-11-15

Description

JAW CRUSHER, CRUSHING PLANT AND CRUSHING METHOD

TECHNICAL FIELD The invention relates to a jaw crusher and a processing plant and a crushing method which are suitable for mineral material crushing.

BACKGROUND ART The function of a jaw crusher is based on a force which is compressing the rock. An eccentric shaft is attached to a body of the jaw crusher to which eccentric shaft is connected a movable jaw, i.e. a pitman, making an eccentric movement relative to a fixed jaw. For moving the pitman of the jaw crusher two main types are known in which two toggle plates, a so called double toggle, or one toggle plate, a so called single toggle, are used in the movement mechanism of the pitman.

In the double toggle type jaw crusher the eccentric shaft is connected between two toggle plates to move one end of the pitman (for example, a bottom end in a Blake-crusher) and a second end of the pitman is pivoted to the body of the crusher. In a double toggle crusher of a so called overhead pivot-type the pivot in the upper end of the pitman is located on a bisector of the crushing chamber wherein a stroke is formed in the upper portion of the crushing chamber which is larger than the stroke in the conventional Blake-crusher, and the stroke is in a more perpendicular direction relative to the fixed jaw. The stroke has a form of a large arc.

The single toggle type crusher is simpler than the double toggle type crusher. In the single toggle crusher one end of the pitman is pivoted through the eccentric shaft to the body of the crusher and the second end of the pitman is pivoted to the body of the crusher through the toggle plate. When the upper end of the pitman is pivoted by the eccentric shaft (a crusher of overhead eccentric type), a movement shape of the movable jaw is almost a circle in the upper portion of the crushing chamber because it is near the eccentric shaft. Then the stroke in the bottom portion of the crushing chamber has a form of a narrow ellipse and the movement shape is getting upwards more and more a form of a circle in the crushing chamber. In the single toggle crushers the powerful stroke in the upper and centre portions of the crushing chamber is problematically short because of the form of the movement shape. A large part of the compression movement is directed inclined upwards or downwards. The amount of crushing strokes for breaking a single stone is high because of the short stroke what is limiting capacity and is leading to pulverizing of the surface of the material to be crushed before the actual crushing. Fine material is not interesting economically and generating of the fine material is causing unnecessary energy consumption. The direction of the stroke is not optimal in the bottom portion of the crushing chamber but is directed upwards wherein the material to be crushed is moving vertically on the wear surfaces. Large stones which require a long crushing distance are crushed in the upper portion of the crushing chamber. The stroke length in the upper portion of the known crusher is small relative to the stone size. Because the stroke is short in the upper portion of the crushing chamber of the crusher, many strokes are required before large stones are broken. The unfavorable stroke direction is wearing the jaws more than a stroke which is perpendicular to the bisector of the crushing chamber.

In the double toggle crushers the shape and direction of the stroke are better than in the single toggle crushers. On the other side the stroke is much smaller in the upper portion than in the lower portion of the crushing chamber and so the upper portion of the crushing chamber becomes easy the part which is limiting the capacity.

When the jaws are wearing the jaw angle is increasing and may in some applications drop the capacity of the crusher substantially smaller.

An object of the invention is to create an alternative crusher by which drawbacks present in connection with known crushers can be eliminated or at least reduced. SUMMARY

According to a first example aspect of the invention there is provided a jaw crusher comprising a body to which are arranged a fixed jaw and a pitman which is movable against the movable jaw for forming a crushing chamber which is open at the top; and the pitman is bearing-mounted to an eccentric shaft which is bearing- mounted rotatably to the body forming so a first pivot point and the pitman is bearing-mounted to the eccentric shaft at an eccentric point of the eccentric shaft forming so a second pivot point; and the pitman is supported to the body by a pivot bar which is pivoted at a first end of the pivot bar to the pitman forming so a third pivot point and at a second end of the pivot bar to the body forming so a fourth pivot point; and the at least one pivot bar which is pivoted to the pitman is arranged such that a plane passing through the third pivot point and the fourth pivot point (or the third and the fourth pivot points) is arranged substantially parallel (± 20°) with a bisector of the crushing chamber.

Preferably the first pivot point is located vertically substantially on the same height with the third pivot point of the at least one pivot bar which is pivoted to the pitman or in place of the crushing chamber.

Preferably the plane which is passing through the first pivot point and the third pivot points is substantially perpendicular (± 20°) to the bisector of the crushing chamber.

Preferably the plane which is passing through the first pivot point and the third pivot points is in an angle of 90°± 20° relative to the bisector of the crushing chamber. Preferably the first pivot point and the third pivot point are located vertically substantially on the height of the vertical centre point of the crushing chamber.

Preferably the pivot bar is arranged substantially in a vertical position such that the fourth pivot point between the pivot bar and the body is arranged vertically substantially below or above the third pivot point.

Preferably the third pivot point is arranged near a wear part which is arranged to the pitman during use. Preferably the third pivot point is arranged behind the wear part or at the side or in front of the wear part which is arranged to the pitman during use, preferably on the bisector of the crushing chamber.

Preferably the crusher comprises adjusting apparatuses of setting and jaw angle which are located in an upper end and a lower end of the fixed jaw.

Preferably a movement mechanism of the jaw crusher, is corresponding to a four- bar linkage. Preferably the body is corresponding to a frame of the four-bar linkage. Preferably the pitman is corresponding to a coupler of the four-bar linkage. Preferably the eccentric shaft is corresponding to a crank of the four-bar linkage. Preferably the pivot bar is corresponding to a rocker of the four-bar linkage.

Preferably the rotation axis of the eccentric shaft relative to the body is corresponding to the first pivot point of the four-bar linkage. Preferably the rotation axis of the eccentric part of the eccentric shaft relative to the pitman is corresponding to the second pivot point of the four-bar linkage. Preferably the pivot formed between the first end of the pivot bar and the pitman is corresponding to the third pivot point of the four-bar linkage. Preferably the pivot formed between the second end of the pivot bar and the body is corresponding to the fourth pivot point of the four-bar linkage.

Preferably the jaw crusher comprises a flywheel which is fixed to a centre region of the eccentric shaft.

According to a second example aspect of the invention there is provided a crushing plant which comprises a jaw crusher according to any embodiment of the invention. According to a third example aspect of the invention there is provided a method for mineral material crushing in a jaw crusher or a crushing plant which jaw crusher or crushing plant comprises a body to which are arranged a fixed jaw and a pitman which is moved against the movable jaw for forming a crushing chamber which is open at the top; and the pitman is bearing-mounted to an eccentric shaft which is bearing-mounted rotatably to the body forming so a first pivot point and the pitman is bearing-mounted to the eccentric shaft at an eccentric point of the eccentric shaft forming so a second pivot point; and the pitman is supported to the body by a pivot bar which is pivoted at a first end of the pivot bar to the pitman forming so a third pivot point and at a second end of the pivot bar to the body forming so a fourth pivot point; and the method comprising directing a crushing stroke to the material to be crushed in a direction which is substantially perpendicular to the bisector of the crushing chamber by a movement mechanism of the jaw crusher in which the said at least one pivot bar which is pivoted to the pitman is arranged such that a plane passing through the third pivot point and the fourth pivot point (or the third and the fourth pivot points) is arranged substantially parallel (± 20°) with the bisector of the crushing chamber. Preferably the setting and the jaw angle of the jaw crusher are adjusted by adjustment apparatuses which are located in an upper end and a lower end of the fixed jaw. Preferably the adjustment apparatuses are located between the body (a front end) of the jaw crusher and wear parts of the fixed jaw. Preferably overload protecting devices are integrated in the adjustment apparatuses.

Preferably the bisector of the crushing chamber is the bisector of the smaller angle between crushing surfaces of the fixed and movable jaws at a designed minimum closed side setting of the crusher. The power used by the jaw crusher per crushed amount of mineral material can be smaller than in known applications because lesser energy is used in the crushing event for moving vertically the material to be crushed between the jaws. A larger crushing volume can be gained by the same crushing power because a larger portion of the power can be directed to crushing of the mineral material.

The movement mechanism enables an optimal stroke in a direction perpendicular to the bisector of the crushing chamber. At the same time the stroke is almost constant in the region of the whole crushing chamber and so also a sufficient stroke is gained to the upper and centre portions of the crushing chamber. In the upper portion of the crushing chamber the stroke is increasing compared to the double toggle-type crushers and crushing probability of large blocks is increasing. Then, lesser work cycles are required and the capacity of the upper portion of the crushing chamber is increasing. The whole crushing chamber can work more evenly in practice. Wearing of the jaws is lesser than in conventional crushers because the stroke is almost perpendicular to the bisector of the crushing chamber. By the adjustment of the fixed jaw in the upper and/or lower portion it is possible, in addition to the adjustment of the setting, to change if desired also the jaw angle without additional parts. At the same time the jaw angle can be held constant during the total lifetime of the jaws. The jaw angle can be adjusted convenient for each rock material.

Location of the fly wheels substantially lower than in the prior art is reducing the total height of the crusher and the crushing plant. According to some embodiments it is possible to use one flywheel and to locate the flywheel at the centre region of the eccentric shaft inside the body. This embodiment is reducing the width of the crusher. A more compact crusher enables feeding also from the side of the movable jaw "against the fixed jaw". This situation is more advantageous than against the movable jaw wherein a large stone against the movable jaw may cause large forces to the structures of the crusher.

A more optimal movement shape is reducing wear of the crusher and the wear parts, increasing capacity and reducing energy consumption.

The more compact size of the crusher is enabling greater flexibility than before in the design of the crushing plant (a more compact plant). Different embodiments of the present invention will be illustrated or have been illustrated only in connection with some aspects of the invention. A skilled person appreciates that any embodiment of an aspect of the invention may apply to the same aspect of the invention and other aspects alone or in combination with other embodiments as well.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described, by way of example, with reference to the accompanying schematical drawings, in which:

Fig. 1 shows a side view of a crushing plant which is suitable for mineral material crushing;

Fig. 2 shows a side view of a movement mechanism according to a preferable embodiment of the invention;

Fig. 3 shows a side view of a movement mechanism according to a second preferable embodiment of the invention;

Fig. 4 shows a jaw crusher having a movement mechanism according to Fig. 2; and

Fig. 5 shows a jaw crusher having a movement mechanism according to Fig. 2 and in which a third pivot point is arranged at a bisector of a crushing chamber.

DETAILED DESCRIPTION In the following description, like numbers denote like elements. It should be appreciated that the illustrated drawings are not entirely in scale, and that the drawings mainly serve the purpose of illustrating some example embodiments of the invention. Fig. 1 shows a mineral material processing apparatus, a crushing plant 200 which comprises a jaw crusher 100. The crushing plant 200 has a feeder 103 for feeding the material to the jaw crusher 100 and a belt conveyor 106 for transporting the crushed material farther from the crushing plant. The belt conveyor 106 shown in Fig. 1 comprises a belt 107 which is adapted to pass around at least one roller 108. The crushing plant 200 comprises also a power source and a control unit 105. The power source can be for example a diesel or an electric motor which is providing energy for process units and hydraulic circuits.

The feeder 103, the crusher 100, the power source 105 and the conveyor 106 are attached to a body 101 of the crushing plant which body in this embodiment comprises additionally a track base 102 for moving the crushing plant 200. The crushing plant can also be wholly or partly wheel based or movable on legs. Alternatively it can be movable/towable for example by a truck or another external power source. The mineral material may be for example mined rock or it may be asphalt or construction demolition waste such as concrete or bricks etc. In addition to the above the crushing plant may also be a fixed plant.

Embodiments of the jaw crusher 100 shown in Figs. 2 to 5 can be used for example in the crushing plant 200 of Fig. 1.

The jaw crusher 100 shown in Fig. 1 comprises a movement mechanism which is based on a four-bar linkage. The four-bar linkage consist of four rigid links which are attached to each other by joints or pivots to form a closed loop: a frame which does not move; a crank to which an external force is brought to move the movement mechanism; a coupler, and a rocker. The crank and the rocker are pivoted directly to the frame and the coupler is pivoted via the crank and the rocker to the frame. The jaw crusher 100 comprises a body 2 which is corresponding to the frame of the four-bar linkage and is the link which does not move. To the body are arranged a fixed jaw 3 and a movable jaw i.e. a pitman 4 which is movable towards the fixed jaw. Wear surfaces 3' of wear parts arranged to the fixed jaw and wear surfaces 5' of wear parts 5 arranged to the pitman 4 are forming there between a crushing chamber 6 which is open at the top. The fixed wear surface 3' and the movable wear surface 5' are defining there between a bisector 6' of the crushing chamber 6 which is almost vertical in Figs. 2 and 3. The bisector 6' of the crushing chamber is not necessary parallel with the gravitation force. Accordingly, it may be inclined such as in Fig. 2. Centre points of the wear surface 3' of the wear part arranged to the fixed jaw, and of the wear surface 5' of the wear part arranged to the pitman are defining a vertical centre point of the crushing chamber 6. The vertical centre point of the crushing chamber is located in a facing point of the two-part wear parts 3, 5 in Figs. 2 and 3.

The pitman 4 is bearing-mounted to the body 2 at a first support point by an eccentric shaft 7 which is bearing-mounted rotatably to the body. The eccentric shaft 7 is corresponding to the crank of the four-bar linkage. The pitman 4 is corresponding to the coupler of the four-bar linkage. A rotation axis of a first bearing between the eccentric shaft 7 and the body 2 is corresponding to a first pivot point 8 of the movement mechanism.

The eccentricity of the eccentric shaft 7 is defining a functional length of the crank, that is a distance between first and second support points. A rotation axis of a second bearing between an eccentric point of the eccentric shaft and the pitman 4 is corresponding to a second pivot point 9 of the movement mechanism. A circular movement path of the second pivot point 9 relative to the first pivot point 8 is denoted with a circle 10.

The pitman 4 is additionally supported to the body 2 at a second support point by at least one pivot bar 11 which is corresponding to the rocker of the four-bar linkage. Both ends of the pivot bar comprises a pivot. A third pivot point 12 of the movement mechanism is between the first end of the pivot bar 11 and the pitman 4. A fourth pivot point 13 of the movement mechanism is between the second end of the pivot bar 11 and the body 2. The portion of the coupler between the second pivot point 9 and the third pivot point 12 belonging to the movement mechanism is demonstrated by referral number 4'. The jaw crusher 100 comprises a movement mechanism in which the eccentric shaft 7 is supported to the body 2 behind the wear parts 5 of the pitman 4 and vertically substantially on the height of the centre point of the wear surface of the pitman. The pivot bar 11 of the movement mechanism is preferably substantially vertical and it may be supported to the body 2 of the jaw crusher either from below or from above (a bottom support is shown in Figs. 2 and 4 and an upper support is shown in Fig. 3). The pivot bar 1 may receive both compression and tension in different load situations depending on locations of the third 12 and the fourth 13 pivot points. The third pivot point 12 at the pitman side is preferably located horizontally as close as possible the wear surface 5' of the wear parts 5 of the pitman wherein a very short vertical movement can be gained for the movable jaw. The decreasing vertical movement of the wear surface of the pitman relative to the fixed jaw 3 is reducing the power required from the crusher when the material to be crushed must not be abraded vertically between the jaws.

The closer the third pivot point 12 is brought to the wear surface 5' of the jaw, more preferably to the bisector 6' of the crushing chamber, the closer to the wear surface can also the eccentric shaft 7 be brought and the crusher can be shortened. The crusher can be lowered and a compact crusher can be generated when the eccentric shaft and the flywheel connected to it can be brought lower than in the typical single toggle crusher.

In mineral material crushing the opening of the crushing chamber must in practice have a certain size for example for feeding stones to the crushing chamber. By the jaw angle adjustment of the crushing chamber the efficient crushing can be affected such that the material to be crushed is kept in place and does not move upwards on the surfaces of the wear parts which are fixed to the fixed jaw and to the pitman. The pitman can be moved substantially perpendicularly relative to the bisector of the crushing chamber when there is crushed with crushers according to preferable embodiments of the invention wherein the jaw angle can in some cases be increased compared to prior art. Then, the crusher can also be lowered if necessary. The setting and the jaw angle of the jaw crusher can be adjusted by adjusting apparatuses 14' and 15' which are located in the upper end 14 and the lower end 15 of the fixed jaw 3. Preferably overload protecting devices are integrated in these adjustment apparatuses.

The fourth pivot point 13 is located preferably such that the direction of the stroke is perpendicular to the bisector of the crushing chamber. Then a plane passing through the pivot points 12, 13 of the pivot bars is perpendicular to a plane which is passing through the first pivot point 8 and third pivot point 13.

The pivot bar 11 is preferably enough long such that the movement of the movable jaw is sufficient linear. The location of the eccentric shaft can somewhat be moved vertically and the optimal stroke direction can nevertheless be maintained by the locations of the pivot points 12 and 13.

According to an example embodiment the width of the crushing chamber 6 of the jaw crusher 100 is 1100 mm wherein a functional length of the substantially vertical pivot bar 11 of the movement mechanism of the jaw crusher between the third and the fourth pivot point is 600 mm and the eccentric shaft 7 is located at a distance 4' of 2000 mm from the third pivot point 12 in the upper end of the pivot bar 11. The eccentricity 7' of the eccentric shaft 7 is 20 mm wherein the stroke is about 40 mm. The movement path of the moving wear surface 5' in the upper portion 31 , in the centre 32 and in the lower portion 33 of the crushing chamber is shown with dashed lines in Fig. 2. The movement mechanism of the movable jaw enables an optimal stroke in a direction perpendicular to the bisector of the crushing chamber. The stroke is almost constant in the region of the whole crushing chamber.

The movement mechanism of the jaw crusher 100 shown in Fig. 3 corresponds to the movement mechanism in Fig. 2, but the location of the fourth pivot point 13 in the body 2 is moved above the second pivot point 12. The pivot bar 11 is so arranged in an inverted position compared to Fig. 2.

Fig. 4 shows a top view of a cross section of the jaw crusher 100 along a plane which is passing through the rotation axis 8 of the eccentric shaft and the third pivot point 12 of the movement mechanism. In the front end 16 of the crusher, side plates belonging to the body 2 of the jaw crusher 100 are connencted to each other by the fixed jaw of the crusher to which is/are attached a wear part(s) 3. The eccentric shaft 7 is fixed to the body on the height of the vertical centre point of the wear surfaces 5' of the pitman 4 and horizontally behind the wear surfaces 5'. Flywheels 17 are fixed to both ends of the eccentric shaft.

The pitman 4 is supported at a first support point to the body 2 by the eccentric shaft 7 which is bearing-mounted rotatably to the body. The first rotation axis 8 of the first bearing between the eccentric shaft 7 and the body 2 is corresponding to the first pivot point of the movement mechanism. The second rotation axis 9 of the second bearing between the eccentric part of the eccentric shaft 7 and the pitman 4 is corresponding to the second pivot point of the movement mechanism. The distance from the first rotation axis 8 to the second rotation axis 9 is denoted with the reference number 7'.

The pitman 4 is supported to the body 2 at the second support point by two pivot bars 11. The pivot bars 11 are fixed at holes 18 in the first ends (upper ends) of the pivot bars to a first shaft 22 which is fixed to the pitman at the location of the third pivot point 12. The first shaft is fixed to the pitman and is extending to the sides of the pitman inside the side plates of the body. The pivot bars 11 are fixed at holes 19 in the second ends (lower ends) of the pivot bars to a second shaft 23 which is fixed to the pitman at the location of the fourth pivot point 13. The second shaft 23 is supported to the side plates of the body 2 preferably below the pitman. The pivot bars 11 are preferably arranged between the pitman and the side plates of the body inside the body. A separate pivot bar 11 is shown in Fig. 4 on the right hand side of the jaw crusher 100. Naturally the first and the second shafts can be formed divided such that the first shaft does not penetrate the pitman and the second shaft does not connect the side plates of the body. Fig. 5 shows a top view of a cross section of the jaw crusher 100 along a plane which is passing through the rotation axis 8 of the eccentric shaft and the third pivot point 12 of the movement mechanism. As a difference compared to Fig. 4 is that at the location of the crushing chamber of the jaw crusher 100 the side plates 32 are integrated to the pitman at the side of the pitman, and the wear part(s) of the fixed jaw of the front end 16 of the crusher is/are between the side plates 32. Here the side plates do not belong to the fixed body 2. The movement mechanism is according to Fig. 2 such that the third pivot point 12 is arranged at the bisector 6' of the crushing chamber. The side plates 32 are preferably formed of a undivided material with the pitman for example casted. It is also possible to form the side plates as a rigid piece with the pitman by welding or bolting.

As short as possible vertical movement for the movable jaw can be achieved by the jaw crusher of Fig. 5 because the pivot bar has an optimal location on the bisector of the crushing chamber. The shafts of the pivots 12 and 13 do not extend through the crushing chamber in Fig. 5 but short shafts are arranged at both sides of the crusher. The decreasing vertical movement of the wear surface 5' of the pitman relative to the fixed jaw 3 is reducing the power which is required from the crusher when the material to be crushed must not be abraded vertically between the jaws. Naturally the body 2 of the jaw crusher and the pitman 4 with the side walls 32 are designed curved (no sharp discontinuities) for receiving stresses due to forces. According to some embodiments one flywheel is arranged to the jaw crusher at the centre point of the eccentric shaft 7, preferably inside the body 2. A recess 20 for the flywheel and one flywheel placed in the recess are shown by a dashed line wherein flywheels 17' external to the body 2 are not necessary required. The foregoing description provides non-limiting examples of some embodiments of the invention. It is clear to a person skilled in the art that the invention is not restricted to details presented, but that the invention can be implemented in other equivalent means. Some of the features of the above-disclosed embodiments may be used to advantage without the use of other features. As such, the foregoing description shall be considered as merely illustrative of principles of the invention, and not in limitation thereof. Hence, the scope of the invention is only restricted by the appended patent claims.

Claims

PATENT CLAIMS . A jaw crusher ( 00) comprising a body (2) to which are arranged a fixed jaw (3) and a pitman (4) which is movable against the movable jaw for forming a crushing chamber (6) which is open at the top; and the pitman is bearing-mounted to an eccentric shaft (7) which is bearing-mounted rotatably to the body forming so a first pivot point (8), and the pitman is bearing-mounted to the eccentric shaft at an eccentric point of the eccentric shaft forming so a second pivot point (9); and the pitman is supported to the body by a pivot bar (11) which is pivoted at a first end of the pivot bar to the pitman forming so a third pivot point (12) and at a second end of the pivot bar to the body forming so a fourth pivot point (13), characterized in that the at least one pivot bar (11) which is pivoted to the pitman is arranged such that a plane passing through the third pivot point (12) and the fourth pivot point (13) is arranged substantially parallel with a bisector of the crushing chamber.

2. The jaw crusher according to claim 1 , characterized in that the first pivot point (8) is located vertically substantially on the same height with the third pivot point (12) of the at least one pivot bar (11) which is pivoted to the pitman.

3. The jaw crusher according to claim 1 or 2, characterized in that the plane which is passing through the first pivot point (8) and the third pivot points (12) is substantially perpendicular to the bisector (6') of the crushing chamber.

4. The jaw crusher according to any of claims 1 to 3, characterized in that the first pivot point (8) and the third pivot point (12) are located vertically substantially on the height of the vertical centre point of the crushing chamber (6).

5. The jaw crusher according to any of claims 1 to 4, characterized in that the pivot (11) bar is arranged substantially in a vertical position such that the fourth pivot point (13) is arranged vertically substantially below or above the third pivot point (12).

6. The jaw crusher according to any of claims 1 to 5, characterized in that the third pivot point (12) is arranged behind the wear part (5) which is arranged to the pitman during use.

7. The jaw crusher according to any of claims 1 to 5, characterized in that the third pivot point (12) is arranged at the side or in front the wear part (5) which is arranged to the pitman during use, preferably on the bisector (6') of the crushing chamber.

8. The jaw crusher according to any of claims 1 to 7, characterized in that the crusher comprises adjusting apparatuses (14') and (15') of setting and jaw angle which are located in an upper end (14) and a lower end (15) of the fixed jaw (3).

9. The jaw crusher according to any of claims 1 to 8, characterized in that the jaw crusher (100) comprises a flywheel (17') which is fixed to a centre region of the eccentric shaft (7).

10. The jaw crusher according to any of claims 1 to 9, characterized in that the plane which is passing through the first pivot point (8) and the third pivot points

(12) is in an angle of 90°± 20° relative to the bisector of the crushing chamber.

11. A crushing plant (200), characterized in that the crushing plant (200) comprises a jaw crusher (100) according to any of claims 1 to 10.

12. A method for mineral material crushing in a jaw crusher (100) or a crushing plant (200) which jaw crusher or crushing plant comprises a body (2) to which are arranged a fixed jaw (3) and a pitman (4) which is moved against the movable jaw for forming a crushing chamber (6) which is open at the top; and the pitman is bearing-mounted to an eccentric shaft (7) which is bearing-mounted rotatably to the body forming so a first pivot point (8), and the pitman is bearing-mounted to the eccentric shaft at an eccentric point of the eccentric shaft forming so a second pivot point (9); and the pitman is supported to the body by a pivot bar (11) which is pivoted at a first end of the pivot bar to the pitman forming so a third pivot point (12) and at a second end of the pivot bar to the body forming so a fourth pivot point (13), characterized by directing a crushing stroke to the material to be crushed in a direction which is substantially perpendicular to the bisector (6') of the crushing chamber (6) by a movement mechanism of the jaw crusher in which the said at least one pivot bar (11) which is pivoted to the pitman is arranged such that a plane passing through the third pivot point and the fourth pivot point (13) is arranged substantially parallel with the bisector of the crushing chamber,

13. The method according to claim 12, characterized in that the first pivot point (8) is located vertically substantially on the same height with the third pivot point (12) of the at least one pivot bar (11) which is pivoted to the pitman.

14. The method according to claim 12 or 13, characterized in that the plane which is passing through the first pivot point (8) and the third pivot points (12) is substantially perpendicular to the bisector of the crushing chamber.

15. The method according to any of claims 12 to 14, characterized by adjusting the setting and the jaw angle of the jaw crusher (100) by adjustment apparatuses (14') and (15') which are located in an upper end (14) and a lower end (15) of the fixed jaw (3).