Conventionally, a jaw crusher that crushes raw materials by swinging a swing jaw with respect to a fixed jaw is known. The fixed jaw and the swing jaw are supported by a crusher frame. Raw materials are thrown into a region surrounded by thefixed jaw, the swing jaw and the crusher frame, and then the swing jaw swings to crush the raw materials between the fixed jaw and the swing jaw.
Such a jaw crusher is arranged to receive reaction force from crushing of raw materials with a reaction force-receiving link mechanism. The reaction force-receiving mechanism substantially includes, for example, a link plate whose first end isengaged to a rear surface of the swing jaw, a toggle link that supports a second end of the link plate and rotates about a fixed link pin, and a lock cylinder whose lower end is connected to the toggle link (e.g., see Patent Document 1).
In the reaction force-receiving link mechanism, a rotational axis of the toggle link is a dual type toggle link pin, a pair of which are serially disposed along the width direction of the jaw crusher. An outer (first) end of each toggle link pinis supported by a side wall plate constituting a side surface of a crusher frame, and an inner (second) end is supported by a plate-shaped bracket standing on a cross member which connects the side wall plates on both sides. Since the first end of eachtoggle link pin is supported by the side wall plate, the toggle link pin can be pulled out from the side wall plate to the exterior, thereby facilitating maintenance.
Taking maintenanceability into consideration, the outer end of the toggle link pin is supported by the side wall plate, which happens to be provided with high strength as a portion of the crusher frame, so that the end can be supported withadvantageous strength.
However, though a support structure can rigidly support the first end of the toggle link pin, since the inner second end is supported only by the plate-shaped bracket, the outer side and the inner side are not well-balanced with respect tostrength, thereby requiring a thicker bracket for compensation, which is unsuitable for a compact jaw crusher that requires weight reduction.
An object of the present invention is to provide a jaw crusher which can keep maintenanceability by facilitating attachment and detachment of the toggle link pin and can support, in good balance, the outer side and inner side of the toggle linkpin and a self-propelled crushing machine having such a jaw crusher.
A jaw crusher according to an aspect of the present invention includes: a crusher frame that includes a pair of side wall plates and a rear wall plate and a cross member that connect the pair of the side wall plates; a fixed jaw attached to therear wall plate; a swing jaw swingably hung between the side wall plates; and a reaction force-receiving link mechanism that includes: (i) a pair of toggle link pins having a first end pivoted on the side wall plate and a second end pivoted on a mainsupporter provided to the cross member, the pair of the toggle link pins being coaxial y disposed, (ii) and (ii) a toggle link rotatably supported by the toggle link pins, in which the cross member on which the second end of the toggle link pin ispivoted is box-shaped.
In the above arrangement, it is preferable that the reaction force-receiving link mechanism includes a pair of lock cylinders whose pistons have a distal end that is rotatably coupled to the toggle link by way of a coupling shaft, the mainsupporter is provided to a side of the cross member adjacent to the swing jaw, and supporting portions that support cylinder bodies of the pair of the lock cylinders are provided to a side of the cross member opposite to the side to which the mainsupporter is provided.
In the above arrangement, it is preferable that the reaction force-receiving link mechanism includes a link plate having an end engaged to a rear portion of the swing jaw, and that a biasing mechanism that biases the link plate in a predetermineddirection is provided to an outer side of the toggle link.
In the above arrangement, it is preferable that the reaction force-receiving link mechanism includes a pair of arms that supports the other end of the link plate and is rotatably supported by the pair of the toggle link pins, in which a couplingcenter of the lock cylinder relative to the coupling shaft is displaced axially inward with respect to a support center of the arm relative to the toggle link pin, and the biasing mechanism is disposed in a space created by the displacement between theside wall plates and the toggle link.
According to the aspect of the present invention as mentioned above, the outer end of the pair of the toggle link pins that support the toggle link is securely pivoted on the side plate, and the inner end is also securely pivoted not on aconventional plate-like bracket of a cross member but on the highly rigid, box-shaped main supporter integrally provided to the cross member, so that both ends of the toggle link pin can be supported well-balanced in strength without additionalreinforcement, thereby enabling weight reduction. Obviously, since the outer end of each of the toggle link pins is supported by the side wall plate, the toggle link pin can be pulled out from the side wall to the exterior by removing the toggle linkpin from the side wall plate, thereby still allowing easy maintenance.
According to the aspect of the present invention, as described above, since the cross member is formed box-shaped and high in rigidity, the cross member can serve as a supporting portion for the lock cylinders, so that there is no need foradditional components to support the lock cylinders, thereby reducing the number of components constituting the jaw crusher.
According to the aspect of the present invention, since the biasing mechanisms are provided to the outer sides of the toggle link, the biasing mechanisms can be adjusted from the exterior of the jaw crusher, thereby facilitating adjustment.
According to the aspect of the present invention, the coupling center of the lock cylinder at the coupling shaft and the support center of the toggle link pin on the toggle link are misaligned to provide a space to dispose the biasing mechanism,so that the biasing mechanisms can be efficiently disposed to both sides of the toggle link, thereby providing secure support to the link plate.
According to the aspect of the present invention, functions and effects similar to the above-mentioned aspects of the invention can be obtained by installation of the jaw crusher according to the above-mentioned aspects of the present invention.
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