In this jaw crusher, the lower side of the swing jaw is supported by a reaction force receiver mechanism including a toggle plate and a toggle block. A most widely used type of reaction force receiver mechanism is a down-thrust type in which thetoggle plate contacts the back of the swing jaw obliquely from upside toward downside. According to this down-thrust type, the swing jaw swings upward from downside when the swing jaw moves near to the fixed jaw.
If a reaction force receiver mechanism having a toggle plate is used, the toggle plate is merely clamped between the toggle block and the swing jaw. This kind of jaw crusher therefore is provided with a toggle plate holder mechanism, whichprevents release of the swing jaw from its engagement with the toggle plate while the swing jaw is swinging. The toggle plate holder mechanism has a tension rod whose one end is set on the swing jaw. The tension rod is positioned along the toggleplate. The other end of the tension rod is biased by a tension spring. The biasing force of the tension spring biases the swing jaw to the toggle block side, to clamp the toggle plate.
In the reaction force receiver mechanism of the down-thrust type, the swing jaw moves upward from downside near to the fixed jaw, pressing the fixed jaw. At this time, however, the angle at which the swing jaw moves near to the fixed jaw is sosmall that raw materials slip on the fixed jaw. This results in a problem that the fixed jaw is worn out in a short time. Hence, another reaction force receiver mechanism of a so-called up-thrust type is known, in which the swing jaw moves near to thefixed jaw when the swing jaw swings downward from upside. In a jaw crusher having this reaction force receiver mechanism, the angle at which the swing jaw moves near to the fixed jaw is so large that raw materials hardly slip between the jaws. Accordingly, the lifetime of the jaws can be extended.
However, in this up-thrust type, the toggle plate contacts the swing jaw obliquely upward from downside due to the structure of the reaction force receiver mechanism. Therefore, if the tension rod and tension spring are positioned along thetoggle plate in the above-described manner, ends of the rod and spring protrude into a discharge space below the jaw crusher. This results in a problem that the ends of the tension rod and tension spring interfere with crushed materials being dischargedby a discharge conveyer or the like.
In order to prevent the end of the tension rod from protruding in the discharge space, the overall height of the jaw crusher has to be increased. However, in the case that the jaw crusher is mounted on the self-propelled crushing machine, theheight thereof can not be increased unlimitedly due to a height limit for transportation purpose.
The present invention has as an object to provide a jaw crusher of an up-thrust type in which a toggle plate holder mechanism can be installed without increasing the overall height, and a self-propelled crushing machine having the jaw crusher.
A jaw crusher according to the present invention has: a fixed jaw; a swing jaw which swings relative to the fixed jaw; a reaction force receiver mechanism of an up-thrust type including a toggle plate having an end contacting the swing jaw, and atoggle plate support member which another end of the toggle plate contacts; and a toggle plate holder mechanism which holds the toggle plate between the swing jaw and the reaction force receiver mechanism, in which the toggle plate holder mechanismincludes a link.
In the jaw crusher constructed in the structure as described above, the toggle plate holder mechanism includes a link, and the structure can be arranged by changing freely the orientation of the link. Accordingly, the freedom of layout of thetoggle plate holder mechanism in its height direction is enhanced. As a result, even when a reaction force receiver mechanism of an up-thrust type is adopted, for example, ends of the tension rod and tension spring constituting a biasing portion do notprotrude into a discharge space from the frame, so crushed materials can be discharged without problems. In addition, the toggle plate holder mechanism can therefore be installed without changing the overall height. This is advantageous especially fora vehicle-mounted (self-propelled) jaw crusher whose height is restricted.
Desirably in the jaw crusher according to the present invention, the reaction force receiver mechanism has an outlet clearance adjustment mechanism which moves the swing jaw near to and away from the fixed jaw through the toggle plate supportmember and the toggle plate, and the toggle plate holder mechanism has a biasing portion, which biases the swing jaw and the toggle plate support member to the toggle plate and is attached to the toggle plate support member.
In the jaw crusher constructed in the structure as described above, the outlet clearance between the fixed and swing jaws is adjusted as the swing jaw is moved near to or away from the fixed jaw through the toggle plate support member and thetoggle plate, by the outlet clearance adjustment mechanism. As a result, the size of crushed materials can be adjusted so that applicability of the jaw crusher is enhanced.
At this time, the biasing portion of the toggle plate holder mechanism is attached to the toggle plate support member. Therefore, as the toggle plate support member is moved by the outlet clearance adjustment mechanism, the biasing portion ofthe toggle plate holder mechanism moves accordingly. As a result, the bias applied from the biasing portion to the toggle plate is not changed substantially but is kept substantially constant regardless of the size of the outlet clearance. It is henceunnecessary to adjust the bias when the outlet clearance is adjusted. The operation of adjusting the outlet clearance is simplified.
Desirably in the jaw crusher according to the present invention, the toggle plate holder mechanism includes a tension link having an end attached to the swing jaw, a tension lever supporting another end of the tension link, a tension rod havingan end attached to the tension lever, and a tension spring which biases the tension rod in an axial direction of the tension rod, and swing centers at both sides of the tension link are positioned near swing centers at both sides of the toggle plate.
In the jaw crusher constructed in the structure as described above, the tension link swings in accordance with the toggle plate when the swing jaw swings. At this time, the swing centers at both sides of the tension link are provided near theswing centers at both sides of the toggle plate. Therefore, the swing of the tension link is approximate to the swing of the toggle plate. That is, the tension link swings about the vicinity of the swing center on the side of the tension lever, and theposition of the link lever does not change substantially. Accordingly, the bias of the tension spring does not change substantially, and hence, the bias is stable while the swing jaw swings.
Desirably in the jaw crusher according to the present invention, the toggle plate holder mechanism includes a tension link having an end attached to the swing jaw, a tension lever supporting another end of the tension link, a tension rod havingan end attached to the tension lever, and a tension spring which biases the tension rod in an axial direction of the tension rod, and swing centers at both sides of the tension link are located at the same positions as swing centers at both sides of thetoggle plate, when viewed in profile.
In the jaw crusher constructed in the structure as described above, the swing centers at both sides of the tension link are located at the same positions as the swing centers at both sides of the toggle plate, when viewed in profile. Therefore,the toggle plate and the tension link are always kept parallel to each other. While the swing jaw is swinging, the swing of the toggle plate and the swing of the tension link correspond to each other. That is, the tension link swings about the swingcenter of the toggle plate on the side of the tension lever, so that the position of the tension lever does not change at all. Accordingly, the bias of the tension spring does not change but the bias is constant while the swing jaw is swinging. As aresult, the crushing operation can be performed more stably.
Desirably in the jaw crusher according to the present invention, the tension link has a shape having a concave, and a notch is formed, in the toggle plate, at respective positions corresponding to the swing centers at both sides of the tensionlink.
Conventionally, the toggle plate is provided throughout the overall width of the swing jaw. Therefore, interference with the toggle plate may be caused if the swing centers at both sides of the tension link are located near the swing centers ofthe toggle plate or at the same positions as the swing centers of the toggle plate, when viewed in profile. In contrast, in the jaw crasher according to the present invention, the tension link is formed in a shape having a concave, and a notch isformed, in the toggle plate, at respective positions corresponding to the swing centers at both sides of the tension link. Therefore, the tension link and the toggle plate do not interfere with each other, but the swing centers of the tension link canbe steadily located, with an easy structure, near the swing centers of the toggle plate or at the same positions as the swing centers of the toggle plate, when viewed in profile.
Desirably in the jaw crusher according to the present invention, the toggle plate is divided into plural pieces, at a position where the tension link is provided.
Also in the jaw crusher constructed in this structure, the toggle plate is divided at the position where the tension link is provided. Therefore, the swing centers of the tension link do not interfere with the toggle plate but can be steadilylocated near the swing centers of the toggle plate or at the same positions as the swing centers of the toggle plate, when viewed in profile.
A self-propelled crushing machine according to the present invention is characterized in that the above-described jaw crusher according to the present invention is mounted on the machine.
On the self-propelled crushing machine constructed in the structure as described above, the jaw crusher as described above is mounted. Therefore, the effects described above can be attained, and the toggle plate holder mechanism is installedwithout increasing the overall height. This kind of jaw crusher is hence suitably mounted on, especially, a self-propelled crushing machine whose height is limited during transportation. Further, the overall height can be kept short, so that loadingability is improved and reductions in size and weight are promoted.
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