US3219287A

US3219287A - Means for compensating the inertia forces in jaw crushers

Info

Publication number: US3219287A
Application number: US300944A
Authority: US
Inventors: Weiss Hermann
Original assignee: Eisenwerk Weserhuette AG
Current assignee: Eisenwerk Weserhuette AG
Priority date: 1962-08-11
Filing date: 1963-08-08
Publication date: 1965-11-23
Anticipated expiration: 1982-11-23
Also published as: GB966954A; DE1260937B; FR1366330A

Description

H. WEISS Nov. 23, 1965 MEAN FOR GOMPENSATING THE INERTIA FORCES IN JAW CRUSHEHS Filed Aug. 8, 1963 FIG. 2

16 INVENTOR.

HERMANN wuss ATTORNEY United States Patent 0,

3,219,287 MEANS FOR COMPENSATING THE INERTIA FORCES IN JAW CRUSHERS Hermann Weiss, Muhlenweg, Germany, assignor to Eisenwerk Weserhuette A.G., Bad Oeynhausen, Germany, a corporation of Germany Filed Aug. 8, 1963, Ser. No. 300,944 Claims priority, application Germany, Aug. 11, 1962, E 23,372 6 Claims. (Cl. 241-267) This invention relates to a jaw crusher, of the type used in crushing rocks and other hard materials, in which a movable jaw pivotably mounted at one end thereof has an oscillating movement imparted thereto, and more particularly, the invention relates to such a jaw crusher in which the inertia forces of the movable jaw are compensated.

It is known to partially compensate inertia forces in jaw crushers having a pivotably mounted oscillatable jaw, which inertia forces are produced by rotation of certain parts of the crusher or by the oscillating movement of the movable jaw, by the use of balance weights, or counter weights, which are connected to the flywheel, the latter generally also serving as the drive pulley. However, these heretofore known compensating means compensate only for the inertia of the rotating elements and not of the oscillating elements.

These existing disadvantages and drawbacks are eliminated in the jaw crusher of the present invention by the provision of a mass as a counterbalance, or damper weight, which is suspended in the fashion of a pendulum pivotably mounted on the frame of the crusher, which mass oscillates in a direction opposite to the oscillation of the movable jaw. The compensating movement is performed by means of a linkage system connected between the movable jaw and the mass suspended as a pendulum on the frame of the crusher, while the force to be compensated is transmitted by a crank mechanism provided on an eccentric drive shaft, or by other force transmission means. Thus, a positive connection is effected between the movable members which guarantees quiet operation of the apparatus. The compensating mass which is mounted for oscillation on the frame of the crusher is connected to the frame by means of a spring in a manner such that resonance conditions prevail in the system constituted by the mass and spring within the normal operating speed range of the crusher, so that the stress on the connecting elements is largely relieved. Further, it is possible to make the natural vibration or oscillation of the compensating mass equal to the crusher speed and, in this case also, the connecting elements are stress relieved.

In combination with the foregoing compensating means, balance weights may be provided on the eccentric drive shaft for the compensation of the inertia forces of the rotating masses, these balance weights preferably being mounted on the drive shaft instead of on the drive pulley. As a result of this arrangement, another source of vibrations is eliminated so that all of the inertia forces of the crusher are completely compensated.

As a result of the mounting of the balance or damper weights on the eccentric shaft rather than on the flywheel, or combination flywheel and drive pulley, it is possible to connect the drive pulley with the eccentric shaft through a normal overload or safety clutch such as one of the known torque-limiting overload safety devices. Very large forces, however, can be produced in the crank end positions in jaw crusher drives and, for this reason, it is preferable that the torque-limiting device be combined with a spring suspension within the crank system.

Such a spring suspension mechanism preferably operates 3,219,287 Patented Nov. 23, 1965 See through a lever system because of the large forces transmitted. It is necessary only that the spring be compressible through a distance corresponding to a part of the length of the total stroke since at a position of the eccentric, i.e., the position of the eccentric shown in the drawings or revolved from the position shown, the torque-limiting safety device will be actuated in the case of an overload.

The invention will be further illustrated by reference to the accompanying drawings in which:

FIGURE 1 is a sectional view in elevation through one embodiment of a jaw crusher according to the present.

invention, and

FIGURE 2 is. a sectional view taken on line IIII of FIGURE 1 and looking in the direction of the arrows.

Referring to the drawings, the jaw crusher has a housing or frame 2 and a shaft 1 fixedly secured thereto. A movable jaw 3 is pivotably mounted on the shaft 1 and has, on the side facing the crushing channel 4, a replaceable crushing face 5 which is fabricated from a highly wearresistant material such as case hardened steel, for example. A fixed jaw 6 is secured to the housing or frame end wall 7 opposite the crushing face 5 on the movable jaw 3. On the opposite side of the movable jaw 3, adjacent the lower end thereof, a lever portion 8 is disposed upon which presses the thrust transmission element 9, the latter being supported, by means of the bearings 10, on an eccentric portion 11 of the drive shaft 16. The crushing gap, which is formed at the lower end of the fixed jaw 6 and the movable jaw 3, may be varied by the insertion of shims 12 in the thrust transmitting element 9.

A counterweight 14 is connected with the movable jaw 3 through a linkage 13 and the weight of the counterweight 14 may be adjusted, in accordance with the inertia force generated by the movable jaw 3, by adding additional weight to the counterweight 14. Due to the pivotable mounting of the counterweight 14 and the lever connection 13 to the movable jaw, the counterweight 14 executes oscillating movements in a direction opposite to the oscillations of the movable jaw 3. In some cases, it is desirable to connect a spring 15 between the counterweight 14 and the frame 2 so that resonance conditions prevail in the system constituted by the counterweight 14 and the spring 15. The stress on the force transmission system is thereby considerably relieved.

The drive shaft 16, having the eccentric portion 11 thereon, is mounted in the frame 2 in suitable bearings and the shaft has adjustable counterbalance or damper weights 17 fixed thereto. As shown in the drawings, the combination flywheel and drive pulley 18 is connected with the drive shaft through the cone clutch 19 and hub portion 20. The engaging pressure of the cone clutch 19 may be produced by the spring 21, for example.

The inertia forces produced by rotation of the eccentric portion 11 of the drive shaft 16 are compensated by the counterweights 17 and the inertia forces produced by oscillation of the movable jaw 3 are compensated by the oscillating counterweight 14. If any unbreakable body should be introduced into the crushing channel 4, the spring 22 is compressed by the lever 8, whereupon the cone clutch 19 will act upon the drive pulley 18, i.e., the drive pulley 18 will then rotate freely.

It will be obvious to those skilled in the art that many modifications may be made within the scope of the present invention without departing from the spirit thereof, and the invention includes all such modifications.

What is claimed is:

1. A jaw crusher comprising a frame, a fixed jaw thereon, a movable jaw pivotally mounted at one end thereof on the frame, means for oscillating the movable jaw, and compensating means connected to the movable jaw and mounted for oscillation in a direction opposite thereto, whereby the inertia forces of the movable jaw are compensated.

2. A jaw crusher according to claim 1 in which the compensating means includes a weight mounted for 0scillation about a pivot on the frame and being connected to the movable jaw through a linkage.

3. A jaw crusher according to claim 1 in which the compensating means is connected to the frame by a spring such that resonance conditions prevail for the system constituted by the compensating means and spring within the operating speed range of the crusher.

4. A jaw crusher according to claim 1 in which the means for oscillating the-movable jaw includes an eccentric shaft having balance weights thereon.

5. A jaw crusher according to claim 1 in which the means for oscillating the movable jaw includes an eccentric shaft having a drive pulley thereon which drives through a torque-limiting overload clutch.

4 6. A jaw crusher according to claim 1 in which the means for oscillating the movable jaw includes a spring suspension means, the path of which has a length less than that of the crushing stroke.

References Cited by the Examiner UNITED STATES PATENTS I. SPENCER OVERHOLSER, Primary Examiner.