JPS595112Y2 - Dust control device for rock crusher - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dust prevention device for a rock crusher.

In general, a rock crusher has a cylinder (not shown) formed inside the rock crusher, and a piston (not shown) that slides under hydraulic pressure such as hydraulic pressure. A wedge 2 is attached to the tip of the piston of the crusher body 1 and extends forward from the crusher body 1. The wedge 2 is a rod-shaped member that becomes thinner toward the tip. and are floatingly supported at the tip of the crusher main body 1 by an elastic body 3 made of rubber, plastic, etc., and are disposed facing each other so as to sandwich the wedge 2 from both sides in the thickness direction, and extend in the longitudinal direction of the wedge 2, It consists of a pair of shoes 4, 4, each having a bulging portion 4a at its tip end that bulges out so as to come into contact with the inner wall of the rock borehole, and the shoes 4, 4 expand as the wedge 2 moves in and out.
When the shoe 4.4 is contracted and the shoe 4.4 is expanded, the tip bulge 4.
a, 4a presses the inner wall of the rock borehole to generate cracks in the entire rock from the bottom wall of the borehole, thereby crushing the rock.

However, in the above-mentioned conventional rock crusher, the wedge 2 and the shoes 4, 4, which are the parts inserted into the rock drilling machine, are
Since no dust-proofing measures have been taken against the wedge, the wedge 2 and shoes 4, 4 may be exposed to dust particles or sound particles from the hole wall when inserting and withdrawing the rock crusher into a rock drilling hole, or when crushing rock. The dust falls on the sliding surface 5 between the wedge 2 and the shoe 4 through the gap between the shoes 4 and 4.
or the sliding contact surface on which an expansion force of 300 mm or more is applied at the time of crushing, by entering the sliding contact surface 5 after adhering to the outer peripheral surface of the wedge 2 protruding forward from the shoes 4, 4. Seizure, galling, etc. occur in the wedge 5, and as a result, the frictional resistance between the sliding surfaces 5 and 5 increases, causing variations in the spreading force and greatly reducing the spreading force.
Also, there was a problem that the shoes 4, 4 were easily worn and broken, and the durability was deteriorated.

The present invention has been made in view of this point, and the sealing member covers the longitudinal gap between both shoes, and the sealing member is used at the tip of the shoe to cover the side and end surfaces of the wedge that enters and exits further forward than the tip of the shoe. By wiping away the dust adhering to the side and end surfaces of the wedge, it is possible to prevent dust from entering the sliding contact surface between the wedge and the shoe, thereby eliminating the conventional starting defects.
It is an object of the present invention to provide a dust prevention device for a rock crusher that can improve and stabilize the crushing capacity of the rock crusher and improve its durability.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

Incidentally, since the rock crusher has already been described with reference to FIGS. 1 and 2, the same parts are given the same reference numerals and detailed explanation thereof will be omitted.

In Figures 3 to 7, wedge 2 of the rock crusher
A pair of shoes 4, 4 having a U-shaped cross section, which are disposed facing each other so as to sandwich them from both sides.
, 6 are formed, and tapered end seal members 7, 7 made of an elastic material such as rubber or plastic are fixed to the notch stepped portions 6° 6 so as to protrude from the tips of the shoes 4, 4. , Wedge 2 that enters and exits further forward than 4
when the wedge 2 comes into contact with the side 2a of the wedge 2
It is provided to wipe away sand and dust adhering to the surface.

In addition, a shoe 4 is provided at both ends of the opposing surface of the one shoe 4.
Along the longitudinal direction, end face sealing members 8, 8 made of an elastic material such as rubber or plastic and having a substantially semicircular cross section are fixed at one end thereof, and the other end of the end face sealing members 8, 8 is fixed to the other end. The end face seal members 8, 8 are slidably contacted with both end portions of the opposing surfaces of the shoes 4, and are provided so as to cover the gap t along the longitudinal direction between the shoes 4, 4, and furthermore, the tip portions of the end face seal members 8, 8 are connected to the shoe 4. The end surface 2 of the wedge 2 protrudes in a tapered shape from the tips of the shoes 4, 4, and enters and exits further forward than the shoes 4.4 at the tips of the shoes 4, 4.
b, so as to wipe away dust adhering to the end surface 2b when the wedge 2 is retracted.

The wall thicknesses of the end seal members 8, 8 are set so that they do not come into contact with the inner wall of the borehole when inserted into the rock borehole of the rock crusher.

Therefore, in the above embodiment, when inserting and withdrawing the rock crusher into a rock drilling hole, or when crushing,
Even if dust from the perforation wall falls on the surfaces of the shoes 4, 4 and the wedge 2, the end face sealing member 8.8 prevents the shoes 4 from falling.
, 4 along the longitudinal direction, it is possible to reliably prevent dust from entering the sliding contact surfaces 5, 5 from the gap t, and furthermore, from the tips of the shoes 4, 4. To prevent sand and dust from adhering to the wedge 2 moving in and out of the front, the tips of the end face seal members 8, 8 and the end seal member 7.7 protect the end face 2b and side face 2a of the wedge 2, respectively.
By contacting the wedge 2 with the shoe 4.4
Since the dust is wiped away as it is moved inward, it is possible to similarly prevent dust from entering the sliding surfaces 5, 5.

Therefore, the crushing ability of the rock crusher can be fully and stably demonstrated without the occurrence of seizure or galling due to the intrusion of sand and dust into the sliding contact surfaces 5, 5 as in the conventional case.
Its durability can be improved.

Furthermore, if the shoes 4, 4 are formed to have a U-shaped cross section as in the above embodiment, the wedge 2 will be guided between the shoes 4, 4, and the wedge 2 will move in and out smoothly, improving its stability. It has the advantage of being good.

In the above embodiment, the end seal members 8, 8 are both fixed to the side surface of one shoe 4 and brought into sliding contact with the other shoe 4. The other ends may be alternately fixed to the shoes to be alternately slid into contact with each other, and
The end seal member and the tip seal member may be integrally formed at the shoe tip.

Furthermore, it goes without saying that the present invention can also be applied to a rock crusher in which the wedge 2 is in flat contact with the shoes 4 on a single plane.

As described above, according to the present invention, in a rock crusher, the seal member covers the gap along the longitudinal direction of two opposing shoes, and the seal member is moved in and out at the tip of the shoe further forward than the tip of the shoe. By contacting the side and end surfaces of the wedge, it is possible to reliably prevent dust from entering the sliding contact surface between the wedge and the shoe, thereby stably improving the crushing capacity of the rock crusher. At the same time, it is possible to improve the durability.

Furthermore, the improved durability has excellent practical effects, such as the ability to reduce costs by using inexpensive materials.

[Brief explanation of the drawing]

Figures 1 and 2 are a longitudinal sectional view and a bottom view of a conventional rock crusher, respectively, Figures 3 and 7 illustrate an embodiment of the present invention, and Figure 3 shows the state when the shoe is contracted. 4 and 5 are cross-sectional views taken along lines IV-IV and VV in FIG. 3, respectively, and FIGS. 6 and 7 are partially cutaway views showing the state when the shoe is expanded, respectively. FIG. 3 is a cutaway side view and a bottom view. 1... Crusher main body, 2... Wedge,
2a...Side surface, 2b...End surface, 3...
...Elastic body, 4...Shoe, 4a...
...Bulging portion, 5...Sliding surface, 6...Notch step, 7...Tip seal member, 8...
・End face seal member.

Claims (1)

[Scope of utility model registration request] A crusher body has a cylinder formed inside and a piston that slides by hydraulic pressure is inserted into the cylinder, and a rod-shaped member attached to the tip of the piston and extending forward from the crusher body, which becomes thinner toward the tip. A wedge formed in a wedge shape, and a wedge that is floatingly supported at the tip of the crusher main body, is disposed facing each other so as to sandwich the wedge from both sides in the thickness direction, and extends along the longitudinal direction of the wedge, and has a rock at the tip. The shoe has a bulge that bulges out so as to come into contact with the inner wall of the borehole, and the shoe is expanded and contracted by moving the wedge in and out, and as the shoe expands, the bulge at the tip presses against the inner wall of the rock borehole. In a rock crusher that generates cracks in the entire rock from the bottom wall of the hole, the side and end surfaces of the wedge cover the gap along the longitudinal direction between the two shoes and enter and exit further forward from the shoe tip at the shoe tip. 1. A dustproof device for a rock crusher, characterized in that a sealing member is provided in contact with the shoe, and the sealing member prevents dust from entering into the sliding contact surface between the shoe and the wedge.