JP2009062700A - Device for reducing hammering noise and vibration noise in hydraulic-driven breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce hammering noise and vibration noise caused when a piston hammer directly hits a breaking chisel in a hydraulic-driven breaker. <P>SOLUTION: This hydraulic-driven breaker comprises: a soft seal brought into contact with an anvil 6 having a vibration resistance 6a for transmitting a hammering force from a piston hammer 5 to the breaking chisel 7 and a semi-spherical projecting surface 6b at the end and the chisel 7 having a semi-spherical projecting surface 7c and installed in a detachable cylindrical guard 8 secured to the lower part of a breaker holder 2; and a spring seal 10 attached to a cylindrical guard end so sliding as to closely follow up the movements of the chisel in the longitudinal and lateral directions other than the axial direction. Therefore, hammering noise and vibration noise can be reduced, sealed, and cut out to suppress noise to the outside. Consequently, the hydraulic-driven breaker with high silence can be provided to improve working environment and reduce the fatigue of the user. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a crusher for civil engineering construction, and more particularly to a device for reducing impact noise and vibration noise in a hydraulically driven crusher.

  Conventionally, hydraulically driven crushers have a main force in realizing a strong and stable striking force of the piston hammer, and the hydraulic hammer crusher main body and the main body are supported as countermeasures against piston hammer striking noise and vibration noise. Anti-vibration rubber is sandwiched between the bracket (see Patent Document 1) to reduce the impact noise and vibration noise.

  However, with this method, since the entire crusher is covered with a thick steel plate, the whole is heavy and unbalanced, and the working range is narrower than that of a normal crusher, and wall crushing and upward crushing operations are extremely difficult.

  In addition, the structure was inconvenient for maintenance when the crusher failed and for daily maintenance.

  Also, the countermeasures around the chisel mounting area (see Patent Document 2) are difficult to use for wall crushing or upward crushing, such as tunnel work or brick repair of a smelting ladle, which is biased to a limited work environment. There are problems with work efficiency and durability.

Utility Model 5-377 (2nd page, Fig. 1) JP 2006-22568 ((Page 1, Fig. 1)

  Therefore, a cylindrical guard that can be attached to and detached from the lower part of the holder of the hydraulically driven crusher, can be applied to the crushing chisel by the piston hammer in the chamber, or through the anvil and the continuous impact noise and vibration sound from the chisel. A soft seal that is in close contact with the chisel provided in the middle of the guard and a spring seal that is tightly coupled and slid freely in conjunction with forward / backward and left / right movements other than the axial direction of the chisel. We devised a method to reduce the impact noise and vibration noise.

  SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to reduce continuous impact noise and vibration sound with a crushing chisel by a piston hammer in a chamber or continuous impact noise and vibration sound with the chisel via the anvil. It is.

  In order to solve the above problems, in the hydraulically driven crusher, the vibration is directly received from the piston hammer, the anvil having a hemispherical convex shape on the end face, and the impact of the piston hammer via the anvil. A cylindrical guard with a hemispherical convex shape formed on the end face can be attached to the lower part of the holder, a soft seal in close contact with the chisel provided in the middle of the guard, and the axial direction of the chisel A reduction device that reduces the impact noise and vibration noise to the outside by reducing the impact noise and vibration noise by assembling them in series in a spring seal that is tightly coupled freely in conjunction with forward / backward and left / right movements.

  A detachable cylindrical guard is fitted in the lower part of the holder of the hydraulically driven crusher, and two pins are inserted and held at right angles to the guard, and the loosening prevention plate is sandwiched between the guards. A cylindrical nut is fitted to a screw portion formed on the outer periphery of the steel plate, and after tightening, the nut and the plate are fixed by a lock bolt to fix the guard.

  A bearing in close contact with the chisel is fitted on the end of the guard and guided so that the chisel can reciprocate.

  The bearing is provided with a spring seal that freely slides in close contact with the front / rear / left / right movements other than the axial direction of the chisel, and the piston hammer and the anvil, and the impact noise and vibration sound of the anvil and chisel are sealed. Blocks and prevents intrusion of dirt and dust from outside.

  A right-handed round screw on the outer periphery of the bearing, a female screw is cut, a right-handed coil spring is wound, the spring seal is fixed to the bearing, and the tightly-sliding structure is freely movable in the forward / backward and left / right directions other than the axial direction of the chisel To do.

  A right-handed round screw is wound around the inner periphery of the bearing, a female screw is cut, and a right-handed coil spring is wound inwardly. The spring seal is fixed to the bearing with a lining, and the chisel is freely in close contact with the front, rear, left and right movements other than the axial direction. A sliding structure is also possible.

  A right-handed square screw is wound around the outer periphery of the bearing, a right-handed square coil spring is wound around the bearing, and the angular spring seal is fixed to the bearing so that the angular spring seal can move back and forth and right and left except in the axial direction of the chisel. A tightly coupled sliding structure is also possible.

The chisel is assembled in the crusher by the above method and the chisel is provided with a long hole at an arbitrary central position in the axial direction of the guard and is held by the plate. The cover is prevented from falling off by the cover. Refer to FIGS. 8, 9, and 10. The plate mounting position may be a structure that does not stick to an arbitrary central position in the axial direction. See FIG. 9 The chisel drop-off prevention plate may have a round pin shape. See FIG.

  The chisel that receives impact force from the piston hammer via the anvil has a clearance of 0.1 mm to 0.5 mm smaller than the inner diameter of the bearing to protect the soft seal and seals impact noise and vibration noise. Also, the lubricated grease is prevented from flowing out.

  The chisel may be held in a notch structure in which the slot is aligned with the position of the guard in the axial direction and is larger than the maximum stroke of the anvil in the axial direction. See FIG. 11 and FIG.

  The outer diameter of the tip of the chisel is larger than the inner diameter of the bearing of the chisel, and is equal to or larger than the outer diameter of the bearing, so that the gap between the stepped portion and the tip end surface of the spring seal is minimized to prevent intrusion of earth and sand. Refer to FIG. 11 and FIG.

  According to the present invention, it is possible to reduce the impact noise and vibration noise without the need for an anti-vibration rubber etc. between the hydraulically driven crusher body and the bracket, and it is lightweight, well balanced and has a wide work range, such as wall crushing and upward crushing. Improvement in efficiency and maintenance are easy and economical.

  A soft seal in close contact with a crushing chisel provided in a detachable cylindrical guard and a spring seal that is tightly coupled and slid freely back and forth in conjunction with the movement of the chisel in a direction other than the axial direction. Thus, the impact noise and vibration noise of the piston hammer and the anvil, the anvil and the chisel can be sealed to reduce the noise and the like.

  In the present invention, a detachable cylindrical guard 8 is fitted into the lower part of the holder 2 of the hydraulically driven crusher C, and two pins 11 are provided in two notches 8c provided in the guard 8. The nut 17 and the plate 16 are fixed by the lock bolt 13 after the cylindrical nut 17 is clamped with the looseness prevention plate 16 inserted and held, and the guard 8 is fixed.

  A vibration isolator 6a is formed on the anvil 6 that is directly hit by the piston hammer 5, and a hemispherical convex shape 6b is formed on the end surface. A hemispherical convex shape 7c is also formed on the end surface of the crushing chisel 7 that is in contact with the anvil 6 and receives impact energy. The anvil 6 and the chisel 7 are assembled in series in the guard 8, and the anvil 6 is held by a retainer pin 12 and the chisel 7 is held by a plate 18 to prevent dropping.

The tip bearing 9 of the guard 8 is in close contact with the chisel 7 and is linked to and held by a spring seal 10 that slides in close contact with the chisel 7 in the forward / backward and left / right direction in conjunction with movements other than the axial direction. The apparatus is composed of a device for reducing impact noise and vibration noise in the hydraulically driven crusher c, which seals vibration noise and reduces external impact noise and vibration noise.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a hydraulic excavator body A, FIG. 2 is a sectional view of the embodiments of the present invention, and FIG. FIG.

  First, a hydraulically driven crusher C is attached to an arm B of a hydraulic excavator main body A via a bracket, and the pressure oil generated by the hydraulic pump D is operated to the control valve 4 through the hydraulic pipe E by operating the operation valve F. The piston hammer 5 is actuated.

  The structure of the hydraulically driven crusher c is well known and is not the gist of the present invention. Therefore, the detailed explanation is omitted, but the piston hammer 5 has a structure in which descending and rising are alternately repeated by switching the pressure oil.

  The anvil 6 and the chisel 7 incorporated in series in the guard 8 are also interlocked with the movement of the downward movement and the upward movement of the piston hammer 5.

  In the crusher C, a chamber 20 is provided at the lower part of the internal path of the cylinder-1, a cylinder head 3 is provided at the upper part of the cylinder-1, a holder 2 is provided at the lower part, and a controller is provided at a part of the cylinder-1. A valve 4 is provided.

  The cylinder 1 is provided with a piston hammer 5 that looks into the chamber 20, and the chamber 20 has the anvil 6 formed with a vibration isolating 6a and a hemispherical convex shape 6b at the lower end of the piston hammer 5. A crushing chisel 7 having a hemispherical convex shape 7c in contact with the anvil 6 is provided in series.

  The anvil 6 receiving a striking force from the piston hammer 5 is held by a retainer pin 12, and the crushing chisel 7 is held by a plate 18 to prevent falling off, and the plate 18 is held by a cover 19. ing.

  Further, a removable cylindrical guard 8 is fitted in the lower part of the holder-2, and two pins 11 are inserted and held in two notches 8c provided in the guard 8, thereby preventing a loosening plate. After tightening the nut 17 with the pin 16 in between, the nut and the brat 16 are fixed by the lock bolt 13 and the guard 8 is fixed.

  The detachable cylindrical guard 8 is provided with a hole 8a communicating with the oil supply hole 14 of the nut 17 and the sliding of the inside of the guard 8 with the anvil 6 and the crushing chisel 7 with the supplied grease. Reduces wear and cools parts.

  In the guard 8, an anti-vibration 6a receiving the striking force of the piston hammer 5, an anvil 6 having a hemispherical convex shape 6b, and a crushing chisel 7 having a hemispherical convex shape 7c are arranged in series. Depending on the retainer pin 12, the chisel 7 is held by a plate 18 to prevent it from falling off, and the plate 18 is held by a cover 19.

  Further, a bearing 9 is externally fitted to the guard 8, and a spring seal 10 that is in close contact with the bearing 9 and the chisel 7 and slides in close contact with the front and rear and in the left and right directions other than in the axial direction is connected and held. Sound is shut off.

  The spring seal 10 prevents the grease supplied in the guard 8 from flowing out together with the soft seal 15 provided in the guard 8 and prevents intrusion of dirt and dust from the outside.

  Next, the method of the present invention will be described based on the apparatus having the above-described configuration. In the hydraulically driven crusher C, the piston hammer 5 and the vibration isolating 6a and the hemispherical convex shape 6b that receive direct impact force are formed. An anvil 6 and a soft seal that is in intimate contact with the crushing chisel 7 via the anvil 6 and a spring seal 10 that slides in close contact with the forward / backward and left / right movements other than the axial direction of the chisel 7 are provided. It is a reduction device that reduces and seals impact noise and vibration noise.

  The guard 8 fitted into the lower part of the crusher holder-2 is inserted and held at two pins 11 at right angles to the guard 8, sandwiching the loosening prevention plate 16, tightening the nut 17 and then locking the lock bolt. The nut 17 and the plate 16 are fixed by the bolt 13 and fixed to the gate 8.

  The plate 16 has a donut disk shape and is formed with a plurality of holes 16b and one long notch 16c on a plane. See FIG.

  The plate 16 is fitted on the outer periphery of the guard 8 and is formed in the holder 2 in accordance with an arbitrary hole 16b of the plate 16.

  The plate 16 is fixed to a hole provided in the holder-2 by a pin 16a.

  Further, a pin is inserted into the hole 8b provided in the outer periphery of the guard 8 and the long notch 16c provided in the plate 16 to fix the guard 8 and the plate 16 together.

  After the plate 16 is sandwiched between the holder 2 and the nut 17 is fitted and tightened to the threaded portion of the guard 8, the nut 17 is aligned with the hole 16 b provided in the plate 16, and the nut 17 is locked to the lock bolt 13 To secure the plate and prevent loosening.

  The nut 17 is provided with an oil supply hole 14, and the supplied grease communicates with the oil supply hole 8 a of the guard 8 to reduce the internal wear of the anvil 6, the chisel 7, and the guard 8 and to cool the grease.

  Anti-vibration rubber 6a or the like is baked on the anvil 6 at an arbitrary position on the outer periphery, and is attached with a fork adhesive or the like to absorb impact noise and vibration noise to reduce the vibration.

  The anvil 6 is provided with a ring-shaped groove at an arbitrary position on the outer periphery, and a cloth-made phenol resin wear ring is fitted into the groove to prevent galling and eccentricity between the anvil and the inside of the guard.

  The anvil 6 is formed with a hemispherical convex shape 6b to reduce the striking surface of the chisel 7 with the hemispherical convex shape 7c, thereby reducing the impact noise.

  The guard 8 is subjected to heat treatment such as carburizing and high frequency for special steel so as to have hardness and toughness, thereby reducing external and internal wear and improving durability.

  The guard 8 and the bearing 9 are designed to be partially replaceable when screwed, press-fitted, shrink-fitted, or the like needs to be replaced due to damage or excessive wear, thereby reducing maintenance costs.

  If necessary, the guard 8 and the bearing 9 can be formed as a single body.

   The wire diameter and the number of windings of the spring seal wound and connected to the bearing 9 are not specified. See Figure 5

  The spring seal 10a is fitted to the bearing 9a, and the wire diameter and the number of turns of the spring are not specified. See FIG.

  The bearing 9b and the spring seal 10b are wound with a square spring on the outer periphery, and the spring angular thickness and the number of turns are not specified. See FIG.

  The tip shape of the chisel is improved in work efficiency by changing the shape depending on the object to be crushed.

  According to this invention, the impact noise and vibration noise reducing device technology in the hydraulically driven crusher C is established and manufactured and sold on the basis thereof, thereby reducing the impact noise and vibration noise and improving the working environment. This is beneficial for reducing user fatigue.

It is a side view which shows-embodiment of the hydraulic shovel main body used for this invention. It is embodiment sectional drawing of this invention. 2 is an enlarged cross-sectional view of the main part. Anvil cross section External winding spring seal mounting cross section Cross section of lining spring seal installation Cross section of external winding angle spring seal mounting Guard cross section Guard cross section Guard cross section Chisel perspective view Chisel perspective view Plate perspective view

Explanation of symbols

1 cylinder
2 Holder
5 Piston hammer
6 Anvil
7 Chisel
8 guards
9 Bearing
10 Spring seal
15 Soft seal
16 Plate
17 Tubular nut

Claims (2)

    In a hydraulically driven crusher, vibration is received directly from the piston hammer, and an anvil with a hemispherical convex shape on the end face, and a chisel with a hemispherical convex shape formed on the end of the anvil are attached and fixed to the bottom of the holder. A cylindrical seal, a soft seal provided in the middle of the guard, and a spring seal at the tip of the guard are integrated in series to reduce impact noise and vibration noise. A device for reducing impact noise and vibration noise in a hydraulically driven crusher characterized in that it reduces the impact noise and vibration noise.     2. A device for reducing impact noise and vibration noise in a crusher according to claim 1, wherein an anvil having a vibration-proof and hemispherical convex shape is incorporated between the piston hammer and the crushing chisel in the hydraulically driven crusher.

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