JPH0716895B2 - Device consisting of striking device and supporting unit - Google Patents

Abstract

1. An arrangement comprising a carrier unit (3; 103) and an impacting unit (2; 102; 202) which is disposed inside the carrier unit, is connected thereto via resilient damping elements (31; 131; 231, 231a; 331, 331a) and contains a piston (26) adapted to make a traversing movement in a cylinder (25) in the direction of an anvil-like tool (1), characterized by the following features : - the carrier unit (3; 103) has two side cheeks (16; 116) interconnected via pins (20; 44) ; - the arrangement has pairs of shaped elements (20/29; 41/46; 52/56) ; - of each pair one shaped element (20; 41; 56) is associated with the carrier unit (3; 103; 203) and one shaped element (29; 46; 52) is associated with the impacting unit (2; 102; 202) ; - the shaped elements have a section having a central axis lying in a plane aligned perpendicularly to the axis of the impacting unit (2) ; - the shaped elements are in the case of all forces occurring between the impacting unit (2) and the carrier unit (3) maintained at a distance in the direction of the axis of the impacting unit (2) upwards and downwards and, at least in connection with a further pair of shaped elements, in directions aligned transversely of the axis of the impacting unit (2) by resilient material of damping elements (31; 131; 231, 231a; 331, 331a), such damping elements being positively or non-positively connected to the shaped elements.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is a device comprising a support unit and a striking device arranged inside the support unit, wherein a muffling means is provided in the striking device. The striking device is connected to the support unit via an elastic cushioning element that works upward in the axial direction of the striking device and in a direction orthogonal to the axial direction, and the striking device faces the anvil-shaped tool. The present invention relates to a type having a piston movable in translation in a cylinder.

[Conventional technology]

In this type of device, the support unit is generally screwed to a connecting member which is pivotally mounted on the jib of the traversable support device.

According to the known device, a hydraulic hammer as a striking device is axially supported by a box-shaped supporting unit via a pressing spring. Although an elastic stopper is additionally provided for softening and limiting the movement of the hammer, since the hammer is guided in the friction plate arranged in the support unit, vibration due to impact is not generated. Emitted directly through the casing or support unit,
This causes a significant noise load in the surroundings.

According to German Utility Model Registration No. 8331703, when the tip of the bit is axially loaded, the hammer is, via an elastic damping block, closed into a cylindrical shape of the support unit. Devices are known which are adapted to be axially supported towards a casing. The hammer is supported radially with respect to the casing by means of a preloaded hollow cylindrical damping element. When not axially loaded, the hammer is spaced apart against a metal blocking member that is fixed directly to the casing, so that in this case an unbuffered metallurgical bond is formed between the hammer and the casing. It In particular, even when the radial force generated between the hammer and the casing during the trenching operation exceeds the elastic linear range of the hollow cylindrical cushioning element, the metal annular member is interposed between the hammer and the casing. A metallic bridge is formed that causes noise.

Further, there is known a device in which a hammer is connected to a box-shaped casing of a support unit via a rubber member provided on the side. This allows for axially buffered relative movement between the hammer and the casing. However, in this device, the rubber member is subjected to the largest load, and the soft elastic material is subjected to a particularly disadvantageous shear load. Moreover, since the radial force is directly transmitted between the hammer and the casing, effective noise reduction cannot be obtained at least when the force acts in the radial direction.

Besides noise, it has the following drawbacks. That is, especially during work having a radial load that occurs during trenching work, radial impact is reflected from the bit tip to the hammer, which causes an inertial force that is more disturbing at higher masses. When a direct metal connection is formed between the hammer and the supporting unit and the supporting device, a very large mass is present, so that the bit, the hammer, the supporting unit and the supporting device have a correspondingly large breaking effect. Occurs.

[Problems of the Invention]

The object of the invention is therefore a device of the type mentioned at the outset, which has a striking device and a support unit, and which, even when an excessive force, i.e. a large force occurring in the device, in particular a radial force, is applied. It is an object of the present invention to provide an effective noise reduction even when an unloaded post-stroke is applied, and yet an operation that effectively protects the device is possible.

[Means for Solving the Problems]

According to the present invention which has solved the above-mentioned problems, (a) the support unit has two side walls connected to each other only by pins, and (b) a large number of constituent elements forming a pair are provided. One of each pair of these pair of components, at least partially formed by, the other component is respectively configured as a hollow cylinder as a component of the striking device,
(C) The pin as one of the pair of components and the other component have a central axis that lies in a plane extending in a direction orthogonal to the axis of the striking device, and (d) The pin as one component and the other component are the pair of components in shape connection type or friction connection type at all forces generated between the striking device and the support unit when the device is driven. A shock-absorbing element fixed to the striking device holds the striking device at a lower position in the axial direction.

[Action]

By connecting the side walls by means of pins, it is possible to dispense with the end walls which would otherwise have to be provided on the support unit. This significantly reduces the wall area,
Noise reflections are also reduced. Moreover, a very lightweight support unit was obtained, which simplifies the manufacture and assembly.
The accessibility of the striking device to the worker was also significantly improved. By providing the components which extend in a direction orthogonal to the axis of the striking device, the elastic material of the cushioning element arranged between these components is placed above and below the main load direction in favor of the elastic material. This increases the service life of the damping element, since it is only loaded with good pressure. The tensile and shear loads of the elastic material are applied only in the direction orthogonal to the hammer axis direction in the low load range. According to the invention, there are no mechanical or metallic restrictions in the device relative to each other beyond the linear range of the cushioning material, so that in a suitably configured device according to the invention, the hammer and support It is ensured that the metallic contact with the unit causes undesired noise and high friction. By arranging the damping element according to the invention, it is possible to reliably guide the hammer in the support unit even when the damping element is installed without preload.

The provision of a purely elastic support structure between the hammer and the support unit increases the service life of the support unit, the striking device and its tool.

A cushioning element placed between one part, which is partly cylindrical, and the other, which is partly hollow, provides all that occurs in the main or longitudinal center plane of the device. A pure pressure load is obtained even in the event of a radial force.

By means of the second claim, the number of pins holding the side wall of the support unit is reduced to a minimum.

According to the measures described in claims 3 to 5, the proportional spring characteristic curve of the cushioning material can be further progressively raised, but the claims of claim 4
A particularly simple procedure is carried out using the adhesive bond described in the paragraph. By progressively increasing the spring characteristic curve, the other constructions are the same and the metal connection between the striking device and the support unit is avoided with high certainty.

Additional noise echo suppression means are set forth in claims 6 and 7.

〔Example〕

Next, the configuration of the present invention will be specifically described with reference to the embodiments shown in the drawings.

In the embodiment of FIG. 1, a hydraulic percussion hammer 2 (percussion device) with a percussion bit 1 is arranged in a guide unit or a support unit 3. The supporting unit 3 itself is fixed to the connecting member 4 fixed to the jib 5 of the supporting vehicle 6. The jib 5 has a main arm 7 pivotally mounted on a main girder 8. The main girder 8 is rotatably supported by the supporting vehicle 6 and can be changed in angle by a hydraulic device 9. The angle of the main arm can be changed by the hydraulic cylinder 10. An extension arm is provided at the free end of the main arm 7.
11 is pivotally mounted and the angle of this extension arm 11 with respect to the main arm is changed by one hydraulic cylinder 12. The angle of the connecting member 4 can be adjusted with respect to the extension arm 11 by the other hydraulic cylinder 13. The striking bit 1 is thus in the plane of the drawing by said jib, i.e. at the same time also the central plane of the jib 5, at different heights, widths and angular positions over a wide range with respect to the ground 14 to be ground. Driven by.

In a first embodiment of the device according to the invention consisting of a support unit 3 and a striking hammer 2 shown in FIGS. 2 and 3, the guide or support unit 3 has two side walls 16 The two side walls 16 are each screwed to the connecting member 4 via a flange 17. The side wall 16 has three pairs of bushes 18 each having a coaxial hole 19 at three locations. Each of these holes 19 has a common pin
20 (one component) are inserted and these pins 20 are axially fixed in the support unit 3 by tightening pins 21 at both ends.

The device shown in FIG. 2 is an enlarged view seen from the same side as the device attached to the supporting vehicle 6 shown in FIG.
The device shown in FIG. 3 is a sectional view taken along line III-III in FIG. The center line indicated by the one-dot chain line in FIG. 3 indicates the longitudinal or main center plane 23 of the device, while the center line indicated by the one-dot chain line in FIG. 2 indicates the cross-section center plane 24. ing.

A striking piston 26 driven by a cylinder 25 shown by a broken line in FIG. 2 acts on the striking bit 1 in a pulsating manner, and the striking hammer 2 has three through holes 27 (the other component). Therefore, the arrangement and shape of these three through holes 27 match the arrangement and shape of the holes 19 formed in the side wall 16. The through hole 27 is at the center, and the shoulder 28 has a brim shape.
It has a cylindrical extension 29 bounded by and an outer support 30 respectively. The chamber between the cylindrical extension 28 of each through hole 27 and the associated pin 20 of the support unit 3 is filled with a damping element 31 of soft elastic material. This device has a total of three elastic connections thus configured between the support unit 3 and the striking hammer 2.

Pin 20 with cushioning element 31 when assembled
Is squeezed through the support portion 30 and into the through hole 27 until the material of the cushioning element 31 completely fills the cylindrical extension portion 29.

In the illustrated device, the hammer 2 and the support unit 3
Between, and the main force occurring in the main center plane 23 is accompanied by a vertical or axial component in relation to the percussion bit 1 and the cylinder 25 and a horizontal or radial component. It is transmitted satisfactorily. The elastic material has a progressively increasing spring characteristic curve. That is, since the transmitted force increases in proportion to the deflection or relative movement between the hammer 2 and the support unit 3, a change in a range where a large force is applied causes only a slight change in the relative movement. Absent. The radial spacing of the metal part between the bushing 18 of the support unit 3 and the striking hammer 2 (related to the pin 20) ensures that metal-to-metal contact is avoided even when the maximum possible force occurs. It has been selected to such an extent. The axial spacing between the striking hammer 2 and the bush 18 (also associated with the pin 20) likewise produced the maximum force expected, with the component force extending perpendicular to the main center plane 23. The size is selected so that the metals do not come into contact with each other even at times.

Between the side walls 16 of the support unit 3, a band-shaped covering portion 32 made of a sound absorbing material is arranged. A cover 32 having openings 33, 34 for passing a tube 35 for the hydraulic medium or for passing the striking bit 1 is provided by a bent portion 36 of the side wall 16.
It is held by and extends to the underside of the hammer 2. The side wall 16 is covered on the inside with a sound deadening mat 37 for further sound deadening.

In the simplest embodiment, the damping element 31 is connected by force or frictional connection to the surface of the pin 20 or the corresponding surface of the through hole 27 of the hammer 2 against which the through hole is connected.
The shoulders 28 and bushes 18 of 27 form a partial form-fitting connection with the damping element 31 only on the sides. The inside of the substantially cylindrical damping element 31 is also connected to the pin 20 by means of an adhesive, whereby the spring characteristic curve (the force exerted in response to the relative movement between the impact hammer 2 and the support unit 3) is progressive. Rise.

〔effect〕

As described above, according to the present invention, the maximum force that can be expected,
In particular, even when a radial force is applied and when the impact device is not impacted and is subsequently impacted, effective noise reduction can be obtained, and operation that effectively protects the device is possible. A device with a support unit was obtained.

[Brief description of drawings]

FIG. 1 is a schematic side view of a supporting vehicle having a device including a hydraulic hammer and a supporting unit according to an embodiment of the present invention, and FIG. 2 is a schematic side view of a supporting vehicle including a hydraulic hammer and a supporting unit. FIG. 3 is an enlarged schematic side view of the apparatus according to the first embodiment of FIG. 3, and FIG. 3 is a sectional view taken along line III-III of FIG. 1 ... hitting bit, 2 ... hitting hammer, 3 ... support unit,
4 ... Connection member, 5 ... Jib, 6 ... Supporting vehicle, 7 ... Main arm, 8 ... Main girder, 9 ... Hydraulic device, 10 ... Hydraulic cylinder, 11 ...
Extension arm, 12, 13 ... Hydraulic cylinder, 14 ... Ground, 16 ... Side wall, 17 ... Flange, 18 ... Bush, 19 ... Hole, 20 ... Pin, 21
... tightening pins, 23 ... longitudinal or main center plane, 24 ... cross-section center plane, 25 ... cylinder, 26 ... striking piston, 27 ... through hole, 28 ... shoulder, 29 ... extension, 30 ... support, 31 ... Cushioning element, 32 ... sound deadening cover, 33, 34 ... opening, 35 ... tube, 36 ... bent part, 37 ... sound deadening mat

Claims (7)

[Claims] 1. A device comprising a supporting unit (3) and a striking device (2) arranged inside the supporting unit (3), wherein a sound deadening means is provided in the striking device (2). The striking device (2) is coupled to the supporting unit (3) via an elastic cushioning element (31) acting upward in the axial direction of the striking device (2) and in a direction orthogonal to the axial direction. Which has a piston (26) capable of translational movement in the cylinder (25) toward the anvil-shaped tool (1), (a) the support unit (3) is a pin It has two side walls (16) connected to each other only by (20), and (b) is provided with a number of pairs of components, each pair of these pairs of components being Each of the at least partially cylindrical components Be formed by the pin (20), the other component (27)
Are respectively configured as hollow cylinders as constituent parts of the striking device (2), and (c) the pin (20) as one constituent element of the pair of constituent elements and the other constituent element (27). , Striking device (2)
Has a central axis that lies in a plane that extends in a direction orthogonal to the axis of, and (d) the pin (20) as one component and the other component (27) are driven by the device. At all forces generated between the striking device (2) and the support unit (3) when hit, by a shock-absorbing element (31) fixed to the pair of components in a form-fitting or friction-fitting manner. Device comprising a striking device and a support unit, characterized in that it is also held axially below the device (2) at a distance. 2. The support unit (3) has only two pairs of components, the other component (27) of each pair of these two pairs of components being the striking device (2). A device according to claim 1, which is constructed in a casing. 3. The cushioning element (31) is vulcanized and bonded to at least one of the pair of components (20, 27).
The device according to the item. 4. The cushioning element (31) is bonded to at least one of the pair of constituent elements (20, 27) by an adhesive, respectively.
The apparatus according to item 2 or item 3. 5. A damping element (31) having a steel sleeve (49) fixed to a surface provided for contacting a pair of components (20, 27), respectively. The apparatus according to item 1 or 2. 6. A device according to claim 1 or 2, characterized in that the striking device (2) is surrounded by a covering (32) of sound deadening material over the entire distance between the side walls (16). 7. Device according to claim 1 or 2, characterized in that the inside and / or outside of the side wall (16) is covered by a sound deadening material.