KR20090053522A - Breaker for a excavator - Google Patents

Abstract

The present invention relates to an excavator breaker.

Excavator breaker of the present invention, the cylinder assembly; A piston coupled to the cylinder assembly; A rod extending outward after being coupled to the same axis as the piston inside the cylinder assembly; An outer circumferential surface is in contact with the inner circumferential surface of the cylinder assembly, and a tubular sound-absorbing member in which both sides of the inner circumferential surface are in contact with each outer circumferential surface of the piston and the rod; And a front cover having inner and outer circumferential surfaces in contact with the outer circumferential surface of the rod and the inner circumferential surface of the lower end of the cylinder assembly, respectively.

In the excavator breaker of the present invention, the outer circumferential surface of the tubular sound-absorbing member is in close contact with the inner circumferential surface of the cylinder assembly, and both sides of the inner circumferential surface are in close contact with the outer circumferential surfaces of the piston and the rod, thereby effectively absorbing vibration and noise at the moment of impact.

Excavators, Breakers, Rods, Chisels, Pistons

Description

Breaker for a excavator

The present invention relates to an excavator breaker, and more particularly, in an excavator breaker used for hitting a shredding object during civil works such as dismantling an aging structure or digging a hard floor, a rod (or " The piston is provided with an outer circumferential surface in contact with the inner circumferential surface of the piston and a tubular sound-absorbing member having both sides of the inner circumferential surface contacting each of the outer circumferential surfaces of the piston. An excavator breaker is provided to reduce noise and vibration generated during a strike.

Excavators are widely used in various demolition works such as demolishing old buildings for reconstruction or digging roads for underground laying, or construction and civil works. Excavators are as follows.

Excavators have many types such as shovel excavators, bulldozers, scrapers, etc .. The most widely used excavators are shovel excavators, which are equipped with a cab and an engine, and have a rotatable body with a slightly bent central portion. Bar-shaped boom is rotatably coupled, the arm is rotatably coupled to the outer end of the boom, the bucket is coupled to the outer end of the arm structure, digging the ground using a bucket, or excavated soil or stone You will have your back.

However, cement or asphalt road, which is harder than soil, cannot be dug into a bucket, and after the bucket is separated, the breaker is used to connect the outer end of the arm to which the bucket is coupled. The breaker is as follows.

At this time, assuming that the breaker is standing on the floor, the location and direction of each component of the breaker will be described.

As shown in FIG. 1, the breaker 1 includes a cylinder assembly 11, a piston 12 coupled to an upper portion of the cylinder assembly 11, and a piston 12 below the cylinder assembly 11. It is configured to include a rod 13 and the like protruding outward through the lower end of the cylinder assembly 11 after being inserted and coupled.

The cylinder assembly 11 is divided into three upper, middle, and lower portions of the back head 11A, the back head, the cylinder 11B, and the front head 11C, and the front head 11C. In the state built in 11B), the upper and lower ends protrude to the back head 11A and the front head 11C, respectively, but have a longer length of the piston 12 protruding to the front head 11C.

In addition, a hydraulic chamber R for operating the piston 12 is provided in the back head 11A, and the rod 13 is inserted under the piston 12 in the front head 11C. As a structure projecting downward through the lower end of 11C), the piston 12 is moved upward and downward by the hydraulic pressure of the hydraulic chamber R to strike the upper end of the rod 13.

The breaker (1) is coupled in the connecting housing (2) of the shape as shown in Figure 2, the outer end of the excavator arm is coupled to the coupling pin (P) provided on one side of the connecting housing (2) so as to be separated By doing so, it becomes a state which can be used by an excavator.

In the case of hitting the crushed object using the breaker having the structure described above, one of the biggest problems is the noise, which is inevitably caused because the metal piston hits the rod of the metal material, and the magnitude of the noise If the construction site using a breaker is close to a place where there are many people, such as a residential area or a shopping mall, there is a problem that causes a great deal of discomfort to people and daily life or work.

Therefore, various methods have been tried to improve the structure of the breaker to reduce the noise generated when the breaker is used. In the Korean Utility Model No. 388978, "Vibration Cover for Hydraulic Strike Device" is published. Polyurethane dust cover having a rectangular tube shape is coupled between the inner surface of the connecting housing and the outer surface of the cylinder assembly. Since the dust cover covers only the lower part of the cylinder assembly, the noise shielding effect spread through the entire cylinder is small.

In addition, a "low noise type hydraulic breaker" is posted in Korean Utility Model No. 434268. A hollow is formed along the axial direction in the center of the piston, and a sound absorbing material is inserted into the hollow, and the noise of the piston and the rod is hit. Excessive vibration may be somewhat absorbed by the flaw material of the piston hollow, but the effect is inevitably small because the sound absorbing material is filled only in the hollow having a relatively smaller diameter than the piston.

In addition, there is a structure to reduce the blow noise by interposing a ring-shaped sound-absorbing member between the cylinder assembly inner peripheral surface and the rod outer peripheral surface, and between the cylinder assembly inner peripheral surface and the piston outer peripheral surface, but such a structure is the site where the rod and piston strikes, That is, there is a disadvantage in that the impact noise transmitted through the wall of the cylinder assembly positioned between the upper and lower two sound absorbing members cannot be reduced.

The present invention has been made to solve the problems of the low efficiency of the conventional noise reduction structure applied to the excavator breaker to reduce the hitting noise, which can effectively reduce the noise and vibration of the piston hitting moment to the rod It is an object of the present invention to provide an excavator breaker of construction.

The above object of the present invention is achieved by a tubular sound-absorbing member in which stepped portions are formed on the inner circumferential surface due to different inner diameters of both sides.

And it is achieved by the front cover as a ring-shaped auxiliary sound absorbing member which is inserted and coupled to the inner peripheral surface of the lower end of the cylinder assembly, the inner diameter gradually decreases from the outer end toward the inner side.

In the excavator breaker of the present invention, the inner peripheral surface of the tubular sound-absorbing member is completely in contact with the outer peripheral surface of the upper end of the rod and the outer peripheral surface of the lower end of the piston, so that the vibration and noise generated at the moment of impact are effectively absorbed by the flaw member.

Since the outer circumferential surface of the sound absorbing member is in close contact with the inner surface of the cylinder assembly in which the piston strikes, the magnitude of the blow vibration and the blow noise transmitted to the outside through the pipe wall of the cylinder assembly is minimized. There is an advantage that can lower the discomfort due to the noise by lowering the blow sound by the air that is.

In addition, the front cover as a ring-shaped auxiliary sound absorbing member having an axially inclined surface is coupled to the inner circumferential surface of the lower end of the cylinder assembly so that the contact area between the inner circumferential surface of the auxiliary sound absorbing member and the rod outer circumferential surface is enlarged. There is an advantage that can effectively absorb the impact noise and the vibration to be transmitted to the outside.

Excavator breaker of the present invention is to reduce the noise damage that can be caused during the work by reducing the noise generated when using the breaker, there is a technical feature in the internal diameter structure of the sound absorbing member coupled to the impact portion in the cylinder assembly .

The term "hit part" means a specific part in the cylinder assembly in which the piston strikes the rod by the reciprocating motion of the piston.

The description of the up and down directions for each component of the breaker used in the following description is based on the state in which the breaker stands on the floor.

Excavator breaker of the present invention, the cylinder assembly; A piston inserted into the cylinder assembly; A rod which is inserted under the piston in the cylinder assembly and protrudes outward through the lower end of the cylinder assembly; A tubular sound-absorbing member having an outer circumferential surface in contact with an inner circumferential surface of the cylinder assembly, and an inner circumferential surface both sides (or upper and lower portions) contacting (or approaching) the inner circumferential surface of the rod upper portion and the lower piston portion, respectively; And the like.

Excavator breaker of the present invention configured as described above, the technical features of the present invention in the inner diameter structure of the tubular sound-absorbing member coupled to the striking portion in the cylinder assembly, look at this as follows.

The tubular sound-absorbing member has a shape of a tubular body having a hollow penetrating along the axial direction, and is made of a material having elastic force while absorbing noise and vibration well, such as urethane and rubber.

The outer circumferential surface of the tubular sound absorbing member is in contact with the inner circumferential surface of the cylinder assembly, the upper inner circumferential surface is in contact with or close to the lower outer circumferential surface of the piston, and the lower inner circumferential surface is in intimate contact with the upper outer circumferential surface of the rod. The lower inner diameter of the sound absorbing member is smaller than the upper inner diameter of the sound absorbing member in contact with the lower outer circumferential surface of the piston, and a ring-shaped stepped portion is formed along the circumference of the inner circumferential surface of the sound absorbing member.

In addition, the upper inner diameter of the sound absorbing member having an inner circumferential surface in contact with or adjacent to the outer circumferential surface of the piston is equal to or larger than the piston diameter but is 110% or less of the piston diameter, and the lower inner diameter of the sound absorbing member in contact with the outer circumferential surface of the rod is equal to the diameter of the rod. Smaller than 90% of rod diameter.

The reason for limiting the inner diameter of the sound absorbing member as described above is that, when the inner diameter of the sound absorbing member is larger than 110% of the piston diameter, the gap between the inner circumferential surface of the sound absorbing member and the outer circumferential surface of the piston is excessively widened, so as to absorb the blow noise and the impact vibration of the piston. This is because when the inner diameter of the sound absorbing member is sharply lower than the piston diameter, the sound absorbing member can be easily damaged by the up / down reciprocating motion of the sound absorbing member.

If the inner diameter of the sound absorbing member is larger than the diameter of the rod, the inner circumferential surface of the sound absorbing member does not come into close contact with the outer circumferential surface of the rod, so that it is hard to absorb the vibration of the rod due to the impact of the piston as well as the blow noise. If less than 90%, it is difficult to insert the rod into the inner diameter of the sound absorbing member.

Of course, the inner diameter of the sound absorbing member may be less than 90% of the rod diameter, and the inner diameter of less than 90% may be possible as long as the rod can be firmly supported without being damaged when the rod is inserted.

As described above, the ratio of the diameters of the piston and the rod to the inner diameter of the sound absorbing member is different from that of the piston, when the piston strikes the rod, the piston reciprocates in the up and down directions to strike the rod, while the rod is connected to the piston. This is because the upper and lower positions in the cylinder assembly are almost fixed while only delivering the amount of impact applied by the impact object.

That is, when the upper inner diameter of the sound absorbing member is smaller than the diameter of the piston, the flaw member may be easily deformed and damaged by repeated upward and downward reciprocating motions of the piston while the friction force between the piston and the sound absorbing member rises more than necessary.

However, since the rods are almost fixed in the up and down positions, there is little risk of deformation or damage even when the lower inner diameter of the sound absorbing member is smaller than the diameter of the rod.

Details of the effects and the resulting effects, including the object and technical configuration of the present invention will be clearly understood by the following description with reference to the drawings showing a preferred embodiment of the present invention.

3 is a partial open cross-sectional structural view of an embodiment breaker of the present invention, and FIG. 4 is a perspective view and a cross-sectional structural view of a sound absorbing member constituting an embodiment of the present invention breaker.

As shown the excavator breaker of the present invention,

A cylinder assembly (21) having a hollow (H) that is open in one axial direction therein;

A piston (22) coupled to the cylinder assembly (21) such that up and down reciprocation is possible;

A rod (23) coupled to the same axis as the piston below the piston (22) in the cylinder assembly (21) and extending downward through the lower end of the cylinder assembly (21);

An outer circumferential surface is in contact with the inner circumferential surface of the cylinder assembly 21, and a tubular sound-absorbing member 24 is formed in which the inner circumferential surfaces of both sides in the axial direction, that is, the upper and lower inner circumferential surfaces, respectively contact the lower circumferential surface of the lower portion of the piston 22 and the rod 23. )Wow;

A ring-shaped or tubular front cover 25 as an auxiliary sound absorbing member in which the outer circumferential surface and the inner circumferential surface contact the inner circumferential surface of the lower end portion of the cylinder assembly 21 and the outer circumferential surface of the rod 23, respectively; And the like.

Unexplained symbols, "21A", "21B", "21C", "25", "A" and "V" are "backhead", "cylinder", "fronthead", accumulator "and" Valve ".

In the breaker of the present invention configured as described above, the sound absorbing member 24 may be made of one body, but as shown in FIG. 4, the upper inner portion 24A and the inner circumferential surface having the same inner diameter along the axial direction. It may be manufactured separately by the lower portion 24B having the stepped portion, and may be manufactured by separating the upper part with the larger inner diameter and the lower part with the lower inner diameter based on the stepped part. May be

Of course, even when the sound absorbing member 24 is manufactured separately, the cylinder assembly 21 is coupled to be in close contact with each other along the axial direction.

In addition, the sound absorbing member 24 and the cylinder wall of the cylinder assembly 21 positioned between the upper and lower dead centers (not shown) of the piston are preferably provided with at least one through hole h passing through the pipe wall. h) serves as a passage through which the air compressed between the piston and the rod and the sound absorbing member is discharged to the outside when the piston 22 descends from the top dead center to the bottom dead center.

In this case, when the through hole (h) is formed at the same position as the bottom dead center of the piston 22, the internal air can be completely discharged when the piston descends, but the through hole (h) is the bottom of the piston 22 It may be more desirable to locate higher than the point.

This allows the air compressed by the piston to be first discharged through the through hole h, and then the air remains between the piston, the rod and the sound absorbing member, and the remaining air that is not discharged is compressed again by the piston. This is because the noise can be reduced by the compressed air when the rod is hit, and at the same time, the hitting sound can be lowered.

In the excavator breaker of the present invention configured as described above, the diameters of the piston 22 and the rod 23 respectively inserted into the upper and lower inner diameter portions of the sound absorbing member 24 are referred to as "D _P " and "D _R ", respectively. and, when the La "d _P" and "d _R" each correspond to the upper and the lower internal diameter of the sound-absorbing member 24 "d _P '" that in and "d _R'" inner diameter of the sound-absorbing member 24 is then mathematics Equations 1 and 2 are satisfied.

In the excavator breaker of the present invention as described above, the piston is hit against the rod in the state that each outer peripheral surface of the piston and the rod in contact with the inner peripheral surface of the tubular sound-absorbing member, the cylinder located within the reciprocating displacement of the piston bottom surface Since the entire outer circumferential surface of the sound absorbing member is also in contact with the entire inner circumferential surface of the assembly, the vibration and noise during the impact are immediately absorbed into the flaw member immediately.

However, both the vibration and the noise at the time of hitting may not be absorbed by the sound absorbing member. As shown in FIG. 5, at the lower end along the axial direction to the outer circumferential surface of the rod 23 in close contact with the inner circumferential surface of the front cover 25. It is also preferable to form an inclined portion S whose diameter gradually decreases toward the upper end side.

That is, the outer circumferential surface of the rod 23 corresponding to (or contacting) the inner circumferential surface of the front cover 25 by expanding the portion of the rod 23 projecting out of the cylinder assembly 21 rather than the diameter of the portion located in the cylinder assembly 21. An axial inclined surface is formed in the

And by forming the inclined portion (S) to be mated with the axial inclined surface of the rod on the inner peripheral surface of the front cover 25, the adhesion between the outer peripheral surface of the rod 23 and the inner peripheral surface of the front cover 25 can be further increased, The repulsion force can prevent the rod from being excessively inserted into the cylinder assembly more effectively, and can enlarge the contact surface between the rod and the front cover. It is possible to absorb noise more effectively.

In this case, the entire inner circumferential surface of the front cover 25 may be formed as an inclined surface, or an axial flat portion having a constant diameter may be extended upward from the upper end of the inclined portion in a state in which the inclined portion is formed by a predetermined length from the lower end of the inner circumferential surface.

Table 1 shows the results of measuring the noise generated during the excavation work using the breaker and the conventional breaker of the present invention as described above.

      division     Noise (dB)   Invention breaker      73-76   Conventional breaker      92-96

Breaker of the present invention, compared to the conventional breaker as shown in Table 1 above was shown to reduce the noise by more than 20%.

Although not measured, the noise generated during the excavation was reduced from high to low, that is, the frequency of the noise was reduced, thereby reducing the discomfort caused by the noise.

1 is a cross-sectional structural view of a conventional excavator breaker.

2 is a perspective view of a connecting housing for connecting a breaker to an excavator;

Figure 3 is an internal structure diagram of a breaker of the first embodiment of the present invention.

Figure 4 shows the sound absorbing member constituting the first embodiment breaker of the present invention,

  (A) is a perspective view,

  (B) is sectional drawing.

5 is a partial cross-sectional structural view of a breaker according to a second embodiment of the present invention.

         ((Explanation of symbols for main part of drawing))

            10. Excavator 10A. cancer

            21. Cylinder assembly 22. Piston

            23. Rod 24. Sound absorption member

            25. Front cover h. Through

H. Hollow D _P. Piston diameter

D _R. Rod diameter S. Slope

Claims (8)

A cylinder assembly; A piston coupled to the cylinder assembly; An excavator breaker comprising a rod coaxially with the piston under the piston in the cylinder assembly and including a rod extending out of the cylinder assembly, The cylinder assembly (21), the piston (22) and the rod (23); An outer circumferential surface is in contact with the inner circumferential surface of the cylinder assembly 21, and a sound absorbing member 24 having upper and lower inner circumferential surfaces in contact with each outer circumferential surface of the lower portion of the piston 22 and the rod 23; Excavator breaker, characterized in that configured to include. According to claim 1, wherein the lower end of the cylinder assembly 21, Excavator breaker, characterized in that the outer circumferential surface is in contact with the inner circumferential surface of the lower end of the cylinder assembly 21, the front cover 25, the inner circumferential surface is in contact with the outer circumferential surface of the rod (23). The inner peripheral surface of the front cover 25, Excavator breaker, characterized in that the inclined portion (S) is formed to gradually decrease the inner diameter along the axial direction. The excavator breaker according to claim 3, wherein the outer circumferential surface of the load (23) in contact with the inner circumferential surface of the front cover (25) gradually decreases in outer diameter from the lower end to the upper end in the axial direction. The upper inner diameter of the sound absorbing member 24 which is in contact with the lower outer peripheral surface of the piston 22 is not smaller than the lower outer diameter of the piston 22, Excavator breaker, characterized in that the lower inner diameter of the sound absorbing member 24 which is in contact with the upper outer peripheral surface of the rod 23 is not larger than the upper outer diameter of the rod (23). The method of claim 5, wherein the sound absorbing member 24, An excavator breaker, which satisfies Equations 1 and 2 below. Equation 2

In the equation, D _P is the diameter of the piston is inserted into the sound absorbing member, D _R is the diameter of the rod to be inserted into the sound absorbing member, D _P 'is a sound-absorbing member inside diameter of the portion where the piston is inserted, D _R' is to be loaded is inserted, Sound absorbing member inner diameter of site. The method of claim 1, wherein the sound absorbing member 24, Excavator breaker, characterized in that the upper inner diameter is larger than the lower inner diameter. The tube wall of the sound absorbing member 24, Excavator breaker, characterized in that provided with a through-hole (h) for exhausting air through the pipe wall.

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