KR101451259B1 - Assembling method of long-bolt for hydraulic breaker - Google Patents

Abstract

The present invention is to combine a long bolt, which joins each element of a hydraulic breaker, to a main body of the hydraulic breaker before cooling after being heated in a stove, and apply torque to the long bolt to avoid release of the long bolt. According to the present invention, the manufacturing method of a long bolt for a hydraulic breaker includes the steps of heating a long bolt at 70-95°C after putting the long bolt into a stove; penetrating a cylinder, which is the main body of the hydraulic breaker, a front head, and a head cap with the heated long bolt; and applying torque to the long bolt for joining the same using a fixing nut.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt for a hydraulic breaker,

The present invention relates to a method of assembling an elongated bolt for a hydraulic breaker, in particular, an elongated bolt for fastening the respective components of a hydraulic breaker is heated in a furnace, and then the heated elongated bolt is fastened to the main body of the hydraulic breaker The present invention relates to an improved method for assembling a long bolt for a hydraulic breaker to prevent a loosening of a long bolt by applying a tightening torque.

Generally, a hydraulic breaker is widely used for crushing concrete or rocks by attaching to a construction machine such as an excavator or a loader. The hydraulic breaker is a hydraulic breaker, So that the concrete and the rock are crushed by the impact force.

1 and 2, a front head 20 is disposed below a cylinder 10 forming a main body of the breaker, and a head cap 30 is mounted on an upper portion of the cylinder 10, And is fastened integrally with the long bolt 50 through the fixing nut 60. [

The piston 15 is installed in the cylinder 10 and is part of both ends of the piston 15 so as to be reciprocable to the front head 20 and the head cap 30 provided at both ends of the cylinder 10 respectively.

The cylinder 10 and the front head 20 are connected by a connecting pin 45.

The front head 20 is provided with a chisel for crushing and crushing a rock or concrete structure. The chisel is reciprocally moved reciprocally with the upward and downward movement of the piston 15 to reciprocate the rock and concrete. .

The cylinder 10 has a structure in which the front head 20 and the head cap 30 are fastened together and the front head 20 and the front head 30 are assembled into a single unit. The long bolt 50 fixed to the base 20 is fastened.

The long bolt (50) is integrally formed with a bolt integrally with both long end portions of the cylinder (10) and through holes formed in the respective heads. One end of the long bolt 50 is loaded in the front head 20 and fastened and fixed by a fixing nut 60 and the other end is fastened and fixed by a fixing nut from the outside of the head cap 30. [

Prior art related to the bolt of the hydraulic breaker is disclosed in Korean Registered Patent Publication No. 10-1193912 entitled " Hydraulic Breaker with Long Bolt Prevents Damping and Displacement "(registered on October 17, 2012) A cap and a front head on which a cylinder and a striking chisel are mounted are assembled in order, and then a plurality of long bolts are used to connect the above components in an integrated state, so that vibration or shock A pair of dampers for preventing the upper end portion of the long bolt from being damped on the inner circumferential surface of the bolt hole of the head cap and a pair of dampers for preventing the upper end portion of the long bolt from being damped so as to induce line contact when the hydraulic breaker is operated by vibration or impact And a fixing nut formed in a cylindrical shape and provided with a movement preventing end for preventing movement to the lower side due to the upper loosening of the long bolt, Thereby preventing breakage and eccentricity of the long bolt.

Another prior art related to the bolt is disclosed in Korean Patent Laid-Open Publication No. 10-2013-0021568 entitled " Positioning device for a hydraulic breaker "(published on Mar. 03, 2013) And a case which is inserted into and supported by the main body of the hydraulic breaker. The apparatus includes a coupling hole formed symmetrically to the case, A pressing member which is coupled to the engaging means and is inserted into the case and which is in contact with the outer surface of the main body at the outer side thereof and is engaged with the engaging hole at both sides of the engaging means, And the first and second bushings are brought into close contact with the end portions. As the bolt is tightened by the engagement means, So that the body can be kept in a fixed state by being brought into close contact with the inner surface of the case.

Conventional bolts for hydraulic breakers are often subjected to loosening phenomenon in which the bolts are easily loosened by an external shock or vibration, so that it is troublesome to carry out re-torque work for fastening from time to time, and in case of loosening, May occur.

Korean Registered Patent Publication No. 10-1193912 entitled "Hydraulic Breaker Preventing Damping and Displacement of Bolts" (Registered on October 17, 2012) Korean Patent Laid-Open Publication No. 10-2013-0021568 entitled "Positioning device for hydraulic breaker" (Published date: March 3, 2013)

SUMMARY OF THE INVENTION It is an object of the present invention to provide an improved hydraulic breaker for minimizing the occurrence of loosening of a bolt and a fixing nut by improving the assembling method of a hydraulic bolt for a hydraulic breaker, And a method of assembling the bolt.

According to an aspect of the present invention, there is provided a hydraulic breaker comprising: a hydraulic breaker body; a hydraulic breaker body;

The long bolt is charged into a heating furnace and heated in a heating furnace,

After the heated long bolt is taken out from the heating furnace,

The fastening bolt is passed through the cylinder, the front head and the head cap before the long bolt drawn out in the heating furnace is cooled to room temperature, and a tightening torque is applied to fasten the end bolt with the fastening nut ,

And the annealed long bolt is cooled to minimize the loosening of the long bolt.

Preferably, when the long bolt is heated in a heating furnace, the long bolt is heated to have a temperature of 70 to 95 캜.

When the fastening torque is applied to the long bolt, it is preferable to assemble with a torque of 150 to 400 kg / cm 2.

In the present invention, a long bolt for fastening a main body of a hydraulic breaker is heated so as to cause a change in length in a heating furnace, and then a tightening torque is applied before cooling, thereby suppressing the loosening of the long bolt that integrally connects the main body Lt; / RTI >

1 is an exploded perspective view of a conventional hydraulic breaker.
Fig. 2 is a view showing a state of engagement of a conventional hydraulic breaker. Fig.
3 is a flow chart sequentially showing a method of assembling an elongated bolt for a hydraulic breaker according to the present invention.
FIG. 4 is a view showing a configuration in which a long bolt and a fixing nut according to the present invention are divided into parts. FIG.
5 is a view showing the main body of the hydraulic breaker of the present invention.

The present invention relates to a hydraulic breaker, which is heated in a heating furnace after fastening bolts to fasten the respective components of a hydraulic breaker, and torque is applied to fasten the main body of the hydraulic breaker by using heated long bolts to minimize loosening of the long bolt .

3 to 5, the method of assembling a long bolt for a hydraulic breaker according to the present invention is characterized in that the long bolt 50 is charged into a heating furnace and then heated (S1), and the heated long bolt 50 is heated The front head 20 and the head cap 30, which are the main bodies of the hydraulic breaker, are heated to a predetermined temperature before the long bolt 50 in the heated state is cooled to room temperature (S3) so as to fasten the fixing nut (60) to the end of the long bolt (50).

More specifically, it is preferable to heat the elongated bolt 50 to a temperature in the furnace at an average temperature of 70 to 95 DEG C for about 8 to 15 hours.

The tightening torque for assembling the hydraulic breaker is for fastening the fastening portion of the long bolt 50 and the fastening nut 60, and is preferably fastened with a force of 150 to 400 kg / cm 2.

When the tightening torque is less than 150 kg / cm 2, the fastening force of the long bolt 50 and the fixing nut 60 is not released and the clamping force can not be compensated for. Thus, when the force exceeds 400 kg / Excessive torque may cause wear and breakage.

The length of the long bolt 50 is varied mainly in the longitudinal direction during the heating operation of the heating furnace, and the cylinder 10, the front head 20, etc., corresponding to the main body, do.

The heating furnace is preferably configured in the form of an oven for uniform heating of the entire area of the hydraulic breaker. For example, a paint drying furnace for drying the paint can be adopted.

The entire method of assembling the hydraulic bolt for a hydraulic breaker is assembled from the top to the bottom in the order of the head cap 30, the cylinder 10, and the front head 20 at room temperature. The other end of the elongated bolt 50 is partially inserted into the front head 20 and is inserted into the loading hole exposed to the outside through the fixing nut 60 And has a fastening structure to be fastened.

The heating conditions of the elongated bolt 50 are transferred to the oven-type heating furnace and then heated by the previously described heating conditions (heating at 70 to 95 ° C for 8 to 15 hours).

After the heating bolt is assembled to integrate the main body of the hydraulic breaker, the long bolt is slowly cooled again at room temperature, and tightening torque is applied to the fixing nut 60 by tightening the fixing nut 60 before cooling to room temperature .

That is, in the method of assembling a long bolt for a hydraulic breaker according to the present invention, the head bolt 30, the cylinder 10, the front head 20 The long bolt 50 and the fixing nut 60 are fixed to each other by using a length and a volume change according to a thermal change by cooling the long and hardened bolts 50 at a normal temperature after they are assembled with a hydraulic breaker, Can be suppressed.

On the other hand, the extended length of the long bolt 50 and the fixing nut 60 after heating can be measured for each part as shown in FIG. 4, and the variation data for each part is shown in Table 1 below.

 (Unit: mm) S / N
Dimensions before heating Dimensions after heating Fluctuating mean value One 2 3 4 One 2 3 4


SPEC


1077 A 1077.42 1077.74 1077.52 1077.56 1078.30 1078.36 1078.42 1078.54 0.85 Φ52 B 52.01 52.01 52.04 52.01 52.07 52.08 52.08 52.07 0.06 Φ36 C 36.02 36.01 36.02 36.02 36.05 36.04 36.05 36.05 0.03 Φ36 D 36.01 35.98 36.01 36.01 36.04 36.03 36.04 36.03 0.03 60 E 60.03 59.78 60.00 60.05 60.16 59.84 60.06 60.11 0.08 12 F 11.98 12.02 12.04 12.01 12.02 12.01 12.06 12.04 0.02 62 G 62.07 62.03 62.05 62.09 62.10 62.07 62.11 62.10 0.04

As shown in Table 1, it can be seen that the length of each part increases after heating Ser 'No 1, 2, 3, 4 long bolts 50.

After heating at room temperature or heating furnace, the amount of rotation for fastening the long bolt (50) and the fixing nut (60) by measuring the tightening torque is described as shown in Table 2.

(Unit: mm)
250 kg / cm 2 300 kg / cm 2 One 2 3 4 total One 2 3 4 total Room temperature / tightening torque One 3.5 1.9 1.4 7.8 0.4 2.9 3 0.5 6.8 Heating furnace heating / tightening torque 0 0 0.65 0.6 1.25 0.6 0.5 3.5 0.5 5.1

As shown in Table 2, the amount by which the fastening torque is applied after the heating in the heating furnace is rotated at the time of fastening the long bolt 50 and the fastening nut 60, rather than the fastening at a normal temperature when the fastening torque is applied .

The releasing torque of the hydraulic breaker after completion of the assembling process requires a greater torque force than that at the existing room temperature, thereby minimizing the loosening phenomenon of the long bolt 50 and the fixing nut 60 .

10: cylinder 15: piston
20: front head 30: head cap
50: Long bolt 60: Fixing nut

Claims (3)

The front head 20 is coupled to one end of the long bolt 50 while the long bolt 50 is passed through the cylinder 10 in the longitudinal direction of the hydraulic breaker body and the head cap 30 is fastened A method of assembling an elongated bolt for a hydraulic breaker,
The long bolt (50) is charged into a heating furnace and heated in a heating furnace,
After the heated long bolt 50 is taken out from the heating furnace,
The long bolt 50 is passed through the cylinder 10 and the front head 20 and the head cap 30 before the long bolt 50 drawn in the heated state is cooled to room temperature, Tightening torque is applied to the end of the bolt 50 so as to be fastened with the fixing nut 60,
Wherein the heated long bolt (50) is cooled to minimize the loosening of the long bolt (50). The method according to claim 1,
Wherein the long bolt (50) is heated to have a temperature of 70 to 95 占 폚 when the long bolt (50) is heated in a heating furnace. The method according to claim 1,
Wherein when the fastening torque is applied to the long bolt (50), the fastening bolt is assembled with a torque of 150 to 400 kg / cm 2.

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