KR101575059B1 - Spring and compressed gas type breaker - Google Patents

Abstract

The present invention relates to a spring and compressed gas type-breaker having an improved structure allowing a piston to reciprocally be elevated by a compressed gas, not a hydraulic pressure, a spring, and a cam, to prevent a leakage of oil; and also having a simple structure to increase productivity and reduce manufacturing costs. The spring and compressed gas type-breaker comprises: a breaker main body; a spring member; a drive motor; and a cam member. The breaker main body comprises: a gas chamber filled with the compressed gas, and positioned on an upper part of a cylinder; the piston arranged on an interior of the cylinder to be elevated; and a chisel arranged on a lower side of the piston. The spring member is wound on an upper part of the piston, and supported by a lower surface of the gas chamber to apply a downward elastic force to the position. The drive motor is arranged on the interior of the cylinder, and is driven by an external power source. The cam member is connected to the motor shaft of the drive motor and is interlocked by the drive of the drive motor as it rotates which lifts the lower part of the piston when the cam member is rotated.

Description

[0001] SPRING AND COMPRESSED GAS TYPE BREAKER [0002]

[0001] The present invention relates to a spring and a compressed gas type breaker, and more particularly to a spring and a compressed gas type breaker, in which a piston is reciprocated upwardly and downwardly by a cam driving system including a gas pressure of a compressed gas and a restoring elastic force of a spring, And more particularly to a spring and compressed gas-type breaker whose structure is improved to provide a striking force.

In general, hydraulic breakers are installed on the arm of an excavator instead of a bucket, and are used for crushing rocks and piling in civil engineering works and building foundation works.

Hydraulic and compressive gas powered pneumatic breakers are devices that perform hundreds of blows per minute and deliver the hitting power repeatedly to the structure each time it hits.

The operation of the breaker mounted on the excavator is such that when the worker first operates the boom bar of the excavator and presses the foot switch in contact with the crush object with the chisel of the breaker to turn on the hydraulic pressure supply device, As a result, the impact piston reciprocates and strikes the chisel, thereby crushing the object to be crushed.

1, a general hydraulic breaker includes a main body 100 on which a piston 200 is installed, a front head 500 and a front head 500 coupled to the lower side of the main body 100 with bolts, And a through hole through which the chisel 600 is inserted is formed in a lower portion of the front head 500.

The valve channel hole connects the valve inner chamber connected to the cylinder upper chamber 110 alternately to the valve high pressure chamber or the valve low pressure chamber in accordance with the upward or downward movement of the valve 310 built in the valve housing 300, And alternately supply and operate high-pressure and low-pressure operating fluids.

That is, the supply of the flow rate of the operating fluid is variably supplied to the cylinder-lowering chamber 110 through the first flow path 142, and the flow rate of the hydraulic fluid is continuously supplied to the cylinder chamber 120 through the third flow path 146 together with the accumulator 400 do.

The piston 200 is raised by the high pressure always acting on the cylinder bore 120 and the high pressure acts on the valve switching chamber through the cylinder switching chamber to which the second flow path 144 is connected before the piston 200 reaches the vicinity of the top dead center And the valve is raised.

When the valve is elevated, a high-pressure flow path connected to the valve high pressure chamber, the valve flow passage, the valve inner chamber, and the cylinder inner chamber 110 is formed And high pressure acts on the upper and lower ends of the piston 200, respectively.

Since the pressure area of the upper end of the piston 200 is larger than the pressure area of the lower end of the piston 200, the piston 200 is lowered due to the high pressure acting on the upper and lower ends of the piston 200 and the compression gas filled in the cylinder gas chamber 130.

The valve switching chamber keeps the high pressure state since the lower large diameter portion of the piston 200 blocks the cylinder switching chamber from the initial stage to the middle stage of the piston 200. The high- And the high-pressure passage connected to the cylinder-loaded chamber 110 also maintains the high-pressure state, thereby supplying the operating fluid necessary for descending the piston 200. [

When the piston 200 reaches the bottom dead center, the lower large-diameter portion of the piston 200 is lowered downward than the cylinder conversion chamber, and the cylinder conversion chamber, which is closed, is communicated with the cylinder low-pressure chamber.

As a result, the valve switching chamber is switched to the low pressure and the valve is lowered. The piston 200 strikes the upper surface of the chisel 600 at the bottom dead center. At this time, the piston 200, the chisel 600, The mutual hitting force is transmitted, and the piston 200 is repelled immediately after the hitting by the reaction force, and is returned to the upper side.

Since the conventional hydraulic breaker causes extreme vibration due to the crushing operation of the chisel, the outer surface of the hydraulic piston 200, which is installed inside the retainer and is frictioned with each other, is easily worn due to the extreme vibration, As a result, the maintenance cost of the hydraulic piston is increased, and the clearance between the retainer and the hydraulic piston is greatly increased, thereby increasing the leakage amount.

As a prior art, as disclosed in Korean Patent Registration No. 10-0694675, entitled " Device for scratching a piston of a hydraulic breaker "(registered on Mar. 07, 2007), a chisel for hitting an object below the cylinder of a hydraulic breaker A hydraulic piston is provided on the upper side of the chisel so as to apply a striking force to the chisel through a retainer, and a seal for maintaining the hermetic sealing is provided between the retainer and the friction surface of the hydraulic piston through a low- A bushing having an inner friction surface of a retainer in which the hydraulic piston is lifted and lowered inwardly of the cylinder and made of a non-ferrous material having a hardness lower than that of the hydraulic piston; A labyrinth groove formed on the inner surface of the bush installed on the inner friction surface of the retainer to capture foreign matter generated in a gap between the hydraulic piston and the inner surface of the retainer; And a seal portion which is provided behind the bushing integrally formed on the retainer inner friction surface via at least one low-pressure conduit and at least one of the seal portions is provided behind the bushing.

As another prior art of the conventional hydraulic breaker, as disclosed in Korean Patent Registration No. 10-0838310 entitled " Hydraulic Breaker Adjustment Device of Hydraulic Breaker "(Registered Date: 2008.06.09), an inner space extending in the longitudinal direction A valve unit having an oil passage formed on an outer side of the cylinder and through which hydraulic oil supplied from the outside is formed; A front head which is fixed to the front head and has an accommodation space of the same central axis as the inner space of the cylinder; and a front head which is installed in the receiving space of the front head, one end of which extends to the outside of the front head, And a control unit for controlling the operation speed of the piston, A casing provided in the oil passage of the valve unit and provided at an inlet-side flow passage that flows into the valve unit from the outside, has a shape of a hollow pipe and at least one through hole through which oil passes is formed at the periphery of the casing; And a flow rate adjusting member for adjusting the flow rate of the oil flowing into the valve unit by adjusting the degree of opening of the through hole through adjustment of the position with respect to the casing, and a female screw portion is formed on the inner circumferential surface of the casing , The flow rate adjusting member is provided with a male screw portion that is screwed to the female screw portion and a female screw portion which is integrally formed with the male screw portion and moves in the longitudinal direction according to the degree of engagement of the male screw portion to the female screw portion, .

In such a conventional hydraulic breaker, since the hydraulic pressure is selectively provided on the upper and lower sides of the piston, it acts as a force for moving the piston back and forth. However, the structure (oil passage, packing, valve, etc.) And the manufacturing cost is increased.

In addition, when a shock is applied to a packing part due to an impact force caused by left and right shaking generated when a piston is hit by a chisel, the hydraulic breaker causes oil leakage due to deformation or breakage of the packing. Therefore, Which is not only cumbersome but also causes environmental pollution.

Korean Patent Registration No. 10-0694675 "Device for scratching a piston of a hydraulic breaker" (registered on March 7, 2007) Korean Registered Patent No. 10-0838310 entitled " Hydraulic Breaker Regulator "(Registered on June 6, 2008)

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide a reciprocating lifting force to a piston by using a compressed gas, a spring and a cam, And to provide a spring and compressed gas breaker whose structure is improved so as to simplify the structure and reduce the productivity and manufacturing cost.

According to an aspect of the present invention, there is provided a compressor comprising: a breaker body provided with a gas chamber filled with a compressed gas in an upper portion thereof, a piston capable of moving up and down in a cylinder, and a chisel disposed on a lower side of the piston; A driving motor that is disposed inside the cylinder and is driven by an external power source; and a driving motor that is linked to the motor shaft of the driving motor and interlocked by driving of the driving motor, And a cam member for lifting a lower portion of the piston in a rotating operation.

The piston is provided with a latching protrusion protruded outward along the circumference of the outer circumferential surface so that the end of the cam member contacts the cam during rotation of the cam.

The cam member is formed in a structure symmetrical to the left and right with respect to the motor shaft of the drive motor.

The breaker main body is provided with an accommodating portion which is provided so as to communicate with the inside of the cylinder so as to protrude outward on one side so as to receive the cam member and the driving motor.

A cushioning material detachable from the end of the cam member or the lower portion of the piston may be provided.

It is preferable that the cam member further includes a reinforcing member which is integrally coupled to an end portion which is in contact with the piston and has a hardness higher than that of the piston and excellent in abrasion resistance.

According to the present invention, when the cam member is rotated, the piston is lifted in a contact section with the piston. In the non-contact section, the restoring elastic force of the spring member and the downward force of the compression gas, So that it is possible to obtain a lowering force and an upward force by the gas pressure of the compressed gas, the restoring elastic force of the spring member, and the rotational force of the cam member without applying the hydraulic pressure, Not only the manufacturing cost can be reduced but also the oil leakage phenomenon can be effectively prevented.

Further, the present invention has an advantage that the reliability of the product can be improved by improving the durability of parts by providing a cushioning material or a reinforcing material detachable at the end of the cam member or the lower part of the piston.

1 is a block diagram showing a configuration of a conventional hydraulic breaker.
2 is a structural view showing the configuration of a spring and a compressed gas type breaker according to the present invention;
3 is a front view showing a cushioning structure of the cam member and the piston of the present invention.
4 is a front view showing a reinforcing structure of the cam member of the present invention.
Fig. 5 is a state of use when the piston of the present invention is at the top dead center position. Fig.
6 is a state in which the piston of the present invention strikes the chisel when the piston is in the bottom dead center position.

2 through 6, the spring and the compressed gas type breaker according to the present invention are provided with a gas chamber 12 filled with a compressed gas at an upper portion of a cylinder and a piston The hermetic compressor includes a hermetic compressor including a hermetic compressor including a hermetic compressor including a hermetic compressor including a hermetic compressor including a hermetic compressor, A driving motor 40 which is disposed inside the cylinder 15 and is driven by an external power source; a driving motor 40 which is connected to the motor shaft 45 of the driving motor 40, And a cam member (50) interlocked by driving of the motor (40) and rotated to lift the lower portion of the piston (20) in the rotating operation.

2, the breaker main body 10 includes a cylinder 15 in which a piston 20 is embedded, a gas chamber 12 provided on the upper side of the cylinder 15 and having a chamber shape, And a front head 17 in which a chisel 60 is disposed below the cylinder 15. The back head 11 is provided with a cylinder head 15,

A compressed gas is filled in the gas chamber 12, and a nitrogen gas can be employed as the compressed gas.

The breaker main body 10 is formed with a receiving portion 16 which is protruded outward at one side so as to receive the driving motor 40 and the cam member 50 and connected to the inside of the cylinder 15 so as to communicate with the inside thereof.

One end of the spring member 30 is supported by the lower side of the gas chamber 12 and the other end is supported by the piston 20 to give an elastic force to push downward against the piston 20 .

The piston 20 has an engagement protrusion 22 formed on its upper surface so as to be in contact with the lower end of the spring member 30 and protrude along the outer circumferential surface so that the lower surface thereof contacts the end of the cam member 50.

The drive motor 40 may employ a hydraulic motor that rotates the motor shaft 45 as the hydraulic pressure is supplied to rotate the cam member 50.

The cam member 50 is formed in the form of a windmill having a plurality of blades whose left and right sides are symmetrical with respect to the motor shaft 45 of the drive motor 40. [

Here, the cam member 50 may be composed of one blade to be rotated, but in this case, since the speed at which the piston 20 ascends and descends is reduced, it is preferable that the cam member 50 is composed of two to four blades.

Since the end of the cam member 50 which is in contact with the lower side of the engaging shoulder 22 of the piston 20 may be damaged by repetitive impacts, the lower surface of the engaging shoulder 22 Shock absorbing members 72 and 74 may be provided at the ends or both sides of the cam member 50. [

3, the shock absorbing members 72 and 74 absorb or cushion the impact force generated when the cam member 50 and the engaging shoulder 22 are in contact with each other to break the cam member 50 and the engaging shoulder 22 And can be replaced with a different material having abrasion resistance and impact resistance.

4, the cam member 50 is made of a material having a hardness higher than that of the other portion of the cam member 50 and the material of the piston 20 at the end contacting with the engaging jaw 22 in the rotating operation, It is preferable to further comprise a reinforcing member 75 formed.

The reinforcing member 75 may be made of a cemented carbide material so as to have a sufficient rigidity against the impact with the engaging jaw 22 of the piston 20. [

The stiffener 75 may be integrally welded to each blade end of the cam member 50 or may be joined using a separate assembly piece (bolt or the like).

When the hydraulic power source is supplied to the drive motor 40, which is a hydraulic motor, the drive motor 40 is rotationally driven to rotationally drive the cam member 50 coupled to the motor shaft 45 .

Since the cam members 50 are formed so that the blades on both the left and right sides are symmetrical to each other, as the blade ends on both the left and right sides to be rotated are rotated while being in contact with the lower surface of the latching jaw 22, ) In the vertical direction.

That is, according to the present invention, a section in which the blades of the cam member 50 are in contact with the latching jaw 22 of the piston 20 is divided into a contact section, and a section in which the blades are not in contact with the latching jaw 22, In the contact section, the piston 20 is lifted upward as shown in FIG.

At this time, the rotational force of the cam member 50 during the lifting operation of the piston 20 exceeds the elastic force of the spring member 30 and the force of the compressed gas in the gas chamber 12, so that the spring member 30 is contracted, So that the upper end of the piston 20 is advanced into the gas chamber 12.

6, in the non-contact section, the contact state between the cam member 50 of the cam member 50 and the engaging shoulder 22 is released, and the piston 20 is disengaged from the compressed gas in the gas chamber 12 The restoring elastic force F2 generated by restoring the contracted spring member 30 to its original shape is transmitted to the piston 20 so that the downward movement of the spring member 30 is performed downward, The upper end of the chisel 60 is hit.

Therefore, in the present invention, when the cam member 50 is driven to rotate, the piston 20 is lifted in the contact section with the piston 20, and in the non-contact section, the spring member 30 and the downward movement force of the compressed gas, the piston 20 is lowered and struck the chisel 60, so that the gas pressure of the compressed gas and the restoring elasticity of the spring member 30 And a simple structure in which a lowering force and a lifting force can be obtained by the rotational force of the cam member 50. Thus, the manufacturing productivity is improved and the oil leakage phenomenon can be prevented.

The present invention has the technical idea of causing the piston to reciprocate by using the spring member, the compressed gas and the cam member, and can be modified in various ways without departing from the concept and scope of the present invention. For example, the present invention does not limit the coupling structure and the material of the spring member that gives the piston an elastic force, and does not limit the shape of the cam member or the number of the blades.

10: breaker main body 11: back head
12: gas chamber 15: cylinder
16: receptacle 17: front head
20: piston 22:
30: spring member 40: drive motor
45: motor shaft 50: cam member
60: Chisel 72, 74:
75: Stiffener

Claims (6)

A piston 20 in which a gas chamber 12 filled with a compressed gas is provided at an upper portion and a piston 20 capable of moving up and down is disposed inside the cylinder 15 and a chisel 60 is disposed at a lower side of the piston 20 )Wow,
A spring member 30 wound on the piston 20 to apply a downward elastic force to the piston 20,
A drive motor 40 disposed inside the cylinder 15 and driven by an external power source,
And a cam member 50 connected to the motor shaft 45 of the drive motor 40 and linked with the drive motor 40 to rotate and lift the lower portion of the piston 20 during the rotation operation Features spring and compressed gas breaker. The method according to claim 1,
Wherein the piston (20) is formed with a latching jaw (22) protruding outward along the outer circumferential surface so that the end of the cam member (50) contacts when the cam member (50) . The method according to claim 1,
Wherein the cam member (50) is formed symmetrically with respect to the motor shaft (45) of the drive motor (40) in left and right directions. The method according to claim 1,
The breaker main body 10 is provided with a receiving portion 16 which is provided so as to communicate with the inside of the cylinder 15 so as to protrude outward at one side so as to receive the cam member 50 and the driving motor 40 Spring and compressed gas breakers. The method according to claim 1,
And a cushioning material (72, 74) detachable from the end of the cam member (50) or the lower portion of the piston (20). The method according to claim 1,
Characterized in that the cam member (50) further comprises a reinforcing member (75) integrally coupled to an end portion of the piston member (20) that is in contact with the piston (20) and having a hardness higher than that of the piston .

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