KR101595245B1 - Spring and cam-driven type breaker - Google Patents

Abstract

The present invention relates to a spring and cam-driving type-breaker having an improved structure to provide a reciprocal elevation force to a piston using a spring and a cam, not a hydraulic pressure, thereby preventing leakage of oil, and allowing simplification of the structure to increase productivity and reduce manufacturing costs. The spring and cam-driving type-breaker comprises: a breaker main body; a spring member; a motor; and a cam member. The breaker main body has the piston arranged on an interior of the cylinder to perform an elevation operation and a chisel arranged on a lower side of the piston. The spring member has an upper end supported by the breaker main body and a lower end wound on the upper part of the piston to apply a downward elastic force. The 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 motor, is interlocked with the drive shaft of the motor to perform a rotation operation, and lifts up the lower part of the piston while performing the rotation.

Description

[0001] SPRING AND CAM-DRIVEN TYPE BREAKER [0002]

The present invention relates to a spring and a cam-driven breaker, and more particularly, it provides a piston with reciprocating strength by the elastic force of a spring and a driving force of a cam rather than a hydraulic pressure, thereby preventing oil leakage of a conventional hydraulic breaker, And more particularly to a spring-loaded and cam-driven breaker whose structure is improved so that productivity and manufacturing cost can be reduced.

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-described problems, and its object is to provide a piston reciprocating lifting force by using an elastic force of a spring and a driving force of a cam, And to provide a spring-loaded and cam-driven breaker whose structure is improved so as to increase the productivity and reduce the manufacturing cost by simplifying the structure.

Another object of the present invention is to provide a spring and cam-driven breaker that can simplify a structure by omitting a gas chamber filled with a conventional compressed gas, can improve manufacturing productivity and can reduce manufacturing cost, I have to.

According to an aspect of the present invention, there is provided a hermetic compressor comprising: a breaker body having a piston disposed in a cylinder and capable of moving up and down, and a chisel disposed on a lower side of the piston; an upper end supported by the breaker body, A driving motor which is disposed inside the cylinder and is driven by an external power source; and a driving motor connected to the motor shaft of the driving motor, And a cam member for lifting up the lower portion of the piston during operation.

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

The cam member is formed symmetrically to the left and right with respect to the motor shaft of the drive motor.

The breaker main body has a receiving portion communicating with the inside of the cylinder and formed to protrude outward at one side of the cylinder so that the cam member and the driving motor are received.

In the non-contact section, the piston is lowered by the restoring elastic force of the spring member in a state where the interference with the piston is excluded, and the chisel is hit by the piston. And a simple structure in which a lowering force and a lift force can be obtained by the restoring elastic force of the spring member and the rotation force of the cam member without applying the hydraulic pressure, so that the manufacturing productivity is improved and the oil leakage phenomenon can be prevented.

Further, the present invention has an advantage that manufacturing productivity can be improved and manufacturing cost can be reduced by simplifying the structure by omitting the gas chamber applied to the conventional air pressure type breaker.

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.
7 is a configuration diagram showing another modification of the cam member of the present invention.

2 to 6, a piston 20 capable of ascending and descending operation is disposed inside a cylinder 15, and a piston 20 is provided on a lower side of the piston 20 A spring member 30 supported by the breaker main body 10 and having a lower end wound on the upper portion of the piston 20 to apply an elastic force to the piston 20 in a downward direction, A driving motor 40 disposed in the cylinder 15 and driven by an external power source; a driving motor 40 connected to the motor shaft of the driving motor 40, And a cam member 50 for lifting up the lower portion of the piston 20 during the rotation operation.

2, the breaker main body 10 includes a cylinder 15 in which a piston 20 is housed, a back head (not shown) provided on the upper side of the cylinder 15 and provided with a space therein And a front head 17 in which a chisel 60 is disposed on the lower side of the cylinder 15. [

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.

The spring member 30 adopts a compression spring and has an upper end supported by the inner surface of the back head 11 and the other end supported by the piston 20 to give an elastic force pushing downward with respect to the piston 20 do.

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.

That is, as shown in FIG. 7, the cam members 50 of the present invention are arranged such that the three blades are respectively disposed at an angle of 120 DEG, so that the lifting and lowering cycles of the pistons 20 are shortened compared with the two blades previously described, .

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 A cushioning material for shock mitigation may be provided at the end or both sides of the cam member 50. [

That is, since the upper end of the spring member 30 of the present invention is in contact with the inner surface of the back head and the lower end of the spring member 30 is wound around the upper portion of the piston 20 and hooked on the latching jaw portion 22, As shown in Fig.

Since the end of the cam member 50 which is in contact with the lower side of the engaging jaw 22 of the piston 20 may be damaged by repetitive impact, the lower surface of the engaging jaw 22, Shock absorbing materials 72 and 74 may be provided at the end portions or both side portions of the support 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 exceeds the elastic force of the spring member 30 during the lifting operation of the piston 20, so that the spring member 30 contracts and the piston 20 ascends.

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 contracted spring member 30 The restoring elastic force generated while restoring to its original shape is transmitted to the piston 20, so that the lower end moves downward, and the lower end portion hits the upper end of the chisel 60.

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 The restoring elastic force of the spring member 30 and the rotational force of the cam member 50 can be applied to the lower and upper ends of the piston 20 without applying the hydraulic pressure, So that the manufacturing efficiency is improved and the oil leakage phenomenon can be prevented.

The present invention has the technical idea of reciprocating the piston 20 by using the spring member 30 and the cam member 50 and can be modified in any way without departing from the concept and scope of the present invention. It will be possible. For example, the present invention does not limit the joint structure and the material of the spring member 30 that applies the elastic force to the piston 20, and does not limit the shape of the cam member 50 or the number of the blades.

In addition, since the gas chamber of the conventional pneumatic type breaker is omitted, the present invention may be configured to omit the back head and to support the upper portion of the spring member 40 in the cylinder 15.

10: breaker main body 11: back head
15: cylinder 16:
17: Front head 20: Piston
22: latching jaw 30: spring member
40: drive motor 45: motor shaft
50: cam member 60: chisel
72, 74: cushioning material 75: reinforcing material

Claims (6)

A breaker body 10 in which a piston 20 capable of ascending and descending operations is disposed inside the cylinder 15 and a chisel 60 is disposed below the piston 20,
A spring member 30 whose upper end is supported by the breaker main body 10 and whose lower end is wound on the upper portion of 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,
A cam member 50 connected to the motor shaft 45 of the driving motor 40 and rotated by being driven by the driving motor 40 to lift and lower the lower portion of the piston 20 during the rotation operation Wherein the spring and the cam-driven breaker are made of metal. The method according to claim 1,
Wherein the piston (20) is formed with a latching jaw (22) protruded outward along the outer circumferential surface so that the end of the cam member (50) contacts when the cam member (50) Breaker. The method according to claim 1,
Wherein the cam member (50) is formed symmetrically to the left and right with respect to the motor shaft (45) of the drive motor (40). The method according to claim 1,
The breaker main body 10 has a receiving portion 16 formed so as to protrude outward at one side of the cylinder 15 so that the inside of the breaker main body 10 communicates with the inside of the cylinder 15 and the cam member 50 and the driving motor 40 are received Wherein the spring and the cam-driven breaker are provided with a spring. The method according to claim 1,
And a cushioning member (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,
Wherein the cam member (50) further comprises a reinforcing member (75) integrally coupled to an end of the cam member (50) that is in contact with the piston (20) and having a hardness higher than that of the material of the piston Breaker.

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