WO2016099162A1

WO2016099162A1 - Hammering body for hydraulic hammering device

Info

Publication number: WO2016099162A1
Application number: PCT/KR2015/013838
Authority: WO
Inventors: 장명수
Original assignee: 주식회사수산중공업
Priority date: 2014-12-19
Filing date: 2015-12-17
Publication date: 2016-06-23
Also published as: KR20160074973A; KR101751409B1

Abstract

The present invention relates to a hammering body (1) for a hydraulic hammering device. A conventional hydraulic hammering device allows scratches to be frequently generated on sliding surfaces of a body (10) and a piston (11) and allows severe vibration to be generated due to a great pressure difference between the highest pressure and the lowest pressure during the operation thereof. The present invention avoids direct contact between the piston (11) and a cylinder (10) during a hammering reciprocation motion of the piston (11) by inserting and forming cylindrical sleeves (31, 32, 33, 34, 35) in the inner wall of the body, prevents scratches on the piston or the cylinder by implementing the sleeve, made from a material weaker than steel, between the cylinder (10) and the piston (11), remarkably reduces a difference in operating pressure so as to reduce vibration during impact reciprocation of the piston (11), by providing buffer communication holes (46, 47) and a check valve (51) between a lower hydraulic chamber (55) and an upper hydraulic chamber (56), and can lower manufacturing costs so as to remarkably improve performance thereof, by forming a removable lower seal retainer (20) at the lower part of the body (10).

Description

Strike Body for Hydraulic Strike

The present invention relates to a striking body for a hydraulic striker, and more particularly, by inserting a cylindrical sleeve into the inner wall of the body to avoid direct contact between the piston and the cylinder to increase the strength hitting the cylinder wall as the piston shakes. A seal retainer that can separate the sealing seal portion from the lower part of the cylinder as a hydraulic strike device that significantly reduces and adopts a material weaker than steel between the cylinder and the piston to prevent scratching of the piston or the cylinder and significantly lower the production cost. Hydraulic hammer which greatly simplifies machining inside the cylinder by inserting a cylinder and a check valve after connecting the cylinder lower hydraulic chamber and the upper hydraulic chamber to form a check valve. It relates to the striking device.

In general, the hydraulic hammer is a hydraulic breaker or a hydraulic rock drill used to crush or drill concrete or rock by mounting on a construction machine such as an excavator, a loader.

The hydraulic hitting device is a blow body is formed, the bottom of the chisel (chisel), a bit rotating mechanism (bit) is formed by the rotation (bit) by a rotating motor (hereinafter referred to as "shank") is fixed.

The hitting body of the hydraulic striker is formed with a piston therein, the piston strikes the end of the chisel while moving up and down by hydraulic pressure.

Figure 5 shows a hydraulic breaker of the conventional hydraulic striker, the lower body 13 is formed at the lower end of the striking body 1, the chisel 14 is fixed inside the lower body (13).

The striking body 1 is formed of a lower body 13 and the upper body 12, a piston 11 is formed inside the body 10, the upper body 12 on the upper portion of the body 10 ) Is formed.

The body 10 has a plurality of flow path grooves are formed on the inner wall, a plurality of flow path holes are formed in the wall communicating with the flow path groove, the

control valve

60 or 16 protruding from the outer wall of the body 10 is formed. .

The piston 11 of the striking body 1 is connected to the fluid flowing into the lower hydraulic chamber 55 through the lower communication hole 65 and the fluid flowing into the upper hydraulic chamber 56 through the upper communication hole 66. By the pressure difference between the upper and lower surfaces of the piston 11 generated by the vertical movement, the lower end of the piston 11 is formed to repeatedly hit the upper end of the chil (14).

[Preceding technical literature]

[Patent Documents]

(Patent Document 1) The related art of a hydraulic strike device has been disclosed in Korean Patent Office Publication Nos. 1996-0006735, 04567868, 0998261, 0772301, and 2011-0086289.

However, the hitting body of the conventional hydraulic striker had the following problems.

(1) Since the piston's outer circumferential surface and the cylinder's inner wall are in direct contact with each other while the piston is impacted and reciprocated, a lot of scratches are generated on the outer circumferential surface or the inner circumferential surface of the piston.

(2) While the piston is impacted and reciprocated, a lot of hydraulic oil leaks through the lower part of the cylinder due to the shaking and scratching of the piston.

(3) When the piston impacts the rod, the lower pressure chamber formed by the cylinder and the piston causes the pump to not supply the operating oil necessary for the rapid backward movement of the piston due to the repulsive force of the piston. High pressures occur, which causes severe pressure pulsations.

(4) Several inner circumferential surfaces with different diameters are formed on the inner surface of the cylinder, and in order to process them, they must be precisely processed to meet the same center.

(5) In order to minimize the tolerance of the gap between the outer circumference of the piston and the inner circumference of the cylinder, the large body must be precisely processed as a whole.

(6) When the piston is impacted inside the body, strong vibration of the piston occurs. At this time, the strong pressure on the inner wall of the cylinder is accompanied, so that the body must be made of special material and special heat treatment is required. It takes a long time to produce.

The present invention to solve the above problems

In the body is formed, the inner body of the piston is formed, the upper body of the upper body is formed in the blow body for a general hydraulic striking device,

(1) a thin sleeve is inserted and formed at different diameters of the inner circumferential surface of the body that slides with the piston,

The sleeve has a flow path hole is formed so as to communicate with the flow path in the inner wall of the cylinder and the inner peripheral surface of the sleeve at the position of the working oil flow path groove installed on the inner wall of the cylinder,

(2) a separate detachable seal retainer is inserted into the lower end of the body,

Sleeves are inserted into the seal retainer inner circumferential surface before and after sealing seals, respectively.

(3) A flow path communicating with the cylinder lower hydraulic chamber and the upper hydraulic chamber is formed, and on this channel, a spool in which hydraulic oil can flow from the upper hydraulic chamber to the lower hydraulic chamber and the hydraulic fluid cannot flow in the opposite direction ( Or check valve),

(4) The upper end is characterized in that the piston is formed by a seal retainer (Seal Retainer).

According to the striking body for the hydraulic hammer device of the present invention the following effects occur.

(1) Since the sleeve material is made of non-metal or non-ferrous material, scratches and oil leakage do not occur even when the piston is in contact with the inner circumferential surface of the sleeve during impact reciprocation.

(2) Since only the sleeve inserted into the body needs to be precisely processed, manufacturing cost and manufacturing time are reduced.

(3) Since the material of the sleeve is made of non-metal or non-ferrous material, no heat treatment is required, so manufacturing cost and manufacturing time are reduced.

(4) Since only the seal retainer inserted in the lower part of the body needs to be precisely processed, the manufacturing cost and manufacturing time are significantly reduced.

(5) Since the lower part of the body only needs to process a step for assembling a separate lower seal retainer, the number of elements to be matched concentrically is significantly reduced, so the processing of the body is simple, and the manufacturing cost and manufacturing time are reduced.

(6) The lower seal retainer inserted at the bottom forms a dust seal on the frontmost surface, followed by a sleeve, followed by a few leak-tight sealing seals on the back of the seal so that the piston is inclined relative to the sliding surface during impact. This will significantly reduce leakage by not affecting the seals in the seals.

(7) Body cylinder The upper hydraulic chamber and the lower hydraulic chamber communicate with each other, and when the shock valve is used, the high pressure oil of the upper hydraulic chamber is generated at the low pressure of the lower hydraulic chamber, so the pulsating pressure difference is significantly reduced when the striking body is operated. do.

Figure 1 is a side cross-sectional view showing a striking body for a hydraulic striker formed in a preferred embodiment of the present invention.

Figure 2 is a side cross-sectional view showing only a cylinder and a piston, the lower seal retainer portion showing the striking body for the hydraulic striker formed in a preferred embodiment of the present invention.

Figure 3 is an enlarged side cross-sectional view C portion showing the striking body for the hydraulic hammer formed in the preferred embodiment of the present invention.

Figure 4 is an enlarged side cross-sectional view portion D showing the striking body for the hydraulic hammer formed in the preferred embodiment of the present invention.

Figure 5 is a side cross-sectional view of the striking body for a hydraulic hammer formed in another embodiment of the present invention.

Figure 6 is an enlarged side cross-sectional view A portion of the striking body for the hydraulic hammer formed in another embodiment of the present invention.

Body 10 is formed, a piston 11 is formed inside the body 10, the upper body 12 is formed on the upper portion of the body 10 and the lower body 13 is formed on the lower portion In the general hydraulic stroke hitting body (1) in which the chisel 14 is formed inside the lower body (13),

Several sleeves

34 and 35 are inserted into the body 10,

At least one through hole is formed in the wall of the sleeve 34, and the through hole is connected to the through hole at the position of the cylinder conversion groove 42 in the cylinder 10.

At least one through hole is formed in the wall of the sleeve 35, and the through hole is connected to the through hole at a position of the cylinder low pressure groove 43 in the cylinder 10.

The lower seal retainer 20 is inserted into the lower portion,

The outer side of the lower seal retainer 20 is formed with a groove into which the sealing seal 24 can be inserted to form a sealing seal 24, and a thread 26 is formed to form a cylinder 10 and a thread 26. Assembled,

Inside the groove to which the dust seal 21 can be inserted is formed, the dust seal 21 is formed,

A cylindrical sleeve 31 and a sleeve 32 are formed, and grooves for inserting the

seal seals

22 and 23 are formed in the middle of the two sleeves, thereby forming

seal seals

22 and 23, and having different diameters. Sleeve 33 is formed on the inner circumferential surface,

The upper seal retainer 17 is formed at the top,

A piston 11 is formed inside the lower seal retainer 20, the

sleeves

34 and 35 at the middle of the body, and the upper seal retainer 17.

The control valve 60 is formed on the outside of the body 10 and through the cylinder low communication hole 66

In accordance with the operating principle of the piston 11 and the control valve 60, the piston 11 reciprocates up and down, and at the bottom dead center, the lower end of the piston 11 hits the hitting surface of the chisel 14,

The high lateral force due to the piston vibration during the striking contact with the

sleeves

31, 32, 33, 34, 35 avoids direct contact with the body 10.

Another preferred embodiment of the present invention linked as described above will be described as follows.

The lower hydraulic chamber 55 of the body 10 has a cylinder lower groove 41 and a buffer lower communication hole 46, a spool chamber 50, a buffer upper communication hole 47, and an upper cylinder groove 45. In communication with the upper hydraulic chamber 56,

A check valve 51 is formed between the buffer lower communication hole 46 and the buffer upper communication hole 47.

The hydraulic fluid can flow from the upper hydraulic chamber 56 to the lower hydraulic chamber 55 by the check valve 51, but the hydraulic oil cannot flow from the lower hydraulic chamber 55 to the upper hydraulic chamber 56.

When the piston 11 hits the chisel 14 while reciprocating, the lower hydraulic chamber 55 is significantly lowered in the chamber pressure due to the shortage of the operating oil due to the repulsive force immediately after the stroke, and the upper hydraulic chamber 56 has the instantaneous compression force. By the very high chamber pressure is formed, this pressure is much higher than the chamber pressure of the lower hydraulic chamber 55,

At this time, the hydraulic fluid is introduced into the lower hydraulic chamber 55 through the buffer upper communication hole 47, the check valve 51, and the buffer lower communication hole 46 by the check valve 51.

The lower hydraulic chamber 55 compensates for the insufficient hydraulic oil, and the upper hydraulic chamber 56 sends some overflowing hydraulic oil to the lower hydraulic chamber 55 to significantly reduce the difference between the upper chamber pressure and the lower chamber pressure.

Although the present invention has been described with reference to the accompanying drawings, it will be apparent to those skilled in the art that various modifications may be made without departing from the scope of the present invention, which is covered by the following claims.

[Description of the code]

1: hitting body 10: cylinder

11 piston 12 upper body

13: lower body 14: chisel

15 Accumulator 16: Control Valve

17: Upper seal retainer 20: Lower seal retainer

21 dust seal 22 sealing seal-1

23: sealing seal-2 24: sealing seal-3

26: thread 31: sleeve-1

32: sleeve-2 33: sleeve-3

34: sleeve-4 35: sleeve-5

41: cylinder lower groove 42: cylinder switching groove

43: cylinder low pressure groove 45: cylinder upper groove

46: buffer lower communication hole 47: buffer upper communication hole

50: Spool chamber 51: Spool (or check valve)

52: spring 53: blocking block

55 cylinder lower hydraulic chamber 56 cylinder upper hydraulic chamber

60: control valve 61: high pressure flow path

62: low pressure flow path 63: cylinder low rolling hole

64: cylinder valve switching communication hole 65: cylinder valve lower communication hole

66: cylinder valve upper communication hole

Claims

The body 10 is formed, the piston 11 is formed inside the body 10, the upper body 12 is formed on the upper portion of the body 10 and the lower body 13 is formed on the lower In the general hydraulic stroke hitting body (1),

Several sleeves 34 and 35 are inserted into the body 10,

The sleeve 34 and the sleeve 35 are each formed with at least one through hole in the wall,

The lower seal retainer 20 is inserted into the lower portion,

The outer side of the seal retainer 20 is formed with a groove into which the sealing seal can be inserted and a thread 26, and a groove into which the dust seal 21 can be inserted into the inner side thereof, and a sleeve 31 and a sleeve ( 32 is formed, and the sealing seals 22 and 23 are formed in the middle of the two sleeves, and the sleeve 33 is formed on the inner circumferential surface having different diameters.

Strike body for the hydraulic hammer device, characterized in that the upper seal retainer 17 is inserted in the upper portion.
The method of claim 1,

The material of the sleeve (31, 32, 33, 34, 35) is a blow body for a hydraulic striker, characterized in that using a non-metal or non-ferrous metal.
The body 10 is formed, the piston 11 is formed inside the body 10, the upper body 12 is formed on the upper portion of the body 10 and the lower body 13 is formed on the lower In the general hydraulic stroke hitting body (1),

A lower communication passage hole 46 is formed which communicates the lower hydraulic chamber 55 and the spool chamber 50 with each other.

An upper communication passage hole 47 communicating with the upper hydraulic chamber 56 and the spool chamber 50 is formed.

The spool chamber (50) has a shank valve (51) and a spring (52) is a blow body for a hydraulic strike device, characterized in that formed.