Búa phá đá Caterpillar lắp trên máy đào - P2

Nội dung: - Giới thiệu sản phẩm - Đầu búa H45-H100 - Đầu búa H115-H180 - Kiểm tra và điều chỉnh - Bảo dưỡng - Kiểm tra - Serie sản phẩm

Caterpillar Hammers

World Hammer Mar ket

Utilizes Two Different

Power Concepts

OR

Self Contained System

Piston - Gas System Accumulator Design

Direct Acting

Caterpillar Impact Products Lid.

Front Head

Transfers forces from tool

Align tool with the piston

Provide contact surfaces with tool

Field replaceable for better serviceability

Caterpillar Hammers

Tool Retainer Pin f

'

Prevents tool from falling out

Absorbs partial impact

loads of idle strokes

Transfers impact loads to

front head on idle strokes

Caterpillar Impact Products Lid.

Caterpillar Hammers

Thrust Ring

Positions tool for correct

contact with piston

Absorbs shock loads from tool

Caterpillar Impact Products Lid.

Tie Rod Assembly

Holds assembly together

Absorbs partial impact loads L| |

from idle strokes |

Transfers hydraulic power

into a shock wave transmitted thru the tool |

Caterpillar Impact Products Lid.

Supplies oil to the low ¬ |

preSSure circuit on start-up “Tí

Assures a constant force

in the Low pressure circuit

Functions like a pressure

Accumulator Nitrogen (N2) pre charge

Positions membrane for proper operation

Low pressure - pre charge Controls energy output and working oil volume

Caterpillar Hammers

Reliabilit y Factors Lower and upper seals are identical

“A small amount of oil leakage between tool and tool bushing

Accumulator Design F————— J Direct Acting Design |

@ Leakage points *Ref: NPK Service Manual 98.2.500 Page 16

Caterpillar Hammers

Productivity: Consistent Productivity: Variable

Caterpillar Hammers

H45 - H100 OPERATING PRI NCI PLE

Constant Blow Energy (CBE)

Low Pressure Accumulator

Caterpillar Hammers

ACCUMULATOR , OPERATING PRINCI PLE

FROM AND PISTON

DISTRIBUTOR DISTRBUTOR H45 - H100

VALVE

LOW PRESSURE ACCUMULATOR CF HIGH PRESSURE

| The hammer cycle begins with high and low pressure

ay circuits common to each other and separate from return

_." The hammer is under low pressure, with the piston and

distributor in their lowest position

PISTON

Oil flows into the low pressure accumulator circuit, acting

on the end of the pressure reducing valve spool An increase in pressure moves the spool to a pre adjusted setting, closing the path between high and low pressure circuits The low pressure circuit is now pre charged

Pressure increases in the high pressure circuit and the

hammer cycle begins

Caterpillar Impact Products Lid.

Caterpillar Hammers

ACCUMULATOR OPERATING PRI NCI PLE

FROM AND PISTON TO

Caterpillar Impact Products Lid.

Caterpillar Hammers

“ACCUMULATOR OPERATING PRI NCI PLE

LOW PRESSURE FROM PHUN TO

DISTRIBUTO @wA land opens the high pressure circuit to the top shoulder

VALVE | area of the distributor by way of the pilot channel

PIST Due to an area differential, the force acting on the top

shoulder of the distributor is greater than that on the lower shoulder, forcing the distributor to its lowest

The piston is accelerated downward by the force in the

low pressure circuit acting on the upper shoulder of the piston

Caterpillar Impact Products Lid.

Caterpillar Hammers

ACCUMULATOR OPERATING PRI NCI PLE

FROM AND PISTON TO

eh As the piston impacts the tool, the pressure

PISTON acting on top shoulder of the distributor changes PILOT from high to low pressure The distributor

PASSAGE

returns to its upward position, opening the top of

the piston to return The next lifting cycle begins

Note: The high pressure accumulator dampens the pressure pulsation occurring when the piston impacts the tool Each blow provides consistent impact force, as the regulated low pressure

circuit accelerates the piston

Caterpillar Impact Products Lid.

Initial start- crom “ANDPRION To OPERATING PRI NCI PLE

nitial Start-up DISTRIBUTOR DISTRIBUTOR

Inlet oil primes the low VALVE VANE H45 - H100

pressure circuit and closes rE | |

the path between inlet and tan

low pressure circuit at i Ï CBE Design

100 psi (68 kPa) CS MIACHNE

TO LOW PRESSURE

2 TẤN HƯỂN” re

Al, Ễ DISTRIBUTOR DISTRIBUTOR

Normal operation VALVE VALVE

Low pressure circuit is isolated

from both inlet and tank lines r1 |

PRESSURE

during operation cycle REDUCING

¬ VALVE FROM MACHINE AUX CIRCUIT

3 LOW PRESSURE

Constant Blow Energy From to Tank To

(CBE) Distribu tor eee

Low pressure circuit maintains constant force by opening low pressure circuit to return line if force exceeds spring rate Pressure

Reducin

Tank L | Valve

AUX.CIRCUIT FROM MACHINE

Caterpillar Impact Products Lid.

2 Check seal sits properly in recess area

3 Check for gas leaks, appearance of bubbles indicates bad seal

4 Inspect bond between seal and steel ring

Caterpillar Hammers

Pressure Adjusting Valve (PAV)

«Spring Pre-Load (shimmed)

«See Service Manuals for Settings

Caterpillar Hammers

s„ —Locking Plates

1 - Keep Tie Rod and Nut as matched pair

2 - Don't install Tie Rod Nut upside down

3 - Washer chamfer should face tie rod head

4 - Follow torque sequence in Service Manuals

thread area and under bolt head,

every time hammer Is disassembled | Check Here [~~ °

lf a tie rod is cracked, replace that rod and nut as well as the rod and nut on opposite corner

Caterpillar Impact Products Lid.

Assembly Slide Ring

Steering Ring

Caterpillar Impact Products Lid.

2 Use a 12mm threaded rod, inserted

into threaded plate to pull out the

distributor, assembly ring, and

adjoining parts

Installation

1 Use the 12mm threaded rod to assist with installing the distributor assembly

2 Check the distributor movement

Distributor must move freely

Caterpillar Impact Products Lid.

Caterpillar Hammers

Wear Limit - Lower Tool Bushing

Measure Depth of Worn Area- Dimension “A”

see Service Manuals for specifications ny

Replace Bushing if ID out of spec /

Replace if than specifications allow

See service manuals for specifications

9 bạ H45 Example:

New bushing diameter 45mm

Replace if diameter is more than 47mm

Caterpillar Impact Products Lid.

Caterpillar Hammers

Wear Limit -Tools

Measure Diameter of Tool at Upper and Lower Bushing Areas Replace if not to specification

See service manual for specifications

H45 Example:

New tool diameter 45mm Replace tool if less than 43mm

Upper Tool Bushing Area

Lower Tool Bushing Area

Caterpillar Impact Products Lid.