electric demolition hammer

electric demolition hammer

The Electric Demolition Hammer is a potent electric handheld construction equipment that uses constant impact force to break, carve, and disassemble heavy building materials.

Basic Concept and Main Application Scenarios of Electric Demolition Hammer

In the construction industry, an electric demolition hammer is also known as an electric concrete breaker or demolition pick. It differs significantly from regular electric drills and rotary hammer drills in that it concentrates solely on impact pounding rather than combining rotation and striking.

The drilling rotation feature is completely absent from this tool, which depends on household or industrial alternating current for long-lasting power. It covers a wide range of real-world usage scenarios in technical construction and everyday décor. Workers use it to remove outmoded brick partition walls that need to be replaced, break up redundant concrete ground layers, chisel away uneven cement plaster on walls, and knock off old wall tiles during interior home renovations.

It can split strong concrete foundations, break hardened asphalt surface, disassemble abandoned building components, and cut apart partially removed reinforced concrete buildings in large-scale construction and road maintenance projects. In addition to demolishing buildings, it can break moderately hard stone blocks on construction sites to fulfill basic material processing requirements. It is also used in pipeline laying work to chisel grooves on walls and floors for embedding water pipes and electric lines. While heavy-duty large models are ready for long-term, high-intensity engineering dismantling operations, compact, lightweight electric demolition hammers are ideal for do-it-yourself minor restoration projects.

Working Principle of Electric Demolition Hammer

The internal drive motor and pneumatic impact mechanism within the main machine body must cooperate for an electric demolition hammer to function. An eccentric crankshaft component linked to the motor output shaft will receive the rotational kinetic energy from the tool’s built-in high-speed motor after it is connected to the power supply and the power switch is turned on. A piston within the closed cylinder is forced to slide back and forth at a very high frequency by the reciprocating force created when the eccentric crankshaft converts circular rotation into back-and-forth linear reciprocating motion.

When a striking hammer block is positioned between the piston and the inserted chisel bit, the piston compresses the air inside the cylinder as it moves forward, propelling the hammer block to quickly and forcefully strike the chisel bit’s tail. After one stroke, the hammer block rebounds under air pressure, the piston goes backward to reset, and the entire sequence of events quickly repeats. The focused impact force is applied directly from the chisel head to the concrete, brick, or stone contact surface, rapidly causing microscopic fissures in the hard materials’ surface.

The goal of breaking and dismantling is achieved when thousands of repeated hits occur per minute, causing the fissures to widen until the entire material breaks and falls off.The majority of professional-grade electric demolition hammers use an oil-sealed pneumatic cylinder structure, which stores lubricating oil inside the cylinder to reduce friction between moving parts. This reduces mechanical wear, stabilizes impact power, and enables the machine to run continuously for several hours without noticeable power attenuation.

Core Performance Parameters and Power Classification of Electric Demolition Hammer

Three key factors are used to evaluate an electric demolition hammer’s overall performance: input power, impact energy, and impact frequency per minute. Based on these factors, the product is classified as either industrial heavy-duty or household light to meet varying work intensity requirements. The term “input power” describes the amount of electricity used by the motor when it is operating. Small domestic models typically have a power consumption of 700 to 1200 watts and are lightweight. The input power of industrial heavy-duty models ranges from 1500 to 3600 watts; this higher power can sustain the motor’s stable functioning under long-term overload circumstances and prevent abrupt power drops during heavy demolition activity.

The strength of each chisel bit stroke is represented by impact energy, which is expressed in joules. Professional heavy equipment can effectively break thick concrete and solid brick walls with an impact energy of 40 to 85 joules per blow, while light domestic demolition hammers can handle tile removal and shallow wall grooving with an impact energy of 10 to 25 joules. The number of times the machine strikes in a minute is known as the impact frequency. The impact frequency of common items ranges from 1300 to 2000 times per minute.

For thin and brittle materials, a higher frequency results in a faster fragmentation speed; for particularly thick and rigid concrete structures, a moderate frequency with a bigger single impact energy works better. All officially certified electric demolition hammers use Class II insulation, a double insulation safety design that eliminates the need for grounding wires and successfully reduces the risk of electric leakage in damp construction environments including basements and outdoor sites.

Main Body Structure and Humanized Functional Design of Electric Demolition Hammer

The main motor body, main rear handle, rotatable auxiliary side handle, switch control area, cylinder impact head, and tool bit locking structure make up the entire machine of an electric demolition hammer. Several useful protective and labor-saving designs are added to each component to enhance operation comfort and safety. There is a continuous lock button on the handle’s power switch. The machine can run continuously without the user having to constantly squeeze the switch with their fingers when they press the trigger switch and toggle the lock buckle, which significantly reduces finger fatigue during extended working hours.

The built-in vibration reduction spring inside the auxiliary side handle buffers most vibration transmitted from the machine to arms, lowering the likelihood of arm soreness and vibration damage after extended use. Additionally, the auxiliary side handle can rotate 360 degrees around the front cylinder part of the machine, allowing operators to freely adjust the grip angle regardless of working on horizontal ground. The motor main body’s cover has a number of strip-shaped heat dissipation vents. When the motor produces a lot of heat during high-load operation, hot air is released from the exhaust holes and cold air enters from the air inlet to quickly remove internal heat and keep the motor coil from overheating and burning out.

An automatic overheat protection chip is integrated into the circuit system of the majority of medium- and high-end models. The power supply will immediately cut off to protect the core motor components when the internal temperature rises over the safe threshold due to continuous overload work. The tool can only be restarted once the temperature has returned to normal. Additionally, an anti-stall safety clutch is mounted where the impact cylinder and tool bit are connected. In order to prevent the machine from forcefully bouncing back and injuring the operator’s hands or body, the clutch will immediately disengage the transmission force if the chisel bit is securely embedded in hard stone or reinforced concrete and cannot move.

Daily Operation Specifications and Maintenance Methods

An electric demolition hammer’s service life can be increased and the chance of personal safety mishaps while usage reduced with standard operating procedures and routine maintenance. Before beginning work, operators should make sure the plug is secure and not loose, look for fractures, breaks, or exposed inner wires in the power cable, and make sure the installed tool bit is fully locked and cannot move back and forth.

Before beginning work, protective gloves, safety goggles, and dust masks must be worn. Broken concrete particles will splash around when striking, easily injuring skin and eyes, and a lot of construction dust will be inhaled, harming the respiratory system.Before turning on the power switch to start the machine, press the chisel bit’s tip up against the working surface.

The internal impact hammer block and cylinder components will sustain significant damage if the machine is started in an idle state with the bit hung in the air. The machine itself has adequate impact force to finish breaking work, so avoid applying excessive downward pressure with both hands while operating. This will increase the motor’s load and hasten component degradation.To avoid dust blockage influencing the heat dissipation effect, use a brush to remove the dust that has gathered in the machine shell’s heat dissipation holes.

To keep internal piston and hammer parts from rusting due to damp air, periodically pour a small amount of special pneumatic lubricating oil into the cylinder chuck position of long-term stored equipment. To prevent extrusion and breakage, the power cable should be carefully coiled and the machine should be positioned in a dry, well-ventilated area rather than a damp outdoor space. Instead of removing the internal structure in private to prevent destroying precise parts or creating electric safety problems, stop using the machine right away if it makes strange noises and send it to professional maintenance workers for inspection.