Hammering Tool Motor Control for Drilling Efficiency
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Solution Overview
Problem
Hammer drills face inefficiencies in high-speed hole drilling due to limitations in the number of hammering times, as increased driving energy or motor rotations lead to size and weight increases, and the hammering member's inability to follow piston reciprocation, resulting in weakened driving force and reduced drilling speed.
Innovation Solution
A hammering tool with a measuring device to monitor drive current and a control device that adjusts motor rotations to maintain the number of hammering times near the limit, preventing the hammering member from exceeding the maximum efficient rotations, thereby enhancing efficiency and reducing tool size and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the driving energy of the tool per driving is increased by increasing the mass of the hammering member, then the hole drilling speed is improved, but the size of the main body of the tool is increased
Solution Approach 1:
The invention changes the operational parameters of the hammer drill by controlling the motor rotation speed to maintain the number of hammering times below the limit number. This parameter control allows the system to operate efficiently without requiring increased mass or size of components, thereby resolving the contradiction between drilling speed and tool size.
2Productivity
If the number of rotations of the motor is increased to increase the number of times of hammering, then the hole drilling speed is improved, but the hammering member becomes unable to follow the piston and the driving force is weakened
Solution Approach 1:
The invention implements a control mechanism that monitors the operating conditions and adjusts the motor rotation speed to maintain the number of hammering times below the limit number. This feedback control ensures that the hammering member can consistently follow the piston reciprocation, maintaining reliable driving force while optimizing drilling speed.
Solution Approach 2:
The system dynamically adjusts the motor rotation speed based on operational conditions to maintain optimal hammering frequency. This dynamic control allows the hammering member to follow the piston reciprocation effectively across varying operating conditions, preserving driving force reliability while maximizing productivity.
3Reliability
If the number of rotations of the motor is set low to prevent the number of times of hammering from reaching the limit, then the hammering member can follow the piston, but the hole drilling speed is lowered
Solution Approach 1:
The invention operates the motor at a rotation speed that produces a number of hammering times that is intentionally kept below the limit number. This partial action approach ensures reliable hammering member following while maintaining sufficiently high drilling speed for practical applications, resolving the contradiction between reliability and productivity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The tool achieves high-performance hammering operations by maintaining the number of hammering times near the limit, increasing efficiency and maintaining excellent driving performance while reducing the tool's size and weight.
Implementation Method 1
a piston is driven by a motor to reciprocate back and forth on the axis of a top end tool to thereby vary the air pressure of an air chamber formed between the piston and a hammering member; and thus, variations in the air pressure (air spring) are used to allow the hammering member to generate its driving motion
Implementation Method 2
variations in the air pressure (air spring) are used to allow the hammering member to generate its driving motion
Data Source
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AI summary
A hammering tool includes, within its tool main body 1, a piston 2 which reciprocates by using a motor 7 as its drive force, a hammering member 3 which carries out its hammering operation in linking with the reciprocating motion of the piston 2, and an intermediate member 4 which transmits a hammering force of the hammering member 3 to a top end tool 5 mounted on the top end of the tool main body 1. The tool main body 1 further includes a measuring device 13 which measures a hammering state of the hammering member 3 and a control device 14 which controls the number of rotations of the motor 7. The control device 14, according to measurement results of the measuring device 13, determines the limit number of times of hammering where the hammering member 3 becomes unable to follow the reciprocating motion of the piston 2, and thus controls the number of rotations of the motor 7.