CN117749028B - Control method and system for adjusting output power of reciprocating saw according to material hardness - Google Patents
Control method and system for adjusting output power of reciprocating saw according to material hardness Download PDFInfo
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- CN117749028B CN117749028B CN202311776295.7A CN202311776295A CN117749028B CN 117749028 B CN117749028 B CN 117749028B CN 202311776295 A CN202311776295 A CN 202311776295A CN 117749028 B CN117749028 B CN 117749028B
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- 239000000463 material Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000005520 cutting process Methods 0.000 claims description 15
- 238000001514 detection method Methods 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 9
- 230000003044 adaptive effect Effects 0.000 claims description 6
- 239000002699 waste material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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Abstract
本发明涉及一种根据材料硬度调整往复锯输出功率的控制方法及系统，通过检测被切割材料硬度选择合适的电机工作电压，以此调节电机的输出功率，避免往复锯使用高功率切割低硬度材料而浪费电能，从而提高往复锯的能源利用率，对使用电池包供电的往复锯而言，可有效延长电池包的续航时间。
The present invention relates to a control method and system for adjusting the output power of a reciprocating saw according to the hardness of a material. The method detects the hardness of the material being cut and selects a suitable motor operating voltage to adjust the output power of the motor, thereby avoiding the reciprocating saw from wasting electric energy by using high power to cut low hardness materials, thereby improving the energy utilization rate of the reciprocating saw. For a reciprocating saw powered by a battery pack, the battery life of the battery pack can be effectively extended.
Description
Technical Field
The invention relates to a cutting tool, in particular to a control method and a system for adjusting output power of a reciprocating saw according to material hardness
Background
The reciprocating saw mainly takes the handheld operation of a common user as the main part, is mainly applied to garden cutting or simple metal cutting, is relatively simple to operate, and controls the rotating speed of a motor of the reciprocating saw only by pressing the switch through the stroke of the switch, thereby controlling the cutting speed.
In the actual cutting process, the reciprocating saw can relate to different kinds of materials, the hardness of the materials is different, a user can usually press the switch to the maximum stroke and cut at the maximum rotating speed, however, for the materials with different hardness, the same rotating speed is adopted for cutting, the conditions of insufficient power or excessive power exist, and the energy utilization rate is low.
Disclosure of Invention
The invention aims to solve the technical problems of energy waste and low energy utilization rate when a reciprocating saw cuts materials with different hardness.
In order to solve the technical problems, the invention adopts the technical scheme that the control method for adjusting the output power of the reciprocating saw according to the hardness of materials comprises the following specific steps:
S1, driving a motor to rotate according to rated output voltage and PWM frequency to enable a reciprocating saw to work, cutting various materials with known hardness, detecting working current of the motor and obtaining current amplitude width;
S2, fitting a function relation I=f (H) of the hardness H and the current amplitude width I according to a large amount of hardness and current amplitude width data;
s3, driving the reciprocating saw to work under the rated output voltage and PWM frequency, cutting the material to be cut, detecting the amplitude width of working current of a reciprocating saw motor, and solving the hardness of the material to be cut according to the functional relation obtained in the step S2;
S4, driving the reciprocating saw to cut materials with different hardness at the maximum output power, and measuring the maximum hardness Hmax of the materials which can be cut by the reciprocating saw under the power;
s5, selecting a material with the hardness Hmid to saw at the highest rotating speed, simultaneously gradually reducing the motor voltage until the reciprocating saw stops sawing, gradually increasing the motor voltage until the reciprocating saw can saw the material normally, and recording the adaptive voltage Vmid, wherein the hardness Hmid is smaller than Hmax;
s6, calculating a slope relation V=f (H) of the hardness and the voltage according to a motor voltage value corresponding to the material with the maximum hardness Hmax and a motor voltage value corresponding to the hardness Hmid;
S7, sawing the material with unknown hardness, detecting the amplitude width of the working current of the motor, and obtaining the hardness of the material according to the functional relation in the step S2;
and S8, the controller obtains an adaptive voltage value according to the material hardness obtained in the step S7 and the formula V=f (H) in the step S6, and the controller of the reciprocating saw enables the output power of the motor to be matched with the material hardness by adjusting the working voltage of the motor.
The invention further aims to solve the technical problems of energy waste and low energy utilization rate caused by the fact that the reciprocating saw has the energy waste phenomenon when cutting materials with different hardness.
The technical scheme includes that the control system for adjusting output power of the reciprocating saw according to material hardness comprises a power supply, a driving circuit and a motor which are connected in series, a control end of the driving circuit is electrically connected with a controller and controlled by PWM signals of the controller, a current detection circuit is connected between a negative electrode of the motor and the controller, the controller detects working current of the motor through the current detection circuit, and the power supply supplies power to the controller at the same time.
As a preferable scheme, the current detection circuit comprises a sampling resistor connected in series with the cathode of the motor, the other end of the sampling resistor is grounded, and two ends of the sampling resistor are respectively and electrically connected with the controller.
The invention has the beneficial effects that the output power of the motor is adjusted by detecting the hardness of the cut material and selecting the proper motor working voltage, so that the waste of electric energy caused by cutting the low-hardness material with high power by the reciprocating saw is avoided, the energy utilization rate of the reciprocating saw is improved, and the endurance time of the battery pack can be effectively prolonged for the reciprocating saw powered by the battery pack.
Drawings
The invention is described in further detail below with reference to the attached drawing figures, wherein:
FIG. 1 is a schematic diagram of the operation of the control system of the present invention;
FIG. 2 is a schematic diagram of the circuit connection of the transformer to the on-load tap changer according to the present invention;
fig. 3 is a circuit diagram of a specific current detection circuit according to the present invention.
Detailed Description
Specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.
The control system for adjusting the output power of the reciprocating saw according to the material hardness as shown in fig. 1 and 2 comprises a power supply, a driving circuit and a motor which are connected in series, wherein the control end of the driving circuit is electrically connected with a controller, the PWM signal is controlled by the controller, a current detection circuit is connected between the cathode of the motor and the controller, the controller detects the working current of the motor through the current detection circuit, the power supply supplies power to the controller at the same time, a transformer is connected in series between the power supply and the driving circuit, an on-load tap changer is connected to an output coil L2 of the transformer, the controller is connected with the on-load tap changer, and the number of turns of the output coil of an access circuit is changed by controlling the on-off of each triode of the on-load tap changer, so that the output voltage of the transformer is adjusted.
In this embodiment, the on-load tap-changer is provided with six triodes, Q1 to Q6 respectively, the number of turns of the output coil L2 connected to each triode is different, and the controller can switch on one of the triodes to switch on the output coil L2 with a certain number of turns into the circuit and output a specific voltage. Switching different transistors can switch the output voltage of the transformer.
In practical application, the controller will switch the triodes sequentially in order of the gradient of the number of turns of the coil, so that the voltage is gradually changed to the target value.
As shown in fig. 3, the current detection circuit in this embodiment includes a sampling resistor R1 connected in series to the negative electrode of the motor, the other end of the sampling resistor R1 is grounded, and two ends of the sampling resistor R1 are respectively electrically connected with the controller.
The control method for adjusting the output power of the reciprocating saw according to the hardness of the materials based on the control system comprises the following specific steps:
S1, driving a motor to rotate according to rated output voltage and PWM frequency to enable a reciprocating saw to work, cutting various materials with known hardness, detecting working current of the motor and obtaining current amplitude width;
S2, fitting a function relation I=f (H) of the hardness H and the current amplitude width I according to a large amount of hardness and current amplitude width data;
s3, driving the reciprocating saw to work under the rated output voltage and PWM frequency, cutting the material to be cut, detecting the amplitude width of working current of a reciprocating saw motor, and solving the hardness of the material to be cut according to the functional relation obtained in the step S2;
S4, driving the reciprocating saw to cut materials with different hardness at the maximum output power, and measuring the maximum hardness Hmax of the materials which can be cut by the reciprocating saw under the power;
s5, selecting a material with the hardness Hmid to saw at the highest rotating speed, simultaneously gradually reducing the motor voltage until the reciprocating saw stops sawing, gradually increasing the motor voltage until the reciprocating saw can saw the material normally, and recording the adaptive voltage Vmid, wherein the hardness Hmid is smaller than Hmax;
s6, calculating a slope relation V=f (H) of the hardness and the voltage according to a motor voltage value corresponding to the material with the maximum hardness Hmax and a motor voltage value corresponding to the hardness Hmid;
S7, sawing the material with unknown hardness, detecting the amplitude width of the working current of the motor, and obtaining the hardness of the material according to the functional relation in the step S2;
And S8, the controller obtains an adaptive voltage value according to the material hardness obtained in the step S7 and the formula V=f (H) in the step S6, and the controller of the reciprocating saw enables the output power of the motor to be matched with the material hardness by adjusting the working voltage of the motor. In practical application, the adjustable motor operating voltage divides into multiple gear, then adjusts the operating voltage of motor to the gear voltage slightly bigger with the adaptation voltage value, for example the adaptation voltage value of finding is 15.4V, and adjustable operating voltage has 12V, 14V, 16V, 18V.
By the control system and the control method, the reciprocating saw can automatically adjust the output power by adjusting the voltage according to the hardness of the material to be cut, so that the energy waste caused by cutting the material with low hardness with high power is avoided, and the energy utilization rate is improved.
The foregoing embodiments are merely illustrative of the principles of the invention and its effectiveness, and some of its applications, and are not intended to limit the invention, it should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept, which would fall within the scope of the invention.
Claims (3)
1. The control method for adjusting the output power of the reciprocating saw according to the hardness of the material is characterized by comprising the following specific steps:
S1, driving a motor to rotate according to rated output voltage and PWM frequency to enable a reciprocating saw to work, cutting various materials with known hardness, detecting working current of the motor and obtaining current amplitude width;
S2, fitting a function relation I=f (H) of the hardness H and the current amplitude width I according to a large amount of hardness and current amplitude width data;
s3, driving the reciprocating saw to work under the rated output voltage and PWM frequency, cutting the material to be cut, detecting the amplitude width of working current of a reciprocating saw motor, and solving the hardness of the material to be cut according to the functional relation obtained in the step S2;
S4, driving the reciprocating saw to cut materials with different hardness at the maximum output power, and measuring the maximum hardness Hmax of the materials which can be cut by the reciprocating saw under the power;
s5, selecting a material with the hardness Hmid to saw at the highest rotating speed, simultaneously gradually reducing the motor voltage until the reciprocating saw stops sawing, gradually increasing the motor voltage until the reciprocating saw can saw the material normally, and recording the adaptive voltage Vmid, wherein the hardness Hmid is smaller than Hmax;
s6, calculating a slope relation V=f (H) of the hardness and the voltage according to a motor voltage value corresponding to the material with the maximum hardness Hmax and a motor voltage value corresponding to the hardness Hmid;
S7, sawing the material with unknown hardness, detecting the amplitude width of the working current of the motor, and obtaining the hardness of the material according to the functional relation in the step S2;
and S8, the controller obtains an adaptive voltage value according to the material hardness obtained in the step S7 and the formula V=f (H) in the step S6, and the controller of the reciprocating saw enables the output power of the motor to be matched with the material hardness by adjusting the working voltage of the motor.
2. The control system for adjusting the output power of the reciprocating saw according to the hardness of materials is used for implementing the control method of the claim 1, and is characterized by comprising a power supply, a driving circuit and a motor which are connected in series, wherein the control end of the driving circuit is electrically connected with a controller and controlled by PWM signals of the controller, a current detection circuit is connected between the cathode of the motor and the controller, the controller detects the working current of the motor through the current detection circuit, and the power supply supplies power to the controller at the same time.
3. The control system for adjusting the output power of the reciprocating saw according to the hardness of the material as claimed in claim 2, wherein the current detecting circuit comprises a sampling resistor connected in series with the cathode of the motor, the other end of the sampling resistor is grounded, and both ends of the sampling resistor are respectively electrically connected with the controller.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311776295.7A CN117749028B (en) | 2023-12-22 | 2023-12-22 | Control method and system for adjusting output power of reciprocating saw according to material hardness |
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| CN202311776295.7A CN117749028B (en) | 2023-12-22 | 2023-12-22 | Control method and system for adjusting output power of reciprocating saw according to material hardness |
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| CN117749028A CN117749028A (en) | 2024-03-22 |
| CN117749028B true CN117749028B (en) | 2025-03-18 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710317A (en) * | 2018-04-02 | 2018-10-26 | 上海广为焊接设备有限公司 | Cutting machine output control system and method |
| CN112643796A (en) * | 2020-12-21 | 2021-04-13 | 应伟民 | Reciprocating saw converter with cutter lifting function |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4267914A (en) * | 1979-04-26 | 1981-05-19 | Black & Decker Inc. | Anti-kickback power tool control |
| DE102022203184A1 (en) * | 2022-03-31 | 2023-10-05 | Robert Bosch Gesellschaft mit beschränkter Haftung | Functional interface for machine tools |
| JP2023163391A (en) * | 2022-04-28 | 2023-11-10 | 株式会社やまびこ | Electric working machine |
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2023
- 2023-12-22 CN CN202311776295.7A patent/CN117749028B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108710317A (en) * | 2018-04-02 | 2018-10-26 | 上海广为焊接设备有限公司 | Cutting machine output control system and method |
| CN112643796A (en) * | 2020-12-21 | 2021-04-13 | 应伟民 | Reciprocating saw converter with cutter lifting function |
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| CN117749028A (en) | 2024-03-22 |
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