Lightweight lithium battery brushless multipurpose saw

Abstract

The invention relates to a lightweight lithium battery brushless multi-purpose saw which comprises a machine shell, the machine shell of the multi-purpose saw is made of magnesium alloy, a thin-wall part and a thick-wall part of the machine shell are manufactured and machined through a hot chamber die-casting method and a cold chamber die-casting method respectively, and the technological parameters of the magnesium alloy machine shell are controlled as follows: the preheating temperature of a magnesium alloy ingot is 130-190 DEG C, and the pouring temperature of magnesium alloy liquid is 610-660 DEG C. The light-weight lithium battery brushless multi-purpose saw is excellent in performance, convenient to use and practical, and more convenient and efficient working experience can be provided for a user; compared with a conventional aluminum alloy product, the improved magnesium alloy product has the advantages that the weight is reduced by more than 20%, the power is increased, the service life of a power supply is prolonged, and the effective power is increased by more than 10% and the service time of a battery is prolonged by more than 15%.

Description

Technical Field

[0001] The invention relates to a lithium-electric brushless saw, in particular to a lightweight lithium-electric brushless multi-purpose saw. Background Art

[0002] A lithium-ion brushless saw refers to an electric saw with a brushless motor and a lithium battery. Brushless lithium-ion electric saws have a longer lifespan, less noise, and run more smoothly than conventional brushed lithium-ion electric saws.

[0003] The brushless lithium electric saw adopts a brushless motor design, which has higher efficiency and longer service life than traditional motors; the brushless motor has no carbon brushes and commutators, so it reduces friction and wear and improves the durability of the tool; at the same time, the brushless motor can also provide a more stable power output, making cutting smoother. The brushless lithium electric saw uses lithium batteries as a power source, which has higher energy density and longer battery life; lithium batteries also have the advantages of no memory effect and low self-discharge rate, making the tool more convenient and practical; at the same time, the charging time of lithium batteries is relatively short, which can provide power support for the tool faster.

[0004] However, the existing lithium-powered brushless saw is relatively heavy and inconvenient to carry. When working, it is not only easy to make people tired, but also inconvenient to operate, and cannot meet the various usage needs of users. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention proposes a lightweight lithium-powered brushless multi-purpose saw with excellent performance, convenience and practicality, which can provide users with a more convenient and efficient working experience.

[0006] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is: A lightweight lithium-powered brushless multi-purpose saw comprises a casing. The casing material of the multi-purpose saw is a magnesium alloy. Thin-walled parts and thick-walled parts of the casing are manufactured and processed by hot chamber die casting and cold chamber die casting respectively. The process parameters of the magnesium alloy casing are controlled as follows: the preheating temperature of the magnesium alloy ingot is 130-190°C, and the pouring temperature of the magnesium alloy liquid is 610-660°C.

[0007] The present invention designs a casing with magnesium alloy as the main structural material, replacing conventional aluminum alloy to reduce weight. CAE technology is used to simulate and analyze the mechanical structure strength of the casing structure, and the lithium electric tool casing structure is optimized based on the material characteristics analysis of magnesium alloy and the influence of mechanical properties brought about by material changes.

[0008] Preferably, the preheating temperature of the magnesium alloy ingot is 160°C, and the pouring temperature of the magnesium alloy liquid is 630°C. The preheating temperature of the magnesium alloy ingot and the pouring temperature of the magnesium alloy liquid are two key parameters in the process, especially the pouring temperature, which has a significant effect on the hot cracking tendency of the casting. Experiments show that as the pouring temperature increases, the hot cracking tendency decreases, but when the pouring temperature exceeds 630°C, the hot cracking tendency gradually increases. This may be because at first, as the pouring temperature increases, the temperature distribution when the molten metal is filled tends to be uniform, and the thermal stress generated during the solidification process is small, thereby reducing the tendency of the casting to produce hot cracks; after the pouring temperature exceeds 630°C, the solidification of the casting becomes slow, the grains become coarse, and the tensile strength during the solidification process decreases, which increases the hot cracking tendency of the casting; therefore, the optimal pouring temperature can be obtained as 630°C.

[0009] Preferably, the multi-purpose saw includes a lithium battery pack intelligent monitoring system with a microcontroller as the core, and the lithium battery pack intelligent monitoring system includes a lithium battery pack, a voltage acquisition module, a current acquisition module, a temperature acquisition module and a microcontroller. The lithium battery pack is connected to the microcontroller through the voltage acquisition module, the current acquisition module and the temperature acquisition module respectively. The voltage acquisition module is used to obtain the voltage of the lithium battery pack and send it to the microcontroller, the current acquisition module is used to obtain the current of the lithium battery pack and send it to the microcontroller, and the temperature acquisition module is used to obtain the temperature of the lithium battery pack and send it to the microcontroller.

[0010] Preferably, the microcontroller is connected to the monitoring terminal via a communication module.

[0011] Preferably, the monitoring terminal is a computer or a mobile phone.

[0012] Preferably, the microcontroller is connected to an alarm.

[0013] The present invention designs a lithium battery pack intelligent monitoring system with a microcontroller as the core, and protects the charging and discharging of the lithium battery pack. The controller collects the voltage, current, and temperature parameters of the lithium battery pack in real time, providing a basis for dynamic protection control and remaining power estimation. At the same time, the display information of the monitoring terminal can be used to understand the battery usage status. During charging and discharging, if abnormal phenomena such as temperature, voltage, and current occur, the control system can effectively cut off the circuit, produce a protective effect, and send out a corresponding alarm signal.

[0014] Preferably, during the production of the magnesium alloy housing, the mold temperature is controlled at 170-230°C. More preferably, the mold temperature is controlled at 200°C. The mold temperature also has a certain influence on the thermal cracking tendency of the casting, and its rule is basically the same as the pouring temperature. If the mold temperature is too low, the cooling speed will be too fast, making the temperature distribution of the molten metal uneven, causing the casting to produce greater thermal stress during the solidification process, thereby increasing the tendency of the casting to produce thermal cracking; if the mold temperature is too high, the solidification of the casting will become slow, the grains will become coarse, and the tensile strength will be reduced during the solidification process, which will increase the tendency of the casting to produce thermal cracking.

[0015] Preferably, during the production process of the magnesium alloy casing, the pouring speed is controlled to be 40-80 m / s. More preferably, the pouring speed is controlled to be 60 m / s. The pouring speed also has a certain influence on the hot cracking tendency of the casting. The simulation experiment shows that: with the increase of the fast injection speed, the hot cracking tendency of the casting decreases. This is mainly because the high injection pressure corresponding to the high speed makes the structure of the casting denser, resulting in a decrease in the hot cracking tendency of the casting; when the fast injection speed is too high, the molten metal will move in the form of a jet, and the tendency of the casting to produce pores increases, thereby increasing the hot cracking tendency of the casting.

[0016] Compared with the prior art, the beneficial effects and advantages of the present invention are: The lightweight lithium-powered brushless multi-purpose saw of the present invention not only has excellent performance, is convenient and practical, but also can provide users with a more convenient and efficient working experience; the improved magnesium alloy product is more than 20% lighter than conventional aluminum alloy products, the product power is increased, and the power supply life is extended. The effective power of magnesium alloy products is increased by more than 10% compared with aluminum alloy products, and the battery life is increased by more than 15%. DETAILED DESCRIPTION

[0017] The technical scheme of the present invention is further specifically described below through examples, which are provided for the purpose of illustrating the present invention and are not intended to limit the present invention. Based on the examples in this application, all other examples obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0018] Aiming at the shortcomings of existing lithium-ion electric tools, the present invention conducts lightweight technology research and energy-saving optimization, and researches and develops a new product of efficient, intelligent, lightweight lithium-ion brushless multi-purpose saw.

[0019] The present invention designs a casing with magnesium alloy as the main structural material, replacing conventional aluminum alloy to reduce weight. CAE technology is used to simulate and analyze the mechanical structure strength of the casing structure, and the lithium electric tool casing structure is optimized based on the material characteristics analysis of magnesium alloy and the influence of mechanical properties brought about by material changes.

[0020] A lightweight lithium-powered brushless multi-purpose saw comprises a casing. The casing material of the multi-purpose saw is a magnesium alloy. The thin-walled parts and thick-walled parts of the casing are manufactured and processed by hot chamber die casting and cold chamber die casting respectively. A 130-190°C magnesium alloy ingot preheating process and a 610-660°C magnesium alloy liquid pouring temperature control process are adopted. The main research parameters include the magnesium alloy ingot preheating temperature, the magnesium alloy liquid pouring temperature, the mold temperature, the pouring speed, etc.

[0021] In specific implementation, the preheating temperature of the magnesium alloy ingot is 160°C, and the pouring temperature of the magnesium alloy liquid is 630°C. The preheating temperature of the magnesium alloy ingot and the pouring temperature of the magnesium alloy liquid are two key parameters in the process, especially the pouring temperature, which has a significant effect on the hot cracking tendency of the casting. Experiments show that as the pouring temperature increases, the hot cracking tendency decreases, but when the pouring temperature exceeds 630°C, the hot cracking tendency gradually increases. This may be because at first, as the pouring temperature increases, the temperature distribution when the molten metal is filled tends to be uniform, and the thermal stress generated during the solidification process is small, thereby reducing the tendency of the casting to produce hot cracks; after the pouring temperature exceeds 630°C, the solidification of the casting becomes slow, the grains become coarse, and the tensile strength during the solidification process decreases, which increases the hot cracking tendency of the casting; therefore, the optimal pouring temperature can be obtained as 630°C.

[0022] During the production of the magnesium alloy housing, the mold temperature is controlled at 170-230°C; more preferably, the mold temperature is controlled at 200°C. The mold temperature also has a certain influence on the thermal cracking tendency of the casting, and its rule is basically the same as the pouring temperature. If the mold temperature is too low, the cooling speed will be too fast, making the temperature distribution of the molten metal uneven, causing the casting to produce greater thermal stress during the solidification process, thereby increasing the tendency of the casting to produce thermal cracking; if the mold temperature is too high, the solidification of the casting will become slow, the grains will become coarse, and the tensile strength will decrease during the solidification process, which will increase the tendency of the casting to produce thermal cracking.

[0023] During the production of the magnesium alloy housing, the pouring speed is controlled at 40 to 80 m / s; more preferably, the pouring speed is controlled at 60 m / s. The pouring speed also has a certain influence on the hot cracking tendency of the casting. The simulation experiment shows that: with the increase of the fast injection speed, the hot cracking tendency of the casting decreases. This is mainly because the high injection pressure corresponding to the high speed makes the structure of the casting more compact, resulting in a decrease in the hot cracking tendency of the casting; when the fast injection speed is too high, the molten metal will move in the form of a jet, and the tendency of the casting to produce pores increases, thereby increasing the hot cracking tendency of the casting.

[0024] The multi-purpose saw includes a lithium battery pack intelligent monitoring system with a microcontroller as the core. The lithium battery pack intelligent monitoring system includes a lithium battery pack, a voltage acquisition module, a current acquisition module, a temperature acquisition module and a microcontroller. The lithium battery pack is connected to the microcontroller through the voltage acquisition module, the current acquisition module and the temperature acquisition module respectively. The voltage acquisition module is used to obtain the voltage of the lithium battery pack and send it to the microcontroller, the current acquisition module is used to obtain the current of the lithium battery pack and send it to the microcontroller, and the temperature acquisition module is used to obtain the temperature of the lithium battery pack and send it to the microcontroller.

[0025] The microcontroller is connected to a monitoring terminal via a communication module. The monitoring terminal is a computer or a mobile phone. The microcontroller is connected to an alarm.

[0026] The present invention designs a lithium battery pack intelligent monitoring system with a microcontroller as the core, and protects the charging and discharging of the lithium battery pack. The controller collects the voltage, current, and temperature parameters of the lithium battery pack in real time, providing a basis for dynamic protection control and remaining power estimation. At the same time, the display information of the monitoring terminal can be used to understand the battery usage status. During charging and discharging, if abnormal phenomena such as temperature, voltage, and current occur, the control system can effectively cut off the circuit, produce a protective effect, and send out a corresponding alarm signal.

[0027] The lightweight lithium-powered brushless multi-purpose saw of the present invention not only has excellent performance, is convenient and practical, but also can provide users with a more convenient and efficient working experience; the improved magnesium alloy product of the present invention is more than 20% lighter than conventional aluminum alloy products, the product power is increased, and the power supply life is extended. The effective power of magnesium alloy products is increased by more than 10% compared with aluminum alloy products, and the battery life is increased by more than 15%.

[0028] The present invention is described in detail above in conjunction with the embodiments, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A lightweight lithium-powered brushless multi-purpose saw, comprising a housing, characterized in that: The casing material of the multi-purpose saw is magnesium alloy, and the thin-walled parts and thick-walled parts of the casing are manufactured and processed by hot chamber die casting and cold chamber die casting respectively. The process parameters of the magnesium alloy casing are controlled as follows: the preheating temperature of the magnesium alloy ingot is 130-190°C, and the pouring temperature of the magnesium alloy liquid is 610-660°C.

2. The lightweight lithium-electric brushless multi-purpose saw according to claim 1, characterized in that: The preheating temperature of the magnesium alloy ingot is 160°C, and the pouring temperature of the magnesium alloy liquid is 630°C.

3. The lightweight lithium-electric brushless multi-purpose saw according to claim 1, characterized in that: The multi-purpose saw includes a lithium battery pack intelligent monitoring system with a microcontroller as the core. The lithium battery pack intelligent monitoring system includes a lithium battery pack, a voltage acquisition module, a current acquisition module, a temperature acquisition module and a microcontroller. The lithium battery pack is connected to the microcontroller through the voltage acquisition module, the current acquisition module and the temperature acquisition module respectively. The voltage acquisition module is used to obtain the voltage of the lithium battery pack and send it to the microcontroller, the current acquisition module is used to obtain the current of the lithium battery pack and send it to the microcontroller, and the temperature acquisition module is used to obtain the temperature of the lithium battery pack and send it to the microcontroller.

4. The lightweight lithium-electric brushless multi-purpose saw according to claim 2, characterized in that: The microcontroller is connected to the monitoring terminal via a communication module.

5. The lightweight lithium-electric brushless multi-purpose saw according to claim 3, characterized in that: The monitoring terminal is a computer or a mobile phone.

6. The lightweight lithium-electric brushless multi-purpose saw according to claim 3, characterized in that: The microcontroller is connected with an alarm.

7. The lightweight lithium-electric brushless multi-purpose saw according to claim 1, characterized in that: During the production process of the magnesium alloy casing, the mold temperature is controlled at 170-230°C.

8. The lightweight lithium-electric brushless multi-purpose saw according to claim 1, characterized in that: During the production process of the magnesium alloy casing, the pouring speed is controlled to be 40-80 m / s.