Handheld electric loop wire saw cutting machine

Abstract

The utility model relates to an electric cutting tool, in particular to a handheld electric loop wire saw cutting machine which comprises a handheld machine body shell, a driving device and a loop wire saw. The driving device comprises at least one driving motor and at least two wire wheels, the driving motor is fixed with the machine body shell, and the driving motor is in transmission connection with the wire wheels; the loop wire saw is installed on the wire wheel in a surrounding mode and rotates for cutting under the supporting and driving effects of the wire wheel. A tensioning supporting system is arranged in cooperation with the loop wire saw and used for enabling the loop wire saw to be in a tensioning state in the working process. A main control circuit board and a power supply system are fixed in the machine body shell, and a motor control module of the main control circuit board is connected with the driving motor and the power supply system. The cutting machine is reasonable in structural design, safe, environment-friendly and convenient to use and carry, and the safety and the universality of the loop wire saw cutting machine are greatly improved.

Description

Technical Field

[0001] This utility model relates to an electric cutting tool, and more particularly to a handheld electric circular saw cutting machine. Background Technology

[0002] Existing electric cutting tools, including commonly used angle grinders, band saws, circular saws, and chainsaws, have major drawbacks that can be considered from the following seven dimensions: 1. Narrow applicability: Different manual electric cutting tools have a narrow range of applications. Different materials and processing requirements necessitate different manual electric tools. Moreover, there is currently a lack of effective manual electric cutting tools for cutting hard and brittle materials and composite materials; 2. Noise and vibration: Using these tools generates significant noise and vibration, which may cause discomfort to the user and the surrounding environment. Most tools typically produce noise levels exceeding 100dB and vibrations of around 0.5g; 3. Safety: Traditional manual electric cutting machines have a high exposed cutting edge ratio and very high cutting speeds (up to 5000RPM or more). 1. **High Energy Consumption:** Electric cutting tools are heavy, and if a blade breaks, it could cause significant personal injury. 2. **High Power Consumption:** Electric cutting tools use electricity or fuel, generally consuming a lot of energy. Cutting machines typically have a power consumption of over 500W, but their efficiency is only around 30%. 3. **High Labor Intensity:** These tools usually require a certain level of experience and physical strength. Most cutting processes require continuous positive pressure exceeding 40N, significantly increasing the labor intensity. 4. **Poor Cutting Surface Quality and Wide Cut:** Due to the high load of cutting, the cutting surface is prone to burning, unevenness, and excessive removal of workpiece. 5. **Limited Cutting Surface:** Traditional power tools can generally only perform straight or planar cutting and cannot achieve small-curvature curve cutting.

[0003] With the increasing maturity of diamond wire cutting technology, integrating it into a portable, compact manual power tool for cutting various materials—not limited to metals, ceramics, jade, and other hard and brittle materials, as well as organic materials, composite materials, and materials with porous or complex structures (combinations of multiple materials)—is of great significance. This is especially true in recent years, with increasing demands for personal safety and health, including stricter control of dust and noise pollution. Extending diamond wire cutting technology to manual power tools will further optimize cutting processes, significantly reduce operator workload, improve the working environment, and decrease noise and dust pollution.

[0004] Chinese patent application CN116511599A discloses a handheld electric and manual integrated wire saw, including a wire saw body and a cutting device. The cutting device is located at the front end of the wire saw body. The wire saw body is formed by the left and right sides of the outer shell interlocking to form a hollow, enclosed whole. The cutting device is fixed to the outer shell with screws. A trigger is located at the bottom of the outer shell, and an electric / manual mode switching device is located on the side. The outer shell contains a drive device including a motor, a gear set, and a power module. One end of the motor is electrically connected to the power source, and the other end meshes with the gear set to drive the cutting wire. The device continuously rotates the motor to drive the cutting wire in a straight line. This invention has advantages such as low cost, wider functionality, low noise, low vibration, and lower energy consumption. However, the structure of this invention is similar to a traditional hand saw, requiring manual adjustment of the wire saw tension. Furthermore, safety issues also exist, requiring further improvement. Summary of the Invention

[0005] This utility model addresses the shortcomings of existing technologies by providing a handheld electric circular saw cutting machine with a reasonable structural design, safety and environmental protection, ease of use, and portability.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] Design a handheld electric circular saw cutting machine, including a handheld body housing, a drive unit and a circular saw; the drive unit includes at least one drive motor and at least two wire pulleys, the drive motor is fixed to the body housing, and the drive motor is connected to the wire pulleys via a transmission.

[0008] The circular saw is mounted around the wire wheel and rotates for cutting under the support and drive of the wire wheel.

[0009] A tensioning support system is provided in conjunction with the circular saw to keep the circular saw in a tensioned state during operation;

[0010] The main control circuit board and power supply system are fixed inside the casing. The motor control module of the main control circuit board is connected to the drive motor and the power supply system.

[0011] Furthermore, the spool rotation support is installed inside the machine housing, including a movable spool, which is movably and fixedly installed relative to the machine housing, and the tensioning support system is installed in cooperation with the movable spool.

[0012] Furthermore, the tensioning support system includes a supporting U-shaped block, a guide column, a spring, a movable back plate, a guide shaft, a linear bearing or slider mounted on the guide shaft, and a guide shaft fixing T-shaped block. The supporting U-shaped block and the guide shaft fixing T-shaped block are mechanically fixed to the machine body. The guide column is fixed from right to left in the corresponding positioning hole on the right side of the supporting U-shaped block. The spring passes through the guide column, and both ends of the spring are connected to the supporting U-shaped block and the movable back plate, respectively. The movable back plate has transverse through holes at its upper and lower ends, which are interference-fitted with the linear bearing or slider to achieve stable left and right movement of the movable back plate. The movable back plate fixing shaft core is used to fix the drive motor or the reel.

[0013] Furthermore, an electric push rod is provided on the right side of the tensioning support system to facilitate the installation and replacement of the wire saw. The electric push rod is fixed inside the machine body housing, and its telescopic end is connected to the movable back plate of the tensioning support system. The electric push rod is connected to the power supply via a three-position self-resetting switch. When the entire movable back plate is pushed to the left limit under the action of the power supply, the two wire pulleys are closest to each other, which facilitates the replacement of the wire saw. When the push rod retracts, the spring in the tensioning support system fully opens, the two wire pulleys move away from each other, and tension the wire saw installed on it.

[0014] Furthermore, it contains two wire reels, and the machine body housing is connected by two mounting cavities that correspond to and match the wire reels via a handle. Each mounting cavity houses one wire reel, and at least one wire reel is connected to a drive motor. A ring saw is mounted on both wire reels.

[0015] Furthermore, one of the two reels is a driving reel connected to the drive motor; the other is a driven reel, which is movably connected and installed on the machine body housing. The tensioning support system is installed inside the machine body housing in cooperation with the driven reel.

[0016] Furthermore, the driving wheel is a fixed wheel, and a first transmission mechanism is provided for connection with the drive motor; the first transmission mechanism includes a fixed wheel flange, a fixed wheel fixing bolt, a fixed wheel main shaft, a fixed wheel main shaft sliding bearing one, and a fixed wheel main shaft sliding bearing two. The outer rings of the fixed wheel main shaft sliding bearing one and the fixed wheel main shaft sliding bearing two are both interference-fitted with the left side hole of the inner wall of the machine body housing, and the inner rings of the fixed wheel main shaft sliding bearing one and the fixed wheel main shaft sliding bearing two are both interference-fitted with the fixed wheel main shaft. A fixed wheel is provided between the fixed wheel flange and the fixed wheel main shaft, and a fixed wheel fixing bolt is threadedly connected between the fixed wheel and the fixed wheel main shaft.

[0017] Furthermore, the driven wheel is a movable wheel, and a second transmission mechanism is correspondingly provided on the movable wheel. The second transmission mechanism includes a movable wheel flange, a movable wheel fixing bolt, a movable wheel main shaft coupling, a movable wheel main shaft, a movable wheel main shaft sliding bearing one, and a movable wheel main shaft sliding bearing two. The outer rings of both the movable wheel main shaft sliding bearing one and the movable wheel main shaft sliding bearing two are interference-fitted with the center of the movable back plate. The movable wheel main shaft is interference-fitted between the movable wheel main shaft sliding bearing one and the movable wheel main shaft sliding bearing two. The movable wheel main shaft coupling is also fixed relative to each other by screws. A driven wheel is provided between the movable wheel main shaft coupling and the movable wheel flange. A movable wheel fixing bolt is threadedly connected between the driven wheel and the movable wheel main shaft coupling.

[0018] Furthermore, the device contains two reels. The machine body housing consists of two mounting cavities that correspond to and match the reels, connected by a handle. Each mounting cavity houses one reel, and at least one reel is connected to a drive motor. A circular saw is mounted on both reels. The reel tensioning support system consists of a tensioning reel and a spring-loaded screw movably connected to the machine body housing. The lower end of the screw is connected to the tensioning reel via a tensioning reel bracket. The spring is positioned between the tensioning reel bracket and the screw. The circular saw passes through the tensioning reel.

[0019] Furthermore, the drive motor is a brushless motor, with the motor stator fixed to the housing, and the motor output shaft integrated with the external motor rotor; the motor output shaft is connected to a reel and rotates synchronously with the reel.

[0020] Furthermore, the main control circuit board includes a start / stop switch, a motor control module, and an opening / closing interlocking mechanism; the start / stop switch is fixed inside the handle of the machine body and is configured as a self-resetting switch or a self-locking switch; the opening / closing interlocking mechanism is located in the machine body housing, and the start / stop switch and the opening / closing interlocking mechanism are connected to the main control circuit board inside the machine body housing; the motor control module outputs control signals to connect to the inverter of the power control circuit, and the inverter output of the power control circuit is connected to the drive motor.

[0021] Furthermore, the opening and closing interlocking mechanism consists of two automatic switches connected in series; one of them is a capacitive inductive switch, which is embedded in the handheld part on one side of the machine body and is normally open by default; the other is a proximity switch. The proximity switch and the capacitive inductive switch output switch signals to the motor control module. The proximity switch detects the position of the moving back plate in real time. When the back plate fully springs back, the output stops and the handheld wire saw stops.

[0022] Furthermore, the main control circuit board also includes a steering monitoring circuit, which detects the status of the external steering switch and outputs a signal to the motor control module; the motor control module adjusts the inverter output of the power control circuit according to the received signal.

[0023] Furthermore, the housing is made of die-cast aluminum alloy or aluminum-magnesium alloy, or integrally injection molded plastic. A tool-removable front protective cover is fixed to the front end of the housing; a tool-removable rear protective cover is fixed to the rear end of the housing; and a circular saw through hole and a chip outlet are provided on the inner side of the lower end of the housing.

[0024] Furthermore, the circular saw is a metal wire electroplated, bonded, or brazed with abrasive; the abrasive is any one of diamond abrasive, cubic boron nitride abrasive, corundum abrasive, and silicon carbide abrasive, or a combination of any two or more abrasives; the circular saw is made of single-turn or multi-turn metal wire, and the metal wire is tungsten wire, steel wire, or a combination of both.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. This utility model relates to a handheld electric wire saw cutting machine, which presents a completely new structure. The structure is rationally designed, easy to use, and portable. A new housing was designed to fix and install the motor and drive the wire saw for efficient cutting. This extends diamond wire cutting technology to manual power tools, further optimizing cutting efficiency, significantly reducing operator workload, improving the working environment, and reducing noise and dust pollution. It can be used to cut various materials, with a load far lower than traditional manual power tools. This greatly improves the safety and versatility of the handheld electric wire saw cutting machine.

[0027] 2. This utility model of a handheld electric circular saw integrates diamond wire cutting technology into a portable and compact handheld power tool, enabling efficient cutting of high-strength metals, hard and brittle ceramic materials, and tough composite materials. It has greater versatility and can produce more complete cross-sections. Because of the narrow cutting width, the low cutting speed ensures effective cutting, effectively reducing the heat generated during cutting, thereby improving the surface quality of the cut surface and preventing burns.

[0028] Because the cutting width depends on the diameter of the circular saw, higher precision cutting can be achieved for different application scenarios. Currently, the cutting width can be reduced to about 0.3mm, which can effectively reduce material loss and dust generated during the cutting process. The traditional cutting width is generally 2-5mm.

[0029] 3. This utility model of a handheld electric circular saw further improves the control of dust and noise pollution. Facing higher requirements for personal safety and health, the use of a circular saw ensures effective cutting while maintaining a low cutting speed, preventing major safety accidents caused by wire breakage or other abnormalities.

[0030] Because of its narrow cutting width, the cutting speed is low while ensuring effective cutting, thus effectively reducing the vibration dose transmitted to the human body during the cutting process to approximately 0.02–0.03g, about 1 / 10 of the international standard. This significantly reduces the negative impact on human health during cutting. Using a circular saw effectively reduces noise during the cutting process, keeping the noise level around 50dB during no-load operation. For actual cutting of materials such as ceramics, jade, tiles, metals, and metal oxides, the noise level can be controlled below 70dB. This effectively reduces noise pollution and adverse health effects during cutting.

[0031] Because of the narrow cutting width, the cutting speed is low while ensuring effective cutting, which can also effectively reduce the user's workload. The cutting force during use is only about 3 to 5 N, which is only about 1 / 10 of that of traditional manual power tools.

[0032] 4. This utility model of a handheld electric circular saw cutting machine uses a self-resetting switch and an interlocking device in its main control circuit, greatly improving the safety of the machine. The interlocking sensors include a proximity switch and a capacitive sensing switch. When both the proximity switch and the capacitive sensing switch output a high level simultaneously, the motor is powered, ensuring the circular saw is correctly installed and the tool is properly held. If the circular saw mounted on the reel breaks unexpectedly under tension, the tensioning support system will push the movable back plate and the driven wheel power transmission system fixed to it to the rightmost end of the positioning hole in the machine body. The proximity switch's installation position and corresponding sensing range are precisely able to detect the movable back plate and the driven wheel power transmission system being pushed to the rightmost limit of the positioning hole, triggering the motor brake or stop, thus protecting the operator.

[0033] 5. This utility model of a handheld electric wire saw cutting machine is equipped with a tensioning support system to achieve tensioning of the wire saw, ensuring that the motor drives the wire saw to perform efficient cutting and improving cutting efficiency. On the right side of the tensioning support system, there is an electric push rod for easy installation and wire replacement of the wire saw. When the entire movable back plate is pushed to the left limit under the action of the power supply, the two wire wheels are closest to each other, which is convenient for replacing the wire saw. When the push rod retracts, the spring in the tensioning support system fully opens, the two wire wheels move away from each other and tension the wire saw installed on it. Attached Figure Description

[0034] Figure 1 and Figure 3 These are three-dimensional structural diagrams of the handheld electric circular saw cutting machine of this application from two different perspectives;

[0035] Figure 2 and Figure 4This is a three-dimensional structural diagram of the handheld electric circular saw cutting machine of this application after removing the protective cover and disassembling the motor, showing two different viewing angles.

[0036] Figure 5 This is a three-dimensional structural diagram of the handheld electric circular saw cutting machine of this application after only the protective cover has been removed;

[0037] Figure 6 for Figure 5 The diagram shows the exploded structure of a handheld electric circular saw cutting machine.

[0038] Figure 7 for Figure 2 The exploded structure diagram of the handheld electric ring saw cutting machine shown in the figure;

[0039] Figure 8 This is a cross-sectional structural diagram of the driven wheel and main shaft.

[0040] Figure 9 This is a cross-sectional structural diagram of the drive wheel and the main shaft power transmission section;

[0041] Figure 10 and Figure 11 These are rear view and front view structural diagrams of the fuselage shell, respectively;

[0042] Figure 12 and Figure 13 These are front view structural diagrams of the front and rear protective covers, respectively;

[0043] Figure 14.1 This is a cross-sectional view of the power output motor. Figure 14.2 , 14.3 A three-dimensional structural diagram of a power output motor from different perspectives;

[0044] Figure 15 Schematic diagram of power conversion circuit and battery protection circuit;

[0045] Figure 16 Circuit diagram for enabling the motor push rod to move back and forth;

[0046] Figure 17 This is the circuit schematic of the motor control system, where E1, E2, E3, E4, E5, and E6 are the MOSFETs of the DC power supply to three-phase power drive circuit, respectively.

[0047] The reference numerals in the figure are as follows:

[0048] 1. This utility model refers to the handheld electric circular saw cutting machine, i.e., the equipment and tools mentioned in the text;

[0049] 2. Body housing; 2a(n), multiple threaded holes for fixing the front and rear protective shells, n indicates more than one; 2b(n), multiple threaded holes for expanding additional tooling, n indicates more than one; 2c, chip removal hole; 2d, cutting line inlet / outlet hole 1; 2e, cutting line inlet / outlet hole 2; 2f, driven wheel movable hole; 2g, driving wheel fixing hole; 2h, threaded hole for fixing the battery; 2i, hole for fixing the battery power circuit board; 2j, threaded hole for fixing the motor; 2k, hole for positioning the motor; 2l, hole for fixing the circuit board; 2m, hole for fixing the tensioning mechanism; 2n, hole for positioning the driven wheel spindle; 2p, threaded hole for fixing the electric push rod; 2q, threaded hole for fixing the proximity switch; 2r, threaded hole for fixing the T-block of the guide rail;

[0050] 3. Top handle;

[0051] 4. Battery power supply system;

[0052] 5. Brushless motor driving the reel; 5a. Motor rotor; 5b. Motor stator; 5c. Output shaft flat position; 5d. Output shaft center threaded hole; 5e. Inner ring bearing retaining ring; 5f. Outer ring bearing retaining ring; 5g. Motor positioning ring; 5h. Motor mounting hole position;

[0053] 6. Tensioning support system; 6a. Support U-block; 6b. Guide column; 6c. Spring (compression spring); 6d. Movable back plate; 6e. Back plate cover; 6f. Guide shaft (slide rail); 6g. Linear bearing; 6h. Guide shaft fixing T-block;

[0054] 7. Electric linear actuator; 7a. Left and right moving linear actuator;

[0055] 8. Proximity switch;

[0056] 9. High-level and low-level relays;

[0057] 10. Motor control circuit board; 10a. Control module; 10b. Control signal output circuit; 10c. Current monitoring circuit; 10d. Steering monitoring circuit; 10e. High and low level monitoring circuit; 10f. Speed ​​monitoring circuit; 10g. Rotor monitoring circuit; 10h. Temperature monitoring circuit; 10i. Power drive circuit;

[0058] 11. Power switching circuit board;

[0059] 12. Charging / Power Supply Interface;

[0060] 13. Battery level display circuit board;

[0061] 14. Three-position self-resetting switch for the electric push rod of the line changing mechanism;

[0062] 15. Driven / Driven Gear Threaded Gear;

[0063] 16. Drive wheel power transmission system; 16a. Drive wheel pulley flange; 16b. Drive wheel fixing bolt; 16c. Drive wheel main shaft; 16d. Drive wheel main shaft sliding bearing one; 16e. Drive wheel main shaft sliding bearing two; 16f. Bearing washer;

[0064] 17. Driven wheel power transmission system; 17a. Driven wheel reel flange; 17b. Driven wheel fixing bolt; 17c. Driven wheel main shaft coupling; 17d. Driven wheel main shaft; 17e. Driven wheel main shaft sliding bearing one; 17f. Driven wheel main shaft sliding bearing two;

[0065] 18. Tool front protective cover; 18a(n), multiple holes for fixing the cover to the machine body housing, where n indicates more than one; 18b and 18c, respectively, are hand-held grip grooves;

[0066] 19. Tool rear protective cover; 19a(n), multiple holes for fixing the cover to the machine body, where n indicates more than one; 19b, tool self-reset switch; 19c and 19d, respectively, hand-held grip grooves; 19e, capacitive sensor switch;

[0067] 20. Power switching circuit (corresponding to 11); 20a. External power supply interface; 20b. Battery power supply;

[0068] 21. Battery protection circuit; 21a. Load terminal corresponds to the entire tool load;

[0069] 22. Equipment self-reset switch (corresponding to 19b);

[0070] 23. Steering switch;

[0071] 24. Interlocking mechanism;

[0072] 25. Temperature sensor;

[0073] 26. Hall effect sensor (motor positioning);

[0074] 27. Circular saw. Detailed Implementation

[0075] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0076] To better describe and illustrate the embodiments of this application, reference may be made to one or more accompanying drawings, but the additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the inventive creations of this application, the embodiments or preferred methods described herein.

[0077] Example 1

[0078] This utility model relates to a handheld electric circular saw cutting machine, comprising a handheld body housing 2, a drive unit, and a circular saw 27. The drive unit includes at least one drive motor and at least two wire pulleys. The drive motor is fixed to the body housing 2 and is connected to the wire pulleys via a transmission connection. The circular saw 27 is mounted around the wire pulleys and rotates for cutting under the support and drive of the wire pulleys. A tensioning support system is provided in conjunction with the circular saw 27 to keep the circular saw in a tensioned state during operation. Furthermore, a main control circuit board and a power supply system are fixed inside the body housing. The motor control module of the main control circuit board is connected to the drive motor and the power supply system. The wire pulleys are rotated and supported within the body housing.

[0079] See Figures 1-4 This embodiment of a handheld electric circular saw cutting machine includes a handheld body housing 2. The handheld body housing 2 houses a drive unit, a main control circuit board, and a power supply system. The outline of the body housing 2 is approximately two circles connected by a handle at the top. A wire wheel is installed in each of the two circular cavities of the body housing 2, with at least one wire wheel being driven by a drive motor. A circular saw 27 is mounted on both wire wheels. The drive motor and the wire wheel connected to it constitute the drive unit, which drives the circular saw mounted on the wire wheel to rotate. The body housing has a start / stop switch, a direction switch, and an interlocking mechanism. The start / stop switch, direction switch, and interlocking mechanism are connected to the main control circuit board inside the body housing 2. The main control circuit board connects to the drive motor and the power supply system. Furthermore, a tensioning mechanism is provided inside the body housing to cooperate with the circular saw. One of the two wire wheels is a movable wire wheel, which is movably and fixedly installed relative to the body housing. A tensioning support system is installed in cooperation with this movable wire wheel. The handle at the top of the casing here connects to the two circular inner cavities on both sides of the casing. It can be designed to be narrower, so that it also functions as a handle for easy carrying.

[0080] The overall appearance of the tool is as follows Figures 1 to 4 As shown.

[0081] Figure 1 and Figure 3 These are schematic diagrams of the overall structure of the handheld electric circular saw cutting machine of this application from different perspectives; Figure 2 and Figure 4The diagram shows the overall structure of the handheld electric circular saw cutting machine of this application after removing the protective cover and disassembling the motor from different viewing angles; a removable front protective cover 18 is fixed to the front of the machine body housing 2; a removable rear protective cover 19 is fixed to the rear of the machine body housing 2.

[0082] Figure 12 and Figure 13 These are front views of the front and rear protective covers of the tool. The front protective cover 18 and the rear protective cover 19 are also mechanically fixed to the front and rear of the housing 2, respectively, via... Figure 10 and Figure 11 The front and rear protective covers are secured using threaded holes 2a(n). Alternatively, a simpler method of securing and installing the front and rear protective covers can be achieved by replacing 2a(n) with a magnetic base or a snap-fit. Sealing rings can be added to the front and rear protective covers during installation for improved dust and water resistance under special operating conditions. The machine housing includes holes for the circular saw and a debris outlet.

[0083] For ease of carrying, a retractable hand handle 3 is provided on the top of the housing 2. The retractable hand handle 3 is mechanically fixed to the housing 2, typically with screws. The retractable hand handle extends and retracts through its own elasticity or an internal spring mechanism, saving space and facilitating transportation. The housing 2 (excluding the main body of the front and rear protective shells) can be made of die-cast aluminum alloy or aluminum-magnesium alloy, or integrally injection molded plastic.

[0084] Figure 5 The diagram shown is a rear view of the overall structure of this utility model (with the protective cover removed). Figure 6 for Figure 4 An exploded view of the main body of the handheld electric circular saw cutting machine applied for in this application; Figure 7 for Figure 2 This paper presents an exploded structural diagram of the main body of a handheld electric circular saw cutting machine.

[0085] This utility model relates to a handheld electric circular saw cutting machine, integrating one (or more) drive motors. Powered by a built-in battery or external direct power supply, it drives two or more reels within the handheld power tool to rotate the circular saw (a metal wire electroplated, bonded, or brazed with abrasives, including diamond, cubic boron nitride, corundum, and silicon carbide abrasives; the metal wire is a single or multiple turns of metal wire, typically tungsten or steel wire) at a certain speed, enabling the cutting of various materials. With manual operation or other tooling, it can cut materials of various shapes. The circular saw is a consumable and needs to be replaced promptly after passivation to ensure sufficient cutting efficiency and safety. The battery is typically a rechargeable lithium battery, or it can be powered directly by an external AC power source connected to an external charging interface.

[0086] Example 2

[0087] To ensure cutting effect and transmission efficiency, the handheld electric circular saw cutting machine of this utility model is equipped with a circular saw tensioning support system in cooperation with the circular saw or its drive and transmission mechanism wheel to achieve circular saw tensioning.

[0088] like Figure 5 , Figure 6 As shown, the handheld electric circular saw cutting machine of this embodiment differs from that of Embodiment 1 in that: the circular saw tensioning support system 6 further comprises a supporting U-shaped block 6a, guide posts 6b, springs (compression springs) 6c, a movable back plate 6d, a back plate cover 6e, two or more guide shafts (slide rails) 6f, a number of linear bearings 6g equal to the number of guide shafts, and guide shaft fixing T-shaped blocks 6h. The supporting U-shaped block 6a and the guide shaft fixing T-shaped blocks 6h are mechanically fixed directly to the threaded holes 2m and 2h inside the machine body housing by threads, respectively, to ensure the stability of the tensioning system housing itself; the guide posts 6b are fixed from right to left in the corresponding positioning holes on the right side of the supporting U-shaped block by screws. The number of guide posts depends on the workpiece being processed, generally 2 to 6. The length of the corresponding guide post is 20% to 60% of the left and right stroke of the tensioning support system, to ensure the stability of the springs (compression springs) 6c during extension and retraction; the springs (compression springs) 6c pass through the guide posts 6b and are connected to the supporting U-shaped block 6a and the movable back plate 6d on the left side, wherein the supporting U-shaped block 6a... The block and the movable back plate have corresponding holes to accommodate a portion of the spring (compression spring) 6c. The diameter of the hole is approximately 105% to 120% of the spring (compression spring) 6c, and the hole depth is approximately 5 to 15 mm, depending on the spring stiffness and total length. The spring stiffness can be selected from 2 N / m to 10 N / m to meet the tension and bow angle required when cutting different materials. The movable back plate 6d has through holes at the top and bottom, which are interference-fitted with the linear bearing 6g. The linear bearing 6g is mounted on the guide shaft (slide rail) 6f to achieve stable left and right movement of the movable back plate 6d. The fixed shaft of the movable back plate is used to fix the drive motor or the reel.

[0089] The movable backplate has a fixed shaft core that fixes the drive motor (connecting the reel), meaning it is driven by two motors, and both reels are power wheels; the movable backplate has a fixed shaft core that fixes the reel, which is the driven wheel.

[0090] The described reel tensioning mechanism includes a movable metal back plate, a guide rail, a spring, a shaft, and a bearing. In the single-motor configuration, the reel tensioning mechanism does not include a motor. The movable metal back plate fixes the shaft, which in turn fixes the reel. The guide rail stabilizes the back plate and, in conjunction with the spring, controls the horizontal tension. The bearing secures the reel to the shaft and ensures stable drive of the reel. In the dual-motor configuration, compared to the single-motor design, the movable back plate fixes the motor and drives it via a coupling to the reel. Furthermore, synchronization must be controlled in the dual-motor configuration.

[0091] The central part of the reel, which is used to fix it to the flange, is a metal housing. The metal part is designed to be solid or irregularly shaped and hollowed out, depending on the application scenario and stress conditions, in order to balance strength and weight. The outer ring part, which is used to install the ring saw, is made of organic material (such as polytetrafluoroethylene or polyurethane), and its circumference is designed with one or more grooves.

[0092] like Figure 8 and Figure 9 As shown, the transmission mechanism includes necessary rolling bearings and couplings. The rolling bearings are used to fix the position of the main shaft and ensure its stable rotation; the couplings are used to connect the motor output shaft and the reel shaft; when the motor's output shaft can be fitted with the reel shaft, the coupling is not required.

[0093] Example 3

[0094] See Figure 5 , Figure 6 The handheld electric wire saw cutting machine of this embodiment differs from that of Embodiment 2 in that: an electric push rod is provided on the right side of the tensioning support system. The electric push rod 7 has a built-in micro DC motor and gearbox. When the three-position self-resetting switch 14 of the electric push rod is closed, the push rod 7a can move left and right, and push the movable back plate 6d in the tensioning support system. Its self-resetting switch ensures that the electric push rod will not be continuously powered, protecting the DC motor. When the entire movable back plate 6d is pushed to the left limit, the drive wheels / driven wheels 15 on both sides of the tool are closest to each other, which facilitates the replacement of the wire saw 27. When the push rod 7a is retracted to the left limit, the compression spring in the tensioning support system fully opens. At this time, the drive wheels / driven wheels 15 on both sides of the tool move away from each other and tension the wire saw 27 mounted on it.

[0095] Specifically, such as Figure 13 As shown, the left handheld part 19b of the rear protective cover 19 is a self-resetting switch 22 for power supply. When a finger is pressed on it, the power supply system 21a of the tool is connected. At the same time, the right handheld part 19e is a capacitive sensing switch connected to the motor control circuit (part of the interlock switch 24). When a finger is detected to be close to the motor by about 2 to 5 mm, the high-level motor triggers the high-low level monitoring circuit 10e and gives a motor start command (as a necessary but not sufficient condition for starting the brushless motor 5 to rotate). Figure 16 The diagram shown is a schematic of a three-position self-resetting electric actuator switch circuit.

[0096] The wire sheave tensioning support system can also consist of a tensioning wire sheave and a spring-loaded screw movably connected to the machine housing 2. The lower end of the screw is connected to the tensioning wire sheave via a tensioning wire sheave bracket. The spring is located between the tensioning wire sheave bracket and the screw. The wire saw passes through the tensioning wire sheave.

[0097] By adjusting the screw, the tensioning wheel can be displaced to achieve tensioning of the wire saw. The spring acts as a buffer and also allows for adjustment of the wire saw tension.

[0098] Example 4

[0099] See Figure 5 , Figure 6 The handheld electric wire saw cutting machine of this embodiment differs from that of Embodiment 1 or 2 in that: the wire wheel adopts one driving wheel and one driven wheel, the drive motor (5) adopts a brushless motor, and the output shaft of the brushless motor is connected to the driving wheel; the motor stator 5b of the drive motor 5 is fixed in the machine body housing through the motor fixing hole, and the output shaft is integrated with the external motor rotor 5a; the motor rotor 5a and the motor stator 5b are connected through the inner ring bearing retaining ring 5e and the outer ring bearing retaining ring 5f, and the motor output shaft cooperates with the main shaft 16c of the driving wheel through the output shaft flat part 5c and achieves synchronous rotation; at the same time, the driving wheel wire wheel flange 16a and the driving wheel wire wheel 15 can be locked by fixing the output shaft center thread hole 5d through the driving wheel fixing bolt 16b.

[0100] The structure of a brushless motor is as follows Figure 14.1 14.2 and 14.3 are characterized by their motor rotor 5a, motor stator 5b, output shaft flat portion 5c, output shaft center threaded hole 5d, inner ring bearing retainer 5e, outer ring bearing retainer 5f, motor positioning ring 5g, and motor fixing hole 5h. In this design, the output shaft is integrated with the externally mounted motor rotor 5a; the motor stator 5b is fixed to the threaded hole 2j inside the housing 2 for fixing the motor via the motor fixing hole 5h; the motor rotor 5a and motor stator 5b are connected by the inner ring bearing retainer 5e and the outer ring bearing retainer 5f, and can rotate relative to each other; the motor output shaft, through its output shaft flat portion 5c, cooperates with the drive wheel main shaft 16c to achieve synchronous rotation; at the same time, the drive wheel spool flange 16a and the drive wheel spool 15 can be locked by fixing the output shaft center threaded hole 5d with the drive wheel fixing bolt 16b. Its open rotor and center hollowed-out design is the motor B-side design, such as... Figure 14.2 This facilitates more efficient heat dissipation and weight reduction; its stator part corresponds to surface A of the motor mounting hole 5h, such as... Figure 14.3 As a whole, by evenly applying thermal grease at 2j inside the motor and housing 2, the heat dissipation efficiency of the motor can be further improved and internal space can be saved.

[0101] The motor provides sufficient torque to drive the wire wheel and perform cutting. Its rated power ranges from 15W to 500W, rated torque from 0.2Nm to 5Nm, and rated speed from 200RPM to 5000RPM. This motor provides drive current to the stator, which in turn drives the wire wheel via the rotor's rotation, and consequently, the ring saw mounted on the wire wheel. Depending on the application, one or more motors can be used to meet higher cutting load requirements. Control of multiple motors requires synchronous settings via the motor control module on the main control PCB. Notably, the motor's permanent magnet can be fixed inside the equipment's back cover, embedding the motor rotor within the back cover for a highly compact design while providing effective heat dissipation.

[0102] like Figure 17 As shown, the main control PCB circuit board includes a motor control board and a relay module. The microcontroller motor control board is developed based on an MCU chip and is used to write the motor operating mode. After the motor is powered on, the written default mode is executed. The interlocking mechanism switch and the power switch output relay module. When the interlocking switch and the power switch output a high-level signal to the relay module, this module outputs the power supply module to supply power to the motor.

[0103] Figure 15 The diagram shows the power supply system. This system provides suitable current and voltage to the motor and control circuit board. The voltage range is 5–48V, and the current range is 0–50A. For DC motor drives, the power supply system includes a DC lithium battery, a charge / discharge control circuit board, a power display, and a power switching circuit. For AC motor drives, the system includes a current and voltage protection module and leakage protection.

[0104] The power supply can be either built-in battery power (i.e., battery power system 4) or external power (with an external power interface 20a). Battery power system 4 integrates a power switching circuit 20 and a battery (charge / discharge) protection circuit 21. When there is no external power supply, the tool defaults to using the built-in battery; when the external power supply voltage exceeds a set threshold, which is generally the minimum internal battery power supply voltage, the power switching circuit 20 switches the built-in battery power system 4 to external power. The built-in battery power system 4 is secured to the body housing 2 via threaded holes 2h for battery fixing.

[0105] Specifically, the power switching circuit 20, corresponding to the power switching circuit board 11, is installed inside the housing 2 and threaded in place. It uses a low-on-resistance PMOS transistor as the power switching switch. The battery charging / discharging protection circuit consists of a control IC, a MOSFET switch, a fuse, resistors, capacitors, and other components. The control IC outputs a control signal to turn on the MOSFET switch, connecting the lithium battery to the external circuit. When the battery voltage or circuit current exceeds a specified value, the control IC turns off the MOSFET switch, disconnecting the lithium battery from the external circuit and protecting the battery.

[0106] Example 5

[0107] The handheld electric wire saw cutting machine of this embodiment differs from the aforementioned embodiments in that: the power switch / start / stop switch is fixed inside the handle of the machine body and can be set as a self-resetting switch or a self-locking switch; when it is set as a self-resetting switch, it must be pressed down by hand to ensure normal operation; when it is set as a self-locking switch, the machine can be started for cutting simply by flipping the switch.

[0108] The aforementioned opening and closing interlocking mechanism consists of two automatic switches. One is a capacitive inductive switch, embedded in the handheld part on one side of the machine body and not exposed to the outside. Its default operating mode is normally open, and the handheld wire saw stops operating if the hand is completely removed from the handle. The other is a proximity switch that detects the position of the movable backplate in real time. When the backplate fully springs back (i.e., the corresponding wire saw breaks), the output stops and the handheld wire saw stops.

[0109] See Figure 13 The left handheld part 19b of the rear protective cover 19 is a self-resetting switch 22 for power supply. When a finger is pressed on it, the power supply system of the tool is connected. At the same time, the right handheld part 19e is a capacitive sensing switch connected to the motor control circuit (part of the interlock switch 24). When a finger is detected to be close to the motor by about 2 to 5 mm, the high-level motor triggers the high-low level monitoring circuit 10e and gives a motor start command (as a necessary but not sufficient condition for starting the brushless motor 5 of the drive wheel to rotate).

[0110] The proximity switch 8 is threaded into the housing 2 at the threaded hole 2q. It is used to sense the position of the movable back plate 6d in the tensioning support system 6. When the movable back plate 6d approaches the proximity switch 8 within 2-5mm, the proximity switch 8 outputs a low-level signal to the high / low level monitoring circuit of the motor control circuit board 10, triggering a motor brake or stop. The corresponding working scenario is that the ring saw 27 mounted on the wire wheel 15 unexpectedly breaks under tension, causing the tensioning support system to push the movable back plate 6d and the driven wheel power transmission system 17 fixed to it to the rightmost end of the 2n positioning hole in the housing 2. The installation position and corresponding sensing range of the proximity switch 8 are precisely able to detect that the movable back plate 6d and the driven wheel power transmission system 17 have been pushed to the rightmost limit of the hole 2n used to position the driven wheel spindle, triggering a motor brake or stop.

[0111] In addition to the battery power supply system 4, electric push rod 7, interlocking mechanism 24, power switching circuit 20, battery protection circuit 21, the electrical control system also includes brushless motor control circuit 10, power supply / charging interface 12, power display module 13, tool self-reset switch 19b, etc.

[0112] like Figure 17 As shown, the brushless motor control circuit 10 consists of a control module 10a, a control signal output circuit 10b, a current monitoring circuit 10c, a direction monitoring circuit 10d, a high / low level monitoring circuit 10e, a speed monitoring circuit 10f, a rotor monitoring circuit 10g, a temperature monitoring circuit 10h, and a power drive circuit 10i. The current monitoring circuit 10c monitors the supply current; if it exceeds the motor's load-bearing threshold (typically 10A to 20A), it stops supplying power and protects the motor. The direction monitoring circuit 10d monitors whether the corresponding terminal of the external switch is grounded, thus enabling forward and reverse rotation adjustment. The high / low level monitoring circuit 10e monitors the signal output by the interlocking sensor 24, which includes a proximity switch 8 and a capacitive sensing switch 19e. When both the proximity switch 8 and the capacitive sensing switch output a high level simultaneously, the motor is powered on, ensuring that the wire saw 27 is correctly installed and the tool is properly held in hand. The rotor position is monitored by outputting Hall sensor 26 to rotor position monitoring circuit 10g, and output to speed monitoring circuit 10f to achieve real-time speed monitoring, and fed back to control module 10a. Temperature sensor 25 installed on motor stator 5b monitors motor temperature in real time. If the temperature is too high, the threshold is generally 90 degrees Celsius, and a signal is output to control module 10a to stop the motor and protect it. Power drive circuit 10i inverts the DC power input from power supply 21a into three-phase power to drive motor rotor 5a, and combined with control signal output circuit 10b to achieve higher accuracy and safety monitoring.

[0113] Example 6

[0114] This embodiment of the handheld electric wire saw uses a drive motor that drives the driven wire wheel via an active wire wheel to achieve circuit transmission.

[0115] like Figure 6 As shown, the driving / driven wire sheave 15 consists of a sheave housing and a wire groove. It can be a single material or an assembly of independent materials. The housing provides support and is preferably made of high-strength, low-density materials such as aluminum alloy, magnesium-aluminum alloy, or carbon fiber. It is also geometrically multi-axially symmetrical and can be grooved to reduce weight, provided that sufficient dynamic balance is maintained. The wire groove drives the ring saw 27 and restricts its axial and radial degrees of freedom, ensuring that the ring saw is only driven in the circumferential direction.

[0116] Drive wheel power transmission system 16, such as Figure 9 The cross-sectional view shows the structure, which consists of a drive wheel flange 16a, drive wheel fixing bolts 16b, drive wheel main shaft 16c, drive wheel main shaft sliding bearing 16d, drive wheel main shaft sliding bearing 16e, and bearing washers 16f. Bearing washer 16f is optional and can prevent interference between the motor rotor and drive wheel main shaft sliding bearing 16d. However, additional waterproof washers can be added to the motor output shaft and drive wheel main shaft axially and radially for more effective waterproofing and dustproofing. The outer rings of drive wheel main shaft sliding bearings 16d and 16e are interference-fitted into the left side hole 2f inside the housing 2, while the inner rings of these two bearings are interference-fitted into the drive wheel main shaft 16c. At this point, the motor output shaft flat position 5c engages to achieve power transmission. The drive wheel flange 16a and drive wheel spindle 16c clamp the wheel 15 and tighten the drive wheel fixing bolt 16b onto the grinding wheel spindle 16c, thereby stably and without missing steps, outputting power from the motor 5 to the wheel 15.

[0117] Driven wheel power transmission system 17, such as Figure 8 The cross-sectional view shows that the driven wheel is composed of a driven wheel flange 17a, a driven wheel fixing bolt 17b, a driven wheel main shaft coupling 17c, a driven wheel main shaft 17d, a driven wheel main shaft sliding bearing one 17e, and a driven wheel main shaft sliding bearing two 17f. The outer rings of both driven wheel main shaft sliding bearing one 17e and driven wheel main shaft sliding bearing two 17f are slightly interference-fitted into the empty space in the middle area of ​​the movable back plate 6d. Figure 6 and Figure 7 The outer ring of the driven wheel spindle 17d has a boss that is interference-fitted with the driven wheel spindle sliding bearing 17e and the driven wheel spindle sliding bearing 17f to ensure the stability and expandability of the spindle rotation. The driven wheel spindle coupling 17c is fixed relative to each other by several screws, such as... Figure 8The driven wheel spindle coupling 17c and the driven wheel spool flange 17a clamp the driven wheel spool 15, and the driven wheel fixing bolts 17b further secure the driven wheel spool 15 and the driven wheel spindle coupling 17c, ensuring transmission stability, structural simplicity, and efficiency. Furthermore, this structure allows the driven wheel spindle 17d to be adjusted to a structure similar to the driving wheel spindle 16c, enabling the addition of another drive motor to the driven wheel system side, thus achieving a dual-motor solution.

[0118] This utility model relates to a handheld electric wire saw, extending diamond wire cutting technology to manual power tools. It combines the portability and high expandability of handheld tools with the high efficiency, low noise, and low energy consumption of a circular saw. It further optimizes cutting efficiency, significantly reduces operator workload, improves the working environment, and reduces noise and dust pollution. It can be used to cut various materials, with a load capacity far lower than traditional manual power tools.

[0119] The working principle of the handheld electric circular saw cutting machine provided by this utility model is as follows: During operation, powered by a built-in battery or external direct power supply, the operator first controls the equipment self-reset switch 22 through the tool self-reset switch 19a. The equipment self-reset switch 22 activates the motor control circuit board 10, which in turn activates the brushless motor 5. The output shaft of the brushless motor 5 rotates, driving the drive wheel spindle 16c to rotate, which in turn drives the drive wheel to rotate. Under the transmission action of the circular saw 27, the driven wheel 15 rotates, thus achieving the cutting work. At the same time, the current monitoring circuit 10c monitors the power supply current. If it exceeds the motor's load-bearing threshold, which is generally 10A-20A, the power supply is stopped and the motor is protected. The monitoring circuit 10d monitors whether the corresponding terminal is grounded by the external switch, thus enabling forward and reverse rotation adjustment. The high / low level monitoring circuit 10e monitors the signal output by the interlocking sensor 24, which includes a proximity switch 8 and a capacitive sensing switch. When both the proximity switch 8 and the capacitive sensing switch output a high level simultaneously, the motor is powered on. This ensures that the loop saw 27 is correctly installed and the tool is held normally. The Hall sensor 26 outputs the signal to the brushless motor rotor position monitoring circuit 10g to monitor the rotor position, and outputs it to the speed monitoring circuit 10f to monitor the speed in real time, which is then fed back to the control module 10a. The temperature sensor 25, installed on the stator of the brushless motor, monitors the speed in real time. The motor temperature is monitored. If the temperature is too high, typically 90 degrees Celsius, a signal is output to the control module 10a to stop the motor and protect it. The power drive circuit 10i inverts the DC power input from the power supply 21a into three-phase power for the brushless motor rotor, and combines it with the control signal output circuit 10b to achieve higher precision and safety monitoring. When the wire saw 27 comes into contact with the material, the resistance of the material causes the arc angle of the wire saw 27 to change. This causes the movable back plate 6d to move to the right under the action of the direct bearing 6g and the guide column 6b, while simultaneously causing the spring 6c to be elastically compressed. Under the elastic force of the spring 6c, the tension of the wire saw 27 always meets the cutting requirements. When the movable back plate... When position 6d is within 2-5mm of proximity switch 8, proximity switch 8 outputs a low-level signal to the high / low level monitoring circuit of motor control circuit board 10, and executes motor braking or stopping. The corresponding working scenario is that the ring saw 27 mounted on the wire wheel 15 accidentally breaks under tension, causing the tensioning support system to push the movable back plate 6d and the driven wheel power transmission system 17 fixed on its movable back plate 6d to the rightmost end of the machine body housing 2. The installation position and corresponding sensing range of proximity switch 8 can just detect that the movable back plate 6d and the driven wheel power transmission system 17 have been pushed to the rightmost limit of the positioning hole, and execute motor braking or stopping, thereby protecting the workers.When the wire saw 27 needs to be replaced, the electric push rod 7 can move left and right when the three-position self-resetting switch 14 of the wire changing mechanism is engaged. The telescopic end of the electric push rod 7 pushes the movable back plate 6d, while the self-resetting switch ensures that the electric push rod 7 will not be continuously powered, protecting the DC motor. When the entire movable back plate 6d is pushed to the left limit, the driving wheel and the driven wire wheel 15 are closest to each other, facilitating the replacement of the wire saw 27. When the telescopic end of the electric push rod 7 retracts to the right limit, the compression spring in the tensioning support system fully opens, at which point the driving wheel and the driven wire wheel 15 move away from each other and tension the wire saw 27 mounted on it, thus completing the replacement of the wire saw 7. This utility model greatly improves the universality and safety of the handheld electric wire saw cutting machine.

[0120] It is worth noting that, in the above embodiments, the battery power supply system 4 can be a 6-FM-12 battery, the brushless motor 5 can be a KX2006A brushless motor, the electric actuator 7 can be an SKA-F electric actuator, the proximity switch 8 can be an IM05-0B8PS-ZT1 proximity switch, the motor control circuit board 10 can be an MT2-87 circuit board, the power switching circuit board 11 can be a 202208005 circuit board, the high / low level relay 9 can be an AQH3223 solid-state relay, the power display circuit board 13 can be a JAYOS circuit board, and the steering switching... Switch 23 can be an LW21-16 / 4.6155.4 universal changeover switch. Temperature sensor 25 and Hall sensor 26 can be selected from commercially available accessories as needed. The motor control circuit board 10 controls the brushless motor 5, electric push rod 7, proximity switch 8, high and low level relay 9, temperature sensor 25 and Hall sensor 26 using methods commonly used in the prior art. The power switching circuit board 11 controls the battery power supply system 4 and the direction switching switch 23 using methods commonly used in the prior art. The power display circuit board 13 controls the battery power supply system 4 using methods commonly used in the prior art.

[0121] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A handheld electric ring saw cutting machine, comprising a handheld body shell, a driving device and a ring saw; characterized in that: the driving device comprises at least one driving motor, at least two wire wheels, the driving motor and the body shell are fixed, and the driving motor is in transmission connection with the wire wheels; the ring saw is installed around the wire wheels and rotates for cutting under the support and driving action of the wire wheels; a tensioning support system is arranged in cooperation with the ring saw to keep the ring saw in a tensioning state during operation; a main control circuit board and a power supply system are fixed in the body shell, and a motor control module of the main control circuit board is connected with the driving motor and the power supply system.

2. The hand-held electrically powered ring saw cutting machine according to claim 1, characterized in that the wire wheel rotating support is installed in the body shell, and the wire wheel rotating support comprises an active wire wheel, the active wire wheel is movably fixed to the body shell, and the tensioning support system is installed in cooperation with the active wire wheel.

3. The hand-held electrically powered ring saw cutting machine according to claim 2, characterized in that: the tensioning support system comprises a support U-shaped block, a guide column, a spring, a movable back plate, a guide shaft, a linear bearing or a sliding block installed on the guide shaft, and a guide shaft fixed T-shaped block, the support U-shaped block and the guide shaft fixed T-shaped block are mechanically fixed to the body shell, the guide column is fixed in a corresponding positioning hole on the right side of the support U-shaped block from right to left, the spring passes through the guide column, the spring is connected to the support U-shaped block and the movable back plate at both ends, and through holes are horizontally arranged at the upper end and the lower end of the movable back plate, the through holes are in interference fit with the linear bearing or the sliding block to realize stable movement of the movable back plate in the left-right direction, and the movable back plate fixed shaft core is used for fixing the driving motor or the wire wheel.

4. The hand-held electrically powered ring saw cutting machine according to claim 3, characterized in that: an electric push rod is arranged on the right side of the tensioning support system to facilitate installation and wire replacement of the ring saw, the electric push rod is fixed in the body shell, the extension end of the electric push rod is connected to the movable back plate in the tensioning support system, the electric push rod is connected to the power supply through a three-gear self-resetting switch, and when the entire movable back plate is pushed to the left limit under the action of the power supply, the two wire wheels are closest to each other, so that the ring saw is replaced; when the push rod is retracted, the spring in the tensioning support system is fully opened, and the two wire wheels are away from each other and the ring saw installed thereon is tensioned.

5. A hand-held electrically powered circular saw according to any one of claims 1-4, characterized in that: the body shell adopts two installation cavities corresponding to the two wire wheels, the installation cavities are connected through handle parts, one wire wheel is installed in each installation cavity, at least one wire wheel is connected with the driving motor, and the ring saw is installed on the two wire wheels.

6. The hand-held electrically powered ring saw cutting machine according to claim 5, characterized in that: one of the two wire wheels is a driving wheel connected with the driving motor, and the other is a driven wheel movably connected to the body shell, and the tensioning support system is arranged in the body shell in cooperation with the driven wheel.

7. The hand-held electrically powered ring saw cutting machine according to claim 6, characterized in that The driving motor is connected with the first transmission mechanism; the first transmission mechanism comprises a fixed wheel flange, a fixed wheel fixing bolt, a fixed wheel spindle, a fixed wheel spindle sliding bearing one and a fixed wheel spindle sliding bearing two, the outer rings of the fixed wheel spindle sliding bearing one and the fixed wheel spindle sliding bearing two are in interference fit with the left hole position of the inner wall of the fuselage shell, the inner rings of the fixed wheel spindle sliding bearing one and the fixed wheel spindle sliding bearing two are in interference fit with the fixed wheel spindle, and the fixed wheel is arranged between the fixed wheel flange and the fixed wheel spindle.

8. The hand-held electrically powered ring saw cutting machine according to claim 7, characterized in that: The driven wheel is a movable wheel, and the movable wheel is provided with a second transmission mechanism thereon, the second transmission mechanism comprises a movable wheel flange, a movable wheel fixing bolt, a movable wheel spindle coupling, a movable wheel spindle, a movable wheel spindle sliding bearing one and a movable wheel spindle sliding bearing two; wherein: the outer rings of the movable wheel spindle sliding bearing one and the movable wheel spindle sliding bearing two are in interference fit with the middle part of the movable back plate, and the movable wheel spindle is in interference fit between the movable wheel spindle sliding bearing one and the movable wheel spindle sliding bearing two, and the movable wheel spindle coupling is also relatively fixed by a screw, and the movable wheel spindle coupling and the movable wheel flange are provided with the driven wheel therebetween, and the driven wheel and the movable wheel spindle coupling are threadedly connected with the movable wheel fixing bolt.

9. The hand-held electrically powered ring saw cutter of claim 1, wherein: Two wire wheels are arranged, the fuselage shell is connected with the two wire wheels through the handle, one wire wheel is arranged in each mounting cavity, and at least one wire wheel is connected with a driving motor; and a ring saw is arranged on the two wire wheels; a tensioning wire wheel and a screw rod provided with a spring are movably connected to the fuselage shell through a tensioning wire wheel support, the lower end of the screw rod is connected with the tensioning wire wheel through the tensioning wire wheel support, the spring is arranged between the tensioning wire wheel support and the screw rod, and the ring saw passes through the tensioning wire wheel.

10. The hand-held electrically powered circular saw according to any one of claims 1-4, 6-9, characterized in that: The driving motor is a brushless motor, the motor stator part is fixed to the fuselage shell, and the motor output shaft and the external motor rotor are integrated; the motor output shaft is connected with the wire wheel and rotates synchronously with the wire wheel.

11. The hand-held electrically powered ring saw cutting machine according to claim 10, characterized in that: The main control circuit board comprises a start-stop switch, a motor control module and a switch interlocking mechanism; the start-stop switch is fixed to the inner side of the handle of the machine body and is arranged as a self-resetting switch or a self-locking switch; the switch interlocking mechanism is arranged in the fuselage shell, the start-stop switch and the switch interlocking mechanism are connected with the main control circuit board in the fuselage shell, the motor control module outputs a control signal connected with an inverter of a power control circuit, and the inverter of the power control circuit is connected with the driving motor.

12. The hand-held electrically powered ring saw cutting machine according to claim 11, characterized in that: The switch interlocking mechanism comprises two automatic switches in series; one is a capacitive sensing switch embedded in one side of the machine body, and the default working mode is normally open; and the other is a proximity switch, the proximity switch and the capacitive sensing switch output switch signals connected with the motor control module, the proximity switch detects the position of the movable back plate in real time, and when the back plate is completely bounced back, the output is stopped and the handheld ring saw is stopped.

13. A hand-held electrically powered ring saw cutting machine according to claim 11 or 12, characterized in that: The master control circuit board further comprises a steering monitoring circuit, which detects the state of an external steering switch and outputs a signal to the motor control module; the motor control module adjusts the inverter output of the power control circuit according to the received signal.

14. The hand-held electrically powered ring saw cutter of claim 10, wherein: The fuselage shell is made of aluminum alloy or aluminum-magnesium alloy by pressure casting or plastic by integral injection molding, a tool detachable front protective cover plate is fixed on the front end face of the fuselage shell, a tool detachable rear protective cover plate is fixed on the rear end face of the fuselage shell, and a ring saw through hole and a debris outlet are arranged on the inner side of the lower end of the fuselage shell.

15. The hand-held electrically powered ring saw cutting machine according to any one of claims 1-4, 6-9, 11, 12, 14, characterized in that, The ring saw is a metal wire coated with or fixed with or brazed with abrasive; the abrasive is any one of diamond abrasive, cubic boron nitride abrasive, corundum abrasive and silicon carbide abrasive, or a combination of any two or more abrasives; the ring saw is formed by winding a single turn or multiple turns of metal wire, and the metal wire is tungsten wire, steel wire or a combination of the two.

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