Portable lithium battery chain saw with anti-chain jamming self-stop system

Abstract

The utility model discloses a portable lithium electric chain saw with anti -stuck chain self -stop system, include: lithium electric chain saw body, lithium electric chain saw body's drive motor output shaft one end fixed mounting has first tooth disc, lithium electric chain saw body's saw plate one end is in -built type rotation and is installed with second tooth disc, and the outer surface of second tooth disc and first tooth disc is engaged and is sleeved with saw chain, and the outer surface one end fixed mounting of saw chain has brake plate, and brake plate can be pressed by emergency stop mechanism, and emergency stop mechanism fixed mounting is in saw plate one end, and the outer surface of emergency stop mechanism is sleeved with the cover, and the cover fixed mounting is in lithium electric chain saw body's outer surface one end. The application is through the design of emergency stop mechanism, when saw chain is stuck, can respond to saw chain clamping brake stop automatically, and through the clamping of saw chain still can avoid the derailment saw chain being thrown out at high speed, prevent the operator being splashed chain cuts, impact, reduce the probability of safety accident.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery chainsaw technology, specifically a portable lithium battery chainsaw with an anti-jamming self-stop system. Background Technology

[0002] Lithium-ion chainsaws are a type of power tool widely used in pruning, logging, and other applications. They consist of a battery pack, control board, brushless motor, braking device, chain plate, and saw chain. The product has many advantages, such as high power, low vibration, high sawing efficiency, and low logging cost.

[0003] Chinese patent CN209435859U discloses a lightweight lithium-ion battery chainsaw, including a storage box, a brake motor, and a stepper motor. A first handle is fixed to one end of the storage box, and a switch is installed inside the first handle. A second handle is fixed to the upper surface of the storage box. A battery pack is installed inside the storage box, and a brake motor is also installed inside. A saw chain is mounted outside the first gear, and a support plate is installed inside the saw chain. A connecting rod is installed in the middle of the support plate, and one end of the connecting rod is connected to one end of a lead screw. A support wheel is installed at the other end of the lead screw. A mounting plate is fixed inside the storage box, and a limit shaft is installed at the bottom of the mounting plate. A second gear is located on the side of the limit shaft, and a groove is formed on the side of the second gear. This lightweight lithium-ion battery chainsaw facilitates chain tensioning and enables emergency braking, improving the safety performance of the device.

[0004] However, the aforementioned lightweight lithium-ion chainsaw cannot detect and trigger a shutdown mechanism in time when the chain jams, thus making it difficult to avoid equipment damage or chain breakage and derailment caused by chain jamming. Utility Model Content

[0005] The purpose of this utility model is to provide a portable lithium-ion chainsaw with an anti-jamming chain self-stop system to solve the problem mentioned in the background art that when the chain jams, it cannot be detected in time and the shutdown mechanism cannot be triggered, which leads to equipment damage due to overload, chain breakage and derailment, and may even endanger the safety of operators.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A portable lithium-ion chainsaw with an anti-jamming self-stop system includes: a lithium-ion chainsaw body; a first toothed disc fixedly mounted on one end of the output shaft of the drive motor of the lithium-ion chainsaw body; a second toothed disc rotatably mounted embedded in one end of the saw blade of the lithium-ion chainsaw body; a saw chain meshing with the outer surface of the second toothed disc and the first toothed disc; a brake plate fixedly mounted on one end of the outer surface of the saw chain; the brake plate can be pressed by an emergency stop mechanism; the emergency stop mechanism is fixedly mounted on one end of the saw blade; a protective cover is fitted on the outer surface of the emergency stop mechanism; and the protective cover is fixedly mounted on one end of the outer surface of the lithium-ion chainsaw body.

[0008] Preferably, the brake plate can be driven to contact one end of the saw blade as the first toothed disc rotates.

[0009] Preferably, a Hall sensor is embedded at one end of the saw blade, the Hall sensor is horizontally opposite to the second toothed disc, the signal transmitting end of the Hall sensor is connected to the signal receiving end of the controller, and the control output end of the controller is electrically connected to the electrical control end of the emergency stop mechanism and the drive motor of the lithium battery chainsaw body.

[0010] Preferably, the Hall sensor and the controller are model AH3503 and ESP32-WROOM-32D, respectively.

[0011] Preferably, the emergency stop mechanism includes an electric push rod, which is rotatably mounted on one end of the outer surface of the lithium battery chainsaw body and covered by a protective cover. One end of the piston rod of the electric push rod is rotatably connected to a first connecting arm, and the other end of the first connecting arm is rotatably mounted on one end of a mounting plate. The mounting plate is fixedly mounted on one end of the saw blade. One end of the outer surface of the first connecting arm is rotatably mounted to a second connecting arm, and the other end of the second connecting arm is rotatably mounted to a push rod. The push rod slides through one end of the mounting plate and slides out from inside the protective cover.

[0012] The electric push rod is controlled by a controller.

[0013] Preferably, a third connecting arm is rotatably mounted on one end of the push rod, and the other end of the third connecting arm is rotatably mounted on one end of the saw blade. Brake pads are fixedly mounted on both the upper and lower surfaces of the third connecting arm, and the brake pads are flush with the brake plate.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. Through the design of the first toothed disc, the second toothed disc, the Hall sensor, the saw chain, the brake plate and the emergency stop mechanism, when cutting wood, the drive motor in the lithium battery chainsaw body can be started to drive the first toothed disc to rotate. The rotating first toothed disc can drive the saw chain to drive the second toothed disc to rotate. During the rotation of the second toothed disc, the rotation speed will be detected by the Hall sensor and the rotation speed signal will be transmitted to the controller.

[0016] When the saw chain jams due to complex wood grain or obstructions, the rotation speed of the second toothed disc will suddenly decrease or stop. After detecting this abnormal speed change, the Hall sensor will immediately transmit the abnormal signal to the controller. Upon receiving the signal, the controller will quickly make a judgment and immediately cut off the power to the drive motor to stop it from running, preventing the motor from being overloaded and damaged due to chain jamming. At the same time, the controller will also send a start command to the emergency stop mechanism to quickly clamp the brake plate. Since the brake plate is fixed to the saw chain, the strong clamping of the brake plate by the emergency stop mechanism can quickly brake the saw chain and clamp it to one end of the saw blade, thus preventing the saw chain from continuing to run in a jammed state. This can effectively prevent dangerous situations such as saw chain breakage and derailment. By clamping the saw chain, it can also prevent a derailed saw chain from being thrown out at high speed, preventing operators from being cut or hit by flying chain, reducing the probability of safety accidents. In complex wood cutting scenarios, it can effectively avoid the violent vibration and loss of control of the equipment caused by chain jamming, providing a safe working environment for operators.

[0017] 2. Through the design of the electric push rod, first connecting arm, second connecting arm, push rod, third connecting arm, and clamping brake, the controller will quickly cut off the power to the drive motor the moment the saw chain jams. This effectively avoids the motor burning out due to continuous overload and damage to the internal windings, significantly extending the motor's service life. At the same time, the controller will also send a signal to the electric push rod and push the piston rod. The piston rod will then push the first connecting arm, causing the second connecting arm to rotate around the first connecting arm. During this process, the driven second connecting arm will push the push rod, which is rotatably connected at its other end, to slide out from inside the cover. When the push rod slides out from inside the cover, the third connecting arm, which is rotatably connected at its end, will be forced to make a circular motion around the fixed fulcrum on the saw blade. The movement, and because the third connecting arm and the push rod are arranged at an obtuse angle, the linear motion of the push rod is converted into a rapid flipping motion of the third connecting arm, forming a closing effect similar to a "clamp". As the third connecting arm flips, it causes the clamping brake pads on the upper and lower surfaces to quickly close towards the brake plate, generating a large frictional force at the moment of contact with the brake plate, tightly clamping the brake plate to one end of the saw blade. In this process, according to the lever principle, this linkage structure will generate a force amplification effect during the movement, enabling the electric push rod to convert a small pushing force into a strong clamping force on the brake plate by the clamping brake pads. This allows it to respond automatically in case of danger, providing reliable safety protection for the operator and reducing safety risks during operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the first and second toothed discs of this utility model;

[0020] Figure 3 This is a schematic diagram of the emergency stop mechanism of this utility model.

[0021] In the diagram: 1. Lithium-ion battery chainsaw body; 101. Saw blade; 102. Second toothed disc; 103. Hall sensor; 104. Protective cover; 105. Saw chain; 106. Brake plate; 107. First toothed disc; 2. Emergency stop mechanism; 201. Electric push rod; 202. Mounting plate; 203. First connecting arm; 204. Second connecting arm; 205. Push rod; 206. Third connecting arm; 207. Brake pad. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-3 This embodiment provides the following technical solution:

[0024] like Figures 1-2 As shown, a portable lithium-ion chainsaw with an anti-jamming self-stop system includes: a lithium-ion chainsaw body 1; a first toothed disc 107 is fixedly mounted on one end of the output shaft of the drive motor of the lithium-ion chainsaw body 1; a second toothed disc 102 is rotatably mounted embedded in one end of the saw blade 101 of the lithium-ion chainsaw body 1; a saw chain 105 is fitted onto the outer surface of the second toothed disc 102 and the first toothed disc 107; a brake plate 106 is fixedly mounted on one end of the outer surface of the saw chain 105; the brake plate 106 can be braked by an emergency stop mechanism 2; the emergency stop mechanism 2 is fixedly mounted on one end of the saw blade 101; a cover 104 is fitted onto the outer surface of the emergency stop mechanism 2; and the cover 104 is fixedly mounted on one end of the outer surface of the lithium-ion chainsaw body 1. The brake plate 106 can be driven to contact one end of the saw blade 101 as the first toothed disc 107 rotates. A Hall sensor 103 is embedded at one end of the saw blade 101. The Hall sensor 103 is horizontally opposite the second toothed disc 102. The signal transmitting end of the Hall sensor 103 is connected to the signal receiving end of the controller, while the control output end of the controller is electrically connected to the electrical control end of the emergency stop mechanism 2 and the drive motor of the lithium battery chainsaw body 1. The Hall sensor 103 and the controller are model AH3503 and ESP32-WROOM-32D, respectively.

[0025] Through the design of the first toothed disc 107, the second toothed disc 102, the Hall sensor 103, the saw chain 105, the brake plate 106 and the emergency stop mechanism 2, when cutting wood, the drive motor in the lithium battery chainsaw body 1 can be started to drive the first toothed disc 107 to rotate. The rotating first toothed disc 107 can drive the saw chain 105 to drive the second toothed disc 102 to rotate. During the rotation of the second toothed disc 102, the Hall sensor 103 will detect the rotation speed and transmit the speed signal to the controller.

[0026] When the saw chain 105 jams due to complex wood grain or obstruction by foreign objects, the rotation speed of the second toothed disc 102 will suddenly decrease or stop. After detecting this abnormal speed change, the Hall sensor 103 will immediately transmit the abnormal signal to the controller. Upon receiving the signal, the controller will quickly make a judgment and immediately cut off the power to the drive motor, stopping it from operating and preventing overload damage to the motor due to chain jamming. Simultaneously, the controller will also send a start command to the emergency stop mechanism 2, causing it to quickly clamp the brake plate 106. Since the brake plate 106 is fixed to the saw chain 105, as the emergency stop mechanism... The strong clamping of the brake plate 106 by the stopping mechanism 2 can quickly brake the saw chain 105 and clamp it to one end of the saw plate 101, thereby preventing the saw chain 105 from continuing to run in a jammed state. This can effectively prevent dangerous situations such as the saw chain 105 breaking or derailing. By clamping the saw chain 105, it can also prevent the derailed saw chain 105 from being thrown out at high speed, preventing the operator from being cut or hit by the flying chain, reducing the probability of safety accidents. In complex wood cutting scenarios, it can effectively prevent the equipment from violently vibrating and losing control due to chain jamming, providing a safe working environment for the operator.

[0027] like Figure 3 As shown, the emergency stop mechanism 2 includes an electric push rod 201, which is rotatably mounted on one end of the outer surface of the lithium-ion chainsaw body 1 and covered by a cover 104. One end of the piston rod of the electric push rod 201 is rotatably connected to a first connecting arm 203, and the other end of the first connecting arm 203 is rotatably mounted on one end of a mounting plate 202. The mounting plate 202 is fixedly mounted on one end of the saw blade 101. A second connecting arm 204 is rotatably mounted on one end of the outer surface of the first connecting arm 203, and a push rod 205 is rotatably mounted on the other end of the second connecting arm 204. The push rod 205 slides through one end of the mounting plate 202 and slides out from inside the cover 104. The electric push rod 201 is controlled by a controller. A third connecting arm 206 is rotatably mounted on one end of the push rod 205, and the other end of the third connecting arm 206 is rotatably mounted on one end of the saw plate 101. Brake pads 207 are fixedly mounted on both the upper and lower surfaces of the third connecting arm 206, and the brake pads 207 are flush with the brake plate 106.

[0028] Through the design of the electric push rod 201, the first connecting arm 203, the second connecting arm 204, the push rod 205, the third connecting arm 206, and the clamping brake 207, the controller will quickly cut off the power to the drive motor at the moment the saw chain 105 jams, effectively preventing the motor from burning out due to continuous overload and damage to the internal windings, and significantly extending the motor's service life. At the same time, the controller will also send a signal to the electric push rod 201 and push the piston rod, which will push the first connecting arm 203 to drive the second connecting arm 204 to rotate around the first connecting arm 203. During this process, the driven second connecting arm 204 can push the push rod 205, which is rotatably connected at its other end, to slide out from inside the cover 104. When the push rod 205 slides out from inside the cover 104, the third connecting arm 206, which is rotatably connected at its end, will be forced to rotate around the saw blade 101. The fixed fulcrum makes circular motion, and because the third connecting arm 206 and the push rod 205 are arranged at an obtuse angle, the linear motion of the push rod 205 is converted into the rapid flipping action of the third connecting arm 206, forming a closing effect similar to a "clamp". As the third connecting arm 206 flips, it will drive the clamping brake pads 207 on the upper and lower surfaces to quickly close towards the brake plate 106, so that they generate a great friction force at the moment of contact with the brake plate 106, tightly clamping the brake plate 106 to one end of the saw blade 101. In this process, according to the lever principle, this linkage structure will generate a force amplification effect during the movement, so that the electric push rod 201 can convert a small pushing force into a strong clamping force of the clamping brake pads 207 on the brake plate 106, allowing it to respond automatically in case of danger, providing reliable safety protection for operators and reducing safety risks during operation.

[0029] Based on the above technical solution, the working steps of this solution are summarized as follows: When cutting wood, the first toothed disc 107 can be rotated by starting the drive motor in the lithium battery chainsaw body 1. The rotating first toothed disc 107 can drive the saw chain 105 to drive the second toothed disc 102 to rotate. During the rotation of the second toothed disc 102, the rotation speed will be detected by the Hall sensor 103 and the rotation speed signal will be transmitted to the controller.

[0030] When the saw chain 105 jams due to complex wood grain or obstruction by foreign objects, the rotation speed of the second toothed disc 102 will suddenly decrease or stop. After detecting this abnormal speed change, the Hall sensor 103 will immediately transmit the abnormal signal to the controller. Upon receiving the signal, the controller will quickly make a judgment and immediately cut off the power to the drive motor to stop its operation, preventing overload damage to the motor due to chain jamming. Simultaneously, the controller will also send a signal to the electric push rod 201 to push the piston rod. The piston rod will then push the first connecting arm 203, causing the second connecting arm 204 to rotate around the first connecting arm 203. During this process, the driven second connecting arm 204 will push the push rod 205, which is rotatably connected at the other end, from the cover 104. When the push rod 205 slides out from inside the cover 104, the third connecting arm 206, which is rotatably connected to its end, is forced to make a circular motion around the fixed fulcrum on the saw blade 101. Since the third connecting arm 206 and the push rod 205 are arranged at an obtuse angle, the linear motion of the push rod 205 is converted into a rapid flipping action of the third connecting arm 206, forming a closing effect similar to a "clamp". As the third connecting arm 206 flips, it will drive the clamping brake pads 207 on the upper and lower surfaces to quickly close towards the brake plate 106, so that they generate a great friction force at the moment of contact with the brake plate 106, tightly clamping the brake plate 106 to one end of the saw blade 101, so that it can automatically respond in case of danger, providing reliable safety protection for the operator and reducing the safety risks during the operation.

[0031] In summary: When the saw chain 105 is jammed, it can automatically respond by clamping and stopping the saw chain 105. Furthermore, by clamping the saw chain 105, it can prevent the derailed saw chain 105 from being thrown out at high speed, preventing operators from being cut or impacted by flying chain, reducing the probability of safety accidents. In complex wood cutting scenarios, it can effectively prevent the equipment from violently vibrating and losing control due to chain jamming, providing a safe working environment for operators.

[0032] All parts not described in this utility model are the same as or can be implemented using existing technology. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this utility model, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A portable lithium-ion chainsaw with an anti-jamming self-stop system, characterized in that, include: The lithium-ion chainsaw body (1) has a first toothed disc (107) fixedly installed at one end of the output shaft of the drive motor of the lithium-ion chainsaw body (1). A second toothed disc (102) is installed in an embedded manner at one end of the saw blade (101) of the lithium-ion chainsaw body (1). A saw chain (105) is fitted on the outer surface of the second toothed disc (102) and the first toothed disc (107). A brake plate (106) is fixedly installed at one end of the outer surface of the saw chain (105). The brake plate (106) can be braked by an emergency stop mechanism (2). The emergency stop mechanism (2) is fixedly installed at one end of the saw blade (101). A cover (104) is fitted on the outer surface of the emergency stop mechanism (2). The cover (104) is fixedly installed at one end of the outer surface of the lithium-ion chainsaw body (1).

2. A portable lithium-ion chainsaw with an anti-jamming self-stop system according to claim 1, characterized in that: The brake plate (106) can be driven to contact one end of the saw blade (101) as the first toothed disc (107) rotates.

3. A portable lithium-ion chainsaw with an anti-jamming self-stop system according to claim 1, characterized in that: A Hall sensor (103) is embedded at one end of the saw blade (101). The Hall sensor (103) is horizontally opposite to the second toothed disc (102). The signal transmitting end of the Hall sensor (103) is connected to the signal receiving end of the controller. The control output end of the controller is electrically connected to the power control end of the emergency stop mechanism (2) and the drive motor of the lithium battery chainsaw body (1).

4. A portable lithium-ion chainsaw with an anti-jamming self-stop system according to claim 3, characterized in that: The Hall sensor (103) and controller are model numbers AH3503 and ESP32-WROOM-32D, respectively.

5. A portable lithium-ion chainsaw with an anti-jamming self-stop system according to claim 1, characterized in that: The emergency stop mechanism (2) includes an electric push rod (201), which is rotatably mounted on one end of the outer surface of the lithium battery chainsaw body (1) and covered by a cover (104). One end of the piston rod of the electric push rod (201) is rotatably connected to a first connecting arm (203), and the other end of the first connecting arm (203) is rotatably mounted on one end of a mounting plate (202). The mounting plate (202) is fixedly mounted on one end of the saw blade (101). One end of the outer surface of the first connecting arm (203) is rotatably mounted to a second connecting arm (204), and the other end of the second connecting arm (204) is rotatably mounted to a push rod (205). The push rod (205) slides through one end of the mounting plate (202) and slides out from inside the cover (104). The electric push rod (201) is controlled by a controller.

6. A portable lithium-ion chainsaw with an anti-jamming self-stop system according to claim 5, characterized in that: One end of the push rod (205) is rotatably mounted with a third connecting arm (206), and the other end of the third connecting arm (206) is rotatably mounted with one end of the saw plate (101). Both the upper and lower surfaces of the third connecting arm (206) are fixedly mounted with brake pads (207), and the brake pads (207) are flush with the brake plate (106).

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