Control method of lithium electric nail gun

Abstract

The invention provides a control method of a lithium-ion nail gun, in a normal working state, a brushless motor of the lithium-ion nail gun continuously rotates forwards, a ratchet wheel drives a reduction gear to rotate forwards, a first limiting column and a second limiting column sequentially abut against a limiting block in the rotating process, a hammer block is continuously pushed to move backwards, and a spring is driven to be compressed; when the second limiting column is separated from the limiting block, the spring returns, the nail is ejected, and the brushless motor rotates to return to the initial position; when the lithium-ion nail gun is interrupted in work and restarted, the control method comprises the following steps: firstly trying to drive the brushless motor to rotate forwards, if the brushless motor cannot rotate forwards, reversing to rotate reversely, so that the hammer block and the firing pin slightly retreat until the hammer block and the firing pin retreat for a preset distance or retreat to an initial working position, stopping retreating, and controlling the brushless motor to rotate forwards, so that the lithium-ion nail gun recovers normal work.

Description

Technical Field

[0001] The invention relates to the control of a lithium-ion nail gun, and in particular to a brushless and sensorless nail gun and a control method thereof. Background Art

[0002] An electric nail gun (nail gun for short) is a common tool used to drive nails into wood or walls. The main components of an electric nail gun include batteries, control circuits, motors, springs, spring seats, firing pins, nail magazines, nail heads, etc.; its working process can be simply divided into three processes: loading, firing, and resetting. The firing process is as follows: when current passes through the motor, the motor starts to rotate, and the rotating motor drives the spring to pull back, and the nail and firing pin are also driven to move backward; when the firing pin reaches the preset position, the spring rebounds and drives the firing pin to move at high speed, and the firing pin head hits the end of the nail, and the impact force causes the nail to jump out of the nail magazine and fix on the work surface.

[0003] When the nail gun is in use, the battery will be exhausted before the spring compression reaches the predetermined stroke during the rotation of the motor, causing the motor to be unable to drive the spring to continue to compress and drive the nail to move backward to store energy. The spring and firing pin of the nail gun are stuck in the middle of the stroke and cannot move. At this time, the battery needs to be replaced. However, after replacing the battery, only in a few cases can the motor continue to run forward and drive the spring to continue to compress. In this case, the nail gun can continue to work normally; but in more cases, due to the energy storage of the spring and other components stuck in the middle of the stroke, the motor can be directly started to rotate forward and cannot drive the spring to continue to compress. At this time, it is necessary to disassemble the cover of the nail gun and manually return the spring to the starting position of the work. However, since the spring is in a semi-energy storage state when the nail gun is stuck, it is very likely that the nail will fly if it is started rashly, which can easily cause the operator to be injured. Therefore, a new control method is needed to overcome the operational safety problem caused by replacing the lithium battery during the above-mentioned spring energy storage process.

[0004] In addition, in the traditional market, pneumatic nail guns controlled by AC power are more common. With the development of technology, lithium-ion nail guns are becoming more and more common. However, most lithium-ion nail guns are controlled by brushed motors, and brushless motor control is relatively rare. Moreover, nail guns controlled by brushless motors are mostly brushless and sensory configurations, that is, they are equipped with Hall sensors to determine the position information of nails. However, Hall sensors are easily damaged, causing malfunctions in use, and also increase control costs. Therefore, a brushless and sensorless nail gun is needed. Summary of the invention

[0005] The present invention is to solve the safety operation problem and cost control problem of replacing the lithium battery when the lithium battery is stuck during the operation of the lithium battery nail gun and restarting and controlling the nail gun afterwards, and proposes a brushless and sensorless nail gun and a control method thereof.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A control method for a lithium-ion nail gun, characterized in that the lithium-ion nail gun comprises a lithium battery, a controller, a brushless motor, a ratchet, a reduction gear, a nail-shooting track, a spring, a hammer block, a limit block, a firing pin and a nail magazine; the lithium battery is used to power the lithium-ion nail gun, the controller is used to control the rotation of the brushless motor, the ratchet is installed on the driving shaft of the brushless motor, the ratchet is meshed with the reduction gear, and the reduction gear is provided with a first limit column and a second limit column; the spring is installed in the nail-shooting track, the hammer block is located in the nail-shooting track and is installed at one end of the spring close to the muzzle, the limit block is provided on the side of the hammer block, the front end of the hammer block is provided with a firing pin, and the nail magazine is used to supply nails; Under normal working conditions, the brushless motor continuously rotates forward, and the ratchet wheel arranged at the end of the brushless motor shaft drives the reduction gear to rotate forward. During the rotation process, the first limiting column and the second limiting column on the reduction gear successively abut against the limiting block, continuously pushing the hammer block to move backward and driving the spring to compress; when the second limiting column is out of contact with the limiting block, the spring quickly returns to its original position, pushing the hammer block and the striker at its front end to move at high speed, and the end of the striker hits the nail to eject it from the nail magazine, and the hammer block and the limiting block thereon return to the starting working position, and the reduction gear rotates to return to the initial position, and the brushless motor continuously rotates to complete the repeated nail shooting process; The controller reads the rotation direction and number of revolutions of the brushless motor, and then calculates the rotation state of the reduction gear and the displacement of the hammer block and the striker; When the lithium battery nail gun is interrupted, the control method after restarting includes the following steps: S1, restarting the lithium battery nail gun, and the controller receives a trigger signal; S2, the controller sends a control signal for forward rotation to the brushless motor; S3, detecting whether the back electromotive force of the brushless motor is read; if the back electromotive force is read, that is, the brushless motor successfully rotates forward, then go to S9; if the back electromotive force is not read, that is, the brushless motor cannot continue to rotate forward, then go to S4; S4, controlling the brushless motor to commutate by the controller, so that the brushless motor rotates in the reverse direction; S5, the brushless motor continues to rotate in the reverse direction, the maximum number of reverse rotations is set to M, and the number of reverse rotations is read; S6, judging whether the number of rotations of the brushless motor reaches the set value M; if it reaches M, go to S8; if it does not reach the set value M, go to S7; S7, judging whether the reduction gear is rotated back to the initial position, if it is rotated back to the initial position, then turning to S8; if it is not rotated to the initial position, the brushless motor fails, and the brushless motor is controlled to stop and checked by the controller; S8, controlling the brushless motor to commutate by the controller, so that the brushless motor rotates in the forward direction; S9. The brushless motor continues to rotate in the forward direction, and the lithium-ion nail gun resumes normal use.

[0007] Preferably, when the brushless motor rotates in the reverse direction M turns, the reduction gear rotates in the reverse direction 1 / 3-1 / 2 turn.

[0008] Preferably, when the brushless motor is located at an initial position, the reduction gear is located at an initial working state, and the spring returns to its original position.

[0009] Preferably, the controller is also used to monitor the current value of the brushless motor. When the current value of the brushless motor exceeds the normal working current value range, the controller controls the brushless motor to stop rotating, so that the lithium-electric nail gun stops working.

[0010] Preferably, a filtering program is provided in the controller for filtering the monitored current of the brushless motor.

[0011] Preferably, in step S8, the brushless motor can also be controlled by a controller to stop rotating, so that the lithium-electric nail gun stops working.

[0012] Preferably, a planetary gear is arranged between the brushless motor and the ratchet wheel.

[0013] Preferably, the planetary gear includes a planetary gear washer, a ring gear, and a planetary gear set. The planetary gear washer is installed at the front end of the brushless motor, the ring gear is installed at the front end periphery of the planetary gear washer, and the planetary gear set is composed of multiple pinion gears and are respectively connected to the back of the ratchet through a rotating shaft.

[0014] Preferably, the ratchet is fixedly installed via a shaft sleeve, and the reduction gear is fixedly installed via a fixed shaft.

[0015] Preferably, a shock-absorbing rubber is provided at the front end of the hammer block.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Design the existing lithium-ion nail gun into a brushless and non-inductive structure. When using a brushless motor, no Hall sensor is needed to determine the position information. Instead, the newly added controller is used to read the number of revolutions of the brushless motor. The brushless motor drives the ratchet, which meshes with the reduction gear. The two limit posts on the reduction gear cooperate with the limit blocks on the hammer block to drive the hammer block to move. The rotation of the brushless motor is positively correlated with the position of the hammer block. The displacement of the hammer block can be directly calculated by the number of revolutions of the brushless motor, thereby determining the displacement information of the nail. The advantages of brushless over brushed are: no sparks, less interference, fast response speed, high torque, no need for subsequent maintenance, and easy to use. The advantages of non-inductive over inductive are: lower control cost, and no use failure due to damage to the Hall element.

[0017] 2. A control method for lithium-ion nail guns after an interruption and restart is designed. The controller is used to control the brushless motor to execute. This method is suitable for restarting lithium-ion nail guns after they are out of power, malfunction, or after battery replacement or maintenance. Even if the spring of the nail gun is in the middle of its stroke before restarting and the nail is stuck, it can determine whether the hammer block can continue to compress the spring to complete the working stroke after restarting. If not, the motor is controlled to reverse first to reverse the stroke and then rotate forward to resume normal operation, which effectively improves the safety of lithium-ion nail guns and prevents dangerous situations such as jamming and nail explosion after the nail gun is restarted. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the lithium-electric nail gun of the present invention; Figure 2 for Figure 1 Schematic diagram of the driving and transmission mechanism of the lithium battery nail gun; Figure 3 It is a structural schematic diagram of the hammer block, the limit block and the reduction gear; Figure 4 This is an exploded diagram of the combination of brushless motor, planetary gear and ratchet; Figure 5 The present invention is a flow chart of a control method of a lithium battery nail gun.

[0020] Among them, lithium battery 1, controller 2, brushless motor 3, ratchet 4, reduction gear 5, nail shooting track 6, spring 7, hammer block 8, limit block 9, planetary gear 10, firing pin 11, nail magazine 12; first limit column 51, second limit column 52; planetary gear gasket 101, ring gear 102, planetary gear set 103. DETAILED DESCRIPTION

[0021] In order to further understand the purpose, structure, characteristics, and functions of the present invention, this section will describe specific embodiments of the present invention in detail.

[0022] In the description of the present invention, it should be noted that the terms "length", "width", "thickness", "center", "up", "down", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] In the description of the present invention, "several" means one or more, "multiple" means two or more, "greater than", "less than", "exceed" and the like are understood to exclude the number itself, and "above", "below", "within" and the like are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0024] In the description of the present invention, unless otherwise clearly defined, words such as “setting”, “installation” and “connection” should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0025] Reference below Figures 1 to 5 A control method of a lithium battery nail gun of the present invention is described in detail: like Figure 1-Figure 4As shown, the lithium-ion nail gun of the present invention comprises a lithium battery 1, a controller 2, a brushless motor 3, a ratchet 4, a reduction gear 5, a nail-shooting track 6, a spring 7, a hammer block 8, a limit block 9, a firing pin 11 and a nail magazine 12; the lithium battery 1 is used to power the lithium-ion nail gun, the controller 2 is used to control the rotation of the brushless motor 3, a ratchet 4 is mounted on the driving shaft of the brushless motor 3, the ratchet 4 is meshed with the reduction gear 5, and a first limit column 51 and a second limit column 52 are arranged on the reduction gear 5; the spring 7 is installed in the nail-shooting track 6, the hammer block 8 is located in the nail-shooting track 6 and is installed at one end of the spring 7 close to the muzzle, a limit block 9 is arranged on the side of the hammer block 8, a firing pin 11 is arranged at the front end of the hammer block 8, and the nail magazine 12 is used to supply nails.

[0026] Under normal working conditions, the brushless motor 3 continuously rotates forward, and the ratchet 4 arranged at the end of its rotating shaft drives the reduction gear 5 to rotate forward. During the rotation process, the first limit column 51 and the second limit column 52 on the reduction gear 5 successively abut against the limit block 9, continuously pushing the hammer block 8 to move backward and driving the spring 7 to compress; when the second limit column 52 is out of contact with the limit block 9, the spring 7 quickly returns to its original position, pushing the hammer block 8 and the striker 11 at its front end to move at high speed, the end of the striker 11 hits the nail to make it shoot out from the nail magazine 12, the hammer block 8 and the limit block 9 thereon return to the starting working position, and the brushless motor 3 continues to rotate to complete the repeated nail shooting process.

[0027] The controller 2 reads the rotation direction and number of revolutions of the brushless motor 3, and then calculates the rotation state of the reduction gear 5 and the displacement of the hammer block 8 and the striker 11; Compared with the existing nail gun products, the lithium-ion nail gun of the present invention has the main purpose of interrupting work. After replacing the battery or restarting after overhaul, the lithium-ion nail gun can continue to work safely and smoothly when the internal firing pin 11 is stuck in the middle position. The present invention uses a brushless motor 3, which has no sparks, less interference, fast response speed, large torque, and no subsequent maintenance compared to a brushed motor, and is easy to use; in addition, the present invention does not use a Hall sensor to determine the position information, but uses a brushless motor 3 to drive the ratchet 4, the ratchet 4 drives the reduction gear 5, and the reduction gear 5 drives the hammer block 8. A complete nail shooting process is a single cycle, and each cycle corresponds to N turns of the brushless motor 3. The displacement of the hammer block 8, that is, the position of the firing pin 11, is calculated by reading the number of turns of the brushless motor 3; when the nail is fired, the spring 7 and the hammer block 8 return to their respective initial positions, waiting for the next nail shooting cycle. No Hall sensor is used, that is, no induction, which is lower in cost than inductive control, and will not cause use failures due to damage to the Hall components.

[0028] like Figure 5 As shown, the control method of the lithium-ion nail gun of the present invention, when the lithium-ion nail gun is interrupted due to power exhaustion, replacing a new battery or restarting the work after charging comprises the following steps: S1, restarting the lithium battery nail gun, the controller 2 receives a trigger signal; restarting the nail gun is usually achieved by pressing the trigger of the lithium battery nail gun; S2, the controller 2 sends a control signal for the brushless motor 3 to rotate forward, and tries whether the lithium battery nail gun can directly drive the hammer block 8 to continue to move backward and continue to compress the spring 7 after restarting, thereby continuing the energy storage process that was interrupted due to the interruption of work; S3, detecting whether the back electromotive force of the brushless motor 3 is read; if the back electromotive force is read, that is, the brushless motor 3 successfully rotates forward, then go to S9; if the back electromotive force is not read, that is, the brushless motor 3 cannot continue to rotate forward, then go to S4; Under normal working conditions, once the brushless motor 3 starts to rotate, the back electromotive force can be read. Therefore, the present invention determines whether the brushless motor 3 is rotating by reading the back electromotive force. If the back electromotive force is detected, it proves that the brushless motor 3 is rotating in the forward direction, and can directly drive the interrupted hammer block 8 to move the compression spring 7 backward, so that the nail continues to move backward and then accumulates energy. If the back electromotive force cannot be read, it means that the brushless motor 3 has no way to overcome the resistance caused by the work interruption and work normally directly, and other measures need to be taken.

[0029] S4, controlling the brushless motor 3 to change phase through the controller 2, so that the brushless motor 3 rotates in the reverse direction; The brushless motor 3 rotates in the reverse direction, driving the ratchet 4 and the reduction gear 5 to rotate in the reverse direction, so that the hammer block 8 moves forward and the spring 7 stretches; when the spring 7 has stored energy, the reverse rotation of the brushless motor 3 will surely succeed; S5, the brushless motor 3 continues to rotate in the reverse direction, the maximum value of the reverse rotation number is set to M, and the reverse rotation number is read; the purpose of this step is to make the hammer block 8 and the striker 11 continuously move backward, and setting the maximum value of the reverse rotation number to M is to limit the maximum moving backward distance, and reading the reverse rotation number is used to calculate the actual moving backward distance of the hammer block 8, so as to realize accurate position information reading.

[0030] S6, judging whether the number of rotations of the brushless motor 3 reaches the set value M; if it reaches M, go to S8; if it does not reach the set value M, go to S7; S7, judging whether the brushless motor 3 rotates back to the initial position, if it rotates back to the initial position, then go to S8; if it does not rotate to the initial position, the brushless motor 3 fails, and the controller 2 controls the brushless motor 3 to stop and check; In some embodiments, when the brushless motor 3 is in the initial position, the reduction gear 5 is in the initial working state, the spring 7 returns to its position, and the lithium-ion nail gun as a whole is in the initial working state. Preferably, a complete circle of forward rotation of the reduction gear 5 corresponds to a complete nail shooting process, and continuous forward rotation of the reduction gear 5 means that the lithium-ion nail gun continues to shoot nails.

[0031] S8, controlling the brushless motor 3 to change phase through the controller 2, so that the brushless motor 3 rotates in the forward direction; S9, the brushless motor 3 continues to rotate in the forward direction, and the lithium-ion nail gun resumes normal use.

[0032] The control method of the present invention is aimed at the situation where the lithium-ion nail gun is interrupted and restarted. The reasons for the interruption include insufficient battery power, failure, etc. After replacing the battery or overhauling, the lithium-ion nail gun is restarted. At this time, the controller 2 controls the program inside it to start, and first tries to drive the brushless motor 3 to rotate forward. If the brushless motor 3 cannot rotate forward, the brushless motor 3 is driven to change phases and rotate. The brushless motor 3 rotates in the reverse direction to make the hammer block 8 and the striker 11 retreat. The retreat distance depends on the number of revolutions of the brushless motor 3. There are two situations for the brushless motor 3 to retreat: one is when the brushless motor 3 reverses M revolutions, that is, the hammer block 8 and the striker 11 have retreated the set maximum distance , at this time, the hammer block 8 and the nail are still in the firing stroke, and then the brushless motor 3 is driven to change phase and rotate forward, so that the hammer block 8 and the firing pin 11 continue to move forward; in this case, it is equivalent to first retreating a nail that is stuck in the middle of the nail shooting stroke and cannot continue to move for a distance and then "rushing through", thereby restoring the normal operation of the lithium-ion nail gun; the second is that when the brushless motor 3 reverses less than M circles, it has returned to the initial position, that is, the hammer block 8 and the firing pin 11 have returned to the initial working state. In this state, it is equivalent to safely retreating the lithium-ion nail gun to the initial state. At this time, whether it is stopping the nail shooting or making the brushless motor 3 rotate forward and work again, it can operate normally. The control method of the present invention can effectively avoid stalling, uncontrolled ejection of nails, etc. after the lithium-ion nail gun is interrupted and restarted, and it is safer.

[0033] In some embodiments, when the brushless motor 3 rotates in the reverse direction M times, the reduction gear 5 rotates in the reverse direction 1 / 3-1 / 2 times, where M is a natural number and M≥1. The number of times the brushless motor 3 rotates in the reverse direction is positively correlated with the number of times the reduction gear 5 rotates in the reverse direction and the distance the hammer block 8 moves backward. Usually, the reduction gear 5 is controlled to rotate in the reverse direction no more than 1 / 2 times, and 1 / 3-1 / 2 times is better.

[0034] In some embodiments, the controller 2 is also used to monitor the current value of the brushless motor 3. When the current value of the brushless motor 3 exceeds the normal working current value range, the controller 2 controls the brushless motor 3 to stop rotating, so that the lithium-electric nail gun stops working. This operation is the second restriction for the lithium-electric nail gun. If the detected current exceeds the maximum value within the normal range, it means that the lithium-electric nail gun is very likely to fail. At this time, the controller 2 controls the brushless motor 3 to stop rotating, so that the lithium-electric nail gun stops working, which is a better protection measure to avoid more dangers.

[0035] In some embodiments, the controller 2 is provided with a filtering program for filtering the monitored current of the brushless motor 3. Filtering the current can effectively remove the current waveform burrs, thereby avoiding false shutdowns due to detection errors and improving the accuracy of the safety protection program activation.

[0036] In some embodiments, in step S8, the controller 2 can also be used to control the brushless motor 3 to stop rotating, so that the lithium-electric nail gun stops working, that is, the brushless motor 3 reverses to control the hammer block 8 and the firing pin 11 to return to the initial working state, and the spring 7 has no energy storage. At this time, shutdown is also the normal state of the lithium-electric nail gun, and there is no operational risk. If the user no longer needs to shoot nails and only wants to eliminate safety hazards, this operation can be selected.

[0037] In some embodiments, a planetary gear 10 is arranged between the brushless motor 3 and the ratchet 4. Preferably, the planetary gear 10 includes a planetary gear washer 101, a ring gear 102, and a planetary gear set 103. The planetary gear washer 101 is installed at the front end of the brushless motor 3. A motor washer can be arranged between the planetary gear washer 101 and the brushless motor 3. The ring gear 102 is installed at the front end periphery of the planetary gear washer 101. The planetary gear set 103 is composed of a plurality of pinions and is respectively arranged on the back of the ratchet 4 through a rotating shaft. The planetary gear 10 is arranged in front of the brushless motor 3, which can effectively improve the output torque of the motor, reduce the inertia of the transmission system, increase the working stability, and improve the transmission efficiency. Its high precision, high rigidity, and long service life can minimize the errors caused by the transmission process while ensuring the stability of the system. The number of springs 7 in the nail gun is large, and the energy storage is large. If an accident occurs, the structure of the motor and the planetary gear 10 can play a good role in resisting.

[0038] In some embodiments, the ratchet 4 is fixedly installed via a bushing, and the reduction gear 5 is fixedly installed via a fixed shaft, thereby increasing the stability and accuracy of the drive and transmission system.

[0039] In some embodiments, the front end of the hammer block 8 is provided with shock-absorbing rubber to enhance the safety and comfort when using the lithium-electric nail gun.

[0040] The lithium-ion nail gun of the present invention, except for the structures highlighted in the above embodiments, has other parts referring to the common nail gun structures on the market, such as the nail magazine 12, the trigger mechanism including the trigger and the transmission rod, etc.

[0041] The lithium-ion nail gun of the present invention is a brushless and sensorless nail gun, which solves the inconvenience of wired operation of traditional pneumatic nail guns. Compared with brushed lithium-ion nail guns, it requires almost no subsequent maintenance and can also achieve relatively large torque. Moreover, since the cost of brushless and sensorless is more advantageous than brushless and sensory, it is more acceptable to customers. The lithium-ion nail gun control method of the present invention is based on the controller and drive transmission structure in the lithium-ion nail gun. After the lithium-ion nail gun is interrupted and restarted, it can effectively avoid stalling, uncontrolled ejection of nails, etc., so that it can work smoothly again with higher safety.

[0042] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0043] The present invention has been described by the above-mentioned relevant embodiments, but the above-mentioned embodiments are only examples for implementing the present invention, which are used to help understand the technical solutions and core ideas of the present application. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention; on the contrary, the technical solutions recorded in the above-mentioned embodiments can still be modified, or some of the technical features therein can be replaced by equivalents; modifications and embellishments made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A control method for a lithium battery nail gun, characterized in that: The lithium-ion nail gun comprises a lithium battery, a controller, a brushless motor, a ratchet, a reduction gear, a nail-shooting track, a spring, a hammer block, a limit block, a firing pin and a nail magazine; the lithium battery is used to power the lithium-ion nail gun, the controller is used to control the rotation of the brushless motor, the ratchet is mounted on the driving shaft of the brushless motor, the ratchet is meshed with the reduction gear, and the reduction gear is provided with a first limit column and a second limit column; the spring is installed in the nail-shooting track, the hammer block is located in the nail-shooting track and is installed at one end of the spring close to the muzzle, the limit block is provided on the side of the hammer block, the front end of the hammer block is provided with a firing pin, and the nail magazine is used to supply nails; Under normal working conditions, the brushless motor continuously rotates forward, and the ratchet wheel arranged at the end of the brushless motor shaft drives the reduction gear to rotate forward. During the rotation process, the first limiting column and the second limiting column on the reduction gear successively abut against the limiting block, continuously pushing the hammer block to move backward and driving the spring to compress; when the second limiting column is out of contact with the limiting block, the spring quickly returns to its original position, pushing the hammer block and the striker at its front end to move at high speed, and the end of the striker hits the nail to eject it from the nail magazine, and the hammer block and the limiting block thereon return to the starting working position, and the reduction gear rotates to return to the initial position, and the brushless motor continuously rotates to complete the repeated nail shooting process; The controller reads the rotation direction and number of revolutions of the brushless motor, and then calculates the rotation state of the reduction gear and the displacement of the hammer block and the striker; When the lithium battery nail gun is interrupted, the control method after restarting includes the following steps: S1, restarting the lithium battery nail gun, and the controller receives a trigger signal; S2, the controller sends a control signal for forward rotation to the brushless motor; S3, detecting whether the back electromotive force of the brushless motor is read; if the back electromotive force is read, that is, the brushless motor successfully rotates forward, then go to S9; if the back electromotive force is not read, that is, the brushless motor cannot continue to rotate forward, then go to S4; S4, controlling the brushless motor to commutate by the controller, so that the brushless motor rotates in the reverse direction; S5, the brushless motor continues to rotate in the reverse direction, the maximum number of reverse rotations is set to M, and the number of reverse rotations is read; S6, judging whether the number of rotations of the brushless motor reaches the set value M; if it reaches M, go to S8; if it does not reach the set value M, go to S7; S7, judging whether the reduction gear is rotated back to the initial position, if it is rotated back to the initial position, then turning to S8; if it is not rotated to the initial position, the brushless motor fails, and the brushless motor is controlled to stop and checked by the controller; S8, controlling the brushless motor to commutate by the controller, so that the brushless motor rotates in the forward direction; S9. The brushless motor continues to rotate in the forward direction, and the lithium-ion nail gun resumes normal use.

2. The control method of the lithium battery nail gun according to claim 1, characterized in that: When the brushless motor rotates in the reverse direction M turns, the reduction gear rotates in the reverse direction 1 / 3-1 / 2 turn.

3. The control method of the lithium battery nail gun according to claim 1, characterized in that: When the brushless motor is located at the initial position, the reduction gear is located at the initial working state, and the spring returns to its original position.

4. The control method of the lithium battery nail gun according to claim 1, characterized in that: The controller is also used to monitor the current value of the brushless motor. When the current value of the brushless motor exceeds the normal working current value range, the controller controls the brushless motor to stop rotating, so that the lithium-electric nail gun stops working.

5. The control method of the lithium battery nail gun according to claim 4, characterized in that: The controller is provided with a filtering program for filtering the monitored brushless motor current.

6. The control method of the lithium battery nail gun according to claim 1, characterized in that: In step S8, the brushless motor can also be controlled by the controller to stop rotating, so that the lithium-powered nail gun stops working.

7. The control method of the lithium battery nail gun according to claim 1, characterized in that: A planetary gear is arranged between the brushless motor and the ratchet wheel.

8. The control method of the lithium battery nail gun according to claim 7, characterized in that: The planetary gear includes a planetary gear washer, a gear ring, and a planetary gear set. The planetary gear washer is installed at the front end of the brushless motor, the gear ring is installed at the front end periphery of the planetary gear washer, and the planetary gear set is composed of a plurality of pinions and are respectively connected to the back of the ratchet through a rotating shaft.

9. The control method of the lithium battery nail gun according to claim 1, characterized in that: The ratchet is fixedly installed via a shaft sleeve, and the reduction gear is fixedly installed via a fixed shaft.

10. The control method of the lithium battery nail gun according to claim 1, characterized in that: The front end of the hammer block is provided with a shock absorbing rubber.

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