A power tool

Abstract

The application provides an electric tool, which comprises a shell, a first rotating shaft, a driving assembly and a stop assembly. The shell is internally provided with a containing chamber. The first rotating shaft penetrates the shell, and a saw blade is installed at one end of the first rotating shaft away from the shell. The driving assembly is arranged in the containing chamber to drive the first rotating shaft to rotate. The stop assembly is arranged on one side of the first rotating shaft and comprises a first stop portion and a second stop portion. The first stop portion is used for cooperating with the first rotating shaft to limit the rotation of the first rotating shaft. The second stop portion is arranged on one side of the first stop portion to limit the first stop portion from approaching the first rotating shaft. When the electric tool is in a replaceable state, the second stop portion releases the limitation on the first stop portion. The application solves the technical problem that the user is prone to mistakenly touching the main shaft locking button, which causes the rotating shaft to stop rotating in unnecessary scenarios and causes use risks.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cutting tools, in particular to an electric tool. BACKGROUND

[0002] As a handheld or table electric cutting tool, the electric tool has been widely applied in straight or inclined cutting processing of wood, metal, concrete, ceramic tile and other materials. With the continuous improvement of user demand for cutting efficiency, precision and multi-material adaptation, the saw blade specifications and tooth shape types are increasingly rich, and the frequency of replacing the saw blade is greatly increased. The traditional electric tool usually adopts a simple mechanical spindle locking button to lock the rotating shaft connected with the saw blade, so as to replace the saw blade.

[0003] However, at least one of the following problems exists in the related art: the user is easy to mispress the spindle locking button, which causes the rotating shaft to stop rotating in unnecessary scenarios, resulting in use risk. SUMMARY

[0004] The technical problem solved by the present application is that the user is easy to mispress the spindle locking button, which causes the rotating shaft to stop rotating in unnecessary scenarios, resulting in use risk.

[0005] To solve the above problems, the present application provides an electric tool, which comprises: a shell, a first rotating shaft, a driving assembly, and a stop assembly. The shell is provided with a containing chamber. The first rotating shaft penetrates the shell, and a saw blade is installed at the end of the first rotating shaft away from the shell. The driving assembly is arranged in the containing chamber to drive the first rotating shaft to rotate. The stop assembly is arranged on one side of the first rotating shaft and comprises a first stop portion and a second stop portion. The first stop portion is used to cooperate with the first rotating shaft to limit the rotation of the first rotating shaft. The second stop portion is arranged on one side of the first stop portion to limit the first stop portion from approaching the first rotating shaft. When the electric tool is in a replaceable state, the second stop portion releases the limitation on the first stop portion.

[0006] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: the first stop portion is responsible for actually locking the first rotating shaft, and the second stop portion physically blocks the action of the first stop portion in a non-replaceable state, which ensures that the spindle locking button is only allowed to be pressed when it is completely safe, thereby increasing the safety of the electric tool.

[0007] In an example of the present application, a limiting ring fixedly connected with the first rotating shaft is sleeved on the first rotating shaft. A plurality of limiting protrusions are arranged on the outer circumferential side of the limiting ring, and a first limiting groove is formed between every two limiting protrusions. When the first stop portion cooperates with the first limiting groove, the limiting protrusions abut against the first stop portion to limit the rotation of the limiting ring.

[0008] Compared with the prior art, the technical effects achieved by adopting the technical scheme are that: by arranging the limiting ring with multiple limiting grooves on the rotating shaft, the locking angle range is significantly increased, the difficulty and time of finding the gap are greatly reduced, and automatic and accurate alignment can be realized by cooperating with the subsequent sensor.

[0009] In one example of the present application, the second limiting groove is arranged on the outside of the shell, and the first stop portion includes: a pressing cap arranged in the second limiting groove; a first limiting rod arranged through the bottom plate forming the second limiting groove, one end of the first limiting rod being fixedly connected with the pressing cap, and the other end of the first limiting rod being used for cooperating with the first limiting groove to limit the rotation of the limiting ring; and a reset spring sleeved on the first limiting rod, one end of the reset spring being connected with the pressing cap, and the other end of the reset spring being connected with the bottom plate, so that the pressing cap is subjected to a force in a direction away from the first rotating shaft.

[0010] Compared with the prior art, the technical effects achieved by adopting the technical scheme are that: by adopting the spring-reset pressing cap type first stop portion, the structure is simple and reliable, the cost is low, the operation conforms to the user's habit, the pressing feeling is clear, and the reset spring ensures that the locking pin automatically exits in the non-pressing state without locking the rotating shaft.

[0011] In one example of the present application, the second stop portion includes: a control console arranged in the accommodating chamber; a second limiting rod, one end of the second limiting rod being connected with the control console, and the other end of the second limiting rod being abutted with the pressing cap to limit the pressing cap from moving towards the first rotating shaft; and a first sensor connected with the control console, the first sensor being used for detecting the relative position of the limiting ring and the first limiting rod; wherein, when the first limiting groove on the limiting ring is directly opposite to the first limiting rod, the electric tool enters the replaceable state, and the second limiting rod moves away from the pressing cap.

[0012] Compared with the prior art, the technical effects achieved by adopting the technical scheme are that: by introducing the sensor to detect whether the first limiting groove is accurately aligned with the first limiting rod in real time, the second stop portion can be driven to be unblocked only when the groove is completely opposite, and the first limiting rod can be directly inserted into the first limiting groove after the second stop portion is unlocked.

[0013] In one example of the present application, the first stop portion further includes: a swing rod, one end of the swing rod being rotatably connected to the first side plate forming the second limiting groove, and the other end of the swing rod being provided with a sliding protrusion; a second side plate is arranged on the side of the pressing cap close to the first side plate, and a sliding groove is arranged on the second side plate, the sliding groove being configured as a closed heart-shaped groove; wherein, the sliding protrusion is slidably matched with the sliding groove, and when the first limiting rod moves towards the first rotating shaft, the sliding protrusion moves to the upper part of the sliding groove, so that the first stop portion is automatically locked.

[0014] Compared with the prior art, the technical effects reached by adopting the technical scheme are that: by increasing the heart-shaped groove pressing self-locking mechanism, the user can keep the locking action without pressing the pressing cap all the time, and the film changing convenience and ergonomics are greatly improved.

[0015] In an example of the present application, the first limiting rod is provided with a third limiting groove, and the bottom plate is provided with an anti-falling ring matched with the third limiting groove on the side close to the first rotating shaft; when the first limiting rod moves away from the first rotating shaft, the anti-falling ring abuts against the bottom plate.

[0016] Compared with the prior art, the technical effects reached by adopting the technical scheme are that: by matching the third limiting groove with the anti-falling ring, the first limiting rod is prevented from being completely ejected and falling off under the action of the spring force, and the locking pin assembly is still complete and reliable after long-term use.

[0017] In an example of the present application, the second side plate is provided with a guide groove arranged along the movement direction of the first limiting rod, and the first side plate is provided with a guide rail matched with the guide groove to limit the movement track of the pressing cap.

[0018] Compared with the prior art, the technical effects reached by adopting the technical scheme are that: by arranging the guide groove and the guide rail, it is ensured that the pressing cap can only move in the axial direction accurately and linearly, and the deflection and jamming phenomenon is completely eliminated, and the smoothness and durability of the action are further improved.

[0019] In an example of the present application, the driving assembly comprises: a driving motor arranged in the accommodating chamber, and the driving motor is provided with a first motor shaft at one end; the first motor shaft is provided with a first transmission gear, and the first rotating shaft is provided with a second transmission gear matched with the first transmission gear to drive the first rotating shaft to rotate.

[0020] Compared with the prior art, the technical effects reached by adopting the technical scheme are that: by the first motor shaft on the driving motor, the first rotating shaft can be driven to rotate, which is convenient for industrial production.

[0021] In an example of the present application, the electric tool adopts a rotating shaft positioning method, which comprises: controlling the second stop portion to lock the first limiting rod, and detecting whether the electric tool is in a working state in real time; if not, controlling the first sensor to collect position information of the limiting ring, and judging whether the electric tool is in a replaceable state according to the position information; if yes, controlling the second stop portion to lock the first limiting rod; controlling the first limiting rod to lock the limiting ring to limit the rotation of the first rotating shaft, and replacing the saw blade at the end of the first rotating shaft.

[0022] In one example of the present application, the position information of the limiting ring is controlled to be collected by the first sensor, and whether the power tool is in the replaceable state is judged according to the position information, including: controlling the first sensor to obtain a first relative distance from the end of the first limiting rod to the outer surface of the limiting ring directly below the first limiting rod, judging whether the first relative distance conforms to a first preset length; if yes, controlling the first sensor to detect a second relative distance and a third relative distance from the end of the first limiting rod to the limiting protrusions located on both sides of the first limiting rod, judging whether the difference between the second relative distance and the third relative distance is less than a second preset length; if yes, it is determined that the power tool is in the replaceable state.

[0023] Compared with the prior art, the technical effects achieved by adopting the technical scheme are as follows: the technical effects corresponding to any of the technical schemes in the above embodiments can be achieved, which will not be described here.

[0024] After adopting the technical scheme of the present application, the following technical effects can be achieved:

[0025] (1) The first stop portion is responsible for actually locking the first rotating shaft, and the second stop portion physically blocks the action of the first stop portion in the non-replaceable state, so that only when it is completely safe can the lock shaft button be pressed, thereby increasing the safety of the power tool in use;

[0026] (2) The sensor is introduced to detect whether the first limiting groove is accurately aligned with the first limiting rod in real time, so that only when the groove is completely aligned can the second stop portion be driven to remove the block, thereby ensuring that after the second stop portion is unlocked, the first limiting rod can be directly inserted into the first limiting groove;

[0027] (3) The heart-shaped groove is added to press the self-locking mechanism, so that the user does not have to hold the pressing cap all the time to maintain the locking action, thereby greatly improving the convenience and ergonomics of changing the blade. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings to be used in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings;

[0029] Figure 1 A structure diagram of a power tool provided by the embodiment of the present application Figure One ;

[0030] Figure 2 A structure diagram of a power tool provided by the embodiment of the present application Figure Two ;

[0031] Figure 3 For Figure 2A-A direction;

[0032] Figure 4 For Figure 3 A partial schematic view of the I part;

[0033] Figure 5 For the structure of an electric tool provided by the embodiment of the application Figure Three ;

[0034] Figure 6 For Figure 5 A partial schematic view of the II part;

[0035] Figure 7 For the structure of an electric tool provided by the embodiment of the application Figure Four ;

[0036] Figure 8 The flowchart of the shaft positioning method for the electric tool provided by the embodiment of the application.

[0037] Explanation of reference signs:

[0038] 1, electric tool; 10, shell; 11, containing chamber; 12, second limiting groove; 13, bottom plate; 14, first side plate; 141, guide rail; 15, limiting plate; 151, limiting hole; 20, first rotating shaft; 21, saw blade; 22, limiting ring; 221, limiting protrusion; 222, first limiting groove; 23, second transmission gear; 30, driving assembly; 31, driving motor; 311, first motor shaft; 312, first transmission gear; 40, first stop; 41, pressing cap; 411, second side plate; 412, sliding groove; 413, guide groove; 42, first limiting rod; 421, third limiting groove; 43, return spring; 44, swing rod; 45, anti-dropping ring; 50, second stop; 51, control console; 52, second limiting rod; 53, first sensor. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned purposes, features and advantages of the application more obvious and easy to understand, the specific embodiments of the application will be described in detail below with reference to the drawings.

[0040] Reference Figures 1 to 7 , which is a structural schematic view of an electric tool 1 provided by the embodiment of the application.

[0041] The application provides an electric tool 1, which comprises a shell 10, a first rotating shaft 20, a driving assembly 30 and a locking assembly. The shell 10 is internally provided with a receiving cavity 11; the first rotating shaft 20 penetrates through the shell 10, and a saw blade 21 is mounted on the end of the first rotating shaft 20 away from the shell 10; the driving assembly 30 is arranged in the receiving cavity 11 to drive the first rotating shaft 20 to rotate; and the locking assembly is arranged on one side of the first rotating shaft 20.

[0042] Specifically, the electric tool 1 is a handheld electric tool 1, the shell 10 comprises a handheld part and a head part, the receiving cavity 11 is arranged on the head part, and one end of the first rotating shaft 20 extends out of the receiving cavity 11 to be used for mounting the saw blade 21.

[0043] Preferably, part of the locking assembly is arranged in the receiving cavity 11, and correspondingly, part of the first rotating shaft 20 is arranged in the receiving cavity 11 to be locked with the part of the locking assembly arranged in the receiving cavity 11.

[0044] The locking assembly comprises a first locking part 40 and a second locking part 50. The first locking part 40 is used for cooperating with the first rotating shaft 20 to limit the rotation of the first rotating shaft 20; the second locking part 50 is arranged on one side of the first locking part 40 to limit the first locking part 40 from approaching the first rotating shaft 20; and when the electric tool 1 is in a replaceable state, the second locking part 50 releases the limitation on the first locking part 40.

[0045] For example, the trigger form of the first locking part 40 includes but is not limited to a push trigger, a pull trigger or a twist trigger; and the cooperation form of the first locking part 40 and the first rotating shaft 20 includes but is not limited to an insertion cooperation of a limiting column and a limiting groove or a ratchet engagement and other forms of limiting the rotation of the first rotating shaft 20.

[0046] Specifically, generally, the first locking part 40 is limited by the second locking part 50, so that the first locking part 40 cannot cooperate with the first rotating shaft 20, and when the electric tool 1 is in a replaceable state, a signal lamp on the electric tool 1 is lighted, and the first locking part 40 can be triggered by a user, that is, the first locking part 40 is triggered to cooperate with the first rotating shaft 20 to limit the rotation of the first rotating shaft 20.

[0047] Preferably, the second locking part 50 cannot affect the rotation of the first rotating shaft 20, and when the first locking part 40 is not triggered, the second locking part 50 also cannot affect the rotation of the first rotating shaft 20.

[0048] The first locking part 40 is responsible for actually locking the first rotating shaft 20, and the second locking part 50 physically blocks the first locking part 40 from acting in a non-replaceable state, so that the locking shaft button is allowed to be pressed only when it is completely safe, thereby increasing the safety of the electric tool 1.

[0049] Further, the first rotating shaft 20 is sleeved with a limiting ring 22 fixedly connected with the first rotating shaft 20, and a plurality of limiting protrusions 221 are arranged on the outer circumferential side of the limiting ring 22, and a first limiting groove 222 is formed between every two limiting protrusions 221; when the first stop portion 40 cooperates with the first limiting groove 222, the limiting protrusions 221 abut against the first stop portion 40 to limit the rotation of the limiting ring 22.

[0050] By arranging the limiting ring 22 with a plurality of first limiting grooves 222 on the rotating shaft, the locking angle range is significantly increased, the difficulty and time of finding the gap are greatly reduced, and automatic and accurate alignment can be realized by cooperating with the subsequent sensor.

[0051] Preferably, the first limiting groove 222 and the limiting protrusion 221 are five respectively and are uniformly distributed on the circumferential side of the limiting ring 22.

[0052] Preferably, the limiting ring 22 and the first rotating shaft 20 are mutually locked, and when any one rotates, the other one is correspondingly driven to rotate.

[0053] Further, the second limiting groove 12 is arranged on the outer side of the shell 10, and the first stop portion 40 comprises a pressing cap 41, a first limiting rod 42 and a reset spring 43. The pressing cap 41 is arranged on the second limiting groove 12; the first limiting rod 42 is arranged through the bottom plate 13 forming the second limiting groove 12, one end of the first limiting rod 42 is fixedly connected with the pressing cap 41, and the other end of the first limiting rod 42 is used for cooperating with the first limiting groove 222 to limit the rotation of the limiting ring 22; the reset spring 43 is sleeved on the first limiting rod 42, one end of the reset spring 43 is connected with the pressing cap 41, and the other end of the reset spring 43 is connected with the bottom plate 13, so that the pressing cap 41 is subjected to a force in a direction away from the first rotating shaft 20.

[0054] Specifically, the pressing cap 41 is provided with anti-skid lines, when the signal light is lighted, the user applies pressure to the pressing cap 41, and the end of the first limiting rod 42 is pushed into the first limiting groove 222, so as to rotate and lock the first rotating shaft 20.

[0055] Preferably, the end of the first limiting rod 42 is provided with an anti-skid groove, and the pressing cap 41 is formed with the end of the first limiting rod 42 by injection molding, so as to prevent the pressing cap 41 and the first limiting rod 42 from being separated from each other.

[0056] By adopting the spring reset pressing cap 41 type first stop portion 40, the structure is simple and reliable, the cost is low, the operation conforms to the user's habit, the pressing feeling is clear, the reset spring 43 ensures that the locking pin automatically exits in the non-pressing state, and the rotating shaft is not mistaken.

[0057] Further, the second stop portion 50 comprises a control console 51, a second limiting rod 52 and a first sensor 53. The control console 51 is arranged in the accommodating chamber 11; one end of the second limiting rod 52 is connected with the control console 51, and the other end of the second limiting rod 52 abuts against the pressing cap 41 to limit the approach of the pressing cap 41 to the first rotating shaft 20; the first sensor 53 is connected with the control console 51, and is used to detect the relative position of the limiting ring 22 and the first limiting rod 42; wherein, when the first limiting groove 222 on the limiting ring 22 is directly opposite to the first limiting rod 42, the electric tool 1 enters the replaceable state, and the second limiting rod 52 moves away from the pressing cap 41.

[0058] Specifically, in use, when the saw blade 21 is controlled to rotate slowly by hand or mechanical transmission, the first sensor 53 is used to detect whether the first limiting groove 222 is directly below the first limiting rod 42 in real time, and when the two are aligned, the signal light is turned on, and the user can press the pressing cap 41.

[0059] Preferably, the bottom plate 13 further comprises a limiting plate 15 arranged on the side away from the pressing cap 41, and the limiting plate 15 is provided with a limiting hole 151 for the first limiting rod 42 to pass through, so as to ensure the movement track of the first limiting rod 42, and when the first limiting rod 42 cooperates with the first limiting groove 222, the limiting rod can further increase the stability of the first stop portion 40, and ensure that the first limiting rod 42 will not be deviated by the limiting protrusion 221 on the limiting ring 22.

[0060] Preferably, the first sensor 53 and the control console 51 are arranged on the side of the limiting plate 15 close to the bottom plate 13, the first sensor 53 penetrates the limiting plate 15 to detect the limiting ring 22, and the second limiting rod 52 penetrates the bottom plate 13 to abut against the bottom end of the pressing cap 41.

[0061] By introducing the sensor to detect whether the first limiting groove 222 is accurately aligned with the first limiting rod 42 in real time, only when the groove is completely opposite can the second stop portion 50 be driven to be unblocked, and after the second stop portion 50 is unlocked, the first limiting rod 42 can be directly inserted into the first limiting groove 222.

[0062] Further, the first stop portion 40 further comprises a swing rod 44, one end of the swing rod 44 is rotationally connected to the first side plate 14 forming the second limiting groove 12, and the other end of the swing rod 44 is provided with a sliding protrusion; the side of the pressing cap 41 close to the first side plate 14 is provided with a second side plate 411, and the second side plate 411 is provided with a sliding groove 412 configured as a closed heart-shaped groove; wherein, the sliding protrusion is in sliding cooperation with the sliding groove 412, and when the first limiting rod 42 moves in the direction close to the first rotating shaft 20, the sliding protrusion moves to the upper part of the sliding groove 412, so as to automatically lock the first stop portion 40.

[0063] When the pressing cap 41 moves downward under the action of external force, the sliding protrusion moves down along the vertical section of the heart-shaped groove, causing the swing rod 44 to swing around the pivot, so that it is released from the locked position of the first limit groove 222, thereby unlocking the first stop part 40; at this time, the first limit rod 42 can retract freely, and with the status feedback signal of the second stop part 50, it ensures that the entire mechanism completes the reset action under safe conditions.

[0064] By adding a heart-shaped groove press-lock mechanism, users can maintain the locked action without having to hold down the press cap 41, greatly improving the convenience and ergonomics of changing pads.

[0065] Furthermore, the first limiting rod 42 is provided with a third limiting groove 421, and the bottom plate 13 is provided with an anti-detachment ring 45 that cooperates with the third limiting groove 421 on the side near the first rotating shaft 20; wherein, when the first limiting rod 42 moves away from the first rotating shaft 20, the anti-detachment ring 45 abuts against the bottom plate 13.

[0066] Preferably, the anti-detachment ring 45 has a notch and is configured as a C-shape. The first limiting rod 42 is installed from the notch of the anti-detachment ring 45, and the inner diameter of the anti-detachment ring 45 is larger than the third limiting groove 421 and smaller than the limiting rod, so that the anti-detachment ring 45 can be installed to the first limiting rod 42.

[0067] The third limiting groove 421 cooperates with the anti-detachment ring 45 to prevent the first limiting rod 42 from completely popping out and falling off under the action of spring force, ensuring that the locking pin assembly remains intact and reliable after long-term use.

[0068] Furthermore, the second side plate 411 is provided with a guide groove 413, which is arranged along the direction of movement of the first limiting rod 42; the first side plate 14 is provided with a guide rail 141 that cooperates with the guide groove 413 to limit the movement trajectory of the pressing cap 41.

[0069] By setting the guide groove 413 and the guide rail 141, it is ensured that the pressing cap 41 can only move in a precise straight line along the axial direction, completely eliminating the phenomenon of skewness and jamming, and further improving the smoothness and durability of the action.

[0070] Furthermore, the drive assembly 30 includes a drive motor 31, which is disposed within the receiving chamber 11. One end of the drive motor 31 has a first motor shaft 311. A first transmission gear 312 is provided on the first motor shaft 311, and a second transmission gear 23 that cooperates with the first transmission gear 312 is provided on the first rotating shaft 20 to drive the first rotating shaft 20 to rotate. The first rotating shaft 20 can be driven to rotate by the first motor shaft 311 on the drive motor 31, which is convenient for industrial production.

[0071] On the other hand, in actual application, the electric tool 1 adopts a rotating shaft positioning method to realize the locking of the first rotating shaft 20 when replacing the saw blade 21, referring to Figure 8 which is a flowchart of the rotating shaft positioning method adopted by the electric tool 1 provided by the embodiment of the present application.

[0072] The rotating shaft positioning method comprises:

[0073] Step S1: control the second stop part to lock the first limiting rod, and detect whether the electric tool is in a working state in real time;

[0074] When the electric tool is powered on for use, the user is easy to cause an accident by accidentally pressing the press cap, so it is necessary to confirm that the electric tool is not in a working state before replacing the blade.

[0075] Step S2: if not, control the first sensor to collect the position information of the limiting ring, and determine whether the electric tool is in a replaceable state according to the position information;

[0076] Step S3: if yes, control the second stop part to lock the first limiting rod;

[0077] Step S4: control the first limiting rod to lock the limiting ring, and replace the saw blade at the end of the first rotating shaft.

[0078] Further, step S2 comprises:

[0079] Step S21: control the first sensor to obtain a first relative distance from the end of the first limiting rod to the outer surface of the limiting ring directly below the first limiting rod, and determine whether the first relative distance meets a first preset length;

[0080] The bottom wall of the first limiting groove 222 and the bottom wall of the limiting protrusion 221 are different in height from the first limiting rod 42, and by judging the value of the first relative distance, it is determined whether the first limiting groove 222 or the limiting protrusion 221 is located below the first limiting rod 42.

[0081] Specifically, the center point of the lower end of the first limiting rod 42 is defined as a first determination point, and the first relative distance refers to the distance from the first determination point to the limiting ring 22 when vertically extending downward.

[0082] Step S22: if yes, control the first sensor to detect a second relative distance and a third relative distance from the end of the first limiting rod to the limiting protrusions located on both sides of the first limiting rod, and determine whether the difference between the second relative distance and the third relative distance is less than a second preset length;

[0083] Specifically, when the projection of the first determination point falls into the first limiting groove 222, the first limiting groove 222 is defined as a mating groove. The boundary line between the mating groove and the limiting protrusions 221 on both sides is located on both sides of the first determination point in the horizontal projection of the first determination point. Then, the second relative distance refers to the distance of the first determination point from the midpoint of the first boundary line on one side, and the third relative distance refers to the distance of the first determination point from the midpoint of the second boundary line on the other side.

[0084] When the error between the second relative distance and the third relative distance is within the range of the second preset length, it means that the projections of the first boundary line, the second boundary line and the first limiting rod 42 will not come into contact, thus enabling safe descent.

[0085] Step S23: If yes, then the power tool is determined to be in a replaceable state.

[0086] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A power tool, characterized in that, The power tool includes: A housing (10) having a receiving chamber (11) inside; A first rotating shaft (20) passes through the housing (10), and a saw blade (21) is installed at the end of the first rotating shaft (20) away from the housing (10); A drive assembly (30) is disposed within the receiving chamber (11) to drive the first rotating shaft (20) to rotate; A stop assembly, wherein the stop assembly is disposed on one side of the first rotating shaft (20), the stop assembly comprising: The first stop (40) is used to cooperate with the first rotating shaft (20) to restrict the rotation of the first rotating shaft (20); The second stop (50) is provided on one side of the first stop (40) to restrict the first stop (40) from approaching the first rotating shaft (20); When the power tool is in a replaceable state, the second stop (50) releases its restriction on the first stop (40); A limiting ring (22) is sleeved on the first rotating shaft (20) and fixedly connected to the first rotating shaft (20). The outer periphery of the limiting ring (22) is provided with a plurality of limiting protrusions (221), and a first limiting groove (222) is formed between every two limiting protrusions (221). When the first stop (40) engages with the first limiting groove (222), the limiting protrusion (221) abuts against the first stop (40) to restrict the rotation of the limiting ring (22); The outer side of the housing (10) is provided with a second limiting groove (12), and the first stop part (40) includes: Press cap (41), the press cap (41) is disposed in the second limiting groove (12); The first limiting rod (42) passes through the bottom plate (13) that forms the second limiting groove (12). One end of the first limiting rod (42) is fixedly connected to the pressing cap (41), and the other end of the first limiting rod (42) is used to cooperate with the first limiting groove (222) to restrict the rotation of the limiting ring (22). A reset spring (43) is sleeved on the first limiting rod (42), and one end of the reset spring (43) is connected to the pressing cap (41), and the other end of the reset spring (43) is connected to the base plate (13), so that the pressing cap (41) is subjected to a force away from the first rotating shaft (20); The second stop (50) includes: A control console (51) is disposed within a receiving chamber (11); The second limiting rod (52) has one end connected to the console (51) and the other end abutting against the pressing cap (41) to restrict the pressing cap (41) from approaching the first rotating shaft (20); The first sensor (53) is connected to the console (51) and is used to detect the relative position of the limiting ring (22) and the first limiting rod (42). When the first limiting groove (222) on the limiting ring (22) is aligned with the first limiting rod (42), the power tool enters the replaceable state, and the second limiting rod (52) moves away from the pressing cap (41).

2. The power tool according to claim 1, characterized in that, The first stop (40) further includes: A swing rod (44) is provided at one end, which is rotatably connected to the first side plate (14) forming the second limiting groove (12), and the other end of the swing rod (44) is provided with a sliding protrusion. The pressing cap (41) has a second side plate (411) on the side near the first side plate (14), and the second side plate (411) has a sliding groove (412), which is configured as a closed heart-shaped groove. The sliding protrusion slides in conjunction with the sliding groove (412). When the first limiting rod (42) moves toward the first rotating shaft (20), the sliding protrusion moves to the upper part of the sliding groove (412) so that the first stop (40) is automatically locked.

3. The power tool according to claim 1, characterized in that, The first limiting rod (42) is provided with a third limiting groove (421), and the bottom plate (13) is provided with an anti-detachment ring (45) that cooperates with the third limiting groove (421) on the side near the first rotating shaft (20); When the first limiting rod (42) moves away from the first rotating shaft (20), the anti-detachment ring (45) abuts against the base plate (13).

4. The power tool according to claim 2, characterized in that, The second side plate (411) is provided with a guide groove (413), which is arranged along the direction of movement of the first limiting rod (42); The first side plate (14) is provided with a guide rail (141) that cooperates with the guide groove (413) to limit the movement trajectory of the pressing cap (41).

5. The power tool according to claim 1, characterized in that, The driving component (30) includes: A drive motor (31) is provided in the receiving chamber (11), and one end of the drive motor (31) is provided with a first motor shaft (311); The first motor shaft (311) is provided with a first transmission gear (312), and the first rotating shaft (20) is provided with a second transmission gear (23) that cooperates with the first transmission gear (312) to drive the first rotating shaft (20) to rotate.

6. The power tool according to claim 1, characterized in that, The power tool employs a shaft positioning method, which includes: Control the second stop (50) to lock the first limit rod (42), and detect in real time whether the power tool is in working state; If not, the first sensor (53) is controlled to collect the position information of the limiting ring (22), and the position information is used to determine whether the power tool is in a replaceable state; If so, then control the second stop (50) to lock the first limit rod (42); Control the first limiting rod (42) to lock the limiting ring (22), and replace the saw blade (21) at the end of the first rotating shaft (20).

7. The power tool according to claim 6, characterized in that, The control of the first sensor (53) to collect the position information of the limiting ring (22) and to determine whether the power tool is in a replaceable state based on the position information includes: Control the first sensor (53) to obtain the first relative distance from the end of the first limiting rod (42) to the outer surface of the limiting ring (22) directly below the first limiting rod (42), and determine whether the first relative distance conforms to the first preset length; If so, the first sensor (53) is controlled to detect the second relative distance and the third relative distance from the end of the first limiting rod (42) to the limiting protrusions (221) located on both sides of the first limiting rod (42), and to determine whether the difference between the second relative distance and the third relative distance is less than the second preset length; If so, the power tool is determined to be in a replaceable state.

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