A brushless motor control switch for electric tools

Abstract

The present invention discloses a brushless motor control switch for an electric tool, which relates to the field of control switches and solves the problem that when the brushless motor control switch of an existing electric tool is used, a resistance rod and a connection brush rub against each other for a long time at a certain position, which easily leads to depression and unstable connection. The brushless motor control switch comprises a shell, a control mechanism, a rotating mechanism and a guide mechanism, wherein a resistance rod is arranged in the shell, the control mechanism comprises a rolling wheel, the rotating mechanism comprises a rotating ring, the guide mechanism comprises a guide column, and a slope groove is provided on the side of the guide column. The present invention adjusts the position of the rolling wheel through the control mechanism and ensures that the outer wall of the rolling wheel is tightly fitted with the resistance rod, thereby realizing a circuit control function. In the process of the control mechanism driving the rolling wheel to move and adjust, the rotating ring is linked by the rotating mechanism to perform intermittent unidirectional rotation, thereby adjusting the contact position of the resistance rod and the outer wall of the rolling wheel, thereby avoiding the situation where the same position is continuously rubbed and causes depression.

Description

Technical Field

[0001] The present invention relates to the technical field of control switches, in particular to a brushless motor control switch for an electric tool. Background Art

[0002] A brushless DC motor, consisting of a motor and a driver, is a typical mechatronic product. Because it operates in an autonomous manner, it does not require a separate starting winding on the rotor, as is the case with synchronous motors that start under heavy loads under variable frequency speed regulation. It also avoids oscillation and loss of step when subjected to sudden load changes. In power tools (such as drills and cutting machines), a stepless speed control switch is often used in conjunction with a brushless motor to achieve stepless speed control, enhancing flexibility and precision during use.

[0003] Existing stepless speed regulation switches mostly use resistors connected in the circuit to change the resistance value of the resistor in the connected circuit to change the voltage value in the brushless motor, thereby achieving stepless adjustment of the brushless motor speed. However, during the resistor connection adjustment process, it is found that since the connection point is relatively fixed in the sliding position with the resistor surface, long-term use will cause friction on the surface of the resistor rod to produce depressions, and the depressions are prone to disconnection during the conduction process, affecting the resistance adjustment and current transmission stability during the stepless speed regulation process. Summary of the Invention

[0004] An object of the present invention is to provide a brushless motor control switch for an electric tool that is convenient for improving control and circuit connection stability, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a brushless motor control switch for an electric tool, comprising a housing, a control mechanism, a rotating mechanism and a guide mechanism, wherein a resistor rod is provided in the housing, the control mechanism comprises a scroll wheel capable of rolling and fitting with the surface of the resistor rod, for adjusting the position of the scroll wheel and ensuring that the outer wall of the scroll wheel is in close contact with the resistor rod to realize a circuit control function, the rotating mechanism comprises a rotating ring fixedly mounted on the outer wall of one end of the resistor rod, for intermittently rotating the rotating ring in one direction during the process of the control mechanism driving the scroll wheel to move and adjust, thereby adjusting the resistor The contact position between the rod and the outer wall of the rolling wheel avoids the situation where the same position is continuously rubbed and depressed. The guide mechanism includes a guide column coaxially connected to the end of the resistor rod away from the rotating ring. A slope groove is provided on the side of the guide column, which is used to move the rolling wheel to the guide column in a power-off state, and control the rolling wheel to contact the slope groove first when sliding onto the guide column. When the rolling wheel rolls from the guide column to the resistor rod, the position of the slope groove is switched so that the rolling wheel rolls against the outer wall of the guide column, which is convenient for control and circuit connection stability.

[0006] Preferably, the control mechanism also includes a guide frame fixedly installed in the shell, a sliding block is slidably connected to the guide frame, two groups of fixed frames are fixedly connected to the sliding block, a lifting frame is slidably connected to the fixed frame, both ends of the scroll wheel are rotatably connected to the lifting frames on both sides, and a first spring fixedly connected to the fixed frame is fixedly connected to the lifting frame. An adjusting member for adjusting the position of the sliding block is provided in the shell, and a connecting member for circuit connection is provided in the shell, which facilitates the adjustment of the position of the scroll wheel and ensures that the outer wall of the scroll wheel is tightly fitted with the resistance rod to realize the circuit control function.

[0007] Preferably, the connecting part includes a conductive block that is coaxially connected to the end of the resistor rod away from the guide column, a first wire is fixedly connected to the conductive block, and a second wire is fixedly connected to the side of any group of the fixing frame, one end of the second wire is in contact with the side of the rolling wheel and rotates to realize the current transmission function, thereby facilitating circuit connection.

[0008] Preferably, the adjusting member includes a fixed plate fixedly mounted on the guide frame near one end of the guide column, a threaded rod is rotatably connected to the fixed plate, the threaded rod passes through the sliding block and is threadedly connected to the sliding block, a knob is rotatably connected to the shell, and the knob is provided with a rotating member for driving the threaded rod to accelerate the rotation during the slow rotation of the knob, so as to facilitate the adjustment of the position of the sliding block.

[0009] Preferably, the rotating mechanism also includes a driving disk fixedly mounted on one end of the threaded rod, the driving disk is rotatably connected to a ratchet through a clockwork shaft, and the outer wall of the rotating ring is evenly and fixedly connected to a plurality of sets of beveled tooth blocks, so that during the process of the control mechanism driving the scroll wheel to move and adjust, the rotating ring is linked to perform intermittent unidirectional rotation, thereby adjusting the contact position between the resistance rod and the outer wall of the scroll wheel, and avoiding the situation where the same position is continuously rubbed and depressed.

[0010] Preferably, the guide mechanism also includes a first bevel gear coaxially fixedly connected to the guide column at one end away from the resistor rod, a second bevel gear rotatably connected to the shell and meshing with the first bevel gear, the side of the second bevel gear is coaxially fixedly connected to the first gear, and a rack meshing with the first gear is slidably connected to the shell and meshed with the first gear, and a control member for controlling the sliding state of the rack is provided in the guide frame, so as to facilitate moving the scroll wheel onto the guide column in a power-off state, and control the scroll wheel to contact the slope groove first when sliding toward the guide column, and switch the position of the slope groove when the scroll wheel rolls from the guide column to the resistor rod, so that the scroll wheel rolls against the outer wall of the guide column.

[0011] Preferably, the control member includes a device box and a sliding plate which are slidably connected to the inner wall of the guide frame, a second spring which is fixedly connected to the device box is fixedly connected to the side of the sliding plate, a third spring which is fixedly connected to the fixed plate is fixedly connected to the side of the device box away from the sliding plate, the rack is fixedly mounted on the device box, and a limiting member for limiting the position with the guide frame is provided on the device box to facilitate control of the sliding state of the rack.

[0012] Preferably, the limiting member includes a limiting block slidably connected to the side wall of the device box in the vertical direction, and the guide frame is provided with a first triangular groove and a second triangular groove that can be plugged into the tip of the limiting block. The upper side of the limiting block is fixedly connected to a fourth spring fixedly connected to the device box, which facilitates limiting the device box and the guide frame.

[0013] Preferably, the rotating part includes an inner gear ring fixedly installed in the shell, one end of the threaded rod is coaxially fixedly connected to the second gear, and the side of the knob is rotatably connected to multiple groups of third gears meshing with the outer wall of the second gear, and the multiple groups of third gears are respectively meshed with the inner wall of the inner gear ring, so as to facilitate the accelerated rotation of the threaded rod during the slow rotation of the knob.

[0014] Preferably, a display for displaying the resistance value in the connected circuit is fixedly connected to the outer wall of the shell, so as to facilitate the display of the resistance value in the connected circuit.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention provides a brushless motor control switch for an electric tool, which solves the problem of the brushless motor control switch of the existing electric tool that, when in use, the resistance rod and the connecting brush rub against each other for a long time at a certain position, which easily leads to depression and unstable connection. The position of the scroll wheel is adjusted by a control mechanism to ensure that the outer wall of the scroll wheel is in close contact with the resistance rod, thereby realizing the circuit control function. In the process of the control mechanism driving the scroll wheel to move and adjust, the rotating ring is linked by a rotating mechanism to perform intermittent unidirectional rotation to adjust the contact position of the resistance rod and the outer wall of the scroll wheel, thereby avoiding the situation where the same position is continuously rubbed and causes depression. In the power-off state, the scroll wheel is moved to the guide column, and the scroll wheel is controlled to contact the slope groove first. When the scroll wheel rolls from the guide column to the resistance rod, the position of the slope groove is switched so that the scroll wheel rolls in contact with the outer wall of the guide column. The device has a simple structure, is convenient and efficient to operate, ensures the uniformity of the overall wear of the resistance rod, and effectively extends the service life of the resistance rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 This is a schematic diagram of the internal structure of the housing of the present invention;

[0019] Figure 3 It is a schematic diagram of the partial structure of the rotating mechanism of the present invention;

[0020] Figure 4 for Figure 3 Enlarged view of area A in the middle;

[0021] Figure 5 This is a schematic structural diagram of the guide mechanism of the present invention;

[0022] Figure 6 for Figure 5 Enlarged view of area B in the middle;

[0023] Figure 7 It is a schematic diagram of the partial structure of the control mechanism of the present invention;

[0024] Figure 8 for Figure 7 Enlarged view of area C in the middle;

[0025] Figure 9 It is a schematic diagram of the local structure of the control component of the present invention.

[0026] In the figure: 1 - housing; 2 - resistor rod; 3 - control mechanism; 4 - rolling wheel; 5 - rotating mechanism; 6 - rotating ring; 7 - guide mechanism; 8 - guide column; 9 - slope groove; 10 - guide frame; 11 - sliding block; 12 - fixing frame; 13 - lifting frame; 14 - first spring; 15 - adjusting member; 16 - connecting member; 17 - conductive block; 18 - first wire; 19 - second wire; 20 - fixing plate; 21 - threaded rod; 22 - knob; 23 - rotating member; 24-driving plate; 25-ratchet; 26-bevel gear block; 27-first bevel gear; 28-second bevel gear; 29-first gear; 30-rack; 31-control member; 32-device box; 33-sliding plate; 34-second spring; 35-third spring; 36-limiting member; 37-limiting block; 38-first triangular groove; 39-second triangular groove; 40-fourth spring; 41-inner gear ring; 42-second gear; 43-third gear; 44-display. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example 1

[0029] See also Figures 1-9 The brushless motor control switch of a power tool shown in the figure includes a shell 1, a control mechanism 3, a rotating mechanism 5 and a guide mechanism 7. A resistor rod 2 is provided in the shell 1, and a display 44 for displaying the resistance value in the connected circuit is fixedly connected to the outer wall of the shell 1. The control mechanism 3 includes a scroll wheel 4 that can roll and fit with the surface of the resistor rod 2, which is used to adjust the position of the scroll wheel 4 and ensure that the outer wall of the scroll wheel 4 is tightly fitted with the resistor rod 2 to realize the circuit control function. The rotating mechanism 5 includes a rotating ring 6 fixedly mounted on the outer wall of one end of the resistor rod 2, which is used to intermittently rotate the rotating ring 6 in one direction when the control mechanism 3 drives the scroll wheel 4 to move and adjust, so as to adjust the contact position between the resistor rod 2 and the outer wall of the scroll wheel 4, so as to avoid the situation where the same position is continuously rubbed and depressed.

[0030] The guide mechanism 7 includes a guide column 8 which is coaxially connected to the end of the resistor rod 2 away from the rotating ring 6. A slope groove 9 is provided on the side of the guide column 8, which is used to move the rolling wheel 4 onto the guide column 8 when the power is off, and control the rolling wheel 4 to contact the slope groove 9 first when it slides onto the guide column 8. When the rolling wheel 4 rolls from the guide column 8 to the resistor rod 2, the position of the slope groove 9 is switched so that the rolling wheel 4 rolls against the outer wall of the guide column 8.

[0031] The control mechanism 3 also includes a guide frame 10 fixedly installed in the shell 1, and a sliding block 11 is slidably connected in the guide frame 10. Two sets of fixed frames 12 are fixedly connected to the sliding block 11. A lifting frame 13 is slidably connected in the fixed frame 12. The two ends of the rolling wheel 4 are respectively rotatably connected to the lifting frames 13 on both sides. The lifting frame 13 is fixedly connected to a first spring 14 fixedly connected to the fixed frame 12. An adjusting member 15 for adjusting the position of the sliding block 11 is provided in the shell 1, and a connecting member 16 for circuit communication is provided in the shell 1.

[0032] The connecting piece 16 includes a conductive block 17 that is coaxially connected to the end of the resistor rod 2 away from the guide column 8. A first wire 18 is fixedly connected to the conductive block 17. A second wire 19 is fixedly connected to the side of any group of fixed frames 12. One end of the second wire 19 rotates in contact with the side of the rolling wheel 4 to realize the current transmission function.

[0033] The adjusting member 15 includes a fixed plate 20 fixedly mounted on the guide frame 10 near one end of the guide column 8, and a threaded rod 21 is rotatably connected to the fixed plate 20, and the threaded rod 21 passes through the sliding block 11 and is threadedly connected to the sliding block 11. A knob 22 is rotatably connected to the shell 1, and the knob 22 is provided with a rotating member 23 for driving the threaded rod 21 to accelerate the rotation during the slow rotation of the knob 22. The rotating member 23 includes an inner gear ring 41 fixedly mounted in the shell 1, and one end of the threaded rod 21 is coaxially fixedly connected to the second gear 42. The side of the knob 22 is rotatably connected to multiple groups of third gears 43 meshing with the outer wall of the second gear 42, and the multiple groups of third gears 43 are respectively meshed with the inner wall of the inner gear ring 41.

[0034] In this embodiment, the first wire 18 and the second wire 19 are connected to the current input end and the output end respectively. By turning the knob 22, multiple sets of third gears 43 are rolled in the inner gear ring 41, thereby driving the second gear 42 to accelerate the rotation. Finally, only a small number of turns of the knob 22 are required to drive the threaded rod 21 to rotate quickly multiple times. The threaded rod 21 drives the sliding block 11 to slide in the guide frame 10, so that the fixed frame 12 drives the lifting block and the scroll wheel 4 to adjust and move together. The scroll wheel 4 is pushed by the first spring 14 and always maintains a state of contact with the bottom of the resistor plate. The elastic force of the first spring 14 is relatively large, so that the scroll wheel 4 is tighter during the contact process, reducing shaking.

[0035] During the rotation of the knob 22, the rotating mechanism 5 will be linked to control the resistor rod 2 to rotate slowly in one direction relative to the conductive block 17, and the contact position between the resistor rod 2 and the outer wall of the scroll wheel 4 will be adjusted to avoid the situation where the same position is continuously rubbed and depressed. In the power-off state, the scroll wheel 4 is moved to the guide column 8, and the guide mechanism 7 is used to control the scroll wheel 4 to contact the slope groove 9 first when it slides onto the guide column 8. When the scroll wheel 4 rolls from the guide column 8 to the resistor rod 2, the position of the slope groove 9 is switched so that the scroll wheel 4 rolls against the outer wall of the guide column 8.

[0036] The current is transmitted to the conductive block 17 through the first wire 18, and then transmitted to the scroll wheel 4 after passing through the resistance rod 2, and is output through the second wire 19 on the side, thereby realizing the circulation and transmission of the current. The resistance value in the connected circuit is displayed on the display 44, and the control of the knob 22 is visually displayed. At the same time, the reading of the display 44 can be converted to obtain the required brushless motor speed for stepless speed control.

[0037] Example 2

[0038] See also Figures 1-9 This embodiment further illustrates the first embodiment. The guide mechanism 7 shown in the figure further includes a first bevel gear 27 coaxially fixedly connected to the end of the guide column 8 away from the resistor rod 2, a second bevel gear 28 rotatably connected to the housing 1 and meshing with the first bevel gear 27, a first gear 29 coaxially fixedly connected to the side of the second bevel gear 28, a rack 30 meshing with the first gear 29 slidably connected to the housing 1, and a control member 31 for controlling the sliding state of the rack 30 is provided in the guide frame 10.

[0039] The control member 31 includes a device box 32 and a sliding plate 33 that are slidably connected to the inner wall of the guide frame 10. The side of the sliding plate 33 is fixedly connected to a second spring 34 that is fixedly connected to the device box 32. The side of the device box 32 away from the sliding plate 33 is fixedly connected to a third spring 35 that is fixedly connected to the fixed plate 20. The rack 30 is fixedly installed on the device box 32. The device box 32 is provided with a limiting member 36 for limiting the guide frame 10. The limiting member 36 includes a limiting block 37 that is slidably connected to the side wall of the device box 32 in a vertical direction. The guide frame 10 is provided with a first triangular groove 38 and a second triangular groove 39 that can be plugged into the tip of the limiting block 37. The upper side of the limiting block 37 is fixedly connected to a fourth spring 40 that is fixedly connected to the device box 32.

[0040] In this embodiment, when the sliding block 11 slides toward the side of the guide column 8, the limit block 37 is plugged into the first triangular groove 38, and the sliding block 11 preferentially contacts the side of the sliding plate 33 to compress the second spring 34. At this time, since the device box 32 is limited by the limit block 37, it first remains motionless. At this time, one side of the slope groove 9 is at the bottom, so that when the rolling wheel 4 rolls from the resistor rod 2 to the guide column 8, it slides into the slope groove 9 more smoothly, and then continues to roll to the outer wall of the guide column 8. After that, the compression amount of the second spring 34 increases to the set value, the thrust of the fourth spring 40 can no longer continue to clamp the limit block 37 into the first triangular groove 38 to limit the device box 32. At this time, the second spring 34 pushes the device box 32 to slide in the guide frame 10, compressing the third spring 35 while the second spring 34 is extended.

[0041] Until the limit block 37 slides to the second triangular groove 39, the elastic force of the second spring 34 is reduced, and the limit block 37 is pushed into the second triangular groove 39 again for limiting. During this process, the distance moved by the device box 32 just drives the rack 30 to move, so that the first gear 29 drives the second bevel gear 28 to rotate, and the second bevel gear 28 drives the first bevel gear 27 and the guide column 8 to rotate, just controlling the guide column 8 to rotate 180°, and rotating the slope groove 9 to the upper position. The guide column 8 is made of insulating and wear-resistant material, so that the circuit is in a power-off state at this time.

[0042] When power needs to be turned on again, the driving sliding block 11 is driven to slide toward the side of the resistor rod 2, and the rolling wheel 4 rolls from the bottom surface of the guide column 8 to the resistor rod 2. At this time, the resistance force of the sliding block 11 on the sliding plate 33 and the second spring 34 is reduced. After the rolling wheel 4 moves onto the resistor rod 2, under the push of the third spring 35, the limit block 37 releases the plugging of the second triangular groove 39, and the device box 32 is pushed until the limit block 37 is plugged into the first triangular groove 38 again. The device box 32 drives the rack 30 to slide in the opposite direction, so that the first gear 29, the second bevel gear 28, the first bevel gear 27 and the guide column 8 all rotate in the opposite direction. The guide column 8 rotates 180° in the opposite direction, and the slope groove 9 is rotated to the bottom again.

[0043] As the resistor rod 2 is used for a long time, a certain degree of wear and tear will appear on the outer wall of the side close to the guide column 8. At this time, if the guide column 8 is not provided with a slope groove 9, the rolling wheel 4 will collide with the outer edge of the guide column 8 during the rolling process of the rolling wheel 4 toward the side of the guide column 8, increasing the loss of the rolling wheel 4. Since the wear resistance of the guide column 8 is much higher than the wear resistance of the resistor rod 2, the wear of the guide column 8 during the rolling process can be ignored, and it is always ensured that the rolling wheel 4 rolls from high to low when switching at the connection between the guide column 8 and the resistor rod 2, rather than rolling from low to high and colliding.

[0044] Example 3

[0045] See also Figure 2-Figure 8 This embodiment further illustrates the first embodiment. The rotating mechanism 5 shown in the figure further includes a driving disk 24 fixedly mounted on one end of the threaded rod 21. The driving disk 24 is rotatably connected to a ratchet 25 via a spring shaft. The outer wall of the rotating ring 6 is evenly and fixedly connected to multiple sets of bevel gear blocks 26.

[0046] In this embodiment, the threaded rod 21 rotates, which drives the drive disk 24 to rotate. The drive disk 24 drives the tip of the ratchet 25 to contact the straight side of the bevel gear block 26, thereby pushing the bevel gear block 26 to rotate one tooth, switching the angle of the rotating ring 6, and driving the resistor rod 2 to rotate the set angle. Every time the threaded rod 21 rotates one circle, the rotating ring 6 and the resistor rod 2 rotate one grid, so that during the rolling adjustment of the scroll wheel 4, the position of rolling contact with the outer wall of the resistor rod 2 is synchronously and intermittently switched to avoid continuous wear at a single position.

[0047] When the threaded rod 21 rotates in the opposite direction, it will drive the driving disk 24 to rotate in the opposite direction. At this time, the ratchet 25 rotates toward the side of the arc surface. The arc edge of the ratchet 25 fits with the inclined surface of the bevel tooth block 26, and cannot drive the bevel tooth block 26 to rotate and switch during the rotation process. As a result, the angle of the resistor rod 2 will not rotate and switch during the reverse rolling adjustment of the rolling wheel 4. The purpose of this design is to avoid the situation where the rotation state of the resistor rod 2 and the movement state of the rolling wheel 4 are synchronized, so that the resistor rod 2 rotates forward when the rolling wheel 4 moves forward, and rotates in the opposite direction when the rolling wheel 4 moves backward. In this way, the position where the rolling wheel 4 rubs against the resistor rod 2 will form a stable spiral path on the surface of the resistor rod 2, and the area around the path will still not be rubbed, so that the problem of uneven friction will still occur. Therefore, this situation is avoided by this structure.

[0048] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A brushless motor control switch for an electric tool, characterized in that: include: a shell, wherein a resistance rod is arranged in the shell; Also includes: The control mechanism includes a scroll wheel that can roll and fit with the surface of the resistor rod, and is used to adjust the position of the scroll wheel and ensure that the outer wall of the scroll wheel is in close contact with the resistor rod to achieve circuit control function; The rotating mechanism includes a rotating ring fixedly mounted on the outer wall of one end of the resistor rod, which is used to intermittently rotate the rotating ring in one direction when the control mechanism drives the scroll wheel to move and adjust, thereby adjusting the contact position between the resistor rod and the outer wall of the scroll wheel to avoid the situation where the same position is continuously rubbed and causes a depression; The guide mechanism includes a guide column that is coaxially connected to the end of the resistor rod away from the rotating ring, and a slope groove is provided on the side of the guide column for moving the rolling wheel to the guide column in a power-off state, and controlling the rolling wheel to preferentially contact the slope groove when sliding onto the guide column. When the rolling wheel rolls from the guide column to the resistor rod, the position of the slope groove is switched so that the rolling wheel rolls against the outer wall of the guide column. The control mechanism also includes a guide frame fixedly installed in the shell, a sliding block is slidably connected in the guide frame, two sets of fixed frames are fixedly connected to the sliding block, a lifting frame is slidably connected in the fixed frame, two ends of the rolling wheel are respectively rotatably connected to the lifting frames on both sides, and the lifting frame is fixedly connected to a fixed connection with the fixed frame The first spring is connected, and an adjusting member for adjusting the position of the sliding block is provided in the shell. A connecting member for circuit connection is provided in the shell. The connecting member includes a conductive block coaxially connected to the end of the resistor rod away from the guide column. The conductive block is fixedly connected to a first wire, and the side of any group of fixed frames is fixedly connected to a second wire. One end of the second wire fits and rotates with the side of the rolling wheel to realize the current transmission function. The adjusting member includes a fixed plate fixedly mounted on the guide frame near one end of the guide column. A threaded rod is rotatably connected to the fixed plate, the threaded rod passes through the sliding block and is threadedly connected to the sliding block. A knob is rotatably connected to the shell, and the knob is provided with a rotating member for driving the threaded rod to accelerate the rotation during the slow rotation of the knob.

2. The brushless motor control switch for an electric tool according to claim 1, characterized in that: The rotating mechanism also includes a driving disk fixedly mounted on one end of the threaded rod. The driving disk is rotatably connected to a ratchet through a spring shaft. The outer wall of the rotating ring is evenly and fixedly connected to multiple groups of bevel gear blocks.

3. The brushless motor control switch for an electric tool according to claim 1, wherein: The guide mechanism also includes a first bevel gear coaxially fixedly connected to the end of the guide column away from the resistance rod, a second bevel gear rotatably connected in the shell and meshing with the first bevel gear, the side of the second bevel gear is coaxially fixedly connected to the first gear, a rack meshing with the first gear is slidably connected in the shell, and a control component for controlling the sliding state of the rack is provided in the guide frame.

4. The brushless motor control switch for an electric tool according to claim 3, wherein: The control component includes a device box and a sliding plate that are slidably connected to the inner wall of the guide frame. The side of the sliding plate is fixedly connected to a second spring that is fixedly connected to the device box. The side of the device box away from the sliding plate is fixedly connected to a third spring that is fixedly connected to the fixed plate. The rack is fixedly installed on the device box, and the device box is provided with a limiting component for limiting the position with the guide frame.

5. The brushless motor control switch for an electric tool according to claim 4, characterized in that: The limiting component includes a limiting block that is slidably connected to the side wall of the device box in the vertical direction. The guide frame is provided with a first triangular groove and a second triangular groove that can be plugged into the tip of the limiting block. The upper side of the limiting block is fixedly connected to a fourth spring that is fixedly connected to the device box.

6. The brushless motor control switch for an electric tool according to claim 1, wherein: The rotating part includes an inner gear ring fixedly installed in the shell, one end of the threaded rod is coaxially fixedly connected to the second gear, and the side of the knob is rotatably connected to multiple groups of third gears meshing with the outer wall of the second gear, and the multiple groups of third gears are respectively meshed with the inner wall of the inner gear ring.

7. The brushless motor control switch for an electric tool according to claim 1, wherein: A display for displaying the resistance value in the connected circuit is fixedly connected to the outer wall of the shell.

Images