Power Tools

Abstract

The present invention discloses an electric tool, which comprises: a main body, the main body comprises a casing, and a motor, a switch assembly and an electric control assembly installed in the casing, the electric control assembly being electrically connected to the switch assembly and the motor respectively; a battery pack, which is detachably coupled to the main body and has a connected state in which it is conductively connected to the electric control assembly and a separated state in which it is disconnected from the electric control assembly; an electric control unit, the electric control unit comprising a power circuit board; a mounting base, the mounting base being provided with an opening; a docking unit, the docking unit conductively connecting the battery pack and the electric control unit, the docking unit being plugged into the mounting base through the opening, and cooperating with the mounting base to form an installation space, the electric control unit being installed in the installation space; and a blocking unit, the blocking unit being plugged into the opening to prevent the packaging glue from overflowing from the opening.

Description

Technical Field

[0001] The present invention relates to the technical field of electric tools, and in particular to an electric tool. Background Art

[0002] With the development of technology of electronic control components such as PCB, their application is becoming more and more extensive, but the existing PCB components have the following problems: PCB components are usually connected to the power supply through soft connections such as wires. Due to the poor stability of the connection ends of the wires and electrical components, the connection is easily failed due to external reasons such as vibration or aging during use, and the reliability is low, which affects the service life and increases the maintenance cost. The wiring method of the wires is relatively complicated, which is not conducive to the structural setting inside the casing, increases the manufacturing difficulty and cost of the production line; and is not conducive to the reduction and optimization of the size of the whole machine; in addition, in the existing power tools, the PCB electronic control components have low integration, non-compact structure, and occupy more space, which is not conducive to the miniaturization and sophistication of the whole machine. Summary of the invention

[0003] In order to solve the deficiencies of the prior art, an object of the present invention is to provide an electric tool with high reliability, compact structure and conducive to reducing the size of the whole machine.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] An electric tool, comprising:

[0006] A host, the host comprising a housing, and a motor, a switch assembly and an electric control assembly installed in the housing, the electric control assembly being electrically connected to the switch assembly and the motor respectively;

[0007] A battery pack is detachably coupled to the host, and has a connected state in which it is electrically conductive with the electronic control component and a disconnected state in which it is disconnected from the electronic control component;

[0008] The electronic control assembly comprises:

[0009] An electronic control unit, the electronic control unit comprising a power circuit board;

[0010] A mounting base, wherein the mounting base is provided with an opening;

[0011] A docking unit, the docking unit conductively connects the battery pack and the electronic control unit, the docking unit is plugged into the mounting base through the opening, and cooperates with the mounting base to form an installation space, and the electronic control unit is installed in the installation space;

[0012] and a blocking unit, wherein the blocking unit is plugged into the opening to prevent the packaging glue from overflowing from the opening.

[0013] Furthermore, the mounting base includes a bottom plate and a wall plate, wherein the wall plate is arranged along an edge of the bottom plate; and the opening is provided on the wall plate.

[0014] Furthermore, the barrier unit is provided with a clamping groove which is slidably connected to the wall panels on both sides of the opening.

[0015] Furthermore, the electronic control unit further comprises a control circuit board, wherein the control circuit board and the power circuit board are stacked and arranged in the mounting base, and the power circuit board is in contact with the mounting base.

[0016] Furthermore, the docking unit includes a connecting seat and a conductive part arranged on the connecting seat, the connecting seat is plugged into the base plate, the conductive part includes an electrically controlled conductive part and a power conductive part that are conductively connected, and a conductive limiter is provided on the power circuit board, the conductive limiter is conductively matched with the electrically controlled conductive part and limits the power circuit board.

[0017] Furthermore, the conductive part includes an electrically controlled conductive part and a power conductive part which are electrically connected, and a conductive limiter is provided on the power circuit board, and the conductive limiter is electrically coordinated with the electrically controlled conductive part and limits the power circuit board.

[0018] Furthermore, the mounting base further comprises heat dissipation fins, the heat dissipation fins are arranged on a side of the bottom plate away from the electronic control unit, and heat dissipation channels are formed between the heat dissipation fins.

[0019] Furthermore, part or all of the heat dissipation fins extend to the wall plate to form guide fins, guide channels are formed between the guide fins, and the guide channels are connected to the heat dissipation channels.

[0020] Furthermore, the casing is provided with an air inlet and an air outlet, and the guide channel on the mounting base is docked with the air inlet.

[0021] Furthermore, the electric tool further comprises a displacement compensation unit, and the displacement compensation unit is arranged at the contact point between the inner wall of the casing and the electric control component.

[0022] The beneficial effects of the present invention are as follows:

[0023] In the present invention, an opening is provided on the mounting base, and the docking unit is plugged into the mounting base from the opening. The structure is simple and the assembly is convenient, thereby simplifying the assembly process on the basis of improving the integration degree. At the same time, a barrier unit is provided to block the opening to prevent the overflow of the packaging glue, which can effectively prevent the packaging glue from overflowing from the opening, thereby meeting the requirements for filling glue and ensuring the electrical performance of the whole machine. The barrier unit is plugged into the wall panel, and the connection is simple and the assembly is convenient, thereby simplifying the assembly process.

[0024] The present invention integrates the docking unit, the electronic control unit and the mounting base into a whole. The electronic control component can not only realize the connection between the host and the power supply, but also realize the heat dissipation of the electronic control unit. It integrates power conduction, control and heat dissipation into one, further improves the integration, reduces the occupied space, and is conducive to the reduction of the size of the whole machine. On the other hand, it provides a technical solution with strong versatility and high adaptability, which can be applied to other similar tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the electric tool of the present invention;

[0026] Figure 2 yes Figure 1 The schematic diagram of the whole machine structure after removing the air inlet filter is shown;

[0027] Figure 3 yes Figure 2 A local enlarged view of point A shown in FIG.

[0028] Figure 4 This is a schematic diagram of the structure of the whole machine after opening the mainframe casing;

[0029] Figure 5 This is a schematic diagram of the structure of the whole machine after removing the battery pack and part of the host casing;

[0030] Figure 6 It is a schematic diagram of the structure of the electric control component of the present invention after being assembled;

[0031] Figure 7 yes Figure 6 Schematic diagram of the structure of the electronic control component after sealing; Figure 8 yes Figure 6 Schematic diagram of the structure of the electronic control component after removing the connecting wires;

[0032] Fig. 9 yes Figure 8 A structural diagram from another angle;

[0033] Fig.10 yes Figure 7 An exploded schematic diagram of the electronic control components in FIG.

[0034] Fig.11 is a schematic diagram of the assembly of the mounting base and the docking unit of the present invention;

[0035] Fig.12 It is a structural schematic diagram of the mounting base of the present invention;

[0036] Fig.13 yes Fig.12 A top view of the mounting base shown in ;

[0037] Fig.14 yes Fig.12 A bottom view of the mounting base shown in ;

[0038] Fig.15 It is a structural schematic diagram of a docking unit of the present invention;

[0039] Fig.16 yes Fig.15 The front view of the middle docking unit;

[0040] Fig.17 yes Fig.15 Right view of the middle docking unit;

[0041] Fig.18 yes Fig.15 A top view of the middle docking unit;

[0042] Fig.19 It is a schematic structural diagram of the barrier unit of the present invention.

[0043] Description of reference numerals:

[0044] 100-main unit; 110-housing; 120-air inlet; 130-guide ribs; 140-air outlet; 150-displacement compensation unit; 160-filter;

[0045] 200-battery pack;

[0046] 300-motor; 310-fan; 320-switch assembly; 330-output assembly;

[0047] 400-Electronic control components;

[0048] 500-electronic control unit; 510-power circuit board; 511-field effect tube; 512-capacitor; 513-connection hole; 514-support column; 520-control circuit board; 530-wire; 540-screw; 550-isolation column; 560-capacitor circuit board; 570-board-to-board connector;

[0049] 600-mounting base; 610-bottom plate; 611-heat dissipation fins; 612-heat dissipation channel; 620-wall plate; 621-flow guide fins; 622-flow guide channel; 630-opening;

[0050] 700-docking unit; 710-connection seat; 711-card slot; 720-conductive terminal; 730-conductive plug;

[0051] 800-barrier unit; 810-chute;

[0052] 900-glue filling cavity; 910-glue sealing layer. DETAILED DESCRIPTION

[0053] In order to more clearly illustrate the purpose, technical solutions and advantages of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0054] It should be noted that, in the description of the present invention, the terms “first”, “second” and “third” are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0055] like Figure 1 and Figure 2 As shown, the present invention describes an electric tool, specifically a handheld electric angle grinder, which includes a main body 100 and a battery pack 200 detachably coupled to the main body 100 .

[0056] like Figure 5 As shown, the host 100 of the embodiment of the present invention includes a housing 110 and a motor 300 , a fan 310 , a switch assembly 320 , etc. disposed in the housing 110 . The motor 300 drives the fan 310 to rotate and provides power to the output assembly 330 .

[0057] See attached Figure 2 and attached Figure 4 The housing 110 is provided with an air inlet 120 and an air outlet 140; wherein the fan 310 is used to generate airflow and discharge the airflow out of the tool housing 110, and the fan 310 is coaxially arranged with the motor shaft of the motor 300 and rotates with the rotation of the motor 300. Figure 1 The angle grinder in the embodiment of the present invention is further provided with a detachable filter 160 outside the air inlet 120 to prevent external dust from entering.

[0058] The output assembly 330 includes an output shaft and a tool accessory that cooperates with the output shaft. The tool accessory in this embodiment includes a grinding disc (not shown in the figure).

[0059] See attached Figure 5 The embodiment of the present invention further includes an electric control component 400 disposed in the housing 110, wherein the housing 110 includes a left housing and a right housing, and the electric control component 400 is clamped between the limiting ribs of the left and right housings, and the left and right housings are clamped together and fixed as a whole by screws.

[0060] like Figure 5 and Figure 6As shown, the electric control component 400 in the embodiment of the present invention is used to connect the battery pack 200. At the same time, the electric control component 400 is also electrically connected to the switch component 320 and the motor 300 through the wire 530 respectively. The switch component 320 controls the on and off of the motor 300 to control the working state of the whole machine.

[0061] The housing 110 of the embodiment of the present invention includes a front end, a hand-held portion and a rear end, the motor 300, the fan 310 and the switch assembly 320 are arranged at the hand-held portion, the output assembly 330 is arranged at the front end, and the electronic control assembly 400 is arranged at the rear end, wherein the rear end is the extension leg where the angle grinder is connected to the battery pack 200.

[0062] like Figure 6 As shown, the electric control assembly 400 of the embodiment of the present invention includes an electric control unit 500, a mounting base 600, a docking unit 700 and a barrier unit 800. The docking unit 700 is conductively connected between the battery pack 200 and the electric control unit 500, and the mounting base 600 is provided with a mounting portion. The docking unit 700 is connected to the mounting base 600 through the mounting portion to form an installation space, and the electric control unit 500 is installed in the installation space.

[0063] See attached Fig.10 The electric control unit 500 includes a power circuit board 510 and a control circuit board 520, wherein the control circuit board 520 outputs a control instruction to control the operation of the motor 300, and the power circuit board 510 and the control circuit board 520 are electrically connected. Of course, as an alternative embodiment, the electric control assembly 400 may also include only one circuit board, that is, the power circuit board and the control circuit board are combined into one circuit board.

[0064] like Fig.10 As shown, the power circuit board 510 is provided with, for example, a field effect transistor 511 (MOS transistor) and a capacitor 512, wherein the field effect transistor 511 is used to control the on and off of the power supply and the motor 300 according to a control signal, and the capacitor 512 is arranged close to the field effect transistor 511 and integrated with the field effect transistor 511 on the power circuit board 510. By arranging the capacitor 512 close to the field effect transistor 511 and arranging the field effect transistor 511 on the same circuit board, the filtering performance of the capacitor 512 is improved.

[0065] The control circuit board 520 is provided with a microcontroller, such as a single chip microcomputer, for detecting and controlling power on / off, temperature, current, etc., so as to realize power on / off control, over-temperature protection and over-current protection.

[0066] The power circuit board 510 in this embodiment is arranged close to or abutting the mounting base 600. The power circuit board 510 is an aluminum substrate. A printed circuit is formed on one surface of the aluminum substrate and electronic components are installed. The other surface of the aluminum substrate is a non-working surface. The non-working surface and the mounting base 600 are installed on the bottom plate 610 and in contact with the bottom plate 610. Since the mounting base 600 and the power circuit board 510 are both aluminum bases and substrates, they have good thermal conductivity, so that the heat generated by the field effect tube 511 on the power circuit board 510 can be transferred and dissipated in time, thereby improving the heat dissipation efficiency of the electronic control unit 500.

[0067] like Fig.10 As shown, the control circuit board 520 and the power circuit board 510 in the embodiment of the present invention are stacked in the mounting base 600. The control circuit board 520 and the power circuit board 510 are plug-connected through an electrical connector, wherein the electrical connector adopts a small board-to-board connector 570, and a number of small pins for conductive connection are arranged in the board-to-board connector 570. Specifically, a number of female sockets are arranged on one of the circuit boards, and a number of male plugs that are matched with the female sockets are arranged on the other circuit board, thereby realizing the stacking arrangement of the power circuit board 510 and the control circuit board 520. At the same time, the combined height of the small board-to-board connector 570 does not exceed 4 mm. Due to the low combined height, the height of the wall plate 620 of the mounting base 600 can be further reduced on the basis of meeting the requirements of glue potting and sealing, thereby further reducing the height dimension of the mounting base 600.

[0068] At least two spacer columns 550 are directly provided between the control circuit board 520 and the power circuit board 510. The spacer columns 550 are installed on the control circuit board 520 to ensure that the control circuit board 520 and the power circuit board 510 are separated by a predetermined distance to avoid failure and damage of electrical components due to the control circuit board 520 applying force to the electrical components on the surface of the power circuit board 510.

[0069] The power circuit board is independently arranged and placed close to the mounting base, ensuring timely heat dissipation of the power circuit board. By stacking the control circuit board and the power circuit board separately on the mounting base, the size of the board body and the bottom wall of the mounting base is reduced; the size of the mounting base is further reduced, which is conducive to reducing the size of the whole machine; and it is also possible to install the electric control component 400 at the extension without increasing the size of the extension foot of the whole machine. At the same time, since the electric control component is installed in the grip handle of the housing, the reduction in the size of the electric control component reduces the size of the grip handle of the whole machine, making it more convenient for users to hold and giving users a better user experience.

[0070] Furthermore, by directly plugging and fixing the control circuit board 520 onto the power circuit board 510, the operation is simple and of low difficulty, and complicated processes such as wire welding are eliminated. Since the reliability of the welding connection is low, the board-to-board connector 570 is used to further improve the reliability of the connection, and the convenient assembly is conducive to the improvement of the production line capacity.

[0071] As an alternative implementation, the power circuit board and the control circuit board of the present invention may also be connected in other ways, such as wire connection, as long as the two are electrically conductively connected.

[0072] See attached Figure 8-10 In this embodiment, a capacitor circuit board 560 is also provided which is stacked on the power circuit board 510, and the projections of the capacitor circuit board 560 and the control circuit board 520 on the surface of the power circuit board 510 do not intersect. In the embodiment of the present invention, three capacitors 512 are welded in parallel on the capacitor circuit board, and then the capacitor circuit board 560 is welded to the power circuit board 510. A jack is provided on the capacitor circuit board 560, and a copper support column 514 is provided on the power circuit board 510. During installation, the three capacitor patches are first welded to the capacitor circuit board, and then the jack on the capacitor circuit board is inserted into the support column on the power board 510, and finally fixed by welding. By providing the capacitor circuit board, the three capacitors are not directly installed on the power circuit board 510, but are welded and fixed to the power circuit board 510 by means of the capacitor circuit board, which effectively reduces the size of the power circuit board, thereby reducing the size of the mounting base, which is conducive to reducing the size of the whole machine, especially the size of the spread leg.

[0073] Of course, the number of capacitors is not limited to three, and can be set according to specific needs. The capacitor circuit board can also be soldered on the control circuit board 520 using a surface mount soldering method.

[0074] The mounting base 600 of the embodiment of the present invention at least dissipates heat for the power circuit board 510. Figure 11-13 As shown, the mounting base 600 includes a bottom plate 610 and a wall plate 620 . The wall plate 620 is arranged along the edge of the bottom plate 610 . An opening 630 is provided on the wall plate 620 . The opening 630 constitutes the above-mentioned mounting portion. The docking unit 700 is connected to the mounting base 600 via the opening 630 .

[0075] By providing an opening 630 on the mounting base 600, the docking unit 700 is plugged into the mounting base through the opening 630, which has a simple structure and is easy to assemble, thereby simplifying the assembly process while improving the integration.

[0076] The mounting base 600 of the embodiment of the present invention further includes heat dissipation fins 611 and guide fins 621. Fig.14As shown, the heat dissipation fins 611 are arranged on a side of the bottom plate 610 away from the electronic control unit 500 , and heat dissipation channels 612 are formed between the heat dissipation fins 611 .

[0077] See attached Figure 12-14 In this embodiment, part of the heat dissipation fins 611 extend to the wall plate 620 to form guide fins 621, and guide channels 622 are formed between the guide fins 621. The guide channels 622 are connected to the heat dissipation channel 612. After the external airflow enters the guide channel 622 through the air inlet 120 on the host housing 110, it enters the heat dissipation channel 612 through the guide channel.

[0078] The heat dissipation fins 611 and the guide fins 621 in the embodiment of the present invention are both ribs protruding from the mounting base 600. The mounting base 600 in this embodiment is made of aluminum material, and the heat dissipation fins 611 and the guide fins 621 are both integrally formed with the mounting base 600.

[0079] By arranging heat dissipation fins on the base plate in contact with the power circuit board to form a heat dissipation channel, the heat dissipation effect and efficiency are further improved, and effective heat dissipation of the power components is achieved. By arranging guide fins and guide channels, the external airflow can be smoothly introduced into the tool in a timely and effective manner, thereby increasing the circulation speed of the airflow on the back of the mounting base, improving the heat dissipation effect, and ensuring the electrical performance of the circuit.

[0080] Of course, as an alternative implementation, all the heat dissipation fins 611 may be extended to the adjacent wall panels 620 to form guide fins 621 .

[0081] As another alternative implementation, independent heat dissipation fins 611 and guide fins 621 may be respectively provided on the bottom plate 610 and the wall plate 620, and it is only necessary that the guide channels generated by the guide fins are respectively connected to the air inlet and the heat dissipation channel.

[0082] It should be noted that while the guide channel 622 guides the external airflow into the interior of the casing 110, it also takes away the heat on the wall panel 620, so the guide channel 622 also plays a role in heat dissipation; in addition, the heat dissipation fins 611 and the guide fins 621 have arc-shaped transition sections at the direction change points to facilitate the smooth flow of air.

[0083] The outlet direction of the heat dissipation channel 612 can be set along the direction of the heat dissipation airflow flow path in the casing 110 to guide the airflow in the heat dissipation channel 612 to move smoothly along the heat dissipation airflow flow path in the host 100, avoiding the situation where the heat dissipation airflow in the entire machine is blocked due to different setting directions.

[0084] like Figure 2-Figure 4As shown, a guide rib 130 is provided at the air inlet 120 in this embodiment, wherein the guide fin 621 in the embodiment of the present invention is arranged corresponding to the guide rib 130, so that the air inlet 120 is connected with the guide channel 622, thereby ensuring that the external air can directly enter the guide channel 622 through the air inlet 120, and quickly enter the heat dissipation channel 612 from the guide channel 622, so as to facilitate the rapid and smooth circulation of the cooling airflow in the entire machine casing 110, thereby quickly taking away the heat generated on the power circuit board 510 and improving the heat dissipation efficiency.

[0085] like Fig.15 As shown, the docking unit 700 of the embodiment of the present invention includes a plurality of conductive members and a connection seat 710. The conductive members are arranged on the connection seat 710. Fig.11 , wherein the connecting base 710 is plugged into the bottom plate 610 of the mounting base 600 through the opening 630 .

[0086] like Figure 15-18 As shown, in this embodiment, a card slot 711 adapted to the base plate 610 is provided on the connecting seat 710, and the connecting seat 710 is inserted on the mounting base 600 along a surface direction parallel to the base plate 610, wherein the base plate 610 is inserted in the card slot 711. When the connecting seat 710 is plugged into place relative to the mounting base 600, the space formed by the connecting seat 710 and the mounting base 600 is the installation space of the power circuit board 510 and the control circuit board 520.

[0087] The conductive member of this embodiment is conductively connected to the battery pack 200 and the electric control unit 500, wherein the conductive member includes an electric control conductive member and a power conductive member, and the electric control conductive member and the power conductive member are conductively connected to each other. Fig.15 and attached Fig.17 , wherein the electric control conductive member is a plurality of conductive terminals 720 disposed at one end of the connection base 710 and exposed outside the connection base 710, and the conductive terminals 720 are used to conduct electricity with the electric control unit 500, and the power conductive member is a plurality of conductive plugs 730 disposed at the other end of the connection base 710 and exposed outside the connection base 710, and the conductive plugs 730 are used to conduct electricity with the connection port of the battery pack 200. See the attached Fig.11 When the connection base 710 is assembled with the bottom plate 610 of the mounting base 600 , the conductive terminals 720 and the conductive plugs 730 are respectively located on both sides of the bottom plate 610 .

[0088] When in use, insert the battery pack along the guide ribs of the main unit and connect it to the conductive terminal 720. Figure 5It can be seen that since the conductive plug 730 of the electric control component 400 in the embodiment of the present invention needs to be plugged into the battery pack, the control circuit board 520, the power circuit board 510 and the bottom plate 610 of the mounting base 600 of the present invention are roughly parallel to the plug-in and unplugging direction of the battery pack. It is precisely because of the above-mentioned arrangement in the present application that the size of the power circuit board 510 is reduced, which allows the electric control component 400 to be installed at the foot without increasing the foot size of the whole machine.

[0089] The power circuit board 510 in this embodiment is also provided with a plurality of conductive stoppers that are electrically matched with the conductive terminals 720 and limit the power circuit board 510. Fig.10 The conduction limiting member is a plurality of connection holes 513 provided on the power circuit board 510 , wherein the power board 510 is connected to the conductive terminal 720 through the connection holes 513 and then fixed to the conductive terminal 720 by welding and conductively connected.

[0090] like Fig.10 As shown, during assembly, the power circuit board 510 is inserted into the conductive terminal 720 along the axial direction and then fixed to the bottom plate 610 of the mounting base 600 by screws 540. Two screws 540 pass through the control circuit board, the spacer 550 and the power circuit board 510 in sequence and then fixed to the mounting base 600. Due to the provision of the above-mentioned connection holes 513, automatic guidance and positioning of the assembly of the power circuit board 510 are achieved during installation, which simplifies the assembly operation process of the power circuit board 510 and further improves the production capacity of the production line.

[0091] like Figure 7-10 As shown, the electric control assembly 400 in the embodiment of the present invention further includes a blocking unit 800, and the blocking unit 800 is connected to the wall plate 620 to block the opening 630, wherein see the attached Fig. 9 After the barrier unit 800 is assembled with the mounting base 600, one end thereof abuts against the power circuit board 510 and the connecting base 710, and the other end is roughly flush with the ends of the wall panels 620 on both sides thereof. At this time, after the barrier unit 800 is assembled with the mounting base 600, the inner wall of the barrier unit 800, the wall panels of the mounting base 600 and the surface of the electronic control unit are combined to form a glue filling cavity 900, and the glue filling cavity 900 is used to fill the packaging glue. By setting the barrier unit, the packaging glue can be effectively prevented from overflowing from the opening, thereby meeting the requirements for glue filling and ensuring the electrical performance of the whole machine.

[0092] Specifically, see Appendix Fig. 9 and 19, the barrier unit 800 is provided with a slide groove 810 on both sides, and the barrier unit 800 is slidably plugged with the wall panels 620 on both sides of the opening 630 through the slide groove 810. During assembly, the barrier unit 800 is inserted in a direction parallel to the wall panels 620 and finally abuts against the surface of the power circuit board 510, and then the electronic components located in the glue filling cavity 900 are filled with glue to form a sealing layer 910. The sealing layer 910 encapsulates the exposed conductive pins of the components, thereby achieving the fixed sealing of the electronic components. Usually, the sealant uses epoxy resin to achieve waterproof, dustproof, anti-corrosion, sealing and heat conduction of the electrical components, thereby ensuring the mechanical strength of the whole machine and avoiding the decline of electrical performance. By setting a slide groove that is slidably connected to the wall panel on the barrier unit, the barrier unit is slidably connected to the wall panel, and the connection is simple and the assembly is convenient, thereby simplifying the assembly process.

[0093] In the embodiment of the present invention, a plurality of displacement compensation units 150 are further provided on the inner wall of the rear end of the housing 110, wherein the displacement compensation units 150 are provided at the contact between the inner wall of the housing 110 and the electric control component 400. Figure 5 , the displacement compensation unit 150 can be an elastic washer or an elastic gasket. Since the conductive plug 730 is directly integrated on the electric control component 400 in this embodiment. Compared with the wire connection, the connection between the conductive plug 730 and the battery pack 200 in this embodiment is a hard connection. Therefore, in order to avoid the vibration during the use of the tool causing the conductive plug 730 to move relative to the interface of the battery pack 200, thereby causing the conductive plug 730 to have a poor contact with the battery pack 200 or damage to the interface, the elastic displacement compensation unit 150 is provided, so that the electric control component 400 can be in elastic contact with the inner wall of the housing 110. When vibration occurs during the use of the tool, the electric control component 400 can generate a small displacement compensation through the displacement compensation unit 150 to avoid a large relative movement between the conductive plug 730 and the interface of the battery pack 200, thereby improving the service life of the tool and the user experience.

[0094] As an alternative embodiment, the electronic control component of the present invention can also be applied to other handheld power tools, such as electric drills, screwdrivers, sanders, wrenches, polishers, gun drills, electric hammers, electric picks, etc., with an operating current of 20A-45A and a maximum allowable operating current of about 65A.

[0095] In the present invention, by integrating the docking unit, the electronic control unit and the mounting base into a whole, the electronic control component can not only realize the connection between the host and the power supply, but also realize the heat dissipation of the electronic control unit, integrating power conduction, control and heat dissipation into one, further improving the integration, reducing the occupied space, and facilitating the reduction of the size of the whole machine; on the other hand, it provides a technical solution with strong versatility and high adaptability, which can be applied to other similar tools.

[0096] The assembly method of the electric control assembly in the embodiment of the present invention is as follows:

[0097] (1) Assemble the docking unit and the mounting base to form the installation space for the electronic control unit, specifically:

[0098] The connecting seat 710 of the docking unit 700 is plugged and fixed on the bottom plate 610 of the mounting base 600 from the opening 630 of the mounting base 600, so that the bottom plate 610 of the mounting base is inserted into the card slot 711 of the connecting seat 710; wherein the docking unit is plugged with the mounting base 600 along a direction parallel to the bottom plate 610 of the mounting base.

[0099] (2) Install the fixed electronic control unit in the installation space, specifically:

[0100] Insert the power circuit board 510 of the electric control unit 500 along the conductive terminal 720 of the docking unit and fix it to the bottom plate 610 of the mounting base; wherein the power circuit board 510 is installed on the mounting base 600 in a direction perpendicular to the bottom plate 610 of the mounting base, and after being installed in place, it is fixedly connected to the bottom plate 610 by screws 540;

[0101] Then, the control circuit board 520 of the electric control unit is electrically connected to the power circuit board 510; specifically:

[0102] Insert the male plug or female socket of the control circuit board 520 into the female socket or male plug of the power circuit board 510 .

[0103] (3) Covering the opening 630 of the mounting base 600, specifically:

[0104] The barrier unit 800 is inserted into the sliding groove 810 of the barrier unit 800 in a direction perpendicular to the bottom plate 610 . After the barrier unit 800 and the wall plate 620 are plugged into place, the opening 630 is blocked.

[0105] (4) Seal the electronic control unit, specifically:

[0106] Glue is poured into the glue filling cavity formed by the blocking unit 800 and the mounting base 600 to form a sealing glue layer 910 .

[0107] After the electronic control component 400 is assembled, the steps of installing the electronic control component 400 into the housing of the host 100 are as follows:

[0108] First, a predetermined number of displacement compensation units 150 are preset at the position where the inner wall of the housing 110 contacts the electric control component 400 , for example, elastic washers or elastic gaskets are clamped in preset clamping grooves.

[0109] Then, the electronic control component 400 is installed in the left casing or the right casing and fixed by the limiting ribs on the inner wall of the casing, and the extended wire on the electronic control component 400 is fixedly connected to the switch component 320 or the motor 300; the installation method of other structural parts in the host 100 can refer to the existing technology and will not be repeated here.

[0110] Finally, snap the other half of the housing onto the housing and secure them with screws.

[0111] The present invention provides an opening on the mounting base for allowing the docking unit to be inserted, and the docking unit and the mounting base can be assembled by simple plugging. After the assembly is completed, the power circuit board is inserted into the mounting base along the conductive terminals and fixed thereto. Since the conductive terminals on the docking unit play a role in limiting and guiding the installation of the power circuit board, the difficulty of assembling the power circuit board is simplified and the convenience and accuracy of its operation are improved, thereby ultimately improving the assembly efficiency and achieving an increase in production capacity.

[0112] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. An electric tool comprising: A host, the host comprising a housing, and a motor, a switch assembly and an electric control assembly installed in the housing, the electric control assembly being electrically connected to the switch assembly and the motor respectively; A battery pack is detachably coupled to the host, and has a connected state in which it is electrically conductive with the electronic control component and a disconnected state in which it is disconnected from the electronic control component; The electric control assembly is arranged at the rear end of the housing, and the rear end is where the electric tool and the battery pack are connected; The electronic control assembly comprises: An electronic control unit, the electronic control unit comprising a power circuit board; A mounting base, wherein the mounting base is provided with an opening; A docking unit, the docking unit conductively connects the battery pack and the electronic control unit, the docking unit is plugged into the mounting base through the opening, and cooperates with the mounting base to form an installation space, and the electronic control unit is installed in the installation space; and a blocking unit, wherein the blocking unit is plugged into the opening to prevent the packaging glue from overflowing from the opening.

2. The electric tool according to claim 1, characterized in that: The mounting base comprises a bottom plate and a wall plate, wherein the wall plate is arranged along the edge of the bottom plate; and the wall plate is provided with the opening.

3. The electric tool according to claim 2, characterized in that: The blocking unit is provided with a clamping groove which is slidably connected with the wall panels on both sides of the opening.

4. The electric tool according to claim 2, characterized in that: The electronic control unit further includes a control circuit board, which is stacked with the power circuit board in the mounting base, and the power circuit board is in contact with the mounting base.

5. The electric tool according to claim 4, characterized in that: The docking unit includes a connecting seat and a conductive part arranged on the connecting seat, the connecting seat is plugged into the base plate, the conductive part includes an electrically controlled conductive part and a power conductive part that are electrically connected, and a conductive limiter is provided on the power circuit board, the conductive limiter is conductively matched with the electrically controlled conductive part and limits the power circuit board.

6. The electric tool according to claim 5, characterized in that: The conductive part includes an electrically controlled conductive part and a power conductive part which are electrically connected. A conductive limiting part is arranged on the power circuit board. The conductive limiting part is electrically matched with the electrically controlled conductive part and limits the power circuit board.

7. The electric tool according to claim 6, characterized in that: The mounting base further comprises heat dissipation fins, which are arranged on a side of the bottom plate away from the electronic control unit, and a heat dissipation channel is formed between the heat dissipation fins.

8. The electric tool according to claim 7, characterized in that: Part or all of the heat dissipation fins extend to the wall plate to form guide fins, and guide channels are formed between the guide fins, and the guide channels are connected to the heat dissipation channels.

9. The electric tool according to claim 8, characterized in that: The housing is provided with an air inlet and an air outlet, and the guide channel on the mounting base is connected to the air inlet.

10. The electric tool according to claim 9, characterized in that: The electric tool further comprises a displacement compensation unit, which is arranged at a position where the inner wall of the casing contacts the electric control component.

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