power tools

Abstract

The present invention discloses an electric tool, which includes: a main body, which includes a casing, and a motor, a switch assembly and an electronic control assembly installed in the casing, and the electronic control assembly is 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 conductive with the electronic control assembly and a separated state in which it is disconnected from the electronic control assembly; the electronic control unit includes a power circuit board, and the power circuit board adopts a metal substrate; a mounting base, the power circuit board contacts the mounting base, the mounting base is provided with a plug interface, and the mounting base is a metal base; and 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 via the plug interface, and cooperates with the mounting base to form an installation space, and the electronic control unit is installed in the installation space.

Description

Technical Field

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

[0002] With the development of PCB assembly technology, its application is becoming increasingly widespread. However, existing PCB assemblies have the following problems: the PCB control components of existing power tools are electrically connected to the battery pack inserts at the foot of the extension via flexible connections such as wires. Due to the poor stability of the connection between the wires and the electrical components, the connection is prone to failure during use due to external factors such as vibration or aging, resulting in low reliability, shortening the service life and increasing maintenance costs. Furthermore, the relatively complex wiring of the wires is not conducive to the internal structural configuration of the casing, increasing the manufacturing difficulty and cost of the production line. Furthermore, the existing PCB assemblies have a low degree of integration, a non-compact structure, and occupy a large amount of space, which is not conducive to the miniaturization and sophistication of the entire machine. Summary of the Invention

[0003] In order to address 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 optimizing the size of the entire machine.

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

[0005] An electric tool comprising:

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

[0007] a battery pack, detachably coupled to the host, having 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 component includes:

[0009] An electronic control unit, the electronic control unit including a power circuit board, the power circuit board using a metal substrate;

[0010] A mounting base, the power circuit board contacts the mounting base, the mounting base is provided with a plug interface, and the mounting base is a metal base;

[0011] and a docking unit, wherein the docking unit conductively connects the battery pack and the electronic control unit, the docking unit is plugged into the mounting base via the plug interface, and cooperates with the mounting base to form an installation space, and the electronic control unit is installed in the installation space.

[0012] Furthermore, the electronic control unit further includes a control circuit board, and the control circuit board and the power circuit board are stacked and arranged in the mounting base.

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

[0014] Furthermore, the docking unit includes a connecting seat and a conductive member provided on the connecting seat, the connecting seat is plug-connected to the bottom plate through the opening, and the conductive member connects the electronic control component and the battery pack;

[0015] Furthermore, the conductive part includes an electrically controlled conductive part and a power conductive part that are electrically connected. The power circuit board is provided with a conductive limiting part, which is electrically coordinated with the electrically controlled conductive part and limits the power circuit board.

[0016] Furthermore, the electric control component also includes a blocking unit connected to the wall panel to block the opening; the blocking unit is provided with a card slot that is slidably connected to the wall panels on both sides of the opening.

[0017] Furthermore, the mounting base further includes heat dissipation fins, which are arranged on a side of the base plate away from the electronic control unit, and heat dissipation channels are formed between the heat dissipation fins.

[0018] Furthermore, 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.

[0019] 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.

[0020] 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.

[0021] The beneficial effects of the present invention are as follows:

[0022] In the present invention, the docking unit, the electronic control unit and the mounting base are integrated 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

[0023] Figure 1It is a schematic diagram of the overall structure of the electric tool of the present invention;

[0024] Figure 2 yes Figure 1 The schematic diagram of the whole machine structure after removing the air inlet filter is shown;

[0025] Figure 3 yes Figure 2 A partial enlarged view of point A shown in FIG;

[0026] Figure 4 This is a schematic diagram of the structure of the whole machine after opening the main casing;

[0027] Figure 5 This is a schematic diagram of the structure of the whole machine after removing the battery pack and part of the main body casing;

[0028] Figure 6 This is a schematic diagram of the structure of the electronic control component of the present invention after assembly;

[0029] 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;

[0030] Figure 9 yes Figure 8 A structural diagram from another angle;

[0031] Figure 10 yes Figure 7 Exploded diagram of the electronic control components in the;

[0032] Figure 11 is a schematic diagram of the assembly of the mounting base and the docking unit of the present invention;

[0033] Figure 12 It is a structural schematic diagram of the mounting base of the present invention;

[0034] Figure 13 yes Figure 12 A top view of the mounting base shown in FIG;

[0035] Figure 14 yes Figure 12 a bottom view of the mounting base shown in ;

[0036] Figure 15 It is a structural schematic diagram of the docking unit of the present invention;

[0037] Figure 16 yes Figure 15 Main view of the middle docking unit;

[0038] Figure 17 yes Figure 15Right side view of the middle docking unit;

[0039] Figure 18 yes Figure 15 A top view of the middle docking unit;

[0040] Figure 19 Schematic diagram of the structure of the barrier unit of the present invention.

[0041] Description of reference numerals:

[0042] 100-main unit; 110-housing; 120-air inlet; 130-guide ribs; 140-air outlet; 150-displacement compensation unit; 160-filter;

[0043] 200-battery pack;

[0044] 300-motor; 310-fan; 320-switch assembly; 330-output assembly;

[0045] 400-Electronic control components;

[0046] 500 - electronic control unit; 510 - power circuit board; 511 - field effect transistor; 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;

[0047] 600 - mounting base; 610 - bottom plate; 611 - heat dissipation fins; 612 - heat dissipation channel; 620 - wall plate; 621 - guide fins; 622 - guide channel; 630 - opening;

[0048] 700 - docking unit; 710 - connection base; 711 - slot; 720 - conductive terminal; 730 - conductive plug;

[0049] 800-barrier unit; 810-chute;

[0050] 900-Glue filling cavity; 910-Sealing glue layer. DETAILED DESCRIPTION

[0051] 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 of the present invention, all other embodiments obtained by those skilled in the art without making creative work shall fall within the scope of protection of the present invention.

[0052] It should be noted that, in the description of the present invention, the terms “first”, “second” and “third” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0053] 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 .

[0054] 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 .

[0055] 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.

[0056] The output assembly 330 includes an output shaft and a tool accessory that cooperates with the output shaft. In this embodiment, the tool accessory includes a grinding disc (not shown in the figure).

[0057] See attached Figure 5 The embodiment of the present invention further includes an electronic control component 400 disposed in the housing 110, wherein the housing 110 includes left and right housings, and the electronic control component 400 is clamped between the limiting ribs of the left and right housings, and the left and right housings are fixed as a whole by screws after being clamped.

[0058] like Figure 5 and Figure 6 As shown, the electronic control component 400 in the embodiment of the present invention is used to connect the battery pack 200. At the same time, the electronic 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 entire machine.

[0059] The housing 110 of the embodiment of the present invention includes a front end, a handheld portion and a rear end, the motor 300, the fan 310 and the switch assembly 320 are arranged at the handheld 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.

[0060] like Figure 6 As shown, the electronic control assembly 400 of this embodiment of the present invention includes an electronic control unit 500, a mounting base 600, a docking unit 700, and a barrier unit 800. The docking unit 700 electrically connects the battery pack 200 and the electronic control unit 500. The mounting base 600 is provided with a mounting portion, and the docking unit 700 is connected to the mounting base 600 through the mounting portion to form an installation space, in which the electronic control unit 500 is installed.

[0061] See attached Figure 10 The electronic control unit 500 includes a power circuit board 510 and a control circuit board 520. The control circuit board 520 outputs control instructions to control the operation of the motor 300. The power circuit board 510 and the control circuit board 520 are electrically connected. Of course, as an alternative embodiment, the electronic control assembly 400 may also include only one circuit board, that is, the power circuit board and the control circuit board are combined into a single circuit board.

[0062] like Figure 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 the 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 placing 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.

[0063] 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.

[0064] 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. Therefore, 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.

[0065] like Figure 10As shown, the control circuit board 520 and the power circuit board 510 in the embodiment of the present invention are stacked and arranged in the mounting base 600. The control circuit board 520 and the power circuit board 510 are plug-connected by an electrical connector, wherein the electrical connector adopts a small board-to-board connector 570. The board-to-board connector 570 is provided with a number of small pin headers for conductive connection. Specifically, a number of female sockets are provided on one of the circuit boards, and a number of male plugs that are connected to the female sockets are provided on the other circuit board. In this way, the stacking arrangement of the power circuit board 510 and the control circuit board 520 can be realized. 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 panel 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.

[0066] 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, thereby avoiding failure and damage of electrical components caused by the control circuit board 520 applying force to the electrical components on the surface of the power circuit board 510.

[0067] The independent placement of the power circuit board and its close proximity to the mounting base ensures timely heat dissipation. Separately stacking the control circuit board and the power circuit board on the mounting base reduces the size of the board body and the bottom wall of the mounting base. This further reduces the size of the mounting base, contributing to a reduction in the overall size of the device. This also allows the electronic control assembly 400 to be mounted on the mounting base without increasing the overall size of the device's footrest. Furthermore, since the electronic control assembly is mounted within the housing's grip, the reduced size of the assembly also reduces the overall size of the grip, making it more convenient for the user to hold and providing a better user experience.

[0068] Furthermore, by directly plugging and fixing the control circuit board 520 to the power circuit board 510, the operation is simple and the difficulty is low, 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 for plugging in to further improve the reliability of the connection, and the convenient assembly is conducive to improving the production line capacity.

[0069] As an alternative embodiment, 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.

[0070] See attached Figure 8-10In this embodiment, a capacitor circuit board 560 is also provided that 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 this embodiment of the present invention, three capacitors 512 are soldered in parallel on the capacitor circuit board, and then the capacitor circuit board 560 is soldered to the power circuit board 510. The capacitor circuit board 560 is provided with a jack, and the power circuit board 510 is provided with a copper support column 514. During installation, the three capacitor patches are first soldered 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 soldered 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 entire machine, especially the size of the foot.

[0071] 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.

[0072] 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 through the opening 630.

[0073] By providing the opening 630 on the mounting base 600 , the docking unit 700 is plugged into the mounting base through the opening 630 , resulting in a simple structure and convenient assembly, thereby simplifying the assembly process while improving the integration level.

[0074] The mounting base 600 of the embodiment of the present invention further includes heat dissipation fins 611 and guide fins 621, wherein Figure 14 As shown, the heat dissipation fins 611 are provided 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 .

[0075] See attached Figure 12-14 In this embodiment, some of the heat dissipation fins 611 extend onto the wall plate 620 to form guide fins 621. Guide channels 622 are formed between the guide fins 621. The guide channels 622 communicate with the heat dissipation channels 612. External air flows through the air inlet 120 on the main housing 110 and into the guide channels 622, where it then flows into the heat dissipation channels 612.

[0076] The heat dissipating 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, and the heat dissipating fins 611 and the guide fins 621 are both integrally formed with the mounting base 600.

[0077] 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 and effectively 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.

[0078] Of course, as an alternative embodiment, all the heat dissipation fins 611 may be extended to the adjacent wall panels 620 to form guide fins 621 .

[0079] As another alternative embodiment, independent heat dissipation fins 611 and guide fins 621 may be provided on the bottom plate 610 and the wall plate 620 respectively, and it is only necessary that the guide channels generated by the guide fins are connected to the air inlet and the heat dissipation channel respectively.

[0080] 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. Therefore, 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.

[0081] 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.

[0082] like Figure 2-Figure 4 As shown, in this embodiment, a guide rib 130 is provided at the air inlet 120, wherein the guide fin 621 in the embodiment of the present invention is provided corresponding to the guide rib 130, so that the air inlet 120 is docked 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.

[0083] like Figure 15As shown, the docking unit 700 of the embodiment of the present invention includes several conductive parts and a connecting seat 710. The conductive parts are arranged on the connecting seat 710. Figure 11 , wherein the connecting base 710 is plugged into the bottom plate 610 of the mounting base 600 through the opening 630 .

[0084] 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 into the mounting base 600 along a surface direction parallel to the base plate 610, wherein the base plate 610 is inserted into 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 for the power circuit board 510 and the control circuit board 520.

[0085] The conductive member of this embodiment is conductively connected to the battery pack 200 and the electronic 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. Figure 15 and attached Figure 17 The electric control conductive parts are a plurality of conductive terminals 720 provided at one end of the connection base 710 and exposed outside the connection base 710. The conductive terminals 720 are used to conduct electricity with the electronic control unit 500. The power conductive parts are a plurality of conductive plugs 730 provided at the other end of the connection base 710 and exposed outside the connection base 710. The conductive plugs 730 are used to conduct electricity with the connection ports of the battery pack 200. Figure 11 When the connecting 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 .

[0086] When in use, insert the battery pack along the guide ribs of the host and connect it to the conductive terminal 720. Figure 5 As can be seen, because the conductive plug 730 of the electronic control assembly 400 in the embodiment of the present invention needs to be plugged into the battery pack, the control circuit board 520, power circuit board 510, and bottom plate 610 of the mounting base 600 of the present invention are generally parallel to the insertion and removal direction of the battery pack. Specifically, the rear end of the housing 110 includes a plugging and removal surface that plugs into and mates with the battery pack 200, and the power circuit board 510, control circuit board 520, and bottom plate 610 of the mounting base 600 are all arranged parallel to the plugging and removal surface. It is precisely because of this arrangement in the present application that the size of the power circuit board 510 is reduced, allowing the electronic control assembly 400 to be installed on the stand without increasing the size of the overall stand.

[0087] In this embodiment, the power circuit board 510 is further provided with a plurality of conductive limiters that are electrically matched with the conductive terminals 720 and limit the position of the power circuit board 510. Figure 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.

[0088] like Figure 10 As shown, during assembly, the power circuit board 510 is inserted axially through the conductive terminals 720 and secured to the bottom plate 610 of the mounting base 600 using screws 540. Two screws 540 are then passed through the control circuit board, the spacer 550, and the power circuit board 510 in sequence before being secured to the mounting base 600. The provision of the aforementioned connection holes 513 allows for automatic guidance and positioning of the power circuit board 510 during assembly, simplifying the assembly process for the power circuit board 510 and further improving production line productivity.

[0089] like Figure 7-10 As shown, the electric control assembly 400 in the embodiment of the present invention further includes a blocking unit 800, which is connected to the wall plate 620 to block the opening 630. Figure 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 enclose a glue filling cavity 900.

[0090] Specifically, see the attached Figure 9 and 19 The barrier unit 800 is provided with a slide groove 810 on each side. The barrier unit 800 slides and plugs into 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 the surface of the power circuit board 510. The electronic components located in the glue filling cavity 900 are then filled with glue to form a sealing glue layer 910. The sealing glue layer 910 encapsulates the exposed conductive pins of the components, thereby achieving a fixed seal for the electronic components. Epoxy resin is generally used as a sealant to achieve waterproof, dustproof, corrosion-resistant, sealed, and thermally conductive properties for the electrical components, thereby ensuring the mechanical strength of the entire device and preventing degradation of electrical performance. By providing a slide groove on the barrier unit that is slidably connected to the wall panels, the barrier unit and the wall panels are slidably connected, making the connection simple and assembly convenient, thereby simplifying the assembly process.

[0091] 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 portion of the housing 110, wherein the displacement compensation units 150 are provided at the contact portion between the inner wall of the housing 110 and the electronic control component 400. Figure 5The displacement compensation unit 150 can be an elastic washer or an elastic gasket. Since the conductive plug 730 is directly integrated into the electronic control component 400 in this embodiment, the connection between the conductive plug 730 and the battery pack 200 in this embodiment is a hard connection compared to a wire connection. Therefore, in order to prevent the conductive plug 730 from causing relative movement of the conductive plug 730 relative to the interface of the battery pack 200 due to vibration during use of the tool, thereby causing poor contact between the conductive plug 730 and the battery pack 200 or damage to the interface, the elastic displacement compensation unit 150 is provided to ensure elastic contact between the electronic control component 400 and the inner wall of the housing 110. When vibration occurs during use of the tool, the electronic control component 400 can generate a slight displacement compensation through the displacement compensation unit 150 to prevent 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.

[0092] 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.

[0093] In the present invention, the docking unit, the electronic control unit and the mounting base are integrated 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.

[0094] The assembly method of the electronic control assembly in the embodiment of the present invention is as follows:

[0095] (1) Assemble the docking unit and the mounting base to form the installation space for the electronic control unit, specifically:

[0096] The connecting base 710 of the docking unit 700 is plugged and fixed onto the bottom plate 610 of the mounting base 600 through 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 base 710; wherein the docking unit is plugged into the mounting base 600 along a direction parallel to the bottom plate 610 of the mounting base.

[0097] (2) Install the fixed electronic control unit in the installation space, specifically:

[0098] Insert the power circuit board 510 of the electronic control unit 500 along the conductive terminals 720 of the docking unit and secure it to the base plate 610 of the mounting base. The power circuit board 510 is mounted on the mounting base 600 perpendicular to the base plate 610 and then secured to the base plate 610 with screws 540.

[0099] Then, the control circuit board 520 of the electronic control unit is electrically connected to the power circuit board 510; specifically:

[0100] 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 .

[0101] (3) Covering the opening 630 of the mounting base 600, specifically:

[0102] 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 covered.

[0103] (4) Seal the electronic control unit, specifically:

[0104] Glue is poured into the glue filling cavity formed by the barrier unit 800 and the mounting base 600 to form a sealing glue layer 910 .

[0105] After the electronic control component 400 is assembled, the steps for installing the electronic control component 400 into the housing of the host 100 are as follows:

[0106] First, a predetermined number of displacement compensation units 150 are preset at positions where the inner wall of the housing 110 contacts the electronic control component 400 , for example, elastic washers or elastic gaskets are clamped in preset slots.

[0107] Then, the electronic control component 400 is installed in the left or 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.

[0108] Finally, snap the other half of the housing onto the above housing and secure it with screws.

[0109] The present invention provides an opening on the mounting base for allowing the docking unit to be inserted, so that 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 of 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.

[0110] 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 solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of the present invention.

Claims

1. An electric tool comprising: A host, comprising a housing, and a motor, a switch assembly, and an electric control assembly installed in the housing, wherein the electric control assembly is electrically connected to the switch assembly and the motor, respectively; a battery pack, detachably coupled to the host, having 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 electronic control component is arranged at the rear end of the housing; The electronic control component includes: An electronic control unit, the electronic control unit including a power circuit board, the power circuit board using a metal substrate; A mounting base, the power circuit board contacts the mounting base, the mounting base is provided with an insertion interface, and the mounting base is a metal base; and a docking unit, the docking unit conductively connecting the battery pack and the electronic control unit, the docking unit being plugged into the mounting base via the plug interface and cooperating with the mounting base to form an installation space, wherein the electronic control unit is installed in the installation space; The mounting base is provided with an opening, and the electric control component further comprises a blocking unit plugged into the opening to cover the opening.

2. The electric tool according to claim 1, wherein: The electronic control unit further includes a control circuit board, and the control circuit board and the power circuit board are stacked and arranged in the mounting base.

3. The electric tool according to claim 2, wherein: The mounting base includes 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, which constitutes the plug-in port.

4. The electric tool according to claim 3, wherein: The docking unit includes a connecting seat and a conductive member provided on the connecting seat. The connecting seat is plug-connected to the bottom plate through the opening. The conductive member connects the electronic control component and the battery pack.

5. The electric tool according to claim 4, wherein: The conductive parts include an electrically controlled conductive part and a power conductive part that are electrically connected. A conductive limiting part is provided on the power circuit board. The conductive limiting part is electrically coordinated with the electrically controlled conductive part and limits the power circuit board.

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

7. The electric tool according to claim 3, wherein: The mounting base further includes heat dissipation fins, which 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.

8. The electric tool according to claim 7, wherein: 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 communicated with the heat dissipation channels.

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

10. The electric tool according to claim 9, wherein: 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.

Images