CN211681921U - Electric tool - Google Patents

Abstract

The utility model discloses an electric tool, it includes: the host comprises a shell, and a motor, a switch assembly and an electric control assembly which are arranged in the shell, wherein the electric control assembly is electrically connected with the switch assembly and the motor respectively; the battery pack is detachably combined on the host machine and has a connection state of being conductive with the electric control assembly and a separation state of being disconnected with the electric control assembly; the electric control assembly comprises an electric control unit; the electric control unit comprises a control circuit board, a capacitor circuit board and a power circuit board, wherein the control circuit board and the capacitor circuit board are respectively arranged on the power circuit board in a stacked mode, and the projections of the capacitor circuit board and the control circuit board on the power circuit board are not crossed.

Description

Electric tool

Technical Field

The utility model relates to an electric tool technical field, concretely relates to electric tool.

Background

As the technology of the PCB assembly is developed, the application of the PCB assembly is more and more extensive, but the existing PCB assembly has the following problems: the control device and the power device are usually arranged on one PCB board at the same time, for example, the microcontroller, the MOS tube, the capacitor and other devices are attached to the same board, so that the occupied area of the PCB board is large, the PCB board can only be arranged in the machine shell along the extension direction of the host handle of the electric tool, the occupied space is large, the size of the machine body, the handle, the unfolding legs and other positions is not reduced, and the miniaturization and the refinement of the whole machine are not facilitated.

SUMMERY OF THE UTILITY MODEL

For solving the not enough of prior art, the utility model aims to provide an electric tool that validity is high, the integrated level is high, good heat dissipation.

In order to achieve the above object, the utility model adopts the following technical scheme:

a power tool, comprising:

the main machine comprises a shell, and a motor, a switch assembly and an electric control assembly which are arranged in the shell, wherein the electric control assembly is respectively electrically connected with the switch assembly and the motor, and comprises an electric control unit;

the battery pack is detachably combined on the host machine and has a connection state of being conductive with the electric control assembly and a separation state of being disconnected with the electric control assembly;

the electric control unit comprises a capacitor circuit board and a first circuit board, wherein the capacitor circuit board is arranged on the first circuit board in a laminated mode and is in conductive connection with the first circuit board.

Further, the capacitive circuit board patch is soldered to the first circuit board;

or, the first circuit board is provided with a conductive support column, and the capacitor circuit board is provided with a mounting hole suitable for being inserted into the support column.

Furthermore, the electronic control unit further comprises a second circuit board, the second circuit board is arranged on the first circuit board in a stacked mode, and projections of the capacitor circuit board and the second circuit board on the first circuit board are not crossed.

Furthermore, the first circuit board is a power circuit board, and the second circuit board is a control circuit board.

Further, the electronic control assembly further comprises: the control circuit board, the capacitor circuit board and the power circuit board are all arranged in the mounting base, and the power circuit board is in contact with the mounting base;

and the butt joint unit is in conductive connection with the battery pack and the electric control unit, the butt joint unit is connected with the mounting base in a matching way through the mounting part to form a mounting space, and the electric control unit is mounted in the mounting space.

Further, the mounting base comprises a bottom plate and a wall plate, wherein the wall plate is arranged along the edge of the bottom plate; the wall plate is provided with an opening, the opening forms the installation part, and the butt joint unit is spliced with the bottom plate through the opening.

Furthermore, the butt joint unit comprises a connecting seat and a conduction piece arranged on the connecting seat, the connecting seat is connected with the bottom plate in an inserting mode, the conduction piece comprises an electric control conduction piece and a power supply conduction piece which are in conductive connection, a conduction limiting piece is arranged on the power circuit board, and the conduction limiting piece is in conductive matching with the electric control conduction piece and limits the power circuit board.

Further, the electronic control assembly further comprises a blocking unit connected with the wall plate to block the opening.

Further, the mounting base further comprises radiating fins, the radiating fins are arranged on one side, deviating from the electric control unit, of the bottom plate, and radiating channels are formed among the radiating fins.

Furthermore, part or all of the radiating fins extend to the wall plate to form flow guide fins, flow guide channels are formed among the flow guide fins and are communicated with the radiating channels.

Furthermore, an air inlet and an air outlet are arranged on the machine shell, and a flow guide channel on the mounting base is in butt joint with the air inlet.

The utility model has the advantages as follows:

in the utility model, the capacitor plates are stacked on other circuit boards, and the stacking mode avoids laying elements with large occupied space or area on the same circuit board, and the size of the power circuit board is reduced due to the arrangement, so that the electric control assembly is allowed to be arranged at the unfolding feet on the basis of not increasing the size of the whole unfolding feet, and the structure is more compact; the functional requirements are met, the area of the board surface is reduced, the structure is more compact, and the miniaturization of the host is facilitated.

Meanwhile, the control circuit board and the capacitor circuit board are respectively overlapped, so that the size of the substrate of the power circuit board is further reduced, the occupied space is reduced, and the size of the whole machine is favorably reduced.

Drawings

Fig. 1 is a schematic view of the overall structure of the electric tool of the present invention;

FIG. 2 is a schematic view of the entire structure of FIG. 1 without the filter net at the air inlet;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic structural view of the whole device after the host machine case is opened;

FIG. 5 is a schematic structural view of the whole device with the battery pack and a portion of the main housing removed;

fig. 6 is a schematic structural view of the electric control assembly of the present invention after the assembly is completed;

FIG. 7 is a schematic view of the electronic control assembly of FIG. 6 after being encapsulated; FIG. 8 is a schematic view of the electronic control assembly of FIG. 6 with the connecting wires removed;

FIG. 9 is a schematic view of another angle of FIG. 8;

FIG. 10 is an exploded view of the electronic control assembly of FIG. 7;

fig. 11 is an assembly schematic of the mounting base and docking unit of the present invention;

fig. 12 is a schematic structural view of the mounting base of the present invention;

FIG. 13 is a top view of the mounting base shown in FIG. 12;

FIG. 14 is a bottom view of the mounting base shown in FIG. 12;

fig. 15 is a schematic structural view of the docking unit of the present invention;

FIG. 16 is a front view of the docking unit of FIG. 15;

FIG. 17 is a right side view of the docking unit of FIG. 15;

FIG. 18 is a top view of the docking unit of FIG. 15;

fig. 19 is a schematic structural diagram of the blocking unit of the present invention.

Description of reference numerals:

100-a host; 110-a housing; 120-air inlet; 130-guide ribs; 140-air outlet; 150-a displacement compensation unit; 160-a filter screen;

200-a battery pack;

300-a motor; 310-a fan; 320-a switch assembly; 330-an output component;

400-an electronic control assembly;

500-an electronic control unit; 510-a power circuit board; 511-field effect transistor; 512-capacitance; 513-connecting hole; 514-support column; 520-a control circuit board; 530-a wire; 540-screws; 550-an isolation column; 560-capacitive circuit board; 570-board to board connector;

600-mounting a base; 610-a backplane; 611-heat dissipation fins; 612-heat dissipation channels; 620-wall plate; 621-guide fin; 622-a flow guide channel; 630-an opening;

700-a docking unit; 710-a connection seat; 711-card slot; 720-conductive terminal; 730-a conductive patch;

800-a barrier unit; 810-a chute;

900-filling the glue cavity; 910-sealant layer.

Detailed Description

For the purpose of more clearly explaining the embodiments of the present invention, the technical solutions and advantages thereof are more clear, the following description will be made in conjunction with the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention, and all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present invention.

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 are not to be construed as indicating or implying relative importance.

As shown in fig. 1 and 2, the present invention provides an electric tool, in particular a hand-held electric angle grinder, which includes a main body 100 and a battery pack 200 detachably coupled to the main body 100.

As shown in fig. 5, the main body 100 of the embodiment of the present invention includes a casing 110, and a motor 300, a fan 310, a switch assembly 320, etc. disposed in the casing 110, wherein the motor 300 drives the fan 310 to rotate and provides power to an output assembly 330.

Referring to fig. 2 and 4, the housing 110 is provided with an inlet 120 and an outlet 140; wherein the fan 310 is used to generate and discharge an air flow out of the tool case 110, and the fan 310 is coaxially disposed with a motor shaft of the motor 300 to be rotated by the rotation of the motor 300. Further, referring to fig. 1, the angle grinder of the embodiment of the present invention further includes a detachable filter screen 160 outside the air inlet 120 to prevent external dust from entering.

The output assembly 330 includes an output shaft and a tool attachment cooperating therewith, the tool attachment in this embodiment including an abrasive disc (not shown in the figures).

Referring to fig. 5, the embodiment of the present invention further includes an electric control assembly 400 disposed in the casing 110, wherein the casing 110 includes left and right casings, the electric control assembly 400 is clamped between the limiting ribs of the left and right casings, and the left and right casings are fastened together by screws.

As shown in fig. 5 and fig. 6, the electronic control assembly 400 in the embodiment of the present invention is used for connecting the battery pack 200, and meanwhile, the electronic control assembly 400 is further electrically connected to the switch assembly 320 and the motor 300 through the conducting wire 530, and the switch assembly 320 controls the on/off of the motor 300 to control the operating state of the whole device.

The utility model discloses casing 110 includes preceding tip, handheld portion and back tip, and handheld portion is located to motor 300, fan 310 and switch module 320, and output assembly 330 locates preceding tip, and back tip is located to automatically controlled subassembly 400, and wherein the back tip is promptly for the exhibition foot department that angle grinder is connected with battery package 200.

As shown in fig. 6, the electronic control assembly 400 of the embodiment of the present invention includes an electronic control unit 500, a mounting base 600, a docking unit 700, and a blocking unit 800. The docking unit 700 is electrically connected with the battery pack 200 and the electronic control unit 500, an installation part is arranged on the installation base 600, the docking unit 700 is connected with the installation base 600 in a matching manner through the installation part to form an installation space, and the electronic control unit 500 is installed in the installation space.

Referring to fig. 10, the electronic control unit 500 includes a first circuit board, a second circuit board and a capacitor circuit board 560, wherein the first circuit board is a power circuit board 510, the second circuit board is a control circuit board 520, the control circuit board 520 outputs a control command to control the operation of the motor 300, and the power circuit board 510 is electrically connected to the control circuit board 520. Of course, as an alternative embodiment, the electronic control assembly 400 may include only one circuit board, that is, the power circuit board and the control circuit board are combined to be a single circuit board.

As shown in fig. 10, a field effect transistor 511 (MOS transistor) and a capacitor 512 are disposed on the power circuit board 510, wherein the field effect transistor 511 is used for controlling the on/off of the power supply and the motor 300 according to a control signal, the capacitor 512 is disposed near the field effect transistor 511 and is integrated with the field effect transistor 511 on the power circuit board 510, and the filtering performance of the capacitor 512 is improved by disposing the capacitor 512 near the field effect transistor 511 and the field effect transistor 511 on the same circuit board.

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

The power circuit board 510 in this embodiment is disposed close to or abutted against the mounting base 600, the power circuit board 510 is an aluminum substrate, one surface of the aluminum substrate is formed with a printed circuit and mounted with electronic components, the other surface of the aluminum substrate is a non-working surface, and the non-working surface and the mounting base 600 are mounted on the bottom plate 610 and contacted with the bottom plate 610.

As shown in fig. 10, 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, and similarly, the capacitor circuit board 560 and the power circuit board 510 are also stacked in the mounting base 600. Control circuit board 520 passes through electric connector plug connection with power circuit board 510, wherein electric connector adopts small-size board to the board connector, the board is equipped with the small-size pin header of a plurality of electrically conductive connections to the board in the board to the board connector, specifically, be equipped with a plurality of female seats on one of them circuit board, be equipped with a plurality of public plugs of being connected with the cooperation of female seat on another circuit board, can realize power circuit board 510 and control circuit board 520's range upon range of setting from this, the height of closing that the small-size board plugged together to the board connector does not exceed 4mm simultaneously, owing to close the height lower, can further reduce the height of wallboard 620 of mount base 600 on satisfying the solid requirement of encapsulating, the height dimension of mount base 600 has further been.

At least two spacing columns 550 are directly arranged on the control circuit board 520 and the power circuit board 510, and the spacing columns 550 are arranged on the control circuit board 520 and used for ensuring that the control circuit board 520 and the power circuit board 510 are spaced apart by a preset distance, so that the failure and damage of electric elements caused by the fact that the control circuit board 520 applies acting force to the electric elements on the surface of the power circuit board 510 are avoided.

The power circuit board is independently arranged and is arranged close to the mounting base, so that the timely heat dissipation of the power circuit board is ensured, and the control circuit board and the power circuit board are separately stacked on the mounting base, so that the sizes of the board body and the bottom wall of the mounting base are reduced; the size of the mounting base is further reduced, so that the size of the whole machine is reduced; the electric control assembly 400 can be arranged at the foot-expanding position on the basis of not increasing the size of the whole machine foot-expanding position. Meanwhile, the electric control assembly is arranged in the holding handle of the shell, so that the size of the whole holding handle is reduced due to the reduction of the size of the electric control assembly, the holding of a user is facilitated, and the user obtains better use experience.

Furthermore, the control circuit board 520 is directly inserted and fixed onto the power circuit board 510, so that the operation is simple and convenient, the difficulty is low, complex processes such as wire welding are omitted, the reliability of welding connection is low, the connection reliability is further improved by inserting the board-to-board connector, and the assembly is convenient, so that the production line capacity is improved.

As an alternative embodiment, the power circuit board and the control circuit board of the present invention may also adopt other connection methods, such as wire connection, and only the requirement of electrically connecting the two is satisfied.

Referring to fig. 8-10, in this embodiment, a capacitor circuit board 560 stacked on the power circuit board 510 is further provided, 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. The embodiment of the utility model provides a with three electric capacity 512 parallel welding on the electric capacity circuit board, weld electric capacity circuit board 560 and power circuit board 510 again, be equipped with the jack on the electric capacity circuit board 560, be equipped with copper support column 514 on the power circuit board 510, during the installation, weld the electric capacity circuit board with three electric capacity paster earlier on, insert the support column on the power board 510 with the jack on the electric capacity circuit board again on, pass through welded fastening at last. Through the arrangement of the capacitor circuit board, three capacitors are not directly mounted on the power circuit board 510, but are welded and fixed on the power circuit board 510 in a capacitor circuit board mode, so that the size of the power circuit board is effectively reduced, the size of the mounting base is reduced, the size reduction of the whole machine is facilitated, and particularly the size reduction of the foot unfolding position is facilitated.

Of course, the number of the capacitors is not limited to three, and the capacitors can be set according to specific requirements, and the capacitor circuit board can also be soldered on the control circuit board 520 by a patch soldering method.

The utility model discloses mounting base 600 dispels the heat to power circuit board 510 at least. As shown in fig. 11 to 13, the mounting base 600 includes a bottom plate 610 and a wall plate 620, the wall plate 620 is disposed along an edge of the bottom plate 610, an opening 630 is disposed on the wall plate 620, the opening 630 constitutes the mounting portion, and the docking unit 700 is connected to the mounting base 600 through the opening 630.

Through being provided with opening 630 on mounting base 600, will dock unit 700 from opening 630 and peg graft on mounting base, simple structure assembles the convenience, has simplified the equipment process flow on the basis of having improved the integrated level.

The mounting base 600 of the embodiment of the present invention further includes heat dissipating fins 611 and guiding fins 621, wherein as shown in fig. 14, the heat dissipating fins 611 are disposed on the bottom plate 610 on the side away from the electric control unit 500, and a heat dissipating channel 612 is formed between the heat dissipating fins 611.

Referring to fig. 12-14, in this embodiment, a portion of the heat dissipation fins 611 extends to the wall 620 to form flow guiding fins 621, flow guiding channels 622 are formed between the flow guiding fins 621, and the flow guiding channels 622 are communicated with the heat dissipation channels 612. The external air flow enters the diversion channel 622 through the air inlet 120 of the host housing 110, and then enters the heat dissipation channel 612 through the diversion channel.

Wherein the embodiment of the utility model provides an in radiating fin 611 and guide fin 621 be the rib that protrusion mounting base 600 set up, mounting base 600 in this embodiment is the aluminum material, radiating fin 611 and guide fin 621 be with mounting base 600 integrated into one piece.

The heat dissipation channel is formed by arranging the heat dissipation fins on the bottom plate in contact with the power circuit board, the heat dissipation effect and the heat dissipation efficiency are further improved, effective heat dissipation of the power element is achieved, and through the arrangement of the flow guide fins and the flow guide channel, external air flow can be effectively and smoothly guided into the tool in time, the circulation speed of air flow on the back of the mounting base is improved, the heat dissipation effect is improved, and the electrical performance of a circuit is ensured.

Of course, as an alternative embodiment, all the heat dissipation fins 611 may be extended to the adjacent wall plate 620 to form the flow guiding fins 621.

As another alternative, the bottom plate 610 and the wall plate 620 may be provided with independent heat dissipation fins 611 and independent flow guiding fins 621, respectively, only the flow guiding channel generated by the flow guiding fins is connected with the air inlet and the heat dissipation channel, respectively.

It should be noted that, while the guiding passage 622 guides the external airflow into the interior of the casing 110, the guiding passage 622 also takes away heat from the wall plate 620, so that the guiding passage 622 also plays a role of heat dissipation; in addition, the direction change positions of the heat dissipation fins 611 and the guide fins 621 are provided with arc-shaped transition sections, so that smooth flow of the air flow is facilitated.

The outlet direction of the heat dissipation channel 612 may be set along the direction of the heat dissipation airflow flow path in the housing 110, so as to guide the airflow in the heat dissipation channel 612 to smoothly move along the heat dissipation airflow flow path in the host 100, thereby avoiding the situation of blocking the heat dissipation airflow flow in the whole device due to different setting directions.

As shown in fig. 2-4, the air inlet 120 in this embodiment is provided with a guiding rib 130, wherein the guiding fin 621 in the embodiment of the present invention is disposed corresponding to the guiding rib 130, so that the air inlet 120 is abutted to the guiding channel 622, thereby ensuring that the external air can directly enter the guiding channel 622 through the air inlet 120, and rapidly enter the heat dissipating channel 612 through the guiding channel 622, so as to facilitate rapid and smooth circulation of the cooling air flow in the whole machine casing 110, thereby rapidly taking away the heat generated on the power circuit board 510, and improving the heat dissipating efficiency.

As shown in fig. 15, the docking unit 700 of the embodiment of the present invention includes a plurality of conductive members and a connecting seat 710, the conductive members are disposed on the connecting seat 710, see fig. 11, wherein the connecting seat 710 is inserted into the bottom plate 610 of the mounting base 600 through the opening 630.

As shown in fig. 15-18, in the present embodiment, a slot 711 adapted to the bottom plate 610 is disposed on the connection seat 710, the connection seat 710 is inserted onto the mounting base 600 along a direction parallel to the surface of the bottom plate 610, wherein the bottom plate 610 is inserted into the slot 711, and when the connection seat 710 is inserted into position relative to the mounting base 600, a space formed by the connection between the connection seat 710 and the mounting base 600 is a mounting space of the power circuit board 510 and the control circuit board 520.

The conducting member of the present embodiment is electrically connected to the battery pack 200 and the electronic control unit 500, wherein the conducting member includes an electronic control conducting member and a power conducting member, and the electronic control conducting member and the power conducting member are electrically connected to each other. Referring to fig. 15 and 17, the electrically conductive connecting elements are a plurality of electrically conductive terminals 720 disposed at one end of the connecting socket 710 and exposed outside the connecting socket 710, the electrically conductive terminals 720 are used for electrically conducting with the electrical control unit 500, the power connecting elements are a plurality of electrically conductive inserting pieces 730 disposed at the other end of the connecting socket 710 and exposed outside the connecting socket 710, and the electrically conductive inserting pieces 730 are used for electrically connecting with the connecting port of the battery pack 200. Referring to fig. 11, when the connecting socket 710 is assembled with the bottom plate 610 of the mounting base 600, the conductive terminals 720 and the conductive tabs 730 are respectively located at two sides of the bottom plate 610.

During the use, insert the battery package along host computer direction muscle and electrically conduct the switch-on with conductive terminal 720, see fig. 5 and can know, the embodiment of the utility model provides an automatically controlled subassembly 400 because its electrically conductive inserted sheet 730 need peg graft with the battery package, consequently the utility model discloses a bottom plate 610 of control circuit board 520, power circuit board 510 and mounting base 600 is roughly parallel to the plug direction of battery package, specifically, the rear end of casing 110 includes the plug face of pegging graft complex with battery package 200, and power circuit board 510, control circuit board 520 and mounting base 600's bottom plate 610 all sets up along being on a parallel with the plug face. Due to the above arrangement, the size of the power circuit board 510 can be reduced, which allows the electronic control assembly 400 to be mounted at the extending leg without increasing the size of the extending leg.

In this embodiment, the power circuit board 510 is further provided with a plurality of conduction limiting members electrically matched with the conductive terminals 720 and limiting the power circuit board 510, specifically, referring to fig. 10, the conduction limiting members are a plurality of connection holes 513 arranged on the power circuit board 510, wherein the power circuit board 510 is fixed and electrically connected with the conductive terminals 720 by welding after being butted with the conductive terminals 720 through the connection holes 513.

As shown in fig. 10, when assembling, the power circuit board 510 is fixed to the bottom plate 610 of the mounting base 600 by screws 540 after passing through the conductive terminals 720 along the axial direction, and the two screws 540 sequentially pass through the control circuit board, the spacing post 550 and the power circuit board 510 and then are fixed to the mounting base 600. Due to the arrangement of the connecting hole 513, automatic guiding and positioning of the power circuit board 510 during installation are achieved, the assembling operation flow of the power circuit board 510 is simplified, and the production capacity of a production line is further improved.

As shown in fig. 7-10, the electronic control assembly 400 of the embodiment of the present invention further includes a blocking unit 800, the blocking unit 800 is connected to the wall plate 620 to block the opening 630, where, referring to fig. 9, one end of the blocking unit 800 abuts against the power circuit board 510 and the connecting seat 710 after being assembled with the mounting base 600, and the other end is approximately flush with the ends of the wall plates 620 on two sides thereof, at this time, after the blocking unit 800 is assembled with the mounting base 600, the inner wall of the blocking unit 800, the wall plate of the mounting base 600, and the surface of the electronic control unit enclose to form the glue filling cavity 900.

Specifically, referring to fig. 9 and 19, the sliding grooves 810 are respectively disposed on two sides of the blocking unit 800, the blocking unit 800 is slidably inserted into the wall plates 620 on two sides of the opening 630 through the sliding grooves 810, during assembly, the blocking unit 800 is inserted in a direction parallel to the wall plates 620 and finally abuts against the surface of the power circuit board 510, then the electronic component located in the glue filling cavity 900 is subjected to glue filling operation to form a glue sealing layer 910, and the glue sealing layer 910 encapsulates the exposed conductive pins of the component, so as to achieve solid sealing of the electronic component, and generally, the epoxy resin is used as the sealing glue to achieve waterproof, dustproof, anticorrosion, sealing and heat conduction of the electrical component, thereby ensuring the mechanical strength of the whole machine and avoiding the reduction of the electrical performance. Through set up on the separation unit with wallboard sliding connection's spout, separation unit and wallboard sliding connection connect simple equipment convenience to the equipment technology can be simplified.

The embodiment of the present invention provides an inner wall at the rear end of the casing 110 is further provided with a plurality of displacement compensation units 150, wherein the displacement compensation units 150 are disposed at the contact position of the inner wall of the casing 110 and the electric control assembly 400, specifically, see fig. 5, the displacement compensation units 150 can be elastic washers or elastic gaskets, and the electric control assembly 400 in the embodiment is directly integrated with the conductive insertion piece 730. Compared with the wire connection, the connection between the conductive insert 730 and the battery pack 200 in this embodiment is a hard connection, so as to avoid the occurrence of a situation that the conductive insert 730 moves relatively to the interface of the battery pack 200 due to vibration during the use of the tool, thereby causing poor contact between the conductive insert 730 and the battery pack 200 or damage to the interface, by providing the elastic displacement compensation unit 150, the electronic control component 400 can be in elastic contact with the inner wall of the housing 110, and when the tool vibrates during the use of the tool, the electronic control component 400 can generate tiny displacement compensation through the displacement compensation unit 150, thereby preventing the conductive insert 730 from moving relatively to the interface of the battery pack 200, and further improving the service life of the tool and the user experience.

As an alternative embodiment, the electric control assembly of the present invention can also be applied to other hand-held electric tools, such as electric drills, screwdrivers, sanders, wrenches, polishing machines, gun drills, electric hammers, electric picks, etc. with the working current of 20A-45A and the maximum allowable working current of about 65A.

In the utility model, the butt joint unit, the electric control unit and the mounting base are integrated into a whole, the electric control assembly can realize the connection between the host and the power supply and the heat dissipation of the electric control unit, and the power supply is integrated with the electric conduction, the control and the heat dissipation, thereby further improving the integration level, reducing the occupied space and being beneficial to the reduction of the size of the whole machine; on the other hand, the technical scheme with strong universality and high adaptation degree is provided, and the method can be suitable for other similar tools.

The embodiment of the utility model provides an in automatically controlled subassembly the assembly method as follows:

(1) the equipment butt joint unit and the mounting base form the installation space of the electronic control unit, and specifically are:

inserting and fixing the connecting seat 710 of the docking unit 700 onto 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 slot 711 of the connecting seat 710; wherein the docking unit is docked with the mounting base 600 in a direction parallel to the mounting base floor 610.

(2) The electronic control unit is installed and fixed in the installation space, and specifically comprises the following steps:

inserting the power circuit board 510 of the electronic control unit 500 along the conductive terminals 720 of the docking unit and then fixing the power circuit board to the bottom plate 610 of the mounting base; the power circuit board 510 is mounted on the mounting base 600 along a direction perpendicular to the mounting base bottom plate 610, and is fixedly connected with the bottom plate 610 through a screw 540 after being mounted in place;

then, the control circuit board 520 of the electronic control unit is in conductive communication with the power circuit board 510; the method specifically comprises the following steps:

the male plug or female socket of the control circuit board 520 is inserted into the female socket or male plug of the power circuit board 510.

(3) The opening 630 of the mounting base 600 is shielded, specifically:

the blocking unit 800 is inserted into the sliding groove 810 of the blocking unit 800 along a direction perpendicular to the bottom plate 610, and the opening 630 is blocked after the blocking unit 800 and the wall plate 620 are inserted into position.

(4) The electronic control unit is sealed, and the method specifically comprises the following steps:

and performing glue pouring in a glue filling cavity formed by enclosing the blocking unit 800 and the mounting base 600 to form a glue sealing layer 910.

After the electronic control assembly 400 is assembled, the steps of mounting the electronic control assembly 400 into the chassis of the host 100 are as follows:

first, a predetermined number of displacement compensation units 150 are preset at a position where the inner wall of the housing 110 contacts the electronic control assembly 400, for example, an elastic washer or an elastic gasket is clamped in a preset clamping groove.

Then, the electric control assembly 400 is installed in the left casing or the right casing and fixed by a limiting rib on the inner wall of the casing, and an extension lead on the electric control assembly 400 is fixedly connected with the switch assembly 320 or the motor 300; the other components in the host 100 may be mounted in a manner similar to that of the prior art, which is not described herein.

And finally, the other half of the machine shell is clamped with the machine shell and is fixedly locked through the screw.

The utility model discloses a be equipped with on the mounting base and allow butt joint unit male opening, can accomplish the equipment of butt joint unit and mounting base through simple grafting, after the equipment is accomplished the power circuit board along conductive terminal penetrate fixed to the mounting base can, because the conductive terminal on the butt joint unit plays spacing and effect of direction to the installation of power circuit board promptly, consequently simplified the equipment degree of difficulty of power circuit board and improved the convenience and the accuracy of its operation, finally improved the packaging efficiency, the promotion of productivity has been realized.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (11)

1. An electric power tool characterized by comprising:

the main machine comprises a shell, and a motor, a switch assembly and an electric control assembly which are arranged in the shell, wherein the electric control assembly is respectively electrically connected with the switch assembly and the motor, and comprises an electric control unit;

the battery pack is detachably combined on the host machine and has a connection state of being conductive with the electric control assembly and a separation state of being disconnected with the electric control assembly;

the electric control unit comprises a capacitor circuit board and a first circuit board, wherein the capacitor circuit board is arranged on the first circuit board in a laminated mode and is in conductive connection with the first circuit board.

2. The power tool of claim 1, wherein: the capacitor circuit board patch is welded on the first circuit board;

or, the first circuit board is provided with a conductive support column, and the capacitor circuit board is provided with a mounting hole suitable for being inserted into the support column.

3. The electric power tool according to claim 1 or 2, characterized in that: the electronic control unit further comprises a second circuit board, the second circuit board is arranged on the first circuit board in a stacked mode, and projections of the capacitor circuit board and the second circuit board on the first circuit board are not crossed.

4. The power tool of claim 3, wherein: the first circuit board is a power circuit board, and the second circuit board is a control circuit board.

5. The power tool of claim 4, wherein the electronic control assembly further comprises: the control circuit board, the capacitor circuit board and the power circuit board are all arranged in the mounting base, and the power circuit board is in contact with the mounting base;

and the butt joint unit is in conductive connection with the battery pack and the electric control unit, the butt joint unit is connected with the mounting base in a matching way through the mounting part to form a mounting space, and the electric control unit is mounted in the mounting space.

6. The power tool of claim 5, wherein: the mounting base comprises a bottom plate and a wall plate, and the wall plate is arranged along the edge of the bottom plate; the wall plate is provided with an opening, the opening forms the installation part, and the butt joint unit is spliced with the bottom plate through the opening.

7. The power tool of claim 6, wherein: the butt joint unit comprises a connecting seat and a conduction piece arranged on the connecting seat, the connecting seat is connected with the bottom plate in an inserting mode, the conduction piece comprises an electric control conduction piece and a power supply conduction piece which are in conductive connection, a conduction limiting piece is arranged on the power circuit board, and the conduction limiting piece is in conductive matching with the electric control conduction piece and limits the power circuit board.

8. The power tool of claim 6, wherein: the electronic control assembly further comprises a blocking unit connected with the wall plate to block the opening.

9. The power tool according to any one of claims 6 to 8, wherein: the mounting base further comprises radiating fins, the radiating fins are arranged on one side, deviating from the electronic control unit, of the bottom plate, and radiating channels are formed among the radiating fins.

10. The power tool of claim 9, wherein: part or all of the radiating fins extend to the wall plate to form flow guide fins, flow guide channels are formed among the flow guide fins and are communicated with the radiating channels.

11. The power tool of claim 10, wherein: the casing is provided with an air inlet and an air outlet, and the flow guide channel on the mounting base is in butt joint with the air inlet.

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