CN103121120B

CN103121120B - Electric drill

Info

Publication number: CN103121120B
Application number: CN201310039636.2A
Authority: CN
Inventors: 张天石; 黄永林
Original assignee: Ningbo Hailian Electric Appliance Co ltd
Current assignee: Ningbo Hailian Electric Appliance Co ltd
Priority date: 2013-02-01
Filing date: 2013-02-01
Publication date: 2015-10-28
Anticipated expiration: 2033-02-01
Also published as: CN103121120A

Abstract

The invention discloses a kind of electric drill, it comprises power supply, speed-regulating switch (3) and motor (1), it also comprises main control wiring board (4) and can transmit control signal the torsion adjusting device (5) of the output current controlling main control wiring board (4), and power supply, main control wiring board (4), speed-regulating switch (3) and motor (1) are sequentially electrically connected.The present invention accurately can control max. output torque, the small volume of drill chuck.

Description

Electric drill

Technical field

The present invention relates to a kind of electric drill.

Background technology

The output torque of existing electric drill is overlapped by driving torque and regulates, torque sleeve is threaded with the internal gear with trip stop face by adjusting nut, Compress Spring, trip stop pad and steel ball is provided with successively between the trip stop face of adjusting nut and internal gear, concrete adjustment process is as follows: when driving torque overlaps, torque sleeve and adjusting nut just can oppress Compress Spring, the elastic force of Compress Spring acts on steel ball, to change the compression degree between steel ball and trip stop face, thus change the tripping force of this electric drill, to adjust the max. output torque of this electric drill.

This electric drill, because needs arrange torque sleeve, torque sleeve volume is comparatively large, makes the volume of electric drill comparatively large, uses inconvenience, and because torque sleeve is by Compress Spring adjustment output torque, and the elastic force of each Compress Spring is incomplete same, when making different electric drill be in same operation range, its tripping force has deviation, cause its max. output torque to produce deviation, the max. output torque of electric drill cannot accurately be controlled.

Summary of the invention

Technical problem to be solved by this invention is, provides and accurately can control the max. output torque of drill chuck, the electric drill of small volume.

For solving the problems of the technologies described above, electric drill provided by the invention, it comprises power supply, speed-regulating switch and motor, it also comprises main control wiring board and can transmit control signal the torsion adjusting device of the output current controlling main control wiring board, and power supply, main control wiring board and speed-regulating switch and motor are sequentially electrically connected;

Described torsion adjusting device comprises two exits, is connected with at least one resistance of adjustable total resistance value between two exits, and two exits are electrically connected with a current signal output end of main control wiring board and a current signal input respectively; Described resistance has multiple, described torsion adjusting device also comprises contact chip, an exit in two exits is connected multiple resistance successively, one end of each resistance is equipped with first contact, another exit in two exits is connected multiple second contact of arranging corresponding to the first contact successively, and contact chip movably connects each first contact and the second corresponding contact;

Described torsion adjusting device comprises bottom, cover plate, wiring board, rolling disc and sliding button, bottom and cover plate are interlocked, wiring board and rolling disc are placed between bottom and cover plate, the periphery of bottom is provided with to the axially extended coaming plate in cover plate direction, coaming plate is provided with breach, the periphery of rolling disc is provided with projection, sliding button to be movably located in breach and to be connected with projection, contact chip is installed on rolling disc, rolling disc is connected with ball stud by spring, ball stud and contact chip are located at the same face of rolling disc, wiring board is provided with multiple locating holes that the circumference that matches with ball stud distributes, multiple resistance, first contact and the second contact are all located on wiring board.

As preferably, described power supply is power brick.

After adopting above structure, the present invention compared with prior art, has following advantage:

Can by regulating the resistance value of torsion adjusting device, to change the output current of torsion adjusting device, main control wiring board is provided with master cpu, when master cpu detects the output current signal of torsion adjusting device, master cpu controls power brick and exports the corresponding electric current and voltage that pre-set to motor, thus the power output of the motor changed, to regulate the output torque of motor, thus change the max. output torque of drill chuck, this electric drill does not need to adopt torque sleeve, and have employed the power output that the mode sending the signal of telecommunication controls motor, not easily produce deviation, the accuracy controlled is higher, accurately can control the max. output torque of drill chuck, and this torsion adjusting device structure is simpler, size is less, make the size of this electric drill less, easy to use.

In addition, the resistance value of torsion adjusting device can be regulated by sliding button, when sliding button slides, ball stud moves between each locating hole, when sliding button moves into place, ball stud is limited in a locating hole, now contact chip makes the first contact and corresponding second contact conducting, the location facilitating contact chip is coordinated by ball stud and locating hole, make contact chip can accurately connect the first contact and the second corresponding contact, make contact chip position produce deviation, and drive turn disc by sliding button, easy to operate.

Accompanying drawing explanation

Fig. 1 is circuit theory diagrams of the present invention;

Fig. 2 is structural representation of the present invention;

Fig. 3 is the explosive view of torsion adjusting device of the present invention;

Fig. 4 is the structural representation of rolling disc of the present invention;

Fig. 5 is the structural representation of wiring board of the present invention.

Wherein, 1, motor; 2, power brick; 3, by-pass cock; 4, main control wiring board; 5, torsion adjusting device; 501, contact chip; 502, the first contact; 503, the second contact; 504, bottom; 505, cover plate; 506, wiring board; 507, rolling disc; 508, sliding button; 509, breach; 510, protruding; 511, spring; 512, ball stud; 513, locating hole; 514, buckle ear; 515, clasp; 516, coaming plate; 6, drill chuck.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the present invention is described in more detail.

By Fig. 1, shown in Fig. 2, electric drill of the present invention comprises motor 1, power brick 2, speed-regulating switch 3, main control wiring board 4 and torsion adjusting device 5, motor 1 output shaft drives drill chuck 6 to rotate by gearbox, power brick 2 is for powering for motor 1, power brick 2 comprises lithium battery group and protection circuit, main control wiring board 4 is provided with master cpu, the input of master cpu is electrically connected with the output of power brick 2, the output of master cpu is electrically connected with the input of speed-regulating switch 3, the output of speed-regulating switch 3 is electrically connected with the input of motor 1, speed-regulating switch 3 regulates the rotating speed of motor 1 by changing power frequency.

Power brick 2 also can replace by AC power, and AC power is connected to main control wiring board 4 by AC/DC changeover switch.

Torsion adjusting device 5 is provided with contact chip 501 and two exits, an exit in two exits is connected multiple resistance successively, one end of each resistance is equipped with first contact 502, another exit in two exits is connected multiple second contact 503 of arranging corresponding to the first contact 502 successively, two exits are electrically connected with an output of master cpu and an input respectively, contact chip 501 movably connects each first contact 502 and the second corresponding contact 503, that is when contact chip 501 connects first contact and corresponding second contact, torsion adjusting device 5 and master cpu form a current loop.

Torsion adjusting device 5 also can replace with the device of the adjustable resistor such as slide rheostat, potentiometer value.

By Fig. 3, Fig. 4, shown in Fig. 5, described torsion adjusting device 5 comprises bottom 504, cover plate 505, wiring board 506, rolling disc 507 and sliding button 508, the periphery of bottom 504 is provided with to the axially extended coaming plate 516 in cover plate 505 direction, coaming plate 516 is provided with multiple buckle ears 514 of circumference distribution, the periphery of cover plate 505 is provided with multiple clasps 515 coordinated with buckle ear 514 of circumference distribution, bottom 504 and cover plate 505 are interlocked by the cooperation of buckle ear 514 and clasp 515, wiring board 506 and rolling disc 507 are placed between bottom 504 and cover plate 505, coaming plate 508 is provided with breach 509, the periphery of rolling disc 507 is provided with protruding 510, sliding button 508 to be movably located in breach 509 and to be connected with protruding 510, that is rolling disc 507 can be rotated by mobile sliding button 508, when rolling disc 507 rotates, contact chip 501 moves between each group of the first contact 502 and the second contact 503 (the first contact 502 and corresponding second contact 503 are one group), contact chip 501 is installed on rolling disc 507, multiple resistance, first contact 502 and the second contact 503 are all located on wiring board 506.

Described rolling disc 507 is provided with spring 511 and ball stud 512, one end and the rolling disc 507 of spring 511 are fixed, the other end and the ball stud 512 of spring 511 are fixed, ball stud 512 and contact chip 501 are located at the same side of rolling disc 507, wiring board 506 is provided with multiple locating holes 513 that the circumference that matches with ball stud 512 distributes, when ball stud 512 skips to adjacent locating hole 513 by a locating hole 513, contact chip 501 skips to the first adjacent contact 502 and the second contact by one group of first contact 502 and the second contact 503, this just changes the resistance value of torsion adjusting device 5, thus change the output current of torsion adjusting device 5, making master cpu control power brick 2 according to the current signal received carries the electric current of corresponding size and voltage to motor 1, thus the power output of the motor 1 changed, to regulate the output torque of motor 1, thus change the max. output torque of drill chuck 6.

Claims

1. an electric drill, it comprises power supply, speed-regulating switch (3) and motor (1), it is characterized in that, it also comprises main control wiring board (4) and can transmit control signal the torsion adjusting device (5) of the output current controlling main control wiring board (4), and power supply, main control wiring board (4), speed-regulating switch (3) and motor (1) are sequentially electrically connected;

Described torsion adjusting device (5) comprises two exits, be connected with at least one resistance of adjustable total resistance value between two exits, two exits are electrically connected with a current signal output end of main control wiring board (4) and a current signal input respectively;

Described resistance has multiple, described torsion adjusting device (5) also comprises contact chip (501), an exit in two exits is connected multiple resistance successively, one end of each resistance is equipped with first contact (502), another exit in two exits is connected multiple second contact (503) of arranging corresponding to the first contact (502) successively, and contact chip (501) movably connects each first contact (502) and corresponding the second contact (503);

Described torsion adjusting device (5) comprises bottom (504), cover plate (505), wiring board (506), rolling disc (507) and sliding button (508), bottom (504) and cover plate (505) are interlocked, wiring board (506) and rolling disc (507) are placed between bottom (504) and cover plate (505), the periphery of bottom (504) is provided with to the axially extended coaming plate in cover plate (505) direction (516), coaming plate (516) is provided with breach (509), the periphery of rolling disc (507) is provided with projection (510), sliding button (508) to be movably located in breach (509) and to be connected with protruding (510), contact chip (501) is installed on rolling disc (507), rolling disc (507) is connected with ball stud (512) by spring (511), ball stud (512) and contact chip (501) are located at the same face of rolling disc (507), wiring board (506) is provided with multiple locating holes (513) that the circumference that matches with ball stud (512) distributes, multiple resistance, first contact (502) and the second contact (503) are all located on wiring board (506).

2. electric drill according to claim 1, is characterized in that: described power supply is power brick (2).