CN201067879Y

CN201067879Y - Electric screwdriver

Info

Publication number: CN201067879Y
Application number: CNU2007200539968U
Authority: CN
Inventors: 吴亚定
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-07-11
Filing date: 2007-07-11
Publication date: 2008-06-04
Anticipated expiration: 2017-07-11

Abstract

An electric screw driver belongs to an electric tool and comprises an outer shell, a high voltage direct current motor, a planetary gear reducer, a torque regulator and a control circuit. The torque regulator comprises a box body, a mandril, a torque spring, a steel ball, a retaining top ring, a toque regulating sleeve and a main shaft. The wall of the box body is provided with six axial via holes, and six steel balls, six torque springs and six mandrels pass through each via hole in sequence. The front end face of the ring gear of the planetary gear reducer is provided with six triangular bumps and the front end face of the ring gear contacts the steel ball. The control circuit comprises an urban power supply plug, a protective tube, an indictor light, a bi-directional turned switch, a rectifier, a capacitor and a control button. The L pin and the N pin of the urban power supply plug are connected with the alternating current input end of the rectifier after being connected with the protective tube in parallel. The real output torque force of the utility model is more correct and the adjustment range of the torque is large. The outer shell has double insulating performance and is provided with an external fuse, so the electric screw driver is safe and reliable. Being provided with a high voltage direct current motor as the power, the electric screw driver can work just by directly being connected with 220 V urban power supply.

Description

Electric screw driver

Technical field

The utility model belongs to a kind of electric tool, mainly is that a kind of torsion that makes the actual output of electric screw driver comparatively accurately and not needs transformer can adopt civil power and can satisfy the electric screw driver of power demand.

Background technology

Market has all difficult accurately control of dissimilar electric screw drivers to bore the torsion of tight screw now, its reason was the main shaft and the torque controller planar friction of electric screw driver when the torsion of electric screw driver output produced error, because of frictional force causes outputting torsion not accurate enough greatly, can cause people to use the inconvenience of electric screw driver like this, and say with regard to the power supply aspect, the electric screw driver of market external variable-voltage power supply device and the low-voltage direct motors of adopting more, but it is because there is external variable-voltage power supply device, the physique that seems is big and heavy, brings to the user and uses the inconvenience that goes up and carry.

Summary of the invention

The purpose of this utility model is to provide a kind of outputting torsion adjustable range the big and direct insertion accurately electric screw driver of adjusting.

The utility model comprises shell, HVDC motor, planet wheel decelerator, torque controller and control circuit; Described torque controller has casing, push rod, moment spring, steel ball, retaining collar, torque adjusting cover and main shaft, the rear end of casing is a columniform cavity, 6 axial through holes are arranged on the tank wall of casing, through hole extends through cavity outside casing, there are 6 steel balls, 6 moment springs and 6 push rods to penetrate successively in each through hole, the neck of casing has external screw thread and spline groove, the retaining collar is enclosed within the neck of casing, torque adjusting is with internal thread, the external screw thread that the torque adjusting cover screws in the casing neck is pressed on the retaining collar, and the retaining collar is pressed on the push rod; Main shaft is installed in the casing by fore bearing and rear bearing, and the front end of main shaft has draw-in groove and collar, and the front end face of the ring gear of described planet wheel decelerator has 6 triangular bumps, and the front end face of ring gear contacts with steel ball; Described control circuit comprises the mains supply plug, protective tube, indicator lamp, forward-reverse switch, rectifier, filter condenser and control button, the L of mains supply plug, be connected to the ac input end of rectifier behind the N pin series connection protective tube, indicator lamp is attempted by the ac input end of rectifier, the dc output end of rectifier is connected to the fixed contact of polarity reversing switch, capacitor is attempted by the dc output end of rectifier, be connected to the HVDC motor behind the movable contact serial connection control button of polarity reversing switch, the fuselage of HVDC motor is connected to the grounding pin of mains supply plug.

As further improvement of the utility model, torque adjusting is with counterbore, and 10 locating holes are arranged on the retaining collar, between the counterbore of torque adjusting cover and the locating hole on the retaining collar positioning bead is arranged.

The utility model has disposed the safety clutch of being made up of 6 steel balls and ring gear in torque controller, frictional force is evenly distributed on ring gear, makes the torque adjustment scope of electric screw driver more more consistent with the adjustment setting value than the torsion that like product increases and reality is exported.

Description of drawings

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is the schematic diagram of the utility model embodiment;

Fig. 2 is the graph of a relation of HVDC motor, planet wheel decelerator and the torque controller of embodiment;

Fig. 3 is embodiment planet wheel decelerator rotation relation figure;

Fig. 4 is the electrical schematic diagram of embodiment.

The specific embodiment

Referring to Fig. 1～2, present embodiment comprises shell 1, HVDC motor 2, planet wheel decelerator 3 and torque controller 4; Torque controller 4 has casing 6, push rod 7, moment spring 8, steel ball 9, retaining collar 10, torque adjusting cover 11 and main shaft 12, the rear end of casing 6 is a columniform cavity, 6 axial through holes 13 are arranged on the tank wall of casing 6, through hole 13 extends through cavity outside

casing

6,6 steel balls 9 are arranged, 6

moment springs

8 and 6 push rods 7 penetrate in each through hole 13 successively, the neck of casing 6 has external screw thread and spline groove 14, retaining collar 10 is enclosed within the neck of casing 6, torque adjusting cover 11 has internal thread, the external screw thread that torque adjusting cover 11 screws in casing 6 necks is pressed on the retaining collar 10, retaining collar 10 is pressed on the push rod 7, torque adjusting is overlapped a counterbore (not shown) on 11 circumference, 10 locating holes 20 are arranged on the retaining collar 10, between the counterbore of torque adjusting cover 11 and the locating hole 20 on the retaining collar 10 1 positioning bead 19 is arranged; The front end face of the ring gear 17 of planet wheel decelerator 3 has 6 triangular bumps 18, and the front end face of ring gear 17 contacts with steel ball 9; Main shaft 12 is installed in the casing 6 by fore bearing and rear bearing, and the front end of main shaft 12 has two clamp bar slots 15, and main shaft 12 front ends are with a collar 16.Each parts is a front end near an end of batch mouth in the present embodiment, and each parts is the rear end away from an end of batch mouth.

During use shown in Fig. 2～3, during electric screw driver work, HVDC motor 2 gets electric rotation, and motor gear rotates gear, main shaft 12 and crowd mouth one And in the planet wheel decelerator 3, can reach the purpose that tightens the screw, this moment, the ring gear 17 of planet wheel decelerator 3 did not rotate; Behind screw tightening, main shaft 12 no longer rotates, and 3 of planet wheel decelerators rotate ring gear 17, and casing 6 interior steel balls 9 are beated on the triangular bump 18 of ring gear front end face, sheds most of load that motor bears.6 triangular bumps 18 that are configured in 6 steel balls 9 and ring gear 17 in the casing 6 are evenly distributed frictional force on ring gear, make the torsion of the actual output of electric screw driver comparatively accurate, can not produce error.The torque adjusting that can rotate about when regulating the output torque of criticizing mouth cover 11 is to increase and decrease the pressure of 8 pairs of 6 steel balls 9 of 6 moment springs, retaining collar 10 is stuck on the back stop slot of casing 6 necks during adjusting, can not follow moment regulating sleeve 11 and rotate, and the positioning bead 19 of torque adjusting device can be stuck in successively in 10 locating holes 20 of retaining collar 10 moment regulating sleeve 11 is fixed.

The draw-in groove 15 of present embodiment is suitable with the projection of batch mouth root, and when main shaft 12 rotated, crowd mouth one And rotated; Only need when batch mouth is installed that the projection of batch mouth root is aimed at draw-in groove 12 and push in and cross collar 16 and get final product, the projection that collar 16 blocks batch mouth makes to be criticized mouth and can not deviate from easily.

Referring to Fig. 4, control circuit 5 is by mains supply plug 21, protective tube 22, indicator lamp 23, forward-reverse switch 24, rectifier 25, capacitor 26 and control button 27 are formed, the L of mains supply plug, be connected to the ac input end of rectifier 25 behind the N pin series connection protective tube, indicator lamp 23 is attempted by the ac input end of rectifier 25, the dc output end of rectifier 25 is connected to the fixed contact 24 of forward-reverse switch 24, capacitor 26 is attempted by the dc output end of rectifier 25, be connected to HVDC motor 2 behind the movable contact serial connection control button 27 of forward-reverse switch 24, the fuselage of HVDC motor 2 is connected to the grounding pin of mains supply plug 21.25 rectifications become HVDC with capacitor 26 filtering transformations to electric main through rectifier, forward-reverse switch 24 converts high-voltage DC power supply to and adapts to the polarity that HVDC motor 2 turns to and be added to HVDC motor 2, and the start and stop of HVDC motor 2 are by control button 27 controls.

The shell of present embodiment is made of plastics, and has the double insulation performance and has the external failsafe silk, and is safe and reliable; Configuration HVDC motor 2 directly is inserted on the 220V mains supply and gets final product work as power, and HVDC motor 2 sides are furnished with radiator fan, makes the temperature of working continuously reduce durable.

Claims

1. electric screw driver, it comprises shell (1), HVDC motor (2), planet wheel decelerator (3), torque controller (4) and control circuit (5); It is characterized in that: described torque controller (4) has casing (6), push rod (7), moment spring (8), steel ball (9), retaining collar (10), torque adjusting cover (11) and main shaft (12), the rear end of casing (6) is a columniform cavity, 6 axial through holes (13) are arranged on the tank wall of casing (6), through hole (13) extends through cavity outside casing (6), 6 steel balls (9) are arranged, 6 moment springs (8) and 6 push rods (7) penetrate in each through hole (13) successively, the neck of casing (6) has external screw thread and spline groove (14), retaining collar (10) is enclosed within the neck of casing (6), torque adjusting cover (11) has internal thread, the external screw thread that torque adjusting cover (11) screws in casing (6) neck is pressed on the retaining collar (10), and retaining collar (10) is pressed on the push rod (7); Main shaft (12) is installed in the casing (6) by fore bearing and rear bearing, the front end of main shaft (12) has draw-in groove (15) and collar (16), the front end face of the ring gear (17) of described planet wheel decelerator (3) has 6 triangular bumps (18), and the front end face of ring gear (17) contacts with steel ball (9); Described control circuit (5) comprises mains supply plug (21), protective tube (22), indicator lamp (23), forward-reverse switch (24), rectifier (25), capacitor (26) and control button (27), the L of mains supply plug, be connected to the ac input end of rectifier (25) behind the N pin series connection protective tube, indicator lamp (23) is attempted by the ac input end of rectifier (25), the dc output end of rectifier (25) is connected to the fixed contact of forward-reverse switch (24), capacitor (26) is attempted by the dc output end of rectifier (25), be connected to HVDC motor (2) behind the movable contact serial connection control button (27) of forward-reverse switch (24), the fuselage of HVDC motor (2) is connected to the grounding pin of mains supply plug (21).

2. according to the described electric screw driver of claim 1, it is characterized in that: torque adjusting cover (11) has counterbore, 10 locating holes (20) are arranged on the retaining collar (10), between the locating hole (20) on the counterbore of torque adjusting cover (11) and the retaining collar (10) positioning bead (19) is arranged.