CN201559178U - Electric hammer drill having magnetic force impact change-over mechanism - Google Patents

Abstract

The utility model discloses an electric hammer drill having a magnetic force impact change-over mechanism, which comprises a casing, a movement transferring mechanism and a magnetic force impact change-over mechanism, wherein, the magnetic force impact change-over mechanism is composed of a drive tray and an impact tray which are fixed by fixing sleeves, a permanent magnetic body is distributed in a base structure adjacent to the impact tray and the drive tray, when the drive tray rotates, the magnetic body distributed on the drive tray generates the repulsion force and the attractive force for the magnetic body on the impact tray to enable the impact tray to move forwards and backward relative to the drive tray. The electric hammer drill provided by the utility model can change the rotating movement of the motor into the reciprocating movement of the impact shaft, the utility model has advantages of high impact efficiency, long service life, simple structure, low manufacturing process requirement, low manufacturing cost and easy maintenance.

Description

Electric hammer with magnetic impact conversion mechanism bores

Technical field

The utility model relates to a kind of electric tool, particularly relates to a kind of electric hammer and bores.

Background technology

During electric hammer bores at present rotatablely moving of motor shaft become the reciprocating motion of impacting shaft, two kinds of forms of existing extensively employing: crank-linkage type and Oscillating lever bearing formula.The motor shaft of crank-linkage type mechanism is perpendicular to the impacting shaft axis; The employing that the Oscillating lever bearing formula has is rectilinear, the employing run-in index that has.

Crank connecting link switching mechanism is made up of motor shaft, gear, connecting rod, eccentric wheel etc.This mechanism's transfer process is the motor shaft driven wheel, and gear driven eccentric wheel, connecting rod, piston make its reciprocating motion of the pistons, produces the ballistic motion of power tool.Be characterized in simple in structure, efficient is high, and can utilize balance weight to reduce the electric hammer vibration in when work effectively.Its shortcoming is that appearance and size is big, and the electric hammer volume is strengthened, and seems comparatively heavy.

The switching mechanism of Oscillating lever bearing formula is made up of motor output shaft, gear, jackshaft, oscillation bearing, piston etc., the transfer process of this mechanism is the motor shaft driven wheel, the rotation of gear driven jackshaft, jackshaft drives the oscillation bearing swing, its terminal fork drives piston reciprocates, thereby produces the percussion action of power tool.The characteristics of this transition form are compact conformations, can reduce the weight and the appearance and size of electric hammer, and its shortcoming is to use the Vibration damping balance piece, thus the electric hammer driller to do time vibration big.

For the hand toolroom machine with impact driver, as instruments such as electric hammer brills, the working method of traditional this type electric hammer is as follows:

A kind of pneumatic electric hammer bores the patent No. for the ZL200410014791.X Chinese patent discloses, and its structure comprises that the hammer anvil that is arranged on of slip overlaps interior hammer anvil, transmission mechanism, cylinder, piston.Its operation principle is: it is based on impact that pneumatic electric hammer bores, rotate to be auxilliary electric hand tool, makes between piston and block stamp by the reciprocating motion of piston in cylinder to form air cushion, and owing to the ballistic motion that positice ground effect produces block stamp, block stamp impacts working head.But this structure of utilizing reciprocating motion of the pistons to produce impulsive force is had relatively high expectations to the sealing property of plunger shaft, and manufacturing cost is bigger, and can cause heating and energy loss because of friction, vibration and noise are also very big simultaneously, easy to wear, the life-span is short, and maintenance is inconvenient.

The patent No. discloses a kind of electric impact drill for the ZL200410056338.5 Chinese patent, and its structure comprises: impulse member, the two pairs of ratchets, transmission mechanism, spring.Its operation principle is: carry out percussive drilling, must make drill bit vertically be pressed onto on the scope of operation, and suitable pressure must applied axially, when rotating with auger spindle, the driven member with the auger spindle one will produce an axial thrust backward like this to the driving link that is fixed in the reduction box front end, move after making percussion drill, when moving impulse member goes to engaging tooth drop out of gear position, move the distance of a tooth depth behind the percussion drill, drop out of gear moment, owing to the axial compressive force that adds that continues, make quiet impulse member impact moving impulse member rapidly, thereby the scope of operation is produced strong wallop.Go round and begin again, just produced the compound motion that not only rotates but also impact that continues.But this structure of utilizing contrate tooth profile to mesh and producing impulsive force can cause heating and because of the friction energy loss, the profile of tooth wearing and tearing are severe, the life-span is short, and vibration and noise are all very big simultaneously.

Publication number is that the Chinese patent of CN2780416 discloses a kind of electromagnetic type electric hammer brill, and its structure comprises: solenoid, alter switch, hammer stem, impact spring, transmission mechanism.Its operation principle is: be power source with the solenoid, a kind of is at the circular shell leading portion straight-line guidance cover and active rotation cover to be housed, back segment is equipped with solenoid and is furnished with alter switch, hammer stem is housed in the housing, impact spring is equipped with in the rear end of hammer stem, when solenoid energising back pulling hammer stem backward and compress spring, behind coil blackout, under spring action, realize impact.This electric hammer that utilizes solenoid to produce impulsive force bores shortcoming and mainly is that power consumption is big, the coil life-span is short, breaks down easily, Electro Magnetic Compatibility is poor, especially realizes impacting and resetting by spring, and impulsive force is not high, frequency of impact is low, and spring lost efficacy easily and can't work on.This series products use that also really do not put goods on the market at present.

In recent years, because the permanent-magnet material of a new generation improves a lot on performances such as high remanent magnetism, high-coercive force, high energy product, its potential magnetic property is high, can pick up the weight that is equivalent to 640 times of own wts, and cost significantly reduces, and adopts the machine components of permanent magnet and product more and more.Magnetic drives has lot of advantages; there are not friction and wear problem; can high-speed motion; vibration and noise are less, and therefore, the permanent-magnet electric instrument can be raised the efficiency; can reduce noise again; the protection environment and can also make properties of product improve, and is one and is widely used and the developing direction of industrial prospect.

Summary of the invention

The utility model provides a kind of electric hammer to bore, the magnetic impact conversion mechanism that this electric hammer bores, can realize in the electric hammer brill rotatablely moving of motor being become the reciprocating motion of impacting shaft, be on the patent of invention basis of ZL200710070248.5, to improve to propose, realized the impact and the spinfunction of electric hammer.

A kind of electric hammer with magnetic impact conversion mechanism bores, comprise casing, movement transferring, the motor of power is provided, be provided with fixed muffle in the casing, fixed muffle is formed by connecting by fixed muffle front portion and fixed muffle rear threads, and wherein fixed muffle can be fixed in the leading portion casing by oneself decorative pattern on one's body.

Magnetic impact conversion mechanism is made up of the impact disc and the driving-disc that are arranged in the fixed muffle, impact disc is provided with jump bit, non-circular shaft, base from top to bottom successively, be provided with cylinder and round platform in the described base, be provided with magnet around the cylinder, the non-circular shaft of impact disc is enclosed within the guiding hole slot of fixed muffle front portion by the diameter of axle.Driving-disc comprises base and driving-disc axle, the base of driving-disc is relative with the impact disc base to be had in the shoulder hole that is fixed on the fixed muffle rear portion of certain interval, be provided with cylinder and round platform in the base of driving-disc, be provided with magnet around the cylinder, the driving-disc axle is equipped with gear and is connected with the motor output shaft gear.

Described movement transferring is made up of turnbarrel, turnbarrel gear wheel, turnbarrel bearing, shaft pinion, power transmission shaft sliding bearing, power transmission shaft, power transmission shaft gear wheel, described turnbarrel bearing is positioned at the rear inside wall of turnbarrel, by the turnbarrel bearing turnbarrel is fixed on the fixed muffle front portion; One end of described power transmission shaft is equipped with shaft pinion, shaft pinion and the turnbarrel gear wheel engagement that is installed in turnbarrel rear portion outer wall, power transmission shaft is provided with the power transmission shaft sliding bearing outward, the power transmission shaft other end is equipped with the power transmission shaft gear wheel and is connected transferring rotational motion with the motor output shaft gear.

The axis of driving-disc and impact disc is on same straight line, and two understructures are identical, base is arranged some to the fan-like pattern groove, be provided with the magnet that shape matches in each groove, magnet is the two poles of the earth permanent magnet, all arrange in pairs, dividing plate and the top board of fan-like pattern groove by base arranged at interval and formed, be some spaces to varying in size, the central angle of fan-like pattern groove is non-five equilibrium angle, wherein, the understructure that comprises dividing plate, top board, cylinder and round platform can be the foundry goods of global formation, and also each parts is assembled; Same magnet also is designed to the fan-like pattern structure, magnet after arranged evenly is an annular, adjacent paired magnet is respectively S, N utmost point arranged crosswise, the mutual rotation of two ring shape permanent magnets in impact disc and the driving-disc produces repulsive force and attraction, the driving impact disc is done with respect to driving-disc and is moved forward and backward, driving jump bit impacts mobile, very effective to the long-pending utilization of magnet surface in rotational motion like this, and dipolar in theory surface area ratio is asymmetric on same one side, help increasing repulsive force and reduce the suction-combining force, improve impact energy, guarantee to have enough the suction-combining forces.

Described turnbarrel is made up of shoulder hole in the plurality of sections and outer multidiameter, have through slot at the turnbarrel front end, with the adjoining turnbarrel inwall in through slot position pin is being arranged, be used for agreeing with drill bit, turnbarrel drives the drill chuck rotation that is connected with sleeve, thereby drives the drill bit rotation that is inserted in wherein.

Bulbous protrusion is arranged at the non-circular shaft top of described impact disc, is provided with the guiding hole slot in the fixed muffle front portion, the non-circular shaft of impact disc adopt cross section be irregular cylinders such as rhombus, rectangle, cydariform all can, with rotatablely moving of guiding hole slot engagement limits impact disc; Fixed muffle makes two bases to contact by the shoulder hole of inside, and by screw thread the different impulsive force effect of spacing distance acquisition is set, and spacing distance is provided with within the specific limits, has effectively prevented the leakage field effect of magnet.

Motion process is: gear on the driving-disc axle and the output shaft gear on the motor have been formed a gear reduction jointly, can make annular groove and magnet thereof increase moment of torsion simultaneously with the rotation of lower speed like this, driving-disc base upper groove inner magnet has been realized one than rotatablely moving under the high pulling torque effect thus.Impact disc can't rotate the anterior restriction of sleeve because direction of rotation is fixed, and magnet can only be realized seesawing like this.The fan-like pattern magnet of the correspondence on magnet on the impact disc base and the driving-disc base varies in size, it all is an end S utmost point, the one end N utmost point, this just makes repulsive force and attraction alternately produce, and with the one side on dipolar in theory surface area ratio asymmetric, so the generation repulsive force greater than attraction, the magnet on the driving-disc base can only rotate, magnet on the impact disc base is done and is seesawed, and the drive drill chuck that seesaws of impact disc is done ballistic motion.Turnbarrel drives the drill chuck rotation that is connected with sleeve, thereby drives the drill bit rotation that is inserted in wherein.The existing reciprocating motion of drill bit rotatablely moves again like this, has realized the hammer drill function of electric hammer.

The utility model is compared the beneficial effect that has with background technology: owing to adopted the permanent-magnet material of the high a new generation of magnetic property to do magnet, driving drill bit by attracting each other of producing of its mutually non-touching rotation and repulsive force seesaws, so impulsive force is to produce under unsealed state, therefore, this mechanism does not have special seal request, and is simple in structure; And owing to be not in contact with one another between two ring shape permanent magnets, therefore, can significantly reduce vibration and noise, the rotation of drill bit is simultaneously driven by other mechanism, so its drill efficient greatly improves the utility model thereby to have a life-span long, simple in structure, manufacture process requirement is low, and low cost of manufacture is keeped in repair advantages such as easy.

Description of drawings

Fig. 1 is that the electric hammer that magnetic impact conversion mechanism is housed of the present utility model bores structural representation;

Fig. 2 is a magnetic impact conversion mechanism schematic diagram of the present utility model;

Fig. 3 is the cutaway view of the A-A line among Fig. 2;

Fig. 4 is a fixed muffle structural representation of the present utility model;

Fig. 5 is an impact disc structural representation of the present utility model;

Fig. 6 is the vertical view of Fig. 5;

Fig. 7 is a turnbarrel structural representation of the present utility model;

Wherein: 1-turnbarrel, 2-turnbarrel gear wheel, 3-turnbarrel bearing, the 4-magnetic impact conversion mechanism, 5-driving-disc rolling bearing, 6-driving-disc sliding bearing, the 7-gear, 8-rear end cap, 9-motor, 10-power transmission shaft gear wheel, 11-power transmission shaft, 12-power transmission shaft sliding bearing, the 13-shaft pinion, 14-casing, 15-driving-disc axle, the 16-through slot, the 17-pin; 41-fixed muffle front portion, 42-fixed muffle rear portion, 43-driving-disc, 44-large size magnet, the small size magnet of 45-, 46-impact disc, 47-jump bit, the non-circular shaft of 48-, 49-base, 410-cylinder, 411-top board, 412-dividing plate, 413-screw thread, 414-round platform.

The specific embodiment

Referring to Fig. 1, the utility model comprises casing 14, motor 9, movement transferring, magnetic impact conversion mechanism 4.Described magnetic impact conversion mechanism 4 is made up of driving-disc 43 and impact disc 46;

Impact disc 46 is provided with jump bit 47, non-circular shaft 48, base 49 from top to bottom successively, and the non-circular shaft 48 of impact disc is enclosed within the guiding hole slot of fixed muffle front portion by the diameter of axle; Fixed muffle anterior 41 and fixed muffle rear portion 42 connect into fixed muffle by screw thread 413, and fixed muffle is fixed in the leading portion casing 14 by oneself screw thread on one's body;

Movement transferring is by turnbarrel 1, turnbarrel gear wheel 2, and turnbarrel bearing 3, shaft pinion 13, power transmission shaft slides and holds, power transmission shaft 11, power transmission shaft gear wheel 10 is formed;

Described turnbarrel bearing 3 is positioned at the rear inside wall of turnbarrel 1, by turnbarrel bearing 3 turnbarrel 1 is fixed on the fixed muffle front portion, one end of power transmission shaft 11 is equipped with shaft pinion 13, shaft pinion 13 and turnbarrel gear wheel 2 engagements that are installed in turnbarrel rear portion outer wall, the power transmission shaft 11 outer power transmission shaft sliding bearings 12 that are provided with, power transmission shaft 11 other ends are equipped with the power transmission shaft gear wheel and are connected transferring rotational motion with motor 9 output shaft gears.

Referring to Fig. 2, the non-circular shaft 48 of impact disc 46 by axle sleeve in the guiding hole slot of fixed muffle front portion 41, one end of impact disc 46 is equipped with jump bit 47, on axis one straight line of impact disc 46 and driving-disc 43, between shoulder hole structure qualification distance by the fixed muffle rear portion obtain different impulsive force effects, respectively be equipped with some in the base of impact disc 46 and driving-disc 43 to asymmetrical fan-like pattern permanent magnet 44,45, two magnet spacing distances are set within the specific limits, effectively prevented the leakage field effect of magnet, the mutual rotation of two fan-like pattern permanent magnets produces repulsive force and attraction, impact disc 46 is done with respect to driving-disc 43 moved forward and backward, drive jump bit and impact mobile.

Referring to Fig. 3, the two pairs of large size magnets 44 as shown in Figure 2 and the layout schematic diagram of small size magnet 45, be designed to fan-like pattern, the magnet of arrangement is an annular, and large size magnet 44 and small size magnet 45 are S, N utmost point arranged crosswise, be some spaces to varying in size, the central angle of fan-like pattern groove is non-five equilibrium angle, and dipolar in theory surface area ratio is asymmetric on same one side, helps increasing repulsive force like this and reduces the suction-combining force, very the high-energy utilization rate guarantees to have enough the suction-combining forces simultaneously.

Referring to Fig. 4, fixed muffle is connected to form by screw thread 413 by fixed muffle anterior 41 and fixed muffle rear portion 42 front and back two parts, and spacing distance can be regulated by screw thread 413, and the fixed muffle outer wall has decorative pattern to be used for fixedlying connected with casing 14; Fixed muffle front portion 41 has the guiding hole slot, can with the rotatablely moving of the diameter of axle engagement limits impact disc of impact disc 46.

Referring to Fig. 5, Fig. 6, the axle of impact disc be non-circular shaft 48, and the periphery of axle upper end has the jump bit 47 of bulbous protrusion, non-circular shaft 48 employing cross sections be irregular cylinders such as rhombus, rectangle, cydariform all can, to reach the effect that limits its rotation; Be provided with cylinder 410 and round platform 414 in the base 49 of impact disc, the base 49 of impact disc is provided with stationary barrier 412 and top board 411, the space that limits different sizes is to lay the magnet of different sizes, wherein, the understructure that comprises dividing plate, top board, cylinder and round platform can be the foundry goods of global formation, and also each parts is assembled.

Referring to Fig. 7, turnbarrel 1 is made up of shoulder hole in the plurality of sections and outer multidiameter, have the through slot 16 that is connected with outside drill chuck in turnbarrel 1 front portion, adjoining inner wall position at through slot has pin 17, be used for agreeing with drill bit, impact disc 46 diameters of axle are enclosed within the guiding hole slot of fixed muffle front portion 41, turnbarrel drives the drill chuck rotation that is connected with sleeve, thereby drive the drill bit rotation that is inserted in wherein, turnbarrel 1 rear inside wall is equipped with turnbarrel bearing 3, by it turnbarrel 1 is fixed on fixed muffle front portion 41.

The utility model operation principle is as follows: gear 8 and the output shaft gear on the motor on the driving-disc axle 15 have been formed a gear reduction jointly, make fan-like pattern groove and magnet thereof increase moment of torsion simultaneously with the rotation of lower speed, driving-disc 43 base upper groove inner magnets have been realized one than rotatablely moving under the high pulling torque effect thus.Impact disc 46 is anterior 41 restrictions of sleeve because direction of rotation is fixed, and annular magnet can only be realized seesawing like this.Magnet on magnet on impact disc 46 bases and driving-disc 43 bases all is an end S utmost point, the one end N utmost point, this just makes repulsive force and attraction alternately produce, and dipolar in theory surface area ratio is asymmetric on same one side, so the repulsive force that produces is greater than attraction, annular shape magnet on driving-disc 43 bases can only rotate, and the magnet on impact disc 46 bases is done and seesawed, and the drive drill chuck that seesaws of impact disc 46 is done ballistic motion.Turnbarrel 1 drives the drill chuck rotation that is connected with sleeve, thereby drives the drill bit rotation that is inserted in wherein.The existing reciprocating motion of drill bit rotatablely moves again like this, has realized the hammer drill function of electric hammer.

Claims (7)

1. the electric hammer with magnetic impact conversion mechanism bores, and comprises casing (14), movement transferring, magnetic impact conversion mechanism (4), the motor (9) of power is provided, and it is characterized in that:

Described casing is provided with fixed muffle in (14), and fixed muffle is formed by connecting by screw thread (413) by fixed muffle front portion (41) and fixed muffle rear portion (42);

Described magnetic impact conversion mechanism is made up of the impact disc (46) and the driving-disc (43) that are arranged in the fixed muffle, described impact disc (46) is made up of jump bit (47), non-circular shaft (48), base (49) from top to bottom successively, and base is provided with magnet in (49);

Described driving-disc (43) comprises base and driving-disc axle (15), the base of driving-disc is identical with the understructure of impact disc, be provided with in opposite directions, driving-disc axle (15) is fixed in the shoulder hole of fixed muffle rear portion (42) by driving-disc rolling bearing (5), and driving-disc axle (15) is equipped with the output shaft gear engagement of gear (7) and motor (9).

2. electric hammer according to claim 1 bores, it is characterized in that: described magnet is made of fan-like pattern large size magnet arranged in pairs (44) and small size magnet (45), paired large size magnet (44) and small size magnet (45) are respectively N, S utmost point arranged crosswise, somely the fan-like pattern magnet cartridge is combined into toroidal magnet arranges along cylinder in base fan-like pattern groove with matching;

Described fan-like pattern groove forms by the dividing plate (412) and top board (411) the interval layout of base, is some spaces to varying in size, and the central angle of fan-like pattern groove is non-five equilibrium angle.

3. electric hammer according to claim 1 bores, and it is characterized in that: the axis of described driving-disc (43) and impact disc (46) is on same straight line.

4. electric hammer according to claim 1 bores, and it is characterized in that: described fixed muffle front portion (41) is provided with the guiding hole slot, and the diameter of axle of the non-circular shaft (48) of impact disc (46) rotatablely moves with guiding hole slot engagement limits impact disc; The shoulder hole of fixed muffle by inside makes and keeps between two groups of magnets at interval that spacing distance can pass through screw thread (413) adjusting.

5. electric hammer according to claim 1 bores, and it is characterized in that: bulbous protrusion is arranged at non-circular shaft (48) top of described impact disc (46).

6. electric hammer according to claim 1 bores, it is characterized in that: described turnbarrel (1) is made up of shoulder hole in the plurality of sections and outer multidiameter, have through slot (16) at the turnbarrel front end, pin (17) being arranged, agree with drill bit with the adjoining turnbarrel inwall in through slot (16) position.

7. electric hammer according to claim 1 bores, it is characterized in that: described turnbarrel (1) rear portion outer wall assembling turnbarrel gear wheel (2), turnbarrel (1) rear inside wall is equipped with turnbarrel bearing (3), by turnbarrel bearing (3) turnbarrel (1) is fixed on the fixed muffle front portion (41).

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