CN102225542A - Electric hammer drill having magnetic impact mechanism and effects of buffer and energy storage - Google Patents
Electric hammer drill having magnetic impact mechanism and effects of buffer and energy storage Download PDFInfo
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- CN102225542A CN102225542A CN2011101494541A CN201110149454A CN102225542A CN 102225542 A CN102225542 A CN 102225542A CN 2011101494541 A CN2011101494541 A CN 2011101494541A CN 201110149454 A CN201110149454 A CN 201110149454A CN 102225542 A CN102225542 A CN 102225542A
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Abstract
The invention discloses an electric hammer drill having a magnetic impact mechanism and the effects of buffer and energy storage, which comprises a housing, a motion transfer mechanism, the magnetic impact mechanism and a drill chuck. A guide sleeve of the magnetic impact mechanism is fixed inside the housing, the small end of an impact plate is installed in the guide sleeve and is also sleeved with a spring and then realizes connection via a limiting screw cap, the large end of the impact plate is positioned at the outer end face of the guide sleeve and is equipped with a ring-shaped permanent magnet; a driving plate is fixed inside the housing, the large end of the driving plate is coaxially equipped, at the position opposite to the impact plate, with another ring-shaped permanent magnet, the relative rotation between the ring-shaped permanent magnets on the driving plate and the impact plate generates repulsive force and attractive force alternatively, thus the impact plate performs axial reciprocating motion in relation to the driving plate and a motor drives the motion transfer mechanism. No contact is present between the ring-shaped permanent magnets, so the vibration noise is relatively small; and simultaneously, a spring, which is installed between the impact plate and the guide sleeve, can achieve the effects of buffer and energy storage.
Description
Technical field
The present invention relates to electric hand tool, especially relate to a kind of electric hammer with magnetic impacting mechanism and buffering accumulation of energy effect.
Background technology
It is a kind of electric hand tool that had not only rotated but also had impacted that electric hammer bores, and according to the mode difference that realizes impacting, the working method that traditional this type electric hammer bores can be divided into electric impact drill substantially, pneumatic type is impacted these three types of hammer drill, electromagnetic type impact hammer drills.As the patent No.: the pneumatic electric hammer among the CN200410014791.X bores, ballistic motion is to make by piston moving back and forth in cylinder to form air cushion between piston and the block stamp, make block stamp produce ballistic motion by positice ground effect, block stamp impact working head is realized.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.As the patent No.: the electric impact drill among the CN200410056338.5, when carrying out percussive drilling, need vertically be pressed onto on the working face drill bit, axially applying suitable pressure, moving impulse member will be given axial thrust of quiet impulse member when rotated and make it mobile backward this moment, when turning to the drop out of gear position, quiet impulse member moves the distance of a tooth depth backward, under the effect that adds axial force, quiet impulse member can promptly impact moving impulse member, produce strong wallop, circulation and so forth, electric impact drill just can produce lasting impact and rotatablely move.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.Electromagnetic type electric hammer, electric pick as the patent No.: CN200520095646.9 are power source with the solenoid, utilization is contained in the stretching of impact spring of hammer stem rear end and realizes, hammer stem moves backward and compresses spring when solenoid is switched on, when realizing ballistic motion under the reset response of hammer stem at spring after the outage.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.
In the last few years, along with the permanent-magnet material of a new generation in the raising of performances such as high remanent magnetism, high-coercive force, high magnetic accumulated energy and the reduction of cost, adopt the machine components of permanent magnet and product more and more.Compare with traditional drive technology, magnetic drives has many special advantages, and it is little, environment friendly and pollution-free or the like for example not have fretting wear problem, simple in structure, contactless transmission, noise vibrations.Being applied to can raise the efficiency in the electric tool product, can reducing noise, protection environment again, is the developing direction of a tool industrial prospect.
Summary of the invention
The object of the present invention is to provide a kind of electric hammer to bore with magnetic impacting mechanism and buffering accumulation of energy effect, this beater mechanism utilizes attraction that replaces and the repulsive force that relatively rotates between the annular permanent magnnet on impact disc and the driving-disc and form, realize the reciprocal ballistic motion of impact disc, not only can realize the impact and the spinfunction of electric hammer efficiently, and cushion the accumulation of energy function in addition.
The technical scheme that technical solution problem of the present invention is adopted is:
The present invention includes housing; By motor, be installed in the pinion of jackshaft one end, be installed in the idler gear and the gear wheel of the jackshaft other end, the driven wheel that is meshed with pinion, a travelling gear that is meshed with idler gear and an end are installed in the movement transferring that the turnbarrel in the driven wheel hole is formed; Beater mechanism and the drill chuck that is connected with the turnbarrel other end.In the described magnetic impacting mechanism, its pilot sleeve is fixed in housing one end, the small end that is arranged in the impact disc of turnbarrel is installed in pilot sleeve, the small end of impact disc is with spring and connects with limit screw cap, the big end of impact disc is positioned at the pilot sleeve outer face, and an annular permanent magnnet of circumferentially evenly arranging is installed; Driving-disc is fixed in the housing other end, coaxial another annular permanent magnnet of circumferentially evenly arranging that is equipped with in the position that the big end of driving-disc is relative with impact disc, relatively rotating between the annular permanent magnnet of installing respectively on driving-disc and the impact disc can alternately produce repulsive force and attraction, make impact disc do axial reciprocating motion with respect to driving-disc, the small end of driving-disc is equipped with travelling gear and by the gears engaged on idler gear and gear wheel and the armature axle.
Described two annular permanent magnnets be circumferentially evenly arrange and magnetic pole be along the circumferential direction be the N utmost point, the S utmost point is staggered; Or the monoblock annulus magnet N utmost point, S utmost point subregion magnetize, or are made up of the different N utmost points, S utmost point sector electromagnet; The N utmost point is what equate with the area size of the S utmost point, or unequal.
The cross section that the small end of described impact disc matches with the pilot sleeve pilot hole is square, rectangle, rhombus or triangle.
The present invention compares with background technology, and the beneficial effect that has is:
The present invention compares with traditional piston impact mechanism and grinding tooth beater mechanism, and is because ballistic motion is to realize by repulsive force and the attraction that produces between the permanent magnet, so this mechanism does not have special seal request, simple in structure; And owing to be not in contact with one another between the annular permanent magnnet, so vibration noise is all less; Simultaneously between impact disc and pilot sleeve, spring has been installed, can have been played the effect of buffering and accumulation of energy.
Description of drawings
Fig. 1 is a structural principle schematic diagram of the present invention;
Fig. 2 is the structural principle schematic diagram of magnetic impacting mechanism of the present invention;
Fig. 3 is Fig. 2 permanent magnet poles A-A distribution schematic diagram;
Fig. 4 is the structural representation of pilot sleeve;
Fig. 5 is the side view of Fig. 4.
Among the figure: 1, turnbarrel, 2, bearing, 3, limit screw cap, 4, driven wheel, 5, spring, 6, impact disc, 7, annular permanent magnnet, 8, annular permanent magnnet, 9, bearing, 10, driving-disc, 11, travelling gear, 12, bearing, 13, bearing, 14, supporting base, 15, motor, 16, bearing, 17, jackshaft, 18, gear wheel, 19, idler gear, 20, pilot sleeve, 21, bearing, 22, pinion, 23, housing, 24, drill chuck.
The specific embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
As shown in Figure 1 and Figure 2, the present invention includes housing 23; By motor 15, be installed in the pinion 22 of jackshaft 17 1 ends, be installed in the idler gear 19 and the gear wheel 18 of jackshaft 17 other ends, the driven wheel 4 that is meshed with pinion 22, a travelling gear 11 that is meshed with idler gear 19 and an end are installed in the movement transferring that the turnbarrel 1 in driven wheel 4 holes is formed; Beater mechanism and the drill chuck 24 that is connected with turnbarrel 1 other end; In the described movement transferring, turnbarrel 1 is fixed in the housing 23 by bearing 2, and jackshaft 17 is fixed in supporting base 14 and the housing 23 by bearing 16,21; In the described magnetic impacting mechanism, its pilot sleeve 20 is fixed in housing 23 1 ends, the small end that is arranged in the impact disc 6 of turnbarrel 1 is installed in pilot sleeve 20, the spring 5 that the small end of impact disc 6 has been with buffering accumulation of energy effect connects with limit screw cap 3 again, the big end of impact disc 6 is positioned at pilot sleeve 20 outer faces, and an annular permanent magnnet 7 of circumferentially evenly arranging is installed; Driving-disc 10 is by bearing 9, bearing 12 is fixed in housing 23 other ends, coaxial another annular permanent magnnet 8 of circumferentially evenly arranging that is equipped with in position that the big end of driving-disc 10 and impact disc 6 are relative, the annular permanent magnnet of installing respectively on driving-disc 10 and the impact disc 67, relatively rotating between 8 can alternately produce repulsive force and attraction, make impact disc 6 do axial reciprocating motion with respect to driving-disc 10, travelling gear 11 is housed the small end of driving-disc 10 and by the gears engaged on idler gear 19 and gear wheel 18 and motor 15 armature shafts, motor 15 armature shafts are fixed in the housing 23 by bearing 13.
As Fig. 2, shown in Figure 3, described two annular permanent magnnets the 7, the 8th, circumferentially evenly arrange and magnetic pole be along the circumferential direction be the N utmost point, the S utmost point is staggered; Or the monoblock annulus magnet N utmost point, S utmost point subregion magnetize, or are made up of the different N utmost points, S utmost point sector electromagnet; The N utmost point is what equate with the area size of the S utmost point, or unequal.
The cross section that the small end of described impact disc 6 matches with pilot sleeve 20 pilot holes is non-circular end faces such as square (as Fig. 4, shown in Figure 5), rectangle, rhombus or triangle, the radially rotation of restriction impact disc 20.
Operation principle of the present invention:
As shown in Figure 1, in the housing 23 of electric hammer motor 15 is housed, when motor 15 rotates, utilize the gear wheel 18 on its armature shaft front end gear driven jackshaft 17, gear wheel 18 all is fixed on the jackshaft 17 and with jackshaft 17 with pinion 22 and rotates, therefore, rotatablely move and to be delivered on the driven wheel 4 by pinion 22, driven wheel 4 is fixed on the turnbarrel 1, turnbarrel 1 is fixed in the housing 23 by bearing 2, can not move axially, so can only rotate relative to housing 23, its front end is equipped with drill chuck 24, when 1 rotation of driven wheel 4 driven rotary sleeves, can drive drill chuck 24 and rotate together, thereby drive the drill bit be installed in wherein (among the figure for drawing) rotation.
Simultaneously, because idler gear 19 all is fixed on the jackshaft 17 with gear wheel 18, when gear wheel 18 rotates, idler gear 19 also rotates thereupon together, idler gear 19 drives and drives travelling gear 11 rotations, because travelling gear 11 is fixed on the small end of driving-disc 10, the other end of driving-disc 10 is equipped with annular permanent magnet 8, when travelling gear 11 rotated, driving-disc 10 and the annular permanent magnet 8 that is fixed in the above also can be along with travelling gear 11 rotates together.Because annular permanent magnet 8 is N, the S utmost point is interspersed, in the impact disc 6 relative annular permanent magnnet 7 is housed with driving-disc 10, annular permanent magnnet 7 also is N, the S utmost point is interspersed, therefore, when annular permanent magnnet 7, when 8 polarity are identical, can produce repulsive force, annular permanent magnnet 7 when both sides, when 8 polarity are opposite, can produce attraction, because an end of 6 impact discs is installed in the pilot sleeve 20, impact disc 6 can not produce and rotatablely move, the reciprocating motion that can only carry out back and forth with respect to driving-disc 10, and pilot sleeve 20 has position-limiting action, the annular permanent magnnet 7 of both sides, 8 can not arrive together because magnetic force is excessive in adhesive, thereby can realize reciprocally drill hammer of impact disc 6, finally realize the hammering function that electric hammer bores.
When impact disc 6 is come in reciprocal ballistic motion, can make spring 5 compressions that are installed between limit screw cap 3 and the pilot sleeve 20 in the backhaul after impact process finishes, can avoid the impact in the Recovery Process too fierce like this, and can carry out accumulation of energy, for the impact in next process provides portion of energy.
The invention that is used for explaining of the above-mentioned specific embodiment, rather than limit the invention, in the protection domain of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.
Claims (3)
1. the electric hammer with magnetic impacting mechanism and buffering accumulation of energy effect bores, and comprises housing; By motor (15), be installed in the pinion (22) of jackshaft (17) one ends, be installed in the idler gear (19) and the gear wheel (18) of jackshaft (17) other end, the driven wheel (4) that is meshed with pinion (22), a travelling gear (11) that is meshed with idler gear (19) and an end are installed in the movement transferring that the turnbarrel (1) in driven wheel (4) hole is formed; Beater mechanism and the drill chuck (24) that is connected with turnbarrel (1) other end; It is characterized in that: in the described magnetic impacting mechanism, its pilot sleeve (20) is fixed in housing (23) one ends, the small end that is arranged in the impact disc (6) of turnbarrel (1) is installed in pilot sleeve (20), the small end of impact disc (6) is with spring (5) and uses limit screw cap (3) to connect again, the big end of impact disc (6) is positioned at pilot sleeve (20) outer face, and an annular permanent magnnet (7) of circumferentially evenly arranging is installed; Driving-disc (10) is fixed in housing (23) other end, coaxial another annular permanent magnnet (8) of circumferentially evenly arranging that is equipped with in the position that the big end of driving-disc (10) is relative with impact disc (6), the annular permanent magnnet of installing respectively on driving-disc (10) and the impact disc (6) (7, relatively rotating 8) can alternately produce repulsive force and attraction, make impact disc (6) do axial reciprocating motion with respect to driving-disc (10), the small end of driving-disc (10) is equipped with travelling gear (11) also by the gears engaged on idler gear (19) and gear wheel (18) and motor (15) armature shaft.
2. a kind of electric hammer with magnetic impacting mechanism and buffering accumulation of energy effect according to claim 1 bores, and it is characterized in that: described two annular permanent magnnets (7,8) be circumferentially evenly arrange and magnetic pole be along the circumferential direction be the N utmost point, the S utmost point is staggered; Or the monoblock annulus magnet N utmost point, S utmost point subregion magnetize, or are made up of the different N utmost points, S utmost point sector electromagnet; The N utmost point is what equate with the area size of the S utmost point, or unequal.
3. a kind of electric hammer with magnetic impacting mechanism and buffering accumulation of energy effect according to claim 1 bores, and it is characterized in that: the cross section that the small end of described impact disc (6) matches with pilot sleeve (20) pilot hole is square, rectangle, rhombus or triangle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101494541A CN102225542A (en) | 2011-06-02 | 2011-06-02 | Electric hammer drill having magnetic impact mechanism and effects of buffer and energy storage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101494541A CN102225542A (en) | 2011-06-02 | 2011-06-02 | Electric hammer drill having magnetic impact mechanism and effects of buffer and energy storage |
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| CN102225542A true CN102225542A (en) | 2011-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101494541A Pending CN102225542A (en) | 2011-06-02 | 2011-06-02 | Electric hammer drill having magnetic impact mechanism and effects of buffer and energy storage |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102490161A (en) * | 2011-12-14 | 2012-06-13 | 浙江大学 | Magnetic electric hammer drill capable of offsetting additional magnetic torque |
| CN103410433A (en) * | 2013-08-14 | 2013-11-27 | 镇江安达煤矿专用设备有限公司 | Spring type mechanical buffering and floating device of drilling rig |
| CN107914247A (en) * | 2017-12-18 | 2018-04-17 | 付国华 | A kind of electromagnetic type electric pick |
| CN109024211A (en) * | 2018-08-07 | 2018-12-18 | 刘大康 | A kind of road rehabilitation equipment |
| CN109024136A (en) * | 2018-08-07 | 2018-12-18 | 刘大康 | A kind of bituminous pavement restorative procedure |
| CN112356107A (en) * | 2020-10-14 | 2021-02-12 | 洪文琪 | Slicing device for traditional Chinese medicine decoction piece production and using method thereof |
| CN115844241A (en) * | 2022-12-12 | 2023-03-28 | 温州华侨职业中等专业学校(温州市华侨中学) | Frying strainer with temperature measuring function |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB589816A (en) * | 1944-10-04 | 1947-07-01 | Charles Cooper Seckham | New or improved magnetically-operated percussive tool |
| GB811175A (en) * | 1955-10-21 | 1959-04-02 | Sparcatron Ltd | Improvements in electromechanical high speed operating mechanism |
| JPS532769A (en) * | 1976-06-28 | 1978-01-11 | Jacquemet Georges | Electromagnetic impact device |
| US4353426A (en) * | 1979-08-17 | 1982-10-12 | Dobson Park Industries Limited | Percussive tools |
| CN2095076U (en) * | 1991-05-17 | 1992-02-05 | 薛逢春 | Electromagnetic percussive chisel |
| JPH0532769A (en) * | 1991-07-26 | 1993-02-09 | Toray Ind Inc | Thermoplastic polyester composition and production thereof |
| CN200981221Y (en) * | 2006-12-11 | 2007-11-28 | 刘春祥 | Magnetic air drill |
| CN201067893Y (en) * | 2007-07-27 | 2008-06-04 | 浙江大学 | Percussion drill with magnetic force percussion mechanism |
| CN201082539Y (en) * | 2007-07-27 | 2008-07-09 | 浙江大学 | Electric hammer with magnetic force impact mechanism |
| CN101708607A (en) * | 2009-12-03 | 2010-05-19 | 浙江大学 | Electric hammer drill with magnetic impact conversion mechanism |
| CN202079575U (en) * | 2011-06-02 | 2011-12-21 | 浙江大学 | Electric hammer drill with magnetic impaction mechanism and cushion energy storage function |
-
2011
- 2011-06-02 CN CN2011101494541A patent/CN102225542A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB589816A (en) * | 1944-10-04 | 1947-07-01 | Charles Cooper Seckham | New or improved magnetically-operated percussive tool |
| GB811175A (en) * | 1955-10-21 | 1959-04-02 | Sparcatron Ltd | Improvements in electromechanical high speed operating mechanism |
| JPS532769A (en) * | 1976-06-28 | 1978-01-11 | Jacquemet Georges | Electromagnetic impact device |
| US4353426A (en) * | 1979-08-17 | 1982-10-12 | Dobson Park Industries Limited | Percussive tools |
| CN2095076U (en) * | 1991-05-17 | 1992-02-05 | 薛逢春 | Electromagnetic percussive chisel |
| JPH0532769A (en) * | 1991-07-26 | 1993-02-09 | Toray Ind Inc | Thermoplastic polyester composition and production thereof |
| CN200981221Y (en) * | 2006-12-11 | 2007-11-28 | 刘春祥 | Magnetic air drill |
| CN201067893Y (en) * | 2007-07-27 | 2008-06-04 | 浙江大学 | Percussion drill with magnetic force percussion mechanism |
| CN201082539Y (en) * | 2007-07-27 | 2008-07-09 | 浙江大学 | Electric hammer with magnetic force impact mechanism |
| CN101708607A (en) * | 2009-12-03 | 2010-05-19 | 浙江大学 | Electric hammer drill with magnetic impact conversion mechanism |
| CN202079575U (en) * | 2011-06-02 | 2011-12-21 | 浙江大学 | Electric hammer drill with magnetic impaction mechanism and cushion energy storage function |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102490161A (en) * | 2011-12-14 | 2012-06-13 | 浙江大学 | Magnetic electric hammer drill capable of offsetting additional magnetic torque |
| CN102490161B (en) * | 2011-12-14 | 2013-11-20 | 浙江大学 | Magnetic electric hammer drill capable of offsetting additional magnetic torque |
| CN103410433A (en) * | 2013-08-14 | 2013-11-27 | 镇江安达煤矿专用设备有限公司 | Spring type mechanical buffering and floating device of drilling rig |
| CN107914247A (en) * | 2017-12-18 | 2018-04-17 | 付国华 | A kind of electromagnetic type electric pick |
| CN109024211A (en) * | 2018-08-07 | 2018-12-18 | 刘大康 | A kind of road rehabilitation equipment |
| CN109024136A (en) * | 2018-08-07 | 2018-12-18 | 刘大康 | A kind of bituminous pavement restorative procedure |
| CN109024136B (en) * | 2018-08-07 | 2020-09-25 | 上海时申工贸有限公司 | Asphalt pavement repairing method |
| CN109024211B (en) * | 2018-08-07 | 2020-10-13 | 南京天方市政工程有限公司 | Road repair equipment |
| CN112356107A (en) * | 2020-10-14 | 2021-02-12 | 洪文琪 | Slicing device for traditional Chinese medicine decoction piece production and using method thereof |
| CN115844241A (en) * | 2022-12-12 | 2023-03-28 | 温州华侨职业中等专业学校(温州市华侨中学) | Frying strainer with temperature measuring function |
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Application publication date: 20111026 |