CN209633465U

CN209633465U - Electric hammer drill

Info

Publication number: CN209633465U
Application number: CN201920114328.4U
Authority: CN
Inventors: 林昌方
Original assignee: FANGDA HOLDING Co Ltd
Current assignee: FANGDA HOLDING Co Ltd
Priority date: 2019-01-23
Filing date: 2019-01-23
Publication date: 2019-11-15
Anticipated expiration: 2029-01-23

Abstract

The utility model provides a kind of electric hammer drill, it is related to field of drill, including drill body, drillstock, the rear end of drill, drill body is connect with drillstock, and the front end of drill body is arranged in drill, the surface of drill body is equipped with chip space, drill body forms corresponding blade along chip space, and chip space gradually becomes shallower as from distance outlet 3 centimeters of end margin to the groove depth of outlet end margin, and the angle between blade and drill body central axis is 135 ± 10 °；The front end of drill body is equipped with pedestal, and drill is welded on the base, and the center of drill is equipped with arc groove, is fixedly connected with anti-impact made of useful hard alloy in arc groove and taps the head, and anti-impact taps the head and stretches out the front end face of drill；The junction of drillstock and drill body is equipped with shield；Drillstock circumferential surface is equipped with symmetrical and equally distributed limiting slot and spline.The utility model can prevent the fracture of chip space exit, break flour is avoided to splash by shock resistance head protection drill, by shield, anti-fatigue ability is strong, high mechanical strength, operation safety.

Description

Electric hammer drill

Technical field

The utility model relates to field of drill, espespecially a kind of electric hammer drill.

Background technique

The electric hammer drill of the prior art generally welds carbide bit in drill body head, and in percussion drilling, hard is closed The blade of golden cutter head directly with the direct contact impact of materials such as cement concrete and stone material, if the materials such as cement concrete and stone material Contain harder impurity particle in material, under the impact of drill bit, it is easy to keep the blade generation notch of cutter head or even blade disconnected It splits, influences bore operation, therefore the electric hammer drill impact resistance of the prior art is poor.

Referring to Fig. 1, drill bit in the prior art, since the chip removal groove depth in drill body is consistent, chip space outlet is deposited In withdrawing step or sharp acute angles, so that the rod body split pole easy fracture at this, cutter life is shorter, and electric hammer drill is in warm There are biggish internal stress in treatment process, and are easy sharply to locate to generate stress concentration in step, angle etc., reduce drill bit Fatigue life, after a period of use be easy nearby break at first from helical flute root (helical flute outlet end) Split phenomenon.

And in operation process, the break flour of discharge can along drill bit rotation and splash everywhere, hurt operation sometimes The eyes of personnel.During prolonged cutting, the collet of electric hammer is easy to appear loosening, so that bit is influenced, or Drill bit drillstock during rotation moves axially.

Summary of the invention

To solve the above problems, the utility model, which provides one kind, can prevent the fracture of chip space exit, be resisted by increasing Head protection drill is impacted, break flour is avoided to splash by shield, anti-fatigue ability is strong, high mechanical strength, operation safety electric hammer Drill bit.

A kind of in order to achieve the above purposes, the technical solution adopted by the utility model is: electric hammer drill, including drill body, drillstock, The rear end of drill, the drill body is connect with drillstock, and the front end of drill body is arranged in the drill, and the circumferential surface of the drill body is equipped with The chip space extended spirally around drill body central axis, chip space form input end in the front end of drill body, and chip space is after drill body End forms outlet end, and drill body forms corresponding blade along chip space, and the chip space is from distance outlet 3 centimeters of end margin to out The groove depth of mouth end margin gradually becomes shallower as, so that chip space is shiny surface at outlet end, the chip space is flat dovetail groove, and Angle between blade and drill body central axis is 135 ± 10 °；The front end of the drill body is equipped with pedestal, and the drill is welded on On pedestal, the center of the drill is equipped with arc groove, is fixedly connected made of useful hard alloy and resists in the arc groove Impact head, and the anti-impact taps the head and stretches out the front end face of drill；The junction of the drillstock and drill body is equipped with shield, described Shielding cover is located at drillstock surface, and the opening of shield is towards drill body head；The drillstock circumferential surface is equipped with symmetrical and equal The limiting slot and spline of even distribution are equipped with the anti-feather key of outwardly convex in the limiting slot and spline.

Specifically, the center of the arc groove is equipped with blind hole, and the anti-impact, which is tapped the head, is equipped with connecting column corresponding with blind hole, Through connecting column close-fitting in blind hole, the anti-impact is tapped the head to be fixedly connected with the pedestal.

Specifically, the front end face that the anti-impact is tapped the head is equipped with clamping slot, the useful hard alloy system of welding in the clamping slot At blade.

Specifically, the shape of the blade is connected setting, the shape and blade shapes of the clamping slot with the shape of drill It is correspondingly arranged.

Specifically, the shield flare.

Specifically, the material of the shield is PMMA.

Specifically, the rear end face of the drillstock offers grid line, and grid line surface is sintered by high pressure high temperature There is polycrystalline diamond layer.

Specifically, the circumferential surface of the drill body is coated with nickel coating.

The utility model has the beneficial effects that:

1) in the utility model, chip space is gradually become shallower as from 3 centimeters apart from outlet end to outlet end, is gone out in chip space Mouthful end will not generate stress concentration in heat treatment process without withdrawing step trace and sharp acute angles near chip space outlet end, The loaded area near chip space outlet end is increased simultaneously, is improved the anti-fatigue ability of drill body, is made the service life of drill body Extend one times or more.Chip space is that the included angle of flat dovetail groove and blade and drill body central axis is 135 ± 10 °, from And avoid generating stress concentration because angle is too small, the fatigue life of drill body is improved, while reducing break flour and passing through chip removal The frictional resistance generated during slot with chip space, improves chip removal efficiency.

2) it in the utility model, is tapped the head front end setting anti-impact made of hard alloy in drill body, and shock resistance Head stretches out the front end face of drill, and when with materials such as boring of electric hammer, drill frequent impact cement concrete and stone materials, anti-impact is tapped the head The materials such as cement concrete and stone material are first contacted, this avoid drills directly to contact the materials such as cement concrete and stone material, has Drill is protected to effect not contained harder impurity particle collision cleft in the materials such as cement concrete and stone material or generate notch, because The electric hammer drill high mechanical strength, impact resistance of this utility model are good.

3) in the utility model, by increasing shield, in bore operation, the break flour that can effectively avoid splashing injures work The eyes of industry personnel, are conducive to operation safety.

Detailed description of the invention

Fig. 1 is the flute of drill structural schematic diagram of the prior art；

Fig. 2 is the overall structure diagram of the utility model embodiment；

Fig. 3 is the drill body diagrammatic cross-section of the utility model embodiment；

Fig. 4 is the drill partial structure diagram of the utility model embodiment.

Drawing reference numeral explanation: 1- drill body；2- drillstock；3- drill；4- chip space；5- blade；6- pedestal；7- anti-impact is tapped the head； 8- shield；11- withdrawing step；21- limiting slot；22- spline；The anti-feather key of 23-；24- polycrystalline diamond layer；31- arc is recessed Slot；32- blind hole；41- input end；The outlet end 42-；71- clamping slot；72- blade；73- connecting column.

Specific embodiment

Fig. 2-4 is please referred to, the utility model is about a kind of electric hammer drill, including drill body 1, drillstock 2, drill 3, the drill body 1 rear end is connect with drillstock 2, and the front end of drill body 1 is arranged in the drill 3, and the circumferential surface of the drill body 1 is equipped with around drill body 1 The chip space 4 that central axis extends spirally, chip space 4 form input end 41 in the front end of drill body 1, and chip space 4 is after drill body 1 End forms outlet end 42, and drill body 1 forms corresponding blade 5 along chip space 4, and the chip space 4 is from apart from 3 lis of 42 edge of outlet end Groove depth at rice to 42 edge of outlet end gradually becomes shallower as, so that chip space 4 is shiny surface, the chip space 4 at outlet end 42 For flat dovetail groove, and the angle between 1 central axis of blade 5 and drill body is 135 ± 10 °；The front end of the drill body 1 is equipped with base Seat 6, the drill 3 is welded on pedestal 6, and the center of the drill 3 is equipped with arc groove 31, is fixed in the arc groove 31 It connects anti-impact made of useful hard alloy and taps the head 7, and the anti-impact is tapped the head the front end face of 7 stretching drills 3；The drillstock 2 Shield 8 is equipped with the junction of drill body 1, and the shield 8 is set in 2 surface of drillstock, and the opening of shield 8 is towards drill body 1 front end；2 circumferential surface of drillstock is equipped with symmetrical and equally distributed limiting slot 21 and spline 22,21 He of limiting slot The anti-feather key 23 of outwardly convex is equipped in spline 22.

In the utility model, the front end refers to towards the direction that will pierce 3 position of drill in processing object, after described End refers to that direction will be by the direction at drillstock 2 position of the clamping in electric hammer, as it is well known in the art drill body 1 generally includes front end The drillstock 2 of drill 3 and rear end, drill 3 be for portalling to processing object drilling, drillstock 2 be for clamping in electric hammer.

In the utility model, chip space 4 is gradually become shallower as from 3 centimeters apart from outlet end 42 to outlet end 42, in chip removal 4 outlet end 42 of slot will not produce in heat treatment process near 4 outlet end 42 of chip space without 11 trace of withdrawing step and sharp acute angles Raw stress is concentrated, while increasing the loaded area near 4 outlet end 42 of chip space, is improved the anti-fatigue ability of drill body 1, is made The service life of drill body 1 extends one times or more.Chip space 4 is the angle of flat dovetail groove and blade 5 and 1 central axis of drill body Angle is 135 ± 10 °, to avoid generating stress concentration because angle is too small, improves the fatigue life of drill body 1, subtracts simultaneously Lack the frictional resistance that break flour generates during through chip space 4 with chip space 4, improves chip removal efficiency.

In the utility model, tapped the head 7, and shock resistance front end setting anti-impact made of hard alloy in drill body 1 First 7 stretch out the front end face of drill 3, when with materials such as boring of electric hammer, 3 frequent impact cement concrete of drill and stone materials, anti-impact Tap the head 7 first contact the materials such as cement concrete and stone material, this avoid drills 3 directly to contact the materials such as cement concrete and stone material Material is effectively protected drill 3 and is not contained harder impurity particle collision cleft or generation in the materials such as cement concrete and stone material Notch, therefore the electric hammer drill high mechanical strength of the utility model, impact resistance are good.

In the utility model, by increasing shield 8, in bore operation, the break flour that can effectively avoid splashing injures work The eyes of industry personnel, are conducive to operation safety.

In the utility model, drillstock 2 is equipped with symmetrical and equally distributed limiting slot 21 and spline 22, and limiting slot 21 With the anti-feather key 23 that outwardly convex is equipped in spline 22 so that the collet of drillstock 2 and electric hammer is able to carry out firm clamping It is fixed, so that drillstock 2 and collet are not in relative rotation or movement in operation process, guarantee operation quality.

Specifically, the center of the arc groove 31 is equipped with blind hole 32, and the anti-impact taps the head 7 equipped with corresponding with blind hole 32 Connecting column 73, through 73 close-fitting of connecting column in blind hole 32, the anti-impact is tapped the head 7 to be fixedly connected with the pedestal 6.

Anti-impact tap the head 7 installation when, the tap the head connecting column 73 of 7 connecting pins of anti-impact is a tight fit in the blind hole 32 of arc groove 31 Inside can be completed anti-impact tap the head 7 installation.

Specifically, tap the head 7 front end face of the anti-impact is equipped with clamping slot 71, and the useful hard of welding closes in the clamping slot 71 Blade 72 made of gold.

The blade 72 increase anti-impact tap the head 7 cutting power, therefore the electric hammer drill cutting speed of the utility model Fastly, drilling efficiency is high.

Specifically, the shape with the shape of drill 3 of the blade 72 are connected setting, the shape and blade of the clamping slot 71 72 shapes are correspondingly arranged.

Using the above scheme, it ensure that the consistency of blade 72 Yu 3 chip removal direction of drill, reduce the abrasion of drill 3.

Specifically, 8 flare of shield.

Specifically, the material of the shield 8 is PMMA.

Shield 8 is made into using transparent PMMA material, intuitively observes bore operation feelings through shield 8 convenient for operating personnel Condition.

Specifically, the rear end face of the drillstock 2 offers grid line, and grid line surface is sintered by high pressure high temperature There is polycrystalline diamond layer 24.

Drillstock 2 is made of hard alloy, keeps polycrystalline diamond compound well with hard alloy by grid line, The advantages of both comprehensive, the mechanical strength, wearability and resistance to percussion of drillstock 2 are improved, electric hammer can be born well Hammering.

Specifically, the circumferential surface of the drill body 1 is coated with nickel coating.

By being coated with nickel coating in the circumferential surface of drill body 1, the hardness and wearability of drill body 1 are improved, extending it makes Use the service life.

Embodiment of above is only that preferred embodiments of the present invention are described, not to the utility model Range be defined, under the premise of not departing from the spirit of the design of the utility model, this field ordinary engineering and technical personnel to this The various changes and improvements that the technical solution of utility model is made should all fall into the guarantor that claims of the utility model determine It protects in range.

Claims

1. a kind of electric hammer drill, including drill body, drillstock, the rear end of drill, the drill body are connect with drillstock, the drill setting exists The front end of drill body, the circumferential surface of the drill body are equipped with the chip space extended spirally around drill body central axis, and chip space is in drill body Front end form input end, chip space forms outlet end in the rear end of drill body, and drill body forms corresponding blade along chip space, special Sign is: the chip space gradually becomes shallower as from distance outlet 3 centimeters of end margin to the groove depth of outlet end margin, so that chip space It is shiny surface at outlet end, the chip space is flat dovetail groove, and the angle between blade and drill body central axis is 135 ±10°；The front end of the drill body is equipped with pedestal, and on the base, the center of the drill is equipped with arc groove for the drill welding, It is fixedly connected with anti-impact made of useful hard alloy in the arc groove to tap the head, and the anti-impact taps the head and stretches out the front end of drill Face；The junction of the drillstock and drill body is equipped with shield, and the shielding cover is located at drillstock surface, and the opening court of shield To drill body head；The drillstock circumferential surface is equipped with symmetrical and equally distributed limiting slot and spline, the limiting slot and flower The anti-feather key of outwardly convex is equipped in keyway.

2. electric hammer drill according to claim 1, it is characterised in that: the center of the arc groove is equipped with blind hole, described Anti-impact, which is tapped the head, is equipped with connecting column corresponding with blind hole, and through connecting column close-fitting in blind hole, the anti-impact is tapped the head and the pedestal It is fixedly connected.

3. electric hammer drill according to claim 1, it is characterised in that: the front end face that the anti-impact is tapped the head is equipped with clamping slot, Blade made of the useful hard alloy of welding in the clamping slot.

4. electric hammer drill according to claim 3, it is characterised in that: the shape of the blade is connected with the shape of drill to be set It sets, shape and the blade shapes of the clamping slot are correspondingly arranged.

5. electric hammer drill according to claim 1, it is characterised in that: the shield flare.

6. electric hammer drill according to claim 1, it is characterised in that: the material of the shield is PMMA.

7. electric hammer drill according to claim 1, it is characterised in that: the rear end face of the drillstock offers grid line, institute Stating grid line surface has polycrystalline diamond layer by high pressure high temperature sintering.

8. electric hammer drill according to claim 1, it is characterised in that: the circumferential surface of the drill body is coated with nickel coating.