DE202004015257U1 - Core drill with suction adaptor, has boring head with holes which are covered by suction inlet over entire rotation angle range of boring head - Google Patents

Abstract

The core drill includes a suction adaptor (20) with at least one suction inlet (26) and at least one suction outlet (27). In the entire rotation angle range of the boring head (1), the suction inlet covers a front hole (6) in the base of the boring head.

Description

The The invention relates to a coring machine with a drill bit, wherein the drill bit in its bottom facing away from the drill cutting edges at least having an end bore, which is the interior of the drill bit with the environment of the drill bit connects.

core drilling machines generate while drilling - ever after machined material - wood, Metal or rock dust. This obstructs the view on the one hand the drilling site and on the other part of the dust collects in the area of the processing station. The drilling process must therefore be interrupted regularly be to remove the dust. For this, the core drilling machine must be discontinued and set again after removing the dust become. This is time consuming and lowers the drilling performance of the core drilling machine.

Of the The present invention is therefore based on the problem To develop a core drilling machine with high drilling performance.

These Problem is solved with the features of the main claim. To the core drilling machine has a suction adapter with at least one suction and at least one suction opening on. The suction port covers the End hole in the entire rotation angle range of the drill bit.

Further Details of the invention will become apparent from the dependent claims and the following description of a schematically illustrated embodiment.

1 : Partial longitudinal section through a core drilling machine with adapted drill bit and suction adapter;

2 : Front view of the machine housing;

3 : Longitudinal section of a suction adapter with attached cover;

4 : Front view of 3 ;

5 : Longitudinal section of a suction adapter with sliding closure lid;

6 : Front view of a suction adapter with removed cover;

7 : Front view of a suction adapter with a film hinge;

8th : Longitudinal section through a suction adapter with form-fitting connected hose adapter;

9 : Top view of a removed hose adapter behind 8th ;

10 : View of the suction adapter off 8th from underneath;

11 : Side view of the suction adapter off 8th from the suction side;

12 : Cover of the suction adapter after 8th ,

The 1 shows the front part of an example hand-held core drilling machine. The core drill carries with its main shaft ( 70 ) a drill bit ( 1 ) and a centering bolt ( 10 ). From the core drilling machine here are three parts ( 61 - 63 ) of the machine housing ( 60 ) and the gearbox mounted therein ( 81 . 98 . 99 . 112 ) with the shafts and gears.

The main shaft ( 70 ) is driven for example via a gear transmission by an electric motor. From the electric motor, whose unillustrated rotor and stator from a stator housing ( 63 ), only the front engine shaft end ( 111 ), the front bearing ( 113 ) and the fan wheel ( 114 ) to recognize.

The motor shaft end ( 111 ) is eg central in the intermediate housing ( 62 ) stored. The flange-like intermediate housing ( 62 ), the engine-side centered on the stator housing ( 63 ), has a stepped through hole ( 64 ). In this hole ( 64 ), for example, the front engine mount ( 113 ) and a shaft seal ( 115 ). Between the front engine mounts ( 113 ) and the rotor, not shown, the fan wheel ( 114 ) on a serration. The free end of the motor shaft end ( 111 ) is used as a drive pinion ( 112 ) designed.

This drive pinion ( 112 ) combs with a on a side wave ( 90 ) arranged Kuppelrad ( 98 ) a slip clutch. The number of teeth ratio between the drive pinion ( 112 ) and the Kuppelrad ( 98 ) is eg 1: 5. The dome wheel ( 98 ) is on the Nebenwelle ( 90 ) radially via a sliding ring ( 92 ) stored. Axial is the Kuppelrad ( 98 ) via a sliding disk ( 93 ) on a support flange ( 91 ) of the secondary wave ( 90 ) at. Against this support flange ( 91 ) the coupling wheel ( 98 ) by means of a rotation on the secondary shaft ( 90 ) mounted friction lining ( 94 ) via a plate spring ( 95 ) pressed. The plate spring ( 95 ) is based on one on the secondary wave ( 90 ) sitting mother ( 96 ).

Next to the support flange ( 91 ) is located on the side wave ( 90 ) a second gear ( 99 ). This meshes with one on the main shaft ( 70 ) arranged output wheel ( 81 ). The transmission ratio between the second Nebenwellenrad ( 99 ) and the driven wheel ( 81 ) is for example 13:19.

The secondary wave ( 90 ) is radially from the transmission housing ( 61 ) surround. This is about a housing collar ( 65 ) and a dowel pin ( 66 ) on the intermediate housing ( 62 centered). The housing parts ( 61 - 63 ) are over several screws ( 67 ) connected with each other. The secondary wave ( 90 ) is motor-side in a needle bearing ( 102 ) and Bohrkronenseitig in a deep groove ball bearing ( 101 ) stored. The seat of the needle bearing ( 102 ) lies in the intermediate housing ( 62 ), while the seat of the deep groove ball bearing ( 101 ) in the transmission housing ( 61 ) is arranged.

The main shaft ( 70 ) is a multi-stepped shaft with a central blind hole ( 71 ). It is motor-side in a needle bearing ( 84 ) in the intermediate housing ( 62 ) stored. Bohrkronenseitig it supports by means of a grooved ball or shoulder bearing ( 83 ) in the transmission housing ( 61 ) ia on a housing collar ( 68 ). At this housing collar ( 68 ), it is for example a labyrinth seal ( 86 ) and a retaining ring ( 69 ) held. In the rear area of the main shaft ( 70 ) is a shaft collar ( 74 ) with an upstream longitudinal groove ( 75 ) for receiving a feather key ( 82 ). In this area sits the output gear ( 81 ). As shaft-hub connection, the feather key ( 82 ). Axial is the driven wheel ( 81 ) between the shaft collar ( 74 ) and a retaining ring ( 69 ) fixed.

Between the output gear ( 81 ) and the front deep groove ball bearing ( 83 ) sits on the main shaft ( 70 ) sliding shaft seal ( 85 ) in the transmission housing ( 61 ). The latter, together with the intermediate housing ( 62 ) seated shaft seal ( 115 ) an inadmissible leakage of the gear lubricant.

In the transmission, the main ( 70 ), Next- ( 90 ) and the motor shaft ( 111 ), for example, aligned parallel to each other. The gears used are in pairs, for example, straight, diagonally or arrow-toothed.

In the main shaft ( 70 ) is a drill bit adapter ( 50 ), for example by means of a thread ( 54 screwed in). This drill bit adapter ( 50 ) has a central bore ( 51 ), in which the centering bolt ( 10 ) is guided. The latter is, for example, by a compressed gas filling the blind hole ( 71 ) held in the extended position. A beading ( 16 ) prevents the centering pin from being pushed out ( 10 ).

The drill bit adapter ( 50 ) has a second external thread ( 53 ), which in the in the 1 shown screwed drill bit adapter ( 50 ) from the main shaft ( 70 ) stands out. On this external thread ( 53 ) the drill bit ( 1 ) screwed. The drill bit ( 1 ) has in the embodiment for this at least two flats ( 9 ) for attaching an open-end wrench. For countering, another open-end wrench is used on hexagon flats ( 76 ) of the main shaft ( 70 ) withheld. As a plan stop here serves the face ( 73 ) of the main shaft ( 70 ).

In 1 carries the receiving adapter ( 50 ), for example, a dry core bit ( 1 ). The dry core bit ( 1 ) consists of a drill pot ( 2 ), in whose bottom ( 3 ) for attachment to the main shaft ( 70 ) a female thread flange ( 4 ), and for example four diamond segments ( 5 ), which are axially fixed to the free Bohrkronentopfrand. The diamond segments ( 5 ) are the drill bits of the core drilling tool ( 1 ). In the ground ( 3 ) are two or more end bores ( 6 ) around the internal thread flange ( 4 ) arranged around.

Between the dry core bit ( 1 ) and the transmission housing ( 61 ) is a tubular suction adapter ( 20 ) detachably installed. The suction adapter ( 20 ) surrounds the main shaft in certain areas ( 70 ) and the drill bit adapter ( 50 ). It comprises a basic body ( 21 ), a hose connection ( 23 ) and a closure lid ( 22 ). The basic body ( 21 ) sits at least partially positively on the front edge of the transmission housing ( 61 ). He is there with the help of his partially encompassing clamp ( 49 ) of the handle ( 48 ) non-slip fixed. Between the suction adapter ( 20 ) and the ground ( 3 ) of the dry core bit ( 1 ) there is an annular gap ( 8th ) with a length of about 0.3 to 0.5 millimeters.

For positive connection with the transmission housing ( 61 ), the basic body ( 21 ), for example, three centripetally oriented, arranged on a common pitch noses ( 24 ), which are in a groove ( 87 ) of the transmission housing ( 61 ) intervene. One of the noses ( 24 ) lies, for example, opposite the hose connection ( 23 ), the other two are each offset by an angle of eg 150 degrees. For inserting the noses ( 24 ) has the groove ( 87 ), for example, three insertion grooves ( 88 ), see. among others 2 , The resulting unequal pitch prevents inadvertent release of the connection.

In the longitudinal direction of the core drill has the groove ( 87 ) For example, approximately three times the length of a single nose. So can about the adjustment of the suction adapter ( 20 ), which can be adjustable by a few millimeters, the length of the annular gap ( 8th ) between the suction adapter ( 20 ) and the dry core bit ( 1 ). The area of this Annular gap ( 8th ) is, for example, smaller than the sum of the cross-sectional areas of all end bores ( 6 ).

To the drill bit ( 1 ), the suction adapter ( 20 ) a sleeve-shaped expansion ( 25 ), see. 3 , with an example circular suction opening ( 26 ). This intake opening ( 26 ) covers the face bores ( 6 ). The maximum dimension of the suction adapter ( 20 ) at the intake opening ( 26 ) is here - transverse to the center line of the main shaft ( 70 ) - about 90% of the diameter of the drill bit ( 1 ).

The intake opening ( 26 ) may also have a square, oval, elliptical etc. cross section.

The basic body ( 21 ) has a large radial opening ( 28 ), see. the 3 and 4 , which are here eg by a detachable snap cover ( 22 ) is closed. The snap cover ( 22 ) sits positively and non-positively on the base body ( 21 ). The through the cap ( 22 ) closable opening ( 28 ) is required to remove the drill bit ( 1 ) on the drill bit adapter ( 50 ) of the main shaft ( 70 ) to attach. The radial opening ( 28 ) may, for example, have an opening sector of 300 degrees.

The closure lid ( 22 ) can be detachable or insoluble with the main body ( 21 ). For example, it can be completely removable, cf. the 3 and 4 , He is then stretched during assembly, for example, elastic and on the base body ( 21 ) attached. After putting it around the body ( 21 ), for example, in an angular range of 330 degrees and thus closes the opening ( 28 ) of the basic body ( 21 ). If necessary, the closure lid ( 22 ) also with the help of fastening and or connecting means on the base body ( 21 ) be attached. The basic body ( 21 ) and the closure lid ( 22 ) can also be connected to each other by a captive.

The closure lid ( 22 ) can also be designed as a sliding cover, see. 5 , To open it is then in the representation of 5 moved to the right. Here, for example, a locking cam ( 32 ) of the closure lid ( 22 ) from a notch ( 31 ) on the base body ( 21 ) in a guide groove ( 34 ) in a notch ( 33 ) postponed. In the open state, the position of the closure lid ( 22 ), so that the tool change is not hindered. When closed, the locking of the closure lid ( 22 ) a safe function of the suction. Instead of a lock, the position of the closure lid ( 22 ) are secured in the open and / or in the closed position by means of friction, with the help of mechanical fasteners, etc.

The 6 shows a suction adapter with removed cap ( 22 ). For closing the base body ( 21 ), the closure cover shown here ( 22 ) are stretched elastically in the transverse direction. After putting on then snap the locking cams ( 32 ) in the guide grooves ( 34 ). Also pushing on the closure lid ( 22 ) on the basic body ( 21 ) is possible.

In the case of a permanent connection, the closure cap ( 22 ) with a film hinge ( 38 ) to the main body ( 21 ), cf. 7 , The film joint ( 38 ) is then, for example, in the longitudinal direction of the core drill. For opening, eg for tool mounting, the closure lid ( 22 ) then swung sideways. In the closed position, the closure lid ( 22 ) held in this embodiment by means of a releasable positive and / or non-positive connection. The closure lid ( 22 ) has, for example, a locking tab ( 35 ) with a catch ( 36 ), which in the closed position of the closure lid ( 22 ) in a notch ( 37 ) on the base body ( 21 ) engages.

Other mounting and mounting options of the cap ( 22 ) are conceivable.

The hose connection ( 23 ), see. 1 , is at the base body ( 21 ) eg by welding, gluing, latching, fastened by means of fasteners, etc. He is for example radially to the main shaft ( 70 ) and sits eg - not shown here - offset by 30 degrees to the handle ( 48 ). The hose connection ( 23 ) - and thus the entire suction adapter ( 20 ) - by loosening and closing the clamp on the handle ( 48 ) are adjusted in the radial direction in an angular range of about 300 degrees. The hose connection ( 23 ) encloses a suction opening ( 27 ), whose cross section here about one third of the cross section of the suction port ( 26 ) corresponds. Is used during dry drilling to the hose connection ( 23 ) connected to the hose of an industrial vacuum cleaner, the dust generated during drilling can be removed through the drill bit ( 1 ) or through their bores ( 6 ) via the suction adapter ( 20 ) are sucked off at least for the most part.

The 8th - 12 show a further embodiment of a suction adapter ( 20 ). Here is the cap ( 22 ), see. 12 , on the main body ( 21 ) attached. Its location is determined by means of a at the periphery of the body ( 21 ) molded annular groove ( 29 ) with a stop collar ( 41 ) into which an annular cam ( 39 ) of Ver end cap ( 22 ) intervenes.

The large bearing surface of the closure lid ( 22 ) on the base body ( 21 ) hinders on the one hand the ingress of false air, on the other hand, the stability of the suction adapter ( 20 ) elevated.

The hose connection ( 23 ) has at its in the body ( 21 ) end ( 42 ) a flattening ( 43 ), see. 9 , With locking handles ( 44 ) takes hold of this end ( 42 ) the basic body ( 21 ), see. 8th , The attachment end ( 42 ) has at its periphery, for example, three longitudinal slots ( 45 ) on.

To the hose connection ( 23 ) into the receiving opening ( 46 ) of the basic body ( 21 ), see. 9 use, the end ( 42 ) in the region of the longitudinal slots ( 45 ) pressed together. When inserting the latching interlocks ( 44 ) with the basic body ( 21 ).

All parts of the in the 1 - 12 illustrated suction adapters ( 20 ) are made for example of an impact-resistant plastic.

During assembly, the suction adapter ( 20 ) before inserting the core drilling tool ( 1 ) over the free end of the main shaft ( 70 ) pushed. On the machine housing ( 60 ), the noses ( 24 ) through the insertion grooves ( 88 ) into the groove ( 87 ) and under the handle clamp ( 49 ) guided. By subsequently turning the suction adapter ( 20 ), the hose connection ( 23 ) are rotated to the desired position. At the same time twisting - as with a bayonet lock - unintentional loosening of the hose adapter ( 20 ) prevented. By means of the handle ( 48 ), the position of the suction adapter ( 20 ) are fixed.

The fixation of the hose connection ( 20 ) can also be done by means of a differently shaped non-positive and / or positive connection. These may include screws, splines, etc.

Adjusting the hose adapter ( 23 ) and the dismantling of the suction adapter ( 20 ) takes place in the reverse order.

To the Example of setting a socket or junction box hole will be the center of the future Bore first with a grain or pointed chisel marked on the corresponding wall. Once the rotating drill bit touches the wall to be drilled, the drilling begins.

The industrial vacuum cleaner now sucks the dust from the interior ( 7 ) of the drill bit ( 1 ), without the drilling process must be interrupted for this. Because of the small area of the annular gap ( 8th ) relative to the surface of the end bores ( 6 ), only a small secondary air volume flow is absorbed. At the same time, the suction ensures that the abrasive dust in the interior of the drill bit ( 1 ). Even deep core holes can be produced in one go - without having to remove the core drill.

With the suction adapter is a small total length of the core drill feasible.

1

drill bit Dry core bit, core drilling tool

2

Bohrkronentopf

3

ground

4

internally threaded flange

5

diamond segments

6

end holes

7

Interior of ( 1 )

8th

annular gap

9

flattening

10

centering

16

beaded

20

suction

21

body

22

Cap, snap-on lid

23

hose connection

24

nose

25

widening

26

suction

27

suction

28

Opening in ( 21 )

29

Ring groove in ( 21 )

31

notch

32

locking cams

33

notch

34

guide

35

flap

36

locking lug

37

notch

38

film hinge

39

annular cam on ( 22 )

41

stop collar

42

attachment end

43

flattening

44

Rest undercuts

45

longitudinal slots

46

receiving opening

48

handle

49

Handle clamp

50

Adapter drill bit, receiving adapter

51

Through Hole

53.54

external thread

60

machine housing

61

gearbox

62

intermediate housing

63

stator

64

Through Hole in the intermediate housing

65

housing collar at the intermediate housing

66

dowel

67

screw

68

housing collar on the gearbox

69

circlip

70

main shaft

71

Blind hole, central

73

face

74

shaft collar

75

longitudinal groove

76

Sechskantabflachung

81

output gear

82

Adjusting spring

83

deep groove or shoulder camp

84

needle roller bearings

85

Shaft seal

86

labyrinth seal

87

groove

88

insertion grooves

90

spurious

91

support flange

92

sliding ring

93

sliding disk

94

friction lining

95

Belleville spring

96

mother

98

coupling wheel

99

Nebenwellenrad, second

101

Deep groove ball bearings

102

needle roller bearings

111

Motor shaft end

112

pinion

113

Motor bearings, front; Deep groove ball bearings

114

fan

115

Shaft seal

Claims (10)

Core drilling machine with a drill bit, wherein the drill bit in its bottom facing away from the drill cutting edge has at least one end bore which connects the interior of the drill bit with the environment of the drill bit, characterized in that - the core drill a suction adapter ( 20 ) with at least one suction opening ( 26 ) and at least one suction opening ( 27 ), - that in the entire rotation angle range of the drill bit ( 1 ) the suction opening ( 26 ) the end bore ( 6 ) covered. Core drilling machine according to claim 1, characterized in that the suction adapter ( 20 ) at least partially the main shaft ( 70 ) surrounds the core drilling machine. Core drilling machine according to claim 1, characterized in that the suction adapter ( 20 ) detachable on the machine housing ( 60 ) is attached. Core drilling machine according to claim 3, characterized in that the suction adapter ( 20 ) by means of a bayonet lock on the machine housing ( 60 ) is attached. Core drilling machine according to claim 1, characterized in that between the drill bit ( 1 ) and the suction adapter ( 20 ) an adjustable annular gap ( 8th ) lies. Core drilling machine according to claim 5, characterized in that the surface of the annular gap ( 8th ) is smaller than the sum of the cross sections of all end bores ( 6 ). Core drilling machine according to claim 1, characterized in that the suction opening ( 27 ) of the suction adapter ( 20 ) from a hose connection ( 23 ) is limited. Core drilling machine according to claim 7, characterized in that the radial position of the hose adapter ( 23 ) is adjustable. Core drilling machine according to claim 1, characterized in that the suction adapter ( 20 ) a closure lid ( 22 ) having. Core drilling machine according to claim 9, characterized in that the closure lid ( 22 ) at least in the closed position non-positively and / or positively with a base body ( 21 ) of the suction adapter ( 20 ) connected is.