CN114701074A

CN114701074A - Flat drilling device

Info

Publication number: CN114701074A
Application number: CN202210368748.1A
Authority: CN
Inventors: 经志荣
Original assignee: Zhejiang Tongda Electrical Appliance Co ltd
Current assignee: Zhejiang Tongda Electrical Appliance Co ltd
Priority date: 2022-04-08
Filing date: 2022-04-08
Publication date: 2022-07-05
Anticipated expiration: 2042-04-08
Also published as: CN114701074B

Abstract

The invention relates to a flat drilling device, which is carried in an auxiliary handle of an electric hammer and comprises a power output gear arranged on the outer edge of the front end of a main chuck of the electric hammer, a power switching component connected with the power output gear, a fixing component for fixing the power switching component, a drilling execution component arranged at the front end of the power switching component, and an automatic feeding component arranged in the power switching component and connected with the drilling execution component. The components are connected with each other to form positioning and support each other functionally, and two functions are perfected under the condition of simplified structure.

Description

Flat drilling device

Technical Field

The invention belongs to the technical field of electric hammers in electric tools, and particularly relates to a flat drilling device installed in an electric hammer.

Background

The electric hammer is the handheld electric tool commonly used in the fitment field, it can also output reciprocal impact (strike and bore) when output torque (flat drill), and can switch between output torque and output impact in practical application best, for example, drill on bathroom wall ceramic tile, need the flat drill to bore through the ceramic tile earlier, strike and bore to the required hole depth again, in order to avoid direct impact to make the ceramic tile break, in order to make the user can switch required mode as required, some electric hammers are equipped with comparatively complicated switching mechanism, this type of switching mechanism not only poor stability, the processing of spare part is also comparatively troublesome, implement the cost height who uses. Therefore, most electric hammers on the market are not designed with such a switching function.

And the general operation personnel of drilling on actual wall ceramic tile select pistol drill, electric hammer and corresponding drill bit to use in combination, and the process steps need use pistol drill at first to install the special drill bit of ceramic tile, and the glaze on the ceramic tile is ground off a fritter gently at low-speed, and then the ceramic tile layer is worn out again, then uses percussion drill or light-duty electric hammer installation concrete drill bit to beat the hole to the required degree of depth.

Therefore, the drilling on the ceramic tile on the wall surface needs to be completed by carrying two electric tools and switching the use back and forth. This is very big to such engineering influence of similar furred ceiling because the characteristics of furred ceiling engineering are: the number of drilled holes is large (each wall surface needs to be drilled with row holes); secondly, an operator is required to stand on a ladder or a working stool for completion; the operator stands have certain height and small space; in such an environment, two types of electric tools are carried at the same time and frequently switched, which greatly affects working efficiency, labor intensity and personal safety.

In addition, among the present fitment style, wall tiling and wood veneer pasting are more and more, and the same hole of going into the wall that opens deeply on wood veneer directly adopts the electric hammer drilling can cause big damage to the face, consequently also need earlier to use the pistol drill of flat drill function earlier to the face drilling, uses the electric hammer again to drill at the wall to this comes the integrity on protection plate surface, need carry above-mentioned two kinds of electric tools to switch over the use in doing so in the operation equally. On the other hand, in the process of using the pistol drill to drill the ceramic tile, the feeding amount is controlled by manpower, and the drill bit is broken due to the fact that the force is often too large to drill the ceramic tile quickly.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a flat drilling device which is mounted on an electric hammer to extend the function of the electric hammer as a flat drill.

The invention aims to be realized by the following technical scheme: a flat drilling device is carried in an auxiliary handle of an electric hammer and comprises a power output gear arranged on the outer edge of the front end of a main chuck of the electric hammer, a power switching assembly connected with the power output gear, a fixing assembly for fixing the power switching assembly, a drilling execution assembly arranged at the front end of the power switching assembly, and an automatic feeding assembly arranged in the power switching assembly and connected with the drilling execution assembly.

Preferably, the power adapter assembly comprises a vertical shaft with the axis parallel to the auxiliary handle, a power input gear which is rotatably arranged in the vertical shaft and is meshed with the power output gear, and a first bevel gear which is connected with the power input gear through a connecting shaft. The invention mainly adopts the bevel gear to transmit in the power switching part, and aims to reduce the space as much as possible, reduce visual obstruction and reduce the weight.

Preferably, the fixing assembly comprises an inner support fastening sleeve arranged at a position, close to the upper edge, of the auxiliary handle and facing the front end, a ratchet locking sleeve arranged in the auxiliary handle and used for unlocking and locking the inner support fastening sleeve in a fastening and loosening mode, and a connecting sleeve, wherein one end of the connecting sleeve is in threaded connection with the vertical shaft, and the other end of the connecting sleeve is connected with the inner support fastening sleeve. The circular inner support is fastened in a centering accurate mode, namely, the error after repeated clamping is extremely small, the fastening reliability is high, and the principle is as simple and reliable as a three-jaw chuck of a lathe and a ratchet locking mode.

Preferably, the drilling executing assembly comprises a second bevel gear which is arranged in the vertical shaft and faces to the front end and is meshed with the first bevel gear, a Morse taper shank chuck arranged at the front end of the second bevel gear, and an auxiliary supporting piece which is arranged at the lower part of the Morse taper shank chuck and is hinged on the vertical shaft, wherein the Morse taper shank chuck is a common connecting mode of a mechanical drilling machine, is reliable in connection and convenient to detach, can be conveniently adjusted in positioning of a drill bit by arranging the auxiliary supporting piece, is used for controlling the feeding amount of drilling, is unstable due to manual control compared with the feeding amount in the prior art, is provided with uniform linearity by the automatic feeding assembly after being improved, and is beneficial to the quality of drilling and the abrasion of the drill bit.

Preferably, the automatic feeding assembly comprises a spline shaft, one end of the spline shaft is connected with the Morse taper shank chuck, the other end of the spline shaft penetrates through the second bevel gear and can synchronously rotate and relatively slide with the second bevel gear, a third bevel gear, a speed reduction pinion, a speed reduction big gear, a reciprocating screw rod, a sliding sleeve, a pushing piece and a connecting piece, wherein the third bevel gear is arranged in the vertical shaft, is meshed with the first bevel gear and is opposite to the second bevel gear, the speed reduction pinion is arranged outside the vertical shaft and is coaxially connected with the speed reduction pinion, the reciprocating screw rod is coaxially and detachably connected with the speed reduction big gear, the sliding sleeve is arranged to transmit power with the reciprocating screw rod through an internal rolling body and a pin shaft, the pushing piece is arranged to be coaxial with the speed reduction pinion and can slide and penetrate into the third bevel gear, and the connecting piece is arranged to connect the pushing piece with the sliding sleeve. The automatic feeding assembly is designed to provide feeding amount, the automatic feeding assembly can rotate and slide by arranging the spline shaft, the reciprocating screw rod is arranged to be matched with the sliding sleeve to serve as an actuating mechanism for pushing, and compared with the prior art, the stroke of the reciprocating screw rod can protect the drill bit from being broken or increasing abrasion due to manual excessive force.

Preferably, the front end connecting part of the spline shaft is provided with a taper matched with the taper hole of the Morse taper shank chuck, the middle part of the spline shaft is a spline part, the tail of the spline part is provided with a spring catch, and the diameter of the tail part of the spline shaft is matched with the diameter of the shaft center hole of the third bevel gear. The integral key shaft is divided into three sections to be used for different functions, and the design is simple and practical.

Preferably, the automatic feeding assembly further comprises a return spring sleeved on the periphery of the spline part in the spline shaft; the return spring is arranged between the second bevel gear and the third bevel gear. The return spring completes the return in this position and utilizes this space.

Preferably, the auxiliary supporting piece comprises a supporting main body which is arranged to be capable of being overturned to a horizontal position and attached to the vertical shaft, and an adjusting supporting part which is arranged to be sleeved on the outer peripheral surface of the supporting main body and capable of being locked in a sliding mode; an overturning avoidance port is arranged in the supporting main body. The auxiliary supporting piece can be folded and can stretch out and draw back in length, is convenient for storage, and also increases the application range.

In conclusion, compared with the prior art, the invention has the following advantages:

the invention relates to an auxiliary handle mounted on an electric hammer, which comprises a power output gear arranged on the outer edge of the front end of a main chuck of the electric hammer, a power switching component connected with the power output gear, a fixing component for fixing the power switching component, a drilling execution component arranged at the front end of the power switching component, and an automatic feeding component arranged in the power switching component and connected with the drilling execution component. The components are connected with each other to form positioning and support each other in function, so that the flat drill and automatic feeding are realized by utilizing the original power source, two functions are perfected under the simplified structure, the problem that the original manual blind excessive feeding amount causes great damage to the drilled bricks and plates is solved.

The flat drill function added in the invention is the expansion outside the structure, and the internal structure of the electric hammer is not changed, so the original impact performance is not affected, each part for realizing the flat drill function can be assembled and disassembled according to the requirement and carried along with the electric hammer, the use is very convenient when in need, the structures of mutual action are mature structures, so the structural stability is good, and particularly, two electric tools do not need to be carried when the ceramic tile is drilled at a high position.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the present invention showing the vertical shaft and the connecting sleeve partially broken away for easy internal viewing;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a schematic structural view of the split spline shaft and the Morse taper shank chuck;

FIG. 5 is a schematic view of the drill bit in an extended position after the combination of the drilling actuation assembly and the auto-feed assembly;

FIG. 6 is a schematic view of the drill bit in a retracted position after the drilling assembly and the auto-feed assembly are assembled;

FIG. 7 is a schematic view of the storage structure of the present invention.

The labels in the figure are:

a main chuck 011; a power output gear 012; an auxiliary handle 02; a power adapter assembly 10; a vertical shaft 11; a power take-in gear 12; a first bevel gear 13; a fixing member 20; an inner support fastening kit 21; a ratchet lock assembly 22; a connecting sleeve 23; a drilling actuation assembly 30; a second bevel gear 31; a morse taper shank chuck 32; the auxiliary support 33; the support body 331; the adjustment support portion 332; an auto-feed assembly 40; a spline shaft 41; a leading end connecting portion 411; a spring catch 412; a tail portion 413; a third bevel gear 42; a reduction pinion 43; a reduction gear 44; a reciprocating screw rod 45; a sliding sleeve 46; a pusher member 47; a connecting piece 48; a return spring 49.

Detailed Description

The invention will be further described with reference to the embodiments shown in the drawings to which:

example 1

As shown in fig. 1 to 3, the flat drilling device is mounted on an auxiliary handle 02 of an electric hammer, and partial components can be mounted and dismounted as required and can be accommodated in the auxiliary handle 02 after being dismounted so as to be carried with the electric hammer, and comprises a power output gear 012 arranged on the outer edge of the front end of a main chuck 011 of the electric hammer, a power adapter assembly 10 connected with the power output gear 012, a fixing assembly 20 for fixing the power adapter assembly 10, a drilling execution assembly 30 mounted at the front end of the power adapter assembly 10, and an automatic feeding assembly 40 mounted in the power adapter assembly 10 and connected with the drilling execution assembly 30.

The power adapter assembly 10 comprises a vertical shaft 11 with the axis parallel to the auxiliary handle 02, a power access gear 12 which is rotatably arranged in the vertical shaft 11 and is meshed with the power output gear 012, and a first bevel gear 13 which is connected with the power access gear 12 through a connecting shaft;

the fixing component 20 comprises an inner support fastening sleeve 21 which is arranged at the position, close to the upper edge, of the auxiliary handle 02 and faces to the front end, a ratchet wheel locking sleeve 22 which is arranged in the auxiliary handle 02 and used for unlocking and locking the fastening and the loosening of the inner support fastening sleeve 21, and a connecting sleeve 23, one end of which is in threaded connection with the vertical shaft 11, and the other end of which is connected with the inner support fastening sleeve 21; the ratchet locking assembly 22 is well known to those skilled in the art and will not be described herein, and the ratchet locking assembly 22 may be any structure capable of locking the rotation of the inner support fastening assembly 21, such as a bayonet lock. The internal stay fastening member 21 is configured as a three-jaw chuck, and the adjusting member is disposed on a side of the auxiliary handle 02 close to the machine body, which is common knowledge to those skilled in the art and will not be described herein again.

The drilling actuating assembly 30 comprises a second bevel gear 31 which is arranged inside the vertical shaft 11 towards the front end and is meshed with the first bevel gear 13, a Morse taper shank chuck 32 which is arranged at the front end of the second bevel gear 31, and an auxiliary support member 33 which is arranged at the lower part of the Morse taper shank chuck 32 and is hinged on the vertical shaft 11;

the automatic feeding assembly 40 comprises a spline shaft 41 which is arranged to be connected with one end of a Morse taper shank chuck 32 and the other end thereof penetrates through a second bevel gear 31 and can synchronously rotate and relatively slide with the second bevel gear 31, a third bevel gear 42 which is arranged inside a vertical shaft 11 and is engaged with a first bevel gear 13 and is opposite to the second bevel gear 31, a reduction pinion 43 which is arranged outside the vertical shaft 11 and is coaxially connected with the third bevel gear 42, a reduction gear 44 which is arranged outside the vertical shaft 11 and is engaged with the reduction pinion 43, a reciprocating screw rod 45 which is coaxially and detachably connected with the reduction gear 44, a sliding sleeve 46 which is arranged to transmit power with the reciprocating screw rod 45 through an internal rolling body and a pin shaft, a connecting piece 47 which is arranged to be coaxial with the reduction pinion 43 and can slidably penetrate into the third bevel gear 42, and a pushing piece 48 which is arranged to connect the pushing piece 47 with the sliding sleeve 46; as shown in fig. 4, the front end connecting portion 411 of the spline shaft 41 is configured to have a taper matching with the taper hole of the morse taper shank chuck 32, the middle portion is a spline portion, a spring stopper 412 is provided at the end of the spline portion, and the diameter of the end portion 413 of the spline shaft 41 matches with the diameter of the shaft center hole of the third bevel gear 42; the automatic feeding assembly 40 further comprises a return spring 49 which is sleeved on the periphery of the spline part in the spline shaft 41; the return spring 49 is located between the second bevel gear 31 and the third bevel gear 42 (considering that the thickness of the drilled tile or wood veneer is about 10mm, the distance between the second bevel gear 31 and the third bevel gear 42 is 10mm plus the minimum thickness of the return spring 49 after compression);

the working principle is as follows:

firstly, the working principle of the drilling executing assembly 30 is that as shown in fig. 6, when the first bevel gear 13 rotates, the second bevel gear 31 rotates along with the first bevel gear, the corresponding spline shaft 41 rotates synchronously, so as to drive the morse taper shank chuck 32 to rotate, and a drill bit clamped in the morse taper shank chuck 32 rotates, so as to realize drilling and cutting;

secondly, the operation principle of the automatic feeding assembly 40 is as shown in fig. 5 and 6, fig. 6 is a state diagram when the morse taper shank chuck 32 is completely retracted, and fig. 5 is a state diagram when the morse taper shank chuck 32 is completely extended; the retraction and extension of the morse taper shank chuck 32 are controlled by the rotation of the first bevel gear 13, specifically, when the first bevel gear 13 rotates, the third bevel gear 42 is driven to rotate, the reduction pinion 43 rotates synchronously while the third bevel gear 42 rotates, the reduction pinion 43 drives the reduction gear 44 to rotate, the reciprocating lead screw 45 rotates while the reduction gear 44 rotates, the sliding sleeve 46 moves to one side of the morse taper shank chuck 32 under the rotation of the reciprocating lead screw 45, here, the sliding sleeve 46 can reciprocate in the thread line of the reciprocating lead screw 45 under the continuous rotation of the first bevel gear 13, meanwhile, the sliding sleeve 46 and the pushing piece 47 move to one side of the morse taper shank chuck 32 synchronously under the connection of the connecting piece 48, so that the end part (i.e. the end part positioned in the axial hole of the third bevel gear 42) of the pushing piece 47 pushes the tail part 413, and the pushing force pushes the spring catch 412 against the elastic force of the return spring 49 to enable the integral spline shaft 41 to move to the morse taper shank chuck 32 to one side 32, the spline shaft 41 is coaxially connected with the morse taper shank chuck 32, so that the morse taper shank chuck 32 rotates and simultaneously realizes automatic feeding, namely, one-time drilling is finished; in the whole operation process, after the sliding sleeve 46 moves to the extreme end of the thread of the reciprocating screw rod 45, that is, the position shown in fig. 5, at this time, the first bevel gear 13 continues to rotate, the sliding sleeve 46 starts to retract, simultaneously, the return spring 49 loses the resisting force, the elastic force pushes the integral spline shaft 41 to one end far away from the morse taper shank chuck 32 (that is, to return to the initial position), in the above working process, the designed reduction pinion 43 and reduction gear 44 reduce the rotation speed, compared with the integral feed amount, the integral feed amount is reduced, but the rotation speed of the drill bit in the morse taper shank chuck 32 is not reduced, so that the smaller feed amount can be ensured, and the surface to be drilled can be better protected from being damaged.

The auxiliary supporting member 33 is provided for improving the position accuracy of drilling, the stability of drilling and controlling the feeding amount, the auxiliary supporting member 33 comprises a supporting main body 331 which is arranged to be capable of turning to a horizontal position and clinging to the vertical shaft 11, and an adjusting supporting portion 332 which is arranged to be sleeved on the outer peripheral surface of the supporting main body 331 and can be locked in a sliding manner; the support main body 331 is provided with a turning avoiding opening to avoid the front end part of the spline shaft 41 when turning and folding, when in use, the auxiliary support member 33 is turned to a horizontal position, the adjusting support part 332 is adjusted to be flush with the head part of the drill bit in the Morse taper shank chuck 32, therefore, the contact of the support part 332 and the wall surface is used as a support for adjusting the alignment of the drill bit and a position point needing to be punched before drilling, and meanwhile, the electric hammer is pressed against the wall surface by the auxiliary support member 33 during drilling, and the feeding amount is only provided by the automatic feeding assembly 40.

Storage of the flat drilling device: as shown in figure 7, when the flat drilling function is not needed, the Morse taper shank chuck 32 is pulled out from the spline shaft 41, the auxiliary support piece 33 is folded and attached to the vertical shaft 11 after being received to the minimum, the vertical shaft 11 is placed in the auxiliary handle 02, the rest parts can be selected to be placed in the connecting sleeve 23 according to the accommodation requirement, and then the connecting sleeve 23 and the auxiliary handle 02 are connected and locked through threads.

The operation simulation of perforating on the wall tile or the wall wood decoration plate is as follows:

step 1, after electrifying inspection, inspecting that no drill bit is installed on the main chuck 011;

step 2, taking out the vertical shaft 11 and the morse taper shank chuck 32 from the auxiliary handle 02, turning the auxiliary support member 33 to a horizontal position, pressing the morse taper shank chuck 32 to be connected with the spline shaft 41, connecting the end with the relatively small diameter of the connecting sleeve 23 with the vertical shaft 11 through threads, pressing the end with the relatively large diameter of the connecting sleeve 23 against the inner support fastening external member 21 (at the moment, the power output gear 012 and the power access gear 12 are in a meshed state), rotating an adjusting member in the inner support fastening external member 21 to fasten the connecting sleeve 23, and locking the inner support fastening external member 21 by the ratchet locking external member 22;

step 3, a drill bit special for the corresponding ceramic tile or a drill bit special for the wood board is arranged in the Morse taper shank chuck 32;

step 4, adjusting the distal end surface of the adjusting support 332 to be flush with the bit;

step 5, the far end face of the adjusting support part 332 is attached to the edge of the wall surface needing to be drilled, and the attachment point is moved to the position where the drill bit is aligned with the wall surface needing to be drilled;

step 6, pressing a starting switch in the electric hammer, rotating the main chuck 011, and knowing according to the principle: the Morse taper shank chuck 32 and the drill bit synchronously rotate, the automatic feeding component 40 starts feeding, and automatically retreats (repeatedly feeding and retreating under the condition that the main chuck 011 does not stop) after the set feeding distance is about 10mm, thereby completing one-time drilling on the surface of the ceramic tile or the wood board;

and 7, filling a concrete drill bit into the main chuck 011 to drill the hole to the required depth, thereby completing one-time drilling.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims

1. The utility model provides a flat drilling device, in auxiliary handle (02) of carrying on electric hammer, characterized in that, including setting up power take-off gear (012) on main chuck (011) front end outer fringe of electric hammer, power switching subassembly (10) of being connected with power take-off gear (012), fixed subassembly (20) that fixes power switching subassembly (10), install drilling execution module (30) at power switching subassembly (10) front end, install in power switching subassembly (10) and automatic feed subassembly (40) of being connected with drilling execution module (30).

2. The flat drilling device according to claim 1, characterized in that the power adapter assembly (10) comprises a vertical shaft (11) with an axis parallel to the auxiliary handle (02), a power input gear (12) rotatably mounted in the vertical shaft (11) and meshed with the power output gear (012), and a first bevel gear (13) connected with the power input gear (12) through a connecting shaft.

3. The flat drilling device according to claim 2, characterized in that the fixing assembly (20) comprises an inner support fastening sleeve (21) arranged at the auxiliary handle (02) near the upper edge and towards the front end, a ratchet locking sleeve (22) arranged in the auxiliary handle (02) for unlocking and locking the fastening and the loosening of the inner support fastening sleeve (21), and a connecting sleeve (23) which is connected with the inner support fastening sleeve (21) at one end and is in threaded connection with the vertical shaft (11) at the other end.

4. A flat drilling device according to claim 2, characterized in that the drilling actuation assembly (30) comprises a second bevel gear (31) arranged inside the vertical shaft (11) towards the front end and meshing with the first bevel gear (13), a morse taper shank cartridge (32) arranged at the front end of the second bevel gear (31), an auxiliary support (33) arranged at the lower part of the morse taper shank cartridge (32) and hinged on the vertical shaft (11).

5. The drag drilling apparatus according to claim 4, wherein the automatic feed assembly (40) comprises a spline shaft (41) provided with one end connected to the Morse taper shank chuck (32) and the other end passing through the second bevel gear (31) and synchronously rotatable and relatively slidable with the second bevel gear (31), a third bevel gear (42) provided inside the vertical shaft (11) and engaged with the first bevel gear (13) and opposed to the second bevel gear (31), a reduction pinion (43) provided outside the vertical shaft (11) and coaxially connected with the third bevel gear (42), a reduction gear (44) provided outside the vertical shaft (11) and engaged with the reduction pinion (43), a reciprocating screw (45) provided coaxially detachably connected with the reduction gear (44), a sliding bush (46) provided to transmit power with the reciprocating screw (45) through an internal rolling body and a pin shaft, a pushing piece (47) which is coaxial with the reduction pinion (43) and can slide and penetrate into the third bevel gear (42), and a connecting piece (48) which is used for connecting the pushing piece (47) with the sliding sleeve (46).

6. The flat drilling device according to claim 5, characterized in that the front end connecting part (411) of the spline shaft (41) is provided with a taper matched with the taper hole of the Morse taper shank chuck (32), the middle part is a spline part, the tail part of the spline part is provided with a spring stop sheet (412), and the tail part (413) of the spline shaft (41) has a diameter matched with the diameter of the axle center hole of the third bevel gear (42).

7. The flat drilling device according to claim 6, wherein the automatic feed assembly (40) further comprises a return spring (49) fitted around an outer periphery of a spline portion in the spline shaft (41); the return spring (49) is located between the second bevel gear (31) and the third bevel gear (42).

8. The flat drilling device according to claim 2, characterized in that the auxiliary support (33) comprises a support body (331) arranged to be turned over to a horizontal position and to be attached to the vertical shaft (11), an adjusting support portion (332) arranged to be fitted over the outer peripheral surface of the support body (331) and to be slidably locked; the support main body (331) is provided with a turnover avoiding opening.