CN114701074B

CN114701074B - Flat drill device

Info

Publication number: CN114701074B
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: 2024-04-26
Anticipated expiration: 2042-04-08
Also published as: CN114701074A

Abstract

The invention relates to a flat drill device which is mounted 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. The invention has the advantages that the two functions are perfected under the simplified structure, the internal structure of the electric hammer is not changed, the original impact performance is not affected, each part for realizing the flat drill function can be assembled and disassembled according to the needs and carried along with the electric hammer, the use is very convenient, the mutual action structure is also a mature structure, the structural stability is good, and two electric tools are not needed to be carried when the ceramic tile is drilled at a high position.

Description

Flat drill device

Technical Field

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

Background

The electric hammer is a common handheld electric tool in the decoration field, and can output reciprocating impact (impact drilling) while outputting torque (flat drilling), and in practical application, the electric hammer is preferably required to be switched between the output torque and the output impact, for example, a wall tile of a bathroom is required to be drilled, the electric hammer is required to drill through the tile in advance, and then the electric hammer is required to drill to the required hole depth so as to avoid the direct impact to break the tile, and in order to enable a user to switch the required working mode according to the requirement, part of the electric hammer is provided with a relatively complex switching mechanism, the switching mechanism has poor stability, the processing of parts is relatively troublesome, and the implementation and application cost is high. Most electric hammers in the market are therefore not designed with such a switching function.

In practice, the operator usually selects a gun drill, an electric hammer and a corresponding drill bit for use in combination on the wall tile, the process steps firstly need to use the gun drill to install the special drill bit for the tile, the glaze on the tile is ground off slightly at a low speed, then the tile layer is penetrated, and then the impact drill or the light electric hammer is used for installing the concrete drill bit to drill the hole to the required depth.

It can be seen that two kinds of electric tools are required to be carried on the ceramic tile of the wall surface for drilling, and the drilling can be completed once by switching the two kinds of electric tools back and forth. This has a great impact on such an engineering as a suspended ceiling because the suspended ceiling engineering is characterized by: ① The number of the drilled holes is large (each wall surface needs to be drilled with row holes); ② The operator is required to stand on a ladder or a working bench to finish the work; ③ The operator station has a certain height and small space; two kinds of electric tools are carried simultaneously and are frequently switched under the environment, and the operation efficiency, the labor intensity and the personal safety are greatly influenced.

In addition, in the decoration style nowadays, more and more wall surface ceramic tiles and wood veneer are pasted, the same wood veneer is provided with holes penetrating into the wall surface, and the large damage is caused to the wall surface by directly adopting an electric hammer drill, so that a pistol drill with a flat drill function is also required to be used for firstly drilling the wall surface, and then the electric hammer is used for drilling the wall surface, so that the integrity of the surface of the wall surface is protected, and the two electric tools are required to be carried for switching in the operation. On the other hand, in the process of drilling the ceramic tile by using the pistol drill, the feeding amount is controlled by manpower, so that the drill bit is often broken due to overlarge force for quickly completing drilling.

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 drill device that is mounted on an electric hammer to expand the function of the flat drill.

The invention aims at realizing the following technical scheme: the utility model provides a flat drill device carries on in the auxiliary handle of electric hammer, includes the power take off gear that sets up on the main chuck front end outer fringe of electric hammer, the power switching subassembly of being connected with the power take off gear, carries out the fixed subassembly of fixed with the power switching subassembly, installs the drilling execution assembly in power switching subassembly front end, installs in the power switching subassembly and the automatic feed subassembly of being connected with the drilling execution assembly.

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

Preferably, the fixing assembly comprises an inner support fastening sleeve member which is arranged on the auxiliary handle near the upper edge part and faces the front end, a ratchet locking sleeve member which is arranged in the auxiliary handle and used for unlocking and locking the fastening and the loosening of the inner support fastening sleeve member, and a connecting sleeve which is connected with the vertical shaft through threads at one end and the inner support fastening sleeve member at the other end. The circular internal support mode is accurate in centering, namely, the error after repeated clamping is extremely small, the reliability of the fastening 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 execution assembly comprises a second bevel gear which is arranged at the front end inside the vertical shaft and is meshed with the first bevel gear, a Morse taper shank chuck which is arranged at the front end of the second bevel gear, an auxiliary support piece which is arranged at the lower part of the Morse taper shank chuck and hinged on the vertical shaft, and the Morse taper shank chuck which is a common connection mode of a mechanical drilling machine, is reliable and convenient to connect and detach, and is convenient for adjusting the positioning of a drill bit, and on the other hand, the auxiliary support piece is used for controlling the feeding amount of the drilling, and compared with the prior art, the feeding amount is provided by the uniform linearity of the automatic feeding assembly after the improvement, so that the quality of the drilling and the abrasion of the drill bit are beneficial.

Preferably, the automatic feeding assembly comprises a spline shaft, a third bevel gear, a reduction pinion, a reduction gear, a reciprocating screw rod, a sliding sleeve, a pushing piece and a connecting piece, wherein 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, the spline shaft can synchronously rotate and relatively slide with the second bevel gear, the third bevel gear is arranged inside the vertical shaft, meshed with the first bevel gear and opposite to the second bevel gear, the reduction pinion is arranged outside the vertical shaft and coaxially connected with the third bevel gear, the reduction gear is arranged outside the vertical shaft and meshed with the reduction pinion, the reciprocating screw rod is coaxially and detachably connected with the reduction gear, the sliding sleeve is used for transmitting power with the reciprocating screw rod through an internal rolling body and a pin shaft, the pushing piece is coaxial with the reduction gear and can slidably penetrate into the third bevel gear, and the connecting piece is used for connecting the pushing piece and the sliding sleeve. The automatic feeding assembly is designed to provide feeding quantity, the automatic feeding assembly can rotate and slide through the spline shaft, and the reciprocating screw rod is matched with the sliding sleeve to serve as an actuating mechanism for pushing.

Preferably, the front end connecting part of the spline shaft is provided with a taper matched with a taper hole of the Morse taper shank chuck, the middle part is a spline part, the tail end of the spline part is provided with a spring baffle, and the diameter of the tail end of the spline shaft is matched with the diameter of an axle center hole of the third bevel gear. The spline shaft is arranged in three sections 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 located between the second bevel gear and the third bevel gear. The return spring completes the return at this position and uses this space.

Preferably, the auxiliary supporting piece comprises a supporting main body which is arranged to be capable of being overturned to a horizontal limit and being abutted against 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 way; the support main body is provided with a turnover avoiding opening. The auxiliary support piece can be folded and can be telescopic in length, so that the storage is convenient, and the application range is enlarged.

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

The invention 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. All the components are mutually connected to form positioning and are mutually supported in function, namely, the flat drill and automatic feeding are realized by utilizing the original power source, two functions are perfected under the structural simplification, and the situation that the original manpower blindly excessively feeds the bricks and the plates for drilling the holes is avoided.

The added flat drill function is expanded outside the structure, the internal structure of the electric hammer is not changed, so that the original impact performance is not affected, all parts for realizing the flat drill function can be assembled and disassembled according to the needs and carried along with the electric hammer, the flat drill is very convenient to use, and the mutual action structure is also a mature structure, so that the structural stability is good, and two electric tools are not needed to be carried when the ceramic tile is drilled at a high position.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic view of the invention with the vertical shaft and coupling sleeve partially broken away for internal viewing;

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

FIG. 4 is a schematic diagram of the structure of the spline shaft after being disassembled from the Morse taper shank chuck;

FIG. 5 is a schematic view of the drill bit in an extended configuration after the combination of the drill hole execution assembly and the automatic feed assembly;

FIG. 6 is a schematic view of the drill bit in a retracted state after the combination of the drill hole execution assembly and the automatic feed assembly;

fig. 7 is a schematic view of the structure of the invention when stored.

The marks in the figure:

A main chuck 011; a power take-off gear 012; an auxiliary handle 02; a power transfer assembly 10; a vertical shaft 11; a power take-in gear 12; a first bevel gear 13; a fixing assembly 20; an inner stay fastening sleeve 21; a ratchet lock sleeve 22; a connecting sleeve 23; a borehole execution assembly 30; a second bevel gear 31; mohs taper shank collet 32; an auxiliary support 33; a support body 331; an adjustment support 332; an automatic feed assembly 40; a spline shaft 41; a front end connection 411; a spring catch 412; a tail portion 413; a third bevel gear 42; a reduction pinion gear 43; a reduction gear wheel 44; a reciprocating screw 45; a sliding sleeve 46; a pusher 47; a connecting piece 48; and a return spring 49.

Detailed Description

The invention is further described below with reference to embodiments shown in the drawings in which:

Example 1

As shown in fig. 1 to 3, a flat drill device is mounted in an auxiliary handle 02 of an electric hammer, and part of components can be mounted and dismounted as required, and can be stored in the auxiliary handle 02 after being dismounted so as to be carried along with the electric hammer, and the flat drill device 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 transfer assembly 10 connected with the power output gear 012, a fixing assembly 20 for fixing the power transfer assembly 10, a drilling execution assembly 30 mounted at the front end of the power transfer assembly 10, and an automatic feeding assembly 40 mounted in the power transfer assembly 10 and connected with the drilling execution assembly 30.

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

The fixing assembly 20 comprises an inner support fastening sleeve 21 which is arranged on the auxiliary handle 02 near the upper edge part and faces the front end, a ratchet 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 which is connected with the vertical shaft 11 through threads at one end and the inner support fastening sleeve 21 at the other end; the ratchet locking sleeve 22 is well known to those skilled in the art and will not be described in detail herein, and the ratchet locking sleeve 22 may be any structure capable of locking the rotation of the inner stay fastening sleeve 21, such as a bayonet lock. The internal stay fastening sleeve 21 is constructed as a three-jaw chuck, and the adjusting member is disposed on the side of the auxiliary handle 02 near the main body, and is common knowledge to those skilled in the art, and will not be repeated herein.

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

The automatic feeding assembly 40 includes a spline shaft 41 provided with one end connected to the morse taper shank chuck 32 and the other end penetrating through the second bevel gear 31 and being rotatable synchronously and slidable relative to 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 gear 43 provided outside the vertical shaft 11 and coaxially connected to the third bevel gear 42, a reduction large gear 44 provided outside the vertical shaft 11 and engaged with the reduction small gear 43, a reciprocating screw 45 provided in coaxial detachable connection with the reduction large gear 44, a slide sleeve 46 provided to transmit power through an internal rolling body and a pin shaft with the reciprocating screw 45, a pusher 47 provided coaxially and slidably penetrating into the third bevel gear 42, and a connecting piece 48 provided to connect the pusher 47 with the slide sleeve 46; as shown in fig. 4, the front end connecting part 411 of the spline shaft 41 is provided with a taper matching with the taper hole of the morse taper shank chuck 32, the middle part is a spline part, the tail end of the spline part is provided with a spring baffle 412, and the diameter of the tail end part 413 of the spline shaft 41 is matched with the diameter of the axle center hole of the third bevel gear 42; the automatic feeding assembly 40 further includes a return spring 49 fitted around the outer periphery of the 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 (since 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 size of the return spring 49 compressed to the minimum thickness);

Working principle:

1. the working principle of the drilling execution 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 rotation of the first bevel gear, and the corresponding spline shaft 41 synchronously rotates, so that the Morse taper shank chuck 32 is driven to rotate, and a drill bit clamped in the Morse taper shank chuck 32 rotates, thereby realizing drilling and cutting;

2. The principle of operation of the automatic feed assembly 40 is shown in fig. 5 and 6, where fig. 6 is a state diagram of the morse taper shank chuck 32 fully retracted and fig. 5 is a state diagram of the morse taper shank chuck 32 fully 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 and drives the third bevel gear 42 to rotate, the speed reducing pinion 43 synchronously rotates while the third bevel gear 42 rotates, the speed reducing pinion 43 drives the speed reducing gear 44 to rotate, the speed reducing gear 44 rotates and the reciprocating screw 45 rotates along with the speed reducing gear, the sliding sleeve 46 moves towards one side of the morse taper shank chuck 32 under the rotation of the reciprocating screw 45, the sliding sleeve 46 can reciprocate in the thread line of the reciprocating screw 45 under the continuous rotation of the first bevel gear 13, and at the same time, the sliding sleeve 46 and the pushing piece 47 synchronously move towards one side of the morse taper shank chuck 32 under the connection of the connecting piece 48, so that the end part (namely, one end positioned in the axle center hole of the third bevel gear 42) of the pushing piece 47 pushes the tail part 413, the pushing force pushes the spring blocking piece 412 to press and overcomes the elasticity of the reset spring 49 to enable the spline shaft 41 to integrally move towards the morse taper shank chuck 32, the spline shaft 41 is coaxially connected with the morse taper shank chuck 32, thereby realizing the automatic feeding of the morse taper shank chuck 32, and the automatic feeding of the morse taper shank chuck 32 is realized, namely simultaneously drilling is completed once drilling; in the whole action process, after the sliding sleeve 46 moves to the extreme end of the thread line of the reciprocating screw rod 45, namely, the position shown in fig. 5, at the moment, the first bevel gear 13 continues to rotate, the sliding sleeve 46 starts to retract, meanwhile, the restoring spring 49 loses the supporting pressure, the elastic force of the restoring spring pushes the integral spline shaft 41 towards the end far away from the Morse taper shank chuck 32 (namely, the restoring spring returns to the initial position), in the working process, the rotation speed of the designed reduction pinion 43 and the reduction gear 44 is reduced, compared with the integral feeding amount, the rotation speed of the drill bit in the Morse taper shank chuck 32 is not reduced, so that the smaller feeding amount can be ensured, and the drilled surface can be better protected from being damaged.

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

Storage of the flat drill device: when the flat drill function is not needed, the Morse taper shank chuck 32 is pulled out of the spline shaft 41, the auxiliary support piece 33 is folded to be abutted against the vertical shaft 11 after being received minimum, the vertical shaft 11 is placed in the auxiliary handle 02, other parts can be selected to be placed in the connecting sleeve 23 according to the containing requirement, and then the connecting sleeve 23 and the auxiliary handle 02 are locked through threaded connection, as shown in fig. 7.

Operation simulation of opening holes in wall tiles or wall wood trim panels:

Step 1, after power-on inspection, inspecting that a drill bit is not installed on a 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 supporting piece 33 to a horizontal position, pressing the Morse taper shank chuck 32 to be connected with the spline shaft 41, connecting one end with a relatively small diameter of the connecting sleeve 23 with the vertical shaft 11 in a threaded manner, pressing one end with a relatively large diameter of the connecting sleeve 23 against the internal support fastening sleeve 21 (at the moment, the power output gear 012 and the power access gear 12 are in a meshed state), rotating an adjusting piece in the internal support fastening sleeve 21 to fasten the connecting sleeve 23, and locking the internal support fastening sleeve 21 by the ratchet locking sleeve 22;

step 3, loading a corresponding special drill bit for ceramic tiles or a special drill bit for wood boards into the Morse taper shank chuck 32;

Step 4, adjusting the distal end surface of the adjustment support part 332 to be flush with the bit head;

step 5, the distal end face of the adjusting support part 332 is abutted against the edge of the hole to be drilled on the wall surface, and then the abutted point is moved to align the drill bit with the position to be drilled on the wall surface;

step 6, pressing a start switch in the electric hammer, and rotating the main chuck 011, which is known according to the above principle: the morse taper shank chuck 32 rotates synchronously with the drill bit, the automatic feeding assembly 40 starts feeding, and automatically retreats (the main chuck 011 is repeatedly fed and retreated without stopping) after a set feeding distance of about 10mm is reached, thereby completing one-time drilling of the ceramic tile or the wood board surface;

And 7, loading a concrete drill bit into the main chuck 011 to drill the hole to a required depth, thereby completing one drilling.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. An electric hammer auxiliary handle (02) is mounted in the electric hammer, and is characterized by comprising 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 switching assembly (10) connected with the power output gear (012), a fixing assembly (20) for fixing the power switching assembly (10), a drilling execution assembly (30) arranged at the front end of the power switching assembly (10), and an automatic feeding assembly (40) arranged in the power switching assembly (10) and connected with the drilling execution assembly (30); the automatic feeding assembly (40) comprises a spline shaft (41) with one end connected with a Morse taper shank chuck (32) and the other end penetrating through a second bevel gear (31) and capable of synchronously rotating and relatively sliding with the second bevel gear (31), a third bevel gear (42) arranged inside a vertical shaft (11) and meshed with a first bevel gear (13) and opposite to the second bevel gear (31), a speed reducing pinion (43) arranged outside the vertical shaft (11) and coaxially connected with the third bevel gear (42), a speed reducing large gear (44) arranged outside the vertical shaft (11) and meshed with the speed reducing pinion (43), a reciprocating screw (45) arranged to be coaxially and detachably connected with the speed reducing large gear (44), a sliding sleeve (46) arranged to be coaxial with the reciprocating screw (45) through an internal rolling body and a pin shaft and capable of penetrating into a pushing piece (47) inside the third bevel gear (42), and a connecting piece (48) arranged to connect the pushing piece (47) with the sliding sleeve (46).

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

3. The flat drill device according to claim 2, wherein the fixing assembly (20) comprises an inner support fastening sleeve (21) arranged near the upper edge part of the auxiliary handle (02) and facing 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) with one end connected with the vertical shaft (11) in a threaded manner and the other end connected with the inner support fastening sleeve (21).

4. The flat drilling device according to claim 2, wherein the drilling execution assembly (30) comprises a second bevel gear (31) provided inside the vertical shaft (11) toward the front end and engaged with the first bevel gear (13), a morse taper shank chuck (32) provided at the front end of the second bevel gear (31), and an auxiliary support member (33) provided at the lower portion of the morse taper shank chuck (32) and hinged to the vertical shaft (11).

5. The flat drilling device according to claim 1, wherein the front end connecting part (411) of the spline shaft (41) is provided with a taper matched with a taper hole of the Morse taper shank chuck (32), the middle part is provided with a spline part, the tail end of the spline part is provided with a spring baffle (412), and the diameter of the tail end part (413) of the spline shaft (41) is matched with the diameter of an axle center hole of the third bevel gear (42).

6. The flat drilling device according to claim 5, wherein the automatic feeding assembly (40) further comprises a return spring (49) fitted around the periphery of the 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).

7. The flat drill device according to claim 4, characterized in that the auxiliary support (33) comprises a support body (331) arranged to be overturned to a horizontal limit and to rest against the vertical shaft (11), and an adjusting support part (332) arranged to be sleeved on the outer peripheral surface of the support body (331) and capable of sliding and locking; the support main body (331) is provided with a turnover avoiding opening.