Worm and gear linear motion type electric trepanning driver

Abstract

A worm and gear linear motion type electric trepanning driver comprises a shell, and a gearbox body matched with the shell is arranged at the lower end of the shell; a transmission cavity communicated with the inner space of the shell is formed in the upper surface of the gearbox body; a mounting hole communicated with the transmission cavity is formed in the side wall of the front side of the right part of the gearbox body; an end cover attached to the side wall of the front side of the gearbox body is arranged on the side wall of the front side of the gearbox body, and the end cover shields and seals the mounting hole; a shaft hole is formed in the center of the end cover; a worm matched with the shaft hole is arranged in the shaft hole; a positioning hole coaxial with the worm is formed in the inner wall of the rear side of the transmission cavity; the rear end of the worm penetrates backwards into the positioning hole, and the front end of the worm penetrates forwards out of the shaft hole and is provided with a connecting end. According to the worm and gear linear motion type electric trepanning driver, it can be guaranteed that the trepanning direction is always kept in the axial direction, the situation that the trepanning position deviates is effectively avoided, and the trepanning precision and the trepanning quality are effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of hole openers, in particular to a worm gear linear motion type electric hole opener driver. Background Art

[0002] A hole opener is an auxiliary device that needs to be installed on an ordinary electric drill for opening holes. The connecting end above the hole opener is directly fastened in the drill chuck of the electric drill. When the electric drill is running, the drill chuck of the electric drill will directly drive the hole opener to rotate, thereby cutting a hole of the actual required size through the hole opening head of the hole opener. In order to ensure stability when opening holes, the hole opening head of a traditional hole opener actually refers to a circular saw blade that can be used for cutting. The thickness of the circular saw blade is relatively thin, so the contact area between the circular saw blade itself and the plane to be opened is almost negligible. When the contact area is small, the circular saw blade itself is very likely to tilt under the action of external force, and the actual forward force of the circular saw blade comes from the force applied to the electric drill by the user. In the actual pushing process, the electric drill is very likely to tilt. Once the electric drill is tilted, the circular saw blade will also tilt, resulting in a deviation in the hole opening position, which ultimately affects the hole opening accuracy and hole opening quality. Summary of the invention

[0003] The utility model aims to solve the existing technical problem and provide a worm gear linear motion electric hole opening driver, which can ensure that the hole opening direction always remains axial, effectively avoid the hole opening position deviation, and effectively ensure the hole opening accuracy and hole opening quality.

[0004] The technical solution adopted by the utility model to solve the above technical problems is:

[0005] The utility model discloses a worm gear linear motion electric hole opening driver, comprising a shell, a gearbox body matched with the same is provided at the lower end of the shell; a transmission cavity connected with the inner space of the shell is provided on the upper surface of the gearbox body; a mounting hole connected with the transmission cavity is provided on the front side wall of the right part of the gearbox body; an end cover matched with the same is provided on the front side wall of the gearbox body, and the mounting hole is shielded and sealed by the end cover; an axial hole is provided at the center of the end cover; a worm matched with the same is provided in the axial hole; a positioning hole coaxial with the worm is provided on the rear inner wall of the transmission cavity; the rear end of the worm is inserted into the positioning hole backwards, and the front end of the worm is inserted out of the axial hole forwards and is provided with a connecting end; A perforated head is provided in the part; a keyway is provided on the outer wall of one side of the lower part of the perforated head; a directional slide groove is provided on the inner wall of the shell on the side opposite to the keyway; a flat key matching it is provided in the keyway, and the outer end of the flat key protrudes outward into the directional slide groove; an annular nose cap is provided at the upper end of the shell, and the inner diameter of the nose cap is smaller than the inner diameter of the shell; a traction shaft is provided at the center of the lower end surface of the perforated head; a worm gear shaft coaxial with the traction shaft is provided in the gearbox body; a worm wheel meshing with the worm is provided outside the worm gear shaft; a limiting device matching the worm gear shaft is provided in the transmission cavity; a screw hole is provided in the center of the upper end surface of the worm gear shaft; an external thread is provided on the outer wall of the traction shaft, and the lower end of the traction shaft is screwed into the screw hole through the external thread.

[0006] The upper end of the opening head is located in the inner hole of the nose cap; the upper end surface of the opening head is coplanar with the upper surface of the nose cap.

[0007] The limiting device includes an upper limit step arranged on the inner wall of the upper part of the transmission chamber; an upper auxiliary step is arranged on the outer wall of the worm shaft and is located below the upper limit step; an upper bearing is arranged outside the worm shaft and is located between the upper limit step and the upper auxiliary step; a lower auxiliary step is arranged on the outer wall of the worm shaft and is located below the upper auxiliary step; the lower auxiliary step is annular; an easy-to-disassemble structure matching the transmission chamber is arranged at the lower part of the transmission chamber; a lower bearing is arranged outside the worm shaft and is located between the lower auxiliary step and the easy-to-disassemble structure.

[0008] The easy-to-disassemble structure comprises a disassembly and assembly port provided on the lower surface of the gearbox body, the disassembly and assembly port being connected with the transmission cavity; a cover plate matching the disassembly and assembly port is provided on the lower surface of the gearbox body, and the cover plate shields and seals the disassembly and assembly port; the cover plate and the gearbox body are fixed by a plurality of evenly distributed first screws; an annular embedding groove is provided on the inner wall of the disassembly and assembly port; a retaining ring matching the disassembly and assembly port is provided in the embedding groove, and the inner edge of the retaining ring protrudes inwardly into the disassembly and assembly port; a bearing sleeve is provided in the disassembly and assembly port, which is in contact with the upper surface of the inner edge of the retaining ring; an annular limiting portion is extended inwardly from the edge of the lower end port of the bearing sleeve; the lower part of the lower bearing is located in the bearing sleeve, and the lower surface of the lower bearing is in contact with the upper surface of the limiting portion.

[0009] A set of rear bearings outside the rear end of the worm is arranged in the positioning hole; the end cover and the gearbox body are fixed by a plurality of evenly distributed second screws; a set of front bearings outside the front part of the worm is arranged in the mounting hole.

[0010] The outer peripheral surface of the hole opening head is in contact with the inner wall of the shell; the lower outer wall of the hole opening head is provided with an annular guide part, and the outer peripheral surface of the guide part is in contact with the inner wall of the shell; the outer diameter of the guide part is greater than the inner diameter of the nose cap.

[0011] The outer wall of the lower end of the shell is provided with a connecting portion which fits with the upper surface of the gearbox body; the connecting portion and the gearbox body are fixed by a plurality of evenly distributed third screws.

[0012] The beneficial effects of the utility model are:

[0013] Compared with the prior art, the worm gear linear motion electric hole-opening driver adopting the structure of the utility model can convert the rotating force of the electric drill into the axial movement force of the hole-opening head, so that it does not need to use the rotating force to cut the hole, but can directly open the hole under the action of axial pressure. The presence of the nose cap can increase the contact area between the hole-opening head and the plane to be opened. When the contact area is increased, the side tilt of the hole-opening head can be effectively avoided, and the accuracy of the hole-opening position can be ensured, thereby effectively ensuring the hole-opening quality and hole-opening accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is the front view of the worm gear linear motion electric hole opening driver of the utility model;

[0015] Figure 2 yes Figure 1 AA cross-section diagram;

[0016] Figure 3 It is a top view of the worm gear linear motion electric hole opening driver of the utility model;

[0017] Figure 4 yes Figure 3 The cross-section of BB;

[0018] Figure 5 The utility model is a schematic structural diagram of a worm gear linear motion electric hole opening driver when a hole opening head is axially moved out of an inner hole of a nose cap. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0020] See also Figures 1 to 5The utility model provides a worm gear linear motion electric hole opening driver, comprising a shell 1, a gearbox body 2 matching with it is provided at the lower end of the shell 1; a transmission cavity 3 communicating with the internal space of the shell 1 is provided on the upper surface of the gearbox body 2; a mounting hole 4 communicating with the transmission cavity 3 is provided on the front side wall of the right part of the gearbox body 2; an end cover 5 fitting with it is provided on the front side wall of the gearbox body 2, and the mounting hole 4 is shielded and sealed by the end cover 5; an axial hole 6 is provided at the center of the end cover 5; a worm 7 matching with it is provided in the axial hole 6; a positioning hole 8 coaxial with the worm 7 is provided on the inner wall of the rear side of the transmission cavity 3; the rear end of the worm 7 penetrates backward into the positioning hole 8, and the front end of the worm 7 penetrates forward to the outside of the axial hole 6 and is provided with a connecting end 9; a hole opening head 10 is provided in the upper part of the shell 1; the hole opening A keyway 11 is provided on the outer wall of one side of the lower part of the head 10; a directional slide groove 12 is provided on the inner wall of the side opposite to the keyway 11 of the shell 1; a flat key 13 matching it is provided in the keyway 11, and the outer end of the flat key 13 protrudes outward into the directional slide groove 12; a ring-shaped nose cap 14 is provided on the upper end of the shell 1, and the inner diameter of the nose cap 14 is smaller than the inner diameter of the shell 1; a traction shaft 15 is provided at the center of the lower end face of the perforated head 10; a worm gear shaft 16 coaxial with the traction shaft 15 is provided in the gearbox body 2; a worm wheel 17 meshing with the worm 7 is provided on the outside of the worm gear shaft 16; a limiting device matching the worm gear shaft 16 is provided in the transmission chamber 3; a screw hole 18 is provided at the center of the upper end face of the worm gear shaft 16; an external thread 19 is provided on the outer wall of the traction shaft 15, and the lower end of the traction shaft 15 is screwed into the screw hole 18 through the external thread 19.

[0021] The upper end of the opening head 10 is located in the inner hole of the nose cap 14 ; the upper end surface of the opening head 10 is coplanar with the upper surface of the nose cap 14 .

[0022] The limiting device includes an upper limit step 20 arranged on the upper inner wall of the transmission chamber 3; the outer wall of the worm shaft 16 is provided with an upper auxiliary step 21 located below the upper limit step 20; the worm shaft 16 is provided with an upper bearing 22 located between the upper limit step 20 and the upper auxiliary step 21; the outer wall of the worm shaft 16 is provided with a lower auxiliary step 23 located below the upper auxiliary step 21; the lower auxiliary step 23 is annular; the lower part of the transmission chamber 3 is provided with an easy-to-disassemble structure matching it; the worm shaft 16 is provided with a lower bearing 31 located between the lower auxiliary step 23 and the easy-to-disassemble structure.

[0023] The easy-to-disassemble structure includes a disassembly opening 24 provided on the lower surface of the gearbox body 2, and the disassembly opening 24 is connected with the transmission chamber 3; a cover plate 25 matching therewith is provided on the lower surface of the gearbox body 2, and the cover plate 25 shields and seals the disassembly opening 24; the cover plate 25 and the gearbox body 2 are fixed by a plurality of evenly distributed first screws 26; an annular embedding groove 27 is provided on the inner wall of the disassembly opening 24; a retaining ring 28 matching therewith is provided in the embedding groove 27, and the inner edge of the retaining ring 28 protrudes inwardly into the disassembly opening 24; a bearing sleeve 29 fitting with the upper surface of the inner edge of the retaining ring 28 is provided in the disassembly opening 24; an annular limiting portion 30 is extended inwardly from the edge of the lower end port of the bearing sleeve 29; the lower portion of the lower bearing 31 is located in the bearing sleeve 29, and the lower surface of the lower bearing 31 fits with the upper surface of the limiting portion 30.

[0024] A rear bearing 32 is disposed in the positioning hole 8 and is located outside the rear end of the worm 7 . The end cover 5 is fixed to the gearbox body 2 by a plurality of evenly distributed second screws 34 . A front bearing 35 is disposed in the mounting hole 4 and is located outside the front part of the worm 7 .

[0025] The outer circumference of the hole opening head 10 fits with the inner wall of the shell 1; the lower outer wall of the hole opening head 10 is provided with an annular guide portion 36, and the outer circumference of the guide portion 36 fits with the inner wall of the shell 1; the outer diameter of the guide portion 36 is larger than the inner diameter of the nose cap 14.

[0026] The outer wall of the lower end of the housing 1 is provided with a connecting portion 37 that fits with the upper surface of the gearbox body 2 ; the connecting portion 37 and the gearbox body 2 are fixed by a plurality of evenly distributed third screws 38 .

[0027] The method of using the utility model is as follows:

[0028] Before drilling a hole, the connecting end 9 can be inserted into the drill chuck of the electric drill, and the connecting end 9 can be tightened by the drill chuck. Then, the handle of the electric drill can be held with one hand, and the housing 1 can be held with the other hand, and the upper end surface of the nose cap 14 can be attached to the plane where the hole needs to be drilled. At this time, the electric drill is started, and the electric drill will drive the connecting end 9 to rotate through the drill chuck, thereby realizing the rotation of the worm 7, and the worm 7 is meshed with the worm wheel 17. Therefore, when the worm 7 rotates, the worm wheel shaft 16 will rotate synchronously, and the lower part of the traction shaft 15 is screwed to the worm wheel shaft through the external thread 19. The screw hole 18 of the hole opening head 16 is inserted into the screw hole 18 of the hole opening head 16, and the flat key 13 stuck in the keyway 11 on the hole opening head 10 is stuck in the directional slide groove 12 at the same time. Therefore, when the worm gear shaft 16 rotates, the traction shaft 15 will convert the rotational force into its own axial movement force, so that the traction shaft 15 moves stably toward the outside of the housing 1 along the trajectory of the directional slide groove 12, and finally realizes the axial movement of the hole opening head 10. A hole is punched directly on the plane to be punched by the pressure of the axial movement. During the whole punching process, it is only necessary to make the upper end surface of the nose cap 14 close to the plane to be punched.

[0029] From the above, it can be known that the utility model can convert the rotating force of the electric drill into the axial movement force of the hole punching head 10, so that it does not need to use the rotating force to cut the hole, but can directly punch the hole under the action of axial pressure. The presence of the nose cap 14 can increase the contact area between the hole punching head 10 and the plane to be punched. When the contact area is increased, the side tilt of the hole punching head 10 can be effectively avoided, and the accuracy of the hole punching position can be ensured, thereby effectively ensuring the hole punching quality and hole punching accuracy.

[0030] The upper end of the piercing head 10 is located in the inner hole of the nose cap 14, and the upper end surface of the piercing head 10 is coplanar with the upper surface of the nose cap 14. At this time, the existence of the upper surface of the nose cap 14 can increase the actual area of ​​the upper end surface of the piercing head 10 in disguised form, thereby further increasing the actual contact area with the plane to be drilled, and further ensuring the stability of the piercing head 10 when drilling a hole.

[0031] The limiting device includes an upper limit step 20 arranged on the upper inner wall of the transmission chamber 3, an upper auxiliary step 21 located below the upper limit step 20 is arranged on the outer wall of the worm shaft 16, an upper bearing 22 located between the upper limit step 20 and the upper auxiliary step 21 is arranged on the outside of the worm shaft 16, a lower auxiliary step 23 located below the upper auxiliary step 21 is arranged on the outer wall of the worm shaft 16, the lower auxiliary step 23 is annular, and an easy-to-disassemble structure matching it is arranged at the lower part of the transmission chamber 3, and a lower bearing 31 located between the lower auxiliary step 23 and the easy-to-disassemble structure is arranged on the outside of the worm shaft 16. The existence of the upper bearing 22 and the lower bearing 31 can not only ensure the stability of the worm shaft 16 during rotation, but also ensure the smoothness of the worm shaft 16 during rotation, and is more conducive to the axial movement of the hole opening head 10 for hole opening.

[0032] The easy disassembly structure includes a disassembly opening 24 provided on the lower surface of the gearbox body 2, the disassembly opening 24 is connected with the transmission chamber 3, the lower surface of the gearbox body 2 is provided with a cover plate 25 matching therewith, the cover plate 25 shields and seals the disassembly opening 24, the cover plate 25 and the gearbox body 2 are fixed by a plurality of evenly distributed first screws 26, an annular embedding groove 27 is provided on the inner wall of the disassembly opening 24, a retaining spring 28 matching therewith is provided in the embedding groove 27, the inner edge of the retaining spring 28 protrudes inwardly into the disassembly opening 24, and a retaining spring 28 matching therewith is provided in the disassembly opening 24. The bearing sleeve 29 is fitted, and an annular limiting portion 30 extends inward from the edge of the lower end port of the bearing sleeve 29; the lower portion of the lower bearing 31 is located in the bearing sleeve 29, and the lower surface of the lower bearing 31 is fitted with the upper surface of the limiting portion 30. This fixing method facilitates the disassembly and assembly of the cover plate 25 and the gearbox body 2. After the cover plate 25 is disassembled, it is only necessary to take out the retaining ring 28 from the embedding groove 27 to quickly disassemble the bearing sleeve 29 and the lower bearing 31, thereby facilitating the disassembly of other components in the transmission chamber 3 and facilitating the maintenance and replacement of components in the transmission chamber 3.

[0033] A rear bearing 32 is provided in the positioning hole 8 and is located outside the rear end of the worm 7. The end cover 5 and the gearbox body 2 are fixed by a number of evenly distributed second screws 34. A front bearing 35 is provided in the mounting hole 4 and is located outside the front part of the worm 7. The presence of the front bearing 35 and the rear bearing 32 can not only ensure the stability of the worm 7 during rotation, but also ensure the smoothness of the rotation of the worm 7, and can stably drive the worm wheel 17 to rotate, thereby further ensuring the stability of the opening head 10 during axial movement.

[0034] The outer circumference of the hole punching head 10 fits with the inner wall of the shell 1, and the lower outer wall of the hole punching head 10 is provided with an annular guide portion 36, and the outer circumference of the guide portion 36 fits with the inner wall of the shell 1. The existence of the guide portion 36 can play a guiding role when the hole punching head 10 moves axially, and further ensure the stability of the hole punching head 10 during axial movement. The structural design in which the outer diameter of the guide portion 36 is larger than the inner diameter of the nose cap 14 can effectively limit the moving stroke of the hole punching head 10. When the hole punching head 10 moves to the limit, the upper surface of the guide portion 36 will be restricted by the lower surface of the nose cap 14, preventing the hole punching head 10 from continuing to move, and effectively preventing the hole punching head 10 from moving excessively, causing the flat key 13 to directly slide out of the directional slide groove 12, thereby affecting the normal use of the hole punching driver.

[0035] The outer wall at the lower end of the shell 1 is provided with a connecting portion 37 that fits with the upper surface of the gearbox body 2. The connecting portion 37 and the gearbox body 2 are fixed by a plurality of evenly distributed third screws 38. This fixing method facilitates the disassembly and assembly between the shell 1 and the gearbox body 2, thereby facilitating the disassembly and assembly of other components.

[0036] The nose cap 14 and the housing 1 can be fixed together by a plurality of evenly distributed fourth screws 39 . This fixing method is conducive to the disassembly and assembly of the internal components of the housing 1 .

Claims

1. A worm gear linear motion electric hole opening driver, comprising a housing, characterized in that: A gearbox body matching with it is provided at the lower end of the shell; a transmission cavity communicating with the internal space of the shell is provided on the upper surface of the gearbox body; a mounting hole communicating with the transmission cavity is provided on the front side wall of the right part of the gearbox body; an end cover fitting with it is provided on the front side wall of the gearbox body, and the mounting hole is shielded and sealed by the end cover; an axial hole is provided at the center of the end cover; a worm matching with it is provided in the axial hole; a positioning hole coaxial with the worm is provided on the inner wall of the rear side of the transmission cavity; the rear end of the worm is inserted backward into the positioning hole, and the front end of the worm is inserted forward to the outside of the axial hole and is provided with a connecting end; an opening head is provided in the upper part of the shell; the lower part of the opening head A keyway is provided on one outer wall; a directional slide groove is provided on the inner wall of the shell on the side opposite to the keyway; a flat key matching it is provided in the keyway, and the outer end of the flat key protrudes outward into the directional slide groove; an annular nose cap is provided on the upper end of the shell, and the inner diameter of the nose cap is smaller than the inner diameter of the shell; a traction shaft is provided at the center of the lower end surface of the opening head; a worm gear shaft coaxial with the traction shaft is provided in the gearbox body; a worm wheel meshing with the worm is provided outside the worm gear shaft; a limiting device matching the worm gear shaft is provided in the transmission cavity; a screw hole is provided in the center of the upper end surface of the worm gear shaft; an external thread is provided on the outer wall of the traction shaft, and the lower end of the traction shaft is screwed into the screw hole through the external thread.

2. The worm gear linear motion electric hole opening driver according to claim 1, characterized in that: The upper end of the opening head is located in the inner hole of the nose cap; the upper end surface of the opening head is coplanar with the upper surface of the nose cap.

3. The worm gear linear motion electric hole opening driver according to claim 1, characterized in that: The limiting device comprises an upper limit step arranged on the inner wall of the upper part of the transmission cavity; the outer wall of the worm shaft is provided with an upper auxiliary step located below the upper limit step; An upper bearing is provided outside the worm shaft and is located between the upper limit step and the upper auxiliary step; a lower auxiliary step is provided on the outer wall of the worm shaft and is located below the upper auxiliary step; the lower auxiliary step is annular; a matching easy-to-disassemble structure is provided at the lower part of the transmission cavity; a lower bearing is provided outside the worm shaft and is located between the lower auxiliary step and the easy-to-disassemble structure.

4. The worm gear linear motion electric hole opening driver according to claim 3, characterized in that: The easy-to-disassemble structure comprises a disassembly and assembly port provided on the lower surface of the gearbox body, the disassembly and assembly port being connected with the transmission cavity; a cover plate matching the disassembly and assembly port is provided on the lower surface of the gearbox body, and the cover plate shields and seals the disassembly and assembly port; the cover plate and the gearbox body are fixed by a plurality of evenly distributed first screws; an annular embedding groove is provided on the inner wall of the disassembly and assembly port; a retaining ring matching the disassembly and assembly port is provided in the embedding groove, and the inner edge of the retaining ring protrudes inwardly into the disassembly and assembly port; a bearing sleeve is provided in the disassembly and assembly port, which is in contact with the upper surface of the inner edge of the retaining ring; an annular limiting portion is extended inwardly from the edge of the lower end port of the bearing sleeve; the lower part of the lower bearing is located in the bearing sleeve, and the lower surface of the lower bearing is in contact with the upper surface of the limiting portion.

5. The worm gear linear motion electric hole opening driver according to claim 1, characterized in that: A set of rear bearings outside the rear end of the worm is arranged in the positioning hole; the end cover and the gearbox body are fixed by a plurality of evenly distributed second screws; a set of front bearings outside the front part of the worm is arranged in the mounting hole.

6. The worm gear linear motion electric hole opening driver according to claim 1, characterized in that: The outer peripheral surface of the hole opening head is in contact with the inner wall of the shell; the lower outer wall of the hole opening head is provided with an annular guide part, and the outer peripheral surface of the guide part is in contact with the inner wall of the shell; the outer diameter of the guide part is greater than the inner diameter of the nose cap.

7. The worm gear linear motion electric hole opening driver according to claim 1, characterized in that: The outer wall of the lower end of the shell is provided with a connecting portion which fits with the upper surface of the gearbox body; the connecting portion and the gearbox body are fixed by a plurality of evenly distributed third screws.

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