Hand-held percussion electric drill

Abstract

The application discloses a handheld impact electric drill and relates to the technical field of electric drills; specifically comprising: a shell, the shell comprising a fixedly connected mounting lower shell and a mounting upper shell, the bottom end of the mounting lower shell being integrally formed with a handle mounting cylinder; a transmission rod group, the transmission rod group being slidingly installed inside a limiting sliding cylinder, and the transmission rod group comprising an integrally formed sliding connecting rod and a connecting sliding cylinder, the end of the sliding connecting rod away from the connecting sliding cylinder being fixedly connected with a connecting light rod, the inside of the connecting sliding cylinder being fixedly installed with a strong supporting spring, and the tail end of the strong supporting spring being fixedly connected with a limiting impact sliding cylinder; the impact limiting assembly is used to freely switch the transmission rod group between a non-impact state and a fixed impact stroke state, the wear-resistant steel roller is rotated to cooperate with an impact transmission cylinder, the wear of the wear-resistant steel roller and the impact transmission cylinder during the drilling work process is reduced, the impact stroke is controllable, and the overall device is convenient for long-term use.

Description

Technical Field

[0001] This invention relates to the field of electric drill technology, and more particularly to a handheld impact drill. Background Technology

[0002] An impact drill is an electric tool that primarily uses rotary cutting, but also incorporates an impact mechanism that relies on the operator's thrust to generate impact force. It is used for drilling holes in materials such as bricks, blocks, and lightweight walls.

[0003] A search revealed Chinese patent application number 202211619635.0, which discloses a handheld impact drill, including a housing. A main motor and a fixed cylinder are fixed to the inner wall of the housing. A rotating cylinder is rotatably connected to the outer wall of the fixed cylinder. An impact mechanism is disposed inside the fixed cylinder. A main shaft is disposed on one side of the impact mechanism. A drill bit is fixed to the end of the main shaft via a drill bit holder. The output shaft of the main motor is driven to the impact mechanism via an impact transmission component and to the rotating cylinder via a rotation transmission component. The rotating cylinder is driven to the main shaft via a movable transmission component. The impact mechanism includes an active impact piston, a transitional impact piston, a driven impact piston, and a passive impact piston, which are slidably connected to the inner wall of the fixed cylinder from left to right. The main shaft is rotatably connected to the outer wall of the passive impact piston. The active impact piston is driven by the impact transmission component, and the cavity of the fixed cylinder located between the driven and passive impact pistons is filled with a liquid medium.

[0004] The impact drill in the aforementioned patent has the following shortcomings: While the impact drill uses a liquid medium as the force transmission medium between the driven and passive impact pistons, preventing direct collisions, the fluid's constant pressure within the cavity ensures that even with poor surface flatness, localized excessive stress prevents deformation. However, in actual use, the active impact piston drives the driven impact piston, which in turn pushes the impacted piston through the liquid medium, giving the drill bit impact force. The driven impact piston's thrust is unstable due to the liquid medium, resulting in an unstable impact stroke. Furthermore, the active impact piston is controlled by a rotating disc, which remains constantly moving. This means the drill bit always experiences unstable impact force during drilling, making it difficult to adjust its position and hindering long-term use of the entire device. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and propose a handheld impact drill.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: Handheld impact drills include: The housing includes a fixedly connected lower mounting shell and an upper mounting shell, and the bottom end of the lower mounting shell is integrally formed with a handle mounting cylinder; A transmission rod assembly is slidably installed inside a limiting slide cylinder. The transmission rod assembly includes an integrally formed sliding connecting rod and a connecting slide cylinder. A connecting smooth rod is fixedly connected to the end of the sliding connecting rod away from the connecting slide cylinder. A strong support spring is fixedly installed inside the connecting slide cylinder. A limiting impact slide cylinder is fixedly connected to the tail end of the strong support spring. A connecting bearing is fixedly installed inside the limiting impact slide cylinder. A positioning insert is fixedly installed on the inner wall of the connecting bearing. An impact drill bit, wherein a drill bit connector is fixedly installed at the tail end of the impact drill bit, and the drill bit connector is fixedly connected to the end of the connecting rod away from the sliding link; An impact limiting assembly includes upper and lower positioning blocks and an impact transmission cylinder. The impact transmission cylinder is fixedly installed on the outer wall of the connecting rod. Two symmetrically arranged hexagonal sliding columns are slidably installed on the top of the positioning blocks. Wear-resistant steel rollers are rotatably installed on the bottom of the hexagonal sliding columns. A mating gear is provided between the two hexagonal sliding columns, and the mating gear meshes with the two hexagonal sliding columns.

[0007] As a preferred embodiment of the present invention: the housing is provided with a drive structure, the drive structure includes a drive motor and a battery module connected by a switch, a drive bevel gear is fixedly installed at the top of the output shaft of the drive motor, the drive bevel gear is meshed with a driven bevel gear, and a limit slide is fixedly installed inside the driven bevel gear; A support frame is fixedly installed on the outer wall of the drive motor. The support frame is fixedly installed at the top of the inner cavity of the grip rod mounting cylinder. The battery module is fixedly installed at the bottom of the inner cavity of the grip rod mounting cylinder. A bottom end cap is fixedly installed at the bottom end of the grip rod mounting cylinder.

[0008] In a preferred embodiment of the present invention, a positioning bearing is fixedly installed on the outer wall of one end of the limiting slide cylinder, and a positioning mounting bracket is fixedly installed on the tail end of the positioning rod. Both the positioning bearing and the positioning mounting bracket are fixedly installed inside the lower and upper mounting shells.

[0009] As a preferred embodiment of the present invention, a guide fan is fixedly installed at one end of the connecting slide cylinder near the positioning plug rod. The inner wall of the limiting slide cylinder is provided with multiple limiting slots at equal intervals, wherein auxiliary slide bars are fixedly installed inside the multiple limiting slots. The outer wall of the sliding connecting rod is integrally formed with multiple limiting sliding arms that engage with other limiting slots at equal intervals.

[0010] Based on the aforementioned scheme: the auxiliary slide bar has an adapter mounting groove on the side near the outer wall of the sliding link, and multiple mounting pins are rotatably mounted at equal intervals on the inner wall of the adapter mounting groove, and an outer arc roller is fixedly mounted on the outer wall of the mounting pin.

[0011] In a preferred embodiment of the present invention, the two ends of the impact transmission cylinder are respectively provided with a first combined bearing and a second combined bearing. The first combined bearing and the second combined bearing have the same structure and are both installed on the outer wall of the connecting rod. An impact ring groove is formed on the outer wall of the impact transmission cylinder, and a limit ring groove is formed on the outer wall of the end of the impact transmission cylinder near the first combined bearing.

[0012] In a preferred embodiment of the present invention, two positioning mounting plates are symmetrically installed on the top of one side of the positioning insert. A limiting arm is fixedly connected to one side of the positioning mounting plate, and a connecting spring is fixedly connected to the middle of the positioning mounting plate. A limiting slide post is provided inside the connecting spring, and a limiting push plate is fixedly connected to one end of the limiting slide post.

[0013] Based on the aforementioned scheme: a limiting connecting post is provided between the two positioning mounting plates, one end of the limiting connecting post is fixedly connected to a limiting connecting arm, and the limiting connecting arm is in contact with the end face of the limiting push plate.

[0014] As a preferred embodiment of the present invention, a limiting plate is fixedly connected to the top of the outer wall of the positioning insert, and a protective flip cover is rotatably installed on one side of the upper surface of the limiting plate, and a flip cover block is fixedly connected to the bottom of one end of the protective flip cover.

[0015] In a preferred embodiment of the present invention, a protective sleeve is fixedly installed at one end of the housing cavity near the impact drill bit, the protective sleeve being sleeved around the drill bit connector, and a heat dissipation tail cover is fixedly installed at one end of the housing cavity near the positioning plug.

[0016] The beneficial effects of this invention are as follows: 1. This handheld impact drill allows the transmission rod assembly to freely switch between a non-impact state and a fixed impact stroke state through an impact limit component, enabling the working state of the impact drill bit to be changed as needed; and through the cooperation of the rotating wear-resistant steel roller and the impact transmission cylinder, the wear of the wear-resistant steel roller and the impact transmission cylinder during the drilling process is reduced, the impact stroke is controllable, and the whole device is easy to use for a long time.

[0017] 2. This handheld impact drill improves the relative sliding performance between the sliding link and the limiting slide cylinder by using the outer arc roller of the auxiliary slide bar, reducing the wear of the sliding link. In conjunction with the strong support spring that rotates synchronously with the sliding link, it improves the stability of the impact drill bit during the drilling process.

[0018] 3. This handheld impact drill, through the cooperation of the heat dissipation tail cover, ventilation slots and guide fan, can dissipate heat inside the housing in both forward and reverse rotation of the transmission rod assembly, ensuring the overall safety of the drill. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the overall assembly of the present invention; Figure 2 This is a schematic diagram of the internal structure of the lower casing of the present invention; Figure 3 This is a partial cross-sectional view of the mounting structure of the lower shell of the present invention. Figure 4 A three-dimensional structural diagram of the upper shell of the present invention; Figure 5 This is a schematic diagram of the internal component layout of the overall structure of the present invention and a partially enlarged schematic diagram thereof; Figure 6 This is a three-dimensional structural diagram of the driving structure of the present invention; Figure 7 This is a three-dimensional structural diagram of the support frame of the present invention; Figure 8 This is a three-dimensional structural schematic diagram of the auxiliary slider of the present invention and a partially enlarged schematic diagram thereof; Figure 9 This is a three-dimensional structural diagram of the transmission rod assembly of the present invention; Figure 10 For the present invention Figure 9 Enlarged structural diagram at point A; Figure 11 For the present invention Figure 9 Enlarged structural diagram at point B; Figure 12 This is a partial cross-sectional view of the transmission rod assembly of the present invention; Figure 13 For the present invention Figure 12 Enlarged structural diagram at point C; Figure 14 For the present invention Figure 12 Enlarged structural diagram at point D; Figure 15 This is a schematic diagram of the assembly structure of the impact drill bit and drill bit connector of the present invention.

[0020] In the diagram: 1. Lower housing; 2. Upper housing; 3. Grip rod mounting sleeve; 4. Heat dissipation tail cover; 5. Positioning mounting bracket; 6. Battery module; 7. Bottom end cap; 8. Protective sleeve; 9. Bearing frame sleeve; 10. Drive motor; 11. Drive bevel gear; 12. Driven bevel gear; 13. Limiting slide cylinder; 14. Positioning bearing; 15. Sliding connecting rod; 16. Connecting slide cylinder; 17. Guide fan; 18. Positioning insert rod; 19. Connecting guide rod; 20. Combined bearing one; 21. Combined bearing two; 22. Drill bit connector; 23. Impact drill bit; 24. Auxiliary slide bar; 25. Limiting slot; 26. Bearing tray; 27. Fixing sleeve; 28. Adaptor mounting slot; 29. Mounting pin; 30. Outer arc roller; 31. Positioning mounting ring; 32. Impact transmission cylinder; 33. Impact ring groove; 34. Limiting ring groove; 35. Positioning insert; 36. Limiting clamping plate; 37. Hexagonal sliding column; 38. Pressing block; 39. Limiting connecting column; 40. Limiting connecting arm; 41. Positioning mounting plate; 42. Limiting clamping arm; 43. Connecting spring; 44. Limiting sliding column; 45. Limiting push plate; 46. Protective flip cover; 47. Flip cover clamping block; 48. Control clamping ring; 49. Connecting bearing; 50. Limiting impact sliding cylinder; 51. Strong support spring; 52. Adaptive connecting groove; 53. Mounting shaft; 54. Matching gear; 55. Wear-resistant steel roller. Detailed Implementation

[0021] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] Handheld impact drill, such as Figures 1 to 15 As shown, it includes: a housing, a drive structure, a transmission rod assembly, an impact drill bit 23, and an impact limiting assembly. The drive structure, the transmission rod assembly, and the impact limiting assembly are all installed inside the housing. The impact drill bit 23 is fixedly installed at one end of the transmission rod assembly, so that the impact drill bit 23 has an impact force during the working drilling process, thereby improving the working effect of the impact drill bit 23.

[0024] Example 1: The housing includes a lower mounting shell 1 and an upper mounting shell 2 that are fixedly connected by bolts. The lower mounting shell 1 has a handle mounting cylinder 3 integrally formed at one end near the tail. A protective sleeve 8 is fixedly installed at one end of the front of the inner cavity of the housing, and a heat dissipation tail cover 4 is fixedly installed at one end of the tail of the inner cavity of the housing. The top of the upper mounting shell 2 has multiple ventilation slots, which, together with the heat dissipation tail cover 4, enable airflow and facilitate heat dissipation of components such as the drive structure.

[0025] The drive structure includes a drive motor 10 and a battery module 6 connected by a switch. The switch (not shown) is a double-control switch that can control the drive motor 10 to rotate forward, reverse, and stop. The double-control switch can also be connected in series with a leveling switch to adjust the output speed of the drive motor 10. The battery module 6 is a rechargeable battery that powers the drive motor 10 and is removable. Alternatively, it can be directly connected to an external power source via a power cord to power the drive motor 10.

[0026] A support frame 9 is fixedly installed on the outer wall of the drive motor 10, such as Figure 7 and Figure 3 As shown, the top of the support frame cylinder 9 is set as a ring, and the outer wall of the ring is integrally formed with multiple ear plates at equal intervals. The ear plates are fixed to the top of the inner cavity of the handle mounting cylinder 3 by bolts. Multiple connecting rods are welded at equal intervals at the bottom of the ring, and the bottom of the multiple sets of connecting rods are welded with the support frame.

[0027] like Figure 3 As shown, the battery module 6 is fixedly installed at the bottom of the inner cavity of the grip rod mounting cylinder 3. A bottom end cap 7 is fixedly installed at the bottom end of the grip rod mounting cylinder 3. A partition plate is integrally formed in the middle of the inner cavity of the grip rod mounting cylinder 3. A through hole is opened in the middle of the partition plate. Support arms 1 are integrally formed at equal intervals on the lower surface of the partition plate. Multiple support arms 2 are integrally formed at equal intervals on the inner wall of the bottom end of the grip rod mounting cylinder 3. The space separated by support arms 1 and support arms 2, together with the space formed by the support frame cylinder 9, facilitates heat dissipation of the battery module 6 and the drive motor 10.

[0028] A bearing tray 26 is fixedly mounted on the middle of the output shaft of the drive motor 10 by bolts. A drive bevel gear 11 is fixedly mounted on the top of the bearing tray 26. A fixing sleeve 27 is provided on the top of the drive bevel gear 11. The fixing sleeve 27 is fixedly mounted on the top of the output shaft of the drive motor 10.

[0029] The drive bevel gear 11 is meshed with the driven bevel gear 12. The driven bevel gear 12 has a limiting slide cylinder 13 fixedly installed inside. The outer wall of the limiting slide cylinder 13 is welded with a flange, which is fixedly installed on the front of the drive bevel gear 11 by bolts. The inner wall of the limiting slide cylinder 13 has multiple limiting slots 25 equidistantly opened, and the outer wall of the limiting slide cylinder 13 on the front of the flange is fixedly installed with a positioning bearing 14. The housing is provided with a bracket for fixing the positioning bearing 14.

[0030] The transmission rod assembly includes an integrally formed sliding connecting rod 15 and a connecting slide cylinder 16. The outer wall of the sliding connecting rod 15 is integrally formed with multiple limiting sliding arms at equal intervals. The limiting sliding arms are slidably installed inside the limiting slot 25, so that the sliding connecting rod 15 can rotate with the driven bevel gear 12.

[0031] A strong support spring 51 is fixedly installed inside the connecting slide 16. The tail end of the strong support spring 51 is fixedly connected to a limit impact slide 50. The limit impact slide 50 is slidably installed inside the connecting slide 16 and rotates synchronously with the connecting slide 16.

[0032] A connecting bearing 49 is fixedly installed inside the limiting impact slide 50. A positioning rod 18 is fixedly installed on the inner wall of the connecting bearing 49. A hexagonal insert is integrally formed at the tail end of the positioning rod 18. A positioning mounting bracket 5 is fixedly installed on the outer wall of the hexagonal insert. The positioning mounting bracket 5 is fixedly installed inside the lower mounting shell 1 and the upper mounting shell 2. When the limiting impact slide 50 rotates, the positioning rod 18 does not rotate with it.

[0033] A guide fan 17 is fixedly installed at one end of the connecting slide cylinder 16 near the positioning rod 18. A positioning mounting ring 31 is provided on the back of the guide fan 17 and is threaded onto the outer wall of the connecting slide cylinder 16.

[0034] The end of the sliding link 15 away from the connecting slide cylinder 16 is integrally formed with a connecting smooth rod 19. The outer wall of the connecting smooth rod 19 is equipped with a combination bearing 20 and a combination bearing 21. The combination bearing 20 and the combination bearing 21 have the same structure, each consisting of a linear bearing sleeved on the outer wall of the connecting smooth rod 19 and two rotary bearings installed on the outer wall of the linear bearing. The combination bearing 20 and the combination bearing 21 are fixedly installed inside the housing.

[0035] The tail end of the impact drill bit 23 is fixedly equipped with a drill bit connector 22. The drill bit connector 22 is located inside the protective sleeve 8 and is threadedly connected to the end of the connecting rod 19 away from the sliding connecting rod 15 and reinforced by bolts.

[0036] In this embodiment, during use, the drive motor 10 is first started by a switch, and the drive motor 10 rotates forward. This drives the driven bevel gear 12 through the meshing of the drive bevel gear 11. The driven bevel gear 12, via the limiting slide cylinder 13, drives the sliding connecting rod 15 to rotate clockwise. The sliding connecting rod 15 then drives the connecting slide cylinder 16 and the connecting smooth rod 19 to rotate synchronously. The connecting slide cylinder 16 drives the guide fan 17 to rotate synchronously, drawing in outside air through the ventilation slot and then discharging it through the heat dissipation shroud 4. This airflow accelerates the heat dissipation of the drive motor 10 and other structures. The connecting smooth rod 19 drives the impact drill bit 23 to rotate synchronously through the drill bit connector 22. The impact drill bit 23 drills a hole in the object. During drilling, the drill tip of the impact drill bit 23 first contacts the object, then... Then, a certain force is applied along the drilling direction by the gripping rod mounting cylinder 3. The object exerts a reaction force on the impact drill bit 23, which in turn causes the connecting rod 19 to move in the opposite direction of the drilling direction. The connecting rod 19 drives the sliding connecting rod 15 and the connecting slide cylinder 16 to move synchronously. The limiting impact slide cylinder 50 rotates synchronously with the connecting slide cylinder 16, but its own spatial position remains unchanged under the restriction of the positioning rod 18, compressing the strong support spring 51. When the impact drill bit 23 drills into the object, the applied external force remains constant. Under the elastic force of the strong support spring 51, the impact drill bit 23 impacts the object, so that the impact and rotary cutting are carried out synchronously in the state of no fixed impact stroke, improving the drilling effect of the impact drill bit 23.

[0037] Example 2: Based on Example 1, auxiliary slide bars 24 are fixedly installed inside several of the multiple limiting slots 25. The auxiliary slide bars 24 have a matching mounting groove 28 on the side near the outer wall of the sliding connecting rod 15. Multiple mounting pins 29 are equidistantly mounted on the inner wall of the matching mounting groove 28. An outer arc roller 30 is fixedly installed on the outer wall of the mounting pin 29. The outer arc surface of the outer arc roller 30 matches the cylindrical outer wall of the sliding connecting rod 15, which facilitates the relative sliding of the sliding connecting rod 15 and the limiting slide cylinder 13 and improves the motion stability of the transmission rod assembly.

[0038] Example 3: Based on Example 1 and Example 2, an impact limiting component is added, which allows the impact drill bit 23 to switch between a non-impact state and a fixed impact stroke state, and the drilling state can be adjusted according to the actual drilling needs.

[0039] The top of the upper shell 2 is provided with a groove for the impact limiting component. The impact limiting component includes a positioning block 35 and an impact transmission cylinder 32, which are set at the upper and lower positions. The positioning block 35 is fixedly installed on the top of the upper shell 2, and the top of the outer wall of the positioning block 35 is integrally formed with a limiting plate 36. The limiting plate 36 is fixedly connected to the upper shell 2 by bolts.

[0040] A protective flip cover 46 is rotatably installed on one side of the upper surface of the limiting plate 36. A flip cover block 47 is fixedly connected to the bottom of one end of the protective flip cover 46. A control ring 48 is fixedly connected to one side of the flip cover block 47. A slot for the flip cover block 47 is provided on the side of the upper surface of the limiting plate 36 away from the protective flip cover 46.

[0041] Both ends of the impact transmission cylinder 32 are integrally formed with connecting clips, which are fixedly installed on the outer wall of the connecting rod 19 by bolts, and the positioning block 35 is close to the combined bearing 21. The outer wall of the impact transmission cylinder 32 is provided with an impact ring groove 33, which is elliptical in shape. The distance between the two ends of the ellipse projected on the horizontal plane is the impact distance of the impact drill bit 23. A limit ring groove 34 is provided on the outer wall of the end of the impact transmission cylinder 32 that is close to the combined bearing 20.

[0042] The top of the positioning insert 35 has two hexagonal sliding grooves that pass through the positioning insert 35. The positioning insert 35 has an adapter connection groove 52 inside. An installation shaft 53 is fixedly installed inside the adapter connection groove 52. A mating gear 54 is fixedly installed on the outer wall of the installation shaft 53.

[0043] Two symmetrically arranged hexagonal sliding columns 37 are slidably installed in the hexagonal sliding groove. A pressing block 38 is fixedly connected to the top of the hexagonal sliding column 37, and the side of the hexagonal sliding column 37 near the mating gear 54 has teeth that mesh with the mating gear 54.

[0044] The bottom of the hexagonal sliding column 37 extends to the bottom of the positioning block 35, and the bottom of the hexagonal sliding column 37 is integrally formed with a connecting column. The outer wall of the connecting column is rotatably mounted with a wear-resistant steel roller 55 through a bearing.

[0045] Two positioning mounting plates 41 are symmetrically installed on the top of one side of the positioning insert 35 by bolts. The positioning mounting plate 41 has a through hole in the middle, which passes through the positioning insert 35 and is connected to the hexagonal sliding groove.

[0046] A limiting slide post 44 is slidably installed inside the through hole. A connecting spring 43 is sleeved on the outer wall of the limiting slide post 44. The connecting spring 43 is fixedly connected to the positioning mounting plate 41. A limiting push plate 45 is fixedly connected to one end of the limiting slide post 44. A locking arm slot is opened on one side of the limiting push plate 45. A limiting locking arm 42 is fixedly connected to one side of the positioning mounting plate 41. The end of the limiting locking arm 42 is adapted to the locking arm slot.

[0047] A limiting connecting post 39 is provided between the two positioning mounting plates 41. One end of the limiting connecting post 39 is integrally formed with a connecting plate, which is fixed to the positioning insert 35 by bolts. The other end of the limiting connecting post 39 is fixedly connected to a limiting connecting arm 40, which is in contact with the end face of the limiting push plate 45.

[0048] When using this embodiment, as follows: Figure 9 , Figure 10 and Figure 14 As shown, the hexagonal slide column 37 near the combined bearing 20 is positioned slightly lower. At this time, the wear-resistant steel roller 55 at the bottom of the hexagonal slide column 37 is inside the limiting ring groove 34, and the outer wall of the wear-resistant steel roller 55 is in contact with the side wall of the limiting ring groove 34. When the impact transmission cylinder 32 rotates with the connecting rod 19, the wear-resistant steel roller 55 blocks the impact transmission cylinder 32 from moving towards the driving bevel gear 11. At the same time, the fixed combined bearing 21 limits the impact transmission cylinder 32, preventing the impact transmission cylinder 32 from moving away from the driving bevel gear 11. At this time, the impact drill bit 23 is in a non-impact state and only performs rotational cutting on the object. When the impact drill bit 23 changes to the fixed impact stroke state, first turn off the drive motor 10, then release the restriction of the corresponding limit slide pin 44 on the hexagonal slide pin 37, then press the pressing block 38 at the top of another hexagonal slide pin 37 to move the wear-resistant steel roller 55 at the bottom of the hexagonal slide pin 37 downward and insert it into the impact ring groove 33, then press the limit slide pin 44 corresponding to the hexagonal slide pin 37 to insert the limit slide pin 44 into the hexagonal slide pin 37 and make the corresponding limit locking arm 42 lock into the locking arm slot, then close the protective flip cover 46, and start the drive motor 10 again, and the impact drill bit 23 can perform drilling work with a fixed impact stroke.

[0049] Note: In the above embodiments one to three, the outer diameter of the connecting slide 16 is larger than the inner diameter of the limiting slide 13. When the impact drill bit 23 is not drilling, in the state of no fixed impact stroke, one end of the connecting slide 16 is in contact with the tail end of the limiting slide 13. In the state of no impact, the transmission rod assembly only follows the driven bevel gear 12 to rotate. In the state of fixed impact stroke, the wear-resistant steel roller 55 near the combined bearing 21 is always inside the impact ring groove 33, and the outer diameter of the wear-resistant steel roller 55 is smaller than the groove width of the impact ring groove 33.

[0050] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A handheld impact drill, characterized in that, include: The housing includes a fixedly connected lower mounting shell (1) and upper mounting shell (2). The bottom end of the lower mounting shell (1) is integrally formed with a handle mounting cylinder (3). The housing is provided with a drive structure, which includes a drive motor (10) connected by a switch. The top of the output shaft of the drive motor (10) is fixedly mounted with a drive bevel gear (11). The drive bevel gear (11) is meshed with a driven bevel gear (12). The driven bevel gear (12) is fixedly mounted with a limit slide cylinder (13). A transmission rod assembly is slidably installed inside a limiting slide cylinder (13). The transmission rod assembly includes an integrally formed sliding connecting rod (15) and a connecting slide cylinder (16). A connecting rod (19) is fixedly connected to one end of the sliding connecting rod (15) away from the connecting slide cylinder (16). A strong support spring (51) is fixedly installed inside the connecting slide cylinder (16). A limiting impact slide cylinder (50) is fixedly connected to the tail end of the strong support spring (51). A connecting bearing (49) is fixedly installed inside the limiting impact slide cylinder (50). A positioning insert (18) is fixedly installed on the inner wall of the connecting bearing (49). A positioning bearing (14) is fixedly installed on the outer wall of one end of the limiting slide cylinder (13). A positioning mounting bracket (5) is fixedly installed on the tail end of the positioning insert (18). The positioning bearing (14) and the positioning mounting bracket (5) are both fixedly installed inside the lower mounting shell (1) and the upper mounting shell (2). An impact drill bit (23) is provided with a drill bit connector (22) fixedly installed at its tail end. The drill bit connector (22) is fixedly connected to the end of the connecting rod (19) away from the sliding link (15). An impact limiting assembly includes a positioning block (35) and an impact transmission cylinder (32) arranged at the upper and lower positions. The impact transmission cylinder (32) is fixedly installed on the outer wall of the connecting rod (19). Two symmetrically arranged hexagonal sliding columns (37) are slidably installed on the top of the positioning block (35). Wear-resistant steel rollers (55) are rotatably installed on the bottom of the hexagonal sliding columns (37). A mating gear (54) is provided between the two hexagonal sliding columns (37). The mating gear (54) meshes with the two hexagonal sliding columns (37). The impact transmission cylinder (32) is provided with a first combined bearing (20) and a second combined bearing (21) at both ends. The first combined bearing (20) and the second combined bearing (21) have the same structure and are both installed on the outer wall of the connecting rod (19). The outer wall of the impact transmission cylinder (32) is provided with an impact ring groove (33), and a limit ring groove (34) is provided on the outer wall of the end of the impact transmission cylinder (32) near the first combined bearing (20). Two positioning mounting plates (41) are symmetrically installed on the top of one side of the positioning insert (35). A limiting arm (42) is fixedly connected to one side of the positioning mounting plate (41), and a connecting spring (43) is fixedly connected to the middle of the positioning mounting plate (41). A limiting slide post (44) is provided inside the connecting spring (43), and a limiting push plate (45) is fixedly connected to one end of the limiting slide post (44). A limiting connecting post (39) is provided between the two positioning mounting plates (41), and a limiting connecting arm (40) is fixedly connected to one end of the limiting connecting post (39). The limiting connecting arm (40) is in contact with the end face of the limiting push plate (45).

2. The handheld impact drill according to claim 1, characterized in that: The drive structure also includes a battery module (6) connected via a switch. The outer wall of the drive motor (10) is fixedly installed with a support frame (9), the support frame (9) is fixedly installed at the top of the inner cavity of the grip rod mounting cylinder (3), the battery module (6) is fixedly installed at the bottom of the inner cavity of the grip rod mounting cylinder (3), and a bottom end cap (7) is fixedly installed at the bottom end of the grip rod mounting cylinder (3).

3. The handheld impact drill according to claim 1, characterized in that: A flow guide fan (17) is fixedly installed at one end of the connecting slide cylinder (16) near the positioning plug (18). Multiple limiting slots (25) are equidistantly opened on the inner wall of the limiting slide cylinder (13). Auxiliary slide bars (24) are fixedly installed inside the multiple limiting slots (25). Multiple limiting sliding arms that engage with other limiting slots (25) are integrally formed on the outer wall of the sliding connecting rod (15) at equal intervals.

4. The handheld impact drill according to claim 3, characterized in that: The auxiliary slide bar (24) has an adapter mounting groove (28) on the side near the outer wall of the sliding link (15). Multiple mounting pins (29) are rotatably mounted at equal intervals on the inner wall of the adapter mounting groove (28). An outer arc roller (30) is fixedly mounted on the outer wall of the mounting pin (29).

5. The handheld impact drill according to claim 1, characterized in that: The top of the outer wall of the positioning insert (35) is fixedly connected to a limiting plate (36), and a protective flip cover (46) is rotatably installed on one side of the upper surface of the limiting plate (36). A flip cover block (47) is fixedly connected to the bottom of one end of the protective flip cover (46).

6. The handheld impact drill according to claim 1, characterized in that: A protective sleeve (8) is fixedly installed at one end of the inner cavity of the housing near the impact drill bit (23). The protective sleeve (8) is sleeved on the outside of the drill bit connector (22). A heat dissipation tail cover (4) is fixedly installed at one end of the inner cavity of the housing near the positioning plug (18).

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