Electric hammer with protective structure and method of use

Abstract

The present application relates to electric hammer device field, specifically to a kind of electric hammer with protection structure and use method, including front cover, middle cover and drill bit, the drill bit and the middle cover are arranged in the both ends of the front cover, the output shaft of the drill bit is supported in the middle part of the front cover, the other end of the output shaft is connected with transmission shaft, it further includes the swing plate that coaxial sleeve is set to the outside of output shaft, two groups of side shafts that are symmetrically arranged in the inside of middle cover front and back are connected with transmission shaft and swing plate, and side shaft is used to pull swing plate transverse reciprocating swing.The present application is matched with rotating ring step groove by the top block in swing plate guide groove, and output shaft is pushed forward by first step groove in initial stage, and half combined state is formed when back, and deviation is reduced;Spring top pressure top block gradually switches step groove engagement, and finally lock pin is clamped into lock hole to complete hard connection, and eliminate empty stroke error;Taper sleeve is compressed spring closed with drilling depth, and dustproof is opened automatically when spring resets when drilling, and synchronously guarantee visibility and dust barrier.

Description

Technical Field

[0001] This invention relates to the field of electric hammer equipment, and more specifically to an electric hammer with a protective structure and its usage method. Background Technology

[0002] A hammer drill is a multi-functional power tool whose core function is to efficiently drill and lightly demolish hard materials such as concrete, brick, and natural stone through a combination of rotation and impact motion. Typical applications include drilling expansion bolt holes and excavating trenches for water and electricity pipes in building renovations, fixing curtain wall framing or installing rebar, and it is also suitable for installing shelves in homes and drilling through beams in engineering projects. Due to the special structure of the hammer drill, compared to an electric drill, its main function to achieve faster impact drilling is to add an impact action while drilling. However, because the impact action is achieved through the drill bit... In the initial drilling positioning process, the drill bit contacts the drilling point. When the drill bit is turned on for rotation and reciprocating impact, the retraction action causes the drill bit to temporarily detach from and shift from the positioning point. This results in momentary slippage between the drill bit and the surface of the drilling material. This is especially noticeable on smooth surfaces, where the drill bit's retraction jump is more pronounced. In the early stages of drilling, this creates a periodic empty stroke that detaches from the contact surface, causing positioning deviation. As a result, operators need to check the alignment of the drill bit with the drilling point in real time, making it impossible to install dust covers or other protective structures, which is inconvenient to use. Summary of the Invention

[0003] The purpose of this invention is to provide an electric hammer with a protective structure and a method of use to solve the above-mentioned problems. The top block in the guide groove of the swing disk cooperates with the stepped groove of the rotating ring. In the initial stage, the first stepped groove pushes the output shaft forward. When retracting, it forms a semi-engaged state to reduce offset. The spring presses the top block to switch the engagement of the stepped grooves step by step. Finally, the locking pin is engaged in the locking hole to complete the hard connection and eliminate the error of empty stroke. The cone sleeve compresses the spring as it drills to close the cover to prevent dust. When retracting the drill, the spring resets and automatically opens the cover, simultaneously ensuring visibility and dust blocking. See the following description for details.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] The present invention provides an electric hammer with a protective structure, including a front cover, a middle cover and a drill bit. The drill bit and the middle cover are arranged at both ends of the front cover. An output shaft supporting the drill bit is provided in the middle of the front cover. The other end of the output shaft is connected to a transmission shaft. The front cover also includes a swing disk coaxially sleeved to the outside of the output shaft. Two sets of side shafts that drive the transmission shaft and the swing disk are symmetrically arranged on the front and rear sides inside the middle cover. The side shafts are used to pull the swing disk to swing laterally back and forth.

[0006] A rotating ring is rotatably sleeved on the outer side of the output shaft. The swing disk is clearance-fitted with the rotating ring. Multiple guide grooves extending radially are arranged around the inner side of the swing disk. A top block is slidably arranged in each of the multiple guide grooves. The top block has a stepped groove on the side near the axis of the swing disk that engages with the outer circumference of the rotating ring. Multiple top blocks have receiving grooves with built-in springs on their outer sides. The springs are used to keep the stepped groove side of the top block pressed against the rotating ring.

[0007] Preferably, the outer circumference of the swing disk is provided with a plurality of traction holes corresponding to and communicating with the guide groove. The receiving groove inside the spring is fixed with a traction rope passing through the traction hole. An adjusting ring is coaxially sleeved on the outer circumference of the swing disk. The outer ends of the plurality of traction ropes are all fixed to the inner wall of the adjusting ring. The adjusting ring is used to rotate and pull the plurality of traction ropes, thereby driving the plurality of top blocks to slide outward synchronously along the guide groove.

[0008] Preferably, the top block has auxiliary grooves on both sides that slide to fit the guide groove. The stepped groove includes multiple stepped blocks that are inclined in a stepped shape. A locking pin is fixed in the middle of the uppermost set of stepped blocks. The outer circumference of the rotating ring is provided with a locking hole for accommodating the locking pin for insertion and locking.

[0009] Preferably, the outer circumference of the output shaft is fixed with two sets of retaining edges arranged on both sides of the rotating ring. The retaining edges are used to install thrust bearings that support the rotation of the rotating ring. The upper and lower sides of the middle cover are vertically penetrating with operating ports, and the front and rear sides of the middle cover are vertically penetrating with rotating holes that support the rotation of the side shaft. The side of the middle cover away from the front cover is provided with a tail cover that supports the rotation of the drive shaft. The upper and lower sides of the end face of the tail cover are provided with support rods that are horizontally fixed to the middle cover and the front cover. The upper and lower sides of the swing disk are fixed with vertically extending support lugs, and the support lugs and the support rods are horizontally slidingly engaged.

[0010] Preferably, the swing disk has a rotating lug at one end near the side shaft, and the output shaft has a laterally extending connecting groove at the end away from the drill bit. A connecting rod is fixed to the end of the transmission shaft and extends laterally into the connecting groove. The longitudinal section of the connecting rod and the connecting groove is a regular polygon that is laterally sliding and adaptable. The connecting rod and the connecting groove laterally slide to form a transmission mechanism that drives the output shaft to rotate. A transmission gear is coaxially fixed in the middle section of the transmission shaft, and a side gear that meshes with the transmission gear is fixed to the end of the side shaft. A swing arm is rotatably connected to the eccentric end face of the side gear, and the other end of the swing arm is connected to the swing disk through the rotating lug.

[0011] Preferably, a drive shaft is rotatably mounted inside the tail cover below the drive shaft, a drive motor is fixed to the outside of the tail cover, the output end of the drive motor extends into the tail cover and is fixed with a motor gear, and a drive gear and an intermediate gear are coaxially fixed to the outside of the drive shaft, the drive gear meshes with the motor gear, and the intermediate gear meshes with the transmission gear.

[0012] Preferably, a protective frame extending to the outside of the drill bit is fixed to the outer side of the front cover. The protective frame includes a fixing ring fixed to the end face of the front cover and having an inner diameter larger than the overall diameter of the drill bit. A slide rod extends laterally through the outer side of the fixing ring. A conical sleeve is fixed to the outer end of the slide rod to accommodate the end of the drill bit coaxially extending into it. An observation port is vertically penetrating the top side of the conical sleeve. A compression spring is fitted on the outer side of the slide rod and pressed against the end face of the fixing ring.

[0013] Preferably, the slide rod and the fixed ring are fitted with a clearance, and an opening and closing cover for closing the observation port is provided above the cone sleeve. A rotating part that is hinged to the cone sleeve is fixed on the outer side of the bottom edge of the opening and closing cover. A pull rope is connected to the top side of the opening and closing cover, and a positioning hook is fixed on the top side of the fixed ring. The other end of the pull rope is hooked to the outside of the positioning hook to pull the opening and closing cover to flip it up.

[0014] Preferably, an upper handle is provided above the tail cover, and a vertically extending disassembly rod is fixed at the bottom end of the upper handle. A frame-shaped limiting seat is fixed on the top side of the tail cover, and a disassembly sleeve is fixed on the top side of the limiting seat to accommodate the vertical insertion of the disassembly rod. The disassembly rod is inserted into the limiting seat, and a disassembly nut is threaded at the bottom end of the disassembly rod to prevent the disassembly rod from coming out of the limiting seat. A side handle is detachably connected to the outside of the middle cover.

[0015] The method of using the electric hammer with a protective structure includes the following steps:

[0016] a. Positioning of impact drilling in the designated area: Hold the upper handle and the side handle respectively, and place the drill bit against the desired drilling point. At this time, the outer end face of the cone sleeve is flat against the surface of the drilling position, completing the pre-positioning action.

[0017] b. Drill bit rotation action: The drive motor drives the drive shaft to rotate, and the intermediate gear of the drive shaft drives the transmission shaft to rotate continuously. Due to the lateral sliding fit between the connecting rod at the end of the transmission shaft and the connecting groove of the output shaft, the rotational power of the transmission shaft is synchronously transmitted to the output shaft, thereby realizing the rotational drilling action of the drill bit driven by the output shaft.

[0018] c. Synchronous Lateral Reciprocating Impact Motion of the Drill Bit: The transmission gear on the drive shaft drives the side gear to rotate. The side gear, supported by the side shaft, drives the swing arm connected to its eccentric part to swing laterally. The swing arm pulls the swing disk under the lateral constraint of the support rod to achieve the lateral reciprocating swing process. The stepped groove of the top block serves as the lateral transmission component between the swing disk and the rotating ring on the output shaft. The innermost set of stepped blocks in the stepped groove is the first set, counting outwards. In the initial state, the first set of stepped grooves is pressed against the end face of the rotating ring, and the forward movement is the translation of the swing disk towards the front cover. The stroke is the retraction stroke when the swing disk moves horizontally towards the rear cover. When the swing disk drives the top block to push the rotating ring towards the front cover using the first set of stepped grooves, the rotating ring drives the rotating output shaft to support the drill bit to impact and drill into the drilling position. The first forward stroke is completed. After that, the swing arm pulls the swing disk back. Due to the friction of the hole wall when the drill bit enters the drilling area, the drill bit is stationary during the first retraction stroke of the swing disk. That is, at this time the first set of stepped blocks retracts, but the rotating ring does not retract. The swing disk and the output shaft are in a semi-engaged transmission state.

[0019] d. When the first set of stepped blocks in the stepped groove retracts to the rotating ring that is offset from the output shaft, the supporting force of the outer circumference of the rotating ring on the first set of stepped blocks disappears. The spring on the outer side of the top block presses the top block to slide along the guide groove towards the axis. The second set of stepped blocks abuts against the outer side of the rotating ring that has not retracted. The first retraction stroke ends and the second forward stroke begins. At this time, multiple second sets of stepped blocks that are abutted against the outer side of the rotating ring are used to impact and drill into the rotating output shaft and the drill bit. By operating the above steps, when the last set of stepped blocks slides along the guide groove and abuts against the outer side of the rotating ring during the retraction stroke, the locking pin of the set of stepped blocks is engaged in the locking hole of the rotating ring to complete the hard connection action between the stepped groove of the inner transmission component of the swing disk and the rotating ring of the outer transmission component of the output shaft. After that, the forward stroke and retraction stroke of the output shaft and the swing disk are synchronized to complete the step-by-step impact drilling action of the drill bit in the initial stage of drilling.

[0020] e. When the drill bit enters the drilling area, the distance between the cone sleeve and the front cover gradually decreases, the pressure spring is compressed, the pull rope tightening the opening and closing cover gradually loosens, the opening and closing cover is released from the tension state, and then the opening and closing cover automatically closes after the drill bit enters the drilling area. When the drill bit is withdrawn from the drilling area, the pressure spring pushes the cone sleeve to reset, and the distance between the cone sleeve and the positioning hook expands again to tighten the pull rope and automatically open the opening and closing cover, making it convenient to check the drilling position.

[0021] The beneficial effects are as follows: 1. This invention ensures drilling positioning accuracy through a semi-engaged impact transmission position. Multiple radially extending guide grooves are set on the oscillating disk, with top blocks slidingly positioned within the grooves. The stepped groove on the side of the top block closest to the oscillating disk axis engages with the rotating ring on the outer side of the output shaft, forming a staged impact structure. In the initial drilling stage, when the oscillating disk drives the top block to push the rotating ring towards the front cover using the first set of stepped grooves, the rotating ring drives the rotating output shaft to support the drill bit as it impacts and drills into the drilling position. When the oscillating disk retracts, due to the friction of the hole wall as the drill bit penetrates the drilling area, the first set of stepped blocks retracts while the rotating ring does not, and the oscillating disk and output shaft are in a semi-engaged transmission state.

[0022] 2. After drilling to the positioning point, a hard connection for transmission is achieved. When the first set of stepped blocks retracts to the offset rotating ring, the spring-loaded top block slides along the guide groove towards the axis, causing the second set of stepped blocks to abut against the outside of the rotating ring. This process continues step by step. When the last set of stepped blocks slides along the guide groove and abuts against the outside of the rotating ring during its retraction stroke, the locking pin engages in the locking hole of the rotating ring, completing the hard connection between the swing disk and the output shaft. At this point, the swing disk, output shaft, and drill bit achieve synchronous lateral sliding reciprocating impact action, resolving the positioning misalignment problem.

[0023] 3. To ensure dust prevention while improving drilling accuracy, the protective frame fixed to the outside of the front cover includes a retaining ring, a sliding rod, a tapered sleeve, and a compression spring. The tapered sleeve accommodates the coaxial insertion of the drill bit end. As the drill bit enters the drilling area, the distance between the tapered sleeve and the front cover gradually decreases, the compression spring on the outside of the sliding rod is compressed, and the pull rope tightening the opening and closing cover gradually loosens. The opening and closing cover automatically closes after the tension is released, preventing dust from escaping. When the drill bit is withdrawn from the drilling area, the spring pushes the tapered sleeve back to its original position, the distance between the tapered sleeve and the positioning hook widens again, and the pull rope tightens, automatically opening the opening and closing cover. This allows the operator to easily check the drilling position, achieving a good balance between dust prevention and visibility. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a front view structural diagram of the present invention;

[0026] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0027] Figure 3 This is a structural breakdown diagram of the present invention;

[0028] Figure 4 This is a three-dimensional structural diagram of the front cover of the present invention;

[0029] Figure 5 This is a three-dimensional structural schematic diagram of the tail cap of the present invention;

[0030] Figure 6 This is a three-dimensional structural schematic diagram of the drill bit of the present invention;

[0031] Figure 7 This is a three-dimensional structural schematic diagram of another aspect of the present invention;

[0032] Figure 8 This is a structural disassembly diagram of the output shaft of the present invention;

[0033] Figure 9 This is a three-dimensional structural schematic diagram of the swing disk of the present invention;

[0034] Figure 10 This is a three-dimensional structural schematic diagram of the top block of the present invention;

[0035] Figure 11 This is a structural disassembly diagram of the output shaft of the present invention;

[0036] Figure 12 This is a structural disassembly diagram of the side shaft of the present invention;

[0037] Figure 13 This is a left-side view of the cover structure in this invention;

[0038] Figure 14 This is the present invention. Figure 13 Structural cross-sectional view at point AA;

[0039] Figure 15 This is the present invention. Figure 14 Enlarged view of the structure at point B.

[0040] The annotations in the attached figures are explained as follows:

[0041] 1. Front cover; 101. Sliding hole; 102. Side hole; 2. Middle cover; 201. Operating port; 202. Rotating hole; 3. Tail cover; 301. Support rod; 302. Limit seat; 303. Disassembly sleeve; 4. Drill bit; 5. Output shaft; 501. Rotating ring; 502. Locking hole; 503. Stop edge; 504. Connecting groove; 6. Swing disc; 601. Guide groove; 602. Traction hole; 603. Top block; 603a. Auxiliary groove; 604. Stepped groove; 605. Locking pin; 606. Adjusting ring; 607. Support lug; 608. Receiving groove; 608a. Spring; 608b. Traction rope ; 609. Rotating ear; 7. Side shaft; 701. Side gear; 702. Swing arm; 703. Swing shaft; 8. Transmission shaft; 801. Connecting rod; 802. Transmission gear; 9. Drive shaft; 901. Drive gear; 902. Intermediate gear; 10. Drive motor; 10a. Motor gear; 11. Protective frame; 11a. Fixing ring; 11b. Slide rod; 11c. Conical sleeve; 11d. Observation port; 11e. Compression spring; 12. Side grip; 13. Upper grip; 13a. Disassembly rod; 13b. Disassembly nut; 14. Opening and closing cover; 14a. Rotating part; 15. Pull rope; 16. Positioning hook. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0043] See Figures 1-15 As shown, this invention provides an electric hammer with a protective structure, including a front cover 1, a middle cover 2, and a drill bit 4. The drill bit 4 and the middle cover 2 are located at opposite ends of the front cover 1. An output shaft 5 supporting the drill bit 4 is disposed in the middle of the front cover 1, and the other end of the output shaft 5 is connected to a transmission shaft 8. The transmission shaft 8 is used to support the output shaft 5 and drive the drill bit 4 to rotate. It also includes a swing disk 6 coaxially sleeved to the outside of the output shaft 5. Two sets of side shafts 7 are symmetrically arranged on the front and rear sides inside the middle cover 2, which transmit the transmission shaft 8 and the swing disk 6. The side shafts 7 convert the rotational motion into the lateral reciprocating oscillation of the swing disk 6 through an eccentric swing arm 702 mechanism. The side shafts 7 pull the swing disk 6 to oscillate laterally, providing periodic impact power to the drill bit 4.

[0044] A rotating ring 501 is rotatably sleeved on the outer side of the output shaft 5. The swing disk 6 is clearance-fitted with the rotating ring 501, and multiple guide grooves 601 extending radially are arranged around the inner side of the swing disk 6. A top block 603 is slidably arranged in each of the multiple guide grooves 601. The top block 603 has a stepped groove 604 that engages with the outer circumference of the rotating ring 501 on the side near the axis of the swing disk 6. The outer side of each of the multiple top blocks 603 is provided with a receiving groove 608 for a built-in spring 608a. The spring 608a is used to keep the stepped groove 604 side of the top block 603 pressed against the rotating ring 501. The continuous pressure of the spring 608a ensures the continuity of impact force transmission and avoids idle stroke. The rotating ring 501 and the swing disk 6 engage in stages through the stepped groove 604 to achieve progressive loading of impact energy. The multi-stage inclined design of the stepped groove 604 switches the engagement position step by step during retraction through the preload of the spring 608a, reducing the offset of the drill bit 4 from the contact surface.

[0045] As an optional implementation, the outer circumference of the swing disk 6 is provided with a plurality of traction holes 602 corresponding to the guide groove 601. The receiving groove 608 inside the spring 608a is fixed with a traction rope 608b passing through the traction hole 602. An adjusting ring 606 is coaxially sleeved on the outer circumference of the swing disk 6. The adjusting ring 606 controls the radial position of all the top blocks 603 synchronously through the traction rope 608b. The adjusting ring 606 rotates with the swing disk 6. The outer ends of the multiple traction ropes 608b are fixed to the inner wall of the adjusting ring 606. The adjusting ring 606 is used to rotate and pull the multiple traction ropes 608b, thereby driving the multiple top blocks 603 to slide outward synchronously along the guide groove 601. This ensures that the rotating adjusting ring 606 can use the traction ropes 608b to pull the multiple top blocks 603 outward synchronously, so as to adjust the stepped groove 604 to the initial position that fits with the rotating ring 501.

[0046] The top block 603 has auxiliary grooves 603a on both sides of the outer side, which are provided with sliding adapter guide grooves 601. The guiding function of the auxiliary grooves 603a ensures the stability of the movement trajectory of the top block 603 and prevents deflection and jamming. The stepped groove 604 includes multiple stepped blocks that are inclined in a stepped shape. The uppermost set of stepped blocks has a locking pin 605 fixed in the middle. The outer circumference of the rotating ring 501 is provided with a locking hole 502 for accommodating the locking pin 605 for insertion and locking. The hard connection design between the locking pin 605 and the locking hole 502 can eliminate the empty stroke of the last stepped block position retraction, so as to hard connect the output shaft 5 and the swing disk 6 in the transmission state. The outer circumference of the output shaft 5 is fixed with two sets of retaining edges 503 arranged on both sides of the rotating ring 501. The retaining edges 503 are used to install thrust bearings that support the rotation of the rotating ring 501. The bidirectional limiting structure of the thrust bearings ensures the axial stability of the rotating ring 501 and the output shaft 5 under high-speed impact. The middle cover 2 has vertically penetrating operating ports 201 on both its upper and lower sides, and vertically penetrating rotating holes 202 on both its front and rear sides to support the rotation of the side shaft 7. A tail cover 3 is located on the side of the middle cover 2 furthest from the front cover 1 to support the rotation of the drive shaft 8. Support rods 301 are provided on both the upper and lower sides of the end face of the tail cover 3, providing a horizontal connection between the middle cover 2 and the front cover 1. The support rods 301, the front cover 1, and the middle cover 2 form a rigid frame to resist lateral bending stress during impact operations. Vertically extending support lugs 607 are fixed on both the upper and lower sides of the swing disk 6. The support lugs 607 slide laterally with the support rods 301. The sliding constraint of the support lugs 607 ensures that the swing disk 6 only reciprocates along the designed direction, avoiding swaying or tilting. A sliding hole 101 is horizontally penetrating the middle of the front cover 1 to accommodate the output shaft 5. Simultaneously, a side hole 102 is provided below the sliding hole 101 to support the rotation of the drive shaft 9.

[0047] A rotating lug 609 is provided at one end of the swing disk 6 near the side shaft 7. A transversely extending connecting groove 504 is provided at the end of the output shaft 5 away from the drill bit 4. A connecting rod 801 is fixed at the end of the transmission shaft 8, which transversely passes into the connecting groove 504. The longitudinal section of the connecting rod 801 and the connecting groove 504 is a regular polygon that is laterally sliding and adaptable. The transverse sliding of the connecting rod 801 and the connecting groove 504 forms a transmission mechanism that drives the output shaft 5 to rotate. The regular polygonal structure allows axial sliding while realizing torque transmission, taking into account the dual motion requirements of rotary drilling and reciprocating impact. A transmission gear 802 is coaxially fixed in the middle section of the transmission shaft 8. A side gear 701 that meshes with the transmission gear 802 is fixed at the end of the side shaft 7. A swing shaft 703 is provided at the eccentric end face of the side gear 701. A swing arm 702 is rotatably connected to the outside of the swing shaft 703. The other end of the swing arm 702 is connected to the swing disk 6 through the rotating lug 609. The eccentricity design of the swing arm 702 makes the impact frequency match the rotation speed of the drill bit 4.

[0048] A drive shaft 9 is rotatably mounted inside the tail cover 3 below the drive shaft 8. A drive motor 10 is fixed to the outside of the tail cover 3. The output end of the drive motor 10 extends into the tail cover 3 and is fixed with a motor gear 10a. A drive gear 901 and an intermediate gear 902 are coaxially fixed to the outside of the drive shaft 9. The drive gear 901 meshes with the motor gear 10a, and the intermediate gear 902 meshes with the transmission gear 802.

[0049] A protective frame 11 extending to the outside of the drill bit 4 is fixed to the outside of the front cover 1. The protective frame 11 includes a fixing ring 11a fixed to the end face of the front cover 1 and having an inner diameter larger than the overall diameter of the drill bit 4. A slide rod 11b extends laterally through the outside of the fixing ring 11a. A tapered sleeve 11c is fixed to the outer end of the slide rod 11b to accommodate the end of the drill bit 4 coaxially extending into it. An observation port 11d is vertically penetrating the top side of the tapered sleeve 11c. A compression spring 11e is sleeved on the outside of the slide rod 11b and abuts against the end face of the fixing ring 11a. The linear compression characteristics of the compression spring 11e allow the tapered sleeve 11c to adaptively conform to the working surface with the drilling depth, maintaining a dynamic seal. The slide rod 11b and the fixing ring 11a are fitted with a clearance. An opening and closing cover 14 is provided above the cone sleeve 11c to close the observation port 11d. A rotating part 14a, which is hinged to the cone sleeve 11c, is fixed to the outer side of the bottom edge of the opening and closing cover 14. The hinge structure of the rotating part 14a ensures that the opening and closing cover 14 opens and closes smoothly and avoids jamming. A pull rope 15 is connected to the top side of the opening and closing cover 14, and a positioning hook 16 is fixed to the top side of the fixing ring 11a. The other end of the pull rope 15 is hooked to the outside of the positioning hook 16 to pull the opening and closing cover 14 upward. The linkage design between the pull rope 15 and the positioning hook 16 realizes that the observation port 11d is automatically opened when the drill is withdrawn, providing an unobstructed view.

[0050] An upper handle 13 is provided above the tail cover 3. A vertically extending removal rod 13a is fixed to the bottom end of the upper handle 13. A frame-shaped limiting seat 302 is fixed to the top side of the tail cover 3. A removal sleeve 303 is fixed to the top side of the limiting seat 302 to accommodate the vertical insertion of the removal rod 13a. The mating surface between the upper handle 13 and the removal sleeve 303 is provided with annularly distributed meshing teeth. The removal rod 13a is inserted into the limiting seat 302, and the bottom end of the removal rod 13a is threaded to prevent the removal rod 13a from coming out of the limiting seat. The detachable nut 13b of the seat 302 features an anti-loosening thread design to ensure reliable connection under high vibration conditions. Simultaneously, the nut 13b tightly engages the upper handle 13 with the detachable sleeve 303, allowing for easy adjustment of the upper handle 13's rotation angle as needed, thus accommodating users with different operating habits. Furthermore, the upper handle 13 can be locked by rotating it outwards to reduce the equipment's length, facilitating use in narrower areas. A side handle 12 is detachably connected to the outer side of the middle cover 2. The side handle 12 features a rubber shock-absorbing layer to reduce hand vibration and improve operating comfort.

[0051] The electric hammer with a protective structure described in this application utilizes a multi-stage stepped groove 604 and a top block 603 cooperation mechanism between the swing disk 6 and the rotating ring 501 to achieve synchronous lateral reciprocating motion of the drill bit 4 during impact drilling. This ensures that the instantaneous slippage caused by the drill bit's retraction during the initial positioning of the borehole is effectively offset, thereby avoiding periodic idle strokes and positioning deviations caused by the drill bit 4 disengaging from the contact surface. Furthermore, the top block 603 is continuously pre-tightened by the spring 608a, allowing it to switch gradually between multiple stepped grooves 604, achieving progressive loading and transmission of impact energy. This ensures that each impact stably drives the output shaft 5 to precisely drill into the borehole wall, while utilizing the friction of the borehole wall during drilling to keep the drill bit in a semi-engaged state during the retraction stroke, effectively reducing the impact energy loss. To address the drill bit offset problem caused by uneven impact force or recoil, a hard connection design between locking pin 605 and locking hole 502 is adopted during the impact transmission process. This eliminates the error at the last idle stroke and ensures the synchronous stability of the subsequent transmission state. At the same time, the improved scheme of this application, while maintaining the stability of the impact transmission, also takes into account the needs of dust prevention and visibility. The synergistic effect of the fixing ring 11a, sliding rod 11b, cone sleeve 11c and compression spring 11e in the structure of the protective frame 11 allows the cone sleeve 11c to adaptively conform to the working surface to form a dynamic seal as the drill bit 4 gradually drills into the drilling area. In the later stage of drilling, the observation port 11d is automatically opened by the linkage design of the pull rope 15 and the opening and closing cover 14, which facilitates real-time monitoring of the drilling status, thereby avoiding the operational inconvenience caused by the obstruction of vision caused by the traditional dustproof structure. The electric hammer with protective structure described in this application is particularly suitable for hard building materials with naturally rough surfaces and high frictional properties, such as concrete, brick, and natural stone. This ensures that each impact can stably drive the output shaft to drive the drill bit to accurately drill into the hole wall. At the same time, the frictional force of the hole wall keeps the drill bit in a semi-engaged state during the retraction stroke, thereby achieving a comprehensive technical effect of stable impact transmission, accurate positioning, and safety and efficiency.

[0052] The electric hammer with a protective structure described in this application features a reasonable overall structural design, a simple transmission mechanism, and tight fit between all components. This solves the problem of unstable positioning caused by vibration and retraction during high-speed impact drilling, while also reducing impact load and ensuring the long-term durability and safety of the equipment. Furthermore, the electric hammer with the protective structure described in this application has a wide range of applications, enabling efficient drilling and light demolition operations on hard materials such as concrete, brick, and natural stone. This significantly improves work efficiency and operator comfort, while providing precise positioning, stable impact, and reliable dust protection.

[0053] This application also discloses a method for using an electric hammer with a protective structure, including the following steps:

[0054] a. Impact drilling positioning of the set area: Hold the upper handle 13 and the side handle 12 respectively, and place the drill bit 4 against the desired drilling point. At this time, the outer end face of the tapered sleeve 11c is flat against the surface of the drilling position, and the pre-positioning action is completed.

[0055] b. Rotation of drill bit 4: The drive motor 10 drives the drive shaft 9 to rotate, and the intermediate gear 902 of the drive shaft 9 drives the transmission shaft 8 to rotate continuously. Since the connecting rod 801 at the end of the transmission shaft 8 slides laterally with the connecting groove 504 of the output shaft 5, the rotational power of the transmission shaft 8 is synchronously transmitted to the output shaft 5, so that the output shaft 5 drives the drill bit 4 to rotate and drill.

[0056] c. Synchronous lateral reciprocating impact action of drill bit 4: The transmission gear 802 of the transmission shaft 8 drives the side gear 701 to rotate. Under the support of the side shaft 7, the side gear 701 drives the swing arm 702 connected to its eccentric part to swing laterally. The swing arm 702 pulls the swing disk 6 to achieve the lateral reciprocating swing process under the lateral constraint of the support rod 301. The stepped groove 604 of the top block 603 serves as the lateral transmission component between the swing disk 6 and the rotating ring 501 on the output shaft 5. The innermost set of stepped blocks of the stepped groove 604 is the first set, counting outwards. The first set of stepped grooves 604 is initially pressed against the end face of the rotating ring 501, and the swing disk 6 moves towards the front cover 1. The forward stroke is the directional translation, and the backward stroke is the translation of the swing disk 6 towards the rear cover. When the swing disk 6 drives the top block 603 to push the rotating ring 501 towards the front cover 1 using the first set of stepped grooves 604, the rotating ring 501 drives the rotating output shaft 5 to support the drill bit 4 to impact and drill into the drilling position. The first forward stroke is completed. Then the swing arm 702 pulls the swing disk 6 back. Due to the friction of the hole wall when the drill bit 4 enters the drilling area, the drill bit 4 is stationary during the first backward stroke of the swing disk 6. That is, at this time the first set of stepped blocks retracts, but the rotating ring 501 does not retract. The swing disk 6 and the output shaft 5 are in a semi-engaged state of transmission.

[0057] d. When the first set of stepped blocks in the stepped groove 604 retracts to the rotating ring 501 offset from the output shaft 5, the supporting force of the outer circumference of the rotating ring 501 on the first set of stepped blocks disappears. The spring 608a on the outer side of the top block 603 presses the top block 603 to slide along the guide groove 601 towards the axial direction. The second set of stepped blocks abuts against and engages with the outer side of the rotating ring 501 that has not retracted. The first retraction stroke ends, and the second forward stroke begins. At this time, the multiple second set of stepped blocks engaged with the outer side of the rotating ring 501 provide support for the rotating output shaft 5 and... The drill bit 4 performs impact drilling, following the steps described above. When the last set of stepped blocks slides along the guide groove 601 and comes into contact with the outside of the rotating ring 501 during the retraction stroke, the locking pin 605 of the set of stepped blocks is engaged in the locking hole 502 of the rotating ring 501, thereby completing the hard connection action between the stepped groove 604 of the inner transmission component of the swing disk 6 and the rotating ring 501 of the outer transmission component of the output shaft 5. After that, the forward stroke and retraction stroke of the output shaft 5 and the swing disk 6 are kept synchronized, completing the step-by-step impact drilling action of the drill bit 4 in the initial stage of drilling.

[0058] e. When the drill bit 4 enters the drilling area, the distance between the tapered sleeve 11c and the front cover 1 gradually decreases, the pressure spring 11e is compressed, the pull rope 15 that tightens the opening and closing cover 14 gradually loosens, the opening and closing cover 14 is released from the tension state, and then the opening and closing cover 14 automatically closes after the drill bit 4 enters the drilling area. When the drill bit 4 is withdrawn from the drilling area, the pressure spring 11e pushes the tapered sleeve 11c back to its original position, and the distance between the tapered sleeve 11c and the positioning hook 16 widens again to tighten the pull rope 15 and thus automatically open the opening and closing cover 14 for easy viewing of the drilling position.

[0059] The top block 603 in the guide groove 601 of the swing disk 6 cooperates with the stepped groove 604 of the rotating ring 501. In the initial stage, the first stepped groove 604 pushes the output shaft 5 forward. When retracting, it forms a semi-engaged state to reduce offset. The spring 608a presses the top block 603 to switch the engagement of the stepped groove 604 step by step. Finally, the locking pin 605 is inserted into the locking hole 502 to complete the hard connection and eliminate the error of empty stroke. The tapered sleeve 11c compresses the compression spring 11e while drilling to close the opening and closing cover 14 to prevent dust. When retracting the drill, the spring 608a resets and automatically opens the cover, ensuring visibility and dust prevention at the same time.

[0060] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An electric hammer with a protective structure, comprising a front cover (1), a middle cover (2), and a drill bit (4), wherein the drill bit (4) and the middle cover (2) are respectively arranged at both ends of the front cover (1), and an output shaft (5) supporting the drill bit (4) is provided in the middle of the front cover (1), and a transmission shaft (8) is connected to the other end of the output shaft (5), characterized in that: It also includes a swing disk (6) coaxially sleeved to the outside of the output shaft (5). The inner front and rear sides of the middle cover (2) are symmetrically provided with two sets of side shafts (7) that connect the transmission shaft (8) and the swing disk (6). The side shafts (7) are used to pull the swing disk (6) to swing laterally back and forth. A rotating ring (501) is rotatably sleeved on the outer side of the output shaft (5). The swing disk (6) is in clearance fit with the rotating ring (501). The inner side of the swing disk (6) is surrounded by a plurality of guide grooves (601) extending radially therein. A top block (603) is slidably disposed in each of the multiple sets of guide grooves (601). The top block (603) is provided with a stepped groove (604) on the side near the axis of the swing disk (6) to engage with the outer circumference of the rotating ring (501). The outer side of each of the multiple top blocks (603) is provided with a receiving groove (608) for a built-in spring (608a). The spring (608a) is used to keep the stepped groove (604) side of the top block (603) pressed against the rotating ring (501).

2. The electric hammer with a protective structure according to claim 1, characterized in that: The swing disk (6) has multiple traction holes (602) on its outer circumference that correspond to and communicate with the guide groove (601). The traction rope (608b) that passes through the traction hole (602) is fixed in the receiving groove (608) inside the spring (608a). An adjusting ring (606) is coaxially sleeved on the outer circumference of the swing disk (6). The outer ends of the multiple traction ropes (608b) are all fixed to the inner wall of the adjusting ring (606). The adjusting ring (606) is used to rotate and pull the multiple traction ropes (608b) to drive the multiple top blocks (603) to slide outward synchronously along the guide groove (601).

3. The electric hammer with a protective structure according to claim 2, characterized in that: The top block (603) is provided with auxiliary grooves (603a) on both sides of the outer side, which are slidably adapted to the guide groove (601). The stepped groove (604) includes a plurality of stepped blocks that are inclinedly distributed in a stepped shape. A locking pin (605) is fixed in the middle of the uppermost set of stepped blocks. The outer circumference of the rotating ring (501) is provided with a locking hole (502) for accommodating the locking pin (605) for insertion and locking.

4. The electric hammer with a protective structure according to claim 3, characterized in that: Two sets of retaining edges (503) are fixed on the outer circumference of the output shaft (5) and arranged on both sides of the rotating ring (501). The retaining edges (503) are used to install thrust bearings that support the rotation of the rotating ring (501). The upper and lower sides of the middle cover (2) are vertically connected with operating ports (201), and the front and rear sides of the middle cover (2) are vertically connected with rotating holes (202) that support the rotation of the side shaft (7). The middle cover (2) is provided with a tail cover (3) that supports the rotation of the transmission shaft (8) on the side away from the front cover (1). The upper and lower sides of the end face of the tail cover (3) are provided with support rods (301) that are horizontally fixed to the middle cover (2) and the front cover (1). The upper and lower sides of the swing disk (6) are fixed with vertically extending support lugs (607), and the support lugs (607) and the support rods (301) are horizontally slidably engaged.

5. The electric hammer with a protective structure according to claim 4, characterized in that: The swing disk (6) is provided with a rotating lug (609) at one end near the side shaft (7), and the output shaft (5) is provided with a transversely extending connecting groove (504) at one end away from the drill bit (4). The end of the transmission shaft (8) is fixed with a connecting rod (801) that transversely penetrates into the connecting groove (504). The longitudinal section of the connecting rod (801) and the connecting groove (504) is a regular polygon that is transversely sliding and adaptable. The connecting rod (801) and the connecting groove (504) transversely slide to form a transmission mechanism in which the transmission shaft (8) drives the output shaft (5) to rotate. The transmission gear (802) is coaxially fixed in the middle section of the transmission shaft (8). The end of the side shaft (7) is fixed with a side gear (701) that meshes with the transmission gear (802). The end face of the side gear (701) is rotatably connected to a swing arm (702). The other end of the swing arm (702) is connected to the swing disk (6) through the rotating lug (609).

6. The electric hammer with a protective structure according to claim 5, characterized in that: A drive shaft (9) is rotatably mounted inside the tail cover (3) below the drive shaft (8). A drive motor (10) is fixed on the outside of the tail cover (3). The output end of the drive motor (10) extends into the tail cover (3) and is fixed with a motor gear (10a). A drive gear (901) and an intermediate gear (902) are coaxially fixed on the outside of the drive shaft (9). The drive gear (901) meshes with the motor gear (10a), and the intermediate gear (902) meshes with the transmission gear (802).

7. The electric hammer with a protective structure according to claim 1, characterized in that: A protective frame (11) extending to the outside of the drill bit (4) is fixed to the outside of the front cover (1). The protective frame (11) includes a fixing ring (11a) fixed to the end face of the front cover (1) and having an inner diameter larger than the overall diameter of the drill bit (4). A slide rod (11b) is transversely penetrating the outside of the fixing ring (11a). A conical sleeve (11c) is fixed to the outer end of the slide rod (11b) to accommodate the coaxial insertion of the end of the drill bit (4). An observation port (11d) is vertically penetrating the top side of the conical sleeve (11c). A compression spring (11e) is sleeved on the outside of the slide rod (11b) and abuts against the end face of the fixing ring (11a).

8. The electric hammer with a protective structure according to claim 7, characterized in that: The slide rod (11b) is clearance-fitted with the fixed ring (11a). An opening and closing cover (14) for closing the observation port (11d) is provided above the cone sleeve (11c). A rotating part (14a) hinged to the cone sleeve (11c) is fixed on the outer side of the bottom edge of the opening and closing cover (14). A pull rope (15) is connected to the top side of the opening and closing cover (14). A positioning hook (16) is fixed to the top side of the fixed ring (11a). The other end of the pull rope (15) is hooked to the outside of the positioning hook (16) to pull the opening and closing cover (14) to flip it up.

9. The electric hammer with a protective structure according to claim 4, characterized in that: An upper handle (13) is provided above the tail cover (3). A vertically extending disassembly rod (13a) is fixed at the bottom end of the upper handle (13). A frame-shaped limiting seat (302) is fixed on the top side of the tail cover (3). A disassembly sleeve (303) is fixed on the top side of the limiting seat (302) to accommodate the vertical insertion of the disassembly rod (13a). The disassembly rod (13a) is inserted into the limiting seat (302), and the bottom end of the disassembly rod (13a) is threaded with a disassembly nut (13b) to prevent the disassembly rod (13a) from coming out of the limiting seat (302). A side handle (12) is detachably connected to the outside of the middle cover (2).

10. The method of using the electric hammer with a protective structure according to claim 9, characterized in that, Includes the following steps: a. Positioning of the set area by impact drilling: Hold the upper handle (13) and the side handle (12) respectively, and place the drill bit (4) against the required drilling point. At this time, the outer end face of the cone sleeve (11c) is flat against the surface of the drilling position, and the pre-positioning action is completed. b. Rotation of drill bit (4): The drive shaft (9) is rotated by the drive motor (10), and the transmission shaft (8) is continuously rotated by the intermediate gear (902) of the drive shaft (9). Since the connecting rod (801) at the end of the transmission shaft (8) and the connecting groove (504) of the output shaft (5) are laterally slidingly engaged, the rotational power of the transmission shaft (8) is synchronously transmitted to the output shaft (5), thereby realizing the rotational drilling action of the drill bit (4) driven by the output shaft (5). c. Synchronous transverse reciprocating impact action of drill bit (4): The transmission gear (802) of the transmission shaft (8) drives the side gear (701) to rotate. Under the support of the side shaft (7), the side gear (701) drives the swing arm (702) connected to its eccentric part to swing laterally. The swing arm (702) pulls the swing disk (6) to achieve the transverse reciprocating swing process under the transverse constraint of the support rod (301). The stepped groove (604) of the top block (603) serves as the transverse transmission component between the swing disk (6) and the rotating ring (501) on the output shaft (5). The innermost set of stepped blocks of the stepped groove (604) is the first set, counting outwards. The first set of stepped grooves (604) is pressed against the end face of the rotating ring (501) in the initial state, and the swing disk (6) moves forward towards the cover. (1) The forward stroke is the directional translation, and the backward stroke is the translation of the swing disk (6) towards the rear cover. When the swing disk (6) drives the top block (603) to push the rotating ring (501) towards the front cover (1) using the first set of stepped grooves (604), the rotating ring (501) drives the rotating output shaft (5) to support the drill bit (4) to impact and drill into the drilling position. After the first forward stroke is completed, the swing arm (702) pulls the swing disk (6) back. The drill bit (4) is in a stationary state during the first backward stroke of the swing disk (6) due to the friction of the hole wall when it enters the drilling area. That is, the first set of stepped blocks retracts at this time, while the rotating ring (501) does not retract. The swing disk (6) and the output shaft (5) are in a semi-engaged state of transmission. d. When the first set of stepped blocks in the stepped groove (604) retracts to the rotating ring (501) that is offset from the output shaft (5), the supporting force of the outer circumference of the rotating ring (501) on the first set of stepped blocks disappears. The spring (608a) on the outer side of the top block (603) presses the top block (603) to slide along the guide groove (601) in the axial direction. The second set of stepped blocks abuts against the outer side of the rotating ring (501) that has not retracted. The first retraction stroke ends and the second forward stroke begins. At this time, the multiple second sets of stepped blocks that are engaged with the outer side of the rotating ring (501) are used to support the rotating output shaft (5) and the drill bit. (4) Perform impact drilling. Following the steps above, when the last set of stepped blocks slides along the guide groove (601) and comes into contact with the outside of the rotating ring (501) during the retraction stroke, the locking pin (605) of the set of stepped blocks is engaged in the locking hole (502) of the rotating ring (501) to complete the hard connection action between the inner transmission component stepped groove (604) of the swing disk (6) and the outer transmission component rotating ring (501) of the output shaft (5). After that, the forward stroke and retraction stroke of the output shaft (5) and the swing disk (6) are synchronized to complete the step-by-step impact drilling action of the drill bit (4) in the initial stage of drilling. e. When the drill bit (4) enters the drilling area, the distance between the cone sleeve (11c) and the front cover (1) gradually decreases, the spring (11e) is compressed, the pull rope (15) of the opening and closing cover (14) gradually loosens, the opening and closing cover (14) is released from the tension state, and then the opening and closing cover (14) automatically closes after the drill bit (4) enters the drilling area. When the drill bit (4) is withdrawn from the drilling area, the spring (11e) pushes the cone sleeve (11c) to reset, and the distance between the cone sleeve (11c) and the positioning hook (16) expands again to tighten the pull rope (15) so as to automatically open the opening and closing cover (14) for easy viewing of the drilling position.

Images