CN211220555U - Electric hammer chisel locking structure of electric hammer - Google Patents

Abstract

The utility model relates to an electric hammer chisel locking structure of electric hammer belongs to electric tool technical field. Including preceding section of thick bamboo, chisel lock clutch, big awl tooth, packing ring, clutch spring, lock plate, the steel wire retaining ring for hole have set gradually in the preceding section of thick bamboo, the lock plate outer lane is provided with the lock plate screens, the preceding section of thick bamboo is provided with big size shape and lock plate screens assorted draw-in groove in the section of thick bamboo in the lock plate position, lock plate screens card in the draw-in groove in the section of thick bamboo of preceding section of thick bamboo inner wall, the lock plate inner circle is provided with lock plate face tooth, chisel lock clutch surface is provided with the clutch gib, the inside clutch transmission groove that is provided with of chisel lock clutch, clutch gib and lock plate face tooth meshing, big awl tooth is provided with big awl tooth fixture block with chisel lock clutch transmission groove contact surface, big awl tooth fixture block and clutch transmission groove meshing. The utility model discloses original locking cover structure and plastics material have been improved, the locking piece that trades for the high strength of metal material.

Description

Electric hammer chisel locking structure of electric hammer

Technical Field

The utility model relates to an electric tool technical field especially relates to an electric hammer chisel locking structure of electric hammer.

Background

At present, the structural characteristics of the electric hammer are recorded with the particularity of operation, so that the electric hammer is widely cited in the fields of construction, decoration and the like, the direction of a chisel is determined according to the determination of a chisel tool during use, the operation is generally facilitated through the fixed direction, and a chisel locking device is used. The locking device of the chisel is stopped by an eccentric pin on the rotary handle, and the braking torque is not large. Still other rock lock constructions that are used are plastic retaining sleeves that can engage the clutch to provide the retaining, but plastic retaining sleeves are susceptible to damage, which can result in failure of the rock locking function.

SUMMERY OF THE UTILITY MODEL

In view of the not enough of background art existence, the utility model relates to an electric hammer chisel locking structure of electric hammer provides a flat chisel locking structure of electric hammer, has added the locking piece, has improved on the basis of locking cover for lock the clutch of electric hammer, angle locking when having realized the flat chisel of electric hammer promptly.

The utility model relates to an electric hammer chisel locking structure of an electric hammer, which comprises a front barrel, a chisel lock clutch and a big bevel gear, a washer, a clutch spring, a stop plate and a hole steel wire retainer ring are sequentially arranged in the front cylinder, the stop piece is made of metal, a stop piece clamping edge is arranged on the outer ring of the stop piece, a clamping groove in the front barrel, the size and the shape of which are matched with the clamping edge of the stop piece, is arranged at the position of the stop piece, the locking plate clamping edge is clamped in a clamping groove in the front barrel inner wall, the locking plate inner ring is provided with locking plate face teeth, the outer surface of the chisel lock clutch is provided with a clutch clamping strip, the inner part of the chisel lock clutch is provided with a clutch transmission groove, the clutch clamping strip is meshed with the surface teeth of the stop piece, a large bevel gear clamping block is arranged on the contact surface of the large bevel gear and the chisel lock clutch, and the large bevel gear clamping block is meshed with the clutch transmission groove.

By adopting the scheme, the stop sheet is made of metal, so that the stop strength is increased, and the stop sheet is not easy to damage.

Furthermore, a cylinder inner stop block is arranged on the inner side of the front cylinder and the connecting surface of the chisel lock clutch, and the hole steel wire retainer ring is positioned between the cylinder inner stop block and the stop plate.

By adopting the scheme, the structure can prevent the stop piece from sliding out of the front barrel.

Furthermore, the stop piece is connected with the stop piece spring, so that the stop piece can slide up and down along the inner wall of the front barrel, a gap is formed between the clamping edge of the stop piece and the left and right sides of the connecting and meshing surface of the clamping groove in the barrel, and the sliding range of the stop piece is from the position where the elastic deformation of the stop piece spring is shortest to the position where the stop piece is blocked by the stop block in the barrel.

Through adopting above-mentioned scheme, the effect of scheme plays the cushioning effect when chisel lock clutch is connected with the inner tube, matches according to the structure of clutch gib and locking plate face tooth during the buffering to accomplish the intermeshing of clutch gib and locking plate face tooth, accomplish the locking.

Furthermore, a clutch clamping strip on the outer surface of the chisel lock clutch is in a slope shape, and the thickness of the clutch clamping strip close to the front barrel is gradually reduced.

By adopting the scheme, the structure can facilitate the clutch clamping strip to smoothly slide into the gap of the stop plate face teeth, so that the clutch clamping strip and the stop plate face teeth can be successfully meshed even if the clutch clamping strip is not aligned.

Furthermore, the front barrel is connected with the chisel lock clutch and is provided with four screw holes, and the screw holes are provided with hexagon socket head cap screws and spring washers.

By adopting the scheme, the screw hole is used for penetrating the screw, and the inner hexagonal socket head cap screw and the spring washer can effectively fix the front barrel on the electric hammer.

Further, still be provided with the cylinder in the middle of the preceding section of thick bamboo, chisel lock clutch, big awl tooth are located the cylinder outside, chisel lock clutch is located cylinder separation and reunion portion, big awl tooth is located the big awl tooth portion of cylinder.

By adopting the scheme, the chisel lock clutch and the large bevel gear have a common shaft, and the connection is convenient. The motor is provided with an intermediate shaft, the intermediate shaft drives the air cylinder to rotate, and the air cylinder rotates to drive the chisel lock clutch and the large bevel gear to rotate.

Further, cylinder separation and reunion portion still is provided with the parallel key, the parallel key shape is the fillet rectangle, the inside flat keyway that is provided with of chisel lock clutch, the parallel key meshes with the parallel keyway mutually.

By adopting the scheme, the flat key transfers torque by the side surface, has good centering performance and is convenient to assemble and disassemble.

Furthermore, the chisel lock clutch moves to the position far away from the large bevel gear along the surface of the cylinder, so that the clutch clamping strip is not attached to the surface teeth of the stop plate, and the large bevel gear clamping block enters a neutral position state when not engaged with the clutch transmission groove.

By adopting the scheme, the chisel locking structure can be placed in a neutral position state, so that the clutch clamping strip is not attached to the surface teeth of the stop plate, and the large bevel gear clamping block is not meshed with the clutch transmission groove. And thus will not lock.

Furthermore, the chisel lock clutch moves to the position far away from the large bevel gear along the surface of the cylinder, so that the clutch clamping strip is attached to the surface teeth of the stop plate, and the clutch enters a non-neutral state.

Through adopting above-mentioned scheme, the locking is accomplished in the laminating of clutch gib and locking plate face tooth for the flat chisel angle of electric hammer can not change.

Further, the cylinder adopts double-acting cylinder, the cylinder surface is provided with the piston, the piston is provided with the piston rod hole.

By adopting the scheme, the air blowby between the left cavity and the right cavity caused by pressure in the air cylinder is effectively prevented.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic top view of embodiment 1 of the present invention.

Fig. 2 is an explosion structure diagram of embodiment 1 of the present invention.

Fig. 3 is a schematic structural view of a stopper according to embodiment 1 of the present invention.

Fig. 4 is a schematic structural view of a front barrel according to embodiment 1 of the present invention.

Fig. 5 is a schematic structural view of the clutch and the large cone teeth of embodiment 1 of the present invention.

Fig. 6 is a schematic view of the cylinder structure of embodiment 1 of the present invention.

Reference numerals, 1-front cylinder, 2-chisel lock clutch, 3-big bevel gear, 4-washer, 5-clutch spring, 6-stop plate spring, 7-stop plate, 8-hole wire retainer ring, 9-screw hole, 10-cylinder, 11-cylinder internal clamping groove, 12-cylinder internal stopper, 21-clutch clamping strip, 22-clutch transmission groove, 23-flat key groove, 31-big bevel gear clamping block, 71-stop plate clamping edge, 72-stop plate face tooth, 91-internal hexagonal socket head screw, 92-spring washer, 101-cylinder clutch part, 102-cylinder big bevel gear part, 103-flat key, 104-piston, 105-piston rod hole.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described and discussed below with reference to the accompanying drawings of the present invention, and it is obvious that only some examples, not all examples, of the present invention are described herein, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.

For the convenience of understanding the embodiments of the present invention, the following detailed description will be given by way of example with reference to the accompanying drawings, and the embodiments are not limited to the embodiments of the present invention.

Embodiment 1 of the utility model refers to fig. 1, fig. 2, fig. 6 and shows, relates to an electric hammer chisel locking structure of electric hammer, and this structure has the advantage that intensity is high, durable, not fragile. It includes preceding section of thick bamboo 1, chisel lock clutch 2, big awl tooth 3, cylinder 10, be provided with packing ring 4, clutch spring 5, locking plate spring 6, locking plate 7, the wire retainer ring 8 for the hole in the preceding section of thick bamboo 1, big awl tooth 3 is located cylinder 10, but free rotation, chisel lock clutch 2 and cylinder 10 are through flat key 103 hookup, the flat key 103 that shows meshes with the flat keyway 23 on the chisel lock clutch 2, through flat key 103, chisel lock clutch 2 can be axial motion above cylinder 10. Under the action of the switching clutch spring 5, the large bevel gear fixture block 31 is in contact with the clutch transmission groove 22, and transmits relative torque.

Referring to fig. 3, the locking plate 7 includes a locking plate rib 71 and a locking plate face tooth 72, the locking plate 7 has higher strength than the original design, and is made of metal, the locking plate 7 can move axially freely in the front barrel 1, under the action of the switching locking plate spring 6, the locking plate 7 is connected with the step face of the electric hammer, so that the locking plate 7 is not in contact with the chisel lock clutch 2, and the locking plate 7 is connected with the slipping chisel lock clutch 2, so that the locking plate face tooth 72 is engaged with the clutch gib 21, and transmits the returned passive torque.

Referring to fig. 1, 3, 4 and 5, the clutch locking bar 21 is in a slope shape, the thickness of the clutch locking bar 21 gradually decreases toward the front barrel 1, an in-barrel stopper 12 is arranged on the barrel inner side of the connecting surface of the front barrel 1 and the chisel lock clutch 2, and the stopper piece 7 is located in the front barrel 1 and between the stopper piece spring 6 and the in-barrel stopper 12. The above structure is advantageous for engagement of the chisel lock clutch 2 with the front barrel 1. When the chisel lock clutch 2 slides to the front barrel 1, even if the clutch clamping bar 21 is not aligned with the stop piece face tooth 72, the self-adapting adaptation can be carried out according to the buffer of the stop piece spring 6 and the slope shape of the clutch clamping bar 21, and the clutch clamping bar can smoothly slide into the stop piece face tooth 72 to be successfully engaged with the stop piece face tooth.

The working principle of the electric hammer is as follows:

hammer shelves theory of operation: the motor of the electric hammer generates power, the power is transmitted to the eccentric shaft through the transmission gear, the connecting rod drives the air compressing piston to move towards the direction of the output drill bit, air between the air compressing piston and the impact piston is compressed, and when the air is compressed to the air pressure which is enough to overcome the friction force between the impact piston and the air cylinder, the impact piston starts to move forwards to impact the impact hammer to move forwards. At this point, since the speed of the impact piston is still greater than the speed of the impact hammer, the compression space is further compressed and the impact hammer is accelerated. When the inflating piston passes through the small hole on the cylinder 10, the compressed air is communicated with the outside, the pressure is eliminated, and the impact piston continues to move forwards to the tail end of the impact hammer by means of inertia. When the impact piston collides with the tail end of the impact hammer and rebounds to a position beyond the air hole to close the air hole, the air compression piston is also in a return stroke state. Since the speed of the piston is now greater than the speed of the percussion hammer, a negative pressure is formed in the air chamber of the cylinder 10, which brings the percussion piston back to the starting position by means of the negative pressure. Continuous impact is thus formed in cycles.

The electric drill has the functional working principle that: the motor drives the cylinder 10 to rotate via a reduction gear and a pair of bevel gears. The cylinder 10 drives the big bevel gear 3 to rotate, the big bevel gear clamping block 31 of the big bevel gear 3 is meshed with the clutch transmission groove 22, the chisel lock clutch 2 is driven to rotate through meshing, and the front barrel 1 is driven to rotate through the chisel lock clutch 2, so that the drill bit is driven to rotate.

Angle gear operating principle: when the chisel lock clutch 2 is slid into the front barrel 1, the locking is completed by the engagement of the clutch catch 21 with the stop plate face teeth 72, so that the angle of the chisel is determined.

Referring to fig. 4, the front barrel 1 is provided with four screw holes 9, the screw holes 9 are matched with screw holes 9 of an inner hexagonal socket head cap screw 91, and a matched spring washer 92 is fixed on the electric hammer shell.

Referring to fig. 6, the cylinder 10 is a double acting cylinder, alternately supplying air from both sides of the piston 104, outputting force in one or both directions. The piston 104 is a pressurized part in the cylinder 10. In order to prevent the air leakage between the left cavity and the right cavity of the piston 104, a piston sealing ring is arranged. The wear-resistant ring on the piston 104 can improve the guidance of the cylinder 10, reduce the abrasion of the piston seal ring and reduce the frictional resistance. The wear-resistant ring is made of polyurethane, polytetrafluoroethylene, cloth-sandwiched synthetic resin and the like. The width of the piston 104 is determined by the seal ring size and the necessary sliding portion length. The sliding part is too short, which easily causes early wear and seizure. The piston 104 is made of aluminum alloy or cast iron.

The above description is only an embodiment of the present application, and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the scope and spirit of the present application shall be included in the scope of the claims of the present application.

Claims (10)

1. The utility model provides an electric hammer chisel locking structure of electric hammer which characterized in that: comprises a front barrel (1), a chisel lock clutch (2) and a large bevel gear (3), wherein a gasket (4), a clutch spring (5), a stop plate spring (6), a stop plate (7) and a steel wire retainer ring (8) for a hole are sequentially arranged in the front barrel (1), the stop plate (7) is made of metal, a stop plate clamping edge (71) is arranged on the outer ring of the stop plate (7), a barrel inner clamping groove (11) with a size shape matched with the stop plate clamping edge (71) is arranged at the position of the stop plate (7) of the front barrel (1), the stop plate clamping edge (71) is clamped in a barrel inner clamping groove (11) on the inner wall of the front barrel (1), a stop plate face tooth (72) is arranged on the inner ring of the stop plate (7), a clutch clamping strip (21) is arranged on the outer surface of the chisel lock clutch (2), a clutch transmission groove (22) is arranged inside the chisel lock clutch (2), clutch gib (21) and locking plate face tooth (72) meshing, big awl tooth (3) and chisel lock clutch (2) contact surface are provided with big awl tooth fixture block (31), big awl tooth fixture block (31) and clutch transmission groove (22) meshing.

2. An electric hammer drill locking structure of an electric hammer according to claim 1, wherein: an inner cylinder stop block (12) is arranged on the inner side of the front cylinder (1) and the connecting surface of the chisel lock clutch (2), and a steel wire check ring (8) for the hole is positioned between the inner cylinder stop block (12) and the stop piece (7).

3. An electric hammer drill locking structure of an electric hammer according to claim 2, wherein: the stop piece (7) is connected with the stop piece spring (6) so that the stop piece (7) can slide up and down along the inner wall of the front barrel (1), a gap is reserved on the left and right of the connecting and meshing surface of the stop piece clamping edge (71) and the barrel inner clamping groove (11), and the sliding range of the stop piece (7) is from the shortest elastic deformation position of the stop piece spring (6) to the position where the stop piece (7) is blocked by the barrel inner stop block (12).

4. An electric hammer drill locking structure of an electric hammer according to claim 1, wherein: the clutch clamping strip (21) on the outer surface of the chisel lock clutch (2) is in a slope shape, and the thickness of the clutch clamping strip (21) close to the front barrel (1) is gradually reduced.

5. An electric hammer drill locking structure of an electric hammer according to claim 1, wherein: the front barrel (1) and the chisel lock clutch (2) are connected and are provided with four screw holes (9), and the screw holes (9) are provided with inner hexagonal socket head screws (91) and spring washers (92).

6. An electric hammer drill locking structure of an electric hammer as set forth in claim 1, 2, 3, 4 or 5, wherein: the middle of the front barrel (1) is also provided with a cylinder (10), the chisel lock clutch (2) and the large bevel gear (3) are located on the outer side of the cylinder (10), the chisel lock clutch (2) is located on a cylinder clutch part (101), and the large bevel gear (3) is located on a cylinder large bevel gear part (102).

7. An electric hammer drill locking structure of an electric hammer according to claim 6, wherein: the cylinder clutch portion (101) is further provided with a flat key (103), the flat key (103) is in the shape of a round rectangle, a flat key groove (23) is formed in the chisel lock clutch (2), and the flat key (103) is meshed with the flat key groove (23).

8. An electric hammer drill locking structure of an electric hammer according to claim 6, wherein: the chisel lock clutch (2) moves to the position far away from the large bevel gear (3) along the surface of the cylinder (10), so that the clutch clamping strip (21) is not attached to the stopper piece face teeth (72), and when the large bevel gear clamping block (31) is not meshed with the clutch transmission groove (22), the clutch enters a neutral position state.

9. An electric hammer drill locking structure of an electric hammer according to claim 6, wherein: the chisel lock clutch (2) moves to a position far away from the large bevel gear (3) along the surface of the cylinder (10), so that the clutch clamping strip (21) is attached to the surface teeth (72) of the stop plate, and the clutch enters a non-neutral state.

10. An electric hammer drill locking structure of an electric hammer according to claim 6, wherein: the air cylinder (10) adopts a double-acting air cylinder, a piston (104) is arranged on the surface of the air cylinder (10), and a piston rod hole (105) is formed in the piston (104).

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