Electric pick

Abstract

The invention discloses an electric pick which comprises a shell, an impact mechanism and a transmission mechanism, a gear box and a driving motor are arranged in the shell, a front straight barrel is fixedly arranged on the front portion of the gear box, an iron head is fixedly connected to the front end of the front straight barrel, an assembly hole allowing a working head to be installed in is formed in the iron head, and the impact mechanism comprises an air cylinder, a piston, a rammer and a hammer rod. The piston and the rammer are arranged in the air cylinder in a reciprocating motion mode, the piston is connected with the transmission mechanism, the hammer rod is used for bearing impact of the rammer and impacting the working head installed in the assembly hole forwards, a handle is installed on the rear portion of the shell and can move front and back relative to the shell, and a first elastic piece is supported between the handle and the shell. A front step and a rear step are arranged on the inner wall of the assembly hole, a front impact stopping sleeve, a rear impact stopping sleeve and a first buffering rubber ring are arranged between the front step and the rear step, impact of forward impact of the hammer rod and backward impact of the working head can be buffered, and the hand holding feeling is good.

Description

Technical Field

[0001] This invention relates to an electric pick, and more particularly to an electric pick with shock absorption function. Background Technology

[0002] An electric pick is based on an electric drill, but with the addition of a piston driven by an electric motor and connected by a crankshaft. This piston compresses air in a cylinder, causing the air pressure inside the cylinder to change periodically. The changing air pressure drives a hammer in the cylinder to strike the top of the drill bit repeatedly, which is equivalent to hitting the drill bit with a hammer, hence the name electric pick.

[0003] For example, patent CN211278272U discloses a buffer device installed on an electric hammer, which includes a front cylinder. An iron head is connected to one side of the front cylinder by screws. A cylinder, an impact rod, and an impact hammer are provided inside the front cylinder. One end of the impact rod is connected to the iron head, and the other end is in contact with the impact hammer. The cylinder is sleeved on the outside of the impact rod and the impact hammer. A buffer washer, a buffer rubber ring, and a buffer seat are sequentially sleeved on the impact rod. One end of the cylinder is sleeved on the outside of the buffer seat and is in contact with the iron head. The buffer washer and the buffer rubber ring are located between the impact rod and the iron head.

[0004] The aforementioned patent reduces the impact force of the impact hammer on the impact rod by setting a buffer washer, buffer rubber ring and buffer seat at the front of the impact hammer. However, after the impact rod is hit by the impact hammer, it moves forward. Even if some of the impact energy of the impact hammer is buffered in advance, the impact rod will still have a strong impact force. The impact rod hits the iron head on the front side, which can easily cause damage to the iron head, impact rod and screws. In addition, it will give the hand holding the electric hammer a strong vibration during use, affecting the feel of use. Summary of the Invention

[0005] In view of the problems that the impact rod directly hits the iron head, which can easily cause damage to the parts and give the hand a strong vibration during use, affecting the feel of use, the present invention provides an electric pickaxe.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: an electric hammer, comprising a housing, an impact mechanism, and a transmission mechanism. A gearbox and a drive motor serving as a power source are provided inside the housing. A front straight cylinder is fixed to the front of the gearbox, and the front end of the front straight cylinder extends out of the housing and is fixedly connected to an iron head by screws. The iron head has an assembly hole for inserting a working head. The transmission mechanism is at least partially disposed within the gearbox, transmitting the power of the drive motor to the impact mechanism. The impact mechanism includes a cylinder, a piston, a hammer, and a hammer rod. The piston and hammer are reciprocally disposed within the cylinder. The hammer is located in front of the piston, which is connected to the transmission mechanism. The hammer rod is located in front of the hammer and is used to withstand the impact of the hammer and strike the workpiece mounted on it. The working head inside the mounting hole is used for impact operation. The rear of the housing is equipped with a handle for holding. The handle can move back and forth relative to the housing. A first elastic element for shock absorption is supported between the handle and the housing. The inner wall of the mounting hole is provided with a front step and a rear step. The step surfaces of the front step and the rear step are arranged opposite each other. Between the front step and the rear step, there is a front stop sleeve for the working head to abut against when it retracts, a rear stop sleeve for the hammer rod to abut against when it strikes forward, and a first buffer rubber ring supported between the front stop sleeve and the rear stop sleeve. The front end of the front stop sleeve abuts against the front step, and the rear end of the rear stop sleeve abuts against the rear step. The front stop sleeve and the rear stop sleeve can move relative to each other to compress the first buffer rubber ring in the middle.

[0007] A further preferred embodiment of the present invention is as follows: an inner ring is protruding on the rear end of the front stop sleeve near the rear stop sleeve, a first buffer rubber ring is fitted on the inner ring, an outer ring is protruding on the front end of the rear stop sleeve near the front stop sleeve opposite to the first buffer rubber ring, the front and rear sides of the first buffer rubber ring abut against the rear end face of the front stop sleeve and the outer ring respectively, there is a gap between the inner ring and the rear stop sleeve for relative movement of the front stop sleeve and the rear stop sleeve, the outer ring is at least partially fitted outside the inner ring, a first abutting step is provided on the side wall of the working head for abutting against the front stop sleeve when retracting, and the part of the working head located behind the first abutting step passes through the front stop sleeve and the rear stop sleeve for being impacted by the hammer rod.

[0008] A further preferred embodiment of the present invention is as follows: A long groove is formed along the axial direction on the working head; a receiving hole communicating with the assembly hole is formed on the outer wall of the iron head; a ball-head pin for engaging with the long groove is placed in the receiving hole; a retaining spring is engaged on the outer wall of the iron head; a second abutting step is provided on the outer wall of the iron head behind the retaining spring; a front retaining ring, a rear retaining ring, a first support spring, and a sliding sleeve are fitted around the outside of the iron head; the front retaining ring abuts against the retaining spring; the rear retaining ring abuts against the second abutting step; an inner annular protrusion is provided on the inner side of the sliding sleeve, located between the front and rear retaining rings; the first support spring is supported between the rear retaining ring and the inner annular protrusion; the inner annular protrusion divides the interior of the sliding sleeve into a front groove and a rear groove; the sliding sleeve can slide back and forth along the iron head, so that the sliding sleeve has a first position and a second position; the rear retaining ring is always within the rear groove during the sliding process of the sliding sleeve. When the sliding sleeve slides to the first position, the inner annular convex edge abuts against the front retaining ring, and the front retaining ring is in the front groove. The inner annular convex edge surrounds the outside of the receiving hole to prevent the ball head pin from moving outward. The ball head pin is engaged in the long groove, locking the working head on the iron head and allowing it to move back and forth. When the sliding sleeve slides to the second position, the inner annular convex edge moves backward from the receiving hole so that the outer end of the receiving hole is opposite to the front groove.

[0009] A further preferred embodiment of the present invention is as follows: A first convex ring is provided on the rear end face of the iron head, which is inserted into the front straight cylinder; a buffer seat and a buffer washer located in front of the buffer seat are provided between the hammer rod and the hammer; the buffer seat includes two sections of seat bodies with different diameters, with a first annular step between adjacent sections; the diameter of the first section of seat body located at the front is larger than the diameter of the second section of seat body; the first section of seat body is fixed between the cylinder and the first convex ring; the second section of seat body is inserted into the cylinder; two through holes with different inner diameters are provided axially within the buffer seat; a second annular step is provided between adjacent through holes; the inner diameter of the first through hole located at the front is larger than the inner diameter of the second through hole; a second buffer washer is provided in the first through hole; the second... The rear part of the buffer rubber ring rests on the second annular step, the buffer washer is set inside the first convex ring, the front end of the buffer washer rests on the rear end face of the iron head, the rear end of the buffer washer is inserted into the first through hole and rests on the front part of the second buffer rubber ring, the outer side of the buffer washer is provided with an outer ring convex edge, the front side of the first seat away from the second seat is provided with a second convex ring, the second convex ring is inserted into the first convex ring and is opposite to the outer ring convex edge, there is a gap between the second convex ring and the outer ring convex edge for the buffer washer to move relative to the buffer seat, the rear end of the hammer rod passes through the buffer washer, the second buffer rubber ring and the buffer seat to serve as the part to bear the impact of the hammer, and the buffer washer is provided with a stop part for the hammer rod to abut when it retracts.

[0010] A further preferred embodiment of the present invention is as follows: the hammer rod includes a hammer head for impacting the working head and a tail rod fixed to the rear of the hammer head. The tail rod passes through the buffer washer, the second buffer rubber ring, and the buffer seat as the part that bears the impact of the hammer. The outer diameter of the hammer head is larger than the inner diameter of the inner hole of the buffer washer. The rear end face of the hammer head is set as a first conical surface. The front side of the buffer washer is provided with a conical hole for abutting and cooperating with the first conical surface. The front end of the inner hole of the buffer washer is connected to the conical hole. The front end face of the hammer is provided with an impact protrusion for impacting the tail rod. When the hammer pushes the hammer rod to move until the hammer head abuts against the rear stop sleeve, there is a gap between the front end face of the hammer and the rear end face of the second seat.

[0011] A further preferred embodiment of the present invention is as follows: a first limiting protrusion is provided on the inner side of the second buffer rubber ring, and a second limiting protrusion is provided on the outer side of the tail rod, wherein the outer diameter of the second limiting protrusion is larger than the inner diameter of the first limiting protrusion.

[0012] A further preferred embodiment of the present invention is as follows: the gearbox and the front straight cylinder are integrally formed; the bottom of the gearbox has a box opening; a middle cover is connected to the box opening; the middle cover, the front straight cylinder, and the gearbox are all made of aluminum; the middle cover and the gearbox enclose a gear cavity; the transmission mechanism includes a drive gear driven by a drive motor, an eccentric gear meshing with the drive gear, an eccentric pin mounted on the eccentric gear, and a connecting rod connected to the eccentric pin; the eccentric gear and the drive gear are disposed within the gear cavity; the connecting rod is connected to the piston; the eccentric pin is integrally formed with the eccentric gear; and the drive motor is disposed in the middle cylinder. Below the cover, a cooling fan is connected to the rotor shaft of the drive motor, located between the middle cover and the drive motor. An air guide shroud is provided between the motor and the cooling fan. The cooling fan is placed inside the air guide shroud and is a centrifugal fan. The air guide shroud has a first row of air vents in the circumferential direction. Several air guide ribs are provided at the bottom of the middle cover. The air guide ribs extend from the bottom of the middle cover near the front straight cylinder to the front of the cooling fan. A guide channel is formed between adjacent air guide ribs. The first row of air vents is opposite to the rear opening of the guide channel. The housing has a first air outlet located on the front side of the front opening of the guide channel.

[0013] A further preferred embodiment of the present invention is as follows: the handle is equipped with a switching element, the handle includes a gripping part for hand gripping and an upper connecting part connected to the upper end of the gripping part, the upper connecting part is used to connect to the rear part of the housing, the upper connecting part is provided with an operating element for controlling the switching element to be turned on or off, and the gripping part is covered with an outer adhesive.

[0014] A further preferred embodiment of the present invention is as follows: the housing includes a left side cover, a right side cover, a top cover, a rear cover, and a motor housing. The drive motor is installed inside the motor housing. The left side cover includes a left cover plate and a left clamping edge fixed to the front of the left cover plate. The right side cover includes a right cover plate and a right clamping edge fixed to the front of the right cover plate. The top and bottom of the left clamping edge are provided with a first connecting portion, and the first connecting portion has a first threaded hole for connecting with a screw. The top and bottom of the right clamping edge are provided with a second connecting portion corresponding to the first connecting portion, and the second connecting portion has a first connecting hole for the screw to pass through. The left side cover and the right side cover are connected to each other by a screw that passes through the first connecting hole and is threaded into the first threaded hole. The left clamping edge and the right clamping edge are assembled into a sleeve. The outer sleeve of the front straight cylinder has a left cover plate and a right cover plate surrounding the left and right sides of the gearbox, with a cavity between them for accommodating the gearbox. A top opening of the cavity is formed between the top of the left cover plate and the right cover plate, a bottom opening of the cavity is formed between the bottom of the left cover plate and the right cover plate, and a rear opening of the cavity is formed between the rear parts of the left cover plate and the right cover plate. A top cover is mounted above the left and right covers and covers the top opening and the first and second connecting parts located at the top of the outer sleeve. A motor housing is mounted below the left and right covers and covers the bottom opening and the first and second connecting parts located at the bottom of the outer sleeve. The rear cover is mounted behind the left and right covers and covers the rear opening.

[0015] A further preferred embodiment of the present invention is as follows: the upper and lower ends of the handle are connected to the rear cover via a connecting mechanism, which includes a baffle, a bolt, and a nut. The baffle is fixedly mounted on the handle and has a first through hole. A nut groove is formed inside the rear cover, and the nut is inserted into the nut groove. A second through hole communicating with the nut groove is formed on the rear side of the rear cover. The head of the bolt is placed inside the handle and passes through the first and second through holes to connect with the nut. The first elastic element is a second support spring, which is sleeved on the bolt. One end of the second support spring is supported on the baffle, and the other end is supported on a spring washer on the rear side of the rear cover. A retractable corrugated sleeve is connected between the handle and the rear cover. The corrugated sleeve is sleeved on the outside of the bolt and the second support spring, and the handle can move back and forth relative to the rear cover along the bolt.

[0016] Compared with the prior art, the advantages of this invention are that a front stop sleeve for the working head to abut against during retraction, a rear straight punch sleeve for the hammer rod to abut against during forward impact, and a first buffer rubber ring supported between the front and rear stop sleeves are provided between the front and rear stop sleeves. When the hammer rod strikes the working head installed in the assembly hole, the hammer rod can rush forward to abut against the rear stop sleeve in front. The rear stop sleeve is impacted by the hammer rod and squeezes the first buffer rubber ring forward. The first buffer rubber ring is elastically deformed by the compression and absorbs part of the kinetic energy before transferring it to the iron head, thereby buffering the forward impact of the hammer rod. After the working head hits the object, it retracts. During the retraction process, the working head strikes the front stop sleeve backward. When the anti-impact sleeve is impacted by the working head, it pushes the first buffer rubber ring backward. The first buffer rubber ring deforms elastically under compression and absorbs part of the kinetic energy before transmitting it to the iron head. This buffers the backward impact of the working head and prevents damage to the working head, iron head, screw, and hammer rod caused by the forward thrust of the hammer rod or the backward thrust of the working head. In addition, the handle is designed to move back and forth relative to the housing. A first elastic element for shock absorption is supported between the handle and the housing. The first buffer rubber ring reduces the forward impact of the hammer rod and the backward impact of the working head, and the first elastic element reduces the transmission of vibration from the housing to the handle. This reduces the vibration felt by the hand holding the handle during use and improves the user experience. Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0018] Figure 1 A three-dimensional diagram of an electric pickaxe Figure One ; Figure 2 A three-dimensional diagram of an electric pickaxe Figure Two ; Figure 3 A schematic diagram of the cross-section of an electric pick before hammering; Figure 4 for Figure 3 Enlarged view of a portion at point A; Figure 5 for Figure 3 A magnified view of section B; Figure 6 This is a schematic diagram of the cross-section after being hammered by an electric pick; Figure 7 for Figure 6 A magnified view of a portion at point C; Figure 8 This is a cross-sectional view of the connection between the handle and the housing; Figure 9 for Figure 8 A magnified view of a portion at point D; Figure 10 This is a schematic diagram of the handle's structure; Figure 11 This is a cross-sectional view of the handle; Figure 12 for Figure 11 A magnified view of a portion at point E; Figure 13 An exploded view of the handle; Figure 14 This is a diagram showing the interaction between the operating element and the switching element; Figure 15 This is a schematic diagram of the operating element; Figure 16 This is an exploded view of the shell. Figure 17 This is a schematic diagram of the top cover structure; Figure 18 This is a schematic diagram of the rear cover structure; Figure 19 This is a schematic diagram of the base cover structure; Figure 20 Schematic diagram of the motor housing Figure One ; Figure 21 Schematic diagram of the motor housing Figure Two ; Figure 22 This is a schematic diagram of a cross-section of an electric pick. Figure 23 for Figure 22 A magnified view of a portion at point F; Figure 24 This is a structural diagram of the motor, gearbox, intermediate cover, front straight cylinder, air guide shroud, and cooling fan. Figure 25 This is a schematic diagram of the middle cover structure; Figure 26 This is a schematic diagram of the air guide shroud. Figure 27 A schematic diagram of the gearbox and front straight cylinder; Figure 28 for Figure 6 A magnified view of a portion of point G.

[0019] In the diagram: 1. Housing; 2. Handle; 3. Front straight cylinder; 4. Iron head; 5. Sliding sleeve; 6. Working head; 7. Top cover; 8. Rear cover; 9. Upper connecting part; 10. Switch push block; 11. Grip part; 12. Lower connecting part; 13. Bottom cover; 14. Motor housing; 15. Right side cover; 16. First air outlet; 17. Left side cover; 18. Corrugated sleeve; 19. Second air outlet; 20. Hammer; 21. Cylinder; 22. Connecting rod; 23. Motor cavity; 24. Drive motor; 25. Intermediate cover; 26. Drive gear; 27. Gearbox; 28. Eccentric gear; 29. ​​Shaft; 30. Eccentric pin; 31. Piston; 32. Inner ring; 33. Front stop sleeve; 34. Second abutment step; 35. Rear retaining ring; 36. First support spring; 37. Snap ring; 38. Assembly hole; 39. Ball pin; 40. Front retaining ring; 41. Front groove; 42. Inner annular protrusion; 43. Accommodation hole; 44. Rear groove; 45. Long groove; 46. Front step; 47. First buffer rubber ring; 48. Outer ring; 49. Rear step; 50. Rear anti-impact sleeve; 51. Impact protrusion; 52. Tail rod; 53. Second limiting protrusion; 54. First limiting protrusion; 55. Second buffer rubber ring; 56. First convex ring; 57. Hammer head; 58. First conical surface; 59. Conical hole; 60. Outer annular protrusion; 61. Buffer washer; 62. Second convex ring 63. First base; 64. First through hole; 65. Second base; 66. Second through hole; 67. Hammer rod; 68. Buffer seat; 69. Assembly slot; 70. Baffle; 71. Bolt; 72. First through hole; 73. Second support spring; 74. Spring washer; 75. Second through hole; 76. Nut; 77. Nut groove; 78. Outer rubber coating; 79. Push block hole; 80. Push block sleeve; 81. Right half shell; 82. Limiting groove; 83. Limiting block; 84. Left half shell; 85. Toggle switch; 86. Toggle groove; 87. Switch handle; 88. Outer ring; 89. Right clamping edge; 90. Positioning protrusion; 91. First connecting hole; 92. Second connecting part; 93. Right cover plate; 94. First connecting part; 95. Left clamping edge; 96. Left cover plate; 97. Second connecting hole; 98. Insert post; 99. Slot; 100. Positioning groove; 101. Fourth connecting hole; 102. Third connecting hole; 103. Front connecting hole; 104. Middle connecting hole; 105. Rear connecting hole; 106. Slot; 107. Lower support rib; 108. Air guide rib plate; 109. Airflow channel; 110. Second exhaust vent; 111. Cooling fan; 112. Air guide cover; 113. First exhaust vent; 114. Locking block; 115. Upper support rib; 116. First flat edge; 117. Second flat edge; 118. Oil filler port. Detailed Implementation

[0020] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of the invention.

[0021] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0022] Figures 1-28 As shown, the electric pick includes a housing 1, an impact mechanism, and a transmission mechanism. The housing 1 contains a gearbox 27 and a drive motor 24. A front straight cylinder 3 is fixed to the front of the gearbox 27. The front end of the front straight cylinder 3 extends out of the housing 1 and is fixed to an iron head 4 by screws. The iron head 4 has an assembly hole 38 for the working head 6 to be inserted. The transmission mechanism is at least partially located in the gearbox 27. The transmission mechanism transmits the power of the drive motor 24 to the impact mechanism. The impact mechanism includes a cylinder 21, a piston 31, a hammer 20, and a hammer rod 67. The piston 31 and the hammer 20 are reciprocally movable in the cylinder 21. The hammer 20 is located in front of the piston 31. The piston 31 is connected to the transmission mechanism. The hammer rod 67 is located in front of the hammer 20. The hammer rod 67 is used to withstand the impact of the hammer 20 and strike the working head 6 installed in the assembly hole 38. The rear of the housing 1 is equipped with a handle 2 for holding.

[0023] The bottom of the gearbox 27 has a downward-facing opening. An intermediate cover 25 is connected to the opening by screws. The intermediate cover 25 and the gearbox 27 enclose a gear cavity. The transmission mechanism includes a drive gear 26 driven by a drive motor 24, an eccentric gear 28 meshing with the drive gear 26, an eccentric pin 30 mounted on the eccentric gear 28, and a connecting rod 22 connected to the eccentric pin 30. The eccentric gear 28 and the drive gear 26 are located inside the gear cavity, and the connecting rod 22 is connected to the piston 31.

[0024] During operation, the drive motor 24 drives the drive gear 26 to rotate, and the eccentric gear 28 is driven to rotate by the drive gear 26. The eccentric pin 30 on the eccentric gear 28 rotates eccentrically around the rotation center of the eccentric gear 28. The rotating eccentric pin 30 drives the piston 31 to reciprocate in the cylinder 21 through the connecting rod 22. The piston 31 strikes the hammer rod 67 through the hammer 20 to drive the working head 6 installed in the assembly hole 38 to perform impact operation. This structure is a conventional structure in the field, and can be found in patent CN203449286U.

[0025] The eccentric pin 30 and the eccentric gear 28 are integrally formed. The integral eccentric gear 28 with the eccentric pin 30 has fewer structural parts, is easier to install, and is lighter. The side of the eccentric gear 28 away from the eccentric pin 30 has an integrally formed rotating shaft 29. The rotating shaft 29 is rotatably connected to the gearbox 27 through a bearing, so that the eccentric gear 28 can be rotatably installed in the gearbox 27. The rotor shaft of the drive motor 24 passes through the intermediate cover 25 and extends into the gear cavity, and the aforementioned drive gear 26 is fixed on the end that extends into the gear cavity.

[0026] Figure 24 , Figure 27 , Figure 28 As shown, the gearbox 27 and the front straight cylinder 3 are integrally formed. The middle cover 25, the front straight cylinder 3 and the gearbox 27 are all made of aluminum. The drive motor 24 is located below the middle cover 25. The rotor shaft of the drive motor 24 is connected to a cooling fan 111 located between the middle cover 25 and the drive motor 24. A guide shroud 112 is provided between the motor and the cooling fan 111. The cooling fan 111 is placed inside the guide shroud 112. The cooling fan 111 is a centrifugal fan. The guide shroud 112 has a first row of air vents 113 in the circumferential direction. The bottom of the middle cover 25 is provided with several guide ribs 108. The guide ribs 108 extend from the bottom of the middle cover 25 near the front straight cylinder 3 to the front of the cooling fan 111. A guide channel 109 is formed between adjacent guide ribs 108. The first row of air vents 113 is opposite to the rear opening of the guide channel 109. The housing 1 is provided with a first air outlet 16 located on the front side of the front opening of the guide channel 109.

[0027] When the electric hammer starts the drive motor 24, the rotor shaft of the drive motor 24 drives the cooling fan 111 to rotate. The air blown out by the cooling fan 111 is discharged from the first air outlet 113 and enters the guide channel 109 from the rear opening of the guide channel 109. It flows forward along the guide channel 109 and is guided by the guide channel 109 to blow towards the front straight cylinder 3. Finally, it is discharged from the first air outlet 16 on the housing 1. As the air passes through the guide channel 109, it carries away the heat on the middle cover 25 and carries away the heat on the front straight cylinder 3 when it blows towards the front straight cylinder 3. The heat is dissipated to the middle cover 25 and the front straight cylinder 3, so that the temperature between the middle cover 25 and the gearbox 27 and inside the front straight cylinder 3 will not be too high during operation, thus avoiding the impact of excessive temperature on the service life of the internal cylinder 21, piston 31 and transmission mechanism. In addition, the air guide plate 108 can increase the contact area with the flowing air to improve the heat dissipation efficiency. The air guide plate 108 can also act as a reinforcing rib, making the middle cover 25 stronger. The setting of the air guide cover 112 can make the blown air more concentrated and improve the heat dissipation effect.

[0028] The middle cover 25, the front straight cylinder 3, and the gearbox 27 are all made of aluminum. The middle cover 25 and the front straight cylinder 3 are integrally formed to facilitate the heat transfer inside. The air guide plate 108 is integrally formed with the middle cover 25.

[0029] The housing 1 has an upward-opening motor cavity 23, and the drive motor 24 is housed in the motor cavity 23. The bottom of the intermediate cover 25 is provided with an upper support rib 115, and the inner wall of the motor cavity 23 is provided with a lower support rib 107. The air guide shroud 112 is inserted into the motor cavity 23. The lower end of the air guide shroud 112 is supported on the lower support rib 107, and the upper end of the air guide shroud 112 is supported on the upper support rib 115. The air guide shroud 112 is sandwiched between the upper support rib 115 and the lower support rib 107 to be fixed between the drive motor 24 and the intermediate cover 25.

[0030] Figure 20 , Figure 26 As shown, a locking block 114 is provided on the outer peripheral surface of the air guide shroud 112, and a locking groove 106 is provided on the upper edge of the motor cavity 23. When the air guide shroud 112 is inserted into the motor cavity 23, the locking block 114 is inserted into the locking groove 106 to restrict the rotation of the air guide shroud 112.

[0031] Figure 22 , Figure 23 As shown, the air guide shroud 112 has second air vents 110 on its left and right sides around its circumference, and the housing 1 has second air outlets 19 on its left and right sides opposite to the second air vents 110. Part of the airflow generated by the rotation of the cooling fan 111 is blown out from the second air vents 110 on both sides and discharged from the housing 1 from the opposite second air outlets 19, so as to remove the heat from the drive motor 24 and the housing 1. The upper end of the side wall of the motor cavity 23 has a notch opposite to the first air vent 113 and the second air vent 110.

[0032] The housing 1 is provided with an air inlet. When the cooling fan 111 rotates, the external air enters the housing 1 through the air inlet and enters the air guide shroud 112 after passing through the drive motor 24. The air guide shroud 112 has a central hole in the middle that communicates with the interior. The central hole is used for the rotor shaft of the drive motor 24 and the airflow to pass through.

[0033] Figures 3-10As shown, the handle 2 can move back and forth relative to the housing 1. A first elastic element for shock absorption is supported between the handle 2 and the housing 1. A front step 46 and a rear step 49 are provided on the inner wall of the mounting hole 38. The step surfaces of the front step 46 and the rear step 49 are arranged opposite to each other. Between the front step 46 and the rear step 49, there is a front stop sleeve 33 for the working head 6 to abut against when it retracts, a rear stop sleeve 50 for the hammer rod 67 to abut against when it strikes forward, and a first buffer rubber ring 47 supported between the front stop sleeve 33 and the rear stop sleeve 50. The front end of the front stop sleeve 33 abuts against the front step 46, and the rear end of the rear stop sleeve 50 abuts against the rear step 49. The front stop sleeve 33 and the rear stop sleeve 50 can move relative to each other to squeeze the first buffer rubber ring 47 in the middle.

[0034] When the hammer rod 67 strikes the working head 6 installed in the assembly hole 38, the hammer rod 67 can rush forward to the rear stop sleeve 50 that is in front. The rear stop sleeve 50 is impacted by the hammer rod 67 and squeezes the first buffer rubber ring 47 forward. The first buffer rubber ring 47 is squeezed and deformed elastically, absorbing part of the kinetic energy before it is transferred to the iron head 4, thus buffering the forward impact of the hammer rod 67. After the working head 6 hits the object, it retracts. During the retraction process, the working head 6 strikes the front stop sleeve 33. The front stop sleeve 33 is impacted by the working head 6 and squeezes the first buffer rubber ring 47 backward. The first buffer rubber ring 47 is squeezed and deformed elastically. After absorbing some of the kinetic energy, it is then transferred to the iron head 4 to buffer the backward impact of the working head 6, preventing damage to the working head 6, iron head 4, screw, and hammer head 67 caused by the forward thrust of the hammer rod 67 or the backward thrust of the working head 6. In addition, the handle 2 is designed to move back and forth relative to the housing 1. A first elastic element for shock absorption is supported between the handle 2 and the housing 1. The first buffer rubber ring 47 reduces the forward impact of the hammer rod 67 and the backward impact of the working head 6. The first elastic element also reduces the vibration transmitted from the housing 1 to the handle 2, thereby reducing the vibration felt by the hand holding the handle 2 during use and improving the user experience.

[0035] An inner ring 32 protrudes from the rear end of the front anti-blow sleeve 33 near the rear anti-blow sleeve 50. A first buffer rubber ring 47 is fitted onto the inner ring 32. An outer ring 48 protrudes from the front end of the rear anti-blow sleeve 50 near the front anti-blow sleeve 33, opposite to the first buffer rubber ring 47. The front and rear sides of the first buffer rubber ring 47 abut against the rear end face of the front anti-blow sleeve 33 and the outer ring 48, respectively. There is a gap between the inner ring 32 and the rear anti-blow sleeve 50 for relative movement between the front anti-blow sleeve 33 and the rear anti-blow sleeve 50. The outer ring 48 is at least partially fitted onto the outside of the inner ring 32. This structure more stably limits the first buffer rubber ring 47 between the front anti-blow sleeve 33 and the rear anti-blow sleeve 50.

[0036] The rear stop sleeve 50 has an opening and is elastic, meaning that the rear stop sleeve 50 is a non-closed-loop annular structure. The rear stop sleeve 50 can be compressed by external force to break away from the obstruction of the rear step 49, thus enabling the rear stop sleeve 50 to be installed into or removed from the iron head 4.

[0037] The assembly hole 38 includes a first hole segment, a second hole segment, and a third hole segment arranged sequentially from front to back. The inner diameter of the second hole segment is smaller than the inner diameters of the first and third hole segments. A front step 46 is formed between the first and second hole segments, and a rear step 49 is formed between the second and third hole segments. The outer diameter of the front stop sleeve 33 is smaller than the inner diameter of the third hole segment, and the outer diameter of the front stop sleeve 33 is larger than the inner diameter of the first hole segment. The rear stop sleeve 50 can be compressed inward to reduce its outer diameter, thereby removing the rear stop sleeve 50 from the third hole segment to the rear. Then, the first buffer rubber ring 47 is deformed and removed. Since the outer diameter of the front stop sleeve 33 is smaller than the inner diameter of the third hole segment, the front stop sleeve 33 can be directly removed from the third hole segment to the rear.

[0038] The outer wall of the first buffer rubber ring 47 is in contact with the inner wall of the second hole section. The first buffer rubber ring 47 supports the front anti-blow sleeve 33, and the rear anti-blow sleeve 50 is opened so that its outer wall is in contact with the inner wall of the second hole section.

[0039] The side wall of the working head 6 is provided with a first abutting step for abutting against the front stop sleeve 33 when retracting to the back position. The part of the working head 6 located behind the first abutting step passes through the front stop sleeve 33 and the rear stop sleeve 50 to be impacted by the hammer rod 67.

[0040] The working head 6 has an axially oriented long slot 45. The outer wall of the iron head 4 has a receiving hole 43 that communicates with the assembly hole 38. A ball head pin 39 is installed in the receiving hole 43 for engaging with the long slot 45. The width of the opening at the inner end of the receiving hole 43 that communicates with the assembly hole 38 is less than the maximum width of the ball head pin 39 to prevent the ball head pin 39 from falling entirely into the assembly hole 38 from the receiving hole 43. The width of the opening at the outer end of the receiving hole 43 is greater than the maximum width of the ball head pin 39 for inserting or removing the ball head pin 39.

[0041] A retaining ring 37 is snapped onto the outer wall of the iron head 4. A second abutting step 34 is provided on the outer wall of the iron head 4 behind the retaining ring 37. A front retaining ring 40, a rear retaining ring 35, a first support spring 36, and a sliding sleeve 5 are fitted on the outside of the iron head 4. The front retaining ring 40 abuts against the retaining ring 37, and the rear retaining ring 35 abuts against the second abutting step 34. An inner annular protrusion 42 is provided on the inner side of the sliding sleeve 5 between the front retaining ring 40 and the rear retaining ring 35. The first support spring 36 is supported between the rear retaining ring 35 and the inner annular protrusion 42. The inner annular protrusion 42 divides the interior of the sliding sleeve 5 into a front groove 41 and a rear groove 44. The sliding sleeve 5 can slide back and forth along the iron head 4 so that the sliding sleeve 5 has a first position and a second position. The rear retaining ring 35 is always in the rear groove 44 during the sliding of the sliding sleeve 5.

[0042] When the sliding sleeve 5 slides to the first position, the inner annular protrusion 42 abuts against the front retaining ring 40, and the front retaining ring 40 is located within the front groove 41. The inner annular protrusion 42 surrounds the outside of the receiving hole 43 to prevent the ball head pin 39 from moving outward. The ball head pin 39 is engaged in the long groove 45, locking the working head 6 onto the iron head 4 and allowing it to move back and forth. When the sliding sleeve 5 slides to the second position, the inner annular protrusion 42 moves backward from the receiving hole 43 so that the outer end of the receiving hole 43 is aligned with the front groove 41. The ball head pin 39 can then partially move into the front groove 41 to disengage from the long groove 45. This structure of the sliding sleeve 5 facilitates quick assembly and disassembly of the working head 6. During the back-and-forth sliding process, the sliding sleeve 5 is always fitted outside the rear retaining ring 35, which prevents stones from entering the position between the rear retaining ring 35 and the inner annular protrusion 42.

[0043] The rear end face of the iron head 4 is provided with a first convex ring 56 that is inserted into the front straight cylinder 3. A buffer seat 68 and a buffer washer 61 located in front of the buffer seat 68 are provided between the hammer rod 67 and the hammer 20. The buffer seat 68 includes two seats with different diameters. The two adjacent seats are transitioned by a first annular step. The diameter of the first seat 63 located at the front is larger than the diameter of the second seat 65. The first seat 63 is fixed between the cylinder 21 and the first convex ring 56. The second seat 65 is inserted into the cylinder 21. Two through holes with different inner diameters are opened axially in the buffer seat 68. A second annular step is provided between adjacent through holes. The inner diameter of the first through hole 64 located at the front is larger than the inner diameter of the second through hole 66. A second buffer rubber ring 55 is provided in the first through hole 64. The rear part of the second buffer rubber ring 55 abuts against the second annular step. On the step, a buffer washer 61 is set inside the first convex ring 56. The front end of the buffer washer 61 abuts against the rear end face of the iron head 4. The rear end of the buffer washer 61 is inserted into the first through hole 64 and abuts against the front part of the second buffer rubber ring 55. The outer side of the buffer washer 61 is provided with an outer ring convex edge 60. The front side of the first seat 63 away from the second seat 65 is provided with a second convex ring 62. The second convex ring 62 is inserted into the first convex ring 56 and is opposite to the outer ring convex edge 60. There is a gap between the second convex ring 62 and the outer ring convex edge 60 for the buffer washer 61 to move relative to the buffer seat 68. The rear end of the hammer rod 67 passes through the buffer washer 61, the second buffer rubber ring 55 and the buffer seat 68 to serve as the part to bear the impact of the hammer 20. The buffer washer 61 is provided with abutting part for the hammer rod 67 to abut when it retracts.

[0044] After the hammer rod 67 strikes the working head 6, it retracts to its original position. The retracted hammer rod 67 can strike the abutment part of the buffer washer 61. After being impacted, the buffer washer 61 presses the second buffer rubber ring 55 backward. The second buffer rubber ring 55 absorbs part of the kinetic energy and then transmits it to the iron head 4 and the front straight cylinder 3 to reduce the impact of the hammer rod 67 returning to its original position, protect the components, and reduce the vibration transmitted to the housing 1.

[0045] The hammer rod 67 includes a hammer head 57 for impacting the working head 6 and a tail rod 52 fixed to the rear of the hammer head 57. The tail rod 52 passes through the buffer washer 61, the second buffer rubber ring 55 and the buffer seat 68 as the part to bear the impact of the hammer 20. The outer diameter of the hammer head 57 is larger than the inner diameter of the inner hole of the buffer washer 61. The rear end face of the hammer head 57 is set as a first conical surface 58. The front side of the buffer washer 61 is provided with a conical hole 59 for abutting and cooperating with the first conical surface 58. The front end of the inner hole of the buffer washer 61 is connected to the conical hole 59. The conical hole 59 serves as the abutting part when the hammer rod 67 retracts. When the hammer rod 67 returns to its original position, the rear end of the hammer head 57 enters the conical hole 59 so that the first conical surface 58 abuts against the inner wall of the conical hole 59, making the force more even.

[0046] The front end face of the hammer 20 is provided with an impact protrusion 51 for impacting the tail rod 52. When the hammer 20 pushes the hammer rod 67 to move until the hammer head 57 abuts against the rear stop sleeve 50, there is a gap between the front end face of the hammer 20 and the rear end face of the second seat 65. When the hammer rod 67 hits the rear stop sleeve 50, the hammer 20 has not yet contacted the buffer seat 68, thereby preventing the hammer 20 from hitting the buffer seat 68 during the forward impact. The impact protrusion 51 can be inserted into the through hole on the buffer seat 68.

[0047] The inner side of the second buffer rubber ring 55 is provided with a first limiting protrusion 54, and the outer side of the tail rod 52 is provided with a second limiting protrusion 53. The outer diameter of the second limiting protrusion 53 is larger than the inner diameter of the first limiting protrusion 54. During the back-and-forth movement of the hammer rod 67, the second limiting protrusion 53 will pass through the first limiting protrusion 54. When passing through, the second limiting protrusion 53 squeezes the first limiting protrusion 54 to elastically deform. At the same time, the first limiting protrusion 54 provides a resistance to the forward or backward movement of the second limiting protrusion 53. The first limiting protrusion 54 acts as a speed bump to consume the energy of the hammer rod 67's forward and backward movement and prevent the hammer rod 67 from continuously striking empty air.

[0048] Figures 10-15 As shown, the handle 2 contains a switch element. The handle 2 includes a grip part 11 for hand gripping and an upper connecting part 9 connected to the upper end of the grip part 11. The upper connecting part 9 is used to connect to the rear of the housing 1. The upper connecting part 9 is provided with an operating element for controlling the switch element to be turned on or off. The grip part 11 is covered with an outer adhesive 78.

[0049] This patent moves the operating element to the upper connecting part 9, so that when the user holds the grip part 11, the switch element will not be accidentally activated due to accidental touch of the operating element. The upward movement of the operating element allows the grip part 11 to be fully covered with rubber. The grip part 11 is covered with soft rubber to make the user feel better.

[0050] The handle 2 also includes a lower connecting part 12 connected to the lower end of the grip part 11. The upper connecting part 9 is used to connect to the upper end of the rear part of the housing 1, and the lower connecting part 12 is used to connect to the lower end of the rear part of the housing 1. The grip part 11, the upper connecting part 9, the lower connecting part 12 and the housing 1 are arranged together to form a grip hole for inserting fingers.

[0051] The operating element is a switch push block 10, which is horizontally positioned on the upper connecting part 9 and can move laterally relative to the upper connecting part 9. Pushing the switch push block 10 to the right or left controls the switching element to be turned on or off. After one end of the switch push block 10 is pushed into the upper connecting part 9, the other end protrudes from the other side of the upper connecting part 9. When the switching element is turned on, the drive motor 24 inside the housing 1 is energized and operates; when the switching element is turned off, the drive motor 24 inside the housing 1 is de-energized and stops.

[0052] The switching element is a toggle switch 85. A toggle groove 86 is provided on the switch push block 10. The switch handle 87 of the toggle switch 85 is inserted into the toggle groove 86. When the switch push block 10 is pushed to the right or left by an external force, the inner wall of the toggle groove 86 causes the switch handle to swing to the right or left, thereby controlling the toggle switch 85 to be on or off. The toggle switch 85 is a conventional switch structure, such as a toggle switch from the brand "Kuosen". A recess is provided in the handle 2, and the toggle switch 85 is inserted and fixed within the recess.

[0053] The inner walls of the toggle slot 86, which are opposite to each other on the left and right sides and are used to push the switch handle 87 to swing, are inclined so that the toggle switch 85 can be toggled to the on or off state.

[0054] The upper connecting part 9 is provided with a limiting groove 82, and the switch push block 10 is provided with a limiting block 83 that moves within the limiting groove 82. The limiting groove 82 cooperates with the limiting block 83 to limit the extreme position of the switch push block 10 to the left or right. The handle 2 is composed of a left half shell 84 and a right half shell 81. The left half shell 84 and the right half shell 81 are joined together and fixedly connected by screws. Both the left half shell 84 and the right half shell 81 are provided with push block sleeves 80. The push block sleeves 80 on the left half shell 84 and the push block sleeves 80 on the right half shell 81 are arranged opposite to each other. The push block sleeves 80 are provided with push block holes 79 for the switch push block 10 to slide. The two opposite push block sleeves 80 form a limiting groove 82.

[0055] Figures 16-21As shown, the housing 1 includes a left side cover 17, a right side cover 15, a top cover 7, a rear cover 8, and a motor housing 14. The drive motor 24 is installed inside the motor housing 14. The left side cover 17 includes a left cover plate 96 and a left clamping edge 95 fixed to the front of the left cover plate 96. The right side cover 15 includes a right cover plate 93 and a right clamping edge 89 fixed to the front of the right cover plate 93. The top and bottom of the left clamping edge 95 are provided with a first connecting part 94, and the first connecting part 94 has a first threaded hole for connecting with a screw. The top and bottom of the right clamping edge 89 are provided with a second connecting part 92 corresponding to the first connecting part 94, and the second connecting part 92 has a first connecting hole 91 for the screw to pass through. The left side cover 17 and the right side cover 15 are connected to each other by a screw that passes through the first connecting hole 91 and is threaded into the first threaded hole. The left clamping edge 95 and the right clamping edge 89 are combined to form a sleeve on the front straight cylinder 3. The outer outer ring 88, the left cover plate 96 and the right cover plate 93 surround the left and right sides of the gearbox 27, and there is a cavity between them for accommodating the gearbox 27. The top opening of the cavity is formed between the top of the left cover plate 96 and the right cover plate 93, the bottom opening of the cavity is formed between the bottom of the left cover plate 96 and the right cover plate 93, and the rear opening of the cavity is formed between the rear of the left cover plate 96 and the right cover plate 93. The top cover 7 is installed above the left cover 17 and the right cover 15 and covers the top opening and the first connecting part 94 and the second connecting part 92 located at the top of the outer ring 88. The motor housing 14 is installed below the left cover 17 and the right cover 15 and covers the bottom opening and the first connecting part 94 and the second connecting part 92 located at the bottom of the outer ring 88. The rear cover 8 is installed behind the left cover 17 and the right cover 15 and covers the rear opening.

[0056] Since the first connecting part 94 and the second connecting part 92 are located at the top and bottom of the outer ring 88, they will be covered when the top cover 7 and the motor housing 14 are installed. The hidden screw design of the left cover 17 and the right cover 15 ensures that there are no exposed screws on the left and right sides of the housing 1, which improves the appearance and reduces the number of exposed screws on the housing 1.

[0057] The first connecting part 94 and the second connecting part 92 are inserted into each other to align the first connecting hole 91 with the first threaded hole, so that the left cover 17 and the right cover 15 can be connected by screws after being assembled.

[0058] The bottom of the left cover 17 and the bottom of the right cover 15 are provided with a first flat edge 116 around the bottom opening. The top edge of the motor housing 14 is provided with a second flat edge 117 corresponding to the first flat edge 116. When the motor housing 14 is installed under the left cover 17 and the right cover 15, the first flat edge 116 and the second flat edge 117 are in contact with each other to adjust the position of the left cover 17 and the right cover 15.

[0059] The top of the left cover 17 and the top of the right cover 15 are provided with positioning protrusions 90 around the top opening. The top cover 7 is provided with positioning grooves 100 that cooperate with the positioning protrusions 90. When the top cover 7 is installed above the left cover 17 and the right cover 15, the positioning protrusions 90 are inserted into the positioning grooves 100 to limit and lock the positions of the left cover 17 and the right cover 15.

[0060] The top cover 7 has an upward-facing second connecting hole 97, through which a screw for connection to the gearbox 27 passes. The gearbox 27 has a second threaded hole for connection to the screw. The motor housing 14 has downward-facing front connecting holes 103, middle connecting holes 104, and rear connecting holes 105 at its front, middle, and rear parts, respectively. Screws for connection to the intermediate cover 25 or the gearbox 27 pass through these holes. The housing 1 includes a bottom cover 13, which is mounted on the bottom of the motor housing 14 and... The rear cover 8 is installed behind the motor housing 14, the left side cover 17 and the rear side cover, covering the rear connection hole 105, so that the middle connection hole 104 and the rear connection hole 105 on the motor housing 14 are covered, reducing the exposed screws on the housing 1. The bottom surface of the bottom cover 13 is provided with a third connection hole 102 with the opening facing downward. A screw connected to the motor housing 14 passes through the third connection hole 102. The rear cover 8 is provided with a fourth connection hole 101 with the opening facing backward. A screw connected to the motor housing 14 or the gearbox 27 passes through the fourth connection hole 101.

[0061] Insertion posts 98 and slots 99 are provided between the bottom cover 13 and the motor housing 14, between the motor housing 14 and the intermediate cover 25, between the top cover 7 and the gearbox 27, and between the rear cover 8 and the motor housing 14 and the gearbox 27 for easy assembly. During assembly, the left cover 17 and the right cover 15 are first connected to each other with screws so that the left cover 17 and the right cover 15 are installed on the left and right sides of the gearbox 27. Then, the top cover 7, the motor housing 14, the bottom cover 13, and the rear cover 8 are installed in sequence.

[0062] Both ends of the handle 2 are connected to the rear cover 8 via a connecting mechanism, which includes a baffle 70, a bolt 71, and a nut 76. The baffle 70 is fixedly mounted on the handle 2, and the handle 2 has an assembly groove 69 for the baffle 70 to be inserted. The baffle 70 has a first through hole 72. The interior of the rear cover 8 has a nut groove 77, and the nut 76 is inserted into the nut groove 77. The rear side of the rear cover 8 has a second through hole 75 that communicates with the nut groove 77. The head of the bolt 71 is placed inside the handle 2, and the bolt 71 passes through the first through hole. 72 and the second through hole 75 are connected to the nut 76. The first elastic element is the second support spring 73, which is sleeved on the bolt 71. One end of the second support spring 73 is supported on the baffle 70, and the other end is supported on the spring washer 74 on the rear side of the rear cover 8. The spring washer 74 is sleeved on the bolt 71. A retractable corrugated sleeve 18 is connected between the handle 2 and the rear cover 8. The corrugated sleeve 18 is sleeved on the outside of the bolt 71 and the second support spring 73. The handle 2 can move back and forth along the bolt 71 relative to the rear cover 8. The corrugated sleeve 18 is a rubber sleeve.

[0063] The vibration is reduced by the first buffer rubber ring 47, the second buffer rubber ring 55, the first elastic element and the outer rubber 78, so that there is almost no vibration when holding it. The gearbox 27 and the front straight cylinder 3 are integrally formed, which is lightweight, avoids oil leakage, saves machine space, makes the machine lightweight and easy to operate. The gearbox 27 is provided with a filling port 118, and the housing 1 is equipped with a cover to cover the filling port 118.

[0064] The electric pick provided by this invention has been described above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand this invention and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. An electric pick comprising a housing, an impact mechanism and a transmission mechanism, a gear box is arranged in the housing, a driving motor is arranged in the housing as a power source, a front straight cylinder is arranged in the front part of the gear box, the front end of the front straight cylinder extends out of the housing and is fixedly connected with a head by screws, an assembly hole is arranged in the head for accommodating a working head, the transmission mechanism is at least partially arranged in the gear box, the transmission mechanism transmits power from the driving motor to the impact mechanism, the impact mechanism comprises a cylinder, a piston, a ram and a hammer rod, the piston and the ram are arranged in the cylinder and can reciprocate, the ram is arranged at the front side of the piston, the piston is connected with the transmission mechanism, the hammer rod is arranged at the front side of the ram, the hammer rod is used for bearing the impact of the ram and impacting the working head arranged in the assembly hole forwardly to make the working head impact work, a handle is arranged at the rear part of the housing for holding, characterized in that, The handle can move forward and backward relative to the shell, and a first elastic member for shock absorption is arranged between the handle and the shell, inner walls of the assembly hole are provided with a front step and a rear step, step surfaces of the front step and the rear step are arranged oppositely, a front impact stop sleeve for abutting of the working head in backward return, a rear impact stop sleeve for abutting of the hammer in forward impact, and a first buffer rubber ring supported between the front impact stop sleeve and the rear impact stop sleeve are arranged between the front step and the rear step, a front end of the front impact stop sleeve abuts against the front step, a rear end of the rear impact stop sleeve abuts against the rear step, and the front impact stop sleeve and the rear impact stop sleeve can move relative to each other to extrude the first buffer rubber ring.

2. The electrical pick of claim 1, wherein, The front impact stop sleeve is provided with an inner sleeve ring protruding close to the rear end of the rear impact stop sleeve, the first buffer rubber ring is sleeved on the inner sleeve ring, the rear impact stop sleeve is provided with an outer ring protruding close to the front end of the front impact stop sleeve and opposite to the first buffer rubber ring, front and rear sides of the first buffer rubber ring abut against the rear end surface of the front impact stop sleeve and the outer ring respectively, the inner sleeve ring has a gap relative to the rear impact stop sleeve for relative movement of the front impact stop sleeve and the rear impact stop sleeve, the outer ring is at least partially sleeved on the outside of the inner sleeve ring, a first abutting step for abutting of the working head against the front impact stop sleeve in backward return is arranged on a side wall of the working head, and a part of the working head located at a rear side of the first abutting step passes through the front impact stop sleeve and the rear impact stop sleeve for being impacted by the hammer.

3. The electrical shovel according to claim 1, characterized by A long slot is arranged on the working head in an axial direction, a containing hole is arranged on an outer wall of the iron head and communicates with the assembly hole, a ball head pin for clamping connection with the long slot is arranged in the containing hole, a clamping spring is clamped on the outer wall of the iron head, a second abutting step is arranged on the outer wall of the iron head at a rear side of the clamping spring, a front stop ring and a rear stop ring, a first supporting spring and a sliding sleeve are sleeved on the outside of the iron head, the front stop ring abuts against the clamping spring, the rear stop ring abuts against the second abutting step, an inner annular protruding edge is protruded on an inner side of the sliding sleeve and located between the front stop ring and the rear stop ring, the first supporting spring is supported between the rear stop ring and the inner annular protruding edge, the inner annular protruding edge divides an inner part of the sliding sleeve into a front groove and a rear groove, the sliding sleeve can slide forward and backward along the iron head, so that the sliding sleeve has a first position and a second position, the rear stop ring is always located in the rear groove during sliding of the sliding sleeve, when the sliding sleeve slides to the first position, the inner annular protruding edge abuts against the front stop ring and the front stop ring is located in the front groove, the inner annular protruding edge surrounds the outside of the containing hole to block the ball head pin from moving outward, the ball head pin is clamped in the long slot to lock the working head on the iron head for forward and backward movement, when the sliding sleeve slides to the second position, the inner annular protruding edge moves away from the containing hole rearward to make an outer end of the containing hole opposite to the front groove.

4. The electrical shovel according to claim 1, characterized by The rear end surface of the iron head is provided with a first convex ring inserted into the front straight cylinder, a buffer seat is arranged between the hammer rod and the hammer, and a buffer washer is arranged in front of the buffer seat. The buffer seat includes two seat bodies with different diameters. The two seat bodies are connected through a first annular step. The diameter of the first seat body in the front part is larger than that of the second seat body. The first seat body is fixed between the cylinder and the first convex ring. The second seat body is inserted into the cylinder. Two through holes with different diameters are arranged in the buffer seat in the axial direction. The first through hole in the front part has a larger diameter than the second through hole. A second buffer rubber ring is arranged in the first through hole. The rear part of the second buffer rubber ring is abutted against the second annular step. The buffer washer is arranged in the first convex ring. The front end of the buffer washer is abutted against the rear end surface of the iron head. The rear end of the buffer washer is inserted into the first through hole and abutted against the front part of the second buffer rubber ring. The buffer washer is provided with an outer ring convex edge. The front side of the first seat body away from the second seat body is provided with a second convex ring. The second convex ring is inserted into the first convex ring and opposite to the outer ring convex edge. A gap is arranged between the second convex ring and the outer ring convex edge for the buffer washer to move relative to the buffer seat. The rear end of the hammer rod passes through the buffer washer, the second buffer rubber ring and the buffer seat to serve as a part for bearing the impact of the hammer. The buffer washer is provided with an abutting part for abutting when the hammer rod retreats.

5. The electrical shovel according to claim 4, characterized by The hammer rod includes a hammer head for impacting the working head and a tail rod fixed to the rear part of the hammer head. The tail rod passes through the buffer washer, the second buffer rubber ring and the buffer seat to serve as a part for bearing the impact of the hammer. The outer diameter of the hammer head is larger than the inner diameter of the inner hole of the buffer washer. The rear end surface of the hammer head is provided as a first taper surface. The front side of the buffer washer is provided with a tapered hole for abutting with the first taper surface. The front end of the inner hole of the buffer washer is connected with the tapered hole. The front end surface of the hammer is provided with an impact convex for impacting the tail rod. When the hammer pushes the hammer rod to move to the hammer head abutting against the rear stop sleeve, the front end surface of the hammer has a spacing with the rear end surface of the second seat body.

6. The electrical shovel according to claim 5, characterized by The inner side of the second buffer rubber ring is provided with a first limiting convex. The outer side of the tail rod is provided with a second limiting convex. The outer diameter of the second limiting convex is larger than the inner diameter of the first limiting convex.

7. The electrical shovel according to claim 1, characterized by The gear box and the front straight cylinder are integrally formed, the gear box bottom has a box mouth, the box mouth is connected with an intermediate cover, the intermediate cover, the front straight cylinder and the gear box are aluminum parts, the intermediate cover and the gear box are surrounded to form a gear cavity, the transmission mechanism comprises a driving gear rotating driven by a driving motor, an eccentric gear in meshing transmission with the driving gear, an eccentric pin arranged on the eccentric gear, a connecting rod connected with the eccentric pin, the eccentric gear and the driving gear are arranged in the gear cavity, the connecting rod is connected with the piston, the eccentric pin is integrally formed with the eccentric gear, the driving motor is arranged below the intermediate cover, a heat dissipation fan between the intermediate cover and the driving motor is connected with a rotor shaft of the driving motor, a wind guide cover is arranged between the motor and the heat dissipation fan, the heat dissipation fan is arranged in the wind guide cover, the heat dissipation fan is a centrifugal fan, a first air outlet is formed in the circumferential direction of the wind guide cover, a plurality of wind guide ribs are arranged on the bottom of the intermediate cover, the wind guide ribs extend from the side of the intermediate cover bottom adjacent to the front straight cylinder to the front of the heat dissipation fan, the adjacent wind guide ribs form a flow guide channel, the first air outlet is opposite to the rear end opening of the flow guide channel, and the first air outlet is arranged on the front side of the flow guide channel front end opening.

8. The electrical shovel according to claim 1, characterized by The handle is internally provided with a switch element, the handle comprises a holding part for holding hands and an upper connecting part connected to the upper end of the holding part, the upper connecting part is used for connecting with the rear part of the shell, an operating element for controlling the switch element to be turned on or turned off is arranged on the upper connecting part, and the outer part of the holding part is covered with an outer rubber.

9. The electrical shovel according to claim 1, characterized by The shell comprises a left cover, a right cover, a top cover, a rear cover and a motor shell, the driving motor is arranged in the motor shell, the left cover comprises a left cover plate and a left clamping edge fixed to the front part of the left cover plate, the right cover comprises a right cover plate and a right clamping edge fixed to the front part of the right cover plate, the top part and the bottom part of the left clamping edge are provided with first connecting parts, the first connecting parts are provided with first threaded holes for connecting with screws, the top part and the bottom part of the right clamping edge are provided with second connecting parts corresponding to the first connecting parts, the second connecting parts are provided with first connecting holes for the screws to pass through, the left cover and the right cover are connected with each other through the screws passing through the first connecting holes and being threadedly connected with the first threaded holes, the left clamping edge and the right clamping edge are spliced to form an outer sleeve ring sleeved outside the front straight cylinder, the left cover plate and the right cover plate surround the left and right sides of the gear box and have a cavity for accommodating the gear box between them, the top part of the left cover plate and the top part of the right cover plate form a top opening of the cavity, the bottom part of the left cover plate and the bottom part of the right cover plate form a bottom opening of the cavity, and the rear part of the left cover plate and the rear part of the right cover plate form a rear opening of the cavity, the top cover is arranged above the left cover and the right cover and covers the top opening and the first connecting part and the second connecting part on the top part of the outer sleeve ring, the motor shell is arranged below the left cover and the right cover and covers the bottom opening and the first connecting part and the second connecting part on the bottom part of the outer sleeve ring, and the rear cover is arranged behind the left cover and the right cover and covers the rear opening.

10. The electrical pick of claim 9, wherein, The upper and lower ends of the handle are connected with the rear cover through a connecting mechanism, the connecting mechanism comprises a baffle, a bolt and a nut, the baffle is fixed on the handle, the baffle is provided with a first through hole, the inside of the rear cover is provided with a nut groove, the nut is inserted into the nut groove, the rear side of the rear cover is provided with a second through hole which is communicated with the nut groove, the head of the bolt is arranged in the handle, the bolt passes through the first through hole and the second through hole and is connected with the nut, the first elastic member is a second supporting spring, the second supporting spring is sleeved on the bolt, one end of the second supporting spring is supported on the baffle, the other end of the second supporting spring is supported on the spring washer on the rear side of the rear cover, a telescopic corrugated sleeve is connected between the handle and the rear cover, the corrugated sleeve is sleeved on the outside of the bolt and the second supporting spring, and the handle can move forward and backward relative to the rear cover along the bolt.

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