CN211681905U

CN211681905U - Electric hammer

Info

Publication number: CN211681905U
Application number: CN201921385506.3U
Authority: CN
Inventors: 朱荣根; 付祥青
Original assignee: Nanjing Deshuo Industrial Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2018-12-28
Filing date: 2019-08-23
Publication date: 2020-10-16
Anticipated expiration: 2029-08-23
Also published as: CN111376213A; CN111376214A; CN210616409U; CN111390843B; CN111390843A; CN111376214B

Abstract

The utility model discloses an electric hammer, include: the striking shaft comprises a striking end for striking the nail, and can reciprocate along a first axis; the impact mechanism is used for outputting impact force to the striking shaft to drive the striking shaft to strike the nail; a motor for driving the impact mechanism; a housing for supporting the striking shaft, the impact mechanism and the motor; the impact mechanism includes: the impact block is used for impacting the striking shaft in a reciprocating manner; the supporting shaft is used for supporting the impact block; the impact block transmits impact force to the striking shaft by making surface contact with the striking shaft. The power of the electric hammer for striking the nails is enhanced, and the service life is prolonged.

Description

Electric hammer

Technical Field

The utility model relates to an electric tool, concretely relates to electric hammer.

Background

For a fixed nail electric tool for driving a nail into a substrate, such as an electric hammer, the reciprocating impact action of the electric hammer is usually realized by converting the rotation action of a motor into the reciprocating impact action through a conversion device. However, the conventional conversion device is easily worn, so that once the conversion device is worn, the electric hammer works in a low efficiency or is damaged, the striking force is insufficient, and the use requirements of users are difficult to meet, so that the service life of the conventional electric hammer is short, and the improvement is needed.

SUMMERY OF THE UTILITY MODEL

In order to solve the defects of the prior art, the main object of the utility model is to provide an electric hammer, which enhances the impact strength and has a long service life.

In order to realize the above main utility model purpose, provide an electric hammer, include: the striking shaft comprises a striking end which can reciprocate along a first axis and strike the nail during movement, and the striking end is provided with a striking surface which is contacted with the nail; the impact mechanism is used for impacting the impact shaft to reciprocate; a motor for driving the impact mechanism; a housing for supporting the striking shaft, the impact mechanism and the motor; wherein, impact mechanism includes: an impact block formed with an impact surface for contacting the striking shaft to output an impact force to the striking shaft; the supporting shaft is used for supporting the impact block; wherein, the striking shaft is provided with a force bearing surface which is used for contacting with the impact surface to receive the impact force output by the impact block; when the impact surface and the force bearing surface are contacted for impact, the ratio of the area of the surface, attached to the impact surface, of the force bearing surface to the area of the striking surface is more than or equal to 0.5 and less than or equal to 20.

Optionally, the force-bearing surface is a plane.

Alternatively, the striking shaft and the impact mechanism may be rotatably coupled, and the impact mechanism may apply only an impact force to the striking shaft without applying a rotational force.

Optionally, the electric hammer further comprises a buffer assembly arranged between the impact mechanism and the housing, the buffer assembly at least comprises a buffer gasket and a rubber ring, and the buffer gasket is arranged between the rubber ring and the impact mechanism.

Optionally, the impact block has an accommodating groove, the supporting shaft is provided with a guiding groove arranged opposite to the accommodating groove, the electric hammer comprises a moving part arranged in the accommodating groove and the guiding groove, and the moving part slides in the guiding groove to drive the impact block to perform reciprocating impact motion.

In order to realize the above main utility model purpose, provide an electric hammer, include: the striking shaft comprises a striking end for striking the nail, and can reciprocate along a first axis; the impact mechanism is used for outputting impact force to the striking shaft to drive the striking shaft to strike the nail; a motor for driving the impact mechanism; a housing for supporting the striking shaft, the impact mechanism and the motor; wherein, impact mechanism includes: the impact block is used for impacting the striking shaft in a reciprocating manner; the supporting shaft is used for supporting the impact block; wherein, the impact block transmits impact force to the striking shaft by making surface contact with the striking shaft.

Optionally, at least a part of the striking shaft is made of ferromagnetic material.

Optionally, the impact mechanism includes a nail holding mechanism disposed at the end of the housing, and the nail holding mechanism includes a magnetic member for attracting the fastener.

Optionally, the impact block and the support shaft are provided with a guide groove and a receiving groove which are arranged oppositely, the electric hammer comprises a moving part arranged in the receiving groove and the guide groove, and the moving part slides in the guide groove to drive the impact block to perform reciprocating impact motion.

The electric hammer impacts the impact shaft through an impact surface formed by the impact block, and the impact shaft is provided with a stress surface which is used for contacting with the impact surface to receive the impact force output by the impact block; the ratio of the area of the surface, which is attached to the impact surface, of the stress surface to the area of the impact surface is reasonable, the impact force is transmitted through the matching of the impact shaft and the impact block, so that the impact strength of the electric hammer is enhanced, and the service life of the electric tool can be effectively prolonged.

Drawings

Fig. 1 is a schematic view of an electric hammer according to one embodiment;

fig. 2 is a schematic view of an application scenario of the electric hammer of fig. 1;

fig. 3 is a cross-sectional view of the electric hammer of fig. 1;

fig. 4 is an internal structural view of the electric hammer of fig. 1;

fig. 5 is a schematic structural view of the impact block and the energy storage mechanism of the electric hammer of fig. 1;

fig. 6 is an exploded view of the impact mechanism of the electric hammer of fig. 1;

fig. 7 is an exploded view of the internal components of the first receiving portion of the electric hammer of fig. 1;

fig. 8 is a diagram of the retention force provided by the retention mechanism to be overcome of the power hammer of fig. 1 versus the displacement of the striking shaft;

fig. 9 is a schematic view of a control flow of the electric hammer according to an embodiment of the present invention;

fig. 10 is a schematic diagram illustrating a control flow of the electric hammer according to an embodiment of the present invention.

Detailed Description

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in a generic and descriptive sense only and not for purposes of limitation, as the terms are used in the description to indicate that the referenced device or element must have the specified orientation, be constructed and operated in the specified orientation, and not for the purpose of limitation.

Referring to fig. 1 to 3, an electric hammer 300 is provided, the electric hammer 300 includes a striking shaft 11, the striking shaft 11 includes a striking end 1111 capable of reciprocating along a first axis 200 and striking a fastener 100 during movement, and the striking end 1111 is formed with a striking surface 1123 contacting the fastener 100. In the present embodiment, the fastener 100 is a nail.

The electric hammer further comprises an impact mechanism 10 and a driving mechanism 20, wherein the driving mechanism 20 is used for driving the impact mechanism 10, the driving mechanism 20 comprises a motor 21, and the motor 21 comprises a motor shaft 24; the impact mechanism 10 is used for impacting the impact shaft 11 to reciprocate; the impact mechanism 10 includes an impact block 12 formed with an impact surface 1122 for contacting the striking shaft 11 to output an impact force to the striking shaft 11, and a support shaft 70 for supporting the impact block 12.

The electric hammer further comprises a transmission mechanism 30 connected with the motor shaft 24 and the impact mechanism 10, and the transmission mechanism 30 transmits the rotating force output by the motor 21 to the support shaft 70 of the impact mechanism 10. The support shaft 70 is coupled to the striking shaft 11 and provides energy to drive the striking shaft 11 in a reciprocating impact motion to provide an impact pulse to drive the fastener 100 into a substrate.

The support shaft 70 connects the transmission mechanism 30 and the striking shaft 11, and converts the rotational motion of the driving mechanism 20 into the reciprocating impact motion of the impact block 12 along the first axis 200 by the support shaft 70. As shown in fig. 2, the electric hammer 300 is used to drive the fastener 100 into a substrate, and the striking shaft 11 directly acts on the fastener 100 to cause the fastener 100 to be driven into the substrate by striking the fastener 100 in the direction of the first axis 200. The electric hammer 300 includes a front end device 14, the front end device 14 has a striking opening, the front end device 14 impacts the fastener 100 by inserting the fastener 100 into the striking opening, and the impact assembly provides multiple pulses to strike the fastener 100 into the substrate.

The electric hammer 300 also includes a power source and housing 50 that is coupled to the drive mechanism 20 and that provides energy to the drive mechanism 20 to operate the drive mechanism 20. The housing 50 encloses the internal components of the electric hammer 300 and is available for a user to hold. The housing 50 includes a second accommodating portion 51 and a first accommodating portion 52.

Referring to fig. 1 and 4, the first receiving portion 52 is formed around a first receiving cavity 521 extending substantially in a first linear direction. The striking shaft 11 is supported at least partially in a first linear direction in the first accommodation chamber 521, and the impact mechanism 10 is disposed in the first accommodation chamber 521. The second receiving portion 51 surrounds a second receiving chamber 511 formed to extend substantially in a second linear direction, the motor 21 is disposed in the second receiving chamber 511, and the second receiving portion 51 is disposed at a lower side of the first receiving portion 52. The second receiving portion 51 further includes a grip portion 511 for a user to grip. The first line and the second line are perpendicular to each other, the first line being parallel to the first axis 200 and the second line being perpendicular or approximately perpendicular to the first axis 200. The impact block 12 transmits impact force to the striking shaft 11 by making surface contact with the striking shaft 11. Thus, on the one hand, since the contact form between the striking shaft 11 and the impact block 12 is surface contact, the impact block 12 can reliably transmit the impact force to the striking shaft 11, thereby improving the impact strength; on the other hand, the contact surface between the impact block 12 and the striking shaft 11 is relatively large, so that under the condition of the same impact force, the pressure intensity of the impact block 12 and the striking shaft 11 is relatively small compared with the condition that the contact surface is relatively small, and the situation that the impact block 12 and the striking shaft 11 are broken possibly due to insufficient strength of 1 is avoided; moreover, the contact surface between the impact block 12 and the striking shaft 11 is relatively large, so that the abrasion speed of the impact block 12 and the striking shaft 11 is reduced, and the service life of the electric hammer 300 is prolonged.

In the present embodiment, the electric hammer 300 has a substantially "T" configuration, and the housing 50 includes a first receiving portion and a second receiving portion. It should be noted that in some other embodiments, the relative relationship between the second receiving portion and the first receiving portion may be designed to be other types, for example, it may be an "L" shaped structure, and the form of the electric hammer 300 may not only be formed by the second receiving portion and the first receiving portion, but also be provided with other elements, such as a connecting arm, a supporting arm, etc., and form an "L" shape, a rectangular shape, etc., of the electric hammer 300 through various connecting manners, which will not be described in detail herein.

Optionally, in order to optimize the overall structure of the electric hammer 300, the transmission shaft 34 and the striking shaft 11 are arranged in parallel, so that the projection of the second accommodating part 51 along the second linear direction is not larger than the projection of the first accommodating part along the second linear direction, preferably, the second accommodating part 51 is relatively connected to the middle of the first accommodating part, the electric hammer 300 forms a T-shaped structure, and the rear edge of the holding part 511 is designed to be recessed forward to match the posture of the holding part 511 held by the user. The projection of the second accommodating part 51 in the second linear direction does not exceed the projection of the first accommodating part in the second linear direction, so that when the user grips the gripping part 511, the projection of the hand in the second linear direction does not exceed the projection of the first accommodating part in the second linear direction, the electric hammer 300 can be operated to work in a relatively narrow space, and the applicability of the electric hammer 300 is improved.

Correspondingly, the striking shaft 11 is distributed on both sides of the straight line on which the motor shaft 24 is located. The motor shaft 24, the support shaft 70 and the striking shaft 11 are arranged in a plane, so that the electric hammer 300 is compact in overall arrangement and small in overall size. Due to the arrangement of the whole machine, the ratio of the maximum size of the casing 50 in the first linear direction to the maximum size of the casing 50 in the second linear direction can be greater than or equal to 0.5 and less than or equal to 0.8, so that the state of the electric hammer 300 held by a user is matched, the whole electric hammer 300 is lighter, and the electric hammer is suitable for narrow operation space.

In particular, the present invention includes a sensing assembly 40, wherein the sensing assembly 40 is configured to sense the user's actuation and generate an electrical signal a to activate the reciprocating striking motion of the impact mechanism 10 after sensing the actuation. Preferably, the detecting member 40 is disposed on the housing 50 of the first accommodating portion 52, and detects a displacement state of the striking shaft 11 to obtain a user's nail setting motion.

The electric hammer 300 includes a trigger switch 82 for controlling the motor 21 to turn on and off, and the trigger switch 82 is disposed on the housing 50 for a user to hold and control.

Specifically, the striking shaft 11 can move forward to a first position and can move backward to a second position along the first axis 200 relative to the housing 50; when the striking shaft 11 moves backward in the direction of the first axis 200 relative to the housing 50 to the second position or to a third position between the first position and the second position, and the trigger switch 82 is triggered, the motor 21 is activated. It is worth mentioning that the second position is not necessarily the farthest distance that the striking shaft 11 moves back on the first axis 200, but refers to the conventional reciprocating motion of the striking shaft 11 on the first axis 200, and the striking shaft 11 contacts the impact block 12 in the second position. Specifically, the impact direction 15 of the electric hammer 300 is defined as the direction from the second position to the first position.

The electric hammer 300 comprises a detection assembly 40 and a control device 60, wherein the control device 60 is connected with the motor 21 to control whether the motor 21 is started; the detecting assembly 40 includes a state sensor for detecting the displacement of the striking shaft 11, and sends a signal to the control device 60 to control the motor 21 to be started when the striking shaft 11 moves backward in the direction of the first axis 200 to the second position or to a third position between the first position and the second position and the trigger switch 82 is triggered. In some embodiments of the present invention, when the striking shaft 11 contacts the impact block 12, the direct trigger motor 21 is started. Alternatively, in other embodiments of the present invention, after the detection component detects that the striking shaft 11 contacts the impact block 12, the motor 21 is directly triggered to start; alternatively, the detection component detects that the striking shaft 11 contacts the impact block 12, and then sends a signal to the controller, and the controller controls the motor 21 to start, which is not limited herein.

The state sensor is a hall sensor 41, the detecting assembly 40 further includes a first magnetic member 42 disposed opposite to the hall sensor 41, at least a portion of the striking shaft 11 is disposed as a magnetic member, and the displacement state of the striking shaft 11 among the first position, the second position and the third position is detected by the hall sensor 41. The detecting member 40 is fixed to the housing 50 and disposed opposite to the striking shaft 11, and when the striking shaft 11 moves to the first position, the striking shaft 11 and the detecting member 40 are attached to each other. The detecting element 40 detects the striking state of the fastener 100, such as a nail, when the electric hammer 300 is operated, and generates an electrical signal b to stop the reciprocating striking motion of the impact mechanism 10 after detecting that the striking is completed, so as to close the electric hammer 300. In one embodiment, the detection assembly 40 detects the displacement of the striking shaft 11 during the impact, and controls the motor 21 to stop when the variation of the displacement of the striking shaft 11 exceeds a threshold value or the trigger switch 82 is turned off. That is, the variation value of the displacement of the striking shaft 11 is acquired, the first derivative of the displacement of the striking shaft 11 is obtained as a detection value, when the detection value is larger than a threshold value, it is determined that striking is completed, the striking shaft 11 is released, and the electric signal b is sent to control to stop the rotation of the motor 21. It is understood that the motor 21 may be controlled to stop when striking is determined to be completed by taking the first derivative of the speed of displacement of the striking shaft 11 and when the obtained first derivative abruptly changes over a preset threshold.

It should be noted that the state sensor may also be a pressure sensor, an air pressure sensor, a photoelectric sensor, or the like, which can detect the displacement or the motion of the striking shaft 11, and will not be described in detail herein.

The electric hammer 300 further includes a control device 60 connected to the driving mechanism 20, and preferably, the control device 60 includes a circuit board 61 connected to the driving mechanism 20 through the circuit board 61 in a wired or wireless manner, and controls the operation states of the motor 21 of the electric hammer 300, such as start and close states, by controlling the operation of the driving mechanism 20. The detecting component 40 is connected to the circuit board 61, and generates an electrical signal a to the control device 60 after detecting the stapling action, and the control device 60 reads the electrical signal a to control the driving mechanism 20 to operate so as to drive the impact mechanism 10 to reciprocate.

After detecting that the striking shaft 11 is released, the detecting assembly 40 generates and transmits an electric signal b to the control device 60, and further, when the user closes the control trigger switch 82, the detecting assembly also generates and transmits an electric signal b to the control device 60, and the control device 60 controls the driving mechanism 20 to stop to end the striking motion of the electric hammer 300. Through the setting of detection component 40 for motor 21 no longer idles, and the life-span is longer, and the good reliability, and sensitive to user's operation response promotes user operation and experiences, and effectual availability factor that has improved.

It should be noted that the detecting component 40 may also be configured as a mechanical clutch device, that is, the user presses the fixing component 100 to push the detecting component 40 to move, so that the detecting component 40 triggers the motor 21 to operate through the connecting rod or the connecting member, after the fixing component 100 is driven into the substrate, the detecting component 40 is not pushed to move, at this time, the mechanical clutch makes the connecting member or the connecting rod to disengage, the motor 21 stops rotating, and the function of activating the motor 21 to turn on through the displacement of the striking shaft 11 can also be performed, the mechanical clutch is a common technology of those skilled in the art, and details are not described herein.

The striking shaft 11 includes a shaft body 111 and a striking tip 112, the shaft body 111 penetrates the striking tip 112 or extends relatively perpendicularly from both end faces of the striking tip 112 to both sides, and the shaft body 111 fixes the striking tip 112, preferably, the striking tip 112 and the shaft body 111 are integrally formed.

As shown in fig. 6 and 7, the shaft body 111 has a striking end 1111 formed at one end thereof, the striking end 1111 is provided to have a flat bottom surface, and the striking end 1111 is provided inside the striking port to be contacted by the striking end 1111 and strike the firmware 100. The striking end 1111 receives a supporting force of the fastening member 100 and cooperates with the impact mechanism 10 so that the striking shaft 11 can strike reciprocally. As the striking shaft 11 reciprocates, the striking end 1111 reciprocates inside the striking port to drive the fastener 100 into the substrate. It is understood that the shaft body 111 may be configured as a corresponding hollow structure or a solid structure according to the performance requirements of the electric hammer 300.

Preferably, the sensing assembly 40 is disposed near the striking front end 112 and senses the axial displacement of the striking front end 112 to obtain the start action and the work completion status of the electric hammer 300, so as to generate a signal to control the operation and stop thereof.

Referring to fig. 6, the impact mechanism 10 further includes an elastic device 13 and an impact block 12, the elastic device 13 is disposed to be sleeved on the impact block 12, the impact block 12 is sleeved on the supporting shaft 70, the supporting shaft 70 receives the rotational driving force of the driving mechanism 20 and converts the rotational driving force into linear impact motion, and the linear impact motion is transferred to the impact block 12, so as to drive the impact block 12 to perform impact motion, and the impact block 12 impacts the impact shaft 11 to repeatedly hit the fastener 100, so as to drive the fastener 100 into the substrate. Preferably, the elastic device 13 is a spring, and the elastic device 13 is used for assisting the reciprocating impact motion of the impact block 12 and storing and providing part of the energy of the impact motion generated by the impact block 12. In order to increase the impact force of the impact block 12, the stiffness coefficient of the elastic device is in the range of 30-45N/mm, so that the elastic force of the elastic device is increased, and the impact force of the impact block 12 is increased.

The impact block 12 has a first catching member provided at the end of the impact body 122 and protruded to the periphery with respect to the impact body 122, and the impact body 122 constituting a body portion of the impact block 12 and serving to impact the impact block 12. The first interception member is used to intercept the fixed elastic means 13 and prevent the elastic means 13 from disengaging from the impact block 12. In the case where the elastic means 13 are embodied as springs, the first interception member has an interception end into which an end of the spring is placed, the interception end assisting in compressing the spring.

The electric hammer 300 further includes a cushion assembly 80 disposed between the impact mechanism 10 and the housing 50, the cushion assembly 80 at least includes a cushion pad 81 and a rubber ring 83, and the cushion pad 81 is disposed between the rubber ring 83 and the impact mechanism 10. More specifically, the damping member 80 is provided at the impact block 12 and the inner impact block 12, which may partially impact the housing 50 when the impact block 12 strikes the impact shaft 11, and the damping member 80 is provided to reinforce the strength of the housing 50 and improve the life span thereof, and has a damping effect on the entire machine. Buffer pad 81 sets up between rubber circle 83 and impact piece 12, and impact piece 12 strikes buffer pad 81, and buffer pad 81 has promoted the lifting surface area of buffer unit 80, the effectual cushioning effect that increases buffer unit 80. Preferably, the rubber ring 83 and the cushion pad 81 are circumferentially disposed on the housing 50. Optionally, the cushion assembly 80 further comprises a fixing member, and the cushion pad 81 and the rubber ring 83 are fixedly connected by the fixing member.

As shown in fig. 5 and 6, the electric hammer 300 further includes a conversion connector 72, and one end of the support shaft 70 is clamped to the transmission mechanism 30 and is immovably fixed to the transmission mechanism 30 so as to be driven by the transmission mechanism 30 to rotate together. The support shaft 70 and the impact block 12 are clamped through the conversion connecting piece 72, and the conversion connecting piece 72 slides between the impact block 12 and the support shaft 70 in a certain track way, so that the relative movement between the support shaft 70 and the impact block 12 is driven, and the rotary motion of the support shaft 70 is converted into the impact reciprocating motion of the impact block 12.

Further, the striking shaft 11 and the impact mechanism 10 are rotatably coupled, and the impact mechanism 10 applies only an impact force to the striking shaft 11 without applying a rotational force.

The conversion coupling 72 is provided as a ball so as to be stably slid between the impact block 12 and the support shaft 70. Correspondingly, the impact block 12 has a receiving groove 121 formed on an inner wall surface thereof, which is formed in a hemispherical shape and is matched in size with the spherical shape of the conversion connector 72, so that the conversion connector 72 can be half or partially inserted into the receiving groove 121 and can slide therein.

The support shaft 70 includes a support shaft body having a guide groove 711 provided on a surface thereof, and is hollow to surround a portion of the striking shaft 11, thereby saving space. The striking shaft 11 is linearly reciprocable relative to the support shaft body toward the striking direction. The guide groove 711 surrounds the support shaft body. Preferably, the guide groove 711 is recessed inward from the outer surface of the support shaft body, and has at least one guide edge, a first transition region and a second transition region, the guide edge being formed at the edge of the guide groove 711, the guide edge being disposed in a curved undulating pattern with the guide groove 711. The guide grooves 711 convert the elevation of their tracks at the first and second transition areas, respectively. The impact direction 15 is defined as downward and corresponds to the relative position low of the guide groove 711.

The guiding grooves 711 located at the first transition area are oppositely disposed at the lowest point of the support shaft body, the guiding grooves 711 located at the second transition area are oppositely disposed at the highest point of the support shaft body, the guiding grooves 711 extend from the first transition area to the second transition area and from the second transition area to the first transition area, so that the guiding grooves 711 surround the support shaft body, and the transition link 72 slides cyclically back and forth on the guiding grooves 711 from the first transition area to the second transition area and back to the second transition area.

The depth of the guiding groove 711 and the spherical radius of the transfer link 72 are matched such that the depth of the guiding groove 711 is slightly larger than or equal to the spherical radius of the transfer link 72, and in the clockwise direction, for example, the guiding groove 711 smoothly moves upward on the track from the first transfer zone to the second transfer zone, and rapidly falls down from the second transfer zone to the first transfer zone in the clockwise direction. The switching link 72 slides in the guide groove 711 around the support shaft 70 and is restricted by the guide groove 711 having a different height in the support shaft 70 according to the rotation, thereby changing the relative up-down position.

By installing the conversion connecting piece 72 in the receiving groove 121 and the guiding groove 711, because the impact block 12 is sleeved on the outer ring of the supporting shaft 70 and the conversion connecting piece 72 limits the relative movement of the impact block 12 and the supporting shaft 70, the receiving groove 121 and the guiding groove 711 are not disengaged by the relative displacement, so that the impact block 12 is moved by the sliding track of the conversion connecting piece 72 in the guiding groove 711, and is moved up and down to impact towards the impact direction 15 along with the up and down movement of the conversion connecting piece 72 in the guiding groove 711. Therefore, in actual operation, the click slider is restricted by the guide groove 711 to the reciprocating displacement in the impact direction 15.

Because the groove walls of the accommodating groove 121 and the guide groove 711 are smooth and matched with the form of the conversion connecting piece 72, the conversion connecting piece 72 slides smoothly between the accommodating groove 121 and the guide groove 711, the conversion connecting piece 72 and the impact block 12 transmit impact force through surface contact, and the support shaft 70 transmits energy through line contact, so that the abrasion of the conversion connecting piece 72 is greatly reduced, and the service life of the electric hammer 300 is prolonged.

Correspondingly, the support shaft 70 has a second blocking member 716, the second blocking member 716 is disposed at one end of the support shaft body, the second blocking member 716 is disposed opposite to the first blocking member, and a displacement space of the resilient device 13 is relatively defined by cooperation of the first blocking member and the second blocking member 716, so that the resilient device 13 is confined in the impact block 12.

When the striking front end 112 is pressed to trigger the detection assembly 40, the detection assembly 40 sends an electric signal a to the driving mechanism 20, the driving mechanism 20 drives the supporting shaft 70 to rotate at a high speed through the transmission mechanism 30, the rotating supporting shaft 70 drives the clamping sliding block to rotate relatively around the clamping shaft in the accommodating groove 121, and the clamping sliding block is limited to perform reciprocating displacement in the corresponding axial impact direction 15 due to track transformation of the accommodating groove 121, so that the clamped impact block 12 is driven to perform corresponding impact displacement.

When the conversion connecting piece 72 slides from the first conversion area to the second conversion area, the impact block 12 is driven to displace towards the direction opposite to the striking direction, the first interception piece of the impact block 12 compresses the elastic device 13, at the same time, the elastic device 13 is compressed to store the impact energy of the impact block 12, after the conversion connecting piece 72 slides in the accommodating groove 121 to the second conversion area, the impact block 12 is driven to impact displace towards the striking direction, the compressed elastic device 13 decompresses and releases the impact energy to impact with the impact block 12 towards the striking direction together, and the stored energy is transmitted to the impact block 12 through the first interception piece. After the switching link 72 slides again to the first switching zone, the reciprocating impact action is repeated until the detection assembly 40 senses that the striking action is completed, and the control driving mechanism 20 is closed, thereby ending the reciprocating impact action of the impact block 12.

The striking shaft 11 is formed with a force-receiving surface 1121 for contacting with the impact surface 1122 to receive the impact force output from the impact block 12; when the impact surface 1122 and the force-receiving surface 1121 are brought into contact with each other to perform an impact, the ratio of the area of the surface of the force-receiving surface 1121 which is in contact with the impact surface 1122 to the area of the striking surface 1123 is 0.5 or more and 20 or less. Preferably, the force-bearing surface 1121 is a flat surface. Thereby improving the impact strength of the impact block 12 on the striking shaft 11, improving the impact stability and effectively prolonging the service life of the striking shaft 11.

Impact surface 1122 is distant from striking end 1111 with respect to force-receiving surface 1121, and impact block 12 moving in impact direction 15 acts on striking tip 112 and impacts force-receiving surface 1121 to provide impact force to striking shaft 11, and striking end 1111 of striking shaft 11 contacts fastener 100 and strikes fastener 100 into the substrate by impact. The striking surface 1122 is attached to or attracted to the housing 50 of the front end device 14 and attached to or spaced closest from the sensing element 40 when the electric hammer 300 is not operated or the striking shaft 11 impacts the extreme striking direction. Therefore, the striking shaft 11 should be made of a magnetic material at least at the position corresponding to the detecting element 40 on the striking surface 1122.

When a user presses the electric hammer 300, the striking shaft 11 is subjected to the reaction force of the fixing piece 100, after the single striking action is completed, the impact block 12 is driven by the support shaft 70 to compress the elastic device 13, the striking shaft 11 is stressed to move in the reverse direction of the impact direction 15, the elastic device is compressed until the impact block 12 impacts again, the striking shaft 11 is stressed again to strike the fixing piece 100, and the operation is repeated until the striking is completed.

When the detecting assembly 40 is configured to sense the nailing motion of the user on the hall principle and the nailing completion state, further, the striking shaft 11 can move to the first position and the second position along the first axis 200 relative to the casing 50; when the striking shaft 11 moves to the first position, the impact block 12 is disengaged from the striking shaft 11; when the striking shaft 11 moves to the second position, the impact block 12 can contact the striking shaft 11 to output an impact force. According to the above characteristics, the electric hammer 300 is designed to further include the holding device 90 that can generate a holding force that drives the striking shaft 11 to be held at the first position; when the striking shaft 11 is subjected to an external force capable of overcoming the holding force, the striking shaft 11 moves from the first position to the second position; the holding device 90 generates a first holding force when the striking shaft 11 is at the first position, and the holding device 90 generates a second holding force when the striking shaft 11 is at the second position, wherein the first holding force is greater than the second holding force.

It is understood that, in other embodiments, when the state sensor portion employs a hall sensor, the striking shaft and the housing may be provided with corresponding magnetic members and ferromagnetic materials, and the principle of generating the first holding force and the second holding force may be the same as the above-described embodiments.

The holding device 90 includes a second type magnetic member 142, and the second type magnetic member 142 is fixed to the housing 50 and disposed opposite to the striking shaft 11, and when the striking shaft 11 moves to the first position, the striking shaft 11 and the second type magnetic member 92 abut against each other. It is understood that the second type magnetic member 92 may be disposed in the same plane as the first type magnetic member 42 of the detection assembly 40. Preferably, in order to ensure the stability and balance of the first and second holding forces, the first and second magnetic members 42 and 92 are provided in plurality and arranged opposite to each other two by two, respectively. Preferably, the first magnetic members 42 are disposed in two opposite directions, the second magnetic members 92 are also disposed in two opposite directions, and are symmetrically distributed in the housing 50 or a fixing device connected to the housing 50, and due to the arrangement of the magnetic members of the striking shaft 11, the second magnetic members 92 generate a magnetic attraction force to the striking shaft 11, i.e., generate a part of the first holding force and the second holding force, because the first magnetic members 42 and the second magnetic members 92 are designed to be opposite to each other, so that the magnetic attraction force to the striking shaft 11 is uniform. The first type of magnetic member 42 and the second type of magnetic member 92 are preferably magnets.

Note that, here, the striking shaft 11 and the first magnet piece 42 are fitted, and in some embodiments, it means that one surface of the striking shaft 11 and the opposite surface of the first magnet piece 42 are fitted adjacent to each other, that is, a gap, for example, a gap of 0.02mm, exists between them.

Preferably, the first magnetic member 42 and the second magnetic member 92 sink to form a gap with respect to the housing 50, and the height of the gap is set to be within 0.4mm, so that the striking shaft 11 does not directly strike the first magnetic member 42 and the second magnetic member 92 during the striking process, the service life of the first magnetic member 42 and the second magnetic member 92 can be effectively prolonged, and the first magnetic member 42 and the second magnetic member 92 are prevented from being damaged by excessive striking.

Fig. 8 is a graph of the holding force provided by the holding mechanism to be overcome of the electric hammer 300 of fig. 1 versus the displacement of the striking shaft 11; referring to fig. 8, the user puts the fixing member 100 into the nail head supporting shell, and the fixing member 100 supports the striking shaft 11, so that the striking shaft 11 moves from the first position to the second position, and when the fixing member is away from the first position, the magnetic attraction between the first magnetic member 42 and the magnetic material needs to be broken through, as shown in fig. 8, a force mutation is generated, that is, the first holding force needs to be overcome, so that when the user uses the electric hammer 300, an obvious force feedback is generated when striking the fixing member 100, the user can sense the pre-striking state, and the force feedback is generated approximately simultaneously with the starting of the motor 21, thereby facilitating the user to control and use the electric hammer 300.

The holding device 90 further comprises a return elastic member 91, the return elastic member 91 is connected to the striking shaft 11, and the return elastic member 91 provides a part of the second holding force when the striking shaft is at the second position. Optionally, the elastic member is disposed at the end of the shaft body 111 connected to the non-striking end 1111 of the striking shaft 11 and connected to the inner wall of the cavity where the striking shaft 11 is located, and when the electric hammer 300 is not in operation, the reset elastic member 91 fixes the striking shaft 11 in the impact direction 15 by elasticity, and at this time, the striking front end 112 is attached to the detection assembly 40.

The housing 50 includes an outer housing 53 and an inner housing 54, the outer housing 53 is formed on the outermost portion of the power hammer 300 and surrounds the internal components thereof, the outer housing 53 is preferably a plastic housing 50 for the user to hold, and is configured to have a curvature and a texture for the user to hold, so as to facilitate the user to hold. The outer housing 53 has a certain heat insulation effect, and prevents a user from being scalded by heat generated by a tool when the user uses the electric hammer 300. The inner case 54 is formed in the first receiving portion 52 and is located inside the outer case 53. When the detecting assembly 40 is configured to sense the user's motion based on the hall principle, the material of the inner housing 54 cannot be selected from magnetic materials, so as to prevent the inner housing 54 from interfering with the detection result of the hall sensor 41. Preferably, the inner housing 54 is made of aluminum, which has certain heat-conducting and heat-dissipating effects.

The sensing assembly 40 is mounted within the inner housing 54 such that the hall sensor 41 is disposed toward the inner housing 54 relative to the first type magnetic member 42. Detection assembly 40 is disposed near striking head 112 and causes striking head 112 to come into surface contact or closest proximity with first type magnetic element 42 when striking head 112 is impacted down to its limit, which is defined herein as a snug condition. In the process of changing the distance between the striking tip 112 and the first magnetic member 42, since the striking tip 112 is made of ferromagnetic material, it affects the magnetic induction lines generated by the first magnetic member 42, so that the hall sensor captures the distribution transformation state of the magnetic induction lines, converts the distribution transformation state into an electrical signal, and sends the electrical signal to the control device 60, and the control device 60 analyzes the corresponding operation state and controls the driving mechanism 20 to execute the operation.

When the electric hammer 300 is not inserted into the fastener 100, the striking tip 112 is fixed downward, the striking tip 1111 abuts against the tool bushing, and the striking tip 112 moves downward to abut against the detecting member 40 or is closest to the detecting member. Specifically, in a natural state where the electric hammer 300 is not placed in the fastener 100, the striking front end 112 is at the striking direction limit position of the movable range thereof, and the striking surface 1123 of the striking front end 112 is attached to the first type magnetic member 42, because the striking front end 112 is made of at least a part of ferromagnetic material, the striking front end 112 and the first type magnetic member 42 of the detecting element 40 are attracted to each other.

When a user needs to nail the firmware 100 into a base material, the firmware 100 is placed into the striking opening, the striking end 1111 inside the striking opening is jacked up towards the inside of the electric hammer 300 by the firmware 100 with a certain height, at the moment, the striking shaft 11 is driven to move integrally upwards, namely, the firmware moves in a direction away from the striking opening relatively, because the striking shaft 11 is made of a ferromagnetic material, at the moment, the attraction state of the striking front end 112, the first type magnetic member 42 and the second type magnetic member 92 needs to be changed by overcoming the attraction force of the striking front end 112 and the first type magnetic member 42, the attraction state of the striking front end 92 is changed by the user only needing to provide a slight pressure to the electric hammer 300, the attraction states of the striking front end and the striking front end 1111 can be changed, the detection assembly 40 can be activated, the detection assembly 40 senses a starting action and sends an electric signal a to the control device 60 to.

During the reciprocating motion, the relative position of striking front end 112 and detecting component 40 changes along with the reciprocating motion, and detecting component 40 detects the operating state of the hand-held electric device according to the obtained position relation of the two.

After the electric hammer 300 runs to and fro to strike the firmware 100 and strikes the substrate, the striking end 1111 does not receive the reaction force of the firmware 100 any more, so that the reciprocating motion can be stopped in the striking port, the time interval between the striking front end 112 and the joint of the detection assembly 40 is increased, the monitoring value of the activation interval time is set to be m, when the joint state interval between the striking front end 112 and the detection assembly 40 is greater than m, the detection assembly 40 sends an electric signal b to the control device 60, the current impact completion state is judged to belong to, and the driving mechanism 20 is controlled to stop running to finish the impact operation of the electric hammer 300.

The activation interval time m corresponds to the structural specification of the electric hammer 300, and preferably, the activation interval time m is selected to be 0.5s, that is, when the attachment time interval between the striking front end 112 and the detection assembly 40 is greater than 0.5s, the electric signal b is sent to the control device 60 to stop the impact operation of the electric hammer 300.

In one embodiment of the present invention, the end state detection of the electric hammer 300 is implemented to detect the attachment time of the striking head 112 and the detection assembly 40. After the electric hammer 300 runs to and fro to strike the firmware 100 and enter the base material, the striking end 1111 is not blocked by the firmware 100 any more, so that the striking can be stopped from impacting at the striking opening, so that the striking front end 112 is attached to the detection assembly 40, the monitoring value of the activation interval time is set to be n, when the attaching time of the striking front end 112 and the detection assembly 40 is longer than n, the detection assembly 40 sends an electric signal b to the control device 60, the current impact completion state is judged, and the driving mechanism 20 is controlled to stop running to finish the impact operation of the electric hammer 300. Preferably, n is chosen to be 1 s.

Preferably, to enhance the impact force of the electric hammer 300, a striking block is connected to the striking head 112, the striking block is adjacent to the front end 14 relative to the striking head 112, and the striking block and the striking head 112 are integrally formed. The striking block is provided with a cross-sectional radius smaller than that of the striking head 112 so as to be reciprocatingly movable in the striking port without being intercepted by the casing 50 near the front end device 14. The striking block has a thickness to secure the strength of the impact mechanism 10 and to provide a stable impact force.

The front end device 14 is disposed at the end of the first accommodating portion 52 and includes a nail head housing 142 and a positioning member 141, and the positioning member 141 is sleeved on the striking shaft 11 to limit the linear impact motion of the striking shaft 11, so as to ensure the stability of the striking fastener 100 of the electric hammer 300. The staple head housing 142 surrounds to form a striking opening and is used to relatively secure the fastener 100.

Preferably, the impact mechanism 10 includes a staple holding mechanism 144 provided at the nose assembly 14, the staple holding mechanism including a third type of magnetic member 143 for attracting the fastener 100. Holding up nail head shell 142 and setting up fixed nail mechanism 144, when firmware 100 has magnetism nature like the nail, holding up nail head shell 142 and can directly adsorbing firmware 100 at the striking mouth through third type magnetic part 143 to do not need user's manual support firmware 100, make things convenient for user's one-hand operation to use electronic hammer 300, and reduce the injury to the user. It is understood that the first type magnetic member 141, the second type magnetic member 142 and the third type magnetic member 143 may be made of the same material, and are distinguished by different arrangement purposes and positions.

The nail head supporting shell can move relative to the machine shell 50 in the first linear direction, preferably, the nail head supporting shell is connected with the machine shell 50 through the front end elastic piece 145, when a user uses the electric hammer 300 to strike the firmware 100, the base material is compressed along with the driving of the firmware 100 into the base material, and therefore the firmware 100 can be completely driven into the base material.

Preferably, the driving mechanism 20, the power source, and the control device 60 are disposed in the second accommodating portion 51, and the impact mechanism 10 and the support shaft 70 are disposed in the first accommodating portion 52, so that the electric hammer 300 has a uniform structure. And transmits the driving force of the driving mechanism 20 into the first receiving portion 52 through an adapter structure provided between the second receiving portion 51 and the first receiving portion 52. It is understood that one or any combination of the driving mechanism 20, the power source, the control device 60 may be disposed in the first receiving portion 52, and thus the second receiving portion 51 is not necessary in the present invention, and all the internal components may be disposed in the first receiving portion 52.

The motor 21 includes a stator and a rotor, which cooperate to generate an alternating magnetic field and drive the motor shaft 24 to rotate, the rotor is provided with a first type magnetic member 42, and at least one hall sensor 41 is disposed near the rotor, and transmits the detection information to the control device 60, so as to obtain the operation state of the motor 21 and analyze the operation of the electric hammer 300.

The transmission mechanism 30 includes a first gear 31, a second gear 32 and a pair of bevel gears 33 which are engaged, and the first gear 31 and the second gear 32 form a one-stage speed reduction relationship to reduce the rotation speed output by the driving mechanism 20. The first gear 31 engages the transmission shaft 34, the second gear 32 is connected to the support shaft 70, and the bevel gear 33 engages the motor shaft 24 and the transmission shaft 34 to transmit the power of the driving mechanism 20 from the second accommodating portion 51 to the first accommodating portion 52 relatively perpendicular thereto through the bevel gear 33. It should be noted that the relative up-down relationship of the bevel gears 33 can be reversed to achieve the purpose of saving space.

The transmission mechanism 30 further includes a connecting member engaged with the second gear 32, one end of which is engaged with the second gear 32 and the other end of which is connected to a supporting shaft 70 that is not relatively rotatable therewith, so as to connect the supporting shaft 70 and the driving mechanism 20 to be driven thereby, and to drive the supporting shaft 70 to rotate, and to drive the impact block 12 to perform impact motion through energy conversion of the supporting shaft 70.

The electric hammer 300 further comprises a switch for controlling the on/off of the motor 21, preferably, the trigger switch 82, and the trigger switch 82 controls the on/off of the motor 21. in one mode, the power supply can be controlled, before the trigger switch 82 is turned on, the electric hammer 300 cannot run when the power supply is turned off, after the trigger switch 82 is turned on, a user presses the handheld electric firmware 100 through the firmware 100 by exciting the on action, and the detection assembly 40 runs, detects and controls the impact action of the electric hammer 300.

When the starting action is executed, the state process of restraining the magnetic attraction between the striking front end 112 and the second type magnetic piece 92 and separating the striking front end 112 and the second type magnetic piece 92 is easy to obtain, namely the feedback for separating the adsorbed magnetic element is different from the feedback for separating the non-magnetic contact element, so that a user can easily sense the separation state of the striking front end 112 and the second type magnetic piece 92 and can stop pressing, the starting state of the electric hand tool is obtained, and the overall control of the process of using the electric hand tool by the user is facilitated.

It is understood that, in some embodiments of the present invention, the striking shaft 11 may not be completely made of ferromagnetic material, and the ferromagnetic material may be disposed at a position opposite to the first type magnetic member 42, or at a portion of the striking front end 112, so as to correspond to the triggering condition of the detecting component 40. Meanwhile, the detecting component 40 may be disposed on the striking face 1123 of the striking front end 112, and the first type magnetic member 42 may be disposed at a corresponding position of the casing 50, which is not limited herein. It can be understood that, in addition to the signal for turning on the motor 21 generated by detecting the displacement change of the striking shaft 11, other elements linked with the striking shaft 11 may also be detected, and a state sensor is disposed on the other elements linked with the striking shaft 11, so as to obtain the pressing start action of the user by driving the displacement of the other elements through the displacement of the striking shaft 11.

In some embodiments of the present invention, the detecting component 40 is disposed near the top end of the shaft body 111, and the top end of the shaft body 111 is made of ferromagnetic material. When the user performs the opening action, the striking end 1111 of the shaft body 111 is lifted, the detecting component 40 senses the displacement change of the operation state of the shaft body 111, obtains the opening action, and generates an electric signal a to the control device 60 to control the operation of the driving mechanism 20.

The detecting element 40 may also be disposed near the shaft 111, in which the shaft 111 at the corresponding position is made of ferromagnetic material, when a user performs an opening operation, the striking end 1111 of the shaft 111 is jacked up, the detecting element 40 senses a displacement change of an operation state of the shaft 111 to obtain the opening operation, and generates an electrical signal a to the control device 60 to control the operation of the driving mechanism 20.

It will be appreciated that the detection assembly 40 may be disposed at any other location that can sense a user-initiated action, and that automatic acquisition of the user-initiated action is accomplished by disposing a magnetic material at the corresponding location in cooperation therewith.

The utility model discloses an in the embodiment, detecting element also can select not to be restricted to the gyroscope of any quantity, accelerometer, inertia measuring unit to detect through the state position to impact mechanism, acquire user's the action of opening, and arouse actuating mechanism operation in order to begin to strike the action.

In an embodiment of the utility model, the switching axle is set up and has the holding tank, and the corresponding impact piece inner wall setting has the guiding groove to through the conversion connecting piece with the switching axle with strike the piece and be connected and with actuating mechanism's conversion to impact energy.

In an embodiment of the present invention, the electric hammer 300 further includes a tool bushing disposed at the end thereof, preferably, a joint detachably connecting the tool bushing and the front end device, wherein the tool bushing is provided with a receiving member, the tool can be selectively implemented as a hammer head, a chisel head, a shovel head, etc., and detachably connected to the tool bushing to form a hammer, a chisel, a shovel, etc. The tool bushing may removably secure the tool via jaws, threads, etc.

In an embodiment of the present invention, the impact block replaces the striking shaft, and the impact block includes an impact shaft, and at least a portion of the impact block has a magnetic member, and extends to the striking opening from the impact block to the impact direction, and directly strikes the fixing member through the impact shaft. The impact shaft is driven by the support shaft to do reciprocating impact motion.

Fig. 9 is a schematic control flow diagram of the electric hammer 300 according to an embodiment of the present invention. As shown in fig. 9, the operation flow of the tool is as follows, taking the hall sensor 41 as an example of the detection assembly 40, step S1 is executed to press the trigger switch 82, the electric hammer 300 is in a standby state, and the user will execute step S2 to place the firmware 100 into the striking hole and press the electric hammer 300 towards the impact direction 15 to execute step S3 to press the electric hammer 300.

Step S4 is executed, the detecting component detects whether the displacement of the striking shaft leaves the first position, specifically, the electric hammer 300 is pressed by the fixing component 100, the fixing component 100 acts on the striking end 1111 of the striking shaft 11, the striking shaft 11 moves in the direction opposite to the impact direction 15 against the elastic force of the elastic device 13, that is, the striking shaft 11 leaves the first position because of the arrangement of the magnetic material or a part of the magnetic material of the striking shaft 11, the first type magnetic member 42 changes the attaching state with the striking front end 112 due to the displacement of the striking shaft 11, and the two are separated, so as to change the distribution of the magnetic induction lines generated by the first type magnetic member 42, so that the hall sensing device detects the change of the magnetic induction lines, step S5 is executed, the hall sensing device is excited to send the electric signal a to the control device 60, and step S6 is executed, and the control device 60 controls the driving mechanism 20 to operate.

In the operation process of the driving mechanism 20, step S7 is executed, the control device 60 detects whether the driving mechanism 20 is operating normally, if it is detected that the driving mechanism 20 is not operating normally, step S6 is repeated, if it is detected that the driving mechanism is operating normally, step S8 is executed, the detecting module 40 detects whether the displacement change of the striking shaft 11 exceeds the threshold, specifically, after striking is completed, the striking shaft 11 idles due to inertia, the displacement change is suddenly changed compared with the striking process, sudden change data is measured in advance a plurality of times and stored in the control device 60, if the displacement sudden change of the striking shaft 11 exceeds the threshold stored in the control device 60, it is determined that striking is stopped, step S10 is executed to transmit an electric signal b to the control device 60, and the control device 60 controls the driving mechanism 20 to stop operating. At any time, step S9 is executed, the trigger switch 82 is closed, and the drive mechanism 20 is stopped.

Fig. 10 is a schematic diagram illustrating a control flow of the electric hammer 300 according to another embodiment of the present invention. As shown in fig. 10, the operation flow of the tool is as follows, taking the hall sensor 41 as an example of the detection assembly 40, step S11 is executed to press the trigger switch 82, the electric hammer 300 is in the standby state, and the user will execute step S12 to place the firmware 100 into the striking hole and press the electric hammer 300 towards the impact direction 15 to execute step S13 to press the electric hammer 300.

Step S14 is executed, in which the detecting element 40 detects a pressing action, that is, the detecting element detects whether the displacement of the striking shaft is away from the first position, specifically, the electric hammer 300 is pressed by the fixing element 100, the fixing element 100 acts on the striking end 1111 of the striking shaft 11, the striking shaft 11 moves in a direction opposite to the impact direction 15 against the elastic force of the elastic device 13, because the ferromagnetic material or a part of the ferromagnetic material of the striking shaft 11 is arranged, the first type magnetic member 42 changes the attachment state with the striking front end 112 due to the displacement of the striking shaft 11, and separates from the first type magnetic member 42, so as to change the distribution of the magnetic induction lines generated by the first type magnetic member 42, so that the hall sensing device detects the change of the magnetic induction lines, step S15 is executed, the hall sensing device is activated to send an electrical signal a to the control device 60, and step S16 is executed, and the control device 60 controls the.

During the operation of the driving mechanism 20, step S17 is executed, the control device 60 detects whether the driving mechanism 20 is operating normally, if it detects that the driving mechanism is not operating normally, the control device controls the driving mechanism to stop operating, if it detects that the driving mechanism is operating normally, step S18 is executed, the detecting component 40 detects whether the activation interval time is greater than m, if it is greater than m, step S20 is executed to send the electrical signal b to the control device 60, and the control device 60 controls the driving mechanism 20 to stop operating. At any time, step S9 is executed, the trigger switch 82 is closed, and the drive mechanism 20 is stopped.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

It will be understood by those skilled in the art that the embodiments of the present invention as described above and shown in the drawings are given by way of example only and are not limiting of the present invention. The objects of the present invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the embodiments, and the embodiments of the present invention can be modified or altered without departing from the principles.

Claims

1. An electric hammer, comprising:

the striking shaft comprises a striking end which can reciprocate along a first axis and strike a nail during movement, and the striking end is provided with a striking surface which is contacted with the nail;

the impact mechanism is used for impacting the striking shaft to reciprocate;

a motor for driving the impact mechanism;

a housing for supporting the striking shaft, impact mechanism and motor;

wherein the impact mechanism includes:

an impact block having an impact surface for contacting the striking shaft to output an impact force to the striking shaft;

the supporting shaft is used for supporting the impact block;

the striking shaft is provided with a force bearing surface which is used for contacting with the impact surface to receive the impact force output by the impact block;

when the impact surface is in contact with the force bearing surface for impact, the ratio of the area of the surface, attached to the impact surface, of the force bearing surface to the area of the striking surface is greater than or equal to 0.5 and less than or equal to 20.

2. The electric hammer of claim 1, wherein: the stress surface is a plane.

3. The electric hammer of claim 2, wherein: the striking shaft and the impact mechanism form a rotary connection, and the impact mechanism applies impact force to the striking shaft along the first axial direction.

4. The electric hammer of claim 1, wherein: the electric hammer further comprises a buffer assembly arranged between the impact mechanism and the casing, wherein the buffer assembly at least comprises a buffer gasket and a rubber ring, and the buffer gasket is arranged between the rubber ring and the impact mechanism.

5. The electric hammer of claim 1, wherein: the electric hammer comprises an impact block, a support shaft and an electric hammer, wherein the impact block is provided with an accommodating groove, the support shaft is provided with a guide groove which is opposite to the accommodating groove, the electric hammer comprises a moving part which is arranged in the accommodating groove and the guide groove, and the moving part slides in the guide groove to drive the impact block to do reciprocating impact motion.

6. An electric hammer, comprising:

the striking shaft comprises a striking end for striking the nail, and can reciprocate along a first axis;

the impact mechanism is used for outputting impact force to the striking shaft so as to drive the striking shaft to strike the nail;

a motor for driving the impact mechanism;

a housing for supporting the striking shaft, impact mechanism and motor;

wherein the impact mechanism includes:

the impact block is used for impacting the striking shaft in a reciprocating manner;

the supporting shaft is used for supporting the impact block;

the impact block is in surface contact with the striking shaft to transmit the impact force to the striking shaft.

7. The electric hammer of claim 6, wherein at least a portion of the striking shaft is made of a ferromagnetic material.

8. The electric hammer according to claim 6, further comprising a nail holding mechanism disposed at an end of the housing, wherein the nail holding mechanism includes a magnetic member for attracting a fastener.

9. The electric hammer according to claim 6, wherein the striking shaft and the impact mechanism are rotatably coupled, and the impact mechanism applies the impact force to the striking shaft along the first axis.

10. The electric hammer of claim 9, comprising: the electric hammer further comprises a buffer assembly arranged between the impact mechanism and the casing, wherein the buffer assembly at least comprises a buffer gasket and a rubber ring, and the buffer gasket is arranged between the rubber ring and the impact mechanism.

11. The electric hammer of claim 6, wherein: the electric hammer comprises an electric hammer body and is characterized in that the impact block is provided with a guide groove, the support shaft is provided with a containing groove opposite to the guide groove, the electric hammer body comprises a moving part arranged in the containing groove, the moving part is further embedded into the guide groove and can slide in the guide groove, and the moving part drives the impact block to do reciprocating impact motion when sliding in the guide groove.