WO2021088530A1

WO2021088530A1 - Electric hammer tripping mechanism

Info

Publication number: WO2021088530A1
Application number: PCT/CN2020/116121
Authority: WO
Inventors: 段家利; 邱国富
Original assignee: 苏州宝时得电动工具有限公司
Priority date: 2019-11-07
Filing date: 2020-09-18
Publication date: 2021-05-14
Also published as: CN211517390U

Abstract

An electric hammer tripping mechanism (100) comprising an intermediate shaft (110), a transmission gear (130) arranged on the intermediate shaft in a sheathed manner, a tripping pressing plate (140) and a gasket (150) fixedly arranged relative to the intermediate shaft, the tripping pressing plate and the intermediate shaft are arranged in a non-relative-movement manner, a tripping assembly capable of moving relative to the tripping pressing plate in the axial direction of the intermediate shaft is arranged between the tripping pressing plate and the gasket, and the tripping assembly comprises at least one compressed spring (160) which is used for providing pressure required when tripping the tripping pressing plate. Due to the arrangement of the tripping pressing plate and the tripping assembly, the tripping pressing plate is a stable base during tripping, fluctuation of a tripping force value cannot be caused, such that the tripping reliability is improved, and the risk of a user being hurt due to the fact that the torque is increased in the process of being used is avoided. An electric hammer (200) with the electric hammer tripping mechanism is further involved.

Description

Electric hammer tripping mechanism

This application claims the priority of the Chinese patent application whose application date is November 07, 2019 and the application number is 201921914847.5, the entire content of which is incorporated into this application by reference.

Technical field

The utility model belongs to the technical field related to electric hammers, and particularly relates to an electric hammer tripping mechanism.

Background technique

The electric hammer is an electric rotary hammer drill with a safety clutch attached with a pneumatic hammer mechanism. It is composed of motor, gear reducer, impact mechanism, drilling mechanism, overload safety clutch protection device, etc. The electric hammer generally has two functional modes, one is the impact mode (hammer mode) that outputs linear reciprocating motion, and the other It is a drill mode that outputs rotary motion. Of course, the electric hammer can also realize the hammer drill mode with both impact and rotation.

It can be understood that due to the instability of the use environment, during use, sudden changes in the working conditions of the electric hammer will cause the electric hammer to overload or lock, and in severe cases, it will damage the transmission components and even burn the motor. In addition, when the electric hammer is locked The reaction force is also very easy to hurt; at present, most electric hammer tripping devices use transmission gears to drive the tripping fixing plate to rotate through a steel ball, and then the tripping fixing plate drives the bevel gear to rotate to drive the drill bit to work. When the electric hammer is overloaded, the steel ball extruded from the transmission gear can press the tripping fixing plate to compress the tripping inner spring and the tripping outer spring to move down, so as to separate the transmission gear from the tripping fixing plate. The role of.

It can be seen from the above that the above-mentioned electric hammer overload protection tripping device can effectively solve the tripping of the electric hammer under overload or locked-rotor operation. 1, in the existing design, the end of the intermediate shaft 10 of the tripping device has a bevel gear 20, the transmission gear 30 is arranged on the intermediate shaft 10, and the upper pressure plate 102 is located on the upper side of the transmission gear 30, and the trip is fixed. The plate 40 is arranged on the lower side of the steel ball 101 and the upper side of the elastic member 60 in the transmission gear 30; referring to the right half of FIG. 1, in the process of tripping, the tripping fixing plate 40 overcomes the elasticity under the action of the steel ball 101 The member 60 slides along the axial direction by elastic force, thereby causing a trip with the steel ball 101.

However, the above-mentioned electric hammer tripping mechanism is adopted. Since the lower end of the tripping pressure plate is provided with a compression spring, there may be skew when the tripping pressure plate slides down, resulting in unstable tripping torque and affecting normal use. If the tripping force value changes If it is too large, there may be a risk of injury.

Utility model content

Based on this, it is necessary to provide a safe and stable electric hammer tripping mechanism in response to the technical problems existing in the prior art.

Specifically, the electric hammer tripping mechanism includes an intermediate shaft, a transmission gear sleeved on the intermediate shaft, a trip pressure plate, and a washer fixedly arranged relative to the intermediate shaft. The trip pressure plate and the intermediate shaft are arranged without relative movement, so A trip assembly capable of moving relative to the trip pressure plate along the axial direction of the intermediate shaft is provided between the trip pressure plate and the washer, and the trip assembly includes at least one elastic member for providing tripping of the trip pressure plate The pressure required at the time.

As a preferred solution of the present invention, the end of the intermediate shaft has a pinion gear, and the trip pressure plate is arranged on the side of the transmission gear close to the pinion gear.

As a preferred solution of the present invention, a plurality of through holes are provided on the transmission gear, and the trip assembly includes a coupling member at least partially accommodated in the through hole, and a pressure plate abutting against the coupling member, so The elastic member is arranged between the washer and the pressing plate.

As a preferred solution of the present invention, the side surface of the trip pressing plate close to the transmission gear is provided with a first matching portion matching the shape of the coupling member, and an action portion for tripping and abutting with the coupling member.

As a preferred solution of the present invention, the coupling member is configured as a steel ball, the first mating portion includes a plurality of first groove rails capable of accommodating a part of the steel ball, and the action portion is configured to be located between two adjacent A track protrusion between the groove and the track, and the elastic member is designed as a compression spring.

As a preferred solution of the present invention, a second mating portion that matches the shape of the connecting piece is provided on the side surface of the pressing plate close to the connecting piece.

As a preferred solution of the present invention, the second mating portion is configured as a second groove track capable of accommodating a part of steel balls, and the second groove track forms a closed loop.

As a preferred solution of the present invention, the trip pressure plate and the intermediate shaft are connected without relative movement through a coupling member, the intermediate shaft is provided with a first notch, and the trip pressure plate is provided with the first notch. A notch corresponds to a second notch, and the coupling member is engaged between the first notch and the second notch.

As a preferred solution of the present invention, the coupling member is set as a steel ball.

The utility model provides a safe and stable electric hammer.

Specifically, the electric hammer includes a housing, a motor arranged in the housing, a chuck connected to one end of the housing, a rotary motion output mechanism that is connected to the armature shaft of the motor, and a motor that is connected to the armature shaft. Impact motion output mechanism, the impact motion output mechanism includes a cylinder arranged in the housing, a piston that reciprocates in the cylinder, a hammer that transmits impact power through an air cushion under the push of the piston, and a Hammering the striker of the working head clamped in the chuck, the rotational motion output mechanism is used to transmit the rotational motion of the motor to the working head clamped in the chuck; the rotational motion output mechanism includes the aforementioned electric Hammer trip mechanism.

Due to the application of the above technical solutions, the utility model has the following advantages compared with the prior art:

The electric hammer tripping mechanism provided by the utility model connects the tripping pressure plate and the intermediate shaft by means of steel balls, keys or tight fitting, etc., so that there is no relative movement between the two, so that the tripping pressure plate is one at the time of tripping. The stable base will not cause the fluctuation of the tripping force value, thereby improving the reliability of the tripping, and avoiding the risk of injury to the user when the torque becomes larger during use.

Description of the drawings

Fig. 1 is a structural schematic diagram of the working state and the tripping state of the tripping structure when the electric hammer in the prior art works normally.

Figure 2 is a schematic diagram of the internal structure of the electric hammer provided by the utility model.

Fig. 3 is a three-dimensional exploded schematic diagram of the electric hammer tripping mechanism in Fig. 2.

FIG. 4 is a three-dimensional schematic diagram of the trip pressure plate in FIG. 5.

Fig. 5 is a schematic cross-sectional view of the structure of the electric hammer tripping mechanism marked A in Fig. 2 in a non-tripping state.

6 is a schematic cross-sectional view of the structure of the electric hammer tripping mechanism marked A in FIG. 2 in a tripping state.

Detailed ways

Please refer to FIG. 2, the present utility model provides an electric hammer 200. The electric hammer 200 includes a housing 210, a motor 202 erected in the housing, the motor 202 having an armature shaft 204 that outputs rotational motion, and an armature shaft 204 is connected to the rotary motion output mechanism, and the armature shaft 204 is connected to the impact motion output mechanism. The impact motion output mechanism is used to convert the rotational motion of the armature shaft 204 to output linear reciprocating motion through motion conversion. The impact motion output mechanism includes a cylinder 400 arranged in the housing 210, a piston 410 that reciprocates in the cylinder 400, and a ram 420 that reciprocates under the action of an air cushion 412 through the piston 410. The ram 420 is used for impact and impact. The rod 430 and the striker rod 430 transmit the impact force to the working head 510 clamped in the chuck 500.

The rotary motion output mechanism is used to transmit the rotary motion of the armature shaft 204 to the chuck 500 to drive the working head 500 clamped in the chuck to rotate. An armature shaft gear 204a is provided at the end of the armature shaft 204, and the rotational motion output mechanism includes an electric hammer tripping mechanism 100 mated with the armature shaft gear 204a.

3 and 4, the electric hammer tripping mechanism 100 includes an intermediate shaft 110. The end of the intermediate shaft 110 close to the cylinder 400 is provided with a pinion gear 120. Specifically, the pinion gear 120 can be set as a bevel gear, and the bevel gear can be The intermediate shaft 110 is integrally formed or arranged separately for meshing with the large gear 122 sleeved in the cylinder 400; wherein the large gear 122 can be configured as a bevel gear correspondingly, and the large gear 122 can slide with a spline arranged relative to the cylinder 400 The sleeve 402 is engaged for transmission, and the spline sleeve 402 and the cylinder 400 are connected together by a spline structure without relative rotation; the electric hammer tripping mechanism 100 also includes a transmission gear 130 sleeved on the intermediate shaft 110 and located close to the transmission gear 130 The trip pressure plate 140 on the side of the pinion 120 and the washer 150 fixed to the intermediate shaft 110; wherein a trip assembly capable of moving relative to the trip pressure plate 140 along the axial direction of the intermediate shaft 110 is provided between the trip pressure plate 140 and the washer 150 The trip assembly includes at least one elastic member. The elastic member in this embodiment is set as a compression spring 160 for providing the pressure required for the tripping pressure plate 140 to trip. The armature shaft gear 204a meshes with the transmission gear 130 for transmission, and the washer 150 is fixed on the upper intermediate shaft 110 through a clamp ring 170. The compression spring 160 can be configured as a cylindrical compression spring or a conical compression spring, and can also be replaced by other elastic members.

A number of through holes 131 are provided on the transmission gear 130, and the trip assembly includes a coupling at least partially received in the through hole 131, and a pressure plate 155 abutting against the coupling; a compression spring 160 is provided between the washer 150 and the pressure plate 155 between. The coupling member of this embodiment is set as a steel ball 103, and the steel ball 103 is partially received in the through hole 131; the pressure plate 155 is provided on the side of the transmission gear 130 away from the bevel gear 120.

Referring to FIG. 4, the release plate 140 is provided with a central hole 141 and a plurality of first notches 142 communicating with the central hole 141. Correspondingly, a number of second notches 112 are provided on the intermediate shaft 110, and the trip pressing plate 140 and the intermediate shaft 110 are connected by a coupling without relative movement. The coupling member in this embodiment is set as a steel ball 101, and the steel ball 101 is respectively engaged with the first notch 142 and the second notch 112, thereby connecting the intermediate shaft 110 and the trip pressure plate 140 together without relative movement. Relative movement includes no relative rotation or movement along the axial direction. The steel ball 101 in this embodiment can be replaced with a key or other tight fitting methods, so that there is no relative movement between the intermediate shaft 110 and the trip pressure plate 140.

On the side of the trip pressing plate 140 facing the transmission gear 130, a first matching portion is provided for engaging with the steel ball 103 partially exposed in the through hole 131; in this embodiment, the first matching portion includes a plurality of arcs. The groove track 144; and the action part for tripping and abutting with the coupling member, the action part is arranged as a track protrusion 146 located between adjacent groove tracks 144. Correspondingly, the side surface of the pressing plate 155 facing the transmission gear 130 is provided with a second mating part that matches the shape of the steel ball 103. Preferably, the second mating part is configured as a groove track 157 that can accommodate part of the steel ball 103. The groove The track 157 forms a closed loop.

5, in the normal load working process, the rotational movement of the armature shaft gear 204a transmits the torque to the intermediate shaft 110 through the transmission gear 130 meshed with it; the transmission gear 130, the trip pressure plate 140, and the pressure plate 155 are in The pressure of the compression spring 160 and the connection of the steel ball 103 rotate as a whole. Specifically, due to the limitation of the 146 position of the track protrusion of the tripping plate 140, the retarding force cannot make the steel ball 103 climb and trip when the power is normally transmitted. The tripping plate 140 is connected to the intermediate shaft 110 through two steel balls 101. In relative rotation, the transmission gear 130 rotates to drive the tripping pressure plate 140 to rotate. The tripping pressure plate 140 drives the intermediate shaft 110 to rotate through the steel ball 103. The intermediate shaft 110 drives the large gear 122 to rotate through meshing, and the large gear 122 passes through the side of the spline sleeve 402. The spline 402a is connected to drive the spline sleeve 402 to rotate. The spline sleeve 402 drives the cylinder 400, that is, the output shaft, to rotate through the inner circumferential spline 402b, and the output shaft drives the workpiece head 510 to rotate together through the key connection to complete the rotation.

Referring to Figure 6, when the working head 510 encounters a heavy load, the electric hammer trip mechanism 100 is tripped to stop rotating when the working head is stuck, but the motor 202 is still rotating, so that the power can be disconnected, so as not to Rotate the whole machine and cause injury. When tripping, the working head is blocked and stops rotating, the output shaft synchronously stops rotating, and then the spline sleeve 402, the large gear 122, the intermediate shaft 110, and the trip pressing plate 140 all stop rotating. But at this time, the armature shaft gear 204a continues to rotate to drive the intermediate shaft transmission gear 130 to continue to rotate, and the transmission gear rotates relative to the trip pressure plate 140 at this time, driving the steel ball 103 to rotate along the groove track 157 of the trip pressure plate 140 and the pressure plate 155 , When the steel ball 103 moves to the rail protrusion 146 of the trip pressure plate 140, it climbs the slope against the pressure of the compression spring 160, pushes the pressure plate 155 downwards, and compresses the compression spring 160 at the same time. After climbing, the steel ball 103 falls back and the pressure plate 155 returns to the initial position under the action of the compression spring 160 to complete a trip.

In summary, the electric hammer tripping mechanism provided by the present utility model is compared with the prior art, the electric hammer tripping mechanism 100 provided, the tripping pressing plate 140 and the intermediate shaft 110 are passed through steel balls 101, keys or tight fittings, etc. Connected so that there is no relative movement between the two, so that the tripping pressure plate 140 is a stable base when tripping, and will not cause the fluctuation of the tripping force value, thereby improving the reliability of the tripping and avoiding the user's There is a risk of injury due to increased torque during use.

The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, all possible combinations of the various technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, All should be considered as the scope of this specification.

The above-mentioned embodiments only express several implementation modes of the utility model, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the utility model, several modifications and improvements can be made, and these all fall within the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Among them, 10, intermediate shaft; 20, bevel gear; 30, transmission gear; 40, trip pressure plate; 60, compression spring; 100, electric hammer trip mechanism; 101, steel ball; 102, upper pressure plate; 103, steel ball 110, intermediate shaft; 112, second notch; 120, pinion gear; 122, large gear; 130, transmission gear; 131, through hole; 140, tripping plate; 141, center hole; 142, first notch 144, groove track; 146, track protrusion; 150, gasket; 155, pressure plate; 157, groove track; 160, compression spring; 170, clamp ring; 200 electric hammer; 210, housing; 202, motor; 204. Armature shaft; 204a, armature shaft gear; 400, cylinder; 402, spline sleeve; 402a, spline; 402b, spline; 410, piston; 412, air cushion; 420, hammer; 430, striker bar ; 500, chuck; 510, working head;

Claims

An electric hammer trip mechanism, comprising an intermediate shaft, a transmission gear sleeved on the intermediate shaft, a trip pressure plate, and a washer fixedly arranged relative to the intermediate shaft, characterized in that: the trip pressure plate and the intermediate shaft have no relative movement Provided, a trip assembly capable of moving relative to the trip pressure plate along the axial direction of the intermediate shaft is provided between the trip pressure plate and the washer, and the trip assembly includes at least one elastic member for providing a trip pressure The pressure required when the plate is tripped, the tripping pressure plate and the intermediate shaft are connected by a coupling without relative movement, the intermediate shaft is provided with a first notch, and the tripping pressure plate is provided with The first notch corresponds to the second notch, and the coupling member is engaged between the first notch and the second notch.
The electric hammer tripping mechanism according to claim 1, wherein the end of the intermediate shaft has a pinion, and the tripping pressure plate is arranged on a side of the transmission gear close to the pinion.
The electric hammer tripping mechanism according to claim 2, characterized in that: the transmission gear is provided with a plurality of through holes, and the trip assembly includes a coupling member at least partially accommodated in the through hole, and For the pressure plate to which the coupling piece abuts, the elastic member is arranged between the washer and the pressure plate.
The electric hammer tripping mechanism according to claim 3, characterized in that: the side of the tripping pressure plate close to the transmission gear is provided with a first matching portion that matches the shape of the coupling piece, and is used for connecting with The part that trips and abuts.
The electric hammer tripping mechanism according to claim 4, wherein the coupling member is configured as a steel ball, and the first matching portion includes a plurality of first groove rails capable of accommodating a part of the steel ball, and the function The part is arranged as a rail protrusion located between two adjacent first groove rails, and the elastic member is designed as a compression spring.
The electric hammer tripping mechanism according to claim 3, wherein the pressure plate is provided with a second mating portion matching the shape of the connecting member on a side surface close to the connecting member.
The electric hammer tripping mechanism according to claim 6, wherein the second mating portion is configured as a second groove track capable of accommodating part of the steel ball, and the second groove track forms a closed ring.
The electric hammer trip mechanism according to claim 1, wherein the coupling member is configured as a steel ball.
An electric hammer includes a housing, a motor arranged in the housing, a chuck connected to one end of the housing, a rotary motion output mechanism that is connected to the armature shaft of the motor, and a motor that is connected to the armature shaft. Impact motion output mechanism, the impact motion output mechanism includes a cylinder arranged in the housing, a piston that reciprocates in the cylinder, a hammer that transmits impact power through an air cushion under the push of the piston, and a The ram of the working head clamped in the chuck is hammered, and the rotational motion output mechanism is used to transmit the rotational motion of the motor to the working head clamped in the chuck; it is characterized in that the rotational motion output mechanism Including the electric hammer tripping mechanism according to any one of claims 1 to 8.