A kind of electric hammer tripping protection mechanism and electric hammer

Abstract

The present invention discloses an electric hammer tripping protection mechanism and an electric hammer, including a No. 2 gear, a tripping pin, a small bevel tooth and an elastic member, a mounting hole for mounting the small bevel tooth is provided in the middle of the No. 2 gear, the elastic member is installed in the central axis of the small bevel tooth, the tripping pin is vertically inserted in the middle groove of the small bevel tooth, the elastic member abuts against the tripping pin, and a mounting groove for clamping the tripping pin is provided inside the No. 2 gear. In the electric hammer tripping protection mechanism disclosed in the present application, during the movement of the tripping pin, the torque is transmitted to the tripping pin through the No. 2 gear, and then transmitted to the groove in the middle of the small bevel tooth through the tripping pin to realize torque transmission, and the mounting groove on the bottom surface of the No. 2 gear performs torque transmission, and when the torque is greater than a certain value, the tripping pin moves along the arc surface of the No. 2 gear and the groove in the middle of the small bevel tooth 3 until it is separated from the No. 2 gear to realize tripping, the structure is simple, the stability is high, the heat generation during the tripping process is reduced, and the service life of the protection structure is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of electric tools, and in particular to an electric hammer tripping protection mechanism and an electric hammer. Background Art

[0002] Electric hammer plays a very important role in engineering construction and engineering renovation. Electric hammer can realize hammer function and hammer drill function, and the two functions can achieve different construction effects.

[0003] At present, the electric hammer tripping protection structure on the market basically uses multiple steel balls or multiple cylindrical pins to achieve tripping protection. This structure is achieved by the torque of the No. 2 gear driving the steel ball to transfer to the tripping plate, and the tripping plate is then transmitted to the small bevel gear through the flat square. When the torque of the No. 2 gear is greater than a certain value, the steel ball on the No. 2 gear pushes outward through the inclined surface, pushing the tripping plate to move until separation to achieve tripping. This structure is unstable, the parts manufacturing process is complicated, the assembly process is complicated, the maintenance is inconvenient, the assembly and maintenance costs are high, and the tripping generates serious heat, which seriously affects the service life of the tripping protection structure.

[0004] Therefore, how to solve the problem of poor stability and low service life of the existing electric hammer tripping protection structure is a technical problem that needs to be solved urgently by technical personnel in this field. Summary of the invention

[0005] The purpose of the present invention is to provide an electric hammer tripping protection mechanism, which realizes tripping protection by using the existing multiple steel balls or multiple cylindrical pin structures and optimizes the tripping buffer protection installation groove of the second gear. The structure is simple and the stability is high, which reduces the heat generation during the tripping process and increases the service life of the protection structure.

[0006] In order to solve the above technical problems, the present invention provides an electric hammer tripping protection mechanism, including a No. 2 gear, a tripping pin, a small bevel tooth and an elastic member, a mounting hole for installing the small bevel tooth is provided in the middle of the No. 2 gear, the elastic member is installed in the central axis of the small bevel tooth, the tripping pin is vertically inserted in the middle groove of the small bevel tooth, the elastic member is in contact with the tripping pin, and a mounting groove for clamping the tripping pin is provided inside the No. 2 gear.

[0007] Preferably, a circular arc transition surface is provided on one side of the mounting groove.

[0008] Preferably, the maximum depth of the mounting groove is not greater than the radius of the trip pin.

[0009] Preferably, the number of the installation slots is 2 to 8.

[0010] Preferably, the mounting grooves are distributed at equal angles along the center of the second gear.

[0011] Preferably, the release pin is a cylindrical pin or an arc structure pin.

[0012] Preferably, the elastic member is a spring.

[0013] An electric hammer comprises a motor, a gear reducer, a crank-connecting rod impact mechanism, a drill rotation mechanism, a power supply component and the electric hammer tripping protection mechanism as described above.

[0014] The electric hammer tripping protection mechanism provided by the present invention comprises a No. 2 gear, a tripping pin, a small bevel tooth and an elastic member, a mounting hole for mounting the small bevel tooth is provided in the middle of the No. 2 gear, the elastic member is installed in the central axis of the small bevel tooth, the tripping pin is vertically inserted in the middle groove of the small bevel tooth, the elastic member abuts against the tripping pin, and a mounting groove for clamping the tripping pin is provided inside the No. 2 gear. The electric hammer tripping protection mechanism disclosed in the present application realizes the structure of tripping protection by using the existing multiple steel balls or multiple cylindrical pins to optimize the structure into a mounting groove for the tripping of the No. 2 gear. The knob shaft is rotated to a specific angle. At this time, the eccentric part of the knob shaft pushes the top hammer in the direction of the elastic member. The movement of the top hammer drives the tripping pin to move upward. During the movement of the tripping pin, the torque is transmitted to the tripping pin through the No. 2 gear, and then transmitted to the groove in the middle of the small bevel tooth through the tripping pin to realize torque transmission. The mounting groove on the bottom surface of the No. 2 gear performs torque transmission. When the torque is greater than a certain value, the tripping pin will move along the arc surface of the No. 2 gear and the groove in the middle of the small bevel tooth 3 until it is separated from the No. 2 gear to realize tripping. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the overall structure of a specific implementation method provided by the present invention;

[0017] Figure 2 for Figure 1 The schematic diagram of the structure of the second gear is shown;

[0018] Figure 3 for Figure 2 A side sectional view of the structure shown.

[0019] in, Figure 1-Figure 3 middle:

[0020] Gear No. 2—1, mounting hole—101, mounting groove—102, release pin—2, small bevel gear—3, elastic member—4. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Please refer to Figures 1 to 3 , Figure 1 A schematic diagram of the overall structure of a specific implementation method provided by the present invention; Figure 2 for Figure 1 The schematic diagram of the structure of the second gear is shown; Figure 3 for Figure 2 A side sectional view of the structure shown.

[0023] In a specific embodiment provided by the present invention, it mainly includes a second gear 1, a release pin 2, a small bevel gear 3 and an elastic member 4. A mounting hole 101 for mounting the small bevel gear 3 is provided in the middle of the second gear 1, the elastic member 4 is installed in the central axis of the small bevel gear 3, the release pin 2 is vertically inserted in the middle groove of the small bevel gear 3, the elastic member 4 is in contact with the release pin 2, and a mounting groove 102 for clamping the release pin 2 is provided inside the second gear 1.

[0024] Among them, a mounting hole 101 for installing the small bevel gear 3 is provided in the middle of the second gear 1, the elastic member 4 is installed in the central axis of the small bevel gear 3, the release pin 2 is vertically inserted in the middle groove of the small bevel gear 3, the elastic member 4 is in contact with the release pin 2, and a mounting groove 102 for clamping the release pin 2 is provided inside the second gear 1, and the mounting groove 102 of the release pin 2 is used to disengage the release pin 2 and the second gear 1.

[0025] Specifically, in the actual application process, the knob shaft rotates to a specific angle. At this time, the eccentric part of the knob shaft pushes the top hammer toward the elastic member 4. During the movement of the trip pin 4, the torque is transmitted to the trip pin 4 through the second gear 1, and then transmitted to the groove in the middle of the small bevel tooth 3 through the trip pin 4 to realize torque transmission. The mounting groove 102 on the bottom surface of the second gear 1 transmits torque. When the torque is greater than a certain value, the trip pin 2 will move along the arc surface of the second gear 1 and the groove in the middle of the small bevel tooth 3 until it is separated from the second gear 1 to realize tripping.

[0026] In order to optimize the electric hammer tripping protection mechanism in the above embodiment, which has the advantage of making the tripping pin 2 easier to trip, a circular arc transition surface is provided on one side of the mounting groove 102. During the tripping process of the tripping pin 2, the circular arc transition surface of the mounting groove 102 of the second gear 1 has a buffering and guiding effect, so that the tripping pin 2 can be more gently disengaged, reducing the friction between the tripping pin 2 and the second gear 1 and reducing the generation of heat.

[0027] Based on this, the maximum depth of the installation groove 102 is not greater than the radius of the trip pin 2. In order to allow the trip pin 2 to smoothly escape from the installation groove 102, the maximum depth of the installation groove 102 cannot exceed the radius of the trip pin 2 to avoid the trip pin 2 being unable to be released.

[0028] It should be noted that the number of the installation grooves 102 is 2 to 8, and the installation grooves 102 are distributed at equal angles along the center of the second gear 1. During the tripping process of the tripping pin 2, the installation groove 102 of the second gear 1 plays an auxiliary role, and it is the top hammer that really pushes the tripping pin 2 to trip. Therefore, setting the number of the installation grooves 102 to 2 to 8, and the installation grooves 102 are distributed at equal angles along the center of the second gear 1, can ensure that the tripping pin 2 is more gentle during the tripping process, reduce the friction between the tripping pin 2 and the second gear 1, reduce the generation of heat, and extend the service life of the tripping protection structure. Of course, the number of the installation grooves 102 is not limited to the above situation, and the number can be increased if the space operation is met.

[0029] Furthermore, the trip pin 2 is a cylindrical pin or an arc structure pin. Both the cylindrical pin and the arc structure pin have an arc structure. When the trip pin 2 is disengaged from the second gear 1, the arc structure needs to guide and buffer. Therefore, as long as the above effect can be ensured, no specific limitation is made here.

[0030] Finally, it should be noted that the elastic member 4 is a spring. The spring has strong stress and restoring force, and is easier to maintain inherent characteristics during the conversion process between the electric hammer drill function and the hammer function, while also ensuring the conversion of functions at a lower cost.

[0031] An electric hammer comprises a motor, a gear reducer, a crank-connecting rod impact mechanism, a drill turning mechanism, a power supply assembly and the electric hammer tripping protection mechanism as described above. The composition and use of the electric hammer tripping protection mechanism are the same as those described above and will not be described in detail here.

[0032] To sum up, the electric hammer tripping protection mechanism provided in this embodiment mainly includes a No. 2 gear, a tripping pin, a small bevel tooth and an elastic member. A mounting hole for installing the small bevel tooth is provided in the middle of the No. 2 gear. The elastic member is installed in the central axis of the small bevel tooth. The tripping pin is vertically inserted in the middle groove of the small bevel tooth. The elastic member is in contact with the tripping pin. A mounting groove for clamping the tripping pin is provided inside the No. 2 gear. The electric hammer tripping protection mechanism disclosed in the present application realizes the structure of tripping protection by using the existing multiple steel balls or multiple cylindrical pins to optimize the structure into a mounting groove for the tripping of the No. 2 gear. The knob shaft is rotated to a specific angle. At this time, the eccentric part of the knob shaft pushes the top hammer in the direction of the elastic member. The movement of the top hammer drives the tripping pin to move upward. During the movement of the tripping pin, the torque is transmitted to the tripping pin through the No. 2 gear, and then transmitted to the groove in the middle of the small bevel tooth through the tripping pin to realize torque transmission. The mounting groove on the bottom surface of the No. 2 gear performs torque transmission. When the torque is greater than a certain value, the tripping pin will move along the arc surface of the No. 2 gear and the groove in the middle of the small bevel tooth 3 until it is separated from the No. 2 gear to realize tripping.

[0033] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tripping protection mechanism for an electric hammer, It is characterized in that The invention comprises a second gear (1), a release pin (2), a small bevel gear (3) and an elastic member (4); a mounting hole (101) for mounting the small bevel gear (3) is provided in the middle of the second gear (1); the elastic member (4) is installed in the middle axis of the small bevel gear (3); the release pin (2) is vertically inserted in the middle groove of the small bevel gear (3); the elastic member (4) is in contact with the release pin (2); and a mounting groove (102) for clamping the release pin (2) is provided inside the second gear (1).

2. The electric hammer tripping protection mechanism according to claim 1, It is characterized in that A circular arc transition surface is provided on one side of the installation groove (102).

3. The electric hammer tripping protection mechanism according to claim 2, It is characterized in that The maximum depth of the installation groove (102) is no greater than the radius of the release pin (2).

4. The electric hammer tripping protection mechanism according to claim 3, It is characterized in that The number of the installation grooves (102) is 2 to 8.

5. The electric hammer tripping protection mechanism according to claim 4, It is characterized in that The installation grooves (102) are distributed at equal angles along the center of the second gear (1).

6. The electric hammer tripping protection mechanism according to claim 5, It is characterized in that The release pin (2) is a cylindrical pin or an arc structure pin.

7. The electric hammer tripping protection mechanism according to claim 1, It is characterized in that The elastic member (4) is a spring.

8. An electric hammer, It is characterized in that The invention comprises a motor, a gear reducer, a crank-connecting rod impact mechanism, a drill rotation mechanism, a power supply component and an electric hammer tripping protection mechanism as claimed in any one of claims 1 to 7.

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