WO2018058931A1

WO2018058931A1 - Electric rubber cutter

Info

Publication number: WO2018058931A1
Application number: PCT/CN2017/079470
Authority: WO
Inventors: 曹建华; 黄敞; 郑勇; 张以山
Original assignee: 中国热带农业科学院橡胶研究所
Priority date: 2016-09-28
Filing date: 2017-04-05
Publication date: 2018-04-05
Also published as: CN107864822A; CN107864822B; MY190037A

Abstract

An electric rubber cutter, comprising a blade (1), a push-pull rod (2), and a handle (3). The push-pull rod (2) makes linear back-and-forth movements under the effect of an actuating apparatus. During a rubber cutting operation, a staff member is required merely to hold the handle (3), the actuating apparatus actuates the push-pull rod (2), and the push-pull rod (2) thus drives the blade (1) to make linear back-and-forth movements for cutting rubber. Compared with the prior art in which rubber is cut by means of manual labor, manual labor intensity is reduced, and the work efficiency and quality of rubber cutting are increased to a certain extent.

Description

Electric tapping machine

The present application claims priority to Chinese Patent Application No. Serial No. No. No. No. No. No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No

Technical field

The invention relates to the technical field of natural rubber tapping, in particular to an electric tapping machine.

Background technique

In the natural rubber industry, the tapping operation is generally performed manually. The tapping knife used in the tapping operation generally adopts a V-shaped or 7-shaped tapping knife. After several decades of training, the technical examination is qualified before the job can be tapped.

The manual tapping technology is difficult and labor intensive. It requires a large number of skilled workers, high labor costs, and the efficiency of tapping and tapping quality will decrease after the fatigue of the staff, and the production requirements cannot be met.

Therefore, how to reduce the technical difficulty of the tapping and the labor intensity, improve the efficiency of the tapping, and greatly save the labor cost, has become a technical problem to be solved by those skilled in the art.

Summary of the invention

In view of this, the present invention provides an electric tapping machine to reduce the technical difficulty and labor intensity of tapping, improve the efficiency of tapping, and greatly save labor costs.

To achieve the above object, the present invention provides the following technical solutions:

An electric tapping machine comprising:

a blade for tapping;

a push-pull rod that drives the blade to reciprocate linearly, and the push-pull rod is driven by a driving device;

A handle that is coupled to the drive.

Preferably, in the above electric power tapping machine, the driving device comprises:

case;

a motor disposed within the housing;

An eccentric wheel, an upper end of the eccentric is connected to the motor, and the eccentric is fixed to the housing by a bearing;

a transmission rod disposed coaxially with the push-pull rod, one end of the transmission rod is provided with a first mounting hole that cooperates with the eccentric wheel, and the other end of the transmission rod is provided with a second installation on the push-pull rod Hole-fitted connection post.

Preferably, in the above electric power tapping machine, the handle is fixedly connected to the housing, the handle is a hollow handle, and a cavity of the handle communicates with a lumen of the housing.

Preferably, in the above electric power tapping machine, the blade is an L-shaped blade, and the blade includes a first blade, a second blade and a third blade, the first blade is connected at one end to the push-pull rod, and the other end is connected One end of the second blade is connected, the other end of the second blade is connected to the third blade, the second blade is a fan blade, and the second blade is a curved blade, the second blade The arc opening direction faces the first blade, the number of the second blades is two, and two of the second blades are oppositely arranged, and the two second blades have a smaller arc edge size One end is connected, the third blade is obliquely arranged toward the first blade, and the number of the third blades is also two.

Preferably, in the above electric power tapping machine, a limiting device for controlling the cutting depth and the cutting thickness of the blade is further included, and the limiting device comprises:

Vertically adjusting the slider, the housing is provided with a first chute for engaging the vertical adjustment slider for sliding the vertical adjustment slider up and down in a direction perpendicular to the push-pull rod, a first adjustment hole for adjusting a position of the vertical adjustment slider in a vertical direction is disposed on the vertical adjustment slider, and a first eccentric bolt is disposed in the first adjustment hole;

a horizontal adjustment slider disposed on a side of the vertical adjustment slider away from the housing, the horizontal adjustment slider including an installation in parallel with the push-pull rod and connected to the vertical adjustment slider a plate and a guide post disposed perpendicularly to the mounting plate, a side of the mounting plate that mates with the vertical adjustment slider is provided with a raised strip, the raised strip is disposed in parallel with the push-pull rod, The vertical adjustment slider is provided with a second sliding slot for engaging the protruding strip for horizontal sliding of the protruding strip, the mounting plate a second adjustment hole for adjusting a position of the horizontal adjustment slider in a horizontal direction, a second eccentric bolt disposed in the second adjustment hole, and a horizontal guide hole disposed in the guide post, the guide a hole perpendicular to the push-pull rod;

a limiting rod, the limiting rod includes a mounting section and a limiting section, wherein the mounting section is inserted into the guiding hole, and a sidewall of the guiding hole is disposed for guiding the mounting section along the guiding a third adjusting hole sliding in the axial direction of the hole, wherein the third adjusting hole is provided with a third eccentric bolt, the limiting segment is inclined downward with respect to the mounting portion, and the end of the limiting segment can be The end of the first blade, the second blade and the third blade abut.

Preferably, in the above electric power tapping machine, the two sides of the housing are provided with a first sliding groove that cooperates with the first protruding strip of the vertical adjusting slider.

Preferably, in the above electric power tapping machine, the length of the first blade near the side of the limiting rod is longer than the length of the first blade away from the side of the limiting rod.

Preferably, in the above electric power tapping machine, the method further comprises:

A guide sleeve is provided in the housing for guiding the reciprocating motion of the push-pull rod and the transmission rod, and the guide sleeve is fixedly connected to the inner wall of the housing.

Preferably, in the above electric power tapping machine, the blades are provided with blades at both sides in the longitudinal direction.

Preferably, in the above electric tapping machine, the housing is provided with a heat dissipation hole, and the handle is provided with a power switch, and an electronic controller is disposed in the cavity of the handle.

It can be seen from the above technical solution that the electric tapping machine provided by the invention comprises a blade, a push-pull rod and a handle, and the push-pull rod is linearly reciprocated under the action of the driving device. During the tapping process, the worker holds the handle, and the driving device drives the push-pull rod to make a linear reciprocating motion, and then the push-pull rod drives the blade to perform a linear reciprocating motion for the tapping operation. When the tapping operation is performed, only the worker holds the handle, and the cutting operation of the blade is realized by driving the push-pull rod by the driving device, which reduces the labor intensity by manual manual tapping in the prior art, and improves the tapping of the rubber to some extent. Work efficiency and quality.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will be implemented BRIEF DESCRIPTION OF THE DRAWINGS The drawings, which are used in the description or the description of the prior art, are briefly described. It is obvious that the drawings in the following description are only some embodiments of the present invention, and no one skilled in the art Other drawings can also be obtained from these drawings.

1 is a schematic structural view of an electric tapping machine according to an embodiment of the present invention;

2 is a cross-sectional view of an electric tapping machine according to an embodiment of the present invention;

3 is a schematic structural view of a blade of an electric tapping machine according to an embodiment of the present invention;

4 is a schematic structural view of a limiting rod of an electric tapping machine according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a vertical adjustment slider of an electric tapping machine according to an embodiment of the present invention; FIG.

6 is a front elevational view of a vertical adjustment slider of an electric rubber tapping machine according to an embodiment of the present invention;

7 is a schematic structural view of a horizontal adjustment slider of an electric tapping machine according to an embodiment of the present invention;

8 is a schematic structural view of a transmission rod of an electric tapping machine according to an embodiment of the present invention;

9 is a schematic structural view of a push-pull rod of an electric tapping machine according to an embodiment of the present invention;

FIG. 10 is a schematic structural diagram of an eccentric wheel of an electric rubber tapping machine according to an embodiment of the present invention.

1, blade, 11, first blade, 12, second blade, 13, third blade, 2, push-pull rod, 3, handle, 4, motor, 5, guide sleeve, 6, power switch, 7, limit device , 71, horizontal adjustment slider, 72, vertical adjustment slider, 73, limit rod, 8, eccentric wheel, 9, transmission rod.

detailed description

The invention discloses an electric tapping machine, which reduces the technical difficulty and manual labor intensity of tapping, improves the efficiency of tapping, and greatly saves labor cost.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

1 is a schematic structural view of an electric tapping machine according to an embodiment of the present invention; FIG. 2 is a cross-sectional view of an electric tapping machine according to an embodiment of the present invention; FIG. 4 is a schematic structural view of a limiting rod of the electric tapping machine according to an embodiment of the present invention; FIG. 5 is a vertical adjusting slider of the electric tapping machine according to an embodiment of the present invention; FIG. 6 is a front view of a vertical adjustment slider of the electric tapping machine according to an embodiment of the present invention; FIG. 7 is a schematic structural view of a horizontal adjustment slider of the electric tapping machine according to an embodiment of the present invention; FIG. 9 is a schematic structural view of a push-pull rod of an electric tapping machine according to an embodiment of the present invention; FIG. 10 is a schematic structural view of an electric eccentric of an electric tapping machine according to an embodiment of the present invention; Schematic.

The invention discloses an electric tapping machine, comprising a blade 1, a push-pull rod 2 and a handle 3.

The blade 1 is used for performing a tapping operation, and the blade 1 is provided with a blade edge;

The push-pull rod 2 is linearly reciprocated under the action of the driving device, and the push-pull rod 2 drives the blade 1 to perform linear reciprocating motion to realize cutting of the bark;

The handle 3 is connected to the driving device, which can facilitate the operation of the electric tapping machine by the worker and avoid damage to the worker.

The tapping action of the blade 1 in the electric tapping machine provided by the solution is realized by a driving device, and the driving device is connected with the power source.

The staff only needs to place the blade 1 in the position to be tapped, and start the driving device. The driving device drives the push-pull rod 2 to make a linear motion, and then the push-pull rod 2 drives the blade 1 to perform linear motion, and the blade 1 automatically cuts the bark without manual work. Apply force to the electric tapping machine, which reduces the labor intensity of the tapping operation.

It is not necessary for the staff to apply force to the blade 1 to realize the cutting of the bark by the electric tapping machine, which can alleviate the fatigue strength of the worker to a certain extent, and the staff can maintain the physical strength for a long time, thereby improving the efficiency and quality of the tapping operation. .

In this solution, the flat cutting type cutting method is adopted, and the blade 1 is parallel cut along the surface of the bark instead of rolling cutting, so that the problem of the old rubber wire wrapping knife can be effectively avoided, and the head and tail cutting is ensured in place.

Preferably, the blade 1 is parallel to the surface of the bark during operation, and the cut bark is in the form of a sheet, the cutting surface is smooth, and there is no debris, thereby ensuring the quality of the glue.

The driving device of the electric tapping machine of the present invention comprises a housing, a motor 4, an eccentric wheel 8 and a transmission rod 9.

The housing protects the motor 4, the eccentric 8, the push-pull rod 2 and the transmission rod 9, and the motor 4 is mounted inside the housing.

The motor 4 drives the eccentric wheel 8 to rotate, and the eccentric wheel 8 drives the transmission rod 9 to move, and the transmission rod 9 The push rod 2 is driven to move, and the motor 4 is a power device of the electric tapping machine. Preferably, the motor 4 is a small high-energy brushless DC motor.

The eccentric wheel 8 functions to connect the motor 4 and the transmission rod 9. One end of the transmission rod 9 is provided with a first mounting hole with which the eccentric wheel 8 is engaged, and the other end is provided with a connecting post that cooperates with the second mounting hole of the push-pull rod. The solution converts the rotation of the motor into a reciprocating motion of the transmission rod 9 via the eccentric 8 . Preferably, the transmission rod 9 is arranged coaxially with the push-pull rod 2.

The upper end of the eccentric wheel 8 is fixedly connected to the motor 4 by screws, and is fixed to the casing through a bearing to prevent polarization of the eccentric wheel 8 during operation of the motor. The lower end of the eccentric wheel 8 is engaged with the first mounting hole of the transmission rod 9, the eccentric wheel The lower end of the 8 is connected to the transmission rod 9, and the lower end of the eccentric 8 is also fixed in the housing by bearings. The bearing can reduce the friction coefficient and polarization coefficient during the rotation of the eccentric wheel to ensure the rotation accuracy.

The push-pull rod 2 has a rectangular parallelepiped shape, one end is connected to the blade by a bolt, and the other end is engaged with the connecting post of the transmission rod 9.

The driving device can also be a hydraulic cylinder, and the linear reciprocating motion of the push-pull rod 2 is realized by the expansion and contraction of the piston rod of the hydraulic cylinder.

The housing is a two-piece housing, and the housing includes a first housing and a second housing. The first housing and the second housing cover the motor 4 and the eccentric 8 to form a closed space.

Preferably, the first housing and the second housing have the same shape, and the connection between the first housing and the second housing is achieved by bolts, which facilitates assembly and disassembly of the first housing and the second housing.

The handle 3 is fixedly connected to the housing, and the handle 3 is a hollow handle, and the cavity of the handle 3 communicates with the inner cavity of the housing. An electronic controller and a power cord are disposed in the hollow handle 3, and are electrically connected to the motor 4 in the housing. Preferably, the handle 3 is integrally formed with the housing, and the handle 3 includes a first handle 3 and a second handle 3. The first handle 3 is integrally formed with the first housing, and the second handle 3 is integrally formed with the second housing. The method can reduce the processing cost of the electric tapping machine.

The blade 1 is an L-shaped blade, and the blade includes a first blade 11, a second blade 12, and a third blade 13. The first blade 11 is connected to the push-pull rod 2 at one end, and the other end is connected to one end of the second blade 12, and the second blade 12 is connected. One end is connected to the first blade 11 and the other end is connected to the third blade 13. One end of the third blade 13 is connected to the second blade 12, and the other end is suspended. The first blade 11, the second blade 12 and the third blade 13 are suspended. The overall composition of the L-shaped blade.

In the present embodiment, the second blade 12 is a fan-shaped blade, and the second blade 12 is a curved blade, that is, the second blade 1 is a combination of a fan shape and an arc shape, and the circular arc opening direction of the second blade 12 faces the first blade. The number of the two blades 12 is two, and the two second blades 12 are oppositely arranged, and the ends of the two second blades 12 having the smaller circular arc sides are connected.

The third blade 13 is disposed obliquely toward the first blade 11, that is, the third blade 13 is projected on the first blade 11 to fall on the plane in which the first blade 11 is located, the third blade 13 is a planar blade, and the third blade 13 is The number is two and is respectively connected to the corresponding second blade 12.

The first blade 11 is used for horizontal cutting of the bark.

This arrangement of the blade 1 enables sheet cutting of the bark, and the second blade 12 and the third blade 13 serve to effectively separate portions of the length of the cut bark from adjacent bark to ensure separation. The cutting surface is smooth.

Preferably, the second blade 12 is also disposed obliquely with respect to the first blade 11, and the oblique direction of the second blade 12 faces the first blade 11.

The angle of inclination of the second blade 12 and the third blade 13 with respect to the vertical direction is 2-3°, ensuring that only the blade edge of the first blade 11 is in contact with the bark and the trunk during the tapping process, avoiding the second blade 12 and the first blade The secondary damage caused by the friction between the three blades 13 and the trunk or bark and the milk tube extrusion.

The electric tapping knife provided by the solution further comprises a limiting device 7 for controlling the cutting depth and the cutting thickness of the blade 1, so as to avoid damage to the gum tree due to the deep cutting depth of the blade 1, and avoiding the excessively thick bark per cut. The bark is consumed quickly.

The limiting device 7 includes a vertical adjustment slider 72, a horizontal adjustment slider 71, and a limit lever 73.

The vertical adjustment slider 72 is arranged in parallel with respect to the push-pull rod 2, and the housing is provided with a first slide that cooperates with the vertical adjustment slider 72 for the vertical adjustment slider 72 to slide up and down in a direction perpendicular to the push-pull rod 2 a slot, the vertical adjustment slider 72 is provided with a first adjustment hole for adjusting the position of the vertical adjustment slider 72 in the vertical direction, and the first adjustment hole is provided with a first eccentric bolt to loosen the first eccentric bolt The vertical adjustment slider 72 slides up and down in the vertical direction, and the sliding direction is perpendicular to the push-pull rod 2;

A horizontal adjustment slider 71 disposed on a side of the vertical adjustment slider 72 away from the housing, the horizontal adjustment slider 71 includes a mounting plate and a mounting plate disposed in parallel with the push-pull rod 2 and connected to the vertical adjustment slider 72 a guiding column vertically arranged on the plate, a side of the mounting plate that cooperates with the vertical adjusting slider 72 is provided with a protruding strip, the protruding strip is arranged in parallel with the push-pull rod 2, and the vertical adjusting slider 72 is provided with the protruding strip a second sliding slot for horizontally sliding the protruding strip, the mounting plate is provided with a second adjusting hole for adjusting the position of the horizontal adjusting slider 71 in the horizontal direction, and the second adjusting hole is provided with a second eccentric bolt, Loosen the second eccentric bolt, the horizontal adjustment slider 71 slides in the horizontal direction, the sliding direction is the same as the movement direction of the push-pull rod 2, and the horizontal guiding hole is arranged in the guiding column, and the guiding hole is perpendicular to the push-pull rod 2, in the present scheme In another embodiment, the protruding strip is disposed on the vertical adjusting slider 72, and the second sliding slot is disposed on the horizontal adjusting slider 71;

The limiting rod 73 is L-shaped and arranged perpendicular to the push-pull rod 2. The limiting rod 73 includes a mounting section and a limiting section. The mounting section is inserted in the guiding hole, and the side wall of the guiding hole is provided for guiding the mounting section along the guiding hole a third adjusting hole that slides in the axial direction of the hole, and a third eccentric bolt is disposed in the third adjusting hole, and the limiting segment is inclined downward with respect to the mounting portion. Here, the mounting segment and the limiting segment are located on the same plane. Upper, but the upper end and the lower end of the limiting section are inclined downward with respect to the upper end and the lower end of the mounting section. For details, see FIG. 4 . Preferably, the downward inclination angle of the limiting section is consistent with the inclination angle of the third blade 13 . The end of the segment can be abutted against the end of the first blade 11, the second blade 12 and the third blade 13, and the end width of the stop segment is equal to the distance between the third blade 13 and the first blade 11.

Adjusting the position of the limiting rod 73 in the vertical direction by the vertical adjusting slider 72, adjusting the position of the limiting rod 73 in the horizontal direction by the mounting plate, and adjusting the position of the limiting rod 73 in the direction perpendicular to the housing through the guiding hole, That is, the limit lever 73 is defined to define the blade 1 in the up, down, front and rear, and left and right directions.

The vertical adjusting slider moves up and down in the vertical direction through the first eccentric bolt and the first adjusting hole, thereby realizing the vertical movement of the limiting rod in the vertical direction, and adjusting the position of the limiting rod and the vertical direction of the blade. The mounting plate can be moved along the length of the push-pull rod 2 through the second eccentric bolt and the second adjusting hole, thereby realizing the movement of the limiting rod along the length of the push-pull rod 2, and adjusting the distance between the limiting rod and the blade. The limiting rod slides back and forth along the guiding hole of the guiding column through the third adjusting hole and the third eccentric bolt, and the limiting rod slides in the guiding hole to adjust the relative position between the end of the limiting rod and the third blade 13. Here, the vertical movement direction is named as the Y-axis direction (vertical direction, up and down motion), the length of the push-pull rod 2 extends in the X-axis direction (horizontal direction, left-right movement), and the length of the second mounting plate extends in the Z-axis direction. Direction (perpendicular to the direction of the housing, moving back and forth), the limit lever can be transported separately on the X-axis, Y-axis and Z-axis Move, realize position adjustment in six directions, adjust the relative position of the limit rod and the blade 1 as needed, ensure the cutting depth and thickness of the tapping operation, avoid the damage of the rubber tree formation layer, and easily meet the tapping index requirements.

In a specific embodiment of the solution, the edges of the raised strips are all circular arcs, and the inner wall of the second sliding slot is also circular arc shaped, and the vertical adjusting slider is closely matched with the first sliding slot, the protruding strip and the second The chutes are closely matched.

In this solution, two first chutes are symmetrically arranged on both sides of the casing, and the worker uses an electric tapping knife to cut from the upper end of the rubber tree to the lower end. When the cutting height is too low, the worker compares the tapping operation from top to bottom. Difficult, at this time, the limiting device can be installed on the first sliding slot on the opposite side, and the blade is replaced, that is, the limiting device and the blade are mirror-symmetrically exchanged, and the tapping direction at this time can facilitate the worker to proceed from the bottom. The tapping operation is carried out to ensure the quality of the tapping.

Preferably, the length of the first blade 11 near the limiting rod 73 is longer than the length of the first blade away from the limiting rod 73. When the blade is mounted on the push-pull rod 2, the second blade 12 and the third blade 13 Closer to the limit rod, ensure that only the second blade edge is in contact with the trunk and bark during the tapping process, avoiding contact between the second and third blade bodies and the trunk or bark, causing secondary injury and milk tube extrusion. Pressure.

In order to further optimize the above technical solution, in an embodiment of the invention, the electric tapping machine further comprises: a guiding sleeve 5.

The guiding sleeve 5 is disposed in the housing to guide and fix the reciprocating motion of the push-pull rod 2 and the transmission rod 9, ensuring that the transmission rod 9 only linearly reciprocates along the X-axis within the guiding sleeve 5, preventing the transmission rod 9 from being in the Y-axis and Vibration on the Z-axis ensures smooth cutting surface and ensures the effect of tapping operation.

Preferably, the guide sleeve 5 is fixedly coupled to the housing, ie the guide sleeve 5 does not move with the movement of the push rod 2 and the transfer rod. The guide sleeve 5 is snap-fitted to the housing.

A heat dissipation hole is arranged on the housing to realize effective heat dissipation of the motor 4 and prolong the service life of the motor 4.

The handle 3 is provided with a power switch 6, the power switch 6 controls the operation of the motor 4, the worker manually presses the power switch 6, the motor 4 is energized, the worker cancels the pressing force of the power switch 6, and the motor 4 is powered off and stops.

The electronic controller is communicatively coupled to the motor 4 to provide a pulsed electrical signal and energy to the motor 4 to regulate the operation of the motor 4.

Since the blade 1 reciprocates during the tapping process, in order to further improve the working efficiency of the electric tapping machine Preferably, the blade is provided on both sides in the longitudinal direction of the blade 1, and further, the blade 1, the second blade 12, and the third blade 13 are provided on both sides with a blade.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those 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 invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but the scope of the invention is to be accorded

Claims

An electric tapping machine, comprising:

Blade for tapping (1);

Driving the blade (1) to make a linear reciprocating push-pull rod (2), the push-pull rod (2) is driven by a driving device;

A handle (3) coupled to the drive.
The electric tapping machine according to claim 1, wherein the driving device comprises:

case;

a motor (4) disposed within the housing;

An eccentric (8), an upper end of the eccentric (8) is coupled to the motor (4), and the eccentric (8) is fixed to the housing by a bearing;

a transmission rod (9) coaxially arranged with the push-pull rod, one end of the transmission rod (9) is provided with a first mounting hole that cooperates with the eccentric (8), and the other end of the transmission rod (9) A connecting post is provided that cooperates with a second mounting hole on the push-pull rod (2).
The electric tapping machine according to claim 2, wherein the handle (3) is fixedly connected to the housing, the handle (3) is a hollow handle, and a cavity and a handle of the handle (3) The inner cavity of the housing is in communication.
The electric tapping machine according to claim 2, characterized in that the blade (1) is an L-shaped blade, the blade comprising a first blade (11), a second blade (12) and a third blade (13) One end of the first blade (11) is connected to the push-pull rod (2), the other end is connected to one end of the second blade (12), and the other end of the second blade (12) is opposite to the first a third blade (13) is connected, the second blade (12) is a fan blade, and the second blade (12) is a curved blade, and a circular arc opening direction of the second blade (12) faces the first a blade, the number of the second blades (12) is two, and two of the second blades (12) are oppositely arranged, and the two second blades (12) have a small arc edge size One end is connected, the third blade (13) is obliquely arranged toward the first blade (11), and the number of the third blades (13) is also two.
The electric tapping machine according to claim 4, further comprising a limiting device (7) for controlling the cutting depth and the cutting thickness of the blade (1), the limiting device (7) comprising:

Vertically adjusting the slider (72), the housing is provided with the vertical adjustment slider (72) for the vertical adjustment slider (72) to be perpendicular to the push-pull rod (2) a first chute sliding up and down in a direction, the vertical adjustment slider (72) being provided with a first adjustment hole for adjusting a position of the vertical adjustment slider (72) in a vertical direction, a first eccentric bolt is disposed in the first adjustment hole;

a horizontal adjustment slider (71) disposed on a side of the vertical adjustment slider (72) remote from the housing, the horizontal adjustment slider (71) including a parallel arrangement with the push-pull rod (2) And a mounting plate connected to the vertical adjusting slider (72) and a guiding post arranged perpendicularly to the mounting plate, the side of the mounting plate that is engaged with the vertical adjusting slider (72) is convex a lifting strip, the protruding strip is arranged in parallel with the push-pull rod (2), and the vertical adjusting slider (72) is provided with the protruding strip for horizontal sliding of the protruding strip a second sliding slot, the mounting plate is provided with a second adjusting hole for adjusting the position of the horizontal adjusting slider (71) in the horizontal direction, and the second adjusting hole is provided with a second eccentric bolt, a horizontal guiding hole is disposed in the guiding column, and the guiding hole is perpendicular to the push-pull rod (2);

a limiting rod (73), the limiting rod (73) includes a mounting portion and a limiting portion, the mounting portion is inserted into the guiding hole, and the side wall of the guiding hole is provided with a third adjusting hole sliding along the axial direction of the guiding hole, wherein the third adjusting hole is provided with a third eccentric bolt, and the limiting segment is inclined downward with respect to the mounting portion, the limit The end of the segment is capable of abutting the end of the first blade (11), the second blade (12) and the third blade (13).
The electric tapping machine according to claim 5, wherein both sides of the housing are provided with a first sliding groove that cooperates with the first protruding strip of the vertical adjusting slider (72).
The electric tapping machine according to claim 5, wherein a length of the first blade (11) near a side of the limiting rod (73) is farther from the first blade (11) than the limit The length of one side of the rod (73) is long.
The electric tapping machine according to claim 2, further comprising:

a guide sleeve (5) for guiding the reciprocating motion of the push-pull rod (2) and the transmission rod (9) in the housing, the guide sleeve (5) being fixedly connected to the inner wall of the housing .
The electric tapping machine according to claim 1, characterized in that the blades (1) are provided with cutting edges on both sides in the longitudinal direction.
The electric tapping machine according to claim 2, wherein the housing is provided with a heat dissipation hole, and the handle (3) is provided with a power switch (6), and the cavity of the handle is provided with an electron Controller.