CN116061239A

CN116061239A - Built-in three-stroke high-frequency vibration cutting tool

Info

Publication number: CN116061239A
Application number: CN202310023736.XA
Authority: CN
Inventors: 刘铁生; 卿永洲; 张建斌; 张忠心
Original assignee: Ningbo Jingwei Cnc Co ltd
Current assignee: Ningbo Jingwei Cnc Co ltd
Priority date: 2023-01-09
Filing date: 2023-01-09
Publication date: 2023-05-05

Abstract

The invention provides a built-in three-stroke high-frequency vibration cutting tool, which belongs to the technical field of cutting and comprises: a vibration support; the motor is arranged on the vibration bracket; the cam shaft is connected with the output end of the motor, a stroke concave cavity is formed in the cam shaft, three groups of strokes are arranged on the cavity wall of the stroke concave cavity, each group of strokes comprises a wave crest and a wave trough, the wave crest and the wave trough in each group of strokes are arranged oppositely, and the wave crests and the wave troughs in the three groups of strokes are connected end to end in sequence and are arranged at intervals; one end of the push rod is connected with the cam shaft, the other end of the push rod is connected with the cutting knife, and the push rod is connected with two stroke rollers, when one stroke roller is positioned at the peak position of a stroke, the other stroke roller is positioned at the trough position of the corresponding stroke. According to the invention, under the condition that the output rotating speed of the motor is constant, the vibration frequency of the vibration cutting tool is improved by increasing the stroke number of the push rod in each rotation of the motor, and the service life of the motor is prolonged.

Description

Built-in three-stroke high-frequency vibration cutting tool

Technical Field

The invention belongs to the technical field of cutters, and relates to a cutting tool, in particular to a built-in three-stroke high-frequency vibration cutting tool.

Background

The cutting tool is used for cutting flexible materials such as paper boards or cloth, and the high-frequency vibration cutting tool is used for giving high-frequency vibration to the cutting tool, and the high-frequency vibration is derived from the output of a motor. The up-and-down vibration of the cutting tool is realized through the rotation of the output end of the motor, so that the purpose of cutting is achieved. With the increase of the rotating speed, the vibration frequency of the cutting tool is correspondingly increased, and the rotating speed and the vibration frequency are in a proportional relation.

However, according to the prior art, the maximum rotational speed of the motor is constant, and when the motor reaches the maximum rotational speed, the cutting tool reaches the maximum vibration frequency. If the vibration frequency of the cutting tool is further increased, the motor needs to be replaced, so that the cutting cost is increased, and if the motor is always operated at the maximum rotation speed, the motor is easily damaged, and the service life of the motor is influenced.

Disclosure of Invention

The present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a built-in three-stroke high-frequency vibration cutting tool capable of increasing the vibration frequency without replacing the motor and having a long service life.

The aim of the invention can be achieved by the following technical scheme: a built-in three-stroke high frequency vibration cutting tool comprising:

a vibration support as a carrier;

the motor is arranged on the vibration bracket and used as a power source;

the cam shaft, one end links to each other with the output of the motor, another end links to each other with the stroke structure, and one side that links to each other with the stroke structure on the cam shaft has a stroke cavity, wherein, there are three groups of strokes at least on the cavity wall of the stroke cavity, wherein, each group of strokes includes a crest and a trough, crest and trough in each group of strokes set up relatively, and crest, trough in three groups of strokes link to each other end to end sequentially, and set up at intervals, one end of the stroke structure is matched with rolling of the stroke cavity, another end of the stroke structure is connected with the cutting knife;

the counterweight structure is connected with the camshaft and is respectively positioned at two ends of the camshaft with the stroke structure, one side of the camshaft, which is connected with the counterweight structure, is provided with a counterweight concave cavity, wherein the shape of the counterweight concave cavity is the same as that of the stroke concave cavity, three groups of wave crest and wave trough are also arranged, after any group of wave crest and wave trough in the stroke concave cavity rotates 60 degrees along a vertical plane perpendicular to the output end of the motor, the wave crest and wave trough in the corresponding position in the counterweight concave cavity can be overlapped, one end of the counterweight structure is matched with the counterweight concave cavity in a rolling way, and the other end of the counterweight structure is connected with the vibration bracket.

In the built-in three-stroke high-frequency vibration cutting tool, the counterweight structure comprises a counterweight block connected with the vibration bracket, two counterweight rollers which are distributed up and down are connected to the counterweight block, the two counterweight rollers are contacted with the cavity wall of the counterweight concave cavity, the stroke structure comprises a push rod connected with the cutting tool, and two stroke rollers which are distributed up and down are connected to the push rod, the two stroke rollers are contacted with the cavity wall of the stroke concave cavity, wherein when one of the two stroke rollers is positioned at the peak position of the stroke concave cavity, the counterweight roller corresponding to the stroke roller at the peak position of the two counterweight rollers is exactly positioned at the trough position of the counterweight concave cavity, and when the other one of the two stroke rollers is positioned at the trough position of the stroke concave cavity, the counterweight roller corresponding to the stroke roller at the trough position of the two counterweight rollers is exactly positioned at the peak position of the counterweight concave cavity.

In the built-in three-stroke high-frequency vibration cutting tool, when the wheel center of the camshaft is projected onto the cavity bottom of the counterweight cavity, the projection of the connecting line of the two counterweight rollers in the counterweight cavity bottom passes through the wheel center projection on the counterweight cavity bottom; when the wheel center of the camshaft is projected onto the cavity bottom of the stroke cavity, the projection of the connecting line of the two stroke rollers on the cavity bottom of the stroke cavity passes through the wheel center projection on the cavity bottom of the stroke cavity, wherein the difference between the lengths of the wheel centers projected on the cavity bottom of the counterweight cavity and the lengths of the same group of wave crests and wave troughs are 1mm; the difference between the lengths of the wheel centers projected on the bottom of the stroke concave cavity and the same group of wave crests and wave troughs is 1mm.

In the built-in three-stroke high-frequency vibration cutting tool, the lengths of any straight lines extending to the wall of the stroke cavity are equal through the projection of the wheel center in the bottom of the stroke cavity; the length of any straight line extending to the wall of the counterweight concave cavity through the wheel center projection of the counterweight concave cavity bottom is equal, wherein the distance between the two counterweight rollers is constant, and the distance between the two stroke rollers is constant.

In the built-in three-stroke high-frequency vibration cutting tool, a first connecting shaft and a second connecting shaft are respectively formed at the center of a cam shaft along the axial direction of the cam shaft, the first connecting shaft is in nested fit with the output end of the motor, the push rod is nested in the second connecting shaft, two counterweight rollers are respectively positioned on the upper side and the lower side of the first connecting shaft, and two stroke rollers are respectively positioned on the upper side and the lower side of the second connecting shaft.

In the built-in three-stroke high-frequency vibration cutting tool, the first connecting shaft is provided with a shaft shoulder, and the balancing weight is clamped between the shaft shoulder and the cam shaft.

In the built-in three-stroke high-frequency vibration cutting tool, the second connecting shaft comprises a first shaft section and a second shaft section, the diameter of the first shaft section is larger than that of the second shaft section, the push rod is nested on the first shaft section, the bearing seat is nested on the second shaft section and is connected with the vibration support, and the push rod is clamped between the bearing seat and the cam shaft.

In the built-in three-stroke high-frequency vibration cutting tool, the guide support is arranged on the vibration support, and two guide wheels which are arranged side by side are arranged on the guide support, wherein one end, far away from the cutting tool, of the push rod is clamped between the two guide wheels, and the guide wheels are in rolling fit with the push rod.

In the built-in three-stroke high-frequency vibration cutting tool, the bearing seat and the vibration support are provided with the fans, and the air outlet directions of the two fans are mutually perpendicular, wherein the fan arranged on the bearing seat is positioned in the axial direction of the cam shaft, and the fan arranged on the vibration support is positioned in the radial direction of the cam shaft.

Compared with the prior art, the invention has the beneficial effects that:

(1) According to the built-in three-stroke high-frequency vibration cutting tool provided by the invention, under the condition that the output rotating speed of the motor is constant, the number of strokes of the push rod in each rotation of the motor is increased, so that the vibration frequency of the vibration cutting tool is improved, the service life of the motor is prolonged, and the cutting quality of flexible materials is improved;

(2) The two ends of the push rod are respectively equal to the straight lines passing through the cam shaft and compared with the cavity wall of the stroke cavity, and the connecting line between the two stroke rollers is constant and always passes through the cam shaft, so that the two stroke rollers can always contact with the cavity wall of the stroke cavity along with the rotation of the cam shaft and roll along the cavity wall of the stroke cavity, the moving distance of the push rod in the up-and-down moving process is always constant, and the quality and the reliability of the vibration cutting tool on flexible materials are improved;

(3) The cam shaft is clamped between the bearing seat and the output end of the motor, the push rod is clamped between the bearing seat and the cam shaft, and the bearing seat and the motor are both arranged on a vibration bracket of the vibration cutting tool, so that the relative positions of the motor, the cam shaft, the push rod and the bearing seat in the axial direction are fixed, the push rod is prevented from moving along the axial direction, the push rod only moves up and down in the vertical direction under the rotation of the cam shaft and does not move left and right in the axial direction, and the reliability of the vibration cutting tool in cutting is improved;

(4) The guide support is arranged, the guide wheels are arranged between the guides, and one end of the push rod is clamped between the two guide wheels, so that the push rod does not shake radially in the up-and-down moving process, and the reliability of the vibrating cutting tool in cutting is improved;

(5) Through setting up the counter weight structure, avoid the push rod to take place to beat in the reciprocates to can reduce the noise that produces when the camshaft drives the push rod and reciprocate, and then improve the reliability of vibration cutting tool when cutting.

Drawings

Fig. 1 is a schematic view of a built-in three-stroke high frequency vibration cutting tool according to the present invention.

Fig. 2 is a schematic view of a part of the vibration cutting tool shown in fig. 1.

Fig. 3 is a schematic diagram showing a part of the vibration cutting tool shown in fig. 1.

Fig. 4 is a cross-sectional view A-A of the vibratory cutting tool shown in fig. 3.

Fig. 5 is an enlarged view of a portion a in fig. 4.

FIG. 6 is a schematic view of a cam shaft according to a preferred embodiment of the present invention.

FIG. 7 is a schematic view showing the structure of a cam shaft on one side of a stroke cavity in a preferred embodiment of the present invention.

FIG. 8 is a schematic view of a camshaft showing one side of a counterweight cavity in accordance with a preferred embodiment of the invention.

In the figure, 100, a motor; 200. a cam shaft; 210. a stroke cavity; 211. a peak; 212. a trough; 220. a first connecting shaft; 221. a shaft shoulder; 230. a second connecting shaft; 231. a first shaft section; 232. a second shaft section; 240. a counterweight cavity; 300. a stroke structure; 10. a push rod; 320. a stroke roller; 400. a cutting knife; 500. a bearing seat; 600. a vibration support; 610. a guide bracket; 620. a guide wheel; 700. a fan; 800. a counterweight structure; 810. balancing weight; 820. and a counterweight roller.

Detailed Description

The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.

It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is correspondingly changed accordingly.

As shown in fig. 1 to 8, the present invention provides a built-in three-stroke high-frequency vibration cutting tool, comprising:

a motor 100 as a power source;

a cam shaft 200, one end of which is connected with the output end of the motor 100, the other end of which is provided with a stroke cavity 210, and at least three groups of strokes are formed on the cavity wall of the stroke cavity 210, wherein each group of strokes comprises a wave crest 211 and a wave trough 212, the wave crest 211 and the wave trough 212 in each group of strokes are arranged oppositely, and the wave crests 211 and the wave troughs 212 in the three groups of strokes are connected end to end and are arranged at intervals;

the stroke structure 300 comprises a push rod 310, one end of the push rod 310 is connected with one end of the cam shaft 200, which is provided with a stroke concave cavity 210, the other end of the push rod 310 is connected with a cutter 400, one end of the push rod 310, which is connected with the cam shaft 200, is connected with two stroke rollers 320, the two stroke rollers 320 are symmetrically distributed up and down at the joint of the push rod 310 and the cam shaft 200, wherein, two rollers form rolling fit with the cavity wall of the stroke concave cavity 210, the distance between the two stroke rollers 320 is constant, and when one stroke roller 320 is positioned at the peak 211 position of a stroke, the other stroke roller 320 is positioned at the valley 212 position of the corresponding stroke.

It should be noted that, the motor 100 drives the camshaft 200 to rotate, so that the two stroke rollers 320 on the push rod 310 can roll along the cavity wall of the upper stroke concave cavity 210 of the camshaft 200, and the relative distance between the two stroke rollers 320 is always constant, and the position of the camshaft 200 is also always constant, so that the two stroke rollers 320 roll, drive the push rod 310 to move up and down along the direction perpendicular to the output end of the motor 100, and further drive the cutter 400 to move up and down along the direction perpendicular to the output end of the motor 100, thereby realizing cutting of the flexible material.

If the rotational speed of the motor 100 is 3000 rpm, the frequency of the vibrating cutting tool is 3000 hz, i.e., one stroke is completed per revolution of the motor 100. In this embodiment, three strokes are completed every time the motor 100 rotates, and thus, when the rotation speed of the motor 100 is 3000 rpm, the frequency of the vibrating cutter reaches 9000 hz. Thereby greatly increasing the vibration frequency of the vibrating cutting tool.

According to the high-frequency vibration cutting tool provided by the invention, under the condition that the output rotating speed of the motor 100 is constant, the number of strokes of the push rod 310 in each rotation of the motor 100 is increased, so that the vibration frequency of the vibration cutting tool is increased, the service life of the motor 100 is prolonged, and the cutting quality of flexible materials is improved.

Further preferably, a first connecting shaft 220 and a second connecting shaft 230 are respectively formed at the center of the cam shaft 200 along the axial direction of the cam shaft 200, the first connecting shaft 220 is in nested fit with the output end of the motor 100, the second connecting shaft 230 is in nested fit with the push rod 310, wherein a shaft shoulder 221 is arranged on the first connecting shaft 220, and a bearing is arranged between the shaft shoulder 221 and the output end of the motor 100; the second connecting shaft 230 includes a first shaft section 231 and a second shaft section 232, the diameter of the first shaft section 231 is larger than that of the second shaft section 232, the push rod 310 is nested on the first shaft section 231, and the bearing seat 500 is nested on the second shaft section 232.

In this embodiment, the camshaft 200 is clamped between the bearing seat 500 and the output end of the motor 100, the pushrod 310 is clamped between the bearing seat 500 and the camshaft 200, and the bearing seat 500 and the motor 100 are both mounted on the vibration bracket 600 of the vibration cutting tool, so as to fix the relative positions of the motor 100, the camshaft 200, the pushrod 310 and the bearing seat 500 in the axial direction, avoid the pushrod 310 moving in the axial direction, enable the pushrod 310 to only move up and down in the vertical direction under the rotation of the camshaft 200, and not move left and right in the axial direction, thereby improving the reliability of the vibration cutting tool during cutting.

Preferably, a weight structure 800 is nested on the first connecting shaft 220, and the weight structure 800 is clamped between the camshaft 200 and the shoulder 221.

In this embodiment, by providing the weight structure 800, the push rod 310 is prevented from jumping during the up-and-down movement, and the noise generated when the cam shaft 200 drives the push rod 310 to move up-and-down can be reduced, thereby improving the reliability of the vibrating cutting tool during cutting.

Preferably, a counterweight cavity 240 is disposed at an end of the camshaft 200 where the first connecting shaft 220 is located, and the shape of the counterweight cavity 240 is the same as that of the stroke cavity 210, wherein the number of sets of the wave crests 211 and the wave troughs 212 in the counterweight cavity 240 is the same as that of the wave crests 211 and the wave troughs 212 in the stroke cavity 210, and the positions of the wave crests 211 on the counterweight cavity 240 correspond to the positions of the wave troughs 212 in the stroke cavity 210.

Preferably, the counterweight structure 800 includes a counterweight 810 nested on the first connecting shaft 220, and the counterweight 810 is connected and fixed with the vibration bracket 600, wherein two counterweight rollers 820 are connected to the counterweight 810, and the two counterweight rollers 820 are symmetrically disposed up and down along the axis direction of the first connecting shaft 220, the distance between the two counterweight rollers 820 is constant, and the projection of the connection line of the two counterweight rollers 820 on the bottom of the counterweight cavity 240 passes through the center of the cam shaft 200.

It should be noted that when the camshaft 200 is driven by the motor 100 to rotate, when one of the stroke rollers 320 on the push rod 310 is located at the crest 211, the corresponding counter weight roller 820 on the counter weight 810 is located at the trough 212, and when the other stroke roller 320 on the push rod 310 is located at the corresponding trough 212, the corresponding counter weight roller 820 on the counter weight 810 is located at the crest 211, so as to realize the mutual offset of the pressures at two sides of the camshaft 200, ensure the constancy of the position of the camshaft 200, further reduce the noise of the vibrating cutter when cutting the flexible material and improve the cutting quality.

Preferably, the two weight rollers 820 are respectively located at the upper and lower sides of the first connection shaft 220, and the two stroke rollers 320 are respectively located at the upper and lower sides of the second connection shaft 230.

Preferably, the length of any straight line extending to the cavity wall of the stroke cavity 210 at the two ends is equal after passing through the wheel center projection in the cavity bottom of the stroke cavity 210; the center of the wheel passing through the bottom of the counterweight cavity 240 is projected, and the lengths of any straight line extending to the wall of the counterweight cavity 240 at both ends are equal, wherein the distance between the two counterweight rollers 820 is constant, and the distance between the two stroke rollers 320 is constant.

Further preferably, when the center of the cam shaft 200 is projected onto the bottom of the counterweight cavity 240, the projection of the wire of the two counterweight rollers 820 into the bottom of the counterweight cavity 240 passes through the center of the wheel on the bottom of the counterweight cavity 240; when the center of the cam shaft 200 projects onto the bottom of the stroke cavity 210, the projection of the connecting line of the two stroke rollers 320 onto the bottom of the stroke cavity 210 passes through the center projection on the bottom of the stroke cavity 210, wherein the difference between the center of the wheel projected onto the bottom of the counterweight cavity 240 and the lengths of the same group of wave crests and wave troughs is 1mm; the difference between the lengths of the centers of the wheels projected on the bottom of the stroke cavity 210 to the same set of peaks and valleys is 1mm.

It should be noted that, since the straight lines passing through the center of the cam shaft 200 and both ends are equal compared with the straight lines passing through the cavity wall of the stroke cavity 210, respectively, and the connecting line between the two stroke rollers 320 is constant and always passes through the center of the wheel, the two stroke rollers 320 can always contact with the cavity wall of the stroke cavity 210 along with the rotation of the cam shaft 200 and roll along the cavity wall of the stroke cavity 210, thereby ensuring that the moving distance of the push rod 310 is always constant in the up-and-down moving process, and improving the quality and reliability of the vibrating cutting tool on flexible materials.

Preferably, a guiding support 610 is further disposed on the vibration support 600, and two guiding wheels 620 disposed side by side are mounted on the guiding support 610, wherein one end of the push rod 310 far away from the cutting knife 400 is clamped between the two guiding wheels 620, and rolling fit is achieved between the guiding wheels 620 and the push rod 310.

It should be noted that, by arranging the guide support 610 and arranging the guide wheels 620 between the guides, one end of the push rod 310 is clamped between the two guide wheels 620, so that the push rod 310 does not shake radially in the up-and-down moving process, thereby improving the reliability of the vibrating cutting tool during cutting.

Preferably, the fan 700 is mounted on each of the bearing housing 500 and the vibration bracket 600, and the air outlet directions of the two fans 700 are perpendicular to each other, wherein the fan 700 mounted on the bearing housing 500 is located in the axial direction of the camshaft 200, and the fan 700 mounted on the vibration bracket 600 is located in the radial direction of the camshaft 200.

In this embodiment, the fan 700 can timely dissipate the heat generated by the push rod 310 under high-frequency vibration, so as to prolong the service life of the push rod 310.

It should be noted that the description of the present invention as it relates to "first", "second", "a", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may include at least one such feature, either explicitly or implicitly. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. The terms "coupled," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally formed, for example; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A built-in three-stroke high frequency vibration cutting tool, comprising:

a vibration support as a carrier;

the motor is arranged on the vibration bracket and is used as a power source;

the cam shaft is connected with the output end of the motor at one end and connected with the stroke structure at the other end, a stroke concave cavity is formed in one side of the cam shaft connected with the stroke structure, at least three groups of strokes are arranged on the cavity wall of the stroke concave cavity, each group of strokes comprises a wave crest and a wave trough, the wave crest and the wave trough in each group of strokes are oppositely arranged, the wave crest and the wave trough in the three groups of strokes are sequentially connected end to end and are arranged at intervals, one end of the stroke structure is in rolling fit with the stroke concave cavity, and the other end of the stroke structure is connected with a cutting knife;

the counterweight structure is connected with the cam shaft, is respectively positioned at two ends of the cam shaft and is provided with a counterweight concave cavity on one side of the cam shaft, which is connected with the counterweight structure, wherein the shape of the counterweight concave cavity is the same as that of the stroke concave cavity, three groups of wave crests and wave troughs are also arranged, when any group of wave crests and wave troughs in the stroke concave cavity rotate for 60 degrees along a vertical plane perpendicular to the output end of the motor, the wave crests and wave troughs in the corresponding position in the counterweight concave cavity can coincide, one end of the counterweight structure is in rolling fit with the counterweight concave cavity, and the other end of the counterweight structure is connected with the vibration bracket.

2. The built-in three-stroke high-frequency vibration cutting tool according to claim 1, wherein the counterweight structure comprises a counterweight block connected with the vibration bracket, two counterweight rollers which are distributed up and down are connected to the counterweight block, the two counterweight rollers are contacted with the cavity wall of the counterweight cavity, the stroke structure comprises a push rod connected with the cutting tool, two stroke rollers which are distributed up and down are connected to the push rod, the two stroke rollers are contacted with the cavity wall of the stroke cavity, wherein when one of the two stroke rollers is positioned at the peak position of the stroke cavity, the counterweight roller corresponding to the stroke roller at the peak position is positioned at the trough position of the counterweight cavity exactly, and when the other one of the two stroke rollers is positioned at the trough position of the stroke cavity, the counterweight roller corresponding to the stroke roller at the trough position is positioned at the peak position of the counterweight cavity exactly.

3. The built-in three-stroke high frequency vibration cutting tool according to claim 2, wherein when the center of the cam shaft is projected onto the bottom of the counterweight cavity, the projection of the wire connecting the two counterweight rollers in the bottom of the counterweight cavity passes through the center of the wheel on the bottom of the counterweight cavity; when the wheel center of the camshaft is projected onto the cavity bottom of the stroke cavity, the projection of the connecting line of the two stroke rollers on the cavity bottom of the stroke cavity passes through the wheel center projection on the cavity bottom of the stroke cavity, wherein the difference between the lengths of the wheel centers projected on the cavity bottom of the counterweight cavity and the lengths of the same group of wave crests and wave troughs respectively is 1mm; the difference between the lengths of the wheel centers projected on the bottom of the stroke concave cavity and the same group of wave crests and wave troughs is 1mm.

4. The built-in three-stroke high-frequency vibration cutting tool according to claim 2, wherein the length of any straight line extending to the wall of the stroke cavity is equal through the wheel center projection in the bottom of the stroke cavity; the length of any straight line passing through the center projection of the bottom of the counterweight cavity is equal to the length of any straight line extending to the wall of the counterweight cavity at two ends respectively, wherein the distance between two counterweight rollers is constant, and the distance between two stroke rollers is constant.

5. The built-in three-stroke high-frequency vibration cutting tool according to claim 2, wherein a first connecting shaft and a second connecting shaft are respectively formed at the center of the cam shaft in an extending mode along the axial direction of the cam shaft, the first connecting shaft is in nested fit with the output end of the motor, the push rod is nested in the second connecting shaft, two counterweight rollers are respectively located on the upper side and the lower side of the first connecting shaft, and two stroke rollers are respectively located on the upper side and the lower side of the second connecting shaft.

6. The built-in three-stroke high frequency vibration cutting tool according to claim 5, wherein a shoulder is provided on the first connecting shaft, and the weight is clamped between the shoulder and the cam shaft.

7. The tool of claim 5, wherein the second connecting shaft comprises a first shaft section and a second shaft section, the first shaft section has a larger diameter than the second shaft section, the push rod is nested on the first shaft section, the second shaft section is nested with a bearing seat, the bearing seat is connected with the vibration bracket, and the push rod is clamped between the bearing seat and the cam shaft.

8. The built-in three-stroke high-frequency vibration cutting tool according to claim 1, wherein a guide bracket is arranged on the vibration bracket, and two guide wheels arranged side by side are arranged on the guide bracket, wherein one end of the push rod far away from the cutting knife is clamped between the two guide wheels, and the guide wheels are in rolling fit with the push rod.

9. The built-in three-stroke high frequency vibration cutting tool according to claim 7, wherein fans are mounted on the bearing seat and the vibration support, and the air outlet directions of the two fans are perpendicular to each other, wherein the fan mounted on the bearing seat is located in the axial direction of the cam shaft, and the fan mounted on the vibration support is located in the radial direction of the cam shaft.