A high-speed cutting tool

Abstract

The present invention discloses a high-speed cutting tool, including a housing, a driving shaft driven by a motor is rotatably arranged in the housing, a first cam and a second cam are arranged on the driving shaft, a first reciprocating rod and a second reciprocating rod are movably arranged inside the housing, when the driving shaft rotates, the reciprocating motion of the counterweight mechanism is 180° out of phase with the reciprocating motion of the tool mechanism; the counterweight mechanism includes a first connecting rod, the first connecting rod is rotatably matched with one end of the second reciprocating rod through a bearing, and a columnar counterweight is fixedly arranged at both upper and lower ends of the first connecting rod, the counterweight and the sliding bearing are movably matched and the counterweight extends axially along one side of the driving shaft. When the motor of the present invention drives the driving shaft to move at a high speed, since the first and second reciprocating rods are 180° out of phase, the vibrations generated by the first and second reciprocating rods can be offset and the noise is greatly reduced; and since the counterweight extends axially along one side of the driving shaft, the height of the entire housing is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of cutting tools, and more specifically, to a reciprocating cutting tool. Background Art

[0002] Traditional reciprocating cutting tools are often very complex in structure, which is not conducive to reducing the size of the entire tool. Specifically, please refer to the reciprocating cutting tool structure disclosed in the utility model patent with patent application number "CN201320856736.X" and name "Reciprocating Saw", which includes a motor, a housing for accommodating the motor, a frame connected to the housing, and a head housing outside the frame. A guide sleeve is fixed above the frame in the head housing, and a reciprocating rod for connecting the blade is arranged in the guide sleeve. It also includes a set of balancing blocks arranged on the guide sleeve, and a balancing block driving rocker rod for driving the balancing block to reciprocate is symmetrically arranged on the other side of the frame through a pin shaft. The reciprocating rod and the balancing block have the same motion trajectory but opposite motion directions, thereby eliminating the unbalanced force of the reciprocating rod in the reciprocating motion.

[0003] However, in the above structure, the structure in which the balancing block drives the rocker arm and the reciprocating rod to drive the rocker arm to drive the balancing block and the reciprocating rod to move in the guide sleeve is very complicated, and the coordination between the balancing block driving the rocker arm and the reciprocating rod driving the rocker arm and the balancing block and the reciprocating rod vibrates violently when the motor rotates at high speed, which is easy to generate noise. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects in the prior art and provide a high-speed cutting tool.

[0005] The present invention is realized through the following technical scheme: a high-speed cutting tool, comprising a shell, a driving shaft rotatably arranged in the shell, the driving shaft is driven to rotate along the central axis by a motor, a first cam and a second cam are arranged on the driving shaft, a first reciprocating rod and a second reciprocating rod are movably arranged inside the shell, the first cam and the tool mechanism are transmission-connected through the first reciprocating rod, and the second cam and the counterweight mechanism are transmission-connected through the second reciprocating rod; the first cam and the second cam have exactly the same shape and are arranged in opposite directions, so that when the driving shaft rotates, the reciprocating motion of the counterweight mechanism is 180° out of phase with the reciprocating motion of the tool mechanism; the counterweight mechanism comprises a first connecting rod, the first connecting rod is rotatably matched with one end of the second reciprocating rod through a bearing, a columnar counterweight is fixedly arranged at both upper and lower ends of the first connecting rod, the counterweight is movably matched with a sliding bearing fixedly arranged in the shell and the counterweight extends axially along one side of the driving shaft.

[0006] In the above technical solution, the tool mechanism includes a tool shaft, a tool is fixed to the head of the tool shaft through a tool clamp, and the tool shaft is connected to the first reciprocating rod.

[0007] In the above technical solution, a screw hole is provided at the tail end of the tool shaft, and it also includes a joint shaft. A retaining ring is provided on the inner wall of the front end of the joint shaft, and thrust ball bearings are provided on both sides of the retaining ring. A tool shaft connecting pin passes through the joint shaft and is screwed into the screw hole of the tool shaft, and the tool shaft connecting pin presses the two thrust ball bearings; coaxial through holes are provided on the two side walls of the tail end of the joint shaft, and the other end of the first reciprocating rod is rotatably matched with the second connecting rod through a bearing, and the upper and lower ends of the second connecting rod are respectively limited in the through holes provided on the two side walls of the tail end of the joint shaft.

[0008] In the above technical solution, the housing further comprises a tool holder guide sleeve, through which the tool holder guide sleeve provides guidance for the tool holder.

[0009] The present invention has the following beneficial effects: when the motor of the present invention drives the drive shaft to move at high speed, since the phase difference between the first and second reciprocating rods is 180°, the vibrations generated by the first and second reciprocating rods can be offset and the noise is greatly reduced; and since the counterweight extends axially along one side of the drive shaft, the height of the entire shell is greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0011] Figure 2 It is a partial structural schematic diagram of the present invention.

[0012] Figure 3 It is a cross-sectional schematic diagram of the present invention.

[0013] Figure 4 It is a schematic diagram of the three-dimensional structure of the drive shaft.

[0014] Figure 5 for Figure 3 A partial enlarged view of point A in the middle. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Figures 1 to 5A high-speed cutting tool includes a housing 100, a driving shaft 1 is rotatably arranged in the housing 100, the driving shaft 1 is driven to rotate along the central axis by a motor 101, and a first cam 10 and a second cam 11 are arranged on the driving shaft 1. A first reciprocating rod 2 and a second reciprocating rod 3 are movably arranged inside the housing 100, the first cam 10 and the tool mechanism 4 are connected by the first reciprocating rod 2, and the second cam 11 and the counterweight mechanism 5 are connected by the second reciprocating rod 3.

[0016] The first cam 10 and the second cam 11 have exactly the same shape and are arranged in opposite directions, so that when the drive shaft rotates, the phase difference between the reciprocating motion of the counterweight mechanism and the reciprocating motion of the tool mechanism is 180°, thereby eliminating the unbalanced force between the first reciprocating rod and the second reciprocating rod in motion, so that the cutting tool runs smoothly, the vibration is greatly reduced, and the noise is also greatly reduced during operation.

[0017] The counterweight mechanism 5 includes a first connecting rod 50, which is rotatably engaged with one end of the second reciprocating rod 3 through a bearing, and a columnar counterweight 51 is fixedly provided at both upper and lower ends of the first connecting rod 50, and the counterweight 51 is movably engaged with a sliding bearing 52 fixedly provided in the shell; the counterweight 51 extends axially along one side of the drive shaft 1, thereby greatly reducing the height of the entire shell 100 (that is, the axial length of the shell).

[0018] The tool mechanism 4 includes a tool shaft 40, a tool 42 is fixed to the head of the tool shaft 40 through a tool clamp 41, a screw hole is provided at the tail end of the tool shaft 40, and a joint shaft 44 is also included. A retaining ring 44a is provided on the inner wall of the front end of the joint shaft 44, and thrust ball bearings 45 are provided on both sides of the retaining ring 44a. A tool shaft connecting pin 43 passes through the joint shaft 44 and is screwed into the screw hole of the tool shaft 40, and the tool shaft connecting pin 43 presses the two thrust ball bearings 45, and the connection between the joint shaft 44 and the tool shaft 40 is achieved in the above manner. Further, the housing 100 also includes a tool clamp guide sleeve 100a, which provides guidance for the tool clamp 41 to prevent the tool from being offset when cutting back and forth.

[0019] Coaxial through holes 46 are provided on the two side walls at the tail end of the joint shaft 44, and the other end of the first reciprocating rod 2 is rotatably engaged with the second connecting rod 47 through a bearing, and the upper and lower ends of the second connecting rod 47 are respectively limited in the through holes 46 provided on the two side walls at the tail end of the joint shaft 44, and the connection between the joint shaft 44 and the second connecting rod 47 is achieved in the above manner.

[0020] The above shows and describes the basic principle, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments. The above embodiments and descriptions in this application are only the principles of the present invention, and the present invention may have various changes and modifications without departing from the spirit and scope of the present invention. The above changes and modifications all fall within the scope of the present invention claimed.

Claims

1. A high-speed cutting tool, comprising a housing (100), wherein a drive shaft (1) is rotatably arranged in the housing (100), and the drive shaft (1) is driven by a motor (101) to rotate along a central axis, characterized in that: A first cam (10) and a second cam (11) are arranged on the driving shaft (1), and a first reciprocating rod (2) and a second reciprocating rod (3) are movably arranged inside the housing (100); the first cam (10) and the tool mechanism (4) are connected in transmission via the first reciprocating rod (2), and the second cam (11) and the counterweight mechanism (5) are connected in transmission via the second reciprocating rod (3); the first cam (10) and the second cam (11) have exactly the same shape and are arranged in opposite directions, so that when the driving shaft rotates, the phase difference between the reciprocating motion of the counterweight mechanism and the reciprocating motion of the tool mechanism is 180 degrees; the counterweight mechanism (5) comprises a first connecting rod (50), and the first connecting rod (50) ) is rotatably engaged with one end of the second reciprocating rod (3) through a bearing, and columnar counterweights (51) are fixedly arranged at both upper and lower ends of the first connecting rod (50), and the counterweight (51) and the sliding bearing (52) fixedly arranged in the housing are movably engaged, and the counterweight (51) extends axially along one side of the driving shaft (1); the tool mechanism (4) includes a tool shaft (40), and a tool (42) is fixed to the head of the tool shaft (40) through a tool clamp (41), and the tool shaft (40) is connected to the first reciprocating rod (2); the housing (100) also includes a tool clamp guide sleeve (100a), and the tool clamp guide sleeve (100a) provides guidance for the tool clamp (41).

2. A high-speed cutting tool as claimed in claim 1, characterized in that: The tail end of the tool shaft (40) is provided with a screw hole, and also includes a joint shaft (44). A circle of retaining ring (44a) is provided on the inner wall of the front end of the joint shaft (44), and thrust ball bearings (45) are provided on both sides of the retaining ring (44a). A tool shaft connecting pin (43) passes through the joint shaft (44) and is screwed into the screw hole of the tool shaft (40), and the tool shaft connecting pin (43) presses the two thrust ball bearings (45); coaxial through holes (46) are provided on the two side walls of the tail end of the joint shaft (44), and the other end of the first reciprocating rod (2) is rotatably matched with the second connecting rod (47) through a bearing, and the upper and lower ends of the second connecting rod (47) are respectively limited in the through holes (46) provided on the two side walls of the tail end of the tool shaft (40).

Images