CN111250782A

CN111250782A - Portable cutting machine

Info

Publication number: CN111250782A
Application number: CN201811454459.3A
Authority: CN
Inventors: 钟红风; 吉绍山; 张明丛
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2018-11-30
Filing date: 2018-11-30
Publication date: 2020-06-09
Also published as: WO2020108272A1

Abstract

The invention provides a portable cutting machine, which comprises: cutting the slices; the motor is used for driving the cutting blade to rotate, and the rotation axis of the motor is perpendicular to the plane of the cutting blade; a housing including a shroud for covering at least a portion of the cutting blade, a grip portion, and a motor housing for housing the motor; the bottom plate is arranged below the shell, and a groove allowing the cutting blade to pass through is formed in the bottom plate; the plane of the cutting blade is located between the left end face and the right end face of the two axial ends of the motor. By adopting the technical scheme, the cutting blade with larger size can be applied to the portable cutting machine with the linear handle, so that larger cutting depth can be obtained.

Description

Portable cutting machine

Technical Field

The invention belongs to the field of electric cutting tools, and particularly relates to a portable cutting machine.

Background

The portable cutting machine is a common electric cutting tool, and the current direct current portable cutting machines are various and can be roughly divided into two categories. One type of portable cutting machine, shown in fig. 1, is a D-handle portable cutting machine, with the motor axis parallel to the axis of the cutting blade 20. The cutting blade 20 of such portable cutters is typically larger than 165mm in diameter, and the handle 10 is located on the side of the cutting blade 20, which is not easily controllable for hand-held operation.

As shown in fig. 2, the other type is a linear handle portable cutter, the longitudinal direction of the handle 10 coincides with the longitudinal direction of the entire portable cutter, the handle 10 is located at the rear side of the shaft of the cutter blade, the motor 101 is housed in the handle 10, and the axis of the motor 101 is perpendicular to the axis of the cutter blade 20. The motor power of this type of portable cutting machine is small, due to the limited size of the diameter of the handle 10, which limits the choice of motor 101, the diameter of the cutting blade being typically less than 100 mm.

The portable cutting machine with the linear handle has small volume and light weight, and the holding mode accords with the ergonomics and is popular with users. But the power is small, the diameter of the cutting blade is small, the cutting depth is small, and the requirements cannot be met in many occasions.

Disclosure of Invention

To overcome the problems of the prior art, the present invention aims to provide a portable cutting machine having a linear handle and capable of achieving a greater cutting depth with cutting blades having a larger diameter.

The present invention provides a portable cutting machine, comprising:

cutting the slices;

the motor is used for driving the cutting blade to rotate, and the rotation axis of the motor is perpendicular to the plane of the cutting blade;

a housing including a shroud for covering at least a portion of the cutting blade, a grip portion, and a motor housing for housing the motor;

the bottom plate is arranged below the shell, and a groove allowing the cutting blade to pass through is formed in the bottom plate;

the plane of the cutting blade is located between the left end face and the right end face of the two axial ends of the motor.

Preferably, a plane on which the base plate is located is defined as a first plane, and a position where a center of gravity of the portable cutting machine is projected to the first plane in a direction perpendicular to the first plane is located in an area where the grip portion is projected to the first plane in the direction perpendicular to the first plane.

Preferably, the whole of the holding portion extends along the longitudinal direction, and the distance from the center of gravity of the portable cutting machine to the central symmetry plane of the holding portion in the direction perpendicular to the plane of the cutting blade is less than or equal to 40 mm.

Preferably, the motor is located between a left end face of the base plate and a right end face of the base plate.

Preferably, viewed in the axial direction of the cutting blade, the angle between the plane defined by the axis of the motor and the axis of the cutting blade and the base plate is greater than or equal to 20 ° and less than or equal to 65 °.

Preferably, the shield has a circular arc-shaped contour for covering a portion of the cutting blade, and an outer circumferential surface of the motor housing is tangent to or separated from an outer circumferential surface of the shield.

Preferably, a distance between an outer circumferential surface of the motor case and an outer circumferential surface of the shield is less than or equal to 5 mm.

Preferably, on the plane where the cutting blade is located, an included angle between an outer common tangent of the outer peripheral surface of the motor shell and the outer peripheral surface of the shield and the bottom plate is less than or equal to 25 °.

Preferably, on the plane where the cutting blade is located, an included angle between an outer common tangent of the outer peripheral surface of the motor shell and the outer peripheral surface of the shield and the bottom plate is 0-5 °.

Preferably, in the plane of the cutting blade, the included angle between the outer common tangent of the outer peripheral surface of the motor shell and the outer peripheral surface of the shield and the bottom plate is 18-20 °.

Preferably, the portable cutting machine further comprises a transmission mechanism, the rotation of the motor is transmitted to the cutting blade through the transmission mechanism, the transmission mechanism is a multi-stage transmission mechanism, the last stage of the transmission mechanism is speed-increasing transmission, and each stage before the last stage is speed-reducing transmission.

Preferably, the diameter of the cutting blade is greater than or equal to 125mm and less than or equal to 165 mm.

Preferably, the motor is an outer rotor brushless motor, and the power of the motor is 400W to 1000W.

By adopting the technical scheme, the invention provides the portable cutting machine, and the layout structure of the motor of the portable cutting machine can enable the cutting blade with larger size to be applied to the portable cutting machine with the linear handle, so that larger cutting depth is obtained, and higher cutting efficiency is obtained.

Drawings

Fig. 1 shows a schematic structure of a portable cutter in the prior art.

Fig. 2 shows a cross-sectional view of another portable cutter of the prior art.

Fig. 3 shows a schematic configuration of a portable cutter according to a first embodiment of the present invention.

Fig. 4 is a perspective view showing a partial structure of a portable cutter according to a first embodiment of the present invention.

Fig. 5 shows a top view of fig. 4.

Fig. 6 shows a schematic configuration of a portable cutter according to a second embodiment of the present invention.

Fig. 7 shows a schematic configuration of a portable cutter according to a third embodiment of the present invention.

Fig. 8 shows a sectional view of a portable cutter according to a third embodiment of the present invention.

Description of the reference numerals

10 handle 101 motor 20 cutting blade

1 cutting blade

2 motor 21 gear

3 casing 31 fixed shield 32 holding part 321 switch 33 motor casing

4 bottom plate

5 Power supply

6 drive mechanism

Detailed Description

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the detailed description is intended only to teach one skilled in the art how to practice the invention, and is not intended to be exhaustive or to limit the scope of the invention.

In the following embodiments, the front-back direction (longitudinal direction) refers to the front-back direction of the portable cutter, i.e., the direction of movement of the portable cutter when the portable cutter is used, and the left-right direction refers to the left-right direction of the portable cutter, i.e., the direction perpendicular to the front-back direction in the plane to be cut.

First embodiment

As shown in fig. 3 to 5, the present invention provides a portable cutter comprising a cutting blade 1, a motor 2, a housing 3, a base plate 4 and a power source 5, the housing 3 comprising a stationary shield 31 covering at least part of the cutting blade 1, a grip portion 32 and a motor case 33 accommodating the motor 2. The motor 2, the grip portion 32, and the power source 5 are arranged substantially linearly in the front-rear direction. The grip 32 extends in the longitudinal direction of the portable cutting machine to form a substantially columnar handle, the motor 2 is provided at one end of the grip 32 in the longitudinal direction, and the power source 5 is provided at the other end of the grip 32 in the longitudinal direction. It can be understood that the whole of the holding portion 32 is substantially cylindrical, and the surface of the holding portion 32 can be formed into a radian or a depression so as to be suitable for the holding posture of a human hand, so that the holding is more convenient.

The distance from the center of gravity of the portable cutting machine to the central symmetry plane of the grip 32 in a direction perpendicular to the plane of the cutting blade 1 is less than or equal to 40 mm. When holding the portable cutting machine, the center of gravity is close to the central symmetry plane of the holding part 32, so that people feel more stable and comfortable to hold.

The motor case 33 may be cylindrical. The axis of rotation of the motor 2 is perpendicular to the plane of the cutting blade 1. The motor 2 may be an external rotor brushless motor, such motor 2 having a high power density, a small volume and a high power, and the power of the motor may be 400W to 1000W, preferably 550W to 750W, for example 650W.

An end portion of the rotor shaft of the motor 2 protrudes out of the motor case 33, and the end portion of the rotor shaft of the motor 2 is integrally formed with the gear 21. It can be understood that the gear 21 and the rotor shaft are integrally formed, and compared with the gear 21 and the rotor shaft which are connected by key or interference fit, the gear has higher strength and is more suitable for the characteristics of small volume and high power of the outer rotor brushless motor.

The portable cutting machine further comprises a transmission mechanism 6, the rotation of the motor 2 can be transmitted to the cutting blade 1 through the transmission mechanism 6, and the axial direction of the motor 2 is perpendicular to the length direction of the holding part 32.

The transmission mechanism 6 can be a multi-stage transmission mechanism, for example, a three-stage reduction gearbox, the output end of the transmission mechanism 6 is connected with the cutting blade 1 in a matching way, and the input end of the transmission mechanism 6 is connected with the gear 21 of the motor 2 in a matching way. The last stage of the transmission mechanism 6 is speed-up transmission, and each stage before the last stage is speed-down transmission. It can be understood that the last stage is a speed-increasing transmission, and a gear (belt wheel) with a smaller diameter can be coaxially connected with the cutting blade 1, so that the cutting depth of the portable cutting machine is larger.

The cutting blade 1 is disc-shaped, the plane of the cutting blade 1 is perpendicular to the axis of the motor 2, the diameter of the cutting blade 1 can be larger than 100mm, and preferably, the diameter of the cutting blade 1 is larger than or equal to 125mm and smaller than or equal to 165 mm. The radial outside of cutting piece 1 is provided with decides guard shield 31, decides guard shield 31 and has circular-arc profile, and it can shelter from partial cutting piece 1, prevents that cutting piece 1 from causing the injury to the people. It will be appreciated that the size of the motor 2 may be more selected since the motor 2 is not disposed inside the grip portion 32. The power of the motor 2 can be selected to be larger than that of the prior art, and the cutting blade 1 can be selected to be a model with a larger diameter, so that the cutting depth of the portable cutting machine can be larger.

The radial dimension of the cutting blade 1 is larger than that of the motor 2, and the cutting blade 1 is positioned between the left end face and the right end face of the two axial ends of the motor 2.

Bottom plate 4 sets up in the below of deciding guard shield 31, and the groove that supplies cutting piece 1 to pass is seted up to bottom plate 4, and bottom plate 4 and the laminating of the object of waiting to cut, cutting piece 1 can pass the object of waiting to cut of bottom plate 4 cutting. The distance of the cutting blade 1 exposed from the bottom surface of the bottom plate 4 determines the cutting depth of the portable cutting machine. The smaller the distance of the cutting blade 1 exposed from the bottom surface of the bottom plate 4 is, the smaller the cutting depth of the portable cutting machine is, and conversely, the larger the distance of the cutting blade 1 exposed from the bottom surface of the bottom plate 4 is, the larger the cutting depth of the portable cutting machine is.

As shown in fig. 5, the motor 2 is located between the left end surface of the bottom plate 4 and the right end surface of the bottom plate 4, and further, the motor 2 is located between the left side surface of the positioning cover 31 and the right end surface of the bottom plate 4. It will be appreciated that the intermediate position of the motor 2 near the base plate 4 is advantageous in bringing the center of gravity of the entire portable cutting machine close to the grip portion 32.

The motor 2 is located at the radial outer side of the fixed shield 31, the outer peripheral surface of the motor shell 33 is tangent to or separated from the outer peripheral surface of the fixed shield 31, preferably, the distance between the outer peripheral surface of the motor shell 33 and the outer peripheral surface of the fixed shield 31 is less than or equal to 5mm, and the structure of the whole machine can be compact.

In a view along the axial direction of the cutting blade 1, such as shown in fig. 3, the angle between the plane defined by the axis of the motor 2 and the axis of the cutting blade 1 and the bottom plate is ≥ 20 ° and ≤ 65 °, so that the motor 2 is located at a position above the rear end of the cutting blade 1 and the motor 2 is located between the grip portion 32 and the cutting blade 1.

On the plane of the cutting blade 1, the included angle between the outer common tangent of the outer peripheral surface of the motor shell 33 and the outer peripheral surface of the fixed protective cover 31 and the bottom plate is less than or equal to 25 degrees. In this embodiment, the angle is 18 ° to 20 °, and the angle is in this range, and at least part of the motor 2 is located above the positioning guard 31.

The grip portion 32 and the power source 5 are located above the base plate 4, and control elements such as a circuit board and a switch 321 are provided inside the grip portion 32. The switch 321 may be a micro switch or a trigger switch. Preferably, the switch 321 is a trigger switch. It will be appreciated that the microswitch is smaller in size than the trigger switch, and is suitable for use where the interior space of the grip portion 32 is limited. The micro switch is not as capable of passing current as the trigger switch, and there is more sufficient space for the trigger switch in view of the fact that the motor does not have to be provided in the grip portion 32 of the portable cutter of the present invention.

The power source 5 may be a battery that is removably mounted to the grip portion 32. The portable cutting machine is a direct current portable cutting machine, and is convenient to use in various places without being connected with a power line.

The plane on which the base plate 4 is located is defined as a first plane, and the above layout makes it possible to locate a position where the center of gravity of the portable cutting machine is projected onto the first plane in a direction perpendicular to the first plane within a region where the grip portion 32 is projected onto the first plane in a direction perpendicular to the first plane. Further, the position of the center of gravity of the portable cutting machine projected to the first plane in the direction perpendicular to the first plane coincides with the position of the front end of the grip portion 32 projected to the first plane in the direction perpendicular to the first plane, so that the center of gravity of the complete machine is close to the position of the tiger's mouth when the grip portion is held by the hand of a person.

Second embodiment

The overall structure of the portable cutter according to the second embodiment of the present invention is the same as that of the first embodiment. In the present embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in fig. 6, the second embodiment has a different angle between the outer common tangent of the outer peripheral surface of the motor case 33 and the outer peripheral surface of the stationary shroud 31 and the base plate, as compared with the first embodiment, and the angle is 0 ° to 5 ° in the second embodiment. Within this range, the motor 2 is slightly higher than the stationary shield 31 or the motor 2 and the stationary shield 31 are at the same height.

It can be understood that, compared with the first embodiment, the second embodiment has the advantages that the position of the motor 2 is closer to the rear end of the cutting blade 1, and the gravity center position of the whole machine can be changed by adjusting the position of the motor 2, so that the effect of convenient holding is achieved by matching with holding parts of different shapes.

The switch 321 in the second embodiment is different from the switch 321 in the first embodiment, and the switch 321 used in the second embodiment is a microswitch.

Third embodiment

The overall structure of the portable cutter according to the third embodiment of the present invention is the same as that of the first embodiment. In the present embodiment, the same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

As shown in fig. 7 and 8, in the third embodiment, the transmission mechanism 6 includes a belt transmission mechanism and a primary reduction gear box. Specifically, the end of the rotor shaft of the motor 2 is integrally formed with a driving belt pulley, the input end of the primary reduction gearbox is connected with a driven belt pulley, the driving belt pulley and the driven belt pulley are connected through a belt, and the output end of the primary reduction gearbox is connected with the cutting blade 1 in a matched mode.

As shown in fig. 7, the grip portion 32 and the motor case 33 and the housing of the transmission mechanism 6 may be integrally formed.

As shown in fig. 8, the cutting blade 1 and the transmission mechanism 6 are located on each side in the left-right direction of the portable cutting machine, for example, the cutting blade 1 is located on the left side of the portable cutting machine, and the transmission mechanism 6 is located on the right side of the portable cutting machine. The grip portion 32 may be located on one side in the left-right direction of the portable cutter, for example, on the right side of the portable cutter. It can be understood that the holding part 32 is positioned on the left side or the right side of the portable cutting machine, and the influence of the weight of the cutting blade 1 and the transmission mechanism 6 on the gravity center position of the whole machine needs to be considered, so the holding part 32 can also be positioned at the middle position in the left-right direction of the portable cutting machine.

Claims

1. A portable cutter comprising:

cutting the slices;

the motor is characterized in that the plane where the cutting blade is located between the left end face and the right end face of the two axial ends of the motor.

2. The portable cutter according to claim 1, wherein a plane in which the base plate is located is defined as a first plane, and a position where a center of gravity of the portable cutter is projected to the first plane in a direction perpendicular to the first plane is located within a region where the grip portion is projected to the first plane in the direction perpendicular to the first plane.

3. The portable cutting machine according to claim 1, wherein the grip portion extends entirely in the longitudinal direction, and a distance from a center of gravity of the portable cutting machine to a center symmetry plane of the grip portion in a direction perpendicular to a plane of the cutting blade is less than or equal to 40 mm.

4. The portable cutter according to claim 1, wherein the motor is located between a left end face of the base plate and a right end face of the base plate.

5. The portable cutter of claim 1, wherein a plane defined by the axis of the motor and the axis of the cutter blade, as viewed in the axial direction of the cutter blade, forms an angle with the base plate of greater than or equal to 20 ° and less than or equal to 65 °.

6. The portable cutter according to claim 1, wherein the shroud has a contour of a circular arc for covering a part of the cutting blade, and an outer circumferential surface of the motor housing is tangent to or separated from an outer circumferential surface of the shroud.

7. The portable cutter according to claim 6, wherein a distance between an outer peripheral surface of the motor housing and an outer peripheral surface of the shroud is less than or equal to 5 mm.

8. The portable cutter according to claim 6, wherein an angle between an outer common tangent of the outer peripheral surface of the motor housing and the outer peripheral surface of the shroud and the base plate on a plane on which the cutter blade is located is less than or equal to 25 °.

9. The portable cutter according to claim 6, wherein an angle between an outer common tangent of the outer peripheral surface of the motor housing and the outer peripheral surface of the shroud and the base plate is between 0 ° and 5 ° on a plane on which the cutter blade is located.

10. The portable cutter according to claim 6, wherein an angle between an outer common tangent of the outer peripheral surface of the motor housing and the outer peripheral surface of the shroud and the base plate is 18 ° to 20 ° in a plane in which the cutter blades are located.

11. The portable cutter according to claim 1, further comprising a transmission mechanism through which the rotation of the motor is transmitted to the cutting blade, the transmission mechanism being a multi-stage transmission mechanism, the last stage of the transmission mechanism being a speed-increasing transmission, and each stage before the last stage being a speed-decreasing transmission.

12. The portable cutter according to any one of claims 1 to 11 wherein the diameter of the cutting blade is greater than or equal to 125mm and less than or equal to 165 mm.

13. The portable cutter according to any one of claims 1 to 11, wherein the motor is an outer rotor brushless motor, and the power of the motor is 400W to 1000W.