Cutting device

Abstract

A cutting device is provided with a working head, the cutting device comprises a shell, a driving assembly contained in the shell and a protective cover assembly at least partially covering the working head, the working head is located at the axial front end of the driving assembly and driven by the driving assembly to rotate, and the protective cover assembly is connected to the shell; the working head is characterized in that the protective cover assembly comprises a first protective cover made of a first material and a second protective cover made of a second material, the second protective cover is attached to the end of the first protective cover and arranged at the tangential position of cuttings generated when the working head cuts the workpiece to be machined, and the melting point of the second protective cover is higher than that of the first protective cover. Through the arrangement, the second protective cover is attached to prevent high-temperature cuttings from directly contacting the inner wall of the first protective cover to damage the first protective cover; further, the first shield is made of plastic, and the second shield is made of metal, so that the overall weight of the shield assembly can be reduced, and the manufacturing cost can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of power tools, and particularly relates to a cutting device. Background Art

[0002] The cutting device is used for cutting workpieces, such as materials like wood, stone, metal, etc. It generally includes a driving component arranged in a housing, a rotatable saw blade component, a holding part located on the housing, a bottom plate that contacts the workpiece during the cutting operation, and a guard component that shields the saw blade component. The guard component is used to shield the rotating saw blade during the cutting process to avoid harm to the operator. Currently, the guard component of the cutting device mainly uses aluminum alloy, but the aluminum alloy guard has the problems of being relatively heavy in weight and high in cost; in order to reduce the weight of the guard component, there is a solution on the market to use plastic to make the guard. This solution can reduce the weight of the guard component, but the high-temperature chips generated during the operation of the cutting device will melt the plastic guard.

[0003] In view of this, it is necessary to provide an improved cutting device to overcome the defects of the prior art. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a cutting device, and the guard component of this cutting device is light in weight, low in cost and not easily damaged by chips.

[0005] The technical solution adopted by the utility model to solve the problems of the prior art is: a cutting device is equipped with a working head. The cutting device includes a housing, a driving component housed in the housing, and a guard component that at least partially shields the working head. The working head is located at the axial front end of the driving component and is driven by the driving component to rotate. The guard component is connected to the housing; the guard component includes a first guard made of a first material and a second guard made of a second material. The second guard is attached to the end of the first guard and is arranged at the tangential position of the chips generated when the working head cuts the workpiece to be processed. The second guard has a higher melting point than the first guard.

[0006] A further improvement scheme is: the shape of the second guard is adapted to the shape of the end of the first guard, and the first guard has a higher material density than the second guard.

[0007] A further improvement scheme is: the area of the working head shielded by the first guard is larger than the area of the working head shielded by the second guard. The ratio of the area of the working head shielded by the second guard to the area of the working head shielded by the first guard is not greater than 40%; the first material is plastic, and the second material is metal.

[0008] A further improvement solution is as follows: the lower end surface of the second shield is flush with the lower end surface of the first shield, and the height of the second shield is not less than the difference between the radius of the working head and the maximum cutting depth of the cutting device.

[0009] A further improvement solution is as follows: the first shield includes a main body portion connected to the housing and a cover portion covering the working head, and the second shield includes a hook groove formed by bending axially forward, and the hook groove is clamped to the cover portion.

[0010] A further improvement solution is as follows: an opening is provided on the axially rear end wall of the second shield, the rear end wall of the second shield abuts against the main body portion, the side end wall of the second shield abuts against the cover portion, and the second shield is connected to the first shield by screws passing through the opening.

[0011] A further improvement solution is as follows: the drive assembly includes a motor assembly for driving the working head, a fan is installed on the motor assembly, and the fan rotates with the rotation of the motor assembly to generate an air flow; the main body portion includes ventilation holes penetrating the end surface, and the air flow generated by the rotation of the fan flows through the ventilation holes and blows towards the cover portion.

[0012] A further improvement solution is as follows: the ventilation holes are located at the axially rear end of the outer edge of the working head and above the second shield, and the ventilation holes guide the air flow generated by the rotation of the fan to blow towards the chips.

[0013] A further improvement solution is as follows: the drive assembly includes a gearbox assembly located between the working head and the motor assembly, the cutting device includes a gearbox housing for housing the gearbox assembly, and the gearbox housing is connected to the main body portion.

[0014] A further improvement solution is as follows: the main body portion covers the gearbox housing, and the gearbox housing is integrally injection-molded on the main body portion or the gearbox housing is connected to the main body portion by screws.

[0015] Compared with the prior art, the present utility model has the following beneficial effects: the shield assembly includes a first shield made of a first material and a second shield made of a second material, the second shield is attached to the end of the first shield, and is disposed at the tangential position of the chips generated when the working head cuts the workpiece to be processed, and the second shield has a higher melting point than the first shield. With such a setting, attaching the second shield can prevent the high-temperature chips from directly contacting the inner wall of the first shield and damaging the first shield; further, the first shield is made of plastic and the second shield is made of metal, which can reduce the overall weight of the shield assembly and lower the manufacturing cost. [Description of the Drawings]

[0016] The following further describes in detail the specific embodiments of the present utility model in conjunction with the accompanying drawings:

[0017] Figure 1 is a three-dimensional schematic diagram of the cutting device of the present utility model;

[0018] Figure 2 is Figure 1 a three-dimensional schematic diagram of the cutting device shown from another angle;

[0019] Figure 3 is Figure 2 an exploded schematic diagram of the shield assembly and the gearbox housing of the cutting device shown;

[0020] Figure 4 is Figure 3 a combined schematic diagram of the shield assembly and the gearbox housing of the cutting device shown.

[0021] The meanings of the reference numerals in the drawings:

[0022] Cutting device 100, tool body 1

[0023] Housing 10, holding part 11

[0024] Unlock button 111, trigger 112

[0025] Gearbox housing 12, bottom plate 2

[0026] Shield assembly 3, first shield 30

[0027] Main body part 301, cover body part 302

[0028] Ventilation hole 303, second shield 31

[0029] Opening 311, hook groove 312

[0030] Angle adjustment mechanism 4, depth adjustment mechanism 5 [Specific embodiments]

[0031] The terms used in the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. For example, the terms indicating orientation or positional relationship such as "upper", "lower", "front", "rear", etc. are only based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present utility model.

[0032] Please refer to Figures 1 to 4The utility model is shown as a cutting device 100, which can cut a workpiece to be processed (not shown), and the workpiece to be processed refers to any block, plate or tube-shaped cuttable material, such as wood, plastic, glass, metal, etc. The cutting device 100 includes a tool body 1 and a bottom plate 2 for supporting the tool body 1, and the tool body 1 is provided with a circular working head (not shown) that can be disassembled and installed; specifically, the working head is a saw blade; the working head is used to cut the workpiece to be processed.

[0033] The base plate 2 is preferably made of a strong and durable material (such as metal). In the present embodiment, it is made of magnesium alloy. The base plate 2 is roughly a rectangular plate-shaped structure, and the base plate 2 has a flat bottom surface (not shown), which rests against the upper surface of the workpiece to be processed during the cutting operation.

[0034] The cutting device 100 also includes a shield assembly 3 for covering the working head, an angle adjustment mechanism 4 located at the front end of the base plate 2, and a depth adjustment mechanism 5 located at the rear end of the base plate 2; the angle adjustment mechanism 4 and the depth adjustment mechanism 5 are arranged perpendicular to the base plate 2, and the required angle can be adjusted by rotating the angle adjustment mechanism 4 to control the cutting depth, and the depth can be adjusted by turning the depth adjustment mechanism 5 to control the cutting depth, which is practical and convenient; the shield assembly 3 can prevent the operator from accidentally touching the rotating working head during the cutting process and causing injury.

[0035] The tool body 1 includes a shell 10 mounted and fixed on the upper surface of the base plate 2 and a driving assembly (not shown) located in the shell 10. The shell 10 includes a gripping portion 11 for an operator to hold. The gripping portion 11 is constructed into a shape that is easy to hold. The gripping portion 11 includes an unlocking button 111 that at least partially protrudes and a trigger 112 located on the inside. The unlocking button 111 is used to release the locking state of the trigger 112 and start the cutting device 100. The trigger 112 can be pulled by the operator to start the driving assembly and drive the working head to rotate.

[0036] Furthermore, the driving assembly includes a motor assembly (not shown) that drives the working head, the working head is located at the axial front end of the motor assembly, and the motor assembly is equipped with a fan (not shown), which rotates with the rotation of the motor assembly to generate airflow.

[0037] The shield assembly 3 is connected to the housing 10. The shield assembly 3 includes a first shield 30 made of a first material and a second shield 31 made of a second material. The second shield 31 is attached to the end of the first shield 30 and is disposed at a tangential position of the chips generated when the working head cuts the workpiece to be processed. The second shield 31 has a higher material density than the first shield 30. The area of the working head shielded by the first shield 30 is larger than the area of the working head shielded by the second shield 31.

[0038] In this embodiment, the first material is plastic and the second material is metal. Making the first shield 30 of plastic can reduce the weight of the shield assembly 3 and lower the cost. At the same time, attaching the second shield 31 made of metal can prevent the high-temperature chips generated during the cutting operation from directly contacting the first shield 30, so that the first shield 30 will not be melted and damaged by the high-temperature chips.

[0039] Specifically, the ratio of the area of the working head shielded by the second shield 31 to the area of the working head shielded by the first shield 30 is not greater than 40%. The lower end surface of the second shield 31 is flush with the lower end surface of the first shield 30, and the height of the second shield 31 is not less than the difference between the radius of the working head and the maximum cutting depth of the cutting device 100.

[0040] Further, the first shield 30 includes a main body portion 301 connected to the housing 10 and a cover portion 302 that shields the working head. The cover portion 302 is located at the axial front end of the main body portion 301, and the main body portion 301 and the cover portion 302 are integrally injection-molded. The second shield 31 includes a hook groove 312 bent toward the axial front end, and the hook groove 312 is clamped to the cover portion 302 so that the second shield 31 is firmly attached to the first shield 30.

[0041] The second shield 31 includes an opening 311 penetrating the axial rear end wall. The rear end wall of the second shield 31 abuts against the main body portion 301, and the side wall of the second shield 31 abuts against the cover portion 302. A screw is installed in the opening 311 to fix the second shield 31 to the first shield 30.

[0042] The end face of the main body portion 301 is provided with ventilation holes 303, and the air flow generated by the rotation of the fan flows through the ventilation holes 303 and blows towards the cover body portion 302; specifically, the ventilation holes 303 are located at the axial rear end of the outer edge of the working head and at the upper end of the second shield 31. The air flow generated by the rotation of the fan flows through the ventilation holes 303 and blows towards the cover body portion 302, and the air flow blows towards the high-temperature chips generated by the working head cutting the workpiece to be processed, which can cool the high-temperature chips; at the same time, the air flow blowing towards the cover body portion 302 can dissipate heat from it, preventing the high-temperature chips from adhering to the peripheral wall of the cover body portion 302 and melting the plastic cover body.

[0043] Further, the drive assembly further includes a gearbox assembly (not shown) located between the working head and the motor assembly. The gearbox assembly connects the motor assembly and the working head and transmits the power output by the motor assembly to the working head; the tool body 1 includes a gearbox housing 12 that houses the gearbox assembly. The main body portion 301 covers the gearbox housing 12. The gearbox housing 12 is integrally injection-molded into the main body portion 301, or the gearbox housing 12 is fixed to the main body portion 301 by screws, or the gearbox housing 12 is connected to the main body portion 301 by a combination of injection molding and screw fixation.

[0044] In this embodiment, the shield assembly 3 includes the first shield 30 made of a first material and the second shield 31 made of a second material. The second shield 31 is attached to the end of the first shield 30 and is disposed at the tangential position of the chips generated when the working head cuts the workpiece to be processed. The second shield 31 has a higher melting point than the first shield 31. With such a setting, attaching the second shield 31 can prevent the high-temperature chips from directly contacting the inner wall of the first shield 30 and damaging the first shield 30; further, the first shield 30 is made of plastic and the second shield 31 is made of metal, which can reduce the overall weight of the shield assembly 3 and lower the manufacturing cost.

[0045] The present utility model is not limited to the above specific embodiments. It can be easily understood by those of ordinary skill in the art that, without departing from the principle and scope of the present utility model, there are many alternative solutions for the cutting device of the present utility model. The protection scope of the present utility model shall be subject to the content of the claims.

Claims

1. A cutting device, equipped with a working head, comprising a housing, a driving assembly received in the housing, and a shield assembly at least partially covering the working head, wherein the working head is located at the axial front end of the driving assembly and is driven to rotate by the driving assembly, and the shield assembly is connected to the housing; characterized in that: The shield assembly includes a first shield made of a first material and a second shield made of a second material, wherein the second shield is attached to the end of the first shield and is arranged at a tangential position of chips generated when the working head cuts a workpiece to be processed, and the second shield has a higher melting point than the first shield.

2. The cutting device according to claim 1, characterized in that: The shape of the second shield is adapted to the shape of the end of the first shield, and the first shield has a higher material density than the second shield.

3. The cutting device according to claim 2, characterized in that: The area of ​​the working head covered by the first shield is larger than the area of ​​the working head covered by the second shield, and the ratio of the area of ​​the working head covered by the second shield to the area of ​​the working head covered by the first shield is not greater than 40%; the first material is plastic, and the second material is metal.

4. The cutting device according to claim 3, characterized in that: The lower end surface of the second shield is flush with the lower end surface of the first shield, and the height of the second shield is not less than the difference between the radius of the working head and the maximum cutting depth of the cutting device.

5. The cutting device according to claim 1, characterized in that: The first shield includes a main body connected to the shell and a cover body covering the working head, and the second shield includes a hook groove bent toward the axial front end, and the hook groove is clamped in the cover body.

6. The cutting device according to claim 5, characterized in that: The axial rear end wall of the second shield is provided with an opening, the rear end wall of the second shield abuts against the main body, the side end wall of the second shield abuts against the cover body, and the second shield is connected to the first shield by screws passing through the opening.

7. The cutting device according to claim 6, characterized in that: The driving assembly includes a motor assembly that drives the working head, and the motor assembly is equipped with a fan. The fan rotates with the rotation of the motor assembly to generate airflow; the main body includes a ventilation hole that passes through the end surface, and the airflow generated by the rotation of the fan flows through the ventilation hole and blows toward the cover body.

8. The cutting device according to claim 7, characterized in that: The ventilation hole is located at the axial rear end of the outer edge of the working head and at the upper end of the second shield, and the ventilation hole guides the airflow generated by the rotation of the fan to blow toward the chips.

9. The cutting device according to claim 8, characterized in that: The driving assembly comprises a gear box assembly located between the working head and the motor assembly, and the cutting device comprises a gear box housing for accommodating the gear box assembly, wherein the gear box housing is connected to the main body.

10. The cutting device according to claim 9, characterized in that: The main body covers the gear box housing, and the gear box housing is integrally injection-molded with the main body or the gear box housing is connected to the main body by screws.

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