Cutting device

Abstract

A cutting device includes a housing, a driving assembly accommodated in the housing, an output shaft connected to the axial front end of the driving assembly, a bearing seat sleeved on the output shaft, and a dynamic shield rotatably mounted on the bearing seat, wherein the driving assembly includes a motor assembly rotatably connected to the output shaft, the motor assembly rotates to drive the output shaft to rotate, the motor assembly is installed with a fan, the fan rotates with the rotation of the motor assembly to generate airflow, the bearing seat includes a base and a sleeve portion extending axially from the base, the dynamic shield is sleeved on the sleeve portion and rotates around the sleeve portion; the bearing seat includes a gap that penetrates the base axially, the gap is located on the outer periphery of the base, and the airflow generated by the rotation of the fan flows through the gap and blows toward the dynamic shield. The airflow can blow out the debris and dust between the bearing seat and the dynamic shield through the gap, so that the dynamic shield rotates smoothly; at the same time, the debris and dust can be removed without disassembling the dynamic shield, and maintenance is simple and convenient.

Description

[Technical field]

[0001] The utility model relates to the technical field of electric tools, in particular to a cutting device. [Background Technology]

[0002] The cutting device is used to cut workpieces, such as wood, stone, metal and other materials. It usually includes a driving assembly arranged in a shell, a rotatable saw blade assembly, a grip located on the shell, a base plate that contacts the workpiece during the cutting operation, and a guard assembly that covers the saw blade assembly. The guard assembly includes a fixed guard fixed to the shell and a dynamic guard that can rotate during the cutting process; the dynamic guard can roughly surround the lower half of the saw blade to prevent the operator from accidentally contacting the saw blade.

[0003] The existing dynamic guard is pivotally mounted on the bearing cover of the cutting device through a set of parts. When the dynamic guard moves from the closed position to the open position, the set of parts pivots around the bearing cover. The set of parts and the bearing cover are not tightly matched, but have an appropriate gap. Since the saw blade generates a lot of debris and dust during the cutting process, the debris and dust will fall into the gap between the set of parts of the dynamic guard and the bearing cover, resulting in increased friction between the two. When too much accumulation occurs, the dynamic guard will be stuck and unable to rebound to the closed position in time.

[0004] In view of this, it is indeed necessary to provide an improved cutting device to overcome the defects of the prior art. [Contents of the utility model]

[0005] In view of the deficiencies of the prior art, the utility model aims to provide a cutting device with a dynamic shield that rotates smoothly.

[0006] The utility model adopts the following technical solution to solve the problems of the prior art: a cutting device, comprising a shell, a driving component accommodated in the shell, an output shaft connected to the axial front end of the driving component, a bearing seat sleeved on the output shaft and a dynamic shield rotatably mounted on the bearing seat, the driving component comprising a motor component rotatably connected to the output shaft, the motor component rotates to drive the output shaft to rotate, the motor component is equipped with a fan, the fan rotates with the rotation of the motor component to generate airflow, the bearing seat comprises a base and a sleeve portion extending axially from the base, the dynamic shield is sleeved on the sleeve portion and rotates around the sleeve portion; the bearing seat comprises a gap axially penetrating the base, the gap is located on the outer periphery of the base, the airflow generated by the rotation of the fan flows through the gap and blows toward the dynamic shield.

[0007] A further improved solution is: the dynamic shield includes a mounting portion sleeved on the sleeve portion, the outer diameter of the sleeve portion is not greater than the inner diameter of the mounting portion, and the mounting portion pivots around the axis of the sleeve portion to rotate the dynamic shield.

[0008] A further improved solution is: a rotating part is formed between the mounting part and the sleeve part, the rotating part is located at the axial front end of the gap, and the airflow blows toward the rotating part through the gap.

[0009] A further improved solution is: the bearing seat includes a lug located on the outer periphery of the base, and the gap is located between the base and the lug.

[0010] A further improved solution is: the bearing seat includes a connecting portion connecting the sleeve portion and the lug, and the gap is located between two adjacent connecting portions.

[0011] A further improved solution is: the cutting device comprises a fixed shield fixed to the housing, and the fixed shield is connected to the bearing seat through the lug.

[0012] A further improvement is as follows: after the airflow passes through the rotating part, it blows radially outward in a circular shape toward the inner periphery of the fixed shield and the dynamic shield.

[0013] A further improvement is that the axial length of the sleeve portion is greater than the axial length of the mounting portion, a groove is provided on the outer periphery of the sleeve portion, and after the mounting portion is sleeved on the sleeve portion, the groove is located at the axial front end of the mounting portion.

[0014] A further improved solution is: the bearing seat includes a retaining spring installed in the groove, and the retaining spring fixes the dynamic shield to the bearing seat.

[0015] A further improvement is that the sleeve portion and the lug are integrally formed, the gaps are evenly distributed on the periphery of the base in the circumferential direction, and the number of the gaps is 4.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the bearing seat includes a gap which penetrates the base along the axial direction, the gap is located at the outer periphery of the sleeve part, and the airflow generated by the rotation of the fan flows through the gap and blows toward the dynamic shield; the airflow through the gap can blow out the debris and dust between the bearing seat and the dynamic shield, so that the dynamic shield rotates smoothly; at the same time, the debris and dust can be removed without disassembling the dynamic shield, and maintenance is simple and convenient. [Drawings]

[0017] The specific implementation of the utility model is further described in detail below in conjunction with the accompanying drawings:

[0018] Figure 1It is a three-dimensional schematic diagram of the cutting device of the utility model;

[0019] Figure 2 yes Figure 1 A cross-sectional view of the structure of the dynamic shield of the cutting device shown;

[0020] Figure 3 yes Figure 2 An exploded view of the structure of the dynamic shield of the cutting device shown;

[0021] Figure 4 yes Figure 3 The three-dimensional schematic diagram of the cooperation between the dynamic shield and the bearing seat of the cutting device is shown.

[0022] Meaning of the reference numerals in the figures:

[0023] Cutting device 100 Tool body 1

[0024] Housing 10 Grip 11

[0025] Foot plate 111 Trigger 112

[0026] Unlock button 113 Output shaft 12

[0027] Bottom plate 2 Angle adjustment mechanism 20

[0028] Depth adjustment mechanism 21 Battery pack 3

[0029] Cutting disc 4 Fixed guard 5

[0030] Dynamic guard 6 mounting portion 60

[0031] Cover body 61 Rotating portion 62

[0032] Bearing seat 7 Set part 70

[0033] Lug 71 Gap 72

[0034] Connecting portion 73 Groove 74

[0035] Circlip 75 Base 76

[0036] Pressure plate assembly 8 Inner pressure plate 80

[0037] External pressure plate 81 screw 82 [Specific implementation method]

[0038] The terms used in the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. For example, the words "upper", "lower", "front", "back", etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0039] See also Figures 1 to 4 The utility model is shown as a cutting device 100, which can cut a workpiece to be processed (not shown). The workpiece to be processed refers to any block-shaped, plate-shaped or hole-shaped cuttable material, such as wood, plastic, glass, metal, etc. The cutting device 100 includes a tool body 1 and a base plate 2 for supporting the tool body 1. The tool body 1 is provided with a circular cutting blade 4 that can be disassembled and installed, and the cutting blade 4 is used to cut the workpiece to be processed. The base plate 2 is preferably made of a strong and durable material (such as metal). In this 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 abuts against the upper surface of the workpiece to be processed during the cutting operation.

[0040] The base plate 2 includes an angle adjustment mechanism 20 located at its front end and a depth adjustment mechanism 21 located at its rear end. The angle adjustment mechanism 20 and the depth adjustment mechanism 21 are arranged perpendicular to the base plate 2. The desired angle can be adjusted by rotating the angle adjustment mechanism 20 to control the cutting angle, and the desired depth can be adjusted by turning the depth adjustment mechanism 21 to control the cutting depth. It is practical and convenient.

[0041] The tool body 1 includes a shell 10 installed and fixed on the upper surface of the base plate 2, a gripping portion 11 connected to the shell 10, a driving assembly (not shown) accommodated in the shell 10, an output shaft 12 connected to the axial front end of the driving assembly, a bearing seat 7 sleeved on the output shaft 12, a fixed protective cover 5 fixed to the shell 10 and a dynamic protective cover 6 rotatably installed on the bearing seat 7; the fixed protective cover 5 is connected to the bearing seat 7, the fixed protective cover 5 covers the upper half of the circumference of the cutting blade 4, the dynamic protective cover 6 covers the lower half of the circumference of the cutting blade 4, and the dynamic protective cover 6 is further opened as the cutting operation proceeds.

[0042] The gripping portion 11 is configured to be easy for an operator to grasp, one end of the gripping portion 11 is connected to the housing 10, and the other end extends backward to form a foot plate portion 111 at the end, and a battery pack 3 is slidably mounted on the foot plate portion 111, and the battery pack 3 is used to provide power to the cutting device 100 to drive the driving assembly to operate.

[0043] Furthermore, a trigger 112 and an unlocking button 113 connected to the trigger 112 are provided on the inner side of the gripping portion 11, wherein the trigger 112 is provided for the operator to control the start and stop of the cutting device 100, and the unlocking button 113 is used to prevent the operator from accidentally starting the cutting device during non-cutting operations; when the operator presses the unlocking button 113, the trigger 112 can be pressed, and at this time the operator pulls the trigger 112 by hand, and the driving assembly starts to rotate the cutting blade 4.

[0044] The driving assembly includes a motor assembly (not shown) rotatably connected to the output shaft 12, and the motor assembly is equipped with a fan (not shown). The fan rotates with the rotation of the motor assembly to generate airflow, and the airflow enters from the rear end of the housing 10 and blows toward the cutting blade 4.

[0045] See also Figures 2 to 4 As shown, the bearing seat 7 includes a base 76, a sleeve portion 70 extending axially from the base 76, a gap 72 axially extending through the base 76, and a lug 71 located on the outer periphery of the base 76, the dynamic shield 6 is sleeved on the sleeve portion 70 and rotates around the sleeve portion 70, the gap 72 is located on the outer periphery of the base 76 and on the inner periphery of the lug 71, and the fixed shield 5 is connected to the bearing seat 7 via the lug 71.

[0046] The dynamic guard 6 includes a mounting portion 60 that is sleeved on the sleeve portion 70 and a cover body portion 61 that covers the cutting blade 4. The outer diameter of the sleeve portion 70 is not greater than the inner diameter of the mounting portion 60. The mounting portion 60 pivots around the axis of the sleeve portion 70 to rotate the dynamic guard 6. The cover body portion 61 is integrally formed with the sleeve portion 60.

[0047] Furthermore, a rotating portion 62 is formed between the mounting portion 60 and the sleeve portion 70, and the rotating portion 62 is located at the axial front end of the gap 72; after the airflow enters from the rear end of the casing 10, it flows toward the axial front end, and when it flows to the bearing seat 7, it blows toward the rotating portion 62 from the gap 72.

[0048] The cutting device 100 will generate debris and dust during the cutting process, and the debris and dust will enter the rotating part 62 as the dynamic protective cover 6 opens and closes. When the debris and dust accumulate too much, the dynamic protective cover 6 will become stuck and unable to rebound in time. In this embodiment, the airflow blows toward the rotating part 62 through the gap 72 to blow the debris and dust out of the rotating part 62. Specifically, the airflow blows the debris and dust in the rotating part 62 toward the inner periphery of the fixed protective cover 5 and the cover body 61 and throws it out of the cutting device 100. This arrangement allows the dynamic protective cover 6 to rotate smoothly, and debris and dust can be removed without disassembly. The structure is simple and dust removal and chip removal are convenient.

[0049] The bearing seat 7 includes a connecting portion 73 connecting the sleeve portion 70 and the lug 71, the gaps 72 are respectively located between two adjacent connecting portions 73, the sleeve portion 70 and the lug 71 are integrally formed, and the gaps 72 are uniformly distributed on the outer periphery of the base 76 in the circumferential direction. In this embodiment, the number of the gaps 72 and the connecting portions 73 is 4, and it can be imagined that the number of the gaps 72 can also be selected as 1, 2, 3, 5, 6, etc.

[0050] Furthermore, the axial length of the sleeve portion 70 is greater than the axial length of the mounting portion 60, and a groove 74 is provided on the outer periphery of the sleeve portion 70. After the mounting portion 60 is sleeved on the sleeve portion 70, the groove 74 is located at the axial front end of the mounting portion 60, and a retaining spring 75 is installed in the groove 74 to fix the dynamic shield 6 to the bearing seat 7.

[0051] A pressure plate assembly 8 is installed at the front and rear ends of the cutting blade 4, and the pressure plate assembly 8 fixes the cutting blade 4 to the output shaft 12; the pressure plate assembly 8 includes an inner pressure plate 80 located at the axial rear end of the cutting blade 4 and an outer pressure plate 81 located at the axial front end of the cutting blade 4, and the outer pressure plate 81 is provided with a threaded hole. The pressure plate assembly 8 also includes a screw 82 threadedly engaged with the outer pressure plate 81, and the screw 82 is screwed into the threaded hole to fix the outer pressure plate 81 to the axial front end of the output shaft 12.

[0052] In this embodiment, the bearing seat 7 includes the gap 72 that penetrates the base 76 axially, and the gap 72 is located at the outer periphery of the sleeve portion 70. The airflow generated by the rotation of the fan flows through the gap 72 and blows toward the dynamic shield 6. The airflow can blow out debris and dust between the bearing seat 7 and the dynamic shield 6 through the gap 72, so that the dynamic shield 6 rotates smoothly. At the same time, the debris and dust can be removed without disassembling the dynamic shield 6, and maintenance is simple and convenient.

[0053] The present invention is not limited to the above specific embodiments. A person skilled in the art can easily understand that there are many alternatives to the cutting device of the present invention without departing from the principle and scope of the present invention. The protection scope of the present invention shall be subject to the content of the claims.

Claims

1. A cutting device, comprising a housing, a driving assembly accommodated in the housing, an output shaft connected to the axial front end of the driving assembly, a bearing seat sleeved on the output shaft, and a dynamic shield rotatably mounted on the bearing seat, wherein the driving assembly comprises a motor assembly rotatably connected to the output shaft, the motor assembly rotates to drive the output shaft to rotate, the motor assembly is equipped with a fan, the fan rotates with the rotation of the motor assembly to generate airflow, the bearing seat comprises a base and a sleeve portion extending axially from the base, the dynamic shield is sleeved on the sleeve portion and rotates around the sleeve portion; characterized in that: The bearing seat includes a gap that penetrates the base along the axial direction, and the gap is located at the outer periphery of the base. The airflow generated by the rotation of the fan flows through the gap and blows toward the dynamic shield.

2. The cutting device according to claim 1, characterized in that: The dynamic shield comprises a mounting portion sleeved on the sleeve portion, the outer diameter of the sleeve portion is not greater than the inner diameter of the mounting portion, and the mounting portion pivots around the axis of the sleeve portion to rotate the dynamic shield.

3. The cutting device according to claim 2, characterized in that: A rotating portion is formed between the mounting portion and the sleeve portion. The rotating portion is located at the axial front end of the gap, and the airflow passes through the gap and blows toward the rotating portion.

4. The cutting device according to claim 3, characterized in that: The bearing seat includes a lug located at the outer periphery of the base, and the gap is located between the base and the lug.

5. The cutting device according to claim 4, characterized in that: The bearing seat comprises a connecting portion connecting the sleeve portion and the lug, and the gap is respectively located between two adjacent connecting portions.

6. The cutting device according to claim 5, characterized in that: The cutting device comprises a fixed shield fixed to the housing, and the fixed shield is connected to the bearing seat through the lug.

7. The cutting device according to claim 6, characterized in that: After the airflow passes through the rotating part, it blows radially outward in a circular shape toward the inner peripheries of the fixed shield and the dynamic shield.

8. The cutting device according to claim 2, characterized in that: The axial length of the sleeve portion is greater than the axial length of the mounting portion. A groove is provided on the outer periphery of the sleeve portion. After the mounting portion is sleeved on the sleeve portion, the groove is located at the axial front end of the mounting portion.

9. The cutting device according to claim 8, characterized in that: The bearing seat includes a retaining spring mounted to the groove, and the retaining spring fixes the dynamic shield to the bearing seat.

10. The cutting device according to claim 4, characterized in that: The sleeve portion and the lug are integrally formed, the gaps are evenly distributed on the outer periphery of the base in the circumferential direction, and the number of the gaps is 4.

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