Portable direct-current bench grinder

Abstract

The portable direct-current bench grinder comprises a shell, the lower portion of the shell is of a cuboid structure, the middle of the shell is a rectangular pyramid, the upper portion of the shell is a horizontally-arranged cylinder, a direct-current motor is arranged in the cylinder, the two ends of the direct-current motor extend to be provided with rotating shafts, and grinding wheels are fixedly connected to the rotating shafts; a mounting groove is formed in the bottom of the cuboid structure, a buckling groove is upwards formed in the inner wall of the mounting groove, a battery box is arranged in the mounting groove in a matched mode, the battery box comprises a shell and a lithium battery arranged in the shell, a fastener is arranged at the upper end of the shell, one end of the fastener extends to the end of the shell, and the other end of the fastener extends to the end of the shell. And the fastener is matched with the catching groove. Model selection of the direct current motor is optimized, the whole grinding machine is small and exquisite in structure and convenient to carry, meanwhile, the design that the battery box can be replaced is adopted, and using outdoors and in areas without power supply is facilitated.

Description

Technical Field

[0001] This invention relates to the field of grinding machine technology, and more particularly to a portable DC benchtop grinding machine. Background Technology

[0002] Benchtop grinding machines are commonly used to sharpen various cutting tools and implements. In addition to meeting some common requirements of grinding machine tools, grinding machines are characterized by high speed, simple structure, wide applicability, and generally manual operation.

[0003] With the needs of production and daily life, smaller, low-power benchtop grinders have emerged, greatly improving portability. However, these benchtop grinders require connection to mains power to operate, necessitating the pulling of cables during operation, which is rather cumbersome, especially in scenarios with short working times. Meanwhile, most existing handheld power tools use carbon brush motors, which, while inexpensive, suffer from problems such as high noise levels and the need for regular carbon brush replacement. Summary of the Invention

[0004] To address the aforementioned problems, this invention discloses a portable DC benchtop grinder, comprising a housing. The lower part of the housing is a cuboid structure, the middle part is a frustum pyramid, and the upper part is a horizontally arranged cylinder. A DC motor is housed inside the cylinder, and rotating shafts extend from both ends of the DC motor, with grinding wheels fixedly connected to the rotating shafts. The housing is divided into front and rear sections, which are connected and fixed together by screws. Starting the DC motor drives the grinding wheel to rotate for operation.

[0005] The bottom of the cuboid structure is provided with a mounting groove, and the inner wall of the mounting groove has an upward-facing snap-fit ​​groove. A battery box is fitted into the mounting groove. The battery box includes a shell and a lithium battery inside the shell. A fastener is provided at the upper end of the shell, and one end of the fastener extends to the end of the shell. The fastener and the snap-fit ​​groove are engaged. By pressing the fastener and causing it to sink, the engagement with the snap-fit ​​groove is disengaged, allowing the battery box to be removed. Furthermore, the side walls of both the shell and the mounting groove are provided with mutually supporting protrusions to prevent the battery box from being unsupported in the vertical direction when installed in the mounting groove. In addition, the upper surface of the shell and the mounting groove are provided with contacts to realize the electrical connection between the battery box and the internal circuitry of the shell.

[0006] The battery compartment is further compatible with the types used in handheld power tools on the market, which greatly facilitates battery replacement and makes the use of the grinder more flexible and convenient.

[0007] Preferably, a second protective cover is fitted onto the outer side of the grinding wheel, and the second protective cover is fixedly connected to the outer casing. The second protective cover is provided to improve the safety of the equipment during use.

[0008] Preferably, one end of the second protective cover is provided with a first protective cover. Several screws are inserted through the side wall of the second protective cover and are threadedly connected to the side wall of the first protective cover. A connecting opening is provided in the middle of the first protective cover, and the connecting opening is directly opposite the end of the rotating shaft. The connecting opening is used to insert the flexible shaft, and the ends of the rotating shafts are fixedly connected. Therefore, the first protective cover is mainly used for supporting and fixing the flexible shaft.

[0009] Preferably, a knob is provided on the front side of the truncated pyramid. The knob is used to start and adjust the speed of the DC motor.

[0010] Preferably, rubber feet are fixedly connected to the four bottom corners of the outer casing. The rubber feet serve to provide support and absorb shock.

[0011] The beneficial effects of this invention are as follows:

[0012] 1. Equipped with a battery compartment, it can operate outdoors or in scenarios without external power supply. It is fixed to the bottom of the shell by a snap-fit ​​mechanism, and can be quickly removed for replacement by pressing the buckle. It is convenient to carry and also facilitates power supply operation.

[0013] 2. It is equipped with a DC motor. The DC motor is designed as a brushless type, but a carbon brush type can also be selected to meet the needs of different users. Attached Figure Description

[0014] Figure 1 This is a front perspective view of the present invention;

[0015] Figure 2 This is a three-dimensional view of the back of the present invention;

[0016] Figure 3 This is a schematic diagram of the bottom structure of the present invention;

[0017] Figure 4 This is a perspective view of the battery box of the present invention.

[0018] List of reference numerals in the attached diagram:

[0019] 1. Outer shell; 2. Knob; 3. Connection opening; 4. First protective cover; 5. Grinding wheel; 6. Second protective cover; 7. DC motor; 8. Battery box; 9. Rubber feet; 10. Mounting slot; 11. Clip slot; 12. Fastener. Detailed Implementation

[0020] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. Example 1

[0021] like Figures 1 to 4 As shown, a portable DC benchtop grinder includes a housing 1. The lower part of the housing 1 is a cuboid structure, the middle part is a frustum of a square pyramid, and the upper part is a horizontally arranged cylinder. The housing 1 has a two-part structure with pre-drilled holes for screw connections. A DC motor 7 is installed inside the cylinder. The DC motor 7 has a maximum rated power of 120W. The DC motor 7 is a brushless type, meaning that carbon brushes are not used. This results in low noise during operation and eliminates the hassle of replacing carbon brushes. Consequently, the grinder is not affected by carbon brush wear and contamination. Both ends of the DC motor 7 have extended shafts, and grinding wheels 5 are fixedly connected to the shafts. Starting the DC motor 8 drives the grinding wheels 5 to rotate for grinding and other operations.

[0022] The bottom of the cuboid structure is provided with a mounting groove 10, and the inner wall of the mounting groove 10 is provided with a buckle groove 11. A battery box 8 is installed in the mounting groove 10. The battery box 8 includes a shell and a lithium battery inside the shell. The battery box 8 is used to power the grinding wheel. A fastener 12 is provided at the upper end of the shell, and one end of the fastener 12 extends to the end of the shell. The surface of the extended end of the fastener 12 is provided with anti-slip texture. The fastener 12 and the buckle groove 11 cooperate. When the battery box 8 is removed, the fastener 12 is pressed from the anti-slip texture, so that the fastener 12 and the buckle groove 11 are separated, and the battery box 8 can be easily removed. The battery box 8 is convenient for outdoor operation or operation in areas without power. At the same time, the entire grinding wheel structure is compact, the battery box 8 is quick to replace, and it is easy to carry and use.

[0023] Furthermore, protruding strips are fixedly connected to the side wall of the housing and the side wall of the mounting groove 10. The protruding strips overlap each other to provide vertical support and limit the battery box 8 in the mounting groove 10.

[0024] A second protective cover 6 is fitted onto the outer side of the grinding wheel 5. The second protective cover 6 improves the safety of the grinding machine. The second protective cover 6 is fixedly connected to the outer casing 1. At the same time, the use of the second protective cover 6 will not affect the replacement of the grinding wheel 5.

[0025] One of the second protective covers 6 has a first protective cover 4 at one end. Several screws are inserted through the side wall of the second protective cover 6 and are threaded to the side wall of the first protective cover 4. By rotating and removing the screws, the first protective cover 4 can be pulled axially to remove it. A connecting opening 3 is provided in the middle of the first protective cover 4 and is directly opposite the end of the rotating shaft. The connecting opening 3 is used to connect a flexible shaft. One end of the flexible shaft is fixedly connected to the end of the rotating shaft, and the other end is used with a corresponding tool for production to improve the efficiency of the operation. In addition, a horizontal plate supporting the workpiece grinding is provided on the second protective cover 6 adjacent to the first protective cover 4.

[0026] A knob 2 is located on the front of the truncated pyramid. A frequency converter circuit is installed inside the truncated pyramid, and the knob 2 is used to start and control the frequency converter, thereby realizing the speed change of the DC motor 6.

[0027] Rubber feet 9 are fixedly connected to the four corners of the bottom of the outer casing 1. The rubber feet 9 are used for support and shock absorption. Example 2

[0028] Based on Embodiment 1, but differing from it, the DC motor 7 uses carbon brushes. Consequently, there is no need to install a frequency converter circuit inside the truncated pyramid. Knob 2 controls the current / voltage, thereby changing the speed of the DC motor 7. Compared to Embodiment 1, this embodiment simplifies the circuit structure, thus reducing production costs. Furthermore, the availability of brushless and brushless types of the DC motor 7 can meet the needs of different users.

[0029] The technical means disclosed in this invention are not limited to those disclosed in the above embodiments, but also include technical solutions composed of any combination of the above technical features.

Claims

1. A portable DC benchtop grinder, characterized in that, Includes an outer shell (1), the lower part of which is a cuboid structure, the middle part is a truncated pyramid and the upper part is a horizontally arranged cylinder. A DC motor (7) is installed inside the cylinder. Both ends of the DC motor (7) are provided with rotating shafts, and a grinding wheel (5) is fixedly connected to the rotating shaft. The bottom of the cuboid structure is provided with a mounting groove (10), and the inner wall of the mounting groove (10) is provided with a buckle groove (11) facing upward. A battery box (8) is provided in the mounting groove (10). The battery box (8) includes a shell and a lithium battery is provided inside the shell. A fastener (12) is provided at the upper end of the shell, and one end of the fastener (12) extends to the end of the shell. The fastener (12) and the buckle groove (11) cooperate.

2. The portable DC benchtop grinder according to claim 1, characterized in that: The outer side of the grinding wheel (5) is fitted with a second protective cover (6), which is fixedly connected to the outer shell (1).

3. A portable DC benchtop grinder according to claim 2, characterized in that: One of the second protective covers (6) has a first protective cover (4) at its end. Several screws are inserted through the side wall of the second protective cover (6), and the screws are threadedly connected to the side wall of the first protective cover (4). A connection opening (3) is provided in the middle of the first protective cover (4), and the connection opening (3) is directly opposite the end of the rotating shaft.

4. A portable DC benchtop grinder according to claim 1, characterized in that: A knob (2) is provided on the front of the truncated pyramid.

5. A portable DC benchtop grinder according to claim 1, characterized in that: Rubber feet (9) are fixedly connected to the four bottom corners of the outer shell (1).

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