A hand-held sander

Abstract

The application discloses a handheld sander, which comprises a main shell, a holding part on one side of the main shell, a working head on the side opposite to the holding part of the main shell, the working head being used for polishing objects, a mounting seat arranged in the circumference of the main shell, the mounting seat being used for connecting a battery pack, the mounting seat comprising a clamping part, the bottom side of the clamping part being provided with a terminal, the terminal being used for electrically connecting with a terminal of the battery pack, the inner wall of the clamping part being provided with a protruding part, the protruding part being used for abutting against the embedded battery pack, a counterweight part and a driving part being arranged in the main shell, the counterweight part being located on the side opposite to the mounting seat in the main shell and being close to the holding part side, the driving part being provided with a driving shaft on the side away from the counterweight part, and the driving shaft being used for connecting a fan assembly. By arranging the counterweight part in the main shell, the balance of the sander when the sander is installed with a large-capacity battery pack is improved.

Description

Technical Field

[0001] This application relates to the field of power tools, and more specifically to a handheld sander. Background Technology

[0002] Handheld sanders are widely used power tools for sanding wood and metal surfaces. They can be operated with one hand, are compact and portable, and easy to use. Handheld sanders are divided into square sanders and round sanders based on the shape of the sandpaper and the sanding method. Both types of sanders use a motor to drive an eccentric wheel to vibrate and achieve sanding. Round sanders, however, have a rotating chassis in addition to the vibrating eccentric wheel, making them more efficient. Both square and round sanders use a dust collection hole at the bottom to suck up sanding dust through a rotating impeller. Most existing round sanders use a limited power supply (i.e., powered by an external power cord), which can cause interference and inconvenience. Some round sanders are battery-powered, with the battery pack located on one side. This imbalance can lead to the sander tipping over when stationary (especially noticeable with large-capacity battery packs like 4Ah), and the imbalance also reduces the user experience during operation. Utility Model Content

[0003] To overcome the above-mentioned shortcomings, the purpose of this application is to provide a handheld sander with good balance and improved user experience.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] A handheld sander, comprising:

[0006] The main housing has a grip on one side and a working head on the side opposite to the grip, the working head being used for grinding objects;

[0007] A mounting base is provided circumferentially on the main housing for connecting a battery pack. The mounting base includes a clamping part with a terminal on its bottom side for electrical connection with the terminals of the battery pack. The inner wall of the clamping part has a protrusion for abutting the embedded battery pack.

[0008] The main housing contains a counterweight and a drive component. The counterweight is located on the side of the main housing opposite to the mounting base and close to the grip. A drive shaft is located on the side of the drive component away from the counterweight, and this drive shaft is used to connect to the fan assembly. This improves balance when carrying a large-capacity battery pack, such as a 4Ah battery.

[0009] Preferably, the counterweight is mounted on the edge region of one end of the drive component.

[0010] Preferably, the bottom side of the clamping part has a terminal extending axially along the main housing;

[0011] The clamping part is U-shaped, and the protrusions on its inner wall are elastic.

[0012] Preferably, the protrusion is a rubber pad.

[0013] Preferably, the mounting base has a latch located on the top side of the mounting base and disposed opposite to the terminal for locking the battery pack.

[0014] Preferably, the drive shaft of the drive component is connected to the output shaft, and the output shaft is connected to the fan assembly and the working head.

[0015] Preferably, the fan assembly includes a base, the middle of which has a mounting portion, the mounting portion having a slot extending axially therefrom, and the output shaft passing through the slot and connected to the output shaft.

[0016] Preferably, the fan assembly includes a base having a first side, the first side having a first blade extending axially along the base, and the first side having a first counterweight module.

[0017] The base has a second side opposite to the first side, the second side has a second blade extending axially along the base, and the second side has a second counterweight module.

[0018] Preferably, the first counterweight module and the second counterweight module are fan-shaped or semi-circular.

[0019] Preferably, the main housing is further provided with a connecting part in the circumferential direction, and the connecting part is connected to the dust collection component.

[0020] Beneficial effects

[0021] This application improves the balance of the sander by optimizing the structure of the fan assembly and adding a counterweight module to the fan assembly. In addition, the structure of the interface of the sander for connecting with the battery pack is optimized to achieve reliable connection of the battery pack (such as large capacity) and reduce the problem of abnormal contact between the battery pack and the electrode plates caused by vibration during operation. Attached Figure Description

[0022] The accompanying drawings are provided to illustrate the technical solutions of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the technical solutions of this disclosure and do not constitute a limitation on the technical solutions of this disclosure. The shapes and sizes of the components in the drawings do not reflect actual proportions and are only intended to illustrate the content of this application.

[0023] Figure 1 This is a schematic diagram of the structure of a sander provided in an embodiment of this application;

[0024] Figure 2 for Figure 1 A schematic diagram of a sander with the battery pack and dust collection box concealed in the center;

[0025] Figure 3 for Figure 2 A schematic diagram from one perspective;

[0026] Figure 4 for Figure 3 Schematic diagram of the cross section at point AA;

[0027] Figure 5 for Figure 1 A schematic diagram of a sander with the main housing obscured.

[0028] Figure 6 This is a schematic diagram of the internal structure of the illustration provided for the embodiments of this application;

[0029] Figure 7 for Figure 6 A structural diagram from another perspective;

[0030] Figure 8 for Figure 7 A schematic diagram of the working head is hidden in the middle;

[0031] Figure 9 This is a schematic diagram of the internal structure of a sander provided in an embodiment of this application from another perspective;

[0032] Figure 10 This is a schematic diagram showing the connection between the drive component and the bearing assembly provided in an embodiment of this application;

[0033] Figure 11 This is a schematic diagram of the structure of the fan assembly provided in an embodiment of this application. Detailed Implementation

[0034] The above-described solution will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application. The implementation conditions used in the embodiments may be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are generally those in routine experiments.

[0035] In this application, the terms "upper," "lower," "inner," "middle," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0036] The above-described solution will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application. The implementation conditions used in the embodiments may be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are generally those in routine experiments.

[0037] This application proposes a handheld sander. By optimizing the structure of the fan assembly and adding a counterweight module, the static balance and dynamic balance during operation of the sander are improved, allowing the sander to be equipped with a large-capacity battery pack. Preferably, the fan assembly in this application is injection molded from plastic, which reduces costs compared to the current practice of mostly using metal. Adding a counterweight to the plastic fan assembly improves the balance of the sander. In addition, by optimizing the interface, which faces upwards, and further adding a buffer part (such as a rubber pad) on the side wall of the interface, the problem of abnormal contact between the battery pack and the electrode plates caused by vibration during operation is reduced.

[0038] Next, let's combine Figures 1-11 This application describes the handheld sander provided in the embodiments of this application.

[0039] The handheld sander 100 includes a main housing 120, a grip 110 on one side of the main housing 120, and a working head 150 on the side of the main housing 120 opposite to the grip 110. The working head 150 is used for sanding objects. A mounting base 130 and a connecting part 121 are provided circumferentially on the main housing 120. The mounting base 130 is used to connect a battery pack 140, which can be a lithium-based rechargeable battery with a capacity of 2Ah, 4Ah, etc. The maximum voltage (MAX) of the battery pack 140 can be 20V or 40V. The connecting part 121 connects to a dust collection component 160. The connecting portion 121 has a connecting end 121a, and the connecting end 121a and the protrusion 121b located on the side of the connecting end 121a. When connecting, the connecting end 121a is inserted into the dust collection component 160, and the protrusion 121b matches the recess on the dust collection component 160 to help fix the dust collection component 160.

[0040] The mounting base 130 includes a clamping portion 132, which is U-shaped and has a terminal 131 (also called an electrode plate) on its bottom side. The terminal 131 is used for mating connection (electrical connection) with the terminals of the battery pack 140. In this embodiment, the terminal 131 is fixed to a base 132a on the bottom side of the clamping portion 132 and extends towards the gripping portion 110. The inner wall of the clamping portion 132 has a protrusion 132b, which abuts against the embedded battery pack 140. This allows the protrusion 132b to clamp the battery pack after it is placed in the mounting base 130, preventing movement of the battery pack 140 due to vibration during polishing. In one embodiment, the protrusion 132b is elastic, such as a rubber pad, to absorb the energy of vibration during polishing and to provide anti-slip properties, limiting battery pack movement. In one embodiment, the mounting base 130 has a latch 133, preferably located on the top side of the mounting base 130 and disposed opposite to the terminal 131, for locking the battery pack 140 after it is placed in the mounting base 130.

[0041] A counterweight 114 and a drive component are provided inside the main housing. The counterweight 114 is positioned opposite the mounting base 130, so that when a large-capacity battery pack (e.g., 4Ah) is installed on the mounting base 130, the counterweight 114 improves the balance. Preferably, the counterweight 114 is located close to the grip side, with one end abutting against the base inside the main housing 120 and the other end abutting against the inner wall of the grip 110, thus providing support strength for the grip 110. A switch button 112 and an adjustment switch 111 are provided on the side of the counterweight 114, and the switch button 112 and the adjustment switch 111 are respectively connected to the control board 115 inside the main housing 120 via leads. Preferably, the counterweight 114 is T-shaped. By setting the counterweight 114, the handheld sander 100 connected to the large-capacity battery pack (e.g., a 4Ah battery pack) can maintain balance. Preferably, a through hole can be made in the counterweight part 114, and the switch button 112 and the debugging switch 111 can be connected to the control board 115 inside the main housing 120 through the through hole by lead wires.

[0042] The main housing 120 has a receiving cavity 120b, in which a drive component 170 is installed. The drive component 170 has a drive shaft 171, which is connected to an output shaft 172. A fixed end 174 is provided on the side of the output shaft 172 away from the drive shaft 171. The fixed end 174 is used to fix the working head 150. For example, the working head 150 has a through hole 152, through which a connecting piece 153 (such as a bolt) passes and is fixed to the fixed end 174. The working head 150 has a through hole 151, which serves as a suction hole to remove grinding particles generated during operation and collect them into a dust collection component 160. An eccentric assembly or bearing sleeve 173 is provided on the fixed end 174. The counterweight 114 is mounted on the edge region (non-center position) of one end of the drive component 170, away from the mounting base 130, so that even when a large 4Ah battery pack is installed, the counterweight 114 can improve the balance of the sander. A drive shaft is provided on the side of the drive component away from the counterweight, which is used to connect the fan assembly.

[0043] The main housing 120 is columnar, with a fan assembly inside one side, and an air duct on the inner wall of the main housing near the fan assembly, which connects to a fixed dust collection component.

[0044] A fan assembly 180 is disposed within the main housing 120. The fan assembly 180 is sleeved on the output shaft 172 and rotates based on the rotation of the output shaft 172. The fan assembly 180 includes a base 181, the middle of which has a mounting portion 181a. The mounting portion 181a has a slot 181a1, which connects to the output shaft 172 (or connects the output shaft 172 and the drive shaft 171). The output shaft 172 passes through the slot 181a1. A first side 181b of the base 181 has a first blade 183 extending axially along the base 181. The first blade 183 is distributed circumferentially along the first side 181b, and the first side 181b has a first counterweight module 184. The first blade 183 is located near the grip portion 110. The base 181 has a second blade 182 extending axially along the base 181 on a second side 181c away from the first blade 183. The second blade 182 is distributed circumferentially along the second side 181c, and the second side 181c has a second counterweight module 185. In one embodiment, the first counterweight module 184 and the second counterweight module 185 are symmetrically arranged along the mounting portion 181a (located on both sides of the base 181). The second blade 182 is close to the working head side. In this embodiment, the fan assembly 180 may be made of plastic, such as injection molded plastic, and then the counterweight module is mounted on it. The first / second counterweight module is fan-shaped or semi-circular. When rotating, its cooperation with the working head generates an eccentric oscillation on the working surface of the working head, thereby effectively treating the surface of the workpiece. By setting the counterweight module, the balance of the sander is improved.

[0045] For example, in this embodiment, the base, first blade, and second blade of the fan assembly are all made of plastic, which can further reduce the manufacturing cost of the fan assembly (compared to traditional aluminum alloy materials). Furthermore, the fan assembly is a one-piece molded structure, that is, the base, first blade, and second blade are molded as a single piece. In this embodiment, the first blade and second blade are integrated together to form a double-sided fan, which helps to shorten the height of the machine in the vertical direction, making the overall structure more compact and reducing the weight of the sander.

[0046] The main housing 120 has a main body portion 120a. One side of the main body portion 120a has a connecting slot 122, which connects to a first guide portion 123. The first guide portion 123a has a groove that connects to a cover plate 124, which engages with one side of the working head 150. The combination of the first guide portion 123 and the cover plate 124 guides the airflow generated by the rotation of the fan assembly 180. The cover plate 124 seals the working head 150. A through hole 151, serving as an air intake on the working head 150, is located within the contour of the cover plate 124. Thus, dust particles generated during grinding pass through the through hole 151, the cover plate 124, and the first guide portion 123, and are transported via an air duct 122c to the dust collection component 160. Specifically, one side of the main body portion 120a has an air duct 122c, which connects to the dust collection component 160.

[0047] The drive component 170 includes a motor that transmits power to the fan assembly 180 and an output shaft 172. When the motor rotates, the motor shaft transmits power to the fan assembly, thereby driving the fan assembly to rotate. Furthermore, the fan assembly 180 integrates heat dissipation and dust collection. The rotation of the fan assembly generates dust-collecting airflow and / or heat dissipation airflow. The heat dissipation airflow cools the drive component inside the housing, while the dust-collecting airflow absorbs particles or dust generated by the base plate assembly. Furthermore, the blades of both the cooling fan (first blade) and the dust-collecting fan (second blade) are curved arcs.

[0048] The above embodiments are only for illustrating the technical concept and features of this application, and are intended to enable those skilled in the art to understand the content of this application and implement it accordingly. They should not be used to limit the scope of protection of this application. All equivalent changes or modifications made in accordance with the spirit and essence of this application should be included within the scope of protection of this application.

Claims

1. A handheld sander, characterized in that, include: The main housing has a grip on one side and a working head on the side opposite to the grip, the working head being used for grinding objects; A mounting base is provided circumferentially on the main housing for connecting a battery pack. The mounting base includes a clamping part with a terminal on its bottom side for electrical connection with the terminals of the battery pack. The inner wall of the clamping part has a protrusion for abutting the embedded battery pack. The main housing is provided with a counterweight and a drive component. The counterweight is located on the side of the main housing opposite to the mounting base and close to the grip. The drive component is provided with a drive shaft on the side away from the counterweight, and the drive shaft is used to connect to the fan assembly.

2. The handheld sander as described in claim 1, characterized in that, The counterweight is installed on the edge region of one end of the drive component.

3. The handheld sander as described in claim 1, characterized in that, The bottom side of the clamping part has a terminal that extends axially along the main housing; The clamping part is U-shaped, and the protrusions on its inner wall are elastic.

4. The handheld sander as described in claim 3, characterized in that, The protrusion is a rubber pad.

5. The handheld sander as described in any one of claims 1-4, characterized in that, The mounting base has a latch located on the top side of the mounting base and positioned opposite the terminal for locking the battery pack.

6. The handheld sander as described in claim 1, characterized in that, The drive shaft of the drive component is connected to the output shaft, and the output shaft is connected to the fan assembly made of plastic and the working head.

7. The handheld sander as described in claim 6, characterized in that, The fan assembly includes a base, the middle of which has a mounting portion, the mounting portion having a slot extending axially therefrom, and the output shaft passing through the slot and connected thereto.

8. The handheld sander as described in claim 6, characterized in that, The fan assembly includes a base having a first side, the first side having a first blade extending axially along the base, and the first side having a first counterweight module. The base has a second side opposite to the first side, the second side has a second blade extending axially along the base, and the second side has a second counterweight module.

9. The handheld sander as described in claim 8, characterized in that, The first and second counterweight modules are fan-shaped or semi-circular.

10. The handheld sander as described in claim 1, characterized in that, The main housing is also provided with a connecting part in the circumferential direction, and the connecting part is connected to the dust collection component.

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