A charging device for an electric dust-removing blackboard eraser

Abstract

The utility model belongs to electrical and mechanical technical field discloses a charging device of electric dust-removing blackboard eraser. The charging device includes charging seat and charging seat cover, and one end of charging seat cover and one end of charging seat are hinged together. The inside of charging seat is equipped with power conversion module, charging battery module and main control circuit board, and three are connected through electric wire and become charging control circuit. The top surface of charging seat is equipped with blackboard eraser groove, and the inside of blackboard eraser groove is equipped with charging groove and first positioning magnet. The main control circuit board is equipped with pilot lamp, can indicate different operating conditions. The utility model adopts magnetic suction pressurization and contact charging mode, and the charging process is stable and reliable; adopts double power supply scheme of external power supply and built-in charging battery, can satisfy the charging demand when external power supply is cut off; adopts the charging mode of putting and charging, improves the convenience of user operation; simple structure, the intuitive pilot lamp shows, and grasps the device charging and storage state in time.

Description

Technical Field

[0001] This utility model belongs to the field of electrical and mechanical technology, and relates to a charging device, specifically a charging device suitable for electric dust removal blackboard erasers. Background Technology

[0002] Although schools in China are currently promoting digital classroom teaching models and continuously developing and popularizing multimedia teaching technologies, the traditional blackboard teaching model remains the mainstream classroom teaching method. In classroom teaching, most lessons still rely on blackboard writing for explanation. When it is necessary to modify or erase the blackboard writing, teachers usually use a traditional blackboard eraser on a frosted glass blackboard. During this process, chalk dust is dispersed into the surrounding air, causing dust pollution, which can affect the health of teachers and students present, and may even induce respiratory diseases.

[0003] To address the aforementioned issues, engineers in the field have designed and developed several electric dust-removing blackboard eraser devices. These devices operate primarily by using a motor to drive the erasing components to rub against the blackboard, followed by a dust collection device to remove and collect the chalk dust generated during friction. All of these electric dust-removing blackboard eraser devices require electrical power. The charging technologies for these devices mainly fall into three categories: the first is charging the device with an external charger, such as the inductive charging dock proposed in Chinese invention patent application CN113619315A; the second is by installing a charging interface on the device, such as the power interface for charging on the side of the device proposed in Chinese patent ZL201922476839.3; and the third is by incorporating a removable rechargeable battery within the device, such as the removable lithium battery proposed in Chinese patent ZL201922361905.2.

[0004] All three technical solutions described above can solve the power supply problem of the electric dust-removing blackboard eraser device, but each has some shortcomings. In the first solution, the charging box relies on a power cord to charge the device in real time; if the power is interrupted, it cannot charge. In the second solution, the charging port on the side of the device is easily affected by chalk dust, causing circuit failure and reducing the device's reliability. In the third solution, the detachable structure increases the user's operational complexity and reduces the device's ease of use. Utility Model Content

[0005] In order to solve the technical problems existing in the prior art, this utility model proposes an electric dust removal blackboard eraser charging device that is stable, reliable, simple in structure, and convenient to operate.

[0006] The technical solution of this utility model specifically includes the following contents:

[0007] A charging device for an electric dust-removing blackboard eraser includes a charging base and a charging base cover, with one end of the charging base cover hinged to one end of the charging base. The charging base houses a power conversion module, a rechargeable battery module, and a main control circuit board, which are connected by wires to form a charging control circuit. A power cord is connected to the input end of the power conversion module, extending out of the charging base to connect to an external power source. The top surface of the charging base has a blackboard eraser slot, within which a charging slot and a first positioning magnet are located. The charging slot contains two spring-loaded pin slots, with the heads of two spring-loaded pins extending from these slots, their other ends connecting to corresponding positions on the main control circuit board. The main control circuit board has indicator lights to indicate different operating states.

[0008] The blackboard eraser slot provides positioning for the eraser's housing when placed on the charging base, while the charging slot accommodates the eraser's charging interface. The power conversion module converts the AC power from the power cord into DC power and transmits it to the rechargeable battery module and main control circuit board (transmission wires not shown), supplying power to the charging device and charging the rechargeable battery. The main control circuit board controls the charging status of the device (charging and stopping), and also controls the indicator light's status (on, off, flashing, and different colored lights). The rechargeable battery module stores electrical energy and continues charging the electric blackboard eraser when the external power supply is cut off.

[0009] In a further technical solution, a heat-conducting sheet is provided below the power conversion module, the rechargeable battery module, and the main control circuit board. The heat-conducting sheet is assembled in the adhesive groove inside the bottom cover of the charging base, and is used to conduct and dissipate heat for the power conversion module, the main control circuit board, and the rechargeable battery module when the charging device is charging.

[0010] In a further technical solution, a hinge hole is provided on each side of one end of the charging base cover, and a corresponding hinge hole is also provided on each side of one end of the charging base. When the charging base cover and the charging base are assembled, two rotating hinges pass through a hinge hole in the charging base cover and a corresponding hinge hole in the charging base, respectively, so that the charging base cover can be opened and closed relative to the charging base. In a further technical solution, support blocks are symmetrically arranged on both sides of the hinge end of the charging base, and the support blocks are provided with hinge holes for supporting the rotating hinges.

[0011] In a further technical solution, the charging base cover has openings at both ends for ventilation and heat dissipation, and anti-slip strips on its top surface and sides to allow users to grip the charging base cover. A hollow observation port is provided at the position corresponding to the indicator light to facilitate observation of the indicator light's illumination status when the charging device is in the closed state, so as to determine the operating status of the charging device.

[0012] In a further technical solution, the bottom of the charging base is provided with multiple anti-slip pads, and the top surface of the charging base is provided with limiting blocks on both sides to restrict the left and right swing of the charging base cover when it is fastened to the charging base. It is also provided with indicator light holes for holding the LED beads of the indicator light. One side is provided with a cable outlet groove for leading out the power cord after assembly, and the other side is provided with a pre-break groove at a symmetrical position. If it is necessary to lead out the power cord from the pre-break groove, the pre-break groove can be broken so that the power cord can be led out from the left or the right to adapt to the different orientation requirements of the charging device.

[0013] In a further technical solution, the charging dock has a bottom opening and a bottom cover, with the bottom cover fixedly installed in the bottom opening. The bottom cover is fixed to the charging dock by screws, and the charging dock has multiple corresponding screw holes inside. The outer side of the bottom cover has several countersunk holes to accommodate the screw heads during assembly, thus securing the bottom cover. A support wall is provided inside the bottom opening to support the bottom cover during assembly, and the support wall has a wire groove for securing the power cord during assembly. The outer side of the bottom cover has anti-slip pad grooves, and multiple anti-slip pads are attached to these grooves.

[0014] In a further technical solution, the blackboard eraser slot is provided with a clearance groove, which is used to avoid several anti-slip strips on the box of the electric dust-removing blackboard eraser when the electric dust-removing blackboard eraser is placed on the charging base.

[0015] In a further technical solution, the first positioning magnet is clipped or pasted in the magnet positioning groove, which is located in the clearance groove inside the blackboard eraser groove, so as to attract each other with the second positioning magnet inside the electric dust removal blackboard eraser. This provides a downward attraction force to the electric dust removal blackboard eraser when it is placed in the blackboard eraser groove of the charging base for charging, so that the dust removal blackboard eraser fits into the blackboard eraser groove.

[0016] In a further technical solution, the power conversion module, the rechargeable battery module, and the main control circuit board are all fixed inside the charging base with screws, and the charging base has multiple corresponding screw holes.

[0017] In a further technical solution, a support plate is provided on the back of the charging slot, and spring pin fixing holes are symmetrically arranged on the support plate for engaging the root of the spring pin.

[0018] In a further technical solution, when the indicator light is assembled, its LED beads are respectively snapped into the indicator light holes of the charging socket, and its pins are soldered to the main control circuit board.

[0019] In a further technical solution, the indicator light includes a first indicator light, a second indicator light, and a third indicator light, which indicate the charging status of the charging device and the power status of the rechargeable battery module. The first indicator light is used to indicate the charging status of the electric dust-removing blackboard eraser: when the electric dust-removing blackboard eraser is undercharged (e.g., power below 25%), the first indicator light flashes red; when the electric dust-removing blackboard eraser is moderately charged (e.g., power between 25% and 75%), the first indicator light flashes yellow; when the electric dust-removing blackboard eraser is fully charged (e.g., power > 75%), the first indicator light flashes green; when the electric dust-removing blackboard eraser is fully charged, the first indicator light remains constantly green. The second indicator light is used to indicate the power status of the rechargeable battery module: when the rechargeable battery module has insufficient power (e.g., below 25%), the second indicator light is solid red; when the rechargeable battery module has moderate power (e.g., between 25% and 75%), the second indicator light is solid yellow; when the rechargeable battery module has sufficient power (e.g., above 75%), the second indicator light is solid green. The third indicator light is used to indicate the connection status of the external power supply: when the power supply is on, the third indicator light is solid green; when the external power supply is off, the third indicator light is solid red or off.

[0020] In a further technical solution, the charging base cover is preferably made of transparent flame-retardant engineering plastic material, such as PC (polycarbonate), so that the user can easily observe the light status of the indicator light through the charging base cover; the charging base and the bottom cover of the charging base are preferably made of flame-retardant engineering plastic material, such as PP (polypropylene) or PC (polycarbonate); the heat-conducting sheet is preferably made of graphite or other materials.

[0021] The charging device for the dust-removing blackboard eraser of this utility model is used to charge the electric dust-removing blackboard eraser. The electric dust-removing blackboard eraser includes an erasing section and a housing. During charging, the top surface of the housing fits into the eraser slot of the charging base. The charging interface of the housing mates with the charging slot of the eraser slot. Symmetrically arranged pins are provided on the charging interface, and these pins abut against spring pins in the charging slot to form a charging circuit for charging. A positioning groove is provided on the housing to position the upper part of the first positioning magnet on the charging base. During charging, the positioning groove mates with the first positioning magnet of the charging base. A second positioning magnet position is provided on the back of the positioning groove to attract the first positioning magnet. Anti-slip strips are symmetrically arranged on both sides of the housing to facilitate removal of the electric dust-removing blackboard eraser from the charging device after charging is complete or when it is needed for use. The erasing section is used to erase chalk marks on the blackboard. When the electric dust-removing blackboard eraser is placed on the charging base for charging, the charging base cover must be fastened to the charging base to prevent the user's fingers from accidentally touching the erasing section and getting chalk dust on them during charging.

[0022] In the above technical solution, when the electric dust-removing blackboard eraser needs to be charged, the charging base cover needs to be opened and the electric dust-removing blackboard eraser placed in the blackboard eraser slot of the charging base, with the erasing part of the electric dust-removing blackboard eraser facing upwards. At this time, the pins of the electric dust-removing blackboard eraser abut against the spring pins respectively. Under the pressure of the electric dust-removing blackboard eraser's own weight, the spring pins maintain close contact with the pins respectively, forming a charging circuit and sending a charging signal to the main control circuit board, and the charging device starts charging. At the same time, the positioning slot of the electric dust-removing blackboard eraser aligns with the upper part of the first positioning magnet. The first positioning magnet and the second positioning magnet built into the electric dust-removing blackboard eraser attract each other, providing additional downward pressure to the electric dust-removing blackboard eraser and improving the stability of the contact between the pins and the spring pins. The blackboard eraser slot can restrict the relative horizontal movement of the electric dust-removing blackboard eraser relative to the charging base during charging, further improving the stability and reliability of charging.

[0023] When charging is complete or the electric dust-removing blackboard eraser needs to be removed, simply flip up the charging base cover and remove the eraser. At this point, the pins and spring pins disconnect, the main control circuit board receives a disconnect signal, and charging stops. In this invention, the number and indication status of indicator lights include, but are not limited to, those described above; the number and position of each screw fixing hole include, but are not limited to, those described above; the connection method between the charging base cover and the charging base bottom cover includes, but is not limited to, the fixing method using screws, but may also be achieved using snap-fit, ultrasonic welding, etc.; the number, shape, and adhesive position of the anti-slip pads include, but are not limited to, those described above.

[0024] The charging device for a dust-removing blackboard eraser proposed in this utility model has the following beneficial effects:

[0025] 1. It adopts a magnetic attraction and contact charging method, ensuring a stable and reliable charging process;

[0026] 2. It adopts a dual power supply scheme of external power supply and built-in rechargeable battery, which improves the charging adaptability and can meet the charging needs when the external power supply is cut off.

[0027] 3. It adopts a simple place-to-charge charging mode, eliminating the need for complicated operations and improving user convenience;

[0028] 4. The charging device has a simple overall structure and is easy to maintain;

[0029] 5. Intuitive indicator lights allow users to easily monitor the device's charging and power storage status. Attached Figure Description

[0030] Figure 1 The diagram shows the closed and open states of the charging device for the dust-removing blackboard eraser in Example 1 (a. closed state, b. open state);

[0031] Figure 2 This is a schematic diagram of the structure of the electric dust-removing blackboard eraser in Example 1 when it is placed in the charging device of the dust-removing blackboard eraser;

[0032] Figure 3 An exploded view of the charging device assembly for the dust-removing blackboard eraser in Example 1;

[0033] Figure 4 This is a schematic diagram of the front and bottom structure of the charging base of the charging device for the dust-removing blackboard eraser in Example 1 (a. front, b. bottom);

[0034] Figure 5 This is a schematic diagram of the front and internal structure of the charging base of the dust removal blackboard eraser charging device in Example 1 (a. front, b. interior);

[0035] Figure 6 This is a schematic diagram of the bottom opening structure of the charging base of the charging device for the dust removal blackboard eraser in Example 1 (a. front, b. bottom opening);

[0036] Figure 7 This is a schematic diagram of the structure of the electric dust-removing blackboard eraser in Example 1;

[0037] Figure 8 This is a cross-sectional structural diagram of the charging device in Example 1;

[0038] Among them, 0100 is the charging base cover, 0101 and 0105 are openings, 0102, 0103a, and 0103b are anti-slip strips; 0104 is a hollow observation port, 0106a and 0106b are hinge holes, 0200 is the first positioning magnet, 0300 is the charging base, 0301a and 0301b are limiting blocks, 0302a and 0302b are support blocks, 0302a1 and 0302b1 are hinge holes, 0303 is the blackboard eraser slot, 0304 is the charging slot, 03041a and 03041b are spring pin slots, 0305, 0306, and 0308 are clearance slots, 0307 is the magnet positioning slot, 0309a, 0309b, and 0309c are indicator light holes, and 0310... The following are the mounting holes for the support plate: 03101a and 03101b are spring pin fixing holes; 0311a, 0311b, 0311c, 0311d, 0311e, 0311f, 0312a, 0312b, 0312c, 0312d, 0313a, 0313b, 0313c, 0313d, 0318a, 0318b, 0318c, 0318d, 0318e, and 0318f are screw fixing holes; 0314 is the support wall; 0315 is the wire channel; 0316 is the wire outlet channel; 0317 is the pre-cut channel; 0400 is the power conversion module; 0500a, 0500b, 0500c, and 0500d are conversion module fixing screws; 0600 is the power cord; 07... 00 is the heat-conducting plate, 0800 is the bottom cover of the charging dock, 0801 is the adhesive groove, 0802a, 0802b, 0802c, 0802d, 0802e, and 0802f are countersunk holes, 0803a and 0803b are anti-slip foot pad grooves, 0900a and 0900b are anti-slip feet, 1000a, 1000b, 1000c, 1000d, 1000e, and 1000f are the fixing screws for the bottom cover of the charging dock, 1100a and 1100b are the rotating hinges, 1200a and 1200b are the spring pins, 1200a1 and 1200b1 are the heads of the spring pins 1200a and 1200b, and 1200a2 and 1200b2 are the ends of the spring pins 1200a and 1200b. At the base, 1300a, 1300b, and 1300c are indicator lights; 1400 is the main control circuit board; 1500a, 1500b, 1500c, 1500d, 1500e, and 1500f are the main control board mounting screws; 1600 is the rechargeable battery module; 1700a, 1700b, 1700c, and 1700d are the rechargeable battery module mounting screws; 1800 is the electric dust-removing blackboard eraser; 1801 is the erasing section; 1802a, 1802b, 1802c, 1802d, 1806, 1807, and 1809 are anti-slip strips; 1803 is the housing; 1804 is the charging interface; 1805a and 1805b are pins; 1808 is the positioning slot; and 1810 is the second positioning magnet. Detailed Implementation

[0039] To more clearly illustrate the technical solution of this utility model, the following description will be made in conjunction with specific embodiments and accompanying drawings. Obviously, the embodiments described below are only some embodiments of this utility model. For those skilled in the art, other examples can be obtained based on these embodiments without creative effort.

[0040] Example 1

[0041] This embodiment 1 relates to a charging device for an electric dust-removing blackboard eraser, specifically including a charging base cover 0100, a first positioning magnet 0200, a charging base 0300, a power conversion module 0400, conversion module fixing screws (specifically including 0500a to 0500d), a power cord 0600, a heat-conducting sheet 0700, a charging base bottom cover 0800, anti-slip pads (specifically including 0900a and 0900b), charging base bottom cover fixing screws (specifically including 1000a to 1000f), a rotating hinge (specifically including 1100a and 1100b), a spring pin (specifically including 1200a and 1200b), an indicator light (specifically including 1300a to 1300c), a main control circuit board 1400, main control board fixing screws (specifically including 1500a to 1500f), a rechargeable battery module 1600, and rechargeable battery module fixing screws (specifically including 1700a to 1700d). The charging device is used to charge the electric dust-removing blackboard eraser 1800.

[0042] The charging base cover 0100 is provided with openings 0101 and 0105 for ventilation and heat dissipation during charging; the charging base cover 0100 is provided with anti-slip strips 0102 and symmetrically distributed 0103a and 0103b on both sides, making it easy for the user to grip the cover to open and close the cover 0100 relative to the charging base 0300; the charging base cover 0100 is provided with a hollow observation port 0104, which allows observation of the indicator light 1300's illumination status when the charging device is in the closed state, to determine the device's operating status; the charging base cover 0100 has openings 0101 and 0105 on both sides. Hinge holes 0106a and 0106b are symmetrically arranged. When the charging cover 0100 is assembled with the charging base 0300, the rotating hinge 1100a passes through the hinge hole 0106a of the charging cover 0100 and the hinge hole 0302a1 of the charging base 0300, and the rotating hinge 1100b passes through the hinge hole 0106b of the charging cover 0100 and the hinge hole 0302b1 of the charging base 0300, so that the charging cover 0100 can be opened and closed relative to the charging base 0300.

[0043] The first positioning magnet 0200 is engaged or attached to the magnet positioning groove 0307 of the charging base 0300, and is used to attract each other with the second positioning magnet 1810 in the electric dust removal blackboard eraser 1800. When the electric dust removal blackboard eraser 1800 is placed in the blackboard eraser groove 0303 of the charging base 0300 for charging, it provides a downward attraction force to the electric dust removal blackboard eraser 1800 so that the dust removal blackboard eraser 1800 fits into the blackboard eraser groove 0303.

[0044] The charging base 0300 is provided with limit blocks 0301a and 0301b to limit the left and right swing of the charging base cover 0100 when it is fastened to the charging base 0300; support blocks 0302a and 0302b are symmetrically arranged on both sides of the charging base 0300; the support block 0302a is provided with the hinge hole 0302a1 to support the rotating hinge 1100a; the support block 0302b is provided with the hinge hole 0302b1 to support the rotating hinge 1100b; the charging base 0300 is provided with a blackboard eraser groove 0303 to accommodate the electric dust-removing blackboard eraser 1800 when it is placed on the charging base 0300. The casing 1803 of the electric dust-removing blackboard eraser 1800 is positioned; a charging slot 0304 is provided inside the eraser slot 0303 to accommodate the charging interface 1804 of the electric dust-removing blackboard eraser 1800 when it is placed on the charging base 0300; the charging slot 0304 is provided with spring pin slots 03041a and 03041b, the spring pin slot 03041a engaging with the head 1200a1 of the spring pin 1200a, and the spring pin slot 03041b engaging with the head 1200b1 of the spring pin 1200b; a clearance groove 0 is provided inside the eraser slot 0303. 305 and 0306 are used to avoid the anti-slip strips 1806 and 1807 on the casing 1803 of the electric dust-removing blackboard eraser 1800 when the electric dust-removing blackboard eraser 1800 is placed on the charging base 0300; the avoidance groove 0306 is provided with a magnet positioning groove 0307 for snapping or attaching the first positioning magnet 0200; the blackboard eraser groove 0303 is provided with the avoidance groove 0308 for avoiding the anti-slip strips 1809 on the casing 1803 of the electric dust-removing blackboard eraser 1800 when the electric dust-removing blackboard eraser 1800 is placed on the charging base 0300; the charging base 0300 is provided with indicator light holes 0309a to 0309c, respectively. The LED beads of the indicator lights 1300a to 1300c are not used for snapping together; a support plate 0310 is provided on the back of the charging base 0300, and the support plate 0310 is symmetrically provided with spring pin fixing holes 03101a and 03101b, which are used to snap together the root 1200a2 of the spring pin 1200a and the root 1200b2 of the spring pin 1200b, respectively; the back of the charging base 0300 is provided with screw fixing holes 0311a to 0311f, which are threaded or self-tapping connected to the main control board fixing screws 1500a to 1500f respectively during assembly, so as to fix the main control circuit board 1400 in the back cavity of the charging base 0300;The back of the charging base 0300 is provided with screw fixing holes 0312a to 0312d, which are threaded or self-tapping connected to the charging battery module fixing screws 1700a to 1700d respectively during assembly to fix the charging battery module 1600 into the back cavity of the charging base 0300; the back of the charging base 0300 is provided with screw fixing holes 0313a to 0313d, which are threaded or self-tapping connected to the conversion module fixing screws 0500a to 0500d respectively during assembly to fix the power conversion module 0400 into the back cavity of the charging base 0300; the back of the charging base 0300 is provided with a support wall 0314 for supporting the charging base bottom cover 0800 during assembly, and the support wall 0314 is provided with a wire groove. 0315 is used to snap the power cord 0600 in place during assembly; a cable outlet groove 0316 is provided on one side of the charging base 0300 for leading out the power cord 0600 after assembly; a pre-cut groove 0317 is provided symmetrically on the other side of the charging base 0300. If it is necessary to lead out the power cord 0600 from the pre-cut groove 0317, the pre-cut groove 0317 can be broken, allowing the power cord 0600 to be led out from the left or right to adapt to different orientation requirements of the charging device; the charging base 0300 is provided with screw fixing holes 0318a~0318f, which are threaded or self-tapping connected to the charging base bottom cover fixing screws 1000a~1000f respectively during assembly to connect and fix the charging base bottom cover 0800 to the charging base 0300.

[0045] The power conversion module 0400 is used to convert the AC power introduced by the power line 0600 into DC power and transmit it to the rechargeable battery module 1600 and the main control circuit board 1400 (transmission wires not shown), so as to provide power to the charging device and charge the rechargeable battery of the rechargeable battery module 1600.

[0046] The heat-conducting sheet 0700 is assembled in the adhesive groove 0801 inside the bottom cover 0800 of the charging base, and is used to conduct heat and dissipate heat for the power conversion module 0400, the main control circuit board 1400, and the rechargeable battery module 1600 when the charging device is charging.

[0047] The outer side of the charging base cover 0800 is provided with several countersunk holes 0802a to 0802f for accommodating the screw heads of the charging base cover fixing screws 1000a to 1000f during assembly; the outer side of the charging base cover 0800 is provided with anti-slip foot pad grooves 0803a and 0803b for attaching the anti-slip foot pads 0900a and 0900b respectively during assembly.

[0048] When the indicator lights 1300a to 1300c are assembled, the LED beads are respectively snapped into the indicator light holes 0309a to 0309c of the charging base 0300, and the pins are soldered to the main control circuit board 1400.

[0049] The main control circuit board 1400 is used to control the charging status of the charging device, i.e., charging and stopping charging, and at the same time, it is used to control the indication status of the indicator lights 1300a to 1300c, i.e., on, off, flashing, and displaying different colors of light.

[0050] The rechargeable battery module 1600 is used to store electrical energy and to continue charging the electric dust-removing blackboard eraser 1800 when the external power supply is cut off.

[0051] The electric dust-removing blackboard eraser 1800 is equipped with an erasing section 1801 for erasing chalk writing on the blackboard. When the electric dust-removing blackboard eraser 1800 is placed on the charging base 0300 for charging, the charging base cover 0100 must be fastened to the charging base 0300 to prevent the user's fingers from accidentally touching the erasing section 1801 and getting chalk dust on them during charging. The electric dust-removing blackboard eraser 1800 is symmetrically provided with anti-slip strips 1802a, 1802b and 1802c, 1802d on both sides to facilitate dispensing from the charging device after charging is complete or when the electric dust-removing blackboard eraser 1800 needs to be used. Remove the electric dust-removing blackboard eraser 1800 from the top; the top surface of the electric dust-removing blackboard eraser box 1803 is in contact with the bottom surface of the positioning groove of the charging base 0300 during charging; the electric dust-removing blackboard eraser 1800 is provided with a charging interface 1804, on which pins 1805a and 1805b are symmetrically arranged, which abut against the spring pins 1200a and 1200b respectively to form a charging circuit for charging during charging; the electric dust-removing blackboard eraser box 1803 is provided with a positioning groove 1808, which is used to provide positioning for the upper part of the first positioning magnet 0200 on the charging base 0300 during charging.

[0052] When the electric dust-removing blackboard eraser 1800 needs to be charged, the charging base cover 0100 should be opened and the electric dust-removing blackboard eraser 1800 should be placed in the blackboard eraser slot 0303 of the charging base 0300, with the erasing part 1801 of the electric dust-removing blackboard eraser 1800 facing upwards. At this time, the pins 1805a and 1805b of the electric dust-removing blackboard eraser 1800 abut against the spring pins 1200a and 1200b respectively. Under the pressure of the electric dust-removing blackboard eraser 1800's own weight, the spring pins 1200a and 1200b maintain close contact with the pins 1805a and 1805b respectively, forming a charging circuit and connecting to the main control circuit board 1400. A charging signal is emitted, and the charging device begins charging. Simultaneously, the positioning groove 1808 of the electric dust-removing blackboard eraser 1800 aligns with the upper part of the first positioning magnet 0200. The first positioning magnet 0200 attracts the second positioning magnet 1810 built into the electric dust-removing blackboard eraser 1800, providing additional downward pressure to the electric dust-removing blackboard eraser 1800 and improving the stability of the contact between the pins 1805a and 1805b and the spring pins 1200a and 1200b. The blackboard eraser groove 0303 can restrict the relative horizontal movement of the electric dust-removing blackboard eraser 1800 relative to the charging base 0300 during charging, further improving the stability and reliability of charging.

[0053] When charging is complete or the electric dust-removing blackboard eraser 1800 needs to be removed, simply flip up the charging base cover 0100 and remove the electric dust-removing blackboard eraser 1800. At this time, the pins 1805a and 1805b will disconnect from the spring pins 1200a and 1200b, and the main control circuit board 1400 will receive the disconnection signal and stop charging.

[0054] The indicator lights 1300a-1300c include a first indicator light 1300a, a second indicator light 1300b, and a third indicator light 1300c, which provide indication based on the charging status of the charging device and the power status of the rechargeable battery module 1600. The first indicator light 1300a indicates the charging status of the electric dust-removing blackboard eraser 1800: when the electric dust-removing blackboard eraser 1800 is undercharged (e.g., below 25%), the first indicator light 1300a flashes red; when the electric dust-removing blackboard eraser 1800 is moderately charged (e.g., between 25% and 75%), the first indicator light 1300a flashes yellow; when the electric dust-removing blackboard eraser 1800 is fully charged (e.g., above 75%), the first indicator light 1300a flashes green; and when the electric dust-removing blackboard eraser 1800 is fully charged, the first indicator light 1300a remains constantly green. The second indicator light 1300b is used to indicate the power status of the rechargeable battery module 1600: when the power of the rechargeable battery module 1600 is insufficient (e.g., below 25%), the second indicator light 1300b is solid red; when the power of the rechargeable battery module 1600 is moderate (e.g., between 25% and 75%), the second indicator light 1300b is solid yellow; when the power of the rechargeable battery module 1600 is sufficient (e.g., above 75%), the second indicator light 1300b is solid green. The third indicator light 1300c is used to indicate the connection status of the external power supply: when the power supply is connected, the third indicator light 1300c is solid green; when the external power supply is disconnected, the third indicator light 1300c is solid red or off.

[0055] The charging base cover 0100 is preferably made of transparent flame-retardant engineering plastic material, such as PC (polycarbonate), so that the user can easily observe the light status of the indicator light 1300 through the charging base cover 0100; the charging base 0300 and the charging base bottom cover 0800 are preferably made of flame-retardant engineering plastic material, such as PP (polypropylene) or PC (polycarbonate); the heat-conducting sheet 0700 is preferably made of graphite or similar material.

[0056] In other embodiments of this utility model, the number and indication status of the indicator lights are not limited to those mentioned above; the number and position of each screw fixing hole are not limited to those mentioned above; the connection method of the charging base cover 0100 and the charging base bottom cover 0800 is not limited to the fixing method of screw connection mentioned above, and can also be connected by buckle, ultrasonic welding or other methods; the number, shape and pasting position of the anti-slip pads 0900 are not limited to those mentioned above.

Claims

1. A charging device for an electric dust-removing blackboard eraser, characterized in that, The charging device for the electric dust-removing blackboard eraser includes a charging base and a charging base cover, with one end of the charging base cover hinged to one end of the charging base. The charging base contains a power conversion module, a rechargeable battery module, and a main control circuit board, which are connected by wires to form a charging control circuit. The input end of the power conversion module is connected to a power cord, which extends out of the charging base to connect to an external power source. The top surface of the charging base has a blackboard eraser slot, which contains a charging slot and a first positioning magnet. The charging slot contains two spring-loaded pin slots, with the heads of the two spring-loaded pins extending from these slots, and their other ends connected to corresponding positions on the main control circuit board. The main control circuit board has indicator lights that indicate different operating states. The power conversion module is used to convert the AC power introduced by the power line into DC power and transmit it to the rechargeable battery module and the main control circuit board; the main control circuit board is used to control the charging status of the charging device and the indication status of the indicator light; the rechargeable battery module is used to store electrical energy and continue to charge the electric dust removal blackboard eraser when the external power is cut off.

2. The charging device for an electric dust-removing blackboard eraser according to claim 1, characterized in that, A heat-conducting sheet is provided below the power conversion module, the rechargeable battery module, and the main control circuit board; the heat-conducting sheet is assembled in the adhesive groove inside the bottom cover of the charging base.

3. The charging device for an electric dust-removing blackboard eraser according to claim 1, characterized in that, The charging base cover has a hinge hole on each side of one end, and the charging base also has a hinge hole on each side of one end. When the charging base cover and the charging base are assembled, the two rotating hinges pass through the hinge hole of the charging base cover and the corresponding hinge hole of the charging base, respectively. Support blocks are symmetrically arranged on both sides of the hinge end of the charging base, and the support blocks are provided with hinge holes.

4. The charging device for an electric dust-removing blackboard eraser according to claim 1, characterized in that, The charging base cover has openings at both ends for ventilation and heat dissipation, anti-slip strips on its top and sides, and a hollow observation port at the position corresponding to the indicator light.

5. The charging device for an electric dust-removing blackboard eraser according to claim 1, characterized in that, The charging base has limit blocks on both sides of its top surface, and indicator light holes are provided on them. One side has a cable outlet groove, and the other side has a pre-break groove at a symmetrical position.

6. The charging device for an electric dust-removing blackboard eraser according to claim 1, characterized in that, The charging base has a bottom opening and a charging base cover that cooperate with each other. A support wall is provided inside the bottom opening, and the support wall has a wire groove. The charging base cover is fixedly installed in the bottom opening. An anti-slip pad groove is provided on the outside of the charging base cover, and multiple anti-slip pads are pasted in the anti-slip pad groove.

7. The charging device for an electric dust-removing blackboard eraser according to claim 1, characterized in that, The first positioning magnet is clipped or pasted in the magnet positioning groove, which is located in the clearance groove inside the blackboard eraser groove.

8. The charging device for an electric dust-removing blackboard eraser according to claim 1, characterized in that, The back of the charging slot is provided with a support plate, and the support plate is symmetrically provided with spring pin fixing holes.

9. The charging device for an electric dust-removing blackboard eraser according to claim 1, characterized in that, The indicator lights include a first indicator light, a second indicator light, and a third indicator light. The first indicator light indicates the charging status of the electric dust-removing blackboard eraser: when the electric dust-removing blackboard eraser's charge level is below 25%, the first indicator light flashes red; when the electric dust-removing blackboard eraser's charge level is between 25% and 75%, the first indicator light flashes yellow; when the electric dust-removing blackboard eraser's charge level is above 75%, the first indicator light flashes green; when the electric dust-removing blackboard eraser is fully charged, the first indicator light is solid green. The second indicator light indicates the charge level of the rechargeable battery module: when the rechargeable battery module's charge level is below 25%, the second indicator light is solid red; when the rechargeable battery module's charge level is between 25% and 75%, the second indicator light is solid yellow; when the rechargeable battery module's charge level is above 75%, the second indicator light is solid green. The third indicator light indicates the connection status of the external power supply: when the power supply is on, the third indicator light is solid green; when the external power supply is off, the third indicator light is solid red or off.

10. The charging device for an electric dust-removing blackboard eraser according to claim 1, characterized in that, The charging device of the electric dust-removing blackboard eraser is used to charge the electric dust-removing blackboard eraser. The electric dust-removing blackboard eraser includes an erasing part and a box. During charging, the top surface of the box is in contact with the blackboard eraser slot of the charging base. The charging interface of the box and the charging slot of the blackboard eraser slot cooperate. The charging interface is symmetrically provided with pins. The pins abut against the spring pins in the charging slot to form a charging circuit for charging. The box is provided with a positioning groove to provide positioning for the upper part of the first positioning magnet on the charging base. During charging, the positioning groove cooperates with the first positioning magnet of the charging base. The back of the positioning groove is provided with a second positioning magnet position that can attract the first positioning magnet. Anti-slip strips are symmetrically provided on both sides of the box.

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