Kinetic energy recovery LED illumination measuring tape

Abstract

A kinetic energy recovery LED illumination measuring tape comprises a tape shell, a tape core, a tape spring, a tape band, a rechargeable battery, a circuit board, an LED substrate and an energy conversion module capable of converting excessive kinetic energy generated by the tape spring into electric energy, the energy conversion module comprises an armature, the armature is composed of multiple stages of coils wound on a fixed iron core, the armature is installed on the inner wall of the tape shell, and the LED substrate is installed on the inner wall of the tape shell. A magnet corresponding to the coil is installed on the side, corresponding to the armature, of the ruler core, when the ruler core rotates rapidly under the action of the ruler spring, the magnet rotates along with the ruler core and cuts magnetic lines of force with the armature to generate current, and meanwhile counter-acting force generated by the armature counteracts rotation torque generated by the ruler spring to achieve speed reduction. According to the utility model, the structural design is reasonable, the electromagnetic induction principle is utilized, excessive kinetic energy generated by the tape spring is reasonably converted into electric energy, the electric energy is stored for illumination, the effect of automatic speed reduction of the tape measure can be achieved in the energy conversion process, the technical problem that the tape measure retracts too fast is effectively solved, and the tape measure is safer to use.

Description

Technical Field

[0001] The utility model relates to a tape measure, in particular to a kinetic energy recovery LED lighting tape measure. Background Art

[0002] A tape measure is a common distance measuring tool. As is well known, a tape measure uses a scroll spring to wind a long strip of tape into a core, and the core is assembled with a tape case to form a complete tape measure.

[0003] When in use, the tape is pulled out, and after use, the elastic potential energy of the tape spring is used to wind the tape into the core. In this process, the elastic potential energy of the tape spring is converted into kinetic energy. However, the retraction speed of the tape measure is very fast, and there is a risk of rapid retraction hurting the user or damaging the tape. During use, it is usually necessary to manually control the retraction speed, which is restricted by the user's usage habits and experience. To solve this problem, slow-retraction tape measures have emerged.

[0004] For example, in the Chinese patent "Slow-retraction Steel Tape Measure" with the patent number CN201110217263.4, a pressure spring piece and an adjustment screw are installed on the steel tape measure; the pressure spring piece presses on the steel tape, and the adjustment screw can adjust the pressure of the pressure spring piece on the steel tape, thereby controlling the retraction speed of the steel tape. However, this type of tape measure requires an adjustment screw and is not simple and convenient enough in terms of structure and use. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a kinetic energy recovery LED lighting tape measure with reasonable structure and safe use in view of the above technical status, which can not only provide lighting but also slow down the retraction of the tape.

[0006] The technical solution adopted by the utility model to solve the above technical problem is: a kinetic energy recovery LED lighting tape measure, including a tape case of the tape measure, a core, a tape spring and a tape installed in the tape case, characterized in that: a rechargeable battery, a circuit board, an LED substrate with LED lamp beads and an energy conversion module capable of converting excessive kinetic energy generated by the tape spring into electric energy are further installed in the tape case; the energy conversion module includes an armature, the armature is composed of multiple coils wound around a fixed iron core, the armature is installed on the inner wall of the tape case, a magnet corresponding to the coil is installed on one side of the core corresponding to the armature, when the core rotates rapidly under the action of the tape spring, the magnet rotates with it to cut the magnetic force line with the armature, the armature generates current, and at the same time, the armature generates a reaction force to counteract the rotational torque generated by the tape spring to achieve deceleration.

[0007] As an improvement, the armature is installed on the rear inner wall of the tape case, the fixed iron cores are arranged at circumferential intervals, the coils are wound around the fixed iron cores, the two ends of the coils are electrically connected to the circuit board, the core is installed in the tape case through a central shaft, the magnet is installed on the rear side of the core, and the position of the magnet corresponds to and cooperates with the coil.

[0008] Further, the circuit board is installed at the bottom inside the ruler case, the rechargeable battery is installed in the triangular space at the lower right side inside the ruler case, the rechargeable battery is electrically connected to the circuit board, the LED substrate is installed at the lower left side of the ruler case, above the ruler tape outlet, the LED substrate is connected to the left end of the circuit board through an FPC cable, an opening for the LED lamp beads to expose is provided on the left side of the ruler case, and an LED lamp cover is provided at the opening.

[0009] Furthermore, a rectifying circuit, an overcurrent protection circuit and a USB charging interface circuit are integrated on the circuit board, a corresponding USB charging port is provided on the right side at the bottom of the ruler case, and a switch button for controlling the LED lighting is further provided at the lower end of the ruler case, corresponding to the bottom of the circuit board.

[0010] Further, the ruler case is formed by the combination of a bottom case and a front cover. A plurality of connecting posts are provided at the edge of the bottom case, corresponding counterbores are provided on the front cover, and after the two are combined, they are fixed by screws, and a hanging buckle is provided on the outer side of the front cover.

[0011] Preferably, the coil has 2 to 16 stages.

[0012] More preferably, the coil and the iron core are arranged at uniform circumferential intervals.

[0013] Preferably, the magnets are arranged at uniform circumferential intervals.

[0014] Finally, the output of the armature energy conversion module is connected to the crest suppression and low-voltage cut-off module after passing through the voltage detection module, and then connected to the full-voltage current-limiting module and then to the low-voltage indication battery over-discharge protection module, and finally connected to the lighting element; meanwhile, the USB charging module is connected to the full-voltage current-limiting module after passing through the overcurrent protection and thermal protection modules.

[0015] Compared with the prior art, the advantages of the present utility model are as follows: an energy conversion module, a rechargeable battery and an LED lamp are arranged inside the ruler case. When the ruler core rotates, using the principle of electromagnetic induction, a current is generated by the magnets and the armature cutting the magnetic force lines, stored in the rechargeable battery for lighting, and at the same time, a reaction force generated by the armature counteracts the rotational torque generated by the ruler spring to achieve deceleration; a rectifying circuit and an overcurrent protection circuit are provided on the circuit board, including the battery and the circuit board. The structure of the present utility model is reasonably designed, the excessive kinetic energy generated by the ruler spring is reasonably converted into electrical energy and stored for lighting, and the effect of automatically decelerating the tape measure can be achieved during the energy conversion process, effectively solving the technical problem of the ruler tape retracting too fast, making the tape measure safer to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of an embodiment of the present utility model;

[0017] Figure 2 Schematic diagram of the structure of another angle of the embodiment of the present utility model;

[0018] Figure 3 Cross-sectional view of the embodiment of the present utility model;

[0019] Figure 4 Another cross-sectional view of the embodiment of the present utility model;

[0020] Figure 5 Exploded view of the embodiment of the present utility model;

[0021] Figure 6 Energy cycle diagram of the embodiment of the present utility model;

[0022] Figure 7 Electrical control schematic diagram of the embodiment of the present utility model. Specific implementation mode

[0023] The present utility model will be further described in detail below in conjunction with the embodiments with reference to the drawings.

[0024] As Figures 1 to 7 shown, a kinetic energy recovery LED lighting tape measure includes a tape shell 1 of the tape measure, a tape core 3, a tape spring 4, a tape 2, a rechargeable battery 8, a circuit board 7, an LED substrate 9 with LED beads 90, and an energy conversion module capable of converting excessive kinetic energy generated by the tape spring 4 into electrical energy. The energy conversion module includes an armature 5, and the armature 5 is composed of 2 to 16 levels of coils 51 wound around a fixed iron core 52. The armature 5 is installed on the inner wall of the tape shell 1. A plurality of magnets 6 corresponding to the coils 51 are installed on one side of the tape core 3 corresponding to the armature 5. When the tape core 3 rotates rapidly under the action of the tape spring 4, the magnets 6 rotate accordingly and make a cutting magnetic force line movement with the armature 5. The armature 5 generates an electric current. At the same time, the armature 5 generates a reaction force to counteract the rotational torque generated by the tape spring 4 to achieve deceleration.

[0025] The specific structure is as follows: The armature 5 is installed on the inner wall at the rear side of the ruler case 1. The armature 5 in this embodiment has a four-stage coil 51, and four fixed iron cores 52 are arranged circumferentially at equal intervals. The coil 51 is wound around the fixed iron cores 52. The two ends a and b of the coil 51 are electrically connected to the circuit board 7. The ruler core 3 is installed in the ruler case 1 through the central axis 10. There are four magnets 6 corresponding to the coil 51, which are respectively embedded in the rear side of the ruler core 3 and are also arranged circumferentially at equal intervals. The positions of the magnets 6 correspond to those of the coil 51 and are close to the coil 51 for easy cooperation between the two. The circuit board 7 is installed at the bottom inside the ruler case 1. The rechargeable battery 8 is installed in the triangular space at the lower right side inside the ruler case 1. The rechargeable battery 8 is electrically connected to the circuit board 7. The LED substrate 9 is installed at the lower left side of the ruler case 1, above the outlet of the ruler tape 2. The LED substrate 9 is connected to the left end of the circuit board 7 through the FPC cable 70. An opening for the LED lamp beads 90 to expose is provided on the left side of the ruler case 1, and an LED lamp cover 20 is provided at the opening. A ruler tape locking button 40 is provided above the LED lamp beads 90 on the left side of the ruler case 1. A rectifying circuit, an overcurrent protection circuit and a USB charging interface circuit 50 are integrated on the circuit board 7. A corresponding USB charging port is provided on the right side at the bottom of the ruler case 1 to facilitate the replenishment of electrical energy through an external power source when the battery is discharged. A switch button 40 for controlling the LED lighting is also provided at the lower end of the ruler case 1, corresponding to the bottom of the circuit board 7. The principle of its circuit module is that the output of the armature energy conversion module is connected to the peak suppression and low-voltage cut-off module after passing through the voltage detection module, and then connected to the full-voltage current-limiting module and then to the low-voltage indication battery over-discharge protection module, and finally connected to the lighting element LED; at the same time, the USB energy replenishment module is connected to the full-voltage current-limiting module after passing through the overcurrent protection and thermal protection modules.

[0026] The ruler case 1 in this embodiment is formed by the combination of a bottom case 11 and a front cover 12. A number of connecting posts are provided at the edge of the bottom case 11, and corresponding counterbores are provided on the front cover 12. After the two are combined, they are fixed by screws, and a hanging buckle 30 is provided on the outer side of the front cover 12.

[0027] The working principle is as follows: The ruler core 3 rotates rapidly under the action of the elastic force of the ruler spring 4. The magnets 6 on the rear side of the ruler core 3 also rotate together to make a magnetic field cutting movement with the armature 5 on the inner wall of the ruler case 1. The armature 5 generates current, and at the same time, the armature 5 generates a reaction force to counteract the rotational torque generated by the ruler spring 4 to achieve the purpose of automatically reducing the winding speed of the ruler tape 2.

[0028] The electrical control principle is as Figure 7As shown, after the armature 5 generates electricity, it is detected by voltage. If the voltage is lower than the charging voltage, it is cut off. If the voltage is too high due to the too-fast recovery speed, crest suppression is performed to protect the battery, the circuit board 7 and other components. If the battery is fully charged, full-charge current limiting protection is performed. After the electric energy is stored, it is discharged and used for LED lighting. The discharge is protected by low voltage to ensure that the battery does not discharge excessively. As another way to supplement the battery energy, the USB charging is protected against overcurrent and electrothermal on the circuit.

[0029] The utility model ingeniously utilizes the principle of electromagnetic induction to reasonably convert the excessive kinetic energy generated by the tape spring 4 into electric energy and store it for lighting, and can also achieve the effect of automatically decelerating the tape measure during the energy conversion process.

[0030] The above are only the preferred embodiments of the utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the technical principle of the utility model, several improvements and refinements can still be made, and these improvements and refinements should also be regarded as the protection scope of the utility model.

Claims

1. A kinetic energy recovery LED lighting tape measure, comprising a tape measure housing, a tape core installed in the tape measure housing, a tape spring and a tape tape, characterized in that: The ruler housing is also equipped with a rechargeable battery, a circuit board, an LED substrate with LED lamp beads, and an energy conversion module that can convert excess kinetic energy generated by the ruler spring into electrical energy. The energy conversion module includes an armature, which is composed of a multi-stage coil wound on a fixed iron core. The armature is installed on the inner wall of the ruler housing, and a magnet corresponding to the coil is installed on one side of the ruler core corresponding to the armature. When the ruler core rotates rapidly under the action of the ruler spring, the magnet rotates accordingly and moves with the armature to cut the magnetic lines of force, and the armature generates current. At the same time, the armature generates a reaction force to counteract the rotational torque generated by the ruler spring to achieve deceleration.

2. The kinetic energy recovery LED lighting tape measure according to claim 1, characterized in that: The armature is mounted on the rear inner wall of the ruler housing, the fixed iron core is arranged at annular intervals, the coil is wound on the fixed iron core, both ends of the coil are electrically connected to the circuit board, the ruler core is mounted in the ruler housing through the central axis, the magnet is mounted on the rear side of the ruler core, and the position of the magnet corresponds to the coil.

3. The kinetic energy recovery LED lighting tape measure according to claim 2, characterized in that: The circuit board is installed at the bottom of the ruler shell, the rechargeable battery is installed in the triangular space on the lower right side of the ruler shell, the rechargeable battery is electrically connected to the circuit board, the LED substrate is installed at the lower left part of the ruler shell and above the ruler tape outlet, the LED substrate is connected to the left end of the circuit board through the FPC cable, and an opening for exposing the LED lamp beads is opened on the left side of the ruler shell, and an LED lamp cover is provided at the opening.

4. The kinetic energy recovery LED lighting tape measure according to claim 3, characterized in that: The circuit board integrates a rectifier circuit, an overcurrent protection circuit and a USB charging interface circuit. A corresponding USB charging port is provided on the right side of the bottom of the ruler shell. A switch button for controlling LED lighting is also provided at the lower end of the ruler shell, corresponding to the bottom of the circuit board.

5. The kinetic energy recovery LED lighting tape measure according to any one of claims 1 to 4, characterized in that: The ruler housing is formed by a bottom shell and a front cover. The edge of the bottom shell is provided with a plurality of connecting columns, and the front cover is provided with corresponding countersunk holes. The two are fixed by screws after being matched, and a hanging buckle is provided on the outer side of the front cover.

6. The kinetic energy recovery LED lighting tape measure according to any one of claims 1 to 4, characterized in that: The coil has 2 to 16 levels.

7. The kinetic energy recovery LED lighting tape measure according to claim 6, characterized in that: The coil and the iron core are arranged at uniform intervals in the circumferential direction.

8. The kinetic energy recovery LED lighting tape measure according to claim 7, characterized in that: The magnets are arranged at even intervals in the annular direction.

9. The kinetic energy recovery LED lighting tape measure according to claim 1, characterized in that: The output of the armature energy conversion module is connected to the peak suppression and low voltage cutoff module after passing through the voltage detection module, and then connected to the low voltage indication battery over-discharge protection module through the full voltage current limiting module, and finally connected to the lighting element; at the same time, the USB energy replenishment module is connected to the full voltage current limiting module after passing through the overcurrent protection and thermal protection module.

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