Practical digital display measuring tape convenient to measure

Abstract

The utility model discloses a practical digital display measuring tape convenient to measure, which comprises a shell A, a shell B and a winding and unwinding reel, the shell A and the shell B are detachably connected, the bottoms of the front ends of the shell A and the shell B are integrally formed with a tape outlet, a rotating shaft is arranged in the middle of the inner side of the shell B, the winding and unwinding reel is sleeved on the rotating shaft, a tape is wound on the winding and unwinding reel, and the tape is wound on the winding and unwinding reel. One end of the tape is fixedly connected with the take-up and pay-off reel, the other end of the tape penetrates through the tape outlet, the fixed gate induction sheet is embedded in the tape, the movable gate inductor is fixedly embedded in the bottom of the inner side of the tape outlet, and the liquid crystal display screen is fixedly installed at the top of the tape outlet. According to the utility model, the compatibility of high-precision measurement and traditional scales can be realized through the capacitive grating sensor and the double reading design, the problem of inconvenience in single-person operation is solved by utilizing the magnetic ruler head, and the application scene is widened by adopting the high-performance anti-magnetization ruler belt; the defects of an existing measuring tape in the aspects of precision, operation convenience, durability and function adaptability are effectively overcome.

Description

Technical Field

[0001] This utility model relates to the field of measuring tool technology, and in particular to a convenient and practical digital measuring tape. Background Technology

[0002] In fields such as construction, machinery manufacturing, and home decoration design, the performance of a measuring tape, as a commonly used length measuring tool, directly affects measurement efficiency and accuracy.

[0003] Traditional mechanical measuring tapes obtain measurements by combining the scale on the tape surface with visual estimation, which has the following obvious drawbacks: First, the measurement accuracy is greatly affected by human factors, with estimation errors reaching ±1mm, making it difficult to meet the high precision requirements of scenarios such as precision assembly and electronic component processing; Second, the tape must be manually fixed at both ends during use, which is extremely inconvenient for single-person operation, especially in measurement scenarios where it is difficult to hold on, such as at heights or on vertical surfaces; Third, traditional measuring tapes are mostly made of steel, which is prone to rusting and bending over long-term use, and steel tapes also pose a risk of magnetization. If used to measure magnetically sensitive components such as electronic equipment, it will interfere with measurement accuracy and shorten the service life.

[0004] With the development of electronic technology, digital measuring tapes have emerged. They use sensors to convert tape displacement into electrical signals and display them digitally, thus improving measurement accuracy to some extent. However, existing digital measuring tapes use complex photoelectric or Hall effect sensing technology, resulting in complex internal structures, high costs, and difficult maintenance.

[0005] Therefore, there is an urgent need to design a new type of digital measuring tape that combines high-precision measurement, convenient operation, and high durability to solve the above-mentioned problems in the existing technology. Utility Model Content

[0006] One objective of this invention is to provide a convenient and practical digital measuring tape. This invention achieves high-precision measurement and compatibility with traditional scales through a capacitive grating sensor and a dual-reading design. It also solves the problem of inconvenience for single-person operation by using a magnetic ruler head. Furthermore, it adopts a high-performance anti-magnetic tape to broaden the applicable scenarios and effectively overcome the shortcomings of existing measuring tapes in terms of accuracy, ease of operation, durability, and functional adaptability.

[0007] A convenient and practical digital measuring tape according to an embodiment of the present invention includes a housing A, a housing B, and a take-up and undo roll. The housing A and housing B are detachably connected. The front bottom of the housing A and housing B are integrally formed with a tape outlet. A rotating shaft is centrally located inside the housing B. The take-up and undo roll is sleeved on the rotating shaft. A tape is wound around the take-up and undo roll. One end of the tape is fixedly connected to the take-up and undo roll, and the other end passes through the tape outlet. A fixed grid sensor is embedded inside the tape. A moving grid sensor is fixedly embedded at the bottom inside the tape outlet. An LCD screen is fixedly installed at the top of the tape outlet.

[0008] Furthermore, a magnetic ruler head is fixedly installed at the end of the ruler strip, which can be used to adsorb and fix it to the metal surface.

[0009] Furthermore, the surface of the ruler is printed with graduations.

[0010] Furthermore, bolts are inserted into the lower sides of the housing A, and corresponding screw holes are opened on the lower sides of the interior of the housing B. The bolts can be screwed into the screw holes to achieve the fixed assembly of housing A and housing B.

[0011] Furthermore, a spring is fixedly installed on the inner side of the winding and unwinding mechanism, and the other end of the spring is fixedly connected to the rotating shaft.

[0012] Furthermore, a cover is fixedly installed at the front end of the take-up and unwinding roll by a snap fastener, and the cover can prevent the spring from coming out of the take-up and unwinding roll.

[0013] Furthermore, the front ends of housing A and housing B are provided with latches that can be used to control the locking of the ruler belt.

[0014] Furthermore, the measuring tape is made of a soft base material with anti-breakage, anti-rust, and anti-magnetization properties, which can be adapted to the measurement of various materials such as metal, wood, and plastic.

[0015] Furthermore, the fixed grating sensor and the moving grating sensor constitute a capacitive grating sensor, which calculates the length of the tape through changes in relative displacement electrical signals and displays it on the liquid crystal display screen.

[0016] Furthermore, a locking disc is installed on the inner side of the latch, and the latch locks and unlocks the tape through mechanical friction.

[0017] The beneficial effects of this utility model are:

[0018] 1. In this utility model, a capacitive grating sensor is formed by a fixed grating induction plate embedded inside the tape and a moving grating induction sensor on the inner side of the tape exit. The tape length is accurately calculated by the change in electrical signal generated by the relative displacement, resulting in higher measurement accuracy. Compared with the visual estimation error of traditional mechanical tape measures, the measurement error is significantly reduced, meeting the requirements of precision measurement.

[0019] 2. The scale tape of this utility model is printed with traditional graduations and is equipped with an LCD screen to display digital measurement values ​​in real time. It caters to both users who are used to visual readings and scenarios that require precise values, improving the flexibility of use. In addition, the scale tape is made of soft base material that is resistant to breakage, corrosion, and magnetization, and is suitable for measuring various materials such as metal, wood, and plastic. This avoids the problems of traditional steel tape measures being prone to rust and magnetization, which affect the accuracy of the sensor.

[0020] 3. The magnetic ruler tip at the end of the measuring tape in this utility model can be adsorbed onto metal surfaces such as steel, which solves the problem of needing to manually fix the end point when operating a traditional measuring tape by a single person. It is especially suitable for measurement scenarios that are difficult to hold, such as high altitudes and vertical surfaces, thus improving operating efficiency. Attached Figure Description

[0021] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0022] Figure 1 A schematic diagram of the integrated structure of a convenient and practical digital measuring tape proposed in this utility model;

[0023] Figure 2 This is a schematic diagram of the disassembled structure of a convenient and practical digital measuring tape proposed in this utility model;

[0024] Figure 3 This invention presents a cross-sectional structural diagram of the tape of a digital measuring tape that is convenient and practical for measurement.

[0025] In the diagram: 1. Housing A; 2. Scale tape; 3. Magnetic scale head; 4. LCD display screen; 5. Fixed grid sensor plate; 6. Locking buckle; 7. Scale; 8. Scale outlet; 9. Housing B; 10. Rotating shaft; 11. Winding mechanism; 12. Spring; 13. Cover; 14. Moving grid sensor; 15. Bolt; 16. Screw hole. Detailed Implementation

[0026] To make the technical means and objectives and effects of this utility model easier to understand, the embodiments of this utility model will be described in detail below with reference to specific figures.

[0027] It should be noted that all directional and positional terms used in this utility model, such as "upper," "lower," "front," "rear," "inner," and "outer," are only used to explain the relative positional relationships and connection arrangements between components in a specific state (as shown in the accompanying drawings). They are merely for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. Furthermore, descriptions involving "first," "second," etc., in this utility model are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated.

[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0030] like Figure 1-3 As shown, this utility model discloses a convenient and practical digital measuring tape, including a housing A1, a housing B9, and a winding / unwinding mechanism 11. Housing A1 and housing B9 are detachably connected via bolts 15 and screw holes 16, facilitating maintenance and replacement of internal components. Both housings have an integrally formed tape outlet 8 at their front bottom, from which the tape 2 extends. A fixed-grid sensor 17 is embedded within the tape outlet 8. A moving-grid sensor 14 at the bottom inner side of the tape outlet 8, together with the fixed-grid sensor 17, constitutes a capacitive grating sensor. A liquid crystal display 4 on the top displays the measured length.

[0031] In actual use, pull the magnetic ruler head 3 to pull the ruler strip 2 out from the ruler outlet 8. The ruler head is attracted to the measurement starting point. After the ruler strip is taut, push the locking buckle 6 to lock the position. Directly read the value on the LCD screen 4 or observe the scale 7. After the measurement is completed, unlock the locking buckle 6. The spring 12 drives the winding and unwinding 11 to automatically wind back the ruler strip. The cover 13 ensures the stable operation of the spring. When it is necessary to inspect the internal parts, unscrew the bolt 15 to separate the housing, and then disassemble the winding and unwinding 11 or replace the ruler strip 2.

[0032] As an example of this application, a magnetic ruler head 3 is fixedly installed at the end of the ruler strip 2. A permanent magnet is embedded inside the head 3, allowing it to adhere to metal surfaces such as steel, facilitating the fixation of the ruler strip end during single-person operation. Standard graduations 7 are printed on the surface of the ruler strip 2, satisfying both traditional scale reading and digital display reading requirements.

[0033] As an example of this application, bolts 15 are inserted into the lower sides of the housing A1, and screw holes 16 are opened at the corresponding positions of the housing B9. When the bolts 15 are screwed into the screw holes 16, the axial force generated by the threaded engagement tightly fixes the two housings. When disassembling, the housings can be separated simply by unscrewing the bolts, which is convenient to operate.

[0034] As an example of this application, a spring-loaded spring 12 is installed inside the winding coil 11, with one end fixed to the rotating shaft 10 and the other end connected to the inner wall of the winding coil 11. When the tape 2 is pulled out, the spring-loaded spring 12 is stretched and stores force; when the tape is released, the spring returns to its original position and drives the winding coil 11 to rotate, thereby achieving automatic winding of the tape. The front end of the winding coil 11 is fixed to the cover 13 by a buckle, and the cover 13 has an annular limiting groove on its inner side to lock the end of the spring-loaded spring 12 and prevent it from coming out.

[0035] As an example of this application, a latch 6 is provided at the front end of the housing, with an inner locking disc (not shown). When the latch 6 is pushed to the locked position, the locking disc presses against the surface of the tape 2, using mechanical friction to prevent the tape from moving; when unlocking, the locking disc returns to its original position, and the tape can slide freely. This structure amplifies the operating force through the lever principle, ensuring reliable locking and effortless operation.

[0036] As an example of this application, the tape 2 is made of modified PVC soft base material, with an internal composite fiber reinforcement layer and a rust-proof coating on the surface. It has the properties of being resistant to breakage, corrosion, and magnetization, and is suitable for measuring the surfaces of various materials such as metal, wood, and plastic. This avoids the problem of traditional steel tape measures being easily magnetized and affecting the accuracy of the capacitive grating sensor.

[0037] As an example of this application, the capacitive grating sensor consists of a fixed grating sensing element 17 and a moving grating sensor 14. The fixed grating sensing element 17 has sensing electrodes evenly distributed along the length of the tape, and the moving grating sensor 14 has built-in emitter and receiver electrodes. When the tape is pulled out, the relative displacement between the moving grating and the fixed grating causes a change in capacitance. The signal is amplified and converted from analog to digital by the internal circuit of the housing, and the microprocessor calculates the displacement, finally displaying a value accurate to 0.1 mm on the LCD screen 4.

[0038] Working principle: During measurement, as the tape 2 is pulled out, the moving grating sensor 14 and the fixed grating sensor 17 generate relative displacement. The capacitive grating sensor converts the mechanical displacement into an electrical signal. After processing the signal, the circuit system displays the measured length in real time on the LCD screen 4. The spring 12 provides winding power, the locking buckle 6 locks the tape through mechanical friction, the magnetic tape head 3 helps to fix the measuring end point, and the anti-magnetized tape 2 ensures that the capacitive grating sensor is not affected by external magnetic fields, thus achieving high-precision and convenient measurement operation.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A convenient and practical digital measuring tape, characterized in that, Includes housing A (1), housing B (9) and take-up / unwind roll (11). Housing A (1) and housing B (9) are detachably connected. Housing A (1) and housing B (9) have an integrally formed exit opening (8) at the bottom front end. A rotating shaft (10) is centrally located inside housing B (9). The take-up / unwind roll (11) is sleeved on the rotating shaft (10). A ruler strip (2) is wound around the take-up / unwind roll (11). One end of the ruler strip (2) is fixedly connected to the take-up / unwind roll (11), and the other end passes through the exit opening (8). A fixed grid sensor (17) is embedded inside the ruler strip (2). A moving grid sensor (14) is fixedly embedded at the bottom inside the exit opening (8). A liquid crystal display screen (4) is fixedly installed on the top of the exit opening (8).

2. The convenient and practical digital measuring tape according to claim 1, characterized in that, The end of the ruler (2) is fixedly equipped with a magnetic ruler head (3) that can be used to adsorb and fix it to the metal surface.

3. The convenient and practical digital measuring tape according to claim 1, characterized in that, The ruler (2) has graduations (7) printed on its surface.

4. The convenient and practical digital measuring tape according to claim 1, characterized in that, Bolts (15) are inserted into the lower sides of the housing A (1), and corresponding screw holes (16) are opened on the lower sides of the interior of the housing B (9). The bolts (15) can be screwed into the screw holes (16) to achieve the fixed assembly of housing A (1) and housing B (9).

5. A convenient and practical digital measuring tape according to claim 1, characterized in that, A spring (12) is fixedly installed on the inner side of the winding and unwinding mechanism (11), and the other end of the spring (12) is fixedly connected to the rotating shaft (10).

6. A convenient and practical digital measuring tape according to claim 1, characterized in that, The front end of the take-up and unwind roll (11) is fixedly installed with a cover (13) by a buckle. The cover (13) can prevent the spring (12) from coming out of the take-up and unwind roll (11).

7. A convenient and practical digital measuring tape according to claim 1, characterized in that, The front ends of housing A (1) and housing B (9) are provided with latches (6) that can be used to control the locking of the ruler (2).

8. A convenient and practical digital measuring tape according to claim 1, characterized in that, The fixed grid sensor (17) and the moving grid sensor (14) constitute a capacitive grid sensor, which calculates the length of the tape by the change of relative displacement electrical signal and displays it on the liquid crystal display screen (4).

9. A convenient and practical digital measuring tape according to claim 7, characterized in that, The locking plate is installed on the inner side of the latch (6), and the latch (6) locks and unlocks the tape (2) through mechanical friction.

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