A length measuring instrument

Abstract

The utility model provides a length measuring instrument relates to the field of measurement technology, including frame, length measuring wheel group, transmission gear group and signal generator, length measuring wheel group includes first length measuring wheel and second length measuring wheel who sets side by side, first length measuring wheel and second length measuring wheel form the clamping gap for clamping the material of being measured between, first length measuring wheel and second length measuring wheel all rotatably connect in frame, transmission gear group's input and at least one length measuring wheel's wheel axle transmission connection, signal generator with transmission gear group's output is connected. Compact structure, effectively prevent measuring skidding, signal conversion stability, length measurement precision is high.

Description

Technical Field

[0001] This utility model relates to the field of metrology technology, specifically to a length measuring instrument. Background Technology

[0002] In continuous production fields such as textiles, wire and cable, and papermaking, precise metering and length control of moving materials such as cables and fabrics are often required. Existing technologies employ a single measuring wheel in contact with the material for metering, but this method suffers from significant measurement errors due to material slippage. To further improve accuracy, a solution has emerged that uses a pair of measuring wheels to clamp the material, increasing friction. However, these improved solutions still have room for structural optimization. For example, how to more effectively convert the rolling of the wheel assembly into a precise and stable electrical signal, and how to simplify the overall structure to improve versatility and reliability, remain pressing issues to be addressed in this field.

[0003] Therefore, this utility model proposes a length measuring instrument. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model proposes a length measuring instrument with a compact structure, effectively preventing slippage during measurement, stable signal conversion, and high length measurement accuracy.

[0005] The technical solution of this utility model is implemented as follows:

[0006] A length measuring instrument includes a frame, a measuring wheel assembly, a transmission gear assembly, and a signal generator;

[0007] The measuring wheel assembly includes a first measuring wheel and a second measuring wheel arranged side by side, with a clamping gap between the first measuring wheel and the second measuring wheel for clamping the material to be measured; both the first measuring wheel and the second measuring wheel are rotatably connected to the frame.

[0008] The input end of the transmission gear set is connected to the axle of at least one measuring wheel;

[0009] The signal generator is connected to the output end of the transmission gear set.

[0010] Preferably, the first measuring wheel is fixedly installed on the frame; the second measuring wheel is hinged to the frame via a swing arm, and an elastic pressing mechanism for providing pressure to the clamping gap is provided between the frame and the swing arm.

[0011] Preferably, the elastic compression mechanism is a spring.

[0012] Preferably, the spring is a compression spring, with one end connected to the frame and the other end connected to the swing arm.

[0013] Preferably, the input end of the transmission gear set is connected to the axle of the first measuring wheel.

[0014] Preferably, the outer periphery of the first measuring wheel and / or the second measuring wheel is provided with a friction bushing.

[0015] Preferably, the signal generator is a rotary encoder, and the rotating shaft of the rotary encoder is coaxially connected to the output end of the transmission gear set.

[0016] Preferably, the signal generator includes a magnet and a reed switch. The magnet is fixed to a gear at the output end of the transmission gear set, and the reed switch is fixed to the frame and arranged opposite to the rotation trajectory of the magnet.

[0017] Compared with the prior art, the present invention has the following advantages.

[0018] By integrating a pair of parallel, rotatable measuring wheels with a transmission gear set and a signal generator in a specific structure, the following significant technical effects were achieved: First, the layout of the double wheels clamping the material being measured, combined with an elastic pressure mechanism, provides a uniform and stable clamping force, fundamentally and effectively eliminating slippage during the measurement process and ensuring the accuracy of the measurement benchmark. Second, the transmission gear set transmits and accelerates the rotation of the measuring wheels, achieving reliable motion transmission on one hand, and providing the downstream signal generator with a more easily identifiable and countable rotational speed on the other, greatly improving the resolution and stability of signal generation. Finally, the signal generator accurately converts the mechanical rotation into an electrical signal, providing a reliable data foundation for subsequent precise meter counting and automatic control. The entire device has a reasonable structural design, efficiently integrating anti-slip, transmission, and signal conversion functions, ensuring high measurement accuracy while also possessing the advantages of low cost, high reliability, and ease of integration and maintenance. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a length measuring instrument according to the present invention;

[0021] Figure 2 This is a schematic diagram of the signal generator in Example 1;

[0022] Figure 3This is a schematic diagram of the signal generator in Example 1;

[0023] Attached diagram labels: 1-Frame; 2-First measuring wheel; 3-Second measuring wheel; 4-Elastic pressure mechanism; 5-Swing arm; 6-Transmission gear set; 7-Rotary encoder; 8-Magnet; 9-Reed switch; 10-Friction bushing. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," "third," and "fourth," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, 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 or an electrical 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.

[0027] Example 1

[0028] This embodiment provides a high-precision length measuring instrument. For example... Figure 1 As shown, it mainly includes a frame 1, a length measuring wheel group, a transmission gear group 6, and a signal generator.

[0029] The measuring wheel assembly includes a first measuring wheel 2 and a second measuring wheel 3 arranged side by side, forming a clamping gap between the two wheels for holding the material being measured (such as cables or fabrics). The first measuring wheel 2 is fixedly mounted on the frame 1 via bearings and axles. The second measuring wheel 3 is hinged to the frame 1 via an L-shaped swing arm 5. Specifically, the middle part of the swing arm 5 is hinged to the frame 1 via a pivot or pin, allowing the swing arm 5 to swing around the hinge point, thereby achieving a floating installation of the second measuring wheel 3.

[0030] To achieve reliable clamping and prevent slippage during measurement, an elastic pressure mechanism 4 is provided between the frame 1 and the short arm end of the swing arm 5. In this embodiment, the elastic pressure mechanism 4 is a compression spring. The upper end of the compression spring abuts against an adjusting bolt or fixing boss on the frame 1, while the lower end presses against the swing arm 5, thereby providing a continuous and adjustable pressure to the second measuring wheel 3, ensuring that it constantly presses against the material being measured and the first measuring wheel 2.

[0031] To further increase friction, friction bushings 11 made of rubber or polyurethane are fitted around the outer circumference of both the first measuring wheel 2 and the second measuring wheel 3.

[0032] The input end of the transmission gear set 6 is coaxially connected to the axle of the fixed first measuring wheel 2. In this embodiment, the transmission gear set 6 consists of at least two stages of meshing gears. For example, a small gear fixed on the axle of the first measuring wheel 2 meshes with an intermediate large gear in the first stage, and the small gear coaxial with the intermediate large gear meshes with an output large gear in the second stage. The total transmission ratio of this gear system is greater than one, forming an acceleration gear system. Its function is to convert the relatively slow rotation of the measuring wheel into high-speed rotation, thereby facilitating high-resolution acquisition of subsequent signals.

[0033] like Figure 2 As shown, the signal generator is a rotary encoder 7. The rotating shaft of the rotary encoder 7 is coaxially connected to the axle of the final output gear of the transmission gear set 6. When the material being measured drives the length measuring wheel set to rotate, this rotation is amplified by the acceleration gear system and drives the rotary encoder 7 to rotate at high speed. The encoder then outputs a high-frequency pulse signal, with each pulse corresponding to a precise length unit, thereby achieving high-precision length measurement.

[0034] Example 2

[0035] This embodiment provides an economical length measuring instrument. Its mechanical structure, including the frame 1, measuring wheel assembly, transmission gear set 6, swing arm 5, and elastic pressure mechanism 4, is the same as or similar to that of Embodiment 1, and will not be described again here.

[0036] The main difference between this embodiment and Embodiment 1 lies in the type and composition of the signal generator, which is designed to meet application scenarios with stricter cost control.

[0037] like Figure 3 As shown, in this embodiment, the signal generator includes a magnet 8 and a reed switch 9. The magnet 8 is fixedly mounted on the end face of the final output gear of the transmission gear set 6 and rotates with it. The reed switch 9 is fixedly mounted on the frame 1 by a bracket, and its mounting position corresponds to the rotation trajectory of the magnet 8, ensuring that the magnet 8 passes close to the reed switch 9 once for each rotation of the output shaft.

[0038] Its working principle is as follows: When the transmission gear set 6 drives the magnet 8 to rotate close to the reed switch 9, the reed inside the reed switch 9 closes instantaneously under the action of the magnetic field, generating an electrical pulse signal; when the magnet 8 moves away, the reed opens due to its own elasticity. Thus, a switching signal is generated for each rotation of the output shaft. By counting the number of switching signals and combining the single-signal equivalent length calculated by "circumference of the measuring wheel / total gear transmission ratio", fixed-length measurement and control can be achieved. This scheme has a simple structure, low cost, and strong anti-interference ability.

[0039] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A length measuring instrument, characterized in that, Includes frame (1), measuring wheel set, transmission gear set and signal generator; The measuring wheel assembly includes a first measuring wheel (2) and a second measuring wheel (3) arranged side by side, with a clamping gap between the first measuring wheel (2) and the second measuring wheel (3) for clamping the material to be measured; both the first measuring wheel (2) and the second measuring wheel (3) are rotatably connected to the frame (1). The input end of the transmission gear set is connected to the axle of at least one measuring wheel; The signal generator is connected to the output end of the transmission gear set.

2. The length measuring instrument according to claim 1, characterized in that: The first measuring wheel (2) is fixedly installed on the frame (1); the second measuring wheel (3) is hinged to the frame (1) through a swing arm (5), and an elastic pressure mechanism (4) for providing pressure to the clamping gap is provided between the frame (1) and the swing arm (5).

3. A length measuring instrument according to claim 2, characterized in that: The elastic pressure mechanism (4) is a spring.

4. A length measuring instrument according to claim 3, characterized in that: The spring is a compression spring, with one end connected to the frame and the other end connected to the swing arm (5).

5. A length measuring instrument according to claim 2, characterized in that: The input end of the transmission gear set is connected to the axle of the first measuring wheel (2).

6. A length measuring instrument according to claim 4, characterized in that: Friction bushings (10) are provided on the outer periphery of the first measuring wheel (2) and / or the second measuring wheel (3).

7. A length measuring instrument according to claim 1, characterized in that: The signal generator is a rotary encoder (7), and the rotating shaft of the rotary encoder (7) is coaxially connected to the output end of the transmission gear set.

8. A length measuring instrument according to claim 1, characterized in that: The signal generator includes a magnet (8) and a reed switch (9). The magnet (8) is fixed to a gear at the output end of the transmission gear set, and the reed switch (9) is fixed to the frame (1) and is arranged opposite to the rotation trajectory of the magnet (8).

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