Stay wire sensor

Abstract

The utility model discloses a stay wire sensor, and aims to solve the problem of measurement inaccuracy caused by unreasonable layout of a winding wheel and unreasonable routing of a stay wire in a traditional stay wire sensor. A first installation groove, a second installation groove, a first wiring groove, a second wiring groove and a wire outlet are formed in a shell of the stay wire sensor, a driving wheel is installed in the first installation groove, a driven wheel is installed in the second installation groove, and the second installation groove, the second wiring groove and the wire outlet are located on the same side of the first installation groove. And the first wiring groove and the second wiring groove are positioned on the same side of the second mounting groove. Mounting grooves corresponding to a driving wheel and a driven wheel are formed in a shell of the stay wire sensor, the input end of a rotary encoder is coaxially connected with the driven wheel, a stay wire is wound around a first winding groove of the driving wheel, when the stay wire is pulled, the driving wheel rotates, the stay wire enters a second winding groove along a first wiring groove, and therefore the driven wheel is driven to rotate, and the stay wire is driven to rotate. The driven wheel drives the input shaft of the rotary encoder to rotate so as to realize displacement measurement.

Description

Technical Field

[0001] This utility model relates to the field of displacement sensor technology, and in particular to a pull-wire sensor. Background Technology

[0002] With the rapid development of science and technology, displacement measurement technology is becoming increasingly important in various industrial and scientific research fields. As a key component of displacement measurement technology, high-precision wire-type displacement sensors stand out among numerous displacement measurement devices due to their high accuracy, fast response, and stable performance, becoming an important cornerstone of modern industrial automation. Wire-type displacement sensors are typically used to measure the displacement of reciprocating motion structures.

[0003] Due to inherent structural limitations of the pull-wire sensor, when the measuring range is large, the pull wire becomes coiled more, causing it to stack. This effectively alters the radius of the winding core, reducing accuracy when calculating the pulled-out length solely by reading the encoder's rotation angle. While the Chinese patent application CN202410715619.4 employs a two-winding-wheel design, it still suffers from poor pull-wire layout, unstable winding of the pull wire onto the second winding wheel, and slippage leading to measurement inaccuracies. Utility Model Content

[0004] The purpose of this invention is to provide a pull-wire sensor that solves the problem of inaccurate measurement caused by the unreasonable layout of the winding wheel and the unreasonable routing of the pull wire in traditional pull-wire sensors.

[0005] To solve the above problems, this utility model provides a pull-wire sensor, including a housing, a driving wheel, a driven wheel, a rotary encoder, and a pull wire;

[0006] The housing has a first mounting groove, a second mounting groove, a first wiring groove, a second wiring groove, and a cable outlet. The drive wheel is installed in the first mounting groove, and the driven wheel is installed in the second mounting groove. The first mounting groove and the second mounting groove are connected through the first wiring groove. The second mounting groove is connected to the cable outlet through the second wiring groove. The second mounting groove, the second wiring groove, and the cable outlet are located on the same side of the first mounting groove. The first wiring groove and the second wiring groove are located on the same side of the second mounting groove.

[0007] The driving wheel has a first winding groove in its circumference, and the driven wheel has a second winding groove in its circumference. The pull wire is wound on the first winding groove, enters the second winding groove along the first wire routing groove, passes through the second wire routing groove, and is led out from the outlet. The driven wheel is sleeved on the input shaft of the rotary encoder, and the housing is fixedly connected to the rotary encoder.

[0008] Preferably, the pull wire is wound no more than three times on the second winding groove, the width of the second winding groove is greater than or equal to the diameter of the pull wire, and the width of the second winding groove is less than twice the diameter of the pull wire.

[0009] Preferably, the side of the housing is formed with a first observation hole and a second observation hole, the first observation hole being flush with the first winding groove and the second observation hole being flush with the second winding groove.

[0010] Preferably, the housing is connected to the rotary encoder by three fixing bolts, which are evenly distributed on the circumferential outer side of the second mounting groove. The first mounting groove, the second mounting groove, the first wiring groove, and the second wiring groove form a boss inside the housing, and one of the three fixing bolts is located on the boss.

[0011] Preferably, the pull-wire sensor further includes a limiting part, a limiting hole is formed on the driven wheel, a limiting surface is formed on one side of the input shaft, the limiting part is disposed in the limiting hole, and one end of the limiting part abuts against the limiting surface.

[0012] Preferably, the limiting part is detachably connected to the limiting hole.

[0013] Preferably, a mounting hole is formed on the side of the housing, the mounting hole communicates with the second mounting groove, and the mounting hole is flush with the limiting hole.

[0014] Preferably, the pull-wire sensor further includes a pull-wire portion located outside the outlet, and the pull-wire portion is fixedly connected to the pull wire.

[0015] Preferably, the diameter of one end of the pull wire portion corresponds to the inner diameter of the wire outlet.

[0016] Preferably, the pull-wire sensor further includes a cover plate, which is bolted to the housing. The cover plate has a first groove and a second groove, the first groove corresponding to the position of the drive wheel and the second groove corresponding to the position of the driven wheel.

[0017] With this configuration, a corresponding mounting slot is provided in the housing of the pull-wire sensor for a driving wheel and a driven wheel. The input end of the rotary encoder is coaxially connected to the driven wheel. The pull wire is wound around the first winding slot of the driving wheel. When the pull wire is under tension, the driving wheel rotates, and the pull wire enters the second winding slot along the first wiring slot, thereby driving the driven wheel to rotate. The driven wheel then drives the input shaft of the rotary encoder to rotate, achieving displacement measurement. By forming the first mounting slot, the second mounting slot, the first wiring slot, the second wiring slot, and the wire outlet within the housing, a stable wiring path is provided for the pull wire. In addition, the second mounting slot, the second wiring slot, and the cable outlet are located on the same side of the first mounting slot, and the first wiring slot and the second wiring slot are located on the same side of the second mounting slot. This layout makes the way the pull wire wraps around the driven wheel more stable, increases the contact length between the pull wire and the driven wheel, and can control the number of turns of the pull wire around the driven wheel. This ensures that the pull wire and the driven wheel can be reliably connected while minimizing the number of turns, avoiding relative slippage between the pull wire and the driven wheel. As a result, the displacement of the pull wire and the rotation of the driven wheel are consistent, ensuring the measurement accuracy of the pull wire sensor. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a pull-wire sensor provided by this utility model;

[0019] Figure 2 This is a top view of the housing of a pull-wire sensor provided by this utility model;

[0020] Figure 3 This is an exploded view of a pull-wire sensor provided by this utility model;

[0021] Figure 4 This is a schematic diagram of a rotary encoder and driven wheel structure for a pull-wire sensor according to the present invention;

[0022] Figure 5 This is a schematic diagram of the housing and drive wheel structure of a pull-wire sensor according to the present invention;

[0023] Figure 6 This is a schematic diagram of the cover plate structure of a pull-wire sensor according to the present invention.

[0024] Figure label:

[0025] 1. Housing; 1a. First mounting slot; 1b. Second mounting slot; 1c. First wiring channel; 1d. Second wiring channel; 1e. Cable outlet; 1f. First observation hole; 1g. Second observation hole; 1h. Mounting hole; 11. Boss; 12. Fixing bolt;

[0026] 2. Drive wheel; 2a. First winding groove;

[0027] 3. Driven wheel; 3a. Second winding groove; 3b. Limiting hole

[0028] 4. Rotary encoder; 41. Input shaft; 41a. Limiting surface;

[0029] 5. Limiting part;

[0030] 6. Pull-out section;

[0031] 7. Cover plate, 7a. First groove; 7b. Second groove. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0033] The accompanying drawings show schematic diagrams of layer structures according to embodiments of the present invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0034] In the description of this utility model, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] Combination Figures 1 to 5This utility model provides a pull-wire sensor, including a housing 1, a driving wheel 2, a driven wheel 3, a rotary encoder 4, and a pull wire; the housing 1 has a first mounting groove 1a, a second mounting groove 1b, a first wiring groove 1c, a second wiring groove 1d, and a wire outlet 1e. The driving wheel 2 is installed in the first mounting groove 1a, and the driven wheel 3 is installed in the second mounting groove 1b. The first mounting groove 1a and the second mounting groove 1b are connected through the first wiring groove 1c, and the second mounting groove 1b is connected to the wire outlet 1e through the second wiring groove 1d. The second wiring groove 1d and the outlet 1e are located on the same side of the first mounting groove 1a, and the first wiring groove 1c and the second wiring groove 1d are located on the same side of the second mounting groove 1b. The driving wheel 2 has a first winding groove 2a in its circumference, and the driven wheel 3 has a second winding groove 3a in its circumference. The pull wire is wound on the first winding groove 2a, enters the second winding groove 3a along the first wiring groove 1c, passes through the second wiring groove 1d, and is led out from the outlet 1e. The driven wheel 3 is sleeved on the input shaft 41 of the rotary encoder 4, and the housing 1 is fixedly connected to the rotary encoder 4. Specifically, the housing 1 serves as the support frame for the pull-wire sensor. The first mounting groove 1a and the second mounting groove 1b inside are used to mount the driving wheel 2 and the driven wheel 3, respectively. The first wire routing groove 1c, the second wire routing groove 1d, and the wire outlet 1e plan the pull-wire path. The first winding groove 2a of the driving wheel 2 is used to wind the pull-wire. When the pull-wire is pulled, the driving wheel 2 rotates. The driven wheel 3 is mounted on the input shaft 41 of the rotary encoder 4, and its second winding groove 3a receives the pull-wire. During the movement of the pull-wire, the driven wheel 3 rotates. The rotational motion of the driven wheel 3 is transmitted to the rotary encoder 4 through the input shaft 41. The rotary encoder 4 receives the rotational motion of the driven wheel 3 through the input shaft 41, converts the mechanical displacement into an electrical signal output, thereby realizing the displacement measurement of the pull-wire. With this configuration, a corresponding mounting groove for a driving wheel 2 and a driven wheel 3 is provided in the housing 1 of the pull-wire sensor. The input end of the rotary encoder 4 is coaxially connected to the driven wheel 3. The pull wire is wound on the first winding groove 2a of the driving wheel 2. When the pull wire is under tension, the driving wheel 2 rotates, and the pull wire enters the second winding groove 3a along the first wiring groove 1c, thereby driving the driven wheel 3 to rotate. The driven wheel 3 drives the input shaft 41 of the rotary encoder 4 to rotate, realizing displacement measurement. By forming the first mounting groove 1a, the second mounting groove 1b, the first wiring groove 1c, the second wiring groove 1d, and the wire outlet 1e in the housing 1, a stable wiring path is provided for the pull wire.In addition, the second mounting groove 1b, the second wiring groove 1d, and the outlet 1e are located on the same side of the first mounting groove 1a, while the first wiring groove 1c and the second wiring groove 1d are located on the same side of the second mounting groove 1b. This layout makes the way the pull wire wraps around the driven wheel 3 more stable, increases the contact length between the pull wire and the driven wheel 3, and can control the number of turns of the pull wire around the driven wheel 3. This ensures that the pull wire and the driven wheel 3 can be reliably connected while minimizing the number of turns, avoiding relative slippage between the pull wire and the driven wheel 3. As a result, the displacement of the pull wire and the rotation of the driven wheel 3 are consistent, ensuring the measurement accuracy of the pull wire sensor.

[0036] It should be noted that a reset device is provided on the drive wheel 2. After the measurement is completed, the reset device drives the drive wheel 2 to rotate in the opposite direction, thereby achieving automatic cable retraction. The specific structure of the reset device is not limited here, nor is its installation method within the drive wheel 2 and housing 1. It only needs to provide tension during the cable pulling process and drive the drive wheel 2 to rotate in the opposite direction after the measurement to achieve cable retraction. Examples of suitable structures include reset bars and return springs. The specific shape and arrangement of the first cable routing groove 1c and the second cable routing groove 1d are also not limited here. Figure 2 As shown, in a preferred embodiment, the first cable routing groove 1c is located tangentially to the circle formed by the first winding groove 2a, and simultaneously tangentially to the circle formed by the second winding groove 3a. This arrangement ensures smooth movement of the cable from the first winding groove 2a to the second winding groove 3a, while preventing the cable from contacting the housing 1 at the first cable routing groove 1c, which could lead to cable wear. The driving wheel 2 and the driven wheel 3 are positioned diagonally opposite to each other on the housing 1. The second cable routing groove 1d is preferably located on the same side as the driving wheel 2 and the driven wheel 3, and the cable movement directions in the first cable routing groove 1c and the second cable routing groove 1d are opposite. For example... Figure 2 During the process of the pull wire being pulled out, the pull wire in the first wire routing groove 1c moves from left to right, and the pull wire in the second wire routing groove 1d moves from right to left. This setting ensures that the pull wire sensor operates smoothly and further improves the connection stability between the pull wire and the driven wheel 3, thus ensuring the accuracy of the measurement results.

[0037] It should be noted that the specific dimensions of the second winding groove 3a are not limited here, nor is the specific winding relationship between the pull wire and the second winding groove 3a limited. In a preferred embodiment, the number of turns of the pull wire on the second winding groove 3a does not exceed three, the width of the second winding groove 3a is greater than or equal to the diameter of the pull wire, and the width of the second winding groove 3a is less than twice the diameter of the pull wire. This arrangement minimizes the number of turns of the pull wire on the second winding groove 3a, and by reducing the width of the second winding groove 3a, the pull wire is arranged in a single layer or a small number of layers within the second winding groove 3a, with each layer tightly fitted to avoid overlap and skipped wires. Through precise design of the winding groove width and the number of turns, it is ensured that the pull wire maintains a regular arrangement during winding, and each layer of pull wire can accurately transmit displacement, improving the accuracy and stability of the sensor and avoiding measurement errors caused by irregular winding. The width of the first winding groove 2a is not limited here, as long as it can accommodate a pull wire of sufficient length.

[0038] like Figures 3 to 5 As shown, in a preferred embodiment, a first observation hole 1f and a second observation hole 1g are formed on the side of the housing 1. The first observation hole 1f is flush with the first winding groove 2a, and the second observation hole 1g is flush with the second winding groove 3a. By providing the first observation hole 1f and the second observation hole 1g on the side of the housing 1, operators can observe the winding status of the pull wires in the first winding groove 2a and the second winding groove 3a through the first observation hole 1f and the second observation hole 1g, respectively. During installation, debugging, or maintenance, the pull wires can be observed through the observation holes to check for misalignment, wear, or loosening. This facilitates intuitive inspection of the pull wire winding status, timely detection and handling of abnormalities, reduces maintenance difficulty, and improves sensor reliability.

[0039] In a preferred embodiment, the housing 1 and the rotary encoder 4 are connected by three fixing bolts 12. These three fixing bolts 12 are evenly distributed around the circumference of the second mounting groove 1b. The first mounting groove 1a, the second mounting groove 1b, the first wiring groove 1c, and the second wiring groove 1d form a boss 11 within the housing 1. One of the three fixing bolts 12 is located on this boss 11. The evenly distributed arrangement of the three fixing bolts 12 along the circumference of the second mounting groove 1b ensures a reliable connection between the rotary encoder 4 and the housing 1. Furthermore, within the confined space of the housing 1, the boss 11 within the housing 1 facilitates the installation of one of the fixing bolts 12, thus improving the space utilization within the housing 1.

[0040] It should be noted that the specific connection method between the rotary encoder 4 and the driven wheel 3 is not limited here, as long as the driven wheel 3 can drive the input shaft 41 of the rotary encoder 4 to rotate. Typically, the input shaft 41 of the rotary encoder 4 needs to be flexibly connected to the driven wheel 3 to prevent damage to the rotary encoder 4 from the driven wheel 3 in extreme cases. Figure 4In a preferred embodiment, a limiting part 5 is provided inside the pull-wire sensor, a limiting hole 3b is formed on the driven wheel 3, and a limiting surface 41a is formed on one side of the input shaft 41. The limiting part 5 is disposed within the limiting hole 3b, and one end of the limiting part 5 abuts against the limiting surface 41a. With this arrangement, one end of the limiting part 5 extends from the limiting hole 3b and abuts against the limiting surface 41a. When the driven wheel 3 rotates, it drives the limiting part 5 to move together, and the limiting part 5 abuts against the limiting surface 41a, preventing relative sliding between the input shaft 41 and the driven wheel 3. This achieves synchronous rotation of the driven wheel 3 and the input shaft 41, protecting the rotary encoder 4 while ensuring the accuracy of power transmission, avoiding measurement errors caused by relative rotation, and improving the accuracy of the sensor.

[0041] The specific connection method between the limiting part 5 and the limiting hole 3b is not limited here. It can be that the limiting part 5 is snapped into the limiting hole 3b within the limiting hole 3b, or that the limiting part 5 is threadedly connected to the inner wall of the limiting hole 3b. This detachable connection between the limiting part 5 and the limiting hole 3b allows for adjustable connection strength between the input shaft 41 of the rotary encoder 4 and the driven wheel 3, facilitating the maintenance and replacement of the rotary encoder 4. Figures 3 to 5 In a preferred embodiment, a mounting hole 1h is formed on the side of the housing 1, which communicates with the second mounting groove 1b and is flush with the limiting hole 3b. This arrangement provides an operating channel for the installation and adjustment of the limiting part 5. During maintenance or replacement of the rotary encoder 4, the limiting part 5 can be tightened or loosened directly through the mounting hole 1h without disassembling additional cable-operated units, thus improving maintenance efficiency and reducing maintenance costs.

[0042] Combination Figures 1 to 3 In a preferred embodiment, a pull wire portion 6 is provided outside the housing 1, located outside the outlet 1e, and fixedly connected to the pull wire. By providing the pull wire portion 6, it facilitates connection of the pull wire to external devices, protects the end of the pull wire from wear or detachment, and improves the convenience and durability of the pull wire sensor. The specific relationship between the pull wire portion 6 and the housing 1 is not limited here; in a preferred embodiment, the diameter of one end of the pull wire portion 6 corresponds to the inner diameter of the outlet 1e. With this configuration, after the pull wire is retracted, the pull wire portion 6 can be installed at the outlet 1e, preventing excessive retraction of the pull wire and affecting subsequent use. It also seals the outlet 1e, preventing external impurities and dust from entering the pull wire sensor along the outlet 1e and damaging it. Preferably, removable sealing components can be provided at the positions of the first observation hole 1f, the second observation hole 1g, and the mounting hole 1h to prevent dust and impurities from entering the pull wire sensor.

[0043] In a preferred embodiment, the pull-wire sensor further includes a cover plate 7, which is bolted to the housing 1. The cover plate 7 has a first groove 7a and a second groove 7b. The first groove 7a corresponds to the position of the driving wheel 2, and the second groove 7b corresponds to the position of the driven wheel 3. This arrangement allows the cover plate 7 to seal the housing 1, preventing dust and debris from entering and extending the sensor's lifespan. Simultaneously, the grooves provide space for the rotation of the driving wheel 2 and the driven wheel 3, ensuring the normal rotation of the wheels and guaranteeing the reliability of the measurement function.

[0044] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A pull-wire sensor, characterized in that, The pull-wire sensor includes a housing (1), a drive wheel (2), a driven wheel (3), a rotary encoder (4), and a pull wire; The housing (1) has a first mounting groove (1a), a second mounting groove (1b), a first wiring groove (1c), a second wiring groove (1d), and a cable outlet (1e). The driving wheel (2) is installed in the first mounting groove (1a), and the driven wheel (3) is installed in the second mounting groove (1b). The first mounting groove (1a) and the second mounting groove (1b) are connected through the first wiring groove (1c). The second mounting groove (1b) is connected to the cable outlet (1e) through the second wiring groove (1d). The second mounting groove (1b), the second wiring groove (1d), and the cable outlet (1e) are located on the same side of the first mounting groove (1a). The first wiring groove (1c) and the second wiring groove (1d) are located on the same side of the second mounting groove (1b). The driving wheel (2) has a first winding groove (2a) in its circumference, and the driven wheel (3) has a second winding groove (3a) in its circumference. The pull wire is wound on the first winding groove (2a). The pull wire enters the second winding groove (3a) along the first wire routing groove (1c) and passes through the second wire routing groove (1d) and is led out from the outlet (1e). The driven wheel (3) is sleeved on the input shaft (41) of the rotary encoder (4). The housing (1) is fixedly connected to the rotary encoder (4).

2. The draw wire sensor according to claim 1, characterized in that, The number of turns of the pull wire on the second winding groove (3a) shall not exceed three, the width of the second winding groove (3a) shall be greater than or equal to the diameter of the pull wire, and the width of the second winding groove (3a) shall be less than twice the diameter of the pull wire.

3. The draw wire sensor according to claim 2, characterized in that, The side of the housing (1) is formed with a first observation hole (1f) and a second observation hole (1g). The first observation hole (1f) is flush with the first winding groove (2a), and the second observation hole (1g) is flush with the second winding groove (3a).

4. The draw wire sensor according to claim 1, characterized in that, The housing (1) is connected to the rotary encoder (4) by three fixing bolts (12). The three fixing bolts (12) are evenly distributed on the circumferential outer side of the second mounting groove (1b). The first mounting groove (1a), the second mounting groove (1b), the first wiring groove (1c), and the second wiring groove (1d) form a boss (11) in the housing (1). One of the three fixing bolts (12) is located on the boss (11).

5. The draw wire sensor according to claim 1, characterized in that, The pull-wire sensor also includes a limiting part (5), a limiting hole (3b) is formed on the driven wheel (3), a limiting surface (41a) is formed on one side of the input shaft (41), the limiting part (5) is disposed in the limiting hole (3b), and one end of the limiting part (5) abuts against the limiting surface (41a).

6. The draw wire sensor according to claim 5, characterized in that, The limiting part (5) is detachably connected to the limiting hole (3b).

7. The draw wire sensor according to claim 6, characterized in that, The housing (1) has a mounting hole (1h) on its side, which is connected to the second mounting groove (1b) and is flush with the limiting hole (3b).

8. The draw wire sensor according to claim 1, characterized in that, The pull-wire sensor also includes a pull-wire part (6), which is located outside the outlet (1e) and is fixedly connected to the pull wire.

9. The draw wire sensor according to claim 8, characterized in that, The diameter of one end of the pull wire part (6) corresponds to the inner diameter of the outlet (1e).

10. The draw wire sensor according to claim 1, characterized in that, The pull-wire sensor also includes a cover plate (7), which is bolted to the housing (1). The cover plate (7) has a first groove (7a) and a second groove (7b). The first groove (7a) corresponds to the position of the drive wheel (2), and the second groove (7b) corresponds to the position of the driven wheel (3).

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