A pull cord sensor

Abstract

This invention discloses a pull-cord sensor, comprising a pull-cord sensor body, a lubrication chamber, a rubber sleeve, and a dust removal sleeve. The pull-cord sensor body has a wire outlet hole on one side, and one end of the lubrication chamber is connected to the wire outlet hole. An oil guide ring is provided inside the lubrication chamber, and a rubber sleeve is provided at the other end of the lubrication chamber. A dust removal sleeve is provided at the end of the rubber sleeve furthest from the lubrication chamber. The pull cord in the pull-cord sensor body passes sequentially through the wire outlet hole, the lubrication chamber, the rubber sleeve, and the dust removal sleeve. In this invention, by setting up a dust removal sleeve and allowing the pull cord of the pull-cord sensor to pass through it, dust, debris, and moisture adhering to the surface of the pull cord can be effectively removed. This protects the pulley and wire outlet inside the pull-cord sensor, and also seals the grease in the lubrication chamber, preventing grease leakage and further isolating the pull cord surface from dust, debris, and moisture.

Description

Technical Field

[0001] This invention relates to a sensor, and more particularly to a pull-cord sensor. Background Technology

[0002] The drawstring sensor is an ingenious structural design that combines the advantages of angle sensors and linear displacement sensors. It is a sensor with small installation size, compact structure, large measurement stroke, and high accuracy, with a stroke ranging from hundreds of millimeters to tens of meters.

[0003] Existing draw rope sensors suffer from significant dust, debris, and moisture buildup on the outside of the draw rope during use. This can easily damage the internal pulleys and cable outlet, causing the sensor to malfunction. Additionally, the lubricating oil in the draw rope sensor can leak during use, making it easier for dust to adhere to the wire rope. Therefore, a draw rope sensor that can prevent both dust and moisture intrusion and lubricating oil leakage is needed. Summary of the Invention

[0004] The purpose of this invention is to provide a pull-string sensor to solve the above-mentioned technical problems.

[0005] The technical solution adopted in this invention is as follows:

[0006] A pull-cord sensor includes a pull-cord sensor body, a lubrication chamber, a rubber sleeve, and a dust removal sleeve. The pull-cord sensor body has a wire outlet hole on one side. One end of the lubrication chamber is connected to the wire outlet hole. An oil guide ring is provided inside the lubrication chamber. The rubber sleeve is provided at the other end of the lubrication chamber. The dust removal sleeve is provided at the end of the rubber sleeve away from the lubrication chamber. The pull-cord in the pull-cord sensor body passes through the wire outlet hole, the lubrication chamber, the rubber sleeve, and the dust removal sleeve in sequence.

[0007] Preferably, the inner cavity of the rubber sleeve is divided into two centrally connected annular cavities by an annular protrusion integrally formed with the inner wall of the rubber sleeve. The pull rope passes through the center of the two annular cavities in sequence, and the surface of the pull rope slides in contact with the inner wall of the annular protrusion.

[0008] Preferably, the inner cavity of the rubber sleeve is divided into 2N annular cavities by 2N-1 annular protrusions integrally formed with the inner wall of the rubber sleeve, where N is a positive integer greater than or equal to 2. The pull rope passes through the center of several of the annular cavities in sequence, and the surface of the pull rope slides in contact with the inner wall of the annular protrusions.

[0009] As a further preferred embodiment, for the N annular cavities near the lubrication chamber, the diameter of the N annular cavities decreases sequentially along the direction from the lubrication chamber to the dust removal sleeve, and the axial width of the annular cavities also decreases sequentially.

[0010] For the N annular cavities near the dust removal sleeve, the diameter of the N annular cavities decreases sequentially along the direction from the dust removal sleeve to the lubrication chamber, and the axial width of the annular cavities also decreases sequentially.

[0011] As a further preferred embodiment, the 2N annular cavities have the same diameter, the same axial width, and the same axial spacing between any two adjacent annular cavities.

[0012] Preferably, the dust removal sleeve has a threading hole in the middle, and a soft scraper is provided on the outer edge of the end of the threading hole away from the rubber sleeve. The soft scraper has a through hole in the middle for the pull rope to pass through, and the outer edge of the inner peripheral wall of the through hole is arc-shaped.

[0013] Preferably, the device also includes a mounting bracket disposed on the main body of the pull rope sensor. The mounting bracket includes a first mounting plate, which is detachably connected to the lower end of the main body of the pull rope sensor. Each of the included angle positions of the first mounting plate is provided with a first mounting hole.

[0014] As a further preferred embodiment, the mounting plate also includes a plurality of elastic sheets disposed in a circular groove in the middle of the first mounting plate, wherein the plurality of elastic sheets are evenly distributed in the groove with the center of the groove as the center and in the circumferential direction.

[0015] As a further preferred embodiment, one end of each elastic piece protrudes outward from the top surface of the groove, and the other end is connected to the bottom surface of the groove. When the pull rope sensor is fixed to the external structure by the mounting bracket, the external structure presses the elastic piece inward, causing the protruding end of the elastic piece to return to the groove, thereby achieving stable installation and absorbing vibration.

[0016] As a further preferred embodiment, the system also includes a second mounting plate, which is disposed on one side of the first mounting plate and is arranged in an L-shape with respect to the first mounting plate.

[0017] The above technical solution has the following advantages or beneficial effects:

[0018] (1) In this invention, by setting a dust removal sleeve and allowing the pull rope of the tension sensor to pass through the dust removal sleeve, the dust, debris and moisture attached to the surface of the pull rope can be effectively removed, thereby protecting the pulley inside the pull rope sensor and the outlet of the wire.

[0019] (2) In this invention, through the cooperation of the lubrication chamber and the oil guide ring, the grease in the lubrication chamber can adhere to the surface of the pull rope through the oil guide ring, thereby lubricating the pull rope;

[0020] (3) In this invention, by setting a rubber sleeve and setting an annular cavity inside the rubber sleeve, the grease in the lubrication chamber can be sealed to prevent grease leakage and to isolate dust, debris and moisture on the surface of the pull rope. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the rope sensor in this invention;

[0022] Figure 2 This is a cross-sectional view of the lubrication chamber, rubber sleeve, and dust removal sleeve in this invention;

[0023] Figure 3 This is a schematic diagram of the internal structure of the rubber sleeve in another embodiment of the present invention.

[0024] In the diagram: 1. Main body of the pull rope sensor; 2. Lubrication chamber; 3. Rubber sleeve; 4. Dust removal sleeve; 5. Oil guide ring; 6. Mounting bracket; 61. First mounting plate; 62. Second mounting plate; 63. Elastic sheet; 64. Groove; 65. First mounting hole; 66. Second mounting hole; 8. Annular cavity; 9. Threading hole; 10. Soft scraper; 11. Pull rope. Detailed Implementation

[0025] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be noted that terms such as "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 invention 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 invention. Furthermore, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this invention, 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 invention based on the specific circumstances.

[0028] Figure 1 This is a schematic diagram of the structure of the rope sensor in this invention; Figure 2 This is a cross-sectional view of the lubrication chamber, rubber sleeve, and dust collector sleeve in this invention. See also... Figure 1-2 As shown, a preferred embodiment is illustrated, illustrating a pull-cord sensor, including a pull-cord sensor body 1, a lubrication chamber 2, a rubber sleeve 3, a dust removal sleeve 4, an oil guide ring 5, and a mounting bracket 6. The pull-cord sensor body 1 has a wire outlet hole on one side, one end of the lubrication chamber 2 is connected to the wire outlet hole, the lubrication chamber 2 has an oil guide ring 5 inside, and the other end of the lubrication chamber 2 has a rubber sleeve 3. The end of the rubber sleeve 3 away from the lubrication chamber 2 has a dust removal sleeve 4. The pull-cord 11 in the pull-cord sensor body 1 passes sequentially through the wire outlet hole, the lubrication chamber 2, the rubber sleeve 3, and the dust removal sleeve 4. The pull-cord sensor body 1 is also equipped with a mounting bracket 6.

[0029] In this embodiment, see Figure 1 As shown, the lubrication chamber 2 is integrally connected to the pull rope sensor body 1. The oil guide ring 5 is set in the cylindrical cavity of the lubrication chamber 2 and is passed through the central hole by the pull rope 11. One end of the rubber sleeve 3 is tightly attached to the other end of the lubrication chamber 2. The dust removal sleeve 4 is used to initially remove dust, debris, etc. from the surface of the pull rope 11, while the rubber sleeve 3 is used to seal the grease in the lubrication chamber 2 to prevent grease leakage and to further isolate dust, debris, and moisture from the surface of the pull rope 11. The mounting bracket 6 facilitates the installation of the pull rope sensor body 1 on an external structure. A power cord is provided at the upper end of the pull rope sensor body 1 for powering the pull rope sensor body 1.

[0030] Furthermore, as a preferred implementation method, see [link to previous document]. Figure 2 As shown, in this example, the inner cavity of the rubber sleeve 3 is divided into two centrally connected annular cavities 8 by an annular protrusion integrally formed with the inner wall of the rubber sleeve 3. The pull rope 11 passes through the center of the two annular cavities 8 in sequence, and the surface of the pull rope 11 makes slight sliding contact with the inner wall of the annular protrusion. For these two annular cavities 8, the main function of the annular cavity 8 on the side closer to the lubrication chamber 2 is to intercept the grease flowing into the rubber sleeve 3 through the pull rope 11 and prevent grease leakage; the main function of the annular cavity 8 on the side closer to the dust removal sleeve 4 is to prevent the remaining dust and moisture from entering the lubrication chamber 2 and mixing with the grease after the dust removal sleeve 4 has initially removed dust and moisture.

[0031] In other preferred embodiments, see Figure 3 As shown, the inner cavity of the rubber sleeve 3 is divided into 2N annular cavities 8 by 2N-1 annular protrusions integrally formed with the inner wall of the rubber sleeve 3, where N is a positive integer greater than or equal to 2. In this example, four annular cavities 8 are arranged side by side at equal intervals (more can be created as needed, for example, 2N, where N is a positive integer greater than or equal to 2). The pull rope 11 passes through the center of the four annular cavities 8 in sequence, and the surface of the pull rope 11 makes slight sliding contact with the inner wall of several annular protrusions. For the four annular cavities 8, the two annular cavities 8 on the side closer to the lubrication chamber 2 mainly function to intercept the grease flowing into the rubber sleeve 3 through the pull rope 11, thus preventing grease leakage.

[0032] Furthermore, depending on the actual situation, the diameter and width of several annular cavities 8 can be consistent or inconsistent. For example, along the direction from the lubrication chamber 2 to the dust removal sleeve 4, the diameter of the annular cavity 8 decreases sequentially, and the axial width of the annular cavity also decreases sequentially (the purpose is to have a larger outer volume, which can accommodate more grease first, and a larger cross-sectional area, making it less likely for further penetration). The main function of the two annular cavities 8 on the side closer to the dust removal sleeve 4 is to prevent the remaining dust and moisture from entering the lubrication chamber 2 and mixing with the grease after the dust removal sleeve 4 has initially removed dust and moisture. Also, along the direction from the dust removal sleeve 4 to the lubrication chamber 2, the diameter of the annular cavity 8 decreases sequentially, and the width of the annular cavity also decreases sequentially (the purpose is to have a larger outer volume, which can accommodate more moisture and dust first, and a larger cross-sectional area, making it less likely for further penetration).

[0033] Furthermore, as a preferred embodiment, a soft scraper 10 (e.g., rubber) is provided on the outer edge of the end of the wire hole 9 inside the dust removal sleeve 4 away from the rubber sleeve 3. The soft scraper 10 is used to initially remove dust and debris from the surface of the pull rope 11. In this embodiment, the scraper 10 has a through hole in the middle for the pull rope 11 to pass through, and the outer edge of the inner peripheral wall of the through hole is curved to avoid scratching the pull rope 11.

[0034] Furthermore, as a preferred embodiment, the mounting bracket 6 includes a first mounting plate 61, which is detachably connected to the lower end of the pull-cord sensor body 1. A first mounting hole 65 is provided at an included angle on the first mounting plate 61. In this embodiment, the device can be connected to an external structure either through the first mounting hole 65 on the first mounting plate 61 or through the second mounting hole 66 on the second mounting plate 62. Connecting bolts can be provided in either the first mounting hole 65 or the second mounting hole 66.

[0035] Furthermore, as a preferred embodiment, a preset gap is provided between one end of each elastic piece 63 and the first mounting plate 61.

[0036] Furthermore, as a preferred embodiment, the mounting bracket 6 further includes a second mounting plate 62, which is disposed on one side of the first mounting plate 61, and the second mounting plate 62 and the first mounting plate 61 are arranged in an "L" shape. The outer edge of the second mounting plate 62 may be provided with a plurality of second mounting holes 66. In this embodiment, see [reference needed]. Figure 1 As shown, a circular groove 64 is provided in the middle of the first mounting plate 61, and a number of elastic sheets 63 are evenly distributed in the groove 64 with the center of the groove as the center and along the circumference.

[0037] One end of the elastic piece 63 protrudes outward from the top surface of the groove 64, while the other end of the elastic piece 63 is connected to the bottom surface of the groove 64. When installing the pull rope sensor body 1, the first mounting plate 61 is aligned with the installation position, and the elastic pieces 63 are aligned with the installation position. Then, the second mounting plate 62 is connected to the external structure, and the elastic pieces 63 abut against the external structure, pressing the elastic pieces 63 so that the part of the elastic piece 63 protruding from the groove enters the groove 64. When the pull rope sensor body 1 vibrates, the elastic pieces 63 can absorb the vibration force, protect the pull rope sensor body 1, and increase the stability of the pull rope sensor operation.

[0038] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A pull-cord sensor, characterized in that, The device includes a pull-cord sensor body, a lubrication chamber, a rubber sleeve, and a dust removal sleeve. The pull-cord sensor body has a wire outlet hole on one side. One end of the lubrication chamber is connected to the wire outlet hole. An oil guide ring is provided inside the lubrication chamber. The rubber sleeve is provided at the other end of the lubrication chamber. The dust removal sleeve is provided at the end of the rubber sleeve away from the lubrication chamber. The pull cord in the pull-cord sensor body passes through the wire outlet hole, the lubrication chamber, the rubber sleeve, and the dust removal sleeve in sequence. The inner cavity of the rubber sleeve is divided into two centrally connected annular cavities by an annular protrusion integrally formed with the inner wall of the rubber sleeve. The pull rope passes through the center of the two annular cavities in sequence, and the surface of the pull rope slides in contact with the inner wall of the annular protrusion. The annular cavity near the lubrication chamber primarily functions to intercept grease flowing into the rubber sleeve via the pull rope, preventing grease leakage. The annular cavity near the dust removal sleeve primarily functions to prevent remaining dust and moisture from entering the lubrication chamber and mixing with the grease after the dust removal sleeve has performed initial dust and moisture removal.

2. The drawstring sensor as described in claim 1, characterized in that, The inner cavity of the rubber sleeve is divided into 2N annular cavities by 2N-1 annular protrusions integrally formed with the inner wall of the rubber sleeve, where N is a positive integer greater than or equal to 2. The pull rope passes through the center of several of the annular cavities in sequence, and the surface of the pull rope slides in contact with the inner wall of the annular protrusion.

3. The drawstring sensor as described in claim 2, characterized in that, For the N annular cavities near the lubrication chamber, along the direction from the lubrication chamber to the dust removal sleeve, the diameter of the N annular cavities decreases sequentially, and the axial width of the annular cavities also decreases sequentially. For the N annular cavities near the dust removal sleeve, the diameter of the N annular cavities decreases sequentially along the direction from the dust removal sleeve to the lubrication chamber, and the axial width of the annular cavities also decreases sequentially.

4. The drawstring sensor as described in claim 2, characterized in that, The 2N annular cavities have the same diameter, the same axial width, and the same axial spacing between any two adjacent annular cavities.

5. The drawstring sensor as described in claim 1, characterized in that, The dust removal sleeve has a threading hole in the middle, and a soft scraper is provided on the outer edge of the end of the threading hole away from the rubber sleeve. The soft scraper has a through hole in the middle for the pull rope to pass through, and the outer edge of the inner peripheral wall of the through hole is arc-shaped.

6. The drawstring sensor as described in claim 1, characterized in that, It also includes a mounting bracket disposed on the main body of the pull rope sensor, the mounting bracket including a first mounting plate, the first mounting plate being detachably connected to the lower end of the main body of the pull rope sensor, and a first mounting hole being provided at each included angle position of the first mounting plate.

7. The drawstring sensor as described in claim 6, characterized in that, It also includes a plurality of elastic sheets disposed in a circular groove in the middle of the first mounting plate, wherein the plurality of elastic sheets are evenly distributed in the groove with the center of the groove as the center and in the circumferential direction.

8. The drawstring sensor as described in claim 7, characterized in that, One end of each elastic sheet protrudes outward from the top surface of the groove, and the other end is connected to the bottom surface of the groove. When the pull rope sensor is fixed to the external structure by the mounting bracket, the external structure presses the elastic sheet inward, causing the protruding end of the elastic sheet to return to the groove, thereby achieving stable installation and absorbing vibration.

9. The drawstring sensor as described in claim 6, characterized in that, It also includes a second mounting plate, which is disposed on one side of the first mounting plate, and the second mounting plate and the first mounting plate are arranged in an L-shape.

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