Stay wire sensor

Abstract

The utility model discloses a stay wire sensor, and aims to solve the problems of interweaving and stacking in the process of winding a roll core by a stay wire in a traditional stay wire sensor, and the problem of sudden change of the winding diameter caused by circle-by-circle stacking. The stay wire sensor comprises a shell, a winding core assembly, a stay wire and a rotary encoder, the winding core assembly comprises a winding core shaft and a first track, one end of the stay wire is fixed to the winding core assembly, the stay wire is wound on the first track in a stacked mode, the width of the first track is the same as or similar to the diameter of the stay wire, and the first track is of an equidistant spiral structure; and the roll core shaft is sleeved on the input shaft of the rotary encoder. When the stay wires are stored on the first track, the stay wires can be stacked layer by layer, only one circle of stay wires exist in each layer, the situation that the stay wires are interwoven and stacked after being recycled is effectively prevented, the first track is arranged to be of an equidistant spiral structure, it is ensured that the situation that the radius of the track is locally changed suddenly is avoided, and the service life of the track is prolonged. And the accuracy of the measurement result is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to displacement measurement technical field especially relates to a wire stretching sensor. BACKGROUND

[0002] Wire stretching sensor as a kind of sensor for measuring displacement, with the characteristics of high precision, can obtain displacement data information in real time, widely used in engineering test, the storage mode of internal pull wire of wire stretching sensor is a design emphasis of wire stretching sensor, due to its own wide range of length measurement characteristics, the length of pull wire is usually longer.

[0003] In prior art, the winding core structure design of wire stretching sensor often has defects, resulting in pull wire multi-layer side-by-side winding, and the phenomenon of interlacing, stacking and the like is extremely likely to occur, which affects the measurement accuracy.In addition, the number of turns and the radius of the winding are getting larger due to the stacking of pull wire, and the diameter of each turn is suddenly changed during the winding process of the traditional winding track, thereby causing discontinuous measurement and calculation, and the measurement error is further increased by multi-turn stacking, which affects the accuracy of measurement results. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a kind of wire stretching sensor, to solve the problem of interlacing and stacking in the process of winding winding core in traditional wire stretching sensor, and the problem of sudden change of winding diameter caused by stacking of each turn, which reduces the measurement accuracy.

[0005] To solve the above problems, the utility model provides a kind of wire stretching sensor, including shell, winding core assembly, pull wire and rotary encoder;

[0006] The winding core assembly is arranged in the shell, the winding core assembly includes winding core shaft and first track, one end of the pull wire is fixed on the winding core assembly, the pull wire is stacked and wound on the first track, the width of the first track is the same as or similar to the diameter of the pull wire, the first track is equidistant spiral structure, the winding core shaft is sleeved on the input shaft of the rotary encoder, the shell is formed with wire outlet, and the pull wire is led out along the wire outlet.

[0007] Preferably, the winding core assembly further includes first side plate, connecting part, second side plate and second track, the first side plate is fixedly connected with the connecting part, the first track is sleeved on the connecting part, the first side plate abuts against the first track, the second side plate is fixedly connected with the second track, the second track is sleeved on the connecting part, the second side plate abuts against the first track, and the second track is concentric with the winding core shaft.

[0008] Preferably, the side of the connecting part is formed with a plurality of first connecting holes which are uniformly distributed along the side of the connecting part, the side of the second rail is formed with a plurality of second connecting holes which are uniformly distributed along the side of the second rail, and the plurality of first connecting holes correspond to the plurality of second connecting holes one by one.

[0009] Preferably, the winding core shaft is formed with a mounting hole, the input shaft is formed with a limiting surface, and a limiting pin is arranged at the mounting hole and abuts against the limiting surface through the mounting hole.

[0010] Preferably, the side of the second rail is formed with a first operation hole, and the center of the first operation hole is flush with the center of the mounting hole.

[0011] Preferably, the side of the shell is formed with a second operation hole, and the center of the second operation hole is flush with the center of the first operation hole.

[0012] Preferably, the highest point of the second operation hole is not lower than the highest point of the second connecting hole.

[0013] Preferably, the pull wire sensor further comprises a reset spring connected with the winding core shaft, the winding core assembly further comprises a third side plate connected with the second side of the second rail, and one side of the reset spring abuts against the third side plate.

[0014] Preferably, the shell comprises a first shell and a second shell, the first shell is formed with a containing groove, the reset spring is arranged in the containing groove, the diameter of the third side plate is greater than the diameter of the containing groove, and the third side plate is located at the top end of the containing groove.

[0015] Preferably, the pull wire sensor further comprises a lead part, the lead part is detachably connected with the wire outlet, one end of the pull wire is fixed on the lead part, and the wire outlet is flush with the first rail.

[0016] By such arrangement, the first track is arranged in the winding core assembly, the width of the first track is arranged to be equal to or close to the diameter of the pull wire, so that when the pull wire is accommodated on the first track, the pull wires can be stacked together layer by layer, and in each layer, only one circle of pull wire exists, so that the arrangement can effectively prevent the pull wires from being intertwined and stacked after being recycled, ensure that the arrangement of the pull wire in the first track is determined, so that the reading of the rotary encoder and the length of the pull wire drawn have a relatively determined relationship, thereby greatly improving the measurement accuracy; the first track is arranged as an equidistant spiral structure, which ensures that the track radius will not have a local radius mutation, and the pull wire can be smoothly transitioned every time it is wound, and the calculation of the pull wire length according to the rotary encoder reading has continuity, further improving the accuracy of the measurement result. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a whole structure schematic diagram of a pull wire sensor according to the present application;

[0018] Figure 2 is Figure 1 A-A sectional view in

[0019] Figure 3 is a structure explosion schematic diagram of a pull wire sensor according to the present application;

[0020] Figure 4 is a structure schematic diagram of a winding core assembly and a rotary encoder of a pull wire sensor according to the present application;

[0021] Figure 5 is a structure schematic diagram of a first track, a connecting part and a first side plate of a pull wire sensor according to the present application.

[0022] REFERENCE SIGNS:

[0023] 1, shell; 1a, wire outlet; 1b, second operation hole; 11, first shell; 11a, accommodating groove; 12, second shell;

[0024] 2, winding core assembly;

[0025] 21, winding core shaft; 21a, mounting hole;

[0026] 22, first track;

[0027] 23, first side plate;

[0028] 24, connecting part; 24a, first connecting hole;

[0029] 25, second side plate;

[0030] 26, second rail; 26a, second connecting hole; 26b, first operating hole;

[0031] 27, third side plate;

[0032] 3, pull wire;

[0033] 4, rotary encoder; 41, input shaft; 41a, limit surface;

[0034] 5, reset spring;

[0035] 6, lead wire part. DETAILED DESCRIPTION

[0036] To make the purpose, technical scheme and advantages of the present application more clear and understandable, the present application will be further described in detail below with reference to the drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of known structures and techniques is omitted to avoid unnecessary confusion of the concept of the present application.

[0037] In the drawings, a schematic diagram of a layer structure according to an embodiment of the present application is shown. These drawings are not drawn to scale, in which certain details are exaggerated for the purpose of clarity, and certain details can be omitted. The shapes of various regions, layers shown in the drawings, and their relative size, positional relationship may deviate in actuality due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes, relative positions can be additionally designed by those skilled in the art according to actual needs.

[0038] In the description of the present application, it should be noted that the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0039] In combination Figures 1 to 4The utility model provides a kind of wire pulling sensor, including shell 1, roll core subassembly 2, pull wire 3 and rotary encoder 4;Roll core subassembly 2 is arranged in shell 1, and roll core subassembly 2 includes roll core shaft 21 and first track 22, and one end of pull wire 3 is fixed on roll core subassembly 2, and pull wire 3 is stacked and is arranged on first track 22, and the width of first track 22 is same or approximate with the diameter of pull wire 3, and first track 22 is equidistant spiral structure, and roll core shaft 21 is sleeved on the input shaft 41 of rotary encoder 4, and shell 1 is formed with outlet 1a, and pull wire 3 is led out along outlet 1a.Through such setting, first track 22 is arranged in roll core subassembly 2, and the width of first track 22 is set to be equal or close to the diameter of pull wire 3, so when pull wire 3 is housed on first track 22, it can be added together layer by layer, and in each layer, only one circle of pull wire 3 exists, so setting can effectively prevent pull wire 3 from appearing interlaced stacking adverse conditions after recycling, ensure that the arrangement state of pull wire 3 in first track 22 is determined, so that the reading of rotary encoder 4 and the length of pull wire 3 pulled have relatively determined relationship, and then greatly improve the precision of measurement;First track 22 is set as equidistant spiral structure, ensure that the track radius does not appear the case of local radius mutation, and pull wire 3 can be smoothly transitioned every circle, and the length of pull wire 3 is calculated according to the reading of rotary encoder 4 with continuity, to further improve the accuracy of measurement result.

[0040] It should be noted that the specific width of the first track 22 is not limited here, which can meet the winding of the pull wire 3 along the first track 22, and the pull wire 3 can be stacked layer by layer on the first track 22, and the width of the first track 22 can be equal to the diameter of the pull wire 3, or can be slightly larger than the diameter of the pull wire 3, which can ensure that the pull wire 3 can be smoothly wound and pulled out on the first track 22. Generally, the superposition of linear motion and circular motion will form a spiral curve, and when the speed ratio of linear motion to circular motion is a fixed value, the spiral expands the same distance every rotation period, and such a spiral curve is called an equidistant spiral. The first track 22 is arranged in an equidistant spiral structure, specifically, the first track 22 is not circular, that is, the first circle and each circle of the pull wire 3 wound on the first track 22 is not circular, but an equidistant spiral line with a gradually uniform increasing winding radius, that is, the radius of each circle increases linearly with the winding of the pull wire 3. Through such an arrangement, the length of the pull wire 3 retracted, that is, the length of the pull wire 3 wound on the first track 22, is directly related to the original diameter of the first track 22, the diameter of the pull wire 3, the radius increase value of the equidistant spiral track rotating one circle, and the number of rotations of the rotary encoder 4, and is determined and continuous, thereby avoiding local mutations of the winding radius and improving the continuity and accuracy of the measurement. Here, the radius increase value of the equidistant spiral track rotating one circle is not limited, which can make the radius of the first track 22 gradually and smoothly change during one rotation, thereby avoiding sudden changes in the winding radius of the pull wire 3. In the preferred case, the change value of the radius of the equidistant spiral structure of the first track 22 rotating one circle is equal to the diameter of the pull wire 3, that is, the change value of the current winding radius of the pull wire 3 on the first track 22 after the pull wire 3 rotates one circle around the first track 22 is equal to the diameter of the pull wire 3, thereby enabling the pull wire 3 to transition to the next circle more smoothly, and improving the stability of the winding core assembly 2 during rotation.

[0041] Here, the upper and lower limiting ways of the winding direction of the pull wire 3 during the winding process of the pull wire 3 on the first track 22 can be to provide side plates on both sides of the first track 22, or to directly form a baffle in the shell 1 to limit the pull wire 3 from jumping out. In combination with the above description of the winding direction of the pull wire 3, the side plates can be arranged on both sides of the first track 22 to limit the winding direction of the pull wire 3, or the baffle can be arranged in the shell 1 to limit the winding direction of the pull wire 3. Figures 3 to 5 In the preferred case, the winding core assembly 2 further comprises a first side plate 23, a connecting portion 24, a second side plate 25, and a second track 26. The first side plate 23 is fixedly connected with the connecting portion 24, the first track 22 is sleeved on the connecting portion 24, and the first side plate 23 abuts against the first track 22. The second side plate 25 is fixedly connected with the second track 26, the second track 26 is sleeved on the connecting portion 24, and the second side plate 25 abuts against the first track 22. The second track 26 is concentric and coaxial with the winding core shaft 21. Specifically, as shown in FIG. 2, the first side plate 23 is arranged on one side of the connecting portion 24, and the second side plate 25 is arranged on the other side of the connecting portion 24. The first track 22 is sleeved on the connecting portion 24, and the second track 26 is sleeved on the connecting portion 24. The first side plate 23 and the second side plate 25 are arranged on both sides of the connecting portion 24, and the first track 22 and the second track 26 are arranged on the connecting portion 24. Figure 3 and Figure 4As shown, the first side plate 23 is arranged above the first track 22, the connecting portion 24 is fixedly connected or integrally formed with the first side plate 23, and the first track 22 is sleeved on the connecting portion 24, and at this time, the first side plate 23 abuts against the top of the first track 22. The outer wall of the connecting portion 24 is connected with the inner wall of the second track 26, and the bottom of the first track 22 abuts against the second side plate 25 on the top of the second track 26, so as to form a winding space of the pull wire 3 between the first side plate 23 and the second side plate 25, and the pull wire 3 is stably wound on the first track 22 through the first side plate 23 and the second side plate 25. Through such arrangement, the winding core assembly 2 is divided into the first track 22 and the second track 26, and the stable winding of the pull wire 3 is realized through the first side plate 23 and the second side plate 25, preferably, the connecting portion 24 and the second track 26 are detachably connected inside, which is beneficial to the maintenance and replacement of the winding core assembly 2, ensures the stability of the pull wire 3 in the process of storage and release, reduces the shaking, and improves the working reliability and service life of the pull wire sensor.

[0042] It should be noted that the specific shapes of the outer wall of the connecting portion 24 and the inner wall of the second track 26 are not limited here, and preferably, both are circular, and the centers of the two circles coincide with the rotation axis of the winding core shaft 21. Through such arrangement, the rotation center of the winding core assembly 2 and the rotation axis of the winding core shaft 21 coincide, so that the rotation process is more stable, and the influence of vibration of the pull wire length sensor on the measurement result in the use process is reduced. Further, when the first track 22 is sleeved on the connecting portion 24, the inner side of the first track 22 is also circular, and the diameter thereof is adapted to the outer diameter of the connecting portion 24.

[0043] The specific connection mode of the connecting portion 24 and the second track 26 is not limited here, which can be that threads are arranged at the positions where the connecting portion 24 and the second track 26 are in contact, and the connecting portion 24 and the second track 26 are connected through threads, or the connecting portion 24 and the second track 26 can be connected through connecting holes and connecting columns arranged at the positions where the connecting portion 24 and the second track 26 are in contact, and the connecting columns are inserted into the connecting holes to realize the fixed connection of the connecting portion 24 and the second track 26. In the preferred case, a plurality of first connecting holes 24a are formed on the side surface of the connecting portion 24, the first connecting holes 24a are uniformly distributed along the side surface of the connecting portion 24, a plurality of second connecting holes 26a are formed on the side surface of the second track 26, the second connecting holes 26a are uniformly distributed along the side surface of the second track 26, and the first connecting holes 24a and the second connecting holes 26a correspond one by one. Specifically, the first connecting holes 24a and the second connecting holes 26a correspondingly and uniformly distributed, and the connecting columns such as bolts or screws, not shown in the figure, are arranged to realize the reliable connection of the connecting portion 24 and the second track 26, so as to ensure that the second track 26 and the connecting portion 24 and the first track 22 rotate synchronously in the rotation process of the winding core shaft 21, maintain the structural stability of the winding core assembly 2, facilitate assembly, improve the connection strength, ensure the long-term stable operation of the sensor, and avoid measurement errors caused by looseness.

[0044] Combining Figure 4 In the preferred embodiment, the winding core shaft 21 is provided with a mounting hole 21a, the input shaft 41 is provided with a limiting surface 41a, a limiting pin is arranged at the mounting hole 21a, and the limiting pin abuts against the limiting surface 41a through the mounting hole 21a. Specifically, the mounting hole 21a of the winding core shaft 21 accommodates the limiting pin, and the limiting surface 41a of the input shaft 41 abuts against the limiting pin, thereby preventing relative rotation between the winding core shaft 21 and the input shaft 41, ensuring transmission accuracy, and improving measurement accuracy. In the preferred embodiment, the side surface of the second rail 26 is provided with a first operation hole 26b, and the center of the first operation hole 26b is flush with the center of the mounting hole 21a. By arranging the first operation hole 26b on the second rail 26, an installation and dismounting operation channel of the limiting pin is provided, and the mounting hole 21a and the limiting pin can be operated through the first operation hole 26b without dismounting too many components, thereby facilitating the installation and maintenance of internal components and reducing the operation difficulty. Figure 3 Further, the side surface of the housing 1 is provided with a second operation hole 1b, and the center of the second operation hole 1b is flush with the center of the first operation hole 26b. Through such an arrangement, the center of the second operation hole 1b is flush with the center of the first operation hole 26b, so that a tool can pass through the first operation hole 26b and the second operation hole 1b in sequence, without dismounting the housing 1, directly maintaining the internal components through the second operation hole 1b and the first operation hole 26b, further simplifying the maintenance process, improving the use convenience, and reducing the maintenance time.

[0045] It should be noted that the second connecting hole 26a and the first operation hole 26b on the second rail 26 need to be staggered, that is, the second connecting hole 26a and the first operation hole 26b need to be arranged on different cross sections of the second rail 26, and the second connecting hole 26a and the first operation hole 26b are not on the same circle, so as to ensure the strength of the second rail 26 itself. In the preferred embodiment, the highest point of the second operation hole 1b is not lower than the highest point of the second connecting hole 26a. Specifically, the hole diameter of the second operation hole 1b is greater than the hole diameter of the second connecting hole 26a, and the position of the second connecting hole 26a is arranged in the horizontal position of the second operation hole 1b, and the connection between the connecting part 24 and the second rail 26 can also be checked and maintained through the second operation hole 1b.

[0046] It should be noted that the specific connection mode of the winding core shaft 21 and the first rail 22 and the second rail 26 in the winding core assembly 2 is not limited here, and the first rail 22 and the second rail 26 can be arranged as a solid structure and directly fixedly connected with the winding core shaft 21. In the preferred embodiment, the winding core assembly 2 further comprises a third side plate 27, and the third side plate 27 is connected with the second side of the second rail 26. Specifically, as shown in Figure 4As shown, the third side plate 27 is a disc structure, the third side plate 27 is fixedly connected with the winding core shaft 21, forming a structure similar to a tray, the first track 22, the connecting part 24 and the second track 26 are all hollow cylindrical structures, and the first side plate 23 and the second side plate 25 are circular ring structures with a certain width. Through such a setting, the winding space of the pull wire 3 is realized, and the weight of the winding shaft assembly is also reduced, so that the winding core assembly 2 rotates more easily during the storage and release of the pull wire 3. Here, the specific way of recycling the pull wire 3 in the pull wire sensor is not limited, which can be manual recycling by setting a mechanical structure, such as a hand-cranking recycling mode, or setting a reset elastic structure in the shell, storing elastic potential energy during the pulling out of the pull wire 3, and releasing the elastic potential energy when the pull wire 3 is recycled, so as to realize the automatic recycling of the pull wire 3. Specifically, the pull wire sensor further comprises a reset spring 5, the reset spring 5 is connected with the winding core shaft 21, and one side of the reset spring 5 abuts against the third side plate 27. By setting the reset spring 5 to store and release elastic potential energy, a reset force is provided for the recycling of the pull wire 3.

[0047] In combination Figure 3 and Figure 4 In a preferred case, the shell 1 comprises a first shell 11 and a second shell 12, the first shell 11 is formed with a containing groove 11a, the reset spring 5 is arranged in the containing groove 11a, the diameter of the third side plate 27 is greater than the diameter of the containing groove 11a, and the third side plate 27 is located at the top end of the containing groove 11a. Through such a setting, the diameter of the third side plate 27 is greater than the diameter of the containing groove 11a, which can ensure the installation stability of the reset spring 5, prevent it from being displaced or coming out, and ensure the reliability of the reset function.

[0048] In combination Figure 1 and Figure 3 In a preferred case, the pull wire sensor further comprises a lead part 6, the lead part 6 is detachably connected with the outlet 1a, one end of the pull wire 3 is fixed on the lead part 6, and the outlet 1a is flush with the first track 22. Through such a setting, the lead part 6 and the outlet 1a are connected through a detachable structure such as a buckle or a threaded connection, which is convenient for the storage of the lead part 6, and the horizontal position of the outlet 1a and the first track 22 is flush, which is beneficial to reduce the structural friction of the pull wire 3 and the two sides of the first track 22, avoid the wear of the pull wire 3 in the long-term use process, ensure the smoothness of the movement of the pull wire 3, and further improve the measurement accuracy and service life of the sensor.

[0049] It should be understood that the above specific embodiments of the present application are only used for illustrative or explanatory purposes of the principles of the present application, and do not constitute a limitation on the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included in the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all changes and modifications falling within the scope and boundaries of the appended claims, or the 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 core assembly (2), a pull wire (3), and a rotary encoder (4). The core assembly (2) is disposed inside the housing (1). The core assembly (2) includes a core shaft (21) and a first track (22). One end of the pull wire (3) is fixed on the core assembly (2). The pull wire (3) is layered and wound on the first track (22). The width of the first track (22) is the same as or approximately the diameter of the pull wire (3). The first track (22) is an equidistant spiral structure. The core shaft (21) is sleeved on the input shaft (41) of the rotary encoder (4). A wire outlet (1a) is formed on the housing (1). The pull wire (3) is led out along the wire outlet (1a).

2. The draw wire sensor according to claim 1, characterized in that, The core assembly (2) further includes a first side plate (23), a connecting part (24), a second side plate (25), and a second track (26). The first side plate (23) is fixedly connected to the connecting part (24), the first track (22) is sleeved on the connecting part (24), the first side plate (23) abuts against the first track (22), the second side plate (25) is fixedly connected to the second track (26), the second track (26) is sleeved on the connecting part (24), the second side plate (25) abuts against the first track (22), and the second track (26) is concentric and coaxial with the core shaft (21).

3. The draw wire sensor according to claim 2, characterized in that, The side of the connecting part (24) has a plurality of first connecting holes (24a) evenly distributed along the side of the connecting part (24). The side of the second track (26) has a plurality of second connecting holes (26a) evenly distributed along the side of the second track (26). The plurality of first connecting holes (24a) and the plurality of second connecting holes (26a) correspond one-to-one.

4. The draw wire sensor according to claim 3, characterized in that, The winding core (21) has a mounting hole (21a) and the input shaft (41) has a limiting surface (41a). A limiting pin is provided at the mounting hole (21a) and the limiting pin abuts against the limiting surface (41a) through the mounting hole (21a).

5. The draw wire sensor according to claim 4, characterized in that, The second track (26) has a first operating hole (26b) formed on its side, and the center of the first operating hole (26b) is flush with the center of the mounting hole (21a).

6. The draw wire sensor according to claim 5, characterized in that, The outer casing (1) has a second operating hole (1b) formed on its side, and the center of the second operating hole (1b) is flush with the center of the first operating hole (26b).

7. The draw wire sensor according to claim 6, characterized in that, The highest point of the second operating hole (1b) is not lower than the highest point of the second connecting hole (26a).

8. The draw wire sensor according to claim 2, characterized in that, The pull-wire sensor also includes a reset spring (5), which is connected to the core shaft (21). The core assembly (2) also includes a third side plate (27), which is connected to the second side of the second track (26). One side of the reset spring (5) abuts against the third side plate (27).

9. The draw wire sensor according to claim 8, characterized in that, The outer casing (1) includes a first casing (11) and a second casing (12). A receiving groove (11a) is formed in the first casing (11). The reset spring (5) is disposed in the receiving groove (11a). The diameter of the third side plate (27) is larger than the diameter of the receiving groove (11a). The third side plate (27) is located at the top of the receiving groove (11a).

10. The draw wire sensor according to claim 1, characterized in that, The pull-wire sensor also includes a lead wire part (6), which is detachably connected to the outlet (1a). One end of the pull wire (3) is fixed on the lead wire part (6), and the outlet (1a) is flush with the first track (22).

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