Cable bidirectional length sensing device and use method thereof

Abstract

The invention relates to the field of length measurement, in particular to a cable bidirectional length sensing device and a use method thereof. The device is provided with two groups of pressing mechanisms capable of being independently adjusted and a group of measuring mechanisms. One of the two groups of pressing mechanisms is pressed, so that the movement of the cable in one direction can be limited; and the movement of the cable in the other direction can be limited by pressing the other one of the two groups of pressing mechanisms. And one group (the other group is not compressed) of the two groups of compressing mechanisms is compressed in a targeted manner, and the sensing direction can be flexibly selected, so that the two-way length accurate sensing is realized. The sensing accuracy is further guaranteed through the spring and the gear-shaped pressing wheel with the arc-shaped groove. The device is small in size, small in number of parts, stable and reliable. Compared with the characteristic that only one-way measurement can be achieved in the prior art, two-way accurate sensing of the cable length can be achieved, the current technical blank is effectively filled up, and the cable length measuring device is simple in structure, convenient to carry and quite suitable for outdoor construction, field operation and other occasions.

Description

Technical Field

[0001] The invention relates to the field of length measurement, and in particular to a bidirectional length sensing device for a cable. Background Art

[0002] The cable length sensing device is a device used to measure and monitor the length of cables in real time. It can accurately obtain the length information of cables during use or in specific environments, providing important data support for the laying, use, and maintenance of cables. It is widely used in geological exploration, electricity, communications, construction and other fields.

[0003] The cable length sensing technology in conventional industrial production is relatively mature. For example, patent CN216613554U discloses a cable meter device that can prevent the measured cable from retreating by limiting the rotation direction of the rotating wheel, thereby ensuring the accuracy of the measurement. By setting a limit assembly and a lifting assembly, the clamping of cables of any specification can be completed quickly at one time. Patent CN117760357A sets a semicircular groove to radially limit the wire to prevent the wire from deviating, thereby preventing the wire from escaping from the measuring wheel due to deviation, thereby ensuring the measurement accuracy of the mechanism.

[0004] However, when faced with some special measurement needs, existing technologies are often unable to cope with them. Taking geological drilling detection as an example, the drilling radar needs to exchange data with the host through cables. In order to accurately determine the depth information of the radar, it is necessary to accurately sense the length of the cable released or retracted. When in order to more accurately detect a certain area, or to review and supplement the previously detected area, the radar needs to move back and forth in the hole. At this time, the cable frequently switches between the released and retracted states. Although the existing technology ensures the perception accuracy by limiting the rotation direction of the wheel, it also limits the movement direction of the cable, and can only achieve one-way detection, and cannot switch the perception direction at will according to actual needs.

[0005] In addition, in outdoor construction and field operations where portability and flexibility are extremely high, the disadvantages of traditional meter counters are obvious. Their internal structure is complicated and there are many parts, which makes the overall volume relatively large. When the operation site needs to be frequently moved, it is very difficult to carry, which greatly limits their application scope and cannot effectively meet the operators' needs for convenient and efficient measurement tools.

[0006] In view of the above situation, it is urgent to design a length sensing device that can perform bidirectional precise measurement and has the characteristics of simple structure, small size, and easy to carry. This will effectively fill the current technological gap and meet more diverse practical application needs. Summary of the invention

[0007] In order to solve the above problems, the present invention adopts the following technical solutions: A bidirectional cable length sensing device, comprising two sets of independently adjustable clamping mechanisms and one set of measuring mechanisms; the clamping mechanisms are used to ensure that the cable moves in only one direction to prevent the cable from retreating during measurement, thereby affecting the accuracy of length sensing; the measuring mechanisms are used to accurately sense the displacement length of the cable; By adjusting one of the two sets of clamping mechanisms to enter a clamping state, it is ensured that the cable can only move from right to left (or from left to right), and by adjusting the other set of the two sets of clamping mechanisms to enter a clamping state, it is ensured that the cable can only move from left to right (or from right to left); According to the actual measurement direction requirements, the two groups of clamping mechanisms are adjusted in a targeted manner so that one group enters a clamping state and the other group is in a non-clamping state; in this way, the sensing direction can be flexibly selected to achieve accurate bidirectional length sensing of the cable.

[0008] Furthermore, the cable bidirectional length sensing device comprises a box body, a box cover, a coding part, a movable pressing part, a fixed pressing part and a measuring part; The movable pressing part and the fixed pressing part are used to press the cable to ensure the accuracy of measurement; the measuring part converts the linear motion of the cable into rotation information, and transmits the rotation information to the encoding part; the encoding part calculates the displacement length of the cable according to the rotation information and displays the result; The movable clamping part can move up and down relative to the box body, and the movable clamping part includes three independently movable and structurally similar clamping mechanisms, namely: a first clamping mechanism, a second clamping mechanism, and a third clamping mechanism; the fixed clamping part is fixed relative to the box body, and includes two independent clamping parts, namely: a first fixed clamping part and a second fixed clamping part; The first clamping mechanism, the second clamping mechanism, the third clamping mechanism, the first fixed clamping portion and the second fixed clamping portion are all provided with clamping wheels, and the two clamping wheels cooperate with each other to clamp the cable; The first pressing wheel built into the first pressing mechanism can only rotate clockwise, and the second pressing wheel on the first fixed pressing part matched therewith can only rotate counterclockwise; the third pressing wheel built into the second pressing mechanism can rotate bidirectionally, and the measuring wheel of the measuring part matched therewith can also rotate bidirectionally; the fourth pressing wheel built into the third pressing mechanism can only rotate counterclockwise, and the fifth pressing wheel on the second fixed pressing part matched therewith can only rotate clockwise; The first clamping mechanism and the second clamping mechanism are specifically adjusted to be close to the first fixed clamping part and the measuring part respectively, to clamp the cable (at the same time, the third clamping mechanism is adjusted to be away from the second fixed clamping part), and the device can accurately sense the displacement length of the cable when it moves from right to left; The second clamping mechanism and the third clamping mechanism are adjusted in a targeted manner so as to be close to the measuring part and the second fixed clamping part respectively, so as to clamp the cable (at the same time, the first clamping mechanism is adjusted so as to be away from the first fixed clamping part). At this time, the device can accurately sense the displacement length of the cable when it moves from left to right.

[0009] Further, the first clamping mechanism also includes a first knob, an H-beam, a spring, a clamping wheel mounting seat and a clamping wheel mounting shaft; The cross section of the clamping wheel mounting seat is an inverted "U" shape, the interior of which is used to accommodate the first clamping wheel, and two cylindrical guide rods are provided on the upper side thereof; the guide rods can be accommodated and fitted into the corresponding circular holes on the upper side of the box body; under the action of the two guide rods, the clamping wheel mounting seat can move up and down relative to the box body; The first knob is provided with threads in the circumference, and the threads can be matched with the corresponding screw holes on the upper side of the box body; the lower end of the first knob is connected to the H-shaped beam, and the connection is specifically as follows: the first knob has only one degree of freedom of rotation around its own axis relative to the H-shaped beam; tightening the first knob can reduce the distance between the first clamping wheel and the second clamping wheel, so that the two clamping wheels are closely attached to the cable, thereby achieving effective clamping of the cable; loosening the first knob can increase the distance between the first clamping wheel and the second clamping wheel, so that the two clamping wheels are out of contact with the cable, thereby releasing the clamping state; The spring is located outside the guide rod, with one end of the spring fixed to the bottom of the H-beam and the other end fixed to the upper side of the pressure wheel mounting seat; the spring can drive the first pressure wheel to press the cable onto the second pressure wheel to avoid slipping during the measurement process, so as to ensure the accuracy of length perception.

[0010] Furthermore, the first fixed clamping part, the measuring part and the second fixed clamping part are located at the same horizontal height; the first clamping mechanism, the second clamping mechanism and the third clamping mechanism are respectively located directly above the first fixed clamping part, the measuring part and the second fixed clamping part.

[0011] Furthermore, the second knob in the second clamping mechanism can be rotated to control whether the third clamping wheel and the measuring wheel clamp the cable; the third knob in the third clamping mechanism can be rotated to control whether the fourth clamping wheel and the fifth clamping wheel clamp the cable.

[0012] Furthermore, the first clamping mechanism, the third clamping mechanism, the first fixed clamping portion and the second fixed clamping portion all realize the one-way rotation function of the corresponding clamping wheel through a one-way bearing.

[0013] Furthermore, the measuring part also includes a measuring shaft; the measuring wheel is fixedly connected to the measuring shaft; the end of the measuring shaft is connected to the encoding part; the encoding part collects the rotation information of the measuring wheel through the measuring shaft, and then outputs the length perception result.

[0014] Furthermore, the first clamping wheel, the second clamping wheel, the third clamping wheel, the fourth clamping wheel, the fifth clamping wheel and the measuring wheel are all gear-like structures, and they are all circumferentially provided with arc-shaped grooves for accommodating the cable; wherein the gear-like structure can increase friction and improve length perception accuracy; the arc-shaped groove can provide precise positioning and guidance for the cable, ensuring that it moves along a specific path during the measurement process to prevent deviation or offset.

[0015] A method for using the above-mentioned cable bidirectional length sensing device, the specific steps are as follows: S1. Fixing the cable bidirectional length sensing device; S2, rotating the first knob, the second knob and the third knob to correspondingly increase the distance between the first pressing wheel and the second pressing wheel, the distance between the third pressing wheel and the measuring wheel, and the distance between the fourth pressing wheel and the fifth pressing wheel; S3, passing the cable through the cable bidirectional length sensing device; S4, tightening the second knob so that the third pressing wheel presses the cable onto the measuring wheel; S5, tighten the first knob so that the first clamping wheel presses the cable onto the second clamping wheel; at the same time, loosen the third knob so that the fourth clamping wheel and the fifth clamping wheel do not participate in the clamping of the cable; at this time, the device can accurately sense the displacement length of the cable when it moves from right to left; S6. Tighten the third knob so that the fourth clamping wheel presses the cable onto the fifth clamping wheel; at the same time, loosen the first knob so that the first clamping wheel and the second clamping wheel do not participate in the clamping of the cable; at this time, the device can accurately sense the displacement length of the cable when it moves from left to right.

[0016] The beneficial effects of the present invention are mainly: ① Compared with the unidirectional measurement characteristics of the prior art, the present invention can realize bidirectional precise perception of cable length, effectively filling the current technical gap. The present invention is equipped with three independently movable clamping mechanisms and two independent fixed clamping parts, and the built-in clamping wheels thereof have different rotatable directions. Specifically, the first clamping wheel and the fifth clamping wheel can only rotate clockwise, the second clamping wheel and the fourth clamping wheel can only rotate counterclockwise, and the third clamping wheel and the measuring wheel can rotate bidirectionally. Among them, the unidirectional rotating clamping wheel can prevent the cable from retreating and improve the measurement accuracy. By pressing down the first clamping mechanism and the second clamping mechanism, the device can accurately sense the displacement length of the cable when it moves from right to left; by pressing down the third clamping mechanism and the second clamping mechanism, the device can accurately sense the displacement length of the cable when it moves from left to right.

[0017] ② The present invention has high measurement accuracy. First, in the movable clamping part of the length sensing device, a spring and other parts are arranged between the clamping wheel mounting seat and the knob. The spring drives the clamping wheel to press the cable onto the measuring wheel to prevent slipping between the clamping wheel and the measuring wheel, so as to ensure measurement accuracy; secondly, the clamping wheel and the measuring wheel in the device are both gear-shaped structures, which can increase friction and effectively improve measurement accuracy; furthermore, arc grooves are arranged around the clamping wheel and the measuring wheel, which can provide precise positioning and guidance for the cable, ensure that it moves along a specific path during the measurement process, prevent deviation or offset, and further improve measurement accuracy.

[0018] ③ The present invention has a simple structure, a small size and is easy to carry. The length sensing device is composed of a box body, a box cover, a coding part, a movable clamping part, a fixed clamping part and a measuring part. Each part has a simple structure, a small number of parts, a small size and is easy to carry. The core components of the device, such as the measuring part and the clamping part, are located in the accommodation space formed by the box body and the box cover. It is stable and reliable and is very suitable for outdoor construction, field operations and other occasions.

[0019] ④ The present invention can be used for different wire diameters within a certain range. The length sensing device can adjust the distance between the active pressing part and the measuring part through a knob, and can be used for different wire diameters within a certain range, with a wide range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the overall appearance of a bidirectional cable length sensing device according to an embodiment of the present invention; Figure 2Schematic diagram of the internal structure of the bidirectional cable length sensing device in an embodiment of the present invention; Figure 3 A schematic diagram of another perspective of the internal structure of the bidirectional cable length sensing device in an embodiment of the present invention; Figure 4 It is a structural schematic diagram of the first pressing mechanism in an embodiment of the present invention; Figure 5 It is a structural schematic diagram of a box body in an embodiment of the present invention; Figure 6 It is a structural schematic diagram of another perspective of the bidirectional cable length sensing device in an embodiment of the present invention; Figure 7 Schematic diagram of the internal structure of the length sensing device when the cable moves from right to left in an embodiment of the present invention; Figure 8 Schematic diagram of the internal structure of the length sensing device when the cable moves from left to right in an embodiment of the present invention.

[0022] In the figure: 1-box body; 2-box cover; 3-coding part; 4-movable clamping part; 5-fixed clamping part; 6-measuring part; 7-cable; 41-first clamping mechanism; 42-second clamping mechanism; 43-third clamping mechanism; 51-first fixed clamping part; 52-second fixed clamping part; 411-first clamping wheel; 511-second clamping wheel; 421-third clamping wheel; 431-fourth clamping wheel; 521-fifth clamping wheel; 412-first knob; 422-second knob; 432-third knob; 601-measuring wheel; 602-measuring shaft; 413-H-beam; 414-spring; 415-clamping wheel mounting seat; 416-clamping wheel mounting shaft; 1001-round hole; 1002-screw hole; 4151-guide rod. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings; it should be noted that the directions or positional relationships indicated by terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention; in addition, the terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] This embodiment provides a bidirectional cable length sensing device, which has two sets of independently adjustable clamping mechanisms and one set of measuring mechanisms; the clamping mechanism is used to ensure that the cable 7 moves in only one direction to prevent the cable 7 from retreating during measurement, which affects the accuracy of length sensing; the measuring mechanism is used to accurately sense the displacement length of the cable 7; By adjusting one of the two sets of clamping mechanisms to enter a clamping state, it is ensured that the cable 7 can only move from right to left (or from left to right), and by adjusting the other set of the two sets of clamping mechanisms to enter a clamping state, it is ensured that the cable 7 can only move from left to right (or from right to left); According to the actual measurement direction requirements, the two groups of clamping mechanisms are adjusted in a targeted manner so that one group enters a clamping state and the other group is in a non-clamping state; in this way, the sensing direction can be flexibly selected to achieve accurate bidirectional length sensing of the cable 7.

[0025] like Figure 1 and Figure 2 As shown, in an optional solution of this embodiment, the length sensing device is composed of a box body 1, a box cover 2, a coding part 3, a movable pressing part 4, a fixed pressing part 5 and a measuring part 6.

[0026] like Figure 3 As shown, in this embodiment, the movable clamping part 4 can move up and down relative to the box body 1, and it includes three independently movable and similarly structured clamping mechanisms, namely: a first clamping mechanism 41, a second clamping mechanism 42, and a third clamping mechanism 43; the fixed clamping part 5 is fixed relative to the box body 1, and includes two independent clamping parts, namely a first fixed clamping part 51 and a second fixed clamping part 52. In terms of spatial position, the first fixed clamping part 51, the measuring part 6, and the second fixed clamping part 52 are located at the same horizontal height, and the first clamping mechanism 41, the second clamping mechanism 42, and the third clamping mechanism 43 are located directly above the first fixed clamping part 51, the measuring part 6, and the second fixed clamping part 52, respectively.

[0027] like Figure 3As shown, in this embodiment, the first clamping mechanism 41, the second clamping mechanism 42, the third clamping mechanism 43, the first fixed clamping portion 51 and the second fixed clamping portion 52 are all provided with clamping wheels, and the two clamping wheels cooperate with each other to clamp the cable 7. The first clamping wheel 411 built into the first clamping mechanism 41 can only rotate clockwise, and the second clamping wheel 511 on the first fixed clamping portion 51 matched therewith can only rotate counterclockwise; the third clamping wheel 421 built into the second clamping mechanism 42 can rotate bidirectionally, and the measuring wheel 601 of the measuring portion 6 matched therewith can also rotate bidirectionally; the fourth clamping wheel 431 built into the third clamping mechanism 43 can only rotate counterclockwise, and the fifth clamping wheel 521 on the second fixed clamping portion 52 matched therewith can only rotate clockwise.

[0028] It should be pointed out that the one-way rotation of the clamping wheel can be achieved by installing a one-way bearing on its rotating shaft, and can also be achieved by providing a ratchet, an overrunning clutch, a backstop and other mechanisms.

[0029] like Figure 4 As shown, the first clamping mechanism 41 also includes a first knob 412, an H-beam 413, a spring 414, a clamping wheel mounting seat 415 and a clamping wheel mounting shaft 416. The clamping wheel mounting seat 415 has an inverted "U"-shaped cross section, and its interior is used to accommodate the first clamping wheel 411. Two cylindrical guide rods 4151 are provided on its upper side. The guide rods 4151 can accommodate and fit into the first clamping wheel 411. Figure 5 In the circular hole 1001 corresponding to the upper side of the box body 1 shown, under the action of the two guide rods 4151 , the pressure wheel mounting seat 415 can move up and down relative to the box body 1 .

[0030] The first knob 412 is provided with threads around its periphery, and the threads can be matched to Figure 5 The screw hole 1002 corresponding to the upper side of the box body 1 is shown; the lower end of the first knob 412 is connected to the H-beam 413, and the connection is specifically manifested as: the first knob 412 has only one degree of freedom of rotation around its own axis relative to the H-beam 413. Therefore, the distance between the first clamping wheel 411 and the second clamping wheel 511 can be reduced by tightening the first knob 412, so that the two clamping wheels are closely attached to the cable 7, and the cable is effectively clamped; the distance between the first clamping wheel 411 and the second clamping wheel 511 can be increased by loosening the first knob 412, so that the two clamping wheels are out of contact with the cable 7, and the clamping state is released.

[0031] Similarly, the second knob 422 in the second clamping mechanism 42 can be rotated to control whether the third clamping wheel 421 and the measuring wheel 601 clamp the cable 7 , and the third knob 432 in the third clamping mechanism 43 can be rotated to control whether the fourth clamping wheel 431 and the fifth clamping wheel 521 clamp the cable 7 .

[0032] The spring 414 in the first clamping mechanism 41 is located outside the guide rod 4151, with one end surface fixed to the bottom of the H-beam 413 and the other end surface fixed to the upper side of the clamping wheel mounting seat 415. The spring 414 drives the first clamping wheel 411 to press the cable 7 onto the second clamping wheel 511 to prevent slipping during the measurement process, thereby ensuring measurement accuracy.

[0033] like Figure 6 As shown, the first clamping wheel 411, the second clamping wheel 511, the third clamping wheel 421, the fourth clamping wheel 431, the fifth clamping wheel 521 and the measuring wheel 601 are all gear-shaped structures, which can increase friction and effectively improve measurement accuracy. In addition, the circumference of these wheels is provided with arc grooves with a diameter slightly larger than the wire diameter of the cable 7, which can provide accurate positioning and guidance for the cable 7, ensure that it moves along a specific path during the measurement process, prevent deviation or offset, and further improve measurement accuracy.

[0034] This embodiment also provides a method for using the above-mentioned cable bidirectional length sensing device, and the specific steps are as follows: S1. Fixing the cable bidirectional length sensing device; S2, rotate the first knob 412, the second knob 422 and the third knob 432 to correspondingly increase the distance between the first pressing wheel 411 and the second pressing wheel 511, the distance between the third pressing wheel 421 and the measuring wheel 601, and the distance between the fourth pressing wheel 431 and the fifth pressing wheel 521; S3, passing the cable 7 through the cable bidirectional length sensing device; S4, tighten the second knob 422, so that the third pressing wheel 421 presses the cable 7 onto the measuring wheel 601; S5, such as Figure 7 As shown, tighten the first knob 412 so that the first pressing wheel 411 presses the cable 7 onto the second pressing wheel 511; at the same time, loosen the third knob 432 so that the fourth pressing wheel 431 and the fifth pressing wheel 521 do not participate in the pressing of the cable 7; at this time, the device can realize accurate perception of the moving length of the cable 7 from right to left; S6, such as Figure 8 As shown, tighten the third knob 432 so that the fourth clamping wheel 431 presses the cable 7 onto the fifth clamping wheel 521; at the same time, loosen the first knob 412 so that the first clamping wheel 411 and the second clamping wheel 511 do not participate in the clamping of the cable 7; at this time, the device can realize accurate perception of the length of the cable 7 moving from left to right.

[0035] The above detailed description is a specific description of a feasible embodiment of the present invention. The embodiment is not intended to limit the patent scope of the present invention. Any equivalent implementation or modification that does not deviate from the present invention should be included in the patent scope of this case.

Claims

1. A bidirectional cable length sensing device, characterized in that: It has two sets of independently adjustable clamping mechanisms and one set of measuring mechanisms; the clamping mechanisms are used to ensure that the cable (7) moves only in a single direction, so as to prevent the cable (7) from retreating during measurement, thereby affecting the accuracy of length perception; the measuring mechanisms are used to accurately sense the displacement length of the cable (7); By adjusting one of the two sets of clamping mechanisms to enter a clamping state, it is ensured that the cable (7) can only move from right to left (or from left to right); by adjusting the other set of the two sets of clamping mechanisms to enter a clamping state, it is ensured that the cable (7) can only move from left to right (or from right to left); According to actual measurement direction requirements, the two groups of clamping mechanisms are adjusted in a targeted manner so that one group enters a clamping state and the other group is in a non-clamping state; in this way, the sensing direction can be flexibly selected, thereby achieving accurate bidirectional length sensing of the cable (7).

2. The cable bidirectional length sensing device according to claim 1, characterized in that: It comprises a box body (1), a box cover (2), a coding part (3), a movable pressing part (4), a fixed pressing part (5) and a measuring part (6); The movable pressing part (4) and the fixed pressing part (5) are used to press the cable (7) to ensure the accuracy of the measurement; the measuring part (6) converts the linear motion of the cable (7) into rotation information, and transmits the rotation information to the encoding part (3); the encoding part (3) calculates the displacement length of the cable (7) according to the rotation information, and displays the result; The movable clamping portion (4) is movable up and down relative to the box body (1), and the movable clamping portion (4) comprises three independently movable and structurally similar clamping mechanisms, namely: a first clamping mechanism (41), a second clamping mechanism (42) and a third clamping mechanism (43); the fixed clamping portion (5) is fixed relative to the box body (1), and comprises two independent clamping portions, namely: a first fixed clamping portion (51) and a second fixed clamping portion (52); The first pressing mechanism (41), the second pressing mechanism (42), the third pressing mechanism (43), the first fixed pressing portion (51) and the second fixed pressing portion (52) are all provided with pressing wheels, and the two pressing wheels cooperate with each other to press the cable (7); The first pressing wheel (411) built into the first pressing mechanism (41) can only rotate clockwise, and the second pressing wheel (511) on the first fixed pressing part (51) matched therewith can only rotate counterclockwise; the third pressing wheel (421) built into the second pressing mechanism (42) can rotate bidirectionally, and the measuring wheel (601) of the measuring part (6) matched therewith can also rotate bidirectionally; the fourth pressing wheel (431) built into the third pressing mechanism (43) can only rotate counterclockwise, and the fifth pressing wheel (521) on the second fixed pressing part (52) matched therewith can only rotate clockwise; The first pressing mechanism (41) and the second pressing mechanism (42) are adjusted in a targeted manner so as to be close to the first fixed pressing portion (51) and the measuring portion (6) respectively, thereby pressing the cable (7) (at the same time, the third pressing mechanism (43) is adjusted so as to be away from the second fixed pressing portion (52)). At this time, the device can accurately sense the displacement length of the cable (7) when it moves from right to left; The second clamping mechanism (42) and the third clamping mechanism (43) are adjusted in a targeted manner so as to be close to the measuring portion (6) and the second fixed clamping portion (52) respectively, thereby clamping the cable (7) (at the same time, the first clamping mechanism (41) is adjusted so as to be away from the first fixed clamping portion (51)). At this time, the device can accurately sense the displacement length of the cable (7) when it moves from left to right.

3. The cable bidirectional length sensing device according to claim 2, characterized in that: The first pressing mechanism (41) further comprises a first knob (412), an H-shaped beam (413), a spring (414), a pressing wheel mounting seat (415), and a pressing wheel mounting shaft (416); The cross section of the pressure wheel mounting seat (415) is an inverted "U" shape, and its interior is used to accommodate the first pressure wheel (411). Two cylindrical guide rods (4151) are provided on its upper side; the guide rods (4151) can be accommodated and fitted into corresponding circular holes (1001) on the upper side of the box body (1); under the action of the two guide rods (4151), the pressure wheel mounting seat (415) can move up and down relative to the box body (1); The first knob (412) is provided with a thread in the circumferential direction, and the thread can be fitted into the corresponding screw hole (1002) on the upper side of the box body (1); the lower end of the first knob (412) is connected to the H-shaped beam (413), and the connection is specifically as follows: the first knob (412) has only one degree of freedom of rotation around its own axis relative to the H-shaped beam (413); tightening the first knob (412) can reduce the distance between the first clamping wheel (411) and the second clamping wheel (511), so that the two clamping wheels are closely attached to the cable (7), thereby effectively clamping the cable (7); loosening the first knob (412) can increase the distance between the first clamping wheel (411) and the second clamping wheel (511), so that the two clamping wheels are out of contact with the cable (7), thereby releasing the clamping state; The spring (414) is located outside the guide rod (4151), with one end of the spring being fixed to the bottom of the H-beam (413) and the other end being fixed to the upper side of the pressure wheel mounting seat (415); the spring (414) can drive the first pressure wheel (411) to press the cable (7) onto the second pressure wheel (511), thereby avoiding slippage during the measurement process and ensuring the accuracy of length perception.

4. The cable bidirectional length sensing device according to claim 2, characterized in that: The first fixed clamping portion (51), the measuring portion (6) and the second fixed clamping portion (52) are located at the same horizontal height; the first clamping mechanism (41), the second clamping mechanism (42) and the third clamping mechanism (43) are located directly above the first fixed clamping portion (51), the measuring portion (6) and the second fixed clamping portion (52), respectively.

5. The cable bidirectional length sensing device according to claim 3, characterized in that: Whether the third pressing wheel (421) and the measuring wheel (601) press the cable (7) can be controlled by rotating the second knob (422) in the second pressing mechanism (42); whether the fourth pressing wheel (431) and the fifth pressing wheel (521) press the cable (7) can be controlled by rotating the third knob (432) in the third pressing mechanism (43).

6. The cable bidirectional length sensing device according to claim 2, characterized in that: The first pressing mechanism (41), the third pressing mechanism (43), the first fixed pressing portion (51) and the second fixed pressing portion (52) all realize the function of one-way rotation of the corresponding pressing wheel through a one-way bearing.

7. The cable bidirectional length sensing device according to claim 2, characterized in that: The measuring part (6) further comprises a measuring shaft (602); the measuring wheel (601) is fixedly connected to the measuring shaft (602); an end of the measuring shaft (602) is connected to the encoding part (3); the encoding part (3) collects rotation information of the measuring wheel (601) through the measuring shaft (602), and then outputs a length perception result.

8. The cable bidirectional length sensing device according to claim 2, characterized in that: The first clamping wheel (411), the second clamping wheel (511), the third clamping wheel (421), the fourth clamping wheel (431), the fifth clamping wheel (521) and the measuring wheel (601) are all gear-shaped structures, and are all provided with arc-shaped grooves in their circumferences for accommodating the cable (7); wherein the gear-shaped structure can increase friction and improve the length perception accuracy; and the arc-shaped groove can provide precise positioning and guidance for the cable (7), ensuring that it moves along a specific path during the measurement process, thereby preventing deviation or offset.

9. A method for using a bidirectional cable length sensing device, using the bidirectional cable length sensing device as claimed in any one of claims 1 to 8, characterized in that: The specific steps are as follows: S1. Fixing the cable bidirectional length sensing device; S2, rotating the first knob (412), the second knob (422) and the third knob (432) to correspondingly increase the distance between the first pressing wheel (411) and the second pressing wheel (511), the distance between the third pressing wheel (421) and the measuring wheel (601), and the distance between the fourth pressing wheel (431) and the fifth pressing wheel (521); S3, passing the cable (7) through the cable bidirectional length sensing device; S4, tightening the second knob (422) so that the third pressing wheel (421) presses the cable (7) onto the measuring wheel (601); S5, tightening the first knob (412) so that the first clamping wheel (411) presses the cable (7) onto the second clamping wheel (511); at the same time, loosening the third knob (432) so that the fourth clamping wheel (431) and the fifth clamping wheel (521) do not participate in the clamping of the cable (7); at this time, the device can accurately sense the displacement length of the cable (7) when it moves from right to left; S6. Tighten the third knob (432) so that the fourth clamping wheel (431) presses the cable (7) onto the fifth clamping wheel (521); at the same time, loosen the first knob (412) so that the first clamping wheel (411) and the second clamping wheel (511) do not participate in the clamping of the cable (7); at this time, the device can accurately sense the displacement length of the cable (7) when it moves from left to right.

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