Shafting structure of pull rope sensor

Abstract

The utility model relates to a shafting structure of a pull rope sensor, which is used for realizing stable transmission of a winding wheel, and comprises a first shaft transmission device, a second shaft transmission device, a third shaft transmission device and a fourth shaft transmission device, and the first shaft transmission device is used for realizing stable transmission between the winding wheel and a coil spring and comprises a coil shaft sleeved outside a hollow shaft of a coil spring bin cover; and the second shaft transmission device is used for realizing stable transmission between the coiling wheel and the electronic component and comprises a worm shaft inserted into the hollow shaft of the coil spring bin cover. Compared with the prior art, the winding device has the advantages of small operation swing, good winding consistency, convenience in installation and the like.

Description

Technical Field

[0001] The utility model relates to the field of intelligent sensor manufacturing, in particular to a shafting structure of a draw-wire sensor. Background Art

[0002] A draw-wire sensor belongs to a kind of length sensor, also known as a displacement sensor, a draw-wire sensor, or a draw-wire electronic ruler, which is used to accurately measure linear position, and the measuring range varies from several hundred millimeters to more than ten meters.

[0003] A draw-wire sensor usually consists of a housing, a spiral spring, a wire reel, a length-measuring steel wire rope, and a length-measuring electronic unit. Usually, a bearing is arranged on a rotating shaft and installed on the housing, and the rotating shaft is directly connected to the wire reel through a setscrew, a pin, or a key drive. When the length-measuring wire is pulled to drive the rotating shaft to rotate, the length-measuring electronic unit in the sensor senses the rotation of the rotating shaft, and the length of the pulled-out length-measuring wire is obtained through calculation. When the length-measuring steel wire rope is retracted, the spiral spring force is transmitted to the wire reel through the rotating shaft, and the wire reel is driven to rotate reversely by using elasticity, so as to retract the steel wire rope. To ensure the measurement accuracy and length measurement consistency, it is required that when the length-measuring wire is pulled out the same length each time, the corresponding rotation angle of the wire reel, that is, the rotating shaft, should be the same, which requires good winding.

[0004] However, when it is necessary to measure the height of a higher crane boom or other mechanical heights, the draw-wire sensor needs to use a longer cable, which makes the diameter of the wire reel increase and the winding increase, the overall mass and moment of inertia increase, which brings pressure to the connection and transmission between the wire reel and the rotating shaft, and also increases the swing of the wire reel during operation. In addition, due to reasons such as the jitter of the crane boom in actual working conditions, the swing will be further aggravated. Therefore, the swing of the existing shafting structure wire reel during operation is very obvious, which affects the winding effect. Content of the Utility Model

[0005] To solve the technical problems in the background art, the utility model provides a shafting structure of a draw-wire sensor with good winding effect and stable structure, so as to realize the stable transmission of the wire reel. The shafting structure of the draw-wire sensor includes:

[0006] A first shaft transmission device: used to realize the stable transmission between the wire reel and the spiral spring, including a wire winding shaft sleeved outside the hollow shaft of the spiral spring cover.

[0007] A second shaft transmission device: used to realize the stable transmission between the wire reel and the electronic components, including a worm shaft inserted into the hollow shaft of the spiral spring cover.

[0008] Further, the hollow shaft is installed or integrally formed at the center of the spiral spring cover, and its length is less than that of the worm shaft and greater than that of the wire winding shaft.

[0009] Furthermore, the coil spring is arranged in a coil spring bin formed by buckling the coil spring bin cover and the pull rope sensor housing, and its inner hook is hooked and installed on the upper part of the winding shaft extending into the coil spring bin, and its outer hook is hooked and installed on the inner wall of the coil spring bin cover.

[0010] Furthermore, the winding shaft is in the shape of a stepped shaft, with a stepped terrace-shaped cavity provided inside, and a first transmission accessory is installed in the space between the stepped terrace-shaped cavity and the hollow shaft, and a second transmission accessory is installed in the space between the winding shaft shoulder and the rope sensor housing.

[0011] Furthermore, the worm shaft is hollow, a long flat portion is provided at its lower end, and the upper end is transmission-connected to the electronic component via a worm gear.

[0012] Furthermore, the upper part of the long flat part of the worm shaft is fixedly connected to the flat hole in the center of the winding wheel on which the length measuring cable is wound, and the lower part of the long flat part is tightened by a nut or transmission-connected to an external cable arrangement mechanism by a pin.

[0013] Furthermore, the electronic component is arranged in an electronic compartment formed by an electronic compartment cover buckled on a coil spring compartment cover, and the electronic component includes a PCB board, a processor chip and a magnetic induction chip arranged on the PCB board, and a magnet installed at one end of the worm gear and arranged relative to the magnetic induction chip.

[0014] Furthermore, a conductive slip ring is provided at the upper end of the worm shaft, one end of the conductive slip ring is connected to the PCB board, the inner end of the length measuring cable is fixed to the winding wheel and then passes through the wire hole of the winding wheel, and then extends into the hollow cavity of the worm shaft and is connected to the other end of the conductive slip ring, and a pull ring and a signal terminal are provided at the outer end of the length measuring cable, and the signal terminal is used to connect to an external limit switch and then transmit the limit switch signal to the processor chip on the PCB board through the length measuring cable.

[0015] Furthermore, the assembly steps of the shafting structure include:

[0016] Place the winding shaft forward on the fixture and fix it, then install the third bearing on the shaft shoulder;

[0017] Install the housing onto the winding shaft, place the coil spring into the housing, hook the inner hook of the coil spring with the groove on the winding shaft, and hook the outer hook of the coil spring with the protrusion on the housing for initial positioning;

[0018] Snap the spring barrel cover onto the housing, pass the hollow shaft downward through the spool, adjust the relative position of the spring barrel cover and the housing, and hook the outer hook of the spring onto the protrusion on the spring barrel cover. After repositioning, use screws to connect the spring barrel cover and the housing, and press-fit a first bearing, a bushing, and a second bearing in sequence between the inner wall of the stepped cavity of the spool and the outer wall of the hollow shaft of the spring barrel cover, and then install a shaft retaining ring for sealing;

[0019] The worm shaft passes downward through the hollow shaft of the spring barrel cover, and a oil-free bushing is press-fitted between the lower end of the hollow shaft and the worm shaft, and a retaining ring is installed at the lower end of the worm shaft;

[0020] Install the spool. After inversion, use screws to lock the spool to the spool shaft, so that the flat hole in the center of the spool is connected to the long flat position at the lower end of the worm shaft. Finally, install a worm gear and worm at the upper end of the worm shaft, and install an electronic component on the upper surface of the spring barrel cover, then fasten it with an electronic cover, and perform lubrication and sealing treatment to complete the assembly of the shafting structure.

[0021] Further, the steps for applying the cable pull sensor with this shafting structure to a boom lift for monitoring are as follows:

[0022] The cable pull sensor is fixed on the main boom of the boom lift. Connect the pull ring at the outer end of the measuring cable to the telescopic boom to be measured. When the telescopic boom makes a telescopic movement, it drives the measuring cable to stretch and retract, thereby driving the spool to rotate. During the rotation of the spool, the spring is wound and unwound by the first shaft transmission device, and at the same time, the worm gear and worm are driven to rotate by the second shaft transmission device. When the worm gear and worm rotate, the magnet is driven to rotate. The magnetic induction chip detects the rotation angle by detecting the change in the magnetic field, and the processor chip on the PCB board performs conversion to obtain the final length, and outputs it to the vehicle-mounted controller through the wiring port;

[0023] For the case where stroke limit is required, use the measuring cable as the transmission line for the limit switch signal. After fixing the limit switch, connect the output end of the limit switch to the signal terminal at the outer end of the measuring cable, and the other end of the measuring cable is connected to the processor chip on the PCB board through a conductive slip ring. When the telescopic length of the telescopic boom to be measured triggers the limit switch, the processor chip receives the switch signal of the limit switch and then sends it to the vehicle-mounted controller for alarm or emergency stop.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. Good wire winding consistency and high precision

[0026] Compared with the existing rope sensor shaft system structure that adopts the method of directly attaching the winding wheel to the rotating shaft, the two sub-shaft system structures of the utility model adopt a separate design. The first shaft transmission device and the second shaft transmission device are spatially separated by a fixed hollow shaft. The winding wheel and the winding spring are smoothly transmitted through the first shaft transmission device, and the winding wheel and the worm gear and the electronic components are smoothly transmitted through the second shaft transmission device. At the same time, since the hollow shaft has a certain length, the rotation of the winding shaft and the worm shaft can be limited at the same time, which effectively prevents relative shaking during rotation, ensures the stable transmission of the winding spring force and the worm shaft force, and effectively improves the winding consistency.

[0027] 2. Easy installation and ingenious structure

[0028] The two sub-shaft structures of the utility model are installed by plugging and sleeve connection during design. During assembly, the limiting effect of the hollow shaft, retaining ring and bearing can ensure the installation accuracy. At the same time, the simple coordination of the components is also convenient for assembly, thereby improving the assembly efficiency.

[0029] 3. Easy to expand

[0030] The utility model reserves a flat position and a pin hole for connecting an external wiring arrangement device at the lower end of the worm shaft, which can expand the functions. When the external wiring arrangement device is used in conjunction with the shaft system structure for winding, the winding consistency can be further improved, the measurement accuracy can be improved, and the measurement accuracy can reach 0.4%.

[0031] 4. Adapt limit switch working conditions

[0032] The utility model adopts a hollow worm shaft, cooperates with a conductive slip ring and a length measuring cable, and sends the signal of the limit switch to the processor chip on the PCB board through the signal terminal to realize operations such as alarm and emergency stop, and cleverly utilizes the performance of the length measuring cable that can transmit electrical signals to adapt to the working conditions of the limit switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a front sectional view of the structure of the utility model.

[0034] Figure 2 It is a schematic diagram of the structure of the coil spring compartment cover.

[0035] Figure 3 It is a schematic diagram of the structure of the winding shaft.

[0036] Figure 4 Schematic diagram of the structure of the worm shaft.

[0037] Figure 5 This is a schematic diagram of the structure of a draw-wire sensor with an external wiring device.

[0038] Figure 6It is a flow chart of the assembly steps of the drawstring sensor.

[0039] Description of the reference numerals:

[0040] 1. Electronic warehouse cover, 2. PCB board, 3. PCB board mounting seat, 4. Spring storage cover, 5. Third bearing, 6. Housing, 7. Wire reel, 8. Wire hole, 9. Measuring long cable, 10. Conductive slip ring, 11. Wiring port, 12. Worm and worm gear, 13. Worm shaft, 14. Fourth bearing, 15. Hollow shaft, 16. First bearing, 17. Wire winding shaft, 18. Second bearing, 19. Fastening screw, 20. Wire clamp, 21. Cable arranging shaft. Specific embodiments

[0041] The present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present utility model, and the detailed implementation manners and specific operation processes are given, but the protection scope of the present utility model is not limited to the following embodiments.

[0042] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0043] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of this utility model is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0044] The terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0045] In the description of this embodiment, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific situations.

[0046] To make the purpose, technical solution and advantages of the present utility model clearer, the embodiments of the present utility model will be further described in detail below with reference to the accompanying drawings.

[0047] Embodiment

[0048] The utility model provides a shafting structure of a pull rope sensor, which is applied to a large-range pull rope sensor to improve the winding consistency and operation stability. As Figure 1 shown, the pull rope sensor mainly consists of a pull rope sensor main body and a shafting structure. The pull rope sensor main body includes an electronic compartment cover 1, a spring barrel cover 4, a housing 6, a spring, a wire winding wheel 7, a measuring wire cable 9, a worm and worm gear 12, and electronic components, etc. The shafting structure of the pull rope sensor includes a first shaft transmission device for realizing stable transmission between the wire winding wheel 7 and the spring, and a second shaft transmission device for realizing stable transmission between the wire winding wheel 7 and the electronic components.

[0049] As Figure 2 shown, Figure 2 is a schematic structural diagram of the spring barrel cover 4. The spring barrel cover 4 includes a circular cover plate and a hollow shaft 15 installed or integrally formed at the center of the circular cover plate. The outer edge of the circular cover plate is concave inward, and is fixedly buckled to the housing 6 by screws to form a spring barrel. A spring is arranged in the spring barrel, and the outer hook of the spring is fixedly hooked to the protrusion on the inner wall of the outer edge of the spring barrel cover 4;

[0050] In order to facilitate mold opening and production, the spring barrel cover 4 of the utility model adopts a split structure. The spring barrel cover 4 includes 3 components, namely a circular cover plate, a hollow shaft 15 and a PCB board mounting seat 3. An installation groove for installing the PCB board mounting seat 3 is opened on the upper surface of the circular cover plate. The PCB board mounting seat 3 is circular and has a through hole at the center. An L-shaped extension for installing a fourth bearing 14 is provided at the upper end of the hollow shaft 15, and the L-shaped extension is fixed at the position of the center through hole of the PCB board mounting seat 3 by a protrusion.

[0051] The first shaft transmission device includes a wire winding shaft 17 sleeved outside the hollow shaft 15 of the spring barrel cover 4 and a first transmission fitting. As Figure 3 shown, the wire winding shaft 17 is in the shape of a stepped shaft as a whole, and has three levels of steps in total. A stepped cavity for placing the first transmission fitting is opened in the wire winding shaft 17, which also has three levels. The wire winding shaft 17 is sleeved outside the hollow shaft 15, and the upper first-level step is inserted into the spring barrel, and is stably transmitted by hooking the groove on it with the inner hook of the spring. The bottom surface of the third-level step of the wire winding shaft 17 is fixedly connected to the wire winding wheel 7 by a plurality of fastening screws 19 (8 in this example) to achieve stable transmission. The first transmission fitting includes a first bearing 16, a shaft sleeve, a second bearing 18, a third bearing 5 installed at the first shaft shoulder of the wire winding shaft 17, a shaft retaining ring for sealing and lubricating oil for lubrication, which are arranged in the stepped cavity in sequence. The second shaft shoulder of the wire winding shaft 17 abuts against the housing.

[0052] The second shaft transmission device includes a worm shaft 13 inserted into the hollow shaft 15 of the coil spring compartment cover 4 and a second transmission accessory, such as Figure 4 As shown, the worm shaft 13 is a hollow structure as a whole. The outer side of the upper end of the worm shaft 13 is provided with a thread for installing the worm gear 12, and a mounting hole for installing the conductive slip ring 10 is opened in the upper end of the worm shaft 13. The upper end of the worm shaft 13 with the worm gear 12 is inserted into the electronic compartment, so that the worm gear 12 and the worm shaft 13 rotate synchronously with the winding wheel 7; a groove for placing a sealing ring and a retaining ring is opened in the middle of the worm shaft 13; the lower end of the worm shaft 13 is a long flat part, after the worm shaft 13 passes through the hollow shaft 15 downward, it is first fixed to the flat part hole in the center of the winding wheel 7 through the upper flat part, and the lower flat part with the pin hole is connected to the wire arrangement shaft 21 through the pin shaft (when an external wire arrangement device is required), or directly fixed by a nut (when no external wire arrangement device is required).

[0053] The second transmission accessory includes an oil-free bushing installed between the lower end of the hollow shaft 15 and the worm shaft 13, a retaining ring installed at the lower end of the worm shaft 13, and a fourth bearing 14 arranged between the L-shaped extension portion at the upper end of the hollow shaft 15 and the worm shaft 13 (or between the spring magazine cover 4 and the worm shaft 13).

[0054] The electronic compartment cover 1 is buckled on the coil spring compartment cover 4 to form an electronic compartment. The electronic components are arranged in the electronic compartment. The electronic components include a PCB board 2, a magnet and a wiring port 11. The PCB board 2 is installed on the coil spring compartment cover 4 (or directly installed on the coil spring compartment cover 4) through a PCB board mounting seat 3, and electronic components such as a processor chip and a magnetic induction chip are provided on the PCB board 2. The magnetic induction chip communicates with the processor chip, and the processor chip communicates with an external device through a wiring port 11 arranged on the electronic compartment cover 1. The magnet is installed on the worm gear 12 and is arranged relative to the magnetic induction chip. When the worm shaft 13 drives the worm gear 12 to rotate, the magnetic field of the magnet changes. The magnetic induction chip senses the change in the magnetic field and converts it into a voltage / current signal and outputs it to the processor chip. The processor chip calculates the corresponding rotation angle based on the voltage / current signal, and then sends the rotation angle data through the wiring port 11.

[0055] In some actual working conditions, in order to communicate with an external limit switch, a conductive slip ring 10 is also provided in the mounting hole at the upper end of the worm shaft 13 to achieve electrical connection between the rotating end and the fixed end. Its fixed end is connected to the PCB board 2. The inner end of the measuring long cable 9 passes through the wire hole 8 opened on the cable reel 7 after being fixed to the cable reel 7, passes through the wire clamp 20 installed at the bottom of the cable reel 7, then penetrates into the lower end of the worm shaft 13 and is connected to the rotating end of the conductive slip ring 10. The outer end of the measuring long cable 9 is wound around the cable reel 7 and then passes through an external wire arranging device, and then a pull ring and a signal terminal are provided. The signal terminal is connected to an external limit switch, so as to realize the transmission of the switch signal sent by the limit switch to the processor chip on the PCB board 2 through the measuring long cable 9.

[0056] As Figure 6 shown, the assembly steps of the draw-wire sensor body with the shafting structure designed by the present utility model are as follows:

[0057] 1) First, place the cable reel 17 upright on the fixture and fix it, and then install the third bearing 5 on the shaft shoulder;

[0058] 2) Then install the housing 6 onto the cable reel 17, and place the coil spring into the housing 6. At this time, hook the inner hook of the coil spring with the groove on the cable reel 17, and hook the outer hook with the protrusion on the housing 6 for initial positioning;

[0059] I. For the structure of the coil spring chamber cover 4 in which the hollow shaft 15 and the circular cover are integrally formed, the following steps are carried out:

[0060] 3) Snap the coil spring chamber cover 4 onto the housing 6, so that the hollow shaft 15 passes downward through the cable reel 17. Adjust the relative position of the coil spring chamber cover 4 and the housing 6, so that the outer hook of the coil spring is hooked with the protrusion on the coil spring chamber cover 4. After repositioning is completed, connect the coil spring chamber cover 4 and the housing 6 with screws, and press a first bearing 16, a shaft sleeve and a second bearing 18 between the inner wall of the stepped cavity of the cable reel 17 and the outer wall of the hollow shaft 15 of the coil spring chamber cover 4 in sequence, and then install a shaft retaining ring for sealing. Thus, the first shaft transmission device is installed. At this time, the cable reel 17 can rotate around the hollow shaft 15 and is subject to the elastic force of the coil spring;

[0061] II. For the structure of the coil spring chamber cover 4 in which the hollow shaft 15 is fixedly installed at the center of the circular cover through the PCB board mounting seat 3, the coil spring chamber cover 4 needs to be installed first before installation, and a fourth bearing 14 is installed in the L-shaped extension at the upper end of the hollow shaft 15, and then step 3) is carried out;

[0062] 4) For the structure of the coil spring chamber cover 4 in which the hollow shaft 15 and the circular cover are integrally formed, a fourth bearing 14 is installed at the central hole on the upper surface of the coil spring chamber cover 4. For the split-type coil spring chamber cover 4 structure, the fourth bearing 14 does not need to be installed;

[0063] Pass the worm shaft 13 downward through the hollow shaft 15 of the coil spring bin cover 4, and press an oil-free bushing between the lower end of the hollow shaft 15 and the worm shaft 13, and install a retaining ring at the lower end of the worm shaft 13. At this time, the second shaft transmission device is installed, and the worm shaft 13 can rotate freely in the hollow shaft 14;

[0064] 5) Install the winding wheel 7, turn it upside down, and then use screws to lock the winding wheel 7 and the winding shaft 17, so that the flat hole in the center of the winding wheel 7 is connected to the long flat hole at the lower end of the worm shaft 13. At this time, the transmission between the two shaft systems is completed. Finally, install the worm gear 12 on the upper end of the worm shaft 13, install the electronic components on the upper surface of the spring compartment cover 4, buckle it through the electronic compartment cover 1, and perform glue sealing to complete the assembly of the sensor body 1.

[0065] Different from the existing pull-wire sensor shaft system structure, the utility model is provided with two shaft transmission devices, the winding wheel 7 and the winding shaft 17 are rigidly connected and can be regarded as one body, two bearings and axle sleeves are installed between the winding shaft 17 and the outer wall of the hollow shaft 15 of the winding spring bin cover 4 to form a first shaft transmission device, and an oil-free bushing is installed between the worm shaft 13 and the inner wall of the hollow shaft 15 of the winding spring bin cover 4 to form a second shaft transmission device;

[0066] For the first axis transmission device, the groove on the winding shaft 17 is connected to the inner hook of the coil spring, and the protrusion on the inner wall of the coil spring compartment cover 4 is connected to the outer hook of the coil spring, that is, the rotation of the winding wheel 7 is directly applied to the coil spring after being stably transmitted through the first axis transmission device. It can be seen that in the utility model, the main force of the rope pull sensor body is on the first axis transmission device. During the operation of the rope pull sensor, the winding wheel 7 is subjected to the force pulled by the rope and the elastic force of the coil spring. Compared with the transmission structure of the existing rope pull sensor, the winding wheel 7 of the utility model is not attached to the rotating shaft, but is installed on the shell 6 and the coil spring compartment cover 4 through the first axis transmission device. It can withstand a larger load, has smaller swing, is more stable and firm during operation, and can also prevent the winding from being affected by the swing of the winding wheel 7, and the length measuring cable 9 is more evenly routed when arranged.

[0067] For the second-axis transmission device, the lower end of the worm shaft 13 is connected to the winding wheel 7 through a flat position and the rotation of the winding wheel 7 is transmitted to the electronic component by means of a worm gear 12, thereby completing the transmission and transformation of the length measurement. During operation, the second-axis transmission device is only subjected to friction resistance and the transmission resistance of the worm gear 12. The force is small, and the swing (shaking) caused during rotation is also small. This directly reduces the error of the rope sensor caused by the swing of the measuring axis, which is more conducive to improving the measurement accuracy of the sensor.

[0068] Taking the application of the aerial work vehicle boom of a 20m draw rope sensor as an example, the method of using the draw rope sensor with the shaft system structure design of the utility model to measure the length is as follows:

[0069] Fix the drawstring sensor body on the main boom of the aerial work vehicle, and connect the pull ring at the end of the measuring cable 9 to the telescopic boom to be measured. When the telescopic boom makes a telescopic movement, it drives the measuring cable 9 to expand and contract, thereby driving the wire reel 7 to rotate. During the rotation of the wire reel 7, the torsion spring is wound and unwound through the first shaft transmission device. At the same time, the worm and worm gear 12 is driven to rotate through the second shaft transmission device. When the worm and worm gear 12 rotates, it drives the magnet to rotate. The magnetic encoder detects the rotation angle by detecting the change of the magnetic field, and the processor chip on the PCB board 2 calculates to obtain the final length, and outputs it to the vehicle-mounted controller of the aerial work vehicle through the wiring port 11.

[0070] In addition, for the case where stroke limit is required, the measuring cable 9 of the present invention can be used as the transmission line of the limit switch signal. After fixing the limit switch, connect the output end of the limit switch to the signal terminal of the measuring cable 9, and the other end of the measuring cable 9 is connected to the processor chip on the PCB board 2 through the conductive slip ring 10. When the telescopic length triggers the limit switch, the processor chip will receive the switch signal of the limit switch and then send it to the vehicle-mounted controller for alarm or emergency stop.

[0071] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art shall fall within the protection scope determined by the claims.

Claims

1. An axis system structure of a pull-wire sensor, characterized in that: The shafting structure includes: A first shaft transmission device is used to achieve stable transmission between the winding wheel (7) and the winding spring, and comprises a winding shaft (17) sleeved outside the hollow shaft (15) of the winding spring compartment cover (4); The second shaft transmission device is used to realize stable transmission between the winding wheel (7) and the electronic component, and comprises a worm shaft (13) inserted into the hollow shaft (15) of the winding spring compartment cover (4).

2. The shaft system structure of a pull-wire sensor according to claim 1, characterized in that: The hollow shaft (15) is installed or integrally formed at the center of the winding spring bin cover (4), and its length is shorter than the worm shaft (13) and longer than the winding shaft (17).

3. The shaft system structure of a pull-wire sensor according to claim 1, characterized in that: The coil spring is arranged in a coil spring bin formed by buckling the coil spring bin cover (4) and the pull rope sensor housing (6), and its inner hook is hooked and installed on the upper part of the winding shaft (17) extending into the coil spring bin, and its outer hook is hooked and installed on the inner wall of the coil spring bin cover (4).

4. The shaft system structure of a pull-wire sensor according to claim 3, characterized in that: The winding shaft (17) is in the shape of a stepped shaft, with a stepped terrace-shaped cavity provided inside, and a first transmission accessory is installed in the space between the stepped terrace-shaped cavity and the hollow shaft (15), and a second transmission accessory is installed in the space between the shaft shoulder of the winding shaft (17) and the rope sensor housing (6).

5. The shaft system structure of a pull-wire sensor according to claim 1, characterized in that: The worm shaft (13) is hollow, with a long flat portion provided at its lower end, and its upper end is transmission-connected to the electronic component via a worm gear (12).

6. The shaft system structure of a pull-wire sensor according to claim 5, characterized in that: The upper part of the long flat part of the worm shaft (13) is fixedly connected to the flat hole in the center of the winding wheel (7) on the surface of which the length measuring cable (9) is wound, and the lower part of the long flat part is connected to the external cable arrangement mechanism by tightening a nut or by a pin.

7. The shaft system structure of a pull-wire sensor according to claim 6, characterized in that: The electronic component is arranged in an electronic compartment formed by an electronic compartment cover (1) buckled onto a coil spring compartment cover (4), and the electronic component comprises a PCB board (2), a processor chip and a magnetic induction chip arranged on the PCB board (2), and a magnet installed at one end of a worm gear (12) and arranged relative to the magnetic induction chip.

8. The shaft system structure of a pull-wire sensor according to claim 7, characterized in that: A conductive slip ring (10) is provided at the upper end of the worm shaft (13), one end of the conductive slip ring (10) is connected to the PCB board (2), the inner end of the length measuring cable (9) is fixed to the winding wheel (7), passes through the wire hole (8) of the winding wheel (7), extends into the hollow cavity of the worm shaft (13), and is connected to the other end of the conductive slip ring (10), and a pull ring and a signal terminal are provided at the outer end of the length measuring cable (9), the signal terminal is used to connect to an external limit switch and then transmit the limit switch signal to the processor chip on the PCB board (2) through the length measuring cable (9).

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