Method and tool for assembling pull rope sensor

Abstract

The invention relates to an assembling method and tool for a pull rope sensor. The assembling method comprises the following steps of a first modular parallel process, a second modular parallel process and a third modular parallel process, wherein a winding wheel and a pull rope are pre-assembled; a second modular parallel process: preassembling a coil spring and a shaft system structure; and an integral assembling and pre-tightening process: assembling the whole shafting structure assembled with the coil spring and the whole coiling wheel assembled with the pull rope, and pre-tightening the coil spring. Compared with the prior art, the invention has the advantages of modular assembly, improved equipment production efficiency, saved production cost, improved product quality, prolonged service life and the like.

Description

Technical Field

[0001] The invention relates to the field of intelligent sensor production, and in particular to an assembly method and tooling for a draw-wire sensor. Background Art

[0002] A draw rope sensor is a sensor used to measure the linear displacement of an object. It detects the moving distance of the object by stretching or retracting the draw rope inside the sensor. The draw rope sensor is usually composed of a coil spring, a draw rope and an encoder (potentiometer).

[0003] The existing rope sensor assembly method is to gradually assemble the coil spring, winding wheel, rope and other components in a front-to-back order. After the coil spring is assembled, the winding wheel is assembled, and then the coil spring is connected to the winding wheel for pre-tightening according to the actual required rope length, and then the rope is connected to the winding wheel. Finally, the tension coil is wound on the winding wheel through the pre-tightening force of the coil spring itself.

[0004] However, such an assembly method has the following defects and deficiencies:

[0005] 1) Long production cycle

[0006] Due to the special nature of coil spring materials, it is easy for problems with quality and delivery time to occur, resulting in the inability to carry out subsequent processes in a timely manner, which in turn causes the production time to be extended and affects the production progress of the product;

[0007] 2) Difficulty in calculating the number of preload turns

[0008] The existing method needs to calculate the total number of pre-tensioning turns (front section pre-tensioning + rope length pre-tensioning) according to the actual length of the rope. Different lengths correspond to different total number of pre-tensioning turns, which is difficult to calculate. In addition, it is not easy to arrange the wire evenly when winding, which may encroach on the front section pre-tensioning turns, resulting in insufficient recovery force of the rope sensor and the inability to recover the rope.

[0009] 3) Inconvenient operation

[0010] The existing method requires too many total pre-tightening turns (usually dozens of turns), and the spring recovery force in the later stage of pre-tightening is too large to be manually operated, so corresponding assembly tooling needs to be designed. However, since the rope sensors are of different sizes and cannot be used compatibly, different products require corresponding tooling.

[0011] 4) Drawstring cutting is inconvenient

[0012] A pull ring is required to be installed at the end of the pull rope. In the existing method, after the pull rope is wound, the end of the pull rope needs to be fixed and then the corresponding pull rope cutting, processing and installation of the pull ring are carried out. Due to the excessive recovery force of the winding spring, the installation of the pull ring will also be inconvenient and inefficient.

[0013] Therefore, there is a need for an assembly method of a draw-wire sensor that is efficient, safe, accurate in counting, and easy to operate, and a corresponding tooling. Summary of the invention

[0014] In order to solve the technical problems in the background technology, the present invention provides an assembly method and tooling of a draw wire sensor, the method comprising:

[0015] The first modular parallel process: pre-assembly of the reel and the pull rope;

[0016] Second modular parallel process: pre-assembly of coil spring and shafting structure;

[0017] Overall assembly and preload process.

[0018] Furthermore, the first modular parallel process is specifically as follows:

[0019] Select the rope length according to the measuring range;

[0020] One end of the pull rope is tied to a pull ring and / or a wiring terminal;

[0021] The other end of the pull rope is fixed on the reel;

[0022] Wind the cable onto the reel and secure the pull ring and / or terminal;

[0023] The winding wheel with the pull rope wound around it is prepared as an assembly intermediate piece.

[0024] Furthermore, the length of the cut rope is 105% to 110% of the measuring range of the rope sensor.

[0025] Furthermore, the second modular parallel process is specifically as follows:

[0026] A shaft system structure for assembling the main body of the draw wire sensor;

[0027] Install the coil spring and secure the inner hook and outer hook;

[0028] The shaft system structure with the coil spring assembled is prepared as an assembly intermediate piece.

[0029] Furthermore, the overall assembly and pre-tightening process is specifically as follows:

[0030] Assemble the shaft system structure of the coil spring and the winding wheel with the pull rope assembled into the pull rope sensor body;

[0031] The front section of the coil spring is preloaded.

[0032] Furthermore, the number of pre-tightening turns n1 of the front section of the coil spring, the number of turns n2 of the wire wound on the winding wheel, and the maximum number of turns N that the coil spring can withstand have the following limiting relationship:

[0033] n1+n2≤(0.85~0.9)N

[0034]

[0035] An assembly tool for a draw wire sensor, comprising:

[0036] Winding device: used to pre-assemble the winding wheel and the pull rope, and prepare the winding wheel with the pull rope assembled;

[0037] Pre-tightening device: used to realize the pre-assembly of the coil spring and the shaft system structure, prepare the shaft system structure with the coil spring assembled as a whole and complete the pre-tightening of the front section of the coil spring.

[0038] Furthermore, the winding device includes a base plate fixed on the work surface, a vertical plate installed on the base plate, a motor and a mounting frame fixed on the upper part of the vertical plate, a bearing installed at the center of the mounting plate of the mounting frame, and a coupling. One end of the coupling is transmission connected to the motor output shaft, and the other end is transmission connected to the rotating shaft. The other end of the rotating shaft with a flat position passes through the bearing and is fixedly connected to the flat position hole in the center of the winding wheel through the flat position.

[0039] Furthermore, the pre-tightening device includes a lower plate fixed on the work surface, an upper plate installed above the lower plate, and fixing columns arranged at the edges of both sides of the upper plate, the top of the fixing column is provided with a screw hole, the upper plate is fixed to the lower plate by a plurality of studs, a circular through hole is opened in the middle of the upper plate, and an acrylic rubber ring is provided on the outer edge of the circular through hole, and a fixing frame is also provided at the position corresponding to the circular through hole in the middle of the lower plate.

[0040] Furthermore, the use of the assembly tool to assemble and pre-tighten the draw wire sensor specifically includes the following steps:

[0041] 1) Place the housing upright on the upper plate, install the second bearing, and then insert the worm shaft downward and out of the housing, so that the annular protrusion in the middle of the worm shaft presses the second bearing;

[0042] 2) The housing into which the worm shaft is inserted is inverted on the upper plate 9, and the upper end of the worm shaft is supported by the fixing frame, and the second shaft sealing ring and the third bearing are pressed in sequence and limited by the second retaining ring to complete the assembly of the worm shaft on the housing;

[0043] 3) Place the housing with the worm shaft assembled on the upper plate 9, place the coil spring in a natural state in the inner space of the housing, hook the inner hook with the groove of the worm shaft, and hook the outer hook with the protrusion to achieve initial positioning;

[0044] 4) buckle the coil spring bin cover with legs onto the housing, and make the upper end of the worm shaft pass through the coil spring bin cover, and by adjusting the position of the coil spring bin cover, hook the outer hook of the coil spring onto the positioning pin set in the pin hole to achieve final positioning, and then fix the coil spring bin cover and the housing with screws;

[0045] 5) Pressing the first shaft sealing ring and the first bearing in sequence between the coil spring compartment cover and the worm shaft, and limiting the position through the first retaining ring, completes the pre-assembly process of the coil spring and the shaft system structure;

[0046] 6) Align the entire reel with the assembled pull rope and install it on the flat position at the lower end of the worm shaft, and fix the support foot through the fixing column and the fixing screw, insert the handle into the hole at the bottom of the reel, turn the handle to pre-tighten the front section of the winding spring, and after pre-tightening, clamp one end of the pull rope with the pull ring and / or terminal to the wire clamp.

[0047] Compared with the prior art, the present invention has the following advantages:

[0048] 1. Modular assembly

[0049] 1) Modularize the assembly of the coil spring and housing, the reel and the rope, breaking the existing rope sensor assembly sequence of coil spring -> housing -> reel -> rope, and turning it into a separate assembly of coil spring and housing, reel and rope. Separate modular operation is more efficient and reduces the construction period caused by material problems to a certain extent.

[0050] 2) The winding wheel and the pull rope are assembled separately, which can get rid of the limitation of the shell. The winding assembly can be carried out using a universal winding tooling, without the need to design and develop a variety of tooling separately.

[0051] 3) Drawstrings can be cut and processed in batches, and corresponding pull rings and other components can be pre-assembled to improve production efficiency.

[0052] 2. Optimize preload method

[0053] 1) Since the winding wheel and the pull rope are assembled independently, after the winding wheel with the pull rope is assembled into the housing with the coil spring, only the front section pre-tightening (usually about 4-6 turns) is required for pre-tightening, and there is no need to pre-tighten the length of the pull rope, which simplifies the process design and improves the product design efficiency.

[0054] 2) The number of preload turns in the front section is small and the retraction force of the coil spring is limited, so the preload action can be performed manually, which is convenient and quick, and eliminates the need for tooling, saving production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 is a flow chart of the method of the present invention;

[0056] Figure 2 It is a structural schematic diagram of the tool winding device of the present invention;

[0057] Figure 3 It is a schematic diagram of the structure of the tooling winding device of the present invention equipped with a winding wheel;

[0058] Figure 4 It is a structural schematic diagram of the tooling pre-tightening device of the present invention;

[0059] Figure 5 It is a structural schematic diagram of a tooling pre-tightening device of the present invention equipped with a pull-wire sensor body;

[0060] Figure 6 This is a structural cross-sectional view of a tooling pre-tightening device of the present invention equipped with a pull-wire sensor body.

[0061] Description of reference numerals:

[0062] 1. Motor, 2. Vertical plate, 3. Bottom plate, 4. Coupling, 5. Flat shaft, 6. Bearing, 7. Mounting frame, 8. Lower plate, 9. Upper plate, 10. Fixed column, 11. Fixed frame, 12. Pin hole, 13. Protrusion, 14. Conductive slip ring, 15. First bearing, 16. First shaft sealing ring, 17. Second shaft sealing ring, 18. Third bearing, 19. Second bearing, 20. Worm shaft, 21. Winding wheel, 22. Spring magazine cover, 23. Support foot, 24. Housing. DETAILED DESCRIPTION

[0063] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0064] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0065] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0066] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0067] In the description of this embodiment, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connected", and "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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this embodiment can be understood according to specific circumstances.

[0068] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0069] Example

[0070] like Figure 1 As shown, the present invention provides an assembly method of a draw-wire sensor, in particular, an assembly method suitable for a large-range draw-wire sensor. The present invention disassembles the process steps to achieve modular production so as to ensure stable assembly of the sensor while solving the shortcomings of the existing method and improving production efficiency. The specific steps are as follows:

[0071] 1. Separate the assembly between the coil spring and the housing, and between the winding wheel and the pull rope into independent assembly processes so that they can be assembled separately and independently;

[0072] 2. According to the new modular assembly process, improve the overall assembly process of the draw-wire sensor product. The assembly process of the draw-wire sensor product mainly includes the following steps:

[0073] (1) Pre-assembly process of the reel and the pull rope (first modular parallel process);

[0074] (2) Pre-assembly process of coil spring and shaft structure (second modular parallel process);

[0075] (3) The assembly process between the shaft system structure with the coil spring assembled and the winding wheel structure with the pull rope assembled and the coil spring pre-tightening process.

[0076] The present invention takes the assembly process of a 20-meter range draw rope sensor as an example, and describes in detail the main assembly steps of the product as follows:

[0077] (1) Pre-assembly process of the reel and the pull rope:

[0078] First, according to the measuring range of the rope sensor, the length of the rope is selected (generally, the length of the rope to be cut is 105% to 110% of the measuring range of the rope sensor) and the rope is cut (if the feed length exceeds the selected length, cutting is required; if the feed length is just right, cutting is not required). After cutting, a pull ring and / or a terminal is tied to one end of the rope; then the other end of the rope is fixed to the winding wheel, and the winding wheel with one end of the rope fixed is used to tightly wind the rope around the winding wheel in regular layers through a winding device until the set number of turns is wound, and finally one end of the tied pull ring and / or terminal is clamped to the nearest notch on the outer edge of the winding wheel (in this example, there are 6 notches, which are evenly opened on the outer edge of the winding wheel, one is set every 60°, and the number can also be adjusted during actual operation), the pull ring and / or terminal are folded back and placed in the space at the bottom of the winding wheel to prevent it from being thrown out during pre-tightening, and finally a winding wheel with the rope wound is formed as a whole.

[0079] In the present invention, the winding wheel with the rope wound around it as a whole serves as a modular intermediate piece for subsequent steps. It can be assembled and produced in advance and multiple pieces can be prepared to prepare for the subsequent pre-tightening assembly process. This allows preparation in advance without being affected by subsequent processes, thereby reducing the overall assembly time and improving efficiency.

[0080] (2) Pre-assembly process of coil spring and shaft structure:

[0081] First, according to the assembly requirements, the shaft system structure of the pull-wire sensor body is assembled through the pre-tightening device, the coil spring is installed in the coil spring bin and the inner hook and the outer hook are fixed. After confirming that the coil spring can be normally tightened and loosened, the pre-assembly process of the coil spring and the housing is completed to form an integral shaft system structure with the coil spring assembled.

[0082] In the present invention, the shaft system structure with the coil spring assembled as a whole also serves as a modular intermediate piece for subsequent steps, and can be assembled and produced in advance in multiple preparations to prepare for the subsequent pre-tightening assembly process, which can effectively reduce the overall assembly time and improve efficiency. In addition, the present invention changes the assembly between the winding wheel and the pull rope from the original method of relying on the recovery force of the coil spring to pre-tighten the pull rope according to the length of the pull rope to make the pull rope be wound around the winding wheel, and then processing accessories such as the pull ring and the terminal at the end of the pull rope, to a method of batch cutting of the pull rope, processing of the corresponding pull ring and terminal accessories, and then using tooling for individual winding. This is convenient and quick, and improves assembly efficiency.

[0083] (3) Overall assembly and preload process

[0084] First, the shaft system structure with the assembled coil spring is inverted and fixed on the pretensioning device, and the winding wheel with the assembled pull rope is aligned and installed on the flat position at the lower end of the worm shaft, and then the front section of the coil spring is pretensioned (generally one twentieth to one tenth of the number of winding turns, and the pretensioning number of turns of the 20-meter range pull rope sensor in this example is set to 2 to 5 turns). The present invention adopts the front section pretensioning to replace the original front section pretensioning + pull rope length pretensioning method (for the 20-meter range pull rope sensor, the number of pretensioning turns required can reach 40 to 50 turns). After the pretensioning is completed, one end of the pull rope with a pull ring and / or a terminal is clamped to the wire clamp, and finally the assembly of the pull rope sensor body is completed.

[0085] Furthermore, in the present invention, in order to ensure that the rope has good telescopic performance under normal working conditions, the number of pre-tightening turns of the rope sensor needs to be strictly controlled, which can not only increase the service life of the rope, but also ensure good telescopic performance, ensure the consistency of length measurement, and avoid failures such as rope breakage or fatigue damage of the coil spring. Therefore, the number of pre-tightening turns n1, the number of turns n2 of the wire wound on the winding wheel 21, and the maximum number of turns N that the coil spring can withstand have the following limiting relationship:

[0086] n1+n2≤(0.85~0.9)N(1)

[0087]

[0088] Formula (1) indicates that the sum of the number of preloaded turns n1 and the number of turns n2 wound on the winding wheel 21 is less than the maximum number of turns N that the coil spring can withstand, and a margin of 0.15 to 0.1N is reserved to ensure safety, which can meet the requirements of range and safety (service life) and maximize the use of the coil spring;

[0089] Formula (2) indicates that the value of the number of pre-tightening turns n1 is between 0.05n2 and 0.1n2 (rounded up), which can not only meet the pre-tightening force requirements of the rope extension and contraction, facilitate quantitative control of the pre-tightening force, but also effectively extend the service life of the coil spring, so that it can operate stably for a long time under normal working conditions.

[0090] The present invention optimizes the overall assembly process by replacing the existing assembly process (the product coil spring is assembled into the corresponding housing, and the winding wheel can be assembled only after confirming that the coil spring can be normally loosened and tightened, and then the corresponding tooling is used to pre-tighten the coil spring (front section pre-tightening + rope length pre-tightening), and then the corresponding rope is assembled on the winding wheel, and then the rope is wound back on the winding wheel by the recovery force of the coil spring, and after rotating to a fixed number of turns (the number of rope length pre-tightening turns), the rope is clamped on the corresponding tooling, and then the rope is cut, processed, and the pull ring assembly is installed, etc.), and a parallel modular assembly process is adopted. When assembling the rope and the winding wheel, batch cutting and processing reduces the processing difficulty, improves the operation safety and production efficiency. In the coil spring pre-tightening process, there is no need to consider the rope length pre-tightening, which greatly reduces the total number of pre-tightening turns of the coil spring, shortens the operation time, reduces the difficulty of process design and the difficulty of actual operation, and this method can greatly shorten the overall assembly time, and is expected to reduce the assembly time by about 20 to 40%.

[0091] In order to realize the modular production process of the draw-wire sensor, the present invention also designs a modular production tooling for the draw-wire sensor, which includes two parts: a winding device and a pre-tightening device.

[0092] like Figure 2 As shown, the winding device includes a base plate 3 fixed on the work surface, a vertical plate 2 installed on the base plate 3, a motor 1 fixed on one side of the upper part of the vertical plate 2, a mounting frame 7 fixed on the other side of the upper part of the vertical plate 2, a bearing installed at the center of the mounting plate of the mounting frame 7, and a coupling 4, one end of the coupling 4 is transmission-connected to the output shaft of the motor 1, and the other end is transmission-connected to the rotating shaft, one end of the rotating shaft is inserted into the coupling 4, and the other end with a flat position passes through the bearing and is fixedly connected to the flat position hole in the center of the winding wheel 21 through the flat position.

[0093] like Figure 3 As shown, one end of the pull rope is first fixed to the winding wheel 21, and the other end of the pull rope is fixed with a pull ring / connecting terminal. Then, the center of the winding wheel 21 with the pull rope is inserted into the flat position of the rotating shaft and fixed with a nut. When winding, the rotation of the motor 1 (in this case, a DC reduction motor with low and adjustable speed is used) is controlled manually by a foot switch or automatically by a relay or the like to wind the pull rope around the winding wheel 21. In order to ensure uniform winding of the pull rope, the wire arrangement can be performed during the winding process by an external wire arrangement device or manually. When the pull rope is wound on the winding wheel 21 to a set number of turns, the other end with the pull ring and / or the connecting terminal is hung on the notch on the outer edge of the winding wheel 21, so that the pull ring and / or the connecting terminal are placed in the bottom space of the winding wheel 21 and are freely swung during the pre-tightening process, thereby completing the winding process of the winding wheel 21.

[0094] like Figure 4As shown, the pre-tightening device includes a lower plate 8 fixed on the work surface, an upper plate 9 installed above the lower plate 8, and fixing columns 10 arranged at the edges of both sides of the upper plate 9. A screw hole is provided at the top of the fixing column 10. The upper plate 9 is fixed to the lower plate 8 by a plurality of studs, and an installation space for a pull rope sensor is reserved between the upper plate 9 and the lower plate 8. A circular through hole is opened in the middle of the upper plate 9, and an acrylic rubber ring is provided on the outer edge of the circular through hole to prevent the shell 24 from being scratched. A fixing frame 11 is also provided at the position corresponding to the circular through hole in the middle of the lower plate 8.

[0095] like Figure 5 As shown, before the pre-tightening process, the coil spring needs to be placed in the coil spring bin, and the inner hook and the outer hook are fixed. At this time, the coil spring is in a natural state, and the winding wheel 21 with the pull rope wound is fixedly installed with the coil spring bin to form a whole. The whole is installed upside down on the acrylic rubber ring and fixed by pins, and the support feet of the pull rope sensor are fixed by screws and the screw holes at the top of the fixing column 10. After fixing, the rotating handle is inserted into the handle hole at the bottom of the winding wheel 21. According to the set number of pre-tightening turns (determined by the coil spring model and the length of the pull rope, generally 2-5 turns), after the pre-tightening is completed, the other end of the pull rope is removed from the notch, and passed through the wire clip so that the pull ring and / or the terminal block are stuck on the wire clip and cannot be retracted, and the pre-tightening process is completed.

[0096] like Figure 6 As shown, the shaft system structure of the main body of the pull rope sensor mainly includes a housing 24, a coil spring compartment cover 22 with legs 23 on both sides, a hollow worm shaft 20, and components such as bearings and shaft seals. The housing 24 is concave to form a space for placing the coil spring. The coil spring compartment cover 22 is buckled on the housing 24 to form a coil spring compartment. The hollow worm shaft 20 penetrates the housing 24 and the coil spring compartment cover 22 from the center. The upper end thereof is provided with a worm gear and a conductive slip ring 14, and the lower end is provided with a flat position fixedly installed with a winding wheel 21. The inner hook of the coil spring The groove hooked on the worm shaft 20 is initially positioned by the outer hook through the protrusion on the inner wall of the shell 24, and then re-fixed by the fixing pin on the pin hole 12 of the coil spring magazine cover 22. In addition, the worm shaft 20 is respectively crimped with the first shaft sealing ring 16 and the first bearing 15 at the contact point with the coil spring magazine cover 22, and is sealed by the first retaining ring. The worm shaft 20 is respectively crimped with the second bearing 19, the second shaft sealing ring 17 and the third bearing 18 at the contact point with the shell 24, and is sealed by the second retaining ring.

[0097] The steps of installing the shaft system structure of the rope sensor body and pre-tightening it using the pre-tightening device of the present invention are as follows:

[0098] 1) Place the housing 24 on the upper plate 9 of the preload device, install the second bearing 19, and then insert the worm shaft 20 downward and pass through the housing 24, so that the annular protrusion in the middle of the worm shaft 20 presses the second bearing 19;

[0099] 2) Invert the housing 24 into which the worm shaft 20 is inserted onto the upper plate 9 of the preload device, and support the upper end of the worm shaft 20 through the fixing frame 11, press in the second shaft seal ring 17 and the third bearing 18 in sequence, and limit the position through the second retaining ring, so as to complete the assembly of the worm shaft 20 on the housing 24;

[0100] 3) Place the housing 24 with the worm shaft 20 assembled on the upper plate 9 of the preload device, place the coil spring in a natural state in the inner space of the housing 24, and hook the inner hook with the groove of the worm shaft 20, and hook the outer hook with the protrusion 13 to achieve initial positioning;

[0101] 4) Buckle the coil spring compartment cover 22 with the support legs 23 onto the housing 24, and make the upper end of the worm shaft 20 pass through the coil spring compartment cover 22. By adjusting the position of the coil spring compartment cover 22, hook the outer hook of the coil spring onto the positioning pin set in the pin hole 12 to achieve final positioning, and then fix the coil spring compartment cover 22 and the housing 24 with screws;

[0102] 5) The first shaft sealing ring 16 and the first bearing 15 are pressed in sequence between the coil spring compartment cover 22 and the worm shaft 20, and the first retaining ring is used to limit the position, thereby completing the pre-assembly process of the coil spring and the shaft system structure;

[0103] 6) Align the assembled rope reel as a whole and install it on the flat position at the lower end of the worm shaft 20, and fix the support foot 23 through the fixing column 10 and the fixing screw to ensure the stability of the housing 24, insert the handle into the hole at the bottom of the reel 21, and turn the handle to pre-tighten the front section of the winding spring. After the pre-tightening is completed, clamp one end of the rope with the pull ring and / or the terminal block to the wire clamp, and finally complete the assembly of the rope sensor body.

[0104] In summary, the present invention provides a modular assembly method for a rope-drawing sensor and corresponding assembly tooling. From the perspective of the process flow, the winding of the winding wheel and the installation of the shaft system structure are divided into two parts that do not interfere with each other and are carried out simultaneously. Finally, the two are assembled and the process of pre-tightening the spring is completed. This can not only shorten the assembly time and improve the assembly efficiency, but also extend the service life of the rope-drawing sensor spring and improve the product quality. The application of the present invention can achieve good results and can be extended to the production and manufacturing processes of products such as inclination sensors and pressure sensors.

[0105] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A method for assembling a draw wire sensor, characterized in that: include: The first modular parallel process: pre-assembly of the reel and the pull rope; Second modular parallel process: pre-assembly of coil spring and shafting structure; Overall assembly and preload process.

2. The method for assembling a pull-wire sensor according to claim 1, characterized in that: The first modular parallel process is specifically as follows: Select the rope length according to the measuring range; One end of the pull rope is tied to a pull ring and / or a wiring terminal; The other end of the pull rope is fixed on the reel; Wind the cable onto the reel and secure the pull ring and / or terminal; The winding wheel with the pull rope wound around it is prepared as an assembly intermediate piece.

3. The method for assembling a pull-wire sensor according to claim 2, characterized in that: The length of the cut rope is 105% to 110% of the measuring range of the rope sensor.

4. The method for assembling a draw wire sensor according to claim 1, characterized in that: The second modular parallel process is specifically as follows: A shaft system structure for assembling the main body of the draw wire sensor; Install the coil spring and secure the inner and outer hooks; The shaft system structure with the coil spring assembled is prepared as an assembly intermediate piece.

5. The method for assembling a draw wire sensor according to claim 1, characterized in that: The overall assembly and pre-tightening process is specifically as follows: Assemble the shaft system structure of the coil spring and the winding wheel with the pull rope assembled into the pull rope sensor body; The front section of the coil spring is preloaded.

6. The method for assembling a draw wire sensor according to claim 5, characterized in that: The number of pre-tightening turns n1 of the coil spring, the number of turns n2 of the winding wheel, and the maximum number of turns N that the coil spring can withstand have the following limiting relationship: n1+n2≤(0.85~0.9)N 7. An assembly tool for implementing the assembly method of the draw wire sensor according to any one of claims 1 to 6, characterized in that: include: Winding device: used to pre-assemble the winding wheel and the pull rope, and prepare the winding wheel with the pull rope assembled; Pre-tightening device: used to realize the pre-assembly of the coil spring and the shaft system structure, prepare the shaft system structure with the coil spring assembled as a whole and complete the pre-tightening of the front section of the coil spring.

8. An assembly tool according to claim 7, characterized in that: The winding device comprises a bottom plate (3) fixed on a work surface, a vertical plate (2) mounted on the bottom plate (3), a motor (1) and a mounting frame (7) fixed on the upper part of the vertical plate (2), a bearing mounted at the center of the mounting plate of the mounting frame (7), and a coupling (4); one end of the coupling (4) is drivingly connected to the output shaft of the motor (1), and the other end is drivingly connected to the rotating shaft; the other end of the rotating shaft with a flat part passes through the bearing and is fixedly connected to the flat part hole in the center of the winding wheel (21) through the flat part.

9. An assembly tool according to claim 8, characterized in that: The pre-tightening device comprises a lower plate (8) fixed on the work surface, an upper plate (9) installed above the lower plate (8), and fixing columns (10) arranged at the edges of both sides of the upper plate (9), the fixing columns (10) are provided with screw holes at the top ends, the upper plate (9) is fixed to the lower plate (8) by a plurality of screws, a circular through hole is provided in the middle of the upper plate (9), an acrylic rubber ring is provided at the outer edge of the circular through hole, and a fixing frame (11) is also provided at the position of the circular through hole in the middle of the lower plate (8).

10. An assembly tool according to claim 9, characterized in that: The use of the assembly tool to assemble and pre-tighten the draw wire sensor specifically includes the following steps: 1) placing the housing (24) upright on the upper plate (9), installing the second bearing (19), and then inserting the worm shaft (20) downward into and out of the housing (24), so that the annular protrusion in the middle of the worm shaft (20) presses the second bearing (19); 2) The housing (24) into which the worm shaft (20) is inserted is inverted on the upper plate 9, and the upper end of the worm shaft (20) is supported by the fixing frame (11), and the second shaft sealing ring (17) and the third bearing (18) are pressed in sequence and limited by the second retaining ring, thereby completing the assembly of the worm shaft (20) on the housing (24); 3) placing the housing (24) assembled with the worm shaft (20) on the upper plate 9, placing the coil spring in a natural state in the inner space of the housing (24), and hooking the inner hook with the groove of the worm shaft (20), and hooking the outer hook with the protrusion (13) to achieve initial positioning; 4) buckling the coil spring bin cover (22) with the supporting feet (23) onto the housing (24), and making the upper end of the worm shaft (20) pass through the coil spring bin cover (22), adjusting the position of the coil spring bin cover (22), hooking the outer hook of the coil spring onto the positioning pin provided in the pin hole (12), achieving final positioning, and then fixing the coil spring bin cover (22) and the housing (24) by screws; 5) The first shaft sealing ring (16) and the first bearing (15) are sequentially pressed between the coil spring compartment cover (22) and the worm shaft (20), and the coil spring and the shaft system structure are pre-assembled by limiting the position with the first retaining ring; 6) Align the entirety of the winding wheel with the assembled pull rope and install it on the flat position at the lower end of the worm shaft (20), and fix the support foot (23) by means of the fixing column (10) and the fixing screw, insert the handle into the hole at the bottom of the winding wheel (21), and turn the handle to pre-tighten the front section of the winding spring. After the pre-tightening is completed, clamp one end of the pull rope with the pull ring and / or the terminal block onto the wire clamp.

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