Rotary conductive device with signal switching function

Abstract

The invention provides a rotary conductive device with a signal switching function. The rotary conductive device comprises a rotary mechanism and a conductive mechanism, the rotating mechanism comprises a core body, an upper insulating spacer, an upper bearing, a lower bearing, a lower insulating spacer, an end fixing ring, a first fastening nail and a sliding ring shell. The conductive mechanism comprises an upper support, a copper ring, a lower support, a second fastening nail, a measuring pin, a male pin, a lead and a potting adhesive. The method has the beneficial effects that compared with a traditional spot measurement mode after tightening, the pre-tightening force control precision is improved to + / -1.5%, and the rework rate is reduced to 4%; the problem that the pre-tightening force of a single bolt cannot be calibrated in real time in traditional symmetrical tightening is solved, and the qualified rate of flange sealing is increased to 99%.

Description

Technical Field

[0001] The invention belongs to the technical field of tightening mechanisms, and in particular relates to a rotating conductive device with a signal switching function. Background Art

[0002] Most existing installation methods can only install bolts by controlling the torque according to the installation process requirements. The torque coefficient is a range, and the preload force can only be estimated. In recent years, sensors attached to the end faces of bolts or plated sensors have appeared to measure the preload force of bolts. However, the preload force can only be measured after the bolts are tightened, and point measurements are taken after the bolts are installed, and then the installed bolts are adjusted. In the fields of automobiles, aerospace, rail transportation, etc., the preload force needs to be controlled for key parts. If the preload force cannot be accurately controlled, it may lead to poor sealing, excessive wear of parts, etc., and even slight preload force deviations may cause serious consequences under extreme working conditions. Therefore, a device is designed that can achieve preload force signal transfer and real-time monitoring of preload force during the tightening process. Summary of the Invention

[0003] In view of this, the present invention aims to propose a rotating conductive device with a signal switching function to solve the problems of the existing technology in bolt preload force measurement, such as complex operation and poor real-time performance.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows: A rotating conductive device with a signal transfer function, comprising a rotating mechanism and a conductive mechanism; the rotating mechanism comprises a core, an upper insulating gasket, an upper bearing, a lower bearing, a lower insulating gasket, an end fixing ring, a first fastening pin, and a slip ring housing; the conductive mechanism comprises an upper bracket, a copper ring, a lower bracket, a second fastening pin, a measuring needle, a male needle, a lead, and glue potting; The upper bearing and the lower bearing are both sleeved on the middle part of the core body, the slip ring housing is sleeved on the upper bearing and the lower bearing, an upper insulating gasket is provided between the slip ring housing and the core head, an end fixing ring is provided below the slip ring housing, the end fixing ring is sleeved on the middle part of the core body, and a lower insulating gasket is provided between the end fixing ring and the slip ring housing, and the end fixing ring is installed on the core body by fastening nails; The upper bracket and the lower bracket are both sleeved on the middle part of the core body. The upper bracket is arranged below the upper bearing and is connected to the upper bearing. The lower bracket is arranged above the lower bearing and is connected to the lower bearing. The copper ring sleeves the upper bracket and the lower bracket. The measuring needle is inserted into the core body and is installed inside the core body through a second fastening nail. The measuring needle is connected to a male needle inside the core body, the male needle is connected to a lead wire, the lead wire is connected to the copper ring, and the male needle is installed inside the core body by glue pouring.

[0005] Furthermore, the middle portion of the core body is interference fit with the upper bearing and the lower bearing, and the sliding ring housing is transition fit with the upper bearing and the lower bearing.

[0006] Furthermore, the middle portion of the core body is interference fit with the upper bracket and the lower bracket.

[0007] Furthermore, the male needle is welded to the lead wire, and the lead wire is welded to the copper ring.

[0008] Furthermore, the conductive mechanism also includes a screw, a spring thimble, a hollow glass fiber and an SMA female head. The SMA female head is installed on the base of the slip ring housing through the screw. The hollow glass fiber is installed inside the base of the slip ring housing. The spring thimble is placed inside the hollow glass fiber. One end of the spring thimble is connected to the SMA female head, and the other end of the spring thimble is in contact with the copper ring.

[0009] Furthermore, the hollow glass fiber is interference-fitted with the interior of the base of the sliding ring housing.

[0010] Furthermore, the measuring needle includes a socket, a spring probe and a protection tube. The protection tube is sleeved with the spring probe, the spring probe is inserted into the socket, and the protection tube is installed inside the core body through a second fastening pin.

[0011] Furthermore, the spring probe is interference fit with the protection tube.

[0012] Furthermore, the SMA female connector is connected to an external coaxial cable.

[0013] Compared with the prior art, the rotating conductive device with signal switching function described in the present invention has the following beneficial effects: (1) According to the bolt model, different conductive mechanisms are installed, and the rotating mechanism adjusts the position of the measuring cable. The tightening process does not interfere with the position of the measuring cable, thereby realizing the preload force signal transfer during the tightening process and achieving the purpose of measuring the preload force.

[0014] (2) The preload force signal transfer function is realized during the tightening process, breaking through the traditional preload force measurement method. The operator can grasp the preload force of the fastener in a timely manner during the installation process.

[0015] (3) Compared with the traditional “point measurement after tightening” method, the present invention improves the preload control accuracy to ±1.5% and reduces the rework rate to 4%. It solves the problem of “inability to calibrate the preload of a single bolt in real time” in traditional symmetrical tightening and improves the flange sealing qualification rate to 99%. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 Schematic diagram of a closed-loop control tightening system according to an embodiment of the present invention; Figure 3 It is a front view schematic diagram of the overall structure according to an embodiment of the present invention; Figure 4 A schematic side view of the overall structure according to an embodiment of the present invention; Figure 5 A schematic top view of the overall structure according to an embodiment of the present invention; Figure 6 It is a schematic cross-sectional view of the overall structure according to an embodiment of the present invention; Figure 7 Schematic diagram of the measuring needle according to an embodiment of the present invention.

[0017] Description of reference numerals: 1. Core; 2. Upper insulating gasket; 3. Upper bearing; 4. Upper bracket; 5. Copper ring; 6. Lower bracket; 7. Lower bearing; 8. Lower insulating gasket; 9. Fastening nail 2; 10. Jack; 11. Spring probe; 12. Protective tube; 13. End fixing ring; 14. Fastening nail 1; 15. Screw; 16. Spring thimble; 17. Hollow glass fiber; 18. SMA female connector; 19. Slip ring housing; 20. Male pin; 21. Lead wire; 22. Glue potting. DETAILED DESCRIPTION

[0018] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0020] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0021] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0022] like Figures 1 to 7 As shown, a rotating conductive device with a signal switching function includes a rotating mechanism and a conductive mechanism; the rotating mechanism includes a core 1, an upper insulating gasket 2, an upper bearing 3, a lower bearing 7, a lower insulating gasket 8, an end fixing ring 13, a fastening pin 14 and a slip ring housing 19; the conductive mechanism includes an upper bracket 4, a copper ring 5, a lower bracket 6, a fastening pin 2 9, a measuring needle, a male needle 20, a lead 21, a glue potting 22, a screw 15, a spring thimble 16, a hollow glass fiber 17 and an SMA female connector 18.

[0023] In a preferred embodiment of the present invention, the upper bearing 3 and the lower bearing 7 are both sleeved on the middle part of the core body 1, the slip ring housing 19 is sleeved on the upper bearing 3 and the lower bearing 7, an upper insulating gasket 2 is provided between the slip ring housing 19 and the head of the core body 1, an end fixing ring 13 is provided below the slip ring housing 19, the end fixing ring 13 is sleeved on the middle part of the core body 1, and a lower insulating gasket 8 is provided between the end fixing ring 13 and the slip ring housing 19, and the end fixing ring 13 is installed on the core body 1 by a fastening nail 14; the middle part of the core body 1 is interference fit with the upper bearing 3 and the lower bearing 7, and the slip ring housing 19 is transition fit with the upper bearing 3 and the lower bearing 7. In this embodiment, the core body 1 and the slip ring housing 19 are separated by an insulating gasket, and the slip ring housing 19 and the end fixing ring 13 are separated by an insulating gasket. The insulating gasket mainly plays a role of wear resistance and lubrication during rotation. The middle part of the core body 1 has an interference fit with the bearing and the bearing, and the slip ring housing 19 has a transition fit with the bearing and the bearing, forming the mechanical structure basis for the relative rotation movement of the core body 1 and the slip ring housing 19. The end fixing ring 13 is fixed to the core body 1 by fastening nails to limit the slip ring housing 19.

[0024] In a preferred embodiment of the present invention, the upper bracket 4 and the lower bracket 6 are both sleeved on the middle part of the core body 1, the upper bracket 4 is arranged below the upper bearing 3, and is connected to the upper bearing 3, the lower bracket 6 is arranged above the lower bearing 7, and is connected to the lower bearing 7, the copper ring 5 sleeves the upper bracket 4 and the lower bracket 6, the measuring needle is inserted into the interior of the core body 1, and the measuring needle is installed inside the core body 1 through a fastening nail 29, the measuring needle is connected to the male needle 20 inside the core body 1, the male needle 20 is connected to the lead 21, the lead 21 is connected to the copper ring 5, and the male needle 20 is installed inside the core body 1 by glue pouring 22; the middle part of the core body 1 is interference fit with the upper bracket 4 and the lower bracket 6; the male needle 20 is welded to the lead 21, and the lead 21 is welded to the copper ring 5. In this embodiment, the upper bracket 4 and the lower bracket 6 are installed between the upper bearing 3 and the lower bearing 7, supporting the upper bearing 3 and the lower bearing 7. The copper ring 5 is sleeved on the outside of the upper bracket 4 and the lower bracket 6, supporting and insulating the copper ring 5. The measuring needle is connected to the male needle 20, the male needle 20 is connected to the lead 21, and the lead 21 is connected to the copper ring 5, thereby realizing the electrical connection between the measuring needle and the copper ring 5.

[0025] In a preferred embodiment of the present invention, the conductive mechanism further includes a screw 15, a spring thimble 16, a hollow glass fiber 17 and an SMA female connector 18. The SMA female connector 18 is installed on the base of the slip ring housing 19 through the screw 15. The hollow glass fiber 17 is installed inside the base of the slip ring housing 19. The spring thimble 16 is placed inside the hollow glass fiber 17. One end of the spring thimble 16 is connected to the SMA female connector 18, and the other end of the spring thimble 16 is in contact with the copper ring 5; the hollow glass fiber 17 is interference fit with the inside of the base of the slip ring housing 19; and the SMA female connector 18 is connected to an external coaxial cable. In this embodiment, different conductive mechanisms are replaced according to the bolt model, and the rotating mechanism adjusts the position of the external coaxial cable. An insulating environment is formed inside the hollow glass fiber 17. The SMA female connector 18 presses the spring thimble 16 inside the hollow glass fiber 17. The external coaxial cable is connected to the SMA female connector 18, and the SMA female connector 18 is connected to the spring thimble 16. The spring thimble 16 is in contact and connected with the copper ring 5, and the copper ring 5 is connected to the measuring needle, forming an electrical connection between the external coaxial cable and the measuring needle. The tightening process does not interfere with the position of the measuring cable, thereby realizing the preload signal transfer during the tightening process and achieving the purpose of measuring the preload.

[0026] In a preferred embodiment of the present invention, the measuring needle comprises a socket 10, a spring probe 11, and a protective tube 12. The protective tube 12 is sleeved with the spring probe 11, which is inserted into the socket 10 and mounted within the core 1 via a fastening pin 9. The spring probe 11 and the protective tube 12 have an interference fit. In this embodiment, a detachable measuring needle mechanical structure is formed.

[0027] Example 1: Automobile engine cylinder head bolt installation Scenario requirements: Deviation in the preload force of the engine cylinder head bolts may lead to poor cylinder sealing and oil leakage. The preload force needs to be monitored in real time during the tightening process (with an accuracy requirement of ±2%).

[0028] Device adaptation: According to the cylinder head bolt model, replace the measuring needle of the corresponding specification (adjust the spring probe length and the protection tube diameter) to ensure accurate contact with the sensor on the bolt end face.

[0029] Operation process: 1. Connect the present invention to a tightening tool (such as an electric wrench). The core rotates with the wrench, while the slip ring housing remains stationary, preventing external cables from getting entangled. 2. When the bolt is tightened, the preload force signal generated by the surface sensor is transmitted to the preload force measuring instrument through the measuring needle → male needle → lead → copper ring → spring thimble → SMA female connector; 3. The operator observes the pre-tightening force value in real time. When it reaches the preset value (such as 120N·m), stop tightening immediately to avoid over-tightening or under-tightening.

[0030] Beneficial effect: Compared with the traditional "point measurement after tightening" method, the present invention improves the preload force control accuracy to ±1.5% and reduces the rework rate to 4%.

[0031] Example 2: Flange connection of space rocket fuel tank Scenario requirements: Uneven pre-tightening force on the fuel tank flange bolts may cause fuel leakage. The pre-tightening force of each bolt needs to be monitored in real time during rotary tightening (symmetrical and synchronous tightening of multiple bolts).

[0032] Device adaptation: Multiple sets of copper rings and spring pins (corresponding to multiple bolts) are used to connect to a multi-channel data acquisition instrument through an SMA female connector to achieve synchronous transmission of multiple signals.

[0033] Operation process: 1. The present invention is installed on a synchronous tightening device, and each bolt corresponds to a set of measuring needles and copper rings; 2. During tightening, each set of signals is transmitted to the data acquisition instrument through an independent path to generate a real-time preload curve; 3. If the preload force of a bolt deviates from the threshold (e.g., the preset value is 150 N·m, but the actual value is 140 N·m), the system automatically adjusts the tightening torque of the bolt until it meets the standard.

[0034] Beneficial effect: It solves the problem of "inability to calibrate the preload of a single bolt in real time" in traditional symmetrical tightening, and increases the flange sealing qualification rate to 99%.

[0035] Example 3: To verify the advantages of the present invention over the traditional "point test after tightening" method and the traditional symmetrical tightening process, we conducted a comparative experiment. The experimental data and results are presented as follows: 1. Experimental Subjects and Conditions This experiment selected bolt and flange assemblies from the same batch and specifications. The two groups were divided into two groups and operated using the traditional method and the present invention, respectively. The experimental environment was kept consistent, including temperature, humidity, and tool accuracy.

[0036] 2. Comparative experiment of preload control accuracy and rework rate 1. Experimental process Each group of 100 bolts was tightened using the corresponding method. The traditional "test after tightening" method tests the bolt preload force after tightening. The present invention controls the preload force in real time during the tightening process and tests it after completion. The deviation in preload force for each group of bolts, as well as the number of bolts requiring rework, was recorded.

[0037] 2. Experimental data ; 3. Results Analysis The experimental data clearly shows that the traditional "post-tightening point measurement" method results in a large preload deviation, ranging from ±5% to ±8%. This invention significantly improves preload control accuracy to ±1.5%. Furthermore, the rework rate for the traditional method is 20%, while the rework rate for this invention is only 4%, significantly improving production efficiency and reducing production costs.

[0038] 3. Comparative experiment on flange sealing qualification rate 1. Experimental process 100 flange assemblies were selected from each group and tightened using the traditional symmetrical tightening process and the present invention. After tightening, the flange assemblies were tested for sealing performance, and the number of flange assemblies with qualified sealing was recorded.

[0039] 2. Experimental data ; 3. Results Analysis The traditional symmetrical tightening process cannot calibrate the preload of individual bolts in real time, resulting in uneven preload on each bolt, affecting the flange's sealing performance and resulting in a sealing pass rate of only 90%. This invention solves this problem by calibrating the preload of individual bolts in real time, significantly improving the flange's sealing performance and achieving a sealing pass rate of 99%, effectively meeting the needs of applications with extremely high sealing requirements.

[0040] In summary, the experimental data fully verify the significant advantages of the present invention in terms of preload control accuracy, reduction of rework rate and improvement of flange sealing qualification rate.

[0041] Working principle: The core of this invention is to achieve real-time transfer and transmission of preload force signals during bolt tightening by combining mechanical structure design with electrical signal conduction paths. Its working principle can be divided into two levels: mechanical coordination and signal conduction. 1. Mechanical coordination principle Rotational stability is ensured: The core 1 employs an interference fit with the upper and lower bearings 3 and 7, while the slip ring housing 19 employs a transition fit with the bearings, creating a structure that allows for relative rotation between the core and slip ring housing. The upper and lower insulating washers 2 and 8 not only isolate the core and slip ring housing but also reduce wear during rotation, ensuring mechanical stability during tightening.

[0042] Component fixing and limiting: The end fixing ring 13 is fixed to the core body by a fastening nail 14 to limit the axial displacement of the slip ring housing; the upper bracket 4 and the lower bracket 6 are interference fit with the core body, which not only supports the copper ring 5, but also helps to fix the bearing position to prevent the components from loosening during rotation.

[0043] 2. Signal transduction principle The transmission path of the preload force signal is the bolt end sensor → measuring needle → internal conduction component → external measuring device. The specific process is as follows: Signal Acquisition: When a bolt is tightened, the magnetron sputtering sensor and strain gauges on its surface generate a preload force electrical signal. This signal is acquired through contact between the measuring needle and the bolt sensor. The spring probe 11 in the measuring needle ensures a stable connection with the sensor through elastic contact, while the protective tube 12 prevents damage to the probe during rotation.

[0044] Internal conduction: The measuring needle transmits the signal to the male pin 20, which is connected to the copper ring 5 via a soldered lead 21, achieving signal transmission from the core to the copper ring. Glue 22 secures the relative position of the male pin and the core, preventing vibration interference in signal transmission.

[0045] Rotary Adapter: As the copper ring rotates with the core, the spring pin 16 on the slip ring housing 19 maintains contact with the copper ring. The spring pin's elasticity ensures close contact, and the signal is transmitted through the spring pin to the SMA female connector 18. The hollow glass fiber 17 provides an insulating environment for the spring pin to prevent signal interference.

[0046] The external transmission SMA female connector is connected to an external coaxial cable to transmit the signal to the preload force measuring instrument to achieve real-time display and recording of the preload force.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A rotating conductive device with a signal transfer function, characterized in that: It comprises a rotating mechanism and a conducting mechanism; the rotating mechanism comprises a core (1), an upper insulating gasket (2), an upper bearing (3), a lower bearing (7), a lower insulating gasket (8), an end fixing ring (13), a first fastening nail (14) and a slip ring housing (19); the conducting mechanism comprises an upper bracket (4), a copper ring (5), a lower bracket (6), a second fastening nail (9), a measuring needle, a male needle (20), a lead wire (21) and a glue potting (22); The upper bearing (3) and the lower bearing (7) are both sleeved on the middle part of the core body (1); the slip ring housing (19) is sleeved on the upper bearing (3) and the lower bearing (7); an upper insulating gasket (2) is provided between the slip ring housing (19) and the head of the core body (1); an end fixing ring (13) is provided below the slip ring housing (19); the end fixing ring (13) is sleeved on the middle part of the core body (1); and a lower insulating gasket (8) is provided between the end fixing ring (13) and the slip ring housing (19); the end fixing ring (13) is installed on the core body (1) by a fastening nail (14); The upper bracket (4) and the lower bracket (6) are both sleeved on the middle part of the core body (1); the upper bracket (4) is arranged below the upper bearing (3) and is connected to the upper bearing (3); the lower bracket (6) is arranged above the lower bearing (7) and is connected to the lower bearing (7); the copper ring (5) sleeves the upper bracket (4) and the lower bracket (6); the measuring needle is inserted into the interior of the core body (1) and is installed in the interior of the core body (1) through a second fastening nail (9); the measuring needle is connected to a male needle (20) in the interior of the core body (1); the male needle (20) is connected to a lead wire (21); the lead wire (21) is connected to the copper ring (5); the male needle (20) is installed in the interior of the core body (1) through glue injection (22).

2. The rotating conductive device with signal switching function according to claim 1, characterized in that: The middle portion of the core body (1) is interference-fitted with the upper bearing (3) and the lower bearing (7), and the slip ring housing (19) is transitionally fitted with the upper bearing (3) and the lower bearing (7).

3. The rotating conductive device with signal switching function according to claim 1, characterized in that: The middle portion of the core (1) is interference-fitted with the upper bracket (4) and the lower bracket (6).

4. The rotating conductive device with signal switching function according to claim 1, characterized in that: The male needle (20) is welded to the lead wire (21), and the lead wire (21) is welded to the copper ring (5).

5. The rotating conductive device with signal switching function according to claim 1, characterized in that: The conductive mechanism further comprises a screw (15), a spring thimble (16), a hollow glass fiber (17) and an SMA female head (18); the SMA female head (18) is mounted on a base of a slip ring housing (19) via the screw (15); the hollow glass fiber (17) is mounted inside the base of the slip ring housing (19); the spring thimble (16) is placed inside the hollow glass fiber (17); one end of the spring thimble (16) is connected to the SMA female head (18), and the other end of the spring thimble (16) is in contact with the copper ring (5).

6. The rotating conductive device with signal switching function according to claim 5, characterized in that: The hollow glass fiber (17) is interference-fitted with the interior of the base of the sliding ring housing (19).

7. The rotating conductive device with signal switching function according to claim 1, characterized in that: The measuring needle comprises a socket (10), a spring probe (11) and a protection tube (12); the protection tube (12) is sleeved with the spring probe (11); the spring probe (11) is inserted into the socket (10); and the protection tube (12) is installed inside the core body (1) through a second fastening pin (9).

8. The rotating conductive device with signal switching function according to claim 7, characterized in that: The spring probe (11) and the protection tube (12) are interference fit.

9. The rotating conductive device with signal switching function according to claim 5, characterized in that: The SMA female connector (18) is connected to an external coaxial cable.

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