Rotary electrically conductive device with signal switching function

Abstract

The application provides a rotating electric conduction device with signal switching function, comprising a rotating mechanism and an electric conduction mechanism; the rotating mechanism comprises a core body, an upper insulating gasket, an upper bearing, a lower bearing, a lower insulating gasket, an end fixed ring, a fastening nail I and a slip ring shell; the electric conduction mechanism comprises an upper support, a copper ring, a lower support, a fastening nail II, a measuring needle, a male needle, a lead wire and glue pouring; the application has the beneficial effects that compared with the traditional "tightening and then measuring" mode, the pre-tightening force control precision is improved to ±1.5%, and the rework rate is reduced to 4%; the problem of "unable to real-time calibrate single bolt pre-tightening force" in the traditional symmetrical tightening is solved, and the flange sealing qualified rate is improved to 99%.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of tightening mechanism, in particular to a rotating conductive device with signal switching function. BACKGROUND

[0002] Most of the existing installation methods can only install bolts by controlling torque according to the installation process requirements, and the torque coefficient is a range, which can only estimate the pre-tightening force. In recent years, sensors are pasted on the end face of the bolt or plated to measure the bolt pre-tightening force, but the current pre-tightening force measurement can only be measured after the bolt is tightened, and the bolt is measured after installation, and then the installed bolt is adjusted. In the fields of automobile, aerospace, rail transportation and other fields, the fastening connection of key parts needs to control the size of pre-tightening force, if the pre-tightening force cannot be accurately controlled, it may cause sealing not tight, parts excessive wear and other conditions, and small pre-tightening force deviation may even cause serious consequences under extreme conditions, therefore, a device capable of achieving pre-tightening force signal switching and real-time monitoring of pre-tightening force during tightening is designed. SUMMARY

[0003] Therefore, the present application aims to provide a rotating conductive device with signal switching function to solve the problems of complex operation and poor real-time performance of the prior art for measuring the pre-tightening force of the bolt.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0005] A rotating conductive device with signal switching function, comprising a rotating mechanism and a conductive mechanism; the rotating mechanism comprises a core body, an upper insulating gasket, an upper bearing, a lower bearing, a lower insulating gasket, an end fixed ring, a fastening nail one and a slip ring shell; the conductive mechanism comprises an upper support, a copper ring, a lower support, a fastening nail two, a measuring needle, a male needle, a lead wire and a glue filling;

[0006] The upper bearing and the lower bearing are sleeved on the middle part of the core body, the slip ring shell is sleeved on the upper bearing and the lower bearing, the upper insulating gasket is arranged between the slip ring shell and the head of the core body, the end fixed ring is arranged below the slip ring shell, the end fixed ring is sleeved on the middle part of the core body, and the lower insulating gasket is arranged between the end fixed ring and the slip ring shell, and the end fixed ring is installed on the core body through the fastening nail one;

[0007] The upper support and the lower support are sleeved on the middle part of the core body, the upper support is arranged below the upper bearing and connected with the upper bearing, the lower support is arranged above the lower bearing and connected with the lower bearing, the copper ring is sleeved on the upper support and the lower support, the measuring needle is inserted into the core body, the measuring needle is installed in the core body through the fastening nail two, the measuring needle is connected with the male needle in the core body, the male needle is connected with the lead wire, the lead wire is connected with the copper ring, and the male needle is installed in the core body through the glue filling.

[0008] Further, the middle part of the core body is in interference fit with the upper bearing and the lower bearing, and the slip ring shell is in transition fit with the upper bearing and the lower bearing.

[0009] Further, the middle part of the core body is in interference fit with the upper bearing and the lower bearing, and the slip ring shell is in transition fit with the upper bearing and the lower bearing.

[0010] Further, the male needle is welded with the lead wire, and the lead wire is welded with the copper ring.

[0011] Further, the conductive mechanism further comprises a screw, a spring needle, a hollow glass fiber and an SMA female head, the SMA female head is installed on the base body of the slip ring shell through the screw, the hollow glass fiber is installed inside the base body of the slip ring shell, the spring needle is placed inside the hollow glass fiber, one end of the spring needle is connected with the SMA female head, and the other end of the spring needle is in contact with the copper ring.

[0012] Further, the hollow glass fiber is in interference fit with the inside of the base body of the slip ring shell.

[0013] Further, the measuring needle comprises a socket, a spring probe and a protective tube, the protective tube is sleeved with the spring probe, the spring probe is inserted into the socket, and the protective tube is installed inside the core body through the fastening nails.

[0014] Further, the spring probe is in interference fit with the protective tube.

[0015] Further, the SMA female head is connected with an external coaxial cable.

[0016] Compared with the prior art, the rotating conductive device with signal switching function has the following beneficial effects:

[0017] (1) Different conductive mechanisms are replaced according to the type of the bolt, the position of the measuring cable is adjusted by the rotating mechanism, the position of the measuring cable is not interfered in the tightening process, and the pre-tightening force signal switching in the tightening process is realized, so that the purpose of measuring the pre-tightening force is achieved.

[0018] (2) The pre-tightening force signal switching function in the tightening process is realized, the traditional pre-tightening force measurement method is broken through, and the operator can timely master the pre-tightening force of the fastener during installation.

[0019] (3) Compared with the traditional "post-tightening point measurement" method, the pre-tightening force control precision of the present application is improved to ±1.5%, and the rework rate is reduced to 4%; the problem of "unable to real-time calibrate single bolt pre-tightening force" in the traditional symmetrical tightening is solved, and the flange sealing qualification rate is improved to 99%. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The illustrations are given primarily for purposes of illustrating the preferred embodiments of the application and do not limit the present application. In the drawings:

[0021] Figure 1 The overall structure schematic diagram of the embodiment of the present application;

[0022] Figure 2 The closed-loop control tightening system schematic diagram of the embodiment of the present application;

[0023] Figure 3 The overall structure front view schematic diagram of the embodiment of the present application;

[0024] Figure 4 The overall structure side view schematic diagram of the embodiment of the present application;

[0025] Figure 5 The overall structure top view schematic diagram of the embodiment of the present application;

[0026] Figure 6 The overall structure cross-sectional view schematic diagram of the embodiment of the present application;

[0027] Figure 7 The measuring needle schematic diagram of the embodiment of the present application.

[0028] BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 1, core; 2, upper insulating pad; 3, upper bearing; 4, upper support; 5, copper ring; 6, lower support; 7, lower bearing; 8, lower insulating pad; 9, fastening nail two; 10, insertion hole; 11, spring probe; 12, protective tube; 13, end fixing ring; 14, fastening nail one; 15, screw; 16, spring ejector pin; 17, hollow glass fiber; 18, SMA female head; 19, slip ring shell; 20, male needle; 21, lead wire; 22, glue filling. DETAILED DESCRIPTION

[0030] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0031] In the description of the present application, it is to be understood by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" and the like are only for the purpose of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can be explicitly or implicitly included one or more. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0032] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood through specific circumstances.

[0033] The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0034] As Figures 1 to 7 shown, a rotating conductive device with signal switching function, comprising rotating mechanism and conductive mechanism; the rotating mechanism comprises core body 1, upper insulating gasket 2, upper bearing 3, lower bearing 7, lower insulating gasket 8, end fixed ring 13, fastening nail one 14 and slip ring shell 19; the conductive mechanism comprises upper support 4, copper ring 5, lower support 6, fastening nail two 9, measuring needle, male needle 20, lead wire 21, glue filling 22, screw 15, spring ejector pin 16, hollow glass fiber 17 and SMA female head 18.

[0035] In a preferred embodiment of the present application, the upper bearing 3 and the lower bearing 7 are sleeved on the middle part of the core 1, the slip ring shell 19 is sleeved on the upper bearing 3 and the lower bearing 7, the upper insulating gasket 2 is arranged between the slip ring shell 19 and the head of the core 1, the end fixing ring 13 is arranged below the slip ring shell 19, the end fixing ring 13 is sleeved on the middle part of the core 1, and the lower insulating gasket 8 is arranged between the end fixing ring 13 and the slip ring shell 19, and the end fixing ring 13 is installed on the core 1 through the fastening nail one 14; the middle part of the core 1 is in interference fit with the upper bearing 3 and the lower bearing 7, and the slip ring shell 19 is in transition fit with the upper bearing 3 and the lower bearing 7. In this embodiment, the core 1 and the slip ring shell 19 are spaced by the insulating gasket, the slip ring shell 19 and the end fixing ring 13 are spaced by the insulating gasket, the insulating gasket mainly plays a role of wear resistance and lubrication during rotation, the middle part of the core 1 is in interference fit with the bearing and the bearing, and the slip ring shell 19 is in transition fit with the bearing and the bearing, thereby forming a mechanical structure basis for relative rotating motion between the core 1 and the slip ring shell 19, and the end fixing ring 13 is fixed on the core 1 by the fastening nail, thereby limiting the slip ring shell 19.

[0036] In a preferred embodiment of the present application, the upper support 4 and the lower support 6 are sleeved on the middle part of the core 1, the upper support 4 is arranged below the upper bearing 3 and connected with the upper bearing 3, the lower support 6 is arranged above the lower bearing 7 and connected with the lower bearing 7, the copper ring 5 is sleeved on the upper support 4 and the lower support 6, the measuring needle is inserted into the core 1, and the measuring needle is installed in the core 1 through the fastening nail two 9, the measuring needle is connected with the male needle 20 in the core 1, the male needle 20 is connected with the lead wire 21, the lead wire 21 is connected with the copper ring 5, and the male needle 20 is installed in the core 1 through the glue pouring 22; the middle part of the core 1 is in interference fit with the upper support 4 and the lower support 6; the male needle 20 is welded with the lead wire 21, and the lead wire 21 is welded with the copper ring 5. In this embodiment, the upper support 4 and the lower support 6 are installed between the upper bearing 3 and the lower bearing 7, thereby supporting the upper bearing 3 and the lower bearing 7, the copper ring 5 is sleeved on the outside of the upper support 4 and the lower support 6, thereby playing a supporting and insulating role on the copper ring 5, the measuring needle is connected with the male needle 20, the male needle 20 is connected with the lead wire 21, the lead wire 21 is connected with the copper ring 5, and the electrical connection between the measuring needle and the copper ring 5 is realized.

[0037] In a preferred embodiment of the present application, the conductive mechanism further comprises a screw 15, a spring needle 16, a hollow glass fiber 17 and an SMA female head 18, the SMA female head 18 is installed on the base of the slip ring shell 19 by the screw 15, the hollow glass fiber 17 is installed inside the base of the slip ring shell 19, the spring needle 16 is placed inside the hollow glass fiber 17, one end of the spring needle 16 is connected with the SMA female head 18, and the other end of the spring needle 16 is in contact with the copper ring 5; the hollow glass fiber 17 is in interference fit with the base of the slip ring shell 19; the SMA female head 18 is connected with the external coaxial cable. In this embodiment, different conductive mechanisms are replaced according to the bolt type, the position of the external coaxial cable is adjusted by the rotating mechanism, an insulating environment is formed inside the hollow glass fiber 17, the spring needle 16 is pressed inside the hollow glass fiber 17 by the SMA female head 18, the external coaxial cable is connected with the SMA female head 18, the SMA female head 18 is connected with the spring needle 16, the spring needle 16 is in contact with the copper ring 5, the copper ring 5 is connected with the measuring needle, the electrical connection between the external coaxial cable and the measuring needle is formed, and the tightening process does not interfere with the position of the measuring cable, thereby realizing the pre-tightening force signal switching during the tightening process and achieving the purpose of measuring the pre-tightening force.

[0038] In a preferred embodiment of the present application, the measuring needle comprises a jack 10, a spring probe 11 and a protective tube 12, the protective tube 12 is sleeved with the spring probe 11, the spring probe 11 is inserted into the jack 10, and the protective tube 12 is installed inside the core body 1 by the fastening nail 9; the spring probe 11 is in interference fit with the protective tube 12. In this embodiment, a detachable measuring needle mechanical structure is formed.

[0039] Example one: installation of automobile engine cylinder head bolt

[0040] Scenario requirement: the pre-tightening force deviation of the engine cylinder head bolt may cause the cylinder body to be not tightly sealed and oil leakage, and it is necessary to monitor the pre-tightening force in real time during the tightening process (the requirement for accuracy is ±2%).

[0041] Device adaptation: according to the cylinder head bolt type, the corresponding specification measuring needle is replaced (the length of the spring probe and the diameter of the protective tube are adjusted), to ensure accurate contact of the sensor with the bolt end face.

[0042] Operation process:

[0043] 1. Connect the present application with a tightening tool (such as an electric wrench), rotate the core body with the wrench, and fix the slip ring shell to avoid external cable winding;

[0044] 2. When the bolt is tightened, the pre-tightening force signal generated by the surface sensor is transmitted to the pre-tightening force measuring instrument through the measuring needle, the male needle, the lead, the copper ring, the spring needle and the SMA female head;

[0045] 3. The operator observes the pretightening force value in real time, and stops tightening immediately when the preset value (such as 120 N·m) is reached, to avoid overtightening or undertightening.

[0046] Beneficial effects: Compared with the traditional "post-tightening point measurement" method, the control accuracy of the pretightening force is improved to ±1.5%, and the rework rate is reduced to 4%.

[0047] Example Two: Space Rocket Fuel Tank Flange Connection

[0048] Scenario Requirements: Uneven fuel tank flange bolt pretightening force may cause fuel leakage, and it is necessary to monitor the pretightening force of each bolt in real time during rotary tightening (symmetrical synchronous tightening of multiple bolts).

[0049] Device Adaptation: Multiple copper rings and spring needles (corresponding to multiple bolts) are used, and a multi-channel data acquisition instrument is connected through an SMA female head to realize multi-signal synchronous transmission.

[0050] Operation Process:

[0051] 1. The present application is installed on a synchronous tightening device, and each bolt corresponds to a set of measuring needles and copper rings.

[0052] 2. During tightening, the signals of each group are transmitted to the data acquisition instrument through independent paths to generate real-time pretightening force curves.

[0053] 3. If the pretightening force of a certain bolt deviates from the threshold value (such as a preset 150 N·m, actual 140 N·m), the system automatically adjusts the tightening torque of that bolt until it meets the standard.

[0054] Beneficial effects: The problem of "unable to real-time calibrate single bolt pretightening force" in traditional symmetrical tightening is solved, and the flange sealing qualification rate is improved to 99%.

[0055] Example Three: To verify the advantages of the present application compared with the traditional "post-tightening point measurement" method and the traditional symmetrical tightening process, we conducted a comparative experiment, and the experimental data and results are presented as follows:

[0056] I. Experimental Objects and Conditions

[0057] In this experiment, bolts and flange assemblies of the same batch and same specifications were selected, and were divided into two groups, which were operated using the traditional method and the present application respectively. The experimental environment was kept consistent, including temperature, humidity, tool precision, etc.

[0058] II. Pretightening Force Control Accuracy and Rework Rate Comparison Experiment

[0059] 1. Experimental Process

[0060] Each group selects 100 bolts, and carries out tightening operation according to respective corresponding mode. For traditional "tightening after point measurement" mode, bolt pretightening force is detected after tightening is completed; for the application, the pretightening force is controlled in real time during tightening, and is detected after completion. The deviation value of bolt pretightening force and the number of bolts requiring rework of each group are recorded.

[0061] 2. Experimental data

[0062] ;

[0063] 3. Result analysis

[0064] From the experimental data, it can be clearly seen that the pretightening force deviation of the traditional "tightening after point measurement" mode is large, between ±5%-±8%, while the pretightening force control accuracy of the application is improved to ±1.5%, and the accuracy is significantly improved. At the same time, the rework rate of the traditional mode is 20%, and the rework rate of the application is only 4%, which greatly improves the production efficiency and reduces the production cost.

[0065] III. Comparison experiment of flange sealing qualified rate

[0066] 1. Experimental process

[0067] Each group selects 100 flange assemblies, and carries out tightening operation by using traditional symmetrical tightening process and the application respectively. After tightening is completed, the sealing performance of the flange assembly is detected, and the number of flange assemblies with qualified sealing is recorded.

[0068] 2. Experimental data

[0069] ;

[0070] 3. Result analysis

[0071] The traditional symmetrical tightening process cannot real-time calibrate single bolt pretightening force, which leads to uneven bolt pretightening force, and affects the sealing effect of the flange, and the sealing qualified rate is only 90%. The application solves this problem, and through real-time calibration of single bolt pretightening force, the sealing performance of the flange is greatly improved, and the sealing qualified rate reaches 99%, which can well meet the demand of the field with extremely high sealing requirement.

[0072] In summary, the experimental data fully verifies the significant advantages of the application in pretightening force control accuracy, reducing rework rate and improving flange sealing qualified rate.

[0073] Working principle:

[0074] The core of the application is to realize real-time switching and transmission of the pretightening force signal in the bolt tightening process by combining mechanical structure design and electrical signal transmission path, and the working principle can be divided into two levels of mechanical cooperation and signal transmission:

[0075] 1. Mechanical cooperation principle

[0076] Rotation stability guarantee: the core 1 and the upper bearing 3 and the lower bearing 7 adopt interference fit, and the slip ring shell 19 and the bearing adopt transition fit, forming the relative rotation structure of the core and the slip ring shell. The upper insulating gasket 2 and the lower insulating gasket 8 not only isolate the core and the slip ring shell, but also reduce the wear during rotation, and ensure the stability of the mechanical structure during tightening.

[0077] Part fixing and limiting: the end fixing ring 13 is fixed to the core by the fastening nail 14, limiting the axial displacement of the slip ring shell; the upper support 4 and the lower support 6 adopt interference fit with the core, supporting the copper ring 5 and assisting in fixing the position of the bearing, avoiding the loosening of the parts during rotation.

[0078] 2. Signal transmission principle

[0079] The transmission path of the pre-tightening force signal is the bolt end sensor → measuring needle → internal transmission component → external measuring device, and the specific process is as follows:

[0080] Signal acquisition: when the bolt is tightened, the sensor magnetic control sputtering sensor and the strain gauge on the surface thereof generate a pre-tightening force electric signal, and the signal is acquired through the contact of the measuring needle and the bolt sensor. The spring probe 11 in the measuring needle ensures the stable connection with the sensor through elastic contact, and the protection tube 12 avoids the damage of the probe in rotation.

[0081] Internal transmission: the measuring needle transmits the signal to the male needle 20, the male needle is connected with the copper ring 5 through the welded lead 21, and the signal transmission from the inside of the core to the copper ring is realized. The glue filling 22 fixes the relative position of the male needle and the core, preventing the signal transmission from being disturbed by vibration.

[0082] Rotation switching: when the copper ring rotates with the core, the spring ejector pin 16 on the slip ring shell 19 is always in contact with the copper ring. The elasticity of the spring ejector pin ensures close contact, and the signal is transmitted to the SMA female head 18 through the spring ejector pin. The hollow glass fiber 17 provides an insulating environment for the spring ejector pin, avoiding signal interference.

[0083] External transmission: the SMA female head is connected with the external coaxial cable, and the signal is transmitted to the pre-tightening force measuring instrument, realizing the real-time display and recording of the pre-tightening force.

[0084] The above only describes the preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A rotating electrical conductor having signal switching functionality, characterized by: It comprises rotating mechanism and conductive mechanism; the rotating mechanism comprises core body (1), upper insulating gasket (2), upper bearing (3), lower bearing (7), lower insulating gasket (8), end fixing ring (13), fastening nail one (14) and slip ring shell (19); the conductive mechanism comprises upper support (4), copper ring (5), lower support (6), fastening nail two (9), measuring needle, male needle (20), lead wire (21) and glue filling (22); The upper bearing (3) and lower bearing (7) are sleeved in the middle part of the core body (1), the slip ring shell (19) is sleeved on the upper bearing (3) and lower bearing (7), the upper insulating gasket (2) is arranged between the slip ring shell (19) and the head of the core body (1), the end fixing ring (13) is arranged below the slip ring shell (19), the end fixing ring (13) is sleeved in the middle part of the core body (1), and the lower insulating gasket (8) is arranged between the end fixing ring (13) and the slip ring shell (19), and the end fixing ring (13) is installed on the core body (1) by the fastening nail one (14). The upper support (4) and lower support (6) are sleeved in the middle part of the core body (1), the upper support (4) is arranged below the upper bearing (3) and connected with the upper bearing (3), the lower support (6) is arranged above the lower bearing (7) and connected with the lower bearing (7), the copper ring (5) is sleeved on the upper support (4) and lower support (6), the measuring needle is inserted into the core body (1), the measuring needle is installed in the core body (1) by the fastening nail two (9), the measuring needle is connected with the male needle (20) in the core body (1), the male needle (20) is connected with the lead wire (21), the lead wire (21) is connected with the copper ring (5), and the male needle (20) is installed in the core body (1) by the glue filling (22).

2. A rotating electrical conductor with signal switching function according to claim 1, characterized in that: The middle part of the core body (1) is in interference fit with the upper bearing (3) and lower bearing (7), and the slip ring shell (19) is in transition fit with the upper bearing (3) and lower bearing (7).

3. The rotating electrical conductor of claim 1, wherein: The middle part of the core body (1) is in interference fit with the upper support (4) and lower support (6).

4. The rotating electrical conductor of claim 1, further comprising: a signal relay. The male needle (20) is welded with the lead wire (21), and the lead wire (21) is welded with the copper ring (5).

5. The rotating electrical conductor of claim 1, further comprising: a signal switch. The conductive mechanism further comprises screw (15), spring ejector pin (16), hollow glass fiber (17) and SMA female head (18), the SMA female head (18) is installed on the base body of the slip ring shell (19) by the screw (15), the hollow glass fiber (17) is installed in the base body of the slip ring shell (19), the spring ejector pin (16) is arranged in the hollow glass fiber (17), one end of the spring ejector pin (16) is connected with the SMA female head (18), and the other end of the spring ejector pin (16) is in contact with the copper ring (5).

6. A rotating electrical conductor with signal switching function according to claim 5, wherein: The hollow glass fiber (17) is in interference fit with the base body of the slip ring shell (19).

7. The rotating electrical conductor of claim 1, further comprising: a signal switch. The measuring needle comprises insertion hole (10), spring probe (11) and protection tube (12), the protection tube (12) is sleeved on the spring probe (11), the spring probe (11) is inserted into the insertion hole (10), and the protection tube (12) is installed in the core body (1) by the fastening nail two (9).

8. A rotating electrical conductor with signal switching function according to claim 7, wherein: The spring probe (11) is interference fit with the protective tube (12).

9. The rotating electrical conductor of claim 5, wherein: The SMA female head (18) is connected with an external coaxial cable.

Images