Assembly fixture with stress monitoring and adjusting functions

Abstract

The invention belongs to the field of assembly of aeronautical manufacturing engineering, and relates to an assembly fixture with stress monitoring and adjusting functions. Aircraft assembly is expanded from size control to size and stress coupling control, and the assembly stress is monitored and adjusted in real time to reduce and even eliminate the assembly stress, so that the product assembly quality is improved. In the key position, the presser is replaced by the wallboard adjusting unit, one-way pressing adjustment is expanded to two-way tensioning and pressing adjustment, and the flexibility of wallboard adjustment is enhanced. The assembly fixture with the stress monitoring and adjusting functions is improved on the basis of a traditional assembly fixture, and the design, manufacturing and use cost is effectively controlled. The mechanical interfaces of the numerical control positioning unit, the intersection point measuring unit and the wallboard adjusting unit with the basic structure are respectively the same as those of a single-point positioner, an intersection point positioner and a compactor, and can be reasonably arranged according to the assembly quality requirement, so that the system complexity is prevented from being too high.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of assembly of aeronautical manufacturing engineering, and relates to an assembly jig with stress monitoring and adjusting functions, which can also be applied to the assembly tooling of other components. BACKGROUND

[0002] In traditional aircraft assembly, the assembly process control is mainly based on size control, which is generally qualitatively judged by the size of the assembly stress through the way of the plug tightness. With the large application of composite materials and the improvement of the performance requirements of the aircraft, the influence of the assembly stress on the product quality cannot be ignored. Therefore, on the basis of size control, the control of assembly stress also needs to be considered in the aircraft assembly process. At present, in the aircraft assembly process, there are challenges such as weak consistency of parts, complex assembly process and inability to quantitatively measure the assembly stress. The traditional aircraft assembly jig is basically based on a pure mechanical structure, which mainly consists of basic frame beam structure, positioner, drill jig, clamping plate and wall plate pressure closer, etc., and has low degree of electrification, and generally can only be adjusted by design and process compensation.

[0003] Chengdu Aircraft Industry (Group) Co., Ltd. proposes a modular wing surface assembly tool CN118220519A. The tool adopts a modular design concept, has multiple basic units, and realizes reconfiguration of the tool through box-type connection, thereby reducing the design and manufacturing cost of the wing surface tool and the tool preparation time. However, the tool is a pure mechanical structure and does not have the ability of automatic monitoring and adjusting of assembly stress.

[0004] China Aviation Industry Corporation Beijing Great Wall Aviation Measurement and Control Technology Research Institute proposes a adjustable weak rigid large component shape retaining tool and a support method for aircraft barrel segment CN112660412A. The support module of the tool has position and angle adjustment function. The position of the support module is adjusted by measuring the deformation of the barrel segment to realize deformation compensation of the barrel segment part, thereby reducing the assembly stress. However, the method is mainly operated by manual operation, has low degree of automation, and the specialization degree of the equipment and related technology is high, which is difficult to be used for the assembly of other parts of the aircraft.

[0005] Aviation Xi'an Aircraft Industry Group Co., Ltd. proposes a self-adaptive micro-adjustment mechanism and adjustment method for aircraft wing box segment CN115924105A. The device is composed of self-adaptive docking device, horizontal and vertical adjustment device and force sensor. When the wing box is erected, the stress state of the wing box can be judged by the force sensor, and the stress can be reduced by the horizontal and vertical adjustment device. However, the device is generally used for the overall attitude adjustment of the wing box, so as to realize the docking of the large components of the aircraft, and cannot realize the monitoring and adjusting of the assembly stress in the assembly process of the wing box itself.

[0006] Disadvantages of the prior art:

[0007] (1) The conventional assembly jig currently adopted does not have stress state monitoring capability and cannot adjust assembly stress in ways other than design and process compensation.

[0008] (2) The devices currently used for deformation or stress compensation of weakly rigid large components generally adopt pure mechanical structures and are mainly operated manually, with low automation degree and difficulty in precise adjustment.

[0009] (3) Devices with stress monitoring and adjustment functions are currently used in assembly scenarios such as large component joining and wing joining, but due to the limitations of device size and technology, the related technology has not been popularized for application in aircraft assembly stages.

[0010] (4) The stress monitoring and adjustment devices currently adopted are generally used in assembly links such as fuselage joining, and the monitoring and adjustment system has relatively low complexity. However, there are many components to be processed in the assembly stage, and the assembly process and manufacturing cost need to be considered, and the complexity of the monitoring system cannot be too high, and there is currently no related solution. SUMMARY

[0011] The present application provides an assembly jig with stress monitoring and adjustment functions.

[0012] The proposed jig is improved on the basis of the conventional assembly jig, wherein the single-point locator, intersection locator, and presser are accessories that constitute the basic unit of the conventional assembly jig. In the proposed assembly jig, the single-point locator, intersection locator, and presser are improved into numerical control positioning units, intersection measurement units, and wallboard adjustment units, which are modules with measurement and adjustment functions. During the assembly process, for parts that need to be concerned about assembly stress, the numerical control positioning unit, intersection measurement unit, and wallboard adjustment unit are respectively used to replace the single-point locator, intersection locator, and presser, thereby improving the monitoring and adjustment capability of the assembly process. At non-critical parts, the conventional single-point locator, intersection locator, and presser are still used as accessories to avoid excessive system complexity.

[0013] The proposed assembly jig with stress monitoring and adjustment functions can be divided into basic structure, numerical control positioning unit, intersection measurement unit, and wallboard adjustment unit according to the structural characteristics.

[0014] The basic structure is the basic component of the conventional assembly jig, including frame beam structure, single-point locator, intersection locator, presser, and other accessories such as drill jig and clamping plate. The frame beam structure is spliced by welding and screws, and the single-point locator, intersection locator, presser, and other accessories such as drill jig and clamping plate are installed on the frame beam structure by screws and pins.

[0015] The numerical control positioning unit is a three-axis slide table with high positioning accuracy, which is composed of three single-axis slide tables stacked together. The three movement axes of the three-axis slide table are perpendicular to each other. An end positioner is installed at the end of the numerical control positioning unit. One end of the end positioner is connected to the positioning point of the product, and the other end of the end positioner is connected to the three-dimensional force sensor on the numerical control positioning unit through screws and pins. The three-dimensional force sensor is used to measure the stress at the positioning point. Each single-axis slide table that constitutes the numerical control positioning unit uses a ball screw and a linear guide rail as a transmission mechanism. Each linear guide rail is equipped with a set of guide rail clamps to maintain the position of each movement axis. Servo motors provide power to each single-axis slide table through precision reducers. The servo motors have a brake function and are integrated with high-precision encoders. Each single-axis slide table that constitutes the numerical control positioning unit is equipped with a set of grating rulers to achieve accurate displacement control of each movement axis.

[0016] The intersection measurement unit is composed of a six-dimensional force sensor added to the original intersection positioner, which is used for real-time monitoring of three-axis force and torque at important intersection points. The intersection measurement unit does not have adjustment capability. The intersection measurement unit is composed of base A, rotating nut, rotating screw A, sensor mounting seat, six-dimensional force sensor, sensor adapter, and positioner. Base A is installed on the base structure by screws. Rotating screw A cooperates with rotating nut on base A. Rotating the rotating nut can move the rotating screw A along the axis direction. The inner hole of the sensor mounting seat cooperates with the end shaft segment of the rotating screw A and is fastened by a pin. The outer cylindrical surface of the six-dimensional force sensor is positioned by a stop and is installed on the sensor mounting seat by screws. The recess hole of the measurement surface of the six-dimensional force sensor cooperates with the boss at one end of the sensor adapter, and the sensor adapter is installed on the six-dimensional force sensor by a pin and a screw. The shaft segment at the other end of the sensor adapter cooperates with the inner hole of the positioner and is fastened by a pin.

[0017] The wall plate adjusting unit is used for pressing and tensioning the composite wall plate and monitoring the tension or pressure value applied to the wall plate. The wall plate adjusting unit is composed of a vacuum chuck, a mounting cover plate, a chuck mounting seat, an adapter flange, a tension and pressure sensor, a ball socket seat, a ball socket cover plate, a screw-in screw B and a base B. The base B is mounted on the base structure by screws. The screw-in screw B is matched with the threaded hole of the base B. The end of the screw-in screw B is a spherical surface mounted in the ball socket of the ball socket seat. The ball socket cover plate is mounted at one end of the ball socket seat by screws and encapsulates the screw-in screw B in the ball socket seat. The other end of the ball socket seat is matched with the outer circular surface of the tension and pressure sensor, and the tension and pressure sensor is fastened on the ball socket seat by screws. The boss at one end of the adapter flange is matched with the recess hole on the tension and pressure sensor, and the adapter flange is fixedly connected with the tension and pressure sensor by screws. The adapter flange is positioned with the chuck mounting seat by a stop and connected by screws. The vacuum chuck is locked on the mounting cover plate by a nut, and the mounting cover plate is mounted on the chuck mounting seat by screws. In the assembly operation, a plurality of wall plate adjusting units are generally combined into an array to more accurately regulate and control the shape of the wall plate and the assembly stress.

[0018] According to one aspect of the present application, a mounting jig with stress monitoring and adjusting function is provided, which is composed of a base structure 100, a numerical control positioning unit 200, an intersection measuring unit 300 and a wall plate adjusting unit 400.

[0019] The base structure 100 includes a frame beam structure 101, a single-point positioner 102, an intersection positioner 103, a presser 104, a drill jig and a clamping plate and other accessories 105.

[0020] The frame beam structure 101 is formed by welding, screw connection and pin connection, etc.

[0021] The single-point positioner 102, the intersection positioner 103 and the presser 104 can be used for non-critical parts that do not need stress monitoring or adjusting.

[0022] The numerical control positioning unit 200, the intersection measuring unit 300 and the wall plate adjusting unit 400 have the same mechanical interface as the single-point positioner 102, the intersection positioner 103 and the presser 104 respectively, and can be flexibly configured according to requirements.

[0023] The numerical control positioning unit 200 mainly realizes the positioning of the critical parts on the product that need stress monitoring and adjusting.

[0024] The basic configuration of the numerical control positioning unit 200 is a three-axis sliding table, and the three movement axes of the three-axis sliding table are perpendicular to each other and are stacked by three single-axis sliding tables.

[0025] The numerical control positioning unit 200 includes an end positioner 201, a three-dimensional force sensor 202, an end slide 203, a guide rail clamp 204, a ball screw 205, a linear guide rail 206, a precision reducer 207, a servo motor 208, and a grating ruler 209.

[0026] One side of the end positioner 201 is fixed on the three-dimensional force sensor 202 through a screw and a pin, and the other end is connected with a positioning hole on the product through a pin; during assembly, the numerical control positioning unit 200 can monitor the stress value at the connected positioning point, and can fine-tune the position of the end positioner 201 within a tolerance range to release the assembly stress;

[0027] The three-dimensional force sensor 202 is installed on the end slide 203 of the numerical control positioning unit 200 to monitor the stress at the positioning point as one of the assembly stress judgment inputs, and the adjustment range of the numerical control positioning unit 200 is limited by the measured stress value to avoid excessive adjustment and damage to the product;

[0028] The transmission mechanism of each single-axis slide table of the numerical control positioning unit 200 adopts a ball screw 205 and a linear guide rail 206, and each linear guide rail 206 is equipped with a guide rail clamp 204 to realize the position keeping of each movement axis of the numerical control positioning unit 200;

[0029] Each movement axis adopts a servo motor 208 as a power source through a precision reducer 207, and the servo motor 208 has a brake function and integrates a high-precision encoder;

[0030] Each single-axis slide table is equipped with a set of grating rulers 209 to realize the position control of each movement axis.

[0031] The intersection measurement unit 300 includes a base A 301, a screw-in nut 302, a screw-in screw A 303, a sensor mounting seat 304, a six-dimensional force sensor 305, a sensor adapter 306, and a positioner 307.

[0032] The intersection measurement unit 300 is used for stress monitoring at an important intersection that has a greater impact on assembly quality, and can monitor the three-axis force and the three-axis torque around the intersection, and the intersection measurement unit 300 does not have adjustment capability.

[0033] The base A 301 is installed on the base structure 100 through a screw, the screw-in nut 302 is installed on the base A 301 through a sliding groove, the screw-in screw A 303 cooperates with the threaded hole of the screw-in nut 302, and the screw-in screw A 303 can be moved along the axis direction by rotating the screw-in nut 302;

[0034] The inner hole of the sensor mounting seat 304 cooperates with the end shaft segment of the screw-in screw A 303, and is fastened by a pin;

[0035] The outer cylindrical surface of the six-dimensional force sensor 305 is positioned by a shoulder, and the six-dimensional force sensor 305 is fastened on the sensor mounting seat 304 by screws;

[0036] The end boss of the sensor adapter 306 is matched with the recess of the measuring surface of the six-dimensional force sensor 305, and the sensor adapter 306 is fastened on the six-dimensional force sensor 305 by a pin and screws;

[0037] The inner hole of the positioner 307 is matched with the shaft section at one end of the sensor adapter 306, and is positioned and fastened by a pin.

[0038] The wall plate adjusting unit 400 is used to compress or tighten the composite wall plate;

[0039] The wall plate adjusting unit 400 includes a vacuum chuck 401, a mounting cover plate 402, a chuck mounting seat 403, an adapter flange 404, a tension and compression force sensor 405, a ball socket 406, a ball socket cover plate 407, a screw-in screw B 408, and a base B 409.

[0040] The base B 409 is mounted on the base structure 100 by screws;

[0041] The screw-in screw B 408 is matched with the threaded hole on the base B 409, the end of the screw-in screw B 408 is spherical, and is installed in the ball socket 406;

[0042] The ball socket cover plate 407 is installed at one end of the ball socket 406 by screws, and the spherical end of the screw-in screw B 408 is encapsulated inside the ball socket 406;

[0043] The tension and compression force sensor 405 is positioned by a shoulder at the end of the ball socket 406, and is fixed on the ball socket 406 by screws;

[0044] The end boss of the adapter flange 404 is matched with the recess on the tension and compression force sensor 405, and is connected with the tension and compression force sensor 405 by screws;

[0045] The chuck mounting seat 403 and the adapter flange 404 are positioned by a shoulder, and are fastened by screws;

[0046] The end of the vacuum chuck 401 is locked on the mounting cover plate 402 by a nut, and the mounting cover plate 402 is installed on one side of the chuck mounting seat 403 by screws;

[0047] A certain space is left inside the chuck mounting seat 403 to provide a buffer stroke for the vacuum chuck 401;

[0048] In the assembly operation, multiple wall plate adjusting units 400 are constructed into an array to achieve accurate adjustment of the composite wall plate deformation and stress;

[0049] In the assembly operation, the high-pressure gas source in the factory drives the vacuum generator to extract air in the vacuum chuck 401, and the vacuum chuck 401 is controlled by the electromagnetic valve to suck the composite wall plate.

[0050] It also includes an electrical control system;

[0051] The electrical control system includes a servo driver, an industrial acquisition card, a PLC controller, an industrial switch and an industrial computer, and each component communicates through Internet or EtherCAT bus.

[0052] The beneficial effects of the present application are:

[0053] (1) The aircraft assembly is expanded from size control to size and stress coupling control, which realizes real-time monitoring and adjustment of assembly stress, reduces or even eliminates assembly stress, and further improves product assembly quality.

[0054] (2) The single-point positioner at the key positioning point is replaced by a numerical control positioning unit, which realizes stress monitoring and position fine adjustment of the positioning point, and the three movement axes of the numerical control positioning unit have a large stroke range and have a certain flexibility.

[0055] (3) The presser at the key position is replaced by a wall plate adjusting unit, which expands the one-way pressing adjustment to bidirectional tensioning and pressing adjustment, and enhances the flexibility of wall plate adjustment.

[0056] (5) The proposed assembly jig with stress monitoring and adjustment function is improved on the basis of the traditional assembly jig, which effectively controls the design, manufacturing and use cost.

[0057] (6) The mechanical interfaces of the designed numerical control positioning unit, intersection measuring unit and wall plate adjusting unit with the base structure are the same as those of the single-point positioner, intersection positioner and presser, respectively, which can be reasonably arranged according to the assembly quality requirements to avoid high system complexity. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 It is a schematic diagram of an assembly jig with stress monitoring and adjustment function.

[0059] Figure 2 It is a partial enlarged view I of the schematic diagram of the assembly jig with stress monitoring and adjustment function.

[0060] Figure 3 It is a partial enlarged view II of the schematic diagram of the assembly jig with stress monitoring and adjustment function.

[0061] Figure 4 Structure diagram of numerical control positioning unit.

[0062] Figure 5 Structure diagram of intersection measurement unit.

[0063] Figure 6 Structure diagram of intersection measurement unit.

[0064] Figure 7 Structure diagram of wallboard adjusting unit.

[0065] Figure 8 Structure diagram of wallboard adjusting unit.

[0066] Figure 9 Structure diagram of wallboard adjusting unit.

[0067] Figure 10 Structure diagram of single-point positioning unit.

[0068] Figure 11 Structure diagram of intersection positioning unit.

[0069] Figure 12 Structure diagram of presser unit.

[0070] Figure 13 Structure diagram of electrical control system of assembly jig with stress monitoring and adjusting functions.

[0071] Figure 14 Structure diagram of working process of assembly jig with stress monitoring and adjusting functions.

[0072] Wherein, 100 base structure, 200 numerical control positioning unit, 300 intersection measurement unit, 400 wallboard adjusting unit, 101 frame beam structure, 102 single-point positioning unit, 103 intersection positioning unit, 104 presser unit, 105 drill jig and clamping plate and other accessories, 201 end positioning unit, 202 three-dimensional force sensor, 203 end slide, 204 guide rail clamp, 205 ball screw, 206 linear guide rail, 207 precision reducer, 208 servo motor, 209 grating ruler, 301 base A, 302 screw-in nut, 303 screw-in screw A, 304 sensor mounting seat, 305 six-dimensional force sensor, 306 sensor adapter, 307 positioning unit, 401 vacuum chuck, 402 mounting cover plate, 403 chuck mounting seat, 404 adapter flange, 405 tension and pressure sensor, 406 ball socket, 407 ball socket cover plate, 408 screw-in screw B, 409 base B. DETAILED DESCRIPTION

[0073] The present application will be described in detail below with reference to examples, but the present application is not limited to these examples.

[0074] Example 1

[0075] Referring to Figure 1 and Figure 3 , the assembly jig with stress monitoring and adjusting function is improved on the basis of traditional assembly jig, including four parts of base structure 100, numerical control positioning unit 200, intersection measuring unit 300, wallboard adjusting unit 400, etc.

[0076] Referring to Figure 1 , Figure 2 , Figure 10 , Figure 11 and Figure 12 , the base structure 100 includes frame beam structure 101, single-point positioner 102, intersection positioner 103, presser 104, and other accessories 105 such as drill jig and clamping plate. The frame beam structure 101 is formed by welding, screw connection, pin connection, etc. Among them, the single-point positioner 102, the intersection positioner 103, and the presser 104 can be used for non-critical parts that do not need to be monitored or adjusted for stress. The numerical control positioning unit 200, the intersection measuring unit 300, and the wallboard adjusting unit 400 have the same mechanical interface as the single-point positioner 102, the intersection positioner 103, and the presser 104, respectively, and can be flexibly configured according to requirements.

[0077] Referring to Figure 4 , the numerical control positioning unit 200 mainly realizes the positioning of the critical parts on the product that need to be monitored and adjusted for stress. The basic configuration of the numerical control positioning unit 200 is a three-axis sliding table, and the three movement axes of the three-axis sliding table are perpendicular to each other and stacked by three single-axis sliding tables. In the assembly operation, the numerical control positioning unit 200 can monitor the stress value at the connected positioning point and can fine-tune the position of the end positioner 201 within the tolerance range to release the assembly stress. A three-dimensional force sensor 202 is installed on the end slide 203 of the numerical control positioning unit 200 to monitor the stress at the positioning point as one of the inputs for judging the assembly stress, and the adjustment range of the numerical control positioning unit 200 is limited by the measured stress value to avoid excessive adjustment and damage to the product. One side of the end positioner 201 is fixed on the three-dimensional force sensor 202 through screws and pins, and the other end is connected with the positioning hole on the product through a latch. The transmission mechanism of each single-axis sliding table of the numerical control positioning unit 200 adopts a ball screw 205 and a linear guide rail 206, and each linear guide rail 206 is equipped with a guide rail clamp 204 to realize the position keeping of each movement axis of the numerical control positioning unit 200. Each movement axis adopts a servo motor 208 as a power source through a precision reducer 207, and the servo motor 208 has a brake function and integrates a high-precision encoder. Each single-axis sliding table is equipped with a set of grating ruler 209 to realize the position control of each movement axis.

[0078] Referring to Figure 5 and Figure 6The intersection measuring unit 300 is used for stress monitoring at important intersections which have great influence on assembly quality, and can monitor three-axis force and three-axis torque at the intersections. The intersection measuring unit 300 does not have adjustment capability. The intersection measuring unit 300 mainly consists of a base A 301, a screw-in nut 302, a screw-in screw A 303, a sensor mounting seat 304, a six-dimensional force sensor 305, a sensor adapter 306, and a positioner 307. The base A 301 is installed on the base structure 100 by screws, the screw-in nut 302 is installed on the base A 301 by a sliding groove, the screw-in screw A 303 cooperates with the threaded hole of the screw-in nut 302, and the screw-in screw A 303 can move along its own axis direction by rotating the screw-in nut 302. The inner hole of the sensor mounting seat 304 cooperates with the end shaft segment of the screw-in screw A 303, and is fastened by a pin. The outer cylindrical surface of the six-dimensional force sensor 305 cooperates with the sensor mounting seat 304 by a stop position, and the six-dimensional force sensor 305 is fastened on the sensor mounting seat 304 by screws. The end boss of the sensor adapter 306 cooperates with the recess hole of the measuring surface of the six-dimensional force sensor 305, and the sensor adapter 306 is fastened on the six-dimensional force sensor 305 by a pin and screws. The inner hole of the positioner 307 cooperates with the one end shaft segment of the sensor adapter 306, and is positioned and fastened by a pin.

[0079] Referring to Figure 7 , Figure 8 and Figure 9The wall plate adjusting unit 400 is used to compress or tighten the composite wall plate. The wall plate adjusting unit 400 mainly consists of a vacuum chuck 401, a mounting cover plate 402, a chuck mounting seat 403, an adapter flange 404, a tension and compression force sensor 405, a ball socket seat 406, a ball socket cover plate 407, a ball screw B 408, and a base B 409. The base B 409 is mounted on the base structure 100 by screws. The ball screw B 408 is matched with the threaded hole on the base B 409, the end of the ball screw B 408 is spherical, and is installed in the ball socket seat 406. The ball socket cover plate 407 is mounted on one end of the ball socket seat 406 by screws, and encapsulates the spherical end of the ball screw B 408 inside the ball socket seat 406. The tension and compression force sensor 405 is positioned at the end of the ball socket seat 406 by a stop, and is fixed on the ball socket seat 406 by screws. The adapter flange 404 is matched with the recess on the tension and compression force sensor 405 by a boss at one end, and is connected with the tension and compression force sensor 405 by screws. The chuck mounting seat 403 is positioned between the adapter flange 404 by a stop, and is fastened by screws. The end of the vacuum chuck 401 is locked on the mounting cover plate 402 by a nut, and the mounting cover plate 402 is mounted on one side of the chuck mounting seat 403 by screws. A certain space is left inside the chuck mounting seat 403 to provide a buffer stroke for the vacuum chuck 401. In the assembly operation, multiple sets of wall plate adjusting units 400 are constructed into an array to realize accurate adjustment of the deformation and stress of the composite wall plate. In the assembly operation, the air in the vacuum chuck 401 is extracted by a vacuum generator driven by a high-pressure gas source in the factory building, and the suction of the vacuum chuck 401 to the composite wall plate is controlled by a solenoid valve.

[0080] Referring to Figure 13 The electrical control system of the assembly jig with stress monitoring and adjusting functions includes a servo driver, an industrial acquisition card, a PLC controller, an industrial switch, and an industrial computer, and the like, and each component part realizes communication through Internet or EtherCAT bus. The servo motor 208 and the grating ruler 209 of each single-axis sliding table constituting the numerical control positioning unit 200 are connected with one servo driver, and multiple servo drivers are controlled by the PLC-1. The PLC-1 is connected to the industrial computer through the industrial switch. The PLC-2 controls the solenoid valve to realize the suction and release of the vacuum chuck 401 on the wall plate adjusting unit 400, and is connected to the industrial computer through the industrial switch. The six-dimensional force sensor 305, the three-dimensional force sensor 202, and the tension and compression force sensor 405 are connected to the industrial computer through the acquisition card.

[0081] Referring to Figure 14The assembly jig workflow with stress monitoring and adjusting function is as follows: after starting the assembly work, the assembly jig electrical system is started and self-checking is started, the numerical control positioning unit 200, the intersection measuring unit 300 and the wall plate adjusting unit 400 are in the theoretical position and initial state. After the self-checking is passed, the work is started according to the assembly process procedure. When the assembly of the position needing accurate control of stress is started, the three-dimensional force sensor 202, the six-dimensional force sensor 305 and the tension and compression force sensor 405 transmit the measured values to the industrial computer. After the calculation, the industrial computer judges whether the stress meets the quality requirements. If not, the numerical control positioning unit 200 makes fine adjustment within the tolerance range, and the screw-in screw B408 of the wall plate adjusting unit 400 is rotated until the assembly stress meets the standard. After the assembly of all components is completed according to the workflow, the assembly work is ended.

[0082] The above merely describes the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can make several modifications or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An assembly jig with stress monitoring and regulation functions, characterized in that: It consists of a basic structure (100), a numerical control positioning unit (200), an intersection measurement unit (300), and a wall panel adjustment unit (400).

2. The assembly jig with stress monitoring and regulation function according to claim 1, characterized in that: The basic structure (100) includes a frame beam structure (101), a single point locator (102), an intersection locator (103), a presser (104), a drilling template, a clamping plate and other accessories (105).

3. The assembly jig with stress monitoring and regulation function according to claim 2, characterized in that: The frame beam structure (101) is constructed by welding, screw connection, pin connection, etc. The single point locator (102), intersection point locator (103), and presser (104) can be used for non-critical parts that do not require stress monitoring or adjustment; The numerical control positioning unit (200), the intersection point measurement unit (300), and the wall panel adjustment unit (400) respectively have the same mechanical interfaces with the single point positioner (102), the intersection point positioner (103), and the presser (104), and can be flexibly configured according to requirements.

4. The assembly jig with stress monitoring and regulation function according to claim 1, characterized in that: The numerical control positioning unit (200) mainly realizes the positioning of key parts on the product that require stress monitoring and adjustment; The basic configuration of the numerical control positioning unit (200) is a three-axis slide, wherein the three motion axes constituting the three-axis slide are perpendicular to each other and are formed by stacking three single-axis slides; The numerical control positioning unit (200) comprises an end positioner (201), a three-dimensional force sensor (202), an end slide (203), a guide rail clamp (204), a ball screw (205), a linear guide rail (206), a precision reducer (207), a servo motor (208), and a grating ruler (209).

5. The assembly jig with stress monitoring and regulation function according to claim 4, characterized in that: One end of the end positioner (201) is fixed to the three-dimensional force sensor (202) by screws and pins, and the other end is connected to the positioning hole on the product by a pin; during the assembly operation, the numerical control positioning unit (200) can monitor the stress value at the connection positioning point and can fine-tune the position of the end positioner (201) within the tolerance range to release the assembly stress; A three-dimensional force sensor (202) is installed on the end slide (203) of the numerical control positioning unit (200) to monitor the stress at the positioning point as one of the assembly stress evaluation inputs. The measured stress value is used to limit the adjustment range of the numerical control positioning unit (200) to avoid damage to the product due to over-adjustment. The transmission mechanism of each single-axis slide constituting the numerical control positioning unit (200) adopts a ball screw (205) and a linear guide rail (206), and each linear guide rail (206) is equipped with a guide rail clamp (204) to achieve position maintenance of each motion axis of the numerical control positioning unit (200); Each motion axis uses a servo motor (208) as a power source through a precision reducer (207), and the servo motor (208) has a brake function and is integrated with a high-precision encoder; Each single-axis slide is equipped with a set of grating rulers (209) to achieve position control of each motion axis.

6. The assembly jig with stress monitoring and regulation function according to claim 1, characterized in that: The intersection measurement unit (300) includes a base A (301), a screw-in nut (302), a screw-in screw A (303), a sensor mounting base (304), a six-dimensional force sensor (305), a sensor adapter (306), and a positioner (307); The intersection measurement unit (300) is used for monitoring stress at important intersections that have a greater impact on assembly quality, and can monitor the triaxial forces and moments around the triaxial forces at the intersections. No adjustment capability.

7. The assembly jig with stress monitoring and regulation function according to claim 6, characterized in that: The base A (301) is mounted on the base structure (100) by screws, the screw-in nut (302) is mounted on the base A (301) through a slide groove, the screw-in screw rod A (303) cooperates with the threaded hole of the screw-in nut (302), and the screw-in screw rod A (303) can be moved along its own axis by rotating the screw-in nut (302); The inner hole of the sensor mounting seat (304) is matched with the end shaft section of the screw rod A (303) and is fastened by a pin; The outer cylindrical surface of the six-dimensional force sensor (305) and the sensor mounting seat (304) are positioned using stoppers, and the six-dimensional force sensor (305) is fastened to the sensor mounting seat (304) by screws; The end boss of the sensor adapter (306) is matched with the concave hole of the measuring surface of the six-dimensional force sensor (305), and the sensor adapter (306) is fastened to the six-dimensional force sensor (305) by pins and screws; The inner hole of the positioner (307) is matched with the shaft section at one end of the sensor adapter (306) and is positioned and fastened by a pin.

8. The assembly jig with stress monitoring and regulation functions according to claim 1, characterized in that: The wall panel adjustment unit (400) is used to compress or tighten the composite wall panel; The wall panel adjustment unit (400) includes a vacuum suction cup (401), a mounting cover (402), a suction cup mounting seat (403), an adapter flange (404), a tension and pressure sensor (405), a ball socket seat (406), a ball socket cover (407), a screw-in screw B (408) and a base B (409).

9. The assembly jig with stress monitoring and regulation function according to claim 8, characterized in that: The base B (409) is mounted on the base structure (100) by screws; The screw rod B (408) is matched with the threaded hole on the base B (409), and the end of the screw rod B (408) is spherical and is installed in the ball socket (406); The socket cover plate (407) is mounted on one end of the socket seat (406) by means of screws, and the spherical end of the screw rod B (408) is encapsulated inside the socket seat (406); The tension and pressure sensor (405) and the end of the ball and socket seat (406) are positioned through a stopper, and the tension and pressure sensor (405) is fixed to the ball and socket seat (406) with screws; The boss at one end of the adapter flange (404) is matched with the concave hole on the tension and pressure sensor (405) and is connected to the tension and pressure sensor (405) via screws; The suction cup mounting seat (403) and the adapter flange (404) are positioned by a stopper and fastened by screws; The end of the vacuum suction cup (401) is locked on the installation cover (402) by a nut, and the installation cover (402) is installed on one side of the suction cup mounting seat (403) by screws; A certain space is left inside the suction cup mounting seat (403) to provide a buffer stroke for the vacuum suction cup (401); During assembly, multiple sets of wall panel adjustment units (400) are constructed into an array to achieve precise adjustment of deformation and stress of the composite wall panel; During the assembly operation, the vacuum generator is driven by the high-pressure air source in the factory to extract the air in the vacuum suction cup (401), and the suction of the vacuum suction cup (401) to the composite wall panel is controlled by the electromagnetic valve.

10. The assembly jig with stress monitoring and regulation functions according to claim 1, characterized in that: It also includes an electrical control system; The electrical control system includes a servo drive, an industrial acquisition card, a PLC controller, an industrial switch and an industrial computer, and each component communicates via the Internet or an EtherCAT bus.

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