ASAAC Module Dimension Measuring Device and Method Using an LRM Connector

Abstract

The present invention provides a device and method for measuring the size of an ASAAC module using an LRM connector, belonging to the technical field of special module measurement, and solving the difficult problems in the process of measuring the key dimensions of modules by existing measurement technologies; it includes a base, and a reference positioning mechanism and a sliding measurement mechanism are respectively arranged on the front and rear sides of the base. The measurement device has a positioning groove for accommodating the ribs of the module to be measured; the reference positioning mechanism enables the module to be measured to slide and insert along a first direction and be positioned and locked in the measurement device, and the sliding measurement mechanism enables a high-precision digital vernier caliper to slide along a second direction, and the second direction is perpendicular to the first direction; a reference surface is also arranged on one side of the base close to the reference positioning mechanism. When the module to be measured is inserted into the measurement device and locked, the LRM plug guide pin of the module to be measured and the reference surface are jointly located in the measurement plane formed by the movement of the vernier caliper jaws along the second direction and the vertical direction, so that the key dimensions of the module to be measured can be accurately measured.

Description

Technical Field

[0001] The present invention belongs to the technical field of dedicated module measurement, and particularly relates to a size measurement device and method for an ASAAC module applying an LRM connector. Background Art

[0002] With the development of electronic technology, avionics equipment is also developing towards the direction of integration, miniaturization and standardization. Avionics chassis and module products based on the integrated modular design concept have also developed to the latest generation. Electronic chassis and module products based on the ASAAC (Allied Standard Avionics Architecture Council) standard, that is, the standard avionics architecture council standard, have been widely used in the fields of avionics, communication and radar.

[0003] The LRM (Line Replaceable Module) series of modular connectors includes a plug and a socket. The plug has guide pins and is usually installed on the module; the socket has guide pin holes and is usually installed on the printed circuit board backplane of the chassis. The LRM series of modular connectors is composed of a metal shell, an optical module, a differential module, a radio frequency module, etc. The guide pins and guide pin holes are both on the metal shell.

[0004] During the process of inserting the module into the chassis, the positioning reference surface of the module fits against the side of the slot in the chassis. The module is inserted into the chassis from front to back along the slot direction. The guide pins on the module plug first enter the guide pin holes of the socket on the chassis backplane. Press the extractor, and the guide pins of the module plug further enter. Then, the optical module, differential module, radio frequency module, etc. on the plug also enter the socket. After tightening the locking strip, the module is completely fixed in the chassis. During this process, if the distance between the center of the guide pin of the LRM connector and the rib reference surface of the module completely meets the design requirements, the plug and the socket can be perfectly matched. However, if this distance dimension on the module is too large, after insertion, the front part of the module will be deflected to the left (taking the vertical module as an example, with the locking strip on the right side). If the locking strip is tightened at this time, relative forces will be generated between the plug and the socket and between the plug and the module printed circuit board. The force is proportional to the difference in the distance dimension. The greater the dimension difference, the greater the force. On the contrary, if this distance dimension on the module is too small, after insertion, the front part of the module will be deflected to the right, also resulting in the generation of the above-mentioned forces. At the same time, if the dimension difference is too large, the guide pin cannot enter the guide pin hole of the socket at all.

[0005] Therefore, the distance between the center of the guide pin of the LRM connector and the rib reference surface of the module is a particularly important dimensional data that determines whether the module can be correctly inserted into the chassis backplane, and it can be defined as a key dimension. This dimension not only relates to the smooth insertion of the module, but also relates to the normal force and long-term reliability between the plug and the socket.

[0006] In the actual design and production process, the accuracy requirements for the position of the external LRM connector are very high. However, due to various reasons such as design errors and inconsistent machining references, the accumulation of component assembly tolerances may occur, resulting in the problem that the positioning dimension accuracy after assembly exceeds the design requirements. Once this problem occurs, it is usually only discovered when the module is inserted into the rack, delaying the discovery and solution of the problem, and the assembly process is time-consuming and laborious, thus greatly affecting production efficiency.

[0007] Since the vertical distance between the module rib plane and the center line of the LRM connector guide pin is a non-planar one-dimensional dimension, it is very difficult to measure it with existing conventional measuring tools such as vernier calipers and micrometers, and it is difficult to ensure whether it is a vertical relationship during the measurement process, resulting in the inability to guarantee the dimension accuracy. If a coordinate measuring machine is used, although it can be measured, there are still limitations such as high process costs, slow measurement speed, and inconvenient operation. Summary of the Invention

[0008] The purpose of the present invention is to provide a dedicated measuring device and measuring method to solve the dimensional accuracy problems that occur during the assembly process of the ASAAC module using the LRM connector in the background technology, and at the same time improve many limitations in the existing measuring technology during the measurement process; by changing the key dimension of the distance between the center line of the guide pin of the LRM connector and the reference plane of the module rib from a non-planar dimension to a planar dimension, and cooperating with a digital height vernier caliper, the present invention realizes a fast and accurate measurement process, thereby improving the module assembly efficiency.

[0009] The present invention adopts the following technical solutions to achieve the purpose:

[0010] An ASAAC module dimension measuring device using an LRM connector includes a base, and a reference positioning mechanism and a sliding measuring mechanism are respectively arranged on the front and rear sides of the base; a positioning groove is formed at the connection between the reference positioning mechanism and the base, and the positioning groove is used to accommodate the rib of the measured module and also provide a space for expanding and clamping the locking strip of the measured module; the reference positioning mechanism is used to slide the measured module along the first direction and insert and lock it in the measuring device; the sliding measuring mechanism includes a digital height vernier caliper, and the sliding measuring mechanism is used to slide the digital height vernier caliper along the second direction. Both the first direction and the second direction are horizontal directions, and the second direction is perpendicular to the first direction; a reference plane is also arranged on one side of the base close to the reference positioning mechanism. When the measured module is inserted into the measuring device and locked, the LRM plug guide pin of the measured module and the reference plane are jointly covered by the measuring plane formed by the movement of the sliding jaws of the digital height vernier caliper along the second direction and the vertical direction.

[0011] Preferably, the reference positioning mechanism includes a left side plate and a right side plate, both of which are connected to the base, and left and right positioning grooves are formed at the connection points respectively for accommodating the left and right ribs of the measured module; the bottom surfaces of the left and right positioning grooves are at the same height provided by the base, and the side surfaces and top surfaces of the left and right positioning grooves are provided by the corresponding left and right side plates.

[0012] Further, when the measured module is inserted into the measuring device and locked, the lower surfaces of the left and right ribs of the measured module are in contact with the bottom surfaces of the corresponding left and right positioning grooves.

[0013] Preferably, the number of the reference planes is two, and the two reference planes are respectively arranged corresponding to the positions of the left side plate and the right side plate; the plane heights of the two reference planes are both higher than the bottom surface height of the left and right positioning grooves, and the plane heights of the two reference planes are different from each other. The vertical height between the reference plane and the bottom surface of the left and right positioning grooves is equal to the radius of the corresponding LRM plug guide pin.

[0014] Specifically, the reference plane includes a right reference plane, which is arranged corresponding to the position of the right side plate; the plane height of the right reference plane is 1.6 mm higher than the bottom surface height of the left and right positioning grooves. The right reference plane is used to provide zero calibration for the sliding jaws of the vernier caliper when measuring the LRM plug guide pin with a diameter of 3.2 mm.

[0015] Specifically, the reference plane further includes a left reference plane, which is arranged corresponding to the position of the left side plate; the plane height of the left reference plane is 1.75 mm higher than the bottom surface height of the left and right positioning grooves. The left reference plane is used to provide zero calibration for the sliding jaws of the vernier caliper when measuring the LRM plug guide pin with a diameter of 3.5 mm; the lower surface of the sliding jaws is in a parallel plane relationship with the left reference plane and the right reference plane.

[0016] Preferably, the sliding measurement mechanism further includes a wedge-shaped slider and two wedge-shaped stoppers, and the two wedge-shaped stoppers are arranged on the base; the two wedge-shaped stoppers are arranged in parallel, and a chute space for the wedge-shaped slider to slide in the second direction is formed between the wedge-shaped stoppers; the height digital vernier caliper is installed on the wedge-shaped slider.

[0017] The present invention also provides a method for measuring the size of an ASAAC module applying an LRM connector. By using the above-mentioned size measuring device, the method includes the following steps:

[0018] S1. Insert the left and right ribs of the measured module into the measuring device along the left and right positioning grooves;

[0019] S2. After insertion in place, spread the locking strip of the measured module and clamp it tightly in the positioning groove. At this time, ensure that the lower surfaces of the left and right ribs of the measured module are in contact with the bottom surfaces of the corresponding left and right positioning grooves;

[0020] S3. Select the corresponding reference plane on the measuring device according to the type of LRM plug guide pin on the measured module;

[0021] S4. Move the wedge-shaped slider to the position corresponding to the reference plane, and operate the height digital display vernier caliper on the wedge-shaped slider to make the lower surface of the scribing claw contact the reference plane for zero calibration;

[0022] S5. Move the wedge-shaped slider to the position corresponding to the LRM plug guide pin on the measured module, and operate the height digital display vernier caliper on the wedge-shaped slider to make the lower surface of the scribing claw contact the upper vertex of the cylindrical surface circumference of the LRM plug guide pin, read the measurement value at this time, and obtain the measurement result.

[0023] Specifically, in S3, the types of LRM plug guide pins on the measured module are divided according to the diameter of the LRM plug guide pin. The diameters of the LRM plug guide pins include 3.2 mm and 3.5 mm; in S5, the number of LRM plug guide pins on the measured module is multiple. Move the wedge-shaped slider and the scribing claw, and read the size measurement values corresponding to each LRM plug guide pin respectively to jointly form the measurement result.

[0024] Specifically, when the measured module has an LRM plug guide pin with a diameter of 3.2 mm, select the reference plane with a height of 1.6 mm on the measuring device; when the measured module has an LRM plug guide pin with a diameter of 3.5 mm, select the reference plane with a height of 1.75 mm on the measuring device; where the height of the reference plane is the vertical distance between the plane where the reference plane is located and the plane where the bottom surfaces of the left and right positioning grooves are located.

[0025] In summary, due to the adoption of this technical solution, the beneficial effects of the present invention are as follows:

[0026] In the present invention, the measured module is installed in the measuring device. The lower scribing surface of the scribing claw of the height digital display vernier caliper can be used to contact the reference plane for zeroing, and then slide to contact the upper vertex of the cylindrical surface circumference of the LRM plug guide pin of the measured module. At this time, the display value of the height digital display vernier caliper is the measured value of the key dimension, and it can be judged whether the dimension accuracy meets the assembly requirements. The present invention changes the measurement process of the key dimension from the measurement of non-planar dimensions to the measurement of planar dimensions, and has the characteristics of high precision, fast speed, simple operation, no need for calculation, simple structure and low device cost, and can improve the module assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall schematic diagram of the rear end side of the module dimension measuring device;

[0028] Figure 2 Overall schematic diagram of the front end side of the module size measuring device;

[0029] Figure 3 Schematic diagram of the external structure of the measured module;

[0030] Figure 4 Schematic diagram of the external structure of the rear end side of the module size measuring device;

[0031] Figure 5 Schematic diagram of the external structure of the front end side of the module size measuring device;

[0032] Figure 6 For Figure 4 Enlarged view of the circular area B in;

[0033] Figure 7 For Figure 4 Enlarged view of the circular area C in.

[0034] The meanings represented by the marks in the attached drawings are specifically as follows:

[0035] 1 - Measuring device, 2 - Measured module, 101 - High - precision digital vernier caliper, 102 - Wedge - shaped slider, 103 - Wedge - shaped stop block, 104 - Base, 105 - Right side plate, 106 - Left side plate, 107 - Scratching claw, 201 - LRM plug guide pin, 202 - Rib, 203 - Locking strip. Specific implementation manners

[0036] To make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0038] Here, the measurement purposes and problems existing in the prior - art measurement process are introduced, as well as the detailed situation of the ASAAC module measured in the specific implementation manners. As Figure 3 shown, Figure 3The dimension of 14.4±0.1mm marked in the figure is the standard vertical distance between the rib plane of the module under test 2 and the center line of the guide pin of the LRM connector. This distance is a non-planar one-dimensional dimension. Existing conventional measuring tools, such as vernier calipers and micrometers, are difficult to measure directly to meet the stringent accuracy requirements. Even if a vernier caliper is used at a certain tilt angle, with one foot touching the rib positioning surface and the other foot touching the outer cylindrical surface of the guide pin, it is difficult to ensure that it is a vertical relationship, and the dimensional accuracy cannot be guaranteed. Although measurement can be performed using a three-coordinate measuring instrument, it has disadvantages such as high cost, slow measurement, and inconvenience. Therefore, the present invention adopts a measuring device and method to achieve a precise measurement process.

[0039] Example 1

[0040] like Figures 1 to 7 As shown, an ASAAC module size measuring device using an LRM connector includes a base 104, and a reference positioning mechanism and a sliding measuring mechanism are respectively provided on the front and rear sides of the base 104; a positioning groove is formed at the connection between the reference positioning mechanism and the base 104, and the positioning groove is used to accommodate the rib 202 of the module under test 2 and also to provide space for the locking bar 203 of the module under test 2 to be stretched and clamped.

[0041] The reference positioning mechanism is used to slide the module under test 2 along a first direction and position and lock it in the measuring device. In this embodiment, the module under test 2 is inserted from the front side of the measuring device 1, and the LRM plug guide pin 201 of the module under test 2 is facing the direction of the sliding measurement mechanism.

[0042] The sliding measuring mechanism includes a height digital display vernier caliper 101, which is used to make the height digital display vernier caliper 101 slide along the second direction. The first direction and the second direction are both horizontal directions, and the second direction is perpendicular to the first direction, that is, the sliding direction is the left and right side direction of the entire measuring device 1.

[0043] A reference surface is also provided on one side of the base 104 close to the reference positioning mechanism. When the module under test 2 is inserted into the measuring device and locked, the LRM plug guide pin 201 of the module under test 2 and the reference surface are jointly covered by the measuring plane formed by the movement of the claw 107 of the height digital display vernier caliper 101 along the second direction and the vertical direction.

[0044] In this embodiment, Figure 4 and Figure 5 As shown, the reference positioning mechanism includes a left side plate 105 and a right side plate 106, both of which are connected to the base 104, and a left positioning groove and a right positioning groove are formed at the connection respectively, for correspondingly accommodating the left and right ribs 202 of the module under test; the bottom surfaces of the left positioning groove and the right positioning groove are at the same height, provided by the base 104, which can be seen in FIG. Figure 5The plane D marked is the bottom surface; the sides and top surfaces of the left positioning groove and the right positioning groove are provided by the corresponding left side plate 105 and right side plate 106, and reference can be made to Figure 5 for the markings. Plane F is the left top surface, and plane E is the right top surface; at the same time, the top surface of the positioning groove is also the surface that closely fits with the module locking bar ۲۰۳.

[0045] One of the features to ensure measurement accuracy is as follows: in this embodiment, when the measured module ۲ is inserted into the measuring device and locked, the lower surfaces of the left and right ribs ۲۰۲ of the measured module ۲ are in contact with the bottom surfaces of the corresponding left positioning groove and right positioning groove.

[0046] Please refer to Figure 4 、 Figure 6 and Figure 7 for the schematic. In this embodiment, the number of reference planes is two, and the two reference planes are respectively arranged corresponding to the positions of the left side plate 105 and the right side plate 106; the plane heights of the two reference planes are both higher than the bottom surface heights of the left positioning groove and the right positioning groove, and the plane heights of the two reference planes are different from each other. The vertical height between the reference plane and the bottom surface of the left positioning groove and the right positioning groove is equal to the radius of the corresponding LRM plug guide pin ۲۰۱.

[0047] Among them, the reference plane is divided into a right reference plane and a left reference plane. The right reference plane can be referred to Figure 6 , and is Figure 6 the plane AA marked in, corresponding to the position of the right side plate 106; the plane height of the right reference plane is 1.6 mm higher than the bottom surface heights of the left positioning groove and the right positioning groove, and the bottom surface is Figure 6 the plane D marked in; the right reference plane is used to provide zero calibration for the claw 107 of the height digital display vernier caliper 101 when measuring the LRM plug guide pin ۲۰۱ with a diameter of 3.2 mm.

[0048] The left reference plane can be referred to Figure 7 , and is Figure 7 the plane AB marked in, corresponding to the position of the left side plate 105; the plane height of the left reference plane is 1.75 mm higher than the bottom surface heights of the left positioning groove and the right positioning groove, and the bottom surface is Figure 7 the plane D marked in, and is in the same height plane as the plane D in Figure 6 ; the left reference plane is used to provide zero calibration for the claw 107 of the height digital display vernier caliper 101 when measuring the LRM plug guide pin ۲۰۱ with a diameter of 3.5 mm.

[0049] One of the features to ensure measurement accuracy is as follows: the lower surface of the claw 107 of the height digital display vernier caliper 101 is in a parallel plane relationship with the left reference plane and the right reference plane, so as to ensure the accuracy of zero calibration based on the reference plane.

[0050] The following is an introduction to the preferred structure of the sliding measurement mechanism, which can be seen in Figure 4 the schematic diagram. The sliding measurement mechanism further includes a wedge-shaped slider 102 and two wedge-shaped stoppers 103. The two wedge-shaped stoppers 103 are arranged on the base 104; the two wedge-shaped stoppers 103 are arranged in parallel, and a chute space for the wedge-shaped slider 102 to slide along the second direction is formed between the wedge-shaped stoppers 103; a high-precision digital display vernier caliper 101 is installed on the wedge-shaped slider 102.

[0051] Through the module size measuring device of this embodiment, operate the claw 107 of the wedge-shaped slider 102 and the high-precision digital display vernier caliper 101, and perform zero calibration with the help of the reference plane, then the measured module inserted into the test device 1 can be directly measured; since the reference plane is designed compared with the surface of the rib 202, and the vernier caliper can ensure moving vertically and contacting the upper vertex of the circumferences of the reference plane and the cylindrical surface of the LRM plug guide pin 201, the measured value displayed by the measurement is directly the vertical distance between the rib plane of the measured module 2 and the center line of the LRM connector guide pin. Compared with the size of the standard vertical distance of 14.4 ± 0.1 mm, it can be determined whether the measurement result meets the relevant requirements, thus avoiding the situation of installing modules with unqualified precision and bringing an improvement in the module assembly efficiency.

[0052] Embodiment 2

[0053] Based on Embodiment 1 and using its module size measuring device, this embodiment provides a method for measuring the size of an ASAAC module applied to an LRM connector, including the following steps:

[0054] S1. Insert the left and right ribs 202 of the measured module 2 into the measuring device along the left positioning groove and the right positioning groove;

[0055] S2. After inserting in place, expand and clamp the locking strip 203 of the measured module 2 in the positioning groove. At this time, ensure that the lower surfaces of the left and right ribs 202 of the measured module 2 are in contact with the bottom surfaces of the corresponding left positioning groove and right positioning groove;

[0056] S3. Select the corresponding reference plane on the measuring device according to the type of the LRM plug guide pin 201 on the measured module 2;

[0057] S4. Move the wedge-shaped slider 102 to the position corresponding to the reference plane, and operate the high-precision digital display vernier caliper 101 on the wedge-shaped slider 102 to make the lower surface of the claw 107 in contact with the reference plane for zero calibration;

[0058] S5. Move the wedge-shaped slider 102 to the position corresponding to the LRM plug guide pin 201 on the DUT module 2. Operate the height digital vernier caliper 101 on the wedge-shaped slider 102 to make the lower surface of the scribing claw 107 contact the upper vertex of the cylindrical surface circumference of the LRM plug guide pin 201, and read the measurement value at this time to obtain the measurement result.

[0059] In this embodiment, in step S3, the types of the LRM plug guide pins 201 on the DUT module 2 are divided according to the diameters of the LRM plug guide pins 201, and the diameters of the LRM plug guide pins 201 include 3.2 mm and 3.5 mm; in step S5, the number of the LRM plug guide pins 201 on the DUT module 2 is 2. Move the wedge-shaped slider 102 and the scribing claw 107, and respectively read the size measurement values corresponding to each LRM plug guide pin 201 to jointly form the measurement result.

[0060] When the DUT module 2 has an LRM plug guide pin 201 with a diameter of 3.2 mm, select the reference plane with a height of 1.6 mm on the measuring device; when the DUT module 2 has an LRM plug guide pin 201 with a diameter of 3.5 mm, select the reference plane with a height of 1.75 mm on the measuring device; wherein, the height of the reference plane is the vertical distance between the plane where the reference plane is located and the plane where the bottom surfaces of the left positioning groove and the right positioning groove are located.

[0061] Therefore, the entire measurement process can be specifically summarized as follows: Insert the DUT module 2 from front to back into the measuring device 1 until it stops moving, and tighten the left and right locking bars 203 on the DUT module 2; make the lower scribing surface of the scribing claw 107 of the height digital vernier caliper 101 contact the 1.6 mm reference plane or the 1.75 mm reference plane, that is, the AA plane or the AB plane, so as to zero-calibrate the height digital vernier caliper 101. Slide the scribing claw 107 upward and horizontally to contact the upper vertex of the cylindrical surface circumference of the right LRM plug guide pin 201 of the DUT module 2. The value displayed on the height digital vernier caliper 101 is the distance between the center of the right guide pin and the reference plane of the right rib of the module, that is, the measurement value on the right side; then slide the scribing claw 107 upward and horizontally again to make the scribing claw 107 contact the upper vertex of the cylindrical surface circumference of the left LRM plug guide pin 201 of the DUT module 2. The value displayed on the height digital vernier caliper 101 is the distance between the center of the left guide pin and the reference plane of the left rib of the module, that is, the measurement value on the left side; according to the measurement values on the left and right sides, the measurement result can be formed to determine whether the dimensional accuracy of this DUT module meets the requirements for on-machine assembly.

Claims

1. An ASAAC module size measuring device using an LRM connector, characterized in that: The invention comprises a base (104), wherein the base (104) is provided with a reference positioning mechanism and a sliding measuring mechanism on the front and rear sides respectively; a positioning groove is formed at the connection between the reference positioning mechanism and the base (104), and the positioning groove is used to accommodate the rib (202) of the module under test (2) and also to provide a space for the locking strip (203) of the module under test (2) to be stretched and clamped; the reference positioning mechanism is used to make the module under test (2) slide and be inserted in a first direction and be positioned and locked in the measuring device; the sliding measuring mechanism comprises a height digital display vernier caliper (101), The sliding measuring mechanism is used to make the height digital display vernier caliper (101) slide and move along a second direction, the first direction and the second direction are both horizontal directions, and the second direction is perpendicular to the first direction; a reference surface is also provided on a side of the base (104) close to the reference positioning mechanism, and when the measured module (2) is inserted into the measuring device and locked, the LRM plug guide pin (201) of the measured module (2) and the reference surface are jointly covered by the measuring plane formed by the movement of the claw (107) of the height digital display vernier caliper (101) along the second direction and the vertical direction.

2. The ASAAC module size measuring device using an LRM connector according to claim 1, characterized in that: The reference positioning mechanism includes a left side plate (105) and a right side plate (106), both of which are connected to the base (104), and a left positioning groove and a right positioning groove are formed at the connection respectively, for correspondingly accommodating the left and right ribs (202) of the module to be tested; the bottom surfaces of the left positioning groove and the right positioning groove are at the same height, provided by the base (104), and the side surfaces and top surfaces of the left positioning groove and the right positioning groove are provided by the corresponding left side plate (105) and the right side plate (106).

3. The ASAAC module size measuring device using an LRM connector according to claim 2, characterized in that: When the module under test (2) is inserted into the measuring device and locked, the lower surfaces of the left and right ribs (202) of the module under test (2) fit the bottom surfaces of the corresponding left and right positioning grooves.

4. The ASAAC module size measuring device using an LRM connector according to claim 2, wherein: There are two reference surfaces, and the two reference surfaces are respectively arranged corresponding to the positions of the left side plate (105) and the right side plate (106); the plane heights of the two reference surfaces are both higher than the bottom heights of the left positioning groove and the right positioning groove, and the plane heights of the two reference surfaces are different from each other; the vertical height between the reference surface and the bottom surface of the left positioning groove and the right positioning groove is equal to the radius of the corresponding LRM plug guide pin (201).

5. The ASAAC module size measuring device using an LRM connector according to claim 4, characterized in that: The reference surface includes a right reference surface, which is arranged corresponding to the position of the right side plate (106); the plane height of the right reference surface is 1.6 mm higher than the bottom height of the left positioning groove and the right positioning groove, and the right reference surface is used to provide zero calibration for the claw (107) of the height digital display vernier caliper (101) when measuring the LRM plug guide pin (201) with a diameter of 3.2 mm.

6. The ASAAC module size measuring device using an LRM connector according to claim 5, characterized in that: The reference surface also includes a left reference surface, which corresponds to the position setting of the left side plate (105); the plane height of the left reference surface is 1.75 mm higher than the bottom surface height of the left positioning groove and the right positioning groove. The left reference surface is used to provide zero calibration for the claw (107) of the height digital display vernier caliper (101) when measuring the LRM plug guide pin (201) with a diameter of 3.5 mm; the lower surface of the claw (107) is in a parallel plane relationship with the left reference surface and the right reference surface.

7. The ASAAC module size measuring device using an LRM connector according to claim 4, characterized in that: The sliding measuring mechanism further comprises a wedge-shaped slider (102) and two wedge-shaped stoppers (103), wherein the two wedge-shaped stoppers (103) are arranged on the base (104); the two wedge-shaped stoppers (103) are arranged in parallel, and a sliding groove space is formed between the wedge-shaped stoppers (103) for enabling the wedge-shaped slider (102) to slide along the second direction; and the height digital display vernier caliper (101) is mounted on the wedge-shaped slider (102).

8. A method for measuring the size of an ASAAC module using an LRM connector, characterized in that: Using the dimension measuring device according to claim 7, the method comprises the following steps: S1, inserting the left and right ribs (202) of the module to be measured (2) into the measuring device along the left and right positioning grooves; S2. After the module is inserted into place, the locking strip (203) of the module under test (2) is stretched and clamped in the positioning groove, and at this time, the lower surfaces of the left and right ribs (202) of the module under test (2) are ensured to fit the bottom surfaces of the corresponding left and right positioning grooves; S3, selecting a corresponding reference surface on the measuring device according to the type of the LRM plug guide pin (201) on the module under test (2); S4, moving the wedge-shaped slider (102) to a position corresponding to the reference surface, operating the height digital display vernier caliper (101) on the wedge-shaped slider (102), making the lower surface of the claw (107) fit the reference surface, and performing zero calibration; S5. Move the wedge-shaped slider (102) to the position corresponding to the LRM plug guide pin (201) on the module under test (2), operate the height digital display vernier caliper (101) on the wedge-shaped slider (102), make the lower surface of the claw (107) stick to the upper vertex of the cylindrical surface circumference of the LRM plug guide pin (201), read the measurement value at this time, and obtain the measurement result.

9. The method for measuring the size of an ASAAC module using an LRM connector according to claim 8, wherein: In said S3, the type of the LRM plug guide pin (201) on the module under test (2) is divided according to the diameter of the LRM plug guide pin (201), and the diameter of the LRM plug guide pin (201) includes 3.2 mm and 3.5 mm; in said S5, there are a plurality of LRM plug guide pins (201) on the module under test (2), and the wedge-shaped slider (102) and the claw (107) are moved to read the corresponding size measurement value of each LRM plug guide pin (201) respectively, and together form a measurement result.

10. The method for measuring the size of an ASAAC module using an LRM connector according to claim 9, wherein: When the module under test (2) has an LRM plug guide pin (201) with a diameter of 3.2 mm, a reference plane with a height of 1.6 mm on the measuring device is selected; when the module under test (2) has an LRM plug guide pin (201) with a diameter of 3.5 mm, a reference plane with a height of 1.75 mm on the measuring device is selected; wherein the height of the reference plane is the vertical distance between the plane where the reference plane is located and the plane where the bottom surfaces of the left positioning groove and the right positioning groove are located.

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