Device and method for ultrasonic testing of the fit of a connecting rod bushing

Abstract

The application provides a device and method for detecting the adhesion of a connecting rod bushing by ultrasonic waves, and belongs to the technical field of connecting rod bushing adhesion detection.The big-hole clamp comprises a plurality of positioning blocks, and the positioning blocks are copointed in the transverse section; the ultrasonic probe can move up and down and left and right, and can rotate; the center of the ultrasonic probe, the center of the big-hole clamp and the center of the connecting rod body clamp are located on a straight line; when the device for detecting the adhesion of a connecting rod bushing by ultrasonic waves is working, the connecting rod is positioned first, and then the connecting rod bushing adhesion detection is started; the plurality of positioning blocks can move and touch the inner wall of the big hole, the connecting rod body clamp can move and clamp the connecting rod, and the ultrasonic probe can move to contact the connecting rod bushing.The application can adapt to the positioning and clamping of connecting rods of different sizes, does not need to damage the connecting rod, reduces the economic loss, improves the yield, and improves the detection accuracy and detection efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of connecting rod bushing fit detection, and particularly relates to a device and method for detecting the fit of a connecting rod bushing by ultrasonic waves. BACKGROUND

[0002] Connecting rods are key components of engines, and bear high periodic loads in operation. The stress on connecting rods is very complex, and the quality of connecting rods directly affects the performance and service life of engines. Therefore, the quality requirements for connecting rods are becoming higher and higher. The fit between the bushing and the connecting rod hole has an important influence on the performance of the connecting rod, especially when there is a gap between the fit of the connecting rod bushing and the hole, which will seriously affect the use of the connecting rod.

[0003] The bushing and the corresponding seat hole are usually assembled by interference fit, and are connected together by the pressure generated by the interference fit. The fit between the bushing and the connecting rod is affected by multiple factors such as interference amount, manufacturing precision and assembly precision, and it is difficult to form a complete assembly surface of mutual contact and fit. If the fit rate of the assembly surface is low, the pressure generated by the interference fit is also relatively small, and mutual rotation or falling off will occur, and in serious cases, safety accidents will occur.

[0004] The traditional method for detecting the fit of a connecting rod bushing is mainly a destructive sampling inspection method. For example, a bushing with red powder on the outer wall is pressed into the small end hole of the connecting rod according to the normal assembly method, and then pressed out. The red powder on the fit will peel off, and then the trace on the outer circular surface of the bushing is transferred by transparent tape and pasted on the prepared grid paper, so that the fit area can be determined.

[0005] The traditional method for detecting the fit of a connecting rod bushing has many disadvantages:

[0006] (1) The workpiece is damaged, and resources are wasted;

[0007] (2) Only sampling detection can be performed, and the reliability is low;

[0008] (3) Manual operation, low detection efficiency, etc. SUMMARY

[0009] To solve the technical problems in the prior art, the application provides a device and a method for detecting the fit degree of a connecting rod bushing by using ultrasonic waves, wherein when the device is used, the connecting rod is placed on the device for detecting the fit degree of the connecting rod bushing by using ultrasonic waves, and the device comprises a moving platform, a rack, a clamp assembly and a detection assembly; the rack comprises a top portion, a bottom portion and a side wall; the side wall is open on the opposite side, the top portion and the bottom portion are opposite to each other and both are perpendicular to the side wall; the moving platform is installed on the top portion of the rack; the clamp assembly comprises a large-hole clamp, a connecting rod body clamp and a clamp base; the detection assembly comprises an ultrasonic probe and a computer; the large-hole clamp comprises a plurality of positioning blocks, and the positioning blocks are copointed in the transverse cross section; when the connecting rod is placed on the device for detecting the fit degree of the connecting rod bushing by using ultrasonic waves, the copoint is located at the center of the large hole; the clamp base is arranged on the upper surface of the bottom portion of the rack, the ultrasonic probe is arranged at one end of the upper surface of the clamp base, the ultrasonic probe can move up and down and left and right and can rotate; the large-hole clamp and the connecting rod body clamp are arranged at the other end of the upper surface of the clamp base; the center of the ultrasonic probe, the center of the large-hole clamp and the center of the connecting rod body clamp are located on a straight line; the ultrasonic probe is connected with the computer; the plurality of positioning blocks can move and touch the inner wall of the large hole, stop moving after touching, the connecting rod body clamp can move and clamp the connecting rod, and the ultrasonic probe can move to contact the connecting rod bushing. The device can adapt to the positioning and clamping of connecting rods of different sizes, does not need to damage the integrity of the connecting rod, reduces economic loss and improves the yield rate; the device avoids the error of manual judgment, improves the detection accuracy and the detection efficiency.

[0010] The application provides a device for detecting the fit degree of a connecting rod bushing by using ultrasonic waves, wherein when the device is used, the connecting rod is placed on the device for detecting the fit degree of the connecting rod bushing by using ultrasonic waves, and the device comprises a moving platform, a rack, a clamp assembly and a detection assembly;

[0011] The rack comprises a top portion, a bottom portion and a side wall; the side wall is open on the opposite side, the top portion and the bottom portion are opposite to each other and both are perpendicular to the side wall;

[0012] The moving platform is installed on the top portion of the rack;

[0013] The clamp assembly comprises a large-hole clamp, a connecting rod body clamp and a clamp base;

[0014] The detection assembly comprises an ultrasonic probe and a computer;

[0015] The large-hole clamp comprises a plurality of positioning blocks, and the positioning blocks are copointed in the transverse cross section; when the connecting rod is placed on the device for detecting the fit degree of the connecting rod bushing by using ultrasonic waves, the copoint is located at the center of the large hole;

[0016] The clamp base is arranged on the upper surface of the bottom portion of the rack, the ultrasonic probe is arranged at the lower end of the moving platform, the ultrasonic probe can move up and down and left and right and can rotate;

[0017] The big head hole clamp and the connecting rod body clamp are arranged on the upper surface of the clamp base;

[0018] The ultrasonic probe is connected with the ultrasonic flaw detection card, the ultrasonic flaw detection card is connected with the computer, the ultrasonic flaw detection card can excite the ultrasonic probe to emit ultrasonic waves, the ultrasonic flaw detection card collects echo data and transmits the echo data back to the computer for analysis.

[0019] The plurality of positioning blocks can move and touch the inner wall of the big head hole, stop moving after touching, the connecting rod body clamp can move and clamp the connecting rod, and the ultrasonic probe can move to be close to the connecting rod bushing.

[0020] Preferably, each positioning block is provided with a positioning block sliding rail, and the positioning block can move along the corresponding sliding rail.

[0021] Preferably, when the ultrasonic detection connecting rod bushing fit degree device is working, the plurality of positioning blocks move away from the common point at a constant speed.

[0022] Preferably, in the transverse section, the included angle between the adjacent two positioning blocks is less than or equal to 120 degrees.

[0023] Preferably, the positioning blocks are 3, and the included angle between the adjacent positioning blocks in the transverse section is 120 degrees.

[0024] Preferably, the connecting rod body clamp comprises two oppositely arranged clamping blocks.

[0025] Preferably, the longitudinal section of the clamping block is arc-shaped.

[0026] Preferably, the clamping block is an elastic body or an elastic body is arranged in the arc-shaped inner wall of the clamping block.

[0027] The application provides an ultrasonic detection connecting rod bushing fit degree method, using any one of the above ultrasonic detection connecting rod bushing fit degree devices, comprising the following steps:

[0028] A standard sample is made, and a standard ultrasonic echo signal of the connecting rod bushing fit in the standard sample is measured;

[0029] The plurality of positioning blocks move at a constant speed to the inner wall of the big head hole, and stop moving after touching the inside of the big head hole;

[0030] The connecting rod body clamp moves and clamps the connecting rod to be detected;

[0031] The ultrasonic probe moves to contact the bushing;

[0032] The ultrasonic flaw detection card excites the ultrasonic probe to emit ultrasonic waves, and the ultrasonic flaw detection card acquires the ultrasonic echo signal of a detection point of the connecting rod to be detected;

[0033] The acquired ultrasonic echo signal of the detection point of the connecting rod to be detected is compared with the standard ultrasonic echo signal, if the difference between the two exceeds a preset threshold, it is judged that the detection point is not fitted, otherwise, the detection point is fitted;

[0034] The plurality of detection points are detected one by one and whether each detection point is fitted is judged;

[0035] The ratio of the total amount of fitted detection points to the total number of detection points is calculated to obtain the fitting degree of the connecting rod bushing.

[0036] Preferably, the standard sample is made of the material of the connecting rod and the material of the bushing, and a cuboid conforming to the preset length-width range and the preset thickness range is made.

[0037] Preferably, the state of the bushing fitting in the small head hole of the connecting rod is simulated by applying pressure to one side of the bushing material of the standard sample.

[0038] Preferably, the pressure P is calculated by the following formula:

[0039]

[0040] Wherein:

[0041] Delta is the amount of interference, specifically the difference between the outer diameter of the bushing and the inner diameter of the small head hole of the connecting rod;

[0042] E1 and E2 are the elastic modulus of the bushing and the connecting rod material, respectively;

[0043] Mu1 and Mu2 are the Poisson's ratio of the bushing and the connecting rod material, respectively;

[0044] D1 and D2 are the inner diameter of the bushing and the outer diameter of the small head hole, respectively;

[0045] D is the nominal size of the outer diameter of the bushing or the inner diameter of the small head hole of the connecting rod;

[0046] P is the surface pressure of the bushing or the small head hole of the connecting rod.

[0047] Compared with the prior art, the beneficial effects of the present application are as follows:

[0048] 1. The big hole clamp of the present application includes a plurality of positioning blocks, the plurality of positioning blocks are copointed in the transverse section, move at the same speed along the slide rail and touch the inner wall of the big hole to stop moving, which can satisfy the positioning of connecting rods of different models;

[0049] 2. The connecting rod body clamp of the present application comprises two oppositely arranged clamping blocks, the clamping blocks are moved along the slide rail, and the clamping blocks are elastic bodies or elastic bodies are arranged in the arc-shaped inner walls of the clamping blocks, so that the clamping of connecting rods of different models can be met.

[0050] 3. The ultrasonic detection connecting rod bushing fit degree detection method of the present application does not need to damage the integrity of the connecting rod, reduces economic loss, improves the yield, avoids the error of manual judgment, and improves the detection quality and detection efficiency.

[0051] 4. The present application provides a standard method for obtaining an ultrasonic echo signal of a connecting rod bushing fit, so that the fit degree detection is more accurate. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 The perspective view of the front view of the ultrasonic detection connecting rod bushing fit degree device of an embodiment of the present application during detection, in which the ultrasonic probe has been moved into the bushing;

[0053] Figure 2 The top view of the ultrasonic detection connecting rod bushing fit degree device of an embodiment of the present application from the moving platform; in the figure, the connecting rod to be detected is placed;

[0054] Figure 3 The front view of the standard sample and the method for measuring the standard ultrasonic echo signal of the connecting rod bushing fit in the standard sample of an embodiment of the present application;

[0055] Figure 4 The cooperation schematic diagram of the bushing and the small head hole of an embodiment of the present application;

[0056] Figure 5 The flowchart of the method for ultrasonic detection of the connecting rod bushing fit degree of an embodiment of the present application;

[0057] In the figure, 1 is a computer; 2 is a moving platform; 3 is an ultrasonic probe; 4 is a clamp base; 5 is a connecting rod; 6 is a rack; 7 is a large head hole clamp; 8 is a connecting rod body clamp; 9 is a bushing; 10 is an ultrasonic flaw detection card; 11 is a connecting rod small head hole; 701 is a positioning block; and 801 is a clamping block. DETAILED DESCRIPTION

[0058] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0059] The present application provides an ultrasonic detection connecting rod bushing 9 fit degree device, when used, the connecting rod 5 is placed on the ultrasonic detection connecting rod bushing 9 fit degree device, which comprises a moving platform 2, a rack 6, a clamp assembly and a detection assembly;

[0060] The rack 6 comprises a top, a bottom and a side wall; the side wall is open on the opposite side, the top and the bottom are opposite and perpendicular to the side wall;

[0061] The moving platform 2 is installed on the top of the rack 6;

[0062] The clamp assembly comprises a big hole clamp 7, a connecting rod clamp 8 and a clamp base 4;

[0063] The detection assembly comprises an ultrasonic probe 3 and a computer 1;

[0064] The big hole clamp 7 comprises a plurality of positioning blocks 701, which are copointed in the transverse section, and when the connecting rod 5 is placed on the device for detecting the adhesion of the connecting rod bushing 9, the copoint is located at the center of the big hole;

[0065] The clamp base is arranged on the upper surface of the bottom of the rack 6, the ultrasonic probe 3 is arranged at the lower end of the moving platform 2, and the ultrasonic probe 3 can move up and down and left and right and can rotate;

[0066] The big hole clamp 7 and the connecting rod clamp 8 are arranged on the upper surface of the clamp base 4;

[0067] The ultrasonic probe 3 is connected with the ultrasonic flaw detection card 10, the ultrasonic flaw detection card 10 is connected with the computer 1, the ultrasonic flaw detection card 10 can excite the ultrasonic probe 3 to emit ultrasonic waves, the ultrasonic flaw detection card 10 collects echo data and transmits the echo data back to the computer 1 for analysis;

[0068] The plurality of positioning blocks 701 can move and touch the inner wall of the big hole and stop moving after touching, the connecting rod clamp 8 can move and clamp the connecting rod 5, and the ultrasonic probe 3 can move to be close to the connecting rod bushing 9.

[0069] According to a specific embodiment of the present application, each positioning block 701 is provided with a positioning block sliding rail, and the positioning block 701 can move along the corresponding sliding rail.

[0070] According to a specific embodiment of the present application, when the device for detecting the adhesion of the connecting rod bushing 9 works, the plurality of positioning blocks 701 move at a constant speed from the copoint to the direction away from the copoint.

[0071] According to a specific embodiment of the present application, in the transverse section, the included angle between two adjacent positioning blocks 701 is less than or equal to 120 degrees.

[0072] According to a specific embodiment of the present application, the positioning blocks 701 are three, and the included angle between two adjacent positioning blocks 701 in the transverse section is 120 degrees.

[0073] According to one specific embodiment of the present application, the connecting rod body clamp 8 comprises two oppositely arranged clamping blocks 801.

[0074] According to one specific embodiment of the present application, the longitudinal section of the clamping block 801 is arc-shaped.

[0075] According to one specific embodiment of the present application, the clamping block 801 is elastic or an elastic body is arranged in the arc-shaped inner wall of the clamping block 801, which can clamp connecting rods 5 of different models.

[0076] The present application provides a method for detecting the fit degree of a connecting rod bushing 9 by using any of the above-mentioned devices for detecting the fit degree of a connecting rod bushing 9, which comprises the following steps:

[0077] A standard sample is made and the standard ultrasonic echo signal of the fit of the connecting rod bushing 9 in the standard sample is measured;

[0078] The plurality of positioning blocks 701 move at a constant speed towards the inner wall of the large hole and stop moving after touching the inner part of the large hole;

[0079] The connecting rod body clamp 8 moves and clamps the connecting rod 5 to be detected;

[0080] The ultrasonic probe 3 moves to contact the bushing 9 in the small hole 11 of the connecting rod;

[0081] The ultrasonic flaw detector card 10 excites the ultrasonic probe 3 to emit ultrasonic waves, and the ultrasonic flaw detector card 10 acquires the ultrasonic echo signal of a detection point of the connecting rod 5 to be detected;

[0082] The acquired ultrasonic echo signal of the detection point of the connecting rod 5 to be detected is compared with the standard ultrasonic echo signal, and if the difference between the two exceeds a preset threshold, it is determined that the detection point is not fit, otherwise, the detection point is fit;

[0083] The plurality of detection points are detected one by one and it is determined whether each detection point is fit;

[0084] The ratio of the total number of fit detection points to the total number of detection points is calculated to obtain the fit degree of the connecting rod bushing 9.

[0085] According to one specific embodiment of the present application, the standard sample is made of the material of the connecting rod 5 and the material of the bushing 9, respectively, and a cuboid conforming to a preset length-width range and a preset thickness range is made.

[0086] According to one specific embodiment of the present application, the state of the bushing fitting the small hole of the connecting rod 5 is simulated by applying pressure to one side of the bushing 9 material in the standard sample.

[0087] According to one specific embodiment of the present application, the pressure P is calculated by the following formula:

[0088]

[0089] Wherein:

[0090] Δ is the interference amount, specifically the difference between the outer diameter of the bushing and the inner diameter of the small end hole of the connecting rod;

[0091] E1, E2 are the elastic modulus of the bushing and the connecting rod material, respectively;

[0092] μ1, μ2 are the Poisson's ratios of the bushing and the connecting rod material, respectively;

[0093] d1, d2 are the inner diameter of the bushing and the outer diameter of the small end hole, respectively;

[0094] d is the nominal size of the outer diameter of the bushing or the inner diameter of the small end hole of the connecting rod;

[0095] P is the surface pressure of the bushing or the small end hole of the connecting rod.

[0096] According to a specific embodiment of the present application, the process of ultrasonic detection of the fit of the connecting rod bushing is as follows:

[0097] According to the size and material of the connecting rod to be detected, a sample as shown in FIG. 1 is made; Figure 3

[0098] The pressure P is calculated by the following formula, and a force of the same size as the pressure P is applied on the surface of the sample to simulate the state of the fit of the bushing;

[0099]

[0100] The ultrasonic probe of the device for ultrasonic detection of the fit of the connecting rod bushing is detected on the surface of the sample to simulate the bushing, and the echo signal is recorded as a standard signal;

[0101] The actual connecting rod to be detected is placed on the clamp, and the computer 1 sends instructions to start positioning:

[0102] First, the three separate positioning blocks of the large hole clamp move outward at equal speeds on their respective tracks, and stop after touching the inner wall of the large hole, thereby limiting the translational movement of the connecting rod;

[0103] Then the connecting rod body clamp 8 moves relatively on the track to clamp the connecting rod, thereby limiting the rotation of the connecting rod, and completing the positioning of the connecting rod. According to the size of different models of connecting rods, the moving distance of the large hole clamp and the connecting rod body clamp can be adjusted to realize the positioning of different models of connecting rods.

[0104] After positioning is completed, the fit detection process begins, and the ultrasonic probe 3 is fixed on the moving platform 2, which can realize up, down, left, right and rotation movements.

[0105] ​When detecting, the ultrasonic probe 3 is moved to contact with the bushing, the computer 1 sends a command to control the ultrasonic flaw detector card to generate an excitation signal to make the ultrasonic probe emit ultrasonic waves, at this time, the ultrasonic echo signal is transmitted to the computer 1 through the ultrasonic flaw detector card, the computer 1 collects and displays, and judges the fitting condition of the point at the same time, after the judgment is completed, the fitting conditions of other points are continuously detected. The ratio of the number of fitting points to the number of detection points is the overall fitting degree, and the more the number of detection points is, the more accurate it is.

[0106] Embodiment 1

[0107] According to one specific embodiment of the present application, the ultrasonic detection connecting rod bushing fitting degree device of the present application is described in detail below.

[0108] The present application provides an ultrasonic detection connecting rod bushing 9 fitting degree device, when in use, the connecting rod 5 is placed on the ultrasonic detection connecting rod bushing 9 fitting degree device, which comprises a moving platform 2, a rack 6, a clamp assembly and a detection assembly;

[0109] The rack 6 comprises a top, a bottom and a side wall; the opposite sides of the side wall are open, the top and the bottom are opposite to each other and both are perpendicular to the side wall;

[0110] The moving platform 2 is installed on the top of the rack 6;

[0111] The clamp assembly comprises a big hole clamp 7, a connecting rod body clamp 8 and a clamp base 4;

[0112] The detection assembly comprises an ultrasonic probe 3 and a computer 1;

[0113] The big hole clamp 7 comprises a plurality of positioning blocks 701, the plurality of positioning blocks 701 are copointed in the transverse section, when the connecting rod 5 is placed on the ultrasonic detection connecting rod bushing 9 fitting degree device, the copoint is located at the center of the big hole;

[0114] The clamp base is arranged on the upper surface of the bottom of the rack 6, the ultrasonic probe 3 is arranged at the lower end of the moving platform 2, the ultrasonic probe 3 can move up and down and left and right, and can rotate;

[0115] The big hole clamp 7 and the connecting rod body clamp 8 are arranged on the upper surface of the clamp base 4;

[0116] The ultrasonic probe 3 is connected with the ultrasonic flaw detector card 10, the ultrasonic flaw detector card 10 is connected with the computer 1, the ultrasonic flaw detector card 10 can excite the ultrasonic probe 3 to emit ultrasonic waves, the ultrasonic flaw detector card 10 collects echo data and transmits the echo data back to the computer 1 for analysis;

[0117] The plurality of positioning blocks 701 can move and touch the inner wall of the large hole, stop moving after touching, the connecting rod body clamp 8 can move and clamp the connecting rod 5, and the ultrasonic probe 3 can move to be close to the connecting rod bushing 9.

[0118] Embodiment 2

[0119] According to one specific embodiment of the present application, the ultrasonic detection device for connecting rod bushing fit degree is described in detail below.

[0120] The present application provides an ultrasonic detection device for connecting rod bushing fit degree, when used, the connecting rod 5 is placed on the ultrasonic detection device for connecting rod bushing fit degree, which comprises a moving platform 2, a rack 6, a clamp assembly and a detection assembly;

[0121] The rack 6 comprises a top, a bottom and a side wall; the side wall is open on the opposite side, the top and the bottom are opposite and perpendicular to the side wall;

[0122] The moving platform 2 is installed on the top of the rack 6;

[0123] The clamp assembly comprises a large hole clamp 7, a connecting rod body clamp 8 and a clamp base 4;

[0124] The detection assembly comprises an ultrasonic probe 3 and a computer 1;

[0125] The large hole clamp 7 comprises a plurality of positioning blocks 701, which are copointed in the transverse section, and when the connecting rod 5 is placed on the ultrasonic detection device for connecting rod bushing fit degree, the copoint is located at the center of the large hole;

[0126] The clamp base is arranged on the upper surface of the bottom of the rack 6, the ultrasonic probe 3 is arranged at the lower end of the moving platform 2, the ultrasonic probe 3 can move up and down and left and right, and can rotate;

[0127] The large hole clamp 7 and the connecting rod body clamp 8 are arranged on the upper surface of the clamp base 4;

[0128] The ultrasonic probe 3 is connected with the ultrasonic flaw detection card 10, the ultrasonic flaw detection card 10 is connected with the computer 1, the ultrasonic flaw detection card 10 can excite the ultrasonic probe 3 to emit ultrasonic waves, the ultrasonic flaw detection card 10 collects echo data and transmits the echo data back to the computer 1 for analysis;

[0129] The plurality of positioning blocks 701 can move and touch the inner wall of the large hole, stop moving after touching, the connecting rod body clamp 8 can move and clamp the connecting rod 5, and the ultrasonic probe 3 can move to be close to the connecting rod bushing 9.

[0130] Each positioning block 701 is provided with a positioning block sliding rail, and the positioning block 701 can move along the corresponding sliding rail.

[0131] When the device for detecting the fit degree of the connecting rod bushing 9 is in operation, the plurality of positioning blocks 701 move away from the common point at a constant speed.

[0132] In the transverse section, the included angle between two adjacent positioning blocks 701 is less than or equal to 120 degrees.

[0133] Embodiment 3

[0134] According to a specific embodiment of the present application, the device for detecting the fit degree of the connecting rod bushing 9 is described in detail below.

[0135] The present application provides a device for detecting the fit degree of the connecting rod bushing 9, which, when in use, places the connecting rod 5 on the device for detecting the fit degree of the connecting rod bushing 9, and comprises a moving platform 2, a rack 6, a clamp assembly and a detection assembly.

[0136] The rack 6 comprises a top, a bottom and a side wall; the side wall is open on the opposite side, the top and the bottom are opposite to each other and both are perpendicular to the side wall.

[0137] The moving platform 2 is installed on the top of the rack 6.

[0138] The clamp assembly comprises a big hole clamp 7, a connecting rod body clamp 8 and a clamp base 4.

[0139] The detection assembly comprises an ultrasonic probe 3 and a computer 1.

[0140] The big hole clamp 7 comprises a plurality of positioning blocks 701, and the plurality of positioning blocks 701 are common at a point in the transverse section; when the connecting rod 5 is placed on the device for detecting the fit degree of the connecting rod bushing 9, the common point is located at the center of the big hole.

[0141] The clamp base is arranged on the upper surface of the bottom of the rack 6, the ultrasonic probe 3 is arranged at the lower end of the moving platform 2, the ultrasonic probe 3 can move up and down and left and right, and can rotate.

[0142] The big hole clamp 7 and the connecting rod body clamp 8 are arranged on the upper surface of the clamp base 4.

[0143] The ultrasonic probe 3 is connected with the ultrasonic flaw detection card 10, the ultrasonic flaw detection card 10 is connected with the computer 1, the ultrasonic flaw detection card 10 can excite the ultrasonic probe 3 to emit ultrasonic waves, the ultrasonic flaw detection card 10 collects echo data and transmits the echo data back to the computer 1 for analysis.

[0144] The plurality of positioning blocks 701 can move and touch the inner wall of the large hole, stop moving after touching, the connecting rod body clamp 8 can move and clamp the connecting rod 5, and the ultrasonic probe 3 can move to be close to the connecting rod bushing 9.

[0145] The connecting rod body clamp 8 comprises two oppositely arranged clamping blocks 801.

[0146] The longitudinal section of the clamping block 801 is arc-shaped.

[0147] Embodiment 4

[0148] According to one specific embodiment of the present application, the ultrasonic detection device for the connecting rod bushing fit degree is described in detail below.

[0149] The present application provides an ultrasonic detection device for the connecting rod bushing 9 fit degree, when used, the connecting rod 5 is placed on the ultrasonic detection device for the connecting rod bushing 9 fit degree, which comprises a moving platform 2, a rack 6, a clamp assembly and a detection assembly;

[0150] The rack 6 comprises a top, a bottom and a side wall; the side wall is open on the opposite side, the top and the bottom are opposite and perpendicular to the side wall;

[0151] The moving platform 2 is installed on the top of the rack 6;

[0152] The clamp assembly comprises a large hole clamp 7, a connecting rod body clamp 8 and a clamp base 4;

[0153] The detection assembly comprises an ultrasonic probe 3 and a computer 1;

[0154] The large hole clamp 7 comprises a plurality of positioning blocks 701, and the plurality of positioning blocks 701 are copointed in the transverse section; when the connecting rod 5 is placed on the ultrasonic detection device for the connecting rod bushing 9 fit degree, the copoint is located at the center of the large hole;

[0155] The clamp base is arranged on the upper surface of the bottom of the rack 6, the ultrasonic probe 3 is arranged at the lower end of the moving platform 2, the ultrasonic probe 3 can move up and down and left and right, and can rotate;

[0156] The large hole clamp 7 and the connecting rod body clamp 8 are arranged on the upper surface of the clamp base 4;

[0157] The ultrasonic probe 3 is connected with the ultrasonic flaw detection card 10, the ultrasonic flaw detection card 10 is connected with the computer 1, the ultrasonic flaw detection card 10 can excite the ultrasonic probe 3 to emit ultrasonic waves, the ultrasonic flaw detection card 10 collects echo data and transmits the echo data back to the computer 1 for analysis;

[0158] The plurality of positioning blocks 701 can move and touch the inner wall of the large head hole, stop moving after touching, the connecting rod body clamp 8 can move and clamp the connecting rod 5, and the ultrasonic probe 3 can move to be close to the connecting rod bushing 9.

[0159] Each positioning block 701 is provided with a positioning block sliding rail, and the positioning block 701 can move along the corresponding sliding rail.

[0160] When the device for detecting the adhesion of the connecting rod bushing 9 works, the plurality of positioning blocks 701 move away from the common point at a constant speed.

[0161] In the transverse section, the included angle between the two adjacent positioning blocks 701 is less than or equal to 120 degrees.

[0162] The connecting rod body clamp 8 comprises two oppositely arranged clamping blocks 801.

[0163] The longitudinal section of the clamping block 801 is arc-shaped.

[0164] The plurality of positioning blocks 701 are three, and the included angle between the adjacent positioning blocks 701 in the transverse section is 120 degrees.

[0165] The clamping block 801 is an elastic body or an elastic body is arranged in the arc-shaped inner wall of the clamping block 801, so that the connecting rod 5 of different models can be clamped.

[0166] Embodiment 5

[0167] According to one specific embodiment of the present application, the method for detecting the adhesion of the connecting rod bushing 9 by ultrasonic waves will be described in detail.

[0168] The present application provides a method for detecting the adhesion of the connecting rod bushing 9 by ultrasonic waves, using any of the above devices for detecting the adhesion of the connecting rod bushing 9 by ultrasonic waves, comprising the following steps:

[0169] A standard sample is made, and the standard ultrasonic echo signal of the adhesion of the connecting rod bushing 9 in the standard sample is measured;

[0170] The plurality of positioning blocks 701 move at a constant speed to the inner wall of the large head hole, and stop moving after touching the inner wall of the large head hole;

[0171] The connecting rod body clamp 8 moves and clamps the connecting rod 5 to be detected;

[0172] The ultrasonic probe 3 moves to contact the bushing 9;

[0173] The ultrasonic flaw detection card 10 excites the ultrasonic probe 3 to emit ultrasonic waves, and the ultrasonic flaw detection card 10 acquires the ultrasonic echo signal of a detection point of the connecting rod 5 to be detected;

[0174] The acquired ultrasonic echo signal of a detection point of the connecting rod 5 to be detected is compared with the standard ultrasonic echo signal, if the difference between the two exceeds the preset threshold, it is judged that the detection point is not fitted, otherwise, the detection point is fitted;

[0175] The multiple detection points are detected one by one and whether each detection point is fitted is judged;

[0176] The ratio of the total amount of fitted detection points to the total number of detection points is calculated to obtain the fitting degree of the connecting rod bushing 9.

[0177] Embodiment 6

[0178] The application provides a method for detecting the fitting degree of a connecting rod bushing 9 by ultrasonic waves, using any of the above ultrasonic devices for detecting the fitting degree of a connecting rod bushing 9, comprising the following steps:

[0179] A standard sample is made and the standard ultrasonic echo signal of the fitting connecting rod bushing 9 in the standard sample is measured;

[0180] The multiple positioning blocks 701 move at a constant speed to the inner wall of the large hole, and stop moving after touching the inside of the large hole;

[0181] The connecting rod body clamp 8 moves and clamps the connecting rod 5 to be detected;

[0182] The ultrasonic probe 3 moves to contact the bushing 9;

[0183] The ultrasonic flaw detection card 10 excites the ultrasonic probe 3 to emit ultrasonic waves, and the ultrasonic flaw detection card 10 acquires the ultrasonic echo signal of a detection point of the connecting rod 5 to be detected;

[0184] The acquired ultrasonic echo signal of a detection point of the connecting rod 5 to be detected is compared with the standard ultrasonic echo signal, if the difference between the two exceeds the preset threshold, it is judged that the detection point is not fitted, otherwise, the detection point is fitted;

[0185] The multiple detection points are detected one by one and whether each detection point is fitted is judged;

[0186] The ratio of the total amount of fitted detection points to the total number of detection points is calculated to obtain the fitting degree of the connecting rod bushing 9.

[0187] Embodiment 7

[0188] The application provides a method for detecting the fitting degree of a connecting rod bushing 9 by ultrasonic waves, using any of the above ultrasonic devices for detecting the fitting degree of a connecting rod bushing 9, comprising the following steps:

[0189] A standard sample is made and the standard ultrasonic echo signal of the fitting connecting rod bushing 9 in the standard sample is measured;

[0190] The plurality of positioning blocks 701 move at a constant speed to the inner wall of the large head hole, and stop moving after touching the inner part of the large head hole;

[0191] The connecting rod body clamp 8 moves and clamps the connecting rod 5 to be detected;

[0192] The ultrasonic probe 3 moves to contact the bushing 9;

[0193] The ultrasonic flaw detection card 10 excites the ultrasonic probe 3 to emit ultrasonic waves, and the ultrasonic flaw detection card 10 obtains the ultrasonic echo signal of a detection point of the connecting rod 5 to be detected;

[0194] The obtained ultrasonic echo signal of the detection point of the connecting rod 5 to be detected is compared with the standard ultrasonic echo signal. If the difference between the two exceeds the preset threshold value, it is judged that the detection point is not fitted, otherwise, the detection point is fitted;

[0195] Each detection point is detected and whether each detection point is fitted is judged;

[0196] The ratio of the total number of fitted detection points to the total number of detection points is calculated to obtain the fitting degree of the connecting rod bushing 9.

[0197] The standard sample is made of the material of the connecting rod 5 and the material of the bushing 9, respectively, and a cuboid conforming to the preset length-width range and the preset thickness range is made.

[0198] The pressure is applied to one side of the bushing 9 material in the standard sample to simulate the state of the bushing fitting the small head hole of the connecting rod 5.

[0199] The pressure P is calculated by the following formula:

[0200]

[0201] Wherein:

[0202] Δ is the excess amount, specifically the difference between the outer diameter of the bushing and the inner diameter of the small head hole of the connecting rod;

[0203] E1 and E2 are the elastic moduli of the bushing and the connecting rod material, respectively;

[0204] μ1 and μ2 are the Poisson's ratios of the bushing and the connecting rod material, respectively;

[0205] d1 and d2 are the inner diameter of the bushing and the outer diameter of the small head hole, respectively;

[0206] d is the nominal size of the outer diameter of the bushing or the inner diameter of the small head hole of the connecting rod;

[0207] P is the surface pressure of the bushing or the small head hole of the connecting rod.

[0208] The above merely provides the preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. An apparatus for ultrasonically inspecting the fit of a connecting rod bushing, in use, a connecting rod is placed on the apparatus for ultrasonically inspecting the fit of a connecting rod bushing, characterized by, The device comprises a moving platform, a rack, a clamp assembly and a detection assembly. The rack comprises a top, a bottom and a side wall, the side wall is open on opposite sides, the top and the bottom are opposite and perpendicular to the side wall. The moving platform is installed on the top of the rack. The clamp assembly comprises a big-hole clamp, a connecting rod clamp and a clamp base. The detection assembly comprises an ultrasonic flaw detection card, an ultrasonic probe and a computer. The big-hole clamp comprises a plurality of positioning blocks, the positioning blocks are co-centered in the lateral cross-section, and when the connecting rod is placed on the device for ultrasonic detection of the connecting rod bushing adhesion, the co-center is located at the center of the big-hole. The clamp base is arranged on the upper surface of the bottom of the rack, the ultrasonic probe is arranged at the lower end of the moving platform, the ultrasonic probe can move up and down and left and right, and can rotate. The big-hole clamp and the connecting rod clamp are arranged on the upper surface of the clamp base. The ultrasonic probe is connected with the ultrasonic flaw detection card, the ultrasonic flaw detection card is connected with the computer, the ultrasonic flaw detection card can excite the ultrasonic probe to emit ultrasonic waves, the ultrasonic flaw detection card collects echo data and transmits the echo data back to the computer for analysis. The plurality of positioning blocks can move and touch the inner wall of the big-hole, stop moving after touching, the connecting rod clamp can move and clamp the connecting rod, and the ultrasonic probe can move to be close to the connecting rod bushing. Each positioning block is provided with a positioning block sliding rail, the positioning block can move along the corresponding sliding rail, and when the device for ultrasonic detection of the connecting rod bushing adhesion works, the plurality of positioning blocks move at a constant speed from the co-center to the direction away from the co-center. The connecting rod clamp comprises two oppositely arranged clamping blocks, the longitudinal cross-section of the clamping block is arc-shaped, and the clamping block is an elastic body or an elastic body is arranged on the arc-shaped inner wall of the clamping block.

2. The apparatus of claim 1, wherein, In the lateral cross-section, the included angle between adjacent two positioning blocks is less than or equal to 120 degrees.

3. The apparatus of claim 2, wherein, The positioning blocks are three, and the included angle between adjacent positioning blocks in the lateral cross-section is 120 degrees.

4. A method of ultrasonically inspecting the fit of a connecting rod bushing, characterized by, The device for ultrasonic detection of the connecting rod bushing adhesion comprises the following steps: Manufacture a standard sample and measure the standard ultrasonic echo signal of the connecting rod bushing adhesion in the standard sample; The plurality of positioning blocks move at a constant speed to the inner wall of the big-hole, and stop moving after touching the inner part of the big-hole; The connecting rod clamp moves and clamps the connecting rod to be detected; The ultrasonic probe moves to contact the bushing; The ultrasonic flaw detection card excites the ultrasonic probe to emit ultrasonic waves, and the ultrasonic flaw detection card acquires the ultrasonic echo signal of a detection point of the connecting rod to be detected; Compare the acquired ultrasonic echo signal of the detection point of the connecting rod to be detected with the standard ultrasonic echo signal, if the difference between the two exceeds a preset threshold, it is judged that the detection point is not adhered, otherwise, the detection point is adhered; Detect the plurality of detection points one by one and judge whether each detection point is adhered; Calculate the ratio of the total amount of adhered detection points to the total number of detection points to obtain the adhesion degree of the connecting rod bushing.

5. The method of claim 4, wherein, The standard sample is made of the material of the connecting rod and the material of the bushing, and a cuboid conforming to the preset length-width range and the preset thickness range is manufactured.

6. The method of claim 5, wherein, The pressure is calculated by the following formula:

7. The method of claim 6, wherein, Where: Δ is the interference, which is the difference between the outer diameter of the bushing and the inner diameter of the small end bore. ​ E 1、 E 2Elastic modulus of bushing and connecting rod material, respectively; ​ 1、 ​ 2 Poisson's ratio of bushing and connecting rod material, respectively; d 1、 d 2D and d are the inner diameter of the bushing and the outer diameter of the nose hole, respectively; d Nominal size of the bushing outside diameter or connecting rod small end bore inside diameter; P Standard bushing surface pressure.

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