Connecting rod bushing pull-out force detection device and detection method

Abstract

The present invention discloses a connecting rod bushing pull-out force detection device and detection method, comprising a base plate, a small head positioning device and a large head positioning core shaft are provided on the top surface of the base plate, the small head end of the connecting rod assembly is positioned and connected to the small head positioning device, and the large head end of the connecting rod assembly is positioned and connected to the large head positioning core shaft, and the large head positioning core shaft is slidably connected to the base plate through a connecting component; the small head positioning device is provided with an adjustment core shaft for initial installation, and an upper pressure head for detection is provided above the small head end of the connecting rod assembly. The measuring support block of the present invention adopts a profiling structure, and the measuring support block matches the small head end face of the connecting rod assembly, and is suitable for the pull-out force detection of bushings at the small head end of different types of connecting rods; the large head positioning core shaft is movable to meet the pull-out force detection of connecting rod bushings with different center distances; the upper pressure head adopts a profiling structure to meet the pull-out force detection of bushings with different shapes; the maximum force in the stroke pressure curve displayed by the servo press is defined as the pull-out force, and the operation is simple and the accuracy is high.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile connecting rod processing, and in particular to a connecting rod bushing pull-out force detection device and detection method. Background Art

[0002] During the production of automotive connecting rods, when the bushing is pressed into the bottom hole of the small end of the connecting rod, it is necessary to ensure that the bushing and the bottom hole of the small end have sufficient fit to avoid the risk of the bushing rotating when the engine is running. The commonly used method for testing the fit of the bushing is the grid method, which is to paint the outer diameter cylindrical surface of the bushing, press the bushing into the bottom hole of the small end with a press, and then press the bushing out with a press. The pressed bushing is rolled a full circle on the grid paper, and the bushing fit is calculated by calculating the ratio of the colored grid and the rolled grid. This method uses manual operation statistics, which is affected by the thickness of the paint and the pressing method. The results fluctuate greatly and the accuracy is poor. In view of the above situation, it is recommended to use the method of testing the pull-out force to indirectly reflect the fit between the bushing and the bottom hole of the small end.

[0003] A Chinese patent application numbered CN201910517852.0 discloses a connecting rod bushing fit detection tool and a detection method. The detection tool includes a cylindrical tool body with multiple arc-shaped detection windows provided along the circumference. It can ensure a high degree of fit accuracy between the connecting rod bushing and the tool body, and can accurately reflect the true shape of the connecting rod bushing in the connecting rod head. The connecting rod bushing fit detection method is as follows: first, the connecting rod bushing is pressed into the tooling body, the tooling body with the pressed connecting rod bushing is placed on the detection table, and the three-coordinate or cylindricity meter is calibrated; then the detection probe is used to measure the roundness of the outer surface of the connecting rod bushing at different heights in the detection window, and the measured data is fitted to obtain the cylindricity of the outer surface of the connecting rod bushing; finally, the fit is determined based on the cylindricity, and it is qualified if the cylindricity is within the specified range; it can quickly and accurately evaluate the fit rate between the connecting rod bushing and the connecting rod small head, and can avoid large data fluctuations caused by human operation; however, this method only detects the fit of the outer circle of the small head bushing of the single body, and cannot detect the fit between the bottom hole of the connecting rod small head and the bushing after they are matched. Summary of the Invention

[0004] The purpose of the present invention is to provide a connecting rod bushing pull-out force detection device and detection method, which solves the problems of complex operation of connecting rod bushing pull-out force detection and poor versatility of detection tooling in the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a connecting rod bushing pull-out force detection device, including a base plate, the top surface of the base plate is provided with a small head positioning device and a large head positioning core shaft, the small head end of the connecting rod assembly is positioned and connected to the small head positioning device, the large head end of the connecting rod assembly is positioned and connected to the large head positioning core shaft, and the large head positioning core shaft is slidably connected to the base plate through a connecting component; the small head positioning device is provided with an adjustment core shaft for initial installation, and an upper pressure head for detection is provided above the small head end of the connecting rod assembly.

[0007] Furthermore, a limiting hole is provided on one side of the top surface of the base plate, and the small head positioning device is fixedly connected in the limiting hole. A positioning groove is provided on the other side of the top surface of the base plate, and the large head positioning core shaft is slidably connected to the positioning groove through a connecting component.

[0008] Furthermore, the small head positioning device includes a small head positioning base and a measuring support block, the bottom surface of the measuring support block is welded to the top surface of the small head positioning base, and the measuring support block matches the small head end face of the connecting rod assembly; the bottom surface of the small head positioning base is provided with a limiting boss matching the limiting hole, the center of the small head positioning base is provided with a bushing blanking hole, and the top surface of the small head positioning base is provided with a small head forged outer circle limiting groove matching the outer contour of the small head end of the connecting rod assembly.

[0009] Furthermore, the big head positioning core shaft includes a big head positioning base, the top surface of the big head positioning base is connected with a positioning boss matching the through hole of the big head end of the connecting rod assembly, the bottom surface of the big head positioning base is connected with a positioning block matching the positioning groove, and the big head positioning base, the positioning boss and the positioning block are provided with a penetrating bolt hole in the center.

[0010] Furthermore, the connecting assembly includes a bolt and a locking block, the locking block is arranged in the positioning groove, and the bolt passes through the bolt hole and is locked in position by the locking block.

[0011] Furthermore, the upper pressure head includes a top block, a center core shaft and a sleeve, the top block is welded to the top surface of the center core shaft, the sleeve is sleeved on the outer circumferential surface of the center core shaft, the top surface of the sleeve is welded to the bottom surface of the top block, and the sleeve matches the small head end face of the connecting rod assembly.

[0012] Furthermore, the shaft sleeve and the central core shaft are in transition fit.

[0013] Furthermore, the adjustment core shaft includes a large diameter end and a small diameter end, the large diameter end matches the blanking hole of the bushing, and the small diameter end matches the inner hole of the small head bushing of the connecting rod assembly.

[0014] A connecting rod bushing pull-out force detection method is provided, which utilizes the connecting rod bushing pull-out force detection device as described above to perform detection, and specifically comprises the following steps:

[0015] Step 1, aligning the position of the big head positioning mandrel: insert the large diameter end of the adjustment mandrel into the bushing blanking hole on the small head positioning base, position and connect the small head end of the connecting rod assembly to the small diameter end, and then adjust the position of the big head positioning mandrel according to the center distance of the through holes at both ends of the connecting rod assembly so that the big head end of the connecting rod assembly is positioned and connected to the big head positioning mandrel, then pass the bolt through the bolt hole and lock it in position with the locking block, fix the position of the big head positioning mandrel, and complete the alignment of the position of the big head positioning mandrel;

[0016] Step 2: Disassembly of the adjustment mandrel: remove the connecting rod assembly and then remove the adjustment mandrel;

[0017] Step 3, secondary installation of the connecting rod: positioning and connecting the big end of the connecting rod assembly to the big end positioning core shaft, and positioning and connecting the small end of the connecting rod assembly to the small end positioning device;

[0018] Step 4, connecting rod inspection operation: place the upper pressure head flat on the small head end face of the connecting rod assembly, start the servo press, and the servo press presses the upper pressure head downward. The upper pressure head presses out the small head bushing, and the small head bushing falls into the bushing blanking hole on the small head positioning base. The maximum force in the stroke pressure curve displayed by the servo press is defined as the pull-out force, and the pull-out force obtained by the test is compared with the theoretically designed pull-out force to confirm whether the pull-out force is qualified.

[0019] Furthermore, in step one, the adjustment mandrel is used in the process of aligning the position of the big head positioning mandrel. When the position of the big head positioning mandrel is determined, the adjustment mandrel can be removed; when the center distance of the connecting rod assembly to be detected changes, the adjustment mandrel needs to be used to re-determine the position of the big head positioning mandrel.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] The present invention discloses a connecting rod bushing pull-out force detection device and detection method. The small head positioning device is welded and assembled with a small head positioning base and a measuring support block. The small head end face can be immediately supported during the detection process. The measuring support block adopts a contoured structure and is custom-designed and manufactured according to the shape of the small head end of the connecting rod to be measured. The measuring support block matches the small head end face of the connecting rod assembly. When in use, the small head end face of the connecting rod assembly fits with the top surface of the measuring support block to ensure uniform force, which can meet the detection of the pull-out force of bushings of small head end faces with different structures and can be applicable to the detection of the pull-out force of bushings of small head ends of different types of connecting rods. At the same time, the detection is convenient, reliable and low in cost. , high efficiency; the big head positioning core shaft can move along the positioning groove, which can meet the detection of the pull-out force of connecting rod bushings with different center distances and has strong versatility; the upper pressure head adopts a contoured structure and is customized according to the shape of the connecting rod bushing to be measured, so that the bushing cross section is evenly stressed during the pull-out force measurement, which can meet the detection of the pull-out force of bushings with different shapes; a servo press that can display the pressure-stroke curve in real time is used for detection test, and the maximum force in the stroke pressure curve displayed by the servo press is defined as the pull-out force, so as to confirm whether the pull-out force is qualified. It is simple to operate and has high accuracy, and it well realizes the detection test of the pull-out force of the connecting rod assembly bushing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 A cross-sectional view of the connecting rod bushing pull-out force detection device of the present invention during detection;

[0024] Figure 2 This is a cross-sectional view of the connecting rod bushing pull-out force detection device of the present invention when it is first installed;

[0025] Figure 3 A top view of a connecting rod bushing pull-out force detection device according to the present invention;

[0026] Figure 4 is a cross-sectional view of the upper pressure head of the present invention;

[0027] Figure 5 Schematic diagram of the structure of the small head positioning device of the present invention;

[0028] Figure 6 This is a schematic structural diagram of the big head positioning mandrel of the present invention;

[0029] Explanation of the accompanying symbols: 1. Upper pressure head; 101. Ejector block; 102. Center mandrel; 103. Bushing; 2. Small head positioning device; 201. Small head positioning base; 202. Measuring support block; 201-1. Bushing blanking hole; 201-2. Small head forging outer circle limiting groove; 3. Big head positioning mandrel; 301. Big head positioning base; 302. Positioning boss; 303. Positioning block; 304. Bolt hole; 4. Bottom plate; 401. Positioning groove; 402. Limiting hole; 5. Adjusting mandrel; 501. Large diameter end; 502. Small diameter end; 6. Bolt; 7. Locking block; 8. Connecting rod assembly; 801. Small head bushing;

[0030] Φd, small head hole diameter; φd1, connecting rod small head bottom hole diameter; φd2, bushing blanking hole diameter; φD, small head forging outer diameter; d3, small head forging outer circle limit groove width; φd4, center core shaft diameter; φd5, sleeve lower part outer diameter. DETAILED DESCRIPTION

[0031] like Figure 1-6 As shown, a connecting rod bushing pull-out force detection device includes a base plate 4, the top surface of the base plate 4 is provided with a small head positioning device 2 and a large head positioning core shaft 3, the small head end of the connecting rod assembly 8 is positioned and connected to the small head positioning device 2, the large head end of the connecting rod assembly 8 is positioned and connected to the large head positioning core shaft 3, and the large head positioning core shaft 3 is slidably connected to the base plate 4 through a connecting component; the small head positioning device 2 is provided with an adjustment core shaft 5 for initial installation, and an upper pressure head 1 for detection is provided above the small head end of the connecting rod assembly 8; the connecting rod assembly of the present invention is positioned by the positioning end surface formed by the combination of the large head positioning core shaft, the small head positioning device and the supporting surfaces of the two; during the first installation, The adjustment core shaft 5 is placed on the small head positioning device 2, and the position of the big head positioning core shaft is adjusted by placing the connecting rod assembly and locked; the big head positioning core shaft is a cylindrical pin, which can indirectly locate the position of the connecting rod small head in the center distance direction through the center distance of the connecting rod large and small holes; the limit size of the small head positioning device 2 fully considers the forging tolerance, and continuous testing can be performed after the first adjustment is completed; the big head positioning core shaft can be moved along the positioning groove for easy adjustment; during the inspection, a servo press that can display the pressure-stroke curve in real time is used for inspection and the maximum force in the stroke pressure curve displayed by the servo press is defined as the pull-out force to confirm whether the pull-out force is qualified. The operation is simple and the accuracy is high, which well realizes the detection test of the pull-out force of the connecting rod assembly bushing.

[0032] Specifically, a limiting hole 402 is opened on one side of the top surface of the base plate 4, and the small head positioning device 2 is fixedly connected in the limiting hole 402. A positioning groove 401 is provided on the other side of the top surface of the base plate 4, and the large head positioning core shaft 3 is slidably connected to the positioning groove 401 through a connecting component; specifically, a limiting block matching the limiting hole 402 is provided at the lower part of the small head positioning base 2, and the limiting block can be fixed by directly placing it in the limiting hole 402; the positioning groove 401 is set as a T-shaped positioning groove, and the large head positioning core shaft can move along the T-shaped positioning groove for easy adjustment; the relative position of the large head positioning core shaft positioning block and the base plate T-shaped positioning groove is adjusted to meet the detection of the connecting rod bushing pull-out force with different center distances.

[0033] like Figure 1 、 5 As shown, the small head positioning device 2 includes a small head positioning base 201 and a measuring support block 202. The bottom surface of the measuring support block 202 is welded to the top surface of the small head positioning base 201. The measuring support block 202 matches the small head end face of the connecting rod assembly 8 and is used to support the small head inclined surface to prevent the connecting rod from tilting during detection and causing detection failure; the bottom surface of the small head positioning base 201 is provided with a limiting boss matching the limiting hole 402, and the small head The center of the positioning base 201 is provided with a bushing blanking hole 201-1 for receiving the bushing dropped during the detection process. The top surface of the small head positioning base 201 is provided with a small head forged outer circle limiting groove 201-2 that matches the outer contour of the small head end of the connecting rod assembly 8; specifically, the bushing blanking hole diameter Φd2 = φd1 + 1mm, the small head forged outer circle limiting groove width d3 = φD + 0.8mm; the small head positioning base is assembled by welding two parts, and during the detection process The small end face of the connecting rod can be immediately supported to avoid tilting and causing detection failure. There are several forms of the small end face of the connecting rod: the small end face has an inorganic machined bevel, the small end face has an organic machined bevel, and the small end face is a forged special-shaped surface. The measuring support block 202 adopts a contoured structure and is custom-designed and manufactured according to the shape of the small end of the connecting rod to be measured. The measuring support block 202 matches the small end face of the connecting rod assembly. When in use, the small end face of the connecting rod assembly fits with the top surface of the measuring support block 202 to ensure that the small end face is properly measured. The force is uniform, which can meet the test of the pull-out force of the bushing on the small head end face with different structures; when the small head end face of the connecting rod assembly is an inclined surface, the inclination angle of the top surface of the measuring support block is determined according to the inclination angle of the small head end face of the connecting rod assembly, which can meet the test of the pull-out force of the bushing on the small head end face with different inclination angles; the skirt of the small head positioning base is used to limit the size of the forged outer circle of the small head end, thereby limiting the coaxiality of the bushing and the blanking hole, ensuring that the bushing falls smoothly into the bushing blanking hole of the small head positioning base during the pull-out force test.

[0034] like Figure 6As shown, the big head positioning core shaft 3 includes a big head positioning base 301, the top surface of the big head positioning base 301 is connected with a positioning boss 302 matching the through hole of the big head end of the connecting rod assembly 8, and the bottom surface of the big head positioning base 301 is connected with a positioning block 303 matching the positioning groove 401, and the big head positioning base 301, the positioning boss 302 and the positioning block 303 are centrally provided with a through bolt hole 304; specifically, the big head positioning core shaft is a cylindrical pin, the diameter of the cylindrical pin = the lower limit of the connecting rod large hole diameter (-0.06, -0.04) mm, and the position of the connecting rod small head in the center distance direction is indirectly positioned by the center distance of the connecting rod large and small holes, thereby ensuring that the bushing accurately falls into the blanking hole when pressed out.

[0035] like Figure 1 As shown, the connecting assembly includes a bolt 6 and a locking block 7. The locking block 7 is disposed in the positioning groove 401. The bolt 6 passes through the bolt hole 304 and is locked in place by the locking block 7.

[0036] like Figure 4 As shown, the upper pressure head 1 includes a top block 101, a center core shaft 102 and a sleeve 103. The top block 101 is welded to the top surface of the center core shaft 102, and the sleeve 103 is sleeved on the outer peripheral surface of the center core shaft 102. The top surface of the sleeve 103 is welded to the bottom surface of the top block 101. The sleeve 103 matches the small end face of the connecting rod assembly 8; the sleeve 103 and the center core shaft 102 are transition fit; specifically, the diameter of the center core shaft is φd4=φd-0.05mm, outer diameter of the lower part of the sleeve φd5=φd1(-0.1, -0.05)mm, the longitudinal section shape of the lower part of the sleeve is the same as the end face of the small end of the connecting rod, to ensure that the sleeve is evenly stressed when the upper pressure head presses down; the upper pressure head adopts a contoured structure, which is custom-designed and manufactured according to the shape of the connecting rod bushing to be measured, so that the cross section of the sleeve is evenly stressed when the pull-out force is measured, avoiding deviation and causing errors in the pull-out force measurement, and can meet the detection of the pull-out force of bushings with different shapes.

[0037] like Figure 2 As shown, the adjustment core shaft 5 includes a large diameter end 501 and a small diameter end 502, the large diameter end 501 matches the bushing blanking hole 201-1, and the small diameter end 502 matches the inner hole of the small head bushing 801 of the connecting rod assembly 8; the positioning adjustment core shaft is used to adjust the position of the fixed large head hole positioning core shaft during the first assembly.

[0038] A connecting rod bushing pull-out force detection method is provided, which utilizes the connecting rod bushing pull-out force detection device as described above to perform detection, and specifically comprises the following steps:

[0039] Step 1, aligning the position of the big head positioning mandrel: insert the large diameter end 501 of the adjustment mandrel 5 into the bushing blanking hole 201-1 on the small head positioning base 201, position and connect the small head end of the connecting rod assembly 8 to the small diameter end 502, and then adjust the position of the big head positioning mandrel 3 according to the center distance of the through holes at both ends of the connecting rod assembly 8, so that the big head end of the connecting rod assembly 8 is positioned and connected to the big head positioning mandrel 3, then pass the bolt 6 through the bolt hole 304 and lock it in position through the locking block 7, fix the position of the big head positioning mandrel 3, and complete the alignment of the position of the big head positioning mandrel;

[0040] Step 2: Disassembly of the adjustment mandrel: remove the connecting rod assembly 8, and then remove the adjustment mandrel 5;

[0041] Step 3, secondary installation of the connecting rod: the big end of the connecting rod assembly 8 is positioned and connected to the big end positioning core shaft 3, and the small end of the connecting rod assembly 8 is positioned and connected to the small end positioning device 2;

[0042] Step 4, connecting rod inspection operation: place the upper pressure head 1 flat on the small head end face of the connecting rod assembly 8, start the servo press, and the servo press presses the upper pressure head 1 downward. The upper pressure head 1 presses out the small head bushing 801, and the small head bushing 801 falls into the bushing blanking hole 201-1 on the small head positioning base 201. The maximum force in the stroke pressure curve displayed by the servo press is defined as the pull-out force, and the pull-out force obtained by the test is compared with the theoretically designed pull-out force to confirm whether the pull-out force is qualified.

[0043] Specifically, in step one, the adjustment spindle 5 is used in the process of aligning the position of the big head positioning spindle. When the position of the big head positioning spindle 3 is determined, the adjustment spindle 5 can be removed. After the first adjustment is completed, there is no need to adjust it again, and continuous testing is performed afterwards; when it is necessary to detect the change in the center distance of the connecting rod assembly 8, it is necessary to use the adjustment spindle 5 to re-determine the position of the big head positioning spindle 3.

[0044] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A connecting rod bushing pull-out force detection device, characterized in that: The invention comprises a base plate (4), wherein a small head positioning device (2) and a large head positioning core shaft (3) are provided on the top surface of the base plate (4), the small head end of the connecting rod assembly (8) is positioned and connected to the small head positioning device (2), the large head end of the connecting rod assembly (8) is positioned and connected to the large head positioning core shaft (3), and the large head positioning core shaft (3) is slidably connected to the base plate (4) through a connecting component; an adjustment core shaft (5) for initial installation is provided on the small head positioning device (2), and an upper pressure head (1) for detection is provided above the small head end of the connecting rod assembly (8), and the upper pressure head (1) adopts a contouring structure; The small head positioning device (2) comprises a small head positioning base (201) and a measuring support block (202), the bottom surface of the measuring support block (202) is welded to the top surface of the small head positioning base (201), the measuring support block (202) matches the small head end surface of the connecting rod assembly (8), the measuring support block (202) adopts a contoured structure, and the small head end surface of the connecting rod assembly (8) is fitted with the top surface of the measuring support block (202); the bottom surface of the small head positioning base (201) is provided with a limiting boss matching the limiting hole (402), the center of the small head positioning base (201) is provided with a bushing blanking hole (201-1), and the top surface of the small head positioning base (201) is provided with a small head forged outer circle limiting groove (201-2) matching the outer contour of the small head end of the connecting rod assembly (8).

2. The connecting rod bushing pull-out force detection device according to claim 1, characterized in that: A limiting hole (402) is provided on one side of the top surface of the base plate (4), and the small head positioning device (2) is fixedly connected in the limiting hole (402). A positioning groove (401) is provided on the other side of the top surface of the base plate (4), and the large head positioning core shaft (3) is slidably connected to the positioning groove (401) through a connecting assembly.

3. The connecting rod bushing pull-out force detection device according to claim 2, characterized in that: The big head positioning spindle (3) includes a big head positioning base (301), the top surface of the big head positioning base (301) is connected to a positioning boss (302) matching the through hole of the big head end of the connecting rod assembly (8), the bottom surface of the big head positioning base (301) is connected to a positioning block (303) matching the positioning groove (401), and the centers of the big head positioning base (301), the positioning boss (302) and the positioning block (303) are provided with a through bolt hole (304).

4. The connecting rod bushing pull-out force detection device according to claim 3, characterized in that: The connecting assembly comprises a bolt (6) and a locking block (7), wherein the locking block (7) is arranged in the positioning groove (401), and the bolt (6) is locked in position by the locking block (7) after passing through the bolt hole (304).

5. The connecting rod bushing pull-out force detection device according to claim 1, characterized in that: The upper pressure head (1) comprises a top block (101), a center core shaft (102) and a sleeve (103), wherein the top block (101) is welded to the top surface of the center core shaft (102), and the sleeve (103) is sleeved on the outer peripheral surface of the center core shaft (102), and the top surface of the sleeve (103) is welded to the bottom surface of the top block (101), and the sleeve (103) matches the small end surface of the connecting rod assembly (8).

6. The connecting rod bushing pull-out force detection device according to claim 5, characterized in that: The shaft sleeve (103) and the central core shaft (102) are in transition fit.

7. The connecting rod bushing pull-out force detection device according to claim 4, characterized in that: The adjusting core shaft (5) comprises a large diameter end (501) and a small diameter end (502), wherein the large diameter end (501) matches the bushing blanking hole (201-1), and the small diameter end (502) matches the inner hole of the small head bushing (801) of the connecting rod assembly (8).

8. A method for detecting the pull-out force of a connecting rod bushing, using the connecting rod bushing pull-out force detection device according to claim 7, characterized in that: The specific steps include: Step 1, alignment of the position of the large head positioning core shaft: insert the large diameter end (501) of the adjustment core shaft (5) into the bushing blanking hole (201-1) on the small head positioning base (201), position and connect the small head end of the connecting rod assembly (8) to the small diameter end (502), then adjust the position of the large head positioning core shaft (3) according to the center distance of the through holes at both ends of the connecting rod assembly (8), so that the large head end of the connecting rod assembly (8) is positioned and connected to the large head positioning core shaft (3), then pass the bolt (6) through the bolt hole (304) and lock it in position through the locking block (7), fix the position of the large head positioning core shaft (3), and complete the alignment of the position of the large head positioning core shaft; Step 2, disassembly of the adjustment mandrel: remove the connecting rod assembly (8), and then remove the adjustment mandrel (5); Step 3, secondary installation of the connecting rod: the large end of the connecting rod assembly (8) is positioned and connected to the large end positioning core shaft (3), and the small end of the connecting rod assembly (8) is positioned and connected to the small end positioning device (2); Step 4, connecting rod inspection operation: the upper pressure head (1) is placed flat on the small head end face of the connecting rod assembly (8), the servo press is started, and the servo press press presses the upper pressure head (1) downward, the upper pressure head (1) presses out the small head bushing (801), and the small head bushing (801) falls into the bushing blanking hole (201-1) on the small head positioning base (201), and the maximum force in the stroke pressure curve displayed by the servo press is defined as the pull-out force, and the pull-out force obtained by the test is compared with the theoretically designed pull-out force to confirm whether the pull-out force is qualified.

9. The connecting rod bushing pull-out force detection method according to claim 8, characterized in that: In the step 1, the adjusting mandrel (5) is used in the process of aligning the position of the large head positioning mandrel. When the position of the large head positioning mandrel (3) is determined, the adjusting mandrel (5) can be removed. When the center distance of the connecting rod assembly (8) to be detected changes, the adjusting mandrel (5) needs to be used to re-determine the position of the large head positioning mandrel (3).

Images