Crankshaft connecting disc comprehensive measuring device

Abstract

The invention discloses a comprehensive measuring device for a crankshaft connecting disc, and relates to the technical field of mechanical part detection. The first measuring claw is used for measuring a first shaft diameter of the crankshaft connecting disc, the first measuring claw is fixedly arranged on the fixing plate, and the first measuring claw is provided with a first positioning groove used for supporting a first shaft body of the crankshaft connecting disc; the second measuring claw is used for measuring a second shaft diameter of the crankshaft connecting disc, the second measuring claw is arranged on the fixing plate in a floating manner, and the second measuring claw is provided with a second positioning groove used for supporting a second shaft body of the crankshaft connecting disc; the displacement sensor is arranged on the fixing plate and used for measuring the floating displacement amount of the second measuring claw; the first measuring claw and the second measuring claw are both provided with air gauges. The comprehensive measuring device for the crankshaft connecting disc has low requirements on skills of workers, can be used for detection by the workers at the production line, meets the requirement of nearby rapid measurement during on-site mass production in a workshop, improves the detection efficiency, and is matched with the rhythm of mass production.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical parts detection, in particular to a crankshaft connecting disc comprehensive measuring device. Background Art

[0002] A motorcycle engine's split multi-cylinder crankshaft is typically assembled from left and right cranks, a connecting rod, a crankpin, and a connecting plate. Specifically, the crankshaft connecting plate comprises a first and second shaft. The center distance of the crankshaft connecting plate is the distance between the centers of the first and second shafts, and the shaft diameter of the crankshaft connecting plate comprises the diameters of the first and second shafts. High precision is required for the crankshaft connecting plate, with a center distance tolerance of ±0.02mm and a shaft diameter tolerance of within 0.015mm.

[0003] In the existing technology, the accuracy detection of crankshaft connecting plates often relies on three-coordinate measurement equipment, which is not only costly but also requires specialized inspection personnel to perform the inspection. It has high requirements on the personnel's skills and cannot meet the on-site measurement needs of front-line production employees, nor can it match the rhythm of mass production.

[0004] Therefore, there are still shortcomings and deficiencies in the existing technology. How to provide a crankshaft connecting plate comprehensive measuring device that is easy to detect and can match the rhythm of mass production is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0005] The purpose of the present invention is to provide a comprehensive measuring device for crankshaft connecting plates, which solves the technical problem that the accuracy detection of crankshaft connecting plates in the existing technology relies on three-coordinate equipment, which is not only costly but also requires specialized testing personnel to perform testing, has high requirements on personnel skills, cannot meet the on-site measurement needs of front-line production employees, and cannot match the rhythm of mass production.

[0006] To achieve the above object, the present invention provides a crankshaft connecting plate comprehensive measuring device, comprising:

[0007] Fixed plate;

[0008] a first measuring jaw for measuring a first shaft diameter of the crankshaft connecting plate, wherein the first measuring jaw is fixed to the fixing plate and is provided with a first positioning groove for supporting a first shaft body of the crankshaft connecting plate;

[0009] a second measuring jaw for measuring a second shaft diameter of the crankshaft connecting plate, the second measuring jaw being floatingly disposed on the fixing plate, the second measuring jaw being provided with a second positioning groove for supporting the second shaft body of the crankshaft connecting plate;

[0010] a displacement sensor, disposed on the fixed plate, and configured to measure a floating displacement of the second measuring claw;

[0011] Wherein, the first measuring claw and the second measuring claw are both connected to a pneumatic measuring instrument.

[0012] Preferably, a mounting groove is provided on a side of the second measuring claw close to the fixing plate, a compression spring is provided in the mounting groove, and the compression spring is limited between the top of the fixing plate and the end surface of the mounting groove.

[0013] Preferably, the fixing plate is further fixed with a positioning guide block, and the displacement sensor is installed on the positioning guide block.

[0014] Preferably, a sliding groove is provided at the bottom of the second measuring claw, the positioning guide block is at least partially located in the sliding groove, and the second measuring claw is slidably connected to the positioning guide block through the sliding groove.

[0015] Preferably, an accommodating cavity is further provided in the second measuring claw, and two ends of the accommodating cavity are respectively communicated with the second positioning groove and the sliding groove.

[0016] Preferably, the displacement sensor is at least partially located in the accommodating cavity, and a gap is left between the displacement sensor and a side wall of the accommodating cavity.

[0017] Preferably, the second measuring claw is further provided with a second screw, the second screw passes through the mounting slot and is connected to the fixing plate, and the compression spring is sleeved on the outside of the second screw.

[0018] Preferably, the first measuring claw is fixed to the fixing plate by a first screw.

[0019] Preferably, the first positioning groove includes two symmetrically arranged first positioning support surfaces, and the two first positioning support surfaces are distributed in a V shape.

[0020] Preferably, the second positioning groove includes two symmetrically arranged second positioning support surfaces, and the two second positioning support surfaces are distributed in a V shape.

[0021] Compared with the above-mentioned background technology, the crankshaft connecting plate comprehensive measuring device provided by the present invention can quickly and accurately measure the shaft diameter of the crankshaft connecting plate through the pneumatic measuring instrument of the first measuring jaw and the second measuring jaw. The center distance of the crankshaft connecting plate is obtained by jointly calculating the shaft diameter of the crankshaft connecting plate and the floating displacement data of the displacement sensor, thereby realizing simultaneous detection of the shaft diameter and center distance of the crankshaft connecting plate. No special inspection personnel are required for inspection, and the personnel skill requirements are low. The front-line production staff can perform the inspection, which meets the needs of local and rapid measurement during mass production in the workshop, improves the inspection efficiency, and matches the rhythm of mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0023] Figure 1 A schematic structural diagram of a crankshaft connecting plate provided in an embodiment of the present invention;

[0024] Figure 2 A schematic structural diagram of a crankshaft connecting plate provided by an embodiment of the present invention from another perspective;

[0025] Figure 3 A schematic structural diagram of a crankshaft connecting plate comprehensive measuring device provided by an embodiment of the present invention;

[0026] Figure 4 A schematic structural diagram of the crankshaft connecting plate comprehensive measuring device from another perspective provided by an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of the crankshaft connecting plate comprehensive measuring device provided by an embodiment of the present invention during measurement;

[0028] Figure 6 A schematic diagram of another perspective of the crankshaft connecting plate comprehensive measuring device provided by an embodiment of the present invention during measurement.

[0029] Figures 1 to 6 Reference numerals in the accompanying drawings: 1. crankshaft connecting plate; 11. first shaft body; 12. second shaft body; 2. fixing plate; 3. first measuring claw; 31. first positioning groove; 311. first positioning support surface; 4. second measuring claw; 41. second positioning groove; 411. second positioning support surface; 42. mounting groove; 43. slide groove; 44. accommodating chamber; 5. displacement sensor; 6. compression spring; 7. positioning guide block; 8. first screw; 9. second screw. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In order to enable those skilled in the art to better understand the solutions of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0032] The present invention provides a crankshaft connecting plate comprehensive measuring device, which can realize the simultaneous detection of the shaft diameter and center distance of the crankshaft connecting plate 1, does not require special detection personnel to perform the detection, has low personnel skill requirements, and matches the rhythm of mass production.

[0033] Please refer to Figures 1 to 6 The crankshaft connecting plate comprehensive measuring device provided by the present invention comprises:

[0034] Fixed plate 2;

[0035] a first measuring jaw 3 for measuring the first shaft diameter of the crankshaft connecting plate 1 , the first measuring jaw 3 being fixed to the fixing plate 2 , and the first measuring jaw 3 being provided with a first positioning groove 31 for supporting the first shaft body 11 of the crankshaft connecting plate 1 ;

[0036] A second measuring jaw 4 for measuring the second shaft diameter of the crankshaft connecting plate 1 , the second measuring jaw 4 being floatingly disposed on the fixing plate 2 , and the second measuring jaw 4 being provided with a second positioning groove 41 for supporting the second shaft body 12 of the crankshaft connecting plate 1 ;

[0037] The displacement sensor 5 is provided on the fixed plate 2 and is used to measure the floating displacement of the second measuring claw 4;

[0038] The first measuring jaw 3 and the second measuring jaw 4 are both connected to a pneumatic measuring instrument. A pneumatic measuring instrument is a non-contact precision measuring instrument based on pneumatic principles. It measures length by converting airflow signals and is suitable for rapid detection of parameters such as inner diameter, outer diameter, thickness, and shape error.

[0039] During measurement, the crankshaft connecting plate 1 is placed in the comprehensive measuring device provided in this embodiment, the first shaft body 11 of the crankshaft connecting plate 1 is located in the first positioning groove 31 of the first measuring claw 3, and the second shaft body 12 of the crankshaft connecting plate 1 is located in the second positioning groove 41 of the second measuring claw 4. The first measuring claw 3 and the second measuring claw 4 are both connected to the pneumatic measuring instrument, and the shaft diameter of the first shaft body 11 and the shaft diameter of the second shaft body 12 are quickly and accurately measured by the pneumatic measuring instrument.

[0040] The center distance measurement of the crankshaft connecting plate 1 relies on a combined calculation of the floating displacement data from the displacement sensor 5 and the shaft diameter measurement. Based on the values ​​d1 and d2 measured by the first and second measuring jaws 3 and 4, respectively, and the value measured by the displacement sensor 5, a systematic error analysis is performed to calculate the influence of d1 and d2 due to the changes in the shaft diameter and the value measured by the displacement sensor 5, thereby accurately determining the center distance.

[0041] The crankshaft connecting plate comprehensive measuring device provided by the present invention is not only low-cost, but also can realize the simultaneous detection of the shaft diameter and center distance of the crankshaft connecting plate 1. It does not require special inspection personnel to perform the inspection, and has low requirements on personnel skills. Front-line production employees can perform the inspection, which meets the needs of local rapid measurement during large-scale production in the workshop, improves the inspection efficiency, and matches the rhythm of large-scale production.

[0042] In some embodiments, please refer to Figures 3 to 6 A mounting groove 42 is provided on one side of the second measuring claw 4 close to the fixed plate 2 , and a compression spring 6 is provided in the mounting groove 42 . The compression spring 6 is limited between the top of the fixed plate 2 and the end surface of the mounting groove 42 .

[0043] There are two mounting slots 42, located on either side of the bottom of the second measuring jaw 4. A compression spring 6 is provided to allow the second measuring jaw 4 to be floatingly mounted on the fixed plate 2. This allows the accurate center distance to be calculated based on the values ​​d1 and d2 measured by the first and second measuring jaws 3 and 4, respectively, and the floating displacement of the second measuring jaw 4 measured by the displacement sensor 5.

[0044] In some embodiments, please refer to Figures 3 to 6 The fixed plate 2 is also fixed with a positioning guide block 7, and the displacement sensor 5 is installed on the positioning guide block 7.

[0045] When the second measuring claw 4 floats, the displacement sensor 5 will not float with the second measuring claw 4 , so the floating displacement of the second measuring claw 4 can be accurately measured by the displacement sensor 5 installed on the positioning guide block 7 .

[0046] In some embodiments, please refer to Figures 3 to 6 A slide groove 43 is provided at the bottom of the second measuring claw 4 , and the positioning guide block 7 is at least partially located in the slide groove 43 . The second measuring claw 4 is slidably connected to the positioning guide block 7 through the slide groove 43 .

[0047] The slide groove 43 extends in the vertical direction, and the positioning guide block 7 is slidably connected to the slide groove 43. Through the cooperation between the slide groove 43 and the positioning guide block 7, when the second measuring claw 4 floats under the action of the compression spring 6, the deviation of the second measuring claw 4 in other directions can be limited, and the floating of the second measuring claw 4 can be guided to ensure that the second measuring claw 4 floats in the vertical direction, thereby ensuring the accuracy of the floating displacement of the second measuring claw 4 measured by the displacement sensor 5.

[0048] The cross section of the positioning guide block 7 is a rectangular structure. The cross section shape of the positioning guide block 7 is adapted to the shape of the sliding groove 43 and can play a positioning and guiding role.

[0049] In some embodiments, please refer to Figures 3 to 6A receiving cavity 44 is further provided in the second measuring claw 4 , and both ends of the receiving cavity 44 are respectively connected to the second positioning groove 41 and the sliding groove 43 .

[0050] In some embodiments, please refer to Figures 1 to 6 The displacement sensor 5 is at least partially located in the accommodating cavity 44 , and a gap is left between the displacement sensor 5 and the side wall of the accommodating cavity 44 .

[0051] The gap between the displacement sensor 5 and the side wall of the accommodating cavity 44 ensures that the floating of the second measuring claw 4 will not affect the displacement sensor 5 , thereby ensuring the accuracy of the floating displacement of the second measuring claw 4 measured by the displacement sensor 5 .

[0052] In some embodiments, please refer to Figures 3 to 6 The second measuring jaw 4 is further provided with a second screw 9, which passes through the mounting slot 42 and is connected to the fixing plate 2. The compression spring 6 is sleeved on the outside of the second screw 9. Specifically, the second screw 9 has an interference fit with the fixing plate 2, while the second screw 9 has a clearance fit with the second measuring jaw 4. The second screw 9 achieves a floating connection between the second measuring jaw 4 and the fixing plate 2, ensuring structural stability and serving as a guide, ensuring that the second measuring jaw 4 floats in the vertical direction, thereby reducing errors caused by the deviation of the second measuring jaw 4.

[0053] In some embodiments, please refer to Figures 3 to 6 The first measuring claw 3 is fixed to the fixing plate 2 by a first screw 8 .

[0054] There are two first screws 8 , which are symmetrically distributed on both sides of the first measuring claw 3 . The first measuring claw 3 is reliably fixed to the fixing plate 2 by the first screws 8 on both sides of the first measuring claw 3 .

[0055] In some embodiments, please refer to Figures 3 to 6 The first positioning groove 31 includes two symmetrically arranged first positioning support surfaces 311, and the two first positioning support surfaces 311 are distributed in a V shape.

[0056] When the crankshaft connecting plate 1 is placed on the integrated measuring device provided in this embodiment, the first shaft body 11 is located in the first positioning groove 31 of the first measuring claw 3, and the two first positioning support surfaces 311 are respectively abutted against the two sides of the bottom of the first measuring claw 3, thereby positioning and supporting the first shaft body 11.

[0057] In some embodiments, please refer to Figures 3 to 6 The second positioning groove 41 includes two symmetrically arranged second positioning support surfaces 411, and the two second positioning support surfaces 411 are distributed in a V shape.

[0058] When the crankshaft connecting plate 1 is placed on the integrated measuring device provided in this embodiment, the second shaft body 12 is located in the second positioning groove 41 of the second measuring claw 4, and the two second positioning support surfaces 411 are respectively abutted against the two sides of the bottom of the second measuring claw 4, thereby positioning and supporting the second shaft body 12.

[0059] Specifically, the crankshaft connecting plate comprehensive measuring device provided by the present invention can include the following steps for measuring the center distance of the crankshaft connecting plate 1:

[0060] 1. Calibration of standard parts

[0061] The center distance is , shaft diameters are and The standard part is loaded into the crankshaft connecting plate integrated measuring device, and the first measuring claw 3 and the second measuring claw 4 support and position the standard part; the position at this time is recorded as the reference zero point by the displacement sensor 5 ( ).

[0062] 2. DUT measurement

[0063] After the workpiece is loaded into the crankshaft connecting plate integrated measuring device, the shaft diameter is measured by the first measuring claw 3 , the shaft diameter is measured by the second measuring claw 4 , the floating displacement of the second measuring claw 4 is measured by the displacement sensor 5 .in, for and The difference, for and The difference.

[0064] 3. Center distance calculation

[0065] Center distance of the test piece ,in, is the floating displacement directly measured by the displacement sensor 5; is the compensation item for shaft diameter deviation (used to eliminate V-type positioning error); 、 is the compensation coefficient ( 、 Determined by the angle θ of the V-shaped positioning groove, usually when θ=90°, = =0.707).

[0066] In some embodiments, the crankshaft connecting plate comprehensive measuring device provided by the present invention further includes a control device and a display device, and the first measuring claw 3 and the second measuring claw 4 measure the shaft diameter of the crankshaft connecting plate 1 through a pneumatic measuring instrument. and After that, the measurement result is converted into a digital signal, the digital signal is transmitted to the control device, the measured shaft diameter value is compared with the required value, and the measured shaft diameter value is displayed on the display device. If the tolerance between the measured shaft diameter value and the required value is within the tolerance range, it will be displayed in green. If it exceeds the tolerance range, it will be displayed in red and an alarm will be issued.

[0067] After the center distance of the crankshaft connecting plate 1 is calculated by the control system, the display device displays the center distance value, and compares the center distance value with the required value. If the tolerance between the center distance value and the required value is within the tolerance range, it will be displayed green. If it exceeds the tolerance range, it will be displayed red and an alarm will be issued.

[0068] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0069] The principles and implementation methods of the present invention are described herein using specific examples. The description of the above examples is only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A crankshaft connecting plate comprehensive measuring device, characterized in that: include: Fixed plate (2); a first measuring claw (3) for measuring a first shaft diameter of a crankshaft connecting plate (1), wherein the first measuring claw (3) is fixed to the fixing plate (2), and the first measuring claw (3) is provided with a first positioning groove (31) for supporting a first shaft body (11) of the crankshaft connecting plate (1); a second measuring claw (4) for measuring a second shaft diameter of the crankshaft connecting plate (1), the second measuring claw (4) being floatingly arranged on the fixing plate (2), and the second measuring claw (4) being provided with a second positioning groove (41) for supporting a second shaft body (12) of the crankshaft connecting plate (1); A displacement sensor (5) is provided on the fixed plate (2), and the displacement sensor (5) is used to measure the floating displacement of the second measuring claw (4); Wherein, the first measuring claw (3) and the second measuring claw (4) are both connected to a pneumatic measuring instrument.

2. The crankshaft connecting plate comprehensive measuring device according to claim 1, characterized in that: A mounting groove (42) is provided on a side of the second measuring claw (4) close to the fixing plate (2), a compression spring (6) is provided in the mounting groove (42), and the compression spring (6) is limited between the top of the fixing plate (2) and the end surface of the mounting groove (42).

3. The crankshaft connecting plate comprehensive measuring device according to claim 1, characterized in that: The fixed plate (2) is also fixedly provided with a positioning guide block (7), and the displacement sensor (5) is mounted on the positioning guide block (7).

4. The crankshaft connecting plate comprehensive measuring device according to claim 3, characterized in that: A sliding groove (43) is provided at the bottom of the second measuring claw (4), the positioning guide block (7) is at least partially located in the sliding groove (43), and the second measuring claw (4) is slidably connected to the positioning guide block (7) through the sliding groove (43).

5. The crankshaft connecting plate comprehensive measuring device according to claim 4, characterized in that: An accommodating cavity (44) is further provided in the second measuring claw (4), and two ends of the accommodating cavity (44) are respectively communicated with the second positioning groove (41) and the sliding groove (43).

6. The crankshaft connecting plate comprehensive measuring device according to claim 5, characterized in that: The displacement sensor (5) is at least partially located in the accommodating cavity (44), and a gap is left between the displacement sensor (5) and a side wall of the accommodating cavity (44).

7. The crankshaft connecting plate comprehensive measuring device according to claim 2, characterized in that: The second measuring claw (4) is further provided with a second screw (9), the second screw (9) passes through the mounting slot (42) and is connected to the fixing plate (2), and the compression spring (6) is sleeved on the outside of the second screw (9).

8. The crankshaft connecting plate comprehensive measuring device according to claim 1, characterized in that: The first measuring claw (3) is fixed to the fixing plate (2) by a first screw (8).

9. The crankshaft connecting plate comprehensive measuring device according to claim 1, characterized in that: The first positioning groove (31) comprises two symmetrically arranged first positioning support surfaces (311), and the two first positioning support surfaces (311) are distributed in a V-shape.

10. The crankshaft connecting plate comprehensive measuring device according to claim 1, characterized in that: The second positioning groove (41) comprises two symmetrically arranged second positioning support surfaces (411), and the two second positioning support surfaces (411) are distributed in a V-shape.

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