Strength testing device for a crankshaft of a piston compressor

Abstract

The application belongs to the technical field of crankshafts and provides a strength testing device for piston compressor crankshaft machining, which comprises a base and a displacement assembly, an L-shaped block is arranged on the displacement assembly, a containing groove one is arranged on the L-shaped block, a plurality of containing grooves two are arranged on the containing groove one, a rotating disc is rotatably connected in each containing groove two, a cross plate is slidably clamped on the upper end of the rotating disc through a plurality of T-shaped rods, a fixed plate is fixedly connected to the cross plate, and a bearing plate one is arranged between the plurality of fixed plates; a baffle one is arranged on the bearing plate one, a sliding groove three is arranged on the side of the bearing plate one, a sliding plate is slidably connected to the inner wall of the sliding groove three, a baffle two is arranged on the sliding plate, a rotating shaft two is rotatably connected to the baffle one and the baffle two, a telescopic rod is arranged between the two rotating shafts two, an angle adjusting assembly is arranged between the rotating shaft two and the fixed plate, and the baffle two is connected with a micrometer through a rotating shaft three and the bearing plate two. The application has the advantages of flexible angle adjustment and strong universality.

Description

Technical Field

[0001] This invention relates to the field of crankshaft technology, and more particularly to a strength testing device for machining crankshafts of piston compressors. Background Technology

[0002] As a core transmission component in engines, compressors, and other equipment, the crankshaft mainly consists of the main journal, connecting rod journal, and crank arm. Its function is to convert the force transmitted from the piston and connecting rod into torque, driving the equipment to operate continuously. Because the crankshaft must withstand periodic impact loads and torsional forces during operation, the transition positions between the crank arm, the crank-connecting rod journal, and the crank arm and main journal are stress concentration areas, making them highly susceptible to deformation or fracture. Therefore, strength testing at these locations is a crucial aspect of crankshaft quality control.

[0003] Chinese Patent (Publication No.: CN219319937U) discloses a crankshaft strength testing device, including a base. A motor is mounted on one outer wall of the base. One end of the output shaft of the motor is connected to a bidirectional threaded rod via a coupling. Both outer walls of the bidirectional threaded rod are connected to vertical plates via threads. A sliding groove is formed on the top outer wall of the base. The sliding groove is slidably connected to the vertical plate. An annular plate is slidably connected to the inner wall of the sliding groove. Gears are slidably connected to both inner walls of the annular plate. A bracket is fixed to the top outer wall of the annular plate. A motor is mounted on one outer wall of the bracket. One end of the output shaft of the motor is connected to a rotating roller via a coupling. Gears are fixed to both outer walls of the rotating roller.

[0004] Although the dial indicator's axial translation and circumferential rotation are achieved through multi-mechanism coordination, covering all positions of the crankshaft's radial inspection, key technical limitations remain: the dial indicator probe can only inspect in the radial direction perpendicular to the shaft centerline and cannot be flexibly adjusted according to the angle of the inspection surface. The crankshaft's crank body, the transition fillet between the crankshaft and connecting rod journals, and the transition area between the crankshaft and main journal are core areas of stress concentration during operation. The inspection surfaces in these areas are mostly inclined or curved. Because the dial indicator's inspection angle is fixed, the probe cannot achieve complete contact with non-radial inspection surfaces, easily creating inspection blind spots. This results in the inability to accurately collect strength data in these key stress concentration areas, ultimately causing the inspection results to only reflect the performance of the crankshaft's conventional radial area and failing to comprehensively and accurately reflect the crankshaft's actual working strength.

[0005] Therefore, in view of the above situation, there is an urgent need to develop a strength testing device for the machining of crankshafts of piston compressors to overcome the shortcomings in current practical applications. Summary of the Invention

[0006] The purpose of this invention is to provide a strength testing device for crankshaft machining of piston compressors, aiming to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A strength testing device for machining crankshafts of piston compressors includes a base, on which a clamping drive mechanism and a displacement assembly are mounted. An L-shaped block is fitted onto the displacement assembly. The L-shaped block has a receiving groove 1. Multiple receiving grooves 2 are formed at the top of the receiving groove 1. A turntable is rotatably connected to each receiving groove 2. Multiple T-shaped rods are fixedly connected to the upper end of the turntable. A cross plate is slidably connected between the multiple T-shaped rods. A fixing plate is fixedly connected to the cross plate. A T-shaped groove is formed at the lower end of the fixing plate. A receiving groove 3 is formed on the upper surface of each of the multiple fixing plates. A plate is rotatably connected to the inner wall of each receiving groove 3. A bearing plate 1 is fixedly connected between the multiple plates. A baffle is fixedly connected to the support plate. A sliding groove is provided on one side wall of the support plate. A sliding plate is slidably connected to the inner wall of the sliding groove. A baffle is fixedly connected to the sliding plate. A rotating shaft is rotatably connected to both the baffle and the baffle. A telescopic rod is fixedly connected between the two rotating shafts. An angle adjustment component is provided between the rotating shaft and the fixed plate. A rotating shaft is rotatably connected to the baffle. A support plate is fixedly sleeved on the outer wall of the rotating shaft. A dial indicator is fixedly connected to the support plate.

[0008] In a further technical solution, a fixing ring is fixedly connected to the bottom of the turntable, a drive groove is provided on the cross plate, an intermittent component is provided on the inner wall of the drive groove, and a power component is provided on both the fixing ring and the intermittent component.

[0009] A further technical solution is provided, wherein the angle adjustment component includes a second gear pair, a rotating rod, a first gear, and a second gear; a second gear is fixedly sleeved on the outer wall of one of the fixed plates, a rotating rod is rotatably connected to the first bearing plate, the lower end of the rotating rod is fixedly connected to the first gear, and the first gear meshes with the second gear, and a second gear pair is provided between the upper end of the rotating rod and the rotating shaft two near the first baffle.

[0010] In a further technical solution, the product of the transmission ratio between the second gear and the first gear, the transmission ratio of gear pair two, and the transmission ratio of gear pair three is 1.

[0011] A further technical solution includes a rotating shaft, a rotating plate, a fixed rod, and a spacing component; a groove is provided on the upper surface of the turntable, a rotating plate is provided in the groove, a rotating shaft is fixedly connected to the bottom end of the rotating plate, the lower end of the rotating shaft passes through the turntable and is rotatably connected to the bottom end of the receiving groove, a spacing component is provided on the rotating plate, a fixed rod is fixedly connected to the spacing component, and the fixed rod abuts against the inner wall of the drive groove.

[0012] A further technical solution includes a second motor, a second slide groove, a second lead screw, and a slider; the top of the rotating plate has a second slide groove, the inner wall of the second slide groove is slidably connected to a slider, a fixed rod is fixedly connected to the slider, the inner wall of the second slide groove is rotatably connected to a second lead screw, the second lead screw is threadedly connected to the slider, and one end of the second lead screw passes through the second slide groove and is fixedly connected to a second motor; a rangefinder is also provided on the inner wall of the second slide groove.

[0013] A further technical solution is provided, wherein the power assembly includes a worm, a worm wheel, and a motor; two worms are rotatably connected to the inner wall of the receiving groove, one end of each worm passes through the receiving groove and is fixedly connected to the motor, and each worm is meshed with a set of worm wheels, one set of worm wheels is fixedly sleeved on the outer wall of the corresponding fixed ring, and the other set of worm wheels is fixedly sleeved on the outer wall of the corresponding rotating shaft.

[0014] In a further technical solution, the displacement component includes a slide groove, a lead screw, and a motor; the base has a slide groove, the inner wall of the slide groove is slidably connected to an L-shaped block, the inner wall of the slide groove is rotatably connected to a lead screw, the lead screw is threadedly connected to the L-shaped block, and one end of the lead screw passes through the slide groove and is fixedly connected to a motor.

[0015] In summary, the embodiments of the present invention have the following beneficial effects compared with the prior art: 1. Two power components independently drive the intermittent component and the fixed ring. The fixed ring drives the turntable to rotate, and then the turntable drives the cross plate to rotate via the T-shaped rod. The cross plate drives the fixed plate to rotate, and the fixed plate drives the second rotating shaft to rotate via the angle adjustment component. The second rotating shaft drives the third rotating shaft to rotate via the gear pair three. Then, the third rotating shaft drives the dial indicator to rotate around the axis of the third rotating shaft via the second bearing plate. This enables flexible adjustment of the dial indicator's detection angle, ensures that the probe is in contact with the non-radial detection surface of the crankshaft, effectively eliminates the detection blind zone, and helps to collect deformation data in the key stress concentration areas of the crankshaft. 2. The dial indicator is driven to move radially by a telescopic rod to adapt to the testing needs of crankshafts with different diameters. The movement amplitude of the dial indicator is adjusted by the spacing component to avoid collision with the crankshaft. For crankshafts with small diameter differences, the testing trajectory can be reused through amplitude compensation, which greatly improves the versatility of the device. 3. The test trajectory of the same batch of crankshafts can be directly reused without repeated debugging. The intermittent component enables automatic multi-point sampling by dial indicator, which greatly improves the test efficiency. The difference analysis of "initial data before force + comparison data after force" at the same test point, combined with the statistical results of multi-point sampling, improves the reliability of the data.

[0016] To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 For the present invention Figure 1 A three-dimensional structural diagram of the middle section; Figure 3 For the present invention Figure 2 A partial sectional view of the middle section of the structure; Figure 4 For the present invention Figure 2 An explosion diagram; Figure 5 For the present invention Figure 4 Exploded view of a portion of the load-bearing plate; Figure 6 For the present invention Figure 4 A three-dimensional structural diagram of the transfer plate section; Figure 7 For the present invention Figure 6 A schematic diagram of the three-dimensional structure from another perspective; Figure 8 For the present invention Figure 6 Exploded view of the middle structure; Figure 9 This is a bottom-view perspective view of the fixing plate portion of the present invention. Figure 10 This is a three-dimensional structural diagram of the spacing component of the present invention.

[0018] In the diagram: 1. Base; 2. Clamping drive mechanism; 3. L-shaped block; 4. Displacement assembly; 41. Slide groove one; 42. Lead screw one; 43. Motor one; 5. Receiving slot one; 6. Receiving slot two; 7. Turntable; 8. T-shaped rod; 9. Cross plate; 10. Drive slot; 11. Fixing plate; 12. Intermittent assembly; 121. Rotating shaft one; 122. Rotating plate; 123. Fixing rod; 124. Spacing assembly; 1241. Motor two; 1242. Slide groove two; 1243. Lead screw two; 1244. Slider; 13. Fixed... 14. Fixed ring; 15. T-slot; 16. Receiving slot three; 17. Panel; 18. Bearing plate one; 19. Baffle one; 20. Slide three; 21. Slide plate; 22. Baffle two; 23. Rotating shaft two; 24. Telescopic rod; 25. Rotating shaft three; 26. Gear pair three; 27. Bearing plate two; 28. Dial indicator; 29. ​​Angle adjustment assembly; 281. Gear pair two; 282. Rotating rod; 283. First gear; 284. Second gear; 29. ​​Power assembly; 291. Worm gear; 292. Worm wheel; 293. Motor three. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0021] like Figures 1-10 As shown, this embodiment of the invention provides a strength testing device for machining crankshafts of piston compressors, including a base 1 and a clamping drive mechanism 2. The base 1 is provided with a clamping drive mechanism 2 for clamping and driving the crankshaft to rotate. The base 1 is also provided with a displacement component 4. An L-shaped block 3 is fitted on the displacement component 4. The L-shaped block 3 has a receiving groove 5. Multiple receiving grooves 6 are formed at the top of the receiving groove 5. A turntable 7 is rotatably connected to each receiving groove 6. Multiple symmetrically distributed T-shaped rods 8 are fixedly connected to the upper end of the turntable 7. A cross plate 9 is slidably connected between the multiple T-shaped rods 8. A fixing plate 11 is fixedly connected to the cross plate 9. A T-shaped groove 14 is slidably connected to the lower end of the fixing plate 11 and is connected to the T-shaped rods 8. A receiving groove 3 15 is formed on the upper surface of each of the multiple fixing plates 11. A plate 16 is rotatably connected to the inner wall of each receiving groove 3 15. A bearing plate 17 is fixedly connected between the multiple plates 16. A baffle 18 is fixedly connected to the support plate 17. A sliding groove 19 is provided on the side wall of the support plate 17. A sliding plate 20 is slidably connected to the inner wall of the sliding groove 19. A baffle 21 is fixedly connected to the sliding plate 20. A rotating shaft 22 is rotatably connected to both the baffle 18 and the baffle 21. A telescopic rod 23 is fixedly connected between the two rotating shafts 22. An angle adjustment component 28 is also provided between the rotating shaft 22 near the baffle 18 and the fixed plate 11. A rotating shaft 24 is rotatably connected to the baffle 21. A support plate 26 is fixedly sleeved on the outer wall of the rotating shaft 24. A dial indicator 27 is fixedly connected to the support plate 26.

[0022] It is understood that the clamping drive mechanism 2 is existing technology. The clamping drive mechanism 2 includes a motor, a pressure sensor and multiple electric telescopic rods. The clamping drive mechanism 2 can apply a preset force to the two ends of the crankshaft and drive the crankshaft to rotate at a constant speed around its own axis, so as to achieve full circumferential detection coverage of the crankshaft.

[0023] Furthermore, a fixing ring 13 is fixedly connected to the bottom of the turntable 7, and a drive groove 10 is provided on the cross plate 9. An intermittent component 12 is provided on the inner wall of the drive groove 10. The cross plate 9 is driven to slide back and forth by the intermittent component 12 and the drive groove 10 working together. A power component 29 is provided on both the fixing ring 13 and the intermittent component 12.

[0024] In practical applications, the crankshaft is clamped by the clamping drive mechanism 2 and controlled to rotate at a constant speed. The L-shaped block 3 is moved along the axis of the crankshaft (main journal axis) by the displacement component 4, thereby adjusting the detection axial position of the dial indicator 27. The intermittent component 12 and the fixed ring 13 are driven independently by two power components 29. The fixed ring 13 drives the turntable 7 to rotate. Then, the turntable 7 drives the cross plate 9 to rotate through the T-shaped rod 8. The cross plate 9 drives the fixed plate 11 to rotate. The fixed plate 11 drives the rotating shaft 22 to rotate through the angle adjustment component 28. The rotating shaft 22 drives the rotating shaft 24 to rotate through the gear pair 3 25. Then, the rotating shaft 24 drives the dial indicator 27 to rotate around the axis of the rotating shaft 24 through the bearing plate 26. Whether the detection angle of the dial indicator 27 can be flexibly adjusted, ensuring that the probe is in contact with the non-radial detection surface of the crankshaft, effectively eliminating the detection blind zone, and helping to collect deformation data of the key stress concentration area of ​​the crankshaft; When adjusting the detection distance of the dial indicator 27 for crankshafts of different diameters or along the radial direction of the crankshaft, the telescopic rod 23 needs to be extended or retracted. The telescopic rod 23 can be an electric telescopic rod, a cylinder or other linear drive element, which drives the baffle 21 to move. The baffle 21 drives the dial indicator 27 to move through the bearing plate 26, thereby adjusting the radial distance between the dial indicator 27 and the detection surface, ensuring that the probe of the dial indicator 27 can contact the detection surface during the detection process. During this process, the slide plate 20 slides relative to the inner wall of the slide groove 3 19. The intermittent component 12 and the drive groove 10 work together to drive the cross plate 9 to reciprocate. The cross plate 9 drives the fixed plate 11 to reciprocate. The fixed plate 11 drives the bearing plate 17 to reciprocate through the receiving groove 15 and the insert plate 16. This drives the dial indicator 27 to reciprocate, thereby realizing the intermittent contact and movement of the dial indicator 27 with and away from the crankshaft surface. Multiple points are sampled and tested on the crankshaft surface. Based on the difference in measurement data before and after the same position where the clamping drive mechanism 2 applies force to the crankshaft, the degree of crankshaft deformation is calculated, and its strength performance is determined. Multi-point sampling and testing improves the accuracy of the test results and increases work efficiency.

[0025] like Figures 2-4 As shown, the angle adjustment assembly 28 includes a second gear pair 281, a rotating rod 282, a first gear 283, and a second gear 284; the second gear 284 is fixedly sleeved on the outer wall of a fixing plate 11, the rotating rod 282 is rotatably connected to a bearing plate 17, the lower end of the rotating rod 282 is fixedly connected to the first gear 283, and the first gear 283 and the second gear 284 are meshed together, and the second gear pair 281 is provided between the upper end of the rotating rod 282 and the rotating shaft 22 near the baffle 18.

[0026] Furthermore, the product of the transmission ratio between the second gear 284 and the first gear 283, the transmission ratio of gear pair 281, and the transmission ratio of gear pair 25 is 1. This makes the rotation angle of the second gear 284 the same as the rotation angle of the shaft 24. In other words, the rotation angle of the dial indicator 27 around the axis of the shaft 24 is equal to the rotation angle of the fixed plate 11. That is, the rotation angle of the dial indicator 27 around the axis of the shaft 24 is equal to the rotation angle of the cross plate 9. This ensures the precise synchronization of the dial indicator 27 angle adjustment.

[0027] In practical application, one of the power components 29 drives the fixed ring 13 to rotate, then the fixed ring 13 drives the turntable 7 to rotate, then the turntable 7 drives the T-shaped rod 8 to rotate, then multiple T-shaped rods 8 clamp the cross plate 9 to rotate, the cross plate 9 drives the fixed plate 11 to rotate, then the fixed plate 11 drives the second gear 284 to rotate, the second gear 284 drives the first gear 283 to rotate, then the first gear 283 drives the rotating rod 282 to rotate, then the rotating rod 282 drives the rotating shaft 22 near the baffle 18 to rotate through the gear pair 281, then the rotating shaft 22 near the baffle 21 drives the rotating shaft 22 to rotate through the telescopic rod 23, then drives the rotating shaft 24 near the baffle 21 to rotate through the gear pair 3 25, the rotating shaft 24 drives the bearing plate 26 to rotate, then the bearing plate 26 drives the dial indicator 27 to rotate around the axis of the rotating shaft 24.

[0028] like Figure 3 , Figure 6 and Figure 8 As shown, the intermittent component 12 includes a rotating shaft 121, a rotating plate 122, a fixing rod 123, and a spacing component 124. A groove is provided on the upper surface of the turntable 7, and the rotating plate 122 is provided in the groove. The rotating shaft 121 is fixedly connected to the bottom end of the rotating plate 122. The lower end of the rotating shaft 121 passes through the turntable 7 and is rotatably connected to the bottom end of the receiving groove 5. The spacing component 124 is provided on the rotating plate 122, and the fixing rod 123 is fixedly connected to the spacing component 124. The fixing rod 123 abuts against the inner wall of the drive groove 10.

[0029] In practical applications, the power component 29 corresponding to the intermittent component 12 drives the rotating shaft 121 to rotate. Then, the rotating shaft 121 drives the rotating plate 122 to rotate around the axis of the rotating shaft 121. Next, the rotating plate 122 drives the fixed rod 123 to rotate around the axis of the rotating shaft 121. After that, the fixed rod 123 pushes the cross plate 9 to move back and forth in a direction perpendicular to the driving groove 10 through the driving groove 10. The cross plate 9 drives the fixed plate 11 to move back and forth. The fixed plate 11 drives the bearing plate 17 to move back and forth through the cooperation of the receiving groove 15 and the insert plate 16, thereby driving the dial indicator 27 to move back and forth, thereby controlling the dial indicator 27 to intermittently contact the surface to be tested, so as to collect the shape data of the monitoring point.

[0030] like Figure 8 and Figure 10As shown, the spacing component 124 includes a second motor 1241, a second slide groove 1242, a second lead screw 1243, and a slider 1244. The top of the rotating plate 122 has a second slide groove 1242. The slider 1244 is slidably connected to the inner wall of the second slide groove 1242. A fixed rod 123 is fixedly connected to the slider 1244. The second lead screw 1243 is rotatably connected to the inner wall of the second slide groove 1242. The second lead screw 1243 is threadedly connected to the slider 1244. One end of the second lead screw 1243 passes through the second slide groove 1242 and is fixedly connected to the second motor 1241. A rangefinder (not shown in the figure) is also provided on the inner wall of the second slide groove 1242.

[0031] In practical applications, the position of slider 1244 within slide groove 1242 is measured using a rangefinder to achieve precise control of the movement amplitude. When it is necessary to adjust the movement amplitude of dial indicator 27 relative to the surface to be inspected, the drive shaft of motor 1241 is controlled to rotate. Then, the drive shaft of motor 1241 drives lead screw 1243 to rotate. Subsequently, lead screw 1243 drives slider 1244 to slide along the inner wall of slide groove 1242. Then, slider 1244 drives fixed rod 123 to move, thereby adjusting the distance between fixed rod 123 and the axis of rotation of shaft 121, thus changing the rotation radius of fixed rod 123. This, in turn, adjusts the reciprocating movement amplitude of cross plate 9 driven by fixed rod 123, thereby adjusting the movement amplitude of dial indicator 27 relative to the surface to be inspected. This allows for flexible adjustment based on the structural dimensions of different crankshafts (such as the distance between two adjacent cranks), effectively avoiding collision interference between dial indicator 27 and crankshaft. When the detection angle of dial indicator 27 needs to be adjusted, the drive end of motor 2 1241 is rotated. Then, the drive end of motor 2 1241 drives lead screw 2 1243 to rotate. After that, lead screw 2 1243 drives slider 1244 to slide along the inner wall of slide groove 2 1242 until the fixed rod 123 is collinear with the axis of rotation shaft 121. At this time, the axes of turntable 7, fixed plate 11, rotation shaft 121 and fixed rod 123 are collinear, thus avoiding interference of fixed rod 123 with the rotation of cross plate 9. The fixed ring 13 is driven to rotate by the corresponding power component 29. Then, the fixed ring 13 drives the turntable 7 to rotate. The turntable 7 drives the cross plate 9 to rotate through multiple T-shaped rods 8, thereby adjusting the angle of the cross plate 9. The cross plate 9 drives the fixed plate 11 to rotate. The fixed plate 11 drives the dial indicator 27 to rotate synchronously through the angle adjustment component 28, the second rotating shaft 22, the telescopic rod 23, the third rotating shaft 24, the third gear pair 25, and the second bearing plate 26. The rotation angle of the dial indicator 27 is the same as the rotation angle of the fixed plate 11. During this process, since the receiving groove 15 and the insert 16 are located at the axial position of the fixed plate 11, the rotation of the fixed plate 11 does not affect the position of the receiving groove 15 and the insert 16, thus keeping the spatial position of the bearing plate 17 unchanged.

[0032] like Figure 2 , Figure 6 , Figure 7 and Figure 8 As shown, the power assembly 29 includes a worm gear 291, a worm wheel 292, and a motor 293. Two worm gears 291 are rotatably connected to the inner wall of the receiving groove 5. One end of each worm gear 291 passes through the receiving groove 5 and is fixedly connected to the motor 293. Each worm gear 291 is meshed with a set of worm wheels 292. One set of worm wheels 292 is fixedly sleeved on the outer wall of the corresponding fixed ring 13, and the other set of worm wheels 292 is fixedly sleeved on the outer wall of the corresponding rotating shaft 121.

[0033] In practical applications, the power assembly 29 adopts a worm gear transmission structure with a self-locking function, which can ensure that the fixed ring 13 or the rotating shaft 121 maintains its current stable position after stopping rotation, avoiding deviation of the detection angle or movement range due to external interference. When the fixed ring 13 or the rotating shaft 121 needs to rotate, the corresponding motor 293 is started. Then, the drive end of the motor 293 drives the worm 291 to rotate, then the worm 291 drives the worm wheel 292 to rotate, and then the worm wheel 292 drives the fixed ring 13 or the rotating shaft 121 to rotate, realizing the synchronous rotation of multiple fixed rings 13 or rotating shafts 121.

[0034] like Figure 1 As shown, the displacement assembly 4 includes a slide groove 41, a lead screw 42, and a motor 43; the base 1 has a slide groove 41, the inner wall of the slide groove 41 is slidably connected to the L-shaped block 3, the inner wall of the slide groove 41 is rotatably connected to the lead screw 42, the lead screw 42 is threadedly connected to the L-shaped block 3, and one end of the lead screw 42 passes through the slide groove 41 and is fixedly connected to the motor 43.

[0035] In a specific application, the drive end of the control motor 43 rotates, and then the drive end of the motor 43 drives the lead screw 42 to rotate. Then the lead screw 42 drives the L-shaped block 3 to slide along the inner wall of the slide groove 41, thereby driving the dial indicator 27 to move along the direction of the slide groove 41, that is, driving the dial indicator 27 to move along the axis of the crankshaft journal.

[0036] The working principle of this invention is as follows: First, the L-shaped block 3 is controlled to be located at one end of the slide groove 41 by the displacement component 4. Then, the crankshaft is fixedly clamped by the clamping drive mechanism 2, and the telescopic rod 23 is controlled to extend and retract, thereby driving the baffle 21 to move. The baffle 21 drives the dial indicator 27 to move through the bearing plate 26, thereby adjusting the radial distance between the dial indicator 27 and the main journal detection surface, thereby ensuring that the distance between the dial indicator 27 and the main journal detection surface is less than the movement range of the dial indicator 27 driven by the intermittent component 12, thereby ensuring that the dial indicator 27 can contact the detection surface during the detection process. When the displacement component 4 drives the L-shaped block 3 to the transition fillet of the crank, the transition area between the crank and the connecting rod journal, and the transition area between the crank and the main journal, the angle of the dial indicator 27 needs to be adjusted. The fixed ring 13 is driven to rotate by the corresponding power component 29. The fixed ring 13 drives the turntable 7 to rotate, and then the turntable 7 drives the T-shaped rod 8 to rotate. Then, multiple T-shaped rods 8 clamp the cross plate 9 to rotate. The cross plate 9 drives the fixed plate 11 to rotate. The fixed plate 11 drives the rotating shaft 22 to rotate through the angle adjustment component 28. The rotating shaft 22 rotates through the gear pair. The third 25 drives the rotating shaft 24 to rotate, and then the rotating shaft 24 drives the dial indicator 27 to rotate around the axis of the rotating shaft 24 through the bearing plate 26. This allows the angle of the dial indicator 27 to be flexibly adjusted according to the detection surface. In the above process, since the axis of the connecting rod journal and the main journal are not collinear, there may be a situation where the distance between the dial indicator 27 and the detection surface is greater than or less than the range of movement of the dial indicator 27 driven by the intermittent component 12. It is necessary to adjust the radial distance between the dial indicator 27 and the connecting rod journal by means of the telescopic rod 23. When the displacement component 4 drives the L-shaped block 3 to the connecting rod journal area, adjust the radial distance between the dial indicator 27 and the connecting rod journal detection surface to ensure that the distance between the dial indicator 27 and the connecting rod journal detection surface is less than the movement range of the dial indicator 27 driven by the intermittent component 12. The motion trajectory of the dial indicator 27 and the motion trajectory of the clamping drive mechanism 2 are saved (including data such as the power component 29 corresponding to the fixed ring 13, the displacement component 4, and the motor inside the clamping drive mechanism 2). Then, the dial indicator 27 is controlled to move according to the saved trajectory. During this process, its movement is simultaneously controlled by the power component 29 corresponding to the intermittent component 12. Then, the cross plate 9 is driven to move back and forth by the intermittent component 12 and the drive groove 10. The cross plate 9 drives the fixed plate 11 to move back and forth. The fixed plate 11 drives the bearing plate 17 to move back and forth by the receiving groove 15 and the insert plate 16. This drives the dial indicator 27 to move back and forth. That is, the dial indicator 27 continuously moves against and away from the crankshaft surface, thereby collecting data from multiple points on the multi-crankshaft surface as initial data. Then, the clamping drive mechanism 2 applies force to the crankshaft end, and the same points on the multi-crankshaft surface are collected again according to the above scheme as comparison data. The strength is detected based on the difference between the measurement data before and after at the same position.

[0037] In addition, for crankshafts of the same batch and diameter, the motion trajectory of the dial indicator 27 and the clamping drive mechanism 2 can be reused. For crankshafts with small diameter differences, the motion trajectory of the dial indicator 27 and the rotation trajectory of the clamping drive mechanism 2 can also be used, and then the movement amplitude of the dial indicator 27 can be adjusted by the pitch component 124 for compensation.

[0038] The circuits, electronic components, and modules involved are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this invention does not involve any improvement to the software and methods.

[0039] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A strength testing device for a piston compressor crankshaft, comprising a base (1), wherein a clamping drive mechanism (2) and a displacement assembly (4) are disposed on the base (1), and an L-shaped block (3) is disposed on the displacement assembly (4), characterized in that, The L-shaped block (3) has a receiving groove 1 (5) and a plurality of receiving grooves 2 (6) at the top of the receiving groove 1 (5). Each receiving groove 2 (6) is rotatably connected to a turntable (7). The upper end of the turntable (7) is fixedly connected to a plurality of T-shaped rods (8). A cross plate (9) is slidably connected between the plurality of T-shaped rods (8). A fixing plate (11) is fixedly connected to the cross plate (9). A T-shaped groove (14) is opened at the lower end of the fixing plate (11). Each of the upper surfaces of the plurality of fixing plates (11) has a receiving groove 3 (15). Each receiving groove 3 (15) is rotatably connected to a panel (16) on the inner wall of the receiving groove 3 (15). A bearing plate 1 (17) is fixedly connected between the plurality of panels (16). A baffle plate (18) is fixedly connected to the first bearing plate (17). A sliding groove (19) is provided on the side wall of the first bearing plate (17). A sliding plate (20) is slidably connected to the inner wall of the sliding groove (19). A baffle plate (21) is fixedly connected to the sliding plate (20). A rotating shaft (22) is rotatably connected to both the first baffle (18) and the second baffle (21). A telescopic rod (23) is fixedly connected between the two rotating shafts (22). An angle adjustment component (28) is provided between the rotating shaft (22) and the fixed plate (11). A rotating shaft (24) is rotatably connected to the second baffle (21). A bearing plate (26) is fixedly sleeved on the outer wall of the rotating shaft (24). A dial indicator (27) is fixedly connected to the second bearing plate (26). The bottom of the turntable (7) is fixedly connected to a fixing ring (13), and a drive groove (10) is opened on the cross plate (9). An intermittent component (12) is provided on the inner wall of the drive groove (10). A power component (29) is provided on both the fixing ring (13) and the intermittent component (12).

2. The strength testing device for the crankshaft of a piston compressor according to claim 1, characterized in that, The angle adjustment assembly (28) includes a gear pair (281), a rotating rod (282), a first gear (283), and a second gear (284); A second gear (284) is fixedly sleeved on the outer wall of one of the fixed plates (11). A rotating rod (282) is rotatably connected on the first bearing plate (17). A first gear (283) is fixedly connected to the lower end of the rotating rod (282), and the first gear (283) meshes with the second gear (284). A gear pair (281) is provided between the upper end of the rotating rod (282) and the rotating shaft (22) near the first baffle (18).

3. The strength testing device for the crankshaft of a piston compressor according to claim 2, characterized in that, The product of the transmission ratio between the second gear (284) and the first gear (283), the transmission ratio of gear pair two (281), and the transmission ratio of gear pair three (25) is 1.

4. The strength testing device for the crankshaft of a piston compressor according to claim 1, characterized in that, The intermittent component (12) includes a rotating shaft (121), a rotating plate (122), a fixing rod (123), and a spacing component (124). The upper surface of the turntable (7) is provided with a groove, and a rotating plate (122) is provided in the groove. A rotating shaft (121) is fixedly connected to the bottom end of the rotating plate (122). The lower end of the rotating shaft (121) passes through the turntable (7) and is rotatably connected to the bottom end of the receiving groove (5). A spacing component (124) is provided on the rotating plate (122). A fixing rod (123) is fixedly connected to the spacing component (124), and the fixing rod (123) abuts against the inner wall of the drive groove (10).

5. The strength testing device for a piston compressor crankshaft according to claim 4, characterized in that, The spacing assembly (124) includes a second motor (1241), a second slide groove (1242), a second lead screw (1243), and a slider (1244). The top of the rotating plate (122) is provided with a sliding groove (1242). A slider (1244) is slidably connected to the inner wall of the sliding groove (1242). A fixed rod (123) is fixedly connected to the slider (1244). A lead screw (1243) is rotatably connected to the inner wall of the sliding groove (1242). The lead screw (1243) is threadedly connected to the slider (1244). One end of the lead screw (1243) passes through the sliding groove (1242) and is fixedly connected to a motor (1241). A rangefinder is also provided on the inner wall of the sliding groove (1242).

6. The strength testing device for a piston compressor crankshaft according to claim 1, characterized in that, The power assembly (29) includes a worm (291), a worm wheel (292), and a motor (293). Two worm gears (291) are rotatably connected to the inner wall of the receiving groove (5). One end of each worm gear (291) passes through the receiving groove (5) and is fixedly connected to a motor (293). Each worm gear (291) is meshed with a set of worm wheels (292). One set of worm wheels (292) is fixedly sleeved on the outer wall of the corresponding fixed ring (13), and the other set of worm wheels (292) is fixedly sleeved on the outer wall of the corresponding rotating shaft (121).

7. The strength testing device for a piston compressor crankshaft according to claim 1, characterized in that, The displacement assembly (4) includes a slide rail (41), a lead screw (42), and a motor (43). The base (1) has a sliding groove (41) with the inner wall of the sliding groove (41) slidably connected to the L-shaped block (3). The inner wall of the sliding groove (41) is rotatably connected to a screw rod (42). The screw rod (42) is threadedly connected to the L-shaped block (3), and one end of the screw rod (42) passes through the sliding groove (41) and is fixedly connected to a motor (43).

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