Crankshaft blank bending amount detection device
By integrating a device for bending detection and cold straightening, the problem of repeated turnover during the inspection and straightening process of crankshaft blanks has been solved, improving efficiency and reducing costs, and realizing an efficient inspection and straightening process.
Patent Information
- Application Number
- CN202423101581.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-16
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-16
AI Technical Summary
The existing process for detecting and straightening the bending of crankshaft blanks requires repeated turnover, resulting in low efficiency and increased production costs. The hoisting equipment is also time-consuming and labor-intensive.
A device integrating bending detection and cold straightening functions was designed, including a guide support plate, a clamping mechanism, and a measuring support mechanism. The bending amount is detected by a dial indicator, and cold straightening is performed directly with the help of the clamping mechanism, reducing the number of times the crankshaft blank is turned over.
It improves the efficiency of crankshaft blank inspection and straightening, reduces repeated turnover processes, saves production costs, and avoids damage to crankshaft blanks.
Smart Images
Figure CN223531121U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of crankshaft testing technology, specifically to a crankshaft blank bending amount testing device. Background Technology
[0002] After undergoing quenching and tempering or normalizing heat treatment, engine crankshaft blanks often exhibit significant bending deformation, especially large and medium-sized crankshaft blanks, where the bending deformation is usually even greater. Straightening is necessary to ensure the crankshaft blank meets quality standards. The straightening method for the crankshaft blank is selected based on the required bending amount. When the bending amount exceeds the bending limit, hot straightening is required; conversely, cold straightening is sufficient. The bending amount of the crankshaft blank is typically set according to different customer requirements.
[0003] Currently, when straightening crankshaft blanks, it is necessary to first use testing equipment to detect the amount of bending. Based on the detected bending amount, it is determined whether cold or hot straightening is required. However, existing measuring devices can only detect the amount of bending. When cold straightening is required, the crankshaft blank must be transferred to the straightening station for straightening. After straightening, the crankshaft blank is then transferred to testing equipment for inspection, and this cycle of straightening, inspection, and testing is repeated until the workpiece is qualified. The intermediate transfer process usually requires lifting equipment for transportation, which is time-consuming and labor-intensive. Furthermore, the repeated transfer of workpieces significantly reduces work efficiency and increases production costs. Utility Model Content
[0004] To address the problems in the background technology and improve the efficiency of crankshaft blank straightening inspection, this utility model provides a detection device capable of detecting the bending amount of crankshaft blanks and performing cold straightening operations. This avoids repeated straightening processes, reduces the number of times the crankshaft blank is handled, and improves work efficiency. The technical solution is as follows:
[0005] A crankshaft blank bending detection device includes a base plate. Two guide support plates, a measuring support mechanism, and two clamping mechanisms for fixing the crankshaft blank are slidably mounted on the top of the base plate. The guide support plates and clamping mechanisms slide left and right, while the measuring support mechanism slides back and forth. The top of the guide support plate is an inclined surface, lower at the front and higher at the back. A U-shaped groove for placing the crankshaft blank is provided at the front end of the top of the guide support plate. The two guide support plates are symmetrically arranged. The two clamping mechanisms are located on opposite sides of the two guide support plates. The measuring support mechanism is located at the front end of the base plate and between the two guide support plates. The measuring support mechanism includes a sliding plate, a dial indicator, and a support block. The sliding plate is slidably connected to the base plate. A limit rod is fixed to the top of the sliding plate and slides through the support block. The dial indicator is mounted on the front end of the support block, with its probe extending above the top surface of the support block. A shim for adjusting the height of the support block is detachably placed between the support block and the sliding plate.
[0006] Preferably, a limiting plate is fixed to the top of the limiting rod, and a spring is sleeved on the outer wall of the limiting rod. The spring is located between the limiting plate and the support block, with one end of the spring fixedly connected to the limiting plate and the other end of the spring fixedly connected to the top of the support block.
[0007] Preferably, there are four limiting rods, which are located at the four corners of the slide plate. Connecting plates are provided on both sides of the bottom of the support block. The connecting plates are provided with limiting holes corresponding to the number and position of the limiting rods. The limiting rods pass through the limiting holes and are slidably connected to the connecting plates.
[0008] Preferably, the top of the base plate near the rear side is provided with a first sliding groove in the left-right direction, the bottom of the guide support plate is fixed with a first slider, a first screw is rotatably provided in the first sliding groove, the first slider is provided with a first screw hole, the first slider is slidably disposed in the first sliding groove, and the first slider is threadedly connected to the first screw through the first screw hole, and a first motor is fixed on one side of the base plate, and the output end of the first motor is connected to the first screw.
[0009] The threads at both ends of the first screw are in opposite directions, and the first sliders of the two guide support plates are respectively threaded to both ends of the first screw.
[0010] Preferably, the top of the base plate is provided with a second sliding groove along the front-rear direction near the front side, the bottom of the sliding plate is fixed with a second slider, a second screw is rotatably provided in the second sliding groove, the second slider is provided with a second screw hole, the second slider is slidably disposed in the second sliding groove, and the second slider is threadedly connected to the second screw through the second screw hole, and a second motor is fixed on one side of the base plate, the output end of the second motor is connected to the second screw.
[0011] Preferably, there are two parallel sliding grooves. One second sliding groove contains the second screw, and the other second sliding groove contains a sliding rod. There are two second sliders, which are slidably disposed in the two second sliding grooves respectively. One second slider has the second screw hole, and the other second slider has a sliding hole. The second slider with the sliding hole is slidably connected to the sliding rod through the sliding hole.
[0012] Preferably, the support block has a receiving compartment at its front end, the receiving compartment extends through the front side of the support block, the dial indicator is fixed in the receiving compartment, the top of the front end of the support block has a detection hole, the detection hole communicates with the receiving compartment, and the probe of the dial indicator extends through the detection hole to the top surface of the support block.
[0013] Preferably, the clamping mechanism includes a vertical plate and an electric push rod. The top of the vertical plate is provided with a V-shaped groove for placing the end of the crankshaft blank. The V-shaped groove corresponds to the U-shaped groove. The electric push rod is fixed above the V-shaped groove by a mounting bracket. A top block is fixed to the telescopic end of the electric push rod. The top block moves closer to or away from the V-shaped groove by the drive of the electric push rod.
[0014] Preferably, a third sliding groove is provided at the top of the bottom near the front side along the left and right direction, and a third slider is fixed at the bottom of the upright plate, and the third slider is slidably disposed in the third sliding groove.
[0015] Preferably, each of the two guide support plates is provided with a placement platform at the rear of its top end. The placement platform is inclined in the same direction as the top of the guide support plate, and baffles are provided at the rear end and opposite sides of the two placement platforms.
[0016] The beneficial effects of this utility model are as follows:
[0017] This invention uses a dial indicator to detect whether the crankshaft blank exceeds the bending limit. If the bending of the crankshaft blank is small and does not exceed the bending limit, and the crankshaft blank needs to be cold straightened, the two ends of the crankshaft blank are clamped by a clamping mechanism to prevent rotation. At this time, a hydraulic press or other calibration equipment can be used to press and straighten the crankshaft blank, eliminating the need for repeated handling. Simultaneously, the pressing amount can be controlled by adjusting the distance between the support block and the crankshaft blank, ensuring successful straightening with as few straightening attempts as possible and avoiding excessive pressing that could damage the crankshaft blank. This invention solves the problem that existing crankshaft blank bending detection and cold straightening require separate processes, leading to repeated workpiece straightening and handling, greatly improving work efficiency and saving production costs. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0019] Figure 2 This is a top view of the base plate structure of this utility model;
[0020] Figure 3 This is a schematic diagram of the measuring support mechanism of this utility model;
[0021] Figure 4 This is a schematic diagram of the guide support plate structure of this utility model;
[0022] Figure 5 This is a schematic diagram of the clamping mechanism of this utility model;
[0023] Figure 6 This is a schematic diagram of the structure of the present invention when a crankshaft blank is placed there.
[0024] Labels in the diagram: 1. Base plate; 2. Guide support plate; 3. U-shaped groove; 4. Placement platform; 5. First slide groove; 6. First slider; 7. First motor; 8. Slide plate; 9. Shim; 10. Spring; 11. Dial indicator; 12. Storage compartment; 13. Support block; 14. Limiting rod; 15. Second slide groove; 16. Second slider; 17. Second motor; 18. Vertical plate; 19. Electric push rod; 20. Mounting bracket; 21. V-shaped groove; 22. Top block; 23. Third slide groove; 24. Third slider; 25. First screw; 26. Second screw; 27. Slide rod; 28. Standard crankshaft blank. Detailed Implementation
[0025] To make this utility model clearer and more understandable, the technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the given embodiments are only one of the implementation methods and do not represent all embodiments.
[0026] In this article, terms such as "inner," "outer," "upper," "lower," "front," "back," "left," and "right" are established based on the positional relationships shown in the attached figures. Depending on the attached figures, the corresponding positional relationships may also change. Therefore, they should not be interpreted as an absolute limitation on the scope of protection.
[0027] Combined with appendix Figure 1 - Appendix Figure 6 A crankshaft blank bending detection device includes a base plate 1. Two guide support plates 2, a measuring support mechanism, and two clamping mechanisms for fixing the crankshaft blank are slidably mounted on the top of the base plate 1. The guide support plates 2 and clamping mechanisms slide left and right, while the measuring support mechanism slides back and forth. The top of the guide support plates 2 is an inclined surface, lower at the front and higher at the back. When placing the crankshaft blank, the blank can slide along the top of the guide support plates 2 under its own weight, easily moving into a U-shaped groove 3 without requiring excessive manual movement. The front end of the top of the guide support plates 2 has a U-shaped groove 3 for placing the crankshaft blank. The two guide support plates 2 are symmetrically arranged, and the two clamping mechanisms are respectively located on the two guide support plates 2. On the opposite side of the support plate 2, the measuring support mechanism is located at the front end of the base plate 1 and between the two guide support plates 2. The measuring support mechanism includes a slide plate 8, a dial indicator 11, and a support block 13. The slide plate 8 is slidably connected to the base plate 1. A limit rod 14 is fixed at the top of the slide plate 8. The limit rod 14 slides through the support block 13. The dial indicator 11 is installed at the front end of the support block 13. The probe of the dial indicator 11 extends to the top surface of the support block 13. A shim 9 for adjusting the height of the support block 13 is detachably placed between the support block 13 and the slide plate 8. When the height needs to be adjusted, a certain thickness and number of shims 9 are inserted between the support block 13 and the slide plate 8 as needed, and the support block 13 is lifted by the shims 9.
[0028] Specifically, a limiting plate is fixed to the top of the limiting rod 14, and a spring 10 is sleeved on the outer wall of the limiting rod 14. The spring 10 is located between the limiting plate and the support block 13. One end of the spring 10 is fixedly connected to the limiting plate, and the other end of the spring 10 is fixedly connected to the top of the support block 13. When the bottom surface of the support block 13 contacts the top surface of the slide plate 8, the spring 10 is in a compressed state, and the spring force of the spring 10 fixes the support block 13 relative to the slide plate 8. When a shim 9 is inserted between the slide plate 8 and the support block 13, the support block 13 is lifted, the spring 10 is compressed, and the spring 10 applies pressure to the support block 13 through its own elasticity. The support block 13 squeezes the shim 9, and the support block 13, the shim 9, and the slide plate 8 are relatively fixed.
[0029] More specifically, there are four limiting rods 14, which are located at the four corners of the slide plate 8. Connecting plates are provided on both sides of the bottom of the support block 13. The connecting plates have limiting holes corresponding to the number and position of the limiting rods 14. The limiting rods 14 pass through the limiting holes and are slidably connected to the connecting plates. The four limiting rods 14 ensure the smooth sliding of the support block 13.
[0030] Specifically, the base plate 1 has a first sliding groove 5 near the rear side on the top, and a first slider 6 is fixed at the bottom of the guide support plate 2. A first screw 25 is rotatably provided in the first sliding groove 5. The first slider 6 has a first screw hole. The first slider 6 is slidably disposed in the first sliding groove 5, and the first slider 6 is threadedly connected to the first screw 25 through the first screw hole. A first motor 7 is fixed on one side of the base plate 1, and the output end of the first motor 7 is connected to the first screw 25.
[0031] The threads at both ends of the first screw 25 are in opposite directions, and the first sliders 6 of the two guide support plates 2 are respectively threaded to the two ends of the first screw 25. By rotating the first motor 7 forward or backward, the first screw 25 is driven to rotate. The first screw 25 drives the two guide support plates 2 to move closer or further apart, thereby adjusting the distance between the two guide support plates 2 and meeting the inspection requirements for crankshaft blanks of different lengths.
[0032] Specifically, the base plate 1 has a second sliding groove 15 near the front side at its top, and a second slider 16 is fixed to the bottom of the slide plate 8. A second screw 26 is rotatably mounted inside the second sliding groove 15. The second slider 16 has a second screw hole and is slidably disposed within the second sliding groove 15. The second slider 16 is threadedly connected to the second screw 26 through the second screw hole. A second motor 17 is fixed to one side of the base plate 1, and the output end of the second motor 17 is connected to the second screw 26. By rotating the second motor 17 forward or backward, the second screw 26 is driven to rotate, causing the slide plate 8 to move forward or backward.
[0033] More specifically, the second slide groove 15 has two parallel sections. One slide groove 15 houses the second screw 26, and the other slide groove 15 houses a rotatable sliding rod 27. There are two second sliders 16, each slidably disposed within one of the two slide grooves 15. One slider 16 has a second screw hole, through which it is threadedly connected to the second screw 26. The other slider 16 has a sliding hole, through which it is slidably connected to the sliding rod 27. The two slide grooves 15 and two sliders 16 improve the stability of the sliding plate 8's movement.
[0034] Specifically, the support block 13 has a receiving compartment 12 at its front end, which extends through the front side of the support block 13, forming an observation window. The dial indicator 11 is fixed in the receiving compartment 12. The top front end of the support block 13 has a detection hole that communicates with the receiving compartment 12. The probe of the dial indicator 11 extends through the detection hole to the top surface of the support block 13. The dial of the dial indicator 11 faces forward, allowing operators to observe its readings through the observation window.
[0035] More specifically, a bushing is provided in the detection hole, the bushing is coaxial with the detection hole and is interference-fitted, and the probe of the detection dial indicator 11 extends through the bushing to the top surface of the support block 13.
[0036] Specifically, the clamping mechanism includes a vertical plate 18 and an electric push rod 19. The top of the vertical plate 18 is provided with a V-groove 21 for placing the ends of the crankshaft blank. The V-groove 21 corresponds to the position of the U-groove 3. The electric push rod 19 is fixed above the V-groove 21 by a mounting bracket 20. A top block 22 is fixed to the telescopic end of the electric push rod 19. The top block 22 moves closer to or away from the V-groove 21 by the drive of the electric push rod 19. During testing, the two ends of the crankshaft blank extend out of the U-groove 3 and are placed in the V-groove 21. When it is necessary to fix the crankshaft blank, the electric push rod 19 is activated. The electric push rod 19 drives the top block 22 to press against the crankshaft blank, and the crankshaft blank is fixed by the clamping action of the V-groove 21 and the top block 22. The clamping mechanism ensures the stability of the crankshaft blank position during the straightening process, thereby ensuring the accuracy of the straightening. When the crankshaft blank changes from bent to straight, its length will increase by a certain distance. The sliding setting of the clamping mechanism can move with the change of the crankshaft blank length, avoiding breakage when the crankshaft blank is straightened under completely fixed conditions, and further ensuring the straightening effect.
[0037] Specifically, a third sliding groove 23 is provided at the top of the bottom near the front side along the left and right direction, and a third slider 24 is fixed at the bottom of the upright plate 18. The third slider 24 is slidably disposed in the third sliding groove 23.
[0038] More specifically, the third slide groove 23 is a dovetail groove, and the third slider 24 is a dovetail block. The dovetail design can prevent the upright plate 18 from detaching from the base plate 1 and improve the stability of the sliding of the upright plate 18.
[0039] Specifically, each of the two guide support plates 2 has a placement platform 4 at its rear top position. The placement platform 4 is inclined in the same direction as the top of the guide support plate 2, and baffles are provided at the rear end and opposite sides of the two placement platforms 4. The placement platform 4 and the baffles can limit the crankshaft blank placed on the placement platform 4, preventing the crankshaft blank from detaching from the guide support plate 2 when it slides along the top of the guide support plate 2 into the U-shaped groove 3, and ensuring that the crankshaft blank can slide more accurately into the U-shaped groove 3.
[0040] Workflow: First, place the standard crankshaft blank 28 into the U-shaped groove 3. Move the slide plate 8 so that the probe of the dial indicator 11 is positioned below the standard crankshaft blank 28. Adjust the height of the support block 13 by adjusting the number of shims 9, thereby adjusting the distance between the probe of the dial indicator 11 and the standard crankshaft blank 28. The inherent bending amount of the standard crankshaft blank 28 is the standard bending amount required for processing. Calibrate the dial indicator 11 using the standard crankshaft blank 28 to determine the position of the dial indicator 11. When the dial indicator 11 measures the standard crankshaft blank 28 at this position, the reading of the dial indicator 11 is the standard bending amount. Determine the bending amount limit based on the standard bending amount.
[0041] Remove the standard crankshaft blank 28 and place the crankshaft blank to be tested into the U-shaped grooves 3 of the two guide support plates 2. Rotate the crankshaft blank 360°. If the reading of the dial indicator 11 exceeds the bending limit, remove the standard crankshaft blank 28 for hot straightening. If the reading does not exceed the bending limit and does not reach the standard bending amount, adjust the height of the support block 13 according to the difference between the standard bending amount and the actual bending amount of the dial indicator 11. The distance between the support block 13 and the crankshaft blank is the required downward pressure for calibration. Then start the electric push rod 19 to move the top block 22. The crankshaft blank is clamped and fixed at the end with the V-groove 21 to prevent it from rotating. At this time, a straightening device, such as a hydraulic press, is used to press down and straighten the crankshaft blank. The support block 13 can support the crankshaft blank to avoid over-straightening and causing cracks in the crankshaft blank. After straightening, the support block 13 is adjusted back to the previous height (the height when the crankshaft blank bending amount is detected). The slide plate 8 is moved so that the dial indicator 11 is located below the crankshaft blank. The bending amount of the crankshaft blank is detected again to see if the reading of the dial indicator 11 reaches the value under the standard bending amount. If it does, it means that the straightening is completed.
[0042] Although embodiments of the present invention have been shown and described, those skilled in the art will be able to make various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A device for detecting the bending amount of a crankshaft blank, characterized in that: The system includes a base plate (1), on which two guide support plates (2), a measuring support mechanism, and two clamping mechanisms for fixing crankshaft blanks are slidably mounted. The guide support plates (2) and clamping mechanisms slide left and right, while the measuring support mechanism slides back and forth. The top of the guide support plates (2) is an inclined surface that is lower in the front and higher in the back. The front end of the top of the guide support plates (2) is provided with a U-shaped groove (3) for placing the crankshaft blank. The two guide support plates (2) are symmetrically arranged, and the two clamping mechanisms are located on opposite sides of the two guide support plates (2). The measuring support mechanism is located on the base plate (1). The measuring support mechanism includes a sliding plate (8), a dial indicator (11), and a support block (13) located between two guide support plates (2). The sliding plate (8) is slidably connected to the base plate (1). A limit rod (14) is fixed on the top of the sliding plate (8). The limit rod (14) slides through the support block (13). The dial indicator (11) is installed at the front end of the support block (13). The probe of the dial indicator (11) extends to the top surface of the support block (13). A shim (9) for adjusting the height of the support block (13) is detachably placed between the support block (13) and the sliding plate (8).
2. The crankshaft blank bending detection device according to claim 1, characterized in that: The limiting rod (14) has a limiting plate fixed at the top and a spring (10) sleeved on the outer wall of the limiting rod (14). The spring (10) is located between the limiting plate and the support block (13). One end of the spring (10) is fixedly connected to the limiting plate and the other end of the spring (10) is fixedly connected to the top of the support block (13).
3. The crankshaft blank bending detection device according to claim 2, characterized in that: There are four limiting rods (14), which are located at the four corners of the slide plate (8). The bottom sides of the support block (13) are provided with connecting plates. The connecting plates are provided with limiting holes corresponding to the number and position of the limiting rods (14). The limiting rods (14) pass through the limiting holes and slide to connect with the connecting plates.
4. The crankshaft blank bending detection device according to claim 1, characterized in that: The base plate (1) has a first sliding groove (5) on the top near the rear side along the left and right direction. The guide support plate (2) has a first slider (6) fixed at the bottom. A first screw (25) is rotatably provided in the first sliding groove (5). A first screw hole is provided on the first slider (6). The first slider (6) is slidably disposed in the first sliding groove (5). The first slider (6) is threadedly connected to the first screw (25) through the first screw hole. A first motor (7) is fixed on one side of the base plate (1). The output end of the first motor (7) is connected to the first screw (25). The threads at both ends of the first screw (25) are opposite in direction, and the first sliders (6) of the two guide support plates (2) are respectively threaded to the two ends of the first screw (25).
5. The crankshaft blank bending detection device according to claim 4, characterized in that: The base plate (1) has a second slide groove (15) at the top near the front side along the front-back direction. The slide plate (8) has a second slider (16) fixed at the bottom. The second slide groove (15) has a second screw (26) rotatably installed inside it. The second slider (16) has a second screw hole. The second slider (16) is slidably installed inside the second slide groove (15). The second slider (16) is threadedly connected to the second screw (26) through the second screw hole. The base plate (1) has a second motor (17) fixed on one side. The output end of the second motor (17) is connected to the second screw (26).
6. The crankshaft blank bending detection device according to claim 5, characterized in that: The second slide groove (15) has two parallel lines. The second screw (26) is provided in one second slide groove (15), and the slide rod (27) is rotatably provided in the other second slide groove (15). There are two second sliders (16). The two second sliders (16) are slidably provided in the two second slide grooves (15). The second screw hole is provided on one second slider (16), and the slide hole is provided on the other second slider (16). The second slider (16) with the slide hole is slidably connected to the slide rod (27) through the slide hole.
7. The crankshaft blank bending detection device according to claim 1, characterized in that: The support block (13) has a accommodating compartment (12) at its front end. The accommodating compartment (12) penetrates the front side of the support block (13). The measuring dial indicator (11) is fixed in the accommodating compartment (12). The top of the front end of the support block (13) has a measuring hole. The measuring hole is connected to the accommodating compartment (12). The probe of the measuring dial indicator (11) extends through the measuring hole to the top surface of the support block (13).
8. The crankshaft blank bending detection device according to claim 1, characterized in that: The clamping mechanism includes a vertical plate (18) and an electric push rod (19). The top of the vertical plate (18) is provided with a V-groove (21) for placing the end of the crankshaft blank. The V-groove (21) corresponds to the position of the U-groove (3). The electric push rod (19) is fixed above the V-groove (21) by a mounting bracket (20). A top block (22) is fixed at the telescopic end of the electric push rod (19). The top block (22) moves closer to or away from the V-groove (21) by the drive of the electric push rod (19).
9. The crankshaft blank bending detection device according to claim 8, characterized in that: The bottom plate (1) has a third sliding groove (23) on the top near the front side along the left and right direction, and the bottom of the upright plate (18) is fixed with a third slider (24), which is slidably disposed in the third sliding groove (23).
10. The crankshaft blank bending detection device according to claim 1, characterized in that: Each of the two guide support plates (2) is provided with a placement platform (4) at the rear of its top. The placement platform (4) is inclined in the same direction as the top of the guide support plate (2). Both of the two placement platforms (4) are provided with baffles at their rear ends and opposite sides.