Shaft workpiece deflection measuring instrument

Abstract

This utility model discloses a shaft workpiece runout measuring instrument, specifically relating to the technical field of runout measuring instruments. It includes a base, on which two shaft workpieces to be tested are simultaneously mounted. A central column is located on top of each shaft workpiece, positioned between the two workpieces. A U-shaped bracket is mounted on top of each workpiece, with rollers rotatably connected to the inner wall of the U-shaped bracket. Anti-slip rubber rings are fixed to the outer ends of the rollers. A connecting frame is fixed to the side of the U-shaped bracket facing the central column. This utility model uses a dial indicator to detect the runout of the shaft workpiece by placing the rollers on top of it and utilizing the undulations of the U-shaped bracket. The dial indicator's sensing end contacts the U-shaped bracket without friction, thus avoiding wear on the sensing end, extending the dial indicator's service life, and improving the accuracy of subsequent tests.

Description

Technical Field

[0001] This utility model relates to the technical field of runout measuring instruments, specifically to a runout measuring instrument for shaft-type workpieces. Background Technology

[0002] Shaft-type workpieces are core components in mechanical transmission systems, mainly used to transmit torque, support rotating parts and maintain their motion accuracy. Shaft-type workpieces are also included in automotive parts, such as rotating shafts, drive shafts, and crankshafts.

[0003] After shaft-type workpieces are manufactured, they need to be tested for runout to ensure the geometric accuracy and dynamic stability of rotating parts. Runout testing requires specialized testing equipment, such as a shaft-type workpiece runout measuring instrument with publication number CN220853366U in the prior art.

[0004] However, during the testing process, the dial indicator's testing end comes into direct contact with the shaft-like workpiece, which is in a high-speed rotating state. Therefore, the testing end of the dial indicator will inevitably rub against the workpiece surface, causing wear and reducing the measurement accuracy. Utility Model Content

[0005] The purpose of this invention is to provide a shaft workpiece runout measuring instrument. By converting the runout of the shaft workpiece into the undulation of a U-shaped bracket, the dial indicator directly measures the U-shaped bracket. The measuring end of the dial indicator contacts the U-shaped bracket without friction, thus avoiding wear on the measuring end of the dial indicator, extending the service life of the dial indicator, and improving the accuracy of subsequent tests.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a shaft workpiece runout measuring instrument for detecting shaft workpieces, including a base, two shaft workpieces to be detected are simultaneously arranged on the top of the base, and a central column is provided on the top of each shaft workpiece, with the central column located between the two shaft workpieces. The top of the shaft-type workpiece is provided with a U-shaped bracket, and a roller is rotatably connected to the inner wall of the U-shaped bracket. An anti-slip rubber ring is fixed to the outer end of the roller. The anti-slip rubber ring is made of hard rubber material and has low elasticity. A connecting frame is fixedly installed on the side of the U-shaped bracket facing the central column. A movable block is bolted to the side of the connecting frame away from the U-shaped bracket. The movable block is slidably connected to the outer surface of the central column via a slide rail. A dial indicator is installed on the top of the U-shaped bracket, and the measuring end of the dial indicator is in contact with the top of the U-shaped bracket.

[0007] Furthermore, the top of the movable block is provided with a dial indicator mounting bracket, which is bolted to the outer surface of the central column. The front end of the dial indicator mounting bracket is a concave clamping plate, and the dial indicator is clamped in the clamping plate.

[0008] Furthermore, a linear motor is fixedly mounted on the top of the shaft-like workpiece, and the bottom of the central column is fixedly connected to the moving part of the linear motor.

[0009] Furthermore, a first sleeve and a second sleeve are respectively fitted at both ends of the shaft-like workpiece. An annular airbag is fixedly provided on the inner wall of the first sleeve, and the annular airbag is fitted on the outer end of the shaft-like workpiece. A buffer pad that contacts the corresponding end of the shaft-like workpiece is fixedly provided on the inner wall of the first sleeve. An inflation tube with a valve is fixedly provided at the outer end of the first sleeve. One end of the inflation tube communicates with the inside of the annular airbag. The internal and external structures of the first sleeve and the second sleeve are completely identical, and the only difference between them is their positions. Therefore, the internal structure of the second sleeve will not be described in detail here.

[0010] Furthermore, two upright plates are fixedly provided at the top of the shaft-like workpiece, and a movable disk is provided on the side of the upright plate facing the shaft-like workpiece. Two second sleeves are respectively rotatably connected to one side of the two movable disks.

[0011] Furthermore, a threaded push rod is rotatably connected to the other side of the movable disk. One end of the threaded push rod passes through the corresponding upright plate and is threadedly connected to the upright plate. A handle is fixedly provided on the side of the threaded push rod away from the movable disk. Multiple guide rods are provided on the upright plate, passing through the upright plate. The guide rods are located outside the threaded push rod, and one end of the guide rod is fixedly connected to the movable disk.

[0012] Furthermore, an end plate is fixedly provided at the top of the shaft-type workpiece, and two first sleeves are both provided on one side of the end plate.

[0013] Furthermore, the other side of the end plate is provided with two pulleys for driving the first sleeve to rotate. The two pulleys correspond to the two first sleeves respectively. A connecting shaft is provided between the pulleys and the corresponding first sleeves to connect the two. The connecting shaft passes through the end plate and is rotatably connected to the end plate. The two pulleys are connected by belt drive. A crank is rotatably connected to one side of one of the pulleys.

[0014] The technical effects and advantages provided by this utility model in the above technical solution are as follows: By placing the roller on top of the shaft workpiece, the roller and the anti-slip rubber ring rotate synchronously with the shaft workpiece during the inspection process, which transforms the sliding friction that originally acted on the shaft workpiece into rolling friction, greatly reducing the wear on the shaft workpiece during the inspection process. If the runout of a shaft-type workpiece is abnormal, it will cause the U-shaped bracket to fluctuate up and down. The dial indicator uses the fluctuation of the U-shaped bracket to detect the runout of the shaft-type workpiece. The measuring end of the dial indicator contacts the U-shaped bracket without friction, thus avoiding wear on the measuring end of the dial indicator, extending the service life of the dial indicator, and improving the accuracy of subsequent tests. Attached Figure Description

[0015] Figure 1 This is an overall structural diagram of the present invention; Figure 2 This is a structural diagram of the central column of this utility model; Figure 3 This is a structural diagram of the end plate and the first sleeve of this utility model; Figure 4 This is a structural diagram of the upright plate and the second sleeve of this utility model; Figure 5 This is a diagram of the internal structure of the first sleeve of this utility model.

[0016] Explanation of reference numerals in the attached figures: 1. Shaft-type workpiece; 2. Base; 3. Linear motor; 4. Central column; 5. Dial indicator; 501. Dial indicator mounting bracket; 6. U-shaped bracket; 601. Roller; 602. Anti-slip rubber ring; 603. Connecting frame; 604. Moving block; 7. First sleeve; 701. Annular airbag; 702. Buffer pad; 8. Second sleeve; 9. Vertical plate; 901. Moving disc; 902. Guide rod; 903. Threaded push rod; 10. End plate; 1001. Pulley; 1002. Handle; 1003. Belt. Detailed Implementation

[0017] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0018] This utility model provides, for example Figures 1-5 The instrument shown is a shaft workpiece runout measuring instrument used to inspect shaft workpiece 1. It includes a base 2, on the top of which two shaft workpieces 1 to be inspected are simultaneously provided. A first sleeve 7 and a second sleeve 8 are respectively fitted at both ends of the shaft workpiece 1. An annular airbag 701 is fixedly provided on the inner wall of the first sleeve 7 and is fitted on the outer end of the shaft workpiece 1. A buffer pad 702 is fixedly provided on the inner wall of the first sleeve 7 and contacts the corresponding end of the shaft workpiece 1. An inflation tube with a valve is fixedly provided at the outer end of the first sleeve 7. One end of the inflation tube communicates with the inside of the annular airbag 701. The internal and external structures of the first sleeve 7 and the second sleeve 8 are completely identical, only their positions are different. Therefore, the internal structure of the second sleeve 8 will not be described in detail here.

[0019] One end of the shaft-like workpiece 1 is inserted into the first sleeve 7. Then, air is injected into the annular airbag 701 through the inflation tube. After the annular airbag 701 is inflated, it expands and the inner space contracts. Therefore, the annular airbag 701 can initially clamp and fix one end of the shaft-like workpiece 1 in the center position inside the first sleeve 7. Then, the second sleeve 8 is moved so that the second sleeve 8 gradually approaches the first sleeve 7. As the second sleeve 8 moves, the other end of the shaft-like workpiece 1 is inserted into the second sleeve 8 and fixed. The fixing method of the shaft-like workpiece 1 inside the second sleeve 8 is the same as the fixing method inside the first sleeve 7. In this way, the first sleeve 7, the second sleeve 8, and the shaft-like workpiece 1 can rotate coaxially. Then, the second sleeve 8 moves further to clamp the shaft-like workpiece 1 between the first sleeve 7 and the second sleeve 8. Both ends of the shaft-like workpiece 1 are in close contact with the buffer pads 702 on the inner walls of the first sleeve 7 and the second sleeve 8, respectively.

[0020] To accommodate shaft-type workpieces of varying lengths, such as Figure 1 , Figure 4 , Figure 5 As shown, two upright plates 9 are fixedly provided at the top of the shaft workpiece 1. A movable disk 901 is provided on the side of the upright plate 9 facing the shaft workpiece 1. Two second sleeves 8 are rotatably connected to one side of the two movable disks 901 respectively.

[0021] A threaded push rod 903 is rotatably connected to the other side of the movable disk 901. One end of the threaded push rod 903 passes through the corresponding upright plate 9 and is connected to the upright plate 9 by threads. A handle is fixedly provided on the side of the threaded push rod 903 away from the movable disk 901. A plurality of guide rods 902 passing through the upright plate 9 are provided on the upright plate 9. The guide rods 902 are located outside the threaded push rod 903. One end of the guide rod 902 is fixedly connected to the movable disk 901.

[0022] During the process of fixing the shaft workpiece 1, it is necessary to control the movement of the second sleeve 8 so that it gradually approaches the first sleeve 7. During the adjustment process, the threaded push rod 903 is rotated by the handle. Under the action of the thread, the threaded push rod 903 moves relative to the vertical plate 9 and pushes the moving disk 901, which in turn drives the second sleeve 8 to move. When the moving disk 901 moves, it drives the guide rod 902 to slide relative to the vertical plate 9. The guide rod 902 can restrict the moving disk 901, prevent the moving disk 901 from rotating with the threaded push rod 903, and at the same time ensure that the moving disk 901 can move along a straight line.

[0023] During inspection, it is necessary to rotate shaft-type workpiece 1, such as... Figure 1 , Figure 3As shown, the top end of the shaft workpiece 1 is fixedly provided with an end plate 10, and two first sleeves 7 are provided on one side of the end plate 10. On the other side of the end plate 10, there are two pulleys 1001 for driving the first sleeves 7 to rotate. The two pulleys 1001 correspond to the two first sleeves 7 respectively. A connecting shaft (not shown in the figure) is provided between the pulleys 1001 and the corresponding first sleeves 7 to connect the two. The connecting shaft passes through the end plate 10 and is rotatably connected to the end plate 10. The two pulleys 1001 are connected by a belt 1003. A crank handle 1002 is rotatably connected to one side of one of the pulleys 1001.

[0024] After fixing the shaft workpiece 1, during the subsequent inspection process, the crank handle 1002 can be held to drive one of the pulleys 1001 to rotate. Driven by the belt 1003, the two pulleys 1001 rotate synchronously and drive the two first sleeves 7 to rotate synchronously through the connecting shaft. Then the first sleeves 7 drive the fixed shaft workpiece 1 to rotate, thereby detecting the runout of the shaft workpiece 1 during the rotation. This method can detect two shaft workpieces 1 at the same time, which is more efficient than the existing technology.

[0025] To improve detection accuracy, such as Figure 1 , Figure 2 As shown, the shaft workpiece 1 has a central column 4 at its top, which is located between two shaft workpieces 1. A linear motor 3 is fixedly installed at the top of the shaft workpiece 1, and the bottom of the central column 4 is fixedly connected to the moving part of the linear motor 3. The top of the shaft workpiece 1 is provided with a U-shaped bracket 6. A roller 601 is rotatably connected to the inner wall of the U-shaped bracket 6. An anti-slip rubber ring 602 is fixedly provided at the outer end of the roller 601. The anti-slip rubber ring 602 is made of hard rubber material and has low elasticity. The roller 601 and the anti-slip rubber ring 602 have been tested in advance to ensure that their own sway is not a problem. A connecting frame 603 is fixedly installed on the side of the U-shaped bracket 6 facing the central column 4. A moving block 604 is bolted to the side of the connecting frame 603 away from the U-shaped bracket 6. The moving block 604 is slidably connected to the outer surface of the central column 4 via a slide rail. The U-shaped bracket 6, roller 601, anti-slip rubber ring 602, connecting frame 603, and moving block 604 are lightweight and will not put much pressure on the shaft workpiece 1. A dial indicator 5 is provided on the top of the U-shaped bracket 6. The measuring end of the dial indicator 5 is in contact with the top of the U-shaped bracket 6. A dial indicator mounting bracket 501 is provided on the top of the moving block 604. The dial indicator mounting bracket 501 is bolted to the outer surface of the central column 4. The front end of the dial indicator mounting bracket 501 is a concave clamping plate. The dial indicator 5 is clamped in the clamping plate and can be separated from the dial indicator mounting bracket 501.

[0026] Two rollers 601 are placed directly above the two fixed shaft-like workpieces 1, with the anti-slip rubber ring 602 in direct contact with the outer end of the shaft-like workpiece 1. The linear motor 3 drives the central column 4 to move, which in turn drives the rollers 601 to move along the shaft-like workpiece 1, thereby detecting the runout at various parts of the outer end of the shaft-like workpiece 1. During the rotation of the shaft-like workpiece 1, the rollers 601 and the anti-slip rubber ring 602 will rotate. If the runout of the shaft-like workpiece 1 at the detection point is normal, the rollers 601 and the anti-slip rubber ring 602 will also rotate normally, and the dial indicator 5 will not detect any significant up-and-down movement of the U-shaped bracket 6. If the runout of the shaft workpiece 1 at the detection location is abnormal, the rotation of the shaft workpiece 1 will cause the roller 601 and the anti-slip rubber ring 602 to rise and fall. The U-shaped bracket 6 will therefore rise and fall, causing the moving block 604 to slide up and down relative to the central column 4. The rise and fall of the U-shaped bracket 6 will cause the detection end of the dial indicator 5 to extend and retract, resulting in a significant change in the reading of the dial indicator 5, thereby detecting the runout of the shaft workpiece 1. This runout detection method is a common existing technology. The above content only describes the phenomenon in the detection process, and its principle will not be elaborated here.

[0027] In the prior art, the measuring end of the dial indicator 5 directly contacts the surface of the shaft workpiece 1, sensing the undulations generated by the shaft workpiece 1 during rotation. This causes wear on both the dial indicator 5 and the measuring end of the shaft workpiece 1. However, in this invention, the measuring end of the dial indicator 5 contacts the U-shaped bracket 6. The U-shaped bracket 6 only moves up and down and does not rub against the measuring end of the dial indicator 5, thus preventing wear on the measuring end of the dial indicator 5, extending the service life of the dial indicator 5, and improving the accuracy of subsequent tests. The roller 601 and the anti-slip rubber ring 602 that contact the shaft workpiece 1 roll with the shaft workpiece 1. There is only rolling friction between the anti-slip rubber ring 602 and the shaft workpiece 1, which greatly reduces the wear on the shaft workpiece 1 and the anti-slip rubber ring 602.

Claims

1. A shaft workpiece runout measuring instrument for detecting shaft workpieces (1), comprising a base (2), wherein two shaft workpieces (1) to be detected are simultaneously disposed on the top of the base (2), characterized in that: The shaft workpiece (1) is provided with a central column (4) at the top. The shaft workpiece (1) is provided with a U-shaped bracket (6) at the top. A roller (601) is rotatably connected to the inner wall of the U-shaped bracket (6). An anti-slip rubber ring (602) is fixedly provided at the outer end of the roller (601). A connecting frame (603) is fixedly provided on the side of the U-shaped bracket (6) facing the central column (4). A moving block (604) is bolted to the side of the connecting frame (603) away from the U-shaped bracket (6). The moving block (604) is slidably connected to the outer surface of the central column (4). A dial indicator (5) is provided on the top of the U-shaped bracket (6). The detection end of the dial indicator (5) is in contact with the top of the U-shaped bracket (6).

2. The shaft workpiece runout measuring instrument according to claim 1, characterized in that: The top of the movable block (604) is provided with a dial indicator mounting bracket (501), which is connected to the outer surface of the central column (4). The front end of the dial indicator mounting bracket (501) is a concave plate, and the dial indicator (5) is stuck in the plate.

3. The shaft workpiece runout measuring instrument according to claim 1, characterized in that: The top of the shaft workpiece (1) is fixedly equipped with a linear motor (3), and the bottom of the central column (4) is fixedly connected to the mover of the linear motor (3).

4. The shaft-type workpiece runout measuring instrument according to claim 1, characterized in that: The shaft workpiece (1) is fitted with a first sleeve (7) and a second sleeve (8) at both ends. An annular airbag (701) is fixed on the inner wall of the first sleeve (7). A buffer pad (702) that contacts one end of the shaft workpiece (1) is fixed on the inner wall of the first sleeve (7). An inflation tube with a valve is fixed on the outer end of the first sleeve (7). One end of the inflation tube communicates with the inside of the annular airbag (701). The internal and external structures of the first sleeve (7) and the second sleeve (8) are completely identical.

5. The shaft workpiece runout measuring instrument according to claim 4, characterized in that: The top of the shaft workpiece (1) is fixed with two upright plates (9), and the upright plates (9) are provided with a movable disk (901) on the side facing the shaft workpiece (1). Two second sleeves (8) are rotatably connected to one side of the two movable disks (901).

6. The shaft workpiece runout measuring instrument according to claim 5, characterized in that: The other side of the movable disk (901) is rotatably connected to a threaded push rod (903). One end of the threaded push rod (903) passes through the corresponding upright plate (9) and is connected to the upright plate (9) by a thread. The upright plate (9) is provided with a plurality of guide rods (902) that pass through the upright plate (9). One end of the guide rod (902) is fixedly connected to the movable disk (901).

7. The shaft workpiece runout measuring instrument according to claim 4, characterized in that: The top of the shaft workpiece (1) is fixedly provided with an end plate (10), and the two first sleeves (7) are both provided on one side of the end plate (10).

8. The shaft workpiece runout measuring instrument according to claim 7, characterized in that: The other side of the end plate (10) is provided with two pulleys (1001) for driving the first sleeve (7) to rotate. The two pulleys (1001) are connected by a belt (1003) for transmission. One of the pulleys (1001) is rotatably connected to a crank (1002).

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