Auxiliary structure for detecting coaxiality of connecting shaft

Abstract

The utility model provides a kind of auxiliary structure for connecting shaft coaxiality detection, including rigid crossbeam and hollow outer frame, rigid crossbeam upper end right side is provided with slide rail, slide rail is slidably provided with slide base, the longitudinal fixed mobile seat of slide base upper end, rigid crossbeam upper end right side and mobile seat upper end left side are respectively equipped with fixed three-jaw self-centering chuck and movable three-jaw self-centering chuck, rigid crossbeam upper end right side is horizontally fixed with guide slot plate, this design solves the significant shortcomings that the measuring reference of prior art is unstable, installation alignment efficiency is low, there is principle error, and universality is poor, etc., it is difficult to complete coaxiality detection quickly and accurately in complex workshop environment, the utility model can make measuring structure itself form a stable, reference unified rigid platform, all measuring actions are completed on this platform, fundamentally eliminate the error caused by reference in unison, and it is strong in practicality.

Description

Technical Field

[0001] This utility model is an auxiliary structure for detecting the coaxiality of connecting shafts, belonging to the field of coaxiality detection technology. Background Technology

[0002] In the installation and maintenance of mechanical transmission systems (such as fans, pumps, and speed reducers), the coaxiality of connecting shafts is a crucial accuracy indicator. Excessive coaxiality error can lead to equipment vibration, increased noise, accelerated bearing wear, and even serious malfunctions such as shaft breakage. Common testing methods include using dial indicators and micrometers, but ensuring the stable and precise installation and standardization of these tools is key to guaranteeing accurate test results. The specialized bridge-type fixture used in this case features a rigid bridge spanning two shafts, with the measuring instrument mounted in the middle. The magnetic base + V-block combination structure involves attaching the magnetic base to the equipment base or shaft, extending the dial indicator to the surface of the shaft being measured via the indicator rod, and using the V-block to support the shaft.

[0003] However, the bridge plate structure used is usually only suitable for shafts with specific spacing and diameter. When changing products or testing different equipment, different bridge plates need to be customized, which is costly and inflexible. In the magnetic base + V-block combination structure, the magnetic base rod is long and cantilevered, which is easily affected by external forces or vibrations and shakes, resulting in unstable readings. It is also necessary to manually and repeatedly adjust multiple joints of the rod to make the probe vertically aligned with the measured point, which is cumbersome and requires a high level of operator experience. When the reference axis and the measured axis are not at the same height, the magnetic base is usually attached to the equipment base, and there is a height difference between its reference plane and the axis of the measured axis. This will introduce Abbe error in the measurement and affect the accuracy. There is an urgent need for an auxiliary structure for connecting shaft coaxiality testing to solve the above problems. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an auxiliary structure for detecting the coaxiality of connecting shafts, so as to solve the problems mentioned in the background technology. This utility model has the advantages of unified reference, quick installation, stable measurement, strong versatility and the ability to eliminate Abbe error.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an auxiliary structure for detecting the coaxiality of a connecting shaft, comprising a rigid crossbeam and a hollow outer frame. A slide rail is provided on the upper right side of the rigid crossbeam, and a slide block is slidably disposed within the slide rail. A movable seat is longitudinally fixed at the upper end of the slide block. A fixed three-jaw self-centering chuck and a movable three-jaw self-centering chuck are respectively installed on the upper right side of the rigid crossbeam and the upper left side of the movable seat. A guide groove plate is horizontally fixed on the upper right side of the rigid crossbeam, and a hollow outer frame is slidably inserted inside the guide groove plate. A sliding plate is installed on the upper end of the hollow outer frame, and an anti-detachment block is bolted to the front end of the sliding plate. An adjusting inner frame is installed inside the hollow outer frame via two adjusting bolts. A fixing block and a locking cylinder are respectively embedded at the upper and lower ends of the adjusting inner frame. A dial indicator is longitudinally locked inside the locking cylinder via anti-slip bolts. Rubber strips are embedded on both the left and right sides of the lower end of the locking cylinder, and a dial indicator probe is installed at the lower end of the dial indicator.

[0006] Furthermore, a locking screw is installed on the front side of the upper end of the slide block, and the locking screw abuts against the rigid crossbeam.

[0007] Furthermore, a rotating handle is installed on the upper left side of the rigid crossbeam and the upper right side of the movable seat. The two rotating handles are coaxially connected to the fixed three-jaw self-centering chuck and the movable three-jaw self-centering chuck, respectively, and the fixed three-jaw self-centering chuck and the movable three-jaw self-centering chuck are coaxially arranged.

[0008] Furthermore, the upper end of the movable seat is provided with a notch groove, and the guide plate is slidably placed on the notch groove.

[0009] Furthermore, the sliding plate is slidably placed on the upper end of the guide groove plate, and a push-pull handle is installed on the upper end of the sliding plate. The anti-detachment block is slidably located at the front end of the guide groove plate.

[0010] Furthermore, the dial indicator probe damping passes through two rubber strips.

[0011] The beneficial effects of this utility model: This utility model provides an auxiliary structure for detecting the coaxiality of connecting shafts. Because it incorporates a rigid crossbeam, slide rail, slide block, movable seat, movable three-jaw self-centering chuck, fixed three-jaw self-centering chuck, guide groove plate, sliding plate, hollow outer frame, adjusting inner frame, fixing block, locking cylinder, dial indicator, and dial indicator probe, the structure is rationally designed and integrates "cross-axis benchmark unification and fine-tuning measurement." It uses an adjustable-span rigid crossbeam, with self-centering chucks at both ends directly positioning and fixing the two connecting shafts using their own journals as benchmarks. This creates a stable, benchmark-unified rigid platform for the measurement structure, where all measurement actions are completed. This fundamentally eliminates errors caused by inconsistent benchmarks, making it highly practical. Attached Figure Description

[0012] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0013] Figure 1 This is a schematic diagram of an auxiliary structure for detecting the coaxiality of a connecting shaft according to the present invention.

[0014] Figure 2 This is an enlarged schematic diagram of the hollow outer frame connection structure of an auxiliary structure for detecting the coaxiality of a connecting shaft according to this utility model;

[0015] Figure 3 This is a schematic diagram of the dial indicator installation structure for an auxiliary structure used to detect the coaxiality of a connecting shaft according to this utility model.

[0016] In the diagram: 1-rigid crossbeam, 2-slide rail, 3-slide seat, 4-locking screw, 5-moving seat, 6-rotating handle, 7-movable three-jaw self-centering chuck, 8-fixed three-jaw self-centering chuck, 9-guide groove plate, 10-sliding plate, 11-push-pull handle, 12-anti-detachment block, 13-hollow outer frame, 14-adjusting inner frame, 15-fixing block, 16-clamping cylinder, 17-dial indicator, 18-rubber strip, 19-dial indicator probe, 20-adjusting bolt, 21-anti-slip bolt. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0018] Please see Figures 1-3This utility model provides a technical solution: an auxiliary structure for detecting the coaxiality of connecting shafts, including a rigid beam 1 and a hollow outer frame 13. A slide rail 2 is provided on the upper right side of the rigid beam 1, and a slide block 3 is slidably arranged inside the slide rail 2. A movable seat 5 is longitudinally fixed on the upper end of the slide block 3. A fixed three-jaw self-centering chuck 8 and a movable three-jaw self-centering chuck 7 are respectively installed on the upper right side of the rigid beam 1 and the upper left side of the movable seat 5. A guide groove plate 9 is horizontally fixed on the upper right side of the rigid beam 1, and a hollow outer frame 13 is slidably inserted inside the guide groove plate 9. A sliding plate 10 is installed on the upper end of the hollow outer frame 13, and the front end of the sliding plate 10 is bolted to the guide groove plate 9. An anti-detachment block 12 is installed. An adjusting inner frame 14 is installed inside the hollow outer frame 13 through two adjusting bolts 20. A fixing block 15 and a locking cylinder 16 are respectively embedded at the upper and lower ends of the adjusting inner frame 14. A dial indicator 17 is longitudinally locked into the locking cylinder 16 through anti-slip bolts 21. Rubber strips 18 are embedded on both the left and right sides of the lower end of the locking cylinder 16. A dial indicator probe 19 is installed at the lower end of the dial indicator 17. This design solves the significant shortcomings of the existing technology, such as unstable measurement benchmark, low installation and alignment efficiency, existence of principle error, and poor versatility, making it difficult to quickly and accurately complete coaxiality detection in complex workshop environments.

[0019] In the first embodiment of this utility model: a locking screw 4 is installed on the front side of the upper end of the slide block 3, and the locking screw 4 abuts against the rigid crossbeam 1. By sliding the added slide block 3 within the slide rail 2, the moving seat 5 and the movable three-jaw self-centering chuck 7 are adjusted to adapt to the connecting shafts with different wheelbases. After adjustment, the locking screw 4 abuts against the rigid crossbeam 1, locking the slide block 3 in the required position to prevent movement during measurement.

[0020] Rotary handles 6 are installed on the upper left side of the rigid crossbeam 1 and the upper right side of the movable seat 5. The two rotary handles 6 are coaxially connected to the fixed three-jaw self-centering chuck 8 and the movable three-jaw self-centering chuck 7, respectively. The fixed three-jaw self-centering chuck 8 and the movable three-jaw self-centering chuck 7 are coaxially set. The added rotary handles 6 facilitate the rotation of the fixed three-jaw self-centering chuck 8 and the movable three-jaw self-centering chuck 7.

[0021] The upper end of the movable base 5 has a notch and groove, and the guide plate 9 slides on the notch and groove. The sliding plate 10 slides on the upper end of the guide plate 9, and a push-pull handle 11 is installed on the upper end of the sliding plate 10. The anti-detachment block 12 slides at the front end of the guide plate 9. The sliding plate 10 slides on the upper end of the guide plate 9 and can be easily moved left and right by the push-pull handle 11. The anti-detachment block 12 is installed at the front end of the sliding plate 10 by bolts and slides at the front end of the guide plate 9 to prevent the sliding plate 10 from falling off during movement.

[0022] The dial indicator probe 19 is damped by passing through two rubber strips 18. The rubber strips 18 embedded on the left and right sides of the lower end of the added clip cylinder 16 allow the dial indicator probe 19 to pass through, effectively reducing vibration and shaking during measurement and ensuring stable readings.

[0023] As a second embodiment of this utility model: First, the rigid crossbeam 1 is clamped onto the journals of the two connecting shafts to be measured by a fixed three-jaw self-centering chuck 8 and a movable three-jaw self-centering chuck 7, respectively. Using an existing chuck wrench, the fixed three-jaw self-centering chuck 8 and the movable three-jaw self-centering chuck 7 are quickly centered and clamped onto the journals, ensuring that the two chucks are coaxially aligned, thus forming a stable, uniformly referenced rigid platform. By turning the adjusting bolt 20, the position of the inner adjusting frame 14 within the hollow outer frame 13 is precisely controlled, thereby fine-tuning the angle and distance of the dial indicator 17 relative to the connecting shaft. The fixing block 15 is embedded in the upper part of the inner adjusting frame 14 to enhance structural rigidity; the inserting cylinder 16 is embedded in the lower part of the inner adjusting frame 14, and the dial indicator 17 is longitudinally fixed therein by anti-slip bolts 21. The rubber strip 18 is embedded on the lower left and right sides of the insert cylinder 16, which not only provides damping but also anti-slip and shock absorption effects, ensuring that the dial indicator probe 19 remains stable when in contact with the shaft surface.

[0024] During measurement, the operator moves the sliding plate 10 and the hollow outer frame 13 by pushing and pulling the handle 11, allowing the dial indicator probe 19 to slide along the surface of the connecting shaft. Fine-tuning the inner frame 14 using the adjusting bolt 20 allows for precise alignment of the measurement point, avoiding the tedious process of repeatedly adjusting the dial indicator rod manually. The reading of the dial indicator 17 directly reflects the coaxiality error. Because the entire measurement platform is based on a unified benchmark, the inherent error caused by height differences is eliminated.

[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An auxiliary structure for detecting the coaxiality of a connecting shaft, comprising a rigid crossbeam (1) and a hollow outer frame (13), characterized in that: A slide rail (2) is provided on the upper right side of the rigid beam (1), and a slide block (3) is slidably arranged inside the slide rail (2). A movable seat (5) is longitudinally fixed on the upper end of the slide block (3). A fixed three-jaw self-centering chuck (8) and a movable three-jaw self-centering chuck (7) are respectively installed on the upper right side of the rigid beam (1) and the upper left side of the movable seat (5). A guide groove plate (9) is horizontally fixed on the upper right side of the rigid beam (1). A hollow outer frame (13) is slidably inserted inside the guide groove plate (9). A sliding seat is installed on the upper end of the hollow outer frame (13). The sliding plate (10) has an anti-detachment block (12) installed at the front end by bolts. The hollow outer frame (13) has an adjusting inner frame (14) installed inside by two adjusting bolts (20). The adjusting inner frame (14) has a fixing block (15) and a locking cylinder (16) embedded at the upper and lower ends respectively. The locking cylinder (16) has a dial indicator (17) inserted longitudinally by anti-slip bolts (21). Rubber strips (18) are embedded on the left and right sides of the lower end of the locking cylinder (16). The dial indicator (17) has a dial indicator probe (19) installed at the lower end.

2. The auxiliary structure for detecting the coaxiality of a connecting shaft according to claim 1, characterized in that: The upper front side of the slide block (3) is equipped with a locking screw (4), and the locking screw (4) abuts against the rigid crossbeam (1).

3. The auxiliary structure for detecting the coaxiality of a connecting shaft according to claim 1, characterized in that: Rotary handles (6) are installed on the upper left side of the rigid crossbeam (1) and the upper right side of the movable seat (5). The two rotary handles (6) are coaxially connected to the fixed three-jaw self-centering chuck (8) and the movable three-jaw self-centering chuck (7), respectively, and the fixed three-jaw self-centering chuck (8) and the movable three-jaw self-centering chuck (7) are coaxially arranged.

4. The auxiliary structure for detecting the coaxiality of a connecting shaft according to claim 1, characterized in that: The upper end of the movable seat (5) is provided with a notch and a guide plate (9) is slidably placed at the notch and the guide plate (9) is placed at the notch and the guide plate (9).

5. The auxiliary structure for detecting the coaxiality of a connecting shaft according to claim 1, characterized in that: The sliding plate (10) is slidably placed on the upper end of the guide groove plate (9), and a push-pull handle (11) is installed on the upper end of the sliding plate (10). The anti-detachment block (12) is slidably located at the front end of the guide groove plate (9).

6. The auxiliary structure for detecting the coaxiality of a connecting shaft according to claim 1, characterized in that: The dial gauge probe (19) is damped by passing through two rubber strips (18).

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