Centering device adopting super-long dummy shaft
By using a diagonal bracing structure with reinforcing tubes and connecting components in the ultra-long dummy shaft centering device, the problem of head deflection of the ultra-long dummy shaft was solved, achieving efficient equipment centering, simplifying the manufacturing and installation process, and reducing costs.
Patent Information
- Application Number
- CN202520122515.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-17
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2035-01-17
AI Technical Summary
In the installation of mechanical equipment, the downward deflection of the head of an extra-long dummy shaft can cause deviations in centering data, affecting the quality of equipment installation, especially making centering between the motor and the transmission equipment difficult.
The centering device, which employs an extra-long dummy shaft, includes a base, a central tube, and a reinforcing tube. The stability of the central tube is ensured by the diagonal reinforcement structure of the reinforcing tube, combined with the connecting assembly of locking bolts and springs. A dial indicator is used for precise measurement.
It effectively prevents the dummy shaft head from deflecting, improves centering accuracy, simplifies the manufacturing process, reduces costs, shortens operation time, improves centering efficiency, and reduces construction difficulty.
Smart Images
Figure CN223841085U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of equipment installation, and in particular to a centering device using an ultra-long dummy shaft. Background Technology
[0002] In industrial equipment installation projects, centering work is common in mechanical equipment installation. When the intermediate shaft between the couplings of the equipment that needs to be centered is long, it is not possible to directly measure the centering data using a dial indicator. Therefore, it is necessary to make a dummy shaft to fix the dial indicator for centering.
[0003] If the distance between a motor requiring centering and the transmission equipment is too far and a rigid transmission shaft is used, a dummy shaft is set between the motor and the transmission equipment. Existing dummy shafts often exhibit a downward sag at the head due to insufficient rigidity, causing deviations in the centering dial indicator readings, thereby affecting the centering and installation quality of the equipment. Utility Model Content
[0004] This utility model provides a centering device using an ultra-long dummy shaft, which has the technical effect of reducing the downward deflection of the dummy shaft.
[0005] A centering device employing an ultra-long dummy shaft adopts the following technical solution:
[0006] A centering device employing an extra-long dummy shaft comprises a base, a central tube, and reinforcing tubes. A fixed-end coupling is installed on one side of the base. One end of the central tube is fixed at the center of the base. Multiple reinforcing tubes are evenly arranged along the axis of the central tube. One end of each reinforcing tube is fixed to the base, and the other end is fixed to the wall of the central tube. A non-fixed-end coupling is installed at the end of the central tube away from the base. A dial indicator is installed on the wall of the central tube away from the base, with its magnetic base adsorbed onto the wall of the central tube. The dial indicator measures the non-fixed-end coupling. A connecting assembly is installed on the fixed-end coupling, and the base is fixed to the fixed-end coupling via the connecting assembly.
[0007] Furthermore, the base is a cross-shaped plate, and four reinforcing tubes are provided. The ends of the four reinforcing tubes near the cross-shaped plate are respectively fixed at the four corners of the cross-shaped plate.
[0008] Furthermore, the connecting assembly includes connecting posts, abutment plates, and springs. Multiple connecting posts are evenly fixed in the circumferential direction of the fixed-end coupling. Each connecting post corresponds to an abutment plate, which is sleeved with the connecting post. The spring is sleeved on the connecting post and fixed between the abutment plate and the fixed-end coupling. The base has connecting holes corresponding to the connecting posts. Each connecting post has a groove on its top surface. The connecting post is inserted into the connecting hole, and the base presses against the abutment plate. When the base is aligned with the groove, the base falls down into the groove.
[0009] Furthermore, the fixed end coupling is equipped with multiple locking bolts, which pass through the fixed end coupling and the base and are threadedly connected to locking nuts.
[0010] Compared with the prior art, the present invention has the following technical effects:
[0011] This utility model's centering device has a simple structure, effectively preventing the dummy shaft from sagging downwards and solving the problem of difficulty in centering and aligning between transmission devices due to excessive coupling distance. The device's greatest advantage is that it resolves the contradiction between high rigidity and light weight in the dummy shaft. The inclined reinforcement structure ensures the dummy shaft maintains high rigidity and prevents sagging, while the use of steel pipes for the main body and reinforcement reduces weight. The device is readily available, simple to manufacture, and low in cost, improving the centering efficiency of ultra-long transmission shaft equipment, significantly shortening operation time, and reducing construction technical difficulty. Attached Figure Description
[0012] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of it, do not constitute a limitation thereof. In the drawings:
[0013] Figure 1 This is a schematic diagram illustrating the overall structure of Embodiment 1 of the present invention;
[0014] Figure 2 This is a schematic diagram illustrating the base, central tube, and reinforcing tube in Embodiment 1 of this utility model;
[0015] Figure 3 This is a schematic diagram illustrating the connection between the fixed-end coupling and the base in Embodiment 2 of this utility model;
[0016] Figure 4 This is a schematic diagram illustrating the connecting column and the sinkhole in Embodiment 2 of this utility model;
[0017] Figure 5 This is a schematic diagram illustrating the connecting components in Embodiment 2 of this utility model.
[0018] Explanation of reference numerals in the attached drawings: 1. Base; 11. Connecting hole; 2. Center tube; 3. Reinforcing tube; 4. On the fixed end coupling; 5. Non-fixed end coupling; 6. Connecting assembly; 61. Locking bolt; 62. Locking nut; 63. Connecting column; 631. Slot; 64. Abutment plate; 65. Spring; 7. Dial indicator. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this utility model are used to explain the present utility model, but are not intended to limit the present utility model.
[0020] Embodiment 1 of this utility model
[0021] Reference Figure 1 and Figure 2 A centering device employing an extra-long dummy shaft includes a base 1, a central tube 2, and a reinforcing tube 3. The base 1 is a cross-shaped plate and is mounted on a fixed-end coupling 4. A connecting assembly 6 is provided on the fixed-end coupling 4, and the base 1 is connected to the fixed-end coupling 4 through the connecting assembly 6. The centering device of this application is located between the fixed-end coupling 4 and the non-fixed-end coupling 5.
[0022] One end of the central tube 2 is fixed to the center of the base 1, and four reinforcing tubes 3 are provided. One end of the reinforcing tube 3 is fixed to the base 1, and the other end of the reinforcing tube 3 is fixed to the outer wall of the central tube 2. The ends of the four reinforcing tubes 3 near the cross-shaped plate are respectively fixed to the four corners of the cross-shaped plate. By setting the reinforcing tubes 3 to fix the central tube 2, the stability of the central tube 2 is increased, and the downward deflection of the head of the central tube 2 is reduced. Both the central tube 2 and the reinforcing tubes 3 are made of seamless steel pipes.
[0023] The connecting assembly 6 includes locking bolts 61 and locking nuts 62. Multiple locking bolts 61 are provided on the fixed-end coupling 4, passing through the fixed-end coupling 4 and the base 1, and are threadedly connected to the locking nuts 62. A dial indicator 7 is provided on the side of the central tube 2 away from the fixed-end coupling 4. The magnetic base of the dial indicator 7 is attracted to the wall of the central tube 2. The dial indicator is used on the non-fixed-end coupling 5 for equipment centering adjustment and measurement.
[0024] The implementation principle of Embodiment 1 of this utility model is as follows: When performing centering operations on motors and transmission equipment that are far apart, a base 1 for a dummy shaft is first fabricated. The rear steel plate is cut into a cross shape, and the center tube 2 and the reinforcing tube 3 are welded to the base 1. The two adjacent reinforcing tubes 3 are spaced 90 degrees apart in the circumferential direction to form a stable and lightweight structure. Then, the entire device is fixed to the fixed-end coupling 4 through the connecting assembly 6. Then, the dial indicator 7 used for centering is attached to the center tube 2, and the dial indicator is used on the non-fixed-end coupling 5 to perform qualitative adjustments and measurements of the equipment.
[0025] This device features a simple structure and solves the problem of difficulty in centering and alignment caused by excessively large coupling distances between transmission devices. Its most significant advantage is resolving the contradiction between high rigidity and light weight required for the dummy shaft. The inclined tension reinforcement structure ensures the dummy shaft maintains high rigidity without deflection, while the use of steel pipes for the main body and reinforcement achieves weight reduction. The device is readily available, simple to manufacture, and low in cost, improving the centering efficiency of ultra-long drive shaft equipment, significantly shortening operation time, and reducing construction technical difficulty.
[0026] Embodiment 2 of this utility model
[0027] Reference Figure 3 , Figure 4 and Figure 5 The difference from Embodiment 1 is that the connecting assembly 6 includes connecting posts 63, abutment plates 64, and springs 65. Four connecting posts 63 are evenly fixed in the circumferential direction of the fixed-end coupling 4. Each connecting post 63 corresponds to one abutment plate 64, which is sleeved onto the connecting post 63. Springs 65 are sleeved on the connecting posts 63 and fixed between the abutment plates 64 and the fixed-end coupling 4. A connecting hole 11 is provided on the base 1, with each connecting post 63 corresponding to one connecting hole 11. A countersunk groove 631 is provided on the top surface of each connecting post 63.
[0028] The implementation principle of Embodiment 2 of this utility model is as follows: When installing the base 1, align the connecting hole 11 on the base 1 with the corresponding connecting post 63, insert the connecting post 63 into the connecting hole 11, and the base 1 presses against the abutment plate 64. The abutment plate 64 presses against the spring 65. When the base 1 is directly above the recess 631, the base 1 moves downward into the recess 631. At this time, the axis of the fixed end coupling 4 coincides with the axis of the central tube 2. After the base 1 moves down into the recess 631, the abutment plate 64 presses against the base 1 under the action of the spring 65, thereby fixing the base 1. The connecting component 6 in Embodiment 2 has a simple structure, is easy to implement, and facilitates the installation and disassembly of the base 1.
[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.
Claims
1. A centering device employing an ultra-long dummy shaft, characterized in that, The base (1), the center tube (2) and the reinforcing tube (3) are provided. A fixed end coupling (4) is provided on one side of the base (1). One end of the center tube (2) is fixed at the center of the base (1). Multiple reinforcing tubes (3) are evenly arranged along the axis of the center tube (2). One end of the reinforcing tube (3) is fixed to the base (1), and the other end of the reinforcing tube (3) is fixed to the tube wall of the center tube (2). A non-fixed end coupling (5) is provided at the end of the center tube (2) away from the base (1). A dial indicator (7) is provided on the tube wall of the center tube (2) away from the base (1). The magnetic base of the dial indicator (7) is attracted to the tube wall of the center tube (2). The dial indicator (7) measures the non-fixed end coupling (5). A connecting component (6) is provided on the fixed end coupling (4). The base (1) is fixed to the fixed end coupling (4) through the connecting component (6).
2. The centering device employing an ultra-long dummy shaft according to claim 1, characterized in that, The base (1) is a cross-shaped plate, and four reinforcing tubes (3) are provided. The ends of the four reinforcing tubes (3) near the cross-shaped plate are respectively fixed at the four corners of the cross-shaped plate.
3. The centering device employing an ultra-long dummy shaft according to claim 1, characterized in that, The connecting assembly (6) includes a connecting post (63), an abutment plate (64), and a spring (65). Multiple connecting posts (63) are evenly fixed in the circumferential direction of the fixed end coupling (4). Each connecting post (63) corresponds to an abutment plate (64). The abutment plate (64) is sleeved with the connecting post (63). The spring (65) is sleeved on the connecting post (63) and fixed between the abutment plate (64) and the fixed end coupling (4). The base (1) has a connecting hole (11) corresponding to the connecting post (63). Each connecting post (63) has a groove (631) on its top surface. The connecting post (63) is inserted into the connecting hole (11). The base (1) presses the abutment plate (64). When the base (1) is aligned with the groove (631), the base (1) falls down into the groove (631).
4. The centering device employing an ultra-long dummy shaft according to claim 1, characterized in that, The fixed end coupling (4) is provided with multiple locking bolts (61), which pass through the fixed end coupling (4) and the base (1) and are threaded with locking nuts (62).