A device for measuring the coaxiality of a bearing tester rotor

Abstract

A coaxiality measuring device for the rotor of a bearing tester, belonging to the technical field of rotor coaxiality measurement. The present invention is to solve the problem that when measuring the coaxiality of the driving motor and the test rotor of a bearing tester, it is necessary to rely on a laser alignment instrument, which is cumbersome to operate and occupies a large space. The measuring device described in this application includes a fixing component, a locking pin component, a support rod, a sliding rod, and a dial indicator. The fixing component is sleeved on the outer circumferential surface of the coupling of the driving motor. The support rod is arranged on the fixing component. One end of the support rod is detachably connected to the fixing component through the locking pin component. The other end of the support rod is provided with a sliding rod. The sliding rod is sleeved on the outer circumferential surface of the other end of the support rod. The other end of the sliding rod is provided with a dial indicator. The dial indicator is detachably connected to the sliding rod through a locking bolt. The contact end of the dial indicator contacts the outer circumferential surface of the rotor of the bearing tester. This application is used to measure the coaxiality of the rotor of the bearing tester.

Description

Technical Field

[0001] The present invention belongs to the technical field of rotor coaxiality measurement, and particularly relates to a device for measuring the coaxiality of a rotor of a bearing tester. Background Art

[0002] During the bearing test process, the coaxiality between the driving motor and the test rotor part is a key factor to ensure the stable operation of the test. If the two are not coaxial, it will lead to a series of problems such as large test vibration, abnormal loads on the bearings, and fractures at the coupling connection. Existing testers usually use a laser alignment instrument to check the coaxiality after assembly. However, the laser alignment instrument has problems such as cumbersome operation, large required operation space, and inconsistent interfaces with the tester during use, and cannot cover all sizes of bearing testers, having limitations. Summary of the Invention

[0003] In order to solve the problem that when measuring the coaxiality between the driving motor and the test rotor of a bearing tester, it is necessary to rely on a laser alignment instrument, which has cumbersome operation and occupies a large space, the present invention further develops a device for measuring the coaxiality of a rotor of a bearing tester;

[0004] A device for measuring the coaxiality of a rotor of a bearing tester, the measuring device includes a fixing component, a locking pin component, a support rod, a sliding rod, and a dial indicator;

[0005] The fixing component is sleeved on the outer circumferential surface of the driving motor coupling, and the fixing component is detachably connected to the driving motor coupling. The support rod is arranged on the fixing component and extends towards the side where the bearing tester rotor is located. The support rod is arranged parallel to the axis of the driving motor coupling. One end of the support rod is detachably connected to the fixing component through the locking pin component. The other end of the support rod is provided with a sliding rod. The sliding rod is sleeved on the outer circumferential surface of the other end of the support rod, and the sliding rod is locked and fixed to the support rod through a locking nut. The other end of the sliding rod is provided with a dial indicator. The dial indicator is detachably connected to the sliding rod through a locking bolt. The contact end of the dial indicator contacts the outer circumferential surface of the bearing tester rotor;

[0006] Further, the fixing component includes an upper arc frame, a lower arc frame, and N clamping bolts, where N is a positive integer. The upper arc frame and the lower arc frame are spliced relatively up and down to form a complete annular frame body. The N clamping bolts are arranged equidistantly in the circumferential direction on the outer circumferential surface of the annular frame body, and the axis of each clamping bolt is perpendicular to the axis of the annular frame body. The threaded end of each clamping bolt passes through the annular frame body and is arranged in the inner hole part of the annular frame body. The screwing part of each clamping bolt is arranged outside the annular frame body, and each clamping bolt is threadedly connected to the annular frame body;

[0007] A connecting ear is provided at the top of the closed end of the upper arc frame. The connecting ear is integrally formed with the upper arc frame. A strip-shaped limiting hole is machined on the side wall of one side plate of the connecting ear along the thickness direction of the annular frame body. One end of the support rod is arranged in the connecting ear, the locking pin assembly is arranged in the strip-shaped limiting hole, and the support rod is detachably connected to the connecting ear through the locking pin assembly;

[0008] Further, one first connecting block is respectively provided on both sides of the open end in the upper arc frame, and each first connecting block is integrally formed with the upper arc frame. One second connecting block is respectively provided on both sides of the open end in the lower arc frame, and each second connecting block is correspondingly arranged with one first connecting block. Each second connecting block is integrally formed with the lower arc frame. One first connecting through hole is machined on each first connecting block, one second connecting through hole is machined on each second connecting block, and each first connecting through hole and each second connecting through hole are coaxially and oppositely arranged. A bolt-nut assembly is provided in each group of corresponding first connecting through holes and second connecting through holes, and the upper arc frame and the lower arc frame are detachably connected through two bolt-nut assemblies;

[0009] Further, the locking pin assembly includes a locking pin and a locking nut. External threads are machined on the outer circumferential surface of one end of the locking pin. The other end of the locking pin passes through the strip-shaped limiting hole and contacts the support rod. The locking nut is arranged outside the connecting ear, and the locking nut is sleeved on the end of the locking pin with external threads, and the locking nut is threadedly connected to the locking pin;

[0010] Further, two positioning holes are machined on the outer surface of one end of the support rod along the length extension direction of the support rod. The two positioning holes are located on a generatrix of the support rod, and the axis of each positioning hole is perpendicular to the axis of the support rod. External threads are machined on the outer circumferential surface of the other end of the support rod;

[0011] Further, an adjusting strip-shaped hole is machined on the side wall of the sliding rod along the length extension direction of the sliding rod. The sliding rod is sleeved on the support rod through the adjusting strip-shaped hole. One positioning locking nut is respectively arranged on the front and rear sides of the sliding rod, and the two positioning locking nuts are sleeved on the outer circumferential surface of the other end of the support rod. The sliding rod is detachably connected to the support rod through the two positioning locking nuts. A dial indicator mounting hole is machined on the end of the sliding rod far from the support rod, and positioning threaded holes are machined on the inner wall of the dial indicator mounting hole. The axis of the positioning threaded hole is perpendicular to the axis of the dial indicator mounting hole. The dial indicator is inserted into the dial indicator mounting hole, the positioning clamping bolt is inserted into the positioning threaded hole, and the dial indicator is detachably connected to the sliding rod through the positioning clamping bolt;

[0012] The beneficial effects of this application compared with the prior art:

[0013] A coaxiality measuring device for a bearing tester rotor proposed in this application can measure the coaxiality between the driving motor of the bearing tester and the test rotor. Compared with the existing method of measuring using a laser alignment instrument, the device provided in this application has a simpler structure and lower cost. During measurement, only a small installation space is required to achieve the measurement. Moreover, compared with measuring using a laser alignment instrument, it is also more convenient during the preliminary preparation process, without the need to establish a measurement reference and set parameters. Only the dial gauge holder needs to be installed on the coupling of the output shaft of the driving motor, and the contact point of the dial indicator is set on the outer cylindrical surface of the measured shafting. At the same time, the device described in this application has high adjustability. By adjusting the initial position of the dial indicator, the coaxiality of rotors of bearing testers with different sizes can be measured, and the measurement process is very simple and has high accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the front view schematic diagram of the measuring device described in the present invention;

[0015] Figure 2 is the side view schematic diagram of the measuring device described in the present invention;

[0016] Figure 3 is the rear view schematic diagram of the measuring device described in the present invention;

[0017] Figure 4 is the sectional view schematic diagram of the measuring device described in the present invention in the A-A direction;

[0018] Figure 5 is the working schematic diagram when using the measuring device described in the present invention;

[0019] Figure 6 is the working schematic diagram when using the measuring device described in the present invention;

[0020] Figure 7 is the working schematic diagram when using the measuring device described in the present invention;

[0021] Figure 8 is the working schematic diagram when using the measuring device described in the present invention;

[0022] In the figure, 1 is the upper arc frame, 2 is the lower arc frame, 3 is the clamping bolt, 4 is the connecting ear, 5 is the locking pin assembly, 6 is the support rod, 7 is the sliding rod, 8 is the dial indicator, 9 is the driving motor coupling, and 10 is the bearing tester rotor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] DETAILED DESCRIPTION OF THE EMBODIMENT 1: In combination with Figures 1 to 8 this embodiment is described. In this embodiment, a coaxiality measuring device for a bearing tester rotor is provided. The measuring device includes a fixing component, a locking pin assembly 5, a support rod 6, a sliding rod 7, and a dial indicator 8;

[0024] The fixed component is sleeved on the outer circumferential surface of the driving motor coupling 9, and the fixed component is detachably connected to the driving motor coupling 9. The support rod 6 is arranged on the fixed component and extends towards the side where the bearing tester rotor 10 is located. The support rod 6 is arranged parallel to the axis of the driving motor coupling 9. One end of the support rod 6 is detachably connected to the fixed component through a locking pin assembly 5. A sliding rod 7 is arranged at the other end of the support rod 6. The sliding rod 7 is sleeved on the outer circumferential surface of the other end of the support rod 6, and the sliding rod 7 is locked and fixed to the support rod 6 through a locking nut. A dial indicator 8 is arranged at the other end of the sliding rod 7. The dial indicator 8 is detachably connected to the sliding rod 7 through a locking bolt. The contact end of the dial indicator 8 contacts the outer circumferential surface of the bearing tester rotor 10.

[0025] In this embodiment, the fixed component is used to fix the dial indicator 8 on the driving motor coupling 9, and the position of the dial indicator 8 is determined by sliding the sliding rod 7 along the length direction of the support rod 6, so as to achieve the purpose of accurate measurement.

[0026] Specific Embodiment Two: Figures 1 to 8 This embodiment will be described in combination with the above. The difference between this embodiment and the first specific embodiment is that in this embodiment, the fixed component includes an upper arc frame 1, a lower arc frame 2, and N clamping bolts 3, where N is a positive integer. The upper arc frame 1 and the lower arc frame 2 are spliced up and down relatively to form a complete annular frame. The N clamping bolts 3 are arranged equidistantly along the circumferential direction on the outer circumferential surface of the annular frame, and the axis of each clamping bolt 3 is perpendicular to the axis of the annular frame. The threaded end of each clamping bolt 3 passes through the annular frame and is arranged in the inner hole part of the annular frame. The screwing part of each clamping bolt 3 is arranged outside the annular frame, and each clamping bolt 3 is threadedly connected to the annular frame;

[0027] A connecting ear 4 is arranged at the top of the closed end of the upper arc frame 1. The connecting ear 4 is integrally formed with the upper arc frame 1. A strip-shaped limiting hole is machined on the side wall of one side plate of the connecting ear 4 along the thickness direction of the annular frame. One end of the support rod 6 is arranged in the connecting ear 4. The locking pin assembly 5 is arranged in the strip-shaped limiting hole, and the support rod 6 is detachably connected to the connecting ear 4 through the locking pin assembly 5. Other compositions and connection methods are the same as those in the first specific embodiment.

[0028] In this embodiment, the fixed component is designed in a split assembly mode, which is convenient for sleeving on the driving motor coupling 9, and it is also convenient to fix the fixed component through the clamping bolts 3. The number of clamping bolts 3 should not be too many, generally 3 - 6. Within a reasonable number setting range, the operator can make an independent choice according to the actual working needs.

[0029] Specific Embodiment Three: Figures 1 to 8Describing this embodiment, the difference between this embodiment and the second specific embodiment is that in this embodiment, a first connecting block is provided on each side of the open end of the upper arc frame 1, and each first connecting block is integrally formed with the upper arc frame 1. A second connecting block is provided on each side of the open end of the lower arc frame 2, and each second connecting block is correspondingly arranged with a first connecting block. Each second connecting block is integrally formed with the lower arc frame 2. A first connecting through hole is machined on each first connecting block, and a second connecting through hole is machined on each second connecting block. Each first connecting through hole and a second connecting through hole are coaxially opposite to each other. A bolt-nut assembly is provided in each group of corresponding first connecting through holes and second connecting through holes. The upper arc frame 1 and the lower arc frame 2 are detachably connected by two bolt-nut assemblies. Other compositions and connection methods are the same as those in the second specific embodiment.

[0030] With such a setting, the advantage of connecting the upper arc frame 1 and the lower arc frame 2 through two connecting blocks is that the connecting blocks are arranged outside the arc frames where they are located, and will not affect the inside of the annular frame after the upper arc frame 1 and the lower arc frame 2 are assembled. On the premise of ensuring the stable operation of the annular frame, it is convenient for the installation and assembly of the annular frame.

[0031] Specific embodiment four: Combining Figures 1 to 8 Describing this embodiment, the difference between this embodiment and the third specific embodiment is that in this embodiment, the locking pin assembly 5 includes a locking pin and a locking nut. An external thread is machined on the outer cylindrical surface of one end of the locking pin. The other end of the locking pin passes through the strip-shaped limiting hole and contacts the support rod 6. The locking nut is arranged outside the connecting ear 4, and the locking nut is sleeved on the end of the locking pin with an external thread. The locking nut is threadedly connected to the locking pin. Other compositions and connection methods are the same as those in the third specific embodiment.

[0032] Specific embodiment five: Combining Figures 1 to 8 Describing this embodiment, the difference between this embodiment and the fourth specific embodiment is that in this embodiment, two positioning holes are machined on the outer surface of one end of the support rod 6 along the length extension direction of the support rod 6. The two positioning holes are located on a generatrix of the support rod 6, and the axis of each positioning hole is perpendicular to the axis of the support rod 6. An external thread is machined on the outer cylindrical surface of the other end of the support rod 6. Other compositions and connection methods are the same as those in the fourth specific embodiment.

[0033] With such a setting, it is convenient to position the locking pin assembly 5 by setting the positioning holes. The end of the locking pin is radially positioned by the hole wall of the positioning hole, ensuring that there is no deviation during its installation.

[0034] Specific embodiment six: Combining Figures 1 to 8Regarding this embodiment, the difference from the fifth specific embodiment is that in this embodiment, an adjustment slot is machined on the side wall of the sliding rod 7 along the length extension direction of the sliding rod 7. The sliding rod 7 is sleeved on the support rod 6 through the adjustment slot. A positioning lock nut is respectively arranged on the front and rear sides of the sliding rod 7, and the two positioning lock nuts are sleeved on the outer cylindrical surface of the other end of the support rod 6. The sliding rod 7 is detachably connected to the support rod 6 through the two positioning lock nuts. A dial indicator mounting hole is machined at one end of the sliding rod 7 away from the support rod 6, and a positioning threaded hole is machined on the inner wall of the dial indicator mounting hole. The axis of the positioning threaded hole is perpendicular to the axis of the dial indicator mounting hole. The dial indicator 8 is inserted into the dial indicator mounting hole, and the positioning clamping bolt is inserted into the positioning threaded hole. The dial indicator 8 is detachably connected to the sliding rod 7 through the positioning clamping bolt. Other compositions and connection methods are the same as those in the fifth specific embodiment.

[0035] With such a setting, the adjustment slot on the sliding rod 7 has two functions. First, the sliding rod 7 can slide along the length direction of the support rod 6 through the adjustment slot, so as to adjust the distance between the dial indicator 8 and the fixed component. Second, the sliding rod 7 can slide radially along the end face of the support rod 6 through the adjustment slot, so as to adjust the distance between the contact point of the dial indicator 8 and the outer cylindrical surface of the rotor. The function of determining the positions in two directions through one adjustment hole is realized. This design simplifies the structure of the dial gauge rack and reduces the manufacturing cost.

[0036] The present invention has been disclosed above with preferred embodiments. However, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, can make some changes or modifications to the above-disclosed structure and technical content to form equivalent embodiments of equivalent changes. However, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

[0037] Working principle:

[0038] When this application is in use, there are two cases:

[0039] First, when there is misalignment caused by a relative angle between the two axes during measurement, the measurement method is as Figures 5 to 6 shown. Rotate the fixed axis where the dial gauge base is located one week, and the maximum value of the dial indicator reading measured is a1. At this time, the axial position of the dial gauge base relative to the two axes is a2. Then move the dial gauge base, and the moving distance can be measured by scribing. After moving the dial gauge base, rotate the fixed axis where the dial gauge base is located one week, and the maximum value of the dial indicator reading measured is a3. At this time, the axial position of the dial gauge base relative to the two axes is a4. Then the included angle between the two axes is: included angle between two axes = arctan(a3 - a1) / (a4 - a2);

[0040] Second, when misalignment is caused by inconsistent height differences between the two axes during measurement, the measurement method is as shown in the figure. Rotate the fixed axis where the dial gauge base is located one full turn, and measure the maximum and minimum readings of the dial indicator, which are b1 and b2 respectively. Then the axis height difference is: Axis height difference = (b1 - b2) / 2.

Claims

1. A coaxiality measuring device for the rotor of a bearing tester, characterized in that: The measuring device includes a fixing component, a locking pin component (5), a support rod (6), a sliding rod (7), and a dial indicator (8); The fixing component is sleeved on the outer circumferential surface of the driving motor coupling (9), and the fixing component is detachably connected to the driving motor coupling (9). The support rod (6) is arranged on the fixing component and extends towards the side where the bearing tester rotor (10) is located. The support rod (6) is arranged parallel to the axis of the driving motor coupling (9). One end of the support rod (6) is detachably connected to the fixing component through the locking pin component (5). A sliding rod (7) is provided at the other end of the support rod (6). The sliding rod (7) is sleeved on the outer circumferential surface of the other end of the support rod (6), and the sliding rod (7) is locked and fixed to the support rod (6) through a locking nut. A dial indicator (8) is provided at the other end of the sliding rod (7). The dial indicator (8) is detachably connected to the sliding rod (7) through a locking bolt. The contact end of the dial indicator (8) contacts the outer circumferential surface of the bearing tester rotor (10); The fixing component includes an upper arc frame (1), a lower arc frame (2), and N clamping bolts (3), where N is a positive integer. The upper arc frame (1) and the lower arc frame (2) are spliced relatively up and down to form a complete annular frame body. The N clamping bolts (3) are arranged equidistantly along the circumferential direction on the outer circumferential surface of the annular frame body, and the axis of each clamping bolt (3) is perpendicular to the axis of the annular frame body. The threaded end of each clamping bolt (3) passes through the annular frame body and is arranged in the inner hole part of the annular frame body. The screwing part of each clamping bolt (3) is arranged outside the annular frame body, and each clamping bolt (3) is threadedly connected to the annular frame body; A connecting ear (4) is provided at the top of the closed end of the upper arc frame (1). The connecting ear (4) is integrally formed with the upper arc frame (1). A strip-shaped limiting hole is machined on the side wall of one side vertical plate of the connecting ear (4) along the thickness direction of the annular frame body. One end of the support rod (6) is arranged in the connecting ear (4). The locking pin component (5) is arranged in the strip-shaped limiting hole, and the support rod (6) is detachably connected to the connecting ear (4) through the locking pin component (5); A regulating strip-shaped hole is machined on the side wall of the sliding rod (7) along the length extension direction of the sliding rod (7). The sliding rod (7) is sleeved on the support rod (6) through the regulating strip-shaped hole. A positioning locking nut is respectively provided on the front and rear sides of the sliding rod (7). The two positioning locking nuts are sleeved on the outer circumferential surface of the other end of the support rod (6), and the sliding rod (7) is detachably connected to the support rod (6) through the two positioning locking nuts. A dial indicator mounting hole is machined at the end of the sliding rod (7) away from the support rod (6), and a positioning threaded hole is machined on the inner wall of the dial indicator mounting hole. The axis of the positioning threaded hole is perpendicular to the axis of the dial indicator mounting hole. The dial indicator (8) is inserted into the dial indicator mounting hole, and a positioning clamping bolt is inserted into the positioning threaded hole. The dial indicator (8) is detachably connected to the sliding rod (7) through the positioning clamping bolt.

2. The coaxiality measuring device for the rotor of a bearing tester according to claim 1, wherein: On both sides of the open end of the upper arc frame (1), there is a first connecting block respectively, and each first connecting block is integrally formed with the upper arc frame (1). On both sides of the open end of the lower arc frame (2), there is a second connecting block respectively, and each second connecting block is arranged corresponding to a first connecting block. Each second connecting block is integrally formed with the lower arc frame (2). A first connecting through hole is machined on each first connecting block, and a second connecting through hole is machined on each second connecting block. And each first connecting through hole and a second connecting through hole are coaxially opposite to each other. A bolt-nut assembly is arranged in each group of corresponding first connecting through holes and second connecting through holes. The upper arc frame (1) and the lower arc frame (2) are detachably connected by two bolt-nut assemblies.

3. A coaxiality measuring device for a bearing tester rotor according to claim 2, characterized in that: The locking pin assembly (5) includes a locking pin and a locking nut. An external thread is machined on the outer cylindrical surface of one end of the locking pin. The other end of the locking pin passes through the strip-shaped limiting hole and contacts the support rod (6). The locking nut is arranged outside the connecting ear (4), and the locking nut is sleeved on the end of the locking pin with the external thread, and the locking nut is threadedly connected with the locking pin.

4. A coaxiality measuring device for a bearing tester rotor according to claim 3, characterized in that: On the outer surface of one end of the support rod (6), two positioning holes are machined along the length extension direction of the support rod (6). The two positioning holes are located on a generatrix of the support rod (6), and the axis of each positioning hole is perpendicular to the axis of the support rod (6). An external thread is machined on the outer cylindrical surface of the other end of the support rod (6).

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