Reliability test method for CT machine bearing

Abstract

The invention discloses a reliability test method for a CT machine bearing. The reliability test method is based on a CT machine bearing test bench comprising a support, a bearing mounting mechanism and a bearing test mechanism. The support comprises a base and two supporting plates which are symmetrically and vertically fixed to the top faces of the two heads of the base. The bearing installation mechanism comprises a bearing installation disc, two rotating shaft installation plates which are vertically connected to the outer end face of the bearing installation disc in a central symmetry mode, a driving end shaft installed on the outer end face of one rotating shaft installation plate and a driven end shaft installed on the outer end face of the other rotating shaft installation plate. The CT machine bearing is installed on the front face of the bearing installation disc. The bearing testing mechanism comprises a bearing driving motor installed in the center of the back face of the bearing installation disc, a balance weight bottom plate installed on the front face of the inner ring of the CT machine bearing and installed on the bearing driving motor, a plurality of balance weight plates sequentially installed on the front face of the balance weight bottom plate, and an installation disc driving motor installed at the outer end of the driving end shaft. The device can meet the test requirements of the CT machine bearing.

Description

Technical Field

[0001] The invention relates to a reliability test method for a CT machine bearing. Background Art

[0002] The CT machine is mainly composed of two parts: the frame and the table. The main frame of the frame includes the rotor and the stator, which are connected by a supporting bearing. As the clinical requirements for scanning speed are getting higher and higher, the performance requirements for the main frame are also getting higher and higher. The current core performance requirements of CT machines are as follows:

[0003] (1) Higher speed, the rotor speed reaches 120rpm.

[0004] (2) Angle and position positioning accuracy: at a higher rotation speed, the frame has no obvious vibration in the horizontal rotation plane (XY axis) and the vertical rotation plane (Z axis).

[0005] (3) Low noise, the noise does not exceed 65dB at a speed of 120rpm.

[0006] (4) Long life.

[0007] Therefore, a test bench that can simulate the CT machine frame is needed to verify the various performances of the CT machine bearings. The test bench should have the following performances:

[0008] (1) The speed reaches above 120 rpm;

[0009] (2) The test bench noise is lower than 65dB under any circumstances;

[0010] (3) The test bench can be tilted by ±30°. Summary of the invention

[0011] The purpose of the present invention is to overcome the defects of the prior art and provide a reliability test method for a CT machine bearing, which can meet the reliability test requirements of a CT machine bearing.

[0012] The object of the present invention is achieved as follows: a reliability test method for a CT machine bearing is based on a test bench for a CT machine bearing, the test bench comprising a bracket, a bearing mounting mechanism, a bearing testing mechanism and an electric control box; wherein,

[0013] The bracket includes a base and two support plates symmetrically and vertically fixed on the top surfaces of the two ends of the base, and the upper parts of the two support plates are respectively provided with a coaxial shaft hole;

[0014] The bearing installation mechanism comprises a circular bearing installation plate, two rotating shaft installation plates which are vertically connected to the outer end surface of the bearing installation plate in a symmetrical manner, a driving end shaft installed on the outer end surface of one rotating shaft installation plate, and a driven end shaft which is installed on the outer end surface of the other rotating shaft installation plate and is coaxial with the driving end shaft; a motor through hole is provided at the center of the bearing installation plate, and a plurality of connecting holes which correspond to the plurality of installation holes on the outer ring end surface of the CT machine bearing are provided on the edge surface of the bearing installation plate, so that the CT machine bearing is installed on the front side of the bearing installation plate; the driving end shaft and the driven end shaft are respectively inserted into the shaft holes of the two support plates of the bracket through a bearing seat in a one-to-one correspondence;

[0015] The bearing testing mechanism comprises a bearing drive motor, a counterweight base plate, a plurality of counterweight plates and a mounting plate drive motor;

[0016] The bearing drive motor is installed at the back center of the bearing mounting plate through a reducer;

[0017] The counterweight base plate is installed on the front side of the inner ring of the CT machine bearing, and the counterweight base plate is connected to the spline shaft fixed on the reducer through a spline sleeve;

[0018] A plurality of counterweight plates are sequentially mounted on the front side of the counterweight base plate;

[0019] The mounting plate driving motor is mounted on the outer end of the driving end shaft through a rotary reducer and fixed on the outer side surface of a supporting plate;

[0020] The electric control box is installed at the lower part of the outer side surface of another support plate, and a touch screen is installed on the top surface of the electric control box through a touch screen bracket. The electric control box is electrically connected to the bearing drive motor, the mounting plate drive motor and the touch screen respectively.

[0021] The reliability test method of the CT machine bearing comprises the following steps:

[0022] Step 1: operate the touch screen first, control the installation disk drive motor to rotate through the electric control box, and drive the bearing installation disk to rotate to a horizontal state;

[0023] Step 2: Fix the outer ring of the CT machine bearing on the front side of the bearing mounting plate;

[0024] Step 3: first install the counterweight base plate on the front side of the inner ring of the CT machine bearing, and connect the counterweight base plate to the reducer through the spline shaft and the spline shaft sleeve, and then increase the number of counterweight plates installed on the counterweight base plate according to the test requirements;

[0025] Step 4: operate the touch screen to control the installation disk drive motor to rotate through the electric control box, and drive the bearing installation disk to rotate to a vertical state or a state of ±30° with the vertical direction;

[0026] Step five, operate the touch screen to control the bearing drive motor to rotate through the electrical control box, so that the inner ring of the CT machine bearing rotates together with the counterweight base plate and several counterweight plates; when the inner ring of the CT machine bearing rotates together with the counterweight base plate and several counterweight plates, observe whether the CT machine bearing has obvious noise, and at the same time observe whether the test bench of the CT machine bearing has obvious vibration.

[0027] The above-mentioned reliability test method for CT machine bearings, wherein the base of the bracket includes two main crossbeams, two main longitudinal beams connected at both ends of the two main crossbeams, a plurality of longitudinal reinforcing ribs spanning between the middle parts of the two main crossbeams, two planar mounting plates correspondingly mounted on the top surfaces of the two main longitudinal beams, and four horizontal adjustment feet correspondingly mounted on the bottom surfaces of the two ends of the two main crossbeams.

[0028] In the above-mentioned reliability test method for CT machine bearings, two side reinforcing rib plates and one middle reinforcing rib plate are respectively fixed between the inner side surfaces of the two support plates of the bracket and the top surface of the base; and two side reinforcing rib plates are respectively fixed between the outer side surfaces of the two support plates and the top surface of the base.

[0029] In the above reliability test method for CT machine bearings, a plurality of weight-reducing holes are provided on the bearing mounting plate in the bearing mounting mechanism.

[0030] The above-mentioned reliability test method for CT machine bearings, wherein a front reinforcing plate is respectively connected between the upper and lower parts of the inner side surfaces of the two rotating shaft mounting plates in the bearing mounting mechanism and the front surface of the bearing mounting plate; and a back reinforcing plate is respectively fixed between the rear end surfaces of the two rotating shaft mounting plates and the back surface of the bearing mounting plate.

[0031] The reliability test method of the CT machine bearing of the present invention is characterized by:

[0032] 1. The test bench for CT machine bearings adopted in the present invention can accurately simulate the operating conditions of CT machine bearings, and realize the testing of CT machine bearings under different conditions through the bearing installation mechanism and the bearing testing mechanism, thereby providing a more accurate and stable loading load for the bearing test and meeting the reliability test requirements of CT machine bearings.

[0033] 2. The test bench for CT machine bearings used in the present invention can facilitate the disassembly and assembly of CT machine bearings, effectively reduce the operating burden of test personnel, and speed up the efficiency of batch testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a front view of the test bench of the CT machine bearing adopted by the present invention;

[0035] Figure 2 is a side view of a test bench for a machine bearing used in the present invention;

[0036] Figure 3 It is a three-dimensional diagram of a bearing mounting plate in a test bench of a CT machine bearing adopted by the present invention;

[0037] Figure 4 It is a front view of a bearing installation mechanism in a test bench for CT machine bearings used in the present invention;

[0038] Figure 5 It is a side view of the bearing installation mechanism in the test bench of the CT machine bearing adopted in the present invention (the CT machine bearing, the counterweight base plate and the counterweight plate are installed). DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the accompanying drawings.

[0040] See also Figure 1 The reliability test method of the CT machine bearing of the present invention is based on the test bench of the CT machine bearing, and the test bench of the CT machine bearing includes a bracket, a bearing installation mechanism, a bearing testing mechanism and an electric control box 4.

[0041] The bracket includes a base 1A and two support plates 1B symmetrically and vertically fixed on the top surfaces of the two ends of the base, wherein the base 1A includes two main beams 11, two main longitudinal beams 12 connected at the two ends of the two main beams 11, a plurality of longitudinal reinforcing ribs 13 spanning the middle parts of the two main beams 11, two plane mounting plates 14 mounted one-to-one on the top surfaces of the two main longitudinal beams 12, and four horizontal adjustment feet 10 mounted one-to-one on the bottom surfaces of the two ends of the two main beams 11; a coaxial axial hole is respectively provided on the upper part of the two support plates 1B; two side reinforcing rib plates 15 and a middle reinforcing rib plate 16 are respectively fixed between the inner side surfaces of the two support plates 1B and the top surface of the plane mounting plate 14 of the base 1A; two side reinforcing rib plates 15 are respectively fixed between the outer side surfaces of the two support plates 1B and the top surface of the plane mounting plate 14 of the base 1A.

[0042] The bearing installation mechanism includes a circular bearing installation disk 20, two rotating shaft installation plates 21, a driving end shaft 22A, a driven end shaft 22B and two bearing seats 23; wherein, a motor through hole is provided at the center of the bearing installation disk 20, and a plurality of weight reduction holes 202 are provided on the bearing installation disk 20 at the periphery of the motor through hole 201; a plurality of connection holes 203 corresponding to the plurality of installation holes on the outer ring end face of the CT machine bearing 5 are provided on the edge face of the bearing installation disk 20, so that the CT machine bearing 5 is installed on the front face of the bearing installation disk 20; the two rotating shaft installation plates 21 are vertically connected to the outer end face of the bearing installation disk 20 in a center-symmetrical manner, and the upper and lower parts of the inner side faces of the two rotating shaft installation plates 21 are in contact with the shaft. A front reinforcing plate 211 is connected between the front faces of the bearing mounting plates 20, and a back reinforcing plate 212 is fixed between the rear end faces of the two rotating shaft mounting plates 21 and the back faces of the bearing mounting plates 20; the driving end shaft 22A is mounted on the outer end face of one rotating shaft mounting plate 21; the driven end shaft 22B is coaxially mounted on the outer end face of the other rotating shaft mounting plate 21 with the driving end shaft 22A; the driving end shaft 22A and the driven end shaft 22B are inserted into the axial holes of the two supporting plates 1B of the bracket one by one, and the two bearing seats 23 are mounted on the outer sides of the two supporting plates 1B one by one, so that the driving end shaft 22A and the driven end shaft 22B are supported by the two bearing seats 23 one by one.

[0043] The bearing test mechanism includes a bearing drive motor 30, a counterweight base plate 31, a plurality of counterweight plates 32 and a mounting plate drive motor 33; wherein,

[0044] A reducer 31 is installed on the rotating shaft of the bearing drive motor 30, and the reducer 31 is installed at the back center of the bearing mounting plate 20;

[0045] The counterweight base plate 32 is in the shape of a disk. A plurality of connection holes corresponding to the plurality of mounting holes on the inner ring end surface of the CT machine bearing 5 are provided along a circle on the surface near the edge of the counterweight base plate 32, so that the first counterweight base plate 32 is installed on the front face of the inner ring of the CT machine bearing 5. The first counterweight base plate 32 is installed on the front face of the inner ring of the CT machine bearing. A spline sleeve 322 is fixed at the center of the surface of the counterweight base plate 32. The spline sleeve 322 is connected to a spline shaft 321 fixed on the reducer 31.

[0046] The counterweight plate 33 is also in the shape of a disc, and a plurality of connection holes corresponding to the plurality of connection holes on the counterweight bottom plate 32 are evenly distributed along a circle on the surface near the edge of each counterweight plate 33, so that a plurality of counterweight plates 33 can be sequentially mounted on the front side of the counterweight bottom plate 32;

[0047] The mounting plate driving motor 34 is mounted on the input end of the rotary reducer 35 through the mounting seat 340. The rotary reducer 35 is mounted on the outer surface of a support plate 1B through the mounting plate 350, and the output end of the rotary reducer 35 is connected to the outer end of the driving end shaft 22A of the bearing mounting mechanism; the rotary reducer 35 adopts a worm gear rotary support plate.

[0048] The electric control box 4 is mounted on the lower part of the outer side surface of another support plate 1B through four fixing columns 41. A touch screen 40 is mounted on the top surface of the electric control box 4 through a touch screen bracket 42. The electric control box 4 is electrically connected to the bearing drive motor 30, the mounting plate drive motor 33 and the touch screen 40. The bearing drive motor 30 and the mounting plate drive motor 33 are both servo motors.

[0049] The reliability test method of the CT machine bearing of the present invention comprises the following steps:

[0050] Step 1: first operate the touch screen 40 to control the installation disk drive motor 33 to rotate through the electric control box 4, and drive the bearing installation disk 20 to rotate to a horizontal state;

[0051] Step 2: Fix the outer ring of the CT machine bearing 5 to the front side of the bearing mounting plate 20 by means of bolts;

[0052] Step 3: First, the counterweight base plate 32 is installed on the front side of the inner ring of the CT machine bearing 5 by bolts, and the counterweight base plate 32 is connected to the reducer 31 through the spline shaft 321 and the spline shaft sleeve 322, and then the number of counterweight plates 33 installed on the counterweight base plate 32 is increased according to the test requirements;

[0053] Step 4: operate the touch screen 40, control the mounting plate drive motor 33 to rotate through the electric control box 4, and drive the bearing mounting plate 20 to rotate to a vertical state or a state of ±30° with the vertical direction through the reducer 31 to simulate various working conditions of the CT machine;

[0054] Step five, operate the touch screen 40, control the bearing drive motor 30 to rotate through the electric control box 4, transmit the torque to the counterweight base plate 32 through the spline shaft 321 and the spline shaft sleeve 322, so that the inner ring of the CT machine bearing 5 rotates together with the counterweight base plate 32 and the plurality of counterweight plates 33; when the inner ring of the CT machine bearing 5 rotates with the counterweight base plate 32 and the plurality of counterweight plates 32, observe whether the CT machine bearing 5 has obvious noise, and at the same time observe whether the test bench of the CT machine bearing has obvious vibration.

[0055] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the scope of the present invention and should be defined by the claims.

Claims

1. A reliability test method for CT machine bearings, based on a test bench for CT machine bearings, the test bench comprising a bracket, a bearing mounting mechanism, a bearing testing mechanism and an electric control box; The bracket includes a base and two support plates symmetrically and vertically fixed on the top surfaces of the two ends of the base, and the upper parts of the two support plates are respectively provided with a coaxial shaft hole; The bearing installation mechanism comprises a circular bearing installation plate, two rotating shaft installation plates which are vertically connected to the outer end surface of the bearing installation plate in a symmetrical manner, a driving end shaft installed on the outer end surface of one rotating shaft installation plate, and a driven end shaft which is installed on the outer end surface of the other rotating shaft installation plate and is coaxial with the driving end shaft; a motor through hole is provided at the center of the bearing installation plate, and a plurality of connecting holes which correspond to the plurality of installation holes on the outer ring end surface of the CT machine bearing are provided on the edge surface of the bearing installation plate, so that the CT machine bearing is installed on the front side of the bearing installation plate; the driving end shaft and the driven end shaft are respectively inserted into the shaft holes of the two support plates of the bracket through a bearing seat in a one-to-one correspondence; The bearing testing mechanism comprises a bearing drive motor, a counterweight base plate, a plurality of counterweight plates and a mounting plate drive motor; The bearing drive motor is installed at the back center of the bearing mounting plate through a reducer; The counterweight base plate is installed on the front side of the inner ring of the CT machine bearing, and the counterweight base plate is connected to the spline shaft fixed on the reducer through a spline sleeve; A plurality of counterweight plates are sequentially mounted on the front side of the counterweight base plate; The mounting plate driving motor is mounted on the outer end of the driving end shaft through a rotary reducer and fixed on the outer side surface of a supporting plate; The electric control box is installed at the lower part of the outer side surface of another support plate, and a touch screen is installed on the top surface of the electric control box through a touch screen bracket. The electric control box is electrically connected to the bearing drive motor, the mounting plate drive motor and the touch screen respectively. It is characterized in that The reliability test method of the CT machine bearing comprises the following steps: Step 1: operate the touch screen first, control the installation disk drive motor to rotate through the electric control box, and drive the bearing installation disk to rotate to a horizontal state; Step 2: Fix the outer ring of the CT machine bearing on the front side of the bearing mounting plate; Step 3: first install the counterweight base plate on the front side of the inner ring of the CT machine bearing, and connect the counterweight base plate to the reducer through the spline shaft and the spline shaft sleeve, and then increase the number of counterweight plates installed on the counterweight base plate according to the test requirements; Step 4: operate the touch screen to control the installation disk drive motor to rotate through the electric control box, and drive the bearing installation disk to rotate to a vertical state or a state of ±30° with the vertical direction; Step five, operate the touch screen to control the bearing drive motor to rotate through the electrical control box, so that the inner ring of the CT machine bearing rotates together with the counterweight base plate and several counterweight plates; when the inner ring of the CT machine bearing rotates together with the counterweight base plate and several counterweight plates, observe whether the CT machine bearing has obvious noise, and at the same time observe whether the test bench of the CT machine bearing has obvious vibration.

2. The reliability test method of CT machine bearing according to claim 1 is characterized in that: The base of the bracket includes two main cross beams, two main longitudinal beams connected at both ends of the two main cross beams, a plurality of longitudinal reinforcing ribs spanning the middle parts of the two main cross beams, two planar mounting plates correspondingly mounted on the top surfaces of the two main longitudinal beams, and four horizontal adjustment feet correspondingly mounted on the bottom surfaces of the two ends of the two main cross beams.

3. The reliability test method of CT machine bearing according to claim 1 is characterized in that: Two side reinforcing ribs and one middle reinforcing rib are respectively fixed between the inner side surfaces of the two support plates of the bracket and the top surface of the base; two side reinforcing ribs are respectively fixed between the outer side surfaces of the two support plates and the top surface of the base.

4. The reliability test method of CT machine bearing according to claim 1 is characterized in that: A plurality of weight-reducing holes are provided on the bearing mounting plate in the bearing mounting mechanism.

5. The reliability test method of CT machine bearing according to claim 1, characterized in that: A front reinforcing plate is respectively connected between the upper and lower parts of the inner side surfaces of the two rotating shaft mounting plates in the bearing mounting mechanism and the front surface of the bearing mounting plate; a back reinforcing plate is respectively fixed between the rear end surfaces of the two rotating shaft mounting plates and the back surface of the bearing mounting plate.

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