Running-in test device of liquid metal bearing for CT (Computed Tomography)

Abstract

The invention relates to the technical field of bearing running-in testing, in particular to a running-in testing device of a liquid metal bearing for CT. The running-in testing device comprises a running-in testing tool, the running-in testing tool comprises an outer barrel shell, a running-in testing cavity is formed in the outer barrel shell, and an opening is formed in the upper end face of the outer barrel shell; an outer barrel cover capable of sealing the opening is arranged at the opening, and the outer barrel cover is connected to the upper end face of the outer barrel shell through a plurality of connecting pieces; the bottom end face of the outer barrel shell is detachably connected with an outer barrel bottom plate through a connecting piece, the upper end face of the outer barrel bottom plate is detachably connected with an inner barrel bottom plate through a connecting piece, an inner barrel shell is arranged above the inner barrel bottom plate, the inner barrel shell is located in the center of the running-in test cavity, and the outer ring of the inner barrel shell is sleeved with a stator coil. The liquid metal bearing running-in testing device can be suitable for running-in testing of the liquid metal bearing in a CT bulb tube, working performance parameters of the liquid metal bearing can be accurately obtained in time, and therefore the working reliability of the liquid metal bearing is verified.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing running-in testing, and in particular to a running-in testing device for a liquid metal bearing used in a CT scanner. Background Art

[0002] The main function of a bearing is to support the rotation of a shaft-like part. The main quality indicators of a bearing include the limiting speed of the bearing, the rated load of the bearing, and the relationship between the rotational speed and temperature rise of the bearing is: when the rotational speed increases, the bearing will heat up and the temperature will rise. The higher the rotational speed, the higher the temperature rise. In order to obtain the performance parameters of the bearing working state, it is necessary to conduct a running-in test on the bearing.

[0003] Currently, due to the excellent heat dissipation performance of liquid metal bearings, liquid metal bearings are widely used in CT tubes. In the prior art, common bearing running-in testing devices are mainly for ball bearings. Since the structures of the liquid metal bearings in CT tubes and ball bearings are quite different, common ball bearing running-in testing devices cannot be applied to the running-in testing of liquid metal bearings in CT tubes. Summary of the Invention

[0004] The present application aims at the above-mentioned shortcomings in the existing production technology, and provides a running-in testing device for a liquid metal bearing used in a CT scanner, which can be applicable to the running-in testing of liquid metal bearings in CT tubes, timely and accurately obtain the working performance parameters of the liquid metal bearings, and thus verify the working reliability of the liquid metal bearings.

[0005] The technical solution adopted by the present invention is as follows: A running-in testing device for a liquid metal bearing used in a CT scanner, comprising a running-in testing tooling. The running-in testing tooling includes an outer barrel housing. A running-in testing cavity is arranged inside the outer barrel housing, and an opening is arranged on the upper end surface of the outer barrel housing. An outer barrel cover capable of closing the opening is arranged at the opening, and the outer barrel cover is connected to the upper end surface of the outer barrel housing through a plurality of connecting members. The bottom end surface of the outer barrel housing is detachably connected to an outer barrel bottom plate through a connecting member, and the upper end surface of the outer barrel bottom plate is detachably connected to an inner barrel bottom plate through a connecting member. An inner barrel housing is arranged above the inner barrel bottom plate. The inner barrel housing is located at the center of the running-in testing cavity. A stator coil is sleeved outside the inner barrel housing. The inner cavity of the housing of the inner barrel housing is used to accommodate the rotor end of the liquid metal bearing. A bearing fixing seat is arranged directly above the inner barrel housing. The bearing fixing seat is used to clamp and fix the non-rotor end of the liquid metal bearing. The bearing fixing seat is detachably connected to the center position of the lower end surface of the outer barrel cover through a connecting member.

[0006] Further, it further includes a support structure for supporting and connecting the running-in test tooling. The support structure includes a fixed bracket. A speed reducer is fixed on the upper side surface of the fixed bracket. The input end of the speed reducer is connected to the center of the adjusting handwheel through a keyway. The output end of the speed reducer is connected to one end of a sleeve. The sleeve is connected to a bearing seat through a bearing. The bearing seat is detachably connected to the fixed bracket through a connecting member. The other end of the sleeve is detachably connected to the side surface of the outer barrel bottom plate through a connecting member.

[0007] Further, a stator connecting wire is connected to the stator coil. One end of the stator connecting wire extends downward from the bottom end surface of the inner barrel bottom plate. A sealing glue is coated at the position where the stator connecting wire extends from the bottom end surface of the inner barrel bottom plate to form a third sealing structure. The third sealing structure wraps the stator connecting wire to form a seal.

[0008] Further, a stator support seat is arranged on the upper end surface of the inner barrel bottom plate. The stator support seat and the inner barrel bottom plate are integrally formed. The stator support seat is used for positioning and supporting the lower part of the stator coil.

[0009] Further, a cooling structure is arranged on the outer circle of the inner barrel housing. The cooling structure includes a cooling housing sleeved on the outer circle of the inner barrel housing. The inner surface of the upper part of the cooling housing is welded to the outer surface of the inner barrel housing. The lower end surface of the cooling housing is detachably connected to the upper end surface of the inner barrel bottom plate through a connecting member. A cooling cavity is formed between the cooling housing and the inner barrel housing. An oil inlet and an oil outlet are respectively arranged on the inner barrel bottom plate. The oil inlet and the oil outlet are respectively communicated with the cooling cavity.

[0010] Further, an isolation pad is arranged on the upper end surface of the stator coil. The upper end surface of the isolation pad is in contact with the inner end surface of the upper part of the cooling housing. The isolation pad can insulate the stator coil and the cooling housing from each other.

[0011] Further, a three-way joint is arranged on the outer barrel cover. The first interface of the three-way joint is connected to the running-in test cavity. The second interface of the three-way joint is connected to a vacuum pump. The third interface of the three-way joint is connected to a vacuum gauge.

[0012] Further, a photoelectric sensor is arranged in the running-in test cavity. One end of the photoelectric sensor extends out of the outer barrel cover. The other end of the photoelectric sensor extends to the position of the liquid metal bearing. A sealing glue is coated between the outer barrel cover and the extending end of the photoelectric sensor to form a first sealing structure. The first sealing structure wraps the extending end of the photoelectric sensor to form a seal.

[0013] Further, a temperature sensor is arranged in the running-in test cavity. One end of the temperature sensor can contact the liquid metal bearing to be tested. The other end of the temperature sensor extends out of the outer barrel cover. A sealing glue is coated between the outer barrel cover and the extending end of the temperature sensor to form a second sealing structure. The second sealing structure wraps the extending end of the temperature sensor to form a seal.

[0014] The beneficial effects of the present invention are as follows: The present invention can be applied to the running-in test of the liquid metal bearing in the CT tube. Through the present invention, the working performance parameters of the liquid metal bearing can be obtained timely and accurately, so as to verify the working reliability of the liquid metal bearing; through the present invention, the operation risks of the liquid metal bearing can be exposed in advance, providing guarantee for the normal operation of the liquid metal bearing after it is installed in the CT tube; the support structure of the present invention is connected to the running-in test tooling through a speed reducer, and can realize the running-in test of the liquid metal bearing in different directions, so as to simulate the actual working conditions of the liquid metal bearing and meet different test requirements; the present invention is provided with a cooling structure on the outer ring of the stator coil, which can timely dissipate the heat generated during the operation of the stator coil, improving the reliability of the long-term operation of the device; the present invention is provided with a vacuum pumping assembly, which can provide a vacuum environment inside the running-in test tooling, solving the problem that the liquid metal bearing is easily oxidized; the present invention monitors various parameters of the liquid metal bearing in real time through temperature sensors and photoelectric sensors, so as to verify the working reliability of the liquid metal bearing from multiple dimensions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional view of the present invention.

[0016] Figure 2 It is a half-sectional view of the speed reducer installation structure of the present invention.

[0017] Figure 3 It is a three-dimensional view of the running-in test tooling of the present invention.

[0018] Figure 4 It is a half-sectional view of the running-in test tooling of the present invention.

[0019] Figure 5 It is a schematic structural diagram of the running-in test tooling of the present invention for installing the liquid metal bearing.

[0020] Wherein: 1, bottom plate; 2, side plate; 3, speed reducer; 4, adjusting handwheel; 5, bearing seat; 6, sleeve; 7, outer barrel bottom plate; 8, outer barrel housing; 9, outer barrel cover; 10, three-way joint; 11, photoelectric sensor; 12, first sealing structure; 13, temperature sensor; 14, second sealing structure; 15, stator connecting wire; 16, third sealing structure; 17, bearing fixing seat; 18, first sealing strip; 19, cooling housing; 20, inner barrel housing; 21, isolation pad; 22, stator coil; 23, stator support seat; 24, second sealing strip; 25, third sealing strip; 26, fourth sealing strip; 27, oil inlet; 28, oil outlet; 29, inner barrel bottom plate. DETAILED DESCRIPTION OF THE INVENTION

[0021] The following will describe the specific embodiments of the present invention with reference to the drawings.

[0022] As Figure 1As shown in the figure, a running-in test device for a liquid metal bearing used in a CT includes a running-in test tooling for fixing the liquid metal bearing and a support structure for supporting and connecting the running-in test tooling.

[0023] As Figure 1 and Figure 2 shown in the figure, the support structure includes a fixed bracket. A speed reducer 3 is fixed on the upper side of the fixed bracket. The input end of the speed reducer 3 is connected to the center of an adjusting handwheel 4 through a keyway. An operator can manually drive the adjusting handwheel 4 to rotate, thereby driving the speed reducer 3 to rotate. The output end of the speed reducer 3 is connected to one end of a sleeve 6. The sleeve 6 is connected to a bearing seat 5 through a bearing. The bearing seat 5 is detachably connected to the fixed bracket through bolts. The other end of the sleeve 6 is detachably connected to the running-in test tooling through bolts. The output end of the speed reducer 3 can drive the sleeve 6 to rotate, and the sleeve 6 can drive the running-in test tooling to rotate and adjust the angle. The support structure of the present invention connects the running-in test tooling through the speed reducer 3, can realize the running-in test of the liquid metal bearing in different directions, thereby simulating the actual working conditions of the liquid metal bearing, and can meet different test requirements.

[0024] As Figure 1 shown in the figure, the fixed bracket includes a horizontally arranged bottom plate 1. One end of the bottom plate 1 is fixedly connected to a vertically arranged side plate 2. The side plate 2 is used for fixing the speed reducer 3.

[0025] As Figure 3 and Figure 4 shown in the figure, the running-in test tooling includes an outer barrel housing 8 with a cylindrical structure. The bottom end surface of the outer barrel housing 8 is detachably connected to an outer barrel bottom plate 7 through bolts. The side surface of the outer barrel bottom plate 7 is detachably connected to the sleeve 6 through bolts. A running-in test cavity is arranged inside the outer barrel housing 8. An opening is arranged on the upper end surface of the outer barrel housing 8. The liquid metal bearing A is loaded into the running-in test cavity through the opening. An outer barrel cover 9 capable of closing the opening is arranged at the opening. The outer barrel cover 9 is connected to the upper end surface of the outer barrel housing 8 through a plurality of bolts.

[0026] As Figure 4 shown in the figure, a first sealing groove is arranged along the circumferential direction on the top end surface of the outer barrel housing 8. A first sealing strip 18 is arranged in the first sealing groove. The first sealing strip 18 is in sealing contact with the lower end surface of the outer barrel cover 9.

[0027] As Figure 4 shown in the figure, a second sealing groove is arranged along the circumferential direction on the bottom end surface of the outer barrel housing 8. A second sealing strip 24 is arranged in the second sealing groove. The second sealing strip 24 is in sealing contact with the upper end surface of the outer barrel bottom plate 7.

[0028] As Figure 4As shown in the figure, the upper end surface of the outer barrel bottom plate 7 is detachably connected to the inner barrel bottom plate 29 by bolts. An inner barrel housing 20 is arranged above the inner barrel bottom plate 29, and the inner barrel housing 20 is located at the central position of the running-in test cavity. A stator coil 22 is sleeved outside the inner barrel housing 20, and the inner cavity of the housing of the inner barrel housing 20 is used to accommodate the lower part of the liquid metal bearing A. A bearing fixing seat 17 is arranged directly above the inner barrel housing 20. The bearing fixing seat 17 is used to clamp and fix the non-rotor end of the liquid metal bearing. The bearing fixing seat 17 is detachably connected to the central position of the lower end surface of the outer barrel cover 9 by bolts.

[0029] As Figure 4 shown, a third sealing groove is arranged along the circumferential direction on the lower end surface of the inner barrel bottom plate 29. A third sealing strip 25 is arranged in the third sealing groove, and the third sealing strip 25 is in sealing contact with the upper end surface of the outer barrel bottom plate 7.

[0030] As Figure 5 shown, during the running-in test, the rotor end of the liquid metal bearing A extends into the inner cavity of the housing of the inner barrel housing 20, and the non-rotor end of the liquid metal bearing A is clamped and fixed in the bearing fixing seat 17. When the stator coil 22 is energized, the rotor part of the liquid metal bearing A can rotate.

[0031] As Figure 4 shown, a stator connecting wire 15 is connected to the stator coil 22, and one end of the stator connecting wire 15 extends downward out of the bottom end surface of the inner barrel bottom plate 29. A sealing glue is coated at the position where the stator connecting wire 15 extends out of the bottom end surface of the inner barrel bottom plate 29 to form a third sealing structure 16. The third sealing structure 16 wraps the stator connecting wire 15 to form a seal.

[0032] As Figure 4 shown, a stator support seat 23 is arranged on the upper end surface of the inner barrel bottom plate 29. The stator support seat 23 is integrally formed with the inner barrel bottom plate 29, and the stator support seat 23 is used to position and support the lower part of the stator coil 22.

[0033] As Figure 4 shown, a cooling structure is arranged outside the inner barrel housing 20. The cooling structure includes a cooling housing 19 sleeved outside the inner barrel housing 20. The inner surface of the upper part of the cooling housing 19 is welded to the outer surface of the inner barrel housing 20. The lower end surface of the cooling housing 19 is detachably connected to the upper end surface of the inner barrel bottom plate 29 by bolts. A cooling cavity is formed between the cooling housing 19 and the inner barrel housing 20. An oil inlet 27 and an oil outlet 28 are respectively arranged on the inner barrel bottom plate 29. The oil inlet 27 and the oil outlet 28 are respectively communicated with the cooling cavity. The oil inlet 27 is located inside the stator coil 22, and the oil outlet 28 is located outside the stator coil 22. During the running-in test, an external oil pump is connected to the oil inlet 27. The external oil pump pumps the cooling insulating oil into the cooling cavity. The cooling insulating oil exchanges heat with the stator coil 22, and the heat-exchanged insulating oil is discharged in time through the oil outlet 28, taking away the heat of the stator coil 22 in time.

[0034] As Figure 4 shown, an isolation pad 21 is provided on the upper end surface of the stator coil 22. The upper end surface of the isolation pad 21 is in contact with the inner end surface of the upper part of the cooling housing 19. The isolation pad 21 can insulate the stator coil 22 from the cooling housing 19.

[0035] As Figure 4 shown, a fourth sealing groove is provided along the circumferential direction on the lower end surface of the cooling housing 19. A fourth sealing strip 26 is provided in the fourth sealing groove. The fourth sealing strip 26 is in sealing contact with the upper end surface of the inner barrel bottom plate 29.

[0036] As Figure 4 shown, a three-way joint 10 is provided on the outer barrel cover 9. The first interface of the three-way joint 10 is connected to the running-in test chamber. The second interface of the three-way joint 10 is connected to a vacuum pump. The third interface of the three-way joint 10 is connected to a vacuum gauge. During the running-in test, the vacuum pump can evacuate the running-in test chamber to a high vacuum state, and the vacuum gauge can monitor the internal vacuum degree of the running-in test chamber in real time.

[0037] As Figure 4 shown, a photoelectric sensor 11 is provided in the running-in test chamber. One end of the photoelectric sensor 11 extends out of the outer barrel cover 9, and the other end of the photoelectric sensor 11 extends to the position of the liquid metal bearing A. A sealing glue is coated between the outer barrel cover 9 and the extending end of the photoelectric sensor 11 to form a first sealing structure 12. The first sealing structure 12 wraps the extending end of the photoelectric sensor 11 to form a seal. During the running-in test, the photoelectric sensor 11 combined with the upper computer can monitor the rotation speed and current value of the liquid metal bearing A to be tested in real time. According to the test situation, the performance of the liquid metal bearing A to be tested is evaluated multi-dimensionally.

[0038] As Figure 4 shown, a temperature sensor 13 is provided in the running-in test chamber. One end of the temperature sensor 13 can contact the liquid metal bearing A to be tested, and the other end of the temperature sensor 13 extends out of the outer barrel cover 9. A sealing glue is coated between the outer barrel cover 9 and the extending end of the temperature sensor 13 to form a second sealing structure 14. The second sealing structure 14 wraps the extending end of the temperature sensor 13 to form a seal. The temperature sensor 13 can monitor the temperature change of the liquid metal bearing to be tested in real time.

[0039] The working process of the present invention during the bearing running-in test is as follows: The non-rotor end of the liquid metal bearing A to be tested is reliably fixed through the bearing fixing seat 17, and the rotor end of the liquid metal bearing A extends into the inner barrel housing 20. Then, the operator rotates the speed reducer 3 by adjusting the handwheel 4, and uses the speed reducer 3 to rotate the running-in test tooling to the required specific angle (-180° to 180°). The rotation speed, test duration, etc. required for this test are set through the host computer software. The three-way joint 10 is connected to an external vacuum pump group and evacuated to a high vacuum state. The oil inlet 27 is connected to an external oil pump to fill the oil cooling system chamber with insulating oil, and at the same time, the heat-exchanged insulating oil flows out through the oil outlet 28, thereby forming an insulating oil circulation path to timely take away the heat generated by the stator. The stator coil 22 is energized to drive the rotor of the sub-component of the liquid metal bearing A to be tested to rotate, realizing the running-in rotation of the liquid metal bearing A to be tested. During the test, the temperature sensor 13 monitors the temperature change of the bearing to be tested in real time. The photoelectric sensor 11, combined with the host computer, can monitor the rotation speed and current value of the bearing 28 to be tested in real time. According to the test situation, the performance of the bearing to be tested is evaluated in multiple dimensions.

[0040] The above description is an explanation of the present invention, not a limitation of the invention. The scope defined by the present invention is referred to the claims. Any form of modification can be made within the protection scope of the present invention.

Claims

1. A running-in test device for a liquid metal bearing used in a CT, comprising a running-in test tooling, characterized in that: The running-in test tooling includes an outer barrel housing (8). A running-in test cavity is arranged inside the outer barrel housing (8), and an opening is provided on the upper end face of the outer barrel housing (8). An outer barrel cover (9) capable of closing the opening is arranged at the opening, and the outer barrel cover (9) is connected to the upper end face of the outer barrel housing (8) through a plurality of connecting pieces. The bottom end face of the outer barrel housing (8) is detachably connected to an outer barrel bottom plate (7) through a connecting piece, and the upper end face of the outer barrel bottom plate (7) is detachably connected to an inner barrel bottom plate (29) through a connecting piece. An inner barrel housing (20) is arranged above the inner barrel bottom plate (29). The inner barrel housing (20) is located at the central position of the running-in test cavity. A stator coil (22) is sleeved outside the inner barrel housing (20). The inner cavity of the housing of the inner barrel housing (20) is used to accommodate the rotor end of the liquid metal bearing. A bearing fixing seat (17) is arranged directly above the inner barrel housing (20). The bearing fixing seat (17) is used to clamp and fix the non-rotor end of the liquid metal bearing. The bearing fixing seat (17) is detachably connected to the central position of the lower end face of the outer barrel cover (9) through a connecting piece. It further includes a support structure for supporting and connecting the running-in test tooling. The support structure includes a fixed bracket. A speed reducer (3) is fixed on the upper side of the fixed bracket. The input end of the speed reducer (3) is connected to the center of an adjusting handwheel (4) through a keyway. The output end of the speed reducer (3) is connected to one end of a sleeve (6). The sleeve (6) is connected to a bearing seat (5) through a bearing. The bearing seat (5) is detachably connected to the fixed bracket through a connecting piece. The other end of the sleeve (6) is detachably connected to the side face of the outer barrel bottom plate (7).

2. The running-in test device for a liquid metal bearing used in a CT as described in claim 1, wherein: A stator connecting wire (15) is connected to the stator coil (22). One end of the stator connecting wire (15) extends downward out of the bottom end face of the inner barrel bottom plate (29). A sealing glue is coated at the position where the stator connecting wire (15) extends out of the bottom end face of the inner barrel bottom plate (29) to form a third sealing structure (16). The third sealing structure (16) wraps the stator connecting wire (15) inside to form a seal.

3. The running-in test device for a liquid metal bearing used in a CT according to claim 2, characterized in that: A stator support seat (23) is arranged on the upper end face of the inner barrel bottom plate (29). The stator support seat (23) and the inner barrel bottom plate (29) are integrally formed. The stator support seat (23) is used to position and support the lower part of the stator coil (22).

4. The running-in test device for a liquid metal bearing used in a CT according to claim 3, characterized in that: A cooling structure is arranged on the outer circle of the inner barrel housing (20). The cooling structure includes a cooling housing (19) sleeved on the outer circle of the inner barrel housing (20). The inner surface of the upper part of the cooling housing (19) is welded to the outer surface of the inner barrel housing (20). The lower end face of the cooling housing (19) is detachably connected to the upper end face of the inner barrel bottom plate (29) through a connecting piece. A cooling cavity is formed between the cooling housing (19) and the inner barrel housing (20). An oil inlet (27) and an oil outlet (28) are respectively arranged on the inner barrel bottom plate (29). The oil inlet (27) and the oil outlet (28) are respectively communicated with the cooling cavity.

5. The running-in test device for a liquid metal bearing used in a CT as described in claim 4, characterized in that: An isolation pad (21) is arranged on the upper end face of the stator coil (22). The upper end face of the isolation pad (21) is in contact with the inner end face of the upper part of the cooling housing (19). The isolation pad (21) can insulate the stator coil (22) from the cooling housing (19).

6. The running-in test device for a liquid metal bearing used in a CT according to claim 5, characterized in that: A three-way joint (10) is provided on the outer barrel cover (9). The first interface of the three-way joint (10) is connected to the running-in test chamber, the second interface of the three-way joint (10) is connected to a vacuum pump, and the third interface of the three-way joint (10) is connected to a vacuum gauge.

7. The running-in test device for a liquid metal bearing used in a CT according to claim 6, wherein: An optoelectronic sensor (11) is provided in the running-in test chamber. One end of the optoelectronic sensor (11) extends out of the outer barrel cover (9), and the other end of the optoelectronic sensor (11) extends to the position of the liquid metal bearing. Sealing glue is coated between the outer barrel cover (9) and the extending end of the optoelectronic sensor (11) to form a first sealing structure (12), and the first sealing structure (12) wraps the extending end of the optoelectronic sensor (11) to form a seal.

8. The running-in test device for a liquid metal bearing used in a CT according to claim 7, wherein: A temperature sensor (13) is provided in the running-in test chamber. One end of the temperature sensor (13) can contact the liquid metal bearing to be tested, and the other end of the temperature sensor (13) extends out of the outer barrel cover (9). Sealing glue is coated between the outer barrel cover (9) and the extending end of the temperature sensor (13) to form a second sealing structure (14), and the second sealing structure (14) wraps the extending end of the temperature sensor (13) to form a seal.

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