Bearing wear testing machine and detection method thereof

Abstract

The invention relates to the technical field of bearing wear tests, in particular to a bearing wear testing machine and a detection method thereof. A bearing wear testing machine comprises a rack and a shield pump, a bearing positioning seat is arranged in the rack, the shield pump is vertically arranged above the bearing positioning seat, a constant thrust device is connected above the shield pump, and the bearing positioning seat comprises a lower connecting seat, a lower bearing seat, a bearing to be tested and a set screw. The constant-force thrust device comprises an upper connecting seat, an oil seal part, a thrust bearing, a thrust bearing seat, a pressure sensor and a cushion block, the thrust bearing seat is arranged below the upper connecting seat, the cushion block and the pressure sensor are arranged between the thrust bearing seat and the upper connecting seat, and the thrust bearing is arranged below the thrust bearing seat. Compared with the prior art, the sliding bearing is tested under actual working conditions, parameters of bearing force, abrasion and time of the sliding bearing are recorded, a curve of production time and displacement and test data are reliable and real, and therefore the service life of the sliding bearing is calculated.

Description

Technical Field

[0001] The invention relates to the technical field of bearing wear testing, in particular to a bearing wear testing machine and a detection method thereof. Background Art

[0002] Sliding bearings are used in various occasions in industry, especially in high-speed rotating motor devices. Sliding bearings will bear large axial forces, causing continuous wear of the end faces of sliding bearings, affecting the life of bearings. Bearings are related to the performance and life of the entire equipment. Existing sliding bearing wear machines usually test sliding bearings under non-actual working conditions, which have the following problems: they cannot simulate the actual working conditions of sliding bearings, the test data is unreliable, and there is a lack of data on the actual working conditions of the sliding shaft. Sliding bearings are face-to-face wear, and the wear is affected by direct rigid axial force, which will be affected by direct rigid axial force and processing accuracy, resulting in the friction surface not being able to fully contact, and the detection accuracy cannot be guaranteed. Summary of the invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a bearing wear testing machine and a detection method thereof. By placing a sliding bearing in a shielded pump for testing under actual working conditions, the relationship between the bearing force, wear and time of the sliding bearing is studied, thereby predicting the service life of the sliding bearing under actual working conditions.

[0004] To achieve the above-mentioned purpose, a bearing wear testing machine is designed, including a frame and a shielded pump. A bearing locating seat is arranged inside the frame, a shielded pump is vertically arranged above the bearing locating seat, a constant thrust device is connected above the shielded pump, the bearing locating seat includes a lower connecting seat, a lower bearing seat, a bearing to be tested, and a fixing screw. The upper end of the lower bearing seat is connected to the lower end of the lower connecting seat, the upper end of the lower connecting seat is threadedly connected to the shielded pump, the bearing to be tested is embedded in the lower bearing seat and locked by the fixing screw, the constant thrust device includes an upper connecting seat, an oil seal, a thrust bearing, a thrust bearing seat, a pressure sensor, and a cushion block. A thrust bearing seat is arranged below the upper connecting seat, a cushion block and a pressure sensor are arranged between the thrust bearing seat and the upper connecting seat, a thrust bearing is arranged below the thrust bearing seat, and an oil seal is arranged at the bottom end of the thrust bearing.

[0005] The shielded pump comprises a motor stator and a motor rotor. The motor stator is surrounded by the outside of the motor rotor. The motor stator comprises a lower end plate, a stator winding, a junction box, a stator shielding sleeve, a cylinder, an upper bearing, an upper end plate, an upper bearing seat, and a mechanical seal. The lower end plate is threadedly connected to the lower connecting seat. A cylinder is provided above the lower end plate, a junction box is provided on the side of the cylinder, a stator shielding sleeve is provided inside the cylinder, a stator winding is provided in the gap between the stator shielding sleeve and the cylinder, an upper end plate and an upper bearing seat are provided above the cylinder in sequence, an upper bearing is embedded in the lower part of the upper bearing seat, and the upper part of the upper bearing seat is sealed by a mechanical seal.

[0006] The motor rotor comprises a shaft, a cast aluminum rotor, a rotor shielding sleeve, an upper thrust plate, an upper shaft sleeve, a retaining spring, a lower shaft sleeve, a positioning screw, and a lower thrust plate. The middle section of the shaft is sleeved with the cast aluminum rotor, and the outer side of the cast aluminum rotor is sleeved with the rotor shielding sleeve. The upper end of the shaft is sleeved with the retaining spring, the upper shaft sleeve, and the upper thrust plate in sequence from top to bottom, and the lower end of the shaft is sleeved with the lower shaft sleeve and the lower thrust plate in sequence from bottom to top.

[0007] The upper end of the shaft is inserted into the thrust bearing of the constant force thrust device, and the lower end of the shaft is inserted into the bearing to be tested of the bearing positioning seat and is positioned by the side positioning screw and locked by the stop screw.

[0008] An electric control box is arranged inside the frame, and a servo electric cylinder is connected above the constant thrust device.

[0009] The frame is connected with the lower bearing seat and the lower connecting seat in sequence through screws.

[0010] The bottom of the frame is provided with a through hole, and the through hole at the bottom of the frame, the gap between the bearing to be tested and the lower sleeve, the gap between the rotor shielding sleeve and the stator shielding sleeve, and the gap between the upper bearing and the upper sleeve form a cooling circulation water path.

[0011] A detection method for a bearing wear testing machine includes the following steps: S1: Start the servo electric cylinder, and manually input the constant pressure provided by the servo electric cylinder to the constant thrust device on the touch screen outside the electric control box. S2: Start the external circulating water pump, and the cooling circulating water circuit starts to work. S3: Start the shielded motor, and the motor rotor rotates at high speed under the action of the motor stator. S4: The pressure sensor measures the pressure value of the servo electric cylinder in real time. If the pressure value drops, the shaft in the motor rotor will be pressed down as a whole, and the servo electric cylinder records the displacement. S5: Generate a wear speed curve based on the wear amount and wear time data, display the data and the wear speed curve on the touch screen, and calculate the wear resistance life of the bearing. S6: Shut down, first turn off the shielded motor, then turn off the circulating water pump, and finally lift and reset the electric cylinder.

[0012] The bearing wear resistance formula is: , ɑ is the original parameter of the friction surface, U is the wear amount at a certain moment, and r is the wear speed.

[0013] The original parameters of the friction surface , t is the wear time, U is the wear amount at a certain moment, r is the wear speed, and the probability density function of the wear speed r is , is the mean value of r, S r is the standard deviation of r.

[0014] Compared with the prior art, the present invention tests the sliding bearing under actual working conditions, records the bearing capacity, wear and time parameters of the sliding bearing, produces a curve of time and displacement, and the test data is reliable and true, thereby calculating the service life of the sliding bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is an overall cross-sectional view of the present invention.

[0016] Figure 2 This is a cross-sectional view of the stator of the shielded pump motor.

[0017] Figure 3 This is a cross-sectional view of the shielded pump motor rotor.

[0018] Figure 4 This is a cross-sectional view of the thrust device.

[0019] Figure 5 This is a partial enlarged view of the bearing to be tested.

[0020] Figure 6 It is the flow channel of the cooling circulation water circuit.

[0021] Figure 7 This is the curve of wear amount and wear time.

[0022] See also Figures 1 to 7 , 1 is the frame, 2 is the motor stator, 21 is the lower end plate, 22 is the stator winding, 23 is the terminal box, 24 is the stator shielding sleeve, 25 is the cylinder, 26 is the upper bearing, 27 is the upper end plate, 28 is the upper bearing seat, 29 is the mechanical seal, 3 is the motor rotor, 31 is the shaft, 32 is the cast aluminum rotor, 33 is the rotor shielding sleeve, 34 is the upper thrust plate, 35 is the upper sleeve, 36 is the retaining spring, 37 is the lower sleeve, 38 is the positioning screw, 39 is the lower thrust plate, 4 is the constant thrust device, 41 is the upper connecting seat , 42 is an oil seal, 43 is a thrust bearing, 44 is a thrust bearing seat, 45 is a pressure sensor, 46 is a gasket, 47 is a servo electric cylinder, 5 is a bearing locating seat, 51 is a lower connecting seat, 52 is a stop screw, 53 is a lower bearing seat, 54 is a bearing to be tested, 55 is a set screw, 6 is a cooling circulation water circuit, 7 is an electric control box, Curve 1 is the wear speed curve under a load condition of 0.5KN, Curve 2 is the wear speed curve under a load condition of 1KN, and Curve 3 is the wear speed curve under a load condition of 2KN. DETAILED DESCRIPTION

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] like Figures 1 to 7 As shown, a bearing locating seat 5 is provided inside the frame 1, a shielded pump is vertically provided above the bearing locating seat 5, and a constant thrust device 4 is connected above the shielded pump. Figure 5As shown, the bearing locating seat 5 includes a lower connecting seat 51, a lower bearing seat 53, a bearing to be tested 54, and a set screw 55. The upper end of the lower bearing seat 53 is connected to the lower end of the lower connecting seat 51, and the upper end of the lower connecting seat 51 is threadedly connected to the shielded pump. The bearing to be tested 54 is embedded in the lower bearing seat 53 and locked by the set screw 55. The upper end surface of the bearing to be tested 54 will be continuously worn, such as Figure 4 As shown, the constant thrust device 4 includes an upper connecting seat 41, an oil seal 42, a thrust bearing 43, a thrust bearing seat 44, a pressure sensor 45, and a cushion block 46. A thrust bearing seat 44 is provided below the upper connecting seat 41, and a cushion block 46 and a pressure sensor 45 are provided between the thrust bearing seat 44 and the upper connecting seat 41. A thrust bearing 43 is provided below the thrust bearing seat 44. A servo electric cylinder 47 is connected above the constant thrust device 4. When the servo electric cylinder 47 is operating, force acts on the thrust bearing 43 and is transmitted through the constant thrust device 4. The force also acts on the motor rotor 3, and the motor rotor 3 transmits the force to the bearing to be tested 54. The pressure sensor 45 measures the force of the servo electric cylinder 47 to ensure the constancy of the output of the servo electric cylinder 47. To prevent damage, lubricating oil is generally applied to the thrust bearing 43. To avoid leakage of the lubricating oil in the thrust bearing 43, an oil seal 42 is provided at the bottom of the thrust bearing 43 for sealing.

[0025] The canned motor pump comprises a motor stator 2 and a motor rotor 3. Figure 2 As shown, the motor stator 2 is surrounded by the outside of the motor rotor 3. The motor stator 2 includes a lower end plate 21, a stator winding 22, a terminal box 23, a stator shielding sleeve 24, a cylinder 25, an upper bearing 26, an upper end plate 27, an upper bearing seat 28, and a mechanical seal 29. The lower end plate 21 is threadedly connected to the lower connecting seat 51. A cylinder 25 is provided above the lower end plate 21, and a terminal box 23 is provided on the side of the cylinder 25. A stator shielding sleeve 24 is sleeved inside the cylinder 25, and a stator winding 22 is provided in the gap between the stator shielding sleeve 24 and the cylinder 25. An upper end plate 27 and an upper bearing seat 28 are provided above the cylinder 25 in sequence. An upper bearing 26 is embedded in the lower part of the upper bearing seat 28, and the upper part of the upper bearing seat 28 is sealed by a mechanical seal 29. A sealed cavity is formed inside the stator shielding sleeve 24 of the motor stator 2 and between the mechanical seal 29 and the bearing positioning seat 5. The sealed cavity is filled with flowing water for cooling the heat-generating motor and lubricating and cooling the high-speed rotating sliding bearing.

[0026] like Figure 3As shown, the motor rotor 3 includes a shaft 31, a cast aluminum rotor 32, a rotor shielding sleeve 33, an upper thrust plate 34, an upper shaft sleeve 35, a retaining spring 36, a lower shaft sleeve 37, a positioning screw 38, and a lower thrust plate 39. The cast aluminum rotor 32 is sleeved on the middle section of the shaft 31, and the rotor shielding sleeve 33 is sleeved on the outer side of the cast aluminum rotor 32. The upper end of the shaft 31 is sleeved with a retaining spring 36, an upper shaft sleeve 35, and an upper thrust plate 34 in sequence from top to bottom, and the lower end of the shaft 31 is sleeved with a lower shaft sleeve 37 and a lower thrust plate 39 in sequence from bottom to top. The motor rotor 3 rotates at high speed under the action of the motor stator 2.

[0027] The upper end of the shaft 31 is inserted into the thrust bearing 43 of the constant force thrust device 4, and the lower end of the shaft 31 is inserted into the bearing to be tested 54 of the bearing positioning seat 5 and is positioned by the side positioning screw 38 and locked by the stop screw 52. The positioning screw 38 specifically plays the role of positioning the lower height of the shaft and connecting the lower thrust plate 39 and the lower shaft sleeve 37 to the shaft 31. The shaft 31 drives the lower thrust plate 39 and the lower shaft sleeve 37 to rotate on the upper end face of the bearing to be tested 54, so the end face of the bearing to be tested 54 will be worn.

[0028] An electric control box 7 is provided inside the frame 1 , and the electric control box 7 is assembled with functions such as the switch of the servo electric cylinder 47 , the signal transmission of the pressure sensor 45 , and the adjustment of the servo electric cylinder 47 .

[0029] The frame 1 is connected to the lower bearing seat 53 and the lower connecting seat 51 in sequence by screws.

[0030] like Figure 6 As shown, a through hole is provided at the bottom of the frame 1. The through hole at the bottom of the frame 1, the gap between the bearing 54 to be tested and the lower sleeve 37, the gap between the rotor shielding sleeve 33 and the stator shielding sleeve 24, and the gap between the upper bearing 26 and the upper sleeve 35 form a cooling circulation water circuit 6 to prevent excessive heating of the cooling motor and lubricate and cool the bearing 54 to be tested and the lower sleeve 37, and the upper bearing 26 and the upper sleeve 35.

[0031] A detection method for a bearing wear tester specifically includes the following steps: S1: Start the servo electric cylinder 47, and manually input the constant pressure provided by the servo electric cylinder 47 to the constant thrust device 4 on the touch screen outside the electric control box 7. S2: Connect the cooling circulation water circuit 6 to the circulating water pump, start the circulating water pump, and the cooling circulation water circuit 6 starts to work. The circulating water pump passes water into the cooling circulation water circuit 6 to play a role in lubrication and cooling. S3: Start the shielded motor, the motor rotor 3 rotates at high speed under the action of the motor stator 2, and the lower thrust plate 39 and the lower shaft sleeve 37 are connected by the positioning screw 38 below the shaft 31 of the motor rotor 3. The rotation of the lower thrust plate 39 and the lower shaft sleeve 37 will cause wear on the upper end surface of the bearing 54 to be tested. S4: The pressure value of the servo electric cylinder 47 is measured in real time by the pressure sensor 45. Since the upper end surface of the bearing 54 to be tested will be worn, the pressure value fed back by the pressure sensor 45 decreases, and the servo electric cylinder 47 will continue to feed downwards after receiving the signal, and the servo electric cylinder 47 drives the shaft 31 to press downward to generate displacement, and the servo electric cylinder 47 records the displacement. S5: Generate a wear speed curve based on the wear amount and wear time data, and display the data and the wear speed curve on the touch screen to calculate the wear life of the bearing. S6: Shut down, first turn off the shielded motor, then turn off the circulating water pump, and finally lift and reset the servo electric cylinder 47.

[0032]

[0033] See Table 1 and Figure 7 Under different working conditions, the wear amount of the test bearing 54 will increase rapidly in the initial stage, and the wear rate will increase rapidly. After 200 hours, the wear rate will gradually decrease, and will gradually become flat after 600 hours.

[0034] The bearing wear resistance formula is: , ɑ is the original parameter of the friction surface, U is the wear amount at a certain moment, and r is the wear speed.

[0035] Original parameters of friction surface , t is the wear time, U is the wear amount at a certain moment, r is the wear speed, and the value of ɑ is also determined by the manufacturing accuracy and running-in wear. The probability density function of the wear speed r is: , is the mean value of r, S r is the standard deviation of r.

[0036] The present invention can simulate and predict the wear resistance life of the sliding bearing under actual working conditions, thereby increasing the reliability of the test data. The upper shaft sleeve 35 and the lower shaft sleeve 37 are sleeved on the shaft 31 to respectively connect the upper constant thrust device 4 and the lower bearing locating seat 5, and a bearing 54 to be tested is fixed in the bearing locating seat 5. The force is transmitted from the servo electric cylinder 47 above the constant thrust device 4 to the bearing 54 to be tested. The wear amount of the bearing 54 to be tested is represented by the displacement of the servo electric cylinder 47. The processing time and the initial constant force size are recorded to obtain a curve of the wear amount, wear time and constant load. The wear resistance life of the sliding bearing can be predicted by calculating the bearing wear resistance.

Claims

1. A bearing wear testing machine, comprising a frame and a canned pump, characterized in that: The frame (1) is provided with a bearing locating seat (5) inside, a shielded pump is vertically provided above the bearing locating seat (5), a constant thrust device (4) is connected above the shielded pump, the bearing locating seat (5) comprises a lower connecting seat (51), a lower bearing seat (53), a bearing to be tested (54), and a set screw (55), the upper end of the lower bearing seat (53) is connected to the lower end of the lower connecting seat (51), the upper end of the lower connecting seat (51) is threadedly connected to the shielded pump, the bearing to be tested (54) is embedded in the lower bearing seat (53) and is fixed by the set screw (55). 5) Locking, the constant force thrust device (4) comprises an upper connecting seat (41), an oil seal (42), a thrust bearing (43), a thrust bearing seat (44), a pressure sensor (45), and a cushion block (46). A thrust bearing seat (44) is provided below the upper connecting seat (41), a cushion block (46) and a pressure sensor (45) are provided between the thrust bearing seat (44) and the upper connecting seat (41), a thrust bearing (43) is provided below the thrust bearing seat (44), and an oil seal (42) is provided at the bottom end of the thrust bearing (43) for sealing.

2. A bearing wear testing machine according to claim 1, characterized in that: The canned motor pump comprises a motor stator (2) and a motor rotor (3), wherein the motor stator (2) is surrounded by the outside of the motor rotor (3), and the motor stator (2) comprises a lower end plate (21), a stator winding (22), a terminal box (23), a stator shielding sleeve (24), a cylinder (25), an upper bearing (26), an upper end plate (27), an upper bearing seat (28), and a mechanical seal (29). The lower end plate (21) is threadedly connected to the lower connecting seat (51). ) is provided above the cylinder (25), a terminal box (23) is provided on the side of the cylinder (25), a stator shielding sleeve (24) is sleeved inside the cylinder (25), a stator winding (22) is provided in the gap between the stator shielding sleeve (24) and the cylinder (25), an upper end plate (27) and an upper bearing seat (28) are provided above the cylinder (25), an upper bearing (26) is embedded in the lower part of the upper bearing seat (28), and the upper part of the upper bearing seat (28) is sealed by a mechanical seal (29).

3. A bearing wear testing machine according to claim 2, characterized in that: The motor rotor (3) comprises a shaft (31), a cast aluminum rotor (32), a rotor shielding sleeve (33), an upper thrust plate (34), an upper shaft sleeve (35), a retaining spring (36), a lower shaft sleeve (37), a positioning screw (38), and a lower thrust plate (39). The cast aluminum rotor (32) is sleeved on the middle section of the shaft (31), the rotor shielding sleeve (33) is sleeved on the outer side of the cast aluminum rotor (32), the retaining spring (36), the upper shaft sleeve (35), and the upper thrust plate (34) are sleeved on the upper end of the shaft (31) in sequence from top to bottom, and the lower shaft sleeve (37) and the lower thrust plate (39) are sleeved on the lower end of the shaft (31) in sequence from bottom to top.

4. A bearing wear testing machine according to claim 1 or 3, characterized in that: The upper end of the shaft (31) is inserted into the thrust bearing (43) of the constant force thrust device (4), and the lower end of the shaft (31) is inserted into the bearing to be tested (54) of the bearing positioning seat (5) and is positioned by the side positioning screw (38) and locked by the stop screw (52).

5. A bearing wear testing machine according to claim 1, characterized in that: An electric control box (7) is provided inside the frame (1), and a servo electric cylinder (47) is connected above the constant thrust device (4).

6. A bearing wear testing machine according to claim 1, characterized in that: The frame (1) is sequentially connected to the lower bearing seat (53) and the lower connecting seat (51) by means of screws.

7. A bearing wear testing machine according to claim 1, characterized in that: The bottom of the frame (1) is provided with a through hole, and the through hole at the bottom of the frame (1), the gap between the bearing to be tested (54) and the lower sleeve (37), the gap between the rotor shielding sleeve (33) and the stator shielding sleeve (24), and the gap between the upper bearing (26) and the upper sleeve (35) form a cooling circulation water path (6).

8. A detection method for a bearing wear testing machine according to any one of claims 1 to 7, characterized in that: The specific steps include: S1: Start the servo electric cylinder (47), and manually input the constant pressure provided by the servo electric cylinder (47) to the constant thrust device (4) on the touch screen outside the electric control box (7). S2: Start the external circulating water pump, and the cooling circulating water circuit (6) starts to work. S3: Start the shielded motor, and the motor rotor (3) starts to rotate at high speed under the action of the motor stator (2). S4: The pressure value of the servo electric cylinder (47) is measured in real time by the pressure sensor (45). If the pressure value drops, the shaft (31) in the motor rotor (3) will be pressed down as a whole, and the servo electric cylinder (47) records the displacement. S5: Generate a wear speed curve based on the wear amount and wear time data, display the data and the wear speed curve on the touch screen, and calculate the wear resistance life of the bearing. S6: Stop the machine, first turn off the shielded motor, then turn off the circulating water pump, and finally raise and reset the servo electric cylinder (47).

9. The detection method of a bearing wear testing machine according to claim 8, characterized in that: The bearing wear resistance formula is: , ɑ is the original parameter of the friction surface, U is the wear amount at a certain moment, and r is the wear speed.

10. The detection method of a bearing wear testing machine according to claim 9, characterized in that: The original parameters of the friction surface , t is the wear time, U is the wear amount at a certain moment, r is the wear speed, and the probability density function of the wear speed r is , is the mean value of r, S r is the standard deviation of r.

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