Pressure maintaining detection device and detection method for vacuum special bearing

Abstract

The invention relates to the technical field of bearing pressure maintaining detection, and discloses a pressure maintaining detection device and detection method for a vacuum special bearing, and the detection device comprises a detection seat, the detection seat is rotatably connected with a first air exhaust rod, and the first air exhaust rod is rotatably connected with a lower sealing shell. A sealing column is fixed at the upper end of the first air exhaust rod, a first sealing air bag is arranged in the sealing column, a second sealing air bag is arranged in the lower sealing shell, a movable second air exhaust rod is arranged above the detection seat, and an upper sealing shell is fixed at the lower end of the second air exhaust rod; a third sealing air bag is fixed in the upper sealing shell; the sealing performance of the two ends of the outer ring of the tested bearing can be further improved, the phenomenon of air leakage in the testing process and the influence on the detection precision are avoided, the sealing speed of the two ends of the bearing is high, the sealing effect is good, time and labor are saved, and convenience and rapidness are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing pressure maintenance detection, and in particular to a pressure maintenance detection device and a detection method for a vacuum-specific bearing. Background Art

[0002] The main purpose of the pressure test for vacuum-specific bearings is to ensure the sealing performance and reliability of the bearings in a vacuum environment. Specifically, the purpose of the pressure test is to: test the sealing performance: by monitoring the rate of change of the pressure in the vacuum system, determine whether there is a leak in the bearing. Evaluate the bearing's ability to resist deformation and breakage under negative pressure or vacuum conditions, prevent structural failure due to pressure changes, and maintain safe equipment operation. The vacuum level directly affects the efficiency and safety of the equipment. Leakage can cause air intrusion and reduce the vacuum level. Currently, the pressure test of bearings usually uses a vacuum sealing performance tester. The two ends of the sample are sealed, and the instrument uses vacuum gas to extract the pressure difference between the inside and outside of the sample. Then, the gas leakage of the sample or the expansion and shape recovery of the sample are observed to judge the sealing performance.

[0003] Since both ends of the vacuum-specific bearing are provided with seals, both ends of the vacuum-specific bearing need to be sealed simultaneously during the inspection process. In the prior art, when sealing the two ends of the bearing, two threaded rods are manually rotated, so that the threaded rods rotate and drive the sealing cover to move horizontally and stick to the end face of the bearing for sealing. This is time-consuming and labor-intensive, and the sealing speed is slow. In addition, when the number of vacuum-specific bearings to be inspected is large, the labor intensity of the staff is greatly increased, and the efficiency of the inspection is reduced. Summary of the Invention

[0004] The present invention provides a pressure-maintaining detection device and detection method for a vacuum-specific bearing, which can further improve the sealing performance of the two ends of the outer ring of the test bearing, avoid air leakage during testing, and affect the accuracy of the detection. The two ends of the bearing are sealed at a high speed and with a good sealing effect, saving time and effort, and being convenient and fast. It solves the problem mentioned in the above background technology that when sealing the two ends of the bearing, two threaded rods are manually rotated to cause the sealing cover to move horizontally and stick to the end face of the bearing for sealing during the rotation of the threaded rods, which is time-consuming and labor-intensive, with a slow sealing speed. Moreover, when the number of vacuum-specific bearings to be tested is large, the labor intensity of the common staff is greatly increased, and the efficiency of the detection is reduced.

[0005] The present invention provides the following technical solution: a pressure-maintaining detection device for a vacuum-specific bearing, comprising a detection seat, a first air-pumping rod rotatably connected to the detection seat, a lower sealing shell rotatably connected to the first air-pumping rod, a sealing column fixed to the upper end of the first air-pumping rod, a first sealing airbag disposed in the sealing column, a second sealing airbag disposed in the lower sealing shell, a movable second air-pumping rod disposed above the detection seat, an upper sealing shell fixed to the lower end of the second air-pumping rod, a third sealing airbag fixed in the upper sealing shell;

[0006] A piston cylinder is provided on the lower sealing shell, a hollow ventilation column is slidably connected to the upper sealing shell, a first piston plate is slidably connected in the piston cylinder, a sealing push block is slidably connected to the lower end of the hollow ventilation column, and the second pumping rod and the first pumping rod are both connected to a pressure sensor.

[0007] As an optional solution of the pressure maintaining detection device of the vacuum-specific bearing described in the present invention, wherein: a first spring is connected between the first piston plate and the piston cylinder, a second spring is connected between the sealing push block and the hollow ventilation column, and a ventilation hole is provided on the circumferential surface of the lower end of the hollow ventilation column, a third spring is connected between the upper end of the hollow ventilation column and the upper sealing shell, the lower end of the piston cylinder is connected to the second sealing airbag through a pipe, and the upper end of the hollow ventilation column is connected to the third sealing airbag through a pipe.

[0008] As an optional solution of the pressure maintaining detection device of the vacuum-specific bearing described in the present invention, wherein: a mounting bracket is fixed on one side of the detection seat, an electric push rod is fixed on the mounting bracket, the upper end of the second vacuum rod is rotatably connected to a strip plate, and the strip plate is elastically connected to the piston rod of the electric push rod through a fourth spring.

[0009] As an optional solution of the pressure maintaining detection device of the vacuum-specific bearing described in the present invention, wherein: a cavity is provided in the sealing column, a second piston plate is provided in the cavity, an inflatable airbag is provided in the cavity, the inflatable airbag is connected to the first sealing airbag through a pipe, and a rotary joint is installed on the first vacuum rod and the second vacuum rod.

[0010] As an optional solution of the pressure maintaining detection device of the vacuum-specific bearing described in the present invention, wherein: a first gear is fixed on the second vacuum rod, a first rack is meshedly connected to the first gear, a first contact frame is fixed on the first rack, and the first contact frame is elastically connected to the strip plate through a sixth spring.

[0011] As an optional solution of the pressure maintaining detection device of the vacuum-specific bearing described in the present invention, several first contact clamping blocks are slidably connected to the circumferential surface of the upper sealing shell, a seventh spring is connected between the first contact clamping block and the upper sealing shell, and a contact ring is in contact with the bottom of the first contact clamping block, and the contact ring is fixed to the upper end of the hollow ventilation column.

[0012] As an optional solution of the pressure maintaining detection device of the vacuum-specific bearing described in the present invention, wherein: a plurality of second interference clamping blocks equidistantly distributed around the circumference are slidably connected to the sealing column, an eighth spring is connected between the second interference clamping block and the sealing column, a first interference rod is fixed on the second piston plate, and the first interference rod interferes with the second interference clamping block.

[0013] As an optional solution of the pressure maintaining detection device of the vacuum-specific bearing described in the present invention, a pressure reducing cylinder is provided in the detection seat, an air intake pipe is connected to the bottom of the pressure reducing cylinder, and a third piston plate is slidably connected in the pressure reducing cylinder, a valve is connected to the air intake pipe, a second resistance rod is fixed on the third piston plate, and a ninth spring is connected between the third piston plate and the pressure reducing cylinder.

[0014] As an optional solution of the pressure maintaining detection device for the vacuum-specific bearing described in the present invention, wherein: a second gear is fixed on the second vacuum rod, a second rack is meshedly connected to the second gear, the second rack is elastically connected to the detection seat through a fifth spring, a conflicting wedge is fixed on the second rack, and the second conflicting rod conflicts with the conflicting wedge.

[0015] A pressure maintenance detection method for a vacuum bearing includes the following specific steps:

[0016] Step 1: Sealing the loading material and the outer ring of the bearing. Connect both ends of the vacuum suction pipe of the vacuum pumping and pressure equipment to the rotary joints on the second suction rod and the first suction rod at the same time, and set the tested bearing set on the sealing column on the first suction rod. The piston rod of the electric push rod drives the elastically connected strip plate to move downward, so that the upper sealing shell moves downward, so that the two ends of the bearing are respectively clamped between the upper sealing shell and the lower sealing shell. At the same time, the hollow ventilation column on the upper sealing shell drives the sealing push block to press against the first piston plate in the piston cylinder, so that the first piston plate slides in the piston cylinder to compress the air. First, the second sealing airbag set in the lower sealing shell is inflated, and then the air flows into the third sealing airbag through the hollow ventilation column to expand, which can achieve the purpose of sealing both ends of the bearing outer ring and avoid air leakage during the test.

[0017] Step 2: Sealing and static testing of the bearing inner ring. When the vacuum pumping equipment is pumping vacuum, part of the vacuum negative pressure flows into the cavity in the sealing column, prompting the second piston plate to move down and squeeze the inflatable airbag, causing the first sealing airbag to expand, reducing the gap between the bearing inner ring and the sealing column to prevent air circulation. The vacuum pumping equipment extracts the air, and after reaching the preset negative pressure value, it stops pumping and maintains the pressure for a period of time. The pressure sensor monitors whether the pressure at both ends of the bearing recovers: if the pressure is stable, the bearing seal is qualified; if there is leakage when the pressure recovers, the seal is unqualified;

[0018] Step 3, dynamic detection of the bearing, adjust the telescopic length of the electric push rod piston rod, prompt the piston rod to move down and reciprocate with the first contact frame, so that the first contact frame drives the first rack to drive the first gear to rotate, so that the upper sealing shell and the lower sealing shell fixed on the second vacuum rod drive the outer ring of the bearing to rotate synchronously. Under the condition that the pressure remains unchanged, the outer ring of the bearing can be dynamically detected, and the sealing detection of the bearing in the working environment can be simulated. The pressure sensor is used to monitor whether the pressure at both ends of the bearing rises: if the pressure is stable, the bearing seal is qualified; if there is leakage when the pressure rises, the seal is unqualified;

[0019] Step 4: Pressure difference detection of the bearing. The air inlet pipe is connected to the rotary joint of the first vacuum rod, and the valve is opened. The air flow in the pressure reducing cylinder enters the suction pipe of the vacuum pressure extraction equipment, which reduces the negative pressure in the upper sealing shell and the lower sealing shell, and increases the negative pressure in the pressure reducing cylinder. This can achieve the purpose of driving the third piston plate and the second interference rod to move downward synchronously, so that the second interference rod and the interference wedge block are released from interference, and the second rack is driven to rotate by horizontal movement. This can achieve the purpose of the second vacuum rod driving the sealing column and the inner ring of the bearing to rotate. The bearing is dynamically tested for pressure difference, and the pressure change curve is monitored by the pressure sensor. The sealing performance is judged by measuring the pressure difference change between the test bearing and the qualified bearing.

[0020] The present invention has the following beneficial effects:

[0021] 1. In the pressure-maintaining detection device for vacuum-specific bearings, the sealing column fixed on the first vacuum rod facilitates the insertion and loading of materials during bearing testing. The second piston piece arranged in the sealing column can realize the purpose of squeezing the inflatable airbag by the second piston piece to expand the first sealing airbag when vacuuming, and automatically seal the inner ring of the tested bearing to avoid the connection between the two ends of the bearing affecting the test results of the two seals on the bearing under a vacuum environment. When the second vacuum rod is driven downward by the electric push rod, the end face of the outer ring of the test bearing can be firmly pressed against the upper sealing shell and the lower sealing shell for sealing. At the same time, when the upper sealing shell moves downward, it can drive the air bag to be sealed. The hollow vent column and the sealing push block are inserted into the piston cylinder to push the first piston plate to move, which can compress the air in the piston cylinder and prompt the second sealing airbag to automatically expand first. When the second sealing airbag completes expansion, the hollow vent column can be inserted into the first piston plate to achieve the purpose of connecting the hollow vent column with the piston cylinder, prompting the compressed gas to automatically expand the third sealing airbag. In the expanded state, the second and third sealing airbags can further improve the sealing performance of both ends of the outer ring of the test bearing, avoid air leakage during the test, and affect the accuracy of the test. The sealing speed of both ends of the bearing is fast and the sealing effect is good, which saves time and effort and is convenient and fast.

[0022] When the first pumping rod and the second pumping rod are connected to the vacuum equipment, the lower sealing shell and the upper sealing shell can be vacuumed at the same time. When the vacuum pressure reaches the set value, the vacuum equipment is shut down. Through the pressure sensors on the second pumping rod and the first pumping rod, the purpose of detecting the pressure changes in the lower sealing shell and the upper sealing shell in a static environment can be achieved. Through the pressure value changes of the pressure sensors, it is convenient to judge whether the tested bearing is a qualified product;

[0023] 2. In the pressure-maintaining detection device for vacuum-specific bearings, the first gear on the second air-extraction rod and the first rack on the first contact frame engage with each other, so that when the electric push rod piston rod reciprocates over a certain distance, it can come into contact with the first contact frame to cause the second air-extraction rod to intermittently reciprocate, so that the upper sealing shell and the lower sealing shell drive the outer ring of the bearing to rotate synchronously, so that the outer ring of the bearing can be dynamically detected while the pressure on the bearing remains unchanged, and the sealing detection can be performed under the working environment of the simulated bearing rotation, which can greatly improve the authenticity and reliability of the bearing sealing detection;

[0024] After the first interference clamping blocks slidably connected on the upper sealing shell come into contact with the interference ring, the outer ring of the bearing can be clamped during the test, thereby improving the rotation stability of the outer ring of the bearing during dynamic testing. During the vacuum test, the second piston plate in the sealing column can achieve the purpose of the second piston plate driving the first interference rod to move vertically, prompting the first interference rod to come into contact with the second interference clamping block, making it convenient for the second interference clamping block to clamp and fix the inner ring of the bearing, thereby improving the rotation stability of the inner ring of the bearing.

[0025] 3. In the pressure maintenance detection device of the vacuum-specific bearing, the detected vacuum negative pressure can be transmitted to the pressure reducing cylinder through the cooperation of the pressure reducing cylinder, the air intake pipe and the valve in the detection seat. A pressure difference detection environment can be formed during the bearing test, which is convenient for testing the structural tolerance of the bearing seal. At the same time, the third piston plate in the pressure reducing cylinder can drive the second interference rod to move as the negative pressure value of the pressure reducing cylinder continues to increase, and the second interference rod can be made to conflict with the interference wedge block, prompting the second rack to drive the second gear fixed on the second vacuum rod to rotate, so that the sealing column can drive the inner ring of the bearing to rotate in the pressure difference detection environment for dynamic detection, thereby greatly improving the detection effect of the bearing sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is one of the three-dimensional structural diagrams of the present invention.

[0027] Figure 2 This is the second schematic diagram of the three-dimensional structure of the present invention.

[0028] Figure 3 It is a structural cross-sectional view of the present invention.

[0029] Figure 4 It is a cross-sectional view of the pressure-reducing cylinder structure of the present invention.

[0030] Figure 5 for Figure 3 A partial enlarged schematic diagram of point A in the middle.

[0031] Figure 6 for Figure 3 A partial enlarged schematic diagram of point B in the middle.

[0032] Figure 7 This is a flowchart of the pressure maintenance detection method for vacuum-specific bearings of the present invention.

[0033] In the figure: 1. Detection seat; 2. First air extraction rod; 3. Lower sealing shell; 4. Sealing column; 5. Second sealing airbag; 6. First sealing airbag; 7. Second air extraction rod; 8. Fifth spring; 9. Upper sealing shell; 10. Third sealing airbag; 11. Piston cylinder; 12. Hollow vent column; 13. First piston plate; 14. Sealing push block; 15. First spring; 16. Second spring; 17. Vent hole; 18. Third spring; 19. Interference wedge; 20. Mounting frame; 21. Electric push rod; 22. Strip plate; 23. Fourth spring; 24. Cavity; 25. Second piston plate; 26. Inflatable airbag; 27. Rotary joint; 28. First gear; 29. ​​First rack; 30. First interference frame; 31. Sixth spring; 32. First interference clamping block; 33. Seventh spring; 34. Interference ring; 35. Second interference clamping block; 36. Eighth spring; 37. First interference rod; 38. Pressure reducing cylinder; 39. Inlet pipe; 40. Third piston plate; 41. Valve; 42. Second interference rod; 43. Ninth spring; 44. Second gear; 45. Second rack; 46. Pressure sensor. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] For example 1, please refer to Figures 1 to 7 A pressure-maintaining detection device for a vacuum-specific bearing includes a detection seat 1, a first air-extraction rod 2 being rotatably connected to the detection seat 1, a lower sealing shell 3 being rotatably connected to the first air-extraction rod 2, a sealing column 4 being fixed to the upper end of the first air-extraction rod 2, a first sealing airbag 6 being provided in the sealing column 4, a second sealing airbag 5 being provided in the lower sealing shell 3, a movable second air-extraction rod 7 being provided above the detection seat 1, an upper sealing shell 9 being fixed to the lower end of the second air-extraction rod 7, a third sealing airbag 10 being fixed in the upper sealing shell 9;

[0036] A piston cylinder 11 is provided on the lower sealing shell 3, a hollow ventilation column 12 is slidably connected to the upper sealing shell 9, a first piston plate 13 is slidably connected in the piston cylinder 11, a sealing push block 14 is slidably connected to the lower end of the hollow ventilation column 12, and a pressure sensor 46 is connected to both the second vacuum rod 7 and the first vacuum rod 2.

[0037] A first spring 15 is connected between the first piston plate 13 and the piston cylinder 11, a second spring 16 is connected between the sealing push block 14 and the hollow vent column 12, and a vent hole 17 is provided on the circumferential surface of the lower end of the hollow vent column 12, a third spring 18 is connected between the upper end of the hollow vent column 12 and the upper sealing shell 9, the lower end of the piston cylinder 11 is connected to the second sealing airbag 5 through a pipe, and the upper end of the hollow vent column 12 is connected to the third sealing airbag 10 through a pipe.

[0038] A mounting bracket 20 is fixed on one side of the detection base 1, and an electric push rod 21 is fixed on the mounting bracket 20. The upper end of the second vacuum rod 7 is rotatably connected to a strip plate 22, and the strip plate 22 is elastically connected to the piston rod of the electric push rod 21 through a fourth spring 23.

[0039] A cavity 24 is provided in the sealing column 4, a second piston plate 25 is provided in the cavity 24, an inflatable airbag 26 is provided in the cavity 24, the inflatable airbag 26 is connected to the first sealing airbag 6 through a pipe, and a rotary joint 27 is installed on the first pumping rod 2 and the second pumping rod 7.

[0040] When testing vacuum bearings, refer to Figures 1-6 , connect both ends of the vacuum suction pipe of the vacuum pumping equipment to the rotary joints 27 on the second suction rod 7 and the first suction rod 2 at the same time, and the detected bearing sleeve is mounted on the sealing column 4 on the first suction rod 2, and the electric push rod 21 fixed on the mounting frame 20 is started. The electric push rod 21 drives the strip plate 22, the second suction rod 7 and the upper sealing shell 9 to move downward, firmly against the detected bearing, so that the two ends of the bearing are respectively clamped between the upper sealing shell 9 and the lower sealing shell 3. At the same time, the hollow ventilation column 12 on the upper sealing shell 9 drives the sealing push block 14 to press against the first piston plate 13 in the piston cylinder 11, and the lower end of the hollow ventilation column 12 presses against the through-hole end of the first piston plate 13, and the sealing push block 14 slides in the piston cylinder 11. As the upper sealing shell 9 moves downward, the first piston plate 13 can slide in the piston cylinder 11 to compress the air, and the first spring 15 accumulates force. At this time, the compressed gas in the piston cylinder 11 is transported to the second sealing airbag 5 through the pipeline for expansion. When the second sealing airbag 5 can no longer expand, when the hollow vent column 12 drives the sealing push block 14 to continue to move downward, the sealing push block 14 continues to rest on the first piston plate 13, and the sealing push block 14 slides on the hollow vent column 12, the second spring 16 accumulates force, and the lower end of the hollow vent column 12 is inserted into the first piston plate 13. At this time, the vent hole 17 is connected to the piston cylinder 11, so that part of the compressed gas can flow into the hollow vent column 12, thereby achieving the purpose of inflating the third sealing airbag 10, which can further improve the sealing performance of both ends of the test bearing outer ring, avoid air leakage during testing, affect the detection accuracy of the two sealants, improve the speed of sealing at both ends of the bearing, and have good sealing effect, saving time and effort, and being convenient and fast;

[0041] When the vacuum pumping device is evacuating, the air inside the cavity 24 of the sealing column 4 is evacuated, forming a negative pressure state, prompting the second piston plate 25 to move downward to squeeze the inflatable airbag 26. The gas inside the inflatable airbag 26 is pressurized and flows into the first sealing airbag 6, causing the first sealing airbag 6 to expand, reducing the gap between the inner ring of the bearing and the sealing column 4, avoiding air circulation, and affecting the accuracy of the separate detection of the two sealants during vacuum pumping. The vacuum pumping device extracts the air and, after reaching the preset negative pressure value, stops pumping and maintains the pressure for a period of time, thereby achieving the purpose of static detection of the seals at both ends of the bearing. The pressure sensor 46 is used to monitor whether the pressure at both ends of the bearing has recovered: if the pressure is stable, the bearing seal is qualified; if there is leakage when the pressure recovers, the seal is unqualified;

[0042] Example 2: This example is an improvement based on Example 1. For details, please refer to Figures 1 to 7 A first gear 28 is fixed on the second air pumping rod 7, a first rack 29 is meshedly connected to the first gear 28, a first interference frame 30 is fixed on the first rack 29, and the first interference frame 30 is elastically connected to the strip plate 22 through a sixth spring 31.

[0043] Several first contact clamping blocks 32 are slidably connected to the circumferential surface of the upper sealing shell 9, a seventh spring 33 is connected between the first contact clamping block 32 and the upper sealing shell 9, a contact ring 34 is in contact with the bottom of the first contact clamping block 32, and the contact ring 34 is fixed to the upper end of the hollow ventilation column 12.

[0044] In order to improve the authenticity and reliability of bearing seal detection, dynamic detection is required when the bearing is in a rotating working environment. Figures 1-6 When the piston rod of the electric push rod 21 continues to move downward intermittently, the position height of the second air pumping rod 7 can be kept unchanged, the strip plate 22 slides on the piston rod of the electric push rod 21, and the fourth spring 23 accumulates force. The piston rod of the electric push rod 21 moves downward to achieve the purpose of intermittent interference with the first contact frame 30, prompting the first contact frame 30 to be interfered with and drive the first rack 29 to slide on the strip plate 22. The sixth spring 31 continuously accumulates force and releases elastic force, and the first rack 29 and the first gear 28 fixed on the second air pumping rod 7 are connected. The purpose of driving the first gear 28, the second air pumping rod 7 and the upper sealing shell 9 to rotate can be achieved. Since the sealing push block 14 is in the piston cylinder 11, the upper sealing shell 9 and the lower sealing shell 3 fixed on the second air pumping rod 7 drive the outer ring of the bearing to rotate synchronously. Under the condition that the pressure remains unchanged, the outer ring of the bearing can be dynamically tested. It can simulate the sealing test of the bearing in the working environment. The pressure sensor 46 is used to monitor whether the pressure at both ends of the bearing has recovered: if the pressure is stable, the bearing seal is qualified; if the pressure recovers and there is leakage, the seal is unqualified;

[0045] At the same time, in order to improve the stability of the rotation of the outer ring of the bearing, it is necessary to clamp the outer ring of the bearing to avoid slipping, which makes the outer ring unable to rotate normally during dynamic detection and affects the detection effect and accuracy. When the outer ring of the bearing is clamped, after the third sealing airbag 10 completes expansion, the gas inside the piston cylinder 11 continues to compress, which can achieve the purpose of pushing the hollow ventilation column 12, prompting the upper end of the hollow ventilation column 12 to drive the interference ring 34 to move vertically upward, and the third spring 18 accumulates force. When the interference ring 34 moves vertically, it can achieve the purpose of interfering with the second interference clamping blocks 35 equidistantly distributed on the circumference, prompting the second interference clamping blocks 35 to slide on the upper sealing shell 9, and the seventh spring 33 accumulates force, thereby pressing against the outer ring of the bearing, thereby improving the stability of the rotation of the outer ring of the bearing during dynamic detection;

[0046] Example 3: This example is an improvement based on Example 1. For details, please refer to Figures 1 to 7 A pressure-reducing cylinder 38 is provided in the detection seat 1, and an air intake pipe 39 is connected to the bottom of the pressure-reducing cylinder 38. A third piston piece 40 is slidably connected in the pressure-reducing cylinder 38, and a valve 41 is connected to the air intake pipe 39. A second resistance rod 42 is fixed on the third piston piece 40, and a ninth spring 43 is connected between the third piston piece 40 and the pressure-reducing cylinder 38.

[0047] A second gear 44 is fixed on the second vacuum rod 7 , and a second rack 45 is meshedly connected to the second gear 44 . The second rack 45 is elastically connected to the detection seat 1 through the fifth spring 8 . A conflict wedge 19 is fixed on the second rack 45 , and the second conflict rod 42 conflicts with the conflict wedge 19 .

[0048] The sealing column 4 is slidably connected to a plurality of second interference clamping blocks 35 equidistantly distributed around the circumference, an eighth spring 36 is connected between the second interference clamping block 35 and the sealing column 4, and a first interference rod 37 is fixed on the second piston plate 25, and the first interference rod 37 interferes with the second interference clamping block 35.

[0049] In order to further improve the detection range and detection effect of bearing seals, it is necessary to perform pressure differential detection of bearing seals under vacuum pressure changes. Figure 1-Figure 7The air inlet pipe 39 is connected to the rotary joint 27 of the first air pumping rod 2, and the valve 41 is opened, so that the air flow in the pressure-reducing cylinder 38 enters the suction pipe of the vacuum pressure pumping equipment, and the air pressure in the pressure-reducing cylinder 38 gradually decreases, and the air pressure in the suction pipe of the vacuum pressure pumping equipment gradually rises, thereby reducing the vacuum negative pressure in the upper sealing shell 9 and the lower sealing shell 3, and the negative pressure enters the pressure-reducing cylinder 38, which can achieve the purpose of driving the third piston plate 40 and the second interference rod 42 to move downward synchronously. The ninth spring 43 stores force, so that the second interference rod 42 and the interference wedge 19 are released from the interference, and the fifth spring 8 releases the elastic force, prompting the second rack 45 to move horizontally and drive the second rack 45 to rotate, so that the second air pumping rod 7 can drive the sealing column 4 and the inner ring of the bearing to rotate, and perform dynamic pressure difference detection on the bearing. The pressure change curve is monitored by the pressure sensor 46, and the sealing performance of the test bearing is judged by measuring the pressure difference change between the test bearing and the qualified bearing.

[0050] At the same time, in order to improve the smoothness of the rotation of the inner ring of the bearing, the inner ring of the bearing needs to be clamped. When the inner ring of the bearing is clamped, when the first vacuum rod 2 is vacuumed, the second piston plate 25 can drive the first interference rod 37 to move vertically, causing the first interference rod 37 to conflict with the second interference clamping block 35, so that the second interference clamping block 35 can move horizontally on the sealing column 4. The eighth spring 36 accumulates force to achieve the purpose of tightening and fixing the inner ring of the bearing.

[0051] For example 4, please refer to Figures 1 to 7 A pressure maintenance detection method for a vacuum bearing includes the following specific steps:

[0052] Step 1, sealing of the loading and bearing outer ring, connect both ends of the vacuum pumping equipment suction pipe to the second pumping rod 7 and the rotary joint 27 on the first pumping rod 2 at the same time, put the tested bearing set on the sealing column 4 on the first pumping rod 2, and drive the elastically connected strip plate 22 downward through the piston rod of the electric push rod 21, so that the upper sealing shell 9 moves downward, so that the two ends of the bearing are respectively clamped between the upper sealing shell 9 and the lower sealing shell 3, and at the same time, the hollow ventilation column 12 on the upper sealing shell 9 drives the sealing push block 14 to press against the first piston plate 13 in the piston cylinder 11, so that the first piston plate 13 slides in the piston cylinder 11 to compress the air, first expand the second sealing airbag 5 provided in the lower sealing shell 3, and then flow into the third sealing airbag 10 through the hollow ventilation column 12 for expansion, so as to achieve the purpose of sealing both ends of the bearing outer ring and avoid air leakage during the test;

[0053] Step 2: Sealing and static testing of the bearing inner ring. When the vacuum pumping device is evacuating, a portion of the vacuum negative pressure flows into the cavity 24 in the sealing column 4, prompting the second piston plate 25 to move downward to squeeze the inflatable airbag 26, causing the first sealing airbag 6 to expand, reducing the gap between the bearing inner ring and the sealing column 4 to prevent air circulation. The vacuum pumping device extracts the air, and after reaching the preset negative pressure value, it stops pumping and maintains the pressure for a period of time. The pressure sensor 46 monitors whether the pressure at both ends of the bearing recovers: if the pressure is stable, the bearing seal is qualified; if there is leakage during the pressure recovery, the seal is unqualified;

[0054] Step 3, dynamic detection of the bearing, adjust the telescopic length of the piston rod of the electric push rod 21, prompt the piston rod to move down and reciprocate with the first contact frame 30, so that the first contact frame 30 drives the first rack 29 to drive the first gear 28 to rotate, so that the upper sealing shell 9 and the lower sealing shell 3 fixed on the second vacuum rod 7 drive the outer ring of the bearing to rotate synchronously. Under the condition that the pressure remains unchanged, the outer ring of the bearing can be dynamically detected, and the sealing detection of the bearing in the working environment can be simulated. The pressure sensor 46 monitors whether the pressure at both ends of the bearing rises: if the pressure is stable, the bearing seal is qualified; if there is leakage when the pressure rises, the seal is unqualified;

[0055] Step 4: Pressure difference detection of the bearing. The air inlet pipe 39 is connected to the rotary joint 27 of the first vacuum rod 2, and the valve 41 is opened. The air flow in the pressure reducing cylinder 38 enters the suction pipe of the vacuum pressure extraction equipment, so that the negative pressure in the upper sealing shell 9 and the lower sealing shell 3 is reduced, and the negative pressure in the pressure reducing cylinder 38 is increased, which can achieve the purpose of driving the third piston plate 40 and the second interference rod 42 to move downward synchronously, so that the second interference rod 42 and the interference wedge block 19 are released from interference, and the second rack 45 is driven to move horizontally to rotate the second rack 45, so that the second vacuum rod 7 can drive the sealing column 4 and the inner ring of the bearing to rotate, and perform dynamic pressure difference detection on the bearing. The pressure change curve is monitored by the pressure sensor 46, and the sealing performance is judged by measuring the pressure difference change between the test bearing and the qualified bearing.

[0056] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A pressure-maintaining detection device for a vacuum bearing, comprising a detection seat (1), characterized in that: The detection seat (1) is rotatably connected to a first air pumping rod (2), the first air pumping rod (2) is rotatably connected to a lower sealing shell (3), and a sealing column (4) is fixed to the upper end of the first air pumping rod (2), a first sealing airbag (6) is provided in the sealing column (4), a second sealing airbag (5) is provided in the lower sealing shell (3), a movable second air pumping rod (7) is provided above the detection seat (1), an upper sealing shell (9) is fixed to the lower end of the second air pumping rod (7), and a third sealing airbag (10) is fixed in the upper sealing shell (9); The lower sealing shell (3) is provided with a piston cylinder (11), the upper sealing shell (9) is slidably connected to a hollow ventilation column (12), the piston cylinder (11) is slidably connected to a first piston plate (13), the lower end of the hollow ventilation column (12) is slidably connected to a sealing push block (14), and the second air pumping rod (7) and the first air pumping rod (2) are both connected to a pressure sensor (46).

2. The pressure maintaining detection device for vacuum bearings according to claim 1, characterized in that: A first spring (15) is connected between the first piston plate (13) and the piston cylinder (11), a second spring (16) is connected between the sealing push block (14) and the hollow vent column (12), and a vent hole (17) is provided on the circumferential surface of the lower end of the hollow vent column (12), a third spring (18) is connected between the upper end of the hollow vent column (12) and the upper sealing shell (9), the lower end of the piston cylinder (11) is connected to the second sealing airbag (5) through a pipeline, and the upper end of the hollow vent column (12) is connected to the third sealing airbag (10) through a pipeline.

3. The pressure maintaining detection device for vacuum bearings according to claim 1, characterized in that: A mounting bracket (20) is fixed on one side of the detection seat (1), an electric push rod (21) is fixed on the mounting bracket (20), and the upper end of the second air pumping rod (7) is rotatably connected to a strip plate (22), and the strip plate (22) is elastically connected to the piston rod of the electric push rod (21) through a fourth spring (23).

4. The pressure maintaining detection device for vacuum bearings according to claim 1, characterized in that: A cavity (24) is provided in the sealing column (4), a second piston plate (25) is provided in the cavity (24), an inflatable airbag (26) is provided in the cavity (24), the inflatable airbag (26) is connected to the first sealing airbag (6) through a pipeline, and a rotary joint (27) is installed on the first pumping rod (2) and the second pumping rod (7).

5. The pressure maintaining detection device for vacuum bearings according to claim 3, characterized in that: A first gear (28) is fixed on the second air pumping rod (7), a first rack (29) is meshedly connected to the first gear (28), a first abutment frame (30) is fixed on the first rack (29), and the first abutment frame (30) is elastically connected to the strip plate (22) via a sixth spring (31).

6. The pressure maintaining detection device for vacuum bearings according to claim 1, characterized in that: A plurality of first abutting clamping blocks (32) are slidably connected to the circumferential surface of the upper sealing shell (9), a seventh spring (33) is connected between the first abutting clamping block (32) and the upper sealing shell (9), a abutting ring (34) is abutted below the first abutting clamping block (32), and the abutting ring (34) is fixed to the upper end of the hollow vent column (12).

7. The pressure maintaining detection device for vacuum bearings according to claim 4, characterized in that: The sealing column (4) is slidably connected to a plurality of second conflicting clamping blocks (35) distributed equidistantly around the circumference, an eighth spring (36) is connected between the second conflicting clamping block (35) and the sealing column (4), and a first conflicting rod (37) is fixed on the second piston plate (25), and the first conflicting rod (37) conflicts with the second conflicting clamping block (35).

8. The pressure maintaining detection device for vacuum bearings according to claim 1, characterized in that: A pressure reducing cylinder (38) is provided in the detection seat (1), the bottom of the pressure reducing cylinder (38) is connected to an air intake pipe (39), and a third piston plate (40) is slidably connected in the pressure reducing cylinder (38), a valve (41) is connected to the air intake pipe (39), a second resistance rod (42) is fixed on the third piston plate (40), and a ninth spring (43) is connected between the third piston plate (40) and the pressure reducing cylinder (38).

9. The pressure maintaining detection device for vacuum bearings according to claim 8, characterized in that: A second gear (44) is fixed on the second air pumping rod (7), a second rack (45) is meshedly connected to the second gear (44), the second rack (45) is elastically connected to the detection seat (1) through a fifth spring (8), a contact wedge (19) is fixed on the second rack (45), and the second contact rod (42) contacts the contact wedge (19).

10. A pressure-maintaining detection method for a vacuum bearing, characterized in that: The specific steps include: Step 1: Seal the outer ring of the bearing by feeding the material. Connect the two ends of the vacuum suction pipe to the rotary joint (27) on the second suction rod (7) and the first suction rod (2). Put the bearing to be tested on the sealing column (4) on the first suction rod (2). The piston rod of the electric push rod (21) drives the elastically connected strip plate (22) to move downward, so that the upper sealing shell (9) moves downward, so that the two ends of the bearing are respectively clamped between the upper sealing shell (9) and the lower sealing shell (3). At the same time, the upper sealing shell (9) is pressed against the upper sealing shell (9). The hollow vent column (12) on the sealing shell (9) drives the sealing push block (14) to press against the first piston plate (13) in the piston cylinder (11), so that the first piston plate (13) slides in the piston cylinder (11) to compress the air, first expanding the second sealing airbag (5) provided in the lower sealing shell (3), and then flowing into the third sealing airbag (10) through the hollow vent column (12) to expand, thereby achieving the purpose of sealing both ends of the bearing outer ring and avoiding air leakage during the test process; Step 2: Sealing and static testing of the inner ring of the bearing. When the vacuum pumping device is evacuated, a portion of the vacuum negative pressure flows into the cavity (24) in the sealing column (4), prompting the second piston plate (25) to move downward to squeeze the inflatable airbag (26), causing the first sealing airbag (6) to expand, reducing the gap between the inner ring of the bearing and the sealing column (4) to prevent air circulation. The vacuum pumping device extracts the air, and after reaching a preset negative pressure value, stops pumping and maintains the pressure for a period of time. The pressure sensor (46) is used to monitor whether the pressure at both ends of the bearing has recovered: if the pressure is stable, the bearing seal is qualified; if there is leakage when the pressure recovers, the seal is unqualified; Step 3: Dynamic detection of the bearing. Adjust the telescopic length of the piston rod of the electric push rod (21) to force the piston rod to move downward and to reciprocate with the first contact frame (30), so that the first contact frame (30) drives the first rack (29) to drive the first gear (28) to rotate, so that the upper sealing shell (9) and the lower sealing shell (3) fixed on the second vacuum rod (7) drive the outer ring of the bearing to rotate synchronously. Under the condition that the pressure remains unchanged, the outer ring of the bearing can be dynamically detected, and the sealing detection of the bearing in the working environment can be simulated. The pressure sensor (46) is used to monitor whether the pressure at both ends of the bearing rises: if the pressure is stable, the bearing seal is qualified; if there is leakage when the pressure rises, the seal is unqualified; Step 4: Bearing pressure difference detection. The air inlet pipe (39) is connected to the rotary joint (27) of the first air extraction rod (2). The valve (41) is opened, and the air flow in the pressure reducing cylinder (38) enters the suction pipe of the vacuum pressure extraction equipment, so that the negative pressure in the upper sealing shell (9) and the lower sealing shell (3) is reduced, and the negative pressure in the pressure reducing cylinder (38) is increased, which can achieve the purpose of driving the third piston plate (40) and the second contact rod (42) to move downward synchronously, so that the second contact rod (42) and the contact wedge (19) are released from the conflict, and the second rack (45) is driven to move horizontally to drive the second rack (45) to rotate, so that the second air extraction rod (7) drives the sealing column (4) and the inner ring of the bearing to rotate. The bearing is subjected to dynamic pressure difference detection. The pressure change curve is monitored by the pressure sensor (46). The sealing performance is judged by measuring the pressure difference change between the test bearing and the qualified bearing.

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