Bearing airtight performance detection device

Abstract

The utility model provides a bearing airtight performance detection device, comprising a bottom plate used for placing a bearing to be detected; the outer sleeve is driven by a lifting assembly to ascend and descend and sleeved with or away from the bearing, and an air inlet penetrating through the inner wall and the outer wall is formed in the outer sleeve; the inserting shaft is elastically connected with the outer sleeve through a spring; the inserting shaft is inserted into an inner hole of the bearing; when the outer sleeve is far away from the bearing, the inserting shaft is separated from the bearing under the action of the spring; the outlet end of the insertion shaft is connected with a flow meter; the air inlet hole and the air outlet hole form a detection air channel; and the detection air passage passes through the inner and outer sides of the lip-shaped sealing ring in the bearing. By means of the arrangement, bearing disassembly and assembly can be achieved through lifting of the outer sleeve, operation is easy, convenient and fast, and efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, in particular to a bearing airtightness performance detection device. Background Art

[0002] There are two types of sealed needle roller bearings. One is a stamped outer ring needle roller bearing as disclosed in Chinese patent CN102506065A, which has a lip seal located on one side of the bearing; the other is a throttle needle roller bearing and a manufacturing method thereof as disclosed in Chinese patent CN101818761A, which has two lip seals located on both sides of the bearing and also on both sides of the frame.

[0003] In the case of lip seal size error and assembly error, leakage is likely to occur, so the above bearings need to be tested for air tightness before being sold.

[0004] Chinese patent CN218628838U discloses a sealed bearing air tightness test tool. When disassembling and assembling the bearing, it is necessary to involve the threaded cooperation between the second internal threaded mounting part and the first threaded mounting part, and the threaded cooperation between the second threaded mounting part and the first internal threaded mounting part. The operation is cumbersome and the detection efficiency is low. Utility Model Content

[0005] In order to solve the technical problems in the background technology, the utility model discloses a bearing airtightness performance detection device.

[0006] The utility model provides a bearing air tightness performance detection device, comprising:

[0007] A base plate for placing the bearing to be tested;

[0008] The outer sleeve is driven to rise and fall by the lifting assembly, and is sleeved or away from the bearing. The outer sleeve is provided with an air inlet hole penetrating the inner and outer walls;

[0009] The plug-in shaft is elastically connected to the outer sleeve through a spring; the plug-in shaft is plugged into the inner hole of the bearing; when the outer sleeve is away from the bearing, the plug-in shaft is separated from the bearing under the action of the spring;

[0010] The plug-in shaft is provided with an air outlet, and the outlet end thereof is connected to a flow meter;

[0011] The air inlet and the air outlet form a detection air passage; the detection air passage passes through the inner and outer sides of the lip seal ring in the bearing.

[0012] Before the bearing needs to be inspected, the bearing is first placed on the bottom plate, and then the lifting assembly is started to drive the outer sleeve down, sleeved on the outside of the bearing, and against the bottom plate. At this time, the plug-in shaft is inserted into the inner ring of the bearing; when the bearing is inspected and needs to be removed, the lifting assembly is started to drive the outer sleeve up, and the plug-in shaft automatically detaches from the bearing under the action of the spring; the above setting can realize the disassembly and assembly of the bearing through the lifting of the outer sleeve, which is simple, convenient, fast and efficient. When the bearing is inspected, the air inlet is inflated, and the flow meter detects the gas flow at the outlet of the air hole, and judges whether the sealing performance of the bearing meets the requirements based on the flow value.

[0013] During detection, the bearing is prone to axial movement, thus affecting the normal detection. Based on this, a further improvement is that a pressure tube is further provided in the outer sleeve, and its lower end abuts against the bearing.

[0014] In order to ensure that the pressing tube can accurately abut against the outer ring of the bearing, a further design is that the plug-in shaft is plugged into the pressing tube to achieve movement and guidance of the pressing tube.

[0015] When the pressure of the pressure pipe on the bearing is too large, the bearing will be damaged. Based on this, a further improvement is that the spring is sleeved on the plug-in shaft, and its two ends are respectively connected to the plug-in shaft and the pressure pipe. The technical effect of such a setting is:

[0016] 1. When the pressure of the pressure tube on the bearing is too great, the spring buffers and relieves the force by deformation, so that the pressure of the pressure tube on the bearing remains stable and avoids damage to the bearing; 2. When the bearing needs to be removed after inspection, the outer sleeve rises, and the sleeve still rests on the bearing under the action of the spring. The restoring force of the spring drives the plug-in shaft to rise and automatically disengage from the bearing.

[0017] In order to prevent the compression tube from falling off the lower end of the outer sleeve, a further design is that a first concave platform is provided on the inner wall of the outer sleeve, and a first clamping portion for clamping the first concave platform is provided on the compression tube.

[0018] In order to allow the gas to stably reach the lip seal ring, a distance is provided between the lower end of the pressure tube and the inner wall of the outer sleeve, thereby forming an air cavity; the air inlet is connected to the air cavity.

[0019] In order to achieve the installation and positioning of the plug-in shaft and convenient disassembly and assembly of the plug-in shaft and the outer sleeve, further improvements are: a second recess is provided at the upper end of the outer sleeve, and the plug-in shaft is provided with a second clamping portion for clamping the second recess; a pressure cover is also connected to the top of the outer sleeve for clamping and fixing the plug-in shaft.

[0020] When the plug-in shaft descends to the entrance of the air outlet and passes over the lip sealing ring, the lower end of the plug-in shaft will be lower than the bearing, and thus will be blocked by the bottom plate. Based on this, a further improvement is that a groove is provided on the bottom plate to provide the plug-in shaft with sufficient insertion depth.

[0021] When lip seals are provided on both sides of the bearing, the bearing abuts against the upper end surface of the bottom plate and covers the groove. Two parallel air paths are provided between the air cavity and the air outlet, one enters the bearing from the upper end of the bearing, passes through the lip seal at the upper end and extends to the frame position, and the other enters the bearing from the lower end of the bearing, passes through the lip seal at the lower end and extends to the frame position; the two air paths meet at the frame position and then connect to the air outlet.

[0022] When the bearing is provided with a lip seal ring only on one side, the lip seal ring is provided on the upper side; a seal block is placed in the groove; and the bearing is placed on the seal block. In this way, the lower end of the bearing is sealed inside and outside under the action of the seal block, and only one air path is provided between the air cavity and the air outlet. This air path enters the bearing from the upper end of the bearing, passes through the lip seal ring, extends to the frame position, and finally connects to the air outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] Figure 1 It is a front sectional view of the utility model, in which lip seals are provided on both sides of the bearing;

[0025] Figure 2 yes Figure 1 The enlarged view of point A in the middle;

[0026] Figure 3 It is a front sectional view of the utility model, in which the bearing is provided with a lip seal ring only on one side;

[0027] Figure 4 yes Figure 3 The enlarged view of point B in the middle;

[0028] Figure 5 It is the main sectional view of the splice shaft;

[0029] Figure 6 is a front cross-sectional view of the outer sleeve;

[0030] Figure 7 It is the main sectional view of the compression tube;

[0031] In the figure: 1, bottom plate; 2, bearing; 3, outer sleeve; 4, plug-in shaft; 5, spring; 6, pressure tube; 7, air cavity; 8, pressure cover; 9, sealing block; 11, groove; 21, lip seal; 22, skeleton; 31, air inlet; 32, first concave platform; 33, second concave platform; 34, first inner hole; 35, second inner hole; 36, third inner hole; 41, air outlet; 42, second clamping part; 43, second plug-in part; 44, third plug-in part; 61, first clamping part; 62, first plug-in part; 63, pressing part; 71, first seal ring; 72, second seal ring; 73, third seal ring; 81, through hole. DETAILED DESCRIPTION

[0032] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0033] Embodiment 1:

[0034] like Figure 1 and Figure 2 As shown, the utility model discloses a bearing airtightness detection device, which is used to detect the airtightness of a bearing 2. The bearing 2 includes a tubular housing, both ends of which are bent inward to form inner flanges. A frame 22 is arranged in the housing, and a needle roller is mounted on the frame 22. A lip seal ring 21 is arranged between one end of the frame 22 and one of the inner flanges, and two parallel lip seal rings 21 are arranged between the other end and the other inner flange.

[0035] The utility model comprises a bottom plate 1, and the upper end surface of the bottom plate 1 is provided with a groove 11. When the bearing 2 is detected, it is placed on the upper end surface of the bottom plate 1 and covers the groove 11.

[0036] The utility model further comprises a hollow outer sleeve 3 , the lower end surface of which is clamped with a first sealing ring 71 , which is used to achieve sealing when the lower end of the outer sleeve 3 abuts against the bottom plate 1 .

[0037] like Figure 6 As shown, the inner wall of the outer sleeve 3 is provided with a second concave platform 33 and a first concave platform 32 in sequence from top to bottom, thereby dividing the inner hole of the outer sleeve 3 into three sections, namely, a first inner hole 34, a second inner hole 35 and a third inner hole 36 with decreasing inner diameters in sequence from top to bottom.

[0038] The outer sleeve 3 is clamped with a plug-in shaft 4. Figure 5 As shown, the plug-in shaft 4 is provided with a second clamping portion 42, a second plug-in portion 43 and a third plug-in portion 44 which are connected in sequence and have decreasing radius from top to bottom. The second clamping portion 42 clamps the second concave platform 33, and the lower end of the third plug-in portion 44 passes through the inner ring of the bearing 2 and is inserted into the groove 11. The second plug-in portion 43 is inserted into the second inner hole 35, and the second inner hole 35 is clamped with a second sealing ring 72 to achieve sealing between the second plug-in portion 43 and the second inner hole 35.

[0039] The upper end of the outer sleeve 3 is connected with a gland 8, which is fixed by bolts. The second clamping portion 42 is clamped between the second concave platform 33 and the gland 8 to fix the plug-in shaft 4. The lower end surface of the gland 8 is clamped with a third sealing ring 73, which is sealed and connected to the plug-in shaft 4.

[0040] A pressure pipe 6 is also installed in the outer sleeve 3, specifically: Figure 7As shown, the pressure tube 6 is provided with a first clamping portion 61, a first plug-in portion 62 and a pressing portion 63 with decreasing diameters from top to bottom. The first clamping portion 61 clamps the first concave platform 32 to achieve position limiting, which is used to prevent the pressure tube 6 from falling from the lower end of the outer sleeve 3. The first plug-in portion 62 is inserted into the third inner hole 36 to achieve movement guidance. The pressing portion 63 abuts against the upper end of the bearing 2 housing to press the bearing 2 and improve the position stability of the bearing 2. A spacing is set between the pressing portion 63 and the third inner hole 36, thereby forming an air cavity 7.

[0041] The third plug-in portion 44 is plugged into the inner hole of the pressing tube 6 and is used to guide the movement of the pressing tube 6 so that the pressing tube 6 can be accurately pressed onto the housing of the bearing 2 .

[0042] The upper end of the third plug-in portion 44 is sleeved with a spring 5, so that the two ends of the spring 5 respectively abut against the upper end of the first clamping portion 61 and the lower end of the second plug-in portion 43. The spring 5 has the following two technical effects: 1. When the pressure of the pressure tube 6 on the bearing 2 is too large, the spring 5 buffers and releases the force by deformation, so that the pressure of the pressure tube 6 on the bearing 2 remains stable to avoid damage to the bearing 2; 2. When the bearing 2 needs to be removed after inspection, the outer sleeve 3 rises, and the sleeve still abuts against the bearing 2 under the action of the spring 5, and the restoring force of the spring 5 drives the plug-in shaft 4 to rise and automatically disengage from the bearing 2.

[0043] The plug-in shaft 4 is provided with an axial air outlet hole 41, which is a blind hole, and its upper end is connected to the outside. The pressure cover 8 is provided with an axial through hole 81, which is connected to the air outlet hole 41 and is in a coaxial arrangement. The upper end of the through hole 81 is used to connect a flow meter. The lower end of the air outlet hole 41 is vertically connected with four evenly distributed connecting holes, and the entrances of the connecting holes are opposite to the skeleton 22 and are located between the lip seals 21 on both sides of the bearing 2. The outer sleeve 3 is provided with a horizontally arranged air inlet hole 31 that passes through the inner and outer walls, and the air inlet hole 31 is connected to the air cavity 7. The air inlet hole 31 and the air outlet hole 41 constitute a detection air duct; the detection air duct passes through the inner and outer sides of the lip seal 21 in the bearing 2. Two parallel air paths are provided between the air cavity 7 and the connecting hole, one of which enters the bearing 2 from the upper end of the bearing 2, passes through the lip seal 21 at the upper end and extends to the position of the skeleton 22, and the other enters the bearing 2 from the lower end of the bearing 2, passes through the lip seal 21 at the lower end and extends to the position of the skeleton 22; the two air paths merge at the position of the skeleton 22 and then connect to the air outlet 41.

[0044] The outer sleeve 3 is driven to move up and down by a lifting assembly, which may be, but is not limited to, a cylinder, or a linear slide.

[0045] Before the bearing 2 needs to be inspected, the bearing 2 is first placed on the base plate 1, and then the lifting assembly is started to drive the outer sleeve 3 to descend. During the descent process, the third plug-in portion 44 is first inserted into the inner ring of the bearing 2, and then the pressure tube 6 is pressed against the upper end of the shell; as the outer sleeve 3 continues to descend, the position of the pressure tube 6 remains unchanged, and the spring 5 is compressed until the outer sleeve 3 is pressed against the base plate 1, at which time the third plug-in portion 44 penetrates the inner ring of the bearing 2. When the bearing 2 is inspected and needs to be removed, the lifting assembly is started to drive the outer sleeve 3 to rise, and the plug-in shaft 4 automatically detaches from the bearing 2 under the action of the spring 5; the above-mentioned setting can realize the disassembly and assembly of the bearing 2 by lifting the outer sleeve 3, which is simple, convenient, fast and efficient. When the bearing 2 is inspected, the air inlet 31 is inflated, and the flowmeter detects the gas flow at the outlet of the air hole 41, and judges whether the sealing performance of the bearing 2 meets the requirements based on the flow value.

[0046] Embodiment 2:

[0047] Compared with the first embodiment, the difference is: Figure 3 and Figure 4 As shown, only one side of the bearing 2 is provided with two lip seals 21 arranged in parallel. When the bearing 2 is installed, the lip seal 21 is located at the upper end.

[0048] A sealing block 9 is installed in the groove 11, and the bearing 2 is placed on the upper end of the sealing block 9. When the pressure pipe 6 applies pressure to the bearing 2, the inner and outer sides of the lower end of the bearing 2 are sealed under the action of the sealing block 9. Therefore, there is only one air path between the air cavity 7 and the connecting hole, which enters the bearing 2 from the upper end of the bearing 2, passes through the lip seal ring 21, and extends to the position of the frame 22, and finally connects to the air outlet 41.

[0049] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A bearing air tightness detection device, characterized in that: include: A bottom plate (1) for placing a bearing (2) to be tested; An outer sleeve (3) is driven to rise and fall by a lifting assembly to be sleeved on or away from the bearing (2), and an air inlet hole (31) penetrating the inner and outer walls of the outer sleeve (3) is provided; The plug-in shaft (4) is elastically connected to the outer sleeve (3) via a spring (5); the plug-in shaft (4) is plugged into the inner hole of the bearing (2); when the outer sleeve (3) is away from the bearing (2), the plug-in shaft (4) automatically disengages from the bearing (2) under the action of the spring (5); The plug-in shaft (4) is provided with an air outlet (41), the outlet end of which is connected to a flow meter; The air inlet (31) and the air outlet (41) form a detection air passage; the detection air passage passes through the inside and outside of the lip seal ring (21) in the bearing (2).

2. The bearing air tightness detection device according to claim 1 is characterized in that: A pressure tube (6) is also provided inside the outer sleeve (3), and the lower end of the pressure tube abuts against the bearing (2).

3. The bearing air tightness detection device according to claim 2 is characterized in that: The plug-in shaft (4) is plugged into the pressing tube (6) to achieve movement and guidance of the pressing tube (6).

4. The bearing airtightness detection device according to claim 3 is characterized in that: The spring (5) is sleeved on the plug-in shaft (4), and its two ends are respectively connected to the plug-in shaft (4) and the pressure tube (6).

5. The bearing airtightness detection device according to claim 4 is characterized in that: The inner wall of the outer sleeve (3) is provided with a first concave platform (32), and the pressing tube (6) is provided with a first clamping portion (61) clamped with the first concave platform (32).

6. The bearing airtightness detection device according to claim 5, characterized in that: A gap is provided between the lower end of the pressure tube (6) and the inner wall of the outer sleeve (3), thereby forming an air cavity (7); The air inlet hole (31) is in communication with the air cavity (7).

7. The bearing airtightness detection device according to claim 1, characterized in that: The upper end of the outer sleeve (3) is provided with a second concave platform (33), and the plug-in shaft (4) is provided with a second clamping portion (42) clamped with the second concave platform (33); The top of the outer sleeve (3) is also connected to a pressure cover (8) for pressing and fixing the plug-in shaft (4).

8. The bearing airtightness detection device according to claim 1, characterized in that: The bottom plate (1) is provided with a groove (11) for providing a sufficient insertion depth for the plug-in shaft (4).

9. The bearing airtightness detection device according to claim 8, characterized in that: Lip-shaped sealing rings (21) are provided on both sides of the bearing (2); The bearing (2) abuts against the upper end surface of the base plate (1) and covers the groove (11).

10. The bearing airtightness detection device according to claim 8, characterized in that: The bearing (2) is provided with a lip seal ring (21) only on one side, and the lip seal ring (21) is provided on the upper side; A sealing block (9) is placed in the groove (11); The bearing (2) is placed on a sealing block (9).

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