A method for testing the pressure of a hot strip mill backup roll chock

Abstract

The application discloses a kind of hot continuous rolling machine supporting roller bearing seat pressure test methods, steps are as follows: S1, annular pressing tool is designed, is installed in the oil groove of the inner hole of bearing seat, is used to plugging for oil groove, after pressure medium is passed in, annular pressing tool outer circumferential surface is evenly subjected to radial force;S2, test cover one is designed, is installed in the inner hole of bearing seat end face oil groove, is used to plugging for end face oil groove;S3, test cover two and test cover three are designed, are installed in two oil holes;S4, after all tools are installed, exhaust is carried out to oil circuit then plugging, then pressure test is carried out.The application designs annular pressing tool, evenly acts hydraulic pressure generated by test on annular pressing tool outer circumferential surface, so that the resultant force of hydraulic pressure that it is subjected to is zero, solve the problem that bearing seat inner hole big pressure test is difficult, tool structure is simple, convenient to operate, production cost is low, and pressure test result is stable and reliable, improves detection efficiency.

Description

Technical Field

[0001] This invention relates to the field of pressure testing technology, and in particular to a pressure testing method for a hot continuous rolling mill support roll bearing housing. Background Technology

[0002] After the support roller bearing housing is assembled, an oil film bearing is installed in the inner hole. The bearing housing 1 is designed with an oil passage for supplying oil or other cooling media. The oil passage is a structure in which two axially elongated oil holes 1-2 communicate with the inner hole oil groove 1-3 and the end face oil groove 1-4. See Figure 1 and Figure 3 As shown; the end face oil groove 1-4 is a welding oil cavity, which communicates with the inner hole 1-1, see Figure 2 As shown. Because the bearing housing is made of cast steel and the oil circuit contains welded structures, a pressure test is required for the oil circuit of the bearing housing. During the pressure test, all holes or openings in the oil circuit are usually sealed with test caps, and then pressure medium is introduced to check for any leakage of pressure medium and whether the test pressure remains stable without decreasing.

[0003] Because the inner diameter of the support roller bearing housing is relatively large, even reaching φ1610mm, if the inner holes at both ends of the bearing housing are sealed with a test cover and a pressure test is conducted, the hydraulic pressure acting on the test cover will be very large. The test cover needs to be designed to be very thick, and the clamping bolts of the test cover cannot withstand the corresponding axial force.

[0004] Therefore, there is an urgent need to provide a pressure testing method that can solve the difficulties of high pressure testing in the inner bore of bearing housings. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a pressure test method for the bearing housing of a hot continuous rolling mill support roll. This pressure test method employs a specially designed pressure-pressing fixture for the inner hole of the bearing housing. The pressure-pressing fixture is designed as a ring, and the hydraulic pressure generated during the test is uniformly applied along the circumference to the outer circumferential surface of the ring-shaped pressure-pressing fixture, so that the resultant force of the hydraulic pressure on the pressure-pressing fixture is zero, thereby solving the problem of the difficulty in conducting high-pressure tests on the inner hole of the bearing housing.

[0006] This invention is implemented as follows: a method for testing the pressure of a support roll bearing seat in a hot strip mill, comprising the following steps:

[0007] S1. Design an annular pressure-pressing fixture, install the annular pressure-pressing fixture in the inner hole of the bearing housing oil groove, the outer wall of the annular pressure-pressing fixture and the inner wall of the bearing housing are respectively sealed on both sides of the inner hole oil groove along the axial direction of the bearing housing, and form an annular closed cavity between the two seals. The annular pressure-pressing fixture is used to block the inner hole oil groove of the bearing housing, so that after the pressure medium is introduced, the outer circumferential surface of the annular pressure-pressing fixture is uniformly subjected to radial force.

[0008] S2. Design a test pressure cover one, and install the test pressure cover one in the inner hole of the oil groove at the end face of the bearing seat. The test pressure cover one is used to seal the oil groove at the end face of the bearing seat.

[0009] S3. Design a pressure test cover 2 and a pressure test cover 3. Install the pressure test cover 2 and the pressure test cover 3 in the two oil holes of the bearing housing respectively. The pressure test cover 2 and the pressure test cover 3 are used to seal the two oil holes of the bearing housing respectively. The pressure test cover 2 is provided with an exhaust threaded hole in the middle, and the pressure test cover 3 is provided with a pressure medium threaded hole in the middle.

[0010] After the S4 ring pressure testing fixture, pressure test cover one, pressure test cover two, and pressure test cover three are installed, the entire oil circuit of the bearing housing is sealed. Then, connect the pressure medium threaded hole of pressure test cover three to the pressure gauge and the pressure testing pump station. Then, vent the entire oil circuit of the bearing housing. After venting, apply sealant around a plug and seal it at the vent threaded hole. Then, perform a pressure test on the bearing housing to check for leaks in the bearing housing and each pressure test cover, and check for pressure drop on the pressure gauge. It is considered qualified when there is no leakage and the pressure drop is within 2%.

[0011] In the above technical solution, preferably, the annular pressing fixture includes a pressing ring and a mounting base. The pressing ring has a circular structure, and a sealing groove is provided on the outer circumferential surface at both ends of the bearing housing along the axial direction. An O-ring is provided in the sealing groove to seal the pressing ring and the bearing housing on both sides of the inner hole oil groove. The pressing ring is recessed inward by 1-2 mm on the outer circumferential surface corresponding to the inner hole oil groove, so that the outer wall of the pressing ring and the inner hole of the bearing housing form a circumferential closed cavity between the two seals. The mounting base is circumferentially mounted on the end face of one end of the pressing ring, and the annular pressing fixture is mounted in the inner hole of the bearing housing at the inner hole oil groove through the mounting base.

[0012] In the above technical solution, preferably, the test pressure cover one is provided with sealing groove two on the outer circumferential surface at both ends of the bearing seat along the axial direction, and an O-ring two is provided in the sealing groove two to seal the test pressure cover one with the bearing seat on both sides of the end face oil groove.

[0013] In the above technical solution, preferably, the second test cover has a convex-shaped structure, and a sealing groove is provided on the small diameter end face of the second test cover. An O-ring is provided in the sealing groove to seal the second test cover with the oil hole.

[0014] In the above technical solution, preferably, the test pressure cover three has a convex-shaped structure, and a sealing groove four is provided on the small diameter end face of the test pressure cover three. An O-ring four is provided in the sealing groove four to seal the test pressure cover three with the oil hole.

[0015] The advantages and positive effects of this invention are:

[0016] The pressure testing method of the present invention has a simple tooling structure, is easy to operate, has low manufacturing cost, and provides stable and reliable pressure test results, thereby improving testing efficiency. A special annular pressure testing fixture for the inner hole of the bearing housing is designed to apply the hydraulic pressure generated by the test evenly along the circumference to the outer circumferential surface of the annular pressure testing fixture, so that the resultant force of the hydraulic pressure on the pressure testing fixture is zero, thereby solving the problem of difficult high-pressure testing of the inner hole of the bearing housing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the bearing housing provided in an embodiment of the present invention;

[0018] Figure 2 for Figure 1 AA section view;

[0019] Figure 3 for Figure 1 BB cross-sectional view;

[0020] Figure 4 This is a schematic diagram of the bearing housing after installing the annular pressure testing fixture and the test cover according to an embodiment of the present invention;

[0021] Figure 5 A perspective view of the annular pressing fixture provided in an embodiment of the present invention;

[0022] Figure 6 This is a front view of the annular pressing fixture provided in an embodiment of the present invention;

[0023] Figure 7 This is a side view of the annular pressing fixture provided in an embodiment of the present invention;

[0024] Figure 8 for Figure 7 Enlarged view of the middle L section;

[0025] Figure 9 This is a perspective view of the test pressure cover provided in an embodiment of the present invention;

[0026] Figure 10 This is a front view of a test pressure cover provided in an embodiment of the present invention;

[0027] Figure 11 This is a side view of a test pressure cover provided in an embodiment of the present invention;

[0028] Figure 12 for Figure 11 Enlarged view of the middle M section;

[0029] Figure 13 This is a schematic diagram of the structure of the test pressure cover II provided in an embodiment of the present invention;

[0030] Figure 14 This is a schematic diagram of the structure of the test pressure cover three provided in an embodiment of the present invention.

[0031] In the diagram: 1. Bearing housing; 1-1. Inner hole; 1-2. Oil hole; 1-3. Inner hole oil groove; 1-4. End face oil groove; 2. Annular pressure testing fixture; 2-1. Pressure testing ring; 2-2. Mounting seat; 2-3. Sealing groove one; 2-4. O-ring one; 2-5. Circumferential closed cavity; 3. Test pressure cover one; 3-1. Sealing groove two; 3-2. O-ring two; 4. Test pressure cover two; 4-1. Vent threaded hole; 4-2. Sealing groove three; 5. Test pressure cover three; 5-1. Threaded hole for pressure medium; 5-2. Sealing groove four. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Example

[0036] Please see Figures 4 to 14 The present invention provides a method for testing the pressure of a support roll bearing seat in a hot strip mill, comprising the following steps:

[0037] S1, such as Figures 5-8As shown, an annular pressure fixture 2 is designed. The annular pressure fixture 2 is installed in the inner hole 1-1 of the inner hole oil groove 1-3 of the bearing seat 1. The outer wall of the annular pressure fixture 2 and the inner hole wall of the bearing seat 1 are respectively sealed on both sides of the inner hole oil groove 1-3 along the axial direction of the bearing seat 1, and a circumferential closed cavity 2-5 is formed between the two seals. This cavity is used to block the inner hole oil groove 1-3 of the bearing seat 1, so that after the pressure medium is introduced, the outer circumferential surface of the annular pressure fixture 2 is uniformly subjected to radial force.

[0038] Specifically, the annular pressing fixture 2 includes a pressing ring 2-1 and a mounting base 2-2. The pressing ring 2-1 has a circular structure. The pressing ring 2-1 has sealing grooves 2-3 on the outer circumferential surface at both ends of the bearing housing 1 along the axial direction. An O-ring 2-4 is provided in the sealing groove 2-3 to seal the pressing ring 2-1 and the bearing housing 1 on both sides of the inner hole oil groove 1-3. The pressing ring 2-1 is recessed inward by 1-2 mm on the outer circumferential surface corresponding to the inner hole oil groove 1-3, so that the outer wall of the pressing ring 2-1 and the inner hole 1-1 of the bearing housing 1 form a circumferential closed cavity 2-5 between the two seals. The mounting base 2-2 is circumferentially mounted on the end face of one end of the pressing ring 2-1. The annular pressing fixture 2 is installed in the inner hole 1-1 of the inner hole oil groove 1-3 of the bearing housing 1 through the mounting base 2-2. In this embodiment, the outer wall of the pressure ring 2-1 is provided with a step at the end away from the mounting base 2-2, and a sealing groove 2-3 is provided at this step. This step cooperates with the inner wall of the inner hole 1-1 at the inner hole oil groove 1-3 of the bearing seat 1.

[0039] S2, such as Figures 9-12 As shown, a test pressure cover 3 is designed. The test pressure cover 3 is installed in the inner hole 1-1 at the oil groove on the end face of the bearing seat 1, and is used to seal the oil groove 1-4 on the end face of the bearing seat 1.

[0040] Specifically, the test pressure cover 3 has sealing grooves 3-1 on the outer circumferential surface at both ends of the bearing housing 1 along the axial direction. O-rings 3-2 are installed in the sealing grooves 3-1 to seal the test pressure cover 3 against the bearing housing 1 on both sides of the end face oil groove 1-4. In this embodiment, the outer circumferential surface of the test pressure cover 3 has two steps, and the two sealing grooves 3-1 are respectively located at the two steps. The two steps mate with the inner hole 1-1 at the end face oil groove 1-4 of the bearing housing 1.

[0041] S3, such as Figure 13 and Figure 14As shown, a second pressure test cover 4 and a third pressure test cover 5 are designed. The second pressure test cover 4 and the third pressure test cover 5 are respectively installed in the two oil holes 1-2 of the bearing housing 1. The second pressure test cover 4 and the third pressure test cover 5 are respectively used to seal the two oil holes 1-2 of the bearing housing 1. The second pressure test cover 4 is provided with an exhaust threaded hole 4-1 in the middle, and the third pressure test cover 5 is provided with a pressure medium threaded hole 5-1 in the middle.

[0042] Specifically, both the second test cover 4 and the third test cover 5 have a convex shape. The second test cover 4 has a sealing groove 4-2 on its small diameter end face, and an O-ring is installed in the sealing groove 4-2 to seal the second test cover 4 with the oil hole 1-2. The third test cover 5 has a sealing groove 5-2 on its small diameter end face, and an O-ring is installed in the sealing groove 5-2 to seal the third test cover 5 with the oil hole 1-2.

[0043] After S4, ring pressure testing fixture 2, pressure test cover 1 3, pressure test cover 2 4, and pressure test cover 3 5 are installed, the entire oil circuit of bearing housing 1 is sealed. Then, connect the pressure medium threaded hole 5-1 of pressure test cover 3 5 to the pressure gauge and the pressure testing pump station. Then, vent the entire oil circuit of bearing housing 1. After venting, apply sealant around a plug and seal it at the vent threaded hole 4-1. Then, perform a pressure test on bearing housing 1 to check for leaks in bearing housing 1 and each pressure test cover, and check for pressure drop on the pressure gauge. It is considered qualified when there is no leakage and the pressure drop is within 2%.

[0044] The following describes the specific implementation process of the present invention using a bearing housing 1 with a diameter of φ1610mm as an example:

[0045] (1) Figure 1 The bearing housing 1 is placed horizontally on the shim according to the bearing bore. An O-ring 2-4 is installed in the sealing groove 2-3 of the pressure ring 2-1. Then, the annular pressure fixture 2 is installed through the mounting base 2-2 into the inner hole 1-1 at the inner oil groove 1-3 of the bearing housing 1. This seals the φ1610mm (+0.2 / 0) and φ1550mm (+0.12 / 0) inner holes 1-1 at both ends of the 236mm wide inner oil groove 1-3. (See...) Figure 4 As shown.

[0046] (2) Install O-ring 3-2 in the sealing groove 3-1 of the test pressure cover 3. Then install the test pressure cover 3 in the inner hole 1-1 at the oil groove 1-4 on the end face of the bearing housing 1. The O-ring 3-2 at the φ1550mm outer diameter of the test pressure cover 3 blocks the φ1550mm (+0.12 / 0) inner hole 1-1 of the bearing housing 1. The O-ring 3-2 at the φ1650mm outer diameter of the test pressure cover 3 blocks the φ1650mm (+0.12 / 0) inner hole 1-1 of the bearing housing 1. See Figure 4 As shown.

[0047] (3) Install O-ring 3 in the sealing groove 4-2 of the second pressure cover 4, and install O-ring 4 in the sealing groove 5-2 of the fourth pressure cover 4. The second pressure cover 4 and the third pressure cover 5 are respectively installed on the two φ140mmH8 oil holes on the bearing seat 1 to block the two φ108 oil holes of the bearing seat 1.

[0048] (4) After all the above tools are installed, the entire oil circuit of bearing housing 1 is sealed. Then, connect the pressure gauge and the pressure pump station to the pressure medium threaded hole 5-1 of the pressure test cover 35. Then, vent the entire oil circuit of bearing housing 1. After venting, apply sealant around the plug and seal it at the vent threaded hole 4-1. Then, perform a pressure test on bearing housing 1. Check bearing housing 1 and each pressure test cover for leaks, and check the pressure gauge for pressure drop. No leaks and a pressure drop within 2% are acceptable.

[0049] In summary, the pressure testing method of the present invention has a simple tooling structure, is easy to operate, has low manufacturing cost, and provides stable and reliable pressure test results, thereby improving testing efficiency. The design of a special annular pressure testing fixture 2 for the inner hole of the bearing housing 1 applies the hydraulic pressure generated by the test evenly along the circumference to the outer circumferential surface of the annular pressure testing fixture 2, making the resultant force of the hydraulic pressure on the pressure testing fixture zero, thus solving the problem of difficult high-pressure testing of the inner hole of the bearing housing 1.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for testing the pressure of a support roll bearing seat in a hot continuous rolling mill, characterized in that: Includes the following steps: S1. Design an annular pressure-pressing fixture, which is installed in the inner hole of the bearing housing's inner bore oil groove. The outer wall of the annular pressure-pressing fixture and the inner wall of the bearing housing are respectively sealed on both sides of the inner bore oil groove along the bearing housing's axial direction, forming a circumferential closed cavity between the two seals. The annular pressure-pressing fixture is used to seal the inner bore oil groove of the bearing housing, so that after the pressure medium is introduced, the outer circumferential surface of the annular pressure-pressing fixture is uniformly subjected to radial force. The annular pressure-pressing fixture includes a pressure ring and a mounting base, wherein the pressure ring has a circular ring structure. The pressure ring has a sealing groove on the outer circumferential surface at both ends of the bearing housing along the axial direction. An O-ring is installed in the sealing groove to seal the pressure ring and the bearing housing on both sides of the inner hole oil groove. The pressure ring is recessed inward by 1-2mm on the outer circumferential surface corresponding to the inner hole oil groove, so that the outer wall of the pressure ring and the inner hole of the bearing housing form a circumferential closed cavity between the two seals. The mounting base is installed circumferentially on the end face of one end of the pressure ring. The annular pressure tool is installed in the inner hole of the bearing housing at the inner hole oil groove through the mounting base. S2. Design a test pressure cover 1 and install the test pressure cover 1 in the inner hole of the oil groove at the end face of the bearing seat. The test pressure cover 1 is used to seal the oil groove at the end face of the bearing seat. The test pressure cover 1 is provided with sealing grooves 2 on the outer circumferential surface at both ends of the bearing seat along the axial direction. O-rings 2 are provided in the sealing grooves 2 to seal the test pressure cover 1 and the bearing seat on both sides of the oil groove at the end face. S3. Design a pressure test cover 2 and a pressure test cover 3, and install the pressure test cover 2 and the pressure test cover 3 in the two oil holes of the bearing housing. The pressure test cover 2 and the pressure test cover 3 are used to seal the two oil holes of the bearing housing respectively. The pressure test cover 2 is provided with an exhaust threaded hole in the middle, and the pressure test cover 3 is provided with a pressure medium threaded hole in the middle. After the S4 ring pressure testing fixture, pressure test cover one, pressure test cover two, and pressure test cover three are installed, the entire oil circuit of the bearing housing is sealed. Then, connect the pressure medium threaded hole of pressure test cover three to the pressure gauge and the pressure testing pump station. Then, vent the entire oil circuit of the bearing housing. After venting, apply sealant around a plug and seal it at the vent threaded hole. Then, perform a pressure test on the bearing housing to check for leaks in the bearing housing and each pressure test cover, and check for pressure drop on the pressure gauge. It is considered qualified when there is no leakage and the pressure drop is within 2%.

2. The method for testing the pressure of the support roll bearing seat of a hot strip mill according to claim 1, characterized in that: The second test cover has a convex shape. A sealing groove is provided on the small diameter end face of the second test cover. An O-ring is provided in the sealing groove to seal the second test cover with the oil hole.

3. The method for testing the pressure of the support roll bearing housing of a hot strip mill according to claim 1, characterized in that: The test pressure cover three has a convex-shaped structure. A sealing groove four is provided on the small diameter end face of the test pressure cover three. An O-ring four is provided in the sealing groove four to seal the test pressure cover three with the oil hole.

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