A scaled-down test fixture and scaled-down test device for lip seal ring of shield machine

Abstract

The present invention relates to a scaled-down test fixture and scaled-down test device for a lip seal ring of a shield machine. The scaled-down test fixture for the lip seal ring of a shield machine comprises a first pressure plate and a second pressure plate stacked together with the first pressure plate and detachably fixedly connected, at least one of the first pressure plate and the second pressure plate is provided with an annular groove, the notch of the annular groove faces the stacking direction of the first pressure plate and the second pressure plate, so as to enclose a sealing ring installation cavity for clamping the lip seal ring after the first pressure plate and the second pressure plate are fixed, and the sealing ring installation cavity has an extension opening for the lip of the lip seal ring to extend out of the sealing ring installation cavity; the first pressure plate and the second pressure plate are both annular plates used to be sleeved on the outer periphery of a test shaft so that the lip of the lip seal ring is sealed with the outer peripheral surface of the test shaft; the test fixture also comprises an end cover, which is used to be fixedly connected with the first pressure plate or the second pressure plate to form a grease cavity between the test shaft, and the grease cavity is used to store lubricant for lubricating the lip seal ring.

Description

Technical Field

[0001] The invention relates to the technical field of shield machine main drive sealing performance detection test, and in particular to a shield machine lip seal ring reduction test device. Background Art

[0002] During the tunneling process of the shield machine, the main drive device drives the cutter disc to rotate, and the cutter of the cutter disc cuts the rock. In order to prevent the debris from entering the main drive device, a sealing device is provided. For example, a TBM and its main drive device disclosed in the Chinese patent with the authorization announcement number CN214464195U, the main drive device includes a fixed part and a rotating part rotatably mounted on the fixed part, and the fixed part and the rotating part are arranged at intervals to form an annular cavity, wherein the first lip seal ring, the second lip seal ring and the third lip seal ring are arranged in sequence from front to back between the fixed part and the rotating part, a grease cavity is formed between the first lip seal ring and the second lip seal ring, and a detection cavity is formed between the second lip seal ring and the third lip seal ring. Among them, the lip of the first lip seal ring is arranged to face away from the grease cavity, so that the lip seal ring is reversed, and the lip of the second lip seal ring is arranged to face the grease cavity, so that the lip seal ring is normal, and there is a difference in the sealing performance between the normal state of the lip seal ring and the reverse state of the lip seal ring. The front side of the first lip seal ring and the fixed part and the rotating part cooperate to form a cavity connected to the excavation chamber. When in use, grease is continuously injected into the grease cavity. After a certain pressure is formed in the grease cavity, the grease pushes the first lip seal ring forward, so that the grease can flow forward from the lip of the first lip seal ring, thereby preventing impurities in the cavity from entering the grease cavity and ensuring effective sealing. At the same time, the second lip seal ring blocks the grease from flowing backward into the detection cavity. Since the lip seal ring cannot be replaced during the construction process, it is particularly important to analyze the sealing performance of the lip seal ring during the design stage.

[0003] The shield machine main drive sealing performance test tooling in the Chinese patent document with the existing authorization announcement number CN208953219U is used to seal and fix the tooling sealing ring to the main drive rotating body between the soil bin outer sealing flange and the soil bin inner sealing wear-resistant ring. The outer sealing flange of the soil bin and the main drive rotating body form an outer sealing cavity of the main drive outer seal, and the inner sealing wear-resistant ring of the soil bin and the main drive rotating body form an inner sealing cavity of the main drive inner seal. Five lip-shaped sealing rings are arranged in the inner and outer seals of the main drive, and a sealed chamber is formed between any two adjacent lip-shaped sealing rings. When testing the inner and outer seals of the main drive, first, all the oil filling holes on the main drive rotating body corresponding to each cavity of the inner and outer seals of the main drive are blocked with a screw plug. The screw plug of the chamber to be tested is unscrewed, and the compressed air is connected to maintain the pressure. The sealing performance of the inner and outer seals of the main drive is tested by measuring the pressure in the inner and outer sealing cavities and the outer sealing cavity.

[0004] The above-mentioned shield machine main drive sealing performance detection test fixture adopts a lip-shaped sealing ring used in actual working conditions. However, the size of the shield machine main drive sealing ring is generally 2 to 3 meters. The sealing ring size is too large, and it is technically difficult to build a test bench for sealing performance testing, resulting in a more complex structure of the test fixture and higher cost. Summary of the invention

[0005] The purpose of the present invention is to provide a scaled test fixture for a shield machine lip seal ring, so as to solve the technical problem in the prior art that the structure of the test fixture is relatively complex and the cost is relatively high when the lip seal ring in actual working conditions is used for testing. The purpose of the present invention is also to provide a scaled test device.

[0006] To achieve the above-mentioned purpose, the technical solution of the shield machine lip seal ring reduction test fixture of the present invention is:

[0007] A scaled-down test fixture for the lip seal of a shield machine comprises a first pressure plate and a second pressure plate which is stacked together with the first pressure plate and detachably fixedly connected. At least one of the first pressure plate and the second pressure plate is provided with an annular groove, and the notch of the annular groove faces the stacking direction of the first pressure plate and the second pressure plate, so as to form a sealing ring installation cavity for clamping the lip seal after the first pressure plate and the second pressure plate are fixed, and the sealing ring installation cavity has an extension opening for the lip of the lip seal to extend out of the sealing ring installation cavity; the first pressure plate and the second pressure plate are both annular plates for being mounted on the outer periphery of a test shaft so that the lip of the lip seal is sealed with the outer peripheral surface of the test shaft; the scaled-down test fixture for the lip seal of a shield machine also comprises an end cover, which is used to be fixedly connected to the first pressure plate or the second pressure plate to form a grease cavity between the test shaft, and the grease cavity is used to store lubricant for lubricating the lip seal.

[0008] The beneficial effect is that in the shield machine lip seal ring reduction test fixture of the present invention, the seal ring installation cavity surrounded by the fixed connection between the first pressure plate and the second pressure plate clamps the lip seal ring, and the lip of the lip seal ring extends from the extension port of the seal ring installation cavity to cooperate with the test shaft seal, and the lubricant stored in the grease cavity inside the fixture lubricates the lip seal ring to simulate the actual working condition of the lip seal ring. The lip seal ring is a scaled-down part of the lip seal in the actual working condition after being proportionally reduced, and the size is relatively small, and the size of the required fixture is small. The shield machine lip seal ring reduction test fixture clamps the lip seal ring through two pressure plates, and the overall structure is simple, easy to clean and load and unload, easy to process, and low in cost.

[0009] Further improvement, the shield machine lip seal scale test fixture has a lip seal normal installation state and a lip seal reverse installation state, when the lip seal is normal installation, the second pressure plate is between the end cover and the first pressure plate, when the lip seal is reverse installation, the first pressure plate is between the end cover and the second pressure plate.

[0010] The beneficial effect is that by such a design, by exchanging the assembly positions of the first pressure plate and the second pressure plate, the forward installation and reverse installation of the lip seal ring can be completed without changing the clamp, thereby reducing the number of clamps and significantly reducing costs.

[0011] Further improvement, the first pressure plate is provided with a bolt through hole extending along the axial direction of the first pressure plate, the end cover is provided with an end cover through hole corresponding to the bolt through hole, the second pressure plate is provided with a pressure plate threaded hole corresponding to the bolt through hole and an end cover threaded hole corresponding to the end cover through hole, when the lip seal ring is installed properly, the first fixing bolt passes through the bolt through hole and is threadedly connected to the pressure plate threaded hole to fix the first pressure plate and the second pressure plate, the second fixing bolt passes through the end cover through hole and is threadedly connected to the end cover threaded hole to fix the second pressure plate and the end cover; when the lip seal ring is installed in reverse, the third fixing bolt passes through the end cover through hole, the bolt through hole and the pressure plate threaded hole to be threadedly connected to fix the end cover, the first pressure plate and the second pressure plate.

[0012] The beneficial effect is that with this design, the end cover, the first pressure plate and the second pressure plate are detachably fixedly connected by bolts, which is beneficial to ensuring the connection strength.

[0013] Further improvement, the second pressure plate is provided with a bolt through hole extending along the axial direction of the second pressure plate, the end cover is provided with an end cover through hole corresponding to the bolt through hole, the first pressure plate is provided with a pressure plate threaded hole corresponding to the bolt through hole and an end cover threaded hole corresponding to the end cover through hole, when the lip seal ring is installed upright, the third fixing bolt passes through the end cover through hole, the bolt through hole and the pressure plate threaded hole are threadedly connected to fix the end cover, the second pressure plate and the first pressure plate; when the lip seal ring is installed in reverse, the first fixing bolt passes through the bolt through hole and is threadedly connected to the pressure plate threaded hole to fix the second pressure plate and the first pressure plate, and the second fixing bolt passes through the end cover through hole and is threadedly connected to the end cover threaded hole to fix the first pressure plate and the end cover.

[0014] The beneficial effect is that with this design, the end cover, the first pressure plate and the second pressure plate are detachably fixedly connected by bolts, which is beneficial to ensuring the connection strength.

[0015] As a further improvement, an oil filling hole for injecting lubricant into the grease cavity is provided on the top surface of the end cover.

[0016] The beneficial effects are: the size of the oil injection hole is small, which reduces the contact area between the grease cavity and the external environment, and reduces the possibility of the lubricant in the grease cavity flowing into the outside through the oil injection hole.

[0017] As a further improvement, an annular protrusion for fitting with the lip seal ring is provided on the end face of the first pressure plate, and the annular groove is provided on the second pressure plate so that the protruding opening of the seal ring installation cavity faces away from the first pressure plate.

[0018] The beneficial effect is that: with this design, the sealing ring installation cavity is closer to the actual installation condition of the lip sealing ring.

[0019] As a further improvement, an O-ring is installed on the end surface of one end of the end cover that contacts the first pressure plate or the second pressure plate.

[0020] The beneficial effect is that such a design can prevent the grease in the grease cavity from leaking into the external environment along the radial direction of the end cover, thereby avoiding environmental pollution.

[0021] As a further improvement, the shield machine lip seal ring reduction test fixture also includes a threaded plug, and the oil filling hole is a threaded hole that cooperates with the thread of the threaded plug.

[0022] The beneficial effect is that: with this design, the sealing performance of the thread plug and the oil filling port is strong, which is conducive to ensuring the sealing performance of the shield machine lip seal ring reduction test fixture.

[0023] As a further improvement, at least one of the first pressure plate and the second pressure plate is provided with a groove on the outer periphery for fixing a scaled-down test fixture of the shield machine lip seal ring.

[0024] The beneficial effect is that: with such a design, the top screw is pushed into the card slot to realize the disassembly and assembly of the shield machine lip seal ring reduction test fixture, the structure is simple, and it is easy to realize.

[0025] To achieve the above object, the technical solution of the scaled test device of the present invention is:

[0026] A scaled-down test device comprises a test shaft and a scaled-down test fixture for the lip seal of a shield machine which is sleeved on the test shaft. The scaled-down test fixture for the lip seal of a shield machine comprises a first pressure plate and a second pressure plate which is stacked together with the first pressure plate and detachably fixedly connected. At least one of the first pressure plate and the second pressure plate is provided with an annular groove, and the notch of the annular groove faces the stacking direction of the first pressure plate and the second pressure plate, so as to form a sealing ring installation cavity for clamping the lip seal after the first pressure plate and the second pressure plate are fixed, and the sealing ring installation cavity has an extension opening for the lip of the lip seal to extend out of the sealing ring installation cavity; both the first pressure plate and the second pressure plate are annular plates which are sleeved on the outer periphery of the test shaft so that the lip of the lip seal is sealed with the outer peripheral surface of the test shaft; the scaled-down test fixture for the lip seal of a shield machine also comprises an end cover, which is used to be fixedly connected with the first pressure plate or the second pressure plate to form a grease cavity between the test shaft, and the grease cavity is used to store lubricant for lubricating the lip seal.

[0027] The beneficial effect is that in the scaled test device of the present invention, the shield machine lip seal ring scaled test fixture is set on the outer periphery of the test shaft, and the first pressure plate and the second pressure plate in the shield machine lip seal ring scaled test fixture are fixedly connected to clamp the lip seal ring, so that the lip of the lip seal ring is closely attached to the outer peripheral surface of the test shaft, and the lip seal ring and the rotating test shaft are relatively rotated to simulate the actual working condition of the lip seal ring in the shield, thereby obtaining test data. The entire test device has a simple structure and low operation difficulty.

[0028] Further improvement, the shield machine lip seal scale test fixture has a lip seal normal installation state and a lip seal reverse installation state, when the lip seal is normal installation, the second pressure plate is between the end cover and the first pressure plate, when the lip seal is reverse installation, the first pressure plate is between the end cover and the second pressure plate.

[0029] The beneficial effect is that by such a design, by exchanging the assembly positions of the first pressure plate and the second pressure plate, the forward installation and reverse installation of the lip seal ring can be completed without changing the clamp, thereby reducing the number of clamps and significantly reducing costs.

[0030] Further improvement, the first pressure plate is provided with a bolt through hole extending along the axial direction of the first pressure plate, the end cover is provided with an end cover through hole corresponding to the bolt through hole, the second pressure plate is provided with a pressure plate threaded hole corresponding to the bolt through hole and an end cover threaded hole corresponding to the end cover through hole, when the lip seal ring is installed properly, the first fixing bolt passes through the bolt through hole and is threadedly connected to the pressure plate threaded hole to fix the first pressure plate and the second pressure plate, the second fixing bolt passes through the end cover through hole and is threadedly connected to the end cover threaded hole to fix the second pressure plate and the end cover; when the lip seal ring is installed in reverse, the third fixing bolt passes through the end cover through hole, the bolt through hole and the pressure plate threaded hole to be threadedly connected to fix the end cover, the first pressure plate and the second pressure plate.

[0031] The beneficial effect is that with this design, the end cover, the first pressure plate and the second pressure plate are detachably fixedly connected by bolts, which is beneficial to ensuring the connection strength.

[0032] Further improvement, the second pressure plate is provided with a bolt through hole extending along the axial direction of the second pressure plate, the end cover is provided with an end cover through hole corresponding to the bolt through hole, the first pressure plate is provided with a pressure plate threaded hole corresponding to the bolt through hole and an end cover threaded hole corresponding to the end cover through hole, when the lip seal ring is installed upright, the third fixing bolt passes through the end cover through hole, the bolt through hole and the pressure plate threaded hole are threadedly connected to fix the end cover, the second pressure plate and the first pressure plate; when the lip seal ring is installed in reverse, the first fixing bolt passes through the bolt through hole and is threadedly connected to the pressure plate threaded hole to fix the second pressure plate and the first pressure plate, and the second fixing bolt passes through the end cover through hole and is threadedly connected to the end cover threaded hole to fix the first pressure plate and the end cover.

[0033] The beneficial effect is that with this design, the end cover, the first pressure plate and the second pressure plate are detachably fixedly connected by bolts, which is beneficial to ensuring the connection strength.

[0034] As a further improvement, an oil filling hole for injecting lubricant into the grease cavity is provided on the top surface of the end cover.

[0035] The beneficial effects are: the size of the oil injection hole is small, which reduces the contact area between the grease cavity and the external environment, and reduces the possibility of the lubricant in the grease cavity flowing into the outside through the oil injection hole.

[0036] As a further improvement, an annular protrusion for fitting with the lip seal ring is provided on the end face of the first pressure plate, and the annular groove is provided on the second pressure plate so that the protruding opening of the seal ring installation cavity faces away from the first pressure plate.

[0037] The beneficial effect is that: with this design, the sealing ring installation cavity is closer to the actual installation condition of the lip sealing ring.

[0038] As a further improvement, an O-ring is installed on the end surface of one end of the end cover that contacts the first pressure plate or the second pressure plate.

[0039] The beneficial effect is that such a design can prevent the grease in the grease cavity from leaking into the external environment along the radial direction of the end cover, thereby avoiding environmental pollution.

[0040] As a further improvement, the shield machine lip seal ring reduction test fixture also includes a threaded plug, and the oil filling hole is a threaded hole that cooperates with the thread of the threaded plug.

[0041] The beneficial effect is that: with this design, the sealing performance of the thread plug and the oil filling port is strong, which is conducive to ensuring the sealing performance of the shield machine lip seal ring reduction test fixture.

[0042] As a further improvement, at least one of the first pressure plate and the second pressure plate is provided with a groove on the outer periphery for fixing a scaled-down test fixture of the shield machine lip seal ring.

[0043] The beneficial effect is that: with such a design, the top screw is pushed into the card slot to realize the disassembly and assembly of the shield machine lip seal ring reduction test fixture, the structure is simple, and it is easy to realize. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of the scaled-down test device of the present invention when the lip seal ring is installed on the test bench;

[0045] Figure 2 for Figure 1 The structural diagram of the scaled-down test device in the embodiment of FIG. 1 is in the state where the lip seal ring is installed properly;

[0046] Figure 3 for Figure 2 A partial enlarged view of the

[0047] Figure 4 for Figure 2 Exploded view of the shield machine lip seal scale test fixture in the figure;

[0048] Figure 5 for Figure 4 A side view of the first pressure plate in FIG.

[0049] Figure 6 for Figure 1 The structural schematic diagram of the scaled-down test device in the embodiment of FIG. 1 is in the state where the lip seal ring is reversely installed;

[0050] In the figure: 11, test shaft; 12, first pressure plate; 13, second pressure plate; 14, end cover; 15, sealing ring; 16, oil filling hole; 17, connecting plate; 18, lip sealing ring; 19, groove; 20, annular groove; 21, bolt through hole; 22, end cover threaded hole; 23, pressure plate threaded hole; 24, end cover through hole; 25, grease chamber; 26, annular protrusion; 27, lip; 28, oil guide groove; 29, fixing seat; 30, driving motor. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0053] It should be noted that relational terms such as "first" and "second" that may appear are only used 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, terms such as "include", "comprise" or any other variants thereof that may appear are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, elements defined by the sentence "including a...", etc., do not exclude processes and methods that include the elements.

[0054] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] The present invention is further described in detail below in conjunction with embodiments.

[0057] Embodiment 1 of the scaled-down test device of the present invention:

[0058] This scaled-down test device is a bench test device that simulates the actual shield working conditions, that is, while ensuring that the stress-strain state of the lip seal is consistent with the actual size, the size of the lip seal is reduced to an appropriate range, and then the required parameters are obtained through bench testing. In order to make the test results meaningful, the finite element simulation analysis software Abaqus is used to design the sealing structure and size, the axial and radial compression of the lip seal is given, and the pressurized working conditions are determined, and finally a scaled-down part with the same stress-strain state as the seal in the original actual working conditions is obtained. The lip seal in this embodiment is a scaled-down part obtained by this calculation.

[0059] The purpose of conducting the test through the test device is to obtain the wear rate of the lip seal ring 18. The wear rate is obtained by the difference in inner diameters before and after the test, so it is necessary to measure the inner diameter of the lip seal ring 18 before and after the test through a profile scanner; secondly, in order to compare the contact stress obtained from the test with the simulation results of the finite element software, it is necessary to obtain the full-circumference radial force parameter value of the lip seal ring 18 before and after the test, so it is necessary to obtain the full-circumference radial force of the scaled-down part before and after the test through a radial force tester; finally, in order to verify the rationality of the finite element simulation fluid-solid coupling program, the torque parameter is selected as the reasonable criterion for the calculated value, so the torque parameter value needs to be obtained during the rotation test.

[0060] In this embodiment, Figure 1 As shown, the scaled test device includes a test shaft 11 and a shield machine lip seal ring scaled test fixture mounted on one end of the test shaft 11. The shield machine lip seal ring scaled test fixture is used to clamp the lip seal ring 18 so that the lip portion 27 of the lip seal ring 18 is sealed with the outer periphery of the test shaft 11 to ensure the axial compression and radial compression of the lip seal ring, so that the test result is more accurate. The shield machine lip seal ring scaled test fixture is installed and fixed on the fixed seat 29. A connecting plate 17 is provided at one end of the test shaft 11. The connecting plate 17 is provided with a plurality of connecting through holes arranged at intervals along the circumferential direction. Bolts pass through the connecting through holes to be fixedly connected with the output shaft of the driving motor 30. The driving motor 30 drives the test shaft 11 to rotate so as to generate relative rotation with the lip portion 27, thereby simulating the working environment in which the lip seal ring 18 is fixed on the fixed part and moves relative to the rotating part in the main drive sealing structure.

[0061] like Figures 2 to 4 As shown, the shield machine lip seal ring reduction test fixture includes an end cover 14, a first pressure plate 12 and a second pressure plate 13. The first pressure plate 12, the second pressure plate 13 and the end cover 14 are stacked together and detachably connected and fixed. A card slot is provided on the outer periphery of the first pressure plate 12, and a plurality of top screws extending in the radial direction are installed on the outer periphery of the fixing seat 29. The top screws are pushed into the card slot to fix the shield machine lip seal ring reduction test fixture on the fixing seat 29. The first pressure plate 12 is provided with two symmetrically distributed bolt through holes 21 along its circumference, and the bolt through holes 21 extend along the axial direction of the first pressure plate 12. The end cover 14 is provided with two symmetrically distributed end cover through holes 24 along its circumference and with the same distribution diameter as the bolt through holes 21. The second pressure plate 13 is provided with four evenly distributed threaded holes along its circumference, and every two relatively arranged threaded holes in the four threaded holes form a group. The two groups of threaded holes are respectively a pressure plate threaded hole 23 for connecting with the first pressure plate 12 and an end cover threaded hole 22 for connecting with the end cover 14.

[0062] like Figure 2 and Figure 3As shown, the end cover 14 covers the end of the test shaft 11 to enclose a grease chamber 25 for storing lubricants between the test shaft 11 and the second pressure plate 13 or the first pressure plate 12. The end cover 14 is a "J"-shaped structure, and an oil filling hole 16 is provided on the top surface of the end cover 14. The oil filling hole 16 is a threaded hole. After the lubricant is injected into the grease chamber 25 through the oil filling hole 16, the thread plug is fixed on the oil filling hole 16 to prevent the lubricant in the grease chamber 25 from overflowing. In this embodiment, the lubricant is lubricating oil. An annular groove 19 is provided on the end of the annular flange of the end cover 14 that is away from the top surface. A sealing ring 15 is installed in the groove 19. The sealing ring 15 is an O-ring to prevent the lubricant inside the shield machine lip seal ring reduction test fixture from leaking into the external environment. In other embodiments, the oil filling hole 16 can be a smooth hole.

[0063] like Figures 2 to 5 As shown, the first pressure plate 12 and the second pressure plate 13 are annular plates mounted on the outer circumference of the test shaft 11. The first pressure plate 12 is provided with an annular protrusion 26 that fits with the lip seal 18, and the annular protrusion 26 supports the lip 27 of the lip seal 18. Correspondingly, the second pressure plate 13 is provided with an annular groove 20 that fits with the lip seal 18, and the notch of the annular groove 20 faces the stacking direction of the first pressure plate 12 and the second pressure plate 13. After the first pressure plate 12 and the second pressure plate 13 are fixed, the annular protrusion 26 and the annular groove 20 form a sealing ring installation cavity that clamps the lip seal 18, so that the two pressure plates can limit the axial position and radial displacement of the lip seal 18 while ensuring the compression between the lip seal 18 and the test shaft 11. The sealing ring installation cavity has an extension port connected to the first pressure plate 12 and the second pressure plate 13, the extension port faces away from the first pressure plate 12, and the lip 27 of the lip seal ring 18 extends out of the extension port and seals with the outer peripheral surface of the test shaft 11 to simulate the actual working condition of the lip seal ring of the shield machine. The inner diameter of the second pressure plate 13 is larger than the inner diameter of the first pressure plate 12 to avoid the lip 27 of the lip seal ring 18.

[0064] When the first pressure plate 12 and the second pressure plate 13 are connected to the end cover 14 in different arrangement sequences, the lip seal ring 18 has two states: normal installation and reverse installation. Figure 2As shown, the lip 27 of the lip seal 18 is arranged toward the grease chamber 25, the first pressure plate 12 is provided with a connecting plate 17 with one end of the annular protrusion 26 facing away from the test shaft 11, the end cover 14, the second pressure plate 13 and the first pressure plate 12 are arranged in sequence along the axial direction of the test shaft 11, the first fixing bolt passes through the bolt through hole 21 of the first pressure plate 12 and is threadedly connected with the pressure plate threaded hole 23 of the second pressure plate 13 to fix the first pressure plate 12 and the second pressure plate 13 together, the second fixing bolt passes through the end cover through hole 24 of the end cover 14 and is threadedly connected with the end cover threaded hole 22 of the second pressure plate 13 to fix the second pressure plate 13 and the end cover 14 together, and a grease chamber 25 is formed between the end cover 14, the second pressure plate 13 and the test shaft 11. At this time, the shield machine lip seal scale test fixture is in the lip seal normal installation state. The lip seal reverse installation state is shown in FIG. Figure 6 As shown, the lip 27 of the lip seal 18 faces away from the grease chamber 25, and one end of the annular protrusion 26 provided on the first pressure plate 12 is arranged toward the connecting plate 17 of the test shaft 11, and the end cover 14, the first pressure plate 12 and the second pressure plate 13 are arranged in sequence along the axial direction of the test shaft 11, and the third fixing bolt passes through the end cover through hole 24, the bolt through hole 21 and the pressure plate threaded hole 23 to be threadedly connected to connect the end cover 14, the first pressure plate 12 and the second pressure plate 13 together, and a grease chamber 25 is formed between the end cover 14, the first pressure plate 12 and the test shaft 11. At this time, the shield machine lip seal scale test fixture is in the lip seal reverse installation state.

[0065] like Figure 4 As shown, an oil guide groove 28 extending along the radial direction of the first pressure plate 12 is formed on the end surface of the first pressure plate 12 facing away from the annular protrusion 26 . The oil guide groove 28 is used to guide and collect lubricant leaking from the grease chamber 25 .

[0066] When the scaled test device is used to test the sealing performance of the lip seal in the upright state, the test shaft 11 is first fixed on the drive motor 30, and the first pressure plate 12 is mounted on the outer periphery of the test shaft 11 and fixed with the side facing away from the annular protrusion 26 and facing the connecting plate 17 of the test shaft 11, so that the axis of the inner hole of the first pressure plate 12 coincides with the axis of the test shaft 11, and then the lip seal 18 is assembled in the first pressure plate 12 so that the lip seal 18 and the annular protrusion 26 fit together. Then, the second pressure plate 13 is mounted on the outer periphery of the test shaft 11 with the side provided with the annular groove 20 facing the connecting plate 17, so that the inner hole axis of the second pressure plate 13 coincides with the axis of the test shaft 11, and the lip seal ring 18 is installed in the annular groove 20 of the second pressure plate 13, and the lip portion 27 of the lip seal ring 18 extends from the extension port to seal with the outer peripheral surface of the test shaft 11, and the first fixing bolt passes through the bolt through hole 21 and is threadedly connected with the pressure plate threaded hole 23 of the second pressure plate 13. The end cover 14 is covered on the end of the test shaft 11, and the second fixing bolt passes through the end cover through hole 24 of the end cover 14 and is threadedly connected with the end cover threaded hole 22 of the second pressure plate 13, and lubricant is injected into the grease cavity 25 through the oil filling hole 16 of the end cover 14. After the lubricant fills the grease cavity 25, the screw plug is installed in the oil filling hole 16. Finally, the fixing seat 29 is aligned with the assembled scaled test device and the top screw is pushed into the slot, and the driving motor 30 is started. After rotating for a certain period of time, the test parameters of the lip seal ring when it is properly installed are obtained.

[0067] When the scaled-down test device is used to test the sealing performance of the lip seal 18 in the reversed state, the test steps are the same as those for testing the lip seal 18 in the normal state. The only difference is the connection sequence of the end cover 14, the first pressure plate 12 and the second pressure plate 13. At this time, the second pressure plate 13 is first mounted on the outer periphery of the test shaft 11 and fixed with the side facing away from the annular groove 20 toward the connecting plate 17, the lip seal 18 is assembled in the annular groove 20 so that the lip seal 18 fits with the annular groove 20, and then the first pressure plate 12 is mounted on the test shaft 11 with the end with the annular protrusion 26 facing the connecting plate 17 so that the lip seal 18 fits with the annular protrusion 26, and then the first pressure plate 12 is fixed on the fixing seat 29. Finally, the end cover 14 is covered on the end of the test shaft 11 , and the third fixing bolt is passed through the end cover through hole 24 of the end cover 14 , the bolt through hole 21 of the first pressure plate 12 and the pressure plate threaded hole 23 of the second pressure plate 13 for threaded connection.

[0068] It should be noted that the scaled test device is applicable to both grease and oil. When simulating the actual working condition of the lip seal 18 using grease, first fill the end cover 14 with grease, and then cover the end cover 14 on the test shaft 11. When simulating the actual working condition of the lip seal using lubricating oil, first cover the end cover 14 on the test shaft 11, and then inject lubricating oil into the grease cavity 25 through the oil filling port on the end cover 14. This solves the problem that when testing the sealing performance of the sealing ring through the shield machine, the sealing performance of the lip seal can only be tested under one lubricant working condition.

[0069] In the scaled-down test device of the present invention, the lip seal is a scaled-down part of the lip seal in the actual working condition after being proportionally reduced, and the size is relatively small, and the size of the required fixture is relatively small. The scaled-down test fixture of the lip seal of the shield machine is mounted on the outer periphery of the test shaft, and the first pressure plate of the scaled-down test fixture of the lip seal of the shield machine is provided with an annular protrusion, and the second pressure plate is provided with an annular groove. The first pressure plate and the second pressure plate are detachably fixedly connected so that the sealing ring installation cavity surrounded by the annular protrusion and the annular groove clamps the lip seal, and the lip of the lip seal is sealed with the outer peripheral surface of the test shaft, and the lip seal rotates relative to the test shaft, and lubricating oil is injected into the fixture through the oil filling hole on the end cover to simulate the actual working condition of the lip seal, and then the sealing performance test is carried out. The entire scaled-down test device has a simple structure, a simple connection method, is easy to clean and load and unload, has low operating difficulty, is easy to process, and has low cost. Moreover, the assembly positions of the first pressure plate and the second pressure plate can be exchanged, so that the forward installation and reverse installation of the lip seal ring can be completed without changing the fixture, which greatly reduces the cost.

[0070] Embodiment 2 of the scaled-down test device of the present invention:

[0071] The difference between this embodiment and embodiment 1 is that in embodiment 1, by exchanging the assembly positions of the first pressure plate 12 and the second pressure plate 13, a set of clamps can realize the two assembly states of the lip seal ring 18, namely, the normal installation and the reverse installation. In this embodiment, the sealing ring installation cavity surrounded by the first pressure plate and the second pressure plate can only clamp the lip seal ring in the normal installation or reverse installation state. At this time, two sets of clamps are required to complete the clamping of the lip seal ring in the normal installation and the reverse installation.

[0072] Embodiment 3 of the scaled-down test device of the present invention:

[0073] The difference between this embodiment and embodiment 1 is that: in embodiment 1, the first pressure plate 12 is provided with a bolt through hole 21 extending along the axial direction of the first pressure plate 12, the end cover 14 is provided with an end cover through hole 24 corresponding to the bolt through hole 21, and the second pressure plate 13 is provided with an end cover threaded hole 22. When the lip seal ring is installed upright, the first fixing bolt passes through the bolt through hole 21 and is threadedly connected with the pressure plate threaded hole 23 to fix the first pressure plate 12 and the second pressure plate 13, the second fixing bolt passes through the end cover through hole 24 and is threadedly connected with the end cover threaded hole 22 to fix the second pressure plate 13 and the end cover 14. When the lip seal ring is installed reversely, the third fixing bolt passes through the end cover through hole 24, the bolt through hole 21 and the pressure plate threaded hole 23 to fix the end cover 14, the first pressure plate 12 and the second pressure plate 13. In this embodiment, the second pressure plate is provided with a bolt through hole extending along the axial direction of the second pressure plate, the end cover is provided with an end cover through hole corresponding to the bolt through hole, the first pressure plate is provided with a pressure plate threaded hole corresponding to the bolt through hole and an end cover threaded hole corresponding to the end cover through hole, when the lip seal ring is installed in the normal state, the third fixing bolt passes through the end cover through hole, the bolt through hole and the pressure plate threaded hole are threadedly connected to fix the end cover, the second pressure plate and the first pressure plate; when the lip seal ring is installed in the reverse state, the first fixing bolt passes through the bolt through hole and is threadedly connected to the pressure plate threaded hole to fix the second pressure plate and the first pressure plate, and the second fixing bolt passes through the end cover through hole and is threadedly connected to the end cover threaded hole to fix the first pressure plate and the end cover. In other embodiments, the annular flange of the end cover is provided with a plurality of end cover through holes distributed along the circumference thereof, and the first pressure plate and the second pressure plate are both provided with threaded holes corresponding to the end cover through holes, and whether the shield machine lip seal ring reduction test fixture is in the normal state or the reverse state, the end cover, the first pressure plate and the second pressure plate are fixed by a set of fixing bolts.

[0074] Embodiment 4 of the scaled-down test device of the present invention:

[0075] The difference between this embodiment and embodiment 1 is that in embodiment 1, the end cover 14 is an "X"-shaped structure, and an oil filling hole 16 is provided on the top surface of the end cover 14. In this embodiment, the end cover is a split structure, and the end cover includes a main body of an annular structure and a cover threadedly matched with the main body. After the main body is fixed to the outer periphery of the test shaft, the cover is threadedly connected to the end cover to ensure the closed state of the scaled test device. In other embodiments, the oil filling port is eliminated on the end cover. In this case, the scaled test device only tests the lip seal ring with grease as a lubricant. It is also possible to provide an oil filling port extending radially on the first pressure plate or the second pressure plate, and inject lubricating oil into the grease cavity through the oil filling port.

[0076] Embodiment 5 of the scaled-down test device of the present invention:

[0077] The difference between this embodiment and embodiment 1 is that in embodiment 1, an annular protrusion 26 is provided on the end surface of the first pressure plate 12, and an annular groove 20 is provided on the second pressure plate 13. After the first pressure plate 12 and the second pressure plate 13 are fixed, the annular protrusion 26 and the annular groove 20 enclose the sealing ring installation cavity. In this embodiment, a first annular groove that fits with the lip-shaped sealing ring is provided on the first pressure plate, and the groove wall on the radial inner side of the first annular groove supports the lip of the lip-shaped sealing ring. The second pressure plate is provided with a second annular groove that fits with the lip-shaped sealing ring, so that the first pressure plate and the second pressure plate enclose the sealing ring installation cavity.

[0078] Embodiment 6 of the scaled-down test device of the present invention:

[0079] The difference between this embodiment and embodiment 1 is that in embodiment 1, the first pressure plate 12, the second pressure plate 13 and the end cover 14 are detachably fixedly connected by bolts. In this embodiment, the first pressure plate, the second pressure plate and the end cover are clamped by a plurality of clamping blocks spaced apart along the circumference of the first pressure plate, and the clamping blocks are clamped by a cylinder.

[0080] Embodiment 7 of the scaled-down test device of the present invention:

[0081] The difference between this embodiment and embodiment 1 is that in embodiment 1, a plurality of top screws extending in the radial direction are installed on the outer peripheral surface of the fixed seat 29, and the top screws are inserted into the slots of the first pressure plate 12 to achieve the fixed connection between the fixed seat 29 and the shield machine lip seal ring reduction test fixture. In this embodiment, a plurality of connecting bolts extending along the axial direction of the test shaft are installed on the fixed seat and the shield machine lip seal ring reduction test fixture, and the plurality of connecting bolts are distributed at intervals along the circumference of the test shaft to achieve the fixed connection between the fixed seat and the shield machine lip seal ring reduction test fixture. At this time, a set of corresponding connecting perforations need to be added to the end cover, the first pressure plate and the second pressure plate. In other embodiments, under the premise of ensuring the connection strength between the fixed seat and the shield machine lip seal ring reduction test fixture, the connecting bolts only connect the fixed seat and the lower part of the shield machine lip seal ring reduction test fixture.

[0082] An embodiment of a shield machine lip seal ring reduction test fixture of the present invention: The structure of the shield machine lip seal ring reduction test fixture is the same as the structure of the shield machine lip seal ring reduction test fixture described in any one of Embodiments 1 to 7 of the above-mentioned reduction test device, and will not be described in detail here.

[0083] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. Shield machine lip seal ring scale test fixture, characterized in that: The invention comprises a first pressure plate and a second pressure plate which is stacked with the first pressure plate and is detachably fixedly connected. At least one of the first pressure plate and the second pressure plate is provided with an annular groove. The notch of the annular groove faces the stacking direction of the first pressure plate and the second pressure plate, so as to form a sealing ring installation cavity for clamping the lip sealing ring after the first pressure plate and the second pressure plate are fixed. The sealing ring installation cavity has an extension opening for the lip of the lip sealing ring to extend out of the sealing ring installation cavity. The first pressure plate and the second pressure plate are both used to be sleeved on the outer periphery of the test shaft so that the lip of the lip sealing ring is aligned with the test shaft. An annular disk that seals the outer circumferential surface of the rotating shaft; the shield machine lip seal ring scaled test fixture also includes an end cover, which is used to be fixedly connected to the first pressure plate or the second pressure plate to form a grease chamber with the test rotating shaft, and the grease chamber is used to store lubricant for lubricating the lip seal ring. The shield machine lip seal ring scaled test fixture has a lip seal ring upright state and a lip seal ring reversed state. When the lip seal ring is upright, the second pressure plate is between the end cover and the first pressure plate, and when the lip seal ring is reversed, the first pressure plate is between the end cover and the second pressure plate.

2. The shield machine lip seal ring reduction test fixture according to claim 1 is characterized in that: The first pressure plate is provided with a bolt through hole extending along the axial direction of the first pressure plate, the end cover is provided with an end cover through hole corresponding to the bolt through hole, the second pressure plate is provided with a pressure plate threaded hole corresponding to the bolt through hole and an end cover threaded hole corresponding to the end cover through hole. When the lip seal ring is installed upright, the first fixing bolt passes through the bolt through hole and is threadedly connected to the pressure plate threaded hole to fix the first pressure plate and the second pressure plate, and the second fixing bolt passes through the end cover through hole and is threadedly connected to the end cover threaded hole to fix the second pressure plate and the end cover; when the lip seal ring is installed in reverse, the third fixing bolt passes through the end cover through hole, the bolt through hole and the pressure plate threaded hole to be threadedly connected to fix the end cover, the first pressure plate and the second pressure plate.

3. The shield machine lip seal ring reduction test fixture according to claim 1 is characterized in that: The second pressure plate is provided with a bolt through hole extending along the axial direction of the second pressure plate, the end cover is provided with an end cover through hole corresponding to the bolt through hole, the first pressure plate is provided with a pressure plate threaded hole corresponding to the bolt through hole and an end cover threaded hole corresponding to the end cover through hole, when the lip seal ring is installed upright, the third fixing bolt passes through the end cover through hole, the bolt through hole and the pressure plate threaded hole are threadedly connected to fix the end cover, the second pressure plate and the first pressure plate; when the lip seal ring is installed reversely, the first fixing bolt passes through the bolt through hole and is threadedly connected to the pressure plate threaded hole to fix the second pressure plate and the first pressure plate, and the second fixing bolt passes through the end cover through hole and is threadedly connected to the end cover threaded hole to fix the first pressure plate and the end cover.

4. The shield machine lip seal ring reduction test fixture according to any one of claims 1 to 3, characterized in that: An oil injection hole for injecting lubricant into the grease cavity is arranged on the top surface of the end cover.

5. The shield machine lip seal scale test fixture according to any one of claims 1 to 3, characterized in that: An annular protrusion for fitting with the lip seal ring is provided on the end surface of the first pressure plate, and the annular groove is arranged on the second pressure plate so that the protruding opening of the seal ring installation cavity faces away from the first pressure plate.

6. The shield machine lip seal scale test fixture according to any one of claims 1 to 3, characterized in that: A sealing ring is installed on the end surface of one end of the end cover that is in contact with the first pressure plate or the second pressure plate.

7. The shield machine lip seal ring reduction test fixture according to claim 4 is characterized in that: The shield machine lip seal ring reduction test fixture also includes a threaded plug, and the oil filling hole is a threaded hole that matches the thread of the threaded plug.

8. The shield machine lip seal scale test fixture according to any one of claims 1 to 3, characterized in that: A slot for fixing a scaled-down test fixture of a lip seal ring of a shield machine is provided on the outer periphery of at least one of the first pressure plate and the second pressure plate.

9. A scaled-down test device, characterized in that: The invention comprises a test shaft and a shield machine lip seal ring reduction test fixture mounted on the test shaft. The shield machine lip seal ring reduction test fixture is the shield machine lip seal ring reduction test fixture described in any one of claims 1 to 8.

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