Sealing test clamp for air inlet pipe and test method

Abstract

The invention discloses a sealing test clamp for an air inlet pipe and a test method, and belongs to the field of diesel engine air inlet pipe sealing, the test clamp comprises an axial and radial integrated sealing device installed on the end face of a phi 100 pipe orifice of the air inlet pipe and simulation nozzle integrated sealing devices installed on the end faces of eight forming holes; according to the axial-radial integrated sealing device, a first radial movable handle and a second axial movable handle are rotated to drive a clamping ring and a lower supporting plate to achieve pressing sealing. According to the simulation nozzle integrated sealing device, sealing of the forming hole is achieved through stress extrusion deformation between the O-shaped sealing ring and the sealing hole. According to the invention, the rapid and effective sealing test of the air inlet pipe can be realized, the problems of low sealing test efficiency and high labor intensity of workers are solved, the sealing test efficiency of the air inlet pipe is more than twice, and the labor intensity of the workers is reduced by more than 2 / 3.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of diesel engine intake pipe sealing, in particular to a sealing test fixture for an intake pipe and a test method. BACKGROUND

[0002] The present application relates to a kind of air-tightness detection device and method, specifically relates to a kind of sealing test fixture and test method for large-batch production of cast aluminum intake pipe.In the production and manufacture of intake pipe, sealing test is the core key process of quality control.The test usually requires the sealing of each pipe opening and hole of intake pipe, and the gas (for example 0.3MPa) is filled into the workpiece inside at a certain pressure, and the pressure is maintained for a period of time (for example 3 minutes), to test whether the workpiece exists leakage during the entire pressure maintaining process.The efficiency and reliability of sealing test are directly related to the quality of product, production cost and production rhythm.

[0003] At present, the sealing test is carried out on the complex cast aluminum intake pipe as shown in Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 The pipe opening (I) with an angle of 45° and a diameter of φ100, eight formed holes (II) and the installation bottom surface (III) need to be sealed and pressed tightly, and the sealing mode of combined split fixture and bolt pressing is usually adopted.Specifically:

[0004] (1) For the main channel with larger diameter, i.e.the pipe opening (I) with a diameter of φ100, the existing technology adopts the sealing form of "rubber tube + plug cover + double clamp".During operation, the rubber tube needs to be sleeved into the pipe opening (I), then the plug cover is covered, and finally two clamps are used for locking and fixing to realize sealing.

[0005] (2) For the eight formed holes (II) on the workpiece, since the hole diameter is relatively large (φ22.5mm), the existing technology adopts the one-by-one pressing sealing mode of "M12 bolt + flat gasket + rubber gasket + bottom bolt fixing seat".That is, the operator needs to use tools to screw eight bolts into the corresponding fixing seat respectively, and the rubber gasket is deformed by the clamping force of the bolt, so as to block the eight formed holes (II).

[0006] (3) The installation bottom surface (III) of the intake pipe is sealed by using a Q235 steel plate with a thickness of 12mm which is slightly larger than the size of the installation bottom surface, and the rubber gasket is pressed tightly by 8 M8x112mm bolts, 8 M8x45mm bolts and rubber gaskets.

[0007] However, the above-mentioned existing sealing test technology has the following significant defects:

[0008] (1) Sealing reliability is poor, which easily leads to test failure: for the pipe mouth (I), the pressing mode of the rubber tube and the clamp is difficult to provide uniform and reliable circumferential sealing force, which easily leads to leakage under 0.3 MPa pressure, thus failing to maintain pressure and invalidating the test results. For the eight φ22.5 mm formed holes (II), the sealing specific pressure generated by single bolt pressing is insufficient, and the rubber pad is difficult to completely adhere, so that the gas is easily leaked from the sealing part, which seriously affects the accuracy and reliability of the test.

[0009] (2) Low operation efficiency, which restricts the production rhythm: whether it is the installation and removal of the clamp of the pipe mouth (I) or the tightening and loosening of the eight M12 bolts one by one, all belong to tedious manual operation, which is time-consuming. This makes the sealing test time of single product too long, and the efficiency is low, which cannot meet the requirement of high efficiency for large-scale batch production.

[0010] (3) High labor intensity of workers and poor ergonomics: repeated clamp locking and tightening of multiple bolts require workers to exert great physical strength, which is extremely high in labor intensity. Long-term operation easily leads to worker fatigue and may cause muscle and bone injury, and also further reduces the work efficiency due to inconvenient operation.

[0011] In summary, the existing sealing test method has become a bottleneck restricting the production efficiency and product quality improvement of the intake pipe. Therefore, a new sealing test fixture and method are urgently needed to greatly improve the test efficiency and reduce the labor intensity of workers under the premise of ensuring sealing reliability. SUMMARY

[0012] The technical problem to be solved by the present application is to provide a sealing test fixture and test method for an intake pipe, to realize rapid and effective sealing test of the intake pipe, to solve the problems of low sealing test efficiency and high labor intensity of workers, to make the sealing test efficiency for the intake pipe more than 2 times, and to reduce the labor intensity of workers by more than 2 / 3.

[0013] To solve the above technical problems, the technical solution adopted by the present application is:

[0014] A sealing test fixture for an intake pipe, comprising an axial-radial integrated sealing device installed on the end face of a φ100 pipe mouth of the intake pipe and a simulated nozzle integrated sealing device installed on the end face of eight formed holes; the axial-radial integrated sealing device realizes pressing and sealing by driving the clamping ring and the lower support plate through rotating the radial first movable handle and the axial second movable handle respectively; the simulated nozzle integrated sealing device realizes the sealing of the formed holes through the stress-induced deformation between the O-shaped sealing ring and the sealing hole.

[0015] Further improvement of the technical solution of the present application is that the axial-radial integrated sealing device comprises a radial clamping device and an axial pressing device.

[0016] The radial clamping device comprises a support frame sleeved outside the pipe opening, a clamping ring installed inside the support frame, and a first movable handle provided outside the support frame; the support frame is connected and fixed with the axial compression device through support bolts; the outer side of the clamping ring is fixed with a pressing block, which is connected with a first M10 nut welded on the support frame through a first compression screw, so as to realize reliable transmission of clamping force and have a anti-loosening function; the first movable handle is installed at the end of the first compression screw, and is used for providing required torque during operation;

[0017] The axial compression device comprises an upper support plate, a lower support plate and a second compression screw; the upper support plate is fixedly connected with the radial clamping device through support bolts at both ends, and a second M10 nut is welded above the upper support plate, which is used for screwing into the second compression screw; the lower support plate is arranged at the upper end of the pipe opening, and a lower rubber pad is arranged between the upper support plate and the lower support plate; the lower support plate is in clearance fit with the support bolts to provide guidance, and is connected with the upper support plate through the second compression screw; the top end of the second compression screw is provided with a second movable handle for providing operation torque; the lower support plate is also provided with an airtight joint for connecting compressed air.

[0018] Further improvement of the technical scheme of the present application is that the support frame is composed of a square frame and a circular arc frame, which are arranged on both sides of the support frame; an ear plate with a connecting hole is arranged at the connection position of the square frame and the circular arc frame, and the connecting hole is used for penetrating the support bolt; a first threaded hole is formed in the square frame, and a first M10 nut is welded outside the square frame.

[0019] Further improvement of the technical scheme of the present application is that one side of the pressing block in contact with the clamping ring is an arc surface; a counterbore is formed in the pressing block, and a second threaded hole is arranged at the outer end of the counterbore; a chamfer is arranged on the side of the pressing block opposite to the arc surface.

[0020] Further improvement of the technical scheme of the present application is that the upper support plate is symmetrical in whole and has a waist shape, and the edges are transitioned by circular arcs; threaded holes are arranged at both ends of the upper support plate for penetrating the support bolts; a third threaded hole is arranged in the middle of the upper support plate for penetrating the second compression screw.

[0021] The lower support plate is symmetrical in whole and has a flat profile, the upper and lower edges are large circular arcs, the left and right sides are connected by inclined straight edges, and the two end hole positions are transitioned by small circular arcs; through holes are arranged at both ends of the lower support plate for penetrating the support bolts, a boss is arranged at the middle position, a fourth threaded hole is arranged in the boss for screwing in the second compression screw, and a mounting hole is arranged on one side of the boss for mounting the airtight joint.

[0022] A further improvement of the technical solution of the present invention is that: both sides of the first movable handle and the second movable handle are provided with retaining rings to prevent them from falling off.

[0023] A further improvement of the technical solution of the present invention is that the angular envelope range of the clamping ring is 96°.

[0024] A further improvement of the technical solution of the present invention is as follows: the integrated sealing device for the simulated nozzle includes a positioning rod, eight sealing rods, four clamping blocks, and eight O-rings; the positioning rod is positioned above the eight forming holes, and the positioning rod has eight stepped positioning holes, the positions of which are consistent with the positions of the eight forming holes; the upper end of each sealing rod is installed in the stepped positioning hole by interference fit, the lower end of each sealing rod extends into the corresponding forming hole, and the lower end of each sealing rod has a slot, in which the O-ring is installed; the clamping block is fixedly disposed on the outside of the positioning rod and is used to connect with the fixing hole on the air intake pipe body by screws to clamp the positioning rod; a flat washer and a first M8 nut for locking are installed at the top of the sealing rod; the positioning rod has an L-shaped structure, and its lower end is provided with a bolt hole for fixing.

[0025] A further improvement of the technical solution of the present invention is that: the test fixture further includes a mounting bottom sealing fixture installed on the mounting bottom surface, the mounting bottom sealing fixture including a sealing bottom plate, the sealing bottom plate being installed on the lower end of the air inlet pipe mounting bottom surface by fastening bolts; a third rubber pad is pressed between the mounting bottom surface and the sealing bottom plate; the sealing bottom plate is provided with a plurality of fifth threaded holes aligned with the holes of the mounting bottom surface, and the third rubber pad is provided with through holes aligned with the holes of the mounting bottom surface.

[0026] An intake pipe sealing test method includes the following steps:

[0027] Step 1, Install the bottom seal: First, place the third rubber gasket on the sealing base plate, then cover the mounting bottom of the air intake pipe on the third rubber gasket, ensuring that the holes of the three are aligned; then, use the first and third bolts to pass through the corresponding holes and screw them into the fifth threaded hole of the sealing base plate, and use the tightening force of the bolts to press the third rubber gasket between the mounting bottom and the sealing base plate, thereby achieving a seal;

[0028] Step 2, Forming Hole Sealing: Press the eight sealing rods with O-rings installed in the integrated sealing device of the simulated nozzle into the eight forming holes of the air intake pipe respectively, press the positioning rod on the upper end, install the flat washer and the first M8 nut on the sealing rod respectively and tighten them. Then use the second bolt to fix the clamping block to the corresponding threaded hole on the air intake pipe body to achieve sealing of the forming hole.

[0029] Step 3, pipe mouth sealing:

[0030] 3.1 Assemble the radial clamping device and the axial pressing device in the shaft radial integrated sealing device, and install the air-tight joint on the axial pressing device;

[0031] 3.2 Pre-adjust the radial size: rotate the first movable handle 4-5 circles counterclockwise in the radial clamping device, so that the diameter of the clamping circle composed of the clamping ring and the support frame increases to φ104-φ105mm, so as to be put into the pipe mouth;

[0032] 3.3 Pre-adjust the axial space: rotate the second movable handle 4-5 circles counterclockwise in the axial pressing device, so that the space distance between the lower end surface of the rubber pad and the upper end surface of the support frame increases to 13-14mm, reserving the pressing stroke;

[0033] 3.4 Installation and locking: put the adjusted clamping circle part into the pipe mouth, so that the lower rubber pad is in contact with the pipe mouth end surface; then rotate the first movable handle clockwise, to drive the clamping ring to clamp the pipe wall radially; then rotate the second movable handle clockwise, to drive the lower support plate and the lower rubber pad to press the pipe mouth end surface axially;

[0034] Step 4, pressure test and disassembly: pressure medium is introduced into the sealed inlet pipe to test the sealing performance; after the test is completed, the shaft radial integrated sealing device, the simulated nozzle integrated sealing device and the installation bottom surface sealing clamp are operated in reverse order, and the inlet pipe is disassembled.

[0035] Due to the adoption of the above technical scheme, the technical progress achieved by the present application is:

[0036] 1. By adopting the shaft radial integrated sealing device and the simulated nozzle integrated sealing device, the present application realizes the rapid and synchronous sealing of the main interfaces of the complex inlet pipe. The sealing test efficiency is improved by more than 2 times by using the clamp provided by the present application, greatly shortening the test time of single product.

[0037] 2. The clamp provided by the present application is designed ingeniously, and the radial clamping and axial pressing can be easily completed by rotating the movable handle, which is simple and labor-saving. At the same time, the integrated positioning rod is adopted in the simulated nozzle device, and the sealing positioning of multiple forming holes is completed at one time. Finally, the labor intensity of workers is reduced by more than two-thirds.

[0038] 3. The core shaft radial sealing device of the clamp provided by the present application adopts modular design, which can adapt to multiple different specifications of inlet pipes by replacing clamping rings and support frames of different sizes. This makes a set of clamp capable of meeting the sealing test requirements of multiple similar cast aluminum parts, reducing the manufacturing cost and management complexity of the tooling.

[0039] 4. The clamp provided by this invention adopts a multi-stage sealing design (such as O-rings and rubber gaskets) and has an anti-loosening structure (such as welded nuts and pressure blocks to transmit clamping force), which ensures the sealing reliability during the pressure test; the movable handle is equipped with retaining rings on both sides to prevent the risk of the handle falling off during operation and improve the safety of use.

[0040] 5. The key components of the clamp provided by this invention, such as the support frame, pressure block, and support plate, are all carefully designed (e.g., split support frame, pressure block with arc surface, waist-shaped upper support plate, etc.), so that the force is more reasonable and the clamping is more uniform; in particular, the 96° angular envelope range of the clamping ring ensures sufficient clamping force while avoiding excessive coverage and interference of the pipe opening, thus achieving efficient and reliable sealing. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a three-dimensional structural diagram of the intake pipe in this invention;

[0043] Figure 2 Top view of the air intake pipe in this invention;

[0044] Figure 3 In this invention Figure 2 AA cross-sectional view;

[0045] Figure 4 This is a schematic diagram of the intake pipe sealing position in this invention;

[0046] Figure 5 This is a schematic diagram of the overall structure of an intake pipe sealing test fixture provided in this embodiment of the invention. Figure 1 ;

[0047] Figure 6 This is a three-dimensional assembly drawing of the axial and radial integrated sealing test fixture for the φ100 inlet of the air inlet and the integrated sealing test fixture for the shaped hole simulated nozzle in this embodiment of the invention.

[0048] Figure 7 This is a three-dimensional exploded view of the integrated axial and radial sealing test fixture for the φ100 inlet of the air intake pipe and the integrated nozzle with the shaped hole, as described in this embodiment of the invention.

[0049] Figure 8 This is a three-dimensional assembly drawing of the axial and radial integrated sealing device for the φ100 inlet of the air intake pipe in this embodiment of the invention;

[0050] Figure 9 is a three-dimensional exploded view of the shaft and radial integrated sealing device for the mouth of the air inlet pipe φ100 in the embodiment of the present application;

[0051] Figure 10 is a structural schematic diagram of the radial clamping device in the embodiment of the present application;

[0052] Figure 11 is a structural schematic diagram of the support frame in the embodiment of the present application;

[0053] Figure 12 is a structural schematic diagram of the pressing block in the embodiment of the present application;

[0054] Figure 13 is a structural schematic diagram of the axial pressing device in the embodiment of the present application;

[0055] Figure 14 is a top view of the upper support plate in the embodiment of the present application;

[0056] Figure 15 is a front view of the lower support plate in the embodiment of the present application;

[0057] Figure 16 is a top view of the lower support plate in the embodiment of the present application;

[0058] Figure 17 is a structural schematic diagram of the first pressing screw and the second pressing screw in the embodiment of the present application;

[0059] Figure 18 is a structural schematic diagram of the overall structure of the sealing test clamp for the air inlet pipe provided in the embodiment of the present application Figure 2 ;

[0060] Figure 19 is a three-dimensional assembly of the integrated sealing device for the simulation nozzle of the forming hole of the air inlet pipe in the embodiment of the present application;

[0061] Figure 20 is an assembly top view of the integrated sealing device for the simulation nozzle of the forming hole of the air inlet pipe in the embodiment of the present application;

[0062] Figure 21 is a three-dimensional exploded view of the integrated sealing device for the simulation nozzle of the forming hole of the air inlet pipe in the embodiment of the present application;

[0063] Figure 22 is a structural schematic diagram of the positioning rod in the embodiment of the present application;

[0064] Figure 23 is a structural schematic diagram of the sealing rod in the embodiment of the present application;

[0065] Figure 24 is a structural schematic diagram of the pressing block in the embodiment of the present application;

[0066] Figure 25 is a structural schematic diagram of the O-shaped sealing ring in the embodiment of the application;

[0067] Wherein, I, pipe orifice; II, forming hole; III, installation bottom surface; 1, first rubber pad; 2, gas seal joint; 3, first bolt; 4, second rubber pad; 5, sealing rod; 6, first M8 nut; 7, flat pad; 8, positioning rod; 9, pressing block; 10, second bolt; 11, O-shaped sealing ring; 12, third bolt; 13, third rubber pad; 14, sealing bottom plate; 15, first movable handle; 16, first pressing screw; 17, first M10 nut; 18, supporting frame; 18-1, square frame; 18-2, circular arc frame; 18-3, ear plate; 18-4, connecting hole; 18-5, first threaded hole; 19, pressing block; 19-1, arc surface; 19-2, second threaded hole; 19-3, counterbore; 19-4, chamfer; 20, clamping ring; 21, second M8 nut; 22, supporting bolt; 23, upper supporting plate; 24, check ring; 25, second movable handle; 26, second pressing screw; 27, second M10 nut; 28, lower supporting plate; 29, lower rubber pad. DETAILED DESCRIPTION

[0068] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification and in the claims and the above described drawings are intended to cover not exclusive inclusions, for example, a process, method, system, product, or apparatus that comprises a list of steps or units need not necessarily be limited to those steps or units explicitly listed, but can include other steps or units not expressly listed or inherent to such process, method, product, or apparatus.

[0069] In the description of the application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0070] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "several" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0071] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0072] like Figures 5-7 As shown, a sealing test fixture for an intake pipe includes an integrated axial and radial sealing device installed on the end face of the φ100 inlet I of the intake pipe and an integrated sealing device for simulated nozzles installed on the end faces of eight forming holes. The integrated axial and radial sealing device achieves a compression seal by rotating the first radial movable handle 15 and the second axial movable handle 25 respectively, thereby driving the clamping ring 20 and the lower support plate 28. The integrated sealing device for simulated nozzles achieves a seal of the forming holes II by the force-compression deformation between the O-ring 11 and the sealing hole.

[0073] Furthermore, such as Figure 8 , Figure 9 , Figure 10 , Figure 13 As shown, the axial-radial integrated sealing device includes a radial clamping device and an axial pressing device;

[0074] The radial clamping device includes a support frame 18 fitted on the outside of the pipe opening I, a clamping ring 20 installed inside the support frame 18, and a first movable handle 15 located on the outside of the support frame 18. The support frame 18 is connected and fixed to the axial clamping device via support bolts 22. A pressure block 19 is fixed to the outside of the clamping ring 20. The pressure block 19 is connected to a first M10 nut 17 welded to the support frame 18 via a first clamping screw 16, thereby achieving reliable transmission of clamping force and providing an anti-loosening function. The first movable handle 15 is installed at the end of the first clamping screw 16 and is used to provide the required torque during operation, such as... Figure 17 As shown; specifically, in order to increase the service life of the radial clamping device, the support frame 18, pressure block 19, clamping ring 20, and first clamping screw 16 are all made of 45# steel and are heat-treated to achieve a hardness of HRC30~35.

[0075] The axial clamping device includes an upper support plate 23, a lower support plate 28, and a second clamping screw 26. The upper support plate 23 is fixedly connected to the radial clamping device via support bolts 22 at both ends, and a second M10 nut 27 is welded to its top for screwing in the second clamping screw 26. The lower support plate 28 is located at the upper end of the pipe opening I, and a lower rubber pad 29 is provided between the two. The lower support plate 28 is clearance-fitted with the support bolts 22 to provide guidance, and is connected to the upper support plate 23 via the second clamping screw 26. The top of the second clamping screw 26 is equipped with a second movable handle 25 for providing operating torque, such as... Figure 17As shown; an airtight connector 2 for connecting compressed air is also installed on the lower support plate 28. When installing the airtight connector 2, the first rubber pad 1 needs to be installed. Specifically, in order to increase the service life of the axial clamping device, the upper support plate 23, the second clamping screw 26, and the lower support plate 28 are all made of 45# steel and are heat-treated to achieve a hardness of HRC30~35.

[0076] Furthermore, such as Figure 11 As shown, the support frame 18 consists of a square frame 18-1 and an arc frame 18-2, which are placed on both sides of the support. An ear plate 18-3 with a connecting hole 18-4 is provided at their connection point for the support bolt 22 to pass through. A first threaded hole 18-5 is opened on the square frame 18-1, and a first M10 nut 17 is welded to its outer side. Specifically, the arc frame 18-2 is designed to have the same outer diameter as the intake pipe diameter φ100 to ensure a snug fit during clamping; both the upper and lower sides of the arc center are machined. The connecting holes 18-4 are used, and the support bracket 18 is connected and fixed to the axial clamping device through the support bolt 22 and the second M8 nut 21. The processing of the support bracket 18 is as follows: First, the outer shape and inner cavity are processed to the required dimensions using a laser cutting machine with a thickness of 25mm 45# steel plate; then, two 25mm planes are ground using a surface grinder to ensure the installation accuracy in subsequent steps; finally, 2×2×25mm planes are machined using a vertical machining center. Holes and M10 threaded holes to the required dimensions.

[0077] Furthermore, such as Figure 12As shown, the side of the pressing block 19 in contact with the clamping ring 20 is an arc surface 19-1; the pressing block 19 has a counterbore 19-3 inside, and the outer end of the counterbore is provided with a second threaded hole 19-2; the side of the pressing block 19 opposite the arc surface 19-1 is provided with a chamfer 19-4. Specifically, the arc surface 19-1 is an R57 circular arc, one side of which is connected integrally with the clamping ring 20 by welding, and the other side is connected with the first pressing screw 16 through the second threaded hole 19-2 (M10 threaded hole) and the counterbore 19-3 (φ12), for transmitting clamping force; since the length of the M10 threaded part of the first pressing screw 16 is 5mm, and the depth of the φ12 counterbore 19-3 in the pressing block 19 is 6mm, when the M10x5mm threaded part of the first pressing screw 16 is completely screwed into the counterbore 19-3 (φ12x6mm), the threads between the two workpieces are in a completely unpinched state, and when the two workpieces are not simultaneously subjected to axial rotational force, the first pressing screw 16 will not loosen from the pressing block 19, so that the two workpieces can be freely rotated radially, and the two workpieces can be prevented from loosening during rotation of the first pressing screw 16. The first M10 nut 17 is aligned with the first threaded hole 18-5 (M10 threaded hole) on the left side of the support frame 18 through the central M10 threaded hole, and is welded, for transmitting clamping force, and can effectively prevent loosening of the first pressing screw 16 during clamping. The first movable handle 15 and the retaining ring 24 are used to increase the hand torque applied by the operator and prevent falling off.

[0078] Further, as shown in Figure 14 , the upper support plate 23 is overall symmetrical "waist-shaped", with a circular arc transition at the edge; both ends of the upper support plate 23 are provided with bolt holes for the support bolts 22 to pass through; the middle is provided with a third threaded hole for the second pressing screw 26 to pass through. Specifically, the left and right sides of the upper support plate 23 are machined with bolt holes, and are connected and fixed with the radial clamping device through the support bolts 22 and the second M8 nut 21; the central third threaded hole (M10) threaded hole is aligned with the M10 threaded hole of the second M10 nut 27, and is welded, for transmitting clamping force, and can effectively prevent loosening of the first pressing screw 16 during clamping; the upper support plate 23 is processed as follows: first, a 7mm thick 45# steel plate is processed by a laser cutting machine to the size requirement of the outer shape and inner cavity; then, two planes with a size of 6mm are ground by a surface grinder to ensure the installation accuracy of the subsequent sequence; finally, 2x holes and M10 threaded holes are machined to the size requirement by a vertical machining center.

[0079] As shown in Figure 15 , Figure 16As shown, the lower support plate 28 is overall symmetrical in a flat profile, the upper and lower edges are large circular arcs, the left and right sides are connected by inclined straight edges, and the two end hole regions are transitioned by small circular arcs; the left and right ends of the lower support plate 28 are provided with through holes for the supporting bolts 22 to pass through, and a boss is provided at the middle position, a fourth threaded hole is provided in the boss for the second compression screw 26 to be screwed into, and a mounting hole for mounting the gas seal joint 2 is provided on one side of the boss. Specifically, the left and right sides of the lower support plate 28 are machined holes, and through cooperation with the outer circle of the supporting bolt 22 , the holes are used for guiding during compression of the air inlet pipe; the φ18 outer circle upper end surface center M10 threaded hole and the φ12 counterbore are connected with the second compression screw 26, and are used for transmitting clamping force; the middle lower end is provided with an M10 threaded through hole connected with the gas seal joint 2, and is used for the entry of compressed air; the machining process of the lower support plate 28 is as follows: first, a 7mm thick 45# steel plate is processed by a laser cutting machine to process the shape and inner cavity to the required size; then, two planes with a size of 6mm are ground by a surface grinder to ensure the installation accuracy in the subsequent process; finally, a φ18×14 boss (step outer circle), 2× holes and M10 threaded holes are machined to the required size by a vertical machining center. The second movable handle 25 and the retaining ring 24 are used to increase the hand torque applied by the operator and prevent falling off.

[0080] As shown in Figure 8 , Figure 9 , Figure 13 , the left and right sides of the first movable handle 15 and the second movable handle 25 are provided with retaining rings 24 to prevent falling off.

[0081] Further, as shown in Figure 10 , the angular envelope range of the clamping ring 20 is 96°. The clamping ring 20 is mainly used in cooperation with the support frame 18 to clamp the outer diameter of the air inlet pipe with a diameter of φ100, and the inner diameter is designed to be the same size as the outer diameter of the air inlet pipe with a diameter of φ100, to ensure the fit during clamping; the angle is designed to be 96°, which not only ensures the clamping torque, and makes clamping convenient and fast, but also effectively avoids the interference problem during installation and clamping.

[0082] As shown in Figure 17 , one end of the structure of the first compression screw 16 and the second compression screw 26 is provided with a through hole for mounting a movable handle, and the other end is provided with an end for being screwed into a threaded hole.

[0083] The assembly process of the shaft and radial integrated sealing device is as follows:

[0084] (1) First, align the first M10 nut 17 with the M10 first threaded hole 18-5 on the left side of the support frame 18 through the center M10 threaded hole, and weld;

[0085] (2) First compression screw 16 is screwed into M10 first threaded hole 18-5, and compression block 19 is connected with first compression screw 16 through M10 second threaded hole 19-2;

[0086] (3) The connected compression block 19 is aligned with the middle position of clamping ring 20, and is welded;

[0087] (4) First movable handle 15 is connected with first compression screw 16, and stop ring 24 is installed at both ends of first movable handle 15;

[0088] (5) Second M10 nut 27 is aligned with M10 threaded hole in upper support plate 23 through center M10 threaded hole, and is welded;

[0089] (6) Two supporting bolts 22 are connected with supporting frame 18 through lower end M8 threaded hole, and are fixed with M8 nut at lower end.

[0090] (7) Lower support plate 28 and lower rubber pad 29 are installed on supporting bolt 22 through two side holes;

[0091] (8) Upper support plate 23 is connected with supporting bolt 22 through two side holes, and is fixed with M8 nut at upper end;

[0092] (9) Second compression screw 26 is screwed into threaded hole in upper support plate 23 and lower support plate 28 respectively;

[0093] (10) Second movable handle 25 is connected with second compression screw 26, and stop ring 24 is installed at both ends of second movable handle 25.

[0094] Further, as Figure 18 , Figure 19 , Figure 20 , Figure 21 , Figure 22 , Figure 23 , Figure 24 , Figure 25As shown, the simulated nozzle integrated sealing device includes a positioning rod 8, eight sealing rods 5, four clamping blocks 9, and eight O-rings 11. The positioning rod 8 is positioned above the eight forming holes II, and has eight stepped positioning holes, the positions of which correspond to the positions of the eight forming holes II. The upper end of each sealing rod 5 is installed in the stepped positioning hole by interference fit, and the lower end of each sealing rod 5 extends into the corresponding forming hole II. The lower end of each sealing rod 5 has a slot, and the O-ring 11 is installed in the slot. The clamping block 9 is fixedly positioned on the outside of the positioning rod 8 and is used to connect with the fixing hole on the air intake pipe body by screws to clamp the positioning rod 8. A flat washer 7 and a first M8 nut 6 for locking are installed on the top of the sealing rod 5. The positioning rod 8 has an L-shaped structure, and its lower end has a bolt hole for fixing. Specifically, to increase the service life of the integrated sealing device for the simulated nozzle, the positioning rod 8, sealing rod 5, and clamping block 9 are all made of 45# steel and heat-treated to achieve a hardness of HRC30-35; the positioning rod 8 is designed according to the specific size requirements of the 8 forming holes II in the intake pipe (e.g., Figure 22 (as shown), 8× The hole spacing dimension is consistent with the position of the 8 forming holes II in the intake pipe, 8× 10mm deep stepped positioning hole through The interference fit is used to install the sealing rod 5, ensuring the perpendicularity and positional accuracy requirements between the two workpieces after installation. (The sealing rod 5...) The outer circle of Ra0.8 and the end face are installed with an interference fit to the φ10H7 stepped positioning hole and the lower end face of the positioning rod 8, ensuring the perpendicularity and positional accuracy requirements between the two workpieces. The dimensions of the lower O-ring 11 installation part are grooved according to the design standard dimensions of φ7.8±0.02×4.5±0.1, ensuring that the O-ring 11 is positioned at point 8 in the air inlet pipe during the sealing test. The clamping block 9 is mainly used to clamp the 4×M6 threaded holes and end faces in the intake pipe. Therefore, its width is designed to be 18mm, the same as the end face size of the 4×M6 threaded holes. To ensure that all four clamping blocks 9 contact the end faces of the 4×M6 threaded holes in the intake pipe simultaneously during the clamping process, the height is designed to be 54±0.1mm. The φ6.5 hole for fixing the 4×M6 screws can only be machined after the intake pipe forming hole II sealing device is welded to ensure the overall drawing size of 25.5±0.1mm. Based on the 8 locations in the intake pipe... Sealing hole size design such as Figure 25The O-ring 11 shown has an inner diameter of φ7.5±0.14 mm to ensure an interference fit with the φ7.8±0.02×4.5±0.1 mm slot in the sealing rod 5, preventing the O-ring 11 from sliding up and down during the sealing test. Its diameter is φ3.55±0.1 mm, so the theoretical outer diameter of the O-ring 11 is φ14.6 mm. This ensures that the O-ring 11 fits snugly against the groove in the sealing rod 5 during the sealing test. The sealing hole has sufficient airtight clamping force, while also allowing for easy removal and insertion.

[0095] The assembly process of the simulated nozzle integrated sealing device is as follows:

[0096] (1) Place the sealing rod 5 in The outer circle is inserted into the positioning rod 8. The positioning rod 8 is positioned in a 10mm deep stepped hole, and an M8 nut and washer are tightened at the upper end of the positioning rod 8 to ensure that the Ra0.8 end face of the sealing rod 5 is in complete contact with the Ra1.6 lower end face of the positioning rod 8.

[0097] (2) Weld the four clamping blocks 9 to the positioning rod 8 to ensure the positional dimensions after welding;

[0098] (3) Machining the φ6.5 holes in the four clamping blocks 9 to ensure the positional dimensions required in the assembly drawing;

[0099] (4) Install the eight O-rings 11 into the grooves of the sealing rod 5 respectively.

[0100] Furthermore, such as Figure 5 , Figure 18 As shown, the test fixture also includes a mounting base sealing fixture installed on the mounting base III. The mounting base sealing fixture includes a sealing base plate 14, which is installed on the lower end of the air intake pipe mounting base III by fastening bolts. A third rubber gasket 13 is pressed between the mounting base III and the sealing base plate 14. The sealing base plate 14 is provided with a plurality of fifth threaded holes aligned with the holes in the mounting base III, and the third rubber gasket 13 is provided with through holes aligned with the holes in the mounting base III.

[0101] An intake pipe sealing test method, using the above-mentioned test fixture, includes the following steps:

[0102] Step 1, Install the bottom seal: First, place the third rubber gasket 13 on the sealing base plate 14, then cover the third rubber gasket 13 with the mounting base III of the air intake pipe, ensuring that the holes of the three are aligned; then, use the first bolt 3 and the third bolt 12 to pass through the corresponding holes and screw them into the fifth threaded hole of the sealing base plate 14, and use the tightening force of the bolts to press the third rubber gasket 13 between the mounting base III and the sealing base plate 14, thereby achieving a seal;

[0103] Specifically, (1) the third rubber pad 13 is placed on the sealing bottom plate 14, and the hole positions are aligned;

[0104] (2) the intake pipe installation bottom surface III is placed on the third rubber pad 13, and the front and rear two rows of 8xφ9 holes in the intake pipe are aligned with the 16xφ9 holes in the third rubber pad 13 and the 16xM8 threaded holes in the sealing bottom plate 14;

[0105] (3) the first bolt 3 and the third bolt 12 are respectively placed in the front and rear two rows of 8xφ9 holes in the intake pipe through the second rubber pad 4, and are connected and tightened with the M8 bolt and the fifth threaded hole in the sealing bottom plate 14, which is used for sealing the intake pipe installation bottom surface.

[0106] Step 2, sealing of the forming hole: the eight sealing rods 5 with O-shaped sealing rings 11 installed in the simulation nozzle integrated sealing device are respectively pressed into the eight forming holes II of the intake pipe, the upper end is pressed on the positioning rod 8, the flat pad 7 and the first M8 nut 6 are respectively installed on the sealing rod 5 and tightened and fixed, and the second bolt 10 is used to fix the pressing block 9 on the corresponding threaded hole on the intake pipe body, so as to realize the sealing of the forming hole II;

[0107] Specifically, the eight sealing rods 5 with O-shaped sealing rings 11 installed are respectively pressed into the eight forming holes II of the intake pipe, the lower end faces of the four pressing blocks 9 are respectively in contact with the end faces of the 4xM6 threaded holes in the intake pipe, and the four second bolts 10 are tightened and fixed, so as to complete the sealing of the eight forming hole surfaces of the intake pipe.

[0108] Step 3, pipe mouth sealing:

[0109] 3.1 Assemble the radial clamping device and the axial pressing device in the shaft radial integrated sealing device together, and install the gas-tight joint 2 on the axial pressing device;

[0110] 3.2 Pre-adjust the radial size: rotate the first movable handle 15 in the radial clamping device counterclockwise for four to five turns, so that the diameter of the φ100 clamping circle composed of the clamping ring 20 and the support frame 18 increases to φ104-φ105mm (greater than the maximum size φ103mm of the φ100 pipe mouth of the intake pipe), so as to facilitate the clamping circle to be put into the intake pipe;

[0111] 3.3 Pre-adjust the axial space: rotate the second movable handle 25 in the axial pressing device counterclockwise for four to five turns, so that the space distance between the lower end face of the lower rubber pad 29 and the upper end face of the support frame 18 increases to 13-14mm (greater than the minimum length size 12mm of the φ100 diameter part from the upper end face to the lower end face of the φ100 pipe mouth of the intake pipe), which reserves the pressing stroke;

[0112] 3.4 installation and locking: the adjusted clamping ring is put into the pipe I, and the rubber pad 29 is in contact with the end face of the pipe I; then the first movable handle 15 is rotated clockwise to drive the clamping ring 20 to clamp the pipe wall radially (so as to drive the clamping ring 20 connected with it to clamp the pipe I of the inlet pipe φ100 radially); then the second movable handle 25 is rotated clockwise to drive the lower support plate 28 and the lower rubber pad 29 to press the end face of the pipe I (so as to drive the lower support plate 28 and the lower rubber pad 29 connected with it to press the pipe I of the inlet pipe φ100 axially);

[0113] Step 4, pressure test and disassembly: pressure medium is introduced into the sealed inlet pipe to test the sealing performance; after the test is completed, the axial sealing device, the simulation nozzle integrated sealing device and the installation bottom sealing clamp are operated in reverse order to disassemble the inlet pipe. The time is about 5 minutes.

[0114] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A sealing test fixture for an air intake pipe, characterized in that: It includes an integrated axial and radial sealing device installed on the end face of the φ100 inlet (Ⅰ) of the air intake pipe and an integrated simulated nozzle sealing device installed on the end face of eight forming holes; the integrated axial and radial sealing device achieves compression sealing by rotating the first radial movable handle (15) and the second axial movable handle (25) respectively, thereby driving the clamping ring (20) and the lower support plate (28); the integrated simulated nozzle sealing device achieves sealing of the forming hole (Ⅱ) by the force extrusion deformation between the O-ring (11) and the sealing hole.

2. The sealing test fixture for an air intake pipe according to claim 1, characterized in that: The integrated axial and radial sealing device includes a radial clamping device and an axial pressing device; The radial clamping device includes a support frame (18) fitted on the outside of the pipe opening (I), a clamping ring (20) installed inside the support frame (18), and a first movable handle (15) located outside the support frame (18). The support frame (18) is connected and fixed to the axial clamping device by a support bolt (22). A pressure block (19) is fixed on the outside of the clamping ring (20). The pressure block (19) is connected to a first M10 nut (17) welded to the support frame (18) by a first clamping screw (16), thereby realizing reliable transmission of clamping force and having an anti-loosening function. The first movable handle (15) is installed at the end of the first clamping screw (16) and is used to provide the required torque during operation. The axial clamping device includes an upper support plate (23), a lower support plate (28), and a second clamping screw (26). The upper support plate (23) is fixedly connected to the radial clamping device by support bolts (22) at both ends, and a second M10 nut (27) is welded on its upper part for screwing in the second clamping screw (26). The lower support plate (28) is located at the upper end of the pipe opening (I), and a lower rubber pad (29) is provided between the two. The lower support plate (28) is clearance-fitted with the support bolts (22) to provide guidance, and is connected to the upper support plate (23) by the second clamping screw (26). The top of the second clamping screw (26) is equipped with a second movable handle (25) for providing operating torque. An airtight connector (2) for connecting compressed air is also installed on the lower support plate (28).

3. The sealing test fixture for an air intake pipe according to claim 2, characterized in that: The support frame (18) is composed of a square frame (18-1) and an arc frame (18-2), which are placed on both sides of the support. At the connection point, there is an ear plate (18-3) with a connection hole (18-4), which is used to pass through the support bolt (22). A first threaded hole (18-5) is opened on the square frame (18-1), and a first M10 nut (17) is welded to its outer side.

4. The sealing test fixture for an air intake pipe according to claim 2, characterized in that: The side of the pressure block (19) that contacts the clamping ring (20) is an arc-shaped surface (19-1); a countersunk hole (19-3) is provided inside the pressure block (19), and a second threaded hole (19-2) is provided at the outer end of the countersunk hole; a chamfer (19-4) is provided on the side of the pressure block (19) that is away from the arc-shaped surface (19-1).

5. The sealing test fixture for an air intake pipe according to claim 2, characterized in that: The upper support plate (23) is symmetrically "waist-shaped" with rounded edges; the two ends of the upper support plate (23) are provided with bolt holes for the support bolts (22) to pass through; the middle is provided with a third threaded hole for the second clamping screw (26) to pass through; The lower support plate (28) has a flat profile that is symmetrical from left to right. The upper and lower edges are large arcs, and the left and right sides are connected by inclined straight edges. The hole areas at both ends are transitioned by small arcs. The lower support plate (28) has through holes at both ends for the support bolts (22) to pass through. A boss is provided in the middle position. A fourth threaded hole is provided in the boss for the second clamping screw (26) to be screwed in. An installation hole for installing the airtight connector (2) is provided on one side of the boss.

6. The sealing test fixture for an air intake pipe according to claim 2, characterized in that: Both sides of the first movable handle (15) and the second movable handle (25) are provided with retaining rings (24) to prevent them from falling off.

7. The sealing test fixture for an air intake pipe according to claim 2, characterized in that: The angular envelope of the clamping ring (20) is 96°.

8. The sealing test fixture for an air intake pipe according to claim 1, characterized in that: The simulated nozzle integrated sealing device includes a positioning rod (8), eight sealing rods (5), four clamping blocks (9), and eight O-ring seals (11). The positioning rod (8) is positioned above the eight forming holes (II). The positioning rod (8) has eight stepped positioning holes, and the positions of the stepped positioning holes are consistent with the positions of the eight forming holes (II). The upper end of each sealing rod (5) is installed in the stepped positioning hole by interference fit. The lower end of each sealing rod (5) extends into the corresponding forming hole (II), and the lower end of each sealing rod (5) has a slot. The O-ring seals (11) are installed in the slot. The clamping block (9) is fixedly set on the outside of the positioning rod (8) and is used to connect with the fixing hole on the air intake pipe body by screws to press the positioning rod (8). The top of the sealing rod (5) is equipped with a flat washer (7) and a first M8 nut (6) for locking. The positioning rod (8) has an L-shaped structure and its lower end is provided with a bolt hole for fixing.

9. The sealing test fixture for an air intake pipe according to claim 1, characterized in that: The test fixture also includes a mounting bottom sealing fixture installed on the mounting bottom surface (Ⅲ). The mounting bottom sealing fixture includes a sealing base plate (14), which is installed on the lower end of the air intake pipe mounting bottom surface (Ⅲ) by fastening bolts. A third rubber pad (13) is pressed between the mounting bottom surface (Ⅲ) and the sealing base plate (14). The sealing base plate (14) is provided with a plurality of fifth threaded holes aligned with the holes on the mounting bottom surface (Ⅲ), and the third rubber pad (13) is provided with through holes aligned with the holes on the mounting bottom surface (Ⅲ).

10. A method for testing the sealing of an intake pipe, using the test fixture as described in any one of claims 1-9, characterized in that, Includes the following steps: Step 1, Install bottom seal: First, place the third rubber gasket (13) on the sealing base plate (14), then cover the third rubber gasket (13) with the mounting bottom surface (Ⅲ) of the air intake pipe, ensuring that the holes of the three are aligned; then, use the first bolt (3) and the third bolt (12) to pass through the corresponding holes and screw them into the fifth threaded hole of the sealing base plate (14), and press the third rubber gasket (13) between the mounting bottom surface (Ⅲ) and the sealing base plate (14) by the tightening force of the bolts, thereby achieving a seal; Step 2, forming hole sealing: Press the eight sealing rods (5) with O-rings (11) installed in the integrated sealing device of the simulated nozzle into the eight forming holes (II) of the air inlet pipe respectively, press the positioning rod (8) on the upper end, and then install the flat washer (7) and the first M8 nut (6) on the sealing rod (5) respectively and tighten them. Then use the second bolt (10) to fix the clamping block (9) on the corresponding threaded hole on the air inlet pipe body to achieve the sealing of the forming hole (II); Step 3, sealing the pipe opening: 3.1 Assemble the radial clamping device and the axial pressing device in the integrated axial and radial sealing device together, and install the airtight joint on the axial pressing device (2). 3.2 Pre-adjusting radial dimensions: Rotate the first movable handle (15) in the radial clamping device counterclockwise 4 to 5 turns to increase the diameter of the clamping circle formed by the clamping ring (20) and the support frame (18) to φ104-φ105mm so that the tube opening (Ⅰ) can be inserted. 3.3 Pre-adjust axial space: Rotate the second movable handle (25) in the axial clamping device counterclockwise 4 to 5 turns to increase the space distance between the lower end face of the lower rubber pad (29) and the upper end face of the support frame (18) to 13-14mm, which is to reserve the clamping stroke; 3.4 Installation and locking: Place the adjusted clamping circle into the pipe opening (Ⅰ) so that the lower rubber pad (29) contacts the end face of the pipe opening (Ⅰ); then rotate the first movable handle (15) clockwise to drive the clamping ring (20) to radially clamp the pipe wall; then rotate the second movable handle (25) clockwise to drive the lower support plate (28) and the lower rubber pad (29) to axially press the end face of the pipe opening; Step 4, Pressure Test and Disassembly: Pressurized medium is introduced into the sealed intake pipe to conduct a sealing test; after the test is completed, the axial radial integrated sealing device, the simulated nozzle integrated sealing device mold, and the mounting bottom sealing clamp are operated in reverse order to disassemble the intake pipe.

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