A pressure test tool for a stop valve and a method thereof

Abstract

The application belongs to the technical field of valve pressure test, in particular to a pressure test tool for stop valve and a method thereof; comprising a test bench; two symmetrical half-ring base blocks are installed on the top of the test bench; clamping and braking devices are arranged on the half-ring base blocks; the clamping and braking devices comprise half-ring grooves arranged in the half-ring base blocks and coaxial with each other; the half-ring grooves extend to the two ends of the half-ring base blocks; the two half-ring grooves are located in the moving path of the flanges at the two ends of the stop valve, the flanges and the half-ring grooves are fitted and coaxial with each other; a pressure measuring assembly is arranged on the test bench; the pressure block can be attached to the outer surface of the valve body of the stop valve, so as to avoid missing test data, avoid the local area of the valve body being under too high pressure or not under pressure during testing, and avoid test data distortion, thereby providing a reliable basis for product quality determination, ensuring the safety of the subsequent use of the stop valve, and finally reducing the test limitations of the tool and improving the use effect of the tool.

Description

Technical Field

[0001] This invention belongs to the field of valve pressure testing technology, specifically a pressure testing fixture and method for a gate valve. Background Technology

[0002] Gate valves are forced-seal straight-stroke valves, mainly used for regulating and shutting off the flow of media in pipeline systems. They are a widely used type of valve in industrial production, building water supply and drainage, and other fields. In order to verify the deformation and rupture resistance of their shell structure under rated and ultimate pressure conditions, and to avoid safety accidents and economic losses caused by shell failure, it is necessary to conduct strength tests on gate valves.

[0003] The existing gate valve pressure testing fixtures do not collect complete experimental data during the testing process. They cannot be adapted to gate valves of different shapes and cannot complete accurate strength tests under the fit condition. This results in some areas of the valve body bearing excessive pressure while other areas do not bear effective pressure, thus causing the test data to be distorted. This not only fails to provide a reliable basis for product quality judgment, but also makes it difficult to ensure the safety of the gate valve under test in subsequent use. Ultimately, it expands the testing limitations of the fixtures and reduces their effectiveness. Summary of the Invention

[0004] In view of the above situation and to overcome the defects of the prior art, the present invention provides a pressure testing fixture and method for a shut-off valve, which effectively solves the problems in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pressure testing fixture for a gate valve, comprising a test bench; two symmetrical semi-annular base blocks are mounted on the top of the test bench; clamping and braking devices are provided on the semi-annular base blocks to prevent the gate valve from shifting position during testing and affecting the test results; the clamping and braking devices include semi-annular grooves disposed within the semi-annular base blocks, and the two are coaxial; the two ends of the semi-annular grooves extend to the two ends of the semi-annular base blocks; the two semi-annular grooves are located within the movement path of the flanges at both ends of the gate valve, the flanges and the semi-annular grooves fit together, and their centers are coaxial; a pressure testing component is provided on the test bench for performing strength testing on the gate valve; the pressure testing component includes a pressure block located on the top of the test bench;

[0006] The first base is installed on both sides of the test bench;

[0007] Guide cylinder, connected to the top of the first base;

[0008] The guide slider is connected to the guide cylinder through the side near the test bench; the guide cylinder and the guide slider are in sliding fit.

[0009] The limit connection replacement unit is arranged on the guide sliding block, and is used for conveniently replacing the pressure blocks with different shapes; the limit connection replacement unit comprises a limiting cylinder which is installed on one side of the pressure block close to the test bench; the limiting cylinder is connected to the other side of the guide sliding block away from the test bench; the guide sliding block and the limiting cylinder are in sliding fit; and a plurality of limiting insertion grooves are arranged on the outer wall of the limiting cylinder at equal intervals.

[0010] Preferably, the bit moving screw rod is installed on the opposite sides of the two half-ring base blocks.

[0011] The driving source is installed on the half-ring base block, and the output end of the driving source is connected with the bit moving screw rod.

[0012] The bit moving block is threadedly connected with the bit moving screw rod.

[0013] The bit moving cylinder is installed on the half-ring base block, and the side of the bit moving block close to the half-ring base block is connected with the bit moving cylinder; the bit moving cylinder and the bit moving block are in sliding fit.

[0014] Preferably, the brake cylinder block is connected with the bit moving block.

[0015] The brake cylinder is connected with the side of the brake cylinder block close to the flange plate of the end portion of the stop valve; the brake cylinder block and the brake cylinder are in sliding fit.

[0016] The brake limiting plate is connected with the end of the brake cylinder away from the flange plate.

[0017] The brake clamping plate is connected with the end of the brake cylinder close to the flange plate; the flange plate is located in the moving path of the brake clamping plate.

[0018] The brake spring is sleeved on the brake cylinder; one end of the brake spring is fixedly connected with the brake limiting plate, and the other end is fixedly connected with the brake cylinder block; the brake rod body is further installed on the brake cylinder block; the screw hole on the flange plate is located in the moving path of the brake rod body; the brake insertion column is further installed on the side of the brake clamping plate away from the brake cylinder; the medium flow-through hole on the flange plate is located in the moving path of the brake insertion column; and the medium flow-through hole and the brake insertion column are in engagement fit.

[0019] Preferably, the telescopic air cylinder is installed on the top of the test bench.

[0020] The U-shaped connecting plate is connected with the output end of the telescopic air cylinder; the two ends of the U-shaped connecting plate are connected with the two guide sliding blocks.

[0021] Preferably, the positioning cylinder is connected with the side of the guide sliding block close to the test bench; the positioning cylinder and the guide sliding block are in sliding fit.

[0022] The positioning horizontal plate is installed on the end of the positioning cylinder close to the test bench.

[0023] The positioning spring is sleeved on the positioning cylinder; one end of the positioning spring is fixedly connected with the guide sliding block, and the other end is fixedly connected with the positioning transverse plate; the positioning transverse plate is located on the moving path of the limiting cylinder close to the top of the test table on the side away from the top of the test table.

[0024] Preferably, the second base is installed on both sides of the guide sliding block;

[0025] The limiting sliding rod is connected to the side of the second base; the second base and the limiting sliding rod are in sliding fit; one end of the limiting sliding rod is connected to the limiting circular plate, and the other end is connected to the limiting transverse plate; the limiting transverse plate is located on the side of the limiting slot;

[0026] The limiting spring is sleeved on the limiting sliding rod; one end of the limiting spring is fixedly connected with the limiting circular plate, and the other end is fixedly connected with the second base;

[0027] The limiting plug is installed on the side of the limiting transverse plate close to the limiting slot; when the limiting cylinder reaches the specified position, the limiting plug penetrates through the side of the guide sliding block and is connected with one of the limiting slots.

[0028] Preferably, the test table is further provided with a pressure bearing stop mechanism; the pressure bearing stop mechanism comprises a third base installed on the opposite surfaces of the two half-ring base blocks;

[0029] The energy absorption sliding column is connected to the side of the third base close to the top of the test table; the energy absorption sliding column and the third base are in sliding fit; the energy absorption sliding column is connected with the pressure bearing square plate at the end away from the test table; the pressure bearing square plate is located below the stop valve; the stop valve is located on the moving path of the pressure bearing square plate on the side close to the top of the test table; the energy absorption sliding column is connected with the energy absorption limiting plate at the end close to the test table;

[0030] The energy absorption spring is sleeved on the energy absorption sliding column; one end of the energy absorption spring is fixedly connected with the third base, and the other end is fixedly connected with the energy absorption limiting plate.

[0031] Preferably, the directional cylinder is installed on the energy absorption limiting plate; the directional cylinder extends to the bottom of the test table at the end away from the energy absorption limiting plate; the directional cylinder and the test table are in sliding fit;

[0032] The directional sliding plate is located at the bottom of the test table; the directional sliding plate is connected to the directional cylinder at the side close to the bottom of the test table; the directional cylinder and the directional sliding plate are in sliding fit;

[0033] The directional spring is sleeved on the directional cylinder; one end of the directional spring is fixedly connected with the bottom of the test table, and the other end is fixedly connected with the directional sliding plate; the directional sliding plate is installed with an extension block; the extension block is connected with a directional rack; the directional rack is installed with a sliding rail; the test table is installed with a fourth base; the sliding rail is connected in the fourth base in a fitting manner, and the two are in sliding fit.

[0034] Preferably, the retaining square seat is installed on the guide slider;

[0035] The fixed pulley is connected to the first base;

[0036] The winding roller is located at the bottom of the test bench, and the rotating shaft is connected to the winding roller;

[0037] The fifth base is connected to the bottom of the test bench, and the rotating shaft is connected to the fifth base; the clockwork spring is installed on the rotating shaft, and the end of the clockwork spring is fixedly connected to the fifth base;

[0038] The cable is connected to the retaining square seat at one end, and is wound on the winding roller after passing through the fixed pulley;

[0039] The directional gear is connected to the end of the rotating shaft away from the fifth base; the directional gear is meshingly connected with the directional rack.

[0040] The application further provides a use method of the test pressure tool of the stop valve, and the method comprises the following steps:

[0041] S1, the stop valve is placed on the semi-ring base, the flanges at both ends of the stop valve are embedded into the semi-ring groove, and the clamping and braking device is operated to clamp and fix the stop valve;

[0042] S2, the pressure measuring assembly is started, the pressure block is driven to move towards the stop valve body, and the pressure block is tightly attached to the outer surface of the valve body until the pressure block is tightly attached to the outer surface of the valve body;

[0043] S3, after the pressure block is attached to the valve body, the pressure block continuously applies pressure to the valve body through the pressure measuring assembly until the pressure reaches a preset value, whether the surface of the stop valve is cracked, deformed or damaged is observed and recorded, and the strength test of the stop valve is completed.

[0044] Compared with the prior art, the application has the following beneficial effects:

[0045] (1) The limiting block resets the movement, passes through the guide slider, and is connected with one of the limiting slots, so as to limit the installation of the limiting cylinder, thereby completing the installation of the pressure block; since the number of limiting slots is several, the pressure block can be installed at different heights for operation, reducing the limitation of tool use; at the same time, after the installation of the pressure block is completed, the positioning spring in the buffer state cannot be reset, and the elastic force acts on the limiting cylinder, thereby increasing the contact friction and strength of the limiting slot and the limiting block, avoiding dislocation of the pressure block due to non-human factors during use, improving the use effect of the tool; the tool can be conveniently and quickly installed and removed without the aid of any tool, facilitating the replacement of pressure blocks of different shapes, avoiding the operation from being unable to proceed smoothly due to the lack of tools during the replacement process, reducing the limitation of tool use, so that the tool can adapt to different shapes of stop valves for testing, so that the pressure block is in close contact with the outer surface of the valve body of the stop valve, avoiding missing test data, ensuring accurate strength testing under the condition that the pressure block is in close contact with the valve body, avoiding distortion of test data caused by excessive pressure or no pressure on the local area of the valve body during testing, thereby providing a reliable basis for product quality determination, while ensuring the safety of the subsequent use of the stop valve, finally reducing the testing limitation of the tool, improving the use and testing effect;

[0046] (2) The two brake clamps move relative to each other, thereby contacting the two sides of the two flange plates, thereby clamping the stop valve, avoiding shaking or dislocation during testing, which affects the test results, improving the testing effect of the tool on the stop valve and the accuracy of the test results; before the brake clamp contacts the flange plate, the brake column on the brake clamp enters the medium flow hole of the flange plate first, thereby positioning the stop valve to be clamped and fixed, so as to prevent the test position from changing due to the deviation of the position during clamping, further avoiding dislocation of the stop valve during clamping due to non-human factors, thereby improving the testing accuracy of the tool on the stop valve; it is worth mentioning that when the brake clamp contacts the flange plate, the brake block on the brake clamp moves in the brake cylinder of the brake clamp, so that the brake spring is in a buffer state, further increasing the contact force and friction between the brake clamp and the flange plate, thereby further improving the clamping effect of the stop valve and improving the testing effect; at the same time, when the brake clamp stops moving, the brake block continues to move, so that the brake rod on the brake block enters the screw hole on the flange plate, thereby limiting the angle position of the flange plate, avoiding angle changes caused by excessive pressure on the valve body or other non-human factors during testing, so that the valve body can always be at the moving position of the pressure block for testing, thereby reducing the limitation of tool use and improving the use effect;

[0047] (3) The directional sliding plate moves close to the bottom of the test bench, and under the action of the directional cylinder and the directional spring, the energy-absorbing limiting plate is driven to move upwards, the directional spring is in a buffering state, the energy-absorbing slide column on the energy-absorbing limiting plate is limited to move on the third base, the energy-absorbing spring is in a buffering state, thereby driving the pressure bearing square plate to move upwards and contact the bottom of the stop valve to support the stop valve while cooperating with the downward moving pressure block to synchronously apply pressure to the upper and lower sides of the stop valve, thereby reducing the test time of unilateral pressure application, improving the test efficiency of the tooling, avoiding the existence of dead angles in the pressure application area to cause some areas of the valve body not to be applied with pressure, thereby improving the test effect of the stop valve, ensuring the accuracy of the tooling during testing, and further improving the use effect of the tooling; it is worth mentioning that the buffering force brought by the energy-absorbing spring and the directional spring, when the valve body under pressure cannot withstand the pressure brought by the test and is broken or damaged, the force of the pressure block acting on the valve body is suddenly applied to the pressure bearing square plate, and the force generated when the valve body is damaged is also applied to the pressure bearing square plate, at this time, the above-mentioned buffering force can reduce the impact force caused by the damage of the valve body of the stop valve, improve the service life of the tooling, and improve the use effect, thereby avoiding damage during the test process of the tooling;

[0048] (4) The pressure block installed on the two guide sliding blocks moves close to the valve body on the fixed stop valve, the pressure block contacts the valve body of the stop valve, and the pressure block is continuously operated by the telescopic cylinder to apply pressure to the valve body, thereby completing the strength test of the stop valve, and after the pressure value of the valve body is increased to the required value for the test, whether the valve body is broken or cracked can be determined by observing the valve body, thereby completing the pressure test operation of the stop valve; it is worth mentioning that the shape of the pressure block for the pressure test operation of the valve body of the stop valve is matched with the outer surface of the valve body, so that the outer surface of the valve body of the stop valve can be tested in a precise and strong manner in a state of close contact with the pressure block, thereby avoiding excessive pressure on the local area of the valve body or the lack of effective pressure, so that the test data cannot be distorted, ensuring the product quality, and reliably guaranteeing the quality determination basis, thereby further improving the safety of the stop valve, reducing the test limitations of the tooling, and improving the use effect of the tooling. BRIEF DESCRIPTION OF DRAWINGS

[0049] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application together with the embodiments thereof, and do not constitute a limitation of the present application.

[0050] In the drawings:

[0051] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0052] Figure 2 It is a schematic diagram of the fixed pulley structure of the present application;

[0053] Figure 3 The schematic diagram of the pressure plate structure of the present application;

[0054] Figure 4 The schematic diagram of the telescopic air cylinder structure of the present application;

[0055] Figure 5 The front view of the brake insertion column of the present application;

[0056] Figure 6 The schematic diagram of the winding roller structure of the present application;

[0057] Figure 7 The exploded view of the semi-ring groove of the present application;

[0058] Figure 8 The sectional view of the pressure block of the present application;

[0059] Figure 9 The schematic diagram of the directional sliding plate structure of the present application;

[0060] Figure 10 The schematic diagram of the semi-ring base block structure of the present application;

[0061] Figure 11 The sectional view of the guide sliding block of the present application;

[0062] Figure 12 The front sectional view of the extension block of the present application;

[0063] Figure 13 The exploded view of the limiting cylinder of the present application;

[0064] Figure 14 The schematic diagram of the brake round block structure of the present application;

[0065] In the figure: 1, test bench; 2, half ring base block; 3, half ring groove; 4, pressure block; 5, first base; 6, guide cylinder; 7, guide sliding block; 8, limiting cylinder; 9, limiting slot; 10, position moving lead screw; 11, driving source; 12, position moving square; 13, position moving cylinder; 14, brake round block; 15, brake cylinder; 16, brake clamping plate; 17, brake spring; 18, brake rod body; 19, brake insertion column; 20, telescopic air cylinder; 21, U-shaped connecting plate; 22, positioning cylinder; 23, positioning cross plate; 24, positioning spring; 25, second base; 26, limiting sliding rod; 27, limiting cross plate; 28, limiting spring; 29, limiting insertion block; 30, third base; 31, energy absorbing sliding column; 32, pressure bearing square plate; 33, energy absorbing limiting plate; 34, energy absorbing spring; 35, directional cylinder; 36, directional sliding plate; 37, directional spring; 38, extension block body; 39, directional rack; 40, slide rail; 41, fourth base; 42, retaining square seat; 43, fixed pulley; 44, winding roller; 45, rotating shaft; 46, fifth base; 47, clockwork spring; 48, cable; 49, directional gear. DETAILED DESCRIPTION

[0066] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0067] Embodiments, by Figures 1 to 14The present application comprises a test bench 1, two symmetrical half-ring base blocks 2 are installed on the top of the test bench 1, clamping braking devices are arranged on the half-ring base blocks 2 to prevent the position deviation of the stop valve from affecting the test results during the test, the clamping braking devices comprise half-ring grooves 3 arranged in the half-ring base blocks 2 and coaxial with each other, the half-ring grooves 3 extend to the two ends of the half-ring base blocks 2, the two half-ring grooves 3 are located in the moving path of the flanges at the two ends of the stop valve, the flanges and the half-ring grooves 3 are fitted and coaxial with each other, a position adjusting lead screw 10 is installed on the opposite sides of the two half-ring base blocks 2, a driving source 11 is installed on the half-ring base blocks 2, the output end of the driving source 11 is connected with the position adjusting lead screw 10, a position adjusting block 12 is threadedly connected with the position adjusting lead screw 10, a position adjusting cylinder 13 is installed on the half-ring base blocks 2, the position adjusting block 12 is connected with the position adjusting cylinder 13 on the side close to the half-ring base blocks 2, the position adjusting cylinder 13 and the position adjusting block 12 are in sliding fit, a braking block 14 is connected with the position adjusting block 12, a braking cylinder 15 is connected with the braking block 14 on the side close to the flanges at the end of the stop valve, the braking block 14 and the braking cylinder 15 are in sliding fit, a braking limiting plate is connected with the end of the braking cylinder 15 away from the flanges, a braking clamp plate 16 is connected with the end of the braking cylinder 15 close to the flanges, the flanges are located in the moving path of the braking clamp plate 16, a braking spring 17 is sleeved on the braking cylinder 15, one end of the braking spring 17 is fixedly connected with the braking limiting plate and the other end is fixedly connected with the braking block 14, a braking lever body 18 is further installed on the braking block 14, the threaded holes on the flanges are located in the moving path of the braking lever body 18, a braking insertion column 19 is further installed on the side of the braking clamp plate 16 away from the braking cylinder 15, the medium flow holes on the flanges are located in the moving path of the braking insertion column 19, the medium flow holes and the braking insertion column 19 are in fitted fit;

[0068] The flange plate on the stop valve is placed in the semi-ring groove 3 on the semi-ring base block 2, that is, the stop valve is preliminarily positioned, the driving source 11 is started, the output end drives the position moving lead screw 10 to rotate, the threaded position moving block 12 moves along the position moving cylinder 13 to approach the semi-ring base block 2, the position moving block 12 drives the brake circular block 14 to move, the brake clamping plate 16 is driven by the brake circular cylinder 15 and the brake spring 17 to move, the brake clamping plate 16 approaches the side surface of the flange plate, the two brake clamping plates 16 on the opposite sides of the two flanges on both ends of the stop valve move relatively, and contact the two flanges on both sides, so that the stop valve is clamped and arranged, the test result is avoided from being affected by shaking or dislocation of the stop valve during the test, the test effect of the tool on the stop valve and the precision of the test result are improved; before the brake clamping plate 16 contacts the flange plate, the brake plug column 19 on the brake clamping plate 16 enters the medium flow hole of the flange plate in advance, so that the stop valve to be clamped and fixed is positioned, the position deviation of the stop valve during clamping is prevented, the test position is changed, the dislocation of the stop valve caused by non-human factors during the clamping process is further avoided, and the test precision of the tool on the stop valve is improved; it is worth mentioning that when the brake clamping plate 16 contacts the flange plate, the brake circular block 14 on the position moving block 12 moves continuously by the position moving lead screw 10, the brake circular cylinder 15 on the brake clamping plate 16 is limited to move, the brake spring 17 is in a buffering state, the contact force and friction between the brake clamping plate 16 and the flange plate are further increased, the clamping effect on the stop valve is further improved, the test effect is improved, and simultaneously when the brake clamping plate 16 stops moving, the brake rod body 18 on the brake circular block 14 enters the screw hole on the flange plate, the angle position of the flange plate is limited, the angle is changed due to excessive pressure on the valve body or other non-human factors during the test, the valve body can be tested at the moving position of the pressure block 4 at all times, the use limitation of the tool is reduced, and the use effect is improved.

[0069] The test bench 1 of the embodiment is provided with a pressure applying and strength testing assembly for testing the strength of the stop valve; the pressure applying and strength testing assembly comprises a pressure block 4 located at the top of the test bench 1, a first base 5 installed on the two sides of the test bench 1, a guide cylinder 6 connected to the top of the first base 5, a guide sliding block 7 penetratingly connected to the guide cylinder 6 near one side of the test bench 1, and the guide cylinder 6 and the guide sliding block 7 are in sliding cooperation, a telescopic cylinder 20 installed at the top of the test bench 1, a U-shaped connecting plate 21 connected to the output end of the telescopic cylinder 20, and the two ends of the U-shaped connecting plate 21 are connected with two guide sliding blocks 7; the top of the test bench 1 is also provided with a semi-ring plate located at the other end of the stop valve except the two ends, and one semi-ring plate and two semi-ring base blocks 2 are combined to form a T-shaped structure.

[0070] The cut-off valve to be tested is placed on the semi-ring base 2 on the test bench 1, the flanges at both ends of the cut-off valve are placed in the semi-ring groove 3, and the other end of the cut-off valve is placed on the semi-ring plate, so that the cut-off valve shaped like a T is supported by the T-shaped combination of the two semi-ring bases 2 and the semi-ring plate, which is used to limit the cut-off valve while its three ends are limited, so that the limited cut-off valve cannot rotate or sway, etc., and the clamping and braking means can be operated to further limit and fix the cut-off valve placed on the two semi-ring bases 2 and the semi-ring plate, avoiding dislocation or swinging of the cut-off valve due to excessive force during testing, improving the testing accuracy and stability of the cut-off valve during testing, and improving the testing and use effect of the tool; the specific testing steps after fixing the cut-off valve are: starting the telescopic cylinder 20 to drive the U-shaped connecting plate 21 on its output end to move downward, so that the two guide sliding blocks 7 on it move downward on the guide cylinder 6, so that the pressure block 4 installed on the two guide sliding blocks 7 can move close to the valve body of the fixed cut-off valve, the pressure block 4 contacts the valve body of the cut-off valve, and the pressure block 4 is continuously operated by the telescopic cylinder 20 to press the valve body, that is, the strength test of the cut-off valve can be completed, and after the pressure value on the valve body is increased to the required value for testing, whether the cut-off valve strength meets the standard can be determined by observing whether the valve body is broken or cracked, thereby completing the pressure test operation of the cut-off valve; it is worth mentioning that the shape of the pressure block 4 for pressure test operation of the cut-off valve body is matched with the outer surface of the valve body, so that the outer surface of the cut-off valve body can be accurately tested in the state of close contact with the pressure block 4 during testing, avoiding excessive pressure on the local area of the valve body or not getting effective pressure, so that the test data cannot exist distortion phenomenon, ensuring the product quality, at the same time, the quality judgment basis is reliably guaranteed, further improving the safety of the cut-off valve, thereby reducing the testing limitations of the tool, and improving the use effect of the tool.

[0071] The guiding slider 7 of the embodiment is provided with a limiting replacement unit for conveniently replacing pressure blocks 4 of different shapes. The limiting replacement unit comprises a limiting cylinder 8 installed on the side of the pressure block 4 close to the test bed 1; the limiting cylinder 8 is connected to the side of the guiding slider 7 away from the test bed 1; the guiding slider 7 and the limiting cylinder 8 are in sliding fit; a plurality of limiting insertion slots 9 are arranged at equal intervals on the outer wall of the limiting cylinder 8; a positioning cylinder 22 is connected to the side of the guiding slider 7 close to the test bed 1; the positioning cylinder 22 and the guiding slider 7 are in sliding fit; a positioning transverse plate 23 is installed on the end of the positioning cylinder 22 close to the test bed 1; a positioning spring 24 is sleeved on the positioning cylinder 22; one end of the positioning spring 24 is fixedly connected with the guiding slider 7, and the other end is fixedly connected with the positioning transverse plate 23; the side of the positioning transverse plate 23 away from the top of the test bed 1 is located on the movement path of the end of the limiting cylinder 8 close to the top of the test bed 1; a second base 25 is installed on both sides of the guiding slider 7; a limiting sliding rod 26 is connected to the side of the second base 25; the second base 25 and the limiting sliding rod 26 are in sliding fit; one end of the limiting sliding rod 26 is connected with a limiting circular plate, and the other end is connected with a limiting transverse plate 27; the limiting transverse plate 27 is located on the side of the limiting insertion slot 9; a limiting spring 28 is sleeved on the limiting sliding rod 26; one end of the limiting spring 28 is fixedly connected with the limiting circular plate, and the other end is fixedly connected with the second base 25; a limiting insertion block 29 is installed on the side of the limiting transverse plate 27 close to the limiting insertion slot 9; when the limiting cylinder 8 reaches the specified position, the limiting insertion block 29 passes through the side of the guiding slider 7 and is connected with one of the limiting insertion slots 9;

[0072] The shape of the tested stop valve is different each time when the tool is tested, and the pressure block 4 matched with the outer surface of the stop valve body is used to completely and accurately test the strength of the stop valve; by pulling the limiting transverse plate 27 outward, the limiting transverse plate 27 is limited to move at the second base 25 through the limiting slide rod 26, so that the limiting spring 28 is in a buffering state, and then the limiting plug 29 on the limiting transverse plate 27 is separated from the guide sliding block 7 and is no longer connected with the limiting slot 9, thereby releasing the limiting setting of the limiting cylinder 8, so that the positioning spring 24 in the buffering state is no longer limited to reset, and the positioning transverse plate 23 is reset and moved through the reset of the positioning spring 24, so that the limiting cylinder 8 on the positioning transverse plate 23 is ejected, so that it is no longer connected with the guide sliding block 7, thereby the pressure block 4 on the limiting cylinder 8 is ejected, and the dismounting operation is completed; when the tool is used to test the stop valve, different shapes of stop valves are encountered, and the pressure block 4 matched with the outer surface shape of the stop valve body is selected, the limiting cylinder 8 is aligned with the hole on the guide sliding block 7 and inserted, the limiting cylinder 8 is limited to move on the guide sliding block 7, and the limiting cylinder 8 contacts the positioning transverse plate 23, so that the positioning cylinder 22 on the positioning transverse plate 23 is limited to move on the guide sliding block 7, so that the positioning spring 24 is in a buffering state, until the pressure block 4 is moved to the specified mounting position, one of the limiting slots 9 on the limiting cylinder 8 is aligned with the limiting plug 29, the limiting spring 28 in the buffering state is reset by loosening the limiting transverse plate 27, the limiting plug 29 on the limiting transverse plate 27 is reset and moved, passes through the guide sliding block 7 and is connected with one of the limiting slots 9, the limiting cylinder 8 is limited to set, thereby the installation of the pressure block 4 is completed; since the number of limiting slots 9 is several, the pressure block 4 can be installed at different heights for work, thereby reducing the limitation of the use of the tool; at the same time, after the installation of the pressure block 4 is completed, the positioning spring 24 in the buffering state cannot be reset, the elastic force acts on the limiting cylinder 8, thereby increasing the contact friction force and strength of the limiting slot 9 and the limiting plug 29, avoiding dislocation of the pressure block 4 due to non-human factors during use, and improving the use effect of the tool; the tool can be conveniently and quickly dismounted and mounted without any tool, different shapes of pressure blocks 4 can be replaced, the operation cannot be smoothly performed during the replacement process due to the lack of tools, the limitation of the use of the tool is reduced, thereby the tool can be adapted to different shapes of stop valves for testing, the pressure block 4 is matched with the outer surface of the valve body of the stop valve, the test data is avoided to be missed, the accurate strength test is completed under the condition that the pressure block is closely matched with the valve body, the test data is avoided to be distorted due to the local area of the valve body being pressed too high or not being pressed during the test, thereby reliable basis can be provided for product quality determination, the safety of the subsequent use of the stop valve is also ensured, and finally the test limitation of the tool is reduced, and the use and test effect of the tool is improved.

[0073] The test bench 1 of the embodiment is also provided with a pressure bearing and shock stopping mechanism; the pressure bearing and shock stopping mechanism comprises a third base 30 installed on the opposite faces of the two half-ring base blocks 2; an energy absorbing slide column 31 is connected to the third base 30 near the side of the top of the test bench 1 in a penetrating manner; the energy absorbing slide column 31 is in sliding fit with the third base 30; a pressure bearing square plate 32 is connected to the end of the energy absorbing slide column 31 away from the test bench 1; the pressure bearing square plate 32 is located below the stop valve; the stop valve is located on the moving path of the pressure bearing square plate 32 near the side of the top of the test bench 1; an energy absorbing limiting plate 33 is connected to the end of the energy absorbing slide column 31 near the test bench 1; an energy absorbing spring 34 is sleeved on the energy absorbing slide column 31; one end of the energy absorbing spring 34 is fixedly connected with the third base 30, and the other end is fixedly connected with the energy absorbing limiting plate 33; a directional cylinder 35 is installed on the energy absorbing limiting plate 33; the directional cylinder 35 extends to the bottom of the test bench 1 in a penetrating manner from the end of the directional cylinder 35 away from the energy absorbing limiting plate 33; the directional cylinder 35 is in sliding fit with the test bench 1; a directional slide plate 36 is located at the bottom of the test bench 1; the directional slide plate 36 is connected to the directional cylinder 35 in a penetrating manner near the side of the bottom of the test bench 1; the directional cylinder 35 and the directional slide plate 36 are in sliding fit; a directional spring 37 is sleeved on the directional cylinder 35; one end of the directional spring 37 is fixedly connected with the bottom of the test bench 1, and the other end is fixedly connected with the directional slide plate 36; an extension block 38 is installed on the directional slide plate 36; a directional rack 39 is connected to the extension block 38; a slide rail 40 is installed on the directional rack 39; a fourth base 41 is installed at the bottom of the test bench 1; the slide rail 40 is connected to the fourth base 41 in a fitting manner, and the two are in sliding fit; a fixing square seat 42 is installed on the guide slide block 7; a fixed pulley 43 is connected to the first base 5; a winding roller 44 is located at the bottom of the test bench 1; a rotating shaft 45 is connected to the winding roller 44; a fifth base 46 is connected to the bottom of the test bench 1; the rotating shaft 45 is connected to the fifth base 46; a clockwork spring 47 is installed on the rotating shaft 45; the clockwork spring 47 is fixedly connected with the fifth base 46 at the end points; a cable 48 is connected to the fixing square seat 42 at one end, and is wound on the winding roller 44 after passing through the fixed pulley 43 at the other end; a directional gear 49 is connected to the end of the rotating shaft 45 away from the fifth base 46; the directional gear 49 and the directional rack 39 are connected in meshing manner;

[0074] The guiding sliding block 7 drives the pressure block 4 to move downward, so that the retaining square seat 42 on the guiding sliding block 7 moves downward, and the retaining square seat 42 no longer generates a force on the clock spring 47 under the action of the cable 48 and the fixed pulley 43, so that the clock spring 47 is reset by rotating the winding roller 44 driven by the rotating shaft 45, so that the cable 48 is wound on the winding roller 44, thereby driving the directional gear 49 to rotate, so that the directional gear 49 meshes with the directional rack 39 to move, so that the directional rack 39 moves close to the bottom of the test bench 1, so that the directional rack 39 is limited to move on the fourth base 41 through the slide rail 40, thereby driving the extension block 38 to move, so that the directional sliding plate 36 on the extension block 38 moves close to the bottom of the test bench 1, thereby driving the energy-absorbing limiting plate 33 to move upward under the action of the directional cylinder 35 and the directional spring 37, the directional spring 37 is in a buffering state, so that the energy-absorbing sliding column 31 on the energy-absorbing limiting plate 33 is limited to move on the third base 30, so that the energy-absorbing spring 34 is in a buffering state, thereby driving the pressure-bearing square plate 32 to move upward, so that the pressure-bearing square plate 32 contacts the bottom of the stop valve, and supports the stop valve, and cooperates with the downward moving pressure block 4 to synchronously apply pressure to the upper and lower sides of the stop valve, reduces the test time of unilateral pressure application, improves the test efficiency of the tool, avoids the existence of dead angles in the pressure application area, causes some areas of the valve body to not be subjected to pressure, thereby improving the test effect of the stop valve, and the precision of the tool during testing is guaranteed, and the use effect of the tool is further improved; it is worth mentioning that the buffering force brought by the energy-absorbing spring 34 and the directional spring 37, when the valve body subjected to pressure cannot withstand the pressure brought by the test and is broken or damaged, the force acting on the valve body by the pressure block 4 is suddenly applied to the pressure-bearing square plate 32, and the force generated when the valve body is damaged is also applied to the pressure-bearing square plate 32, at this time, the above-mentioned buffering force can reduce the impact force caused by the damage of the valve body of the stop valve, prolong the service life of the tool, improve the use effect of the tool, and avoid damage caused by the tool during the test process.

[0075] The application also provides a use method of the pressure test tool of the stop valve, including the following steps:

[0076] S1, place the stop valve on the semi-ring base block 2, embed the flange plates at both ends of the stop valve into the semi-ring groove 3, and operate the clamping and braking device to clamp and fix the stop valve;

[0077] S2, start the pressure test and strength test assembly, drive the pressure block 4 to move towards the valve body of the stop valve until the pressure block 4 is tightly attached to the outer surface of the valve body;

[0078] S3, after the pressure block 4 is attached to the valve body, the pressure test and strength test assembly controls the pressure block 4 to continuously apply pressure to the valve body until the pressure reaches a preset value, and whether the stop valve surface is broken, deformed or damaged is observed and recorded, and the strength test of the stop valve is completed.

[0079] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the scope of the present application is not limited to these specific embodiments.

[0080] While the embodiments of the application have been shown and described herein, it will be understood by those skilled in the art that many changes, modifications, substitutions and alterations to these embodiments can be made without departing from the principles and spirits of the application, and it is intended that the scope of the application be limited solely by the scope of the appended claims and the equivalents thereof.

Claims

1. A pressure testing fixture for a shut-off valve, comprising a test bench; characterized in that: Two symmetrical semi-annular base blocks are installed on the top of the test bench. Clamping and braking devices are provided on the semi-annular base blocks to prevent the shut-off valve from shifting position during testing and affecting the test results. Each clamping and braking device includes a semi-annular groove disposed within the semi-annular base block, with both grooves having coaxial centers. The two ends of the semi-annular groove extend to the two ends of the semi-annular base block. The two semi-annular grooves are located within the movement path of the flanges at both ends of the shut-off valve, with the flanges and semi-annular grooves fitting together and having coaxial centers. A pressure testing assembly is provided on the test bench for performing strength tests on the shut-off valve. The pressure testing assembly includes a pressure block located on the top of the test bench. The first base is installed on both sides of the test bench; Guide cylinder, connected to the top of the first base; The guide slider is connected to the guide cylinder through the side near the test bench; the guide cylinder and the guide slider are in sliding fit. A pressure block replacement unit is mounted on a guide slider. The pressure block replacement unit is used to easily replace pressure blocks of different shapes. The pressure block replacement unit includes a limiting cylinder, which is installed on the side of the pressure block near the test bench. The limiting cylinder is connected through the guide slider on the side away from the test bench. The guide slider and the limiting cylinder are in sliding fit. The outer wall of the limiting cylinder is provided with several equally spaced limiting slots. The test bench is also equipped with a pressure-bearing and anti-impact mechanism; the pressure-bearing and anti-impact mechanism includes a third base, which is installed on the opposite surfaces of two semi-ring base blocks; An energy-absorbing sliding column is connected through the third base to the side near the top of the test bench; the energy-absorbing sliding column is slidably fitted with the third base; a pressure-bearing square plate is connected to the end of the energy-absorbing sliding column away from the test bench; the pressure-bearing square plate is located below the shut-off valve; the side of the shut-off valve near the top of the test bench is located on the moving path of the pressure-bearing square plate; an energy-absorbing limiting plate is connected to the end of the energy-absorbing sliding column near the test bench. An energy-absorbing spring is sleeved on an energy-absorbing sliding column; one end of the energy-absorbing spring is fixedly connected to the third base, and the other end is fixedly connected to the energy-absorbing limiting plate. A retaining seat is mounted on the guide slider; A fixed pulley is connected to the first base; A winding roller is located at the bottom of the test bench; a rotating shaft is connected to the winding roller. The fifth base is connected to the bottom of the test bench; the rotating shaft is connected to the fifth base; a spring is installed on the rotating shaft; the end of the spring is fixedly connected to the fifth base; One end of the cable is connected to the fixed seat, and the other end is wrapped around the winding roller after passing over the fixed pulley. A directional gear is connected to the end of the rotating shaft away from the fifth base; the directional gear and the directional rack are meshed together.

2. The pressure testing fixture for a shut-off valve according to claim 1, characterized in that: Includes a movable lead screw, installed on the back side of the two semi-ring base blocks; A drive source is mounted on a semi-ring base block; the output end of the drive source is connected to a position screw. The positioning block is threadedly connected to the positioning screw; The movable cylinder is mounted on the semi-ring base block; the movable block is connected to the movable cylinder through the side of the semi-ring base block; the movable cylinder and the movable block are in sliding fit.

3. The pressure testing fixture for a shut-off valve according to claim 2, characterized in that: Includes a braking circular block, connected to a positioning block; The brake cylinder is connected through the brake block to the side of the flange near the end of the shut-off valve; the brake block and the brake cylinder are in sliding fit. Brake limit plate, connected to the end of brake cylinder away from flange; Brake clamp, connected to the end of the brake cylinder near the flange; The flange is located on the movement path of the brake clamp; A brake spring is sleeved on a brake cylinder; one end of the brake spring is fixedly connected to a brake limiting plate, and the other end is fixedly connected to a brake block; a brake lever is also installed on the brake block; the screw hole on the flange is located on the movement path of the brake lever; a brake pin is also installed on the side of the brake clamp away from the brake cylinder; the medium flow hole on the flange is located on the movement path of the brake pin; the medium flow hole and the brake pin are fitted together.

4. The pressure testing fixture for a shut-off valve according to claim 1, characterized in that: Includes a telescopic cylinder, installed on the top of the test bench; A U-shaped connecting plate is attached to the output end of the telescopic cylinder; both ends of the U-shaped connecting plate are connected to two guide sliders.

5. The pressure testing fixture for a shut-off valve according to claim 1, characterized in that: It includes a positioning cylinder that runs through and connects to the guide slider on the side near the test bench; the positioning cylinder and the guide slider are in sliding engagement. A positioning horizontal plate is installed at the end of the positioning cylinder near the test bench. A positioning spring is sleeved on a positioning cylinder; one end of the positioning spring is fixedly connected to a guide slider, and the other end is fixedly connected to a positioning horizontal plate; the side of the positioning horizontal plate away from the top of the test bench is located on the moving path of the limiting cylinder near the top of the test bench.

6. The pressure testing fixture for a shut-off valve according to claim 1, characterized in that: Includes a second base, installed on both sides of the guide slider; A limiting slide rod is connected through the side of the second base; the second base and the limiting slide rod are slidably engaged; one end of the limiting slide rod is connected to a limiting circular plate, and the other end is connected to a limiting horizontal plate; the limiting horizontal plate is located on the side of the limiting slot. A limiting spring is sleeved on a limiting slide rod; one end of the limiting spring is fixedly connected to a limiting circular plate, and the other end is fixedly connected to a second base. The limiting block is installed on the side of the limiting plate near the limiting slot; when the limiting cylinder reaches the designated position, the limiting block passes through the side of the guide slider and connects with one of the limiting slots.

7. The pressure testing fixture for a shut-off valve according to claim 1, characterized in that: Includes a directional cylinder mounted on an energy-absorbing limiting plate; one end of the directional cylinder, away from the energy-absorbing limiting plate, extends through to the bottom of the test bench; the directional cylinder is slidably fitted with the test bench; A directional sliding plate is located at the bottom of the test bench; the side of the directional sliding plate near the bottom of the test bench is connected to a directional cylinder. The directional cylinder and the directional sliding plate slide together. A directional spring is sleeved on a directional cylinder; one end of the directional spring is fixedly connected to the bottom of the test bench, and the other end is fixedly connected to a directional sliding plate; an extension block is installed on the directional sliding plate; a directional rack is connected to the extension block; A slide rail is installed on the directional rack; a fourth base is installed at the bottom of the test bench; the slide rail is fitted into the fourth base, and the two slide together.

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