A strength testing device for valve steel castings

Abstract

The present invention discloses a valve steel casting strength testing device, including a workbench, first movable grooves are provided on both sides of the upper surface of the workbench, a first threaded rod is rotatably connected inside the first movable groove, a first pressing structure is threadedly sleeved on the surface of the first threaded rod, two second movable grooves are provided on the upper surface of the workbench, support rods are fixedly connected on both sides of the upper surface of the workbench, a mounting platform is fixedly connected on the upper surface of the support rod, a sealing structure is fixedly connected to the middle end of the upper surface of the mounting platform, and a detection structure is fixedly connected to both sides of the upper surface of the mounting platform. The present invention provides a pressing structure, a sealing structure and a detection structure, so that the device can perform pressing strength detection on both ends and the surface of the valve casting respectively, and can test the sealing inside the valve casting, and can also perform tensile strength detection on the valve casting after the pressing strength detection, so that the detection range is more comprehensive.

Description

Technical Field

[0001] The invention relates to the technical field of valve detection equipment, and in particular to a valve casting strength detection equipment. Background Art

[0002] After the production of valve steel castings is completed, they need to be tested for strength before they can be put into use. The current strength testing method for valve steel castings is to fix the valve castings and gradually increase the pressure applied to the valve castings to observe the deformation of the valve castings.

[0003] The patent with publication number CN215179126U and its name is a valve casting strength detection equipment, which discloses a valve casting strength detection equipment, including a fixed base, a support frame, a fixed clamping plate, a sliding clamping plate, a servo motor, a horizontal clamping mechanism and a vertical clamping mechanism, wherein the upper end of the fixed base is fixedly connected to a support frame, a fixed clamping plate is fixedly connected inside the support frame and located below the support frame, a sliding clamping plate is slidably connected inside the support frame and above the fixed clamping plate, the servo motor is fixedly connected between the fixed base and the fixed clamping plate and is located in the middle position of the fixed clamping plate. The beneficial effect of the present invention is that through the rotation of the fixed rotating shaft, the horizontal clamping block of the horizontal clamping mechanism can be driven to move toward the adjacent side to horizontally clamp the valve casting, and at the same time, the vertical clamping block of the vertical clamping mechanism can be driven to move toward the adjacent side to vertically clamp the valve casting. This patented technology has shortcomings in its actual application. The device clamps and pressurizes the valve casting and then observes its shape change to determine whether the strength is qualified. However, the device can only pressurize the valve casting and cannot perform tensile strength tests. The parts where pressure can be applied are limited. After the pressurization is completed, the strength can only be determined by observing the deformation. The sealing of the valve casting after pressurization cannot be tested, and the detection effect is limited. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to provide a valve casting strength testing device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A valve steel casting strength testing device comprises a workbench, wherein first movable grooves are provided on both sides of the upper surface of the workbench, a first threaded rod is rotatably connected inside the first movable groove, a first pressing structure is threadedly sleeved on the surface of the first threaded rod, two second movable grooves are provided on the upper surface of the workbench, a second threaded rod is rotatably connected inside the second movable groove, a second pressing structure is threadedly sleeved on the surface of the second threaded rod, a placement seat is fixedly connected to the middle end of the upper surface of the workbench, two lower positioning rings are fixedly connected to the upper surface of the placement seat, valve castings are arranged inside the two lower positioning rings, support rods are fixedly connected to both sides of the upper surface of the workbench, the upper surface of the support rods is fixedly connected to a mounting platform, a sealing structure is fixedly connected to the middle end of the upper surface of the mounting platform, and a detection structure is fixedly connected to both sides of the upper surface of the mounting platform, and the first movable groove and the second movable groove are arranged perpendicular to each other.

[0007] As a further improvement of the present invention, the first pressing structure includes two first movable seats threadedly sleeved on the surface of the first threaded rod, the upper surfaces of the two first movable seats are fixedly connected to the first fixed rod, a fixed seat is fixedly connected between the two first fixed rods, the front side of the fixed seat is fixedly connected to a pressure rod, the front side of the pressure rod is fixedly connected to a first sleeve, the front side of the first sleeve is fixedly connected to a pressure seat, and both sides of the pressure seat are fixedly connected to elastic clamping parts.

[0008] As a further improvement of the present invention, the second pressing structure includes two second movable seats threadedly sleeved on the surface of the second threaded rod, the upper surfaces of the two second movable seats are fixedly connected to the same second fixed rod, one side of the second fixed rod is fixedly connected to two pressure springs, one side of the pressure spring is fixedly connected to a second sleeve, one side of the second sleeve is fixedly connected to a pressure ring, several sliding grooves are provided on the upper surface of the workbench, and the lower surfaces of the pressure seat and the second sleeve are fixedly connected to sliding rods matching the sliding grooves.

[0009] As a further improvement of the present invention, the sealing structure includes a cylinder fixedly connected to the middle end of the upper surface of the mounting platform, the telescopic end of the cylinder is fixedly connected to a connecting plate, both sides of the lower surface of the connecting plate are fixedly connected to upper positioning rings, the midpoint of the lower surface of the connecting plate is fixedly connected to a sealing spring, the lower surface of the sealing spring is fixedly connected to a sealing plate, one side of the upper positioning ring is fixedly connected to a bottom rod, the interior of the bottom rod is movably connected to a movable rod, one end of the movable rod is fixedly connected to a limiting ring, and both sides of the limiting ring are fixedly connected to slot parts that are compatible with the elastic clamping plate parts.

[0010] As a further improvement of the present invention, the detection structure includes a gas reaction box fixedly connected to one side of the upper surface of the mounting platform and a heating seat fixedly connected to the other side of the upper surface of the mounting platform, a water storage tank is inserted into the upper surface of the heating seat, a telescopic air bag is fixedly connected to the upper surface of the water storage tank, a chain rod is fixedly connected to the upper surface of the telescopic air bag, the other end of the chain rod is fixedly connected to the connecting plate, a slot is provided on the upper surface of the mounting platform, the chain rod is movably connected to the inside of the slot, two water pipes are fixedly connected to the surface of the water storage tank, the other ends of the two water pipes are fixedly connected to the gas reaction box, one side of the gas reaction box is fixedly connected to an air inlet pipe, the other end of the air inlet pipe is fixedly connected to one side of the upper surface of a sealing plate, and a box cover is fixedly installed on the upper surface of the gas reaction box.

[0011] As a further improvement of the present invention, both ends of the surface of the first threaded rod are fixedly connected with a first bevel gear, both ends of the second threaded rod are fixedly connected with a second bevel gear, the first bevel gear and the second bevel gear are meshed with each other, an installation groove is opened on the front side of the workbench, a power bidirectional motor is fixedly connected inside the installation groove, and the power end of the power bidirectional motor is fixedly connected to the first threaded rod.

[0012] As a further improvement of the present invention, an air storage box is fixedly connected to one side of the workbench, a negative pressure machine is fixedly connected to one side of the air storage box, an air outlet pipe is fixedly connected to the upper surface of the air storage box, the other end of the air outlet pipe is fixedly connected to the other side of the upper surface of the sealing plate, and an air outlet is fixedly connected to the front of the air storage box.

[0013] As a further improvement of the present invention, a water inlet is fixedly connected to the upper surface of the water storage tank, and a base is fixedly connected to the lower surface of the workbench, and the number of the bases is two.

[0014] Beneficial effects of the present invention:

[0015] By setting up the sealing structure, when in use, after disassembling the valve, the valve casting is placed on the lower positioning ring on the placement seat, and the cylinder is started to drive the upper positioning ring to move downward through the connecting plate until the upper positioning ring fixes the valve casting, and at the same time the sealing spring and the sealing plate close the upper pipe opening of the valve casting, so that the device can easily fix and limit the valve casting, avoid the position of the valve casting being offset during the strength test, and increase the accuracy of the test.

[0016] By setting the first pressing structure, when in use, the power bidirectional motor is started to drive the first threaded rod to rotate, and the first threaded rod drives the second threaded rod to rotate synchronously through the first bevel gear and the second bevel gear, thereby driving the two first threaded rods and the two second threaded rods above the workbench to rotate synchronously, and the two first threaded rods are driven to move toward each other through the rotation of the two first threaded rods, so that the two ends of the valve casting are tested for pressing strength, and at the same time, the elastic card plate parts on both sides of the pressure seat are inserted into the card groove parts on both sides of the limit ring, and the elastic card plate parts and the card groove parts complete the card connection to fix the pressure seat and the limit ring together, and after the pressing test is completed, the power bidirectional motor is started to rotate in the opposite direction to drive the two first fixed rods to move in the opposite direction, and the valve casting is tested for tensile strength through the pressure seat and the limit ring, so that the device can perform pressing and tensile strength tests on the valve casting, and the test is more comprehensive.

[0017] By setting up the second pressing structure, when in use, the power bidirectional motor is started to drive the second threaded rod to rotate synchronously through the first bevel gear and the second bevel gear, and the two second fixed rods are driven to move toward each other through the synchronous rotation of the two second threaded rods, and the side of the valve casting is pressed through the pressure ring. The pressure spring can avoid errors during pressing, so that the device can press on the surface of the valve casting while pressing on both ends, thereby increasing the detection range.

[0018] By setting up the detection structure, when in use, the starting cylinder drives the upper positioning ring to move downward through the connecting plate, and at the same time drives the chain rod to move in the slot, thereby pressing the telescopic airbag. The pressing of the telescopic airbag will input the hot water in the water storage tank into the gas reaction box through the water pipe to react with the dry ice to generate white smoke-like gaseous dry ice. The white smoke enters the valve casting under the sealing plate through the air inlet pipe. If there is a problem with the sealing of the valve casting, white smoke will leak, so that the device can detect the sealing of the valve casting after the strength test of the valve casting, thereby increasing the detection effect.

[0019] By setting up an air storage box and a negative pressure machine, when in use, the negative pressure machine is started to suck the white smoke inside the valve casting into the air storage box through the outlet pipe, so as to avoid a large amount of white smoke inside the valve casting after the valve casting is unsealed, so that the device can collect the white smoke of gaseous dry ice used for detection, avoid the gaseous dry ice from causing damage to the staff, and increase the safety of the device.

[0020] The present invention provides a first pressing structure, a second pressing structure, a sealing structure and a detection structure, so that the device can perform pressing strength detection on both ends and the surface of the valve casting respectively, and can test the sealing inside the valve casting. After the pressing strength detection, the valve casting can also be subjected to tensile strength detection. The detection range is wider and more comprehensive, thereby increasing the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of a valve steel casting strength testing device proposed by the present invention;

[0022] Figure 2 A schematic diagram of the structure of a first pressing structure of a valve steel casting strength detection device proposed by the present invention;

[0023] Figure 3 A schematic diagram of the structure of a second pressing structure of a valve steel casting strength testing device proposed by the present invention;

[0024] Figure 4 A structural schematic diagram of a sealing structure of a valve steel casting strength testing device proposed by the present invention;

[0025] Figure 5 A schematic diagram of the structure of a detection structure of a valve steel casting strength detection device proposed by the present invention;

[0026] Figure 6 A schematic diagram of the structure of a workbench of a valve steel casting strength testing device proposed by the present invention;

[0027] Figure 7 The present invention provides a schematic diagram of the top view of a valve steel casting strength testing device.

[0028] In the figure: 1 workbench, 2 first movable groove, 3 first threaded rod, 4 second movable groove, 5 second threaded rod, 6 placement seat, 7 lower positioning ring, 8 valve casting, 9 support rod, 10 mounting table, 11 first movable seat, 12 first fixed rod, 13 fixed seat, 14 pressure rod, 15 first sleeve, 16 pressure seat, 17 elastic clamping plate, 18 second movable seat, 19 second fixed rod, 20 pressure spring, 21 second sleeve, 22 pressure ring, 23 cylinder, 24 connecting plate, 25 upper positioning ring, 26 sealing spring, 27 sealing plate, 28 bottom rod, 29 movable rod, 30 limiting ring, 31 slot part, 32 gas reaction box, 33 heating seat, 34 water storage tank, 35 telescopic airbag, 36 linkage rod, 37 water pipe, 38 air inlet pipe, 39 box cover, 40 first bevel gear, 41 second bevel gear, 42 mounting groove, 43 power bidirectional motor, 44 air storage box, 45 negative pressure machine, 46 air outlet pipe, 47 air outlet, 48 water inlet, 49 base, 50 slide groove, 51 slide rod, 52 slot. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] Reference Figure 1-Figure 7A valve steel casting strength testing device comprises a workbench 1, wherein first movable grooves 2 are provided on both sides of the upper surface of the workbench 1, a first threaded rod 3 is rotatably connected inside the first movable groove 2, a first pressing structure is threadedly sleeved on the surface of the first threaded rod 3, two second movable grooves 4 are provided on the upper surface of the workbench 1, a second threaded rod 5 is rotatably connected inside the second movable groove 4, a second pressing structure is threadedly sleeved on the surface of the second threaded rod 5, a placement seat 6 is fixedly connected to the middle end of the upper surface of the workbench 1, two lower positioning rings 7 are fixedly connected to the upper surface of the placement seat 6, a valve casting 8 is arranged inside the two lower positioning rings 7, support rods 9 are fixedly connected to both sides of the upper surface of the workbench 1, a mounting platform 10 is fixedly connected to the upper surface of the support rod 9, a sealing structure is fixedly connected to the middle end of the upper surface of the mounting platform 10, and a detection structure is fixedly connected to both sides of the upper surface of the mounting platform 10, and the first movable groove 2 and the second movable groove 4 are arranged perpendicular to each other.

[0031] In the present invention, the first pressing structure includes two first movable seats 11 threadedly sleeved on the surface of the first threaded rod 3, the upper surfaces of the two first movable seats 11 are fixedly connected with the first fixed rods 12, a fixed seat 13 is fixedly connected between the two first fixed rods 12, the front of the fixed seat 13 is fixedly connected with the pressure rod 14, the front of the pressure rod 14 is fixedly connected with the first sleeve 15, the front of the first sleeve 15 is fixedly connected with the pressure seat 16, the pressure strength of the two ends of the valve casting 8 is tested by the pressure seat 16, and the two ends are sealed at the same time, and the two sides of the pressure seat 16 are fixedly connected with elastic clamping plate members 17;

[0032] The second pressing structure includes two second moving seats 18 threadedly sleeved on the surface of the second threaded rod 5, the upper surfaces of the two second moving seats 18 are fixedly connected with the same second fixed rod 19, one side of the second fixed rod 19 is fixedly connected with two pressure springs 20, one side of the pressure spring 20 is fixedly connected with a second sleeve 21, the pressure spring 20 can avoid errors when the pressure seat 16 and the pressure ring 22 are pressed at the same time, one side of the second sleeve 21 is fixedly connected with the pressure ring 22, the upper surface of the workbench 1 is provided with a plurality of slide grooves 50, the lower surfaces of the pressure seat 16 and the second sleeve 21 are fixedly connected with slide rods 51 adapted to the slide grooves 50, and the slide rods 51 can ensure the stability of the pressure seat 16 and the second sleeve 21 when moving;

[0033] The sealing structure includes a cylinder 23 fixedly connected to the middle end of the upper surface of the mounting platform 10, the telescopic end of the cylinder 23 is fixedly connected to a connecting plate 24, both sides of the lower surface of the connecting plate 24 are fixedly connected to an upper positioning ring 25, the midpoint of the lower surface of the connecting plate 24 is fixedly connected to a sealing spring 26, the lower surface of the sealing spring 26 is fixedly connected to a sealing plate 27, the starting cylinder 23 drives the upper positioning ring 25 to move downward through the connecting plate 24, the sealing spring 26 and the sealing plate 27 close the upper pipe opening of the valve casting 8, one side of the upper positioning ring 25 is fixedly connected to a bottom rod 28, the bottom of the bottom rod 28 is movably connected to a movable rod 29, one end of the movable rod 29 is fixedly connected to a limit ring 30, both sides of the limit ring 30 are fixedly connected to a slot member 31 adapted to the elastic card plate member 17, the elastic card plate member 17 and the slot member 31 are mutually clamped to connect the limit ring 30 and the pressure seat 16 together, thereby fixing the two ends of the valve casting 8;

[0034] The detection structure includes a gas reaction box 32 fixedly connected to one side of the upper surface of the mounting platform 10 and a heating seat 33 fixedly connected to the other side of the upper surface of the mounting platform 10. A water tank 34 is plugged into the upper surface of the heating seat 33. The water source inside the water tank 34 is heated by the heating seat 33. The hot water can react with dry ice to produce thick white smoke. A telescopic airbag 35 is fixedly connected to the upper surface of the water tank 34. A chain rod 36 is fixedly connected to the upper surface of the telescopic airbag 35. The other end of the chain rod 36 is fixedly connected to the connecting plate 24. A slot 52 is opened on the upper surface of the mounting platform 10. The chain rod 36 is movably connected to the inside of the slot 52. Two water pipes 37 are fixedly connected to the surface of the water tank 34. The other ends of the two water pipes 37 are The cylinder 23 is fixedly connected to the gas reaction box 32. The cylinder 23 drives the upper positioning ring 25 to move downward through the connecting plate 24, and at the same time drives the linkage rod 36 to move in the slot 52, thereby pressing the telescopic airbag 35. The pressing of the telescopic airbag 35 will input the hot water in the water storage tank 34 into the gas reaction box 32 through the water pipe 37 to react with the dry ice. An air inlet pipe 38 is fixedly connected to one side of the gas reaction box 32. The other end of the air inlet pipe 38 is fixedly connected to one side of the upper surface of the sealing plate 27. The gaseous dry ice is input into the valve casting 8 through the air inlet pipe 38. A box cover 39 is fixedly installed on the upper surface of the gas reaction box 32. After adding a proper amount of dry ice into the gas reaction box 32, the box cover 39 is closed to prevent leakage after the dry ice is vaporized.

[0035] Both ends of the surface of the first threaded rod 3 are fixedly connected with the first bevel gear 40, and both ends of the second threaded rod 5 are fixedly connected with the second bevel gear 41. The first bevel gear 40 and the second bevel gear 41 are meshed with each other. A mounting groove 42 is provided on the front of the workbench 1. A power bidirectional motor 43 is fixedly connected inside the mounting groove 42. The power end of the power bidirectional motor 43 is fixedly connected to the first threaded rod 3. The power bidirectional motor 43 provides power for the strength detection of the device, and drives the first threaded rod 3 and the second threaded rod 5 to run synchronously through the setting of the first bevel gear 40 and the second bevel gear 41;

[0036] An air storage box 44 is fixedly connected to one side of the workbench 1, a negative pressure machine 45 is fixedly connected to one side of the air storage box 44, an air outlet pipe 46 is fixedly connected to the upper surface of the air storage box 44, the other end of the air outlet pipe 46 is fixedly connected to the other side of the upper surface of the sealing plate 27, the gaseous dry ice inside the valve casting 8 is sucked into the air storage box 44 through the air outlet pipe 46 through the negative pressure machine 45, an air outlet 47 is fixedly connected to the front of the air storage box 44, the gas is discharged through the air outlet 47, a water inlet 48 is fixedly connected to the upper surface of the water tank 34, water is added to the water tank 34 through the water inlet 48, a base 49 is fixedly connected to the lower surface of the workbench 1, and the number of the base 49 is two.

[0037] When the present invention is used, the valve of the valve casting 8 is first disassembled for subsequent testing. After disassembly, the valve casting 8 is placed on the lower positioning ring 7 on the placement seat 6, water is injected into the water storage tank 34 through the water inlet 48, the heating seat 33 is started to heat the water, and a proper amount of dry ice is added to the gas reaction box 32, and the box cover 39 is closed. The cylinder 23 is started to drive the upper positioning ring 25 to move downward through the connecting plate 24 until the upper positioning ring 25 fixes the valve casting 8 to prevent the valve casting 8 from shifting during the strength test. At the same time, the sealing spring 26 and the sealing plate 27 seal the upper pipe opening of the valve casting 8.

[0038] Secondly, the power bidirectional motor 43 is started to drive the first threaded rod 3 to rotate, and the first threaded rod 3 drives the second threaded rod 5 to rotate synchronously through the first bevel gear 40 and the second bevel gear 41, thereby driving the two first threaded rods 3 and the two second threaded rods 5 above the workbench 1 to rotate synchronously, and the two first fixed rods 12 are driven to move toward each other through the rotation of the two first threaded rods 3 until the two pressure seats 16 contact the two pipe openings of the valve casting 8, and the pressing strength of the two ends of the valve casting 8 is tested. When the pressure seat 16 presses the valve casting 8, the pipe opening will be sealed, and at the same time, the two The second threaded rod 5 rotates synchronously to drive the two second fixed rods 19 to move toward each other, and the side of the valve casting 8 is pressed and tested through the pressure ring 22. The pressure spring 20 can avoid errors during pressing, and the deformation of the surface of the valve casting 8 is observed. Since the limit ring 30 and the slot member 31 are limited by the pressure ring 22, the elastic clamping plate members 17 on both sides of the pressure seat 16 will be inserted into the slot members 31 on both sides of the limit ring 30. The elastic clamping plate member 17 and the slot member 31 complete the clamping connection, thereby fixing the pressure seat 16 and the limit ring 30 together, which is convenient for subsequent tensile testing;

[0039] Then, the cylinder 23 drives the upper positioning ring 25 to move downward through the connecting plate 24, and at the same time drives the linkage rod 36 to move in the slot 52, thereby pressing the telescopic airbag 35. The pressing of the telescopic airbag 35 will input the hot water in the water storage tank 34 into the gas reaction box 32 through the water pipe 37 to react with the dry ice to generate thick white smoke-like gaseous dry ice. The white smoke enters the valve casting 8 below the sealing plate 27 through the air inlet pipe 38. At this time, the three pipe openings of the valve casting 8 are all in a closed state. Since the gaseous dry ice has a lower density than air, the white smoke will squeeze the air inside the valve casting 8 out of the air outlet pipe 46. If there is a problem with the sealing of the valve casting 8, white smoke will leak.

[0040] Finally, after waiting for the sealing test to be completed, start the negative pressure machine 45 to suck the white smoke inside the valve casting 8 into the air storage box 44 through the outlet pipe 46, so as to prevent the white smoke inside the valve casting 8 from leaking in large quantities after the valve casting 8 is unsealed. After the absorption is completed, start the power bidirectional motor 43 to rotate in the opposite direction to drive the two first fixed rods 12 to move in the opposite direction. The limit ring 30 can change its position through the movable rod 29, so as to perform the tensile strength test on the valve casting 8 through the pressure seat 16 and the limit ring 30. After the test is completed, press the elastic card plate 17 to remove it from the card slot 31, so as to separate the pressure seat 16 and the limit ring 30, start the starting cylinder 23 to drive the upper positioning ring 25 to move upward, and then remove the valve casting 8 that has been tested.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A valve steel casting strength testing device, comprising a workbench (1), characterized in that: The upper surface of the workbench (1) is provided with first movable grooves (2) on both sides, the first movable groove (2) is rotatably connected to a first threaded rod (3), the surface of the first threaded rod (3) is threadedly sleeved with a first pressing structure, the upper surface of the workbench (1) is provided with two second movable grooves (4), the second movable groove (4) is rotatably connected to a second threaded rod (5), the surface of the second threaded rod (5) is threadedly sleeved with a second pressing structure, the middle end of the upper surface of the workbench (1) is fixedly connected to a placement seat (6), the upper surface of the placement seat (6) is fixedly connected to two lower positioning rings (7), the two lower positioning rings (7) are provided with valve castings (8), the upper surface of the workbench (1) is fixedly connected to support rods (9) on both sides, the upper surface of the support rods (9) is fixedly connected to a mounting platform (10), the middle end of the upper surface of the mounting platform (10) is fixedly connected to a sealing structure, the upper surface of the mounting platform (10) is fixedly connected to detection structures on both sides, and the first movable groove (2) and the second movable groove (4) are arranged perpendicular to each other; The first pressing structure comprises two first movable seats (11) threadedly sleeved on the surface of the first threaded rod (3), the upper surfaces of the two first movable seats (11) are fixedly connected to the first fixed rod (12), a fixed seat (13) is fixedly connected between the two first fixed rods (12), the front side of the fixed seat (13) is fixedly connected to the pressure rod (14), the front side of the pressure rod (14) is fixedly connected to the first sleeve (15), the front side of the first sleeve (15) is fixedly connected to the pressure seat (16), and both sides of the pressure seat (16) are fixedly connected to elastic clamping plate members (17); The sealing structure comprises a cylinder (23) fixedly connected to the middle end of the upper surface of the mounting platform (10), the telescopic end of the cylinder (23) being fixedly connected to a connecting plate (24), both sides of the lower surface of the connecting plate (24) being fixedly connected to upper positioning rings (25), the midpoint of the lower surface of the connecting plate (24) being fixedly connected to a sealing spring (26), the lower surface of the sealing spring (26) being fixedly connected to a sealing plate (27), one side of the upper positioning ring (25) being fixedly connected to a bottom rod (28), the interior of the bottom rod (28) being movably connected to a movable rod (29), one end of the movable rod (29) being fixedly connected to a limiting ring (30), and both sides of the limiting ring (30) being fixedly connected to slot components (31) adapted to the elastic clamp component (17); The detection structure comprises a gas reaction box (32) fixedly connected to one side of the upper surface of the mounting platform (10) and a heating seat (33) fixedly connected to the other side of the upper surface of the mounting platform (10); a water storage tank (34) is plugged into the upper surface of the heating seat (33); a telescopic air bag (35) is fixedly connected to the upper surface of the water storage tank (34); a linkage rod (36) is fixedly connected to the upper surface of the telescopic air bag (35); the other end of the linkage rod (36) is fixedly connected to the connecting plate (24); the upper surface of the mounting platform (10) is connected to the upper surface of the heating seat (33); A slot (52) is provided on the surface, the linkage rod (36) is movably connected to the inside of the slot (52), two water pipes (37) are fixedly connected to the surface of the water storage tank (34), the other ends of the two water pipes (37) are fixedly connected to the gas reaction box (32), one side of the gas reaction box (32) is fixedly connected to an air inlet pipe (38), the other end of the air inlet pipe (38) is fixedly connected to one side of the upper surface of the sealing plate (27), and a box cover (39) is fixedly installed on the upper surface of the gas reaction box (32); An air storage box (44) is fixedly connected to one side of the workbench (1), a negative pressure machine (45) is fixedly connected to one side of the air storage box (44), an air outlet pipe (46) is fixedly connected to the upper surface of the air storage box (44), the other end of the air outlet pipe (46) is fixedly connected to the other side of the upper surface of the sealing plate (27), and an air outlet (47) is fixedly connected to the front of the air storage box (44).

2. A valve steel casting strength testing device according to claim 1, characterized in that: The second pressing structure comprises two second movable seats (18) threadedly sleeved on the surface of the second threaded rod (5); the upper surfaces of the two second movable seats (18) are fixedly connected to the same second fixed rod (19); one side of the second fixed rod (19) is fixedly connected to two pressure springs (20); one side of the pressure spring (20) is fixedly connected to a second sleeve (21); one side of the second sleeve (21) is fixedly connected to a pressure ring (22); the upper surface of the workbench (1) is provided with a plurality of slide grooves (50); the lower surfaces of the pressure seat (16) and the second sleeve (21) are fixedly connected to slide rods (51) adapted to the slide grooves (50).

3. A valve casting strength testing device according to claim 1, characterized in that: Both ends of the surface of the first threaded rod (3) are fixedly connected to a first bevel gear (40), and both ends of the second threaded rod (5) are fixedly connected to a second bevel gear (41), the first bevel gear (40) and the second bevel gear (41) are meshed, and a mounting groove (42) is provided on the front of the workbench (1), a power bidirectional motor (43) is fixedly connected inside the mounting groove (42), and a power end of the power bidirectional motor (43) is fixedly connected to the first threaded rod (3).

4. A valve casting strength testing device according to claim 1, characterized in that: The upper surface of the water storage tank (34) is fixedly connected to a water inlet (48), and the lower surface of the workbench (1) is fixedly connected to a base (49), and the number of the bases (49) is two.

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