Strength detection device for valve shell

Abstract

The invention discloses a strength detection device for a valve shell, and relates to the technical field of valve shell strength detection.The strength detection device comprises a base, a hydraulic cylinder is vertically installed at the top of a mounting frame in a penetrating mode, a connecting base is installed at the bottom of a pressing base, a protective lower shell is arranged at the top of a moving base, and a driving assembly is arranged in the protective lower shell; a bearing pipe seat is vertically and movably arranged in the circular opening, and a reverse jacking mechanism used for secondary pressurization of the interior of the valve shell is arranged at the bottom end of the bearing pipe seat. A longitudinal moving mechanism is arranged in the rectangular opening; through cooperation of the lifting seat, the reverse jacking mechanism and the downward pressing seat, water pressure testing operation during sealing of the valve shell is facilitated, the accuracy of strength testing of the valve shell can be effectively improved, secondary pressure application can be performed on a water body in the valve shell, and when liquid transmits pressure in the valve shell, the valve shell can be conveniently subjected to water pressure testing operation. The pressure borne by all points in the valve shell is equal, and the safety and reliability of the overall structural strength of the valve shell are guaranteed.

Description

Technical Field

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

[0002] When producing valves, it is necessary to test the strength of the valve housing, mainly to ensure that the valve can withstand the pressure and stress under normal working conditions, and to prevent the valve housing from rupture or deformation during operation, thereby affecting the normal operation and safety of the valve; but due to the complex operation of the valve housing water pressure test: the traditional method is cumbersome and inefficient when conducting a water pressure test on the valve housing, and it is difficult to ensure the accuracy of the test; and the existing test methods are often unable to apply secondary pressure to the inside of the valve housing, resulting in uneven pressure at various points inside the valve housing during the test, affecting the accuracy of the test results; there is a lack of effective means to ensure the overall structural strength, safety and reliability of the valve housing during the water pressure test, and there are potential safety hazards; at the same time, when the valve housing is subjected to a water pressure test, water splashing is likely to occur, which not only affects the test environment, but may also pose a safety threat to the testers, and there is a lack of effective protective measures; therefore, the above problems need to be solved. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a strength detection device for a valve housing.

[0004] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a strength detection device for a valve housing, comprising a base, a mounting frame is installed on the top of the base, a hydraulic cylinder is installed vertically through the top of the mounting frame, a lower pressure seat is installed at the bottom of the telescopic end of the hydraulic cylinder, and a connecting seat for connecting the liquid inlet of the valve housing is installed at the bottom of the lower pressure seat, a movable seat is slidably provided on the top surface of the base, a protective lower shell is provided on the top of the movable seat, a lifting seat is horizontally movable inside the protective lower shell, a driving component for lifting the lifting seat is provided inside the protective lower shell, a circular opening is opened in the middle of the lifting seat, a supporting tube seat is vertically movable inside the circular opening, and a reverse top mechanism for secondary pressurization inside the valve housing is provided at the bottom of the supporting tube seat; a rectangular opening is longitudinally opened on the top surface of the base, and a longitudinal movement mechanism for driving the movable seat is provided in the rectangular opening; a protective upper shell cooperating with the protective lower shell is installed on the telescopic end of the hydraulic cylinder, and a liquid injection valve pipe is fixedly connected to one side of the lower pressure seat.

[0005] Preferably, a lower magnetic frame is provided on the top frame opening of the protective lower shell, an upper magnetic frame is provided on the bottom frame opening of the protective upper shell, a magnetic ring is fixedly connected to the middle of the top end of the protective upper shell, and a rubidium magnetic ring cooperating with the magnetic ring is fixedly connected to the bottom of the fixed end of the hydraulic cylinder; a guide strip opening is provided on one side of the protective upper shell to vertically cooperate with the injection valve tube.

[0006] Preferably, observation ports are provided on the front and rear end surfaces of the protective lower shell and the protective upper shell, and transparent explosion-proof glass is installed in the observation ports; a buffer rubber ring is fixedly provided on the inner top surface of the protective upper shell, and the telescopic end of the hydraulic cylinder passes through the buffer rubber ring.

[0007] Preferably, the longitudinal movement mechanism includes a lead screw rotatably arranged inside the rectangular opening, a servo motor arranged inside the rear end of the base and a threaded seat sleeved on the lead screw, guide strip openings are longitudinally opened on both sides of the top surface of the base, a sliding seat is slidably arranged inside the guide strip opening, mounting grooves are opened on the top of the threaded seat and the sliding seat, connecting blocks are vertically movably arranged in the mounting grooves, the top of the connecting block is fixedly connected to the bottom of the moving seat, and the bottom surface of the connecting block is longitudinally equidistantly provided with multiple vertical return springs.

[0008] Preferably, the driving assembly includes a threaded rod vertically rotatably arranged on both sides of the inner bottom surface of the protective lower shell, a driving cavity opened on both sides of the bottom of the protective lower shell, and a self-locking motor installed inside the driving cavity for driving the threaded rod. Threaded tubes are vertically penetrated by the threaded rods on both sides of the top of the lifting seat, and the threaded tubes are sleeved on the threaded rods. Guide rods are vertically movably penetrated at the four corners of the bottom surface of the lifting seat, and the bottom end of the guide rod is fixedly connected to the inner bottom surface of the protective lower shell.

[0009] Preferably, a supporting spring for supporting the lifting seat is movably sleeved on the guide rod below the lifting seat, the lower rod body of the threaded rod is in a bare rod shape, and the height of the supporting spring is lower than the height of the bottom end of the threaded section of the threaded rod.

[0010] Preferably, an electric push cylinder is vertically provided on the inner bottom surface of the protective lower shell inside the four guide rods, and a lifting plate for lifting the lifting seat is installed on the top of the telescopic end of the electric push cylinder. By starting the electric push cylinder, the lifting plate is driven to abut against the bottom of the lifting seat, the lifting seat is lifted, and the threaded pipe that has been detached from the threaded section on the threaded rod is re-screwed and connected.

[0011] Preferably, the anti-top mechanism includes an anti-top plug column movably and sealingly arranged in the lower part of the bearing tube seat, an inverted cone-shaped abutment block is provided in the middle of the bottom surface of the anti-top plug column, the bottom of the lifting seat is fixedly connected with an abutment seat with a notch facing upward, the top of the abutment seat is fixedly connected with stabilizing rods all around, a buffer ring is rotatably sleeved on the lower part of the outer wall of the bearing tube seat, the outer wall circumference of the buffer ring is fixedly connected with a stabilizing sleeve movably sleeved on the stabilizing rod, a buffer spring is movably sleeved on the stabilizing rod below the stabilizing sleeve, and the bottom end of the abutment block is movably abutted against the top surface of the abutment seat.

[0012] Preferably, a flange ring is fixedly connected to the top of the bearing tube seat, and a buffer space is spaced between the bottom of the flange ring and the top of the lifting seat, a plurality of anti-rotation plates are equidistantly provided on the circumferential side of the circular opening of the lifting seat, a plurality of damping strips are fixedly connected to the top surface of the anti-rotation plates, and a plurality of anti-slip grooves are equidistantly provided on the bottom of the flange ring; a multi-ring rotating ring plate is installed in the top opening of the bearing tube seat, a rubber drop bucket is installed in the middle of the inner circle of the rotating ring plate, and a plurality of liquid holes are equidistantly provided on the top surface of the rotating ring plate.

[0013] Preferably, the bottom opening of the lower pressure seat is connected to the top of the connecting seat, a downward convex inner rubber ring is installed in the lower opening of the connecting seat, and a sealing flange for connecting to the valve housing to be tested is provided at the bottom of the connecting seat.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention facilitates the water pressure test operation when the valve housing is closed through the cooperation of the lifting seat with the anti-top mechanism and the lower pressure seat, and can effectively improve the accuracy of the strength test of the valve housing, and can perform secondary pressure on the water inside the valve housing, so that when the liquid transmits pressure in the valve housing, the pressure at each point inside the valve housing is equal, and then the test results are used to judge whether the overall strength and sealing performance of the pipeline or container are qualified; water pressure testing can be effectively carried out to ensure the safety and reliability of the overall structural strength of the valve housing; through the automatic merging of the protective upper shell and the protective lower shell, it is convenient to form an overall protective structure to avoid water splashing when the valve housing is subjected to water pressure testing; and through the cooperation of the magnetic attraction ring on the protective upper shell and the rubidium magnetic ring at the bottom of the fixed end of the hydraulic cylinder, it is convenient to magnetically suspend the protective upper shell when it is not in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of another viewing angle of the overall structure of the present invention; Figure 3 It is a schematic diagram of the structure of the protective lower shell, the base and the movable seat of the present invention; Figure 4 It is a schematic diagram of the protective lower shell and the internal structure of the present invention; Figure 5 It is a schematic diagram of the structure of the protective upper shell, the magnetic attraction ring and the rubidium magnetic ring of the present invention; Figure 6 This is a schematic diagram of the bottom structure of the connecting base of the present invention; Figure 7 It is a schematic diagram of the internal structure of the protective lower shell of the present invention; Figure 8 It is a schematic structural diagram of the positional relationship between the sliding seat and the connecting block of the present invention; Fig. 9 It is a schematic diagram of the structure of the bearing support and the rotating ring plate of the present invention; Fig.10 It is a schematic diagram of the structure of the rotating ring plate and the falling glue bucket of the present invention; Fig.11 It is a schematic diagram of the anti-lifting mechanism and the supporting base structure of the present invention; Fig.12 It is a schematic diagram of the structure of the reverse top plug column and the abutment block of the present invention; Fig.13 It is a cross-sectional view of the bearing stem and the reverse top plug structure of the present invention.

[0016] Serial numbers in the figure: 1. base; 2. mounting frame; 3. hydraulic cylinder; 4. lower pressure seat; 5. connecting seat; 6. moving seat; 7. protective lower shell; 8. lead screw; 9. threaded seat; 10. servo motor; 11. protective upper shell; 12. magnetic attraction ring; 13. nebium magnetic ring; 14. upper magnetic frame; 15. lower magnetic frame; 16. lifting seat; 17. guide rod; 18. threaded rod; 19. self-locking motor; 20. supporting tube seat; 21. rotating ring plate; 22. anti-rotation plate; 23. supporting spring; 24. buffer ring; 25. abutment seat; 26. stabilizing rod; 27. buffer spring; 28. falling rubber bucket; 29. ​​anti-top plug; 30. abutment block; 31. sliding seat; 32. connecting block; 33. return spring; 34. electric push cylinder; 35. lifting plate; 36. injection valve tube; 37. inner rubber ring. DETAILED DESCRIPTION

[0017] 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.

[0018] Example 1: See Figures 1 to 13A strength detection device for a valve housing comprises a base 1, a mounting frame 2 is installed on the top of the base 1, a hydraulic cylinder 3 is installed vertically through the top of the mounting frame 2, a lower pressure seat 4 is installed at the bottom of the telescopic end of the hydraulic cylinder 3, a connecting seat 5 for connecting the liquid inlet of the valve housing is installed at the bottom of the lower pressure seat 4, a moving seat 6 is slidably provided on the top surface of the base 1, a protective lower shell 7 is provided on the top of the moving seat 6, a lifting seat 16 is horizontally movable inside the protective lower shell 7, a driving component for lifting the lifting seat 16 is provided inside the protective lower shell 7, a circular opening is opened in the middle of the lifting seat 16, a supporting tube seat 20 is vertically movable inside the circular opening, and a reverse top mechanism for secondary pressurization inside the valve housing is provided at the bottom end of the supporting tube seat 20; a rectangular opening is opened longitudinally on the top surface of the base 1, and a A longitudinal movement mechanism driven by the movable seat 6; a protective upper shell 11 cooperating with the protective lower shell 7 is installed on the telescopic end of the hydraulic cylinder 3, one side of the lower pressure seat 4 is fixedly connected to a liquid injection valve tube 36, and the other side of the outer wall of the lower pressure seat 4 is provided with an electronic exhaust valve tube; through the cooperation of the lifting seat 16 with the anti-top mechanism and the lower pressure seat 4, it is convenient to perform a water pressure test operation on the valve housing when it is closed, and can effectively improve the accuracy of the strength test of the valve housing, and can perform a secondary pressurization on the water body inside the valve housing, so that when the liquid transmits pressure in the valve housing, the pressure at each point inside the valve housing is equal, and then the test results are used to judge whether the overall strength and sealing performance of the pipeline or container are qualified; the water pressure test can be effectively carried out to ensure the safety and reliability of the overall structural strength of the valve housing.

[0019] In the present invention, a lower magnetic frame 15 is provided on the top frame opening of the protective lower shell 7, an upper magnetic frame 14 is provided on the bottom frame opening of the protective upper shell 11, a magnetic ring 12 is fixedly connected to the middle of the top of the protective upper shell 11, and a rubidium magnetic ring 13 matching the magnetic ring 12 is fixedly connected to the bottom of the fixed end of the hydraulic cylinder 3; a guide strip opening is provided on one side of the protective upper shell 11 to vertically match the injection valve tube 36; observation ports are provided on the front and rear end surfaces of the protective lower shell 7 and the protective upper shell 11, and transparent explosion-proof glass is installed in the observation ports; a buffer rubber ring is fixedly provided on the inner top surface of the protective upper shell 11, and the telescopic end of the hydraulic cylinder 3 is connected from the buffer The rubber ring passes through; the bottom opening of the lower pressure seat 4 is connected to the top of the connecting seat 5, and a downward convex inner plug-in rubber ring 37 is installed in the lower opening of the connecting seat 5. The bottom of the connecting seat 5 is provided with a sealing flange for connecting to the valve housing to be tested; through the automatic merging of the protective upper shell 11 and the protective lower shell 7, it is convenient to form an overall protective structure to avoid water splashing when the valve housing is subjected to a water pressure test; and through the cooperation of the magnetic attraction ring 12 on the protective upper shell 11 and the rubidium magnetic ring 13 at the bottom of the fixed end of the hydraulic cylinder 3, it is convenient to magnetically suspend the protective upper shell 11 when it is not in use.

[0020] Embodiment 2: The technical solution is basically the same as that of Embodiment 1, except that Figures 7 to 10As shown, the longitudinal movement mechanism includes a lead screw 8 rotatably arranged inside the rectangular opening, a servo motor 10 arranged inside the rear end of the base 1 and a threaded seat 9 sleeved on the lead screw 8. Guide strip openings are longitudinally opened on both sides of the top surface of the base 1, and a sliding seat 31 is slidably arranged inside the guide strip opening. The tops of the threaded seat 9 and the sliding seat 31 are opened with mounting grooves, and connecting blocks 32 are vertically movably arranged in the mounting grooves. The top of the connecting block 32 is fixedly connected to the bottom of the moving seat 6, and the bottom surface of the connecting block 32 is longitudinally equidistantly provided with a plurality of vertical return springs 33; the longitudinal movement mechanism is convenient for driving the moving seat 6 to move back and forth on the top of the base 1, which is convenient for the operator to operate The valve housing is disassembled and assembled; the driving assembly includes a threaded rod 18 that is vertically rotatable and arranged on both sides of the inner bottom surface of the protective lower shell 7, a driving cavity opened on both sides of the bottom of the protective lower shell 7 and a self-locking motor 19 installed in the driving cavity for driving the threaded rod 18. Threaded tubes are vertically penetrated by the threaded rod 18 on both sides of the top of the lifting seat 16, and the threaded tubes are sleeved on the threaded rod 18. Guide rods 17 are vertically movably penetrated at the four corners of the bottom surface of the lifting seat 16. The bottom end of the guide rod 17 is fixedly connected to the inner bottom surface of the protective lower shell 7. Through the setting of the driving assembly, the lifting seat 16 can be lifted and lowered, which is convenient for storing and protecting the valve housing.

[0021] In the present invention, a supporting spring 23 for supporting the lifting seat 16 is movably sleeved on the guide rod 17 below the lifting seat 16, the lower rod body of the threaded rod 18 is a bare rod, and the height of the supporting spring 23 is lower than the height of the bottom end of the threaded section of the threaded rod 18; an electric push cylinder 34 is vertically provided on the inner bottom surface of the protective lower shell 7 on the inner side of the four guide rods 17, and a lifting plate 35 for lifting the lifting seat 16 is installed on the top of the telescopic end of the electric push cylinder 34. By starting the electric push cylinder 34, the lifting plate 35 is driven to abut against the bottom of the lifting seat 16, so that the lifting seat 16 is lifted, and the threaded pipe that has been detached from the threaded section on the threaded rod 18 is re-screwed and connected.

[0022] Embodiment 3: The technical solution is basically the same as that of Embodiment 1, except that Figure 6 , Figures 9 to 13As shown, the anti-top mechanism includes an anti-top plug column 29 movably and sealably arranged in the lower part of the bearing tube seat 20, an inverted cone-shaped abutment block 30 is provided in the middle of the bottom surface of the anti-top plug column 29, an abutment seat 25 with a notch facing upward is fixedly connected to the bottom of the lifting seat 16, and stabilizing rods 26 are fixedly connected to the top of the abutment seat 25 on all sides, a buffer ring 24 is rotatably sleeved on the lower part of the outer wall of the bearing tube seat 20, and a stabilizing sleeve movably sleeved on the stabilizing rod 26 is fixedly connected to the outer wall side of the buffer ring 24, and a buffer spring 27 is movably sleeved on the stabilizing rod 26 below the stabilizing sleeve, and the bottom end of the abutment block 30 is movably abutted against the top surface of the abutment seat 25; a flange ring is fixedly connected to the top of the bearing tube seat 20, and a buffer space is spaced between the bottom of the flange ring and the top of the lifting seat 16. A plurality of anti-rotation plates 22 are equidistantly arranged around the circular opening of the lowering seat 16, a plurality of damping strips are fixedly connected to the top surface of the anti-rotation plates 22, and a plurality of anti-slip grooves are equidistantly arranged at the bottom of the flange ring; when the supporting tube seat 20 is pressed down, the flange ring at its upper end can abut against the top of the anti-rotation plate 22 to prevent the supporting tube seat 20 from rotating horizontally in the circular opening; a multi-ring rotating ring plate 21 is installed in the top opening of the supporting tube seat 20, a falling rubber bucket 28 is installed in the middle of the inner circle of the rotating ring plate 21, and a plurality of liquid holes are equidistantly arranged on the top surface of the rotating ring plate 21, and the plurality of liquid holes can be selectively sealed by sealing plugs, leaving only local liquid holes for circulating water, thereby improving the effect of the anti-top plug column 29 in promoting water pressurization.

[0023] Working principle: In this embodiment, the present invention also proposes a method for using a strength detection device for a valve housing, comprising the following steps: Step 1: First, electrically connect each electrical device in the device with the external control device, then start the electric push cylinder 34 to drive the lifting plate 35 to abut against the bottom of the lifting seat 16, lift the lifting seat 16, and re-screw and connect the threaded pipe that has been separated from the threaded section on the threaded rod 18, and then start the self-locking motor 19 to drive the threaded rod 18 to rotate forward, so that the lifting seat 16 can be lifted from the protective lower shell 7 through the forward rotating threaded rod 18; then the top surface of the lifting seat 16 is lifted out of the top of the protective lower shell 7, and then the valve housing to be strength tested is installed on the top of the supporting tube 20 on the lifting seat 16, so that the liquid outlet port of the valve housing is sealed and connected with the supporting tube 20; Step 2, then start the hydraulic cylinder 3 to drive the lower pressure seat 4 to initially descend, at this time, connect the injection valve pipe 36 on the lower pressure seat 4 with the external pressurized liquid feeding equipment, then fix the connecting seat 5 at the bottom of the lower pressure seat 4 with the water inlet of the valve housing to be tested, and then start the driving assembly to drive the lifting seat 16 to fall back, and make the threaded pipe on the lifting seat 16 disengage from the threaded end of the threaded rod 18, so as to avoid the situation where the threaded rod 18 bears weight during the downward pressure test; and in the process of the lifting seat 16 falling back, the hydraulic cylinder 3 at this time also synchronously brings the lower pressure seat 4 to descend synchronously, so that the valve housing part to be tested can fall into the protective lower shell 7; Step three, at the same time, before the lower pressure seat 4 descends, the magnetic ring 12 is separated from the rubidium magnetic ring 13, and when the lower pressure seat 4 descends, the distance between the protective upper shell 11 and the protective lower shell 7 is shortened, so that the protective upper shell 11 can be stably magnetically attracted to the lower magnetic frame 15 on the protective lower shell 7 through the upper magnetic frame 14, and then the protective upper shell 11 and the protective lower shell 7 are automatically merged to form an integral protective structure, so as to avoid water splashing when the valve housing is subjected to a water pressure test; Step 4: When conducting a closed water pressure test on the valve housing strength, the external pressurized liquid supply device supplies liquid to the lower pressure seat 4, and then the water enters the tested valve housing through the connecting seat 5. The air inside the valve housing is discharged by opening the exhaust manifold. It is necessary to ensure that the air in the pipeline is completely discharged to avoid air hammer or water hammer. When water is observed to flow out of the exhaust valve pipe, the exhaust valve is slowly closed to ensure that there is no residual air in the pipeline. Then, a pressurized test is performed, and then the external pressurized liquid injection device raises the pressure to three times the normal water pressure (such as about 1.0MPA) and maintains it for a period of time (such as half an hour to three hours). Then, the water pressure of the valve housing is tested. The test is carried out in accordance with the provisions of API, HI and ANSI, or with a liquid of at least 1.5 times the maximum allowable working pressure. The test ensures that the valve housing can withstand the maximum working pressure of the pump to prevent rupture during operation. Observe the pressure change: Check the change of the pressure gauge pointer at the same time. If the change is small, it means that the pipeline is normal; if the change is large, there may be leakage and other problems; and observe whether the pressure is maintained: when the design pressure value is reached, keep the constant pressure for a period of time (such as one hour) to check whether there are any leaks or abnormalities in the various parts and joints of the valve housing; thus, the overall pressure-bearing strength of the valve housing can be determined; Step five, in order to further increase the pressure acting on the inside of the valve housing, the hydraulic cylinder 3 is started to drive the pressure seat 4 to press down the tested valve housing. The lowering of the valve housing can make the bottom end of the supporting stem 20 move toward the abutment seat 25, and then the anti-top plug column 29 moves toward the internal seal of the supporting stem 20, thereby applying secondary pressure to the water body inside the valve housing, so that when the liquid transmits pressure in the valve housing, the pressure at each point is equal. The overall strength and sealing performance of the pipeline or container are judged according to the test results. Through the above steps, the water pressure test can be effectively carried out to ensure the safety and reliability of the overall structural strength of the valve housing.

[0024] Step six, after completing the strength test of the valve housing, start the reset of each mechanism, and then remove the valve housing that has completed the test.

[0025] 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 strength detection device for a valve housing, comprising a base (1), characterized in that: A mounting frame (2) is installed on the top of the base (1), a hydraulic cylinder (3) is installed vertically through the top of the mounting frame (2), a lower pressure seat (4) is installed at the bottom of the telescopic end of the hydraulic cylinder (3), a connecting seat (5) for connecting to the liquid inlet of the valve housing is installed at the bottom of the lower pressure seat (4), a moving seat (6) is slidably provided on the top surface of the base (1), a protective lower shell (7) is provided on the top of the moving seat (6), a lifting seat (16) is horizontally movable inside the protective lower shell (7), a driving component for lifting the lifting seat (16) is provided inside the protective lower shell (7), a circular opening is opened in the middle of the lifting seat (16), a supporting tube seat (20) is vertically movable inside the circular opening, and a reverse top mechanism for secondary pressurization inside the valve housing is provided at the bottom of the supporting tube seat (20); A rectangular opening is longitudinally provided on the top surface of the base (1), and a longitudinal movement mechanism for driving the movable seat (6) is provided in the rectangular opening; a protective upper shell (11) cooperating with a protective lower shell (7) is installed on the telescopic end of the hydraulic cylinder (3), and a liquid injection valve pipe (36) is fixedly connected to one side of the lower pressure seat (4).

2. A strength detection device for a valve housing according to claim 1, characterized in that: A lower magnetic frame (15) is provided on the top frame opening of the protective lower shell (7), an upper magnetic frame (14) is provided on the bottom frame opening of the protective upper shell (11), a magnetic ring (12) is fixedly connected to the middle of the top end of the protective upper shell (11), and a rubidium magnetic ring (13) matching the magnetic ring (12) is fixedly connected to the bottom of the fixed end of the hydraulic cylinder (3); a guide strip opening is provided on one side of the protective upper shell (11) to vertically match the injection valve tube (36).

3. A strength detection device for a valve housing according to claim 2, characterized in that: Observation ports are provided on the front and rear end surfaces of the protective lower shell (7) and the protective upper shell (11), and transparent explosion-proof glass is installed in the observation ports; a buffer rubber ring is fixedly provided on the inner top surface of the protective upper shell (11), and the telescopic end of the hydraulic cylinder (3) passes through the buffer rubber ring.

4. A strength detection device for a valve housing according to claim 1, characterized in that: The longitudinal movement mechanism comprises a lead screw (8) rotatably arranged inside the rectangular opening, a servo motor (10) arranged inside the rear end of the base (1), and a threaded seat (9) sleeved on the lead screw (8), guide strip openings are longitudinally provided on both sides of the top surface of the base (1), a sliding seat (31) is slidably provided inside the guide strip opening, mounting slots are provided on the tops of the threaded seat (9) and the sliding seat (31), and connecting blocks (32) are vertically movably provided in the mounting slots, the top of the connecting block (32) is fixedly connected to the bottom of the movable seat (6), and a plurality of vertical return springs (33) are longitudinally equidistantly provided on the bottom surface of the connecting block (32).

5. A strength detection device for a valve housing according to claim 1, characterized in that: The driving assembly comprises a threaded rod (18) vertically rotatably arranged on both sides of the inner bottom surface of the protective lower shell (7), a driving cavity opened on both sides of the bottom of the protective lower shell (7), and a self-locking motor (19) installed in the driving cavity for driving the threaded rod (18). Both sides of the top of the lifting seat (16) are vertically matched with the threaded rod (18) and penetrated by a threaded tube, and the threaded tube is sleeved on the threaded rod (18). The four corners of the bottom surface of the lifting seat (16) are vertically movably penetrated by a guide rod (17), and the bottom end of the guide rod (17) is fixedly connected to the inner bottom surface of the protective lower shell (7).

6. A strength detection device for a valve housing according to claim 5, characterized in that: A support spring (23) for supporting the lifting seat (16) is movably sleeved on the guide rod (17) below the lifting seat (16); the lower rod body of the threaded rod (18) is in the shape of a bare rod; and the height of the support spring (23) is lower than the height of the bottom end of the threaded section of the threaded rod (18).

7. A strength detection device for a valve housing according to claim 6, characterized in that: An electric push cylinder (34) is vertically provided on the inner bottom surface of the protective lower shell (7) inside the four guide rods (17), and a lifting plate (35) for lifting the lifting seat (16) is installed on the top of the telescopic end of the electric push cylinder (34). By starting the electric push cylinder (34), the lifting plate (35) is driven to abut against the bottom of the lifting seat (16), so that the lifting seat (16) is lifted, and the threaded pipe that has been detached from the threaded section on the threaded rod (18) is screwed back and connected.

8. A strength detection device for a valve housing according to claim 1, characterized in that: The anti-lift mechanism comprises an anti-lift plug column (29) movably and sealably arranged in the lower part of the bearing tube seat (20); an inverted cone-shaped abutment block (30) is arranged in the middle of the bottom surface of the anti-lift plug column (29); an abutment seat (25) with a notch facing upward is fixedly connected to the bottom of the lifting seat (16); a stabilizing rod (26) is fixedly connected to the top of the abutment seat (25); a buffer ring (24) is rotatably sleeved on the lower part of the outer wall of the bearing tube seat (20); a stabilizing sleeve movably sleeved on the stabilizing rod (26) is fixedly connected to the outer wall side of the buffer ring (24); a buffer spring (27) is movably sleeved on the stabilizing rod (26) below the stabilizing sleeve; and the bottom end of the abutment block (30) movably abuts against the top surface of the abutment seat (25).

9. A strength detection device for a valve housing according to claim 8, characterized in that: A flange ring is fixedly connected to the top of the bearing tube seat (20), and a buffer space is spaced between the bottom of the flange ring and the top of the lifting seat (16); a plurality of anti-rotation plates (22) are equidistantly provided on the circular opening circumference of the lifting seat (16); a plurality of damping strips are fixedly connected to the top surface of the anti-rotation plates (22); and a plurality of anti-slip grooves are equidistantly provided on the bottom of the flange ring; a multi-ring rotating ring plate (21) is installed in the top opening of the bearing tube seat (20); a rubber drop bucket (28) is installed in the middle of the inner ring of the rotating ring plate (21); and a plurality of liquid holes are equidistantly provided on the top surface of the rotating ring plate (21).

10. A strength detection device for a valve housing according to claim 2, characterized in that: The bottom opening of the lower pressure seat (4) is communicated with the top of the connecting seat (5), a downward convex inner rubber ring (37) is installed in the lower opening of the connecting seat (5), and a sealing flange for connecting to the housing of the valve to be tested is provided at the bottom of the connecting seat (5).

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