Pump shell compression detection device and detection method

Abstract

The present application relates to the technical field of pump shell material strength test, and discloses a pump shell compression resistance detection device and a detection method, which comprises a pipe base, the outer wall of the top end of the pipe base extends outward to form a ring disc, a plurality of guide grooves are arranged at the top end of the ring disc, a sliding block is slidably arranged in the guide groove through a guide rail, a pressing block is arranged at the top end of the sliding block, and an arc pressing piece is arranged at the output end of the pressing block; a micro deformation detection mechanism is arranged between the pressing block and the arc pressing piece and is used for detecting the micro deformation of the outer surface of the pump shell; a reset mechanism is used for automatically resetting the sliding block after the pump shell compression resistance detection is completed; and a traction mechanism converts the axial driving force along the pipe base into radial traction of the ring disc. The present application realizes synchronous radial pressure on the outer surface of the pump shell at multiple points, realizes synchronous radial loading and real-time dynamic monitoring of the micro deformation of the outer surface of the pump shell during the compression resistance loading process, and improves the accuracy of the compression resistance detection.

Description

Technical Field

[0001] This invention relates to the field of pump casing material strength testing technology, specifically to a pump casing compressive strength testing device and testing method. Background Technology

[0002] The slurry pump is a cantilevered, single-stage, single-suction centrifugal pump specifically designed and developed for conveying corrosive media containing fine particles. This pump is made of steel-lined ultra-high molecular weight polyethylene (UHMWPE), the latest generation of corrosion-resistant and wear-resistant engineering plastics for pumps. UHMWPE possesses superior wear resistance, impact resistance, creep resistance, and excellent corrosion resistance among all plastics. The slurry pump combines both corrosion resistance and wear resistance, making it suitable for a wide range of applications.

[0003] Chinese patent (CN213148595U) discloses a vacuum pump housing pressure resistance testing device, comprising: a base, two support columns fixedly arranged on both sides above the base, and a support cross plate fixedly arranged on the top of the support columns; a pressing structure, the pressing structure being located above the support cross plate, the pressing structure including a hydraulic cylinder, a fixed plate, a support block, a pressing plate and a pressure sensor, and the hydraulic cylinder being fixedly arranged on the top of the support cross plate.

[0004] However, the aforementioned technologies have some drawbacks, such as: 1. Single-point or dual-point pressure application creates detection blind spots. Traditional testing devices often employ single-point or dual-point pressure application, which is insufficient to cover all circumferential areas of the pump casing, easily resulting in detection blind spots. However, during actual operation, the outer surface of a mortar pump casing is subjected to radial enveloping pressure generated by the external medium. Existing single-point pressure application methods cannot realistically simulate this circumferentially uniform pressure condition, leading to discrepancies between test results and actual service performance.

[0005] 2. Limited Deformation Detection Methods: Existing testing methods primarily focus on the overall pressure-bearing capacity of the pump casing, lacking real-time monitoring of minute deformations in localized areas during testing. When localized stress concentrations or early micro-damage occur in the pump casing, conventional testing methods cannot detect them in time, often only after significant deformation or cracking, hindering early quality control of the pump casing.

[0006] 3. The testing conditions are out of sync with the actual working environment, resulting in insufficient reference value of the test data: In actual use, the pump casing is usually in a working environment with a certain temperature. Temperature changes affect the mechanical properties and deformation characteristics of the material. Most existing testing devices perform tests at room temperature, which cannot simulate the compressive strength of the pump casing at actual working temperatures, leading to deviations between the test data and actual working conditions. Summary of the Invention

[0007] To address the aforementioned problems in the prior art, this invention provides a pump casing pressure testing device and method, which can solve the problems mentioned in the background art.

[0008] This invention proposes a pump casing pressure resistance testing device, comprising: The tube seat has an outer wall at the top end extending outward to form an annular disk. The top end of the annular disk is provided with multiple guide grooves, which are arranged in a circumferential array. A slider is slidably disposed in the guide groove via a guide rail. A pressure block is provided at the top end of the slider, and an arc pressing element is provided at the output end of the pressure block. The micro-deformation detection mechanism is located between the pressure block and the arc-pressure component to detect micro-deformation on the outer surface of the pump casing. The reset mechanism is used to drive the slider to automatically reset after the pump casing pressure test is completed; The traction mechanism converts the axial driving force along the tube seat into a radial traction force of the ring disc; The temperature control component is located inside the tube socket; The drive mechanism is used to provide tension to the traction mechanism.

[0009] Preferably, the cross-section of the pressure block is L-shaped, and the end of the arc pressing member away from the pressure block is provided with a shaped groove.

[0010] Preferably, the micro-deformation detection mechanism includes a connecting rod, a circular plate, and a first displacement sensor. The connecting rod is slidably installed between the pressure block and the arc-shaped component. The circular plate is fixedly sleeved with the connecting rod. A limiting plate is detachably installed in the irregular groove of the arc-shaped component by fasteners. The limiting plate is slidably connected to the connecting rod. A compression spring is provided between the limiting plate and the circular plate. The first displacement sensor is installed in the irregular groove of the arc-shaped component to detect changes in the position of the connecting rod.

[0011] Preferably, the reset mechanism includes a plate base and a vertical plate. The plate base is disposed at the bottom end of the ring disk, and the vertical plate is disposed at the bottom end of the slider. Two reset springs are disposed between the plate base and the vertical plate. Two guide rods are disposed on the side of the plate base near the vertical plate. The reset springs and the adjacent guide rods are coaxially disposed. A second displacement sensor is disposed on the side of the plate base near the vertical plate for detecting changes in the distance between the plate base and the vertical plate.

[0012] Preferably, the traction mechanism includes a lifting seat and a ring seat. The ring seat is disposed on the inner wall of the tube seat. The inner wall of the ring seat is provided with a plurality of first fixed pulleys. The number of the plurality of first fixed pulleys is the same as the number of sliders and is distributed in a circumferential array. The bottom end of the ring plate is provided with a plurality of second fixed pulleys. The side of the plate seat away from the vertical plate is provided with a third fixed pulley. A plurality of steel wire ropes are disposed between the lifting seat and the vertical plate and are sequentially wound between the first fixed pulleys, second fixed pulleys and third fixed pulleys on the path. The top end of the ring seat is provided with a plurality of clearance grooves that match the steel wire ropes.

[0013] Preferably, the outer wall of the lifting seat is provided with multiple support rings, and the support rings are fixedly connected to one end of the wire rope by fasteners.

[0014] Preferably, the temperature control component includes: an annular box, a fan, and an electric heating wire disposed inside the annular box. The top of the annular box is provided with multiple air outlets. Two partitions are sealed and fixed at intervals along the axial direction on the outer side of the annular box to form an air supply cavity. The inner wall of the cavity of the annular box is provided with multiple square holes that communicate with the air supply cavity. The fan is disposed through the bottom end of the partition located below.

[0015] Preferably, the drive mechanism includes a support seat and an integrated hydraulic cylinder disposed on the support seat. The support seat is disposed on the inner wall of the tube seat, and the output end of the integrated hydraulic cylinder is detachably connected to the lifting seat by fasteners.

[0016] The present invention also proposes a method for testing the pressure resistance of a pump casing, comprising the following steps: S1. Initial positioning: Place the pump housing to be tested on the top of the ring disk, so that the surface of the pump housing to be tested is opposite to each arc-shaped component. Each slider is in the initial position under the action of the return spring. The abutment rod extends out of the surface of the arc-shaped component and abuts against the outer surface of the pump housing. At this time, the first displacement sensor records the initial displacement value and the second displacement sensor records the initial spacing value. S2, Anti-compression loading: Start the integrated hydraulic cylinder to drive the lifting seat to move downward along the tube seat axis. The lifting seat pulls each vertical plate and slider to move radially synchronously along the guide groove towards the center of the tube seat through the steel wire rope, driving the pressure block and arc pressure component to apply radial pressure to the outer surface of the pump casing. S3. Dynamic Deformation Monitoring and Early Damage Warning: During the compressive loading process, the first displacement sensor detects the displacement change of the abutment rod in real time, and the second displacement sensor detects the distance change between the plate seat and the vertical plate in real time. The external control system synchronously collects the tension value output by the hydraulic cylinder and the two sets of displacement data and establishes a dynamic deformation curve. When the displacement change rate of the abutment rod changes abruptly or fluctuates abnormally locally, it indicates that there is early damage in the stress concentration area on the outer surface of the pump casing. When the distance change between the plate seat and the vertical plate deviates from the synchronous change trend, it indicates that the corresponding slider movement is obstructed or the load distribution is uneven. Based on the cross-comparison of the two sets of data, the external control system promptly identifies and locates the stress concentration area and early damage location on the outer surface of the pump casing and issues an early warning signal. S4. Reset and Data Recording: After the pressure test is completed, the integrated hydraulic cylinder is depressurized, the lifting seat is reset, and the reset spring pushes the slider and the vertical plate to slide along the guide groove away from the center of the tube seat to reset.

[0017] Preferably, in step S2, when the drive lifting seat moves downward along the tube seat axial direction, the wire rope is guided by the first fixed pulley, the second fixed pulley and the third fixed pulley in sequence, converting the axial tension of the lifting seat into the synchronous radial traction force of each slider, so that multiple arc pressure components move synchronously towards the center of the tube seat, and apply uniform radial pressure to the outer surface of the pump casing.

[0018] The beneficial effects of this invention are as follows: 1. By setting up a micro-deformation detection mechanism consisting of a contact rod, a circular plate, a compression spring, and a first displacement sensor, and a traction mechanism consisting of a lifting seat, a support ring, a ring seat, a first fixed pulley, a second fixed pulley, and a third fixed pulley, and cooperating with the second displacement sensor of the reset mechanism, the contact rod is in close contact with the outer surface of the pump casing. When the lifting seat moves axially, the wire rope is guided by each fixed pulley to convert the axial tension into the synchronous radial traction force of each slider. Multiple arc pressure components apply radial pressure synchronously. The first displacement sensor detects the displacement change of the contact rod in real time, and the second displacement sensor detects the distance change between the plate seat and the vertical plate in real time. The external control system synchronously collects the tension value output by the hydraulic cylinder and the two sets of displacement data and establishes a dynamic deformation curve. The two sets of data are cross-compared. The technical effects achieved are as follows: synchronous radial loading and real-time dynamic monitoring of micro-deformation on the outer surface of the pump casing during the compressive loading process are realized. The loading force is uniform and highly synchronous. Sudden changes in displacement rate or local abnormal fluctuations can promptly reflect early damage in stress concentration areas. Cross-comparison of two sets of displacement data can effectively identify anomalies caused by obstructed slider movement or uneven load distribution, accurately locate stress concentration areas and early damage locations, avoid the limitations of single sensor detection, and provide reliable data support for accurate evaluation of pump casing compressive performance.

[0019] 2. By setting a temperature control component consisting of a ring box, a fan, an electric heating wire and partitions, the top of the ring box is provided with multiple air outlets, and two partitions are sealed and fixed along the outer side at intervals along the axial direction to form an air supply chamber. The inner wall of the chamber is provided with multiple square holes that communicate with the air supply chamber. The fan heats the outside air through the electric heating wire and sends it into the air supply chamber. After entering the ring box through the square holes, the air is blown out evenly from the air outlets. The technical effect achieved is that it simulates the temperature conditions of the pump casing in the actual working environment, enabling the pressure test to be carried out in a controllable simulated temperature environment, avoiding the impact of ambient temperature fluctuations on the deformation test accuracy, and ensuring the correlation and accuracy of the test data with the actual operating conditions.

[0020] 3. By setting multiple guide grooves distributed in a circular array along the circumference of the ring disk and corresponding sliders, pressure blocks and arc pressure components, the traction mechanism drives each slider to move radially towards the center of the pipe seat synchronously along the guide groove, so that multiple arc pressure components apply radial pressure synchronously from multiple points on the outer surface of the pump casing. The technical effects achieved are: synchronous radial pressure at multiple points on the outer surface of the pump casing, which truly simulates the radial enveloping pressure condition experienced by the outer surface of the pump casing during actual operation of the mortar pump. The multiple points cover the circumferential test area of ​​the pump casing, avoiding the detection blind zone and deviation of the working condition caused by single-point pressure, and improving the accuracy and practical reference value of the pressure test. Attached Figure Description

[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a diagram showing the installation structure of the tube seat and ring disc in this invention; Figure 3 This is a sectional perspective view of the tube seat in this invention; Figure 4 This is an installation structure diagram of the traction mechanism in this invention; Figure 5 This is a structural diagram of the installation of the pressure block, the arc pressing component, and the abutment rod in this invention; Figure 6 This is an installation structure diagram of the micro-deformation detection mechanism in this invention; Figure 7 This is a diagram showing the installation structure of the ring seat and the first fixed pulley in this invention; Figure 8 This is a cross-sectional perspective view of the temperature control component in this invention.

[0023] Explanation of reference numerals in the attached figures: 1. Tube seat; 2. Ring disc; 3. Guide groove; 4. Slider; 5. Pressure block; 6. Arc-pressed component; 11. Abutment rod; 12. Circular disc; 13. Limiting plate; 14. Compression spring; 15. First displacement sensor; 21. Plate base; 22. Vertical plate; 23. Guide rod; 24. Return spring; 25. Second displacement sensor; 31. Lifting seat; 311. Support ring; 32. Ring seat; 321. Clearance groove; 33. First fixed pulley; 34. Second fixed pulley; 35. Third fixed pulley; 41. Ring-shaped box; 42. Air outlet; 43. Baffle; 44. Square hole; 45. Fan; 46. Electric heating wire; 51. Bearing seat; 52. Integrated hydraulic cylinder. Detailed Implementation

[0024] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the specific implementation methods, structures, features, and effects of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and preferred embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this application, it should be understood that the orientation or positional relationship indicated by terms such as "inner" and "outer" are based on the orientation or position shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or a specific orientational structure and operation, and therefore should not be construed as a limitation of this application.

[0026] Example 1: Reference Figures 1-8 The pump casing pressure testing device disclosed in this embodiment includes: To achieve both load-bearing capacity and radial positioning of the pump casing, in this embodiment: pipe seat 1, pipe... The outer wall of the top of the seat 1 extends outward to form an annular disk 2. The top of the annular disk 2 is provided with multiple guide grooves 3, which are arranged in a circular array. A slider 4 is slidably arranged in the guide groove 3 via a guide rail. A pressure block 5 is provided at the top of the slider 4. An arc pressing element 6 is provided at the output end of the pressure block 5. The cross-section of the pressure block 5 is L-shaped. An irregular groove is provided at the end of the arc pressing element 6 away from the pressure block 5.

[0027] To achieve real-time detection of micro-deformation on the outer surface of the pump casing, in this embodiment: a micro-deformation detection mechanism is disposed between the pressure block 5 and the arc-pressing component 6, used to detect micro-deformation on the outer surface of the pump casing. The micro-deformation detection mechanism includes an abutment rod 11, a disc 12, and a first displacement sensor 15. The abutment rod 11 is slidably installed between the pressure block 5 and the arc-pressing component 6. The disc 12 is fixedly sleeved with the abutment rod 11. A limit plate 13 is detachably disposed in the irregular groove of the arc-pressing component 6 by fasteners. The limit plate 13 is slidably connected to the abutment rod 11. A compression spring 14 is disposed between the limit plate 13 and the disc 12. The first displacement sensor 15 is disposed in the irregular groove of the arc-pressing component 6, used to detect the position change information of the abutment rod 11.

[0028] To achieve automatic reset of slider 4 after the test is completed, in this embodiment: a reset mechanism is used to drive slider 4 to automatically reset after the pump casing pressure test is completed. The reset mechanism includes a plate base 21 and a vertical plate 22. The plate base 21 is set at the bottom end of the ring disk 2, and the vertical plate 22 is set at the bottom end of slider 4. Two reset springs 24 are set between the plate base 21 and the vertical plate 22. Two guide rods 23 are set on the side of the plate base 21 near the vertical plate 22. The reset springs 24 and the adjacent guide rods 23 are coaxially arranged. A second displacement sensor 25 is set on the side of the plate base 21 near the vertical plate 22 to detect the change in the distance between the plate base 21 and the vertical plate 22.

[0029] To achieve the conversion of axial driving force to radial traction force, in this embodiment: the traction mechanism converts the axial driving force along the tube seat 1 into the radial traction force of the ring disc 2. The traction mechanism includes a lifting seat 31 and a ring seat 32. The outer wall of the lifting seat 31 is provided with multiple support rings 311. The support rings 311 are fixedly connected to one end of the wire rope by fasteners. The ring seat 32 is provided on the inner wall of the tube seat 1. The inner wall of the ring seat 32 is provided with multiple first fixed pulleys 33. The number of the multiple first fixed pulleys 33 is the same as the number of sliders 4 and they are distributed in a circumferential array. The bottom end of the ring disc 2 is provided with multiple second fixed pulleys 34. The side of the plate seat 21 away from the vertical plate 22 is provided with a third fixed pulley 35. Multiple wire ropes are provided between the lifting seat 31 and the vertical plate 22 and are sequentially wound between the first fixed pulleys 33, the second fixed pulleys 34 and the third fixed pulleys 35 on the path.

[0030] To achieve precise control of the ambient temperature, in this embodiment: a temperature control component is installed inside the tube seat 1. The temperature control component includes: an annular box 41, a fan 45, and an electric heating wire 46 installed inside the annular box 41. The top of the annular box 41 is provided with multiple air outlets 42. Two partitions 43 are sealed and fixed at intervals along the axial direction on the outer side of the annular box 41 to form an air supply cavity. The inner wall of the cavity of the annular box 41 is provided with multiple square holes 44 that communicate with the air supply cavity. The fan 45 is installed through the bottom end of the partition 43 located below.

[0031] To achieve power drive for the traction mechanism, in this embodiment: a drive mechanism is used to provide tension to the traction mechanism. The drive mechanism includes a support seat 51 and an integrated hydraulic cylinder 52 disposed on the support seat 51. The support seat 51 is disposed on the inner wall of the tube seat 1. The output end of the integrated hydraulic cylinder 52 is detachably connected to the lifting seat 31 through fasteners. The integrated hydraulic cylinder 52 integrates a force sensor, which is electrically connected to an external control system to detect the tension value output by the integrated hydraulic cylinder 52 in real time and transmit the tension signal to the external control system to monitor the magnitude and trend of the pressure applied to the outer surface of the pump casing by each arc pressure component 6 during the test. Combined with the displacement data of the first displacement sensor 15 and the second displacement sensor 25, the control system can synchronously obtain the correspondence between the loading force and the deformation response to form a dynamic "force-displacement" curve. When the correspondence between the loading force and the displacement change deviates abnormally, it indicates that the pump casing material may undergo nonlinear deformation or local yielding. The control system judges the compressive strength state of the pump casing accordingly, providing more comprehensive data support for the test results.

[0032] This embodiment also provides a method for testing the pump casing pressure resistance, which uses the aforementioned pump casing pressure resistance testing device and specifically includes the following steps: S1. Initial positioning: Place the pump housing to be tested on the top of the ring disk 2, so that the surface of the pump housing to be tested is opposite to each arc pressing component 6. Each slider 4 is in the initial position under the action of the return spring 24. The abutment rod 11 extends out of the surface of the arc pressing component 6 and abuts against the outer surface of the pump housing. At this time, the first displacement sensor 15 records the initial displacement value and the second displacement sensor 25 records the initial spacing value.

[0033] S2, Anti-compression loading: The integrated hydraulic cylinder 52 is activated, driving the lifting seat 31 to move downwards along the axial direction of the tube seat 1. The lifting seat 31 pulls each vertical plate 22 and slider 4 synchronously radially towards the center of the tube seat 1 via steel wire ropes. During this process, the steel wire ropes are guided sequentially by the first fixed pulley 33, the second fixed pulley 34, and the third fixed pulley 35, converting the axial tension of the lifting seat 31 into the synchronous radial traction force of each slider 4. This causes multiple arc-pressure components 6 to move synchronously towards the center of the tube seat 1, driving the pressure block 5 and the arc-pressure components 6 to apply uniform radial pressure to the outer surface of the pump casing.

[0034] S3. Dynamic Deformation Monitoring and Early Damage Warning: During the compressive loading process, the first displacement sensor 15 detects the displacement change of the abutment rod 11 in real time, and the second displacement sensor 25 detects the distance change between the plate seat 21 and the vertical plate 22 in real time. The external control system synchronously collects the tension value output by the hydraulic cylinder 52 and the two sets of displacement data, and establishes a dynamic deformation curve. When the displacement change rate of the abutment rod 11 changes abruptly or fluctuates abnormally locally, it indicates that there is early damage in the stress concentration area on the outer surface of the pump casing. When the distance change between the plate seat 21 and the vertical plate 22 deviates from the synchronous change trend, it indicates that the movement of the corresponding slider 4 is hindered or the load distribution is uneven. Based on the cross-comparison of the two sets of data, the external control system promptly identifies and locates the stress concentration area and early damage location on the outer surface of the pump casing, and issues an early warning signal.

[0035] S4. Reset and Data Recording: After the pressure test is completed, the integrated hydraulic cylinder 52 is depressurized, the lifting seat 31 is reset, and the reset spring 24 pushes the slider 4 and the vertical plate 22 to slide and reset along the guide groove 3 away from the center of the tube seat 1, in preparation for the next test.

[0036] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A pump casing pressure resistance testing device, characterized in that, include: The tube seat (1) has an outer wall extending outward to form an annular disk (2). The top of the annular disk (2) is provided with multiple guide grooves (3). The multiple guide grooves (3) are arranged in a circular array. A slider (4) is slidably arranged in the guide groove (3) through a guide rail. A pressure block (5) is provided at the top of the slider (4). An arc pressing element (6) is provided at the output end of the pressure block (5). The micro-deformation detection mechanism is located between the pressure block (5) and the arc pressure component (6) and is used to detect the micro-deformation of the outer surface of the pump casing; The reset mechanism is used to drive the slider (4) to automatically reset after the pump casing pressure test is completed; The traction mechanism converts the axial driving force along the tube seat (1) into the radial traction force of the ring disc (2); Temperature control components are installed inside the tube socket (1); The drive mechanism is used to provide tension to the traction mechanism.

2. The pump casing pressure testing device according to claim 1, characterized in that, The cross-section of the pressure block (5) is L-shaped, and the end of the arc pressing member (6) away from the pressure block (5) is provided with a shaped groove.

3. The pump casing pressure testing device according to claim 2, characterized in that, The micro-deformation detection mechanism includes a connecting rod (11), a disc (12), and a first displacement sensor (15). The connecting rod (11) is slidably installed between the pressure block (5) and the arc pressing component (6). The disc (12) is fixedly sleeved with the connecting rod (11). A limiting plate (13) is detachably installed in the irregular groove of the arc pressing component (6) by fasteners. The limiting plate (13) is slidably connected to the connecting rod (11). A compression spring (14) is provided between the limiting plate (13) and the disc (12). The first displacement sensor (15) is installed in the irregular groove of the arc pressing component (6) to detect the position change information of the connecting rod (11).

4. The pump casing pressure testing device according to claim 1, characterized in that, The reset mechanism includes a plate base (21) and a vertical plate (22). The plate base (21) is located at the bottom of the ring disk (2), and the vertical plate (22) is located at the bottom of the slider (4). Two reset springs (24) are provided between the plate base (21) and the vertical plate (22). Two guide rods (23) are provided on the side of the plate base (21) near the vertical plate (22). The reset springs (24) and the adjacent guide rods (23) are coaxially arranged. A second displacement sensor (25) is provided on the side of the plate base (21) near the vertical plate (22) to detect the change in the distance between the plate base (21) and the vertical plate (22).

5. The pump casing pressure testing device according to claim 4, characterized in that, The traction mechanism includes a lifting seat (31) and a ring seat (32). The ring seat (32) is located on the inner wall of the tube seat (1). The inner wall of the ring seat (32) is provided with a plurality of first fixed pulleys (33). The number of the plurality of first fixed pulleys (33) is the same as the number of sliders (4) and they are arranged in a circular array. The bottom end of the ring disc (2) is provided with a plurality of second fixed pulleys (34). The side of the plate seat (21) away from the vertical plate (22) is provided with a third fixed pulley (35). A plurality of steel wire ropes are provided between the lifting seat (31) and the vertical plate (22) and are wound sequentially between the first fixed pulleys (33), the second fixed pulleys (34) and the third fixed pulleys (35) on the path.

6. The pump casing pressure testing device according to claim 5, characterized in that, The outer wall of the lifting seat (31) is provided with multiple support rings (311), and the support rings (311) are fixedly connected to one end of the wire rope by fasteners.

7. The pump casing pressure testing device according to claim 1, characterized in that, The temperature control component includes: an annular box (41), a fan (45) and an electric heating wire (46) disposed in the annular box (41). The top of the annular box (41) is provided with multiple air outlets (42). Two partitions (43) are sealed and fixed at intervals along the axial direction on the outer side of the annular box (41) to form an air supply cavity. The inner wall of the cavity of the annular box (41) is provided with multiple square holes (44) that communicate with the air supply cavity. The fan (45) is disposed through the bottom of the partition (43) located below.

8. The pump casing pressure testing device according to claim 5, characterized in that, The drive mechanism includes a support seat (51) and an integrated hydraulic cylinder (52) disposed on the support seat (51). The support seat (51) is disposed on the inner wall of the tube seat (1). The output end of the integrated hydraulic cylinder (52) is detachably connected to the lifting seat (31) by fasteners.

9. A method for testing the pressure resistance of a pump casing, characterized in that, Includes the following steps: S1. Initial positioning: Place the pump housing to be tested on the top of the ring disk (2) so that the surface to be tested of the pump housing is opposite to each arc pressure component (6). Each slider (4) is in the initial position under the action of the reset spring (24). The abutment rod (11) extends out of the surface of the arc pressure component (6) and abuts against the outer surface of the pump housing. At this time, the first displacement sensor (15) records the initial displacement value and the second displacement sensor (25) records the initial spacing value. S2, Anti-compression loading: Start the integrated hydraulic cylinder (52) to drive the lifting seat (31) to move downward along the tube seat (1) axially. The lifting seat (31) pulls each vertical plate (22) and slider (4) along the guide groove (3) to move radially towards the center of the tube seat (1) synchronously, thereby driving the pressure block (5) and arc pressure component (6) to apply radial pressure to the outer surface of the pump casing. S3. Dynamic Deformation Monitoring and Early Damage Warning: During the compressive loading process, the first displacement sensor (15) detects the displacement change of the abutment rod (11) in real time, and the second displacement sensor (25) detects the distance change between the plate seat (21) and the vertical plate (22) in real time. The external control system synchronously collects the tensile force value output by the hydraulic cylinder (52) and the two sets of displacement data and establishes a dynamic deformation curve. When the displacement change rate of the abutment rod (11) changes abruptly or fluctuates abnormally locally, it indicates that there is early damage in the stress concentration area on the outer surface of the pump casing. When the distance change between the plate seat (21) and the vertical plate (22) deviates from the synchronous change trend, it indicates that the movement of the corresponding slider (4) is obstructed or the load distribution is uneven. The external control system identifies and locates the stress concentration area and early damage location on the outer surface of the pump casing in a timely manner based on the cross comparison of the two sets of data and issues an early warning signal. S4. Reset and Data Recording: After the pressure test is completed, the integrated hydraulic cylinder (52) is depressurized, the lifting seat (31) is reset, and the reset spring (24) pushes the slider (4) and the vertical plate (22) to slide and reset along the guide groove (3) away from the center of the tube seat (1).

10. The pump casing pressure resistance testing method according to claim 9, characterized in that, When the drive lifting seat (31) moves downward along the axial direction of the tube seat (1) in step S2, the wire rope is guided by the first fixed pulley (33), the second fixed pulley (34) and the third fixed pulley (35) in sequence, converting the axial tension of the lifting seat (31) into the synchronous radial traction force of each slider (4), so that multiple arc pressure components (6) move synchronously towards the center of the tube seat (1) and apply uniform radial pressure to the outer surface of the pump casing.

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