A deep water pump casing hydraulic fatigue test device

Abstract

This invention provides a hydraulic fatigue testing device for deep-water pump housings, comprising a base, hydraulic telescopic rods, a limiting component, and an adjusting component. A lowering block is fixed to the top ends of two hydraulic telescopic rods, and a pressing head is bolted to the lower surface of the lowering block. Each adjusting component has a limiting component installed on it, and the adjusting components are slidably mounted on the base. Compared with the prior art, this invention has the following advantages: By setting the adjusting component on the base, the distance between two opposing fixed sleeves can be adjusted according to the outer diameter of the deep-water pump housing, making it suitable for deep-water pump housings of various sizes. By setting the limiting component on the adjusting component, the two forward and reverse double-threaded nuts in the limiting component can gradually approach each other under the action of a micro hydraulic push rod and a forward and reverse double-threaded screw, thereby making the pressing plate tightly adhere to the outer surface of the deep-water pump housing, facilitating subsequent fatigue testing of the deep-water pump housing.

Description

Technical Field

[0001] This invention belongs to the field of pump casing testing technology, and specifically relates to a hydraulic fatigue testing device for deep-water pump casings. Background Technology

[0002] Deep-water pumps are generally used in deep water. Since water pressure is directly proportional to water depth, meaning the deeper the water, the greater the water pressure. Therefore, before being put into use, deep-water pumps need to undergo hydraulic fatigue testing on their casing. Hydraulic fatigue testing is usually performed using a hydraulic fatigue testing machine. Chinese Patent No. CN109799089A discloses a hydraulic fatigue testing device and method, including a rotary valve and a cylinder. The rotary valve includes a valve body and a rotatable valve core housed within the valve body. The valve body has a return port, a high-pressure port, and an output port. Rotation of the valve core connects the output port to the return port or the high-pressure port. The valve core has a corresponding distribution groove. The cylinder is connected to the output port. By rotating the valve core, the output oil port alternately connects with the high-pressure oil port and the return oil port, thereby filling and releasing the inner cavity of the plunger cylinder to generate pulsating hydraulic oil. The pulsating hydraulic oil is input into the cylinder, and the pulsating pressure acts on the plunger, thus applying pressure to the test piece. The magnitude and frequency of the loading force of this experimental device are adjustable, and the duration of the loading force within one pulsation cycle is also adjustable. At the same time, this experimental device can be used for both bearing fatigue testing and static load testing of parts, achieving versatility.

[0003] In the above structure, the bearing track is designed to allow for testing of a single rolling element, or to connect with the piston cylinder of the loading device via another loading fixture (a flat block) to test multiple rolling elements. However, the size of the groove on the bearing track in this structure is fixed, and there are no positioning structures on its sides. When subjected to pressure from above, it may wobble, thus affecting the accuracy of the data. Therefore, we provide a hydraulic fatigue testing device for deep water pump housings. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a hydraulic fatigue testing device for deep-water pump casings to solve the problems mentioned in the background art.

[0005] The technical solution of the present invention is implemented as follows: a hydraulic fatigue testing device for a deep water pump casing includes a base, a hydraulic telescopic rod, a limiting component and an adjusting component. A placement seat is fixed at the middle position of the upper surface of the base, and the deep water pump casing is placed above the placement seat. A hydraulic telescopic rod is embedded on the left and right sides of the upper surface of the base, and a lowering block is fixed at the top of the two hydraulic telescopic rods.

[0006] Two guide rods are fixed on the base, the lowering block is slidably connected to the guide rods, and the extrusion head is installed on the lower end surface of the lowering block by bolts.

[0007] Multiple adjustment components are provided, and each adjustment component is equipped with a limiting component, and the adjustment component is slidably mounted on the base;

[0008] The limiting assembly includes a pressure plate, a fixing post, a connecting bearing, a connecting slider, and a miniature hydraulic push rod;

[0009] The adjustment assembly includes a locking nut one, a locking nut two, an electromagnetic brake, a driven sprocket, a mounting bearing, a fixed sleeve, a moving lead screw, a driving sprocket, and a drive motor.

[0010] In a preferred embodiment, a pressing head is bolted to the lower end surface of the lower moving block. The pressing head also includes a pressure sensor and is positioned directly above the placement seat.

[0011] The base has an inner cavity groove at the top, and two movable sliding grooves are formed on the upper surface of the base. The movable sliding grooves are connected to the inner cavity groove, and the bottom surface of the inner cavity groove is recessed downward to form two guide grooves.

[0012] In a preferred embodiment, in the adjustment assembly, two symmetrically distributed drive sprockets are movably mounted on the bottom surface of the inner cavity groove. Each group of drive sprockets includes three drive sprockets, which are arranged in an isosceles triangle and connected by a chain. The leftmost drive sprocket is connected to the output shaft of the drive motor.

[0013] Each set of driving sprockets has two driven sprockets connected to the chain inside, and the two opposite driven sprockets are respectively placed on the left and right sides of the deep water pump housing. A movable screw is installed on the driven sprocket, and the bottom end of the movable screw is movably connected to the mounting bearing. The mounting bearing is slidably connected to the bottom end of the inner cavity groove.

[0014] The fixed sleeve has a hollow interior and is open at both the top and bottom. The front and rear surfaces of the fixed sleeve are provided with sliding holes. An electromagnetic brake is fixed on the fixed sleeve.

[0015] The upper end of the movable lead screw passes through the electromagnetic brake and is placed inside the fixed sleeve. The first locking nut and the second locking nut are both slidably mounted on the outer ring surface of the fixed sleeve through the movable lead screw. The first locking nut is placed on the upper surface of the base, and the second locking nut is placed in the inner cavity groove.

[0016] In a preferred embodiment, the locking nut one and the locking nut two are completely identical in structure and size. The locking nut one has a movable nut integrally formed inside by two connecting blocks. The movable nut is threadedly connected to the movable screw, and the two connecting blocks are respectively slidably placed in the movable sliding hole.

[0017] In a preferred embodiment, the lower surface of the electromagnetic brake is rolledly connected to the upper surface of the driven sprocket via a ball bearing, and the lower surface of the electromagnetic brake does not directly contact the upper surface of the driven sprocket, thereby reducing the friction between the electromagnetic brake and the driven sprocket, facilitating the rotation of the driven sprocket, and thus facilitating the rotation of the moving lead screw.

[0018] The friction between the locking nut one and the upper surface of the base, and the friction between the locking nut two and the top of the inner cavity groove, are always greater than the friction between the driven sprocket and the electromagnetic brake. When the electromagnetic brake does not lock the moving screw, the moving screw will rotate under the action of the chain and the driven sprocket. At this time, the fixed sleeve will not rotate. The locking nuts one and two will gradually approach each other under the action of the moving screw, so that the locking nuts one and two are tightly attached to the base, so that the upper limiting component can fix the deep water pump housing.

[0019] In a preferred embodiment, the lower end surface of the driven sprocket does not directly contact the upper end surface of the outer ring of the mounting bearing. A limiting slider is provided on the outer bottom surface of the mounting bearing, and the limiting slider is slidably placed in the guide groove. The limiting slider has a T-shaped structure, and the guide groove structure is sized to match the limiting slider. The T-shaped limiting slider allows the mounting bearing to move left and right in the guide groove and restricts the mounting bearing from rotating with the driven sprocket, thereby facilitating the rotation of the moving lead screw.

[0020] In a preferred embodiment, in the limiting assembly, a connecting bearing is installed at the top of the fixed column, the fixed column is movably mounted on the fixed sleeve through the connecting bearing, a lifting cavity is provided inside the fixed column, and a connecting slide groove one and a connecting slide groove two are respectively opened on the left and right sides of the outer surface of the fixed column.

[0021] A double-threaded screw with opposite directions is movably installed in the lifting chamber via a bearing. Two double-threaded nuts with opposite directions are threaded onto the screw. A movable push rod is movably connected to the right side of the double-threaded nuts with a shaft pin. The other end of the movable push rod is movably connected to the right side surface of the pressure plate.

[0022] A connecting slider is provided on the left side of the outer surface of the fixed column. The connecting slider slides through the connecting groove and is connected to the positive and negative double threaded nuts above. The lower part of the connecting slider is connected to the telescopic rod of the micro hydraulic push rod.

[0023] As a preferred embodiment, the bottom end of the micro hydraulic push rod is provided with a sliding block. The sliding block has a T-shaped structure and slides through the movable slide groove and is placed in the inner cavity groove, which can limit the micro hydraulic push rod. When the micro hydraulic push rod drives the connecting slider to slide down, the micro hydraulic push rod will not rise because there is no force point.

[0024] The bottom end of the clamping plate is provided with a plug-in slider, which is slidably placed in the movable groove.

[0025] After adopting the above technical solution, the beneficial effects of the present invention are as follows: by setting an adjustment component on the base, multiple fixed sleeves are slidably set in the base, and the distance between two opposite fixed sleeves can be adjusted according to the outer diameter of the deep water pump shell, which is suitable for deep water pump shells of various sizes. The locking nuts one and two on the fixed sleeves are respectively placed on the inner and outer sides of the base, and a moving screw is movably installed in the fixed sleeve. The locking nuts one and two are threadedly connected to the moving screw, and the moving screw is connected to the drive motor through the driven sprocket, chain and drive sprocket. The drive motor can quickly and tightly fit the locking nuts one and two on the base, so that the upper limiting component can fix the deep water pump shell.

[0026] By setting a limiting component on the adjusting component, the two positive and negative double-threaded nuts in the limiting component can gradually approach each other under the action of the micro hydraulic push rod and the positive and negative double-threaded screw, thereby making the clamping plate tightly fit against the outer surface of the deep water pump housing, thus fixing the deep water pump housing, which is convenient for subsequent fatigue tests on the deep water pump housing. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0029] Figure 2 This is a schematic diagram showing the connection between the limiting component and the adjusting component of a hydraulic fatigue testing device for deep water pump casing according to the present invention.

[0030] Figure 3 This is a cross-sectional schematic diagram of the limiting component of a hydraulic fatigue testing device for a deep water pump casing according to the present invention.

[0031] Figure 4This is a schematic diagram of a locking nut for a hydraulic fatigue testing device for a deep-water pump casing according to the present invention.

[0032] Figure 5 This is a cross-sectional schematic diagram of the adjustment component of a hydraulic fatigue testing device for a deep-water pump casing according to the present invention.

[0033] Figure 6 This is a schematic diagram showing the connection between multiple driving sprockets and driven sprockets in a hydraulic fatigue testing device for a deep-water pump casing according to the present invention.

[0034] Figure 7 This is a partial cross-sectional schematic diagram of a hydraulic fatigue testing device for a deep water pump casing according to the present invention.

[0035] Figure 8 This is an enlarged schematic diagram of point A of the hydraulic fatigue testing device for deep water pump casing according to the present invention.

[0036] In the diagram, 1-base, 11-inner cavity groove, 12-moving slide rail, 13-guide slide rail, 2-hydraulic telescopic rod, 3-guide rod, 4-lowering block, 5-pressing head, 6-limiting component, 61-pressing plate, 611-moving push rod, 612-insertion slider, 62-fixed column, 621-connecting slide rail one, 622-connecting slide rail two, 623-positive and negative double threaded screw, 624-lifting cavity, 625-positive and negative double threaded screw. Nut, 63-Connecting bearing, 64-Connecting slider, 65-Miniature hydraulic push rod, 7-Adjusting component, 71-Locking nut one, 711-Moving nut, 72-Locking nut two, 73-Electromagnetic brake, 74-Driven sprocket, 75-Mounting bearing, 751-Limit slider, 76-Fixing sleeve, 77-Moving lead screw, 78-Drive sprocket, 781-Chain, 79-Drive motor, 8-Deep water pump housing, 9-Placement seat. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0038] Please see Figures 1 to 8 The present invention provides a technical solution: a hydraulic fatigue testing device for a deep water pump casing, comprising a base 1, a hydraulic telescopic rod 2, a limiting component 6 and an adjusting component 7. A placement seat 9 is fixed at the middle position of the upper surface of the base 1, and the deep water pump casing 8 is placed above the placement seat 9. A hydraulic telescopic rod 2 is embedded on the left and right sides of the upper surface of the base 1, and a lowering block 4 is fixed at the top of the two hydraulic telescopic rods 2.

[0039] Two guide rods 3 are fixed on the base 1, the lowering block 4 is slidably connected to the guide rods 3, and the extrusion head 5 is installed on the lower end surface of the lowering block 4 by bolts;

[0040] Multiple adjustment components 7 are provided, and each adjustment component 7 is equipped with a limit component 6, and the adjustment component 7 is slidably mounted on the base 1.

[0041] As an embodiment of the present invention, please refer to Figures 1 to 8 The lower end surface of the lower moving block 4 is bolted with an extrusion head 5, which also includes a pressure sensor, and the extrusion head 5 is positioned directly above the placement seat 9;

[0042] The base 1 has an inner cavity groove 11 at the top inside. The upper surface of the base 1 has two movable slide grooves 12, which are connected to the inner cavity groove 11. The bottom surface of the inner cavity groove 11 is recessed downward to form two guide slide grooves 13.

[0043] In the adjustment assembly 7, the adjustment assembly 7 includes a locking nut 1 71, a locking nut 2 72, an electromagnetic brake 73, a driven sprocket 74, a mounting bearing 75, a fixing sleeve 76, a moving screw 77, a driving sprocket 78, and a drive motor 79. Two symmetrically distributed driving sprockets 78 are movably mounted on the bottom surface of the inner cavity groove 11. Each group of driving sprockets 78 includes three driving sprockets 78, which are distributed in an isosceles triangle and connected to each other by a chain 781. The leftmost driving sprocket 78 is connected to the output shaft of the drive motor 79. The isosceles triangle distribution of the three driving sprockets 78 means that only one side of the chain 781 on them is connected to the driven sprocket 74, which facilitates the left and right movement of the driven sprocket 74 and thus facilitates the adjustment of the position of the limit assembly 6.

[0044] Each set of driving sprockets 78 has two driven sprockets 74 connected to the chain 781. The two opposite driven sprockets 74 are respectively placed on the left and right sides of the deep water pump housing 8. A movable screw 77 is installed on the driven sprocket 74. The bottom end of the movable screw 77 is movably connected to the mounting bearing 75. The mounting bearing 75 is slidably connected to the bottom end of the inner cavity groove 11.

[0045] The fixed sleeve 76 has a hollow interior and is open at both the top and bottom. The front and rear surfaces of the fixed sleeve 76 are provided with sliding holes. An electromagnetic brake 73 is fixed on the fixed sleeve 76.

[0046] The upper end of the movable lead screw 77 passes through the electromagnetic brake 73 and is placed inside the fixed sleeve 76. Locking nut 1 71 and locking nut 2 72 are both slidably mounted on the outer ring surface of the fixed sleeve 76 through the movable lead screw 77. Locking nut 1 71 is placed on the upper surface of the base 1, and locking nut 2 72 is placed in the inner cavity groove 11.

[0047] Locking nut 1 71 and locking nut 2 72 have the same structure and size. Locking nut 1 71 has a movable nut 711 integrally formed inside by two connecting blocks. The movable nut 711 is threadedly connected to the movable screw, and the two connecting blocks are slidably placed in the movable sliding hole respectively.

[0048] The lower end surface of the electromagnetic brake 73 is rolledly connected to the upper end surface of the driven sprocket 74 through a ball bearing, and the lower end surface of the electromagnetic brake 73 does not directly contact the upper end surface of the driven sprocket 74, thereby reducing the friction between the electromagnetic brake 73 and the driven sprocket 74, facilitating the rotation of the driven sprocket 74, and thus facilitating the rotation of the moving screw 77.

[0049] The friction between locking nut 1 71 and the upper surface of base 1, and the friction between locking nut 2 72 and the top of inner cavity groove 11 are always greater than the friction between driven sprocket 74 and electromagnetic brake 73. When electromagnetic brake 73 is not locked to moving screw 77, moving screw 77 will rotate under the action of chain 781 and driven sprocket 74. At this time, fixed sleeve 76 will not rotate. Locking nut 1 71 and locking nut 2 72 will gradually approach each other under the action of moving screw 77, so that locking nut 1 71 and locking nut 2 72 are tightly attached to base 1, so that the upper limiting component 6 can fix the deep water pump housing 8.

[0050] The lower end surface of the driven sprocket 74 does not directly contact the upper end surface of the outer ring of the mounting bearing 75. The outer bottom end surface of the mounting bearing 75 is provided with a limiting slider 751, and the limiting slider 751 is slidably placed in the guide groove 13. The limiting slider 751 has a T-shaped structure, and the guide groove 13 has a structure and its size matches that of the limiting slider 751. The T-shaped limiting slider 751 allows the mounting bearing 75 to move left and right in the guide groove 13, and can restrict the mounting bearing 75 from rotating with the driven sprocket 74, thereby facilitating the rotation of the moving lead screw 77.

[0051] In actual use, first place the deep-water pump housing 8 on the placement base 9 (the deep-water pump housing 8 is the outer shell of a stainless steel submersible pump, which is a cylindrical structure). Then adjust the spacing between the fixing sleeves 76 on the multiple adjusting components 7 so that the limiting component 6 is close to the outer surface of the deep-water pump housing 8. Specifically, first disconnect the power supply to the electromagnetic brake 73. After the power is disconnected, the armature inside the electromagnetic brake 73 presses the rotor between the armature and the cover plate under the action of the spring force. At this time, the electromagnetic brake 73 will fix the moving lead screw 77, thereby connecting the moving lead screw 77, the electromagnetic brake 73, and the driven sprocket 74 into a whole. Then the user holds the fixing post 62 and moves the clamping plate 61 towards the deep-water pump housing 8. The pump housing 8 moves to one side until the clamping plate 61 contacts the surface of the deep pump housing 8. During the movement of the fixed column 62, since the driven sprocket 74 is connected to the chain 781, the driven sprocket 74 will rotate during the movement. At this time, the moving screw 77, the electromagnetic brake 73 and the driven sprocket 74 are connected as a whole. During the rotation of the moving screw 77 driven by the driven sprocket 74, the fixed sleeve 76 will rotate synchronously with the moving screw 77. In this way, the locking nut 1 71 and locking nut 2 72 on the fixed sleeve 76 will rotate, and thus cannot rise or fall, so the fixed sleeve 76 will not be locked, which facilitates the movement of the fixed sleeve 76.

[0052] When the clamping plate 61 contacts the surface of the deep-water pump housing 8, the fixing sleeve 76 can be locked, preventing it from moving. Specifically, when the power supply to the electromagnetic brake 73 is turned on, the coil winding in the electromagnetic brake 73 is supplied with the rated voltage. Under the action of electromagnetic force, the armature compresses the torque spring and is attracted to the end face of the slot plate. At this time, the rotor is released, and the fixing between the moving screw 77 and the electromagnetic brake 73 is released. Because the friction between the locking nut 1 71 and the upper surface of the base 1 and the friction between the locking nut 2 72 and the top of the inner cavity slot 11 are always greater than the friction between the driven sprocket 74 and the electromagnetic brake 73, the moving screw 77 rotates... When in motion, the fixed sleeve 76 will not rotate, which will cause the moving nut 711 inside the locking nut 1 71 and locking nut 2 72 to make a linear displacement on the moving screw 77. The locking nut 1 71 and locking nut 2 72 will gradually approach each other and fit tightly against the base 1, so that the upper limiting component 6 can fix the deep water pump housing 8. Then, the deep water pump housing 8 can be fixed by the pressure plate 61. After the fixation is completed, the hydraulic telescopic rod 2 is activated, which causes the lowering block 4 to drive the extrusion head 5 to move down and contact the surface of the deep water pump housing 8. The extrusion head 5 will generate pressure on the surface of the deep water pump housing 8 to test its fatigue strength.

[0053] By setting an adjustment component 7 on the base 1, multiple fixing sleeves 76 are slidably set inside the base 1. The distance between two opposing fixing sleeves 76 can be adjusted according to the outer diameter of the deep water pump housing 8. This is suitable for deep water pump housings 8 of various sizes. Locking nuts 71 and 72 on the fixing sleeves 76 are placed on the inner and outer sides of the base 1, respectively. A movable screw 77 is movably installed inside the fixing sleeves 76. Locking nuts 71 and 72 are threadedly connected to the movable screw 77. The movable screw 77 is connected to the drive motor 79 through the driven sprocket 74, chain 781, and drive sprocket 78. The drive motor 79 can quickly and tightly fit the locking nuts 71 and 72 onto the base 1, so that the upper limiting component 6 can fix the deep water pump housing 8.

[0054] As an embodiment of the present invention, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 7 In the limiting component 6, the limiting component 6 includes a clamping plate 61, a fixed column 62, a connecting bearing 63, a connecting slider 64, and a micro hydraulic push rod 65. The top of the fixed column 62 is equipped with a connecting bearing 63. The fixed column 62 is movably mounted on the fixed sleeve 76 through the connecting bearing 63. The fixed column 62 is provided with a lifting cavity 624 inside. The left and right sides of the outer surface of the fixed column 62 are respectively provided with a first connecting groove 621 and a second connecting groove 622.

[0055] Inside the lifting chamber 624, a double-threaded screw 623 is movably installed via a bearing. Two double-threaded nuts 625 are threaded onto the double-threaded screw 623. A movable push rod 611 is movably connected to the right side of the double-threaded nuts 625 via a shaft pin. The other end of the movable push rod 611 is movably connected to the right side surface of the pressure plate 61.

[0056] A connecting slider 64 is provided on the left side of the outer surface of the fixed column 62. The connecting slider 64 slides through the connecting groove 621 and is connected to the positive and negative double threaded nut 625 above. The lower part of the connecting slider 64 is connected to the telescopic rod of the micro hydraulic push rod 65.

[0057] The bottom end of the miniature hydraulic push rod 65 is provided with a sliding block. The sliding block has a T-shaped structure and slides through the movable slide groove 12 and is placed in the inner cavity groove 11. It can limit the miniature hydraulic push rod 65. When the miniature hydraulic push rod 65 drives the connecting slider 64 to slide down, the miniature hydraulic push rod 65 will not rise because there is no force point.

[0058] The bottom end of the clamping plate 61 is provided with a plug-in slider 612, which is slidably placed in the movable slide groove 12.

[0059] In actual use, after the fixing sleeve 76 is moved to the designated position, that is, when the clamping plate 61 contacts the surface of the deep water pump housing 8, the power supply to the micro hydraulic push rod 65 is turned on, causing the micro hydraulic push rod 65 to retract downwards. Since a double-threaded screw 623 is movably installed in the lifting chamber 624 of the fixing column 62, and two double-threaded nuts 625 are threaded onto the double-threaded screw 623 (the double-threaded screw 623 is constructed by welding two identical double-threaded screws 623, and these two double-threaded screws 623 are symmetrically designed about the connection point), the upper double-threaded nuts 625 will be used in the micro hydraulic push rod... The rod 65 moves downward. The self-locking performance of the double-threaded screw 623 and the double-threaded nut 625 is poor. When the upper double-threaded nut 625 moves downward, it will cause the double-threaded screw 623 to rotate. At this time, the lower double-threaded nut 625 will rise under the action of the double-threaded screw 623 (the two double-threaded nuts 625 move synchronously). At this time, the moving push rod 611 on the double-threaded nut 625 will cause the clamping plate 61 to move inward, so that the clamping plate 61 is tightly attached to the outer surface of the deep water pump housing 8, thereby fixing the deep water pump housing 8.

[0060] By setting a limiting component 6 on the adjusting component 7, the two positive and negative double threaded nuts 625 in the limiting component 6 can gradually approach each other under the action of the micro hydraulic push rod 65 and the positive and negative double threaded screw 623, thereby making the clamping plate 61 tightly adhere to the outer surface of the deep water pump housing 8, thereby fixing the deep water pump housing 8, which is convenient for subsequent fatigue tests on the deep water pump housing 8.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydraulic fatigue testing device for a deep-water pump casing, comprising a base (1), a hydraulic telescopic rod (2), and a limiting assembly (6) to... and adjustment component (7), wherein a placement seat (9) is fixed at the middle position of the upper surface of the base (1), and the deep water pump housing (8) is placed above the placement seat (9), characterized in that, A hydraulic telescopic rod (2) is embedded on the left and right sides of the upper surface of the base (1), and the lowering block (4) is fixed on the top of the two hydraulic telescopic rods (2); Two guide rods (3) are fixed on the base (1), the lowering block (4) is slidably connected to the guide rods (3), and the extrusion head (5) is installed on the lower end surface of the lowering block (4) by bolts; Multiple adjustment components (7) are provided, and each adjustment component (7) is equipped with a limiting component (6), and the adjustment component (7) is slidably mounted on the base (1); The limiting component (6) includes a pressure plate (61), a fixing post (62), a connecting bearing (63), a connecting slider (64), and a miniature hydraulic push rod (65); In the limiting assembly (6), a connecting bearing (63) is installed at the top of the fixed column (62), the fixed column (62) is movably installed on the fixed sleeve (76) through the connecting bearing (63), a lifting cavity (624) is provided inside the fixed column (62), and a connecting slide groove one (621) and a connecting slide groove two (622) are respectively opened on the left and right sides of the outer surface of the fixed column (62); A double-threaded screw (623) is movably installed in the lifting chamber (624) via a bearing. Two double-threaded nuts (625) are threaded onto the double-threaded screw (623). A movable push rod (611) is movably connected to the right side of the double-threaded nuts (625) via a shaft pin. The other end of the movable push rod (611) is movably connected to the right side surface of the pressure plate (61). A connecting slider (64) is provided on the left side of the outer surface of the fixed column (62). The connecting slider (64) slides through the connecting groove (621) and is connected to the positive and negative double threaded nut (625) above. The lower part of the connecting slider (64) is connected to the telescopic rod of the micro hydraulic push rod (65). The adjustment assembly (7) includes a locking nut one (71), a locking nut two (72), an electromagnetic brake (73), a driven sprocket (74), a mounting bearing (75), a fixed sleeve (76), a moving screw (77), a driving sprocket (78), and a drive motor (79). In the adjustment assembly (7), two symmetrically distributed driving sprockets (78) are movably installed on the bottom surface of the inner cavity groove (11). Each group of driving sprockets (78) includes three driving sprockets (78), which are arranged in an isosceles triangle and connected by a chain (781). The leftmost driving sprocket (78) is connected to the output shaft of the drive motor (79). Each set of driving sprockets (78) has two driven sprockets (74) connected in the chain (781), and the two opposite driven sprockets (74) are respectively placed on the left and right sides of the deep water pump housing (8). A moving screw (77) is installed on the driven sprocket (74), and the bottom end of the moving screw (77) is movably connected to the mounting bearing (75). The mounting bearing (75) is slidably connected to the bottom end of the inner cavity groove (11). The fixed sleeve (76) has a hollow interior and is open at both the top and bottom. The front and rear surfaces of the fixed sleeve (76) are provided with sliding holes. An electromagnetic brake (73) is fixed on the fixed sleeve (76). The upper end of the movable lead screw (77) passes through the electromagnetic brake (73) and is placed inside the fixed sleeve (76). The locking nut one (71) and the locking nut two (72) are both slidably mounted on the outer ring surface of the fixed sleeve (76) through the movable lead screw (77). The locking nut one (71) is placed on the upper surface of the base (1), and the locking nut two (72) is placed in the inner cavity groove (11).

2. The deep well pump housing hydraulic fatigue test device of claim 1, wherein: The lower end surface of the lower moving block (4) is bolted with an extrusion head (5), which also includes a pressure sensor, and the extrusion head (5) is positioned directly above the placement seat (9); The base (1) has an inner cavity groove (11) at the top inside. The upper surface of the base (1) has two movable sliding grooves (12) connected to the inner cavity groove (11). The bottom surface of the inner cavity groove (11) is recessed downward to form two guide grooves (13).

3. The hydraulic fatigue testing device for deep-water pump casing as described in claim 2, characterized in that: The locking nut one (71) and the locking nut two (72) have the same structure and size. The locking nut one (71) has a movable nut (711) integrally formed inside by two connecting blocks. The movable nut (711) is threadedly connected to the movable screw, and the two connecting blocks are respectively slidably placed in the movable sliding hole.

4. The deep well pump housing hydraulic fatigue test apparatus as set forth in claim 1, wherein: The lower end surface of the electromagnetic brake (73) is rolledly connected to the upper end surface of the driven sprocket (74) through a ball bearing, and the lower end surface of the electromagnetic brake (73) does not directly contact the upper end surface of the driven sprocket (74), thereby reducing the friction between the electromagnetic brake (73) and the driven sprocket (74), facilitating the rotation of the driven sprocket (74), and thus facilitating the rotation of the moving screw (77); The friction between the locking nut one (71) and the upper surface of the base (1) and the friction between the locking nut two (72) and the top of the inner cavity groove (11) are always greater than the friction between the driven sprocket (74) and the electromagnetic brake (73). When the electromagnetic brake (73) does not lock the moving screw (77), the moving screw (77) will rotate under the action of the chain (781) and the driven sprocket (74). At this time, the fixed sleeve (76) will not rotate. The locking nut one (71) and the locking nut two (72) will gradually approach each other under the action of the moving screw (77), so that the locking nut one (71) and the locking nut two (72) are tightly attached to the base (1), so that the upper limiting component (6) can fix the deep water pump housing (8).

5. A deep well pump housing hydraulic fatigue testing apparatus as claimed in claim 4 wherein: The lower end surface of the driven sprocket (74) does not directly contact the upper end surface of the outer ring of the mounting bearing (75). The outer bottom end surface of the mounting bearing (75) is provided with a limiting slider (751), and the limiting slider (751) is slidably placed in the guide groove (13). The limiting slider (751) has a T-shaped structure. The guide groove (13) has a structure and its size matches that of the limiting slider (751). The T-shaped limiting slider (751) allows the mounting bearing (75) to move left and right in the guide groove (13) and restricts the mounting bearing (75) from rotating with the driven sprocket (74), thereby facilitating the rotation of the moving screw (77).

6. A deep well pump housing hydraulic fatigue testing apparatus as claimed in claim 5 wherein: The bottom end of the micro hydraulic push rod (65) is provided with a sliding block. The sliding block has a T-shaped structure and slides through the movable slide groove (12) and is placed in the inner cavity groove (11). It can limit the micro hydraulic push rod (65). When the micro hydraulic push rod (65) drives the connecting slider (64) to slide down, the micro hydraulic push rod (65) will not rise because there is no force point. The bottom end of the clamping plate (61) is provided with a plug-in slider (612), which is slidably placed in the movable groove (12).

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