A corrosion fatigue testing device

Abstract

The present invention belongs to the technical field of corrosion testing equipment, and provides a corrosion fatigue testing equipment. The equipment of the present invention includes a support platform, a corrosion device, a sample loading moving device, a fatigue loading device, a control box and a clamping device, wherein the corrosion device includes a corrosion box, a liquid replenishing box, a waste liquid box and a monitoring device; the sample loading moving device and the fatigue loading device fixedly arranged on the upper side of the sample loading moving device are both arranged in the control box and can move horizontally along the length direction of the support platform; the clamping device includes a stand, a balance bar and two support bars; the corrosion box is arranged on the table of the support platform, and the clamping device is arranged on one side of the corrosion box and passes through the corrosion box to be connected with the fatigue loading device arranged on the other side of the corrosion box. According to the corrosion fatigue testing equipment of the present invention, the rapid installation of the C-ring specimen and the long-term stable loading of the dynamic cyclic stress can be realized, and the corrosion fatigue performance of the workpiece can be detected more accurately and truly.

Description

Technical Field

[0001] The invention relates to the technical field of corrosion testing equipment, and in particular to corrosion fatigue testing equipment. Background Art

[0002] The fracture failure phenomenon of metal or alloy materials under the combined action of corrosive environment and alternating stress is called corrosion fatigue fracture. In the fields of oil extraction, metallurgy, chemical industry, offshore operation platform, aerospace, etc., almost all commonly used corrosion-resistant steels and alloys will suffer from corrosion fatigue. Due to the existence of corrosion fatigue, parts and equipment will suddenly break and be damaged without any signs, which will cause serious safety hazards to the entire application end system engineering.

[0003] Corrosion fatigue testing equipment is a special equipment for testing the corrosion fatigue performance of materials. At present, vertical corrosion fatigue testing equipment is widely used in domestic laboratories. In practical applications, vertical corrosion fatigue testing equipment is large in size, difficult to seal the contact parts, prone to leakage, high equipment failure rate, and the specimen may even penetrate the bottom of the corrosion box during corrosion testing.

[0004] The Chinese patent application publication number CN212111069U discloses an environmental device for corrosion fatigue testing of metal materials, including a corrosion fatigue testing environmental device body, a heating power supply fixedly connected to the bottom of the device, a liquid pump fixedly connected to the top, a liquid outlet fixedly connected to the output port of the liquid pump, and a liquid outlet fixedly connected to a corrosive liquid nozzle and an adjusting block. The patent creates a good corrosion environment and improves the accuracy of the test, but when the liquid pump is pumping liquid, the corrosive liquid will corrode the liquid pump and damage the equipment, and the equipment is inconvenient for monitoring the corrosion of the sample during the corrosion fatigue test. The Chinese patent application publication number CN108732084A discloses a device for corrosion fatigue testing of test specimens, including an upper cover plate, a corrosion cavity, a test specimen to be corroded, and a lower cover plate. The upper cover plate, the corrosion cavity, and the lower cover plate are arranged in sequence from top to bottom. The test specimen to be corroded is arranged inside the corrosion cavity, and a first fixing member, a second fixing member, and a sealing plug are arranged between the upper cover plate and the lower cover plate. The device adopts a design combining fixings and sealing plugs to achieve the test of corrosion fatigue performance of the specimen, but there are still problems of corrosion fluid leakage and firmware corrosion under long-term cyclic stress testing. In addition, the corrosion fluid of existing corrosion fatigue testing equipment is inconvenient to replenish, and the corrosion crack length of the sample cannot be measured when the equipment is running.

[0005] Therefore, how to provide a corrosion fatigue detection device with a small device size, a corrosion box that does not leak, convenient corrosion liquid replenishment, and accurate crack observation and measurement has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] In view of this, in order to overcome the deficiencies of the prior art, the present invention realizes the loading of dynamic cyclic stress through comprehensive structural design, and effectively solves the difficult problem of corrosion performance detection of C-ring specimens under variable stress.

[0007] The present invention provides a corrosion fatigue testing device, comprising a support platform, a corrosion device, a sample loading and moving device, a fatigue loading device, a control box and a clamping device, wherein the corrosion device comprises a corrosion box, a liquid replenishing box, a waste liquid box and a monitoring device; the sample loading and moving device and the fatigue loading device fixedly arranged on the upper side of the sample loading and moving device are both arranged in the control box and can move horizontally along the length direction of the support platform; the clamping device comprises a stand, a balance bar and two support bars; the corrosion box is arranged on the table surface of the support platform, and the clamping device is arranged on one side of the corrosion box and passes through the corrosion box to be connected with the fatigue loading device arranged on the other side of the corrosion box.

[0008] Preferably, in the corrosion fatigue testing equipment of the present invention, the sample loading and moving device is composed of a first base, a guide rail groove, a mobile box, a first screw rod, a first screw rod rack, a first controller, a first motor, a first gearbox, a first power gear, a first transmission gear and a first limiter, wherein two guide rail grooves are symmetrically arranged on both sides of the first base parallel to the length direction of the support platform, and the first screw rod is arranged above the first base parallel to the guide rail groove and axially fixed by the first screw rod rack; the bottom of the mobile box is movably assembled in the guide rail groove of the first base, the first controller, the first motor and the first gearbox are fixedly arranged in the mobile box and move synchronously with the mobile box, the first controller is electrically connected to the first motor, the first motor is connected to the first gearbox gear, the first power gear is arranged on the outside of the mobile box and fixedly connected to the first gearbox, the first transmission gear is coaxially assembled on the outside of the first screw rod and is engaged in the first limit slot of the first limiter fixedly arranged on the outside of the mobile box, the inner side of the first transmission gear is meshed with the first screw rod, and the outer side of the first transmission gear is meshed with the first power gear; a plurality of first fixing holes are evenly distributed on the top of the mobile box.

[0009] Preferably, in the corrosion fatigue testing equipment of the present invention, the fatigue loading device is composed of a second base, a second screw rod, a second screw rod frame, a second controller, a second motor, a second gearbox, a second power gear, a second transmission gear, and a second limiter, wherein the second screw rod is arranged above the second base parallel to the guide rail groove and movably assembled on the second screw rod frame, and a first assembly groove is arranged at one end of the second screw rod; the second controller, the second motor and the second gearbox are fixedly arranged on the second base and move synchronously with the second base, the second controller is electrically connected to the second motor, the second motor is connected to the second gearbox gear, the second power gear is fixedly connected to the second gearbox, the second transmission gear is coaxially assembled on the outside of the second screw rod and is engaged in the second limit slot of the second limiter fixedly arranged on the second base, the inner side of the second transmission gear is meshed with the second screw rod, and the outer side of the second transmission gear is meshed with the second power gear, a plurality of second fixing holes respectively matching the first fixing holes are distributed on the second base, the second base is assembled on the top of the movable box body, and is fastened to the second fixing hole through the first fixing hole.

[0010] Preferably, in the corrosion fatigue testing equipment of the present invention, the stand is fixed on the table on one side of the corrosion box, a connecting rod is fixedly arranged on the inner side surface of the stand, and a second assembly groove is arranged on the outer end of the connecting rod; a third assembly groove is arranged at one end of the support rod, and the outer end surface of the end is composed of symmetrically arranged beveled surfaces and a clamping surface arranged between the two beveled surfaces, and an axial protrusion is arranged at the other end of the support rod; the axial protrusion of the support rod is respectively matched with the second assembly groove of the connecting rod and the first assembly groove at one end of the second screw rod, and the two ends of the balance rod are respectively assembled in the third assembly groove of the symmetrically arranged support rod.

[0011] Preferably, in the corrosion fatigue testing device of the present invention, circular through holes are provided on both side boxes of the corrosion box, rubber soft rings are provided on the inner walls of the circular through holes, and the support rod is coaxially assembled inside the rubber soft rings of the circular through holes.

[0012] Preferably, in the corrosion fatigue testing equipment of the present invention, a liquid inlet is arranged on one side of the corrosion box, and a liquid inlet pipe is vertically arranged on the inner side of the corrosion box and connected with the liquid inlet; a liquid drain is arranged at the bottom of the corrosion box, and a liquid drain valve is arranged on the liquid drain; the liquid inlet of the corrosion box is connected with a liquid replenishment port at the lower part of one side of the liquid replenishment box fixedly arranged on the top of the control box through a liquid replenishment pipe, and a liquid replenishment valve is arranged on the liquid replenishment port; the liquid discharge port of the corrosion box is connected with a waste liquid tank fixedly arranged under the support platform through a liquid discharge pipe.

[0013] Preferably, in the corrosion fatigue testing equipment of the present invention, the corrosion box, the liquid inlet pipe, the liquid discharge valve and the liquid replenishment valve are made of tempered glass.

[0014] Preferably, in the corrosion fatigue testing equipment of the present invention, the monitoring device includes a monitoring cylinder, an objective lens end, a first mirror, a second mirror, a third mirror and an eyepiece end, the monitoring cylinder as a whole is in a broken line shape, the objective lens end is arranged at the bottom end of the monitoring cylinder, and the eyepiece end is arranged at the top end of the monitoring cylinder, wherein the objective lens end is vertically arranged directly below the center of the balance bar in the clamping device, and the axis of the eyepiece end is parallel to the horizontal plane; the first mirror, the second mirror and the third mirror are respectively inclinedly arranged at the bottom end, the angle end and the top end of the monitoring cylinder, wherein the first mirror and the second mirror are symmetrically arranged, and the second mirror and the third mirror are parallelly arranged.

[0015] Preferably, in the corrosion fatigue testing equipment of the present invention, a liquid crystal control panel is provided on the control box, which is used to control the sample loading moving device and the fatigue loading device by setting parameters such as the moving distance, loading stress size, stress cycle rate, cycle time, etc., and is also used to display the current operating status parameters of the equipment.

[0016] Preferably, in the corrosion fatigue testing equipment of the present invention, the balance rod and the support rod are made of high-strength corrosion-resistant alloy material.

[0017] The corrosion fatigue testing equipment of the present invention has the following beneficial effects:

[0018] 1. Through the comprehensive structural design of the sample loading and moving device, the fatigue loading device and the clamping device, the rapid installation of the C-ring specimen and the long-term stable loading of the dynamic cyclic stress can be achieved. By replacing the static stress corrosion test with the corrosion fatigue test, a more realistic corrosion fatigue environment can be provided. When the corrosion fatigue test is performed on the workpiece working in a high-concentration corrosion environment and bearing constantly changing stress, the performance of the workpiece can be detected more accurately and realistically.

[0019] 2. The overall horizontal structural design effectively avoids the problems of corrosive liquid leakage and fixture corrosion during the test.

[0020] 3. Through the structural design of the monitoring device, it is possible to monitor whether cracks appear in the sample during the detection process, and to accurately measure the crack length and record the crack expansion after the crack appears.

[0021] 4. The equipment is small in size and easy to operate. Through the setting of the liquid replenishment tank and the waste liquid tank, it can realize convenient and fast liquid preparation and liquid replacement, and the recycling and treatment of corrosive waste liquid is convenient and safe. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 It is a schematic structural diagram of a corrosion fatigue testing device according to an exemplary first embodiment of the present invention.

[0024] Figure 2 It is a schematic structural diagram of a sample loading and moving device of a corrosion fatigue testing device according to an exemplary second embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of the partial structure of the sample loading and moving device of the corrosion fatigue testing equipment according to the second exemplary embodiment of the present invention.

[0026] Figure 4 It is a schematic structural diagram of a fatigue loading device of a corrosion fatigue testing device according to an exemplary second embodiment of the present invention.

[0027] Figure 5 It is a schematic diagram of the partial structure of the fatigue loading device of the corrosion fatigue testing equipment according to the second exemplary embodiment of the present invention.

[0028] Figure 6 It is a schematic diagram of the partial structure of the clamping device of the corrosion fatigue testing equipment according to the second exemplary embodiment of the present invention.

[0029] Figure 7 It is a schematic structural diagram of a support rod of a corrosion fatigue testing device according to a second exemplary embodiment of the present invention.

[0030] Figure 8 It is a schematic diagram of the partial structure of the support rod of the corrosion fatigue testing equipment according to the second exemplary embodiment of the present invention.

[0031] Fig. 9 It is a schematic diagram of the partial structure of the corrosion fatigue testing equipment according to the third exemplary embodiment of the present invention.

[0032] Fig.10 It is a schematic diagram of the partial structure of the corrosion fatigue testing equipment according to the third exemplary embodiment of the present invention.

[0033] Fig.11 It is a schematic diagram of the structure of the C-ring specimen in the first to third exemplary embodiments of the present invention.

[0034] In the figure, 1-support table, 2-corrosion device, 21-corrosion box, 22-liquid replenishing box, 23-waste liquid box, 24-monitoring device, 3-sample loading mobile device, 4-fatigue loading device, 5-control box, 51-liquid crystal control panel, 6-clamping device, 61-stand, 62-balance rod, 63-support rod, 7-C-ring sample, 701-sample hole; 301-first base, 302-guide groove, 303-moving box, 304-first screw rod, 305-first screw rod rack, 306-first controller, 307-first motor, 308-first gearbox, 309-first power gear, 310-first transmission gear, 311-first limiter, 312-first limit slot, 313-first fixing hole; 401-second base, 402-second screw rod, 403-second screw rod rack, 404 -second controller, 405-second motor, 406-second gearbox, 407-second power gear, 408-second transmission gear, 409-second limiter, 410-first assembly groove, 411-second limit slot, 412-second fixing hole; 611-connecting rod, 612-second assembly groove; 631-third assembly groove, 632-beveled surface, 633-clamping surface, 634-axial protrusion; 211-circular through hole, 212-rubber soft ring, 213-liquid inlet, 214-liquid inlet pipe, 215-liquid discharge port, 216-liquid discharge valve, 221-liquid replenishment port, 222-liquid replenishment pipe, 223-liquid replenishment valve, 231-liquid discharge pipe; 241-monitoring cylinder, 242-objective lens end, 243-first mirror surface, 244-second mirror surface, 245-third mirror surface, 246-eyepiece end. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0036] It should be noted that the following embodiments and features in the embodiments may be combined with each other in the absence of conflict; and, based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making any creative work are within the scope of protection of the present disclosure.

[0037] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein may be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein may be implemented independently of any other aspect, and two or more of these aspects may be combined in various ways. For example, any number of aspects described herein may be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein may be used to implement this device and / or practice this method.

[0038] Figure 1 FIG. 1 is a schematic structural diagram of a corrosion fatigue testing device according to a first exemplary embodiment of the present invention. Figure 1 As shown, the corrosion fatigue testing equipment of this embodiment includes a support platform 1, a corrosion device 2, a sample loading and moving device 3, a fatigue loading device 4, a control box 5 and a clamping device 6, wherein the corrosion device 2 includes a corrosion box 21, a liquid replenishing box 22, a waste liquid box 23 and a monitoring device 24; the sample loading and moving device 3 and the fatigue loading device 4 fixedly arranged on the upper side of the sample loading and moving device 3 are both arranged in the control box 5 and can move horizontally along the length direction of the support platform 1; the clamping device 6 includes a stand 61, a balance bar 62 and two support bars 63; the corrosion box 21 is arranged on the table top of the support platform 1, and the clamping device 6 is arranged on one side of the corrosion box 21 and passes through the corrosion box 21 to be connected with the fatigue loading device 4 arranged on the other side of the corrosion box 21.

[0039] The corrosion fatigue test equipment of this embodiment realizes dynamic cyclic stress loading through the comprehensive structural design of the sample loading moving device 3, the fatigue loading device 4 and the clamping device 6, and effectively solves the problem that the existing C-type stress corrosion test equipment cannot detect the corrosion of the C-type ring sample 7 under variable stress. By replacing the static stress corrosion test with the corrosion fatigue test, a more realistic corrosion fatigue environment can be provided. When the corrosion fatigue test is performed on a workpiece (such as an oil fracturing pump) working in a high-concentration corrosion environment and bearing constantly changing stress, the performance of the workpiece can be obtained more accurately and realistically.

[0040] The second exemplary embodiment of the present invention provides a corrosion fatigue testing device. Figure 1 A preferred embodiment of the device is shown.

[0041] Specifically, in the device of this embodiment, the structure of the sample loading and moving device 3 is as follows: Figure 2 and Figure 3As shown, the sample loading moving device 3 is composed of a first base 301, a guide groove 302, a moving box 303, a first screw rod 304, a first screw rod frame 305, a first controller 306, a first motor 307, a first gearbox 308, a first power gear 309, a first transmission gear 310 and a first limiter 311, wherein two guide grooves 302 are symmetrically arranged on both sides of the first base 301 parallel to the length direction of the support table 1, the first screw rod 304 is arranged above the first base 301 parallel to the guide groove 302 and is axially fixed by the first screw rod frame 305; the bottom of the moving box 303 is movably assembled in the guide groove 302 of the first base 301, the first controller 306, the first motor 307 and the first gearbox 308 are symmetrically arranged on both sides of the first base 301, and the first screw rod 304 is arranged above the first base 301 parallel to the guide groove 302 and is axially fixed by the first screw rod frame 305. 8 is fixedly arranged in the mobile box 303 and moves synchronously with the mobile box 303, the first controller 306 is electrically connected to the first motor 307, the first motor 307 is gear-connected to the first gearbox 308, the first power gear 309 is arranged on the outside of the mobile box 303 and fixedly connected to the first gearbox 308, the first transmission gear 310 is coaxially assembled on the outside of the first screw rod 304 and is engaged in the first limit slot 312 of the first limiter 311 fixedly arranged on the outside of the mobile box 303, the inner side of the first transmission gear 310 is meshed with the first screw rod 304, and the outer side of the first transmission gear 310 is meshed with the first power gear 309; a plurality of first fixing holes 313 are evenly distributed on the top of the mobile box 303.

[0042] Specifically, in the device of this embodiment, the structure of the fatigue loading device 4 is as follows: Figure 4 and Figure 5As shown, the fatigue loading device 4 is composed of a second base 401, a second screw rod 402, a second screw rod frame 403, a second controller 404, a second motor 405, a second gearbox 406, a second power gear 407, a second transmission gear 408, and a second limiter 409, wherein the second screw rod 402 is arranged above the second base 401 parallel to the guide groove 302 and is movably assembled on the second screw rod frame 403, and a first assembly groove 410 is arranged at one end of the second screw rod 402; the second controller 404, the second motor 405 and the second gearbox 406 are fixedly arranged on the second base 401 and move synchronously with the second base 401, the second controller 404 is electrically connected to the second motor 405, and the second The motor 405 is gear-connected to the second gearbox 406, the second power gear 407 is fixedly connected to the second gearbox 406, the second transmission gear 408 is coaxially assembled on the outer side of the second screw rod 402 and is engaged in the second limit slot 411 of the second limiter 409 fixedly arranged on the second base 401, the inner side of the second transmission gear 408 is meshed with the second screw rod 402, the outer side of the second transmission gear 408 is meshed with the second power gear 407, a plurality of second fixing holes 412 respectively matching the first fixing holes 313 are distributed on the second base 401, the second base 401 is assembled on the top of the movable box 303, and is fastened to the second fixing holes 412 through the first fixing holes 313.

[0043] Specifically, in the device of this embodiment, the structure of the clamping device 6 is as follows: Figure 1 , Figure 6 , Figure 7 and Figure 8 As shown, the stand 61 is fixed on the table on one side of the corrosion box 21, a connecting rod 611 is fixedly arranged on the inner side surface of the stand 61, and a second assembly groove 612 is arranged on the outer end of the connecting rod 611; a third assembly groove 631 is arranged at one end of the support rod 63, and the outer end surface of the end is composed of symmetrically arranged chamfered surfaces 632 and a clamping surface 633 arranged between the two chamfered surfaces 632, and an axial protrusion 634 is arranged at the other end of the support rod 63; the axial protrusion 634 of the support rod 63 respectively matches the second assembly groove 612 of the connecting rod 611 and the first assembly groove 410 at one end of the second screw rod 402, and the two ends of the balance rod 62 are respectively assembled in the third assembly groove 631 of the symmetrically arranged support rod 63.

[0044] In this embodiment, the application principle of the sample loading and moving device 3 is as follows:

[0045] The first controller 306 controls the first motor 307 to work and rotate, and transmits the torque to the first power gear 309 through the first gearbox 308. The first power gear 309 is meshed with the outer transverse gear of the first transmission gear 310, which drives the first transmission gear 310 to rotate. The inner longitudinal gear of the first transmission gear 310 is meshed with the gear on the first screw rod 304. Since the first screw rod 304 is axially fixed by the first screw rod frame 305, the first screw rod 304 only rotates, and the first transmission gear 310 moves axially on the first screw rod 304. The first limit slot 312 of the first limiter 311 fixedly arranged on the outer side of the moving box 303 is engaged with the first transmission gear 310, so that the first transmission gear 310, the first limiter 311, and the moving box 303 keep synchronous movement, so that the moving box 303 moves horizontally on the first base 301 along the guide groove 302.

[0046] The function of the sample loading and moving device 3 is to load the C-ring sample 7 . It has the characteristics of large moving distance and fast moving speed and can move in the horizontal direction, thereby realizing the installation of the C-ring sample 7 .

[0047] In this embodiment, the application principle of the fatigue loading device 4 is as follows:

[0048] The second controller 404 controls the second motor 405 to work and rotate, and transmits the torque to the second power gear 407 through the second gearbox 406. The second power gear 407 and the second transmission gear 408 are meshed with the outer transverse gear of the ring, driving the second transmission gear 408 to rotate. The inner longitudinal gear of the second transmission gear 408 is meshed with the gear on the second screw rod 402. Since the second transmission gear 408 is engaged in the second limit slot 411 of the second limiter 409, the second limiter 409 is fixedly set on the second base 401, so that the second transmission gear 408 only rotates, so that the second screw rod 402 moves axially, and drives the support rod 63 connected to the second screw rod 402 to move synchronously. The second base 401 of the fatigue loading device 4 is fixedly assembled on the top of the moving box 303 of the sample loading mobile device 3, so the fatigue loading device 4 as a whole keeps synchronous movement with the sample loading mobile device 3.

[0049] The function of the fatigue loading device 4 is to load stress. It has the characteristics of short moving distance and precise movement, and can reciprocate in the horizontal direction, thereby realizing the loading of dynamic cyclic stress on the C-ring specimen 7.

[0050] In this embodiment, the application principle of the clamping device 6 is as follows:

[0051] The symmetrically arranged support rods 63 are respectively connected to the connecting rod 611 and one end of the second screw rod 402 and fixed by fasteners, and the balance rod 62 is assembled between the symmetrically arranged support rods 63; the C-ring specimen 7 is hung on the balance rod 62 through the specimen hole 701 and is clamped and fixed by the end of the support rod 63; the support rod 63 connected to the second screw rod 402 of the fatigue loading device 4 loads cyclic stress on the C-ring specimen 7 when the fatigue loading device 4 reciprocates.

[0052] In actual applications, the balance rod 62 and the support rod 63 are made of high-strength corrosion-resistant alloy material, which is suitable for long-term service operations in corrosive and variable stress loading environments. At the same time, the support rod 63 adopts a detachable structure design to facilitate cleaning, maintenance and replacement.

[0053] The outer end surface of one end of the support rod 63 is composed of symmetrically arranged beveled surfaces 632 and a clamping surface 633 arranged between the two beveled surfaces 632. When the C-ring specimen 7 is clamped and fixed, the clamping surface 633 contacts the centerline area of ​​the C-ring specimen 7, making the clamping more stable and avoiding uneven stress loading of the specimen due to the offset of the force point.

[0054] A liquid crystal control panel 51 is provided on the control box 5 of this embodiment, which is used to control the sample loading moving device 3 and the fatigue loading device 4 by setting parameters such as moving distance, loading stress size, stress cycle rate, cycle time, etc., and is also used to display the current operating status parameters of the equipment.

[0055] The third exemplary embodiment of the present invention provides a corrosion fatigue testing device. Figure 1 A preferred embodiment of the device shown in FIG. 1 is a device of this embodiment in which the corrosion device 2 includes a corrosion tank 21 , a liquid replenishment tank 22 , a waste liquid tank 23 and a monitoring device 24 .

[0056] Specifically, Figure 1 and Fig. 9 As shown, in the corrosion fatigue testing equipment in this embodiment, circular through holes 211 are set on the box bodies on both sides of the corrosion box 21, and rubber soft rings 212 are set on the inner walls of the circular through holes 211. The support rod 63 is coaxially assembled on the inner side of the rubber soft ring 212 of the circular through hole 211.

[0057] A liquid inlet 213 is provided on one side of the corrosion box 21 , and a liquid inlet pipe 214 is vertically provided inside the corrosion box 21 and communicated with the liquid inlet 213 ; a liquid discharge port 215 is provided at the bottom of the corrosion box 21 , and a liquid discharge valve 216 is provided on the liquid discharge port 215 .

[0058] The liquid inlet 213 of the corrosion box 21 is connected to the liquid replenishment port 221 at the lower part of one side of the liquid replenishment box 22 fixedly arranged on the top of the control box 5 through the liquid replenishment pipe 222, and a liquid replenishment valve 223 is arranged on the liquid replenishment port 221; the liquid discharge port 215 of the corrosion box 21 is connected to the waste liquid tank 23 fixedly arranged under the support platform 1 through the liquid discharge pipe 231.

[0059] In practical applications, the corrosion box 21, the liquid inlet pipe 214, the liquid discharge valve 216 and the liquid replenishment valve 223 are made of tempered glass, which has excellent corrosion resistance, shock resistance and sealing performance, and is suitable for loading and transmitting a variety of corrosive liquids. One end of the liquid inlet pipe 214 extends into the bottom of the corrosion box 21 to prevent the corrosive liquid from splashing when the liquid is inlet, and avoid corrosion to the C-ring sample 7, the support rod 63 and the balance rod 62.

[0060] In practical applications, in order to further reduce the impact of vibration on the corrosion box 21 during operation of the equipment, a rubber pad is provided at the bottom of the corrosion box 21; rubber pads can also be provided at the bottom of the liquid replenishment tank 22 and the waste liquid tank 23, respectively.

[0061] Before the test begins, the required etching liquid can be prepared and the time can be set to replace the etching liquid in the etching box 21. The waste liquid discharged after the test is collected in the waste liquid tank 23 and poured into a unified recovery device for centralized treatment at one time, making the test operation convenient and safe.

[0062] like Figure 1 , Fig. 9 and Fig.10 As shown, the monitoring device 24 includes a monitoring cylinder 241, an objective end 242, a first mirror 243, a second mirror 244, a third mirror 245 and an eyepiece end 246. The monitoring cylinder 241 is in a broken line shape as a whole. The objective end 242 is arranged at the bottom end of the monitoring cylinder 241, and the eyepiece end 246 is arranged at the top end of the monitoring cylinder 241, wherein the objective end 242 is vertically arranged directly below the center of the balance bar 62 in the clamping device 6, and the axis of the eyepiece end 246 is parallel to the horizontal plane; the first mirror 243, the second mirror 244 and the third mirror 245 are respectively tilted at the bottom end, the angle end and the top end of the monitoring cylinder 241, wherein the first mirror 243 and the second mirror 244 are symmetrically arranged, and the second mirror 244 and the third mirror 245 are parallelly arranged.

[0063] In practical applications, the monitoring device 24 is used to monitor whether corrosion cracks occur in the C-ring sample 7 during the test. A scale is set inside the objective lens end 242. When cracks occur in the sample, the crack length can be measured to record the crack extension. The actual crack length can be calculated as follows: Lcrack-actual=Lsample width-actual*Lcrack-objective lens / Lsample width-objective lens.

[0064] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A corrosion fatigue testing device, characterized in that: The corrosion fatigue testing equipment comprises a support platform, a corrosion device, a sample loading moving device, a fatigue loading device, a control box and a clamping device, wherein the corrosion device comprises a corrosion box, a liquid replenishing box, a waste liquid box and a monitoring device; the sample loading moving device and the fatigue loading device fixedly arranged on the upper side of the sample loading moving device are both arranged in the control box and can move horizontally along the length direction of the support platform; the clamping device comprises a stand, a balance bar and two support bars; the corrosion box is arranged on the table top of the support platform, the clamping device is arranged on one side of the corrosion box and passes through the corrosion box to be connected with the fatigue loading device arranged on the other side of the corrosion box; the sample loading moving device consists of a first base, a guide rail groove, a mobile box, a first screw rod, a first wire rod The invention comprises a rod frame, a first controller, a first motor, a first gearbox, a first power gear, a first transmission gear and a first limiter, wherein two guide rail grooves are symmetrically arranged on both sides of the first base parallel to the length direction of the support platform, and the first screw rod is arranged above the first base parallel to the guide rail groove and is axially fixed by the first screw rod frame; the bottom of the mobile box body can be movably assembled in the guide rail groove of the first base, the first controller, the first motor and the first gearbox are fixedly arranged in the mobile box body and move synchronously with the mobile box body, the first controller is electrically connected to the first motor, the first motor is connected to the first gearbox gear, the first power gear is arranged on the outside of the mobile box body and is fixedly connected to the first gearbox, and the first The transmission gear is coaxially assembled on the outside of the first screw rod and engaged in the first limit slot of the first limiter fixedly arranged on the outside of the moving box body, the inner side of the first transmission gear is meshed with the first screw rod, and the outer side of the first transmission gear is meshed with the first power gear; a plurality of first fixing holes are evenly distributed on the top of the moving box body; the fatigue loading device is composed of a second base, a second screw rod, a second screw rod frame, a second controller, a second motor, a second gearbox, a second power gear, a second transmission gear, and a second limiter, wherein the second screw rod is arranged above the second base parallel to the guide rail groove and movably assembled on the second screw rod frame, and a first assembly groove is arranged at one end of the second screw rod; the second controller, The second motor and the second gearbox are fixedly arranged on the second base and move synchronously with the second base. The second controller is electrically connected to the second motor, the second motor is connected to the second gearbox gear, the second power gear is fixedly connected to the second gearbox, the second transmission gear is coaxially assembled on the outside of the second screw rod and engaged in the second limit slot of the second limiter fixedly arranged on the second base, the inner side of the second transmission gear is meshed with the second screw rod, and the outer side of the second transmission gear is meshed with the second power gear. A plurality of second fixing holes respectively matching the first fixing holes are distributed on the second base, and the second base is assembled on the top of the mobile box and fastened to the second fixing hole through the first fixing hole.

2. The corrosion fatigue testing equipment according to claim 1, characterized in that: The stand is fixed on the table on one side of the corrosion box, a connecting rod is fixedly arranged on the inner side surface of the stand, and a second assembly groove is arranged on the outer end of the connecting rod; a third assembly groove is arranged at one end of the support rod, and the outer end surface of the end is composed of symmetrically arranged beveled surfaces and a clamping surface arranged between the two beveled surfaces, and an axial protrusion is arranged at the other end of the support rod; the axial protrusion of the support rod is respectively matched with the second assembly groove of the connecting rod and the first assembly groove at one end of the second screw rod, and the two ends of the balance rod are respectively assembled in the third assembly groove of the symmetrically arranged support rod.

3. The corrosion fatigue testing equipment according to claim 1, characterized in that: Circular through holes are arranged on the box bodies on both sides of the corrosion box, rubber soft rings are arranged on the inner walls of the circular through holes, and the support rods are coaxially assembled on the inner sides of the rubber soft rings of the circular through holes.

4. The corrosion fatigue testing equipment according to claim 1, characterized in that: A liquid inlet is arranged on one side of the corrosion box, and a liquid inlet pipe is vertically arranged on the inner side of the corrosion box and connected with the liquid inlet; a liquid discharge port is arranged at the bottom of the corrosion box, and a liquid discharge valve is arranged on the liquid discharge port; the liquid inlet of the corrosion box is connected with a liquid replenishment port at the lower part of one side of the liquid replenishment box fixedly arranged on the top of the control box through a liquid replenishment pipe, and a liquid replenishment valve is arranged on the liquid replenishment port; the liquid discharge port of the corrosion box is connected with a waste liquid tank fixedly arranged under the support platform through a liquid discharge pipe.

5. The corrosion fatigue testing equipment according to claim 4, characterized in that: The corrosion box, liquid inlet pipe, liquid discharge valve and liquid replenishment valve are made of tempered glass.

6. The corrosion fatigue testing equipment according to claim 1, characterized in that: The monitoring device includes a monitoring cylinder, an objective lens end, a first mirror, a second mirror, a third mirror and an eyepiece end. The monitoring cylinder is in a broken line shape as a whole. The objective lens end is arranged at the bottom end of the monitoring cylinder, and the eyepiece end is arranged at the top end of the monitoring cylinder, wherein the objective lens end is vertically arranged directly below the center of the balance bar in the clamping device, and the axis of the eyepiece end is parallel to the horizontal plane; the first mirror, the second mirror and the third mirror are respectively inclinedly arranged at the bottom end, the angle end and the top end of the monitoring cylinder, wherein the first mirror and the second mirror are symmetrically arranged, and the second mirror and the third mirror are parallelly arranged.

7. The corrosion fatigue testing equipment according to claim 1, characterized in that: A liquid crystal control panel is provided on the control box, which is used to control the sample loading moving device and the fatigue loading device by setting the moving distance, loading stress size, stress cycle rate and cycle time, and is also used to display the current operating status parameters of the equipment.

8. The corrosion fatigue testing equipment according to claim 1, characterized in that: The balance rod and support rod are made of high-strength corrosion-resistant alloy material.

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