Testing device for bolt corrosion fatigue test
By designing the moving clamping part, fixed clamping part and test chamber in the corrosion fatigue test device, the adapter and rubber spacer reduce leakage of corrosion liquid, the corrosion problem of corrosion liquid on the test equipment is solved, and the durability and environmental protection of the equipment are achieved.
Patent Information
- Application Number
- CN202421763072.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-23
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-07-23
AI Technical Summary
During the test process of the existing corrosion fatigue test device, the floating of the corrosion liquid causes corrosion to the test equipment and affects the service life of the equipment.
A test device including a test bench, a moving clamping part, a fixed clamping part, a test chamber and a corrosion liquid tank are designed. The bolts to be inspected are clamped on the chuck through the first adapter and the second adapter, the bolts are driven by the motor, and the corrosion liquid is sprayed through the spray head, a rubber spacer and a shield are provided to reduce the leakage of the corrosion liquid, and the liquid temperature is adjusted using a pipeline heater.
It effectively avoids the unorganized emission of the corrosion liquid, reduces corrosion on the test device, reduces the impact on the surrounding environment, maintains the temperature consistency of the corrosion liquid, and extends the service life of the equipment.
Smart Images
Figure CN223091732U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a test device for bolt corrosion fatigue test. Background Art
[0002] During the application process of engineering structures in the fields of aviation, shipbuilding, petroleum, and civil engineering, etc., they inevitably bear alternating stresses and are exposed to harmful corrosion environments. The coupling of corrosion and cyclic loads will lead to the occurrence of corrosion fatigue, often causing serious accidents.
[0003] Since corrosion fatigue is greatly affected by the test environment, when studying the corrosion fatigue performance of components, the consistency of test materials and test processes should be controlled as much as possible. In existing corrosion fatigue tests, basically, when fatigue tests are carried out on specimens, corrosive liquids are sprayed on the specimens at the same time. However, due to the dispersion of corrosive liquids, it is easy to cause corrosion to test equipment and affect the service life of test equipment. Content of the Utility Model
[0004] To reduce the corrosion effect of corrosive liquids on test equipment during corrosion fatigue tests, this application proposes a test device for bolt corrosion fatigue tests, which includes a test bench, a moving clamping part, a test chamber, and a fixed clamping part that are installed on the test bench at intervals along the first axis direction. The moving clamping part is slidably installed on the test bench and can reciprocate along the first axis direction. The fixed clamping part is fixedly installed on the test bench. The moving clamping part includes a first seat body slidably installed on the test bench and a first chuck rotatably installed on the first seat body. The first seat body is installed on a slide plate through an elastic member, and a counterweight rod is installed on the lower side of the first seat body, and several weights are movably placed on the counterweight rod; the fixed clamping part has a second chuck and a motor for driving the second chuck to rotate, and the first chuck and the second chuck are arranged opposite to each other;
[0005] The test device further includes a first adapter and a second adapter. The first adapter includes a first rod and a first joint formed at one end of the first rod. The second adapter includes a second rod and a second joint formed at one end of the second rod. The first rod freely passes through a first box hole on the test chamber and is clamped on the first chuck; the second rod freely passes through a second box hole on the test chamber and is clamped on the second chuck; both the first joint and the second joint are located in the inner cavity of the test chamber; both ends of the bolt to be inspected can be detachably installed on the first joint and the second joint respectively; the inner diameter of the first box hole is larger than the outer diameter of the first rod, the inner diameter of the second box hole is larger than the outer diameter of the second rod, and the first rod can freely swing in the first box hole, and the second rod can freely swing in the second box hole;
[0006] The test chamber is detachably installed on the test bench. A chamber cover is hinged to the top of the test chamber, and a spray head is installed on the chamber cover. A sewage pipe is installed on the bottom plate of the test chamber.
[0007] The test device further includes a corrosion liquid tank, which is connected to the spray head through a discharge pipe, and a water pump and a pipeline heater are installed on the discharge pipe.
[0008] When this application is in operation, first, the first adapter and the second adapter are respectively clamped on the first chuck and the second chuck through the first box hole and the second box hole inside the test chamber. Then, both ends of the bolt to be inspected are respectively installed on the first joint and the second joint, and weights are configured as needed to generate a bending moment on the bolt to be inspected. Then, the corrosion liquid is sprayed into the test area through the spray head, and the motor is used to drive the bolt to be inspected to rotate for the corrosion fatigue test. Since a special test chamber is provided in this application, it can effectively avoid the unorganized discharge of the corrosion liquid, reduce the corrosion of the test device, and the impact on the surrounding environment. The first adapter and the second adapter are used to prevent the first chuck and the second chuck from entering the test chamber to reduce the corrosion of the first chuck and the second chuck by the corrosion liquid, and the first adapter and the second adapter are used as consumable parts. The pipeline heater is used to adjust the temperature of the corrosion liquid so that the corrosion liquid reaches the set temperature.
[0009] Further, to reduce the leakage amount of the corrosion liquid outwards through the first box hole and the second box hole, a first rubber isolation member is tightly sleeved on the first adapter, and the first rubber isolation member presses against the inner wall of the test chamber on the side facing the moving clamping part; a second rubber isolation member is tightly sleeved on the second adapter, and the second rubber isolation member presses against the inner wall of the test chamber on the side facing the fixed clamping part.
[0010] To further reduce the leakage amount of the corrosion liquid outwards, a first shielding cover is installed on the top of the first rubber isolation member, and the top of the first rubber isolation member is inserted into the first shielding cover; a second shielding cover is installed on the top of the second rubber isolation member, and the top of the second rubber isolation member is inserted into the second shielding cover.
[0011] Specifically, the first joint has an internal threaded hole with an opening facing the fixed clamping part, and the second joint has an internal polygonal hole with an opening facing the moving clamping part; or, the first joint has an internal polygonal hole with an opening facing the fixed clamping part, and the second joint has an internal threaded hole with an opening facing the moving clamping part; the shape of the internal polygonal hole is the same as the outer peripheral surface shape of the bolt head of the bolt to be inspected; the bolt head of the bolt to be inspected can be tightly inserted into the internal polygonal hole joint, and the screw rod of the bolt to be inspected can be screwed into the internal threaded hole. This design can conveniently and quickly connect both ends of the bolt to be inspected to the first joint and the second joint, and avoid damaging the bolt to be inspected, especially can maintain the integrity of the threads of the bolt to be inspected.
[0012] Further, in order to stably connect the bolt to be inspected in the inner polygonal hole, a set screw is screwed on the inner polygonal hole joint, and the set screw can tightly press against the bolt head of the bolt to be inspected.
[0013] Further, in order to maintain the stability of the moving clamping part, the elastic member is a helical compression spring, and two helical compression springs are provided. The two helical compression springs are symmetrically arranged with respect to the central axis of the first chuck.
[0014] Further, in order to prevent the helical compression spring from tilting and causing the moving clamping part to deviate from the set position, a limiting rod is provided corresponding to each helical compression spring. One end of the limiting rod is fixedly installed on the sliding plate, and the other end of the limiting rod is a free end; when the helical compression spring is in a free state, there is a distance between the free end of the limiting rod and the first seat body; the helical compression spring is freely sleeved on the corresponding limiting rod; the two helical compression springs are symmetrically arranged with respect to the counterweight rod.
[0015] Further, in order to ensure the flexibility of the sliding plate, a slide rail extending in the first axis direction is fixedly installed on the test bench. The sliding plate is slidably installed on the slide rail, and a positioning screw is screwed on the sliding plate. The positioning screw can pass through the sliding plate and press against the slide rail to fix the sliding plate on the slide rail. The positioning screw can be used to fix the sliding plate on the test bench.
[0016] Further, in order to facilitate the addition and subtraction of weights, a chute is opened on the test bench in the first axis direction. The lower end of the counterweight rod freely passes through the chute downward and is provided with a weight tray, and weights can be freely placed on the weight tray. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is a schematic structural diagram of an embodiment of the present invention.
[0018] Figure 2 Make Figure 1 The view in the A-A direction in
[0019] Figure 3 is a schematic structural diagram of the test chamber.
[0020] Figure 4 is a schematic structural diagram of the first adapter, the second adapter and the bolt to be inspected. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] Refer to Figures 1-4 , in the drawings, the extending direction of the first axis X is the first axis direction, the extending direction of the second axis Y is the second axis direction, and both the first axis direction and the second axis direction extend horizontally and are perpendicular to each other. The test device for bolt corrosion fatigue test will be described in detail below.
[0022] The test device for bolt corrosion fatigue test includes a test bench 10 and a dynamic clamping part 30, a test box 60 and a fixed clamping part 20 installed on the test bench 10 at intervals along a first axial direction. The test bench 10 includes a table panel 11 and legs 12 supporting the table panel 11.
[0023] The dynamic clamping part 30 includes a first seat body 33, a first axial hole is arranged in the first seat body along the first axis direction, a first hole shoulder 331 is arranged in the first axial hole, the first hollow shaft 31 is rotatably mounted in the first axial hole via a pair of first angular contact bearings 32, and the central axis of the first hollow shaft extends along the first axis direction. A first shaft shoulder 311 is arranged on the first hollow shaft, and the first shaft shoulder 311 divides the first hollow shaft 31 into a first mounting section 312 and a first clamping section 313. The first shaft shoulder 311 is located on the side of the first hole shoulder facing the fixed clamping part, and the first mounting section 312 is rotatably mounted in the first axial hole via the first angular contact bearing 32, one of the first angular contact bearings is located between the first hole shoulder and the first shaft shoulder, and the other first angular contact bearing is located on the other side of the first hole shoulder. The first screw 35 mounts the first bearing cover 34 on the side of the first seat body away from the fixed clamping part, and the pair of first angular contact bearings 32 are retained in the first axial hole. The first clamping section 313 extends out of the first axial hole toward the fixed clamping portion 20, and the first chuck 36 is fixedly mounted at the end of the first clamping section. In this embodiment, the first chuck 36 is specifically a three-jaw chuck.
[0024] Two slide rails 13 are fixedly mounted on the table panel. The two slide rails 13 extend along the first axis and are parallel to each other. The slide plate 14 is slidably mounted on the two slide rails so that the slide plate can reciprocate along the first axis. A positioning screw hole is provided on the slide plate. The positioning screw hole passes through the slide plate in the vertical direction. A positioning screw 141 is screwed into the positioning screw hole. The positioning screw can pass through the slide plate and press against the slide rail to fix the slide plate on the slide rail.
[0025] Two helical compression springs 37 are mounted on the slide in the vertical direction. The two helical compression springs are symmetrically arranged relative to the central axis of the first chuck. The two helical compression springs extend in the vertical direction, and the first seat body 33 is fixedly mounted on the upper ends of the two helical compression springs. The two helical compression springs are formed into an elastic member together, that is, the first seat body is mounted on the slide via the elastic member.
[0026] Corresponding to each helical compression spring 37, a limiting rod 38 extending in the vertical direction is provided, and the helical compression spring is freely sleeved on the corresponding limiting rod. The lower end of the limiting rod 38 is fixed on the slide plate, and the upper end of the limiting rod is a free end. When the helical compression spring is in a free state, there is a distance between the free end of the limiting rod and the first seat body.
[0027] A chute 111 is formed on the table board along the first axis direction. The counterweight rod 39 extends in the vertical direction. The upper end of the counterweight rod is fixedly installed on the lower side of the first seat body. The lower end of the counterweight rod freely passes through the chute 111 downward and is provided with a weight tray 392. Weights 393 can be freely placed on the weight tray 392. Two helical compression springs are symmetrically arranged with respect to the counterweight rod.
[0028] The fixed clamping part 20 includes a second seat body 23 fixed on the table board. A second shaft hole is arranged on the second seat body 23 along the first axis direction. A second hole shoulder 231 is arranged in the second shaft hole. The second hollow shaft 21 is rotatably installed in the second shaft hole through a pair of second angular contact bearings 22. The central axis of the second hollow shaft extends along the first axis direction.
[0029] A second shaft shoulder 211 is arranged on the second hollow shaft. The second shaft shoulder 211 divides the second hollow shaft 21 into a second installation section 213 and a driving section 212. The second shaft shoulder 211 is located on the side of the second hole shoulder away from the movable clamping part. The second installation section 213 is rotatably installed in the second shaft hole through the above-mentioned second angular contact bearings 22. One of the second angular contact bearings is located between the second hole shoulder and the second shaft shoulder, and the other second angular contact bearing is located on the other side of the second hole shoulder. The second screw 25 installs the second bearing cover 24 on the side of the second seat body facing the movable clamping part, and holds the pair of second angular contact bearings 22 in the second shaft hole. The second installation section 213 extends out of the second shaft hole towards the movable clamping part 30, and the second chuck 26 is fixedly installed at the end of the second installation section 213. In this embodiment, the second chuck 26 is specifically a three-jaw chuck.
[0030] The motor 29 is fixedly installed on the table board. The driving section 212 is formed as a connecting shaft, and the main shaft of the motor 29 is connected to the driving section 212 of the second hollow shaft. The motor is used to drive the second hollow shaft to rotate. An encoder is installed on the main shaft of the motor to record the number of rotations of the main shaft, and this number of rotations is the number of rotations of the bolt to be detected.
[0031] The test chamber 60 is made of 316L stainless steel material. It includes a bottom plate 62, a box body 61 welded to the bottom plate 62, and a top plate 63 hinged to the top of the box body 61. The top plate also forms a box cover, and a spray head 66 is installed on the box cover. A sewage discharge pipe 64 is installed on the bottom plate 62, and a sewage discharge valve 65 is installed on the sewage discharge pipe. Legs 69 are welded to the lower side of the bottom plate, and the legs are detachably installed on the test bench through bolts.
[0032] A first box body hole 671 is formed on the side of the box body 61 facing the movable clamping part 30, and a second box body hole 672 is formed on the side of the box body 61 facing the fixed and movable clamping part 20.
[0033] The first adapter 40 includes a first rod 41 and a first joint 42 integrally formed on the first rod. The first joint is located at one end of the first rod, and the other end of the first rod freely passes through the first box hole 671 and is clamped on the first chuck 36. The second adapter 50 includes a second rod 51 and a second joint 52 integrally formed on the second rod. The second joint is located at one end of the second rod, and the other end of the second rod freely passes through the second box hole 672 and is clamped on the second chuck 26. Both the first joint and the second joint are located in the inner cavity of the test chamber. Both ends of the bolt 90 to be inspected can be detachably installed on the first joint and the second joint respectively. The inner diameter of the first box hole is greater than the outer diameter of the first rod, and the inner diameter of the second box hole is greater than the outer diameter of the second rod. Moreover, the first rod can swing freely within the first box hole, and the second rod can swing freely within the second box hole.
[0034] Specifically in this embodiment, the first joint 42 has an internal threaded hole 43 with an opening facing the fixed clamping portion, and the second joint 52 has an internal polygonal hole 53 with an opening facing the moving clamping portion. The shape of the internal polygonal hole is the same as the outer peripheral surface of the bolt head 91 of the bolt 90 to be inspected. The bolt head 91 of the bolt 90 to be inspected can be closely inserted into the internal polygonal hole joint, and the screw rod 92 of the bolt 90 to be inspected can be screwed into the internal threaded hole. To stably hold the bolt 90 to be inspected on the second joint, in this embodiment, a locking threaded hole 55 is radially formed in the second joint. The locking threaded hole 55 penetrates the hole wall of the locking threaded hole. A set screw 56 is screwed into the locking threaded hole 55 and tightly presses against the bolt head 91 of the bolt 90 to be inspected. In this embodiment, the bolt head 91 of the bolt 90 to be inspected is a regular hexagon, so the internal polygonal hole is also a regular hexagon hole.
[0035] It can be understood that in another embodiment, the internal polygonal hole can also be arranged on the first joint, and the internal threaded hole can be arranged on the second joint.
[0036] To prevent the corrosive liquid in the test chamber from diffusing outward through the first box hole 671 and the second box hole 672 and causing pollution, in this embodiment, a first rubber isolation member 44 is tightly sleeved on the first adapter. The first rubber isolation member presses against the inner wall of the test chamber on the side facing the moving clamping portion; a second rubber isolation member 54 is tightly sleeved on the second adapter. The second rubber isolation member presses against the inner wall of the test chamber on the side facing the fixed clamping portion. And a first shielding cover 681 is installed on the top of the first rubber isolation member, and the top of the first rubber isolation member is inserted into the first shielding cover; a second shielding cover 682 is installed on the top of the second rubber isolation member, and the top of the second rubber isolation member is inserted into the second shielding cover. Both the first shielding cover and the second shielding cover are semi-circular.
[0037] The etching solution tank 71 is arranged on the ground. The liquid outlet at the bottom of the etching solution tank is connected to the spray head 66 through the discharge pipe 76. Two cut-off valves 73 are installed on the discharge pipe 76. A water pump 74 and a pipeline heater 72 are installed between the two cut-off valves 73. The pipeline heater is located on the side of the water pump facing the spray head, and a thermometer 75 is installed on the side of the pipeline heater facing the spray head. A feed port 77 is installed at the top of the etching solution tank, and a stirrer 78 is installed in the etching solution tank.
[0038] When this embodiment works, first, the first rubber spacer 44 is sleeved on the first rod 41, and then the first rod is passed through the first box body hole 671 and clamped on the first chuck 36, and the upper end of the first rubber spacer 44 is inserted into the first shielding cover 681. Then, the second rubber spacer 54 is sleeved on the second rod 51, and the second rod is passed through the second box body hole 672 and clamped on the second chuck 26, and the upper end of the second rubber spacer 54 is inserted into the second shielding cover 682. Both the first rubber spacer and the second rubber spacer are attached to the inner wall of the box body. Adjust the position of the moving clamping part so that the distance between the first adapter 40 and the second adapter 50 is slightly greater than the length of the bolt to be inspected. Then, first, screw the screw rod of the bolt to be inspected into the internal thread hole 43, and then move the moving clamping part to insert the bolt head of the bolt to be inspected into the internal polygonal hole 53. Tighten the set screw 56, then adjust the weight of the weight 393 on the weight tray 392, close the box cover, connect the discharge pipe 76 to the spray head, and finally start the motor and the water pump 74 for inspection. After the liquid in the test chamber is discharged through the sewage pipe, it is subjected to harmless treatment. The rotation direction of the motor is the same as the screwing direction when the bolt to be inspected is screwed into the internal thread hole.
Claims
1. An experimental device for bolt corrosion fatigue tests, characterized in that, It includes a test bench, a moving clamping part, a test chamber and a fixed clamping part which are installed on the test bench at intervals along the first axis direction. The moving clamping part is slidably installed on the test bench and can reciprocate along the first axis direction. The fixed clamping part is fixedly installed on the test bench. The moving clamping part includes a first seat body slidably installed on the test bench and a first chuck rotatably installed on the first seat body. The first seat body is installed on a slide plate through an elastic member, a counterweight rod is installed on the lower side of the first seat body, and a number of weights are movably placed on the counterweight rod. The fixed clamping part has a second chuck and a motor for driving the second chuck to rotate. The first chuck and the second chuck are arranged oppositely. The test device further includes a first adapter and a second adapter. The first adapter includes a first rod and a first joint formed at one end of the first rod. The second adapter includes a second rod and a second joint formed at one end of the second rod. The first rod freely passes through a first box body hole on the test chamber and is clamped on the first chuck. The second rod freely passes through a second box body hole on the test chamber and is clamped on the second chuck. Both the first joint and the second joint are located in the inner cavity of the test chamber. The two ends of the bolt to be inspected can be respectively detachably installed on the first joint and the second joint. The inner diameter of the first box body hole is larger than the outer diameter of the first rod, and the inner diameter of the second box body hole is larger than the outer diameter of the second rod. And the first rod can freely swing in the first box body hole, and the second rod can freely swing in the second box body hole. The test chamber is detachably installed on the test bench. A box cover is hinged on the top of the test chamber, and a spray head is installed on the box cover. A sewage discharge pipe is installed on the bottom plate of the test chamber. The test device further includes a corrosion liquid tank. The corrosion liquid tank is connected to the spray head through a discharge pipe, and a water pump and a pipeline heater are installed on the discharge pipe.
2. The test device according to claim 1, characterized in that, A first rubber isolation member is tightly sleeved on the first adapter. The first rubber isolation member abuts against the inner wall of the test chamber on the side facing the moving clamping part. A second rubber isolation member is tightly sleeved on the second adapter. The second rubber isolation member abuts against the inner wall of the test chamber on the side facing the fixed clamping part.
3. The test device according to claim 1, characterized in that, A first shielding cover is installed on the top of the first rubber isolation member, and the top of the first rubber isolation member is inserted into the first shielding cover. A second shielding cover is installed on the top of the second rubber isolation member, and the top of the second rubber isolation member is inserted into the second shielding cover.
4. The test device according to claim 1, characterized in that, The first joint has an internal threaded hole with an opening facing the fixed clamping part, and the second joint has an internal polygonal hole with an opening facing the moving clamping part. Or, the first joint has an internal polygonal hole with an opening facing the fixed clamping part, and the second joint has an internal threaded hole with an opening facing the moving clamping part. The shape of the internal polygonal hole is the same as the outer peripheral surface shape of the bolt head of the bolt to be inspected. The bolt head of the bolt to be inspected can be tightly inserted into the internal polygonal hole joint, and the screw rod of the bolt to be inspected can be screwed into the internal threaded hole.
5. The test device according to claim 4, characterized in that, A set screw is screwed on the internal polygonal hole joint, and the set screw can tightly abut against the bolt head of the bolt to be inspected.
6. The test apparatus according to claim 1, characterized in that The elastic member is a helical compression spring, and two helical compression springs are provided. The two helical compression springs are symmetrically arranged with respect to the central axis of the first chuck.
7. The test device according to claim 6, characterized in that, Corresponding to each helical compression spring, a limiting rod is provided. One end of the limiting rod is fixedly installed on the sliding plate, and the other end of the limiting rod is a free end; when the helical compression spring is in a free state, there is a distance between the free end of the limiting rod and the first seat body; the helical compression spring is freely sleeved on the corresponding limiting rod; the two helical compression springs are symmetrically arranged with respect to the counterweight rod.
8. The test device according to claim 1, characterized in that, A slide rail extending in the first axis direction is fixedly installed on the test bench, and the sliding plate is slidably installed on the slide rail. A positioning screw is screwed on the sliding plate, and the positioning screw can pass through the sliding plate and press against the slide rail to fix the sliding plate on the slide rail.
9. The test device according to claim 1, characterized in that, A chute is opened in the test bench in the first axis direction. The lower end of the counterweight rod freely passes through the chute downward and a weight tray is provided, and weights can be freely placed on the weight tray.