Bar-shaped corrosion test specimen molding device

Abstract

The utility model belongs to corrosion sample processing technical field, concretely relates to a bar corrosion sample forming device. Bar corrosion sample forming device, the positioning pile, the positioning plate be located in sealed box, the forming die is fixed on the positioning pile and the positioning plate outside the bar sample and is covered, and vacuum system is connected with sealed box, is provided with vacuum gauge on the connecting pipeline. Bar corrosion sample forming device of the utility model, sectional type detachable mould is convenient for assembling and splitting, and the positioning pile, the positioning plate and the replaceable silica gel bushing can be adapted to various specifications bar sample, and the universality is strong, and the cost is low, the positioning structure guarantees that bar sample is placed vertically, and the scale line and the overflow hole ensure coating accuracy, improve sample quality, vacuum system reduces coating bubble, strengthens stability, is applicable to high -efficient preparation corrosion sample.

Description

Technical Field

[0001] This utility model belongs to the field of corrosion sample processing technology, specifically relating to a rod-shaped corrosion sample forming device. Background Technology

[0002] In corrosion tests evaluating the corrosion resistance of alloys, the pretreatment of the specimens is crucial, especially the epoxy resin coating of bar specimens, which directly affects the accuracy and reliability of the test results. For specimens such as the lead bars of tubular positive plate grids and machined cylindrical specimens, their structural characteristics dictate the special nature of the coating operation—a uniform and complete epoxy resin protective layer needs to be formed on the surface of the bar to isolate non-test areas from the corrosive environment, ensuring that the test only affects the predetermined test area.

[0003] However, current conventional epoxy resin coating operations face numerous challenges. Epoxy resin itself has strong fluidity, making it prone to sagging during coating. To avoid this problem, operators must hold the rod and rotate it continuously 360°, requiring constant monitoring throughout the coating and initial curing stages. This not only demands extremely high operator skill and endurance, but maintaining the same action for extended periods can also lead to operator fatigue, affecting the uniformity of the coating. Even with constant focus, it's difficult to guarantee a completely consistent coating thickness, often resulting in areas that are too thick or too thin. Even momentary operational errors can cause coating defects. If such samples proceed to corrosion testing, the damaged protective layer may distort the test data, affecting the accurate assessment of the alloy's corrosion resistance.

[0004] This manual operation method not only greatly increases the difficulty and labor intensity of the operators, but also poses the risk of unstable coating quality. Therefore, it is particularly urgent to develop a mold that can realize the one-piece molding of epoxy resin encapsulation of rods.

[0005] CN219664187U discloses an epoxy resin coating device for rebar surfaces, including a chassis, gearbox, drive shaft, fixing mechanism, power mechanism, and moving mechanism. This device can quickly and evenly coat the surface of rebar with epoxy resin through the coordinated operation of these mechanisms. It can also be dried during coating, reducing labor intensity and increasing efficiency. Furthermore, it provides a limit at one end of the rebar to prevent it from swinging during rotation, enhancing safety. This device automates the epoxy resin coating process on rebar surfaces, achieving uniform and rapid coating with a drying function, thus improving work efficiency and safety. However, this device is suitable for epoxy resin coating of large-size products, but suffers from insufficient adaptability and high cost for small-size products. Utility Model Content

[0006] To overcome the problems of cumbersome and costly epoxy resin coating of rod-shaped samples in the existing technology, this utility model provides a rod-shaped corrosion sample forming device.

[0007] The rod-shaped corrosion sample forming device of this utility model includes a positioning pile, a positioning plate, a forming mold, and a vacuum system. The positioning pile and the positioning plate are located inside a sealed box. The forming mold is sleeved on the outside of the rod-shaped sample and fixed to the positioning pile and the positioning plate. The vacuum system is connected to the sealed box, and a vacuum gauge is installed on the connecting pipeline.

[0008] Preferably, the positioning stake is located at the bottom of the sealed box, and the positioning stake is provided with a positioning hole. A positioning plug is installed at the positioning hole. The positioning hole can be provided with different diameters and shapes, and the positioning plug is adapted to the positioning hole.

[0009] Preferably, the positioning plate is detachably fixed in the middle of the sealed box, and the position and parameters of the positioning holes on the positioning plate are consistent with those of the positioning pile, ensuring that the rod-shaped sample can be placed vertically inside the sealed box.

[0010] Preferably, the molding die includes a mold cavity body and a positioning ring. The mold cavity body is made of polytetrafluoroethylene and adopts a segmented, detachable structure, consisting of an upper tube, a middle tube, and a lower tube. The lower end face of the upper tube has a circumferentially formed an annular groove, and the upper end face of the middle tube has a corresponding annular protrusion. The structure of the lower end face of the middle tube is consistent with that of the lower end face of the upper tube (i.e., it also has an annular groove), and the structure of the upper end face of the lower tube is consistent with that of the upper end face of the middle tube (i.e., it has an annular protrusion). Furthermore, the annular protrusion matches the annular groove. The middle tube can be increased or decreased according to the actual epoxy resin coating height.

[0011] Preferably, an annular groove is pre-set on the inner wall of the lower section tube to embed a silicone bushing. Furthermore, when the diameter of the rod-shaped sample is different, the inner diameter of the mold cavity can be quickly adjusted by replacing the silicone bushing of different thicknesses to accommodate rod-shaped samples of different diameters.

[0012] Preferably, the positioning ring is located inside the upper section of the tube. The positioning ring has a double-ring structure, consisting of an outer ring, an inner ring, and a connecting rib. The outer diameter of the outer ring matches the inner diameter of the mold cavity, the inner ring is made of rubber, and the connecting rib has a hollow structure. Furthermore, the inner diameter of the inner ring matches the outer diameter of the rod-shaped sample and is smaller than the outer diameter of the rod-shaped sample. The rubber material of the inner ring is elastic, which can ensure that the rod-shaped sample is firmly fixed in the center position. The hollow structure is used for injecting epoxy resin.

[0013] Preferably, the outer wall of the upper section of the pipe is provided with a reaction zone scale line, and an overflow hole is provided at the reaction zone scale line. Furthermore, the overflow hole is used to overflow excess epoxy resin to prevent it from affecting the length of the reaction zone. The reaction zone scale line is located at the lower part of the positioning ring.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] The rod-shaped corrosion sample forming device of this utility model features a segmented, detachable mold for easy assembly and disassembly, a double-ring structure with positioning rings and hollow connecting ribs to simplify the operation process; positioning posts, positioning plates, and replaceable silicone bushings can accommodate rod-shaped samples of various specifications, offering strong versatility; the positioning structure ensures the vertical placement of the rod-shaped sample, while the scale lines and overflow holes ensure coating accuracy and improve sample quality; the forming mold is reusable, reducing costs, and the vacuum system reduces coating bubbles and enhances stability, making it suitable for the efficient preparation of corrosion samples. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the rod-shaped corrosion sample forming device of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the sealing box of this utility model;

[0018] Figure 3 This is a cross-sectional view of the middle section of the pipe of this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the molding die of this utility model when it is fitted onto the rod-shaped sample;

[0020] Figure 5 This is a schematic diagram of the positioning ring structure of this utility model.

[0021] In the diagram: 1. Positioning stake; 2. Positioning plate; 3. Molding mold; 4. Vacuum system; 5. Sealing box; 6. Rod-shaped sample; 7. Vacuum gauge; 8. Positioning hole; 9. Positioning plug; 301. Mold cavity body; 302. Positioning ring; 3021. Outer ring; 3022. Inner ring; 3023. Connecting rib; 303. Upper section pipe; 304. Middle section pipe; 305. Lower section pipe; 3051. Annular groove; 3052. Silicone bushing; 306. Annular groove; 307. Annular protrusion; 308. Reaction zone scale line; 309. Overflow hole. Detailed Implementation

[0022] The specific technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0023] like Figures 1-5 As shown, the rod-shaped corrosion sample forming device includes a positioning pile 1, a positioning plate 2, a forming mold 3, and a vacuum system 4. The positioning pile 1 and the positioning plate 2 are located inside the sealed box 5. The forming mold 3 is sleeved on the outside of the rod-shaped sample 6 and fixed on the positioning pile 1 and the positioning plate 2. The vacuum system 4 is connected to the sealed box 5, and a vacuum gauge 7 is installed on the connecting pipeline. The positioning plate 2 is detachably fixed in the middle of the sealed box 5.

[0024] Both the positioning pile 1 and the positioning plate 2 are provided with positioning holes 8, and positioning plugs 9 are installed at the positioning holes 8. The position and parameters of the positioning holes 8 on the positioning plate 2 are the same as those of the positioning holes 8 on the positioning pile 1.

[0025] The molding die 3 includes a mold cavity body 301 and a positioning ring 302. The mold cavity body 301 adopts a segmented and detachable structure, consisting of an upper tube 303, a middle tube 304, and a lower tube 305.

[0026] A ring-shaped groove 306 is formed around the lower end face of the upper section pipe 303, and a ring-shaped protrusion 307 is formed at the corresponding position on the upper end face of the middle section pipe 304. The structure of the lower end face of the middle section pipe 304 is the same as that of the lower end face of the upper section pipe 303, and the structure of the upper end face of the lower section pipe 305 is the same as that of the upper end face of the middle section pipe 304.

[0027] The inner wall of the lower section pipe 305 has a pre-set annular groove 3051, into which a silicone bushing 3052 is embedded.

[0028] The upper section pipe 303 is provided with a positioning ring 302. The positioning ring 302 is a double ring structure, consisting of an outer ring 3021, an inner ring 3022 and a connecting rib 3023. The outer diameter of the outer ring 3021 matches the inner diameter of the mold cavity body 301. The inner ring 3022 is made of rubber, and the connecting rib 3023 is a hollow structure. The outer wall of the upper section pipe 303 is provided with a reaction zone scale line 308, and an overflow hole 309 is provided at the reaction zone scale line 308.

[0029] Example

[0030] The corrosion test uses a cylindrical rod-shaped specimen with a total length of 150 mm, a reaction zone length of 30 mm, an epoxy resin coating zone length of 80 mm, a fixed end length of 40 mm, a rod-shaped specimen diameter of 3.0 mm, a molding die inner diameter of 8.0 mm, an inner and outer diameter of the inner ring 3022 of the upper positioning ring 302 being 2.8 mm and 4.5 mm respectively, and an inner and outer diameter of the outer ring 3021 being 6.5 mm and 8.2 mm respectively.

[0031] like Figures 1-5 As shown, the specific steps for using the rod-shaped corrosion sample forming device are as follows:

[0032] (1) Define the boundary between the reaction zone and the non-reaction zone of the rod-shaped sample 6;

[0033] (2) Embed the silicone bushing 3052 into the annular groove 3051 of the lower tube 305, put the rod-shaped sample 6 into the mold cavity body 301, adjust the position of the rod-shaped sample 6 and the mold cavity body 301, install the upper positioning ring 302 so that the rod-shaped sample 6 is centered, and the scale line 308 of the reaction zone of the upper tube 303 and the scale line marked on the rod-shaped sample 6 are on the same horizontal plane.

[0034] (3) Insert the rod-shaped sample 6 into the positioning pile 1 and positioning plate 2 with positioning plug 9, and adjust its position so that it is perpendicular to the positioning pile 1;

[0035] (4) The mold cavity body 301 is 10mm higher than the boundary line of the reaction zone, and the upper positioning ring 302 is placed 8mm above the scale line 308 of the reaction zone.

[0036] (5) Add the prepared epoxy resin into the mold cavity body 301. Add half of it first, turn on the vacuum system 4, the vacuum degree is -0.095 to -0.1MPa, and the time is 10min. After slowly releasing the pressure, inject the other half of the epoxy resin, control the liquid level at the reaction zone scale line 308, and then turn on the vacuum.

[0037] (6) After standing for 24 hours, rotate the mold cavity body 301 to remove the rod-shaped sample 6 and obtain the molded sample for corrosion test. If the mold cavity body 301 sticks after long-term use, a thin layer of release agent can be applied to the inner wall of the mold cavity body 301 before use to ensure rapid demolding.

Claims

1. A rod-shaped corrosion sample forming device, characterized in that, The device includes a positioning pile (1), a positioning plate (2), a forming mold (3), and a vacuum system (4). The positioning pile (1) and the positioning plate (2) are located inside a sealed box (5). The forming mold (3) is fitted onto the outside of the rod-shaped sample (6) and fixed to the positioning pile (1) and the positioning plate (2). The vacuum system (4) is connected to the sealed box (5).

2. The rod-shaped corrosion sample forming device according to claim 1, characterized in that, The positioning plate (2) can be detachably fixed in the middle of the sealed box (5).

3. The rod-shaped corrosion sample forming apparatus according to claim 1 or 2, characterized in that, Both the positioning pile (1) and the positioning plate (2) are provided with positioning holes (8), and positioning plugs (9) are installed at the positioning holes (8). The position and parameters of the positioning holes (8) on the positioning plate (2) are consistent with those of the positioning holes (8) on the positioning pile (1).

4. The rod-shaped corrosion sample forming device according to claim 1, characterized in that, The molding die (3) includes a mold cavity body (301) and a positioning ring (302). The mold cavity body (301) adopts a segmented detachable structure and is composed of an upper tube (303), a middle tube (304), and a lower tube (305).

5. The rod-shaped corrosion sample forming device according to claim 4, characterized in that, A ring groove (306) is formed around the lower end face of the upper section pipe (303), and a ring protrusion (307) is formed at the corresponding position on the upper end face of the middle section pipe (304). The structure of the lower end face of the middle section pipe (304) is the same as that of the lower end face of the upper section pipe (303), and the structure of the upper end face of the lower section pipe (305) is the same as that of the upper end face of the middle section pipe (304).

6. The rod-shaped corrosion sample forming device according to claim 4, characterized in that, The inner wall of the lower section pipe (305) has a pre-set annular groove (3051) for inserting a silicone bushing (3052).

7. The rod-shaped corrosion sample forming device according to claim 4, characterized in that, A positioning ring (302) is provided inside the upper section pipe (303), and a reaction zone scale line (308) is provided on the outer wall of the upper section pipe (303). An overflow hole (309) is provided at the reaction zone scale line (308).

8. The rod-shaped corrosion sample forming apparatus according to claim 7, characterized in that, The positioning ring (302) has a double-ring structure, consisting of an outer ring (3021), an inner ring (3022), and a connecting rib (3023).

9. The rod-shaped corrosion sample forming apparatus according to claim 8, characterized in that, The outer diameter of the outer ring (3021) matches the inner diameter of the mold cavity body (301), the inner ring (3022) is made of rubber, and the connecting rib (3023) is a hollow structure.

10. The rod-shaped corrosion sample forming apparatus according to claim 1, characterized in that, A vacuum gauge (7) is installed on the pipeline connecting the vacuum system (4) and the sealed box (5).

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