Anti-sticking demolding treatment method suitable for model box test

Abstract

The invention belongs to the field of model tests, and particularly relates to an anti-sticking demolding treatment method suitable for a model box test, a model box is treated in a preparation stage before the test and a demolding stage after the test, and the method comprises the following steps: in the preparation stage before the test, the inner surface of the model box is cleaned, and an anti-sticking lining plate is stuck to the inner surface of the model box; a release agent is uniformly sprayed on the inner surface of the anti-sticking lining plate, and a vacuum chuck is arranged at each plate hole; and in the demolding stage after the test, a vacuum pump is started to enable the vacuum suction cup to be tightly attached to the outer side of the model box at the plate hole, gas of the model box and the anti-sticking lining plate is extracted, and the anti-sticking lining plate is tightly attached to the inner surface of the model box. According to the method, all links in the use process of the model box are comprehensively considered, multiple measures are adopted to ensure anti-sticking demolding, deformation or damage of the model box caused by an anti-sticking means with low error-tolerant rate / low success margin is avoided, the repeated utilization rate and durability of the model box are improved to the maximum extent, and a uniform test block is accurately manufactured.

Description

Technical Field

[0001] The invention belongs to the technical field of model tests, and in particular relates to an anti-sticking and demoulding treatment method suitable for model box tests. Background Art

[0002] In many fields of modern scientific research and engineering practice, model tests, as an important research method, play an indispensable role. They can simulate actual working conditions to a certain extent and provide an intuitive and reliable basis for theoretical analysis. In these model tests, fillers such as cement and gypsum often adhere to the model box during the curing process due to their own characteristics. From the practical operation level, the negative effects of this bonding phenomenon are multifaceted. As far as the reuse of the model box is concerned, after each test, if the model box is to be used again, the adhered filler must be removed first. However, traditional cleaning methods are often difficult to completely remove. For example, simple manual shoveling may leave filler debris on the surface of the model box, and chemical cleaning may corrode the model box material due to improper reagent selection. This requires a lot of time to pre-treat the model box before the next test, which seriously affects the continuity and efficiency of the test and increases the manpower and material costs. In terms of durability, the removal process of the adhesive often causes varying degrees of physical damage to the model box. Minor scratches on the surface of the model box will destroy its original smoothness, making it easier for subsequent fillers to adhere; while more serious deformation may affect the structural stability of the model box, resulting in deviations in the test results. Especially in some high-precision model tests, even a slight change in the structure of the model box may make the test data lose its reference value.

[0003] In large-scale special application scenarios, the convenience of demoulding the model box and the reusability of the detachable model plate after demoulding are key factors to ensure efficient project advancement and effective cost control. If only a single demoulding method is used, a series of problems will arise. On the one hand, a single demoulding method may not be able to adapt to the complex structure and special material requirements of the model box, making the demoulding process extremely difficult and consuming a lot of manpower, material resources and time costs. For example, in the demoulding process of some high-precision molds, due to the uneven distribution of demoulding force, local stress concentration may occur on the model box, which in turn causes deformation or even damage to the model box, seriously affecting its subsequent performance.

[0004] On the other hand, when the model box is filled with cement, concrete and other materials with high adhesion, and is subjected to large external loads during the test, the demoulding difficulty will increase significantly. In this case, if a single demoulding method is used, it is very likely to lead to demoulding failure. Once demoulding fails, part of the detachable model plate often has to be replaced to complete the demoulding. Frequent replacement of model plates not only causes waste of materials, but also greatly increases the cost of the project.

[0005] In view of this, in order to ensure that the model test can be carried out smoothly and efficiently, it is crucial to develop a complete solution. The present invention not only proposes an anti-sticking model box, but also proposes a full-process anti-sticking demoulding treatment method, which adopts a variety of measures to ensure anti-sticking demoulding, and avoids the failure of test block processing caused by anti-sticking means with low fault tolerance / low success margin. This method comprehensively considers all aspects of the use of the model box, from the early fine processing to the precise operation of assembly, from the standardized filling during the test process to the scientific maintenance in the later stage. Each step has been carefully designed to effectively solve the problem of filler adhesion, maximize the reuse rate and durability of the model box, and accurately produce uniform test blocks, providing strong guarantees for model test research and practice. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an anti-sticking demoulding treatment method suitable for model box testing, which can solve the adhesion problem of test blocks during demoulding and improve the reuse rate of the model box.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] An anti-sticking demoulding treatment method suitable for a model box test, in which the model box is treated in a preparation stage before the test and a demoulding stage after the test, comprising the following steps:

[0009] Preparatory stage before the test:

[0010] Step 1: The model box includes a bottom plate and a plurality of side plates, wherein the bottom plate and the side plates of the model box are provided with a plurality of plate holes; the inner surface of the model box is cleaned;

[0011] Step 2: bonding an anti-sticking lining plate to the inner surface of the model box; the anti-sticking lining plate completely covers the inner surface of the model box, and the inner surface of the anti-sticking lining plate is flat and smooth;

[0012] Step 3: Evenly spray the release agent on the inner surface of the anti-stick lining plate;

[0013] Step 4: Set a vacuum suction cup at each plate hole so that the vacuum pump is positioned at the plate hole; Demolding stage after the test:

[0014] Step 5: When demoulding, turn on the vacuum pump so that the vacuum suction cup fits tightly to the outside of the model box at the plate hole, extract the gas between the model box and the anti-stick lining plate, and make the anti-stick lining plate fit tightly to the inner surface of the model box.

[0015] Furthermore, a plug which can be inserted into the plate hole is arranged at the center of the vacuum suction cup. When the vacuum suction cup is adsorbed on the plate hole, the plug is inserted into the plate hole and does not contact the anti-sticking lining plate.

[0016] Furthermore, in step 1, the plate holes are at least arranged at the corners, midlines and centers of each bottom plate and side plate; and a sealing ring is filled between the insert and the hole wall of the plate hole.

[0017] Furthermore, a wire groove is provided on the inner surface of the side of the model box, the width of the wire groove is 1.9mm-2.1mm, the depth is 0.9mm-1.1mm, the distance between the wire groove and the corner of the model box is 5cm-7cm, and the distance from the wire groove to the edge of the plate hole is at least 3cm.

[0018] Furthermore, before the cable ducts and holes are opened, modeling software is first used to virtually construct and verify the strength and stress of the model box, plate holes and cable ducts to ensure that the grooving will not have any effect on the overall strength and structural stability of the model box.

[0019] Furthermore, in step 1, before cleaning the inner surface of the model box, first use soft sandpaper to evenly and gently polish and clean the inner surface of the model box in the same direction to thoroughly remove the oil stains, mold release agent residues and fine scratches that may exist on the surface of the plate, while ensuring that the inner surface is flat and smooth;

[0020] After grinding, use a high-pressure gas spray gun to thoroughly and carefully clean the wire troughs, plate holes, and the inner surface of the model box to remove any remaining debris, and wipe the inner surface of the model box with anhydrous ethanol several times to ensure that all impurity particles generated by grinding or originally remaining are completely removed; dry and store the model box in a dust-free environment to keep the surface of the model box clean and flawless.

[0021] Furthermore, in step 2, according to the shape and size of the inner surface of the model box, the anti-stick lining plate corresponding to the bottom plate and side plates of the model box is accurately cut out to ensure that there is no excessive seam after the anti-stick lining plate is attached to the inner surface of the model box, and there is no air residue between the anti-stick lining plate and the inner surface of the model box.

[0022] Furthermore, the anti-sticking lining plate is a smooth rubber plate, a smooth anti-sticking cloth or an anti-sticking paper.

[0023] Furthermore, in step 3, the silicone release agent is evenly sprayed on the inner surface of the model box, and the mold box is left to stand for 40 to 60 minutes after spraying to allow the release agent to fully infiltrate the anti-sticking lining board to form a complete isolation layer.

[0024] Furthermore, the model box is composed of multiple side panels and a bottom plate assembled by a connecting structure; in step 5, after the model test is completed and the demolding conditions are met, the vacuum pump is turned on, and after the vacuum degree is stabilized between -0.08MPa and -0.1MPa for a period of time, the connecting structure is disassembled and the model box is manually removed for demolding; when removing, start from one side of the model box, slowly and evenly apply an outward pulling force to ensure that the pulling force can be evenly distributed on the surface of the model box to avoid excessive force on a single point; during the demolding process, the vacuum degree fluctuation is required not to exceed 0.02MPa. If the vacuum degree fluctuates by more than 0.02MPa or an obvious air leakage sound is heard, the operation should be suspended immediately, the entire system should be fully checked, and the demolding operation should be continued after the problem is repaired.

[0025] The beneficial effects of the present invention are:

[0026] The present invention can effectively solve the adhesion problem of the test block during demoulding and improve the reuse rate of the model box. The model box plate body is carefully cleaned, polished and dried in the early stage to remove impurities, creating favorable conditions for subsequent anti-sticking. In the installation process of the anti-stick lining plate, precise cutting, fitting, fixing and reasonable use of the release agent are combined with a carefully designed vacuum adsorption system to reduce the possibility of adhesion between the adhesive material and the model box from many aspects, significantly reduce adhesion, ensure smooth demoulding of the test block, reduce the possibility of damage to the surface of the model box, and reduce the risk of damage to the test block. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0028] Figure 1 It is a schematic diagram of the top view of the structure of the model box according to an embodiment of the present invention.

[0029] Figure 2 Schematic diagram of the installation of the vacuum suction cup according to an embodiment of the present invention.

[0030] Figure 3 Schematic diagram of the layout of plate holes in an embodiment of the present invention.

[0031] Figure 4 Schematic diagram of the structure of the vacuum suction cup in an embodiment of the present invention.

[0032] In the figure: 1-plate body, 2-anti-stick lining plate, 3-plate hole, 4-frame strip, 5-wire groove, 6-vacuum suction cup, 61-suction cup body, 62-connecting column, 63-vacuum nut, 64-vacuum connecting port, 65-end nut, 66-buffer spring, 67-short tube, 7-insertion tube, 8-trachea. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0034] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0036] An anti-sticking demoulding treatment method suitable for a model box test, in which the model box is treated in the preparation stage before the test and in the demoulding stage after the test block is solidified, comprising the following steps:

[0037] Preparatory stage before the test:

[0038] Step 1, the model box includes a bottom plate, a top plate and several side plates, and the bottom plate and the side plates of the model box are provided with several plate holes 3; clean the inner surface of the model box; the model box determines whether to use the top plate according to the test requirements, and the following is explained according to the situation where the top plate is needed;

[0039] Step 2, bonding an anti-sticking lining plate 2 on the inner surface of the model box; the anti-sticking lining plate 2 is a smooth rubber plate, a smooth anti-sticking cloth or an anti-sticking paper; the anti-sticking lining plate 2 completely covers the inner surface of the model box, and the inner surface of the anti-sticking lining plate 2 is flat and smooth;

[0040] Step 3, spraying a release agent evenly on the inner surface of the anti-stick lining plate 2;

[0041] Demolding stage after the test block solidifies:

[0042] Step 4, a vacuum suction cup 6 is arranged at each plate hole 3, so that the vacuum suction cup 6 is positioned at the plate hole 3;

[0043] Step 5: When demolding, turn on the vacuum pump so that the vacuum suction cup 6 is tightly attached to the outside of the model box at the plate hole 3, and the gas between the model box and the anti-stick lining plate 2 is extracted, so that the anti-stick lining plate 2 is tightly attached to the inner surface of the model box.

[0044] The shape of the model box can be rectangular, cylindrical, frustum, prism, cone, special shape, etc. The bottom plate, top plate and side plate are only different in position and shape. Others, including the cleaning method and the method of attaching the anti-sticking lining plate 2, are the same. For the convenience of description, the bottom plate, top plate and side plate are collectively referred to as the plate body 1. The center of the vacuum suction cup 6 is provided with a plug 7 that can be inserted into the plate hole 3. When the vacuum suction cup 6 is adsorbed on the plate hole 3, the plug 7 is inserted into the plate hole 3 and does not contact the anti-sticking lining plate 2. The plate hole 3 is at least arranged at the corners, midline and center of each plate body 1; a sealing ring is filled between the plug 7 and the hole wall of the plate hole 3. The inner surface of the side of the model box is provided with a wire groove 5. The purpose of the wire groove 5 is to increase the degree of turbulence of the air flow and significantly improve the air extraction efficiency. The width of the wire groove 5 is 1.9mm~2.1mm and the depth is 0.9mm~1.1mm. In this embodiment, the plate body 1 is made of an acrylic plate, and the anti-sticking lining plate 2 is made of a 5 mm thick smooth rubber plate.

[0045] like Figures 1 to 3 The model box is in the shape of a cuboid, and is composed of four side panels, a top panel and a bottom panel assembled through a connecting structure; Figure 2 , Figure 3 As shown, the connection structure includes a frame bar 4 and bolts and nuts. The frame bar 4 is arranged at the edge of the model box, and is L-shaped. The frame bars 4 are arranged in pairs inside and outside. A pair of frame bars 4 clamps two adjacent plate bodies 1 and is fixed by bolts and nuts. Next, taking the rectangular model box as an example, each step of the present invention is described in detail.

[0046] Step 1 includes the following steps:

[0047] Step 1.1 Design of plate hole 3;

[0048] According to the gap direction of the model box splicing and the layout of the internal support structure, avoid all key parts that may affect the stability of the structure, such as the reinforcement ribs at the splicing, the reserved sensor installation position, etc., and use a high-precision laser measuring instrument to determine 9 basic hole positions at the four corners, the midpoints of the four sides and the center of the plate body 1. Considering that the air pipe 8 with an outer diameter of 12mm to 14mm is conventionally selected, the plate diameter is accurately set to 2mm larger, that is, 14mm to 16mm, to ensure that the connecting pipe can be inserted smoothly and tightly, providing a stable and uniform basic adsorption force for the smooth rubber plate and the plate body 1.

[0049] The accuracy of the punching position plays a vital role in the adsorption effect of the vacuum suction cup 6 and the stability of the entire vacuum adsorption system. Therefore, it is necessary to strictly follow the carefully designed plan and use high-precision measuring tools to determine the hole position to ensure that the punching position is consistent with the designed plate hole 3 position and the accuracy meets the requirements.

[0050] Step 1.2 slot design;

[0051] According to the joint position of the side panels of the model box and the structures such as the frame strips 4 that may be installed, a wire groove 5 is opened starting from 6 cm away from the edge of these key parts (it can be flexibly adjusted between 5 and 7 cm according to the actual structural sensitivity). The wire groove 5 is a straight groove with a width of 2 mm and a depth of 1 mm. When opening the wire groove 5, a high-precision CNC engraving machine is used for the slotting operation, which can accurately control the slot position and size, and the error is controlled within ±0.1 mm.

[0052] The size of the groove 5 with a width of 2 mm and a depth of 1 mm can not only increase the degree of air flow turbulence just right, significantly improve the air extraction efficiency, enhance the vacuum adsorption effect, but also avoid excessive weakening of the strength of the board body 1 to the greatest extent. The internal structure of the acrylic board after the groove is inspected using micro-focus X-ray detection equipment to ensure that the groove does not cause any internal damage.

[0053] The wire trough 5 needs to avoid the plate hole 3 when designing. Strictly control the distance between the slot position and the hole position to ensure that it is at least 3 cm away from the edge of the hole position, and eliminate the problems such as reduced local strength of the plate, stress concentration, or damage to the sealing structure around the hole position caused by the slot being too close to the hole position, so as to ensure the reliable and stable operation of the entire vacuum adsorption system. Before the wire trough 5 and the hole position are opened, the model box, plate hole 3 and wire trough 5 are virtually constructed and strength and stress are verified using modeling software, so as to intuitively present the relationship between the hole position and the slot position, accurately avoid potential risks in advance, and ensure that the slotting will not have any impact on the overall strength and structural stability of the model box.

[0054] After opening the wire duct 5, use a high-pressure gas spray gun (pressure not less than 0.8MPa) and other professional tools to thoroughly and carefully clean the wire duct 5 and the plate hole 3 to remove any remaining debris to prevent it from interfering with the subsequent vacuum adsorption process or entering the vacuum adsorption system and causing malfunctions. After cleaning, use a high-power optical microscope (magnification not less than 50 times) to check the cleanliness of the wire duct 5 and the cleanliness of the inner wall of the plate hole 3 to ensure that there is no residue.

[0055] Step 1.3: Clean and polish the plate 1;

[0056] For the plate body 1 that has not yet been assembled, select 400-600 mesh soft sandpaper for one side that will constitute the inner surface of the model box (including the inner surfaces of the bottom plate, top plate and side plates), and perform meticulous grinding operations along the same direction. During the grinding process, the force must always be applied evenly and gently. The core purpose is to thoroughly remove all kinds of impurities such as oil stains, mold release agent residues, and fine scratches that may exist on the surface of the plate. Avoid deformation of the plate or uneven local thickness, which will affect the subsequent processing and assembly accuracy, and ensure that the surface of the plate has a certain degree of flatness and smoothness. The flatness of the plate surface is checked by visual inspection, ruler inspection, laser flatness detector, etc.; in this embodiment, visual inspection is the main means.

[0057] Step 1.4: Clean and dry the board 1;

[0058] After the polishing process is completed, use a high-pressure gas spray gun to thoroughly and carefully clean the wire groove 5, plate hole 3, and the inner surface of the model box to remove any debris that may remain; then, use anhydrous ethanol to soak a clean, non-chipping rag and wipe the inner surface of the acrylic plate 3 to 5 times in all directions without dead corners to ensure that all impurity particles generated by polishing or originally remaining are removed, so as to avoid the residual impurities affecting the bonding effect of the anti-stick lining plate 2 and the subsequent vacuum adsorption effect. After wiping, place the plate body 1 in a dust-free and dry space to dry naturally for standby use, effectively preventing dust from adhering to the surface of the plate again, thereby always keeping the plate in a clean and flawless state.

[0059] Step 1.5: Install the sealing ring in the plate hole 3;

[0060] Insert the sealing ring into the cleaned plate hole 3. On the one hand, the sealing ring can tightly fill the tiny gap between the insert tube 7 and the wall of the plate hole 3, thereby effectively preventing air leakage and ensuring the smooth formation of the vacuum environment; on the other hand, it can also serve as a buffer layer to provide buffer protection for the wall of the plate hole 3 and the plate body 1 around the plate hole 3 during installation and subsequent use. For the hard insert tube 7, during the installation process of insert tube 7 into the plate hole 3, the sealing ring can prevent the damage to the acrylic plate caused by the instantaneous impact force generated by improper operation of the personnel, and can also prevent the insert tube 7 from rubbing against the acrylic plate to cause scratches and other damage; during use, the sealing ring can also disperse the force generated by the displacement of the vacuum suction cup 6 and the insert tube 7, avoid the insert tube 7 from colliding and scratching with the wall of the plate hole 3, reduce the situation where the acrylic plate is subjected to excessive local force, and prevent the acrylic plate from being broken or deformed due to excessive local force.

[0061] Step 1.6: Assemble and fix the model box;

[0062] like Figure 2 , Figure 3As shown, the connection structure includes a frame strip 4 and bolts and nuts. The frame strip 4 is made of aluminum alloy, and the bolts are made of bolts with a diameter of 4 to 6 mm. The length is reasonably determined according to the thickness of the frame strip 4 and the fixing requirements of the acrylic plate, generally between 20 and 30 mm. The nuts need to be selected in conjunction with the bolts to ensure that the threads can fit closely, thereby providing a stable and reliable connection effect. A sealing gasket is filled between the frame strip 4 and the plate body 1. The main function of the sealing gasket is to fill the gap between the frame strip 4 and the acrylic plate, playing a dual role of sealing and buffering, effectively preventing the occurrence of water leakage and air leakage, while reducing the stress concentration of the acrylic plate at the joint, and playing a good protective role for the plate. In this embodiment, a rubber sealing gasket with a thickness of 2 to 3 mm is selected, which has good elasticity and corrosion resistance.

[0063] The plate body 1 is inserted into the frame strip 4 for assembly and fixation to obtain a model box body with an open top.

[0064] Step 2 The installation of the anti-sticking lining plate 2 includes the following steps:

[0065] Step 2.1 Cutting and preparation;

[0066] According to the shape and size of the inner surface of the model box, use professional cutting tools to accurately cut out the anti-stick lining plate 2 (glossy rubber plate with a thickness of 5mm), and reserve 8-10mm margin on each side to facilitate the subsequent fixing operation. During the cutting process, it is necessary to ensure that the edges of the glossy rubber plate are neat and uniform, the size is accurate, and the situation of excessive splicing gaps must be avoided, because this will directly affect the sealing and fitting effect between the glossy rubber plate and the plate body 1, and thus have an adverse effect on the entire test process. Through precise cutting, it is ensured that the glossy rubber plate and the acrylic plate can be tightly combined.

[0067] Step 2.2: Fitting and fixing;

[0068] Apply special rubber glue that is well compatible with acrylic evenly on the bonding surface of the smooth rubber sheet, and start from one corner of the plate body 1, slowly and steadily bond the smooth rubber sheet to the processed inner surface. During the bonding process, use a soft scraper to gently squeeze out the air from the inside to the outside while bonding, to ensure that the air does not remain between the smooth rubber sheet and the acrylic sheet, so as to ensure the tightness of the bonding. After the bonding is completed, immediately use a clamp to fix it at the edge, and strictly follow the curing characteristics of the glue, patiently wait for 24h to 36h, so that the glue can be fully cured, and finally achieve a firm bond between the smooth rubber sheet and the acrylic sheet.

[0069] Note: Before pasting, use sandpaper to lightly polish the edges and corners of the smooth rubber sheet to increase adhesion. Then use a small brush to dip the glue and evenly apply it to the edges and corners, with a thickness of about 0.5mm to 1mm and a width that covers the polished area. After pasting one smooth rubber sheet, align the edges and corners of another smooth rubber sheet and slowly press them together to squeeze out the air so that the joints are tight and seamless. Finally, after the glue is fully cured according to the curing requirements, check the joints to ensure a firm seal.

[0070] In step 3, the mold release agent is a silicone mold release agent. After the silicone mold release agent is fully shaken and poured into the sprayer, after the smooth rubber plate and the model box are assembled and before the test block raw materials are injected into the model, keep the sprayer 35cm to 45cm away from the smooth rubber plate and spray the mold release agent evenly to ensure that the mist covers the entire surface without omission. After spraying, let it stand for 40min to 60min to allow the mold release agent to fully infiltrate the smooth rubber plate to form a complete isolation layer. During this period, keep the environment clean, dry and windless; if there is mold release agent accumulation, wipe it evenly with a rag.

[0071] When the test block is demolded, the anti-sticking lining plate 2 may be taken out of the model box as a piece because the raw materials of some test blocks are too sticky or the glue that adheres to the anti-sticking lining plate 2 fails in a vibrating state or after long-term use. Therefore, the present invention also uses a vacuum adsorption system to assist demolding to prevent the anti-sticking lining plate 2 from detaching from the inner surface of the model box. The vacuum adsorption system includes a vacuum pump, an air pipe 8, and a plurality of vacuum suction cups 6 directly connected to the vacuum pump exhaust port through the air pipe 8. A plug 7 is set in the center of the vacuum suction cup 6. When the vacuum suction cup 6 is adsorbed on the model box, the plug 7 extends into the plate hole 3 and does not contact the smooth rubber plate.

[0072] In step 4, before the vacuum suction cup 6 is installed in the model box, the vacuum suction cup 6 and the air pipe 8 are assembled first; the air pipe 8 can be a commonly used negative pressure resistant silicone tube, the inner diameter of the silicone tube is 8mm to 10mm, and the silicone tube is transparent to facilitate observation of the internal airflow state. The vacuum suction cup 6 as a whole presents a rubber / silicone elastomer structure similar to a bowl or a disc, and a hole is provided at the center, and the intubation tube 7 is vertically led out for a short section. This design guarantees the integrity of the suction surface of the main body of the vacuum suction cup 6 to the greatest extent, and provides a strong structural foundation for the subsequent stable adsorption operation. On the one hand, the intubation tube 7 plays the role of aligning the vacuum suction cup 6 to the plate hole 3, and on the other hand, it is convenient to make the air extraction position closer to the gap between the anti-sticking lining plate 2 and the inner surface of the plate body 1. In order to form the structure of the intubation tube 7, a custom-shaped special-shaped vacuum suction cup 6 can be used (the intubation tube 7 is integrally formed in the center of the disc-shaped vacuum suction cup 6), or a short tube 67 can be inserted in the center of the vacuum suction cup 6 or the air pipe 8 can be directly inserted into the hole in the center of the vacuum suction cup 6.

[0073] like Figure 4As shown, a commercially available vacuum suction cup 6 structure is shown, which includes a suction cup body 61, an air extraction nut 63 fixed on the convex surface of the suction cup body 61, a connecting column 62 with one end threadedly connected to the air extraction nut 63, a threaded section fixed to the other end of the connecting column 62, and at least two end nuts 65 cooperated with the threaded section, and a buffer spring 66 is also sleeved on the connecting column 62; a vacuum connection port 64 is provided on the air extraction nut 63, and the vacuum connection port 64 is connected to the vacuum pump through the air pipe 8 when in use. Preferably, all the vacuum suction cups 6 on one side of the model box are installed using a bracket, such as opening a column installation hole on the frame plate that constitutes the bracket, passing the connecting column 62 through the installation column and locking the position of the connecting column 62 from both sides of the frame plate with the end nut 65; if the position of the model box and the bracket is fixed, the position of the suction cup body 61 can also be changed by adjusting the vacuum nut 63 and the end nut 65, and the suction cup body 61 is moved toward the plate body 1. By applying appropriate pressure, the sealing between the suction cup body 61 and the plate body 1 is enhanced, and the stability is also improved, so that the suction cup can avoid loosening and displacement during use, ensuring that the suction cup can stably perform the adsorption function; since the vacuum suction cups 6 on one side of the model box are installed on the same bracket, the cannula 7 can also be uniformly inserted into the plate hole 3, and the suction cup body 61 will not fall off when the vacuum pump is not started, which is convenient for the rapid positioning and installation of the vacuum suction cup 6. Here are the steps for forming the insertion tube 7 on the commercially available vacuum suction cup 6 using the short tube 67: the short tube 67 is a hard tube. After passing one end of the short tube 67 through the central hole of the vacuum suction cup 6, the gap between the short tube 67 and the vacuum suction cup 6 is filled with sealing glue, and the connection between the short tube 67 and the vacuum suction cup 6 is tightened with special tape, cable tie, clamp ring, etc. to ensure that there is no air leakage. All vacuum suction cups 6 on each side of the plate body 1 are controlled by the same vacuum pump. The vacuum pump suction port is connected to each air pipe 8 through a one-to-nine joint. No branches and valves are set in the middle to ensure that each vacuum suction cup 6 can work simultaneously during the demoulding process, forming a uniform and stable adsorption force, adsorbing the smooth rubber sheet on the plate body 1, and effectively assisting the smooth demoulding process. During the connection and use of the air pipe 8, always pay attention to ensure the smoothness of the pipeline to avoid adverse conditions such as bending and twisting, so as not to hinder the normal transmission of the air flow and affect the performance of the entire vacuum adsorption system.

[0074] After rigorous calculations and actual test verification, a small vacuum pump with a suction rate of not less than 20L / min and a maximum vacuum degree of -0.1MPa was selected. This vacuum pump can fully meet the suction requirements required in the demoulding process, ensuring that the demoulding process is carried out efficiently and stably, and smoothly realizing the separation of the cement model and the model box.

[0075] In step 4, if the vacuum suction cup 6 is not fixed by a bracket, but is only connected to the vacuum pump through the air pipe 8, when the vacuum suction cup 6 is set at the plate hole 3, the cannula 7 is aligned with the plate hole 3 and gently inserted, and the vacuum pump needs to be slightly turned on to provide initial suction so that the suction cup can be adsorbed at the plate hole 3 to position; at this time, due to the existence of initial suction, the vacuum suction cup 6 can close the plate hole 3 and fit on the outside of the plate body 1 without falling off. If all vacuum suction cups 6 on the same side are installed on the same bracket, and the bracket can support itself, the cannula 7 can be installed to the plate hole 3 by simply adjusting the position of the bracket, without using a vacuum pump to provide initial suction.

[0076] When the vacuum adsorption system has been installed and debugged correctly, the adhesive material slurry is filled into the model box according to the specifications of the test design to carry out the target test.

[0077] In the demoulding stage after the test, the present invention also includes the following steps:

[0078] In step 5, after the model test is completed and the demoulding conditions are met, turn on the vacuum pump, wait for the vacuum degree to stabilize between -0.08MPa and -0.1MPa for a period of time, disassemble the connection structure of the model box and manually remove the model box for demoulding; when removing, start from one side of the model box, slowly and evenly apply an outward pulling force to ensure that the pulling force can be evenly distributed on the surface of the model box to avoid excessive force on a single point. During the demoulding process, continue to pay attention to the vacuum degree and the adsorption state of the smooth rubber sheet. If the vacuum degree fluctuates by more than 0.02MPa or an obvious air leakage sound is heard, the operation should be suspended immediately, and the entire system should be thoroughly checked to check whether the vacuum suction cup 6 is loose, whether the air pipe 8 is damaged or leaking, and whether the sealing ring is well sealed. After repairing the problem, continue the demoulding operation to ensure the safety and efficiency of the demoulding process.

[0079] Vacuum adsorption assisted demoulding mainly works by forming a negative pressure in the space between the vacuum suction cup 6 and the outside of the plate body 1. Although the vacuum suction cup 6 is sucked on the acrylic plate, this suction will be transmitted to the inner side of the smooth rubber plate and the acrylic plate through the plate hole 3, so that the smooth rubber plate fits tightly on the acrylic plate, and at the same time, this suction will be transmitted to the entire internal structure of the model box. When the vacuum pump is turned on to reach a certain vacuum degree, the pressure difference generated inside the model box will act on the contact interface between the test block and the anti-sticking lining plate 2. Because the release agent fully infiltrates the anti-sticking lining plate 2 to form a complete isolation layer, the adhesion between its surface and the test block is relatively small. Under the action of the pressure difference, the test block is easily detached from the surface of the anti-sticking lining plate 2. The anti-sticking lining plate 2 can be a soft or hard rubber plate, an ordinary or oil-resistant or acid-resistant rubber plate. Considering the cost, it is preferred that the anti-sticking lining plate 2 adopts a smooth soft ordinary rubber plate, which has a certain elasticity and deformability and can better conform to the demolding process of the test block under pressure without hindering the separation of the test block and the smooth rubber plate.

[0080] In the prior art, a single anti-sticking measure using a release agent is used in model box tests with small specimens and low external loads, which can basically meet the test requirements; however, the model test of the present invention is large-scale and frequent, and requires a large load to be applied outside the model box, such as an external load that can break small-diameter steel bars; at this time, a single anti-sticking measure is used, which has a low fault tolerance rate or a low success rate. If the anti-sticking fails, the model box needs to be reprocessed, and the cost is much more expensive than the comprehensive anti-sticking means used in the present invention in terms of time and material costs. This scheme provides a comprehensive anti-sticking method, the main content of which is to carefully bond the anti-sticking inner lining plate 2 on the inner surface of the model box + evenly spray the release agent + vacuum adsorb the anti-sticking inner lining plate 2 from the outside of each plate body 1, which is a test block demoulding treatment method with a degree of abundance.

[0081] If there are still test block chips on the inner surface of the model box after vacuum adsorption demoulding, auxiliary cleaning measures are required, including the following steps:

[0082] Step 6. If some test block scraps, such as cement, remain in the model box after vacuum adsorption demolding, you can carefully use small hand tools, such as chisels, scrapers, etc., to carefully remove the remaining cement blocks while ensuring that the model box is not damaged. During the cleaning process, special attention should be paid to the control of strength and angle to prevent scratches or deformation of the model box due to improper operation. For some more stubborn residual parts, you can consider using chemical reagents for auxiliary cleaning, but before use, you must first test it in a small hidden area of ​​the model box to ensure that the reagent will not damage the material of the model box. For example, a diluted weak acid solution (such as hydrochloric acid) may help dissolve cement, but when using it, be sure to strictly control the concentration and ensure safe use to prevent accidents.

[0083] If the anti-sticking effect of the anti-sticking lining plate 2 is reduced, damaged or cracked due to operating errors or long-term use, a new anti-sticking lining plate 2 needs to be replaced to prevent the test material from sticking to the inner surface of the model box.

[0084] Due to the presence of the anti-sticking inner lining plate 2 and the use of a vacuum adsorption system to fix the anti-sticking inner lining plate 2 during demoulding, the inner surface of the model box plate body 1 is difficult to be damaged during the device preparation, test process and cleaning process after demoulding, and the service life of the model box plate body 1 can be extended. The anti-sticking inner lining plate 2 set close to the model box also ensures that the shape and size of the test block cast out of the model box are completely uniform as much as possible, which can ensure the consistency of the test block.

[0085] After all tests are completed, the model can be assembled and disassembled for storage. When disassembling the model box, follow the reverse order of installation. First, loosen the connecting bolts between the side panels and the bottom panel to separate the side panels from the bottom panel; then, remove the connecting bolts and corner brackets at the corners and take off each side panel. During the disassembly process, keep all parts in good condition to prevent them from being lost or damaged, so that they can be easily reassembled and used later, thereby reducing the test cost and improving the utilization of resources.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. An anti-sticking demoulding treatment method suitable for a model box test, characterized in that: The model box is processed in the preparation stage before the test and the demoulding stage after the test, including the following steps: Preparatory stage before the test: Step 1: The model box includes a bottom plate and a plurality of side plates, wherein the bottom plate and the side plates of the model box are provided with a plurality of plate holes (3); cleaning the inner surface of the model box; Step 2, bonding an anti-sticking lining plate (2) to the inner surface of the model box; the anti-sticking lining plate (2) completely covers the inner surface of the model box, and the inner surface of the anti-sticking lining plate (2) is flat and smooth; Step 3, spraying a release agent evenly on the inner surface of the anti-sticking lining plate (2); Step 4: a vacuum suction cup (6) is arranged at each plate hole (3) so that the vacuum pump is positioned at the plate hole (3); demoulding stage after the test: Step 5: When demoulding, turn on the vacuum pump so that the vacuum suction cup (6) is tightly attached to the outer side of the model box at the plate hole (3), and the gas between the model box and the anti-sticking lining plate (2) is extracted, so that the anti-sticking lining plate (2) is tightly attached to the inner surface of the model box.

2. The anti-sticking demoulding treatment method suitable for model box test according to claim 1, characterized in that: The center of the vacuum suction cup (6) is provided with an insertion tube (7) which can be inserted into the plate hole (3). When the vacuum suction cup (6) is adsorbed on the plate hole (3), the insertion tube (7) is inserted into the plate hole (3) and does not contact the anti-sticking lining plate (2).

3. The anti-sticking demoulding treatment method suitable for model box test according to claim 2 is characterized in that: In step 1, the plate holes (3) are at least arranged at the corners, midlines and centers of the bottom plate and the side plates; and a sealing ring is filled between the insert tube (7) and the hole wall of the plate hole (3).

4. The anti-sticking demoulding treatment method suitable for model box test according to claim 1, characterized in that: A wire groove (5) is provided on the inner surface of the side of the model box. The wire groove (5) has a width of 1.9 mm to 2.1 mm and a depth of 0.9 mm to 1.1 mm. The wire groove (5) is 5 cm to 7 cm away from the corner of the model box. The distance from the wire groove (5) to the edge of the plate hole (3) is at least 3 cm.

5. The anti-sticking demoulding treatment method suitable for model box test according to claim 4 is characterized in that: Before the wire trough (5) and the hole positions are opened, the model box, the plate hole (3) and the wire trough (5) are virtually constructed and strength and stress calculations are performed using modeling software to ensure that the opening of the trough will not have any effect on the overall strength and structural stability of the model box.

6. The anti-sticking and demoulding treatment method suitable for model box test according to claim 1, characterized in that: In step 1, before cleaning the inner surface of the model box, first use soft sandpaper to evenly and gently polish the inner surface of the model box in the same direction to thoroughly remove the oil stains, mold release agent residues and minor scratches that may exist on the surface of the plate, while ensuring that the inner surface is flat and smooth; After grinding, the wire groove (5), the plate hole (3), and the inner surface of the model box are thoroughly and carefully cleaned with a high-pressure gas spray gun to remove any remaining debris, and the inner surface of the model box is wiped clean with anhydrous ethanol several times to ensure that all impurity particles generated by grinding or originally remaining are completely removed; the model box is dried and stored in a dust-free environment to keep the surface of the model box clean and flawless.

7. The anti-sticking demoulding treatment method suitable for model box test according to claim 1, characterized in that: In step 2, according to the shape and size of the inner surface of the model box, the anti-sticking lining plate (2) corresponding to the bottom plate and the side plate of the model box is accurately cut out to ensure that there is no excessive joint seam after the anti-sticking lining plate (2) is attached to the inner surface of the model box, and there is no air residue between the anti-sticking lining plate (2) and the inner surface of the model box.

8. The anti-sticking demoulding treatment method suitable for model box test according to claim 1, characterized in that: The anti-sticking lining plate (2) is a smooth rubber plate, a smooth anti-sticking cloth or an anti-sticking paper.

9. The anti-sticking demoulding treatment method suitable for model box test according to claim 1, characterized in that: In step 3, the silicone release agent is evenly sprayed on the inner surface of the model box, and then left to stand for 40 to 60 minutes after spraying, so that the release agent can fully infiltrate the anti-sticking lining plate (2) to form a complete isolation layer.

10. The anti-sticking and demoulding treatment method suitable for model box test according to claim 1, characterized in that: The model box is composed of a plurality of side panels and a bottom panel assembled through a connecting structure; In step 5, after the model test is completed and the demolding conditions are met, turn on the vacuum pump, wait for the vacuum degree to stabilize between -0.08MPa and -0.1MPa for a period of time, disassemble the connection structure and manually remove the model box for demolding; when removing, start from one side of the model box, slowly and evenly apply outward pulling force to ensure that the pulling force can be evenly distributed on the surface of the model box to avoid excessive force on a single point; during the demolding process, the vacuum degree fluctuation is required not to exceed 0.02MPa. If the vacuum degree fluctuates by more than 0.02MPa or an obvious air leakage sound is heard, the operation should be suspended immediately, the entire system should be fully checked, and the demolding operation should be continued after the problem is repaired.

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