Radiation protection shielding plate and preparation device and method

Abstract

The present invention provides a radiation shielding plate and a preparation device and method. The radiation shielding plate comprises the following raw materials in parts by weight: 1-5 parts of quartz powder, 2-8 parts of fly ash, 3-10 parts of reinforcing fiber, 6-10 parts of sulphoaluminate cement, 65-80 parts of barium sulfate, 5-10 parts of zinc powder, 3-5 parts of sodium silicate, and 5-8 parts of phosphogypsum. The device comprises a first unit sheet forming device and a second unit sheet forming device arranged symmetrically, the unit sheet forming device comprises a first fabric dipping device and a second fabric dipping device, a metal mesh unwinding device is further provided between the first fabric dipping device and the second fabric dipping device, the unit sheet forming device further comprises a second pair of rollers, the second pair of rollers is used to press the fabric and the metal mesh into a unit sheet, the problem of limited radiation protection performance of the plate made by the traditional plate forming method is solved by combining the raw materials with the equipment, the plate can be used for nuclear pollution prevention and control and radiation prevention and control of hospitals and scientific research institutions, and the industrial waste phosphogypsum is also applied.

Description

Technical Field

[0001] The present invention relates to the fields of nuclear pollution prevention and control, radiation protection technology for hospitals and scientific research institutions, and resource utilization technology for industrial wastes, and in particular to a radiation protection shielding plate and a preparation device and method thereof. Background Art

[0002] While radiation technology brings great convenience to mankind, it also has some worrying aspects. Among them, the most widely concerned issue is the impact of electromagnetic radiation on human health. Common types of radiation mainly include alpha (alpha), beta (beta), gamma (gamma), X-ray radiation and neutron radiation. Among them, alpha particles are actually high-speed helium nuclei, and beta particles are electrons. They have weak penetration ability in matter. Gamma (gamma) and X-ray radiation are electromagnetic waves with extremely short wavelengths, extremely high frequencies and very high energy. Neutron radiation is a high-speed moving neutron stream that can cause direct damage to biological tissues. It can also be converted into other forms of radiation, such as gamma rays, by interacting with atomic nuclei, causing indirect damage. In nuclear power plants, hospitals, factories, scientific research and other places, a sufficiently thick shielding material, such as a radiation shield, is added between people and radiation sources to shield radiation. At present, the existing radiation protection boards all use lead added inside to achieve the purpose of X-ray radiation protection. However, due to the large mass of lead, the weight of the radiation protection board is greatly increased. In addition, adding lead to the radiation protection board will significantly increase the manufacturing cost of the radiation protection board, making the existing radiation protection board with X-ray protection function expensive and difficult to promote and apply. There are also some heavy metal element compounds such as barium sulfate, which have a large core mass. When the radiation collides with the core of these heavy metals, the energy of the radiation is easily absorbed, thereby preventing the radiation from penetrating. Compared with lead, it is non-toxic and harmless. Therefore, it is used as one of the important materials for radiation protection boards, but its performance needs to be improved.

[0003] In addition, the traditional method of forming radiation-proof panels is to wrap a thin blanket around a ring-shaped forming cylinder, absorb the slurry, extrude it into a blank, and then remove the blank and stack it for compaction. Since the water in the slurry vaporizes due to heat during the pressing process to form voids, the overall density of the panel is not high and particles can easily penetrate. In addition, even if metal powder is added to the slurry, it is difficult to form an effective electromagnetic shielding layer due to the small proportion of powder and the gaps between particles. Therefore, the panels made by this method have limited radiation protection effect. Summary of the invention

[0004] The present invention provides a radiation shielding plate and a preparation device and method thereof, which solve the problem that the radiation protection performance of a plate made by a traditional plate forming method is limited.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A radiation shielding plate comprises the following raw materials in parts by weight: 1-5 parts of quartz powder, 2-8 parts of fly ash, 3-10 parts of reinforcing fiber, 6-10 parts of sulphoaluminate cement, 65-80 parts of barium sulfate, 5-10 parts of zinc powder, 3-5 parts of sodium silicate, 5-8 parts of phosphogypsum, 0.12-0.48 parts of water glass and 0.3-1.2 parts of zeolite powder.

[0007] The preparation equipment of the radiation shielding plate includes a first unit sheet forming device and a second unit sheet forming device which are symmetrically arranged. The unit sheet forming device includes a first fabric dipping device and a second fabric dipping device. A metal mesh unwinding device is also provided between the first fabric dipping device and the second fabric dipping device. The unit sheet forming device also includes a second pair of rollers, which are used to press the fabric and the metal mesh into a unit sheet. A third pair of rollers is also provided. A cutting machine is provided on one side of the third pair of rollers. The third pair of rollers is used to press the unit sheets made by the first unit sheet forming device and the second unit sheet forming device into a composite blank. The cutting machine is used to cut the composite blank. A pressing device is also provided, which is used to press multiple stacked composite blanks.

[0008] In a preferred embodiment, the fabric dipping device includes a slurry pool, a fabric unwinding device and a first pair of roller devices. The fabric unwinding device and the dipping guide wheel are rotatable. A dipping guide wheel is provided in the slurry pool. The first pair of roller devices is provided on a side close to the second pair of roller devices. The first pair of roller devices has two parallel and spaced pressure rollers. The fabric passes around the dipping guide wheel from below to be immersed in the slurry pool, and one end of the fabric passes through the gap between the pressure rollers of the first pair of roller devices.

[0009] In a preferred embodiment, the second pair of rollers comprises two rows of press rollers arranged in parallel and at intervals, and the metal mesh is arranged between the two layers of fabric and passes through the gap between the press rollers to be pressed into a unit sheet.

[0010] In the preferred scheme, a first guide roller device is provided at one end of the unit sheet forming device close to the third pair of roller devices, the guide roller device is a cavity structure, the guide roller device includes a rotatable outer cylinder, the outer cylinder is provided with a vent hole, the unit sheet bypasses the first guide roller device so that the first surface of the unit sheet fits against the outer wall of the outer cylinder of the first guide roller device, the guide roller device is provided with a first cover body and a second cover body that fits against the inner wall of the outer cylinder, the first cover body and the second cover body are provided with a vent port, a first heating device is provided in the first cover body, an arc plate is provided on the outside of the first guide roller device, a rollable continuous pressure roller is provided on the inside of the arc plate, and a second heating device is provided in the arc plate.

[0011] In the preferred scheme, a row nozzle is provided between the first guide roller device and the second guide roller device, and the row nozzle is used to spray filling glue onto the first surface of the unit sheet. A second guide roller device is also provided on one side of the first guide roller device. The unit sheet bypasses the first guide roller device and the second guide roller device in sequence, and the second surface of the unit sheet is in contact with the outer wall of the outer cylinder of the second guide roller device. A second cover body is provided on the inner side of the contact point between the unit sheet and the outer cylinder of the second guide roller device, and the second cover body is in contact with the inner wall of the outer cylinder of the second guide roller device.

[0012] In a preferred embodiment, the first guiding roller device also includes a drum frame, the outer wall of the drum frame is sleeved with a plurality of slip rings, the slip rings are slidably sleeved with the inner wall of the outer drum, the drum frame is provided with a plurality of hollow grooves along the circumferential direction, the first cover body and the second cover body are arranged in the hollow grooves, a gear ring is provided on the inner wall of one end of the outer drum, a through groove is provided on the side wall at one end of the drum frame, a driving motor is also provided at one end of the drum frame, a gear is provided at the shaft end of the driving motor, and the gear passes through the through groove to engage with the gear ring.

[0013] In the preferred embodiment, a plurality of air dividers are attached to the outer wall of the outer cylinder, and the plurality of air dividers are connected end to end to form a full circle structure. The air dividers are hard porous structures, and a plurality of parallel and spaced air grooves are arranged along the circumferential direction on the outer wall of the outer cylinder, and the air grooves are connected to the air holes.

[0014] In the preferred embodiment, the pressing device includes a frame, a containing box is provided at the lower end of the frame, and a pressing plate is provided at the upper end of the pressing plate. The guide rod is slidably connected to the frame, and a linear drive device is provided at the upper end of the frame, which drives the pressing plate to move up and down.

[0015] In the preferred embodiment,

[0016] The fabric is transported to the slurry pool to be soaked in slurry, and is preliminarily compacted and squeezed out of excess slurry by the first pair of rollers;

[0017] The fabric is pressed on both sides of the metal mesh by a second pair of rollers to form a unit sheet, and the second pair of rollers preheats the unit sheet;

[0018] The unit sheet is transferred to the first guide roller device and bypasses the first guide roller device, so that the first side of the unit sheet is in contact with the outer side of the first guide roller device, the outer cylinder rotates, the first heating device and the arc plate in the first cover body heat the outer cylinder from both inside and outside, the outer cylinder transfers the heat to the unit sheet, negative pressure is introduced into the second cover body and the first side of the unit sheet is adsorbed, the unit sheet is vacuum dehydrated on one side, and the continuous pressing roller further compacts the unit sheet;

[0019] Pass pulsed positive pressure air into the first cover body to blow out the sucked slurry and glue, and at the same time, the cleaning roller brush cleans the outer wall of the first guide roller device;

[0020] The row nozzle sprays the filling glue on the first side of the unit chip;

[0021] The unit sheet passes around the second guide roller device, so that the second side of the unit sheet is attached to the outer side of the second guide roller device, and the second cover body absorbs the second side of the unit sheet, performs single-side vacuum dehydration on the unit sheet, and absorbs the filling glue into the crack gap;

[0022] The third pair of rollers further presses the unit sheets on the first unit sheet forming device and the second unit sheet forming device to form a composite blank;

[0023] cutting the composite blank into a predetermined shape;

[0024] Multiple composite blanks are sprayed with filling glue on both sides and then stacked, and a pressing device performs final pressing on the composite blanks to form a shielding plate.

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

[0026] 1. The raw materials are industrial waste phosphogypsum and fly ash, which are turned into treasure. Under the dual effects of cement clinker, water glass and barium sulfate, phosphogypsum and fly ash continuously generate ettringite with expansion properties, which is conducive to the fusion of reinforcing fibers (using asbestos fibers) with the components in the raw materials, thereby increasing the density in the later stage and improving its radiation performance.

[0027] 2. The metal mesh is embedded in the fabric layer. Compared with metal powder, the electromagnetic shielding effect is better, and the coverage is comprehensive and uniform without loopholes. The metal mesh itself improves the structural strength of the single-layer plate. The multi-layer pressing molding method is adopted, and the final formed plate has multiple layers of metal mesh, and the number and density of shielding layers are greatly improved. Double-sided vacuum dehydration is carried out during the continuous transmission of the unit sheet without stopping the line, which improves production efficiency. The negative pressure is used to penetrate the glue into the gasification gap, which not only increases the density of the plate, but also the three-dimensional mesh glue layer makes the fabric and the metal mesh, the unit sheets, and the blanks firmly bonded together, greatly reducing the possibility of delamination and shedding between the plates.

[0028] 3. The plate produced by the present invention has a wide range of applications, including nuclear pollution prevention and control, radiation detection in hospitals, and radiation prevention and control in scientific research institutions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Figure 1 It is a molding process diagram.

[0031] Figure 2 It is a schematic diagram of continuous vacuum dehydration.

[0032] Figure 3 This is a diagram of the internal structure of the composite blank.

[0033] Figure 4It is a metal mesh structure diagram.

[0034] Figure 5 It is a schematic diagram of the pressing device.

[0035] Figure 6 It is a cross-sectional view of the guide roller device.

[0036] Figure 7 It is an exploded view of the guide roller device.

[0037] In the figure: slurry pool 1; fabric unwinding device 101; slurry dipping guide wheel 102; metal mesh 103; fabric 104; unit sheet 105; composite blank 106; adhesive layer 107; crack gap 108; first pair of rollers 2; metal mesh unwinding device 3; second pair of rollers 4; first guide roller device 5; first cover 501; second cover 502; first heating device 503; ventilation port 504; outer cylinder 505; ventilation hole 506; air groove 507; cylinder Frame 508; hollow groove 509; slip ring 510; gear ring 511; drive motor 512; through groove 513; air divider 514; fixed ring 515; arc plate 6; continuous pressure roller 601; second heating device 602; cleaning roller brush 7; second guide roller device 8; row nozzle 9; third pair of rollers 10; cutting machine 11; pressing device 12; frame 1201; containing box 1202; pressing plate 1203; guide rod 1204; linear drive device 1205. DETAILED DESCRIPTION

[0038] like Figure 1-7 In the invention, a radiation shielding plate preparation device is provided, comprising a first unit sheet forming device and a second unit sheet forming device which are symmetrically arranged, the unit sheet forming device comprising a first fabric dipping device and a second fabric dipping device, a metal mesh unwinding device 3 is further provided between the first fabric dipping device and the second fabric dipping device, the unit sheet forming device further comprising a second pair of rollers 4, the second pair of rollers 4 being used to press a fabric 104 and a metal mesh 103 into a unit sheet 105, a third pair of rollers 10 is further provided, a cutting machine 11 is provided on one side of the third pair of rollers 10, the third pair of rollers 10 is used to press the unit sheets 105 made by the first unit sheet forming device and the second unit sheet forming device into a composite blank 106, the cutting machine 11 is used to cut the composite blank 106, a pressing device 12 is further provided, the pressing device 12 is used to press a plurality of stacked composite blanks 106.

[0039] The slurry can be a mixture of quartz powder, sulphoaluminate cement, reinforcing fiber, barium sulfate, fly ash, zinc powder and sodium silicate.

[0040] The fabric 104 can be a porous material such as cloth or blanket that has a certain ability to absorb and retain the slurry.

[0041] A recovery pool is provided below the first pair of rollers 2 , and the first pair of rollers 2 rolls and compacts the slurry on the fabric 104 , and the squeezed excess slurry drips into the recovery pool.

[0042] In a preferred embodiment, the fabric dipping device includes a slurry pool 1, a fabric unwinding device 101 and a first pair of roller devices 2. The fabric unwinding device 101 and the dipping guide wheel 102 are rotatable. The slurry pool 1 is provided with a dipping guide wheel 102. The first pair of roller devices 2 is arranged on a side close to the second pair of roller devices 4. The first pair of roller devices 2 have two parallel and spaced pressure rollers. The fabric 104 passes around the dipping guide wheel 102 from below to be immersed in the slurry pool 1, and one end of the fabric 104 passes through the gap between the pressure rollers of the first pair of roller devices 2.

[0043] In a preferred embodiment, the second pair of rollers 4 comprises two rows of press rollers arranged in parallel and at intervals, and the metal mesh 103 is disposed between two layers of fabric 104 and passes through the gap between the press rollers to be pressed into a unit sheet 105 .

[0044] The structure of the third pair of rollers 10 is the same as that of the second pair of rollers 4 .

[0045] In the preferred embodiment, a first guide roller device 5 is provided at one end of the unit sheet forming device close to the third pair of roller devices 10. The guide roller device is a cavity structure. The guide roller device includes a rotatable outer cylinder 505. A vent hole 506 is provided on the outer cylinder 505. The unit sheet 105 bypasses the first guide roller device 5 so that the first surface of the unit sheet fits against the outer wall of the outer cylinder 505 of the first guide roller device 5. A first cover body 501 and a second cover body 502 fitting against the inner wall of the outer cylinder 505 are provided in the guide roller device. The first cover body 501 and the second cover body 502 are provided with a vent port 504. A first heating device 503 is provided in the first cover body 501. An arc plate 6 is provided on the outside of the first guide roller device 5. A rollable continuous pressure roller 601 is provided on the inside of the arc plate 6. A second heating device 602 is provided in the arc plate 6.

[0046] The second heating device 602 and the first heating device 503 can be electric heating wires. The pressure roller is provided with electric heating wires to preheat the unit sheet 105.

[0047] The second cover body 502 is arranged on the inner side of the joint between the unit sheet 105 and the outer cylinder 505, and the arc plate 6 is arranged on the outer side and close to the unit sheet 105. The first cover body 501 is arranged on the non-joining part, and the first cover body 501 and the second cover body 502 are fixed. When the outer cylinder 505 rotates, it is first heated by the first heating device 503 in the first cover body 501, and the unit sheet 105 is heated when it contacts the outer wall of the outer cylinder 505, and is pulled forward with the rotation of the outer cylinder 505. The vent port 504 of the second cover body 502 is connected to the negative pressure air path, and the inside of the second cover body 502 is evacuated, and the moisture in the unit sheet 105 is heated and quickly gasified under low pressure and is drawn away from the first side of the unit sheet. The second half of the arc plate 6 is provided with a rotatable continuous pressing roller 601, and under the rolling pressure of the continuous pressing roller 601, the unit sheet 105 that loses moisture is compacted.

[0048] A cleaning roller brush 7 is further provided on the outer side of each first guide roller device 5 . The cleaning roller brush 7 abuts against the outer wall of the first guide roller device 5 and can brush the outer surface of the first guide roller device 5 .

[0049] In the preferred scheme, a row nozzle 9 is provided between the first guide roller device 5 and the second guide roller device 8, and the row nozzle 9 is used to spray filling glue onto the first surface of the unit sheet. A second guide roller device 8 is also provided on one side of the first guide roller device 5. The unit sheet 105 passes around the first guide roller device 5 and the second guide roller device 8 in sequence, and the second surface of the unit sheet is attached to the outer wall of the outer cylinder 505 of the second guide roller device 8. A second cover body 502 is provided on the inner side of the attachment point between the unit sheet 105 and the outer cylinder 505 of the second guide roller device 8, and the second cover body 502 is attached to the inner wall of the outer cylinder 505 of the second guide roller device 8.

[0050] Since the first surface of the unit sheet loses moisture and generates crack gaps 108, after the row nozzle 9 of the first unit sheet forming device sprays glue (such as epoxy resin or other heat-resistant glue), the second cover 502 of the second guide roller device 8 reversely extracts moisture from the second surface of the unit sheet, and at the same time absorbs the glue into each crack gap 108 for filling, and a part of it remains on the surface of the second surface of the unit sheet. Since the first unit sheet forming device and the second unit sheet forming device are symmetrically arranged, the adjacent surfaces of the two unit sheets 105 are sprayed with filling glue, and the glue-carrying sides of the two unit sheets 105 are attached and pressed into one by the third pair of roller devices 10 to form a composite blank 106. The contact between the two unit sheets 105 is a bonding layer 107 and a crack-shaped glue layer in multiple regions. After solidification, the bonding layer 107 and the integrated structure of the crack-shaped glue layer firmly combine the two unit sheets 105 like a hook, greatly reducing the possibility of the composite blank 106 falling off in layers.

[0051] Since the glue is between the two unit sheets 105 and is pressed together, the cutting machine 11 will not get too much glue when cutting.

[0052] Similarly, when the laminating device 12 laps the multi-layer composite blank 106 , filling glue is sprayed on both sides of the composite blank 106 . During laminating, the glue penetrates into the composite blank 106 to form a mesh connection structure, thereby increasing the connection force between the layers.

[0053] In the preferred embodiment, the first guiding roller device 5 also includes a drum frame 508, and the outer wall of the drum frame 508 is sleeved with multiple slip rings 510, and the slip rings 510 are slidably sleeved with the inner wall of the outer cylinder 505. The drum frame 508 is provided with multiple hollow grooves 509 along the circumferential direction, and the first cover body 501 and the second cover body 502 are arranged in the hollow grooves 509. A gear ring 511 is provided on the inner wall of one end of the outer cylinder 505, and a through groove 513 is provided on the side wall of one end of the drum frame 508. A driving motor 512 is also provided at one end of the drum frame 508, and a gear is provided at the shaft end of the driving motor 512, and the gear passes through the through groove 513 to engage with the gear ring 511.

[0054] The drum frame 508 and the first and second covers 501 and 502 are fixed parts, which are placed on the ground through the machine connection, and the driving motor 512 drives the outer drum 505 to rotate. The first and second covers 501 and 502 are equipped with sealing strips at the ends that contact the inner wall of the outer drum 505 to achieve dynamic sealing.

[0055] In the preferred embodiment, a plurality of air dividing plates 514 are attached to the outer wall of the outer cylinder 505, and the plurality of air dividing plates 514 are connected end to end to form a full circular structure. The air dividing plates 514 are hard porous structures, and a plurality of parallel and spaced air grooves 507 are provided on the outer wall of the outer cylinder 505 along the circumferential direction, and the air grooves 507 are connected to each air vent 506.

[0056] The air dividing sheet 514 is made of hard material and has a structure with multiple fine holes, which can more evenly adsorb each area of ​​the unit sheet 105. The fine holes are connected to each ventilation hole 506 through the air groove 507, and the ventilation hole 506 is connected to the inside of the first cover body 501 and the second cover body 502.

[0057] The air dividing plate 514 is pressed onto the outer tube 505 through a fixing ring 515 , and the air dividing plate 514 is replaceable.

[0058] In the preferred embodiment, the pressing device 12 includes a frame 1201, a containing box 1202 is provided at the lower end of the frame 1201, and a pressing plate 1203 is provided at the upper end of the pressing plate 1203. The guide rod 1204 is slidably connected to the frame 1201. A linear driving device 1205 is also provided at the upper end of the frame 1201, and the linear driving device 1205 drives the pressing plate 1203 to move up and down.

[0059] The containing box 1202 is used to place the composite blanks 106. The composite blanks 106 are sprayed with filling glue on both sides and then stacked and placed in the containing box 1202. The linear drive device 1205 is a servo press or a hydraulic cylinder. The containing box 1202 drives the pressing plate 1203 to press down and press each composite blank 106 into a shielding plate.

[0060] In the preferred embodiment,

[0061] The fabric 104 is transported to the slurry pool 1 to be soaked in slurry, and is preliminarily compacted and squeezed out of excess slurry by the first pair of rollers 2;

[0062] The fabric 104 is pressed on both sides of the metal mesh 103 by the second pair of rollers 4 to form a unit sheet 105. The second pair of rollers 4 preheats the unit sheet 105.

[0063] The unit sheet 105 is transferred to the first guide roller device 5 and bypasses the first guide roller device 5, so that the first surface of the unit sheet is attached to the outer surface of the first guide roller device 5, the outer cylinder 505 rotates, the first heating device 503 and the arc plate 6 in the first cover body 501 heat the outer cylinder 505 from both inside and outside, the outer cylinder 505 transfers heat to the unit sheet 105, negative pressure is introduced into the second cover body 502 and the first surface of the unit sheet is adsorbed, the unit sheet 105 is vacuum-dehydrated on one side, and the continuous pressing roller 601 further compacts the unit sheet 105;

[0064] A pulsed positive pressure gas is introduced into the first cover body 501 to blow out the sucked slurry and glue. At the same time, the cleaning roller brush 7 brushes the outer wall of the first guide roller device 5.

[0065] The row nozzle 9 sprays the filling glue on the first surface of the unit chip;

[0066] The unit sheet 105 passes around the second guide roller device 8, so that the second surface of the unit sheet is attached to the outer surface of the second guide roller device 8, and the second cover 502 absorbs the second surface of the unit sheet, performs one-side vacuum dehydration on the unit sheet 105, and absorbs the filling glue into the crack gap 108;

[0067] The third pair of rollers 10 further presses the unit sheets 105 on the first unit sheet forming device and the second unit sheet forming device to form a composite blank 106;

[0068] Cutting the composite blank 106 into a predetermined shape;

[0069] A plurality of composite blanks 106 are stacked after being sprayed with filling glue on both sides, and the pressing device 12 performs final pressing on the composite blanks 106 to form a shielding plate.

[0070] Embodiment 3:

[0071] The soaking slurry in the slurry pool 1 includes the following raw materials in parts by weight: 2 parts of quartz powder, 5 parts of fly ash, 8 parts of reinforcing fiber, 8 parts of sulphoaluminate cement, 68 parts of barium sulfate, 8 parts of zinc powder, 4 parts of sodium silicate, 6 parts of phosphogypsum, 0.35 parts of water glass, and 0.9 parts of zeolite powder. The mass percentage of the slurry is 32%.

[0072] The pressed slab was placed in pre-curing for 14 hours at a temperature of 60°C for 4.5 hours;

[0073] The pre-cured slab is placed in an autoclave for curing: from 0 to 1.0 MPA for 4 hours, constant temperature and pressure at 1.0 MPA for 12 hours, and then reduced from 1.0 MPA to 0 for 1.2 hours.

[0074] After autoclaving and curing, the slabs are dried to reduce the moisture content to below 9%;

[0075] The dried slab is sanded and edged to obtain a radiation-proof sheet.

[0076] The results of the 10mm plate test using this method are as follows: apparent density 1.5g / cm3

[0077] Radionuclide limit: The test method is GB6566-2010, internal exposure index (IRa) 0.03 (standard ≤ 1); external exposure index (IRa) 0.07 (standard ≤ 1.3);

[0078] Phosphogypsum is a waste product in the production process of phosphate fertilizers, and fly ash is a waste product of thermal power plants. Both are difficult to dispose of and need to be utilized as resources. In the present invention, phosphogypsum and fly ash continuously generate calcium aluminate with expansion properties under the dual effects of cement clinker, water glass and barium sulfate, which are applied to the application process of radiation-proof panels. The generated micro-expansion is combined with the reinforcing fiber, which is conducive to the fusion of the reinforcing fiber (using asbestos fiber) with the components in the raw materials, increasing the fiber's adsorption of substances, thereby increasing the density in the later stage and improving its radiation performance.

[0079] If the phosphogypsum in the method is removed and other factors remain unchanged, the test results of the board are as follows: apparent density 1.2g / cm3; internal radiation index (IRa) 0.06 (standard ≤1); external radiation index (IRa) 0.09 (standard ≤1.3). By comparison, it can be seen that phosphogypsum, as an auxiliary material, can bring unexpected effects to the radiation protection effect of the radiation protection board.

[0080] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A preparation device for a radiation shielding plate, characterized in that: The invention comprises a first unit sheet forming device and a second unit sheet forming device which are symmetrically arranged, the unit sheet forming device comprising a first fabric dipping device and a second fabric dipping device, a metal mesh unwinding device (3) being arranged between the first fabric dipping device and the second fabric dipping device, the unit sheet forming device further comprising a second pair of rollers (4), the second pair of rollers (4) being used to press the fabric (104) and the metal mesh (103) into a unit sheet (105), a third pair of rollers (10) being arranged, a cutting machine (11) being arranged on one side of the third pair of rollers (10), the third pair of rollers (10) being used to press the unit sheets (105) produced by the first unit sheet forming device and the second unit sheet forming device into a composite blank (106), the cutting machine (11) being used to cut the composite blank (106), and a pressing device (12) being arranged, the pressing device (12) being used to press a plurality of stacked composite blanks (106); The second pair of rollers (4) comprises two rows of press rollers arranged in parallel and spaced apart from each other, the metal mesh (103) is arranged between the two layers of fabric (104) and passes through the gap between the press rollers to be pressed into a unit sheet (105); A first guide roller device (5) is provided at one end of the unit sheet forming device close to the third pair of roller devices (10). The guide roller device is a cavity structure. The guide roller device comprises a rotatable outer cylinder (505). The outer cylinder (505) is provided with a vent hole (506). The unit sheet (105) bypasses the first guide roller device (5) so that the first surface of the unit sheet is in contact with the outer wall of the outer cylinder (505) of the first guide roller device (5). A first cover body (501) and a second cover body (502) in contact with the inner wall of the outer cylinder (505) are provided in the guide roller device. The first cover body (501) and the second cover body (502) are provided with a vent port (504). A first heating device (503) is provided in the first cover body (501). An arc plate (6) is provided on the outer side of the first guide roller device (5). A rollable continuous pressure roller (601) is provided on the inner side of the arc plate (6). A second heating device (602) is provided in the arc plate (6).

2. The preparation device of the radiation shielding plate according to claim 1, characterized in that: The fabric dipping device comprises a slurry pool (1), a fabric unwinding device (101) and a first pair of roller devices (2); the fabric unwinding device (101) and the dipping guide wheel (102) are rotatable; a dipping guide wheel (102) is provided in the slurry pool (1); the first pair of roller devices (2) is provided on a side close to the second pair of roller devices (4); the first pair of roller devices (2) have two parallel and spaced-apart pressure rollers; the fabric (104) passes around the dipping guide wheel (102) from below to be immersed in the slurry pool (1); one end of the fabric (104) passes through the gap between the pressure rollers of the first pair of roller devices (2).

3. The preparation device of the radiation shielding plate according to claim 1, characterized in that: A row nozzle (9) is provided between the first guide roller device (5) and the second guide roller device (8), and the row nozzle (9) is used to spray filling glue onto the first surface of the unit sheet. A second guide roller device (8) is also provided on one side of the first guide roller device (5). The unit sheet (105) passes around the first guide roller device (5) and the second guide roller device (8) in sequence, and the second surface of the unit sheet is in contact with the outer wall of the outer cylinder (505) of the second guide roller device (8). A second cover body (502) is provided on the inner side of the contact point between the unit sheet (105) and the outer cylinder (505) of the second guide roller device (8), and the second cover body (502) is in contact with the inner wall of the outer cylinder (505) of the second guide roller device (8).

4. The preparation device of the radiation shielding plate according to claim 1, characterized in that: The first guide roller device (5) further comprises a drum frame (508), the outer wall of the drum frame (508) being sleeved with a plurality of sliding rings (510), the sliding rings (510) being slidably sleeved with the inner wall of the outer drum (505), the drum frame (508) being provided with a plurality of hollow grooves (509) along the circumferential direction, the first cover body (501) and the second cover body (502) being arranged in the hollow grooves (509), a gear ring (511) being provided on the inner wall of one end of the outer drum (505), a through groove (513) being provided on the side wall of one end of the drum frame (508), and a driving motor (512) being further provided on one end of the drum frame (508), a gear being provided on the shaft end of the driving motor (512), the gear passing through the through groove (513) to mesh with the gear ring (511).

5. The preparation device of the radiation shielding plate according to claim 1, characterized in that: The outer wall of the outer cylinder (505) is bonded with a plurality of air dividing plates (514), which are connected end to end to form a full circular structure. The air dividing plates (514) are hard multi-porous structures. The outer wall of the outer cylinder (505) is provided with a plurality of air grooves (507) arranged in parallel and spaced apart along the circumferential direction, and the air grooves (507) are connected to the air holes (506).

6. The preparation device of the radiation shielding plate according to claim 1, characterized in that: The pressing device (12) comprises a frame (1201), a receiving box (1202) is provided at the lower end of the frame (1201), and a pressing plate (1203) is also provided. A guide rod (1204) is provided at the upper end of the pressing plate (1203), and the guide rod (1204) is slidably connected to the frame (1201). A linear drive device (1205) is also provided at the upper end of the frame (1201), and the linear drive device (1205) drives the pressing plate (1203) to move up and down.

7. The method for preparing the radiation shielding plate according to claim 3, characterized in that: The fabric (104) is transported to a slurry pool (1) to be soaked in slurry, wherein the slurry comprises 1-5 parts of quartz powder, 2-8 parts of fly ash, 3-10 parts of reinforcing fiber, 6-10 parts of sulphoaluminate cement, 65-80 parts of barium sulfate, 5-10 parts of zinc powder, 3-5 parts of sodium silicate, 5-8 parts of phosphogypsum, 0.12-0.48 parts of water glass, and 0.3-1.2 parts of zeolite powder; Preliminary compaction and extrusion of excess slurry by a first pair of rollers (2); Using a second pair of rollers (4) to press the fabric (104) on both sides of the metal mesh (103) to form a unit sheet (105), and the second pair of rollers (4) preheating the unit sheet (105); The unit sheet (105) is transferred to the first guide roller device (5) and bypasses the first guide roller device (5), a single-side vacuum dehydration is performed on the first side of the unit sheet, and the continuous pressing roller (601) further compacts the unit sheet (105); The row nozzle (9) sprays the filling glue onto the first surface of the unit chip; The unit sheet (105) passes around the second guide roller device (8), and the second side of the unit sheet is subjected to single-side vacuum dehydration, and the filling glue is sucked into the crack gap (108); The third pair of rollers (10) further presses the unit sheets (105) on the first unit sheet forming device and the second unit sheet forming device to form a composite blank (106); Cutting the composite blank (106) into a predetermined shape; A plurality of composite blanks (106) are sprayed with filling glue on both sides and then stacked and placed, and a pressing device (12) performs final pressing on the composite blanks (106) to form a shielding plate.

Images