Process for producing a radiation protection panel

Abstract

This invention discloses a radiation protection board production process, including the following steps: 1. Pulping: 5% fiber material is pumped into a pulping machine, then 72% lead- and barium sulfate mineral mortar is added and ground into powder, 23% 425 cement is added, and finally 108 adhesive for improving function is added to prepare the materials; the materials are fully mixed in a mixer to form a slurry, which is then sent to a slurry storage tank for later use; 2. Board making and stacking: the slurry in the storage tank is pumped quantitatively and evenly into an industrial blanket by a pump to filter and dewater, and then the water is removed by a vacuum pump, forming a thin layer that is wound onto a forming cylinder. When the set board thickness is reached after multiple layers of winding, the control system automatically cuts the board according to the board design dimensions; standard boards are stacked using a stacking machine, with one steel template per board to ensure the board is flat; 3. Board pressing: the formed board is pressed by a 7000t press for 30 minutes, so that the board is dehydrated and compacted under a high pressure of 23.5MPa to improve the strength and density of the board.

Description

Technical Field

[0001] This invention relates to the field of radiation protection panel manufacturing technology, specifically to a radiation protection panel manufacturing process. Background Technology

[0002] With the development of modern science, radiation, as a new technology, has been widely applied to various sectors of the national economy. To avoid the harm these rays cause to the human body, research on radiation protection has been continuously developing. Currently, the following types of radiation shielding panels are used: lead plates (Pb1), with a density of 11.34 g / cm³, are not easily damaged under radiation, but are expensive, have extremely poor structural strength, are not resistant to high temperatures, and are easily oxidized; steel (cast iron) plates, with a density of 7.85 g / cm³ (7.3 g / cm³), have high mechanical properties, are easy to process, and are relatively inexpensive, but their protective performance is poor, and they are heavier than lead plates at the same attenuation factor; ordinary concrete, with a density of 2.43 g / cm³, has good structural performance and is inexpensive, but is bulky and limited in fixing protective barriers; barium-based fiber (or artificial marble) shielding panels have complex formulas, require advanced process equipment, and are relatively expensive to manufacture. Furthermore, the production processes for these shielding panels are relatively troublesome and complex. Therefore, a radiation shielding panel production process is designed to address this situation. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the above-mentioned technology and provide a radiation protection plate manufacturing process.

[0004] To solve the above-mentioned technical problems, the technical solution provided by the present invention is a radiation shielding plate manufacturing process, which includes the following steps:

[0005] 1. Pulping: Pump 5% of fiber material into a pulper, then add 72% lead- and barium sulfate mineral mortar and grind it into powder, add 23% 425 cement, and finally add 108 adhesive to improve the function and prepare the materials; the materials are thoroughly mixed in a mixer to make slurry and sent to a slurry storage tank for later use.

[0006] II. Slab Forming and Stacking: The slurry in the storage tank is pumped quantitatively and evenly onto an industrial blanket for filtration. After dewatering, the slurry is removed by a vacuum pump and then a thin layer is formed and wound onto the forming cylinder. When the set slab thickness is reached after multiple layers of winding, the control system automatically cuts the slab according to the slab design dimensions. Standard slabs are stacked using a stacker, with one steel template per slab to ensure the slabs are flat.

[0007] III. Sheet pressing: The formed slab is pressed by a 7000t press for 30 minutes to dehydrate and densify the slab under a high pressure of 23.5MPa to improve the strength and density of the sheet.

[0008] IV. Pre-curing and demolding:

[0009] 1. After the wet billets are stacked, they undergo a period of pre-curing to allow the billets to reach their early strength, which facilitates mechanical demolding and stacking. The curing temperature is 50-70℃ and the time is 4-5 hours.

[0010] 2. The pre-cured slabs are sent to the demolding machine, demolded, stacked, and then proceed to the next process—steam curing pad operation;

[0011] 3. The demolded templates are cleaned of dust by a water-based oiling machine, then oiled and stacked on a trolley, returning to the stacker crane along the track for reuse; the slabs are then transferred to the autoclaving process by a transfer car.

[0012] V. Steam and pressure curing:

[0013] 1. After demolding, the slab on the steam trolley is pulled into the autoclave by the traction machine for autoclaving for 24 hours at a pressure of 1.28 MPa and a temperature of 190℃.

[0014] 2. The autoclaving criteria are: heating for 3-4 hours, holding at that temperature for 14-16 hours, cooling for 3-4 hours, and maintaining a constant pressure of 1.28 MPa;

[0015] VI. Demolding and Drying:

[0016] 1. The steam-cured slabs need to be dried. The slabs are continuously dried in a tunnel using a dryer. The hot air is circulated in the kiln by an axial flow fan, so that the slabs are dried evenly and the moisture content is reduced to below 9.5% to meet production requirements.

[0017] 2. After the dryer discharges the plates, the plates are unloaded by the discharge belt conveyor, positioning roller conveyor and vacuum suction machine, stacked into blocks, and then transported to the semi-finished product storage area by forklift;

[0018] 7. Sanding, edge grinding, and improving appearance quality: After drying, the slabs need to be sanded to a certain thickness using a single-sided or double-sided sander. After sanding, the slabs are then ground and chamfered using an edge grinding and chamfering machine.

[0019] As an improvement, the plate-making machine in step two uses a forming cylinder of 1220mm×1220mm or 1220mm×2420mm. After the blank is cut and trimmed laterally, it becomes a standard plate of two sizes: 1200mm×1200mm or 1200mm×2400mm. The thickness of the two sizes of blanks is 12mm and 15mm, respectively.

[0020] The advantages of this invention compared with the prior art are as follows: the radiation protection effect of the 12mm thick radiation protection plate produced by this process can reach ≥1mmpb, and the radiation protection effect of the 15mm thick radiation protection plate can reach ≥1.3mmpb; physical characteristics: diagonal error ≤2mm, flatness ≤0.2mm, density >2.4g / cm³, and non-combustible Class A material;

[0021] This radiation shielding board is a new type of radiation protection material designed and researched based on the characteristics of lead. It has the features of low cost, easy construction, good protective effect, energy saving and environmental protection.

[0022] The radiation protection board has a simple and flexible processing technology, requires little investment, and is suitable for industrial production. It controls the temperature and moisture content of the slurry during the board preparation process, preventing sticking and falling off. Temperature changes and moisture content control during steam curing can prevent board delamination and cracking. This improves the product yield and reduces costs. Detailed Implementation

[0023] The following detailed description of a radiation protection panel manufacturing process according to the present invention is provided in conjunction with embodiments.

[0024] A radiation shielding panel manufacturing process includes the following steps:

[0025] 1. Pulping: Pump 5% of fiber material into a pulper, then add 72% lead- and barium sulfate mineral mortar and grind it into powder, add 23% 425 cement, and finally add 108 adhesive to improve the function and prepare the materials; the materials are thoroughly mixed in a mixer to make slurry and sent to a slurry storage tank for later use.

[0026] II. Slab Forming and Stacking: The slurry in the storage tank is pumped quantitatively and evenly onto an industrial blanket for filtration. After dewatering, the slurry is removed by a vacuum pump and then a thin layer is formed and wound onto the forming cylinder. When the set slab thickness is reached after multiple layers of winding, the control system automatically cuts the slab according to the slab design dimensions. Standard slabs are stacked using a stacker, with one steel template per slab to ensure the slabs are flat.

[0027] III. Sheet pressing: The formed slab is pressed by a 7000t press for 30 minutes to dehydrate and densify the slab under a high pressure of 23.5MPa to improve the strength and density of the sheet.

[0028] IV. Pre-curing and demolding:

[0029] 1. After the wet billets are stacked, they undergo a period of pre-curing to allow the billets to reach their early strength, which facilitates mechanical demolding and stacking. The curing temperature is 50-70℃ and the time is 4-5 hours.

[0030] 2. After pre-curing, the slabs are sent to the demolding machine, demolded, stacked, and then proceed to the next process—steam curing pad operation;

[0031] 3. The demolded templates are cleaned of dust by a water-based oiling machine, then oiled and stacked on a trolley, returning to the stacker crane along the track for reuse; the slabs are then transferred to the autoclaving process by a transfer car.

[0032] V. Steam and pressure curing:

[0033] 1. After demolding, the slab on the steam trolley is pulled into the autoclave by the traction machine for autoclaving for 24 hours at a pressure of 1.28 MPa and a temperature of 190℃.

[0034] 2. The autoclaving criteria are: heating for 3-4 hours, holding at that temperature for 14-16 hours, cooling for 3-4 hours, and maintaining a constant pressure of 1.28 MPa;

[0035] VI. Demolding and Drying:

[0036] 1. The steam-cured slabs need to be dried. The slabs are continuously dried in a tunnel using a dryer. The hot air is circulated in the kiln by an axial flow fan, so that the slabs are dried evenly and the moisture content is reduced to below 9.5% to meet production requirements.

[0037] 2. After the dryer discharges the plates, the plates are unloaded by the discharge belt conveyor, positioning roller conveyor and vacuum suction machine, stacked into blocks, and then transported to the semi-finished product storage area by forklift;

[0038] 7. Sanding and edge grinding to improve appearance quality: After drying, the slabs need to be sanded to a certain thickness using a single-sided or double-sided sander. After sanding, the slabs are then ground and chamfered by an edge grinding and chamfering machine.

[0039] The plate making machine uses a forming cylinder of 1220mm x 1220mm or 1220mm x 2420mm. After the blank is cut and trimmed laterally, it is made into two standard plates of 1200mm x 1200mm or 1200mm x 2400mm. The thickness of the two sizes of blanks is 12mm and 15mm respectively.

[0040] In specific implementation of this invention:

[0041] 1. Pulping: Pump 5% of fiber material into a pulper, then add 72% lead- and barium sulfate mineral mortar and grind it into powder, add 23% 425 cement, and finally add 108 adhesive to improve the function and prepare the materials; the materials are thoroughly mixed in a mixer to make slurry and sent to a slurry storage tank for later use.

[0042] II. Slab Forming and Stacking: The slurry in the storage tank is pumped quantitatively and uniformly onto an industrial blanket for filtration. After dewatering, the filtrate is removed by a vacuum pump, and then a thin layer is formed and wound onto a forming cylinder. When the set slab thickness is reached after multiple layers of winding, the control system automatically cuts the slab according to the designed dimensions. The slab forming machine uses a 1220mm x 1220mm or 1220mm x 2420mm forming cylinder. After transverse cutting and trimming, the slabs are made into standard slabs of two sizes: 1200mm x 1200mm or 1200mm x 2400mm, with thicknesses of 12mm and 15mm respectively. The standard slabs are stacked using a stacker, with one steel template per slab to ensure flatness.

[0043] III. Sheet pressing: The formed slab is pressed by a 7000t press for 30 minutes to dehydrate and densify the slab under a high pressure of 23.5MPa to improve the strength and density of the sheet.

[0044] IV. Pre-curing and demolding:

[0045] 1. After the wet billets are stacked, they are pre-cured in an environment with a temperature of 50-70℃ for 4-5 hours to allow the billets to reach the early strength, so as to facilitate mechanical demolding and stacking.

[0046] 2. The pre-cured slabs are sent to the demolding machine, demolded, stacked, and then proceed to the next process—steam curing pad operation;

[0047] 3. The demolded templates are cleaned with a water brushing machine, brushed with oil, and then stacked on a trolley and returned to the stacker crane for reuse along the track; the slabs are then transferred to the autoclaving process by a transfer car.

[0048] V. Steam and pressure curing:

[0049] 1. After demolding, the slab on the steam trolley is pulled into the autoclave by the traction machine for autoclaving for 24 hours at a pressure of 1.28 MPa and a temperature of 190℃.

[0050] 2. The autoclaving criteria are: heating for 3-4 hours, holding at that temperature for 14-16 hours, cooling for 3-4 hours, and maintaining a constant pressure of 1.28 MPa;

[0051] VI. Demolding and Drying:

[0052] 1. The steam-cured slabs need to be dried. The slabs are continuously dried in a tunnel using a dryer. The hot air is circulated in the kiln by an axial flow fan, so that the slabs are dried evenly and the moisture content is reduced to below 9.5% to meet production requirements.

[0053] 2. After the dryer discharges the plates, the plates are unloaded by the discharge belt conveyor, positioning roller conveyor and vacuum suction machine, stacked into blocks, and then transported to the semi-finished product storage area by forklift;

[0054] 7. Sanding and edge grinding to improve appearance quality: After drying, the slabs need to be sanded to a certain thickness using a single-sided or double-sided sander. After sanding, the slabs are then ground and chamfered by an edge grinding and chamfering machine.

[0055] The radiation protection panels we produce are used in various fields, including medical radiation protection for medical radiation devices and sources, industrial radiation protection for radiation devices and sources, and radiation protection in other industries and fields.

[0056] The present invention and its embodiments have been described above. This description is not restrictive, and the embodiments described are merely one example of the invention's implementation; the invention is not actually limited thereto. In conclusion, if those skilled in the art are inspired by this description and, without departing from the spirit of the invention, design similar methods and embodiments without creative effort, all such designs should fall within the protection scope of the present invention.

Claims

1. A process for the production of a radiation protection panel, characterized in that: The method comprises the following steps: I. pulp preparation: 5% fiber material is pumped into a beater, 72% lead-containing, barium sulfate-containing sand slurry is added to be ground into powder, 23% cement is added, and finally 108 glue is added to improve the function to prepare the material; the material is fully stirred in the mixer to prepare the slurry, which is sent to the slurry storage tank for standby; II. plate preparation and stacking: the slurry in the slurry storage tank is pumped by the pump into an industrial blanket for water filtration, and after dehydration, the water is filtered by a vacuum pump, then a thin material layer is formed and wound on a forming cylinder, when the set plate thickness is reached, the control system automatically cuts off the plate according to the designed size of the plate; the standard plate is stacked by a stacking machine, and the stacking is in the form of one steel template and one plate to ensure the flatness of the plate; III. plate pressing: the formed plate is pressed by a 7000t press for 30min, so that the plate is dehydrated and compacted under a high pressure of 23.5MPa to improve the strength and compactness of the plate; IV. pre-curing and demolding:

1. after the wet plate is stacked, it is pre-cured for a period of time to reach the early strength, which is beneficial to mechanical demolding and stacking, the curing temperature is 50-70℃, and the time is 4-5h; 2. the pre-cured plate is sent to the demolding machine, and is demolded, stacked and enters the next process of cushion plate operation; 3. the demolded template is cleaned by a water and oil cleaning machine, and is stacked on a trolley after oiling, and is returned to the stacking machine along the track for recycling; the plate is transferred to the autoclaving process by a transfer vehicle; V. autoclaving curing:

1. after the plate is demolded, the plate on the steam trolley is pulled into the autoclaving machine by a pulling machine for autoclaving and curing for 24h, the pressure is 1.28MPa, and the temperature is 190℃; 2. the autoclaving criterion is: 3-4h for temperature rising, 14-16h for constant temperature, 3-4h for temperature falling, and the constant pressure is 1.28MPa; VI. demolding and drying:

1. the autoclaved plate is treated by drying, and is continuously dried in a tunnel by a drying machine, hot air is circulated in the kiln by an axial flow fan, and the plate is uniformly dried, so that the moisture of the plate is reduced to below 9.5% to meet the production requirements; 2. the plate discharged from the drying machine is unloaded and stacked into blocks by a plate unloading belt conveyor, a positioning roller conveyor and a vacuum plate suction machine, and is sent to the semi-finished product storage area by a forklift; VII. sanding, edge grinding and appearance quality improvement: the dried plate needs to be thicknessed by a single-sided or double-sided sander, and the sanded plate is ground and chamfered by an edge grinding and chamfering machine.

2. A process for the production of a radiation protection panel according to claim 1, characterized in that: Step II uses a forming cylinder with a size of 1220mm x 1220mm or 1220mm x 2420mm, and the plate is cut and edged in the transverse direction to form standard plates with sizes of 1200mm x 1200mm or 1200mm x 2400mm, and the thicknesses of the two sizes of plates are 12mm and 15mm respectively.