Radiation shielding method for plate transmission

Abstract

The present invention discloses a radiation shielding method for plate transport, comprising: providing a radiation shielding device containing multiple shielding doors on the input and output sides of an irradiation zone; and controlling the opening state of the multiple shielding doors in the radiation shielding device so that when the radiation shielding device is in an operating state, at least one door in each radiation shielding device is in a closed state, thereby shielding radiation from the irradiation zone. The present invention provides a radiation shielding method for plate transport, comprising: providing multiple shielding doors in the radiation shielding device; and controlling the opening state of each door during plate transport so that, within a shielding channel constructed by the radiation shielding device, at least one door is in a completely closed state in any transport state, thereby achieving radiation shielding within the channel. The method can be used for the transport and radiation shielding of large plates as well as other small plates.

Description

Technical Field

[0001] The present invention relates to the field of radiation irradiation, and more particularly to a radiation shielding method for transmitting radiation through a plate material used in radiation curing. Background Art

[0002] During electron beam curing, X-rays are generated that are harmful to the environment and operators, and leakage must be strictly prevented. A labyrinthine structure is typically used to allow the X-rays to refract several times before reaching the outside environment, essentially meeting national standards. However, for relatively rigid sheet materials, which cannot bend, the labyrinthine structure's transmission method is complex, requires a large footprint, has a low duty cycle (less than 50%), and is expensive, hindering the widespread application of electron beam curing in the sheet metal industry.

[0003] In the existing technology, many manufacturers have adopted methods to reduce floor space or increase the duty cycle. For example, the patent "An Electron Beam Radiation Shielding Device Based on Continuous Production" uses a method of repeatedly opening and closing the transmission channel, significantly shortening the channel length. Only slightly longer than the plate can achieve radiation shielding and transmission, which is low-cost. However, the disadvantage is a very low duty cycle, less than 50%, because the shielding channel exit must be closed after the plate completely leaves the shielding channel before the entrance can be opened to allow the next plate to enter. As a result, the duty cycle is very low, and the electron beam utilization is very low.

[0004] One of the patents, "A Rotating Door-Type Corner Electron Beam Curing Shielding Device for Panels," utilizes a rotating baffle to increase the duty cycle to approximately 70%. However, the disadvantage is that it requires a large footprint, with the disc diameter approximately three times the length of the panel. For a typical panel measuring 2400mm by 1000mm, the disc diameter would be at least six meters, making it very large and requiring a significant footprint.

[0005] Another patent, "CN213325236U - Radiation Shielding Transmission Device", has an extremely high duty cycle. However, due to the use of elastic lead-containing materials in the radiation shielding device, there is friction with the inner wall of the radiation shielding channel during movement. It is a wearing part and needs to be replaced regularly. The replacement cycle is slightly short. In addition, due to the reciprocating chain movement, the height space is large. Another point is that when the electron beam energy is high, the required lead-containing elastomer is thicker, which occupies a larger space and increases more friction, reducing efficiency and increasing cost. It is not suitable for occasions where the electron beam energy is greater than 300keV.

[0006] None of the above technologies can take into account the defects of low duty cycle and large size, and an effective solution is urgently needed. Summary of the Invention

[0007] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages which will be described hereinafter.

[0008] In order to achieve these objects and other advantages of the present invention, a radiation shielding method for plate transmission is provided, wherein a radiation shielding device including multiple shielding doors is respectively provided on the input side and the output side of the irradiation zone;

[0009] By controlling the opening state of multiple shielding doors in the radiation shielding device, when the radiation shielding device is in working state, at least one door in each radiation shielding device is in a closed state, so as to shield the radiation in the irradiation area.

[0010] Preferably, the length of each radiation shielding device is configured to be greater than the length of the plate to be transported.

[0011] Preferably, the shielding doors in each radiation shielding device are configured to include at least three;

[0012] The spacing between two adjacent shielding doors is configured to be smaller than the spacing between the front and rear plates, and the spacing between the front and rear plates is configured to be smaller than the length of the plates.

[0013] Preferably, the shielding door in each radiation shielding device is configured to include three doors;

[0014] The distance between the front and rear plates is configured to be greater than the distance between two adjacent shielding doors, so that there is at least one adjacent shielding door between the front and rear plates, and at least one shielding door is in a fully closed state.

[0015] Preferably, in each radiation shielding device, each shielding door is switched between an open and a closed state by a corresponding power mechanism;

[0016] Among them, a sensing mechanism connected to the controller is set at the position corresponding to each shielding door, and the controller is communicatively connected with each power mechanism.

[0017] Preferably, the workflow of providing four shielding doors in each radiation shielding device includes:

[0018] S1, by controlling the transmission spacing of the plates to be transmitted on the external first transmission mechanism, the transmission spacing is made so that the spacing between adjacent plates is larger than the spacing between two adjacent shielding doors in the radiation shielding device, so that when the radiation shielding device is transmitted, there is at least one adjacent shielding door between the front and rear plates, and at least one shielding door is in a fully closed state;

[0019] S2: The plate to be transported is transported to the entrance of the radiation shielding passage via the first transport mechanism. The sensor mechanism on the first shielding door senses the plate to be transported and transmits a corresponding signal to the controller. The controller queries the status of the second shielding door. If the second shielding door is fully closed, the controller opens the first shielding door, and the plate enters the interior of the radiation shielding passage.

[0020] S3, the plate moves through the second transmission mechanism in the radiation shielding device to the second shielding door. The sensor mechanism on the second shielding door senses the plate and transmits a corresponding signal to the controller. The controller queries the status of the third shielding door. If the third shielding door is in a fully closed state, the controller opens the second shielding door, and the plate is transported by the second transmission mechanism to penetrate into the interior of the radiation shielding device.

[0021] S4, the plate moves to the third shielding door via the second transmission mechanism. The sensor mechanism on the third shielding door senses the plate and transmits a corresponding signal to the controller. The controller queries the status of the fourth shielding door. If the fourth shielding door is in a fully closed state, the controller opens the third shielding door.

[0022] S5, the plate moves to the fourth screen door via the second transmission mechanism. The sensor mechanism on the fourth screen door senses the plate and transmits a corresponding signal to the controller. The controller queries the status of the first screen door. If the tail of the plate leaves the first screen door by a predetermined distance, the first screen door is closed. When the first screen door is in a fully closed state, the controller opens the fourth screen door.

[0023] S6, when the tail of the plate leaves the second shielding door and reaches a preset distance, the second shielding door is closed;

[0024] S7, when the tail of the plate leaves the third shield door and reaches a preset distance, the third shield door is closed;

[0025] S8, when the tail of the plate leaves the fourth shielding door to reach a preset distance, the fourth shielding door is closed.

[0026] Preferably, in the radiation shielding device, each shielding door is configured to adopt a side-opening shielding door;

[0027] The side-opening screen door is configured to include:

[0028] A first fixing plate having a first rectangular hole;

[0029] A first rotating plate is rotatably disposed on one side of the first fixed plate, wherein the size of the first rotating plate is configured to be larger than the size of the first rectangular hole;

[0030] Wherein, the first rotating plate is configured to include a first rectangular plate and a first rotating shaft provided on a long side of the first rectangular plate;

[0031] Both ends of the first rotating shaft are respectively provided with matching first disc plates;

[0032] The first fixing plate has a shielding plate on one side that matches the mounting surface, the shielding plate is provided with a circular step that matches the first disc plate, and a through hole is provided in the shielding plate for the rotating shaft to extend out;

[0033] The first fixing plate is provided with a protruding first rectangular step on one side that matches the first rectangular plate, and the first rectangular plate is provided with a second rectangular step on one side that matches the first fixing plate, and the first rectangular step and the second rectangular step are staggered and overlapped in space;

[0034] A counterweight is provided on the other side of the first rotating shaft opposite to the first rectangular plate.

[0035] Preferably, in the radiation shielding device, each shielding door is configured to adopt a rotary shielding door;

[0036] The revolving screen door is configured to include:

[0037] Two second fixing plates are arranged opposite to each other, each second fixing plate is provided with a matching second rectangular hole;

[0038] a second rotating plate rotatably disposed between the two second fixed plates, wherein the size of the second rotating plate is configured to be larger than the size of the second rectangular hole;

[0039] Wherein, the second rotating plate is configured to include a second rectangular plate and a second rotating shaft arranged at the center position of the second rectangular plate;

[0040] The two ends of the second rotating shaft are respectively provided with second disc plates that match the second rectangular plate;

[0041] The diameter of the second disc plate is configured to be larger than the diameter of the disc plate;

[0042] The distance between the two second fixing plates is configured to be larger than the diameter of the second disc plate.

[0043] Preferably, when a rotary shielding door is used in the radiation shielding device, an isolation area is provided outside the shielding door at one end of the radiation shielding device away from the irradiation area.

[0044] Preferably, in the radiation shielding device, each shielding door is configured to adopt a lifting shielding door;

[0045] The lifting screen door is configured to include:

[0046] Two third fixing plates are arranged opposite to each other, each of which is provided with a matching third rectangular hole;

[0047] A movable plate is arranged between the two third fixed plates in a liftable manner, wherein the size of the movable plate is configured to be larger than the size of the third rectangular hole;

[0048] Wherein, each third rectangular hole is provided with a third rectangular step at a position matching the extended side of the movable plate;

[0049] The movable plate is provided with a fourth rectangular step which is staggered and overlapped with the third rectangular step.

[0050] The present invention has at least the following beneficial effects:

[0051] First, the present invention sets multiple shielding doors in the radiation shielding device to control the opening state of each door when the plate is transmitted, so that in the shielding channel constructed by the radiation shielding device, by ensuring that at least one door is in a completely closed state in any transmission state, radiation shielding in the channel is achieved. It can be used for the transmission and radiation shielding of large plates and other small plates. In application, the length of the radiation shielding channel can be set to be slightly larger than the length of the plate to achieve radiation shielding in the radiation shielding channel. It has a small footprint and its duty cycle can exceed 50%. Through the design of multiple doors in the channel, its duty cycle can reach more than 90%, and it has the effects of high electron beam utilization and high irradiation efficiency.

[0052] Secondly, the present invention further cooperates with the structural design of the shielding door, so that when it is used in the field of radiation shielding, there are no vulnerable parts such as lead-containing elastomers inside the device, the maintenance cycle interval is long, the space is small, and the structure is simple and the cost is controllable.

[0053] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 A schematic side view of the structure of a radiation shielding device in one embodiment of the present invention;

[0055] Figure 2 This is a side view schematic diagram of the structure of the entire plate in the radiation shielding device;

[0056] Figure 3 It is a schematic diagram of the top view of the structure of the radiation shielding device;

[0057] Figure 4 This is a schematic diagram of the irradiation system structure using a radiation shielding device;

[0058] Figure 5 A schematic diagram of calculating the duty cycle of a ray shielding channel using four shielding doors in one embodiment of the present invention;

[0059] Figure 6 A schematic diagram of calculating the duty cycle of a ray shielding channel using seven shielding doors in another embodiment of the present invention;

[0060] Figure 7 A schematic structural diagram of a side-opening screen door according to another embodiment of the present invention;

[0061] Figure 8 This is a structural schematic diagram of applying a side-opening shielding door to a radiation shielding device in another embodiment of the present invention;

[0062] Figure 9 A schematic structural diagram of a rotary screen door according to another embodiment of the present invention;

[0063] Figure 10 for Figure 9 A schematic diagram of the partially enlarged structure of the medium-sized rotary screen door when in use;

[0064] Figure 11 This is a structural schematic diagram of applying a rotary shielding door to a radiation shielding system in another embodiment of the present invention;

[0065] Figure 12 This is a schematic diagram of a first embodiment of a method of applying a lifting shielding door to a radiation shielding device in another embodiment of the present invention;

[0066] Figure 13 for Figure 12 The enlarged schematic diagram of the structure in the dotted box;

[0067] Figure 14 This is a schematic diagram of a second embodiment of the present invention, in which a lifting shielding door is applied to a radiation shielding device;

[0068] Figure 15 for Figure 14 An enlarged schematic diagram of the structure of the central power mechanism and the lifting screen door;

[0069] Figure 16 For Figure 15 Schematic diagram of scheme three obtained by replacing the power. DETAILED DESCRIPTION

[0070] The present invention will be described in further detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0071] It should be understood that terms such as “having,” “including,” and “comprising” used herein do not prescribe the existence or addition of one or more other elements or combinations thereof.

[0072] It should be noted that in the description of the present invention, the orientations or positional relationships indicated by terms are based on the orientations or positional relationships shown in the accompanying drawings. These are intended solely to facilitate and simplify the description of the present invention and do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0073] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installed", "provided with", "sleeved / connected", "connected", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or an indirect connection through an intermediate medium. It can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] Figure 1-3 The embodiment of the present invention shows a method for shielding radiation transmitted by a plate, wherein the structure thereof may include a plate 1, a transmission roller 2, a radiation shielding device 3, a first shielding door 4, a second shielding door 5, a third shielding door 6, a fourth shielding door 7, an irradiation area 8, and an electron beam generator 9:

[0075] From the perspective of layout, radiation shielding devices with multiple shielding doors are installed on the input and output sides of the irradiation area;

[0076] By controlling the opening status of multiple shielding doors in the radiation shielding device, at least one door in each radiation shielding device is closed when the radiation shielding device is in operation, thereby shielding the radiation in the irradiation area. In this solution, by providing multiple shielding doors in the radiation shielding channel, the opening or closing status of each door can be controlled when the plate is transferred, thereby shielding the radiation on the input side and the side exit side of the irradiation area. This can relatively reduce the footprint of the radiation shielding device during the radiation irradiation process. At the same time, during this process, as long as at least one shielding door is in a fully closed state, the X-rays in the irradiation area will be completely shielded and will not pass through the shielding channel constructed by the radiation shielding device to reach the environment outside the entrance or exit. That is, during operation, as long as at least one shielding door in the entire radiation shielding channel is always in a fully closed state, it can be ensured that the X-rays in the irradiation area will not leak through the radiation shielding channel to the environment outside the entrance or exit of the radiation shielding channel.

[0077] In another example, the length of each radiation shielding device is configured to be greater than the length of the plate to be transported. In actual application, the distance between the shielding doors at both ends of the radiation shielding device is greater than the length of the plate, ensuring that when the plate is completely inside the shielding channel constructed by the radiation shielding device, the shielding doors at both ends can be in a fully closed state at the same time.

[0078] In another example, the shielding door in each radiation shielding device is configured to include at least three doors;

[0079] Among them, the spacing between two adjacent shielding doors is configured to be smaller than the spacing between the front and rear plates, and the spacing between the front and rear plates is configured to be smaller than the length of the plates. In actual application, the radiation shielding channel includes at least three shielding doors to ensure that the spacing between the front and rear plates is slightly larger than the spacing between two adjacent shielding doors and much smaller than the length of the plates, so that the duty cycle of the plates can exceed 50%.

[0080] In another example, the shielding door in each radiation shielding device is configured to include three doors;

[0081] Among them, the distance between the front and rear plates is configured to be greater than the distance between two adjacent shielding doors, so that there is at least one adjacent shielding door between the front and rear plates, and at least one shielding door is in a fully closed state. In actual application, the distance between the front and rear plates is greater than the distance between two adjacent shielding doors, ensuring that there is at least one adjacent shielding door between the front and rear plates, and at least one shielding door is in a fully closed state. Furthermore, in application, the more shielding doors there are inside the radiation shielding channel, the shorter the distance between two adjacent shielding doors, and the higher the duty cycle of the plate, which can exceed 90%.

[0082] In another embodiment, in each radiation shielding device, each shielding door is switched between an open and a closed state by a corresponding power mechanism;

[0083] Among them, a sensing mechanism connected to the controller is set at the position corresponding to each shielding door, and the controller is communicated with each power mechanism. In this scheme, the opening of the door is controlled by setting a corresponding power mechanism, and the further opening of the door can be achieved in conjunction with the sensing mechanism. When used, the sensing mechanism can be set on both sides of the door respectively, which can sense the arrival of the plate and the departure of the plate, and can more accurately control the opening and closing of the door. At the same time, further, the closing of the door can also be adjusted by controlling the time gap. The time gap here is correlated with the length of the plate and the transmission speed of the transmission mechanism. The controller in the scheme can obtain the position of the plate through the sensing mechanism, and switch the working state of the door based on this to ensure the automatic operation of the equipment.

[0084] like Figure 1-3 Taking the example of setting four shielding doors in each radiation shielding device, the workflow of the radiation shielding device on the input side of the irradiation area includes:

[0085] The plate 1 is transported by the conveying roller 2 to the entrance of the radiation shielding channel 3. When the distance between the plate 1 and the first shielding door 4 meets the predetermined value, the plate 1 has completely passed through the second shielding door 5, and the second shielding door 5 is in a completely closed state. The first shielding door 4 is opened, and the plate 1 enters the interior of the radiation shielding channel 3.

[0086] When the plate 1 moves to a distance from the second shielding door 5 that meets a predetermined value, at this time, the front plate has completely passed through the third shielding door 6, and the third shielding door 6 is in a fully closed state. The second shielding door 5 is opened, and the plate 1 continues to be transported by the roller 2 into the interior of the radiation shielding channel 3. The distance here meeting the predetermined value means that if the plate movement speed is v, the time required for the shielding door to be fully closed to fully open is t, and the predetermined distance D ≥ v * t. Similarly, the same treatment is performed for the distances of other shielding doors that meet the predetermined values, which will not be described later.

[0087] When the plate 1 moves to a distance from the third shielding door 6 that meets a predetermined value, the plate in front has completely passed through the fourth shielding door 7, and the fourth shielding door 7 is in a completely closed state. The third shielding door 6 is opened, and the plate 1 continues to be transported by the roller 2 deep into the interior of the radiation shielding channel 3.

[0088] When the plate 1 moves to a distance from the fourth shielding door 7 that meets a predetermined value, the tail of the plate 1 has completely passed through the first shielding door 4 of the radiation shielding channel 3, and the first shielding door 4 closes the first shielding door 4 when the tail of the plate 1 leaves the first shielding door 4 to reach a preset distance. After the first shielding door 4 is in a completely closed state, the fourth shielding door 7 is opened, and the plate 1 continues to be transported by the roller 2 through the fourth shielding door 7 and enters the irradiation area 8. The preset distance here is greater than or equal to 0, that is, when the plate 1 just leaves the shielding door, the shielding door can be started to close. The closing of other shielding doors is handled in the same way and will not be described here.

[0089] When the tail of the plate 1 moves away from the second shielding door 5 and reaches a preset distance, the second shielding door 5 is closed. The preset distance at this time is to ensure that there is no collision with the moving plate during the opening and closing process of the shielding door, leaving necessary safety margin, for example: 20 to 50 mm more than the critical position where the plate collides with the shielding door.

[0090] When the tail of the plate 1 moves away from the third screen door 6 and reaches a preset distance, the third screen door 6 is closed.

[0091] When the tail of the plate 1 moves away from the fourth screen door 7 and reaches a preset distance, the fourth screen door 7 is closed.

[0092] At this point, the plate 1 has completed a complete process of passing through the radiation shielding channel 3. In this solution, a predetermined value is used, which is a data obtained based on the length of the plate and the transmission speed, and the working state of each door is switched based on the input value.

[0093] Example 1, as Figure 4 As shown, two sets of radiation shielding channel devices are placed on both sides of the electron beam irradiation processing area. The plate enters from the radiation shielding channel on one side and is transferred to the electron beam irradiation processing area. The surface coating is cured by electron beam radiation. Then, it is transported to the external production line through the radiation shielding channel on the other side. The X-rays generated inside the electron beam irradiation processing area are blocked inside by the radiation shielding channels located on both sides of the processing area, realizing continuous radiation curing production of the plate.

[0094] Example 2, as Figure 5 As shown, the radiation shielding channel includes a structure of 4 shielding doors, the radiation shielding channel length is 2500 mm, the plate length L = 2400 mm, the plate spacing d = 900 mm, and the duty cycle is 73%.

[0095] Example 3, as Figure 6 As shown, the radiation shielding channel includes a structure of 7 shielding doors, the radiation shielding channel length is 2500 mm, the plate length L=2400 mm, the plate spacing d=480 mm, and the duty cycle is 83%.

[0096] In another solution, the switching of each door can also be achieved by the sensor mechanism set on the door. The working principle is that each shielding door is respectively provided with a matching sensor mechanism to sense whether the plate has arrived or left the door position, so as to control the power mechanism to open when the plate arrives, so that the plate can pass smoothly, and when the plate leaves, the door is quickly closed to play the role of radiation isolation. The sensing mechanism here can be a light sensor, and its number can be set on both sides of the door as needed. When the light is blocked, it proves that the plate has arrived or is being transmitted, and when it is not blocked, it is determined that the plate has left. The working process is as follows:

[0097] S1, by controlling the transmission spacing of the plates to be transmitted on the external first transmission mechanism, the transmission spacing is made so that the spacing between adjacent plates is larger than the spacing between two adjacent shielding doors in the radiation shielding device, so that when the radiation shielding device is transmitted, there is at least one adjacent shielding door between the front and rear plates, and at least one shielding door is in a fully closed state;

[0098] S2: The plate to be transported is transported to the entrance of the radiation shielding passage via the first transport mechanism. The sensor mechanism on the first shielding door senses the plate to be transported and transmits a corresponding signal to the controller. The controller queries the status of the second shielding door. If the second shielding door is fully closed, the controller opens the first shielding door, and the plate enters the interior of the radiation shielding passage.

[0099] S3, the plate moves through the second transmission mechanism in the radiation shielding device to the second shielding door. The sensor mechanism on the second shielding door senses the plate and transmits a corresponding signal to the controller. The controller queries the status of the third shielding door. If the third shielding door is in a fully closed state, the controller opens the second shielding door, and the plate is transported by the second transmission mechanism to penetrate into the interior of the radiation shielding device.

[0100] S4, the plate moves to the third shielding door via the second transmission mechanism. The sensor mechanism on the third shielding door senses the plate and transmits a corresponding signal to the controller. The controller queries the status of the fourth shielding door. If the fourth shielding door is in a fully closed state, the controller opens the third shielding door.

[0101] S5, the plate moves to the fourth screen door via the second transmission mechanism. The sensor mechanism on the fourth screen door senses the plate and transmits a corresponding signal to the controller. The controller queries the status of the first screen door. If the tail of the plate leaves the first screen door by a predetermined distance, the first screen door is closed. When the first screen door is in a fully closed state, the controller opens the fourth screen door.

[0102] S6, when the tail of the plate leaves the second shielding door and reaches a preset distance, the second shielding door is closed;

[0103] S7, when the tail of the plate leaves the third shield door and reaches a preset distance, the third shield door is closed;

[0104] S8, when the tail of the plate leaves the fourth shielding door to reach a preset distance, the fourth shielding door is closed.

[0105] In this way, by introducing a matching sensor mechanism in the opening and closing switching of the door, the switching of the door can be automatically controlled, with better adaptability and automation.

[0106] like Figure 7-8 In another embodiment, in the radiation shielding device, each shielding door is configured to be a side-opening shielding door;

[0107] The side-opening screen door is configured to include:

[0108] A first fixing plate 10 is provided with a first rectangular hole. The first fixing plate is a rectangular frame structure with a rectangular hole in the middle. The hole size is slightly larger than the height and width of the largest plate to ensure that the plate can pass freely.

[0109] A first rotating plate rotatably provided on one side of the first fixed plate is used to switch the communication state between the first rectangular hole and the outside world;

[0110] The size of the first rotating plate is configured to be larger than the size of the first rectangular hole. In actual application, the length and width of the first rotating plate are larger than the length and width of the central rectangular opening of the first fixed plate to ensure that it has a better blocking and shielding effect when used to shield radiation;

[0111] The first rotating plate is configured to include a rectangular plate 11 and a first rotating shaft 12 provided on one long side of the rectangular plate. In practical applications, the first rotating shaft may be an independent structure passing through the rectangular plate, or may be a structure extending from both ends of the rectangular plate. Its function is to cooperate with the installation position of the screen door to achieve spatial limitation of the first rotating plate, and at the same time, cooperate with other structures to achieve unrestricted rotation of the first rotating plate.

[0112] One end of the first rotating shaft is provided with a matching power mechanism 13 (also referred to as a driver), and the power mechanism is connected to the first rotating shaft via a matching connecting rod 13a. In actual application, the first rotating shaft of the first rotating plate extends outside the radiation shielding channel and is driven by a driver, which can be a motor or a cylinder, to perform a 90-degree reciprocating rotation clockwise and counterclockwise. The working process of the shielding door when used for radiation shielding is as follows: when the first rotating plate is closed, it is in an upright state, and the radiation is blocked and absorbed. When the first rotating plate is opened, it is in a horizontal state, and its lower surface is higher than the upper surface of the plate, so the plate can pass through smoothly.

[0113] The two ends of the first rotating shaft are respectively provided with matching first disc plates 14;

[0114] The first fixing plate is provided with a shielding plate on one side that cooperates with the mounting surface. The shielding plate is provided with a circular step 15 that cooperates with the first disc plate. A through hole is provided in the shielding plate for the rotating shaft to extend out. A first disc plate is arranged at each end of the first rotating shaft. The shielding plate is made of lead material and is provided with a circular step that cooperates with the first disc plate. The two are spatially staggered and overlapped to form a ray blocking and absorbing structure, which prevents the radiation from leaking to the outside through the through hole on the first rotating shaft and the shielding plate, and also prevents the radiation from leaking out through the gap between the first rotating shaft and the side wall of the shielding room, thereby ensuring the shielding effect.

[0115] In application, a small gap is kept between the disc plate 1 at the end of the first rotating plate and the side wall of the radiation shielding channel so as not to affect the rotation of the first rotating plate;

[0116] The first fixed plate is provided with a protruding first rectangular step 16 on the side that cooperates with the rectangular plate, and the rectangular plate is provided with a second rectangular step 17 on the side that cooperates with the first fixed plate, and the first rectangular step and the second rectangular step are staggered and overlapped in space. A circle of first rectangular steps is arranged on the edge of one side of the rectangular opening of the first fixed plate close to the first rotating plate, and a circle of second rectangular steps is also arranged on the side of the first rotating plate close to the first fixed plate, which cooperate with the first rectangular step on the first fixed plate to form a staggered overlap structure, forming a ray blocking and absorbing structure to prevent ray leakage;

[0117] A counterweight 13b is provided on the other side of the first rotating shaft opposite to the rectangular plate. In actual application, a first rotating plate counterweight is provided on the other side of the first rotating shaft opposite to the first rotating plate to balance the torque on both sides of the first rotating shaft. If the length of the first rotating shaft is limited, the counterweight can also be installed on the connecting rod.

[0118] like Figure 9-10 In another embodiment, in the radiation shielding device, each shielding door is configured to be a rotating shielding door;

[0119] The revolving screen door is configured to include:

[0120] Two second fixing plates 18 are arranged opposite to each other, each of which is provided with a second rectangular hole that matches the second fixing plate. The second fixing plate is composed of two identical rectangular frames. A second rectangular hole is provided in the middle of the second fixing plate, which is slightly larger than the height and width of the largest plate to ensure that the plate can pass freely.

[0121] A second rotating plate 19 is rotatably arranged between the two second fixed plates. A second rotating plate is arranged between the two second fixed plates to block the position of the second rectangular hole according to the needs of plate transportation;

[0122] The size of the second rotating plate is configured to be larger than the size of the second rectangular hole. In actual application, the length and width of the second rotating plate are both larger than the second rectangular hole in the center of the second fixed plate. When the second rotating plate is closed, it is in an upright state, and a small gap is maintained between the upper and lower ends and the upper and lower inner walls of the radiation shielding channel that does not affect rotation. The radiation can only be scattered and passed through this small gap, and most of it is blocked and absorbed. When the second rotating plate is opened, it is in a horizontal state, and the upper surface is lower than the upper surface of the roller, so that the plate can pass smoothly. At the same time, when used in the field of radiation shielding, the spacing between the second fixed plates is slightly wider than the width of the second rotating plate, which does not affect the movement of the second rotating plate.

[0123] The second rotating plate is configured to include a rectangular plate 20 and a second rotating shaft 21 provided at the center of the rectangular plate. The rectangular plate is structurally designed to cooperate with the second rectangular hole on the second fixed plate. The second rotating shaft is designed so that it can rotate the second rotating plate by applying a force to connect the second rectangular hole with the outside world. In application, the height of the upper surface of the second rotating shaft can be set to be flush with the upper surface of the bottom of the second rectangular hole as needed to limit the height of the second rectangular hole.

[0124] Among them, one end of the second rotating shaft is provided with a matching power mechanism (also called a driver), which is used to apply a rotational power to the second rotating shaft by means of an external force. In actual application, the second rotating shaft of the second rotating plate extends outside the radiation shielding channel and is driven by the driver. The driver can be composed of a motor or a cylinder to perform a 90-degree rotation movement, preferably rotating forward 90 degrees clockwise each time, consistent with the movement direction of the plate, and can perform a 90-degree reciprocating rotation back and forth clockwise and counterclockwise.

[0125] The second rotating shaft is provided with a second disc plate 22 at both ends thereof, which cooperates with the rectangular plate. The second rotating plate is composed of a rectangular plate and a disc plate arranged at each end thereof. The material is lead material. The diameter of the second disc plate is consistent with the width of the rectangular plate, and the second disc plate rotates together with the rectangular plate.

[0126] In actual application, a small gap is retained between the second disc plate at the end of the second rotating plate and the side wall of the radiation shielding channel, so as not to affect the rotation of the second rotating plate. The inner rays need to pass through this small gap before they can be scattered to the outside, and most of them are blocked and absorbed. At the same time, this second disc plate structure also prevents the rays from leaking out of the channel through the second rotating axis of the second rotating plate and the opening on the side wall of the radiation shielding channel.

[0127] The diameter of the second circular disc is configured to be larger than the width of the rectangular plate when placed horizontally;

[0128] The distance between the two second fixed plates is configured to be larger than the diameter of the second disc plate. By limiting the small gap, the operation of each component is smoother and the shielding performance meets the requirements. In specific applications, if a revolving door is used in the radiation shielding device, an isolation area 31 needs to be reserved outside the shielding door away from the irradiation area. Figure 11 As shown, an isolation area is added on the side of the radiation shielding device that is connected to the external environment (i.e., the inlet / outlet of the plate) to block and absorb the radiation leaking from the tiny gap between the rotating plate and the upper / lower wall of the radiation shielding device when the adjacent shielding door is fully closed.

[0129] like Figure 12-16In another embodiment, in the radiation shielding device, each shielding door is configured to adopt a lifting shielding door;

[0130] The lifting screen door is configured to include:

[0131] Two third fixing plates 23 are arranged opposite each other, each of which is provided with a matching third rectangular hole. The third fixing plates are rectangular frame structures and are placed on both sides of the movable plate. The gap is as small as possible so as not to affect the up and down movement of the movable plate. There is a third rectangular hole in the middle of the third fixing plates. The opening size is slightly larger than the length and width of the plate to ensure that the plate can pass freely.

[0132] A movable plate 24 is provided between the two third fixed plates in a liftable manner, and is used to control the communication between the third rectangular hole and the outside through up and down reciprocating motion, thereby controlling the transmission of the plate;

[0133] The size of the movable plate is configured to be larger than the size of the third rectangular hole (not shown). In actual application, the length and width of the movable plate are larger than the length and width of the central rectangular opening of the third fixed plate, so that the third rectangular hole can be completely blocked during operation to prevent radiation leakage, so that it can be adaptably used in radiation shielding scenarios.

[0134] Each third rectangular hole is provided with a third rectangular step 25 at a position matching the extended side of the movable plate;

[0135] The movable plate is provided with a fourth rectangular step 26 that is staggered and overlapped with the third rectangular step. In actual application, a third rectangular step is arranged on the edge of the third fixed plate at the lower end of the third rectangular opening close to one side of the movable plate, and a fourth rectangular step is also arranged on both sides of the lower end of the movable plate between the third fixed plate. In terms of space, the fourth rectangular step cooperates with the fourth rectangular step on the third fixed plate to form a staggered overlapping structure, forming a ray blocking and absorbing structure to shield radiation, prevent radiation from leaking out from the gap between the fixed plate and the movable plate, and at the same time prevent radiation from leaking to the outside through the gap between the push-pull rod 27 and the radiation shielding channel;

[0136] In actual application, there are three ways to use lifting doors:

[0137] Option 1, such as Figure 12-13The power mechanism is set as a motor. According to the needs of the on-site layout, the plate is set above the movable plate (that is, the power mechanism is arranged below the radiation shielding device). One side of the movable plate is connected to the external power mechanism 13 through a matching push-pull rod. During work, the movable plate is connected to the driver by the push-pull rod. The driver drives the movable plate to move up and down. The driver can be implemented by a motor or a cylinder as needed to complete the opening and closing state switching of the door. At the same time, because the size of the movable plate is larger than the third rectangular hole, the third rectangular hole can be safely blocked to achieve radiation shielding.

[0138] Option 2, such as Figure 14-15 The power mechanism is set as a motor. According to the needs of the on-site layout, the plate is set below the movable plate (that is, the power mechanism is arranged above the radiation shielding device), and its working method is consistent with the plan.

[0139] Option three, such as Figure 16 The plate is arranged below the movable plate, and the replacement mode of the power mechanism is expanded. Specifically, the power mechanism is configured to include:

[0140] a chain 28 cooperating with the push-pull rod;

[0141] Sprocket 29 connected to the chain drive;

[0142] A counterweight 30, attached to one end of the chain, is added to the movable plate to offset the work done by the driver's gravity on the movable plate, reducing the driver's power. The movable plate and counterweight are connected by a chain and then suspended from a pulley (sprocket). The movable plate and counterweight have roughly equal mass, and the upward and downward movement of the counterweight replaces the motor to drive the movable plate's reciprocating motion.

[0143] The above solution is only an illustration of a preferred embodiment, but is not limited thereto. When implementing the present invention, appropriate replacements and / or modifications can be made according to user needs.

[0144] The number of devices and processing scales described herein are intended to simplify the description of the present invention. Applications, modifications, and variations of the present invention will be readily apparent to those skilled in the art.

[0145] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and exemplary embodiments. They can be applied to a variety of fields suitable for the present invention. Further modifications will be readily apparent to those skilled in the art. Therefore, the present invention is not limited to the specific details and illustrations shown and described herein without departing from the general concept defined by the claims and their equivalents.

Claims

1. A method for shielding radiation transmitted by a plate, characterized in that: include: A radiation shielding device with three shielding doors is installed on the input and output sides of the irradiation area; By controlling the opening state of the three shielding doors in the radiation shielding device, when the radiation shielding device is in the working state, at least one door in each radiation shielding device is in the closed state, so as to shield the radiation in the irradiation area; The spacing between the front and rear plates is configured to be greater than the spacing between two adjacent shielding doors, so that there is at least one adjacent shielding door between the front and rear plates, and at least one shielding door is in a fully closed state; In each radiation shielding device, each shielding door is switched between open and closed states by a corresponding power mechanism; Wherein, a sensing mechanism connected to the controller is provided at the position corresponding to each shielding door, and the controller is in communication connection with each power mechanism; In the radiation shielding device, each shielding door is configured to adopt a side-opening shielding door; The side-opening screen door is configured to include: A first fixing plate having a first rectangular hole; A first rotating plate is rotatably disposed on one side of the first fixed plate, wherein the size of the first rotating plate is configured to be larger than the size of the first rectangular hole; Wherein, the first rotating plate is configured to include a first rectangular plate and a first rotating shaft provided on a long side of the first rectangular plate; Both ends of the first rotating shaft are respectively provided with matching first disc plates; The first fixing plate has a shielding plate on one side that matches the mounting surface, the shielding plate is provided with a circular step that matches the first disc plate, and a through hole is provided in the shielding plate for the rotating shaft to extend out; The first fixing plate is provided with a protruding first rectangular step on one side that matches the first rectangular plate, and the first rectangular plate is provided with a second rectangular step on one side that matches the first fixing plate, and the first rectangular step and the second rectangular step are staggered and overlapped in space; A counterweight is provided on the other side of the first rotating shaft opposite to the first rectangular plate.

2. The radiation shielding method for plate transmission according to claim 1, characterized in that: The length of each radiation shielding device is configured to be greater than the length of the plate to be transported.

3. The radiation shielding method for plate transmission according to claim 1, characterized in that: In the radiation shielding device, as an alternative, each shielding door is configured to adopt a rotating shielding door; The revolving screen door is configured to include: Two second fixing plates are arranged opposite to each other, each second fixing plate is provided with a matching second rectangular hole; a second rotating plate rotatably disposed between the two second fixed plates, wherein the size of the second rotating plate is configured to be larger than the size of the second rectangular hole; Wherein, the second rotating plate is configured to include a second rectangular plate and a second rotating shaft arranged at the center position of the second rectangular plate; The two ends of the second rotating shaft are respectively provided with second disc plates that match the second rectangular plate; The diameter of the second disc plate is configured to be larger than the diameter of the disc plate; The distance between the two second fixing plates is configured to be larger than the diameter of the second disc plate.

4. The radiation shielding method for plate transmission according to claim 3, characterized in that: When a rotary shielding door is used in the radiation shielding device, an isolation area is provided outside the shielding door at one end of the radiation shielding device away from the irradiation area.

5. The radiation shielding method for plate transmission according to claim 1, wherein: In the radiation shielding device, as an alternative, each shielding door is configured to adopt a lifting shielding door; The lifting screen door is configured to include: Two third fixing plates are arranged opposite to each other, each of which is provided with a matching third rectangular hole; A movable plate is arranged between the two third fixed plates in a liftable manner, wherein the size of the movable plate is configured to be larger than the size of the third rectangular hole; Wherein, each third rectangular hole is provided with a third rectangular step at a position matching the extended side of the movable plate; The movable plate is provided with a fourth rectangular step which is staggered and overlapped with the third rectangular step.

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