Beam line station shielding door structure based on safety interlocking and radiation protection method

Abstract

The invention provides a beam line station shielding door structure based on safety interlocking and a radiation protection method, and belongs to the technical field of radiation protection. The structure comprises a horizontal sliding door assembly, a ground radiation protection sealing strip assembly, a driving assembly and a safety interlocking assembly. The horizontal sliding door assembly adopts a normally-closed door and a normally-opened door which are separately arranged left and right; a door plate and a door frame form an S-shaped labyrinth anti-radiation structure through an L-shaped lead sealing strip; the ground protection sealing strip is of a steel-lead sandwich structure, is arranged in a ground groove in the inner side of a door opening and is driven by a linear motor to ascend and descend through a traction rod. The safety interlocking assembly comprises a door lock interlocking signal and a limit switch signal which are connected in series, and light transmission safety is ensured. According to the protection method, radiation shielding and equipment transportation are taken into consideration by switching the light passing mode and the maintenance mode. The sliding door overcomes the defects that an existing sliding door is large in slotting and low in space utilization rate, and has the advantages of being reliable in radiation protection, high in space utilization rate, convenient and fast in equipment transportation and perfect in safety interlocking.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of radiation protection structure, and particularly relates to a radiation protection structure for a shielding door of a beamline station of an accelerator type light source device and an adapted safety interlock method. BACKGROUND

[0002] The interaction of electron bunches of an accelerator type light source and gas molecules in a vacuum pipe can generate primary bremsstrahlung radiation, and the electron bunches can generate synchrotron radiation when deflected and speed changes. The bremsstrahlung radiation and the synchrotron radiation transmitted to the beamline station can interact with optical elements or gas molecules in the vacuum pipe to cause beam loss, and secondary bremsstrahlung radiation can be generated around the interaction point. Therefore, the main optical elements of the beamline station are installed in a radiation protection shed. The radiation protection shed is used to shield various types of radiation in the shed, and to ensure the safety of personnel outside the shed during light transmission. At the same time, it is also necessary to facilitate the entry and exit of the equipment of the beamline station into the shed during operation and maintenance. Therefore, the shielding structure design of the radiation protection shed is related to the safety of the experimental personnel.

[0003] The protection door is the only passage for equipment and personnel to enter and exit the radiation protection shed, and therefore the radiation protection structure and safety interlock method of the protection door of the shed become the most important part of the design of the radiation protection shed. The design requires that the shielding structure does not leak radiation during light transmission, and facilitates the entry and exit of personnel and equipment into the shed during operation and maintenance.

[0004] The existing accelerator devices in China, such as the Beijing HEPS synchrotron radiation light source, the Shanghai SSRF synchrotron radiation light source, and the Shanghai hard X-ray free electron laser device (SHINE), all use a ground slot + pneumatic double translation door structure. This structure can meet the space requirements and radiation protection requirements when the overall size of the shed is large.

[0005] The currently under-construction Hefei Advanced Light Source device is the first synchrotron radiation device in China with a spectral range mainly in extreme ultraviolet rays and soft X-rays. In order to meet the light adjustment requirements of the experimental station, most of the optical elements and experimental equipment need to be installed outside the radiation protection shed, and therefore the overall size of the radiation protection shed is limited.

[0006] The shielding method of the existing radiation protection door has the following characteristics:

[0007] 1. The protection door is usually a pneumatic translation structure, which requires a slot width of more than 4m long for a 2m wide door hole, greatly occupying the space of safety interlock cabinets, switches, and sockets and other equipment on the outer wall of the shed. And the slot position is on the outside of the shed, affecting the ground integrity and overall aesthetics;

[0008] 2. The side wall of the general radiation protection shed needs to be provided with a radiation protection labyrinth structure for feeding various pipelines and bridge structures, and the installation of the sliding door and its guide rail will affect the number of the labyrinth on the shed.

[0009] 3. The beam line station equipment is heavy and precise in structure, and usually needs to be transported into (or out of) the shed by a hydraulic vehicle or an air floating carrying plate. Due to the ground slot, the equipment needs to be manually installed with a cushion block to fill the sliding door slot to transport the equipment, which is extremely inconvenient. SUMMARY

[0010] The purpose of the present application is to provide a radiation shielding structure of a beam line station protection door and a corresponding safety interlocking design and use method, so as to realize a stable radiation protection shielding method which can meet the requirements of radiation protection and safety interlocking and is convenient for transporting the beam line station equipment.

[0011] In order to achieve the above purpose, the present application provides the following technical scheme:

[0012] A safety interlocking based beam line station shielding door structure, comprising a radiation protection shed, a sliding door assembly provided at a door opening of the radiation protection shed, a ground radiation protection sealing strip assembly, a driving assembly and a safety interlocking assembly.

[0013] The sliding door assembly comprises left and right symmetrically arranged door plate structures, and the door plate structures comprise a left door and a right door, the left door is a normally closed door, the right door is a normally open door, a first manual door lock is arranged between the left door and a door frame, a second manual door lock is arranged between the left door and the right door, the first manual door lock and the second manual door lock can both output interlocking signals, and the signals of the two are connected in series.

[0014] A three-side L-shaped lead sealing strip is arranged between the door plate structure of the sliding door assembly and the door frame, and a door frame protection sealing strip is correspondingly arranged on the door frame, the L-shaped lead sealing strip and the door frame protection sealing strip are overlapped to form an S-shaped labyrinth radiation protection structure.

[0015] The ground radiation protection sealing strip assembly is arranged in a ground slot on the inner side of the door opening of the radiation protection shed, and comprises a ground protection sealing strip of a steel-lead sandwich structure, the inner layer of the ground protection sealing strip is a lead plate, and the outer layer is a steel plate, positioning steel plates are arranged on both sides of the ground protection sealing strip, and lifting holes are arranged on both sides of the top surface.

[0016] The driving assembly comprises linear motors symmetrically installed on both sides of the door frame inside the door, and the linear motors are connected with the ground protection sealing strip through a traction rod and used to drive the ground protection sealing strip to rise and fall.

[0017] The safety interlocking assembly comprises limit switches symmetrically installed on the steel structures on both sides of the door, which are matched with the positioning steel plates and used for detecting the lifting state of the ground protection seal and outputting a position signal, and the signals of the two limit switches are transmitted to the safety interlocking controller in series.

[0018] As a further technical scheme of the present application, the L-shaped lead seal is arranged on the two side surfaces and the top surface of the door plate structure, and the door frame protection seal is arranged on the two sides and the top of the door frame.

[0019] As a further technical scheme of the present application, the width of the ground slot is greater than the door width, and the ground protection seal is lifted without radiation leakage from the door side gap.

[0020] As a further technical scheme of the present application, the thickness of the lead plate is set according to the lead equivalent requirement of the radiation protection shed.

[0021] As a further technical scheme of the present application, the linear motor is a fixed stroke motor or a servo motor, and the servo motor is linked with the limit switch signal to control the lifting stroke.

[0022] As a further technical scheme of the present application, when the ground protection seal is completely lifted, a lap joint amount of a preset thickness is maintained between the ground protection seal and the ground.

[0023] As a further technical scheme of the present application, the flat sliding door assembly further comprises a door closer installed at the connection position of the right door and the door frame.

[0024] As a further technical scheme of the present application, the safety interlocking assembly further comprises a control and display assembly electrically connected with the safety interlocking controller, which is used for displaying the shielding door state and controlling the start and stop of the linear motor.

[0025] A radiation protection method based on the above shielding door structure, comprising the following steps:

[0026] S1: when the light transmission mode is started, the safety interlocking controller sends an instruction, and the linear motor drives the ground protection seal upward through the traction rod;

[0027] S2: when the ground protection seal is completely lifted, the two side positioning steel plates trigger the corresponding limit switches, the limit switches output a 1 signal and transmit it to the safety interlocking controller in series;

[0028] S3: after the safety interlocking controller detects the interlocking signals of the first manual door lock and the second manual door lock and the series signals of the limit switches, it is determined that the light transmission condition is met, and the light beam line station starts the light transmission operation.

[0029] S4: When the device maintenance mode is started, the safety interlock controller controls the linear motor to run reversely, and the ground protection seal is lowered to the top surface and is flush with the ground.

[0030] S5: The first manual door lock and / or the second manual door lock are unlocked, the left door and / or the right door are opened, the device is accessed or maintained, the door lock interlocking signal is disconnected, and the light beam line station stops transmitting light.

[0031] The present technology proposes a light beam line station shielding door structure based on safety interlocking and a radiation protection method, which has the following advantages and beneficial effects:

[0032] (1) The present application is used for a push door structure, the ground slot position is on the inside of the protection door, which does not affect the overall appearance; and the slot width is slightly larger than the door hole size, which is much smaller than the slot size of the sliding door structure, thereby ensuring the integrity of the ground as much as possible.

[0033] (2) The push door structure can be manual or electric, the speed and stroke are easy to control, and impact and noise are not caused;

[0034] (3) The lifting of the ground protection seal is controlled by a fixed-stroke motor, or a servo motor can be used to accept a limit switch signal to control the stroke, which is convenient for switching between the device maintenance mode and the light transmission operation mode;

[0035] (4) The linear motor and the limit switch are small and light in structure, and are installed close to the ground, which is convenient for maintenance and replacement. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a schematic view of the ground protection seal structure.

[0037] Figure 2 It is a schematic view of the linear motor.

[0038] Figure 3 It is a schematic view of the limit switch.

[0039] Figure 4 It is a schematic view of the control and display assembly.

[0040] Figure 5 It is a schematic view of the traction rod.

[0041] Figure 6 It is a schematic view of the shielding door structure.

[0042] Figure 7 It is a schematic view of the door panel.

[0043] Figure 8 It is a schematic view of the protection door in the open state from the perspective of the shed.

[0044] Figure 9 It is a cross-sectional view in the open state.

[0045] Figure 10 This is a schematic diagram showing the protective door closed from the perspective of someone inside the shed.

[0046] Figure 11 This is a cross-sectional view of the device in the off state.

[0047] In the diagram: 1. Outer steel plate; 2. Inner lead plate; 3. Pull ring; 4. Limit trigger structure; 6. Main body shell; 7. Telescopic rod; 8. Pull ring; 9. Stator; 10. Rotor; 11. Main body shell; 12. Wiring hole; 13. Positioning hole; 14. Mounting back plate; 15. Limit push rod; 16. Controller body; 17. Status indicator light; 18. Control button; 19. Connecting plate; 20. Door panel structure; 21. Outer door handle; 22. Inner door handle; 23. Door closer; 24. Normally open door lock; 25. Normally closed door lock; 26. Ground latch; 27. Hinge; 28. Radiation protection shed side wall panel; 29. ​​Channel steel support structure; 30. Door frame protective seal; 31. Linear motor; 32. Limit switch; 33. Control and display components; 34. Ground protective seal; 35. Traction rod; 36. Ground; 37. Protective door. Detailed Implementation

[0048] The present invention will be further described below with reference to the embodiments. It should be noted that these are merely examples and descriptions of the inventive concept. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the inventive concept or exceed the scope defined in the claims, they should all be considered to fall within the protection scope of the present invention.

[0049] like Figures 1-11 As shown, a beamline station shielding door structure based on safety interlocking includes a radiation protection shed, a sliding door assembly, a ground radiation protection sealing strip assembly, a drive assembly, and a safety interlocking assembly.

[0050] The sliding door assembly is installed at the doorway of the radiation protection shed, including a left door (normally closed) and a right door (normally open). A first manual door lock 25 is installed between the left door and the door frame, and a second manual door lock 24 is installed between the left door and the right door. Both door locks are mechanical door locks with interlocking signal output, and the signals are connected in series to the safety interlock controller. "L"-shaped lead seals are fixedly installed on both sides and the top surface of the door panel 20, and door frame protective seals 30 are installed at the corresponding positions on the door frame. The two overlap to form an "S"-shaped maze radiation protection structure. The lead equivalent of the lead seals is consistent with the overall protection requirements of the shed. A door closer 23 is installed between the right door and the door frame to realize the automatic door closing function.

[0051] The ground radiation protection seal assembly is arranged in the ground slot on the inner side of the door hole. The ground protection seal 34 adopts a steel lead sandwich structure. The inner layer lead plate 2 has a thickness of 10 mm (which is adjusted according to actual lead equivalent requirements). The outer layer steel plate 1 has a thickness of 3 mm. The two sides are welded with 10 mm thick positioning steel plates 4. The top surface is welded with M16 lifting holes 3. The ground slot has a width of 200 mm wider than the door hole and a depth of 50 mm greater than the height of the ground protection seal, so as to ensure smooth lifting of the seal.

[0052] The driving assembly includes two linear motors 31 of LM12 type, which are symmetrically arranged on the channel steel support structures 29 on the two sides of the door frame. The telescopic rods 7 of the linear motors are connected with the lifting holes 3 of the ground protection seal 34 through traction rods 35. The traction rods are made of stainless steel and are hinged with the telescopic rods and the lifting holes through pins at both ends.

[0053] The safety interlocking assembly includes two limit switches 32 of ME-8108 type, which are symmetrically arranged on the steel structures on the two sides of the door and correspond to the positions of the positioning steel plates 4. The signal output ends of the limit switches are connected in series and connected to the safety interlocking controller. The control and display assembly 33 is arranged on the inner side wall of the door and includes a controller main body 16, state display lamps 17 (which respectively display the door body state, the seal state and the interlocking state) and control buttons 18 (including a light transmission mode button, a maintenance mode button and an emergency stop button).

[0054] The radiation protection method of the embodiment is specifically as follows:

[0055] When the light transmission operation is performed, the operator presses the light transmission mode button of the control and display assembly 33. The safety interlocking controller controls the linear motor 31 to start. The telescopic rod 7 is extended and pulls the ground protection seal 34 upward through the traction rod 35. When the seal is lifted to a lap joint amount of 8 mm, the positioning steel plates 4 on the two sides push the limit rods 15 of the limit switches 32. The limit switches output a “1” signal. After the safety interlocking controller detects the closing signals (“1” signals) of the first manual door lock 25 and the second manual door lock 24 and the series signals of the limit switches, the state display lamps 17 all turn green. The light transmission signal is sent to the light beam line station control system. The light beam line station starts the light transmission operation.

[0056] When the equipment is maintained, the light beam line station stops passing light, the operator presses the maintenance mode button, the safety interlock controller controls the linear motor 31 to run reversely, the telescopic rod 7 is retracted, the ground protection seal 34 is lowered to be flush with the ground 36; the operator unlocks the first manual door lock 25 (large equipment access) and / or the second manual door lock 24 (personnel access) with a key, opens the protection door 37, at this time the door lock interlocking signal becomes "0", the status display lamp 17 becomes yellow, the safety interlock controller prohibits the light passing signal output; after the maintenance is completed, the protection door is closed and the door lock is locked, the door lock signal returns to "1", and the light passing mode button is pressed to restore the light passing.

[0057] The present application combines the flat sliding door structure and the liftable ground protection seal, cooperates with multiple safety interlocking logics, ensures the radiation protection effect, greatly improves the space utilization and equipment transportation convenience, and is suitable for the light beam line station with limited shed size such as the Hefei advanced light source.

[0058] The above is an exemplary description of the application, and obviously, the specific implementation of the application is not limited by the above method. As long as the method concept and technical solution of the application are adopted for non-essential improvement or the concept and technical solution of the application are directly applied to other occasions without improvement, they are within the protection scope of the application.

Claims

1. A beamline station shielding door structure based on safety interlocks, characterized by, The application relates to a radiation protection shed (28), a sliding door assembly arranged at a door opening of the radiation protection shed (28), a ground radiation protection seal assembly, a driving assembly and a safety interlocking assembly. The sliding door assembly comprises left and right symmetrical door plate structures (20), the left door plate structure is a left door, the right door plate structure is a right door, a first manual door lock (25) is arranged between the left door and a door frame, a second manual door lock (24) is arranged between the left door and the right door, the first manual door lock (25) and the second manual door lock (24) can output interlocking signals, and the signals of the two are connected in series. The door plate structure (20) of the sliding door assembly is provided with three-side L-shaped lead seals between the door plate structure (20) and the door frame, and the door frame is correspondingly provided with a door frame protection seal (30), the L-shaped lead seals and the door frame protection seal (30) are overlapped to form an S-shaped labyrinth radiation protection structure. The ground radiation protection seal assembly is arranged in a ground groove on the inner side of the door opening of the radiation protection shed (28), comprises a ground protection seal (34) with a steel-lead sandwich structure, the inner layer of the ground protection seal (34) is a lead plate (2), the outer layer is a steel plate (1), both sides of the ground protection seal (34) are provided with positioning steel plates (4), and both sides of the top surface are provided with lifting holes (3). The driving assembly comprises linear motors (31) symmetrically arranged on both sides of the door frame in the door, the linear motors (31) are connected with the ground protection seal (34) through traction rods (35) and are used for driving the ground protection seal (34) to lift. The safety interlocking assembly comprises limit switches (32) symmetrically arranged on both sides of the steel structure in the door, the limit switches (32) are matched with the positioning steel plates (4) and are used for detecting the lifting state of the ground protection seal (34) and outputting position signals, and the signals of the two limit switches (32) are connected in series and then transmitted to a safety interlocking controller.

2. The safety interlock based beamline station shielding door structure of claim 1, wherein, The L-shaped lead seals are arranged on the two side surfaces and the top surface of the door plate structure (20), and the door frame protection seals (30) are correspondingly arranged on the two sides and the top of the door frame.

3. The safety interlock based beamline station shielding door structure of claim 1, wherein, The width of the ground groove is greater than the width of the door opening, and the ground protection seal (34) can be lifted without radiation leaking from the door side gap.

4. The safety interlock based beamline station shielding door structure of claim 1, wherein, The thickness of the lead plate (2) is determined according to the lead equivalent requirement of the radiation protection shed (28).

5. The safety interlock based beamline station shielding door structure of claim 1, wherein, The linear motor (31) is a fixed stroke motor or a servo motor, the servo motor is connected with the limit switch (32) in signal linkage to control the lifting stroke.

6. The safety interlock based beamline station shielding door structure of claim 1, wherein, When the ground protection seal (34) is completely lifted, a preset overlapping amount is kept between the ground protection seal (34) and the ground (36).

7. The safety interlock based beamline station shielding door structure of claim 1, wherein, The sliding door assembly further comprises a door closer (23) arranged at the connecting position of the right door and the door frame.

8. The safety interlock based beamline station shielding door structure of claim 1, wherein, The safety interlocking assembly further comprises a control and display assembly (33) electrically connected with the safety interlocking controller and used for displaying the state of the shielding door (37) and controlling the start and stop of the linear motor (31).

9. A method of radiation protection based on the shielding door structure according to any one of claims 1 to 8, characterized in that, The application further relates to a radiation protection method comprising the following steps: The application relates to a radiation protection shed (28), a sliding door assembly arranged at a door opening of the radiation protection shed (28), a ground radiation protection seal assembly, a driving assembly and a safety interlocking assembly. S1: When the light transmission mode is started, the safety interlock controller sends a command, and the linear motor (31) drives the ground protection seal (34) to lift up through the traction rod (35); S2: When the ground protection seal (34) is completely lifted, the two side positioning steel plates (4) trigger the corresponding limit switches (32), and the limit switches (32) output a signal and transmit it in series to the safety interlock controller; S3: After the safety interlock controller detects the interlocking signals of the first manual door lock (25) and the second manual door lock (24) and the series signals of the limit switches (32), it is determined that the light transmission condition is met, and the light beam line station starts the light transmission operation; S4: When the equipment maintenance mode is started, the safety interlock controller controls the linear motor (31) to operate in reverse, and the ground protection seal (34) is lowered to the top surface flush with the ground (36); S5: Unlock the first manual door lock (25) or the second manual door lock (24), open the left door or the right door, and perform equipment access or maintenance operation. The door lock interlocking signal is disconnected, and the light beam line station stops light transmission.

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