A shielding and protective swing door

Abstract

The present invention discloses a shielding and protective swing door, comprising a supporting device, a door leaf and a door leaf driving device; in the present invention, the support of the door leaf no longer relies on the commonly used hinges, but adopts a load-bearing shaft and a bearing support, which has higher load-bearing performance; and the door shaft and the door body can be separated, which is convenient for installation and maintenance; in addition, the drive of the door leaf no longer relies on the existing door opener on the market, but adopts an electric push rod drive, which has a larger driving torque, can be made into an inward opening type or an outward opening type, and is easy to install; the two important problems of support and drive of this heavy-duty protective door are solved, and a new design idea is provided for the swing-type heavy-duty protective door system of a medical electron linear accelerator, which can benefit enterprises that hope to develop such products and improve my country's radiation shielding door technology.

Description

Technical Field

[0001] The invention belongs to the field of medical protection equipment, and in particular relates to a shielding and protective swing door. Background Art

[0002] With the development of modern medical technology, radiotherapy has become an effective means of cancer treatment. While we enjoy the medical benefits brought by the development of nuclear technology, we cannot ignore the possible harm caused by its radioactivity. The ionization effect of radiation on matter will cause ionization of macromolecules and water molecules in the human body, such as the distortion of DNA molecules. Excessive radiation can damage human cells and organs, and even cause death. Therefore, it is necessary to strictly shield the radiation pollution generated by radiotherapy in accordance with relevant national standards, and radiation-proof doors are a key link.

[0003] my country introduced the first medical linear accelerator as early as 1975. Now, medical linear accelerators have gradually replaced cobalt-60 therapy machines and become the main equipment in my country's tumor radiotherapy. Compared with cobalt-60 therapy machines, medical linear accelerators have a high dose rate and stable beam. In addition to generating X-rays and gamma rays, they can also generate proton beams, neutron beams, and heavy ion beams. For different types of tumors, corresponding particle beams can be selected to achieve better treatment effects. Among them, the rays that can cause harm to the human body mainly include X-rays, gamma rays and neutron rays. In order to adapt to these new characteristics of medical linear accelerators, it is necessary to develop a heavy-duty protective door that can shield neutron rays, X-rays, and gamma rays.

[0004] After entering the 21st century, my country's medical industry has grown rapidly. More and more small and medium-sized hospitals have introduced advanced medical electron linear accelerator equipment. As early as 2013, my country's medical electron linear accelerators reached 1,296 units, and the number increased by 15% every year. At the same time, the demand for heavy-duty radiation-proof doors for medical linear accelerators has also grown rapidly. More and more manufacturers are eager to join the manufacturing industry of medical heavy-duty radiation-proof doors. However, the special use environment has put forward extremely high requirements on the materials, air tightness, load-bearing capacity, and control reliability of such radiation-proof doors. At present, there are not many manufacturers in China that are capable of producing medical heavy-duty radiation-proof doors.

[0005] There are a large number of radiation-proof door manufacturers in China, but they are mainly protective doors for radiological imaging equipment such as CT rooms, DR rooms, X-ray rooms, CR rooms, DSA rooms, and cavity dental rooms. There are very few companies that can produce heavy-duty radiation-proof doors for electron linear accelerator radiotherapy equipment. Medical heavy-duty radiation-proof doors can be divided into four types according to the closing and opening methods: swing doors, sliding doors, revolving doors, and plug doors. Among them, swing doors have the best airtightness, but because the supporting mechanism of swing doors usually uses hinges, the force on the swing doors is equivalent to a cantilever beam. The hinges are prone to wear and deformation after long-term use, and the load-bearing performance requirements of the hinges are extremely high, resulting in shortcomings such as low service life and insufficient load-bearing performance. In addition, due to the heavy weight of the protective door itself, the strongest driving capacity of the existing door opener can only reach 800kg, which is far from meeting the driving requirements of heavy-duty radiation protection doors. Summary of the invention

[0006] In order to overcome the problem of low load-bearing performance of heavy-duty protective doors in the prior art, the present invention provides a shielding protective swing door, which solves the problems of low load-bearing performance, short service life and low safety performance of heavy-duty protective doors in the prior art by adopting a technical solution of a load-bearing shaft and bearing support; the present invention solves the problem of insufficient driving performance of heavy-duty protective doors by improving the driving device.

[0007] The present invention is achieved through the following technical solutions:

[0008] Provided is a shielding and protective swing door, comprising a supporting device, a door leaf and a door leaf driving device;

[0009] In order to facilitate the installation of the door leaf and ensure the sealing performance of the door leaf, the door leaf includes an upper door leaf and a lower door leaf that are detachable and staggered;

[0010] In order to solve the problem of low load-bearing performance in the prior art, the support device includes two support mechanisms with the same structure, the support mechanism includes a hub, a load-bearing shaft, a bearing and a bearing seat, one end of the load-bearing shaft is matched with the hub, and the other end is connected to the bearing, the two hubs are respectively arranged on the sides of the upper door leaf and the lower door leaf, and the two bearing seats are respectively arranged on the wall and the ground, and the technical solution of using the load-bearing shaft with the bearing support to replace the existing hinge hinge greatly improves the load-bearing capacity and ensures the safety of the protective door;

[0011] The driving device includes a controller, a driving mechanism, a slider mechanism and a guide rod mechanism. The controller is connected to the driving mechanism, the driving mechanism is fixedly connected to the slider mechanism, the slider mechanism is connected to the guide rod mechanism through a connecting shaft, and the guide rod mechanism is fixedly connected to the top of the upper door leaf. A simple four-bar mechanism transmission principle is adopted to realize a variety of opening methods of the door leaf, and the driving device can be installed in various positions.

[0012] Furthermore, the door leaf includes a supporting steel frame and an electromagnetic shielding layer, the supporting steel frame includes a first surface, a second surface, and a third surface, the first surface, the second surface and the third surface separate the supporting steel frame into a first cavity and a second cavity, the electromagnetic shielding layer is arranged inside the first cavity and the second cavity, the door leaf is arranged in sequence according to the first surface, the electromagnetic shielding layer, the second surface, the electromagnetic shielding layer and the third surface, the electromagnetic shielding layer includes a lead plate and a boron-containing polyethylene plate, the lead plate is in contact with the first surface and the third surface, and the second surface is in contact with the boron-containing polyethylene plate, a sealing plate is provided on the surface of the door leaf, and the sealing plate is in contact with the supporting steel frame, and the combination of the boron-containing polyethylene plate and the lead plate can achieve the most effective shielding effect on radiation.

[0013] Furthermore, in order to achieve the best shielding effect, the thickness of the lead plate is 15 mm, and the boron content in the boron-containing polyethylene plate is 8%.

[0014] Furthermore, the cross-section of the connection between the upper door leaf and the lower door leaf is a "Z"-shaped inclined groove structure, and the upper door leaf and the lower door leaf are connected by pins. The staggered arrangement of the "Z"-shaped inclined groove structure can prevent radiation leakage from the gap at the connection between the two door leaves.

[0015] Furthermore, the hub and the load-bearing shaft are connected by a key, the load-bearing shaft has two symmetrically arranged flat keys in the circumferential direction, the inner side of the hub is provided with a groove matching with the flat keys, and the load-bearing shaft is axially fixed by a split ring and a round nut.

[0016] Furthermore, the slider mechanism includes a slider and rollers arranged on both sides of the slider, and the slider is provided with a through hole for connecting with a connecting shaft.

[0017] Furthermore, the driving mechanism is an electric push rod, one end of which is fixedly connected to the slider, and the other end is fixedly arranged on the wall through a mounting base, and the middle part is fixed by a support, and the number of the supports is preferably two. This scheme uses an electric push rod as the driving mechanism, which has a larger driving torque and is easy to install.

[0018] Furthermore, the guide rod mechanism includes a guide rod, a rod end joint bearing, a ball head rod end joint bearing and a bearing seat, one end of the rod end joint bearing is connected to the connecting shaft, and the other end is connected to one end of the guide rod, the other end of the guide rod is connected to the ball head rod end joint bearing, and the ball head rod end joint bearing is fixedly arranged on the top of the upper door fan through the bearing seat.

[0019] Furthermore, the driving device also includes a protective cover, which includes a bottom plate, a cover plate and a lower plate. The bottom plate is fixedly arranged on the wall, and the lower plate is provided with a sliding groove for the connecting shaft to pass through.

[0020] Furthermore, a position sensor and an infrared sensor are also arranged inside the door leaf, and the position sensor and the infrared sensor are connected to a controller for controlling the stop closing or automatic opening of the swing door.

[0021] The beneficial effects of the present invention are as follows:

[0022] The support of the door leaf in the present invention no longer relies on the commonly used hinges, but adopts a load-bearing shaft with bearing support, which has higher load-bearing performance; and the door shaft and the door body can be separated, which is convenient for installation and maintenance; in addition, the drive of the door leaf no longer relies on the existing door opener on the market, but adopts an electric push rod drive, which has a larger driving torque, can be made into an inward opening type or an outward opening type, and is easy to install; it solves the two important problems of support and drive of this heavy-duty protective door, and provides a new design idea for the medical electron linear accelerator flat-opening heavy-duty protective door system, which can benefit enterprises that hope to develop such products and improve my country's radiation shielding door technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Main view of the shielded and protected swing door;

[0024] Figure 2 This is the left view of the shielding protection swing door;

[0025] Figure 3 It is a top view of the shielding protection swing door;

[0026] Figure 4 This is a partial enlarged view of the shielding and protective swing door;

[0027] Figure 5 It is an exploded view of the support mechanism for the shielding and protection swing door;

[0028] Figure 6 It is a schematic diagram of the slider mechanism of the shielding and protection swing door;

[0029] Figure 7 Exploded view of the shielding and protection of the swing door leaf and drive device;

[0030] Figure 8 This is a transverse cross-sectional view of the shielding protection casement door leaf;

[0031] Fig. 9 This is a longitudinal section of a shielded and protected swing door leaf. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with specific implementation methods. The accompanying drawings are only used for exemplary descriptions and are only schematic diagrams, not actual drawings, and cannot be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0033] Example 1

[0034] like Figures 1 to 3 As shown, this embodiment provides a shielding and protective swing door, including a support device 1, a door leaf 2 and a door leaf driving device 3, wherein the support device 1 includes two support mechanisms 11 and 12 with the same structure;

[0035] The door leaf 2 comprises an upper door leaf 21 and a lower door leaf 22 which are detachable and staggered;

[0036] The driving device 3 includes a controller, a driving mechanism 31, a slider mechanism 32 and a guide rod mechanism 33. The controller is connected to the driving mechanism 31, the driving mechanism 31 is fixedly connected to the slider mechanism 32, the slider mechanism 32 is connected to the guide rod mechanism 33 through a connecting shaft 34, and the guide rod mechanism 33 is fixedly connected to the top of the upper door fan 21.

[0037] like Figure 1 and 5 As shown, the entire support device is divided into two parts, the upper and lower parts, each of which uses the axis of a shaft as the rotation center, and the coaxiality of the axis of the two shafts is controlled within ø0.2mm; the hub is directly welded to the main load-bearing channel steel on the inner side of the door body; the hub and the shaft are matched with a transition fit, and the circumferential direction is fixed by two double round head flat keys arranged symmetrically at 180°, and the axial direction is positioned by the end face of the shoulder or split ring and fixed with a round nut. Both the upper and lower shafts can withstand axial loads and radial loads, and jointly resist overturning moments, but neither can withstand overturning moments alone.

[0038] Specifically, the supporting mechanisms 11 and 12 have the same structure, both including a hub 101, a load-bearing shaft 102, a bearing 103 and a bearing seat 104. One end of the load-bearing shaft 102 is connected to the hub 101, and the other end is connected to the bearing 103. The two hubs 101 are respectively arranged on the sides of the upper door leaf 21 and the lower door leaf 22, and the two bearing seats 104 are respectively arranged on the wall and the ground; the hub 101 and the load-bearing shaft 102 are connected by keys, and the load-bearing shaft 102 has two symmetrically arranged flat keys 105 in the circumferential direction, and a groove 106 that cooperates with the flat keys is arranged on the inner side of the hub 101, and the load-bearing shaft is axially fixed by a split ring 107 and a round nut 108; in this embodiment, the cooperation between the load-bearing shaft and the bearing is used as the core of the load-bearing structure, and the support of the door leaf no longer relies on the commonly used hinge hinge, but adopts the door shaft to cooperate with the bearing to rely on the support, which has higher load-bearing performance, and the load-bearing shaft and the door leaf can be separated, which is convenient for installation and maintenance;

[0039] like Figure 6 As shown, the slider mechanism 32 includes a slider 321 and rollers 322 arranged on both sides of the slider 321 , and the slider 321 is provided with a through hole 323 for connecting with the connecting shaft 34 .

[0040] like Figure 7 As shown, the driving mechanism 31 includes an electric push rod 311, one end of which is fixedly connected to the slider 321, and the other end is fixedly arranged on the wall through a mounting seat 312. The middle part is fixed by a support 313, and the number of the supports 313 is two.

[0041] The guide rod mechanism 33 includes a guide rod 331, a rod end joint bearing 332, a ball head rod end joint bearing 333 and a bearing seat 334. One end of the rod end joint bearing 332 is connected to the connecting shaft 34, and the other end is connected to one end of the guide rod 331. The other end of the guide rod 331 is connected to the ball head rod end joint bearing 333. The ball head rod end joint bearing 333 is fixedly arranged on the top of the upper door leaf 21 through the bearing seat 334.

[0042] The driving device 3 further includes a protective cover 35 , which includes a bottom plate 351 , a cover plate 352 and a lower plate 353 . The bottom plate 351 is fixedly arranged on the wall, and the lower plate 353 is provided with a slide groove 354 for the connecting shaft 34 to pass through.

[0043] like Figure 8 and 9 As shown, the door leaf 2 mainly includes an electromagnetic shielding layer 24, a supporting steel frame 23 and a sealing plate. Figure 5 As shown, from one side to the other side, it is a sealing plate-support steel frame 23-electromagnetic shielding layer 24-support steel frame 23-sealing plate, and the side is fixed by channel steel; wherein, according to the characteristics of the current electron linear accelerator radiation, the electromagnetic shielding layer 24 includes three layers, the middle is a boron-containing polyethylene plate, and the two sides are lead plates of the same thickness;

[0044] Specifically, the door leaf 2 includes a supporting steel frame 23 and an electromagnetic shielding layer 24, the supporting steel frame includes a first surface 231, a second surface 232, and a third surface 233, the first surface 231, the second surface 232, and the third surface 233 separate the supporting steel frame into a first cavity 234 and a second cavity 235, the electromagnetic shielding layer 24 is arranged inside the first cavity 234 and the second cavity 235, the door leaf is arranged in sequence according to the first surface 231, the electromagnetic shielding layer 24, the second surface 232, the electromagnetic shielding layer 24 and the third surface 233, the electromagnetic shielding layer 24 includes a lead plate 241 and a boron-containing polyethylene plate 242, the lead plate 241 is in contact with the first surface 231 and the third surface 233 respectively, the boron-containing polyethylene plate 242 is in contact with the second surface 232, and a sealing plate is arranged on the surface of the door leaf, which is in contact with the supporting steel frame 23.

[0045] The door itself is heavy, in order to facilitate installation, Figure 2 and 7 As shown in the figure (the right panel of the upper door is hidden to show the supporting steel frame), the door body is divided into two parts, the upper and lower parts; in order to avoid radiation leakage from the gap at the connection between the two parts, the connection surface is a staggered "Z"-shaped inclined groove structure; when installing, first install the lower part of the door body and assist in fixing it, then hoist the upper part, fix the two parts with pins, and then install the sealing plate. Finally, assemble the upper support part of the door body; that is, the cross section of the connection between the upper door leaf 21 and the lower door leaf 22 is a "Z"-shaped inclined groove structure, and the upper door leaf 21 and the lower door leaf 22 are connected by pins 25.

[0046] A position sensor and an infrared sensor are also arranged inside the door leaf, and the position sensor and the infrared sensor are connected to the controller to control the stop closing or automatic opening of the swing door.

[0047] Obviously, the above embodiments are merely examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention.

Claims

1. A shielding and protective swing door, characterized in that: It includes a supporting device, a door leaf and a door leaf driving device; The door leaf comprises an upper door leaf and a lower door leaf which are detachable and staggered; The support device includes two support mechanisms with the same structure, and the support mechanisms include a hub, a load-bearing shaft, a bearing and a bearing seat. One end of the load-bearing shaft is matched and connected with the hub, and the other end is connected with the bearing. The two hubs are respectively arranged on the sides of the upper door leaf and the lower door leaf, and the two bearing seats are respectively arranged on the wall and the ground; The driving device comprises a controller, a driving mechanism, a slider mechanism and a guide rod mechanism, wherein the controller is connected to the driving mechanism, the driving mechanism is fixedly connected to the slider mechanism, the slider mechanism is connected to the guide rod mechanism via a connecting shaft, and the guide rod mechanism is fixedly connected to the top of the upper door fan; The slider mechanism includes a slider and rollers arranged on both sides of the slider, the slider is provided with a through hole for connecting to a connecting shaft, the driving mechanism includes an electric push rod, one end of the electric push rod is fixedly connected to the slider, the other end is fixedly arranged on the wall through a mounting seat, and the middle part is fixed by a support, the guide rod mechanism includes a guide rod, a rod end joint bearing, a ball head rod end joint bearing and a bearing seat, one end of the rod end joint bearing is connected to the connecting shaft, and the other end is connected to one end of the guide rod, the other end of the guide rod is connected to the ball head rod end joint bearing, and the ball head rod end joint bearing is fixedly arranged on the top of the upper door fan through the bearing seat.

2. The shielding and protective swing door according to claim 1, characterized in that: The door leaf includes a supporting steel frame and an electromagnetic shielding layer, the supporting steel frame includes a first surface, a second surface, and a third surface, the first surface, the second surface, and the third surface separate the supporting steel frame into a first cavity and a second cavity, the electromagnetic shielding layer is arranged inside the first cavity and the second cavity, the door leaf is arranged in sequence according to the first surface, the electromagnetic shielding layer, the second surface, the electromagnetic shielding layer, and the third surface, the electromagnetic shielding layer includes a lead plate and a boron-containing polyethylene plate, the lead plate is in contact with the first surface and the third surface, the second surface is in contact with the boron-containing polyethylene plate, the surface of the door leaf is provided with a sealing plate, and the sealing plate is in contact with the supporting steel frame.

3. The shielding and protective swing door according to claim 2, characterized in that: The thickness of the lead plate is 15 mm, and the boron content in the boron-containing polyethylene plate is 8%.

4. The shielding and protective swing door according to claim 1, characterized in that: The cross section of the connection between the upper door leaf and the lower door leaf is a "Z"-shaped inclined groove structure, and the upper door leaf and the lower door leaf are connected by pins.

5. The shielding and protective swing door according to claim 1, characterized in that: The hub and the load-bearing shaft are connected by a key. The load-bearing shaft has two symmetrically arranged flat keys in the circumference. The inner side of the hub is provided with a groove that matches the flat keys. The load-bearing shaft is axially fixed by a split ring and a round nut.

6. The shielding and protective swing door according to claim 1, characterized in that: The driving device also includes a protective cover, which includes a bottom plate, a cover plate and a lower plate. The bottom plate is fixedly arranged on the wall, and the lower plate is provided with a sliding groove for the connecting shaft to pass through.

7. The shielding and protective swing door according to claim 1, characterized in that: A position sensor and an infrared sensor are also provided inside the door leaf, and the position sensor and the infrared sensor are connected to a controller for controlling the stop, closing or automatic opening of the swing door.

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