Gamma irradiation device offline space and ray irradiation mechanism and usage method

Abstract

The present invention relates to an irradiation mechanism that utilizes the offline space and rays of a gamma irradiation device, including a closed suspension chain conveying path and an automatic rotary surface-changing mechanism that cooperates with the suspension chain conveying path. A detachable irradiation container is suspended below the automatic rotary surface-changing mechanism; the automatic rotary surface-changing mechanism includes a positioning pin vehicle and a suspension main shaft. One end of the suspension main shaft is arranged on the suspension chain conveying path, and the other end is connected to the irradiation container. A rotating mechanism is provided on the suspension main shaft to drive the irradiation container to perform rotary surface-changing. During use, since the suspension chain conveying path is arranged in the offline space of the irradiation chamber, the automatic rotary surface-changing mechanism drives the irradiation container to complete automatic rotary surface-changing at a predetermined position, improving the utilization of the offline space and greatly enhancing the utilization rate of the cobalt source ray energy of the irradiation device in the irradiation chamber.

Description

Technical Field

[0001] The present invention relates to the technical field of irradiation equipment, and particularly to an irradiation mechanism using the space and rays under the gamma irradiation device and its usage method. Background Art

[0002] In the field of nuclear technology utilization, industrial gamma irradiation devices use cobalt-60 nuclide radiation sources for irradiation processing. It is the research and utilization of clean energy and conforms to the national policy orientation of "carbon peak" and "carbon neutrality". While operating within the framework of a series of regulations on radiation safety and protection and environmental health work, irradiation processing units are constantly seeking effective ways to improve the utilization rate of cobalt source rays.

[0003] Cobalt-60 nuclide decays naturally and emits gamma rays all the time. Its half-life T1 / 2 is 5.27 years, that is, the activity of the cobalt source (unit: curie Ci) decreases by 12.4% in each annual calculation cycle. This natural decay of the cobalt source activity is a cost consumption with a significant proportion and is an irreducible fixed cost expenditure. Therefore, maximizing the utilization of the energy of cobalt source rays to irradiate and process more products that meet the dose requirements, improving the utilization rate of the cobalt source, and achieving the optimization of input-output are one of the important goals pursued by the production technology management of industrial gamma irradiation devices. The utilization rate of the cobalt source is related to many factors, such as the structural elements of the irradiation device, the physical properties of the irradiated products, the irradiation processing technology, the irradiation processing time, the position in the irradiation space, etc. Currently, the utilization rate of the energy of cobalt source rays in irradiation devices varies from 15% to 35%. Therefore, industrial gamma irradiation devices should continuously research and adopt technical means to improve the utilization rate of ray energy on the premise of safety.

[0004] In the space of the irradiation chamber, the intensity of gamma rays decreases regularly from the source plate as the center origin to the surroundings. The ray intensity at a certain point in the space is proportional to the activity of the cobalt source, inversely proportional to the square of the distance from the center of the cobalt source, and inversely proportional to the density and thickness of the irradiated products passing through. Generally speaking, the greater the activity of the cobalt source, the greater the ray intensity in its irradiation space, and the closer to the center line of the cobalt source, the greater the ray intensity. Therefore, on the premise of safety, the irradiation processing line of the irradiation device is optimally designed and installed as close as possible to the center line of the cobalt source in order to obtain greater ray intensity and better cobalt source utilization rate in the space above the irradiation line. In addition, we found that there is still a certain amount of ray energy distributed in the safe space under the irradiation line, and there is a feasibility of reasonable and safe utilization.

[0005] Therefore, how to reasonably utilize the space around the processing loop in the irradiation chamber (or called the space under the line) is a difficult problem that cannot be (has not been) solved in the prior art, and a series of supporting settings and operation methods are urgently needed to improve the utilization rate of the energy of cobalt source rays in the irradiation device. Summary of the Invention

[0006] The object of the present invention is to provide an irradiation mechanism using the offline space and rays of a gamma irradiation device and its usage method. By setting a closed suspension chain conveying path and an automatic rotation and surface conversion mechanism that can travel along the suspension chain conveying path in the irradiation offline space, the utilization rate of the cobalt source ray energy of the irradiation device is greatly improved, which is beneficial to the implementation of the irradiation process.

[0007] In order to achieve the above object, the technical solution of the present invention is: an irradiation mechanism using the offline space and rays of a gamma irradiation device, characterized in that: the irradiation device includes a closed suspension chain conveying path and an automatic rotation and surface conversion mechanism cooperating with the suspension chain conveying path, and a detachable irradiation container is suspended below the automatic rotation and surface conversion mechanism; the automatic rotation and surface conversion mechanism includes a positioning pin vehicle and a suspension main shaft, one end of the suspension main shaft is arranged on the suspension chain conveying path, the other end is connected to the irradiation container, and a rotation mechanism is arranged on the suspension main shaft to drive the irradiation container to perform rotation and surface conversion.

[0008] Preferably, the track of the suspension chain conveying path is arranged along the top of the product entrance and exit, maze and inspection passage of the irradiation chamber and forms a closed loop; the suspension chain conveying path includes a suspension chain, a suspension bracket is arranged below the suspension chain, the suspension main shaft is rotatably connected with the suspension bracket through a bearing, and the suspension chain conveying path further includes a set of roller track columns cooperating with the automatic rotation and surface conversion mechanism.

[0009] Furthermore, the roller track columns cooperate with the rotation mechanism. Lifting wheels are symmetrically arranged on the left and right sides below the positioning pin vehicle, a fixed seat is arranged below the lifting wheels, and a ramp track for the lifting of the lifting wheels is arranged on the suspension chain conveying path.

[0010] A usage method of an irradiation mechanism using the offline space and rays of a gamma irradiation device, characterized in that: the usage method includes the following steps: a. Install a suspension chain conveying path in the top space of the product entrance and exit, maze and irradiation chamber inspection passage of the irradiation chamber, and the suspension chain conveying path is cooperated with an automatic rotation and surface conversion mechanism; b. There are several irradiation containers in the irradiation chamber, and these irradiation containers are uniformly arranged at the irradiation positions on both sides of the source plate in the irradiation chamber; c. The automatic rotation and surface conversion mechanism is arranged on a straight line segment of the suspension chain conveying path. When the irradiation container enters this straight line segment and needs to rotate, the automatic rotation and surface conversion mechanism opens the positioning pin, and the automatic rotation and surface conversion mechanism rotates 180 degrees driven by a rotation gear, thereby driving the irradiation container to complete the rotation, and then the positioning pin is closed, and the irradiation container is separated from the automatic rotation and surface conversion mechanism.

[0011] Compared with the prior art, the technical solution of the present invention includes not only the improvement of the overall technical solution, but also many improvements in details. Specifically, it has the following beneficial effects:

[0012] 1. In the improvement solution of the present invention, the irradiation mechanism includes a closed suspension chain conveying path and an automatic rotary surface-changing mechanism cooperating with the suspension chain conveying path. Since the suspension chain conveying path is arranged in the offline space inside the irradiation chamber, that is, the top space of the product inlet / outlet of the irradiation chamber, the maze, and the inspection passage of the irradiation chamber, the automatic rotary surface-changing mechanism drives the irradiation container to rotate and change the surface, improving the utilization of the offline space and greatly enhancing the utilization rate of the cobalt source ray energy of the irradiation device inside the irradiation chamber;

[0013] 2. In the technical solution of the present invention, the suspension chain conveying path forms a circulating closed loop in the offline safe space to realize the automatic control of the irradiation product conveying;

[0014] 3. The automatic rotary surface-changing mechanism of the present invention includes a positioning pin vehicle and a suspension main shaft. One end of the suspension main shaft is arranged on the track of the suspension chain conveying path, and the other end is connected to the irradiation container. A rotating mechanism is provided on the suspension main shaft to enable the irradiation container to automatically rotate and change the surface. The entire surface-changing process is efficient, safe, flexible, and convenient;

[0015] 4. The irradiation mechanism using the offline space and rays of the gamma irradiation device of the present invention can be applied to most irradiation chambers, is convenient to use, has good effects, and is convenient for popularization and utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention.

[0017] Figure 2 is a schematic structural diagram of the offline space inside the irradiation chamber in the specific implementation of the present invention.

[0018] Figure 3 is Figure 2 a plan view of the dose field mathematical model of the A-A section in

[0019] Figure 4 is Figure 2 a plan view of the dose field mathematical model of the B-B section in

[0020] Figure 5 is a schematic diagram of the suspension chain conveying path in the specific implementation of the present invention.

[0021] Figure 6 is a schematic structural diagram of the suspension main shaft in the specific implementation of the present invention.

[0022] Figure 7 is a schematic structural diagram of the rotating gear in the specific implementation of the present invention.

[0023] Figure 8 is a schematic structural diagram of the roller row rail in the specific implementation of the present invention.

[0024] Figure 9 This is a schematic structural diagram of the positioning pin vehicle in the specific implementation of the present invention.

[0025] Figure 10 This is a schematic structural diagram of the ramp track in the specific implementation of the present invention.

[0026] Reference numerals:

[0027] 1 Suspension chain conveying path, 2 Suspension main shaft, 3 Positioning pin vehicle, 4 Irradiation container, 5 Rotating gear, 6 Roller row track, 7 Ramp track;

[0028] 11 Irradiation chamber, 12 Source storage well, 13 Source plate, 14 On-line space irradiation area, 15 Off-line space irradiation area;

[0029] 21 Suspension chain, 22 Hanger, 23 Bearing;

[0030] 31 Positioning pin, 32 Lifting wheel, 33 Fixed seat;

[0031] 51 Positioning pin hole;

[0032] 61 Toothless neutral gear, 62 Guide rail; Detailed implementation manners

[0033] Next, the technical solution of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] The present invention provides an irradiation mechanism that utilizes the off-line space and rays of a gamma irradiation device. Specifically, refer to Figure 1 , and its difference from the prior art lies in that: the irradiation device includes a closed suspension chain conveying path 1 and an automatic rotation and surface conversion mechanism that cooperates with the suspension chain conveying path. A detachable irradiation container 4 is suspended under the automatic rotation and surface conversion mechanism, and these irradiation containers can also be stacked; the automatic rotation and surface conversion mechanism includes a positioning pin vehicle 3 and a suspension main shaft 2. One end of the suspension main shaft is arranged on the suspension chain conveying path, and the other end is connected to the irradiation container. A rotation mechanism is provided on the suspension main shaft, which can drive the positioning pin vehicle to rotate, so as to enable the irradiation container to rotate and convert the surface.

[0035] The irradiation mechanism of the present invention is arranged in the off-line space. Specifically, if the processing loop of an irradiation device is called the on-line space, then the space around the processing loop in the irradiation chamber can be called the off-line space ( Figure 2), i.e., the remaining space on both sides and at the ends of the source plate. Generally, the horizontal median line area of the vertical plane of the source plate is the best utilization area, where the ray energy intensity is relatively high and the distribution is relatively uniform, which is conducive to the implementation of the irradiation process. The offline space conditions of the existing irradiation devices vary.

[0036] To make full use of the offline space and rays, it is necessary to obtain the ray intensity data of the offline space so that the irradiation dose of the products can be controlled within a precise range to meet the relevant standards for irradiation sterilization and modification. In production practice, the dose rate is usually used to represent the ray intensity at a certain coordinate point or area in the space. Different doses received per unit time not only indicate different dose rates at different coordinate points but also represent the magnitude of the ray intensity.

[0037] First, establish a mathematical model of the dose field. Taking the space axis (center line of the source plate) of the irradiation chamber as the baseline, establish a three-dimensional coordinate system. For each applicable actual point corresponding to the coordinate point, arrange dosimeters, set the irradiation time, conduct irradiation, perform dose calibration measurements, and statistically analyze the data. Use the measurement data results to establish a planar dose field model with isodose lines to realize the understanding and description of the dose distribution or ray intensity law in the irradiation chamber space. The following are two representative planar dose field models in the dose field test experiment results of a certain gamma irradiation device irradiation chamber.

[0038] From ( Figure 3 ), it can be intuitively seen the distribution of the ray intensity and the isodose area distribution in the cross-section parallel to the center line of the source plate. Among them, the maximum dose rate is 146.5 kGy / h, and the minimum dose rate is 1.2 kGy / h. ( Figure 4 ) shows the ray intensity distribution in the cross-section perpendicular to the center line of the source plate. The maximum dose rate is 122 kGy / h, and the minimum dose rate is 2.7 kGy / h. From this, the ray distribution law can be discovered and used to guide practice.

[0039] By establishing the mathematical model of the dose field, it provides technical support for subsequent work such as the selection of the irradiation path, the determination of the irradiation time, the suitable irradiated products, and the control of the irradiation process in the irradiation process design.

[0040] Through the analysis of the dose field data, determine the available irradiation space, offline irradiation loop, irradiation container, and the applicable irradiation dose range, and carry out the design of the utilization plan and the design, installation, and verification of the irradiation transmission system and the automatic control system. Thus, a device for utilizing the offline space and rays is formed and can be put into use, and the irradiation and dose control of the products are realized through the automatic control operation of the offline irradiation device.

[0041] Example 1

[0042] The irradiation mechanism includes a closed suspension chain conveying path 1 and an automatic rotary surface-changing mechanism cooperating with the suspension chain conveying path. A detachable irradiation container 4 is suspended below the automatic rotary surface-changing mechanism. The automatic rotary surface-changing mechanism includes a positioning pin vehicle 3 and a suspension main shaft 2. One end of the suspension main shaft is arranged on the suspension chain conveying path, and the other end is connected to the irradiation container. A rotating mechanism is provided on the suspension main shaft to enable the irradiation container to rotate and change its surface.

[0043] The suspension chain conveying path is arranged along the top of the product entrance and exit, maze, and inspection passage of the irradiation chamber and forms an independent closed loop arranged in the offline space. The product entrance and exit, maze, and inspection passage of the irradiation chamber here are prior arts, and their specific positions will not be elaborated further. The automatic rotary surface-changing mechanism is generally arranged on a straight section of the suspension chain conveying path. The suspension chain conveying path includes a suspension chain 21. Below the suspension chain, there is a hanging bracket 22. The suspension main shaft is rotatably connected to the hanging bracket through a bearing 23. The suspension main shaft can rotate driven by a rotating gear 5 and the positioning pin vehicle. Through the rotation of the suspension main shaft, the irradiation container connected below the suspension main shaft can be steered and moved. The suspension chain conveying path also includes a set of roller row tracks 6 cooperating with the automatic rotary surface-changing mechanism.

[0044] Furthermore, the roller row tracks cooperate with the rotating mechanism. On the left and right sides respectively and symmetrically below the positioning pin vehicle, there is a lifting wheel 32. Below the lifting wheel, there is a fixed seat 33. On the suspension chain conveying path, there is a ramp track 7 for the lifting of the lifting wheel. Specifically, the rotating mechanism includes a rotating gear sleeved on the suspension main shaft. The rotating gear can rotate around the suspension main shaft. At the top of the rotating gear, there is a set of positioning pin holes. Positioning pins are arranged in the positioning pin holes. The rotating gear and the positioning pin vehicle are positioned through a positioning pin 31. The ramp track is symmetrically fixed by two light rails. One end of the ramp track has a 15-degree slope, and the other end has a 60-degree slope. The height difference between the two ends is 20 - 40 mm. By setting this height difference, after the lifting wheel is lifted and lowered, the positioning pin vehicle is lifted as a whole, thereby triggering the safety interlock of the travel switch at the corresponding position.

[0045] Embodiment 2

[0046] In implementation, on the premise of ensuring that the on-line space irradiation processing and radiation safety management of the irradiation device are not affected, a suspension chain conveyor line is installed in the top spaces of the product entrances and exits, maze passages, and inspection passages of the irradiation chamber in the invention. The suspension chain is selected according to parameters such as the JB / T9016-2013 standard, the dead weight of the irradiation container, and the maximum load. The materials and strengths of the track and suspension facilities have sufficient radiation resistance characteristics and safety margins. The conveyor line has functions such as forward, backward, uphill, downhill, turning, and mid-stop, forming a circulating closed loop in the offline safe space. Its operation automatic control cabinet is set in the irradiation supervision area to realize the automatic control of the irradiation product transportation. For details, see Figure 5 .

[0047] The irradiation mechanism of the invention can complete the automatic surface-changing action of the irradiation container in the irradiation chamber along the suspension chain transportation path. The irradiation device is made of radiation-resistant metal profiles such as section steel, gears, light rails, and bearings, and is a linkage mechanism that moves along with the suspension chain. Its main components include a suspension main shaft, a rotating gear, a roller track, a positioning pin vehicle, a ramp track, a safety interlock, and other structures. Its specific working principle is as follows: When the automatic surface-changing mechanism is set on a straight line of the transportation loop of the suspension chain transportation path in the irradiation chamber, when the irradiation container enters the control area of this mechanism, the positioning pin vehicle enters the ramp track. After the positioning pin vehicle rises by 30 mm, the travel switch safety interlock can be automatically triggered. Then the positioning pin opens. Next, the rotating gear enters the roller track. Under the pushing action of the roller track, the rotating gear rotates 180°, thereby driving the irradiation container to rotate 180° at the same time. Then the positioning pin vehicle drops 30 mm at the end of the ramp track, triggering the travel switch safety interlock again, causing the positioning pin to close. Finally, the irradiation container automatically rotates 180° and is positioned, and at the same time the irradiation container leaves the rotating mechanism. In fact, this is a set of actions composed of the relative movement of fixed components and moving components, thus completing the automatic surface-changing work of the irradiation container in the irradiation chamber. For details, see Figure 1 .

[0048] Figure 6 Among them, the suspension main shaft is a rotatable through shaft connecting the suspension hanger and the irradiation container, and its material is ordinary carbon steel. Its upper end is connected to the vertical bearing of the suspension hanger, and its lower end is vertically fixedly connected to the irradiation container. The suspension hanger is fixed, and the suspension main shaft and the irradiation container fixedly connected to it are rotatable.

[0049] Figure 7In it, the rotating gear is fixedly connected to the middle of the suspension main shaft by a pin key. It is made of forged steel and drives the suspension main shaft and the irradiation container to rotate simultaneously by meshing with the roller. After the rotating gear rotates 180°, it leaves the roller track and enters the toothless neutral section, and immediately stops rotating to prevent overload. Specifically, after the two lifting wheels at the lower end of the positioning pin vehicle enter the ramp track, the inner sides of the lifting wheels also fit with the set roller track, further helping the rotating gear to rotate and move under the action of the roller track, so that the rotating gear can complete the required 180-degree rotation angle without providing any power.

[0050] Figure 8 In it, the roller track consists of a roller train composed of two groups of rollers, which are fixedly arranged in parallel and symmetrically to form a double-sided track. The effective working length L of the roller track is equal to 1 / 2 of the circumference of the pitch circle of the rotating gear, that is, L = 1 / 2πR. It meshes with the passing gear and plays a role in meshing and pushing the rotating gear. 15° guiding rails 62 are respectively arranged at both ends of the roller track to balance the deviation of the walking line of the rotating gear. The effective length of the roller track here is the length after removing the guiding rails at both ends.

[0051] Figure 9 In it, the positioning pin vehicle consists of a vehicle frame, a positioning pin and lifting wheels. The vehicle frame is movably connected to the suspension main shaft, and the positioning pin and the lifting wheels are fixedly connected to both ends of the vehicle frame. The diameter of the lifting wheel is larger than the height of the track (the height h of a 8 kg light rail can be selected as 65 mm), and it plays a lifting role through the ramp track, driving the positioning pin vehicle to lift, and realizing the opening and closing of the positioning pin.

[0052] Figure 10Among them, the ramp track is symmetrically fixed on both sides by two 8 kg light rails. One end of the track is a 15° ramp, and the other end is 60°. The height difference is plus or minus 30 millimeters, which is the lifting height of the positioning pin vehicle. When the lifting wheel runs on the ramp track, due to the height difference of the ramp track, it will drive the positioning pin vehicle to move up and down, thus touching the travel switch safety interlock to confirm that the positioning pin vehicle has been lifted in place, so as to ensure that the irradiation container rotates in place and is locked. Specifically, the position of the travel switch safety interlock here: The travel switch (A) is set at the starting point of the horizontal track surface of the ramp track. When the lifting wheel of the positioning pin vehicle rises 30 millimeters along the 15° ramp to the track horizontal plane, the positioning pin completely disengages from the pin hole of the rotating gear and reaches the open position, and immediately touches the travel switch contact wheel. The suspension chain and the rotating mechanism control system continue to run according to the normal operation program instructions. Otherwise, it stops running and emits an alarm signal. The travel switch (B) is set at the end of the ramp track. When the lifting wheel of the positioning pin vehicle falls 30 millimeters along the 60° ramp and the positioning pin completely falls back into the positioning pin hole of the rotating gear and locks in place, and immediately touches the travel switch contact wheel, the suspension chain and the rotating mechanism control system continue to run according to the normal operation program instructions. Otherwise, it stops running and emits an alarm signal. The safety interlock consists of two travel switches and a control cabinet, which is interlocked with the suspension chain electrical control cabinet. The working principle will not be elaborated in detail here.

[0053] In specific implementation, after the installation of the present invention is completed, installation verification needs to be carried out and a report needs to be submitted to confirm that the device meets the technical performance requirements and safety performance requirements and can be put into use and operate normally in the irradiation environment. Before irradiation processing, operation verification should be carried out. For example, potassium silver dichromate (HKAgDc) dosimeters and simulated products with representative densities can be used. Load them according to the loading mode of the designed process, place the dosimeters at the dosimeter points of the irradiation container coordinate system established, and conduct dose field tests for offline irradiation. Submit a report based on data statistical analysis to provide technical support for the implementation of the offline irradiation process, so as to realize the safe and effective utilization of the space and rays of the gamma irradiation device offline. Through dose testing and dose field mathematical model estimation, the application of the offline ray utilization device can increase the utilization rate of cobalt source rays by 1-5%.

[0054] Embodiment 3

[0055] A method for using the irradiation mechanism of the offline space and rays of a gamma irradiation device, the method comprising the following steps: a. Install a suspension chain conveying path at the top spaces of the product entrance and exit, the maze, and the inspection passage of the irradiation chamber, and an automatic rotation and surface conversion mechanism is fitted on the suspension chain conveying path; b. A number of irradiation containers are provided in the irradiation chamber, and these irradiation containers are evenly arranged at the irradiation positions on both sides of the source plate in the irradiation chamber; c. The automatic rotation and surface conversion mechanism is arranged on a straight line segment of the suspension chain conveying path. When the irradiation container enters this straight line segment and needs to be rotated, the positioning pin of the automatic rotation and surface conversion mechanism is opened, and the automatic rotation and surface conversion mechanism rotates 180 degrees driven by the rotation gear, thereby driving the irradiation container to complete the rotation, and then the positioning pin is closed, and the irradiation container is disengaged from the automatic rotation and surface conversion mechanism.

[0056] As shown in Figure (1), the working principle of the automatic rotation and surface conversion mechanism is as follows. Among the components of the automatic rotation and surface conversion mechanism, there are a fixed component that plays a fixing role and a walking component that plays a walking role. Here, the fixed component is the ramp track and the stick column, and the walking component is the rotation gear fixed on the top of the irradiation container and fixedly connected to the lower end of the suspension main shaft. The upper end of the suspension main shaft is connected to the suspension chain through a hanger. The positioning pin vehicle is movably connected to the upper part of the rotation gear and the suspension main shaft and can slide up and down along the suspension main shaft to rise and fall. When the walking component travels to the fixed component along with the suspension chain, the positioning pin vehicle is automatically opened, the rotation gear enters the stick column guide rail, and the gear rotation drives the suspension main shaft and the irradiation container to rotate 180 degrees. The lengths of the ramp track and the stick column guide rail are both half of the circumference of the rotation gear. When the rotation action is completed, the positioning pin vehicle falls back to the initial position on the ramp track to lock the position of the irradiation container, and the walking component travels along with the suspension chain and automatically leaves the fixed component.

[0057] Specifically, in step a, the automatic rotation and surface conversion mechanism includes a positioning pin vehicle and a suspension main shaft. One end of the suspension main shaft is arranged on the suspension chain conveying path, and the other end is connected to the irradiation container. A rotation mechanism is provided on the suspension main shaft to enable the irradiation container to perform rotation and surface conversion.

[0058] The suspension chain conveying path is arranged along the top of the entrance and exit of the products in the irradiation chamber, the maze, and the inspection passage, and forms a closed loop; the suspension chain conveying path includes a suspension chain, and a hanging bracket is arranged below the suspension chain. The hanging main shaft is rotatably connected to the hanging bracket through a bearing; the roller row rail cooperates with the rotating mechanism. A lifting wheel is symmetrically arranged on each of the left and right sides below the positioning pin vehicle. A fixed seat is arranged below the lifting wheel. A ramp track for lifting the lifting wheel is arranged on the suspension chain conveying path. After entering the ramp track, the inner side of the lifting wheel fits with the roller row rail, further helping the rotating gear to rotate and move under the action of the roller row rail, so that the rotating gear can complete the required rotation angle without providing any power. Generally, it is set to rotate 180 degrees. If it is in some special positions in the irradiation chamber, the rotation angle required for the rotating gear can be set, such as 90 degrees or 270 degrees.

[0059] In step c, the irradiation container enters below the automatic rotation and surface conversion mechanism and is connected to the automatic rotation and surface conversion mechanism. Then the positioning pin vehicle enters the ramp track, causing the positioning pin vehicle to rise by 30 mm. Then the travel switch safety interlock is triggered, and the positioning pin is opened. Then the rotating gear enters the roller row rail, and the rotating gear rotates 180°. Thereby driving the irradiation container to rotate 180° at the same time. Then the positioning pin vehicle drops 30 mm at the end of the ramp track. Then the travel switch safety interlock is triggered, and the positioning pin is closed. The irradiation container automatically rotates 180° and is positioned. Finally, the irradiation container leaves the automatic rotation and surface conversion mechanism. The automatic rotation and surface conversion mechanism is arranged on a straight line segment of the suspension chain conveying path, and this straight line segment is located on both sides and the end of the source plate in the irradiation chamber.

[0060] The above content is a further detailed description of the present invention in combination with specific preferred implementation manners. It cannot be determined that the specific implementation of the present invention is only limited to the above descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, several simple deductions or substitutions can still be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. An irradiation mechanism that utilizes the offline space and rays of a gamma irradiation device, characterized in that: The irradiation device includes a closed suspension chain conveying path and an automatic rotary surface-changing mechanism cooperating with the suspension chain conveying path. A detachable irradiation container is suspended below the automatic rotary surface-changing mechanism; the automatic rotary surface-changing mechanism includes a positioning pin vehicle and a suspension main shaft. One end of the suspension main shaft is arranged on the suspension chain conveying path, and the other end is connected to the irradiation container. A rotating mechanism is provided on the suspension main shaft to drive the irradiation container to rotate and change its surface. The suspension chain conveying path is arranged along the top of the product entrance and exit, maze, and inspection passage of the irradiation chamber and forms a closed loop; the suspension chain conveying path includes a suspension chain. A hanger is provided below the suspension chain. The suspension main shaft is rotatably connected to the hanger through a bearing. The suspension chain conveying path also includes a set of roller track rows cooperating with the automatic rotary surface-changing mechanism; the rotating mechanism includes a rotating gear sleeved on the suspension main shaft. The roller track row consists of two groups of rollers to form a roller track row, which is symmetrically fixed in parallel to form a double-sided track. The effective working length L of the roller track row is equal to 1 / 2 of the pitch circle circumference of the rotating gear. The roller track row meshes with the gear to push the rotating gear; 15° guiding tracks are respectively provided at both ends of the roller track row to balance the deviation of the walking line of the rotating gear. The roller track row cooperates with the rotating mechanism. A lifting wheel is symmetrically provided on each of the left and right sides below the positioning pin vehicle. A fixed seat is provided below the lifting wheel. A ramp track for the lifting of the lifting wheel is provided on the suspension chain conveying path; after the two lifting wheels enter the ramp track, the inner sides of the lifting wheels are in contact with the roller track row, so that the rotating gear rotates and travels under the action of the roller track row, completing a 180-degree rotation angle. The ramp track is symmetrically fixed by two light rails. One end of the ramp track is provided with a 15-degree ramp, and the other end is provided with a 60-degree ramp; the height difference between the two ends is 20 - 40 mm. Through this height difference, after the lifting wheel is lifted and lowered, the positioning pin vehicle is lifted as a whole, thereby triggering the safety interlock of the travel switch at the corresponding position.

2. The irradiation mechanism of the offline space and rays using a gamma irradiation device according to claim 1, characterized in that: The rotating gear can rotate around the suspension main shaft. A set of positioning pin holes is provided at the top of the rotating gear. A positioning pin is provided in the positioning pin holes. The rotating gear and the positioning pin vehicle are positioned through the positioning pin.

3. The usage method of an irradiation mechanism for the offline space and rays of a gamma irradiation device according to claim 1, characterized in that: The described usage method includes the following steps: a. Install the suspension chain conveying path in the top space of the product entrance and exit, maze, and irradiation chamber inspection passage of the irradiation chamber, and the automatic rotary surface-changing mechanism is cooperated on the suspension chain conveying path; b. Several irradiation containers are provided in the irradiation chamber, and these irradiation containers are evenly arranged at the irradiation positions on both sides of the source plate in the irradiation chamber; c. The automatic rotary surface-changing mechanism is arranged on a straight line segment of the suspension chain conveying path. When the irradiation container needs to rotate when entering this straight line segment, the automatic rotary surface-changing mechanism opens the positioning pin. The automatic rotary surface-changing mechanism rotates 180 degrees driven by the rotating gear, thereby driving the irradiation container to complete the rotation. Then the positioning pin is closed, and the irradiation container is separated from the automatic rotary surface-changing mechanism.

4. The usage method of an irradiation mechanism for the offline space and rays of a gamma irradiation device according to claim 3, characterized in that: In step a, the automatic rotary surface-changing mechanism includes a locating pin vehicle and a suspension main shaft. One end of the suspension main shaft is arranged on the suspension chain conveying path, and the other end is connected to the irradiation container. A rotating mechanism is provided on the suspension main shaft to drive the irradiation container to rotate and change its surface.

5. The usage method of an irradiation mechanism of the offline space and rays using a gamma irradiation device according to claim 3, characterized in that: In step a, the suspension chain conveying path is arranged along the top of the product inlet and outlet, the maze and the inspection passage of the irradiation chamber and forms a closed loop; the suspension chain conveying path includes a suspension chain, and a hanger is arranged below the suspension chain. The suspension main shaft is rotatably connected to the hanger through a bearing. The suspension chain conveying path also includes a set of roller row rails that cooperate with the automatic rotary surface-changing mechanism; the roller row rails cooperate with the rotating mechanism. A lifting wheel is symmetrically arranged on each of the left and right sides below the locating pin vehicle, and a fixed seat is arranged below the lifting wheel. A ramp track for the lifting of the lifting wheel is arranged on the suspension chain conveying path.

6. The method of using the irradiation mechanism of the offline space and rays of a gamma irradiation device according to claim 3, characterized in that: In step c, the irradiation container enters below the automatic rotary surface-changing mechanism and is connected to the automatic rotary surface-changing mechanism. Then the locating pin vehicle enters the ramp track, causing the locating pin vehicle to rise by 30 mm. Then the travel switch safety interlock is triggered, and the locating pin is opened. Then the rotating gear enters the roller row rail, and the rotating gear rotates 180°, thereby driving the irradiation container to rotate 180° simultaneously. Then the locating pin vehicle drops 30 mm at the end of the ramp track. Then the travel switch safety interlock is triggered, and the locating pin is closed. The irradiation container automatically rotates 180° and is positioned. Finally, the irradiation container leaves the automatic rotary surface-changing mechanism.

7. A method for using the irradiation mechanism of the offline space and rays of a gamma irradiation device according to claim 3, characterized in that: In step c, the automatic rotary surface-changing mechanism is arranged on a straight line segment of the suspension chain conveying path, and this straight line segment is located on both sides and at the ends of the inner source plate in the irradiation chamber.

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