Automatic filling device for radioactive particles

Abstract

The invention discloses an automatic filling device for radioactive particles, and the device comprises a particle sorting mechanism which is used for sorting the radioactive particles; the cartridge holder mounting mechanism is used for mounting a cartridge holder so as to fill the radioactive particles sequenced by the particle sequencing mechanism; the particle conveying mechanism is used for receiving the radioactive particles sorted by the particle sorting mechanism and conveying the radioactive particles to a filling position of the cartridge holder mounting mechanism; the particle pushing mechanism is used for pushing the radioactive particles conveyed by the particle conveying mechanism into the cartridge holder; the cartridge holder control mechanism is used for enabling the cartridge holder to make a particle filling position so as to receive the radioactive particles pushed by the particle pushing mechanism; the particle blocking mechanism is mounted on the cartridge holder mounting mechanism and is used for opening or closing a discharge hole of the particle sorting mechanism; the particle sorting mechanism, the particle conveying mechanism, the particle pushing mechanism and the cartridge holder control mechanism are in signal connection with the control unit. According to the automatic filling device provided by the invention, the particle filling efficiency and safety can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to an automatic filling device for radioactive particles. Background Art

[0002] Malignant tumors and cancers have always been major threats to human health. Radioactive seed implantation, a form of brachytherapy, is widely used to treat various tumors, including prostate cancer, breast cancer, liver cancer, ovarian cancer, brain tumors, and orbital tumors. Numerous clinical trials have demonstrated its safety, reliability, efficacy, and minimal damage to normal tissue, demonstrating its broad application prospects. The basic principle is to implant a radioactive source within the tumor, which emits radiation as it decays, providing continuous close-range irradiation to the tumor cells.

[0003] Commonly used radioactive seeds are sealed 125I seed sources, but other sealed sources, such as 103Pd, are also available. These are typically enclosed in a medical titanium tube, sealed without holes, with smooth ends. They typically measure 0.8±0.03mm in diameter and 4.5±0.2mm in length, with an overall cylindrical shape. During radioactive seed implantation, imaging techniques such as CT, MRI, and ultrasound are used to determine the number and location of the radioactive seeds to be implanted. The desired number of radioactive seeds is then loaded into multiple magazines, which are then installed in a radioactive seed implantation gun. The gun then uses the multiple seeds, one by one, to be implanted into the patient's malignant tumor via a puncture needle. Once the seeds in a single magazine are used up, a new magazine containing the seeds is replaced.

[0004] At present, most of the loading of radioactive particle magazines is done manually. The operator wears lead gloves and stands behind lead glass. He uses tweezers to grasp the middle position of the radioactive particles and puts the particles one by one into the opening of the channel slot of the particle bin. He then pulls the particles down along the channel slot of the particle bin and stacks the particles in the channel slot in turn until the predetermined number of radioactive particles is loaded into the particle bin. Radioactive particles are small in size and emit radiation. Medical staff need to wear lead gloves and use long-handled tweezers to pick up the particles when loading them, which makes the operation inconvenient and inefficient. Particles are very likely to fall, causing the loss of the radioactive source or affecting the loading efficiency, thereby increasing the cumulative radiation dose. The channel slots of the particle bin are designed to effectively limit the particles from stacking stably along the slots. The size of the slots matches the particles, making particle loading difficult. Careless operation may cause the particles to fall in the slots. If not handled, the particles may get stuck in the implantation gun during surgery, causing radioactive contamination. To handle the problem, all the loaded particles need to be removed and reloaded. At the same time, it is also easy to cause eye fatigue, resulting in errors in the loading quantity, which leads to errors in the number of particles implanted and surgical operation errors. Operators who load particles are exposed to radiation environments for long periods of time and multiple times, which poses an occupational hazard to the particle loading operators.

[0005] Patent publication number CN119280708A discloses an automatic radioactive particle loading device and method. During the process of transporting the radioactive particles from the vibrating mechanism to the hopper mechanism and the manual replenishment of materials into the chamber, the radioactive particles are in a free-fall state. This free-fall of the particles may cause damage to the particles, affecting the therapeutic effect. Furthermore, when the free-falling particles fall into the hopper, there is a risk of particle stacking, making it impossible to sort them as designed. Furthermore, the particle magazine has a large opening and poor radiation shielding, which may increase the risk of radiation exposure to relevant personnel during the loading and transportation process. Summary of the Invention

[0006] The present invention aims to provide an automatic loading device for radioactive particles, which can realize automatic loading of radioactive particles and improve work efficiency and safety performance.

[0007] Based on the above problems, the technical solution provided by the present invention is:

[0008] Automatic loading device for radioactive particles, comprising:

[0009] a particle sorting mechanism for sorting radioactive particles;

[0010] a magazine installation mechanism, used for installing a magazine to load the radioactive particles sorted by the particle sorting mechanism;

[0011] a particle transport mechanism, configured to receive the radioactive particles sorted by the particle sorting mechanism and transport the radioactive particles to a loading position of the magazine installation mechanism;

[0012] a particle pushing mechanism, for pushing the radioactive particles transported by the particle transport mechanism into the magazine;

[0013] a magazine control mechanism, configured to control the magazine to vacate the particle loading position to receive the radioactive particles pushed by the particle pushing mechanism;

[0014] a particle blocking mechanism, which is mounted on the clip mounting mechanism and is used to open or close the discharge port of the particle sorting mechanism;

[0015] The control unit is connected to the particle sorting mechanism, the particle transport mechanism, the particle pushing mechanism, and the magazine control mechanism respectively through signal connections with the control unit.

[0016] In some embodiments, the particle sorting mechanism includes a vibration component, a vibration disk mounted on the vibration component, a shielding cover covering the vibration disk, and a particle replenishment channel mounted on the shielding cover;

[0017] The vibrating plate includes a storage bin, a sorting channel arranged around the storage bin, and a discharge port arranged outside the storage bin, wherein the sorting channel rises in a spiral shape and is connected to the discharge port, and the discharge port is arranged horizontally and configured to allow one radioactive particle to pass through;

[0018] The accommodating bin is provided with a spirally rising protrusion in the circumference thereof, and the sorting channel is formed between the protrusion and the outer wall of the vibration plate.

[0019] In some embodiments, the particle replenishment channel is a spiral horn structure, the upper end of the particle replenishment channel is a particle inlet and the lower end is provided with a baffle, and the particle outlet is provided on the lower side of the particle replenishment channel.

[0020] In some embodiments, the particle transport mechanism includes a transport support assembly, a particle transport block slidably disposed on the transport support assembly, and a transport drive unit for driving the particle transport block to move;

[0021] The particle transport block is provided with particle receiving holes arranged in a horizontal direction, and the transport support assembly is equipped with a particle arrival detection component for detecting whether the particle receiving holes are filled with radioactive particles. The particle transport block has a material receiving position and a material pushing position. When the particle transport block is in the material receiving position, the particle receiving hole is coaxially arranged with the material discharge port. When the particle transport block is in the material pushing position, the particle pushing mechanism pushes the radioactive particles in the particle receiving hole into the magazine.

[0022] The transport drive unit includes a first screw motor and a transport adapter block connected to a nut of the first screw motor. The particle transport block is connected to the transport adapter block via a transport connector. The transport connector is slidably matched with the transport support assembly via a first guide rail assembly.

[0023] In some embodiments, the particle pushing mechanism includes a pushing support assembly, a particle pushing pin assembly slidably disposed on the pushing support assembly, and a pushing drive unit for driving the particle pushing pin assembly to move;

[0024] The particle push pin assembly includes a push pin mounting part, a particle push pin mounted on the push pin mounting part and extending in a horizontal direction, and a push pin detection part for detecting whether the push pin channel is unobstructed;

[0025] The pusher drive unit includes a second screw motor and a pusher adapter block connected to a nut of the second screw motor. The pusher needle mounting member is fixedly connected to the pusher adapter block. The pusher adapter block is slidably connected to the pusher support assembly via a second guide rail assembly.

[0026] In some embodiments, the magazine mounting mechanism includes a magazine mounting plate, a spring fixing shaft installed in the magazine mounting plate and moving in the horizontal direction, a fixing shaft adapter assembly fixedly connected to the spring fixing shaft and extending outside the magazine mounting plate, and a cam adapter assembly installed on the magazine mounting plate. The spring fixing shaft has a tendency to approach the magazine position in an initial state, and the cam adapter assembly, driven by the magazine control mechanism, moves the spring fixing shaft away from the magazine position.

[0027] In some embodiments, the fixed shaft adapter assembly includes a fixed shaft adapter block and a group of rolling elements mounted on the fixed shaft adapter block and arranged opposite to each other;

[0028] The cam adapter assembly includes two first guide members fixed on the magazine mounting plate, a cam adapter slidably set on the first guide members, and a cam connecting shaft fixedly connected to the cam adapter. The cam adapter abuts against the group of rolling members, and the cam connecting shaft cooperates with the magazine control mechanism.

[0029] In some embodiments, the magazine control mechanism includes a magazine drive support assembly, a magazine drive unit mounted on the magazine drive support assembly, an ejector pin fixing plate drivingly connected to the magazine drive unit, and a magazine ejector pin mounted on the ejector pin fixing plate, wherein the ejector pin fixing plate is provided with a groove that cooperates with the cam adapter shaft;

[0030] The magazine drive unit includes a third screw motor and a magazine power adapter connected to a nut of the third screw motor. The ejector fixing plate is fixedly connected to the magazine power adapter via a connecting member.

[0031] In some embodiments, the magazine includes a magazine sleeve, a particle bin mounted on the upper end of the magazine sleeve, a magazine shield detachably mounted on the magazine sleeve and covering the particle bin, a particle ejector pin inserted into the magazine sleeve and extending into the particle bin, a magazine spring disposed between the particle ejector pin and the magazine sleeve, and a limiter for restricting the particle ejector pin in the magazine sleeve.

[0032] The particle storage bin is provided in the particle bin and a particle channel extending horizontally therethrough is provided on the upper portion thereof, and the particle ejector pin is close to the particle channel and blocks the particle channel under the action of the clip spring;

[0033] The magazine sleeve is provided with an ejector pin through hole for the magazine ejector pin to extend into. When the ejector pin fixing plate descends, the magazine ejector pin is driven to descend so that the particle ejector pin descends to make way for the particle passage.

[0034] In some embodiments, the particle ejector pin comprises a pin body, a particle top part arranged at the upper end of the pin body, a limiting step arranged on the pin body and protruding outward, and a limiting groove arranged at the lower end of the pin body, the ejector spring is abutted between the limiting step and the ejector sleeve, the ejector pin is abutted on the limiting step after descending, and the limiting part is a snap spring and is clamped in the limiting groove.

[0035] In some embodiments, the particle blocking mechanism comprises a guide shaft assembly mounted on the ejector mounting plate and a particle blocking block mounted on the guide shaft assembly, the guide shaft assembly comprises at least one guide shaft penetrating through the ejector mounting plate and a guide spring arranged between the guide shaft and the ejector mounting plate, and the guide spring makes the particle blocking block abut against the discharge port to block the discharge port.

[0036] In some embodiments, the guide shaft comprises a first guide part and a second guide part connected in sequence, the first guide part is slidingly arranged in the ejector mounting plate and has an outer diameter larger than the second guide part, the second guide part penetrates through the ejector mounting plate and extends to the outside of the ejector mounting plate to be connected with the particle blocking block, and the guide spring is abutted between the ejector mounting plate and the first guide part.

[0037] The particle blocking block comprises a body part, a connecting part and a blocking part, the connecting part is connected with the body part in L shape and is fixedly connected with the outer end of the second guide part, the blocking part is in L shape, the first end surface of the blocking part away from the connecting part is matched with the discharge port, and the second end surface of the blocking part facing the ejector mounting plate is matched with the particle conveying block, and the ejector mounting plate is provided with a avoiding sliding groove for placing the particle conveying block.

[0038] Compared with the prior art, the present application has the following advantages:

[0039] 1. The particle loading process can realize automatic loading from particle supplementing, sorting, conveying to pushing, improve the loading efficiency, and the particles are gently and not impacted when descending in the interior, so that the particles can be protected from being damaged.

[0040] 2. The particles are kept in parts with certain wall thickness during the particle loading process, so that the radiation exposure risk can be reduced and the safety of loading can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. The drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0042] Figure 1 Schematic diagram of the structure of an embodiment of an automatic loading device for radioactive particles according to the present invention;

[0043] Figure 2 This is a schematic diagram of the appearance structure of an embodiment of the present invention;

[0044] Figure 3 Schematic diagram of the structure of the particle sorting mechanism in an embodiment of the present invention;

[0045] Figure 4 This is one of the structural diagrams of the vibration plate in the embodiment of the present invention;

[0046] Figure 5 This is the second structural diagram of the vibration plate in the embodiment of the present invention;

[0047] Figure 6 Schematic diagram of the cross-sectional structure of the vibration plate in an embodiment of the present invention;

[0048] Figure 7 Schematic diagram of the structure of the particle replenishment channel in an embodiment of the present invention;

[0049] Figure 8 Schematic diagram of the structure of the particle transport mechanism in an embodiment of the present invention;

[0050] Figure 9 Schematic diagram of the structure of the particle transport block in an embodiment of the present invention;

[0051] Figure 10 Schematic diagram of the structure of the particle pushing mechanism in an embodiment of the present invention;

[0052] Figure 11 This is a structural diagram of a magazine mounting mechanism according to an embodiment of the present invention;

[0053] Figure 12 This is a second structural diagram of the magazine installation mechanism according to an embodiment of the present invention;

[0054] Figure 13 Schematic diagram of the cross-sectional structure of the magazine mounting mechanism according to an embodiment of the present invention;

[0055] Figure 14 This is a schematic structural diagram of a magazine fixing shaft according to an embodiment of the present invention;

[0056] Figure 15 Schematic diagram of the structure of the magazine in an embodiment of the present invention;

[0057] Figure 16 Schematic diagram of the structure of the particle ejector in an embodiment of the present invention;

[0058] Figure 17Schematic diagram of the structure of the magazine ejector pin and the magazine in accordance with an embodiment of the present invention;

[0059] Figure 18 Schematic diagram of the structure of the magazine control mechanism in an embodiment of the present invention;

[0060] Figure 19 Schematic diagram of the structure of the particle blocking mechanism in an embodiment of the present invention;

[0061] Figure 20 Schematic diagram of the structure of the particle blocking block in an embodiment of the present invention;

[0062] Figure 21 This is a schematic diagram of the structure of the particle transport block and the discharge port in an embodiment of the present invention;

[0063] Figure 22 for Figure 21 A partial enlarged view of point I in the middle;

[0064] Figure 23 This is a schematic diagram of the structure of a particle push pin pushing particles into a magazine in an embodiment of the present invention;

[0065] Figure 24 for Figure 23 A partial enlarged view of point H in the middle;

[0066] in:

[0067] 100, particle sorting mechanism; 101, vibration plate; 101a, storage chamber; 101b, raised portion; 101c, sorting channel; 101d, discharge port; 102, shielding cover; 103, particle replenishing channel; 103a, particle inlet; 103b, particle outlet; 103c, baffle; 103d, fixing plate; 104, shielding support plate; 105, shielding support column; 106, vibration source; 107, X-axis slide; 108, Y-axis slide; 109, Z-axis slide;

[0068] 200, particle transport mechanism; 201, first support plate; 202, first connecting plate; 202a, guide sleeve; 203, first lead screw motor; 204, transport adapter block; 205, transport connector; 206, particle transport block; 206a, particle receiving hole; 206b, particle detection hole; 207, particle arrival detection component; 208, first guide rail; 209, first slider; 210, transport detection component;

[0069] 300, particle pushing mechanism; 301, second support plate; 302, second connecting plate; 303, second screw motor; 304, pushing adapter block; 305, push pin mounting member; 306, particle pushing pin; 307, pushing detection component; 308, second guide rail; 309, second slider; 310, pushing position detection component;

[0070] 400, magazine mounting mechanism; 401, magazine mounting plate; 401a, avoidance groove; 401b, particle pushing channel; 402, magazine fixing shaft; 402a, first shaft portion; 402b, second shaft portion; 402c, third shaft portion; 402d, positioning protrusion; 403, fixed shaft spring; 404, fixed shaft adapter block; 405, rolling element; 406, cam adapter; 406a, abutment portion; 407, first A guide member; 408, a cam connecting shaft; 409, a positioning plunger; 410, a magazine detection component; 411, a particle chamber; 411a, a particle storage chamber; 411b, a particle channel; 412, a magazine sleeve; 413, a magazine shield; 414, a particle ejector pin; 414a, an ejector pin body; 414b, a particle ejector portion; 414c, a limiting boss; 414d, a limiting groove; 415, a magazine spring; 416, an end plate;

[0071] 500, magazine control mechanism; 501, magazine drive support assembly; 502, third screw motor; 503, magazine power adapter; 504, ejector pin fixing plate; 504a, groove; 505, second guide member; 506, magazine ejector pin detection component; 507, magazine ejector pin;

[0072] 600, particle blocking mechanism; 601, guide shaft; 601a, first guide portion; 601b, second guide portion; 602, guide spring; 603, particle blocking block; 603a, main body; 603b, connecting portion; 603c, blocking portion; 603c1, first end surface; 603c2, second end surface;

[0073] 700, base;

[0074] 800, control unit;

[0075] 900, housing mechanism; 901, housing; 902, touch screen; 903, emergency stop button; 904, start button; 905, fault confirmation button; 906, particle replenishment hatch; 907, magazine installation hatch; 908, magazine manual release hatch;

[0076] 10. Radioactive particles. DETAILED DESCRIPTION

[0077] The above scheme is further described below in conjunction with specific examples. It should be understood that these examples are used to illustrate the present invention and are not intended to limit the scope of the present invention. The implementation conditions adopted in the examples can be further adjusted according to the conditions of the specific manufacturer. The implementation conditions not specified are generally those in routine experiments.

[0078] like Figure 1As shown, an embodiment of the present invention provides an automatic loading device for radioactive particles, including a base 700, a shell mechanism 900, and a particle sorting mechanism 100, a clip installation mechanism 400, a particle transport mechanism 200, a particle pushing mechanism 300, a clip control mechanism 500, a particle blocking mechanism 600 and a control unit 800 installed on the base 700, wherein the particle sorting mechanism 100, the particle transport mechanism 200, the particle pushing mechanism 300, and the clip control mechanism 500 are respectively connected to the control unit 800 by signal to realize automatic loading of radioactive particles 10.

[0079] like Figure 2 As shown, the housing mechanism 900 includes a housing 901, a touch screen 902 disposed on the housing 901, an emergency stop button 903, a start button 904, a fault confirmation button 905, a particle replenishment hatch 906, a particle replenishment hatch switch detection component, a magazine installation hatch 907, a magazine hatch switch detection component, and a magazine manual release hatch 908. The touch screen 902, the emergency stop button 903, the start button 904, the fault confirmation button 905, the particle replenishment hatch switch detection component, and the magazine hatch switch detection component are respectively connected to the control unit 700 for signal transmission. This is prior art and will not be described in detail in the present invention.

[0080] An emergency stop button 903, a start button 904, and a fault confirmation button 905 are located on the front of the housing 901, to the right of the touch screen 902. The emergency stop button 903 is located at the top and is used to temporarily stop the device in an emergency. The start button 904 and the fault confirmation button 905 control the start and pause of the device's operation, as well as fault confirmation and elimination, respectively. The power port is installed at the lower right front side of the housing 901. It is a power interface with a switch that connects to an external power supply via a power cord to power the device. The particle replenishment hatch 906 is a sliding door that moves horizontally, with a round handle for easy operation. The particle replenishment hatch 906 is located on the top of the housing 901 and has two positions: open and closed. When the particle replenishment hatch 906 is in the open position, particles can be added to the device. When the particle replenishment hatch 906 is in the closed position, particles cannot be added to the device, and foreign matter is prevented from entering the device. The particle replenishment hatch switch detection sensor is mounted on the housing 901, directly below the closed position of the particle replenishment hatch 906, and is used to detect the open or closed status of the particle replenishment hatch 906. The magazine installation hatch switch detection sensor is mounted on the front of the housing 901, located in the closed position of the magazine installation hatch 907, and is used to detect the open or closed status of the magazine installation hatch 907.

[0081] The particle sorting mechanism 100 is used to sort the radioactive particles 10, such as Figure 3As shown, it includes a vibration component, a vibration disk 101 installed on the vibration component, a shielding cover covered on the vibration disk 101 and a particle replenishing channel 103 installed on the shielding cover. Radioactive particles 10 are filled into the vibration disk 101 through the particle replenishing channel 103, and the vibration component drives the vibration disk 101 to vibrate to sort the radioactive particles 10.

[0082] like Figures 4 to 6 As shown, the vibration disk 101 includes a containing bin 101a, a sorting channel 101c arranged around the containing bin 101a, and a discharge port 101d arranged outside the containing bin 101a. The sorting channel 101c rises in a spiral and is connected to the discharge port 101d. The discharge port 101d is arranged in a horizontal direction and is configured to allow a radioactive particle 10 to pass through. Specifically, a spirally rising protrusion 101b is provided around the containing bin 101a. The sorting channel 101c is formed between the protrusion 101b and the outer wall of the vibration disk 101. The entrance of the sorting channel 101c is connected to the bottom of the containing bin 101a. The radioactive particles 10 in the containing bin 101a can smoothly enter the sorting channel 101c and move forward to the discharge port 101d of the sorting channel 101c. The end point of the sorting channel 101c is a discharge structure. When there are stacked or sticky radioactive particles 10 accumulated at the discharge port, because the side wall of the vibration plate 101 is higher than the position in front of the end point of the sorting channel 101c, the stacked or sticky radioactive particles 10 behind the sorting channel 101c will pass over the protrusion 101b and return to the containing chamber 101a for re-sorting.

[0083] The vibration assembly includes a vibration adjustment module and a vibration source 106 installed on the vibration adjustment module. The vibration adjustment module includes an X-axis slide 107, a Y-axis slide 108 and a Z-axis slide 109. The vibration source 106 is connected to the control unit 700 by signal. The X-axis slide 107, the Y-axis slide 108 and the Z-axis slide 109 can realize the adjustment of the position of the vibration disk 101 in the front and back, left and right, and up and down directions. The X-axis slide 107, the Y-axis slide 108 and the Z-axis slide 109 are prior art and will not be described in detail in the present invention. The vibration source 106 can be a circular vibrating screen or a linear vibrating screen. The circular vibrating screen is a power source that generates a rotational force by driving an eccentric block through a motor. The linear vibrating screen is a power source that generates a resultant force in a linear direction by two symmetrically mounted vibration motors. The horizontal components of the two forces cancel each other out, and the vertical components are superimposed. This solution preferably uses a circular vibrating screen as the vibration source 106.

[0084] The shielding cover includes a shielding housing 102 and a shielding support plate 104 disposed around the outer periphery of the shielding housing 102. The shielding support plate 104 is supported on the base 700 via a plurality of shielding support columns 105 arranged around the outer periphery of the vibration disk 101. The shielding housing 102 covers the outer periphery of the vibration disk 101. The shielding support plate 104 and the upper ends of the shielding support columns 105 are fastened with nuts. The lower ends of the shielding support columns 105 are threadedly connected to the positioning nuts on the base 700, thereby fixing the shielding cover above the vibration disk 101 to reduce radiation leakage.

[0085] like Figure 7 As shown, the particle replenishment channel 103 is a spiral horn structure, the upper end of the particle replenishment channel 103 is a particle inlet 103a and the lower end is provided with a baffle 103c, and a particle outlet 103b is provided on the lower side of the particle replenishment channel 103, the particle inlet 103a is located above the shielding cover 102, and the particle outlet 103b extends into the containing bin 101a. The baffle structure at the lower end of the particle replenishment channel 103 decelerates the falling particles to prevent the particles from hitting the surface of the vibration disk 101 too fast and flying out of the vibration disk 101 due to excessive kinetic energy, and a fixed plate 103d is provided in the middle of the particle replenishment channel 103, and the fixed plate 103d is fixed to the shielding cover 102 by screws.

[0086] The particle transport mechanism 200 is used to receive the radioactive particles 10 sorted by the particle sorting mechanism 100 and transport the radioactive particles 10 to the particle pushing channel 401b of the magazine mounting structure 400. Figure 8 As shown, it includes a transport support component, a particle transport block 206 slidingly set on the transport support component and a transport drive unit for driving the particle transport block 206 to move. The transport drive unit drives the particle transport block 206 to move to the material receiving position of the discharge port 101d of the particle sorting mechanism 100 or to the material pushing position.

[0087] like Figure 9 As shown, the particle transport block 206 is provided with horizontally arranged particle receiving holes 206a. A particle presence detection component 207 is mounted on the transport support assembly to detect whether the particle receiving holes 206a are filled with radioactive particles 10. Specifically, the particle transport block 206 is provided with a particle detection hole 206b that connects to the particle receiving holes 206a and extends vertically. The particle detection hole 206b is arranged crosswise with the particle receiving holes 206a. The particle presence detection component 207 detects the presence of particles through the particle detection hole 206b. The particle presence detection component 207 can be a contact sensor, a through-beam sensor, or a slot-type photoelectric switch. Due to the small size of particles and the limited space for sensor installation, the compact slot-type photoelectric switch is preferred.

[0088] The transport support assembly includes two first support plates 201 arranged at intervals along the first direction of the base 700 and a first connecting plate 202 connecting the two first support plates 201. The transport drive unit is installed on the two first support plates 201. The particle transport block 206 is slidingly connected to the first connecting plate 202 via the first guide rail assembly. The first guide rail assembly includes a first guide rail 208 installed on the first connecting plate 202 and a first slider 209 slidingly engaged with the first guide rail 208.

[0089] The transport drive unit includes a first screw motor 203 mounted on two first support plates 201 and a transport adapter block 204 connected to the nut of the first screw motor 203. The particle transport block 206 is connected to the transport adapter block 204 via a transport connector 205. The transport connector 205 is fixed to the first slider 209 and connected to the transport adapter block 204 below the first connecting plate 202 through a slot on the first connecting plate 202. One end of the particle transport block 206 is fixed to the transport connector 205 and extends along the first direction of the base 700. Three transport detection components 210 are arranged at intervals on the first connecting plate 202 along the first direction of the base 700. The middle transport detection component 210 is used to initialize and reset the position of the particle transport block 206. The front and rear transport detection components 210 are used to perform front and rear electrical soft limit on the movement of the particle transport block 206.

[0090] The particle pushing mechanism 300 is used to push the radioactive particles 10 transported by the particle transport mechanism 300 into the magazine, such as Figure 10 As shown, it includes a pushing support assembly, a particle pushing pin assembly slidably arranged on the pushing support assembly, and a pushing drive unit for driving the particle pushing pin assembly to move. The particle pushing pin assembly moves along the second direction of the base 700 driven by the pushing drive unit to push the particles in the particle transport block 206 into the magazine through the particle pushing pin assembly, wherein the second direction is perpendicular to the first direction.

[0091] The pusher support assembly includes two second support plates 301 spaced apart along the second direction of the base 700 and a second connecting plate 302 connecting the two second support plates 301. The particle pusher assembly includes a pusher mounting member 305, a particle pusher 306 mounted on the pusher mounting member 305 and extending horizontally along the second direction, and a pusher detection component 307 for detecting whether the pusher channel is unobstructed. The pusher detection component 307 can be a resistive strain gauge force sensor, a piezoelectric force sensor, a capacitive force sensor, an inductive force sensor, or an optical fiber force sensor. Considering accuracy, stability, and cost, this solution prefers a resistive strain gauge sensor as the pusher detection component 307. This sensor is primarily used to determine whether the force applied by the forward radioactive particle 10 to the particle pusher 306 in the pusher channel exceeds a set value, causing deformation of the radioactive particle 10, thereby ensuring that the radioactive particles 10 loaded into the magazine are intact. The pusher detection component 307 is mounted on the pusher mounting member 305 and connected at its other end to the particle pusher 306. The particle pushing needle 306 is a thin and long needle with a step at the end, which is installed on the material pushing detection component 307 and transmits the thrust exerted on the particle to the material pushing detection component 307 in real time during the material pushing process.

[0092] The push drive unit includes a second screw motor 303 and a push adapter block 304 connected to the nut of the second screw motor 303. The push pin mounting member 305 is fixedly connected to the push adapter block 304, wherein the push adapter block 304 is slidably connected to the second connecting plate 302 via a second guide rail assembly. The second guide rail assembly includes a second guide rail 308 mounted on the second connecting plate 302 and a second slider 309 that slidably cooperates with the second guide rail 308. The push adapter block 304 is fixedly connected to the second slider 309. Three push position detection components 310 are arranged at intervals along the second direction on the second connecting plate 302. The middle push position detection component 310 is used to initialize the position of the particle push pin 306 to zero, and the front and rear push position detection components 310 are used to perform front and rear electrical soft limit on the movement of the particle push pin 306.

[0093] The magazine mounting structure 400 is used to mount a magazine to load the radioactive particles sorted by the particle sorting mechanism 100. Figures 11 to 13 As shown, the clip mounting plate 401 includes a spring fixing shaft mounted within the clip mounting plate 401 and movable in the horizontal direction, a fixing shaft adapter assembly fixedly connected to the spring fixing shaft and extending outside the clip mounting plate 401, and a cam adapter assembly mounted on the clip mounting plate 401. The spring fixing shaft tends to approach the clipping position in an initial state, and the cam adapter assembly moves the spring fixing shaft away from the clipping position in the clip control mechanism 500. The clip mounting plate 401 is fixed to one end of the first connecting plate 202.

[0094] likeFigure 14 As shown, the spring fixing shaft includes a clip fixing shaft 402 and a fixed shaft spring 403 sleeved on the clip fixing shaft 402 to move the clip fixing shaft 402 toward the clip position. The clip fixing shaft 402 includes a first shaft portion 402a located in the middle, a second shaft portion 402b located at one end of the first shaft portion 402a close to the clip position, and a third shaft portion 402c located at one end of the first shaft portion 402a away from the clip position. The outer diameter of the first shaft portion 402a is larger than that of the second shaft portion 402b and the third shaft portion 402c. The fixed shaft spring 403 is sleeved on the third shaft portion 402c. An end plate 416 for limiting the clip fixing shaft 402 in the clip mounting plate 401 is provided on the outer side of the clip mounting plate 401. The fixed shaft spring 403 abuts between the first shaft portion 402a and the end plate 416. A positioning protrusion 402d is provided at the outer end of the second shaft portion 402b, which can extend into the clip to position the clip.

[0095] The fixed-axis adapter assembly includes a fixed-axis adapter block 404 fixedly connected to the first shaft portion 402a and a set of rolling elements 405 mounted on and opposite to the fixed-axis adapter block 404. A movable slot is provided on the magazine mounting plate 401 for the fixed-axis adapter block 404 to extend through. Under the action of the cam adapter assembly, the fixed-axis adapter block 404 can move within the movable slot along the extension direction of the spring fixed axis 402. The rolling element 405 includes two bearings disposed on either side of the fixed-axis adapter block 404. The fixed-axis adapter block 404 is provided with a fixed axis extending perpendicular to the extension direction of the spring fixed axis 402, and the two bearings support this fixed axis.

[0096] The cam adapter assembly includes two first guides 407 fixed to the magazine mounting plate 401, a cam adapter 406 slidably mounted on the first guides 407, and a cam connecting shaft 408 fixedly connected to the cam adapter 406. The cam adapter 406 abuts a set of rolling elements 405. The cam connecting shaft 408 cooperates with the magazine control mechanism 500. The magazine control mechanism 500 drives the cam connecting shaft 408 upward, causing the cam adapter 406 to drive the fixed shaft adapter block 404 away from the magazine position, thereby driving the spring fixed shaft 402 away from the magazine position, facilitating magazine installation and removal. Specifically, two abutment portions 406a are provided on the side of the cam adapter 406 facing the rolling elements. Each abutment portion 406a has an inclined surface that is arranged upwardly from the spring fixed shaft 402 toward the magazine position. The inclined surface cooperates with the rolling element 405 to drive the rolling element 405 to move along the extension direction of the spring fixed shaft 402.

[0097] The magazine mounting plate 401 is provided with a magazine mounting opening with an open lower end. A positioning plunger 409 extending into the magazine mounting opening is provided on the side of the magazine mounting plate 401. When a magazine is mounted on the magazine mounting plate 401 through the magazine mounting opening, the positioning plunger 409 initially positions the magazine. When the spring fixing shaft 402 moves toward the magazine, it abuts against the magazine to secure it. To detect whether the magazine is properly installed, a magazine detection component 410 is provided within the magazine mounting opening and is signal-connected to the control unit 800.

[0098] like Figure 15 As shown, the clip includes a clip sleeve 412, a particle chamber 411 mounted on the upper end of the clip sleeve 412, a clip shield 413 detachably mounted on the clip sleeve 412 and covering the particle chamber 411, a particle ejector pin 414 passing through the clip sleeve 412 and extending into the particle chamber 411, a clip spring 415 disposed between the particle ejector pin 414 and the clip sleeve 412, and a stopper that confines the particle ejector pin 414 within the clip sleeve 412. The clip sleeve 412 is a rod-shaped component with a through hole formed therein, and the clip shield 413 is a rod-shaped component with a hollow lower end. The clip shield 413 is threadedly connected to the clip sleeve 412. The clip shield 413 and the clip sleeve 412 accommodate the internal structure and also function to reduce radiation leakage.

[0099] A rectangular particle storage bin 411a is provided in the particle bin 411, and a particle channel 411b extending horizontally is provided on the upper portion of the particle bin 411. The particle channel 411b passes through the upper end of the particle storage bin 411a. The size of the particle channel 411b port is consistent with the size of the positioning protrusion 402d on the clip fixing shaft 402, so that the clip fixing shaft 402 can extend into the particle channel 411 to position the clip and prevent the radioactive particles 10 from being pushed out of the particle channel 411b. A particle pushing channel 401b corresponding to the particle channel 411b is also provided on the clip mounting plate 401. In order to improve the stability of the clip installation, a limit screw is also provided on the clip mounting plate 401, and a limit portion that cooperates with the limit screw is provided on the outer wall of the particle bin 411. Figure 17 As shown, the particle ejector pin 414, under the action of the clip spring 415, approaches the particle passage 411b and blocks the particle passage 411b. When the clip ejector pin 507 descends, it drives the particle ejector pin 414 downward to clear the particle passage 411b, allowing the particle push pin 414 to push the radioactive particles 10 into the particle passage 411a to load the clip. To facilitate the insertion of the clip ejector pin 507 into the clip sleeve 412, a pin hole is provided on the clip sleeve 412 for the insertion of the clip ejector pin 507.

[0100] like Figure 16As shown, the particle ejector 414 includes an ejector body 414a, a particle ejector portion 414b disposed at the upper end of the ejector body 414a, a limiting step 414c disposed on the ejector body 414a and protruding toward the periphery, and a limiting groove 414d disposed at the lower end of the ejector body 414a. A clip spring 415 abuts between the limiting step 414c and the clip sleeve 412. After the clip ejector 507 is lowered, it can abut the limiting step 414c. The limiting member is a retaining spring and is clamped in the limiting groove 414d. The particle ejector portion 414b has a sheet-like structure and can extend into the particle channel 411a to block the particle channel 411a.

[0101] The clip control mechanism 500 is used to control the clip so that the clip can move out of the particle loading position to receive the radioactive particles 10 pushed by the particle pushing mechanism 300. Figure 18 As shown, the clip drive support assembly 501 includes a clip drive unit mounted on the clip drive support assembly 501, an ejector pin fixing plate 504 drivingly connected to the clip drive unit, and a clip ejector pin 507 mounted on the ejector pin fixing plate 504. The ejector pin fixing plate 504 is provided with a groove 504a that cooperates with the cam connecting shaft 408. Preferably, the groove 504a is U-shaped. A limit plate is provided at the upper end of the cam connecting shaft 408. The U-shaped groove 504a cooperates with the limit plate to drive the cam connecting shaft 408 upward. Three clip ejector pin detection components 506 are provided on the first support plate 201, spaced apart in the vertical direction. The middle clip ejector pin detection component 506 is used to initialize the position of the clip ejector pin 507 to zero. The front and rear clip ejector pin detection components 506 are used to electrically limit the movement of the clip ejector pin 507.

[0102] Among them, the magazine drive unit includes a third screw motor 502, a magazine power adapter 503 connected to the nut of the third screw motor 502, and the ejector fixing plate 504 is fixedly connected to the magazine power adapter 503 via a connecting piece. The third screw motor 502 drives the magazine power adapter 503 to move in the vertical direction, thereby driving the ejector fixing plate 504 to move up and down.

[0103] In order to improve the stability of the up and down movement of the ejector fixing plate 504, two second guide members 505 are fixed to the lower end of the ejector fixing plate 504. At the same time, a guide sleeve 202a for the second guide member 505 to pass through is provided on the first connecting plate 202. The movement of the ejector fixing plate 504 is guided by the cooperation between the second guide member 505 and the guide sleeve 202a.

[0104] The particle blocking mechanism 600 is mounted on the clip mounting mechanism 400 and is used to open or close the discharge port 101d of the particle sorting mechanism 100. Figure 19As shown, it includes a guide shaft assembly installed on the magazine mounting plate 401 and a particle blocking block 603 installed on the guide shaft assembly. The guide shaft assembly includes two guide shafts 601 passing through the magazine mounting plate 401 and a guide spring 602 arranged between the guide shaft 601 and the magazine mounting plate 401. The guide spring 602 makes the particle blocking block 603 abut against the discharge port 101d to block the discharge port 101d.

[0105] Specifically, the guide shaft 601 includes a first guide portion 601a and a second guide portion 601b connected in sequence. The first guide portion 601a is slidably arranged in the magazine mounting plate 401 and has an outer diameter larger than the second guide portion 601b. The second guide portion 601b is passed through the magazine mounting plate 401 and extends to the outside of the magazine mounting plate 401 and is connected to the particle block 603. The guide spring 602 abuts between the magazine mounting plate 401 and the first guide portion 601a. ​​In the initial state, The particle receiving hole 206a on the particle transport block 206 is coaxial with the discharge port 101d on the vibration disk 101. The particles in the particle sorting mechanism 100 can enter the particle receiving hole 206a of the particle transport block 206. When the particle transport block 206 moves to the particle blocking block 603 and drives the particle blocking block 603 to move away from the discharge port 101d, the particle blocking block 603 abuts against the discharge port 101d of the particle sorting mechanism 100 under the action of the guide spring 602 to prevent the particles from being discharged.

[0106] like Figure 20 As shown, the particle blocking block 603 includes a main body 603a, a connecting portion 603b and a blocking portion 603c, the connecting portion 603b is connected to the main body 603a in an L-shape and is fixedly connected to the outer end of the second guide portion 601b, the blocking portion 603c is L-shaped, and the first end face 603c1 of the blocking portion 603c facing away from the connecting portion 603b cooperates with the discharge port 101d, and the second end face 603c2 of the blocking portion 603c facing the magazine mounting plate 401 cooperates with the particle transport block 206, wherein the second end face 603c2 and the first end face 603c1 are perpendicular to each other, and an avoidance chute 401a for the particle transport block 206 to be placed is provided on the magazine mounting plate 401, and the avoidance chute 401a extends along the length direction of the guide shaft 601.

[0107] The working principle of the present invention is:

[0108] Manually install the magazine on the magazine installation plate 401, open the particle replenishment hatch 906 on the shell mechanism 900, and the particles enter the storage chamber 101a of the vibration disk 101 after passing through the particle replenishment channel 103. After the equipment is initialized, the particle storage hole 206a on the particle transport block 206 is coaxial with the discharge port 101d on the vibration disk 101 (as shown in FIG. Figure 21 and Figure 22As shown in FIG2 , the vibration source 106 starts to vibrate, and the particles move upward in the sorting channel 101c of the vibration disk 101, pushing the particles to the discharge port 101d and further to the particle receiving hole 206a on the particle transport block 206. The particles are screened at the junction of the sorting channel 101c and the discharge port 101d, and the adsorbed and stacked particles are discharged back to the receiving bin 101a of the vibration disk 101. After the particles enter the particle receiving hole 206a for a distance, the particles cover the particle detection hole 206b and are then After the particle arrival detection component 207 senses it, it transmits a signal to the control unit 800; the vibration disk 101 stops vibrating, and the particle transport block 206 carries the particles away from the discharge port 101d on the vibration disk 101. Under the action of the guide spring 602, the second end face 603c2 of the particle blocking block 603 fits into the particle transport block 206, and the first end face 603c1 of the particle blocking block 603 gradually blocks the discharge port 101d on the vibration disk 101 until the particle blocking block 603 structure reaches the bottom and stops moving.

[0109] The magazine control mechanism 500 begins operating, and the magazine drive unit drives the magazine ejector pin 507 downward until the groove 504a of the ejector pin fixing plate 504 disengages the cam connecting shaft 408. At this point, the cam adapter 406 loses its support force on the fixed shaft adapter block 404, and the magazine fixing shaft 402, acted upon by the fixed shaft spring 403, moves toward the clipping position, securing the magazine. The magazine ejector pin 507 continues to descend, pushing the particle ejector pin 414 downward until the particle-supporting portion 414b is below the particle channel 411b, leaving space for particles to enter the magazine.

[0110] The pushing drive unit of the particle pushing mechanism 300 starts to work, as shown in FIG. Figure 23 and Figure 24 As shown, particle push pin 306 enters particle receiving hole 206a and pushes the particle into particle pushing channel 401b on magazine mounting plate 401, and then into particle channel 411b within the magazine's particle storage compartment 411. During this process, push detection component 307 detects the pressure of radioactive particle 10 on push detection component 307 to determine whether the forward radioactive particle 10 is squeezed in the pushing channel, causing the force to exceed the set value, resulting in deformation of the radioactive particle 10, thereby ensuring that the radioactive particle 10 remains intact. The magazine drive unit of magazine control mechanism 500 operates, driving magazine ejector pin 507 to move downward a certain distance again. The particle that has entered particle channel 411b descends along with particle ejector pin 414 and enters the particle storage compartment 411a.

[0111] The pushing driving unit of the particle pushing mechanism 300 works, the second screw motor 303 reverses to drive the particle pushing needle 306 to exit the particle channel 411b, the particle pushing channel 401b on the clip fixing plate 401 and the particle containing hole 206a on the particle transport block 206, until returning to the waiting pushing position. Then, the transport driving unit works, the first screw motor 203 drives the particle transport block 206 to move from the pushing position to the receiving position, so that the particle containing hole 206a of the particle transport block 206 is in butt joint with the discharge port 101d on the particle sorting mechanism 100 to receive the next radioactive particle 10. Repeat the above steps until the filling of the clip is completed.

[0112] When the number of the supplemented radioactive particles 10 is greater than the filling number of the clip, the clip is taken off, the particle recovery box is installed at the clip installation position, and the remaining particles are transported into the particle recovery box through the above steps.

[0113] In summary, the filling device can realize the automatic filling of the radioactive particles, improve the filling efficiency and safety.

[0114] The above examples are only for illustrating the technical concept and characteristics of the present application, and the purpose is to enable the person skilled in the art to understand the content of the present application and to implement it, and cannot limit the protection scope of the present application. Any equivalent transformation or modification made according to the spirit and essence of the present application shall be covered within the protection scope of the present application.

Claims

1. An automatic loading device for radioactive particles, characterized in that: include: a particle sorting mechanism for sorting radioactive particles; a magazine installation mechanism, used for installing a magazine to load the radioactive particles sorted by the particle sorting mechanism; a particle transport mechanism, configured to receive the radioactive particles sorted by the particle sorting mechanism and transport the radioactive particles to a loading position of the magazine installation mechanism; a particle pushing mechanism, used for pushing the radioactive particles transported by the particle transport mechanism into the magazine; a magazine control mechanism, configured to control the magazine to vacate the particle loading position to receive the radioactive particles pushed by the particle pushing mechanism; a particle blocking mechanism, which is mounted on the clip mounting mechanism and is used to open or close the discharge port of the particle sorting mechanism; The control unit is connected to the particle sorting mechanism, the particle transport mechanism, the particle pushing mechanism, and the magazine control mechanism respectively through signal connections with the control unit.

2. The automatic loading device for radioactive particles according to claim 1, characterized in that: The particle sorting mechanism includes a vibration component, a vibration disk mounted on the vibration component, a shielding cover covering the vibration disk, and a particle replenishing channel mounted on the shielding cover; The vibration plate includes a storage bin, a sorting channel arranged around the storage bin, and a discharge port arranged outside the storage bin. The sorting channel rises in a spiral shape and connects to the discharge port. The discharge port is arranged horizontally and is configured to allow one radioactive particle to pass through.

3. The automatic loading device for radioactive particles according to claim 2, characterized in that: The particle replenishment channel is a spiral horn structure, the upper end of the particle replenishment channel is a particle inlet and the lower end is provided with a baffle, and the lower side of the particle replenishment channel is provided with a particle outlet.

4. The automatic loading device for radioactive particles according to claim 1, characterized in that: The particle transport mechanism includes a transport support assembly, a particle transport block slidably arranged on the transport support assembly, and a transport drive unit for driving the particle transport block to move; The particle transport block is provided with particle receiving holes arranged in a horizontal direction, and the transport support assembly is equipped with a particle arrival detection component for detecting whether the particle receiving holes are filled with radioactive particles. The particle transport block has a material receiving position and a material pushing position. When the particle transport block is in the material receiving position, the particle receiving hole is coaxially arranged with the material discharge port. When the particle transport block is in the material pushing position, the particle pushing mechanism pushes the radioactive particles in the particle receiving hole into the magazine. The transport drive unit includes a first screw motor and a transport adapter block connected to a nut of the first screw motor. The particle transport block is connected to the transport adapter block via a transport connector. The transport connector is slidably matched with the transport support assembly via a first guide rail assembly.

5. The automatic loading device for radioactive particles according to claim 1, characterized in that: The particle pushing mechanism includes a pushing support assembly, a particle pushing pin assembly slidably arranged on the pushing support assembly, and a pushing drive unit for driving the particle pushing pin assembly to move; The particle push pin assembly includes a push pin mounting part, a particle push pin mounted on the push pin mounting part and extending in a horizontal direction, and a push pin detection part for detecting whether the push pin channel is unobstructed; The pusher drive unit includes a second screw motor and a pusher adapter block connected to a nut of the second screw motor. The pusher needle mounting member is fixedly connected to the pusher adapter block. The pusher adapter block is slidably connected to the pusher support assembly via a second guide rail assembly.

6. The automatic loading device for radioactive particles according to claim 1, characterized in that: The magazine mounting mechanism includes a magazine mounting plate, a spring fixing shaft installed in the magazine mounting plate and moving in the horizontal direction, a fixing shaft adapter assembly fixedly connected to the spring fixing shaft and extending outside the magazine mounting plate, and a cam adapter assembly installed on the magazine mounting plate. The spring fixing shaft has a tendency to approach the magazine position in an initial state, and the cam adapter assembly, driven by the magazine control mechanism, causes the spring fixing shaft to move away from the magazine position.

7. The automatic loading device for radioactive particles according to claim 6, characterized in that: The fixed shaft adapter assembly includes a fixed shaft adapter block and a group of rolling elements mounted on the fixed shaft adapter block and arranged opposite to each other; The cam adapter assembly includes two first guide members fixed on the magazine mounting plate, a cam adapter slidably set on the first guide members, and a cam connecting shaft fixedly connected to the cam adapter. The cam adapter abuts against the group of rolling members, and the cam connecting shaft cooperates with the magazine control mechanism.

8. The automatic loading device for radioactive particles according to claim 7, characterized in that: The magazine control mechanism includes a magazine drive support assembly, a magazine drive unit mounted on the magazine drive support assembly, an ejector pin fixing plate drivingly connected to the magazine drive unit, and a magazine ejector pin mounted on the ejector pin fixing plate, wherein the ejector pin fixing plate is provided with a groove that cooperates with the cam adapter shaft; The magazine drive unit includes a third screw motor and a magazine power adapter connected to a nut of the third screw motor. The ejector fixing plate is fixedly connected to the magazine power adapter via a connecting member.

9. The automatic loading device for radioactive particles according to claim 8, characterized in that: The magazine comprises a magazine sleeve, a particle bin mounted on the upper end of the magazine sleeve, a magazine shield detachably mounted on the magazine sleeve and covering the particle bin, a particle ejector pin inserted into the magazine sleeve and extending into the particle bin, a magazine spring disposed between the particle ejector pin and the magazine sleeve, and a limiter for restricting the particle ejector pin in the magazine sleeve; The particle storage bin is provided in the particle bin and a particle channel extending horizontally therethrough is provided on the upper portion thereof, and the particle ejector pin is close to the particle channel and blocks the particle channel under the action of the clip spring; The magazine sleeve is provided with an ejector pin through hole for the magazine ejector pin to extend into. When the ejector pin fixing plate descends, the magazine ejector pin is driven to descend so that the particle ejector pin descends to make way for the particle passage.

10. The automatic loading device for radioactive particles according to claim 9, characterized in that: The particle ejector includes an ejector body, a particle ejecting portion arranged at the upper end of the ejector body, a limiting step arranged on the ejector body and protruding toward the outer periphery, and a limiting groove arranged at the lower end of the ejector body. The clip spring abuts between the limiting step and the clip sleeve. After the clip ejector is lowered, it abuts against the limiting step. The limiting member is a retaining spring and is clamped in the limiting groove.

11. The automatic loading device for radioactive particles according to claim 6, characterized in that: The particle blocking mechanism includes a guide shaft assembly installed on the magazine mounting plate and a particle blocking block installed on the guide shaft assembly. The guide shaft assembly includes at least one guide shaft passing through the magazine mounting plate and a guide spring arranged between the guide shaft and the magazine mounting plate. The guide spring enables the particle blocking block to abut against the discharge port to block the discharge port.

12. The automatic loading device for radioactive particles according to claim 11, characterized in that: The guide shaft includes a first guide portion and a second guide portion connected in sequence, the first guide portion being slidably disposed in the magazine mounting plate and having an outer diameter larger than that of the second guide portion, the second guide portion being passed through the magazine mounting plate and extending outside the magazine mounting plate to be connected to the particle block, the guide spring being abutted between the magazine mounting plate and the first guide portion; The particle blocking block includes a main body, a connecting part and a blocking part. The connecting part is connected to the main body in an L shape and is fixedly connected to the outer end of the second guide part. The blocking part is L-shaped. The first end face of the blocking part is away from the connecting part and cooperates with the discharge port. The second end face of the blocking part faces the magazine mounting plate and cooperates with the particle transport block. The magazine mounting plate is provided with an avoidance groove for the particle transport block to be placed.

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