Automatic loading device for radioactive particles

Abstract

This utility model discloses an automatic loading device for radioactive particles, comprising: a particle sorting mechanism for sorting radioactive particles; a magazine mounting mechanism for mounting a magazine to load the radioactive particles sorted by the particle sorting mechanism; a particle transport mechanism for receiving the radioactive particles sorted by the particle sorting mechanism and transporting the radioactive particles to the loading position of the magazine mounting mechanism; a particle pushing mechanism for pushing the radioactive particles transported by the particle transport mechanism into the magazine; a magazine control mechanism for causing the magazine to move aside to receive the radioactive particles pushed by the particle pushing mechanism; and a particle blocking mechanism, which is mounted on the magazine mounting mechanism and is used to open or close the discharge port of the particle sorting mechanism; the particle sorting mechanism, particle transport mechanism, particle pushing mechanism, and magazine control mechanism are respectively signal-connected to a control unit. The automatic loading device provided by this utility model can improve the efficiency and safety of particle loading.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and in particular to an automatic loading device for radioactive particles. Background Technology

[0002] Malignant tumors and cancers have always been major diseases threatening human health. Radioactive particle implantation surgery, a type of brachytherapy, is widely used to treat various tumors, such as prostate cancer, breast cancer, liver cancer, ovarian cancer, brain tumors, and orbital tumors. Extensive clinical practice has proven its safety, reliability, efficacy, and minimal damage to normal tissues, making it a promising treatment option. Its basic principle involves implanting a radioactive source inside the tumor; upon decay, the source emits radiation, providing continuous, close-range irradiation to the tumor cells.

[0003] The most commonly used radioactive particles are sealed 125I seed sources, but other sealed seed sources such as 103Pd are also used. They are generally encased in a medical-grade titanium tube, sealed without holes, with rounded ends, and typically have a diameter of 0.8±0.03 mm and a length of 4.5±0.2 mm, with an overall cylindrical shape. During radioactive particle implantation surgery, imaging techniques such as CT, MRI, and ultrasound are used to determine the number and location of the radioactive particles to be implanted. The required number of radioactive particles are then loaded into multiple magazines, which are installed in the implantation gun. The implantation gun then inserts multiple particles one by one into the malignant tumor inside the patient's body through a puncture needle. When the particles in a single magazine are used up, a new magazine filled with particles is replaced.

[0004] Currently, most radioactive particle magazines are filled manually. Operators wear lead gloves and stand behind lead glass, using tweezers to pick up the radioactive particles from the middle and put them in one by one through the channel opening of the particle chamber. They then pull the particles down along the channel and stack them in the channel until the particle chamber is filled with the predetermined number of radioactive particles. Radioactive particles are small and emit radiation. Medical staff must wear lead gloves and use long-handled forceps to handle the particles during loading, making the process inconvenient, inefficient, and prone to dropping particles, leading to loss of the radioactive source or affecting loading efficiency, thus increasing the cumulative radiation dose. The channel slots in the particle chamber are designed to effectively restrict the stable stacking of particles within them. The size of the slots is matched to the particles, making particle loading difficult. Careless handling can cause particles to tip over in the slots. If not handled properly, this can lead to particles getting stuck in the implantation gun during surgery, causing radioactive contamination. Handling this requires removing all loaded particles and reloading. Furthermore, it easily causes eye strain, leading to errors in the loading quantity and subsequent surgical errors. Operators loading particles are repeatedly exposed to radiation for extended periods, posing occupational hazards.

[0005] Patent publication CN119280708A discloses an automatic radioactive particle loading device and method. In this method, the radioactive particles are in free fall during the process of being transported from a vibrating mechanism to a funnel mechanism and during the manual replenishment of materials into the hopper. During free fall, the particles may be damaged, affecting the treatment effect. Furthermore, when the free-falling particles enter the funnel, there is a risk of particle stacking, making it impossible to sort them according to the design purpose. On the other hand, the large opening in the particle magazine results in poor radiation shielding, potentially increasing the risk of radiation exposure to personnel during loading and transfer. Utility Model Content

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

[0007] Based on the above problems, the technical solution provided by this utility model is as follows:

[0008] An automated loading device for radioactive particles includes:

[0009] A particle sorting mechanism used to sort radioactive particles;

[0010] A magazine mounting mechanism for mounting a magazine to load radioactive particles sorted by the particle sorting mechanism;

[0011] A particle transport mechanism is used to receive the radioactive particles sorted by the particle sorting mechanism and transport the radioactive particles to the loading position of the magazine mounting mechanism.

[0012] A particle pushing mechanism is used to push radioactive particles transported by the particle transport mechanism into the magazine.

[0013] A magazine control mechanism is used to control the magazine to make it move out of the particle loading position so as to receive the radioactive particles pushed by the particle feeding mechanism.

[0014] A particle blocking mechanism is installed on the magazine 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, particle transport mechanism, particle pusher mechanism, and magazine control mechanism via signals.

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

[0017] The vibratory feeder includes a receiving chamber, a sorting channel arranged around the circumference of the receiving chamber, and a discharge port arranged outside the receiving chamber. The sorting channel rises in a spiral shape and connects to the discharge port. The discharge port is arranged horizontally and configured to allow a radioactive particle to pass through.

[0018] The receiving chamber is provided with a spirally rising protrusion around its circumference, and the sorting channel is formed between the protrusion and the outer wall of the vibrating plate.

[0019] In some embodiments, the particle replenishment channel is a spiral horn structure, with a particle inlet at the upper end and a baffle at the lower end, and a particle outlet 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 a particle receiving hole arranged in a horizontal direction. The transport support assembly is equipped with a particle arrival detection component for detecting whether the particle receiving hole is filled with radioactive particles. The particle transport block has a receiving position and a pushing position. When the particle transport block is in the receiving position, the particle receiving hole is coaxially arranged with the discharge port. When the particle transport block is in the pushing position, the particle pushing mechanism pushes the radioactive particles in the particle receiving hole to the magazine.

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

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

[0024] The particle pusher assembly includes a pusher mounting component, a particle pusher mounted on the pusher mounting component and extending in a horizontal direction, and a pusher detection component for detecting whether the pusher channel is unobstructed.

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

[0026] In some embodiments, the magazine mounting mechanism includes a magazine mounting plate, a spring fixing shaft mounted within the magazine mounting plate and movable in a 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 mounted on the magazine mounting plate. The spring fixing shaft initially tends to move closer to the magazine position, 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 set of rolling elements mounted on the fixed shaft adapter block and disposed opposite to each other;

[0028] The cam adapter assembly includes two first guide members fixed on the magazine mounting plate, a cam adapter slidably disposed on the first guide members, and a cam connecting shaft fixedly connected to the cam adapter. The cam adapter abuts against the set of rolling elements, 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, a ejector pin fixing plate that is drively connected to the magazine drive unit, and a magazine ejector pin mounted on the ejector pin fixing plate. The ejector pin fixing plate is provided with a groove that mates with a cam adapter shaft.

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

[0031] In some embodiments, the magazine includes a magazine sleeve, a particle chamber mounted on the upper end of the magazine sleeve, a magazine shield detachably mounted on the magazine sleeve and covering the particle chamber, a particle ejector pin passing through the magazine sleeve and extending into the particle chamber, a magazine spring disposed between the particle ejector pin and the magazine sleeve, and a limiting member that restricts the particle ejector pin in the magazine sleeve.

[0032] The particle chamber contains a particle storage chamber and has a particle channel extending horizontally at the top. The particle ejector pin approaches the particle channel and blocks the particle channel under the action of the clip spring.

[0033] The magazine sleeve is provided with a pin through hole for the magazine pin to extend into. When the pin fixing plate descends, it drives the magazine pin to cause the particle pin to descend and make way for the particle channel.

[0034] In some embodiments, the particle ejector pin includes an ejector pin body, an ejector particle portion disposed at the upper end of the ejector pin body, a limiting step disposed on the ejector pin body and protruding outward, and a limiting groove disposed at the lower end of the ejector pin body. The clip spring abuts against the limiting step and the clip sleeve. After the clip ejector pin descends, it abuts against the limiting step. The limiting member is a retaining spring and is locked in the limiting groove.

[0035] In some embodiments, the particle blocking mechanism includes a guide shaft assembly mounted on the magazine mounting plate and a particle blocking block mounted 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 disposed between the guide shaft and the magazine mounting plate. The guide spring causes the particle blocking block to abut against the discharge port to block the discharge port.

[0036] In some embodiments, the guide shaft includes a first guide portion and a second guide portion connected in sequence. The first guide portion is slidably disposed inside the magazine mounting plate and has an outer diameter larger than the second guide portion. The second guide portion passes through the magazine mounting plate and extends to the outside of the magazine mounting plate to connect with the deflector block. The guide spring abuts against the magazine mounting plate and the first guide portion.

[0037] The particle blocking block includes a body, a connecting part, and a blocking part. The connecting part is connected to the body in an L-shape and 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 away from the connecting part cooperates with the discharge port. The second end face of the blocking part facing the magazine mounting plate cooperates with the particle transport block. The magazine mounting plate is provided with an avoidance groove for the particle transport block to be inserted.

[0038] Compared with the prior art, the advantages of this utility model are:

[0039] 1. The particle loading process, from particle replenishment, sorting, transportation to pushing, can achieve automatic loading, improve loading efficiency, and the particles descend smoothly without impact, which can protect the particles from damage.

[0040] 2. During the particle loading process, the particles are kept within parts with a certain wall thickness, which can reduce the risk of radiation exposure and improve the safety of loading. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of an embodiment of the automatic loading device for radioactive particles according to the present invention;

[0043] Figure 2 This is a schematic diagram of the external structure of an embodiment of the present utility model;

[0044] Figure 3 This is a schematic diagram of the particle sorting mechanism in an embodiment of the present invention;

[0045] Figure 4 This is one of the structural schematic diagrams of the vibratory feeder in the embodiments of this utility model;

[0046] Figure 5 This is the second schematic diagram of the structure of the vibratory feeder in this embodiment of the present invention;

[0047] Figure 6 This is a cross-sectional structural diagram of the vibratory feeder in an embodiment of the present invention;

[0048] Figure 7 This is a schematic diagram of the particle replenishment channel in an embodiment of the present invention;

[0049] Figure 8 This is a schematic diagram of the particle transport mechanism in an embodiment of the present invention;

[0050] Figure 9 This is a schematic diagram of the particle transport block in an embodiment of the present invention;

[0051] Figure 10 This is a schematic diagram of the particle feeding mechanism in an embodiment of the present invention;

[0052] Figure 11 This is one of the structural schematic diagrams of the magazine mounting mechanism in the embodiments of this utility model;

[0053] Figure 12 This is the second structural schematic diagram of the magazine mounting mechanism in this utility model embodiment;

[0054] Figure 13 This is a cross-sectional structural diagram of the magazine mounting mechanism in an embodiment of this utility model;

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

[0056] Figure 15 This is a schematic diagram of the magazine structure in an embodiment of the present invention;

[0057] Figure 16 This is a schematic diagram of the particle ejector pin in an embodiment of the present invention;

[0058] Figure 17 This is a schematic diagram of the mechanism of the magazine ejector pin and the magazine in an embodiment of this utility model;

[0059] Figure 18 This is a schematic diagram of the magazine control mechanism in an embodiment of the present invention;

[0060] Figure 19 This is a schematic diagram of the particle blocking mechanism in an embodiment of the present invention;

[0061] Figure 20 This is a schematic diagram 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 this utility model;

[0063] Figure 22 for Figure 21 Enlarged view of a section at point I;

[0064] Figure 23 This is a schematic diagram of the structure of the particle pusher pushing particles to the magazine in an embodiment of this utility model;

[0065] Figure 24 for Figure 23 Enlarged view of a section at point H;

[0066] in:

[0067] 100. Particle sorting mechanism; 101. Vibratory feeder; 101a. Receiving bin; 101b. Protrusion; 101c. Sorting channel; 101d. Discharge port; 102. Shielding cover; 103. Particle replenishment 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 table; 108. Y-axis slide table; 109. Z-axis slide table;

[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 feeding mechanism; 301. Second support plate; 302. Second connecting plate; 303. Second lead screw motor; 304. Feeding adapter block; 305. Feeding pin mounting component; 306. Particle feeding pin; 307. Feeding detection component; 308. Second guide rail; 309. Second slider; 310. Feeding position detection component;

[0070] 400. Magazine mounting mechanism; 401. Magazine mounting plate; 401a. Clearance groove; 401b. Particle feeding channel; 402. Magazine fixing shaft; 402a. First shaft portion; 402b. Second shaft portion; 402c. Third shaft portion; 402d. Positioning protrusion; 403. Fixing shaft spring; 404. Fixing shaft adapter block; 405. Rolling element; 406. Cam adapter; 406a. Abutment portion; 407. ... 408. Guide component; 409. Cam connecting shaft; 410. Positioning plunger; 411. Magazine detection component; 411. Particle chamber; 411a. Particle storage chamber; 411b. Particle channel; 412. Magazine sleeve; 413. Magazine shield; 414. Particle ejector pin; 414a. Ejector pin body; 414b. Particle ejector part; 414c. Limiting boss; 414d. Limiting groove; 415. Magazine spring; 416. End plate;

[0071] 500. Magazine control mechanism; 501. Magazine drive support assembly; 502. Third lead screw motor; 503. Magazine power adapter; 504. Ejector pin fixing plate; 504a. Groove; 505. Second guide; 506. Magazine ejector pin detection component; 507. Magazine ejector pin;

[0072] 600, Particle blocking mechanism; 601, Guide shaft; 601a, First guide part; 601b, Second guide part; 602, Guide spring; 603, Particle blocking block; 603a, Body part; 603b, Connecting part; 603c, Blocking part; 603c1, First end face; 603c2, Second end face;

[0073] 700, base;

[0074] 800, Control Unit;

[0075] 900. Outer shell mechanism; 901. Outer shell; 902. Touch screen; 903. Emergency stop button; 904. Start button; 905. Fault confirmation button; 906. Particle replenishment hatch; 907. Magazine mounting hatch; 908. Manual magazine release hatch;

[0076] 10. Radioactive particles. Detailed Implementation

[0077] The above solution will be further described below with reference to specific embodiments. It should be understood that these embodiments are for illustrating the present invention and are not intended to limit the scope of the present invention. The implementation conditions used in the embodiments can be further adjusted according to the conditions of specific manufacturers, and the implementation conditions not specified are usually the conditions in conventional experiments.

[0078] like Figure 1 As shown in the figure, an embodiment of the present invention provides an automatic loading device for radioactive particles, including a base 700, a housing mechanism 900, and a particle sorting mechanism 100, a magazine mounting mechanism 400, a particle transport mechanism 200, a particle pushing mechanism 300, a magazine control mechanism 500, a particle blocking mechanism 600, and a control unit 800 mounted on the base 700. The particle sorting mechanism 100, the particle transport mechanism 200, the particle pushing mechanism 300, and the magazine control mechanism 500 are respectively signal-connected to the control unit 800 to realize the automatic loading of radioactive particles 10.

[0079] like Figure 2 As shown, the outer casing mechanism 900 includes an outer casing 901, a touch screen 902 mounted on the outer casing 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 mounting hatch 907, a magazine hatch switch detection component, and a magazine manual release hatch 908. The touch screen 902, emergency stop button 903, start button 904, fault confirmation button 905, particle replenishment hatch switch detection component, and magazine hatch switch detection component are all signal-connected to the control unit 700. This is prior art and will not be described in detail here.

[0080] Emergency stop button 903, start button 904, and fault confirmation button 905 are located on the front of housing 901, to the right of touchscreen 902. Emergency stop button 903, located at the top, is used to temporarily stop the device in an emergency. Start button 904 and fault confirmation button 905 control the device's start-up and pause, and fault confirmation and clearance, respectively. The power port is located on the lower right front side of housing 901 and is a power interface with a switch. It connects to an external power supply via a power cord to power the device. The particle replenishment chamber door 906 is a sliding door that moves horizontally left and right, with a circular handle for easy operation. Located on top of housing 901, the particle replenishment chamber door 906 has two positions: open and closed. When the particle replenishment chamber door 906 is open, personnel can add particles to the device; when the particle replenishment chamber door 906 is closed, particles cannot be added to the device, and foreign objects are prevented from entering. The particle replenishment hatch door switch detection sensor is mounted on the outer casing 901, directly below the closed position of the particle replenishment hatch door 906, and is used to detect the open / closed state of the particle replenishment hatch door 906. The magazine mounting hatch door switch detection sensor is mounted on the front of the outer casing 901, located in the closed position of the magazine mounting hatch door 907, and is used to detect the open / closed state of the magazine mounting hatch door 907.

[0081] Particle sorting mechanism 100 is used to sort radioactive particles 10, such as... Figure 3 As shown, it includes a vibration assembly, a vibratory disk 101 mounted on the vibration assembly, a shielding cover covering the vibratory disk 101, and a particle replenishment channel 103 mounted on the shielding cover. Radioactive particles 10 are filled into the vibratory disk 101 through the particle replenishment channel 103, and the vibration assembly drives the vibratory disk 101 to vibrate to sort the radioactive particles 10.

[0082] like Figures 4 to 6As shown, the vibratory feeder 101 includes a receiving chamber 101a, a sorting channel 101c arranged around the circumference of the receiving chamber 101a, and a discharge port 101d arranged outside the receiving chamber 101a. The sorting channel 101c rises in a spiral shape and connects to the discharge port 101d. The discharge port 101d is arranged in a horizontal direction and configured to allow a radioactive particle 10 to pass through. Specifically, the receiving chamber 101a is provided with a spirally rising protrusion 101b around its circumference. The protrusion 101b and the outer wall of the vibratory feeder 101 form the sorting channel 101c. The entrance of the sorting channel 101c is connected to the bottom of the receiving chamber 101a. The radioactive particle 10 in the receiving chamber 101a can smoothly enter the sorting channel 101c and move forward to the discharge port 101d of the sorting channel 101c. At the end of the sorting channel 101c is the discharge structure. When there are stacked or sticky radioactive particles 10 at the discharge port, because the side wall of the vibrating plate 101 is higher than the position in front of the end of the sorting channel 101c, the stacked or sticky radioactive particles 10 behind the sorting channel 101c will cross the protrusion 101b and return to the receiving chamber 101a for re-sorting.

[0083] The vibration assembly includes a vibration adjustment module and a vibration source 106 mounted 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 signal-connected to the control unit 700. The X-axis slide 107, Y-axis slide 108, and Z-axis slide 109 can adjust the position of the vibrating plate 101 in three directions: front-back, left-right, and up-down. The X-axis slide 107, Y-axis slide 108, and Z-axis slide 109 are existing technologies and will not be described in detail here. The vibration source 106 can be a circular vibrating screen or a linear vibrating screen. A circular vibrating screen is a power source that generates rotational force by driving an eccentric block with a motor. A linear vibrating screen is a power source that generates a resultant force in a straight line by having two symmetrically installed vibrating 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 on the outer periphery of the shielding housing 102. The shielding support plate 104 is supported on the base 700 by a plurality of shielding support columns 105 arranged on the outer periphery of the vibratory feeder 101. The shielding housing 102 covers the outer periphery of the vibratory feeder 101. The upper ends of the shielding support plate 104 and the shielding support columns 105 are fastened with nuts, and 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 vibratory feeder 101 to reduce radiation leakage.

[0085] like Figure 7As shown, the particle replenishment channel 103 has a spiral horn structure. The upper end of the particle replenishment channel 103 is the particle inlet 103a, and the lower end is equipped with a baffle 103c. 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 receiving chamber 101a. The baffle structure at the bottom of the particle replenishment channel 103 slows down the falling particles and prevents the particles from hitting the surface of the vibrating plate 101 too fast and having too much kinetic energy, causing them to fly out of the vibrating plate 101. A fixing plate 103d is provided in the middle of the particle replenishment channel 103, and the fixing plate 103d is fixed to the shielding cover 102 with 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 feeding channel 401b position of the magazine mounting structure 400, such as... Figure 8 As shown, it includes a transport support assembly, a particle transport block 206 slidably disposed on the transport support assembly, 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 receiving position of the discharge 101d of the particle sorting mechanism 100 or to the pushing position.

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

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

[0089] The transport drive unit includes a first lead screw motor 203 mounted on two first support plates 201 and a transport adapter block 204 connected to a nut of the first lead screw motor 203. A particle transport block 206 is connected to the transport adapter block 204 via a transport connector 205. The transport connector 205 is fixed to a first slider 209 and connected to the transport adapter block 204 below the first connecting plate 202 via 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 spaced apart on the first connecting plate 202 along the first direction of the base 700. The middle transport detection component 210 is used to initialize the position of the particle transport block 206 to zero, and the two front and rear transport detection components 210 are used to perform forward and backward electrical soft limits on the movement of the particle transport block 206.

[0090] The particle feeding 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 pusher support assembly, a particle pusher assembly slidably disposed on the pusher support assembly, and a pusher drive unit for driving the particle pusher assembly to move. The particle pusher assembly moves along the second direction of the base 700 under the drive of the pusher drive unit, so as to push the particles in the particle transport block 206 into the magazine through the particle pusher assembly. The second direction is perpendicular to the first direction.

[0091] The feeding 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 part 305, a particle pusher 306 mounted on the pusher mounting part 305 and extending horizontally along the second direction, and a feeding detection component 307 for detecting whether the feeding channel is unobstructed. The feeding detection component 307 can be a resistance strain gauge force sensor, a piezoelectric force sensor, a capacitive force sensor, an inductive force sensor, or a fiber optic force sensor. Considering accuracy, stability, and cost factors, this solution preferably uses a resistance strain gauge sensor as the feeding detection component 307. It is mainly used to determine whether the force transmitted from the front radioactive particle 10 to the particle pusher 306 is squeezed in the feeding channel, causing the force value to exceed the set value, resulting in deformation of the radioactive particle 10, thereby ensuring that the radioactive particle 10 loaded into the magazine is intact. The feeding detection component 307 is mounted on the pusher mounting part 305 and its other end is connected to the particle pusher 306. The particle pusher 306 is a slender needle with a stepped end, which is installed on the feeding detection component 307 and transmits the pushing force on the particle to the feeding detection component 307 in real time during the feeding process.

[0092] The feeding drive unit includes a second lead screw motor 303 and a feeding adapter block 304 connected to a nut of the second lead screw motor 303. A pusher pin mounting component 305 is fixedly connected to the feeding adapter block 304. The feeding adapter block 304 is slidably connected to a 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 slidably engaged with the second guide rail 308. The feeding adapter block 304 is fixedly connected to the second slider 309. Three feeding position detection components 310 are arranged at intervals along a second direction on the second connecting plate 302. The middle feeding position detection component 310 initializes the position of the particle pusher pin 306 to zero. The two front and rear feeding position detection components 310 provide forward and backward electrical soft limits for the movement of the particle pusher pin 306.

[0093] The magazine mounting structure 400 is used to mount a magazine for loading radioactive particles sorted by the particle sorting mechanism 100, such as... Figures 11 to 13 As shown, the device includes a magazine mounting plate 401, a spring fixing shaft mounted within the magazine mounting plate 401 and moving horizontally, a fixing shaft adapter assembly fixedly connected to the spring fixing shaft and extending outside the magazine mounting plate 401, and a cam adapter assembly mounted on the magazine mounting plate 401. In its initial state, the spring fixing shaft tends to move closer to the magazine position, and the cam adapter assembly, in the magazine control mechanism 500, moves the spring fixing shaft away from the magazine position. The magazine mounting plate 401 is fixed to one end of the first connecting plate 202.

[0094] like Figure 14 As shown, the spring fixing shaft includes a magazine fixing shaft 402 and a fixing shaft spring 403 sleeved on the magazine fixing shaft 402 to move the magazine fixing shaft 402 toward the magazine position. The magazine 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 near the magazine position, and a third shaft portion 402c located at one end of the first shaft portion 402a away from the magazine 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 fixing shaft spring 403 is sleeved on the third shaft portion 402c. An end plate 416 is provided on the outer side of the magazine mounting plate 401 to limit the magazine fixing shaft 402 within the magazine mounting plate 401. The fixing 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 magazine to position the magazine.

[0095] The fixed shaft adapter assembly includes a fixed shaft adapter block 404 fixedly connected to the first shaft portion 402a and a set of rolling elements 405 mounted on the fixed shaft adapter block 404 and disposed opposite to it. A movable groove is provided on the magazine mounting plate 401 for the fixed shaft adapter block 404 to extend out. The fixed shaft adapter block 404 can move within the movable groove along the extending direction of the spring fixed shaft 402 under the action of the cam adapter assembly. The set of rolling elements 405 includes two bearings disposed on both sides of the fixed shaft adapter block 404. A fixed shaft extending perpendicular to the extending direction of the spring fixed shaft 402 is provided on the fixed shaft adapter block 404, and the two bearings are supported on the fixed shaft.

[0096] The cam adapter assembly includes two first guide members 407 fixed on the magazine mounting plate 401, a cam adapter 406 slidably disposed on the first guide members 407, and a cam connecting shaft 408 fixedly connected to the cam adapter 406. The cam adapter 406 abuts against 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 to move upward, and the cam adapter 406 drives the fixed shaft adapter block 404 to move away from the magazine position, thereby driving the spring fixed shaft 402 away from the magazine position, facilitating the installation and removal of the magazine. 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 inclined upward from the spring fixed shaft 402 towards the magazine position. Through the cooperation of the inclined surface with the rolling elements 405, the rolling elements 405 are driven to move along the extension direction of the spring fixed shaft 402.

[0097] The magazine mounting plate 401 has a magazine mounting port with an opening at the lower end. A positioning plunger 409 extending into the magazine mounting port is located on the side of the magazine mounting plate 401. When the magazine is mounted on the magazine mounting plate 401 through the magazine mounting port, the positioning plunger 409 provides initial positioning of the magazine. When the spring fixing shaft 402 moves towards the magazine, it abuts against the magazine to fix it in place. To detect whether the magazine is properly installed, a magazine detection component 410 is provided inside the magazine mounting port. This magazine detection component 410 is signal-connected to the control unit 800.

[0098] like Figure 15As shown, the magazine includes a magazine sleeve 412, a particle chamber 411 mounted on the upper end of the magazine sleeve 412, a magazine shield 413 detachably mounted on the magazine sleeve 412 and covering the particle chamber 411, a particle ejector pin 414 passing through the magazine sleeve 412 and extending into the particle chamber 411, a magazine spring 415 disposed between the particle ejector pin 414 and the magazine sleeve 412, and a limiting member that restricts the particle ejector pin 414 within the magazine sleeve 412. The magazine sleeve 412 is a rod-shaped part with an internal through hole, and the magazine shield 413 is a rod-shaped part with an open lower end. The magazine shield 413 is threadedly connected to the magazine sleeve 412. The magazine shield 413 and the magazine sleeve 412 accommodate the internal structure and also have the function of reducing radiation leakage.

[0099] The particle chamber 411 contains a rectangular particle storage chamber 411a. A horizontally extending particle channel 411b extends through the upper part of the particle chamber 411, passing through the upper end of the particle storage chamber 411a. The size of the port of the particle channel 411b matches the size of the positioning protrusion 402d on the magazine fixing shaft 402, allowing the magazine fixing shaft 402 to extend into the particle channel 411 to position the magazine and prevent the radioactive particles 10 from being pushed out of the particle channel 411b. The magazine mounting plate 401 also has a particle feeding channel 401b corresponding to the particle channel 411b. To improve the stability of the magazine installation, a limiting screw is provided on the magazine mounting plate 401, and a limiting part that mates with the limiting screw is provided on the outer wall of the particle chamber 411. Figure 17 As shown, the particle ejector pin 414 approaches and blocks the particle channel 411b under the action of the magazine spring 415. When the magazine ejector pin 507 descends, it can drive the particle ejector pin 414 to descend, thereby clearing the particle channel 411b and facilitating the particle pusher pin 414 to push the radioactive particles 10 into the particle channel 411a to load the magazine. To facilitate the magazine ejector pin 507 to extend into the magazine sleeve 412, a ejector pin through hole is provided on the magazine sleeve 412 for the magazine ejector pin 507 to extend into.

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

[0101] The magazine control mechanism 500 is used to control the magazine to move out of the particle loading position so as to receive the radioactive particles 10 pushed by the particle feeding mechanism 300, such as... Figure 18 As shown, the system includes a magazine drive support assembly 501, a magazine drive unit mounted on the magazine drive support assembly 501, a ejector pin fixing plate 504 connected to the magazine drive unit, and a magazine ejector pin 507 mounted on the ejector pin fixing plate 504. The ejector pin fixing plate 504 has a groove 504a that mates with a cam connecting shaft 408. Preferably, the groove 504a is U-shaped. A limiting platform is provided at the upper end of the cam connecting shaft 408. The cam connecting shaft 408 moves upward through the engagement of the U-shaped groove 504a and the limiting platform. Three magazine ejector pin detection components 506 are arranged vertically at intervals on the first support plate 201. The middle magazine ejector pin detection component 506 initializes the position of the magazine ejector pin 507 to zero. The front and rear magazine ejector pin detection components 506 provide forward and backward electrical soft limits on the movement of the magazine ejector pin 507.

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

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

[0104] A particle blocking mechanism 600, mounted on a magazine mounting mechanism 400, is used to open or close the discharge port 101d of the particle sorting mechanism 100, such as... Figure 19 As shown, the device includes a guide shaft assembly mounted on a magazine mounting plate 401 and a deflector block 603 mounted 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 disposed between the guide shafts 601 and the magazine mounting plate 401. The guide spring 602 causes the deflector block 603 to 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 disposed inside the magazine mounting plate 401 and has an outer diameter larger than that of the second guide portion 601b. The second guide portion 601b passes through the magazine mounting plate 401 and extends to the outside of the magazine mounting plate 401, connecting with the deflector block 603. The guide spring 602 abuts against 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 vibrating plate 101. 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 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 block the particles from being discharged.

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

[0107] The working principle of this utility model is as follows:

[0108] The magazine is manually installed on the magazine mounting plate 401. The particle replenishment chamber door 906 on the outer casing mechanism 900 is opened. After passing through the particle replenishment channel 103, the particles enter the receiving chamber 101a of the vibratory feeder 101. After equipment initialization, the particle receiving hole 206a on the particle transport block 206 is coaxial with the discharge port 101d on the vibratory feeder 101 (e.g., ...). Figure 21 and Figure 22As shown, the vibration source 106 starts to vibrate, and the particles move upward in the sorting channel 101c of the vibrating 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 then screened by the discharge structure at the junction of the sorting channel 101c and the discharge port 101d, and the adsorbed and stacked particles are discharged back into the receiving chamber 101a of the vibrating disk 101. After entering the particle receiving hole 206a for a certain distance, the particles block the particle detection hole 206b and are then... After the particle positioning detection component 207 senses the particle, it transmits the signal to the control unit 800; the vibratory plate 101 stops vibrating, and the particle transport block 206 carries the particles away from the discharge port 101d on the vibratory plate 101. Under the action of the guide spring 602, the second end face 603c2 on the particle blocking block 603 adheres to the particle transport block 206, while the first end face 603c1 on the particle blocking block 603 gradually blocks the discharge port 101d on the vibratory plate 101 until the particle blocking block 603 reaches the bottom of its travel and stops moving.

[0109] The magazine control mechanism 500 starts working, and the magazine drive unit drives the magazine ejector pin 507 to move downward until the groove 504a of the ejector pin fixing plate 504 disengages from the cam connecting shaft 408. At this time, the cam adapter 406 loses its supporting force on the fixed shaft adapter block 404, and the magazine fixing shaft 402 moves toward the magazine position under the action of the fixed shaft spring 403 to fix the magazine. The magazine ejector pin 507 continues to descend, pushing the particle ejector pin 414 downward until the top particle part 414b is lower than the particle channel 411b to reserve space for particles to enter the magazine.

[0110] The particle feeding mechanism 300's feeding drive unit begins to work, such as... Figure 23 and Figure 24 As shown, the particle pusher 306 enters the particle receiving hole 206a and pushes the particles into the particle feeding channel 401b on the magazine mounting plate 401, and then into the particle channel 411b inside the particle chamber 411 of the magazine. During this process, the feeding detection component 307 detects the pressure of the radioactive particles 10 on the feeding detection component 307 to determine whether the radioactive particles 10 are squeezed in the feeding channel, causing the force value to exceed the set value and resulting in deformation of the radioactive particles 10, thereby ensuring that the radioactive particles 10 remain intact. The magazine drive unit of the magazine control mechanism 500 works, driving the magazine ejector pin 507 to move down a certain distance again. The particles that have entered the particle channel 411b descend with the particle ejector pin 414 and enter the particle storage chamber 411a.

[0111] The particle feeding mechanism 300's feeding drive unit operates, and the second lead screw motor 303 reverses to drive the particle pusher 306 out of the particle channel 411b, the particle feeding channel 401b on the magazine fixing plate 401, and the particle receiving hole 206a on the particle transport block 206, until it returns to the feeding position. Then, the transport drive unit operates, and the first lead screw motor 203 drives the particle transport block 206 from the feeding position to the receiving position, so that the particle receiving hole 206a of the particle transport block 206 aligns with the discharge port 101d on the particle sorting mechanism 100 to receive the next radioactive particle 10. This process is repeated until the magazine is loaded.

[0112] When the replenished radioactive particles 10 are greater than the magazine's capacity, the magazine is removed, and a particle recovery box is installed at the magazine's mounting position. Through the steps described above, the remaining particles are transported to the particle recovery box.

[0113] In summary, this loading device can achieve automatic loading of radioactive particles, improving loading efficiency and safety.

[0114] The above examples are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An automatic loading device for radioactive particles, characterized in that, include: A particle sorting mechanism used to sort radioactive particles; A magazine mounting mechanism for mounting a magazine to load radioactive particles sorted by the particle sorting mechanism; A particle transport mechanism is used to receive the radioactive particles sorted by the particle sorting mechanism and transport the radioactive particles to the loading position of the magazine mounting mechanism. A particle pushing mechanism is used to push the radioactive particles transported by the particle transport mechanism into the magazine. A magazine control mechanism is used to control the magazine to make it move out of the particle loading position so as to receive the radioactive particles pushed by the particle feeding mechanism. A particle blocking mechanism is installed on the magazine 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, particle transport mechanism, particle pusher mechanism, and magazine control mechanism via signals.

2. The apparatus for automatic loading of radioactive seeds according to claim 1, characterized in that: The particle sorting mechanism includes a vibration assembly, a vibrating disk mounted on the vibration assembly, a shielding cover covering the vibrating disk, and a particle replenishment channel mounted on the shielding cover. The vibratory feeder includes a receiving chamber, a sorting channel arranged around the circumference of the receiving chamber, and a discharge port arranged outside the receiving chamber. The sorting channel rises in a spiral shape and connects to the discharge port. The discharge port is arranged horizontally and configured to allow a radioactive particle to pass through.

3. The apparatus for automatic loading of radioactive seeds according to claim 2, characterized in that: The particle replenishment channel has a spiral horn structure, with a particle inlet at the upper end and a baffle at the lower end, and a particle outlet on the lower side of the particle replenishment channel.

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

5. The apparatus for automatic loading of radioactive seeds according to claim 1, characterized in that: The particle feeding mechanism includes a feeding support assembly, a particle pusher assembly slidably disposed on the feeding support assembly, and a feeding drive unit that drives the particle pusher assembly to move. The particle pusher assembly includes a pusher mounting component, a particle pusher mounted on the pusher mounting component and extending in a horizontal direction, and a pusher detection component for detecting whether the pusher channel is unobstructed. The pusher drive unit includes a second lead screw motor and a pusher adapter block connected to a nut of the second lead screw motor. The pusher pin mounting component is fixedly connected to the pusher adapter block, and the pusher adapter block is slidably connected to the pusher support component via a second guide rail assembly.

6. The apparatus for automatic loading of radioactive seeds according to claim 4, characterized in that: The magazine mounting mechanism includes a magazine mounting plate, a spring fixing shaft mounted inside the magazine mounting plate and moving horizontally, a fixing shaft adapter assembly fixedly connected to the spring fixing shaft and extending outside the magazine mounting plate, and a cam adapter assembly mounted on the magazine mounting plate. The spring fixing shaft tends to move closer to the magazine position in the initial state, and the cam adapter assembly, driven by the magazine control mechanism, moves the spring fixing shaft away from the magazine position.

7. The apparatus for automatic loading of radioactive seeds according to claim 6, characterized in that: The fixed shaft adapter assembly includes a fixed shaft adapter block and a set 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 disposed on the first guide members, and a cam connecting shaft fixedly connected to the cam adapter. The cam adapter abuts against the set of rolling elements, and the cam connecting shaft cooperates with the magazine control mechanism.

8. The apparatus for automatic loading of radioactive seeds 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, a ejector pin fixing plate that is drively connected to the magazine drive unit, and a magazine ejector pin mounted on the ejector pin fixing plate. The ejector pin fixing plate is provided with a groove that cooperates with the cam adapter shaft. The magazine drive unit includes a third lead screw motor and a magazine power adapter connected to a nut of the third lead screw motor. The ejector pin fixing plate is fixedly connected to the magazine power adapter via a connector.

9. The apparatus for automatic loading of radioactive seeds according to claim 8, characterized in that: The magazine includes a magazine sleeve, a particle chamber mounted on the upper end of the magazine sleeve, a magazine shield detachably mounted on the magazine sleeve and covering the particle chamber, a particle ejector pin passing through the magazine sleeve and extending into the particle chamber, a magazine spring disposed between the particle ejector pin and the magazine sleeve, and a limiting member that restricts the particle ejector pin in the magazine sleeve. The particle chamber contains a particle storage chamber and has a particle channel extending horizontally at the top. The particle ejector pin approaches the particle channel and blocks the particle channel under the action of the clip spring. The magazine sleeve is provided with a pin through hole for the magazine pin to extend into. When the pin fixing plate descends, it drives the magazine pin to cause the particle pin to descend and make way for the particle channel.

10. The apparatus for automatic loading of radioactive seeds according to claim 9, characterized in that: The particle ejector pin includes an ejector pin body, an ejector particle part disposed at the upper end of the ejector pin body, a limiting step disposed on the ejector pin body and protruding outward, and a limiting groove disposed at the lower end of the ejector pin body. The clip spring abuts against the limiting step and the clip sleeve. After the clip ejector pin descends, it abuts against the limiting step. The limiting member is a retaining spring and is locked in the limiting groove.

11. The apparatus for automatic loading of radioactive seeds according to claim 6, characterized in that: The particle blocking mechanism includes a guide shaft assembly mounted on the magazine mounting plate and a particle blocking block mounted 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 disposed between the guide shaft and the magazine mounting plate. The guide spring causes the particle blocking block to abut against the discharge port to block the discharge port.

12. The apparatus for automatic loading of radioactive seeds 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 is slidably disposed inside the magazine mounting plate and has an outer diameter larger than the second guide portion. The second guide portion passes through the magazine mounting plate and extends to the outside of the magazine mounting plate to connect with the deflector block. The guide spring abuts against the magazine mounting plate and the first guide portion. The particle blocking block includes a body, a connecting part, and a blocking part. The connecting part is connected to the body in an L-shape and 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 away from the connecting part cooperates with the discharge port. The second end face of the blocking part facing the magazine mounting plate cooperates with the particle transport block. The magazine mounting plate is provided with an avoidance groove for the particle transport block to be inserted.

Images