X-ray tube assembly for noble metal detection

Abstract

The application relates to the technical field of metal detectors, in particular to an X-ray tube assembly device for noble metal detection, which comprises a tube shell, an anode connecting pipe is arranged on one side of the outer wall of the tube shell, a negative electrode connecting pipe is arranged on the other side of the outer wall of the tube shell, and a vacuum glass cover is fixedly installed in the inner cavity of the tube shell. After the target disc is aged, the target disc can be replaced without damaging the vacuum glass cover, the service life of the X-ray tube is significantly prolonged, the holder always adheres to the surface of the target disc during the rotation of the target disc, plays a supporting and limiting role, makes the target disc unable to overturn, improves the stability of the target disc during rotation, avoids the risks of axial movement and radial deviation of the target disc, avoids the problem that unstable rotation of the target disc causes the position of the electron beam to deviate, and influences the detection precision of the metal detector, the holder is innovatively matched with the fork frame mounting structure, hollow rotating shafts and heat pipe structures penetrating through the hollow rotating shafts are simultaneously utilized, and further cooling and heat dissipation of the target disc are realized.

Description

Technical Field

[0001] This invention relates to the field of metal detector technology, and more specifically to an X-ray tube assembly device for detecting precious metals. Background Technology

[0002] The precious metal purity analyzer is a device used for the non-destructive and rapid detection of the composition and purity of precious metals such as gold, silver, platinum, and palladium. It uses X-ray fluorescence spectroscopy or the Archimedes principle buoyancy method for detection. This device is widely used in jewelry, pawnshops, precious metal recycling, banks, and testing laboratories. The X-ray precious metal analyzer is a non-destructive testing device based on X-ray fluorescence spectroscopy. It emits high-energy primary X-rays through a built-in X-ray tube assembly to irradiate the sample to be tested, which excites the inner electrons of the precious metal atoms to leave their orbits and form vacancies. When the outer high-energy electrons jump to fill the vacancies, they release secondary fluorescent X-rays with element-specific energy characteristics. The device's detector collects the energy and intensity signals of these rays, and through built-in algorithms, it analyzes and compares them to accurately determine the type and content of each precious metal and impurity element in the sample. It has a wide range of applications and is highly accurate. The X-ray tube is one of its core internal components. Currently, X-ray tubes used in precious metal detectors employ a single target disk structure. During operation, the electron beam continuously bombards the surface area of ​​this single target disk. Especially in high-frequency equipment, this can easily lead to rapid physical corrosion, crack networks, and pitting on the target disk surface, significantly increasing surface roughness. This can result in arcing, failure to produce adequate dose and quality X-rays, and ultimately, target disk failure and scrapping, leading to high replacement costs. While some X-ray tubes use a rotatable target disk design, they lack effective positioning components, making them susceptible to axial movement and radial misalignment during high-speed rotation or frequent start-stop cycles. The unstable rotation of the target disk can cause the electron beam bombardment position to shift, resulting in unstable X-ray output dose and focus drift, which in turn affects the detection accuracy of the metal detector and makes it impossible to accurately identify small metal impurities. This defect is more prominent, especially in high-precision detection scenarios. In addition, during the operation of the X-ray tube, more than 99% of the energy is converted into heat energy, and less than 1% is converted into usable X-rays. A large amount of heat is concentrated in the target disk and anode area. The heat dissipation of the existing X-ray tube assembly mainly relies on the insulating oil between the tube shell and the glass cover for heat conduction and heat dissipation. The heat dissipation efficiency is low and it is impossible to quickly dissipate the heat generated by the target disk, causing the target disk to be in a high-temperature working state for a long time. High temperatures not only accelerate target sublimation, disrupting the high-vacuum environment inside the X-ray tube and triggering high-voltage arc discharge, but also cause accelerated filament damage due to ion erosion and decreased insulation performance of the tube shell, creating a vicious cycle and further shortening the lifespan of the X-ray tube assembly. Therefore, an X-ray tube assembly device for precious metal detection is proposed, which adopts a built-in double target disk structure. The target disk can be flipped and replaced when needed, significantly extending the lifespan of the X-ray tube. The stability of the target disk during rotation is comprehensively improved through the positioning component, and the heat dissipation effect of the target disk is improved through the built-in integrated heat dissipation component. Summary of the Invention

[0003] To address the problems in the prior art, this invention provides an X-ray tube assembly device for precious metal detection, which adopts a built-in dual target disk structure. The target disks can be flipped and replaced when needed, significantly extending the service life of the X-ray tube. The positioning component comprehensively improves the stability of the target disks during rotation, and the built-in integrated heat dissipation component enhances the heat dissipation effect on the target disks.

[0004] The technical solution adopted by the present invention to solve its technical problem is an X-ray tube assembly device for precious metal detection, including a tube shell, an anode connector provided on one side of the outer wall of the tube shell, a negative electrode connector provided on the other side of the outer wall, and a vacuum glass cover fixedly installed in the inner cavity of the tube shell. An extension tube is integrally formed at the end of the vacuum glass cover and arranged coaxially. A transmission rotor is installed inside the end of the extension tube near the connection of the vacuum glass cover. The extension tube is connected to a rotating shaft through the internal transmission rotor. The rotating shaft can rotate synchronously with the transmission rotor and its end extends into the internal cavity of the vacuum glass cover. A through groove is opened through the inside of the rotating shaft along its own central axis. A fork is fixedly installed at the end of the rotating shaft inside the vacuum glass cover. A bearing is embedded in the end of the fork and a connecting ring is movably connected to the bearing. Target plate A and target plate B are fixedly installed on both sides of the outer ring surface of the connecting ring, respectively. A motor stator is coaxially fitted on the outer peripheral wall of the extension tube corresponding to the position of the internal transmission rotor.

[0005] By adopting the above technical solution, the main body of the vacuum glass cover is installed inside the tube shell, and all X-ray generating components are installed inside the vacuum glass cover. The target disk structure, serving as the core for receiving the beam, uses two target disks, A and B, as a rotating anode structure. These two disks are respectively installed on opposite sides of the connecting ring. The connecting ring is connected to the bearing at the end of the fork via a connecting assembly, allowing the connecting ring to be rotated to adjust the orientation of target disks A and B. Under normal operating conditions, one target disk faces the beam emission end. When powered on, the motor stator and drive rotor cooperate to cause the drive rotor to rotate inside the extension tube, which in turn drives the target disk to rotate via the shaft and fork. This allows the dual-target disk structure to rotate normally, dispersing heat from the rotating anode and reducing the heat load at a single point. After prolonged use, if the target disk facing the beam emission end develops erosion or pitting, the restriction on the target disk can be released by external components. Then, by flipping the vacuum glass cover, the angle of the connecting ring can be adjusted so that the unused target disk on the other side faces the beam emission end. After repositioning, it can be repositioned. Compared to the traditional method where the center of the target disk inside the X-ray tube is directly connected to the power end of the motor rotor assembly, the target disk can be replaced without damaging the vacuum glass cover after it ages, significantly extending the service life of the X-ray tube and reducing maintenance costs.

[0006] Specifically, a spring is fixedly connected to the end surface of the fork away from the connecting ring. The fork is elastically connected to a support via the spring. The support and the connecting ring correspond to each other and are in the same relative position. Target plates A and B have vertically protruding insertion holes at corresponding positions on both sides of their outer surfaces. Insert rods are vertically fixed at both ends of the support surface facing the connecting ring. The insert rods are inserted into the corresponding insertion holes in a one-to-one correspondence. A metal ring is bonded to the surface of the support near the spring. A magnetic ring is detachably and coaxially fitted on the outer peripheral wall of the extension tube.

[0007] By adopting the above technical solution, since the target disk is positioned using a fork assembly, a certain gap exists between the surface of the target disk and the end of the rotating shaft. A support structure is installed in this gap via a spring. Under the spring force, the support structure pushes towards one side of the target disk. Simultaneously, a plug is provided on the side of the support, which, after resetting to its proper position, can be inserted precisely into the plug hole inside the target disk, achieving a close fit between the support and the target disk. During the rotation of the target disk, the support structure remains in contact with the target disk surface, providing support and limiting its rotation, preventing it from tipping over and improving its stability during rotation. To prevent risks such as axial movement and radial offset of the target disk, and to avoid the problem of unstable rotation of the target disk causing deviation in the electron beam bombardment position, which would affect the detection accuracy of the metal detector, when it is necessary to release the limitation of the support on the target disk, the motor stator assembly on the outer periphery of the extension tube is temporarily removed. Then, the magnetic ring is put into the outer periphery of the extension tube and placed close to the side of the vacuum glass cover. The metal ring on the surface of the support is attracted by magnetism. A large magnetic ring is selected. The attraction of the metal ring moves the support towards the rotating shaft and compresses the spring, thereby releasing the limitation on the target disk and facilitating the adjustment of the target disk angle.

[0008] Specifically, a closed cold liquid chamber is provided at the end of the extension tube away from the vacuum glass cover. The internal space of the cold liquid chamber is used to fill and store coolant to improve the heat dissipation and cooling effect. A shaft seal is fixedly and sealed inside the extension tube at the end of the cold liquid chamber. The extension tube is rotated and limited by the shaft seal and is movably connected to a heat pipe. One end of the heat pipe extends into the cold liquid chamber to complete the heat exchange contact, and the other end of the heat pipe is tightly fitted to the surface of the support.

[0009] By adopting the above technical solution, the internal shaft structure of the transmission rotor is hollow, with a through groove inside. A heat pipe extending through the groove and into the cold liquid chamber is located on the surface of the support. The cold liquid chamber is pre-filled with coolant. When the X-ray tube is in operation, the support surface is in contact with the target disk. The support is made of a high thermal conductivity material, and the heat pipe is encapsulated with an easily evaporable working fluid. The working fluid absorbs heat and vaporizes at the heated end. Under the action of pressure difference, the vapor flows to the end of the heat pipe inside the cold liquid chamber, where it releases heat and liquefies. The liquid working fluid then flows back to the end near the target disk through the capillary structure of the heat pipe. The heated end on the side achieves high-speed and efficient long-distance heat transfer through continuous phase change of the working fluid, thereby cooling the target plate. Compared with the traditional single heat dissipation method of filling the outside of the glass cover with insulating oil, the innovative design adopts a fork-mounted structure with a support bracket. At the same time, it utilizes a hollow rotating shaft and a heat pipe structure that runs through it to further cool the target plate, reduce the operating temperature of the target plate, and extend the service life of the X-ray tube assembly. The shaft seal structure is located at the end of the cold liquid chamber, which allows the heat pipe to rotate with the support bracket while preventing coolant leakage inside the cold liquid chamber.

[0010] Specifically, a light-emitting base is fixed in the middle section of the tube shell by fasteners, and a light-emitting hole is opened on one side inside the light-emitting base. The opening position of the light-emitting hole corresponds to the installation position of the target plate.

[0011] By adopting the above technical solution, after the X-ray light is generated inside the vacuum glass cover, it is emitted outward through the light emission hole inside the light source.

[0012] Specifically, a shielding ring is attached to the side of the motor stator facing the vacuum glass cover, and insulating oil is filled in the cavity between the inside of the tube shell and the outer wall of the vacuum glass cover.

[0013] By adopting the above technical solution, the shielding ring installed at the end of the motor stator facing the vacuum glass cover can play a shielding and isolation role, and the insulating oil filled inside the tube shell and outside the vacuum glass cover can play a role in insulation, heat conduction and heat dissipation.

[0014] Specifically, the fork has symmetrically arranged limit holes at both ends facing the extension tube inside, and a limit rod that passes through the metal ring and the limit hole is fixed on one side of the support surface.

[0015] By adopting the above technical solution, a limiting hole structure is opened inside the fork, and a limiting rod structure that passes through the limiting hole is fixed on the surface of the support. By utilizing the cooperation between the limiting hole and the limiting rod, the spring can only generate a unidirectional force, supporting and stabilizing the position of the support and ensuring that the support will not deviate during rotation.

[0016] Specifically, a power supply pipe is installed inside the vacuum glass cover at the end away from the extension tube. The end of the power supply pipe inside the vacuum glass cover is fixed with a mounting base for a built-in filament assembly. The light-emitting end of the mounting base corresponds to the installation position of the target plate.

[0017] By adopting the above technical solution, the power supply pipe is connected to an external power supply component, which supplies power to the filament assembly inside the mounting base during operation, causing it to generate an electron beam that bombards the target disk to produce X-rays.

[0018] Specifically, a heat dissipation ring is installed on the outer periphery of the extension tube in the corresponding section of the cold liquid cavity.

[0019] By adopting the above technical solution, a heat dissipation ring is attached to the outer circumference of the extension tube. The heat dissipation ring is immersed in the insulating oil inside the tube shell. The heat dissipation ring accelerates the dissipation of the temperature inside the coolant into the insulating oil, thereby maintaining the low temperature environment inside the cold liquid cavity.

[0020] The beneficial effects of this invention are: (1) The X-ray tube assembly device for precious metal detection described in this invention uses a double target plate A and a target plate B as a rotating anode structure. The connecting ring is connected to the bearing at the end of the fork via a connecting component, so that the connecting ring can be flipped to adjust the orientation of the target plate A and the target plate B. One side of the target plate faces the beam emission end. After long-term use, the target plate facing the beam emission end will experience erosion, pitting, etc. The limiting of the target plate can be released by an external component. Then, the angle of the connecting ring can be adjusted by flipping the vacuum glass cover so that the other side of the unused target plate faces the beam emission end. Then, it can be repositioned. Compared with the traditional method of directly connecting the center position of the target plate inside the X-ray tube to the power end of the motor rotor assembly, the target plate can be replaced without damaging the vacuum glass cover after the target plate ages, which significantly extends the service life of the X-ray tube and reduces maintenance costs.

[0021] (2) The X-ray tube assembly device for precious metal detection described in this invention has a support structure that pushes towards the target disk under the action of spring force. During the rotation of the target disk, the support structure always fits against the surface of the target disk, playing a supporting and limiting role, preventing it from flipping over, and improving its stability during rotation. This avoids the risk of axial movement and radial displacement of the target disk, and avoids the problem of unstable rotation of the target disk causing the electron beam bombardment position to shift, affecting the detection accuracy of the metal detector. When it is necessary to release the support from the target disk, the magnetic ring is put into the outer circumference of the extension tube and close to the side of the vacuum glass cover. The metal ring on the surface of the support is attracted by magnetism. A large magnetic ring is selected. The attraction of the metal ring drives the support to move towards the rotating shaft and compresses the spring, thereby releasing the limitation on the target disk and facilitating the adjustment of the target disk angle.

[0022] (3) The X-ray tube assembly device for precious metal detection described in this invention has a support surface that is attached to the target plate. The support is made of a material with high thermal conductivity. The heat pipe is encapsulated with an easily evaporable working fluid. Through the continuous circulation and phase change of the working fluid, heat is transferred over long distances at high speed and efficiency, thereby achieving cooling and heat dissipation of the target plate. The innovative use of a fork mounting structure to fit the support, along with the use of a hollow rotating shaft and a heat pipe structure that runs through it, further cools and dissipates heat from the target plate, reduces the working temperature of the target plate, and extends the service life of the X-ray tube assembly. Attached Figure Description

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Figure 1 This is a schematic diagram of the external structure of the casing of the present invention; Figure 2 This is a schematic diagram of the internal vacuum glass cover structure of the tube shell of the present invention; Figure 3 This is a schematic diagram of the support, target plate, and spring structure of the present invention; Figure 4 This is a schematic diagram of the fork structure of the present invention; Figure 5 This is a schematic diagram of the internal structure of the extension tube of the present invention; Figure 6 This is a schematic diagram of the magnetic ring mounting control bracket in the released limiting state. Figure 7 This is a schematic diagram of the support and metal ring structure of the present invention; In the diagram: 1. Tube shell; 101. Anode connector; 102. Negative connector; 103. Light-emitting base; 103. Light-emitting hole; 2. Vacuum glass cover; 201. Extension tube; 202. Transmission rotor; 203. Shaft; 204. Through slot; 205. Fork; 206. Bearing; 207. Connecting ring; 208. Target plate A; 209. Target plate B; 210. Motor stator; 211. Shielding ring; 3. Spring; 301. Support; 302. Insertion hole; 303. Insertion rod; 304. Metal ring; 305. Limiting rod; 306. Limiting hole; 307. Magnetic ring; 4. Power supply pipe; 401. Mounting base; 5. Cooling liquid chamber; 501. Shaft seal; 502. Heat pipe; 503. Heat dissipation ring. Detailed Implementation

[0025] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0026] Example 1: The technical solution adopted by the present invention to solve its technical problem is an X-ray tube assembly device for precious metal detection, including a tube shell 1, an anode connector 101 is provided on one side of the outer wall of the tube shell 1, a negative electrode connector 102 is provided on the other side of the outer wall, and a vacuum glass cover 2 is fixedly installed in the inner cavity of the tube shell 1. An extension tube 201 is integrally formed at the end of the vacuum glass cover 2 and arranged coaxially. A transmission rotor 202 is installed inside the end of the extension tube 201 near the connection of the vacuum glass cover 2. The extension tube 201 is connected to a rotating shaft 203 through the internal transmission rotor 202. The rotating shaft 203 can rotate synchronously with the transmission rotor 202 and its end extends into the internal cavity of the vacuum glass cover 2. A through groove 204 is opened through the interior of the rotating shaft 203 along its own central axis. A fork 205 is fixedly installed at the end of the rotating shaft 203 inside the vacuum glass cover 2. A bearing 206 is embedded in the end of the fork 205 and a connecting ring 207 is movably connected to the bearing 206. Target disks A and B are fixedly installed on both sides of the outer ring surface of the connecting ring 207, respectively. A motor stator 210 is coaxially fitted on the outer peripheral wall of the extension tube 201 in the area corresponding to the position of the internal transmission rotor 202.

[0027] In use, the main body of the vacuum glass cover 2 is installed inside the tube shell 1, and all X-ray generating components are installed inside the vacuum glass cover 2. The target disk structure, serving as the core for receiving the beam, uses a dual-target disk structure with target disks A208 and B209 as the rotating anode. These are respectively installed on opposite sides of the surface of the connecting ring 207. The connecting ring 207 is connected to the bearing 206 at the end of the fork 205 via a connecting assembly, allowing the connecting ring 207 to be rotated to adjust the orientation of target disks A208 and B209. Under normal operating conditions, one target disk faces the beam emission end. When powered on, the motor stator 210 cooperates with the transmission rotor 202, causing the transmission rotor 202 to rotate inside the extension tube 201, thereby generating X-rays through the rotation... The shaft 203 and fork 205 drive the rotation of the target disk, allowing the dual target disk structure to rotate normally. The rotating anode heat is dispersed, resulting in low single-point heat load. After prolonged use, if the target disk facing the beam emission end develops erosion, pitting, or other phenomena, the restriction on the target disk can be released by external components. Then, the angle of the connecting ring 207 can be adjusted by flipping the vacuum glass cover 2, so that the unused target disk on the other side faces the beam emission end. After repositioning, it can be repositioned. Compared with the traditional method of directly connecting the center position of the target disk inside the X-ray tube to the power end of the motor rotor assembly, the target disk can be replaced without damaging the vacuum glass cover 2 after the target disk ages, significantly extending the service life of the X-ray tube and reducing maintenance costs.

[0028] Specifically, a light-emitting base 103 is fixed in the middle section of the tube shell 1 by fasteners. A light-emitting hole 103 is opened on one side inside the light-emitting base 103, and the opening position of the light-emitting hole 103 corresponds to the target plate installation position.

[0029] When in use, after the X-ray light is generated inside the vacuum glass cover 2, it is emitted outward through the light emission hole 103 inside the light emission seat 103.

[0030] Specifically, a shielding ring 211 is attached to the end of the motor stator 210 facing the vacuum glass cover 2, and insulating oil is filled in the cavity between the inside of the tube shell 1 and the outer wall of the vacuum glass cover 2.

[0031] During use, the shielding ring 211 installed on the side of the motor stator 210 facing the vacuum glass cover 2 can play a shielding and isolation role. The insulating oil filled inside the tube shell 1 and outside the vacuum glass cover 2 plays a role in insulation, heat conduction and heat dissipation.

[0032] Specifically, a power supply pipe 4 is installed inside the vacuum glass cover 2 at the end away from the extension tube 201. The end of the power supply pipe 4 located inside the vacuum glass cover 2 is fixed with a mounting base 401 with a built-in filament assembly. The light-emitting end of the mounting base 401 corresponds to the installation position of the target plate.

[0033] When in use, the power supply tube 4 is connected to an external power supply component, which supplies power to the filament assembly inside the mounting base 401 during operation, causing it to generate an electron beam that bombards the target disk to produce X-rays.

[0034] In use, the main body of the vacuum glass cover 2 is installed inside the tube shell 1, and all X-ray generating components are installed inside the vacuum glass cover 2. The target disk structure, serving as the core for receiving the beam, uses a dual-target disk structure with target disks A208 and B209 as the rotating anode. These two disks are respectively installed on opposite sides of the surface of the connecting ring 207. The connecting ring 207 is connected to the bearing 206 at the end of the fork 205 via a connecting assembly, allowing the connecting ring 207 to be rotated to adjust the orientation of target disks A208 and B209. Under normal operating conditions, one target disk faces the beam emission end. When powered on, the motor stator 210 cooperates with the transmission rotor 202 to cause the transmission rotor 202 to rotate inside the extension tube 201, thereby generating X-rays through the rotation... The shaft 203 and fork 205 drive the rotation of the target disk, allowing the dual target disk structure to rotate normally. The rotating anode heat is dispersed, resulting in low single-point heat load. After prolonged use, if the target disk facing the beam emission end develops erosion, pitting, or other phenomena, the restriction on the target disk can be released by external components. Then, the angle of the connecting ring 207 can be adjusted by flipping the vacuum glass cover 2, so that the unused target disk on the other side faces the beam emission end. After repositioning, it can be repositioned. Compared with the traditional method of directly connecting the center position of the target disk inside the X-ray tube to the power end of the motor rotor assembly, the target disk can be replaced without damaging the vacuum glass cover 2 after the target disk ages, significantly extending the service life of the X-ray tube and reducing maintenance costs.

[0035] Example 2: The technical solution adopted by the present invention to solve its technical problem is an X-ray tube assembly device for precious metal detection, including a tube shell 1, an anode connector 101 is provided on one side of the outer wall of the tube shell 1, a negative electrode connector 102 is provided on the other side of the outer wall, and a vacuum glass cover 2 is fixedly installed in the inner cavity of the tube shell 1. An extension tube 201 is integrally formed at the end of the vacuum glass cover 2 and arranged coaxially. A transmission rotor 202 is installed inside the end of the extension tube 201 near the connection of the vacuum glass cover 2. The extension tube 201 is connected to a rotating shaft 203 through the internal transmission rotor 202. The rotating shaft 203 can rotate synchronously with the transmission rotor 202 and its end extends into the internal cavity of the vacuum glass cover 2. A through groove 204 is opened through the interior of the rotating shaft 203 along its own central axis. A fork 205 is fixedly installed at the end of the rotating shaft 203 inside the vacuum glass cover 2. A bearing 206 is embedded in the end of the fork 205 and a connecting ring 207 is movably connected to the bearing 206. Target disks A and B are fixedly installed on both sides of the outer ring surface of the connecting ring 207, respectively. A motor stator 210 is coaxially fitted on the outer peripheral wall of the extension tube 201 in the area corresponding to the position of the internal transmission rotor 202.

[0036] In use, the main body of the vacuum glass cover 2 is installed inside the tube shell 1, and all X-ray generating components are installed inside the vacuum glass cover 2. The target disk structure, serving as the core for receiving the beam, uses a dual-target disk structure with target disks A208 and B209 as the rotating anode. These are respectively installed on opposite sides of the surface of the connecting ring 207. The connecting ring 207 is connected to the bearing 206 at the end of the fork 205 via a connecting assembly, allowing the connecting ring 207 to be rotated to adjust the orientation of target disks A208 and B209. Under normal operating conditions, one target disk faces the beam emission end. When powered on, the motor stator 210 cooperates with the transmission rotor 202, causing the transmission rotor 202 to rotate inside the extension tube 201, thereby generating X-rays through the rotation... The shaft 203 and fork 205 drive the rotation of the target disk, allowing the dual target disk structure to rotate normally. The rotating anode heat is dispersed, resulting in low single-point heat load. After prolonged use, if the target disk facing the beam emission end develops erosion, pitting, or other phenomena, the restriction on the target disk can be released by external components. Then, the angle of the connecting ring 207 can be adjusted by flipping the vacuum glass cover 2, so that the unused target disk on the other side faces the beam emission end. After repositioning, it can be repositioned. Compared with the traditional method of directly connecting the center position of the target disk inside the X-ray tube to the power end of the motor rotor assembly, the target disk can be replaced without damaging the vacuum glass cover 2 after the target disk ages, significantly extending the service life of the X-ray tube and reducing maintenance costs.

[0037] Specifically, a spring 3 is fixedly connected to the end surface of the fork 205 away from the connecting ring 207. The fork 205 is elastically connected to a support 301 through the spring 3. The support 301 corresponds to the connecting ring 207 and is in the same relative position. The outer surfaces of the target disk A208 and the target disk B209 are vertically provided with corresponding insertion holes 302. The two ends of the support 301 facing the connecting ring 207 are vertically fixed with insertion rods 303. The insertion rods 303 are inserted into the corresponding insertion holes 302 in a one-to-one correspondence. A metal ring 304 is glued and fixed to the surface of the support 301 near the spring 3. A magnetic ring 307 is detachably and coaxially fitted on the outer peripheral wall of the extension tube 201.

[0038] During use, because the target disk is positioned using the fork 205 assembly, there is a certain gap between the surface of the target disk and the end of the rotating shaft 203. A support 301 structure is installed in this gap via a spring 3. Under the elastic force of the spring 3, the support 301 structure pushes towards one side of the target disk. Simultaneously, a plug 303 is provided on the side of the support 301, which, after resetting to its original position, can be inserted precisely into the plug hole 302 inside the target disk, achieving a close fit between the support 301 and the target disk. During the rotation of the target disk, the support 301 structure remains in contact with the target disk surface, providing support and limiting its rotation, preventing it from flipping over, and improving its stability during rotation, thus avoiding target slippage. To mitigate risks such as axial movement and radial offset of the target disk and prevent unstable rotation of the target disk from causing deviation in the electron beam bombardment position and affecting the detection accuracy of the metal detector, when it is necessary to release the restriction of the support 301 on the target disk, the motor stator 210 assembly on the outer periphery of the extension tube 201 is temporarily removed. Then, the magnetic ring 307 is fitted onto the outer periphery of the extension tube 201 and placed near the vacuum glass cover 2. The metal ring 304 on the surface of the support 301 is magnetically attracted. A large magnetic ring 307 is selected. The attraction of the metal ring 304 drives the support 301 to move towards the rotating shaft 203 and compresses the spring 3, thereby releasing the restriction on the target disk and facilitating the adjustment of the target disk angle.

[0039] Specifically, the fork 205 has symmetrically arranged limit holes 306 at both ends facing the extension tube 201, and a limit rod 305 that passes through the metal ring 304 and the limit hole 306 is fixed on one side of the surface of the support 301.

[0040] When in use, the fork 205 has a limiting hole 306 inside, and the support 301 has a limiting rod 305 that passes through the limiting hole 306. By using the cooperation between the limiting hole 306 and the limiting rod 305, the spring 3 can only generate a unidirectional force, supporting and stabilizing the position of the support 301, and ensuring that the support 301 will not shift during rotation.

[0041] During use, because the target disk is positioned using the fork 205 assembly, there is a certain gap between the surface of the target disk and the end of the rotating shaft 203. A support 301 structure is installed in this gap via a spring 3. Under the elastic force of the spring 3, the support 301 structure pushes towards one side of the target disk. Simultaneously, a plug 303 is provided on the side of the support 301, which, after resetting to its original position, can be inserted precisely into the plug hole 302 inside the target disk, achieving a close fit between the support 301 and the target disk. During the rotation of the target disk, the support 301 structure remains in contact with the target disk surface, providing support and limiting its rotation, preventing it from flipping over, and improving its stability during rotation, thus avoiding target disk... To mitigate risks such as axial movement and radial offset, and to prevent unstable rotation of the target disk from causing electron beam bombardment position deviation and affecting the detection accuracy of the metal detector, when it is necessary to release the restriction of the support 301 on the target disk, the motor stator 210 assembly on the outer periphery of the extension tube 201 is temporarily removed. Then, the magnetic ring 307 is fitted onto the outer periphery of the extension tube 201 and placed near the vacuum glass cover 2. The metal ring 304 on the surface of the support 301 is magnetically attracted. A large magnetic ring 307 is selected. The attraction of the metal ring 304 drives the support 301 to move towards the rotating shaft 203 and compresses the spring 3, thereby releasing the restriction on the target disk and facilitating the adjustment of the target disk angle.

[0042] Example 3: The technical solution adopted by the present invention to solve its technical problem is an X-ray tube assembly device for precious metal detection, including a tube shell 1, an anode connector 101 is provided on one side of the outer wall of the tube shell 1, a negative electrode connector 102 is provided on the other side of the outer wall, and a vacuum glass cover 2 is fixedly installed in the inner cavity of the tube shell 1. An extension tube 201 is integrally formed at the end of the vacuum glass cover 2 and arranged coaxially. A transmission rotor 202 is installed inside the end of the extension tube 201 near the connection of the vacuum glass cover 2. The extension tube 201 is connected to a rotating shaft 203 through the internal transmission rotor 202. The rotating shaft 203 can rotate synchronously with the transmission rotor 202 and its end extends into the internal cavity of the vacuum glass cover 2. A through groove 204 is opened through the interior of the rotating shaft 203 along its own central axis. A fork 205 is fixedly installed at the end of the rotating shaft 203 inside the vacuum glass cover 2. A bearing 206 is embedded in the end of the fork 205 and a connecting ring 207 is movably connected to the bearing 206. Target disks A and B are fixedly installed on both sides of the outer ring surface of the connecting ring 207, respectively. A motor stator 210 is coaxially fitted on the outer peripheral wall of the extension tube 201 in the area corresponding to the position of the internal transmission rotor 202.

[0043] In use, the main body of the vacuum glass cover 2 is installed inside the tube shell 1, and all X-ray generating components are installed inside the vacuum glass cover 2. The target disk structure, serving as the core for receiving the beam, uses a dual-target disk structure with target disks A208 and B209 as the rotating anode. These are respectively installed on opposite sides of the surface of the connecting ring 207. The connecting ring 207 is connected to the bearing 206 at the end of the fork 205 via a connecting assembly, allowing the connecting ring 207 to be rotated to adjust the orientation of target disks A208 and B209. Under normal operating conditions, one target disk faces the beam emission end. When powered on, the motor stator 210 cooperates with the transmission rotor 202, causing the transmission rotor 202 to rotate inside the extension tube 201, thereby generating X-rays through the rotation... The shaft 203 and fork 205 drive the rotation of the target disk, allowing the dual target disk structure to rotate normally. The rotating anode heat is dispersed, resulting in low single-point heat load. After prolonged use, if the target disk facing the beam emission end develops erosion, pitting, or other phenomena, the restriction on the target disk can be released by external components. Then, the angle of the connecting ring 207 can be adjusted by flipping the vacuum glass cover 2, so that the unused target disk on the other side faces the beam emission end. After repositioning, it can be repositioned. Compared with the traditional method of directly connecting the center position of the target disk inside the X-ray tube to the power end of the motor rotor assembly, the target disk can be replaced without damaging the vacuum glass cover 2 after the target disk ages, significantly extending the service life of the X-ray tube and reducing maintenance costs.

[0044] Specifically, a spring 3 is fixedly connected to the end surface of the fork 205 away from the connecting ring 207. The fork 205 is elastically connected to a support 301 through the spring 3. The support 301 corresponds to the connecting ring 207 and is in the same relative position. The outer surfaces of the target disk A208 and the target disk B209 are vertically provided with corresponding insertion holes 302. The two ends of the support 301 facing the connecting ring 207 are vertically fixed with insertion rods 303. The insertion rods 303 are inserted into the corresponding insertion holes 302 in a one-to-one correspondence. A metal ring 304 is glued and fixed to the surface of the support 301 near the spring 3. A magnetic ring 307 is detachably and coaxially fitted on the outer peripheral wall of the extension tube 201.

[0045] During use, because the target disk is positioned using the fork 205 assembly, there is a certain gap between the surface of the target disk and the end of the rotating shaft 203. A support 301 structure is installed in this gap via a spring 3. Under the elastic force of the spring 3, the support 301 structure pushes towards one side of the target disk. Simultaneously, a plug 303 is provided on the side of the support 301, which, after resetting to its original position, can be inserted precisely into the plug hole 302 inside the target disk, achieving a close fit between the support 301 and the target disk. During the rotation of the target disk, the support 301 structure remains in contact with the target disk surface, providing support and limiting its rotation, preventing it from flipping over, and improving its stability during rotation, thus avoiding target slippage. To mitigate risks such as axial movement and radial offset of the target disk and prevent unstable rotation of the target disk from causing deviation in the electron beam bombardment position and affecting the detection accuracy of the metal detector, when it is necessary to release the restriction of the support 301 on the target disk, the motor stator 210 assembly on the outer periphery of the extension tube 201 is temporarily removed. Then, the magnetic ring 307 is fitted onto the outer periphery of the extension tube 201 and placed near the vacuum glass cover 2. The metal ring 304 on the surface of the support 301 is magnetically attracted. A large magnetic ring 307 is selected. The attraction of the metal ring 304 drives the support 301 to move towards the rotating shaft 203 and compresses the spring 3, thereby releasing the restriction on the target disk and facilitating the adjustment of the target disk angle.

[0046] Specifically, a closed cold liquid chamber 5 is provided at the end of the extension tube 201 away from the vacuum glass cover 2. The internal cavity of the cold liquid chamber 5 is used to fill and store coolant to improve the heat dissipation and cooling effect. A shaft seal 501 is fixedly and sealed inside the cavity of the extension tube 201 and at the inner side of the end of the cold liquid chamber 5. The extension tube 201 is rotated and limited by the shaft seal 501 and is movably connected to a heat pipe 502. One end of the heat pipe 502 extends into the cold liquid chamber 5 to complete the heat exchange contact, and the other end of the heat pipe 502 is tightly fitted to the surface of the support 301.

[0047] In use, the internal shaft 203 of the drive rotor 202 has a hollow structure with a through groove 204. A heat pipe 502 extends through the through groove 204 and into the cold liquid chamber 5, located on the surface of the support 301. The cold liquid chamber 5 is pre-filled with coolant. When the X-ray tube is in operation, the surface of the support 301 is in contact with the target plate. The support 301 is made of a high thermal conductivity material. The heat pipe 502 encapsulates an easily evaporable working fluid. The working fluid absorbs heat and vaporizes at the heated end. Under the action of pressure difference, the vapor flows to the end of the heat pipe 502 inside the cold liquid chamber 5. After reaching the end of the cold liquid chamber 5, it releases heat and liquefies. The liquid working fluid then flows back to the end of the heat pipe 502 through the capillary structure. The heated end near the target plate achieves high-speed and efficient long-distance heat transfer through continuous phase change of the working fluid, thereby cooling the target plate. Compared with the traditional single heat dissipation method of filling the outside of the glass cover with insulating oil, the innovative use of the fork bracket 205 mounting structure in conjunction with the bracket 301, along with the hollow rotating shaft 203 and the heat pipe 502 structure running through it, further cools the target plate, reduces the operating temperature of the target plate, and extends the service life of the X-ray tube assembly. The shaft seal 501 structure is located at the end of the cold liquid chamber 5, allowing the heat pipe 502 to rotate with the bracket 301 while preventing coolant leakage inside the cold liquid chamber 5.

[0048] Specifically, a heat dissipation ring 503 is installed on the outer periphery of the extension tube 201 in the corresponding section of the cold liquid cavity 5.

[0049] During use, a heat dissipation ring 503 is attached to the outer periphery of the extension tube 201. The heat dissipation ring 503 is immersed in the insulating oil inside the tube shell 1. The heat dissipation ring 503 accelerates the dissipation of the temperature inside the coolant into the insulating oil, thereby maintaining the low temperature environment inside the cold liquid chamber 5.

[0050] In use, the internal shaft 203 of the transmission rotor 202 has a hollow structure with a through groove 204. A heat pipe 502, extending through the through groove 204 and into the cold liquid chamber 5, is located on the surface of the support 301. The cold liquid chamber 5 is pre-filled with coolant. When the X-ray tube is in operation, the surface of the support 301 is in contact with the target plate. The support 301 is made of a high thermal conductivity material. The heat pipe 502 encapsulates an easily evaporable working fluid. The working fluid absorbs heat and vaporizes at the heated end. Under the action of pressure difference, the vapor flows to the end of the heat pipe 502 inside the cold liquid chamber 5. After reaching the end of the cold liquid chamber 5, it releases heat and liquefies. The liquid working fluid then flows back to the end of the cold liquid chamber 5 through the capillary structure of the heat pipe 502. The heated end near the target plate achieves high-speed and efficient long-distance heat transfer through continuous phase change of the working fluid, thereby cooling the target plate. Compared with the traditional single heat dissipation method of filling the outside of the glass cover with insulating oil, the innovative use of the fork bracket 205 mounting structure in conjunction with the bracket 301, along with the hollow rotating shaft 203 and the heat pipe 502 structure running through it, further cools the target plate, reduces the operating temperature of the target plate, and extends the service life of the X-ray tube assembly. The shaft seal 501 structure is located at the end of the cold liquid chamber 5, allowing the heat pipe 502 to rotate with the bracket 301 while preventing coolant leakage inside the cold liquid chamber 5.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An X-ray tube assembly for precious metal detection, comprising a tube shell (1), wherein an anode connector (101) is provided on one outer wall of the tube shell (1), and a negative electrode connector (102) is provided on the other outer wall, and a vacuum glass cover (2) is fixedly installed inside the tube shell (1); characterized in that, An extension tube (201) is integrally formed at the end of the vacuum glass cover (2) and arranged coaxially. A transmission rotor (202) is installed inside the inner cavity of the extension tube (201) near the connection point of the vacuum glass cover (2). The extension tube (201) is connected to a rotating shaft (203) through the internal transmission rotor (202). The rotating shaft (203) can rotate synchronously with the transmission rotor (202) and the end of the rotating shaft (203) extends into the inner cavity of the vacuum glass cover (2). The interior of the rotating shaft (203) is oriented along its own central axis. A through slot (204) is provided through the shaft (203). A fork (205) is fixedly installed at the end of the shaft (203) inside the vacuum glass cover (2). A bearing (206) is embedded in the end of the fork (205) and a connecting ring (207) is movably connected through the bearing (206). Target plate A and target plate B are fixedly installed on both sides of the outer ring surface of the connecting ring (207). A motor stator (210) is coaxially fitted on the outer peripheral wall of the extension tube (201) and the area corresponding to the position of the internal transmission rotor (202).

2. The X-ray tube assembly device for precious metal detection according to claim 1, characterized in that, A spring (3) is fixedly connected to the end surface of the fork (205) away from the connecting ring (207). The fork (205) is elastically connected to a support (301) through the spring (3). The support (301) and the connecting ring (207) correspond to each other and are in the same relative position. The outer surfaces of the target plate A (208) and the target plate B (209) are vertically provided with matching insertion holes (302) at corresponding positions. The two ends of the surface of the support (301) facing the connecting ring (207) are vertically fixed with insertion rods (303). The insertion rods (303) are inserted into the insertion holes (302) at corresponding positions in a one-to-one correspondence. A metal ring (304) is glued and fixed to the surface of the support (301) near the spring (3). A magnetic ring (307) is detachably and coaxially fitted on the outer peripheral wall of the extension tube (201).

3. The X-ray tube assembly device for precious metal detection according to claim 2, characterized in that, A closed cold liquid chamber (5) is provided at one end of the extension tube (201) away from the vacuum glass cover (2). The internal cavity of the cold liquid chamber (5) is used to fill and store coolant to improve the heat dissipation and cooling effect. A shaft seal (501) is fixedly and sealed in the inner cavity of the extension tube (201) and at the inner side of the end of the cold liquid chamber (5). The extension tube (201) is rotated and limited by the shaft seal (501) and is movably connected to a heat pipe (502). One end of the heat pipe (502) extends into the cold liquid chamber (5) to complete the heat exchange contact. The other end of the heat pipe (502) is tightly fitted to the surface of the support (301).

4. The X-ray tube assembly device for precious metal detection according to claim 1, characterized in that, The tube shell (1) is fixed with a light-emitting seat (103) in the middle section by fasteners. A light-emitting hole (103) is opened on one side inside the light-emitting seat (103), and the opening position of the light-emitting hole (103) corresponds to the target plate installation position.

5. The X-ray tube assembly device for precious metal detection according to claim 1, characterized in that, The motor stator (210) end is fitted with a shielding ring (211) on the side facing the vacuum glass cover (2), and the cavity between the inside of the tube shell (1) and the outer wall of the vacuum glass cover (2) is filled with insulating oil.

6. The X-ray tube assembly device for precious metal detection according to claim 2, characterized in that, The fork (205) has symmetrically arranged limit holes (306) at both ends facing the extension tube (201) inside. A limit rod (305) that passes through the metal ring (304) and the limit hole (306) is fixed on one side of the surface of the support (301).

7. The X-ray tube assembly device for precious metal detection according to claim 1, characterized in that, A power supply pipe (4) is installed inside the vacuum glass cover (2) at the end away from the extension tube (201). The power supply pipe (4) is located inside the vacuum glass cover (2) and a mounting base (401) with a built-in filament assembly is fixed at one end. The light-emitting end of the mounting base (401) corresponds to the installation position of the target plate.

8. The X-ray tube assembly device for precious metal detection according to claim 3, characterized in that, The extension tube (201) is equipped with a heat dissipation ring (503) on the outer periphery of the corresponding section of the cold liquid cavity (5).

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