A D-ring pet magnetic thermotherapy device

Abstract

This utility model discloses a D-shaped coil pet magnetic thermotherapy device, belonging to the field of electromagnetic induction technology. The D-shaped coil pet magnetic thermotherapy device includes: a main unit, comprising a support platform and a coil assembly. The coil assembly is disposed on the support platform and forms a cavity. The coil assembly is used to pass current through it to generate an alternating magnetic field when the subject, for which a magnetic medium has been implanted at the lesion site, passes through the cavity; and a sliding plate, disposed on the support platform and moving along a first direction through the cavity. The side of the sliding plate opposite to the support platform is used to support the subject for which a magnetic medium has been implanted at the lesion site. Compared with the prior art, this application, by setting up a support platform, a coil assembly, and a sliding plate, generates an alternating magnetic field at the lesion site of the subject within the cavity when current is passed through the coil assembly, thereby performing magnetic thermotherapy on the subject. Furthermore, this application has a simple structure and is easy to install, making operation more convenient.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic induction technology, and specifically relates to a D-shaped ring pet magnetic thermotherapy device. Background Technology

[0002] In the field of veterinary clinical oncology treatment, traditional methods such as surgical resection, radiotherapy, and chemotherapy all have significant limitations. Magnetic Hyperthermia Therapy (MHT) has gradually gained attention due to its minimally invasive and targeted advantages, offering benefits such as unlimited depth, precise targeting, and repeatable treatment. However, it also has the following inherent drawbacks: the lack of an operating table or an inappropriately designed operating table makes the treatment device unsuitable for veterinary clinical applications; complex mechanical structure, high energy consumption, and large equipment footprint; and a lack of modular mechanical design, requiring integration with distributed magnetic field generation technology.

[0003] In conclusion, further improvements are needed for pet magnetic thermotherapy devices. Developing a more rationally designed, effective, and easily controllable magnetic induction tumor treatment technology solution is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0004] To address the aforementioned issues, the primary objective of this invention is to provide a D-ring pet magnetic thermotherapy device that solves the technical problems of current devices having complex mechanical structures, being unsuitable for clinical pet applications, and lacking a reasonable integration of mechanical design and magnetic field distribution generation technology.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] This invention provides a D-shaped collar pet magnetic thermotherapy device, comprising: a main unit including a support platform and a coil assembly, the coil assembly being disposed on the support platform and forming a cavity, the coil assembly generating an alternating magnetic field when a patient with a magnetic medium implanted at the lesion site passes through the cavity; and a sliding plate disposed on the support platform and moving along a first direction through the cavity, the side of the sliding plate opposite to the support platform supporting the patient with the magnetic medium implanted at the lesion site. By setting the coil assembly on the support platform, the coil assembly forming a cavity, and the sliding plate moving along the first direction through the cavity, the sliding plate supports the patient with the magnetic medium implanted at the lesion site, so that when the patient passes through the cavity of the coil assembly, an current is passed through the coil assembly to generate an alternating magnetic field at the lesion site for magnetic thermotherapy.

[0007] Furthermore, the support platform includes a support plate, and the sliding plate is slidably disposed on the support plate. The support plate and the coil assembly form a D-shaped ring. Specifically, the support plate and the sliding plate are arranged at intervals relative to each other. The support plate is used to support and mount the sliding plate. The D-shaped ring formation of the support plate and the coil assembly is designed so that the coil assembly forms a D-shaped working area on the support platform. Therefore, when the sliding plate moves into the cavity of the coil assembly, the shape and volume design of the D-shaped ring need to be able to accommodate the treatment object carried on the sliding plate.

[0008] Furthermore, the two ends of the coil assembly are respectively connected to opposite sides of the support plate, and the coil assembly and the support plate enclose the cavity, with the coil assembly being C-shaped or U-shaped; alternatively, the support plate passes through the coil assembly, and the coil assembly and the support plate enclose the cavity, with the coil assembly being D-shaped or O-shaped. This connection design between the coil assembly and the support plate increases the structural design diversity of the coil assembly, making it suitable for different needs of patients in the market. For example, the device can be adapted to patients of different types or body types.

[0009] Furthermore, the coil assembly and the support plate form a first included angle w, which is less than or equal to 90°. When the first included angle w formed by the coil assembly and the support plate is less than 90°, the diverse requirements of this utility model regarding the appearance of the device, the cavity's accommodating space, and the types of patients to be treated can be met.

[0010] Furthermore, the coil assembly includes multiple single coils, which are arranged at intervals around the first direction; the single coils are one of D-type, C-type, U-type, and O-type. By designing different arrangements of the single coils, the coil assembly can generate different alternating magnetic field ranges when current is applied, thereby generating a more accurate alternating magnetic field.

[0011] Furthermore, the host also includes a control component electrically connected to the sliding plate. The control component is used to drive the sliding plate's movement direction, displacement, or speed relative to the support platform. When the D-ring pet magnetic thermotherapy treatment device needs to operate, the control component first controls the sliding plate to move towards the end away from the coil assembly. The treatment subject with the magnetic medium implanted in the lesion is placed on the sliding plate. The control component then controls the sliding plate to move towards the end closer to the coil assembly, moving the treatment subject with the magnetic medium implanted in the lesion to the cavity position. Thus, when an alternating current is applied to the coil assembly, an alternating magnetic field is generated in the cavity, allowing the treatment subject to undergo magnetic thermotherapy within the cavity of the coil assembly.

[0012] Furthermore, the host also includes: a power supply component disposed on the support platform, the power supply component being connected to the coil assembly and used to provide alternating current to the coil assembly; a transformer disposed on the support platform, the transformer being connected to the power supply component and used to provide alternating voltage to the power supply component; and a control component electrically connected to the power supply component and the transformer, used to control the intensity or frequency of the alternating current.

[0013] Furthermore, the host also includes cooling pipes disposed inside the coil assembly, and the cooling pipes are arranged at intervals with the coil. By arranging the cooling pipes alternately with the coil assembly, the purpose of using the cooling pipes to fully cool the coil assembly is achieved, thereby reducing the heat loss of the coil assembly.

[0014] Furthermore, the support plate is provided with a first receiving groove and a second receiving groove on the side near the sliding plate. The first receiving groove and the second receiving groove are both recessed from the support plate along the third direction Z towards the side away from the sliding plate. The first receiving groove, the second receiving groove and the support plate together form a receiving cavity.

[0015] Furthermore, the sliding plate includes a first plate and a second plate that are fitted together. The second plate is disposed on the side of the first plate near the support plate. The two ends of the first plate protrude from the two ends of the second plate along the first direction. The second plate is slidably fitted into the receiving cavity. The first receiving groove is provided with a first limiting part, and the second receiving groove is provided with a second limiting part. The second plate is connected to the first limiting part and the second limiting part.

[0016] The beneficial effects of this utility model are as follows: Compared with the prior art, this application sets up a support platform, a coil assembly and a sliding plate. When current is passed through the coil assembly, an alternating magnetic field is generated in the cavity of the lesion site of the treatment object, thereby performing magnetothermal therapy on the treatment object. At the same time, the structure of this application is simple and easy to install, making the operation more convenient. Attached Figure Description

[0017] Figure 1 This is a 3D schematic diagram of a D-ring pet magnetic thermotherapy device.

[0018] Figure 2 This is an exploded view of a D-shaped pet magnetic thermotherapy device.

[0019] Figure 3 This is a front view of a D-ring pet magnetic thermotherapy device.

[0020] Figure 4 yes Figure 3 Cross-sectional view along the AA direction.

[0021] Figure 5 This is a left view of a D-ring pet magnetic thermotherapy device.

[0022] Figure 6 yes Figure 5 Cross-sectional view along the CC direction.

[0023] In the diagram: 10. Main unit; 11. Support platform; 111. Support plate; 112. First receiving slot; 113. Second receiving slot; 114. Retaining wall; 115. Top surface; 116. Bottom wall; 117. Slide rail; 118. Slider; 12. Coil assembly; 120. Cavity; 121. Single coil; 122. Outer shell; 13. Housing; 20. Sliding plate; 21. Second limiting part; 30. Control assembly; 40. Power supply assembly; 50. Voltage converter. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] To achieve the above objectives, the technical solution of this utility model is as follows:

[0026] See Figures 1-6 As shown, this embodiment provides a D-ring pet magnetic thermotherapy treatment device, including: a main unit 10, including a support platform 11 and a coil assembly 12. The coil assembly 12 is disposed on the support platform 11 and forms a cavity 120. The coil assembly 12 is used to generate an alternating magnetic field when the treatment object with a magnetic medium implanted at the lesion site passes through the cavity 120; a sliding plate 20 is disposed on the support platform 11 and moves along the first direction X through the cavity 120. The side of the sliding plate 20 away from the support platform 11 is used to support the treatment object with a magnetic medium implanted at the lesion site. By setting a coil assembly 12 on the support platform 11, the coil assembly 12 encloses and forms a cavity 120, and the sliding plate 20 moves along the first direction X through the cavity 120. The sliding plate 20 carries the treatment object whose lesion site has been implanted with magnetic media, so that when the treatment object passes through the cavity 120 of the coil assembly 12, after the current is passed through the coil assembly 12, the coil assembly 12 performs electromagnetic induction heating on the treatment object, so as to achieve the purpose of generating an alternating magnetic field at the lesion site of the treatment object for magnetothermal therapy.

[0027] Furthermore, the support platform 11 includes a support plate 111, and a sliding plate 20 is slidably disposed on the support plate 111. The support plate 111 and the coil assembly 12 enclose each other to form a D-shaped ring. The support plate 111 is disposed on the side of the support platform 11 near the coil assembly 12. Both the support plate 111 and the sliding plate 20 extend along the first direction X. The support plate 111 is used to support and slide the sliding plate 20. The positional design of the support plate 111 and the coil assembly 12 enclosing the D-shaped ring ensures that the coil assembly 12 forms a D-shaped working area on the support platform 11. Thus, when the sliding plate 20 moves into the cavity 120 of the coil assembly 12, the shape and volume design of the D-shaped ring can meet the purpose of accommodating the treatment object carried on the sliding plate 20.

[0028] Furthermore, the two ends of the coil assembly 12 are respectively connected to opposite sides of the support plate 111, wherein the coil assembly 12 is fixedly connected to the support plate 111, and the coil assembly 12 and the support plate 111 enclose a cavity 120. The cross-section of the cavity 120 in the first direction X is D-shaped, and the coil assembly 12 is C-shaped or U-shaped. Alternatively, the support plate 111 passes through the cavity 120 of the coil assembly 12, wherein the coil assembly 12 is fixedly connected to the support platform 11 and spaced apart from the support plate 111, and the coil assembly 12 and the sliding plate 20 enclose a cavity 120. The cross-section of the cavity 120 in the first direction X is D-shaped, and the coil assembly 12 is D-shaped or O-shaped. By setting the relative position and connection relationship between the coil assembly 12 and the support plate 111, the structural design diversity of the coil assembly 12 is increased, and more embodiments can be applied to different needs of treatment subjects in the market, such as more suitable for treatment subjects of different varieties or different body types.

[0029] Furthermore, the coil assembly 12 and the support plate 111 form a first included angle w, which is less than or equal to 90°. When the first included angle w formed by the coil assembly 12 and the support plate 111 is equal to 90°, the utilization rate of the coil assembly 12 is high. When the first included angle w formed by the coil assembly 12 and the support plate 111 is less than 90°, the diverse needs of this utility model for device appearance, storage space, and types of treatment objects can be met.

[0030] Furthermore, the coil assembly 12 includes a plurality of single coils 121, which are arranged at intervals around a first direction; the single coils 121 are one of D-type, C-type, U-type, and O-type. Preferably, any two adjacent single coils 121 are arranged parallel and equidistantly. By designing different arrangements of the single coils 121, the coil assembly 12 can generate different alternating magnetic field ranges when current is applied, thereby generating a more accurate alternating magnetic field.

[0031] Furthermore, the D-ring pet magnetic thermotherapy device of this invention also includes a control component 30, which is electrically connected to the sliding plate 20. The control component 30 is used to drive the sliding plate 20 relative to the support platform 11 in terms of movement direction, displacement, or speed. When the D-ring pet magnetic thermotherapy device needs to work, the control component 30 first controls the sliding plate 20 to move towards the end away from the coil assembly 12. The treatment object with the magnetic medium implanted in the lesion is placed on the sliding plate 20. The control component 30 then controls the sliding plate 20 to move towards the end closer to the coil assembly 12. The treatment object with the magnetic medium implanted in the lesion moves to the cavity 120 position, so that when the coil assembly 12 provides alternating current, the treatment object generates an alternating magnetic field in the cavity 120 of the coil assembly 12 for magnetic thermotherapy.

[0032] Furthermore, the D-shaped ring pet magnetic thermotherapy device of this utility model also includes a power supply component 40, which is disposed on the support platform 11 and electrically connected to the coil assembly 12. The power supply component 40 is used to provide alternating current to the coil assembly 12.

[0033] Furthermore, the D-ring pet magnetic thermotherapy device of this utility model also includes a transformer 50, which is disposed on the support platform 11 and connected to the power supply component 40 to provide alternating voltage to the power supply component 40.

[0034] Furthermore, the control component 30 is electrically connected to the power supply component 40 and the transformer 50. The control component 30 is used to control the intensity or frequency of the alternating current generated by the coil assembly 12. By connecting the control component 30 to the power supply component 40 or the transformer 50, the intensity or frequency of the alternating current generated by the coil assembly 12 can be controlled, thereby controlling the alternating frequency of the generated magnetic field or the magnitude of the central magnetic field strength when the coil assembly 12 performs electromagnetic induction heating on the treatment object.

[0035] Furthermore, the main unit 10 also includes cooling pipes (not shown), which are disposed inside the coil assembly 12 and are arranged alternately with the single coil 121. Furthermore, the coil assembly 12 includes a housing 122, which is a hollow structure. The cooling pipes are located inside the housing 122, which houses and encloses the single coil 121 and the cooling pipes. By arranging the cooling pipes alternately with the coil assembly 12, the cooling pipes effectively cool the coil assembly 12, reducing heat loss. Furthermore, the control component 30 is connected to the cooling pipes and is used to control the cooling pipes to provide a cold source to the coil assembly 12 or to stop providing a cold source to the coil assembly 12.

[0036] Furthermore, a first receiving groove 112 and a second receiving groove 113 are provided on the side of the support plate 111 near the sliding plate 20. Both the first receiving groove 112 and the second receiving groove 113 are recessed from the surface of the support plate 111 along a third direction Z toward the side opposite to the sliding plate 20. The support plate 111, the first receiving groove 112, and the second receiving groove 113 enclose a receiving cavity. Preferably, the first receiving groove 112 and the second receiving groove 113 extend along a first direction X and are spaced apart from each other. The first receiving groove 112 and the second receiving groove 113 are aligned along a second direction Y. The depths of the first receiving groove 112 and the second receiving groove 113 along the third direction Z are equal. More preferably, a hollow design is added between the first receiving groove 112 and the second receiving groove 113 to save material and reduce weight.

[0037] Furthermore, the sliding plate 20 includes a first plate 21 and a second plate 22 that are fitted together. The second plate 22 is disposed on the side of the first plate 21 near the support plate 111. The two ends of the first plate 21 protrude along the first direction X and are respectively disposed on the two ends of the second plate 22. The two sides of the first plate 21 are respectively aligned along the second direction Y and are respectively disposed on the two sides of the second plate 22. The first plate 21 and the second plate 22 are fixedly connected, and the second plate 22 is slidably fitted in the receiving cavity.

[0038] Furthermore, a first limiting part is provided in the first receiving groove 112, and a second limiting part is provided in the second receiving groove 113; the second plate 22 is slidably disposed in the first receiving groove 112 through the first limiting part, and the second plate 22 is slidably disposed in the second receiving groove 113 through the second limiting part.

[0039] Furthermore, either the first limiting part or the second limiting part includes a slide rail 117 extending along the first direction X, a slider 118 slidably disposed on the slide rail 117, and the side of the second plate 22 facing away from the first plate 21 is fixedly connected to the slider 118.

[0040] It should be noted that, in order to prevent the second plate 22 of the sliding plate 20 from falling due to excessive displacement from the support plate 111, a baffle 114 is provided at the end of the support plate 111 away from the coil assembly 12 along the first direction X. The top surface 115 of the baffle 114 along the third direction Z is higher than the bottom wall 116 of the first receiving groove 112 and the bottom wall 116 of the second receiving groove 113, so that the second plate 22 always moves within the receiving cavity along the first direction X. Through the design of the baffle 114 and the receiving cavity, the sliding plate 20 is limited and protected, reducing the risk of the treatment object falling when it is on the sliding plate 20.

[0041] Alternatively, either the first limiting part or the second limiting part is not specifically configured as a slide rail 117 and a slider 118. The support plate 111 has a first limiting part extending along the first direction X on the side near the sliding plate 20; the sliding plate 20 has a second limiting part on the side near the support plate 111, and the second limiting part slidably engages with the first limiting part. By providing a first limiting part on the support plate 111 and a second limiting part on the sliding plate 20, the first limiting part and the second limiting part slidably engage, achieving the purpose of slidingly mounting the sliding plate 20 onto the support plate 111.

[0042] Furthermore, the splicing design between the first receiving groove 112 and the second receiving groove 113 replaces the hollow design between the first receiving groove 112 and the second receiving groove 113 in the above embodiment. There is one first limiting part; or, there are multiple first limiting parts, and the multiple first limiting parts are arranged parallel to each other in the second direction Y, and the second direction Y is perpendicular to the first direction X; there is one or more sets of second limiting parts, and the second limiting parts are arranged corresponding to the first limiting parts, and the second limiting parts are connected to the sliding plate 20. When there is one first limiting part and one set of second limiting parts, the first limiting part is arranged along the first direction X on the center line of the support plate 111, and the second limiting part is arranged along the first direction X on the center line of the sliding plate 20, so that the sliding plate 20 slides stably on the support plate 111; when there are multiple first limiting parts and multiple sets of second limiting parts, the first limiting parts are symmetrically arranged along the first direction X on the support plate 111. Through multiple sets of sliding cooperation between the first limiting part and the second limiting part, the limiting cooperation between the sliding plate 20 and the support plate 111 increases the support, so that the sliding plate 20 moves more stably.

[0043] In addition, the main unit 10 also includes a housing 13, which is used to enclose the support platform 11, power supply assembly 40, transformer 50 and control assembly 30, making the appearance of the main unit 10 neat and reducing the external volume and floor space of the main unit 10.

[0044] The procedure for using the D-ring pet magnetic thermotherapy device of this invention to treat subjects with implanted magnetic media at the lesion site includes:

[0045] Before treatment, take appropriate hygiene and disinfection measures, such as trimming the treatment area and disinfecting the injection area with povidone-iodine.

[0046] After determining the appropriate dosage, use a 23-27 gauge needle to draw the necessary volume into a sterile syringe;

[0047] During injection, insert the needle into a single injection site on the tumor mass; while applying uniform pressure to the syringe plunger, move the needle back and forth to inject the veterinary drug into different locations within the tumor; ensure that the injection is confined to the tumor mass only, and do not inject into the tumor edge or beyond the tumor periphery;

[0048] After injecting the full dose of veterinary drug, pause for 5 seconds to allow it to disperse into the tissue before removing the needle from the tumor;

[0049] After injection, the location of the magnetorheological fluid was determined by CT scan, and then the pet was placed in the magnetic field generating device.

[0050] Adjust the intensity and frequency of the magnetic field generator, and wait for the temperature in the center of the heat therapy area to reach a stable 46°C before continuing the treatment for another 15 minutes.

[0051] It should be noted that the magnetic medium implanted at the lesion site is equivalent to a magnetorheological fluid. The main component of the magnetorheological fluid is PEG2000-coated iron oxide nanoparticles at a concentration of 200 mg / mL, or a concentration of 112 mg / mL (in Fe). This invention is primarily used for treating solid tumors in cats and dogs, and is suitable for tumors with a volume of 1 cm². 3 ~8cm 3 Within a suitable range and easily administered intratumorally. The magnetic fluid is stored in a vial for intratumoral injection, with an injection dose of [missing information - likely a unit of measurement] cm². 3 Inject 0.2 μL of magnetic fluid into the tumor volume. The formula for calculating the tumor size must satisfy: Tumor volume (cm²) 3 The formula for calculating tumor volume (length * width * height) is π / 6, which is closer to the actual volume. The dosage calculation formula satisfies: Injection volume (mL) = Tumor volume (cm²). 3 )*0.2.

[0052] This utility model provides a D-shaped coil pet magnetic thermotherapy device, comprising: a main unit 10, including a support platform 11 and a coil assembly 12. The coil assembly 12 is disposed on the support platform 11 and forms a cavity 120. The coil assembly 12 is used to pass current through it to generate an alternating magnetic field when the subject with a magnetic medium implanted at the lesion site passes through the cavity 120; and a sliding plate 20, disposed on the support platform 11 and moving along the first direction X through the cavity 120. The side of the sliding plate 20 facing away from the support platform 11 is used to support the subject with the magnetic medium implanted at the lesion site. Compared with the prior art, this application, by setting up the support platform 11, the coil assembly 12, and the sliding plate 20, generates an alternating magnetic field at the lesion site of the subject within the cavity 120 when current is passed through the coil assembly 12, thereby performing magnetic thermotherapy on the subject. Furthermore, this application has a simple structure and is easy to install, making operation more convenient.

[0053] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A D-shaped pet magnetic thermotherapy device, characterized in that, include: The host includes a support platform and a coil assembly. The coil assembly is disposed on the support platform and forms a cavity. The coil assembly is used to generate an alternating magnetic field when a treatment object with a magnetic medium implanted at the lesion site passes through the cavity. A sliding plate is disposed on the support platform and moves along the first direction through the cavity. The side of the sliding plate opposite to the support platform is used to support the treatment object on which magnetic media has been implanted at the lesion site.

2. The D-ring pet magnetic thermotherapy device as described in claim 1, characterized in that, The support platform includes a support plate, and the sliding plate is slidably disposed on the support plate. The support plate and the coil assembly are enclosed to form a D-shaped ring.

3. The D-ring pet magnetic thermotherapy device as described in claim 2, characterized in that, The two ends of the coil assembly are respectively connected to the opposite sides of the support plate, and the coil assembly and the support plate enclose the cavity; or, the support plate passes through the coil assembly, and the coil assembly and the support plate enclose the cavity.

4. The D-ring pet magnetic thermotherapy device as described in claim 2, characterized in that, The coil assembly and the carrier plate form a first included angle w, where the first included angle w is less than or equal to 90°.

5. The D-ring pet magnetic thermotherapy device as described in claim 2, characterized in that, The coil assembly includes a plurality of single coils, which are arranged at intervals around the first direction; the single coils are one of D-type, C-type, U-type, and O-type.

6. The D-ring pet magnetic thermotherapy device as described in claim 1, characterized in that, The host also includes a control component electrically connected to the sliding plate, which is used to drive the sliding plate to move in the direction, displacement or speed relative to the support platform.

7. The D-ring pet magnetic thermotherapy device as described in claim 6, characterized in that, The host also includes: A power supply assembly is disposed on the support platform, the power supply assembly is connected to the coil assembly and is used to provide alternating current to the coil assembly; A transformer is mounted on the support platform, and the transformer is connected to the power supply assembly and is used to provide alternating voltage to the power supply assembly; The control component is electrically connected to the power supply component and the transformer, and is used to control the intensity or frequency of the alternating current.

8. The D-ring pet magnetic thermotherapy device as described in claim 1, characterized in that, The host also includes cooling pipes, which are disposed inside the coil assembly and are arranged at intervals from the coil.

9. A D-ring pet magnetic thermotherapy device as described in claim 2, characterized in that, The support plate is provided with a first receiving groove and a second receiving groove on the side near the sliding plate. The first receiving groove and the second receiving groove are both recessed from the support plate along the third direction Z towards the side away from the sliding plate. The first receiving groove, the second receiving groove and the support plate together form a receiving cavity.

10. A D-ring pet magnetic thermotherapy device as described in claim 9, characterized in that, The sliding plate includes a first plate and a second plate that are fitted together. The second plate is disposed on the side of the first plate that is close to the support plate. The two ends of the first plate protrude from the two ends of the second plate along the first direction, and the second plate is slidably fitted into the receiving cavity. The first receiving groove is provided with a first limiting part, the second receiving groove is provided with a second limiting part, and the second plate is connected to the first limiting part and the second limiting part.

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