DNA ploidy staining solution batch adding device

Abstract

The utility model provides a DNA (Deoxyribose Nucleic Acid) ploidy staining solution batch adding device, which relates to the technical field of reagent adding and comprises a supporting and limiting mechanism, a DNA ploidy staining solution batch adding mechanism and a DNA ploidy staining solution batch adding mechanism, the staining fluid storage mechanism is arranged at the top of the supporting and limiting mechanism, and the staining fluid storage mechanism can be used for storing a fluid body; the staining fluid release mechanism is arranged on the staining fluid storage mechanism and can pressurize the fluid in the staining fluid storage mechanism, so that the fluid flows out from the bottom of the staining fluid storage mechanism. During use, the liquid storage box is supported through the supporting frame, the liquid storage box is filled with staining fluid, and meanwhile, the staining fluid in the liquid storage box is pressurized through the man-machine interaction part arranged on the liquid storage box; therefore, the staining solution enters a test tube in a test tube hole plate placed above the sliding platform through the dropping pipette under the action of pressure, and the effect of adding the staining solution in batches is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to reagent adding technical field, especially a kind of DNA ploidy dyeing liquid batch adding device. BACKGROUND

[0002] DNA ploidy, in short, refers to the multiple of DNA in cells. Under normal circumstances, the DNA in human somatic cells is diploid, i.e. having 23 pairs of chromosomes, a total of 46. This means that the genetic material DNA on each chromosome has a duplicate, i.e. an allele. However, in certain specific circumstances, such as disease states, especially when malignant tumors occur, the DNA content of tumor cells will be abnormal, forming hyperdiploid, triploid, and even tetraploid, octoploid and other polyploid phenomena.

[0003] DNA ploidy analysis technology is a detection method that determines whether cells have pathological changes (especially tumor lesions) by measuring the DNA content or ploidy in stained cell nuclei. In the early screening of cervical cancer and other malignant tumors, DNA ploidy analysis technology plays an important role. Through this technology, we can detect potential cancer cells before cell morphological changes, giving patients the opportunity to be treated and cured early.

[0004] The basic principle of DNA ploidy analysis technology is to label and stain DNA in cell nuclei using special reagents, making DNA in cells more easily identifiable, and then observing the DNA content and ploidy changes of these cells under a microscope. Therefore, the addition of dyeing liquid is particularly important in DNA ploidy analysis.

[0005] Research units or hospital laboratories will have a large number of samples to be tested and analyzed. Therefore, a large number of samples need to be added with dyeing liquid. The existing technology is to add one test tube at a time using a dropper, pipette or other equipment, which increases the workload and is not efficient.

[0006] Therefore, the present application proposes a DNA ploidy dyeing liquid batch adding device to realize batch addition of dyeing liquid and improve the addition efficiency of dyeing liquid. UTILITY MODEL CONTENT

[0007] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a DNA ploidy dyeing liquid batch adding device to solve the problem of low efficiency of adding dyeing liquid to a single test tube in the prior art.

[0008] To achieve the above-mentioned purposes and other related purposes, the utility model provides a DNA ploidy dyeing liquid batch adding device, comprising:

[0009] The support limiting mechanism can be used to support the whole device.

[0010] The dye solution storage mechanism is arranged on the top of the support limiting mechanism, and can be used to store the liquid body.

[0011] The dye solution releasing mechanism is arranged on the dye solution storage mechanism, and can pressurize the liquid body in the dye solution storage mechanism to make the liquid body flow out from the bottom of the dye solution storage mechanism.

[0012] The test tube hole disc limiting mechanism is arranged directly below the dye solution storage mechanism, and can be used to support and limit the external test tube hole disc, so that the liquid body flowing out from the bottom of the dye solution storage mechanism can enter the test tube on the test tube hole disc.

[0013] Preferably, the support limiting mechanism comprises a support base, a limiting sliding groove penetrating through the front surface of the support base is arranged on the support base, and a support frame is arranged at the back of the top of the support base.

[0014] The test tube hole disc limiting mechanism is arranged inside the limiting sliding groove and can slide forward and backward, and the dye solution storage mechanism is arranged on the top of the support frame and is supported.

[0015] Preferably, the dye solution storage mechanism comprises a liquid storage tank, a liquid injection area is arranged on the top of the liquid storage tank, and a plurality of liquid outlet holes are arranged at the bottom of the liquid storage tank and are distributed at equal intervals.

[0016] The bottom of the liquid storage tank is provided with a liquid drop pipe which is matched with the number and position of the liquid outlet holes.

[0017] Preferably, a flow limiting plug is arranged in each liquid outlet hole, and a through hole is arranged in the middle of all the flow limiting plugs and can be expanded after being pressed.

[0018] Preferably, the flow limiting plug comprises a rubber column, a tapered groove is arranged at the axis of the top of the rubber column, and a flow passage hole is arranged at the axis of the tapered groove.

[0019] The flow passage hole can be expanded after being pressed.

[0020] Preferably, the liquid drop pipe comprises a telescopic bellows and a connecting plate, and a tapered drop head is arranged at the lower end of the telescopic bellows.

[0021] All the connecting plates are connected from the connection between the telescopic bellows and the tapered drop head.

[0022] Preferably, the dyeing liquid releasing mechanism comprises a pressurizing component and an air injection pipe, the front surface of the pressurizing component is provided with a human-computer interaction part, the air injection pipe is arranged on the inner wall of the liquid storage tank, and the pressurizing component and the air injection pipe are in communication.

[0023] Preferably, the pressurizing component is a pressurizing pump, the air injection pipe is arranged on the upper portion of the inner wall of the liquid storage tank, and the air injection pipe is arranged in a loop along the inner wall of the liquid storage tank.

[0024] Preferably, the test tube cavity disc limiting mechanism comprises a sliding platform, sliding guide rails are arranged on the two sides of the sliding platform, a cavity disc limiting groove is arranged on the top of the sliding platform and used for placing a test tube cavity disc, and a correction chamfer is arranged on the edge of the cavity disc limiting groove.

[0025] Preferably, a permanent magnet is arranged on the rear portion of the inner wall of the limiting sliding groove, a magnetic attraction strip is arranged on the back surface of the sliding platform, and the permanent magnet and the magnetic attraction strip can be mutually adsorbed.

[0026] As described above, the DNA ploidy dyeing liquid batch adding device has the following beneficial effects:

[0027] 1、The liquid storage tank is supported by the support frame, the dyeing liquid is filled in the liquid storage tank, the dyeing liquid in the liquid storage tank is pressurized through the human-computer interaction part arranged on the liquid storage tank, so that the dyeing liquid enters the test tube in the test tube cavity disc above the sliding platform through the droplet pipe under the action of pressure, and the effect of batch adding of the dyeing liquid is achieved.

[0028] 2、Meanwhile, the telescopic bellows are arranged, all the telescopic bellows are connected through the connecting plate, when the test tube is placed or the dyeing agent is injected, the height of the conical droplet head can be adjusted through the telescopic property of the telescopic bellows, interference on the placement of the test tube can be avoided, and the distance between the conical droplet head and the test tube is large, liquid splashing is avoided, and the effect of improving use convenience is achieved.

[0029] Therefore, the DNA ploidy dyeing liquid batch adding device effectively overcomes various defects in the prior art and has high industrial utilization value. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 A structure schematic view after the test tube cavity disc is installed in the DNA ploidy dyeing liquid batch adding device is shown.

[0031] Figure 2 An exploded view of the DNA ploidy dyeing liquid batch adding device is shown.

[0032] Figure 3 A structure schematic view of the DNA ploidy dyeing liquid batch adding device is shown.

[0033] Figure 4The structure inside the liquid storage tank of the utility model is shown.

[0034] Figure 5 The structure inside the liquid storage tank of the utility model is shown. Figure 1 The structure of A in the utility model is shown.

[0035] Figure 6 The structure of the flow limiting plug of the utility model is shown.

[0036] Figure 7 The structure of B in the utility model is shown. Figure 2 The structure of B in the utility model is shown.

[0037] Figure 8 The structure of the test tube plug tray limiting mechanism of the utility model is shown.

[0038] Element number explanation

[0039] 1, support limiting mechanism; 101, support base; 102, limiting sliding groove; 103, support frame; 104, permanent magnet;

[0040] 2, dyeing liquid storage mechanism; 201, liquid storage tank; 202, liquid injection area; 203, liquid outlet hole; 204, liquid drop pipe; 2041, telescopic corrugated pipe; 2042, conical drop head; 2043, connecting plate; 205, flow limiting plug; 2051, rubber column; 2052, conical groove; 2053, flow-through hole;

[0041] 3, dyeing liquid release mechanism; 301, pressurizing part; 302, human-computer interaction part; 303, gas injection pipe;

[0042] 4, test tube plug tray limiting mechanism; 401, sliding platform; 402, sliding guide rail; 403, plug tray limiting groove; 404, correction chamfer; 405, magnetic attraction strip. DETAILED DESCRIPTION

[0043] The following specific embodiments illustrate the implementation of the utility model, and those skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in the specification.

[0044] Please refer to Figures 1 to 8It is to be understood that the structures, proportions, sizes, etc. shown in the drawings accompanying the present specification are merely intended to facilitate the understanding of the content disclosed in the present specification for those skilled in the art to understand and read, and are not intended to limit the implementation of the present application, and therefore do not have substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the functions and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the present specification are merely for the convenience of clear description, and are not intended to limit the scope of the present application, and the change or adjustment of the relative relationship without substantial change of the technical content is also considered as the scope of the present application.

[0045] As shown in Figures 1-3 The present application provides a DNA diploid dyeing liquid batch adding device, which comprises a support limiting mechanism 1, a dyeing liquid storage mechanism 2, a dyeing liquid releasing mechanism 3 and a test tube hole plate limiting mechanism 4. The support limiting mechanism 1 can be used to support the entire device to ensure that the entire device can be placed stably. The dyeing liquid storage mechanism 2 is arranged at the top of the support limiting mechanism 1, and the dyeing liquid storage mechanism 2 can be used to store liquid bodies such as dyeing liquid for standby. The dyeing liquid releasing mechanism 3 is arranged on the dyeing liquid storage mechanism 2, and can pressurize the liquid bodies in the dyeing liquid storage mechanism 2, so that the liquid bodies flow out from the bottom of the dyeing liquid storage mechanism 2 under pressure. Because the delivery of pressure is controllable, the dyeing liquid storage mechanism 2 can also achieve the effect of quantitative output. The test tube hole plate limiting mechanism 4 is arranged directly below the dyeing liquid storage mechanism 2, and the dyeing liquid storage mechanism 2 can be used to support and limit the external test tube hole plate, so that the liquid bodies flowing out from the bottom of the dyeing liquid storage mechanism 2 can enter the test tubes on the test tube hole plate.

[0046] As shown in Figure 2 In some embodiments, the support limiting mechanism 1 of the present application comprises a support base 101, which is the bottommost part of the entire device and is used to maintain the stability of the entire device after being placed. The support base 101 is provided with a limiting sliding groove 102 penetrating through the front surface of the support base 101, which is used to limit the test tube hole plate limiting mechanism 4, so as to ensure that the position of the test tube hole plate limiting mechanism 4 after being placed is unique. A support frame 103 is arranged at the rear top of the support base 101. The support frame 103 is used to raise the height of the entire device. The dyeing liquid storage mechanism 2 is arranged at the top of the support frame 103 and is supported, so that there is space between the dyeing liquid storage mechanism 2 and the test tube hole plate limiting mechanism 4 for placing the test tube hole plate and the test tubes.

[0047] The test tube hole disc limiting mechanism 4 is arranged inside the limiting sliding groove 102 and can slide forward and backward. When the test tube hole disc needs to be placed, the test tube hole disc limiting mechanism 4 can be pulled out to place the test tube hole disc, so as to avoid the blockage caused by the dyeing liquid storage mechanism 2. After the test tube hole disc is placed, the test tube hole disc limiting mechanism 4 can be pushed back, so that the test tube is located directly below the dyeing liquid storage mechanism 2.

[0048] As shown in Figures 3-4 In some embodiments, the dyeing liquid storage mechanism 2 includes a liquid storage box 201, and the liquid storage box 201 has a cavity inside. The cavity can be used to pre-store liquid, such as dyeing liquid used for DNA ploidy analysis. The top of the liquid storage box 201 is provided with a liquid injection area 202, which is composed of an open mouth and a separable sealing cover. The sealing cover covers the open mouth. The liquid is added to the inside of the liquid storage box 201 through the liquid injection area 202. In order to further improve the convenience of use, the liquid storage box 201 can be made of transparent material to facilitate observation of the liquid level inside the liquid storage box 201. The bottom of the liquid storage box 201 is provided with a plurality of equidistantly distributed liquid outlet holes 203. The bottom of the liquid storage box 201 is provided with a liquid drop pipe 204 which is matched with the number and position of the liquid outlet holes 203. When the inside of the liquid storage box 201 is pressurized, the liquid passes through the liquid outlet holes 203 into the liquid drop pipe 204 and is introduced into each test tube through the liquid drop pipe 204. When the liquid surface inside the liquid storage box 201 is in a horizontal state, increasing the pressure inside the liquid storage box 201 can make the liquid enter all the liquid outlet holes 203 uniformly.

[0049] As shown in Figure 4 In some embodiments, the inside of each liquid outlet hole 203 is plugged with a flow limiting plug 205, and the middle of all flow limiting plugs 205 is provided with a through hole which can expand under pressure. Under normal pressure, the through holes in the flow limiting plug 205 are squeezed together to prevent the liquid from passing through. When the pressure inside the liquid storage box 201 increases, the liquid will squeeze the through hole in the middle of the flow limiting plug 205 under the action of the pressure, so that the liquid can pass through the through hole, realizing the addition of the liquid.

[0050] As shown in Figure 6As shown, in some embodiments, the utility model current limiting plug 205 includes rubber column 2051, the top of rubber column 2051 is provided with tapered groove 2052 on the axis. The tapered groove 2052 can be set to enable the liquid storage tank 201 to concentrate in the middle of the rubber column 2051. The axis of the tapered groove 2052 is provided with flow hole 2053, which can be expanded after being pressed. The flow hole 2053 is the through hole mentioned above, which is in a sealed state in the initial state, and after being pressed, the rubber column 2051 will deform, thereby extruding the flow hole 2053 to form a channel. When the internal and external pressures of the liquid storage tank 201 are balanced, the flow hole 2053 will be re-closed under the elasticity of the rubber column 2051 material. Therefore, the quantitative delivery of the internal pressure of the liquid storage tank 201 can achieve the effect of quantitative delivery of the dyeing solution.

[0051] As shown, Figure 5 In some embodiments, the utility model liquid drop pipe 204 includes telescopic bellows 2041 and connecting plate 2043. The lower end of the telescopic bellows 2041 is provided with a tapered drop head 2042. The liquid flows from the telescopic bellows 2041 and flows into the test tube from the tapered drop head 2042, realizing the addition of the dyeing solution. The telescopic bellows 2041 adjusts the height of the tapered drop head 2042 to realize the placement and adaptation of test tubes of different heights. The connecting plate 2043 connects all the connecting plates 2043 from the connection between the telescopic bellows 2041 and the tapered drop head 2042. After setting the connecting plate 2043, the height of the tapered drop head 2042 does not need to be adjusted one by one, but can be uniformly adjusted through the connecting plate 2043, improving the convenience of use.

[0052] As shown, Figures 3-4 In some embodiments, the utility model dyeing solution release mechanism 3 includes a pressurizing component 301 and an air injection pipe 303. The front of the pressurizing component 301 is provided with a human-computer interaction part 302, which is used for setting the working instructions of the pressurizing component 301, so that the pressurizing component 301 works as needed. The human-computer interaction part 302 can be a physical button, a touch screen, a sensing device, etc. which can interact with the human-computer interaction part 302. To improve convenience, a display screen can be adapted to display the input instructions and the working state of the pressurizing component 301. The air injection pipe 303 is arranged on the inner wall of the liquid storage tank 201, and the pressurizing component 301 and the air injection pipe 303 are interconnected. When the pressurizing component 301 works, it will deliver gas to the inside of the liquid storage tank 201 through the air injection pipe 303 to increase the pressure inside the liquid storage tank 201.

[0053] As shown, Figure 4As shown, in some embodiments, the pressurizing component 301 of this invention is a pressurizing pump, which inputs pressure into the liquid storage tank 201 during operation. The air injection pipe 303 is located on the upper part of the inner wall of the liquid storage tank 201, which can minimize the interference of the liquid stored inside the liquid storage tank 201 with the air injection pipe 303. Furthermore, the air injection pipe 303 is arranged to circulate along the inner wall of the liquid storage tank 201, which can improve the uniformity of the initial pressure output and improve the accuracy of adding the dyeing solution.

[0054] like Figures 2-3 and Figure 8 As shown, in some embodiments, the test tube tray limiting mechanism 4 of this utility model includes a sliding platform 401. Sliding guide rails 402 are provided on both sides of the sliding platform 401 to limit and improve the accuracy of insertion of the sliding platform 401. A tray limiting groove 403 is provided at the top of the sliding platform 401 for placing the test tube tray, ensuring the tray's position is unique. A corrective chamfer 404 is provided at the edge of the tray limiting groove 403. During the placement of the test tube tray, if a slight deviation occurs, the inclined surface of the corrective chamfer 404 will cause the test tube tray to slide completely into the tray limiting groove 403 under the action of gravity.

[0055] like Figures 7-8 As shown, in some embodiments, a permanent magnet 104 is provided on the rear part of the inner wall of the limiting slide groove 102 of this utility model, and a magnetic strip 405 is provided on the back of the sliding platform 401. The permanent magnet 104 and the magnetic strip 405 can attract each other. After the sliding platform 401 is fully pushed into the limiting slide groove 102, the permanent magnet 104 and the magnetic strip 405 attract each other, thereby preventing the sliding platform 401 from continuing to slide and causing a deviation in the position of the test tube and the dropper 204.

[0056] The specific usage process of this utility model is as follows:

[0057] A large amount of dyeing solution is injected into the liquid storage tank 201 through the injection area 202 for later use, and the injection area 202 is sealed tightly.

[0058] When adding DNA ploidy staining solution, push up the connecting plate 2043 to raise the conical dropper 2042 and pull out the sliding platform 401 so that most of the sliding guide rail 402 is outside the support base 101.

[0059] Place the test tube tray with the test tube inside the sliding guide rail 402 and ensure that the test tube tray is in a stable state.

[0060] Push the sliding platform 401 until it is fully inserted into the limiting groove 102, and gently pull the sliding platform 401 to confirm that the permanent magnet 104 and the magnetic strip 405 are attracted together;

[0061] Push the connecting plate 2043 downward, so that the conical drop head 2042 is inserted into the test tube, and the working mode of the pressurizing component 301 is set through the human-computer interaction part 302, and the pressurizing component 301 is started;

[0062] After the completion of the dyeing liquid addition, the connecting plate 2043 is pushed upward, so that the conical drop head 2042 is separated from the test tube;

[0063] The sliding platform 401 is pulled out, and the test tube hole disc and the test tube are taken out from the inside of the sliding guide rail 402 for DNA ploidy analysis.

[0064] In summary, the DNA ploidy dyeing liquid batch adding device of the utility model, through the support frame 103 supports the liquid storage tank 201, and fills the dyeing liquid in the inside of the liquid storage tank 201, and through the human-computer interaction part 302 set up on the liquid storage tank 201, the dyeing liquid in the inside of the liquid storage tank 201 is pressurized, so that the dyeing liquid is under the action of pressure and enters the test tube in the test tube hole plate above the sliding platform 401 through the liquid drop pipe 204, reaches the effect that dyeing liquid can be added in batches.

[0065] Meanwhile, the utility model discloses a telescopic bellows 2041 is set up, and all telescopic bellows 2041 are connected through the connecting plate 2043, when placing the test tube or injecting the dyeing agent, the height of the conical drop head 2042 can be adjusted through the telescopic property of telescopic bellows 2041, can avoid the interference caused to the placement of the test tube and avoid the distance between the conical drop head 2042 and the test tube is large and splashes, reaches the effect that the use convenience is improved.

[0066] Therefore, the utility model effectively overcomes the various shortcomings in the prior art and has a high industrial utilization value.

[0067] The above embodiment only illustrates the principle and effect of the utility model, and is not used to limit the utility model. Any person skilled in the art can modify or change the above embodiment without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the utility model should be covered by the claims of the utility model.

Claims

1. A DNA ploidy staining solution batch adding device, characterized by, The utility model provides a kind of dyeing liquid releasing mechanism (3), which is arranged on the dyeing liquid storage mechanism (2), the liquid in the dyeing liquid storage mechanism (2) can be pressurized, so that the liquid flows out from the bottom of the dyeing liquid storage mechanism (2). The utility model provides a kind of test tube hole disc limiting mechanism (4), which is arranged below the dyeing liquid storage mechanism (2), and is used for supporting and limiting the external test tube hole disc, so that the liquid flowing out from the bottom of the dyeing liquid storage mechanism (2) can enter the test tube on the test tube hole disc. The utility model provides a kind of support limiting mechanism (1), which can be used to support the whole device. The utility model provides a kind of dyeing liquid storage mechanism (2), which is arranged on the top of the support limiting mechanism (1), and is used to store liquid. The utility model provides a kind of support base (101), which is provided with a limiting sliding groove (102) penetrating through the front surface of the support base (101), and a support frame (103) is arranged at the top of the rear of the support base (101).

2. The DNA ploidy staining liquid batch adding device according to claim 1, characterized in that: The test tube hole disc limiting mechanism (4) is arranged inside the limiting sliding groove (102) and can slide forward and backward, and the dyeing liquid storage mechanism (2) is arranged on the top of the support frame (103) and is supported. The utility model provides a kind of liquid storage tank (201), which is provided with a liquid injection area (202) at the top, and a plurality of liquid outlet holes (203) are arranged at the bottom in equidistant distribution.

3. The DNA ploidy staining liquid batch adding device according to claim 1, characterized in that: The bottom of the liquid storage tank (201) is provided with a liquid drop pipe (204) matched with the number and position of the liquid outlet holes (203). The inside of each liquid outlet hole (203) is plugged with a flow limiting plug (205), and a through hole is arranged in the middle of all flow limiting plugs (205), which can expand after being pressed.

4. The DNA ploidy staining liquid batch adding device according to claim 3, characterized in that: The flow limiting plug (205) includes a rubber column (2051), a tapered groove (2052) is arranged at the axis of the top of the rubber column (2051), and a flow passage (2053) is arranged at the axis of the tapered groove (2052).

5. The DNA ploidy staining liquid batch adding device according to claim 4, characterized in that: The flow passage (2053) can expand after being pressed. The liquid drop pipe (204) includes a telescopic bellows (2041) and a connecting plate (2043), and a tapered drop head (2042) is arranged at the lower end of the telescopic bellows (2041).

6. The DNA ploidy staining liquid batch adding device according to claim 3, characterized in that: The connecting plate (2043) connects all connecting plates (2043) from the connection between the telescopic bellows (2041) and the tapered drop head (2042). The dyeing liquid releasing mechanism (3) includes a pressurizing component (301) and a gas injection pipe (303), the front surface of the pressurizing component (301) is provided with a human-computer interaction part (302), the gas injection pipe (303) is arranged on the inner wall of the liquid storage tank (201), and the pressurizing component (301) and the gas injection pipe (303) are communicated.

7. The DNA ploidy staining liquid batch adding device according to claim 3, characterized by: ​ 8. The DNA ploidy staining liquid batch adding device according to claim 7, characterized in that: The pressurizing component (301) is a pressurizing pump, the gas injection pipe (303) is arranged on the upper portion of the inner wall of the liquid storage tank (201), and the gas injection pipe (303) is arranged in a loop along the inner wall of the liquid storage tank (201).

9. The DNA ploidy staining liquid batch adding device according to claim 2, characterized by: The test tube plug tray limiting mechanism (4) comprises a sliding platform (401), both sides of the sliding platform (401) are provided with sliding rails (402), and the top of the sliding platform (401) is provided with a plug tray limiting groove (403) for placing a test tube plug plate; the edge of the plug tray limiting groove (403) is provided with a correction chamfer (404).

10. The DNA ploidy staining liquid batch adding device according to claim 9, wherein: A permanent magnet (104) is arranged at the back of the inner wall of the limiting sliding groove (102), a magnetic attraction strip (405) is arranged on the back of the sliding platform (401), and the permanent magnet (104) and the magnetic attraction strip (405) can be mutually adsorbed.

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