CN212281424U

CN212281424U - Automatic loading and sealing equipment suitable for respiratory tract specimen collection

Info

Publication number: CN212281424U
Application number: CN202020309129.1U
Authority: CN
Inventors: 张春霖; 张笑凯
Original assignee: Suzhou Dianhe Medical Technology Co ltd
Current assignee: Suzhou Dianhe Medical Technology Co ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2021-01-05
Anticipated expiration: 2030-03-13

Abstract

The utility model relates to an automatic loading sealing equipment suitable for respiratory track sample collection, including the revolving stage, install the stand on the revolving stage, install pharynx swab automatic filling device on the stand, pharynx swab automatic filling device loads the below and is provided with pharynx swab automatic sealing mechanism, is provided with the automatic separator of pharynx swab between pharynx swab automatic filling device and the pharynx swab automatic sealing mechanism. Therefore, the automatic throat swab feeding device can realize the one-by-one automatic feeding of throat swabs, can realize the automatic combination of the throat swabs and sampling equipment or a robot, and does not need manual intervention. The device is provided with an independent automatic pharynx swab separating device, so that the sampled pharynx swab can be separated in a contact-free manner by aiming at conventional sampling equipment or a robot, and the sample is prevented from being polluted. Adopt pharynx swab self-sealing mechanism, can realize the quick encapsulation of pharynx swab, reduce its time that exposes in the air, avoid cross infection, and improve the safety in utilization.

Description

Automatic loading and sealing equipment suitable for respiratory tract specimen collection

Technical Field

The utility model relates to a load sealing equipment, especially relate to automatic loading sealing equipment suitable for respiratory track sample collection.

Background

In recent years, the outbreak of new coronavirus pneumonia causes great loss to China and even the world. According to the novel diagnosis and treatment scheme of the coronavirus infection pneumonia, a suspected case needs to be diagnosed with one of the following etiological evidences:

1. detecting the positive of the novel coronavirus nucleic acid by a respiratory tract specimen or a blood specimen through real-time fluorescence RT-PCR;

2. sequencing of viral genes in respiratory tract specimens or blood specimens is highly homologous to known novel coronaviruses.

Therefore, specimen collection is an essential link for accurate diagnosis of the novel coronavirus pneumonia, but the specimen collection is a high-risk and repeated operation, needs to be in close contact with a patient, can cause severe cough of the patient, splashes around during sampling processes such as cotton swabs and the like, and has extremely high infection risk. Medical personnel are at great occupational exposure because of the high infectivity and mortality associated with coronaviruses.

Meanwhile, the collection and examination of the respiratory tract specimen determine the diagnosis and discharge standards of the patient, and is an examination which has to be done.

In view of the above-mentioned drawbacks, the present designer has made active research and innovation to create an automatic filling and sealing device suitable for collecting respiratory tract specimens, so that the automatic filling and sealing device can be operated remotely or remotely, thereby improving the reliability of specimen collection, reducing or even avoiding the occupational exposure risk of medical staff, improving the safety of operation, and reducing the labor intensity.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model aims at providing an automatic loading sealing equipment suitable for respiratory track sample collection.

The utility model discloses an automatic loading sealing equipment suitable for respiratory track sample is gathered, including the revolving stage, wherein: install the stand on the revolving stage, install pharynx swab automatic filling device on the stand, pharynx swab automatic filling below is provided with pharynx swab automatic sealing mechanism, be provided with the automatic separator of pharynx swab between pharynx swab automatic filling device and the pharynx swab automatic sealing mechanism.

Further, foretell automatic filling sealing device who is applicable to respiratory track sample collection, wherein, be provided with the motor in the revolving stage, be connected with indexing mechanism on the motor.

Furthermore, foretell automatic loading sealing equipment who is applicable to respiratory track sample collection, wherein, pharynx swab automatic loading device is including the cavity crossbeam, the one end and the stand of cavity crossbeam link to each other, the other end of cavity crossbeam is provided with the pharynx swab guide rail, the one end of pharynx swab guide rail is provided with main hole of pushing out, the other end of pharynx swab guide rail is provided with first spring, a plurality of pharynx swabs of having distributed in the pharynx swab guide rail, main push out and be provided with the pharynx swab on the hole and push out the subassembly.

Further, the automatic filling and sealing device for collecting the respiratory tract specimen is characterized in that the pharynx swab pushing assembly is a pharynx swab push rod electromagnet.

Furthermore, the automatic loading and sealing device suitable for collecting the respiratory tract specimen is characterized in that the throat swab automatic sealing mechanism comprises a bottle stopper mounting hollow cross rod connected with a stand column, a guide rail is arranged in the bottle stopper mounting hollow cross rod, a bottle stopper guide rail is arranged at one end of the guide rail, the other end of the guide rail is connected with a bottle stopper position control assembly through a second spring, a plurality of bottle stopper assemblies are mounted on the bottle stopper guide rail, an auxiliary push-out hole is formed in the outer end of the bottle stopper guide rail, a bottle stopper propelling assembly is arranged at the position, located at the auxiliary push-out hole, of the bottle stopper guide rail, the throat swab automatic sealing mechanism further comprises a test tube mounting hollow cross rod connected with the stand column, a test tube propelling assembly is arranged at one end of the test tube mounting hollow cross rod, and a, a plurality of test tube assemblies are distributed on the test tube guide rail.

Furthermore, foretell automatic loading sealing device who is applicable to respiratory track sample collection, wherein, bottle plug position control subassembly is bottle plug position control push rod electro-magnet, the bottle plug impels the subassembly to impel the push rod electro-magnet for the bottle plug, the test tube impels the subassembly to be the third spring.

Furthermore, foretell be applicable to automatic loading sealing device that respiratory track sample was gathered, wherein, the test tube subassembly is including test tube body, test tube body's upper end is provided with the stair structure, the stair structure is connected with test tube guide rail looks limit.

Furthermore, the automatic loading and sealing device for collecting the respiratory tract specimen is characterized in that the automatic throat swab separating device comprises a fixing rod, an opening-closing type fixing tube is connected onto the fixing rod, and a separating and pushing-out assembly is arranged on one side of the opening-closing type fixing tube.

Furthermore, the automatic filling and sealing device suitable for collecting the respiratory tract specimen is characterized in that a guide groove is formed in the fixed rod, the opening-closing type fixed tube is installed in the guide groove, the opening of the upper end of the inner hole of the opening-closing type fixed tube is large, the opening of the lower end of the inner hole of the opening-closing type fixed tube is small, one side of the opening-closing type fixed tube is connected with the separation pushing-out assembly, and the separation pushing-out assembly is a separation pushing-rod electromagnet.

Still further, foretell be applicable to respiratory track sample collection's automatic loading sealing equipment, wherein, the automatic separator of pharynx swab is including the fixed pipe that distributes in pairs, the top of fixed pipe is provided with blocks the electro-magnet, the shape that the size is unanimous about the hole of fixed pipe is.

Borrow by above-mentioned scheme, the utility model discloses at least, have following advantage:

1. by means of the automatic loading device for the throat swabs, automatic feeding of the throat swabs one by one can be achieved, automatic combination of the throat swabs and sampling equipment or a robot can be achieved, and manual intervention is not needed.

2. The device is provided with an independent automatic pharynx swab separating device, so that the sampled pharynx swab can be separated in a contact-free manner by aiming at conventional sampling equipment or a robot, and the sample is prevented from being polluted.

3. Adopt pharynx swab self-sealing mechanism, can realize the quick encapsulation of pharynx swab, reduce its time that exposes in the air, avoid cross infection, and improve the safety in utilization.

4. The use is convenient, can cooperate manual sampling equipment or automatic sampling equipment's use, and it is efficient to load sealed, satisfies batched sampling detection.

5. The degree of automation is high, can accomplish the collection and the sealing of pharynx swab or other respiratory tract specimens of getting automatically, does not need medical staff's the participation in closely and avoids polluting, guarantees the operation safety.

The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present invention and accompanying drawings.

Drawings

Fig. 1 is a schematic side view of the automatic filling and sealing device for collecting respiratory tract specimens.

Fig. 2 is a schematic side sectional view of an automatic loading and sealing device suitable for collection of a respiratory specimen.

Fig. 3 is a schematic front view of an automatic filling and sealing device suitable for collecting airway specimens.

Fig. 4 is a schematic top view of an automatic loading and sealing apparatus suitable for collection of airway specimens.

Fig. 5 is a schematic view of the automatic pharyngeal swab detaching device in the second embodiment.

The meanings of the reference symbols in the drawings are as follows.

1 turntable and 2 upright posts

3 automatic loading device for throat swabs and 4 automatic separating device for throat swabs

6 indexing mechanism of automatic sealing mechanism for 5 throat swabs

7 hollow beam 8 throat swab guide rail

9 main push-out hole 10 first spring

11 throat swab push rod electro-magnet 12 dead lever

13 opening-closing type fixed pipe 14 separating push rod electromagnet

15 guide groove 16 inner hole

17 test tube assembly 18 stopper mounting hollow cross bar

19 bottle stopper assembly 20 bottle stopper guide rail

21 secondary spring 22 secondary push-out hole

Electromagnet for pushing 23 bottle stopper into push rod and electromagnet for controlling position of 24 bottle stopper

25 guide rail 26 test tube mounting hollow cross bar

27 test tube guide 28 third spring

29 throat swab 30 step structure

31 fixed tube 32 blocking electromagnet

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

Example one

The automatic filling and sealing device suitable for collecting respiratory tract specimens as shown in fig. 1 to 4 comprises a rotary table 1, and is characterized in that: install stand 2 on the revolving stage 1, install throat swab automatic filling device 3 on the stand 2, be convenient for realize the feed of throat swab 29. Meanwhile, in order to collect and seal the collected throat swab 29, an automatic throat swab sealing mechanism 5 is provided below the automatic throat swab loading device 3. In addition, in order to smoothly separate the throat swab 29 from the collection device or the robot, the present invention is provided with the automatic throat swab detaching device 4 between the automatic throat swab loading device 3 and the automatic throat swab sealing mechanism 5. The automatic pharynx swab separating device 4 can be connected with the upright post 2, can also form an independent device to be connected with an external matched collecting device or a robot, and particularly needs to be coordinated and assembled according to a sample collecting position, so that the pharynx swab separating device is in an overhead state in the attached drawings and aims to enable technicians in the field to know the working principle of the pharynx swab separating device.

In combination with the preferred embodiment of the present invention, in order to provide the driving of the circumferential rotation, a motor is provided in the turntable 1, and the indexing mechanism 6 is connected to the motor. Therefore, the patient can rotate a certain angle, and the patient can conveniently go up and down the examination table. At the same time, the position of the throat swab holding tube preset by the corresponding device can be precisely aligned during use. This ensures that the pharyngeal swab 29 is brought into the correct collection position.

Further, in order to satisfy the effective automatic filling and the automatic supply of the prepared materials, the automatic throat swab filling device 3 is selected to include a hollow beam 7. Specifically, one end of the hollow beam 7 is connected to the upright 2, and the other end of the hollow beam 7 is provided with a throat swab guide 8. A plurality of throat swabs 29 are distributed within the throat swab guide 8. Meanwhile, in consideration of smooth discharge of the throat swab 29, one end of the throat swab guide 8 is provided with a main push-out hole 9. In connection with practical use, usually the main ejection hole 9 is located outside the pharyngeal swab guide 8, and the pharyngeal swab ejection assembly is provided on the main ejection hole 9. This facilitates the push out of the pharyngeal swab 29 for connection to an external collection device. The robot can be matched with the corresponding acquisition robot provided by the applicant, so that the intervention of medical personnel is reduced. In order to allow for the forward filling of further pharyngeal swabs 29 after one pharyngeal swab 29 has been ejected, a first spring 10 is provided at the other end of the pharyngeal swab guide 8. In view of the convenience of the push-out control, the utility model discloses a pharynx swab push-out component is pharynx swab push-rod electro-magnet 11.

Still further, to effect a seal on a sampled pharyngeal swab 29, the automatic pharyngeal swab sealing mechanism 5 includes a stopper-mounted hollow cross-bar 18 connected to the post 2. Guide rails 25 are provided within the stopper-mounting hollow cross bar 18 for smooth alignment of the subsequent stopper assembly 19 and to provide proper forward guidance. Specifically, one end of the guide rail 25 is provided with a stopper guide rail 20, the other end of the guide rail 25 is connected with a stopper position control assembly through a second spring 21, and a plurality of stopper assemblies 19 are mounted on the stopper guide rail 20. Meanwhile, in order to satisfy the smooth pushing out of the bottle stopper assembly 19, the outer end of the bottle stopper guide rail 20 is provided with an auxiliary pushing-out hole 22, and the bottle stopper guide rail 20 is provided with a bottle stopper pushing assembly at the position of the auxiliary pushing-out hole 22. In the original state, the stopper assembly 19 does not shield the falling track of the throat swab 29, and the throat swab 29 is ensured to smoothly fall into the test tube assembly 17.

Meanwhile, in order to realize the collection and the accommodation of the sampled throat swab 29, the throat swab automatic sealing mechanism 5 also comprises a test tube mounting hollow cross rod 26 connected with the upright post 2. Specifically, one end of the test tube mounting hollow cross bar 26 is provided with a test tube advancing assembly, which is a third spring 28. The other end of the test tube mounting hollow cross bar 26 is provided with a test tube guide rail 27. And, a plurality of test tube assemblies 17 are distributed on the test tube guide rail 27. Thus, the collection and placement corresponding to the pharyngeal swab 29 can be realized, and the combination of the bottle stopper assembly 19 and the test tube assembly 17 can be realized under the cooperation of the bottle stopper propelling assembly, so that the pharyngeal swab 29 can be hermetically collected. In view of practical implementation, in order to realize automatic collection without manual intervention, the bottle stopper position control component is a bottle stopper position control push rod electromagnet 24, and the bottle stopper pushing component is a bottle stopper pushing push rod electromagnet 23. In this way sequential advancement of the stopper assembly 19 is achieved and pushed down for engagement as required. Furthermore, in order to realize the stable placing of test tube subassembly 17, the utility model discloses a test tube subassembly 17 including test tube body, test tube body's upper end is provided with step structure 30, and step structure 30 and test tube guide rail 27 limit for a limit mutually are connected.

In view of practical use, in order to ensure the smooth collection of the pharyngeal swab 29 connected to the external collecting device, the automatic pharyngeal swab detachment device 4 is used comprising a fixing rod 12, which fixing rod 12 can be connected to the external collecting device or to his auxiliary positioning component of the robot. Meanwhile, in order to guide the throat swab 29 to smoothly fall off, an openable fixing tube 13 is connected to the fixing rod 12, and a separation pushing-out member is provided on one side of the openable fixing tube 13.

In addition, in consideration of stable installation of the open/close type fixing tube 13, the fixing rod 12 is provided with a guide groove 15, and the open/close type fixing tube 13 is installed in the guide groove 15. Specifically, the inner hole 16 of the opening-closing type fixed tube 13 has a shape with a large upper end opening and a small lower end opening, so that effective falling control is realized, and the influence of gravity on too fast falling of the throat swab 29 to influence subsequent matched collection is avoided. Meanwhile, one side of the opening-closing type fixed pipe 13 is connected with a separation pushing-out component which is a separation push rod electromagnet 14. During use, the push rod movement away from the push rod electromagnet 14 separates the fixed tube 13 and the throat swab 29 automatically drops into the test tube assembly 17 below.

Example two

The automatic filling and sealing device suitable for collecting respiratory tract specimens as shown in fig. 1 to 5 comprises a rotary table 1, and is characterized in that: install stand 2 on the revolving stage 1, install throat swab automatic filling device 3 on the stand 2, be convenient for realize the feed of throat swab 29. Meanwhile, in order to collect and seal the collected throat swab 29, an automatic throat swab sealing mechanism 5 is provided below the automatic throat swab loading device 3. In addition, in order to smoothly separate the throat swab 29 from the collection device or the robot, the present invention is provided with the automatic throat swab detaching device 4 between the automatic throat swab loading device 3 and the automatic throat swab sealing mechanism 5. The automatic pharynx swab separating device 4 can be connected with the upright post 2, can also form an independent device to be connected with an external matched collecting device or a robot, and particularly needs to be coordinated and assembled according to a sample collecting position, so that the pharynx swab separating device is in an overhead state in the attached drawings and aims to enable technicians in the field to know the working principle of the pharynx swab separating device.

As shown in figure 5, in order to ensure the smooth collection of the pharyngeal swab 29 connected to the external collecting equipment in combination with the practical use, the automatic pharyngeal swab detaching device 4 comprises fixed tubes 31 distributed in pairs, and a blocking electromagnet 32 is arranged at the top of the fixed tubes 31. Specifically, the inner hole of the fixed pipe 31 has a shape with a uniform vertical size.

When the blocking electromagnet 32 works, the push rod can be extended out of the upper part of the fixed tube 31, so that the pharynx swab 2 is effectively controlled to fall, and the situation that the pharynx swab 29 falls too fast due to the influence of gravity to influence subsequent matched collection is avoided. After the throat swab 29 finishes collecting the sample, the push rod of the electromagnet 32 is blocked to retract, and the throat swab 29 automatically falls into the test tube assembly 17 below.

The working principle of the utility model is as follows:

can cooperate the collection robot to use, will the utility model discloses adjust to the position that corresponds. The push rod electromagnet 11 works to extrude the throat swab 29 from the self-pushing hole 9 and fall into the inner hole 16 of the open-close type fixed tube 13, and the throat swab 29 contacts the rear wall of the pharynx under the control of the corresponding collection robot to finish the collection of the upper respiratory tract specimen. Subsequently, the stopper position control push rod electromagnet 24 performs the reset operation. Thereby, the stopper assembly 19 is moved to just above the test tube assembly 17. Along with the work of the plug pushing push rod electromagnet 23, the plug assembly 19 is pushed into the tube assembly 17 to realize the automatic sealing of the sample.

Therefore, the collection and sealing of the pharyngeal swab or other respiratory tract samples can be automatically completed in the process under the cooperative work of the control system and the software, the pollution is avoided without the close participation of medical staff, and the operation safety is ensured.

Through foretell expression of characters and combination of the attached drawing can be seen, adopt the utility model discloses afterwards, possess following advantage:

Furthermore, the indication directions or positional relationships described in the present invention are directions or positional relationships based on the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the indicated device or structure must have a specific direction or operate in a specific directional configuration, and therefore, should not be construed as limiting the present invention.

The terms "primary" and "secondary" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "primary" or "secondary" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

Also, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "disposed" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, and the two components can be communicated with each other or mutually interacted. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. And it may be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the device or component so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. Automatic loading sealing device suitable for respiratory track sample is gathered, including revolving stage (1), its characterized in that: install stand (2) on revolving stage (1), install pharynx swab automatic filling device (3) on stand (2), pharynx swab automatic filling device (3) below is provided with pharynx swab automatic sealing mechanism (5), be provided with between pharynx swab automatic filling device (3) and pharynx swab automatic sealing mechanism (5) automatic separation device (4) of pharynx swab.

2. The self-priming sealing device suitable for use in the collection of respiratory specimens according to claim 1, wherein: a motor is arranged in the rotary table (1), and an indexing mechanism (6) is connected to the motor.

3. The self-priming sealing device suitable for use in the collection of respiratory specimens according to claim 1, wherein: pharynx swab automatic filling device (3) is including cavity crossbeam (7), the one end of cavity crossbeam (7) links to each other with stand (2), the other end of cavity crossbeam (7) is provided with pharynx swab guide rail (8), the one end of pharynx swab guide rail (8) is provided with the owner and pushes away a hole (9), the other end of pharynx swab guide rail (8) is provided with first spring (10), it has a plurality of pharynx swabs (29) to distribute in pharynx swab guide rail (8), it pushes out the subassembly to be provided with the pharynx swab on hole (9) to push away mainly.

4. The self-priming sealing device suitable for use in the collection of respiratory specimens according to claim 3, wherein: the pharynx swab pushing-out component is a pharynx swab push rod electromagnet (11).

5. The self-priming sealing device suitable for use in the collection of respiratory specimens according to claim 1, wherein: the pharynx swab automatic sealing mechanism (5) comprises a bottle stopper installation hollow cross rod (18) connected with a stand column (2), a guide rail (25) is arranged in the bottle stopper installation hollow cross rod (18), a bottle stopper guide rail (20) is arranged at one end of the guide rail (25), the other end of the guide rail (25) is connected with a bottle stopper position control assembly through a second spring (21), a plurality of bottle stopper assemblies (19) are installed on the bottle stopper guide rail (20), an auxiliary push hole (22) is formed in the outer end of the bottle stopper guide rail (20), a bottle stopper propelling assembly is arranged at the position, located in the auxiliary push hole (22), of the bottle stopper guide rail (20), the pharynx swab automatic sealing mechanism (5) further comprises a test tube installation hollow cross rod (26) connected with the stand column (2), and a test tube propelling assembly is arranged at one end of the test tube installation hollow cross rod (, the other end of test tube installation cavity horizontal pole (26) is provided with test tube guide rail (27), it has a plurality of test tube subassembly (17) to distribute on test tube guide rail (27).

6. The self-priming sealing device suitable for use in the collection of respiratory specimens according to claim 5, wherein: the bottle stopper position control assembly is a bottle stopper position control push rod electromagnet (24), the bottle stopper propelling assembly is a bottle stopper propelling push rod electromagnet (23), and the test tube propelling assembly is a third spring (28).

7. The self-priming sealing device suitable for use in the collection of respiratory specimens according to claim 5, wherein: test tube subassembly (17) is including test tube body, test tube body's upper end is provided with step structure (30), step structure (30) and test tube guide rail (27) are limit connection mutually.

8. The self-priming sealing device suitable for use in the collection of respiratory specimens according to claim 1, wherein: the automatic throat swab separating device (4) comprises a fixing rod (12), an opening-closing type fixing tube (13) is connected onto the fixing rod (12), and a separating and pushing-out assembly is arranged on one side of the opening-closing type fixing tube (13).

9. The self-priming sealing device suitable for use in the collection of respiratory specimens according to claim 8, wherein: the fixing rod (12) is provided with a guide groove (15), the opening-closing type fixing tube (13) is installed in the guide groove (15), the opening of the upper end of an inner hole (16) of the opening-closing type fixing tube (13) is large, the opening of the lower end of the inner hole is small, one side of the opening-closing type fixing tube (13) is connected with the separation pushing-out assembly, and the separation pushing-out assembly is a separation push rod electromagnet (14).

10. The self-priming sealing device suitable for use in the collection of respiratory specimens according to claim 1, wherein: the automatic pharynx swab disengaging device (4) comprises fixed tubes (31) distributed in pairs, blocking electromagnets (32) are arranged at the tops of the fixed tubes (31), and inner holes of the fixed tubes (31) are in the shape of the same size from top to bottom.