Dynamic plate method sampling frame for air bacteria

Abstract

The utility model discloses a dynamic plate method sampling rack for air bacteria in the technical field of sampling equipment, which comprises a supporting seat, a frame, a positioning rod and a storage box, the supporting seat is a stable base with a flat bottom, a supporting rod is vertically arranged at the top of the supporting seat, a reinforcing frame is arranged at the top of the supporting rod, and the storage box is arranged on the frame. The frame is obliquely and stably erected on the reinforcing frame with the front portion lower than the rear portion, the frame can be horizontally and transversely adjusted on the frame through the positioning rods so as to adapt to various return air inlets of different sizes, and culture dishes can be conveniently adjusted to the middle horizontal height positions of the return air inlets through height adjustment of the supporting rods; the distance between the culture dish and the air return port can be conveniently positioned, the horizontal spacing position does not need to be measured, operation steps are reduced, the culture dish can reach a standard measurement posture after installation is completed, walking and activities of personnel are reduced, and air pollution caused by extra operation and walking of sampling personnel in an operating room is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sampling equipment, in particular to an air bacteria dynamic plate method sampling rack. Background Technique

[0002] The clean operating department of medical institutions is an important place for surgical treatment and one of the key departments for hospital infection management. Industry guidelines stipulate that the number of personnel and their movement should be minimized during surgery. Excessive number of personnel and frequent walking during surgery will reduce the air cleanliness of the operating room, and the airborne bacteria count during surgery is positively correlated with the incidence of surgical site infections. The industry guidelines for the clean operating department of medical institutions stipulate that the airborne bacteria concentration in the clean operating rooms of hospitals during surgery needs to be monitored and evaluated in a timely manner to understand whether the airborne bacteria count during surgery meets the requirements of the guidelines. Standardized and convenient monitoring of the airborne bacteria concentration in the clean operating room can provide reliable data for the prevention and control management of surgical site infections, improve the management effect, and ensure the safety of patients.

[0003] The dynamic plate method for the air at the return air outlet of the operating room stipulated by the industry guidelines is to evenly place 3 culture dishes with a diameter of 90 mm at the middle height position of each return air outlet. The culture dishes are 50 mm away from the return air outlet and are placed at an angle of 30° to the ground plane with their backs to the return air outlet, and left standing for 30 minutes. After sampling, they should be sent for inspection in a timely manner.

[0004] The national standard has clear requirements for the height of the return air outlet of the operating department, stipulating that the upper edge height of the lower return air outlet should not exceed 0.5 meters from the ground, and the clearance between the lower edge of the opening and the ground should not be less than 0.1 meter. The number and length of the return air outlets in clean operating rooms of different grades are different. Usually, there are 8 return air outlets in Class I clean operating rooms, and the horizontal length of each is about 0.98 m; there are 4 return air outlets in Class II clean operating rooms, and the horizontal length of each return air outlet is about 0.72 m, and there are also differences in the height positions of the return air outlets. This results in different requirements for the number, length, and height of the brackets for monitoring the airborne bacteria in different operating rooms, and at the same time, the corresponding number of sampling culture dishes is also different. Moreover, during sampling, the culture dishes should be prevented from being contaminated by the external environment. In order to obtain standard samples and ensure the accuracy of the results, higher requirements are imposed on the sampling brackets.

[0005] The current sampling rack is usually a relatively large support rack, which is inconvenient to place. In order to adapt to the size of the return air outlet, it has a large wingspan and large volume, resulting in inconvenience in handling and carrying. During the sampling process, it occupies too much space; its height is fixed, and a sampling rack with a corresponding height needs to be customized according to the height position in the middle of the return air outlet of the clean operating department of the medical institution where it is located; when placing the sampling rack, measurements are required, and the sampling rack needs to be frequently adjusted to be parallel to the wall of the return air outlet. Moreover, an accurate distance of 50 mm needs to be maintained between all petri dishes and the wall, and the erection angle of the petri dishes needs to be adjusted to 30°. The position adjustment steps are cumbersome; at the beginning of sampling, the sampling rack and petri dishes are carried into the operating room in multiple batches. First, the sampling rack is set up, and then the petri dishes are carried and placed on each sampling rack. After sampling, the sampling rack and petri dishes are evacuated from the operating room in multiple batches. First, the petri dishes are collected, and then the sampling racks are evacuated one by one. This increases the flow of people and the frequency of back-and-forth movement of the sampling personnel during the operation; for the lids of the petri dishes during sampling, sterile towels need to be prepared additionally and placed in a relatively clean place, or the area of the support rack for placing the petri dishes on the sampling rack is designed to be larger to accommodate the lids of the petri dishes. However, this will cause too much blockage of the return air outlet area, affecting the smooth discharge of gas during the operation, disturbing the internal air flow of the operating room, and affecting the air cleanliness of the operating room. During intraoperative sampling, the sampling rack needs to be lightweight and portable, avoid blocking too much of the return air outlet area, be height-adjustable, not require special customization, and be able to quickly and accurately position without repeatedly using a ruler to measure the distance between the sampling rack and the wall of the return air outlet and adjust the parallelism. During the sampling process, the sampling rack and petri dishes are carried into the operating room at the same time. The placement of the sampling rack and the placement of the petri dishes should be carried out smoothly and synchronously before and after. There should also be a relatively clean place to place the lids of the petri dishes. After sampling, the petri dishes need to be loaded into a special container, and the sampling rack and petri dishes are evacuated from the operating room at the same time, reducing the flow of people and the frequency of back-and-forth movement of the sampling personnel during the operation, and ensuring the accuracy and reliability of the monitoring results. During the sampling process, it is necessary to ensure standardized sampling to ensure the accuracy of the monitoring results, and at the same time not affect the operation and ensure the safety of the patient. These are conditions that the existing sampling racks cannot meet simultaneously.

[0006] Based on this, the present utility model designs an air bacteria dynamic plate method sampling rack to solve the above problems. Content of the utility model

[0007] The purpose of the present utility model is to provide an air bacteria dynamic plate method sampling rack, which can carry the culture dish and the sampling rack into the operating room simultaneously through a storage box. The placement of the sampling rack and the placement of the culture dish are carried out smoothly and synchronously before and after. At the same time, a relatively clean environment is provided to place the culture dish lid during the sampling process, effectively avoiding the contamination of the culture dish lid. After the sampling is completed, the culture dish has a dedicated space for loading, and the sampling rack and the culture dish are evacuated from the operating room simultaneously, greatly simplifying the operation process and reducing the number of times of personnel walking back and forth. The positioning rod is horizontally adjusted on the frame to adapt to return air outlets of various different sizes. The height of the support rod can also be adjusted so that the culture dish can be conveniently adjusted to the middle height position of the return air outlet. A limit rod is also added, which can conveniently and quickly and accurately position the distance between the culture dish and the return air outlet, and there is no need to measure the horizontal spacing position. Moreover, the inclination angle of the frame is pre-adjusted to the standard measurement inclination angle. When using this device, only need to place the culture dish on the positioning frame and limit it through the clamping rod, without the need for repeated adjustment and measurement operations, reducing the operation steps. After installation, the culture dish can reach the standard measurement posture, and the personnel walking and activities are reduced, effectively reducing the air pollution caused by additional operations and walking of personnel during the operation.

[0008] The present utility model is realized as follows: An air bacteria dynamic plate method sampling rack, comprising:

[0009] A support base, a frame, a positioning rod and a storage box;

[0010] The support base is a stable base with a flat bottom. A support rod is vertically arranged on the top of the support base, and a strengthening frame is arranged on the top of the support rod;

[0011] The frame is a rectangular frame structure composed of two cross bars and two longitudinal bars. The longitudinal bars are connected to the left and right ends of the cross bars, and the cross bars are horizontally arranged;

[0012] Strengthening frames are also arranged at the bottoms of the two cross bars. The strengthening frames are connected between the midpoints of the two cross bars. The frame is stably erected on the strengthening frame in a front-low and rear-high inclined manner;

[0013] A limit rod is arranged on each of the left and right sides of the top cross bar of the frame. The limit rods on the left and right sides are of the same length, and the limit rods extend horizontally backward on the top of the cross bar;

[0014] The positioning frame is an integral H-shaped frame structure composed of two positioning rods and a connecting plate. The positioning rods are straight rods, and a buckle is provided at each of the upper and lower ends of each positioning rod. The positioning rods can be detachably buckled between the two cross bars through the buckles, and the buckles are horizontally slid on the cross bars; every two positioning rods are vertically arranged on the left and right sides of the connecting plate. The connecting plate is a long strip-shaped flat plate, and the positioning rods are straight rods; a positioning rod is also provided at the top of the lower end of each positioning rod, and the positioning rod protrudes vertically upward on the positioning rod;

[0015] The storage box is a box with an open top. The top of the storage box is connected with a cover plate through a hinge. The cover plate can be turned over to cover the open top of the storage box, and a handle is provided on the top of the cover plate;

[0016] A storage box is provided on each of the left and right sides of the support seat. The support seat and the storage boxes on the left and right sides are of an integral structure, and the bottom of the support seat and the storage boxes is a complete plane.

[0017] The beneficial effects of the present utility model are as follows: 1. The present utility model adds a support rod, which can adjust the height position of the frame, so as to conveniently cooperate with the air return openings of the operating departments at different height positions. In addition, the positioning rods of the H-shaped structure can be slidably matched with the frame and can also be disassembled, making it more convenient to adjust the horizontal position of the positioning rods, so as to meet the requirement of evenly placing culture dishes in front of air return openings of different lengths and sizes, which brings convenience to detection;

[0018] 2. The frame is pre-fixed at an angle of 30°. With such a structure, during detection, it is only necessary to stably place the culture dish on the H-shaped frame, which is convenient for placing the posture of the culture dish, and there is no need to adjust and measure the inclination angle anymore. In addition, a limiting rod is provided, and through the two limiting rods, the 3 culture dishes on the H-shaped frame can be quickly and accurately positioned with the air return opening, which not only simplifies the operation steps but also ensures the accuracy of monitoring;

[0019] 3. The frame adopts a hollowed-out frame structure. During sampling, it is light and convenient to carry, and can greatly reduce the area of blocking the air return opening, thereby reducing the influence on the smooth discharge of intraoperative gas, reducing the disturbance of the internal air flow in the operating room, and avoiding affecting the air cleanliness of the operating room to the greatest extent.

[0020] 4. The device is also provided with a storage box, which can protect and store the culture dish. The storage box carries the culture dish and the sampling rack into the operating room at the same time. The placement of the sampling rack and the culture dish is synchronized and smooth before and after. At the same time, a relatively clean environment is provided to place the lid of the culture dish during the sampling process, effectively avoiding the contamination of the lid of the culture dish. After the sampling is completed, the culture dish has a dedicated space for loading. The sampling rack and the culture dish are withdrawn from the operating room at the same time, greatly simplifying the operation process, reducing the number of times of personnel walking back and forth, ensuring the accuracy and reliability of the monitoring results, and effectively reducing the impact of the sampling personnel on the intraoperative air pollution. Description of the Drawings

[0021] The present utility model will be further described below with reference to the accompanying drawings in conjunction with embodiments.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0023] Figure 2 It is a schematic diagram of the side structure of the present utility model;

[0024] Figure 3 It is a schematic diagram of the side structure of the positioning rod of the present utility model;

[0025] Figure 4 It is a schematic diagram of the structure of the storage box of the present utility model.

[0026] In the drawings, the list of components represented by each reference numeral is as follows:

[0027] 1 - support base, 11 - support rod, 12 - reinforcing frame, 2 - frame, 21 - limiting rod, 22 - longitudinal rod, 23 - cross rod, 3 - positioning rod, 31 - clamping rod, 32 - buckle, 33 - connecting plate, 4 - storage box, 41 - cover plate, 42 - handle. Detailed Embodiment

[0028] Please refer to Figures 1 to 4 As shown, the present utility model provides an air bacteria dynamic plate method sampling rack. In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the specification drawings and specific embodiments.

[0029] In a specific embodiment of the technical solution of the present utility model:

[0030] It includes a support base 1, a frame 2, a positioning rod 34 and a storage box 4;

[0031] The support base 1 is a stable base with a flat bottom. A support rod 11 is vertically arranged on the top of the support base 1, and a strengthening frame 12 is arranged on the top of the support rod 11. A counterweight is arranged inside the support base 1. The support rod 11 is a telescopic rod, which can be a manually adjustable telescopic rod locked by a buckle. The support rod 11 is adjusted by tightening and loosening the hoop. The top and bottom of the support rod 11 are respectively locked with the strengthening frame 12 and the support base 1 by threads, which is convenient for disassembly, assembly and carrying.

[0032] The frame 2 is a rectangular frame structure composed of two cross bars 23 and two longitudinal bars 22. The longitudinal bars 22 are connected to the left and right ends of the cross bar 23, and the cross bar 23 is horizontally arranged. The cross bars of the frame 2 are kept horizontally arranged, while the connecting rod 22 is inclined with the front end lower and the rear end higher. In this way, the plane where the frame 2 is located can be inclined to face the wind. The frame 2 adopts a hollow frame structure, which is light and convenient to carry during sampling. It can also greatly reduce the area blocking the air return port, thereby reducing the influence on the smooth discharge of intraoperative gas and disturbing the internal air flow in the operating room less, and avoiding affecting the air cleanliness in the operating room to the greatest extent.

[0033] Strengthening frames 12 are also arranged at the bottoms of the two cross bars 23. The strengthening frames 12 are connected between the midpoints of the two cross bars 23. Such a structure makes the vertical plane where the strengthening frames 12 are located parallel to the connecting rods 22 on the left and right sides. The frame 2 with the front end lower and the rear end higher is stably erected on the strengthening frames 12. The strengthening frames 12 and the frame 2 can be an integral structure formed by welding, and the strengthening frames 12 are locked with the tops of the support rods 11 by threads. It can be assembled before use, which is convenient for storage and carrying.

[0034] Limit rods 21 are arranged on the left and right sides of the top cross bar 23 of the frame 2. The limit rods 21 on the left and right sides have the same length. The limit rods 21 extend horizontally backward on the top of the cross bar 23, so that the rear ends of the two limit rods 21 are in the same vertical plane. A grid for buffering air flow in a fence shape is arranged on the air return port. By abutting the limit rods 21 against the grid on the air return port, it only needs to touch gently, which is convenient for positioning the air return port by abutting. When the two limit rods 21 abut against the air return port, the upper and lower cross bars of the frame 2 are parallel to the vertical plane of the air return port. The included angle a between the plane where the frame 2 is located and the horizontal ground is 30°. A longitudinal bar 22 is also arranged between the upper and lower long rods of the frame 2, and the longitudinal bar 22 supports the left and right ends of the frame 2.

[0035] The limit rod 21 is perpendicular to the upper cross bar 23 in the horizontal plane, and the length of the limit rod 21 is 50 mm. The size of the limit rod 21 is preset, and the culture dish can be stably erected 50 mm away from the wall. It can make the upper tangent of the culture dish be 50 mm away from the air return port, which can meet the requirements of the horizontal spacing of air sampling points. The operation is more convenient. There is no need to measure, and only the limit rod 21 needs to be abutted against the wall for positioning.

[0036] At each of the upper and lower ends of each positioning rod 34, a buckle 32 is provided. The positioning rod 34 can be detachably buckled between two cross bars 23 through the buckle 32, and the buckle 32 is horizontally slidably arranged on the cross bar 23; the buckle 32 is a U-shaped buckle with an open back, and the buckle 32 can be detachably buckled on the horizontal cross bars on the upper and lower sides of the frame 2 through the opening on the back;

[0037] A magnet is also provided inside the arc of the buckle 32, and each buckle 32 is stably adsorbed on the horizontal cross bars on the upper and lower sides of the frame 2 through the magnet. The buckle 32 can be a PVC buckle. Because its back is open and has a certain elasticity, the buckle 32 can open and snap onto the cross bar 23, and the buckle 32 can also horizontally slide on the cross bar 23. A magnet block is embedded in the concave surface of the buckle 32, which can magnetically adsorb the buckle 32 on the cross bar 23 to ensure stable position and not easy to slide. It can only be adjusted manually, is convenient to use, and the sampling is stable.

[0038] The positioning frame 3 is an integral H-shaped frame structure composed of two positioning rods 34 and a connecting plate 33. The positioning rods 34 are straight rods. At each of the upper and lower ends of each positioning rod 34, a buckle 32 is provided. The positioning rod 34 can be detachably buckled between two cross bars 23 through the buckle 32, and the buckle 32 is horizontally slidably arranged on the cross bar 23; every two positioning rods 34 are vertically arranged on the left and right sides of the connecting plate 33. The connecting plate 33 is a long strip-shaped flat plate, and the positioning rods 34 are straight rods; a positioning rod 31 is also provided at the lower end of each positioning rod 34. The positioning rod 31 protrudes vertically upward on the positioning rod 34, and the two positioning rods 31 are symmetric left and right; the setting position of the positioning rod 31 at the lower end of the positioning rod 34 should be such that the culture dish is placed obliquely on the positioning frame, and the highest edge point of the culture dish is tangent to the outer edge line of the upper cross bar 23. The top of the connecting plate 33 is covered with a rubber anti-slip layer; moreover, the top of the connecting plate 33 is covered with a rubber anti-slip sheet, which can have an anti-slip effect to ensure stable erection of the culture dish. The positioning rod 34 and the positioning rod 31 are perpendicular to each other, the positioning rod 31 is perpendicular to the plane of the frame 3 of the positioning frame, and the horizontal distance d between the two positioning rods 31 on the same positioning frame 3 is about 80 mm. Because the diameter of the culture dish is 90 mm, and 80 mm can stably ensure that the culture dish is clamped and limited, and the positioning rod 31 can be clamped with the circular culture dish to prevent the culture dish from falling due to inclination.

[0039] The storage box 4 is a box with an open top. The top of the storage box 4 is connected to a cover plate 41 through a hinge. The cover plate 41 can be turned over to cover the open top of the storage box 4, and a handle 42 is provided on the top of the cover plate 41;

[0040] A storage box 4 is provided on each of the left and right sides of the support base 1. The support base 1 and the storage boxes 4 on the left and right sides are of an integral structure, and the bottom of the support base 1 and the storage box 4 is a complete plane. The inside of the storage box 4 can be multiple mutually isolated storage slots, which are convenient for storing culture dishes and culture dish lids.

[0041] When the utility model is sampling, before sampling, the support rod 11 and the strengthening frame 12 are assembled. The grid frame 2 is stably locked at the top of the support rod 11 in an inclined state. The support rod 11 is stably installed on the top of the support base 1. The buckles 32 of the three positioning frames 3 are buckled between the two cross bars 23. One of the positioning frames 3 should be installed at the exact middle position of the strengthening frame 12, and the remaining positioning frames 3 are installed one on each side of the strengthening frame 12. After disinfecting the device, three culture dishes are placed in the storage box 4 and ensured to be stuck in the card slots.

[0042] During the operation, the prepared sampling rack as a whole is brought into the operating room. One set of sampling rack is placed at each air return opening. According to the height position in the middle of the air return opening, the height of the support rod 11 is adjusted so that the frame 2 is at the middle height position of the air return opening.

[0043] Cooperate with the limit rods 21 and make the two limit rods 21 align with the wall surface of the air return opening at a 90° angle. By abutting the two limit rods 21 on both sides against the air return opening, the two cross bars 23 are made parallel to the wall. The strengthening frame 12 is installed at the horizontal midpoint position of the air return opening. At this time, the middle positioning frame 3 is at the middle of the air return opening.

[0044] Then, according to the length of the air return opening, the positioning frames 3 on the left and right sides are slid so that the three positioning frames 3 are evenly distributed at the middle height and horizontal position of the air return opening. Then, the culture dishes are taken out from the storage box 4 and placed on the positioning frames 3. Since the frame 2 is inclined at an angle of 30° away from the air return opening, the culture dishes will also be inclined at an angle of 30° away from the air return opening. At this time, the lids of the culture dishes are not opened.

[0045] When it reaches the sampling time point, according to the sampling rules, the lids of the culture dishes are opened in sequence, and the lids of the culture dishes are placed upside down in the storage box 4.

[0046] After the culture dishes are left standing for 30 minutes, the lids of the culture dishes are taken out from the storage box 4 in sequence according to the sampling rules, covered back on each culture dish, the culture dishes are marked, and then put back into the storage box 4 and ensured to be stably placed. With such a structure, for an operating room with only 4 air return openings, the sampling personnel can carry two sets of sampling racks in each hand, and only need to enter and exit the operating room once each, minimizing the number of times of entering and exiting the operating room to the greatest extent, ensuring both the sampling standard and accuracy, greatly reducing the impact of the sampling operation on the intraoperative environment, reducing air pollution, and reducing the infection risk of patients during the operation.

[0047] The front side of this device refers to Figure 1On the front side, the back side refers to the side facing the wall where the limiting rod 21 abuts, and the left and right sides refer to the left and right sides in the front-back direction. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0048] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments we described are illustrative rather than used to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered by the scope protected by the claims of the present invention.

Claims

1. An air bacteria dynamic plate method sampling rack, characterized in that: include: Support base (1), frame (2), positioning frame (3) and storage box (4); The support seat (1) is a stable base with a flat bottom, a support rod (11) is vertically arranged on the top of the support seat (1), and a reinforcement frame (12) is arranged on the top of the support rod (11); The frame (2) is a rectangular frame structure composed of two cross bars (23) and two longitudinal bars (22), wherein the longitudinal bars (22) are connected to the left and right ends of the cross bars (23), and the cross bars (23) are arranged horizontally; A reinforcing frame (12) is also provided at the bottom of the two cross bars (23), the reinforcing frame (12) is connected between the midpoints of the two cross bars (23), and the frame (2) is stably erected on the reinforcing frame (12) with the front lower and the rear higher tilted; A limit rod (21) is arranged on both the left and right sides of the top cross bar (23) of the frame (2), the limit rods (21) on the left and right sides have the same length, and the limit rod (21) extends horizontally backward and is arranged on the top of the cross bar (23); The positioning frame (3) is an integral H-shaped frame structure composed of two positioning rods (34) and a connecting plate (33); the positioning rods (34) are straight rods; each positioning rod (34) is provided with a buckle (32) at both ends; the positioning rod (34) can be detachably buckled between two cross bars (23) through the buckle (32); the buckle (32) is horizontally slidably arranged on the cross bar (23); every two positioning rods (34) are vertically arranged on the left and right sides of the connecting plate (33); the connecting plate (33) is a long strip-shaped flat plate; the positioning rods (34) are straight rods; a positioning rod (31) is also provided at the top of the lower end of each positioning rod (34); the positioning rod (31) protrudes vertically upward on the positioning rod (34); The storage box (4) is a box with an opening at the top. The top of the storage box (4) is connected to a cover plate (41) via a hinge. The cover plate (41) can be flipped open to cover the top opening of the storage box (4). A handle (42) is provided on the top of the cover plate (41). A storage box (4) is arranged on each of the left and right sides of the support base (1); the support base (1) and the storage boxes (4) on the left and right sides are an integral structure; the bottom of the support base (1) and the storage boxes (4) are a complete plane; A longitudinal rod (22) is also provided between the upper and lower long rods of the frame (2), and the longitudinal rod (22) is supported at the left and right ends of the frame (2); The limiting rod (21) and the upper crossbar (23) are perpendicular to each other on a horizontal plane, the positioning rod (34) and the locking rod (31) are perpendicular to each other, and the locking rod (31) is perpendicular to the plane where the positioning frame (3) is located.

2. The air bacteria dynamic plate method sampling rack according to claim 1, characterized in that: The angle a between the plane where the frame (2) is located and the horizontal plane is 30°, and the length of the limiting rod (21) is 50 mm.

3. The air bacteria dynamic plate method sampling rack according to claim 1, characterized in that: A counterweight block is arranged inside the support seat (1), and the support rod (11) is a telescopic rod.

4. The air bacteria dynamic plate method sampling rack according to claim 1, characterized in that: The top of the connecting plate (33) is covered with a rubber anti-slip layer; The horizontal distance d between the two positioning rods (31) on the same positioning frame (3) does not exceed 80 mm.

5. The air bacteria dynamic plate method sampling rack according to claim 1, characterized in that: The buckle (32) is a U-shaped buckle with an opening at the back, and the buckle (32) can be detachably buckled onto the horizontal cross bars at the upper and lower sides of the frame (2) through the opening at the back; A magnet is also provided inside the arc of the buckle (32), and each of the buckles (32) is stably adsorbed to the horizontal cross bars on the upper and lower sides of the frame (2) through the magnet.

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