Air exhaust suspension arm and hoisting system for physicochemical and biological laboratory

Abstract

The utility model provides an air exhaust suspension arm and a physical, chemical and biological laboratory hoisting system, and relates to the technical field of laboratory appliances, the air exhaust suspension arm provided by the utility model comprises an air exhaust pipe group, a telescopic mechanism and a plurality of lifting sections which are sequentially arranged along the vertical direction, and any two adjacent lifting sections are in sliding fit along the vertical direction; one end of the telescopic mechanism is connected with the lifting section at the topmost end, and the other end is connected with the lifting section at the bottommost end; the exhaust pipe set is provided with a telescopic part and a swing part communicated with the telescopic part, one end of the telescopic part is connected with the lifting section at the topmost end, the other end of the telescopic part is connected with the lifting section at the bottommost end, the swing part is located outside the multiple lifting sections and rotationally connected with the bottom end of the telescopic part, and the rotating axis of the swing part is perpendicular to the vertical direction. One end of the swing part away from the telescopic part is provided with an extraction opening. According to the air exhaust suspension arm, the length size of the air exhaust suspension arm can be adjusted in the vertical direction while air generated in the experiment process is extracted, and sight lines of students in the back row are not prone to being blocked.

Description

Technical Field

[0001] The utility model relates to the technical field of laboratory appliances, in particular to an air extraction suspension arm and a physical, chemical and biological laboratory suspension system. Background Art

[0002] In the laboratory, the gas generated during the experiment is usually sucked away by connecting the suction nozzle to the negative pressure system. The suction nozzle is installed on the boom, which can rotate along the horizontal axis. When rotating upward, the suction nozzle can be folded upward, and when rotating downward, the suction nozzle can be opposite to the laboratory table to absorb the gas generated during the experiment. However, when the suction nozzle is opposite to the laboratory table, the lowest position of the boom is fixed and cannot be adjusted, which easily blocks the sight of students in the back row. Utility Model Content

[0003] The utility model aims to provide a vacuum boom and a lifting system for a physics, chemistry and biology laboratory, which can adjust its own length in the vertical direction while generating gas during the extraction experiment, and is not easy to block the sight of students in the back row.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] In a first aspect, the utility model provides an air extraction boom, comprising an air extraction pipe group, a telescopic mechanism, and a plurality of lifting sections arranged in sequence along a vertical direction, wherein any two adjacent lifting sections slide together in a vertical direction;

[0006] The telescopic mechanism is located in the plurality of lifting sections, one end of the telescopic mechanism is connected to the lifting section at the top, and the other end is connected to the lifting section at the bottom;

[0007] The exhaust pipe group comprises a telescopic part and a swinging part connected to the telescopic part, the telescopic part is located in the plurality of lifting sections, one end of the telescopic part is connected to the topmost lifting section, and the other end is connected to the bottommost lifting section, the swinging part is located outside the plurality of lifting sections and is rotatably connected to the bottom end of the telescopic part, the rotation axis of the swinging part is perpendicular to the vertical direction, and the end of the swinging part away from the telescopic part has an exhaust port.

[0008] Further, the swinging part includes a first transfer tube and an extension tube;

[0009] One end of the first transfer tube is rotatably connected to the bottom end of the telescopic portion around a first axis, and the first axis is perpendicular to the vertical direction;

[0010] The other end of the first transfer tube is rotatably connected to the extension tube around a second axis, the second axis is perpendicular to the first axis and coincides with the axis of the extension tube, and the air extraction port is provided at one end of the extension tube away from the first transfer tube.

[0011] Furthermore, the telescopic part includes a plurality of tube bodies arranged in sequence along the vertical direction, any two adjacent tube bodies slide in the vertical direction and are sealed together, the tube body at the top is connected to the lifting section at the top, the tube body at the bottom is connected to the lifting section at the bottom, and the swing part is rotatably connected to the tube body at the bottom.

[0012] Furthermore, the side walls of the other lifting sections except the top lifting section are recessed with grooves for accommodating the swinging part, and the bottom end of the top lifting section has a avoidance opening facing the groove in the vertical direction, and the avoidance opening allows the swinging part to extend into the top lifting section.

[0013] Furthermore, in any two adjacent lifting sections:

[0014] The upper lifting section is sleeved on the outside of the lower lifting section;

[0015] One of the inner wall of the upper lifting section and the outer wall of the lower lifting section is provided with a guide rail, and the other is provided with a guide wheel group that slides with the guide rail in the vertical direction.

[0016] Furthermore, in any two adjacent lifting sections:

[0017] The upper lifting section is provided with a first limiting structure, and the lower lifting section is provided with a second limiting structure, and the second limiting structure is used to cooperate with the first limiting structure to limit the downward movement distance of the lower lifting section.

[0018] Furthermore, the first limiting structure includes a limiting block and a locking member, and the limiting block is connected to the bottom end of the inner wall of the upper lifting section through the locking member;

[0019] The second limiting structure includes a protrusion connected to the outer wall of the lower lifting section, and the protrusion is used to abut against the top surface of the limiting block to limit the downward movement distance of the lower lifting section.

[0020] Furthermore, the lifting section at the bottom is provided with a display screen and / or a USB interface;

[0021] When the USB interface is provided at the bottom of the lifting section, a cover for opening and closing the USB interface is provided at the USB interface.

[0022] In a second aspect, the utility model also provides a physical, chemical and biological laboratory lifting system, comprising an upper cover shell and the vacuum boom described in the above scheme, wherein the upper cover shell has an opening for the topmost lifting section to pass through, and the upper cover shell and the topmost lifting section are used to be connected to the roof structure.

[0023] Furthermore, an air pipe, a water pipe and an electric circuit are provided in the upper cover shell, the air pipe is connected to the air extraction pipe group, the water pipe is connected to the water inlet on the topmost lifting section, and the electric circuit is connected to at least the telescopic mechanism.

[0024] The vacuum boom and physical, chemical and biological laboratory hoisting system provided by the utility model can produce the following beneficial effects:

[0025] When the vacuum boom is not needed, the telescopic mechanism can drive the bottom lifting section to retract upward, minimizing the height space occupied by multiple lifting sections. When the vacuum boom is needed, the telescopic mechanism drives the bottom lifting section to move downward, and at the same time manually swings the swing part relative to the telescopic part, so that the swing part extends from the side of the lifting section, and the air suction port at its end can absorb the gas generated during the experiment. The user can adjust the height of the bottom lifting section through the telescopic mechanism to avoid obstructing the sight of the students in the back row. During the adjustment process, the telescopic part follows the telescopic mechanism to extend and retract to adapt to the extended length of multiple lifting sections.

[0026] Compared with the prior art, the vacuum boom provided in the first aspect of the utility model can adjust its own length in the vertical direction while generating gas during the extraction experiment, and is not easy to block the sight of students in the back row.

[0027] The physical, chemical and biological laboratory hoisting system provided in the second aspect of the utility model has the air extraction boom provided in the first aspect of the utility model, and thus has all the beneficial effects of the air extraction boom provided in the first aspect of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of the three-dimensional structure of a vacuum boom provided in an embodiment of the utility model;

[0030] Figure 2 A three-dimensional schematic diagram of the internal structure of a vacuum boom provided in an embodiment of the utility model;

[0031] Figure 3 A schematic diagram of the three-dimensional structure of a physical, chemical and biological laboratory hoisting system provided by an embodiment of the utility model at a first viewing angle;

[0032] Figure 4 A schematic diagram of the three-dimensional structure of a vacuum boom (without the second lifting section) provided in an embodiment of the utility model;

[0033] Figure 5 for Figure 4 A local enlarged schematic diagram of point A;

[0034] Figure 6 A schematic diagram of the three-dimensional structure of a vacuum boom (without the first lifting section) provided in an embodiment of the utility model;

[0035] Figure 7 for Figure 6 A local enlarged schematic diagram of point B;

[0036] Figure 8 A schematic diagram of the three-dimensional structure of a physical, chemical and biological laboratory lifting system under a second viewing angle provided in an embodiment of the utility model.

[0037] Icons: 1-exhaust pipe group; 11-telescopic part; 12-swinging part; 121-first transfer pipe; 122-extension pipe; 1221-exhaust port; 2-telescopic mechanism; 3-first axis; 4-second axis; 5-groove; 6-avoidance; 7-guide rail; 8-guide wheel group; 81-upper guide wheel; 82-lower guide wheel; 9-limiting block; 10-locking piece; 011-protrusion; 012-display screen; 013-cover; 014-upper cover; 015-first lifting section; 016-second lifting section; 017-third lifting section; 018-connecting plate; 019-water outlet joint; 020-network cable interface; 021-line interface. DETAILED DESCRIPTION

[0038] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0042] The first aspect of the present invention provides a vacuum boom. Figure 1 and Figure 2 As shown, it includes an exhaust pipe group 1, a telescopic mechanism 2, and a plurality of lifting sections arranged in sequence along the vertical direction, and any two adjacent lifting sections slide together in the vertical direction;

[0043] The telescopic mechanism 2 is located in the plurality of lifting sections, one end of the telescopic mechanism 2 is connected to the topmost lifting section, and the other end is connected to the bottommost lifting section;

[0044] The exhaust pipe group 1 has a telescopic part 11 and a swinging part 12 connected to the telescopic part 11, the telescopic part 11 is located in a plurality of lifting sections, one end of the telescopic part 11 is connected to the topmost lifting section, and the other end is connected to the bottommost lifting section, the swinging part 12 is located outside the plurality of lifting sections and is rotatably connected to the bottom end of the telescopic part 11, the rotation axis of the swinging part 12 is perpendicular to the vertical direction, and the end of the swinging part 12 away from the telescopic part 11 has an exhaust port 1221.

[0045] In the vacuum boom provided in the above embodiment, when not in use, the telescopic mechanism 2 can drive the bottommost lifting section to retract upward, minimizing the height space occupied by multiple lifting sections. When the vacuum boom needs to be used, the telescopic mechanism 2 can drive the bottommost lifting section to move downward, and at the same time manually swing the swing part 12 relative to the telescopic part 11, so that the swing part 12 extends from the side of the lifting section, and the air suction port 1221 at the end of the swing part 12 can absorb the gas generated during the experiment. The user can adjust the height of the bottommost lifting section through the telescopic mechanism 2 to avoid obstructing the sight of the students in the back row. During the adjustment process, the telescopic part 11 follows the telescopic mechanism 2 to extend and retract to adapt to the extended length of multiple lifting sections.

[0046] Compared with the prior art, the vacuum boom provided in the embodiment of the first aspect of the utility model can adjust its own length in the vertical direction while generating gas during the extraction experiment, and is not easy to block the sight of students in the back row.

[0047] The number of lifting segments may be two, three, four or five. In a preferred embodiment, the number of lifting segments is three. The following description will be made using the number of lifting segments being three as an example. To facilitate the specific description of each lifting segment, the three lifting segments are set to be the first lifting segment 015, the second lifting segment 016 and the third lifting segment 017 from top to bottom in the vertical direction.

[0048] The telescopic mechanism 2 can adopt various structural forms, such as a hydraulic cylinder or a pneumatic cylinder, and the two ends of the hydraulic cylinder or the pneumatic cylinder are respectively connected to the first lifting section 015 and the third lifting section 017; the telescopic mechanism 2 can also be a combination structure of a motor and a screw nut, and its transmission principle is a well-known technology and will not be described in detail here. That is, any structure that can drive the third lifting section 017 to rise and fall can be used.

[0049] In an optional embodiment, if Figure 2 As shown, the swinging portion 12 includes a first transfer tube 121 and an extension tube 122, wherein:

[0050] One end of the first transfer tube 121 is rotatably connected to the bottom end of the telescopic portion 11 around the first axis 3, and the first axis 3 is perpendicular to the vertical direction;

[0051] The other end of the first transfer tube 121 is rotatably connected to the extension tube 122 around the second axis 4 . The second axis 4 is perpendicular to the first axis 3 and coincides with the axis of the extension tube 122 . The air inlet 1221 is provided at one end of the extension tube 122 away from the first transfer tube 121 .

[0052] The above arrangement allows the extension tube 122 to not only rotate around the first axis 3 and extend from the side of the third lifting section 017, but also rotate on its own to change the direction of the exhaust port 1221 at its end, making it easier to absorb the gas generated during the experiment.

[0053] Specifically, the first adapter tube 121 is an "L"-shaped tube, one end of which is rotatably connected to the telescopic part 11, and the other end is rotatably connected to the extension tube 122. A through hole is provided at the third lifting section 017 corresponding to the position where the first adapter tube 121 is rotatably connected to the telescopic part 11, so as to facilitate the exhaust pipe group 1 to extend out of the third lifting section 017.

[0054] In an optional embodiment, a drawstring is further connected to the side wall of the extension tube 122 to facilitate the user to take the extension tube 122 .

[0055] In an optional embodiment, the top end of the telescopic part 11 can be connected to a seat cover, which can be fixedly connected to the top plate of the first lifting section 015 by bolts and other connecting parts, and the bottom end of the telescopic part 11 can be connected to a mounting seat, which can be fixedly connected to the third lifting section 017 by bolts and other connecting parts.

[0056] In an optional embodiment, the telescopic portion 11 includes a plurality of tube bodies arranged in sequence along the vertical direction, any two adjacent tube bodies slide in the vertical direction and are sealed together, the topmost tube body is connected to the topmost lifting section, the bottommost tube body is connected to the bottommost lifting section, and the swing portion 12 is rotatably connected to the bottommost tube body.

[0057] In the telescopic part 11, since any two adjacent tubes slide together in the vertical direction, the length of the telescopic part 11 can adapt to the change in the height of the third lifting section 017 during the process of the telescopic mechanism 2 driving the third lifting section 017 to rise and fall. The sealing cooperation of any two adjacent tubes can ensure the sealing between the tubes and avoid air leakage between the adjacent tubes. The sealing structure can be a sealing ring, etc.

[0058] Specifically, in two adjacent tube bodies, the upper tube body can be sleeved on the outside of the lower tube body to facilitate assembly between the tube bodies.

[0059] To facilitate the rotational cooperation between the bottom tube body and the first adapter tube 121 , a second adapter tube is connected to the bottom end of the bottom tube body. The second adapter tube is bent into an "L" shape, with one end fixedly connected to the bottom tube body and the other end rotationally connected to the first adapter tube 121 .

[0060] In an optional embodiment, if Figure 1 and Figure 3As shown, the side walls of the second lifting section 016 and the third lifting section 017 are recessed with grooves 5 for accommodating the swinging portion 12 , and the bottom end of the first lifting section 015 has an escape opening 6 facing the groove 5 in the vertical direction.

[0061] When the telescopic mechanism 2 drives the third lifting section 017 to move upward, the swing part 12 moves upward synchronously. The setting of the above-mentioned avoidance opening 6 can allow the swing part 12 to extend into the first lifting section 015, so that the first lifting section 015 will not hinder the upward movement of the swing part 12, and the size of the vacuum boom after contraction is smaller.

[0062] The exhaust pipe group 1 can be configured as one or more than two, three, etc. Figure 2 As shown, there are two exhaust pipe groups 1, which are arranged opposite to each other and located on both sides of the telescopic mechanism 2. At this time, the second lifting section 016 and the third lifting section 017 are both provided with two grooves 5, and the two grooves 5 are used to accommodate the two swinging parts 12 respectively.

[0063] In an optional embodiment, in any two adjacent lifting sections, Figure 1 As shown:

[0064] The upper lifting section is sleeved on the outside of the lower lifting section;

[0065] like Figures 4 to 7 As shown, one of the inner wall of the upper lifting section and the outer wall of the lower lifting section is provided with a guide rail 7, and the other is provided with a guide wheel group 8 that slides with the guide rail 7 in the vertical direction.

[0066] Take the lifting of the second lifting section 016 relative to the first lifting section 015 as an example: the outer wall of the second lifting section 016 is provided with a guide wheel group 8, and the inner wall of the first lifting section 015 is provided with a guide rail 7. When the second lifting section 016 slides up and down, the guide wheel group 8 slides relative to the guide rail 7, thereby guiding the second lifting section 016.

[0067] In an optional embodiment, if Figure 7 As shown, the guide wheel group 8 includes an upper guide wheel 81 and a lower guide wheel 82 which are spaced apart from each other. Figure 5 As shown, the upper guide wheel 81 and the lower guide wheel 82 each include two wheel bodies connected by a connecting shaft, and the guide rail 7 is clamped between the two wheel bodies. One of the wheel bodies extends into the slide groove formed by the guide rail 7, and the outer peripheral surface of the wheel body and the slide groove can roll relative to each other, thereby reducing the friction between the second lifting section 016 and the first lifting section 015.

[0068] In an optional embodiment, in any two adjacent lifting sections: the upper lifting section is provided with a first limiting structure, and the lower lifting section is provided with a second limiting structure, and the second limiting structure is used to cooperate with the first limiting structure to limit the downward movement distance of the lower lifting section.

[0069] Taking the lifting of the second lifting section 016 relative to the first lifting section 015 as an example, the above embodiment can limit the downward movement distance of the second lifting section 016 relative to the first lifting section 015 to avoid the second lifting section 016 from separating from the first lifting section 015.

[0070] In an optional embodiment, taking the lifting of the second lifting section 016 relative to the first lifting section 015 as an example, Figure 5 As shown, the first limiting structure includes a limiting block 9 and a locking member 10, and the limiting block 9 is connected to the bottom end of the inner wall of the first lifting section 015 through the locking member 10. Specifically, the inner wall of the first lifting section 015 has a mounting hole, and the locking member 10 can penetrate the limiting block 9 and be inserted into the mounting hole to achieve fixed connection between the limiting block 9 and the inner wall of the first lifting section 015.

[0071] The locking member 10 may be a screw or a pin.

[0072] When the limiting blocks 9 are configured as multiple equal-height ones, the limiting blocks 9 can be connected by a connecting plate 018 to increase the position firmness of the limiting blocks 9 .

[0073] like Figure 5 and Figure 7 As shown, the second limiting structure includes a protrusion 011 connected to the outer wall of the second lifting section 016 by connecting parts such as screws. When the second lifting section 016 moves down to the extreme position, the protrusion 011 abuts against the top surface of the limiting block 9 to limit the downward movement distance of the second lifting section 016.

[0074] like Figure 7 As shown, the height of the protrusion 011 is lower than the height of the lower guide wheel 82, so that when the second lifting section 016 moves down to the extreme position, the protrusion 011 contacts the limit block 9 first.

[0075] It can be understood that the sliding cooperation and limiting method between the second lifting section 016 and the third lifting section 017 are similar to the sliding cooperation and limiting method between the first lifting section 015 and the second lifting section 016. In order to save space, they are not described in detail here.

[0076] In an optional embodiment, if Figure 1 As shown, the third lifting section 017 is provided with a display screen 012, and the display screen may have a plurality of touch buttons to facilitate the user to perform experimental operations.

[0077] In an optional embodiment, for the convenience of users, the third lifting section 017 is provided with multiple USB interfaces, such as Figure 1 As shown, each USB interface is provided with a cover 013 for opening and closing the USB interface, and the cover 013 can protect the USB interface.

[0078] In an optional embodiment, if Figure 3 As shown, the bottom plate of the third lifting section 017 is provided with a water outlet joint 019 , a network cable interface 020 and a line interface 021 , and the water inlet joint can be provided on the top plate of the first lifting section 015 .

[0079] The second aspect of the present invention provides a physical, chemical and biological laboratory hoisting system. Figure 8 As shown, the physics, chemistry and biology laboratory lifting system provided by the embodiment of the second aspect of the utility model includes an upper cover shell 014 and the above-mentioned vacuum boom, the upper cover shell 014 has an opening for the topmost lifting section to pass through, and the upper cover shell 014 and the topmost lifting section are used to connect to the roof structure.

[0080] The physics, chemistry and biology laboratory hoisting system provided in the second aspect of the utility model has the vacuum boom provided in the embodiment of the first aspect of the utility model, and thus has all the beneficial effects of the vacuum boom provided in the embodiment of the first aspect of the utility model.

[0081] In an optional embodiment, an air pipe, a water pipe and an electric circuit are provided in the upper cover shell 014; the air pipe is connected to the air extraction pipe group 1; the water pipe is connected to the water inlet on the topmost lifting section; and the electric circuit is connected to at least the telescopic mechanism 2.

[0082] The above arrangement enables the water supply, power supply and gas supply structures in the laboratory to be integrated into the upper cover 014 on the top of the laboratory. Compared with the arrangement under the laboratory floor, it is safer and more convenient for maintenance.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A vacuum boom, characterized in that: It comprises an exhaust pipe group (1), a telescopic mechanism (2), and a plurality of lifting sections arranged in sequence along a vertical direction, wherein any two adjacent lifting sections slide in cooperation with each other in the vertical direction; The telescopic mechanism (2) is located in the plurality of lifting sections, one end of the telescopic mechanism (2) is connected to the lifting section at the top, and the other end is connected to the lifting section at the bottom; The exhaust pipe group (1) comprises a telescopic part (11) and a swinging part (12) connected to the telescopic part (11); the telescopic part (11) is located in the plurality of lifting sections; one end of the telescopic part (11) is connected to the topmost lifting section, and the other end is connected to the bottommost lifting section; the swinging part (12) is located outside the plurality of lifting sections and is rotatably connected to the bottom end of the telescopic part (11); the rotation axis of the swinging part (12) is perpendicular to the vertical direction; and the end of the swinging part (12) away from the telescopic part (11) comprises an exhaust port (1221).

2. The vacuum boom according to claim 1, characterized in that: The swinging part (12) comprises a first transfer tube (121) and an extension tube (122); One end of the first transfer tube (121) is rotatably connected to the bottom end of the telescopic portion (11) around a first axis (3), and the first axis (3) is perpendicular to the vertical direction; The other end of the first transfer tube (121) is rotatably connected to the extension tube (122) around a second axis (4); the second axis (4) is perpendicular to the first axis (3) and coincides with the axis of the extension tube (122); and the air suction port (1221) is provided at an end of the extension tube (122) that is away from the first transfer tube (121).

3. The vacuum boom according to claim 1, characterized in that: The telescopic part (11) comprises a plurality of tubes arranged in sequence along the vertical direction, any two adjacent tubes slide in the vertical direction and are sealed together, the tube at the top is connected to the lifting section at the top, the tube at the bottom is connected to the lifting section at the bottom, and the swing part (12) is rotatably connected to the tube at the bottom.

4. The vacuum boom according to claim 1, characterized in that: The side walls of the other lifting sections except the lifting section at the top are provided with a groove (5) for accommodating the swinging part (12), and the bottom end of the lifting section at the top is provided with a avoidance opening (6) facing the groove (5) in the vertical direction, and the avoidance opening (6) allows the swinging part (12) to extend into the lifting section at the top.

5. The vacuum boom according to claim 1, characterized in that: In any two adjacent lifting sections: The upper lifting section is sleeved on the outside of the lower lifting section; One of the inner wall of the upper lifting section and the outer wall of the lower lifting section is provided with a guide rail (7), and the other is provided with a guide wheel group (8) that is slidably matched with the guide rail (7) in the vertical direction.

6. The vacuum boom according to claim 1, characterized in that: In any two adjacent lifting sections: The upper lifting section is provided with a first limiting structure, and the lower lifting section is provided with a second limiting structure, and the second limiting structure is used to cooperate with the first limiting structure to limit the downward movement distance of the lower lifting section.

7. The vacuum boom according to claim 6, characterized in that: The first limiting structure comprises a limiting block (9) and a locking member (10), and the limiting block (9) is connected to the bottom end of the inner wall of the lifting section above via the locking member (10); The second limiting structure comprises a protrusion (011) connected to the outer wall of the lower lifting section, and the protrusion (011) is used to abut against the top surface of the limiting block (9) to limit the downward movement distance of the lower lifting section.

8. The vacuum boom according to claim 1, characterized in that: The lifting section at the bottom is provided with a display screen (012) and / or a USB interface; When the USB interface is provided at the bottom of the lifting section, a cover (013) for opening and closing the USB interface is provided at the USB interface.

9. A physical, chemical and biological laboratory hoisting system, characterized in that: It comprises an upper cover shell (014) and an exhaust boom as claimed in any one of claims 1 to 8, wherein the upper cover shell (014) has an opening for the topmost lifting section to pass through, and the upper cover shell (014) and the topmost lifting section are used to be connected to a roof structure.

10. The physical, chemical and biological laboratory hoisting system according to claim 9 is characterized in that: An air pipe, a water pipe and an electric circuit are arranged in the upper cover shell (014); the air pipe is connected to the air extraction pipe group (1); the water pipe is connected to the water inlet on the topmost lifting section; and the electric circuit is connected to at least the telescopic mechanism (2).

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