A separable connecting sheet metal part for lifting a blackboard and a lifting blackboard

Abstract

The utility model belongs to the technical field of education equipment, provide a kind of separable connecting sheet metal part and lifting blackboard for lifting blackboard, the separable connecting sheet metal part for lifting blackboard includes connecting plate, two first mounting plate and second mounting plate, connecting plate is used to be attached with the rear side of the plate body of blackboard;Two first mounting plate is respectively arranged in the upper and lower ends of connecting plate, and is vertically connected with connecting plate, to be connected with the upper and lower sides of plate body;Second mounting plate is arranged between two first mounting plate, and is vertically connected with connecting plate, to install sliding member, and sliding member is slidably connected with blackboard frame.The lifting blackboard includes the separable connecting sheet metal part described above.The separable connecting sheet metal part and lifting blackboard for lifting blackboard provided by the utility model realize the separable connection of blackboard main body and frame, reduce maintenance cost;Simplify transportation and installation process;Upgrade the adaptability and maintenance convenience of electronic equipment.

Description

Technical Field

[0001] This utility model belongs to the field of educational equipment technology, specifically relating to a detachable connecting sheet metal part and a height-adjustable blackboard. Background Technology

[0002] In educational settings, smart height-adjustable blackboards are becoming increasingly common. Traditional smart height-adjustable blackboards have a relatively simple connection method between the blackboard frame and the main body. A common method is to fix the main body of the blackboard to the frame using screws and other devices. This method makes it difficult to disassemble and replace the main body or frame separately after installation.

[0003] Some designs use an integrated molding method, manufacturing the blackboard and frame as a single unit. While this ensures structural stability to some extent, it greatly increases the difficulty of transportation and installation. Furthermore, if any part is damaged, the entire unit needs to be replaced, resulting in high costs.

[0004] For intelligent height-adjustable blackboards that require the installation of electronic devices, the installation space for these devices is limited due to the unreasonable connection between the blackboard and the frame, making the installation and maintenance process extremely inconvenient. For example, when it is necessary to repair or upgrade built-in electronic components such as displays and touch modules, the tight connection between the blackboard and the frame and the limited operating space often require maintenance personnel to spend a lot of time and effort removing surrounding parts, which may even cause additional damage to the blackboard or frame. Utility Model Content

[0005] This utility model provides a detachable connecting sheet metal part and a lifting blackboard for a lifting blackboard, aiming to solve the technical problems of high maintenance costs, inconvenient installation and transportation, and poor compatibility with electronic devices in the existing intelligent lifting blackboard frame and blackboard body connection method.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: In a first aspect, embodiments of this utility model provide a detachable connecting sheet metal part for raising and lowering a blackboard, comprising: A connecting plate is used to attach to the back of the blackboard. Two first mounting plates are respectively located at the upper and lower ends of the connecting plate and are perpendicularly connected to the connecting plate for connecting to the upper and lower sides of the plate body; The second mounting plate is located between the two first mounting plates and is perpendicularly connected to the connecting plate. It is used to install the sliding component, which slides in conjunction with the blackboard frame.

[0007] In conjunction with the first aspect, in one possible implementation of the detachable connecting sheet metal part for raising and lowering a blackboard provided by this utility model, the connecting plate includes a vertical plate and two horizontal plates, the two horizontal plates being vertically disposed on the side of the vertical plate facing the plate body and connected to the vertical plate; the first mounting plate is connected to the horizontal plates, and the second mounting plate is connected to the vertical plate.

[0008] In conjunction with the first aspect, in one possible implementation of the detachable connecting sheet metal part for raising and lowering a blackboard provided by this utility model, the second mounting plate is equal in length to the vertical plate.

[0009] In conjunction with the first aspect, in one possible implementation of the detachable connecting sheet metal part for raising and lowering a blackboard provided by this utility model, the second mounting plate and the vertical plate are formed by vertically bending a single sheet.

[0010] In conjunction with the first aspect, in one possible implementation of the detachable connecting sheet metal part for raising and lowering a blackboard provided by this utility model, the second mounting plate and the first mounting plate are disposed on the same side of the connecting plate.

[0011] In conjunction with the first aspect, in one possible implementation of the detachable connecting sheet metal part for raising and lowering a blackboard provided by this utility model, the first mounting plate is provided with a plurality of first connecting holes, and the second mounting plate is provided with a plurality of second connecting holes.

[0012] In conjunction with the first aspect, in one possible implementation of the detachable connecting sheet metal part for lifting blackboard provided by this utility model, a first ear plate is further included. The first ear plate is disposed on the side of the second mounting plate facing away from the first mounting plate and is fixedly connected to the second mounting plate. The first ear plate is perpendicular to the second mounting plate, and a plurality of third connecting holes are provided on the first ear plate.

[0013] In conjunction with the first aspect, in one possible implementation of the detachable connecting sheet metal part for raising and lowering a blackboard provided by this utility model, a second ear plate is further included. The second ear plate is disposed below the first ear plate and is perpendicularly connected to the second mounting plate. A guide hole is provided on the second ear plate.

[0014] In conjunction with the first aspect, in one possible implementation of the detachable connecting sheet metal part for raising and lowering a blackboard provided by this utility model, the connecting plate, the first mounting plate, and the second mounting plate are integrally connected.

[0015] Secondly, this utility model embodiment provides a lifting blackboard, including the aforementioned detachable connecting sheet metal parts for lifting blackboards.

[0016] The beneficial effects of the detachable connecting sheet metal part and the lifting blackboard provided by this utility model are as follows: Compared with the prior art, the detachable connecting sheet metal part and the lifting blackboard provided by this utility model form a stable fixation of the blackboard body by attaching the connecting plate to the rear side of the blackboard body and connecting the two first mounting plates to the upper and lower sides of the board body; at the same time, the sliding parts that slide with the blackboard frame are installed by the second mounting plate, so that the blackboard body and the frame form a relatively separable sliding connection structure. Compared to traditional screw-fixed designs that are difficult to disassemble individually or unibody designs that require complete replacement, this structure allows for easy disassembly and replacement of the blackboard body or frame, avoiding the need for complete replacement due to partial damage and significantly reducing maintenance costs. Since the blackboard body and frame are connected by detachable sheet metal components rather than being a single piece, they can be transported separately, reducing the transportation difficulties caused by the overall size. Installation simply requires connecting the two parts using sliding components, and then securing the blackboard body with the first mounting plate and connecting plate. This significantly simplifies transportation and installation compared to the complex installation process of unibody structures. The layout of the connecting plate, first mounting plate, and second mounting plate creates a relatively spacious gap between the blackboard body and frame, providing ample space for the installation of electronic devices such as displays and touch modules. Furthermore, because the blackboard body and frame can be easily separated using sliding components, the blackboard body can be easily disassembled when electronic devices need repair or upgrades, avoiding the limited operating space caused by traditional tightly connected structures. This reduces additional damage to the blackboard or frame during repairs and significantly improves the compatibility and maintenance convenience of electronic devices. Attached Figure Description

[0017] Figure 1 A three-dimensional structural diagram of a detachable connecting sheet metal part for raising and lowering a blackboard, provided for an embodiment of this utility model; Figure 2 for Figure 1 Enlarged view of part A in the image; Figure 3 A rear view structural diagram of the lifting blackboard provided in an embodiment of this utility model; Figure 4 For along Figure 3 Cross-sectional view of line AA in the middle; Figure 5 for Figure 4 Enlarged view of part B in the image; Explanation of reference numerals in the attached figures: 11. Vertical plate; 12. Horizontal plate; 20. First mounting plate; 21. First connecting hole; 30. Second mounting plate; 31. Second connecting hole; 40. First ear plate; 41. Third connecting hole; 50. Second ear plate; 51. Guide hole; 61. Plate body; 62. Sliding component; 63. Blackboard border. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is actually illustrative only and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0022] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0023] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.

[0024] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0025] Please refer to the following: Figures 1 to 5 The detachable connecting sheet metal part for raising and lowering a blackboard provided by this utility model will now be described. The detachable connecting sheet metal part for raising and lowering a blackboard includes a connecting plate, two first mounting plates 20 and a second mounting plate 30. The connecting plate is used to fit against the rear side of the blackboard body 61. The two first mounting plates 20 are respectively disposed at the upper and lower ends of the connecting plate and are perpendicularly connected to the connecting plate, and are used to connect to the upper and lower sides of the blackboard body 61. The second mounting plate 30 is disposed between the two first mounting plates 20 and is perpendicularly connected to the connecting plate, and is used to install a sliding member 62. The sliding member 62 slides in cooperation with the blackboard frame 63.

[0026] The beneficial effects of the detachable connecting sheet metal part for raising and lowering a blackboard provided in this embodiment of the utility model are: 1. Achieve a detachable connection between the blackboard body and the frame, reducing maintenance costs: In the technical solution, the connecting plate is attached to the rear side of the blackboard body 61, and the two first mounting plates 20 are connected to the upper and lower sides of the blackboard body 61, so as to form a stable fixation for the blackboard main body; meanwhile, the sliding member 62 that is in sliding fit with the blackboard frame 63 is mounted via the second mounting plate 30, so that a slidable connection structure allowing relative separation between the blackboard main body and the frame is formed. Compared with the conventional manner that fixing by screws makes individual disassembly difficult or integrated forming requires overall replacement, the structure can conveniently realize individual disassembly and replacement of the blackboard main body or the frame, avoids overall replacement caused by local damage, and significantly reduces maintenance costs.

[0027] 2. Simplify transportation and installation procedures: Since the blackboard main body and the frame are connected via a separable sheet metal structure rather than being integrally formed, the blackboard main body and the frame can be transported separately during transportation, which reduces transportation difficulty caused by the overall volume; during installation, the two parts only need to be fittingly connected via the sliding member 62, and then the blackboard main body is fixed via the first mounting plates 20 and the connecting plate. Compared with the complex installation procedure of an integrally formed structure, the transportation and installation operations are greatly simplified.

[0028] 3. Improve the adaptability and maintenance convenience for electronic equipment: The layout design of the connecting plate, the first mounting plates 20 and the second mounting plates 30 forms a relatively loose gap space between the blackboard main body and the frame, which provides sufficient space for installation of electronic equipment such as display screens and touch modules; meanwhile, since the blackboard main body and the frame can be conveniently separated via the sliding member 62, when maintenance or upgrade of the electronic equipment is required, the blackboard main body can be easily disassembled, which avoids the problem of narrow operation space caused by the traditional tight connection structure, reduces additional damage to the blackboard or the frame during maintenance, and significantly improves the adaptability and maintenance convenience for electronic equipment As Figure 1 and Figure 2 shown, in a specific embodiment of the separable connecting sheet metal part for liftable blackboards provided by the embodiment of the present utility model, the connecting plate specifically comprises a vertical plate 11 and two horizontal plates 12; the two horizontal plates 12 are vertically arranged on the side of the vertical plate 11 facing the blackboard body 61, and are fixedly connected to the vertical plate 11 (such as welding, integral bending, etc.); the first mounting plate 20 is fixedly connected to one end of the horizontal plate 12 away from the vertical plate 11 (such as bolt connection, integral forming), and the second mounting plate 30 is fixedly connected to the side of the vertical plate 11 away from the horizontal plates 12.

[0029] Wherein, the vertical plate 11 extends along the height direction of the blackboard body 61, and the two horizontal plates 12 are respectively located at the upper and lower ends of the vertical plate 11, forming a "匚"-shaped structure with the vertical plate 11 (with the opening facing the blackboard body 61), so that the attaching area between the connecting plate and the blackboard body 61 is larger — the vertical plate 11 is attached to the middle part of the rear side of the body 61, and the two horizontal plates 12 are respectively attached to the edges of the upper and lower sides of the body 61.

[0030] It should be noted that the "匚"-shaped structure formed by the vertical plate 11 and the horizontal plate 12 increases the contact area between the connecting plate and the blackboard body 61, disperses the weight load of the blackboard body, and avoids deformation of the plate body 61 or loose connection caused by excessive local stress.

[0031] The first mounting plate 20 is connected to the horizontal plate 12 and is responsible for fixing the upper and lower edges of the blackboard body, while the second mounting plate 30 is connected to the vertical plate 11 and is responsible for connecting the frame sliding member 62. This arrangement allows the gravity of the blackboard body and the pulling force during lifting to be borne by different structures respectively, thereby improving the bearing capacity of the overall structure.

[0032] As Figure 1 and Figure 2 shown, in a specific embodiment of the separable connecting sheet metal part for a lifting blackboard provided by the embodiment of the present utility model, the length of the second mounting plate 30 is equal to the length of the vertical plate 11, that is, the second mounting plate 30 extends from the top end to the bottom end of the vertical plate 11, completely corresponding to the height direction of the vertical plate 11; the connecting surface of the second mounting plate 30 and the vertical plate 11 covers the entire length direction of the vertical plate 11.

[0033] It should be noted that the equal length of the second mounting plate 30 and the vertical plate 11 enables the mounting positions of the sliding members 62, which cooperate with the frame, to be uniformly distributed along the height direction of the blackboard, avoiding jamming or structural damage caused by local stress concentration during lifting.

[0034] The longer contact length improves the connection strength between the second mounting plate 30 and the vertical plate 11, so that the structure can remain stable even after long-term use for lifting, and the service life is prolonged.

[0035] As Figure 1 and Figure 2 shown, in a specific embodiment of the separable connecting sheet metal part for a lifting blackboard provided by the embodiment of the present utility model, the second mounting plate 30 and the vertical plate 11 are integrally formed by vertically bending the same whole metal plate, that is, one side of the metal plate is linearly bent by 90° through a stamping or bending device to form the mutually perpendicular vertical plate 11 (the main body portion) and the second mounting plate 30 (the bent portion), and there is no joint seam between the two.

[0036] It should be noted that integrated bending eliminates gaps or stress concentration points that may exist in traditional splicing methods such as welding and bolt connection, so that the connection strength between the vertical plate 11 and the second mounting plate 30 is close to the strength of the material itself, and the deformation resistance is stronger.

[0037] It is not necessary to separately produce the vertical plate 11 and the second mounting plate 30 for subsequent assembly, which reduces the number of parts, assembly procedures, production time and production cost.

[0038] like Figure 1 and Figure 2 As shown, in a specific embodiment of the detachable connecting sheet metal part for raising and lowering a blackboard provided in this utility model embodiment, the second mounting plate 30 and the first mounting plate 20 are both disposed on the same side of the connecting plate (i.e., both facing the blackboard body 61 or both facing the blackboard frame 63).

[0039] Specifically, if the vertical plate 11 of the connecting plate faces the blackboard body 61, then the first mounting plate 20 (connecting the blackboard body) and the second mounting plate 30 (connecting the frame slider 62) are both located on the side of the vertical plate 11 facing the body 61, forming a compact single-sided layout.

[0040] It should be noted that the single-sided layout avoids the increase in overall thickness caused by setting mounting plates on both sides of the connecting plate, leaving more installation space for electronic devices inside the blackboard (such as displays and touch modules) and improving the compatibility of electronic devices.

[0041] All mounting structures are concentrated on one side, making it easy for installers to connect and fix the blackboard body to the frame from the same working surface, reducing operation steps and time.

[0042] The forces on both the first mounting plate 20 and the second mounting plate 30 are directed to the same side of the connecting plate, avoiding twisting of the connecting plate caused by forces on both sides and improving the overall structural stability. like Figure 1 and Figure 2 As shown in the embodiment of the detachable connecting sheet metal part for raising and lowering a blackboard provided in this utility model, the first mounting plate 20 has a plurality of first connecting holes 21, such as circular through holes or oblong holes, for fixing the first mounting plate 20 to the upper and lower sides of the blackboard body 61 by fasteners such as screws and bolts; the second mounting plate 30 has a plurality of second connecting holes 31 for fixing the second mounting plate 30 to the sliding part 62 (such as a slider, pulley, etc.) by fasteners. The number and spacing of the connecting holes can be adjusted according to the specifications of the blackboard, for example, one hole every 10-15 cm.

[0043] like Figure 1 and Figure 2 As shown in the embodiment of the detachable connecting sheet metal part for lifting blackboard provided in this utility model, the detachable connecting sheet metal part further includes a first ear plate 40; the first ear plate 40 is disposed on the side of the second mounting plate 30 facing away from the first mounting plate 20 (i.e., it is located on both sides of the second mounting plate 30 respectively with the first mounting plate 20), and is vertically fixedly connected to the second mounting plate 30 (such as by welding or integral bending); the first ear plate 40 is provided with a plurality of third connecting holes 41 for connecting to the chain in the lifting blackboard through fasteners.

[0044] like Figure 1 and Figure 2 As shown in the embodiment of the detachable connecting sheet metal part for raising and lowering the blackboard provided in this utility model, a second ear plate 50 is also included. The second ear plate 50 is disposed on the lower side of the first ear plate 40 and is vertically connected to the second mounting plate 30. A guide hole 51 is provided on the second ear plate 50.

[0045] It should be noted that when the blackboard is an infrared interconnected blackboard, the board body 61 needs to be connected to the data cable. At this time, one end of the data cable passes through the guide hole 51 and connects to the board body 61 of the blackboard so that the data cable and the board body 61 maintain a certain distance to avoid mutual friction.

[0046] like Figure 1 and Figure 2 As shown in the embodiment of the separable connecting sheet metal part for raising and lowering blackboard provided in this utility model, the connecting plate, the first mounting plate 20 and the second mounting plate 30 adopt an integrated connection structure, that is, the same whole metal plate is processed into the overall structure of the three by stamping, bending and other processes, without any splicing parts (such as welding points, bolt connection points).

[0047] It should be noted that the integrated connection eliminates the connection gaps and stress concentrations between the components, significantly improving the overall tensile and bending resistance of the sheet metal parts, and enabling them to withstand greater blackboard weight and lifting impact.

[0048] There is no need to process the three parts separately before assembly, which reduces raw material consumption and assembly steps, shortens the production cycle, and lowers manufacturing costs.

[0049] This avoids problems such as loosening of connections due to long-term use (e.g., weld points falling off, bolts rusting), extends the service life of sheet metal parts, and reduces maintenance frequency.

[0050] Based on the same inventive concept, such as Figures 3 to 5 This utility model embodiment provides a lifting blackboard, including a board body 61 (such as a writing board or an integrated electronic screen board), a blackboard frame 63 (including a lifting guide rail and a drive device), and the aforementioned detachable connecting sheet metal parts; wherein, the connecting plate of the connecting sheet metal parts is attached to the rear side of the blackboard body, the first mounting plate 20 is fixed to the upper and lower sides of the blackboard body, and the second mounting plate 30 slides with the guide rail of the blackboard frame 63 through the sliding member 62 to realize the lifting function of the blackboard body.

[0051] The beneficial effects of the detachable connecting sheet metal part for lifting blackboard provided in this utility model embodiment are as follows: Compared with the prior art, the detachable connecting sheet metal part for lifting blackboard provided in this utility model embodiment, by adopting the above-mentioned detachable connecting sheet metal part, has the detachability of the blackboard body and the frame, which greatly reduces the maintenance cost when there is partial damage (no need to replace the whole body).

[0052] The blackboard body and frame can be separated for transport, reducing packaging volume and transportation difficulty; during installation, it can be quickly fixed through the connecting holes of sheet metal parts, reducing the labor intensity of installation.

[0053] The compact structure and reserved space of the sheet metal parts can meet the installation requirements of electronic devices such as displays and touch modules. Since the main body and the frame can be separated, the electronic devices can be repaired or upgraded without removing the frame, making the operation convenient.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A detachable connecting sheet metal part for raising and lowering a blackboard, characterized in that, include: A connecting plate is used to attach to the back side of the blackboard body (61); Two first mounting plates (20) are respectively located at the upper and lower ends of the connecting plate and are perpendicularly connected to the connecting plate to connect to the upper and lower sides of the plate body (61); The second mounting plate (30) is located between the two first mounting plates (20) and is perpendicularly connected to the connecting plate. It is used to install the sliding member (62), which is in sliding engagement with the blackboard frame (63).

2. The detachable connecting sheet metal part for raising and lowering a blackboard as described in claim 1, wherein the connecting plate includes a vertical plate (11) and two horizontal plates (12), the two horizontal plates (12) are vertically disposed on the side of the vertical plate (11) facing the board body (61) and connected to the vertical plate (11); the first mounting plate (20) is connected to the horizontal plates (12), and the second mounting plate (30) is connected to the vertical plate (11).

3. The detachable connecting sheet metal part for raising and lowering a blackboard as described in claim 2, characterized in that, The second mounting plate (30) is the same length as the vertical plate (11).

4. The detachable connecting sheet metal part for raising and lowering a blackboard as described in claim 2, characterized in that, The second mounting plate (30) and the vertical plate (11) are formed by bending a single plate vertically.

5. The detachable connecting sheet metal part for raising and lowering a blackboard as described in claim 1, characterized in that, The second mounting plate (30) and the first mounting plate (20) are located on the same side of the connecting plate.

6. The detachable connecting sheet metal part for raising and lowering a blackboard as described in claim 1, characterized in that, The first mounting plate (20) has a plurality of first connection holes (21), and the second mounting plate (30) has a plurality of second connection holes (31).

7. The detachable connecting sheet metal part for raising and lowering a blackboard as described in claim 1, characterized in that, It also includes a first ear plate (40), which is located on the side of the second mounting plate (30) facing away from the first mounting plate (20) and is fixedly connected to the second mounting plate (30); the first ear plate (40) is perpendicular to the second mounting plate (30), and a plurality of third connecting holes (41) are provided on the first ear plate (40).

8. The detachable connecting sheet metal part for raising and lowering a blackboard as described in claim 7, characterized in that, It also includes a second ear plate (50), which is located below the first ear plate (40) and is vertically connected to the second mounting plate (30). A guide hole (51) is provided on the second ear plate (50).

9. The detachable connecting sheet metal part for raising and lowering a blackboard as described in claim 1, characterized in that, The connecting plate, the first mounting plate (20) and the second mounting plate (30) are integrally connected.

10. A height-adjustable blackboard, characterized in that, Includes the detachable connecting sheet metal parts for raising and lowering a blackboard as described in any one of claims 1-9.

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