A positioning device, early warning system and a plasterboard edging system

Abstract

This application provides a positioning device, an early warning system, and a gypsum board edge-wrapping system. A positioning device includes: a support assembly comprising a support member and a movable member; the support member has a connecting member; the movable member is sleeved outside the connecting member and configured to move axially along the connecting member; and a positioning sleeve sleeved outside the support assembly, wherein at least one of the support member and the movable member has a pressing surface, and the positioning sleeve has a pressure-receiving surface that mates with the pressing surface; at least one of the pressing surface and the pressure-receiving surface is an inclined surface inclined relative to the axial direction of the connecting member; when the movable member moves axially along the connecting member, the positioning sleeve expands radially along the connecting member under the pressing engagement of the pressing surface and the pressure-receiving surface, thereby forming a tightened positioning with the roll material sleeved outside the positioning sleeve. This positioning device enables the edge-wrapping paper to be stably unwound with uniform tension, improving the edge-wrapping effect and yield of the gypsum board.

Description

Technical Field

[0001] This application relates to, but is not limited to, the field of gypsum board production technology, specifically to a positioning device, an early warning system, and a gypsum board edge-wrapping system. Background Technology

[0002] During the edge-wrapping process of gypsum board, the edge-wrapping paper roll is prone to loosening, slippage, or eccentric rotation during unwinding, making it difficult to maintain stable tension. This tension fluctuation can cause quality problems such as skewing and wrinkling of the edge-wrapping paper when covering the gypsum board, affecting the edge-wrapping effect and yield. Summary of the Invention

[0003] The technical problem to be solved by this application is to provide a positioning device, an early warning system, and a gypsum board edge wrapping system, which enables the edge wrapping paper to be unwound stably and with uniform tension, thereby improving the edge wrapping effect and yield of gypsum board.

[0004] This application provides a positioning device, including: a support assembly, the support assembly including a support member and a movable member, the support member having a connecting member, the movable member being sleeved outside the connecting member and configured to move along the axial direction of the connecting member; and a positioning sleeve, sleeved outside the support assembly, wherein at least one of the support member and the movable member has a pressing surface, and the positioning sleeve has a pressure-receiving surface that cooperates with the pressing surface, wherein at least one of the pressing surface and the pressure-receiving surface is an inclined surface that is inclined relative to the axial direction of the connecting member; The positioning sleeve is configured such that, when the movable member moves axially along the connector, it expands radially along the connector under the compression fit of the extrusion surface and the pressure-bearing surface, so as to form a tightened positioning with the roll material sleeved on the outside of the positioning sleeve.

[0005] In this way, when the moving part moves along the axial direction of the connector, the pressing surface and the pressure-bearing surface abut against each other and generate a pressing effect. With the cooperation of the inclined surface, the axial movement of the moving part is converted into a radial outward force that causes the positioning sleeve to expand along the radial direction of the connector. The radial expansion of the positioning sleeve generates a tightening force on the roll material (such as edge binding paper), which tightens and positions the roll material. The tightening force can effectively prevent the roll material from loosening, slipping, or eccentric rotation during the unwinding process, so that the roll material is pulled smoothly with a constant and stable tension, avoiding edge skewing and wrinkling caused by tension fluctuations, making the gypsum board edge binding complete, improving the appearance of the gypsum board and the yield rate.

[0006] Based on the above technical solution, the following improvements can be made to this application.

[0007] In an exemplary embodiment, the extrusion surface includes a first extrusion surface that is annularly disposed on the outer side of the support member and a second extrusion surface that is annularly disposed on the outer side of the movable member. Both the first extrusion surface and the second extrusion surface are tapered slopes, and the tapered tips of the first extrusion surface and the second extrusion surface are opposite to each other. The pressure-bearing surface includes a first pressure-bearing surface and a second pressure-bearing surface disposed on the inner side of the positioning sleeve. The first pressure-bearing surface is configured to adapt to and press against the first extrusion surface, and the second pressure-bearing surface is configured to adapt to and press against the second extrusion surface.

[0008] In one exemplary embodiment, the first extrusion surface and the second extrusion surface have the same inclination angle relative to the axial direction of the connector.

[0009] In one exemplary embodiment, a drive member is configured to move the movable member along the axial direction of the connector; and a first elastic member is disposed between the movable member and the support member.

[0010] In one exemplary embodiment, the driving member is sleeved on the outside of the connector and threadedly connected to the connector, and the driving member abuts against the end of the movable member opposite to the first elastic member.

[0011] In one exemplary embodiment, the connector is a connecting sleeve with a central hole, the support member and the connector are integrally formed, and the first elastic member is a spring sleeved on the outside of the connecting sleeve.

[0012] In an exemplary embodiment, the positioning sleeve is an expansion sleeve, which includes a plurality of expansion plates distributed circumferentially along the support assembly and at least one second elastic member sleeved outside the plurality of expansion plates, each of the expansion plates having the pressure-bearing surface.

[0013] This application also provides an early warning system, including: a bracket; and a positioning device as described in any of the above embodiments, the positioning device being disposed on the bracket.

[0014] In one exemplary embodiment, the bracket is provided with a rotating shaft, and the connecting sleeve of the positioning device is sleeved on the rotating shaft and configured to rotate around the rotating shaft.

[0015] In an exemplary embodiment, the warning system further includes: a counter configured to count the number of rotations of the positioning device; a timer configured to time the time it takes for the positioning device to rotate one revolution; an alarm device; and a control device, wherein the counter, the timer, and the alarm device are all electrically connected to the control device, and the control device is configured to control the alarm device to sound an alarm when the counter reaches a preset number of rotations, and to control the alarm device to sound an alarm when the timer reaches a preset duration. This application also provides a gypsum board edging system, including the early warning system as described in any of the above embodiments. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the positioning device provided in some embodiments of this application; Figure 2 This is a schematic diagram of the main structure of a positioning device provided in some embodiments of this application; Figure 3 A cross-sectional view of the positioning device provided in some embodiments of this application; Figure 4 for Figure 3 Enlarged structural diagram of section A in the middle; Figure 5 Another cross-sectional view of the positioning device provided in some embodiments of this application; Figure 6 This is a top view of the positioning device provided in some embodiments of this application; Figure 7 This is a bottom view of the positioning device provided in some embodiments of this application; Figure 8 This is an exploded view of the positioning device provided in some embodiments of this application; Figure 9 for Figure 8 A magnified structural diagram of section B.

[0017] The attached diagram lists the components represented by each number as follows: 1 Support assembly, 11 Support piece, 111 Connecting sleeve, 112 First extrusion surface, 12 Movable piece, 121 Second extrusion surface; 2. Positioning sleeve; 21. First pressure-bearing surface; 22. Second pressure-bearing surface; 23. Expansion plate; 231. Connecting groove; 24. Second elastic element; 3. Drive components; 4. First elastic element; 100 Positioning device, 200 Bracket, 201 Rotating shaft, 202 Pallet, 300 Counter, 400 Counting sensor, 500 Roll material. Detailed Implementation

[0018] The principles and features of this application are described below with reference to the accompanying drawings. The examples given are only for explaining this application and are not intended to limit the scope of this application.

[0019] like Figures 1-9 As shown, this application embodiment provides a positioning device 100, including a support component 1 and a positioning sleeve 2.

[0020] Combination Figure 3 , Figure 4 , Figure 8 as well as Figure 9 As shown, the support assembly 1 includes a support member 11 and a movable member 12. The support member 11 is provided with a connector, and the movable member 12 is sleeved on the connector and configured to move along the axial direction of the connector.

[0021] The positioning sleeve 2 is fitted on the outside of the support assembly 1, and at least one of the support member 11 and the movable member 12 is provided with a pressing surface. The positioning sleeve 2 is provided with a pressure-bearing surface that cooperates with the pressing surface. At least one of the pressing surface and the pressure-bearing surface is an inclined surface that is inclined relative to the axial direction of the connecting member.

[0022] The positioning sleeve 2 is configured such that when the movable part 12 moves axially along the connector, it expands radially along the connector under the compression fit of the extrusion surface and the pressure-bearing surface, so as to form a tight positioning with the roll material 500 sleeved on the outside of the positioning sleeve 2.

[0023] In this way, when the movable part 12 moves along the axial direction of the connector, the pressing surface and the pressure-bearing surface abut against each other and generate a pressing effect. With the cooperation of the inclined surface, the axial movement of the movable part 12 is converted into a radial outward force that causes the positioning sleeve 2 to expand along the radial direction of the connector. The radial expansion of the positioning sleeve 2 generates a tightening force on the roll material 500 (such as edge binding paper), which tightens and positions the roll material 500. The tightening force can effectively prevent the roll material 500 from loosening, slipping or eccentric rotation during the unwinding process, thereby ensuring that the roll material 500 is pulled smoothly with a constant and stable tension, avoiding edge skewing and wrinkling caused by tension fluctuations, making the gypsum board edge binding complete, improving the appearance of the gypsum board and the yield rate.

[0024] In an exemplary embodiment, the extrusion surface includes a first extrusion surface 112, which is annular and disposed on the outer side of the support member 11, and a second extrusion surface 121, which is annular and disposed on the outer side of the movable member 12. Both the first extrusion surface 112 and the second extrusion surface 121 are tapered slopes, and the tapered tips of the first extrusion surface 112 and the second extrusion surface 121 face each other. Figure 3 , Figure 4 , Figure 8 as well as Figure 9 As shown.

[0025] The pressure-bearing surfaces include a first pressure-bearing surface 21 and a second pressure-bearing surface 22 disposed on the inner side of the positioning sleeve 2. The first pressure-bearing surface 21 is configured to be adapted to and press-fit with the first extrusion surface 112, that is, the first pressure-bearing surface 21 and the first extrusion surface 112 have the same inclination angle relative to the axial direction of the connector. The second pressure-bearing surface 22 is configured to be adapted to and press-fit with the second extrusion surface 121, that is, the second pressure-bearing surface 22 and the second extrusion surface 121 have the same inclination angle relative to the axial direction of the connector.

[0026] In this way, when the movable part 12 moves along the connector, the conical inclined surfaces of the annular first extrusion surface 112 and the second extrusion surface 121 simultaneously extrude the inclined surfaces of the first pressure surface 21 and the second pressure surface 22 of the positioning sleeve 2. Under the counteracting action of the first extrusion surface 112 and the second extrusion surface 121, not only is the axial displacement of the positioning sleeve 2 restricted, but the positioning sleeve 2 is also uniformly extruded and expanded radially along the connector. This makes the positioning sleeve 2 more evenly stressed and more coaxial, thus making the expansion of the positioning sleeve 2 more stable. It effectively avoids the problems of swaying, jamming or uneven expansion caused by unilateral extrusion, enhances the tightness reliability between the positioning sleeve 2 and the outer roll 500, makes the outer roll 500 stressed evenly, and improves the assembly accuracy and working stability.

[0027] In one exemplary embodiment, the first pressing surface 112 and the second pressing surface 121 have the same inclination angle relative to the axial direction of the connector, such as... Figure 3 , Figure 4 As shown.

[0028] Since the first pressure surface 21 is adapted to the first extrusion surface 112, and the second pressure surface 22 is adapted to the second extrusion surface 121, the inclination angles of the first pressure surface 21 and the second pressure surface 22 are also the same. With this arrangement, during the extrusion and compression process, the radial component forces of the first pressure surface 21 and the second pressure surface 22 of the positioning sleeve 2 are equal in magnitude and symmetrical in direction, which further improves the stability of the movement and the positioning accuracy of the positioning sleeve 2.

[0029] In one exemplary embodiment, the positioning device 100 further includes a drive member 3 configured to move the movable member 12 along the axial direction of the connector, thereby driving the positioning sleeve 2 to expand radially. The drive member 3 is capable of adjusting the axial movement of the movable member 12.

[0030] In this way, the driving component 3 not only serves to axially limit the movable component 12, preventing it from detaching from the connecting component, but also controls the radial displacement of the positioning sleeve 2 by adjusting the axial movement of the movable component 12. This allows it to adapt to cores of the roll material 500 with different inner diameters within a certain range, without requiring replacement of the positioning device 100 or complex adjustments. This provides excellent compatibility and flexibility for situations where the inner diameter of the roll material 500 varies due to batch or specification differences. In one exemplary embodiment, the positioning device 100 further includes a first elastic member 4, which is disposed between the movable member 12 and the support member 11, such as... Figure 3 As shown.

[0031] In this way, the first elastic element 4 can exert a reaction force on the movable element 12 and the support element 11 through the restoring force generated by its own deformation, thereby supporting the movable element 12 and the support element 11. When the movable element 12 moves along the axial direction of the connecting element, it can also effectively limit the movement stroke, so that the movement stroke is neither too short nor too long, ensuring the smoothness of the movement stroke.

[0032] In an exemplary embodiment, the driving member 3 is sleeved outside the connector and threadedly connected to the connector, and the driving member 3 abuts against the end of the movable member 12 that is away from the first elastic member 4.

[0033] Thus, the rotation drive 3 causes the drive 3 to rotate along the connector, and the drive 3 abuts against the movable part 12 to drive the movable part 12 to move axially along the connector.

[0034] In one exemplary embodiment, combined with Figure 3 , Figure 4 , Figure 8 as well as Figure 9 As shown, the connector is a connecting sleeve 111 with a central hole, the support 11 and the connector are an integral structure, and the first elastic element 4 is a spring and is sleeved on the outside of the connecting sleeve 111.

[0035] Of course, the support member 11 and the connector can also be separate structures, and can be connected as a whole by means of screwing, snap-fitting or other methods.

[0036] With this configuration, the connecting sleeve 111 can limit the spring to prevent it from tilting during extension and retraction. In this way, the reaction force exerted by the spring on the moving part 12 and the support part 11 is also along the axial direction of the connecting part, which helps to prevent jamming or other problems between the moving part 12 and the support part 11.

[0037] In an exemplary embodiment, the positioning sleeve 2 is an expansion sleeve, which includes a plurality of expansion tabs 23 distributed circumferentially along the support assembly 1 and at least one second elastic element 24 sleeved on the plurality of expansion tabs 23. Each expansion tab 23 is provided with a pressure-bearing surface, such as... Figure 8 and Figure 9 As shown.

[0038] The tightening sleeve includes two second elastic elements 24. These second elastic elements 24 reliably bind multiple tightening plates 23 together, ensuring the structural integrity of the positioning sleeve 2. Simultaneously, the elastic constraint force of the second elastic elements 24 ensures that each tightening plate 23 always has a radial contraction tendency, providing elastic restoring force for the tightening plates 23 to adapt to the cores of the roll material 500 with different inner diameters, thus guaranteeing the reliability of the tightening adjustment. The second elastic elements 24 can be, but are not limited to, O-rings, elastic clamps, or rubber rings.

[0039] In other exemplary embodiments, the expansion sleeve may be an elastic element capable of elastic deformation, and the elastic element may be made of rubber sleeve or other elastic material with equivalent elastic deformation capability.

[0040] In an exemplary embodiment, each tensioning piece 23 is provided with a connecting groove 231 that is adapted to the second elastic member 24, and the second elastic member 24 is simultaneously sleeved in the connecting grooves 231 of multiple tensioning pieces 23.

[0041] Thus, the connecting groove 231 acts as a limit for the second elastic element 24, preventing the second elastic element 24 from detaching from the tensioning plate 23.

[0042] This application embodiment also provides an early warning system, including a bracket 200 and a positioning device 100 of any of the above embodiments, wherein the positioning device 100 is disposed on the bracket 200.

[0043] The early warning system provided in this application includes the positioning device 100 of any of the above embodiments, and therefore has all the above-mentioned beneficial effects, which will not be repeated here.

[0044] In one exemplary embodiment, the bracket 200 is provided with a rotating shaft 201, and the connecting sleeve 111 of the positioning device 100 is sleeved on the rotating shaft 201 and configured to rotate around the rotating shaft 201. Figure 3 , Figure 4 , Figure 8 as well as Figure 9 As shown.

[0045] The bracket 200 is provided with a tray 202, which is used to place the positioning device 100 and the roll material 500. The bracket 200 and the tray 202 are fixedly connected. The inner wall of the connecting sleeve 111 abuts against the outer wall of the rotating shaft 201. The bracket 200 and the tray 202 are fixed on the edge-wrapping equipment.

[0046] In this way, the bracket 200 and the pallet 202 do not rotate with the positioning device 100 and the roll 500. The pallet 202 can support the positioning device 100 and the roll 500, which improves the support reliability of the overall structure. The connecting sleeve 111 is rotatably connected to the rotating shaft 201 and the inner wall of the connecting sleeve 111 abuts against the outer wall of the rotating shaft 201, which can guide and limit the movement of the positioning device 100. In this way, the positioning device 100 will not move radially on the bracket 200, which further enhances the stability of the rotation of the positioning device 100 and the roll 500.

[0047] In one exemplary embodiment, the early warning system further includes a counter 300, a timer, an alarm device, and a control device.

[0048] The counter 300 is configured to count the number of rotations of the positioning device 100. A counting sensor 400 is located at the bottom of the positioning device 100. The counter 300 is mounted on the bracket 200 and positioned on the circumference of the rotation path of the counting sensor 400. The counting sensor 400 is configured to trigger the counter 300 to count when it rotates to a position opposite to the counter 300. Figure 2 , Figure 5 as well as Figure 7 As shown.

[0049] The timer is configured to time the time it takes for the positioning device 100 to rotate one revolution.

[0050] The counter 300, timer, and alarm device are all electrically connected to the control device. The control device is configured to trigger the alarm when the counter 300 reaches a preset number of cycles and when the timer reaches a preset duration. The alarm device can be, but is not limited to, a buzzer or an alarm light.

[0051] In this way, the alarm device is placed near the workers, and the roll material 500 is fixedly connected to the positioning device 100. When the equipment is running, the roll material 500 rotates along with the movement of the plasterboard. The rotation of the roll material 500 directly drives the positioning device 100 to rotate synchronously. The counter 300 scans the counting sensor 400 in real time. Every time the roll material 500 rotates once, the counter 300 completes a corresponding scan with the counting sensor 400 and records a count unit. While the counter 300 is recording the number of rotations, the timer simultaneously counts the time interval between two adjacent counts (i.e., the time it takes for the positioning device 100 to rotate once). The counter 300 also continuously accumulates the number of rotations of the binding paper. When the roll material 500 breaks, its rotation will stop, the positioning device 100 will also stop rotating, the counter 300 will no longer be able to scan the signal of the counting sensor 400, and the time period between two adjacent counts of the timer will exceed the preset threshold. At this time, the timer will trigger the alarm device to sound an alarm, indicating that the binding paper has broken. Since there is a fixed correspondence between the total length of the roll 500 and the length of a single turn, the total number of turns corresponds to the total usage of the roll 500. When the cumulative value of the counter 300 reaches the preset total number of turns threshold, it is determined that the roll 500 has been used up, and the alarm device is triggered to remind the operator to replace the edge wrapping paper in time.

[0052] This application also provides a gypsum board edging system, including the early warning system of any of the above embodiments.

[0053] The gypsum board edging system provided in this application includes the early warning system of any of the above embodiments, and therefore has all the above-mentioned beneficial effects, which will not be repeated here.

[0054] In summary, the positioning device 100, early warning system, and gypsum board edge-wrapping system of this application have few components and a simple and compact structure. They can achieve the tensioning and positioning function without complex transmission mechanisms, and are safe, stable, and reliable in operation. The positioning device 100 tightens and positions the roll material 500, and the tensioning force can effectively prevent the roll material 500 from loosening, slipping, or rotating eccentrically during the unwinding process. This ensures that the roll material 500 is pulled smoothly with a constant and stable tension, avoiding edge skewing and wrinkling caused by tension fluctuations. This results in complete gypsum board edge wrapping, improves the appearance of the gypsum board, and increases the yield rate. Furthermore, after the early warning system is put into use, it can promptly issue an alarm when the edge wrapping paper breaks or runs out, allowing staff to handle the problem in a timely manner, ensuring the integrity of the packaging, and reducing the labor intensity of the staff. Of course, staff can perform other tasks simultaneously while the equipment is running, improving work efficiency.

[0055] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and 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 of this application.

[0056] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0057] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0058] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0059] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0060] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A positioning device, characterized in that, include: A support assembly, comprising a support member and a movable member, wherein the support member has a connecting member, and the movable member is sleeved on the connecting member and configured to move axially along the connecting member; and A positioning sleeve is fitted onto the outside of the support assembly, and at least one of the support member and the movable member is provided with a pressing surface. The positioning sleeve is provided with a pressure-receiving surface that cooperates with the pressing surface. At least one of the pressing surface and the pressure-receiving surface is an inclined surface that is inclined relative to the axial direction of the connector. The positioning sleeve is configured such that, when the movable member moves axially along the connector, it expands radially along the connector under the compression fit of the extrusion surface and the pressure-bearing surface, so as to form a tightened positioning with the roll material sleeved on the outside of the positioning sleeve.

2. The positioning device according to claim 1, characterized in that, The extrusion surface includes a first extrusion surface that is annular on the outside of the support member and a second extrusion surface that is annular on the outside of the movable member. Both the first extrusion surface and the second extrusion surface are tapered slopes, and the tapered tips of the first extrusion surface and the second extrusion surface are opposite to each other. The pressure-bearing surface includes a first pressure-bearing surface and a second pressure-bearing surface disposed on the inner side of the positioning sleeve, wherein the first pressure-bearing surface is configured to be adapted to and press-fit with the first extrusion surface, and the second pressure-bearing surface is configured to be adapted to and press-fit with the second extrusion surface.

3. The positioning device according to claim 2, characterized in that, The first extrusion surface and the second extrusion surface have the same inclination angle relative to the axial direction of the connector.

4. The positioning device according to claim 1, characterized in that, Also includes: A driving element, configured to drive the movable element to move axially along the connecting element; and A first elastic element is disposed between the movable element and the support element.

5. The positioning device according to claim 4, characterized in that, The driving component is sleeved on the outside of the connecting component and threadedly connected to the connecting component. The driving component abuts against the end of the movable component that is away from the first elastic component.

6. The positioning device according to claim 4, characterized in that, The connector is a connecting sleeve with a central hole, the support and the connector are an integral structure, and the first elastic element is a spring and is sleeved on the outside of the connecting sleeve.

7. The positioning device according to any one of claims 1 to 6, characterized in that, The positioning sleeve is an expansion sleeve, which includes a plurality of expansion plates distributed circumferentially along the support assembly and at least one second elastic element sleeved outside the plurality of expansion plates, each of the expansion plates having the pressure-bearing surface.

8. An early warning system, characterized in that, include: bracket; and The positioning device according to any one of claims 1 to 7 is disposed on the bracket.

9. The early warning system according to claim 8, characterized in that, The bracket is provided with a rotating shaft, and the connecting sleeve of the positioning device is sleeved on the rotating shaft and configured to rotate around the rotating shaft.

10. The early warning system according to claim 9, characterized in that, Also includes: A counter configured to count the number of rotations of the positioning device; A timer is configured to time the rotation of the positioning device in one revolution. Alarm device; and The control device includes a counter, a timer, and an alarm device, all electrically connected to the control device. The control device is configured to trigger an alarm when the counter reaches a preset number of cycles and when the timer reaches a preset duration. 。 11. A gypsum board edging system, characterized in that, The warning system includes any one of claims 8 to 10.

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