An adjustable length diagonal brace, scissor brace and scaffolding

Abstract

This utility model provides a length-adjustable tie rod, scissor brace, and scaffolding, including a fixed rod and a movable rod. The near end of the fixed rod has an inner hole for the movable rod to be inserted, and the fixed rod and the movable rod slide in the axial direction of the two. A locking device is provided between the fixed rod and the movable rod. The locking device can switch between a locked state and an unlocked state to infinitely lock or unlock the depth of the movable rod inserted into the fixed rod. Thus, when it is necessary to adjust the length of the tie rod, simply switch the locking device to the unlocked state, infinitely adjust the depth of the movable rod inserted into the fixed rod as needed, and then switch the locking device to the locked state to fix the relative position of the fixed rod and the movable rod. This effectively solves the drawback of existing tie rods that cannot achieve infinite adjustment and greatly improves the application range of tie rods.

Description

Technical Field

[0001] This utility model relates to the field of scaffolding technology, and in particular to an adjustable length diagonal brace, scissor brace and scaffolding. Background Technology

[0002] In scaffolding systems, diagonal braces are a key component for ensuring the stability of the scaffold structure. They provide effective lateral restraint and ties, enhancing the overall stability of the scaffolding structure. Currently, there are two main types of diagonal braces. One type uses couplers to overlap or butt-joint multiple steel pipes on-site to form a diagonal brace of the target length. This is not only time-consuming and labor-intensive, affecting the cleanliness of the site, but also makes it difficult to effectively connect the diagonal braces formed by overlapping or butt-jointing steel pipes with the uprights and horizontal bars of the disc-lock scaffolding, affecting the overall stability of the scaffolding. The other type involves custom-fabricating diagonal braces of different lengths so that when the overall size of the scaffolding needs to be adjusted, the corresponding length of diagonal braces can be replaced to accommodate changes in the scaffolding dimensions. In other words, the scaffolding needs to be equipped with a large number of diagonal braces of different lengths to meet the flexible adjustment of the scaffolding dimensions, increasing construction costs and management difficulty.

[0003] To overcome the aforementioned shortcomings, utility model patent CN2023219508867 discloses an adjustable-length socket-type disc-lock scaffolding diagonal brace for civil engineering. It includes an outer rod and an inner rod slidably connected to the inner wall of the outer rod. The inner wall of the outer rod has six sets of positioning holes, and the inner wall of the inner rod has six sets of insertion holes. One set of positioning holes and one set of insertion holes share a common pin, and a socket is installed on the pin. Thus, by simply aligning one set of positioning holes with different sets of insertion holes and fixing them with the pin, the telescopic rod composed of the outer and inner rods can be locked at different lengths to meet the tying requirements of various modular disc-lock scaffolds. However, this solution still has significant limitations. Specifically, the diagonal brace can only be locked at a few preset specific lengths, and continuous length adjustment (i.e., stepless adjustment) is not possible, which is detrimental to meeting the precision requirements of scaffolding construction and greatly limits the application range of the diagonal brace. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the technical problem to be solved by this utility model is to provide a length-adjustable diagonal brace, scissor brace and scaffolding, the diagonal brace of which can realize continuous length adjustment, effectively improving the application range of the diagonal brace.

[0005] To achieve the above objectives, this utility model provides a length-adjustable tie rod, including a fixed rod and a movable rod. The near end of the fixed rod has an inner hole for the movable rod to be inserted, and the fixed rod and the movable rod slide in axial direction. A locking device is provided between the fixed rod and the movable rod. The locking device can switch between a locked state and an unlocked state to infinitely lock or unlock the depth of the movable rod inserted into the fixed rod. Thus, when the length of the tie rod needs to be adjusted, simply switch the locking device to the unlocked state, infinitely adjust the depth of the movable rod inserted into the fixed rod as needed, and then switch the locking device to the locked state to fix the fixed rod and the movable rod relative to each other. This effectively solves the drawback of existing tie rods that cannot achieve infinitely adjustable length, greatly improving the application range of the tie rod.

[0006] Preferably, the locking device includes a sliding sleeve and a plurality of grippers evenly distributed along the center of the sliding sleeve; the plurality of grippers are located in the inner hole of the fixed rod, and each gripper is fixedly connected to the sliding sleeve threaded to the outside of the fixed rod; the proximal end of the movable rod can sequentially pass through the clamping cavity formed by the sliding sleeve and the plurality of grippers and enter the inner hole of the fixed rod; the inner hole has an inner conical surface that gradually decreases in size towards the proximal end, and the grippers have an outer conical surface that mates with the inner conical surface; when the sliding sleeve rotates to drive each gripper to move towards the proximal end, each gripper moves synchronously radially inward under the constraint of the inner conical surface to grip the movable rod; when the sliding sleeve rotates to drive each gripper to move towards the distal end, each gripper synchronously returns to its original radial direction to release the gripped movable rod.

[0007] Preferably, the locking device includes a sliding sleeve and a plurality of grippers evenly distributed along the center of the sliding sleeve; the plurality of grippers are located in the inner hole of the fixed rod, and each gripper is fixedly connected to the sliding sleeve located outside the fixed rod; the sliding sleeve and the proximal end of the fixed rod are slidably connected in the axial direction of the two; the proximal end of the movable rod can sequentially pass through the clamping cavity formed by the sliding sleeve and the plurality of grippers and enter the inner hole of the fixed rod; the inner hole is provided with limiting members corresponding to each gripper, and each limiting member is provided with a first inclined surface that is inclined inward along the direction near the proximal end, and the gripper is provided with a second inclined surface that cooperates with the corresponding first inclined surface; when the sliding sleeve drives each gripper to move towards the proximal end, each gripper moves radially inward synchronously under the restriction of the corresponding limiting member to clamp the movable rod; when the sliding sleeve drives each gripper to move towards the distal end, each gripper resets radially outward synchronously to release the clamped movable rod.

[0008] Preferably, the first inclined surface is an inclined curved surface or an inclined plane.

[0009] Preferably, each of the first inclined surfaces is connected to form an inner conical surface whose dimensions gradually decrease towards the proximal end.

[0010] Preferably, the locking device includes a rotating sleeve sleeved outside the fixed rod; the rotating sleeve is axially fixed to the fixed rod and can rotate circumferentially relative to the fixed rod; the sliding sleeve is located inside the rotating sleeve and is threadedly connected to the rotating sleeve.

[0011] Preferably, the locking device includes a rotating sleeve threaded onto the outside of the fixed rod; when the rotating sleeve rotates toward the proximal end, the rotating sleeve pushes the sliding sleeve to move so that the jaws on the sliding sleeve grip the movable rod.

[0012] Preferably, two rotating cams are arranged opposite each other in the inner hole of the fixed rod, and the two rotating cams are connected by a rotating frame located outside the fixed rod; the sliding sleeve is provided with a pusher that cooperates with each rotating cam, and the pusher is located in the inner hole of the fixed rod; when the rotating frame drives the rotating cam to rotate to a first angle position, the rotating cam pushes the pusher to move, so that the jaws on the sliding sleeve grip the movable rod; when the rotating cam rotates to the first angle position, the rotating frame and the fixed rod are detachably fixedly connected.

[0013] This utility model also provides a scissor brace, including a support rod, which is formed by connecting at least one of the above-mentioned length-adjustable diagonal braces in sequence; wherein, the two ends of the length-adjustable diagonal braces are connected to different disc buckle nodes, and two adjacent length-adjustable diagonal braces are connected to the same disc buckle node.

[0014] This utility model also provides a scaffold, including the aforementioned scissor bracing.

[0015] As described above, the adjustable-length tie rod, scissor brace, and scaffolding of this utility model have the following beneficial effects:

[0016] The adjustable-length tie rod provided in this application uses a locking device to fix the fixed rod and the movable rod together. When the length of the tie rod needs to be adjusted, simply switch the locking device to the unlocked state to release the relative fixation between the fixed rod and the movable rod, thus easily changing the insertion depth of the movable rod into the fixed rod, achieving stepless adjustment. When the insertion depth of the movable rod reaches the preset requirement, switch the locking device back to the locked state to achieve relative fixation between the movable rod and the fixed rod, completing the length locking after adjustment. The entire adjustment process is convenient and simple, effectively overcoming the shortcomings of traditional tie rods that limit their application range due to the inability to achieve stepless adjustment. In addition, the support rods involved in the scissor bracing and scaffolding of this application are composed of at least one adjustable-length tie rod connected in sequence, and the two ends of the adjustable-length tie rod are connected to different disc buckle nodes, with two adjacent adjustable-length tie rods connected to the same disc buckle node. In this way, the load on the support rod can be quickly distributed through multiple disc buckle nodes, avoiding stress concentration and ensuring the stability of the entire frame. Attached Figure Description

[0017] Figure 1 This is a perspective view of an adjustable length tie rod according to one embodiment of this application.

[0018] Figure 2 for Figure 1 Axial cross-sectional view of the central fixed rod.

[0019] Figure 3 for Figure 1 A perspective view of the locking device.

[0020] Figure 4 This is an axial cross-sectional view of an adjustable-length tie rod in another embodiment.

[0021] Figure 5 for Figure 4 A schematic diagram showing the connection between the middle clamp and the sliding sleeve.

[0022] Figure 6 for Figure 4 A perspective view of the fixing rod in one embodiment.

[0023] Figure 7 for Figure 4 An isometric cross-sectional view of the central fixed rod in one embodiment.

[0024] Figure 8 for Figure 4 A perspective view of the fixing rod in one embodiment.

[0025] Figure 9 This is a perspective view of an adjustable-length tie rod in another embodiment.

[0026] Figure 10 for Figure 9 A schematic diagram of the structure after removing the fixing rod.

[0027] Figure 11 A schematic diagram of scissor bracing installed in the frame.

[0028] Explanation of reference numerals in the attached figures

[0029] Fixed rod 10, inner hole 11, inner conical surface 11a, limiting member 12, first inclined surface 12a, movable rod 20, locking device 30, sliding sleeve 31, gripper 32, outer conical surface 32a, second inclined surface 32b, rotating sleeve 33, rotating cam 34, rotating frame 35, pushed member 36.

[0030] Support rod 100, adjustable length diagonal tie rod 110. Detailed Implementation

[0031] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0032] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of this invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, provided they do not affect the effectiveness or purpose of this invention, should still fall within the scope of the technical content disclosed herein. Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0033] It should also be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or may be connected to an intermediary component. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or indirectly connected to the other component through an intermediary component.

[0034] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0035] This utility model provides a length-adjustable diagonal brace, mainly used in scaffolding. It can achieve stepless adjustment of the length of the diagonal brace according to the longitudinal and transverse spacing of the scaffolding, thus ensuring the stability of the scaffolding.

[0036] like Figure 1As shown, the adjustable length tie rod provided by this utility model includes a fixed rod 10, a movable rod 20, and a locking device 30. The fixed rod 10 has an inner hole 11 at its proximal end for the movable rod 20 to be inserted, and the fixed rod 10 and the movable rod 20 slide in the axial direction of the two to adjust their relative distance. The locking device 30 is disposed between the fixed rod 10 and the movable rod 20, and the locking device 30 can switch between a locked state and an unlocked state to infinitely lock or unlock the depth of the movable rod 20 inserted into the fixed rod 10.

[0037] It should be noted that in this application, the end of the fixed rod 10 that is inserted into the movable rod 20 is the proximal end, and the other end that is far away from each other is the distal end.

[0038] Because the adjustable length tie rod of this application can achieve continuous length adjustment and locking, it effectively improves the adjustment accuracy of the adjustable length tie rod, thereby facilitating the use of scaffolding with different longitudinal and transverse spacings and expanding the application range of the adjustable length tie rod.

[0039] In a preferred embodiment, both the fixed rod 10 and the movable rod 20 are provided with fasteners (not shown in the figure) at their distal ends to facilitate connection with the scaffold frame.

[0040] It should be noted that the fasteners can be various existing connecting fasteners such as steel pipe fasteners or disc fasteners, and there is no limitation on them. In this embodiment, the fasteners are disc fasteners to facilitate the erection of disc fastener scaffolding.

[0041] In an optional embodiment, the fixing rod 10 includes a rod-shaped connecting part and a cylindrical part; wherein, the proximal end of the cylindrical part is for the insertion of the movable rod 20, and the distal end of the cylindrical part is welded to the rod-shaped connecting part; at this time, the diameter of the rod-shaped connecting part is equal to the diameter of the movable rod 20, and a fastener is welded to the distal end of the rod-shaped connecting part and the distal end of the movable rod 20 respectively to ensure the consistency of the welding strength of the two fasteners.

[0042] It is understood that the locking device 30 mentioned above includes, but is not limited to, the following embodiments, as long as it can achieve stepless adjustment and locking of the fixed rod 10 and the movable rod 20.

[0043] Example 1:

[0044] like Figures 1 to 3As shown, the locking device 30 includes a sliding sleeve 31 and a plurality of grippers 32 evenly distributed along the center of the sliding sleeve; the plurality of grippers 32 extend into the inner hole 11 of the fixing rod 10, and each gripper 32 is fixedly connected to the sliding sleeve 31 which is threaded to the outside of the fixing rod 10; the proximal end of the movable rod 20 can pass through the clamping cavity formed by the sliding sleeve 31 and the plurality of grippers 32 in sequence and enter the inner hole 11 of the fixing rod 10; the inner hole 11 has an inner conical surface 11a that gradually decreases in size towards the proximal end, and the grippers 32 have an outer conical surface that mates with the inner conical surface 11a. 32a; When the sliding sleeve 31 rotates to drive each gripper 32 to move towards the proximal end of the fixed rod 10, each gripper 32 moves radially inward synchronously under the constraint of the inner conical surface 11a to grip the movable rod 20, thereby achieving relative fixation between the fixed rod 10 and the movable rod 20; when the sliding sleeve 31 rotates to drive each gripper 32 to move towards the distal end of the fixed rod 10, the constraint effect of the inner conical surface 11a disappears, and each gripper 32 synchronously returns to its radial position to release the gripped movable rod 20, so as to achieve stepless adjustment of the insertion depth of the movable rod 20.

[0045] In a preferred embodiment, the inner hole 11 includes a sliding hole adapted to the outer diameter of the movable rod 20. The sliding hole is located at the far end of the inner conical surface 11a to ensure the sliding stability of the movable rod 20 relative to the fixed rod 10.

[0046] Example 2:

[0047] like Figures 4 to 6 As shown, the locking device 30 includes a sliding sleeve 31 and a plurality of grippers 32 evenly distributed along the center of the sliding sleeve; the plurality of grippers 32 extend into the inner hole 11 of the fixing rod 10, and each gripper 32 is fixedly connected to the sliding sleeve 31 located outside the fixing rod 10; wherein, the sliding sleeve 31 and the proximal end of the fixing rod 10 are slidably connected in the axial direction of the two; the proximal end of the movable rod 20 can pass through the clamping cavity formed by the sliding sleeve 31 and the plurality of grippers 32 in sequence and enter the inner hole 11 of the fixing rod 10; the inner hole 11 is provided with limiting members 12 corresponding to each gripper 32, and each limiting member 12 is provided with a direction along the proximal end of the fixing rod. The first inclined surface 12a is inclined inward, and the gripper 32 is provided with a second inclined surface 32b that cooperates with the corresponding first inclined surface. When the sliding sleeve 31 drives each gripper 32 to move towards the proximal end of the fixed rod 10, each gripper 32 moves radially inward synchronously under the restriction of the corresponding limiting member 12 to hold the movable rod 20, thereby achieving relative fixation between the fixed rod 10 and the movable rod 20. When the sliding sleeve 31 drives each gripper 32 to move towards the distal end of the fixed rod 10, the limiting effect of the limiting member 12 disappears, and each gripper 32 synchronously returns to its radial position to release the held movable rod 20, so as to achieve stepless adjustment of the insertion depth of the movable rod 20.

[0048] It is understandable that the first inclined plane 12a can be an inclined plane or an inclined curved surface, and there are no restrictions on this.

[0049] In a preferred embodiment, the first inclined surface 12a is an inclined curved surface, and each first inclined surface 12a is connected to form an inner conical surface whose size gradually decreases towards the proximal end; compared with machining each first inclined surface 12a separately, machining the inner conical surface is less difficult, less time-consuming and less costly.

[0050] It is understandable that the sliding sleeve 31 and the fixed rod 10 can be slidably connected in the axial direction of the two in the following ways:

[0051] Structural Form 1:

[0052] like Figure 5 and Figure 6 As shown, the limiting member 12 of the fixed rod 10 is provided with an anti-rotation groove that cooperates with the corresponding gripper; the anti-rotation groove is provided so that the corresponding gripper 32 can only move along the axial direction of the fixed rod 10 and cannot rotate relative to the fixed rod 10, thereby ensuring that the sliding sleeve 31 and the fixed rod 10 are slidably connected in the axial direction of the two; at this time, the outermost sidewall of the anti-rotation groove is the first inclined surface 12a.

[0053] Structural Form Two:

[0054] like Figure 5 and Figure 7 As shown, the limiting member 12 of the fixed rod 10 is an anti-rotation groove that cooperates with the corresponding gripper. The anti-rotation groove restricts the corresponding gripper 32 to move only along the axial direction of the fixed rod 10 and prevents it from rotating relative to the fixed rod 10, thereby ensuring that the sliding sleeve 31 and the fixed rod 10 are slidably connected in the axial direction of the two. At this time, the outermost sidewall of the anti-rotation groove is the first inclined surface 12a.

[0055] Structural Form Three:

[0056] like Figure 8 As shown, the limiting member 12 of the fixed rod 10 is a limiting protrusion, and the innermost sidewall of the limiting protrusion is the first inclined surface 12a. At this time, an axial slider (not shown in the figure) can be added to the outer wall of the fixed rod 10, and an axial groove that cooperates with the axial slider can be added to the inner wall of the sliding sleeve 31. Thus, the sliding sleeve 31 and the fixed rod 10 can be slidably connected in the axial direction of the two through the cooperation of the axial slider and the axial groove.

[0057] In the aforementioned locking device 30, when the sliding sleeve 31 slides to the position where each gripper 32 clamps the movable rod 20, the sliding sleeve 31 needs to be locked in position. The methods for locking the sliding sleeve 31 include, but are not limited to, the following:

[0058] Method 1:

[0059] like Figure 4As shown, the locking device 30 includes a rotating sleeve 33 threaded onto the fixed rod 10. When the rotating sleeve 33 rotates and moves towards the near end of the fixed rod, it pushes the sliding sleeve 31 to move so that the grippers 32 on the sliding sleeve 31 grip the movable rod 20. In this way, the position of the sliding sleeve 31 can be locked by the rotating sleeve 33 threaded onto the fixed rod 10. When the rotating sleeve 33 rotates and moves away from the near end of the fixed rod, the position lock of the rotating sleeve 33 on the sliding sleeve 31 is released. Simply moving the sliding sleeve 31 towards the rotating sleeve 33 will cause the grippers 32 to loosen their grip on the movable rod 20, so as to adjust the insertion depth of the movable rod 20.

[0060] Method 2:

[0061] The locking device 30 includes a rotating sleeve 33 sleeved on the outside of the fixed rod 10; the rotating sleeve 33 is axially fixed to the fixed rod 10 and can rotate circumferentially relative to the fixed rod 10; the sliding sleeve 31 is located inside the rotating sleeve 33 and is threadedly connected to the rotating sleeve 33; thus, the axial position of the sliding sleeve 31 can be adjusted and locked simply by rotating the rotating sleeve 33.

[0062] Method 3:

[0063] like Figure 9 and Figure 10 As shown, two rotating cams 34 are arranged opposite each other in the inner hole 11 of the fixed rod 10, and the two rotating cams 34 are connected by a rotating frame 35 located outside the fixed rod 10. The sliding sleeve 31 is provided with a pusher 36 that cooperates with each rotating cam 34. The pusher 36 extends into the inner hole 11 of the fixed rod 10. When the rotating frame 35 drives the rotating cam 34 to rotate to the first angle position, the rotating cam 34 pushes the pusher 36 to move towards the near end of the fixed rod 10, so that each gripper 32 on the sliding sleeve 31 grips the movable rod 20. Then, the rotating frame 35 is detachably fixed to the fixed rod 10 by a binding rope or other structure to complete the position locking. When it is necessary to adjust the length, simply release the lock of the rotating frame 35 and rotate the rotating frame 35 from the first angle position back to the initial angle position. Then move the sliding sleeve 31 away from the near end of the fixed rod, so that each gripper 32 can loosen its grip on the movable rod 20, so as to adjust the insertion depth of the movable rod 20.

[0064] like Figure 11 As shown, this utility model also provides a scissor brace, including a support rod 100, which is formed by sequentially connecting at least one of the aforementioned length-adjustable diagonal braces 110; wherein, the two ends of the length-adjustable diagonal braces 110 are connected to different disc buckle nodes, and two adjacent length-adjustable diagonal braces 110 are connected to the same disc buckle node. In this way, the load on the support rod 100 can be quickly distributed through multiple disc buckle nodes, avoiding stress concentration and ensuring the stability of the entire frame.

[0065] This utility model also provides a scaffolding that includes the aforementioned scissor bracing; in this case, the scaffolding is a disc-lock type scaffolding.

[0066] In summary, this utility model effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0067] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A length-adjustable tie rod, comprising a fixed rod (10) and a movable rod (20); the proximal end of the fixed rod (10) is provided with an inner hole (11) for the movable rod (20) to be inserted, and the fixed rod (10) and the movable rod (20) are slidably engaged in the axial direction of the two; characterized in that, A locking device (30) is provided between the fixed rod (10) and the movable rod (20); the locking device (30) can switch between a locked state and an unlocked state to infinitely lock or unlock the depth of the movable rod (20) inserted into the fixed rod (10).

2. The adjustable length tie rod according to claim 1, characterized in that, The locking device (30) includes a sliding sleeve (31) and a plurality of grippers (32) evenly distributed along the center of the sliding sleeve; the plurality of grippers (32) are located in the inner hole (11) of the fixed rod (10), and each gripper (32) is fixedly connected to the sliding sleeve (31) which is threaded to the outside of the fixed rod (10); the proximal end of the movable rod (20) can pass through the clamping cavity formed by the sliding sleeve (31) and the plurality of grippers (32) in sequence and enter the inner hole (11) of the fixed rod (10); the inner hole (11) has a section extending proximally. The inner conical surface (11a) has a gradually decreasing directional dimension, and the gripper (32) has an outer conical surface (32a) that mates with the inner conical surface (11a). When the sliding sleeve (31) rotates to drive each gripper (32) to move towards the proximal end, each gripper (32) moves radially inward synchronously under the constraint of the inner conical surface (11a) to grip the movable rod (20). When the sliding sleeve (31) rotates to drive each gripper (32) to move towards the distal end, each gripper (32) resets radially outward synchronously to release the gripped movable rod (20).

3. The adjustable length tie rod according to claim 1, characterized in that, The locking device (30) includes a sliding sleeve (31) and a plurality of grippers (32) evenly distributed along the center of the sliding sleeve; the plurality of grippers (32) are located in the inner hole (11) of the fixed rod (10), and each gripper (32) is fixedly connected to the sliding sleeve (31) located outside the fixed rod (10); the sliding sleeve (31) and the proximal end of the fixed rod (10) are slidably connected in the axial direction of the two; the proximal end of the movable rod (20) can pass through the clamping cavity formed by the sliding sleeve (31) and the plurality of grippers (32) in sequence and enter the inner hole (11) of the fixed rod (10); the inner hole (11) Each gripper (32) is provided with a limiting member (12) corresponding to each gripper (32), and each limiting member (12) is provided with a first inclined surface (12a) that is inclined inward in the direction near the proximal end. Each gripper (32) is provided with a second inclined surface (32b) that cooperates with the corresponding first inclined surface. When the sliding sleeve (31) drives each gripper (32) to move in the proximal direction, each gripper (32) moves inward in the same radial direction under the restriction of the corresponding limiting member to hold the movable rod (20). When the sliding sleeve (31) drives each gripper (32) to move in the distal direction, each gripper (32) moves outward in the same radial direction to release the held movable rod (20).

4. The adjustable length tie rod according to claim 3, characterized in that, The first inclined surface (12a) is an inclined curved surface or an inclined plane.

5. The adjustable length tie rod according to claim 3, characterized in that, Each of the first inclined planes (12a) is connected to form an inner conical surface whose size gradually decreases towards the proximal end.

6. A length-adjustable tie rod according to claim 3, 4, or 5, characterized in that, The locking device (30) includes a rotating sleeve (33) sleeved outside the fixed rod (10); the rotating sleeve (33) is axially fixed to the fixed rod (10) and can rotate circumferentially relative to the fixed rod (10); the sliding sleeve (31) is located inside the rotating sleeve (33) and is threadedly connected to the rotating sleeve (33).

7. A length-adjustable tie rod according to claim 3, 4, or 5, characterized in that, The locking device (30) includes a rotating sleeve (33) threaded onto the fixed rod (10); when the rotating sleeve (33) rotates toward the proximal end, the rotating sleeve (33) pushes the sliding sleeve (31) to move so that each claw (32) on the sliding sleeve (31) grips the movable rod (20).

8. A length-adjustable tie rod according to claim 3, 4, or 5, characterized in that, Two rotating cams (34) are arranged opposite each other in the inner hole (11) of the fixed rod (10), and the two rotating cams (34) are connected by a rotating frame (35) located outside the fixed rod (10); the sliding sleeve (31) is provided with a pusher (36) that cooperates with each rotating cam (34), and the pusher (36) is located in the inner hole (11) of the fixed rod (10); when the rotating frame (35) drives the rotating cam (34) to rotate to the first angle position, the rotating cam (34) pushes the pusher (36) to move towards the proximal end, so that each claw (32) on the sliding sleeve (31) grips the movable rod (20); when the rotating cam (34) rotates to the first angle position, the rotating frame (35) and the fixed rod (10) are detachably fixedly connected.

9. A scissor brace, comprising a support rod (100), characterized in that, The support rod (100) is formed by sequentially connecting at least one length-adjustable diagonal brace (110) as described in any one of claims 1 to 5; wherein the two ends of the length-adjustable diagonal brace (110) are connected to different disc buckle nodes, and two adjacent length-adjustable diagonal braces (110) are connected to the same disc buckle node.

10. A type of scaffolding, characterized in that, Including the scissor brace as described in claim 9.

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