Ladder with lateral stabilizing structure

Abstract

The utility model provides a kind of ladder with lateral stabilizing structure, it is related to ladder field, including connecting plate, ladder bar and fixed sleeve frame;The upper side and lower side of ladder bar are all welded with slide column;The front side and rear side of connecting plate are all hinged with turnover plate, the left side and right side of connecting plate are all hinged with fixed diagonal, the outside of fixed diagonal is slidably connected with telescopic diagonal, the outside of telescopic diagonal is slidably connected with turnover sliding sleeve, and the outside of turnover sliding sleeve is hinged with shrinkage plate;The upper side of fixed sleeve frame is screwed with screw lock bar, and the top of screw lock bar is welded with lock knob;By the setting of telescopic diagonal, fixed sleeve frame, screw lock bar and slide column, not only the stability of ladder erecting and placing structure is improved, but also the structure of ladder is reduced and stored, the problem that traditional ladder does not have lateral supporting structure, which leads to poor stability of ladder supporting and placing, and the problem that ladder does not have telescopic storage structure, which causes inconvenience in carrying ladder are solved.

Description

Technical Field

[0001] This utility model belongs to the field of A-frame ladders, and more specifically, it relates to an A-frame ladder with a lateral stabilizing structure. Background Technology

[0002] A-frame ladders are tools used for climbing and other work in elevated spaces, such as during renovations, and are widely used in homes and construction. Currently, traditional A-frame ladders form an A-shape with a hinged top, relying on the friction between the feet and the ground for balance. However, they pose potential hazards in the following situations:

[0003] 1. It is prone to tilting when the ground is uneven;

[0004] 2. When the user performs lateral operations (such as high-altitude maintenance), the shift in the center of gravity causes swaying;

[0005] 3. When the ladder is tall, its lateral wind resistance is weak;

[0006] Therefore, some ladders improve stability by widening the legs or adding horizontal connecting rods, but this sacrifices portability. Thus, there is an urgent need for a solution that enhances lateral support without compromising folding and storage. Utility Model Content

[0007] To address the aforementioned technical problems, this utility model provides an A-frame ladder with a lateral stabilizing structure, thereby solving the problems of poor stability when placed on traditional A-frame ladders due to the lack of a lateral support structure and the inconvenience of carrying A-frame ladders due to the lack of a telescopic storage structure.

[0008] This utility model provides an A-frame ladder with a laterally stable structure, including a base pad; a telescopic diagonal rod is glued to the top of the base pad; it also includes a connecting plate, a locking ladder frame, a telescopic ladder frame, and a fixed sleeve; the telescopic ladder frame includes a ladder rod and a sliding column; a foot pad is glued to the upper side of the ladder rod, and sliding columns are welded to both the upper and lower sides of the ladder rod; a flip plate is hinged to the front and rear sides of the connecting plate, and a sliding column is welded to the lower side of the flip plate; a fixed diagonal rod is hinged to the left and right sides of the connecting plate; a telescopic diagonal rod is slidably connected to the outer side of the fixed diagonal rod; a flip sleeve is slidably connected to the outer side of the telescopic diagonal rod; a retractable plate is hinged to the outer side of the flip sleeve; a connecting rod is hinged to the front and rear sides of the fixed sleeve, and a ladder rod is hinged to the other end of the connecting rod; a threaded locking rod is screwed to the upper side of the fixed sleeve, and a locking knob is welded to the top of the threaded locking rod.

[0009] In at least some embodiments, the locking ladder frame includes a sleeve, a foot rod, a pressure block, a slide, a turntable, an unlocking knob, a locking spring, a partition, a pull rod, a support rod, and a push column; a foot pad is glued to the upper side of the foot rod, and a sleeve is welded to both the left and right ends of the foot rod. The outer side of the sleeve has a rectangular through groove running from left to right. The foot rod is a rectangular cylindrical structure running from left to right. A through hole is provided on the rear side of the cylindrical structure of the foot rod, and an unlocking knob is rotatably connected inside the through hole of the foot rod. A rotating part is welded to the front side of the unlocking knob. The disc has two sets of pushing columns welded to its front side. Each set of pushing columns is cylindrical and symmetrically distributed on the left and right sides. The outer side of the partition is welded with a foot rod. The center of the partition has a through hole that runs from left to right. A pull rod is inserted through the through hole in the center of the partition. A pressure block is welded to one end of the pull rod. Support rods are welded to the upper and lower sides of the pressure block. A slide is welded to the other end of the pull rod. There are two sets of locking springs. One end of the locking spring is welded with a partition, and the other end of the locking spring is welded with a pressure block.

[0010] In at least some embodiments, the number of sliding pillars is four sets, with each pair of sliding pillars symmetrically distributed left and right. Each set of sliding pillars has a U-shaped groove structure. The inner side of the U-shaped groove structure of the sliding pillar is provided with a groove, and the outer side of the U-shaped groove structure of the sliding pillar is provided with a protrusion. The protrusion of the sliding pillar is embedded in the rectangular through groove of the insert.

[0011] In at least some embodiments, the number of carriages is two sets, each set of carriages is an L-shaped structure, the front side of the carriage is provided with a long through groove, and the two sets of pushing columns are respectively inserted into the long through groove of the carriage.

[0012] In at least some embodiments, the fixing sleeve is a rectangular cylindrical structure that runs through the left and right sides. Two sets of shrink plates are embedded on the inner side of the rectangular cylindrical structure of the fixing sleeve. There are two sets of shrink plates. The upper side of each set of shrink plates is provided with ten sets of through holes. The upper side of the fixing sleeve is provided with two sets of protruding pillars. The center of each set of protruding pillars is provided with a threaded through hole that runs through the top and bottom. The outer side of the threaded locking rod is threadedly engaged with the through hole of the fixing sleeve.

[0013] In at least some embodiments, the telescopic diagonal rods are in two sets, each set being a cuboid shell structure with an open top. A fixed diagonal rod is inserted into the inner side of the shell structure of the telescopic diagonal rod. The outer side of the fixed diagonal rod has eleven sets of through holes. A circular through hole is provided near the bottom of the inner side of the telescopic diagonal rod. A cylindrical shell structure is provided on the outer side of the telescopic diagonal rod. A through hole is provided at the right end of the cylindrical shell structure of the telescopic diagonal rod. A locking rod is inserted into the circular through hole of the telescopic diagonal rod. A limit ring plate is welded to the outer side of the locking rod. A push spring is welded to the limit ring plate. The other end of the push spring is welded to the inner side of the cylindrical shell structure of the telescopic diagonal rod.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. In this utility model, on the one hand, the elastic force of the push spring itself drives the locking rod to penetrate into the through hole of the fixed diagonal rod to fix the telescopic length of the telescopic diagonal rod. On the other hand, the threaded engagement structure of the threaded locking rod in the threaded through hole of the fixed sleeve column allows the threaded locking rod to move horizontally and limit the shrink plate in the through hole of the shrink plate. This allows the shrink plate to expand and support the telescopic diagonal rod by flipping the sliding sleeve, thus realizing the telescopic diagonal support structure on both sides of the A-frame ladder and improving the stability of the A-frame ladder installation structure.

[0016] 2. In the utility model, the sliding structure of the sliding column protrusion in the long through groove of the insert sleeve and the support locking structure of the support rod in the groove of the sliding column U-shaped groove structure enable the telescopic ladder frame to perform telescopic sliding and support locking work on the upper and lower sides of the locking ladder frame. This not only realizes the rapid unfolding and locking of the ladder frame according to the construction height, but also enables the A-frame ladder structure to be reduced in size and stored, reducing the overall volume of the A-frame ladder during the carrying process, making it easier for construction personnel to carry and move. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a front view structural diagram of this utility model.

[0019] Figure 3 This is a cross-sectional structural diagram of the present invention.

[0020] Figure 4 This is the utility model Figure 3 Enlarged structural diagram of part A in the middle.

[0021] Figure 5 This is the utility model Figure 3 Enlarged structural diagram of part B in the middle.

[0022] Figure 6 This is the utility model Figure 3 Enlarged structural diagram of part C in the middle.

[0023] Figure 7 This is a schematic diagram of the locking ladder frame structure of this utility model.

[0024] Figure 8 This is a cross-sectional schematic diagram of the locking ladder frame of this utility model.

[0025] Figure 9 This is a schematic diagram of the rear side view of the locking ladder frame of this utility model.

[0026] Figure 10 This is a schematic diagram of the telescopic ladder frame structure of this utility model.

[0027] Figure 11 This is a cross-sectional structural diagram of the telescopic ladder frame of this utility model.

[0028] Figure label:

[0029] 1. Telescopic diagonal brace;

[0030] 2. Base mat;

[0031] 3. Flip the sliding sleeve;

[0032] 4. Limiting ring plate;

[0033] 5. Connecting plate;

[0034] 6. Flip-up plate;

[0035] 7. Foot pads;

[0036] 8. Locking ladder frame; 801. Insert sleeve; 802. Leg bar; 803. Pressure block; 804. Slide; 805. Turntable; 806. Unlocking knob; 807. Locking spring; 808. Partition; 809. Pull rod; 810. Support rod; 811. Push column;

[0037] 9. Telescopic ladder frame; 901. Ladder rod; 902. Sliding column;

[0038] 10. Shrink flap;

[0039] 11. Fixed bracket;

[0040] 12. Connecting rod;

[0041] 13. Locking knob;

[0042] 14. Threaded locking rod;

[0043] 15. Lock the insertion rod;

[0044] 16. Push spring;

[0045] 17. Fix the diagonal brace. Detailed Implementation

[0046] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of this utility model.

[0047] like Figures 1-11As shown, this utility model provides an A-frame ladder with a laterally stable structure, including a base pad 2; a telescopic diagonal rod 1 is glued to the top of the base pad 2; it also includes a connecting plate 5, a locking ladder frame 8, a telescopic ladder frame 9, and a fixing sleeve 11; the telescopic ladder frame 9 includes a ladder rod 901 and a sliding column 902; a foot pad 7 is glued to the upper side of the ladder rod 901, and sliding columns 902 are welded to both the upper and lower sides of the ladder rod 901; a flip plate 6 is hinged to both the front and rear sides of the connecting plate 5, and a sliding column is welded to the lower side of the flip plate 6. 902, the left and right sides of the connecting plate 5 are both hinged with fixed diagonal rods 17, the outer side of the fixed diagonal rod 17 is slidably connected with telescopic diagonal rod 1, the outer side of the telescopic diagonal rod 1 is slidably connected with a flip-up sliding sleeve 3, the outer side of the flip-up sliding sleeve 3 is hinged with a shrink plate 10; the front and rear sides of the fixed sleeve 11 are both hinged with connecting rods 12, the other end of the connecting rod 12 is hinged with a ladder rod 901, the upper side of the fixed sleeve 11 is screwed with a threaded locking rod 14, and the top of the threaded locking rod 14 is welded with a locking knob 13.

[0048] In this embodiment, the locking ladder frame 8 includes a sleeve 801, a foot rod 802, a pressure block 803, a slide 804, a turntable 805, an unlocking knob 806, a locking spring 807, a partition 808, a pull rod 809, a support rod 810, and a push column 811; a foot pad 7 is glued to the upper side of the foot rod 802; a sleeve 801 is welded to both the left and right ends of the foot rod 802; the outer side of the sleeve 801 is provided with a rectangular section that runs through the left and right sides. The foot rod 802 is a rectangular cylindrical structure that runs horizontally through the groove. A through hole is provided on the rear side of the cylindrical structure of the foot rod 802. An unlocking knob 806 is rotatably connected inside the through hole of the foot rod 802. A turntable 805 is welded to the front side of the unlocking knob 806. Two sets of pushing columns 811 are welded to the front side of the turntable 805. Each set of pushing columns 811 is a cylindrical structure, and the pushing columns 811 are symmetrically distributed horizontally. The outer side of the partition plate 808... A foot rod 802 is welded on. A through hole is provided in the center of the partition 808, and a pull rod 809 is inserted in the center through hole of the partition 808. A pressure block 803 is welded to one end of the pull rod 809. A support rod 810 is welded to the upper and lower sides of the pressure block 803. A slide 804 is welded to the other end of the pull rod 809. There are two sets of locking springs 807. A partition 808 is welded to one end of the locking spring 807, and a pressure block 803 is welded to the other end of the locking spring 807. The locking spring 807 drives the support rod 810 welded to the pressure block 803 to automatically penetrate into the groove of the slide column 902, so that the support rod 810 fits against the bottom of the groove of the slide column 902. The support rod 810 locks the slide column 902 at the upper and lower limits, and completes the extension and locking work of the two sets of telescopic ladder frames 9 on the upper and lower sides of the locking ladder frame 8.

[0049] In this embodiment, there are four sets of sliding columns 902, with each pair of sliding columns 902 symmetrically distributed from left to right. Each set of sliding columns 902 has a U-shaped groove structure. The inner side of the U-shaped groove structure of the sliding column 902 is provided with a groove, and the outer side of the U-shaped groove structure of the sliding column 902 is provided with a protrusion. The protrusion of the sliding column 902 is embedded in the rectangular through groove of the insert 801, so that the sliding column 902 slides and extends in a directional manner along the rectangular through groove of the insert 801, changing the combined length of the telescopic ladder frame 9 and the locking ladder frame 8, which facilitates the retraction and carrying of the A-frame ladder.

[0050] In this embodiment, there are two sets of slides 804, each set of slides 804 is an L-shaped structure, and the front side of the slide 804 is provided with a long through groove. Two sets of pushing columns 811 are respectively inserted into the long through groove of the slide 804. During the process of the turntable 805 driving the two sets of pushing columns 811 to rotate around the horizontal central axis of the turntable 805, the pushing columns 811 push the groove wall of the long through groove of the slide 804, so that the two sets of pushing slides 804 drive the pressure block 803 to slide left and right in opposite directions through the pull rod 809. The pressure block 803 drives the support rod 810 to disengage from the groove structure of the slide column 902, thus completing the unlocking work of the support rod 810 from the slide column 902.

[0051] In this embodiment, the fixing sleeve 11 is a rectangular cylindrical structure that extends from left to right. Two sets of contraction plates 10 are embedded on the inner side of the rectangular cylindrical structure of the fixing sleeve 11. There are two sets of contraction plates 10, and each set of contraction plates 10 has ten through holes on its upper side. Two sets of protruding pillars are provided on the upper side of the fixing sleeve 11. A threaded through hole extends vertically from the center of each protruding pillar. The outer side of the threaded locking rod 14 is threadedly engaged with the through hole of the fixing sleeve 11. The locking knob 13 drives the threaded... During the rotation of the locking rod 14, the threaded locking rod 14 is inserted into the through hole of the shrink plate 10. The threaded locking rod 14 limits the horizontal movement of the shrink plate 10 within the through hole of the shrink plate 10. The ten sets of through holes of the shrink plate 10 are sequentially connected to the protruding threaded through holes of the fixed sleeve 11, changing the extension length of the shrink plate 10. This allows the shrink plate 10 to push the telescopic diagonal rod 1, which is inserted into the inner side of the flipping slide sleeve 3, to change the angle between the telescopic diagonal rod 1 and the ground according to the slope of the ground, so as to adapt to the scene of slope or soft ground.

[0052] In this embodiment, there are two sets of telescopic diagonal rods 1. Each set of telescopic diagonal rods 1 is a cuboid shell structure with an open top. A fixed diagonal rod 17 is inserted into the inner side of the shell structure of the telescopic diagonal rod 1, allowing the telescopic diagonal rod 1 to retract and slide outside the fixed diagonal rod 17, reducing the combined length of the telescopic diagonal rod 1 and the fixed diagonal rod 17, making it easier to carry when the A-frame ladder is retracted. The outer side of the fixed diagonal rod 17 has eleven sets of through holes. The inner side of the telescopic diagonal rod 1 has a circular through hole near the bottom. The outer side of the telescopic diagonal rod 1 has a cylindrical shell structure. The right end of the structure is provided with a through hole. A locking rod 15 is inserted into the circular through hole of the telescopic diagonal rod 1. A limit ring plate 4 is welded to the outer side of the locking rod 15. A push spring 16 is welded to the limit ring plate 4. The other end of the push spring 16 is welded to the inner side of the cylindrical shell structure of the telescopic diagonal rod 1. The push spring 16 pushes the limit ring plate 4 structure on the outer side of the locking rod 15 through its own elasticity, so that the locking rod 15 automatically penetrates into the through hole of the fixed diagonal rod 17, thus completing the locking and fixing work of the locking rod 15 on the telescopic diagonal rod 1 at the telescopic position outside the fixed diagonal rod 17.

[0053] The specific usage and function of this embodiment are as follows:

[0054] When the A-frame ladder is being supported, unfolded, and placed, the telescopic ladder frame 9 is manually pulled according to the construction height. When the grooves of the sliding columns 902 of the two sets of telescopic ladder frames 9 are aligned with the support rods 810 of the locking ladder frame 8, the two sets of locking springs 807 push the two sets of pressure blocks 803 to move apart in opposite directions through their own elasticity. The support rods 810, which are welded to the pressure blocks 803, penetrate into the grooves of the sliding columns 902. At this time, the ends of the support rods 810 are in contact with the grooves of the sliding columns 902, thus completing the telescopic unfolding and locking of the upper and lower sides of the ladder frame 8. Then, the locking rod 15 is manually pulled, and the locking rod 15 disengages from the through hole near the top of the fixed inclined rod 17. The structure is as follows: First, pull the telescopic diagonal rod 1 downwards along the fixed diagonal rod 17, so that the inner through hole of the telescopic diagonal rod 1 aligns with the through hole of the fixed diagonal rod 17 at the corresponding support height position. Then, release the locking rod 15, which is inserted into the circular through hole of the fixed diagonal rod 17 at the corresponding position under the elastic action of the push spring 16, so that the telescopic diagonal rod 17 and the telescopic diagonal rod 1 maintain a fixed telescopic length. Then, manually pull the shrink plate 10 according to the tilt support angle of the telescopic diagonal rod 1, so that the ten sets of through holes of the shrink plate 10 move and align with the protruding threaded through holes of the fixed sleeve 11 in sequence. The shrink plate 10 drives the telescopic diagonal rod 1 to flip through the flipping sliding sleeve 3. After the telescopic diagonal rod 1 is adjusted to a suitable support angle, manually turn the locking knob. 13. The locking knob 13 drives the threaded locking rod 14 to penetrate into the through hole of the shrink plate 10. The threaded locking rod 14 provides horizontal support and limit for the shrink plate 10, thus completing the support and unfolding of the A-frame ladder. If it is necessary to shrink and store the A-frame ladder, first pull the locking rod 15. The locking rod 15 disengages from the through hole structure of the fixed inclined rod 17. Then pull the telescopic inclined rod 1 to move upward along the fixed inclined rod 17 until the locking rod 15 aligns with the through hole near the top of the fixed inclined rod 17. Then release the locking rod 15. Under the elastic action of the push spring 16, the locking rod 15 inserts into the circular through hole near the top of the fixed inclined rod 17. Then rotate the locking knob 13 in the opposite direction. The locking knob 13 drives the threaded locking rod. 14. Disengage the shrink plate 10 from the through hole, then manually pull the shrink plate 10 deeper into the inside of the fixed sleeve 11. The two sets of shrink plates 10 respectively drive the two sets of telescopic diagonal rods 1 to flip inward through the flipping slide sleeve 3. Finally, manually turn the unlocking knob 806. The unlocking knob 806 drives the two sets of pushing columns 811 welded to the turntable 805 to push the long through groove structure of the two sets of slides 804 respectively. This causes the two sets of slides 804 to move towards each other from left to right through the pull rod 809, causing the support rod 810 welded to the pressure block 803 to disengage from the groove structure of the slide column 902. This allows the slide column 902 to slide into the inside of the insert sleeve 801 along the long through groove, completing the shrinking and storage of the A-frame ladder.

[0055] All the above components are installed, connected, or set up using common mechanical methods, such as welding, threaded connections, and screw connections. Furthermore, the specific structure, model, and coefficient specifications of all components are based on their own technologies, and any method that achieves the desired effect can be implemented. The foot pads 7 mentioned above are common market components; upon purchase and use, simply connect them according to the instruction manual purchased with the product, and therefore will not be elaborated upon further.

[0056] The technical solution of this utility model is not limited to the scope of the embodiments of this utility model. All technical contents not described in detail in this utility model are known technologies.

Claims

1. A type of ladder with a laterally stabilizing structure, comprising a base pad (2); a telescopic diagonal bar (1) is bonded to the top of the base pad (2); characterized in that: It also includes a connecting plate (5), a locking ladder frame (8), a telescopic ladder frame (9), and a fixing sleeve (11); the telescopic ladder frame (9) includes a ladder rod (901) and a sliding column (902); a foot pad (7) is glued to the upper side of the ladder rod (901), and a sliding column (902) is welded to both the upper and lower sides of the ladder rod (901); a flip plate (6) is hinged to both the front and rear sides of the connecting plate (5), and a sliding column (902) is welded to the lower side of the flip plate (6); a sliding column (902) is hinged to both the left and right sides of the connecting plate (5). A fixed diagonal rod (17) is slidably connected to a telescopic diagonal rod (1) on its outer side. A flip-up sliding sleeve (3) is slidably connected to the outer side of the telescopic diagonal rod (1). A shrink plate (10) is hinged to the outer side of the flip-up sliding sleeve (3). A connecting rod (12) is hinged to both the front and rear sides of the fixed sleeve (11). A ladder rod (901) is hinged to the other end of the connecting rod (12). A threaded locking rod (14) is screwed onto the upper side of the fixed sleeve (11). A locking knob (13) is welded to the top of the threaded locking rod (14).

2. The A-frame ladder with a laterally stable structure as described in claim 1, characterized in that: The locking ladder frame (8) includes a sleeve (801), a foot rod (802), a pressure block (803), a slide (804), a turntable (805), an unlocking knob (806), a locking spring (807), a partition (808), a pull rod (809), a support rod (810), and a push column (811). A foot pad (7) is attached to the upper side of the foot rod (802). Sleeves (801) are welded to both the left and right ends of the foot rod (802). The outer side of the sleeve (801) has a rectangular through-slot. The foot rod (802) is a rectangular cylindrical structure that runs horizontally through the left and right sides. A through hole is provided on the rear side of the cylindrical structure of the foot rod (802). An unlocking knob (806) is rotatably connected inside the through hole of the foot rod (802). A turntable (807) is welded to the front side of the unlocking knob (806). 5) Two sets of pushing columns (811) are welded to the front side of the turntable (805). Each set of pushing columns (811) is a cylindrical structure and the pushing columns (811) are symmetrically distributed on the left and right sides. The outer side of the partition (808) is welded with a foot rod (802). The center of the partition (808) is provided with a through hole that runs through the left and right sides. A pull rod (809) is inserted into the through hole in the center of the partition (808). A pressure block (803) is welded to one end of the pull rod (809). A support rod (810) is welded to the upper and lower sides of the pressure block (803). A slide (804) is welded to the other end of the pull rod (809). There are two sets of locking springs (807). One end of the locking spring (807) is welded with a partition (808), and the other end of the locking spring (807) is welded with a pressure block (803).

3. The A-frame ladder with a laterally stable structure as described in claim 1, characterized in that: The number of sliding columns (902) is four sets, with each pair of sliding columns (902) symmetrically distributed on the left and right. Each set of sliding columns (902) has a U-shaped groove structure. The inner side of the U-shaped groove structure of the sliding column (902) is provided with a groove, and the outer side of the U-shaped groove structure of the sliding column (902) is provided with a protrusion. The protrusion of the sliding column (902) is embedded in the rectangular through groove of the insert (801).

4. The A-frame ladder with a laterally stable structure as described in claim 2, characterized in that: The number of the slides (804) is two sets, each set of slides (804) is an L-shaped structure, the front side of the slides (804) is provided with a long through groove, and the two sets of push columns (811) are respectively inserted into the long through groove of the slides (804).

5. The A-frame ladder with a laterally stable structure as described in claim 1, characterized in that: The fixed sleeve (11) is a rectangular cylindrical structure that runs through the left and right sides. Two sets of shrink plates (10) are embedded on the inner side of the rectangular cylindrical structure of the fixed sleeve (11). There are two sets of shrink plates (10). Each set of shrink plates (10) has ten sets of through holes on its upper side. The upper side of the fixed sleeve (11) has two sets of protruding pillars. Each set of protruding pillars has a threaded through hole running vertically at its center. The threaded locking rod (14) is threadedly engaged with the outer side of the fixed sleeve (11) in the through hole.

6. The A-frame ladder with a laterally stable structure as described in claim 1, characterized in that: The telescopic diagonal rods (1) are in two sets. Each set of telescopic diagonal rods (1) is a cuboid shell structure with an open top. A fixed diagonal rod (17) is inserted into the inner side of the shell structure of the telescopic diagonal rod (1). The outer side of the fixed diagonal rod (17) is provided with eleven sets of through holes. A circular through hole is provided near the bottom of the inner side of the telescopic diagonal rod (1). A cylindrical shell structure is provided on the outer side of the telescopic diagonal rod (1). A through hole is provided at the right end of the cylindrical shell structure of the telescopic diagonal rod (1). A locking rod (15) is inserted into the circular through hole of the telescopic diagonal rod (1). A limit ring plate (4) is welded to the outer side of the locking rod (15). A push spring (16) is welded on the limit ring plate (4). The other end of the push spring (16) is welded to the inner side of the cylindrical shell structure of the telescopic diagonal rod (1).

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