Portable crossing frame

Abstract

The invention relates to the field of spanning frames for electric power and communication engineering, and particularly discloses a portable spanning frame which comprises a column body, a first ascending rod, a second ascending rod, a third ascending rod and a fourth ascending rod are arranged in the column body, the portable spanning frame further comprises an inhaul cable mechanism, and the inhaul cable mechanism comprises a hand-operated winch, an external pulley and a built-in pulley block. The built-in pulley block comprises a first built-in pulley, a second built-in pulley, a third built-in pulley, a fourth built-in pulley, a fifth built-in pulley and a sixth built-in pulley, the inhaul cable mechanism further comprises a steel cable, and elastic locking mechanisms are arranged outside the second ascending rod, the third ascending rod, the fourth ascending rod and the column body. The elastic locking mechanism comprises an upper locking hole, a lower locking hole and a lock pin; according to the invention, the four ascending rods are controlled by the hand-operated winch and the steel cables to carry out segmented lifting and telescoping, so that the crossing frame can be lifted to a proper height in a mountain and other areas which are inconvenient to be connected with a power supply, and the crossing frame can be quickly built.

Description

Technical Field

[0001] The present application relates to the field of spanning frames for electric power and communication engineering, and in particular to a portable spanning frame. Background Art

[0002] With the development of national infrastructure construction, power engineering and communication engineering have developed extremely rapidly. High-voltage lines are spread all over the country. During the line construction, whenever there is a crossing railway or a road that cannot be interrupted, in order to ensure that the power lines and communication lines cannot fall to the ground and prevent buildings and greenhouses from being damaged, it is necessary to set up a crossing frame or take other crossing transition measures to ensure the passage of the line. At present, the crossing frame is generally used to solve the transition problem of overhead lines.

[0003] Existing crossing frames can be roughly divided into two categories: vehicle-mounted and built-up. The vehicle-mounted type is to place the crossing frame horizontally on the vehicle body, and then build it by rotating and stretching it after arriving at the predetermined location. This method requires the terrain to at least be able to accommodate vehicles in and out. The built-up type is to assemble it directly on the ground through equipment such as scaffolding, and it is generally built into a spire or a door shape. The above two types of construction have the following defects: 1. It takes a long time to build and is inconvenient to disassemble later; 2. Most of them use exposed cable mechanisms, which are easy to conduct electricity and may cause safety accidents; 3. The support generally relies on the support structure at the bottom, and this single support structure is prone to tipping over.

[0004] The technical problem to be solved by the present application is: how to enable the crossing frame to quickly achieve cable crossing over mountains, slopes or low-lying areas while improving the safety of the crossing frame.

[0005] Application Contents

[0006] In order to overcome the deficiencies of the prior art, the purpose of the present application is to provide a spanning frame which is quick to build, easy to carry and highly safe when in use.

[0007] The technical solution adopted in the present application is: a portable crossing frame, including a column, in which a first lifting rod, a second lifting rod, a third lifting rod and a fourth lifting rod are sequentially installed from top to bottom, and also includes a cable mechanism, the cable mechanism includes a hand-cranked winch, an external pulley and a built-in pulley group, the built-in pulley group includes a first built-in pulley and a fourth built-in pulley respectively fixed at the upper and lower ends of the second lifting rod, a second built-in pulley and a fifth built-in pulley respectively fixed at the upper and lower ends of the third lifting rod, and a third built-in pulley and a sixth built-in pulley respectively fixed at the upper and lower ends of the fourth lifting rod, the cable mechanism also includes a steel cable whose two ends are respectively tied to the hand-cranked winch and the bottom of the first lifting rod, the second lifting rod, the third lifting rod, the fourth lifting rod and the outside of the column are all provided with an elastic locking mechanism, the elastic locking mechanism includes an upper locking hole and a lower locking hole respectively opened on the second lifting rod, the third lifting rod, the fourth lifting rod and the column, and a locking pin elastically matched with them is correspondingly provided outside the upper locking hole and the lower locking hole.

[0008] By shaking the hand-cranked winch, the steel cable is wound and reeled outside it, so as to pull the steel cables outside the fourth built-in pulley, the fifth built-in pulley and the sixth built-in pulley to move upward on the left side and downward on the right side, and the steel cables outside the first built-in pulley, the second built-in pulley and the third built-in pulley to move downward on the left side and upward on the right side, and the first lifting rod is moved upward in the second lifting rod, the second lifting rod is moved upward in the third lifting rod, the third lifting rod is moved upward in the fourth lifting rod, and the fourth lifting rod is moved upward in the column body in sequence, The cross-over frame can be quickly lifted to a suitable height, so that a cable or communication line cross-over frame can be quickly built. The corresponding arrangement of the locking pin and the upper locking hole and the lower locking hole can ensure that when the locking pin is inserted into the upper locking hole, the cross-over frame will not extend out at will during transportation in a retracted state, and when the locking pin is inserted into the lower locking hole, it is ensured that the cross-over frame will not fall down at will after lifting. When it needs to be retracted, it is only necessary to pull out the locking pins outside the column, the fourth lifting rod, the third lifting rod and the second lifting rod in turn, and the cross-over frame can be lowered by its own gravity to complete the storage.

[0009] In some embodiments, the steel cable enters the column through an external pulley and is sequentially wound around the sixth built-in pulley, the third built-in pulley, the fifth built-in pulley, the second built-in pulley, the fourth built-in pulley and the first built-in pulley, and then is tied to the bottom end of the first lifting rod. The hand-cranked winch drives the steel cable to sequentially pull the first lifting rod, the second lifting rod, the third lifting rod and the fourth lifting rod to move upward along the inner wall of the column.

[0010] In some embodiments, the second ascending rod, the third ascending rod, the fourth ascending rod and the top of the column are respectively fixed with plastic parts, and the bottoms of the first ascending rod, the second ascending rod, the third ascending rod and the fourth ascending rod are respectively fixed with limiters, at least two limit strips are fixed outside the limiters, the four limiters have the same structure and their diameters decrease from top to bottom, and the plastic parts similarly decrease in diameter from top to bottom. The limiters are used to ensure that each ascending rod always maintains a linear motion when moving up and down, and will not tilt left and right to cause it to shake, and the space in the two limit strips is used to limit the steel cable to prevent it from falling off.

[0011] In some embodiments, the second ascending rod, the third ascending rod and the fourth ascending rod are respectively provided with wire openings for the steel cable to pass through, and an anti-slip bearing for limiting the steel cable is provided on one side of the built-in pulley block, and an iron sheet is fixed outside the anti-slip bearing. The iron sheet blocks the gap between the anti-slip bearing and each built-in pulley, thereby further preventing the steel cable from falling off.

[0012] In some embodiments, the elastic locking mechanism also includes a fixing plate fixed to the second ascending rod, the third ascending rod, the fourth ascending rod and one side of the column, one side of the fixing plate is provided with an elastic telescopic rod that slides with it and is fixed to the locking pin, one side of the fixing plate is fixed with a limiting rod connected to the elastic telescopic rod through a spring, and one side of the elastic telescopic rod is fixed with a keycap.

[0013] In some embodiments, limiting blocks are fixed on both sides of the elastic telescopic rod, and the limiting rod is provided with limiting openings that are matched with the shape and size of the limiting blocks.

[0014] In some embodiments, side support mechanisms are respectively provided on both sides of the third ascending rod, and the side support mechanisms include a support member fixed to the third ascending rod, a limit member is provided on the side of the support member away from the third ascending rod, a connecting pin is inserted into the support member and a first rotating pin is rotatably connected outside the connecting pin, gaskets that are gap-matched with the first rotating pin are respectively provided on both sides of the first rotating pin, and a first support rod and a second support rod that can be detached from each other are respectively provided at one end of the first rotating pin.

[0015] In some embodiments, a connector that fits the inner wall of the second support rod is fixed to the bottom of the first support rod, elastic pins are provided on both sides of the connector, and the second support rod is provided with a mounting hole that cooperates with the elastic pins.

[0016] In some embodiments, an embedded column is installed at the bottom of the second support rod, a second rotating pin is fixedly installed at the bottom of the embedded column, and a fixing foot is disposed on the outer sleeve of the second rotating pin.

[0017] In some embodiments, a plurality of leveling holes arranged equidistantly in the longitudinal direction are formed outside the third ascending rod and the fourth ascending rod, and the number of the leveling holes outside the fourth ascending rod is greater than the number of the leveling holes outside the third ascending rod.

[0018] The beneficial effects of this application are:

[0019] 1. The first lifting rod, the second lifting rod, the third lifting rod and the fourth lifting rod are controlled by a hand-cranked winch and a steel cable to be lifted and extended in sections, so that the spanning frame can be lifted to a suitable height in areas such as mountains where it is inconvenient to connect to the power supply, so that the cable or communication line spanning frame can be quickly built;

[0020] 2. Hide the steel cable inside the column, the first ascending rod, the second ascending rod, the third ascending rod and the fourth ascending rod to prevent safety accidents caused by the steel cable being easily conductive when exposed to the outside;

[0021] 3. The portable spanning frame is made of aluminum alloy and fiberglass as a whole. While ensuring sufficient supporting force, it is also very light, so it does not need to be carried by a vehicle, so it can be used in mountains, slopes, and low-lying areas.

[0022] 4. By correspondingly arranging the locking pin and the upper locking hole and the lower locking hole, the support or contraction state of the first ascending rod, the second ascending rod, the third ascending rod and the fourth ascending rod can be locked, which can greatly improve their stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the storage of the portable spanning rack of this application;

[0024] Figure 2 A schematic diagram of the unfolding process of the portable spanning frame of the present application;

[0025] Figure 3 This is a partial cross-sectional structural diagram of the column and four ascending rods of the portable spanning frame of the present application;

[0026] Figure 4 This is a schematic diagram of the structure of the steel cables of the portable spanning frame of this application running inside the column and four ascending rods;

[0027] Figure 5 This is a schematic diagram of the structure of the first built-in pulley, the second built-in pulley and the third built-in pulley of the portable crossing frame of the present application in the direction of the outer cable retraction;

[0028] Figure 6 This is a schematic diagram of the retraction direction of the outer steel cables of the fourth built-in pulley, the fifth built-in pulley and the sixth built-in pulley of the portable crossing frame of the present application;

[0029] Figure 7 For this application, the portable spanning frame Figure 1 A schematic diagram of the partially enlarged structure at center A;

[0030] Figure 8 For this application, the portable spanning frame Figure 1 A schematic diagram of the partially enlarged structure at B in the middle;

[0031] Fig. 9 For this application, the portable spanning frame Figure 3 The schematic diagram of the local enlarged structure at E in the middle;

[0032] Fig.10 This is a schematic diagram of the structure of the elastic locking mechanism outside the first ascending rod of the portable straddle rack of the present application;

[0033] Fig.11 Portable Crossing Frame for this Application Fig.10 The schematic diagram of the partial enlarged structure at F in the middle;

[0034] Fig.12 This is a schematic diagram of the distribution structure of the external leveling holes of the fourth ascending rod of the portable spanning frame of the present application;

[0035] Fig.13 This is a schematic diagram of the structure of the external leveling hole of the third ascending rod of the portable spanning frame of the present application;

[0036] Fig.14 For this application, the portable spanning frame Figure 2 A schematic diagram of the partially enlarged structure at C in the middle;

[0037] Fig.15 For this application, the portable spanning frame Figure 2 The schematic diagram of the local enlarged structure at D in the middle;

[0038] Fig.16 This is a schematic diagram of the exploded structure of the first support rod and the second support rod of the portable spanning frame of the present application;

[0039] Fig.17 This is a schematic diagram of the embedded columns and fixed feet structure of the portable spanning frame of this application.

[0040] In the figure: 1, column; 11, first ascending rod; 12, second ascending rod; 13, third ascending rod; 14, fourth ascending rod;

[0041] 2. Cable mechanism; 21. Hand-cranked winch; 22. Steel cable; 23. External pulley; 24. Internal pulley block; 241. First internal pulley; 242. Second internal pulley; 243. Third internal pulley; 244. Fourth internal pulley; 245. Fifth internal pulley; 246. Sixth internal pulley; 25. Stopper; 26. Wire port; 27. Anti-slip bearing; 28. Stopper strip; 29. ​​Iron sheet;

[0042] 3. Elastic locking mechanism; 31. Key cap; 32. Elastic telescopic rod; 321. Limit block; 33. Limit rod; 331. Limit opening; 34. Fixing plate; 35. Lock pin; 36. Upper locking hole; 37. Lower locking hole;

[0043] 4. Side support mechanism; 41. Support member; 42. Limiting member; 43. Connecting pin; 44. First rotating pin; 441. Gasket; 45. First support rod; 451. Connecting member; 452. Elastic pin; 46. Second support rod; 461. Mounting hole; 47. Embedded column; 471. Second rotating pin; 472. Fixed foot;

[0044] 5. Plastic parts; 6. Leveling holes. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] See also Figure 1 , Figure 2 and Figure 3 , this application provides a technical solution:

[0047] A portable crossing frame includes a column 1, which contains a fourth ascending rod 14, a third ascending rod 13, a second ascending rod 12 and a first ascending rod 11 from bottom to top. When in use, the first ascending rod 11, the second ascending rod 12, the third ascending rod 13 and the fourth ascending rod 14 in the two columns 1 need to be lifted to the highest height at the same time. The second ascending rod 12 and the first ascending rod 11 are glass fiber rods, which play an insulating role. The highest height of the crossing frame can be raised to 7.5 meters, and the cable or communication line can be crossed through the preset wire racking mechanism on the first ascending rod 11.

[0048] See also Figures 1 to 6 , Figure 8 and Fig. 9The column 1 is provided with a cable mechanism 2 for lifting the first lifting rod 11, the second lifting rod 12, the third lifting rod 13 and the fourth lifting rod 14. The cable mechanism 2 includes a hand-cranked winch 21 and an external pulley 23 fixed outside the column 1 and an internal pulley group 24. The internal pulley group 24 includes a first internal pulley 241 and a fourth internal pulley 244 respectively fixed at the upper and lower ends of the second lifting rod 12, a second internal pulley 242 and a fifth internal pulley 244 respectively fixed at the upper and lower ends of the third lifting rod 13. The hand-operated winch 21 is connected to the bottom of the first ascending rod 11, and a steel cable 22 is tied between the hand-operated winch 21 and the bottom of the first ascending rod 11. The steel cable 22 enters the column 1 through the external pulley 23 and is sequentially wound around the sixth built-in pulley 246, the third built-in pulley 243, the fifth built-in pulley 245, the second built-in pulley 242, the fourth built-in pulley 244 and the first built-in pulley 241, and then is tied to the first ascending rod 11. The bottom of the rod 11, the second ascending rod 12, the third ascending rod 13, the fourth ascending rod 14 and the top of the column 1 are respectively fixed with a plastic part 5, and the bottoms of the first ascending rod 11, the second ascending rod 12, the third ascending rod 13 and the fourth ascending rod 14 are respectively fixed with a limiter 25, and at least two limit strips 28 are fixed outside the limiter 25. The four limiters 25 have the same structure and their diameters decrease from top to bottom. Similarly, the diameter of the plastic part 5 decreases from top to bottom. The limiter 25 is used to ensure that each ascending rod always maintains when moving up and down It moves in a straight line without tilting left or right to cause it to shake, and the space in the two limit bars 28 is used to limit the steel cable 22 to prevent it from falling off. The second ascending rod 12, the third ascending rod 13 and the fourth ascending rod 14 are respectively provided with a line opening 26 for the steel cable 22 to pass through, and an anti-slip bearing 27 for limiting the steel cable 22 is provided on one side of the built-in pulley group 24, and an iron sheet 29 is fixed outside the anti-slip bearing 27. The iron sheet 29 blocks the gap between the anti-slip bearing 27 and each built-in pulley, further preventing the steel cable 22 from falling off.

[0049] See also Figure 1 , Fig.10 and Fig.11The column 1, the second ascending rod 12, the third ascending rod 13 and the fourth ascending rod 14 are all provided with an elastic locking mechanism 3 on one side. The elastic locking mechanism 3 includes a fixing plate 34 fixed to one side of the column 1, the second ascending rod 12, the third ascending rod 13 and the fourth ascending rod 14 respectively. A limit rod 33 is fixed to one side of the fixing plate 34. An elastic telescopic rod 32 connected to the limit rod 33 through a spring or a retaining ring is sleeved inside the limit rod 33. The elastic telescopic rod 32 is extended out of the fixing plate 34 and fixed to one side thereof. The locking pin 35 and the key cap 31 are fixed on the other side of the elastic telescopic rod 32, and the upper locking hole 36 and the lower locking hole 37 are respectively opened on the second ascending rod 12, the third ascending rod 13, the fourth ascending rod 14 and the column 1. The corresponding arrangement of the locking pin 35 and the upper locking hole 36 and the lower locking hole 37 can ensure that when the locking pin 35 is inserted into the upper locking hole 36, the cross frame will not extend at will when it is transported in the retracted state, and when the locking pin 35 is inserted into the lower locking hole 37, it can ensure that the cross frame will not extend at will when it is transported in the retracted state. The spanning frame will not fall down at will after being lifted. When it needs to be retracted, it only needs to pull out the locking pins 35 outside the column 1, the fourth ascending rod 14, the third ascending rod 13 and the second ascending rod 12 in sequence, so that it can be lowered by its own gravity to complete the storage. The limit blocks 321 are fixed on both sides of the elastic telescopic rod 32, and the limit rod 33 is provided with a limit opening 331 that is compatible with the shape and size of the limit block 321. When it is necessary to lift or put down, the key cap 31 is pulled outward and the elastic rod 33 is rotated to The elastic telescopic rod 32 makes the limit block 321 abut against the outside of the limit rod 33. When the first ascending rod 11, the second ascending rod 12, the third ascending rod 13 or the fourth ascending rod 14 is about to move to the limit distance, the elastic telescopic rod 32 is rotated again to make the limit block 321 snap into the limit opening 331 to ensure that the locking pin 35 enters the upper locking hole 36 or the lower locking hole 37 when the first ascending rod 11, the second ascending rod 12, the third ascending rod 13 or the fourth ascending rod 14 moves to the limit distance.

[0050] See also Figure 1 , Figure 2 , Figure 7 , Figures 14 to 17, side support mechanisms 4 are respectively provided on both sides of the third ascending rod 13, and the side support mechanisms 4 include a support member 41 fixed to the third ascending rod 13, a stopper 42 is provided on the side of the support member 41 away from the third ascending rod 13, a connecting pin 43 is inserted into the support member 41, and a first rotating pin 44 is rotatably connected to the outside of the connecting pin 43, and gaskets 441 are respectively provided on both sides of the first rotating pin 44 to match the clearance therewith, and a first supporting rod 45 and a second supporting rod 46 which can be detached from each other are respectively provided at one end of the first rotating pin 44, and a A connector 451 is fitted with the inner wall of the second support rod 46, and elastic pins 452 are respectively provided on both sides of the connector 451. The second support rod 46 is provided with a mounting hole 461 that cooperates with the elastic pin 452. An embedded column 47 is installed at the bottom of the second support rod 46, and a second rotating pin 471 is fixedly installed at the bottom of the embedded column 47. A fixed foot 472 is provided on the outer sleeve of the second rotating pin 471. Similarly, the above-mentioned side support structure can also be replaced by a soft cable tensioning structure, specifically, one end of the soft cable is tied to the outside of the limit member 42, and the other end is tied to the ground.

[0051] See also Figure 1 , Fig.12 and Fig.13 The third ascending rod 13 and the fourth ascending rod 14 are provided with a plurality of leveling holes 6 which are arranged equidistantly in the longitudinal direction. The number of the leveling holes 6 on the fourth ascending rod 14 is 30, and the number of the leveling holes 6 on the third ascending rod 13 is 5.

[0052] The working principle and use process of the present application are as follows: when lifting is required, the locking pin 35 is pulled outward and rotated so that the limit block 321 is stuck outside the limit rod 33, and the hand-cranked winch 21 is shaken to make the first ascending rod 11 rise upward first. When it is 5CM away from the limit height, the locking pin 35 is rotated to make the limit block 321 enter the limit opening 331. When the first ascending rod 11 reaches the limit distance, the locking pin 35 is aligned with the lower locking hole 37. Under the action of the spring, It enters the lower locking hole 37 to complete the lifting of the first lifting rod 11, and continuously shakes the hand-cranked winch 21, so that the second lifting rod 12, the third lifting rod 13, and the fourth lifting rod 14 repeat the above operations in sequence to achieve segmented lifting. The same applies when storage is needed. When storing, there is no need to shake the hand-cranked winch 21. The automatic falling storage process can be achieved only by the gravity of the first lifting rod 11, the second lifting rod 12, the third lifting rod 13, and the fourth lifting rod 14.

[0053] Finally, it should be noted that the above is only a preferred example of the present application and is not intended to limit the present application. Although the present application is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A portable straddling frame, comprising a column (1), wherein the column (1) is provided with a first ascending rod (11), a second ascending rod (12), a third ascending rod (13) and a fourth ascending rod (14) which are sequentially mounted from top to bottom, characterized in that: The invention also comprises a cable pulling mechanism (2), wherein the cable pulling mechanism (2) comprises a hand-cranked winch (21), an external pulley (23) and an internal pulley group (24), wherein the internal pulley group (24) comprises a first internal pulley (241) and a fourth internal pulley (244) respectively fixed to the upper and lower ends of the second ascending rod (12), a second internal pulley (242) and a fifth internal pulley (245) respectively fixed to the upper and lower ends of the third ascending rod (13), and a third internal pulley (243) and a sixth internal pulley (246) respectively fixed to the upper and lower ends of the fourth ascending rod (14 ...). The cable mechanism (2) also includes a steel cable (22) whose two ends are respectively tied to the hand-cranked winch (21) and the bottom of the first lifting rod (11); the second lifting rod (12), the third lifting rod (13), the fourth lifting rod (14) and the column (1) are all provided with an elastic locking mechanism (3); the elastic locking mechanism (3) includes an upper locking hole (36) and a lower locking hole (37) respectively opened on the second lifting rod (12), the third lifting rod (13), the fourth lifting rod (14) and the column (1); the upper locking hole (36) and the lower locking hole (37) are correspondingly provided with a locking pin (35) elastically matched therewith.

2. A portable spanning frame according to claim 1, characterized in that: The steel cable (22) enters the column (1) via the external pulley (23) and is sequentially wound around the sixth internal pulley (246), the third internal pulley (243), the fifth internal pulley (245), the second internal pulley (242), the fourth internal pulley (244) and the first internal pulley (241), and then is tied to the bottom end of the first lifting rod (11). The hand-cranked winch (21) drives the steel cable (22) to sequentially pull the first lifting rod (11), the second lifting rod (12), the third lifting rod (13) and the fourth lifting rod (14) to move upward along the inner wall of the column (1).

3. A portable spanning frame according to claim 2, characterized in that: The second ascending rod (12), the third ascending rod (13), the fourth ascending rod (14) and the top of the column (1) are respectively fixed with a plastic part (5); the first ascending rod (11), the second ascending rod (12), the third ascending rod (13) and the fourth ascending rod (14) are respectively fixed with a limiter (25) at the bottom; at least two limiter strips (28) are fixed outside the limiter (25); the four limiters (25) have the same structure and their diameters decrease from top to bottom; similarly, the diameter of the plastic part (5) decreases from top to bottom.

4. A portable spanning frame according to claim 3, characterized in that: The second ascending rod (12), the third ascending rod (13) and the fourth ascending rod (14) are respectively provided with a wire opening (26) for the steel cable (22) to pass through, and one side of the built-in pulley block (24) is provided with an anti-slip bearing (27) for limiting the steel cable (22), and an iron sheet (29) is fixed outside the anti-slip bearing (27).

5. The portable spanning frame according to claim 1, characterized in that: The elastic locking mechanism (3) also includes a fixing plate (34) fixed to the second ascending rod (12), the third ascending rod (13), the fourth ascending rod (14) and one side of the column (1); one side of the fixing plate (34) is provided with an elastic telescopic rod (32) that is slidably matched with the fixing plate (34) and fixed to a locking pin (35); one side of the fixing plate (34) is fixed with a limiting rod (33) that is connected to the elastic telescopic rod (32) via a spring; and one side of the elastic telescopic rod (32) is fixed with a key cap (31).

6. The portable spanning frame according to claim 5, characterized in that: Limit blocks (321) are fixed on both sides of the elastic telescopic rod (32), and the limit rod (33) is provided with a limit opening (331) that is matched in shape and size with the limit blocks (321).

7. The portable spanning frame according to claim 1, characterized in that: Side support mechanisms (4) are respectively provided on both sides of the third ascending rod (13), and the side support mechanisms (4) include a support member (41) fixed to the third ascending rod (13), and a limit member (42) is provided on the side of the support member (41) away from the third ascending rod (13), and a connecting pin (43) is inserted into the support member (41), and a first rotating pin (44) is rotatably connected to the outside of the connecting pin (43), and gaskets (441) that are clearance-matched with the first rotating pin (44) are respectively provided on both sides of the first rotating pin (44), and a first supporting rod (45) and a second supporting rod (46) that are detachable from each other are respectively provided at one end of the first rotating pin (44).

8. The portable spanning frame according to claim 7, characterized in that: A plug-in connector (451) is fixed at the bottom of the first support rod (45) and is in contact with the inner wall of the second support rod (46). Elastic pins (452) are respectively provided on both sides of the plug-in connector (451). The second support rod (46) is provided with a mounting hole (461) that is matingly matched with the elastic pin (452).

9. The portable spanning frame according to claim 7, characterized in that: An embedded column (47) is installed at the bottom of the second support rod (46), a second rotating pin (471) is fixedly installed at the bottom of the embedded column (47), and a fixed foot (472) is arranged on the outer shell of the second rotating pin (471).

10. The portable spanning frame according to claim 1, characterized in that: The third ascending rod (13) and the fourth ascending rod (14) are provided with a plurality of leveling holes (6) arranged at equal distances in the longitudinal direction, and the number of the leveling holes (6) on the fourth ascending rod (14) is greater than the number of the leveling holes (6) on the third ascending rod (13).

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