Movable crossing frame capable of automatically unfolding telescopic cloth net

Abstract

The invention discloses a mobile crossing frame capable of automatically unfolding a telescopic cloth net, and relates to the field of crossing frames for power line construction. A traditional electric power line crossing frame is usually built by adopting moso bamboos or steel pipes, and the building mode of the crossing frame is long in construction period and large in safety risk. The automatic net arranging device comprises a U-shaped frame body, a front automatic net arranging mechanism capable of automatically arranging a bearing net forwards, a rear automatic net arranging mechanism capable of automatically arranging the bearing net backwards, a telescopic stay cable and an adjustable connecting frame capable of adjusting a pitching angle and a horizontal rotation angle, wherein the extension length of the bearing net can be flexibly set according to field conditions; and a plurality of rolling shafts are arranged on a cross beam of the U-shaped frame body. The crane can be used as a mobile platform to carry out flexible mobile construction, the construction period is short, the telescopic stay cable can have pretightening force to synchronously extend with the front and rear automatic net arrangement mechanisms, the bearing capacity and flatness of the net blocking platform are enhanced, the adaptability and safety of large-span construction are improved, and the traction resistance of a wire can be reduced through the rolling shafts.

Description

Technical Field

[0001] The invention relates to the field of power line construction spanning frames, in particular to a mobile spanning frame capable of automatically unfolding a telescopic net. Background Art

[0002] During power transmission and transformation projects in power grid construction, high-voltage transmission lines often cross over critical infrastructure, such as roads, railways, and transmission lines. To prevent the guide ropes or transmission lines from accidentally falling during the stringing process and impacting the normal operation of the facilities below, various spanning structures are typically erected on both sides of the spanned infrastructure for support and protection. Traditional spanning structures, typically constructed from bamboo or steel pipes, have numerous drawbacks, including large space requirements, difficult coordination, long construction times, high costs, and significant safety risks.

[0003] To overcome the shortcomings of traditional spanning structures, patent number ZL201920105197.3 was developed. This device uses a truck-mounted crane boom to lift two U-shaped frames to a designated elevated location. These frames are then erected on either side of the structure being spanned to support the power lines above. Because this method lacks a protective net between the two steel U-shaped frames, if the spacing between the two frames is large, the power lines above could slip between them in the event of an accident, affecting the operation of the facilities below. Therefore, this method can only be used in construction scenarios where the spacing between the spanning frames is small.

[0004] CN 220306843U discloses a mobile umbrella-shaped spanning frame's opening mechanism. The spanning frame's opening mechanism is similar to an umbrella with its handle facing upwards, deploying a dynamic umbrella-shaped frame and forming a closed net structure using ropes. When the spanning frame is deployed, the spacing between its umbrella-shaped frames changes, and the closed net structure can only be supported by soft ropes. When the spanning frame is not deployed, the loose ropes are quite messy. Furthermore, the main load-bearing component of the spanning frame, the roller bar, is located in the middle of the handle, much higher than the surrounding umbrella-shaped frames and ropes. This results in a clear, high center and low perimeter structure. Consequently, the spanning frame also suffers from drawbacks such as messy ropes, insufficient load-bearing capacity, and an uneven support platform. This is particularly true during the demolition and construction of old transmission lines, where old conductors can rub and slide directly on the surrounding ropes of the closed net structure, causing significant damage to both the conductors and ropes and posing a safety risk. Summary of the Invention

[0005] The technical problem to be solved and the technical task to be proposed by the present invention are to improve and perfect the existing technical solutions and provide a mobile spanning frame that can automatically deploy a retractable net, so as to enhance the safety and construction convenience of the spanning frame. To this end, the present invention adopts the following technical solutions.

[0006] A mobile spanning frame capable of automatically deploying a telescopic net comprises a U-shaped frame, a front automatic net-laying mechanism capable of automatically extending forward to lay out a load-bearing net, a rear automatic net-laying mechanism capable of automatically extending backward to lay out a load-bearing net, and an adjustable connecting frame capable of adjusting the pitch angle and horizontal rotation angle. The U-shaped frame comprises a horizontal crossbeam at the bottom, a left column and a right column located on the left and right sides of the crossbeam, the crossbeam being connected and fixed to the adjustable connecting frame, and the adjustable connecting frame being connected and fixed to the front end of the crane boom. The front automatic net-laying mechanism and the rear automatic net-laying mechanism are both left-right symmetrical structures. The front automatic net-laying mechanism is connected to the front side of the crossbeam, and the extended end of the front automatic net-laying mechanism can extend forward to lay the net and retract to collect the net. The rear automatic net-laying mechanism is connected to the rear side of the crossbeam, and the extended end of the rear automatic net-laying mechanism can extend backward to lay the net and retract to collect the net. The left and right sides of the crossing frame are symmetrically provided with telescopic inclined cables. The telescopic inclined cables can be pre-tightened and extend or shortened in a forward and backward direction synchronously with the front automatic net-laying mechanism and the rear automatic net-laying mechanism. A plurality of rollers with axes in the left and right directions are provided on the front and rear sides of the crossbeam of the U-shaped frame. This device facilitates automated mesh deployment in both forward and backward directions. When not in use, the load-bearing net can be folded up and the U-shaped frame mounted on the front end of the crane boom via an adjustable connecting frame, enabling flexible mobile construction. The adjustable connecting frame adjusts the pitch angle and horizontal rotation angle of the spanning frame's mesh platform, adapting it to different construction scenarios and requirements, enhancing ease of use and flexibility. The symmetrically arranged telescopic cables on both sides can be preloaded and extended or shortened in sync with the front and rear automatic mesh deployment mechanisms, enhancing the platform's load-bearing capacity and improving the flatness of its supporting surface. This solves the problems of fixed dimensions and uneven mesh deployment associated with traditional spanning frames, significantly improving adaptability and safety in large-span construction. The provision of rollers reduces resistance to the conductors as they are pulled through. The rollers can be made of nylon.

[0007] As an optimal technical means: the front automatic net-laying mechanism includes two front electric reels, two front curved arms and a front tensioning steel pipe, the front electric reel and the front curved arm are connected to the front side of the crossbeam, and the front electric reel is located above the front curved arm, the front electric reel is provided with a front load-bearing net that can be horizontally expanded and retracted, the front end of the front load-bearing net is connected and fixed to the front tensioning steel pipe, the front end of the front curved arm is rotatably connected to the front tensioning steel pipe, and the axial direction of the front tensioning steel pipe is left and right; the rear automatic net-laying mechanism includes two rear electric reels, two rear curved arms and a rear tensioning steel pipe, the rear electric reel and the rear curved arm are connected to the rear side of the crossbeam, and the rear electric reel is located above the rear curved arm, the rear electric reel is provided with a rear load-bearing net that can be horizontally expanded and retracted, the rear end of the rear load-bearing net is connected and fixed to the rear tensioning steel pipe, the rear end of the rear curved arm is rotatably connected to the rear tensioning steel pipe, and the axial direction of the rear tensioning steel pipe is left and right. This structure effectively realizes the function of automatic net laying and realizes automatic net laying control of the load-bearing net. The left-right symmetrical structure also makes the overall force of the crossing frame more uniform, thereby improving the stability and safety of the crossing frame.

[0008] As a preferred technical measure, the left and right ends of the rear-tensioning steel pipe are each connected to a rear anchoring cable, the lower end of which is connected to the rear end of the crane turntable. This design further improves the load-bearing capacity of the net-sealing platform, particularly the front platform, allowing the span to better withstand the pressure of overhead power lines and other loads during use, thereby enhancing the span's safety and reliability. Furthermore, the rear anchoring cable mechanism can rotate with the platform without affecting the span's overall operation and flexibility.

[0009] As a preferred technical measure, the left column is tilted upward and to the left outside, while the right column is tilted upward and to the right outside. The structure in which the side columns are tilted upward and outward allows the wires above to slide to the middle of the beam if they accidentally fall, thus better bearing the load and making the overall structure of the span more stable, enhancing the span's wind resistance and overall stability.

[0010] As a preferred technical approach, the U-shaped frame is constructed using section steel, with a rectangular cross-section. This rectangular steel frame offers high strength and stability, and its hollow interior facilitates the installation of various components, making the span more structured and improving the span's overall load-bearing capacity.

[0011] As a preferred technical approach, a crank arm drive mechanism is installed on each left and right side of the crossbeam. The drive shaft of each crank arm drive mechanism is connected to the front and rear crank arms on the same side via two connecting rods. This allows for more synchronized and coordinated extension and retraction of the crank arms, ensuring consistency on both sides of the load-bearing net during deployment and retraction, improving the effectiveness of netting deployment and retraction, and enhancing the overall stability and reliability of the spanning frame.

[0012] As a preferred technical measure, the extension length of the front curved arm is 1.5-2.2 times that of the rear curved arm. The coverage of the front and rear load-bearing nets can be rationally allocated according to actual construction requirements, allowing the spanning frame to better protect overhead power lines and other equipment when crossing over different facilities. This improves the spanning frame's applicability and flexibility, while also facilitating optimization of its overall structure and force distribution.

[0013] As a preferred technical approach, the adjacent ends of the two front electric reels are connected to the same coaxial front chain gear, which is then chain-connected to the front drive motor inside the crossbeam; the adjacent ends of the two rear electric reels are connected to the same coaxial rear chain gear, which is then chain-connected to the rear drive motor inside the crossbeam. This ensures consistent tension on both sides of the load-bearing net during deployment and retraction, improving the quality of netting and retraction. It also facilitates control and maintenance of the electric reels, increasing the automation and efficiency of the spanning frame. Alternatively, the drive motor may be a hydraulic motor, for example.

[0014] As a preferred technical means: the adjustable connecting frame includes a bottom base frame, a middle support frame, and a top hydraulic slewing support. The bottom of the base frame is provided with a pin connection mechanism with adjustable length and width spacing for connecting to different crane booms. The hydraulic slewing support is fixedly connected to the upper crossbeam. The lower end of the support frame is integrally connected to the base frame. The rear side of the bottom of the hydraulic slewing support is rotatably connected to the upper end of the support frame. The front side of the bottom of the hydraulic slewing support and the front side of the upper end of the base frame are connected to a pitch adjustment hydraulic cylinder. The pin connection mechanism at the bottom of the base frame is adjustable in length and width spacing, allowing connection to different crane booms, thereby improving the versatility of the spanning frame. The horizontal rotation angle of the spanning frame is adjusted by the hydraulic slewing support, and the pitch angle of the spanning frame is adjusted by the pitch adjustment hydraulic cylinder. The pin connection mechanism is adjustable in length and width spacing, allowing connection to different crane booms, thereby improving the versatility of the spanning frame, facilitating use in different construction scenarios, and enhancing the adaptability and ease of operation of the spanning frame.

[0015] As a preferred technical measure, the automatic extension and retraction mechanism of the telescopic stay cables is installed in the left and right columns. The retractable ends of the telescopic stay cables are connected to the ends of the corresponding tensioning steel pipes. This allows the telescopic stay cables to better cooperate with the front and rear automatic net-laying mechanisms. The synchronous belt preload is extended or shortened when the boom is extended or retracted, effectively enhancing the boom's load-bearing capacity and further improving the load-bearing capacity and stability of the net-sealing platform. Simultaneously, the extension control mechanism is located in the column, making the spanning frame more compact and easier to install and maintain.

[0016] Beneficial effects: This device can conveniently realize automatic net laying operations in the front and rear directions, and flexibly set the extension length of the front and rear load-bearing nets according to site conditions. When not in use, the load-bearing nets can be folded up, and the U-shaped frame can be installed on the front end of different crane booms through the adjustable connecting frame, which can be used for flexible mobile construction, thereby improving the versatility of the crossing frame, facilitating use in different construction scenarios, and enhancing the adaptability and ease of operation of the crossing frame; the adjustable connecting frame can adjust the pitch angle and horizontal rotation angle of the crossing frame net platform, so that the crossing frame can adapt to different construction scenarios and needs, and improve the convenience and flexibility of use; the telescopic inclined cables symmetrically arranged on the left and right sides can be pre-tightened and extended or shortened in the front and rear directions synchronously with the front and rear automatic net laying mechanisms, thereby enhancing the carrying capacity of the net sealing platform and improving the flatness of the supporting surface of the net sealing platform, solving the problems of fixed size and uneven net laying of traditional crossing frames, and significantly improving the adaptability and safety of large-span construction; the setting of the roller can reduce the resistance of the wire when it is pulled through. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the folded state of the spanning frame of the present invention.

[0018] Figure 2 It is a schematic diagram of the spanning frame of the present invention in the open state.

[0019] Figure 3 This invention Figure 2 Enlarged schematic diagram of part A in the middle.

[0020] Figure 4 It is a schematic diagram of the driving connection between the crank arm and the electric reel in the present invention.

[0021] Figure 5 It is a structural schematic diagram of the adjustable connecting frame in the present invention.

[0022] Figure: 1. U-shaped frame; 2. Front automatic net-laying mechanism; 3. Rear automatic net-laying mechanism; 4. Adjustable connecting frame; 5. Crane boom; 6. Telescopic stay cable; 7. Roller; 8. Rear anchoring guy rope; 9. Crane turntable; 10. Boom drive hydraulic cylinder; 11. Connecting rod; 12. Front chain gear; 13. Front drive motor; 14. Rear chain gear; 15. Rear drive motor; 16. Chain; 17. Fixed pulley; 18. Automatic take-up drum; 101. Crossbeam; 102. Left column ;103, right side column;201, front electric reel;202, front curved arm;203, front tensioning steel pipe;204, front load-bearing net;301, rear electric reel;302, rear curved arm;303, rear tensioning steel pipe;304, rear load-bearing net;401, base frame;402, support frame;403, hydraulic slewing support;404, pin connection mechanism;405, pitch adjustment hydraulic cylinder;601, left front oblique cable;602, left rear oblique cable;603, right front oblique cable;604, right rear oblique cable. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings.

[0024] In the description of the present invention, it should be understood that terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Since the embodiments disclosed in the present invention can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. For example, "up" and "down" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0025] Example 1 like Figure 1-3As shown, a mobile spanning frame capable of automatically deploying a telescopic net comprises a U-shaped frame 1, a front automatic net-laying mechanism 2 capable of automatically arranging a load-bearing net forward, a rear automatic net-laying mechanism 3 capable of automatically arranging a load-bearing net backward, and an adjustable connecting frame 4 capable of adjusting the pitch angle and horizontal rotation angle. The U-shaped frame 1 comprises a horizontal crossbeam 101 at the bottom, a left column 102 and a right column 103 located on the left and right sides of the crossbeam 101, the crossbeam 101 is connected and fixed to the adjustable connecting frame 4, and the adjustable connecting frame 4 is connected and fixed to the front end of the crane boom 5. The front automatic net-laying mechanism 2 and the rear automatic net-laying mechanism 3 are both symmetrical structures. The front automatic net-laying mechanism 2 is connected to the front side of the crossbeam 101. The extended end of the front automatic net-laying mechanism 2 can extend forward to lay the net and retract to collect the net. The rear automatic net-laying mechanism 3 is connected to the rear side of the crossbeam 101. The extended end of the rear automatic net-laying mechanism 3 can extend backward to lay the net and retract to collect the net. Telescopic inclined cables 6 are symmetrically provided on the left and right sides of the spanning frame. The telescopic inclined cables 6 can be extended or shortened in a forward and backward direction synchronously with the front automatic net-laying mechanism 2 and the rear automatic net-laying mechanism 3 with pre-tightening force. Rollers 7 with lateral axes are installed on the front and rear sides of the crossbeam 101 of the frame 1. Rollers 7 include long rollers and short rollers. Two groups of four long rollers are arranged in a left-right direction on the front and rear sides of the crossbeam 101. Two groups of three short rollers are arranged in series between the two groups of long rollers. Each short roller is located at the adjacent end area of ​​two adjacent long rollers in the same group. The axial length of the short roller is greater than the adjacent end spacing of the two adjacent long rollers in the same group. This prevents the wire being pulled through from falling into the end gaps between adjacent long rollers. In this embodiment, the rollers are nylon rollers.

[0026] In order to realize the connection structure of the automatic net-laying mechanism, the front automatic net-laying mechanism 2 includes two front electric drums 201, two front curved arms 202 and a front tensioning steel pipe 203. The front electric drums 201 and the front curved arms 202 are connected to the front side of the crossbeam 101, and the front electric drums 201 are located above the front curved arms 202. Each front electric drum 201 is provided with a front load-bearing net 204 that can be horizontally expanded and retracted. The front end of the front load-bearing net 204 is fixedly connected to the front tensioning steel pipe 203. The front ends of the two front curved arms 202 are rotatably connected to the front tensioning steel pipe 203 in a hinged manner. The front tensioning steel pipe 203 is connected to the front tensioning steel pipe 203 in a hinged manner. The rear automatic net-laying mechanism 3 includes two rear motorized reels 301, two rear curved arms 302, and a rear tensioning steel pipe 303. The rear motorized reels 301 and the rear curved arms 302 are connected to the rear side of the crossbeam 101, with the rear motorized reels 301 located above the rear curved arms 302. Each rear motorized reel 301 is provided with a rear load-bearing net 304 that can be horizontally expanded and retracted. The rear end of the rear load-bearing net 304 is fixedly connected to the rear tensioning steel pipe 303. The rear ends of the two rear curved arms 302 are rotatably connected to the rear tensioning steel pipe 303 using a hinged connection. The axial direction of the rear tensioning steel pipe 303 is horizontal. The front curved arms 202 and the rear curved arms 302 are connected to the side of the crossbeam 101 at the same height. The front motorized reels 201 and the rear motorized reels 301 are connected to the crossbeam 101 at the same height. The connection structure of the automatic net-laying mechanism is effectively realized, and the automatic net-laying control of the load-bearing net is realized. The bilaterally symmetrical structure also makes the overall force of the span frame more uniform, thereby improving the stability and safety of the span frame. In this embodiment, the load-bearing net is a nylon load-bearing net.

[0027] For ease of manufacturing, the U-shaped frame 1 is a steel structure constructed from angle steel. The crossbeam 101 of the U-shaped frame 1 has a square cross-section, while the side columns have a rectangular cross-section. This steel structure, constructed from angle steel, is easy to manufacture, lightweight, and cost-effective, offering high strength and stability. Its hollow interior facilitates the installation of various components, making the spanning frame more compact and regular. This improves the spanning frame's overall load-bearing capacity and reduces space usage when collapsed, making it easier to move and store.

[0028] In order to make the extension and retraction of the crank arm more synchronized and coordinated, Figure 4As shown, a crank arm driving mechanism is provided on the left and right sides of the interior of the crossbeam 101, and the front crank arm 202 and the rear crank arm 302 are both two-section horizontally foldable and extendable structures, wherein the first section is rotatably connected to the crossbeam 101 through a pin, and the second section is hinged to the tensioning steel pipe. A rotatable connection structure connected by a pin is adopted between the first section and the second section. In this embodiment, the crank arm driving mechanism adopts a crank arm driving hydraulic cylinder 10, and the end of the driving shaft of the crank arm driving hydraulic cylinder 10 is rotatably connected to two connecting rods 11 of the same shape and size. The two connecting rods 11 are rotatably connected to the first sections of the front crank arm 202 and the rear crank arm 302 on the same side respectively. The connection structure is a structure symmetrical front and back according to the crossbeam 101. The front crank arm 202 and the rear crank arm 302 are rotatably connected to the crossbeam 101, and each tensioning steel pipe is hinged to the second section of the two front crank arms 202 or the rear crank arm 302. Driven by the crank arm driving hydraulic cylinder 10, the horizontal telescopic, folding or extending movements of the front crank arm 202 and the rear crank arm 302 are more synchronized and coordinated, which can ensure the consistency of the movements of the front and rear sides of the load-bearing net during the unfolding and folding process, improve the effect of laying and folding the net, and also enhance the overall stability and reliability of the cross-frame.

[0029] In order to improve the applicability and flexibility of the spanning frame, the extended length of the front curved arm 202 is twice the extended length of the rear curved arm 302. The front curved arm 202 and the rear curved arm 302 are made of high-strength aviation aluminum alloy, and the cross-sectional shape of the front curved arm 202 and the rear curved arm 302 is rectangular. The coverage of the front and rear load-bearing nets can be reasonably allocated according to actual construction needs, so that the spanning frame can better protect the power transmission lines above when crossing different facilities, thereby improving the applicability and flexibility of the spanning frame. It is also conducive to optimizing the overall structure and force distribution of the spanning frame. The use of high-strength aviation aluminum alloy material has high strength and light weight, which can reduce the weight of the spanning frame itself. The rectangular shape facilitates the coplanarity of the first and second sections after connection during processing, and facilitates the connection structure through multiple connection ears at the rotatable connection part, making the connection more stable and reliable.

[0030] In order to improve the quality of the network, Figure 4As shown, the adjacent ends of the two front electric reels 201 are connected to the same front chain gear 12 that is coaxial with the two front electric reels 201, and are connected to the front drive motor 13 inside the crossbeam 101 through a chain 16; the adjacent ends of the two rear electric reels 301 are connected to the same rear chain gear 14 that is coaxial with the two rear electric reels 301, and are connected to the rear drive motor 15 inside the crossbeam 101 through a chain 16. The front drive motor 13 and the rear drive motor 15 are both servo motors. This can ensure that the tension on the left and right sides of the load-bearing net is consistent during the unfolding and folding process, improving the quality of net laying and folding. It also facilitates the control and maintenance of the electric reels, improving the automation level and efficiency of the spanning frame. By using two relatively short front electric reels 201, each connected to a smaller width load-bearing net for combined net laying, the uneven net laying caused by rotation deviation caused by using a long electric reel can be avoided, thereby improving reliability.

[0031] In order to achieve angle adjustment and connection with different crane booms 5, such as Figure 5 As shown, the adjustable connecting frame 4 includes a bottom frame 401, a support frame 402 in the middle and a hydraulic rotary support 403 at the top. The bottom of the bottom frame 401 is provided with a pin connection mechanism 404 with adjustable length and width spacing for connecting with different crane booms 5. The hydraulic rotary support 403 is connected and fixed to the bottom of the upper crossbeam 101. The support frame 402 is a herringbone structure when viewed from the left and right directions. The four support points at the lower end of the support frame 402 are integrally connected to the bottom frame 401. The rear side of the bottom of the hydraulic rotary support 403 is connected to the support frame 40 2, the left and right support points at the upper end are rotatably connected, the front side of the bottom of the hydraulic slewing support 403 and the front side of the upper end of the base frame 401 are connected with two pitch adjustment hydraulic cylinders 405, and a lithium-ion hydraulic power unit is provided inside the crossbeam 101. The hydraulic power unit is connected to the pitch adjustment hydraulic cylinder 405, the electric reel, the crank arm drive hydraulic cylinder 10 and the hydraulic slewing support 403 to provide power. In this embodiment, the base frame 401 and the support frame 402 are both welded with rectangular steel pipes, and the base frame 401 and the support frame 402 are also welded. The hydraulic power unit provides power for the horizontal rotation, pitch angle adjustment, boom extension and extension of the load-bearing net of the spanning frame. The pin connection mechanism 404 at the bottom of the base frame 401 can adjust the length and width spacing, and can be connected to different crane booms 5, thereby improving the versatility of the spanning frame; the rotation angle of the spanning frame is adjusted by the hydraulic slewing support 403, and the pitch angle adjustment of the spanning frame is achieved by the pitch adjustment hydraulic cylinder 405. The pin connection mechanism 404 can adjust the length and width spacing, and can be connected to different crane booms 5, thereby improving the versatility of the spanning frame, facilitating use in different construction scenarios, and enhancing the adaptability and ease of operation of the spanning frame.

[0032] In order to realize the telescopic structure of the inclined cable, such as Figure 3 As shown, the automatic telescopic mechanism of the telescopic inclined cable 6 adopts an automatic winding drum 18 driven by a winding drum spring. There are four automatic winding drums 18, two of which are arranged in the left column 102 and two in the right column 103. The telescopic inclined cable 6 includes a left front inclined cable 601, a left rear inclined cable 602, a right front inclined cable 603 and a right rear inclined cable 604. One end of the left front inclined cable 601 is connected to the automatic winding drum 18 on the front side of the left column 102 after being turned through the fixed pulley 17 on the front side of the upper end of the left column 102, and the other end of the left front inclined cable 601 is connected and fixed to the left end of the front tensioning steel pipe 203; one end of the right front inclined cable 603 is connected and fixed through the fixed pulley 17 on the front side of the upper end of the right column 103 After the pulley 17 is turned, it is connected to the automatic winding drum 18 on the inner front side of the right column 103, and the other end of the right front inclined cable 603 is connected and fixed to the right end of the front tensioning steel pipe 203; one end of the left rear inclined cable 602 is connected to the automatic winding drum 18 on the inner rear side of the left column 102 through the fixed pulley 17 on the inner upper end rear side of the left column 102, and the other end of the left rear inclined cable 602 is connected and fixed to the left end of the rear tensioning steel pipe 303; one end of the right rear inclined cable 604 is connected to the automatic winding drum 18 on the inner rear side of the right column 103 through the fixed pulley 17 on the inner upper end rear side of the right column 103, and the other end of the right rear inclined cable 604 is connected and fixed to the right end of the rear tensioning steel pipe 303. The telescopic connection structure of the telescopic inclined cable 6 is realized, so that the telescopic inclined cable 6 can better cooperate with the front and rear automatic net-laying mechanisms 3. The pre-tightening force of the synchronous belt is extended or shortened when the crank arm is extended and retracted, which effectively enhances the bearing capacity of the crank arm and further improves the bearing capacity and stability of the net-sealing platform. At the same time, the extension control mechanism is arranged in the column, making the structure of the crossing frame more compact and convenient for installation and maintenance.

[0033] During construction, first, according to the needs of the actual operation spanning scene, the corresponding crane is selected, and the length and width spacing of the pin seat of the pin connection mechanism 404 at the bottom of the adjustable connecting frame 4 are adjusted to make it consistent with the connection interface at the front end of the crane boom 5. Then, the spanning frame is connected and fixed to the front end of the crane boom 5 through the pin connection mechanism 404, and the crane boom 5 is supported according to the height and position of the sealing net, so that the height position and angle of the crane boom 5 are consistent with the sealing operation. The operator remotely deploys the front automatic net laying mechanism 2 and the rear automatic net laying mechanism 3. When laying the net, the telescopic inclined cable 6 with pre-tightening force is synchronously extended forward and backward with the front automatic net laying mechanism 2 and the rear automatic net laying mechanism 3. If the horizontal angle and pitch angle of the sealing net need to be adjusted, the adjustable connecting frame 4 is remotely controlled to make corresponding angle adjustments. When a relatively wide net laying area is required, two spanning frames are carried by two cranes and located on both sides of the spanning area, and the front ends of the spanning frames are arranged facing each other to form a longer spanning load-bearing net combination. When the crossing wire is pulled over the load-bearing net of the crossing frame, the wire rolls in contact with the roller 7, which can reduce the pulling resistance and improve the pulling effect.

[0034] This device can facilitate the automatic net laying operation in the front and rear directions. When not in use, the load-bearing net can be horizontally folded toward the crossbeam 101. After the crane boom 5 is retracted, the construction site can be moved. Flexible mobile construction can be carried out, so that the crossing frame can adapt to different construction scenes and needs, which improves the convenience and flexibility of use. The telescopic inclined cable 6 can be pre-tightened and extend or shortened in the front and rear directions synchronously with the front and rear automatic net laying mechanisms 3, thereby enhancing the carrying capacity of the net sealing platform and improving the flatness of the supporting surface of the net sealing platform. It solves the problems of fixed size and uneven net laying of traditional crossing frames, and significantly improves the adaptability and safety of large-span construction.

[0035] Example 2 Unlike the first embodiment above, the left and right ends of the rear tensioning steel pipe 303 are each connected to a rear anchoring cable 8, the lower ends of which are connected to the crane turntable 9. After the net laying operation is completed, the two rear anchoring cables 8 are tightened, and the lower ends of the rear anchoring cables 8 are tightened and fixed to the rear of the crane turntable 9. This further improves the bearing capacity of the net sealing platform, especially the load-bearing capacity of the front platform, so that the spanning frame can better withstand the pressure of the overhead power lines during use, thereby improving the safety and reliability of the spanning frame. At the same time, the rear cable mechanism can rotate together with the platform without affecting the overall operation and flexibility of the spanning frame.

[0036] Example 3 Unlike the first or second embodiment above, the left column 102 is tilted upward and to the left, while the right column 103 is tilted upward and to the right. The tilted outward and upward structure of the side columns allows the load to slide to the middle of the beam if the upper conductor accidentally falls, making the overall structure of the span more stable and enhancing the span's wind resistance and overall stability.

[0037] The mobile crossing frame that can automatically unfold the telescopic cloth net shown above is a specific embodiment of the present invention, which has reflected the outstanding substantial features and significant progress of the present invention. According to actual use needs and under the guidance of the present invention, equivalent modifications can be made to its shape, structure, etc., which are all within the scope of protection of this scheme.

Claims

1. A mobile spanning frame capable of automatically unfolding a telescopic net, characterized by: The U-shaped frame includes a front automatic net-laying mechanism that can automatically extend forward to lay out the load-bearing net, a rear automatic net-laying mechanism that can automatically extend backward to lay out the load-bearing net, and an adjustable connecting frame that can adjust the pitch angle and horizontal rotation angle. The U-shaped frame includes a horizontal beam at the bottom, a left column and a right column on the left and right sides of the beam, the beam is connected and fixed on the adjustable connecting frame, the adjustable connecting frame is connected and fixed to the front end of the crane boom, the front automatic net-laying mechanism and the rear automatic net-laying mechanism are both left-right symmetrical structures, the front automatic net-laying mechanism The net mechanism is connected to the front side of the beam, and the extended end of the front automatic net-laying mechanism can extend forward to lay the net and retract to collect the net. The rear automatic net-laying mechanism is connected to the rear side of the beam, and the extended end of the rear automatic net-laying mechanism can extend backward to lay the net and retract to collect the net. Telescopic inclined cables are symmetrically provided on the left and right sides of the crossing frame. The telescopic inclined cables can be pre-tightened and extend or shortened synchronously with the front automatic net-laying mechanism and the rear automatic net-laying mechanism in the forward and backward directions. A plurality of rollers with left and right axes are provided on the front and rear sides of the beam of the U-shaped frame.

2. The mobile spanning frame capable of automatically unfolding a telescopic net according to claim 1, characterized in that: The front automatic net-laying mechanism includes two front electric reels, two front curved arms and a front tensioning steel pipe, the front electric reel and the front curved arm are connected to the front side of the crossbeam, and the front electric reel is located above the front curved arm, the front electric reel is provided with a front load-bearing net that can be horizontally expanded and retracted, the front end of the front load-bearing net is connected and fixed to the front tensioning steel pipe, the front end of the front curved arm is rotatably connected to the front tensioning steel pipe, and the axial direction of the front tensioning steel pipe is left and right; the rear automatic net-laying mechanism includes two rear electric reels, two rear curved arms and a rear tensioning steel pipe, the rear electric reel and the rear curved arm are connected to the rear side of the crossbeam, and the rear electric reel is located above the rear curved arm, the rear electric reel is provided with a rear load-bearing net that can be horizontally expanded and retracted, the rear end of the rear load-bearing net is connected and fixed to the rear tensioning steel pipe, the rear end of the rear curved arm is rotatably connected to the rear tensioning steel pipe, and the axial direction of the rear tensioning steel pipe is left and right.

3. The mobile spanning frame capable of automatically unfolding a telescopic net according to claim 2, characterized in that: The left and right ends of the rear tensioning steel pipe are respectively connected to a rear anchoring cable wind rope, and the lower end of the rear anchoring cable wind rope is connected to the tail of the crane turntable.

4. The mobile spanning frame capable of automatically unfolding a telescopic net according to claim 2, characterized in that: The left column is inclined from bottom to top and toward the left outer side, and the right column is inclined from bottom to top and toward the right outer side.

5. The mobile spanning frame capable of automatically unfolding a telescopic net according to claim 2, characterized in that: The U-shaped frame is a steel structure frame constructed using section steel, and the cross-section of the U-shaped frame is rectangular.

6. The mobile spanning frame capable of automatically unfolding a telescopic net according to claim 5, characterized in that: A crank arm driving mechanism is respectively provided on the left and right sides of the interior of the crossbeam, and the driving shaft of each crank arm driving mechanism is respectively connected to the front crank arm and the rear crank arm on the same side through two connecting rods.

7. The mobile spanning frame capable of automatically unfolding a telescopic net according to claim 6, characterized in that: The extended length of the front curved arm is 1.5-2.2 times that of the rear curved arm, and the positions of the two front curved arms are staggered up and down.

8. The mobile spanning frame capable of automatically unfolding a telescopic net according to claim 7, characterized in that: The adjacent ends of the two front electric reels are connected to the same coaxial front chain gear, and are connected to the front drive motor inside the beam through a chain; the adjacent ends of the two rear electric reels are connected to the same coaxial rear chain gear, and are connected to the rear drive motor inside the beam through a chain.

9. The mobile spanning frame capable of automatically unfolding a telescopic net according to claim 8, characterized in that: The adjustable connecting frame includes a base frame at the bottom, a support frame in the middle and a hydraulic slewing support at the top. The bottom of the base frame is provided with a pin connection mechanism with adjustable length and width spacing for connecting to different crane arms. The hydraulic slewing support is fixedly connected to the upper crossbeam. The lower end of the support frame is integrally connected to the base frame. The rear side of the bottom of the hydraulic slewing support is rotatably connected to the upper end of the support frame. The front side of the bottom of the hydraulic slewing support and the front side of the upper end of the base frame are connected with a pitch adjustment hydraulic cylinder.

10. The mobile spanning frame capable of automatically unfolding a telescopic net according to claim 9, characterized in that: The automatic telescopic mechanism of the telescopic cable is arranged in the left column and the right column. The telescopic ends of the telescopic cable are connected to the ends of the corresponding tensioning steel pipes, and the rear end of the telescopic cable is wound in the elastic retraction reel.

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