A mobile spanning frame capable of automatically deploying a telescopic cloth net

Abstract

The application discloses a mobile spanning frame capable of automatically unfolding and stretching cloth net, and relates to the field of power line construction spanning frame. The traditional power line spanning frame is usually built by using bamboo or steel pipe, and the construction period of the spanning frame is long, and the safety risk is big. The spanning frame comprises a U-shaped frame body, a front automatic net arranging mechanism capable of automatically arranging a bearing net forward, a rear automatic net arranging mechanism capable of automatically arranging the bearing net backward, the stretching length of the bearing net can be flexibly set according to the site condition, a telescopic cable-stayed cable and an adjustable connecting frame capable of adjusting the pitch angle and the horizontal rotation angle, and a plurality of rolling shafts are arranged on the upper surface of the crossbeam of the U-shaped frame body. The crane is used as a mobile platform and can be flexibly moved for construction, the construction period is short, the telescopic cable-stayed cable can be synchronously stretched with the front and rear automatic net arranging mechanisms with pre-tightening force, the bearing capacity and the flatness of the net sealing platform are enhanced, the adaptability and the safety of large-span construction are improved, and the rolling shafts can reduce the wire traction resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power line construction crossing frame, in particular to a mobile crossing frame capable of automatically unfolding and stretching the net. BACKGROUND

[0002] In the construction of power grid construction, high-voltage transmission lines often need to cross important facilities such as roads, railways and transmission lines. In order to prevent the guide rope or transmission line from falling accidentally during the stringing process and affecting the normal operation of the facilities below, various crossing frames are usually erected on both sides of the crossed facilities for support and protection. The traditional crossing frame is usually built with bamboo or steel pipe. This crossing frame building method has many shortcomings such as large land occupation, difficult coordination, long construction period, high cost, and high safety risk.

[0003] In order to overcome the shortcomings of the traditional crossing frame, patent No. ZL201920105197.3 uses a car type crane boom to send two U-shaped frames to a designated position high above, and erects them on both sides of the crossed facilities to support the overhead transmission line. Because this method does not set up a protective net between the two steel structure U-shaped frames, if the distance between the two frames is large, the overhead transmission line may slide between the two frames in case of accident, affecting the operation of the facilities below, so this method can only be used for construction in the scene with small distance between the crossing frames.

[0004] CN 220306843U discloses a mobile umbrella-shaped crossing frame opening mechanism. The umbrella-shaped crossing frame opening mechanism is like an umbrella with the handle facing up. The umbrella-shaped frame is unfolded by power, and the net structure is formed by ropes. The distance between the umbrella-shaped frames is variable when the umbrella-shaped crossing frame is unfolded, and the net structure can only bear force with soft ropes. When the umbrella frame is not unfolded, the loose ropes are relatively messy. In addition, the main load-bearing component of the umbrella-shaped crossing frame, the roll lever, is located at the umbrella handle in the middle, which is much higher than the umbrella-shaped frame and the ropes around it. The net structure has the obvious feature of being higher in the middle and lower around. Therefore, the umbrella-shaped crossing frame also has defects such as messy ropes, insufficient carrying capacity, and uneven support platform. Especially in the old transmission line construction, the old guide wire directly rubs and slides on the peripheral ropes of the net structure, which causes great damage to the guide wire and the ropes, and poses a certain safety risk. SUMMARY

[0005] The technical problem to be solved by the present application and the technical task proposed are to perfect and improve the existing technical solutions, and to provide a mobile crossing frame capable of automatically unfolding and stretching the net, in order to improve the safety and convenience of the crossing frame. To this end, the present application adopts the following technical solutions.

[0006] The utility model provides a kind of mobile spanning frame capable of automatically deploying telescopic cloth net, including U-shaped frame body, the front automatic cloth net mechanism of being arranged to automatically stretch forward load-bearing net, the rear automatic cloth net mechanism of being arranged to automatically stretch backward load-bearing net and the adjustable connecting frame of being able to carry out pitch angle and horizontal rotation angle adjustment, the U-shaped frame body includes horizontal crossbeam at bottom, left side column and right side column on the upper surface of left and right sides, the crossbeam is connected and fixed on the upper surface of adjustable connecting frame, the adjustable connecting frame is connected and fixed on the front end of crane boom, the front automatic cloth net mechanism and the rear automatic cloth net mechanism are both left-right symmetrical structure, the front automatic cloth net mechanism is connected on the front side of the crossbeam, and the stretchable end of front automatic cloth net mechanism can stretch forward cloth net and retract net, the rear automatic cloth net mechanism is connected on the rear side of the crossbeam, and the stretchable end of rear automatic cloth net mechanism can stretch backward cloth net and retract net, the spanning frame is provided with telescopic cable-stayed cable left-right symmetrically on left and right sides, the telescopic cable-stayed cable can be pre-tightening force and front automatic cloth net mechanism and rear automatic cloth net mechanism are synchronously lengthened or shortened in front and back, the crossbeam of the U-shaped frame body is provided with multiple rollers on the upper surface of front and back, the device can conveniently realize the automatic cloth net operation in front and back direction, when not using, load-bearing net can be folded, U-shaped frame body is installed in the front end of crane boom by adjustable connecting frame, mobile construction can be flexibly carried out, adjustable connecting frame can adjust the pitch angle and horizontal rotation angle of spanning frame netting platform, so that spanning frame can adapt to different construction scenes and needs, improve the convenience and flexibility of use;Telescopic cable-stayed cable symmetrically arranged on left and right sides can be pre-tightening force and front, rear automatic cloth net mechanism is synchronously lengthened or shortened in front and back, enhance the carrying capacity of netting platform, also improve the flatness of netting platform bearing surface, solve the problem of fixed size, cloth net uneven of traditional spanning frame, significantly improve the adaptability and safety of large-span construction;The setting of roller can reduce the resistance when wire is pulled through.

[0007] As a preferred technical means: the front automatic netting mechanism comprises two front electric winches, two front curved arms and a front tension steel pipe, the front electric winches and the front curved arms are connected to the front side of the cross beam, and the front electric winches are located above the front curved arms, the front electric winches are provided with front load-bearing nets which can be horizontally unfolded and folded, the front end of the front load-bearing net is fixedly connected with the front tension steel pipe, the front end of the front curved arm is rotatably connected with the front tension steel pipe, and the axial direction of the front tension steel pipe is left-right direction; the rear automatic netting mechanism comprises two rear electric winches, two rear curved arms and a rear tension steel pipe, the rear electric winches and the rear curved arms are connected to the rear side of the cross beam, and the rear electric winches are located above the rear curved arms, the rear electric winches are provided with rear load-bearing nets which can be horizontally unfolded and folded, the rear end of the rear load-bearing net is fixedly connected with the rear tension steel pipe, the rear end of the rear curved arm is rotatably connected with the rear tension steel pipe, and the axial direction of the rear tension steel pipe is left-right direction. The structure effectively realizes the function of automatic netting, realizes automatic netting control of the load-bearing net, and the left-right symmetrical structure also makes the overall stress of the crossing frame more uniform, and improves the stability and safety of the crossing frame.

[0008] As a preferred technical means: the left and right ends of the rear tension steel pipe are connected with rear anchor cable wind ropes respectively, and the lower end of the rear anchor cable wind rope is connected to the tail of the crane rotary table. This design can further improve the carrying capacity of the net sealing platform, especially the load-bearing capacity of the front platform, so that the crossing frame can better bear the pressure of the overhead power transmission line during use, and the safety and reliability of the crossing frame are improved, and the rear cable wind mechanism can rotate with the platform, without affecting the overall operation and use flexibility of the crossing frame.

[0009] As a preferred technical means: the left side column is inclined to the left outer side from bottom to top, and the right side column is inclined to the right outer side from bottom to top. The structure that the side column is inclined to the outer upper side can slide the wire to the middle part of the cross beam when the wire above falls accidentally, can better bear the load, and makes the overall structure of the crossing frame more stable, and enhances the wind resistance and overall stability of the crossing frame.

[0010] As a preferred technical means: the U-shaped frame body is a steel structure frame body constructed by a section steel, and the cross section shape of the U-shaped frame body is rectangular. The rectangular steel structure frame body constructed by the section steel has high strength and stability, the hollow inside is convenient for setting various mechanism components, the structure of the crossing frame is more regular, and the overall carrying capacity of the crossing frame is also improved.

[0011] As a preferred technical means: the inside left and right sides of the cross beam are respectively provided with a curved arm driving mechanism, and the driving shaft of each curved arm driving mechanism is connected with the front curved arm and the rear curved arm on the same side through two connecting rods. The stretching and retracting actions of the curved arms are more synchronized and coordinated, which can ensure the consistency of the two sides during the unfolding and folding of the load-carrying net, improve the effect of net deployment and folding, and also enhance the overall stability and reliability of the crossing frame.

[0012] As a preferred technical means: the stretching length of the front curved arm is 1.5-2.2 times that of the rear curved arm. According to the actual construction requirements, the coverage range of the front and rear load-carrying nets can be reasonably distributed, so that the crossing frame can better protect the overhead power transmission lines and the like when crossing different facilities, improving the applicability and flexibility of the crossing frame, and also being conducive to optimizing the overall structure and stress distribution of the crossing frame.

[0013] As a preferred technical means: the adjacent ends of the two front electric winches are connected to the same coaxial front chain gear, and are connected to the front driving motor inside the cross beam through a chain; the adjacent ends of the two rear electric winches are connected to the same coaxial rear chain gear, and are connected to the rear driving motor inside the cross beam through a chain. The tension of the left and right sides during the unfolding and folding of the load-carrying net can be ensured, the quality of net deployment and folding is improved, and the electric winches are also convenient to control and maintain, improving the automation degree and use efficiency of the crossing frame. Of course, the driving motor can also be a hydraulic motor and the like.

[0014] As a preferred technical means: the adjustable connecting frame includes a bottom frame, a support frame in the middle, and a hydraulic rotary support at the top. The bottom frame is provided with a pin shaft connecting mechanism at the bottom, which is adjustable in length and width spacing for connecting with different crane booms. The hydraulic rotary support is connected and fixed with the upper cross beam. The lower end of the support frame is integrally connected with the bottom frame, the rear side of the bottom of the hydraulic rotary support is rotatably connected with the upper end of the support frame, and the front side of the bottom of the hydraulic rotary support and the front side of the upper end of the bottom frame are connected with a pitch adjusting hydraulic cylinder. The pin shaft connecting mechanism at the bottom of the bottom frame can adjust the length and width spacing, and can be connected with different crane booms, improving the versatility of the crossing frame. The horizontal rotation angle of the crossing frame is adjusted through the hydraulic rotary support, and the pitch angle of the crossing frame is adjusted through the pitch adjusting hydraulic cylinder. The pin shaft connecting mechanism can adjust the length and width spacing, and can be connected with different crane booms, improving the versatility of the crossing frame, facilitating the use in different construction scenes, and enhancing the adaptability and operation convenience of the crossing frame.

[0015] As a preferred technical means: the automatic telescopic mechanism of the telescopic cable-stayed cable is arranged in the left column and the right column, and the telescopic end of the telescopic cable-stayed cable is connected with the end of the corresponding tension steel pipe. The telescopic cable-stayed cable can better cooperate with the front and rear automatic net laying mechanisms, and synchronously elongate or shorten with the pre-tightening force during the telescoping of the curved arm, thereby effectively enhancing the load bearing capacity of the curved arm and further improving the load bearing capacity and stability of the net sealing platform. Meanwhile, the stretching control mechanism is arranged in the column, so that the structure of the span frame is more compact, and the installation and maintenance are facilitated.

[0016] Beneficial effects: the device can conveniently realize automatic net laying operation in the front and rear directions, the extension lengths of the front and rear load bearing nets can be flexibly set according to the site conditions, the load bearing nets can be folded when not in use, the U-shaped frame body can be installed at the front end of different crane jibs through the adjustable connecting frame, flexible mobile construction can be carried out, the universality of the span frame is improved, the span frame is conveniently used in different construction scenes, the adaptability and operation convenience of the span frame are enhanced, the adjustable connecting frame can adjust the pitch angle and horizontal rotation angle of the net sealing platform of the span frame, so that the span frame can adapt to different construction scenes and requirements, and the convenience and flexibility of use are improved, the telescopic cable-stayed cables arranged on the left and right sides can synchronously elongate or shorten with the front and rear automatic net laying mechanisms in the front and rear directions, the load bearing capacity of the net sealing platform is enhanced, meanwhile, the flatness of the bearing surface of the net sealing platform is improved, the problems of fixed size and uneven net laying of the traditional span frame are solved, and the adaptability and safety of large-span construction are significantly improved, and the setting of the roller shaft can reduce the resistance of the wire during traction. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a schematic view of the span frame in a folded state.

[0018] Figure 2 is a schematic view of the span frame in an unfolded state.

[0019] Figure 3 is a schematic view of the span frame in an unfolded state. Figure 2 is an enlarged schematic view of part A in the span frame.

[0020] Figure 4 is a schematic view of the driving connection between the curved arm and the electric winch in the span frame.

[0021] Figure 5 is a schematic view of the adjustable connecting frame structure in the span frame.

[0022] In the figure: 1, U-shaped frame body; 2, front automatic net laying mechanism; 3, rear automatic net laying mechanism; 4, adjustable connecting frame; 5, crane jib; 6, telescopic cable-stayed cable; 7, roller; 8, rear anchoring cable wind rope; 9, crane slewing ring; 10, curved arm driving hydraulic cylinder; 11, connecting rod; 12, front chain gear; 13, front driving motor; 14, rear chain gear; 15, rear driving motor; 16, chain; 17, fixed pulley; 18, automatic take-up reel; 101, cross beam; 102, left side column; 103, right side column; 201, front electric reel; 202, front curved arm; 203, front tension steel pipe; 204, front load-bearing net; 301, rear electric reel; 302, rear curved arm; 303, rear tension steel pipe; 304, rear load-bearing net; 401, base frame; 402, support frame; 403, hydraulic rotary support; 404, pin shaft connecting mechanism; 405, pitch adjusting hydraulic cylinder; 601, left front cable-stayed cable; 602, left rear cable-stayed cable; 603, right front cable-stayed cable; 604, right rear cable-stayed cable. DETAILED DESCRIPTION

[0023] The technical solutions of the present application are further described in detail below in combination with the accompanying drawings of the specification.

[0024] In the description of the present application, it should be understood that the terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation. Since the disclosed embodiments of the present application can be arranged in different directions, these orientation-indicating terms are only used as illustrations and should not be regarded as limitations. For example, "upper", "lower" do not necessarily mean the direction opposite or consistent with the direction of gravity.

[0025] Embodiment one

[0026] As Figures 1-3As shown, a mobile spanning frame capable of automatically deploying a telescopic cloth net includes a U-shaped frame body 1, a front automatic net deploying mechanism 2 capable of automatically deploying a load-bearing net forward, a rear automatic net deploying mechanism 3 capable of automatically deploying a load-bearing net backward, and an adjustable connecting frame 4 capable of adjusting the pitch angle and the horizontal rotation angle, the U-shaped frame body 1 includes a horizontal crossbeam 101 at the bottom, a left side column 102 and a right side column 103 above the left and right sides of the crossbeam 101, the crossbeam 101 is connected and fixed to the upper surface of the adjustable connecting frame 4, the adjustable connecting frame 4 is connected and fixed to the front end of a crane boom 5, the front automatic net deploying mechanism 2 and the rear automatic net deploying mechanism 3 are both left-right symmetrical structures, the front automatic net deploying mechanism 2 is connected to the front side of the crossbeam 101, the extension end of the front automatic net deploying mechanism 2 can extend and retract the net forward, the rear automatic net deploying mechanism 3 is connected to the rear side of the crossbeam 101, the extension end of the rear automatic net deploying mechanism 3 can extend and retract the net backward, the spanning frame is symmetrically provided with telescopic stay cables 6 on the left and right sides, the telescopic stay cables 6 can bring pre-tightening force to synchronously extend or shorten the front and rear automatic net deploying mechanisms 2 and 3, the front and rear sides of the crossbeam 101 of the U-shaped frame body 1 are provided with rollers 7 with the axial direction being left-right, the rollers 7 include long rollers and short rollers, there are two groups of long rollers, each group has four long rollers arranged on the front and rear sides of the crossbeam 101 in the left-right direction, there are two groups of short rollers, each group has three short rollers, the short rollers are arranged in series between the two groups of long rollers, and the position of each short roller is located in the adjacent end region of the two adjacent long rollers in the same group, the shaft length of the short roller is greater than the adjacent end distance of the two adjacent long rollers in the same group, so that the passing conductor can not fall into the end gap between the adjacent long rollers. In this embodiment, the rollers are nylon rollers.

[0027] In order to realize the connecting structure of the automatic netting mechanism, the front automatic netting mechanism 2 comprises two front electric winches 201, two front curved arms 202 and a front tension steel pipe 203, the front electric winches 201 and the front curved arms 202 are connected to the front side of the cross beam 101, and the front electric winches 201 are located above the front curved arms 202, each of the front electric winches 201 is respectively provided with a front load-bearing net 204 which can be horizontally unfolded and folded, the front end of the front load-bearing net 204 is fixedly connected with the front tension steel pipe 203, the front ends of the two front curved arms 202 are rotatably connected with the front tension steel pipe 203 in a hinged manner, and the axial direction of the front tension steel pipe 203 is left-right direction; the rear automatic netting mechanism 3 comprises two rear electric winches 301, two rear curved arms 302 and a rear tension steel pipe 303, the rear electric winches 301 and the rear curved arms 302 are connected to the rear side of the cross beam 101, and the rear electric winches 301 are located above the rear curved arms 302, each of the rear electric winches 301 is respectively provided with a rear load-bearing net 304 which can be horizontally unfolded and folded, the rear end of the rear load-bearing net 304 is fixedly connected with the rear tension steel pipe 303, the rear ends of the two rear curved arms 302 are rotatably connected with the rear tension steel pipe 303 in a hinged manner, and the axial direction of the rear tension steel pipe 303 is left-right direction. The front curved arms 202 and the rear curved arms 302 are connected to the same height position of the side surface of the cross beam 101, and the front electric winches 201 and the rear electric winches 301 are connected to the same height position of the cross beam 101. The connecting structure of the automatic netting mechanism is effectively realized, the automatic netting control of the load-bearing net is realized, the left-right symmetrical structure also makes the overall stress of the crossing frame more uniform, and the stability and safety of the crossing frame are improved. In the embodiment, the load-bearing net is a nylon load-bearing net.

[0028] In order to facilitate manufacturing, the U-shaped frame body 1 is a steel structure frame body constructed by angle steel, the cross beam 101 of the U-shaped frame body 1 has a square cross section, and the side column has a rectangular cross section. The steel structure frame body constructed by angle steel is convenient to manufacture, light in weight, high in cost performance, has high strength and stability, hollow inside to facilitate the arrangement of various mechanism components, so that the structure of the crossing frame is more compact and regular, which is beneficial to improve the overall carrying capacity of the crossing frame and reduce the space occupation after folding, and facilitates the movement and storage.

[0029] In order to make the extension and retraction actions of the curved arms more synchronous and coordinated, the front curved arms 202 and the rear curved arms 302 are respectively provided with a front curved arm tension spring 205 and a rear curved arm tension spring 305, the front curved arm tension spring 205 and the rear curved arm tension spring 305 are respectively arranged between the front curved arms 202 and the rear curved arms 302 and the cross beam 101, and the front curved arm tension spring 205 and the rear curved arm tension spring 305 are respectively arranged in the front curved arms 202 and the rear curved arms 302. Figure 4As shown, the inside left and right sides of the cross beam 101 are each provided with a curved arm driving mechanism, and the front curved arm 202 and the rear curved arm 302 are both two-section horizontally foldable and extendable structures, wherein the first section is rotatably connected with the cross beam 101 through a pin shaft, and the second section is hingedly connected with the tension steel pipe, and the rotatable connection structure between the first section and the second section adopts a pin shaft connection, and in the embodiment, the curved arm driving mechanism adopts a curved arm driving hydraulic oil cylinder 10, the end of the driving shaft of the curved arm driving hydraulic oil cylinder 10 is rotatably connected with two connecting rods 11 of the same shape and size, the two connecting rods 11 are respectively rotatably connected with the first sections of the same side front curved arm 202 and rear curved arm 302, and the connection structure is a structure symmetrical to the front and back of the cross beam 101, and the front curved arm 202 and the rear curved arm 302 are both rotatably connected with the cross beam 101, and each tension steel pipe is hingedly connected with the second sections of two front curved arms 202 or rear curved arms 302. Under the driving of the curved arm driving hydraulic oil cylinder 10, the horizontal telescopic folding or extending actions of the front curved arm 202 and the rear curved arm 302 are more synchronous and coordinated, which can ensure the consistency of the actions of the front and back sides of the load-bearing net during the unfolding and folding processes, improve the effect of netting and folding, and also enhance the overall stability and reliability of the crossing frame.

[0030] In order to improve the applicability and flexibility of the crossing frame, the extending length of the front curved arm 202 is twice the extending 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 section shape of the front curved arm 202 and the rear curved arm 302 is rectangular. According to actual construction needs, the coverage ranges of the front and rear load-bearing nets can be reasonably distributed, so that the crossing frame can better protect the overhead power transmission line and the like when crossing different facilities, improve the applicability and flexibility of the crossing frame, and also be beneficial to optimizing the overall structure and stress distribution of the crossing frame. The high-strength aviation aluminum alloy has high strength and light weight, can reduce the weight of the crossing frame itself, the rectangular shape is convenient for ensuring the coplanar characteristics after the connection of the first section and the second section, and is convenient for realizing the connection structure through multiple connecting ears at the rotatable connection part, and the connection is more stable and reliable.

[0031] In order to improve the netting quality, such as Figure 4As shown, the adjacent ends of the two front electric winding drums 201 are connected to the same front chain gear 12 coaxial with the two front electric winding drums 201, and are connected to the front drive motor 13 inside the crossbeam 101 through the chain 16; the adjacent ends of the two rear electric winding drums 301 are connected to the same rear chain gear 14 coaxial with the two rear electric winding drums 301, and are connected to the rear drive motor 15 inside the crossbeam 101 through the chain 16, and the front drive motor 13 and the rear drive motor 15 are both servo motors. It can ensure that the tension on both sides of the load-carrying net is consistent during the unfolding and folding process, improve the quality of the net deployment and folding, and also facilitate the control and maintenance of the electric winding drum, improve the automation degree and use efficiency of the crossing frame, and through the use of two relatively short front electric winding drums 201 each connected to a smaller width load-carrying net for combined deployment, it can avoid the unevenness of the deployment caused by the rotation deviation of a long electric winding drum, and improve the reliability.

[0032] In order to realize angle adjustment and realize connection with different crane booms 5, as shown, Figure 5 As shown, the adjustable connecting frame 4 includes a bottom frame 401 at the bottom, a support frame 402 at the middle and a hydraulic rotary support 403 at the top, the bottom frame 401 is provided with a pin shaft connecting mechanism 404 with adjustable length and width spacing for connecting with different crane booms 5, the hydraulic rotary support 403 is connected and fixed with the bottom of the crossbeam 101 above, the support frame 402 is a herringbone structure in left and right visual direction, the lower end of the support frame 402 is integrally connected with the bottom frame 401, the rear side of the bottom of the hydraulic rotary support 403 is rotatably connected with the left and right two support points of the upper end of the support frame 402, the front side of the bottom of the hydraulic rotary support 403 and the front side of the upper end of the bottom frame 401 are connected with two pitch adjustment hydraulic cylinders 405, the inside of the crossbeam 101 is provided with a lithium electric hydraulic power unit, the hydraulic power unit is connected with the pitch adjustment hydraulic cylinder 405, the electric winding drum, the boom drive hydraulic cylinder 10 and the hydraulic rotary support 403 to provide power, in this embodiment, the bottom frame 401 and the support frame 402 are both welded with rectangular steel pipes, and the bottom frame 401 and the support frame 402 are also welded. The hydraulic power unit provides power for the horizontal rotation of the crossing frame, the adjustment of the pitch angle, the extension and retraction of the boom and the extension and retraction of the load-carrying net, the pin shaft connecting mechanism 404 at the bottom of the bottom frame 401 can adjust the length and width spacing, and can be connected with different crane booms 5, improving the versatility of the crossing frame; the rotary angle adjustment of the crossing frame is realized through the hydraulic rotary support 403, the pitch angle adjustment of the crossing frame is realized through the pitch adjustment hydraulic cylinder 405, the pin shaft connecting mechanism 404 can adjust the length and width spacing, and can be connected with different crane booms 5, improving the versatility of the crossing frame, facilitating the use in different construction scenes, and enhancing the adaptability and operation convenience of the crossing frame.

[0033] In order to realize the telescopic structure of the stay cable, as shown,Figure 3 As shown, the automatic telescopic mechanism of the telescopic stay cable 6 adopts four automatic take-up reels 18 driven by reel spring, two of which are arranged in the left side column 102 and the other two are arranged in the right side column 103. The telescopic stay cable 6 includes a left front stay cable 601, a left rear stay cable 602, a right front stay cable 603 and a right rear stay cable 604. One end of the left front stay cable 601 is connected to the automatic take-up reel 18 on the front side of the left side column 102 through the deflecting pulley 17 on the upper front side of the left side column 102, and the other end of the left front stay cable 601 is fixedly connected with the left end of the front tension steel pipe 203. One end of the right front stay cable 603 is connected to the automatic take-up reel 18 on the front side of the right side column 103 through the deflecting pulley 17 on the upper front side of the right side column 103, and the other end of the right front stay cable 603 is fixedly connected with the right end of the front tension steel pipe 203. One end of the left rear stay cable 602 is connected to the automatic take-up reel 18 on the rear side of the left side column 102 through the deflecting pulley 17 on the upper rear side of the left side column 102, and the other end of the left rear stay cable 602 is fixedly connected with the left end of the rear tension steel pipe 303. One end of the right rear stay cable 604 is connected to the automatic take-up reel 18 on the rear side of the right side column 103 through the deflecting pulley 17 on the upper rear side of the right side column 103, and the other end of the right rear stay cable 604 is fixedly connected with the right end of the rear tension steel pipe 303. The telescopic connection structure of the telescopic stay cable 6 enables the telescopic stay cable 6 to better cooperate with the front and rear automatic netting mechanisms 3, and synchronously elongate or shorten with the pre-tightening force when the curved arm telescopes, thereby effectively enhancing the load bearing capacity of the curved arm and further improving the load bearing capacity and stability of the netting platform. Meanwhile, the stretching control mechanism is arranged in the column, so that the structure of the spanning frame is more compact, and the installation and maintenance are facilitated.

[0034] During construction, first, according to the actual operation spanning scene, the corresponding crane is selected, the length and width interval of the pin seat of the adjustable connecting frame 4 bottom pin shaft connecting mechanism 404 is adjusted to be consistent with the connecting 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 shaft connecting mechanism 404, the crane boom 5 is supported according to the height and position of the netting, so that the height position and angle of the crane boom 5 are consistent with the netting operation, the operator remotely controls the front and rear automatic netting mechanisms 2 and 3, and when the netting, the telescopic stay cable 6 with the pre-tightening force synchronously elongates forward and backward with the front and rear automatic netting mechanisms 2 and 3, if the horizontal angle and the pitch angle of the netting need to be adjusted, the corresponding angle adjustment of the adjustable connecting frame 4 is remotely controlled. When a relatively wide netting area is needed, two spanning frames are respectively arranged on both sides of the spanning area through two cranes, and the front ends of the spanning frames are arranged towards each other to form a longer spanning load bearing net combination. When the spanning conductor is pulled through the spanning frame load bearing net, the conductor is in rolling contact with the roller 7, which can reduce the pulling resistance and improve the pulling effect.

[0035] The device can conveniently realize automatic netting operation in the front-back direction. When not in use, the load-bearing net can be folded at the horizontal beam 101, and after the crane boom 5 is retracted, the construction site can be moved, flexible mobile construction can be carried out, the crossing frame can adapt to different construction scenes and needs, and the convenience and flexibility of use are improved. The telescopic cable 6 can bring pre-tightening force and the front-back automatic netting mechanism 3 can be synchronously elongated or shortened in the front-back direction, thereby enhancing the carrying capacity of the netting platform and improving the flatness of the netting platform bearing surface, solving the problems of fixed size of the traditional crossing frame and uneven netting, and significantly improving the adaptability and safety of large-span construction.

[0036] Embodiment two

[0037] Different from the above embodiment one, the left and right ends of the rear tension steel pipe 303 are connected with a rear anchoring cable 8 respectively, the lower end of the rear anchoring cable 8 is connected to the crane turret 9, after the netting operation is completed, the two rear anchoring cables 8 are tightened, and the lower end of the rear anchoring cable 8 is fixed after being tightened at the rear of the crane turret 9. The carrying capacity of the netting platform is further improved, especially the carrying capacity of the front platform is enhanced, so that the crossing frame can better withstand the pressure of the overhead power transmission line during use, and the safety and reliability of the crossing frame are improved, and the rear cable mechanism can rotate with the platform, without affecting the overall operation and use flexibility of the crossing frame.

[0038] Embodiment three

[0039] Different from the above embodiment one or two, the left column 102 is inclined to the left outer side from bottom to top, and the right column 103 is inclined to the right outer side from bottom to top. The structure of the outer upper side of the side column, when the overhead wire falls accidentally, the load is slid to the middle of the beam, so that the overall structure of the crossing frame is more stable, and the wind resistance and overall stability of the crossing frame are enhanced.

[0040] The above-mentioned mobile crossing frame capable of automatically expanding and telescoping the netting is a specific embodiment of the present application, which has embodied the outstanding substantial features and significant progress of the present application. According to the actual use needs, equivalent modifications can be made to the shape, structure, etc. under the inspiration of the present application, which are all within the protection scope of the present application.

Claims

1. A mobile crossing frame capable of automatically deploying a telescopic net, characterized in that: The system includes a U-shaped frame, a front automatic netting mechanism that automatically extends forward to arrange the load-bearing net, a rear automatic netting mechanism that automatically extends backward, and an adjustable connecting frame that can adjust the pitch and horizontal rotation angles. The U-shaped frame includes a horizontal beam at the bottom, a left column and a right column on either side of the beam. The beam is fixed to the adjustable connecting frame, which is fixed to the front end of the crane boom. Both the front and rear automatic netting mechanisms are symmetrical. The netting mechanism is connected to the front side of the crossbeam. The extension end of the front automatic netting mechanism can extend forward to lay the net and retract to retrieve the net. The rear automatic netting mechanism is connected to the rear side of the crossbeam. The extension end of the rear automatic netting mechanism can extend backward to lay the net and retract to retrieve 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-tensioned and extend or shorten synchronously in the front and rear directions with the front and rear automatic netting mechanisms. The front and rear sides of the crossbeam of the U-shaped frame are provided with multiple rollers with the axial direction in the left and right direction. The aforementioned front automatic netting mechanism includes two front electric drums, two front curved arms, and a front tensioning steel pipe. The front electric drums and the front curved arms are connected to the front side of the crossbeam, and the front electric drums are located above the front curved arms. The front electric drums are equipped with a front load-bearing net that can be horizontally unfolded and retracted. The front end of the front load-bearing net is fixedly connected to the front tensioning steel pipe. The front end of the front curved arms is rotatably connected to the front tensioning steel pipe. The axial direction of the front tensioning steel pipe is left-right. The aforementioned rear automatic netting mechanism includes two rear electric drums, two rear curved arms, and a rear tensioning steel pipe. The rear electric drums and the rear curved arms are connected to the rear side of the crossbeam, and the rear electric drums are located above the rear curved arms. The rear electric drums are equipped with a rear load-bearing net that can be horizontally unfolded and retracted. The rear end of the rear load-bearing net is fixedly connected to the rear tensioning steel pipe. The rear end of the rear curved arms is rotatably connected to the rear tensioning steel pipe. The axial direction of the rear tensioning steel pipe is left-right.

2. The mobile crossing frame capable of automatically deploying telescopic netting according to claim 1, characterized in that: The left and right ends of the rear tensioning steel pipe are each connected to a rear anchoring cable, and the lower end of the rear anchoring cable is connected to the tail of the crane turntable.

3. A mobile crossing frame capable of automatically deploying a telescopic netting according to claim 1, characterized in that: The left column is inclined from bottom to top and to the left and outward, and the right column is inclined from bottom to top and to the right and outward.

4. A mobile crossing frame capable of automatically deploying a telescopic netting according to claim 1, characterized in that: The U-shaped frame is a steel structure frame constructed using steel profiles, and the cross-sectional shape of the U-shaped frame is rectangular.

5. A mobile crossing frame capable of automatically deploying a telescopic netting according to claim 1, characterized in that: The crossbeam has a crank arm drive mechanism on its left and right sides. The drive shaft of each crank arm drive mechanism is connected to the front crank arm and the rear crank arm on the same side by two connecting rods.

6. A mobile crossing frame capable of automatically deploying a telescopic netting according to claim 5, characterized in that: The extension length of the front flexor arm is 1.5-2.2 times that of the extension length of the rear flexor arm, and the positions of the two front flexor arms are staggered vertically.

7. A mobile crossing frame capable of automatically deploying a telescopic netting according to claim 5, characterized in that: The adjacent ends of the two front electric drums are connected to the same coaxial front chain gear, and are connected to the front drive motor inside the crossbeam via a chain; the adjacent ends of the two rear electric drums are connected to the same coaxial rear chain gear, and are connected to the rear drive motor inside the crossbeam via a chain.

8. A mobile crossing frame capable of automatically deploying a telescopic netting according to claim 1, 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 equipped with a pin connection mechanism that allows for adjustment of both length and width spacing, for connecting with 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.

9. A mobile crossing frame capable of automatically deploying a telescopic netting according to claim 1, characterized in that: The automatic telescopic mechanism of the telescopic cable is located inside the left and right columns. The telescopic end of the cable is connected to the end of its corresponding tensioning steel pipe, and the rear end of the cable is wound in an elastic retractable reel.

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