Protective device for vehicle-mounted gantry crane and vehicle-mounted gantry crane

Abstract

The present invention discloses a protective device applied to a vehicle-mounted gantry crane and a vehicle-mounted gantry crane, wherein the protective device includes a main frame and a canopy, side canopies, and front and rear door curtains located on the main frame; the canopy can be expanded laterally as the legs of the gantry crane are swung open, and the canopy is provided with a roller plus rope telescopic mechanism, which can achieve longitudinal expansion; the side canopies can be expanded longitudinally, and the side canopies and the front and rear door curtains can be controlled at any position and can be lowered to the ground to form a closed working space. The present invention provides a comfortable working environment for the operator and improves the working efficiency. At the same time, in order to increase the amplitude and range of the operation, the protective device in the present invention is designed to be expandable longitudinally and transversely, and can be expanded to several times the width of the vehicle body in the transverse direction, and can be expanded to 0.8 times the length of the longitudinal beam of the gantry crane in the longitudinal direction, and the height direction of the protective device is the same as the working height of the gantry crane.

Description

Technical Field

[0001] The invention relates to the field of vehicle-mounted gantry cranes, and in particular to a vehicle-mounted gantry crane with a protective device. Background Art

[0002] The vehicle-mounted gantry crane (introduced in patent ZL201721732844.0) solves the problem of the inconvenience of gantry crane transfer and slow transfer speed, and saves the work of laying tracks on the ground, greatly improving the convenience of gantry crane use and site adaptability. However, gantry cranes are difficult to continue working in bad weather (such as rain, snow, strong wind, hail, lightning, etc.). Summary of the invention

[0003] The purpose of the present invention is to solve the environmental adaptability problem of the vehicle-mounted gantry crane, provide a comfortable working environment for the operator, and improve the working efficiency. At the same time, in order to improve the amplitude and scope of the operation, the protective device in the present invention is designed to be expandable in the vertical and horizontal directions, and can be expanded several times the width of the vehicle body in the horizontal direction, and can be expanded 0.8 times the length of the longitudinal beam of the gantry crane in the vertical direction. The height direction of the protective device is the same as the operating height of the gantry crane.

[0004] The present invention is implemented according to the following technical solutions:

[0005] The protective device applied to a vehicle-mounted gantry crane comprises a main frame and a canopy, side canopies and front and rear door curtains located on the main frame; the canopy can be expanded laterally as the legs of the gantry crane are swung open, and the canopy is provided with a roller plus rope telescopic mechanism to achieve longitudinal expansion; the side canopies can be expanded longitudinally, and the side canopies and front and rear door curtains can be controlled at any position and can all be lowered to the ground to form a closed working space.

[0006] Furthermore, the main frame includes a main longitudinal beam I and a main longitudinal beam II which are arranged symmetrically on the left and right, and a side beam I and a side beam II which are arranged symmetrically on the left and right; the side beam I and the side beam II are respectively located above the swing legs, and the side beam I and the side beam II are connected to the main longitudinal beam I and the main longitudinal beam II through a transverse telescopic beam; rollers are installed on both sides of the swing leg, and U-shaped grooves are opened on the side beams I and the side beams II, and the rollers are connected to the corresponding side beams; the swing leg swings, driving the rollers to move in a circular arc, and the transverse telescopic beam plays both a supporting and guiding role; the side beams I and the side beams II can only make lateral translational expansion movements to both sides under the restriction of the transverse telescopic beam.

[0007] Furthermore, the main frame also includes a main longitudinal expansion beam structure; the main longitudinal expansion beam structure includes a main longitudinal expansion beam I, a main longitudinal expansion beam II, and two sets of transverse telescopic arm beams; the main longitudinal expansion beam I and the main longitudinal expansion beam II are respectively hidden in the main longitudinal beam I and the main longitudinal beam II when stored, and when expanding and withdrawing, the rope is driven by the drum rotating in different directions to pull it out and in from the main longitudinal beam.

[0008] Furthermore, a rope is wound around the drum for multiple turns, one end of the rope is connected to one side of the main longitudinal expansion beam II, and the other end of the rope is connected to the other side of the main longitudinal expansion beam II. The drum is driven to rotate by a motor, thereby realizing the reciprocating telescopic motion of the main longitudinal expansion beam.

[0009] Furthermore, rope II is wrapped around drum II for multiple turns, one end of rope II is connected to one side of main longitudinal expansion beam II, and the other end of rope II is connected to the other side of main longitudinal expansion beam II; rope I is wrapped around drum I for multiple turns, one end of rope I is connected to one side of main longitudinal expansion beam I, and the other end of rope I is connected to the other side of main longitudinal expansion beam I; the two drums are driven to rotate by a set of power dual output shaft devices, thereby realizing the reciprocating telescopic motion of the main longitudinal expansion beam.

[0010] Furthermore, the main frame also includes a side beam extension beam structure; the side beam extension beam structure includes a side beam extension beam I and a side beam extension beam II; two groups of transverse telescopic beams fixed at the ends of the main longitudinal extension beam structure are respectively connected to the side extension beam I and the side extension beam II, the side beam extension beam I is slidably inserted into the side beam I, and the side beam extension beam II is slidably inserted into the side beam II, and the longitudinal extension and contraction of the main longitudinal extension beam structure drives the side extension beam I and the side extension beam II to extend and contract synchronously.

[0011] Furthermore, the side beam extension beam II includes a telescopic beam, a slide, a luffing cylinder, an extension leg, and a leveling cylinder; the telescopic beam is longitudinally extended and retracted in the cavity of the side beam II; the fixed end of the slide is fixed on the side beam II, and the movable end is fixed on the side extension beam II; the extension leg is hinged at the end of the telescopic beam, and the telescopic beam can be folded inside the telescopic beam by connecting the luffing cylinder; the leveling cylinder is connected to the end of the extension leg, and when the extension leg is extended to the position during operation, the leveling cylinder levels the entire system.

[0012] Furthermore, the front and rear door curtains include a slider assembly, a support seat, a bracket, a reel, a motor reducer assembly, a scissor mechanism, a lower crossbeam, a cloth belt, and a transverse connecting rope; the slider assembly is connected to the front curtain outer expansion slide and the front curtain inner expansion slide; the end face of the bracket is connected to the side expansion beam I and the side expansion beam II; the cloth belt is connected to the reel and the lower crossbeam respectively; the motor reducer assembly rotates with the reel to drive the lower crossbeam to move up and down; the bracket and the lower crossbar are connected by a scissor mechanism; the outermost hinges of the two columns of the two sets of scissor mechanisms are connected by transverse connecting ropes, and the cloth is connected to these hinges at the same time; the intersection of the middle rope or cloth belt and the transversely arranged rope is also connected to the cloth.

[0013] Furthermore, the hardtop includes a support frame, a hardtop protection I, a hardtop protection II, a side extension beam I, and a side extension beam II;

[0014] The hard canopy protection I and hard canopy protection II are connected to the side extension side beam I and the side extension side beam II respectively through the support frame; the hard canopy protection I and the hard canopy protection II are in a "7" shape, and a push rod support ear is arranged near the top of the hard canopy protection I and the hard canopy protection II; one end of the push rod is connected to the push rod support ear, and the other end is connected to the bracket; when retracting, the side extension side beam I and the side extension side beam II are retracted with the hard canopy protection I and the hard canopy protection II;

[0015] After the hard top protection I and the hard top protection II are retracted into place, the push rod connected to the hard top protection I is retracted, and the push rod connected to the hard top protection II is extended outward, thereby compacting the two tightly.

[0016] A vehicle-mounted gantry crane has the above-mentioned protective device applied to the vehicle-mounted gantry crane.

[0017] Beneficial effects of the present invention:

[0018] 1. The vehicle-mounted gantry crane with protective devices can withstand the influence of severe weather such as strong wind, rain, snow, hail, etc., and can realize all-day and all-weather operations, thereby effectively improving the efficiency of operations;

[0019] 2. The protective device is integrated on the gantry crane and transported with the vehicle, which greatly increases the adaptability of the site. There is no need to consider the impact of the environment and site on the tarpaulin installation;

[0020] 3. In the case of harsh working environment, it can reduce the impact on the surrounding environment;

[0021] 4. Longitudinal expansion uses the longitudinal beam of the gantry crane to effectively reduce the space of the protective device and increase the rigidity of the entire protective device;

[0022] 5. Use the power of the swinging legs to expand the protective device horizontally to reduce the power source;

[0023] 6. The drum plus wire rope mechanism is adopted to make the longitudinal expansion area larger;

[0024] 7. Use scissor mechanism to make side awning and door curtain, which effectively improves the wind resistance of side awning and door curtain;

[0025] 8. The canopy design combines soft and hard components to differentiate between working and transportation conditions, effectively reducing the difficulty of operating the system;

[0026] 9. The protective device can be expanded vertically and horizontally to effectively increase the working area;

[0027] 10. The front end of the longitudinal extension is equipped with outriggers to effectively increase wind resistance;

[0028] 11. After adding protective devices to the gantry crane, it can also be used as a temporary shed, or applied in emergency rescue, equipment maintenance, temporary command center, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 The driving posture of a vehicle-mounted gantry crane with protective devices;

[0031] Figure 2 Working posture for vehicle-mounted gantry crane with protective device;

[0032] Figure 3 It is the main frame of the protective device;

[0033] Figure 4 It is the schematic diagram of the horizontal expansion of the protective device;

[0034] Figure 5 This is the expanded view of the side beam;

[0035] Figure 6 It is the main longitudinal expansion beam;

[0036] Figure 7 The longitudinal expansion principle of the main longitudinal expansion beam;

[0037] Figure 8 Move the door curtain for the front curtain;

[0038] Fig. 9 It is a hardtop structure. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention. The embodiments of the present invention are described in detail below in conjunction with the drawings.

[0040] In the prior art, it is difficult for gantry cranes to continue to work in bad weather (such as rain, snow, strong wind, hail, lightning, etc.). The purpose of the present invention is to solve the environmental adaptability problem of vehicle-mounted gantry cranes, provide a comfortable working environment for operators, and improve work efficiency. At the same time, in order to increase the amplitude and scope of the operation, the protective device in the present invention is designed to be expandable vertically and horizontally, horizontally to several times the width of the vehicle body, and vertically to 0.8 times the length of the longitudinal beam of the gantry crane. The height direction of the protective device is the same as the operating height of the gantry crane.

[0041] It should be noted that the longitudinal direction herein refers to the length direction, and the transverse direction refers to the width direction.

[0042] like Figure 1 , Figure 2 As shown, the protective device applied to the vehicle-mounted gantry crane comprises a main frame and a canopy 1, side canopies 3 and front and rear door curtains 3 located on the main frame; the canopy 1 can be expanded laterally as the legs of the gantry crane are swung open, and the canopy 1 is provided with a roller and rope telescopic mechanism to achieve longitudinal expansion; the side canopy 2 can be expanded longitudinally, and the side canopy 2 and the front and rear door curtains 3 can be controlled at any position and can all be lowered to the ground to form a closed working space.

[0043] It should be noted that the canopy includes a basic canopy 1-1 and an extended canopy 1-2; the side canopy 2 includes a basic side canopy 2-1 and an extended side canopy 2-2; the front and rear door curtains 3 include an inner extended door curtain 3-1, a basic door curtain 3-2 and an outer extended door curtain 3-3.

[0044] like Figure 3As shown, the main frame mainly realizes lateral expansion and longitudinal beam expansion, and is composed of main longitudinal beam Ⅰ4.1.1, main longitudinal beam Ⅱ4.1.2, side beam Ⅰ4.1.3, side beam Ⅱ4.1.4, main longitudinal expansion beam Ⅰ4.1.5, main longitudinal expansion beam Ⅱ4.1.6, side expansion beam Ⅰ4.1.7, side expansion beam Ⅱ4.1.8, longitudinal expansion power device 4.1.9, lateral telescopic beam 4.1.10, etc. Side beam Ⅰ4.1.3 and side beam Ⅱ4.1.4 are arranged symmetrically on the left and right. Similarly, main longitudinal beam Ⅰ4.1.1 and main longitudinal beam Ⅱ4.1.2, main longitudinal expansion beam Ⅰ4.1.5 and main longitudinal expansion beam Ⅱ4.1.6 are also symmetrical on the left and right. Therefore, the following description only describes one side.

[0045] The side beams Ⅰ 4.1.3 and Ⅱ 4.1.4 are respectively located above the swing legs, and at the same time, the side beams Ⅰ 4.1.3 and Ⅱ 4.1.4 are connected to the main longitudinal beams Ⅰ 4.1.1 and Ⅱ 4.1.2 through the transverse telescopic beam 4.1.10.

[0046] Its principle is as follows Figure 4 As shown, the roller 4.2.1 is installed on the swing leg 4.1.11, and a U-shaped groove is opened on the side beam 24.1.4, and the roller 4.2.1 is connected to the side beam 24.1.4. The swing leg 4.1.11 swings through the swing leg cylinder 4.1.12, driving the roller 4.2.1 to make an arc motion, and the transverse telescopic beam 4.1.10 plays both a supporting and guiding role. The side beam I 4.1.3 and the side beam II 4.1.4 can only do a transverse translation and expansion motion to both sides under the restriction of the transverse telescopic beam 4.1.10.

[0047] Among them, the transverse telescopic beam 4.1.10 includes a transverse telescopic beam basic arm 4.1.10-1, a transverse telescopic beam 1 section telescopic arm 4.1.10-2, and a transverse telescopic rod 2 section telescopic arm 4.1.10-3.

[0048] like Figure 5As shown, the side beam extension beam Ⅰ 4.1.7 and the side beam extension beam Ⅱ 4.1.8 are arranged symmetrically on the left and right. The side beam extension beam Ⅱ 4.1.8 is mainly composed of a telescopic beam 4.1.8-1, a slide 4.1.8-2, a variable amplitude cylinder 4.1.8-3, an extension leg 4.1.8-4, a leveling cylinder 4.1.8-5, etc. The telescopic beam 4.1.8-1 is longitudinally extended in the cavity of the side beam Ⅱ 4.1.4, the slide 4.1.8-2 is fixed at the fixed end on the side beam Ⅱ 4.1.4, and the movable end is fixed on the side extension beam Ⅱ 4.1.8. The slide 4.1.8-2 has two main functions: one is to install the bracket for longitudinally extending the tarpaulin, and the other is to install the side tarpaulin extension tarpaulin. The extension leg 4.1.8-4 is deployed and recovered under the action of the variable amplitude cylinder 4.1.8-3. When working, after the extension legs 4.1.8-4 are extended to the position, the leveling cylinder 4.1.8-5 will level the whole system and provide enough support force to the extension legs 4.1.8-4. When recovering, the leveling cylinder 4.1.8-5 will be recovered to the bottom first, and then the legs will be recovered into the telescopic beam 4.1.8-3 through the amplitude cylinder 4.1.8-3. The side beam extension beam II 4.1.8 will be recovered together with the main longitudinal extension beam I 4.1.5 and the main longitudinal extension beam II 4.1.6.

[0049] The main longitudinal expansion beam structure is mainly composed of the main longitudinal expansion beam I 4.1.5, the main longitudinal expansion beam II 4.1.6, two sets of transverse telescopic arm beams 4.1.10, the front curtain outer expansion slide 4.4.1, the front curtain inner expansion slide 4.4.2, etc. Figure 6 When the main longitudinal extension beam Ⅰ 4.1.5 and the main longitudinal extension beam Ⅱ 4.1.6 are stored, they are hidden in the main longitudinal beam Ⅰ 4.1.1 and the main longitudinal beam Ⅱ 4.1.2 respectively. When expanding and withdrawing, the rope is driven by the drum rotating in different directions to pull it out and in from the main longitudinal beam, as shown in FIG. Figure 7As shown. Brief description of the principle: A rope 4.5.2 is wound around the drum 4.5.1 for 1 to 3 turns, one end of which is connected to the main longitudinal expansion beam Ⅱ4.1.6 at point B, and the other end of which is connected to the main longitudinal expansion beam Ⅱ4.1.6 at point D. When the motor drives the drum 4.4.1 to rotate counterclockwise, the length of the rope in the CD section decreases, the main longitudinal expansion beam Ⅱ4.1.6 moves to the C direction, and the length of the rope in the AB section increases, and the CD decrease ΔLcd is equal to the AB increase ΔLab. Similarly, when the drum 4.4.1 rotates clockwise, the length of the rope in the AB section decreases, the main longitudinal expansion beam Ⅱ4.1.6 moves to the A direction, and the length of the rope in the CD section increases, and the AB decrease ΔLab' is equal to the CD increase ΔLcd'. The present invention can use a rope to drive the main longitudinal expansion beam to reciprocate and retract, or the main longitudinal expansion beam Ⅰ4.1.5 and the main longitudinal expansion beam Ⅱ4.1.6 can use rollers 4.4.1 to carry ropes to realize reciprocating and retracting motion. In order to achieve a synchronous effect, a set of power dual output shaft devices is used to drive the two rollers 4.4.1. The two groups of transverse telescopic beams 4.1.10 fixed at the ends of the main longitudinal expansion beam are respectively connected to the side expansion beam Ⅰ4.1.7 and the side expansion beam Ⅱ4.1.8. The longitudinal expansion of the main longitudinal expansion beam drives the side expansion beam Ⅰ4.1.7 and the side expansion beam Ⅱ4.1.8 to synchronously expand and contract longitudinally. One end of the door curtain moving mechanism is connected to the side expansion beam, and the other end is connected to the front curtain outer expansion slide 4.4.1 or the front curtain inner expansion slide 4.4.2 through the slider assembly 4.6.1. The door curtain is horizontally expanded with the lateral expansion of the side expansion beam.

[0050] The structure of the door curtain is as follows Figure 8 As shown. The door curtain is mainly composed of a slider assembly 4.6.1, a support seat 4.6.2, a bracket 4.6.3, a reel 4.6.4, a motor reducer assembly 4.6.5, a scissor mechanism 4.6.6, a lower crossbeam 4.6.7, ropes or cloth belts 4.6.8, 4.6.9, 4.6.10, and a transverse connecting rope 4.6.11. The slider assembly 4.6.1 is connected to the front curtain outer extension slide 4.4.1 and the front curtain inner extension slide 4.4.2; the bracket end surface 4.6.3 is connected to the side extension beam Ⅰ 4.1.7 and the side extension beam Ⅱ 4.1.8. The ropes or cloth belts 4.6.8, 4.6.9, and 4.6.10 are respectively connected to the reel 4.6.4 and the lower crossbeam 4.6.7. The motor reducer assembly 4.6.5 rotates with the reel to drive the lower crossbeam 4.6.7 to move up and down. The support 4.6.3 and the lower crossbar 4.6.7 are connected by a scissor mechanism 4.6.6. The scissor mechanism 4.6.6 mainly serves as air support, guidance and wind resistance. The outermost hinges of the two rows of the two sets of scissor mechanisms 4.6.6 are connected by transverse connecting ropes 4.6.11, and the cloth is connected to these hinges. The intersection of the middle rope or cloth belt 4.6.9 and the transversely arranged rope is also connected to the cloth, such as Figure 8 All shaded areas shown are points connected to the cloth.

[0051] The principle of the side awning is the same as that of the door curtain, so I will not go into details again.

[0052] The canopy is connected with soft cloth. First expand horizontally to tighten the cloth horizontally, and then expand vertically. When recovering, recover the longitudinal part first, then recover the transverse part, that is, both expansion and recovery must ensure that the cloth is in a tightened state during longitudinal expansion and contraction. To facilitate drainage, the horizontal part is set to be high in the middle and low at both ends, and the longitudinal part is set to be high in the front and low in the back.

[0053] Considering the various problems of soft cloth in transportation, a hard canopy is also set up, such as Fig. 9 As shown. The hard canopy protection Ⅰ 4.7.2 and the hard canopy protection Ⅱ 4.7.4 are connected to the side extension side beam Ⅰ 4.1.7 and the side extension side beam Ⅱ 4.1.8 respectively through the support frame 4.7.1. The hard canopy protection Ⅰ 4.7.2 and the hard canopy protection Ⅱ 4.7.4 form a "7" shape, and a push rod support ear 4.7.5 is provided near the top of the hard canopy protection Ⅰ 4.7.2 and the hard canopy protection Ⅱ 4.7.4. One end of the push rod 4.7.3 is connected to the push rod support ear 4.7.5, and the other end is connected to the bracket 4.7.1. When retracting, the side extension side beam Ⅰ 4.1.7 and the side extension side beam Ⅱ 4.1.8 are retracted into place with the hard canopy protection Ⅰ 4.7.2 and the hard canopy protection Ⅱ 4.7.4. At this time, there will be a gap between the top of the hard canopy protection I 4.7.2 and the top of the hard canopy protection II 4.7.4. If they are not compacted, water will inevitably enter when it rains, and strong winds will also make the gap between the two larger and larger, and finally destroy the soft canopy inside the hard canopy. The present invention uses a push rod 4.7.3 to limit the gap between the two. After the hard canopy protection I 4.7.2 and the hard canopy protection II 4.7.4 are retracted, the push rod 4.7.3-1 connected to the hard canopy protection I 4.7.2 is retracted, and the push rod 4.7.3-2 connected to the hard canopy protection II 4.7.4 is extended outward, so that the two are tightly compacted.

[0054] In summary, the longitudinal expansion uses the longitudinal beam of the gantry crane to effectively reduce the space of the protective device while increasing the rigidity of the entire protective device; with the help of the power of the swing leg, the protective device is expanded horizontally to reduce the power source; the drum plus wire rope mechanism is adopted to make the longitudinal expansion area larger; the scissors mechanism is used to make the side canopy and door curtain, which effectively improves the wind resistance of the side canopy and door curtain; the canopy design that combines soft and hard is adopted to distinguish between working and transportation conditions, effectively reducing the operating difficulty of the system; the protective device can be expanded vertically and horizontally to effectively increase the working area; the front end of the longitudinal expansion is equipped with outriggers to effectively increase the wind resistance.

[0055] The present invention also provides a vehicle-mounted gantry crane 200 having the aforementioned protection device 100 applied to the vehicle-mounted gantry crane.

[0056] The vehicle-mounted gantry crane with protective devices is not afraid of the influence of severe weather such as strong winds, rain, snow, hail, etc., and can realize all-day and all-weather operations, thereby effectively improving the efficiency of operations; the protective devices are integrated on the gantry crane and transported with the vehicle, which greatly increases the adaptability to the site and there is no need to consider the influence of the environment and site on the construction of the tarpaulin; in the case of relatively harsh working environment, the impact on the surrounding environment can be reduced; after the protective devices are added to the gantry crane, it can also be used as a temporary shed, or applied to emergency rescue, equipment maintenance, temporary command center, etc.

[0057] Although the present application has been described with reference to typical embodiments, it should be understood that the terms used are illustrative and exemplary, rather than restrictive. Since the present application can be implemented in a variety of forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims, so all changes and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A protective device applied to a vehicle-mounted gantry crane, characterized in that: It includes a main frame and a canopy, side canopies, and front and rear door curtains located on the main frame; The canopy can be expanded horizontally as the gantry crane swings open, and the canopy is provided with a roller plus rope telescopic mechanism to achieve longitudinal expansion; The side canopy can be extended longitudinally, and the side canopy and the front and rear door curtains can be controlled at any position and can be lowered to the ground to form a closed working space; The main frame includes a main longitudinal beam I and a main longitudinal beam II arranged symmetrically on the left and right, and a side beam I and a side beam II arranged symmetrically on the left and right; The side beams I and II are respectively located above the swing legs, and the side beams I and II are connected to the main longitudinal beams I and II through transverse telescopic beams; Rollers are installed on both sides of the swing legs, U-shaped grooves are opened on the side beams I and II, and the rollers are connected to the corresponding side beams; The swinging leg drives the roller to move in a circular arc, and the horizontal telescopic beam plays both a supporting and guiding role; The side beams I and II can only move laterally and expand to both sides under the restriction of the transverse telescopic beams; The main frame also includes a main longitudinal expansion beam structure; The main longitudinal expansion beam structure includes a main longitudinal expansion beam I, a main longitudinal expansion beam II, and two sets of transverse expansion beams; The main longitudinal expansion beam I and the main longitudinal expansion beam II are respectively hidden in the main longitudinal beam I and the main longitudinal beam II when they are stored. When they are expanded and withdrawn, the ropes are driven by the drum rotating in different directions to pull them out and in from the main longitudinal beams. The main frame also includes a side beam extension beam structure; The side beam extension beam structure includes a side beam extension beam I and a side beam extension beam II; Two groups of transverse telescopic beams fixed at the ends of the main longitudinal expansion beam structure are respectively connected to the side beam expansion beam I and the side beam expansion beam II. The side beam expansion beam I is slidably inserted into the side beam I, and the side beam expansion beam II is slidably inserted into the side beam II. The longitudinal expansion and contraction of the main longitudinal expansion beam structure drives the side beam expansion beam I and the side beam expansion beam II to synchronously expand and contract longitudinally. The side beam extension beam II includes a telescopic beam, a slideway, a luffing cylinder, an extension leg, and a leveling cylinder; The telescopic beam is longitudinally telescopic in the cavity of the side beam II; the fixed end of the slideway is fixed on the side beam II, and the movable end is fixed on the side beam extension beam II; The extension legs are hinged at the ends of the telescopic beams, and the extension legs can be folded inside the telescopic beams by connecting the luffing cylinders; The leveling cylinder is connected to the end of the extended leg. When the extended leg is extended to the position during operation, the leveling cylinder levels the entire system. The front and rear door curtains include a slider assembly, a support seat, a bracket, a reel, a motor reducer assembly, a scissor mechanism, a lower crossbeam, a cloth belt and a transverse connecting rope; The slider assembly is connected to the front curtain outer extension slideway and the front curtain inner extension slideway; the bracket end surface is connected to the side beam extension beam Ⅰ and the side beam extension beam Ⅱ; The cloth belt is connected to the reel and the lower crossbeam respectively; the motor reducer assembly rotates the reel to drive the lower crossbeam to move up and down; the bracket and the lower crossbeam are connected by a scissor mechanism; The outermost hinges of the two rows of the two sets of scissor-fork mechanisms are connected by transverse connecting ropes, and the cloth is connected to these hinges at the same time; the middle cloth belt is also connected to the intersection of the transverse connecting ropes arranged laterally; Also includes a hardtop, the hardtop includes a support frame, a hardtop protection I, and a hardtop protection II; The hard top protection I and hard top protection II are connected to the side beam extension beam I and the side beam extension beam II respectively through the support frame; the hard top protection I and the hard top protection II are in a "7" shape, and a push rod support ear is arranged near the top of the hard top protection I and the hard top protection II; one end of the push rod is connected to the push rod support ear, and the other end is connected to the bracket; when retracting, the side beam extension beam I and the side beam extension beam II are retracted with the hard top protection I and the hard top protection II; After the hard top protection I and the hard top protection II are retracted into place, the push rod connected to the hard top protection I is retracted, and the push rod connected to the hard top protection II is extended outward, thereby compacting the two tightly.

2. The protective device for a vehicle-mounted gantry crane according to claim 1 is characterized in that: A rope is wound around the drum for multiple turns, one end of the rope is connected to one side of the main longitudinal expansion beam II, and the other end of the rope is connected to the other side of the main longitudinal expansion beam II. The drum is driven to rotate by a motor, thereby realizing the reciprocating telescopic motion of the main longitudinal expansion beam.

3. The protective device for a vehicle-mounted gantry crane according to claim 1 is characterized in that: Rope II is wound around drum II for multiple turns, one end of rope II is connected to one side of main longitudinal expansion beam II, and the other end of rope II is connected to the other side of main longitudinal expansion beam II; Rope I is wound around drum I for multiple turns, one end of rope I is connected to one side of main longitudinal expansion beam I, and the other end of rope I is connected to the other side of main longitudinal expansion beam I; The two rollers are driven to rotate by a set of power double output shaft devices, thereby realizing the reciprocating telescopic movement of the main longitudinal expansion beam.

4. Truck-mounted gantry crane, characterized by: A protective device applied to a vehicle-mounted gantry crane as claimed in any one of claims 1 to 3.

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