A gantry crane for construction site and operation method thereof

Abstract

The present invention belongs to the technical field of building construction equipment, and in particular relates to a gantry crane for use at a construction site, comprising: a load-bearing beam, support feet are arranged on both sides of the load-bearing beam; a load-bearing slide rail, the load-bearing slide rail is arranged on both sides of the load-bearing beam; a slide, the slide is slidably arranged on the load-bearing beam; a lifting structure, the lifting structure is arranged at the bottom of the slide; a moving wheel, the moving wheel is rotatably arranged on the inner side of the slide, and the moving wheel can be driven to rotate by a driving part; it also includes: a synchronous rack, the synchronous rack is arranged on the top of the load-bearing slide rail; a synchronous gear set, the synchronous gear set is rotatably arranged on the side wall of the load-bearing slide rail; a telescopic damping rod, the telescopic damping rod is arranged between the synchronous gear set and the moving wheel. Compared with the prior art, the present invention can effectively prevent the occurrence of slipping and improve the service life of the gantry crane.

Description

Technical Field

[0001] The invention belongs to the technical field of building construction equipment, and in particular relates to a gantry crane used at a construction site and an operating method thereof. Background Art

[0002] Gantry crane is Bridge crane A deformation of the gantry crane, which is mainly used for outdoor loading and unloading operations. Its metal structure is like a door-shaped frame, and two legs are installed under the load-bearing main beam. In construction, gantry cranes are widely used, such as a double-fixed gantry crane hanger for building bridge construction disclosed in the patent with application number CN201922363320.4, which relates to the technical field of building bridge construction. Two equal-length object limiting beams are connected in the middle section of the two sets of equipment support mechanisms. Limiting plates are fixedly welded at both ends of the two object limiting beams. The inner part of the limiting plate is penetrated The two object limiting beams are provided with adjusting bolts, which can limit and clamp the hoisted object when the object is hoisted and the whole gantry crane hanger moves along the runway, so as to prevent the swing of the hoisted object. The spacing between the two object limiting beams can be adjusted according to the actual width of the object, so as to play the most effective fixing role. The two limiting beams and the hooks connected with the hoisted object form a double fixing structure, which makes the whole hoisting process safer and improves the practicality of the existing gantry crane hanger. The structure is scientific and reasonable, and it is safe and convenient to use.

[0003] During the use of this existing gantry crane for construction, its slide rails or load-bearing beams are prone to slipping when they are wet or contaminated by dust particles, causing the lifting structure to be unable to stop moving in time or to be unable to move, which can easily cause safety accidents and reduce the stability of the crane. Therefore, it is necessary to make improvements. Summary of the invention

[0004] The purpose of the present invention is to provide a gantry crane for use on a construction site and an operating method thereof in order to improve the operating stability of the gantry crane and prevent the occurrence of safety accidents in view of the above-mentioned technical problems.

[0005] In view of this, the present invention provides a gantry crane for construction site, comprising:

[0006] A load-bearing beam, with supporting feet disposed on both sides of the load-bearing beam;

[0007] Load-bearing slide rails, which are arranged on both sides of the load-bearing beam;

[0008] A slide, the slide being slidably disposed on the load-bearing beam;

[0009] A lifting structure, wherein the lifting structure is arranged at the bottom of the slide;

[0010] A moving wheel, the moving wheel is rotatably arranged on the inner side of the slide, and the moving wheel can be driven to rotate by a driving unit;

[0011] Also includes:

[0012] A synchronous rack, wherein the synchronous rack is arranged on the top of the load-bearing slide rail;

[0013] A synchronous gear set, the synchronous gear set being rotatably arranged on the side wall of the load-bearing slide rail;

[0014] A telescopic damping rod, wherein the telescopic damping rod is arranged between the synchronous gear set and the moving wheel;

[0015] Among them, the synchronous gear is meshed with the synchronous rack, one end of the telescopic damping rod is movably connected to the synchronous gear set, and the other end is movably connected to the moving wheel. The telescopic damping rod does not telescope when the synchronous gear set and the moving wheel rotate simultaneously.

[0016] In the present technical scheme, when the gantry crane is in use, the slide moves along the load-bearing slide rail driven by the moving wheel. During the movement of the slide, the synchronous gear set moves with the movement of the slide and cooperates with the synchronous rack to rotate synchronously with the moving wheel. At this time, the telescopic damping rod does not telescope, and the moving wheel stops rotating after the movement is completed. When the slide causes the moving wheel to slip under the action of inertia, the synchronous rotation between the synchronous gear and the moving wheel is broken. At this time, the synchronous gear set rotates in cooperation with the synchronous rack driven by the movement of the slide, and the moving wheel no longer rotates, and the telescopic damping rod starts to telescope, thereby consuming kinetic energy in the process and preventing the slide from continuing to move, effectively preventing the slide from colliding due to slipping of the moving wheel when it stops, reducing the wear between the moving wheel and the load-bearing slide rail, and increasing the service life of the gantry crane.

[0017] In the above technical solution, further, it also includes:

[0018] A moving wheel reduction mechanism, the moving wheel reduction mechanism is arranged on the outside of the carriage, and the moving wheel reduction mechanism is drivingly connected to the wheel axle of the moving wheel;

[0019] Wherein, the moving wheel speed reduction mechanism can reduce the rotation speed of the moving wheel when the moving wheel slips.

[0020] In the above technical solution, further, the moving wheel deceleration mechanism also includes:

[0021] An outer shell, the outer shell being arranged on an outer surface of the slide;

[0022] A transmission shaft, the transmission shaft is in transmission connection with the wheel axle of the moving wheel, and an extension rod extending radially along the transmission shaft is provided at the outer end of the transmission shaft;

[0023] A friction ring, wherein the friction ring is arranged in the outer shell, and the inner ring surface of the friction ring is a friction surface;

[0024] The friction block is movably arranged on the top end of the extension rod, and the friction block can contact the friction surface of the friction ring as the rotation speed of the transmission shaft increases.

[0025] In the above technical solution, further, the moving wheel deceleration mechanism also includes:

[0026] A ball groove, the ball groove is arranged on the outer annular surface of the friction piece, and a ball is arranged in the ball groove;

[0027] A limiting ring, which is arranged in the outer shell and located outside the friction ring, and a movable gap is formed between the limiting ring and the friction ring;

[0028] A rotating disk, which is arranged on the transmission shaft and rotates synchronously with the transmission shaft, and a stop rod is arranged on the edge of the rotating disk;

[0029] Wherein, the end of the baffle is movably arranged in the movable gap between the limiting ring and the friction ring, and the baffle can rotate with the rotation of the rotating disk.

[0030] In the above technical solution, further, it also includes:

[0031] The slide rail cleaning mechanism is arranged on the inner side of the slide frame and is used for cleaning the surface of the load-bearing slide rail.

[0032] In the above technical solution, further, the slide rail cleaning mechanism also includes:

[0033] an exhaust fan, the exhaust fan being arranged on the outer surface of the slide;

[0034] An air outlet head is arranged on the inner side of the slide frame and can evenly blow air toward the surface of the load-bearing slide rail;

[0035] Wherein, the exhaust fan is connected to the air outlet through a connecting air duct.

[0036] In the above technical solution, further, the wind outlet head also includes:

[0037] An air outlet housing, the air outlet housing consisting of a first air outlet section, a second air outlet section and a third air outlet section, the first air outlet section is provided with an air inlet, and the third air outlet section is provided with an air outlet;

[0038] A guide plate, the guide plate is arranged in the air outlet housing, the guide plates have at least two pieces and are symmetrically distributed along the width direction of the air outlet housing, and the distance between the two guide plates increases from the air inlet to the air outlet;

[0039] A plurality of curtain panels, the plurality of curtain panels are arranged at the air outlet of the third air outlet section, the curtain panels extend along the width direction of the air outlet shell, and the plurality of curtain panels are evenly spaced and distributed along the height direction of the air outlet shell;

[0040] Among them, the internal height of the first air outlet section decreases from the air inlet to the air outlet, the internal height of the second air outlet section increases from the air inlet to the air outlet, and the internal height of the third air outlet section decreases from the air inlet to the air outlet, and a gap is set between the guide plate and the air inlet.

[0041] In the above technical solution, further, the slide rail cleaning mechanism also includes:

[0042] A rotating shaft, the rotating shaft being rotatably arranged on the inner side of the sliding frame through a fixed block;

[0043] A cam, wherein the cam is arranged on the rotating shaft and can rotate along with the rotating shaft;

[0044] A reciprocating rod, which is movably arranged below the cam and can reciprocate up and down under the action of the cam;

[0045] A water suction roller, the water suction roller is rotatably arranged at the bottom end of the reciprocating rod;

[0046] The cam and the reciprocating rod each have at least two reciprocating rods, and the two reciprocating rods move up and down alternately. One end of the rotating shaft is arranged in the connecting air duct and can be driven to rotate under the action of the airflow.

[0047] In the above technical solution, further, the present invention also discloses an operating method suitable for the above-mentioned gantry crane for construction site, comprising the following steps:

[0048] 1. The process includes the following steps:

[0049] S1 skids and brakes when stopped. When the gantry crane is in use, the carriage moves along the load-bearing rail driven by the moving wheel. At the same time, the synchronous gear cooperates with the synchronous rack to rotate synchronously with the moving wheel. The telescopic damping rod does not telescope. After the movement is completed, the moving wheel stops rotating. When the carriage causes the moving wheel to slip due to inertia, the synchronous rotation between the synchronous gear and the moving wheel is broken. At this time, the telescopic damping rod begins to telescope, thereby consuming kinetic energy in the process and preventing the carriage from continuing to move.

[0050] During the operation of S2, the slide is braked and the carriage moves along the load-bearing slide rail driven by the moving wheel. When the moving wheel slips, the friction between the moving wheel and the load-bearing slide rail is instantly reduced, resulting in a reduction in the traction of the moving wheel. The speed of the moving wheel increases sharply. At this time, driven by the transmission shaft, the extension rod rotates rapidly to throw out the friction block and make the friction block contact with the friction surface of the friction ring, thereby reducing the speed of the moving wheel through friction. At the same time, the limit ring is also rotating and driving the stop rod to continuously hit the ball that is also thrown out. After the speed of the moving wheel is reduced, the traction generated by the moving wheel is gradually restored to continue to drive the carriage to move.

[0051] S3 load-bearing slide rail cleaning. In the process of the moving wheel driving the slide to move, the exhaust fan generates airflow and transports the airflow to the air outlet through the connecting air pipe. The airflow is evenly distributed in the air outlet shell under the action of the guide plate. At the same time, the airflow is stabilized and accelerated to be discharged from the air outlet under the action of the first air outlet section, the second air outlet section and the third air outlet section. The airflow is divided into several layers of wind curtains when passing through several curtain panels. Finally, the airflow is sprayed to the surface of the load-bearing slide rail to blow away the impurities or moisture on the surface of the weighing slide rail, and the water-absorbing roller can further absorb moisture on the load-bearing slide rail on rainy days.

[0052] In the technical solution, the gantry crane can effectively prevent slipping when stopped and when running during use, thereby preventing excessive wear between the moving wheels and the load-bearing slide rails, and at the same time preventing the slide from slipping and colliding when stopped, thereby increasing the service life of the gantry crane, and the operation method is simple and reliable, and the gantry crane has high operating stability.

[0053] The beneficial effects of the present invention are:

[0054] 1. The setting of the synchronous gear set and the telescopic damping rod can effectively prevent the moving wheels from slipping due to the inertia of the slide when the slide stops, prevent excessive wear between the moving wheels and the load-bearing slide rails, and increase the service life of the gantry crane;

[0055] 2. The setting of the moving wheel deceleration mechanism can effectively prevent the moving wheel from slipping during operation. When the moving wheel slips during operation, the speed of the moving wheel can be effectively reduced, thereby ensuring that the traction of the moving wheel returns to normal;

[0056] 3. The slide rail cleaning device can effectively clean the surface of the load-bearing slide rail, thereby preventing impurities and moisture attached to the surface of the load-bearing slide rail from affecting the operation of the moving wheel, and effectively preventing the moving wheel from slipping. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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.

[0058] Figure 1 It is a schematic structural diagram of a specific implementation method of the present invention.

[0059] Figure 2 It is a schematic diagram of the inner structure of the slide of the present invention.

[0060] Figure 3 It is a schematic diagram of the structure of the moving wheel speed reduction mechanism of the present invention.

[0061] Figure 4 It is a schematic diagram of the friction ring structure of the present invention.

[0062] Figure 5 It is a schematic diagram of the structure of the wind outlet of the present invention.

[0063] Figure 6 It is a schematic diagram of the cross-sectional structure of the air outlet of the present invention.

[0064] Figure 7 It is a schematic diagram of the horizontal cross-section structure of the air outlet of the present invention.

[0065] Figure 8 It is a schematic diagram of the vertical cross-section structure of the air outlet of the present invention.

[0066] Fig. 9 It is a schematic diagram of the rotating shaft structure of the present invention.

[0067] Fig.10 It is a schematic diagram of the structure of the connection between the air duct and the rotating shaft of the present invention.

[0068] The symbols in the figure are:

[0069] 1. Load-bearing beam; 100. Support foot; 2. Load-bearing slide rail; 3. Slide; 4. Lifting structure; 5. Moving wheel; 6. Driving unit; 7. Synchronous rack; 8. Synchronous gear set; 9. Telescopic damping rod; 10. Moving wheel speed reduction mechanism; 11. Outer shell; 12. Transmission shaft; 13. Extension rod; 14. Friction ring; 15. Friction block; 16. Ball groove; 17. Ball; 18. Limiting ring; 19. Rotating plate; 20. Stop rod; 21. Slide rail cleaning mechanism; 22. Exhaust fan; 23. Air outlet; 230. Air outlet housing; 2301. First air outlet section; 2302. Second air outlet section; 2303. Third air outlet section; 231. Guide plate; 232. Curtain plate; 24. Rotating shaft; 25. Cam; 26. Reciprocating rod; 27. Water suction roller; 28. Transmission fan; 29. ​​Active bevel gear; 30. Driven bevel gear; 31. Connecting arm; 32. Fixed block. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0071] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0072] Embodiment 1:

[0073] The embodiment of the present application provides a gantry crane for a construction site, comprising: a load-bearing beam 1, support legs 100 are arranged on both sides of the load-bearing beam 1; a load-bearing slide rail 2, the load-bearing slide rail 2 is arranged on both sides of the load-bearing beam 1; a slide 3, the slide 3 is slidably arranged on the load-bearing beam 1; a lifting structure 4, the lifting structure 4 is arranged at the bottom of the slide 3; a moving wheel 5, the moving wheel 5 is rotatably arranged on the inner side of the slide 3, and the moving wheel 5 can be driven to rotate by a driving unit 6;

[0074] It also includes: a synchronous rack 7, which is arranged on the top of the load-bearing slide rail 2; a synchronous gear set 8, which is rotatably arranged on the side wall of the load-bearing slide rail 2; and a telescopic damping rod 9, which is arranged between the synchronous gear set 8 and the moving wheel 5.

[0075] Among them, the synchronous gear is meshed with the synchronous rack 7, one end of the telescopic damping rod 9 is movably connected to the synchronous gear set 8, and the other end is movably connected to the moving wheel 5. The telescopic damping rod 9 does not perform telescopic movement when the synchronous gear set 8 and the moving wheel 5 rotate simultaneously.

[0076] The load-bearing slide rail 2 is a conventional structure, including an upper slide and a lower slide extending outward from the upper and lower sides of the load-bearing beam 1. The slide 3 is a conventional structure, including a frame in the shape of a square frame. The driving part 6 also includes a conventional driving motor, which is installed on the outside of the slide 3. The driving motor can be connected to the axle of the moving wheel 5 through a gear transmission structure or a belt transmission structure to drive the moving wheel 5 to rotate. The synchronous gear set 8 includes two synchronous gears, one of which is meshed with the synchronous rack 7, and the other is connected to the telescopic damping rod 9.

[0077] When the moving wheel 5 is stopped, the synchronous rotation between the synchronous gear and the moving wheel 5 is broken. At this time, the synchronous gear set 8 rotates in cooperation with the synchronous rack 7 driven by the movement of the slide 3, and the moving wheel 5 no longer rotates. The telescopic damping rod 9 starts to telescope, thereby consuming kinetic energy in the process and preventing the slide 3 from continuing to move. The phenomenon of collision of the slide 3 due to the slipping of the moving wheel 5 when it stops is effectively prevented, thereby reducing the wear between the moving wheel 5 and the load-bearing slide rail 2 and improving the service life of the gantry crane.

[0078] Embodiment 2:

[0079] This embodiment provides a gantry crane for a construction site, which, in addition to the technical solutions of the above embodiments, also has the following technical features, and further includes: a reduction mechanism for a moving wheel 5, the reduction mechanism for the moving wheel 5 being arranged on the outer side of the slide 3, the reduction mechanism for the moving wheel 5 being in driving connection with the wheel axle of the moving wheel 5;

[0080] The speed reduction mechanism of the moving wheel 5 can reduce the rotation speed of the moving wheel 5 when the moving wheel 5 slips.

[0081] The reduction mechanism of the moving wheel 5 also includes: an outer shell 11, which is arranged on the outer surface of the slide 3; a transmission shaft 12, which is transmission-connected to the wheel axle of the moving wheel 5, and an extension rod 13 extending radially along the transmission shaft 12 is arranged at the outer end of the transmission shaft 12; a friction ring 14, which is arranged in the outer shell 11, and the inner ring surface of the friction ring 14 is a friction surface; a friction block 15, which is movably arranged at the top of the extension rod 13, and the friction block 15 can contact the friction surface of the friction ring 14 as the rotation speed of the transmission shaft 12 increases.

[0082] The speed reduction mechanism of the moving wheel 5 further includes: a ball 17 groove 16, the ball 17 groove 16 is arranged on the outer annular surface of the friction ring, and the ball 17 is arranged in the ball 17 groove 16; a limit ring 18, the limit ring 18 is arranged in the outer shell 11 and is located on the outer side of the friction ring 14, and a movable gap is formed between the limit ring 18 and the friction ring 14; a rotating disk 19, the rotating disk 19 is arranged on the transmission shaft 12 and rotates synchronously with the transmission shaft 12, and a stop rod 20 is arranged on the edge of the rotating disk 19;

[0083] The end of the baffle is movably arranged in the movable gap between the limiting ring 18 and the friction ring 14 , and the baffle can rotate along with the rotation of the rotating disk 19 .

[0084] The outer shell 11 is a conventional hollow cylindrical shell, the transmission shaft 12 extends along the axial direction of the outer shell 11, and there may be two extension rods 13, which are symmetrically distributed on both sides of the transmission shaft 12 along the radial direction of the transmission shaft 12. The outer end of the extension rod 13 is provided with a friction block 15 mounting portion, and a movable groove is opened on the friction block 15 mounting portion. The friction block 15 is movably installed in the movable groove. The friction block 15 is connected to the movable groove by a spring. The friction ring 14 is fixedly connected to the outer shell 11, and the friction ring 14 is coaxially arranged with the transmission shaft 12.

[0085] In this embodiment, the carriage 3 moves along the load-bearing slide rail 2 under the drive of the moving wheel 5. When the moving wheel 5 slips during operation, the friction between the moving wheel 5 and the load-bearing slide rail 2 is instantly reduced, resulting in a reduction in the traction of the moving wheel 5. The rotation speed of the moving wheel 5 will increase sharply. The higher the rotation speed of the moving wheel 5, the lower the traction generated by the moving wheel 5. The moving wheel 5 cannot eliminate the slip by itself under the high rotation speed state. At this time, driven by the transmission shaft 12, the extension rod 13 rotates rapidly with the rotation of the moving wheel 5, thereby throwing out the friction block 15 and making the friction block 15 contact with the friction surface of the friction ring 14, thereby reducing the rotation speed of the moving wheel 5 through friction, and at the same time, the ball 17 on the outer side of the friction ring 14 is also thrown out. The limit ring 18 also rotates rapidly with the rotation of the transmission shaft 12 and drives the blocking rod 20 to continuously hit the ball 17 that is also thrown out. After being hit, the ball 17 returns to the ball 17 groove 16 and is thrown out again with the rotation of the transmission shaft 12. The higher the speed, the greater the friction between the friction block 15 and the friction surface, and the greater the force required for the blocking rod 20 to squeeze the ball 17 back into the ball 17 groove 16, thereby effectively reducing the speed of the moving wheel 5 after slipping. After the speed of the moving wheel 5 is reduced, the traction force generated by the moving wheel 5 is gradually restored, thereby eliminating the slippage to continue to drive the slide 3 to move. At the same time, it can also prevent the moving wheel 5 from rotating at a high speed when slipping, causing excessive wear between the moving wheel 5 and the load-bearing slide rail 2.

[0086] Embodiment 3:

[0087] This embodiment provides a gantry crane for use on a construction site. In addition to the technical solutions of the above-mentioned embodiments, it also has the following technical features, including: a slide rail cleaning mechanism 21, which is arranged on the inner side of the slide 3 and is used to clean the surface of the load-bearing slide rail 2.

[0088] The rail cleaning mechanism 21 further includes: an exhaust fan 22, which is arranged on the outer surface of the slide 3; an air outlet 23, which is arranged on the inner side of the slide 3 and can evenly blow air toward the surface of the load-bearing rail 2;

[0089] The exhaust fan 22 is connected to the air outlet 23 via a connecting air duct.

[0090] The air outlet head 23 further includes: an air outlet shell 230, the air outlet shell 230 is composed of a first air outlet section 2301, a second air outlet section 2302 and a third air outlet section 2303, the first air outlet section 2301 is provided with an air inlet, and the third air outlet section 2303 is provided with an air outlet; a guide plate 231, the guide plate 231 is arranged in the air outlet shell 230, the guide plates 231 have at least two pieces and are symmetrically distributed along the width direction of the air outlet shell 230, and the spacing between the two guide plates 231 increases from the air inlet to the air outlet direction; a plurality of curtain plates 232, the plurality of curtain plates 232 are arranged at the air outlet of the third air outlet section 2303, the curtain plates 232 extend along the width direction of the air outlet shell 230, and the plurality of curtain plates 232 are evenly spaced and distributed along the height direction of the air outlet shell 230;

[0091] Among them, the internal height of the first air outlet section 2301 decreases from the air inlet to the air outlet, the internal height of the second air outlet section 2302 increases from the air inlet to the air outlet, and the internal height of the third air outlet section 2303 decreases from the air inlet to the air outlet, and a gap is set between the guide plate 231 and the air inlet.

[0092] The slide rail cleaning mechanisms 21 have two and are respectively arranged on both sides of the two moving wheels 5 .

[0093] In this embodiment, when the moving wheel 5 drives the slide 3 to move along the load-bearing beam 1, the exhaust fan 22 runs and drives the air flow, and the flowing air flow moves along the connecting air duct to the air outlet 23. After the air flow enters the air outlet shell 230, the internal height of the first air outlet section 2301 decreases from the air inlet to the air outlet, the internal height of the second air outlet section 2302 increases from the air inlet to the air outlet, and the internal height of the third air outlet section 2303 decreases from the air inlet to the air outlet. Therefore, the air flow can be effectively and evenly released and finally accelerated to be ejected when moving along the first air outlet section 2301, the second air outlet section 2302 and the third air outlet section 2303. At the same time, since the space of the second air outlet section 2302 is located in the middle and gradually becomes larger, the space of the second air outlet section 2302 Segment 2302 can effectively distribute the airflow evenly in cooperation with the guide plate 231. Finally, the airflow is ejected through the air outlet of the third air outlet to the surface of the load-bearing slide rail 2 to blow and clean the impurities or moisture attached to the surface of the load-bearing slide rail 2. At the same time, under the action of several curtain panels 232, several layers of wind curtains can be formed when the airflow is ejected from the air outlet. As the slide 3 moves, the outermost layer of the wind curtain airflow first blows away the impurities and moisture on the load-bearing slide rail 2, and then the inner layer of the wind curtain airflow blows away the impurities and moisture on the load-bearing slide rail 2 in turn, thereby realizing multiple blows at one air outlet, effectively improving the blowing and cleaning effect of the impurities and moisture attached to the surface of the load-bearing slide rail 2, and preventing the phenomenon that impurities and moisture are still attached to the surface of the load-bearing slide rail 2 after one blow.

[0094] Embodiment 4:

[0095] This embodiment provides a gantry crane for a construction site. In addition to the technical solutions of the above embodiments, it also has the following technical features. The slide rail cleaning mechanism 21 also includes: a rotating shaft 24, which is rotatably arranged on the inner side of the slide 3 through a fixed block 32; a cam 25, which is arranged on the rotating shaft 24 and can rotate with the rotating shaft 24; a reciprocating rod 26, which is movably arranged below the cam 25 and can reciprocate up and down under the action of the cam 25; a water suction roller 27, which is rotatably arranged at the bottom end of the reciprocating rod 26;

[0096] The cam 25 and the reciprocating rod 26 each have at least two reciprocating rods 26 that move up and down alternately. One end of the rotating shaft 24 is disposed in the connecting air duct and can be driven to rotate under the action of the airflow.

[0097] A transmission fan 28 is installed in the connecting air duct, the bottom end of the shaft of the transmission fan 28 extends downward and is installed with a driving bevel gear 29, one end of the rotating shaft 24 extends into the connecting air duct and is installed with a driven bevel gear 30, the driving bevel gear 29 and the driven bevel gear 30 are meshed with each other, and the other end of the rotating shaft 24 can also be connected to an auxiliary starting motor, connecting arms 31 are installed on both sides of the reciprocating rod 26, the top end of the connecting arm 31 is connected to the side wall of the fixed block 32 through an elastic member, thereby cooperating with the cam 25 to realize the up and down reciprocating movement of the reciprocating rod 26.

[0098] In this embodiment, during the operation of the exhaust fan 22, the airflow drives the transmission fan 28 to rotate while flowing along the connecting air duct, thereby driving the driven bevel gear 30 to rotate through the active bevel gear 29, and the rotating shaft 24 rotates with the rotation of the driven bevel gear 30. At the same time, it can be started by attaching the rotating shaft 24 to the auxiliary starting motor. During the rotation of the rotating shaft 24, the two cams 25 are driven to rotate. During the rotation of the cam 25, the reciprocating rod 26 is driven to move up and down so that the two water-absorbing rollers 27 are alternately in contact with the surface of the load-bearing slide rail 2. The water-absorbing roller 27 can further clean the moisture attached to the surface of the load-bearing slide rail 2. By having the two absorption rollers alternately in contact with the surface of the load-bearing slide rail 2, the continuity of cleaning can be ensured and the effective working time of the water-absorbing roller 27 can be increased.

[0099] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A gantry crane for use at a construction site, comprising: A load-bearing beam (1), wherein support legs (100) are provided on both sides of the load-bearing beam (1); Load-bearing slide rails (2), the load-bearing slide rails (2) being arranged on both sides of the load-bearing beam (1); A slide frame (3), wherein the slide frame (3) is slidably arranged on the load-bearing beam (1); A lifting structure (4), wherein the lifting structure (4) is arranged at the bottom of the slide (3); A moving wheel (5), the moving wheel (5) being rotatably arranged on the inner side of the slide (3), and the moving wheel (5) being rotatably driven by a driving unit (6); It is characterized by further comprising: A synchronous rack (7), wherein the synchronous rack (7) is arranged on the top of the load-bearing slide rail (2); A synchronous gear set (8), wherein the synchronous gear set (8) is rotatably arranged on a side wall of the load-bearing slide rail (2); A telescopic damping rod (9), wherein the telescopic damping rod (9) is arranged between the synchronous gear set (8) and the moving wheel (5); The synchronous gear set (8) is meshed with the synchronous rack (7), one end of the telescopic damping rod (9) is movably connected to the synchronous gear set (8), and the other end is movably connected to the moving wheel (5), and the telescopic damping rod (9) does not perform telescopic movement when the synchronous gear set (8) and the moving wheel (5) rotate simultaneously; Also includes: A moving wheel (5) speed reduction mechanism, the moving wheel (5) speed reduction mechanism being arranged on the outside of the slide (3), and the moving wheel (5) speed reduction mechanism being drivingly connected to the wheel axle of the moving wheel (5); Wherein, the speed reduction mechanism of the moving wheel (5) is capable of reducing the rotation speed of the moving wheel (5) when the moving wheel (5) slips; The moving wheel (5) speed reduction mechanism comprises: An outer shell (11), the outer shell (11) being arranged on an outer surface of the slide (3); A transmission shaft (12), the transmission shaft (12) being in transmission connection with the wheel axle of the moving wheel (5), and an extension rod (13) extending radially along the transmission shaft (12) being provided at the outer end of the transmission shaft (12); A friction ring (14), wherein the friction ring (14) is arranged in the outer shell (11), and the inner ring surface of the friction ring (14) is a friction surface; A friction block (15), wherein the friction block (15) is movably arranged at the top end of the extension rod (13), and the friction block (15) can contact the friction surface of the friction ring (14) as the rotation speed of the transmission shaft (12) increases; The moving wheel (5) speed reduction mechanism further comprises: A ball groove (16), the ball groove (16) being arranged on the outer annular surface of the friction zone, and a ball (17) being arranged in the ball groove (16); A limiting ring (18), the limiting ring (18) being arranged in the outer shell (11) and located outside the friction ring (14), with a movable gap being formed between the limiting ring (18) and the friction ring (14); A rotating disk (19), the rotating disk (19) being arranged on the transmission shaft (12) and rotating synchronously with the transmission shaft (12), and a stop rod (20) being arranged on the edge of the rotating disk (19); The end of the baffle rod (20) is movably arranged in a movable gap between the limiting ring (18) and the friction ring (14), and the baffle rod (20) can rotate along with the rotation of the rotating disk (19).

2. A gantry crane for construction site according to claim 1, characterized in that: Also includes: A slide rail cleaning mechanism (21), wherein the slide rail cleaning mechanism (21) is arranged on the inner side of the slide frame (3) and is used for cleaning the surface of the load-bearing slide rail (2).

3. A gantry crane for construction site according to claim 2, characterized in that: The slide rail cleaning mechanism (21) further comprises: an exhaust fan (22), wherein the exhaust fan (22) is arranged on an outer surface of the slide frame (3); An air outlet (23), wherein the air outlet (23) is arranged on the inner side of the slide frame (3) and can evenly blow air toward the surface of the load-bearing slide rail (2); The exhaust fan (22) is connected to the air outlet (23) via a connecting air duct.

4. A gantry crane for construction sites according to claim 3, characterized in that: The shower head (23) further comprises: An air outlet shell (230), the air outlet shell (230) consisting of a first air outlet section (2301), a second air outlet section (2302) and a third air outlet section (2303), the first air outlet section (2301) being provided with an air inlet, and the third air outlet section (2303) being provided with an air outlet; A guide plate (231), the guide plate (231) being arranged in the air outlet housing (230), the guide plates (231) comprising at least two and symmetrically distributed along the width direction of the air outlet housing (230), and the spacing between the two guide plates (231) increasing in sequence from the air inlet to the air outlet; A plurality of curtain panels (232), wherein the plurality of curtain panels (232) are arranged at the air outlet of the third air outlet section (2303), the curtain panels (232) extending along the width direction of the air outlet shell (230), and the plurality of curtain panels (232) are evenly spaced and distributed along the height direction of the air outlet shell (230); The internal height of the first air outlet section (2301) decreases from the air inlet to the air outlet, the internal height of the second air outlet section (2302) increases from the air inlet to the air outlet, the internal height of the third air outlet section (2303) decreases from the air inlet to the air outlet, and a gap is provided between the guide plate (231) and the air inlet.

5. A gantry crane for construction sites according to claim 4, characterized in that: The slide rail cleaning mechanism (21) further comprises: A rotating shaft (24), the rotating shaft (24) being rotatably disposed on the inner side of the slide (3) via a fixed block (32); A cam (25), wherein the cam (25) is disposed on the rotating shaft (24) and can rotate along with the rotating shaft (24); A reciprocating rod (26), the reciprocating rod (26) being movably disposed below the cam (25) and being capable of reciprocating up and down under the action of the cam (25); A water-absorbing roller (27), wherein the water-absorbing roller (27) is rotatably arranged at the bottom end of the reciprocating rod (26); The cam (25) and the reciprocating rod (26) each have at least two reciprocating rods (26) that move up and down alternately, and one end of the rotating shaft (24) is arranged in the connecting air duct and can be driven to rotate under the action of the airflow.

6. An operating method applicable to the gantry crane for construction site according to claim 5, characterized in that: The following steps are involved: S1 Slip brake during shutdown. When the gantry crane is in use, the slide (3) moves along the load-bearing slide rail (2) driven by the moving wheel (5). At the same time, the synchronous gear set (8) cooperates with the synchronous rack (7) to rotate synchronously with the moving wheel (5). The telescopic damping rod (9) does not perform telescopic movement. After the movement is completed, the moving wheel (5) stops rotating. When the slide (3) causes the moving wheel (5) to slip due to inertia, the synchronous rotation between the synchronous gear set (8) and the moving wheel (5) is broken. At this time, the telescopic damping rod (9) begins to telescope, thereby consuming kinetic energy in the process and preventing the slide (3) from continuing to move. During the operation of S2, the slide (3) is driven by the moving wheel (5) to move along the load-bearing slide rail (2). When the moving wheel (5) slips, the friction between the moving wheel (5) and the load-bearing slide rail (2) is instantly reduced, resulting in a reduction in the traction force of the moving wheel (5). The rotation speed of the moving wheel (5) increases sharply. At this time, driven by the transmission shaft (12), the extension rod (13) rotates rapidly to throw out the friction block (15) and make the friction block (15) contact the friction surface of the friction ring (14). The rotation speed of the moving wheel (5) is reduced by friction. At the same time, the limit ring (18) is also rotating and drives the stop rod (20) to continuously hit the ball (17) that is also thrown out. After the rotation speed of the moving wheel (5) is reduced, the traction force generated by the moving wheel (5) is gradually restored to continue to drive the slide (3) to move; S3 cleaning of the load-bearing slide rail (2). When the moving wheel (5) drives the slide frame (3) to move, the exhaust fan (22) operates to generate airflow and transmits the airflow to the air outlet (23) through the connecting air duct. The airflow is evenly distributed in the air outlet shell (230) under the action of the guide plate (231). At the same time, under the action of the first air outlet section (2301), the second air outlet section (2302) and the third air outlet section (2303), the airflow is stabilized and accelerated to be discharged from the air outlet. When the airflow passes through the plurality of curtain panels (232), it is divided into a plurality of layers of wind curtains. Finally, the airflow is sprayed onto the surface of the load-bearing slide rail (2) to blow away impurities or moisture on the surface of the load-bearing slide rail (2), and the water absorption roller (27) can further absorb moisture on the load-bearing slide rail (2) on rainy days.

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