Movable gantry crane with safety guard

Abstract

The present application relates to gantry crane field, especially a kind of mobile gantry crane with safety guard, comprising: mobile base, still including fixedly installed support unit on mobile base, and fixedly installed drive unit on support unit;Support unit, including fixedly installed support assembly on mobile base, slidingly installed protection assembly on support assembly.The present application is positioned by mobile base, relies on support assembly and drive assembly to complete object hoisting operation, protection assembly and linkage assembly move up and down with hoisting process, realize linkage operation;When hoisting falls accidentally, the rapid descent of drive assembly will drive protection assembly and linkage assembly to move synchronously at high speed, promote the instantaneous engagement of both and bite in the outer wall of support assembly, protection assembly, protection piece and drive assembly are forced to be positioned and fixed, effectively prevent the expansion of falling accident, realize the dynamic synchronous protection of hoisting operation, without relying on simple limit switch or artificial protection.

Description

Technical Field

[0001] This invention relates to the field of gantry crane technology, and more particularly to a mobile gantry crane with a safety protection device. Background Technology

[0002] With the rapid development of the industrial, construction and logistics sectors, mobile gantry cranes, due to their large span, flexibility and adaptability to various sites, are widely used for heavy lifting and loading / unloading operations and are key lifting equipment. As the intensity of operations and the complexity of working conditions increase, the requirements for their stability, anti-tipping and safety protection are higher. Safety protection devices have become a key configuration to ensure operational safety and prevent accidents.

[0003] Existing mobile gantry cranes lack comprehensive integrated safety protection devices, relying mostly on simple limit switches or manual protection. The protection functions are limited and the integration is low. At the same time, during operation, they are prone to overturning, deviation, and derailment risks due to uneven load or excessive speed. Furthermore, they lack anti-collision structures, have poor adaptability to working conditions, and often experience problems such as protection failure and inconvenient maintenance. Summary of the Invention

[0004] In view of the problems existing in the current mobile gantry crane with safety protection device, the present invention is proposed.

[0005] Therefore, the present invention provides a mobile gantry crane with a safety protection device, the purpose of which is to solve the problems of existing mobile gantry cranes having simple protection, single function, easy overturning and deviation, lack of anti-collision structure, poor adaptability, inconvenient maintenance, and prominent safety hazards.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a mobile gantry crane with a safety protection device, including a mobile base, a support unit fixedly installed on the mobile base, and a drive unit fixedly installed on the support unit; the support unit includes a support component fixedly installed on the mobile base, a protection component slidably installed on the support component, and a linkage component rotatably installed on the protection component; the drive unit includes a drive component fixedly installed on the support component, and the drive component is fixedly connected to the protection component.

[0007] As a preferred embodiment of the mobile gantry crane with safety protection device described in this invention, the support assembly includes a main support frame fixedly installed on a mobile base, a connecting plate fixedly installed on the main support frame, a hydraulic rod fixedly installed on the connecting plate, and a secondary support frame fixedly installed at the output end of the hydraulic rod, wherein the secondary support frame is slidably connected to the main support frame.

[0008] As a preferred embodiment of the mobile gantry crane with safety protection device described in this invention, the inner wall of the main support frame is provided with a limit groove one, the inner wall of the secondary support frame is provided with a limit groove two, an auxiliary frame is fixedly installed on the connecting plate, and the other end of the auxiliary frame is fixedly connected to the mobile base.

[0009] As a preferred embodiment of the mobile gantry crane with safety protection device described in this invention, the protection component includes a movable wheel slidably mounted on the auxiliary support frame, a limiting plate rotatably mounted on the movable wheel, a connecting plate fixedly mounted on the limiting plate, and a fixing plate fixedly mounted on the connecting plate, wherein the fixing plate is fixedly connected to the drive component.

[0010] As a preferred embodiment of the mobile gantry crane with safety protection device described in this invention, a rotating chuck is rotatably installed on the inner wall of the connecting plate, and the rotating chuck is slidably connected to the first limiting groove and the second limiting groove respectively.

[0011] As a preferred embodiment of the mobile gantry crane with safety protection device described in this invention, a fixed shaft is fixedly installed on the connecting plate, a sliding groove is provided on the inner wall of the fixed shaft, a sliding sleeve is slidably installed on the inner wall of the sliding groove, a fastener is fixedly installed on the sliding sleeve, and the fastener is slidably connected to the limiting groove and the limiting groove respectively.

[0012] As a preferred embodiment of the mobile gantry crane with safety protection device described in this invention, the linkage component includes a connecting shaft fixedly mounted on a connecting plate, a coil spring fixedly mounted on the connecting shaft, and a rotating rod fixedly mounted on the coil spring, wherein the rotating rod is rotatably connected to the connecting plate.

[0013] As a preferred embodiment of the mobile gantry crane with safety protection device described in this invention, a conical component is rotatably mounted on the rotating rod, a rotating slide rod is slidably mounted on the inner wall of the conical component, and the rotating slide rod passes through the conical component and is fixedly connected to the rotating rod. A connecting block is fixedly mounted on the conical component, a connecting spring is fixedly mounted on the connecting block, and a protective component is fixedly mounted on the other end of the connecting spring.

[0014] As a preferred embodiment of the mobile gantry crane with safety protection device described in this invention, the protective component includes a linkage rod rotatably mounted on a connecting plate, a second connecting block fixedly mounted on the linkage rod, a rotating rod fixedly mounted on the other end of the second connecting block, a connecting sleeve fixedly mounted on the rotating rod, a damping spring fixedly mounted on the connecting sleeve, and a second buckle fixedly mounted on the damping spring, wherein the second buckle is slidably connected to the first limiting groove and the second limiting groove respectively.

[0015] As a preferred embodiment of the mobile gantry crane with safety protection device described in this invention, the drive assembly includes a support steel fixedly installed on a secondary support frame, a fixing member fixedly installed on the support steel, an elastic rope fixedly installed on the fixing member, a second fixed shaft fixedly installed on the other end of the elastic rope, a mobile steel fixedly installed on the second fixed shaft, and a lifting member slidably installed on the mobile steel, wherein the mobile steel is fixedly connected to a fixed plate.

[0016] The beneficial effects of this invention are as follows: After positioning by the movable base, the invention relies on the support component and the drive component to complete the object hoisting operation in coordination. The protection component and the linkage component move up and down synchronously during the hoisting process to achieve linkage operation. When an accidental fall occurs during hoisting, the rapid descent of the drive component will cause the protection component and the linkage component to accelerate synchronously, causing them to instantly engage and lock onto the outer wall of the support component. This forcibly limits and fixes the protection component, protective parts, and drive component, effectively preventing the fall accident from escalating. It achieves dynamic synchronous protection for hoisting operations without relying on simple limit switches or manual protection. The protection function has a high degree of integration, rapid response, and can effectively avoid the risks of overturning, deviation, and derailment caused by load imbalance and excessively fast movement. It makes up for the shortcomings of traditional equipment in lacking anti-collision structure and poor adaptability to working conditions, eliminates the problem of protection failure, simplifies the maintenance process, and improves the safety, stability, and adaptability of mobile gantry crane operations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the mobile gantry crane with safety protection device of the present invention.

[0019] Figure 2 This is a schematic diagram of the support unit structure of the mobile gantry crane with safety protection device of the present invention.

[0020] Figure 3 This is a side view of the support unit structure of the mobile gantry crane with safety protection device of the present invention.

[0021] Figure 4 This is a front structural view of the support assembly of the mobile gantry crane with safety protection device of the present invention.

[0022] Figure 5 This is a schematic diagram of the protective component structure of the mobile gantry crane with safety protection device of the present invention.

[0023] Figure 6This is an exploded structural diagram of the protective components of the mobile gantry crane with safety protection device of the present invention.

[0024] Figure 7 This is a cross-sectional structural diagram of the protective components of the mobile gantry crane with safety protection device of the present invention.

[0025] Figure 8 This is a schematic diagram of the limiting component structure of the mobile gantry crane with safety protection device of the present invention.

[0026] Figure 9 This is a cross-sectional structural diagram of the limiting component of the mobile gantry crane with safety protection device of the present invention.

[0027] Figure 10 This is a schematic diagram of the lifting unit component of the mobile gantry crane with safety protection device of the present invention.

[0028] Explanation of reference numerals in the attached drawings: 1. Movable base; 2. Support unit; 21. Support assembly; 211. Main support frame; 212. Limiting groove one; 213. Connecting plate; 214. Hydraulic rod; 215. Secondary support frame; 216. Limiting groove two; 217. Auxiliary frame; 22. Protective assembly; 221. Moving wheel; 222. Limiting plate; 223. Connecting plate; 224. Fixing plate; 225. Rotating cam; 226. Fixed shaft one; 227. Sliding groove; 228. Sliding sleeve; 229. Buckle one; 23. Linkage assembly; 231. Connecting shaft; 232. Coil spring; 233. Rotating rod; 234. Conical part; 235. Rotating slide rod; 236. Limiting post; 237. Connecting block one; 238. Connecting spring; 239. Protective part; 2391. Linkage rod; 2392. Connecting block two; 2393. Rotating rod; 2394. Connecting sleeve; 2395. Damping spring; 2396. Buckle two; 3. Drive unit; 31. Drive assembly; 311. Support steel; 312. Fixing part; 313. Elastic rope; 314. Fixed shaft two; 315. Moving steel; 316. Lifting part. Detailed Implementation

[0029] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0030] Example 1, referring to Figures 1-2 The first embodiment of the present invention provides a mobile gantry crane with a safety protection device. The device includes: a mobile base 1, a support unit 2 fixedly installed on the mobile base 1, and a drive unit 3 fixedly installed on the support unit 2.

[0031] The support unit 2 includes a support component 21 fixedly installed on the movable base 1 for overall movement support, a protection component 22 slidably installed on the support component 21, and a linkage component 23 rotatably installed on the protection component 22 to cooperate with the protection component 22 to ensure the operational stability of the support component 21 and the drive component 31. Furthermore, the drive unit 3 includes a drive component 31 fixedly installed on the support component 21, and the drive component 31 is fixedly connected to the protection component 22 for cargo hoisting operations.

[0032] In use, after moving the mobile base 1 to the designated position, the hoisting operation is initiated through the cooperation of the support component 21 and the drive component 31. At the same time, the protection component 22 and the linkage component 23 move up and down synchronously during the hoisting process. If an accident occurs during hoisting, such as a sudden fall when the drive component 31 is lifting the goods, the rapid fall of the drive component 31 will cause the protection component 22 and the linkage component 23 to fall synchronously at high speed, causing them to suddenly accelerate on the support component 21 and then lock into place on the outer wall of the support component 21. This forcibly limits and fixes the protection component 22, the linkage component 23, and the drive component 31, thereby achieving a protective effect and effectively preventing the fall accident from escalating. This invention can achieve dynamic synchronous protection during hoisting operations without relying on simple limit switches or manual protection. It has the characteristics of high integration of protective functions and rapid response, and can effectively avoid the risks of overturning, deviation, and derailment caused by load imbalance and excessively fast movement. It makes up for the shortcomings of traditional equipment in lacking anti-collision structures and poor adaptability to working conditions, and eliminates the problem of protection failure.

[0033] Example 2, refer to Figures 1-4 This is the second embodiment of the present invention, which differs from the first embodiment in that: the support assembly 21 includes a main support frame 211 fixedly mounted on the movable base 1, a connecting plate 213 fixedly mounted on the main support frame 211, a hydraulic rod 214 fixedly mounted on the connecting plate 213, and a secondary support frame 215 fixedly mounted on the output end of the hydraulic rod 214; wherein the main support frame 211 is used to support the overall structure, the connecting plate 213 is used to connect the auxiliary frame 217 and the hydraulic rod 214, the hydraulic rod 214 is used to drive the secondary support frame 215 to move inside the main support frame 211, and the secondary support frame 215 is slidably connected to the main support frame 211 to achieve height extension.

[0034] Compared to Embodiment 1, this embodiment further provides a limiting groove 212 on the inner wall of the main support frame 211 and a limiting groove 216 on the inner wall of the secondary support frame 215; an auxiliary frame 217 is fixedly installed on the connecting plate 213, and its other end is fixedly connected to the movable base 1 to cooperate with the protection component 22 to achieve synchronous movement limiting.

[0035] The drive assembly 31 includes a support steel 311 fixedly mounted on the secondary support frame 215, a fixing member 312 fixedly mounted on the support steel 311, an elastic rope 313 fixedly mounted on the fixing member 312, a second fixed shaft 314 fixedly mounted on the other end of the elastic rope 313, a movable steel 315 fixedly mounted on the second fixed shaft 314, and a lifting member 316 slidably mounted on the movable steel 315. The support steel 311 is used for overall fixation of the top structure, the fixing member 312 is used to connect the elastic rope 313, the elastic rope 313 is used to connect the second fixed shaft 314, the second fixed shaft 314 is used to connect the movable steel 315, the movable steel 315 is used to drive the lifting action, and the movable steel 315 is fixedly connected to the fixed plate 224 for lifting goods.

[0036] In use, first, the mobile base 1 is moved smoothly to the designated working position and fixed to ensure the stability of the equipment foundation. Then, the goods to be lifted are precisely engaged and fixed by the lifting component 316. After reliable binding is completed, the lifting operation is started. During the lifting process, the mobile steel 315 moves smoothly and synchronously upward along the main support frame 211 under the elastic traction of the elastic rope 313 and the guiding and limiting cooperation of the fixed shaft 314. The protective component 22, which is fixedly connected to the mobile steel 315, moves synchronously upward along the outer wall of the main support frame 211. It moves in conjunction with the lifting action throughout the process without any additional operation steps, which can efficiently complete the lifting operation of the goods. At the same time, starting the hydraulic rod 214 can push the auxiliary support frame 215 to extend smoothly upward from the inside of the main support frame 211, flexibly adjusting the overall lifting height to adapt to different working scenarios and the lifting requirements of the goods, greatly improving the adaptability of the equipment. The auxiliary frame 217 works in conjunction with the mobile base 1 to form a multi-point support structure from the bottom, effectively dispersing the lifting load, suppressing the shaking and deviation of the machine body, enhancing the overall stability of the lifting process, and avoiding the risk of overturning or deviation. In addition, throughout the lifting process, the elastic rope 313, together with the fixing component 312, provides elastic buffering and stroke limit for the up and down movement of the mobile steel 315, which can effectively offset the impact load at the moment of lifting of the goods, reduce the vibration amplitude, prevent hard contact collisions that may cause wear on equipment parts or shaking and deviation of the goods, ensure a smooth and stable lifting process, accurate positioning, reduce operational safety hazards, and improve lifting efficiency and operational safety.

[0037] The remaining structure is the same as that in Example 1.

[0038] Example 3, referring to Figures 1-10This is the third embodiment of the present invention, which differs from the second embodiment in that: the protective component 22 includes: a movable wheel 221 slidably mounted on the secondary support frame 215 for moving up and down along the main support frame 211 and the secondary support frame 215; a limiting plate 222 rotatably mounted on the movable wheel 221 for cooperating with the movable wheel 221 for moving; a connecting plate 223 fixedly mounted on the limiting plate 222 for connecting a fixing plate 224; and a fixing plate 224 fixedly mounted on the connecting plate 223, wherein the fixing plate 224 is fixedly connected to the drive component 31 for connecting the movable steel 315.

[0039] Compared to Embodiment 2, this embodiment further includes a rotating chuck 225 rotatably mounted on the inner wall of the connecting plate 223. The rotating chuck 225 is slidably connected to the first limiting groove 212 and the second limiting groove 216 respectively. The rotating chuck 225 engages with the first limiting groove 212 and the second limiting groove 216 during its up-and-down movement to achieve cooperation.

[0040] Furthermore, a fixed shaft 226 for connecting and sliding the sliding sleeve 228 is fixedly installed on the connecting plate 223. The inner wall of the fixed shaft 226 is provided with a sliding groove 227 for limiting the sliding of the sliding sleeve 228. The inner wall of the sliding groove 227 is slidably installed with the sliding sleeve 228 for connecting the fastener 229. The fastener 229 is fixedly installed on the sliding sleeve 228, and the fastener 229 is slidably connected to the limiting groove 212 and the limiting groove 216 respectively.

[0041] Furthermore, the linkage assembly 23 includes: a connecting shaft 231 fixedly mounted on the connecting plate 223 for connecting the coil spring 232 and the connecting plate 223; a coil spring 232 fixedly mounted on the connecting shaft 231 for connecting the rotating rod 233; and a rotating rod 233 fixedly mounted on the coil spring 232, wherein the rotating rod 233 is rotatably connected to the connecting plate 223 for cooperating with the tapered member 234 and the rotating slide rod 235 to achieve rotational reset.

[0042] Furthermore, a tapered member 234 is rotatably mounted on the rotating rod 233 to cooperate with the rotation of the rotating slide rod 235. The rotating slide rod 235 is slidably mounted on the inner wall of the tapered member 234, and the rotating slide rod 235 passes through the tapered member 234 and is fixedly connected to the rotating rod 233 to cooperate with the rotation and sliding of the rotating chuck 225. A connecting block 237 for connecting the spring 238 is fixedly mounted on the tapered member 234. A connecting spring 238 for connecting the protective member 239 is fixedly mounted on the connecting block 237. The other end of the connecting spring 238 is fixedly mounted with the protective member 239 for limiting engagement.

[0043] Furthermore, the protective component 239 includes: a linkage rod 2391 rotatably mounted on the connecting plate 223 for rotation in conjunction with the pull of the connecting spring 238; a connecting block 2392 fixedly mounted on the linkage rod 2391 for connecting the rotating rod 2393; a rotating rod 2393 fixedly mounted on the other end of the connecting block 2392 for connecting the sleeve 2394; a connecting sleeve 2394 fixedly mounted on the rotating rod 2393 for connecting the damping spring 2395; a damping spring 2395 fixedly mounted on the connecting sleeve 2394; and a second buckle 2396 fixedly mounted on the damping spring 2395, wherein the second buckle 2396 is slidably connected to the first limiting groove 212 and the second limiting groove 216 respectively. Through the cooperation of the damping spring 2395 and the second buckle 2396, stable protection is achieved for the hoisting process of the drive assembly 31.

[0044] During use, the normal hoisting process of the goods is first initiated through the cooperation of the support component 21 and the drive component 31. When the drive component 31 is hoisting, the fixed plate 224 is connected to the drive component 31, and the fixed plate 224 will simultaneously drive the connecting plate 223, the limiting plate 222 and the moving wheel 221 to slide and limit the movement on the inner walls of the main support frame 211 and the secondary support frame 215. At the same time, the rotating chuck 225 continues to slide with the rotating slide rod 235, causing the rotating slide rod 235 to slide into the conical part 234. After the rotating chuck 225 has slid through, under the action of the coil spring 232 inside the connecting shaft 231, the rotating chuck 225 slides back into the conical part 234 and resumes normal sliding cooperation with the rotating chuck 225, thereby realizing the hoisting protection function.

[0045] If a fall occurs during hoisting, and the drive assembly 31 and the cargo suddenly fall, the fixed plate 224 will simultaneously drive the connecting plate 223 and the moving wheel 221 to slide rapidly down the outer wall of the main support frame 211. At the same time, the rotating chuck 225 inside the connecting plate 223 will also rotate at high speed. During the high-speed rotation of the rotating chuck 225, it will directly squeeze the rotating slide rod 235 into the conical part 234. Because the rotating chuck 225 rotates at an extremely high speed, the rotating slide rod 235 has not yet returned to its original position, and the rotating chuck 224 will... 5 then slides over again, directly squeezing the conical part 234, forcing the conical part 234 to flip. When the conical part 234 flips, the connecting block 237 and the connecting spring 238 at its bottom are pulled upward, driving the linkage rod 2391 to rotate. At the same time, the connecting block 2392 drives the rotating rod 2393 to rotate, causing the connecting sleeve 2394 to change its angle, and finally allowing the damping spring 2395 and the buckle 2396 to directly engage in the limiting groove 212 on the inner wall of the main support frame 211, forming a blocking engagement.

[0046] Meanwhile, the sliding sleeve 228 inside the fixed shaft 226 rotates in place due to inertia, and under the limiting action of the sliding groove 227, the buckle 229 on the sliding sleeve 228 adjusts its angle synchronously, and cooperates with the protective component 239 to engage inside the connecting plate 213, thereby forming a state of pulling from above and engaging from below, forcibly fixing the drive component 31, preventing it from falling further and providing protection, effectively preventing the fall accident from escalating, and realizing dynamic synchronous protection for hoisting operations. It does not need to rely on simple limit switches or manual protection, and has the characteristics of high integration of protective functions and rapid response. It can effectively avoid the risks of overturning, deviation, and derailment caused by load imbalance and excessively fast movement, make up for the shortcomings of traditional equipment in lack of anti-collision structure and poor adaptability to working conditions, and eliminate the problem of protection failure.

[0047] The remaining structure is the same as that in Example 2.

[0048] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A mobile gantry crane with a safety protection device, characterized in that: It includes a movable base (1), a support unit (2) fixedly mounted on the movable base (1), and a drive unit (3) fixedly mounted on the support unit (2). The support unit (2) includes a support component (21) fixedly installed on the movable base (1), a protective component (22) slidably installed on the support component (21), and a linkage component (23) rotatably installed on the protective component (22). The drive unit (3) includes a drive component (31) fixedly mounted on the support component (21), and the drive component (31) is fixedly connected to the protection component (22).

2. The mobile gantry crane with safety protection device according to claim 1, characterized in that: The support assembly (21) includes a main support frame (211) fixedly mounted on the movable base (1), a connecting plate (213) fixedly mounted on the main support frame (211), a hydraulic rod (214) fixedly mounted on the connecting plate (213), and a secondary support frame (215) fixedly mounted on the output end of the hydraulic rod (214), and the secondary support frame (215) is slidably connected to the main support frame (211).

3. The mobile gantry crane with safety protection device according to claim 2, characterized in that: The inner wall of the main support frame (211) is provided with a limiting groove 1 (212), the inner wall of the secondary support frame (215) is provided with a limiting groove 2 (216), an auxiliary frame (217) is fixedly installed on the connecting plate (213), and the other end of the auxiliary frame (217) is fixedly connected to the movable base (1).

4. The mobile gantry crane with safety protection device according to claim 3, characterized in that: The protective component (22) includes a movable wheel (221) slidably mounted on the sub-support frame (215), a limiting plate (222) rotatably mounted on the movable wheel (221), a connecting plate (223) fixedly mounted on the limiting plate (222), and a fixing plate (224) fixedly mounted on the connecting plate (223), and the fixing plate (224) is fixedly connected to the drive component (31).

5. The mobile gantry crane with safety protection device according to claim 4, characterized in that: The inner wall of the connecting plate (223) is rotatably mounted with a rotating chuck (225), and the rotating chuck (225) is slidably connected to the first limiting groove (212) and the second limiting groove (216) respectively.

6. The mobile gantry crane with safety protection device according to claim 5, characterized in that: A fixed shaft (226) is fixedly installed on the connecting plate (223). A sliding groove (227) is provided on the inner wall of the fixed shaft (226). A sliding sleeve (228) is slidably installed on the inner wall of the sliding groove (227). A fastener (229) is fixedly installed on the sliding sleeve (228), and the fastener (229) is slidably connected to the limiting groove (212) and the limiting groove (216) respectively.

7. The mobile gantry crane with safety protection device according to claim 6, characterized in that: The linkage assembly (23) includes a connecting shaft (231) fixedly mounted on a connecting plate (223), a coil spring (232) fixedly mounted on the connecting shaft (231), and a rotating rod (233) fixedly mounted on the coil spring (232), and the rotating rod (233) is rotatably connected to the connecting plate (223).

8. The mobile gantry crane with safety protection device according to claim 7, characterized in that: A conical part (234) is rotatably mounted on the rotating rod (233). A rotating slide rod (235) is slidably mounted on the inner wall of the conical part (234). The rotating slide rod (235) passes through the conical part (234) and is fixedly connected to the rotating rod (233). A connecting block (237) is fixedly mounted on the conical part (234). A connecting spring (238) is fixedly mounted on the connecting block (237). A protective part (239) is fixedly mounted on the other end of the connecting spring (238).

9. The mobile gantry crane with safety protection device according to claim 8, characterized in that: The protective component (239) includes a linkage rod (2391) rotatably mounted on the connecting plate (223), a connecting block two (2392) fixedly mounted on the linkage rod (2391), a rotating rod (2393) fixedly mounted on the other end of the connecting block two (2392), a connecting sleeve (2394) fixedly mounted on the rotating rod (2393), a damping spring (2395) fixedly mounted on the connecting sleeve (2394), and a buckle two (2396) fixedly mounted on the damping spring (2395), and the buckle two (2396) is slidably connected to the limiting groove one (212) and the limiting groove two (216) respectively.

10. The mobile gantry crane with safety protection device according to claim 9, characterized in that: The drive assembly (31) includes a support steel (311) fixedly mounted on a secondary support frame (215), a fastener (312) fixedly mounted on the support steel (311), an elastic rope (313) fixedly mounted on the fastener (312), a fixed shaft (314) fixedly mounted on the other end of the elastic rope (313), a movable steel (315) fixedly mounted on the fixed shaft (314), and a lifting component (316) slidably mounted on the movable steel (315), wherein the movable steel (315) is fixedly connected to the fixed plate (224).

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