Brake device for super-span door seat machine for shipyard dock lifting hatch cover

Abstract

The invention discloses a braking device for a super-span door seat machine for lifting a hatch cover in a shipyard dock, and belongs to the field of braking equipment. Comprising a door seat machine body and a walking assembly, the walking assembly is installed on the door seat machine body, the walking assembly comprises a supporting frame installed at the lower end of the door seat machine body, multiple sets of electric driving wheels and moving wheels are installed on the two sides of the lower end of the supporting frame, and the multiple sets of braking assemblies are symmetrically installed on the two sides of the supporting frame; the brake assembly comprises a positioning plate installed on the inner side of the supporting frame, an electric push rod is installed at the upper end of the positioning plate, and a push block is installed at the output end of the electric push rod. According to the braking device for the super-span door seat machine for the shipyard dock lifting hatch cover, ratchets are pushed by the electric push rod to be clamped into the tooth gaps of the ratchet wheel, a moving wheel rolling shaft is directly locked, and even if a traditional brake fails, the door seat machine can still be prevented from moving.

Description

Technical Field

[0001] This invention relates to the field of braking equipment technology, and in particular to a braking device for a long-span gantry crane used for lifting hatch covers in shipyard docks. Background Technology

[0002] After the hatch coaming welding is completed in the dry dock, preparations for the hatch cover hoisting are required. A gantry crane is used for hoisting. The gantry crane moves to the appropriate position via its traveling mechanism, securely connects the lifting gear to the hatch cover, and then slowly lifts the hatch cover off the ground at a certain height. After lifting, the hatch cover is moved horizontally to the designated installation position. Once the hatch cover reaches the installation position, it is slowly lowered, and the hatch cover is accurately installed onto the hatch coaming using accessories such as positioning pins, anti-slip devices, and support plates for fixing and connection.

[0003] Existing gantry crane traveling mechanisms typically include an electric drive system and wheels. The wheels at the bottom of the gantry crane are mounted on tracks. The electric drive system rotates the wheels, enabling the gantry crane to move laterally or longitudinally along the tracks, thereby moving the hatch horizontally to change the working position. When the gantry crane reaches the predetermined position, it typically uses hydraulically driven block or disc brakes. The brakes are rigidly connected to the wheel hubs and rotate synchronously with the wheels. During braking, hydraulic oil pushes the brake cylinder piston, causing the brake shoes (or brake pads) to clamp the brake wheel (or brake disc), forcing the wheel to decelerate until it stops through friction. When releasing the brake, the hydraulic oil is depressurized, the springs return to their original position, pulling the shoes apart and releasing the wheel. However, this single braking method has certain shortcomings. Traditional brakes rely on the contact between friction pads and brake wheels to generate braking force. After long-term use, the friction pads will wear down, reducing their thickness. Simultaneously, the brake wheel surface may also experience wear or thermal deformation, causing a gradual decrease in actual braking torque. Due to the lack of a braking protection mechanism, if a single traditional brake malfunctions (such as insufficient pressure due to hydraulic system leakage, short circuits or open circuits in electrical control components, or sudden detachment of friction pads), the braking function will be directly lost. When the gantry crane is lifting hatch covers under heavy load, if the braking force attenuation is not detected in time, the inertia during lifting may cause the crane to slip, seriously threatening operational safety. Therefore, it is necessary to design a braking device for long-span gantry cranes used for lifting hatch covers in shipyards and dry docks.

[0004] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0005] This invention provides a braking device for a long-span gantry crane used for lifting hatch covers in a shipyard dry dock, in order to solve the problem that if a traditional brake fails, the crane may slip, seriously threatening operational safety.

[0006] The present invention employs the following technical solution: a braking device for a long-span gantry crane used for lifting hatch covers in a shipyard dry dock. It includes the gantry crane body; A traveling assembly, mounted on the gantry crane body, includes a support frame mounted on the lower end of the gantry crane body. Multiple sets of electric drive wheels and moving wheels are mounted on both sides of the lower end of the support frame. Multiple braking assemblies are symmetrically installed on both sides of the support frame. Each braking assembly includes a positioning plate installed inside the support frame, and an electric push rod is installed at the upper end of the positioning plate. A push block is installed at the output end of the electric push rod. A first drive shaft is rotatably installed at the front end of the push block. A ratchet is installed on the outer wall of the first drive shaft. A second drive shaft is installed after passing through the support frame on one side of the roller on the moving wheel. A ratchet is installed on the outer wall of the second drive shaft, and the ratchet can be engaged in the gap between any two teeth on the ratchet. A reset mechanism is provided between the first drive shaft and the ratchet. Mounting bracket, which is mounted on the support frame; A cleaning component, which is mounted on the mounting bracket; A drive assembly, which is mounted on the mounting bracket; A protective component is mounted on one side of the mounting bracket.

[0007] Furthermore, the reset mechanism includes torsion springs movably sleeved on both sides of the first transmission shaft. One side of the torsion spring is fixedly connected to the push block, and the other side of the torsion spring is fixedly connected to the ratchet. A roller is rotatably mounted on the front end of the ratchet.

[0008] Furthermore, T-shaped grooves are provided on both sides of the upper end of the positioning plate, and T-shaped blocks are installed on both sides of the lower end of the push block. The two T-shaped blocks can slide inside the corresponding T-shaped grooves.

[0009] Furthermore, the cleaning assembly includes a rotating shaft installed at the lower end of the mounting bracket, a sleeve is fitted on the outer wall of the rotating shaft, a brush is installed on the outer wall of the sleeve, and a limiting mechanism for locking the sleeve is provided on the rotating shaft and the sleeve.

[0010] Furthermore, the limiting mechanism includes a locking bolt threaded onto the sleeve, threaded holes are provided at both ends of the rotating shaft, and the sleeve is fitted onto the rotating shaft. When the lower end of the locking bolt is aligned with the threaded hole, the locking bolt can be threaded into the threaded hole. The mounting bracket is provided with a connecting mechanism for fixing the rotating shaft.

[0011] Furthermore, the connecting mechanism includes a limiting block installed at the other end of the mounting bracket, and a circular channel for mounting a rotating shaft is provided between the limiting block and the mounting bracket. The other end of the rotating shaft is installed in the circular channel between the limiting block and the mounting bracket.

[0012] Furthermore, the drive assembly includes a positioning frame fixedly mounted on one side of the mounting bracket. A first connecting shaft is rotatably mounted on the lower end of the positioning frame, and a second connecting shaft is rotatably mounted on the middle of one side of the mounting bracket. A first bevel gear is fixedly mounted on one end of the second drive shaft. A second bevel gear is mounted on one end of the first connecting shaft after passing through the positioning bracket. A third bevel gear is mounted on the other end of the first connecting shaft after passing through the positioning bracket. A fourth bevel gear is mounted on one side of the second connecting shaft after passing through the mounting bracket. The first bevel gear meshes with the second bevel gear, and the third bevel gear meshes with the fourth bevel gear.

[0013] Furthermore, a first synchronous pulley is installed on the outer wall of one side of the second connecting shaft, and a second synchronous pulley is installed on the outer wall of one side of the rotating shaft, and a synchronous belt is driven on the first and second synchronous pulleys.

[0014] Furthermore, the protective assembly includes a protective housing mounted on one side of the mounting bracket, and a protective door is hinged to one side of the protective housing.

[0015] Furthermore, hanging rings are provided on both sides of the upper end of the protective door, and hooks are correspondingly installed on the outer wall of the protective shell. The hanging rings are fastened to the hooks, and a handle is fixedly installed on the upper end of the protective door.

[0016] The above-described at least one technical solution adopted in the embodiments of the present invention can achieve the following beneficial effects: A braking device for a gantry crane used for lifting hatch covers in shipyard docks is provided. The device uses an electric push rod to push a ratchet into the gap between the ratchet teeth, directly locking the moving wheel roller. Even if the traditional brake fails, it can still prevent the gantry crane from moving, thus avoiding slippage and improving the safety of the gantry crane lifting hatch covers. Attached Figure Description

[0017] The accompanying drawings, which are provided to further illustrate the invention and constitute a part of this invention, are illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention.

[0018] In the attached diagram: Figure 1 This is an overall schematic diagram of a braking device for a super-span gantry crane used for lifting hatch covers in a shipyard dry dock, as described in this application. Figure 2A front view schematic diagram of a braking device for a super-span gantry crane used for lifting hatch covers in a shipyard dry dock. Figure 3 This is a schematic diagram of the walking component structure; Figure 4 This is a schematic diagram of a partial structure of the walking component; Figure 5 This is a schematic diagram of the exploded structure of the walking component; Figure 6 A schematic diagram of the braking assembly installation structure; Figure 7 Schematic diagram of the braking and cleaning components; Figure 8 A schematic diagram of the exploded structure of the cleanup component; Figure 9 Schematic diagram of a partial structure of the braking assembly Figure 1 ; Figure 10 Schematic diagram of a partial structure of the braking assembly Figure 2 ; Figure 11 for Figure 1 Enlarged view of point A in the middle; Figure 12 for Figure 2 Enlarged view of point B in the middle; Figure 13 for Figure 3 Enlarged view of point C in the middle; Figure label: 1. Door base machine body; 2. Walking assembly; 21. Support frame; 22. Electric drive wheel; 23. Mobility wheel; 3. Braking assembly; 31. Positioning plate; 32. Electric push rod; 33. Push block; 34. First drive shaft; 35. Ratchet; 36. Torsion spring; 37. Roller; 38. Second drive shaft; 39. Ratchet; 310. T-slot; 311. T-block; 4. Mounting bracket; 5. Cleaning components; 51. Rotating shaft; 52. Sleeve; 53. Brush; 54. Locking bolt; 55. Limit block; 6. Drive assembly; 61. Positioning frame; 62. First connecting shaft; 63. First bevel gear; 64. Second bevel gear; 65. Third bevel gear; 66. Second connecting shaft; 67. Fourth bevel gear; 68. First synchronous pulley; 69. Second synchronous pulley; 610. Synchronous belt; 7. Protective components; 71. Protective housing; 72. Protective door; 73. Hanging ring; 74. Hook; 75. Handle. Detailed Implementation

[0019] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0020] The technical solutions provided by the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0021] Reference Figures 1 to 13 As shown, this embodiment of the invention provides a braking device for a long-span gantry crane used for lifting hatch covers in a shipyard dock. The device includes a gantry crane body 1 for lifting hatch covers. A traveling component 2 is provided at the lower end of the gantry crane body 1 for driving the gantry crane body 1 to move on a track (not shown in the figure). The traveling component 2 includes a support frame 21 fixedly installed at the lower end of the gantry crane body 1. Multiple sets of electric drive wheels 22 and moving wheels 23 are installed on both sides of the lower end of the support frame 21. The moving wheels 23 are installed at the front end of the electric drive wheels 22.

[0022] The electric drive wheel 22 includes an electric drive system, wheels (not shown in the figure), and brakes (not shown in the figure). The wheels are mounted on the track. The electric drive system drives the wheels to rotate, enabling the gantry crane body 1 to move laterally or longitudinally along the track, thereby moving the hatch cover horizontally to change the working position. When the gantry crane body 1 moves to the predetermined position, it is braked by the installed brakes. The working principle of the electric drive wheel 22 is a mature existing technology, so it will not be described in detail.

[0023] Reference Figures 5 to 10 As shown, multiple braking assemblies 3 are provided on the inner side of the support frame 21. The braking assembly 3 includes a positioning plate 31 welded and fixedly installed on the inner side of the support frame 21. A reinforcing rib (not marked in the figure) is welded and fixed between the lower end of the positioning plate 31 and the support frame 21. An electric push rod 32 is fixedly installed on the upper end of the positioning plate 31. A push block 33 is fixedly installed on the output end of the electric push rod 32. A first transmission shaft 34 is rotatably installed on the front end of the push block 33. A ratchet 35 is fixedly installed on the outer wall of the first transmission shaft 34.

[0024] A reset mechanism is provided between the first drive shaft 34 and the ratchet 35. The reset mechanism includes torsion springs 36 movably sleeved on both sides of the first drive shaft 34. One side of the torsion spring 36 is fixedly connected to the push block 33, and the other side of the torsion spring 36 is fixedly connected to the ratchet 35. When no external force is applied, the ratchet 35 can maintain a slightly raised state. A roller 37 is rotatably installed at the front end of the ratchet 35. A second drive shaft 38 is fixedly installed on one side of the roller of the moving wheel 23 after passing through the support frame 21. A ratchet 39 is fixedly installed on the outer wall of the second drive shaft 38. The ratchet 35 can be engaged in the gap between any two teeth on the ratchet 39.

[0025] When the ratchet 35 engages with the gap between any two teeth on the ratchet 39, the ratchet 35 rotates due to the uncertainty of the stopping position of the ratchet 39. This upward rotation of the ratchet 35 facilitates its engagement with the gap between any two teeth on the ratchet 39. Furthermore, the roller 37 braked on the ratchet 35 reduces the friction generated when the ratchet 35 disengages from the ratchet 39.

[0026] T-shaped grooves 310 are provided on both sides of the upper end of the positioning plate 31, and T-shaped blocks 311 are fixedly installed on both sides of the lower end of the push block 33. The two T-shaped blocks 311 can slide inside the corresponding T-shaped grooves 310, which can limit the push block 33.

[0027] When no external force is applied, the torsion spring 36 is in its natural state, and its elasticity keeps the ratchet 35 slightly raised. At this time, the ratchet 35 and the ratchet 39 are not in contact, and there is a gap between them. The roller of the moving wheel 23 and the second drive shaft 38 and ratchet 39 connected to it can rotate freely, and the entire device can move normally.

[0028] When the gantry motor body 1 stops and further braking of the gantry motor body 1 is required, the electric push rod 32 is activated, its output end extends and pushes the push block 33 forward. At this time, the T-shaped block 311 at the lower end of the push block 33 slides synchronously in the T-shaped groove 310 of the positioning plate 31. The T-shaped structure restricts the direction of movement of the push block 33, ensuring that it can only move forward in a straight line and avoids deviation.

[0029] As the push block 33 moves forward, the ratchet 35, connected to the front end of the push block 33 via the first drive shaft 34, also moves forward. When the ratchet 35 contacts the ratchet 39, the electric push rod 32 continuously applies force. When the tooth gap between the ratchet 35 and the ratchet 39 does not correspond, the ratchet 35 can be forced to overcome the elastic force of the torsion spring 36 and rotate upward, eventually locking into the gap between any two teeth of the ratchet 39. At this time, the ratchet 39 is stuck by the ratchet 35 and cannot rotate. Since the ratchet 39 and the roller of the moving wheel 23 are fixedly connected via the second drive shaft 38, the roller cannot rotate, the moving wheel 23 is braked, and the device stops moving.

[0030] When the braking state is released, the output end of the electric push rod 32 retracts, pulling the push block 33 to move backward. The T-shaped block 311 also slides in the opposite direction in the T-shaped groove 310, ensuring that the push block 33 is smoothly reset.

[0031] Push block 33 drives ratchet 35 to move backward, and ratchet 35 gradually disengages from the tooth gap of ratchet 39. At this time, the elastic force of torsion spring 36 is restored, pushing ratchet 35 back to a slightly raised state, re-establishing a gap with ratchet 39. The rollers of ratchet 39 and moving wheel 23 resume free rotation, and the gantry machine body 1 can move normally again.

[0032] Reference Figures 7 to 8 As shown, a mounting bracket 4 is fixedly installed on the support frame 21 by bolts. A cleaning component 5 is provided at the lower end of the mounting bracket 4. The cleaning component 5 includes a rotating shaft 51 installed at the lower end of the mounting bracket 4. A sleeve 52 is sleeved on the outer wall of the rotating shaft 51. A brush 53 is fixedly installed on the outer wall of the sleeve 52. Locking bolts 54 are threaded on both ends of the sleeve 52. Threaded holes are opened at both ends of the rotating shaft 51. When the sleeve 52 is sleeved on the rotating shaft 51 and the locking bolts 54 are aligned with the threaded holes, the locking bolts 54 can be threaded into the threaded holes.

[0033] The mounting bracket 4 is provided with a connecting mechanism for fixing the rotating shaft 51, and one end of the rotating shaft 51 is rotatably connected to the mounting bracket 4. The connecting mechanism includes a limiting block 55 fixedly installed on the other end of the mounting bracket 4 by bolts. A circular channel for installing the rotating shaft 51 is provided between the limiting block 55 and the mounting bracket 4. The other end of the rotating shaft 51 is installed in the circular channel between the limiting block 55 and the mounting bracket 4. By removing the locking bolts 54 on the limiting block 55 and the sleeve 52, it is easy to replace the sleeve 52 and the brush 53.

[0034] Reference Figure 6 , Figure 7 and Figure 13 As shown, a drive assembly 6 is provided on one side of the mounting bracket 4. The drive assembly 6 includes a positioning bracket 61 fixedly installed on one side of the mounting bracket 4. The positioning bracket 61 is welded and fixed on the mounting bracket 4. A first connecting shaft 62 is rotatably installed at the lower end of the positioning bracket 61, and a second connecting shaft 66 is rotatably installed in the middle of one side of the mounting bracket 4.

[0035] Furthermore, a first bevel gear 63 is fixedly installed at one end of the second drive shaft 38, and the second drive shaft 38 rotates synchronously with the moving wheel 23. One end of the first connecting shaft 62 passes through the positioning frame 61 and is fixedly installed with a second bevel gear 64. The other end of the first connecting shaft 62 passes through the positioning frame 61 and is fixedly installed with a third bevel gear 65. One side of the second connecting shaft 66 passes through the mounting frame 4 and is fixedly installed with a fourth bevel gear 67. The first bevel gear 63 meshes with the second bevel gear 64, and the third bevel gear 65 meshes with the fourth bevel gear 67.

[0036] Meanwhile, a first synchronous wheel 68 is fixedly installed on the outer wall of one side of the second connecting shaft 66, and a second synchronous wheel 69 is fixedly installed on the outer wall of one side of the rotating shaft 51. A synchronous belt 610 is provided on the first synchronous wheel 68 and the second synchronous wheel 69 to drive the rotating shaft 51 to rotate the sleeve 52 and the brush 53 to clean the track.

[0037] When the gantry machine body 1 moves, the rollers of the moving wheel 23 rotate, and the second drive shaft 38, which is fixedly connected to the rollers, rotates together. At this time, the first bevel gear 63 at one end of the second drive shaft 38 rotates synchronously. Since the first bevel gear 63 is meshed with the second bevel gear 64 at one end of the first connecting shaft 62, the first connecting shaft 62 begins to rotate under the drive of the second bevel gear 64. When the first connecting shaft 62 rotates, the third bevel gear 65 at its other end rotates accordingly. The third bevel gear 65 meshes with the fourth bevel gear 67 on one side of the second connecting shaft 66, causing the second connecting shaft 66 to rotate under the drive of the fourth bevel gear 67. During the rotation of the second connecting shaft 66, the first synchronous pulley 68 on its outer wall rotates synchronously. Through the synchronous belt 610 sleeved on the first synchronous pulley 68 and the second synchronous pulley 69 on one side of the rotating shaft 51, the power is transmitted to the rotating shaft 51. The rotating shaft 51 then drives the sleeve 52 sleeved on its outer wall and the brush 53 fixedly installed on the sleeve 52 to rotate. The rotating brush 53 can clean the track. During this process, one end of the rotating shaft 51 is rotatably connected to the mounting bracket 4, and the other end is installed in the circular channel between the limiting block 55 and the mounting bracket 4. This installation method not only ensures that the rotating shaft 51 can rotate stably, but also provides a basis for subsequent disassembly and replacement. When it is necessary to replace the brush 53, first remove the bolts connecting the limit block 55 to the mounting bracket 4, and remove the limit block 55, so that the other end of the rotating shaft 51 is unrestrained. Next, unscrew the locking bolts 54 at both ends of the sleeve 52. Since the locking bolts 54 were originally threaded into the threaded holes at both ends of the rotating shaft 51, after the bolts are removed, the sleeve 52 can be removed from the rotating shaft 51, thus completing the disassembly of the old brush 53. When installing a new brush 53, place the sleeve 52 containing the new brush 53 onto the rotating shaft 51, align the locking bolts 54 at both ends of the sleeve 52 with the threaded holes of the rotating shaft 51, and tighten the locking bolts 54 to secure the sleeve 52. Then, place the other end of the rotating shaft 51 into the corresponding position on the mounting bracket 4, install the limit block 55, and tighten the bolts. This restricts the other end of the rotating shaft 51 within the circular channel between the limit block 55 and the mounting bracket 4, thus completing the replacement and ensuring that the brush 53 can continue to work normally.

[0038] Reference Figure 11As shown, a protective component 7 is provided on one side of the mounting bracket 4. The protective component 7 includes a protective shell 71 that is fixedly installed on one side of the mounting bracket 4 by bolts. A protective door 72 is connected to one side of the protective shell 71 by a hinge. Hanging rings 73 are provided on both sides of the upper end of the protective door 72, and hooks 74 are correspondingly installed on the outer wall of the protective shell 71. The hanging rings 73 are fastened to the hooks 74. The fastening principle of the hooks 74 and the hanging rings 73 is a mature existing technology, so it will not be described in detail. A handle 75 is fixedly installed on the upper end of the protective door 72. The protective door 72 is used to observe or inspect the braking component 3.

[0039] When it is necessary to observe the brake assembly 3, the operator can open the protective door 72 through the handle 75. Without disassembling any parts, the operator can directly observe the meshing status of the ratchet 35 and ratchet 39, the operation of the electric push rod 32, and whether the T-block 311 slides smoothly in the T-slot 310, thus promptly identifying any potential abnormalities. If the brake assembly 3 malfunctions and requires repair, opening the protective door 72 allows the operator to easily access all components of the brake assembly 3 for adjustment, repair, or replacement without disassembling the protective housing 71. This greatly simplifies the repair process and saves repair time and labor costs.

[0040] The components of the multiple sets of braking components 3, mounting brackets 4, cleaning components 5, drive components 6, and protective components 7 are all identical in structure. They are symmetrically installed on the inner sides of both ends of the support frame 21. When the ratchet 39 and ratchet 35 in the braking component 3 located on the inner side of the front end of the support frame 21 are engaged, the gantry crane body 1 can be prevented from moving backward. When the ratchet 39 and ratchet 35 in the braking component 3 located on the inner side of the rear end of the support frame 21 are engaged, the gantry crane body 1 can be prevented from moving forward. This can brake the moving wheels 23 of the gantry crane body 1 and prevent the gantry crane body 1 from slipping due to the inertia when lifting the hatch when the conventional brake fails.

[0041] Furthermore, the cleaning components 5 installed at both ends of the mounting bracket 4 can drive the sleeve 52 and the brush 53 to clean the travel tracks on both sides of the gantry machine body 1 through the drive components 6 at both ends.

[0042] Working principle: When operating in a shipyard dry dock, after the gantry crane with a large span lifts the hatch cover, it needs to move along the track via the traveling assembly 2 to adjust the working position. At this time, the electric drive system of the electric drive wheel 22 is activated, driving the wheel to rotate on the track. The gantry crane body 1 moves laterally or longitudinally accordingly, and the moving wheel 23 rotates synchronously. The entire device is in normal moving state.

[0043] During this process, the ratchet 35 in the braking assembly 3 remains slightly raised under the elastic force of the torsion spring 36 in its natural state, and does not contact the ratchet 39 on the second transmission shaft 38 on the side of the roller of the moving wheel 23. There is a gap between the two, which does not affect the free rotation of the moving wheel 23 and related components.

[0044] Meanwhile, the drive assembly 6 on one side of the mounting bracket 4 works as the moving wheel 23 rotates. The roller of the moving wheel 23 drives the second transmission shaft 38 to rotate, and the first bevel gear 63 at one end rotates synchronously. Through meshing with the second bevel gear 64, it drives the first connecting shaft 62 to rotate. The third bevel gear 65 at the other end of the first connecting shaft 62 meshes with the fourth bevel gear 67 on the second connecting shaft 66, causing the second connecting shaft 66 to rotate. In turn, the first synchronous pulley 68, the synchronous belt 610 and the second synchronous pulley 69 drive the rotating shaft 51 to rotate. The brush 53 on the outer wall of the sleeve 52 rotates accordingly to clean the track, ensuring that the track is clean and preventing debris from affecting the movement. Once the gantry crane body 1 has moved to the designated working position, the brake on the electric drive wheel 22 is activated first to initially brake the gantry crane body 1 and bring it to a stop. To further ensure safety and prevent slippage due to failure of the conventional brake, the braking assembly 3 inside the support frame 21 is activated for secondary braking.

[0045] At this time, the electric push rod 32 is activated, and its output end extends to push the push block 33 forward. The T-shaped block 311 at the lower end of the push block 33 slides synchronously in the T-shaped groove 310 of the positioning plate 31, ensuring that the push block 33 moves forward smoothly in a straight line. The ratchet 35 connected to the front end of the push block 33 through the first transmission shaft 34 moves forward accordingly. When the ratchet 35 contacts the ratchet 39, if the gap between the ratchet 35 and the teeth of the ratchet 39 does not correspond, the ratchet 35 will overcome the elastic force of the torsion spring 36 and rotate upward, eventually locking into the gap between any two teeth of the ratchet 39.

[0046] Since the ratchet 39 and the roller of the movable wheel 23 are fixedly connected through the second transmission shaft 38, the ratchet 39 cannot rotate after the ratchet 35 is engaged, and the movable wheel 23 is braked accordingly. In addition, since multiple sets of braking components 3 are symmetrically installed on the inner sides of both ends of the support frame 21, the braking components 3 on the inner front side can prevent the gantry machine from moving backward, and the ones on the inner rear side can prevent it from moving forward, effectively avoiding slippage caused by inertia. If it is necessary to observe or repair the brake assembly 3, the operator can open the protective door 72 through the handle 75 on the protective door 72, and the hanging ring 73 and hook 74 will separate. Without disassembling the parts, the operator can directly observe the meshing status of the ratchet 35 and ratchet 39, the working status of the electric push rod 32, and whether the T-block 311 slides smoothly, which makes it easy to detect abnormalities in time. During maintenance, opening the protective door 72 also makes it easy to access and operate each component. When the gantry crane body 1 needs to move again, the braking state is first released. The output end of the electric push rod 32 retracts, pulling the push block 33 backward. The T-block 311 slides in the opposite direction within the T-slot 310, and the push block 33 drives the ratchet 35 to disengage from the tooth gap of the ratchet 39. At this time, the torsion spring 36 recovers its elasticity, pushing the ratchet 35 back to a slightly raised state. The ratchet 35 separates from the ratchet 39, and the ratchet 39 and the roller of the moving wheel 23 resume free rotation. Subsequently, the electric drive system of the electric drive wheel 22 is restarted, driving the gantry crane body 1 to move along the track. The braking device returns to its initial state, waiting for the next braking operation. Throughout the entire process, the braking assembly 3 works in conjunction with the brake of the electric drive wheel 22. When the traditional brake fails, the braking assembly 3 can reliably brake, ensuring the safe operation of the gantry crane body 1.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A braking device for a long-span gantry crane used for lifting hatch covers in a shipyard dry dock, comprising a gantry crane body (1). A walking assembly (2) is mounted on the gantry machine body (1). The walking assembly (2) includes a support frame (21) mounted on the lower end of the gantry machine body (1). Multiple sets of electric drive wheels (22) and moving wheels (23) are mounted on both sides of the lower end of the support frame (21). The walking assembly (2) is characterized by: Also includes Multiple braking components (3) are symmetrically installed on both sides of the support frame (21). Each braking component (3) includes a positioning plate (31) installed inside the support frame (21). An electric push rod (32) is installed on the upper end of the positioning plate (31). A push block (33) is installed at the output end of the electric push rod (32). A first transmission shaft (34) is rotatably installed at the front end of the push block (33). A ratchet (35) is installed on the outer wall of the first transmission shaft (34). A second transmission shaft (38) is installed on one side of the roller on the moving wheel (23) after passing through the support frame (21). A ratchet (39) is installed on the outer wall of the second transmission shaft (38). The ratchet (35) can be engaged in the gap between any two teeth on the ratchet (39). A reset mechanism is provided between the first transmission shaft (34) and the ratchet (35). Mounting bracket (4), which is mounted on the support frame (21); Cleaning component (5), which is mounted on the mounting bracket (4); A drive assembly (6) is mounted on the mounting bracket (4); A protective component (7) is mounted on one side of the mounting bracket (4).

2. The braking device for a long-span gantry crane used for lifting hatch covers in a shipyard dry dock, as described in claim 1, is characterized in that: The reset mechanism includes torsion springs (36) movably sleeved on both sides of the first transmission shaft (34). One side of the torsion spring (36) is fixedly connected to the push block (33), and the other side of the torsion spring (36) is fixedly connected to the ratchet (35). A roller (37) is rotatably mounted on the front end of the ratchet (35).

3. The braking device for a long-span gantry crane used for lifting hatch covers in a shipyard dry dock, as described in claim 1, is characterized in that: The positioning plate (31) has T-shaped grooves (310) on both sides of its upper end, and T-shaped blocks (311) are installed on both sides of its lower end. The two T-shaped blocks (311) can slide inside the corresponding T-shaped grooves (310).

4. A braking device for a long-span gantry crane used for lifting hatch covers in a shipyard dry dock, as described in claim 1, characterized in that: The cleaning assembly (5) includes a rotating shaft (51) installed at the lower end of the mounting bracket (4). A sleeve (52) is fitted on the outer wall of the rotating shaft (51). A brush (53) is installed on the outer wall of the sleeve (52). A limiting mechanism for locking the sleeve (52) is provided on the rotating shaft (51) and the sleeve (52).

5. A braking device for a long-span gantry crane used for lifting hatch covers in a shipyard dry dock, as described in claim 4, characterized in that: The limiting mechanism includes a locking bolt (54) threaded on a sleeve (52). The two ends of the rotating shaft (51) are provided with threaded holes. The sleeve (52) is sleeved on the rotating shaft (51). When the lower end of the locking bolt (54) is aligned with the threaded hole, the locking bolt (54) can be threaded into the threaded hole. The mounting bracket (4) is provided with a connecting mechanism for fixing the rotating shaft (51).

6. A braking device for a long-span gantry crane used for lifting hatch covers in a shipyard dry dock, as described in claim 5, characterized in that: The connecting mechanism includes a limiting block (55) installed at the other end of the mounting bracket (4), and a circular channel for installing a rotating shaft (51) is provided between the limiting block (55) and the mounting bracket (4). The other end of the rotating shaft (51) is installed in the circular channel between the limiting block (55) and the mounting bracket (4).

7. A braking device for a long-span gantry crane used for lifting hatch covers in a shipyard dry dock, as described in claim 1, characterized in that: The drive assembly (6) includes a positioning frame (61) fixedly mounted on one side of the mounting frame (4). A first connecting shaft (62) is rotatably mounted on the lower end of the positioning frame (61). A second connecting shaft (66) is rotatably mounted on the middle of one side of the mounting frame (4). A first bevel gear (63) is fixedly mounted on one end of the second drive shaft (38). A second bevel gear (64) is mounted on one end of the first connecting shaft (62) after passing through the positioning frame (61). A third bevel gear (65) is mounted on the other end of the first connecting shaft (62) after passing through the positioning frame (61). A fourth bevel gear (67) is mounted on one side of the second connecting shaft (66) after passing through the mounting frame (4). The first bevel gear (63) meshes with the second bevel gear (64), and the third bevel gear (65) meshes with the fourth bevel gear (67).

8. A braking device for a long-span gantry crane used for lifting hatch covers in a shipyard dry dock, as described in claim 7, characterized in that: A first synchronous pulley (68) is installed on the outer wall of one side of the second connecting shaft (66), and a second synchronous pulley (69) is installed on the outer wall of one side of the rotating shaft (51). A synchronous belt (610) is provided on the first synchronous pulley (68) and the second synchronous pulley (69).

9. A braking device for a long-span gantry crane used for lifting hatch covers in a shipyard dry dock, as described in claim 1, characterized in that: The protective assembly (7) includes a protective housing (71) mounted on one side of the mounting bracket (4), and a protective door (72) is connected to one side of the protective housing (71) by a hinge.

10. A braking device for a long-span gantry crane used for lifting hatch covers in a shipyard dry dock, as described in claim 9, characterized in that: Hanging rings (73) are provided on both sides of the upper end of the protective door (72), and hooks (74) are installed on the outer wall of the protective shell (71). The hanging rings (73) are fastened to the hooks (74), and a handle (75) is fixedly installed on the upper end of the protective door (72).

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