Emergency braking device for variable amplitude system of gantry crane

Abstract

The utility model discloses an emergency braking device for an amplitude variation system of a gantry crane. A braking guide rail unit extends along the extension direction of an amplitude variation rack; the braking execution unit comprises a fixed assembly and a sliding assembly, a sliding channel is formed in the fixed assembly, the braking guide rail unit penetrates through the sliding channel, the extending direction of the braking guide rail unit is defined as the first direction, and the cross section area of the sliding channel in the first direction is gradually reduced; in the process that the sliding assembly slides relative to the fixed assembly in the first direction, the sliding channel is used for guiding the sliding assembly to be gradually clamped on the braking guide rail unit and braking the variable-amplitude rack; the brake control unit is configured to collect motion information of the variable-amplitude rack so as to control starting and stopping of the brake driving unit. According to the utility model, the operation state of the variable-amplitude system of the gantry crane can be monitored, progressive emergency braking can be executed, and large impact on the variable-amplitude system in the emergency braking process is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of portal cranes, and specifically relates to an emergency braking device for the luffing system of a portal crane. Background Art

[0002] As a highly specialized heavy-duty material handling equipment, portal cranes are widely used in international trade ports, various industrial terminals, large-scale shipyards, warehousing and logistics centers, and even open-air stockyards that require efficient material turnover. Portal cranes play an important role in the modern industrial and logistics systems.

[0003] During long-term and frequent cyclic operations, the luffing system of a portal crane may, due to various reasons such as wear, fatigue, environmental factors, and human operation errors, pose a risk of functional degradation or even failure. Once the luffing system gets out of control, it may lead to the loss of control of the grab swing trajectory or the imbalance of the whole machine. To reduce potential safety hazards and improve the safety performance of portal cranes, it is particularly important to develop an automatic emergency braking device that can autonomously monitor the operating state and take braking measures in a timely manner. The existing braking systems do not have an emergency braking device with immediate response. In an emergency, even if the system can identify potential safety hazards, accidents may still occur due to the lack of immediate braking measures.

[0004] Therefore, developing an emergency braking device for the luffing system of a portal crane, which can monitor the operating state of the luffing system of the portal crane and can perform a progressive emergency braking to avoid causing a large impact on the luffing system during the emergency braking process, is a technical problem to be urgently solved. Summary of the Utility Model

[0005] In view of the problems pointed out in the background art, the utility model provides an emergency braking device for the luffing system of a portal crane, which can monitor the operating state of the luffing system of the portal crane and can perform a progressive emergency braking to avoid causing a large impact on the luffing system during the emergency braking process.

[0006] To achieve the above-mentioned utility model purpose, the utility model adopts the following technical solutions to be realized:

[0007] The present application provides an emergency braking device for the luffing system of a portal crane, which includes a braking guide rail unit, a braking execution unit, a braking drive unit, and a braking control unit; the braking guide rail unit is arranged to extend along the extension direction of the luffing rack; the braking execution unit includes a fixed component and a sliding component, a sliding passage is formed inside the fixed component, the braking guide rail unit passes through the sliding passage, the extension direction along the braking guide rail unit is defined as the first direction, and the sliding passage is configured such that the cross-sectional area gradually decreases along the first direction; during the process of the sliding component sliding relative to the fixed component along the first direction, the sliding passage is used to guide the sliding component to gradually clamp onto the braking guide rail unit for braking the luffing rack; during the process of the sliding component sliding relative to the fixed component in the direction opposite to the first direction, the sliding passage is used to guide the sliding component to gradually disengage from the braking guide rail unit; the braking drive unit drives the sliding component to slide relative to the fixed component; the braking control unit is configured to collect the motion information of the luffing rack to control the start and stop of the braking drive unit.

[0008] In some embodiments of the present application, the fixed component includes two relatively arranged fixed wedge blocks; the sliding passage is formed between the two fixed wedge blocks; the fixed wedge block includes a first end of the fixed wedge block and a second end of the fixed wedge block; the first end of the fixed wedge block and the second end of the fixed wedge block are arranged in sequence along the first direction; along the first direction, the distance between the two first ends of the fixed wedge blocks to the two second ends of the fixed wedge blocks gradually decreases.

[0009] In some embodiments of the present application, the sliding component includes two relatively sliding wedge blocks and a synchronizing frame, the synchronizing frame is used to drive the two sliding wedge blocks to move synchronously, and the sliding wedge block has elasticity; the sliding wedge block includes a first end of the sliding wedge block and a second end of the sliding wedge block; a guiding groove is formed on the fixed wedge block; the sliding wedge block moves along the guiding groove.

[0010] In some embodiments of the present application, the sliding component further includes two braking blocks, the two braking blocks are respectively embedded into the two sliding wedge blocks, sliding surfaces are formed on the adjacent surfaces of the two braking blocks, and the sliding surfaces are arranged parallel to the braking guide rail unit.

[0011] In some embodiments of the present application, the braking guide rail unit includes a braking guide rail component, and the braking guide rail component is arranged to extend along the extension direction of the luffing rack.

[0012] In some embodiments of the present application, the number of the braking guide rail units, the braking execution units and the braking drive units is two; the two braking guide rail units are respectively arranged oppositely on both sides of the luffing rack; the two braking execution units are respectively used for sliding connection with the two braking guide rail units.

[0013] In some embodiments of the present application, the braking drive unit includes an electric oil pump and a hydraulic cylinder. The electric oil pump delivers hydraulic oil to the hydraulic cylinder, and the hydraulic cylinder drives the synchronous frame to reciprocate.

[0014] In some embodiments of the present application, the braking control unit includes a controller and a speed sensor. The speed sensor is electrically connected to the controller. The speed sensor is used to detect the running speed of the luffing rack, and the speed sensor is used to be electrically connected to the luffing system.

[0015] In some embodiments of the present application, the braking execution unit further includes a housing and a bushing; the bushing is sleeved outside the fixed component; the housing is fixedly arranged on the luffing rocker.

[0016] In some embodiments of the present application, the synchronous frame includes a driving rod and two connecting frames. The two connecting frames are respectively connected to both sides of the driving rod. The two connecting frames are respectively connected to the two sliding wedges, and the driving rod is connected to the braking drive unit.

[0017] Compared with the prior art, the advantages and positive effects of the present utility model are:

[0018] By arranging the braking guide rail unit on the luffing rack along the extending direction of the luffing rack;

[0019] By arranging the braking control unit to collect the motion information of the luffing rack to control the start or stop of the sliding component;

[0020] By arranging a sliding component on the luffing rack, arranging a fixed component on the luffing rocker, and arranging a sliding path in the fixed component. The sliding component moves along the sliding path, and the cross-sectional area of the sliding path gradually decreases in the first direction. During the relative movement of the sliding component along the sliding path, the sliding path is used to guide the sliding component so that the sliding component is gradually clamped on the braking guide rail unit, thereby realizing the progressive clamping braking of the luffing rack, and thus realizing the progressive emergency braking of the luffing rack in case of abnormality. At the same time, it avoids causing a large impact on the luffing system during the emergency braking process.

[0021] After reading the specific embodiments of the present utility model in conjunction with the drawings, other features and advantages of the present utility model will become clearer. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 One of the usage schematic diagrams of an embodiment of the present invention;

[0024] Figure 2 Another usage schematic diagram of an embodiment of the present invention;

[0025] Figure 3 One of the structural schematic diagrams of an embodiment of the present invention;

[0026] Figure 4 Another structural schematic diagram of an embodiment of the present invention;

[0027] Figure 5 For Figure 4 The partial enlarged view at position A in

[0028] Figure 6 One of the structural schematic diagrams of an embodiment of the present invention;

[0029] Figure 7 For Figure 6 The partial enlarged view at position B in

[0030] Reference numerals:

[0031] 100, braking guide rail unit;

[0032] 110, braking guide rail component;

[0033] 200, braking execution unit;

[0034] 211, sliding passage;

[0035] 212, fixed wedge block;

[0036] 2121, first end of the fixed wedge block;

[0037] 2122, second end of the fixed wedge block;

[0038] 2123, guide groove;

[0039] 220, sliding assembly;

[0040] 221, sliding wedge block;

[0041] 2211. First end of the sliding wedge block

[0042] 2212. Second end of the sliding wedge block

[0043] 222. Synchronization frame

[0044] 2221. Driving rod

[0045] 2222. Connecting frame

[0046] 223. Brake block

[0047] 230. Outer shell

[0048] 240. Bushing

[0049] 300. Brake drive unit

[0050] 410. Speed sensor

[0051] 510. Luffing rack

[0052] 520. Luffing rocker Detailed implementation mode

[0053] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0054] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0055] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0056] In the description of the present application, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0057] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is lower than that of the second feature.

[0058] The following disclosure provides many different embodiments or examples for implementing different structures of the present utility model. To simplify the disclosure of the present utility model, components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present utility model. In addition, the present utility model may repeat reference numerals and / or reference letters in different examples. Such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between various embodiments and / or settings discussed. In addition, the present utility model provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0059] As an indispensable important loading and unloading equipment in modern ports, docks and large industrial and mining enterprises, the stability and reliability of the luffing system of a portal crane are directly related to the safety and efficiency of operations. The luffing system mainly consists of core components such as motors, reducers, and brakes. These components work together to drive the goods forward or backward. However, during actual operations, the luffing system may be affected by various complex factors. First of all, insufficient braking torque is a common problem, which may lead to the inability to quickly and effectively stop the movement of the boom in case of an emergency. Secondly, damaged brake discs are also a major hidden danger. The damaged brake discs will directly affect the braking effect and cause the braking system to fail. In addition, faults such as broken shafts and coupling failures in the reduction gearbox may also cause the luffing system to get out of control, thereby triggering serious safety accidents.

[0060] At present, although the existing braking systems can ensure the safe operation of portal cranes to a certain extent, the integrity of these system components is difficult to be continuously guaranteed in the long-term complex operating environment. For example, the harsh working environment may cause accelerated wear of components, and frequent starts and stops may also impact the system, affecting its stability and reliability. The existing braking systems often lack emergency braking devices with immediate response. In case of an emergency, even if the system can identify potential safety hazards, accidents may occur due to the lack of immediate braking measures. Therefore, from a professional perspective, to improve the safety and reliability of the luffing system of portal cranes, not only the quality and performance of system components need to be concerned, but also the monitoring and early warning capabilities of the system need to be strengthened, as well as the research and development of more efficient and reliable emergency braking devices for the luffing system of portal cranes.

[0061] In this embodiment, as Figures 1 to 7 shown, it relates to an emergency braking device for the luffing system of a portal crane, including a braking guide rail unit 100, a braking execution unit 200, a braking drive unit 300, and a braking control unit.

[0062] As Figure 1 、 Figure 2 、 Figure 3 shown, the braking guide rail unit 100 extends along the extension direction of the luffing rack 510.

[0063] The braking execution unit 200 includes a fixed component and a sliding component 220.

[0064] A sliding passage 211 is formed inside the fixed component. The braking guide rail unit 100 passes through the sliding passage 211.

[0065] The extension direction along the braking guide rail unit 100 is defined as the first direction. The cross-sectional area of the sliding passage 211 gradually decreases along the first direction.

[0066] During the process of the sliding component 220 sliding relative to the fixed component along the first direction, the sliding passage 211 is used to guide the sliding component 220 to gradually clamp onto the braking guide rail unit 100 for braking the luffing rack 510.

[0067] Since the cross-sectional area of the sliding passage 211 gradually decreases along the first direction, during the process of the sliding component 220 moving along the first direction, it gradually clamps inside the sliding passage 211 formed by the fixed component.

[0068] Thus, the braking of the sliding component 220 by the fixed component is achieved.

[0069] During the process in which the sliding component 220 moves relative to the sliding path 211 formed within the fixed component in a direction opposite to the first direction, the sliding component 220 is unlocked relative to the fixed component. During this process, the sliding path 211 guides the sliding component 220, causing the sliding component 220 to gradually disengage from the braking guide rail unit 100.

[0070] The braking drive unit 300 drives the sliding component 220 to reciprocate relative to the sliding path 211.

[0071] In some embodiments of the present application, the braking drive unit 300 includes an electric oil pump and a hydraulic cylinder. The electric oil pump is driven by electricity and is responsible for supplying necessary pressurized oil to the hydraulic cylinder. The electric oil pump replaces the manual or pneumatic pump in the traditional system, improving the control accuracy and response speed. The high-pressure oil generated by the electric oil pump is delivered into the hydraulic cylinder. The piston inside the hydraulic cylinder moves under the action of the hydraulic oil, and this movement process is converted into mechanical force, which in turn drives the movement of the sliding component 220.

[0072] Due to the use of the hydraulically driven braking drive unit 300, when the braking control unit issues an emergency braking instruction, the electric oil pump generates high-pressure hydraulic oil, driving the piston of the hydraulic cylinder to reciprocate under the push of the high-pressure oil. Under the action of the high pressure, the hydraulic cylinder drives the connected sliding component 220 to slowly and powerfully clamp onto the braking guide rail component 110, thereby achieving emergency braking of the luffing rack 510. The progressive emergency braking device is not only reflected in the smooth transition of the braking process, avoiding damage to the equipment structure caused by excessive impact force, but also ensuring the stable and reliable braking effect.

[0073] Different from the instantaneous braking system, the above-mentioned sliding component 220 moves relative to the fixed component and gradually clamps, achieving progressive braking. This enables the luffing rack 510 not to immediately reach the maximum braking force when clamping the braking guide rail unit 100, but rather to have a process of gradually increasing the braking force. This means that the deceleration process of the luffing rack 510 is relatively gentle, effectively reducing the impact force and the structure is not damaged.

[0074] As the sliding component 220 slowly and firmly clamps onto the braking guide rail unit 100 during the process of moving within the fixed component, the luffing speed of the luffing rack 510 is gradually reduced until it completely stops.

[0075] In some embodiments of the application, the braking control unit is configured to collect the motion information of the luffing rack 510 to control the start and stop of the braking drive unit 300.

[0076] As Figure 1 shown, the braking control unit includes a speed sensor 410. The speed sensor 410 is used to detect the running speed of the luffing rack 510.

[0077] The speed sensor 410 is used to be electrically connected to the control system of the luffing carriage 520. The detected running speed of the luffing rack 510 is fed back to the luffing system.

[0078] Specifically, the speed sensor 410 is arranged on the luffing carriage 520. By detecting the running speed of the luffing rack 510, the speed sensor 410 judges the running condition of the luffing rack 510.

[0079] The control unit of the luffing system is provided with monitoring information of the luffing rack 510 for determining whether the luffing rack 510 needs emergency braking. If braking is required for the luffing rack 510, the luffing system controls the start or stop of the luffing rack 510 through the controller.

[0080] In some embodiments of the present application, such as Figure 4 , Figure 5 , Figure 6 , Figure 7 shown, the sliding assembly 220 includes two relatively sliding wedge blocks 221 and a synchronous frame 222. The end of the synchronous frame 222 is connected to the two sliding wedge blocks 221. The two sliding wedge blocks 221 are respectively connected to both sides of the end of the synchronous frame 222. The synchronous frame 222 drives the two sliding wedge blocks 221 to move.

[0081] Specifically, the braking drive unit 300 drives the synchronous frame 222 to reciprocate, thereby driving the two sliding wedge blocks 221 to reciprocate, so as to realize the reciprocating movement of the sliding assembly 220.

[0082] Specifically, the synchronous frame 222 includes a driving rod 2221 and two connecting frames 2222. The two connecting frames 2222 are respectively connected to both sides of the end of the driving rod 2221. The two connecting frames 2222 are respectively connected to the two sliding wedge blocks 221. The driving rod 2221 is connected to the braking drive unit 300.

[0083] Specifically, the driving rod 2221 is connected to the output end of the hydraulic cylinder.

[0084] The sliding assembly 220 further includes two brake blocks 223. The two brake blocks 223 are respectively embedded in the two sliding wedge blocks 221. Sliding surfaces are formed at the adjacent surfaces of the two brake blocks 223. The two sliding surfaces are in contact with the brake guide unit 100 and are clamped on the brake guide unit 100.

[0085] Specifically, the sliding surfaces are arranged parallel to the brake guide unit 100.

[0086] Specifically, the brake guide unit 100 includes a brake guide member 110. The brake guide member 110 is arranged along the extending direction of the luffing rack 510.

[0087] The braking guide rail component 110 is made of Q355B steel, which is the same as the steel used for the luffing rack 510. It has the characteristics of wear resistance and high strength, ensuring that it can withstand huge frictional forces without deformation during emergency braking.

[0088] The fixing component includes two relatively arranged fixing wedge blocks 212. A sliding passage 211 is formed between the two fixing wedge blocks 212.

[0089] The fixing wedge block 212 includes a first end 2121 of the fixing wedge block and a second end 2122 of the fixing wedge block.

[0090] The first end 2121 of the fixing wedge block and the second end 2122 of the fixing wedge block are arranged in sequence along the first direction.

[0091] Along the first direction, the distance between the two first ends 2121 of the fixing wedge blocks and the two second ends 2122 of the fixing wedge blocks gradually decreases. Thus, when the two sliding wedge blocks 221 slide relative to the two fixing wedge blocks 212, the two sliding wedge blocks 221 approach each other, gradually clamp on the braking guide rail component 110, and as the two sliding wedge blocks 221 move relative to the two fixing wedge blocks 212, the force clamping on the braking guide rail component 110 gradually increases, thereby achieving progressive braking.

[0092] In some embodiments of the present application, in order to enable the two sliding wedge blocks 221 to gradually clamp on the braking guide rail component 110 and the clamping force gradually increases, the sliding wedge blocks 221 are elastic.

[0093] Specifically, the sliding wedge blocks 221 can be made of materials such as rubber.

[0094] Specifically, the sliding wedge block 221 includes a first end 2211 of the sliding wedge block and a second end 2212 of the sliding wedge block.

[0095] A guide groove 2123 is formed on the fixing wedge block 212. The sliding wedge block 221 moves along the guide groove 2123.

[0096] In some embodiments of the present application, the braking execution unit 200 further includes a housing 230 and a bushing 240.

[0097] The bushing 240 is sleeved outside the fixing component, the housing 230 is sleeved outside the bushing 240, and the housing 230 and the bushing 240 are connected to the luffing rocker 520.

[0098] A braking guide rail unit is arranged on the luffing rack by extending along the extending direction of the luffing rack;

[0099] By setting a brake control unit, the motion information of the luffing rack is collected to control the start or stop of the sliding component;

[0100] By setting a fixing component on the luffing rack 510, a sliding component 220 is set on the luffing rocker. A sliding passage 211 is arranged in the fixing component. The sliding component moves along the sliding passage 211, and the cross-sectional area of the sliding passage 211 gradually decreases in the first direction. During the process of the sliding component 220 moving relative to the sliding passage 211, the sliding passage 211 is used to guide the sliding component 220 so that the sliding component 220 is gradually clamped on the brake guide unit 100, thereby realizing the progressive clamping brake of the luffing rack 510, and realizing the progressive emergency brake of the luffing rack 510 under abnormal conditions. At the same time, a large impact on the luffing system during the emergency brake is avoided.

[0101] In the description of the above embodiments, the specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0102] The above are only the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. An emergency braking device for the luffing system of a portal crane, characterized in that, Comprising: A braking guide rail unit, which is arranged on the luffing rack along the extension direction of the luffing rack; A braking execution unit, which includes a fixed component and a sliding component, the fixed component is arranged on the luffing rocker, and the sliding component is arranged on the luffing rack; A sliding passage is formed in the fixed component, the braking guide rail unit passes through the sliding passage, the extension direction along the braking guide rail unit is defined as the first direction, and the sliding passage is configured to gradually decrease in cross-sectional area along the first direction; During the process of the sliding component sliding relative to the fixed component along the first direction, the sliding passage guides the sliding component to gradually clamp on the braking guide rail unit for braking the luffing rack; During the process of the sliding component sliding relative to the fixed component in the direction opposite to the first direction, the sliding passage is used to guide the sliding component to gradually disengage from the braking guide rail unit; A braking drive unit, which drives the sliding component to slide relative to the fixed component; A braking control unit, which is configured to collect the motion information of the luffing rack to control the start and stop of the braking drive unit.

2. The emergency braking device for the luffing system of a portal crane according to claim 1, wherein The fixed component includes two relatively arranged fixed wedge blocks; The sliding passage is formed between the two fixed wedge blocks; The fixed wedge block includes a first end of the fixed wedge block and a second end of the fixed wedge block; The first end of the fixed wedge block and the second end of the fixed wedge block are arranged in sequence along the first direction; Along the first direction, the distance between the two first ends of the fixed wedge blocks to the two second ends of the fixed wedge blocks gradually decreases.

3. The luffing system emergency braking device of the portal crane according to claim 2, characterized in that, The sliding component includes two relatively sliding wedge blocks and a synchronous frame, the synchronous frame is used to drive the two sliding wedge blocks to move synchronously, and the sliding wedge block has elasticity; The sliding wedge block includes a first end of the sliding wedge block and a second end of the sliding wedge block; A guiding groove is formed on the fixed wedge block; The sliding wedge block moves along the guiding groove.

4. The emergency braking device for the luffing system of a portal crane according to claim 3, wherein The sliding component further includes two braking blocks, the two braking blocks are respectively embedded in the two sliding wedge blocks, and sliding surfaces are formed on the adjacent surfaces of the two braking blocks, and the sliding surfaces are arranged parallel to the braking guide rail unit.

5. The emergency braking device for the luffing system of a portal crane according to claim 1, wherein The braking guide rail unit includes a braking guide rail component, and the braking guide rail component is arranged along the extension direction of the luffing rack.

6. The emergency braking device for the luffing system of a portal crane according to claim 1, wherein The number of the braking guide rail unit, the braking execution unit and the braking drive unit is two; The two braking guide rail units are respectively arranged oppositely on both sides of the luffing rack; The two braking execution units are respectively used for sliding connection with the two braking guide rail units.

7. The emergency braking device for the luffing system of the portal crane according to claim 3, characterized in that, The braking drive unit includes an electric oil pump and a hydraulic cylinder. The electric oil pump delivers hydraulic oil to the hydraulic cylinder, and the hydraulic cylinder drives the synchronous frame to reciprocate.

8. The luffing system emergency braking device of the portal crane according to claim 1, characterized in that, The braking control unit includes a speed sensor for detecting the running speed of the luffing rack and for being electrically connected to the luffing system.

9. The emergency braking device for the luffing system of a portal crane according to claim 1, wherein the braking execution unit further includes a housing and a bushing; the bushing is sleeved outside the fixed assembly; the housing is fixedly arranged on the luffing rocker.

10. The luffing system emergency braking device of the portal crane according to claim 3, characterized in that, The synchronous frame includes a driving rod and two connecting frames. The two connecting frames are respectively connected to both sides of the driving rod, and the two connecting frames are respectively connected to the two sliding wedges. The driving rod is connected to the braking drive unit.

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