Two-stage braking device of rotating mechanism of gantry crane

Abstract

The utility model relates to the technical field of hoisting brake equipment, and provides a two-stage brake device of a rotating mechanism of a gantry crane, which comprises a base, the brake roller is rotationally arranged on the base and is in transmission connection with the rotating mechanism; one end of the first rotating rod is arranged on the base in a swinging manner; a swinging shaft of the first rotating rod is parallel to a rotating shaft of the brake roller; the brake pad is arranged on the first rotating rod in a swinging mode, and the first rotating rod is configured to be close to or away from the brake roller after swinging and abut against the surface of the brake roller in a sliding mode after swinging in the direction close to the brake roller. By means of the technical scheme, the problem that in the prior art, when a block brake adopted by a rotating mechanism of a gantry crane meets the braking requirement after high-speed rotation, the braking effect is poor is solved.

Description

Technical Field

[0001] This utility model relates to the technical field of hoisting braking equipment, specifically to a two-stage braking device for the rotating mechanism of a gantry crane. Background Technology

[0002] In port loading and unloading operations, gantry cranes play a crucial role. The slewing mechanism of a gantry crane is responsible for the horizontal rotation of the boom to complete the lifting and unloading of goods. Currently, most common braking devices for the slewing mechanism of gantry cranes use block brakes. These brakes achieve braking through the friction between the brake pads and the brake wheel. However, in practical applications, when the slewing mechanism of the gantry crane rotates at high speeds, existing braking devices reveal some significant problems. Due to the enormous inertia generated by the high-speed rotation of the slewing mechanism, a large braking force is required to stop it. This not only results in poor braking performance, making it difficult to stop the slewing mechanism quickly and stably, increasing operational risks and uncertainties, but also causes significant wear on the brake pads due to the enormous braking force. Frequent braking operations cause the brake pads to wear out rapidly, requiring frequent replacements, which not only increases maintenance costs but also affects the normal operating efficiency of the crane. Utility Model Content

[0003] This utility model proposes a two-stage braking device for the rotating mechanism of a gantry crane, which solves the problem that the block brake used in the rotating mechanism of a gantry crane in the related technology has poor braking effect when dealing with the braking demand after high-speed rotation.

[0004] The technical solution of this utility model is as follows:

[0005] A two-stage braking device for the slewing mechanism of a gantry crane, used to provide braking for the slewing mechanism of the gantry crane, includes:

[0006] Base;

[0007] A brake roller is rotatably mounted on the base and is connected to the rotating mechanism via a transmission connection.

[0008] The first rotating rod has one end swaying on the base, and the swaying axis of the first rotating rod is parallel to the rotation axis of the brake roller.

[0009] A brake pad is oscillatingly mounted on a first rotating rod, which is configured to oscillate towards or away from the brake roller, and after oscillating towards the brake roller, the brake pad slides against the surface of the brake roller.

[0010] As a further technical solution, it also includes:

[0011] The second rotating rod has one end swingably mounted on the base. The first rotating rod and the second rotating rod are located on opposite sides of the brake roller. The brake pad is also swingably mounted on the second rotating rod. The first rotating rod and the second rotating rod are configured to move closer to each other or further away after swinging. After swinging closer, the brake pads on the first rotating rod and the second rotating rod slide against the surface of the brake roller.

[0012] As a further technical solution, it also includes:

[0013] A linear drive unit, one end of which is oscillatingly mounted on the base;

[0014] A transmission block, which is oscillatingly mounted on the output end of the linear drive component;

[0015] A support member, one end of which is hinged to the base and the other end of which is hinged to one end of the transmission block;

[0016] The first connecting rod has one end hinged to the first rotating rod and the other end hinged to the transmission block. The second rotating rod is also hinged to the transmission block. The hinge point of the first connecting rod and the second rotating rod is located on one side of the hinge point between the transmission block and the linear drive member, and the hinge point between the support member and the transmission block is located on the other side.

[0017] As a further technical solution, the brake roller also has a radially extending groove, the groove having an outlet portion located at one end of the groove away from the rotation axis of the brake roller, and further includes:

[0018] A collar is provided, which is rotatably coaxial with the brake roller. The inner wall of the collar slides against the outer wall of the brake roller. The collar has an inner groove. The collar is configured such that, after rotating relative to the brake roller, the outlet portion communicates with or is not communicated with the inner groove.

[0019] A sliding block is slidably disposed in the slide groove. The sliding block has a locking part. The sliding block is configured such that after the outlet part communicates with the inner slot, the locking part engages with or leaves the inner slot after the sliding block slides.

[0020] As a further technical solution, it also includes:

[0021] A first elastic element has one end acting on the bottom wall of the groove and the other end acting on the sliding block, providing a force to the sliding block to approach the bottom wall of the groove.

[0022] As a further technical solution, it also includes:

[0023] The outer casing is disposed on one side of the brake roller. The outer casing has an annular sliding cavity. The collar is rotatably disposed within the annular sliding cavity. The annular sliding cavity has a first inner ring wall and a second inner ring wall. The first inner ring wall is located outside the second inner ring wall. The outer wall of the collar has a sliding portion. The collar is configured such that the inner wall of the collar slides against the second inner ring wall, and after rotation, the sliding portion slides against the first inner ring wall.

[0024] As a further technical solution, the first inner ring wall has a first stop portion, and the collar is configured such that after rotation, the sliding portion moves closer to or further away from the first stop portion.

[0025] As a further technical solution, it also includes:

[0026] A second elastic element is disposed within the annular sliding cavity. One end of the second elastic element acts on the first stop, and the other end acts on the sliding part, providing a force to the sliding part away from the first stop.

[0027] As a further technical solution, the sliding block also has a beveled part and a rounded corner. The sliding block is configured such that after the collar and the brake roller rotate in opposite directions, and after the sliding block slides out of the groove, the beveled part slides against the side wall of the inner groove.

[0028] As a further technical solution, the collar, the sliding block, the first elastic element, the outer shell and the second elastic element together form a secondary braking assembly. The secondary braking assembly consists of two sets, located on both sides of the brake roller.

[0029] The working principle and beneficial effects of this utility model are as follows:

[0030] In this invention, when braking is required, the first rotating rod swings towards the brake roller. Since the brake pads are oscillating on the first rotating rod, as the rod swings, the brake pads slide against the surface of the brake roller, generating friction and thus achieving primary braking. By using the first rotating rod to drive the brake pads to contact the brake roller, flexible braking operation is achieved, allowing for timely intervention in the braking process according to actual needs. The primary braking setting allows for the application of a certain braking force in advance when the rotating mechanism is rotating at high speed, effectively reducing the rotational speed of the mechanism and lessening the burden on subsequent braking operations. It also reduces the instantaneous wear on the brake pads when directly applying strong braking, extending the service life of the brake pads. Attached Figure Description

[0031] The preferred embodiments will be described below in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.

[0032] Figure 1 This is a schematic diagram of the structure of this utility model;

[0033] Figure 2 This is a schematic diagram of the internal structure of this utility model;

[0034] Figure 3 This is another schematic diagram of the internal structure of this utility model;

[0035] Figure 4 for Figure 3 A magnified schematic diagram of part A in the middle.

[0036] In the diagram: Base-1, Brake Roller-2, Slide Groove-201, Outlet-202, First Rotating Rod-3, Brake Pad-4, Second Rotating Rod-5, Linear Drive Component-6, Transmission Block-7, Support Component-8, First Connecting Rod-9, Collar-10, Secondary Braking Assembly-1000, Inner Slot-1001, Sliding Part-1002, Sliding Block-11, Locking Part-1101, Inclined Part-1102, Rounded Corner Part-1103, First Elastic Component-12, Outer Shell-13, Annular Slide Cavity-1301, First Inner Ring Wall-1302, Second Inner Ring Wall-1303, First Stop-1304, Second Elastic Component-14. Detailed Implementation

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0038] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0039] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0040] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0041] Reference Figures 1-4 An embodiment of this utility model proposes a two-stage braking device for the rotating mechanism of a gantry crane, used to provide braking for the rotating mechanism of the gantry crane, including a base 1; a brake roller 2 rotatably mounted on the base 1, the brake roller 2 being connected to the rotating mechanism in a transmission manner; a first rotating rod 3 with one end swingingly mounted on the base 1, the swing axis of the first rotating rod 3 being parallel to the rotation axis of the brake roller 2; a brake pad 4 swingingly mounted on the first rotating rod 3, the first rotating rod 3 being configured such that after swinging, it approaches or moves away from the brake roller 2, and after swinging towards the brake roller 2, the brake pad 4 slides against the surface of the brake roller 2.

[0042] In this embodiment, when braking is required, the first rotating rod 3 swings towards the brake roller 2. Since the brake pad 4 is oscillatingly mounted on the first rotating rod 3, as the first rotating rod 3 swings, the brake pad 4 slides against the surface of the brake roller 2, generating friction and thus achieving primary braking. By using the first rotating rod 3 to drive the brake pad 4 to contact the brake roller 2, flexible braking operation is achieved, allowing for timely intervention in the braking process according to actual needs. The primary braking setting allows for the application of a certain braking force in advance when the rotating mechanism is rotating at high speed, effectively reducing the rotational speed of the rotating mechanism and lessening the burden on subsequent braking operations. It also reduces the instantaneous wear on the brake pad 4 when directly applying strong braking, extending the service life of the brake pad 4.

[0043] Furthermore, it also includes a second rotating rod 5, one end of which is swaying on the base 1. The first rotating rod 3 and the second rotating rod 5 are respectively located on both sides of the brake roller 2. A brake pad 4 is also swaying on the second rotating rod 5. The first rotating rod 3 and the second rotating rod 5 are configured to move closer to each other or further away after swaying. After moving closer to each other, the brake pads 4 on the first rotating rod 3 and the second rotating rod 5 slide against the surface of the brake roller 2.

[0044] In this embodiment, when the braking operation is initiated, the first rotating rod 3 and the second rotating rod 5 simultaneously swing towards the brake roller 2. As they swing, the brake pads 4 on both the first rotating rod 3 and the second rotating rod 5 slide and abut against the surface of the brake roller 2, applying braking force to the brake roller 2 from both sides simultaneously. The simultaneous action of the first rotating rod 3 and the second rotating rod 5 from both sides increases the contact area between the brake pads 4 and the brake roller 2, improving braking efficiency. Dual-sided braking makes the braking force distribution more uniform, reducing localized wear on the brake roller 2 and extending its service life. It enhances the stability and reliability of braking, enabling more effective braking even under high-speed rotation.

[0045] Furthermore, it also includes a linear drive 6, one end of which is oscillatingly mounted on the base 1; a transmission block 7 is oscillatingly mounted on the output end of the linear drive 6; a support 8 is hinged at one end to the base 1 and at the other end to one end of the transmission block 7; a first connecting rod 9 is hinged at one end to the first rotating rod 3 and at the other end to the transmission block 7; a second rotating rod 5 is also hinged to the transmission block 7, and the hinge point of the first connecting rod 9 and the second rotating rod 5 is located on one side of the hinge point between the transmission block 7 and the linear drive 6, while the hinge point of the support 8 and the transmission block 7 is located on the other side.

[0046] In this embodiment, when braking is required, the linear drive 6 actuates, extending or retracting its output end. This causes the transmission block 7 to oscillate. Due to the hinged relationship between the support 8, the first connecting rod 9, and the second rotating rod 5 and the transmission block 7, the oscillation of the transmission block 7 drives the first rotating rod 3 and the second rotating rod 5 to oscillate simultaneously toward the brake roller 2, causing the brake pad 4 to slide against the surface of the brake roller 2, thus achieving braking. The linear drive 6, through the cooperation of the transmission block 7, the support 8, and the connecting rod, achieves precise synchronous control of the first rotating rod 3 and the second rotating rod 5, ensuring the consistency and stability of braking on both sides. This mechanical transmission structure is simple, reliable, and responsive, enabling effective braking operations in a short time. The support 8 enhances the stability of the transmission structure and reduces shaking and deviation during transmission.

[0047] Furthermore, the brake roller 2 also has a radially oriented groove 201, the groove 201 having an outlet 202, and the end of the outlet 202 located away from the rotation axis of the brake roller 2 further including a collar 10, the collar 10 being coaxially rotatably disposed with the brake roller 2, the inner wall of the collar 10 slidingly abutting against the outer wall of the brake roller 2, the collar 10 having an inner groove 1001, the collar 10 being configured such that, after rotating relative to the brake roller 2, the outlet 202 is connected to or disconnected from the inner groove 1001; the sliding block 11 is slidably disposed within the groove 201, the sliding block 11 having a locking part 1101, the sliding block 11 being configured such that, after the outlet 202 is connected to the inner groove 1001, the locking part 1101 engages with or disengages from the inner groove 1001 after the sliding block 11 slides.

[0048] In this embodiment, during normal operation, since the outlet 202 and the inner slot 1001 are not connected, the locking part 1101 of the sliding block 11 is stably located within the slide groove 201 and does not interact with the inner slot 1001. When the rotation speed of the rotating mechanism is too high, centrifugal force throws part of the sliding block 11 out. When braking is required, the collar 10 rotates relative to the brake roller 2, connecting the outlet 202 with the inner slot 1001. At this time, since the sliding block 11 has been partially thrown out, it slides within the slide groove 201, and the locking part 1101 engages with the inner slot 1001, achieving secondary braking. The interval between the outlet 202 and the inner slot 1001 during normal operation ensures that the braking components will not malfunction in non-braking states, improving the stability and reliability of the system. Connection is only achieved through the rotation of the collar 10 during specific high-speed or braking requirements, triggering secondary braking, thus improving the accuracy and specificity of braking control.

[0049] Furthermore, it also includes a first elastic member 12, one end of which acts on the bottom wall of the slide groove 201 and the other end acts on the sliding block 11, providing a force for the sliding block 11 to approach the bottom wall of the slide groove 201.

[0050] In this embodiment, during normal operation, the first elastic element 12 is in a compressed state, applying a force to the sliding block 11 to bring it close to the bottom wall of the slide groove 201, ensuring that the sliding block 11 is stable within the slide groove 201. When the rotation speed of the rotating mechanism is too high, the centrifugal force overcomes the elastic force of the first elastic element 12, throwing the sliding block 11 partially out. During braking, the collar 10 rotates to connect the outlet 202 with the inner slot 1001. The first elastic element 12 helps the sliding block 11 slide smoothly, allowing the locking part 1101 to engage with the inner slot 1001 to achieve secondary braking. The first elastic element 12 ensures that the sliding block 11 is stable within the slide groove 201 during normal operation, reducing the risk of malfunction and improving the stability and reliability of the system. During braking, the first elastic element 12 helps the sliding block 11 respond quickly and accurately engage with the inner slot 1001, improving the timeliness and accuracy of braking.

[0051] Furthermore, it also includes an outer shell 13, which is disposed on one side of the brake roller 2. The outer shell 13 has an annular sliding cavity 1301, and a collar 10 is rotatably disposed within the annular sliding cavity 1301. The annular sliding cavity 1301 has a first inner ring wall 1302 and a second inner ring wall 1303. The first inner ring wall 1302 is located outside the second inner ring wall 1303. The outer wall of the collar 10 has a sliding portion 1002. The collar 10 is configured such that the inner wall of the collar 10 slides against the second inner ring wall 1303, and after rotation, the sliding portion 1002 slides against the first inner ring wall 1302.

[0052] In this embodiment, during normal operation, the collar 10 rotates smoothly within the annular sliding cavity 1301, with its inner wall sliding against the second inner annular wall 1303. When braking is required, the collar 10 rotates at a certain angle, causing the sliding part 1002 to slide against the first inner annular wall 1302, thus achieving a specific braking action. The annular sliding cavity 1301 of the outer shell 13 provides a precise track and guide for the rotation of the collar 10, ensuring the accuracy and stability of the collar 10's movement. The dual constraint of the first inner annular wall 1302 and the second inner annular wall 1303 effectively prevents the collar 10 from wobbling and deviating during rotation, improving the reliability of braking. The sliding contact between the sliding part 1002 and the first inner annular wall 1302 ensures that the collar 10 can quickly and accurately reach the designated position during braking, enhancing the timeliness and effectiveness of braking. This structural design reduces unnecessary friction between the collar 10 and other components, reduces wear, and extends the service life of the collar 10 and the entire braking device. The outer casing 13 provides good protection for the internal components such as the collar 10, reduces the intrusion and interference of external factors such as dust and impurities, and ensures the normal operation of the braking device.

[0053] Furthermore, the first inner ring wall 1302 has a first stop 1304, and the collar 10 is configured such that after rotation, the sliding portion 1002 approaches or moves away from the first stop 1304.

[0054] In this embodiment, during normal operation, the sliding part 1002 maintains a certain distance from the first stop part 1304. When braking is required, the collar 10 rotates, causing the sliding part 1002 to move closer to or further away from the first stop part 1304, thereby achieving specific braking actions and position control. The first stop part 1304 provides a clear limit position for the rotation of the collar 10, enhancing the accuracy and controllability of the braking operation. It can limit excessive rotation of the collar 10, avoiding braking failure or component damage caused by excessive rotation. Its cooperation with the sliding part 1002 improves the positioning accuracy of the collar 10 during braking, ensuring the stability of the braking effect. This makes the adjustment and maintenance of the braking device more convenient; by observing the relative position of the sliding part 1002 and the first stop part 1304, the working status of the braking device can be quickly determined.

[0055] Furthermore, it also includes a second elastic member 14, which is disposed in the annular sliding cavity 1301. One end of the second elastic member 14 acts on the first stop 1304, and the other end acts on the sliding part 1002, providing a force for the sliding part 1002 to move away from the first stop 1304.

[0056] In this embodiment, under normal conditions, the second elastic member 14 is in a compressed or stretched state, applying a force to the sliding portion 1002 to move it away from the first stop 1304. When braking is required, the collar 10 rotates to overcome the elastic force of the second elastic member 14, causing the sliding portion 1002 to move closer to the first stop 1304. The second elastic member 14 provides a preload force to the sliding portion 1002 of the collar 10 away from the first stop 1304, ensuring the positional stability of the collar 10 during normal operation and reducing the possibility of malfunction. During braking, the collar 10 needs to rotate to overcome the elastic force of the second elastic member 14, making the braking action more reliable and precise, avoiding inaccurate braking due to unexpected factors. It can buffer the impact force when the collar 10 contacts the first stop 1304 during rotation, protecting the components from damage and extending their service life.

[0057] Furthermore, the sliding block 11 also has a beveled portion 1102 and a rounded corner portion 1103. The sliding block 11 is configured such that after the collar 10 rotates in the opposite direction to the brake roller 2, and after the sliding block 11 slides out of the slide groove 201, the beveled portion 1102 slides against the side wall of the inner groove 1001.

[0058] In this embodiment, when the braking operation is completed, the collar 10 rotates in the opposite direction to reset under the action of the second elastic member 14. At this time, the sliding block 11 slides out of the groove 201, and the inclined surface 1102 slides against the side wall of the inner groove 1001, assisting the smooth reset of the collar 10. The sliding contact between the inclined surface 1102 and the side wall of the inner groove 1001 during the reset of the collar 10 effectively reduces the resistance during the reset process, allowing the collar 10 to return to its initial position more smoothly under the action of the second elastic member 14. The rounded corner 1103 further reduces the friction and jamming when the sliding block 11 contacts the inner groove 1001, ensuring the smoothness of the reset action. This design improves the working efficiency of the braking device, reduces the reset time, and allows the gantry crane's rotating mechanism to return to normal operation more quickly.

[0059] Furthermore, the collar 10, the sliding block 11, the first elastic element 12, the outer shell 13 and the second elastic element 14 together form the secondary braking assembly 1000. The secondary braking assembly 1000 consists of two sets, located on both sides of the brake roller 2 respectively.

[0060] In this embodiment, when the gantry crane's rotating mechanism requires braking, the two secondary braking components 1000 on both sides operate simultaneously. The collar 10 rotates, and the sliding block 11, under the action of centrifugal force and other forces, cooperates with the collar 10 to achieve braking. The first elastic element 12 and the second elastic element 14 provide auxiliary functions at their respective positions. The two sets of secondary braking components 1000 are located on both sides of the brake roller 2, making the braking force applied to the brake roller 2 more uniform and balanced during braking, thus improving the stability and reliability of braking. The double-sided design increases the total braking force, enabling more effective handling of high-speed rotation, enhancing the braking effect, and ensuring the safe operation of the equipment. Even if one set of secondary braking components 1000 malfunctions or its performance deteriorates, the other set can still provide a certain braking effect, improving the redundancy and fault tolerance of the entire braking system. The symmetrical distribution structure makes the braking device more evenly stressed during operation, reducing component wear and deformation, and extending the service life of each component.

[0061] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model 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 solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A two-stage braking device for the rotating mechanism of a gantry crane, used to provide braking for the rotating mechanism of the gantry crane, characterized in that, include: Base (1); Brake roller (2), the brake roller (2) is rotatably mounted on the base (1), and the brake roller (2) is connected to the rotating mechanism in a transmission manner; The first rotating rod (3) has one end swinging on the base (1), and the swing axis of the first rotating rod (3) is parallel to the rotation axis of the brake roller (2). Brake pad (4) is oscillatingly mounted on the first rotating rod (3). The first rotating rod (3) is configured to oscillate closer to or further away from the brake roller (2) after oscillating, and after oscillating closer to the brake roller (2), the brake pad (4) slides against the surface of the brake roller (2).

2. The dual-stage braking device for the rotating mechanism of the gantry crane according to claim 1, characterized in that, Also includes: The second rotating rod (5) is swayed at one end on the base (1). The first rotating rod (3) and the second rotating rod (5) are located on both sides of the brake roller (2). The brake pad (4) is also swayed on the second rotating rod (5). The first rotating rod (3) and the second rotating rod (5) are configured to move closer to each other or further away after swaying. After moving closer to each other, the brake pad (4) on the first rotating rod (3) and the second rotating rod (5) slide against the surface of the brake roller (2).

3. The dual-stage braking device for the rotating mechanism of the gantry crane according to claim 2, characterized in that, Also includes: A linear drive unit (6) is oscillatingly mounted on the base (1) at one end; Transmission block (7), which is oscillatingly disposed on the output end of the linear drive (6); Support member (8), one end of which is hinged to the base (1) and the other end is hinged to one end of the transmission block (7); The first connecting rod (9) is hinged at one end to the first rotating rod (3) and at the other end to the transmission block (7). The second rotating rod (5) is also hinged to the transmission block (7). The hinge point of the first connecting rod (9) and the second rotating rod (5) is located on one side of the hinge point between the transmission block (7) and the linear drive member (6), and the hinge point between the support member (8) and the transmission block (7) is located on the other side.

4. The dual-stage braking device for the rotating mechanism of the gantry crane according to claim 1, characterized in that, The brake roller (2) also has a radial groove (201) with an outlet (202). The outlet (202) is located at one end of the groove (201) away from the rotation axis of the brake roller (2), and further includes: A collar (10) is rotatably arranged coaxially with the brake roller (2). The inner wall of the collar (10) slides against the outer wall of the brake roller (2). The collar (10) has an inner groove (1001). The collar (10) is configured such that, after rotating relative to the brake roller (2), the outlet (202) communicates with or is disconnected from the inner groove (1001). A sliding block (11) is slidably disposed in the slide groove (201). The sliding block (11) has a locking part (1101). The sliding block (11) is configured such that after the outlet part (202) communicates with the inner slot (1001), the locking part (1101) locks into or leaves the inner slot (1001) after the sliding block (11) slides.

5. The dual-stage braking device for the rotating mechanism of the gantry crane according to claim 4, characterized in that, Also includes: The first elastic element (12) acts on the bottom wall of the slide groove (201) at one end and on the sliding block (11) at the other end, providing the sliding block (11) with a force close to the bottom wall of the slide groove (201).

6. The dual-stage braking device for the rotating mechanism of a gantry crane according to claim 5, characterized in that, Also includes: The outer shell (13) is disposed on one side of the brake roller (2). The outer shell (13) has an annular sliding cavity (1301). The collar (10) is rotatably disposed in the annular sliding cavity (1301). The annular sliding cavity (1301) has a first inner ring wall (1302) and a second inner ring wall (1303). The first inner ring wall (1302) is located outside the second inner ring wall (1303). The outer wall of the collar (10) has a sliding part (1002). The collar (10) is configured such that the inner wall of the collar (10) slides against the second inner ring wall (1303), and after rotation, the sliding part (1002) slides against the first inner ring wall (1302).

7. The dual-stage braking device for the rotating mechanism of a gantry crane according to claim 6, characterized in that, The first inner ring wall (1302) has a first stop (1304), and the collar (10) is configured such that when rotated, the sliding part (1002) approaches or moves away from the first stop (1304).

8. The dual-stage braking device for the rotating mechanism of a gantry crane according to claim 7, characterized in that, Also includes: The second elastic element (14) is disposed in the annular sliding cavity (1301). One end of the second elastic element (14) acts on the first stop (1304) and the other end acts on the sliding part (1002), providing the sliding part (1002) with a force that moves it away from the first stop (1304).

9. The dual-stage braking device for the rotating mechanism of a gantry crane according to claim 4, characterized in that, The sliding block (11) also has a beveled portion (1102) and a rounded corner portion (1103). The sliding block (11) is configured such that after the collar (10) and the brake roller (2) rotate in opposite directions, and after the sliding block (11) slides out of the groove (201), the beveled portion (1102) slides against the side wall of the inner groove (1001).

10. The dual-stage braking device for the rotating mechanism of a gantry crane according to claim 8, characterized in that, The collar (10), the sliding block (11), the first elastic element (12), the outer shell (13) and the second elastic element (14) together form a secondary braking assembly (1000). The secondary braking assembly (1000) consists of two sets, located on both sides of the brake roller (2).

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