Automatic braking device and method for aviation dining car

Abstract

The invention discloses an automatic braking device and method for an aviation dining car, and is applied to the technical field of aviation dining car braking. A plurality of brake trundle assemblies are evenly and fixedly connected to the bottom of the aviation dining car, and a brake handle assembly used for controlling the brake trundle assemblies to be unlocked is fixedly connected to the top of the aviation dining car. The brake trundle assembly comprises an installation base fixedly connected to the aviation dining car in a locked mode and a wheel fork rotationally connected to the installation base in the horizontal direction, the wheel fork is rotationally connected with a locking disc and a wheel coaxially and fixedly connected to the locking disc, and the wheel fork is rotationally connected with a clamping block. An unlocking assembly is slidably connected to the wheel fork in the vertical direction, and the unlocking assembly is rigidly connected with the brake handle assembly; the automatic locking device has the technical effects that automatic locking can be realized, the safety performance is improved, and the use cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of airline catering car brakes, and in particular to an automatic braking device and method for an airline catering car. Background Art

[0002] With the improvement of economic level, people will choose to take a plane when traveling long distances, and in most cases will choose to eat on the plane. When delivering meals, flight attendants will choose to use meal delivery carts to deliver meals one by one. In order to cope with the turbulence caused by air flow during the flight, most of the current brake devices of meal delivery carts are foot brake devices. When the plane encounters air flow turbulence during flight, people's stability is very poor, and it is inconvenient to use the foot brake, which can easily cause the meal cart to slide and accidentally injure passengers.

[0003] At present, a Chinese utility model with the announcement number CN209003108U discloses a handbrake type passenger aircraft meal delivery vehicle, comprising a meal vehicle body, a fixed rod is installed at the bottom of the meal vehicle body, the other end of the fixed rod is rotatably connected to a movable rod, one side of the bottom end of the movable rod is provided with a brake pad matched with a universal wheel, the other end of the movable rod is fixedly connected to a telescopic rod, one end of the telescopic rod is connected to a first spring, the upper end of the movable rod is connected to a brake line at a side away from the brake pad, a sleeve is sleeved on the outer side of the brake line, the end of the brake line away from the movable adjustment rod is connected to a handbrake handle, and the handbrake handle is rotatably connected to the meal vehicle handle; The existing utility model uses a handbrake instead of a traditional footbrake device to lock the catering cart, thereby avoiding the problem of being unable to brake when the aircraft encounters turbulent airflow. However, on the one hand, the airline catering cart needs to be started and stopped frequently during use, so that the handbrake needs to be controlled to brake or unlock each time it stops or starts, which increases the complexity of operation and there is a possibility of forgetting to brake when braking, thereby affecting the safety of the airline catering cart; on the other hand, the existing utility model achieves the purpose of braking by friction between the brake pad and the universal wheel. After long-term use, the brake pad will be worn, thereby affecting the braking performance, increasing the replacement cost of the brake pad, and needs to be improved. Summary of the invention

[0004] The first purpose of the present invention is to provide an automatic braking device for an airline catering car, which has the advantages of being able to achieve automatic locking, improving safety performance and reducing the cost of use.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: an automatic brake device for an airline catering car, comprising an airline catering car; a plurality of brake caster assemblies are evenly and fixedly connected to the bottom of the airline catering car, a brake handle assembly for controlling the unlocking of the brake caster assembly is fixedly connected to the top of the airline catering car, the brake caster assembly comprises a mounting seat locked and fixedly connected to the airline catering car and a wheel fork rotatably connected to the mounting seat along the horizontal direction, a locking disk and a wheel coaxially fixedly connected to the locking disk are rotatably connected to the wheel fork, a clamping block clamped to the locking disk to limit the rotation of the locking disk is rotatably connected to the wheel fork, an unlocking assembly is slidably connected to the wheel fork along the vertical direction to drive the clamping block to rotate upward or downward to achieve unlocking or locking of the locking disk, and the unlocking assembly is rigidly connected to the brake handle assembly.

[0006] The present invention is further configured as follows: the locking plate is evenly provided with a plurality of snap-in grooves along the circumferential direction; the snap-in block comprises a rotating portion rotatably connected to the wheel fork based on a pin shaft and a snap-in portion protruding and fixedly connected to the rotating portion and used to snap into the snap-in groove; an end of the rotating portion away from the pin shaft is fixedly connected with a lifting and pressing portion cooperating with the unlocking assembly.

[0007] The present invention is further configured as follows: the unlocking assembly includes a sliding hole opened on the wheel fork along the vertical direction and a sliding shaft slidably connected to the sliding hole, a lifting and pressing block is fixedly connected to the bottom of the sliding shaft, a lifting and pressing groove is opened on the lifting and pressing block and cooperates with the lifting and pressing part to drive the clamping block to rotate up and down, a reset spring is sleeved on the sliding shaft and drives the lifting and pressing block to reset, and a rigid pulling rope is fixedly connected to the sliding shaft and is arranged along the vertical direction and connected to the brake handle assembly.

[0008] The present invention is further configured as follows: the brake handle assembly includes a push-pull handle that is locked and fixedly connected to the top of the airline catering vehicle based on a locking stud, and an unlocking block that is slidably connected to the push-pull handle along a vertical direction, the push-pull handle is provided with a sliding groove for the unlocking block to slide, the rigid pulling rope is fixedly connected to the unlocking block, the unlocking block is provided with a through hole for the locking stud to pass through, and the locking stud is sleeved and connected with a first return spring between the unlocking block and the sliding groove.

[0009] The present invention is further configured as follows: a top connection assembly for abutting the unlocking block so that the brake caster assembly is kept in an unlocked state is fixedly connected to the top of the airline catering vehicle, the top connection assembly comprises a fixing seat fixedly connected to the airline catering vehicle and a mounting shaft fixedly connected to the fixing seat, a top connection block for abutting the unlocking block is rotatably connected to the mounting shaft coaxially, and the top connection block is rotatably connected to the mounting shaft based on a segmented adjustment assembly.

[0010] The present invention is further configured as follows: the segmented adjustment assembly includes a plurality of segmented adjustment grooves which are opened on the mounting shaft along the circumferential direction and are in an arc-shaped structure; an adjustment hole is opened in the top connection block; the adjustment hole is provided with a segmented adjustment ball which is movably connected based on a second return spring and is used to snap into the segmented adjustment groove to achieve snap-fitting and fixing the top connection block to the mounting shaft.

[0011] The present invention is further configured as follows: an abutment support block for abutting and supporting the bottom of the unlocking block is symmetrically fixedly connected to the airline catering cart so that a distance is maintained between the unlocking block and the airline catering cart for easy grasping, and an abutment support groove is provided on the abutment support block.

[0012] The present invention is further configured as follows: the rigid pulling ropes of the brake caster assembly on one side of the pushing direction of the airline catering vehicle are intersected and connected on one side of the unlocking block, and the rigid pulling ropes are wired in the airline catering vehicle along the horizontal direction or the vertical direction to ensure that the rigid pulling ropes of several brake caster assemblies have the same lifting distance.

[0013] The present invention is further configured as follows: a rotary bearing is fixedly connected between the mounting seat and the wheel fork.

[0014] The second object of the present invention is to provide an automatic braking method for an airline catering car, which has the advantages of being able to achieve automatic locking, improving safety performance, and reducing the cost of use.

[0015] The above technical objectives of the present invention are achieved through the following technical solutions: an automatic braking method for an airline catering car, using an automatic braking device for an airline catering car as described in the above technical solution; comprising: Step 1: When pushing the airline catering cart, hold the push-pull handle and the unlocking block by hand at the same time to lift the unlocking block upward, and the first return spring is compressed; Step 2: The unlocking block drives the rigid pulling rope to move upward, thereby driving the sliding shaft and the lifting and pressing block to slide upward, the return spring is compressed, and the lifting and pressing groove provided on the lifting and pressing block cooperates with the lifting and pressing part to drive the clamping block to rotate upward on the wheel fork so that the clamping part on the clamping block is separated from the clamping groove, and the locking plate is unlocked so that the wheel can rotate freely; Step 3. When the hand is released, the first return spring returns to drive the unlocking block to reset downward, thereby driving the rigid pulling rope to move downward. At this time, the return spring drives the sliding shaft and the lifting block to move downward and reset, thereby pressing the clamping block to rotate downward. The clamping part on the clamping block enters the clamping groove, thereby limiting the rotation of the locking plate and the wheel, thereby automatically braking.

[0016] In summary, the present invention has the following beneficial effects: 1. The brake caster assembly is provided with a locking plate and a clamping block for clamping the locking plate on the wheel fork, and a unlocking assembly that is slidably connected to the clamping block in the vertical direction on the wheel fork to drive the unlocking assembly to rotate upward or downward. The unlocking assembly is provided with a lifting block on the sliding shaft and a connecting reset spring on the sliding shaft, and a rigid lifting rope connected to the brake handle assembly is fixedly provided on the sliding shaft. At the same time, a brake handle assembly is fixedly provided on the top of the airline catering vehicle. The brake handle assembly is provided with a push-pull handle and an unlocking block slidably connected in the push-pull handle, and the rigid lifting rope is fixedly connected to the unlocking block. When the airline catering vehicle is pushed, the push-pull handle and the unlocking block are held by hand at the same time to lift the unlocking block and the rigid lifting rope upward, and the rigid lifting rope drives the sliding shaft and the lifting block to slide upward, and the lifting and pressing block provided on the lifting block The groove cooperates with the lifting and pressing part to drive the clamping block to rotate upward on the wheel fork so that the clamping part on the clamping block is separated from the clamping groove, and the locking disk is unlocked so that the wheel can rotate freely. When the hand releases the brake handle, the first return spring returns to drive the unlocking block to reset downward, thereby driving the rigid pull rope to move downward. At this time, the return spring drives the sliding shaft and the lifting and pressing block to move downward and reset, thereby pressing the clamping block to rotate downward, and the clamping part on the clamping block enters the clamping groove to limit the rotation of the locking disk and the wheel, thereby automatically braking. In this way, automatic braking is achieved when the hand is separated from the brake handle assembly, and automatic unlocking is achieved when the brake handle assembly is held. The operation is convenient, avoiding the need to control the handbrake to brake or unlock every time stopping or starting, and also avoiding the possibility of forgetting to brake, thereby ensuring the safety of the airline catering car; 2. The clamping portion of the clamping block is clamped into the clamping groove on the locking disk to limit the rotation of the locking disk and the wheel, avoiding the problem of reduced braking performance due to long-term wear of the brake pads in the traditional way. There is no need to replace the brake pads, which reduces the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of this embodiment; Figure 2 is a schematic structural diagram of the brake caster assembly of this embodiment; Figure 3 is a structural cross-sectional view of the brake caster assembly of this embodiment; Figure 4 is a schematic structural diagram of the brake handle assembly and the top connection assembly of this embodiment; Figure 5 is a structural cross-sectional view of the brake caster assembly of this embodiment; Figure 6 It is a structural cross-sectional view of the top connection assembly of this embodiment.

[0018] Figure numerals: 1, airline catering car; 2, brake caster assembly; 21, mounting seat; 22, wheel fork; 23, locking plate; 24, wheel; 25, clamping block; 251, pin shaft; 252, rotating part; 253, clamping part; 254, lifting and pressing part; 26, unlocking assembly; 261, sliding hole; 262, sliding shaft; 263, lifting and pressing block; 264, lifting and pressing groove; 265, return spring; 266, rigid lifting rope; 27, rotating bearing; 2 8. Card-joining groove; 3. Brake handle assembly; 31. Locking stud; 32. Push-pull handle; 33. Unlocking block; 34. Sliding groove; 35. Through hole; 36. First return spring; 4. Top-joining assembly; 41. Fixed seat; 42. Mounting shaft; 43. Top-joining block; 44. Segmented adjustment assembly; 45. Segmented adjustment groove; 46. Adjustment hole; 47. Second return spring; 48. Segmented adjustment ball; 49. Abutment support block; 410. Abutment support groove. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0020] Embodiment 1: refer to Figures 1 to 6An automatic brake device for an airline catering vehicle comprises an airline catering vehicle 1, a plurality of brake caster assemblies 2 are evenly and fixedly connected at the bottom of the airline catering vehicle 1, a brake handle assembly 3 for controlling the unlocking of the brake caster assembly 2 is fixedly connected at the top of the airline catering vehicle 1, the brake caster assembly 2 is unlocked by holding the brake handle assembly 3 by hand so that the airline catering vehicle 1 can be pushed, when the airline catering vehicle 1 stops, the hand is separated from the brake handle assembly 3, at which time the brake caster assembly 2 is automatically locked to prevent the airline catering vehicle 1 from moving, the brake caster assembly 2 comprises a mounting seat 21 locked and fixedly connected to the airline catering vehicle 1 and a wheel fork 22 connected to the mounting seat 21 in a horizontal direction, between the mounting seat 21 and the wheel fork 22 A rotating bearing 27 is fixedly connected to make the wheel fork 22 rotate more smoothly. A locking disc 23 and a wheel 24 coaxially fixedly connected to the locking disc 23 are rotatably connected to the wheel fork 22. The wheel 24 can be directly fixed to the locking disc 23 based on a fixing pin or a locking screw, so as to move synchronously with the locking disc 23. A clamping block 25 that clamps the locking disc 23 to limit the rotation of the locking disc 23 is rotatably connected to the wheel fork 22. An unlocking assembly 26 that drives the clamping block 25 to rotate upward or downward to unlock or lock the locking disc 23 is also slidably connected to the wheel fork 22 along the vertical direction. The unlocking assembly 26 is rigidly connected to the brake handle assembly 3 to directly control the braking or unlocking of the brake caster assembly 2. In this embodiment, the brake caster assembly 2 is provided with 4 groups and is evenly arranged in a square shape at the bottom of the airline catering car 1.

[0021] refer to Figure 2 and Figure 3Specifically, the locking plate 23 is evenly provided with a plurality of snap-in grooves 28 along the circumferential direction. The snap-in block 25 includes a rotating portion 252 rotatably connected to the fork 22 based on the pin shaft 251 and a snap-in portion 253 protruding and fixedly connected to the rotating portion 252 and used to snap into the snap-in groove 28. A lifting and pressing portion 254 cooperating with the unlocking assembly 26 is fixedly connected to the end of the rotating portion 252 away from the pin shaft 251. The unlocking assembly 26 includes a sliding hole 261 provided on the wheel fork 22 along the vertical direction and a sliding shaft 262 slidably connected to the sliding hole 261, a lifting block 263 is fixedly connected to the bottom of the sliding shaft 262, a lifting groove 264 is provided on the lifting block 263 to cooperate with the lifting portion 254 to drive the clamping block 25 to rotate up and down, a reset spring 265 is sleeved on the sliding shaft 262 to drive the lifting block 263 to reset, and a rigid pull rope 266 provided along the vertical direction and connected to the brake handle assembly 3 is fixedly connected to the sliding shaft 262. When unlocking, the rigid pull rope 266 lifts the sliding shaft 262 upward to drive the sliding shaft 262 to The lifting and pressing block 263 slides upward, the return spring 265 is compressed, and the lifting and pressing groove 264 provided on the lifting and pressing block 263 cooperates with the lifting and pressing portion 254 to drive the clamping block 25 to rotate upward on the wheel fork 22 so that the clamping portion 253 on the clamping block 25 disengages from the clamping groove 28, and the locking disk 23 is unlocked so that the wheel 24 can rotate freely. When the rigid lifting rope 266 loses the lifting force, the return spring 265 resets and drives the sliding shaft 262 and the lifting and pressing block 263 to move downward and reset, thereby pressing the clamping block 25 to rotate downward, and the clamping portion 253 on the clamping block 25 enters the clamping groove 28, thereby limiting the rotation of the locking disk 23 and the wheel 24, thereby automatically braking.

[0022] refer to Figure 4 and Figure 5 Specifically, the brake handle assembly 3 includes a push-pull handle 32 that is locked and fixedly connected to the top of the airline catering car 1 based on a locking stud 31, and an unlocking block 33 that is slidably connected to the push-pull handle 32 along the vertical direction. A sliding groove 34 for the unlocking block 33 to slide is provided on the push-pull handle 32. The rigid pull rope 266 is fixedly connected to the unlocking block 33. A through hole 35 for the locking stud 31 to pass through is provided on the unlocking block 33. A first return spring 3 is sleeved and connected between the locking stud 31 and the unlocking block 33 and the sliding groove 34. 6. When the airline catering cart 1 needs to be pushed, the push-pull handle 32 and the unlocking block 33 are held by the hands at the same time. The unlocking block 33 slides upward into the sliding groove 34 and compresses the first return spring 36. The unlocking block 33 moves upward to drive the rigid pull rope 266 to move upward, thereby unlocking the brake caster assembly 2. When the hand is released from the push-pull handle 32 and the unlocking block 33, the first return spring 36 returns to drive the unlocking block 33 to slide downward to achieve reset. At this time, the rigid pull rope 266 moves downward synchronously, thereby automatically braking the brake caster assembly 2.

[0023] refer to Figure 4 and Figure 6 Specifically, a top connection assembly 4 for top-connecting the unlocking block 33 is fixedly connected to the top of the airline catering vehicle 1 so that the brake caster assembly 2 is kept in an unlocked state. The top connection assembly 4 includes a fixed seat 41 fixedly connected to the airline catering vehicle 1 and a mounting shaft 42 fixedly connected to the fixed seat 41. A top connection block 43 for top-connecting the unlocking block 33 is rotatably connected to the mounting shaft 42 coaxially. The top connection block 43 is rotatably connected to the mounting shaft based on a segmented adjustment assembly 44. The segmented adjustment assembly 44 includes a plurality of segmented adjustment grooves 45 that are arranged on the mounting shaft 42 along the circumferential direction and are in an arc-shaped structure. A The adjustment hole 46 is movably connected with a segmented adjustment ball 48 in the adjustment hole 46 for snapping into the segmented adjustment groove 45 so as to snap and fix the top block 43 to the mounting shaft 42. The segmented adjustment ball 48 cooperates with different segmented adjustment grooves 45 so that the top block can be stably maintained at different angles. When in a stable airspace, in order to avoid the need to hold the push-pull handle 32 and the unlocking block 33 at the same time every time, the top block 43 can be rotated to support the bottom of the unlocking block 33 so that the brake caster assembly 2 is always maintained in the unlocked state, thereby improving the comfort of use. Abutment support blocks 49 are symmetrically fixedly connected to the airline catering cart 1 for abutting and supporting the bottom of the unlocking block 33 so that the unlocking block 33 maintains a distance from the airline catering cart 1 for easy grasping. Abutment support grooves 410 are provided on the abutment support blocks 49. The abutment support blocks 49 are provided so that the unlocking block 33 maintains a distance from the airline catering cart 1, thereby facilitating the hand to reach into the gap between the unlocking block 33 and the airline catering cart 1 for easy grasping of the push-pull handle 32 and the unlocking block 33, avoiding the need to use the hand to pull the unlocking block 33 to achieve unlocking, thereby improving the comfort of operation.

[0024] refer to Figure 1 Specifically, the rigid pulling rope 266 of the brake caster assembly 2 on one side of the pushing direction of the airline catering cart 1 intersects and is connected on one side of the unlocking block 33, and the rigid pulling rope 266 is wired in the airline catering cart 1 along the horizontal direction or the vertical direction to ensure that the rigid pulling ropes 266 of several brake caster assemblies 2 have the same lifting distance, thereby ensuring that the states of several brake caster assemblies 2 remain the same.

[0025] Embodiment 2: An automatic braking method for an airline catering vehicle 1, using an automatic braking device for an airline catering vehicle as shown in Example 1, comprises: Step 1: When pushing the airline catering cart 1, hold the push-pull handle 32 and the unlocking block 33 by hand at the same time to lift the unlocking block 33 upward, and the first return spring 36 is compressed; Step 2: The unlocking block 33 drives the rigid pulling rope 266 to move upward, thereby driving the sliding shaft 262 and the lifting and pressing block 263 to slide upward, the return spring 265 is compressed, and the lifting and pressing groove 264 provided on the lifting and pressing block 263 cooperates with the lifting and pressing portion 254 to drive the clamping block 25 to rotate upward on the wheel fork 22 so that the clamping portion 253 on the clamping block 25 is separated from the clamping groove 28, and the locking plate 23 is unlocked so that the wheel 24 can rotate freely; Step 3. When the hand is released, the first return spring 36 returns to drive the unlocking block 33 to return to its original position, thereby driving the rigid pulling rope 266 to move downward. At this time, the return spring 265 drives the sliding shaft 262 and the lifting block 263 to move downward and return to its original position, thereby pressing the clamping block 25 to rotate downward. The clamping portion 253 on the clamping block 25 enters the clamping groove 28, thereby limiting the rotation of the locking disk 23 and the wheel 24, thereby automatically braking.

[0026] This specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. After reading this specification, those skilled in the art can make creative modifications to this embodiment as needed, but as long as it is within the scope of the claims of the present invention, it will be protected by the patent law.

Claims

1. An automatic braking device for an airline catering vehicle, comprising an airline catering vehicle (1); characterized in that: The bottom of the airline catering vehicle (1) is evenly and fixedly connected with a plurality of brake caster assemblies (2); the top of the airline catering vehicle (1) is fixedly connected with a brake handle assembly (3) for controlling the unlocking of the brake caster assembly (2); the brake caster assembly (2) comprises a mounting seat (21) fixedly connected to the airline catering vehicle (1) and a wheel fork (22) connected to the mounting seat (21) in a horizontal direction; the wheel fork (22) is connected to a locking plate (23) and a locking plate (24) connected to the wheel fork (22) in a horizontal direction; A wheel (24) is axle-fixedly connected to the locking plate (23); a clamping block (25) is rotatably connected to the wheel fork (22) and clamps the locking plate (23) to limit the rotation of the locking plate (23); an unlocking component (26) is slidably connected to the wheel fork (22) along the vertical direction and drives the clamping block (25) to rotate upward or downward to unlock or lock the locking plate (23); the unlocking component (26) is rigidly connected to the brake handle component (3).

2. The automatic brake device for an airline catering vehicle according to claim 1, characterized in that: The locking plate (23) is evenly provided with a plurality of engaging grooves (28) along the circumferential direction. The engaging block (25) comprises a rotating portion (252) rotatably connected to the wheel fork (22) based on a pin shaft (251) and an engaging portion (253) protruding and fixedly connected to the rotating portion (252) and used for engaging with the engaging groove (28). One end of the rotating portion (252) away from the pin shaft (251) is fixedly connected with a lifting and pressing portion (254) cooperating with the unlocking component (26).

3. The automatic brake device for an airline catering vehicle according to claim 2, characterized in that: The unlocking assembly (26) includes a sliding hole (261) provided on the wheel fork (22) along the vertical direction and a sliding shaft (262) slidably connected to the sliding hole (261); a lifting block (263) is fixedly connected to the bottom of the sliding shaft (262); a lifting groove (264) is provided on the lifting block (263) for cooperating with the lifting portion (254) to drive the clamping block (25) to rotate up and down; a reset spring (265) is sleeved on the sliding shaft (262) for driving the lifting block (263) to reset; and a rigid pulling rope (266) is fixedly connected to the sliding shaft (262) and is arranged along the vertical direction and connected to the brake handle assembly (3).

4. The automatic brake device for an airline catering vehicle according to claim 3, characterized in that: The brake handle assembly (3) comprises a push-pull handle (32) which is locked and fixedly connected to the top of the airline catering vehicle (1) based on a locking stud (31) and an unlocking block (33) which is slidably connected to the push-pull handle (32) along the vertical direction, the push-pull handle (32) is provided with a sliding groove (34) for the unlocking block (33) to slide, the rigid pulling rope (266) is fixedly connected to the unlocking block (33), the unlocking block (33) is provided with a through hole (35) for the locking stud (31) to pass through, and the locking stud (31) is sleeved and connected with a first return spring (36) between the unlocking block (33) and the sliding groove (34).

5. The automatic brake device for an airline catering vehicle according to claim 4, characterized in that: The top of the airline catering vehicle (1) is fixedly connected with a top connection assembly (4) for abutting the unlocking block (33) so that the brake caster assembly (2) is kept in an unlocked state. The top connection assembly (4) comprises a fixing seat (41) fixedly connected to the airline catering vehicle (1) and a mounting shaft (42) fixedly connected to the fixing seat (41). A top connection block (43) for abutting the unlocking block (33) is rotatably connected to the mounting shaft (42) coaxially. The top connection block (43) is rotatably connected to the mounting shaft (42) based on a segmented adjustment assembly (44).

6. The automatic brake device for an airline catering vehicle according to claim 5, characterized in that: The segmented adjustment component (44) comprises a plurality of segmented adjustment grooves (45) which are arranged on the mounting shaft (42) along the circumferential direction and are in an arc-shaped structure. An adjustment hole (46) is arranged in the top connection block (43). A segmented adjustment ball (48) is movably connected in the adjustment hole (46) based on a second return spring (47) and is used to snap into the segmented adjustment groove (45) so as to snap and fix the top connection block (43) to the mounting shaft (42).

7. The automatic brake device for an airline catering vehicle according to claim 4, characterized in that: The airline catering cart (1) is symmetrically fixedly connected with an abutment support block (49) for abutting and supporting the bottom of the unlocking block (33) so that a distance is maintained between the unlocking block (33) and the airline catering cart (1) for easy grasping, and an abutment support groove (410) is provided on the abutment support block (49).

8. The automatic brake device for an airline catering vehicle according to claim 4, characterized in that: The rigid pull rope (266) of the brake caster assembly (2) on one side of the pushing direction of the airline catering vehicle (1) is connected to one side of the unlocking block (33), and the rigid pull rope (266) is wired in the airline catering vehicle (1) along the horizontal direction or the vertical direction to ensure that the rigid pull ropes (266) of several brake caster assemblies (2) have the same lifting distance.

9. The automatic brake device for an airline catering vehicle according to claim 1, characterized in that: A rotary bearing (27) is fixedly connected between the mounting seat (21) and the wheel fork (22).

10. An automatic braking method for an airline catering vehicle (1), using an automatic braking device for an airline catering vehicle as claimed in claim 4; characterized in that: include: Step 1: When pushing the airline catering cart (1), the push-pull handle (32) and the unlocking block (33) are held by hand at the same time to lift the unlocking block (33) upward, and the first return spring (36) is compressed; Step 2, the unlocking block (33) drives the rigid pulling rope (266) to move upward, thereby driving the sliding shaft (262) and the lifting and pressing block (263) to slide upward, the return spring (265) is compressed, and the lifting and pressing groove (264) provided on the lifting and pressing block (263) cooperates with the lifting and pressing part to drive the clamping block (25) to rotate upward on the wheel fork (22) so that the clamping part (253) on the clamping block (25) is disengaged from the clamping groove (28), and the locking plate (23) is unlocked so that the wheel (24) can rotate freely; Step 3. When the hand is released, the first return spring (36) returns to drive the unlocking block (33) to return downward, thereby driving the rigid pulling rope (266) to move downward. At this time, the return spring (265) drives the sliding shaft (262) and the lifting block (263) to move downward and return, thereby pressing the clamping block (25) to rotate downward. The clamping part (253) on the clamping block (25) enters the clamping groove (28) to limit the rotation of the locking disk (23) and the wheel (24), thereby automatically braking.

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