A rotary cutting type automatic chestnut incision device

Abstract

The present invention relates to the technical field of fruit processing, and in particular to the incision processing technology of chestnuts, and discloses a rotary cutting type automatic chestnut incision device. The automatic chestnut incision device comprises a frame-type carrier, a power input device on one side of the frame, a moving and stopping device at the bottom of the frame, a feeding device at the top of the frame, a flipping and conveying device below the feeding device, a cutting device at the front of the conveying device, and a collecting device connected to the box body at the front of the cutting device. The feeding device can send the chestnuts to be processed in batches and rows from the square hopper above, and slide them along the dustpan-shaped slideway to the flipping and conveying device; the flipping and conveying device can flip the chestnuts and arrange them into several rows and enter the corresponding incision device of each row; the incision device can imitate the convex surface of the chestnut and perform equal-depth incision processing; after processing, each group of chestnuts enters the collecting device for unified collection. The present invention replaces the manual incision work of chestnuts, greatly saving manpower and reducing work risks.

Description

Technical Field

[0001] This invention patent relates to the technical field of forest and fruit processing machinery, especially the incision processing technology of chestnuts. Specifically, it is a rotary cutting type automatic chestnut incision device. Background Art

[0002] Chestnuts are native to China and are one of the well-known nuts that have been consumed earliest in China. The annual output ranks first in the world. Chinese chestnuts are of excellent quality and rich in nutrition. After being stir-fried, their meat is fine and sweet, and it is called "sugar-fried chestnuts". "Sugar-fried chestnuts" is a famous traditional snack with local flavor in the areas of Beijing and Tianjin, and it is also a delicious food with a long tradition, deeply loved by people. Before stir-frying chestnuts, it is usually necessary to make an incision on the outer shell of the chestnuts so that the chestnuts can be flavored during stir-frying. And the incision on the outer shell of the chestnuts will crack as the temperature rises during stir-frying, which is convenient for people to peel and eat.

[0003] Currently, the main way to make an opening on the outer shell of chestnuts is to use a knife held by hand to make a cut. The outer shell of raw chestnuts is hard, and it is difficult and dangerous to process the incision on the outer shell of chestnuts manually. The production efficiency is low during large-scale processing, and safety accidents are likely to occur.

[0004] In the prior art, there is a chestnut incision machine with the application number 201910060602.9 and the application date January 22, 2019. The specific implementation method of this chestnut incision machine is as follows: Chestnuts enter a separate feeding trough by a conveying mechanism and move to the opening device along with the feeding trough. The opening device is mainly composed of a link mechanism. It is necessary to manually pull the transmission handle to operate the mechanism to drive the knife to make a vertical extrusion incision on each chestnut in the processing trough one by one, and complete the opening operation by observing the opening depth with the naked eye.

[0005] This chestnut incision machine needs to rely on manual operation of the equipment and observation with the naked eye for processing. This method has low production efficiency and is difficult to be widely promoted and used. And through on-site research, it is known that when manually making an incision on chestnuts, the convex surface of the chestnuts will be selectively incised to ensure the appearance and facilitate the cracking of chestnuts during stir-frying. However, the existing chestnut incision machine in the feeding trough cannot distinguish which side of the chestnut is facing up for incision, and the extrusion incision method may cause damage to the chestnuts and cannot guarantee the appearance of the processed chestnuts.

[0006] In summary, there are obvious defects in the prior art in practical applications. Therefore, it is necessary to develop a device that can automatically process incisions on a large number of chestnuts and still ensure the appearance of the chestnuts after incision processing. Summary of the Invention

[0007] The purpose of the present invention is to provide a rotary cutting type automatic chestnut incision device for the existing technical problems, which can be applied to a large number of chestnuts for efficient incision processing and can ensure high-quality appearance of the processed chestnuts.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] A rotary cutting type automatic chestnut cutting equipment includes a frame-type carrier, a power input device on one side of the frame, a moving and stopping device at the bottom of the frame, a feeding device at the top of the frame, a flipping and conveying device below the feeding device, a cutting device at the front of the conveying device, and a collecting device connected to the box at the front of the cutting device.

[0010] The automatic cutting process of the equipment of the present invention starts from the feeding device, passes through the turning and conveying device, the cutting device, and ends at the collecting device.

[0011] It is further explained that the main body of the feeding device is composed of a special trough-shaped conveyor belt with a square hopper on the top; the bottom of the square hopper is open and not connected to the conveyor belt. After the chestnuts to be processed enter the hopper, they move forward with the conveyor belt, and after encountering the obstruction of the front wall of the square hopper, they fall into the single-row long trough on the conveyor belt and leave the hopper with the conveyor belt; the single-row long trough drives the chestnuts to be processed to the front end of the conveyor belt, and naturally falls into the dustpan-shaped slide below the front end of the conveyor belt, and slides with the slide at a certain relative speed to the turning and transportation device below.

[0012] It is further explained that the flipping and transporting device is composed of a belt-type conveyor. After the chestnuts to be processed slide onto the moving conveyor at a certain relative speed, the friction generated between the chestnut shell and the conveyor belt will form an overturning moment on the center of gravity of the chestnut, causing the chestnut to flip over with the convex surface facing upward and move forward with the conveyor belt; after the chestnuts to be processed on the conveyor belt pass through the guide groove connected to the frame, they are arranged in several rows and enter each group of incision devices one after another for simultaneous incision processing.

[0013] Further explanation, taking a group of incision devices as an example, the incision device is composed of two groups of front and rear pressure rollers, each group of pressure rollers is composed of two symmetrical left and right pressure rollers with a certain distance between them, and the position of the rear group of pressure rollers is fixed and slightly higher than the front group; after the chestnuts to be processed are transported to the bottom of the rear group of pressure rollers, they will continue to move forward to the front group of pressure rollers under the clamping of the pressure roller belt and the conveyor belt; a knife holder is clamped between the left and right pressure rollers of the front group of pressure rollers and is fixedly connected to the wheel axle, and the wheel axle is limited to the frame by a spring, and a serrated circular blade is arranged on the knife holder, and the gear on the blade rotating shaft is meshed with the inner gear ring of the pressure roller through the reversing gear on the knife holder, so that the circular blade and the pressure roller are reversed, and the circular blade extends out of the gap between the left and right pressure rollers by about 1mm; in addition, the front group of pressure rollers and the knife holder fixedly connected to the wheel axle can float up and down with the wheel axle under the action of the spring, so as to achieve the purpose of profiling the convex surface of the chestnut and performing equal-depth incision processing; after the incision processing, the chestnuts enter the collecting device.

[0014] Further explanation: The collection device is composed of an integrated chute connected to the frame and is located below each group of incision devices. After being processed by the incision devices, each group of chestnuts naturally fall onto the chute and slide towards the unified outlet. In addition, during the process of chestnuts leaving the incision devices and falling onto the chute, the infrared sensors arranged along the way can count each chestnut one by one, facilitating subsequent batch collection.

[0015] In addition, the power input device on one side of the frame is composed of a motor, a reducer, a reverse gear, and a synchronous belt. After being connected by the reducer, the motor transmits power to the conveyor belt drive shaft in the flipping and transporting device. The conveyor belt drive shaft is connected to the reverse gear through the synchronous belt and then connected to the rear pressure pulley shaft in the incision device, enabling the upper side of the conveyor belt and the lower side of the pressure pulley belt to move at the same speed in the same direction, ensuring more stable belt clamping of chestnuts during the incision process. At the same time, the conveyor belt driven shaft and the conveyor belt drive shaft are connected by a speed ratio belt to ensure the conveyor belt and the conveyor move at a certain speed relationship.

[0016] In addition, the main body of the moving and parking device at the bottom of the frame is composed of universal wheels. There is a knob on the side of the wheel connected to a worm and gear mechanism and a screw lift rod inside, which can control the internal parking rod to extend from the opening at the bottom of the wheel to support on the ground, facilitating the horizontal fixation and normal operation of the machine on uneven ground.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] (1) The chestnut incision equipment provided by the present invention is easy to operate. Just put a batch of chestnuts to be processed into the hopper of the feeding device, and the equipment can automatically process and transport them to the collection device for unified collection, fully realizing the automation of chestnut incision processing, greatly saving manpower and reducing work risks.

[0019] (2) The chestnut incision equipment provided by the present invention can flip the chestnuts to make the convex surface face upwards and perform incision processing with equal depth on the convex surface by designing the flipping and transporting device and the incision device, ensuring high-quality appearance of the chestnuts after incision processing and being more popular among users.

[0020] (3) The present invention designs the cutting blades of the incision device, making the cutting blades and the pressure pulley rotate in reverse, making it easier to rotate and cut the chestnut shell, and ensuring that the incision of the chestnut shell will not get stuck on the blade, improving the smoothness of the incision operation of the equipment.

[0021] (4) The chestnut incision equipment provided by the present invention can add multiple groups of incision devices according to actual usage conditions, and can realize simultaneous processing of multiple groups of incision devices, so as to process a large number of chestnuts according to different requirements, improving work efficiency.

[0022] (5) The chestnut cutting equipment provided by the present invention can be equipped with an infrared sensor at the collection device to count the finished products one by one, which is convenient for analyzing and adjusting the processing rate and collecting the processed chestnuts in batches according to quantity, thereby realizing intelligent processing.

[0023] (6) The chestnut cutting equipment provided by the present invention is designed with a bottom moving and stopping device. By setting universal wheels, the equipment is easy to transport and move. By setting a retractable stopping rod, it is ensured that the equipment can remain horizontally fixed and work normally on uneven ground, thereby improving the adaptability of the equipment to different environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is an overall isometric view of the present invention.

[0025] Figure 2 It is a full cross-sectional view of the main view of the present invention.

[0026] Figure 3 It is a left side view of the present invention.

[0027] Figure 4 It is a partial axonometric view of the incision device in the present invention.

[0028] Figure 5 It is a partial enlarged view of the power input device in the present invention.

[0029] Figure 6 It is a partial axonometric diagram of the moving and stopping device in the present invention.

[0030] The following are the descriptions of the figures:

[0031] 1 frame carrier; 2-1 square hopper; 2-2 trough conveyor belt; 2-3 dustpan-shaped slideway; 2-4 conveyor belt driving shaft; 3-1 conveyor belt; 3-2 conveyor belt driven shaft; 3-3 guide groove; 3-4 conveyor belt driving shaft; 4-1 pressure pulley belt; 4-2 front pressure pulley; 4-3 front pressure pulley shaft; 4-4 rear pressure pulley; 4-5 rear pressure pulley shaft; 4-6 spring; 4-7 sawtooth circular blade; 4-8 blade reversing gear; 4-9 blade gear shaft; 4-10 tool holder; 4-11 tool holder fixing pin; 5-1 inclined slot; 5-2 infrared sensor; 6-1 motor; 6-2 bevel gear reducer; 6-3 pressure pulley reversing gear; 6-4 rear wheel shaft gear; 6-5 synchronous wheel belt; 6-6 speed matching belt; 7-1 wheel body; 7-2 worm gear; 7-3 rotating shaft; 7-4 worm; 7-5 knob; 7-6 rotating parking rod; 7-7 universal wheel inner sleeve; 7-8 universal wheel outer sleeve; 7-9 wheel axle; 7-10 universal wheel. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiment described here is only a preferred embodiment of the present invention, which is only used to explain the present invention and is not used to limit the present invention.

[0033] See also Figure 1 As shown, the present invention provides a rotary cutting type automatic chestnut cutting equipment, including a frame carrier 1, a feeding device 2 located on the frame carrier 1, a flipping and conveying device 3 located below the feeding device 2, a cutting device 4 located in front of the conveying device 3, a collecting device 5 located below the cutting device 4, a power input device 6 located on one side of the frame carrier 1, and a moving and parking device 7 located at the bottom of the frame carrier 1.

[0034] Taking the specific working process of the device of the present invention as an example, the working principle of the present invention is as follows:

[0035] When a batch of chestnuts to be processed need to be cut, the chestnuts to be processed are placed in a square hopper 2-1, the bottom of which is open and a trough-shaped conveyor belt 2-2 (such as the attached Figure 2 ), after the chestnuts to be processed enter the square hopper 2-1, they move forward together with the trough conveyor belt 2-2. When the chestnuts encounter the obstruction of the front wall of the square hopper 2-1, they fall into the trough on the trough conveyor belt 2-2 and leave from the bottom of the square hopper 2-1 with the movement of the trough; after the chestnuts to be processed move to the front end of the trough conveyor belt 2-2, they naturally fall onto the dustpan-shaped slide 2-3 below the trough conveyor belt, so that the chestnuts slide at a certain speed to the turning and transportation device 3 below.

[0036] Further, when the chestnuts to be processed slide onto the conveyor belt 3-1 (such as attached Figure 2 ), since the contact surface has a certain relative speed, the friction force generated by the contact surface forms an overturning moment on the center of gravity of the chestnuts, causing the chestnuts to flip over to the convex surface facing upward, and after stabilization, they move forward with the conveyor belt 3-1; when the chestnuts pass through the guide groove 3-3, they are guided by the guide groove 3-3 and arranged in several rows (3 rows in the figure) and enter the corresponding incision devices 4 of each group (3 groups in the figure).

[0037] Further, after the processed chestnuts reach the cutting device 4, they pass under the left and right rear pressure belt wheels 4-4 and the left and right front pressure belt wheels 4-2 (see Figure 2) The rear pinch roller 4-4 is connected to the rear pinch roller shaft 4-5, and the front pinch roller 4-2 is connected to the front pinch roller shaft 4-3. The front and rear pinch rollers are connected by a pinch roller belt 4-1. The rear pinch roller 4-4 drives the front pinch roller 4-2 to rotate, and the position of the rear pinch roller 4-4 is slightly higher than that of the front pinch roller 4-2, allowing the chestnuts to be processed to enter unobstructed from below. After the chestnuts to be processed enter the rear pinch roller 4-4, the gap gradually becomes narrower, and under the clamping action of the pinch roller belt 4-1 and the conveyor belt 3-1, they continue to move forward and are cut under the front pinch roller 4-2.

[0038] Further, referring to Figure 3 Figure 4 , the left and right front pinch rollers 4-2 are symmetrically distributed, and a cutting device (4-7 to 4-11) is arranged in the middle. The serrated-edge circular blade 4-7 extends out from the gap between the two pinch rollers (about 1 mm) and is connected to the tool holder 4-10 through the blade gear shaft 4-9. The blade gear shaft 4-9 meshes with the inner gear ring of the front pinch roller 4-2 through the blade reverse gear 4-8 on the tool holder 4-10, so that the front pinch roller 4-2 can drive the serrated-edge circular blade 4-7 to rotate in reverse when rotating actively. At this time, the chestnuts to be processed are clamped by the two belts (3-1, 4-1) and pass under the front pinch roller 4-2. The serrated-edge circular blade 4-7 moving in the opposite direction to the rotation direction of the front pinch roller 4-2 has relative movement with the chestnuts, and the outer shell of the chestnuts can be cut by rotation. Preferably, the tool holder 4-10 is fixedly connected to the front pinch roller shaft 4-3 by the tool holder fixing pin 4-11. The front pinch roller shaft 4-3 is restricted on the frame 1 by the spring 4-6, which can drive the front pinch roller 4-2 and the cutting device as a whole to float up and down, ensuring that the extending distance of the serrated-edge circular blade 4-7 through the gap between the two pinch rollers remains unchanged. When the chestnuts to be processed pass under the front pinch roller 4-2, the front pinch roller 4-2 squeezes the outer shell of the chestnuts and rotates and cuts while floating up and down elastically, achieving the purpose of profiling the convex surface of the chestnuts and performing equal-depth cutting.

[0039] Further, after the chestnuts are cut, they naturally fall into the collection device 5 (refer to Figure 1 and Figure 2 ). The collection device 5 is composed of an inclined chute 5-1 connected to the frame 1. After being processed by each group of cutting devices 4, the chestnuts fall onto the inclined chute 5-1 and slide along the inclined chute 5-1 to a unified outlet and are collected uniformly into an external container (not shown in the figure). Preferably, an infrared sensor 5-2 is arranged below each group of cutting devices 4, which can count the chestnuts after processing one by one, and can realize the batch-by-batch unified collection of the processed chestnuts as a whole.

[0040] In addition, the power input device 6 arranged on one side of the frame 1 can provide power for the working process of the equipment of the present invention (refer to Figure 3 , Figure 5), the power input device 6 is composed of a motor 6-1. The motor 6-1 transmits power to the conveyor belt driving shaft 3-4 through a bevel gear reducer 6-2. At the same time, on the conveyor belt driving shaft 3-4, the power is transmitted to the rear pressure belt wheel shaft 4-5 through a synchronous pulley belt 6-5 and a pressure belt reverse gear 6-3, realizing the same-direction and equal-speed movement of the upper side of the conveyor belt 3-1 and the lower side of the pressure belt wheel belt 4-1, ensuring more stable clamping of chestnuts by the two belts for notch processing. In addition, see Figure 1 , the conveyor belt driven shaft 3-2 and the conveyor belt driving shaft 2-4 are connected by a speed-matching belt 6-6 to ensure the movement of the trough-shaped conveyor belt 2-2 and the conveyor belt 3-1 at a certain speed relationship.

[0041] To facilitate the movement and stable placement of the equipment of the present invention on poor ground and ensure the normal operation of the equipment in various usage scenarios, a moving and parking device 7 is provided (see Figure 1 、 Figure 6 ). The moving and parking device is composed of a wheel body 7-1. One end of the wheel body 7-1 is provided with a universal wheel device (7-7 to 7-10). The universal wheel 7-10 is connected to the universal wheel outer sleeve 7-8 through a wheel shaft 7-9. The relative sliding of the universal wheel outer sleeve 7-8 and the universal wheel inner sleeve 7-7 can realize the omnidirectional rotation of the universal wheel 7-10 in the horizontal direction. In addition, a knob 7-5 is provided outside the wheel body 7-1 and connected to an internal worm 7-4 inside. The worm 7-4 is connected to a rotating shaft 7-3 through a worm gear 7-2. The rotating shaft 7-3 drives a rotating parking rod 7-6 to move through a chute, enabling the rotating parking rod to rotate and lift to support on the ground and achieve self-locking.

[0042] The automatic chestnut notch-cutting equipment provided by the present invention has the following operation process:

[0043] The user moves the equipment of the present invention to the working site through the bottom rollers, rotates the knobs above the rollers respectively, extends the parking rods from the bottoms of the four wheel feet to support on the ground, fixes and keeps the equipment horizontal. Then, pour the chestnuts to be processed into the square hopper above the equipment and place a collection container at the inclined chute outlet of the collection device. Finally, connect the equipment to the power supply and turn on the motor switch, and the chestnuts will undergo notch processing through the various devices of the equipment and enter the collection container placed by the user.

[0044] The above embodiments are the preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention should be equivalent replacement methods for achieving the purpose of the present invention, but these changes and deformations should all fall within the protection scope of the appended claims of the present invention.

Claims

1. A rotary cutting type automatic chestnut incision device, characterized in that, Comprising: A frame-type carrier (1); a feeding device (2) arranged on the top of the frame-type carrier (1), the feeding device (2) includes a square hopper (2-1) and a trough-shaped conveyor belt (2-2), the bottom of the square hopper (2-1) is open and not connected to the trough-shaped conveyor belt (2-2), and a dustpan-shaped chute (2-3) is arranged below the front end of the trough-shaped conveyor belt (2-2); a turning and transporting device (3) arranged below the feeding device (2), the turning and transporting device (3) includes a conveyor belt (3-1), a guiding groove (3-3), a conveyor belt driving shaft (3-4) and a conveyor belt driven shaft (3-2); a cutting device (4) arranged in the front part of the turning and transporting device (3), the cutting device (4) includes a front pressing pulley (4-2), a rear pressing pulley (4-4), a pressing pulley belt (4-1), a tool holder (4-10) and a serrated-edge circular blade (4-7), the front pressing pulley (4-2) and the rear pressing pulley (4-4) are connected by the pressing pulley belt (4-1), the cutting device (4) is composed of two groups of pressing pulleys, each group of pressing pulleys is composed of two symmetric and spaced-apart pressing pulleys, the position of the rear group of pressing pulleys is fixed and higher than that of the front group; a tool holder (4-10) is clamped between the left and right pressing pulleys of the front group of pressing pulleys and is fixedly connected to the front pressing pulley shaft, a serrated-edge circular blade (4-7) is arranged on the tool holder, the gear on the blade gear shaft (4-9) is connected to the blade reverse gear (4-8) on the tool holder and then meshes with the inner gear ring of the front pressing pulley, so that the serrated-edge circular blade forms a reverse rotation with the front pressing pulley, and the serrated-edge circular blade extends 1 mm out of the gap between the two pressing pulleys; in addition, the front group of pressing pulleys and the tool holder (4-10) fixedly connected to the front pressing pulley shaft can float up and down along with the front pressing pulley shaft under the action of a spring (4-6) on the front pressing pulley shaft (4-3), so as to achieve the purpose of profiling the convex surface of chestnuts and performing equal-depth cutting treatment; a collecting device (5) arranged below the cutting device (4), the collecting device (5) includes an inclined chute (5-1) and an infrared sensor (5-2); a power input device (6) arranged on one side of the frame-type carrier (1), including a motor (6-1), a bevel gear reducer (6-2), a synchronous pulley belt (6-5) and a speed ratio belt (6-6), the motor (6-1) drives the conveyor belt driving shaft (3-4) through the bevel gear reducer (6-2), and the conveyor belt driving shaft is connected to the reverse gear (6-3) of the pressing pulley through the synchronous pulley belt (6-5) and then connected to the rear pressing pulley shaft (4-5) in the cutting device (4); a moving and stopping device (7) arranged at the bottom of the frame-type carrier (1).

2. The rotary cutting type automatic chestnut incision device according to claim 1, characterized in that: The chestnuts to be processed enter the square hopper and move forward along with the trough-shaped conveyor belt. After encountering the obstruction of the front wall of the square hopper (2-1), they fall into the single-row long groove on the trough-shaped conveyor belt and leave the square hopper along with the trough-shaped conveyor belt, and slide onto the turning and transporting device (3) through the dustpan-shaped chute (2-3).

3. The rotary cutting type chestnut automatic incision device according to claim 2, characterized in that: The chestnuts to be processed slide onto the moving conveyor belt (3-1) at a certain relative speed, then turn over with the convex side facing up and move forward together with the conveyor belt. After passing through the guide groove (3-3) connected to the frame-type carrier, they are arranged in several columns and enter each group of cutting devices (4) successively for cutting treatment simultaneously.

4. The rotary cutting type chestnut automatic notch device according to claim 1, wherein: The inclined chute (5-1) is located below the cutting device (4); after being processed by the cutting device, each group of chestnuts naturally fall onto the inclined chute and slide towards the unified outlet; in addition, during the process of the chestnuts leaving the cutting device and falling onto the inclined chute, the infrared sensor (5-2) arranged along the way can count the chestnuts one by one, which is convenient for subsequent batch collection.

5. The rotary cutting type automatic chestnut incision device according to claim 4, characterized in that: The power input device (6) consists of a motor, a bevel gear reducer, a reverse gear for the pressure belt wheel, and a synchronous belt. The motor (6-1) is connected to the conveyor belt drive shaft (3-4) in the flipping and conveying device (3) after passing through the bevel gear reducer (6-2) to transmit power; the conveyor belt drive shaft is connected to the reverse gear for the pressure belt wheel (6-3) through the synchronous belt (6-5) and then connected to the rear pressure belt wheel shaft (4-5) in the cutting device (4), so that the upper side of the conveyor belt and the lower side of the pressure belt wheel move at the same speed in the same direction, ensuring more stable cutting treatment when the pressure belt wheel holds the chestnuts; at the same time, the conveyor belt driven shaft (3-2) and the conveyor belt drive shaft (2-4) are connected by a speed-matching belt (6-6) to ensure that the trough-shaped conveyor belt and the conveyor belt move at a certain speed relationship.

6. The rotary cutting type automatic chestnut incision device according to claim 5, characterized in that: The moving and parking device (7) consists of a wheel body (7-1). One end of the wheel body is provided with a universal wheel device. The universal wheel (7-10) is connected to the outer sliding sleeve of the universal wheel (7-8) through a wheel shaft (7-9). The relative sliding of the outer sliding sleeve (7-8) and the inner sliding sleeve (7-7) of the universal wheel can achieve the omnidirectional rotation of the universal wheel in the horizontal direction; in addition, a knob (7-5) is arranged outside the wheel body and connected to the internal worm (7-4). The worm (7-4) is connected to the rotating shaft (7-3) through a worm gear (7-2). The rotating shaft (7-3) drives the rotating parking rod (7-6) to move through a chute, so that the rotating parking rod (7-6) can rotate and lift to support on the ground and achieve self-locking.

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