A conveying device for food industry processing

Abstract

The application relates to a conveying device for food industrial processing, and belongs to the technical field of conveying devices, which comprises a track unit in the shape of a ring and provided with a load-bearing track; a transportation unit is rollingly connected to the load-bearing track, the transportation unit is provided with a supporting plate assembly used for placing meat food raw materials; an oil-repellent plate is connected to the top of the supporting plate assembly, the oil-repellent plate is provided with micron-level synapses and a food-grade low-surface-energy coating, and blood water and oil exuded by the meat food raw materials cannot be attached to the surface of the oil-repellent plate; the conveying device can solve the technical problem that in the prior art, bacteria are bred due to the attachment of biological substances exuded from the inside of food raw materials to the conveying device, the secondary pollution probability in the conveying process is increased, and the food safety of rabbit meat product processing is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of conveying devices, and particularly relates to a conveying device for food industrial processing. BACKGROUND

[0002] The market of hand-torn rabbit is expanding year by year, and the traditional hand-made method cannot meet the market demand, so it is necessary to process the hand-torn rabbit industrially. The hand-torn rabbit is processed industrially by using batch-fed and slaughtered meat rabbits with approximately the same size and weight as raw materials, and the meat rabbits are transported from the breeding and slaughtering factory to the food processing factory through cold chain transportation. In the processing link, the rabbit meat needs to be thawed, washed and preliminarily processed, and an industrialized conveying device is needed between these process links to improve the production efficiency.

[0003] The existing patent with the publication number CN213169820U discloses a conveying device for food processing and production, which comprises a cabinet, rotatable wheels, a conveying belt, a conveying motor, a roller pressing device, a feeding device and a cleaning device. The bottom of the cabinet is fixedly provided with a plurality of rotatable wheels, the top of the cabinet is fixedly provided with a conveying belt base, the conveying belt base is movably provided with a conveying belt, the output shaft of the conveying belt is fixedly connected with the rotor of the conveying motor, the top of one end of the conveying belt is provided with a feeding device, and the feeding device comprises a feeding top frame, an annular slide, an annular slide block, an extension cylinder, a photoelectric induction switch, a feeding frame, a UV irradiation lamp, a repeated motion motor mechanism, a rotating wheel, a feeding tray and a soft rubber pad.

[0004] The existing technology has the following defects:

[0005] Only the UV irradiation lamp is used to simply disinfect the food raw materials when the food raw materials are fed, and the bacteria generated by the attachment of the internal overflow biological matter of the thawed rabbit meat to the conveying device cannot be killed and eliminated, so that the secondary pollution probability in the conveying process is increased, and the food safety of the rabbit meat product processing is reduced. SUMMARY

[0006] The application provides a conveying device for food industrial processing, which can solve the technical problem that the internal overflow biological matter of the food raw materials is attached to the bacteria generated by the conveying device, the secondary pollution probability in the conveying process is increased, and the food safety of the rabbit meat product processing is reduced.

[0007] In order to achieve the above purpose, the application realizes the technical scheme as follows:

[0008] The application provides a conveying device for food industrial processing, which comprises:

[0009] The track unit is annular and has a load-bearing track.

[0010] The transport unit is rotatably connected to the load-bearing rail, and the transport unit has a pallet assembly for placing meat food raw materials.

[0011] An oleophobic plate is attached to the top of the tray assembly. The oleophobic plate has micron-level synapses and a food-grade low surface energy coating, preventing blood and grease from the meat food ingredients from adhering to the surface of the oleophobic plate.

[0012] By using the above technical solution, an oleophobic plate is installed in the transportation unit to prevent blood and oil seeping from meat raw materials from adhering to the surface of the transportation unit, thereby reducing the risk of bacterial growth and the probability of secondary contamination, and improving the food safety of rabbit meat product processing.

[0013] In this invention, the above-mentioned pallet assembly further includes:

[0014] The silicone plate is positioned below the oleophobic plate;

[0015] Several protrusions are integrally formed on the side of the silicone plate facing the oleophobic plate. The silicone plate is slidably connected to the oleophobic plate through the protrusions. The top of the protrusions passes through the oleophobic plate and abuts against the meat food raw material.

[0016] The above technical solution uses silicone plates and protrusions to reduce the contact area between rabbit meat and the grease-repellent plate, thereby improving the discharge of blood and oil.

[0017] In this invention, the above-mentioned pallet assembly further includes:

[0018] Several oscillators abut against the bottom of the silicone plate, and the oscillators drive the silicone plate to vibrate. The vibrating silicone plate keeps the meat food in a suspended state through brief contact with the meat food raw material.

[0019] The substrate is connected to the oscillator and the oleophobic plate;

[0020] An electronic control unit is connected to the side of the substrate opposite to the oscillator. The electronic control unit supplies power to the oscillator and can adjust the vibration parameters of the oscillator.

[0021] The above technical solution uses a vibrator to make the silicone plate vibrate. The protrusions on the vibrating silicone plate suspend the meat raw materials in the air, reducing contact time and friction, reducing damage to rabbit meat, and improving the preservation of rabbit meat quality during transportation.

[0022] In this invention, the transport unit further includes:

[0023] The bracket is connected to the side of the substrate facing away from the silicone plate;

[0024] The drive wheel is connected to the bottom of the bracket, the distance between the drive wheel and the bracket is adjustable, and the drive wheel abuts against the bottom of the load-bearing track;

[0025] The drive motor is connected to the drive wheel, and the drive motor is electrically connected to the electronic control unit. The electronic control unit supplies power to the drive motor and controls the start and stop of the drive motor.

[0026] The driven wheel is rotatably connected to the bracket, and the driven wheel and the driving wheel are symmetrically arranged relative to the load-bearing track.

[0027] By employing the above technical solution, which uses adjustable-spacing drive wheels and driven wheels to clamp the load-bearing rail, and uses a drive motor to move the transport unit, the movement independence of the transport unit can be improved, as well as the maintainability of a single transport unit that can be disassembled, thus avoiding the waste of maintenance time caused by overall shutdown for cleaning.

[0028] In this invention, the transport unit further includes:

[0029] The outer guide wheel and the inner guide wheel are connected to the side of the substrate away from the silicone plate. The outer guide wheel and the inner guide wheel are respectively disposed on both sides of the load-bearing track. The outer guide wheel, the inner guide wheel and the drive wheel are arranged in a triangular distribution.

[0030] The aforementioned orbital unit also includes:

[0031] The outer track and the inner track are connected, with the outer guide wheel abutting against the outer track and the inner guide wheel abutting against the inner track.

[0032] The above technical solution, which combines inner and outer tracks and guide wheels, improves the movement stability of the transport unit.

[0033] In this invention, the above-mentioned orbital unit has:

[0034] The feeding area is located at one end of the track unit. The feeding area is U-shaped, and the outer track and the inner track within the feeding area are at the same height.

[0035] The unloading area is located at one end of the track unit away from the loading area. The unloading area is U-shaped, and the height of the outer track in the loading area is lower than the height of the inner track.

[0036] The conveying area connects the loading area and the unloading area;

[0037] Within the loading area, unloading area, and conveying area, the shortest distance between the load-bearing track, the outer track, and the inner track is equal.

[0038] The above technical solution uses the height variation of the inner and outer tracks to tilt the transport unit at an angle, which facilitates automatic unloading. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 An isometric drawing of a conveying device for industrial food processing provided in an embodiment of the present invention, with only one transport unit installed;

[0041] Figure 2 A front view of a conveying device for industrial food processing provided in an embodiment of the present invention, showing only one set of transport units installed;

[0042] Figure 3 for Figure 2 Sectional view at point AA;

[0043] Figure 4 A side view of a transport unit provided in an embodiment of the present invention;

[0044] Figure 5 A top view of a transport unit provided in an embodiment of the present invention;

[0045] Figure 6 for Figure 5 Sectional view at point BB in the middle;

[0046] Figure 7 for Figure 5 Sectional view at point CC.

[0047] Icons: 1-Transportation unit; 101-Driving wheel; 102-Drive motor; 103-Adjusting rod; 104-Driven wheel; 105-Outer guide wheel; 106-Inner guide wheel; 107-Bracket; 108-Electrical control unit; 110-Pattern assembly; 111-Oil-repellent plate; 112-Silicone plate; 1121-Protrusion; 113-Base plate; 114-Vibrator; 2-Rail unit; 201-Bearing rail; 202-Outer rail; 203-Inner rail. Detailed Implementation

[0048] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0049] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0050] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0051] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to welding, bolting, or riveting; 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 communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0052] Example:

[0053] Please refer to Figures 1 to 7 , Figures 1 to 7 The image shown is an embodiment of this application.

[0054] This embodiment provides a conveying device for industrial food processing, such as... Figure 1 and Figure 4 It includes, as shown:

[0055] Track unit 2 is circular and has a load-bearing track 201;

[0056] The transport unit 1 is rotatably connected to the load-bearing rail 201. The transport unit 1 has a pallet assembly 110, which is used to place meat food raw materials.

[0057] The oleophobic plate 111 is connected to the top of the tray assembly 110. The oleophobic plate 111 has micron-level synapses and a food-grade low surface energy coating, so that blood and oil seeping from meat raw materials cannot adhere to the surface of the oleophobic plate 111.

[0058] The core of the superoleophobic surface of the upper surface of the oleophobic plate 111 is to trap air through a "micro-nano hierarchical structure" (micron- or nano-scale synapses, grooves, etc.), so that liquids and oils only come into contact with the top of the structure. The specific structure is based on the hydrophobic structure of a lotus leaf. The synapse size and spacing were adjusted through a limited number of experiments to achieve the oleophobic effect. Its structure must meet the following requirements:

[0059] Scale matching: The synapse size needs to match the surface tension of the liquid (the surface tension of water is about 72mN / m), usually in the micrometer range (1μm-100μm). Too large or too small a size will impair the air trapping capacity.

[0060] Spacing rationality: The synaptic spacing needs to be equal to or smaller than the height (generally, the synaptic spacing is ≤ 2-3 times the height) to ensure that air is stably trapped in the structural gaps and supports the suspension of liquid.

[0061] Food-grade low surface energy coatings, exemplarily employing silicon-based nanocoatings, comply with FDA 21 CFR 177 standards.

[0062] It should be noted that the specific structure and dimensions of the micro-nano hierarchical structure are trade secrets and are not within the scope of protection of this application. Any other structure, coating and combination thereof that can achieve oleophobic effect may be used (exemplary microstructure mimicking the surface of a lotus leaf).

[0063] By using the above technical solution, an oleophobic plate 111 is installed in the transport unit 1 to prevent blood and oil seeping from meat raw materials from adhering to the surface of the transport unit 1, thereby reducing the risk of bacterial growth and the probability of secondary contamination, and improving the food safety of rabbit meat product processing.

[0064] As a preferred implementation method, such as Figure 6 and Figure 7 As shown, the pallet assembly 110 further includes:

[0065] A silicone plate 112 is disposed below an oleophobic plate 111;

[0066] Several protrusions 1121 are integrally formed on the side of the silicone plate 112 facing the oleophobic plate 111. The silicone plate 112 is slidably connected to the oleophobic plate 111 via the protrusions 1121. The tops of the protrusions 1121 pass through the oleophobic plate 111 and abut against the meat food raw material. Figure 5 , Figure 6 as well as Figure 7 As shown, the top surface of the grease-draining plate 111 is inclined, and the height of several protrusions 1121 is arc-shaped, which can prevent the rabbit meat from sliding out along the direction of movement and mainly balance the displacement caused by the acceleration of movement. The inclined surface of the grease-draining plate 111 facilitates the drainage of oil and blood.

[0067] It should be noted that, in order to ensure the sliding accuracy of the protrusion 1121 and the oleophobic plate 111, and to control the sliding gap, and to prevent grease and blood from seeping into the surface of the silicone plate 112 through the gap, the hardness of the silicone plate 112 can be increased. However, the protrusion 1121 part needs to use a relatively softer silicone material to avoid damaging the rabbit meat. The protrusion 1121 and the synapse mentioned above are two completely different structures. The protrusion 1121 is a macroscopic columnar protrusion, the purpose of which is to reduce the contact area with the rabbit meat, while the synapse is a microstructure that produces an oleophobic effect. It should be noted that the spacing of the protrusion 1121 should be set to avoid direct contact between the rabbit meat and the synapse on the surface of the oleophobic plate 111, because the microstructure of the synapse does not have good support performance. Direct contact with the rabbit meat will cause damage to the synapse, thereby reducing the oleophobic and hydrophobic properties.

[0068] The above technical solution uses a silicone plate 112 and protrusions 1121 to reduce the contact area between rabbit meat and the grease-repellent plate 111, thereby improving the discharge of blood and oil.

[0069] As a preferred implementation method, such as Figure 6 and Figure 7 As shown, the pallet assembly 110 further includes:

[0070] Several oscillators 114 are attached to the bottom of the silicone plate 112. The oscillators 114 drive the silicone plate 112 to vibrate. The vibrating silicone plate 112 keeps the meat food suspended in the air through brief contact with the meat food raw material.

[0071] The substrate 113 is connected to the oscillator 114 and the oleophobic plate 111;

[0072] The electronic control unit 108 is connected to the side of the substrate 113 facing away from the oscillator 114. The electronic control unit 108 supplies power to the oscillator 114 and can adjust the vibration parameters of the oscillator 114. The specific electronic control unit 108 includes, but is not limited to, a battery, an electronic control board, a switch, a frequency tuning knob, etc.

[0073] When using this device, it is recommended to select a vibration frequency of 80Hz-150Hz and an amplitude of 1mm-4mm to avoid the hard impact caused by low-frequency vibration (<50Hz) due to the large weight of the rabbit, and to avoid the overlap of the resonant sensitive frequencies of the rabbit's torso, which could cause internal contusions to the trunk muscles due to resonance. If the amplitude is too small, the rabbit will have difficulty detaching from the surface due to insufficient inertial force, and blood may adhere due to continuous contact. If the amplitude is too large, the rabbit will be violently thrown up, and its center of gravity will shift during the fall, making it prone to tipping over. By using a small amplitude and medium-high frequency, the instantaneous upward acceleration can reach 1.5g-2.2g, ensuring that the rabbit is "lightly thrown" off the surface rather than violently bounced.

[0074] It should be noted that the above parameters are theoretical design values. In actual use, empirical factors need to be introduced. These empirical factors are obtained based on experiments with whole rabbits of different weight ranges. It should also be noted that, due to industrial processing, it is also necessary to adapt to industrialized farming to obtain raw materials for meat products with smaller weight deviations. Through source control or in-plant sorting, rabbit meat is processed in batches according to weight to ensure that the weight of each batch of processed rabbit meat is approximately the same. The parameters are then adjusted based on empirical factors and theoretical values. Those skilled in the art can complete this step through a limited number of experiments based on this idea, but the specific parameter settings are not within the scope of protection of this application.

[0075] Through the above technical solution, the vibrator 114 is used to vibrate the silicone plate 112. The protrusions 1121 on the vibrating silicone plate 112 suspend the meat raw materials, reduce contact time and friction, reduce damage to rabbit meat, and improve the preservation of rabbit meat quality during transportation.

[0076] As a preferred implementation method, such as Figure 4 As shown, the aforementioned transport unit 1 further includes:

[0077] The bracket 107 is connected to the side of the substrate 113 facing away from the silicone plate 112;

[0078] The drive wheel 101 is connected to the bottom of the bracket 107. The distance between the drive wheel 101 and the bracket 107 is adjustable. The drive wheel 101 abuts against the bottom of the load-bearing rail 201.

[0079] The drive motor 102 is connected to the drive wheel 101 via a transmission. The drive motor 102 is electrically connected to the electronic control unit 108. The electronic control unit 108 supplies power to the drive motor 102 and controls the start and stop of the drive motor 102.

[0080] Driven wheel 104 is rotatably connected to bracket 107. Driven wheel 104 and driving wheel 101 are symmetrically arranged relative to load-bearing rail 201.

[0081] When using, such as Figure 4 As shown, the driven wheel 104 with grooves is placed on the load-bearing rail 201, and then the driving wheel 101 is pressed against the load-bearing rail 201 from below by adjusting the rod 103 and the nut.

[0082] It should be noted that the drive wheel 101 is located below the load-bearing rail 201 and does not need to bear the weight of the transport unit 1. The friction between the drive wheel 101 and the load-bearing rail 201 can be adjusted by simply adjusting the adjusting rod 103. At the same time, because the contact surface is below, the friction is not easily affected by external factors such as dust, blood, and grease. Since multiple transport units 1 move simultaneously on the rail unit 2 during use, in order to ensure the consistency of the start and stop of the movement and avoid mutual collision, the drive motor 102 adopts a servo motor. The electronic control unit 108 also includes a wireless control unit, specifically a Bluetooth transceiver or other wireless control module, for batch control.

[0083] By using the above technical solution, the load-bearing rail 201 is clamped by the adjustable spacing drive wheel 101 and driven wheel 104, and the transport unit 1 is moved by the drive motor 102. This can improve the movement independence of the transport unit 1 and the maintainability of a single transport unit 1, thus avoiding the waste of maintenance time caused by overall shutdown for cleaning.

[0084] As a preferred implementation method, such as Figure 3 As shown, the aforementioned transport unit 1 further includes:

[0085] The outer guide wheel 105 and the inner guide wheel 106 are connected to the side of the base plate 113 away from the silicone plate 112. The outer guide wheel 105 and the inner guide wheel 106 are respectively arranged on both sides of the load-bearing track 201. The outer guide wheel 105, the inner guide wheel 106 and the drive wheel 101 are arranged in a triangular distribution.

[0086] The aforementioned orbital unit 2 also includes:

[0087] The outer track 202 and the inner track 203 are connected, the outer guide wheel 105 abuts against the outer track 202, and the inner guide wheel 106 abuts against the inner track 203.

[0088] In use, after the drive wheel 101 is installed, the positions of the bases of the outer guide wheel 105 and the inner guide wheel 106 are adjusted through the waist-shaped hole so that the grooves of the guide wheels can be inserted into the track. Then, the base is fixed to the bottom surface of the base plate 113 with screws to complete the installation.

[0089] The above technical solution, which uses a combination of inner and outer tracks 202 and guide wheels, improves the motion stability of the transport unit 1.

[0090] As a preferred implementation method, such as Figure 1 and Figure 2 As shown, the above-mentioned orbital unit 2 has:

[0091] The feeding area is located at one end of the track unit 2. The feeding area is U-shaped, and the outer track 202 and the inner track 203 in the feeding area are at the same height.

[0092] The unloading area is located at one end of the track unit 2 away from the loading area. The unloading area is U-shaped, and the height of the outer track 202 in the loading area is lower than the height of the inner track 203.

[0093] The conveying area connects the loading area and the unloading area;

[0094] Within the loading area, unloading area, and conveying area, the shortest distance between the load-bearing track 201, the outer track 202, and the inner track 203 is equal.

[0095] It should be noted that the height of the outer track 202 in the unloading area is lower than the height of the inner track 203. This is based on the trajectory formed by curve fitting after the triangular wheels on the transport unit 1 rotate relative to the load-bearing track 201. After manufacturing the curved track according to theoretical data, the transport unit 1 needs to be used to detect the track spacing to ensure unobstructed passage; for example... Figure 1 As shown, the load-bearing track 201, outer track 202, and inner track 203 are connected and supported by a pipe frame. It is important to note that the connection angle of the steel pipes must avoid the movement trajectory of the wheels. Figure 1 This is just a rough schematic diagram of the pipe rack. Based on the load-bearing capacity and material rigidity, finite element analysis should be used to design supplementary supports for parts with poor stability.

[0096] By using the above technical solution, the height of the inner and outer tracks 202 is changed, so that the transport unit 1 can be tilted at an angle, which facilitates automatic unloading.

[0097] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope described in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A conveying device for industrial food processing, characterized in that, include: The track unit (2) is circular and has a load-bearing track (201). The transport unit (1) is rotatably connected to the load-bearing rail (201), and the transport unit (1) has a pallet assembly (110) for placing meat food raw materials; An oleophobic plate (111) is connected to the top of the tray assembly (110). The top surface of the oleophobic plate (111) is inclined. The oleophobic plate (111) has micron-level synapses and a food-grade low surface energy coating. Blood and oil seeping from the meat food raw materials cannot adhere to the surface of the oleophobic plate (111). The pallet assembly (110) also includes: A silicone plate (112) is disposed below the oleophobic plate (111); A plurality of protrusions (1121) are integrally formed on the side of the silicone plate (112) facing the oleophobic plate (111). The silicone plate (112) is slidably connected to the oleophobic plate (111) through the protrusions (1121). The top of the protrusions (1121) passes through the oleophobic plate (111) and abuts against the meat food raw material. The height of the plurality of protrusions (1121) is arc-shaped. Several oscillators (114) are abutted against the bottom of the silicone plate (112). The oscillators (114) drive the silicone plate (112) to vibrate. The vibrating silicone plate (112) keeps the meat food suspended in the air through brief contact with the meat food raw material. The substrate (113) is connected to the oscillator (114) and the oleophobic plate (111); An electronic control unit (108) is connected to the side of the substrate (113) opposite to the oscillator (114). The electronic control unit (108) supplies power to the oscillator (114) and can adjust the vibration parameters of the oscillator (114).

2. The conveying device for industrial food processing according to claim 1, characterized in that, The transport unit (1) also includes: The bracket (107) is connected to the side of the substrate (113) facing away from the silicone plate (112); The drive wheel (101) is connected to the bottom of the bracket (107). The distance between the drive wheel (101) and the bracket (107) is adjustable. The drive wheel (101) abuts against the bottom of the load-bearing rail (201). A drive motor (102) is connected to the drive wheel (101) via a transmission. The drive motor (102) is electrically connected to the electronic control unit (108). The electronic control unit (108) supplies power to the drive motor (102) and controls the start and stop of the drive motor (102). Driven wheel (104) is rotatably connected to bracket (107). Driven wheel (104) and drive wheel (101) are symmetrically arranged relative to load-bearing track (201).

3. The conveying device for industrial food processing according to claim 2, characterized in that, The transport unit (1) also includes: An outer guide wheel (105) and an inner guide wheel (106) are connected to the side of the substrate (113) away from the silicone plate (112). The outer guide wheel (105) and the inner guide wheel (106) are respectively disposed on both sides of the load-bearing track (201). The outer guide wheel (105), the inner guide wheel (106) and the drive wheel (101) are arranged in a triangular pattern. The orbital unit (2) also includes: The outer track (202) and the inner track (203) are connected, the outer guide wheel (105) abuts against the outer track (202), and the inner guide wheel (106) abuts against the inner track (203).

4. The conveying device for industrial food processing according to claim 3, characterized in that, The orbital unit (2) has: The feeding area is located at one end of the track unit (2). The feeding area is U-shaped, and the outer track (202) and the inner track (203) in the feeding area are at the same height. The unloading area is located at one end of the track unit (2) away from the loading area. The unloading area is U-shaped, and the height of the outer track (202) in the loading area is lower than the height of the inner track (203). A conveying area connects the loading area and the unloading area; Within the loading area, unloading area, and conveying area, the shortest distance between the load-bearing track (201), the outer track (202), and the inner track (203) is equal.

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