A conveying device suitable for food boxes of different sizes

Abstract

This invention discloses a conveying device suitable for food boxes of different sizes, belonging to the technical field of conveying equipment. It includes a base plate on which symmetrically slidingly mounted adjustable carriages are mounted. Each adjustable carriage is equipped with a transport component, a support component, and a transfer component. By setting the transport component, the distance between two conveyor belts can be adjusted, thereby adapting to the conveying of food boxes of different sizes and improving the versatility and flexibility of the device. By setting the support component, under the action of a supporting square plate, it can provide auxiliary support for the food boxes during conveying, ensuring that the food boxes are always conveyed horizontally and preventing tilting or damage due to deformation of the conveyor belt. Through the cooperation of the transfer component and the support component, the supporting square plate can be quickly transferred, thereby continuously providing auxiliary support for the conveyor belt conveying the food boxes.

Description

Technical Field

[0001] This invention relates to the field of conveying equipment technology, and in particular to a conveying device suitable for food boxes of different sizes. Background Technology

[0002] In the food processing and logistics industry, conveying devices are key equipment to ensure the efficient and safe transportation of food boxes. However, existing conveying devices are usually only suitable for food boxes of specific sizes, lacking versatility and flexibility. This leads to the need for frequent equipment changes or adjustments when dealing with food boxes of different sizes, which not only increases the complexity of operation but also reduces production efficiency and brings additional costs. Furthermore, during the conveying process, the conveying device is prone to causing food boxes to tilt, shake, or even be damaged due to deformation of the conveyor belt or insufficient support, affecting the safety and integrity of the food. Therefore, this invention provides a conveying device suitable for food boxes of different sizes. Summary of the Invention

[0003] This invention addresses the shortcomings of existing technologies by providing a conveying device suitable for food boxes of different sizes. It overcomes the problems of not being able to meet the conveying needs of food boxes of different sizes and the food boxes being prone to tilting, shaking, or even being damaged due to deformation of the conveyor belt or insufficient support.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a conveying device suitable for food boxes of different sizes, comprising a base plate, on which adjustable-distance slides are symmetrically slidably mounted, each adjustable-distance slide being provided with a transport component, a support component, and a transfer component. The transport component includes a conveyor belt, and the support component includes two support strip plates one and two support strip plates two, both of which are symmetrically fixed on the adjustable-distance slides. Multiple support square plates are evenly arranged between the support strip plates one and their corresponding support strip plates two. The supporting square plate is used to support the inner side of the conveyor belt. Friction wheels are symmetrically and rotatably mounted on the adjustable carriage. Friction strips are fixedly installed on each of the supporting square plates. The friction wheels and friction strips are used to move the supporting square plates. The transfer assembly includes two symmetrically and rotatably mounted cross plates on the adjustable carriage. Transfer slide plates are slidably mounted on the four arms of the cross plates. A straight plate is fixedly installed on each of the transfer slide plates. The lower surface of the supporting square plates is provided with a groove that mates with the straight plate. The cross plates and transfer slide plates are used to realize the transfer of the supporting square plates.

[0005] Furthermore, a double-ended threaded screw is rotatably mounted on the base plate. The threads at both ends of the double-ended threaded screw form a helical pair with the corresponding adjustable pitch slide. A drive shaft is symmetrically rotatably mounted on the adjustable pitch slide. A transport wheel is fixedly mounted on the drive shaft, and a transport belt is set on the two corresponding transport wheels.

[0006] Furthermore, the base plate is also rotatably mounted with a double-headed spline shaft. Each of the two transport components has a drive shaft and a double-headed spline shaft that form a spline sliding fit. The two double-headed spline shafts that form a spline sliding fit with the double-headed spline shaft are arranged opposite to each other.

[0007] Furthermore, the supporting square plate and the corresponding supporting long strip plate one and supporting long strip plate two are in sliding fit. When the supporting square plate is located between supporting long strip plate one and supporting long strip plate two, the two adjacent supporting square plates are in contact. The supporting square plate between supporting long strip plate one and supporting long strip plate two closest to the conveyor belt is located directly below the inner side of the conveyor belt. The supporting square plate is used to provide auxiliary support when the conveyor belt transports items.

[0008] Furthermore, when the friction strip and the friction wheel are in contact, there is friction between them. The width of the friction strip and the supporting square plate are equal. When the supporting square plate is located between the supporting long strip one and the supporting long strip two, the corresponding friction strip and the adjacent friction strip are in contact.

[0009] Furthermore, a limiting block is fixedly installed on the lower surface of the transfer slide, and a spring is installed between the limiting block and the cross plate. When the transfer slide moves to the position furthest from the lower surface of the base plate, the upper surface of the transfer slide and the lower surface of the supporting square plate are on the same plane.

[0010] Furthermore, symmetrical fan-shaped strips are fixedly installed on both sides of the adjustable slide, and a positioning slide is slidably installed on each of the adjustable slides. Arc-shaped strips are also symmetrically fixed on both sides of the positioning slide. The fan-shaped strips and arc-shaped strips on the same side of the adjustable slide are spaced apart. When the two fan-shaped strips and two arc-shaped strips on the same side of the adjustable slide are joined together, they form a complete limiting ring plate. Each limiting block is provided with a sliding groove that mates with the limiting ring plate. The axis of the limiting ring plate and the center line of the cross rotating plate are on the same straight line.

[0011] Furthermore, a transmission group one is provided between two friction wheels on the same adjustable slide, and a linkage group one is provided between the two transmission groups one; a transmission group two is provided between two cross rotating plates on the same adjustable slide, and a linkage group two is provided between the two transmission groups two.

[0012] Furthermore, L-shaped adjusting plates are fixedly installed on the lower surface of the adjusting slide, and adjusting electric cylinders are fixedly installed on the base plate. The L-shaped adjusting plates are all in sliding engagement with the piston rod end of the adjusting electric cylinder.

[0013] The advantages of this invention compared with the prior art are: (1) By setting up a transport component, this invention can adjust the spacing between two transport belts, thereby adapting to the transport of food boxes of different sizes and improving the versatility and flexibility of the device. (2) By setting up a support component, this invention can provide auxiliary support for the food boxes during transport under the action of the support square plate, ensuring that the food boxes can always be transported horizontally and preventing the food boxes from tilting or being damaged due to the deformation of the transport belt. (3) Through the cooperation of the transfer component and the support component, this invention can realize the rapid transfer of the support square plate, thereby continuously providing auxiliary support for the transport of food boxes by the transport belt. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the structure of the adjustable slide of the present invention.

[0016] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0017] Figure 4 This is a schematic diagram of the structure supporting the square plate in this invention.

[0018] Figure 5 for Figure 4 A magnified view of a portion of point B in the middle.

[0019] Figure 6 This is a schematic diagram of the structure of the adjusting slide of the present invention.

[0020] Figure 7 for Figure 6 A magnified view of a portion of point C.

[0021] Figure 8 for Figure 6 A magnified view of a portion of point D.

[0022] Figure 9 This is a top view of the structure at the cross-shaped rotating plate of the present invention.

[0023] Figure 10 This is a schematic diagram of the structure of the cross-shaped rotating plate of the present invention.

[0024] Figure 11 This is a schematic diagram of the structure of the conveyor belt in this invention.

[0025] Figure 12 for Figure 11 A magnified view of a portion of point E in the middle.

[0026] Reference numerals: 101-Base plate; 102-Conveyor belt; 103-Adjustable carriage; 104-Drive shaft; 105-Adjustable motor; 106-Double-ended threaded screw; 107-Transport wheel; 108-Double-ended splined shaft; 109-Transport motor; 110-Support square plate; 111-L-shaped adjusting plate; 112-Drive pulley one; 113-Drive belt one; 114-Friction wheel; 115-Cross rotating plate; 116-Transfer slide plate; 117- 118-Straight plate; 119-Fan-shaped strip plate; 120-Limiting round block; 121-Arc-shaped strip plate; 122-Friction strip plate; 123-Supporting long strip plate one; 124-Supporting long strip plate two; 125-Transmission belt two; 126-Transmission pulley two; 127-Gearbox one; 128-Gearbox two; 129-Shifting motor; 130-Telescopic rod one; 131-Transfer motor; 132-Telescopic rod two; 133-Shifting electric cylinder. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0028] Example: Reference Figures 1-12 A conveying device suitable for food boxes of different sizes includes a base plate 101. Adjustable slides 103 are symmetrically slidably mounted on the base plate 101. A double-ended threaded screw 106 is rotatably mounted on the base plate 101. The threads at both ends of the double-ended threaded screw 106 form helical pairs with the corresponding adjustable slides 103. An adjustable motor 105 is fixedly mounted on the base plate 101. The output shaft of the adjustable motor 105 is fixedly connected to the double-ended threaded screw 106. When the adjustable motor 105 is started, it drives the double-ended threaded screw 106 to rotate, causing the two adjustable slides 103 to move closer to each other or further away from each other.

[0029] Each adjustable carriage 103 is equipped with a transport assembly, which includes a transport belt 102. A drive shaft 104 is symmetrically and rotatably mounted on each adjustable carriage 103. Transport wheels 107 are fixedly mounted on the drive shafts 104, located at the ends of the drive shafts 104 closest to their respective adjustable carriage ends. The transport belt 102 is mounted on the two corresponding transport wheels 107. A double-headed splined shaft 108 is also rotatably mounted on the base plate 101. Each of the two transport assemblies contains one drive shaft 104. The two double-ended splined shafts 108 that form a spline sliding fit with the double-ended splined shaft 108 are arranged opposite each other. The transmission shaft 104 that does not contact the double-ended splined shaft 108 slides in fit with the base plate 101. The transport motor 109 is fixedly installed on the base plate 101. Both the output shaft of the transport motor 109 and the double-ended splined shaft 108 are fixedly installed with pulleys. A belt is provided between the pulley on the output shaft of the transport motor 109 and the pulley on the double-ended splined shaft 108.

[0030] When driving the two adjustable carriages 103 to move closer to each other or further apart, the drive shaft 104 engaged with the double-headed spline shaft 108 slides relative to the double-headed spline shaft 108, and the drive shaft 104 not engaged with the double-headed spline shaft 108 slides relative to the base plate 101. When the transport motor 109 is started, the double-headed spline shaft 108 rotates. Under the action of the double-headed spline shaft 108, the two corresponding drive shafts 104 rotate synchronously, causing the transport wheel 107 to rotate. Under the action of the transport belt 102, both the drive shaft 104 and the transport wheel 107 rotate synchronously, thereby causing the transport belt 102 to rotate as well.

[0031] Each adjustable slide 103 is equipped with a support assembly, which includes two support strip plates 122 and two support strip plates 123. The two support strip plates 122 and two support strip plates 123 are symmetrically fixed on the adjustable slide 103. Multiple support square plates 110 are evenly distributed between the support strip plates 122 and their corresponding support strip plates 123. The arms of the cross-shaped rotating plate 115 slide in contact with the support square plates 110. 10 is slidably engaged with the corresponding support strip 122 and support strip 2 123. When the support square plate 110 is located between the support strip 122 and support strip 2 123, the two adjacent support square plates 110 are in contact. The support square plate 110 between the support strip 122 and support strip 2 123 closest to the conveyor belt 102 is located directly below the inner side of the conveyor belt 102. The support square plate 110 is used to provide auxiliary support for the conveyor belt 102 when transporting items.

[0032] Friction wheels 114 are symmetrically rotatably mounted on the adjustable slide 103. Friction strips 121 are fixedly installed on the supporting square plate 110. The friction wheels 114 and friction strips 121 are used to move the supporting square plate 110. When the friction strips 121 and the friction wheels 114 are in contact, there is friction between them. The width of the friction strips 121 and the supporting square plate 110 is equal. When the supporting square plate 110 is located between the supporting long strip 122 and the supporting long strip 2 123, the corresponding friction strip 121 is in contact with the adjacent friction strip 121.

[0033] A transmission group 1 is provided between two friction wheels 114 on the same adjustable slide 103. Each transmission group 1 includes a transmission pulley 112, a transmission belt 113, and two pulleys. The transmission pulley 112 is rotatably mounted on the corresponding adjustable slide 103, and the two pulleys are fixedly mounted on the corresponding friction wheels 114. The transmission belt 113 is located between the transmission pulley 112 and the two pulleys. A linkage group 1 is provided between the two transmission groups 1. The linkage group 1 includes a telescopic rod 130 and two gearboxes 128. Two gearboxes 128 are fixedly mounted on corresponding adjustable slides 103. The output end of gearbox 128 is fixedly connected to the transmission pulley 112, and the input end of gearbox 128 is fixedly connected to the telescopic rod 130. Two bevel gears are provided inside gearbox 128. The two bevel gears in gearbox 128 mesh to form a gear pair. A shift motor 129 is fixedly mounted on one of the two adjustable slides 103. The output shaft of the shift motor 129 is fixedly connected to the corresponding transmission pulley 112.

[0034] When the two adjustable carriages 103 move relative to each other, the telescopic rod 130 automatically extends and retracts, activating the shift motor 129 to drive the corresponding transmission pulley 112 to rotate. Under the action of the gearbox 128 and the telescopic rod 130, the two transmission pulleys 112 rotate synchronously. Consequently, under the action of the transmission group 1, all four friction wheels 114 rotate synchronously. When the friction plate 121 contacts the friction wheel 114, the friction plate 121 moves under the action of the friction wheel 114, thereby causing... The supporting square plate 110 moves synchronously, that is, it slides between the supporting long strip plate 122 and the supporting long strip plate 123. When the supporting square plate 110 is located inside the conveyor belt 102, the two sides of the food box are placed on the conveyor belt 102. The supporting square plate 110 provides auxiliary support for the conveyor belt 102, that is, it provides auxiliary support for the food box. When the conveyor belt 102 transports the food box, the supporting square plate 110 moves synchronously, that is, it provides auxiliary support for the transportation of the food box.

[0035] Each adjustable slide 103 is equipped with a transfer assembly, which includes two symmetrically rotatably mounted cross plates 115 on the adjustable slide 103. Each of the four arms of the cross plates 115 is slidably mounted with a transfer slide plate 116. Each transfer slide plate 116 is fixedly mounted with a straight plate 117. The lower surface of the supporting square plate 110 is provided with a groove that mates with the straight plate 117. The cross plates 115 and the transfer slide plates 116 are used to realize the transfer of the supporting square plate 110.

[0036] A limiting block 119 is fixedly installed on the lower surface of the transfer slide 116. A spring is installed between the limiting block 119 and the cross rotating plate 115. In the initial position, the spring between the limiting block 119 and the cross rotating plate 115 is not compressed. At this time, the transfer slide 116 is located at the position closest to the lower surface of the base plate 101. When the transfer slide 116 moves to the position farthest from the lower surface of the base plate 101, the upper surface of the transfer slide 116 and the lower surface of the supporting square plate 110 are on the same plane.

[0037] On both sides of the adjustable slide 103, fan-shaped strips 118 are symmetrically fixed. Adjustable slides 124 are slidably installed on the adjustable slide 103. On both sides of the adjustable slide 124, arc-shaped strips 120 are also symmetrically fixed. The fan-shaped strips 118 and arc-shaped strips 120 on the same side of the adjustable slide 103 are spaced apart. When the two fan-shaped strips 118 and two arc-shaped strips 120 on the same side of the adjustable slide 103 are joined, a complete limiting ring plate is formed. The limiting round blocks 119 are provided with sliding grooves that cooperate with the limiting ring plate. The axis of the limiting ring plate and the center line of the cross rotating plate 115 are on the same straight line.

[0038] A transmission group two is provided between two cross plates 115 on the same adjustable slide 103. The transmission group two includes a transmission belt 125, a transmission pulley 126, and two pulleys. The two pulleys are respectively fixedly installed on the corresponding cross plates 115. The transmission pulley 126 is rotatably installed on the corresponding adjustable slide 103. The transmission belt 125 is located between the transmission pulley 126 and the two pulleys. A linkage group two is provided between the two transmission groups two. The linkage group two includes two gearboxes 127 and a telescopic rod 132. Two gearboxes 127 are fixedly mounted on corresponding adjustable slides 103. The output end of gearbox 127 is fixedly connected to the transmission pulley 126, and the input end of gearbox 127 is fixedly connected to the telescopic rod 132. Two bevel gears are provided inside gearbox 127. The two bevel gears in gearbox 127 mesh to form a gear pair. A transfer motor 131 is fixedly mounted on one of the two adjustable slides 103. The output shaft of the transfer motor 131 is fixedly connected to the corresponding transmission pulley 126.

[0039] When the two adjustable slides 103 move relative to each other, the telescopic rod 132 automatically extends and retracts, and the transfer motor 131 starts to drive the corresponding transmission pulley 126 to rotate. Under the action of the gearbox 127 and the telescopic rod 132, the two transmission pulleys 126 rotate synchronously, and then under the action of the transmission group 2, the four cross plates 115 rotate synchronously.

[0040] L-shaped adjusting plates 111 are fixedly installed on the lower surface of the adjusting slide 124, and adjusting electric cylinders 133 are fixedly installed on the base plate 101. The L-shaped adjusting plates 111 are slidably engaged with the piston rod end of the adjusting electric cylinder 133. When the adjusting electric cylinder 133 is activated, it drives the two L-shaped adjusting plates 111 to move upward synchronously, so that the two adjusting slides 124 move upward synchronously. When the two adjusting slides 103 move relative to each other, the L-shaped adjusting plates 111 move relative to the piston rod end of the adjusting electric cylinder 133.

[0041] In the initial position, the spring between the limiting block 119 and the cross plate 115 is not compressed, driving the cross plate 115 to rotate. This causes one of the transfer slides 116 in the cross plate 115 to be parallel to the supporting square plate 110. The supporting square plate 110 is present on this transfer slide 116, and the groove on the supporting square plate 110 and the straight plate 117 on the transfer slide 116 connect to the opposite transfer slide 116, which is parallel to the supporting square plate 110 on the other side. There is no transfer slide 116 on this transfer slide 116. At this time, the position of the other cross plate 115 on the adjustable carriage 103 is the same as the position of the cross plate 115. Furthermore, on the two transfer slides 116 that are furthest apart on the same adjustable slide 103, there are supporting square plates 110. The grooves on the supporting square plates 110 engage with the straight plates 117 on the transfer slides 116. At this time, the supporting square plate 110 on one arm of one of the two cross plates 115 in the same adjustable slide 103 is located inside the conveyor belt 102. The cross plate 115 is located at the end of the conveyor belt 102 in the conveying direction. The transfer slide 116 on the other cross plate 115, which does not have a support arm, is located inside the conveyor belt 102. The cross plate 115 is located at the beginning of the conveyor belt 102 in the conveying direction.

[0042] When the transfer motor 131 is started, the cross plate 115 is driven to rotate 90 degrees. At this time, the supporting square plate 110 on the arm of one of the two cross plates 115 on the same adjustable slide 103 rotates to the inside of the conveyor belt 102, and the supporting square plate 110 on the arm of the other cross plate 115 rotates to the position furthest from the conveyor belt 102. At this time, the grooves on the corresponding limiting blocks 119 of the two transfer slides 116 parallel to the supporting square plate 110 are fully engaged with the arc-shaped strip 120. The limiting blocks 119 of the two transfer slides 116 parallel to the supporting square plate 110 disengage from contact with the fan-shaped strip 118. At this time, the other limiting blocks 119 and the fan-shaped strip 118 are engaged.

[0043] Then, the adjusting electric cylinder 133 is activated to drive the two L-shaped adjusting plates 111 to move upward synchronously, thereby causing the two adjusting carriages 124 to move upward synchronously, which in turn causes the four arc-shaped strips 120 to move upward synchronously, and consequently causes the corresponding four transfer slides 116 to move upward synchronously. The spring between the limiting block 119 and the cross rotating plate 115 is compressed, ultimately causing the upper surface of the moving transfer slide 116 and the lower surface of the supporting square plate 110 located between the supporting long strip 122 and the supporting long strip 2 123 to be on the same plane. The supporting square plate 110 of the moving transfer slide 116 contacts the adjacent supporting square plate 110, and the friction strip 121 on the supporting square plate 110 contacts the friction wheel 114. Then, the transfer slide 116 is activated again. The motor 129 drives the friction wheel 114 to rotate. Under the action of the friction wheel 114, the friction strip 121 moves along the conveying direction of the conveyor belt 102. The support square plate 110 slides relative to the straight plate 117, eventually causing the support square plate 110 to disengage from the straight plate 117. At this time, the support square plate 110, which is farthest from the support square plate 110 between the support long strip 122 and the support long strip 123 corresponding to the support square plate 110, engages with the straight plate 117 on another cross plate 115. Furthermore, the straight plate 117 on the transfer plate 116, which is farthest from the transfer plate 116 on the cross plate 115 corresponding to the transfer plate 116, engages with the moved support square plate 110.

[0044] Then, the adjustment cylinder 133 is activated, causing the adjustment slide 124 to move downward. Under the action of the spring between the limiting block 119 and the transfer slide 116, the corresponding transfer slide 116 moves downward synchronously. The transfer slide 116, which is repositioned with the supporting square plate 110, moves downward and engages with the cross rotating plate 115. Under the action of the cross rotating plate 115 and the straight plate 117, the supporting square plate 110 will not move during the transfer process.

[0045] By repeating the above steps, the support square plate 110 can be transferred from the tail end to the end end of the conveyor belt 102, thereby enabling the support square plate 110 to provide auxiliary support for the food box during the conveying process of the conveyor belt 102.

[0046] Working principle: Based on the size of the food box to be transported, the pitch motor 105 is started to adjust the distance between the two pitch carriages 103, that is, to adjust the distance between the two conveyor belts 102. Then, the transport motor 109 is started to drive the two conveyor belts 102 to rotate. While the conveyor belts 102 are rotating, the shift motor 129, the transfer motor 131, and the adjustment cylinder 133 are started, so that the support assembly and the transfer assembly cooperate to realize the transfer of the support square plate 110. This allows the support square plate 110 to move synchronously with the conveyor belts 102, placing the food box to be transported onto the conveyor belts 102 with the support square plate 110 underneath. The food box is then transported by the conveyor belts 102. The support square plate 110 provides auxiliary support for the conveyor belts 102 in transporting the food box, ensuring that the conveyor belts 102 can always transport the food box horizontally, thereby preventing damage to the food box during transport.

[0047] This invention is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort are within the protection scope of this invention.

Claims

1. A conveying device suitable for food boxes of different sizes, comprising a base plate (101), characterized in that: Adjustable slides (103) are symmetrically slidably mounted on the base plate (101). Each adjustable slide (103) is equipped with a transport component, a support component, and a transfer component. The transport component includes a transport belt (102). The support component includes two support strips (122) and two support strips (123). The two support strips (122) and two support strips (123) are symmetrically fixed on the adjustable slide (103). Multiple support square plates (110) are evenly arranged between the support strips (122) and the corresponding support strips (123). The support square plates (110) are used to support the inner side of the transport belt (102). The adjustable slide (103) also has... The rotating assembly is equipped with friction wheels (114), and friction strips (121) are fixedly provided on the supporting square plate (110). The friction wheels (114) and friction strips (121) are used to move the supporting square plate (110). The transfer assembly includes two symmetrically rotating cross plates (115) mounted on the adjustable slide (103). Transfer slides (116) are slidably mounted on the four arms of the cross plates (115). A straight plate (117) is fixedly provided on the transfer slides (116). The lower surface of the supporting square plate (110) is provided with a groove that cooperates with the straight plate (117). The cross plates (115) and transfer slides (116) are used to realize the transfer of the supporting square plate (110). The supporting square plate (110) is slidably engaged with the corresponding supporting long strip plate one (122) and supporting long strip plate two (123). When the supporting square plate (110) is located between supporting long strip plate one (122) and supporting long strip plate two (123), the two adjacent supporting square plates (110) are in contact. The supporting square plate (110) between supporting long strip plate one (122) and supporting long strip plate two (123) closest to the conveyor belt (102) is located directly below the inner side of the conveyor belt (102). The supporting square plate (110) is used to provide auxiliary support for the conveyor belt (102) when transporting items. When the friction strip (121) and the friction wheel (114) are in contact, there is friction between them. The friction strip (121) and the supporting square plate (110) have the same width. When the supporting square plate (110) is located between the supporting long strip one (122) and the supporting long strip two (123), the corresponding friction strip (121) is in contact with the adjacent friction strip (121). A limiting block (119) is fixedly installed on the lower surface of the transfer slide (116). A spring is installed between the limiting block (119) and the cross rotating plate (115). When the transfer slide (116) moves to the position furthest from the lower surface of the base plate (101), the upper surface of the transfer slide (116) and the lower surface of the supporting square plate (110) are on the same plane. The adjustable slide (103) is symmetrically fixed with fan-shaped strips (118) on both sides. The adjustable slide (103) is slidably mounted with a positioning slide (124). The positioning slide (124) is also symmetrically fixed with arc-shaped strips (120) on both sides. The fan-shaped strips (118) and arc-shaped strips (120) on the same side of the adjustable slide (103) are spaced apart. When the two fan-shaped strips (118) and two arc-shaped strips (120) on the same side of the adjustable slide (103) are joined together, a complete limiting ring plate is formed. The limiting round block (119) is provided with a sliding groove that cooperates with the limiting ring plate. The axis of the limiting ring plate and the center line of the cross rotating plate (115) are on the same straight line.

2. The conveying device for food boxes of different sizes according to claim 1, characterized in that: A double-ended threaded screw (106) is rotatably mounted on the base plate (101). The threads at both ends of the double-ended threaded screw (106) and the corresponding adjustable slide (103) form a helical pair. A drive shaft (104) is symmetrically rotatably mounted on the adjustable slide (103). A transport wheel (107) is fixedly mounted on the drive shaft (104). The transport belt (102) is set on the two corresponding transport wheels (107).

3. A conveying device suitable for food boxes of different sizes according to claim 2, characterized in that: The base plate (101) is also rotatably mounted with a double-headed spline shaft (108). Each of the two transport components has a drive shaft (104) and a double-headed spline shaft (108) forming a spline sliding fit. The two double-headed spline shafts (108) that form a spline sliding fit with the double-headed spline shaft (108) are arranged opposite to each other.

4. A conveying device suitable for food boxes of different sizes according to claim 3, characterized in that: A transmission group one is provided between two friction wheels (114) on the same adjustable slide (103), and a linkage group one is provided between the two transmission groups one. A transmission group two is provided between two cross rotating plates (115) on the same adjustable slide (103), and a linkage group two is provided between the two transmission groups two.

5. A conveying device suitable for food boxes of different sizes according to claim 4, characterized in that: L-shaped adjustment plates (111) are fixedly installed on the lower surface of the adjustment slide (124), and adjustment electric cylinders (133) are fixedly installed on the base plate (101). The L-shaped adjustment plates (111) slide in cooperation with the piston rod end of the adjustment electric cylinders (133).

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