Belt conveying line of symmetrical structure

Abstract

The invention relates to the technical field of logistics conveying, and discloses a symmetrical structure belt conveying line which comprises a warehouse-out box throwing belt conveying line and a plurality of warehouse-out conveying devices arranged on the outer side of the warehouse-out box throwing belt conveying line. And the conveying directions of the two pieces of warehouse-out conveying equipment located at the adjacent positions are opposite, and forward rotation or reverse rotation is controlled in real time in an electrical control mode. According to the invention, a plurality of warehouse-out conveying devices are arranged at the re-checking packaging and box-throwing position to form a belt conveying line with a mutually symmetrical structure, and in the subsequent combined use process with a main sorting conveying line, an inner re-checking narrow-band conveying line, a sorting inlet code reader and other structures, the conveying lines can be used according to different business forms; order turnover boxes in two operation states are conveyed to corresponding warehouse-out positions at the same time by flexibly adjusting the forward and reverse rotation states of the symmetrical structure belt conveying line, and the use flexibility of equipment in a rechecking packaging area is improved.

Description

Technical Field

[0001] This invention relates to the field of logistics conveying technology, specifically to a symmetrical belt conveyor line. Background Technology

[0002] With the rapid development of e-commerce sales of pharmaceuticals, the demand for individuals to purchase medicines online is also increasing. Pharmaceutical logistics centers typically handle both e-commerce orders and commercial sales orders during the sales process. E-commerce orders generally involve fewer types and quantities of medicines, resulting in smaller packages per order, but a larger number of packages. Commercial sales orders, on the other hand, involve more types and quantities of medicines, usually packaged in large cardboard boxes, resulting in larger packages. However, during the outbound process, the packing and verification workstations for both e-commerce and commercial orders are located in the same area, sharing a single outbound conveyor belt. After the packages for both e-commerce and commercial orders are packed, they are placed onto the outbound conveyor belt, which then transports both types of packages out of the warehouse.

[0003] However, after the aforementioned two types of outbound order packages are checked and packaged, the packing staff places the packages onto the long conveyor belt for outbound delivery. This conveyor belt operates in the same direction, transporting the packages out of the warehouse. During this process, e-commerce packages, being smaller, tend to pile up and obstruct the larger commercial order packages when transported together. This increases the frequency of box jams on the conveyor belt, severely impacting outbound efficiency. Summary of the Invention

[0004] This invention provides a symmetrical belt conveyor line, which solves the problems mentioned in the background art.

[0005] This invention provides the following technical solution: a symmetrical belt conveyor line, comprising an outbound box-collecting belt conveyor line and several outbound conveying devices. The several outbound conveying devices are arranged outside the outbound box-collecting belt conveyor line, and two adjacent outbound conveying devices have opposite conveying directions, controlled in real-time by electrical control to rotate forward or backward. The main sorting conveyor line includes an inner verification narrow belt conveyor line, a sorting entrance barcode reader, a first lifting transfer machine, a non-powered roller conveyor line, a stainless steel workbench, and back-end equipment. The back-end equipment includes a warehouse equipment control system and an inventory management system. The equipment is wirelessly connected to the barcode reader at the sorting entrance. The material conveying channel of the main sorting conveyor is connected to the material conveying channel of the inner verification narrow belt conveyor and can transport plastic turnover boxes from the zero-goods area to the inner verification narrow belt conveyor. Several unpowered roller slides are arranged laterally along one side of the inner verification narrow belt conveyor, and the material conveying channel of the unpowered roller slides is connected to the material conveying channel of the inner verification narrow belt conveyor. Several first lifting and transferring machines are arranged and installed on the inner verification narrow belt conveyor and can transfer the plastic turnover boxes transported by the inner verification narrow belt conveyor to the plastic channel of the unpowered roller slides.

[0006] The preferred outbound conveying equipment includes a supporting body, and a conveyor belt is fitted on the top of the supporting body. Auxiliary support rollers installed on the corresponding sides of the top of the supporting body are installed on both sides of the conveyor belt. A power component for driving the conveyor belt is provided in the middle of the supporting body. The power component is installed inside the supporting body and includes a first tensioning wheel and two second tensioning wheels that are respectively fitted and driven by the conveyor belt. The first tensioning wheel is composed of a first wheel body and a first drive shaft fitted on the inner side of the middle of the first wheel body. One end of the first drive shaft is fitted with a bearing seat installed on the top of the supporting body through a bearing.

[0007] The second tensioning wheel consists of a second wheel body and a second drive shaft fitted inside the middle of the second wheel body. A sliding groove is opened on the side wall of the top of the support body to engage with one end of the second drive shaft. A servo electric cylinder push rod installed on the inner wall of the top of the support body is connected to the surface of one end of the second drive shaft. The second tensioning wheels in relative positions can be adjusted to be close to or far apart under the drive of their respective servo electric cylinder push rods. The other end of the first tensioning wheel is connected to a reduction motor installed on the top of the support body. A first photoelectric switch is installed on the support body.

[0008] The selected inner-core narrow belt conveyor line consists of three narrow belts, a geared motor, a chain, a chain disc, a steel frame, a first tensioning wheel, and a second photoelectric switch.

[0009] Specifically, the sorting inlet barcode reader is located outside the inner verification narrow belt conveyor line and is fixedly connected to a bracket. The plastic turnover box is equipped with a digital barcode that can be read by the sorting inlet barcode reader. After reading the digital barcode, the sorting inlet barcode reader can transmit the relevant data to the inventory management system in the background equipment, so that the inventory management system can distribute the plastic turnover box with a sliding sleeve.

[0010] Preferably, the first lifting and transfer machine is located below the inner verification narrow belt conveyor line, and the lifting output structure inside the first lifting and transfer machine can be movably connected with the gap of the inner verification narrow belt conveyor line itself without interfering with the output operation of the inner verification narrow belt conveyor line.

[0011] The selected non-powered roller slide line consists of a first aluminum profile body, a first roller, and a third photoelectric switch, and is inclined at a five-degree angle. The non-powered roller slide line can store at least four plastic turnover boxes.

[0012] Specifically, a full-load detection photoelectric switch is installed at the connection between the first aluminum profile body in the non-powered roller slide line and the steel body in the inner verification narrow belt conveyor line, and the full-load detection photoelectric switch can detect whether the non-powered roller slide line is fully loaded.

[0013] Preferably, the stainless steel workbench is composed of a steel support frame and a stainless steel tabletop, and the length of the stainless steel tabletop is twice the width of the first aluminum profile body within the non-powered roller slide line. Furthermore, a single stainless steel workbench can be used in combination with two non-powered roller slide lines.

[0014] Specifically, the outer side of the inner core narrow belt conveyor line is provided with a turnover box roller return line that communicates with its own material conveying channel. A second lifting and transferring machine is provided between the turnover box roller return line and the inner core narrow belt conveyor line at the opposite end. The second lifting and transferring machine, the turnover box roller return line and the inner core narrow belt conveyor line form a complete circular return route, so that the plastic turnover boxes can be circulated and transported until they are distributed to the corresponding unpowered roller slide line. The turnover box roller return line is composed of a motor, a wheel, a first multi-groove belt, a second aluminum profile body, a second tensioning wheel and a fourth photoelectric switch.

[0015] Specifically, the outbound conveying equipment is equipped with an empty turnover box roller recycling line below it. The empty turnover box roller recycling line consists of a geared motor, a second multi-groove belt, a second roller, a third aluminum profile body, and a fifth photoelectric switch. The empty turnover box roller recycling line can provide a recycling and conveying channel for the empty plastic turnover boxes after verification.

[0016] The present invention has the following beneficial effects:

[0017] 1. This invention forms a symmetrical belt conveyor line by setting up several outbound conveying devices at the review and packaging box-delivery point. In subsequent use in combination with the main sorting conveyor line, the inner review narrow belt conveyor line, and the sorting entrance barcode reader, the forward and reverse states of the symmetrical belt conveyor line can be flexibly adjusted according to different business patterns to simultaneously transport order turnover boxes in two different operating states to the corresponding outbound positions. This increases the flexibility of equipment use in the review and packaging area and avoids the uneven stress and conveyor line damage caused by the forward and reverse rotation of ordinary belt conveyor lines.

[0018] 2. This invention enables the outbound conveyor equipment corresponding to the commercial order parcel packing station to output in the forward direction, while the outbound conveyor equipment corresponding to the e-commerce small parcel packing station outputs in the reverse direction, so that they are respectively transported to the corresponding outbound positions. This prevents box jams caused by mixing the two types of parcels and improves the overall outbound efficiency. Furthermore, when there is only one type of operation, either commercial orders or e-commerce orders, the belt conveyor line formed by several outbound conveyor equipment can be adjusted to the same direction for centralized and efficient outbound processing.

[0019] 3. During continuous use, the outbound conveying equipment of this invention can adjust the conveying state of its own conveyor belt by driving the corresponding second tensioning wheel at the output end of the two servo electric cylinder push rods. This ensures continuous transmission efficiency and transmission accuracy by tightening the conveyor belt itself without interfering with the reciprocating rotation output of the conveyor belt. Attached Figure Description

[0020] Figure 1 This is a top view of the structure of the present invention;

[0021] Figure 2 This is a partially enlarged schematic diagram of the structure of the present invention;

[0022] Figure 3 This is a partially enlarged schematic diagram of the outbound conveying equipment of the present invention;

[0023] Figure 4 This is a cross-sectional schematic diagram of the outbound conveying equipment of the present invention.

[0024] In the diagram: 1. Main sorting conveyor line; 2. Inner verification narrow belt conveyor line; 3. Sorting entrance barcode reader; 4. First lifting and transfer machine; 5. Non-powered roller conveyor line; 6. Stainless steel workbench; 7. Outbound conveyor equipment; 71. Support body; 72. Conveyor belt; 73. Auxiliary support rollers; 74. First tension roller; 75. Second tension roller; 76. Gear motor; 77. Servo electric cylinder push rod; 8. Turnover box roller return line; 9. Empty turnover box roller recycling line; 10. Second lifting and transfer machine; 11. Back-end equipment. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1

[0027] Please see Figures 1-4 A symmetrical belt conveyor line includes an outbound box-collecting belt conveyor line and several outbound conveying devices 7. The several outbound conveying devices 7 are arranged outside the outbound box-collecting belt conveyor line, and the conveying directions of two outbound conveying devices 7 in adjacent positions are opposite and are controlled to rotate forward or backward in real time by electrical control.

[0028] The outbound conveying equipment 7 includes a support body 71, and a conveyor belt 72 is fitted on the top of the support body 71. Auxiliary support rollers 73 are installed on the corresponding sides of the top of the support body 71 on both sides of the conveyor belt 72. A power component that drives the conveyor belt 72 is provided in the middle of the support body 71. The power component is installed inside the support body 71 and includes a first tensioning wheel 74 and two second tensioning wheels 75 that are respectively fitted and driven by the conveyor belt 72. The first tensioning wheel 74 is composed of a first wheel body and a first drive shaft fitted on the inner side of the middle of the first wheel body. One end of the first drive shaft is fitted with a bearing seat installed on the top of the support body 71 through a bearing, which ensures the structural strength of itself while improving the stability of the transmission.

[0029] The second tensioning wheel 75 consists of a second wheel body and a second drive shaft fitted inside the middle of the second wheel body. A sliding groove is opened on the side wall of the top of the support body 71 to engage with one end of the second drive shaft. A servo electric cylinder push rod 77 installed on the inner wall of the top of the support body 71 is connected to the surface of one end of the second drive shaft. The second tensioning wheels 75 in the relative position can be adjusted to be close or far apart under the transmission of their respective servo electric cylinder push rods 77, thereby ensuring the transmission efficiency and position accuracy of the conveyor belt 72 during continuous use. The other end of the first tensioning wheel 74 is connected to a geared motor 76 installed on the top of the support body 71 to meet the motion requirements. A first photoelectric switch is installed on the support body 71.

[0030] The main sorting conveyor line 1 includes an inner verification narrow belt conveyor line 2, a sorting entrance barcode reader 3, a first lifting transfer machine 4, a non-powered roller slide line 5, a stainless steel workbench 6, and a back-end equipment 11. The back-end equipment 11 is equipped with a warehouse equipment control system and an inventory management system, and the back-end equipment 11 is wirelessly connected to the sorting entrance barcode reader 3.

[0031] The material conveying channel of the main sorting conveyor line 1 is connected to the material conveying channel of the inner verification narrow belt conveyor line 2 and can transport plastic turnover boxes from the zero-goods area to the inner verification narrow belt conveyor line 2. Several unpowered roller slide lines 5 are arranged laterally along one side of the inner verification narrow belt conveyor line 2, and the material conveying channel of the unpowered roller slide lines 5 is connected to the material conveying channel of the inner verification narrow belt conveyor line 2. Several first lifting transfer machines 4 are arranged and installed on the inner verification narrow belt conveyor line 2 and can transfer the plastic turnover boxes transported by the inner verification narrow belt conveyor line 2 to the plastic channel of the unpowered roller slide lines 5.

[0032] The carefully selected, internally verified narrow belt conveyor line 2 consists of three narrow belts, a geared motor, a chain, a chain disc, a steel body, a first tensioning wheel, and a second photoelectric switch. This satisfies the conveying requirements while providing space for the subsequent lifting and lowering operations of the first lifting and transferring machine 4, thus avoiding structural interference.

[0033] The sorting entrance barcode reader 3 is located outside the inner verification narrow belt conveyor line 2 and is fixedly connected to a bracket. The plastic turnover boxes are equipped with digital barcodes that can be read by the sorting entrance barcode reader 3. After reading the digital barcodes, the sorting entrance barcode reader 3 can transmit the relevant data to the inventory management system in the back-end equipment 11, so that the inventory management system can distribute the plastic turnover boxes by sliding sleeves, thereby improving the overall intelligent use effect of the equipment and improving the work efficiency. The first lifting transfer machine 4 is located below the inner verification narrow belt conveyor line 2, and the lifting output structure inside the first lifting transfer machine 4 can be movably connected with the gap of the inner verification narrow belt conveyor line 2 itself without interfering with the output operation of the inner verification narrow belt conveyor line 2. Thus, the first lifting transfer machine 4 works in conjunction with the inner verification narrow belt conveyor line 2 to distribute the plastic turnover boxes to the corresponding non-powered roller slide line 5 for temporary storage, reducing the waiting time of the staff and further improving the work efficiency.

[0034] The non-powered roller conveyor 5 consists of a first aluminum profile body, a first roller, and a third photoelectric switch, and is tilted at a five-degree angle to facilitate the smooth sliding of the temporarily stored plastic turnover boxes to the corresponding stainless steel workbench 6. The non-powered roller conveyor 5 can hold at least four plastic turnover boxes, ensuring its own turnover efficiency. A full-load detection photoelectric switch is installed at the connection between the first aluminum profile body and the steel body of the inner verification narrow belt conveyor 2 inside the non-powered roller conveyor 5. The full-load detection photoelectric switch can detect whether the non-powered roller conveyor 5 is fully loaded, thereby avoiding overload and improving the reliability and stability of the overall equipment during continuous operation. The stainless steel workbench 6 consists of a steel support and a stainless steel tabletop. The length of the stainless steel tabletop is twice the width of the first aluminum profile body inside the non-powered roller conveyor 5. A single stainless steel workbench 6 can be used in combination with two non-powered roller conveyor lines 5, thereby achieving a one-for-two usage effect and reducing the cost of use in terms of structural materials.

[0035] When in use, firstly, there are two main categories of medicines that enter the review and sorting process: one is commercial retail orders and the other is e-commerce retail orders. After the retail picking area is completed, they are loaded into plastic turnover boxes and flow into the main sorting conveyor line 1 and other structural work areas. Commercial retail orders and e-commerce retail orders will be issued in waves, and the corresponding barcodes have been affixed to the plastic turnover boxes.

[0036] As commercial and e-commerce retail boxes enter the main sorting conveyor line 1 and are conveyed to the inner verification narrow belt conveyor line 2, they will be scanned at the sorting entrance barcode reader 3. After the barcode is read, the inventory management system will allocate the chutes. The commercial retail boxes will be arranged on the first section of the chutes of the main sorting conveyor line 1 for sorting, and the e-commerce retail boxes will be arranged on the second section of the chutes of the main sorting conveyor line 1 for sorting, until the inner verification narrow belt conveyor line 2 and several first lifting transfer machines 4 set on the inner verification narrow belt conveyor line 2 will sort the commercial and e-commerce retail boxes onto several non-powered roller chute lines 5 respectively.

[0037] After the commercial and e-commerce retail turnover boxes are sorted, the packing personnel, using the stainless steel workbench 6 as support, take out the retail items from the commercial or e-commerce retail turnover boxes one by one and scan them according to the order information displayed on the computer. After scanning and verification, they are put into empty cardboard boxes to complete the consolidation and packing. The packed commercial retail turnover boxes are placed on the corresponding outbound conveyor 7 at the first stage, and the corresponding outbound conveyor 7 outputs them in a forward direction to transport them out of the warehouse. Similarly, the packed e-commerce retail turnover boxes are placed on the corresponding outbound conveyor 7 at the last stage for reverse transmission and outbound in another direction.

[0038] When business operations are adjusted and the tote boxes entering the main sorting conveyor line 1 contain only commercial orders or e-commerce orders, these tote boxes will still be sorted to their respective chutes according to the above steps. The packing personnel will then complete the scanning and packing of the boxes. After that, the operation mode will be switched, and multiple outbound conveyor devices 7 will be adjusted to run in the same direction for outbound. For example, when all the tote boxes are commercial orders, multiple outbound conveyor devices 7 will jointly move forward for outbound; when all the tote boxes are e-commerce orders, multiple outbound conveyor devices 7 will jointly move backward for outbound.

[0039] When the conveyor belt 72 inside the outbound conveyor 7 becomes loose during continuous use, which leads to transmission slippage or a decrease in transmission accuracy, the two servo electric cylinder push rods 77 can be activated. The output ends of the two servo electric cylinder push rods 77 drive their respective second tensioning wheels 75 to make similar adjustments, thereby tightening the conveyor belt 72 without interfering with the reciprocating rotation output of the conveyor belt 72.

[0040] Example 2

[0041] Please see Figures 1-2 The outer side of the inner verification narrow belt conveyor line 2 is provided with a turnover box roller return line 8 that is connected to its own material conveying channel. A second lifting and transferring machine 10 is provided between the turnover box roller return line 8 and the inner verification narrow belt conveyor line 2 at the opposite end. The second lifting and transferring machine 10, the turnover box roller return line 8 and the inner verification narrow belt conveyor line 2 form a complete loop return route, so that the plastic turnover boxes can be circulated and transported until they are distributed to the corresponding non-powered roller slide line 5. The turnover box roller return line 8 is composed of a motor, a wheel, a first multi-groove belt, a second aluminum profile body, a second tensioning wheel and a fourth photoelectric switch.

[0042] In use, during the process of the inner verification narrow belt conveyor line 2 and the several first lifting and transferring machines 4 set on the inner verification narrow belt conveyor line 2 distributing commercial retail order turnover boxes and e-commerce retail order turnover boxes to several non-powered roller slide lines 5, some of the emptied plastic turnover boxes will be re-entered into the material conveying channel of the inner verification narrow belt conveyor line 2 in a cyclical conveying manner under the cooperation of the turnover box roller return line 8 and the second lifting and transferring machine 10, to continue the subsequent distribution and verification operations.

[0043] Example 3

[0044] Please see Figures 1-2 Below the outbound conveyor 7, there is an empty turnover box roller recycling line 9, which consists of a geared motor, a second multi-groove belt, a second roller, a third aluminum profile body, and a fifth photoelectric switch. The empty turnover box roller recycling line 9 can provide a recycling and conveying channel for the empty plastic turnover boxes after verification.

[0045] During use, when the staff in the verification area are verifying the work, they will put some empty turnover boxes onto the empty turnover box roller recycling line 9, which will then collect and transport them to the existing retail area for easy reuse. The empty turnover box roller recycling line 9 is arranged in a ring between the verification area and the existing retail area.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Additionally, in the accompanying drawings of this invention, the fill patterns are merely for distinguishing layers and do not constitute any other limitation.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A symmetrical belt conveyor line, comprising an outbound box-collecting belt conveyor line and several outbound conveying devices (7), characterized in that: Several outbound conveying devices (7) are arranged outside the outbound box conveyor belt, and the conveying directions of two outbound conveying devices (7) in adjacent positions are opposite and are controlled in real time to rotate forward or reverse by electrical control. The main sorting conveyor line (1) includes an inner verification narrow belt conveyor line (2), a sorting entrance barcode reader (3), a first lifting transfer machine (4), a non-powered roller slide line (5), a stainless steel workbench (6), and a back-end device (11). The back-end device (11) is equipped with a warehouse equipment control system and an inventory management system, and the back-end device (11) is wirelessly connected to the sorting entrance barcode reader (3). The material conveying channel of the main sorting conveyor line (1) is connected to the material conveying channel of the inner verification narrow belt conveyor line (2) and can transport plastic turnover boxes from the zero-goods area to the inner verification narrow belt conveyor line (2). The non-powered roller slide line (5) is set up in several units and arranged laterally along one side of the inner verification narrow belt conveyor line (2). The material conveying channel of the non-powered roller slide line (5) is connected to the material conveying channel of the inner verification narrow belt conveyor line (2). The first lifting transfer machine (4) is set up in several units arranged and installed on the inner verification narrow belt conveyor line (2) and can transfer the plastic turnover boxes transported by the inner verification narrow belt conveyor line (2) to the plastic channel of the non-powered roller slide line (5).

2. The symmetrical belt conveyor line according to claim 1, characterized in that: The outbound conveying equipment (7) includes a support body (71), and a conveyor belt (72) is fitted on the top of the support body (71). Auxiliary support rollers (73) installed on the corresponding sides of the top of the support body (71) are installed on both sides of the conveyor belt (72). A power component for driving the conveyor belt (72) is provided in the middle of the support body (71). The power component is installed inside the support body (71). The power component includes a first tensioning wheel (74) and two second tensioning wheels (75) that are respectively fitted and driven by the conveyor belt (72). The first tensioning wheel (74) is composed of a first wheel body and a first drive shaft fitted on the inner side of the middle of the first wheel body. One end of the first drive shaft is fitted with a bearing seat installed on the top of the support body (71) through a bearing. The second tensioning wheel (75) is composed of a second wheel body and a second drive shaft fitted inside the middle of the second wheel body. The side wall of the top of the support body (71) is provided with a sliding groove that engages with one end of the second drive shaft. The surface of one end of the second drive shaft is connected to a servo electric cylinder push rod (77) mounted on the inner wall of the top of the support body (71). The second tensioning wheels (75) in relative positions can be adjusted to be close or far apart under the transmission of their respective servo electric cylinder push rods (77). The other end of the first tensioning wheel (74) is connected to a reduction motor (76) mounted on the top of the support body (71). A first photoelectric switch is installed on the support body (71).

3. The symmetrical belt conveyor line according to claim 1, characterized in that: The inner verification narrow belt conveyor (2) consists of three narrow belts, a geared motor, a chain, a chain disc, a steel body, a first tensioning wheel, and a second photoelectric switch.

4. A symmetrical belt conveyor line according to claim 1, characterized in that: The sorting inlet barcode reader (3) is located outside the inner verification narrow strip conveyor line (2) and is fixedly connected to a bracket. The plastic turnover box is provided with a digital barcode that can be read by the sorting inlet barcode reader (3). After reading the digital barcode, the sorting inlet barcode reader (3) can transmit the relevant data to the inventory management system in the background equipment (11) so that the inventory management system can distribute the plastic turnover box.

5. A symmetrical belt conveyor line according to claim 1, characterized in that: The first lifting transfer machine (4) is located below the inner verification narrow belt conveyor line (2), and the lifting output structure inside the first lifting transfer machine (4) can be dynamically connected with the gap of the inner verification narrow belt conveyor line (2) itself without interfering with the output operation of the inner verification narrow belt conveyor line (2).

6. A symmetrical belt conveyor line according to claim 1, characterized in that: The unpowered roller slide (5) consists of a first aluminum profile body, a first roller, and a third photoelectric switch, and is inclined at a five-degree angle. At least four plastic turnover boxes can be stored on the unpowered roller slide (5).

7. A symmetrical belt conveyor line according to claim 6, characterized in that: A full-load detection photoelectric switch is provided at the connection between the first aluminum profile body inside the non-powered roller slide line (5) and the steel body inside the inner verification narrow belt conveyor line (2), and the full-load detection photoelectric switch can detect whether the non-powered roller slide line (5) is fully loaded.

8. A symmetrical belt conveyor line according to claim 6, characterized in that: The stainless steel workbench (6) is composed of a steel support and a stainless steel tabletop. The length of the stainless steel tabletop is twice the width of the first aluminum profile body in the non-powered roller slide line (5). A single stainless steel workbench (6) can be used in combination with two non-powered roller slide lines (5).

9. A symmetrical belt conveyor line according to claim 1, characterized in that: The outer side of the inner verification narrow belt conveyor line (2) is provided with a turnover box roller return line (8) that is connected to its own material conveying channel. A second lifting transfer machine (10) is provided between the turnover box roller return line (8) and the inner verification narrow belt conveyor line (2) at the opposite end. The second lifting transfer machine (10), the turnover box roller return line (8) and the inner verification narrow belt conveyor line (2) form a full circle circulation return route, so that the plastic turnover boxes can be circulated and transported until they are assigned to the corresponding non-powered roller slide line (5). The turnover box roller return line (8) is composed of a motor, a wheel, a first multi-groove belt, a second aluminum profile body, a second tensioning wheel and a fourth photoelectric switch.

10. A symmetrical belt conveyor line according to claim 1, characterized in that: Below the outbound conveying equipment (7) is an empty turnover box roller recycling line (9), which is composed of a geared motor, a second multi-groove belt, a second roller, a third aluminum profile body, and a fifth photoelectric switch. The empty turnover box roller recycling line (9) can provide a recycling and conveying channel for the empty plastic turnover boxes after verification.

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