Automatic destacking and stacking conveying method, system and application of component boxes

Through the automatic de-palletization and stacking conveying system, the pulley set and lever linkage and combined with cylinder control, the automatic splitting and stacking of component boxes is achieved, solving the problems of high labor costs and low production efficiency in the existing technology, and reducing transportation and handling Waste, improves productivity and prevents occupational diseases.

CN113581863BActive Publication Date: 2024-12-17TIANJIN FAW TOYOTA MOTOR CO LTD
View PDF 10 Cites 0 Cited by

Patent Information

Application Number
CN202110982016.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2021-08-25
Publication Date
2024-12-17
Estimated Expiration
2041-08-25

AI Technical Summary

Technical Problem

In the prior art, the handling of parts boxes is not automated enough, resulting in high labor costs, low production efficiency, easy to cause occupational diseases, and there is a waste of waiting and logistics transportation.

Method used

The automatic disassembly and stacking conveying system is adopted, and the splitting mechanism and pulley set are combined with inclined gravity and lever linkage to realize automatic splitting and stacking of the component box, and the up and down movement of the pallet is controlled through the cylinder to realize automatic transmission.

Benefits of technology

Eliminate transportation waste, improve production efficiency, reduce labor costs, prevent occupational diseases, and realize low-cost automated production.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN113581863B_ABST
    Figure CN113581863B_ABST
Patent Text Reader

Abstract

The present invention discloses a method, system and application for automatically destacking and stacking parts boxes, and relates to the field of automobile parts conveying technology. Parts to be stacked are split up and down by a splitting mechanism at the upper layer of a splitting and stacking area, and the split lower layer of the parts to be stacked are slid from the splitting and stacking area to the upper and lower transport frames of the upper and lower transport areas by their own tilting gravity in an inclined state; the upper and lower transport frames descend to the bottom, and the parts to be stacked are placed on the upper and lower transport area tilting pulley blocks installed in the upper and lower transport areas, and slide to the lower layer of the splitting and stacking area for temporary storage under the tilting gravity of the upper layer of the parts to be stacked; the parts boxes are redirected by their own weight, and the pulley blocks and levers are used to stack and return empty boxes on pallets. The present invention is connected by a pulley block, a lever and a connecting rod. It is transported by a semi-automatic door-type mechanism. It prevents occupational diseases, eliminates motion waste and transportation waste, and improves labor efficiency.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The present invention relates to the technical field of automobile parts conveying, and in particular to a method, system and application of automatic destacking and stacking conveying of parts boxes. Background Art

[0002] At present, parts boxes are heavy and the operation intensity is high. Parts are stacked too high and are inconvenient to pick up. Operators frequently bend over to return the boxes, which can easily cause occupational diseases and affect safe production. There is a lot of waiting waste and logistics transportation waste in the operations of picking up and stacking boxes, which leads to low labor productivity, increased working hours, and projects exceeding the cycle time.

[0003] Through the above analysis, the problems and defects of the prior art are as follows: In the prior art, the production efficiency cannot be further improved through automated handling equipment in the handling of component boxes, resulting in high labor costs. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the disclosed embodiment of the present invention provides a component box automatic destacking and stacking conveying system, automatic destacking and stacking conveying and application. Specifically, it relates to an automatic destacking and empty box stacking component shed. The technical solution is as follows:

[0005] According to a first aspect of an embodiment disclosed in the present invention, there is provided a method for automatically destacking, stacking and conveying component boxes, comprising:

[0006] Step 1: The parts to be stacked are split up and down by using a splitting mechanism at the upper layer of the splitting and stacking area, and the split parts to be stacked at the lower layer are slid from the splitting and stacking area to the upper and lower transport frames of the upper and lower transport areas by using their own tilting gravity in an inclined state; at this time, the split parts to be stacked at the upper layer are moved to the position of the parts to be stacked at the lower layer by using the splitting mechanism, waiting to slide to the upper and lower transport areas;

[0007] The upper and lower transport frames descend to the bottom, and the parts to be stacked are placed on the upper and lower transport area inclined pulley block installed in the upper and lower transport area. Under the inclined gravity of the parts to be stacked, the parts slide to the lower layer of the splitting and stacking area, and the damping structure of the lower layer of the splitting and stacking area is used to temporarily block the parts to be stacked in the lower layer.

[0008] Step 2: The upper and lower transport frames at the lower part of the splitting and stacking area move upward to the upper layer of the splitting and stacking area;

[0009] At the same time, the upper layer of the parts to be stacked waiting to slide to the upper and lower transport area in step 1 are in an inclined state, using their own inclined gravity to slide from the splitting and stacking area to the upper and lower transport frame running there, and the upper and lower transport frame descends to the bottom, and the parts to be stacked are placed on the upper and lower transport area inclined pulley block installed in the upper and lower transport area, and slide to the lower layer of the splitting and stacking area for temporary storage under the inclined gravity of the upper layer of the parts to be stacked; while the upper layer of the parts to be stacked slides to the lower layer of the splitting and stacking area, the lower layer of the parts to be stacked temporarily stored in step 1 are synchronously moved upward for a distance using the splitting mechanism and are located above the upper layer of the parts to be stacked;

[0010] Step 3: After the stacking of the components to be stacked is completed in step 1 to step 2, the damping structure of the lower layer of the split stacking area is opened, and the stacked components to be stacked are slid to the output area by their own tilting gravity;

[0011] Step 4: Repeat steps 1 to 3 to complete the stacking of the multi-layer components to be stacked.

[0012] In one embodiment of the present invention, in step 1, the upper layer of the splitting and stacking area uses the installed splitting and stacking area inclined pulley group to slide the split lower layer of the to-be-stacked parts from the splitting and stacking area to the upper and lower transport frames of the upper and lower transport areas;

[0013] The rear end of the splitting and superimposing area inclined pulley block is higher than the front end in contact with the upper and lower transport areas.

[0014] In one embodiment of the present invention, in step 2, the rear end of the inclined pulley block in the upper and lower transport areas is higher than the front end in contact with the splitting and overlapping area.

[0015] In one embodiment of the present invention, the automatic destacking and stacking and conveying method of component boxes includes: utilizing the component box's own gravity to slide downward obliquely to the splitting area, and the splitting mechanism utilizes the pulley lever to block the rear component box from sliding toward the splitting area, and after the splitting action is completed, the rear component box again utilizes its own gravity to slide into the splitting area, and the split component box slides into the pallet. After use, the pallet is controlled by a cylinder to slide downward to the output area, and the component box utilizes its own gravity to slide obliquely into the input area, and the pulley and lever of the stacking mechanism are used to block the component box from staying in the lower splitting and overlapping area. After the stacking operation is completed, the cylinder is controlled to control the component box to slide out of the output area obliquely using its own gravity.

[0016] According to a second aspect of the disclosed embodiment of the present invention, there is provided a component box automatic destacking and stacking conveying system, comprising:

[0017] A splitting mechanism is used to split the parts to be stacked into upper and lower layers at the upper layer of the splitting and stacking area;

[0018] The inclined pulley block in the splitting and stacking area is used to slide the split parts to be stacked from the splitting and stacking area to the upper and lower transport frames of the upper and lower transport areas in an inclined state by using their own inclined gravity;

[0019] The upper and lower transport frames are used to slide the parts to be stacked freely from the upper part to the lower part of the upper and lower transport areas;

[0020] The inclined pulley block in the upper and lower transport areas is used to slide the parts to be stacked to the lower layer of the splitting and stacking area under their own inclined gravity;

[0021] The damping structure at the bottom of the split stacking area is used to temporarily block the parts to be stacked.

[0022] In one embodiment of the present invention, the lower layer of the splitting and stacking area is also equipped with a splitting and stacking area lower layer inclined pulley group, which is used to slide the stacked parts to be stacked to the output area by their own inclined gravity.

[0023] In one embodiment of the present invention, the splitting mechanism comprises:

[0024] Control gas path;

[0025] The split cylinder is connected to the control air circuit to control the downward movement of the cylinder;

[0026] A split plate, connected to the split cylinder, is used to split the stacked parts;

[0027] The rope chain pulley block is used to drive the control air circuit, split cylinder, and split plate to move up and down in the split overlapping area.

[0028] In one embodiment of the present invention, the automatic destacking and stacking conveying system for component boxes further comprises:

[0029] The splitting mechanism control gas circuit is used to control the up and down movement of the splitting mechanism;

[0030] The upper and lower transport frame control air path is used to control the upper and lower transport frame to move up and down;

[0031] The damping structure of the lower layer of the split superposition area controls the air path, and is used to control the opening and closing of the damping structure of the lower layer of the split superposition area.

[0032] In one embodiment of the present invention, the splitting mechanism control air path, the upper and lower transport frame control air path, and the damping structure of the lower layer of the split overlapping area are connected to the automatic operation controller through corresponding electromagnetic control structures.

[0033] According to a third aspect of the disclosed embodiment of the present invention, there is provided an application of the automatic destacking, stacking and conveying method for component boxes in the transportation of components in the automotive field and in the transportation of goods in a logistics warehouse.

[0034] The technical solution provided by the embodiments disclosed in the present invention may have the following beneficial effects:

[0035] The present invention further improves production efficiency by eliminating transportation waste and thoroughly implementing standard operations through Karacool improvements and low-cost automation.

[0036] The component box destacking and stacking conveying device of the present invention is linked by a pulley group, a lever, and a connecting rod combination (destacking and stacking are linked to achieve automation), thereby preventing occupational diseases, eliminating motion waste and transportation waste, improving labor efficiency, and greatly reducing costs through a self-made low-cost mechanism.

[0037] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0039] Figure 1 The present invention is a schematic diagram of the structure of a component box automatic destacking and stacking conveying system provided in an embodiment of the present invention.

[0040] Figure 1 Middle: 1. Place the parts to be stacked; 2. Split the mechanism; 3. Split the tilt pulley block in the stacking area.

[0041] Figure 2 The invention is a block diagram of a component box automatic destacking, stacking and conveying system provided by an embodiment of the present invention.

[0042] Figure 2 In: 2. Splitting mechanism; 2-1. Control air circuit; 2-2. Splitting cylinder; 2-3. Splitting plate; 2-4. Rope chain pulley block; 3. Splitting the inclined pulley block of the overlapping area; 4. Upper and lower transport frames; 5. Upper and lower transport area inclined pulley blocks; 6. Splitting the damping structure of the lower layer of the overlapping area; 7. Splitting the inclined pulley block of the lower layer of the overlapping area; 8. Splitting mechanism control air circuit; 9. Upper and lower transport frames control air circuit; 10. Splitting the damping structure control air circuit of the lower layer of the overlapping area; 11. Automatic operation controller.

[0043] Figure 3 The present invention is a flowchart of a method for automatically destacking, stacking and conveying component boxes provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0045] like Figure 1-Figure 2 As shown, the automatic destacking, stacking and conveying system for component boxes provided by the disclosed embodiment of the present invention uses an independently manufactured automated mechanism to split multi-layer components at the splitting point, and uses a cylinder to drive a rope chain pulley group to move the splitting mechanism and the pallet up and down to split the component boxes.

[0046] Specifically, the automatic destacking and stacking conveying system for component boxes includes:

[0047] A splitting mechanism 2 is used to split the components 1 to be stacked into upper and lower layers at the upper layer of the splitting and stacking area;

[0048] The inclined pulley block 3 in the splitting and stacking area is used to slide the split parts to be stacked from the splitting and stacking area to the upper and lower transport frames of the upper and lower transport areas by using their own inclined gravity in an inclined state;

[0049] The upper and lower transport frames 4 are used to slide the parts to be stacked freely from the upper part to the lower part of the upper and lower transport areas;

[0050] The inclined pulley group 5 in the upper and lower transport areas is used to slide the parts to be stacked to the lower layer of the splitting and stacking area under their own inclined gravity;

[0051] The damping structure 6 at the lower layer of the split stacking area is used to temporarily block the components to be stacked.

[0052] In one embodiment of the present invention, the lower layer of the splitting and stacking area is also equipped with a splitting and stacking area lower layer inclined pulley group 7, which is used to slide the stacked parts to be stacked to the output area by using their own inclined gravity.

[0053] In one embodiment of the present invention, the splitting mechanism 2 comprises:

[0054] Control gas circuit 2-1;

[0055] Split cylinder 2-2 and connect it to the control gas circuit to control the downward movement of the cylinder;

[0056] The splitting plate 2-3 is connected to the splitting cylinder and is used to split the stacked parts;

[0057] The rope chain pulley block 2-4 is used to drive the control air circuit, the splitting cylinder and the splitting plate to move up and down in the splitting overlapping area.

[0058] In one embodiment of the present invention, the automatic destacking and stacking conveying system for component boxes further comprises:

[0059] The splitting mechanism control gas circuit 8 is used to control the up and down movement of the splitting mechanism;

[0060] The upper and lower transport frame control air path 9 is used to control the upper and lower transport frame to move up and down;

[0061] The damping structure control air path 10 of the lower layer of the split overlapping area is used to control the opening and closing of the damping structure of the lower layer of the split overlapping area.

[0062] In one embodiment of the present invention, the splitting mechanism control air path 8, the upper and lower transport frame control air path 9, and the damping structure 10 of the lower layer of the split overlapping area are connected to the automatic operation controller 11 through corresponding electromagnetic control structures.

[0063] As Figure 3 As shown, the present invention provides a method for automatically destacking, stacking and conveying component boxes, comprising:

[0064] S101, the parts to be stacked are split up and down in the upper layer of the splitting and stacking area by using a splitting mechanism, and the split parts to be stacked in the lower layer are slid from the splitting and stacking area to the upper and lower transport frames of the upper and lower transport areas by using their own tilting gravity in an inclined state; at this time, the split parts to be stacked in the upper layer are moved to the position of the parts to be stacked in the lower layer by using the splitting mechanism, waiting to slide to the upper and lower transport areas;

[0065] The upper and lower transport frames descend to the bottom, and the parts to be stacked are placed on the upper and lower transport area inclined pulley block installed in the upper and lower transport area. Under the inclined gravity of the parts to be stacked, the parts slide to the lower layer of the splitting and stacking area, and the damping structure of the lower layer of the splitting and stacking area is used to temporarily block the parts to be stacked in the lower layer.

[0066] S102, the upper and lower transport frames at the lower part of the splitting and stacking area move upward to the upper layer of the splitting and stacking area;

[0067] At the same time, in step S101, the upper layer of the parts to be stacked waiting to slide to the upper and lower transport area slides from the splitting and stacking area to the upper and lower transport frame running there in an inclined state by using its own inclined gravity, and the upper and lower transport frame descends to the bottom, and the parts to be stacked are placed on the upper and lower transport area inclined pulley block installed in the upper and lower transport area, and slide to the lower layer of the splitting and stacking area for temporary storage under the inclined gravity of the upper layer of the parts to be stacked; while the upper layer of the parts to be stacked slides to the lower layer of the splitting and stacking area, the lower layer of the parts to be stacked temporarily stored in step 1 synchronously ascends a distance by using the splitting mechanism and is located above the upper layer of the parts to be stacked;

[0068] S103, after the stacking of the components to be stacked is completed through steps S101 to S102, the damping structure of the lower layer of the split stacking area is opened, and the stacked components to be stacked are slid to the output area by their own tilting gravity;

[0069] S104, repeating steps S101 to S103 to complete the stacking of the multi-layer components to be stacked.

[0070] In the step S101, the upper layer of the splitting and stacking area uses the installed splitting and stacking area inclined pulley group to slide the split lower layer of the to-be-stacked parts from the splitting and stacking area to the upper and lower transport frames of the upper and lower transport areas;

[0071] The rear end of the splitting and superimposing area inclined pulley block is higher than the front end in contact with the upper and lower transport areas.

[0072] In step S102, the rear end of the inclined pulley block in the upper and lower transport areas is higher than the front end in contact with the splitting and overlapping area.

[0073] Preferably, the present invention manufactures the mechanism through mechanical principles, and then utilizes a pulley block to enable the mechanism to move up and down, and each time the mechanism moves up and down, a box of parts is retained and automatically flows into the empty pallet.

[0074] The pulley block uses the lever principle to drive the slide tray up and down, flowing into and out of the parts box for splitting operations.

[0075] The rotating pallet is made through mechanical principles, and the principle of gravity is used to make the component boxes flow into the pallet. At the same time, the weight of the component boxes causes the pallet to change direction, thereby changing the direction in which the component boxes flow into the pallet.

[0076] Preferably, the automatic destacking and stacking and conveying method of component boxes further includes: utilizing the component box's own gravity to slide downward obliquely to the splitting area, and the splitting mechanism utilizes the pulley and lever linkage to block the rear component box from sliding toward the splitting area, and after the splitting action is completed, the rear component box again utilizes its own gravity to slide into the splitting area, and the split component box slides into the pallet, and after use is completed, the cylinder is used to control the pallet to slide downward to the output area, and the component box utilizes its own gravity to slide obliquely into the input area, and the pulley and lever of the stacking mechanism are used to block the component box from staying in the lower splitting and overlapping area, and after the stacking operation is completed, the cylinder is used to control the component box to utilize its own gravity to slide out of the output area at an angle.

[0077] The technical solution of the present invention is further described below in combination with the effects.

[0078] The present invention realizes high-efficiency and low-cost manufacturing of products. The present invention uses a self-made low-cost automated mechanism to split multi-layer parts at the splitting point, and uses a simple unpowered pulley to drive the lever to move the slide up and down to split the parts box. The weight of the parts box is used to change the direction of inflow, and the pulley and lever are used to realize the stacking and return of empty boxes on the pallet.

[0079] The present invention realizes automation through the linkage of pulley blocks, levers and connecting rods (destacking and stacking are linked to achieve automation, that is, an automatic destacking and stacking conveying system for component boxes is provided).

[0080] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the disclosure disclosed herein. This application is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0081] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure should be limited by the appended claims.

Claims

1. A method for automatically unstacking and stacking component boxes, characterized in that: The automatic destacking and stacking conveying system for parts boxes used in the automatic destacking and stacking conveying method for parts boxes includes: A splitting mechanism is used to split the parts to be stacked into upper and lower layers at the upper layer of the splitting and stacking area; The inclined pulley block in the splitting and stacking area is used to slide the split parts to be stacked from the splitting and stacking area to the upper and lower transport frames of the upper and lower transport areas in an inclined state by using their own inclined gravity; The upper and lower transport frames are used to slide the parts to be stacked freely from the upper part to the lower part of the upper and lower transport areas; The inclined pulley block in the upper and lower transport areas is used to slide the parts to be stacked to the lower layer of the splitting and stacking area under their own inclined gravity; Split the damping structure at the bottom of the stacking area to temporarily block the parts to be stacked; The lower layer of the splitting and stacking area is also equipped with a splitting and stacking area lower layer inclined pulley group, which is used to slide the stacked parts to be stacked to the output area by using their own inclined gravity; The splitting mechanism comprises: Control gas path; The split cylinder is connected to the control air circuit to control the downward movement of the cylinder; A split plate, connected to the split cylinder, is used to split the stacked parts; The rope chain pulley block is used to drive the control gas circuit, splitting cylinder, and splitting plate to move up and down in the splitting and overlapping area; The automatic destacking and stacking conveying system for component boxes further comprises: The splitting mechanism control gas circuit is used to control the up and down movement of the splitting mechanism; The upper and lower transport frame control air path is used to control the upper and lower transport frame to move up and down; The damping structure of the lower layer of the split superposition area controls the air path, which is used to control the opening and closing of the damping structure of the lower layer of the split superposition area; The splitting mechanism control gas path, the upper and lower transport frame control gas path, and the damping structure of the lower layer of the split overlapping area are connected to the automatic operation controller through corresponding electromagnetic control structures; The automatic destacking, stacking and conveying method for component boxes comprises: Step 1: The parts to be stacked are split up and down by using a splitting mechanism at the upper layer of the splitting and stacking area, and the split parts to be stacked at the lower layer are slid from the splitting and stacking area to the upper and lower transport frames of the upper and lower transport areas by using their own tilting gravity in an inclined state; at this time, the split parts to be stacked at the upper layer are moved to the position of the parts to be stacked at the lower layer by using the splitting mechanism, waiting to slide to the upper and lower transport areas; The upper and lower transport frames descend to the bottom, and the parts to be stacked are placed on the upper and lower transport area inclined pulley block installed in the upper and lower transport area. Under the inclined gravity of the parts to be stacked, the parts slide to the lower layer of the splitting and stacking area, and the damping structure of the lower layer of the splitting and stacking area is used to temporarily block the parts to be stacked on the lower layer. Step 2: The upper and lower transport frames at the lower part of the splitting and stacking area move upward to the upper layer of the splitting and stacking area; At the same time, the upper layer of the parts to be stacked waiting to slide to the upper and lower transport area in step 1 are in an inclined state, using their own inclined gravity to slide from the splitting and stacking area to the upper and lower transport frame running there, and the upper and lower transport frame descends to the bottom, and the parts to be stacked are placed on the upper and lower transport area inclined pulley block installed in the upper and lower transport area, and slide to the lower layer of the splitting and stacking area for temporary storage under the inclined gravity of the upper layer of the parts to be stacked; while the upper layer of the parts to be stacked slides to the lower layer of the splitting and stacking area, the lower layer of the parts to be stacked temporarily stored in step 1 are synchronously moved upward for a distance using the splitting mechanism and are located above the upper layer of the parts to be stacked; Step 3: After the stacking of the components to be stacked is completed through steps 1 to 2, the damping structure of the lower layer of the split stacking area is opened, and the stacked components to be stacked are slid to the output area by their own tilting gravity; Step 4, repeating steps 1 to 3 to complete the stacking of the multi-layer components to be stacked; In the step 1, the upper layer of the splitting and stacking area uses the installed splitting and stacking area inclined pulley group to slide the split lower layer of the to-be-stacked parts from the splitting and stacking area to the upper and lower transport frames of the upper and lower transport areas; The rear end of the inclined pulley block in the splitting and superimposing area is higher than the front end in contact with the upper and lower transport areas; In the step 2, the rear end of the inclined pulley block in the upper and lower transport areas is higher than the front end in contact with the splitting and overlapping area.

2. The automatic destacking and stacking method for component boxes according to claim 1 is characterized in that: The component box automatic destacking, stacking and conveying method also includes: The component box uses its own gravity to slide downward to the splitting area, and the splitting mechanism uses the pulley lever to block the rear component box from sliding toward the splitting area. After the splitting action is completed, the rear component box uses its own gravity to slide into the splitting area again, and the split component box slides into the pallet. After use, the cylinder is used to control the pallet to slide downward to the output area, and the component box uses its own gravity to slide into the input area. The pulley and lever of the stacking mechanism are used to block the component box from staying in the lower splitting and stacking area. After the stacking operation is completed, the cylinder is used to control the component box to use its own gravity to slide out of the output area.

3. An application of the automatic destacking, stacking and conveying method for component boxes according to any one of claims 1 to 2 in the transportation of components in the automotive field and in the transportation of goods in logistics warehouses.

Citation Information

Patent Citations

  • Method for destacking and stacking boxes and mechanisms and devices for implementing method

    CN103662851A

  • Article box unstacking and stacking device

    CN110395582A

  • Article divides buttress equipment

    CN206447304U

  • Feeding device and automobile production line

    CN209536254U

  • Oil tank conveying device

    CN210479987U