Automatic feeding device for oil casing couplings

By designing an automatic loading device, using the telescopic mechanism and guide plate structure, the problem of coupling loading is not suitable for different sizes, the automatic conveying and stable positioning of couplings are achieved, and the loading efficiency is improved.

CN223087032UActive Publication Date: 2025-07-11JIANGSU CHANGBAO TAOBANG OIL PIPE FITTINGS CO LTD
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Patent Information

Application Number
CN202422116297.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-29
Publication Date
2025-07-11
Estimated Expiration
2034-08-29

AI Technical Summary

Technical Problem

The existing coupling loading mechanism cannot be adjusted according to the size of the coupling raw material, resulting in poor loading effect and manual adjustment of the coupling position during the loading process.

Method used

An automatic feeding device for oil casing couplings is designed, using two symmetrically arranged strip fixed plates and belt conveyors, and a step structure is formed through the first and second guide plates, combining the telescopic mechanism and push plate to realize automatic conveying and positioning of couplings of different sizes.

Benefits of technology

Automatic feeding of couplings of different sizes is achieved, loading efficiency is improved, manual intervention is reduced, and the coupling remains stable during the conveying process.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of feeding devices, in particular to an automatic oil casing coupling feeding device which comprises two strip-shaped fixing plates which are symmetrically arranged, the two strip-shaped fixing plates are fixed on one side of a base, a belt conveyor is installed on the top of the base, the tops of the two strip-shaped fixing plates extend to the position above the belt conveyor, and the two strip-shaped fixing plates are fixed on the belt conveyor. A second guide plate is installed at the end, close to the belt conveyor, between the two strip-shaped fixing plates, two first guide plates are further arranged between the two strip-shaped fixing plates, and a step structure is formed between the two first guide plates and the second guide plate. Gaps are formed between the first guide plates and between one of the first guide plates and the second guide plate, and push plates are arranged in the gaps. The distance between the two first guide plates and the distance between the first guide plates and the second guide plate can be adjusted through the first telescopic mechanism, so that couplings of different sizes can be conveyed, and the using effect is improved.
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Description

Technical Field

[0001] The utility model relates to the technical field of feeding devices, in particular to an automatic feeding device for oil casing couplings. Background Technique

[0002] When oilfield exploitation is carried out, different links such as the formation, well section, and bottom hole of the oilfield all need oil pipes and their connecting components to effectively realize the production, injection, and production processes of oil and gas wells, and the coupling can connect multiple sections of oil pipes together.

[0003] In the existing processing and production of couplings, generally, a feeding mechanism is required to convey raw materials to a conveying mechanism, and then the conveying mechanism conveys the raw materials to processing equipment for processing. However, in the feeding process of the existing feeding mechanism, since it cannot be adjusted according to the size of the coupling raw materials, it cannot feed different sizes of coupling raw materials, and the feeding effect is poor. And during the feeding process, the coupling raw materials will fall on the conveying mechanism in different postures, and manual adjustment by staff is still required, and the use effect is poor. For this reason, we propose an automatic feeding device for oil casing couplings. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the above-mentioned disadvantages in the existing technology, and propose an automatic feeding device for oil casing couplings.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme: design an automatic feeding device for oil casing couplings, including two symmetrically arranged strip-shaped fixing plates, the two strip-shaped fixing plates are fixed on one side of the base, and a belt conveyor is installed on the top of the base, and the tops of the two strip-shaped fixing plates extend above the belt conveyor;

[0006] A second guide plate is installed at one end close to the belt conveyor between the two strip-shaped fixing plates, and two first guide plates are also arranged between the two strip-shaped fixing plates. A stepped structure is formed between the two first guide plates and the second guide plate, and there are intervals between the two first guide plates and between one of the first guide plates and the second guide plate, and push plates are arranged in these intervals;

[0007] A number of pairs of through grooves are opened on the sides of the two strip-shaped fixing plates. Connecting blocks are installed on both sides of each first guide plate, one end of each connecting block penetrates through the corresponding through groove, and the top of each connecting block is connected to the strip-shaped fixing plate through a first telescopic mechanism;

[0008] Strip-shaped support plates are installed on one side of the bottoms of the two strip-shaped fixing plates, a second telescopic mechanism is installed on the top of the strip-shaped support plates, and two strip-shaped moving plates are slidably connected to one side of the two strip-shaped fixing plates, and one end of the second telescopic mechanism is connected to one of the strip-shaped moving plates;

[0009] Racks are installed on the adjacent surfaces of the two strip-shaped moving plates. One side of the two strip-shaped fixed plates close to the strip-shaped moving plates is rotatably connected with a rotating shaft. A gear is installed on the side surface of the rotating shaft. The gear is located between the two racks, and both racks are engaged with the gear;

[0010] At least one slider is installed on the bottom side of each push plate, and at least one slide rail is installed on the top of each strip-shaped moving plate. The bottom of each slider is slidably sleeved on the corresponding slide rail;

[0011] One side of the top of one of the strip-shaped fixed plates is provided with a connecting plate. A strip-shaped limiting plate is installed on the top of the connecting plate. One end of the strip-shaped limiting plate extends above the belt conveyor;

[0012] A strip-shaped groove is formed in the side surface of the connecting plate. A lead screw is arranged inside the strip-shaped groove. Both ends of the lead screw penetrate through the strip-shaped groove, and the bottom of the lead screw is fixed on the strip-shaped fixed plate. A locking nut sleeve is sleeved on the top of the lead screw. When the locking nut sleeve is tightened, the bottom of the locking nut sleeve abuts against the top of the connecting plate.

[0013] Preferably, at least one wedge-shaped strip is installed on one side of each push plate close to the corresponding first guide plate. Wedge-shaped grooves matching the wedge-shaped strips are formed on one side of the first guide plate close to the push plate. One side of each wedge-shaped strip extends into the corresponding wedge-shaped groove.

[0014] Preferably, both the first guide plate and the second guide plate are inclined, and the push plate is parallel to the first guide plate and the second guide plate.

[0015] Preferably, when the push plate is at the lowest end, the tops of the two push plates are flush with the tops of the corresponding first guide plates;

[0016] When the push plate is at the topmost end, the top of one of the push plates close to the second guide plate is flush with the second guide plate, and the top of the other push plate is flush with the top of the first guide plate close to the second guide plate.

[0017] Preferably, the strip-shaped limiting plate is inclined, and there is a gap between the bottom of the strip-shaped limiting plate and the top of the belt conveyor.

[0018] Preferably, both sides of the first guide plate and the push plate are in clearance fit with the side surface of the strip-shaped fixed plate.

[0019] Preferably, a number of pairs of legs are symmetrically installed on both sides of the bottom of the base, and the bottoms of the legs are flush with the bottom of the strip-shaped fixed plate.

[0020] Preferably, a hopper is installed on the side surface of one of the first guide plates far from the second guide plate, and the bottom end inside the hopper is flush with the top of the first guide plate.

[0021] Preferably, a control box is installed on one side of the bottom of the base, and the controller in the control box is connected to the first telescopic mechanism and the second telescopic mechanism respectively through wires.

[0022] The beneficial effects of the design scheme proposed by the present utility model in the application process are as follows:

[0023] 1. The distance between the two first guide plates and between the first guide plate and the second guide plate can be adjusted through the first telescopic mechanism, so that collars of different sizes can be conveyed, thereby improving the use effect.

[0024] 2. Through the cooperation of the push plate and the first guide plate, and the cooperation of the strip-shaped limiting plate and the belt conveyor, the collar can be kept in the same position when loading the collar, without the need for manual adjustment of the position of the collar by the staff, thus improving the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic connection structure diagram of the feeding device of the present utility model and the belt conveyor;

[0026] Figure 2 It is a schematic diagram of the feeding device of the present utility model Figure 1 ;

[0027] Figure 3 It is a schematic diagram of the feeding device of the present utility model Figure 2 ;

[0028] Figure 4 It is a schematic connection structure diagram between the second telescopic mechanism of the present utility model and two push plates.

[0029] In the figure: 1. Base; 2. Belt conveyor; 3. Strip-shaped support plate; 4. Connecting block; 5. Strip-shaped moving plate; 6. First guide plate; 7. Push plate; 8. Wedge-shaped strip; 9. Second guide plate; 10. Strip-shaped limiting plate; 11. Slide rail; 12. Hopper; 13. First telescopic mechanism; 14. Through groove; 15. Strip-shaped fixing plate; 16. Lead screw; 17. Connecting plate; 18. Locking nut; 19. Strip-shaped groove; 20. Second telescopic mechanism; 21. Slide block; 22. Wedge-shaped groove; 23. Leg; 24. Rotating shaft; 25. Gear; 26. Rack; 27. Control box. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0031] Refer to Figures 1 - 4, An automatic feeding device for oil casing couplings, including two symmetrically arranged strip-shaped fixing plates 15, the two strip-shaped fixing plates 15 are fixed on one side of the base 1, and a control box 27 is installed on one side of the bottom of the base 1. There is a controller inside the control box 27, and the controller is a control main board, either a host or a PLC logic controller.

[0032] As Figure 1 shown, a belt conveyor 2 is installed on the top of the base 1, and the tops of the two strip-shaped fixing plates 15 both extend above the belt conveyor 2. The couplings can be conveyed into the processing equipment through the belt conveyor 2 for processing.

[0033] As Figure 2 and Figure 3 shown, a second guide plate 9 is installed at one end of the two strip-shaped fixing plates 15 close to the belt conveyor 2, and two first guide plates 6 are also provided between the two strip-shaped fixing plates 15. A stepped structure is formed between the two first guide plates 6 and the second guide plate 9, and there are spaces between the two first guide plates 6 and between one of the first guide plates 6 and the second guide plate 9. A number of pairs of through grooves 14 are opened on the sides of the two strip-shaped fixing plates 15. Connecting blocks 4 are installed on both sides of each first guide plate 6. One end of each connecting block 4 penetrates through the corresponding through groove 14, and the top of each connecting block 4 is connected to the strip-shaped fixing plate 15 through a first telescopic mechanism 13. The first telescopic mechanism 13 is connected to the controller through a wire, and the first telescopic mechanism 13 is either an electric push rod or a hydraulic rod. In the actual use process, the controller can control the first telescopic mechanism 13 to work, and the first telescopic mechanism 13 can control the two first guide plates 6 to move along the through grooves 14 respectively, so that the distance between the two first guide plates 6 and the distance between the first guide plate 6 and the second guide plate 9 can be adjusted according to the diameter of the coupling.

[0034] As Figure 3 shown, a hopper 12 is installed on the side of one of the first guide plates 6 away from the second guide plate 9, and the bottom end inside the hopper 12 is flush with the top of the first guide plate 6. In the actual use process, the staff puts the couplings into the hopper 12, and under the action of gravity, the couplings will fall on the first guide plate 6, which is convenient for subsequent feeding.

[0035] As Figure 2 and Figure 3 shown, push plates 7 are provided in the spaces between the first guide plate 6 and the second guide plate 9 and between the two first guide plates 6. The first guide plate 6 and the second guide plate 9 are both inclined, and the push plates 7 are parallel to the first guide plate 6 and the second guide plate 9. In the actual use process, the push plates 7 can push the couplings along the first guide plate 6 and the second guide plate 9 onto the belt conveyor 2 for conveying.

[0036] It should be noted that asFigure 2 and Figure 3 As shown, at least one wedge strip 8 is installed on one side of each pusher plate 7 close to the corresponding first guide plate 6, and a wedge groove 22 matching the wedge strip 8 is formed on one side of the first guide plate 6 close to the pusher plate 7. One side of the wedge strip 8 extends into the corresponding wedge groove 22. With the cooperation of the wedge groove 22 and the wedge strip 8, the pusher plate 7 can be connected to the corresponding first guide plate 6, so that the pusher plate 7 can move following the movement of the first guide plate 6.

[0037] As Figure 4 shown, strip-shaped support plates 3 are installed at the bottoms of the two strip-shaped fixed plates 15 respectively. A second telescopic mechanism 20 is installed on the top of the strip-shaped support plate 3. The second telescopic mechanism 20 is connected to the controller through a wire, and the second telescopic mechanism 20 is one of a cylinder or a hydraulic rod. Two strip-shaped moving plates 5 are also slidably connected to one side of the two strip-shaped fixed plates 15, and one end of the second telescopic mechanism 20 is connected to one of the strip-shaped moving plates 5. Rack teeth 26 are installed on the adjacent surfaces of the two strip-shaped moving plates 5, and a rotating shaft 24 is rotatably connected to one side of the two strip-shaped fixed plates 15 close to the strip-shaped moving plates 5. A gear 25 is installed on the side surface of the rotating shaft 24. The gear 25 is located between the two rack teeth 26, and the two rack teeth 26 are both meshed with the gear 25. During actual use, the telescopic movement of the second telescopic mechanism 20 can drive one of the strip-shaped moving plates 5 to move, and then under the action of the gear 25 and the rack teeth 26, the two strip-shaped moving plates 5 can move in opposite directions.

[0038] As Figure 4 shown, at least one slider 21 is installed on one side of the bottom of each pusher plate 7, and at least one slide rail 11 is installed on the top of each strip-shaped moving plate 5. The bottom of each slider 21 is slidably sleeved on the corresponding slide rail 11. During actual use, when the second telescopic mechanism 20 pushes the strip-shaped moving plate 5 to move, the two pusher plates 7 will move in opposite directions. During the rising process of one of the pusher plates 7, the other pusher plate 7 moves downward, so that the two pusher plates 7 will not interfere with the lifting of the coupling, and when the first telescopic mechanism 13 moves, the slider 21 can move along the slide rail 11, so that the connection between the pusher plate 7 and the strip-shaped moving plate 5 will not be interfered.

[0039] It should be noted that when the pusher plate 7 is at the lowest end or the highest end, the tops of the two pusher plates 7 are flush with the tops of the corresponding first guide plates 6, so that the couplings in the hopper 12 will fall between the pusher plate 7 and the first guide plate 6 under the action of the pusher plate 7, which is convenient for the subsequent pusher plate 7 to jack up the couplings;

[0040] When the push plate 7 is at the topmost position, the top of one push plate 7 close to the second guide plate 9 is flush with the second guide plate 9, and the top of the other push plate 7 is flush with the top of the first guide plate 6 close to the second guide plate 9. When the push plate 7 moves to the topmost position, the coupling on the push plate 7 and the first guide plate 6 can be pushed to the top of the second guide plate 9 and fall onto the belt conveyor 2 under the action of gravity for conveying.

[0041] As Figure 1 shown, a connecting plate 17 is provided on one side of the top of one strip-shaped fixing plate 15, a strip-shaped limiting plate 10 is installed on the top of the connecting plate 17, and one end of the strip-shaped limiting plate 10 extends above the belt conveyor 2. During actual use, after the push plate 7 pushes the coupling onto the belt conveyor 2, the coupling will move along with the belt conveyor 2. When the coupling standing on the belt conveyor 2 contacts the strip-shaped limiting plate 10, the coupling can be pushed under the action of the strip-shaped limiting plate 10, so that the coupling can be kept in a tilted state during conveying.

[0042] It should be noted that, as Figure 1 shown, the strip-shaped limiting plate 10 is inclined, and there is a gap between the bottom of the strip-shaped limiting plate 10 and the top of the belt conveyor 2. In this way, the coupling pushed by the strip-shaped limiting plate 10 will fall back into the hopper 12 under the action of the strip-shaped limiting plate 10 and then be pushed onto the belt conveyor 2 again by the push plate 7.

[0043] As Figure 3 shown, a strip-shaped groove 19 is formed on the side surface of the connecting plate 17, a lead screw 16 is arranged inside the strip-shaped groove 19, both ends of the lead screw 16 penetrate through the strip-shaped groove 19, and the bottom of the lead screw 16 is fixed on the strip-shaped fixing plate 15. A locking nut 18 is sleeved on the top of the lead screw 16. When the locking nut 18 is tightened, the bottom of the locking nut 18 abuts against the top of the connecting plate 17. During actual use, through the cooperation of the strip-shaped groove 19 and the lead screw 16, the height of the strip-shaped limiting plate 10 can be adjusted according to the length of the coupling. After the adjustment is completed, the connecting plate 17 is fixed on the strip-shaped fixing plate 15 through the cooperation of the locking nut 18 and the lead screw 16, and then the strip-shaped limiting plate 10 is fixed.

[0044] Specifically, when the utility model is in use, when feeding collars of different sizes, the controller controls two pairs of first telescopic mechanisms 13 to drive two first guide plates 6 to move along the through groove 14, and under the action of the wedge-shaped strip 8 and the wedge-shaped groove 22, drives the push plates 7 corresponding to the first guide plates 6 to move. Thus, the distance between the two first guide plates 6 can be adjusted according to the size of the collar, and at the same time, the distance between the first guide plate 6 and the second guide plate 9 can also be adjusted. After the first guide plate 6 moves to the preset position, the operator places the collar into the hopper 12. Under the action of gravity, the collar will fall on the ends of the lowermost first guide plate 6 and the push plate 7. Then, the controller controls the second telescopic mechanism 20 to extend. The second telescopic mechanism 20 can push the strip-shaped moving plate 5 to move, and under the action of the gear 25 and the rack 26, the two push plates 7 move in opposite directions. The lower push plate 7 rises to push the collar in the hopper 12 towards the ends of the other push plate 7 and the first guide plate 6. Moreover, this push plate 7 only pushes up the collar lying horizontally or standing on the top of the first guide plate 6 and this push plate 7. When this push plate 7 rises to the top, the other push plate 7 moves down to the lowermost end. At this time, the collar pushed by the lower push plate 7 will fall on the ends of the other push plate 7 and the first guide plate 6. Then, the second telescopic mechanism 20 contracts, the upper push plate 7 rises, and the lower push plate 7 moves down. In this way, the rising push plate 7 pushes the collar at the ends of this push plate 7 and the first guide plate 6 towards the end of the second guide plate 9. And when this push plate 7 rises to the top, the collar pushed by this push plate 7 will fall into the belt conveyor 2 under the action of gravity for conveying. And during the conveying, the top of the standing collar will contact the strip-shaped limiting plate 10, and after being blocked by the strip-shaped limiting plate 10, it will fall back into the hopper 12. At the same time, the lower push plate 7 will move to the lowermost end. Then, control the second telescopic mechanism 20 to contract again. As described above, the collars in the hopper 12 can be conveyed onto the belt conveyor 2 for conveying to complete the feeding.

[0045] Furthermore, as Figure 2 shown, both sides of the first guide plate 6 and the push plate 7 are in clearance fit with the side surface of the strip-shaped fixing plate 15. In this way, the two strip-shaped fixing plates 15 limit the first guide plate 6 and the push plate 7, so that the first guide plate 6 and the push plate 7 are kept stable.

[0046] Furthermore, as Figure 1 shown, several pairs of legs 23 are symmetrically installed on both sides of the bottom of the base 1, and the bottoms of the legs 23 are flush with the bottom of the strip-shaped fixing plate 15. In this way, the bottom of the strip-shaped fixing plate 15 will abut against the ground to support the bottom of the strip-shaped fixing plate 15, making the connection between the strip-shaped fixing plate 15 and the base 1 more stable.

[0047] The above are only the preferred specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present utility model.

Claims

1. An automatic feeding device for oil casing couplings, comprising two symmetrically arranged strip-shaped fixing plates (15), characterized in that: Two strip-shaped fixing plates (15) are fixed to one side of the base (1), and a belt conveyor (2) is installed on the top of the base (1). The tops of the two strip-shaped fixing plates (15) extend above the belt conveyor (2). A second guide plate (9) is installed at one end close to the belt conveyor (2) between the two strip-shaped fixing plates (15). Two first guide plates (6) are also provided between the two strip-shaped fixing plates (15). A stepped structure is formed between the two first guide plates (6) and the second guide plate (9). Spaces are provided between the first guide plates (6) and between one of the first guide plates (6) and the second guide plate (9). Push plates (7) are provided in these spaces. A number of pairs of through grooves (14) are formed on the sides of the two strip-shaped fixing plates (15). Connecting blocks (4) are installed on both sides of each first guide plate (6). One end of each connecting block (4) penetrates through the corresponding through groove (14), and the top of each connecting block (4) is connected to the strip-shaped fixing plate (15) through a first telescopic mechanism (13). Strip-shaped support plates (3) are installed on one side of the bottom of the two strip-shaped fixing plates (15). A second telescopic mechanism (20) is installed on the top of the strip-shaped support plate (3). Two strip-shaped moving plates (5) are also slidably connected to one side of the two strip-shaped fixing plates (15). One end of the second telescopic mechanism (20) is connected to one of the strip-shaped moving plates (5). Racks (26) are installed on the adjacent surfaces of the two strip-shaped moving plates (5). A rotating shaft (24) is rotatably connected to one side of the two strip-shaped fixing plates (15) close to the strip-shaped moving plates (5). A gear (25) is installed on the side of the rotating shaft (24). The gear (25) is located between the two racks (26), and the two racks (26) are both engaged with the gear (25). At least one slider (21) is installed on one side of the bottom of each push plate (7). At least one slide rail (11) is installed on the top of each strip-shaped moving plate (5). The bottom of each slider (21) is slidably sleeved on the corresponding slide rail (11). A connecting plate (17) is provided on one side of the top of one of the strip-shaped fixing plates (15). A strip-shaped limiting plate (10) is installed on the top of the connecting plate (17). One end of the strip-shaped limiting plate (10) extends above the belt conveyor (2). A strip-shaped groove (19) is formed on the side of the connecting plate (17). A lead screw (16) is provided inside the strip-shaped groove (19). Both ends of the lead screw (16) penetrate through the strip-shaped groove (19), and the bottom of the lead screw (16) is fixed to the strip-shaped fixing plate (15). A locking nut (18) is sleeved on the top of the lead screw (16). When the locking nut (18) is tightened, the bottom of the locking nut (18) abuts against the top of the connecting plate (17).

2. The automatic feeding device for oil casing couplings according to claim 1, characterized in that: At least one wedge-shaped strip (8) is installed on one side of each push plate (7) close to the corresponding first guide plate (6). Wedge-shaped grooves (22) matching the wedge-shaped strips (8) are formed on one side of the first guide plate (6) close to the push plate (7). One side of the wedge-shaped strip (8) extends into the corresponding wedge-shaped groove (22).

3. An automatic feeding device for oil casing couplings according to claim 1, characterized in that: Both the first guide plate (6) and the second guide plate (9) are inclined, and the push plate (7) is parallel to the first guide plate (6) and the second guide plate (9).

4. An automatic feeding device for oil casing couplings according to claim 3, characterized in that: When the push plate (7) is at the lowest end, the tops of the two push plates (7) are flush with the tops of the corresponding first guide plates (6). When the push plate (7) is at the highest end, the top of one push plate (7) close to the second guide plate (9) is flush with the second guide plate (9), and the top of the other push plate (7) is flush with the top of the first guide plate (6) close to the second guide plate (9).

5. An automatic feeding device for oil casing couplings according to claim 1, characterized in that: The strip-shaped limit plate (10) is inclined, and there is a gap between the bottom of the strip-shaped limit plate (10) and the top of the belt conveyor (2).

6. The automatic feeding device for oil casing couplings according to claim 1, characterized in that: Both sides of the first guide plate (6) and the push plate (7) are in clearance fit with the side surfaces of the strip-shaped fixing plate (15).

7. An automatic feeding device for oil casing couplings according to claim 1, characterized in that: A number of pairs of legs (23) are symmetrically installed on both sides of the bottom of the base (1), and the bottoms of the legs (23) are flush with the bottom of the strip-shaped fixing plate (15).

8. An automatic feeding device for oil casing couplings according to claim 1, characterized in that: Among them, A hopper (12) is installed on the side surface of one first guide plate (6) far from the second guide plate (9), and the inner bottom end of the hopper (12) is flush with the top of the first guide plate (6).

9. The automatic feeding device for oil casing couplings according to claim 1, characterized in that: A control box (27) is installed on one side of the bottom of the base (1), and the controller in the control box (27) is connected to the first telescopic mechanism (13) and the second telescopic mechanism (20) respectively through wires.