Feeding structure for automatically conveying bubble pipes

Abstract

A feeding structure for automatically conveying bubble pipes comprises a feeding structure body, and the feeding structure body comprises an outer frame and a feeding part. A fixing plate is installed at the front end of the outer frame. A mounting frame is fixed to the left end of the fixing plate. A first motor is mounted at the rear end of the mounting frame. A rotating block is fixed to an output shaft of the first motor. And a receiving hole is formed in the rotating block. A first air cylinder and an ejector rod are fixed to the top end of the mounting frame. A conveying belt is arranged between the fixing plate and the outer frame. A transfer table is installed at the front end of the fixing plate. A transfer groove is formed in the top end of the transfer table. A second cylinder and a push rod are mounted on the transfer table. And a first optical fiber sensor is arranged on the push rod. A first support, a third air cylinder and a conveying block are installed at the left end of the outer frame. A containing groove is formed in the bottom end of the conveying block. According to the feeding structure, the overall structure of the feeding structure body is simplified, so that the feeding structure body is easier to assemble, and the cost is lower.

Description

Technical Field

[0001] The utility model relates to the technical field related to building measurement level rulers, in particular to a feeding structure for automatically conveying bubble tubes. Background Art

[0002] The applicant previously applied for and authorized a utility model patent with the authorization announcement number CN217076085U, which is an automatic feeding structure for a fully automatic filling device for a level ruler bubble tube, including an automatic feeding structure and an ejection structure; the automatic feeding structure includes an outer frame, a feeding part, a conveying part, a part to be processed, an angle adjustment part and an ejection part; the outer frame includes a base plate, a first side plate, a second side plate and a third side plate; the part to be processed includes a placement block, a first push block, a first optical fiber sensor and a first cylinder; the feeding part includes a second cylinder, a rectangular lifting plate and a rectangular fixed plate; the conveying part includes a first motor, a conveyor belt, a driving wheel and a driven wheel; the ejection part includes a third cylinder, a mounting seat and a second push block; the angle adjustment part includes a servo electric cylinder, a guide rail, a sliding seat, a second motor and a rotating block; the ejection structure includes a support seat, an ejection block and a fourth cylinder. The utility model can complete the automatic feeding of the bubble tube and automatically place the bubble tube in the bubble tube fixing hole, saving time and effort and having high work efficiency.

[0003] However, the structures of the conveying part, the part to be processed, the angle adjustment part and the pushing part in the utility model are complicated, which makes the assembly of the utility model inconvenient and the overall cost increases, so there is still room for improvement. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of the utility model is to provide a feeding structure for automatically conveying bubble tubes, aiming to simplify the overall structure of the feeding structure body without affecting the convenience of automatically conveying bubble tubes, thereby making the feeding structure body easier to assemble and reducing costs.

[0005] A feeding structure for automatically conveying bubble tubes, comprising a feeding structure body, the feeding structure body comprising an outer frame and a feeding part, a front end of the outer frame is equipped with a fixing plate extending laterally left and right, a left end of the fixing plate extends beyond the outer frame and is fixed with a mounting frame, a rear end of the mounting frame is equipped with a first motor, an output shaft of the first motor passes horizontally forward through the mounting frame and is fixed with a rotating block, the rotating block is located directly above the bubble tube fixing hole of an external filling device, a receiving hole extending laterally left and right and passing through the rotating block is provided on the rotating block, a groove is provided on the hole wall of the receiving hole, a spherical pressing block is provided in the groove, a spring is fixedly connected between one end of the spherical pressing block and the groove bottom of the groove, and the other end of the spherical pressing block passes through the groove, an extension frame extending forward is fixed to the top of the mounting frame, a first cylinder is installed on the top of the extension frame, a piston rod of the first cylinder passes vertically downward through the extension frame and is fixed with an ejector rod corresponding to the receiving hole;

[0006] A gap is reserved between the fixed plate and the outer frame, and two transmission wheels are rotatably connected in the gap through a rotating shaft, and a conveyor belt is transmission-connected between the two transmission wheels, and the top of the conveyor belt is flush with the feeding part and the top of the fixed plate, and a second motor for driving one of the transmission wheels to rotate is installed on the right side of the front end of the fixed plate, and a transfer table is installed on the left side of the front end of the fixed plate, and a transfer groove corresponding to the receiving hole and located directly in front of the conveyor belt is opened at the top of the transfer table, and the left end of the transfer groove passes through the transfer table, and a second cylinder is installed on the right outer wall of the transfer table, and the piston rod of the second cylinder penetrates into the transfer groove and is fixed with a push rod, and an installation groove is opened at the center position of the left end of the push rod, and a first optical fiber sensor is installed in the installation groove, and the first optical fiber sensor is electrically connected to the first motor through a PLC controller;

[0007] A first bracket is installed at the left end of the outer frame, a third cylinder is installed at the rear end of the first bracket, a piston rod of the third cylinder passes through the first bracket and is fixed with a conveying block, and a placement groove located above the conveyor belt is opened at the bottom end of the conveying block.

[0008] By adopting the above technical solution, when the feeding part conveys the bubble tube to the conveyor belt, the second motor is started, and the output shaft of the second motor rotates to drive one of the transmission wheels to rotate, and the transmission wheel drives the other transmission wheel to rotate through the conveyor belt, and the conveyor belt starts to run. The bubble tube moves to the placement slot as the conveyor belt runs. Then the third cylinder is started, and the piston rod of the third cylinder extends to drive the conveying block to move forward, and the conveying block drives the bubble tube forward. When the placement slot is located directly above the transfer slot, the bubble tube falls out of the placement slot and falls into the transfer slot under the action of its own gravity.

[0009] Then the second cylinder is started, and the piston rod of the second cylinder extends to drive the push rod to move to the left, and the push rod pushes the bubble tube out of the transfer slot and into the receiving hole. When the bubble tube is pushed into the receiving hole, it presses on the arc surface of the spherical pressing block, and the spherical pressing block is pressed into the groove, and the spring is compressed to form a rebound force. Under the action of the rebound force of the spring, the spherical pressing block presses the bubble tube into the receiving hole.

[0010] While the push rod pushes the bubble tube, the first optical fiber sensor determines the opening direction of the bubble tube. If the opening of the bubble tube faces the first optical fiber sensor, the first optical fiber sensor transmits a signal to the PLC controller, and the PLC controller controls the output shaft of the first motor to rotate 90 degrees counterclockwise, driving the rotating block to rotate, so that the opening of the bubble tube faces upward. If the opening of the bubble tube faces away from the first optical fiber sensor, the first optical fiber sensor transmits a signal to the PLC controller, and the controller controls the output shaft of the first motor to rotate 90 degrees clockwise, driving the rotating block to rotate, so that the opening of the bubble tube faces upward. Regardless of how the rotating block rotates, the receiving hole is vertically extended up and down after rotation, and can be passed through by the ejection rod.

[0011] Then the first cylinder is started, and the piston rod of the first cylinder drives the ejection rod to move downward. The ejection block is inserted into the receiving hole to push the bubble tube out and into the bubble tube fixing hole.

[0012] The utility model can complete the automatic feeding of the bubble tube and automatically place the bubble tube in the bubble tube fixing hole, which saves time and labor, has high work efficiency, and simplifies the overall structure of the feeding structure body, so that the feeding structure body is easier to assemble and has lower cost.

[0013] The utility model is further configured as follows: a limiting plate is fixed on the top of the fixing plate, a gap is reserved between the limiting plate and the mounting frame for the conveying block to pass through, and the front end of the first bracket is in contact with the conveying belt and is higher than the conveying belt.

[0014] By adopting the above technical solution, the limiting plate and the first bracket jointly play the role of limiting the bubble tube, thereby preventing the bubble tube from falling off the conveyor belt when the conveyor belt moves.

[0015] Further configuration of the utility model: an inverted L-shaped adjustment plate is installed on the top of the limit plate, a plurality of strip-shaped through grooves are opened on the top of the inverted L-shaped adjustment plate, a plurality of threaded countersunk holes corresponding to the strip-shaped through grooves are opened on the top of the limit plate, fastening bolts are passed through the strip-shaped through grooves and the threaded countersunk holes, and the bottom end of the inverted L-shaped adjustment plate is in contact with the top of the conveyor belt.

[0016] By adopting the above technical solution, the fastening bolts are screwed out, and different parts of the strip-shaped through groove correspond to the threaded countersunk holes, so that the position of the inverted L-shaped adjustment plate can be adjusted, thereby adjusting the distance between the L-shaped adjustment plate and the first bracket according to the width of the bubble tube, ensuring that the bubble tubes move one by one in a horizontally extending state.

[0017] The utility model is further configured as follows: a second optical fiber sensor is installed on the limit plate, a through hole corresponding to the second optical fiber sensor is opened on the inverted L-shaped adjustment plate, and the second optical fiber sensor is electrically connected to the feeding part through a PLC controller.

[0018] By adopting the above technical solution, the second optical fiber sensor is used to detect whether there are sufficient bubble tubes on the conveyor belt. If the second optical fiber sensor does not detect the bubble tubes, it means that there are insufficient bubble tubes on the conveyor belt, and the feeding part starts to transport the bubble tubes in the frame to the conveyor belt. If the second optical fiber sensor detects the bubble tubes, it means that there are sufficient bubble tubes on the conveyor belt, and the feeding part is closed to avoid excessive accumulation of bubble tubes on the conveyor belt.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] 1. The utility model can complete the automatic feeding of the bubble tube and automatically place the bubble tube in the bubble tube fixing hole, which saves time and labor, has high work efficiency, and simplifies the overall structure of the feeding structure body, so that the feeding structure body is easier to assemble and has lower cost.

[0021] 2. The utility model can adjust the distance between the L-shaped adjustment plate and the first bracket according to the width of the bubble tube, so as to ensure that the bubble tubes move one by one in a horizontally extending state. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a feeding structure for automatically conveying bubble tubes in the utility model. Figure 1 ;

[0023] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0024] Figure 3 for Figure 1 The enlarged view of point B in the middle;

[0025] Figure 4 This is a schematic diagram of the structure of a feeding structure for automatically conveying bubble tubes in the utility model. Figure 2 ;

[0026] Figure 5 for Figure 4 Enlarged view of point C in the middle;

[0027] Figure 6 It is a structural schematic diagram of an inverted L-shaped adjustment plate of a feeding structure for automatically conveying bubble tubes according to the utility model;

[0028] Figure 7 It is a cross-sectional view of a rotating block of a feeding structure for automatically conveying bubble tubes according to the utility model;

[0029] Figure 8 The utility model is a cross-sectional view of a transfer table of a feeding structure for automatically conveying bubble tubes.

[0030] Figure numerals: 1. outer frame; 2. feeding part; 3. fixing plate; 4. mounting frame; 5. first motor; 6. rotating block; 7. receiving hole; 8. groove; 9. spherical clamping block; 10. spring; 11. extension frame; 12. first cylinder; 13. ejector rod; 14. conveyor belt; 15. second motor; 16. limit plate; 17. inverted L-shaped adjustment plate; 18. strip through groove; 19. threaded countersunk hole; 20. second optical fiber sensor; 21. through hole; 22. transfer table; 23. transfer slot; 24. second cylinder; 25. push rod; 26. mounting slot; 27. first optical fiber sensor; 28. first bracket; 29. ​​third cylinder; 30. conveying block; 31. placement slot. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] A feeding structure for automatically conveying bubble tubes, such as Figure 1-Figure 8 As shown, it includes a feeding structure body, and the feeding structure body includes an outer frame 1 and a feeding part 2. This embodiment is an improvement on the automatic feeding structure of a utility model patent with authorization announcement number CN217076085U for a fully automatic filling device for a level ruler bubble tube. Therefore, the structures of the outer frame 1 and the feeding part 2 can refer to the relevant description in the utility model patent with authorization announcement number CN217076085U for a fully automatic filling device for a level ruler bubble tube, and will not be described in detail in this embodiment.

[0033] A fixing plate 3 extending laterally left and right is installed at the front end of the outer frame 1 .

[0034] The left end of the fixed plate 3 extends beyond the outer frame 1 and is fixed with a mounting frame 4. A first motor 5 is installed at the rear end of the mounting frame 4. The output shaft of the first motor 5 passes through the mounting frame 4 horizontally and forward and is fixed with a rotating block 6. The rotating block 6 is located directly above the bubble tube fixing hole of the external filling equipment. The rotating block 6 is provided with a receiving hole 7 that extends horizontally to the left and right and passes through the rotating block 6. A groove 8 is provided on the hole wall of the receiving hole 7. A spherical clamping block 9 is arranged in the groove 8. A spring 10 is fixedly connected between one end of the spherical clamping block 9 and the bottom of the groove 8. The other end of the spherical clamping block 9 passes through the groove 8. An extension frame 11 extending forward is fixed to the top of the mounting frame 4. A first cylinder 12 is installed at the top of the extension frame 11. The piston rod of the first cylinder 12 passes through the extension frame 11 vertically downward and is fixed with an ejector rod 13 corresponding to the receiving hole 7.

[0035] There is a gap (not shown in the figure) between the fixed plate 3 and the outer frame 1. Two transmission wheels (not shown in the figure) are rotatably connected in the gap through a rotating shaft, that is, the rotating shaft is rotatably connected between the fixed plate 3 and the outer frame 1 through a bearing, and the transmission wheel is fixedly sleeved on the outside of the rotating shaft. A conveyor belt 14 is transmission-connected between the two transmission wheels. The top of the conveyor belt 14 is flush with the top of the feeding part 2 and the fixed plate 3. A second motor 15 for driving one of the transmission wheels to rotate is installed on the right side of the front end of the fixed plate 3.

[0036] A limiting plate 16 is fixed to the top of the fixed plate 3. A gap is reserved between the limiting plate 16 and the mounting frame 4 (not shown in the figure). An inverted L-shaped adjustment plate 17 is installed on the top of the limiting plate 16. A plurality of strip-shaped through grooves 18 are provided at the top of the inverted L-shaped adjustment plate 17. A plurality of threaded countersunk holes 19 corresponding to the strip-shaped through grooves 18 are provided at the top of the limiting plate 16. Fastening bolts (not shown in the figure) are passed through the strip-shaped through grooves 18 and the threaded countersunk holes 19. The bottom end of the inverted L-shaped adjustment plate 17 fits with the top of the conveyor belt. A second optical fiber sensor 20 is installed on the limiting plate 16, and a through hole 21 corresponding to the second optical fiber sensor 20 is provided on the inverted L-shaped adjustment plate 17. The second optical fiber sensor 20 is electrically connected to the feeding part 2 through a PLC controller.

[0037] A transfer table 22 is installed on the left side of the front end of the fixed plate 3. A transfer slot 23 corresponding to the receiving hole 7 and located directly in front of the conveyor belt and corresponding to the gap is opened at the top of the transfer table 22. The left end of the transfer slot 23 passes through the transfer table 22. A second cylinder 24 is installed on the right outer wall of the transfer table 22. The piston rod of the second cylinder 24 penetrates into the transfer slot 23 and is fixed with a push rod 25. An installation slot 26 is opened at the center position of the left end of the push rod 25. A first optical fiber sensor 27 is installed in the installation slot 26. The first optical fiber sensor 27 is electrically connected to the first motor 5 through a PLC controller.

[0038] A first bracket 28 is installed at the left end of the outer frame 1. The front end of the first bracket 28 is in contact with the conveyor belt and is higher than the conveyor belt. A third cylinder 29 is installed at the rear end of the first bracket 28. The piston rod of the third cylinder 29 passes through the first bracket 28 and is fixed with a conveying block 30 corresponding to the gap. The bottom end of the conveying block 30 is provided with a placement groove 31 located above the conveyor belt.

[0039] Working principle: Before using this embodiment, first screw out the fastening bolts to make different parts of the strip-shaped through groove 18 correspond to the threaded countersunk holes 19, so as to adjust the position of the inverted L-shaped adjustment plate 17, thereby adjusting the distance between the L-shaped adjustment plate and the first bracket 28 according to the width of the bubble tube, so as to ensure that the bubble tubes move one by one in a horizontally extending state.

[0040] When the feeding part 2 conveys the bubble tube to the conveyor belt, the second motor 15 is started, and the output shaft of the second motor 15 rotates to drive one of the transmission wheels to rotate, and the transmission wheel drives the other transmission wheel to rotate through the conveyor belt, and the conveyor belt starts to run. The bubble tube moves to the placement groove 31 as the conveyor belt runs. During the movement of the bubble tube, the limit plate 16 and the first bracket 28 jointly play a role in limiting the bubble tube to prevent the bubble tube from falling from the conveyor belt when it moves with the conveyor belt.

[0041] Then the third cylinder 29 is started, and the piston rod of the third cylinder 29 extends to drive the conveying block 30 to move forward, and the conveying block 30 drives the bubble tube forward. When the placement groove 31 is located directly above the transfer groove 23, the bubble tube falls out of the placement groove 31 and falls into the transfer groove 23 under the action of its own gravity.

[0042] Then the second cylinder 24 is started, and the piston rod of the second cylinder 24 extends to drive the push rod 25 to move leftward, and the push rod 25 pushes the bubble tube out of the transfer groove 23 and pushes it into the receiving hole 7. When the bubble tube is pushed into the receiving hole 7, it is pressed on the arc surface of the spherical pressing block 9, and the spherical pressing block 9 is pressed into the groove 8, and the spring 10 is compressed to form a rebound force. Under the action of the rebound force of the spring 10, the spherical pressing block 9 presses the bubble tube into the receiving hole 7.

[0043] When the push rod 25 pushes the bubble tube, the first optical fiber sensor 27 determines the opening direction of the bubble tube. If the opening of the bubble tube faces the first optical fiber sensor 27, the first optical fiber sensor 27 transmits a signal to the PLC controller, and the PLC controller controls the output shaft of the first motor 5 to rotate 90 degrees counterclockwise, driving the rotating block to rotate, so that the opening of the bubble tube faces upward. If the opening of the bubble tube faces away from the first optical fiber sensor 27, the first optical fiber sensor 27 transmits a signal to the PLC controller, and the controller controls the output shaft of the first motor 5 to rotate 90 degrees clockwise, driving the rotating block to rotate, so that the opening of the bubble tube faces upward. No matter how the rotating block 6 rotates, the receiving hole 7 is in a vertically extending state after rotation, and can be passed through by the ejection rod 13.

[0044] Then start the first cylinder 12, the piston rod of the first cylinder 12 drives the ejector rod 13 to move downward. The ejector block is inserted into the receiving hole 7 to push the bubble tube out and into the bubble tube fixing hole.

[0045] When the bubble tubes on the conveyor belt are continuously pushed out, the second optical fiber sensor 20 is used to detect whether there are sufficient bubble tubes on the conveyor belt. If the second optical fiber sensor 20 does not detect the bubble tubes, it means that there are insufficient bubble tubes on the conveyor belt, and the feeding part 2 starts to transport the bubble tubes in the frame to the conveyor belt. If the second optical fiber sensor 20 detects the bubble tubes, it means that there are sufficient bubble tubes on the conveyor belt, and the feeding part 2 is closed to avoid excessive accumulation of bubble tubes on the conveyor belt.

[0046] The utility model can complete the automatic feeding of the bubble tube and automatically place the bubble tube in the bubble tube fixing hole, which saves time and labor, has high work efficiency, and simplifies the overall structure of the feeding structure body, so that the feeding structure body is easier to assemble and has lower cost.

[0047] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0049] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0050] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A feeding structure for automatically conveying bubble tubes, comprising a feeding structure body, wherein the feeding structure body comprises an outer frame (1) and a feeding part (2), characterized in that: A fixing plate (3) extending horizontally to the left and right is installed at the front end of the outer frame (1), the left end of the fixing plate (3) extends beyond the outer frame (1) and is fixed with a mounting frame (4), a first motor (5) is installed at the rear end of the mounting frame (4), an output shaft of the first motor (5) passes horizontally forward through the mounting frame (4) and is fixed with a rotating block (6), the rotating block (6) is located directly above the bubble tube fixing hole of the external filling device, the rotating block (6) is provided with a receiving hole (7) extending horizontally to the left and right and penetrating the rotating block (6), the receiving hole (7) A groove (8) is provided on the hole wall, a spherical pressing block (9) is arranged in the groove (8), a spring (10) is fixedly connected between one end of the spherical pressing block (9) and the bottom of the groove (8), the other end of the spherical pressing block (9) passes through the groove (8), an extension frame (11) extending forward is fixed at the top of the mounting frame (4), a first cylinder (12) is installed at the top of the extension frame (11), a piston rod of the first cylinder (12) passes vertically downward through the extension frame (11) and is fixed with an ejector rod (13) corresponding to the receiving hole (7); A gap is reserved between the fixed plate (3) and the outer frame (1), and two transmission wheels are rotatably connected in the gap via a rotating shaft, and a conveyor belt (14) is connected between the two transmission wheels, and the top of the conveyor belt (14) is flush with the top of the feeding part (2) and the top of the fixed plate (3). A second motor (15) for driving one of the transmission wheels to rotate is installed on the right side of the front end of the fixed plate (3), and a transfer table (22) is installed on the left side of the front end of the fixed plate (3). The top of the transfer table (22) is provided with a corresponding receiving hole (7) and located A transfer trough (23) is provided in front of the conveyor belt, the left end of the transfer trough (23) passes through the transfer platform (22), a second cylinder (24) is installed on the right side outer wall of the transfer platform (22), the piston rod of the second cylinder (24) penetrates into the transfer trough (23) and is fixed with a push rod (25), a mounting groove (26) is provided at the center position of the left end of the push rod (25), a first optical fiber sensor (27) is installed in the mounting groove (26), and the first optical fiber sensor (27) is electrically connected to the first motor (5) through a PLC controller; A first bracket (28) is installed at the left end of the outer frame (1), a third cylinder (29) is installed at the rear end of the first bracket (28), a piston rod of the third cylinder (29) passes through the first bracket (28) and is fixed with a conveying block (30), and a placement groove (31) located above the conveyor belt is opened at the bottom end of the conveying block (30).

2. The feeding structure for automatically conveying bubble tubes according to claim 1 is characterized in that: A limiting plate (16) is fixed to the top of the fixed plate (3), a gap is reserved between the limiting plate (16) and the mounting frame (4) for a conveying block (30) to pass through, and a front end of the first bracket (28) is in contact with the conveyor belt and is higher than the conveyor belt.

3. The feeding structure for automatically conveying bubble tubes according to claim 2 is characterized in that: An inverted L-shaped adjustment plate (17) is installed at the top of the limiting plate (16), a plurality of strip-shaped through grooves (18) are provided at the top of the limiting plate (16), a plurality of threaded countersunk holes (19) corresponding to the strip-shaped through grooves (18) are provided at the top of the limiting plate (16), fastening bolts are passed between the strip-shaped through grooves (18) and the threaded countersunk holes (19), and the bottom end of the inverted L-shaped adjustment plate (17) is in contact with the top end of the conveyor belt.

4. The feeding structure for automatically conveying bubble tubes according to claim 3 is characterized in that: A second optical fiber sensor (20) is mounted on the limiting plate (16), and a through hole (21) corresponding to the second optical fiber sensor (20) is provided on the inverted L-shaped adjustment plate (17).

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