A nut feeding system

Abstract

The utility model relates to the technical field of fastener conveying equipment, and more specifically, to a nut feeding system, which includes a frame, a vibrating device, and a vibrating plate. A material trough is provided in the vibrating plate, and a spiral track is provided on the circumferential inner wall of the material trough. A first limiting structure extending along the extension direction of the spiral track is also provided on the circumferential inner wall of the material trough, and a first limiting groove is formed between the first limiting structure and the spiral track; the first limiting structure is provided with an inclined portion for contacting the outer edge of the gasket of a nut with the gasket facing upward. The utility model overcomes the shortcomings of the prior art that the nut gasket is prone to the wrong orientation, which not only affects the robot's grasping of the nut, but also causes the nut to be incorrectly installed. By setting the first limiting structure on the inner wall of the material trough of the vibrating plate, the nut with the gasket facing upward can be removed from the spiral track, so that the nuts output by the vibrating plate are all in a state where the gasket faces downward, which not only facilitates the robot to grasp the nut, but also avoids the incorrect installation of the nut.

Description

Technical Field

[0001] The utility model relates to the technical field of fastener conveying equipment, and more specifically, to a nut feeding system. Background Art

[0002] The nut vibration plate is a device for automatically arranging, placing and conveying nuts. The nuts are vibrated in the vibration plate and rise along the spiral track. During the rising process, they are neatly arranged and conveyed to the first guide rail at the outlet of the vibration plate. They are conveyed to the designated position through the first guide rail for the robot to grab. As disclosed in the prior art, a nut feeder matched with a welding robot includes a chassis fixed on the ground on one side of a spot welding machine, a feeding device and a feeding device; wherein the chassis includes a feeding cylinder, a mounting and fixing, a vibration screening plate, a nut dispensing device and an electrical control component, and the discharge port of the vibration screening plate is connected to the inlet of the nut dispensing device; the feeding device is used to receive the nuts sent from the nut dispensing device and send the nuts to the feeding device, and the feeding device is used to send the nuts to the welding position of the metal plate between the upper electrode and the lower electrode of the spot welding machine.

[0003] Flange nuts are also called gasket nuts. When installing this type of nut, the side with the gasket needs to be in contact with the connecting part to ensure good sealing performance and connection effect. Therefore, it is very important to distinguish the front and back sides of the flange nut and install the flange nut correctly. In the above technical solution, about half of the nuts output after being arranged by the vibration screening plate have gaskets facing up and half have gaskets facing down. When the gasket of the nut faces up, it is easy for the robot to fail to hold the nut and cause the nut to fall off, or cause the nut to be incorrectly installed on the connecting part and affect the connection firmness of the part. Utility Model Content

[0004] In view of the problem that the nut gasket is easily oriented in the wrong direction in the above-mentioned prior art, which not only affects the robot's grasping of the nut, but also causes the nut to be installed incorrectly, the utility model provides a nut feeding system, which can remove the nuts with gaskets facing upwards from the spiral track, making it easier for the robot to grasp the nuts and avoiding the incorrect installation of the nuts.

[0005] In order to solve the above technical problems, the technical solution provided by the utility model is:

[0006] A nut feeding system comprises a frame, a vibrating device arranged on the frame, and a vibrating plate arranged on the top of the vibrating device, wherein a material trough is arranged in the vibrating plate, a spiral track which rises in a spiral direction is arranged on the circumferential inner wall of the material trough, a first guide rail provided with a first guide cavity is connected to the discharge end of the spiral track, a first limiting structure which extends along the extension direction of the spiral track is also arranged on the circumferential inner wall of the material trough, a first limiting groove is formed between the first limiting structure and the spiral track, the first limiting groove is used for the outer edge of the gasket of the nut with the gasket facing downward to pass through; the first limiting structure is provided with an inclined portion which is used to contact the outer edge of the gasket of the nut with the gasket facing upward, the inclined portion extends from the feeding end of the first limiting structure to the direction where the discharge end of the first limiting structure is located, and the distance between the feeding end of the inclined portion and the circumferential inner wall of the material trough is smaller than the distance between its discharge end and the circumferential inner wall of the material trough.

[0007] In the above technical solution, the vibration device continuously applies vibration force to the vibration disk, and the nuts in the vibration disk are arranged on the spiral track under the action of the vibration force and move forward along the spiral track. When the nut with the gasket facing downward passes through the first limiting structure, the outer edge of its gasket can extend into the first limiting groove and keep moving forward stably, finally entering the first guide cavity and moving to the discharge end of the first guide cavity; and when the nut with the gasket facing upward passes through the first limiting structure, the outer edge of its gasket will keep in contact with the inclined portion, because the distance between the feed end of the inclined portion and the circumferential inner wall of the trough is smaller than the distance between its discharge end and the circumferential inner wall of the trough, as the nut continues to move forward, the distance between the nut and the inner wall of the trough gradually increases and gradually moves out of the spiral track, and finally breaks away from the spiral track and falls into the trough due to instability. The inclined portion will interfere with the movement of the gasket of the nut with the gasket facing upward without affecting the stable movement of the nut with the gasket facing downward, causing the nut with the gasket facing upward to gradually move away from the inner wall of the trough until it falls into the trough, thereby achieving the removal of the nut with the gasket facing upward from the spiral track.

[0008] Preferably, the first limiting structure is further provided with a guide protrusion, the guide protrusion is located at the top edge of the inclined portion and the guide protrusion extends downward from the feed end of the inclined portion to the discharge end of the inclined portion. The guide protrusion can guide the nut with the gasket facing upward to move smoothly from the feed end of the inclined portion to the discharge end of the inclined portion, so that the movement state and route of the nut with the gasket facing upward are more stable and unified, and the nut with the gasket facing upward is prevented from tipping over and affecting the movement of the nut with the gasket facing downward.

[0009] Preferably, a second limiting structure is further provided on the circumferential inner wall of the material trough, and the second limiting structure is located on the feeding side of the first limiting structure, and a second limiting groove for a single nut to pass through is formed between the second limiting structure and the spiral track. It can be understood that the nut first passes through the second limiting groove and then passes through the first limiting groove. When multiple nuts overlap in the vertical direction, the second limiting structure can prevent the nuts on the upper layer from continuing to move forward, so that the nuts on the upper layer fall back into the material trough, while the nuts on the bottom layer are not interfered by the second limiting structure and can smoothly pass through the second limiting groove and then move to pass through the first limiting groove. The second limiting structure can ensure that the nuts are arranged in a single layer, avoid the nuts from being piled up in a disorderly manner and interfering with the movement of other nuts at the first limiting structure, and thus help to improve the rejection efficiency and conveying efficiency of the nuts.

[0010] Preferably, a hopper is provided on the frame, and a downwardly inclined feeding chute is provided at the discharge port of the hopper, and the feeding chute is located above the vibrating plate. The hopper can be used to store nuts, so as to facilitate adding nuts to the trough of the vibrating plate. When the number of nuts in the trough of the vibrating plate is reduced to a certain amount, the nuts on the hopper can be poured into the trough through the feeding chute.

[0011] Preferably, the hopper is provided with a driving assembly, the power output end of the driving assembly is connected with a push plate, the push plate is parallel to the bottom surface of the feed chute and the push plate is slidably connected to the feed chute, and the driving assembly is used to drive the push plate to slide in the direction of the discharge end of the feed chute. When it is necessary to add nuts to the trough of the vibrating plate, the driving assembly is used to drive the push plate to slide in the direction of the discharge end of the feed chute, so as to push at least part of the nuts on the push plate into the trough of the vibrating plate. In this way, there is no need to add nuts manually, which saves more manpower.

[0012] The drive assembly may be a synchronous belt drive structure, a cylinder drive structure, a hydraulic cylinder drive structure, a gear rack drive structure, an electric push rod drive structure, etc. Preferably, the drive assembly includes a first cylinder disposed outside the hopper, and a piston rod of the first cylinder is connected to the push plate. The first cylinder is used to push the push plate to slide, thereby pushing the nut on the push plate into the material groove of the vibrating plate. The structure of the first cylinder is relatively simple, easy to install and maintain, and its reaction speed is relatively fast, which can improve the efficiency of adding nuts.

[0013] Preferably, it also includes a mounting assembly and a force sensor connected to the mounting assembly, the force sensor is connected to the hopper or the frame through the mounting assembly, the probe of the force sensor extends into the material trough for contacting the nut, and the probe of the force sensor is located at the eccentricity of the vibration disk. It can be understood that the nuts in the vibration disk will move outward from the axis of the vibration disk along the radial direction of the vibration disk, or make circular motion around the axis of the vibration disk. These nuts will generate a certain extrusion force on the probe of the force sensor during the movement, and the more nuts there are, the greater the pressure detected by the force sensor. Therefore, the number of nuts in the material trough can be judged according to the pressure measured by the force sensor. When the resistance measured by the force sensor is less than a certain value, the drive assembly drives the push plate to slide, thereby adding nuts to the material trough until the resistance measured by the force sensor reaches a certain value. This can improve the automation and efficiency of nut transportation.

[0014] Preferably, the first guide rail is arranged to be inclined downward, which is helpful to reduce the resistance of the nut moving in the first guide cavity and avoid the nut being stuck in the first guide cavity.

[0015] Preferably, a vibrator is provided on the frame, and the first guide rail is connected to the power output end of the vibrator. The vibrator can apply vibration force to the first guide rail, thereby prompting the nut to move from the feeding end of the first guide rail to the discharging end thereof, so as to improve the discharging efficiency of the nut.

[0016] Preferably, it also includes a second guide rail arranged on the frame, a second cylinder arranged on the second guide rail, a bearing member slidably connected to the second guide rail, and a clamping assembly arranged on the frame, wherein the second guide rail is provided with a second guide cavity, the second guide cavity is interconnected with the first guide cavity and the extension directions of the two are perpendicular to each other; the bearing member is slidably connected with the second guide cavity along the extension direction of the second guide cavity; the bearing member is provided with a receiving groove for receiving a single nut; the second cylinder is used to drive the bearing member to slide; the clamping assembly is located at the discharge end of the second guide cavity and is used to clamp the nut located on the receiving groove. After the nut comes out from the discharge end of the first guide rail, it falls on the receiving groove of the bearing member, and then the second cylinder drives the bearing member to move toward the discharge end of the second guide rail; after the bearing member transports the nut to the discharge end of the second guide rail, the clamping assembly clamps the nut located on the receiving groove so that the robot can grab the nut.

[0017] It should be noted that the first cylinder and the second cylinder are both cylinders in the prior art, and “first” and “second” are only used to distinguish between the two.

[0018] Beneficial effects of the utility model:

[0019] (1) A first limiting structure is provided on the inner wall of the material trough of the vibration plate, and the inclined surface on the first limiting structure is used to keep in contact with the gasket of the nut with the gasket facing upward, so that the nut with the gasket facing upward gradually moves away from the inner wall of the material trough while moving forward, and finally falls into the material trough due to instability, thereby removing the nut with the gasket facing upward from the spiral track, so that the nuts output by the vibration plate are all in the state of gasket facing downward, which not only makes it easier for the robot to grasp the nut firmly, but also avoids the incorrect installation of the nut.

[0020] (2) A hopper, a driving assembly and a push plate are arranged on the frame, and the driving assembly is used to push the push plate to push the nuts into the trough, so that the nuts can be automatically added, which saves more manpower.

[0021] (3) The force sensor is used to detect the pressure exerted by the nut on it, and the remaining number of nuts in the trough is determined according to the measured pressure, so that the number of nuts in the trough can be monitored in real time, so that nuts can be added to the trough in time, which can improve the automation and efficiency of nut conveying. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a nut feeding system from the first perspective;

[0023] Figure 2 yes Figure 1 A magnified schematic diagram of part A in FIG.

[0024] Figure 3 It is a structural schematic diagram of a nut feeding system from a second perspective;

[0025] Figure 4 yes Figure 3 A magnified schematic diagram of part B in FIG.

[0026] Figure 5 It is a structural schematic diagram of a nut feeding system from a third perspective;

[0027] Figure 6 It is a schematic diagram of the structure of the first guide rail and the second guide rail.

[0028] In the accompanying drawings: 1-frame; 2-vibration device; 3-vibration plate; 301-material trough; 302-spiral track; 4-first guide rail; 401-first guide cavity; 5-first limiting structure; 501-first limiting groove; 502-inclined portion; 503-guide protrusion; 6-second limiting structure; 601-second limiting groove; 7-hopper; 8-feeding slide; 9-first cylinder; 10-push plate; 11-mounting assembly; 12-force sensor; 13-vibrator; 14-second guide rail; 1401-second guide cavity; 15-second cylinder; 16-bearing member; 1601-accommodating groove; 17-clamping assembly; 18-nut. DETAILED DESCRIPTION

[0029] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0030] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, they 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 direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0031] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0032] Example 1

[0033] Combination Figures 1 to 4 The nut feeding system shown in the figure comprises a frame 1, a vibrating device 2 arranged on the frame 1, and a vibrating plate 3 arranged on the top of the vibrating device 2. A material trough 301 is arranged in the vibrating plate 3. A spiral track 302 that rises in a spiral is arranged on the circumferential inner wall of the material trough 301. A first guide rail 4 that has a first guide cavity 401 is connected to the discharge end of the spiral track 302. A first limiting structure 5 that extends along the extension direction of the spiral track 302 is also arranged on the circumferential inner wall of the material trough 301. The first limiting structure 5 and the spiral track 302 are connected to the discharge end of the spiral track 302. A first limiting groove 501 is formed between the rails 302, and the first limiting groove 501 is used for the outer edge of the gasket of the nut 18 with the gasket facing downward to pass through; the first limiting structure 5 is provided with an inclined portion 502 for contacting the outer edge of the gasket of the nut 18 with the gasket facing upward, and the inclined portion 502 extends from the feed end of the first limiting structure 5 to the direction of the discharge end of the first limiting structure 5, and the distance between the feed end of the inclined portion 502 and the circumferential inner wall of the trough 301 is smaller than the distance between its discharge end and the circumferential inner wall of the trough 301.

[0034] Furthermore, the system also includes an electronic speed regulator (not shown in the figure) electrically connected to the vibration device 2. The electronic speed regulator can be used to adjust the vibration frequency of the vibration device 2, thereby adjusting the discharge speed of the nut 18.

[0035] Furthermore, the first limiting structure 5 is further provided with a guide protrusion 503, which is located at the top edge of the inclined portion 502 and extends obliquely downward from the feed end of the inclined portion 502 to the discharge end of the inclined portion 502. The guide protrusion 503 can guide the nut 18 with the gasket facing upward to move steadily and smoothly from the feed end of the inclined portion 502 to the discharge end of the inclined portion 502, so that the movement state and route of the nut 18 with the gasket facing upward are more stable and uniform, and the nut 18 with the gasket facing upward is prevented from tipping over and affecting the movement of the nut 18 with the gasket facing downward.

[0036] Furthermore, a second limiting structure 6 is provided on the inner circumferential wall of the trough 301, and the second limiting structure 6 is located on the feeding side of the first limiting structure 5, and a second limiting groove 601 for a single nut 18 to pass through is formed between the second limiting structure 6 and the spiral track 302. It can be understood that the nut 18 first passes through the second limiting groove 601, and then passes through the first limiting groove 501. When multiple nuts 18 overlap in the vertical direction, the second limiting structure 6 can prevent the nuts 18 on the upper layer from continuing to move forward, so that the nuts 18 on the upper layer fall back into the trough 301, while the nuts 18 on the bottom layer are not interfered by the second limiting structure 6 and can smoothly pass through the second limiting groove 601, and then move to pass through the first limiting groove 501. The second limiting structure 6 can ensure that the nuts 18 are arranged in a single layer, and avoid the nuts 18 from being piled up and disordered, which interferes with the movement of other nuts 18 at the first limiting structure 5, so as to improve the rejection efficiency and conveying efficiency of the nuts 18.

[0037] The working principle or workflow of this embodiment is as follows: during implementation, the vibration device 2 continuously applies vibration force to the vibration plate 3, and the nuts 18 in the vibration plate 3 are arranged on the spiral track 302 under the action of the vibration force and move forward along the spiral track 302. The nuts 18 first pass through the second limiting groove 601, are arranged into a single layer under the restriction of the second limiting structure 6, and then move to the first limiting structure 5 through the first limiting groove 501, and finally output through the first guide cavity 401. When the nut 18 passes through the first limiting structure 5, the nut 18 with the gasket facing downward always keeps moving forward smoothly, and the outer edge of the nut 18 with the gasket facing upward keeps in contact with the inclined portion 502. Since the distance between the feed end of the inclined portion 502 and the circumferential inner wall of the trough 301 is smaller than the distance between the discharge end and the circumferential inner wall of the trough 301, as the nut 18 continues to move forward, the distance between the nut 18 and the inner wall of the trough 301 gradually increases and gradually moves out of the spiral track 302, and finally deviates from the spiral track 302 due to instability and falls into the trough 301.

[0038] The beneficial effects of this embodiment are as follows: a first limiting structure is provided on the inner wall of the material trough of the vibration disk, and the inclined portion on the first limiting structure is utilized to maintain contact with the gasket of the nut with the gasket facing upward, so that the nut with the gasket facing upward gradually moves away from the inner wall of the material trough while moving forward, and eventually falls into the material trough due to instability, thereby removing the nut with the gasket facing upward from the spiral track, so that the nuts output by the vibration disk are all in a state of gasket facing downward, which not only makes it convenient for the robot to grasp the nut firmly, but also avoids the incorrect installation of the nut.

[0039] Example 2

[0040] This embodiment is based on the embodiment 1. Figure 1 , Figure 3 and Figure 5 As shown, a hopper 7 is provided on the frame 1, and a downwardly inclined feeding chute 8 is provided at the discharge port of the hopper 7, and the feeding chute 8 is located above the vibration plate 3. The hopper 7 can be used to store nuts, so as to facilitate adding nuts to the trough 301 of the vibration plate 3. When the nuts in the trough 301 of the vibration plate 3 are reduced to a certain number, the nuts on the hopper 7 can be poured into the trough 301 through the feeding chute 8.

[0041] Furthermore, a driving assembly is provided on the hopper 7, and a push plate 10 is connected to the power output end of the driving assembly. The push plate 10 is parallel to the bottom surface of the feeding chute 8 and is slidably connected to the feeding chute 8. The driving assembly is used to drive the push plate 10 to slide in the direction of the discharge end of the feeding chute 8. When it is necessary to add nuts to the material trough 301 of the vibration plate 3, the driving assembly is used to drive the push plate 10 to slide in the direction of the discharge end of the feeding chute 8, so as to push at least part of the nuts on the push plate 10 into the material trough 301 of the vibration plate 3. In this way, there is no need to add nuts manually, which saves more manpower.

[0042] Specifically, the driving assembly includes a first cylinder 9 disposed outside the hopper 7, and a piston rod of the first cylinder 9 is connected to a push plate 10. The first cylinder 9 is used to push the push plate 10 to slide, thereby pushing the nut on the push plate 10 into the material groove 301 of the vibration plate 3. The structure of the first cylinder 9 is relatively simple, easy to install and maintain, and its reaction speed is relatively fast, which can improve the efficiency of adding nuts.

[0043] Furthermore, it also includes a mounting assembly 11 and a force sensor 12 connected to the mounting assembly 11. The force sensor 12 is connected to the hopper 7 through the mounting assembly 11. The probe of the force sensor 12 extends into the trough 301 for contacting the nut. The probe of the force sensor 12 is located at the eccentric position of the vibration disk 3. It can be understood that the nuts in the vibration disk 3 will move outward from the axis of the vibration disk 3 along the radial direction of the vibration disk 3, or make a circular motion around the axis of the vibration disk 3. These nuts will generate a certain extrusion force on the probe of the force sensor 12 during the movement, and the more nuts there are, the greater the pressure detected by the force sensor 12. Therefore, the number of nuts in the trough 301 can be determined according to the pressure measured by the force sensor 12. When the resistance measured by the force sensor 12 is less than a certain value, the driving assembly drives the push plate 10 to slide, thereby adding nuts to the trough 301 until the resistance measured by the force sensor 12 reaches a certain value. This can improve the automation and efficiency of nut transportation.

[0044] The other features, working principles and beneficial effects of this embodiment are consistent with those of Embodiment 1.

[0045] Example 3

[0046] This embodiment is based on the embodiment 3. Figure 1 , Figure 3 , Figure 5 and Figure 6 As shown, the first guide rail 4 is arranged to be tilted downward, which is helpful to reduce the resistance of the nut 18 moving in the first guide cavity 401 and prevent the nut 18 from getting stuck in the first guide cavity 401.

[0047] Furthermore, a vibrator 13 is provided on the frame 1, and the first guide rail 4 is connected to the power output end of the vibrator 13. The vibrator 13 can apply a vibration force to the first guide rail 4, thereby prompting the nut 18 to move from the feeding end of the first guide rail 4 to its discharging end, so as to improve the discharging efficiency of the nut 18.

[0048] Furthermore, the system also includes a second guide rail 14 arranged on the frame 1, a second cylinder 15 arranged on the second guide rail 14, a bearing member 16 slidably connected to the second guide rail 14, and a clamping assembly 17 arranged on the frame 1, the second guide rail 14 is provided with a second guide cavity 1401, the second guide cavity 1401 is communicated with the first guide cavity 401 and the extension directions of the two are perpendicular to each other; the bearing member 16 is slidably connected to the second guide cavity 1401 along the extension direction of the second guide cavity 1401; the bearing member 16 is provided with a receiving groove 1601 for receiving a single nut 18; the second cylinder 15 is used to drive the bearing member 16 to slide; the clamping assembly 17 is located at the discharge end of the second guide cavity 1401 and is used to clamp the nut 18 located on the receiving groove 1601. After the nut 18 comes out of the discharge end of the first guide rail 4, it falls on the receiving groove 1601 of the carrier 16, and then the second cylinder 15 drives the carrier 16 to move toward the discharge end of the second guide rail 14; after the carrier 16 transports the nut 18 to the discharge end of the second guide rail 14, the clamping assembly 17 clamps the nut 18 on the receiving groove 1601 so that the robot can grab the nut 18. It should be noted that the clamping assembly 17 is a prior art, so its structure will not be described in detail.

[0049] In addition, the first cylinder 9 and the second cylinder 15 are both cylinders of the prior art, and “first” and “second” are only used to distinguish between the two.

[0050] The other features, working principles and beneficial effects of this embodiment are consistent with those of Embodiment 2.

[0051] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description, and it is not necessary and impossible to list all the implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A nut feeding system, comprising a frame (1), a vibrating device (2) arranged on the frame (1), and a vibrating plate (3) arranged on the top of the vibrating device (2), wherein a material trough (301) is arranged in the vibrating plate (3), a spiral track (302) which rises in a spiral is arranged on the circumferential inner wall of the material trough (301), and a first guide rail (4) provided with a first guide cavity (401) is connected to the discharge end of the spiral track (302), characterized in that: A first limiting structure (5) extending along the extension direction of the spiral track (302) is also provided on the circumferential inner wall of the material trough (301), and a first limiting groove (501) is formed between the first limiting structure (5) and the spiral track (302), and the first limiting groove (501) is used for allowing the outer edge of the gasket of the nut with the gasket facing downward to pass through; the first limiting structure (5) is provided with an inclined portion (502) for contacting the outer edge of the gasket of the nut with the gasket facing upward, and the inclined portion (502) extends from the feeding end of the first limiting structure (5) to the direction of the discharging end of the first limiting structure (5), and the distance between the feeding end of the inclined portion (502) and the circumferential inner wall of the material trough (301) is smaller than the distance between its discharging end and the circumferential inner wall of the material trough (301).

2. A nut feeding system according to claim 1, characterized in that: The first limiting structure (5) is also provided with a guide protrusion (503), which is located at the top edge of the inclined portion (502) and extends downward from the feeding end of the inclined portion (502) to the discharging end of the inclined portion (502).

3. A nut feeding system according to claim 1, characterized in that: A second limiting structure (6) is also provided on the circumferential inner wall of the material trough (301), and the second limiting structure (6) is located on the feeding side of the first limiting structure (5), and a second limiting groove (601) for a single nut to pass through is formed between the second limiting structure (6) and the spiral track (302).

4. A nut feeding system according to claim 1, characterized in that: A hopper (7) is provided on the frame (1), and a downwardly inclined material conveying chute (8) is provided at the material outlet of the hopper (7), and the material conveying chute (8) is located above the vibration plate (3).

5. A nut feeding system according to claim 4, characterized in that: The hopper (7) is provided with a driving assembly, the power output end of the driving assembly is connected to a push plate (10), the push plate (10) is parallel to the bottom surface of the conveyor chute (8) and the push plate (10) is slidably connected to the conveyor chute (8), and the driving assembly is used to drive the push plate (10) to slide in the direction of the discharge end of the conveyor chute (8).

6. A nut feeding system according to claim 5, characterized in that: The driving assembly comprises a first cylinder (9) arranged outside the hopper (7), and a piston rod of the first cylinder (9) is connected to the push plate (10).

7. A nut feeding system according to claim 4, characterized in that: It also includes a mounting assembly (11) and a force sensor (12) connected to the mounting assembly (11); the force sensor (12) is connected to the hopper (7) or the frame (1) via the mounting assembly (11); a probe of the force sensor (12) extends into the trough (301) to contact the nut; the probe of the force sensor (12) is located at an eccentric position of the vibration plate (3).

8. A nut feeding system according to claim 1, characterized in that: The first guide rail (4) is arranged to be inclined downward.

9. A nut feeding system according to claim 8, characterized in that: A vibrator (13) is provided on the frame (1), and the first guide rail (4) is connected to a power output end of the vibrator (13).

10. A nut feeding system according to any one of claims 1 to 9, characterized in that: The machine also comprises a second guide rail (14) arranged on the frame (1), a second cylinder (15) arranged on the second guide rail (14), a bearing member (16) slidably connected to the second guide rail (14), and a clamping assembly (17) arranged on the frame (1), wherein the second guide rail (14) is provided with a second guide cavity (1401), the second guide cavity (1401) is communicated with the first guide cavity (401) and the extension directions of the two are perpendicular to each other; the bearing member (16) is slidably connected to the second guide cavity (1401) along the extension direction of the second guide cavity (1401); the bearing member (16) is provided with a receiving groove (1601) for receiving a single nut; the second cylinder (15) is used to drive the bearing member (16) to slide; the clamping assembly (17) is located at the discharge end of the second guide cavity (1401) and is used to clamp the nut located in the receiving groove (1601).

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