Delivery mechanism and bottle cap detection apparatus

Abstract

The application discloses a conveying mechanism and a bottle cap detection device. The conveying mechanism comprises a rack, a material receiving part arranged on the rack, the material receiving part being used for being connected with a discharging end of an external feeding mechanism to receive bottle caps fed by the discharging end of the external feeding mechanism, the material receiving part being provided with a blowing port used for blowing air to the bottom of the bottle caps received by the material receiving part, an upper negative pressure conveying belt assembly arranged on the rack and extending along a feeding direction, the upper negative pressure conveying belt assembly being arranged in a staggered mode with the material receiving part, one end of the upper negative pressure conveying belt assembly close to the material receiving part being located directly above the material receiving part, and the upper negative pressure conveying belt assembly being used for adsorbing the bottle caps received by the material receiving part and conveying the adsorbed bottle caps along the feeding direction. The material receiving part has a part extending along the feeding direction from the blowing port, the part being provided with a plurality of blowing holes distributed along the feeding direction, and the blowing holes being used for blowing air upward. The above structure is beneficial to reducing the situation that the bottle caps conveyed by the upper negative pressure conveying belt assembly fall off.

Description

Technical Field

[0001] This application relates to the field of bottle cap inspection technology, and in particular to a conveying mechanism and bottle cap inspection equipment. Background Technology

[0002] Bottle caps are a common filling accessory used to seal the filling opening of filling containers (glass bottles, plastic bottles, etc. for filling liquids). Before assembling the bottle caps onto the filling opening of the filling container, the bottle caps need to be inspected to ensure that the bottle caps entering the assembly process meet the requirements in terms of appearance, size, printing, labeling, etc.

[0003] In existing technologies, to detect the bottom area of ​​bottle caps during conveying, a partially overlapping and staggered upper and lower negative pressure conveyor belt assembly is required for feeding. The upper negative pressure conveyor belt assembly uses vacuum adsorption to pick up the bottle caps conveyed by the lower negative pressure conveyor belt assembly and continues conveying the adsorbed bottle caps, thus exposing the bottom area of ​​the bottle caps for visual inspection. However, in the above feeding process, the upper negative pressure conveyor belt assembly relies solely on its own vacuum adsorption force to pick up the bottle caps conveyed by the lower negative pressure conveyor belt assembly. This results in a slow response speed for the bottle caps to be transferred from the lower negative pressure conveyor belt assembly to the upper negative pressure conveyor belt assembly, and the upper negative pressure conveyor belt assembly struggles to reliably pick up the bottle caps conveyed by the lower negative pressure conveyor belt assembly.

[0004] To address this, related technologies have proposed blowing air into the bottom of the bottle cap to assist in its transfer to the upper negative pressure conveyor belt assembly. This improves the response speed of the transfer and facilitates more stable suction of the cap by the upper negative pressure conveyor belt assembly. However, when blowing air into the bottom of the bottle cap, the airflow is dispersed upon encountering the bottom and impacts the surrounding area. The conveying area where the upper negative pressure conveyor belt assembly has already suctioned the cap and is close to the transfer position (i.e., the point where the cap is suctioned) is impacted by this dispersed airflow, potentially causing the cap to fall off. Summary of the Invention

[0005] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a conveying mechanism that helps reduce the occurrence of bottle caps falling off the upper negative pressure conveyor belt assembly.

[0006] This application also proposes a bottle cap testing device having the above-mentioned conveying mechanism.

[0007] A conveying mechanism according to a first aspect of this application includes: a frame; a receiving section disposed on the frame, the receiving section being used to dock with the discharge end of an external feeding mechanism to receive bottle caps fed by the discharge end of the external feeding mechanism, the receiving section being provided with an air blowing port for blowing air onto the bottom of the bottle caps received by the receiving section; an upper negative pressure conveyor belt assembly disposed on the frame and extending along the feeding direction, the upper negative pressure conveyor belt assembly being vertically offset from the receiving section, one end of the upper negative pressure conveyor belt assembly near the receiving section being located directly above the receiving section, the upper negative pressure conveyor belt assembly being used to adsorb the bottle caps received by the receiving section and convey the adsorbed bottle caps along the feeding direction; wherein, the receiving section has a portion extending from the air blowing port along the feeding direction, the portion being provided with a plurality of air blowing holes distributed along the feeding direction, the air blowing holes being used to blow air upwards.

[0008] The conveying mechanism according to the embodiments of this application has at least the following beneficial effects: In use, the receiving part receives bottle caps fed from the discharge end of the external feeding mechanism. Since the end of the upper negative pressure conveyor belt assembly near the receiving part is located directly above the receiving part, the upper negative pressure conveyor belt assembly can adsorb the bottle caps received by the receiving part and convey the adsorbed bottle caps along the feeding direction, so that the bottom area of ​​the bottle caps is exposed, thereby enabling the detection of the bottom area of ​​the bottle caps in conjunction with visual inspection technology. The receiving part is provided with an air blowing port for blowing air onto the bottom of the bottle caps received by the receiving part. While the upper negative pressure conveyor belt assembly adsorbs the bottle caps received by the receiving part, it blows air onto the bottom of the bottle caps received by the receiving part through the air blowing port to assist the bottle caps in detaching from the support of the receiving part and being adsorbed onto the upper negative pressure conveyor belt assembly. Furthermore, the receiving section has a portion extending from the air inlet along the feeding direction. This portion is provided with multiple air inlets distributed along the feeding direction. The air inlets are used to blow air upwards. The upward airflow from the air inlets can reduce the impact formed after the airflow from the air inlet is dispersed. At the same time, it can provide a certain supporting force for the bottle caps that have been adsorbed by the upper negative pressure conveyor belt assembly and are being conveyed near the transfer position. The above structure helps to reduce the occurrence of bottle caps falling off the upper negative pressure conveyor belt assembly.

[0009] According to some embodiments of this application, the receiving part is provided with a positive pressure chamber, and a constant pressure valve is provided in the positive pressure chamber to divide the positive pressure chamber into a first chamber and a second chamber that are interconnected. The first chamber is used to be connected to a positive pressure air source, the constant pressure valve is used to maintain the pressure in the second chamber, the air blowing port is connected to the first chamber, and the air blowing hole is connected to the second chamber.

[0010] According to some embodiments of this application, the constant pressure valve has a rotatable operating part exposed outside the receiving part, the operating part being used to adjust the preset pressure required to be maintained by the constant pressure valve.

[0011] According to some embodiments of this application, the receiving part is provided with a limiting groove extending along the feeding direction and used to accommodate the bottle cap, the end of the limiting groove is an open structure, and the air blowing port is located at the bottom of the limiting groove.

[0012] According to some embodiments of this application, the conveying mechanism further includes a cap-splitting device, which includes two rotating wheels for clamping bottle caps and driving the clamped bottle caps to feed. The two rotating wheels are respectively disposed on both sides of the receiving part, and a first drive motor for driving the rotating wheels to rotate is disposed on the frame.

[0013] According to some embodiments of this application, the conveying mechanism further includes an upward-opening collection hopper, which is disposed directly below the upper negative pressure conveyor belt assembly, and is used to collect fallen bottle caps.

[0014] According to some embodiments of this application, the upper negative pressure conveyor belt assembly includes a first support, a second drive motor, rollers, and an annular conveyor belt. The first support is disposed on the frame and extends along the feeding direction. Rollers are disposed at both ends of the first support. The annular conveyor belt is wrapped around the first support. The second drive motor is disposed on the first support and is used to drive the annular conveyor belt to move. A negative pressure chamber for connecting to a negative pressure air source is disposed inside the first support. An adsorption hole for adsorbing bottle caps is disposed on the annular conveyor belt, which can communicate with the negative pressure chamber.

[0015] According to some embodiments of this application, a height adjustment structure is provided on the frame corresponding to the upper negative pressure conveyor belt assembly, and the height adjustment structure is used to adjust the height of the upper negative pressure conveyor belt assembly.

[0016] According to some embodiments of this application, the height adjustment structure includes a second bracket, a movable connector, a lead screw assembly, and a drive member. The second bracket is disposed on the frame. The movable connector is movably connected to the second bracket and connected to the first bracket. The lead screw assembly is disposed between the second bracket and the movable connector. The drive member is connected to the lead screw assembly and is used to drive the movable connector to move up and down relative to the second bracket.

[0017] The bottle cap detection device according to a second aspect of this application includes a conveying mechanism according to the first aspect of this application described above.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0020] Figure 1 This is a schematic diagram of the structure of a bottle cap detection device according to an embodiment of this application;

[0021] Figure 2 This is a partial structural diagram of the receiving part in a bottle cap testing device according to an embodiment of this application;

[0022] Figure 3 yes Figure 2 Enlarged view of a portion of point A in the middle;

[0023] Figure 4 yes Figure 2 A cross-sectional view of the structure shown;

[0024] Figure 5 yes Figure 4 Enlarged view of a portion of point B in the middle;

[0025] Figure 6 This is a schematic diagram of the state of the bottle cap inspection device according to an embodiment of the present application when the bottle caps are transferred between the receiving part and the upper negative pressure conveyor belt assembly;

[0026] Figure 7 This is a partial structural diagram of the conveying mechanism in a bottle cap testing device according to an embodiment of this application;

[0027] Figure 8 This is a schematic diagram of the upper negative pressure conveyor belt assembly according to an embodiment of this application;

[0028] Figure 9 yes Figure 8 A cross-sectional view of the structure shown;

[0029] Figure 10 yes Figure 9 A magnified view of a portion of point C in the middle.

[0030] Figure label:

[0031] Bottle cap a, frame 100, receiving part 200, air blowing port 210, air blowing hole 220, constant pressure valve 230, operating part 231, first chamber 240, second chamber 250, limiting groove 260, upper negative pressure conveyor belt assembly 300, first support 310, negative pressure chamber 311, second drive motor 320, roller 330, ring conveyor belt 340, adsorption hole 341, rotating wheel 410, first drive motor 420, hopper 500, second support 610, guide column 611, movable connecting part 620, guide sleeve 621, screw assembly 630, drive part 640. Detailed Implementation

[0032] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0033] In the description of this application, it should be understood that if directional descriptions are involved, such as up, down, front, back, left, right, etc., indicating the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings, it is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0034] In the description of this application, if words such as several, greater than, less than, exceeding, above, below, or within appear, "several" means one or more, "more than" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the number itself, and "above," "below," "within," etc. are understood to include the number itself.

[0035] In the description of this application, the use of terms such as "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0036] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0037] Reference Figures 1 to 10 The conveying mechanism according to an embodiment of this application includes a frame 100, a receiving part 200, and an upper negative pressure conveyor belt assembly 300.

[0038] Specifically, the receiving section 200 is mounted on the frame 100. The receiving section 200 connects to the discharge end of the external feeding mechanism to receive bottle caps a fed from the discharge end of the external feeding mechanism. The receiving section 200 is equipped with an air inlet 210 for connecting to a positive pressure air source and blowing air onto the bottom of the bottle caps a received by the receiving section 200. The upper negative pressure conveyor belt assembly 300 is mounted on the frame 100 and extends along the feeding direction. The upper negative pressure conveyor belt assembly 300 is vertically offset from the receiving section 200. The upper negative pressure conveyor belt assembly 300 is positioned with one end near the receiving part 200 directly above the receiving part 200. The upper negative pressure conveyor belt assembly 300 is used to adsorb the bottle caps a received by the receiving part 200 and transport the adsorbed bottle caps a along the feeding direction. The receiving part 200 has a portion extending along the feeding direction from the air blowing port 210. This portion is provided with a plurality of air blowing holes 220 for connecting to a positive pressure air source and distributed at intervals along the feeding direction. The air blowing holes 220 are used to blow air upward.

[0039] It should be noted that the feeding direction mentioned above is the X direction in the attached diagram.

[0040] In use, the receiving section 200 receives bottle caps a fed from the discharge end of the external feeding mechanism. Since the end of the upper negative pressure conveyor belt assembly 300 near the receiving section 200 is located directly above the receiving section 200, the upper negative pressure conveyor belt assembly 300 can adsorb the bottle caps a received by the receiving section 200 and transport the adsorbed bottle caps a along the feeding direction, so that the bottom area of ​​the bottle caps a is exposed, thereby enabling visual inspection technology to detect the bottom area of ​​the bottle caps a. The receiving section 200 is provided with an air blowing port 210 for connecting to a positive pressure air source and blowing air onto the bottom of the bottle caps a received by the receiving section 200. While the upper negative pressure conveyor belt assembly 300 adsorbs the bottle caps a received by the receiving section 200, the positive pressure air source blows air onto the bottom of the bottle caps a received by the receiving section 200 through the air blowing port 210 to help the bottle caps a detach from the support of the receiving section 200 and be adsorbed onto the upper negative pressure conveyor belt assembly 300. Furthermore, the receiving section 200 has a portion extending along the feeding direction from the air blowing port 210. This portion is provided with multiple air blowing holes 220 for connecting to a positive pressure air source and spaced apart along the feeding direction. The air blowing holes 220 are used to blow air upwards. The upward airflow from the air blowing holes 220 can reduce the impact formed after the airflow from the air blowing port 210 is dispersed. At the same time, it can provide a certain supporting force for the bottle caps a conveyed by the upper negative pressure conveyor belt assembly 300, which has already attracted the bottle caps a and is close to the transfer position (i.e., the position where the bottle cap a is picked up). The above structure helps to reduce the occurrence of bottle caps a being transported by the upper negative pressure conveyor belt assembly 300 falling off.

[0041] Specifically, the diameter of the air inlet 220 is smaller than the diameter of the air outlet 210.

[0042] Reference Figures 4 to 6 In some embodiments, the receiving section 200 has a positive pressure chamber inside, and a constant pressure valve 230 is installed in the positive pressure chamber to divide the positive pressure chamber into a first chamber 240 and a second chamber 250 that are interconnected. The first chamber 240 is connected to a positive pressure air source, and the constant pressure valve 230 is used to maintain the pressure in the second chamber 250. The air outlet 210 is connected to the first chamber 240, and the air hole 220 is connected to the second chamber 250. In use, the same positive pressure air source can supply air to both the air outlet 210 and the air hole 220 simultaneously. The constant pressure valve 230 is used to maintain the pressure in the second chamber 250 so that the air hole 220 can stably provide a suitable airflow to assist in supporting the bottle caps a conveyed by the upper negative pressure conveyor belt assembly 300.

[0043] Reference Figure 2 and Figure 3 In some embodiments, the constant pressure valve 230 has a rotatable operating part 231 exposed outside the receiving part 200. The operating part 231 is used to adjust the preset pressure that the constant pressure valve 230 needs to maintain. Since the operating part 231 is exposed outside the receiving part 200, when it is necessary to adjust the preset pressure that the constant pressure valve 230 needs to maintain, it is not necessary to remove the constant pressure valve 230 from the inside of the positive pressure chamber to perform the adjustment operation, which helps to reduce the difficulty of adjustment.

[0044] Specifically, the constant pressure valve 230 automatically regulates the pressure in the second chamber 250 using a diaphragm and a compression spring to stabilize the pressure in the second chamber 250 at a preset pressure value. Rotating the operating part 231 adjusts the initial compression of the compression spring of the constant pressure valve 230 to adjust the preset pressure that the constant pressure valve 230 needs to maintain. The constant pressure valve is a known technology, and its specific structure and working principle will not be described in detail here.

[0045] Reference Figures 2 to 5 In some embodiments, the receiving part 200 is provided with a limiting groove 260 extending along the feeding direction for accommodating the bottle cap a, which helps to prevent the bottle cap a received by the receiving part 200 from falling off. The end of the limiting groove 260 is an open structure to receive the bottle cap a fed by the discharge end of the external feeding mechanism. The air blowing port 210 is located at the bottom of the limiting groove 260 to blow air onto the bottom of the bottle cap a received by the receiving part 200.

[0046] Reference Figure 2 , Figure 4 and Figure 7In some embodiments, the conveying mechanism further includes a cap-separating device, which includes two rollers 410 for clamping and feeding bottle caps a. The two rollers 410 are respectively disposed on both sides of the receiving section 200. A first drive motor 420 for driving the rollers 410 to rotate is disposed on the frame 100. In use, the rotational speed of the first drive motor 420 is set so that the feeding speed of the bottle caps a clamped by the two rollers 410 is less than the conveying speed of the upper negative pressure conveyor belt assembly 300. This allows the bottle caps a that have been released from the clamping of the rollers 410 and are being conveyed by the upper negative pressure conveyor belt assembly 300 to be separated from the bottle caps a clamped by the two rollers 410, thereby achieving the cap-separating function.

[0047] By adjusting the speed of the first drive motor 420, the distance between two adjacent bottle caps a can be changed to adapt to different feeding requirements.

[0048] Reference Figure 1 and Figure 7 In some embodiments, the conveying mechanism further includes an upward-opening collection hopper 500, which is located directly below the upper negative pressure conveyor belt assembly 300. The collection hopper 500 is used to collect fallen bottle caps a. When bottle caps a conveyed by the upper negative pressure conveyor belt assembly 300 accidentally fall, they can be collected through the collection hopper 500.

[0049] Reference Figures 8 to 10 In some embodiments, the upper negative pressure conveyor belt assembly 300 includes a first support 310, a second drive motor 320, a roller 330, and an annular conveyor belt 340. The first support 310 is disposed on the frame 100 and extends along the feeding direction. Rollers 330 are provided at both ends of the first support 310. The annular conveyor belt 340 is wound around the first support 310. The second drive motor 320 is disposed on the first support 310 and is used to drive the annular conveyor belt 340 to move. The interior of the first support 310 is provided with a negative pressure chamber 311 for connecting to a negative pressure air source. The annular conveyor belt 340 is provided with an adsorption hole 341 that can communicate with the negative pressure chamber 311 and is used to adsorb bottle caps a. Its structure is simple and easy to implement.

[0050] It should be noted that in some embodiments, the output shaft of the second drive motor 320 is connected to one of the rollers 330 to drive the roller 330 to rotate, thereby driving the annular conveyor belt 340 to move.

[0051] It should be noted that in some other embodiments, a tensioning assembly is provided on the first support 310. The tensioning assembly includes multiple tensioning rollers. The output shaft of the second drive motor 320 is connected to one of the tensioning rollers to drive the tensioning roller to rotate. The annular conveyor belt 340 is wound around the tensioning roller so that the rotation of the tensioning roller can drive the annular conveyor belt 340 to move.

[0052] It should be noted that in some embodiments, the frame 100 is provided with a height adjustment structure corresponding to the upper negative pressure conveyor belt assembly 300. The height adjustment structure is used to adjust the height of the upper negative pressure conveyor belt assembly 300, so as to accommodate bottle caps a of different heights.

[0053] Reference Figure 1 and Figure 7 In some embodiments, the height adjustment structure includes a second support 610, a movable connector 620, a lead screw assembly 630, and a drive member 640. The second support 610 is disposed on the frame 100. The movable connector 620 is movably connected to the second support 610 and connected to the first support 310. The lead screw assembly 630 is disposed between the second support 610 and the movable connector 620. The drive member 640 is connected to the lead screw assembly 630 and is used to drive the movable connector 620 to move up and down relative to the second support 610. Its structure is simple and easy to implement.

[0054] It should be noted that in some embodiments, at least two guide posts 611 are spaced apart on the second bracket 610, and a guide sleeve 621 is provided on the movable connector 620 through which the guide posts 611 pass, so that the movable connector 620 can move up and down relative to the second bracket 610.

[0055] It should be noted that in some other embodiments, the second bracket 610 is provided with guide grooves at intervals, and the movable connector 620 is provided with a slider that is slidably connected to the guide groove, so that the movable connector 620 can move up and down relative to the second bracket 610.

[0056] It should be noted that in some embodiments, the nut of the lead screw assembly 630 is fixedly mounted on the second bracket 610, and the screw of the lead screw assembly 630 is connected to the movable connector 620. In this case, when the drive member 640 drives the screw of the lead screw assembly 630 to rotate, the nut of the lead screw assembly 630 remains stationary, thereby driving the screw of the lead screw assembly 630 to move up and down, thereby driving the movable connector 620 to move up and down relative to the second bracket 610, and further driving the first bracket 310 to move up and down relative to the second bracket 610, so as to adjust the height of the upper negative pressure conveyor belt assembly 300.

[0057] It should be noted that in some other embodiments, the nut of the lead screw assembly 630 is fixedly mounted on the movable connector 620, and the screw of the lead screw assembly 630 is rotatably mounted between the second bracket 610 and the frame 100. In this case, when the drive member 640 drives the screw of the lead screw assembly 630 to rotate, the screw of the lead screw assembly 630 can only rotate to drive the nut of the lead screw assembly 630 to move up and down, thereby driving the movable connector 620 to move up and down relative to the second bracket 610, and further driving the first bracket 310 to move up and down relative to the second bracket 610, so as to adjust the height of the upper negative pressure conveyor belt assembly 300.

[0058] Specifically, the drive component 640 is a handwheel. Of course, the drive component 640 can also be a motor, which is not limited here.

[0059] It should be noted that in some other embodiments, the height of the upper negative pressure conveyor belt assembly 300 can also be adjusted by linear drive structures such as electric push rods, cylinders, and hydraulic cylinders, which is not limited here.

[0060] The bottle cap inspection device according to an embodiment of this application includes the conveying mechanism described above.

[0061] It is understood that since the bottle cap detection device of the embodiments of this application includes the above-mentioned conveying mechanism, the bottle cap detection device of the embodiments of this application has all the technical effects of the above-mentioned conveying mechanism.

[0062] In the description of this specification, the use of terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples" indicates that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A delivery mechanism characterized by, The application relates to a bottle cap conveying mechanism. The conveying mechanism comprises a rack, a receiving part arranged on the rack and used for being connected with a discharging end of an external feeding mechanism to receive bottle caps fed by the discharging end of the external feeding mechanism, and a blow port arranged on the receiving part and used for blowing air to the bottom of the bottle caps received by the receiving part. The conveying mechanism further comprises an upper negative pressure conveying belt assembly arranged on the rack and extending along a feeding direction, the upper negative pressure conveying belt assembly is arranged in a staggered mode with the receiving part, one end of the upper negative pressure conveying belt assembly close to the receiving part is located directly above the receiving part, and the upper negative pressure conveying belt assembly is used for adsorbing the bottle caps received by the receiving part and conveying the adsorbed bottle caps along the feeding direction. The receiving part has a part extending along the feeding direction from the blow port, the part is provided with a plurality of blow holes distributed along the feeding direction, and the blow holes are used for upward blowing. The conveying mechanism further comprises a cap separating device, the cap separating device comprises two rotating wheels used for clamping the bottle caps and driving the clamped bottle caps to be fed, the two rotating wheels are arranged on the two sides of the receiving part respectively, and the rack is provided with a first driving motor used for driving the rotating wheels to rotate. The upper negative pressure conveying belt assembly comprises a first support, a second driving motor, a roller and an annular conveying belt, the first support is arranged on the rack and extends along the feeding direction, both ends of the first support are provided with the rollers, the annular conveying belt is arranged outside the first support, the second driving motor is arranged on the first support and used for driving the annular conveying belt to act, the inside of the first support is provided with a negative pressure cavity used for being connected with a negative pressure source, and the annular conveying belt is provided with adsorption holes capable of being connected with the negative pressure cavity and used for adsorbing the bottle caps. The rack is provided with a height adjusting structure corresponding to the upper negative pressure conveying belt assembly, and the height adjusting structure is used for adjusting the height of the upper negative pressure conveying belt assembly. The inside of the receiving part is provided with a positive pressure cavity, the positive pressure cavity is provided with a constant pressure valve to divide the positive pressure cavity into a first chamber and a second chamber which are connected with each other, the first chamber is used for being connected with a positive pressure source, the constant pressure valve is used for maintaining the pressure in the second chamber, the blow port is connected with the first chamber, and the blow holes are connected with the second chamber.

2. The delivery mechanism of claim 1, wherein, The constant pressure valve is provided with a rotatable operation part exposed to the outside of the receiving part, and the operation part is used for adjusting a preset pressure required to be maintained by the constant pressure valve.

3. The delivery mechanism of claim 2, wherein, The receiving part is provided with a limiting groove extending along the feeding direction and used for accommodating the bottle caps, the end of the limiting groove is of an open structure, and the blow port is located at the bottom of the limiting groove.

4. The delivery mechanism of claim 1, wherein, The conveying mechanism further comprises an open-topped material collecting hopper, the material collecting hopper is arranged directly below the upper negative pressure conveying belt assembly, and the material collecting hopper is used for recycling the dropped bottle caps.

5. The delivery mechanism of claim 1, wherein, ​ 6. The delivery mechanism of claim 1, wherein, The height adjusting structure comprises a second support, a movable connecting member, a screw rod assembly and a driving member, the second support is arranged on the frame, the movable connecting member is movably connected to the second support and connected with the first support, the screw rod assembly is arranged between the second support and the movable connecting member, and the driving member is connected to the screw rod assembly and used to drive the movable connecting member to move up and down relative to the second support.

7. A bottle cap inspection apparatus characterized by comprising: A conveyor comprising a conveyor according to any one of claims 1 to 6.

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