Cap sorting detection device and cap screwing machine

Abstract

The invention relates to a cap sorting detection device and a cap screwing machine, and relates to the technical field of detection, the cap sorting detection device comprises a cap sorting barrel, a cap sorting disc and a detection structure, the cap sorting barrel is obliquely arranged, and a discharge port is formed in the cap sorting barrel; the cap sorting disc is rotationally connected into the cap sorting barrel, a plurality of limiting grooves are formed in the top surface of the cap sorting disc, and the multiple limiting grooves are arranged around the cap sorting disc by a circle; a detection structure is arranged in each limiting groove, each detection structure comprises a pressure detector and an air injection part, the pressure detectors are located in the centers of the limiting grooves, the pressure detectors are connected with the air injection parts, and when the pressure detectors detect pressure, the air injection parts are controlled to spray air flow to eject the bottle caps out of the limiting grooves. The situation that the bottle cap is still ejected out of the limiting groove when the bottle cap is in the correct direction can be reduced.

Description

Technical Field

[0001] The present application relates to the field of detection technology, and in particular to a cap sorting detection device and a capping machine. Background Art

[0002] The capping machine is a device used to close bottles or containers, and the closing operation is completed by rotating the bottle cap. It is widely used in food, beverage, medicine, cosmetics and other industries to close various types of bottles or containers to ensure the sealing and safety of the products.

[0003] The capping machine mainly includes a cap sorting and detecting device, a conveying device and a capping device. Before the bottle caps are transported by the conveying device, they will be processed by the cap sorting and detecting device so that the bottle caps are in the same direction to ensure that the bottle caps can be smoothly capped on the container bottles after being transported to the capping device by the conveying device.

[0004] Among them, the cap sorting and detection device mainly includes a cap sorting barrel and a cap sorting plate rotatably connected to the cap sorting barrel. A limiting groove is provided on the cap sorting plate. After the bottle caps are poured into the cap sorting barrel, the bottle caps will enter the limiting groove under the rotation of the cap sorting plate, and finally enter the conveying structure from the discharge port of the cap sorting barrel.

[0005] In order to keep the bottle caps in the same direction, a nozzle is provided in the limiting groove. When the opening of the bottle cap faces away from the bottom wall of the limiting groove, the airflow ejected by the nozzle will flow out along the surrounding side walls of the limiting groove. When the opening of the bottle cap faces the bottom wall of the limiting groove, it will be covered on the nozzle. The airflow ejected by the nozzle will push the bottle cap out of the limiting groove, thereby achieving the purpose of screening.

[0006] During the screening process, the nozzle will not only spray airflow to the bottle caps facing the wrong direction, but also to the bottle caps facing the right direction. In this case, the flow rate of the airflow needs to be controlled to ensure that the bottle caps facing upward are not ejected but the bottle caps facing downward are ejected, and the bottle caps facing the right direction (i.e. the bottle caps facing upward) are more likely to be ejected by the nozzle, resulting in screening errors and low screening efficiency.

[0007] At the same time, because the opening of the bottle cap needs to face downward when the bottle cap is capped on the container bottle, and the opening of the bottle cap screened out by the traditional cap sorting and detection device faces upward, the bottle cap needs to be turned over on the conveying device after screening, which further makes the screening operation cumbersome. Summary of the invention

[0008] The purpose of the present application is to provide a cap sorting and detecting device and a capping machine, which are easier to operate and can reduce the situation where the bottle cap is still ejected out of the limiting groove when it is in the correct orientation.

[0009] In the first aspect, the present application provides a cap sorting and detection device adopting the following technical solution:

[0010] A cap sorting and detecting device, comprising:

[0011] A cap sorting barrel, which is tilted and has a discharge port;

[0012] A cap sorting plate is rotatably connected to the cap sorting barrel, and a plurality of limiting grooves are provided on the top surface of the cap sorting plate, and the plurality of limiting grooves are arranged around the cap sorting plate;

[0013] A detection structure, each of the limit grooves is provided with the detection structure, the detection structure comprises a pressure detector and a plurality of jet parts, and the pressure detector is located in the center of the limit groove;

[0014] Wherein, the pressure detector is connected to the jet component, and when the pressure detector detects pressure, the jet component is controlled to spray air to push the bottle cap out of the limiting groove.

[0015] Furthermore, a limiting hole is provided on the bottom wall of the limiting groove, a limiting structure is arranged between the bottom wall of the cap sorting barrel and the cap sorting plate, and the limiting structure is partially inserted into the limiting hole and can slide along the axial direction of the limiting hole.

[0016] Furthermore, the limiting structure includes:

[0017] A ring plate having a ring groove;

[0018] A plurality of limiting members are provided, and the plurality of limiting members are provided in one-to-one correspondence with the plurality of limiting holes, and are slidably connected in the corresponding limiting holes;

[0019] An elastic member has one end connected to the limiting member and the other end extending into the annular groove.

[0020] The limiting member comprises:

[0021] A limit block, one end of which is connected to the elastic member;

[0022] A limiting ring, sleeved on the other end of the limiting block;

[0023] A sliding groove is provided on the side wall of the limiting hole, and a movable part is slidably arranged in the sliding groove, and the movable part includes:

[0024] A movable block, slidably connected in the slide groove;

[0025] Two movable rods are provided, and the two movable rods are arranged oppositely at the upper and lower sides of the movable block, the two ends of the upper movable rod are respectively hinged to the limit ring and the movable block, and the two ends of the lower movable rod are respectively hinged to the limit block and the movable block;

[0026] The pressure detector is arranged on the limiting ring, and sinks into the limiting hole when the limiting block extends forward.

[0027] Furthermore, the ring plate is provided with a first step surface and a second step surface, the first step surface is arranged lower than the second step surface, and the limiting block partially extends out of the limiting hole when it is above the second step surface.

[0028] Furthermore, there is a smooth transition between the first step surface and the second step surface, and both ends of the ring plate are bent in a direction toward the bottom wall of the cap sorting barrel.

[0029] Furthermore, a ball is provided at one end of the elastic member facing the ring plate.

[0030] Furthermore, a plurality of annular clamping grooves are arranged on the inner wall of the cap sorting barrel, and the plurality of clamping grooves are evenly distributed along the axial direction of the cap sorting barrel, and the ring plate is installed in the cap sorting barrel through any of the clamping grooves.

[0031] Furthermore, an annular protective plate is arranged in the cap sorting barrel, and the protective plate is arranged above the cap sorting plate at intervals.

[0032] In the second aspect, the present application provides a capping machine adopting the following technical solution:

[0033] A capping machine comprises a conveying device, a capping device and the above-mentioned cap sorting and detecting device.

[0034] In summary, the present application includes at least one of the following beneficial technical effects:

[0035] 1. The detection mechanism in the present application includes a pressure detector and a jet component. The operating state of the jet component is controlled by setting the pressure detector. When the bottle cap is in the correct orientation, the jet component is in a closed state, which reduces the situation where the bottle cap is still ejected out of the limit groove when it is in the correct orientation. At the same time, the activation frequency of the jet component is reduced, which also plays a better protective role for the jet component.

[0036] 2. A limiting structure is provided in the present application, which enables the bottle caps facing the correct direction to be better limited, thereby reducing the possibility of the bottle caps sliding out of the limiting grooves when moving from the lower position to the upper position. At the same time, the bottle caps facing the wrong direction can be pushed out of the limiting grooves, and the bottle caps slide down after the limiting block is reset. In this way, when individual jet parts fail, the bottle caps facing the wrong direction can still be screened out, thereby improving the reliability of the cap sorting and detection device.

[0037] 3. The limiting member in the present application includes a limiting ring and a limiting block. With the help of the forward movement of the limiting block, the limiting ring can be hidden in the limiting hole in time, so that the limiting member can also play a role in combing the bottle cap and protecting the pressure detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a schematic diagram of the three-dimensional structure of the cap sorting and detection device in this application;

[0039] Figure 2 It is a schematic diagram of the three-dimensional structure of the cap sorting and detection device in the present application after removing the cap sorting barrel and the protective plate;

[0040] Figure 3 It is a cross-sectional structural schematic diagram of the cap sorting and detection device in the present application;

[0041] Figure 4 yes Figure 3 A partial enlarged schematic diagram of part A;

[0042] In the figure, 1, cover sorting barrel; 11, discharge port; 12, clamping groove; 2, cover sorting plate; 21, limiting groove; 22, limiting hole; 23, slide groove; 3, detection structure; 31, pressure detector; 32, jet part; 4, limiting structure; 41, ring plate; 411, ring groove; 412, first step surface; 413, second step surface; 42, limiting part; 421, limiting ring; 422, limiting block; 43, elastic part; 44, ball; 5, movable part; 51, movable block; 52, movable rod; 6, protective plate; 7, cover sorting drive part. DETAILED DESCRIPTION

[0043] The following will be combined with the attached Figure 1-4 The technical solution of the present application is described clearly and completely. The following embodiments are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application. In the following description, the same symbols are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0044] In the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the present application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it 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 an indirect connection 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 this application can be understood according to specific circumstances.

[0046] It should be further understood that the term “and / or” used in the specification and corresponding claims of this application refers to any and all possible combinations of one or more of the listed items.

[0047] A cap sorting and detecting device, referring to Figure 1 and Figure 2 , comprising a cap sorting barrel 1, a cap sorting plate 2 and a cap sorting driving member 7. The cap sorting barrel 1 is tilted and has a discharge port 11. The cap sorting plate 2 is rotatably connected to the cap sorting barrel 1. The cap sorting driving member 7 is connected to the cap sorting plate 2 to drive the cap sorting plate 2 to rotate. A plurality of limiting grooves 21 are provided on the top surface of the cap sorting plate 2, and the plurality of limiting grooves 21 are arranged around the cap sorting plate 2.

[0048] The inclined setting of the cap sorting barrel 1 makes the cap sorting barrel 1 have an upper position and a lower position. During the cap sorting process, the bottle caps are poured into the cap sorting barrel 1, and the bottle caps will accumulate at the lower position under the action of their own gravity. During the rotation of the cap sorting plate 2, some of the bottle caps will enter the limiting groove 21 and finally be discharged from the discharge port 11 (located at the lower position).

[0049] Furthermore, combined with Figure 3 and Figure 4 A detection structure 3 is disposed in each limiting groove 21, and the detection structure 3 can identify the opening direction of the bottle cap, thereby ensuring that the orientation of the bottle cap is accurate.

[0050] Specifically, the detection structure 3 includes a pressure detector 31 and a jet component 32. The pressure detector 31 is located in the center of the limiting groove 21. The pressure detector 31 is connected to the jet component 32. When the pressure detector 31 detects pressure, the jet component 32 is controlled to spray air to push the bottle cap out of the limiting groove 21.

[0051] In the present application, the opening of the bottle cap is directed toward the cap sorting plate 2 as a reference direction. When the opening of the bottle cap is directed toward the cap sorting plate 2, the gap between the bottom surface of the bottle cap and the pressure detector 31 is matched, the pressure detector 31 does not detect pressure, and the jet component 32 does not respond.

[0052] When the opening of the bottle cap faces away from the cap sorting plate 2, the bottom surface of the bottle cap contacts the pressure detector 31, and the pressure detector 31 detects the pressure. The pressure detector 31 sends a control signal to control the jet component 32 to spray air toward the bottle cap in the corresponding limiting groove 21 to push the bottle cap out of the limiting groove 21.

[0053] Compared with the traditional method of using the jet component 32 to directly spray the bottle cap in the limiting groove 21, the present application controls the operating state of the jet component 32 by setting a pressure detector 31. When the bottle cap is in the correct orientation, the jet component 32 is in a closed state, thereby reducing the situation where the bottle cap is still ejected from the limiting groove 21 when it is in the correct orientation.

[0054] At the same time, the activation frequency of the jet component 32 is reduced, which also plays a better protective role on the jet component 32.

[0055] In a specific embodiment, the jetting member 32 is a combination of a solenoid valve and a nozzle. The solenoid valve has high precision and can control the flow rate of the airflow. The solenoid valve is installed on the nozzle and is controlled by the pressure detector 31. When the solenoid valve is opened, the nozzle sprays airflow toward the bottle cap.

[0056] Further, refer to Figure 1 An annular protective plate 6 is arranged in the cap sorting barrel 1, and the protective plate 6 is arranged above the cap sorting plate 2 at intervals.

[0057] When pouring a number of bottle caps into the cap sorting barrel 1, the protective plate 6 will protect the detection structure 3, which can prevent the bottle caps from directly hitting the pressure detector 31 in the limiting groove 21 and causing the jet part 32 to respond, thereby ensuring that the detection structure 3 can operate normally.

[0058] In a specific embodiment, the inner circle of the protective plate 6 can be set to an arc surface / inclined surface. When the bottle caps are poured into the cap sorting barrel 1, some of the bottle caps intercepted on the protective plate 6 can fall smoothly onto the cap sorting plate 2 under the guidance of the arc surface / inclined surface.

[0059] Further, refer to Figure 2 and Figure 3 A limiting hole 22 is provided on the bottom wall of the limiting groove 21, and a limiting structure 4 is arranged between the bottom wall of the cover sorting barrel 1 and the cover sorting plate 2. One end of the limiting structure 4 is inserted into the limiting hole 22 and can slide along the axial direction of the limiting hole 22.

[0060] Specifically, the limiting structure 4 includes a ring plate 41, a limiting member 42 and an elastic member 43. The ring plate 41 is provided with an annular groove 411 and a notch; the opening position of the notch corresponds to the lower position of the lid sorting bucket 1; a plurality of limiting members 42 are provided, and the plurality of limiting members 42 are provided in a one-to-one correspondence with the plurality of limiting holes 22, and are slidably connected in the corresponding limiting holes 22; one end of the elastic member 43 is connected to the limiting member 42, and the other end extends into the annular groove 411.

[0061] During the rotation of the cap sorting plate 2 , the limiting structure 4 rotates synchronously with the cap sorting plate 2 . The operation state of the limiting structure 4 is described below by taking the motion state of a limiting member 42 as an example.

[0062] When the limiting member 42 is located near the discharge port 11, the elastic member 43 corresponding to the limiting member 42 is no longer in contact with the ring plate 41, and the elastic member 43 is in a natural state (in this embodiment, the limiting member 42 is in close contact with the peripheral side wall of the limiting hole 22, and there is friction between the limiting member 42 and the peripheral side wall of the limiting hole 22).

[0063] When the limiting member 42 is located at other positions, the elastic member 43 is in a compressed state and extends into the annular groove 411 . The limiting member 42 is subjected to the elastic force of the elastic element and is partially pushed out of the limiting hole 22 .

[0064] In this case, for the bottle cap facing the correct direction, the bottle cap will not only be limited by the groove wall of the limiting groove 21, but also further limited by the limiting member 42 (the limiting member 42 partially extends into the opening of the bottle cap and contacts the bottle cap). This method allows the bottle cap facing the correct direction to be better limited, reducing the possibility of the bottle cap sliding out of the limiting groove 21 during the process of moving from the lower position to the upper position.

[0065] As for the bottle caps facing the wrong direction, if they are still in the limiting groove 21, the limiting block 422 can also push the bottle caps out of the limiting groove 21 and slide down after the limiting block 422 is reset. In this way, when individual jet components 32 fail (for example, the jet components 32 cannot work or the air pressure is low), the bottle caps facing the wrong direction can still be screened out, thereby improving the reliability of the cap sorting and detection device.

[0066] Among them, the elastic member 43 can be specifically configured according to actual conditions. In a specific embodiment, the elastic member 43 can be configured as a spring. The spring has high elasticity and strength, which can ensure that the limit block 422 can stably move linearly in the limit hole 22, so that the detection device has high stability.

[0067] It should be noted that, in other specific embodiments, the elastic member 43 may also be configured in other suitable forms to ensure that the limiting structure 4 can operate stably.

[0068] Furthermore, considering the spring fatigue of the spring, in a specific embodiment, a plurality of annular snap-in grooves 12 are provided on the inner wall of the cap sorting barrel 1, and the plurality of snap-in grooves 12 are evenly distributed along the axial direction of the cap sorting barrel 1, and the ring plate 41 is installed in the cap sorting barrel 1 through any snap-in groove 12.

[0069] By adjusting the position of the ring plate 41 , when the spring's rebound force becomes weak, it can still ensure that the limiting member 42 can smoothly extend out of the limiting hole 22 by an appropriate distance, so that the limiting structure 4 can operate stably.

[0070] Further, refer to Figure 3 In a specific embodiment, a plurality of clamping plates are arranged on the inner side wall of the cap sorting barrel 1, and adjacent clamping plates are arranged at intervals to enclose the inner side wall of the cap sorting barrel 1 to form the above-mentioned clamping groove 12, and the clamping groove 12 is arranged around the cap sorting barrel 1 for half a circle, supporting the portion of the ring plate 41 corresponding to the first step surface 412 or the portion of the ring plate 41 corresponding to the second step surface 413.

[0071] It should be noted that, in another specific embodiment, a telescopic cylinder may also be provided, the output end of which is connected to the bottom side of the ring plate 41 , and the same effect can be achieved by adjusting the position of the ring plate 41 through the telescopic cylinder.

[0072] Reference Figure 3 and Figure 4 The limiting member 42 includes a limiting block 422 and a limiting ring 421. One end of the limiting block 422 is connected to the elastic member 43, and the limiting ring 421 is sleeved on the other end of the limiting block 422. A sliding groove 23 is provided on the side wall of the limiting hole 22. A movable member 5 is slidably arranged in the sliding groove 23. The movable member 5 includes a movable block 51 and a movable rod 52. The movable block 51 is slidably connected in the sliding groove 23.

[0073] Two movable rods 52 are provided, and the two movable rods 52 are arranged opposite to each other on the upper and lower sides of the movable block 51. The two ends of the upper movable rod 52 are respectively hinged to the limit ring 421 and the movable block 51, and the two ends of the lower movable rod 52 are respectively hinged to the limit block 422 and the movable block 51; the pressure detector 31 is arranged on the limit ring 421, and sinks into the limit hole 22 when the limit block 422 partially extends out of the limit hole 22.

[0074] The specific actions of the limit block 422 and the limit ring 421 are as follows:

[0075] When the limiting block 422 moves away from the ring plate 41 , the two movable rods 52 approach each other. Driven by the movable rods 52 , the limiting ring 421 moves toward the ring plate 41 .

[0076] In this way, the limit block 422 is positioned higher than the corresponding pressure detector 31. When there is no bottle cap in a certain limit slot 21 or the bottle cap is pushed out, if the bottle cap is poured into the cap sorting barrel 1 (i.e., loading is performed), the limit block 422 can better protect the pressure detector 31.

[0077] Furthermore, considering that installing the jet component 32 in the limit groove 21 requires further drilling in the limit groove 21 (the output end of the jet component 32 needs to be flush with the bottom wall of the limit groove 21), in a specific embodiment, the jet component 32 is arranged in the limit block 422, so that the limit structure 4 and the detection structure 3 are more compact, the spatial layout is more reasonable, and at the same time, it also ensures that the cover plate 2 has a higher strength.

[0078] In addition, it should be noted that in the present application, the extension of the limit block 422 and the sinking of the limit ring 421 are both movements along the axial direction of the movable hole. The extension of the limit block 422 is movement away from the ring plate 41, and the sinking of the limit ring 421 is movement toward the ring plate 41.

[0079] The hinge point where the two movable rods 52 are hinged to each other can make an arc motion or a linear motion along the plane of the cover arrangement plate 2. When the movable rods 52 make a linear motion along the plane of the cover arrangement plate 2, the movable rods 52 need to be configured to be retractable.

[0080] Furthermore, combined with Figure 2 A first step surface 412 and a second step surface 413 are provided on the ring plate 41 . The first step surface 412 is provided lower than the second step surface 413 . When the limiting block 422 is above the second step surface 413 , it partially extends out of the limiting hole 22 .

[0081] When the limit block 422 is located above the first step surface 412, the upper end surfaces of the limit block 422 and the limit ring 421 are flush with the bottom wall of the limit groove 21. When the limit block 422 is located above the second step surface 413, the upper end surface of the limit block 422 is higher than the bottom wall of the limit groove 21, and the upper end surface of the limit ring 421 is lower than the bottom wall of the limit groove 21.

[0082] It should be noted that the first step surface 412 in the present application is close to the discharge port 11 (in other words, the first step surface 412 is located at the lower position). With the help of the forward movement of the limit block 422, the limit ring 421 can be hidden in the limit hole 22 in time, so that the limit member 42 can also play a role in combing the bottle cap and protecting the pressure detector 31.

[0083] Furthermore, in a specific embodiment, there is a smooth transition between the first step surface 412 and the second step surface 413 , so that the elastic member 43 can smoothly transition from the first step surface 412 to the second step surface 413 , thereby ensuring the stable operation of the limiting structure 4 .

[0084] In addition, refer to Figure 2 and Figure 3 A ball 44 is provided at one end of the elastic member 43 facing the ring plate 41. When the elastic member 43 slides along the ring groove 411, the ball 44 can reduce the friction between the elastic member 43 and the bottom wall of the ring groove 411, thereby reducing the wear between the elastic member 43 and the ring plate 41.

[0085] In addition, the present application also discloses a capping machine, including a conveying device, a capping device and the above-mentioned cap sorting and detecting device. After the bottle caps are sorted in the cap sorting and detecting device, they are conveyed to the capping structure through the conveying structure, and the capping structure installs the bottle caps on the container bottles and performs the capping process.

[0086] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A cap sorting and detecting device, characterized in that: include: A cap sorting barrel (1), wherein the cap sorting barrel (1) is arranged at an angle and is provided with a discharge port (11); A cap sorting plate (2) is rotatably connected to the cap sorting barrel (1), and a plurality of limiting grooves (21) are provided on the top surface of the cap sorting plate (2), and the plurality of limiting grooves (21) are arranged around the cap sorting plate (2); A detection structure (3), wherein each of the limiting grooves (21) is provided with the detection structure (3), the detection structure (3) comprising a pressure detector (31) and an air injection member (32), the pressure detector (31) being located at the center of the limiting groove (21); The pressure detector (31) is connected to the jet component (32), and when the pressure detector (31) detects pressure, the jet component (32) is controlled to spray air to push the bottle cap out of the limiting groove (21).

2. A cap sorting and detecting device according to claim 1, characterized in that: A limiting hole (22) is provided on the bottom wall of the limiting groove (21); a limiting structure (4) is provided between the bottom wall of the cap sorting barrel (1) and the cap sorting plate (2); a portion of the limiting structure (4) is inserted into the limiting hole (22) and is capable of sliding along the axial direction of the limiting hole (22).

3. The cap sorting and detecting device according to claim 2, characterized in that: The limiting structure (4) comprises: The ring plate (41) is provided with a ring groove (411); A plurality of limiting members (42) are provided, and the plurality of limiting members (42) are provided in one-to-one correspondence with the plurality of limiting holes (22) and are slidably connected in the corresponding limiting holes (22); An elastic member (43) has one end connected to the limiting member (42) and the other end extending into the annular groove (411).

4. The cap sorting and detecting device according to claim 3, characterized in that: The limiting member (42) comprises: A limit block (422), one end of which is connected to the elastic member (43); A limiting ring (421) is sleeved on the other end of the limiting block (422); The side wall of the limiting hole (22) is provided with a sliding groove (23), and a movable member (5) is slidably arranged in the sliding groove (23), and the movable member (5) comprises: A movable block (51) is slidably connected in the slide groove (23); Two movable rods (52) are provided, and the two movable rods (52) are arranged oppositely at the upper and lower sides of the movable block (51), and the two ends of the upper movable rod (52) are respectively hinged to the limiting ring (421) and the movable block (51), and the two ends of the lower movable rod (52) are respectively hinged to the limiting block (422) and the movable block (51); The pressure detector (31) is arranged on the limiting ring (421) and sinks into the limiting hole (22) when the limiting block (422) extends forward.

5. The cap sorting and detecting device according to claim 4, characterized in that: The ring plate (41) is provided with a first step surface (412) and a second step surface (413); the first step surface (412) is arranged lower than the second step surface (413); and the limit block (422) partially extends out of the limit hole (22) when it is above the second step surface (413).

6. The cap sorting and detecting device according to claim 5, characterized in that: There is a smooth transition between the first step surface (412) and the second step surface (413).

7. A cap sorting and detecting device according to claim 3 or 4, characterized in that: A ball (44) is provided at one end of the elastic member (43) facing the ring plate (41).

8. The cap sorting and detecting device according to claim 3, characterized in that: A plurality of annular snap-fit ​​grooves (12) are arranged on the inner wall of the cap sorting barrel (1), and the plurality of snap-fit ​​grooves (12) are evenly distributed along the axial direction of the cap sorting barrel (1), and the ring plate (41) is installed in the cap sorting barrel (1) through any of the snap-fit ​​grooves (12).

9. The cap sorting and detecting device according to claim 1, characterized in that: An annular protective plate (6) is arranged in the cap sorting barrel (1), and the protective plate (6) is arranged above the cap sorting plate (2) at intervals.

10. A capping machine, characterized in that: It comprises a conveying device, a capping device and a cap sorting and detecting device as claimed in any one of claims 1 to 9.

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