Leveling device used before cap screwing

Abstract

The invention relates to a leveling device used before cap screwing, and belongs to the technical field of sealing equipment. The before-cap-screwing leveling device comprises a cap feeding mechanism, a reverse screwing mechanism and a conveying mechanism, and the conveying mechanism conveys bottle bodies along a set path; the cap feeding mechanism is arranged along the conveying path and used for placing the bottle caps on bottle openings of the bottle bodies. The reverse rotation mechanism is arranged on the downstream of the upper cover mechanism and comprises a first reverse rotation assembly and a second reverse rotation assembly; the first reverse rotation assembly and the second reverse rotation assembly rotate in the same direction and have a rotating speed difference therebetween; the linear velocity direction of the contact parts of the first reverse rotation assembly and the second reverse rotation assembly with the bottle cap is the same as the direction of conveying the bottle body; the reverse rotation mechanism drives the bottle cap to rotate in the unscrewing direction when the bottle cap is placed on the bottle opening, and the bottle cap is pressed to the bottle opening while rotating, so that the end face of the bottle cap is aligned with the end face of the bottle opening in parallel. According to the leveling device before cap screwing, the inclined state of the bottle cap can be corrected, and conveying interference on the bottle body is small.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sealing equipment, in particular to a pre-adjusting device for screwing a cap. BACKGROUND

[0002] In many fields such as beverages, food, pharmaceuticals and chemicals, bottled products are produced on a large scale. The screwing process is a key link to ensure the sealing of bottled products. In actual operation, after the cap is initially placed on the bottle mouth by the upper cap mechanism, there are often problems such as inclination, misalignment or thread misalignment. If direct tightening is performed, it is easy to cause thread damage, poor sealing or cap body skew, affecting the appearance and shelf life of the product. Therefore, it is particularly important to adjust the posture and pre-align the cap before formal screwing.

[0003] Traditional cap adjusting or aligning methods mostly use passive correction structures such as mechanical baffles and guide grooves, relying on collision and friction during bottle body conveying to gradually correct the cap posture. Such methods have low adjustment efficiency, poor fault tolerance for the initial position of the cap, and are prone to cause the cap to fall off or the bottle to tip over due to interference. Some improved schemes use active rotation adjustment, for example, using a single friction wheel or a pair of counter-rotating friction wheels to drive the cap to rotate, so that it automatically aligns under the action of centrifugal force or friction torque. However, although the double-wheel device with counter-rotating can provide rotation torque, the friction force directions of the two contact points are opposite, which is easy to form shear force on the side wall of the cap, and may cause unnecessary lateral slip or posture disturbance for light or special-shaped caps, affecting the alignment accuracy. In addition, if the rotation driving direction is inconsistent or opposite to the bottle body conveying direction, it may generate additional resistance during the adjustment process, hindering the smooth conveying of the bottle body, and even need to set a pause station, affecting the continuity of the production line.

[0004] Therefore, there is an urgent need in the industry for a device that can automatically correct the inclination of the cap and eliminate undesirable pre-engagement before the tightening action begins, to improve the success rate of the cap sealing process and product quality. SUMMARY

[0005] The present application aims to solve the above problems by providing a pre-adjusting device for screwing a cap, which can correct the inclination of the cap and eliminate undesirable pre-engagement, and has less interference with the conveying of the bottle body, so that the above problems are improved.

[0006] The present application is achieved by the following technical solutions: The application provides a pre-capping levelling device, which comprises a cap lifting mechanism, a counter-rotation mechanism and a conveying mechanism, the conveying mechanism is used for conveying a bottle along a set path; the cap lifting mechanism is arranged along the conveying path and is used for placing a cap on the mouth of the bottle; the counter-rotation mechanism is arranged downstream of the cap lifting mechanism along the conveying path and comprises a first counter-rotation component and a second counter-rotation component which are symmetrically arranged with the axis of the bottle as the centre, both of which are configured to press the top surface of the cap; wherein the first counter-rotation component and the second counter-rotation component are driven to rotate in the same direction and have a rotational speed difference therebetween to jointly drive the cap to rotate around its axis; the linear velocity direction of the contact part of the first counter-rotation component and the second counter-rotation component with the cap is the same as the conveying direction of the conveying mechanism; the counter-rotation mechanism is configured to drive the cap to rotate in the loosening direction and press the cap towards the mouth of the bottle at the same time in the initial state of placing the cap on the mouth of the bottle, so that the end surface of the cap is aligned with the end surface of the mouth of the bottle.

[0007] In the technical scheme of the embodiment of the application, the counter-rotation mechanism drives the cap to rotate and press downwards, instead of the traditional passive collision type deviation correction, can quickly and reliably make the cap parallel to the end surface of the mouth of the bottle, eliminates the inclination caused by improper placement or conveying shaking and avoids the mislocking phenomenon during capping. Rotating the cap in the loosening direction can effectively release the local pre-engagement between the cap and the threads of the mouth of the bottle, prevent the cap from deforming or the bottle from toppling caused by stress concentration when the cap is started to be rotated. After levelling, the threads of the cap are correctly aligned with the threads of the mouth of the bottle, the capping machine can start to tighten from the same position, avoids over-rotation or incorrect judgment of the tightening point, improves the sealing performance and product qualification rate. The pre-capping levelling device provided by the application adopts the design of two components rotating in the same direction and having a rotational speed difference, instead of the traditional reverse rotation friction wheel, so that the friction force directions of the two contact points are coordinated, avoiding the shear force acting on the side wall of the cap caused by reverse rotation. This reduces the risk of lateral disturbance to light or special-shaped caps, prevents the cap from accidentally jumping off or losing control during the levelling process, and makes the levelling process more gentle and stable. The linear velocity direction of the contact point of the counter-rotation component and the cap is consistent with the conveying direction of the bottle, which means that the resistance of the levelling action to the forward movement of the bottle is very small. The bottle hardly needs to stop or only needs to slide at a very low speed during the levelling process, realizes dynamic online levelling and guarantees the continuous and smooth operation of the production line, overcoming the problem of setting a stop station or interfering with the conveying in the traditional way.

[0008] In some embodiments, the second counter-rotation component has the same structure as the first counter-rotation component; the first counter-rotation component comprises a plurality of transmission rollers and a synchronous belt; the synchronous belt is sleeved and tensioned outside the plurality of transmission rollers; the synchronous belt is used for abutting against the cap and is driven to rotate by the transmission rollers; the moving direction of the side of the synchronous belt abutting against the cap is the same as the conveying direction of the bottle.

[0009] The technical scheme of the embodiment of the application provides a large area and flexible contact for the bottle cap by the synchronous belt, avoids point contact stress concentration or surface scratches caused by a rigid pressure head. The speed difference is gently converted into the rotating power of the bottle cap by the friction of the belt, the leveling process is stable and reliable, and is suitable for high-speed continuous production. The working side of the synchronous belt moves in the same direction with the bottle cap, which means that the relative speed between the bottle cap and the leveling mechanism is small. This significantly reduces the sliding friction, reduces the risk of wear on the surface of the bottle cap, and also reduces the conveying force required to drive the bottle cap forward. The two counter-rotation assemblies have the same structure, which simplifies the management and manufacturing of parts. The symmetrical layout makes the force on the bottle cap more balanced during the leveling process, which helps to improve the leveling accuracy and stability.

[0010] In some embodiments, the counter-rotation mechanism further comprises a rotating motor; the first counter-rotation assembly and the second counter-rotation assembly are both connected to the output end of the rotating motor; among the plurality of transmission rollers, the roller directly connected to the output end of the rotating motor is defined as the driving roller; the driving rollers of the first counter-rotation assembly and the second counter-rotation assembly are coaxially arranged and synchronously rotate under the drive of the rotating motor; the diameters of the driving rollers of the first counter-rotation assembly and the second counter-rotation assembly are different, so that a linear speed difference is generated between the synchronous belts of the first counter-rotation assembly and the second counter-rotation assembly, and a speed difference for driving the bottle cap to rotate is formed.

[0011] In the technical scheme of the embodiment of the application, a single rotating motor is used in combination with coaxial but different-diameter driving rollers, and only the simplest mechanical components (motor, shaft, and different-diameter rollers) are used to realize the core function of same-direction differential speed. Since the speed difference is derived from fixed mechanical dimensions (roller diameter ratio), as long as the motor is running, the linear speed difference between the two counter-rotation assemblies is a constant value. This eliminates the complexity of fluctuations, delays, or feedback adjustments that may exist in electronic speed regulation, making the rotation of the bottle cap stable and predictable, and suitable for high-speed and continuous production rhythm. The two driving rollers are coaxially arranged and synchronously rotate by the same motor, which ensures that the starting, stopping, and rotation phase of the driving actions on both sides are completely synchronized from the power source. This avoids the slight timing or response differences that may exist in double independent motor driving, ensures the instantaneous consistency of the actions on both sides of the bottle cap, and prevents the bottle cap from being momentarily stuck or tilted due to asynchronous actions.

[0012] In some embodiments, the synchronous belt abuts against the edge region where the top wall and the side wall of the bottle cap meet; and the action line of the pressing force applied by the synchronous belt to the bottle cap intersects with the central axis of the bottle cap.

[0013] In the technical solution of the embodiment of the application, the synchronous belt of the first and second anti-rotation assemblies applies the pressing force near the center axis of the bottle cap, avoiding additional overturning moment caused by the deviation of the pressing force from the center. This ensures the stable posture of the bottle cap during the entire leveling process, and prevents new and additional tilting during pressing and rotation, so that the leveling action is accurate and reliable. The contact point is located at (or near) the maximum diameter of the bottle cap, and according to the principle of the lever, the force arm at this point is the longest. Therefore, the synchronous belt only needs to apply a small friction force to generate sufficient rotation moment to drive the bottle cap to unscrew. This reduces the requirements for the pressing force and friction coefficient of the synchronous belt, making the driving more lightweight and efficient. If the synchronous belt is pressed near the center of the top surface of the bottle cap, a component that causes the bottle cap to tilt upward may be generated during rotation driving. In the embodiment, however, since the pressing force and the rotation driving force are applied to the area far from the center, the force acting path passes through the center of gravity of the bottle cap, which suppresses the axial movement (climbing) or radial jumping of the bottle cap that may occur during the leveling process, making the process more stable. For bottle caps with spherical or complex top surfaces, the central region of the top wall may not provide a stable contact surface. The edge region between the top wall and the side wall is usually a relatively stable and reliable force point in structure, so that the cap leveling device provided by the application also has excellent adaptability to such bottle caps.

[0014] In some embodiments, the outer side of the synchronous belt forms a limiting groove, and the limiting groove is shaped to match the edge region of the bottle cap.

[0015] In the technical solution of the embodiment of the application, the introduction of the limiting groove upgrades the previous surface contact or line contact constraint to a geometric constraint of profile matching. Any radial movement or circumferential slipping that may occur during the leveling process of the bottle cap is eliminated, ensuring the absolute accuracy and reliability of the leveling action. Since the limiting groove increases the contact area and prevents slipping, the synchronous belt can convert the speed difference into the rotation of the bottle cap with almost no loss. This enables the cap leveling device provided by the application to easily and stably complete the unscrewing action even in the case of tight pre-engagement between the bottle cap and the bottle mouth, avoiding leveling failure caused by slipping. The limiting groove that matches the edge of the bottle cap is a natural centering mechanism itself. Even if the bottle cap has a slight initial eccentricity when it enters, it can be automatically guided to the center position during the process of entering the limiting groove, reducing the requirement for the positioning accuracy of the conveying.

[0016] In some embodiments, the anti-rotation mechanism further comprises a lifting member, and the transmission drum is installed on the lifting member and driven by the lifting member to lift the transmission drum and the synchronous belt as a whole.

[0017] The technical scheme of the embodiment of the application realizes isolation of the leveling mechanism and the conveying flow through the lifting action of the lifting member. In the non-working period, the two are completely separated, eliminating any possible interference, collision or friction, and being suitable for high-speed, high-density or conveying lines with non-absolute stable bottle posture. The lifting stroke can be flexibly adjusted and programmed according to the height of different bottle caps. This enables the same leveling device to easily adapt to various products from small medicine bottle caps to large beverage bottle caps, greatly enhancing the flexibility of the production line.

[0018] In some embodiments, the transmission drum is rotatably arranged on the mounting bracket; among the plurality of transmission drums, the transmission drum that first contacts the bottle cap when the bottle body enters the cap screwing station is defined as an entry drum; the entry drum is movably arranged on the mounting bracket and is configured to displace relative to the mounting bracket when the extrusion force from the bottle cap exceeds a threshold value to avoid the bottle cap.

[0019] In the technical scheme of the embodiment of the application, the design of the movable entry drum that avoids excessively inclined bottle caps enables the leveling device to safely and stably handle bottle caps in various abnormal states, especially severely inclined problem bottle caps, minimizing the risk of production interruption and ensuring continuous and stable operation of the entire production line. Through the active avoidance of the entry drum instead of hard collision, the huge stress caused by jamming is avoided, effectively protecting the bottle cap, the bottle body, and the transmission drum, the synchronous belt and the driving mechanism of the leveling device itself, prolonging the service life of the equipment, and eliminating secondary problems caused by bottle dumping. The entry drum changes from a fixed type to a displaceable type, which is equivalent to adding an intelligent and flexible buffer guide mechanism to the bottle cap entry. It can not only allow abnormal bottle caps to pass through, but also ensure that normal bottle caps still obtain the necessary initial contact and compression, achieving both purposes. The avoidance mechanism of the entry drum allows abnormal bottle caps to enter, the leveling function of the first and second reverse rotation assemblies corrects the abnormal state of the bottle cap, and the corrected bottle cap no longer triggers subsequent avoidance. This makes the device not only tolerate abnormalities, but also repair abnormalities, finally output a bottle cap that meets the requirements, ensuring the final quality of the production process.

[0020] In some embodiments, the rotating shaft of the entry drum is slidably arranged in the guide groove of the mounting bracket through the connecting piece; the guide groove is provided with an elastic member, which provides the entry drum with a pre-tightening force for abutting against the bottle cap; when the extrusion force from the bottle cap exceeds the threshold value, the rotating shaft of the entry drum compresses the elastic member through the connecting piece and moves along the guide groove to avoid the bottle cap.

[0021] In the technical scheme of the embodiment of the application, the entrance roller realizes passive avoidance through an elastic member in a pure mechanical and instantaneous response manner. The avoidance is triggered immediately at the moment of collision, the response speed is extremely fast, the reliability is extremely high, and the production environment is suitable for high speed and high frequency. The guiding and elastic reset functions are integrated in the guiding groove of the mounting bracket, and the structure is very compact. The entire avoidance mechanism has good rigidity, stable action, is not easy to be damaged, and has a long service life. The elastic member provides stable and quantifiable pre-tightening force for the entrance roller. By replacing springs with different stiffness or adjusting the pre-compression amount of the spring, the avoidance force threshold can be accurately set and adjusted to adapt to bottle caps of different weights and materials. The guiding groove not only guides the avoidance direction, but also ensures that the entrance roller can return to the initial position along the accurate path after avoidance, ensures the repeatability of the tension of the synchronous belt and the working position, and avoids the decline of the performance of the device due to the avoidance action.

[0022] In some embodiments, an adjustable position tensioning wheel is further arranged on the mounting bracket; the wheel shaft of the tensioning wheel is arranged to be adjustable in a direction perpendicular to the axis of the transmission roller, and the synchronous belt is tensioned or loosened by moving the tensioning wheel.

[0023] In the technical scheme of the embodiment of the application, moderate and stable tension is the basis for the synchronous belt to reliably transmit power and prevent slipping or tooth skipping. The position-adjustable tensioning wheel can accurately adjust the tension of the synchronous belt to the optimal range, thereby ensuring the torque stability and speed accuracy of the first counter-rotation assembly and the second counter-rotation assembly to drive the bottle cap to rotate. The synchronous belt will naturally wear and slightly plastically elongate after long-term use, resulting in a decrease in tension. The design allows the original tension to be quickly restored without replacing the belt, compensates for wear and elongation, extends the service life of the synchronous belt and the entire transmission system, and reduces the maintenance frequency and cost.

[0024] In some embodiments, the upper cover mechanism includes a slide and a liftable stopper. The slide is used to guide the bottle cap to slide to the end thereof and to be placed on the bottle mouth of the bottle body. The stopper is arranged on the outlet side of the slide. The stopper includes a first section and a second section connected in series along the length direction thereof. The inclination angle of the first section with respect to the conveying direction of the bottle body is greater than the inclination angle of the second section. A part of the first section is opposite to the bottom wall of the slide, and a gap for a single bottle cap to pass through is left between the part and the bottom wall. When the bottle cap is placed on the bottle mouth and is conveyed with the bottle body, the top surface of the bottle cap will be in contact with the first section and the second section of the stopper in sequence and is pushed to preliminarily adjust the posture.

[0025] In the technical scheme of the embodiment of the application, the kinetic energy of the bottle body itself is utilized, and a stationary block with a specific profile is used to automatically adjust the posture of the bottle cap in the conveying process. The scheme does not need additional driving or control actions, and can correct the serious inclination of the bottle cap to a smaller range, reduces the working load and leveling difficulty of the reverse rotation mechanism, and improves the robustness and success rate of the whole process.

[0026] Additional aspects and advantages of the application will be set forth in part in the following description, will become apparent from the following description, or will be learned through practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme of the embodiment of the application, the following will briefly introduce the drawings needed to be used in the embodiment. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0028] Figure 1 A structural schematic view of the cap leveling device before cap screwing in the production line provided by some embodiments of the application is shown in the figure. Figure 2 A top view of the cap leveling device before cap screwing in the production line provided by some embodiments of the application is shown in the figure. Figure 3 A sectional view of A-A in the figure. Figure 2 Figure 4 A structural schematic view of the reverse rotation mechanism provided by some embodiments of the application is shown in the figure. Figure 5 An enlarged view of A in the figure. Figure 4 A side view of the reverse rotation mechanism provided by some embodiments of the application is shown in the figure. Figure 6 A structural schematic view of the cap leveling device before cap screwing in the production line provided by some other embodiments of the application is shown in the figure. Figure 7 A front view of the reverse rotation mechanism provided by some embodiments of the application is shown in the figure. Figure 8 A structural schematic view of the first reverse rotation component provided by some embodiments of the application is shown in the figure. Figure 9 A structural schematic view of the cap leveling device before cap screwing in the production line provided by some other embodiments of the application is shown in the figure. Figure 10 An enlarged view of B in the figure. Figure 11 Figure 10

[0029] ​​​Icon: 1- counter-rotating mechanism; 10- first counter-rotating assembly; 100- transmission drum; 101- inlet drum; 1010- connecting piece; 102- synchronous belt; 1020- limiting groove; 103- lifting piece; 104- mounting bracket; 1040- guide groove; 1041- elastic piece; 105- driving drum; 11- second counter-rotating assembly; 12- tensioning wheel; 13- rotating motor; 2- bottle cap; 3- bottle body; 4- upper cover mechanism; 40- slide; 41- stop block; 410- first section; 411- second section; 5- conveying mechanism. DETAILED DESCRIPTION

[0030] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application and the above description of drawings are used to distinguish different objects, rather than to describe a particular order or primary and secondary relationship.

[0032] In the present application, the phrase "embodiment" means that the specific features, structures or properties described in conjunction with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0033] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "attachment" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] The term "and / or" in the present application is only used to describe the relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0035] The "multiple" appearing in the present application refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0036] According to some embodiments of the present application, optionally, as shown in Figures 1-6 The present application provides a cap pre-adjusting device, which comprises a cap mechanism 4, a counter-rotating mechanism 1 and a conveying mechanism 5, the conveying mechanism 5 is used to convey the bottle body 3 along a set path; the cap mechanism 4 is arranged along the conveying path and is used to place the bottle cap 2 on the bottle mouth of the bottle body 3; the counter-rotating mechanism 1 is arranged downstream of the cap mechanism 4 along the conveying path and comprises a first counter-rotating assembly 10 and a second counter-rotating assembly 11 which are symmetrically arranged with the axis of the bottle body 3 as the center, both of which are configured to press the top surface of the bottle cap 2; wherein the first counter-rotating assembly 10 and the second counter-rotating assembly 11 are driven to rotate in the same direction and have a speed difference between them to jointly drive the bottle cap 2 to rotate around its axis; the linear velocity direction of the contact part between the first counter-rotating assembly 10 and the second counter-rotating assembly 11 and the bottle cap 2 is the same as the conveying direction of the conveying mechanism 5 for the bottle body 3; the counter-rotating mechanism 1 is configured to drive the bottle cap 2 to rotate in the loosening direction and press the bottle cap 2 towards the bottle mouth at the same time in the initial state when the bottle cap 2 is placed on the bottle mouth, so that the end surface of the bottle cap 2 is aligned with the end surface of the bottle mouth.

[0037] The cap pre-adjusting device provided by the present application can be applied to the processing of screw thread bottle caps 2 and bottle mouths made of various materials, including plastic, glass or metal materials, etc., and has certain adaptability to the size changes of the bottle cap 2.

[0038] The linear velocity of the contact part between the first counter-rotating assembly 10 and the second counter-rotating assembly 11 and the bottle cap 2 is not less than the conveying speed of the bottle body 3.

[0039] In actual application, the bottle body 3 is continuously forwarded along a set straight path by a conveying mechanism 5 (e.g. a conveying belt). When the bottle body 3 passes under the cap mechanism 4, a cap 2 is released and initially placed on the bottle mouth. At this time, the cap 2 is usually in a natural state, which can be skewed or misaligned with the threads of the bottle mouth. The bottle body 3 carrying the cap 2 in this unstable state continues to move forward into the working area of the counter-rotation mechanism 1. The first counter-rotation assembly 10 and the second counter-rotation assembly 11 (e.g. two friction wheels or rotating arms with friction surfaces driven by independent motors) are symmetrically pressed against the top surface (i.e. the cap top) of the cap 2 from both sides above the cap 2. The first counter-rotation assembly 10 and the second counter-rotation assembly 11 are driven to rotate in the same direction (e.g. both rotate in the clockwise direction), but their rotational speeds are set to have a slight difference. Since both assemblies press against the top of the cap 2 and rotate in the same direction, the frictional forces they exert on the cap 2 are substantially consistent in direction on the same side of the cap 2. This resultant force drives the cap 2 to rotate around its own axis. At the same time, the line speeds of the contact points between the two counter-rotation assemblies and the cap 2 are set to be exactly the same as the conveying direction of the bottle body 3. In the initial stage when the cap 2 is only placed on the bottle mouth, the device is configured to drive the cap 2 to rotate in the loosening direction (i.e. the opposite direction to the final tightening direction). During this reverse rotation, the downward pressing force of the counter-rotation assemblies gently and stably presses the cap 2 against the end surface of the bottle mouth. As the cap 2 rotates, the threads or guide structures inside the cap 2 and the threads of the bottle mouth continuously attempt to engage, and due to the rotation and continuous downward pressure, the end surface of the cap 2 gradually aligns with the end surface of the bottle mouth, eliminating the initial skew and misalignment. After the alignment is completed, the bottle body 3 carrying the cap 2 with the aligned end surfaces is smoothly conveyed to the downstream official cap screwing machine station for tightening.

[0040] The anti-rotation mechanism 1 replaces the traditional passive collision type deviation correction by actively driving the bottle cap 2 to rotate and press down, can quickly and reliably make the bottle cap 2 parallel to the end face of the bottle mouth, eliminates the tilt caused by improper placement or conveying shaking, and avoids the mislatch phenomenon during cap rotation. Rotating the bottle cap 2 in the loosening direction can effectively release the local pre-engagement between the bottle cap 2 and the bottle mouth thread, prevent the stress concentration caused by the deformation of the bottle cap 2 or the tilting of the bottle body 3 during cap rotation. After leveling, the bottle cap 2 thread is correctly aligned with the bottle mouth thread, and the cap tightening machine can start from the same position, avoiding over-rotation or incorrect rotation point judgment, improving the sealing performance and product qualification rate. The cap leveling device before rotation provided in the application adopts a dual-component design with same direction rotation and speed difference, replacing the traditional counter-rotating friction wheel, so that the friction force directions of the two contact points on the bottle cap 2 are coordinated, avoiding the shear force acting on the side wall of the bottle cap 2 caused by counter-rotation. This reduces the risk of lateral disturbance to light or special-shaped bottle caps 2, prevents accidental jumping or attitude loss of the bottle cap 2 during leveling, and makes the leveling process more gentle and stable. The line speed direction of the contact point between the anti-rotation component and the bottle cap 2 is consistent with the conveying direction of the bottle body 3, which means that the resistance of the leveling action to the forward movement of the bottle body 3 is very small. The bottle body 3 hardly needs to stop or only needs to slide at a very low speed during leveling, realizing dynamic online leveling and ensuring the continuous and smooth operation of the production line, overcoming the problem of setting a stop station or interfering with the conveying in the traditional way.

[0041] The pressing action of the first anti-rotation component 10 and the second anti-rotation component 11 is prior to or synchronous with the rotation action. This ensures that the bottle cap 2 is stably pressed before starting to rotate, preventing the bottle cap 2 from bouncing or changing position due to impact during the initial rotation stage.

[0042] In the specific implementation process, one of the first anti-rotation component 10 and the second anti-rotation component 11 can not be driven to rotate, and the anti-rotation component that is not directly driven (driven component) is designed as a free-rotation follow-up structure. When the driving component drives the bottle cap 2 to rotate, the follow-up component can rotate synchronously to reduce the friction loss of the bottle cap 2.

[0043] According to some embodiments of the application, as shown in Figures 1-3 The rotation axis of the first anti-rotation component 10 and / or the second anti-rotation component 11 is perpendicular to the conveying direction of the bottle body 3.

[0044] In actual application, the first and second anti-rotation assemblies 10 and 11 are arranged above the conveying line, and the rotation axes thereof are arranged perpendicular to the conveying direction of the bottle body 3. The bottle body 3 moves to the leveling station along the conveying line in a certain direction. The first and second anti-rotation assemblies 10 and 11 contact and press the bottle cap 2. At this time, since the rotation axes thereof are perpendicular to the conveying direction, the plane for driving the bottle cap 2 to rotate is parallel to the conveying direction. At least one assembly is driven to drive the bottle cap 2 to rotate in a plane perpendicular to the conveying direction.

[0045] The rotation axes of the first and second anti-rotation assemblies 10 and 11 are arranged perpendicular to the conveying direction, which is most consistent with the physical space structure of most linear production lines. The driving unit can be arranged on the support along the direction of the production line, which greatly saves the transverse space, makes the equipment structure more compact, and is convenient for integration into the existing production line. The rotation direction of the bottle cap 2 is decoupled from the conveying advancing direction of the bottle body 3. The two are in an orthogonal relationship, which avoids unnecessary interference or coupling effect of the cap screwing action on the position of the bottle body 3 in the conveying direction, and ensures the stability of the bottle body 3 in the leveling process.

[0046] Even if the bottle cap 2 seems to be placed correctly, the threads thereof and the threads of the bottle mouth can have a local pre-engagement that is difficult to detect with the naked eye. The first and second anti-rotation assemblies 10 and 11 forcibly loosen all bottle caps 2, which can eliminate any form of pre-engagement and prevent a series of problems such as stress concentration, deformation of the bottle cap 2, and inaccurate judgment of the tightening point. After the leveling station, all bottle caps 2 are uniformly adjusted to a known and certain slightly loosened state. This makes the torque control and time control of the subsequent cap screwing machine have a consistent starting reference when tightening, greatly improves the consistency and reliability of the tightening and sealing quality, and avoids over-tightening or insufficient tightening.

[0047] According to some embodiments of the present application, optionally, as shown in Figures 3-6 The first anti-rotation assembly 10 includes a plurality of transmission rollers 100 and a synchronous belt 102. The synchronous belt 102 is sleeved and tensioned outside the plurality of transmission rollers 100. The synchronous belt 102 is used to abut against the bottle cap 2 and is driven to rotate by the transmission rollers 100. The moving direction of one side of the synchronous belt 102 abutting against the bottle cap 2 is the same as the conveying direction of the bottle body 3.

[0048] The synchronous belt 102 mentioned in the present application is a ring-shaped transmission belt with teeth on the inner side. The teeth on the synchronous belt 102 engage with the teeth on the outer surface of the transmission drum 100. The engagement between the teeth avoids the relative sliding between the synchronous belt 102 and the transmission drum 100, ensuring that the rotation speeds of the two are completely synchronized. The engagement transmission can stably transmit the torque, making the movement speed and direction of the synchronous belt 102 completely meet the design requirements, and avoiding the fast and slow rotation of the bottle cap 2.

[0049] In actual application, when the bottle cap 2 is conveyed to be directly below the first counter-rotation assembly 10 and the second counter-rotation assembly 11, the top of the bottle cap 2 will simultaneously contact and be slightly pressed by the working sides of the synchronous belts 102 of the first counter-rotation assembly 10 and the second counter-rotation assembly 11. Since both of the synchronous belts 102 contact the top of the bottle cap 2 and move in the same direction but at different speeds, the frictional forces exerted by the two synchronous belts 102 on the bottle cap 2 jointly generate a rotational torque around the central axis of the bottle cap 2. The synchronous belt 102 with a faster speed (such as the one belonging to the first counter-rotation assembly 10) will try to lead the bottle cap 2, while the synchronous belt 102 with a slower speed will produce relative resistance. The speed difference effectively drives the bottle cap 2 to rotate in a loosening direction around its own axis. Since the moving direction of the synchronous belt 102 is consistent with the conveying direction of the bottle body 3, the synchronous belt 102 slightly interferes with the straight-line forward movement of the bottle body 3 while driving the bottle cap 2 to rotate, so that the bottle cap 2 can pass through the leveling station very stably and continuously without stopping.

[0050] The synchronous belt 102 provides a large-area and flexible contact for the bottle cap 2, avoiding the point contact stress concentration or surface scratches that may be caused by a rigid pressing head. The rotational speed difference is softly converted into the rotational power of the bottle cap 2 by the frictional force of the belt, and the leveling process is stable and reliable, which is suitable for high-speed continuous production. The working side of the synchronous belt 102 moves in the same direction as the bottle cap 2, which means that the relative speed between the bottle cap 2 and the leveling mechanism is very small. This significantly reduces the sliding friction, reduces the risk of wear on the surface of the bottle cap 2, and also reduces the conveying force required to drive the bottle cap 2 to move forward. The two counter-rotation assemblies have the same structure, which simplifies the management and manufacturing of parts. The symmetrical layout makes the force on the bottle cap 2 more balanced during the leveling process, which helps to improve the leveling accuracy and stability.

[0051] According to some embodiments of the present application, optionally, Figures 3-6As shown, the anti-rotation mechanism 1 further comprises a rotating motor 13; the first anti-rotation assembly 10 and the second anti-rotation assembly 11 are both connected to the output end of the rotating motor 13; among the plurality of transmission rollers 100, the one directly connected to the output end of the rotating motor 13 is defined as the driving roller 105; the driving roller 105 of the first anti-rotation assembly 10 and the driving roller 105 of the second anti-rotation assembly 11 are coaxially arranged and synchronously rotate under the driving of the rotating motor 13; the diameter of the driving roller 105 of the first anti-rotation assembly 10 and the diameter of the driving roller 105 of the second anti-rotation assembly 11 are different, so that a linear velocity difference is generated between the synchronous belts 102 of the first anti-rotation assembly 10 and the second anti-rotation assembly 11, and in turn a rotational speed difference for driving the bottle cap 2 to rotate is formed.

[0052] In actual application, the bottle body 3 carries the bottle cap 2 which has been placed into the reverse rotation station. At this time, the reverse rotation mechanism 1 is started. The reverse rotation mechanism 1 comprises a common rotating motor 13, the output end of which is connected to and drives the first reverse rotation assembly 10 and the second reverse rotation assembly 11 through a transmission belt. In the plurality of transmission rollers 100 of each reverse rotation assembly, the transmission roller 100 directly connected to the output end of the rotating motor 13 (or connected through a transmission belt) is defined as the driving roller 105. The driving roller 105 of the first reverse rotation assembly 10 and the driving roller 105 of the second reverse rotation assembly 11 are coaxial. This means that they are mounted on the same rigid driving shaft and driven by the same rotating motor 13, and must realize synchronous, same direction and same angular velocity rotation. The diameters of the driving rollers 105 of the first reverse rotation assembly 10 and the second reverse rotation assembly 11 are intentionally designed to be different, and the lengths of the synchronous belts 102 of the first reverse rotation assembly 10 and the second reverse rotation assembly 11 are different (i.e. adapted to the diameters of the respective driving rollers 105). When the rotating motor 13 is started to drive the common shaft to rotate, the two driving rollers 105 with different diameters have the same angular velocity (rotations per minute), but since the circumferential linear velocity is equal to the angular velocity multiplied by the radius, the linear velocity of the outer edge of the driving roller 105 with a larger diameter is naturally greater than that of the driving roller 105 with a smaller diameter. The linear velocity is directly transmitted through the synchronous belt 102 sleeved on the outer edge of the roller, so that the running linear velocity of the synchronous belt 102 of the first reverse rotation assembly 10 and the running linear velocity of the synchronous belt 102 of the second reverse rotation assembly 11 have a preset, fixed difference at the starting point, i.e. a linear velocity difference. When the two synchronous belts 102 running at different linear velocities but having the same movement direction (due to the coaxial and same direction rotation) simultaneously press the two sides of the top surface of the bottle cap 2, the frictional force they exert on the bottle cap 2 generates a net torque driving the bottle cap 2 to rotate around its axis. The size and direction of the torque are determined by the preset linear velocity difference (in an ideal state, the greater the linear velocity of the synchronous belt 102, the greater the displacement of the bottle cap 2 in the linear velocity direction driven by the synchronous belt 102, and the linear velocity difference between the running linear velocity of the synchronous belt 102 of the first reverse rotation assembly 10 and the running linear velocity of the synchronous belt 102 of the second reverse rotation assembly 11 leads to a displacement difference in the displacement of the bottle cap 2 driven by the two, and the size of the displacement difference is proportional to the size of the torque), thereby stably and reliably driving the bottle cap 2 to rotate in the loosening direction and synchronously completing the pressing and alignment.

[0053] The application adopts a mechanical design of a single rotating motor 13 matched with a driving roller 105 of the same shaft but different diameters, and only uses the simplest mechanical components (motor, shaft, and rollers of different diameters) to realize the core function of the same direction differential speed. Since the speed difference is derived from the fixed mechanical size (the diameter ratio of the rollers), as long as the motor is running, the linear speed difference between the two counter-rotating assemblies is a constant value. This eliminates the complexity of possible fluctuations, delays, or feedback adjustments of electronic speed regulation, making the rotation driving of the bottle cap 2 stable and predictable, suitable for high-speed and continuous production rhythm. The two driving rollers 105 are coaxially arranged and synchronously rotated by the same motor, which ensures that the starting, stopping, and rotation phase of the driving actions on both sides are completely synchronized from the power source. This avoids the possible micro timing or response differences of double independent motor driving, ensures the instantaneous consistency of the actions applied to the two sides of the bottle cap 2, and prevents the bottle cap 2 from being momentarily stuck or tilted due to the asynchronous actions.

[0054] According to some embodiments of the application, as shown in Figures 7-8 The synchronous belt 102 abuts against the edge region where the top wall meets the side wall of the bottle cap 2, and the action line of the pressing force exerted by the synchronous belt 102 on the bottle cap 2 intersects with the central axis of the bottle cap 2.

[0055] In actual application, the working side of the synchronous belt 102 of the first counter-rotating assembly 10 and the second counter-rotating assembly 11 is precisely adjusted to a specific height. This height makes the synchronous belt 102 not press on the top surface of the bottle cap 2, but precisely press on the edge region where the top wall meets the side wall of the bottle cap 2. For most bottle caps 2, this is a fillet or edge line region that transitions from the top surface to the side surface. Since the contact point is located at the edge region of the bottle cap 2, the action line of the pressing force exerted by the synchronous belt 102 on the bottle cap 2 (i.e., the force line passing through the contact point and perpendicular to the contact surface of the synchronous belt 102) can naturally intersect with the central axis of the bottle cap 2. In this way, the bottle cap 2 is pressed at a height near the center of gravity of the bottle cap 2, and a clamping force is applied to the central axis of the bottle cap 2 from both sides. In this state, the two synchronous belts 102 rotate in the same direction and generate a speed difference. The frictional force they exert on the edge region of the bottle cap 2 is efficiently converted into a pure torque that drives the bottle cap 2 to rotate around its own central axis.

[0056] The synchronous belt 102 of the first and second counter-rotation assemblies 10 and 11 applies the pressing force near the center axis of the bottle cap 2, avoiding additional overturning moments caused by the pressing force deviating from the center. This ensures that the bottle cap 2 is stable in posture during the entire leveling process and does not experience new and additional tilting during pressing and rotation, making the leveling action accurate and reliable. The contact point is located at (or near) the maximum diameter of the bottle cap 2, and according to the principle of leverage, the force arm is the longest at this point. Therefore, the synchronous belt 102 only needs to apply a small frictional force to generate sufficient rotational torque to drive the bottle cap 2 to loosen. This reduces the requirements for the pressing force and friction coefficient of the synchronous belt 102, making the drive lighter and more efficient. If the synchronous belt 102 is pressed against the top surface of the bottle cap 2 near the center, a component that causes the bottle cap 2 to lift up may be generated during rotational driving. In the present embodiment, since the pressing force and the rotational driving force are both applied to the area away from the center, the force path passes through the center of gravity of the bottle cap 2, which suppresses the axial movement (creep) or radial jumping of the bottle cap 2 that may occur during the leveling process, making the process more stable. For bottle caps 2 with spherical or complex top surfaces, the central region of the top wall may not provide a stable contact surface. The edge region where the top wall transitions to the side wall is usually a relatively stable and reliable force point in terms of structure, making the cap leveling device provided by the present application also have excellent adaptability to such bottle caps 2.

[0057] In the implementation process, the mounting seat of the synchronous belt 102 and the transmission drum 100 can be designed as a structure that can be adjusted in angle, so that the contact angle of the synchronous belt 102 and the edge region of the bottle cap 2 can be accurately adjusted to adapt to the side surface of bottle caps 2 of different tapers or shapes, ensuring that the force always passes through the ideal path.

[0058] According to some embodiments of the present application, as shown in Figure 8 The outer side of the synchronous belt 102 forms a limiting groove 1020, and the shape of the limiting groove 1020 is adapted to the edge region of the bottle cap 2.

[0059] In actual application, the outer side (working side) of the synchronous belt 102 of the first and second counter-rotation assemblies 10 and 11 is not flat, but is processed or molded with specific limiting grooves 1020. The cross-sectional shape (such as V-shaped, U-shaped or circular arc-shaped) of the limiting grooves 1020 is highly adapted to the profile of the edge region (i.e. the transition region between the top wall and the side wall) of the bottle cap 2, forming a nested or embracing relationship. When the edge region of the bottle cap 2 enters and abuts against the limiting grooves 1020 of the synchronous belt 102, accurate positioning in three-dimensional space is achieved. The pressing force of the synchronous belt 102 applied to the bottle cap 2 is evenly distributed through the contact surface of the limiting grooves 1020, and the action line is naturally constrained to pass through the central axis of the bottle cap 2. Under the common embrace of the two limiting grooves 1020, the bottle cap 2 is stably centered. Subsequently, the two synchronous belts 102 rotate in the same direction under the drive and generate a speed difference. Since the bottle cap 2 is well constrained by the limiting grooves 1020, the contact area and friction between the synchronous belt 102 and the bottle cap 2 increase, and the rotational torque generated by the speed difference is extremely efficiently and without slip transmitted to the bottle cap 2, driving it to complete the precise loosening and leveling action.

[0060] The introduction of the limiting grooves 1020 upgrades the previous surface contact or line contact constraint to a profile-matched geometric constraint. Any radial excursion or circumferential slip that may occur during the leveling process of the bottle cap 2 is eliminated, ensuring the absolute accuracy and reliability of the leveling action. Since the limiting grooves 1020 increase the contact area and prevent slipping, the synchronous belt 102 can convert its speed difference into the rotation of the bottle cap 2 almost without loss. This makes it easy and stable for the cap pre-leveling device provided by the application to complete the loosening action even in the case of tight pre-engagement of the bottle cap 2 with the bottle mouth and large resistance, avoiding leveling failure caused by slipping. The limiting grooves 1020 adapted to the edge of the bottle cap 2 are a natural centering mechanism. Even if there is a slight initial eccentricity of the bottle cap 2 when it enters, it can be automatically guided to the center position during the process of entering the limiting grooves 1020, reducing the requirement for the positioning accuracy of the delivery.

[0061] According to some embodiments of the application, as shown in Figure 3 The counter-rotation mechanism 1 further includes a lifting member 103, and the transmission drum 100 is installed on the lifting member 103 and driven by the lifting member 103 to lift the transmission drum 100 and the synchronous belt 102 as a whole.

[0062] In actual application, in non-working state, the lifting member 103 is in the lifting state, driving all the transmission rollers 100 and the tensioned synchronous belt 102 on it to be in the high position as a whole. At this time, there is enough safety gap between the bottom of the synchronous belt 102 and the top of the bottle cap 2 on the conveying line, and the bottle cap 2 can pass freely without contacting the synchronous belt 102. Before the working state, the lifting member 103 drives the transmission roller 100 and the synchronous belt 102 to descend to the working position as a whole, so that the synchronous belt 102 can stably contact the bottle cap 2.

[0063] Through the lifting action of the lifting member 103, the leveling mechanism and the conveying flow are isolated. In the non-working period, the two are completely separated, eliminating any possible interference, collision or friction, and being suitable for high-speed, high-density or conveying line with unstable posture of the bottle body 3. The lifting stroke can be flexibly adjusted and programmed according to the height of different bottle caps 2. This makes the same leveling device easily adapt to various products from small medicine bottle caps 2 to large beverage bottle caps 2, greatly enhancing the flexibility of the production line.

[0064] According to some embodiments of the present application, as shown in Figure 9 The transmission roller 100 is rotatably arranged on the mounting bracket 104; among the plurality of transmission rollers 100, the transmission roller 100 which first contacts the bottle cap 2 when the bottle body 3 enters the cap screwing station is defined as the entrance roller 101; the entrance roller 101 is movably arranged on the mounting bracket 104 and is configured to displace relative to the mounting bracket 104 to avoid the bottle cap 2 when the extrusion force of the bottle cap 2 exceeds a threshold value.

[0065] In actual application, when the cap 2 is severely tilted (for example, the angle of tilt exceeds the normal range), the raised portion of the cap 2 will generate a much larger extrusion force than normal when it contacts the entry roller 101, which is directed obliquely upward. This extrusion force is transmitted to the entry roller 101 through the synchronous belt 102. When this force exceeds the preset threshold, the entry roller 101 is displaced, allowing the roller to retreat, usually upward and slightly backward, relative to the mounting bracket 104. This retreat action creates more space, allowing the protruding portion of the severely tilted cap 2 to pass smoothly, thereby avoiding the hard collision that can cause the cap 2 to fly off, the bottle to tip over, or the equipment to jam. Once the protruding portion of the cap 2 passes, the abnormal extrusion force acting on the entry roller 101 disappears, and under the action of the elastic or driving element, the entry roller 101 quickly returns to the original working position, and the subsequent synchronous belt 102 region can normally contact and compress the cap 2, continuing the leveling operation. When the high point of the excessively tilted cap 2 passes the position of the entry roller 101 after retreat, the entire top region of the cap 2 enters the leveling region formed by the synchronous belt 102. At this time, the synchronous belts 102 of the first and second counter-rotation assemblies 10 and 11 drive the cap 2 to rotate (unscrew) in the same direction with a speed difference. This rotating action, combined with the continuous compression force of the synchronous belt 102 on the top of the cap 2, begins to dynamically correct the tilt of the cap 2. During rotation, the cap 2 is no longer in poor pre-engagement with the threads of the bottle mouth, and under the pressure of the synchronous belt 102, it constantly seeks the correct position parallel to the end face of the bottle mouth. After a short period of rotation and leveling, the originally excessively tilted cap 2 is significantly corrected, and its attitude tends to be normal, with the end face being essentially parallel to the end face of the bottle mouth. At this time, this leveled cap 2 will only generate normal and stable contact pressure on the top of the subsequent transmission roller 100 during subsequent conveying, and will no longer generate excessive extrusion force.

[0066] The design of the entrance roller 101 that can move to avoid the excessively tilted bottle cap 2 enables the levelling device to safely and smoothly handle various abnormal state bottle caps 2, especially the problem bottle caps 2 that are severely tilted, minimizes the risk of production interruption, and ensures the continuous and stable operation of the entire production line. By actively avoiding the entrance roller 101 instead of hard collision, the huge stress caused by jamming is avoided, effectively protecting the bottle cap 2, the bottle body, and the transmission roller 100, the synchronous belt 102, and the driving mechanism of the levelling device itself, prolonging the service life of the equipment, and eliminating the secondary problems caused by the dumping of the bottle body 3. The entrance roller 101 changes from fixed to displaceable, which is equivalent to adding an intelligent and flexible buffer guide mechanism to the entrance of the bottle cap 2. It can not only allow abnormal bottle caps 2 to pass through, but also ensure that normal bottle caps 2 still receive the necessary initial contact and compression, achieving two goals at once. The avoidance mechanism of the entrance roller 101 allows abnormal bottle caps 2 to enter, the levelling function of the first and second anti-rotation assemblies 10 and 11 corrects the abnormal state of the bottle cap 2, and the corrected bottle cap 2 no longer triggers subsequent avoidance. This makes the device not only tolerate abnormalities, but also repair abnormalities, ultimately output a bottle cap 2 that meets the requirements, and ensures the final quality of the production process.

[0067] During implementation, a displacement sensor or a proximity switch can be provided on the entrance roller 101. When the avoidance action is detected, a signal can be sent to the control system to record this abnormal event. If abnormal events occur frequently within the same batch, the system can issue an alarm to indicate that there may be a problem in the capping process, achieving production line quality monitoring.

[0068] According to some embodiments of the present application, as shown in Figure 9 The rotating shaft of the entrance roller 101 is slidably provided in the guide groove 1040 of the mounting bracket 104 through the connecting piece 1010; the guide groove 1040 is provided with an elastic piece 1041, which provides the entrance roller 101 with a pre-tightening force for abutting against the bottle cap 2; when the extrusion force from the bottle cap 2 exceeds the threshold value, the rotating shaft of the entrance roller 101 compresses the elastic piece 1041 through the connecting piece 1010 and moves along the guide groove 1040 to avoid the bottle cap 2.

[0069] The elastic piece 1041 can be, but is not limited to, a cylindrical spiral compression spring, a polyurethane elastomer, or a butterfly spring.

[0070] In actual application, when the excessively tilted bottle cap 2 enters, the raised part thereof generates a pressing force far exceeding the threshold value to the inlet roller 101. The force is transmitted to the inlet roller 101 through the synchronous belt 102, and is converted into a compression force to the elastic member 1041 through the connecting member 1010. When the force exceeds the threshold value (i.e. the pre-tightening force of the elastic member 1041), the connecting member 1010 compresses the elastic member 1041, and moves along the track of the guide groove 1040. The movement drives the inlet roller 101 to generate a retreat displacement as a whole, and leaves a passing space for the protruding part of the abnormal bottle cap 2, thereby avoiding rigid collision. When the protruding part of the abnormal bottle cap 2 passes, the pressing force is instantaneously reduced. At this time, the compressed elastic member 1041 releases energy, and pushes the connecting member 1010 and the rotating shaft of the inlet roller 101 to slide back to the initial position along the guide groove 1040, and returns to the normal standby state, ready to welcome the next bottle cap 2.

[0071] The inlet roller 101 realizes passive retreat through the elastic member 1041, which is a pure mechanical and instantaneous response. The retreat is triggered immediately at the moment of collision, and the response speed is extremely fast, and the reliability is extremely high, which is suitable for high-speed and high-frequency production environment. In the embodiment, the guide and elastic return functions are integrated in the guide groove 1040 of the mounting bracket 104, and the structure is very compact. The whole retreat mechanism has good rigidity, stable action, and long service life. The elastic member 1041 provides a stable and quantifiable pre-tightening force for the inlet roller 101. By replacing springs with different stiffness or adjusting the pre-compression amount of the spring, the retreat force threshold value can be accurately set and adjusted, so as to adapt to bottle caps 2 with different weights and materials. The guide groove 1040 not only guides the retreat direction, but also ensures that the inlet roller 101 can return to the initial position along the accurate path after retreat, guarantees the tension degree of the synchronous belt 102 and the repeat accuracy of the working position, and avoids the decline of the device performance caused by the retreat action.

[0072] According to some embodiments of the present application, as shown in Figures 5-6 and Figure 10 , the mounting bracket 104 is further provided with a position-adjustable tensioning wheel 12; the wheel shaft installation position of the tensioning wheel 12 can be adjusted in a direction perpendicular to the axis of the driving roller 100, and the synchronous belt 102 is tensioned or loosened by moving the tensioning wheel 12.

[0073] The number of the tensioning wheels 12 on the mounting bracket 104 is at least two, and the two tensioning wheels 12 are coaxially arranged, one corresponding to the first counter-rotation assembly 10 and the other corresponding to the second counter-rotation assembly 11, and the diameter of the tensioning wheel 12 corresponds to the diameter of the driving roller 105 of the corresponding counter-rotation assembly.

[0074] In actual application, an adjustable position tension pulley 12 is arranged on the mounting bracket 104. The tension pulley 12 itself is a freely rotating roller, and its core feature is that the installation position of its axle is adjustable. When the synchronous belt 102 needs to be tensioned, the operator moves the tension pulley 12 in a direction perpendicular to the axis of the transmission roller 100 (usually the normal direction approaching the synchronous belt 102). The displacement of the tension pulley 12 changes the total length and wrap angle of the synchronous belt 102 transmission loop, thereby tensioning the slack synchronous belt 102. Conversely, when the synchronous belt 102 needs to be replaced or loosened, the tension pulley 12 is moved in the opposite direction to loosen the synchronous belt 102. Once the synchronous belt 102 tension is adjusted to the optimal range through this mechanism, the two counter-rotation assemblies can be put into operation.

[0075] A moderate and stable tension is the basis for the synchronous belt 102 to reliably transmit power and prevent slipping or tooth skipping. The position-adjustable tension pulley 12 can accurately adjust the synchronous belt 102 tension to the optimal range, thereby ensuring the torque stability and speed accuracy of the first counter-rotation assembly 10 and the second counter-rotation assembly 11 driving the bottle cap 2 to rotate. The synchronous belt 102 will naturally wear and slightly plastically elongate after long-term use, causing the tension to decrease. The design allows the original tension to be quickly restored without replacing the belt length by adjusting the position of the tension pulley 12, compensating for wear and elongation, extending the service life of the synchronous belt 102 and the entire transmission system, and reducing maintenance frequency and cost.

[0076] According to some embodiments of the present application, as shown in Figures 10-11 According to some embodiments of the present application, as shown in

[0077] The liftable stopper 41 mentioned in the present application can be lifted to adjust the gap size between the stopper 41 and the bottom wall of the slide 40 during equipment installation, debugging, or replacement of bottle cap 2 specifications. By lifting the stopper 41, a gap that can only accommodate a single bottle cap 2 can be set. Once adjusted and locked, the stopper 41 remains stationary and does not move during normal continuous production use.

[0078] In actual application, the bottle cap 2 sliding out of the chute 40 is blocked by the first section 410 of the stationary block 41. At this time, the lowermost bottle cap 2 is just stuck in the gap formed by the bottom wall of the chute 40 and the lower edge of the first section 410 of the block 41. This precisely set gap ensures that only one bottle cap 2 is in the preparatory release position each time. When the conveying mechanism 5 conveys the bottle body 3 to just below the gap, this prepared bottle cap 2 falls through the gap under the action of gravity and is placed onto the mouth of the bottle body 3. After the bottle cap 2 is placed, the bottle body 3 continues to move forward under the drive of the conveying mechanism 5. At this time, the stationary block 41 becomes a fixed guide surface on the moving path of the bottle cap 2. As the bottle body 3 advances, the top surface of the bottle cap 2 will successively contact and slide with the first section 410 and the second section 411 of the block 41. First, the first section 410 with a larger inclination angle is contacted, which generates a stronger transverse correction force on the bottle cap 2 and can quickly correct the larger initial inclination. Then, the second section 411 with a smaller inclination angle is contacted, which provides a more gentle guide and fine-tunes and stabilizes the posture of the bottle cap 2 to prevent it from rebounding. Through the sliding contact with the stationary block 41, the posture of the bottle cap 2 is significantly improved before it enters the reverse rotation station from the capping mechanism 4, and the inclination angle is reduced.

[0079] The cap pre-flattening device provided by the application automatically completes the preliminary adjustment of the posture of the bottle cap 2 during the conveying process of the bottle cap 2 by using the kinetic energy of the self-conveying bottle body 3 through a stationary block 41 with a specific profile. This scheme does not require additional driving or control actions, but can correct the possible severe inclination of the bottle cap 2 to a smaller range, reduces the working load and flattening difficulty of the subsequent reverse rotation mechanism 1, and improves the robustness and success rate of the overall process.

[0080] Although the application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the application, and equivalent components can be substituted therefor. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A pre-capping levelling device for spin caps, characterised in that, The device comprises: a conveying mechanism for conveying the bottle along a predetermined path; a cap placing mechanism arranged along the conveying path for placing the cap on the mouth of the bottle; a counter-rotating mechanism arranged along the conveying path downstream of the cap placing mechanism, comprising a first counter-rotating component and a second counter-rotating component arranged symmetrically with respect to the axis of the bottle, both configured to press the top surface of the cap; wherein the first counter-rotating component and the second counter-rotating component are driven to rotate in the same direction, and have a rotational speed difference therebetween to jointly drive the cap to rotate about its axis; the line speed direction of the contact part between the first counter-rotating component and the second counter-rotating component and the cap is the same as the direction in which the conveying mechanism conveys the bottle; the counter-rotating mechanism is configured to drive the cap to rotate in a loosening direction and press the cap towards the mouth of the bottle at the same time, so that the end surface of the cap is aligned with the end surface of the mouth of the bottle.

2. The cap aligning device according to claim 1, wherein: the second counter-rotating component has the same structure as the first counter-rotating component; the first counter-rotating component comprises: a plurality of transmission rollers; a synchronous belt wrapped around and tensioned on the outside of the plurality of transmission rollers; the synchronous belt is used to abut against the cap and is driven to rotate by the transmission rollers.

3. The cap aligning device according to claim 2, wherein: the counter-rotating mechanism further comprises a rotating motor; the first counter-rotating component and the second counter-rotating component are both connected to the output end of the rotating motor; among the plurality of transmission rollers, the transmission roller directly connected to the output end of the rotating motor is defined as a driving roller; the driving roller of the first counter-rotating component and the driving roller of the second counter-rotating component are coaxially arranged and synchronously rotate under the drive of the rotating motor; the diameter of the driving roller of the first counter-rotating component and the diameter of the driving roller of the second counter-rotating component are different, so that a line speed difference is generated between the synchronous belt of the first counter-rotating component and the synchronous belt of the second counter-rotating component, and a rotational speed difference for driving the cap to rotate is formed.

4. The cap aligning device according to claim 3, wherein: the synchronous belt abuts against the edge region where the top wall and the side wall of the cap meet; the action line of the pressing force exerted by the synchronous belt on the cap intersects with the central axis of the cap.

5. The cap aligning device according to claim 4, wherein: the outside of the synchronous belt forms a limiting groove, and the shape of the limiting groove is matched with the edge region of the cap.

6. The cap aligning device according to claim 2, wherein: the counter-rotating mechanism further comprises a lifting member; the transmission rollers are mounted on the lifting member, and the transmission rollers and the synchronous belt are lifted as a whole by the lifting member.

7. The cap aligning device according to claim 2, wherein: the transmission rollers are rotatably arranged on a mounting bracket. Of the plurality of drive rollers, the drive roller that first contacts the cap when the bottle enters the capping station is defined as the inlet roller; The inlet roller is movably mounted on the mounting bracket and configured to displace relative to the mounting bracket when the squeezing force from the bottle cap exceeds a threshold, so as to avoid the bottle cap.

8. A pre-capping leveling device according to claim 7, characterized in that, The shaft of the inlet roller is slidably mounted in the guide groove of the mounting bracket via a connector; The guide groove is provided with an elastic element, which provides a pre-tightening force for the inlet roller to abut against the bottle cap; When the squeezing force from the bottle cap exceeds a threshold, the shaft of the inlet roller compresses the elastic element through the connector and moves along the guide groove to avoid the bottle cap.

9. A pre-capping leveling device according to claim 7, characterized in that, The mounting bracket is also equipped with an adjustable tension wheel; The mounting position of the tensioning wheel axle can be adjusted in a direction perpendicular to the axis of the drive drum, and the timing belt can be tensioned or loosened by moving the tensioning wheel.

10. A pre-capping leveling device according to claim 1, characterized in that, The upper cover mechanism includes: A slide is used to guide the bottle cap to slide down to its end and place it onto the bottle opening of the bottle body; A liftable stop is provided on the exit side of the slide rail; The block includes a first section and a second section connected along its length, wherein the tilt angle of the first section relative to the bottle conveying direction is greater than the tilt angle of the second section. A portion of the first section is directly opposite the bottom wall of the slide, with a gap between them for a single bottle cap to pass through; When the bottle cap is placed on the bottle mouth and transported with the bottle body, its top surface will successively contact the first and second sections of the stop and be pushed to initially adjust its posture.

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