A device for dispensing glue on the end face of a granular heating cigarette paper tube

Abstract

The application provides a granular heating cigarette paper tube end face quantitative point glue device, comprising: a drum, using a smoke slot to receive a cigarette paper tube, a glue pool is arranged on the position above each smoke slot, and a ring wheel body is arranged in the glue pool, and a point glue head assembly is arranged in the glue pool; the filter end of the cigarette paper tube is exposed upwards and is always located below a moving glue stick in a group of point glue head assemblies, and the bottom end surface of the moving glue stick is arranged in correspondence with the filter end; a cam, a circular ring groove is formed on the bottom end surface, the circular ring groove is concave upwards and coaxial with the drum, and the top of the moving glue stick is in sliding contact with the circular ring groove, so that the moving glue stick rotates synchronously with the drum and repeatedly switches between a glue adding position, a "0" position, a point glue position and a transition position, and the device forms quantitative point glue, automatic cleaning after point glue and automatic glue adding after cleaning. The application can realize the functions of circular glue shape, adjustable point glue amount, automatic sealing after point glue, quantitative point glue and the like, and improves product quality and production efficiency.

Description

Technical Field

[0001] This invention relates to the field of cigarette production technology, and more specifically to a device for quantitatively dispensing adhesive onto the end face of a granular heated cigarette paper tube. Background Technology

[0002] Heated cigarettes, due to their low harm and risk, and their smoking experience being similar to traditional cigarettes, have rapidly become the most promising new cigarette product and a hot area for future development in the tobacco industry. Among them, electrically heated cigarettes, with their advantages of controllable heating temperature, flexible heating methods, and convenient and fashionable use, represent an important development direction for heated cigarettes both domestically and internationally.

[0003] Currently, based on the form of the smoke-releasing material, heated cigarettes can be divided into ordered sheet heated cigarettes, disordered sheet heated cigarettes, and granular heated cigarettes. Granular heated cigarettes are a type of heated cigarette product that uses granular tobacco material as the smoke-releasing material. For example, patents CN 109527638A, CN 109527639A, and CN 109512031A disclose the structure of granular heated cigarette sticks. Furthermore, patents CN 108903065A, CN 109292115A, and CN201910809788.3 disclose equipment for forming granular heated cigarette sticks. Additionally, patent CN201910808764.6 discloses a continuous adhesive coating device for the end face of the paper tube of granular heated cigarettes. However, this adhesive coating device uses a transfer coating method, which has drawbacks such as difficulty in controlling the amount of adhesive applied, easy formation of an adhesive film, and granule spillage due to the easy swaying of the cigarette stick. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a rationally designed device for quantitative dispensing of adhesive onto the end face of a granular heated cigarette tube. This device aims to achieve functions such as circular adhesive dispensing shape, adjustable dispensing volume, automatic sealing after dispensing, and quantitative dispensing, thereby improving product quality and production efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A device for quantitative dispensing of adhesive onto the end face of a granular heated cigarette tube includes: The drum can rotate around its central axis. Multiple flue grooves are formed on the outer circumference of the drum, which are evenly spaced along the circumference. The cigarette paper tube can be placed vertically in the flue grooves and rotate synchronously with the drum. It can also be separated from the flue grooves. A glue pool is formed around the drum body above each flue groove. Multiple glue dispensing head assemblies are arranged in the glue pools, directly above each flue groove. The filter end of the cigarette paper tube is exposed upwards and is always directly below the glue transfer rod in the corresponding glue dispensing head assembly. The bottom end of the glue transfer rod is sized according to the filter end. The cam is suspended above the drum with a vertical gap between it and is driven by a lifting mechanism to be raised and lowered. The bottom surface has a ring-shaped groove that is concave upward and coaxial with the drum. The ring-shaped groove is divided into a glue-adding section, a "0" position section, a glue-dispensing section, and a transition section according to different groove depths along the rotation direction of the drum. The glue tank is equipped with a glue injection port and an internal cavity for holding glue. Multiple vertically connected and compatible mounting holes are opened at the bottom end of the tank according to the position and shape of each glue dispensing head assembly. The glue dispensing head assembly is fitted into the mounting holes and rotates synchronously with the drum. The dispensing head assembly includes a flow guide sleeve, a guide sleeve, and a dispensing rod, coaxially mounted from the outside to the inside, and also includes a return spring. The flow guide sleeve is fitted into the mounting channel. The flow guide sleeve is divided into an upper region and a lower region by the guide sleeve. The bottom end has a dispensing channel with dimensions adapted to the bottom end of the dispensing rod. The bottom end of the dispensing rod, with dimensions adapted to the dispensing channel, is vertically and slidably inserted into the guide sleeve, penetrating the flow guide sleeve and forming a support for the upper region together with the guide sleeve. The sealing mechanism consists of an outer peripheral wall of the stick and an inner peripheral wall of the guide sleeve forming an annular glue storage area in the lower region. The glue liquid in the glue tank flows into this annular storage area through multiple seepage holes on the guide sleeve's peripheral wall. The top of the glue transfer stick protrudes above the glue tank and is always slidably fitted into the annular groove of the cam. It rotates synchronously with the drum, repeatedly sliding and contacting the glue application section, the "0" position section, the glue dispensing section, and the transition section of the annular groove. Guided by the guide sleeve, it forms a vertical line within the guide sleeve. The displacements correspond to the glue-adding position, the "0" position, the dispensing position, and the transition position of the glue transfer rod, respectively. When the glue transfer rod is in the glue-adding position, the bottom end face of the rod extends directly below the glue outlet channel, with a vertical distance 'a' between it and the upper edge of the glue outlet channel. Moving down a distance 'a' from the glue-adding position to the "0" position, the bottom end face of the rod is flush with and in contact with the upper edge of the glue outlet channel, forming a blockage of the glue outlet channel. Moving down a distance 'b' from the "0" position to the dispensing position, the bottom end of the rod passes through the glue outlet channel, and the bottom end face... The adhesive rod is exposed and contacts the filter end of the cigarette paper tube directly below, forming an adhesive application on the end face of the filter end of the cigarette paper tube. From the adhesive application position, it gradually moves upward and resets to the adhesive application position through the transition position by the elastic force of the reset spring. The upward movement is the distance c. When in the transition position, the part of the adhesive rod exposed below the adhesive outlet can contact the scraper. The scraper is a fixed component independent of the drum. The plate surface is horizontal and extends between the guide sleeve and the filter end of the cigarette paper tube. The plate segment that contacts the adhesive rod is made of flexible material.

[0006] The structural features of this invention also lie in: The spacing a is 0.3 mm, the spacing b is 4 mm, and the spacing c is the sum of spacing a and spacing b, which is 4.3 mm.

[0007] The cam is driven by a lifting mechanism to descend a distance d from the initial position to the emergency stop position, or to move up a distance d from the emergency stop position back to the initial position. The rubber transfer rod descends synchronously with the cam and can be restored to its original position when the cam moves up by a reset spring.

[0008] In the dispensing head assembly: Multiple seepage holes are distributed circumferentially on the peripheral wall of the guide sleeve. Each seepage hole consists of a seepage groove and a seepage port. The seepage groove is a vertical groove opened from the top of the guide sleeve downward along the axial direction of the sleeve, and the height area occupied is set according to the height range of the upper region. The seepage port is a through hole opened radially along the bottom end of the seepage groove, and its height position is located at the top of the lower region, which is used to communicate between the seepage groove and the lower region. The glue liquid in the glue tank seeps into the annular glue storage area of ​​the guide sleeve from the seepage groove through the seepage holes. When the glue transfer rod is in the glue adding position, it seeps and adheres to the inner peripheral wall of the glue outlet channel.

[0009] In the dispensing head assembly: The top of the dispensing rod is hemispherical, and its arc surface slides in the annular groove of the cam. The return spring is sleeved on the rod between the lower end of the hemispherical top and the top of the guide sleeve. The return spring is compressed when the dispensing rod is in the "0" position, the dispensing position, or the transition position.

[0010] The cam is suspended at the top by four sets of lifting mechanisms mounted on the upright frame. The four sets of lifting mechanisms are centrally symmetrically distributed around the central axis of the cam. The lifting mechanism includes a cylinder support roller, a lifting cylinder, and a lifting arm. The cylinder support roller has a "b"-shaped structure. The bottom end of the roller surface of the short columnar roller body contacts the upright frame, and it is rotatably mounted on the upright frame around the pivot at the bottom end. The top extends outward along the tangential direction to form a horizontal support plate. The lifting cylinder is hinged to the free end of the horizontal support plate. The cylinder rod extends downward facing the cam. A lifting spring is sleeved on the cylinder rod, and the lower end is hinged to the top of the cam. The two hinge axes are parallel to the central axis of the pivot. The lifting spring is compressed when the cylinder rod extends downward.

[0011] Multiple sets of evenly arranged buffer components are provided between the bottom of the cam and the top of the drum. Each buffer component includes a buffer post, a buffer sleeve, and a buffer spring. The buffer post is vertically installed in the rubber pool, protruding between the drum and the cam, and the buffer spring is sleeved on it. The buffer sleeve is located at the bottom of the cam and is vertically movable on the exposed section of the buffer post. The buffer spring deforms vertically, with its bottom end fixed and its top end connected to the buffer sleeve.

[0012] The tobacco trough is a semi-cylindrical through-slot that is concave radially inward along the drum and vertically through. The trough wall is provided with air suction holes that connect to the external negative pressure system. The tobacco paper tube is placed vertically in the tobacco trough by relying on the negative pressure to adsorb the phase.

[0013] The scraper blade, whose section contacts the glue transfer rod, is arc-shaped and coaxial with the drum, and is made of EVA sponge.

[0014] The top of the glue tank is open, serving as the glue injection port.

[0015] Compared with existing technologies, the beneficial effects of this invention are reflected in: First, it has high precision in controlling the dispensing volume, enabling quantitative dispensing. Breaking away from the conventional structure of the drum, the existing structure is modified by placing a glue pool with a dispensing head assembly above the cigarette paper tube. The dispensing head assembly, placed within the glue pool, rotates synchronously with the cigarette paper tube along with the drum. Furthermore, a cam is added. The annular groove on the cam creates a circumferential sliding relationship between the cam and the glue-moving rod of the dispensing head assembly. The sequential contact of the glue-adding section, the "0" position section, the dispensing section, and the transition section with the glue-moving rod, with varying groove depths, causes a vertical relative displacement of the glue-moving rod relative to the cigarette paper tube. This repeatedly moves the glue-moving rod between the glue-adding position, the "0" position, and the dispensing position. The sequential switching between the glue position and the transition position involves the glue outlet of the glue dispensing head assembly's guide sleeve being filled with glue at the glue filling position and blocked from the annular glue storage area at the "0" position. During the transition from the "0" position to the glue dispensing position, the glue adhering to the inner wall of the glue outlet comes into contact with the downward-moving glue transfer rod, so that the outer edge of the bottom end of the glue transfer rod reaching the glue dispensing position carries a ring of glue, which is transferred onto the round end face of the cigarette paper tube. Since the glue transfer rod is in the glue filling position for a fixed duration and the depth of the glue outlet is fixed, the amount of glue carried by the bottom end of the glue transfer rod is stable each time it moves to the glue dispensing position, resulting in high precision in glue dispensing control and achieving quantitative glue dispensing. Secondly, it can achieve ring-shaped glue dispensing, which is better adapted to the round end face of the cigarette paper tube; Each time the glue dispensing position is reached, the glue transfer rod carries a ring of glue at the outer edge of its bottom end through contact with the inner wall of the glue dispensing channel, making the glue print on the cigarette paper tube filter end ring-shaped. Furthermore, since the bottom end of the glue transfer rod is adapted to the end face of the cigarette paper tube filter end, it can better adapt to the end face of the cigarette paper tube for glue dispensing. Third, it can automatically clean and close the dispensing port after dispensing, preventing product contamination due to glue leakage; During the process of switching the glue transfer rod from the dispensing position to the glue application position, the glue transfer rod will pass through a transition position. At this time, by using an external fixed scraper, the scraper contacts the body of the glue transfer rod exposed between the glue outlet and the cigarette paper tube, forming a scraping effect on the remaining glue on the rod body, which achieves the effect of automatic cleaning of the glue transfer rod, avoiding contamination of the cigarette paper tube due to glue leakage, and providing reliable assurance for production quality. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention without showing the cam; Figure 3 This is a schematic diagram of the cam structure; Figure 4 This is a three-dimensional structural diagram of the dispensing head assembly; Figure 5 This is a cross-sectional view of the dispensing head assembly; Figure 6 This is a schematic diagram of the scraper blade structure; Figure 7 This is a cross-sectional view of the present invention with the glue transfer rod positioned at the dispensing position and the glue application position, respectively. Figure 8 This is a cross-sectional view of the present invention with the glue transfer rod positioned at the dispensing position and the "0" position, respectively.

[0017] In the picture: 1 cigarette paper tube; 2 drums; 21 smoke trays; 3. Adhesive pool; 31. Installation channel; 4. Glue head assembly; 41. Flow guide sleeve; 42. Guide sleeve; 43. Glue transfer rod; 44. Return spring; 45. Seepage groove; 46. Seepage port; 47. Annular glue storage area; 48. Glue outlet channel; 5. Glue scraper; 51. Sponge board segment; 6. Cam; 61. Circular groove; 611. Adhesive application section; 612. "0" position section; 613. Dispensing section; 614. Transition section; 62. Lifting mechanism; 621. Cylinder support roller; 622. Lifting cylinder; 623. Lifting arm; 624. Lifting spring; 625. Buffer column; 626. Buffer sleeve; 627. Buffer spring; 628. Stand. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Please refer to Figures 1 to 8 The device for quantitative dispensing of adhesive on the end face of the granular heated cigarette tube in this embodiment includes: The drum 2 can rotate around the central axis. Multiple tobacco grooves 21 are formed on the outer circumference, which are evenly distributed along the circumference. The cigarette paper tube 1 can be placed vertically in the tobacco groove 21 and rotate synchronously with the drum 2. It can also be separated from the tobacco groove 21. On the drum 2, a glue pool 3 is provided around the drum body at a position above each tobacco groove 21. In the glue pool 3, multiple sets of glue dispensing head assemblies 4 are correspondingly arranged directly above each tobacco groove 21. The filter end of the cigarette paper tube 1 is exposed upward and is always directly below the glue transfer rod 43 in the corresponding set of glue dispensing head assemblies 4. The bottom end face of the glue transfer rod 43 is set according to the filter end. Cam 6 is suspended above drum 2 with a vertical gap between them. It can be raised and lowered by lifting mechanism 62. The bottom end face forms a ring-shaped groove 61 that is concave upward and coaxial with drum 2. The ring-shaped groove 61 is divided into glue application section 611, "0" position section 612, glue dispensing section 613, and transition section 614 according to different groove depths along the rotation direction of drum 2. The glue tank 3 is equipped with a glue injection port and a cavity inside the tank for holding glue. Multiple vertical through-holes 31 are opened at the bottom end of the tank body according to the position and shape of each glue dispensing head assembly 4. The glue dispensing head assembly 4 is fitted in the installation hole 31 and rotates synchronously with the drum 2. The dispensing head assembly 4 includes a flow guide sleeve 41, a guide sleeve 42, and a dispensing rod 43, which are coaxially mounted from the outside to the inside. It also includes a return spring 44. The flow guide sleeve 41 is fitted into the mounting channel 31. The flow guide sleeve 41 is divided into an upper region and a lower region by the guide sleeve 42. The bottom end has a dispensing channel 48 whose dimensions are adapted to the bottom end of the dispensing rod 43. The bottom end of the dispensing rod 43, whose dimensions are adapted to the dispensing channel 48, is vertically and slidably inserted into the guide sleeve 42, penetrating the flow guide sleeve 41, and together with the guide sleeve 42, forming a support. The upper region is sealed off, and the outer peripheral wall of the rod and the inner peripheral wall of the guide sleeve 41 form an annular glue storage area 47 in the lower region. The glue liquid in the glue pool 3 can flow into the annular glue storage area 47 through the multiple seepage holes on the peripheral wall of the guide sleeve 41. The top of the glue transfer rod 43 protrudes above the glue pool 3 and is always slidably engaged in the annular groove 61 of the cam 6. It rotates synchronously with the drum 2 and repeatedly slides and contacts the glue application section 611, the "0" position section 612, the glue dispensing section 613, and the transition section 614 of the annular groove 61 in sequence, and is guided by the guide sleeve 42. The vertical displacement formed in the guide sleeve 41 corresponds to the glue-adding position, the "0" position, the glue-dispensing position, and the transition position of the glue-transferring rod 43, respectively. When the glue-adding position is reached, the bottom end face of the rod extends directly below the glue outlet channel 48, with a vertical distance a between it and the upper edge of the glue outlet channel 48. Moving down a distance a from the glue-adding position to the "0" position, the bottom end face of the rod is flush with and in contact with the upper edge of the glue outlet channel 48, forming a blockage of the glue outlet channel 48. Moving down a distance b from the "0" position to the glue-dispensing position, the bottom end of the rod passes through the glue outlet. The bottom end of the channel 48 is exposed and contacts the filter end of the cigarette paper tube 1 directly below, forming an adhesive application on the filter end face of the cigarette paper tube 1. From the adhesive application position, the return spring 44 gradually moves upward and resets to the adhesive application position through the transition position. The upward movement is the distance c. When in the transition position, the part of the adhesive transfer rod 43 exposed below the adhesive outlet channel 48 can contact the scraper plate 5. The scraper plate 5 is a fixed component independent of the drum 2. The plate surface is horizontal and extends between the guide sleeve 41 and the filter end of the cigarette paper tube 1. The plate segment used to contact the adhesive transfer rod 43 is made of flexible material.

[0020] In specific implementation, the corresponding structural configuration of the device also includes: Taking the working speed of drum 2 as 350 pieces / minute as an example, the spacing a is 0.3mm, the spacing b is 4mm, and the spacing c is the sum of spacing a and spacing b, which is 4.3mm.

[0021] The cam 6, driven by the lifting mechanism 62, can descend a distance d from its initial position to the emergency stop position, or rise a distance d from the emergency stop position back to its initial position. The glue-moving rod 43 descends synchronously with the cam 6. After descending, the vertical distance between it and the top opening of the glue outlet channel 48 is 0mm~4.3mm, and it can return to its original position when the cam 6 moves upward via the return spring 44. The distance d is 0.3mm.

[0022] In dispensing head assembly 4: Multiple seepage holes are distributed circumferentially on the periphery of the guide sleeve 41. The seepage holes consist of seepage grooves 45 and seepage ports 46. The seepage grooves 45 are vertical grooves opened from the top of the guide sleeve 41 downward along the axial direction. The height area occupied is set according to the height range of the upper area. The top of the groove is exposed in the glue tank 3 and is connected. The seepage port 46 is a through hole opened at the bottom of the seepage groove 45 along the radial direction of the guide sleeve 41. The height position is located at the top of the lower area and is used to connect the seepage groove 45 and the lower area. The glue liquid in the glue tank 3 seeps from the seepage groove 45 through the seepage holes into the annular glue storage area 47 of the guide sleeve 41. When the glue transfer rod 43 is in the glue adding position, it seeps and hangs on the inner peripheral wall of the glue outlet channel.

[0023] In dispensing head assembly 4: The top of the dispensing rod 43 is hemispherical, and its arc surface slides in the annular groove 61 of the cam 6. A return spring 44 is sleeved on the rod body between the lower end of the hemispherical top and the top of the guide sleeve 41. The return spring 44 is compressed when the dispensing rod 43 is in the "0" position, the dispensing position, or the transition position.

[0024] The cam 6 is suspended at the top by four sets of lifting mechanisms 62 mounted on the support frame 628. The four sets of lifting mechanisms 62 are centrally symmetrically distributed around the central axis of the cam 6. As an optional solution in this embodiment, the structure of the lifting mechanism 62 may include a cylinder support roller 621, a lifting cylinder 622, and a lifting arm 623. The cylinder support roller 621 has a "b"-shaped structure. The bottom end of the roller surface of the short columnar roller body contacts the support frame 628, and it is rotatably mounted on the support frame 628 around the pivot at the bottom end. The top extends outward along the tangential direction to form a horizontal support plate. The lifting cylinder 622 is hinged to the free end of the horizontal support plate. The cylinder rod extends downwards facing the cam 6. A lifting spring 624 is sleeved on the cylinder rod, and the lower end is hinged to the top of the cam 6. The two hinge axes are parallel to the central axis of the pivot. The lifting spring 624 is compressed when the cylinder rod extends downwards. The lifting mechanism 62 is detachable from the cam 6 and from the upright 628, and can be assembled by bolt connection.

[0025] Multiple sets of evenly arranged buffer components are provided between the bottom of the cam 6 and the top of the drum 2 for buffering when the cam 6 descends and assisting when it rises. The buffer components include a buffer post 625, a buffer sleeve 626, and a buffer spring 627. The buffer post 625 is vertically installed in the rubber pool 3, protruding between the drum 2 and the cam 6. The buffer spring 627 is sleeved on the buffer post 627. The buffer sleeve 626 is located at the bottom of the cam 6 and is vertically and movably sleeved on the exposed section of the buffer post 625. The buffer spring 627 deforms vertically, with its bottom end fixed and its top end connected to the buffer sleeve 626.

[0026] The tobacco trough 21 is a semi-cylindrical through-slot that is radially concave and vertically penetrating along the drum 2. The trough wall is provided with air suction holes that connect to the external negative pressure system. The tobacco paper tube 1 is placed vertically in the tobacco trough 21 in accordance with the negative pressure adsorption phase.

[0027] The scraper 5 is an arc-shaped section that contacts the glue transfer rod 43 and is coaxial with the drum 2. It is a sponge section 51 made of EVA sponge material.

[0028] The top of the glue tank 3 is open, serving as the glue injection port. The glue supply method can be automatic or manual; this embodiment uses manual glue supply.

[0029] The functions of the main parts of this device are as follows: First, the drum 2 is used to make the cigarette paper tube 1 move in a circular motion; Second, the glue pool 3 is used to provide glue liquid for the dispensing head assembly 4 to the end face of the filter tip of the cigarette paper tube 1. Thirdly, the glue dispensing head assembly 4 is configured for each cigarette paper tube 1 on the drum 2. It rotates synchronously with the cigarette paper tube 1. The glue transfer rod 43 of this glue dispensing head assembly 4 always remains relatively stationary with the cigarette paper tube 1 in the circumferential direction. It only generates relative displacement with the cigarette paper tube 1 in the direction of the central axis of the cigarette paper tube 1 (i.e., vertical). Through the relative displacement of the glue transfer rod 43, it achieves contact and separation with the end face of the filter end of the cigarette paper tube 1. On this basis, through the structure of the flow guide sleeve 41 of the glue dispensing head assembly 4, the glue liquid in the glue pool 3 seeps into the lower part of the sleeve and the glue outlet hole 48 at the bottom of the sleeve, so that the glue liquid is attached to the inner wall of the glue outlet hole 48. Through contact with the vertically displaced glue transfer rod 43, the outer edge of the bottom end of the glue transfer rod 43 is covered with a ring of glue liquid, which completes the quantitative glue dispensing to the end face of the filter end of the cigarette paper tube 1 directly below, and achieves the glue outlet shape as a ring. Fourth, the cam 6, independent of the drum 2, remains stationary when the drum 2 rotates. It is used to cause the glue transfer rod 43 to generate relative displacement between itself and the cigarette paper tube 1. Through the annular groove 61, the glue transfer rod 43 repeatedly switches between the glue application position, the "0" position, the glue dispensing position, and the transition position. This causes the vertical distance between the glue transfer rod 43 of the glue dispensing head assembly 4 and the filter end of the cigarette paper tube 1 to change regularly. The height position relative to the glue outlet channel 48 also changes regularly. This achieves quantitative glue dispensing and automatic sealing of the glue outlet channel 48 after glue dispensing. In addition, the function of the cam 6 is that when the machine stops for any reason or glue dispensing is not needed, the lifting mechanism 62 drives the cam 6 to descend, which causes the glue transfer rod 43 to move down accordingly. The glue transfer rod 43 is used to achieve emergency sealing of the glue outlet channel 48.

[0030] Furthermore, the amount of glue dispensed can be adjusted by adjusting the vertical distance between the bottom of the glue rod 43 and the upper edge of the glue outlet 48 when the glue is in the glue dispensing position. This vertical distance, also known as the distance a, can be adjusted by adjusting the height position of the cam 6.

[0031] The following is a detailed explanation of the working principle of this device as the drum 2 rotates one revolution: Initially, the top of the glue transfer rod 43 fits into the glue-adding section 611 of the annular groove 61 of the cam 6, and is located in the glue-adding position. At this time, there is still a gap between the bottom end and the upper edge of the glue outlet 48 below. This gap a is 0.3mm. The glue in the glue pool 3 seeps from the seepage groove 45 of the seepage hole through the seepage port 46 to the annular glue storage area 47 of the guide sleeve 41. It flows down along the inner wall of the glue outlet 48 from the gap between the glue transfer rod 43 and the top opening of the glue outlet 48, and hangs on the inner wall of the glue outlet 48. As the drum 2 continues to rotate, the top of the glue transfer rod 43 slides along the annular groove 61 to fit into the "0" position segment 612 and is located at the "0" position. At this time, the bottom of the glue transfer rod 43 just reaches the top opening of the glue outlet channel 48, so that the annular glue storage area 47 is not connected to the glue outlet channel 48, thus avoiding excessive glue liquid adhering in the glue outlet channel 48 and causing overflow. Afterwards, the top of the glue transfer rod 43 slides along the annular groove 61 to fit into the glue dispensing section 613. The glue transfer rod 43 gradually moves down along the glue outlet channel 48 by 4mm to reach the glue dispensing position. During the process, the glue transfer rod 43 contacts the inner wall of the glue outlet channel 48. The bottom edge of the rod carries a ring of glue and contacts the end face of the cigarette paper tube 1 filter tip directly below. The ring of glue is transferred onto the filter tip of the cigarette paper tube 1, achieving quantitative glue dispensing and the glue dispensing shape is annular. After the glue dispensing is completed, the top of the glue transfer rod 43 slides along the annular groove 61 into the transition section 614. The glue transfer rod 43 gradually moves upward along the glue outlet channel 48 by 4.3mm, eventually reaching the glue application position. During this process, the portion of the glue transfer rod 43 exposed between the bottom end of the glue outlet channel 48 and the filter end of the cigarette paper tube 1 comes into contact with the scraper plate 5. The scraper plate 5 cleans the remaining glue on the glue transfer rod 43 until the glue transfer rod 43 returns to the glue outlet channel 48 and continues to move upward to the glue application position. This process is repeated continuously.

[0032] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A device for quantitatively dispensing adhesive onto the end face of a granular heated cigarette tube, characterized in that, include: The drum (2) can rotate around the central axis. Multiple tobacco grooves (21) are formed on the outer circumference of the drum (2) at equal intervals along the circumference. The tobacco paper tube (1) can be placed vertically in the tobacco groove (21) and rotate synchronously with the drum (2). It can also be separated from the tobacco groove (21). A glue pool (3) is provided on the drum (2) above each tobacco groove (21). Multiple glue dispensing head assemblies (4) are provided in the glue pool (3) directly above each tobacco groove (21). The filter end of the tobacco paper tube (1) is exposed upward and is always directly below the glue transfer rod (43) in the corresponding glue dispensing head assembly (4). The bottom end face of the glue transfer rod (43) is set according to the filter end. Cam (6) is suspended above drum (2) with a vertical gap between them. It is driven by lifting mechanism (62) to be raised and lowered. The bottom end face forms a ring-shaped groove (61) that is concave upward and coaxial with drum (2). The ring-shaped groove (61) is divided into glue application section (611), "0" position section (612), glue dispensing section (613), and transition section (614) according to different groove depths along the rotation direction of drum (2). The glue tank (3) is provided with a glue injection port and a cavity inside the tank for holding glue. Multiple vertical through-holes (31) are opened at the bottom end of the tank body according to the position and shape of each glue dispensing head assembly (4). The glue dispensing head assembly (4) is fitted in the installation hole (31) and rotates synchronously with the drum (2). The dispensing head assembly (4) includes a flow guide sleeve (41), a guide sleeve (42), and a dispensing rod (43) coaxially mounted from the outside to the inside, and also includes a return spring (44). The flow guide sleeve (41) is fitted into the mounting channel (31) to fit the flow guide sleeve (41). The flow guide sleeve (41) is divided into an upper region and a lower region by the guide sleeve (42). The bottom end has a dispensing channel (48) with dimensions adapted to the bottom end of the dispensing rod (43). The bottom end of the dispensing rod (43) has dimensions adapted to the dispensing channel (48) and is vertically slidably inserted into the guide sleeve (42), penetrating the flow guide sleeve (41) and connecting with the guide sleeve. The sleeve (42) together form a seal for the upper region. The outer peripheral wall of the rod and the inner peripheral wall of the guide sleeve (41) form an annular glue storage area (47) in the lower region. The glue liquid in the glue pool (3) can flow into the annular glue storage area (47) through the multiple seepage holes on the peripheral wall of the guide sleeve (41). The top of the glue transfer rod (43) is exposed above the glue pool (3) and always slides in the annular groove (61) of the cam (6). It rotates synchronously with the drum (2) and repeats the glue application section (611), "0" position section (612), glue dispensing section (613), and transition section (614) of the annular groove (61) in sequence. Sliding contact, and through the guidance of the guide sleeve (42), vertical displacement is formed in the guide sleeve (41), corresponding to the glue application position, "0" position, glue dispensing position, and transition position of the glue transfer rod (43), respectively; when the glue transfer rod (43) is in the glue application position, the bottom end face of the rod body extends directly below the glue dispensing channel (48), and a vertical distance a is left between it and the upper edge of the glue dispensing channel (48); from the glue application position, the distance a is moved down to the "0" position. When it is in the "0" position, the bottom end face of the rod body is flush with and in contact with the upper edge of the glue dispensing channel (48), forming a blockage of the glue dispensing channel (48); from the "0" position, the distance b is moved down to the glue dispensing position. When it is in the glue dispensing position, the bottom end of the rod body passes through the glue dispensing channel (48). The glue channel (48) has its bottom end exposed and in contact with the filter end of the cigarette paper tube (1) directly below, forming a glue application on the filter end face of the cigarette paper tube (1). From the glue application position, the return spring (44) gradually moves upward and resets to the glue application position through the transition position. The upward movement is the distance c. When in the transition position, the part of the glue transfer rod (43) exposed below the glue outlet channel (48) can contact the scraper plate (5). The scraper plate (5) is a fixed component independent of the drum (2). The plate surface is horizontal and extends between the guide sleeve (41) and the filter end of the cigarette paper tube (1). The plate segment used to contact the glue transfer rod (43) is made of flexible material.

2. The device for quantitative dispensing of adhesive onto the end face of the granular heated cigarette tube according to claim 1, characterized in that: The spacing a is 0.3 mm, the spacing b is 4 mm, and the spacing c is the sum of spacing a and spacing b, which is 4.3 mm.

3. The device for quantitative dispensing of adhesive onto the end face of the granular heated cigarette tube according to claim 1, characterized in that: The cam (6) is driven by the lifting mechanism (62) to descend a distance d from the initial position to the emergency stop position, or to move up a distance d from the emergency stop position to return to the initial position. The rubber transfer rod (43) descends synchronously with the cam (6) and can be restored to its original position when the cam (6) moves up by the return spring (44).

4. The apparatus for quantitative dispensing of adhesive onto the end face of a granular heated cigarette tube according to claim 1, 2, or 3, characterized in that, In the dispensing head assembly (4): Multiple seepage holes are distributed circumferentially on the peripheral wall of the guide sleeve (41). The seepage holes are composed of seepage grooves (45) and seepage ports (46). The seepage grooves (45) are vertical grooves opened from the top of the sleeve downward along the axial direction of the guide sleeve (41). The height area occupied is set according to the height range of the upper region. The seepage ports (46) are through holes opened radially along the bottom end of the seepage grooves (45) and located at the top of the lower region. They are used to communicate between the seepage grooves (45) and the lower region. The glue liquid in the glue tank (3) seeps into the annular glue storage area (47) of the guide sleeve (41) from the seepage grooves (45) through the seepage holes. When the glue transfer rod (43) is in the glue adding position, it seeps and hangs on the inner peripheral wall of the glue outlet channel.

5. The apparatus for quantitative dispensing of adhesive onto the end face of a granular heated cigarette tube according to claim 1, 2, or 3, characterized in that, In the dispensing head assembly (4): The top of the dispensing rod (43) is hemispherical, and its arc surface slides in the annular groove (61) of the cam (6). The return spring (44) is sleeved on the rod between the lower end of the hemispherical top and the top of the guide sleeve (41). The return spring (44) is compressed when the dispensing rod (43) is in the "0" position, the dispensing position, or the transition position.

6. The apparatus for quantitative dispensing of adhesive onto the end face of the granular heated cigarette tube according to claim 1 or 3, characterized in that: The cam (6) is suspended at the top by four sets of lifting mechanisms (62) mounted on the support frame (628). The four sets of lifting mechanisms (62) are centrally symmetrically distributed around the central axis of the cam (6). The lifting mechanism (62) includes a cylinder support roller (621), a lifting cylinder (622), and a lifting arm (623). The cylinder support roller (621) has a "b" shaped structure. The bottom end of the roller surface outside the short columnar roller body contacts the support frame (628), and it is rotatably mounted on the support frame (628) around the pivot at the bottom end. The top extends outward along the tangential direction to form a horizontal support plate. The lifting cylinder (622) is hinged to the free end of the horizontal support plate. The cylinder rod extends downward in the direction of the cam (6). A lifting spring (624) is sleeved on the cylinder rod. The lower end is hinged to the top of the cam (6). The two hinge axes are parallel to the central axis of the pivot. The lifting spring (624) is compressed when the cylinder rod extends downward.

7. The apparatus for quantitative dispensing of adhesive onto the end face of the granular heated cigarette tube according to claim 1 or 3, characterized in that: Multiple sets of evenly arranged buffer components are provided between the bottom of the cam (6) and the top of the drum (2). The buffer components include a buffer column (625), a buffer sleeve (626), and a buffer spring (627). The buffer column (625) is vertically installed in the glue pool (3) and protrudes between the drum (2) and the cam (6). The buffer spring (627) is sleeved on the buffer column. The buffer sleeve (626) is located at the bottom of the cam (6) and is vertically and movably sleeved on the exposed section of the buffer column (625). The buffer spring (627) deforms vertically, with its bottom end fixed and its top end connected to the buffer sleeve (626).

8. The apparatus for quantitative dispensing of adhesive onto the end face of the granular heated cigarette tube according to claim 1, characterized in that: The tobacco trough (21) is a semi-cylindrical through-slot that is radially concave and vertically penetrating along the drum (2). The trough wall is provided with suction holes that connect to the external negative pressure system. The tobacco paper tube (1) is placed vertically in the tobacco trough (21) in accordance with the negative pressure adsorption phase.

9. The apparatus for quantitative dispensing of adhesive onto the end face of the granular heated cigarette tube according to claim 1, characterized in that: The scraper (5) is arc-shaped and coaxial with the drum (2) in the section that contacts the glue transfer rod (43), and is made of EVA sponge.

10. The apparatus for quantitative dispensing of adhesive onto the end face of the granular heated cigarette tube according to claim 1, characterized in that: The top of the glue tank (3) is open, serving as the glue injection port.

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