Quantitative glue dispensing device for end surface of cigarette paper tube of granular heated cigarette

Abstract

A quantitative glue dispensing device for an end surface of a cigarette paper tube of a granular heated cigarette, comprising: a drum (2) which receives cigarette paper tubes (1) by using cigarette slots (21), a glue pool (3) encircling a drum body and comprising built-in glue dispensing head assemblies (4) being provided at a position above the cigarette slots (21), and filter tip ends of the cigarette paper tubes (1) being exposed upward and always located directly below glue transfer rods (43) in a corresponding set of glue dispensing head assemblies (4); and a cam (6), a circular groove (61) that is concave upward and coaxial with the drum (2) being formed on a bottom end surface of the cam (6) to come into sliding contact with the tops of the glue transfer rods (43), such that the glue transfer rods (43) rotate synchronously with the drum (2) and repeatedly switch between a glue replenishing position (611), a "0" position (612), a glue dispensing position (613), and a transition position (614) in sequence, thereby implementing quantitative glue dispensing, automatic cleaning after glue dispensing, and automatic glue replenishment after cleaning of the cigarette paper tubes (1). The device can implement annular-patterned glue discharge with an adjustable glue dispensing volume, can be automatically sealed after glue dispensing, can implement quantitative glue dispensing and the like, thereby improving the product quality and production efficiency.

Description

A device for quantitatively dispensing glue on the end surface of a granular heated cigarette paper tube Technical Field

[0001] The invention relates to the technical field of cigarette production, and more particularly to a device for quantitatively dispensing glue on the end surface of a paper tube of a granular heated cigarette. Background Art

[0002] Heated cigarettes, with their low-harm, low-risk features and a smoking experience similar to traditional cigarettes, are rapidly becoming the most promising new tobacco product and a hot area for future tobacco industry development. Among them, electrically heated cigarettes, with their advantages such as controllable heating temperature, flexible heating methods, and convenient and fashionable use, are currently a key development direction for heated cigarettes both domestically and internationally. Currently, leading international electrically heated cigarette brands include Philip Morris IQOS, Anglo-American GLO, Korea Tobacco's Lil, and Japan Tobacco's Ploom. Since their launch, sales have been booming, gradually becoming a major contributor to their profits.

[0003] Currently, heated cigarettes can be categorized by the form of their smoke-releasing materials: ordered sheet-type heated cigarettes, disordered sheet-type heated cigarettes, and granular heated cigarettes. Granular heated cigarettes, among others, use granular tobacco as their smoke-releasing material. Patents CN 109527638A, CN 109527639A, and CN 109512031A, among others, disclose the structure of granular heated cigarette sticks. Patents CN 108903065A, CN 109292115A, and CN201910809788.3 also disclose granular heated cigarette stick forming equipment. Furthermore, patent CN201910808764.6 discloses a device for continuous gluing the end surfaces of granular heated cigarette paper tubes. However, this gluing device utilizes a transfer gluing method, which has drawbacks such as difficulty controlling the amount of glue dispensed, the tendency for glue film formation to form, and the tendency for the cigarette stick to sway, which can cause particles to spill.

[0004] Summary of the Invention

[0005] In order to solve the above technical problems, the present invention proposes a rationally designed device for quantitative glue dispensing on the end face of a granular heated cigarette paper tube, in order to achieve the functions of a circular glue shape, adjustable glue dispensing amount, automatic sealing after glue dispensing, and quantitative glue dispensing, thereby improving product quality and production efficiency.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A device for quantitatively dispensing glue on the end surface of a paper tube of a granular heated cigarette, comprising:

[0008] The drum wheel is rotatable around the central axis, and a plurality of cigarette grooves are formed on the outer circumference of the wheel at equal intervals along the circumferential direction. Cigarette paper tubes can be placed upright in the cigarette grooves in an adaptive manner, rotate synchronously with the drum wheel, and can be separated from the cigarette grooves. A glue pool is provided on the drum wheel at a position above each cigarette groove, and a plurality of groups of glue dispensing head assemblies are correspondingly provided in the glue pool just above each cigarette groove. The filter end of the cigarette paper tube is exposed upward and is always directly below the glue transfer rod in the corresponding group of glue dispensing head assemblies. The outer dimensions of the bottom end surface of the glue transfer rod are set corresponding to the filter end.

[0009] The cam is hoisted above the drum with a vertical spacing between them. It is driven by the lifting mechanism to rise and fall. A circular groove is formed on the bottom end surface, which is concave upward and coaxial with the drum. The circular 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.

[0010] The glue tank is provided with a glue liquid injection port, and the cavity in the tank is used to contain the glue liquid. The bottom end of the tank body is provided with a plurality of vertical through and adapted mounting channels corresponding to the position and shape of each glue dispensing head assembly. The glue dispensing head assembly is sleeved in the mounting channels and rotates synchronously with the drum wheel.

[0011] The dispensing head assembly includes a guide sleeve, a guide sleeve, and a glue stick that are coaxially sleeved from the outside to the inside, and also includes a reset spring, which is adaptively sleeved in the installation channel through the guide sleeve. The guide sleeve is divided into an upper area and a lower area by the guide sleeve. The bottom end is provided with a glue outlet channel with an outer size adapted to the bottom end of the glue stick. The outer size of the bottom end of the glue stick is adapted to the glue outlet channel, and is vertically slidably arranged in the guide sleeve, passing through the guide sleeve, and together with the guide sleeve, forms a contact with the upper area. The outer peripheral wall of the rod and the inner peripheral wall of the guide sleeve are sealed to form an annular glue storage area in the lower area. The glue in the glue pool can flow into the annular glue storage area through the multiple seepage holes on the peripheral wall of the guide sleeve. The top of the glue transfer rod is exposed above the glue pool and is always slidably fitted in the annular groove of the cam. As the drum rotates synchronously, it repeatedly slides in contact with the glue adding section, "0" position section, glue dispensing section, and transition section of the annular groove in sequence, and is guided by the guide sleeve to form a vertical The displacement corresponds to the glue adding position, "0" position, glue dispensing position and transition position of the glue transfer stick respectively; when the glue transfer stick is in the glue adding position, the bottom end face of the stick body overhangs directly below the glue outlet channel, leaving a vertical distance a from the upper edge of the glue outlet channel; it moves down from the glue adding position by a distance a to the "0" position. When it is in the "0" position, the bottom end face of the stick body is flush with and in contact with the upper edge of the glue outlet channel, forming a blockage for the glue outlet channel; it moves down from the "0" position by a distance b to the glue dispensing position. When it is in the glue dispensing position, the bottom end of the stick body passes through the glue outlet channel, and the bottom end face It is exposed and contacts the filter end of the cigarette paper tube directly below, forming a glue point on the end surface of the filter end of the cigarette paper tube; it gradually moves upward from the glue point position through the transition position to the glue adding position by relying on the elastic force of the reset spring, and the upward movement amount is the spacing c. When it is in the transition position, the part of the glue transfer rod exposed below the glue outlet channel can contact the scraper plate. The scraper plate is a fixed component independent of the drum wheel, and the plate surface is horizontal and cantilevered between the guide sleeve and the filter end of the cigarette paper tube. The plate section used for contacting the glue transfer rod is made of flexible material.

[0012] The structural characteristics of the present invention are also:

[0013] The spacing a is 0.3 mm, the spacing b is 4 mm, and the spacing c is the sum of the spacing a and the spacing b, which is 4.3 mm.

[0014] 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 to return to the initial position. The glue transfer rod descends synchronously with the cam and can return to its original position when the cam moves up through a reset spring.

[0015] In the dispensing head assembly:

[0016] The multiple seepage holes on the peripheral wall of the guide sleeve are distributed at intervals around the circumference. The seepage holes are composed 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 guide sleeve, and the height area occupied is set corresponding to the height range of the upper area. The seepage port is a through hole opened at the bottom end of the seepage groove along the radial direction of the guide sleeve. The height position is located at the top of the lower area and is used for communication between the seepage groove and the lower area. The glue in the glue pool seeps from the seepage groove through the seepage hole into the annular glue storage area of ​​the guide sleeve. When the glue transfer rod is in the glue adding position, it seeps and hangs on the inner peripheral wall of the glue outlet channel.

[0017] In the dispensing head assembly:

[0018] The top of the glue transfer rod is hemispherical, and the arc surface slides in the annular groove of the cam. The reset spring is sleeved on the rod body between the lower end of the hemispherical top and the top of the guide sleeve. The reset spring is in a compressed state when the glue transfer rod is in the "0" position, the glue dispensing position, and the transition position.

[0019] The cam is hoisted at the top by four groups of lifting mechanisms installed on the vertical frame, and the positions of the four groups of lifting mechanisms are 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" type structure, and the bottom end of the outer roller surface of the short cylindrical roller body contacts the vertical frame and is rotatably arranged on the vertical frame around the rotating shaft at the bottom end. The top extends outward along the tangential direction to form a horizontal support plate. The lifting cylinder is hinged on the free end of the horizontal support plate, and the cylinder rod is extended in the direction facing the cam downward. A lifting spring is sleeved on the cylinder rod, and the lower end is hinged to the top of the cam. The two hinge shafts are parallel to the central axis of the rotating shaft. The lifting spring is compressed when the cylinder rod is extended downward.

[0020] A plurality of evenly arranged buffer components are arranged between the bottom of the cam and the top of the drum wheel. The buffer components include a buffer column, a buffer sleeve, and a buffer spring. The buffer column is vertically arranged in the glue pool, exposed between the drum wheel and the cam, and is sleeved with the buffer spring. The buffer sleeve is arranged at the bottom of the cam and is vertically movably sleeved on the exposed section of the buffer column. The buffer spring deforms vertically, with the bottom end fixed and the top end connected to the buffer sleeve.

[0021] The smoke trough is a semi-cylindrical through-trough that is concave inward along the radial direction of the drum and vertically penetrates. The groove wall is provided with suction holes connected to the external negative pressure system. The cigarette paper tube is placed upright in the smoke trough by relying on negative pressure adsorption.

[0022] The scraper plate, which is used for contacting the glue transfer rod, is arc-shaped and coaxial with the drum wheel, and is made of EVA sponge material.

[0023] The top of the glue pool is open and serves as the glue injection port.

[0024] Compared with the existing technology, the beneficial effects of the present invention are embodied in:

[0025] First, the dispensing amount has high control accuracy, which can achieve quantitative dispensing;

[0026] The conventional structure of the drum wheel is broken and modified on the basis of its existing structure. A glue pool with a glue dispensing head assembly is arranged above the cigarette paper tube, so that the glue dispensing head assembly placed in the glue pool and the cigarette paper tube rotate synchronously with the drum wheel. On this basis, a cam is added, and the circular groove of the cam is used to form a relative sliding along the circumferential direction with the glue transfer rod of the glue dispensing head assembly. The glue adding section, "0" position section, glue dispensing section, transition section with different groove depths are used to contact the glue transfer rod in sequence, so that the glue transfer rod produces a vertical relative displacement relative to the cigarette paper tube, thereby repeating the glue transfer rod in the glue adding position, "0" position, glue dispensing section, transition section and glue transfer rod. Switching between the glue position and the transition position in sequence, the glue outlet channel of the guide sleeve of the dispensing head assembly adds glue when in the glue adding position and is blocked from the annular glue storage area when in the "0" position. In the process of switching from the "0" position to the dispensing position, the glue attached to the inner wall of the glue outlet channel contacts the downward-moving glue transfer stick, so that the outer edge of the bottom end of the glue transfer stick that reaches the dispensing position carries a circle of glue, which is transferred to the circular end surface of the cigarette paper tube. Since the time the glue transfer stick is in the glue adding position is fixed and the hole depth of the glue outlet channel is fixed, the amount of glue carried by the bottom end of the glue transfer stick is stable each time it moves to the dispensing position, so that the dispensing amount control accuracy is high and quantitative dispensing is achieved;

[0027] Secondly, it can achieve annular glue discharge, which is better adapted to the round end surface of the cigarette paper tube;

[0028] Each time the glue transfer stick reaches the glue dispensing position, it contacts the inner wall of the glue outlet channel, and a circle of glue is carried on the outer edge of the bottom end of the glue transfer stick. This makes the glue printed on the filter end of the cigarette paper tube appear circular. In addition, since the outer dimensions of the bottom end of the glue transfer stick are adapted to the outer dimensions of the filter end of the cigarette paper tube, it can better adapt to the end face glue dispensing of the cigarette paper tube.

[0029] Third, the glue outlet can be automatically cleaned and closed after dispensing to prevent the product from being contaminated by glue flow;

[0030] During the process of switching the glue transfer rod from the glue dispensing position to the glue adding position, the glue transfer rod will pass through the transition position. At this time, an external fixed scraper is used to contact the stick body exposed between the glue outlet channel and the cigarette paper tube, thereby scraping the remaining glue on the stick body, achieving the effect of automatic cleaning of the glue transfer rod, avoiding contamination of the cigarette paper tube due to glue flow, and providing reliable guarantee for production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic diagram of the three-dimensional structure of the present invention;

[0032] FIG2 is a schematic diagram of the three-dimensional structure of the present invention when the cam is not shown;

[0033] Figure 3 is a schematic structural diagram of a cam;

[0034] FIG4 is a schematic diagram of the three-dimensional structure of the dispensing head assembly;

[0035] FIG5 is a schematic cross-sectional view of the dispensing head assembly;

[0036] Figure 6 is a schematic structural diagram of a scraper;

[0037] 7 is a schematic cross-sectional view of the present invention when the transfer stick is in the dispensing position and the adding position;

[0038] FIG8 is a schematic cross-sectional view of the present invention when the glue transfer rod is at the glue dispensing position and the “0” position respectively.

[0039] In the figure: 1 cigarette paper tube; 2 drum; 21 cigarette trough; 3 glue tank; 31 mounting channel; 4 glue dispensing head assembly; 41 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 scraper; 51 sponge plate segment; 6 cam; 61 annular groove; 611 glue adding segment; 612 "0" position segment; 613 glue dispensing segment; 614 transition segment; 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 DESCRIPTION

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in 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 part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0041] 1 to 8 , the device for quantitatively dispensing glue on the end surface of a paper tube for a granular heated cigarette in this embodiment includes:

[0042] The drum wheel 2 is rotatable about its central axis, and has a plurality of cigarette slots 21 equidistantly spaced along the circumferential direction formed on its outer circumference. The cigarette paper tube 1 can be placed upright in the cigarette slot 21, rotating synchronously with the drum wheel 2, and can be separated from the cigarette slot 21. A glue pool 3 is provided on the drum wheel 2 above each cigarette slot 21, and a plurality of groups of glue dispensing head assemblies 4 are provided in the glue pool 3 directly above each cigarette slot 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 group of glue dispensing head assemblies 4. The outer dimensions of the bottom end surface of the glue transfer rod 43 are set according to the filter end.

[0043] The cam 6 is hoisted above the drum 2 with a vertical spacing therebetween. It is driven by a lifting mechanism 62 to be raised and lowered. A circular groove 61 is formed on its bottom end surface and is concave upward and coaxial with the drum 2. The circular groove 61 is divided into a glue adding section 611, a "0" position section 612, a glue dispensing section 613, and a transition section 614 according to different groove depths along the rotation direction of the drum 2.

[0044] The glue tank 3 is provided with a glue liquid injection port. The cavity inside the tank is used to contain the glue liquid. The bottom end of the tank body is provided with a plurality of vertical through and adapted mounting holes 31 corresponding to the position and shape of each glue dispensing head assembly 4. The glue dispensing head assembly 4 is sleeved in the mounting holes 31 and rotates synchronously with the drum 2.

[0045] The dispensing head assembly 4 includes a guide sleeve 41, a guide sleeve 42, and a glue stick 43 which are coaxially mounted from the outside to the inside, and also includes a reset spring 44, which is adaptively mounted in the mounting hole 31 through the guide sleeve 41. The guide sleeve 41 is divided into an upper area and a lower area by the guide sleeve 42. The bottom end is provided with a glue outlet channel 48 whose outer dimensions are adapted to the bottom end of the glue stick 43. The outer dimensions of the bottom end of the glue stick 43 are adapted to the glue outlet channel 48. It is vertically slidable in the guide sleeve 42, passes through the guide sleeve 41, and forms a pair with the guide sleeve 42. The upper area is blocked, and the outer peripheral wall of the rod body and the inner peripheral wall of the guide sleeve 41 are surrounded in the lower area to form an annular glue storage area 47. The glue 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 is always slidably fitted in the annular groove 61 of the cam 6. As the drum wheel 2 rotates synchronously, it repeatedly slides in contact with the glue adding section 611, the "0" position section 612, the glue dispensing section 613, and the transition section 614 of the annular groove 61, and is guided by the guide sleeve 42. The vertical displacement formed in the guide sleeve 41 corresponds to the glue adding 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 adding position, the bottom end surface of the rod body is overhanging directly below the glue outlet channel 48, leaving a vertical distance a with the upper edge of the glue outlet channel 48; it moves downward from the glue adding position by a distance a to the "0" position, and when it is in the "0" position, the bottom end surface of the rod body is flush with and in contact with the upper edge of the glue outlet channel 48, forming a blockage for the glue outlet channel 48; it moves downward from the "0" position by a distance b to the glue dispensing position, and when it is in the glue dispensing position, the bottom end of the rod body passes through the glue outlet hole The bottom end surface of the glue rod 43 is exposed and contacts the filter end of the cigarette paper tube 1 directly below, forming a glue point on the filter end surface of the cigarette paper tube 1; from the glue point position, it gradually moves upward and resets to the glue adding position through the transition position by the elastic force of the reset spring 44, and the upward movement amount is the spacing c. When it is in the transition position, the part of the glue transfer rod 43 exposed below the glue outlet channel 48 can contact the scraper 5. The scraper 5 is a fixed component independent of the drum 2. The plate surface is horizontal and overhanging between the guide sleeve 41 and the filter end of the cigarette paper tube 1, and the plate section used for contacting the glue transfer rod 43 is made of flexible material.

[0046] In a specific implementation, the corresponding structural setting of the device also includes:

[0047] Taking the working speed of the drum 2 as 350 pieces / minute as an example, the spacing a is 0.3 mm, the spacing b is 4 mm, and the spacing c is the sum of the spacing a and the spacing b, which is 4.3 mm.

[0048] The cam 6 is driven by the lifting mechanism 62 to descend a distance d from its initial position to the emergency stop position, or to ascend a distance d from the emergency stop position and return to its initial position. The glue transfer 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 0 mm to 4.3 mm. The glue transfer rod 43 can be restored to its original position when the cam 6 moves upward by the return spring 44. The distance d is 0.3 mm.

[0049] Dispensing head assembly 4:

[0050] The multiple seepage holes on the peripheral wall of the guide sleeve 41 are distributed at intervals around the circumference. The seepage holes are composed of a seepage groove 45 and a seepage port 46. The seepage groove 45 is a vertical groove opened from the top of the sleeve downward along the axial direction of the guide sleeve 41. The height area occupied is set corresponding to the height range of the upper area. The top of the groove is exposed in the glue pool 3 and is connected. The seepage port 46 is a through hole opened at the bottom end 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 for communication between the seepage groove 45 and the lower area. The glue in the glue pool 3 seeps from the seepage groove 45 through the seepage hole 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.

[0051] Dispensing head assembly 4:

[0052] The top of the glue transfer rod 43 is hemispherical, and the arc surface slides in the annular groove 61 of the cam 6. A reset spring 44 is installed on the rod body between the lower end of the hemispherical top and the top of the guide sleeve 41. The reset spring 44 is in a compressed state when the glue transfer rod 43 is in the "0" position, the glue dispensing position, and the transition position.

[0053] The cam 6 is hoisted at the top by four sets of lifting mechanisms 62 mounted on a stand 628. The four sets of lifting mechanisms 62 are located symmetrically around the central axis of the cam 6. As an optional solution of this embodiment, the lifting mechanism 62 may be structured to 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, with the bottom end of the outer roller surface of the short cylindrical roller body in contact with the stand 628 and rotatably mounted on the stand 628 around the rotating shaft 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, with the cylinder rod extending downwardly 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 rotating shaft. The lifting spring 624 is compressed when the cylinder rod is extended downward. The lifting mechanism 62 and the cam 6, as well as the stand 628, are all detachably assembled and can be assembled by bolt connection.

[0054] A plurality of evenly spaced buffer components are provided between the bottom of the cam 6 and the top of the drum 2, which are used for buffering the cam 6 when it descends and assisting its ascent. The buffer components include a buffer column 625, a buffer sleeve 626, and a buffer spring 627. The buffer column 625 is vertically arranged in the glue pool 3, exposed between the drum 2 and the cam 6, and is sleeved with a buffer spring 627. The buffer sleeve 626 is provided at the bottom of the cam 6 and is vertically movably sleeved on the exposed section of the buffer column 625. The buffer spring 627 deforms vertically, with the bottom end fixed and the top end connected to the buffer sleeve 626.

[0055] The smoke trough 21 is a semi-cylindrical through-trough that is radially concave and vertically penetrates the drum 2. The groove wall is provided with suction holes connected to the external negative pressure system. The cigarette paper tube 1 is placed upright in the smoke trough 21 by negative pressure adsorption.

[0056] The plate section of the scraper plate 5 for contacting the glue transfer rod 43 is in an arc shape and is coaxial with the drum wheel 2 , and is a sponge plate section 51 made of EVA sponge material.

[0057] The top of the glue pool 3 is open and serves as a glue injection port. The glue supply method can be automatic or manual. In this embodiment, the glue supply is manual.

[0058] The functions of the main parts of this device are as follows:

[0059] First, the drum 2 is used to move the cigarette paper tube 1 in a circular motion;

[0060] Second, the glue tank 3 is used to provide glue for the glue dispensing head assembly 4 to dispense glue to the end surface of the filter tip of the cigarette paper tube 1;

[0061] Third, the glue dispensing head assembly 4 is respectively configured for each cigarette paper tube 1 on the drum wheel 2, and 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, and only produces relative displacement with the cigarette paper tube 1 along the central axis direction of the cigarette paper tube 1 (that is, vertically). The relative displacement of the glue transfer rod 43 realizes contact and separation with the end face of the filter tip of the cigarette paper tube 1. On this basis, the structure of the guide sleeve 41 of the glue dispensing head assembly 4 causes the glue in the glue pool 3 to flow to the lower area inside the sleeve and the glue outlet channel 48 at the bottom of the sleeve, so that the glue is attached to the inner hole wall of the glue outlet channel 48. Through contact with the vertically displaced glue transfer rod 43, a circle of glue is formed on the outer edge of the bottom end of the glue transfer rod 43, thereby completing quantitative glue dispensing on the end face of the filter tip of the cigarette paper tube 1 directly below, and realizing the glue outlet shape as a circular ring;

[0062] Fourthly, the cam 6, which is independent of the drum 2, remains stationary when the drum 2 rotates, and is used to cause the glue transfer rod 43 to produce relative displacement with the cigarette paper tube 1. The annular groove 61 allows the glue transfer rod 43 to repeatedly switch between the glue adding position, the "0" position, the glue dispensing position, and the transition position, so that the vertical spacing between the glue transfer rod 43 of the glue dispensing head assembly 4 and the filter end of the cigarette paper tube 1 changes regularly, and the height position relative to the glue outlet channel 48 also switches regularly accordingly, thereby achieving quantitative glue dispensing and automatic closure of the glue outlet channel 48 after glue dispensing. In addition, the function of the cam 6 is that when the machine is shut down for some reason or glue dispensing is not needed, the lifting mechanism 62 can be used to drive the cam 6 to descend, so that the glue transfer rod 43 can be moved down accordingly, and the glue outlet channel 48 can be urgently blocked by the glue transfer rod 43.

[0063] Furthermore, the amount of glue dispensed is adjusted by adjusting the vertical distance between the bottom end of the glue stick 43 and the upper edge of the glue outlet channel 48 when the glue is in the glue adding position. The vertical distance, that is, the distance a, is adjustable by adjusting the height position of the cam 6.

[0064] The following is a detailed description of the working principle of this device as the drum 2 rotates one circle:

[0065] 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 at the glue adding position. At this time, there is still a gap between the bottom end and the upper edge of the glue outlet channel 48 below. This gap a is 0.3 mm. 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. From the gap between the glue transfer rod 43 and the top opening of the glue outlet channel 48, the glue flows downward along the inner hole wall of the glue outlet channel 48 and is attached to the inner hole wall of the glue outlet channel 48.

[0066] 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 section 612 and is located at the "0" position. At this time, the bottom end 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, thereby preventing excessive glue from overflowing from the glue outlet channel 48.

[0067] Afterwards, the top of the glue transfer rod 43 slides along the annular groove 61 to fit into the glue dispensing section 613, and the glue transfer rod 43 gradually moves down along the glue outlet channel 48 by 4 mm to reach the glue dispensing position. During this process, the glue transfer rod 43 contacts the inner wall of the glue outlet channel 48, and the lower edge of the bottom end of the rod body carries a circle of glue liquid, which contacts the end face of the filter tip of the cigarette paper tube 1 directly below, and transfers the circle of glue liquid to the filter tip end of the cigarette paper tube 1, achieving quantitative glue dispensing and the glue discharge shape is annular;

[0068] After glue dispensing is completed, the top of the glue transfer stick 43 slides along the annular groove 61 until it fits into the transition section 614. The glue transfer stick 43 gradually moves upward along the glue outlet channel 48 by 4.3 mm, finally reaching the glue adding position. During this process, the portion of the glue transfer stick 43 exposed between the bottom end of the glue outlet channel 48 and the filter end of the cigarette paper tube 1 contacts the scraper 5. The scraping of the scraper 5 cleans the remaining glue on the glue transfer stick 43 until the glue transfer stick 43 returns to the glue outlet channel 48 and continues to move upward to the glue adding position. This cycle repeats.

[0069] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. An apparatus for quantitatively dotting glue on the end face of a paper tube of a granular heated cigarette, characterized in that, Including: A drum (2) that can rotate around its central axis. Multiple cigarette grooves (21) are formed on the outer circumference of the drum at equal intervals along the circumferential direction. The cigarette paper tube (1) can be erected in the cigarette grooves (21) in a matching manner, rotate synchronously with the drum (2), and can be separated from the cigarette grooves (21). A glue pool (3) that encircles the drum body is provided above each cigarette groove (21) on the drum (2). Multiple groups of dispensing head assemblies (4) are correspondingly arranged directly above each cigarette groove (21) in the glue pool (3). The filter tip end of the cigarette paper tube (1) faces upward and is always directly below the glue transfer rod (43) in a corresponding group of dispensing head assemblies (4). The outer dimension of the bottom end surface of the glue transfer rod (43) is correspondingly set according to the filter tip end; A cam (6) is hoisted above the drum (2) with a vertical spacing. It can be lifted and lowered by a lifting mechanism (62). A circular groove (61) that is concave upward and coaxial with the drum (2) is formed on the bottom end surface. The circular groove (61) is sequentially divided into a glue adding section (611), a "0" position section (612), a dispensing section (613), and a transition section (614) with different groove depths along the rotation direction of the drum (2); The glue pool (3) is provided with a glue injection port and an inner cavity for containing glue. Multiple vertically penetrating and matching installation holes (31) are correspondingly opened at the bottom end of the pool body according to the positions and shapes of the dispensing head assemblies (4). The dispensing head assemblies (4) are sleeved in the installation holes (31) and rotate synchronously with the drum (2); The dispensing head assembly (4) includes a flow guide sleeve (41), a guide sleeve (42), and a glue transfer rod (43) that are coaxially sleeved from outside to inside in sequence, and further includes a return spring (44). It is sleeved in the installation hole (31) through the flow guide sleeve (41) in a matching manner. The inner part of the flow guide sleeve (41) is divided into an upper region and a lower region by the guide sleeve (42). The bottom end is provided with a glue outlet hole (48) whose outer dimension is adapted to the bottom end of the glue transfer rod (43). The outer dimension of the bottom end of the glue transfer rod (43) is adapted to the glue outlet hole (48). It is vertically slidably inserted into the guide sleeve (42), penetrates through the flow guide sleeve (41), and jointly forms a seal for the upper region with the guide sleeve (42). A circular glue storage area (47) is formed by enclosing the outer peripheral wall of the rod and the inner peripheral wall of the flow guide sleeve (41) in the lower region. The glue in the glue pool (3) can flow into the circular glue storage area (47) through multiple seepage holes on the peripheral wall of the flow guide sleeve (41). The top of the glue transfer rod (43) is exposed above the glue pool (3) and is always slidably fitted in the circular groove (61) of the cam (6). It synchronously rotates with the drum (2) and repeatedly slides in contact with the glue adding section (611), "0" position section (612), dispensing section (613), and transition section (614) of the circular groove (61) in sequence, and forms a vertical displacement in the flow guide sleeve (41) through the guidance of the guide sleeve (42), corresponding to the glue adding position, "0" position, dispensing position, and transition position of the glue transfer rod (43) respectively. When the glue transfer rod (43) is in the glue adding position, the bottom end face of the rod body extends below the glue outlet hole (48), leaving a vertical distance a from the upper edge of the glue outlet hole (48). It moves down a distance a from the glue adding position to the "0" position. When 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 outlet hole (48), forming a seal for the glue outlet hole (48). It moves down a distance b from the "0" position to the dispensing position. When in the dispensing position, the bottom end of the rod body passes through the glue outlet hole (48), and the bottom end face is exposed and in contact with the filter tip end of the cigarette paper tube (1) directly below, forming glue dispensing on the end face of the filter tip end of the cigarette paper tube (1). From the dispensing position, relying on the elastic force of the return spring (44), it gradually moves up through the transition position and returns to the glue adding position, and the upward movement amount is a distance c. When in the transition position, the part of the glue transfer rod (43) exposed below the glue outlet hole (48) can contact the glue scraping plate (5). The glue scraping plate (5) is a fixed component independent of the drum (2). The plate surface is horizontal and extends between the flow guide sleeve (41) and the filter tip end of the cigarette paper tube (1). The plate section for contacting the glue transfer rod (43) is made of flexible material.

2. The device for quantitatively dotting glue on the end face of the paper tube of the granular heated cigarette according to claim 1, characterized in that: The distance a is 0.3 mm, the distance b is 4 mm, and the distance c is the sum of the distance a and the distance b, which is 4.3 mm.

3. The device for quantitatively dispensing glue at the end face of the paper tube of the granular heated cigarette according to claim 1, characterized in that: The cam (6) can be driven by a lifting mechanism (62) to descend a distance d from the initial position to the emergency stop position, or ascend a distance d from the emergency stop position and return to the initial position. The glue transfer rod (43) synchronously descends with the cam (6) and can return to its original position when the cam (6) ascends through the return spring (44).

4. The device for quantitatively dotting glue on the end face of the paper tube of the granular heated cigarette according to claim 1 or 2 or 3, characterized in that, In the dispensing head assembly (4): On the peripheral wall of the flow guiding sleeve (41), multiple seepage holes are circumferentially and spacedly distributed. The seepage holes are composed of a seepage groove (45) and a seepage port (46). The seepage groove (45) is a vertical groove opened axially downward from the top of the flow guiding sleeve (41), and the height area it occupies is correspondingly set according to the height range of the upper area. The seepage port (46) is a through hole opened radially along the bottom end of the seepage groove (45), and the height position where it is located is at the top of the lower area, used to communicate between the seepage groove (45) and the lower area. The glue liquid in the glue pool (3) seeps into the annular glue storage area (47) of the flow guiding sleeve (41) through the seepage groove (45) and the seepage holes, and seeps and adheres to the inner peripheral wall of the glue outlet channel when the glue transfer rod (43) is in the glue adding position.

5. The device for quantitatively dotting glue on the end face of the granular heated cigarette paper tube according to claim 1 or 2 or 3, characterized in that, In the dispensing head assembly (4): The top of the glue transfer rod (43) is hemispherical, and the arc surface is slidably fitted in the circular 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 end of the flow guiding sleeve (41). The return spring (44) is in a compressed state when the glue transfer rod (43) is in the "0" position, the dispensing position, and the transition position.

6. The device for quantitatively dotting glue on the end face of the paper tube of the granular heated cigarette according to claim 1 or 3, characterized in that: The cam (6) is hoisted at the top by four sets of lifting mechanisms (62) installed on the vertical frame (628). The positions of the four sets of lifting mechanisms (62) are 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, and the outer roller surface of the short columnar roller contacts the vertical frame (628) at the bottom end and is erected on the vertical frame (628) rotatably around the rotating shaft at the bottom end part. The top extends horizontally along the tangent. The lifting cylinder (622) is hinged to the free end of the horizontal support plate, and the extending direction of the cylinder rod faces downward towards 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 shafts are parallel to the central axis of the rotating shaft. The lifting spring (624) is compressed when the cylinder rod extends downward.

7. The device for quantitatively dotting glue on the end face of the paper tube of the granular heated cigarette according to claim 1 or 3, characterized in that: A plurality of buffer components are evenly arranged 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 erected in the glue pool (3), exposed between the drum (2) and the cam (6), and the buffer spring (627) is sleeved on it. The buffer sleeve (626) is arranged at the bottom of the cam (6) and is vertically movably sleeved on the exposed section of the buffer column (625). The buffer spring (627) deforms along the vertical direction, with the bottom end fixed and the top end connected to the buffer sleeve (626).

8. The device for quantitatively dotting glue on the end face of the paper tube of the granular heated cigarette according to claim 1, characterized in that: The cigarette groove (21) is a semi - cylindrical through - groove that is radially concave and vertically penetrating along the drum (2). The groove wall is provided with air suction holes connected to an external negative pressure system. The cigarette paper tube (1) is erected in the cigarette groove (21) by means of negative pressure adsorption in a matching manner.

9. The device for quantitatively dispensing glue at the end face of the paper tube of the granular heated cigarette according to claim 1, characterized in that: The plate section of the rubber scraping plate (5) for contacting the rubber transfer rod (43) is arc-shaped and coaxial with the drum (2), and is made of EVA sponge material.

10. The device for quantitatively dispensing glue at the end face of the paper tube of the granular heated cigarette according to claim 1, wherein: The top of the glue pool (3) is open and serves as the glue injection port.

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