Stroke adjusting mechanism and method and cigarette weight adjusting device

Abstract

The invention discloses a stroke adjusting mechanism and method and a cigarette weight adjusting device, and belongs to the technical field of stroke adjusting.The stroke adjusting mechanism comprises a driving motor, a worm and gear set, a plurality of gear sets, a connecting base, a swing shaft and a stroke output structure; the worm and gear set comprises a worm and a worm gear, the worm is connected with an output shaft of the driving motor, and the spiral face of the worm is meshed with gear teeth of the worm gear. The gear set comprises a gear shaft and a plurality of gears, and the gears are fixedly arranged on the periphery of the gear shaft in a sleeving mode. The worm gear fixedly sleeves the periphery of one gear shaft, so that the rotating speeds of the components of the same gear set are the same; the connecting seat is provided with a gear surface and a through hole; gear teeth of the gear surface are meshed with gear teeth of one gear; when the number of the gear sets is two or more, all the gear sets achieve transmission through gear meshing; the swing shaft is fixedly connected with the connecting seat through the through hole; the stroke output structure is fixedly connected with the swing shaft and used for outputting stroke. The problem that an existing stroke adjusting mechanism is prone to damage can be solved.

Description

Technical Field

[0001] The invention relates to a stroke adjustment mechanism and method and a cigarette weight adjustment device, belonging to the technical field of stroke adjustment. Background Art

[0002] When the weight control system of the ZJ116 cigarette making machine is working, microwave signals are used to detect the density of tobacco rods. Through algorithm calculation, the tobacco density signal is sent to the SRM weight control system. If the actual weight does not match the set weight, the vertical position of the suction belt is changed by the actuator to complete the weight adjustment. Due to the characteristics of Liqun brand cigarettes, the suction resistance and ventilation requirements are relatively high, and the weight control requirements are more precise. The frequency of operation of the weight adjustment system increases. During the production process, the failure rate of this mechanism is high, which seriously affects the stability of equipment operation.

[0003] The stroke adjustment mechanism of traditional cigarette weight adjustment, such as Figure 7 As shown, the mechanism includes a driving motor 16, a driving screw 17, a movable connecting buckle 19, a swing arm 18, a displacement detector 21, a swing shaft 9, a driving rod 20 and a roller 12; the output shaft of the driving motor 16 is connected to one end of the driving screw 17, the other end of the driving screw 17 is threadedly connected to the movable connecting buckle 19, the threaded connecting buckle 19 is fixedly connected to the swing arm 18, the swing arm 18 is connected to the displacement detector 21, the swing arm 18 is fixedly connected to one end of the driving rod 20 through the swing shaft 9, the other end of the driving rod 20 is fixedly connected to the axis of the roller 12 and can make the roller rotate around the axis; the signal of the driving motor 16 is connected to the displacement detector 21, and the signal of the displacement detector 21 is connected to the control system.

[0004] When the displacement detector 21 receives a signal from the control system, the drive motor 16 rotates forward and reversely to drive the swing arm 18 connected to the drive screw 17 to move up and down, and then drives the roller 12 to move up and down, adjusting the vertical distance between the suction ribbon 11 under the roller 12 and the chopping disc 14 below, and thus adjusting the amount of tobacco passing between the suction ribbon 11 and the chopping disc 14, so as to achieve the purpose of adjusting the weight of the cigarette. In order to accurately control the weight of the cigarette, the weight of the cigarette needs to be adjusted many times during the production process, which has a large impact force and a large load. The bearing capacity of the drive screw 16 is weak, and the combined structural design of the drive screw 16, the swing arm 16 and the drive rod 20 is not compact and has low precision.

[0005] Under the frequent operation of the stroke adjustment mechanism, a great inertial impact force is easily generated between the driving screw rod 16 and the movable connecting buckle 19, and the stroke adjustment mechanism is easily damaged and the accuracy cannot be guaranteed. Summary of the invention

[0006] The purpose of the present invention is to provide a stroke adjustment mechanism and a cigarette weight adjustment device to solve the problem that the existing stroke adjustment mechanism is easily damaged.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] In a first aspect, the present invention provides a stroke adjustment mechanism, comprising a drive motor, a worm gear set, a plurality of gear sets, a connecting seat, a swing shaft and a stroke output structure;

[0009] The worm gear assembly comprises a worm and a worm wheel, the worm is connected to the output shaft of the driving motor, and the helical surface of the worm is meshed with the gear teeth of the worm wheel;

[0010] The gear set includes a gear shaft and a plurality of gears, and the gears are fixedly sleeved on the outer circumference of the gear shaft;

[0011] The worm gear is fixedly sleeved on the outer periphery of a gear shaft so that the components of the same gear set have the same rotational speed;

[0012] The connecting seat is provided with a gear surface and a through hole; the gear teeth of the gear surface mesh with the gear teeth of a gear;

[0013] When there are two or more gear sets, each gear set realizes transmission through gear meshing;

[0014] The swing shaft is fixedly connected to the connecting seat through the through hole; the stroke output structure is fixedly connected to the swing shaft, and the stroke output structure is used for outputting the stroke.

[0015] For the aforementioned stroke adjustment mechanism, when there are two or more gear sets, each gear set can improve the overall load-bearing capacity and transmission efficiency of the gear set by adjusting the gear size and the number of teeth.

[0016] In the aforementioned stroke adjustment mechanism, when there are two gear sets, the gear set with the worm gear is the first gear set, and the other gear set is the second gear set;

[0017] The first gear set includes a first gear, the size and number of teeth of the first gear being smaller than the size and number of teeth of the worm gear;

[0018] The second gear set includes a second gear and a third gear; the second gear is meshed with the first gear, and the size and number of teeth of the second gear are greater than the size and number of teeth of the first gear;

[0019] The size and number of teeth of the third gear are smaller than those of the second gear;

[0020] The third gear teeth are meshed with the gear surface of the connecting seat.

[0021] The aforementioned stroke adjustment mechanism has a spacer sleeve between the components sleeved on the outer periphery of the gear shaft to assist in positioning the components.

[0022] The aforementioned stroke adjustment mechanism further comprises a frame, wherein the frame is provided with mounting holes for mounting the gear shaft, the swing shaft and the worm.

[0023] The aforementioned stroke adjustment mechanism, the gear shaft, the swing shaft and the worm are respectively provided with bearings connected to mounting holes at both ends, the inner rings of the bearings are respectively fixedly sleeved on the outer peripheries of the gear shaft, the swing shaft and the worm, and the outer rings of the bearings are nested and fixed in the mounting holes.

[0024] In a second aspect, the present invention provides a stroke adjustment method, which adopts the stroke adjustment mechanism described in the first aspect, wherein the drive motor signal is connected to the control system, the control system outputs a stroke adjustment signal, the drive motor receives the stroke adjustment signal and drives the worm gear group to rotate in forward and reverse directions, the worm gear group drives the gear group to rotate, the gear group drives the swing shaft to rotate, and the swing shaft drives the stroke output structure to adjust the output stroke.

[0025] In the third aspect, the present invention provides a cigarette weight adjustment device, which adopts the stroke adjustment mechanism described in any one of the first aspects, and the stroke output structure includes a drive rod and a roller, one end of the drive rod is fixedly connected to the swing shaft, and the other end of the drive rod is fixedly connected to the axis of the roller and can make the roller rotate around the axis.

[0026] The aforementioned cigarette weight adjustment device also includes a suction belt, a chopping knife disk and an air chamber guide rail. A suction belt is provided under the roller, and a chopping knife disk is provided under the suction belt. Air chamber guide rails are provided on both sides of the suction belt and the chopping knife disk. The suction belt, air chamber guide rails and the chopping knife disk form a cavity for tobacco to pass through. The stroke adjustment mechanism adjusts the upper and lower positions of the roller to push the suction belt to move up and down, thereby changing the height of the cavity to adjust the amount of tobacco passing through the cavity.

[0027] In the aforementioned cigarette weight adjustment device, a plurality of wheel grooves are provided on the roller working surface where the roller contacts the suction ribbon.

[0028] The beneficial effects achieved by the present invention are:

[0029] The present invention designs a worm gear group combined with a gear group transmission to replace the original screw transmission. The worm gear group and the worm gear mechanism have strong bearing capacity. After the worm gear group initially improves the transmission ratio, the gear group further improves the transmission ratio. The graded transmission improves the stability of the power transmission and solves the problem that the existing stroke adjustment mechanism is easily damaged.

[0030] The present invention utilizes the self-locking property of the worm gear set, and when the motor is adjusted in forward and reverse rotation, the response speed of the mechanism transmission direction change is fast and the control accuracy is high.

[0031] The invention adjusts the size and number of teeth of the gear set gears, and gradually improves the transmission ratio through graded transmission, so that the final transmission ratio of the invention reaches the same level as that of the existing stroke adjustment mechanism, thereby retaining the stability of power transmission and ensuring the floating accuracy of tobacco weight.

[0032] The present invention can also adopt the form of a combination of multiple gear sets to improve the load-bearing capacity and transmission efficiency. Multiple gear sets can improve the overall load-bearing capacity by reasonably allocating torque and power, and are suitable for heavy-load and high-speed operation occasions. By optimizing the parameters of each gear set, higher transmission efficiency can be achieved and energy loss can be reduced. Multiple gear sets can be combined into various complex transmission systems to achieve different transmission ratios, speeds and direction changes, and the overall mechanism volume can be flexibly adjusted to meet various transmission requirements.

[0033] The present invention adopts a worm gear and gear set transmission combination mechanism, which can achieve the stroke adjustment amount adjusted by the existing stroke adjustment mechanism, maintain the original electronic control system, and at the same time solve the problem that the existing stroke adjustment mechanism is easy to be damaged and has poor precision. The present invention has high adjustment accuracy, does not change the original installation position, does not need to change the control system, and reduces the risk of modification.

[0034] The stroke adjustment mechanism of the present invention has a strong bearing capacity. At the same time, due to the small stroke adjustment range involved in weight control, even if the working positions of the gears and worm gears are worn, the working positions of the gears and worm gears can be changed by an angle to continue to be used, thereby reducing the subsequent maintenance costs.

[0035] The patent of this invention is applicable to the improvement of the driving mechanism of the cigarette weight control system of all high-speed cigarette machines SRM. The patent of this invention is to improve the stability of cigarette weight, make the structure reliable, and reduce the downtime of the machine.

[0036] The patent of this invention is applicable to all high-speed cigarette machine cigarette weight control systems, in order to improve production efficiency, reduce product quality defects caused by unstable weight control, and safeguard cigarette production. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 This is a schematic diagram of the overall structure disassembly of a stroke adjustment mechanism according to Embodiment 1 of the present invention;

[0039] Figure 2 is a schematic diagram of the connection of the second gear set assembly of embodiment 1 of the present invention;

[0040] Figure 3 This is a schematic diagram of the connection base structure of Example 1 of the present invention;

[0041] Figure 4 is a schematic diagram of the connection between the stroke output structure and the swing shaft of the cigarette weight adjustment device of Example 3 of the present invention;

[0042] Figure 5 is a schematic diagram of the working effect of the roller in Example 3 of the present invention;

[0043] Figure 6 is a schematic side view of a partial structure of a cigarette weight adjustment device according to Embodiment 3 of the present invention;

[0044] Figure 7 It is a structural schematic diagram of an existing stroke adjustment mechanism.

[0045] Description of reference numerals:

[0046] 1-worm; 2-pin; 3-first gear; 4-worm wheel; 5-second gear; 6-third gear; 7-first gear shaft; 8-second gear shaft; 9-swing shaft; 10-connecting seat; 101-gear surface; 102-through hole; 11-suction ribbon; 12-roller; 13-wheel groove; 14-chopping knife disc; 15-tobacco; 16-driving motor; 17-driving screw rod; 18-swinging arm; 19-movable connecting buckle; 20-driving rod; 21-displacement detector; 22-spacer; 23-bearing; 24-frame; 25-mounting hole; 26-wind chamber guide rail; 27-plug. DETAILED DESCRIPTION

[0047] The following will be combined with the accompanying drawings of the present invention to clearly and completely describe the technical solutions in the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only used to explain the relative positional relationship, movement, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly. It is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0049] In addition, in the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0050] Embodiment 1

[0051] The reasons why the existing stroke adjustment mechanism is easily damaged are analyzed as follows:

[0052] 1. Weight adjustment movements are frequent and the impact force is large.

[0053] The driving mechanism of the weight control system is constantly and repeatedly adjusted to maintain the actual weight within the allowable deviation range of the rated weight. According to actual observations, the driving mechanism works about 45 times per minute, frequently going from rest to completing the weight adjustment process, and a huge inertial impact force is generated between the threaded plunger and the screw.

[0054] 2. The bearing load is large, and the bearing capacity of the plunger and screw is weak.

[0055] The advantage of the screw transmission structure is that the lead is small, but the bearing capacity is weak. During the weight adjustment process, it is necessary to overcome the negative pressure wind force of the air chamber of 10000pa and the tension of the suction wire. The large load and the alternating load accelerate the wear between the screw and the threaded plunger, and even cause the screw thread to break, glue, motor damage and other problems.

[0056] 3. The structural design is not compact and the precision is low.

[0057] The original device has a fixed motor position, and its lead screw as the transmission shaft transmits torque in a cantilever beam-like force mode. During operation, the plunger connected to the transmission shaft causes the transmission shaft to bend, which results in a large gap between the threaded plunger and the transmission shaft, aggravating the wear of the threaded plunger, reducing the transmission accuracy, and affecting the ability of the SRM weight control system to accurately adjust the amount of tobacco in the suction ribbon.

[0058] This embodiment introduces a stroke adjustment mechanism, such as Figure 1 As shown, a stroke adjustment mechanism is characterized in that it includes a driving motor, a worm gear set, a plurality of gear sets, a connecting seat 10, a swing shaft 9 and a stroke output structure;

[0059] The worm gear assembly comprises a worm 1 and a worm wheel 4, wherein the worm 1 is connected to the output shaft of the driving motor, and the helical surface of the worm 1 is meshed with the gear teeth of the worm wheel 4;

[0060] The gear set includes a gear shaft and a plurality of gears, and the gears are fixedly sleeved on the outer circumference of the gear shaft;

[0061] The worm gear 4 is fixedly sleeved on the outer circumference of a gear shaft so that the components of the same gear set have the same rotational speed;

[0062] The turbine 4 and each gear are fixed to the corresponding gear shaft by means of positioning pins;

[0063] like Figure 3 As shown, the connecting seat 10 is provided with a gear surface 101 and a through hole 102; the gear teeth of the gear surface 101 mesh with the gear teeth of a gear;

[0064] When there are two or more gear sets, each gear set realizes transmission through gear meshing;

[0065] The swing shaft 9 is fixedly connected to the connecting seat 10 through the through hole 102. Figure 1 and Figure 3 As shown, the swing shaft 9 is fixedly connected to the connecting seat 10 through the pin 2; the stroke output structure is fixedly connected to the swing shaft 9, and the stroke output structure is used to output the stroke.

[0066] The present invention solves the problem that the existing stroke adjustment mechanism is easily damaged by replacing the existing combination of a lead screw and a movable connecting buckle with a worm gear set combined with a gear set.

[0067] When there are two or more gear sets, the overall load-bearing capacity and transmission efficiency of each gear set are improved by adjusting the gear size and the number of teeth.

[0068] In this embodiment, there are two gear sets, the gear set with the worm gear 4 is the first gear set, and the other gear set is the second gear set;

[0069] The first gear set includes a first gear shaft 7 and a first gear 3. The size and number of teeth of the first gear 3 are smaller than those of the worm wheel 4. The first gear 3 and the turbine wheel 4 are fixedly sleeved on the outer periphery of the first gear shaft 7. The transmission ratio between the first gear 3 and the turbine wheel 4 is 1:1. The transmission ratio refers to the ratio of the angular velocity of the driving wheel to the driven wheel, which is also equal to the ratio of the number of teeth of the driven wheel to the number of teeth of the driving wheel, or the inverse ratio of the speed of the driving wheel to the speed of the driven wheel. The first gear 3 is used for transmission between the first gear set and the second gear set.

[0070] like Figure 2As shown, the second gear set includes a second gear shaft 8, a second gear 5 and a third gear 6; the second gear 5 is meshed with the first gear 3, the size and the number of teeth of the second gear 5 are larger than the size and the number of teeth of the first gear 3, the second gear 5 serves as the driven wheel of the first gear 3, and a larger transmission ratio can be obtained by meshing the first gear with a smaller size and a larger number of teeth with the second gear 5 with a larger size and a larger number of teeth;

[0071] The size and number of teeth of the third gear 6 are smaller than those of the second gear 5;

[0072] The gear teeth of the third gear 6 mesh with the gear surface 101 of the connecting seat 10. Figure 3 As shown, the size and number of teeth of the driven wheel represented by the gear surface 101 of the connecting seat 10 are greater than the size and number of teeth of the third gear 6, so the transmission ratio is further increased.

[0073] The present invention increases the transmission ratio primarily through the worm gear set and then increases the transmission ratio sequentially through the gear set, thereby improving the overall bearing capacity and transmission efficiency of the gear set as a whole and the stroke adjustment mechanism.

[0074] In order to further improve the positioning stability between the gear set components, such as Figure 1 and Figure 2 As shown, a spacer sleeve 22 for assisting component positioning is provided between the components sleeved on the outer periphery of the gear shaft.

[0075] like Figure 1 As shown, the stroke adjustment mechanism further includes a frame 24, and the frame 24 is provided with a mounting hole 25 for mounting the gear shaft, the swing shaft 9 and the worm 1. The gear shaft, the swing shaft 9 and the worm 1 are respectively provided with bearings 23 connected to the mounting holes 25 at both ends, and the inner rings of the bearings 23 are respectively fixedly sleeved on the outer peripheries of the gear shaft, the swing shaft 9 and the worm 1, and the outer rings of the bearings 23 are nested and fixed in the mounting holes 25.

[0076] Figure 1 The schematic diagram of the overall structure disassembly of the stroke adjustment mechanism shows an implementation form of the frame 24 and a disassembled form of the frame 24. The various parts of the frame 24 can be fixedly connected by screw threads.

[0077] Embodiment 2

[0078] This embodiment introduces a stroke adjustment method, which uses the stroke adjustment mechanism introduced in Embodiment 1 to adjust the stroke, the drive motor signal is connected to the control system, when it is detected that the tobacco weight does not meet the standard, the control system outputs a stroke adjustment signal, the drive motor receives the stroke adjustment signal and drives the worm gear group to rotate in forward and reverse directions, the worm gear group drives the gear group to rotate, the gear group drives the swing shaft 9 to rotate, the swing shaft 9 drives the stroke output structure to adjust the output stroke, the control system receives tobacco weight detection information, when it is detected that the tobacco weight does not meet the standard, the control system outputs a stroke adjustment signal according to the tobacco weight detection information, and cyclically executes the above process to dynamically adjust the tobacco weight.

[0079] Embodiment 3

[0080] This embodiment introduces a cigarette weight adjustment device, including the stroke adjustment mechanism introduced in embodiment 1, such as Figure 1 and Figure 4 As shown, the stroke output structure includes a driving rod 20 and a roller 12, one end of the driving rod 20 is fixedly connected to the swing shaft 9, and the other end of the driving rod 20 is fixedly connected to the axis of the roller 12 and can make the roller rotate around the axis.

[0081] Combination Figure 4 , Figure 5 and Figure 6 As shown, the cigarette weight adjustment device of the present invention also includes a suction belt 11, a chopping knife disk 14 and an air chamber guide rail 26. The suction belt 11 is provided below the roller 12, and the chopping knife disk 14 is provided below the suction belt 11. Air chamber guide rails 26 are provided on both sides of the suction belt 11 and the chopping knife disk 14. The suction belt 11, the air chamber guide rail 26 and the chopping knife disk 14 form a cavity for tobacco 15 to pass through. The stroke adjustment mechanism adjusts the upper and lower positions of the roller 12 to push the suction belt 11 to move up and down, and changes the height of the cavity to adjust the amount of tobacco passing through the cavity.

[0082] The swing shaft 9, the driving rod 20 and the roller 12 of the present invention are integrated as a whole. Figure 4 As shown, the solid line is the current position of the swing shaft 9, the driving rod 20, the roller 12 and the suction belt 11. When the swing shaft 9 rotates counterclockwise, the driving rod 20 and the roller 12 are driven to move downward to Figure 4 At the position of the dotted line, correspondingly, under the downward pressure of the roller 11, the suction belt 11 moves downward to the position of the dotted line, the distance between the suction belt 11 and the chopping knife disk 14 decreases, the amount of tobacco passing through also decreases, and the weight of tobacco decreases. Similarly, when the swing shaft 9 rotates clockwise, it drives the driving rod 20 and the roller 12 to move upward, and correspondingly, under the upward lifting action of the roller 11, the suction belt 11 moves upward, the distance between the suction belt 11 and the lower chopping knife disk 14 increases, the amount of tobacco passing through also increases, and the weight of tobacco increases.

[0083] The suction belt 11 is a porous conveying mesh belt, the back of which is connected to the suction chamber. During the operation of the cigarette making machine, the suction belt 11 uses the negative pressure generated by the suction chamber to absorb the tobacco from the air duct and tightly absorb it on the surface of the mesh belt. In this process, the tobacco is continuously and stably conveyed to the cigarette gun to form a tobacco bundle, which provides the necessary raw materials for the subsequent cigarette rolling.

[0084] The air chamber guide 26 is a guide structure installed inside the air chamber body of the cigarette making machine, usually composed of two left and right guide bodies, which may also be thermally sprayed with an integrated right-angled hard alloy sheet to increase wear resistance and service life. The design of the guide body usually takes into account the flow characteristics and shaping requirements of the tobacco in the cigarette making process to ensure that the tobacco can move stably along the predetermined trajectory and be arranged into the required shape.

[0085] The chopping disc 14 is a tool device specially designed for use in a cigarette making machine, and is usually installed below or near the suction belt. In this embodiment, the chopping disc 14 is arranged below the suction belt 11. The main purpose of the chopping disc is to improve the uniformity of the tobacco bundle and form a "tight head" to reduce empty ends of cigarettes and improve the quality of cigarettes.

[0086] When the position of the chopping knife disk 14 remains unchanged, the stroke adjustment mechanism changes the vertical position of the suction belt 11 and thus changes the distance between the suction belt 11 and the chopping knife disk 14, so that the amount of tobacco passing through changes, thereby achieving tobacco weight adjustment.

[0087] When the stroke adjustment method of this embodiment is applied to the tobacco processing process, taking the new version of Liquan cigarettes as an example, the weight of the cigarettes within the qualified range is 845mg±70mg. When the SRM weight control system finds that the actual weight does not match the set weight, that is, the minimum weight of the cigarette is lower than 775mg or the maximum weight is higher than 915mg, the control system outputs a stroke adjustment signal, and adjusts the stroke through the stroke adjustment mechanism of Example 1 to control the amount of tobacco passing through, thereby adjusting the weight of the tobacco.

[0088] If the surface of the roller 12 is worn, the suction belt will become loose, making it easy for the roller 12 and the suction belt 11 to slip, resulting in quality defects of empty cigarettes. The working surface of the roller of the present invention is made of cemented carbide material, which has enhanced wear resistance and can increase the friction between the roller 12 and the suction belt 11.

[0089] In order to further reduce the empty cigarette rate, the working surface of the roller 12 where the roller 12 contacts the suction belt 11 is provided with a plurality of wheel grooves 13. Figure 6As shown, the working surface of the roller 12 is provided with two wheel grooves 13, which are used to reduce the contact area between the roller and the suction belt 11, so that a certain amount of negative pressure wind can act on the tobacco 15 through the suction belt 11, thereby increasing the stability of tobacco running, reducing the problem of empty cigarettes, and improving product quality. It is worth noting that Figure 6 The rectangular cross-section of the wheel groove 13 shown is only one wheel groove shape and should not be regarded as a limitation on the wheel groove shape. The wheel groove 13 may also be other regular or irregular shapes.

[0090] The present invention adds a plug 27 at the connection between the frame 24 and the gear shaft to seal and prevent dust, reduce wear of parts, and improve control accuracy.

[0091] The invention uses the transmission mode of worm driving worm wheel to make the internal structure of the device compact, and the installation space is sufficient to accommodate the original SRM weight control system, thus reducing the cost. In addition, because the transmission ratio of worm wheel transmission is relatively large, the control accuracy is improved.

[0092] The patent of the present invention partially adopts a worm gear group, which has self-locking properties. When the motor is adjusted forward and reverse, the response speed of the mechanism transmission direction change is fast and the control accuracy is high.

[0093] The present invention utilizes a worm and worm gear combination to ensure a reliable structure, long service life, precise control, and controllable weight of a single cigarette. The patent of the present invention is applicable to the improvement of the drive module of the cigarette weight control system of all high-speed cigarette machines SRM.

[0094] The patented mechanism of the present invention has a strong bearing capacity and a small transmission travel range. Even if the working position is worn, the working position of the gear, worm wheel and worm can be changed by an angle, thereby reducing the subsequent maintenance costs.

[0095] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A stroke adjustment mechanism, characterized in that: It comprises a driving motor, a worm gear set, a plurality of gear sets, a connecting seat (10), a swing shaft (9) and a stroke output structure; The worm gear assembly comprises a worm (1) and a worm wheel (4), the worm (1) being connected to an output shaft of a drive motor, and the helical surface of the worm (1) meshing with the gear teeth of the worm wheel (4); The gear set includes a gear shaft and a plurality of gears, and the gears are fixedly sleeved on the outer circumference of the gear shaft; The worm gear (4) is fixedly sleeved on the outer circumference of a gear shaft so that the components of the same gear set have the same rotational speed; The connecting seat (10) is provided with a gear surface (101) and a through hole (102); the gear teeth of the gear surface (101) mesh with the gear teeth of a gear; When there are two or more gear sets, each gear set realizes transmission through gear meshing; The swing shaft (9) is fixedly connected to the connecting seat (10) via the through hole (102); the stroke output structure is fixedly connected to the swing shaft (9), and the stroke output structure is used to output the stroke.

2. The stroke adjustment mechanism according to claim 1, characterized in that: When there are two or more gear sets, the overall load-bearing capacity and transmission efficiency of each gear set are improved by adjusting the gear size and the number of teeth.

3. The stroke adjustment mechanism according to claim 2, characterized in that: When there are two gear sets, the gear set on which the worm gear (4) is mounted is the first gear set, and the other gear set is the second gear set; The first gear set comprises a first gear (3), the size and number of teeth of the first gear (3) being smaller than the size and number of teeth of the worm gear (4); The second gear set comprises a second gear (5) and a third gear (6); the second gear (5) is meshed with the first gear (3), and the size and number of teeth of the second gear (5) are greater than the size and number of teeth of the first gear (3); The size and number of teeth of the third gear (6) are smaller than the size and number of teeth of the second gear (5); The gear teeth of the third gear (6) mesh with the gear surface (101) of the connecting seat (10).

4. The stroke adjustment mechanism according to claim 1, characterized in that: A spacer sleeve (22) for assisting component positioning is provided between the components sleeved on the outer circumference of the gear shaft.

5. The stroke adjustment mechanism according to claim 1, characterized in that: The stroke adjustment mechanism further comprises a frame (24), wherein the frame (24) is provided with a mounting hole (25) for mounting the gear shaft, the swing shaft (9) and the worm (1).

6. The stroke adjustment mechanism according to claim 5, characterized in that: Bearings (23) connected to mounting holes (25) are respectively provided at both ends of the gear shaft, the swing shaft (9) and the worm (1); inner rings of the bearings (23) are respectively fixedly sleeved on the outer circumferences of the gear shaft, the swing shaft (9) and the worm (1); and outer rings of the bearings (23) are nested and fixed in the mounting holes (25).

7. A stroke adjustment method, characterized in that: The stroke is adjusted by using the stroke adjustment mechanism according to any one of claims 1 to 6, the drive motor signal is connected to the control system, the control system outputs a stroke adjustment signal, the drive motor receives the stroke adjustment signal and drives the worm gear group to rotate in forward and reverse directions, the worm gear group drives the gear group to rotate, the gear group drives the swing shaft (9) to rotate, and the swing shaft (9) drives the stroke output structure to adjust the output stroke.

8. A cigarette weight adjustment device, characterized in that: It comprises the stroke adjustment mechanism according to any one of claims 1 to 6, wherein the stroke output structure comprises a driving rod (20) and a roller (12), one end of the driving rod (20) is fixedly connected to the swing shaft (9), and the other end of the driving rod (20) is fixedly connected to the axis of the roller 12 and can make the roller rotate around the axis.

9. The cigarette weight adjustment device according to claim 8, characterized in that: It also comprises a suction belt (11), a chopping knife disk (14) and a wind chamber guide rail (26); a suction belt (11) is provided below the roller (12); a chopping knife disk (14) is provided below the suction belt (11); wind chamber guide rails (26) are provided on both sides of the suction belt (11) and the chopping knife disk (14); the suction belt (11), the wind chamber guide rail (26) and the chopping knife disk (14) form a cavity through which tobacco (15) can pass; the stroke adjustment mechanism adjusts the upper and lower positions of the roller (12) to push the suction belt (11) to move up and down, thereby changing the height of the cavity to adjust the amount of tobacco passing through the cavity.

10. The cigarette weight adjustment device according to claim 9, characterized in that: A plurality of wheel grooves (13) are formed on a working surface of the roller (12) where the roller (12) contacts the suction wire (11).

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