Paperless hollow filter rod diameter adjustment device

Abstract

The present invention provides a paperless hollow filter rod diameter adjustment device, comprising a sealing body, a lower surface of the sealing body is provided with a forming groove for adjusting the diameter of the paperless hollow filter rod by downward pressure, and also comprising a fixed bearing assembly, a floating bearing assembly and an adjusting bolt assembly, wherein the fixed bearing assembly and the floating bearing assembly are respectively adjustable and arranged at both ends of the sealing body; the adjusting bolt assembly is adjustable and arranged above the middle of the sealing body; the fixed bearing assembly, the floating bearing assembly and the adjusting bolt assembly are respectively used to adjust their own lengths to press down the sealing body, so as to change the pressure generated by the forming groove on the paperless hollow filter rod. The paperless hollow filter rod diameter adjustment device can timely adjust the parameters such as the diameter, roundness, circumference, etc. of the paperless hollow filter rod during high-speed production, thereby improving the production efficiency of the paperless hollow filter rod.

Description

Technical Field

[0001] The invention relates to the field of tobacco machinery, in particular to a paperless hollow filter rod diameter adjustment device. Background Art

[0002] At present, as a filter rod with a special appearance, the market space for paperless hollow filter rods is developing rapidly. At the same time, with the rapid growth of heated cigarettes in recent years, the demand for paperless hollow filter rods is strong and the market prospects are broad. All cigarette industrial enterprises have increased their research and development efforts on paperless hollow filter rods. Compared with traditional filter rods, paperless hollow filter rods lack forming paper wrapping and molding, and the filter rod is hollow without filament bundles. Parameters such as diameter, roundness, and circumference are difficult to guarantee during high-speed operation, and can only be produced at low speed.

[0003] The invention patent application with application publication number CN116636645A discloses a paperless filter rod forming device and method, which is installed between a tow opener and a filter rod forming machine, and the running speed is synchronized with the filter rod forming machine. And it includes a wire catcher in sequence along the direction of movement of the tow, which guides the fluid to pass the fiber tow material opened by the tow opener through its body and further fluff it. The molding mandrel can inject fluid into the fluffy fiber tow to promote its molding and determine the inner cavity shape of the filter rod. The molding nozzle is located downstream of the wire catcher, wherein the injected fluid extrude and heat the fiber tow to form the overall shape of the filter rod. The curing nozzle is located downstream of the molding nozzle to cure the filter rod. The positioning table can be manually mechanically or electromechanically actuated to adjust the direction or position of the molding mandrel and the wire catcher. The molding mandrel frame supports the mandrel and can introduce fluid into the mandrel, and can be mechanically or electrically actuated to increase the change in the inner cavity shape of the filter rod. The paperless filter rod forming equipment can produce ordinary paperless filter rods, paperless hollow filter rods, paperless intermittent hollow filter rods, paperless outer shape filter rods, paperless double shape filter rods and intermittent hollow paperless double shape filter rods, but does not have the function of locally adjusting the filter rod diameter. Summary of the invention

[0004] In order to timely adjust the diameter, roundness, circumference and other parameters of the paperless hollow filter rod in the high-speed production process and improve the production efficiency of the paperless hollow filter rod, the technical scheme adopted by the present invention is: a paperless hollow filter rod diameter adjustment device, comprising a sealing body, the lower surface of the sealing body is provided with a forming groove for adjusting the diameter of the paperless hollow filter rod by relying on downward pressure, It also includes a fixed bearing assembly, a floating bearing assembly and an adjusting bolt assembly, wherein the fixed bearing assembly and the floating bearing assembly are respectively adjustable and arranged at two ends of the sealing body; the adjusting bolt assembly is adjustable and arranged above the middle part of the sealing body; The fixed bearing assembly, the floating bearing assembly and the adjusting bolt assembly are respectively used to press down the sealing body by adjusting their own lengths, so as to change the pressure generated by the forming groove on the paperless hollow filter rod.

[0005] Based on the above, in order to facilitate fixing, the fixed bearing assembly, the floating bearing assembly and the adjusting bolt assembly are respectively connected to the same cover plate, and the floating bearing assembly is adjustable along the width direction of the cover plate.

[0006] Based on the above, in order to achieve secondary pressure transmission and ensure that both ends of the sealing body can be subjected to downward pressure during the adjustment process, a lever assembly is connected to the bottom of the adjusting bolt assembly, and the lever assembly is connected to the lower side of the cover plate. The adjusting bolt assembly is deformed by pressing down the lever assembly, thereby pressing down the two ends of the sealing body.

[0007] Based on the above, in order to improve production efficiency, it includes a pair of sealing bodies, a pair of the fixed bearing assemblies, a pair of the floating bearing assemblies and a pair of the adjusting bolt assemblies; A fixed bearing assembly and a floating bearing assembly are respectively arranged at two ends of the same sealing body; A pair of floating bearing assemblies are respectively adjustably arranged along the width direction of the cover plate, and are used to control the parallelism between the pair of sealing bodies.

[0008] Based on the above, in order to improve the adjustment accuracy, the axis of the fixed bearing assembly, the axis of the floating bearing assembly and the axis of the adjusting bolt assembly are respectively parallel to the axis of the paperless hollow filter rod.

[0009] Based on the above, the lever assembly includes a connecting block, an adjusting rod, a fixed shaft, a bumper, an elastic pin, and a bridge block; The connecting block and the building block are respectively connected to the lower surface of the cover plate; The two ends of the adjusting rod are rotatably connected to the connecting block through the fixed shaft, and the middle of the adjusting rod is provided with an adjusting gap that can move up and down and forward and backward; The side of the adjusting rod is provided with an elastic pin used in conjunction with the block, and the block is distributed on one side of the adjusting rod and is used to limit the deformation of the elastic pin; The bumping balls are arranged at both ends of the adjusting rod, and the lower ends of the bumping balls are in contact with the upper surface of the sealing body; The adjusting bolt assembly deforms the adjusting rod by pressing down the adjusting gap, and then presses down the two ends of the sealing body symmetrically through the bumping balls at the two ends.

[0010] Based on the above, the lower end of the fixed bearing assembly and the lower end of the floating bearing assembly are respectively connected with a connecting shaft assembly, and the interior of the fixed bearing assembly and the interior of the floating bearing assembly are respectively provided with elastic elements; The upper ends of the connecting shaft assemblies are in contact with the elastic elements respectively, and the lower ends of the connecting shaft assemblies are connected to the sealing body; The fixed bearing assembly and the floating bearing assembly generate downward pressure on the connecting shaft assembly by changing the deformation amount of the elastic element, thereby pressing down the sealing body.

[0011] Wherein, through holes for the connecting shaft assembly to pass through are respectively opened at both ends of the adjusting rod, so that when the sealing body is pressed down by the fixed bearing assembly and the floating bearing assembly, the lever assembly will not be pressed down.

[0012] The present invention has substantial characteristics and progress compared to the prior art. Specifically, the paperless hollow filter rod diameter adjustment device provided by the present invention uses a fixed bearing assembly and a floating bearing assembly to adjust the diameter of the paperless hollow filter rod during the assembly and debugging stage. When adjusting the fixed bearing assembly, the diameter of the filter rod can be adjusted; when adjusting the floating bearing assembly, the diameter of the filter rod can be adjusted and the filter rod can be aligned. The diameter of the filter rod can be adjusted during the production process using an adjusting bolt, thereby realizing the diameter adjustment of the production of dual-channel paperless hollow filter rods.

[0013] At the same time, the fixed bearing assembly adopts precision fit, and the floating bearing assembly adopts clearance fit, and the axes of both fall on the axis of the filter rod. The fixed bearing assembly can only move in the Z direction, and the diameter of the filter rod is adjusted during the assembly and debugging stage of the filter rod forming machine. The floating bearing assembly can move on the Y axis and Z axis, and can be adjusted during the assembly and debugging stage of the filter rod forming machine. It has both filter rod centering adjustment and diameter adjustment functions. The adjusting bolt assembly adopts a two-level adjustment method, and its axis also falls on the axis of the filter rod. The block is made of PEEK material, which has the advantages of small thermal expansion coefficient, outstanding heat and hydrolysis resistance, good electrical insulation, etc. The long-term use temperature can reach 260 degrees, and it has excellent self-lubrication. The cover plate is made of metal rust-proof aluminum, which is lighter and more durable than other metal materials.

[0014] Therefore, the paperless hollow filter rod diameter adjustment device can timely adjust the diameter, roundness, circumference and other parameters of the paperless hollow filter rod during high-speed production, thereby improving the production efficiency of the paperless hollow filter rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall assembly structure of the paperless hollow filter rod diameter adjustment device provided by the present invention.

[0016] Figure 2It is a schematic diagram of the overall cross-sectional structure of the paperless hollow filter rod diameter adjustment device provided by the present invention.

[0017] Figure 3 The present invention is a schematic diagram of the matching structure of the lever assembly and the building block in the paperless hollow filter rod diameter adjustment device provided by the present invention.

[0018] Figure 4 It is a schematic diagram of the structure of a lever assembly in the paperless hollow filter rod diameter adjustment device provided by the present invention.

[0019] Figure 5 It is a schematic structural diagram of a floating bearing assembly in a paperless hollow filter rod diameter adjustment device provided by the present invention.

[0020] Figure 6 and Figure 7 The present invention is a schematic diagram of the structure of an adjusting bolt assembly in a paperless hollow filter rod diameter adjusting device.

[0021] Figure 8 and Fig. 9 It is a schematic structural diagram of a fixed bearing assembly in a paperless hollow filter rod diameter adjustment device provided by the present invention.

[0022] Fig.10 It is a schematic structural diagram of a connecting shaft assembly in a paperless hollow filter rod diameter adjustment device provided by the present invention.

[0023] Fig.11 It is a schematic diagram of the sealing body structure in the paperless hollow filter rod diameter adjustment device provided by the present invention.

[0024] In the figure: 1, fixed bearing assembly; 2, floating bearing assembly; 3, adjusting bolt assembly; 4, lever assembly; 5, step block; 6, cover plate; 7, connecting shaft assembly; 8, sealing body; 9, connecting block; 10, adjusting rod; 11, fixed shaft; 12, bumper; 13, elastic pin; 14, first set screw; 15, first sleeve; 16, second set screw; 17, third set screw; 18, first washer; 19, flange sleeve; 20, spacer; 21, first disc spring; 22, flat washer; 23, second sleeve; 24, pressure rod; 25, screw sleeve; 26, end Cover; 27, elastic pin; 28, adjusting screw; 29, first spring; 30, second spring; 31, fourth set screw; 32, first locking nut; 33, positioning sleeve; 34, pressure strip; 35, isolation block; 36, fifth set screw; 37, sixth set screw; 38, second locking nut; 39, first hexagon socket head screw; 40, second washer; 41, third washer; 42, second disc spring; 43, pressure rod; 44, second hexagon socket head screw; 45, cylindrical pin; 46, molded groove; 47, adjustment gap; 48, fixing screw. DETAILED DESCRIPTION

[0025] The technical solution of the present invention is further described in detail below through specific implementation methods.

[0026] Example 1 This embodiment provides a paperless hollow filter rod diameter adjustment device, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 As shown, it comprises a sealing body 8, and a molding pressing groove 46 for adjusting the diameter of the paperless hollow filter rod by means of downward pressure is provided on the lower surface of the sealing body 8.

[0027] It also includes a fixed bearing assembly 1, a floating bearing assembly 2, an adjusting bolt assembly 3, a lever assembly 4, a step block 5, a cover plate 6, and a connecting shaft assembly 7.

[0028] The fixed bearing assembly 1, the floating bearing assembly 2, and the adjusting bolt assembly 3 are respectively arranged on the cover plate 6. The lever assembly 4 and the block 5 are respectively arranged under the cover plate 6. The connecting shaft assembly 7 is respectively connected to the bottom of the fixed bearing assembly 1 and the floating bearing assembly 2 and is coaxial therewith.

[0029] Specifically, the fixed bearing assembly 1 adopts precision fit, the floating bearing assembly 2 adopts clearance fit, and the axes of both fall on the axis of the filter rod. The adjusting bolt assembly 3 adopts a two-stage adjustment method, and its axis also falls on the axis of the filter rod.

[0030] The building block 5 is made of PEEK material, and the cover plate 6 is made of aluminum material.

[0031] like Figure 8 and Fig. 9 As shown, specifically, the fixed bearing assembly 1 is composed of a first sleeve 15 , a second set screw 16 , a third set screw 17 , a first washer 18 , a flange sleeve 19 , a spacer sleeve 20 , a first disc spring 21 , and a flat washer 22 .

[0032] The fixed bearing assembly 1 cannot be moved and adjusted on the X-axis and the Y-axis, but can only be moved in the Z direction, and is used to adjust the diameter of the filter rod during the assembly and debugging stage of the filter rod forming machine.

[0033] like Figure 5As shown, specifically, the floating bearing assembly 2 is composed of a first locking nut 32, a positioning sleeve 33, a pressure strip 34, an isolation block 35, a fifth set screw 36, a sixth set screw 37, a second locking nut 38, a first hexagon socket head screw 39, a second washer 40, a third washer 41, and a second disc spring 42.

[0034] The floating bearing assembly 2 cannot be moved and adjusted on the X axis, but can be moved on the Y axis and the Z axis. It is used for adjustment during the assembly and debugging stage of the filter rod forming machine, and has both filter rod centering adjustment and diameter adjustment functions.

[0035] like Figure 6 and Figure 7 As shown, the adjusting bolt assembly 3 is composed of a second sleeve 23, a first pressure rod 24, a screw sleeve 25, an end cover 26, an elastic pin 27, an adjusting screw 28, a first spring 29, a second spring 30, and a fourth set screw 31. The first pressure rod 24 falls in the middle of the lever assembly 4, and the diameter of the filter rod can be finely adjusted during the production of the filter rod forming machine.

[0036] like Figure 2 , Figure 3 and Figure 4 As shown, specifically, the lever assembly 4 is composed of a connecting block 9, an adjusting rod 10, a fixed shaft 11, a bumper 12, an elastic pin 13, and a first set screw 14. The lever assembly 4 is fixed to the cover plate 6 by the connecting block 9 and the set screw 48.

[0037] The connecting block 9 has an oil-containing bearing built in, and the connecting block 9 is connected to the adjusting rod 10 through a fixed shaft 11. The adjusting rod 10 is provided with the first set screw 14. The relative position of the fixed shaft 11 and the adjusting rod 10, the adjusting rod 10 has an adjustment gap 47 in both the X-axis and Y-axis directions, so that the adjusting rod 10 can rotate around the fixed shaft 11 when the connecting block 9 is fixed.

[0038] like Fig.10 As shown, specifically, the connecting shaft assembly 7 is composed of a second pressure rod 43, a second hexagon socket head screw 44 and a cylindrical pin 45. The upper end of the notch of the second pressure rod 43 adopts a threaded shaft, and the lower end of the notch adopts a cylindrical shaft. The upper end of the notch of the second pressure rod 43 is slightly smaller than the lower end of the notch, so that while ensuring precise positioning, the connecting shaft assembly 7 can be stably screwed into the fixed bearing assembly 1 and the floating bearing assembly 2 for use without interference.

[0039] Specifically, when assembling the paperless hollow filter rod diameter adjustment device provided by the present invention, the specific operating steps are as follows: The flange sleeve 19 is arranged on the cover plate 6 by the third set screw 17. The first washer 18 under the third set screw 17 presses the spacer sleeve 20 and the flange sleeve 19 together. The flange sleeve 19 has two oblong grooves to leave adjustment space for the bumper 12.

[0040] The flange sleeve 19 and the spacer sleeve 20 contain a first disc spring 21 for adjusting the height of the connecting shaft assembly 7, thereby driving the height adjustment of the sealing body 8 to adjust the diameter of the filter rod. There is a conveying line below the sealing body 8 for conveying paperless hollow filter rods.

[0041] The flat washer 22 is placed on the upper end of the first disc spring 21, and the first sleeve 15 is punched with a threaded hole inside to connect the first sleeve 15 to the connecting shaft assembly 7. The second set screw 16 is used to eliminate the thread gap between the connecting shaft assembly 7 and the first sleeve 15 to improve the stability of the filter rod parameters when the machine is running.

[0042] More specifically, the isolation block 35 is placed in the groove of the cover plate 6. The diameter of the large groove at the upper end of the isolation block 35 is slightly larger than the diameter of the second disc spring 42 and the diameter of the positioning sleeve 33. The diameter of the small groove at the lower end of the isolation block 35 is slightly larger than the diameter of the connecting shaft assembly 7, and the difference between the two diameters is equal. This value is the centering adjustment amount of the floating bearing assembly 2.

[0043] The fifth set screw 36 fixes the second locking nut 32 and the connecting shaft assembly 7 together, and a positioning sleeve 33 presses the second disc spring 42 to achieve centering adjustment and diameter adjustment of the filter rod.

[0044] The screw sleeve 25 is fixed on the cover plate 6, and the holes punched are all threaded holes. An end cover 26 is connected above the screw sleeve 25, and a scale line is arranged on the end cover 26.

[0045] The fourth set screw 31 connects the adjusting screw 28 and the second sleeve 23. The second sleeve 23 is also engraved with scale lines, and the hole punched in the center of the adjusting screw 28 is a light hole. The first spring 29 and the second spring 30 are placed in the second sleeve 23 and the screw sleeve 25. The first spring 29 is used to eliminate the thread gap, and the second spring 30 is used to provide downward pressure.

[0046] The axis of the first pressure rod 24 is an optical axis, and an elastic pin 27 is installed on the head to limit the rotation of the first pressure rod 24. When the adjusting screw 28 is screwed into the screw sleeve 25 to press down, since the elastic pin 27 is limited in the cover plate 6, the first pressure rod 24 does not rotate with the rotation of the adjusting screw 28, and has only a downward pressing tendency. The scale lines on the second sleeve 23 and the end cover 26 can show the diameter adjustment amount.

[0047] Specifically, four elastic pins 13 are installed on the side of the lever assembly 4, and gaps are left between the adjusting rods 10. When the adjusting bolt assembly 3 is pressed down, the elastic pins 13 fall on the block 5 to limit the limit position of the lever assembly 4 falling down, and the position between the elastic pins 13 and the fixed shaft 11 is installed with a bumping ball 12 to provide support force for the lever assembly 4 while pressing down the sealing body 8, so as to adjust the diameter of the filter rod.

[0048] Specifically, the holes of the building block 5 through which the screws are inserted are all smooth holes. When the position of the sealing body 8 needs to be adjusted, the building block 5 can be fine-tuned in the X-axis and Y-axis directions.

[0049] Specifically, the specific working principle and adjustment process of the paperless hollow filter rod diameter adjustment device provided by the present invention are as follows: For the fixed bearing assembly: there is a thread hole in the first sleeve 15, and the second set screw 16 fixes the relative position of the first sleeve 15 and the connecting shaft assembly 7. When the first sleeve 15 is slightly rotated downward, the connecting shaft assembly 7 also moves downward under the pressure of the second set screw 16, thereby driving the sealing body to press down to control the diameter of the filter rod. The third set screw 17 and the first washer 18 press the spacer 20 on the flange sleeve 19 to stabilize the position of the first disc spring 21. The first disc spring 21 provides preload to eliminate the thread gap, and the groove on the flange sleeve 19 is used to avoid the position of the bump bead adjustment.

[0050] For the floating bearing assembly: the principle of the diameter adjustment function is similar to that of the fixed bearing assembly, but due to the long total length of the sealing body, errors are inevitable during the production and processing process, resulting in the phenomenon that the double-channel filter rods are not parallel. Therefore, it is necessary to increase the filter rod centering adjustment function. The hole on the pressure strip 34 is an oblong hole, so that the pressure strip 34 can move in the Y-axis direction. The fifth set screw 36 is used to fix the relative position of the first locking nut 32 and the connecting shaft assembly 7.

[0051] When the first locking nut 32 is slightly rotated downward, the connecting shaft assembly 7 also moves downward under the pressure of the fifth set screw 36, thereby driving the sealing body to be pressed downward to control the diameter of the filter rod.

[0052] The outer diameter of the positioning sleeve 33 is slightly smaller than the inner diameter of the upper end of the isolation block 35, and the outer diameter of the connecting shaft assembly 7 is slightly smaller than the inner diameter of the lower end of the isolation block 35. The difference in size is the adjustment range of the floating bearing assembly filter rod alignment. The pressure strip 34 can be moved on the Y axis, and the floating bearing assembly can be adjusted on the Y axis. When the debugging is completed, the four first hexagon socket head screws 39 on the pressure strip are locked, and the four sixth set screws 37 and the second locking nut 38 are used to fix the position of the floating bearing assembly on the Y axis. The groove on the pressure strip is used to avoid the position of the bump bead adjustment.

[0053] Regarding the adjusting bolt assembly: the fixed bearing assembly and the floating bearing assembly have adjusted the filter rod diameter during the assembly and debugging stage. However, during the production process, the filter rod parameters will inevitably fluctuate. The existence of the adjusting bolt assembly can make the adjustment during the production process simpler and faster, shorten the adjustment time, and improve the filter rod production efficiency.

[0054] The fourth set screw 31 fixes the relative position of the adjusting screw 28 and the second sleeve 23. The inner diameter of the lower end of the second sleeve 23 is slightly larger than the outer diameter of the upper end of the screw sleeve, so that the second sleeve 23 can rotate smoothly. The spring provides preload force, eliminates thread clearance, and provides downward pressure.

[0055] The lower end hole of the adjusting screw 28 is a smooth hole. When the adjusting bolt assembly is rotated and pressed down, the pressure rod is pressed down without rotating. This can not only press the lever assembly down, but also avoid rotational friction loss. The elastic pin in the pressure rod is limited by the cover plate, which also limits the rotation of the pressure rod.

[0056] The entire lever assembly is locked under the cover plate, and the adjustment screw is pressed down to drive the lever assembly down. There are scale lines on the sleeve and end cover of the adjustment bolt assembly, so the diameter adjustment size can be observed intuitively. The lever assembly is locked under the cover plate, and the set screws fix the rod and the fixed shaft together. Oil-containing bearings are installed outside the fixed shaft and inside the rod and block, so that the rod can rotate around the fixed shaft without moving the block. The limit of rotation is the distance between the elastic pin and the block. One end of the lever assembly is fixed and the other end rotates, driving the bead to press down. The bead presses down the sealing body, thereby controlling the diameter of the filter rod.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the present invention, which should be included in the scope of the technical solution for protection of the present invention.

Claims

1. A paperless hollow filter rod diameter adjustment device, comprising a sealing body, wherein the lower surface of the sealing body is provided with a forming groove for adjusting the diameter of the paperless hollow filter rod by downward pressure, characterized in that: It also includes a fixed bearing assembly, a floating bearing assembly and an adjusting bolt assembly, wherein the fixed bearing assembly and the floating bearing assembly are respectively adjustable and arranged at two ends of the sealing body; the adjusting bolt assembly is adjustable and arranged above the middle part of the sealing body; The fixed bearing assembly, the floating bearing assembly and the adjusting bolt assembly are respectively used to press down the sealing body by adjusting their own lengths, so as to change the pressure generated by the forming groove on the paperless hollow filter rod.

2. The paperless hollow filter rod diameter adjustment device according to claim 1, characterized in that: The fixed bearing assembly, the floating bearing assembly and the adjusting bolt assembly are respectively connected to the same cover plate, and the floating bearing assembly is adjustably arranged along the width direction of the cover plate.

3. The paperless hollow filter rod diameter adjustment device according to claim 2, characterized in that: The bottom of the adjusting bolt assembly is connected to a lever assembly, and the lever assembly is connected to the lower side of the cover plate. The adjusting bolt assembly is deformed by pressing down the lever assembly, thereby pressing down the two ends of the sealing body.

4. The paperless hollow filter rod diameter adjustment device according to claim 2 or 3, characterized in that: It includes a pair of sealing bodies, a pair of fixed bearing assemblies, a pair of floating bearing assemblies and a pair of adjusting bolt assemblies; A fixed bearing assembly and a floating bearing assembly are respectively arranged at two ends of the same sealing body; A pair of floating bearing assemblies are respectively adjustably arranged along the width direction of the cover plate, and are used to control the parallelism between the pair of sealing bodies.

5. The paperless hollow filter rod diameter adjustment device according to claim 4, characterized in that: The symmetric axes of a pair of the fixed bearing assemblies, the symmetric axes of a pair of the floating bearing assemblies, and the symmetric axes of a pair of the adjusting bolt assemblies are respectively parallel to the axis of the paperless hollow filter rod.

6. The paperless hollow filter rod diameter adjustment device according to claim 3, characterized in that: The lever assembly includes a connecting block, an adjusting rod, a fixed shaft, a contact ball, an elastic pin, and a bridge block; The connecting block and the building block are respectively connected to the lower surface of the cover plate; The two ends of the adjusting rod are rotatably connected to the connecting block through the fixed shaft, and the middle of the adjusting rod is provided with an adjusting gap that can move up and down and forward and backward; The side of the adjusting rod is provided with the elastic pin used in conjunction with the block, and the block is distributed on one side of the adjusting rod and is used to limit the deformation of the elastic pin; The bumping balls are arranged at both ends of the adjusting rod, and the lower ends of the bumping balls are in contact with the upper surface of the sealing body; The adjusting bolt assembly deforms the adjusting rod by pressing down the adjusting gap, and then presses down the two ends of the sealing body symmetrically through the bumping balls at the two ends.

7. The paperless hollow filter rod diameter adjustment device according to claim 6, characterized in that: The lower end of the fixed bearing assembly and the lower end of the floating bearing assembly are respectively connected with a connecting shaft assembly, and the interior of the fixed bearing assembly and the interior of the floating bearing assembly are respectively provided with elastic elements; The upper ends of the connecting shaft assemblies are in contact with the elastic elements respectively, and the lower ends of the connecting shaft assemblies are connected to the sealing body; The fixed bearing assembly and the floating bearing assembly generate downward pressure on the connecting shaft assembly by changing the deformation amount of the elastic element, thereby pressing down the sealing body.

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