Papermaking felt base web preforming apparatus

Abstract

The utility model relates to the technical field of the heating setting of fabric, specifically relates to papermaking blanket bottom net pre-setting equipment. Papermaking blanket bottom net pre-setting equipment, including from front to back in proper order arrangement's unwinding mechanism, unwinding pinch roll group, heating unit, winding pinch roll group and winding mechanism, unwinding mechanism is used for placing the bottom net of the roll shape, and unwinding pinch roll group is used for clamping and will the bottom net transport backward, heating unit is used for the bottom net with the set process temperature and carries out heating and sets, winding pinch roll group carries out the uniform stretching to the bottom net with the set tension, and winding mechanism is used for winding the bottom net after heat setting. The utility model can save the floor space, and improves the setting efficiency.

Description

Technical Field

[0001] This utility model relates to the field of heat setting technology for fabrics, specifically to a pre-setting device for papermaking blanket bottom mesh. Background Technology

[0002] As the basic structure of papermaking felt, the bottom net directly affects the quality of the final papermaking felt due to its dimensional stability and structural strength.

[0003] Heat setting is a crucial step in the manufacturing process of the wire mesh. During weaving, the synthetic fiber yarns are stretched, bent, and twisted, generating residual stress. When the papermaking felt encounters high temperatures and humidity on the paper machine, this internal stress is released, causing the wire mesh to shrink or deform uncontrollably. The purpose of heat setting is to allow the polymer molecular chains in the yarn to gain sufficient mobility under controlled temperature and tension conditions, rearranging and relaxing the internal stress generated during weaving. Simultaneously, the mesh structure (the interlacing points of the warp and weft yarns) is fixed at high temperatures; this more stable structural state is then maintained through cooling. After heat setting, the wire mesh exhibits extremely stable dimensions, a robust and uniform structure, a smooth and wear-resistant surface, optimized mechanical properties, and improved heat resistance, meeting the stringent operating environment requirements of high-speed, high-pressure, high-temperature, and high-humidity papermaking machines.

[0004] Traditional heat-setting of the base mesh involves a two-roller method. The entire length of the base mesh is connected end-to-end into a loop and wound around two rollers. One roller is stationary, while the other is a movable roller that can move linearly. The stationary roller can be a heated roller, or a hot air box can be installed near it. During the movement of the movable roller, the base mesh is stretched evenly to ensure uniform and stable tension during heat setting. However, this two-roller method has drawbacks. Because the base mesh is looped, the distance between the movable and stationary rollers must be at least half the length of the base mesh to be set. This can be very space-consuming when the base mesh is too long. Furthermore, after heat setting, the base mesh needs to be removed from both the stationary and movable rollers before a new base mesh is wound on, leading to equipment downtime, discontinuous heat setting, and reduced subsequent production efficiency. Utility Model Content

[0005] The purpose of this utility model is to provide a pre-setting device for the bottom wire of papermaking felt, so as to solve the technical problems of existing two-roll heat setting equipment having large space occupation and discontinuous setting.

[0006] To solve the above problems, the papermaking felt bottom wire pre-forming device provided by this utility model adopts the following technical solution:

[0007] A papermaking felt bottom wire pre-forming device includes an unwinding mechanism, an unwinding clamping roller group, a heating unit, a rewinding clamping roller group, and a rewinding mechanism arranged sequentially from front to back.

[0008] The unwinding mechanism is used to hold the rolled-up bottom netting;

[0009] The unwinding and pinching roller group is used to clamp and convey the bottom net backward;

[0010] The heating unit is used to heat and shape the bottom mesh at a set process temperature;

[0011] The take-up pinch roller assembly stretches the bottom net uniformly with a set tension.

[0012] The winding mechanism is used to wind up the heat-set bottom mesh.

[0013] The beneficial effects of this papermaking felt bottom wire pre-forming equipment are as follows: This invention unwinds the rolled bottom wire using an unwinding mechanism, then provides stable and uniform stretching and conveying through unwinding and rewinding pinch roller groups. Under the action of a heating unit, the bottom wire is uniformly heated for heat setting, and finally, it is rewound. Compared to the traditional two-roller setting method, this invention eliminates the need to wind the bottom wire into a loop. Instead, the rolled bottom wire is directly placed on the unwinding mechanism, clamped, conveyed, and stretched by two pinch roller groups, and finally wound into a roll. This makes operation more convenient. Furthermore, the arrangement of the unwinding mechanism, unwinding pinch roller group, heating unit, rewinding pinch roller group, and rewinding mechanism in the bottom wire conveying direction can be more compact, thus greatly reducing the space occupied by the entire equipment in the bottom wire conveying direction. In addition, as long as there is a bottom wire on the unwinding mechanism, continuous heat setting of the bottom wire can be achieved, and the installation of the rolled bottom wire is more convenient. Compared with the traditional two-roll setting method, the papermaking felt bottom wire pre-setting equipment of this utility model can achieve continuous setting of the bottom wire, which greatly improves production efficiency.

[0014] Furthermore, the heating unit includes a heating bracket, an electrically heated roller rotatably mounted on the heating bracket, a force-measuring roller movably mounted on the heating bracket, and a pressure sensor mounted on the heating bracket. The axes of the electrically heated roller and the force-measuring roller both extend in the left-right direction. The electrically heated roller has a heat transfer fluid flow cavity and an electrically heated device for heating the heat transfer fluid. The bottom mesh passes around the electrically heated roller for heat setting. The force-measuring roller is located between the electrically heated roller and the take-up pinch roller group. The friction between the bottom mesh and the force-measuring roller drives the force-measuring roller to slide on the heating bracket. The force-measuring roller contacts the pressure sensor, and the conveying speed of the unwinding pinch roller group and the take-up pinch roller group is adjusted by the detection signal of the pressure sensor.

[0015] Beneficial effects: The pressure sensor can monitor the tension of the bottom mesh in real time, enabling dynamic adjustment of the conveying speed of the unwinding and rewinding pinch roll groups, ensuring that the bottom mesh is stretched stably and evenly; the electric heating roller has higher thermal efficiency and lower energy consumption, as well as more precise and uniform temperature control, and direct contact with the bottom mesh ensures stable and reliable heat transfer; in addition, the electric heating roller has faster heating and response speed, better product quality and process effect, lower maintenance requirements and operating noise.

[0016] Furthermore, a slitting mechanism is provided between the winding and feeding roller group and the winding mechanism. The slitting mechanism is used to cut the rough edges on the left and right sides of the bottom net.

[0017] Beneficial effects: The rough edges are unstable in size and irregular in shape. After being cut by the slitting mechanism, they can meet the high-precision requirements of the papermaking machine for the dimensions of the formed paper felt. The pre-fabricated equipment integrates a slitting mechanism, which cuts and removes the rough edges before the bottom wire enters the next processing step, improving subsequent production efficiency.

[0018] Furthermore, the slitting mechanism includes at least three sets of cutting devices arranged at intervals in the left-right direction. The two outermost cutting devices are used to cut off the rough edges on the left and right sides of the bottom mesh, respectively, and the inner cutting device is used to cut the bottom mesh into at least two sets of the same or different widths. The winding mechanism is arranged at least two sets at intervals in the front-back direction. Each set of winding mechanisms is staggered in the left-right direction, and the number of winding mechanisms is one less than the number of cutting devices.

[0019] Beneficial effects: The slitting mechanism can divide the base mesh into at least two base meshes of the same or different widths. At the same time, the slitting base meshes are wound up by a corresponding number of winding mechanisms, which can meet the processing needs of base meshes of different widths or single widths.

[0020] Furthermore, the winding mechanism includes a drive-end winding bracket, a driven-end winding bracket, and a winding mandrel that is detachably locked between the two winding brackets and can rotate, with the axis of the winding mandrel extending in the left-right direction; the distance between the drive-end winding bracket and the driven-end winding bracket in at least one set of winding mechanisms is adjustable in the left-right direction.

[0021] Beneficial effects: By adjusting the distance between the drive end winding bracket and the driven end winding bracket in the left and right directions, winding mandrels of different lengths can be selected, thereby meeting the winding requirements for different widths of bottom nets.

[0022] Furthermore, at least the distance between two adjacent sets of cutting devices in the left-right direction is adjustable.

[0023] Beneficial effect: It can cut the bottom mesh into different widths.

[0024] Furthermore, the unwinding pinch roller assembly and the rewinding pinch roller assembly have the same structure, each including a mounting frame, an upper drive roller, an upper drive motor, a lower drive roller, a lower drive motor, a tensioning roller, and a tensioning cylinder. The axes of the upper drive roller, the lower drive roller, and the tensioning roller are parallel to each other and extend in the left-right direction, while the three axes are staggered in the front-back direction. The upper drive roller and the lower drive roller are rotatably mounted on the mounting frame. The upper drive motor is driven by the upper drive roller, and the lower drive motor is driven by the lower drive roller. The tensioning roller is movably mounted on the mounting frame in a direction perpendicular to its axis. The output end of the tensioning cylinder is connected to the tensioning roller, and the tensioning roller can be tangent to both the upper drive roller and the lower drive roller simultaneously during its active stroke.

[0025] Beneficial effects: Only one set of clamping rollers needs to be designed, which is convenient for manufacturing and processing and saves design costs; the bottom net can be stably clamped and conveyed and stretched evenly through the upper drive roller, tension roller and lower drive roller.

[0026] Furthermore, the mounting frame of the unwinding pinch roll assembly is also equipped with two sets of flattening roll assemblies arranged at left and right intervals. Each set of flattening roll assemblies includes two flattening pinch rolls arranged opposite each other in the front-back direction. The axis of the flattening pinch rolls extends in the left-right direction, and a flattening gap is formed between the two flattening pinch rolls for the bottom net to pass through.

[0027] Beneficial effect: When the bottom mesh, which is held and conveyed by the unwinding pinch roller group, passes through the flattening pinch roller, the surface of the bottom mesh becomes flatter.

[0028] Furthermore, the unwinding mechanism includes a drive-end unwinding bracket, a driven-end unwinding bracket, and a rotatable unwinding mandrel that is detachably locked between the two unwinding brackets. The axis of the unwinding mandrel extends in the left-right direction. The unwinding mandrel is used to hold the rolled-up base net. The distance between the drive-end unwinding bracket and the driven-end unwinding bracket in the left-right direction is adjustable. The distance between the two sets of flattening rollers on the mounting frame in the left-right direction is also adjustable.

[0029] Beneficial effects: It can unwind and flatten bottom nets of different widths, improving the versatility of the entire pre-designed equipment. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural diagram of the pre-formed papermaking felt bottom netting device of this utility model.

[0031] Figure 2 for Figure 1 The main view;

[0032] Figure 3 This is a schematic diagram of the working process of the papermaking felt bottom wire pre-formation equipment of this utility model;

[0033] Figure 4 for Figure 1 A three-dimensional structural diagram of the unwinding mechanism;

[0034] Figure 5 for Figure 4 Side view;

[0035] Figure 6 for Figure 1 A three-dimensional structural diagram of the unwinding pinch roll assembly;

[0036] Figure 7 for Figure 6 Side view;

[0037] Figure 8 for Figure 1 A three-dimensional structural diagram of the central heating unit from a first-person perspective;

[0038] Figure 9 for Figure 1 A three-dimensional structural diagram of the heating unit from a second perspective;

[0039] Figure 10 for Figure 2 Enlarged view of point A in the middle;

[0040] Figure 11 for Figure 1 A three-dimensional structural diagram of the unwinding pinch roll assembly;

[0041] Figure 12 for Figure 1 A three-dimensional structural diagram of the splitting mechanism;

[0042] Figure 13 for Figure 1 A three-dimensional structural diagram of the in-vehicle winding mechanism;

[0043] Figure 14 for Figure 1 A three-dimensional structural diagram of the fixed winding mechanism.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Unwinding mechanism; 2. Unwinding pinch roller assembly; 3. Heating unit; 4. Rewinding pinch roller assembly; 5. Slitting mechanism; 6. Movable rewinding mechanism; 7. Fixed rewinding mechanism; 8. Base wire; 9. First operating platform; 10. Flattening roller assembly; 11. Rough edge rewinding mechanism; 12. Second operating platform; 14. Tension detection roller; 15. Second guide roller; 16. First guide roller; 17. Unwinding base frame; 18. Driven end unwinding bracket; 19. Driven end unwinding bracket; 20. Unwinding mandrel; 21. Unwinding roller frame; 22. Unwinding locking structure; 23. Unwinding mounting frame; 24. Unwinding upper drive roller; 25. Unwinding lower drive roller; 26. Unwinding upper drive motor; 27. Unwinding lower drive motor; 28. Unwinding tension roller; 29. ​​Unwinding tension cylinder; 30. Slide; 1. Mounting port; 32. Flattening clamping roller; 33. Heating bracket; 34. Electric heating roller; 35. Force measuring roller; 36. Pressure sensor; 37. Expansion groove; 38. Metal hose; 39. Non-contact infrared thermometer; 40. Rewinding mounting frame; 41. Upper rewinding drive roller; 42. Lower rewinding drive roller; 43. Upper rewinding drive motor; 44. Lower rewinding drive motor; 45. Rewinding tensioning roller; 46. Rewinding tensioning cylinder; 47. Slitting bracket; 48. Cutting device; 49. Frame track; 50. Rewinding base frame; 51. First drive end rewinding bracket; 52. First driven end rewinding bracket; 53. First rewinding mandrel; 54. First rewinding roller frame; 55. Second drive end rewinding bracket; 56. Second driven end rewinding bracket; 57. Second rewinding mandrel. Detailed Implementation

[0046] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0047] An embodiment of the pre-forming device for the bottom screen of papermaking felt provided by this utility model:

[0048] like Figure 1 , Figure 2 and Figure 3 As shown, a papermaking felt bottom wire pre-forming device includes, from front to back, an unwinding mechanism 1, an unwinding clamping roller group 2, a heating unit 3, a rewinding clamping roller group 4, a slitting mechanism 5, a movable rewinding mechanism 6, and a fixed rewinding mechanism 7. A first operating platform 9 is installed between the unwinding mechanism 1 and the unwinding clamping roller group 2, and a tension detection roller 14 is installed on the front side below the first operating platform 9; a second operating platform is installed between the rewinding clamping roller group 4 and the slitting mechanism 5; a second operating platform 12 is installed between the movable rewinding mechanism 6 and the fixed rewinding mechanism 7, and a first guide roller 16 is installed on the rear side below the second operating platform 12.

[0049] Specifically, such as Figure 4 and Figure 5As shown, the unwinding mechanism 1 includes an unwinding base frame 17, a drive-end unwinding bracket 18 and a driven-end unwinding bracket 19 arranged on the unwinding base frame 17 at left and right intervals, and a rotatable unwinding mandrel 20 that is detachably locked between the two unwinding brackets. The unwinding base frame 17 is a channel steel guide rail frame extending in the left and right direction. The bottom of both the drive-end unwinding bracket 18 and the driven-end unwinding bracket 19 is provided with four rectangularly distributed pulleys. The pulleys can slide in the track groove of the channel steel guide rail frame, thereby adjusting the distance between the drive-end unwinding bracket 18 and the driven-end unwinding bracket 19 in the left and right direction according to the width requirements of the bottom net 8. The drive-end unwinding bracket 18 and the driven-end unwinding bracket 19 are both provided with a common unwinding locking structure 22 that is locked to the unwinding base frame 17 by bolts and pressure plates, so as to fix the two unwinding brackets after the positions of the two unwinding brackets are adjusted.

[0050] A motor mount is installed on the drive-end unwinding bracket 18. A helical gear reducer directly connected to a servo motor is mounted on the motor mount. A three-jaw chuck is installed on the output shaft of the helical gear reducer to lock the unwinding mandrel 20 and also to allow for the removal and replacement of the unwinding mandrel 20. A screw-nut transmission mechanism via a handwheel is provided between the drive-end bracket and the motor mount to finely adjust the position of the motor mount in the left-right direction. Unwinding roller frames 21 are also provided on the drive-end unwinding bracket 18 and the driven-end unwinding bracket 19. Unwinding rollers that rotatably contact the unwinding mandrel 20 are mounted on the unwinding roller frame 21 along an axis extending in the left-right direction. The driven end does not constrain the unwinding mandrel 20. The unwinding mandrel 20 is used to hold the rolled-up bottom net 8. The tension detection roller 14 is coated with a Dacromet heat-resistant coating, and two sets of tension sensors are provided to detect tension.

[0051] like Figure 6 As shown, the unwinding pinch roller assembly 2 is used to clamp and convey the bottom net 8 backwards. It includes an unwinding mounting frame 23, an upper unwinding drive roller 24, an upper unwinding drive motor 26, a lower unwinding drive roller 25, a lower unwinding drive motor 27, an unwinding tension roller 28, and an unwinding tension cylinder 29. The upper unwinding drive roller 24 and the lower unwinding drive roller 25 are rotatably mounted on the unwinding mounting frame 23. The upper unwinding drive motor 26 and the lower unwinding drive motor 27 are both AC servo brake motors, each driving the upper unwinding drive roller 24 and the lower unwinding drive roller 25 to rotate via their respective directly connected reducers. The axes of the upper unwinding drive roller 24, the lower unwinding drive roller 25, and the unwinding tension roller 28 are parallel to each other and extend in the left-right direction. The upper unwinding drive roller 24, the lower unwinding drive roller 25, and the unwinding tension roller 28 are arranged alternately in the front-back direction. Figure 7As shown, an installation port 31 is provided on each of the left and right sides of the unwinding mounting frame 23. A slide block 30 is connected to each of the left and right ends of the unwinding tension roller 28. The output end of the unwinding tension cylinder 29 is connected to the slide block 30, thereby driving the slide block 30 to move in the installation port 31 along an axis perpendicular to the unwinding tension roller 28. Correspondingly, the slide block 30 also drives the unwinding tension roller 28 to move, facilitating the winding and clamping of the bottom net 8. The outer diameters of the unwinding tension roller 28, the upper unwinding drive roller 24, and the lower unwinding drive roller 25 are equal. During the process of the unwinding tension cylinder 29 driving the unwinding tension roller 28 to move, the unwinding tension roller 28 can be simultaneously tangent to the upper unwinding drive roller 24 and the lower unwinding drive roller 25, thereby achieving the clamping of the bottom net 8.

[0052] like Figure 11 As shown, the take-up pinch roller assembly 4 is used to uniformly stretch and convey the base mesh 8, and includes a take-up mounting frame 40, an upper take-up drive roller 41, an upper take-up drive motor 43, a lower take-up drive roller 42, a lower take-up drive motor 44, a take-up tension roller 45, and a take-up tension cylinder 46. The structure of the take-up pinch roller assembly 4 is the same as that of the unwinding pinch roller assembly 2 described above, and will not be described in detail here.

[0053] like Figure 2 and Figure 3 As shown, two sets of flattening roller groups 10 are also installed on the mounting frame of the unwinding pinch roller group 2, arranged at left and right intervals. The mounting frame is equipped with two sets of guide rails extending in the left and right directions and roller seats that slide with the guide rails. Each flattening roller group 10 includes two flattening clamping rollers 32 arranged opposite each other in the front-back direction and rotatably mounted on the roller seat. The axes of the flattening clamping rollers 32 extend in the left and right directions, and a flattening gap is formed between the two flattening clamping rollers 32 to allow the bottom mesh 8 to pass through, thus flattening the surface of the bottom mesh 8. When the roller seat slides on the guide rails, the distance between the two sets of flattening roller groups 10 in the left and right directions can be adjusted to match bottom meshes 8 of different widths.

[0054] In this embodiment, the heating unit 3 heats and shapes the bottom mesh 8 at a set process temperature. For example... Figure 8 and Figure 9As shown, the heating unit 3 includes a heating bracket 33, an electric heating roller 34, a force measuring roller 35, and a pressure sensor 36. The electric heating roller 34 is rotatably mounted to the heating bracket 33 and is driven to rotate by an AC servo motor directly coupled to a reducer. The force measuring roller 35 is located between the electric heating roller 34 and the take-up pinch roller group 4. Both ends of the force measuring roller 35 are movably mounted to the heating bracket 33 via bearing seats, and pressure sensors 36 for detecting tension are installed on the bearing seats at both ends. During the conveying process of the bottom net 8, the friction force drives the force measuring roller 35 to move on the heating bracket 33, causing the bearing seats at both ends of the force measuring roller 35 to contact the pressure sensor 36. This allows the pressure sensor 36 to monitor tension data in real time. By monitoring the signal from the pressure sensor 36, the different driving speeds of the take-up pinch roller group 4 and the unwinding pinch roller group 2 are adjusted in real time for tension control. Both the electric heating roller 34 and the force measuring roller 35 extend along the left-right direction. The electric heating roller 34 is existing technology and features a sandwich structure with a 100mm spacing. Six sets of flange-type heating tubes are evenly distributed circumferentially between the layers. It has an internal heat transfer fluid flow chamber containing heat transfer oil. When energized, the flange-type heating tubes heat the heat transfer oil, ensuring uniform temperature across the roller surface. The shaft end on the drive side of the electric heating roller 34 is equipped with a support bearing seat, a power supply slip ring, and a transmission gear. The shaft end on the driven side is equipped with a support bearing seat and a rotary joint. The driven side shaft end can freely extend and retract to dissipate roller thermal expansion. The rotary joint is connected to an expansion tank 37 via a metal hose 38. The expansion tank 37 is made of stainless steel and has sufficient volume to accommodate changes in the heat transfer oil volume. It is equipped with venting and oil filling ports, and a magnetic level gauge with remote alarm is installed on its side. A non-contact infrared thermometer 39 is fixed to one side of the expansion groove 37 by a fixing rod, which is used to monitor the temperature of the surface of the electric heating roller 34.

[0055] like Figure 2 and Figure 3 As shown, a slitting mechanism 5 is provided between the take-up pinch roller group 4 and the movable take-up mechanism 6. In this embodiment, as... Figure 12As shown, the slitting mechanism 5 includes a slitting bracket 47, on which a frame rail 49 extending in the left-right direction is provided. Three sets of spaced-apart cutting devices 48 are mounted on the frame rail 49. The cutting devices 48 are common ultrasonic cutting devices in the prior art, employing a wheel-type rotating cutting head. The cutting devices 48 are slidably mounted on the frame rail 49 via sliders, allowing for adjustment of their left-right positions. The two outermost cutting devices 48 are used to remove the rough edges on the left and right sides of the base mesh 8, while the middle cutting device 48 slits the base mesh 8, dividing the original single base mesh 8 into two sheets. During slitting, the fusion at the cutting point simultaneously seals the mesh edges, preventing burrs from forming on the edges of the base mesh 8. The width of the two base meshes 8 can be selected according to the user's needs. If a single width of base mesh 8 is required, the three sets of cutting devices 48 can be adjusted to have equal spacing between each pair; if two different widths of base mesh 8 are required, the spacing between adjacent sets of cutting devices 48 can be adjusted according to the required width. To ensure the flatness of the bottom mesh 8 at the slitting position, a second guide roller 16 is installed on the rear side of the slitting bracket 47.

[0056] like Figure 13 As shown, the movable winding mechanism 6 includes a winding base frame 50, a first drive-end winding bracket 51, a first driven-end winding bracket 52, and a first winding mandrel 53. The winding base frame 50 also uses a channel steel guide rail frame. The bottom of both the first drive-end winding bracket 51 and the first driven-end winding bracket 52 is equipped with four rectangularly distributed pulleys. These pulleys can slide in the channel steel rail grooves on the winding base frame 50, thereby adjusting the distance between the first drive-end winding bracket 51 and the first driven-end winding bracket 52 in the left-right direction to accommodate the winding requirements of different widths of the bottom mesh 8. A helical gear reducer directly connected to a servo motor is installed on the first drive-end winding bracket 51. A three-jaw chuck is installed on the output shaft of the reducer to lock the first winding mandrel 53 and simultaneously allow for the replacement of the first winding mandrel 53. The first drive end winding bracket 51 and the first driven end winding bracket 52 are also provided with a first winding roller frame 54. The structure of the first winding roller frame 54 is the same as that of the unwinding roller frame 21. The first winding roller frame 54 on the first driven end winding bracket 52 does not constrain the first winding mandrel 53.

[0057] A set of rough edge winding mechanisms 11 is provided on the winding base frame 50 near the first driven end winding bracket 52 and the first transmission end winding bracket 51 to wind up the rough edges cut off on the left and right sides of the bottom mesh 8, respectively. The rough edge winding mechanism 11 winds up the rough edges by driving the tile-type air expansion shaft with a speed-regulating right-angle geared motor.

[0058] like Figure 14As shown, the fixed winding mechanism 7 includes a second drive-end winding bracket 55, a second driven-end winding bracket 56, and a second winding mandrel 57. The difference between the second drive-end winding bracket 55 and the first drive-end winding bracket 51 is that the second drive-end winding bracket 55 has no pulley at its bottom and its position is fixed. The difference between the second driven-end winding bracket 56 and the first driven-end winding bracket 52 is that the second driven-end winding bracket 56 has no pulley at its bottom and its position is also fixed. The remaining structure will not be described in detail. Since the distance between the second drive-end winding bracket 55 and the second driven-end winding bracket 56 is fixed, the length of the second winding mandrel 57 is fixed, and it is used to wind up the bottom net 8 of a specific width.

[0059] It should be noted that the papermaking felt bottom wire pre-forming equipment is also equipped with an electrical control system. This control system is built using an Omron PLC and allows for parameter settings and modifications, the issuance of on-site control commands, and the display of system operating status via an HMI color touchscreen. The electrical control system is used for controlling functions such as speed (tension), temperature, slitting, and winding during the bottom wire 8 pre-forming process.

[0060] The working process of the papermaking felt bottom wire pre-forming device of this utility model:

[0061] The rolled-up base mesh 8 is fitted onto the unwinding mandrel 20, and the base mesh 8 sequentially passes over the tension detection roller 14, the unwinding lower drive roller 25, the unwinding tension roller 28, the unwinding upper drive roller 24, the flattening gap, the electric heating roller 34, the force measuring roller 35, the winding upper drive roller 41, the winding tension roller 45, the winding lower drive roller 42, the second guide roller 15 / first guide roller 16, and the first winding mandrel 53 / second winding mandrel 57. During operation, the unwinding pinch roller group 2 is used to clamp and convey the base mesh 8 backward, the heating unit 3 heats the base mesh 8 at a set process temperature for shaping, the winding pinch roller group 4 stretches the base mesh 8 evenly at a set tension, the slitting mechanism 5 removes the rough edges on the left and right sides of the base mesh 8 and cuts the base mesh 8 into two sheets, and the first winding mandrel 53 and the second winding mandrel 57 respectively perform winding. It should also be noted that in actual production, only the movable winding mechanism 6 can be used, depending on the requirement of an 8-width bottom wire mesh.

[0062] Traditional two-roller setting equipment requires winding the entire length of the base mesh 8 into a loop on two rollers, necessitating at least half the length of the base mesh 8 in the factory for installation. Furthermore, after setting, the long loop of base mesh 8 needs to be removed from the rollers, making the operation cumbersome. In this application, the rolled base mesh 8 is directly heat-set using an electrically heated roller 34 before being wound up. This method avoids winding the base mesh 8 into a loop, thus eliminating the need for a large installation space. Additionally, the continuous unwinding of the base mesh 8 enables continuous setting, resulting in higher setting efficiency.

[0063] In other embodiments, if the customer only needs one width, only one winding mechanism can be used. Of course, if the factory has sufficient longitudinal space and the customer needs multiple different widths, three or more winding mechanisms can be set up. When multiple winding mechanisms are set up, they are arranged at intervals in the front-to-back direction and staggered in the left-to-right direction; in this case, one more cutting device than the winding mechanism is required.

[0064] In other embodiments, if the required width of the bottom mesh is unique, the distance between the unwinding bracket at the drive end and the unwinding bracket at the driven end in the left and right directions is fixed, and the distance between the two sets of flattening rollers in the left and right directions is fixed; in this case, only the rough edges on both sides of the bottom mesh can be cut.

[0065] In other embodiments, a slitting mechanism may not be required, and the bottom mesh can be directly wound up after heat setting. In this case, only one winding mechanism is needed.

[0066] In other embodiments, other heating units may also be used, such as using a hot air box instead of an electric heating roller to heat and shape the bottom mesh, or using an oil heating roller instead of an electric heating roller. The oil heating roller is directly filled with heat-conducting oil with a set process temperature, without the need for an additional device to heat the heat-conducting oil.

[0067] Based on the above description in this specification, those skilled in the art will also understand that terms used, such as "upper," "lower," "front," "rear," "left," "right," "bottom," "inner," and "outer," which indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0068] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A pre-forming device for papermaking felt bottom net, characterized in that, It includes an unwinding mechanism, an unwinding pinch roller group, a heating unit, a winding pinch roller group, and a winding mechanism arranged sequentially from front to back; The unwinding mechanism is used to hold the rolled-up bottom netting; The unwinding and pinching roller group is used to clamp and convey the bottom net backward; The heating unit heats and shapes the base mesh at a set process temperature. The heating unit includes a heating bracket, an electrically heated roller rotatably mounted on the heating bracket, a force-measuring roller movably mounted on the heating bracket, and a pressure sensor mounted on the heating bracket. The axes of the electrically heated roller and the force-measuring roller both extend in the left-right direction. The electrically heated roller has a heat transfer fluid flow chamber and an electrically heated device for heating the heat transfer fluid. The base mesh passes around the electrically heated roller for heat shaping. The force-measuring roller is located between the electrically heated roller and the take-up pinch roller group. The friction between the base mesh and the force-measuring roller drives the force-measuring roller to slide on the heating bracket. The force-measuring roller contacts the pressure sensor, and the conveying speed of the unwinding pinch roller group and the take-up pinch roller group is adjusted by the detection signal from the pressure sensor. The take-up pinch roller assembly stretches the bottom net uniformly with a set tension. The winding mechanism is used to wind up the heat-set bottom mesh.

2. The papermaking felt bottom wire pre-forming device according to claim 1, characterized in that, A slitting mechanism is provided between the winding clamping roller group and the winding mechanism. The slitting mechanism is used to cut the rough edges on the left and right sides of the bottom net.

3. The papermaking felt bottom wire pre-forming device according to claim 2, characterized in that, The slitting mechanism includes at least three sets of cutting devices arranged at intervals in the left-right direction. The two outermost cutting devices are used to cut off the rough edges on the left and right sides of the bottom mesh, respectively, and the inner cutting device is used to cut the bottom mesh into at least two sets of the same or different widths. The winding mechanism is arranged at least two sets at intervals in the front-back direction. Each set of winding mechanisms is staggered in the left-right direction, and the number of winding mechanisms is one less than the number of cutting devices.

4. The papermaking felt bottom wire pre-forming device according to claim 3, characterized in that, The winding mechanism includes a drive-end winding bracket, a driven-end winding bracket, and a winding mandrel that is detachably locked between the two winding brackets and can rotate, with the axis of the winding mandrel extending in the left-right direction; the distance between the drive-end winding bracket and the driven-end winding bracket in at least one set of winding mechanisms is adjustable in the left-right direction.

5. The papermaking felt bottom wire pre-forming device according to claim 4, characterized in that, At least the distance between two adjacent sets of cutting devices in the left-right direction is adjustable.

6. The papermaking felt bottom wire pre-forming device according to any one of claims 1-5, characterized in that, The unwinding and rewinding pinch roller assemblies have the same structure, each including a mounting frame, an upper drive roller, an upper drive motor, a lower drive roller, a lower drive motor, a tensioning roller, and a tensioning cylinder. The axes of the upper drive roller, the lower drive roller, and the tensioning roller are parallel to each other and extend in the left-right direction, while the three axes are staggered in the front-back direction. The upper and lower drive rollers are rotatably mounted on the mounting frame. The upper drive motor is driven by the upper drive roller, and the lower drive motor is driven by the lower drive roller. The tensioning roller is movably mounted on the mounting frame in a direction perpendicular to its axis. The output end of the tensioning cylinder is connected to the tensioning roller, and the tensioning roller can be tangent to both the upper and lower drive rollers simultaneously during its stroke.

7. The papermaking felt bottom wire pre-forming device according to claim 6, characterized in that, The mounting frame of the unwinding pinch roll assembly is also equipped with two sets of flattening rolls arranged at intervals on the left and right. Each set of flattening rolls includes two flattening pinch rolls arranged opposite each other in the front-back direction. The axis of the flattening pinch rolls extends in the left-right direction, and a flattening gap is formed between the two flattening pinch rolls to allow the bottom net to pass through.

8. The papermaking felt bottom wire pre-forming device according to claim 6, characterized in that, The unwinding mechanism includes a drive-end unwinding bracket, a driven-end unwinding bracket, and a rotatable unwinding mandrel that is detachably locked between the two unwinding brackets. The axis of the unwinding mandrel extends in the left-right direction. The unwinding mandrel is used to hold the rolled-up base net. The distance between the drive-end unwinding bracket and the driven-end unwinding bracket in the left-right direction is adjustable. The distance between the two sets of flattening rollers on the mounting frame in the left-right direction is also adjustable.

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