A vacuum suction material device for calendering auxiliary agent production

Abstract

The utility model relates to a kind of vacuum suction material device for calendering auxiliary agent production, including with the suction material device main body of communicating with negative pressure source and with the suction material device main body connection suction pipeline, suction pipeline at least includes the inner layer of forming suction passageway and the outer layer of being oppositely arranged with inner layer, the interlayer cleaning track of being sealed at both ends and extending along pipeline axial direction is formed between inner layer and outer layer;At least one cleaning member that can be guided in interlayer cleaning track is arranged, cleaning member is isolated with suction passageway and is correspondingly arranged with the facing area of inner layer;Outer layer is provided with driving member, driving member drives cleaning member reciprocating motion along interlayer cleaning track in non-contact mode;And inner layer is provided with disturbance transmission structure in facing area, for at least one of mechanical impact, vibration or field-induced vibration generated in interlayer cleaning track is coupled to inner wall of inner layer under the condition of keeping to suction passageway sealed isolation.

Description

TECHNICAL FIELD

[0001] The utility model relates to vacuum suction equipment technical field especially is related to a vacuum suction device for production of calendering auxiliary agent. BACKGROUND

[0002] In the field of rubber, plastic and other material processing, calendering auxiliary agent is widely used as functional additive to improve the processing performance of materials and the quality of products. Common calendering auxiliary agents include lubricants, dispersants, fillers, anti-adhesion agents, etc., which mostly exist in the form of powder, have the characteristics of fine particles, easy moisture absorption and poor fluidity. In order to realize automatic, closed and efficient raw material feeding, vacuum suction devices are usually used in production systems to transport powder calendering auxiliary agent from the raw material container to the storage tank or stirring tank.

[0003] The existing vacuum suction device is widely used in conventional powder conveying, but it has many shortcomings when dealing with powder calendering auxiliary agent. Because the auxiliary agent powder has strong moisture absorption and certain adhesion, it is easy to form an adherent layer on the inner wall of the suction pipe and gradually clog, causing pipe blockage, insufficient vacuum pressure and suction failure. The current system generally lacks online automatic cleaning structure, and frequent manual disassembly and cleaning of the hose or replacement of the pipeline seriously affect the efficiency of the equipment.

[0004] Therefore, a vacuum suction device for calendering auxiliary agent production is needed to overcome the defects of powder auxiliary agent forming an adherent layer on the inner wall of the suction pipe and gradually clogging, causing pipe blockage, insufficient vacuum pressure and suction failure. SUMMARY

[0005] The utility model aims at least solves one of the technical problems existing in the prior art. Therefore, one purpose of the utility model is to provide a vacuum suction device for calendering auxiliary agent production, which comprises a suction device main body connected with a negative pressure source and a suction pipeline connected with the suction device main body, wherein the suction pipeline at least comprises an inner layer forming the suction channel and an outer layer arranged opposite to the inner layer, and a sandwiched cleaning track extending along the axial direction of the pipeline and sealed at both ends is formed between the inner layer and the outer layer; at least one cleaning member guided to move in the sandwiched cleaning track is arranged in the sandwiched cleaning track, the cleaning member is isolated from the suction channel and is arranged corresponding to the opposite area of the inner layer; the outer layer is provided with a driving member, the driving member drives the cleaning member to reciprocate along the sandwiched cleaning track in a non-contact manner; and the inner layer is provided with a disturbance transmission structure in the opposite area, which is used to couple at least one of mechanical impact, vibration or field-induced vibration generated in the sandwiched cleaning track to the inner wall of the inner layer under the condition of keeping the suction channel sealed and isolated.

[0006] In a possible implementation, the driving member comprises a plurality of electromagnetic coils arranged axially along the material suction pipeline and used to drive the cleaning member in the sandwich cleaning track; and an electromagnetic control unit used to control the electromagnetic coils to be sequentially excited and demagnetized so as to drive the cleaning member to move in the sandwich cleaning track.

[0007] In a possible implementation, the electromagnetic coils are arranged axially along the linear cleaning section of the material suction pipeline, and the axial distance between adjacent electromagnetic coils is 50-100 mm, used to drive the cleaning member to move in the sandwich cleaning track.

[0008] In a possible implementation, the electromagnetic control unit is provided with a time sequence control module used to sequentially excite the electromagnetic coils according to a preset sequence and set a time delay between excitations, so as to drive the cleaning member to move smoothly in the sandwich cleaning track.

[0009] In a possible implementation, the inner layer is made of at least one of polytetrafluoroethylene, antistatic polyurethane and food-grade silica gel, and the inner surface is provided with an antistatic and low-friction coating layer.

[0010] In a possible implementation, the perturbation transmission structure is an array of convex points arranged on the outer surface of the inner layer on the side facing the sandwich cleaning track, the center distance of the convex points of the array of convex points is 5-20 mm, and the height of the convex points is 0.3-1.5 mm.

[0011] In a possible implementation, the cleaning member is a ring-shaped member, the outer surface of which is covered with an elastic wear-resistant layer with a Shore A hardness of 60-90, and the inside of which is embedded with a permanent magnet or a ferrite magnetic body.

[0012] In a possible implementation, the radial gap of the sandwich cleaning track is 4-10 mm, and the axial width of the cleaning member is 8-20 mm.

[0013] In a possible implementation, the material suction pipeline comprises a linear cleaning section and a flexible turning section, the electromagnetic coils are arranged on the linear cleaning section, and the flexible turning section is not provided with electromagnetic coils or is provided with only a short section of flexible magnetic track.

[0014] In a possible implementation, the outer layer is provided with a Hall sensor used to detect the position of the cleaning member, and the output signal of the Hall sensor is used to control the end-of-stroke reset of the cleaning member in the sandwich cleaning track.

[0015] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood to have the following beneficial effects through the practice of the present application. Based on the above technical scheme, the vacuum material suction device for calendering auxiliary agent production, a sandwich cleaning track extending along the axial direction and sealed at both ends is formed between the inner layer and the outer layer of the material suction pipeline, a cleaning piece isolated from the material suction channel is arranged therein, and the cleaning piece is driven by the non-contact driving piece of the outer layer to reciprocate along the sandwich cleaning track; at the same time, a disturbance transmission structure is arranged at the opposite regions of the inner layer, at least one of the mechanical impact, vibration or field-induced vibration generated in the sandwich is effectively coupled to the inner wall of the inner layer, the adhesion layer of the inner wall is continuously disturbed and loosened under the condition of not damaging the sealing of the material suction channel and not directly contacting the material, thereby solving the technical problems that the powder auxiliary agent adheres to the inner wall of the material suction pipeline and gradually agglomerates, causing pipeline blockage, insufficient vacuum pressure and material suction failure. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, a brief introduction will be given below to the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0017] Figure 1 A structure schematic view of a vacuum material suction device for calendering auxiliary agent production is provided for the embodiments of the present application. Figure 2 For Figure 1 A structure schematic view of a straight cleaning section in the device is shown. Figure 3 For Figure 2 An enlarged view of area A in the device.

[0018] Explanation of reference signs: 1, material suction device main body; 2, material suction pipeline; 3, inner layer; 4, outer layer; 5, sandwich cleaning track; 6, cleaning piece; 7, driving piece; 8, disturbance transmission structure; 9, electromagnetic coil; 10, electromagnetic control unit; 11, straight cleaning section; 12, flexible turning section; 13, Hall sensor. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] In the description of the utility model, it is necessary to understand that the orientation or positional relation indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" is the orientation or positional relation based on the orientation or positional relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as limiting the utility model indicated or implied by the device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the features limited by "first" and "second" can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0021] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected, it can be mechanical connection, or electrical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0022] The embodiments of the utility model are described in detail below, and the examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0023] Figure 1 The structure schematic view of a vacuum suction device for calendering auxiliary agent production provided by the utility model embodiment is shown in the figure; Figure 2 The structure schematic view of the linear cleaning section in the device is shown in the figure; Figure 1 The structure schematic view of the linear cleaning section in the device is shown in the figure; Figure 3 The structure schematic view of the linear cleaning section in the device is shown in the figure; Figure 2 The enlarged view of area A in the figure.

[0024] Please refer to Figures 1-3In one possible implementation, a vacuum suction device for calendering auxiliary agent production includes a suction device body 1 in communication with a negative pressure source and a suction pipe 2 connected to the suction device body 1. The suction pipe 2 includes at least an inner layer 3 forming a suction passage and an outer layer 4 arranged opposite to the inner layer 3. A sandwiched cleaning track 5 extending along the axial direction of the pipe and sealed at both ends is formed between the inner layer 3 and the outer layer 4. At least one cleaning member 6 guided to move in the cleaning track 5 is arranged in the cleaning track 5. The cleaning member 6 is isolated from the suction passage and arranged corresponding to the facing area of the inner layer 3. The outer layer 4 is provided with a driving member 7. The driving member 7 drives the cleaning member 6 to reciprocate along the cleaning track 5 in a non-contact manner. The inner layer 3 is provided with a disturbance transmission structure 8 at the facing area. The disturbance transmission structure 8 is used to couple at least one of mechanical impact, vibration or field-induced vibration generated in the cleaning track 5 to the inner wall of the inner layer 3 under the condition of keeping the suction passage sealed and isolated.

[0025] The device establishes a stable negative pressure area in the suction device body 1 by the negative pressure source. The negative pressure forms a continuous suction force through the suction passage of the suction pipe 2, continuously sucks and transports the calendering auxiliary agent from the storage container to the downstream process equipment. In order to inhibit the adhesion and accumulation of the material on the inner wall of the pipe, the suction pipe 2 adopts a double-layer coaxial structure. The sandwiched area sealed at both ends forms a cleaning track extending along the axial direction. The cleaning member 6 is arranged in the sandwiched track and is strictly isolated from the suction passage. The controllable movement along the track is realized by the force generated by the non-contact driving member 7 on the outer layer 4. The cleaning member 6 introduces periodic or pulsed mechanical impact and vibration in the sandwiched layer when moving, or induces equivalent vibration under electromagnetic / ultrasonic field conditions. The disturbance transmission structure 8 arranged at the facing area of the inner layer 3 efficiently couples the above-mentioned energy to the inner wall, converts it into high-frequency micro-vibration and local shear at the inner wall, thereby breaking the adhesive bridge and the real contact area between the particles and the wall surface, making the initially adhered particles re-enter the gas-solid two-phase mainstream and be carried away. The strong adhesion points are gradually fatigued and peeled off under the repeated micro-impact and micro-shear action. Thus, the on-line self-cleaning of the inner wall is realized during the transportation process. Since the cleaning process is completely carried out in the sealed sandwiched layer and does not directly contact the material, the cleanliness of the suction passage and the stability of the system negative pressure are maintained.

[0026] The double-layer pipe structure with the sandwiched cleaning track 5 and non-contact driving makes the disturbance generated by the cleaning member 6 continuously act on the inner wall without interfering with the material transportation, realizes on-line adhesion inhibition and adhesion removal without stopping, significantly reduces the risk of pipe blockage and improves the long-period stable operation ability. The cleaning member 6 is isolated from the material passage, avoiding the problem of scratching / polluting the material, and is suitable for calendering auxiliary agent transportation with high requirements for cleanliness and formula stability. The non-contact driving eliminates the mechanical transmission structure penetrating through the outer layer 4, reduces the leakage and wear links, and improves the sealing reliability and durability.

[0027] Please refer to Figure 2、 3 In one possible implementation, the driving member 7 includes a plurality of electromagnetic coils 9 arranged axially spaced along the material suction duct 2 for applying magnetic force to drive the cleaning member 6 in the sandwich cleaning track 5; and an electromagnetic control unit 10 is arranged for controlling the electromagnetic coils 9 to be sequentially excited and demagnetized so that the cleaning member 6 is guided to move continuously along the sandwich cleaning track 5.

[0028] The electromagnetic coils 9 are fixed outside the outer layer 4 corresponding to the sandwich cleaning track 5, and when energized, a local magnetic field potential well is formed in the sandwich area, and the cleaning member 6 in the sandwich is attracted by the magnetic force due to the embedded magnetic body and tends to approach the magnetic field center of the excited coil. The electromagnetic control unit 10 sequentially excites the adjacent coils according to the preset timing and quickly demagnetizes the previous coil, forming a magnetic field potential well that "moves" axially in the sandwich, thereby pulling the cleaning member 6 to produce continuous linear guided motion; when the excitation sequence is changed, the potential well moves in the opposite direction, and the cleaning member 6 moves in the opposite direction. The control unit limits the coil current rise slope and maintains the target peak value by current closed loop and PWM duty cycle modulation, so as to maintain stable traction force under different load and negative pressure conditions; when the adjacent coils are connected, the overlapping excitation and soft demagnetization are used to suppress the magnetic force jump, so as to avoid the shaking or "tooth slot feeling" of the cleaning member 6, and the smooth transition of speed and acceleration is realized through the gradual trigger delay. While the cleaning member 6 is continuously pulled in the axial direction, the energy coupling occurs between the cleaning member 6 and the disturbance transmission structure 8 in the area facing the inner layer 3, which converts the sequential magnetic displacement into high-frequency micro-vibration and intermittent impact of the inner wall, and then performs online disturbance and peeling of the adhering matter on the inner wall without damaging the sealing isolation of the material suction passage. The control unit can store multiple sets of operation curves to match different formulations and conveying stages (such as start-up, steady state, cleaning, and return), and can realize adaptive control of speed, thrust, and disturbance frequency band by adjusting the coil energizing time, phase difference, and group beat.

[0029] The sequential driving of the electromagnetic coils 9 and the electromagnetic control unit 10 can generate programmable traction force without mechanical contact in the sealed sandwich, making the movement of the cleaning member 6 more stable and controllable, reducing the wear of the structures of the outer layer 4 and the inner layer 3, and reducing the risk of noise and particle shedding; the "moving magnetic potential well" formed by sequential excitation and demagnetization can provide continuous guidance rather than intermittent knocking, thereby maintaining cleaning efficiency while suppressing disturbance to the system negative pressure and material mainstream, and realizing adaptive cleaning of different adhesion strengths and different physical properties of materials through parameterized control; soft start and stop and overlapping commutation effectively weaken the mechanical impact of the cleaning member 6 at the transition of adjacent coils, improve the reliability and stability of long-period operation, and the current closed loop suppresses the temperature rise and energy consumption, so that the system has comprehensive advantages in efficiency and service life.

[0030] Further, the electromagnetic coil 9 can be selected as a hollow coil or a coil with a soft magnetic core according to the installation space and thermal management requirements, and can use multiple strands of parallel winding or flat wire to reduce AC loss and thermal resistance. The coil frame can form an integrated annular groove structure with the outer layer 4 to facilitate positioning and heat dissipation. The electromagnetic control unit 10 can use a distributed drive architecture, with the power stage close to the coil to shorten the loop and reduce EMI, and the control stage issuing timing and current set values through a bus. The drive waveform can also use micro-step subdivision or approximate sine current in addition to square waves to achieve smoother traction effect.

[0031] Referring to Figure 2 , 3 In one possible implementation, the electromagnetic coils 9 are arranged axially along the straight cleaning section 11 of the material suction pipeline 2, and the axial spacing between adjacent electromagnetic coils 9 is 50-100 mm, for driving the cleaning member 6 to move in the interlayer cleaning track 5.

[0032] The straight cleaning section 11 is the main driving area of the interlayer cleaning track 5, and annular electromagnetic coils 9 are fixed equidistantly along the axis on the outside of the outer layer 4. The center of the coil is coaxial with the center of the interlayer cleaning track 5, and the coil pitch is set to 50-100 mm. When the electromagnetic control unit 10 overlaps the excitation of adjacent coils according to the preset timing and soft demagnetizes the previous coil, a magnetic field potential well that moves continuously in the axial direction will be formed inside the interlayer, and the cleaning member 6 will be steadily pulled forward due to the magnetic force acting on the internal magnetic body. Since the coil spacing is in the range of 50-100 mm, the magnetic flux distribution of adjacent two coils has sufficient overlap in the transition area, so that the cleaning member 6 is always under the coverage of effective magnetic pull when crossing the transition area, avoiding significant valley of traction force and reducing speed pulsation. At the same time, the geometric straightness of the straight cleaning section 11 ensures the consistency of the coil magnetic axis and the interlayer track, reducing the transverse force component and preventing the cleaning member 6 from producing yaw or jamming in the interlayer. By adjusting the excitation duty ratio and phase difference, the required running speed and disturbance frequency of the cleaning member 6 can be obtained under the condition of fixed pitch, so that the energy coupling is stably applied to the inner wall of the material suction channel through the disturbance transmission structure 8 of the inner layer 3, thereby realizing continuous online self-cleaning.

[0033] Among them, the electromagnetic coils 9 are arranged in the straight cleaning section 11 with an axial pitch of 50-100 mm, so that the overlapping magnetic field continuously covers the motion track of the cleaning member 6 in the entire section, the traction force output is more smooth, the mechanical impact and speed fluctuation of the cleaning member 6 during transition are significantly reduced, and the stability of disturbance coupling and cleaning efficiency are improved. The concentrated arrangement of coils in the straight section facilitates standardized installation and cable management, reduces the assembly complexity and heat accumulation problems at the bending part, and is beneficial to heat dissipation and reliability. The pitch in the medium range can control the number of coils and power consumption while ensuring sufficient traction redundancy, taking into account energy efficiency, cost and maintenance convenience.

[0034] Referring toFigure 2 、 3 In a possible implementation, the electromagnetic control unit 10 is provided with a time sequence control module for sequentially exciting the electromagnetic coils 9 according to a preset sequence and setting a delay between excitations to drive the cleaning member 6 to achieve smooth unidirectional or reciprocating movement in the interlayer cleaning track 5.

[0035] The time sequence control module is built-in with a coil sequence table and a delay parameter library. By controlling the on-off of each coil, the adjacent coils are sequentially powered according to the set phase and form a smooth "displacement" of the magnetic potential well in the handover area. To avoid sudden changes in traction, the module introduces an adjustable delay and current overlap time window between the demagnetization of the current coil and the magnetization of the next coil, and uses slope limitation and current loop control for the rising / falling edge of the current to make the magnetic flux change approximately continuous; in the unidirectional mode, the coil index is circulated in ascending or descending order, and the delay Δt is calculated as Δt≈p / v according to the target running speed v and the coil pitch p (which can be referred to as 50-100 mm), and S-curve acceleration / deceleration is applied in the start-stop stage to limit the jerk, so that the speed, acceleration and traction force vector of the cleaning member 6 are continuously transitioned; in the reciprocating mode, the sequence is played back in reverse at both ends, the step phase is automatically shortened near the endpoints and the overlap time is extended to suppress the endpoint bounce, while the duty cycle fine-tuning and current feedforward compensation are used to overcome local resistance fluctuations in the pipeline. The module can select constant-speed cleaning, enhanced cleaning and return three working conditions according to the running curve, and support adaptive fine-tuning of the delay and waveform according to the disturbance frequency band, so that the micro-vibration coupled to the inner wall through the disturbance transmission structure 8 is maintained within the required frequency range and the energy density is stable.

[0036] Through precise management of the coil excitation sequence and handover delay, the traction force of the cleaning member 6 in the interlayer cleaning track 5 realizes continuous output with no tooth feeling, low pulsation and low impact, thereby significantly reducing the risk of jamming and step loss and improving the stability of long-time operation; S-curve start-stop and phase overlap make the endpoint reversal smooth, reduce the structural stress impact on the outer layer 4 and the inner layer 3, and reduce noise and wear; the time sequence optimized according to the speed and frequency band in a closed loop makes the inner wall receive more stable disturbance energy injection, the cleaning effect is more repeatable, and it has better robustness to different material adhesion states and conveying negative pressure fluctuations. At the same time, due to the on-demand energy allocation, the system power consumption and coil temperature rise are suppressed, and the overall efficiency is higher and the service life is longer.

[0037] In a possible implementation, the inner layer 3 is made of at least one of polytetrafluoroethylene, antistatic polyurethane and food-grade silica gel, and the inner surface is provided with an antistatic and low-friction coating layer.

[0038] The inner layer 3 material reduces the adhesion probability of the material in the conveying process through the combined action of its intrinsic surface energy, dielectric properties and elastic modulus: polytetrafluoroethylene has extremely low surface energy and excellent chemical inertness, which can significantly weaken the van der Waals interaction and wetting spreading, thereby inhibiting the wetting-adhesion of the calendaring aid to the pipe wall from the source; the antistatic polyurethane maintains toughness and wear resistance while forming a charge dissipation path through the conductive phase or ion channel inside the material, thereby reducing the electrostatic adhesion caused by the friction electrification of the gas-solid two-phase flow; the food-grade silica gel has a soft surface and certain resilience, which can produce micro-scale deformation under the action of particle impact and disturbance, thereby reducing the actual contact area and weakening the adhesion bridge. The antistatic and low-friction coating layer on the inner surface further builds a double barrier at the interface: on the one hand, the low-friction / low-surface-energy molecular orientation layer or fluoropolymer phase reduces the shear resistance and adhesion work, and on the other hand, the uniform dissipation network inside the coating layer discharges the accumulated charge in the form of a micro-current to the preset grounding path or adjacent conductive layer, thereby avoiding the continuous accumulation of static potential and inducing re-adhesion; when the cleaning member 6 in the interlayer cleaning track 5 is periodically disturbed by the outer layer 4, the low-friction surface more efficiently converts the disturbance energy into tangential micro-vibration of the inner wall, thereby making the weakly adhered particles more easily carried away by the main flow, and thus forming a synergy with the online cleaning mechanism of the device.

[0039] By using the above-mentioned materials and coating combination, the three dominant adhesion mechanisms of "electrostatic adhesion-interface wetting-mechanical embedding" can be simultaneously inhibited, thereby significantly reducing the inner wall hanging material and fouling, stabilizing the conveying flow and reducing the pressure drop fluctuation; the low-friction interface reduces the friction work consumption and heat accumulation of the material and the wall, thereby delaying material aging and reducing energy consumption; the material system has good chemical resistance and cleanliness, and is suitable for calendaring aids containing plasticizers, solvents or surface-active components, thereby reducing the potential influence on the purity and hygiene grade of the formula; after synergy with the interlayer cleaning disturbance, the same cleaning effect can be obtained at a lower disturbance intensity, thereby prolonging the service life of the driving system and the pipeline and reducing the maintenance frequency and downtime.

[0040] Please refer to Figure 2 、 3 In one possible implementation, the disturbance transmission structure 8 is an array of protrusions arranged on the outer surface of the inner layer 3 facing the interlayer cleaning track 5, the center distance of the protrusions in the array of protrusions is 5-20 mm, and the height of the protrusions is 0.3-1.5 mm.

[0041] The convex point array is arranged on the outer surface of the inner layer 3 and faces the interlayer cleaning track 5, so that mechanical impact or magnetic vibration generated by the cleaning piece 6 when moving along the track under the driving action is preferentially coupled to the microconvex parts, and the local curvature and stiffness difference caused by the geometric protrusion of the convex point enables stress concentration and displacement amplification at the root and top end area of the convex point, thereby converting the macroscopic displacement on the interlayer side into high-frequency micro-vibration in the thickness direction and tangential direction of the inner layer 3; when there are particles initially attached in the suction channel on one side of the inner wall, the amplified micro-vibration and shear disturbance are transmitted to the inner wall along the thickness of the inner layer 3, breaking the adhesive bridge and actual contact area between the particles and the wall surface, so that the weakly attached particles are separated and carried away by the main gas-solid two-phase flow, and the strongly attached particles are also gradually peeled off under the continuous cyclic micro-impact; the convex point center distance is controlled within the range of 5-20 mm to balance the disturbance coverage and the number of structures, ensuring uniform energy distribution in the axial and circumferential directions and avoiding the formation of obvious "dead zones", and the convex point height is controlled within the range of 0.3-1.5 mm to provide sufficient displacement amplification ratio and avoid excessive change of the overall stiffness of the inner layer 3 or the generation of non-expected mechanical contact with the cleaning piece 6, thereby stably achieving energy coupling and self-cleaning of the inner wall while maintaining the sealing isolation of the suction channel.

[0042] After adopting the convex point array with the above geometric dimensions, the disturbance energy can obtain higher equivalent micro-vibration amplitude and effective frequency band of the inner wall under limited driving energy, the cleaning efficiency is improved and the dependence on driving power is reduced, the overall energy consumption and coil temperature rise of the system are inhibited; the regular array makes the disturbance distribution more uniform in the axial and circumferential directions, reduces the cleaning dead angle and stabilizes the pressure drop and flow; the convex points are located on the outer surface of the inner layer 3, which does not invade the suction channel and does not directly contact the material, and the cleanliness and washability are considered, while the integrity and durability of the sealing structure at both ends of the interlayer are maintained; the size-controlled microstructure can also improve the coupling sensitivity of the structure to vibration without significantly increasing the thickness of the inner layer 3, prolong the cooperative working life of the driving and pipeline and reduce the maintenance frequency.

[0043] In one possible implementation, the cleaning piece 6 is a ring-shaped member, the outer surface of which is covered with an elastic wear-resistant layer with a Shore A hardness of 60-90, and the inside is embedded with a permanent magnet or a ferrite magnetic body, so that the cleaning piece 6 is guided to move under the action of the non-contact driving piece 7 of the outer layer 4 in the interlayer cleaning track 5, and at the same time, efficient disturbance energy coupling is realized with the opposite area of the inner layer 3.

[0044] The annular cleaning member 6 obtains stable dynamic balance in the sandwich cleaning track 5 through the symmetry of its circumferential mass distribution, the permanent magnet or ferrite magnetic body embedded in the inner part of the ring generates controllable magnetic force response under the excitation of the external electromagnetic coil 9, and the magnetic field potential well "moves" along the axial direction, forming a continuous traction on the cleaning member 6; the elastic wear-resistant layer on the outer surface of the cleaning member 6 has a hardness range of Shore A 60-90 to balance between "stiffness-damping-wear resistance": when the hardness is higher, it can improve the coupling efficiency of the magnetic displacement disturbance transmission structure 8 to the inner layer 3, obtain a larger equivalent micro-amplitude and shear component, and when the hardness is lower, it can absorb high-frequency impact to suppress noise and vibration peaks, so as to maintain stable energy injection and low wear operation in the track under different working conditions; the coaxial cooperation of the annular cross section and the sandwich track makes the radial and circumferential force components as symmetrical as possible, reduces the risk of deflection and jamming, and the micro-scale contact between the surface of the elastic layer and the inner wall of the outer layer 4 provides controllable damping in the magnetic traction transient state, which is beneficial to the smoothing of the commutation transition and the fine control of the speed of the cleaning member 6, and finally the mechanical impact, vibration or field-induced vibration is efficiently coupled to the inner wall of the inner layer 3 through the disturbance transmission structure 8 such as the convex points or corrugations on the outer side of the inner layer 3, realizing online disturbance and peeling of the adhesions on the inner wall of the material suction channel, while keeping sealed isolation with the material space throughout the process.

[0045] It is worth noting that the annular configuration makes the cleaning member 6 have natural dynamic balance and attitude self-stability in axial guidance, reducing the sensitivity to track geometric tolerances and reducing abnormal lateral loads; the elastic wear-resistant layer in the Shore A 60-90 range can achieve an optimal compromise between energy transmission efficiency and durability, ensuring sufficient disturbance coupling strength while significantly reducing the generation of noise, impact and wear dust; the internal magnetic body provides stable magnetic response without additional mechanical interface, and cooperates with non-contact driving to realize long-term operation with sealed reliability and low maintenance.

[0046] In one possible implementation, the radial gap of the sandwich cleaning track 5 is 4-10 mm, and the axial width of the cleaning member 6 is 8-20 mm.

[0047] The radial gap of the interlayer cleaning track 5 defines the allowable radial displacement and attitude deviation of the cleaning member 6 under the condition of non-contact driving, and the value thereof is 4-10 mm. When the value is 4-10 mm, hard contact between the cleaning member 6 and the inner wall of the outer layer 4 can be avoided, sufficient movement allowance can be provided to absorb the size fluctuation caused by manufacturing tolerance, assembly deviation and thermal expansion and contraction, and the necessary slight follow-up of the cleaning member 6 during electromagnetic traction phase conversion can be generated without being stuck. When the radial gap is too small, the cleaning member 6 is prone to rubbing against the inner wall of the outer layer 4 at the driving peak or local bending, which reduces the service life and introduces particle pollution. When the gap is too large, the effective magnetic force density of the magnetic field on the cleaning member 6 is weakened and the attitude swing is enlarged, which affects the guiding stability and disturbance coupling efficiency. The axial width of the cleaning member 6 is set to 8-20 mm, which can ensure sufficient effective force area and magnetic circuit coupling area, control the mass and moment of inertia of the cleaning member 6, and make the cleaning member 6 have sensitive and stable following ability to the "moving magnetic potential well" formed by the time sequence driving. Insufficient width will lead to a decrease in traction force margin and narrow the action area of the cleaning member 6 on the disturbance transmission structure 8 of the inner layer 3, thereby affecting the cleaning coverage and energy injection consistency. Too large width will increase the mass and damping, increase the driving power and phase conversion burden, and reduce the response of high-frequency disturbance. The matching of the radial gap and the axial width enables the cleaning member 6 to obtain stable axial guidance and moderate radial compliance in the interlayer track. The slight elastic deformation of the outer elastic layer of the cleaning member 6 and the disturbance transmission structure 8 such as the outer side protrusions of the inner layer 3 cooperate to convert the displacement-speed change caused by electromagnetic actuation into high-frequency micro-vibration and shear disturbance on the inner wall side, thereby realizing online adhesion and peeling of the attachments on the inner wall of the material suction channel while maintaining the sealing isolation of the material space and the low disturbance to the negative pressure conveying.

[0048] The use of a radial gap of 4-10 mm and an axial width of 8-20 mm enables the cleaning member 6 to have reliable anti-sticking ability and excellent guiding stability in the full stroke, reduces friction and noise caused by machining and assembly errors, and improves the reliability of long-period operation. Suitable width brings more uniform inner wall disturbance coverage and more stable energy coupling, so that the cleaning efficiency remains consistent under different working conditions. At the same time, due to the controlled mass and damping, the driving power, coil temperature rise and system energy consumption are simultaneously reduced. The coordinated matching of the gap and the width also suppresses the attitude swing and lateral force of the cleaning member 6, reduces the structural stress impact on the outer layer 4 and the inner layer 3, and maintains the flow stability and pressure drop smoothness during the negative pressure conveying process.

[0049] Please refer to Figures 1-3 In a possible implementation, the material suction pipeline 2 includes a straight cleaning section 11 and a flexible turning section 12, and the electromagnetic coil 9 is arranged in the straight cleaning section 11, while the flexible turning section 12 is not provided with the electromagnetic coil 9 or is provided with only a short section of flexible magnetic track.

[0050] The main driving force area of the cleaning drive is concentrated in the straight cleaning section 11 in this embodiment. A continuous moving magnetic potential well is formed in the sandwich cleaning track 5 by the axially arranged electromagnetic coils 9 and their time sequence control, realizing stable traction and disturbance energy injection of the cleaning piece 6. When the cleaning piece 6 runs to the flexible turning section 12, the cleaning piece 6 mainly relies on the inertia of the previous section, the geometric guidance of the sandwich, and the fluid-structure coupling resistance gradient caused by vacuum conveying to smoothly pass through the curved path, avoiding magnetic axis deviation and cable stress concentration at the coil bending position. If a short section flexible magnetic track is configured, the magnetic track can be arranged along the inner side of the bend using bendable magnetic elastic materials or flexible printed magnetic circuits to form a weak to moderate directional magnetic field "guiding window" at the entrance and exit of the bend section, used to complete the traction between the straight driving area and the bend section, and the traction between the bend section and the next straight driving area. The role is to suppress the attitude yaw and radial drift of the cleaning piece 6 in the bend section, and to align the magnetic center of the cleaning piece 6 with the magnetic axis of the next set of straight coils when exiting the bend, thereby realizing smooth commutation and continuity of energy coupling. Through the above partition arrangement, the system avoids the problems of magnetic leakage, heat dissipation and mechanical fatigue caused by wiring coils at small curvature radius positions while maintaining the sealing isolation of the material suction channel and the continuity of the inner wall disturbance.

[0051] Limiting the electromagnetic coils 9 to the straight cleaning section 11 can significantly simplify the structure and wiring of the curved area, reduce assembly complexity and maintenance difficulty, avoid the risks of insulation aging, coil deformation and heat accumulation caused by coil bending, and improve the long-term reliability of the system. The flexible turning section 12 without coils can reduce the radial size and bending stiffness of the outer layer 4, improve the freedom of pipeline laying and reduce the installation space requirement, while reducing electromagnetic interference and invalid power consumption. In scenarios where passing smoothness needs to be improved, only short section flexible magnetic tracks are set to obtain the auxiliary effect of attitude constraint and exit alignment, so that the cleaning piece 6 can still realize smooth transition and stable disturbance injection under different layouts, maintain a relatively low energy consumption and noise level, and maintain cleaning efficiency and flow stability of negative pressure conveying in complex pipelines.

[0052] Please refer to Figure 2 、 3 In one possible embodiment, the outer layer 4 is provided with a Hall sensor 13 for detecting the position of the cleaning piece 6, and the output signal thereof is used to control the travel end reset of the cleaning piece 6 in the sandwich cleaning track 5.

[0053] The Hall sensor 13 is coaxially arranged along the outer layer 4 and the interlayer cleaning track 5, and forms a magnetic coupling position detection relationship with the permanent magnet or magnetic body inside the cleaning piece 6. When the cleaning piece 6 moves to the corresponding axial position of the sensor, the local magnetic flux density exceeds the set threshold, and the sensor output generates a clear level flip or analog voltage peak. The original signal is input into the time sequence control module of the electromagnetic control unit 10 after being amplified and anti-interference filtered, and is interpreted as an event trigger of “reaching the end point”, “passing the reference position” or “entering the buffer zone”, so that the phase change, deceleration, stop or reverse control strategy of the coil excitation sequence is implemented, and the precise resetting and repeated positioning of the stroke end point are realized. In order to suppress the transient noise brought by the phase change of the electromagnetic coil 9 and the eddy current disturbance of the adjacent metal parts, the position detection link adopts the combination of Schmidt comparison and digital de-bouncing to form an anti-jitter hysteresis window, and a time-position double threshold criterion is enabled in the end point area to avoid false triggering; after the system is powered on or the cleaning piece 6 is replaced, the control unit first sweeps at low speed to find the end point calibration sensor, automatically records the magnetic threshold and time sequence compensation amount under the current temperature and negative pressure working condition, and then periodically reviews and fine-tunes the compensation in normal operation, so as to ensure the consistency of the end point under long-term drift. After the end point resetting is completed, the time sequence control automatically switches to the normal cleaning or reciprocating cleaning curve according to the target operation mode, and the Hall position signal can also be used as a reference for speed and phase closed loop in the whole stroke, so as to maintain the smooth traction and stable disturbance coupling of the cleaning piece 6 under different loads and pipe section resistance changes.

[0054] The introduction of Hall position detection and end point resetting control makes the reversing position and effective stroke length of the cleaning piece 6 no longer rely on open-loop time estimation, the end point repetition accuracy is significantly improved, and the stroke drift, end cover impact or unswept blind area caused by accumulated error are avoided; the position event trigger and S-curve deceleration can effectively suppress overshoot and rebound near the end point, reduce the impact load and noise of the outer layer 4 and the inner layer 3, and prolong the service life of the pipeline and the driving system; the hysteresis and de-bouncing strategy improves the anti-interference ability in strong electromagnetic environment and negative pressure fluctuation condition, and ensures the reliability of long-term continuous operation; the speed / phase micro-closed loop based on position reference makes the cleaning piece 6 maintain stable disturbance frequency and energy injection under different working conditions, and the cleaning effect is more repeatable and energy consumption is more controllable.

[0055] In the description of the present specification, the description of the terms “one embodiment”, “some embodiments”, “illustrative embodiment”, “example”, “specific example” or “some examples” means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0056] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made in the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

[0057] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0058] Although the embodiments of the present application have been shown and described, it should be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made in the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A vacuum feeding device for producing calendering aids, comprising a feeding device body connected to a negative pressure source and a feeding pipe connected to the feeding device body, characterized in that: The suction pipe includes at least an inner layer forming a suction channel and an outer layer disposed opposite to the inner layer, wherein the inner layer and the outer layer form a sandwich cleaning track that extends along the pipe axis and is sealed at both ends. At least one cleaning component is provided in the interlayer cleaning track, which can be guided to move therein. The cleaning component is isolated from the suction channel and is provided in a corresponding area of ​​the inner layer. The outer layer is provided with a driving component, which drives the cleaning component to reciprocate along the interlayer cleaning track in a non-contact manner. Furthermore, the inner layer is provided with a disturbance transmission structure in the opposing region, which is used to couple at least one of the mechanical impacts, vibrations or field-induced vibrations generated in the interlayer cleaning track to the inner wall of the inner layer while maintaining the sealed isolation of the suction channel.

2. The vacuum feeding device for producing calendering aids according to claim 1, characterized in that, The driving component includes: Several electromagnetic coils are arranged at intervals along the axial direction of the suction pipe to apply magnetic force to the cleaning components in the interlayer cleaning track; An electromagnetic control unit is used to control the electromagnetic coil to be sequentially excited and demagnetized, so that the cleaning component can be continuously guided to move along the interlayer cleaning track.

3. The vacuum feeding device for producing calendering aids according to claim 2, characterized in that, The electromagnetic coil is arranged axially along the straight cleaning section of the suction pipe, and the axial distance between adjacent electromagnetic coils is 50-100mm, which is used to drive the cleaning component to move within the interlayer cleaning track.

4. The vacuum feeding device for producing calendering aids according to claim 2, characterized in that, The electromagnetic control unit is equipped with a timing control module, which is used to excite the electromagnetic coils sequentially according to a preset order and set a delay between excitations to drive the cleaning component to achieve smooth unidirectional or reciprocating movement within the interlayer cleaning track.

5. The vacuum feeding device for producing calendering aids according to claim 1, characterized in that, The inner layer is made of at least one of polytetrafluoroethylene, antistatic polyurethane, and food-grade silicone, and the inner surface is provided with an antistatic and low-friction coating.

6. The vacuum feeding device for producing calendering aids according to claim 5, characterized in that, The disturbance transmission structure is an array of protrusions arranged on the outer surface of the inner layer facing the cleaning track of the interlayer. The center distance between the protrusions in the array is 5 to 20 mm, and the height of the protrusions is 0.3 to 1.5 mm.

7. The vacuum feeding device for producing calendering aids according to claim 1, characterized in that, The cleaning component is a ring-shaped member, with its outer surface covered with an elastic wear-resistant layer of Shore A 60-90, and its interior embedded with a permanent magnet or ferrite magnet.

8. The vacuum feeding device for producing calendering aids according to claim 7, characterized in that, The radial clearance of the interlayer cleaning track is 4–10 mm, and the axial width of the cleaning component is 8–20 mm.

9. The vacuum feeding device for producing calendering aids according to claim 2, characterized in that, The suction pipe includes a straight cleaning section and a flexible turning section. The electromagnetic coil is located in the straight cleaning section, while the flexible turning section does not have an electromagnetic coil or only has a short flexible magnetic track.

10. The vacuum feeding device for producing calendering aids according to claim 2, characterized in that, The outer layer is equipped with a Hall sensor for detecting the position of the cleaning component, and its output signal is used to control the reset of the travel end point of the cleaning component in the interlayer cleaning track.

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