Anti-bridging device of weightlessness type feeding machine based on powder fluidization technology

Abstract

The invention discloses an anti-bridging device of a weightlessness type feeding machine based on a powder fluidization technology, and relates to the technical field of feeding machines, the anti-bridging device comprises the weightlessness type feeding machine, the weightlessness type feeding machine comprises a main bin and a stock bin located below the main bin; the anti-bridging assembly is embedded into the side wall of the weightlessness type feeding machine; the aerators are distributed in the main bin, air is supplied to the aerators through air nozzles on the aerators by air pipes, and on-off of the air pipes is controlled by electromagnetic valves; the exhaust assembly is arranged at the top of the main bin; the electromagnetic valve and the exhaust assembly are both controlled by a controller, the controller can control exhaust parameters of the exhaust assembly to be matched with aeration parameters of the aerator, and active and passive arch breaking of the anti-bridging assembly can be achieved through cooperation of the anti-bridging assembly and the aerator.

Description

Technical Field

[0001] The present invention relates to the technical field of feeders, and in particular to a weightless feeder anti-bridging device based on powder fluidization technology. Background Art

[0002] In the field of powder processing and feeding, loss-in-weight feeders are widely used in food, medicine, chemical and other industries due to their high-precision metering characteristics.

[0003] However, powder materials are prone to forming bridges in the silo due to friction between particles, electrostatic adsorption or viscosity, resulting in interruption of feeding or flow fluctuation, which seriously affects feeding continuity and metering accuracy.

[0004] Traditional solutions to the bridging problem rely primarily on mechanical stirring devices, which utilize mechanical disturbances to disrupt the powder structure by installing horizontal or vertical stirring paddles within the silo. However, these devices have significant drawbacks: the complex and bulky stirring mechanism not only increases the overall weight of the equipment but also requires a larger-capacity weighing sensor, which directly reduces measurement accuracy. Furthermore, mechanical vibrations during the stirring process disrupt the static balance of the weighing system, causing measurement errors. More critically, the stirring paddle's non-directional disturbance of the powder has limited effectiveness in breaking up bridging structures formed by loose or sticky powders (such as sidewall adhesion and bottom accumulation). Bridging still has a small probability of occurring, making it impossible to meet the requirements of high-precision, high-stability feeding.

[0005] In recent years, powder fluidization technology has emerged as a potential alternative to mechanical mixing, as it uses gas injection to suspend powder particles and generate shear forces. However, existing fluidized anti-bridging devices still face technical bottlenecks: First, the aerator layout lacks directional control, resulting in dispersed airflow across the main chamber, which has limited ability to destroy local bridging structures in areas prone to bridging. Second, the exhaust system is often a fixed design, unable to dynamically adjust the exhaust rate based on aeration parameters. This can easily lead to powder recoil or uneven fluidization under high-pressure differential conditions. Third, the active arch-breaking component has a limited function, making it ineffective for treating sticky powders or those with severe bridging.

[0006] Therefore, it is necessary to provide a loss-in-weight feeder anti-bridging device based on powder fluidization technology to solve the above problems. Summary of the Invention

[0007] To solve the above problems, the present invention provides the following technical solutions: a loss-in-weight feeder anti-bridging device based on powder fluidization technology, comprising: a loss-in-weight feeder including a main bin and a silo located below the main bin; an anti-bridging component embedded in the side wall of the loss-in-weight feeder; Multiple aerators are distributed in the main compartment. The aerators are supplied with air by air pipes through the air nozzles thereon, and the on and off of the air pipes are controlled by solenoid valves; an exhaust assembly is arranged on the top of the main compartment; the solenoid valve and the exhaust assembly are both controlled by a controller, and the controller can control the exhaust parameters of the exhaust assembly to adapt to the aeration parameters of the aerators.

[0008] Preferably, the aerator is configured to aerate toward the anti-bridging component so as to achieve passive arch breaking by utilizing the anti-bridging component.

[0009] Preferably, the silo is U-shaped or hemispherical, and two symmetrically arranged aerators are provided in the silo.

[0010] Preferably, the exhaust assembly includes: an exhaust pipe, the bottom of which is connected to the main compartment, and the top of which is connected to an exhaust pipe, the exhaust pipe is connected to a three-way valve, and the three-way valve is respectively connected to a self-draining pipe and a suction pump; a screen fixed in the exhaust pipe; the controller can control the three-way valve to enable the exhaust pipe to achieve adaptive exhaust using the self-draining pipe, or to use the suction pump to achieve exhaust that is adapted to the aeration parameters of the aerator.

[0011] Preferably, a floating plate is slidingly provided inside the exhaust pipe and is located below the screen, and a floating spring is connected between the floating plate and the exhaust pipe; a plurality of through holes are provided on the floating plate, and elastic conical holes are embedded in the through holes, and the elastic conical holes tend to expand gradually from bottom to top; a reaming cylinder corresponding to the elastic conical hole is fixed to the bottom of the screen, and the side of the reaming cylinder has a side hole.

[0012] Preferably, the side wall of the loss-in-weight feeder is provided with a stepped through hole; the anti-bridging assembly comprises: a base, which is correspondingly embedded in the stepped through hole, and a sealing ring gasket and a sealing ring are provided between the base and the stepped through hole, and a groove body is provided at one end of the base facing the inner side of the loss-in-weight feeder; a composite membrane, which is connected to the notch of the groove body and forms a chamber together with the groove body; a pad, which is embedded in the groove body, and a support is provided between the pad and the composite membrane; an air supply head, which is used to supply air to the chamber or to extract air from the chamber.

[0013] Preferably, the support member is a support spring.

[0014] Preferably, the support member is a fixed-point support assembly, which includes: an inner cylinder, one end of which is fixed to the pad and the other end of which is slidably sleeved with an outer cylinder, forming a buffer connection between the outer cylinder and the inner cylinder; a bracket, which is fixed to the outer cylinder and is provided with multiple support plates.

[0015] Preferably, the composite membrane includes a contact layer, an antistatic layer, a skeleton layer, an airtight layer and seepage columns penetrating each layer sequentially pasted from the side close to the inside of the loss-in-weight feeder outward, wherein the seepage columns protrude from the contact layer and form bulges.

[0016] Preferably, the controller is further configured to: when the anti-bridging component is used to actively break the arch, control the air supply head to first pulse-inflate the chamber, then continuously apply pressure, and finally quickly pump air out.

[0017] Compared with the existing technology, the present invention provides a loss-in-weight feeder anti-bridging device based on powder fluidization technology, which has the following beneficial effects: In this method, an aerator injects gas into the powder in the main chamber, utilizing the fluidization effect to suspend some powder particles and generate shear force, disrupting the static structure of bridging. This is particularly suitable for mild bridging scenarios. Furthermore, the anti-bridging component actively intervenes through a combined action of "pulse inflation → continuous pressure → rapid air extraction" to ensure feeding continuity.

[0018] The controller dynamically adjusts the exhaust parameters of the exhaust assembly based on the aerator's aeration parameters, preventing excessive pressure or fluctuations in the main chamber. When the aeration volume increases, the controller switches the three-way valve to activate the suction pump for active exhaust, ensuring the exhaust rate matches the aeration flow rate. In low-pressure differential scenarios, the system uses a self-discharging pipe for adaptive exhaust, reducing energy consumption.

[0019] The composite membrane of the anti-bridging component in the present invention adopts a layered design, the contact layer has low friction and anti-adhesion, the antistatic layer avoids electrostatic adsorption of powder, and the skeleton layer provides mechanical strength to ensure stable deformation under air pressure drive; the seepage column protrudes from the contact layer to form a protrusion, and is embedded in the powder layer to enhance local disturbance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the three-dimensional structure of an anti-bridging device for a loss-in-weight feeder based on powder fluidization technology; Figure 2 This is a schematic plan view of the exhaust assembly in an anti-bridging device for a loss-in-weight feeder based on powder fluidization technology; Figure 3 A schematic diagram of the anti-bridging component in a loss-in-weight feeder anti-bridging device based on powder fluidization technology. Figure 1 ; Figure 4 A schematic diagram of the anti-bridging component in a loss-in-weight feeder anti-bridging device based on powder fluidization technology. Figure 2 ; Figure 5 for Figure 4 An enlarged structural diagram of the central fixed-point support assembly; Figure 6This is a schematic diagram of the planar structure of a composite membrane in an anti-bridging device of a loss-in-weight feeder based on powder fluidization technology; In the figure: 1. air nozzle; 2. aerator; 3. loss-in-weight feeder; 4. air pipe; 5. solenoid valve; 6. pressure regulating valve; 7. controller; 8. exhaust assembly; 9. anti-bridging assembly; 81. exhaust pipe; 82. exhaust pipe; 83. screen; 84. expansion cylinder; 85. floating plate; 86. floating spring; 87. elastic cone hole; 91. base; 92. sealing ring gasket; 93. composite membrane; 94. pad; 95. fixed-point support assembly; 96. support spring; 97. air supply head; 951. support plate; 952. bracket; 953. outer cylinder; 954. inner cylinder; 931. contact layer; 932. antistatic layer; 933. skeleton layer; 934. airtight layer; 935. seepage column. DETAILED DESCRIPTION

[0021] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned description of the drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, and this is merely a way of distinguishing the objects of the same attributes when describing them in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0022] Example 1: Please refer to Figure 1-Figure 3 、 Figure 6 In an embodiment of the present invention, an anti-bridging device for a loss-in-weight feeder based on powder fluidization technology is provided, comprising: a loss-in-weight feeder 3, comprising a main bin and a silo located below the main bin; an anti-bridging component 9, embedded in the side wall of the loss-in-weight feeder 3; a plurality of aerators 2, distributed in the main bin, the aerator 2 being supplied with air by an air pipe 4 through an air nozzle 1 thereon, and the on-off of the air pipe 4 being controlled by an electromagnetic valve 5, the electromagnetic valve 5 being also connected to a pressure regulating valve 6; an exhaust component 8, arranged at the top of the main bin; the electromagnetic valve 5 and the exhaust component 8 are both controlled by a controller 7, and the controller 7 can control the exhaust parameters of the exhaust component 8 to adapt to the aeration parameters of the aerator 2.

[0023] In this embodiment, gas is sprayed into the powder in the main bin through multiple aerators 2 distributed in the main bin, and some powder particles begin to suspend in the air flow, achieving a fluidization effect, and the air flow is used to generate shear force between the powder particles, and cooperate with the anti-bridging component 9 to destroy the static structure of the powder bridge, thereby achieving anti-bridging.

[0024] In addition, the exhaust assembly 8 at the top of the main chamber exhausts excess gas through the exhaust pipe 81. The controller 7 can dynamically adjust the exhaust parameters of the exhaust assembly 8 (such as the exhaust rate and exhaust volume) based on the aeration parameters of the aerator 2 (such as gas flow, pressure, or frequency). For example, when the aerator 2 increases the aeration volume, the controller 7 will control the exhaust assembly 8 to exhaust more quickly to prevent excessive pressure in the main chamber.

[0025] Furthermore, the aerator 2 is configured to aerate toward the anti-bridging component 9 so as to achieve passive arch breaking by utilizing the anti-bridging component 9 .

[0026] It's important to explain that aerator 2 sprays gas toward anti-bridging assembly 9. This directed airflow acts on the powder area near anti-bridging assembly 9, disrupting the powder's cohesive structure in that area. This process, triggered solely by the normal fluidization of aerator 2 without active control of anti-bridging assembly 9, constitutes "passive arch breaking." When powder bridging is minimal, the directed airflow is sufficient to disrupt the bridging structure.

[0027] Aerator 2, also known as air stone or air dispersion stone, is made of high-quality white corundum and brown corundum, sintered at high temperature (1300 degrees Celsius). It is durable and has good air dispersion properties. It is commonly used for aeration, oxygenation, and mixing operations in sewage treatment plants.

[0028] In addition, the anti-bridging assembly 9 can be installed at a position prone to bridging.

[0029] In this embodiment, the silo is U-shaped or hemispherical, and two symmetrically arranged aerators 2 are provided in the silo.

[0030] The bottom structure of a U-shaped or hemispherical silo can reduce dead corners where materials accumulate. The U-shaped silo has a relatively flat bottom, which is suitable for powders to slide naturally. The hemispherical silo has an arc-shaped bottom, which is suitable for sticky powders or materials that easily clump together. The arc structure reduces the adhesion of powders to the silo wall.

[0031] Two aerators 2 are symmetrically positioned within the silo to inject gas into the silo. This symmetrical layout ensures convection and uniform airflow within the silo, preventing bridging caused by localized insufficient fluidization. Furthermore, both the silo aerators 2 and the main silo aerators 2 are controlled by a controller 7. When the main silo aerator 2 activates fluidization, the silo aerators 2 can be synchronized to ensure continuous fluidization during powder transport from the main silo to the silo.

[0032] In this embodiment, the exhaust assembly 8 includes: an exhaust pipe 81, the bottom of which is connected to the main compartment, and the top of which is connected to an exhaust pipe 82, the exhaust pipe 82 is connected to a three-way valve, and the three-way valve is respectively connected to a self-draining pipe and a suction pump; a blocking net 83 is fixed in the exhaust pipe 81; the controller 7 can control the three-way valve to enable the exhaust pipe 81 to achieve adaptive exhaust using the self-draining pipe, or to use the suction pump to perform exhaust that is adapted to the aeration parameters of the aerator 2.

[0033] In this embodiment, when the aeration volume of the aerator 2 is large (such as pulse aeration or high flow conditions), the controller 7 switches the three-way valve to allow the gas to be actively extracted through the exhaust pipe 82 → suction pump, ensuring that the exhaust rate is synchronized with the aeration parameters (such as flow rate and pressure) to avoid excessive air pressure in the main chamber.

[0034] The blocking net 83 fixed in the exhaust pipe 81 can intercept the powder particles that may be carried in the main bin.

[0035] The three-way valve can be an electric three-way ball valve or a pneumatic three-way butterfly valve.

[0036] The suction pump may be a centrifugal suction pump or a vacuum pump.

[0037] In this embodiment, a floating plate 85 is slidingly provided inside the exhaust pipe 81 and is located below the blocking net 83. A floating spring 86 is connected between the floating plate 85 and the exhaust pipe 81. A plurality of through holes are provided on the floating plate 85, and elastic conical holes 87 are embedded in the through holes. The elastic conical holes 87 tend to expand gradually from bottom to top. A reaming tube 84 corresponding to the elastic conical hole 87 is fixed to the bottom of the blocking net 83, and the side of the reaming tube 84 has a side hole.

[0038] Floating plate 85 is suspended within exhaust pipe 81 by floating spring 86, located below screen 83. When gas from the main chamber enters exhaust pipe 81, the airflow pushes floating plate 85 up and down. The elastic tapered holes 87 (narrow at the bottom and wide at the top) on floating plate 85 initially restrict the passage of dust particles. When aerator 2 activates high-flow aeration, floating plate 85 moves upward, and elastic tapered holes 87 expand, ensuring smooth exhaust.

[0039] In this embodiment, the side wall of the loss-in-weight feeder 3 is provided with a stepped through hole; the anti-bridging component 9 includes: a base 91, which is correspondingly embedded in the stepped through hole, and a sealing ring gasket 92 and a sealing ring are provided between the base 91 and the stepped through hole, and a groove is provided at one end of the base 91 facing the inner side of the loss-in-weight feeder 3; a composite membrane 93, which is connected to the notch of the groove body and forms a chamber together with the groove body; a pad 94, which is embedded in the groove body, and a support is provided between the pad 94 and the composite membrane 93; an air supply head 97, which is used to supply air to the chamber or extract air from the chamber.

[0040] The controller 7 is further configured to: when the anti-bridging component 9 is used to actively break the arch, control the air supply head 97 to first pulse-inflate the chamber, then continuously apply pressure, and finally quickly pump air out.

[0041] The air supply head 97 is connected to the chamber and changes the air pressure within the chamber by inflating or deflating. When active arch breaking is required, the controller 7 controls the air supply head 97 in the sequence of "pulse inflation → continuous pressure → rapid deflating." Specifically, high-pressure gas is rapidly introduced into the chamber, causing the composite membrane 93 to expand instantaneously. This impacts the adjacent powder bridging area, destroying the static structure of the bridge (such as friction and adhesion between the powders). The air pressure within the chamber is then maintained, keeping the composite membrane 93 in an expanded state. The bridging area is continuously compressed to prevent the bridge from reforming (this is particularly applicable to sticky powders or loose bridges). Finally, the air in the chamber is suddenly evacuated, causing the composite membrane 93 to rapidly retract, generating negative pressure or mechanical vibration, further disturbing the powder layer and ensuring the complete destruction of the bridge.

[0042] In this embodiment, the support member is a support spring 96. The support spring 96 is connected between the pad 94 and the composite membrane 93. Its core function is to maintain the initial shape of the composite membrane 93 and adapt to the air pressure-driven deformation. Specifically, when the air supply head 97 inflates the chamber, the air pressure in the chamber increases, and the composite membrane 93 is compressed to expand outward (inside the feeder). At this time, the support spring 96 is stretched, providing a reverse elastic force to prevent the composite membrane 93 from being damaged due to excessive stretching; at the same time, the compression of the spring is proportional to the air pressure, ensuring that the deformation amplitude of the composite membrane 93 is controllable. When the air supply head 97 is depressurized, the air pressure in the chamber drops sharply, and the composite membrane 93 needs to retract to its initial shape. The elastic potential energy of the support spring 96 is released, pushing the composite membrane 93 to quickly reset. In addition, it can prevent the composite membrane 93 from collapsing or adhering to the trough body due to excessively low air pressure, which affects the response speed of the next arch-breaking action.

[0043] The composite membrane 93 includes a contact layer 931, an antistatic layer 932, a skeleton layer 933, an airtight layer 934 and a seepage column 935 that penetrates each layer, which are sequentially pasted from the side close to the inside of the loss-in-weight feeder 3 to the outside. The seepage column 935 protrudes from the contact layer 931 and forms a bulge.

[0044] Among them, the contact layer 931 is in direct contact with the powder and needs to have low friction and wear resistance (such as polytetrafluoroethylene or nylon material) to reduce powder adhesion; the antistatic layer 932 prevents the powder from being adsorbed on the surface of the composite membrane 93 due to static electricity (such as polyester fiber or conductive rubber material), and is especially suitable for fine powders that are prone to static electricity (such as plastic particles, pharmaceutical powders), to avoid secondary bridging caused by static electricity; the skeleton layer 933 provides mechanical strength (such as glass fiber reinforced plastic or metal mesh) to ensure that the composite membrane 93 is stably deformed under air pressure drive to avoid rupture or uncontrolled deformation due to insufficient strength; the airtight layer 934 ensures the sealing of the chamber (such as rubber or silicone material) to prevent gas leakage during inflation / deflating and ensure the air pressure drive effect.

[0045] The seepage column 935 penetrates each layer and protrudes from the contact layer 931. Its functions include: the seepage column 935 protrudes from the contact layer 931 to form a bulge, which can be embedded in the powder layer to enhance the local disturbance effect (such as "puncturing" the bridging structure); when the chamber is inflated, the high-pressure gas can penetrate into the powder layer through the micropores of the seepage column 935, forming local microfluidization, and assisting the mechanical expansion and arch breaking of the composite membrane 93.

[0046] Example 2: Please refer to Figure 4 and Figure 5 , which is different from the first embodiment in that the support member is a fixed-point support assembly 95, which includes: an inner cylinder 954, one end of which is fixed on the pad 94, and the other end of which is slidably sleeved with an outer cylinder 953, and a buffer connection is formed between the outer cylinder 953 and the inner cylinder 954; a bracket 952, which is fixed on the outer cylinder 953, and a plurality of support plates 951 are provided on the bracket 952.

[0047] The inner cylinder 954 is fixed to the backing plate 94, and the outer cylinder 953 is slidably mounted outside the inner cylinder 954, forming a telescopic buffer structure. Multiple support plates 951 disperse the deformation pressure of the composite membrane 93 over a larger area, avoiding localized excessive extrusion caused by single-point support.

[0048] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A loss-in-weight feeder anti-bridging device based on powder fluidization technology, characterized in that: include: A loss-in-weight feeder (3) comprising a main bin and a hopper located below the main bin; An anti-bridging component (9) embedded in the side wall of the loss-in-weight feeder (3); A plurality of aerators (2) are distributed in the main chamber, the aerators (2) are supplied with air by an air pipe (4) through an air nozzle (1) thereon, and the air pipe (4) is controlled to be on and off by an electromagnetic valve (5); An exhaust assembly (8) is arranged on the top of the main compartment; The solenoid valve (5) and the exhaust assembly (8) are both controlled by a controller (7), and the controller (7) is capable of controlling the exhaust parameters of the exhaust assembly (8) to adapt to the aeration parameters of the aerator (2).

2. The anti-bridging device for a loss-in-weight feeder based on powder fluidization technology according to claim 1, characterized in that: The aerator (2) is configured to be able to aerate in the direction of the anti-bridging component (9) so as to achieve passive arch breaking by utilizing the anti-bridging component (9).

3. The anti-bridging device for a loss-in-weight feeder based on powder fluidization technology according to claim 1, characterized in that: The silo is U-shaped or hemispherical, and is provided with two symmetrically arranged aerators (2).

4. The anti-bridging device for a loss-in-weight feeder based on powder fluidization technology according to claim 1, characterized in that: The exhaust assembly (8) comprises: An exhaust pipe (81) is connected to the main chamber at the bottom and is connected to an exhaust pipe (82) at the top. The exhaust pipe (82) is connected to a three-way valve, and the three-way valve is respectively connected to a self-exhaust pipe and a suction pump; A screen (83) is fixed in the exhaust pipe (81); The controller (7) can control the three-way valve to enable the exhaust pipe (81) to achieve adaptive exhaust using a self-exhausting pipe, or to use the suction pump to perform exhaust that is adapted to the aeration parameters of the aerator (2).

5. The anti-bridging device for a loss-in-weight feeder based on powder fluidization technology according to claim 4, characterized in that: A floating plate (85) is slidably provided inside the exhaust pipe (81) and is located below the blocking net (83). A floating spring (86) is connected between the floating plate (85) and the exhaust pipe (81). A plurality of through holes are provided on the floating plate (85), and elastic conical holes (87) are embedded in the through holes. The elastic conical holes (87) gradually expand from bottom to top. A reaming cylinder (84) corresponding to the elastic tapered hole (87) is fixed to the bottom of the barrier (83), and a side hole is provided on the side of the reaming cylinder (84).

6. The anti-bridging device for a loss-in-weight feeder based on powder fluidization technology according to claim 1, characterized in that: The side wall of the loss-in-weight feeder (3) is provided with a stepped through hole; The anti-bridging component (9) comprises: A base (91) is correspondingly embedded in the stepped through hole, and a sealing ring gasket (92) and a sealing ring are provided between the base (91) and the stepped through hole, and a groove is provided at one end of the base (91) facing the inner side of the loss-in-weight feeder (3); A composite membrane (93) is connected to the notch of the trough body and forms a chamber together with the trough body; A backing plate (94) is embedded in the tank body, and a support member is provided between the backing plate (94) and the composite membrane (93); The gas supply head (97) is used to supply gas to the chamber or to extract gas from the chamber.

7. The anti-bridging device for a loss-in-weight feeder based on powder fluidization technology according to claim 6, characterized in that: The support member is a support spring (96).

8. The anti-bridging device for a loss-in-weight feeder based on powder fluidization technology according to claim 6, characterized in that: The support member is a fixed-point support assembly (95), and the fixed-point support assembly (95) comprises: An inner cylinder (954) is fixed on the backing plate (94) at one end and is slidably sleeved with an outer cylinder (953) at the other end, forming a buffer connection between the outer cylinder (953) and the inner cylinder (954); The bracket (952) is fixed on the outer cylinder (953), and a plurality of support plates (951) are provided on the bracket (952).

9. The anti-bridging device for a loss-in-weight feeder based on powder fluidization technology according to claim 6, characterized in that: The composite film (93) includes a contact layer (931), an antistatic layer (932), a skeleton layer (933), an airtight layer (934), and a seepage column (935) that penetrates each layer and is adhered in sequence from the side close to the inside of the loss-in-weight feeder (3) to the outside. The seepage column (935) protrudes from the contact layer (931) and forms a bulge.

10. The anti-bridging device for a loss-in-weight feeder based on powder fluidization technology according to claim 6, characterized in that: The controller (7) is further configured to: when the anti-bridging component (9) is used to actively break the arch, control the air supply head (97) to first pulse-charge the chamber, then continuously apply pressure, and finally quickly pump air.

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