Anti-sticking powder screw conveyor and conveying method

Abstract

The present application relates to a kind of powder screw conveyors of anti-sticking material and conveying method, belong to powder screw conveying field.A kind of powder screw conveyor of anti-sticking material, including support base frame and the inclinedly arranged conveying groove body of installation on support base frame, the lower end of the conveying groove body is provided with hopper, upper end is provided with discharge cylinder, the conveying groove body is rotated in there by power driven structure driven spiral feed rod, the spiral feed rod is axially slid with the loose material rod synchronous rotation of on, the hopper is provided with the drive assembly for driving loose material rod axially sliding on spiral feed rod, the present application is provided with loose material rod, when powder appears synchronous rotation tendency, loose material rod is axially moved under the push of drive assembly, utilizes the strong cohesive force between physical damage powder of breakage surface and push material wing board, the formation basis of breakage layer is destroyed, ensure that powder can be always pushed forward by spiral blade, significantly improve the stability and efficiency of conveying.

Description

Technical Field

[0001] This invention relates to the field of powder screw conveying technology, and in particular to a powder screw conveyor and conveying method for preventing material sticking. Background Technology

[0002] High-purity optical coating powders such as silicon monoxide, zinc sulfide, indium tin oxide, titanium pentoxide, tantalum pentoxide, and hafnium dioxide are key raw materials in the optical coating industry. Because these powders are mostly submicron in size, they have a very large specific surface area. Influenced by intermolecular forces such as van der Waals forces and electrostatic forces, the powders exhibit extremely strong cohesiveness and adhesion. When using a traditional inclined screw conveyor for lifting operations, the powder may form an arched bridging phenomenon in the hopper due to cohesive forces, hindering the powder from falling smoothly into the conveying trough, resulting in unstable or even interrupted feeding. Secondly, the powder is very easy to adhere to the surface of the screw conveyor rod and the central shaft, gradually forming a dense shaft-clamping layer. When the shaft-clamping layer thickens, the friction between the powder and the screw blades is less than the internal cohesive force of the powder and the friction between the powder and the casing. The powder no longer moves forward with the screw blades, but rotates synchronously with the screw shaft, resulting in a sharp drop in conveying efficiency or even failure. Meanwhile, when the bridging structure inside the hopper is broken manually or mechanically, a large amount of accumulated powder will collapse instantly and pile up at the inlet of the screw conveyor. This instantaneous overload further aggravates the powder's wrapping and adhesion to the screw shaft, causing the shaft-clamping phenomenon to deteriorate rapidly and forming a vicious cycle. Summary of the Invention

[0003] Therefore, it is necessary to provide a powder screw conveyor and conveying method for preventing material sticking in order to address the above-mentioned technical problems.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A powder screw conveyor for preventing material sticking includes a support frame and a conveying trough mounted on the support frame at an incline. The lower end of the conveying trough is provided with a feeding hopper and the upper end is provided with a discharging cylinder. A screw conveying rod driven by a power drive structure rotates inside the conveying trough. A material distribution rod that rotates synchronously with the screw conveying rod slides axially on the screw conveying rod. The feeding hopper is provided with a drive assembly for driving the material distribution rod to slide axially on the screw conveying rod.

[0005] Preferably, the maximum slewing diameter of the bulk material rod is smaller than the outer diameter of the blades of the screw conveyor.

[0006] Furthermore, the driving component is a rotating support shaft driven by a rotary motor, the rotating support shaft is rotatably connected to the feeding hopper, and a lever is fixedly connected to the rotating support shaft. The lever is used to push the material bar to move when it comes into contact with the material bar. A mounting plate is provided on the material bar, and a return spring is provided between the mounting plate and the conveying trough.

[0007] Furthermore, the mounting plate is provided with a sliding guide groove, and the spiral conveyor rod is provided with a sliding guide block. The mounting plate is sleeved inside the sliding guide block through the sliding guide groove.

[0008] Furthermore, a shaking shaft is rotatably connected inside the feeding hopper. Multiple shaking rods are fixedly connected to the upper end of the shaking shaft, and a drive shaft is fixedly connected to the lower end of the shaking shaft. When the lever is rotated to the top, it is used to strike the drive shaft to make the shaking shaft rotate.

[0009] Optionally, the tail of the shaking rod is bent.

[0010] Preferably, the levers are arranged in an even number symmetrically.

[0011] Furthermore, the material handling rod is provided with a breaking surface, a guiding surface, and a pushing wing plate in sequence along the material conveying direction, wherein the two pushing wing plates are arranged with an opening between them.

[0012] Furthermore, the material handling rod is provided with multiple guide plates at an angle.

[0013] A method for conveying powder using an anti-sticking screw conveyor, comprising an anti-sticking screw conveyor for powder, mainly including the following steps: Step 1: Equipment Start-up and Preparation; Step 2: Powder feeding; Step 3: Screw conveying of powder; The rotation of the screw conveyor pushes the powder on its initial section upward along the conveying trough. The material distribution rod rotates synchronously with the screw conveyor. When the rotating lever is rotated to the lower position, its end abuts against the end of the material distribution rod. The lever pushes the material distribution rod to slide axially, and the sliding of the material distribution rod squeezes and disperses the powder in front of it. When the lever disengages from the end of the material handling rod, the material handling rod quickly returns to its initial position under the elastic force of the return spring. Step 4: Steady feeding and conveying of powder.

[0014] Compared with the prior art, the present invention provides a powder screw conveyor and conveying method for preventing material sticking, which has the following beneficial effects: This invention features a material distribution rod that rotates synchronously with the screw conveyor and can slide axially. When the powder exhibits a synchronous rotational tendency, the material distribution rod moves axially under the drive of the drive assembly. It directly squeezes, cuts, and disperses the agglomerated powder on and around the screw shaft surface using the crushing surface and pusher blades. This physically destroys the strong cohesive force between the powder particles, disrupts the foundation for the formation of the shaft-holding layer, and ensures that the powder can always be pushed forward by the screw blades, significantly improving the stability and efficiency of the conveying process.

[0015] During the rotation of the lever, the present invention drives the material dispersing rod to slide and crush the powder clinging to the shaft, while simultaneously striking the drive shaft of the shaking shaft, causing the shaking rod in the feeding hopper to vibrate at high frequency. This continuously disturbs the powder in the feeding hopper, destroys its static structure, and effectively prevents bridging.

[0016] This invention provides high-frequency impact through a dual-lever structure. When a large amount of powder falls instantly, the sliding material dispersing rod can immediately disperse and guide the accumulated powder, preventing excessive accumulation of powder at the inlet. During resetting, the pusher wing actively propels the powder forward, avoiding the formation of a dense compacted layer between new and old powder at the inlet, greatly enhancing the equipment's ability to cope with complex working conditions. Attached Figure Description

[0017] Figure 1 This is the front view of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is a side view of the present invention; Figure 4 This is an isometric view of the present invention; Figure 5 This is a cross-sectional view of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of section A in the middle; Figure 7 This is a schematic diagram of the material handling rod in this invention; Figure 8 This is a schematic diagram of the material shaking rod in this invention; Figure 9 This is a schematic diagram of the installation disk in this invention; Figure 10 This is a schematic cross-sectional view of the material handling rod in this invention.

[0018] In the diagram: 1. Conveying trough; 101. Support frame; 102. Feeding hopper; 103. Feeding cylinder; 104. Power drive structure; 105. Screw conveyor; 106. Sliding guide block; 2. Dispersing rod; 201. Crushing surface; 202. Guide surface; 203. Pusher wing plate; 204. Guide push plate; 205. Mounting plate; 206. Sliding guide groove; 207. Return spring; 3. Rotary motor; 301. Rotating support shaft; 302. Pulley; 4. Shaking shaft; 401. Shaking rod; 402. Drive shaft. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0020] Example 1: A powder screw conveyor for preventing sticking, as described in the reference. Figure 1 , Figure 2 , Figure 3 , Figure 4 The system mainly includes a support frame 101 and a conveying trough 1 inclinedly mounted on the support frame 101. A feeding hopper 102 is located at the lower end of the conveying trough 1, and a discharging cylinder 103 is located at the upper end. A spiral conveying rod 105, driven by a power drive structure 104, rotates within the conveying trough 1. High-purity optical coating powders, such as silicon monoxide, zinc sulfide, indium tin oxide, titanium pentoxide, tantalum pentoxide, and hafnium dioxide, are added through the feeding hopper 102 and conveyed along the conveying trough 1 by the spiral conveying rod 105 to the discharging cylinder 103 at a higher position, thus achieving the conveying of high-purity optical coating powders from low to high. However, the high purity... Optical coating powders are mostly submicron in size. Due to intermolecular forces, the powders have strong cohesive forces, which makes them prone to bridging in the feeding hopper 102, affecting the feeding speed. At the same time, the powders will also adhere to the surface of the screw conveyor 105, forming a binding layer. When the adhesion force exceeds the friction between the powder and the housing, the powder and the screw conveyor 105 will lock together and rotate synchronously, preventing the powder from being fed smoothly. Furthermore, when bridging occurs, the bridging structure needs to be broken. At this time, a large amount of powder will fall instantly at the inlet of the screw conveyor 105, which will further aggravate the formation of the binding layer and affect the feeding efficiency.

[0021] Therefore, refer to Figure 5 , Figure 6 , Figure 7 , Figure 9In this invention, a material distribution rod 2 is slidably mounted on a screw conveyor 105 and rotates synchronously with the screw conveyor 105. The pitch of the material distribution rod 2 is the same as that of the screw conveyor 105, and the maximum rotation diameter of the material distribution rod 2 is smaller than the outer diameter of the blades of the screw conveyor 105. A driving assembly is provided on the feeding hopper 102 to drive the material distribution rod 2 to slide axially on the screw conveyor 105. When the powder on the screw conveyor 105 appears or is about to appear in synchronous rotation with the screw conveyor 105, the axially sliding material distribution rod 2 can squeeze and disperse the middle part of the powder, destroy the strong cohesion between the powder particles, so that the powder can be conveyed upward by the screw conveyor 105.

[0022] In one specific implementation, refer to Figure 5 , Figure 6 , Figure 9 The driving component is a rotating support shaft 301 driven by a rotary motor 3. The rotating support shaft 301 is rotatably connected to the feeding hopper 102, and a lever 302 is fixedly connected to the rotating support shaft 301. Figure 6 As shown, when the lever 302 rotates to the lower position, it abuts against the end of the material feed rod 2. When the screw conveyor rod 105 rotates clockwise, it pushes the powder upward. If the lever 302 is stationary, the material feed rod 2, which rotates with the screw conveyor rod 105, will slide to the left due to its own spiral state, thus breaking up the powder. It should be noted that if the screw conveyor rod 105 continues to rotate, the back of the blades of the screw conveyor rod 105 will interfere with the lever 302. Therefore, the lever 302 will also rotate clockwise. After rotation, the lever 302 will avoid the back of the screw conveyor rod 105 and separate from the material feed rod 2. At this time, there will be no motion interference, and the relative displacement speed between the material feed rod 2 and the lever 302 will increase, thereby increasing the axial displacement efficiency of the material feed rod 2 and improving the separation effect of the powder.

[0023] Among them, reference Figure 5 An installation plate 205 is provided in the direction of the non-conveying end of the bulk material rod 2. A return spring 207 is provided between the installation plate 205 and the conveying trough 1. When the lever 302 contacts the bulk material rod 2, the return spring 207 is compressed by the sliding of the bulk material rod 2. When the lever 302 separates from the bulk material rod 2, the return spring 207 pushes the bulk material rod 2 back to its original position, so as to periodically disperse the powder.

[0024] The reset spring 207 and the mounting plate 205 are located at the lower end of the conveying trough 1.

[0025] In one specific embodiment, in order to prevent relative rotation between the screw conveyor 105 and the bulk material rod 2, that is, to ensure that the bulk material rod 2 rotates with the screw conveyor 105, a sliding guide groove 206 is provided on the mounting plate 205, and a sliding guide block 106 is provided on the screw conveyor 105. The mounting plate 205 is sleeved in the sliding guide block 106 through the sliding guide groove 206.

[0026] In one specific embodiment, in order to prevent bridging within the feeding hopper 102, refer to Figure 5 , Figure 8 A shaking shaft 4 is rotatably connected inside the feeding hopper 102. Multiple shaking rods 401 are fixedly connected to the upper end of the shaking shaft 4, and a drive shaft 402 is fixedly connected to the lower end of the shaking shaft 4. When the lever 302 is rotated to the upper position, it will strike the drive shaft 402 to make the shaking shaft 4 rotate, thereby causing the upper shaking rods 401 to fluctuate and disturb the powder in the feeding hopper 102 to prevent bridging.

[0027] In one specific implementation, refer to Figure 8 The tail of the shaking rod 401 is bent and has a certain elasticity. It can be bent when it is pushed by the lever 302. When the lever 302 leaves the drive shaft 402, it can elastically return to its original position and drive the drive shaft 402 and the shaking rod 401 to vibrate and shake the material.

[0028] In one specific implementation, refer to Figure 8 , Figure 9 The levers 302 are arranged in an even number of symmetrical positions, such as Figure 8 As shown, the lever 302 is provided in two sets, so that the lever 302 can drive the drive shaft 402 and the material dispersing rod 2 at the same time, so that the bridging action and the powder crushing action are carried out simultaneously. When the powder falls, the material dispersing rod 2 is in a sliding state in the conveying direction, and the falling powder is dispersed by the material dispersing rod 2, thereby improving the conveying stability of the screw conveyor 105.

[0029] In this system, the rotational speed of the power drive structure 104 is twice the rotational speed of the rotary motor 3, and N represents the number of levers 302. Figure 8 When there are two sets of levers 302, the rotation speed is doubled to ensure that the material handling rod 2 can slide when the lever 302 moves down.

[0030] The dual levers 302 are arranged with a 180° phase difference, forming two high-frequency axial impacts on the dispersing rod 2 within one rotation cycle. This can more thoroughly destroy the agglomeration structure formed by strong cohesion inside the powder, effectively preventing the powder from adhering to the surface of the screw conveyor rod 105 and forming a shaft-clamping layer. At the same time, the intermittent high-frequency impact of the dual levers 302 on the drive shaft 402 causes the shaking rod 401 to generate continuous high-frequency micro-amplitude vibrations, which can continuously destroy the adhesion phenomenon between powders in the feeding hopper 102. This not only solves the bridging problem, but also prevents the powder from instantly accumulating at the inlet of the screw conveyor rod 105 after the bridging collapses, thus aggravating the shaft-clamping phenomenon.

[0031] In one specific implementation, refer to Figure 10 The material dispersing rod 2 is sequentially provided with a crushing surface 201, a guiding surface 202, and a pushing wing plate 203 along the conveying direction. The two pushing wing plates 203 are set with an opening between them. When the material dispersing rod 2 is squeezed and slid by the lever 302, the cross-section of the crushing surface 201 is conical, which can better break through the squeezed and agglomerated powder. The guiding surface 202 is used to guide the powder to both sides, and the area where the pushing wing plate 203 moves is an empty groove. The powder guided by the guiding surface 202 will fall into the opening in front of the pushing wing plate 203 and scatter, which improves the dispersion effect of the powder. When the lever 302 is disengaged from the material dispersing rod 2, when the material dispersing rod 2 is reset by the elastic force of the return spring 207, the pushing wing plate 203 on the lower part of the material dispersing rod 2 will push the powder forward, so that the powder gradually leaves the bottom of the feed hopper 102, preventing the accumulation of newly fallen powder, reducing powder agglomeration, and reducing the generation of shaft-clamping layer.

[0032] In one specific implementation, refer to Figure 8 Multiple guide plates 204 are provided on the material dispersing rod 2. When the material dispersing rod 2 slides, the guide plates 204 can cut the powder. The guide plates 204 are inclined and the inclination direction is the same as the spiral direction of the material dispersing rod 2. This allows the cut powder to slide and disperse along the surface of the guide plates 204, thereby improving the dispersion effect of the powder.

[0033] Among them, the end of the guide plate 204 away from the material dispersing rod 2 is in contact with the central axis of the screw conveyor rod 105. When sliding, the guide plate 204 can not only stabilize the posture of the material dispersing rod 2, that is, prevent the material dispersing rod 2 from being deflected by pressure and prevent the material dispersing rod 2 from shaking, but also scrape off the shaft-clamping layer on the surface of the central axis of the screw conveyor rod 105, reducing the generation of the powder shaft-clamping layer. Furthermore, the part that is not scraped off by the guide plate 204 will be dislodged and dispersed by the pressure of the powder pushed out by the guide plate 204, thereby improving the powder conveying efficiency.

[0034] Example 2: A method for conveying powder using a screw conveyor to prevent sticking mainly includes the following steps: Step 1: The power drive structure 104 starts to operate, driving the screw conveyor 105 to rotate in the conveying trough 1 in the set direction. At the same time, the rotary motor 3 starts, driving the rotating support shaft 301 and the double lever 302 installed on it to rotate at the set speed. The return spring 207 is in the free state, pushing the material bar 2 to the lower end of the conveying trough 1. At this time, the end of the material bar 2 separates from the lever 302 above.

[0035] Step 2: High-purity optical coating powder is added through the feeding hopper 102. The powder falls to the bottom of the feeding hopper 102 and accumulates at the beginning of the screw conveyor 105. During the falling process, the rotating lever 302 periodically rotates to the upper position, and its end strikes the drive shaft 402 at the lower end of the shaking shaft 4. The drive shaft 402 is driven by the strike to rotate the shaking shaft 4 and the shaking rod 401 at the upper end. The tail of the shaking rod 401 is arc-shaped and elastic. It bends when it is turned and elastically returns to its original position after leaving the lever 302, generating high-frequency micro-amplitude vibration. This vibration is transmitted to the powder in the feeding hopper 102, continuously breaking the strong cohesive force between the powder particles, effectively preventing the powder from forming a bridging structure on the hopper wall or at the outlet, and ensuring that the powder can fall smoothly to the screw conveyor 105.

[0036] Step 3: The rotation of the screw conveyor 105 pushes the powder on its initial section upward along the conveying trough 1. Since the material bar 2 cooperates with the sliding guide block 106 on the screw conveyor 105 through the sliding guide groove 206 on the mounting plate 205, the material bar 2 and the screw conveyor 105 rotate synchronously, but can slide along the axial direction. When the powder is being conveyed normally, the material bar 2 is in the initial position under the action of the return spring 207. Its maximum rotation diameter is smaller than the outer diameter of the screw blade, so it does not directly interfere with the normal conveying flow of the powder.

[0037] When the rotating lever 302 is rotated to the lower position, its end abuts against the end of the material dispersing rod 2. Since the screw conveyor rod 105 and the lever 302 rotate in the same direction, and the lever 302 rotates at a slower speed, the lever 302 pushes the material dispersing rod 2 to slide axially. During this process, the return spring 207 is compressed. The sliding of the material dispersing rod 2 squeezes and disperses the powder in front of it.

[0038] Among them, the breaking surface 201 effectively breaks through the dense agglomerates or preliminary shaft-clamping layer formed by cohesion; the guiding surface 202 guides the dispersed powder to both sides to avoid accumulation in the center; the opening area in front of the pusher wing plate 203 further disperses the powder and pushes the powder forward when the dispersing rod 2 is reset to prevent the powder from accumulating at the inlet; the inclined setting of the guide push plate 204 can cut the powder and guide its dispersion, and its inner end is close to the central axis of the spiral conveyor rod 105, scraping off the powder that may stick to the shaft during the sliding process, preventing the formation of the shaft-clamping layer from the source, and stabilizing the posture of the dispersing rod 2.

[0039] As the rotating support shaft 301 continues to rotate, the lever 302 disengages from the end of the material dispersing rod 2. Under the elastic force of the return spring 207, the material dispersing rod 2 quickly returns to its initial position, completing one working cycle. Due to the 180° symmetrical arrangement of the double levers 302, the material dispersing rod 2 will be subjected to two high-frequency axial impacts and resets within one rotation cycle, achieving periodic, high-frequency powder dispersing and axial surface cleaning.

[0040] Step 4: Simultaneously strike the drive shaft 402 above to prevent bridging and push the material distribution rod 2 below to prevent shaft seizure. When the powder falling from the hopper 102 due to the anti-bridging vibration reaches the inlet of the screw conveyor 105, the material distribution rod 2 is just about to perform an axial dispersing action, instantly dispersing the newly fallen powder that may accumulate and pushing it forward. This completely avoids the risk of powder instantly accumulating and aggravating the shaft seizure phenomenon. The dispersed powder falls back onto the blades of the screw conveyor 105 and is smoothly and continuously conveyed by the rotating blades to the discharge cylinder 103 at the top for discharge, achieving anti-sticking, anti-bridging, and stable lifting and conveying of high-purity optical coating powder.

Claims

1. A screw conveyor for preventing sticking of powder materials, characterized in that, The device includes a support frame (101) and a conveying trough (1) installed on the support frame (101) at an incline. The lower end of the conveying trough (1) is provided with a feeding hopper (102) and the upper end is provided with a feeding cylinder (103). A spiral conveying rod (105) driven by a power drive structure (104) rotates inside the conveying trough (1). The device is characterized in that a bulk material rod (2) that rotates synchronously with the spiral conveying rod (105) slides axially on the spiral conveying rod (105). A drive assembly for driving the bulk material rod (2) to slide axially on the spiral conveying rod (105) is provided on the feeding hopper (102).

2. The powder screw conveyor for preventing sticking of materials according to claim 1, characterized in that, The maximum slewing diameter of the bulk material rod (2) is smaller than the outer diameter of the blade of the screw conveyor rod (105).

3. The powder screw conveyor for preventing sticking of materials according to claim 2, characterized in that, The driving component is a rotating support shaft (301) driven to rotate by a rotary motor (3). The rotating support shaft (301) is rotatably connected to the feeding hopper (102). A lever (302) is fixedly connected to the rotating support shaft (301). The lever (302) is used to push the material bar (2) to move when it comes into contact with the material bar (2). An installation plate (205) is provided on the material handling rod (2), and a return spring (207) is provided between the installation plate (205) and the conveying trough (1).

4. The anti-sticking powder screw conveyor according to claim 3, characterized in that, The mounting plate (205) is provided with a sliding guide groove (206), and the spiral conveyor rod (105) is provided with a sliding guide block (106). The mounting plate (205) is sleeved in the sliding guide block (106) through the sliding guide groove (206).

5. A powder screw conveyor for preventing sticking of materials according to claim 3, characterized in that, The feeding hopper (102) is rotatably connected to a shaking shaft (4). The upper end of the shaking shaft (4) is fixedly connected to multiple shaking rods (401), and the lower end of the shaking shaft (4) is fixedly connected to a drive shaft (402). When the lever (302) rotates to the top, it is used to strike the drive shaft (402) to make the shaking shaft (4) rotate.

6. A powder screw conveyor for preventing sticking of materials according to claim 5, characterized in that, The tail of the shaking rod (401) is bent.

7. A powder screw conveyor for preventing sticking of materials according to claim 5, characterized in that, The levers (302) are arranged in pairs symmetrically.

8. A powder screw conveyor for preventing sticking of materials according to claim 3, characterized in that, The material handling rod (2) is provided with a breaking surface (201), a guiding surface (202), and a pushing wing plate (203) in sequence along the material conveying direction, wherein the two pushing wing plates (203) are arranged with an opening between them.

9. A powder screw conveyor for preventing sticking of materials according to claim 8, characterized in that, Multiple guide plates (204) are inclinedly arranged on the bulk rod (2).

10. A method for conveying powder using an anti-sticking screw conveyor, comprising the anti-sticking powder screw conveyor as described in claim 7, characterized in that, The main steps include: Step 1: Equipment Start-up and Preparation; Step 2: Powder feeding; Step 3: Screw conveying of powder; The rotation of the spiral conveyor (105) pushes the powder on its initial section upward along the conveying trough (1). The material bar (2) rotates synchronously with the spiral conveyor (105). When the rotating lever (302) rotates to the lower position, its end abuts against the end of the material bar (2). The lever (302) pushes the material bar (2) to slide axially. The sliding of the material bar (2) squeezes and disperses the powder in front of it. When the lever (302) disengages from the end of the material handling rod (2), the material handling rod (2) quickly returns to its initial position under the elastic force of the return spring (207). Step 4: Steady feeding and conveying of powder.

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