A raw material pretreatment mixing device for producing mica paper

Abstract

This invention relates to the field of mica paper raw material mixing technology, specifically to a raw material pretreatment mixing device for producing mica paper. It includes a mixing tank, a support, a discharge pipe, a feed pipe, and a stirring device. A flow-expanding mechanism is slidably arranged on the longitudinal direction of the inner wall of the mixing tank. Several flow-expanding mechanisms are arranged in a counter-clockwise circular array. Each flow-expanding mechanism includes a floating mechanism, a flared block, and a flow-expanding plate. The flow-expanding plate is fixed to the flared block, and the two sides of the flared block form a water-facing surface and a water-repellent surface, respectively. When the liquid level on the water-facing surface exceeds the lower edge of the upper arc surface of the flared block, the solution on the water-facing surface is split into two streams by the flow-expanding plate and flows out from the upper edge. One stream flows out from the upper edge and plunges down to the central area where the solution is relatively flat, while the other stream peels off the mica flakes attached to the inner wall of the water-repellent surface of the mixing tank and impacts the solution at the wall-attached area. This reduces the adhesion of mica flakes to the inner wall of the mixing tank, improves the fluidity of the solution at the wall-attached area, and increases the mixing degree between the mica flakes and the solution.

Description

Technical Field

[0001] This invention relates to the field of mica paper raw material mixing technology, and more specifically, to a raw material pretreatment mixing apparatus for producing mica paper. Background Technology

[0002] Mica paper, as a type of inorganic non-metallic specialty paper, has the characteristics of high temperature resistance, high pressure resistance, excellent insulation performance and strong chemical stability. It is widely used in electrical insulation, high temperature industry, aerospace and building fire protection. Specifically, before preparing mica paper, mica sheets need to be pretreated, which includes crushing, screening and mixing steps.

[0003] In terms of existing technology, during the mixing process of mica flakes and solvent, the mixing effect is achieved by the shearing and thrusting force generated by the stirring blades in the mixer. First, the solvent is added to the mixing tank and the mixer is started. Then, the mica flakes are added and stirring is continued to disperse the mica flakes in the solvent.

[0004] When the stirring blades rotate, the solvent is thrown towards the tank wall under centrifugal force, forming an upward flow along the wall. This results in the liquid level at the inner wall being higher than in the central area, i.e., the solution forms a vortex. Because mica sheets are easily pushed towards the tank wall under centrifugal force in the vortex and circulate along the inner wall under the action of the wall-climbing flow, it is difficult for the mica sheets to enter the central area to participate in stirring, reducing the uniformity of mixing. Summary of the Invention

[0005] The present invention provides a raw material pretreatment mixing device for producing mica paper, which divides the water-facing surface into two liquid streams flowing out from the top edge through a flow diffuser, thereby solving the problem mentioned in the background art, namely: mica sheets are difficult to enter the central area to participate in stirring, reducing the uniformity of mixing.

[0006] To achieve the above objectives, a raw material pretreatment mixing device for producing mica paper includes a mixing tank, a support, a discharge pipe, a feed pipe, and a stirring device for mixing the solution with mica flakes. A flow-expanding mechanism is slidably arranged on the inner wall of the mixing tank in the longitudinal direction. Several flow-expanding mechanisms are arranged in a circular array in the counterclockwise direction. The flow-expanding mechanism includes a floating mechanism, a flaring block, and a flow-expanding plate. The flow-expanding plate is fixed to the flaring block, and the two sides of the flaring block form a water-facing surface and a water-repellent surface, respectively.

[0007] The floating mechanism is fixed on the flared block and drives the flared block to float on the liquid surface according to the liquid level change at the wall. The flow diffuser is used to divide the top two sides of the flared block into an inner flow channel and an outer flow channel from the inside to the outside.

[0008] When a vortex is formed inside the mixing tank, a stop is provided above the flared block to constrain its upward movement, so that the solution at the wall is higher than the flared block. The inner flow channel is responsible for raising the solution on the water-facing side and guiding it to mix with the solution in the central area. The outer flow channel drives the solution on the water-facing side to jump up and impact the solution on the back side, so as to promote the mixing of the solution with the mica flakes through the impact force of the solution.

[0009] In the above technical solution, the flared block has an upper arc surface and a lower arc surface on the water-facing side, and a sharp point is formed at the end of the upper arc surface and the lower arc surface. This sharp point can separate the water-facing solution, making the water-facing solution split into two streams. One stream is guided along the upper arc surface to the mixing tank on the back water surface to wash away the mica flakes attached to the inner wall of the mixing tank on the back water surface, reducing the adhesion of the mica flakes to the inner wall. The other stream is guided downward by the lower arc surface to penetrate into the interior of the solution, enhancing the disturbance and mixing effect inside the solution.

[0010] Based on the above, the diffusers are symmetrically arranged on the upper arc surface, with the intersection of the two diffusers located at the center of the lower edge of the upper arc surface. The other end of the diffusers extends to the upper edge of the upper arc surface, and the diffusers on both sides are... Figure 3 The top view projection forms a triangular structure;

[0011] That is, when the solution level rises from L1 to L2, the solution level is higher than the tip of the flared block. The solution slides from the water-facing side into the upper arc surface and then flows out from the back side. During this process, the two side diffusers split the solution on the upper arc surface, causing the solution to flow out in two streams.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] 1. In the raw material pretreatment mixing device used for producing mica paper, when the liquid level on the water-facing side exceeds the lower edge of the upper arc surface of the flared block, the solution on the water-facing side is divided into two streams by the flow diffuser and flows out from the upper edge. One stream flows out from the upper edge and then plunges down to the central area of ​​the smooth solution, while the other stream peels off the mica flakes attached to the inner wall of the back water side of the mixing tank and impacts the solution at the back water side wall. This reduces the adhesion of mica flakes to the inner wall of the mixing tank, improves the fluidity of the solution at the wall and the degree of mixing between the mica flakes and the solution.

[0014] 2. In the raw material pretreatment mixing device used for producing mica paper, when the solution on the water-facing side touches the guide plate, the solution near the inner wall of the mixing tank is guided to the central area under its guidance, thereby preventing the solution from forming a stagnant zone near the inner wall of the tank, ensuring uniform solution flow, and thus improving the overall mixing effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2This is a front view of the internal structure of the mixing tank of the present invention (cut section).

[0017] Figure 3 This is a top view of the internal structure of the mixing tank of the present invention (cut section).

[0018] Figure 4 This is a schematic diagram of the longitudinal movement of the flared block according to the present invention;

[0019] Figure 5 This is a top view of the cross-sectional structure of the disturbance plate and the diversion plate of the present invention;

[0020] Figure 6 This is a schematic diagram illustrating the liquid flow principle on the upper and lower arc surfaces of the flared block according to the present invention.

[0021] Figure 7 This is a schematic diagram of the liquid flow direction in the inner and outer flow channels of the present invention;

[0022] Figure 8 This is a top view of the diffuser plate and stop block of the present invention.

[0023] The meanings of the labels in the diagram are as follows:

[0024] 100. Mixing tank; 101. Support frame; 102. Discharge pipe; 103. Feed pipe; 104. Stirring device; 105. Guide rail; 106. Sliding block;

[0025] 110. Stop component; 111. Upright pole; 112. Stop block;

[0026] 120. Flow-expanding mechanism; 121. Flaring block; 122. Flow-expanding plate; 123. Float plate; 124. Inner flow channel; 125. Outer flow channel; 126. Disturbance plate; 127. Drain plate; 128. Liquid guide port;

[0027] 130. Filter plate; 131. Opening. Detailed Implementation

[0028] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0029] To address the problem that mica sheets are difficult to enter the central region for mixing, thus reducing the uniformity of the mixture, this invention discloses a raw material pretreatment mixing device for producing mica paper. (Refer to...) Figure 1 , Figure 2As shown, the system includes a mixing tank 100, a support 101, a discharge pipe 102, a feed pipe 103, and a stirring device 104 for mixing the solution with mica flakes. Before the solvent is added to the mixing tank 100, the discharge pipe 102 is closed. The solvent is added to the mixing tank 100 through the feed pipe 103. Then, the stirring device 104 is activated to stir the solvent. Simultaneously, mica flakes are added to the solvent to mix with it and form a solution. The stirring direction of the stirring device 104 is referenced to... Figure 3 As indicated by the hollow arrow, it rotates counterclockwise;

[0030] Considering the varying particle sizes of the added mica flakes, a filter plate 130 is fixedly installed on the inner wall of the mixing tank 100's top cover. The filter plate 130 is shaped like an inverted funnel. When the mica flakes are added to the filter plate 130 through the feed pipe 103, they slide from the raised end to the lower end of the filter plate 130 under gravity. During this process, smaller-diameter mica flakes pass through the filter plate 130 and fall directly into the solution for mixing. Furthermore, the bottom of the filter plate 130 has an opening 131 for larger-diameter mica flakes to pass through. Therefore, the larger-diameter mica flakes fall from the opening 131 into the central area of ​​the solution for mixing. Under the agitation, the larger-diameter mica flakes falling into the central area move closer to the inner wall of the mixing tank 100. This method increases the mixing path of the larger-diameter mica flakes, allowing them to mix with the solution and improving the distribution and mixing effect of the mica flakes in the solution.

[0031] To facilitate understanding of the above, the longitudinal direction of the inner wall of mixing tank 100 (this longitudinal direction is for reference) Figure 2 The flow amplification mechanism 120 is slidably mounted on the upper part (as indicated by the middle arrow). Figure 2 The image shows the front view of the flow amplification mechanism 120, and in conjunction with... Figure 3 As shown, several flow-expanding mechanisms 120 are arranged in a counterclockwise circular array. The flow-expanding mechanism 120 includes a floating mechanism, a flared block 121, and a flow-expanding plate 122. The flow-expanding plate 122 is fixed to the flared block 121. The two sides of the flared block 121 form a water-facing surface and a water-repelling surface, respectively. The floating mechanism is fixed on the flared block 121 and drives the flared block 121 to float on the liquid surface according to the liquid level change at the wall. The flow-expanding plate 122 is used to divide the top two sides of the flared block 121 from the inside to the outside into an inner flow channel 124 and an outer flow channel 125.

[0032] When a vortex is formed inside the mixing tank 100, a stop 110 is provided above the flared block 121 to constrain its upward movement. When the preset liquid level is reached inside the mixing tank 100, the stop 110 holds the flared block 121 in place. Since a vortex is formed inside the mixing tank 100, the liquid level near the inner wall of the mixing tank 100 is higher than that in the central area. Therefore, the stop 110 restricts the upward movement of the flared block 121 so that the solution at the wall is higher than the flared block 121. At this time, the inner flow channel 124 is responsible for raising the solution on the water-facing side and guiding it to mix with the solution in the central area. The outer flow channel 125 drives the solution on the water-facing side to jump up and impact the solution on the back side, thereby promoting the mixing of the solution with the mica flakes through the impact force of the solution.

[0033] First, it needs to be clarified that: Figure 3 The diagram shows the upstream and downstream sides, and the flow direction of the liquid at the inner channel 124 is shown by arrow F1, while the flow direction of the liquid at the outer channel 125 is shown by arrow F2.

[0034] Next, refer to Figure 4 , Figure 5 As shown, a disturbance plate 126 immersed in the solution is fixed to the bottom of the flared block 121. Slider blocks 106 are fixed on both sides of the contact point between the disturbance plate 126 and the mixing tank 100. A guide rail 105 fixed to the inner wall of the mixing tank 100 is slidably connected to the outside of the slider 106. Due to the fixation of the guide rail 105 to the inner wall of the mixing tank 100, the guide rail 105 restricts the slider 106, allowing the disturbance plate 126 to move only vertically. The vertical movement of the disturbance plate 126 requires a floating mechanism. This floating mechanism includes a float 123 fixed to the back surface of the flared block 121. The float 123 provides buoyancy to the flared block 121, causing it to float on the liquid surface. Before agitation, as the liquid level in the mixing tank 100 increases, the disturbance plate 126 moves upward under the buoyancy of the float 123 until the addition of solution stops. At this point, the liquid level in the mixing tank 100 is referenced to... Figure 2 As shown by the dashed line L1, the liquid level remains stable, and the liquid surface is located at the center of the flared block 121.

[0035] When the liquid level rises to a certain height, the stop 110 abuts against the flared block 121 to limit its upward movement. The specific structure of the stop 110 is shown below. The stop 110 includes a vertical rod 111 through which the filter plate 130 passes and whose top is fixed to the top cover of the mixing tank 100, and a stop block 112 fixed to the bottom of the vertical rod 111. When the solution level in the mixing tank 100 rises to the preset water level L1, the stop block 112 and the flared block 121 abut against each other, limiting the flared block 121 from continuing to rise and maintaining it at a certain level. Figure 2As shown in the diagram, when the solution inside the mixing tank 100 is agitated, the solution in the mixing tank 100 forms a state where the central region is low and the edge region is high. At this time, because the top of the flared block 121 is constrained by the stop block 112, it cannot continue to float upwards. However, the solution level near the inner wall of the mixing tank 100 rises relatively, and the solution level is higher than the center of the flared block 121. That is, the solution level near the inner wall of the mixing tank 100 reaches... Figure 2 The height is indicated by the dashed line L2.

[0036] Return to Figure 3 , Figure 4 , Figure 5 As shown, the flared block 121 has an upper arc surface and a lower arc surface on the water-facing side, and sharp points are formed at the ends of the upper and lower arc surfaces. These sharp points can separate the water-facing solution, causing it to split into two streams. One stream is guided along the upper arc surface to the mixing tank 100 on the back side, thereby scouring the mica flakes attached to the inner wall of the mixing tank 100 on the back side and reducing the adhesion of the mica flakes to the inner wall. The other stream is guided downward by the lower arc surface, penetrating into the interior of the solution (leading it to the depth of the solution), thereby enhancing the disturbance and mixing effect inside the solution.

[0037] When one of the solutions flows deeper into the lower arc, refer to Figure 6 As shown, a liquid guide port 128 is provided on the liquid guide port 128 near the lower edge of the lower arc surface. When the solution comes into contact with the lower arc surface, it is guided to the liquid guide port 128 under the guidance of the lower arc surface. The liquid guide port 128 is used for the solution to flow through the lower arc surface. With the addition of the stirring action, the solution is thrown towards the inner wall of the mixing tank 100 and rises along the inner wall due to the influence of centrifugal force. The solution flowing out of the liquid guide port 128 and the rising solution merge, thereby changing the initial flow direction of the solution flowing out of the liquid guide port 128, turning it upward, and forming an interlaced impact with another stream of solution that jumps up from the upper arc surface, thereby improving the mixing effect of the solution and the mica sheet.

[0038] Furthermore, such as Figure 7 As shown, the diffuser plates 122 are symmetrically arranged on the upper arc surface. The intersection of the two diffuser plates 122 is located at the center of the lower edge of the upper arc surface. The other end of the diffuser plate 122 extends to the upper edge of the upper arc surface, and the two diffuser plates 122 are located at... Figure 3 The top view projection forms a triangular structure, that is, when the solution level rises from L1 to L2, the solution level is higher than the tip of the flared block 121. The solution slides from the water-facing side into the upper arc surface and then flows out from the back water surface. During this process, the two side expansion plates 122 divide the solution on the upper arc surface, so that the solution flows out in two streams.

[0039] Furthermore, the outer flow channel 125 faces the inner wall of the backwater mixing tank 100, while the inner flow channel 124 faces away from the inner wall of the mixing tank 100. The flow direction at the inner flow channel 124 is symmetrical to that at the outer flow channel 125. With the agitation of the solution, a portion of the solution on the water-facing side is guided deep into the lower arc surface, while another portion is divided into two streams by the diffuser plate 122. One stream flows through the outer flow channel 125 towards the inner wall of the backwater mixing tank 100, while the other stream flows through the inner flow channel 124 towards the central region. Specifically:

[0040] The solution at the water-facing surface is divided into three paths: Path 1, the solution flows deeper along the lower arc of the flared block 121; Path 2, the portion of the solution beyond the tip of the flared block 121 flows out from the inner flow channel 124; Path 3, the portion of the solution beyond the tip of the flared block 121 flows out from the outer flow channel 125. Path 1 has been described in detail above and will not be further explained here. Regarding Path 2, the solution at the water-facing surface flows in from the lower edge of the inner flow channel 124, and flows out from the upper edge under the guidance of the upper arc and the diffuser plate 122. During this process, the liquid flow height is raised, and when it reaches the highest point, it moves downward under the action of gravity. The liquid flow forms a diving impact with the relatively gentle solution in the central area, thereby destroying the stability of the solution in the central area and causing it to shear with the solution, which significantly improves the mixing efficiency.

[0041] Regarding path three, the liquid flows from the lower edge to the upper edge of the outer channel 125. Since the outer channel 125 faces the inner wall of the backwater mixing tank 100, when the liquid flows out from the upper edge, the liquid flows towards the inner wall of the backwater mixing tank 100, scouring the mica flakes attached to the inner wall of the backwater mixing tank 100. At the same time, the liquid impacts the solution located on the backwater side close to the inner wall of the mixing tank 100, causing the mica flakes in the solution to mix with the solution, further improving the mixing effect of the mica flakes.

[0042] In other words, when the liquid level on the water-facing side exceeds the lower edge of the upper arc surface of the flared block 121, the solution on the water-facing side is split into two streams by the flow diffuser 122 and flows out from the upper edge. One stream flows out from the upper edge and then plunges down to the central area to smooth the solution, while the other stream peels off the mica flakes attached to the inner wall of the back water side of the mixing tank 100 and impacts the solution at the back water side wall. This reduces the adhesion of mica flakes to the inner wall of the mixing tank 100, improves the fluidity of the solution at the wall and the degree of mixing between the mica flakes and the solution.

[0043] It should also be understood that, in order to reduce the obstruction of the liquid flow on both sides by 112, this is done in conjunction with... Figure 8 As shown, the length of 112 is L4, and the distance between the two sides 122 is L3. L4 is less than L3, so 112 will not obstruct the flow of liquid on both sides, thus ensuring the impact force of the liquid flow.

[0044] Returning to Figure 5As shown, an inclined guide plate 127 is fixedly installed on the water-facing side of the disturbance plate 126, forming a triangle with the disturbance plate 126. One end of the guide plate 127 is attached to the inner wall of the mixing tank 100, and the other end faces the central area of ​​the solution, guiding the solution to flow towards the central area. In this way, when the solution on the water-facing side comes into contact with the guide plate 127, the solution near the inner wall of the mixing tank 100 is guided towards the central area under the action of the guide plate 127. This can effectively prevent the solution from forming a stagnant zone near the inner wall of the mixing tank 100, making the solution flow more uniform and improving the mixing effect.

[0045] Finally, after the solutions are mixed, the mixed solution is discharged through the discharge pipe 102, and then the inner wall of the mixing tank 100 is cleaned.

[0046] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A raw material pretreatment mixing device for producing mica paper, comprising a mixing tank (100), a support (101), a discharge pipe (102), a feed pipe (103), and a stirring device (104) for mixing the solution with mica flakes, characterized in that: A flow-expanding mechanism (120) is slidably arranged on the inner wall of the mixing tank (100) in the longitudinal direction. Several flow-expanding mechanisms (120) are arranged in a circular array in the counterclockwise direction. The flow-expanding mechanism (120) includes a floating mechanism, a flared block (121) and a flow-expanding plate (122). The flow-expanding plate (122) is fixed to the flared block (121). The two sides of the flared block (121) form a water-facing surface and a water-repellent surface, respectively. The floating mechanism is fixed on the flared block (121) and drives the flared block (121) to float on the liquid surface according to the liquid level change at the wall. The flow-expanding plate (122) is used to divide the top two sides of the flared block (121) into an inner flow channel (124) and an outer flow channel (125) from the inside to the outside. When a vortex is formed inside the mixing tank (100), a stop (110) is provided above the flared block (121) to constrain its upward movement, so that the solution at the wall is higher than the flared block (121). The inner flow channel (124) is responsible for raising the solution on the water-facing side and guiding it to mix with the solution in the central area. The outer flow channel (125) drives the solution on the water-facing side to jump up and impact the solution on the back side, so as to promote the mixing of the solution with the mica flakes through the impact force of the solution. The flared block (121) has an upper arc surface and a lower arc surface on the water-facing side, and a sharp point is formed at the end of the upper arc surface and the lower arc surface. This sharp point can separate the water-facing solution, so that the water-facing solution is divided into two streams. One stream is guided along the upper arc surface to the back water mixing tank (100) to scour the mica flakes attached to the inner wall of the back water mixing tank (100). The other stream is guided downward by the lower arc surface and sent to the depth of the solution. A liquid guide port (128) is provided near the lower edge of the lower arc surface, and the liquid guide port (128) is used to allow the solution to flow through the lower arc surface; The diffuser (122) is symmetrically arranged on the upper arc surface. The intersection of the two diffusers (122) is located at the center of the lower edge of the upper arc surface, and the other end extends to the upper edge of the upper arc surface. The two diffusers (122) form a triangular structure when viewed from above, so as to divert the solution on the water-facing surface.

2. The raw material pretreatment mixing device for producing mica paper according to claim 1, characterized in that: A filter plate (130) is fixedly installed on the inner wall of the top cover of the mixing tank (100). The filter plate (130) is in the shape of an inverted funnel, and the bottom of the filter plate (130) has an opening (131) for large-diameter mica flakes to pass through.

3. The raw material pretreatment mixing device for producing mica paper according to claim 1, characterized in that: A disturbance plate (126) is fixed at the bottom of the flared block (121). Slider (106) is fixed on both sides of the contact point between the disturbance plate (126) and the mixing tank (100). The slider (106) is externally connected to a guide rail (105), and the guide rail (105) is fixed to the mixing tank (100).

4. The raw material pretreatment mixing apparatus for producing mica paper according to claim 1, characterized in that: The floating mechanism includes a float plate (123) fixed to the back surface of the flared block (121), the float plate (123) providing buoyancy to the flared block (121) so that the flared block (121) floats on the liquid surface.

5. The raw material pretreatment mixing apparatus for producing mica paper according to claim 4, characterized in that: The stop (110) includes a vertical rod (111) through which the filter plate (130) passes and whose top is fixed to the top cover of the mixing tank (100), and a stop block (112) fixed to the bottom of the vertical rod (111). When the liquid level in the mixing tank (100) rises to the preset water level, the stop block (112) and the flared block (121) abut against each other to limit the flared block (121) from continuing to float.

6. The raw material pretreatment mixing apparatus for producing mica paper according to claim 1, characterized in that: The outer flow channel (125) faces the inner wall of the back water mixing tank (100), and the inner flow channel (124) faces away from the inner wall of the mixing tank (100). The direction of liquid flow at the inner flow channel (124) is symmetrical to the direction of liquid flow at the outer flow channel (125).

7. The raw material pretreatment mixing apparatus for producing mica paper according to claim 3, characterized in that: An inclined guide plate (127) is fixedly installed on the water-facing side of the disturbance plate (126) and forms a triangle with the disturbance plate (126); one end of the guide plate (127) is attached to the inner wall of the mixing tank (100), and the other end is directed toward the central area of ​​the solution to guide the solution toward the central area.

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