A screw for making filter element carbon rods

Abstract

The present invention discloses a screw rod for manufacturing a filter element carbon rod, which comprises a screw rod body. The screw rod body is provided with two sections of thread ridges along the discharging direction. The first section of thread ridge is close to the discharging end of the screw rod body. The distance from the outer end of the first section of thread ridge to the central axis of the screw rod body gradually decreases along the discharging direction. This screw rod breaks the original material conveying ratio and the extrusion force of the material to achieve the manufacture of carbon rods with different accuracies of the inner and outer layers.

Description

Technical Field

[0001] The present invention relates to a screw for manufacturing a filter element carbon rod. Background Art

[0002] At present, the density of each part of the carbon rods on the market is the same, and the accuracy of the inner and outer layers of the carbon rods is the same. For the application of carbon rods, when pursuing the flow life of the carbon rods, the accuracy of the carbon rods is reduced to meet the requirements, but the overall physical interception ability of the carbon rods is sacrificed. When there is a need for physical interception of the carbon rods, the flow rate needs to be sacrificed, and the interception ability of the carbon rods is improved by increasing the filtration accuracy. Flow rate and accuracy are, to a certain extent, conflicting indicators, with one increasing while the other decreasing. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a screw for manufacturing a filter element carbon rod.

[0004] The present invention is realized through the following technical solutions:

[0005] A screw for manufacturing a filter element carbon rod includes a screw body. The screw body is provided with two sections of thread ridges along the discharging direction. The first section of thread ridge is close to the discharging end of the screw body, and the distance from the outer end of the first section of thread ridge to the central axis of the screw body gradually decreases along the discharging direction.

[0006] In an embodiment of the present invention, the distance between the first section of thread ridges gradually increases in the discharging direction.

[0007] In an embodiment of the present invention, the second section of thread ridge is close to the feeding end of the screw body. The heights of the second section of thread ridges are equal, and the distances between the second section of thread ridges are equal.

[0008] In an embodiment of the present invention, the decreasing amplitude of the distance from the outer end of the first section of thread ridge to the central axis of the screw body is 30% - 70% of the thickness of the carbon rod.

[0009] In an embodiment of the present invention, the distance between the threads of the first section of thread ridge gradually increases by 0% - 30% compared with the distance between the second section of thread ridges.

[0010] A screw for manufacturing a filter element carbon rod of the present invention has the following beneficial effects: By changing the characteristics of the screw in the present invention, the carbon rod manufactured by it can improve the flow rate and the ability of dirt collection and anti-blocking. Brief Description of the Drawings

[0011] In order to more clearly illustrate the technical solutions of the present invention, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0012] Figure 1 This is a perspective view of the present invention.

[0013] Figure 2 This is a cross-sectional view of the present invention.

[0014] Figure 3 It is Figure 2 an enlarged schematic view of the position A in

[0015] Figure 4 a schematic view of manufacturing a carbon rod according to the present invention. Specific Embodiments

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0017] Referring to the accompanying drawings of the specification, a screw for manufacturing a filter element carbon rod includes a screw body 10. The screw body is provided with two sections of thread ridges along the discharging direction. The first section of thread ridge 20 is close to the discharging end of the screw body, and the distance H from the outer end of the first section of thread ridge to the central axis of the screw body gradually decreases along the discharging direction. Further, the distance L between the first section of thread ridges gradually increases in the discharging direction.

[0018] In an embodiment of the present invention, the second section of thread ridge 30 is close to the feeding end of the screw body. The heights of the second section of thread ridges are equal, and the distances between the second section of thread ridges are equal.

[0019] In the specific use of the present invention, the decreasing amplitude of the distance H from the outer end of the first section of thread ridge to the central axis of the screw body is 30% - 70% of the carbon rod thickness D. Referring to the accompanying drawings of the specification, the decreasing amplitude can be 30%, 40%, 50%, 58%, 65%, 70% of the carbon rod thickness D. At the same time, the distance between the first section of thread ridges gradually increases by 0% - 30% compared with the distance between the second section of thread ridges. The increase can be 1%, 5%, 14%, 16%, 24%, 28%, 30% of the distance between the second section of thread ridges. Assuming that the increasing amplitude of the distance between the first section of thread ridges compared with the distance between the second section of thread ridges is F, and the distance between the second section of thread ridges is S, then the pitches of the first section of thread ridges are (1 + F)S, (1 + F)(1 + F)S, (1 + F)(1 + F)(1 + F)S... and so on.

[0020] More specifically, the present invention breaks the original material conveying ratio and the extrusion force of the material by changing the height, pitch, etc. of the screw ridges connected to the screw body, so as to realize the production of carbon rods with different accuracies for the inner and outer layers. In one embodiment, the height of 1 to 4 turns of screw ridges (the first section of screw ridges mentioned above) connected to the screw body is reduced, and the reduction range is 30% to 70% of the thickness of the carbon rod, so as to change the forward extrusion force of the front end of the screw ridges of the screw on the material in different longitudinal planes; the screw pitch of the first section of screw ridges with reduced height is changed by 0% to 30%, so as to change the conveying ratio of the material at the front end of the screw ridges, break the original shape of the material, and make the material re-stack, so as to achieve the purpose of changing the accuracy of the carbon rod. The screw in the present invention is applicable to the extrusion of carbon rods, and the carbon rods can be applicable to filtration. The raw materials of the carbon rods can be activated carbons such as coconut shell activated carbon, fruit pit activated carbon, coal-based activated carbon, etc. and binders such as PE and PVDF.

[0021] The carbon rods made by this screw will be described below. Refer to the specification Figure 4 It is a cross-section of a carbon rod with a loose outer and a tight inner. An embodiment of the screw will be described below: The distance from the outer end of the first section of screw ridges connected to the screw body in the screw to the central axis of the screw body is reduced by 2 to 4 mm, and the screw pitch is increased by 3 to 5 mm. After the improvement, a carbon rod extrusion test is carried out. The raw material of the experiment is coconut shell activated carbon with a mesh size of 80*200, and the rubber powder is LDPE. And under the condition of 30 psi, tap water is passed to test its flow rate and flow rate life, so as to evaluate whether the improved screw can improve the accuracy and dirt holding performance of the carbon rod. Among them, the blank control is a carbon rod of the same size made by a conventional screw under the conditions of the same formula and the same molding process (the size of this carbon rod can be 43.5 mm * 19 mm * 263 mm).

[0022] The following table shows the test data:

[0023] 1. Flow rate test

[0024]

[0025] As can be seen from the above table, under the same conditions of formula, molding process and test environment, the initial flow rate of the carbon rod made by the improved screw can reach 5.11 L / min, and after passing 10 t of tap water, its flow rate is still 4.72 L / min, and the flow rate attenuation is 7.55%; while the flow rate of the carbon rod made before the screw improvement is 4.92 L / min, and the initial flow rate is not much different from that of the improved carbon rod. However, after passing 10 t of water, the flow rate of the carbon rod made before the screw improvement decays to 3.76 L / min. Compared with its initial flow rate, it drops by 28.76%. Compared with the flow rate of the carbon rod made after the screw improvement, the flow rate attenuation amount is 0.961 L / min more, and the attenuation rate is 21.21% higher.

[0026] 2. Next, the accuracy of its carbon rod will be tested

[0027]

[0028] As can be seen from the above table, the precision of the carbon rods made with the improved screw is similar to that of the carbon rods made with the conventional screw.

[0029] Based on the above two data, it can be seen that without changing the precision of the carbon rods, by improving the screw, the flow rate of the carbon rods and their ability to prevent dirt and blockage can be effectively improved.

[0030] The above description shows and describes the preferred embodiments of the present invention. As mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be changed within the scope of the inventive concept described herein through the above teachings or the techniques or knowledge in the relevant field. And any changes and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall fall within the protection scope of the appended claims of the present invention.

Claims

1. A screw for making filter element carbon rods, comprising a screw body, characterized in that, The screw body is provided with two sections of screw threads along the discharging direction, wherein the first section of screw thread is close to the discharging end of the screw body, and the distance from the outer end of the first section of screw thread to the central axis of the screw body gradually decreases along the discharging direction; The decreasing amplitude of the distance from the outer end of the first section of screw thread to the central axis of the screw body is 30% - 70% of the thickness of the carbon rod; The distance between the threads of the first section of screw thread gradually increases by 0% - 30% compared with the distance between the threads of the second section of screw thread; Assume that the increment of the distance between the threads of the first flight of screw ribs compared to the distance between the threads of the second flight of screw ribs is F, and the distance between the threads of the second flight of screw ribs is S. Then the pitches of the first flight of screw ribs are successively (1 + F)S, (1 + F)(1 + F)S, (1 + F)(1 + F)(1 + F)S, …, (1 + F) n S.

2. The screw for manufacturing the filter element carbon rod according to claim 1, characterized in that, The distance between the above-mentioned first section of screw threads gradually increases towards the discharging direction.

3. A screw for manufacturing a filter element carbon rod according to claim 2, characterized in that, Wherein the second section of screw thread is close to the feeding end of the screw body, the heights of the second section of screw threads are equal, and the distances between the second section of screw threads are equal.

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