Combined powder conveying screw

Abstract

The utility model discloses a combined type powder conveying screw which comprises a screw blade, the screw blade is formed by combining a plurality of blade sections in the axial direction, the blade sections are ceramic components, each screw pitch length L on the screw blade comprises at least two blade sections, each blade section comprises a connecting sleeve part and a blade part, and the connecting sleeve parts and the blade parts are arranged on the connecting sleeve parts. The blade section is sleeved on the spiral mandrel through the connecting sleeve part and is fixedly connected with the spiral mandrel through the connecting screw; and the connecting screw is sunk in the connecting screw hole in the connecting sleeve part. And a PTFE (Polytetrafluoroethylene) sealing plug is arranged at the orifice of the connecting screw hole. The combined type powder conveying spiral can ensure reliable isolation between conveyed materials and conveying spiral metal base materials, and is long in service life.

Description

Technical Field

[0001] The utility model relates to a conveying device, in particular to an improvement of a conveying screw in a screw-type conveying device. Background Art

[0002] The conveyor screw is a key component of screw conveying equipment. The rotation of the conveyor screw causes the material inside the conveyor housing to move toward the discharge end under the push of the spiral blades, thus achieving material conveying. Conventional conveyor screws are constructed of steel spiral blades welded to a spiral core. The steel spiral blades have excellent wear resistance and can meet the service life requirements of the conveyed material under constant friction with the spiral blades. However, for certain materials, the conveyor screw must not come into contact with metal materials during the conveying process to prevent metal ions in the metal materials from contaminating the material and affecting the purity and performance of the material. A common solution is to coat the conveyor blades with plastic or other non-metallic coatings. However, the service life of such coatings is difficult to guarantee. The friction between the conveyor screw and the conveyed material is particularly severe, which is most likely to cause the coating to wear or peel. Furthermore, the conveyor screw is located within a sealed conveyor housing, making it difficult to detect whether the coating is worn or peeling. Once the coating wears or peels, the metal substrate is exposed, which can cause serious quality problems. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a combined powder conveying screw, which can ensure reliable isolation between the conveyed material and the metal substrate of the conveying screw and has a long service life.

[0004] In order to solve the above technical problems, the utility model provides a combined powder conveying spiral, including a spiral blade, which is composed of several blade segments combined along the axial direction. Each pitch length L on the spiral blade includes at least two blade segments. The blade segment includes a connecting sleeve and a blade portion, and the blade segment is fixedly connected to the spiral core shaft through the connecting sleeve.

[0005] After adopting the above technical scheme, the entire spiral blade composed of several blade segments combined along the axial direction will be made of non-metallic materials with high wear resistance. Each blade segment is made of the same material as a whole, avoiding the problems of coating wear and peeling when non-metallic coatings are applied on metal spiral blades, and is reliable to use and has a long service life; the spiral blades made in segments will make it possible to use non-metallic materials with high wear resistance. Each pitch length L on the spiral blade includes at least two blade segments, so that the blade segments can be more conveniently formed during the manufacturing process and can facilitate the maintenance of consistent shapes. The blade segments are fixedly connected to the spiral core shaft through the connecting sleeve. The spiral core shaft made of metal can be used to ensure the rigidity of the conveying spiral, and the conveyed material can be completely isolated from the metal spiral core shaft, thereby ensuring the performance of the conveying spiral.

[0006] In a preferred embodiment of the present invention, the spiral blade includes three to six blade segments within each pitch length L. In this embodiment, the angle of the spiral portion in each blade segment is 120 degrees to 60 degrees, which can facilitate the manufacturing and molding of the blade segments.

[0007] In another preferred embodiment of the present invention, the blade segments have equal axial lengths. With this embodiment, the blade segments do not need to be arranged in sequence when assembled, and can be arranged arbitrarily, making manufacturing and assembly easier.

[0008] In another preferred embodiment of the present invention, the blade segments are securely connected to the spiral mandrel via connecting sleeves using connecting screws, which are sunk into connecting screw holes in the sleeves. Plugs are provided at the openings of the connecting screw holes. This embodiment ensures a secure and reliable connection between the blade segments and the spiral mandrel, and the connecting screws are isolated from the conveyed material by the plugs, ensuring worry-free operation.

[0009] In a further preferred embodiment of the present invention, the sealing plug is press-fitted into the opening of the connecting screw hole, with its outer surface resting on the outer surface of the connecting sleeve. This embodiment ensures a secure connection between the sealing plug and the connecting screw hole, prevents the sealing plug from protruding from the connecting sleeve, and prevents the sealing plug from loosening due to contact and friction between the conveyed material and the sealing plug.

[0010] In another preferred embodiment of the present invention, the plug is made of PTFE. In this embodiment, the PTFE material is acid and alkali resistant, has a low friction coefficient, and can meet the requirements of use.

[0011] In another preferred embodiment of the present invention, the connecting sleeve portion on the blade segment is divided into two parts along the circumferential direction, and the blade portion is located on one part of the connecting sleeve portion. This embodiment can further facilitate the molding of the blade segment.

[0012] In a further preferred embodiment of the present invention, the two parts of the connecting sleeve are respectively provided with connecting screw holes. With this embodiment, the two-part blade segment can be fixedly connected to the spiral mandrel by connecting screws, resulting in a simple structure.

[0013] In another further preferred embodiment of the present invention, the blade segment is a ceramic component. In this embodiment, the blade segment of the ceramic component has good wear resistance and rigidity, can be manufactured through mature production technology, and has excellent performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The combined powder conveying screw of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a structural diagram of a specific embodiment of the combined powder conveying screw of the utility model;

[0016] Figure 2 yes Figure 1 A cross-sectional view of the structure shown at position AA;

[0017] Figure 3 yes Figure 1 Schematic diagram of the structure of the leaf segment in the structure shown;

[0018] Figure 4 yes Figure 3 The structure shown is a schematic diagram of the structure in which the connecting sleeve part is split into two parts and then connected to a part of the blade part.

[0019] In the figure: 1-spiral core shaft, 2-spiral blade, 21-blade segment, 211-blade portion, 212-connecting sleeve portion, 213-connecting screw hole, 3-sealing plug, 4-connecting screw. DETAILED DESCRIPTION

[0020] exist Figure 1 and Figure 2 In the combined powder conveying spiral shown, the spiral core shaft 1 is a steel shaft-like component, and the spiral blade 2 is arranged on the spiral core shaft 1. The spiral blade 2 is composed of a plurality of blade segments 21 assembled along the axial direction. The blade segments 21 are preferably precision ceramic components. Each pitch length L on the spiral blade 2 includes at least two blade segments 21. As an example, each pitch length L on the spiral blade 2 includes three to six blade segments 21. The axial lengths of the blade segments 21 are equal. As shown in the figure, each pitch length L on the spiral blade 2 includes four blade segments 21. Figure 3The blade segment 21 includes a connecting sleeve 212 and a blade portion 211. The blade segment 21 is fixedly connected to the spiral core shaft 1 through the connecting sleeve 212. A connecting screw hole 213 is provided on the connecting sleeve 212. The blade segment 21 is fixedly connected to the spiral core shaft 1 through the connecting screw hole 213 on the connecting sleeve 212 with a connecting screw 4. The connecting screw 4 is sunk into the connecting screw hole 213 on the connecting sleeve 212. A sealing plug 3 is provided at the opening of the connecting screw hole 213. The sealing plug 3 is press-fitted into the opening of the connecting screw hole 213. Its outer surface is on the outer surface of the connecting sleeve 212. The sealing plug 3 is made of PTFE. As a preferred embodiment, the connecting sleeve 212 on the blade segment 21 is divided into two parts along the circumferential direction. See Figure 4 The blade portion 211 is located on one part of the connecting sleeve portion 212, and connecting screw holes 213 are respectively provided on the two parts of the connecting sleeve portion 212 for being fixedly connected to the spiral core shaft 1 respectively.

[0021] The above only lists some preferred embodiments of the present invention, but the present invention is not limited thereto and many improvements and modifications can be made. As long as the improvements and modifications are made based on the basic principles of the present invention, they should be considered to fall within the scope of protection of the present invention.

Claims

1. A combined powder conveying screw, comprising a spiral blade (2), characterized in that: The spiral blade (2) is composed of a plurality of blade segments (21) combined along the axial direction. Each pitch length L on the spiral blade (2) includes at least two blade segments (21). The blade segment (21) includes a connecting sleeve (212) and a blade segment (211). The blade segment (21) is fixedly connected to the spiral core shaft (1) through the connecting sleeve (212). Each pitch length L on the spiral blade (2) includes three to six blade segments (21). The connecting sleeve (212) on the blade segment (21) is divided into two parts along the circumferential direction. The blade segment (211) is located on one part of the connecting sleeve (212). The two parts of the connecting sleeve (212) are respectively provided with connecting screw holes (213). The blade segment (21) is a ceramic component.

2. The combined powder conveying screw according to claim 1, characterized in that: The blade segments (21) have the same axial length.

3. The combined powder conveying screw according to claim 1, characterized in that: The blade segment (21) is fixedly connected to the spiral core shaft (1) by means of a connecting screw (4) through a connecting sleeve (212); the connecting screw (4) is sunk into a connecting screw hole (213) on the connecting sleeve (212); and a sealing plug (3) is provided at the opening of the connecting screw hole (213).

4. The combined powder conveying screw according to claim 3, characterized in that: The sealing plug (3) is pressed into the opening of the connecting screw hole (213), and its outer surface is located on the outer surface of the connecting sleeve (212).

5. The combined powder conveying screw according to claim 4, characterized in that: The plug (3) is made of PTFE.

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