Flexible conveying and shape keeping device for formed straw and soil composite pipe

Abstract

A flexible conveying and shape keeping device for a straw and soil composite pipe after forming comprises a conical extrusion device, the end of a forming shaft of an auger of the conical extrusion device is fixedly connected with a spiral spring, the outer end of the spiral spring extends into a conveying pipe of the conical extrusion device, and the outer diameter of the spiral spring is matched with the inner diameter of the composite pipe; the spiral spring connected to the forming shaft of the auger is supported on the inner side face of the composite pipe, the spiral spring rotates along with the auger in the process that the composite pipe is extruded and conveyed, the spiral spring can make contact with the inner side face of the composite pipe from the interior and spirally push the composite pipe, the auxiliary conveying effect is achieved, and the composite pipe is extruded out of the discharging pipe timely and smoothly; and the flexible supporting effect of the spiral spring is beneficial to improving the flexibility of the composite pipe, the overall shape of the formed pipe conveyed outwards is kept, and the machining and forming quality of the pipe is improved.

Description

Technical Field

[0001] The invention relates to the field of material conveying and forming, and in particular to a flexible conveying and shape-keeping device for a straw and soil composite pipe after forming. Background Art

[0002] The invention patent with the authorization announcement number CN114041405B discloses a soil, straw, liquid cyclone mixing and conical extrusion straw soil composite pipe device. A cyclone mixing chamber is arranged above the conical extrusion chamber of the device. Soil and crushed straw enter the cyclone mixing chamber tangentially from the feed pipe. A spray head is arranged at the upper end of the cyclone mixing chamber and connected to the liquid tank through a pipe. The spray head sprays the liquid in the liquid tank into the cyclone mixing chamber to mix with the soil and straw, and spirals downward along the inner wall of the cyclone mixing chamber to fully mix and form a mixed material with a certain humidity, and then enters the conical extrusion chamber. The spiral auger in the conical extrusion chamber continuously compresses the mixed material and squeezes it into the forming round tube to form a cylindrical composite pipe body. In this process, the pipe forming rod at the outer end of the spiral auger leaves a circular channel in the middle of the cylindrical composite pipe body to form it into a circular composite pipe, and sends it out through the S-shaped pipe delivery pipe.

[0003] The problem existing in the use of this device is that when the auger rotates to extrude the mixed material, the mixed material will rotate with the rotation of the auger. Therefore, when the material is extruded to form a composite pipe and reaches the discharge port, the composite pipe still keeps rotating at the discharge port and enters the conveying pipe below, which can easily cause the composite pipe to break; and the soil and straw mixture enters the discharge pipe from the conical extrusion bin, which will generate a large extrusion force, which can easily cause material accumulation and lead to poor discharge. The composite pipe will also be deformed due to pressure, affecting the extrusion molding efficiency and molding quality of the pipe, which needs to be improved. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes a device for flexible transportation and shape retention of a straw and soil composite pipe after forming.

[0005] The technical solution of the present invention is: a flexible conveying and shape-maintaining device for forming a straw and soil composite pipe, comprising a conical extrusion device, the forming shaft end of the auger of the conical extrusion device is fixedly connected with a coil spring, and the outer end of the coil spring extends into the conveying pipe of the conical extrusion device.

[0006] Preferably, the outer diameter of the coil spring matches the inner diameter of the composite pipe, and the steel wire of the coil spring can be partially embedded in the inner side of the composite pipe.

[0007] Preferably, the inner end of the coil spring is provided with an axis head, which is a stepped shaft, and its small-sized shaft body is a threaded shaft. The end of the coil spring is fixedly sleeved on one end of the axis head, and the coil spring is welded or fixedly connected to the axis head by a sleeve. The end of the molded shaft is provided with a threaded blind hole, and the other end of the axis head is threadedly connected to the threaded blind hole.

[0008] Preferably, the threaded connection direction between the shaft head and the threaded blind hole is opposite to the rotation direction of the auger.

[0009] Preferably, the fixed end of the coil spring extends into the discharge pipe of the conical extruder for a certain distance.

[0010] Preferably, the pitch of the coil spring and the diameter of the steel wire are set accordingly according to the moisture of the soil.

[0011] The beneficial technical effects of the present invention are: (1) The coil spring connected to the forming shaft of the auger of the present invention is supported on the inner side of the composite pipe. During the extrusion and transportation of the composite pipe, the coil spring rotates with the auger, and can contact the inner side of the composite pipe from the inside and spirally push the composite pipe, thereby playing a role in auxiliary transportation, so that the composite pipe can be extruded from the discharge pipe in a timely and smooth manner; and the flexible supporting effect of the coil spring is conducive to improving the flexibility of the composite pipe, and is conducive to maintaining the overall shape of the pipe after being formed and transported outward, thereby improving the processing and molding quality of the pipe.

[0012] (2) The coil spring at the end of the discharge pipe of the present invention can resist the rotational torque and extrusion force during the extrusion of the composite pipe, prevent the composite pipe from deforming at the discharge port, help maintain the shape and dimensional stability of the discharge port, and reduce material accumulation and blockage caused by deformation of the discharge port. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of an existing conical extrusion device; Figure 2 It is a three-dimensional structural schematic diagram of the present invention; Figure 3 It is a schematic diagram of the main structure of the present invention; Figure 4 It is a structural schematic diagram of the composite pipe of the present invention in a state of being extruded from a discharge pipe; Figure 5 It is a schematic diagram of the three-dimensional structure of a coil spring; Figure 6 and Figure 7 It is a physical picture of a prototype of the present invention.

[0014] In the figure, 11. conical extrusion device, 12. auger, 13. forming shaft, 14. threaded blind hole, 15. discharge pipe, 21. coil spring, 22. shaft head, 31. composite pipe. DETAILED DESCRIPTION

[0015] Embodiment 1, see attached Figure 2-3 A device for flexible conveying and shape retention of straw and soil composite pipes after forming, comprising a conical extrusion device, a spiral spring is fixedly connected to the end of the forming shaft of the auger of the conical extrusion device, the outer end of the spiral spring extends into the conveying pipe of the conical extrusion device, the outer diameter of the spiral spring matches the inner diameter of the composite pipe, ensuring that the spiral spring can be elastically pressed against the inner side of the composite pipe.

[0016] The fixed end of the coil spring extends into the discharge pipe of the conical extruder for a certain distance. The end of the coil spring at the discharge pipe can resist the rotational torque and extrusion force during the extrusion of the composite pipe, prevent the composite pipe from deforming at the discharge port, help maintain the shape and dimensional stability of the discharge port, and reduce material accumulation and blockage caused by deformation of the discharge port.

[0017] The pitch of the helical spring and the diameter of the wire are set accordingly to the moisture content of the soil.

[0018] The working process and principle of the flexible conveying and shape maintaining device of this embodiment are as follows: the auger rotates in the conical extrusion device to extrude the mixed material from the discharge pipe. While the mixed material forms a composite pipe in the discharge pipe, the coil spring connected to the forming shaft supports the inner side of the composite pipe. During the extrusion and conveying of the composite pipe, the coil spring rotates with the auger, contacts the inner side of the composite pipe from the inside and spirally pushes the composite pipe, thereby assisting the conveying of the composite pipe, so that the composite pipe can be extruded from the discharge pipe in a timely and smooth manner. At the same time, the flexible supporting force generated by the coil spring can improve the flexibility of the composite pipe, which is beneficial to maintaining the overall shape of the pipe after being formed and conveyed outward, thereby improving the processing and forming quality of the pipe.

[0019] Embodiment 2, see attached Figure 4-5 This embodiment is basically the same as the first embodiment, and the similarities are not repeated here. The difference is that an axle head is provided at the inner end of the coil spring, and the end of the coil spring is sleeved on one end of the axle head by welding and fixing, and a threaded blind hole is provided at the end of the formed shaft, and the other end of the axle head is threadedly connected to the threaded blind hole. The axle head docking structure facilitates the convenient and quick maintenance and replacement of the coil spring at the work site, thereby ensuring work efficiency.

[0020] The threaded connection direction of the shaft head and the threaded blind hole is opposite to the rotation direction of the auger. During the process of the auger spirally extruding the mixed material to form a composite pipe, a reverse tightening force on the shaft head can be generated to ensure that the spiral spring is in a firmly connected state.

Claims

1. A device for flexible conveying and shape-maintaining of a straw and soil composite pipe after forming, comprising a conical extrusion device, characterized in that: The end of the forming shaft of the auger of the conical extrusion device is fixedly connected with a coil spring, and the outer end of the coil spring extends into the conveying pipe of the conical extrusion device.

2. The device for flexible conveying and shape-maintaining of a straw and soil composite pipe after forming according to claim 1, characterized in that: The outer diameter of the coil spring matches the inner diameter of the composite pipe.

3. The device for flexible transportation and shape retention of straw and soil composite pipe after forming according to claim 1 is characterized by: The inner end of the coil spring is provided with an axle head, the end of the coil spring is fixedly sleeved on one end of the axle head, the end of the forming shaft is provided with a threaded blind hole, and the other end of the axle head is threadedly connected to the threaded blind hole.

4. The device for flexible conveying and shape-maintaining of a straw and soil composite pipe after forming according to claim 3 is characterized by: The threaded connection direction between the shaft head and the threaded blind hole is opposite to the rotation direction of the auger.

5. The device for flexible conveying and shape-maintaining of a straw and soil composite pipe after forming according to claim 1, characterized in that: The fixed end of the coil spring extends into the discharge pipe of the conical extruder for a certain distance.

6. The device for flexible transportation and shape retention of straw and soil composite pipe after forming according to claim 1, characterized in that: The pitch of the coil spring and the diameter of the steel wire are set accordingly according to the moisture of the soil.

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