Drying and airing rack for hot-expanded seamless steel pipe

Abstract

The utility model discloses a hot expanding seamless steel pipe drying rack which comprises a long lifting structure and a short lifting structure, a driven steel pipe rotating carrier roller set is connected to the long lifting structure, a driving steel pipe rotating carrier roller set is connected to the short lifting structure, the hot expanding seamless steel pipe drying rack is further provided with a plurality of sets of horizontal racks, and the tail end of a steel pipe is provided with a lubricant recycling groove. The lubricant recovery tank is connected with the collection pool, an air blowing pipe is arranged above the lubricant recovery tank and blows air into the steel pipe, and a hot air suction hood arranged above the heating coil collects hot air and feeds the hot air into the air blowing pipe. The thermal expansion device is reasonable and ingenious in structural design, heat energy generated by the heating coil during thermal expansion is recycled and then fed into a steel pipe coated with a graphite lubricant, drying of the inner wall of the steel pipe is accelerated, and the long lifting structure, the short lifting structure and the horizontal rack provide support for postures of the steel pipe in different stages; and the lubricant recovery tank collects the graphite lubricant flowing out of the tail end of the steel pipe for recycling, so that energy conservation and environmental protection are realized, and the quality of the heat-expanded steel pipe is guaranteed.

Description

Technical Field

[0001] The utility model relates to a drying stand for heat-expanded seamless steel pipes. Background Art

[0002] In the existing hot expansion steel pipe production, in order to ensure that the wear on the mold during the hot expansion of the steel pipe is reduced and its friction coefficient is reduced, it is necessary to coat the inner wall of the steel pipe with graphite lubricant, and leave it on the collection stand for a period of time, waiting for the hot expansion machine to need raw materials before it can be removed for use. When the steel pipe is placed on the collection stand for a long time and the drying speed is slow, the graphite lubricant will flow and accumulate at the bottom of the pipe, affecting the lubrication effect. In severe cases, the product is prone to quality defects such as "pits" and "bulges", and it will also cause problems such as accelerated wear and aging of the mold. At present, many companies choose to work outdoors in order to dry the inner wall of the steel pipe as quickly as possible. The temperature of the steel pipe is increased by sunlight, air flow, and the steel pipe is continuously rolled by humans to make the lubricant adhere evenly, which is conducive to drying the inner wall of the steel pipe as quickly as possible. However, its working environment is poor, the labor intensity is high, and the excess lubricant in the pipe is not easy to recover. In case of rainy days, the operation is difficult, the drying effect is poor, and it is more likely to pollute the environment. Some companies also work indoors, which improves the working environment. However, due to limited space, short collection racks, stationary steel pipes, poor air circulation inside the steel pipes, and poor drying conditions, lubricant will flow and accumulate. The existing treatment after lubricant application is either in a poor environment, high labor intensity, uneven and wasteful adsorption of lubricants on the inner surface of the steel pipe, and uneven product quality or mold wear caused by lubricant flow and accumulation, which makes it very easy for products to have quality problems and accelerate mold wear. The Chinese utility model patent with application number 201420397561.4 discloses an environmentally friendly graphite spraying machine for the inner wall of steel pipes. The installation order on the ground from left to right is the main operating table, graphite powder storage and conveying mechanism, hydraulic station, graphite powder stirring and spraying vehicle, automatic upper and lower steel pipe mechanism, steel pipe rotating mechanism, and graphite powder mixed liquid collection and filtering mechanism. The graphite powder stirring and spraying vehicle is provided with a walking mechanism and a graphite powder stirring box. A spray gun extends from the right side of the graphite powder stirring box. The right side near the graphite powder storage and conveying mechanism is a steel pipe rotating mechanism and an automatic upper and lower steel pipe mechanism. The automatic upper and lower steel pipe mechanism and the steel pipe rotating mechanism are installed in parallel. This patent solves the problem of uniformly spraying graphite powder on the inner wall of the steel pipe and collecting excess graphite powder mixed liquid, but does not solve the problem of unevenness caused by the flow of graphite powder mixed liquid during the steel pipe drying process and the outflow of graphite powder mixed liquid during the drying process.

[0003] In addition, when hot expanding the steel pipe, the steel pipe is heated by a medium-frequency induction heating coil to expand its diameter. The steel pipe is rapidly heated to about 800°C in the induction coil. When the diameter expansion is completed in the coil, the heat energy of the steel pipe is gradually dissipated as the steel pipe cools, resulting in energy waste. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings, the utility model provides a drying stand for heat-expanded seamless steel pipes to solve the above-mentioned problems.

[0005] To achieve this purpose, the structure adopted by the utility model is: a hot-expanded seamless steel pipe drying stand, including a long lifting structure and a short lifting structure, the long lifting structure is connected to a driven steel pipe rotating roller group, the short lifting structure is connected to an active steel pipe rotating roller group, and multiple sets of horizontal platforms are also provided, a lubricant recovery tank is provided at the end of the steel pipe, the lubricant recovery tank is connected to a collection tank, an air blowing pipe is provided above the lubricant recovery tank, the air blowing pipe blows air into the steel pipe, the air blowing pipe is connected to a heat recovery structure, the heat recovery structure includes a hot air suction hood, and the hot air suction hood is provided above the heating coil.

[0006] The long lifting structure includes a long fixed support, a hydraulic lifting long oil cylinder, a long oil cylinder support, a long rotating support and a long rotating steel frame. One end of the long rotating steel frame is connected to a driven steel pipe rotating roller group, and the other end is connected to the long rotating support through an axis. The hydraulic lifting long oil cylinder is connected to the long oil cylinder support, and the piston rod of the hydraulic lifting long oil cylinder is connected to the center of the long rotating steel frame. When the piston rod of the hydraulic lifting long oil cylinder is retracted, one end of the long rotating steel frame connected to the driven steel pipe rotating roller group is placed on the long fixed support.

[0007] The short lifting structure includes a short fixed support, a hydraulic lifting short oil cylinder, a short oil cylinder support, a short rotating support and a short rotating steel frame. One end of the short rotating steel frame is connected to an active steel pipe rotating roller group, and the other end is connected to the short rotating support through an axis. The hydraulic lifting short oil cylinder is connected to the short oil cylinder support, and the piston rod of the hydraulic lifting short oil cylinder is connected to the center of the short rotating steel frame. When the piston rod of the hydraulic lifting short oil cylinder is retracted, one end of the short rotating steel frame connected to the active steel pipe rotating roller group is placed on the short fixed support.

[0008] The air blowing pipe is connected to the distributor through a first flexible pipe, the distributor is connected to the centrifugal fan through a pipeline, and the centrifugal fan is connected to the hot air suction hood through a second flexible pipe.

[0009] Its beneficial effects are: the structural design of the utility model is reasonable and ingenious. The heat energy generated by the heating coil during thermal expansion is recovered and sent to the steel pipe coated with graphite lubricant, thereby accelerating the drying of the inner wall of the steel pipe. The long lifting structure, the short lifting structure, and the horizontal platform frame provide support for the posture of the steel pipe at different stages. The lubricant recovery tank collects the graphite lubricant flowing out of the end of the steel pipe for recycling, thereby achieving energy saving and environmental protection and ensuring the quality of the thermal expansion steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0011] Figure 1 It is the front view of the utility model;

[0012] Figure 2 It is a front view of the utility model;

[0013] Figure 3 It is a rear view of the utility model;

[0014] Figure 4 This is the front view of the heat recovery structure. DETAILED DESCRIPTION

[0015] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0016] In the description of the utility model, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0017] In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components; the fixed connection can be welding or gluing. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0018] like Figure 1-Figure 4 The hot-expanded seamless steel pipe drying stand shown in the figure has an operating table 1, a hydraulic station 2, a long lifting structure, a short lifting structure, a lubricant recovery tank 19, a collection tank 20 and a heat recovery structure arranged on the ground 3 from front to back, and multiple groups of horizontal platforms 4 are arranged between the hydraulic station 2, the long lifting structure and the short lifting structure. The hydraulic station 2 provides hydraulic oil for the long lifting structure and the short lifting structure.

[0019] like Figure 2As shown, the long lifting structure includes a long fixed support 8, a hydraulic lifting long oil cylinder 9, a long oil cylinder support 10, a long rotating support 11 and a long rotating steel frame 6. One end of the long rotating steel frame 6 is connected to the driven steel pipe rotating roller group 7, and the other end is connected to the long rotating support 11 through an axis. The driven steel pipe roller group 7 includes a plurality of groups of driven rollers arranged in sequence on the long rotating steel frame 6. One end of the steel pipe 5 is mounted on the driven roller. The bottom of the hydraulic lifting long oil cylinder 9 is hinged on the long oil cylinder support 10. The piston rod of the hydraulic lifting long oil cylinder 9 is connected to the center of the long rotating steel frame 6. When the piston rod of the hydraulic lifting long oil cylinder 9 is retracted, one end of the long rotating steel frame 6 connected to the driven steel pipe rotating roller group 7 is placed on the long fixed support 8.

[0020] like Figure 3 As shown, the short lifting structure includes a short fixed support 15, a hydraulic lifting short oil cylinder 16, a short oil cylinder support 17, a short rotating support 18 and a short rotating steel frame 12. One end of the short rotating steel frame 12 is connected to the active steel pipe rotating roller group 13, and the other end is connected to the short rotating support 18 through an axis. The active steel pipe rotating roller group 13 includes a frequency modulation motor reducer 14, multiple groups of active rollers and a chain 27. The active rollers are arranged side by side, and the ends are meshed with the chain 27 through gears. The chain 27 is connected to the frequency modulation motor reducer 14 to drive the rotation of the active roller. The bottom of the hydraulic lifting short oil cylinder 16 is hinged on the short oil cylinder support 17, and the piston rod of the hydraulic lifting short oil cylinder 16 is connected to the center of the short rotating steel frame 12. When the piston rod of the hydraulic lifting short oil cylinder 16 is retracted, one end of the short rotating steel frame 12 connected to the active steel pipe rotating roller group 13 is placed on the short fixed support 15.

[0021] When the piston rods of the hydraulic lifting long cylinder 9 and the hydraulic lifting short cylinder 16 are retracted, the horizontal heights of the driven steel pipe rotating roller group 7 and the active steel pipe rotating roller group 13 are lower than the upper surface of the horizontal platform frame 4, and the steel pipe 5 is supported on the horizontal platform frame 4 to roll horizontally without being hindered. When the piston rods of the hydraulic lifting long cylinder 9 and the hydraulic lifting short cylinder 16 are extended, the steel pipe 5 is tilted and separated from the horizontal platform frame 4, and rotates under the drive of the active steel pipe rotating roller group 13, so that the graphite lubricant on the inner wall of the steel pipe 5 is evenly coated, and the excess graphite lubricant is convenient to flow out from the bottom. At the same time, the stepless speed regulation of the leveling motor reducer 14 can adapt to the use of steel pipes 5 of different diameters, and the speed is controlled by the operating table 1.

[0022] A lubricant recovery groove 19 is arranged at the rear of the short lifting structure. The lubricant recovery groove 19 is an inclined long strip groove body, which is located below the steel pipe 5. After the excess graphite lubricant flows out from the bottom of the inclined steel pipe 5, it flows into the collection tank 20 along the lubricant recovery groove 19. The graphite lubricant in the collection tank 20 can be reused after filtering, thereby reducing production costs and reducing waste emissions.

[0023] A plurality of groups of air blowing pipes 21 are arranged above the lubricant recovery tank 19, and the air outlets of the air blowing pipes 21 face the inner wall of the steel pipe 5. Each group of air blowing pipes 21 is connected to a distributor 23 through a first flexible pipe 22, and the distributor 23 is connected to a centrifugal fan 25 through a pipeline 24. The centrifugal fan 25 is connected to a heat recovery structure through a second flexible pipe 26. Figure 4 As shown, the heat recovery structure includes a heating coil 30, and a hot air suction hood 28 is arranged above the heating coil 30. When the heating coil 30 heats the hot expansion steel pipe 31, the hot air suction hood 28 above blows the hot air in the air into the steel pipe 5 coated with graphite lubricant through the centrifugal fan 25, thereby accelerating the drying of the inner wall of the steel pipe 5. A rotatable crossbar 29 is arranged on the top of the hot air suction hood 28, and the rotatable crossbar 29 is erected on the ground 3 through a column. The opening direction of the hot air suction hood 28 can be adjusted by rotating the rotatable crossbar 29.

[0024] The utility model can recycle the graphite lubricant on the premise of ensuring uniform coating and rapid drying of the graphite lubricant on the inner wall of the steel pipe, and at the same time recycle the waste heat generated by the hot expansion line to provide thermal energy for the drying operation, thereby achieving energy conservation and emission reduction and optimizing the industrial environment.

[0025] The above is based on the enlightenment of this utility model. Through the above description, relevant staff can make various changes and modifications without deviating from the technical idea of ​​this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A drying stand for hot-expanded seamless steel pipes, comprising a long lifting structure and a short lifting structure, characterized in that: The long lifting structure is connected to a driven steel pipe rotating roller group, the short lifting structure is connected to an active steel pipe rotating roller group, and there are also multiple sets of horizontal platform frames. A lubricant recovery tank is provided at the end of the steel pipe, the lubricant recovery tank is connected to a collection tank, and an air blowing pipe is provided above the lubricant recovery tank. The air blowing pipe blows air into the steel pipe, and the air blowing pipe is connected to a heat recovery structure. The heat recovery structure includes a hot air suction hood, and the hot air suction hood is provided above the heating coil.

2. The drying stand for hot-expanded seamless steel pipe according to claim 1, characterized in that: The long lifting structure includes a long fixed support, a hydraulic lifting long oil cylinder, a long oil cylinder support, a long rotating support and a long rotating steel frame. One end of the long rotating steel frame is connected to a driven steel pipe rotating roller group, and the other end is connected to the long rotating support through an axis. The hydraulic lifting long oil cylinder is connected to the long oil cylinder support, and the piston rod of the hydraulic lifting long oil cylinder is connected to the center of the long rotating steel frame. When the piston rod of the hydraulic lifting long oil cylinder is retracted, one end of the long rotating steel frame connected to the driven steel pipe rotating roller group is placed on the long fixed support.

3. The drying stand for hot-expanded seamless steel pipe according to claim 1, characterized in that: The short lifting structure includes a short fixed support, a hydraulic lifting short oil cylinder, a short oil cylinder support, a short rotating support and a short rotating steel frame. One end of the short rotating steel frame is connected to an active steel pipe rotating roller group, and the other end is connected to the short rotating support through an axis. The hydraulic lifting short oil cylinder is connected to the short oil cylinder support, and the piston rod of the hydraulic lifting short oil cylinder is connected to the center of the short rotating steel frame. When the piston rod of the hydraulic lifting short oil cylinder is retracted, one end of the short rotating steel frame connected to the active steel pipe rotating roller group is placed on the short fixed support.

4. The drying stand for hot-expanded seamless steel pipe according to claim 1, characterized in that: The air blowing pipe is connected to the distributor through a first flexible pipe, the distributor is connected to the centrifugal fan through a pipeline, and the centrifugal fan is connected to the hot air suction hood through a second flexible pipe.

Images