A heat treatment device for threaded steel

Abstract

The present invention relates to the technical field of threaded steel processing, and in particular to a threaded steel heat treatment device, wherein a groove is provided on a heating chamber, and two parallel spherical connectors are slidably connected to the groove, and one end of each spherical connector is fixedly connected to the same fixing ring, and a plurality of stirring blades are connected to the fixing ring at equal intervals along the axis direction, and the plurality of stirring blades cooperate with the heating chamber. The present invention introduces hot gas into the heating chamber to impact the stirring blades, so that the stirring blades rotate, and the stirring blades drive the fixing ring to rotate. After the stirring blades rotate, the hot gas in the heating chamber rotates, and the rotating hot gas continuously changes the heating direction of the threaded steel surface, so that the heat is more evenly transferred to the inside of the threaded steel, forming a more uniform temperature field, reducing the temperature gradient, making the heating effect inside the threaded steel uniform, and at the same time reducing the formation of an oxide layer, avoiding surface defects caused by the oxide layer.

Description

Technical Field

[0001] The invention relates to the technical field of threaded steel processing, and in particular to a threaded steel heat treatment device. Background Art

[0002] Rebar is the common name for hot-rolled ribbed steel bars. Rebar is a must-have steel for medium-sized and larger building components. The cross rib geometric shapes of rebar are mainly spiral, herringbone and crescent. The heat treatment of rebar is that the steel mill quenches and tempers the hot-rolled ribbed steel bars with high temperature. The heat-treated steel bars have high strength, save material, good anchorage and stable prestressing.

[0003] In the prior art, when performing heat treatment on rebar, the rebar is inserted into a heating chamber to increase the temperature in the heating chamber. The static hot gas contacts the rebar and then performs heat treatment on it. In static heat treatment, heat is mainly transferred from the surface to the inside by heat conduction. Due to the complex shape of the rebar (threads and ribs), local temperature differences are prone to occur during heat transfer. The temperature difference leads to uneven temperature field distribution, resulting in a large internal temperature gradient, which affects the quality of heat treatment. At the same time, the surface of the rebar is prone to decarburization due to oxidation, causing defects on the surface of the rebar. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art in static heat treatment, in which local temperature differences are prone to occur during the heat transfer process. The temperature differences lead to uneven temperature field distribution, resulting in a large internal temperature gradient, affecting the quality of heat treatment. At the same time, the surface of the threaded steel is prone to decarburization due to oxidation, resulting in defects on the surface of the threaded steel. A threaded steel heat treatment device is proposed to solve the shortcomings of the prior art in which local temperature differences are prone to occur during the heat transfer process. The temperature differences lead to uneven temperature field distribution, resulting in a large internal temperature gradient, affecting the quality of heat treatment.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A threaded steel heat treatment device is designed, comprising a base frame, the upper end of the base frame is fixedly connected to a shell, and a heating chamber is opened in the shell; It also includes a hot air rotating mechanism, which includes an electric heater, which is fixedly connected to the upper end of the base frame, the inlet end of the electric heater is connected to the outlet end of the blower through a second duct, and the outlet end of the electric heater is connected to the heating chamber through a second connecting pipe. The heating chamber is provided with a groove, and two parallel spherical connectors are slidably connected to the groove. One end of each of the spherical connectors is fixedly connected to the same fixing ring, and a plurality of stirring blades are connected to the fixing ring at equal intervals along the axial direction, and the plurality of stirring blades cooperate with the heating chamber.

[0006] Preferably, both ends of the shell are fixedly connected with rolling support members, and each of the rolling support members is located below the corresponding through hole.

[0007] Preferably, the outlet direction of the second connecting pipe is perpendicular to the side direction of the stirring blade.

[0008] Preferably, an air-sealed isolation mechanism for preventing flame splashing is fixedly connected to the base frame, and the air-sealed isolation mechanism includes a first mounting frame, the first mounting frame is fixedly connected to the base frame, a suction pump is fixedly connected to the first mounting frame, the inlet end of the suction pump is connected to the box body through a one-way tube, the first mounting frame is connected to a gas cylinder, the bottle mouth of the gas cylinder is connected to a third connecting pipe, one end of the third connecting pipe is connected to the upper end of the box body, and the third connecting pipe is connected to a solenoid valve.

[0009] Preferably, the upper end of the box is fixedly connected to a second mounting frame, the second mounting frame is fixedly connected to an electric telescopic rod, the upper end of the box is provided with a movable hole, an L-shaped plate is slidably connected to the movable hole, the telescopic end of the electric telescopic rod is fixedly connected to the L-shaped plate, the L-shaped plate divides the box into a first chamber and a second chamber, the first chamber is connected to the first conduit and the first connecting pipe, and the second chamber is connected to the third connecting pipe and the one-way pipe.

[0010] Preferably, the shell is connected to a heat energy utilization mechanism for utilizing heat in the exhaust gas, the heat energy utilization mechanism includes a fixed block, the fixed block is fixedly connected to the shell, a circular hole is provided on the fixed block, the circular hole is opposite to the through hole, an installation chamber is provided in the fixed block, an activated carbon filler layer is provided in the installation chamber, the outlet end of the suction pump is connected to a fourth connecting pipe, one end of the fourth connecting pipe is connected to the installation chamber, an air vent is provided at the upper end of the circular hole, the air vent is connected to the installation chamber, and a fixed net is connected to the air vent.

[0011] Preferably, a perforated plate is fixedly connected in the installation chamber, a buffer chamber is provided between the perforated plate and the upper end of the inner wall of the installation chamber, and the buffer chamber is connected to the fourth connecting pipe.

[0012] The invention provides a heat treatment device for threaded steel, which has the following beneficial effects: The hot gas introduced into the heating chamber impacts the stirring blades, causing the stirring blades to rotate, and the stirring blades drive the fixed ring to rotate. After the stirring blades rotate, the hot gas in the heating chamber rotates. The rotating hot gas continuously changes the heating direction of the surface of the rebar, so that the heat is more evenly transferred to the inside of the rebar, forming a more uniform temperature field, reducing the temperature gradient, making the heating effect inside the rebar uniform, and at the same time reducing the formation of the oxide layer, avoiding surface defects caused by the oxide layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of the structure of a threaded steel heat treatment device proposed by the present invention Figure 1 ; Figure 2 This is a schematic diagram of the structure of the connection between the fixing ring and the stirring blade in a threaded steel heat treatment device proposed by the present invention; Figure 3 for Figure 2 A schematic diagram of the local enlarged structure at A above; Figure 4 This is a schematic cross-sectional structure diagram of the connection between a fixing ring and a stirring blade in a threaded steel heat treatment device proposed by the present invention; Figure 5 A schematic diagram of the structure of a threaded steel heat treatment device proposed by the present invention Figure 2 ; Figure 6 A schematic diagram of the structure of the connection between the bottom frame and the gas sealing isolation mechanism in a threaded steel heat treatment device proposed by the present invention Figure 1 ; Figure 7 A schematic diagram of the structure of the connection between the bottom frame and the gas sealing isolation mechanism in a threaded steel heat treatment device proposed by the present invention Figure 2 ; Figure 8 This is a cross-sectional structural schematic diagram of the connection between the bottom frame and the gas sealing isolation mechanism in a threaded steel heat treatment device proposed by the present invention; Fig. 9 A schematic diagram of the structure of the connection between the shell and the heat energy utilization mechanism in a threaded steel heat treatment device proposed by the present invention Figure 1 ; Fig.10 A schematic diagram of the structure of the connection between the shell and the heat energy utilization mechanism in a threaded steel heat treatment device proposed by the present invention Figure 2 ; Fig.11 The present invention provides a cross-sectional structural diagram of the connection between a shell and a heat energy utilization mechanism in a threaded steel heat treatment device.

[0014] In the figure: 1. base frame; 2. shell; 3. heating chamber; 4. through hole; 5. rolling support; 6. blower; 7. box; 8. first connecting pipe; 9. electric heater; 10. second connecting pipe; 11. groove; 12. spherical connecting piece; 13. fixing ring; 14. stirring blade; 15. air sealing isolation mechanism; 16. heat energy utilization mechanism; 151. first mounting frame; 152. suction pump; 153. one-way pipe; 154. gas storage bottle; 155. third connecting pipe; 156. solenoid valve; 157. second mounting frame; 158. electric telescopic rod; 159. L-shaped plate; 161. fixing block; 162. circular hole; 163. mounting chamber; 164. activated carbon filler layer; 165. fourth connecting pipe; 166. fixing net; 167. perforated plate; 168. buffer chamber. DETAILED DESCRIPTION

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0016] Example 1: Reference Figure 1-4 A threaded steel heat treatment device comprises a base frame 1, a shell 2 is fixedly connected to the upper end of the base frame 1, a heating chamber 3 is opened in the shell 2, through holes 4 are opened at both ends of the shell 2, rolling support members 5 are fixedly connected to both ends of the shell 2, each rolling support member 5 is located below the corresponding through hole 4, a blower 6 is fixedly connected to the upper end of the base frame 1, a box 7 is fixedly connected to the upper end of the base frame 1, the inlet end of the blower 6 is connected to the box 7 through a first conduit, and the upper end of the box 7 is connected to the heating chamber 3 through a first connecting pipe 8; It also includes a hot air rotating mechanism, which includes an electric heater 9, which is fixedly connected to the upper end of the base frame 1, and the inlet end of the electric heater 9 is connected to the outlet end of the blower 6 through a second duct, and the outlet end of the electric heater 9 is connected to the heating chamber 3 through a second connecting pipe 10. A groove 11 is provided on the heating chamber 3, and two parallel spherical connectors 12 are slidably connected to the groove 11. One end of each spherical connector 12 is fixedly connected to the same fixing ring 13, and a plurality of stirring blades 14 are connected to the fixing ring 13 at equal intervals along the axial direction. The plurality of stirring blades 14 cooperate with the heating chamber 3, and the outlet direction of the second connecting pipe 10 is perpendicular to the side direction of the stirring blade 14.

[0017] Working principle: One end of the threaded steel bar passes through the through hole 4, the fixing ring 13 and the heating chamber 3 in sequence, and the threaded steel bar is in rolling contact with the upper ends of the two rolling supports 5. When the heat treatment is performed, the blower 6 is powered on and started to absorb the gas in the box 7 through the first conduit, and the absorbed gas is introduced into the electric heater 9 through the second conduit. The electric heater 9 heats the introduced gas, and the heated gas is introduced into the heating chamber 3 through the second connecting pipe 10. The hot gas in the heating chamber 3 is introduced into the box 7 through the second connecting pipe 10, and the hot gas circulates between the heating chamber 3, the box 7, the blower 6 and the electric heater 9; The hot gas introduced into the heating chamber 3 impacts the stirring blade 14, causing the stirring blade 14 to rotate, and the stirring blade 14 drives the fixing ring 13 to rotate, and the fixing ring 13 drives the spherical connector 12 to rotate on the groove 11, so that the stirring blade 14 rotates smoothly. After the stirring blade 14 rotates, the hot gas in the heating chamber 3 rotates, and the threaded steel is located in the middle position of the heating chamber 3. The rotating hot gas is in rotational contact with the surface of the threaded steel. The rotating hot gas continuously changes the heating direction of the surface of the threaded steel, so that the heat is more evenly transferred to the inside of the threaded steel, effectively reducing the phenomenon of local overheating or underheating, improving the heating uniformity, forming a more uniform temperature field, reducing the temperature gradient, and making the heating effect inside the threaded steel uniform. After the rotating hot gas contacts the surface of the threaded steel, the surface and inside of the threaded steel are heated more evenly. Uniform heating helps to refine the grains and form a more uniform microstructure. The fine grain structure can effectively hinder the expansion of cracks, thereby improving the strength and toughness of the threaded steel, while reducing the formation of an oxide layer and avoiding surface defects caused by the oxide layer.

[0018] Embodiment 2: After the stirring blade 14 rotates, the hot gas in the heating chamber 3 rotates. The rotating hot gas contacts the threaded steel. Impurities are attached to the surface of the threaded steel. The impurities are easy to burn under high temperature. When the threaded steel surface burns, the rotating hot gas drives the flame to rotate, which easily causes part of the flame to overflow from the through hole 4, thereby reducing the safety of the heat treatment of the threaded steel. Figure 5-8As another preferred embodiment of the present invention, the difference from the embodiment 1 is that the base frame 1 is fixedly connected with a gas sealing isolation mechanism 15 to prevent the flame from splashing, and the gas sealing isolation mechanism 15 includes a first mounting frame 151, the first mounting frame 151 is fixedly connected to the base frame 1, and the first mounting frame 151 is fixedly connected with a suction pump 152, and the inlet end of the suction pump 152 is connected to the box body 7 through a one-way pipe 153, and the first mounting frame 151 is connected with a gas cylinder 154, and the bottle mouth of the gas cylinder 154 is connected with a third connecting pipe 155, and one end of the third connecting pipe 155 is connected to the The third connecting pipe 155 leads to the upper end of the box body 7, and a solenoid valve 156 is connected to the third connecting pipe 155. The upper end of the box body 7 is fixedly connected to a second mounting bracket 157, and the second mounting bracket 157 is fixedly connected to an electric telescopic rod 158. A movable hole is provided at the upper end of the box body 7, and an L-shaped plate 159 is slidably connected to the movable hole. The telescopic end of the electric telescopic rod 158 is fixedly connected to the L-shaped plate 159. The L-shaped plate 159 divides the box body 7 into a first chamber and a second chamber. The first chamber is connected to the first conduit and the first connecting pipe 8, and the second chamber is connected to the third connecting pipe 155 and the one-way pipe 153.

[0019] Working principle: When the threaded steel is placed in the heating chamber 3 for heat treatment, the electric telescopic rod 158 is started and drives the L-shaped plate 159 to move downward by a set distance. After the L-shaped plate 159 moves downward by a set distance, the box body 7 is divided into a first chamber and a second chamber. After the suction pump 152 is started, the gas in the second chamber is unidirectionally sucked through the one-way tube 153, and the sucked gas is released into the air from the outlet end of the suction pump 152. The suction pump 152 stops working after sucking for a set time. After the gas in the second chamber is sucked, a negative pressure is generated. The solenoid valve 156 is opened, and the compressed nitrogen in the gas storage bottle 154 is introduced into the second chamber through the third connecting pipe 155. The solenoid valve 156 is closed after being opened for a set time. The nitrogen released by the third connecting pipe 155 fills the second chamber, so that the negative pressure in the second chamber gradually disappears. After the nitrogen fills the second chamber, the electric telescopic rod 158 drives the L-shaped plate 159 to move upward a set distance. After the L-shaped plate 159 moves upward a set distance, the first chamber is connected to the second chamber, and the nitrogen in the second chamber is mixed into the first chamber. At set intervals, the suction pump 152 unidirectionally absorbs the gas in the second chamber through the one-way tube 153, and then introduces the nitrogen into the second chamber through the third connecting pipe 155, gradually reducing the amount of oxygen in the gas in the box 7. The gas with more nitrogen is introduced into the heating chamber 3 through the first connecting pipe 8. When the rebar is heat-treated, nitrogen is continuously added to the gas. Since the gas in the box 7 contains more nitrogen, the rebar is not easy to burn under the protection of nitrogen when it is heat-treated, so that the flame will not overflow from the through hole 4, thereby improving the safety of the heat treatment of the rebar.

[0020] Embodiment 3: At set intervals, the suction pump 152 unidirectionally sucks the gas in the second chamber through the one-way tube 153, and the sucked gas is released into the air from the outlet of the suction pump 152. The gas released from the outlet of the suction pump 152 has a high temperature, which will cause a waste of heat energy when discharged into the air. When the hot gas is discharged into the air, the temperature of the working environment will be increased. At the same time, the released gas has a peculiar smell, and direct discharge will pollute the working environment. Figure 9-11 As another preferred embodiment of the present invention, the difference from Embodiment 2 is that a heat energy utilization mechanism 16 for utilizing heat in the exhaust gas is connected to the shell 2, and the heat energy utilization mechanism 16 includes a fixed block 161, which is fixedly connected to the shell 2, and a circular hole 162 is opened on the fixed block 161, and the circular hole 162 is directly opposite to the through hole 4. An installation chamber 163 is opened in the fixed block 161, and an activated carbon filler layer 164 is arranged in the installation chamber 163. The outlet end of the suction pump 152 is connected to a fourth connecting pipe 165, and one end of the fourth connecting pipe 165 is connected to the installation chamber 163. An air vent is opened at the upper end of the circular hole 162, and the air vent is connected to the installation chamber 163. A fixed net 166 is connected to the air vent, and a perforated plate 167 is fixedly connected to the installation chamber 163. A buffer chamber 168 is arranged between the perforated plate 167 and the upper end of the inner wall of the installation chamber 163, and the buffer chamber 168 is connected to the fourth connecting pipe 165.

[0021] Working principle: The gas released from the outlet end of the suction pump 152 is introduced into the buffer chamber 168 through the fourth connecting pipe 165. The buffer chamber 168 buffers the gas. As the gas continues to flow in, the pressure in the buffer chamber 168 gradually increases, so that the gas in the buffer chamber 168 passes through the perforated plate 167. The gas disperses through the perforated plate 167 and contacts with the activated carbon filler layer 164. The activated carbon filler layer 164 adsorbs the odor in the gas. The adsorbed gas passes through the fixed net 166 and enters the circular hole 162, and contacts with the rebar in the circular hole 162. The heat in the gas is transferred to the rebar, and the rebar is preheated. The temperature of the rebar increases and the temperature of the gas decreases. The cooled gas is released from both ends of the circular hole 162, and the odor in the gas is adsorbed by the activated carbon filler layer 164. The rebar absorbs the heat in the gas for preheating, so that the gas released from both ends of the circular hole 162 has less odor and lower temperature. When the gas is discharged into the working environment, it will not cause waste of heat energy, will not increase the temperature of the working environment, and will not pollute the working environment.

[0022] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A threaded steel heat treatment device, comprising a base frame (1), the upper end of the base frame (1) being fixedly connected to a shell (2), the shell (2) being provided with a heating chamber (3), characterized in that: in: The invention also comprises a hot air rotating mechanism, wherein the hot air rotating mechanism comprises an electric heater (9), the electric heater (9) is fixedly connected to the upper end of the base frame (1), the inlet end of the electric heater (9) is connected to the outlet end of the blower (6) through a second conduit, and the outlet end of the electric heater (9) is connected to the heating chamber (3) through a second connecting pipe (10), the heating chamber (3) is provided with a groove (11), two parallel spherical connecting members (12) are slidably connected to the groove (11), one end of each of the spherical connecting members (12) is fixedly connected to the same fixing ring (13), and a plurality of stirring blades (14) are connected to the fixing ring (13) at equal intervals along the axis direction, and the plurality of stirring blades (14) cooperate with the heating chamber (3).

2. The threaded steel heat treatment device according to claim 1, characterized in that: Both ends of the housing (2) are fixedly connected with rolling support members (5), and each rolling support member (5) is located below a corresponding through hole (4).

3. The threaded steel heat treatment device according to claim 1, characterized in that: The outlet direction of the second connecting pipe (10) is perpendicular to the side direction of the stirring blade (14).

4. The threaded steel heat treatment device according to claim 1, characterized in that: The base frame (1) is fixedly connected to a gas sealing isolation mechanism (15) for preventing flame splashing, the gas sealing isolation mechanism (15) comprising a first mounting frame (151), the first mounting frame (151) being fixedly connected to the base frame (1), the first mounting frame (151) being fixedly connected to a suction pump (152), the inlet end of the suction pump (152) being connected to the box body (7) via a one-way pipe (153), the first mounting frame (151) being connected to a gas cylinder (154), the bottle mouth of the gas cylinder (154) being connected to a third connecting pipe (155), one end of the third connecting pipe (155) being connected to an upper end of the box body (7), the third connecting pipe (155) being connected to a solenoid valve (156).

5. The threaded steel heat treatment device according to claim 4, characterized in that: The upper end of the box body (7) is fixedly connected to a second mounting frame (157), and the second mounting frame (157) is fixedly connected to an electric telescopic rod (158). The upper end of the box body (7) is provided with a movable hole, and an L-shaped plate (159) is slidably connected to the movable hole. The telescopic end of the electric telescopic rod (158) is fixedly connected to the L-shaped plate (159). The L-shaped plate (159) divides the box body (7) into a first chamber and a second chamber. The first chamber is connected to the first conduit and the first connecting pipe (8), and the second chamber is connected to the third connecting pipe (155) and the one-way pipe (153).

6. The threaded steel heat treatment device according to claim 5, characterized in that: The shell (2) is connected to a heat energy utilization mechanism (16) for utilizing heat in the exhaust gas. The heat energy utilization mechanism (16) comprises a fixed block (161). The fixed block (161) is fixedly connected to the shell (2). A circular hole (162) is provided on the fixed block (161). The circular hole (162) is directly opposite to the through hole (4). An installation chamber (163) is provided in the fixed block (161). An activated carbon filler layer (164) is provided in the installation chamber (163). The outlet end of the suction pump (152) is connected to a fourth connecting pipe (165). One end of the fourth connecting pipe (165) is connected to the installation chamber (163). An air vent is provided at the upper end of the circular hole (162). The air vent is connected to the installation chamber (163). A fixed net (166) is connected to the air vent.

7. The threaded steel heat treatment device according to claim 6, characterized in that: A perforated plate (167) is fixedly connected inside the installation chamber (163), a buffer chamber (168) is provided between the perforated plate (167) and the upper end of the inner wall of the installation chamber (163), and the buffer chamber (168) is connected to the fourth connecting pipe (165).

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