Hot-dip galvanizing device for hot-rolled ribbed steel bars

Abstract

The utility model provides a hot-dip galvanizing device for hot-rolled ribbed steel bars. The hot-dip galvanizing device comprises a galvanizing sealing cover, and a galvanizing bath, a zinc pot and a zinc liquid lifting mechanism which are arranged in the galvanizing sealing cover, zinc liquid is contained in the zinc pot, the galvanizing bath is horizontally arranged above the zinc pot in the length direction, a zinc liquid lifting mechanism capable of lifting the zinc liquid in the zinc pot and pouring the zinc liquid into the galvanizing bath is arranged on one side of the galvanizing bath, and a slag discharging mechanism used for removing zinc slag in the zinc liquid is further arranged on the opposite side of the zinc liquid lifting mechanism. The continuous zinc plating device can realize continuous zinc plating in an oxygen-free environment, is uniform in plating layer and free of zinc plating dead angles, can simultaneously realize simultaneous zinc plating of a plurality of ribbed steel bars, and is green and environment-friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of ribbed steel bars, in particular to a hot-dip galvanizing device for hot-rolled ribbed steel bars. Background Art

[0002] Hot-rolled ribbed steel bars, commonly known as threaded steel bars, have high strength, high toughness, and good seismic resistance. They are ideal products for high-rise buildings and are widely used in the field of building concrete. In order to increase the corrosion resistance of steel bars and improve the strength and life of reinforced concrete, hot-dip galvanizing is usually performed on the outside of hot-rolled ribbed steel bars. After hot-dip galvanizing, the surface of the steel bar is covered with a pure zinc layer in the form of complete physical protection. A Zn-Fe alloy layer is also formed between the pure zinc layer and the steel bar matrix, which isolates the steel bar matrix from the atmosphere, thereby protecting the steel bar matrix from corrosion.

[0003] During the galvanizing process, the ribbed steel bars need to be heated in advance before further coating. In an oxygen environment, high-temperature steel bars will inevitably undergo oxidation reactions to generate iron oxide scale, which in turn affects the bonding strength between the coating and the substrate; moreover, the existing galvanizing technology often cannot achieve continuous galvanizing of ribbed steel bars over 10m. Due to the presence of transverse ribs in the ribbed steel bars themselves, there are many connecting angles of the steel bars, which are prone to leakage and corrosion dead corners when immersed in zinc liquid. Therefore, how to solve the above problems has become a key to restricting the quality of galvanizing of ribbed steel bars. Utility Model Content

[0004] The utility model provides a hot-dip galvanizing device for hot-rolled ribbed steel bars in order to overcome the disadvantages of the prior art.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A hot-dip galvanizing device for hot-rolled ribbed steel bars comprises a galvanizing sealing cover, a galvanizing tank, a zinc pot and a zinc liquid lifting mechanism arranged in the galvanizing sealing cover; the zinc liquid is contained in the zinc pot, the galvanizing tank is horizontally arranged above the zinc pot along the length direction, a zinc liquid lifting mechanism is arranged on one side of the galvanizing tank, and the zinc liquid lifting mechanism can lift the zinc liquid in the zinc pot and pour it into the galvanizing tank, and a slag discharge mechanism for removing zinc slag in the zinc liquid is also arranged on the opposite side of the zinc liquid lifting mechanism.

[0007] A further improvement of the utility model is that the galvanized sealing cover is a positive pressure sealing cover filled with nitrogen.

[0008] The further improvement of the utility model lies in that: the zinc liquid lifting mechanism comprises a lifting wheel, a zinc bucket, a turning support block, and a lifting motor for driving the lifting mechanism to rotate; the lifting wheel is a circular wheel with a rotatable support, and a plurality of zinc buckets are connected to the lifting wheel along the circumference of the axis, and the zinc buckets can be immersed in the zinc pot as the lifting wheel rotates, and the zinc liquid is lifted to a high place for transfer; the lifting wheel is also provided with a turning support block for gradually tilting the zinc bucket transferred out of the zinc pot toward the side of the galvanizing tank.

[0009] A further improvement of the utility model is that a plurality of suspension beams are evenly distributed around the hoist wheel, the suspension beams are perpendicular to the wheel body of the hoist wheel and extend to one side of the galvanizing tank, the zinc bucket is hinged to the suspension beams through two cantilevers, and the zinc bucket and the cantilevers on both sides thereof are also hinged through hinge shafts.

[0010] A further improvement of the utility model is that the flip support block is fixedly arranged on the hoist wheel and does not rotate with the rotation of the hoist wheel. The flip support block is a fan-shaped wedge block with a central angle of 90° and an inclined top surface, and the inclination angle of the top inclined surface of the flip support block gradually decreases from bottom to top.

[0011] A further improvement of the utility model is that the slag discharge mechanism comprises a separation chamber and a steady flow chamber which are arranged side by side and connected at the bottom, the top of the separation chamber is open and corresponds to the dumping position of the zinc bucket of the elevator wheel, the top of the separation chamber is provided with a zinc slag discharge port which is connected to the zinc slag discharge trough, and the bottom of the steady flow chamber is connected to the galvanizing trough.

[0012] The beneficial effects of the utility model are:

[0013] The utility model provides a hot-dip galvanizing device for hot-rolled ribbed steel bars. In an oxygen-free environment, a rotating lifting wheel is used to continuously lift the zinc liquid to a high place and continuously transfer it to the galvanizing tank, so that the zinc liquid accumulates in the galvanizing tank. When the high-temperature hot-rolled ribbed steel bars pass through the galvanizing tank filled with zinc liquid, the coating of the steel bar surface can be completed without leaving a galvanizing dead corner. The galvanizing process is continuous, and multiple ribbed steel bars can be galvanized at the same time; moreover, according to the actual requirements of the thickness of the zinc layer on the steel bar surface, one or more zinc liquid lifting mechanisms can be selected for operation, and a multi-layer coating method can be used to achieve the purpose of a thicker coating. Compared with direct coating of a thicker coating, the coating after multiple layers of coating has better density and bonding strength with the substrate.

[0014] The utility model adopts nitrogen atmosphere as the galvanizing protective atmosphere, which effectively isolates oxygen and avoids oxidation, and does not react with the high-temperature hot-rolled ribbed steel bars, thereby ensuring the cleanliness of the surface of the hot-rolled ribbed steel bars and the bonding firmness of the coating.

[0015] The utility model is also provided with two types of heating mechanisms, one is an auxiliary heater on the zinc pot, which can effectively ensure the temperature and fluidity of the zinc liquid in the zinc pot, and the other is an electric heating mechanism arranged on the top of the galvanizing sealing tank, which can radiate and heat the zinc liquid flowing into the slag discharge mechanism, prevent the heat loss of the zinc liquid, reduce the zinc slag ratio, and maintain good fluidity of the zinc liquid in the galvanizing tank. Generally speaking, the auxiliary heater and the electric heating mechanism are both arranged in multiple groups, the auxiliary heater is evenly distributed along the length direction of the zinc pot, the electric heating mechanism is arranged along the length direction of the galvanizing tank, and the motor heating mechanism is usually arranged in front of the zinc liquid lifting mechanism sealing cover, and connected through a reducer and a transmission shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a side view structural diagram of the zinc bucket of the utility model in a dumped state;

[0018] Figure 3 It is a structural schematic diagram of the slag discharge mechanism;

[0019] In the figure: 1. galvanized sealing cover, 1-1. nitrogen pipe, 1-2. electric heating mechanism, 2. galvanizing tank, 2-1. bell mouth, 3. zinc pot, 3-1. auxiliary heater, 3-2. liquid level window, 4-1. elevator wheel, 4-2. zinc bucket, 4-3. flip support block, 4-5. suspension beam, 4-6. cantilever, 5. slag discharge mechanism, 5-1. separation chamber, 5-2. steady flow chamber, 5-3. slag baffle, 5-4. zinc slag discharge port, 5-5. zinc slag discharge chute, 6. hot-rolled ribbed steel bars, 7. zinc liquid, 8. zinc slag. DETAILED DESCRIPTION

[0020] The utility model will be further described below in conjunction with the accompanying drawings.

[0021] A hot-dip galvanizing device for hot-rolled ribbed steel bars comprises a galvanizing sealing cover 1, a galvanizing tank 2, a zinc pot 3 and a zinc liquid lifting mechanism arranged in the galvanizing sealing cover 1.

[0022] The galvanized sealing cover 1 is filled with nitrogen and is positively pressurized, so that the galvanizing process is carried out in an oxygen-free environment. The two ends of the galvanized sealing cover 1 are respectively provided with an inlet and an outlet for the hot-rolled ribbed steel bars 6 to pass through. Nitrogen is introduced into the top of the galvanized sealing cover 1, and the nitrogen escapes from the inlet and the outlet of the galvanized sealing cover 1, ensuring that the interior of the galvanized sealing cover 1 is filled with nitrogen and presents an oxygen-free micro-positive pressure environment.

[0023] Specifically, before galvanizing, the air in the galvanizing sealed cover 1 needs to be replaced. Through one or more replacements, it is ensured that the air in the galvanizing sealed cover 1 has been completely replaced by nitrogen before the galvanizing operation is carried out.

[0024] An electric heating mechanism 1-2 is installed on the top of the galvanizing sealing tank, which can provide auxiliary heat during the galvanizing process to prevent the heat loss of the zinc liquid 7 and avoid the generation of zinc slag. The temperature of the zinc liquid 7 can be maintained between 450°C and 480°C, and it has good fluidity, and can be fully coated and film-formed on the surface of the hot-rolled ribbed steel bars 6.

[0025] The zinc pot 3 contains zinc liquid 7, and an auxiliary heater 3-1 is also provided on the zinc pot 3 to ensure the liquid state and good fluidity of the zinc liquid 7; the number of the auxiliary heaters 3-1 is determined according to the length of the zinc pot 3, and the auxiliary heaters 3-1 are usually arranged along the length direction of the zinc pot 3. The zinc pot 3 is also provided with a liquid level window 3-2 for checking the flow status of the zinc liquid 7 in the pot and the liquid level of the zinc liquid at any time, so as to replenish the zinc liquid 7 in time.

[0026] A galvanizing tank 2 is arranged parallel to the upper extension direction of the zinc pot 3, and the galvanizing tank 2 is a long tank with a horizontal channel inside; a zinc liquid lifting mechanism is arranged on one side of the galvanizing tank 2, which can lift the zinc liquid 7 in the zinc pot 3 and pour it into the galvanizing tank 2, and a slag discharge mechanism is arranged on the opposite side of the zinc liquid lifting mechanism to remove the zinc slag in the zinc liquid 7. A plurality of hot-rolled ribbed steel bars 6 enter the galvanizing tank 2 side by side, and as the hot-rolled ribbed steel bars 6 are transported forward, they contact the zinc liquid 7 in the galvanizing tank 2 and complete surface coating.

[0027] The length of the galvanizing tank 2 is smaller than that of the zinc pot 3 , so that the zinc liquid 7 flows out from the openings at both ends of the galvanizing tank 2 and directly falls into the zinc pot 3 .

[0028] The zinc liquid lifting mechanism comprises a lifting wheel 4-1, a zinc bucket 4-2, a tilting support block 4-3, and a lifting motor for driving the lifting mechanism to rotate. The lifting wheel 4-1 is a circular wheel with a rotary support, the power output shaft of the lifting motor is connected to the reducer, the power output shaft of the reducer is connected to the wheel core of the lifting wheel 4-1, and the lifting wheel 4-1 is driven by the power of the lifting motor to rotate; a supporting shaft balancer is also provided between the lifting motor and the wheel core of the lifting wheel 4-1 to ensure the constant and stable rotation of the lifting wheel 4-1.

[0029] It should be noted that, due to the high temperature of the zinc pot, in order to ensure the stable rotation of the hoisting wheel, the hoisting motor, reducer, and support shaft balancer are all arranged outside the galvanized sealing cover 1, and a cooling protection cover is arranged around them to prevent the hoisting motor from overheating.

[0030] A plurality of zinc buckets 4-2 are connected to the lifting wheel 4-1, and the zinc buckets 4-2 are evenly distributed along the axis of the lifting wheel 4-1. When the zinc buckets 4-2 rotate to fill the zinc pot 3 with zinc liquid 7, the zinc pot 3 is lifted to a high place. The lifting wheel 4-1 is also provided with a turning support block 4-3 for gradually tilting the zinc bucket 4-2 that has been transferred out of the zinc pot 3 toward the side of the galvanizing tank 2.

[0031] like Figure 2 As shown, the hoist wheel 4-1 is evenly distributed with a number of suspension beams 4-5, which are perpendicular to the wheel body of the hoist wheel 4-1 and extend to one side of the galvanizing tank 2. The zinc bucket 4-2 is hinged to the suspension beam 4-5 through two cantilevers 4-6, and the zinc bucket 4-2 and the cantilevers 4-6 on both sides are also hinged through hinge shafts; when the hoist wheel 4-1 rotates, the zinc bucket 4-2 rotates with the suspension beam 4-5 as the axis, so that the opening of the zinc bucket 4-2 is always facing upward.

[0032] A flip support block 4-3 is also provided on one side of the lifting wheel 4-1, which is used to gradually tilt the zinc bucket 4-2 during the upward lifting process until it tilts horizontally. The flip support block 4-3 is fixedly arranged on the lifting wheel 4-1 and does not rotate with the rotation of the lifting wheel 4-1. The flip support block 4-3 is usually arranged in the area between the zinc bucket 4-2 leaving the zinc pot 3 and the zinc bucket 4-2 being lifted to the highest point. Figure 1 , Figure 2 As shown, the flip support block 4-3 is a fan-shaped wedge block with a central angle of 90° and an inclined top surface. The inclination angle of the top inclined surface of the flip support block 4-3 gradually decreases from bottom to top, and the zinc bucket 4-2 contacts the top inclined surface of the flip support block 4-3; the bottom of the zinc bucket 4-2 is arc-shaped. When the zinc bucket 4-2 is lifted upward from the galvanizing tank 2, the bottom of the zinc bucket 4-2 contacts the flip support block 4-3 and is tilted along the hinge axis of the cantilever 4-6 by the upward thrust of the flip support block 4-3. With the rotation of the hoist wheel 4-1, the inclination angle of the zinc bucket 4-2 gradually increases until it reaches the top of the hoist wheel 4-1. The zinc bucket 4-2 is horizontal and pours the zinc liquid 7 into the galvanizing tank 2. Subsequently, the zinc bucket 4-2 continues to descend under the action of the hoist wheel 4-1, and the support effect with the flip support block 4-3 is released. The zinc bucket 4-2 is reset under the action of gravity, and the lifting and transfer of the zinc liquid 7 are repeated.

[0033] The other side of the galvanizing tank 2 is provided with a slag discharge mechanism 5 corresponding to the top of the lifting wheel 4-1. Figure 3As shown, the slag discharge mechanism 5 includes a separation chamber 5-1 and a steady flow chamber 5-2 arranged side by side and connected at the bottom, and a slag baffle plate 5-3 is used between the separation chamber 5-1 and the steady flow chamber 5-2 to adjust the height of the connection point. The top of the separation chamber 5-1 is open and corresponds to the zinc bucket 4-2 pouring position of the lifting machine wheel 4-1. The top of the separation chamber 5-1 is provided with a zinc slag discharge port 5-4 connected to the zinc slag discharge slot 5-3. The bottom of the steady flow chamber 5-2 is connected to the galvanizing tank 2. The zinc liquid in the zinc bucket 4-2 flows in from the top opening of the separation chamber 5-1. Under the action of gravity, the zinc slag 8 floats on the surface of the zinc liquid 7 and enters the zinc slag discharge slot 5-5 through the zinc slag discharge port 5-4. After being collected and purified, it is reused as the galvanizing liquid; the zinc liquid 7 enters the steady flow chamber 5-2 through the connection point and flows into the galvanizing tank 2 from the discharge port at the bottom of the steady flow chamber 5-2 to coat the multiple hot-rolled ribbed steel bars 6 passing therethrough. During the flow of zinc liquid, based on the principle of communicating vessels, the liquid level in the flow stabilization chamber 5-2 can be maintained at a certain height, and a stable flow of zinc liquid can be maintained during the pouring intervals of the zinc bucket 4-2, thereby ensuring the height of zinc liquid in the galvanizing tank 2 and the galvanizing effect of the ribbed steel bars.

[0034] A vertical slot is provided between the separation chamber 5-1 and the steady flow chamber 5-2, and the slag plate 5-3 is inserted into the slot, so that a flow channel of the zinc liquid is formed between the slag plate 5-3 and the bottom of the separation chamber 5-1. The slag plate 5-3 can be fixed to the top of the steady flow chamber 5-2 by pins. At this time, the slag plate 5-3 is a fixed slag plate, and the flow speed of the zinc liquid cannot be adjusted; the slag plate 5-3 can also be adjusted in position by a pneumatic adjustment cylinder. Specifically, a pneumatic adjustment cylinder is installed on the top of the galvanized sealing cover 1, and the front end of the pneumatic rod of the pneumatic adjustment cylinder is connected to the top of the slag plate. The height of the slag plate 5-3 is controlled by the extension and contraction of the pneumatic rod, thereby adjusting the height of the flow channel between the slag plate 5-3 and the bottom of the separation chamber 5-1.

[0035] Since the ribbed steel bars after hot rolling are arranged side by side and transported forward synchronously, in order to restrain and smooth the ribbed steel bars laterally, so that they can be transported smoothly and continuously and avoid steel piling, the inlet ends of the galvanizing tank 2 are connected to the bell mouth 2-1 with a large front and a small back, which is used to restrain and feed the multiple ribbed steel bars into the box laterally and transport them continuously.

[0036] During use, multiple sets of zinc liquid lifting mechanisms and slag discharge mechanisms can be set in sequence according to the required zinc coating thickness on the surface of the ribbed steel bar, for example Figure 1 The two groups shown in . The purpose of thicker coating is achieved by multi-layer coating. Compared with direct coating of thicker coating, the coating after multi-layer coating has better density and bonding strength with the substrate.

[0037] The working process of the utility model is:

[0038] The zinc bucket rotates continuously with the hoist wheel. The zinc bucket is immersed in the zinc pot to hold the zinc liquid. During the lifting process, it is gradually turned over by the overturning support block. When it reaches the top of the hoist wheel, the zinc bucket tilts to a horizontal level. The zinc liquid in the zinc bucket flows into the slag discharge mechanism. After the zinc slag is separated, the zinc liquid flows into the galvanizing tank to coat the hot-rolled ribbed steel bars passing through it. The excess zinc liquid flows into the zinc pot from both ends of the galvanizing tank.

[0039] The embodiments described above are merely descriptions of preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A hot-dip galvanizing device for hot-rolled ribbed steel bars, characterized in that The invention comprises a galvanizing sealing cover (1), a galvanizing tank (2), a zinc pot (3) and a zinc liquid lifting mechanism arranged in the galvanizing sealing cover (1); the zinc pot (3) contains zinc liquid (7); the galvanizing tank (2) is arranged horizontally above the zinc pot (3) along the length direction; a zinc liquid lifting mechanism is arranged on one side of the galvanizing tank (2) for lifting the zinc liquid (7) in the zinc pot (3) and pouring it into the galvanizing tank (2); and a slag discharge mechanism for removing zinc slag in the zinc liquid (7) is also arranged on the opposite side of the zinc liquid lifting mechanism.

2. A hot-dip galvanizing device for hot-rolled ribbed steel bars according to claim 1, characterized in that The galvanized sealing cover (1) is a positive pressure sealing cover filled with nitrogen.

3. The hot-dip galvanizing device for hot-rolled ribbed steel bars according to claim 1, characterized in that The zinc liquid lifting mechanism comprises a lifting wheel (4-1), a zinc bucket (4-2), a turning support block (4-3), and a lifting motor for driving the lifting mechanism to rotate; the lifting wheel (4-1) is a circular wheel supported in a rotating manner, and a plurality of zinc buckets (4-2) are connected to the lifting wheel (4-1) along the circumferential direction of the axis, and the zinc buckets (4-2) can be immersed in the zinc pot (3) as the lifting wheel (4-1) rotates, and the zinc liquid (7) is lifted to a high place for transfer; the lifting wheel (4-1) is also provided with a turning support block (4-3) for gradually tilting the zinc bucket (4-2) transferred out of the zinc pot (3) toward the side of the galvanizing tank (2).

4. A hot-dip galvanizing device for hot-rolled ribbed steel bars according to claim 3, characterized in that A plurality of suspension beams (4-5) are evenly distributed around the lifting wheel (4-1), the suspension beams (4-5) are perpendicular to the wheel body of the lifting wheel (4-1) and extend toward one side of the galvanizing tank (2), the zinc bucket (4-2) is hinged to the suspension beam (4-5) through two cantilevers (4-6), and the zinc bucket (4-2) and the cantilevers (4-6) on both sides thereof are also hinged through hinge shafts.

5. The hot-dip galvanizing device for hot-rolled ribbed steel bars according to claim 4, characterized in that The flip support block (4-3) is fixedly arranged on the hoist wheel (4-1) and does not rotate with the rotation of the hoist wheel (4-1). The flip support block (4-3) is a fan-shaped wedge block with a central angle of 90° and an inclined top surface, and the inclination angle of the top inclined surface of the flip support block (4-3) gradually decreases from bottom to top.

6. The hot-dip galvanizing device for hot-rolled ribbed steel bars according to claim 1, characterized in that The slag discharge mechanism (5) comprises a separation chamber (5-1) and a flow stabilization chamber (5-2) which are arranged side by side and connected at the bottom. The top of the separation chamber (5-1) is open and corresponds to the tipping position of the zinc bucket (4-2) of the lifting machine wheel (4-1). The top of the separation chamber (5-1) is provided with a zinc slag discharge port (5-4) which is connected to the zinc slag discharge trough (5-3). The bottom of the flow stabilization chamber (5-2) is connected to the galvanizing trough (2).

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